1 /* Xtensa-specific support for 32-bit ELF.
2 Copyright 2003, 2004, 2005, 2006, 2007, 2008 Free Software Foundation, Inc.
4 This file is part of BFD, the Binary File Descriptor library.
6 This program is free software; you can redistribute it and/or
7 modify it under the terms of the GNU General Public License as
8 published by the Free Software Foundation; either version 3 of the
9 License, or (at your option) any later version.
11 This program is distributed in the hope that it will be useful, but
12 WITHOUT ANY WARRANTY; without even the implied warranty of
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14 General Public License for more details.
16 You should have received a copy of the GNU General Public License
17 along with this program; if not, write to the Free Software
18 Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston, MA
30 #include "elf/xtensa.h"
31 #include "xtensa-isa.h"
32 #include "xtensa-config.h"
34 #define XTENSA_NO_NOP_REMOVAL 0
36 /* Local helper functions. */
38 static bfd_boolean add_extra_plt_sections (struct bfd_link_info *, int);
39 static char *vsprint_msg (const char *, const char *, int, ...) ATTRIBUTE_PRINTF(2,4);
40 static bfd_reloc_status_type bfd_elf_xtensa_reloc
41 (bfd *, arelent *, asymbol *, void *, asection *, bfd *, char **);
42 static bfd_boolean do_fix_for_relocatable_link
43 (Elf_Internal_Rela *, bfd *, asection *, bfd_byte *);
44 static void do_fix_for_final_link
45 (Elf_Internal_Rela *, bfd *, asection *, bfd_byte *, bfd_vma *);
47 /* Local functions to handle Xtensa configurability. */
49 static bfd_boolean is_indirect_call_opcode (xtensa_opcode);
50 static bfd_boolean is_direct_call_opcode (xtensa_opcode);
51 static bfd_boolean is_windowed_call_opcode (xtensa_opcode);
52 static xtensa_opcode get_const16_opcode (void);
53 static xtensa_opcode get_l32r_opcode (void);
54 static bfd_vma l32r_offset (bfd_vma, bfd_vma);
55 static int get_relocation_opnd (xtensa_opcode, int);
56 static int get_relocation_slot (int);
57 static xtensa_opcode get_relocation_opcode
58 (bfd *, asection *, bfd_byte *, Elf_Internal_Rela *);
59 static bfd_boolean is_l32r_relocation
60 (bfd *, asection *, bfd_byte *, Elf_Internal_Rela *);
61 static bfd_boolean is_alt_relocation (int);
62 static bfd_boolean is_operand_relocation (int);
63 static bfd_size_type insn_decode_len
64 (bfd_byte *, bfd_size_type, bfd_size_type);
65 static xtensa_opcode insn_decode_opcode
66 (bfd_byte *, bfd_size_type, bfd_size_type, int);
67 static bfd_boolean check_branch_target_aligned
68 (bfd_byte *, bfd_size_type, bfd_vma, bfd_vma);
69 static bfd_boolean check_loop_aligned
70 (bfd_byte *, bfd_size_type, bfd_vma, bfd_vma);
71 static bfd_boolean check_branch_target_aligned_address (bfd_vma, int);
72 static bfd_size_type get_asm_simplify_size
73 (bfd_byte *, bfd_size_type, bfd_size_type);
75 /* Functions for link-time code simplifications. */
77 static bfd_reloc_status_type elf_xtensa_do_asm_simplify
78 (bfd_byte *, bfd_vma, bfd_vma, char **);
79 static bfd_reloc_status_type contract_asm_expansion
80 (bfd_byte *, bfd_vma, Elf_Internal_Rela *, char **);
81 static xtensa_opcode swap_callx_for_call_opcode (xtensa_opcode);
82 static xtensa_opcode get_expanded_call_opcode (bfd_byte *, int, bfd_boolean *);
84 /* Access to internal relocations, section contents and symbols. */
86 static Elf_Internal_Rela *retrieve_internal_relocs
87 (bfd *, asection *, bfd_boolean);
88 static void pin_internal_relocs (asection *, Elf_Internal_Rela *);
89 static void release_internal_relocs (asection *, Elf_Internal_Rela *);
90 static bfd_byte *retrieve_contents (bfd *, asection *, bfd_boolean);
91 static void pin_contents (asection *, bfd_byte *);
92 static void release_contents (asection *, bfd_byte *);
93 static Elf_Internal_Sym *retrieve_local_syms (bfd *);
95 /* Miscellaneous utility functions. */
97 static asection *elf_xtensa_get_plt_section (struct bfd_link_info *, int);
98 static asection *elf_xtensa_get_gotplt_section (struct bfd_link_info *, int);
99 static asection *get_elf_r_symndx_section (bfd *, unsigned long);
100 static struct elf_link_hash_entry *get_elf_r_symndx_hash_entry
101 (bfd *, unsigned long);
102 static bfd_vma get_elf_r_symndx_offset (bfd *, unsigned long);
103 static bfd_boolean is_reloc_sym_weak (bfd *, Elf_Internal_Rela *);
104 static bfd_boolean pcrel_reloc_fits (xtensa_opcode, int, bfd_vma, bfd_vma);
105 static bfd_boolean xtensa_is_property_section (asection *);
106 static bfd_boolean xtensa_is_insntable_section (asection *);
107 static bfd_boolean xtensa_is_littable_section (asection *);
108 static bfd_boolean xtensa_is_proptable_section (asection *);
109 static int internal_reloc_compare (const void *, const void *);
110 static int internal_reloc_matches (const void *, const void *);
111 static asection *xtensa_get_property_section (asection *, const char *);
112 extern asection *xtensa_make_property_section (asection *, const char *);
113 static flagword xtensa_get_property_predef_flags (asection *);
115 /* Other functions called directly by the linker. */
117 typedef void (*deps_callback_t)
118 (asection *, bfd_vma, asection *, bfd_vma, void *);
119 extern bfd_boolean xtensa_callback_required_dependence
120 (bfd *, asection *, struct bfd_link_info *, deps_callback_t, void *);
123 /* Globally visible flag for choosing size optimization of NOP removal
124 instead of branch-target-aware minimization for NOP removal.
125 When nonzero, narrow all instructions and remove all NOPs possible
126 around longcall expansions. */
128 int elf32xtensa_size_opt;
131 /* The "new_section_hook" is used to set up a per-section
132 "xtensa_relax_info" data structure with additional information used
133 during relaxation. */
135 typedef struct xtensa_relax_info_struct xtensa_relax_info;
138 /* The GNU tools do not easily allow extending interfaces to pass around
139 the pointer to the Xtensa ISA information, so instead we add a global
140 variable here (in BFD) that can be used by any of the tools that need
143 xtensa_isa xtensa_default_isa;
146 /* When this is true, relocations may have been modified to refer to
147 symbols from other input files. The per-section list of "fix"
148 records needs to be checked when resolving relocations. */
150 static bfd_boolean relaxing_section = FALSE;
152 /* When this is true, during final links, literals that cannot be
153 coalesced and their relocations may be moved to other sections. */
155 int elf32xtensa_no_literal_movement = 1;
158 static reloc_howto_type elf_howto_table[] =
160 HOWTO (R_XTENSA_NONE, 0, 0, 0, FALSE, 0, complain_overflow_dont,
161 bfd_elf_xtensa_reloc, "R_XTENSA_NONE",
163 HOWTO (R_XTENSA_32, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
164 bfd_elf_xtensa_reloc, "R_XTENSA_32",
165 TRUE, 0xffffffff, 0xffffffff, FALSE),
167 /* Replace a 32-bit value with a value from the runtime linker (only
168 used by linker-generated stub functions). The r_addend value is
169 special: 1 means to substitute a pointer to the runtime linker's
170 dynamic resolver function; 2 means to substitute the link map for
171 the shared object. */
172 HOWTO (R_XTENSA_RTLD, 0, 2, 32, FALSE, 0, complain_overflow_dont,
173 NULL, "R_XTENSA_RTLD", FALSE, 0, 0, FALSE),
175 HOWTO (R_XTENSA_GLOB_DAT, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
176 bfd_elf_generic_reloc, "R_XTENSA_GLOB_DAT",
177 FALSE, 0, 0xffffffff, FALSE),
178 HOWTO (R_XTENSA_JMP_SLOT, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
179 bfd_elf_generic_reloc, "R_XTENSA_JMP_SLOT",
180 FALSE, 0, 0xffffffff, FALSE),
181 HOWTO (R_XTENSA_RELATIVE, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
182 bfd_elf_generic_reloc, "R_XTENSA_RELATIVE",
183 FALSE, 0, 0xffffffff, FALSE),
184 HOWTO (R_XTENSA_PLT, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
185 bfd_elf_xtensa_reloc, "R_XTENSA_PLT",
186 FALSE, 0, 0xffffffff, FALSE),
190 /* Old relocations for backward compatibility. */
191 HOWTO (R_XTENSA_OP0, 0, 0, 0, TRUE, 0, complain_overflow_dont,
192 bfd_elf_xtensa_reloc, "R_XTENSA_OP0", FALSE, 0, 0, TRUE),
193 HOWTO (R_XTENSA_OP1, 0, 0, 0, TRUE, 0, complain_overflow_dont,
194 bfd_elf_xtensa_reloc, "R_XTENSA_OP1", FALSE, 0, 0, TRUE),
195 HOWTO (R_XTENSA_OP2, 0, 0, 0, TRUE, 0, complain_overflow_dont,
196 bfd_elf_xtensa_reloc, "R_XTENSA_OP2", FALSE, 0, 0, TRUE),
198 /* Assembly auto-expansion. */
199 HOWTO (R_XTENSA_ASM_EXPAND, 0, 0, 0, TRUE, 0, complain_overflow_dont,
200 bfd_elf_xtensa_reloc, "R_XTENSA_ASM_EXPAND", FALSE, 0, 0, TRUE),
201 /* Relax assembly auto-expansion. */
202 HOWTO (R_XTENSA_ASM_SIMPLIFY, 0, 0, 0, TRUE, 0, complain_overflow_dont,
203 bfd_elf_xtensa_reloc, "R_XTENSA_ASM_SIMPLIFY", FALSE, 0, 0, TRUE),
207 HOWTO (R_XTENSA_32_PCREL, 0, 2, 32, TRUE, 0, complain_overflow_bitfield,
208 bfd_elf_xtensa_reloc, "R_XTENSA_32_PCREL",
209 FALSE, 0, 0xffffffff, TRUE),
211 /* GNU extension to record C++ vtable hierarchy. */
212 HOWTO (R_XTENSA_GNU_VTINHERIT, 0, 2, 0, FALSE, 0, complain_overflow_dont,
213 NULL, "R_XTENSA_GNU_VTINHERIT",
215 /* GNU extension to record C++ vtable member usage. */
216 HOWTO (R_XTENSA_GNU_VTENTRY, 0, 2, 0, FALSE, 0, complain_overflow_dont,
217 _bfd_elf_rel_vtable_reloc_fn, "R_XTENSA_GNU_VTENTRY",
220 /* Relocations for supporting difference of symbols. */
221 HOWTO (R_XTENSA_DIFF8, 0, 0, 8, FALSE, 0, complain_overflow_bitfield,
222 bfd_elf_xtensa_reloc, "R_XTENSA_DIFF8", FALSE, 0, 0xff, FALSE),
223 HOWTO (R_XTENSA_DIFF16, 0, 1, 16, FALSE, 0, complain_overflow_bitfield,
224 bfd_elf_xtensa_reloc, "R_XTENSA_DIFF16", FALSE, 0, 0xffff, FALSE),
225 HOWTO (R_XTENSA_DIFF32, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
226 bfd_elf_xtensa_reloc, "R_XTENSA_DIFF32", FALSE, 0, 0xffffffff, FALSE),
228 /* General immediate operand relocations. */
229 HOWTO (R_XTENSA_SLOT0_OP, 0, 0, 0, TRUE, 0, complain_overflow_dont,
230 bfd_elf_xtensa_reloc, "R_XTENSA_SLOT0_OP", FALSE, 0, 0, TRUE),
231 HOWTO (R_XTENSA_SLOT1_OP, 0, 0, 0, TRUE, 0, complain_overflow_dont,
232 bfd_elf_xtensa_reloc, "R_XTENSA_SLOT1_OP", FALSE, 0, 0, TRUE),
233 HOWTO (R_XTENSA_SLOT2_OP, 0, 0, 0, TRUE, 0, complain_overflow_dont,
234 bfd_elf_xtensa_reloc, "R_XTENSA_SLOT2_OP", FALSE, 0, 0, TRUE),
235 HOWTO (R_XTENSA_SLOT3_OP, 0, 0, 0, TRUE, 0, complain_overflow_dont,
236 bfd_elf_xtensa_reloc, "R_XTENSA_SLOT3_OP", FALSE, 0, 0, TRUE),
237 HOWTO (R_XTENSA_SLOT4_OP, 0, 0, 0, TRUE, 0, complain_overflow_dont,
238 bfd_elf_xtensa_reloc, "R_XTENSA_SLOT4_OP", FALSE, 0, 0, TRUE),
239 HOWTO (R_XTENSA_SLOT5_OP, 0, 0, 0, TRUE, 0, complain_overflow_dont,
240 bfd_elf_xtensa_reloc, "R_XTENSA_SLOT5_OP", FALSE, 0, 0, TRUE),
241 HOWTO (R_XTENSA_SLOT6_OP, 0, 0, 0, TRUE, 0, complain_overflow_dont,
242 bfd_elf_xtensa_reloc, "R_XTENSA_SLOT6_OP", FALSE, 0, 0, TRUE),
243 HOWTO (R_XTENSA_SLOT7_OP, 0, 0, 0, TRUE, 0, complain_overflow_dont,
244 bfd_elf_xtensa_reloc, "R_XTENSA_SLOT7_OP", FALSE, 0, 0, TRUE),
245 HOWTO (R_XTENSA_SLOT8_OP, 0, 0, 0, TRUE, 0, complain_overflow_dont,
246 bfd_elf_xtensa_reloc, "R_XTENSA_SLOT8_OP", FALSE, 0, 0, TRUE),
247 HOWTO (R_XTENSA_SLOT9_OP, 0, 0, 0, TRUE, 0, complain_overflow_dont,
248 bfd_elf_xtensa_reloc, "R_XTENSA_SLOT9_OP", FALSE, 0, 0, TRUE),
249 HOWTO (R_XTENSA_SLOT10_OP, 0, 0, 0, TRUE, 0, complain_overflow_dont,
250 bfd_elf_xtensa_reloc, "R_XTENSA_SLOT10_OP", FALSE, 0, 0, TRUE),
251 HOWTO (R_XTENSA_SLOT11_OP, 0, 0, 0, TRUE, 0, complain_overflow_dont,
252 bfd_elf_xtensa_reloc, "R_XTENSA_SLOT11_OP", FALSE, 0, 0, TRUE),
253 HOWTO (R_XTENSA_SLOT12_OP, 0, 0, 0, TRUE, 0, complain_overflow_dont,
254 bfd_elf_xtensa_reloc, "R_XTENSA_SLOT12_OP", FALSE, 0, 0, TRUE),
255 HOWTO (R_XTENSA_SLOT13_OP, 0, 0, 0, TRUE, 0, complain_overflow_dont,
256 bfd_elf_xtensa_reloc, "R_XTENSA_SLOT13_OP", FALSE, 0, 0, TRUE),
257 HOWTO (R_XTENSA_SLOT14_OP, 0, 0, 0, TRUE, 0, complain_overflow_dont,
258 bfd_elf_xtensa_reloc, "R_XTENSA_SLOT14_OP", FALSE, 0, 0, TRUE),
260 /* "Alternate" relocations. The meaning of these is opcode-specific. */
261 HOWTO (R_XTENSA_SLOT0_ALT, 0, 0, 0, TRUE, 0, complain_overflow_dont,
262 bfd_elf_xtensa_reloc, "R_XTENSA_SLOT0_ALT", FALSE, 0, 0, TRUE),
263 HOWTO (R_XTENSA_SLOT1_ALT, 0, 0, 0, TRUE, 0, complain_overflow_dont,
264 bfd_elf_xtensa_reloc, "R_XTENSA_SLOT1_ALT", FALSE, 0, 0, TRUE),
265 HOWTO (R_XTENSA_SLOT2_ALT, 0, 0, 0, TRUE, 0, complain_overflow_dont,
266 bfd_elf_xtensa_reloc, "R_XTENSA_SLOT2_ALT", FALSE, 0, 0, TRUE),
267 HOWTO (R_XTENSA_SLOT3_ALT, 0, 0, 0, TRUE, 0, complain_overflow_dont,
268 bfd_elf_xtensa_reloc, "R_XTENSA_SLOT3_ALT", FALSE, 0, 0, TRUE),
269 HOWTO (R_XTENSA_SLOT4_ALT, 0, 0, 0, TRUE, 0, complain_overflow_dont,
270 bfd_elf_xtensa_reloc, "R_XTENSA_SLOT4_ALT", FALSE, 0, 0, TRUE),
271 HOWTO (R_XTENSA_SLOT5_ALT, 0, 0, 0, TRUE, 0, complain_overflow_dont,
272 bfd_elf_xtensa_reloc, "R_XTENSA_SLOT5_ALT", FALSE, 0, 0, TRUE),
273 HOWTO (R_XTENSA_SLOT6_ALT, 0, 0, 0, TRUE, 0, complain_overflow_dont,
274 bfd_elf_xtensa_reloc, "R_XTENSA_SLOT6_ALT", FALSE, 0, 0, TRUE),
275 HOWTO (R_XTENSA_SLOT7_ALT, 0, 0, 0, TRUE, 0, complain_overflow_dont,
276 bfd_elf_xtensa_reloc, "R_XTENSA_SLOT7_ALT", FALSE, 0, 0, TRUE),
277 HOWTO (R_XTENSA_SLOT8_ALT, 0, 0, 0, TRUE, 0, complain_overflow_dont,
278 bfd_elf_xtensa_reloc, "R_XTENSA_SLOT8_ALT", FALSE, 0, 0, TRUE),
279 HOWTO (R_XTENSA_SLOT9_ALT, 0, 0, 0, TRUE, 0, complain_overflow_dont,
280 bfd_elf_xtensa_reloc, "R_XTENSA_SLOT9_ALT", FALSE, 0, 0, TRUE),
281 HOWTO (R_XTENSA_SLOT10_ALT, 0, 0, 0, TRUE, 0, complain_overflow_dont,
282 bfd_elf_xtensa_reloc, "R_XTENSA_SLOT10_ALT", FALSE, 0, 0, TRUE),
283 HOWTO (R_XTENSA_SLOT11_ALT, 0, 0, 0, TRUE, 0, complain_overflow_dont,
284 bfd_elf_xtensa_reloc, "R_XTENSA_SLOT11_ALT", FALSE, 0, 0, TRUE),
285 HOWTO (R_XTENSA_SLOT12_ALT, 0, 0, 0, TRUE, 0, complain_overflow_dont,
286 bfd_elf_xtensa_reloc, "R_XTENSA_SLOT12_ALT", FALSE, 0, 0, TRUE),
287 HOWTO (R_XTENSA_SLOT13_ALT, 0, 0, 0, TRUE, 0, complain_overflow_dont,
288 bfd_elf_xtensa_reloc, "R_XTENSA_SLOT13_ALT", FALSE, 0, 0, TRUE),
289 HOWTO (R_XTENSA_SLOT14_ALT, 0, 0, 0, TRUE, 0, complain_overflow_dont,
290 bfd_elf_xtensa_reloc, "R_XTENSA_SLOT14_ALT", FALSE, 0, 0, TRUE),
295 fprintf (stderr, "Xtensa bfd reloc lookup %d (%s)\n", code, str)
300 static reloc_howto_type *
301 elf_xtensa_reloc_type_lookup (bfd *abfd ATTRIBUTE_UNUSED,
302 bfd_reloc_code_real_type code)
307 TRACE ("BFD_RELOC_NONE");
308 return &elf_howto_table[(unsigned) R_XTENSA_NONE ];
311 TRACE ("BFD_RELOC_32");
312 return &elf_howto_table[(unsigned) R_XTENSA_32 ];
314 case BFD_RELOC_32_PCREL:
315 TRACE ("BFD_RELOC_32_PCREL");
316 return &elf_howto_table[(unsigned) R_XTENSA_32_PCREL ];
318 case BFD_RELOC_XTENSA_DIFF8:
319 TRACE ("BFD_RELOC_XTENSA_DIFF8");
320 return &elf_howto_table[(unsigned) R_XTENSA_DIFF8 ];
322 case BFD_RELOC_XTENSA_DIFF16:
323 TRACE ("BFD_RELOC_XTENSA_DIFF16");
324 return &elf_howto_table[(unsigned) R_XTENSA_DIFF16 ];
326 case BFD_RELOC_XTENSA_DIFF32:
327 TRACE ("BFD_RELOC_XTENSA_DIFF32");
328 return &elf_howto_table[(unsigned) R_XTENSA_DIFF32 ];
330 case BFD_RELOC_XTENSA_RTLD:
331 TRACE ("BFD_RELOC_XTENSA_RTLD");
332 return &elf_howto_table[(unsigned) R_XTENSA_RTLD ];
334 case BFD_RELOC_XTENSA_GLOB_DAT:
335 TRACE ("BFD_RELOC_XTENSA_GLOB_DAT");
336 return &elf_howto_table[(unsigned) R_XTENSA_GLOB_DAT ];
338 case BFD_RELOC_XTENSA_JMP_SLOT:
339 TRACE ("BFD_RELOC_XTENSA_JMP_SLOT");
340 return &elf_howto_table[(unsigned) R_XTENSA_JMP_SLOT ];
342 case BFD_RELOC_XTENSA_RELATIVE:
343 TRACE ("BFD_RELOC_XTENSA_RELATIVE");
344 return &elf_howto_table[(unsigned) R_XTENSA_RELATIVE ];
346 case BFD_RELOC_XTENSA_PLT:
347 TRACE ("BFD_RELOC_XTENSA_PLT");
348 return &elf_howto_table[(unsigned) R_XTENSA_PLT ];
350 case BFD_RELOC_XTENSA_OP0:
351 TRACE ("BFD_RELOC_XTENSA_OP0");
352 return &elf_howto_table[(unsigned) R_XTENSA_OP0 ];
354 case BFD_RELOC_XTENSA_OP1:
355 TRACE ("BFD_RELOC_XTENSA_OP1");
356 return &elf_howto_table[(unsigned) R_XTENSA_OP1 ];
358 case BFD_RELOC_XTENSA_OP2:
359 TRACE ("BFD_RELOC_XTENSA_OP2");
360 return &elf_howto_table[(unsigned) R_XTENSA_OP2 ];
362 case BFD_RELOC_XTENSA_ASM_EXPAND:
363 TRACE ("BFD_RELOC_XTENSA_ASM_EXPAND");
364 return &elf_howto_table[(unsigned) R_XTENSA_ASM_EXPAND ];
366 case BFD_RELOC_XTENSA_ASM_SIMPLIFY:
367 TRACE ("BFD_RELOC_XTENSA_ASM_SIMPLIFY");
368 return &elf_howto_table[(unsigned) R_XTENSA_ASM_SIMPLIFY ];
370 case BFD_RELOC_VTABLE_INHERIT:
371 TRACE ("BFD_RELOC_VTABLE_INHERIT");
372 return &elf_howto_table[(unsigned) R_XTENSA_GNU_VTINHERIT ];
374 case BFD_RELOC_VTABLE_ENTRY:
375 TRACE ("BFD_RELOC_VTABLE_ENTRY");
376 return &elf_howto_table[(unsigned) R_XTENSA_GNU_VTENTRY ];
379 if (code >= BFD_RELOC_XTENSA_SLOT0_OP
380 && code <= BFD_RELOC_XTENSA_SLOT14_OP)
382 unsigned n = (R_XTENSA_SLOT0_OP +
383 (code - BFD_RELOC_XTENSA_SLOT0_OP));
384 return &elf_howto_table[n];
387 if (code >= BFD_RELOC_XTENSA_SLOT0_ALT
388 && code <= BFD_RELOC_XTENSA_SLOT14_ALT)
390 unsigned n = (R_XTENSA_SLOT0_ALT +
391 (code - BFD_RELOC_XTENSA_SLOT0_ALT));
392 return &elf_howto_table[n];
402 static reloc_howto_type *
403 elf_xtensa_reloc_name_lookup (bfd *abfd ATTRIBUTE_UNUSED,
408 for (i = 0; i < sizeof (elf_howto_table) / sizeof (elf_howto_table[0]); i++)
409 if (elf_howto_table[i].name != NULL
410 && strcasecmp (elf_howto_table[i].name, r_name) == 0)
411 return &elf_howto_table[i];
417 /* Given an ELF "rela" relocation, find the corresponding howto and record
418 it in the BFD internal arelent representation of the relocation. */
421 elf_xtensa_info_to_howto_rela (bfd *abfd ATTRIBUTE_UNUSED,
423 Elf_Internal_Rela *dst)
425 unsigned int r_type = ELF32_R_TYPE (dst->r_info);
427 BFD_ASSERT (r_type < (unsigned int) R_XTENSA_max);
428 cache_ptr->howto = &elf_howto_table[r_type];
432 /* Functions for the Xtensa ELF linker. */
434 /* The name of the dynamic interpreter. This is put in the .interp
437 #define ELF_DYNAMIC_INTERPRETER "/lib/ld.so"
439 /* The size in bytes of an entry in the procedure linkage table.
440 (This does _not_ include the space for the literals associated with
443 #define PLT_ENTRY_SIZE 16
445 /* For _really_ large PLTs, we may need to alternate between literals
446 and code to keep the literals within the 256K range of the L32R
447 instructions in the code. It's unlikely that anyone would ever need
448 such a big PLT, but an arbitrary limit on the PLT size would be bad.
449 Thus, we split the PLT into chunks. Since there's very little
450 overhead (2 extra literals) for each chunk, the chunk size is kept
451 small so that the code for handling multiple chunks get used and
452 tested regularly. With 254 entries, there are 1K of literals for
453 each chunk, and that seems like a nice round number. */
455 #define PLT_ENTRIES_PER_CHUNK 254
457 /* PLT entries are actually used as stub functions for lazy symbol
458 resolution. Once the symbol is resolved, the stub function is never
459 invoked. Note: the 32-byte frame size used here cannot be changed
460 without a corresponding change in the runtime linker. */
462 static const bfd_byte elf_xtensa_be_plt_entry[PLT_ENTRY_SIZE] =
464 0x6c, 0x10, 0x04, /* entry sp, 32 */
465 0x18, 0x00, 0x00, /* l32r a8, [got entry for rtld's resolver] */
466 0x1a, 0x00, 0x00, /* l32r a10, [got entry for rtld's link map] */
467 0x1b, 0x00, 0x00, /* l32r a11, [literal for reloc index] */
468 0x0a, 0x80, 0x00, /* jx a8 */
472 static const bfd_byte elf_xtensa_le_plt_entry[PLT_ENTRY_SIZE] =
474 0x36, 0x41, 0x00, /* entry sp, 32 */
475 0x81, 0x00, 0x00, /* l32r a8, [got entry for rtld's resolver] */
476 0xa1, 0x00, 0x00, /* l32r a10, [got entry for rtld's link map] */
477 0xb1, 0x00, 0x00, /* l32r a11, [literal for reloc index] */
478 0xa0, 0x08, 0x00, /* jx a8 */
482 /* Xtensa ELF linker hash table. */
484 struct elf_xtensa_link_hash_table
486 struct elf_link_hash_table elf;
488 /* Short-cuts to get to dynamic linker sections. */
495 asection *spltlittbl;
497 /* Total count of PLT relocations seen during check_relocs.
498 The actual PLT code must be split into multiple sections and all
499 the sections have to be created before size_dynamic_sections,
500 where we figure out the exact number of PLT entries that will be
501 needed. It is OK if this count is an overestimate, e.g., some
502 relocations may be removed by GC. */
506 /* Get the Xtensa ELF linker hash table from a link_info structure. */
508 #define elf_xtensa_hash_table(p) \
509 ((struct elf_xtensa_link_hash_table *) ((p)->hash))
511 /* Create an Xtensa ELF linker hash table. */
513 static struct bfd_link_hash_table *
514 elf_xtensa_link_hash_table_create (bfd *abfd)
516 struct elf_xtensa_link_hash_table *ret;
517 bfd_size_type amt = sizeof (struct elf_xtensa_link_hash_table);
519 ret = bfd_malloc (amt);
523 if (!_bfd_elf_link_hash_table_init (&ret->elf, abfd,
524 _bfd_elf_link_hash_newfunc,
525 sizeof (struct elf_link_hash_entry)))
537 ret->spltlittbl = NULL;
539 ret->plt_reloc_count = 0;
541 return &ret->elf.root;
544 static inline bfd_boolean
545 elf_xtensa_dynamic_symbol_p (struct elf_link_hash_entry *h,
546 struct bfd_link_info *info)
548 /* Check if we should do dynamic things to this symbol. The
549 "ignore_protected" argument need not be set, because Xtensa code
550 does not require special handling of STV_PROTECTED to make function
551 pointer comparisons work properly. The PLT addresses are never
552 used for function pointers. */
554 return _bfd_elf_dynamic_symbol_p (h, info, 0);
559 property_table_compare (const void *ap, const void *bp)
561 const property_table_entry *a = (const property_table_entry *) ap;
562 const property_table_entry *b = (const property_table_entry *) bp;
564 if (a->address == b->address)
566 if (a->size != b->size)
567 return (a->size - b->size);
569 if ((a->flags & XTENSA_PROP_ALIGN) != (b->flags & XTENSA_PROP_ALIGN))
570 return ((b->flags & XTENSA_PROP_ALIGN)
571 - (a->flags & XTENSA_PROP_ALIGN));
573 if ((a->flags & XTENSA_PROP_ALIGN)
574 && (GET_XTENSA_PROP_ALIGNMENT (a->flags)
575 != GET_XTENSA_PROP_ALIGNMENT (b->flags)))
576 return (GET_XTENSA_PROP_ALIGNMENT (a->flags)
577 - GET_XTENSA_PROP_ALIGNMENT (b->flags));
579 if ((a->flags & XTENSA_PROP_UNREACHABLE)
580 != (b->flags & XTENSA_PROP_UNREACHABLE))
581 return ((b->flags & XTENSA_PROP_UNREACHABLE)
582 - (a->flags & XTENSA_PROP_UNREACHABLE));
584 return (a->flags - b->flags);
587 return (a->address - b->address);
592 property_table_matches (const void *ap, const void *bp)
594 const property_table_entry *a = (const property_table_entry *) ap;
595 const property_table_entry *b = (const property_table_entry *) bp;
597 /* Check if one entry overlaps with the other. */
598 if ((b->address >= a->address && b->address < (a->address + a->size))
599 || (a->address >= b->address && a->address < (b->address + b->size)))
602 return (a->address - b->address);
606 /* Get the literal table or property table entries for the given
607 section. Sets TABLE_P and returns the number of entries. On
608 error, returns a negative value. */
611 xtensa_read_table_entries (bfd *abfd,
613 property_table_entry **table_p,
614 const char *sec_name,
615 bfd_boolean output_addr)
617 asection *table_section;
618 bfd_size_type table_size = 0;
619 bfd_byte *table_data;
620 property_table_entry *blocks;
621 int blk, block_count;
622 bfd_size_type num_records;
623 Elf_Internal_Rela *internal_relocs, *irel, *rel_end;
624 bfd_vma section_addr, off;
625 flagword predef_flags;
626 bfd_size_type table_entry_size, section_limit;
629 || !(section->flags & SEC_ALLOC)
630 || (section->flags & SEC_DEBUGGING))
636 table_section = xtensa_get_property_section (section, sec_name);
638 table_size = table_section->size;
646 predef_flags = xtensa_get_property_predef_flags (table_section);
647 table_entry_size = 12;
649 table_entry_size -= 4;
651 num_records = table_size / table_entry_size;
652 table_data = retrieve_contents (abfd, table_section, TRUE);
653 blocks = (property_table_entry *)
654 bfd_malloc (num_records * sizeof (property_table_entry));
658 section_addr = section->output_section->vma + section->output_offset;
660 section_addr = section->vma;
662 internal_relocs = retrieve_internal_relocs (abfd, table_section, TRUE);
663 if (internal_relocs && !table_section->reloc_done)
665 qsort (internal_relocs, table_section->reloc_count,
666 sizeof (Elf_Internal_Rela), internal_reloc_compare);
667 irel = internal_relocs;
672 section_limit = bfd_get_section_limit (abfd, section);
673 rel_end = internal_relocs + table_section->reloc_count;
675 for (off = 0; off < table_size; off += table_entry_size)
677 bfd_vma address = bfd_get_32 (abfd, table_data + off);
679 /* Skip any relocations before the current offset. This should help
680 avoid confusion caused by unexpected relocations for the preceding
683 (irel->r_offset < off
684 || (irel->r_offset == off
685 && ELF32_R_TYPE (irel->r_info) == R_XTENSA_NONE)))
692 if (irel && irel->r_offset == off)
695 unsigned long r_symndx = ELF32_R_SYM (irel->r_info);
696 BFD_ASSERT (ELF32_R_TYPE (irel->r_info) == R_XTENSA_32);
698 if (get_elf_r_symndx_section (abfd, r_symndx) != section)
701 sym_off = get_elf_r_symndx_offset (abfd, r_symndx);
702 BFD_ASSERT (sym_off == 0);
703 address += (section_addr + sym_off + irel->r_addend);
707 if (address < section_addr
708 || address >= section_addr + section_limit)
712 blocks[block_count].address = address;
713 blocks[block_count].size = bfd_get_32 (abfd, table_data + off + 4);
715 blocks[block_count].flags = predef_flags;
717 blocks[block_count].flags = bfd_get_32 (abfd, table_data + off + 8);
721 release_contents (table_section, table_data);
722 release_internal_relocs (table_section, internal_relocs);
726 /* Now sort them into address order for easy reference. */
727 qsort (blocks, block_count, sizeof (property_table_entry),
728 property_table_compare);
730 /* Check that the table contents are valid. Problems may occur,
731 for example, if an unrelocated object file is stripped. */
732 for (blk = 1; blk < block_count; blk++)
734 /* The only circumstance where two entries may legitimately
735 have the same address is when one of them is a zero-size
736 placeholder to mark a place where fill can be inserted.
737 The zero-size entry should come first. */
738 if (blocks[blk - 1].address == blocks[blk].address &&
739 blocks[blk - 1].size != 0)
741 (*_bfd_error_handler) (_("%B(%A): invalid property table"),
743 bfd_set_error (bfd_error_bad_value);
755 static property_table_entry *
756 elf_xtensa_find_property_entry (property_table_entry *property_table,
757 int property_table_size,
760 property_table_entry entry;
761 property_table_entry *rv;
763 if (property_table_size == 0)
766 entry.address = addr;
770 rv = bsearch (&entry, property_table, property_table_size,
771 sizeof (property_table_entry), property_table_matches);
777 elf_xtensa_in_literal_pool (property_table_entry *lit_table,
781 if (elf_xtensa_find_property_entry (lit_table, lit_table_size, addr))
788 /* Look through the relocs for a section during the first phase, and
789 calculate needed space in the dynamic reloc sections. */
792 elf_xtensa_check_relocs (bfd *abfd,
793 struct bfd_link_info *info,
795 const Elf_Internal_Rela *relocs)
797 struct elf_xtensa_link_hash_table *htab;
798 Elf_Internal_Shdr *symtab_hdr;
799 struct elf_link_hash_entry **sym_hashes;
800 const Elf_Internal_Rela *rel;
801 const Elf_Internal_Rela *rel_end;
803 if (info->relocatable)
806 htab = elf_xtensa_hash_table (info);
807 symtab_hdr = &elf_tdata (abfd)->symtab_hdr;
808 sym_hashes = elf_sym_hashes (abfd);
810 rel_end = relocs + sec->reloc_count;
811 for (rel = relocs; rel < rel_end; rel++)
814 unsigned long r_symndx;
815 struct elf_link_hash_entry *h;
817 r_symndx = ELF32_R_SYM (rel->r_info);
818 r_type = ELF32_R_TYPE (rel->r_info);
820 if (r_symndx >= NUM_SHDR_ENTRIES (symtab_hdr))
822 (*_bfd_error_handler) (_("%B: bad symbol index: %d"),
827 if (r_symndx < symtab_hdr->sh_info)
831 h = sym_hashes[r_symndx - symtab_hdr->sh_info];
832 while (h->root.type == bfd_link_hash_indirect
833 || h->root.type == bfd_link_hash_warning)
834 h = (struct elf_link_hash_entry *) h->root.u.i.link;
843 if ((sec->flags & SEC_ALLOC) != 0)
845 if (h->got.refcount <= 0)
848 h->got.refcount += 1;
853 /* If this relocation is against a local symbol, then it's
854 exactly the same as a normal local GOT entry. */
858 if ((sec->flags & SEC_ALLOC) != 0)
860 if (h->plt.refcount <= 0)
866 h->plt.refcount += 1;
868 /* Keep track of the total PLT relocation count even if we
869 don't yet know whether the dynamic sections will be
871 htab->plt_reloc_count += 1;
873 if (elf_hash_table (info)->dynamic_sections_created)
875 if (! add_extra_plt_sections (info, htab->plt_reloc_count))
882 if ((sec->flags & SEC_ALLOC) != 0)
884 bfd_signed_vma *local_got_refcounts;
886 /* This is a global offset table entry for a local symbol. */
887 local_got_refcounts = elf_local_got_refcounts (abfd);
888 if (local_got_refcounts == NULL)
892 size = symtab_hdr->sh_info;
893 size *= sizeof (bfd_signed_vma);
894 local_got_refcounts =
895 (bfd_signed_vma *) bfd_zalloc (abfd, size);
896 if (local_got_refcounts == NULL)
898 elf_local_got_refcounts (abfd) = local_got_refcounts;
900 local_got_refcounts[r_symndx] += 1;
904 case R_XTENSA_GNU_VTINHERIT:
905 /* This relocation describes the C++ object vtable hierarchy.
906 Reconstruct it for later use during GC. */
907 if (!bfd_elf_gc_record_vtinherit (abfd, sec, h, rel->r_offset))
911 case R_XTENSA_GNU_VTENTRY:
912 /* This relocation describes which C++ vtable entries are actually
913 used. Record for later use during GC. */
914 BFD_ASSERT (h != NULL);
916 && !bfd_elf_gc_record_vtentry (abfd, sec, h, rel->r_addend))
930 elf_xtensa_make_sym_local (struct bfd_link_info *info,
931 struct elf_link_hash_entry *h)
935 if (h->plt.refcount > 0)
937 /* For shared objects, there's no need for PLT entries for local
938 symbols (use RELATIVE relocs instead of JMP_SLOT relocs). */
939 if (h->got.refcount < 0)
941 h->got.refcount += h->plt.refcount;
947 /* Don't need any dynamic relocations at all. */
955 elf_xtensa_hide_symbol (struct bfd_link_info *info,
956 struct elf_link_hash_entry *h,
957 bfd_boolean force_local)
959 /* For a shared link, move the plt refcount to the got refcount to leave
960 space for RELATIVE relocs. */
961 elf_xtensa_make_sym_local (info, h);
963 _bfd_elf_link_hash_hide_symbol (info, h, force_local);
967 /* Return the section that should be marked against GC for a given
971 elf_xtensa_gc_mark_hook (asection *sec,
972 struct bfd_link_info *info,
973 Elf_Internal_Rela *rel,
974 struct elf_link_hash_entry *h,
975 Elf_Internal_Sym *sym)
977 /* Property sections are marked "KEEP" in the linker scripts, but they
978 should not cause other sections to be marked. (This approach relies
979 on elf_xtensa_discard_info to remove property table entries that
980 describe discarded sections. Alternatively, it might be more
981 efficient to avoid using "KEEP" in the linker scripts and instead use
982 the gc_mark_extra_sections hook to mark only the property sections
983 that describe marked sections. That alternative does not work well
984 with the current property table sections, which do not correspond
985 one-to-one with the sections they describe, but that should be fixed
987 if (xtensa_is_property_section (sec))
991 switch (ELF32_R_TYPE (rel->r_info))
993 case R_XTENSA_GNU_VTINHERIT:
994 case R_XTENSA_GNU_VTENTRY:
998 return _bfd_elf_gc_mark_hook (sec, info, rel, h, sym);
1002 /* Update the GOT & PLT entry reference counts
1003 for the section being removed. */
1006 elf_xtensa_gc_sweep_hook (bfd *abfd,
1007 struct bfd_link_info *info ATTRIBUTE_UNUSED,
1009 const Elf_Internal_Rela *relocs)
1011 Elf_Internal_Shdr *symtab_hdr;
1012 struct elf_link_hash_entry **sym_hashes;
1013 bfd_signed_vma *local_got_refcounts;
1014 const Elf_Internal_Rela *rel, *relend;
1016 if (info->relocatable)
1019 if ((sec->flags & SEC_ALLOC) == 0)
1022 symtab_hdr = &elf_tdata (abfd)->symtab_hdr;
1023 sym_hashes = elf_sym_hashes (abfd);
1024 local_got_refcounts = elf_local_got_refcounts (abfd);
1026 relend = relocs + sec->reloc_count;
1027 for (rel = relocs; rel < relend; rel++)
1029 unsigned long r_symndx;
1030 unsigned int r_type;
1031 struct elf_link_hash_entry *h = NULL;
1033 r_symndx = ELF32_R_SYM (rel->r_info);
1034 if (r_symndx >= symtab_hdr->sh_info)
1036 h = sym_hashes[r_symndx - symtab_hdr->sh_info];
1037 while (h->root.type == bfd_link_hash_indirect
1038 || h->root.type == bfd_link_hash_warning)
1039 h = (struct elf_link_hash_entry *) h->root.u.i.link;
1042 r_type = ELF32_R_TYPE (rel->r_info);
1048 if (h->got.refcount > 0)
1055 if (h->plt.refcount > 0)
1060 if (local_got_refcounts[r_symndx] > 0)
1061 local_got_refcounts[r_symndx] -= 1;
1073 /* Create all the dynamic sections. */
1076 elf_xtensa_create_dynamic_sections (bfd *dynobj, struct bfd_link_info *info)
1078 struct elf_xtensa_link_hash_table *htab;
1079 flagword flags, noalloc_flags;
1081 htab = elf_xtensa_hash_table (info);
1083 /* First do all the standard stuff. */
1084 if (! _bfd_elf_create_dynamic_sections (dynobj, info))
1086 htab->splt = bfd_get_section_by_name (dynobj, ".plt");
1087 htab->srelplt = bfd_get_section_by_name (dynobj, ".rela.plt");
1088 htab->sgot = bfd_get_section_by_name (dynobj, ".got");
1089 htab->sgotplt = bfd_get_section_by_name (dynobj, ".got.plt");
1091 /* Create any extra PLT sections in case check_relocs has already
1092 been called on all the non-dynamic input files. */
1093 if (! add_extra_plt_sections (info, htab->plt_reloc_count))
1096 noalloc_flags = (SEC_HAS_CONTENTS | SEC_IN_MEMORY
1097 | SEC_LINKER_CREATED | SEC_READONLY);
1098 flags = noalloc_flags | SEC_ALLOC | SEC_LOAD;
1100 /* Mark the ".got.plt" section READONLY. */
1101 if (htab->sgotplt == NULL
1102 || ! bfd_set_section_flags (dynobj, htab->sgotplt, flags))
1105 /* Create ".rela.got". */
1106 htab->srelgot = bfd_make_section_with_flags (dynobj, ".rela.got", flags);
1107 if (htab->srelgot == NULL
1108 || ! bfd_set_section_alignment (dynobj, htab->srelgot, 2))
1111 /* Create ".got.loc" (literal tables for use by dynamic linker). */
1112 htab->sgotloc = bfd_make_section_with_flags (dynobj, ".got.loc", flags);
1113 if (htab->sgotloc == NULL
1114 || ! bfd_set_section_alignment (dynobj, htab->sgotloc, 2))
1117 /* Create ".xt.lit.plt" (literal table for ".got.plt*"). */
1118 htab->spltlittbl = bfd_make_section_with_flags (dynobj, ".xt.lit.plt",
1120 if (htab->spltlittbl == NULL
1121 || ! bfd_set_section_alignment (dynobj, htab->spltlittbl, 2))
1129 add_extra_plt_sections (struct bfd_link_info *info, int count)
1131 bfd *dynobj = elf_hash_table (info)->dynobj;
1134 /* Iterate over all chunks except 0 which uses the standard ".plt" and
1135 ".got.plt" sections. */
1136 for (chunk = count / PLT_ENTRIES_PER_CHUNK; chunk > 0; chunk--)
1142 /* Stop when we find a section has already been created. */
1143 if (elf_xtensa_get_plt_section (info, chunk))
1146 flags = (SEC_ALLOC | SEC_LOAD | SEC_HAS_CONTENTS | SEC_IN_MEMORY
1147 | SEC_LINKER_CREATED | SEC_READONLY);
1149 sname = (char *) bfd_malloc (10);
1150 sprintf (sname, ".plt.%u", chunk);
1151 s = bfd_make_section_with_flags (dynobj, sname, flags | SEC_CODE);
1153 || ! bfd_set_section_alignment (dynobj, s, 2))
1156 sname = (char *) bfd_malloc (14);
1157 sprintf (sname, ".got.plt.%u", chunk);
1158 s = bfd_make_section_with_flags (dynobj, sname, flags);
1160 || ! bfd_set_section_alignment (dynobj, s, 2))
1168 /* Adjust a symbol defined by a dynamic object and referenced by a
1169 regular object. The current definition is in some section of the
1170 dynamic object, but we're not including those sections. We have to
1171 change the definition to something the rest of the link can
1175 elf_xtensa_adjust_dynamic_symbol (struct bfd_link_info *info ATTRIBUTE_UNUSED,
1176 struct elf_link_hash_entry *h)
1178 /* If this is a weak symbol, and there is a real definition, the
1179 processor independent code will have arranged for us to see the
1180 real definition first, and we can just use the same value. */
1183 BFD_ASSERT (h->u.weakdef->root.type == bfd_link_hash_defined
1184 || h->u.weakdef->root.type == bfd_link_hash_defweak);
1185 h->root.u.def.section = h->u.weakdef->root.u.def.section;
1186 h->root.u.def.value = h->u.weakdef->root.u.def.value;
1190 /* This is a reference to a symbol defined by a dynamic object. The
1191 reference must go through the GOT, so there's no need for COPY relocs,
1199 elf_xtensa_allocate_dynrelocs (struct elf_link_hash_entry *h, void *arg)
1201 struct bfd_link_info *info;
1202 struct elf_xtensa_link_hash_table *htab;
1203 bfd_boolean is_dynamic;
1205 if (h->root.type == bfd_link_hash_indirect)
1208 if (h->root.type == bfd_link_hash_warning)
1209 h = (struct elf_link_hash_entry *) h->root.u.i.link;
1211 info = (struct bfd_link_info *) arg;
1212 htab = elf_xtensa_hash_table (info);
1214 is_dynamic = elf_xtensa_dynamic_symbol_p (h, info);
1217 elf_xtensa_make_sym_local (info, h);
1219 if (h->plt.refcount > 0)
1220 htab->srelplt->size += (h->plt.refcount * sizeof (Elf32_External_Rela));
1222 if (h->got.refcount > 0)
1223 htab->srelgot->size += (h->got.refcount * sizeof (Elf32_External_Rela));
1230 elf_xtensa_allocate_local_got_size (struct bfd_link_info *info)
1232 struct elf_xtensa_link_hash_table *htab;
1235 htab = elf_xtensa_hash_table (info);
1237 for (i = info->input_bfds; i; i = i->link_next)
1239 bfd_signed_vma *local_got_refcounts;
1240 bfd_size_type j, cnt;
1241 Elf_Internal_Shdr *symtab_hdr;
1243 local_got_refcounts = elf_local_got_refcounts (i);
1244 if (!local_got_refcounts)
1247 symtab_hdr = &elf_tdata (i)->symtab_hdr;
1248 cnt = symtab_hdr->sh_info;
1250 for (j = 0; j < cnt; ++j)
1252 if (local_got_refcounts[j] > 0)
1253 htab->srelgot->size += (local_got_refcounts[j]
1254 * sizeof (Elf32_External_Rela));
1260 /* Set the sizes of the dynamic sections. */
1263 elf_xtensa_size_dynamic_sections (bfd *output_bfd ATTRIBUTE_UNUSED,
1264 struct bfd_link_info *info)
1266 struct elf_xtensa_link_hash_table *htab;
1268 asection *s, *srelplt, *splt, *sgotplt, *srelgot, *spltlittbl, *sgotloc;
1269 bfd_boolean relplt, relgot;
1270 int plt_entries, plt_chunks, chunk;
1275 htab = elf_xtensa_hash_table (info);
1276 dynobj = elf_hash_table (info)->dynobj;
1279 srelgot = htab->srelgot;
1280 srelplt = htab->srelplt;
1282 if (elf_hash_table (info)->dynamic_sections_created)
1284 BFD_ASSERT (htab->srelgot != NULL
1285 && htab->srelplt != NULL
1286 && htab->sgot != NULL
1287 && htab->spltlittbl != NULL
1288 && htab->sgotloc != NULL);
1290 /* Set the contents of the .interp section to the interpreter. */
1291 if (info->executable)
1293 s = bfd_get_section_by_name (dynobj, ".interp");
1296 s->size = sizeof ELF_DYNAMIC_INTERPRETER;
1297 s->contents = (unsigned char *) ELF_DYNAMIC_INTERPRETER;
1300 /* Allocate room for one word in ".got". */
1301 htab->sgot->size = 4;
1303 /* Allocate space in ".rela.got" for literals that reference global
1304 symbols and space in ".rela.plt" for literals that have PLT
1306 elf_link_hash_traverse (elf_hash_table (info),
1307 elf_xtensa_allocate_dynrelocs,
1310 /* If we are generating a shared object, we also need space in
1311 ".rela.got" for R_XTENSA_RELATIVE relocs for literals that
1312 reference local symbols. */
1314 elf_xtensa_allocate_local_got_size (info);
1316 /* Allocate space in ".plt" to match the size of ".rela.plt". For
1317 each PLT entry, we need the PLT code plus a 4-byte literal.
1318 For each chunk of ".plt", we also need two more 4-byte
1319 literals, two corresponding entries in ".rela.got", and an
1320 8-byte entry in ".xt.lit.plt". */
1321 spltlittbl = htab->spltlittbl;
1322 plt_entries = srelplt->size / sizeof (Elf32_External_Rela);
1324 (plt_entries + PLT_ENTRIES_PER_CHUNK - 1) / PLT_ENTRIES_PER_CHUNK;
1326 /* Iterate over all the PLT chunks, including any extra sections
1327 created earlier because the initial count of PLT relocations
1328 was an overestimate. */
1330 (splt = elf_xtensa_get_plt_section (info, chunk)) != NULL;
1335 sgotplt = elf_xtensa_get_gotplt_section (info, chunk);
1336 BFD_ASSERT (sgotplt != NULL);
1338 if (chunk < plt_chunks - 1)
1339 chunk_entries = PLT_ENTRIES_PER_CHUNK;
1340 else if (chunk == plt_chunks - 1)
1341 chunk_entries = plt_entries - (chunk * PLT_ENTRIES_PER_CHUNK);
1345 if (chunk_entries != 0)
1347 sgotplt->size = 4 * (chunk_entries + 2);
1348 splt->size = PLT_ENTRY_SIZE * chunk_entries;
1349 srelgot->size += 2 * sizeof (Elf32_External_Rela);
1350 spltlittbl->size += 8;
1359 /* Allocate space in ".got.loc" to match the total size of all the
1361 sgotloc = htab->sgotloc;
1362 sgotloc->size = spltlittbl->size;
1363 for (abfd = info->input_bfds; abfd != NULL; abfd = abfd->link_next)
1365 if (abfd->flags & DYNAMIC)
1367 for (s = abfd->sections; s != NULL; s = s->next)
1369 if (! elf_discarded_section (s)
1370 && xtensa_is_littable_section (s)
1372 sgotloc->size += s->size;
1377 /* Allocate memory for dynamic sections. */
1380 for (s = dynobj->sections; s != NULL; s = s->next)
1384 if ((s->flags & SEC_LINKER_CREATED) == 0)
1387 /* It's OK to base decisions on the section name, because none
1388 of the dynobj section names depend upon the input files. */
1389 name = bfd_get_section_name (dynobj, s);
1391 if (CONST_STRNEQ (name, ".rela"))
1395 if (strcmp (name, ".rela.plt") == 0)
1397 else if (strcmp (name, ".rela.got") == 0)
1400 /* We use the reloc_count field as a counter if we need
1401 to copy relocs into the output file. */
1405 else if (! CONST_STRNEQ (name, ".plt.")
1406 && ! CONST_STRNEQ (name, ".got.plt.")
1407 && strcmp (name, ".got") != 0
1408 && strcmp (name, ".plt") != 0
1409 && strcmp (name, ".got.plt") != 0
1410 && strcmp (name, ".xt.lit.plt") != 0
1411 && strcmp (name, ".got.loc") != 0)
1413 /* It's not one of our sections, so don't allocate space. */
1419 /* If we don't need this section, strip it from the output
1420 file. We must create the ".plt*" and ".got.plt*"
1421 sections in create_dynamic_sections and/or check_relocs
1422 based on a conservative estimate of the PLT relocation
1423 count, because the sections must be created before the
1424 linker maps input sections to output sections. The
1425 linker does that before size_dynamic_sections, where we
1426 compute the exact size of the PLT, so there may be more
1427 of these sections than are actually needed. */
1428 s->flags |= SEC_EXCLUDE;
1430 else if ((s->flags & SEC_HAS_CONTENTS) != 0)
1432 /* Allocate memory for the section contents. */
1433 s->contents = (bfd_byte *) bfd_zalloc (dynobj, s->size);
1434 if (s->contents == NULL)
1439 if (elf_hash_table (info)->dynamic_sections_created)
1441 /* Add the special XTENSA_RTLD relocations now. The offsets won't be
1442 known until finish_dynamic_sections, but we need to get the relocs
1443 in place before they are sorted. */
1444 for (chunk = 0; chunk < plt_chunks; chunk++)
1446 Elf_Internal_Rela irela;
1450 irela.r_info = ELF32_R_INFO (0, R_XTENSA_RTLD);
1453 loc = (srelgot->contents
1454 + srelgot->reloc_count * sizeof (Elf32_External_Rela));
1455 bfd_elf32_swap_reloca_out (output_bfd, &irela, loc);
1456 bfd_elf32_swap_reloca_out (output_bfd, &irela,
1457 loc + sizeof (Elf32_External_Rela));
1458 srelgot->reloc_count += 2;
1461 /* Add some entries to the .dynamic section. We fill in the
1462 values later, in elf_xtensa_finish_dynamic_sections, but we
1463 must add the entries now so that we get the correct size for
1464 the .dynamic section. The DT_DEBUG entry is filled in by the
1465 dynamic linker and used by the debugger. */
1466 #define add_dynamic_entry(TAG, VAL) \
1467 _bfd_elf_add_dynamic_entry (info, TAG, VAL)
1469 if (info->executable)
1471 if (!add_dynamic_entry (DT_DEBUG, 0))
1477 if (!add_dynamic_entry (DT_PLTRELSZ, 0)
1478 || !add_dynamic_entry (DT_PLTREL, DT_RELA)
1479 || !add_dynamic_entry (DT_JMPREL, 0))
1485 if (!add_dynamic_entry (DT_RELA, 0)
1486 || !add_dynamic_entry (DT_RELASZ, 0)
1487 || !add_dynamic_entry (DT_RELAENT, sizeof (Elf32_External_Rela)))
1491 if (!add_dynamic_entry (DT_PLTGOT, 0)
1492 || !add_dynamic_entry (DT_XTENSA_GOT_LOC_OFF, 0)
1493 || !add_dynamic_entry (DT_XTENSA_GOT_LOC_SZ, 0))
1496 #undef add_dynamic_entry
1502 /* Perform the specified relocation. The instruction at (contents + address)
1503 is modified to set one operand to represent the value in "relocation". The
1504 operand position is determined by the relocation type recorded in the
1507 #define CALL_SEGMENT_BITS (30)
1508 #define CALL_SEGMENT_SIZE (1 << CALL_SEGMENT_BITS)
1510 static bfd_reloc_status_type
1511 elf_xtensa_do_reloc (reloc_howto_type *howto,
1513 asection *input_section,
1517 bfd_boolean is_weak_undef,
1518 char **error_message)
1521 xtensa_opcode opcode;
1522 xtensa_isa isa = xtensa_default_isa;
1523 static xtensa_insnbuf ibuff = NULL;
1524 static xtensa_insnbuf sbuff = NULL;
1525 bfd_vma self_address;
1526 bfd_size_type input_size;
1532 ibuff = xtensa_insnbuf_alloc (isa);
1533 sbuff = xtensa_insnbuf_alloc (isa);
1536 input_size = bfd_get_section_limit (abfd, input_section);
1538 /* Calculate the PC address for this instruction. */
1539 self_address = (input_section->output_section->vma
1540 + input_section->output_offset
1543 switch (howto->type)
1546 case R_XTENSA_DIFF8:
1547 case R_XTENSA_DIFF16:
1548 case R_XTENSA_DIFF32:
1549 return bfd_reloc_ok;
1551 case R_XTENSA_ASM_EXPAND:
1554 /* Check for windowed CALL across a 1GB boundary. */
1555 xtensa_opcode opcode =
1556 get_expanded_call_opcode (contents + address,
1557 input_size - address, 0);
1558 if (is_windowed_call_opcode (opcode))
1560 if ((self_address >> CALL_SEGMENT_BITS)
1561 != (relocation >> CALL_SEGMENT_BITS))
1563 *error_message = "windowed longcall crosses 1GB boundary; "
1565 return bfd_reloc_dangerous;
1569 return bfd_reloc_ok;
1571 case R_XTENSA_ASM_SIMPLIFY:
1573 /* Convert the L32R/CALLX to CALL. */
1574 bfd_reloc_status_type retval =
1575 elf_xtensa_do_asm_simplify (contents, address, input_size,
1577 if (retval != bfd_reloc_ok)
1578 return bfd_reloc_dangerous;
1580 /* The CALL needs to be relocated. Continue below for that part. */
1583 howto = &elf_howto_table[(unsigned) R_XTENSA_SLOT0_OP ];
1591 x = bfd_get_32 (abfd, contents + address);
1593 bfd_put_32 (abfd, x, contents + address);
1595 return bfd_reloc_ok;
1597 case R_XTENSA_32_PCREL:
1598 bfd_put_32 (abfd, relocation - self_address, contents + address);
1599 return bfd_reloc_ok;
1602 /* Only instruction slot-specific relocations handled below.... */
1603 slot = get_relocation_slot (howto->type);
1604 if (slot == XTENSA_UNDEFINED)
1606 *error_message = "unexpected relocation";
1607 return bfd_reloc_dangerous;
1610 /* Read the instruction into a buffer and decode the opcode. */
1611 xtensa_insnbuf_from_chars (isa, ibuff, contents + address,
1612 input_size - address);
1613 fmt = xtensa_format_decode (isa, ibuff);
1614 if (fmt == XTENSA_UNDEFINED)
1616 *error_message = "cannot decode instruction format";
1617 return bfd_reloc_dangerous;
1620 xtensa_format_get_slot (isa, fmt, slot, ibuff, sbuff);
1622 opcode = xtensa_opcode_decode (isa, fmt, slot, sbuff);
1623 if (opcode == XTENSA_UNDEFINED)
1625 *error_message = "cannot decode instruction opcode";
1626 return bfd_reloc_dangerous;
1629 /* Check for opcode-specific "alternate" relocations. */
1630 if (is_alt_relocation (howto->type))
1632 if (opcode == get_l32r_opcode ())
1634 /* Handle the special-case of non-PC-relative L32R instructions. */
1635 bfd *output_bfd = input_section->output_section->owner;
1636 asection *lit4_sec = bfd_get_section_by_name (output_bfd, ".lit4");
1639 *error_message = "relocation references missing .lit4 section";
1640 return bfd_reloc_dangerous;
1642 self_address = ((lit4_sec->vma & ~0xfff)
1643 + 0x40000 - 3); /* -3 to compensate for do_reloc */
1644 newval = relocation;
1647 else if (opcode == get_const16_opcode ())
1649 /* ALT used for high 16 bits. */
1650 newval = relocation >> 16;
1655 /* No other "alternate" relocations currently defined. */
1656 *error_message = "unexpected relocation";
1657 return bfd_reloc_dangerous;
1660 else /* Not an "alternate" relocation.... */
1662 if (opcode == get_const16_opcode ())
1664 newval = relocation & 0xffff;
1669 /* ...normal PC-relative relocation.... */
1671 /* Determine which operand is being relocated. */
1672 opnd = get_relocation_opnd (opcode, howto->type);
1673 if (opnd == XTENSA_UNDEFINED)
1675 *error_message = "unexpected relocation";
1676 return bfd_reloc_dangerous;
1679 if (!howto->pc_relative)
1681 *error_message = "expected PC-relative relocation";
1682 return bfd_reloc_dangerous;
1685 newval = relocation;
1689 /* Apply the relocation. */
1690 if (xtensa_operand_do_reloc (isa, opcode, opnd, &newval, self_address)
1691 || xtensa_operand_encode (isa, opcode, opnd, &newval)
1692 || xtensa_operand_set_field (isa, opcode, opnd, fmt, slot,
1695 const char *opname = xtensa_opcode_name (isa, opcode);
1698 msg = "cannot encode";
1699 if (is_direct_call_opcode (opcode))
1701 if ((relocation & 0x3) != 0)
1702 msg = "misaligned call target";
1704 msg = "call target out of range";
1706 else if (opcode == get_l32r_opcode ())
1708 if ((relocation & 0x3) != 0)
1709 msg = "misaligned literal target";
1710 else if (is_alt_relocation (howto->type))
1711 msg = "literal target out of range (too many literals)";
1712 else if (self_address > relocation)
1713 msg = "literal target out of range (try using text-section-literals)";
1715 msg = "literal placed after use";
1718 *error_message = vsprint_msg (opname, ": %s", strlen (msg) + 2, msg);
1719 return bfd_reloc_dangerous;
1722 /* Check for calls across 1GB boundaries. */
1723 if (is_direct_call_opcode (opcode)
1724 && is_windowed_call_opcode (opcode))
1726 if ((self_address >> CALL_SEGMENT_BITS)
1727 != (relocation >> CALL_SEGMENT_BITS))
1730 "windowed call crosses 1GB boundary; return may fail";
1731 return bfd_reloc_dangerous;
1735 /* Write the modified instruction back out of the buffer. */
1736 xtensa_format_set_slot (isa, fmt, slot, ibuff, sbuff);
1737 xtensa_insnbuf_to_chars (isa, ibuff, contents + address,
1738 input_size - address);
1739 return bfd_reloc_ok;
1744 vsprint_msg (const char *origmsg, const char *fmt, int arglen, ...)
1746 /* To reduce the size of the memory leak,
1747 we only use a single message buffer. */
1748 static bfd_size_type alloc_size = 0;
1749 static char *message = NULL;
1750 bfd_size_type orig_len, len = 0;
1751 bfd_boolean is_append;
1753 VA_OPEN (ap, arglen);
1754 VA_FIXEDARG (ap, const char *, origmsg);
1756 is_append = (origmsg == message);
1758 orig_len = strlen (origmsg);
1759 len = orig_len + strlen (fmt) + arglen + 20;
1760 if (len > alloc_size)
1762 message = (char *) bfd_realloc_or_free (message, len);
1765 if (message != NULL)
1768 memcpy (message, origmsg, orig_len);
1769 vsprintf (message + orig_len, fmt, ap);
1776 /* This function is registered as the "special_function" in the
1777 Xtensa howto for handling simplify operations.
1778 bfd_perform_relocation / bfd_install_relocation use it to
1779 perform (install) the specified relocation. Since this replaces the code
1780 in bfd_perform_relocation, it is basically an Xtensa-specific,
1781 stripped-down version of bfd_perform_relocation. */
1783 static bfd_reloc_status_type
1784 bfd_elf_xtensa_reloc (bfd *abfd,
1785 arelent *reloc_entry,
1788 asection *input_section,
1790 char **error_message)
1793 bfd_reloc_status_type flag;
1794 bfd_size_type octets = reloc_entry->address * bfd_octets_per_byte (abfd);
1795 bfd_vma output_base = 0;
1796 reloc_howto_type *howto = reloc_entry->howto;
1797 asection *reloc_target_output_section;
1798 bfd_boolean is_weak_undef;
1800 if (!xtensa_default_isa)
1801 xtensa_default_isa = xtensa_isa_init (0, 0);
1803 /* ELF relocs are against symbols. If we are producing relocatable
1804 output, and the reloc is against an external symbol, the resulting
1805 reloc will also be against the same symbol. In such a case, we
1806 don't want to change anything about the way the reloc is handled,
1807 since it will all be done at final link time. This test is similar
1808 to what bfd_elf_generic_reloc does except that it lets relocs with
1809 howto->partial_inplace go through even if the addend is non-zero.
1810 (The real problem is that partial_inplace is set for XTENSA_32
1811 relocs to begin with, but that's a long story and there's little we
1812 can do about it now....) */
1814 if (output_bfd && (symbol->flags & BSF_SECTION_SYM) == 0)
1816 reloc_entry->address += input_section->output_offset;
1817 return bfd_reloc_ok;
1820 /* Is the address of the relocation really within the section? */
1821 if (reloc_entry->address > bfd_get_section_limit (abfd, input_section))
1822 return bfd_reloc_outofrange;
1824 /* Work out which section the relocation is targeted at and the
1825 initial relocation command value. */
1827 /* Get symbol value. (Common symbols are special.) */
1828 if (bfd_is_com_section (symbol->section))
1831 relocation = symbol->value;
1833 reloc_target_output_section = symbol->section->output_section;
1835 /* Convert input-section-relative symbol value to absolute. */
1836 if ((output_bfd && !howto->partial_inplace)
1837 || reloc_target_output_section == NULL)
1840 output_base = reloc_target_output_section->vma;
1842 relocation += output_base + symbol->section->output_offset;
1844 /* Add in supplied addend. */
1845 relocation += reloc_entry->addend;
1847 /* Here the variable relocation holds the final address of the
1848 symbol we are relocating against, plus any addend. */
1851 if (!howto->partial_inplace)
1853 /* This is a partial relocation, and we want to apply the relocation
1854 to the reloc entry rather than the raw data. Everything except
1855 relocations against section symbols has already been handled
1858 BFD_ASSERT (symbol->flags & BSF_SECTION_SYM);
1859 reloc_entry->addend = relocation;
1860 reloc_entry->address += input_section->output_offset;
1861 return bfd_reloc_ok;
1865 reloc_entry->address += input_section->output_offset;
1866 reloc_entry->addend = 0;
1870 is_weak_undef = (bfd_is_und_section (symbol->section)
1871 && (symbol->flags & BSF_WEAK) != 0);
1872 flag = elf_xtensa_do_reloc (howto, abfd, input_section, relocation,
1873 (bfd_byte *) data, (bfd_vma) octets,
1874 is_weak_undef, error_message);
1876 if (flag == bfd_reloc_dangerous)
1878 /* Add the symbol name to the error message. */
1879 if (! *error_message)
1880 *error_message = "";
1881 *error_message = vsprint_msg (*error_message, ": (%s + 0x%lx)",
1882 strlen (symbol->name) + 17,
1884 (unsigned long) reloc_entry->addend);
1891 /* Set up an entry in the procedure linkage table. */
1894 elf_xtensa_create_plt_entry (struct bfd_link_info *info,
1896 unsigned reloc_index)
1898 asection *splt, *sgotplt;
1899 bfd_vma plt_base, got_base;
1900 bfd_vma code_offset, lit_offset;
1903 chunk = reloc_index / PLT_ENTRIES_PER_CHUNK;
1904 splt = elf_xtensa_get_plt_section (info, chunk);
1905 sgotplt = elf_xtensa_get_gotplt_section (info, chunk);
1906 BFD_ASSERT (splt != NULL && sgotplt != NULL);
1908 plt_base = splt->output_section->vma + splt->output_offset;
1909 got_base = sgotplt->output_section->vma + sgotplt->output_offset;
1911 lit_offset = 8 + (reloc_index % PLT_ENTRIES_PER_CHUNK) * 4;
1912 code_offset = (reloc_index % PLT_ENTRIES_PER_CHUNK) * PLT_ENTRY_SIZE;
1914 /* Fill in the literal entry. This is the offset of the dynamic
1915 relocation entry. */
1916 bfd_put_32 (output_bfd, reloc_index * sizeof (Elf32_External_Rela),
1917 sgotplt->contents + lit_offset);
1919 /* Fill in the entry in the procedure linkage table. */
1920 memcpy (splt->contents + code_offset,
1921 (bfd_big_endian (output_bfd)
1922 ? elf_xtensa_be_plt_entry
1923 : elf_xtensa_le_plt_entry),
1925 bfd_put_16 (output_bfd, l32r_offset (got_base + 0,
1926 plt_base + code_offset + 3),
1927 splt->contents + code_offset + 4);
1928 bfd_put_16 (output_bfd, l32r_offset (got_base + 4,
1929 plt_base + code_offset + 6),
1930 splt->contents + code_offset + 7);
1931 bfd_put_16 (output_bfd, l32r_offset (got_base + lit_offset,
1932 plt_base + code_offset + 9),
1933 splt->contents + code_offset + 10);
1935 return plt_base + code_offset;
1939 /* Relocate an Xtensa ELF section. This is invoked by the linker for
1940 both relocatable and final links. */
1943 elf_xtensa_relocate_section (bfd *output_bfd,
1944 struct bfd_link_info *info,
1946 asection *input_section,
1948 Elf_Internal_Rela *relocs,
1949 Elf_Internal_Sym *local_syms,
1950 asection **local_sections)
1952 struct elf_xtensa_link_hash_table *htab;
1953 Elf_Internal_Shdr *symtab_hdr;
1954 Elf_Internal_Rela *rel;
1955 Elf_Internal_Rela *relend;
1956 struct elf_link_hash_entry **sym_hashes;
1957 property_table_entry *lit_table = 0;
1959 char *error_message = NULL;
1960 bfd_size_type input_size;
1962 if (!xtensa_default_isa)
1963 xtensa_default_isa = xtensa_isa_init (0, 0);
1965 htab = elf_xtensa_hash_table (info);
1966 symtab_hdr = &elf_tdata (input_bfd)->symtab_hdr;
1967 sym_hashes = elf_sym_hashes (input_bfd);
1969 if (elf_hash_table (info)->dynamic_sections_created)
1971 ltblsize = xtensa_read_table_entries (input_bfd, input_section,
1972 &lit_table, XTENSA_LIT_SEC_NAME,
1978 input_size = bfd_get_section_limit (input_bfd, input_section);
1981 relend = relocs + input_section->reloc_count;
1982 for (; rel < relend; rel++)
1985 reloc_howto_type *howto;
1986 unsigned long r_symndx;
1987 struct elf_link_hash_entry *h;
1988 Elf_Internal_Sym *sym;
1991 bfd_reloc_status_type r;
1992 bfd_boolean is_weak_undef;
1993 bfd_boolean unresolved_reloc;
1996 r_type = ELF32_R_TYPE (rel->r_info);
1997 if (r_type == (int) R_XTENSA_GNU_VTINHERIT
1998 || r_type == (int) R_XTENSA_GNU_VTENTRY)
2001 if (r_type < 0 || r_type >= (int) R_XTENSA_max)
2003 bfd_set_error (bfd_error_bad_value);
2006 howto = &elf_howto_table[r_type];
2008 r_symndx = ELF32_R_SYM (rel->r_info);
2013 is_weak_undef = FALSE;
2014 unresolved_reloc = FALSE;
2017 if (howto->partial_inplace && !info->relocatable)
2019 /* Because R_XTENSA_32 was made partial_inplace to fix some
2020 problems with DWARF info in partial links, there may be
2021 an addend stored in the contents. Take it out of there
2022 and move it back into the addend field of the reloc. */
2023 rel->r_addend += bfd_get_32 (input_bfd, contents + rel->r_offset);
2024 bfd_put_32 (input_bfd, 0, contents + rel->r_offset);
2027 if (r_symndx < symtab_hdr->sh_info)
2029 sym = local_syms + r_symndx;
2030 sec = local_sections[r_symndx];
2031 relocation = _bfd_elf_rela_local_sym (output_bfd, sym, &sec, rel);
2035 RELOC_FOR_GLOBAL_SYMBOL (info, input_bfd, input_section, rel,
2036 r_symndx, symtab_hdr, sym_hashes,
2038 unresolved_reloc, warned);
2041 && !unresolved_reloc
2042 && h->root.type == bfd_link_hash_undefweak)
2043 is_weak_undef = TRUE;
2046 if (sec != NULL && elf_discarded_section (sec))
2048 /* For relocs against symbols from removed linkonce sections,
2049 or sections discarded by a linker script, we just want the
2050 section contents zeroed. Avoid any special processing. */
2051 _bfd_clear_contents (howto, input_bfd, contents + rel->r_offset);
2057 if (info->relocatable)
2059 /* This is a relocatable link.
2060 1) If the reloc is against a section symbol, adjust
2061 according to the output section.
2062 2) If there is a new target for this relocation,
2063 the new target will be in the same output section.
2064 We adjust the relocation by the output section
2067 if (relaxing_section)
2069 /* Check if this references a section in another input file. */
2070 if (!do_fix_for_relocatable_link (rel, input_bfd, input_section,
2075 if (r_type == R_XTENSA_ASM_SIMPLIFY)
2077 char *error_message = NULL;
2078 /* Convert ASM_SIMPLIFY into the simpler relocation
2079 so that they never escape a relaxing link. */
2080 r = contract_asm_expansion (contents, input_size, rel,
2082 if (r != bfd_reloc_ok)
2084 if (!((*info->callbacks->reloc_dangerous)
2085 (info, error_message, input_bfd, input_section,
2089 r_type = ELF32_R_TYPE (rel->r_info);
2092 /* This is a relocatable link, so we don't have to change
2093 anything unless the reloc is against a section symbol,
2094 in which case we have to adjust according to where the
2095 section symbol winds up in the output section. */
2096 if (r_symndx < symtab_hdr->sh_info)
2098 sym = local_syms + r_symndx;
2099 if (ELF_ST_TYPE (sym->st_info) == STT_SECTION)
2101 sec = local_sections[r_symndx];
2102 rel->r_addend += sec->output_offset + sym->st_value;
2106 /* If there is an addend with a partial_inplace howto,
2107 then move the addend to the contents. This is a hack
2108 to work around problems with DWARF in relocatable links
2109 with some previous version of BFD. Now we can't easily get
2110 rid of the hack without breaking backward compatibility.... */
2113 howto = &elf_howto_table[r_type];
2114 if (howto->partial_inplace)
2116 r = elf_xtensa_do_reloc (howto, input_bfd, input_section,
2117 rel->r_addend, contents,
2118 rel->r_offset, FALSE,
2120 if (r != bfd_reloc_ok)
2122 if (!((*info->callbacks->reloc_dangerous)
2123 (info, error_message, input_bfd, input_section,
2131 /* Done with work for relocatable link; continue with next reloc. */
2135 /* This is a final link. */
2137 if (relaxing_section)
2139 /* Check if this references a section in another input file. */
2140 do_fix_for_final_link (rel, input_bfd, input_section, contents,
2144 /* Sanity check the address. */
2145 if (rel->r_offset >= input_size
2146 && ELF32_R_TYPE (rel->r_info) != R_XTENSA_NONE)
2148 (*_bfd_error_handler)
2149 (_("%B(%A+0x%lx): relocation offset out of range (size=0x%x)"),
2150 input_bfd, input_section, rel->r_offset, input_size);
2151 bfd_set_error (bfd_error_bad_value);
2155 /* Generate dynamic relocations. */
2156 if (elf_hash_table (info)->dynamic_sections_created)
2158 bfd_boolean dynamic_symbol = elf_xtensa_dynamic_symbol_p (h, info);
2160 if (dynamic_symbol && (is_operand_relocation (r_type)
2161 || r_type == R_XTENSA_32_PCREL))
2163 const char *name = h->root.root.string;
2165 vsprint_msg ("invalid relocation for dynamic symbol", ": %s",
2166 strlen (name) + 2, name);
2167 if (!((*info->callbacks->reloc_dangerous)
2168 (info, error_message, input_bfd, input_section,
2173 else if ((r_type == R_XTENSA_32 || r_type == R_XTENSA_PLT)
2174 && (input_section->flags & SEC_ALLOC) != 0
2175 && (dynamic_symbol || info->shared))
2177 Elf_Internal_Rela outrel;
2181 if (dynamic_symbol && r_type == R_XTENSA_PLT)
2182 srel = htab->srelplt;
2184 srel = htab->srelgot;
2186 BFD_ASSERT (srel != NULL);
2189 _bfd_elf_section_offset (output_bfd, info,
2190 input_section, rel->r_offset);
2192 if ((outrel.r_offset | 1) == (bfd_vma) -1)
2193 memset (&outrel, 0, sizeof outrel);
2196 outrel.r_offset += (input_section->output_section->vma
2197 + input_section->output_offset);
2199 /* Complain if the relocation is in a read-only section
2200 and not in a literal pool. */
2201 if ((input_section->flags & SEC_READONLY) != 0
2202 && !elf_xtensa_in_literal_pool (lit_table, ltblsize,
2206 _("dynamic relocation in read-only section");
2207 if (!((*info->callbacks->reloc_dangerous)
2208 (info, error_message, input_bfd, input_section,
2215 outrel.r_addend = rel->r_addend;
2218 if (r_type == R_XTENSA_32)
2221 ELF32_R_INFO (h->dynindx, R_XTENSA_GLOB_DAT);
2224 else /* r_type == R_XTENSA_PLT */
2227 ELF32_R_INFO (h->dynindx, R_XTENSA_JMP_SLOT);
2229 /* Create the PLT entry and set the initial
2230 contents of the literal entry to the address of
2233 elf_xtensa_create_plt_entry (info, output_bfd,
2236 unresolved_reloc = FALSE;
2240 /* Generate a RELATIVE relocation. */
2241 outrel.r_info = ELF32_R_INFO (0, R_XTENSA_RELATIVE);
2242 outrel.r_addend = 0;
2246 loc = (srel->contents
2247 + srel->reloc_count++ * sizeof (Elf32_External_Rela));
2248 bfd_elf32_swap_reloca_out (output_bfd, &outrel, loc);
2249 BFD_ASSERT (sizeof (Elf32_External_Rela) * srel->reloc_count
2252 else if (r_type == R_XTENSA_ASM_EXPAND && dynamic_symbol)
2254 /* This should only happen for non-PIC code, which is not
2255 supposed to be used on systems with dynamic linking.
2256 Just ignore these relocations. */
2261 /* Dynamic relocs are not propagated for SEC_DEBUGGING sections
2262 because such sections are not SEC_ALLOC and thus ld.so will
2263 not process them. */
2264 if (unresolved_reloc
2265 && !((input_section->flags & SEC_DEBUGGING) != 0
2268 (*_bfd_error_handler)
2269 (_("%B(%A+0x%lx): unresolvable %s relocation against symbol `%s'"),
2272 (long) rel->r_offset,
2274 h->root.root.string);
2278 /* There's no point in calling bfd_perform_relocation here.
2279 Just go directly to our "special function". */
2280 r = elf_xtensa_do_reloc (howto, input_bfd, input_section,
2281 relocation + rel->r_addend,
2282 contents, rel->r_offset, is_weak_undef,
2285 if (r != bfd_reloc_ok && !warned)
2289 BFD_ASSERT (r == bfd_reloc_dangerous || r == bfd_reloc_other);
2290 BFD_ASSERT (error_message != NULL);
2293 name = h->root.root.string;
2296 name = bfd_elf_string_from_elf_section
2297 (input_bfd, symtab_hdr->sh_link, sym->st_name);
2298 if (name && *name == '\0')
2299 name = bfd_section_name (input_bfd, sec);
2303 if (rel->r_addend == 0)
2304 error_message = vsprint_msg (error_message, ": %s",
2305 strlen (name) + 2, name);
2307 error_message = vsprint_msg (error_message, ": (%s+0x%x)",
2309 name, (int)rel->r_addend);
2312 if (!((*info->callbacks->reloc_dangerous)
2313 (info, error_message, input_bfd, input_section,
2322 input_section->reloc_done = TRUE;
2328 /* Finish up dynamic symbol handling. There's not much to do here since
2329 the PLT and GOT entries are all set up by relocate_section. */
2332 elf_xtensa_finish_dynamic_symbol (bfd *output_bfd ATTRIBUTE_UNUSED,
2333 struct bfd_link_info *info ATTRIBUTE_UNUSED,
2334 struct elf_link_hash_entry *h,
2335 Elf_Internal_Sym *sym)
2337 if (h->needs_plt && !h->def_regular)
2339 /* Mark the symbol as undefined, rather than as defined in
2340 the .plt section. Leave the value alone. */
2341 sym->st_shndx = SHN_UNDEF;
2342 /* If the symbol is weak, we do need to clear the value.
2343 Otherwise, the PLT entry would provide a definition for
2344 the symbol even if the symbol wasn't defined anywhere,
2345 and so the symbol would never be NULL. */
2346 if (!h->ref_regular_nonweak)
2350 /* Mark _DYNAMIC and _GLOBAL_OFFSET_TABLE_ as absolute. */
2351 if (strcmp (h->root.root.string, "_DYNAMIC") == 0
2352 || h == elf_hash_table (info)->hgot)
2353 sym->st_shndx = SHN_ABS;
2359 /* Combine adjacent literal table entries in the output. Adjacent
2360 entries within each input section may have been removed during
2361 relaxation, but we repeat the process here, even though it's too late
2362 to shrink the output section, because it's important to minimize the
2363 number of literal table entries to reduce the start-up work for the
2364 runtime linker. Returns the number of remaining table entries or -1
2368 elf_xtensa_combine_prop_entries (bfd *output_bfd,
2373 property_table_entry *table;
2374 bfd_size_type section_size, sgotloc_size;
2378 section_size = sxtlit->size;
2379 BFD_ASSERT (section_size % 8 == 0);
2380 num = section_size / 8;
2382 sgotloc_size = sgotloc->size;
2383 if (sgotloc_size != section_size)
2385 (*_bfd_error_handler)
2386 (_("internal inconsistency in size of .got.loc section"));
2390 table = bfd_malloc (num * sizeof (property_table_entry));
2394 /* The ".xt.lit.plt" section has the SEC_IN_MEMORY flag set and this
2395 propagates to the output section, where it doesn't really apply and
2396 where it breaks the following call to bfd_malloc_and_get_section. */
2397 sxtlit->flags &= ~SEC_IN_MEMORY;
2399 if (!bfd_malloc_and_get_section (output_bfd, sxtlit, &contents))
2407 /* There should never be any relocations left at this point, so this
2408 is quite a bit easier than what is done during relaxation. */
2410 /* Copy the raw contents into a property table array and sort it. */
2412 for (n = 0; n < num; n++)
2414 table[n].address = bfd_get_32 (output_bfd, &contents[offset]);
2415 table[n].size = bfd_get_32 (output_bfd, &contents[offset + 4]);
2418 qsort (table, num, sizeof (property_table_entry), property_table_compare);
2420 for (n = 0; n < num; n++)
2422 bfd_boolean remove = FALSE;
2424 if (table[n].size == 0)
2427 (table[n-1].address + table[n-1].size == table[n].address))
2429 table[n-1].size += table[n].size;
2435 for (m = n; m < num - 1; m++)
2437 table[m].address = table[m+1].address;
2438 table[m].size = table[m+1].size;
2446 /* Copy the data back to the raw contents. */
2448 for (n = 0; n < num; n++)
2450 bfd_put_32 (output_bfd, table[n].address, &contents[offset]);
2451 bfd_put_32 (output_bfd, table[n].size, &contents[offset + 4]);
2455 /* Clear the removed bytes. */
2456 if ((bfd_size_type) (num * 8) < section_size)
2457 memset (&contents[num * 8], 0, section_size - num * 8);
2459 if (! bfd_set_section_contents (output_bfd, sxtlit, contents, 0,
2463 /* Copy the contents to ".got.loc". */
2464 memcpy (sgotloc->contents, contents, section_size);
2472 /* Finish up the dynamic sections. */
2475 elf_xtensa_finish_dynamic_sections (bfd *output_bfd,
2476 struct bfd_link_info *info)
2478 struct elf_xtensa_link_hash_table *htab;
2480 asection *sdyn, *srelplt, *sgot, *sxtlit, *sgotloc;
2481 Elf32_External_Dyn *dyncon, *dynconend;
2482 int num_xtlit_entries = 0;
2484 if (! elf_hash_table (info)->dynamic_sections_created)
2487 htab = elf_xtensa_hash_table (info);
2488 dynobj = elf_hash_table (info)->dynobj;
2489 sdyn = bfd_get_section_by_name (dynobj, ".dynamic");
2490 BFD_ASSERT (sdyn != NULL);
2492 /* Set the first entry in the global offset table to the address of
2493 the dynamic section. */
2497 BFD_ASSERT (sgot->size == 4);
2499 bfd_put_32 (output_bfd, 0, sgot->contents);
2501 bfd_put_32 (output_bfd,
2502 sdyn->output_section->vma + sdyn->output_offset,
2506 srelplt = htab->srelplt;
2507 if (srelplt && srelplt->size != 0)
2509 asection *sgotplt, *srelgot, *spltlittbl;
2510 int chunk, plt_chunks, plt_entries;
2511 Elf_Internal_Rela irela;
2513 unsigned rtld_reloc;
2515 srelgot = htab->srelgot;
2516 spltlittbl = htab->spltlittbl;
2517 BFD_ASSERT (srelgot != NULL && spltlittbl != NULL);
2519 /* Find the first XTENSA_RTLD relocation. Presumably the rest
2520 of them follow immediately after.... */
2521 for (rtld_reloc = 0; rtld_reloc < srelgot->reloc_count; rtld_reloc++)
2523 loc = srelgot->contents + rtld_reloc * sizeof (Elf32_External_Rela);
2524 bfd_elf32_swap_reloca_in (output_bfd, loc, &irela);
2525 if (ELF32_R_TYPE (irela.r_info) == R_XTENSA_RTLD)
2528 BFD_ASSERT (rtld_reloc < srelgot->reloc_count);
2530 plt_entries = srelplt->size / sizeof (Elf32_External_Rela);
2532 (plt_entries + PLT_ENTRIES_PER_CHUNK - 1) / PLT_ENTRIES_PER_CHUNK;
2534 for (chunk = 0; chunk < plt_chunks; chunk++)
2536 int chunk_entries = 0;
2538 sgotplt = elf_xtensa_get_gotplt_section (info, chunk);
2539 BFD_ASSERT (sgotplt != NULL);
2541 /* Emit special RTLD relocations for the first two entries in
2542 each chunk of the .got.plt section. */
2544 loc = srelgot->contents + rtld_reloc * sizeof (Elf32_External_Rela);
2545 bfd_elf32_swap_reloca_in (output_bfd, loc, &irela);
2546 BFD_ASSERT (ELF32_R_TYPE (irela.r_info) == R_XTENSA_RTLD);
2547 irela.r_offset = (sgotplt->output_section->vma
2548 + sgotplt->output_offset);
2549 irela.r_addend = 1; /* tell rtld to set value to resolver function */
2550 bfd_elf32_swap_reloca_out (output_bfd, &irela, loc);
2552 BFD_ASSERT (rtld_reloc <= srelgot->reloc_count);
2554 /* Next literal immediately follows the first. */
2555 loc += sizeof (Elf32_External_Rela);
2556 bfd_elf32_swap_reloca_in (output_bfd, loc, &irela);
2557 BFD_ASSERT (ELF32_R_TYPE (irela.r_info) == R_XTENSA_RTLD);
2558 irela.r_offset = (sgotplt->output_section->vma
2559 + sgotplt->output_offset + 4);
2560 /* Tell rtld to set value to object's link map. */
2562 bfd_elf32_swap_reloca_out (output_bfd, &irela, loc);
2564 BFD_ASSERT (rtld_reloc <= srelgot->reloc_count);
2566 /* Fill in the literal table. */
2567 if (chunk < plt_chunks - 1)
2568 chunk_entries = PLT_ENTRIES_PER_CHUNK;
2570 chunk_entries = plt_entries - (chunk * PLT_ENTRIES_PER_CHUNK);
2572 BFD_ASSERT ((unsigned) (chunk + 1) * 8 <= spltlittbl->size);
2573 bfd_put_32 (output_bfd,
2574 sgotplt->output_section->vma + sgotplt->output_offset,
2575 spltlittbl->contents + (chunk * 8) + 0);
2576 bfd_put_32 (output_bfd,
2577 8 + (chunk_entries * 4),
2578 spltlittbl->contents + (chunk * 8) + 4);
2581 /* All the dynamic relocations have been emitted at this point.
2582 Make sure the relocation sections are the correct size. */
2583 if (srelgot->size != (sizeof (Elf32_External_Rela)
2584 * srelgot->reloc_count)
2585 || srelplt->size != (sizeof (Elf32_External_Rela)
2586 * srelplt->reloc_count))
2589 /* The .xt.lit.plt section has just been modified. This must
2590 happen before the code below which combines adjacent literal
2591 table entries, and the .xt.lit.plt contents have to be forced to
2593 if (! bfd_set_section_contents (output_bfd,
2594 spltlittbl->output_section,
2595 spltlittbl->contents,
2596 spltlittbl->output_offset,
2599 /* Clear SEC_HAS_CONTENTS so the contents won't be output again. */
2600 spltlittbl->flags &= ~SEC_HAS_CONTENTS;
2603 /* Combine adjacent literal table entries. */
2604 BFD_ASSERT (! info->relocatable);
2605 sxtlit = bfd_get_section_by_name (output_bfd, ".xt.lit");
2606 sgotloc = htab->sgotloc;
2607 BFD_ASSERT (sgotloc);
2611 elf_xtensa_combine_prop_entries (output_bfd, sxtlit, sgotloc);
2612 if (num_xtlit_entries < 0)
2616 dyncon = (Elf32_External_Dyn *) sdyn->contents;
2617 dynconend = (Elf32_External_Dyn *) (sdyn->contents + sdyn->size);
2618 for (; dyncon < dynconend; dyncon++)
2620 Elf_Internal_Dyn dyn;
2622 bfd_elf32_swap_dyn_in (dynobj, dyncon, &dyn);
2629 case DT_XTENSA_GOT_LOC_SZ:
2630 dyn.d_un.d_val = num_xtlit_entries;
2633 case DT_XTENSA_GOT_LOC_OFF:
2634 dyn.d_un.d_ptr = htab->sgotloc->output_section->vma;
2638 dyn.d_un.d_ptr = htab->sgot->output_section->vma;
2642 dyn.d_un.d_ptr = htab->srelplt->output_section->vma;
2646 dyn.d_un.d_val = htab->srelplt->output_section->size;
2650 /* Adjust RELASZ to not include JMPREL. This matches what
2651 glibc expects and what is done for several other ELF
2652 targets (e.g., i386, alpha), but the "correct" behavior
2653 seems to be unresolved. Since the linker script arranges
2654 for .rela.plt to follow all other relocation sections, we
2655 don't have to worry about changing the DT_RELA entry. */
2657 dyn.d_un.d_val -= htab->srelplt->output_section->size;
2661 bfd_elf32_swap_dyn_out (output_bfd, &dyn, dyncon);
2668 /* Functions for dealing with the e_flags field. */
2670 /* Merge backend specific data from an object file to the output
2671 object file when linking. */
2674 elf_xtensa_merge_private_bfd_data (bfd *ibfd, bfd *obfd)
2676 unsigned out_mach, in_mach;
2677 flagword out_flag, in_flag;
2679 /* Check if we have the same endianess. */
2680 if (!_bfd_generic_verify_endian_match (ibfd, obfd))
2683 /* Don't even pretend to support mixed-format linking. */
2684 if (bfd_get_flavour (ibfd) != bfd_target_elf_flavour
2685 || bfd_get_flavour (obfd) != bfd_target_elf_flavour)
2688 out_flag = elf_elfheader (obfd)->e_flags;
2689 in_flag = elf_elfheader (ibfd)->e_flags;
2691 out_mach = out_flag & EF_XTENSA_MACH;
2692 in_mach = in_flag & EF_XTENSA_MACH;
2693 if (out_mach != in_mach)
2695 (*_bfd_error_handler)
2696 (_("%B: incompatible machine type. Output is 0x%x. Input is 0x%x"),
2697 ibfd, out_mach, in_mach);
2698 bfd_set_error (bfd_error_wrong_format);
2702 if (! elf_flags_init (obfd))
2704 elf_flags_init (obfd) = TRUE;
2705 elf_elfheader (obfd)->e_flags = in_flag;
2707 if (bfd_get_arch (obfd) == bfd_get_arch (ibfd)
2708 && bfd_get_arch_info (obfd)->the_default)
2709 return bfd_set_arch_mach (obfd, bfd_get_arch (ibfd),
2710 bfd_get_mach (ibfd));
2715 if ((out_flag & EF_XTENSA_XT_INSN) != (in_flag & EF_XTENSA_XT_INSN))
2716 elf_elfheader (obfd)->e_flags &= (~ EF_XTENSA_XT_INSN);
2718 if ((out_flag & EF_XTENSA_XT_LIT) != (in_flag & EF_XTENSA_XT_LIT))
2719 elf_elfheader (obfd)->e_flags &= (~ EF_XTENSA_XT_LIT);
2726 elf_xtensa_set_private_flags (bfd *abfd, flagword flags)
2728 BFD_ASSERT (!elf_flags_init (abfd)
2729 || elf_elfheader (abfd)->e_flags == flags);
2731 elf_elfheader (abfd)->e_flags |= flags;
2732 elf_flags_init (abfd) = TRUE;
2739 elf_xtensa_print_private_bfd_data (bfd *abfd, void *farg)
2741 FILE *f = (FILE *) farg;
2742 flagword e_flags = elf_elfheader (abfd)->e_flags;
2744 fprintf (f, "\nXtensa header:\n");
2745 if ((e_flags & EF_XTENSA_MACH) == E_XTENSA_MACH)
2746 fprintf (f, "\nMachine = Base\n");
2748 fprintf (f, "\nMachine Id = 0x%x\n", e_flags & EF_XTENSA_MACH);
2750 fprintf (f, "Insn tables = %s\n",
2751 (e_flags & EF_XTENSA_XT_INSN) ? "true" : "false");
2753 fprintf (f, "Literal tables = %s\n",
2754 (e_flags & EF_XTENSA_XT_LIT) ? "true" : "false");
2756 return _bfd_elf_print_private_bfd_data (abfd, farg);
2760 /* Set the right machine number for an Xtensa ELF file. */
2763 elf_xtensa_object_p (bfd *abfd)
2766 unsigned long arch = elf_elfheader (abfd)->e_flags & EF_XTENSA_MACH;
2771 mach = bfd_mach_xtensa;
2777 (void) bfd_default_set_arch_mach (abfd, bfd_arch_xtensa, mach);
2782 /* The final processing done just before writing out an Xtensa ELF object
2783 file. This gets the Xtensa architecture right based on the machine
2787 elf_xtensa_final_write_processing (bfd *abfd,
2788 bfd_boolean linker ATTRIBUTE_UNUSED)
2793 switch (mach = bfd_get_mach (abfd))
2795 case bfd_mach_xtensa:
2796 val = E_XTENSA_MACH;
2802 elf_elfheader (abfd)->e_flags &= (~ EF_XTENSA_MACH);
2803 elf_elfheader (abfd)->e_flags |= val;
2807 static enum elf_reloc_type_class
2808 elf_xtensa_reloc_type_class (const Elf_Internal_Rela *rela)
2810 switch ((int) ELF32_R_TYPE (rela->r_info))
2812 case R_XTENSA_RELATIVE:
2813 return reloc_class_relative;
2814 case R_XTENSA_JMP_SLOT:
2815 return reloc_class_plt;
2817 return reloc_class_normal;
2823 elf_xtensa_discard_info_for_section (bfd *abfd,
2824 struct elf_reloc_cookie *cookie,
2825 struct bfd_link_info *info,
2829 bfd_vma offset, actual_offset;
2830 bfd_size_type removed_bytes = 0;
2831 bfd_size_type entry_size;
2833 if (sec->output_section
2834 && bfd_is_abs_section (sec->output_section))
2837 if (xtensa_is_proptable_section (sec))
2842 if (sec->size == 0 || sec->size % entry_size != 0)
2845 contents = retrieve_contents (abfd, sec, info->keep_memory);
2849 cookie->rels = retrieve_internal_relocs (abfd, sec, info->keep_memory);
2852 release_contents (sec, contents);
2856 /* Sort the relocations. They should already be in order when
2857 relaxation is enabled, but it might not be. */
2858 qsort (cookie->rels, sec->reloc_count, sizeof (Elf_Internal_Rela),
2859 internal_reloc_compare);
2861 cookie->rel = cookie->rels;
2862 cookie->relend = cookie->rels + sec->reloc_count;
2864 for (offset = 0; offset < sec->size; offset += entry_size)
2866 actual_offset = offset - removed_bytes;
2868 /* The ...symbol_deleted_p function will skip over relocs but it
2869 won't adjust their offsets, so do that here. */
2870 while (cookie->rel < cookie->relend
2871 && cookie->rel->r_offset < offset)
2873 cookie->rel->r_offset -= removed_bytes;
2877 while (cookie->rel < cookie->relend
2878 && cookie->rel->r_offset == offset)
2880 if (bfd_elf_reloc_symbol_deleted_p (offset, cookie))
2882 /* Remove the table entry. (If the reloc type is NONE, then
2883 the entry has already been merged with another and deleted
2884 during relaxation.) */
2885 if (ELF32_R_TYPE (cookie->rel->r_info) != R_XTENSA_NONE)
2887 /* Shift the contents up. */
2888 if (offset + entry_size < sec->size)
2889 memmove (&contents[actual_offset],
2890 &contents[actual_offset + entry_size],
2891 sec->size - offset - entry_size);
2892 removed_bytes += entry_size;
2895 /* Remove this relocation. */
2896 cookie->rel->r_info = ELF32_R_INFO (0, R_XTENSA_NONE);
2899 /* Adjust the relocation offset for previous removals. This
2900 should not be done before calling ...symbol_deleted_p
2901 because it might mess up the offset comparisons there.
2902 Make sure the offset doesn't underflow in the case where
2903 the first entry is removed. */
2904 if (cookie->rel->r_offset >= removed_bytes)
2905 cookie->rel->r_offset -= removed_bytes;
2907 cookie->rel->r_offset = 0;
2913 if (removed_bytes != 0)
2915 /* Adjust any remaining relocs (shouldn't be any). */
2916 for (; cookie->rel < cookie->relend; cookie->rel++)
2918 if (cookie->rel->r_offset >= removed_bytes)
2919 cookie->rel->r_offset -= removed_bytes;
2921 cookie->rel->r_offset = 0;
2924 /* Clear the removed bytes. */
2925 memset (&contents[sec->size - removed_bytes], 0, removed_bytes);
2927 pin_contents (sec, contents);
2928 pin_internal_relocs (sec, cookie->rels);
2931 if (sec->rawsize == 0)
2932 sec->rawsize = sec->size;
2933 sec->size -= removed_bytes;
2935 if (xtensa_is_littable_section (sec))
2937 asection *sgotloc = elf_xtensa_hash_table (info)->sgotloc;
2939 sgotloc->size -= removed_bytes;
2944 release_contents (sec, contents);
2945 release_internal_relocs (sec, cookie->rels);
2948 return (removed_bytes != 0);
2953 elf_xtensa_discard_info (bfd *abfd,
2954 struct elf_reloc_cookie *cookie,
2955 struct bfd_link_info *info)
2958 bfd_boolean changed = FALSE;
2960 for (sec = abfd->sections; sec != NULL; sec = sec->next)
2962 if (xtensa_is_property_section (sec))
2964 if (elf_xtensa_discard_info_for_section (abfd, cookie, info, sec))
2974 elf_xtensa_ignore_discarded_relocs (asection *sec)
2976 return xtensa_is_property_section (sec);
2981 elf_xtensa_action_discarded (asection *sec)
2983 if (strcmp (".xt_except_table", sec->name) == 0)
2986 if (strcmp (".xt_except_desc", sec->name) == 0)
2989 return _bfd_elf_default_action_discarded (sec);
2993 /* Support for core dump NOTE sections. */
2996 elf_xtensa_grok_prstatus (bfd *abfd, Elf_Internal_Note *note)
3001 /* The size for Xtensa is variable, so don't try to recognize the format
3002 based on the size. Just assume this is GNU/Linux. */
3005 elf_tdata (abfd)->core_signal = bfd_get_16 (abfd, note->descdata + 12);
3008 elf_tdata (abfd)->core_pid = bfd_get_32 (abfd, note->descdata + 24);
3012 size = note->descsz - offset - 4;
3014 /* Make a ".reg/999" section. */
3015 return _bfd_elfcore_make_pseudosection (abfd, ".reg",
3016 size, note->descpos + offset);
3021 elf_xtensa_grok_psinfo (bfd *abfd, Elf_Internal_Note *note)
3023 switch (note->descsz)
3028 case 128: /* GNU/Linux elf_prpsinfo */
3029 elf_tdata (abfd)->core_program
3030 = _bfd_elfcore_strndup (abfd, note->descdata + 32, 16);
3031 elf_tdata (abfd)->core_command
3032 = _bfd_elfcore_strndup (abfd, note->descdata + 48, 80);
3035 /* Note that for some reason, a spurious space is tacked
3036 onto the end of the args in some (at least one anyway)
3037 implementations, so strip it off if it exists. */
3040 char *command = elf_tdata (abfd)->core_command;
3041 int n = strlen (command);
3043 if (0 < n && command[n - 1] == ' ')
3044 command[n - 1] = '\0';
3051 /* Generic Xtensa configurability stuff. */
3053 static xtensa_opcode callx0_op = XTENSA_UNDEFINED;
3054 static xtensa_opcode callx4_op = XTENSA_UNDEFINED;
3055 static xtensa_opcode callx8_op = XTENSA_UNDEFINED;
3056 static xtensa_opcode callx12_op = XTENSA_UNDEFINED;
3057 static xtensa_opcode call0_op = XTENSA_UNDEFINED;
3058 static xtensa_opcode call4_op = XTENSA_UNDEFINED;
3059 static xtensa_opcode call8_op = XTENSA_UNDEFINED;
3060 static xtensa_opcode call12_op = XTENSA_UNDEFINED;
3063 init_call_opcodes (void)
3065 if (callx0_op == XTENSA_UNDEFINED)
3067 callx0_op = xtensa_opcode_lookup (xtensa_default_isa, "callx0");
3068 callx4_op = xtensa_opcode_lookup (xtensa_default_isa, "callx4");
3069 callx8_op = xtensa_opcode_lookup (xtensa_default_isa, "callx8");
3070 callx12_op = xtensa_opcode_lookup (xtensa_default_isa, "callx12");
3071 call0_op = xtensa_opcode_lookup (xtensa_default_isa, "call0");
3072 call4_op = xtensa_opcode_lookup (xtensa_default_isa, "call4");
3073 call8_op = xtensa_opcode_lookup (xtensa_default_isa, "call8");
3074 call12_op = xtensa_opcode_lookup (xtensa_default_isa, "call12");
3080 is_indirect_call_opcode (xtensa_opcode opcode)
3082 init_call_opcodes ();
3083 return (opcode == callx0_op
3084 || opcode == callx4_op
3085 || opcode == callx8_op
3086 || opcode == callx12_op);
3091 is_direct_call_opcode (xtensa_opcode opcode)
3093 init_call_opcodes ();
3094 return (opcode == call0_op
3095 || opcode == call4_op
3096 || opcode == call8_op
3097 || opcode == call12_op);
3102 is_windowed_call_opcode (xtensa_opcode opcode)
3104 init_call_opcodes ();
3105 return (opcode == call4_op
3106 || opcode == call8_op
3107 || opcode == call12_op
3108 || opcode == callx4_op
3109 || opcode == callx8_op
3110 || opcode == callx12_op);
3114 static xtensa_opcode
3115 get_const16_opcode (void)
3117 static bfd_boolean done_lookup = FALSE;
3118 static xtensa_opcode const16_opcode = XTENSA_UNDEFINED;
3121 const16_opcode = xtensa_opcode_lookup (xtensa_default_isa, "const16");
3124 return const16_opcode;
3128 static xtensa_opcode
3129 get_l32r_opcode (void)
3131 static xtensa_opcode l32r_opcode = XTENSA_UNDEFINED;
3132 static bfd_boolean done_lookup = FALSE;
3136 l32r_opcode = xtensa_opcode_lookup (xtensa_default_isa, "l32r");
3144 l32r_offset (bfd_vma addr, bfd_vma pc)
3148 offset = addr - ((pc+3) & -4);
3149 BFD_ASSERT ((offset & ((1 << 2) - 1)) == 0);
3150 offset = (signed int) offset >> 2;
3151 BFD_ASSERT ((signed int) offset >> 16 == -1);
3157 get_relocation_opnd (xtensa_opcode opcode, int r_type)
3159 xtensa_isa isa = xtensa_default_isa;
3160 int last_immed, last_opnd, opi;
3162 if (opcode == XTENSA_UNDEFINED)
3163 return XTENSA_UNDEFINED;
3165 /* Find the last visible PC-relative immediate operand for the opcode.
3166 If there are no PC-relative immediates, then choose the last visible
3167 immediate; otherwise, fail and return XTENSA_UNDEFINED. */
3168 last_immed = XTENSA_UNDEFINED;
3169 last_opnd = xtensa_opcode_num_operands (isa, opcode);
3170 for (opi = last_opnd - 1; opi >= 0; opi--)
3172 if (xtensa_operand_is_visible (isa, opcode, opi) == 0)
3174 if (xtensa_operand_is_PCrelative (isa, opcode, opi) == 1)
3179 if (last_immed == XTENSA_UNDEFINED
3180 && xtensa_operand_is_register (isa, opcode, opi) == 0)
3184 return XTENSA_UNDEFINED;
3186 /* If the operand number was specified in an old-style relocation,
3187 check for consistency with the operand computed above. */
3188 if (r_type >= R_XTENSA_OP0 && r_type <= R_XTENSA_OP2)
3190 int reloc_opnd = r_type - R_XTENSA_OP0;
3191 if (reloc_opnd != last_immed)
3192 return XTENSA_UNDEFINED;
3200 get_relocation_slot (int r_type)
3210 if (r_type >= R_XTENSA_SLOT0_OP && r_type <= R_XTENSA_SLOT14_OP)
3211 return r_type - R_XTENSA_SLOT0_OP;
3212 if (r_type >= R_XTENSA_SLOT0_ALT && r_type <= R_XTENSA_SLOT14_ALT)
3213 return r_type - R_XTENSA_SLOT0_ALT;
3217 return XTENSA_UNDEFINED;
3221 /* Get the opcode for a relocation. */
3223 static xtensa_opcode
3224 get_relocation_opcode (bfd *abfd,
3227 Elf_Internal_Rela *irel)
3229 static xtensa_insnbuf ibuff = NULL;
3230 static xtensa_insnbuf sbuff = NULL;
3231 xtensa_isa isa = xtensa_default_isa;
3235 if (contents == NULL)
3236 return XTENSA_UNDEFINED;
3238 if (bfd_get_section_limit (abfd, sec) <= irel->r_offset)
3239 return XTENSA_UNDEFINED;
3243 ibuff = xtensa_insnbuf_alloc (isa);
3244 sbuff = xtensa_insnbuf_alloc (isa);
3247 /* Decode the instruction. */
3248 xtensa_insnbuf_from_chars (isa, ibuff, &contents[irel->r_offset],
3249 sec->size - irel->r_offset);
3250 fmt = xtensa_format_decode (isa, ibuff);
3251 slot = get_relocation_slot (ELF32_R_TYPE (irel->r_info));
3252 if (slot == XTENSA_UNDEFINED)
3253 return XTENSA_UNDEFINED;
3254 xtensa_format_get_slot (isa, fmt, slot, ibuff, sbuff);
3255 return xtensa_opcode_decode (isa, fmt, slot, sbuff);
3260 is_l32r_relocation (bfd *abfd,
3263 Elf_Internal_Rela *irel)
3265 xtensa_opcode opcode;
3266 if (!is_operand_relocation (ELF32_R_TYPE (irel->r_info)))
3268 opcode = get_relocation_opcode (abfd, sec, contents, irel);
3269 return (opcode == get_l32r_opcode ());
3273 static bfd_size_type
3274 get_asm_simplify_size (bfd_byte *contents,
3275 bfd_size_type content_len,
3276 bfd_size_type offset)
3278 bfd_size_type insnlen, size = 0;
3280 /* Decode the size of the next two instructions. */
3281 insnlen = insn_decode_len (contents, content_len, offset);
3287 insnlen = insn_decode_len (contents, content_len, offset + size);
3297 is_alt_relocation (int r_type)
3299 return (r_type >= R_XTENSA_SLOT0_ALT
3300 && r_type <= R_XTENSA_SLOT14_ALT);
3305 is_operand_relocation (int r_type)
3315 if (r_type >= R_XTENSA_SLOT0_OP && r_type <= R_XTENSA_SLOT14_OP)
3317 if (r_type >= R_XTENSA_SLOT0_ALT && r_type <= R_XTENSA_SLOT14_ALT)
3326 #define MIN_INSN_LENGTH 2
3328 /* Return 0 if it fails to decode. */
3331 insn_decode_len (bfd_byte *contents,
3332 bfd_size_type content_len,
3333 bfd_size_type offset)
3336 xtensa_isa isa = xtensa_default_isa;
3338 static xtensa_insnbuf ibuff = NULL;
3340 if (offset + MIN_INSN_LENGTH > content_len)
3344 ibuff = xtensa_insnbuf_alloc (isa);
3345 xtensa_insnbuf_from_chars (isa, ibuff, &contents[offset],
3346 content_len - offset);
3347 fmt = xtensa_format_decode (isa, ibuff);
3348 if (fmt == XTENSA_UNDEFINED)
3350 insn_len = xtensa_format_length (isa, fmt);
3351 if (insn_len == XTENSA_UNDEFINED)
3357 /* Decode the opcode for a single slot instruction.
3358 Return 0 if it fails to decode or the instruction is multi-slot. */
3361 insn_decode_opcode (bfd_byte *contents,
3362 bfd_size_type content_len,
3363 bfd_size_type offset,
3366 xtensa_isa isa = xtensa_default_isa;
3368 static xtensa_insnbuf insnbuf = NULL;
3369 static xtensa_insnbuf slotbuf = NULL;
3371 if (offset + MIN_INSN_LENGTH > content_len)
3372 return XTENSA_UNDEFINED;
3374 if (insnbuf == NULL)
3376 insnbuf = xtensa_insnbuf_alloc (isa);
3377 slotbuf = xtensa_insnbuf_alloc (isa);
3380 xtensa_insnbuf_from_chars (isa, insnbuf, &contents[offset],
3381 content_len - offset);
3382 fmt = xtensa_format_decode (isa, insnbuf);
3383 if (fmt == XTENSA_UNDEFINED)
3384 return XTENSA_UNDEFINED;
3386 if (slot >= xtensa_format_num_slots (isa, fmt))
3387 return XTENSA_UNDEFINED;
3389 xtensa_format_get_slot (isa, fmt, slot, insnbuf, slotbuf);
3390 return xtensa_opcode_decode (isa, fmt, slot, slotbuf);
3394 /* The offset is the offset in the contents.
3395 The address is the address of that offset. */
3398 check_branch_target_aligned (bfd_byte *contents,
3399 bfd_size_type content_length,
3403 bfd_size_type insn_len = insn_decode_len (contents, content_length, offset);
3406 return check_branch_target_aligned_address (address, insn_len);
3411 check_loop_aligned (bfd_byte *contents,
3412 bfd_size_type content_length,
3416 bfd_size_type loop_len, insn_len;
3417 xtensa_opcode opcode;
3419 opcode = insn_decode_opcode (contents, content_length, offset, 0);
3420 if (opcode == XTENSA_UNDEFINED
3421 || xtensa_opcode_is_loop (xtensa_default_isa, opcode) != 1)
3427 loop_len = insn_decode_len (contents, content_length, offset);
3428 insn_len = insn_decode_len (contents, content_length, offset + loop_len);
3429 if (loop_len == 0 || insn_len == 0)
3435 return check_branch_target_aligned_address (address + loop_len, insn_len);
3440 check_branch_target_aligned_address (bfd_vma addr, int len)
3443 return (addr % 8 == 0);
3444 return ((addr >> 2) == ((addr + len - 1) >> 2));
3448 /* Instruction widening and narrowing. */
3450 /* When FLIX is available we need to access certain instructions only
3451 when they are 16-bit or 24-bit instructions. This table caches
3452 information about such instructions by walking through all the
3453 opcodes and finding the smallest single-slot format into which each
3456 static xtensa_format *op_single_fmt_table = NULL;
3460 init_op_single_format_table (void)
3462 xtensa_isa isa = xtensa_default_isa;
3463 xtensa_insnbuf ibuf;
3464 xtensa_opcode opcode;
3468 if (op_single_fmt_table)
3471 ibuf = xtensa_insnbuf_alloc (isa);
3472 num_opcodes = xtensa_isa_num_opcodes (isa);
3474 op_single_fmt_table = (xtensa_format *)
3475 bfd_malloc (sizeof (xtensa_format) * num_opcodes);
3476 for (opcode = 0; opcode < num_opcodes; opcode++)
3478 op_single_fmt_table[opcode] = XTENSA_UNDEFINED;
3479 for (fmt = 0; fmt < xtensa_isa_num_formats (isa); fmt++)
3481 if (xtensa_format_num_slots (isa, fmt) == 1
3482 && xtensa_opcode_encode (isa, fmt, 0, ibuf, opcode) == 0)
3484 xtensa_opcode old_fmt = op_single_fmt_table[opcode];
3485 int fmt_length = xtensa_format_length (isa, fmt);
3486 if (old_fmt == XTENSA_UNDEFINED
3487 || fmt_length < xtensa_format_length (isa, old_fmt))
3488 op_single_fmt_table[opcode] = fmt;
3492 xtensa_insnbuf_free (isa, ibuf);
3496 static xtensa_format
3497 get_single_format (xtensa_opcode opcode)
3499 init_op_single_format_table ();
3500 return op_single_fmt_table[opcode];
3504 /* For the set of narrowable instructions we do NOT include the
3505 narrowings beqz -> beqz.n or bnez -> bnez.n because of complexities
3506 involved during linker relaxation that may require these to
3507 re-expand in some conditions. Also, the narrowing "or" -> mov.n
3508 requires special case code to ensure it only works when op1 == op2. */
3516 struct string_pair narrowable[] =
3519 { "addi", "addi.n" },
3520 { "addmi", "addi.n" },
3521 { "l32i", "l32i.n" },
3522 { "movi", "movi.n" },
3524 { "retw", "retw.n" },
3525 { "s32i", "s32i.n" },
3526 { "or", "mov.n" } /* special case only when op1 == op2 */
3529 struct string_pair widenable[] =
3532 { "addi", "addi.n" },
3533 { "addmi", "addi.n" },
3534 { "beqz", "beqz.n" },
3535 { "bnez", "bnez.n" },
3536 { "l32i", "l32i.n" },
3537 { "movi", "movi.n" },
3539 { "retw", "retw.n" },
3540 { "s32i", "s32i.n" },
3541 { "or", "mov.n" } /* special case only when op1 == op2 */
3545 /* Check if an instruction can be "narrowed", i.e., changed from a standard
3546 3-byte instruction to a 2-byte "density" instruction. If it is valid,
3547 return the instruction buffer holding the narrow instruction. Otherwise,
3548 return 0. The set of valid narrowing are specified by a string table
3549 but require some special case operand checks in some cases. */
3551 static xtensa_insnbuf
3552 can_narrow_instruction (xtensa_insnbuf slotbuf,
3554 xtensa_opcode opcode)
3556 xtensa_isa isa = xtensa_default_isa;
3557 xtensa_format o_fmt;
3560 static xtensa_insnbuf o_insnbuf = NULL;
3561 static xtensa_insnbuf o_slotbuf = NULL;
3563 if (o_insnbuf == NULL)
3565 o_insnbuf = xtensa_insnbuf_alloc (isa);
3566 o_slotbuf = xtensa_insnbuf_alloc (isa);
3569 for (opi = 0; opi < (sizeof (narrowable)/sizeof (struct string_pair)); opi++)
3571 bfd_boolean is_or = (strcmp ("or", narrowable[opi].wide) == 0);
3573 if (opcode == xtensa_opcode_lookup (isa, narrowable[opi].wide))
3575 uint32 value, newval;
3576 int i, operand_count, o_operand_count;
3577 xtensa_opcode o_opcode;
3579 /* Address does not matter in this case. We might need to
3580 fix it to handle branches/jumps. */
3581 bfd_vma self_address = 0;
3583 o_opcode = xtensa_opcode_lookup (isa, narrowable[opi].narrow);
3584 if (o_opcode == XTENSA_UNDEFINED)
3586 o_fmt = get_single_format (o_opcode);
3587 if (o_fmt == XTENSA_UNDEFINED)
3590 if (xtensa_format_length (isa, fmt) != 3
3591 || xtensa_format_length (isa, o_fmt) != 2)
3594 xtensa_format_encode (isa, o_fmt, o_insnbuf);
3595 operand_count = xtensa_opcode_num_operands (isa, opcode);
3596 o_operand_count = xtensa_opcode_num_operands (isa, o_opcode);
3598 if (xtensa_opcode_encode (isa, o_fmt, 0, o_slotbuf, o_opcode) != 0)
3603 if (xtensa_opcode_num_operands (isa, o_opcode) != operand_count)
3608 uint32 rawval0, rawval1, rawval2;
3610 if (o_operand_count + 1 != operand_count
3611 || xtensa_operand_get_field (isa, opcode, 0,
3612 fmt, 0, slotbuf, &rawval0) != 0
3613 || xtensa_operand_get_field (isa, opcode, 1,
3614 fmt, 0, slotbuf, &rawval1) != 0
3615 || xtensa_operand_get_field (isa, opcode, 2,
3616 fmt, 0, slotbuf, &rawval2) != 0
3617 || rawval1 != rawval2
3618 || rawval0 == rawval1 /* it is a nop */)
3622 for (i = 0; i < o_operand_count; ++i)
3624 if (xtensa_operand_get_field (isa, opcode, i, fmt, 0,
3626 || xtensa_operand_decode (isa, opcode, i, &value))
3629 /* PC-relative branches need adjustment, but
3630 the PC-rel operand will always have a relocation. */
3632 if (xtensa_operand_do_reloc (isa, o_opcode, i, &newval,
3634 || xtensa_operand_encode (isa, o_opcode, i, &newval)
3635 || xtensa_operand_set_field (isa, o_opcode, i, o_fmt, 0,
3640 if (xtensa_format_set_slot (isa, o_fmt, 0, o_insnbuf, o_slotbuf))
3650 /* Attempt to narrow an instruction. If the narrowing is valid, perform
3651 the action in-place directly into the contents and return TRUE. Otherwise,
3652 the return value is FALSE and the contents are not modified. */
3655 narrow_instruction (bfd_byte *contents,
3656 bfd_size_type content_length,
3657 bfd_size_type offset)
3659 xtensa_opcode opcode;
3660 bfd_size_type insn_len;
3661 xtensa_isa isa = xtensa_default_isa;
3663 xtensa_insnbuf o_insnbuf;
3665 static xtensa_insnbuf insnbuf = NULL;
3666 static xtensa_insnbuf slotbuf = NULL;
3668 if (insnbuf == NULL)
3670 insnbuf = xtensa_insnbuf_alloc (isa);
3671 slotbuf = xtensa_insnbuf_alloc (isa);
3674 BFD_ASSERT (offset < content_length);
3676 if (content_length < 2)
3679 /* We will hand-code a few of these for a little while.
3680 These have all been specified in the assembler aleady. */
3681 xtensa_insnbuf_from_chars (isa, insnbuf, &contents[offset],
3682 content_length - offset);
3683 fmt = xtensa_format_decode (isa, insnbuf);
3684 if (xtensa_format_num_slots (isa, fmt) != 1)
3687 if (xtensa_format_get_slot (isa, fmt, 0, insnbuf, slotbuf) != 0)
3690 opcode = xtensa_opcode_decode (isa, fmt, 0, slotbuf);
3691 if (opcode == XTENSA_UNDEFINED)
3693 insn_len = xtensa_format_length (isa, fmt);
3694 if (insn_len > content_length)
3697 o_insnbuf = can_narrow_instruction (slotbuf, fmt, opcode);
3700 xtensa_insnbuf_to_chars (isa, o_insnbuf, contents + offset,
3701 content_length - offset);
3709 /* Check if an instruction can be "widened", i.e., changed from a 2-byte
3710 "density" instruction to a standard 3-byte instruction. If it is valid,
3711 return the instruction buffer holding the wide instruction. Otherwise,
3712 return 0. The set of valid widenings are specified by a string table
3713 but require some special case operand checks in some cases. */
3715 static xtensa_insnbuf
3716 can_widen_instruction (xtensa_insnbuf slotbuf,
3718 xtensa_opcode opcode)
3720 xtensa_isa isa = xtensa_default_isa;
3721 xtensa_format o_fmt;
3724 static xtensa_insnbuf o_insnbuf = NULL;
3725 static xtensa_insnbuf o_slotbuf = NULL;
3727 if (o_insnbuf == NULL)
3729 o_insnbuf = xtensa_insnbuf_alloc (isa);
3730 o_slotbuf = xtensa_insnbuf_alloc (isa);
3733 for (opi = 0; opi < (sizeof (widenable)/sizeof (struct string_pair)); opi++)
3735 bfd_boolean is_or = (strcmp ("or", widenable[opi].wide) == 0);
3736 bfd_boolean is_branch = (strcmp ("beqz", widenable[opi].wide) == 0
3737 || strcmp ("bnez", widenable[opi].wide) == 0);
3739 if (opcode == xtensa_opcode_lookup (isa, widenable[opi].narrow))
3741 uint32 value, newval;
3742 int i, operand_count, o_operand_count, check_operand_count;
3743 xtensa_opcode o_opcode;
3745 /* Address does not matter in this case. We might need to fix it
3746 to handle branches/jumps. */
3747 bfd_vma self_address = 0;
3749 o_opcode = xtensa_opcode_lookup (isa, widenable[opi].wide);
3750 if (o_opcode == XTENSA_UNDEFINED)
3752 o_fmt = get_single_format (o_opcode);
3753 if (o_fmt == XTENSA_UNDEFINED)
3756 if (xtensa_format_length (isa, fmt) != 2
3757 || xtensa_format_length (isa, o_fmt) != 3)
3760 xtensa_format_encode (isa, o_fmt, o_insnbuf);
3761 operand_count = xtensa_opcode_num_operands (isa, opcode);
3762 o_operand_count = xtensa_opcode_num_operands (isa, o_opcode);
3763 check_operand_count = o_operand_count;
3765 if (xtensa_opcode_encode (isa, o_fmt, 0, o_slotbuf, o_opcode) != 0)
3770 if (xtensa_opcode_num_operands (isa, o_opcode) != operand_count)
3775 uint32 rawval0, rawval1;
3777 if (o_operand_count != operand_count + 1
3778 || xtensa_operand_get_field (isa, opcode, 0,
3779 fmt, 0, slotbuf, &rawval0) != 0
3780 || xtensa_operand_get_field (isa, opcode, 1,
3781 fmt, 0, slotbuf, &rawval1) != 0
3782 || rawval0 == rawval1 /* it is a nop */)
3786 check_operand_count--;
3788 for (i = 0; i < check_operand_count; i++)
3791 if (is_or && i == o_operand_count - 1)
3793 if (xtensa_operand_get_field (isa, opcode, new_i, fmt, 0,
3795 || xtensa_operand_decode (isa, opcode, new_i, &value))
3798 /* PC-relative branches need adjustment, but
3799 the PC-rel operand will always have a relocation. */
3801 if (xtensa_operand_do_reloc (isa, o_opcode, i, &newval,
3803 || xtensa_operand_encode (isa, o_opcode, i, &newval)
3804 || xtensa_operand_set_field (isa, o_opcode, i, o_fmt, 0,
3809 if (xtensa_format_set_slot (isa, o_fmt, 0, o_insnbuf, o_slotbuf))
3819 /* Attempt to widen an instruction. If the widening is valid, perform
3820 the action in-place directly into the contents and return TRUE. Otherwise,
3821 the return value is FALSE and the contents are not modified. */
3824 widen_instruction (bfd_byte *contents,
3825 bfd_size_type content_length,
3826 bfd_size_type offset)
3828 xtensa_opcode opcode;
3829 bfd_size_type insn_len;
3830 xtensa_isa isa = xtensa_default_isa;
3832 xtensa_insnbuf o_insnbuf;
3834 static xtensa_insnbuf insnbuf = NULL;
3835 static xtensa_insnbuf slotbuf = NULL;
3837 if (insnbuf == NULL)
3839 insnbuf = xtensa_insnbuf_alloc (isa);
3840 slotbuf = xtensa_insnbuf_alloc (isa);
3843 BFD_ASSERT (offset < content_length);
3845 if (content_length < 2)
3848 /* We will hand-code a few of these for a little while.
3849 These have all been specified in the assembler aleady. */
3850 xtensa_insnbuf_from_chars (isa, insnbuf, &contents[offset],
3851 content_length - offset);
3852 fmt = xtensa_format_decode (isa, insnbuf);
3853 if (xtensa_format_num_slots (isa, fmt) != 1)
3856 if (xtensa_format_get_slot (isa, fmt, 0, insnbuf, slotbuf) != 0)
3859 opcode = xtensa_opcode_decode (isa, fmt, 0, slotbuf);
3860 if (opcode == XTENSA_UNDEFINED)
3862 insn_len = xtensa_format_length (isa, fmt);
3863 if (insn_len > content_length)
3866 o_insnbuf = can_widen_instruction (slotbuf, fmt, opcode);
3869 xtensa_insnbuf_to_chars (isa, o_insnbuf, contents + offset,
3870 content_length - offset);
3877 /* Code for transforming CALLs at link-time. */
3879 static bfd_reloc_status_type
3880 elf_xtensa_do_asm_simplify (bfd_byte *contents,
3882 bfd_vma content_length,
3883 char **error_message)
3885 static xtensa_insnbuf insnbuf = NULL;
3886 static xtensa_insnbuf slotbuf = NULL;
3887 xtensa_format core_format = XTENSA_UNDEFINED;
3888 xtensa_opcode opcode;
3889 xtensa_opcode direct_call_opcode;
3890 xtensa_isa isa = xtensa_default_isa;
3891 bfd_byte *chbuf = contents + address;
3894 if (insnbuf == NULL)
3896 insnbuf = xtensa_insnbuf_alloc (isa);
3897 slotbuf = xtensa_insnbuf_alloc (isa);
3900 if (content_length < address)
3902 *error_message = _("Attempt to convert L32R/CALLX to CALL failed");
3903 return bfd_reloc_other;
3906 opcode = get_expanded_call_opcode (chbuf, content_length - address, 0);
3907 direct_call_opcode = swap_callx_for_call_opcode (opcode);
3908 if (direct_call_opcode == XTENSA_UNDEFINED)
3910 *error_message = _("Attempt to convert L32R/CALLX to CALL failed");
3911 return bfd_reloc_other;
3914 /* Assemble a NOP ("or a1, a1, a1") into the 0 byte offset. */
3915 core_format = xtensa_format_lookup (isa, "x24");
3916 opcode = xtensa_opcode_lookup (isa, "or");
3917 xtensa_opcode_encode (isa, core_format, 0, slotbuf, opcode);
3918 for (opn = 0; opn < 3; opn++)
3921 xtensa_operand_encode (isa, opcode, opn, ®no);
3922 xtensa_operand_set_field (isa, opcode, opn, core_format, 0,
3925 xtensa_format_encode (isa, core_format, insnbuf);
3926 xtensa_format_set_slot (isa, core_format, 0, insnbuf, slotbuf);
3927 xtensa_insnbuf_to_chars (isa, insnbuf, chbuf, content_length - address);
3929 /* Assemble a CALL ("callN 0") into the 3 byte offset. */
3930 xtensa_opcode_encode (isa, core_format, 0, slotbuf, direct_call_opcode);
3931 xtensa_operand_set_field (isa, opcode, 0, core_format, 0, slotbuf, 0);
3933 xtensa_format_encode (isa, core_format, insnbuf);
3934 xtensa_format_set_slot (isa, core_format, 0, insnbuf, slotbuf);
3935 xtensa_insnbuf_to_chars (isa, insnbuf, chbuf + 3,
3936 content_length - address - 3);
3938 return bfd_reloc_ok;
3942 static bfd_reloc_status_type
3943 contract_asm_expansion (bfd_byte *contents,
3944 bfd_vma content_length,
3945 Elf_Internal_Rela *irel,
3946 char **error_message)
3948 bfd_reloc_status_type retval =
3949 elf_xtensa_do_asm_simplify (contents, irel->r_offset, content_length,
3952 if (retval != bfd_reloc_ok)
3953 return bfd_reloc_dangerous;
3955 /* Update the irel->r_offset field so that the right immediate and
3956 the right instruction are modified during the relocation. */
3957 irel->r_offset += 3;
3958 irel->r_info = ELF32_R_INFO (ELF32_R_SYM (irel->r_info), R_XTENSA_SLOT0_OP);
3959 return bfd_reloc_ok;
3963 static xtensa_opcode
3964 swap_callx_for_call_opcode (xtensa_opcode opcode)
3966 init_call_opcodes ();
3968 if (opcode == callx0_op) return call0_op;
3969 if (opcode == callx4_op) return call4_op;
3970 if (opcode == callx8_op) return call8_op;
3971 if (opcode == callx12_op) return call12_op;
3973 /* Return XTENSA_UNDEFINED if the opcode is not an indirect call. */
3974 return XTENSA_UNDEFINED;
3978 /* Check if "buf" is pointing to a "L32R aN; CALLX aN" or "CONST16 aN;
3979 CONST16 aN; CALLX aN" sequence, and if so, return the CALLX opcode.
3980 If not, return XTENSA_UNDEFINED. */
3982 #define L32R_TARGET_REG_OPERAND 0
3983 #define CONST16_TARGET_REG_OPERAND 0
3984 #define CALLN_SOURCE_OPERAND 0
3986 static xtensa_opcode
3987 get_expanded_call_opcode (bfd_byte *buf, int bufsize, bfd_boolean *p_uses_l32r)
3989 static xtensa_insnbuf insnbuf = NULL;
3990 static xtensa_insnbuf slotbuf = NULL;
3992 xtensa_opcode opcode;
3993 xtensa_isa isa = xtensa_default_isa;
3994 uint32 regno, const16_regno, call_regno;
3997 if (insnbuf == NULL)
3999 insnbuf = xtensa_insnbuf_alloc (isa);
4000 slotbuf = xtensa_insnbuf_alloc (isa);
4003 xtensa_insnbuf_from_chars (isa, insnbuf, buf, bufsize);
4004 fmt = xtensa_format_decode (isa, insnbuf);
4005 if (fmt == XTENSA_UNDEFINED
4006 || xtensa_format_get_slot (isa, fmt, 0, insnbuf, slotbuf))
4007 return XTENSA_UNDEFINED;
4009 opcode = xtensa_opcode_decode (isa, fmt, 0, slotbuf);
4010 if (opcode == XTENSA_UNDEFINED)
4011 return XTENSA_UNDEFINED;
4013 if (opcode == get_l32r_opcode ())
4016 *p_uses_l32r = TRUE;
4017 if (xtensa_operand_get_field (isa, opcode, L32R_TARGET_REG_OPERAND,
4018 fmt, 0, slotbuf, ®no)
4019 || xtensa_operand_decode (isa, opcode, L32R_TARGET_REG_OPERAND,
4021 return XTENSA_UNDEFINED;
4023 else if (opcode == get_const16_opcode ())
4026 *p_uses_l32r = FALSE;
4027 if (xtensa_operand_get_field (isa, opcode, CONST16_TARGET_REG_OPERAND,
4028 fmt, 0, slotbuf, ®no)
4029 || xtensa_operand_decode (isa, opcode, CONST16_TARGET_REG_OPERAND,
4031 return XTENSA_UNDEFINED;
4033 /* Check that the next instruction is also CONST16. */
4034 offset += xtensa_format_length (isa, fmt);
4035 xtensa_insnbuf_from_chars (isa, insnbuf, buf + offset, bufsize - offset);
4036 fmt = xtensa_format_decode (isa, insnbuf);
4037 if (fmt == XTENSA_UNDEFINED
4038 || xtensa_format_get_slot (isa, fmt, 0, insnbuf, slotbuf))
4039 return XTENSA_UNDEFINED;
4040 opcode = xtensa_opcode_decode (isa, fmt, 0, slotbuf);
4041 if (opcode != get_const16_opcode ())
4042 return XTENSA_UNDEFINED;
4044 if (xtensa_operand_get_field (isa, opcode, CONST16_TARGET_REG_OPERAND,
4045 fmt, 0, slotbuf, &const16_regno)
4046 || xtensa_operand_decode (isa, opcode, CONST16_TARGET_REG_OPERAND,
4048 || const16_regno != regno)
4049 return XTENSA_UNDEFINED;
4052 return XTENSA_UNDEFINED;
4054 /* Next instruction should be an CALLXn with operand 0 == regno. */
4055 offset += xtensa_format_length (isa, fmt);
4056 xtensa_insnbuf_from_chars (isa, insnbuf, buf + offset, bufsize - offset);
4057 fmt = xtensa_format_decode (isa, insnbuf);
4058 if (fmt == XTENSA_UNDEFINED
4059 || xtensa_format_get_slot (isa, fmt, 0, insnbuf, slotbuf))
4060 return XTENSA_UNDEFINED;
4061 opcode = xtensa_opcode_decode (isa, fmt, 0, slotbuf);
4062 if (opcode == XTENSA_UNDEFINED
4063 || !is_indirect_call_opcode (opcode))
4064 return XTENSA_UNDEFINED;
4066 if (xtensa_operand_get_field (isa, opcode, CALLN_SOURCE_OPERAND,
4067 fmt, 0, slotbuf, &call_regno)
4068 || xtensa_operand_decode (isa, opcode, CALLN_SOURCE_OPERAND,
4070 return XTENSA_UNDEFINED;
4072 if (call_regno != regno)
4073 return XTENSA_UNDEFINED;
4079 /* Data structures used during relaxation. */
4081 /* r_reloc: relocation values. */
4083 /* Through the relaxation process, we need to keep track of the values
4084 that will result from evaluating relocations. The standard ELF
4085 relocation structure is not sufficient for this purpose because we're
4086 operating on multiple input files at once, so we need to know which
4087 input file a relocation refers to. The r_reloc structure thus
4088 records both the input file (bfd) and ELF relocation.
4090 For efficiency, an r_reloc also contains a "target_offset" field to
4091 cache the target-section-relative offset value that is represented by
4094 The r_reloc also contains a virtual offset that allows multiple
4095 inserted literals to be placed at the same "address" with
4096 different offsets. */
4098 typedef struct r_reloc_struct r_reloc;
4100 struct r_reloc_struct
4103 Elf_Internal_Rela rela;
4104 bfd_vma target_offset;
4105 bfd_vma virtual_offset;
4109 /* The r_reloc structure is included by value in literal_value, but not
4110 every literal_value has an associated relocation -- some are simple
4111 constants. In such cases, we set all the fields in the r_reloc
4112 struct to zero. The r_reloc_is_const function should be used to
4113 detect this case. */
4116 r_reloc_is_const (const r_reloc *r_rel)
4118 return (r_rel->abfd == NULL);
4123 r_reloc_get_target_offset (const r_reloc *r_rel)
4125 bfd_vma target_offset;
4126 unsigned long r_symndx;
4128 BFD_ASSERT (!r_reloc_is_const (r_rel));
4129 r_symndx = ELF32_R_SYM (r_rel->rela.r_info);
4130 target_offset = get_elf_r_symndx_offset (r_rel->abfd, r_symndx);
4131 return (target_offset + r_rel->rela.r_addend);
4135 static struct elf_link_hash_entry *
4136 r_reloc_get_hash_entry (const r_reloc *r_rel)
4138 unsigned long r_symndx = ELF32_R_SYM (r_rel->rela.r_info);
4139 return get_elf_r_symndx_hash_entry (r_rel->abfd, r_symndx);
4144 r_reloc_get_section (const r_reloc *r_rel)
4146 unsigned long r_symndx = ELF32_R_SYM (r_rel->rela.r_info);
4147 return get_elf_r_symndx_section (r_rel->abfd, r_symndx);
4152 r_reloc_is_defined (const r_reloc *r_rel)
4158 sec = r_reloc_get_section (r_rel);
4159 if (sec == bfd_abs_section_ptr
4160 || sec == bfd_com_section_ptr
4161 || sec == bfd_und_section_ptr)
4168 r_reloc_init (r_reloc *r_rel,
4170 Elf_Internal_Rela *irel,
4172 bfd_size_type content_length)
4175 reloc_howto_type *howto;
4179 r_rel->rela = *irel;
4181 r_rel->target_offset = r_reloc_get_target_offset (r_rel);
4182 r_rel->virtual_offset = 0;
4183 r_type = ELF32_R_TYPE (r_rel->rela.r_info);
4184 howto = &elf_howto_table[r_type];
4185 if (howto->partial_inplace)
4187 bfd_vma inplace_val;
4188 BFD_ASSERT (r_rel->rela.r_offset < content_length);
4190 inplace_val = bfd_get_32 (abfd, &contents[r_rel->rela.r_offset]);
4191 r_rel->target_offset += inplace_val;
4195 memset (r_rel, 0, sizeof (r_reloc));
4202 print_r_reloc (FILE *fp, const r_reloc *r_rel)
4204 if (r_reloc_is_defined (r_rel))
4206 asection *sec = r_reloc_get_section (r_rel);
4207 fprintf (fp, " %s(%s + ", sec->owner->filename, sec->name);
4209 else if (r_reloc_get_hash_entry (r_rel))
4210 fprintf (fp, " %s + ", r_reloc_get_hash_entry (r_rel)->root.root.string);
4212 fprintf (fp, " ?? + ");
4214 fprintf_vma (fp, r_rel->target_offset);
4215 if (r_rel->virtual_offset)
4217 fprintf (fp, " + ");
4218 fprintf_vma (fp, r_rel->virtual_offset);
4227 /* source_reloc: relocations that reference literals. */
4229 /* To determine whether literals can be coalesced, we need to first
4230 record all the relocations that reference the literals. The
4231 source_reloc structure below is used for this purpose. The
4232 source_reloc entries are kept in a per-literal-section array, sorted
4233 by offset within the literal section (i.e., target offset).
4235 The source_sec and r_rel.rela.r_offset fields identify the source of
4236 the relocation. The r_rel field records the relocation value, i.e.,
4237 the offset of the literal being referenced. The opnd field is needed
4238 to determine the range of the immediate field to which the relocation
4239 applies, so we can determine whether another literal with the same
4240 value is within range. The is_null field is true when the relocation
4241 is being removed (e.g., when an L32R is being removed due to a CALLX
4242 that is converted to a direct CALL). */
4244 typedef struct source_reloc_struct source_reloc;
4246 struct source_reloc_struct
4248 asection *source_sec;
4250 xtensa_opcode opcode;
4252 bfd_boolean is_null;
4253 bfd_boolean is_abs_literal;
4258 init_source_reloc (source_reloc *reloc,
4259 asection *source_sec,
4260 const r_reloc *r_rel,
4261 xtensa_opcode opcode,
4263 bfd_boolean is_abs_literal)
4265 reloc->source_sec = source_sec;
4266 reloc->r_rel = *r_rel;
4267 reloc->opcode = opcode;
4269 reloc->is_null = FALSE;
4270 reloc->is_abs_literal = is_abs_literal;
4274 /* Find the source_reloc for a particular source offset and relocation
4275 type. Note that the array is sorted by _target_ offset, so this is
4276 just a linear search. */
4278 static source_reloc *
4279 find_source_reloc (source_reloc *src_relocs,
4282 Elf_Internal_Rela *irel)
4286 for (i = 0; i < src_count; i++)
4288 if (src_relocs[i].source_sec == sec
4289 && src_relocs[i].r_rel.rela.r_offset == irel->r_offset
4290 && (ELF32_R_TYPE (src_relocs[i].r_rel.rela.r_info)
4291 == ELF32_R_TYPE (irel->r_info)))
4292 return &src_relocs[i];
4300 source_reloc_compare (const void *ap, const void *bp)
4302 const source_reloc *a = (const source_reloc *) ap;
4303 const source_reloc *b = (const source_reloc *) bp;
4305 if (a->r_rel.target_offset != b->r_rel.target_offset)
4306 return (a->r_rel.target_offset - b->r_rel.target_offset);
4308 /* We don't need to sort on these criteria for correctness,
4309 but enforcing a more strict ordering prevents unstable qsort
4310 from behaving differently with different implementations.
4311 Without the code below we get correct but different results
4312 on Solaris 2.7 and 2.8. We would like to always produce the
4313 same results no matter the host. */
4315 if ((!a->is_null) - (!b->is_null))
4316 return ((!a->is_null) - (!b->is_null));
4317 return internal_reloc_compare (&a->r_rel.rela, &b->r_rel.rela);
4321 /* Literal values and value hash tables. */
4323 /* Literals with the same value can be coalesced. The literal_value
4324 structure records the value of a literal: the "r_rel" field holds the
4325 information from the relocation on the literal (if there is one) and
4326 the "value" field holds the contents of the literal word itself.
4328 The value_map structure records a literal value along with the
4329 location of a literal holding that value. The value_map hash table
4330 is indexed by the literal value, so that we can quickly check if a
4331 particular literal value has been seen before and is thus a candidate
4334 typedef struct literal_value_struct literal_value;
4335 typedef struct value_map_struct value_map;
4336 typedef struct value_map_hash_table_struct value_map_hash_table;
4338 struct literal_value_struct
4341 unsigned long value;
4342 bfd_boolean is_abs_literal;
4345 struct value_map_struct
4347 literal_value val; /* The literal value. */
4348 r_reloc loc; /* Location of the literal. */
4352 struct value_map_hash_table_struct
4354 unsigned bucket_count;
4355 value_map **buckets;
4357 bfd_boolean has_last_loc;
4363 init_literal_value (literal_value *lit,
4364 const r_reloc *r_rel,
4365 unsigned long value,
4366 bfd_boolean is_abs_literal)
4368 lit->r_rel = *r_rel;
4370 lit->is_abs_literal = is_abs_literal;
4375 literal_value_equal (const literal_value *src1,
4376 const literal_value *src2,
4377 bfd_boolean final_static_link)
4379 struct elf_link_hash_entry *h1, *h2;
4381 if (r_reloc_is_const (&src1->r_rel) != r_reloc_is_const (&src2->r_rel))
4384 if (r_reloc_is_const (&src1->r_rel))
4385 return (src1->value == src2->value);
4387 if (ELF32_R_TYPE (src1->r_rel.rela.r_info)
4388 != ELF32_R_TYPE (src2->r_rel.rela.r_info))
4391 if (src1->r_rel.target_offset != src2->r_rel.target_offset)
4394 if (src1->r_rel.virtual_offset != src2->r_rel.virtual_offset)
4397 if (src1->value != src2->value)
4400 /* Now check for the same section (if defined) or the same elf_hash
4401 (if undefined or weak). */
4402 h1 = r_reloc_get_hash_entry (&src1->r_rel);
4403 h2 = r_reloc_get_hash_entry (&src2->r_rel);
4404 if (r_reloc_is_defined (&src1->r_rel)
4405 && (final_static_link
4406 || ((!h1 || h1->root.type != bfd_link_hash_defweak)
4407 && (!h2 || h2->root.type != bfd_link_hash_defweak))))
4409 if (r_reloc_get_section (&src1->r_rel)
4410 != r_reloc_get_section (&src2->r_rel))
4415 /* Require that the hash entries (i.e., symbols) be identical. */
4416 if (h1 != h2 || h1 == 0)
4420 if (src1->is_abs_literal != src2->is_abs_literal)
4427 /* Must be power of 2. */
4428 #define INITIAL_HASH_RELOC_BUCKET_COUNT 1024
4430 static value_map_hash_table *
4431 value_map_hash_table_init (void)
4433 value_map_hash_table *values;
4435 values = (value_map_hash_table *)
4436 bfd_zmalloc (sizeof (value_map_hash_table));
4437 values->bucket_count = INITIAL_HASH_RELOC_BUCKET_COUNT;
4439 values->buckets = (value_map **)
4440 bfd_zmalloc (sizeof (value_map *) * values->bucket_count);
4441 if (values->buckets == NULL)
4446 values->has_last_loc = FALSE;
4453 value_map_hash_table_delete (value_map_hash_table *table)
4455 free (table->buckets);
4461 hash_bfd_vma (bfd_vma val)
4463 return (val >> 2) + (val >> 10);
4468 literal_value_hash (const literal_value *src)
4472 hash_val = hash_bfd_vma (src->value);
4473 if (!r_reloc_is_const (&src->r_rel))
4477 hash_val += hash_bfd_vma (src->is_abs_literal * 1000);
4478 hash_val += hash_bfd_vma (src->r_rel.target_offset);
4479 hash_val += hash_bfd_vma (src->r_rel.virtual_offset);
4481 /* Now check for the same section and the same elf_hash. */
4482 if (r_reloc_is_defined (&src->r_rel))
4483 sec_or_hash = r_reloc_get_section (&src->r_rel);
4485 sec_or_hash = r_reloc_get_hash_entry (&src->r_rel);
4486 hash_val += hash_bfd_vma ((bfd_vma) (size_t) sec_or_hash);
4492 /* Check if the specified literal_value has been seen before. */
4495 value_map_get_cached_value (value_map_hash_table *map,
4496 const literal_value *val,
4497 bfd_boolean final_static_link)
4503 idx = literal_value_hash (val);
4504 idx = idx & (map->bucket_count - 1);
4505 bucket = map->buckets[idx];
4506 for (map_e = bucket; map_e; map_e = map_e->next)
4508 if (literal_value_equal (&map_e->val, val, final_static_link))
4515 /* Record a new literal value. It is illegal to call this if VALUE
4516 already has an entry here. */
4519 add_value_map (value_map_hash_table *map,
4520 const literal_value *val,
4522 bfd_boolean final_static_link)
4524 value_map **bucket_p;
4527 value_map *val_e = (value_map *) bfd_zmalloc (sizeof (value_map));
4530 bfd_set_error (bfd_error_no_memory);
4534 BFD_ASSERT (!value_map_get_cached_value (map, val, final_static_link));
4538 idx = literal_value_hash (val);
4539 idx = idx & (map->bucket_count - 1);
4540 bucket_p = &map->buckets[idx];
4542 val_e->next = *bucket_p;
4545 /* FIXME: Consider resizing the hash table if we get too many entries. */
4551 /* Lists of text actions (ta_) for narrowing, widening, longcall
4552 conversion, space fill, code & literal removal, etc. */
4554 /* The following text actions are generated:
4556 "ta_remove_insn" remove an instruction or instructions
4557 "ta_remove_longcall" convert longcall to call
4558 "ta_convert_longcall" convert longcall to nop/call
4559 "ta_narrow_insn" narrow a wide instruction
4560 "ta_widen" widen a narrow instruction
4561 "ta_fill" add fill or remove fill
4562 removed < 0 is a fill; branches to the fill address will be
4563 changed to address + fill size (e.g., address - removed)
4564 removed >= 0 branches to the fill address will stay unchanged
4565 "ta_remove_literal" remove a literal; this action is
4566 indicated when a literal is removed
4568 "ta_add_literal" insert a new literal; this action is
4569 indicated when a literal has been moved.
4570 It may use a virtual_offset because
4571 multiple literals can be placed at the
4574 For each of these text actions, we also record the number of bytes
4575 removed by performing the text action. In the case of a "ta_widen"
4576 or a "ta_fill" that adds space, the removed_bytes will be negative. */
4578 typedef struct text_action_struct text_action;
4579 typedef struct text_action_list_struct text_action_list;
4580 typedef enum text_action_enum_t text_action_t;
4582 enum text_action_enum_t
4585 ta_remove_insn, /* removed = -size */
4586 ta_remove_longcall, /* removed = -size */
4587 ta_convert_longcall, /* removed = 0 */
4588 ta_narrow_insn, /* removed = -1 */
4589 ta_widen_insn, /* removed = +1 */
4590 ta_fill, /* removed = +size */
4596 /* Structure for a text action record. */
4597 struct text_action_struct
4599 text_action_t action;
4600 asection *sec; /* Optional */
4602 bfd_vma virtual_offset; /* Zero except for adding literals. */
4604 literal_value value; /* Only valid when adding literals. */
4610 /* List of all of the actions taken on a text section. */
4611 struct text_action_list_struct
4617 static text_action *
4618 find_fill_action (text_action_list *l, asection *sec, bfd_vma offset)
4622 /* It is not necessary to fill at the end of a section. */
4623 if (sec->size == offset)
4626 for (m_p = &l->head; *m_p && (*m_p)->offset <= offset; m_p = &(*m_p)->next)
4628 text_action *t = *m_p;
4629 /* When the action is another fill at the same address,
4630 just increase the size. */
4631 if (t->offset == offset && t->action == ta_fill)
4639 compute_removed_action_diff (const text_action *ta,
4643 int removable_space)
4646 int current_removed = 0;
4649 current_removed = ta->removed_bytes;
4651 BFD_ASSERT (ta == NULL || ta->offset == offset);
4652 BFD_ASSERT (ta == NULL || ta->action == ta_fill);
4654 /* It is not necessary to fill at the end of a section. Clean this up. */
4655 if (sec->size == offset)
4656 new_removed = removable_space - 0;
4660 int added = -removed - current_removed;
4661 /* Ignore multiples of the section alignment. */
4662 added = ((1 << sec->alignment_power) - 1) & added;
4663 new_removed = (-added);
4665 /* Modify for removable. */
4666 space = removable_space - new_removed;
4667 new_removed = (removable_space
4668 - (((1 << sec->alignment_power) - 1) & space));
4670 return (new_removed - current_removed);
4675 adjust_fill_action (text_action *ta, int fill_diff)
4677 ta->removed_bytes += fill_diff;
4681 /* Add a modification action to the text. For the case of adding or
4682 removing space, modify any current fill and assume that
4683 "unreachable_space" bytes can be freely contracted. Note that a
4684 negative removed value is a fill. */
4687 text_action_add (text_action_list *l,
4688 text_action_t action,
4696 /* It is not necessary to fill at the end of a section. */
4697 if (action == ta_fill && sec->size == offset)
4700 /* It is not necessary to fill 0 bytes. */
4701 if (action == ta_fill && removed == 0)
4704 for (m_p = &l->head; *m_p && (*m_p)->offset <= offset; m_p = &(*m_p)->next)
4706 text_action *t = *m_p;
4707 /* When the action is another fill at the same address,
4708 just increase the size. */
4709 if (t->offset == offset && t->action == ta_fill && action == ta_fill)
4711 t->removed_bytes += removed;
4716 /* Create a new record and fill it up. */
4717 ta = (text_action *) bfd_zmalloc (sizeof (text_action));
4718 ta->action = action;
4720 ta->offset = offset;
4721 ta->removed_bytes = removed;
4728 text_action_add_literal (text_action_list *l,
4729 text_action_t action,
4731 const literal_value *value,
4736 asection *sec = r_reloc_get_section (loc);
4737 bfd_vma offset = loc->target_offset;
4738 bfd_vma virtual_offset = loc->virtual_offset;
4740 BFD_ASSERT (action == ta_add_literal);
4742 for (m_p = &l->head; *m_p != NULL; m_p = &(*m_p)->next)
4744 if ((*m_p)->offset > offset
4745 && ((*m_p)->offset != offset
4746 || (*m_p)->virtual_offset > virtual_offset))
4750 /* Create a new record and fill it up. */
4751 ta = (text_action *) bfd_zmalloc (sizeof (text_action));
4752 ta->action = action;
4754 ta->offset = offset;
4755 ta->virtual_offset = virtual_offset;
4757 ta->removed_bytes = removed;
4763 /* Find the total offset adjustment for the relaxations specified by
4764 text_actions, beginning from a particular starting action. This is
4765 typically used from offset_with_removed_text to search an entire list of
4766 actions, but it may also be called directly when adjusting adjacent offsets
4767 so that each search may begin where the previous one left off. */
4770 removed_by_actions (text_action **p_start_action,
4772 bfd_boolean before_fill)
4777 r = *p_start_action;
4780 if (r->offset > offset)
4783 if (r->offset == offset
4784 && (before_fill || r->action != ta_fill || r->removed_bytes >= 0))
4787 removed += r->removed_bytes;
4792 *p_start_action = r;
4798 offset_with_removed_text (text_action_list *action_list, bfd_vma offset)
4800 text_action *r = action_list->head;
4801 return offset - removed_by_actions (&r, offset, FALSE);
4806 action_list_count (text_action_list *action_list)
4808 text_action *r = action_list->head;
4810 for (r = action_list->head; r != NULL; r = r->next)
4818 /* The find_insn_action routine will only find non-fill actions. */
4820 static text_action *
4821 find_insn_action (text_action_list *action_list, bfd_vma offset)
4824 for (t = action_list->head; t; t = t->next)
4826 if (t->offset == offset)
4833 case ta_remove_insn:
4834 case ta_remove_longcall:
4835 case ta_convert_longcall:
4836 case ta_narrow_insn:
4839 case ta_remove_literal:
4840 case ta_add_literal:
4853 print_action_list (FILE *fp, text_action_list *action_list)
4857 fprintf (fp, "Text Action\n");
4858 for (r = action_list->head; r != NULL; r = r->next)
4860 const char *t = "unknown";
4863 case ta_remove_insn:
4864 t = "remove_insn"; break;
4865 case ta_remove_longcall:
4866 t = "remove_longcall"; break;
4867 case ta_convert_longcall:
4868 t = "convert_longcall"; break;
4869 case ta_narrow_insn:
4870 t = "narrow_insn"; break;
4872 t = "widen_insn"; break;
4877 case ta_remove_literal:
4878 t = "remove_literal"; break;
4879 case ta_add_literal:
4880 t = "add_literal"; break;
4883 fprintf (fp, "%s: %s[0x%lx] \"%s\" %d\n",
4884 r->sec->owner->filename,
4885 r->sec->name, r->offset, t, r->removed_bytes);
4892 /* Lists of literals being coalesced or removed. */
4894 /* In the usual case, the literal identified by "from" is being
4895 coalesced with another literal identified by "to". If the literal is
4896 unused and is being removed altogether, "to.abfd" will be NULL.
4897 The removed_literal entries are kept on a per-section list, sorted
4898 by the "from" offset field. */
4900 typedef struct removed_literal_struct removed_literal;
4901 typedef struct removed_literal_list_struct removed_literal_list;
4903 struct removed_literal_struct
4907 removed_literal *next;
4910 struct removed_literal_list_struct
4912 removed_literal *head;
4913 removed_literal *tail;
4917 /* Record that the literal at "from" is being removed. If "to" is not
4918 NULL, the "from" literal is being coalesced with the "to" literal. */
4921 add_removed_literal (removed_literal_list *removed_list,
4922 const r_reloc *from,
4925 removed_literal *r, *new_r, *next_r;
4927 new_r = (removed_literal *) bfd_zmalloc (sizeof (removed_literal));
4929 new_r->from = *from;
4933 new_r->to.abfd = NULL;
4936 r = removed_list->head;
4939 removed_list->head = new_r;
4940 removed_list->tail = new_r;
4942 /* Special check for common case of append. */
4943 else if (removed_list->tail->from.target_offset < from->target_offset)
4945 removed_list->tail->next = new_r;
4946 removed_list->tail = new_r;
4950 while (r->from.target_offset < from->target_offset && r->next)
4956 new_r->next = next_r;
4958 removed_list->tail = new_r;
4963 /* Check if the list of removed literals contains an entry for the
4964 given address. Return the entry if found. */
4966 static removed_literal *
4967 find_removed_literal (removed_literal_list *removed_list, bfd_vma addr)
4969 removed_literal *r = removed_list->head;
4970 while (r && r->from.target_offset < addr)
4972 if (r && r->from.target_offset == addr)
4981 print_removed_literals (FILE *fp, removed_literal_list *removed_list)
4984 r = removed_list->head;
4986 fprintf (fp, "Removed Literals\n");
4987 for (; r != NULL; r = r->next)
4989 print_r_reloc (fp, &r->from);
4990 fprintf (fp, " => ");
4991 if (r->to.abfd == NULL)
4992 fprintf (fp, "REMOVED");
4994 print_r_reloc (fp, &r->to);
5002 /* Per-section data for relaxation. */
5004 typedef struct reloc_bfd_fix_struct reloc_bfd_fix;
5006 struct xtensa_relax_info_struct
5008 bfd_boolean is_relaxable_literal_section;
5009 bfd_boolean is_relaxable_asm_section;
5010 int visited; /* Number of times visited. */
5012 source_reloc *src_relocs; /* Array[src_count]. */
5014 int src_next; /* Next src_relocs entry to assign. */
5016 removed_literal_list removed_list;
5017 text_action_list action_list;
5019 reloc_bfd_fix *fix_list;
5020 reloc_bfd_fix *fix_array;
5021 unsigned fix_array_count;
5023 /* Support for expanding the reloc array that is stored
5024 in the section structure. If the relocations have been
5025 reallocated, the newly allocated relocations will be referenced
5026 here along with the actual size allocated. The relocation
5027 count will always be found in the section structure. */
5028 Elf_Internal_Rela *allocated_relocs;
5029 unsigned relocs_count;
5030 unsigned allocated_relocs_count;
5033 struct elf_xtensa_section_data
5035 struct bfd_elf_section_data elf;
5036 xtensa_relax_info relax_info;
5041 elf_xtensa_new_section_hook (bfd *abfd, asection *sec)
5043 if (!sec->used_by_bfd)
5045 struct elf_xtensa_section_data *sdata;
5046 bfd_size_type amt = sizeof (*sdata);
5048 sdata = bfd_zalloc (abfd, amt);
5051 sec->used_by_bfd = sdata;
5054 return _bfd_elf_new_section_hook (abfd, sec);
5058 static xtensa_relax_info *
5059 get_xtensa_relax_info (asection *sec)
5061 struct elf_xtensa_section_data *section_data;
5063 /* No info available if no section or if it is an output section. */
5064 if (!sec || sec == sec->output_section)
5067 section_data = (struct elf_xtensa_section_data *) elf_section_data (sec);
5068 return §ion_data->relax_info;
5073 init_xtensa_relax_info (asection *sec)
5075 xtensa_relax_info *relax_info = get_xtensa_relax_info (sec);
5077 relax_info->is_relaxable_literal_section = FALSE;
5078 relax_info->is_relaxable_asm_section = FALSE;
5079 relax_info->visited = 0;
5081 relax_info->src_relocs = NULL;
5082 relax_info->src_count = 0;
5083 relax_info->src_next = 0;
5085 relax_info->removed_list.head = NULL;
5086 relax_info->removed_list.tail = NULL;
5088 relax_info->action_list.head = NULL;
5090 relax_info->fix_list = NULL;
5091 relax_info->fix_array = NULL;
5092 relax_info->fix_array_count = 0;
5094 relax_info->allocated_relocs = NULL;
5095 relax_info->relocs_count = 0;
5096 relax_info->allocated_relocs_count = 0;
5100 /* Coalescing literals may require a relocation to refer to a section in
5101 a different input file, but the standard relocation information
5102 cannot express that. Instead, the reloc_bfd_fix structures are used
5103 to "fix" the relocations that refer to sections in other input files.
5104 These structures are kept on per-section lists. The "src_type" field
5105 records the relocation type in case there are multiple relocations on
5106 the same location. FIXME: This is ugly; an alternative might be to
5107 add new symbols with the "owner" field to some other input file. */
5109 struct reloc_bfd_fix_struct
5113 unsigned src_type; /* Relocation type. */
5115 asection *target_sec;
5116 bfd_vma target_offset;
5117 bfd_boolean translated;
5119 reloc_bfd_fix *next;
5123 static reloc_bfd_fix *
5124 reloc_bfd_fix_init (asection *src_sec,
5127 asection *target_sec,
5128 bfd_vma target_offset,
5129 bfd_boolean translated)
5133 fix = (reloc_bfd_fix *) bfd_malloc (sizeof (reloc_bfd_fix));
5134 fix->src_sec = src_sec;
5135 fix->src_offset = src_offset;
5136 fix->src_type = src_type;
5137 fix->target_sec = target_sec;
5138 fix->target_offset = target_offset;
5139 fix->translated = translated;
5146 add_fix (asection *src_sec, reloc_bfd_fix *fix)
5148 xtensa_relax_info *relax_info;
5150 relax_info = get_xtensa_relax_info (src_sec);
5151 fix->next = relax_info->fix_list;
5152 relax_info->fix_list = fix;
5157 fix_compare (const void *ap, const void *bp)
5159 const reloc_bfd_fix *a = (const reloc_bfd_fix *) ap;
5160 const reloc_bfd_fix *b = (const reloc_bfd_fix *) bp;
5162 if (a->src_offset != b->src_offset)
5163 return (a->src_offset - b->src_offset);
5164 return (a->src_type - b->src_type);
5169 cache_fix_array (asection *sec)
5171 unsigned i, count = 0;
5173 xtensa_relax_info *relax_info = get_xtensa_relax_info (sec);
5175 if (relax_info == NULL)
5177 if (relax_info->fix_list == NULL)
5180 for (r = relax_info->fix_list; r != NULL; r = r->next)
5183 relax_info->fix_array =
5184 (reloc_bfd_fix *) bfd_malloc (sizeof (reloc_bfd_fix) * count);
5185 relax_info->fix_array_count = count;
5187 r = relax_info->fix_list;
5188 for (i = 0; i < count; i++, r = r->next)
5190 relax_info->fix_array[count - 1 - i] = *r;
5191 relax_info->fix_array[count - 1 - i].next = NULL;
5194 qsort (relax_info->fix_array, relax_info->fix_array_count,
5195 sizeof (reloc_bfd_fix), fix_compare);
5199 static reloc_bfd_fix *
5200 get_bfd_fix (asection *sec, bfd_vma offset, unsigned type)
5202 xtensa_relax_info *relax_info = get_xtensa_relax_info (sec);
5206 if (relax_info == NULL)
5208 if (relax_info->fix_list == NULL)
5211 if (relax_info->fix_array == NULL)
5212 cache_fix_array (sec);
5214 key.src_offset = offset;
5215 key.src_type = type;
5216 rv = bsearch (&key, relax_info->fix_array, relax_info->fix_array_count,
5217 sizeof (reloc_bfd_fix), fix_compare);
5222 /* Section caching. */
5224 typedef struct section_cache_struct section_cache_t;
5226 struct section_cache_struct
5230 bfd_byte *contents; /* Cache of the section contents. */
5231 bfd_size_type content_length;
5233 property_table_entry *ptbl; /* Cache of the section property table. */
5236 Elf_Internal_Rela *relocs; /* Cache of the section relocations. */
5237 unsigned reloc_count;
5242 init_section_cache (section_cache_t *sec_cache)
5244 memset (sec_cache, 0, sizeof (*sec_cache));
5249 clear_section_cache (section_cache_t *sec_cache)
5253 release_contents (sec_cache->sec, sec_cache->contents);
5254 release_internal_relocs (sec_cache->sec, sec_cache->relocs);
5255 if (sec_cache->ptbl)
5256 free (sec_cache->ptbl);
5257 memset (sec_cache, 0, sizeof (sec_cache));
5263 section_cache_section (section_cache_t *sec_cache,
5265 struct bfd_link_info *link_info)
5268 property_table_entry *prop_table = NULL;
5270 bfd_byte *contents = NULL;
5271 Elf_Internal_Rela *internal_relocs = NULL;
5272 bfd_size_type sec_size;
5276 if (sec == sec_cache->sec)
5280 sec_size = bfd_get_section_limit (abfd, sec);
5282 /* Get the contents. */
5283 contents = retrieve_contents (abfd, sec, link_info->keep_memory);
5284 if (contents == NULL && sec_size != 0)
5287 /* Get the relocations. */
5288 internal_relocs = retrieve_internal_relocs (abfd, sec,
5289 link_info->keep_memory);
5291 /* Get the entry table. */
5292 ptblsize = xtensa_read_table_entries (abfd, sec, &prop_table,
5293 XTENSA_PROP_SEC_NAME, FALSE);
5297 /* Fill in the new section cache. */
5298 clear_section_cache (sec_cache);
5299 memset (sec_cache, 0, sizeof (sec_cache));
5301 sec_cache->sec = sec;
5302 sec_cache->contents = contents;
5303 sec_cache->content_length = sec_size;
5304 sec_cache->relocs = internal_relocs;
5305 sec_cache->reloc_count = sec->reloc_count;
5306 sec_cache->pte_count = ptblsize;
5307 sec_cache->ptbl = prop_table;
5312 release_contents (sec, contents);
5313 release_internal_relocs (sec, internal_relocs);
5320 /* Extended basic blocks. */
5322 /* An ebb_struct represents an Extended Basic Block. Within this
5323 range, we guarantee that all instructions are decodable, the
5324 property table entries are contiguous, and no property table
5325 specifies a segment that cannot have instructions moved. This
5326 structure contains caches of the contents, property table and
5327 relocations for the specified section for easy use. The range is
5328 specified by ranges of indices for the byte offset, property table
5329 offsets and relocation offsets. These must be consistent. */
5331 typedef struct ebb_struct ebb_t;
5337 bfd_byte *contents; /* Cache of the section contents. */
5338 bfd_size_type content_length;
5340 property_table_entry *ptbl; /* Cache of the section property table. */
5343 Elf_Internal_Rela *relocs; /* Cache of the section relocations. */
5344 unsigned reloc_count;
5346 bfd_vma start_offset; /* Offset in section. */
5347 unsigned start_ptbl_idx; /* Offset in the property table. */
5348 unsigned start_reloc_idx; /* Offset in the relocations. */
5351 unsigned end_ptbl_idx;
5352 unsigned end_reloc_idx;
5354 bfd_boolean ends_section; /* Is this the last ebb in a section? */
5356 /* The unreachable property table at the end of this set of blocks;
5357 NULL if the end is not an unreachable block. */
5358 property_table_entry *ends_unreachable;
5362 enum ebb_target_enum
5365 EBB_DESIRE_TGT_ALIGN,
5366 EBB_REQUIRE_TGT_ALIGN,
5367 EBB_REQUIRE_LOOP_ALIGN,
5372 /* proposed_action_struct is similar to the text_action_struct except
5373 that is represents a potential transformation, not one that will
5374 occur. We build a list of these for an extended basic block
5375 and use them to compute the actual actions desired. We must be
5376 careful that the entire set of actual actions we perform do not
5377 break any relocations that would fit if the actions were not
5380 typedef struct proposed_action_struct proposed_action;
5382 struct proposed_action_struct
5384 enum ebb_target_enum align_type; /* for the target alignment */
5385 bfd_vma alignment_pow;
5386 text_action_t action;
5389 bfd_boolean do_action; /* If false, then we will not perform the action. */
5393 /* The ebb_constraint_struct keeps a set of proposed actions for an
5394 extended basic block. */
5396 typedef struct ebb_constraint_struct ebb_constraint;
5398 struct ebb_constraint_struct
5401 bfd_boolean start_movable;
5403 /* Bytes of extra space at the beginning if movable. */
5404 int start_extra_space;
5406 enum ebb_target_enum start_align;
5408 bfd_boolean end_movable;
5410 /* Bytes of extra space at the end if movable. */
5411 int end_extra_space;
5413 unsigned action_count;
5414 unsigned action_allocated;
5416 /* Array of proposed actions. */
5417 proposed_action *actions;
5419 /* Action alignments -- one for each proposed action. */
5420 enum ebb_target_enum *action_aligns;
5425 init_ebb_constraint (ebb_constraint *c)
5427 memset (c, 0, sizeof (ebb_constraint));
5432 free_ebb_constraint (ebb_constraint *c)
5440 init_ebb (ebb_t *ebb,
5443 bfd_size_type content_length,
5444 property_table_entry *prop_table,
5446 Elf_Internal_Rela *internal_relocs,
5447 unsigned reloc_count)
5449 memset (ebb, 0, sizeof (ebb_t));
5451 ebb->contents = contents;
5452 ebb->content_length = content_length;
5453 ebb->ptbl = prop_table;
5454 ebb->pte_count = ptblsize;
5455 ebb->relocs = internal_relocs;
5456 ebb->reloc_count = reloc_count;
5457 ebb->start_offset = 0;
5458 ebb->end_offset = ebb->content_length - 1;
5459 ebb->start_ptbl_idx = 0;
5460 ebb->end_ptbl_idx = ptblsize;
5461 ebb->start_reloc_idx = 0;
5462 ebb->end_reloc_idx = reloc_count;
5466 /* Extend the ebb to all decodable contiguous sections. The algorithm
5467 for building a basic block around an instruction is to push it
5468 forward until we hit the end of a section, an unreachable block or
5469 a block that cannot be transformed. Then we push it backwards
5470 searching for similar conditions. */
5472 static bfd_boolean extend_ebb_bounds_forward (ebb_t *);
5473 static bfd_boolean extend_ebb_bounds_backward (ebb_t *);
5474 static bfd_size_type insn_block_decodable_len
5475 (bfd_byte *, bfd_size_type, bfd_vma, bfd_size_type);
5478 extend_ebb_bounds (ebb_t *ebb)
5480 if (!extend_ebb_bounds_forward (ebb))
5482 if (!extend_ebb_bounds_backward (ebb))
5489 extend_ebb_bounds_forward (ebb_t *ebb)
5491 property_table_entry *the_entry, *new_entry;
5493 the_entry = &ebb->ptbl[ebb->end_ptbl_idx];
5495 /* Stop when (1) we cannot decode an instruction, (2) we are at
5496 the end of the property tables, (3) we hit a non-contiguous property
5497 table entry, (4) we hit a NO_TRANSFORM region. */
5502 bfd_size_type insn_block_len;
5504 entry_end = the_entry->address - ebb->sec->vma + the_entry->size;
5506 insn_block_decodable_len (ebb->contents, ebb->content_length,
5508 entry_end - ebb->end_offset);
5509 if (insn_block_len != (entry_end - ebb->end_offset))
5511 (*_bfd_error_handler)
5512 (_("%B(%A+0x%lx): could not decode instruction; possible configuration mismatch"),
5513 ebb->sec->owner, ebb->sec, ebb->end_offset + insn_block_len);
5516 ebb->end_offset += insn_block_len;
5518 if (ebb->end_offset == ebb->sec->size)
5519 ebb->ends_section = TRUE;
5521 /* Update the reloc counter. */
5522 while (ebb->end_reloc_idx + 1 < ebb->reloc_count
5523 && (ebb->relocs[ebb->end_reloc_idx + 1].r_offset
5526 ebb->end_reloc_idx++;
5529 if (ebb->end_ptbl_idx + 1 == ebb->pte_count)
5532 new_entry = &ebb->ptbl[ebb->end_ptbl_idx + 1];
5533 if (((new_entry->flags & XTENSA_PROP_INSN) == 0)
5534 || ((new_entry->flags & XTENSA_PROP_NO_TRANSFORM) != 0)
5535 || ((the_entry->flags & XTENSA_PROP_ALIGN) != 0))
5538 if (the_entry->address + the_entry->size != new_entry->address)
5541 the_entry = new_entry;
5542 ebb->end_ptbl_idx++;
5545 /* Quick check for an unreachable or end of file just at the end. */
5546 if (ebb->end_ptbl_idx + 1 == ebb->pte_count)
5548 if (ebb->end_offset == ebb->content_length)
5549 ebb->ends_section = TRUE;
5553 new_entry = &ebb->ptbl[ebb->end_ptbl_idx + 1];
5554 if ((new_entry->flags & XTENSA_PROP_UNREACHABLE) != 0
5555 && the_entry->address + the_entry->size == new_entry->address)
5556 ebb->ends_unreachable = new_entry;
5559 /* Any other ending requires exact alignment. */
5565 extend_ebb_bounds_backward (ebb_t *ebb)
5567 property_table_entry *the_entry, *new_entry;
5569 the_entry = &ebb->ptbl[ebb->start_ptbl_idx];
5571 /* Stop when (1) we cannot decode the instructions in the current entry.
5572 (2) we are at the beginning of the property tables, (3) we hit a
5573 non-contiguous property table entry, (4) we hit a NO_TRANSFORM region. */
5577 bfd_vma block_begin;
5578 bfd_size_type insn_block_len;
5580 block_begin = the_entry->address - ebb->sec->vma;
5582 insn_block_decodable_len (ebb->contents, ebb->content_length,
5584 ebb->start_offset - block_begin);
5585 if (insn_block_len != ebb->start_offset - block_begin)
5587 (*_bfd_error_handler)
5588 (_("%B(%A+0x%lx): could not decode instruction; possible configuration mismatch"),
5589 ebb->sec->owner, ebb->sec, ebb->end_offset + insn_block_len);
5592 ebb->start_offset -= insn_block_len;
5594 /* Update the reloc counter. */
5595 while (ebb->start_reloc_idx > 0
5596 && (ebb->relocs[ebb->start_reloc_idx - 1].r_offset
5597 >= ebb->start_offset))
5599 ebb->start_reloc_idx--;
5602 if (ebb->start_ptbl_idx == 0)
5605 new_entry = &ebb->ptbl[ebb->start_ptbl_idx - 1];
5606 if ((new_entry->flags & XTENSA_PROP_INSN) == 0
5607 || ((new_entry->flags & XTENSA_PROP_NO_TRANSFORM) != 0)
5608 || ((new_entry->flags & XTENSA_PROP_ALIGN) != 0))
5610 if (new_entry->address + new_entry->size != the_entry->address)
5613 the_entry = new_entry;
5614 ebb->start_ptbl_idx--;
5620 static bfd_size_type
5621 insn_block_decodable_len (bfd_byte *contents,
5622 bfd_size_type content_len,
5623 bfd_vma block_offset,
5624 bfd_size_type block_len)
5626 bfd_vma offset = block_offset;
5628 while (offset < block_offset + block_len)
5630 bfd_size_type insn_len = 0;
5632 insn_len = insn_decode_len (contents, content_len, offset);
5634 return (offset - block_offset);
5637 return (offset - block_offset);
5642 ebb_propose_action (ebb_constraint *c,
5643 enum ebb_target_enum align_type,
5644 bfd_vma alignment_pow,
5645 text_action_t action,
5648 bfd_boolean do_action)
5650 proposed_action *act;
5652 if (c->action_allocated <= c->action_count)
5654 unsigned new_allocated, i;
5655 proposed_action *new_actions;
5657 new_allocated = (c->action_count + 2) * 2;
5658 new_actions = (proposed_action *)
5659 bfd_zmalloc (sizeof (proposed_action) * new_allocated);
5661 for (i = 0; i < c->action_count; i++)
5662 new_actions[i] = c->actions[i];
5665 c->actions = new_actions;
5666 c->action_allocated = new_allocated;
5669 act = &c->actions[c->action_count];
5670 act->align_type = align_type;
5671 act->alignment_pow = alignment_pow;
5672 act->action = action;
5673 act->offset = offset;
5674 act->removed_bytes = removed_bytes;
5675 act->do_action = do_action;
5681 /* Access to internal relocations, section contents and symbols. */
5683 /* During relaxation, we need to modify relocations, section contents,
5684 and symbol definitions, and we need to keep the original values from
5685 being reloaded from the input files, i.e., we need to "pin" the
5686 modified values in memory. We also want to continue to observe the
5687 setting of the "keep-memory" flag. The following functions wrap the
5688 standard BFD functions to take care of this for us. */
5690 static Elf_Internal_Rela *
5691 retrieve_internal_relocs (bfd *abfd, asection *sec, bfd_boolean keep_memory)
5693 Elf_Internal_Rela *internal_relocs;
5695 if ((sec->flags & SEC_LINKER_CREATED) != 0)
5698 internal_relocs = elf_section_data (sec)->relocs;
5699 if (internal_relocs == NULL)
5700 internal_relocs = (_bfd_elf_link_read_relocs
5701 (abfd, sec, NULL, NULL, keep_memory));
5702 return internal_relocs;
5707 pin_internal_relocs (asection *sec, Elf_Internal_Rela *internal_relocs)
5709 elf_section_data (sec)->relocs = internal_relocs;
5714 release_internal_relocs (asection *sec, Elf_Internal_Rela *internal_relocs)
5717 && elf_section_data (sec)->relocs != internal_relocs)
5718 free (internal_relocs);
5723 retrieve_contents (bfd *abfd, asection *sec, bfd_boolean keep_memory)
5726 bfd_size_type sec_size;
5728 sec_size = bfd_get_section_limit (abfd, sec);
5729 contents = elf_section_data (sec)->this_hdr.contents;
5731 if (contents == NULL && sec_size != 0)
5733 if (!bfd_malloc_and_get_section (abfd, sec, &contents))
5740 elf_section_data (sec)->this_hdr.contents = contents;
5747 pin_contents (asection *sec, bfd_byte *contents)
5749 elf_section_data (sec)->this_hdr.contents = contents;
5754 release_contents (asection *sec, bfd_byte *contents)
5756 if (contents && elf_section_data (sec)->this_hdr.contents != contents)
5761 static Elf_Internal_Sym *
5762 retrieve_local_syms (bfd *input_bfd)
5764 Elf_Internal_Shdr *symtab_hdr;
5765 Elf_Internal_Sym *isymbuf;
5768 symtab_hdr = &elf_tdata (input_bfd)->symtab_hdr;
5769 locsymcount = symtab_hdr->sh_info;
5771 isymbuf = (Elf_Internal_Sym *) symtab_hdr->contents;
5772 if (isymbuf == NULL && locsymcount != 0)
5773 isymbuf = bfd_elf_get_elf_syms (input_bfd, symtab_hdr, locsymcount, 0,
5776 /* Save the symbols for this input file so they won't be read again. */
5777 if (isymbuf && isymbuf != (Elf_Internal_Sym *) symtab_hdr->contents)
5778 symtab_hdr->contents = (unsigned char *) isymbuf;
5784 /* Code for link-time relaxation. */
5786 /* Initialization for relaxation: */
5787 static bfd_boolean analyze_relocations (struct bfd_link_info *);
5788 static bfd_boolean find_relaxable_sections
5789 (bfd *, asection *, struct bfd_link_info *, bfd_boolean *);
5790 static bfd_boolean collect_source_relocs
5791 (bfd *, asection *, struct bfd_link_info *);
5792 static bfd_boolean is_resolvable_asm_expansion
5793 (bfd *, asection *, bfd_byte *, Elf_Internal_Rela *, struct bfd_link_info *,
5795 static Elf_Internal_Rela *find_associated_l32r_irel
5796 (bfd *, asection *, bfd_byte *, Elf_Internal_Rela *, Elf_Internal_Rela *);
5797 static bfd_boolean compute_text_actions
5798 (bfd *, asection *, struct bfd_link_info *);
5799 static bfd_boolean compute_ebb_proposed_actions (ebb_constraint *);
5800 static bfd_boolean compute_ebb_actions (ebb_constraint *);
5801 static bfd_boolean check_section_ebb_pcrels_fit
5802 (bfd *, asection *, bfd_byte *, Elf_Internal_Rela *, const ebb_constraint *,
5803 const xtensa_opcode *);
5804 static bfd_boolean check_section_ebb_reduces (const ebb_constraint *);
5805 static void text_action_add_proposed
5806 (text_action_list *, const ebb_constraint *, asection *);
5807 static int compute_fill_extra_space (property_table_entry *);
5810 static bfd_boolean compute_removed_literals
5811 (bfd *, asection *, struct bfd_link_info *, value_map_hash_table *);
5812 static Elf_Internal_Rela *get_irel_at_offset
5813 (asection *, Elf_Internal_Rela *, bfd_vma);
5814 static bfd_boolean is_removable_literal
5815 (const source_reloc *, int, const source_reloc *, int, asection *,
5816 property_table_entry *, int);
5817 static bfd_boolean remove_dead_literal
5818 (bfd *, asection *, struct bfd_link_info *, Elf_Internal_Rela *,
5819 Elf_Internal_Rela *, source_reloc *, property_table_entry *, int);
5820 static bfd_boolean identify_literal_placement
5821 (bfd *, asection *, bfd_byte *, struct bfd_link_info *,
5822 value_map_hash_table *, bfd_boolean *, Elf_Internal_Rela *, int,
5823 source_reloc *, property_table_entry *, int, section_cache_t *,
5825 static bfd_boolean relocations_reach (source_reloc *, int, const r_reloc *);
5826 static bfd_boolean coalesce_shared_literal
5827 (asection *, source_reloc *, property_table_entry *, int, value_map *);
5828 static bfd_boolean move_shared_literal
5829 (asection *, struct bfd_link_info *, source_reloc *, property_table_entry *,
5830 int, const r_reloc *, const literal_value *, section_cache_t *);
5833 static bfd_boolean relax_section (bfd *, asection *, struct bfd_link_info *);
5834 static bfd_boolean translate_section_fixes (asection *);
5835 static bfd_boolean translate_reloc_bfd_fix (reloc_bfd_fix *);
5836 static asection *translate_reloc (const r_reloc *, r_reloc *, asection *);
5837 static void shrink_dynamic_reloc_sections
5838 (struct bfd_link_info *, bfd *, asection *, Elf_Internal_Rela *);
5839 static bfd_boolean move_literal
5840 (bfd *, struct bfd_link_info *, asection *, bfd_vma, bfd_byte *,
5841 xtensa_relax_info *, Elf_Internal_Rela **, const literal_value *);
5842 static bfd_boolean relax_property_section
5843 (bfd *, asection *, struct bfd_link_info *);
5846 static bfd_boolean relax_section_symbols (bfd *, asection *);
5850 elf_xtensa_relax_section (bfd *abfd,
5852 struct bfd_link_info *link_info,
5855 static value_map_hash_table *values = NULL;
5856 static bfd_boolean relocations_analyzed = FALSE;
5857 xtensa_relax_info *relax_info;
5859 if (!relocations_analyzed)
5861 /* Do some overall initialization for relaxation. */
5862 values = value_map_hash_table_init ();
5865 relaxing_section = TRUE;
5866 if (!analyze_relocations (link_info))
5868 relocations_analyzed = TRUE;
5872 /* Don't mess with linker-created sections. */
5873 if ((sec->flags & SEC_LINKER_CREATED) != 0)
5876 relax_info = get_xtensa_relax_info (sec);
5877 BFD_ASSERT (relax_info != NULL);
5879 switch (relax_info->visited)
5882 /* Note: It would be nice to fold this pass into
5883 analyze_relocations, but it is important for this step that the
5884 sections be examined in link order. */
5885 if (!compute_removed_literals (abfd, sec, link_info, values))
5892 value_map_hash_table_delete (values);
5894 if (!relax_section (abfd, sec, link_info))
5900 if (!relax_section_symbols (abfd, sec))
5905 relax_info->visited++;
5910 /* Initialization for relaxation. */
5912 /* This function is called once at the start of relaxation. It scans
5913 all the input sections and marks the ones that are relaxable (i.e.,
5914 literal sections with L32R relocations against them), and then
5915 collects source_reloc information for all the relocations against
5916 those relaxable sections. During this process, it also detects
5917 longcalls, i.e., calls relaxed by the assembler into indirect
5918 calls, that can be optimized back into direct calls. Within each
5919 extended basic block (ebb) containing an optimized longcall, it
5920 computes a set of "text actions" that can be performed to remove
5921 the L32R associated with the longcall while optionally preserving
5922 branch target alignments. */
5925 analyze_relocations (struct bfd_link_info *link_info)
5929 bfd_boolean is_relaxable = FALSE;
5931 /* Initialize the per-section relaxation info. */
5932 for (abfd = link_info->input_bfds; abfd != NULL; abfd = abfd->link_next)
5933 for (sec = abfd->sections; sec != NULL; sec = sec->next)
5935 init_xtensa_relax_info (sec);
5938 /* Mark relaxable sections (and count relocations against each one). */
5939 for (abfd = link_info->input_bfds; abfd != NULL; abfd = abfd->link_next)
5940 for (sec = abfd->sections; sec != NULL; sec = sec->next)
5942 if (!find_relaxable_sections (abfd, sec, link_info, &is_relaxable))
5946 /* Bail out if there are no relaxable sections. */
5950 /* Allocate space for source_relocs. */
5951 for (abfd = link_info->input_bfds; abfd != NULL; abfd = abfd->link_next)
5952 for (sec = abfd->sections; sec != NULL; sec = sec->next)
5954 xtensa_relax_info *relax_info;
5956 relax_info = get_xtensa_relax_info (sec);
5957 if (relax_info->is_relaxable_literal_section
5958 || relax_info->is_relaxable_asm_section)
5960 relax_info->src_relocs = (source_reloc *)
5961 bfd_malloc (relax_info->src_count * sizeof (source_reloc));
5964 relax_info->src_count = 0;
5967 /* Collect info on relocations against each relaxable section. */
5968 for (abfd = link_info->input_bfds; abfd != NULL; abfd = abfd->link_next)
5969 for (sec = abfd->sections; sec != NULL; sec = sec->next)
5971 if (!collect_source_relocs (abfd, sec, link_info))
5975 /* Compute the text actions. */
5976 for (abfd = link_info->input_bfds; abfd != NULL; abfd = abfd->link_next)
5977 for (sec = abfd->sections; sec != NULL; sec = sec->next)
5979 if (!compute_text_actions (abfd, sec, link_info))
5987 /* Find all the sections that might be relaxed. The motivation for
5988 this pass is that collect_source_relocs() needs to record _all_ the
5989 relocations that target each relaxable section. That is expensive
5990 and unnecessary unless the target section is actually going to be
5991 relaxed. This pass identifies all such sections by checking if
5992 they have L32Rs pointing to them. In the process, the total number
5993 of relocations targeting each section is also counted so that we
5994 know how much space to allocate for source_relocs against each
5995 relaxable literal section. */
5998 find_relaxable_sections (bfd *abfd,
6000 struct bfd_link_info *link_info,
6001 bfd_boolean *is_relaxable_p)
6003 Elf_Internal_Rela *internal_relocs;
6005 bfd_boolean ok = TRUE;
6007 xtensa_relax_info *source_relax_info;
6008 bfd_boolean is_l32r_reloc;
6010 internal_relocs = retrieve_internal_relocs (abfd, sec,
6011 link_info->keep_memory);
6012 if (internal_relocs == NULL)
6015 contents = retrieve_contents (abfd, sec, link_info->keep_memory);
6016 if (contents == NULL && sec->size != 0)
6022 source_relax_info = get_xtensa_relax_info (sec);
6023 for (i = 0; i < sec->reloc_count; i++)
6025 Elf_Internal_Rela *irel = &internal_relocs[i];
6027 asection *target_sec;
6028 xtensa_relax_info *target_relax_info;
6030 /* If this section has not already been marked as "relaxable", and
6031 if it contains any ASM_EXPAND relocations (marking expanded
6032 longcalls) that can be optimized into direct calls, then mark
6033 the section as "relaxable". */
6034 if (source_relax_info
6035 && !source_relax_info->is_relaxable_asm_section
6036 && ELF32_R_TYPE (irel->r_info) == R_XTENSA_ASM_EXPAND)
6038 bfd_boolean is_reachable = FALSE;
6039 if (is_resolvable_asm_expansion (abfd, sec, contents, irel,
6040 link_info, &is_reachable)
6043 source_relax_info->is_relaxable_asm_section = TRUE;
6044 *is_relaxable_p = TRUE;
6048 r_reloc_init (&r_rel, abfd, irel, contents,
6049 bfd_get_section_limit (abfd, sec));
6051 target_sec = r_reloc_get_section (&r_rel);
6052 target_relax_info = get_xtensa_relax_info (target_sec);
6053 if (!target_relax_info)
6056 /* Count PC-relative operand relocations against the target section.
6057 Note: The conditions tested here must match the conditions under
6058 which init_source_reloc is called in collect_source_relocs(). */
6059 is_l32r_reloc = FALSE;
6060 if (is_operand_relocation (ELF32_R_TYPE (irel->r_info)))
6062 xtensa_opcode opcode =
6063 get_relocation_opcode (abfd, sec, contents, irel);
6064 if (opcode != XTENSA_UNDEFINED)
6066 is_l32r_reloc = (opcode == get_l32r_opcode ());
6067 if (!is_alt_relocation (ELF32_R_TYPE (irel->r_info))
6069 target_relax_info->src_count++;
6073 if (is_l32r_reloc && r_reloc_is_defined (&r_rel))
6075 /* Mark the target section as relaxable. */
6076 target_relax_info->is_relaxable_literal_section = TRUE;
6077 *is_relaxable_p = TRUE;
6082 release_contents (sec, contents);
6083 release_internal_relocs (sec, internal_relocs);
6088 /* Record _all_ the relocations that point to relaxable sections, and
6089 get rid of ASM_EXPAND relocs by either converting them to
6090 ASM_SIMPLIFY or by removing them. */
6093 collect_source_relocs (bfd *abfd,
6095 struct bfd_link_info *link_info)
6097 Elf_Internal_Rela *internal_relocs;
6099 bfd_boolean ok = TRUE;
6101 bfd_size_type sec_size;
6103 internal_relocs = retrieve_internal_relocs (abfd, sec,
6104 link_info->keep_memory);
6105 if (internal_relocs == NULL)
6108 sec_size = bfd_get_section_limit (abfd, sec);
6109 contents = retrieve_contents (abfd, sec, link_info->keep_memory);
6110 if (contents == NULL && sec_size != 0)
6116 /* Record relocations against relaxable literal sections. */
6117 for (i = 0; i < sec->reloc_count; i++)
6119 Elf_Internal_Rela *irel = &internal_relocs[i];
6121 asection *target_sec;
6122 xtensa_relax_info *target_relax_info;
6124 r_reloc_init (&r_rel, abfd, irel, contents, sec_size);
6126 target_sec = r_reloc_get_section (&r_rel);
6127 target_relax_info = get_xtensa_relax_info (target_sec);
6129 if (target_relax_info
6130 && (target_relax_info->is_relaxable_literal_section
6131 || target_relax_info->is_relaxable_asm_section))
6133 xtensa_opcode opcode = XTENSA_UNDEFINED;
6135 bfd_boolean is_abs_literal = FALSE;
6137 if (is_alt_relocation (ELF32_R_TYPE (irel->r_info)))
6139 /* None of the current alternate relocs are PC-relative,
6140 and only PC-relative relocs matter here. However, we
6141 still need to record the opcode for literal
6143 opcode = get_relocation_opcode (abfd, sec, contents, irel);
6144 if (opcode == get_l32r_opcode ())
6146 is_abs_literal = TRUE;
6150 opcode = XTENSA_UNDEFINED;
6152 else if (is_operand_relocation (ELF32_R_TYPE (irel->r_info)))
6154 opcode = get_relocation_opcode (abfd, sec, contents, irel);
6155 opnd = get_relocation_opnd (opcode, ELF32_R_TYPE (irel->r_info));
6158 if (opcode != XTENSA_UNDEFINED)
6160 int src_next = target_relax_info->src_next++;
6161 source_reloc *s_reloc = &target_relax_info->src_relocs[src_next];
6163 init_source_reloc (s_reloc, sec, &r_rel, opcode, opnd,
6169 /* Now get rid of ASM_EXPAND relocations. At this point, the
6170 src_relocs array for the target literal section may still be
6171 incomplete, but it must at least contain the entries for the L32R
6172 relocations associated with ASM_EXPANDs because they were just
6173 added in the preceding loop over the relocations. */
6175 for (i = 0; i < sec->reloc_count; i++)
6177 Elf_Internal_Rela *irel = &internal_relocs[i];
6178 bfd_boolean is_reachable;
6180 if (!is_resolvable_asm_expansion (abfd, sec, contents, irel, link_info,
6186 Elf_Internal_Rela *l32r_irel;
6188 asection *target_sec;
6189 xtensa_relax_info *target_relax_info;
6191 /* Mark the source_reloc for the L32R so that it will be
6192 removed in compute_removed_literals(), along with the
6193 associated literal. */
6194 l32r_irel = find_associated_l32r_irel (abfd, sec, contents,
6195 irel, internal_relocs);
6196 if (l32r_irel == NULL)
6199 r_reloc_init (&r_rel, abfd, l32r_irel, contents, sec_size);
6201 target_sec = r_reloc_get_section (&r_rel);
6202 target_relax_info = get_xtensa_relax_info (target_sec);
6204 if (target_relax_info
6205 && (target_relax_info->is_relaxable_literal_section
6206 || target_relax_info->is_relaxable_asm_section))
6208 source_reloc *s_reloc;
6210 /* Search the source_relocs for the entry corresponding to
6211 the l32r_irel. Note: The src_relocs array is not yet
6212 sorted, but it wouldn't matter anyway because we're
6213 searching by source offset instead of target offset. */
6214 s_reloc = find_source_reloc (target_relax_info->src_relocs,
6215 target_relax_info->src_next,
6217 BFD_ASSERT (s_reloc);
6218 s_reloc->is_null = TRUE;
6221 /* Convert this reloc to ASM_SIMPLIFY. */
6222 irel->r_info = ELF32_R_INFO (ELF32_R_SYM (irel->r_info),
6223 R_XTENSA_ASM_SIMPLIFY);
6224 l32r_irel->r_info = ELF32_R_INFO (0, R_XTENSA_NONE);
6226 pin_internal_relocs (sec, internal_relocs);
6230 /* It is resolvable but doesn't reach. We resolve now
6231 by eliminating the relocation -- the call will remain
6232 expanded into L32R/CALLX. */
6233 irel->r_info = ELF32_R_INFO (0, R_XTENSA_NONE);
6234 pin_internal_relocs (sec, internal_relocs);
6239 release_contents (sec, contents);
6240 release_internal_relocs (sec, internal_relocs);
6245 /* Return TRUE if the asm expansion can be resolved. Generally it can
6246 be resolved on a final link or when a partial link locates it in the
6247 same section as the target. Set "is_reachable" flag if the target of
6248 the call is within the range of a direct call, given the current VMA
6249 for this section and the target section. */
6252 is_resolvable_asm_expansion (bfd *abfd,
6255 Elf_Internal_Rela *irel,
6256 struct bfd_link_info *link_info,
6257 bfd_boolean *is_reachable_p)
6259 asection *target_sec;
6260 bfd_vma target_offset;
6262 xtensa_opcode opcode, direct_call_opcode;
6263 bfd_vma self_address;
6264 bfd_vma dest_address;
6265 bfd_boolean uses_l32r;
6266 bfd_size_type sec_size;
6268 *is_reachable_p = FALSE;
6270 if (contents == NULL)
6273 if (ELF32_R_TYPE (irel->r_info) != R_XTENSA_ASM_EXPAND)
6276 sec_size = bfd_get_section_limit (abfd, sec);
6277 opcode = get_expanded_call_opcode (contents + irel->r_offset,
6278 sec_size - irel->r_offset, &uses_l32r);
6279 /* Optimization of longcalls that use CONST16 is not yet implemented. */
6283 direct_call_opcode = swap_callx_for_call_opcode (opcode);
6284 if (direct_call_opcode == XTENSA_UNDEFINED)
6287 /* Check and see that the target resolves. */
6288 r_reloc_init (&r_rel, abfd, irel, contents, sec_size);
6289 if (!r_reloc_is_defined (&r_rel))
6292 target_sec = r_reloc_get_section (&r_rel);
6293 target_offset = r_rel.target_offset;
6295 /* If the target is in a shared library, then it doesn't reach. This
6296 isn't supposed to come up because the compiler should never generate
6297 non-PIC calls on systems that use shared libraries, but the linker
6298 shouldn't crash regardless. */
6299 if (!target_sec->output_section)
6302 /* For relocatable sections, we can only simplify when the output
6303 section of the target is the same as the output section of the
6305 if (link_info->relocatable
6306 && (target_sec->output_section != sec->output_section
6307 || is_reloc_sym_weak (abfd, irel)))
6310 self_address = (sec->output_section->vma
6311 + sec->output_offset + irel->r_offset + 3);
6312 dest_address = (target_sec->output_section->vma
6313 + target_sec->output_offset + target_offset);
6315 *is_reachable_p = pcrel_reloc_fits (direct_call_opcode, 0,
6316 self_address, dest_address);
6318 if ((self_address >> CALL_SEGMENT_BITS) !=
6319 (dest_address >> CALL_SEGMENT_BITS))
6326 static Elf_Internal_Rela *
6327 find_associated_l32r_irel (bfd *abfd,
6330 Elf_Internal_Rela *other_irel,
6331 Elf_Internal_Rela *internal_relocs)
6335 for (i = 0; i < sec->reloc_count; i++)
6337 Elf_Internal_Rela *irel = &internal_relocs[i];
6339 if (irel == other_irel)
6341 if (irel->r_offset != other_irel->r_offset)
6343 if (is_l32r_relocation (abfd, sec, contents, irel))
6351 static xtensa_opcode *
6352 build_reloc_opcodes (bfd *abfd,
6355 Elf_Internal_Rela *internal_relocs)
6358 xtensa_opcode *reloc_opcodes =
6359 (xtensa_opcode *) bfd_malloc (sizeof (xtensa_opcode) * sec->reloc_count);
6360 for (i = 0; i < sec->reloc_count; i++)
6362 Elf_Internal_Rela *irel = &internal_relocs[i];
6363 reloc_opcodes[i] = get_relocation_opcode (abfd, sec, contents, irel);
6365 return reloc_opcodes;
6369 /* The compute_text_actions function will build a list of potential
6370 transformation actions for code in the extended basic block of each
6371 longcall that is optimized to a direct call. From this list we
6372 generate a set of actions to actually perform that optimizes for
6373 space and, if not using size_opt, maintains branch target
6376 These actions to be performed are placed on a per-section list.
6377 The actual changes are performed by relax_section() in the second
6381 compute_text_actions (bfd *abfd,
6383 struct bfd_link_info *link_info)
6385 xtensa_opcode *reloc_opcodes = NULL;
6386 xtensa_relax_info *relax_info;
6388 Elf_Internal_Rela *internal_relocs;
6389 bfd_boolean ok = TRUE;
6391 property_table_entry *prop_table = 0;
6393 bfd_size_type sec_size;
6395 relax_info = get_xtensa_relax_info (sec);
6396 BFD_ASSERT (relax_info);
6397 BFD_ASSERT (relax_info->src_next == relax_info->src_count);
6399 /* Do nothing if the section contains no optimized longcalls. */
6400 if (!relax_info->is_relaxable_asm_section)
6403 internal_relocs = retrieve_internal_relocs (abfd, sec,
6404 link_info->keep_memory);
6406 if (internal_relocs)
6407 qsort (internal_relocs, sec->reloc_count, sizeof (Elf_Internal_Rela),
6408 internal_reloc_compare);
6410 sec_size = bfd_get_section_limit (abfd, sec);
6411 contents = retrieve_contents (abfd, sec, link_info->keep_memory);
6412 if (contents == NULL && sec_size != 0)
6418 ptblsize = xtensa_read_table_entries (abfd, sec, &prop_table,
6419 XTENSA_PROP_SEC_NAME, FALSE);
6426 for (i = 0; i < sec->reloc_count; i++)
6428 Elf_Internal_Rela *irel = &internal_relocs[i];
6430 property_table_entry *the_entry;
6433 ebb_constraint ebb_table;
6434 bfd_size_type simplify_size;
6436 if (irel && ELF32_R_TYPE (irel->r_info) != R_XTENSA_ASM_SIMPLIFY)
6438 r_offset = irel->r_offset;
6440 simplify_size = get_asm_simplify_size (contents, sec_size, r_offset);
6441 if (simplify_size == 0)
6443 (*_bfd_error_handler)
6444 (_("%B(%A+0x%lx): could not decode instruction for XTENSA_ASM_SIMPLIFY relocation; possible configuration mismatch"),
6445 sec->owner, sec, r_offset);
6449 /* If the instruction table is not around, then don't do this
6451 the_entry = elf_xtensa_find_property_entry (prop_table, ptblsize,
6452 sec->vma + irel->r_offset);
6453 if (the_entry == NULL || XTENSA_NO_NOP_REMOVAL)
6455 text_action_add (&relax_info->action_list,
6456 ta_convert_longcall, sec, r_offset,
6461 /* If the next longcall happens to be at the same address as an
6462 unreachable section of size 0, then skip forward. */
6463 ptbl_idx = the_entry - prop_table;
6464 while ((the_entry->flags & XTENSA_PROP_UNREACHABLE)
6465 && the_entry->size == 0
6466 && ptbl_idx + 1 < ptblsize
6467 && (prop_table[ptbl_idx + 1].address
6468 == prop_table[ptbl_idx].address))
6474 if (the_entry->flags & XTENSA_PROP_NO_TRANSFORM)
6475 /* NO_REORDER is OK */
6478 init_ebb_constraint (&ebb_table);
6479 ebb = &ebb_table.ebb;
6480 init_ebb (ebb, sec, contents, sec_size, prop_table, ptblsize,
6481 internal_relocs, sec->reloc_count);
6482 ebb->start_offset = r_offset + simplify_size;
6483 ebb->end_offset = r_offset + simplify_size;
6484 ebb->start_ptbl_idx = ptbl_idx;
6485 ebb->end_ptbl_idx = ptbl_idx;
6486 ebb->start_reloc_idx = i;
6487 ebb->end_reloc_idx = i;
6489 /* Precompute the opcode for each relocation. */
6490 if (reloc_opcodes == NULL)
6491 reloc_opcodes = build_reloc_opcodes (abfd, sec, contents,
6494 if (!extend_ebb_bounds (ebb)
6495 || !compute_ebb_proposed_actions (&ebb_table)
6496 || !compute_ebb_actions (&ebb_table)
6497 || !check_section_ebb_pcrels_fit (abfd, sec, contents,
6498 internal_relocs, &ebb_table,
6500 || !check_section_ebb_reduces (&ebb_table))
6502 /* If anything goes wrong or we get unlucky and something does
6503 not fit, with our plan because of expansion between
6504 critical branches, just convert to a NOP. */
6506 text_action_add (&relax_info->action_list,
6507 ta_convert_longcall, sec, r_offset, 0);
6508 i = ebb_table.ebb.end_reloc_idx;
6509 free_ebb_constraint (&ebb_table);
6513 text_action_add_proposed (&relax_info->action_list, &ebb_table, sec);
6515 /* Update the index so we do not go looking at the relocations
6516 we have already processed. */
6517 i = ebb_table.ebb.end_reloc_idx;
6518 free_ebb_constraint (&ebb_table);
6522 if (relax_info->action_list.head)
6523 print_action_list (stderr, &relax_info->action_list);
6527 release_contents (sec, contents);
6528 release_internal_relocs (sec, internal_relocs);
6532 free (reloc_opcodes);
6538 /* Do not widen an instruction if it is preceeded by a
6539 loop opcode. It might cause misalignment. */
6542 prev_instr_is_a_loop (bfd_byte *contents,
6543 bfd_size_type content_length,
6544 bfd_size_type offset)
6546 xtensa_opcode prev_opcode;
6550 prev_opcode = insn_decode_opcode (contents, content_length, offset-3, 0);
6551 return (xtensa_opcode_is_loop (xtensa_default_isa, prev_opcode) == 1);
6555 /* Find all of the possible actions for an extended basic block. */
6558 compute_ebb_proposed_actions (ebb_constraint *ebb_table)
6560 const ebb_t *ebb = &ebb_table->ebb;
6561 unsigned rel_idx = ebb->start_reloc_idx;
6562 property_table_entry *entry, *start_entry, *end_entry;
6564 xtensa_isa isa = xtensa_default_isa;
6566 static xtensa_insnbuf insnbuf = NULL;
6567 static xtensa_insnbuf slotbuf = NULL;
6569 if (insnbuf == NULL)
6571 insnbuf = xtensa_insnbuf_alloc (isa);
6572 slotbuf = xtensa_insnbuf_alloc (isa);
6575 start_entry = &ebb->ptbl[ebb->start_ptbl_idx];
6576 end_entry = &ebb->ptbl[ebb->end_ptbl_idx];
6578 for (entry = start_entry; entry <= end_entry; entry++)
6580 bfd_vma start_offset, end_offset;
6581 bfd_size_type insn_len;
6583 start_offset = entry->address - ebb->sec->vma;
6584 end_offset = entry->address + entry->size - ebb->sec->vma;
6586 if (entry == start_entry)
6587 start_offset = ebb->start_offset;
6588 if (entry == end_entry)
6589 end_offset = ebb->end_offset;
6590 offset = start_offset;
6592 if (offset == entry->address - ebb->sec->vma
6593 && (entry->flags & XTENSA_PROP_INSN_BRANCH_TARGET) != 0)
6595 enum ebb_target_enum align_type = EBB_DESIRE_TGT_ALIGN;
6596 BFD_ASSERT (offset != end_offset);
6597 if (offset == end_offset)
6600 insn_len = insn_decode_len (ebb->contents, ebb->content_length,
6605 if (check_branch_target_aligned_address (offset, insn_len))
6606 align_type = EBB_REQUIRE_TGT_ALIGN;
6608 ebb_propose_action (ebb_table, align_type, 0,
6609 ta_none, offset, 0, TRUE);
6612 while (offset != end_offset)
6614 Elf_Internal_Rela *irel;
6615 xtensa_opcode opcode;
6617 while (rel_idx < ebb->end_reloc_idx
6618 && (ebb->relocs[rel_idx].r_offset < offset
6619 || (ebb->relocs[rel_idx].r_offset == offset
6620 && (ELF32_R_TYPE (ebb->relocs[rel_idx].r_info)
6621 != R_XTENSA_ASM_SIMPLIFY))))
6624 /* Check for longcall. */
6625 irel = &ebb->relocs[rel_idx];
6626 if (irel->r_offset == offset
6627 && ELF32_R_TYPE (irel->r_info) == R_XTENSA_ASM_SIMPLIFY)
6629 bfd_size_type simplify_size;
6631 simplify_size = get_asm_simplify_size (ebb->contents,
6632 ebb->content_length,
6634 if (simplify_size == 0)
6637 ebb_propose_action (ebb_table, EBB_NO_ALIGN, 0,
6638 ta_convert_longcall, offset, 0, TRUE);
6640 offset += simplify_size;
6644 if (offset + MIN_INSN_LENGTH > ebb->content_length)
6646 xtensa_insnbuf_from_chars (isa, insnbuf, &ebb->contents[offset],
6647 ebb->content_length - offset);
6648 fmt = xtensa_format_decode (isa, insnbuf);
6649 if (fmt == XTENSA_UNDEFINED)
6651 insn_len = xtensa_format_length (isa, fmt);
6652 if (insn_len == (bfd_size_type) XTENSA_UNDEFINED)
6655 if (xtensa_format_num_slots (isa, fmt) != 1)
6661 xtensa_format_get_slot (isa, fmt, 0, insnbuf, slotbuf);
6662 opcode = xtensa_opcode_decode (isa, fmt, 0, slotbuf);
6663 if (opcode == XTENSA_UNDEFINED)
6666 if ((entry->flags & XTENSA_PROP_INSN_NO_DENSITY) == 0
6667 && (entry->flags & XTENSA_PROP_NO_TRANSFORM) == 0
6668 && can_narrow_instruction (slotbuf, fmt, opcode) != 0)
6670 /* Add an instruction narrow action. */
6671 ebb_propose_action (ebb_table, EBB_NO_ALIGN, 0,
6672 ta_narrow_insn, offset, 0, FALSE);
6674 else if ((entry->flags & XTENSA_PROP_NO_TRANSFORM) == 0
6675 && can_widen_instruction (slotbuf, fmt, opcode) != 0
6676 && ! prev_instr_is_a_loop (ebb->contents,
6677 ebb->content_length, offset))
6679 /* Add an instruction widen action. */
6680 ebb_propose_action (ebb_table, EBB_NO_ALIGN, 0,
6681 ta_widen_insn, offset, 0, FALSE);
6683 else if (xtensa_opcode_is_loop (xtensa_default_isa, opcode) == 1)
6685 /* Check for branch targets. */
6686 ebb_propose_action (ebb_table, EBB_REQUIRE_LOOP_ALIGN, 0,
6687 ta_none, offset, 0, TRUE);
6694 if (ebb->ends_unreachable)
6696 ebb_propose_action (ebb_table, EBB_NO_ALIGN, 0,
6697 ta_fill, ebb->end_offset, 0, TRUE);
6703 (*_bfd_error_handler)
6704 (_("%B(%A+0x%lx): could not decode instruction; possible configuration mismatch"),
6705 ebb->sec->owner, ebb->sec, offset);
6710 /* After all of the information has collected about the
6711 transformations possible in an EBB, compute the appropriate actions
6712 here in compute_ebb_actions. We still must check later to make
6713 sure that the actions do not break any relocations. The algorithm
6714 used here is pretty greedy. Basically, it removes as many no-ops
6715 as possible so that the end of the EBB has the same alignment
6716 characteristics as the original. First, it uses narrowing, then
6717 fill space at the end of the EBB, and finally widenings. If that
6718 does not work, it tries again with one fewer no-op removed. The
6719 optimization will only be performed if all of the branch targets
6720 that were aligned before transformation are also aligned after the
6723 When the size_opt flag is set, ignore the branch target alignments,
6724 narrow all wide instructions, and remove all no-ops unless the end
6725 of the EBB prevents it. */
6728 compute_ebb_actions (ebb_constraint *ebb_table)
6732 int removed_bytes = 0;
6733 ebb_t *ebb = &ebb_table->ebb;
6734 unsigned seg_idx_start = 0;
6735 unsigned seg_idx_end = 0;
6737 /* We perform this like the assembler relaxation algorithm: Start by
6738 assuming all instructions are narrow and all no-ops removed; then
6741 /* For each segment of this that has a solid constraint, check to
6742 see if there are any combinations that will keep the constraint.
6744 for (seg_idx_end = 0; seg_idx_end < ebb_table->action_count; seg_idx_end++)
6746 bfd_boolean requires_text_end_align = FALSE;
6747 unsigned longcall_count = 0;
6748 unsigned longcall_convert_count = 0;
6749 unsigned narrowable_count = 0;
6750 unsigned narrowable_convert_count = 0;
6751 unsigned widenable_count = 0;
6752 unsigned widenable_convert_count = 0;
6754 proposed_action *action = NULL;
6755 int align = (1 << ebb_table->ebb.sec->alignment_power);
6757 seg_idx_start = seg_idx_end;
6759 for (i = seg_idx_start; i < ebb_table->action_count; i++)
6761 action = &ebb_table->actions[i];
6762 if (action->action == ta_convert_longcall)
6764 if (action->action == ta_narrow_insn)
6766 if (action->action == ta_widen_insn)
6768 if (action->action == ta_fill)
6770 if (action->align_type == EBB_REQUIRE_LOOP_ALIGN)
6772 if (action->align_type == EBB_REQUIRE_TGT_ALIGN
6773 && !elf32xtensa_size_opt)
6778 if (seg_idx_end == ebb_table->action_count && !ebb->ends_unreachable)
6779 requires_text_end_align = TRUE;
6781 if (elf32xtensa_size_opt && !requires_text_end_align
6782 && action->align_type != EBB_REQUIRE_LOOP_ALIGN
6783 && action->align_type != EBB_REQUIRE_TGT_ALIGN)
6785 longcall_convert_count = longcall_count;
6786 narrowable_convert_count = narrowable_count;
6787 widenable_convert_count = 0;
6791 /* There is a constraint. Convert the max number of longcalls. */
6792 narrowable_convert_count = 0;
6793 longcall_convert_count = 0;
6794 widenable_convert_count = 0;
6796 for (j = 0; j < longcall_count; j++)
6798 int removed = (longcall_count - j) * 3 & (align - 1);
6799 unsigned desire_narrow = (align - removed) & (align - 1);
6800 unsigned desire_widen = removed;
6801 if (desire_narrow <= narrowable_count)
6803 narrowable_convert_count = desire_narrow;
6804 narrowable_convert_count +=
6805 (align * ((narrowable_count - narrowable_convert_count)
6807 longcall_convert_count = (longcall_count - j);
6808 widenable_convert_count = 0;
6811 if (desire_widen <= widenable_count && !elf32xtensa_size_opt)
6813 narrowable_convert_count = 0;
6814 longcall_convert_count = longcall_count - j;
6815 widenable_convert_count = desire_widen;
6821 /* Now the number of conversions are saved. Do them. */
6822 for (i = seg_idx_start; i < seg_idx_end; i++)
6824 action = &ebb_table->actions[i];
6825 switch (action->action)
6827 case ta_convert_longcall:
6828 if (longcall_convert_count != 0)
6830 action->action = ta_remove_longcall;
6831 action->do_action = TRUE;
6832 action->removed_bytes += 3;
6833 longcall_convert_count--;
6836 case ta_narrow_insn:
6837 if (narrowable_convert_count != 0)
6839 action->do_action = TRUE;
6840 action->removed_bytes += 1;
6841 narrowable_convert_count--;
6845 if (widenable_convert_count != 0)
6847 action->do_action = TRUE;
6848 action->removed_bytes -= 1;
6849 widenable_convert_count--;
6858 /* Now we move on to some local opts. Try to remove each of the
6859 remaining longcalls. */
6861 if (ebb_table->ebb.ends_section || ebb_table->ebb.ends_unreachable)
6864 for (i = 0; i < ebb_table->action_count; i++)
6866 int old_removed_bytes = removed_bytes;
6867 proposed_action *action = &ebb_table->actions[i];
6869 if (action->do_action && action->action == ta_convert_longcall)
6871 bfd_boolean bad_alignment = FALSE;
6873 for (j = i + 1; j < ebb_table->action_count; j++)
6875 proposed_action *new_action = &ebb_table->actions[j];
6876 bfd_vma offset = new_action->offset;
6877 if (new_action->align_type == EBB_REQUIRE_TGT_ALIGN)
6879 if (!check_branch_target_aligned
6880 (ebb_table->ebb.contents,
6881 ebb_table->ebb.content_length,
6882 offset, offset - removed_bytes))
6884 bad_alignment = TRUE;
6888 if (new_action->align_type == EBB_REQUIRE_LOOP_ALIGN)
6890 if (!check_loop_aligned (ebb_table->ebb.contents,
6891 ebb_table->ebb.content_length,
6893 offset - removed_bytes))
6895 bad_alignment = TRUE;
6899 if (new_action->action == ta_narrow_insn
6900 && !new_action->do_action
6901 && ebb_table->ebb.sec->alignment_power == 2)
6903 /* Narrow an instruction and we are done. */
6904 new_action->do_action = TRUE;
6905 new_action->removed_bytes += 1;
6906 bad_alignment = FALSE;
6909 if (new_action->action == ta_widen_insn
6910 && new_action->do_action
6911 && ebb_table->ebb.sec->alignment_power == 2)
6913 /* Narrow an instruction and we are done. */
6914 new_action->do_action = FALSE;
6915 new_action->removed_bytes += 1;
6916 bad_alignment = FALSE;
6919 if (new_action->do_action)
6920 removed_bytes += new_action->removed_bytes;
6924 action->removed_bytes += 3;
6925 action->action = ta_remove_longcall;
6926 action->do_action = TRUE;
6929 removed_bytes = old_removed_bytes;
6930 if (action->do_action)
6931 removed_bytes += action->removed_bytes;
6936 for (i = 0; i < ebb_table->action_count; ++i)
6938 proposed_action *action = &ebb_table->actions[i];
6939 if (action->do_action)
6940 removed_bytes += action->removed_bytes;
6943 if ((removed_bytes % (1 << ebb_table->ebb.sec->alignment_power)) != 0
6944 && ebb->ends_unreachable)
6946 proposed_action *action;
6950 BFD_ASSERT (ebb_table->action_count != 0);
6951 action = &ebb_table->actions[ebb_table->action_count - 1];
6952 BFD_ASSERT (action->action == ta_fill);
6953 BFD_ASSERT (ebb->ends_unreachable->flags & XTENSA_PROP_UNREACHABLE);
6955 extra_space = compute_fill_extra_space (ebb->ends_unreachable);
6956 br = action->removed_bytes + removed_bytes + extra_space;
6957 br = br & ((1 << ebb->sec->alignment_power ) - 1);
6959 action->removed_bytes = extra_space - br;
6965 /* The xlate_map is a sorted array of address mappings designed to
6966 answer the offset_with_removed_text() query with a binary search instead
6967 of a linear search through the section's action_list. */
6969 typedef struct xlate_map_entry xlate_map_entry_t;
6970 typedef struct xlate_map xlate_map_t;
6972 struct xlate_map_entry
6974 unsigned orig_address;
6975 unsigned new_address;
6981 unsigned entry_count;
6982 xlate_map_entry_t *entry;
6987 xlate_compare (const void *a_v, const void *b_v)
6989 const xlate_map_entry_t *a = (const xlate_map_entry_t *) a_v;
6990 const xlate_map_entry_t *b = (const xlate_map_entry_t *) b_v;
6991 if (a->orig_address < b->orig_address)
6993 if (a->orig_address > (b->orig_address + b->size - 1))
7000 xlate_offset_with_removed_text (const xlate_map_t *map,
7001 text_action_list *action_list,
7004 xlate_map_entry_t tmp;
7006 xlate_map_entry_t *e;
7009 return offset_with_removed_text (action_list, offset);
7011 if (map->entry_count == 0)
7014 tmp.orig_address = offset;
7015 tmp.new_address = offset;
7018 r = bsearch (&offset, map->entry, map->entry_count,
7019 sizeof (xlate_map_entry_t), &xlate_compare);
7020 e = (xlate_map_entry_t *) r;
7022 BFD_ASSERT (e != NULL);
7025 return e->new_address - e->orig_address + offset;
7029 /* Build a binary searchable offset translation map from a section's
7032 static xlate_map_t *
7033 build_xlate_map (asection *sec, xtensa_relax_info *relax_info)
7035 xlate_map_t *map = (xlate_map_t *) bfd_malloc (sizeof (xlate_map_t));
7036 text_action_list *action_list = &relax_info->action_list;
7037 unsigned num_actions = 0;
7040 xlate_map_entry_t *current_entry;
7045 num_actions = action_list_count (action_list);
7046 map->entry = (xlate_map_entry_t *)
7047 bfd_malloc (sizeof (xlate_map_entry_t) * (num_actions + 1));
7048 if (map->entry == NULL)
7053 map->entry_count = 0;
7056 current_entry = &map->entry[0];
7058 current_entry->orig_address = 0;
7059 current_entry->new_address = 0;
7060 current_entry->size = 0;
7062 for (r = action_list->head; r != NULL; r = r->next)
7064 unsigned orig_size = 0;
7068 case ta_remove_insn:
7069 case ta_convert_longcall:
7070 case ta_remove_literal:
7071 case ta_add_literal:
7073 case ta_remove_longcall:
7076 case ta_narrow_insn:
7085 current_entry->size =
7086 r->offset + orig_size - current_entry->orig_address;
7087 if (current_entry->size != 0)
7092 current_entry->orig_address = r->offset + orig_size;
7093 removed += r->removed_bytes;
7094 current_entry->new_address = r->offset + orig_size - removed;
7095 current_entry->size = 0;
7098 current_entry->size = (bfd_get_section_limit (sec->owner, sec)
7099 - current_entry->orig_address);
7100 if (current_entry->size != 0)
7107 /* Free an offset translation map. */
7110 free_xlate_map (xlate_map_t *map)
7112 if (map && map->entry)
7119 /* Use check_section_ebb_pcrels_fit to make sure that all of the
7120 relocations in a section will fit if a proposed set of actions
7124 check_section_ebb_pcrels_fit (bfd *abfd,
7127 Elf_Internal_Rela *internal_relocs,
7128 const ebb_constraint *constraint,
7129 const xtensa_opcode *reloc_opcodes)
7132 Elf_Internal_Rela *irel;
7133 xlate_map_t *xmap = NULL;
7134 bfd_boolean ok = TRUE;
7135 xtensa_relax_info *relax_info;
7137 relax_info = get_xtensa_relax_info (sec);
7139 if (relax_info && sec->reloc_count > 100)
7141 xmap = build_xlate_map (sec, relax_info);
7142 /* NULL indicates out of memory, but the slow version
7143 can still be used. */
7146 for (i = 0; i < sec->reloc_count; i++)
7149 bfd_vma orig_self_offset, orig_target_offset;
7150 bfd_vma self_offset, target_offset;
7152 reloc_howto_type *howto;
7153 int self_removed_bytes, target_removed_bytes;
7155 irel = &internal_relocs[i];
7156 r_type = ELF32_R_TYPE (irel->r_info);
7158 howto = &elf_howto_table[r_type];
7159 /* We maintain the required invariant: PC-relative relocations
7160 that fit before linking must fit after linking. Thus we only
7161 need to deal with relocations to the same section that are
7163 if (r_type == R_XTENSA_ASM_SIMPLIFY
7164 || r_type == R_XTENSA_32_PCREL
7165 || !howto->pc_relative)
7168 r_reloc_init (&r_rel, abfd, irel, contents,
7169 bfd_get_section_limit (abfd, sec));
7171 if (r_reloc_get_section (&r_rel) != sec)
7174 orig_self_offset = irel->r_offset;
7175 orig_target_offset = r_rel.target_offset;
7177 self_offset = orig_self_offset;
7178 target_offset = orig_target_offset;
7183 xlate_offset_with_removed_text (xmap, &relax_info->action_list,
7186 xlate_offset_with_removed_text (xmap, &relax_info->action_list,
7187 orig_target_offset);
7190 self_removed_bytes = 0;
7191 target_removed_bytes = 0;
7193 for (j = 0; j < constraint->action_count; ++j)
7195 proposed_action *action = &constraint->actions[j];
7196 bfd_vma offset = action->offset;
7197 int removed_bytes = action->removed_bytes;
7198 if (offset < orig_self_offset
7199 || (offset == orig_self_offset && action->action == ta_fill
7200 && action->removed_bytes < 0))
7201 self_removed_bytes += removed_bytes;
7202 if (offset < orig_target_offset
7203 || (offset == orig_target_offset && action->action == ta_fill
7204 && action->removed_bytes < 0))
7205 target_removed_bytes += removed_bytes;
7207 self_offset -= self_removed_bytes;
7208 target_offset -= target_removed_bytes;
7210 /* Try to encode it. Get the operand and check. */
7211 if (is_alt_relocation (ELF32_R_TYPE (irel->r_info)))
7213 /* None of the current alternate relocs are PC-relative,
7214 and only PC-relative relocs matter here. */
7218 xtensa_opcode opcode;
7222 opcode = reloc_opcodes[i];
7224 opcode = get_relocation_opcode (abfd, sec, contents, irel);
7225 if (opcode == XTENSA_UNDEFINED)
7231 opnum = get_relocation_opnd (opcode, ELF32_R_TYPE (irel->r_info));
7232 if (opnum == XTENSA_UNDEFINED)
7238 if (!pcrel_reloc_fits (opcode, opnum, self_offset, target_offset))
7247 free_xlate_map (xmap);
7254 check_section_ebb_reduces (const ebb_constraint *constraint)
7259 for (i = 0; i < constraint->action_count; i++)
7261 const proposed_action *action = &constraint->actions[i];
7262 if (action->do_action)
7263 removed += action->removed_bytes;
7273 text_action_add_proposed (text_action_list *l,
7274 const ebb_constraint *ebb_table,
7279 for (i = 0; i < ebb_table->action_count; i++)
7281 proposed_action *action = &ebb_table->actions[i];
7283 if (!action->do_action)
7285 switch (action->action)
7287 case ta_remove_insn:
7288 case ta_remove_longcall:
7289 case ta_convert_longcall:
7290 case ta_narrow_insn:
7293 case ta_remove_literal:
7294 text_action_add (l, action->action, sec, action->offset,
7295 action->removed_bytes);
7308 compute_fill_extra_space (property_table_entry *entry)
7310 int fill_extra_space;
7315 if ((entry->flags & XTENSA_PROP_UNREACHABLE) == 0)
7318 fill_extra_space = entry->size;
7319 if ((entry->flags & XTENSA_PROP_ALIGN) != 0)
7321 /* Fill bytes for alignment:
7322 (2**n)-1 - (addr + (2**n)-1) & (2**n -1) */
7323 int pow = GET_XTENSA_PROP_ALIGNMENT (entry->flags);
7324 int nsm = (1 << pow) - 1;
7325 bfd_vma addr = entry->address + entry->size;
7326 bfd_vma align_fill = nsm - ((addr + nsm) & nsm);
7327 fill_extra_space += align_fill;
7329 return fill_extra_space;
7333 /* First relaxation pass. */
7335 /* If the section contains relaxable literals, check each literal to
7336 see if it has the same value as another literal that has already
7337 been seen, either in the current section or a previous one. If so,
7338 add an entry to the per-section list of removed literals. The
7339 actual changes are deferred until the next pass. */
7342 compute_removed_literals (bfd *abfd,
7344 struct bfd_link_info *link_info,
7345 value_map_hash_table *values)
7347 xtensa_relax_info *relax_info;
7349 Elf_Internal_Rela *internal_relocs;
7350 source_reloc *src_relocs, *rel;
7351 bfd_boolean ok = TRUE;
7352 property_table_entry *prop_table = NULL;
7355 bfd_boolean last_loc_is_prev = FALSE;
7356 bfd_vma last_target_offset = 0;
7357 section_cache_t target_sec_cache;
7358 bfd_size_type sec_size;
7360 init_section_cache (&target_sec_cache);
7362 /* Do nothing if it is not a relaxable literal section. */
7363 relax_info = get_xtensa_relax_info (sec);
7364 BFD_ASSERT (relax_info);
7365 if (!relax_info->is_relaxable_literal_section)
7368 internal_relocs = retrieve_internal_relocs (abfd, sec,
7369 link_info->keep_memory);
7371 sec_size = bfd_get_section_limit (abfd, sec);
7372 contents = retrieve_contents (abfd, sec, link_info->keep_memory);
7373 if (contents == NULL && sec_size != 0)
7379 /* Sort the source_relocs by target offset. */
7380 src_relocs = relax_info->src_relocs;
7381 qsort (src_relocs, relax_info->src_count,
7382 sizeof (source_reloc), source_reloc_compare);
7383 qsort (internal_relocs, sec->reloc_count, sizeof (Elf_Internal_Rela),
7384 internal_reloc_compare);
7386 ptblsize = xtensa_read_table_entries (abfd, sec, &prop_table,
7387 XTENSA_PROP_SEC_NAME, FALSE);
7395 for (i = 0; i < relax_info->src_count; i++)
7397 Elf_Internal_Rela *irel = NULL;
7399 rel = &src_relocs[i];
7400 if (get_l32r_opcode () != rel->opcode)
7402 irel = get_irel_at_offset (sec, internal_relocs,
7403 rel->r_rel.target_offset);
7405 /* If the relocation on this is not a simple R_XTENSA_32 or
7406 R_XTENSA_PLT then do not consider it. This may happen when
7407 the difference of two symbols is used in a literal. */
7408 if (irel && (ELF32_R_TYPE (irel->r_info) != R_XTENSA_32
7409 && ELF32_R_TYPE (irel->r_info) != R_XTENSA_PLT))
7412 /* If the target_offset for this relocation is the same as the
7413 previous relocation, then we've already considered whether the
7414 literal can be coalesced. Skip to the next one.... */
7415 if (i != 0 && prev_i != -1
7416 && src_relocs[i-1].r_rel.target_offset == rel->r_rel.target_offset)
7420 if (last_loc_is_prev &&
7421 last_target_offset + 4 != rel->r_rel.target_offset)
7422 last_loc_is_prev = FALSE;
7424 /* Check if the relocation was from an L32R that is being removed
7425 because a CALLX was converted to a direct CALL, and check if
7426 there are no other relocations to the literal. */
7427 if (is_removable_literal (rel, i, src_relocs, relax_info->src_count,
7428 sec, prop_table, ptblsize))
7430 if (!remove_dead_literal (abfd, sec, link_info, internal_relocs,
7431 irel, rel, prop_table, ptblsize))
7436 last_target_offset = rel->r_rel.target_offset;
7440 if (!identify_literal_placement (abfd, sec, contents, link_info,
7442 &last_loc_is_prev, irel,
7443 relax_info->src_count - i, rel,
7444 prop_table, ptblsize,
7445 &target_sec_cache, rel->is_abs_literal))
7450 last_target_offset = rel->r_rel.target_offset;
7454 print_removed_literals (stderr, &relax_info->removed_list);
7455 print_action_list (stderr, &relax_info->action_list);
7459 if (prop_table) free (prop_table);
7460 clear_section_cache (&target_sec_cache);
7462 release_contents (sec, contents);
7463 release_internal_relocs (sec, internal_relocs);
7468 static Elf_Internal_Rela *
7469 get_irel_at_offset (asection *sec,
7470 Elf_Internal_Rela *internal_relocs,
7474 Elf_Internal_Rela *irel;
7476 Elf_Internal_Rela key;
7478 if (!internal_relocs)
7481 key.r_offset = offset;
7482 irel = bsearch (&key, internal_relocs, sec->reloc_count,
7483 sizeof (Elf_Internal_Rela), internal_reloc_matches);
7487 /* bsearch does not guarantee which will be returned if there are
7488 multiple matches. We need the first that is not an alignment. */
7489 i = irel - internal_relocs;
7492 if (internal_relocs[i-1].r_offset != offset)
7496 for ( ; i < sec->reloc_count; i++)
7498 irel = &internal_relocs[i];
7499 r_type = ELF32_R_TYPE (irel->r_info);
7500 if (irel->r_offset == offset && r_type != R_XTENSA_NONE)
7509 is_removable_literal (const source_reloc *rel,
7511 const source_reloc *src_relocs,
7514 property_table_entry *prop_table,
7517 const source_reloc *curr_rel;
7518 property_table_entry *entry;
7523 entry = elf_xtensa_find_property_entry (prop_table, ptblsize,
7524 sec->vma + rel->r_rel.target_offset);
7525 if (entry && (entry->flags & XTENSA_PROP_NO_TRANSFORM))
7528 for (++i; i < src_count; ++i)
7530 curr_rel = &src_relocs[i];
7531 /* If all others have the same target offset.... */
7532 if (curr_rel->r_rel.target_offset != rel->r_rel.target_offset)
7535 if (!curr_rel->is_null
7536 && !xtensa_is_property_section (curr_rel->source_sec)
7537 && !(curr_rel->source_sec->flags & SEC_DEBUGGING))
7545 remove_dead_literal (bfd *abfd,
7547 struct bfd_link_info *link_info,
7548 Elf_Internal_Rela *internal_relocs,
7549 Elf_Internal_Rela *irel,
7551 property_table_entry *prop_table,
7554 property_table_entry *entry;
7555 xtensa_relax_info *relax_info;
7557 relax_info = get_xtensa_relax_info (sec);
7561 entry = elf_xtensa_find_property_entry (prop_table, ptblsize,
7562 sec->vma + rel->r_rel.target_offset);
7564 /* Mark the unused literal so that it will be removed. */
7565 add_removed_literal (&relax_info->removed_list, &rel->r_rel, NULL);
7567 text_action_add (&relax_info->action_list,
7568 ta_remove_literal, sec, rel->r_rel.target_offset, 4);
7570 /* If the section is 4-byte aligned, do not add fill. */
7571 if (sec->alignment_power > 2)
7573 int fill_extra_space;
7574 bfd_vma entry_sec_offset;
7576 property_table_entry *the_add_entry;
7580 entry_sec_offset = entry->address - sec->vma + entry->size;
7582 entry_sec_offset = rel->r_rel.target_offset + 4;
7584 /* If the literal range is at the end of the section,
7586 the_add_entry = elf_xtensa_find_property_entry (prop_table, ptblsize,
7588 fill_extra_space = compute_fill_extra_space (the_add_entry);
7590 fa = find_fill_action (&relax_info->action_list, sec, entry_sec_offset);
7591 removed_diff = compute_removed_action_diff (fa, sec, entry_sec_offset,
7592 -4, fill_extra_space);
7594 adjust_fill_action (fa, removed_diff);
7596 text_action_add (&relax_info->action_list,
7597 ta_fill, sec, entry_sec_offset, removed_diff);
7600 /* Zero out the relocation on this literal location. */
7603 if (elf_hash_table (link_info)->dynamic_sections_created)
7604 shrink_dynamic_reloc_sections (link_info, abfd, sec, irel);
7606 irel->r_info = ELF32_R_INFO (0, R_XTENSA_NONE);
7607 pin_internal_relocs (sec, internal_relocs);
7610 /* Do not modify "last_loc_is_prev". */
7616 identify_literal_placement (bfd *abfd,
7619 struct bfd_link_info *link_info,
7620 value_map_hash_table *values,
7621 bfd_boolean *last_loc_is_prev_p,
7622 Elf_Internal_Rela *irel,
7623 int remaining_src_rels,
7625 property_table_entry *prop_table,
7627 section_cache_t *target_sec_cache,
7628 bfd_boolean is_abs_literal)
7632 xtensa_relax_info *relax_info;
7633 bfd_boolean literal_placed = FALSE;
7635 unsigned long value;
7636 bfd_boolean final_static_link;
7637 bfd_size_type sec_size;
7639 relax_info = get_xtensa_relax_info (sec);
7643 sec_size = bfd_get_section_limit (abfd, sec);
7646 (!link_info->relocatable
7647 && !elf_hash_table (link_info)->dynamic_sections_created);
7649 /* The placement algorithm first checks to see if the literal is
7650 already in the value map. If so and the value map is reachable
7651 from all uses, then the literal is moved to that location. If
7652 not, then we identify the last location where a fresh literal was
7653 placed. If the literal can be safely moved there, then we do so.
7654 If not, then we assume that the literal is not to move and leave
7655 the literal where it is, marking it as the last literal
7658 /* Find the literal value. */
7660 r_reloc_init (&r_rel, abfd, irel, contents, sec_size);
7663 BFD_ASSERT (rel->r_rel.target_offset < sec_size);
7664 value = bfd_get_32 (abfd, contents + rel->r_rel.target_offset);
7666 init_literal_value (&val, &r_rel, value, is_abs_literal);
7668 /* Check if we've seen another literal with the same value that
7669 is in the same output section. */
7670 val_map = value_map_get_cached_value (values, &val, final_static_link);
7673 && (r_reloc_get_section (&val_map->loc)->output_section
7674 == sec->output_section)
7675 && relocations_reach (rel, remaining_src_rels, &val_map->loc)
7676 && coalesce_shared_literal (sec, rel, prop_table, ptblsize, val_map))
7678 /* No change to last_loc_is_prev. */
7679 literal_placed = TRUE;
7682 /* For relocatable links, do not try to move literals. To do it
7683 correctly might increase the number of relocations in an input
7684 section making the default relocatable linking fail. */
7685 if (!link_info->relocatable && !literal_placed
7686 && values->has_last_loc && !(*last_loc_is_prev_p))
7688 asection *target_sec = r_reloc_get_section (&values->last_loc);
7689 if (target_sec && target_sec->output_section == sec->output_section)
7691 /* Increment the virtual offset. */
7692 r_reloc try_loc = values->last_loc;
7693 try_loc.virtual_offset += 4;
7695 /* There is a last loc that was in the same output section. */
7696 if (relocations_reach (rel, remaining_src_rels, &try_loc)
7697 && move_shared_literal (sec, link_info, rel,
7698 prop_table, ptblsize,
7699 &try_loc, &val, target_sec_cache))
7701 values->last_loc.virtual_offset += 4;
7702 literal_placed = TRUE;
7704 val_map = add_value_map (values, &val, &try_loc,
7707 val_map->loc = try_loc;
7712 if (!literal_placed)
7714 /* Nothing worked, leave the literal alone but update the last loc. */
7715 values->has_last_loc = TRUE;
7716 values->last_loc = rel->r_rel;
7718 val_map = add_value_map (values, &val, &rel->r_rel, final_static_link);
7720 val_map->loc = rel->r_rel;
7721 *last_loc_is_prev_p = TRUE;
7728 /* Check if the original relocations (presumably on L32R instructions)
7729 identified by reloc[0..N] can be changed to reference the literal
7730 identified by r_rel. If r_rel is out of range for any of the
7731 original relocations, then we don't want to coalesce the original
7732 literal with the one at r_rel. We only check reloc[0..N], where the
7733 offsets are all the same as for reloc[0] (i.e., they're all
7734 referencing the same literal) and where N is also bounded by the
7735 number of remaining entries in the "reloc" array. The "reloc" array
7736 is sorted by target offset so we know all the entries for the same
7737 literal will be contiguous. */
7740 relocations_reach (source_reloc *reloc,
7741 int remaining_relocs,
7742 const r_reloc *r_rel)
7744 bfd_vma from_offset, source_address, dest_address;
7748 if (!r_reloc_is_defined (r_rel))
7751 sec = r_reloc_get_section (r_rel);
7752 from_offset = reloc[0].r_rel.target_offset;
7754 for (i = 0; i < remaining_relocs; i++)
7756 if (reloc[i].r_rel.target_offset != from_offset)
7759 /* Ignore relocations that have been removed. */
7760 if (reloc[i].is_null)
7763 /* The original and new output section for these must be the same
7764 in order to coalesce. */
7765 if (r_reloc_get_section (&reloc[i].r_rel)->output_section
7766 != sec->output_section)
7769 /* Absolute literals in the same output section can always be
7771 if (reloc[i].is_abs_literal)
7774 /* A literal with no PC-relative relocations can be moved anywhere. */
7775 if (reloc[i].opnd != -1)
7777 /* Otherwise, check to see that it fits. */
7778 source_address = (reloc[i].source_sec->output_section->vma
7779 + reloc[i].source_sec->output_offset
7780 + reloc[i].r_rel.rela.r_offset);
7781 dest_address = (sec->output_section->vma
7782 + sec->output_offset
7783 + r_rel->target_offset);
7785 if (!pcrel_reloc_fits (reloc[i].opcode, reloc[i].opnd,
7786 source_address, dest_address))
7795 /* Move a literal to another literal location because it is
7796 the same as the other literal value. */
7799 coalesce_shared_literal (asection *sec,
7801 property_table_entry *prop_table,
7805 property_table_entry *entry;
7807 property_table_entry *the_add_entry;
7809 xtensa_relax_info *relax_info;
7811 relax_info = get_xtensa_relax_info (sec);
7815 entry = elf_xtensa_find_property_entry
7816 (prop_table, ptblsize, sec->vma + rel->r_rel.target_offset);
7817 if (entry && (entry->flags & XTENSA_PROP_NO_TRANSFORM))
7820 /* Mark that the literal will be coalesced. */
7821 add_removed_literal (&relax_info->removed_list, &rel->r_rel, &val_map->loc);
7823 text_action_add (&relax_info->action_list,
7824 ta_remove_literal, sec, rel->r_rel.target_offset, 4);
7826 /* If the section is 4-byte aligned, do not add fill. */
7827 if (sec->alignment_power > 2)
7829 int fill_extra_space;
7830 bfd_vma entry_sec_offset;
7833 entry_sec_offset = entry->address - sec->vma + entry->size;
7835 entry_sec_offset = rel->r_rel.target_offset + 4;
7837 /* If the literal range is at the end of the section,
7839 fill_extra_space = 0;
7840 the_add_entry = elf_xtensa_find_property_entry (prop_table, ptblsize,
7842 if (the_add_entry && (the_add_entry->flags & XTENSA_PROP_UNREACHABLE))
7843 fill_extra_space = the_add_entry->size;
7845 fa = find_fill_action (&relax_info->action_list, sec, entry_sec_offset);
7846 removed_diff = compute_removed_action_diff (fa, sec, entry_sec_offset,
7847 -4, fill_extra_space);
7849 adjust_fill_action (fa, removed_diff);
7851 text_action_add (&relax_info->action_list,
7852 ta_fill, sec, entry_sec_offset, removed_diff);
7859 /* Move a literal to another location. This may actually increase the
7860 total amount of space used because of alignments so we need to do
7861 this carefully. Also, it may make a branch go out of range. */
7864 move_shared_literal (asection *sec,
7865 struct bfd_link_info *link_info,
7867 property_table_entry *prop_table,
7869 const r_reloc *target_loc,
7870 const literal_value *lit_value,
7871 section_cache_t *target_sec_cache)
7873 property_table_entry *the_add_entry, *src_entry, *target_entry = NULL;
7874 text_action *fa, *target_fa;
7876 xtensa_relax_info *relax_info, *target_relax_info;
7877 asection *target_sec;
7879 ebb_constraint ebb_table;
7880 bfd_boolean relocs_fit;
7882 /* If this routine always returns FALSE, the literals that cannot be
7883 coalesced will not be moved. */
7884 if (elf32xtensa_no_literal_movement)
7887 relax_info = get_xtensa_relax_info (sec);
7891 target_sec = r_reloc_get_section (target_loc);
7892 target_relax_info = get_xtensa_relax_info (target_sec);
7894 /* Literals to undefined sections may not be moved because they
7895 must report an error. */
7896 if (bfd_is_und_section (target_sec))
7899 src_entry = elf_xtensa_find_property_entry
7900 (prop_table, ptblsize, sec->vma + rel->r_rel.target_offset);
7902 if (!section_cache_section (target_sec_cache, target_sec, link_info))
7905 target_entry = elf_xtensa_find_property_entry
7906 (target_sec_cache->ptbl, target_sec_cache->pte_count,
7907 target_sec->vma + target_loc->target_offset);
7912 /* Make sure that we have not broken any branches. */
7915 init_ebb_constraint (&ebb_table);
7916 ebb = &ebb_table.ebb;
7917 init_ebb (ebb, target_sec_cache->sec, target_sec_cache->contents,
7918 target_sec_cache->content_length,
7919 target_sec_cache->ptbl, target_sec_cache->pte_count,
7920 target_sec_cache->relocs, target_sec_cache->reloc_count);
7922 /* Propose to add 4 bytes + worst-case alignment size increase to
7924 ebb_propose_action (&ebb_table, EBB_NO_ALIGN, 0,
7925 ta_fill, target_loc->target_offset,
7926 -4 - (1 << target_sec->alignment_power), TRUE);
7928 /* Check all of the PC-relative relocations to make sure they still fit. */
7929 relocs_fit = check_section_ebb_pcrels_fit (target_sec->owner, target_sec,
7930 target_sec_cache->contents,
7931 target_sec_cache->relocs,
7937 text_action_add_literal (&target_relax_info->action_list,
7938 ta_add_literal, target_loc, lit_value, -4);
7940 if (target_sec->alignment_power > 2 && target_entry != src_entry)
7942 /* May need to add or remove some fill to maintain alignment. */
7943 int fill_extra_space;
7944 bfd_vma entry_sec_offset;
7947 target_entry->address - target_sec->vma + target_entry->size;
7949 /* If the literal range is at the end of the section,
7951 fill_extra_space = 0;
7953 elf_xtensa_find_property_entry (target_sec_cache->ptbl,
7954 target_sec_cache->pte_count,
7956 if (the_add_entry && (the_add_entry->flags & XTENSA_PROP_UNREACHABLE))
7957 fill_extra_space = the_add_entry->size;
7959 target_fa = find_fill_action (&target_relax_info->action_list,
7960 target_sec, entry_sec_offset);
7961 removed_diff = compute_removed_action_diff (target_fa, target_sec,
7962 entry_sec_offset, 4,
7965 adjust_fill_action (target_fa, removed_diff);
7967 text_action_add (&target_relax_info->action_list,
7968 ta_fill, target_sec, entry_sec_offset, removed_diff);
7971 /* Mark that the literal will be moved to the new location. */
7972 add_removed_literal (&relax_info->removed_list, &rel->r_rel, target_loc);
7974 /* Remove the literal. */
7975 text_action_add (&relax_info->action_list,
7976 ta_remove_literal, sec, rel->r_rel.target_offset, 4);
7978 /* If the section is 4-byte aligned, do not add fill. */
7979 if (sec->alignment_power > 2 && target_entry != src_entry)
7981 int fill_extra_space;
7982 bfd_vma entry_sec_offset;
7985 entry_sec_offset = src_entry->address - sec->vma + src_entry->size;
7987 entry_sec_offset = rel->r_rel.target_offset+4;
7989 /* If the literal range is at the end of the section,
7991 fill_extra_space = 0;
7992 the_add_entry = elf_xtensa_find_property_entry (prop_table, ptblsize,
7994 if (the_add_entry && (the_add_entry->flags & XTENSA_PROP_UNREACHABLE))
7995 fill_extra_space = the_add_entry->size;
7997 fa = find_fill_action (&relax_info->action_list, sec, entry_sec_offset);
7998 removed_diff = compute_removed_action_diff (fa, sec, entry_sec_offset,
7999 -4, fill_extra_space);
8001 adjust_fill_action (fa, removed_diff);
8003 text_action_add (&relax_info->action_list,
8004 ta_fill, sec, entry_sec_offset, removed_diff);
8011 /* Second relaxation pass. */
8013 /* Modify all of the relocations to point to the right spot, and if this
8014 is a relaxable section, delete the unwanted literals and fix the
8018 relax_section (bfd *abfd, asection *sec, struct bfd_link_info *link_info)
8020 Elf_Internal_Rela *internal_relocs;
8021 xtensa_relax_info *relax_info;
8023 bfd_boolean ok = TRUE;
8025 bfd_boolean rv = FALSE;
8026 bfd_boolean virtual_action;
8027 bfd_size_type sec_size;
8029 sec_size = bfd_get_section_limit (abfd, sec);
8030 relax_info = get_xtensa_relax_info (sec);
8031 BFD_ASSERT (relax_info);
8033 /* First translate any of the fixes that have been added already. */
8034 translate_section_fixes (sec);
8036 /* Handle property sections (e.g., literal tables) specially. */
8037 if (xtensa_is_property_section (sec))
8039 BFD_ASSERT (!relax_info->is_relaxable_literal_section);
8040 return relax_property_section (abfd, sec, link_info);
8043 internal_relocs = retrieve_internal_relocs (abfd, sec,
8044 link_info->keep_memory);
8045 contents = retrieve_contents (abfd, sec, link_info->keep_memory);
8046 if (contents == NULL && sec_size != 0)
8052 if (internal_relocs)
8054 for (i = 0; i < sec->reloc_count; i++)
8056 Elf_Internal_Rela *irel;
8057 xtensa_relax_info *target_relax_info;
8058 bfd_vma source_offset, old_source_offset;
8061 asection *target_sec;
8063 /* Locally change the source address.
8064 Translate the target to the new target address.
8065 If it points to this section and has been removed,
8069 irel = &internal_relocs[i];
8070 source_offset = irel->r_offset;
8071 old_source_offset = source_offset;
8073 r_type = ELF32_R_TYPE (irel->r_info);
8074 r_reloc_init (&r_rel, abfd, irel, contents,
8075 bfd_get_section_limit (abfd, sec));
8077 /* If this section could have changed then we may need to
8078 change the relocation's offset. */
8080 if (relax_info->is_relaxable_literal_section
8081 || relax_info->is_relaxable_asm_section)
8083 pin_internal_relocs (sec, internal_relocs);
8085 if (r_type != R_XTENSA_NONE
8086 && find_removed_literal (&relax_info->removed_list,
8089 /* Remove this relocation. */
8090 if (elf_hash_table (link_info)->dynamic_sections_created)
8091 shrink_dynamic_reloc_sections (link_info, abfd, sec, irel);
8092 irel->r_info = ELF32_R_INFO (0, R_XTENSA_NONE);
8093 irel->r_offset = offset_with_removed_text
8094 (&relax_info->action_list, irel->r_offset);
8098 if (r_type == R_XTENSA_ASM_SIMPLIFY)
8100 text_action *action =
8101 find_insn_action (&relax_info->action_list,
8103 if (action && (action->action == ta_convert_longcall
8104 || action->action == ta_remove_longcall))
8106 bfd_reloc_status_type retval;
8107 char *error_message = NULL;
8109 retval = contract_asm_expansion (contents, sec_size,
8110 irel, &error_message);
8111 if (retval != bfd_reloc_ok)
8113 (*link_info->callbacks->reloc_dangerous)
8114 (link_info, error_message, abfd, sec,
8118 /* Update the action so that the code that moves
8119 the contents will do the right thing. */
8120 if (action->action == ta_remove_longcall)
8121 action->action = ta_remove_insn;
8123 action->action = ta_none;
8124 /* Refresh the info in the r_rel. */
8125 r_reloc_init (&r_rel, abfd, irel, contents, sec_size);
8126 r_type = ELF32_R_TYPE (irel->r_info);
8130 source_offset = offset_with_removed_text
8131 (&relax_info->action_list, irel->r_offset);
8132 irel->r_offset = source_offset;
8135 /* If the target section could have changed then
8136 we may need to change the relocation's target offset. */
8138 target_sec = r_reloc_get_section (&r_rel);
8140 /* For a reference to a discarded section from a DWARF section,
8141 i.e., where action_discarded is PRETEND, the symbol will
8142 eventually be modified to refer to the kept section (at least if
8143 the kept and discarded sections are the same size). Anticipate
8144 that here and adjust things accordingly. */
8145 if (! elf_xtensa_ignore_discarded_relocs (sec)
8146 && elf_xtensa_action_discarded (sec) == PRETEND
8147 && sec->sec_info_type != ELF_INFO_TYPE_STABS
8148 && target_sec != NULL
8149 && elf_discarded_section (target_sec))
8151 /* It would be natural to call _bfd_elf_check_kept_section
8152 here, but it's not exported from elflink.c. It's also a
8153 fairly expensive check. Adjusting the relocations to the
8154 discarded section is fairly harmless; it will only adjust
8155 some addends and difference values. If it turns out that
8156 _bfd_elf_check_kept_section fails later, it won't matter,
8157 so just compare the section names to find the right group
8159 asection *kept = target_sec->kept_section;
8162 if ((kept->flags & SEC_GROUP) != 0)
8164 asection *first = elf_next_in_group (kept);
8165 asection *s = first;
8170 if (strcmp (s->name, target_sec->name) == 0)
8175 s = elf_next_in_group (s);
8182 && ((target_sec->rawsize != 0
8183 ? target_sec->rawsize : target_sec->size)
8184 == (kept->rawsize != 0 ? kept->rawsize : kept->size)))
8188 target_relax_info = get_xtensa_relax_info (target_sec);
8189 if (target_relax_info
8190 && (target_relax_info->is_relaxable_literal_section
8191 || target_relax_info->is_relaxable_asm_section))
8194 target_sec = translate_reloc (&r_rel, &new_reloc, target_sec);
8196 if (r_type == R_XTENSA_DIFF8
8197 || r_type == R_XTENSA_DIFF16
8198 || r_type == R_XTENSA_DIFF32)
8200 bfd_vma diff_value = 0, new_end_offset, diff_mask = 0;
8202 if (bfd_get_section_limit (abfd, sec) < old_source_offset)
8204 (*link_info->callbacks->reloc_dangerous)
8205 (link_info, _("invalid relocation address"),
8206 abfd, sec, old_source_offset);
8212 case R_XTENSA_DIFF8:
8214 bfd_get_8 (abfd, &contents[old_source_offset]);
8216 case R_XTENSA_DIFF16:
8218 bfd_get_16 (abfd, &contents[old_source_offset]);
8220 case R_XTENSA_DIFF32:
8222 bfd_get_32 (abfd, &contents[old_source_offset]);
8226 new_end_offset = offset_with_removed_text
8227 (&target_relax_info->action_list,
8228 r_rel.target_offset + diff_value);
8229 diff_value = new_end_offset - new_reloc.target_offset;
8233 case R_XTENSA_DIFF8:
8235 bfd_put_8 (abfd, diff_value,
8236 &contents[old_source_offset]);
8238 case R_XTENSA_DIFF16:
8240 bfd_put_16 (abfd, diff_value,
8241 &contents[old_source_offset]);
8243 case R_XTENSA_DIFF32:
8244 diff_mask = 0xffffffff;
8245 bfd_put_32 (abfd, diff_value,
8246 &contents[old_source_offset]);
8250 /* Check for overflow. */
8251 if ((diff_value & ~diff_mask) != 0)
8253 (*link_info->callbacks->reloc_dangerous)
8254 (link_info, _("overflow after relaxation"),
8255 abfd, sec, old_source_offset);
8259 pin_contents (sec, contents);
8262 /* If the relocation still references a section in the same
8263 input file, modify the relocation directly instead of
8264 adding a "fix" record. */
8265 if (target_sec->owner == abfd)
8267 unsigned r_symndx = ELF32_R_SYM (new_reloc.rela.r_info);
8268 irel->r_info = ELF32_R_INFO (r_symndx, r_type);
8269 irel->r_addend = new_reloc.rela.r_addend;
8270 pin_internal_relocs (sec, internal_relocs);
8274 bfd_vma addend_displacement;
8277 addend_displacement =
8278 new_reloc.target_offset + new_reloc.virtual_offset;
8279 fix = reloc_bfd_fix_init (sec, source_offset, r_type,
8281 addend_displacement, TRUE);
8288 if ((relax_info->is_relaxable_literal_section
8289 || relax_info->is_relaxable_asm_section)
8290 && relax_info->action_list.head)
8292 /* Walk through the planned actions and build up a table
8293 of move, copy and fill records. Use the move, copy and
8294 fill records to perform the actions once. */
8297 bfd_size_type final_size, copy_size, orig_insn_size;
8298 bfd_byte *scratch = NULL;
8299 bfd_byte *dup_contents = NULL;
8300 bfd_size_type orig_size = sec->size;
8301 bfd_vma orig_dot = 0;
8302 bfd_vma orig_dot_copied = 0; /* Byte copied already from
8303 orig dot in physical memory. */
8304 bfd_vma orig_dot_vo = 0; /* Virtual offset from orig_dot. */
8305 bfd_vma dup_dot = 0;
8307 text_action *action = relax_info->action_list.head;
8309 final_size = sec->size;
8310 for (action = relax_info->action_list.head; action;
8311 action = action->next)
8313 final_size -= action->removed_bytes;
8316 scratch = (bfd_byte *) bfd_zmalloc (final_size);
8317 dup_contents = (bfd_byte *) bfd_zmalloc (final_size);
8319 /* The dot is the current fill location. */
8321 print_action_list (stderr, &relax_info->action_list);
8324 for (action = relax_info->action_list.head; action;
8325 action = action->next)
8327 virtual_action = FALSE;
8328 if (action->offset > orig_dot)
8330 orig_dot += orig_dot_copied;
8331 orig_dot_copied = 0;
8333 /* Out of the virtual world. */
8336 if (action->offset > orig_dot)
8338 copy_size = action->offset - orig_dot;
8339 memmove (&dup_contents[dup_dot], &contents[orig_dot], copy_size);
8340 orig_dot += copy_size;
8341 dup_dot += copy_size;
8342 BFD_ASSERT (action->offset == orig_dot);
8344 else if (action->offset < orig_dot)
8346 if (action->action == ta_fill
8347 && action->offset - action->removed_bytes == orig_dot)
8349 /* This is OK because the fill only effects the dup_dot. */
8351 else if (action->action == ta_add_literal)
8353 /* TBD. Might need to handle this. */
8356 if (action->offset == orig_dot)
8358 if (action->virtual_offset > orig_dot_vo)
8360 if (orig_dot_vo == 0)
8362 /* Need to copy virtual_offset bytes. Probably four. */
8363 copy_size = action->virtual_offset - orig_dot_vo;
8364 memmove (&dup_contents[dup_dot],
8365 &contents[orig_dot], copy_size);
8366 orig_dot_copied = copy_size;
8367 dup_dot += copy_size;
8369 virtual_action = TRUE;
8372 BFD_ASSERT (action->virtual_offset <= orig_dot_vo);
8374 switch (action->action)
8376 case ta_remove_literal:
8377 case ta_remove_insn:
8378 BFD_ASSERT (action->removed_bytes >= 0);
8379 orig_dot += action->removed_bytes;
8382 case ta_narrow_insn:
8385 memmove (scratch, &contents[orig_dot], orig_insn_size);
8386 BFD_ASSERT (action->removed_bytes == 1);
8387 rv = narrow_instruction (scratch, final_size, 0);
8389 memmove (&dup_contents[dup_dot], scratch, copy_size);
8390 orig_dot += orig_insn_size;
8391 dup_dot += copy_size;
8395 if (action->removed_bytes >= 0)
8396 orig_dot += action->removed_bytes;
8399 /* Already zeroed in dup_contents. Just bump the
8401 dup_dot += (-action->removed_bytes);
8406 BFD_ASSERT (action->removed_bytes == 0);
8409 case ta_convert_longcall:
8410 case ta_remove_longcall:
8411 /* These will be removed or converted before we get here. */
8418 memmove (scratch, &contents[orig_dot], orig_insn_size);
8419 BFD_ASSERT (action->removed_bytes == -1);
8420 rv = widen_instruction (scratch, final_size, 0);
8422 memmove (&dup_contents[dup_dot], scratch, copy_size);
8423 orig_dot += orig_insn_size;
8424 dup_dot += copy_size;
8427 case ta_add_literal:
8430 BFD_ASSERT (action->removed_bytes == -4);
8431 /* TBD -- place the literal value here and insert
8433 memset (&dup_contents[dup_dot], 0, 4);
8434 pin_internal_relocs (sec, internal_relocs);
8435 pin_contents (sec, contents);
8437 if (!move_literal (abfd, link_info, sec, dup_dot, dup_contents,
8438 relax_info, &internal_relocs, &action->value))
8442 orig_dot_vo += copy_size;
8444 orig_dot += orig_insn_size;
8445 dup_dot += copy_size;
8449 /* Not implemented yet. */
8454 removed += action->removed_bytes;
8455 BFD_ASSERT (dup_dot <= final_size);
8456 BFD_ASSERT (orig_dot <= orig_size);
8459 orig_dot += orig_dot_copied;
8460 orig_dot_copied = 0;
8462 if (orig_dot != orig_size)
8464 copy_size = orig_size - orig_dot;
8465 BFD_ASSERT (orig_size > orig_dot);
8466 BFD_ASSERT (dup_dot + copy_size == final_size);
8467 memmove (&dup_contents[dup_dot], &contents[orig_dot], copy_size);
8468 orig_dot += copy_size;
8469 dup_dot += copy_size;
8471 BFD_ASSERT (orig_size == orig_dot);
8472 BFD_ASSERT (final_size == dup_dot);
8474 /* Move the dup_contents back. */
8475 if (final_size > orig_size)
8477 /* Contents need to be reallocated. Swap the dup_contents into
8479 sec->contents = dup_contents;
8481 contents = dup_contents;
8482 pin_contents (sec, contents);
8486 BFD_ASSERT (final_size <= orig_size);
8487 memset (contents, 0, orig_size);
8488 memcpy (contents, dup_contents, final_size);
8489 free (dup_contents);
8492 pin_contents (sec, contents);
8494 if (sec->rawsize == 0)
8495 sec->rawsize = sec->size;
8496 sec->size = final_size;
8500 release_internal_relocs (sec, internal_relocs);
8501 release_contents (sec, contents);
8507 translate_section_fixes (asection *sec)
8509 xtensa_relax_info *relax_info;
8512 relax_info = get_xtensa_relax_info (sec);
8516 for (r = relax_info->fix_list; r != NULL; r = r->next)
8517 if (!translate_reloc_bfd_fix (r))
8524 /* Translate a fix given the mapping in the relax info for the target
8525 section. If it has already been translated, no work is required. */
8528 translate_reloc_bfd_fix (reloc_bfd_fix *fix)
8530 reloc_bfd_fix new_fix;
8532 xtensa_relax_info *relax_info;
8533 removed_literal *removed;
8534 bfd_vma new_offset, target_offset;
8536 if (fix->translated)
8539 sec = fix->target_sec;
8540 target_offset = fix->target_offset;
8542 relax_info = get_xtensa_relax_info (sec);
8545 fix->translated = TRUE;
8551 /* The fix does not need to be translated if the section cannot change. */
8552 if (!relax_info->is_relaxable_literal_section
8553 && !relax_info->is_relaxable_asm_section)
8555 fix->translated = TRUE;
8559 /* If the literal has been moved and this relocation was on an
8560 opcode, then the relocation should move to the new literal
8561 location. Otherwise, the relocation should move within the
8565 if (is_operand_relocation (fix->src_type))
8567 /* Check if the original relocation is against a literal being
8569 removed = find_removed_literal (&relax_info->removed_list,
8577 /* The fact that there is still a relocation to this literal indicates
8578 that the literal is being coalesced, not simply removed. */
8579 BFD_ASSERT (removed->to.abfd != NULL);
8581 /* This was moved to some other address (possibly another section). */
8582 new_sec = r_reloc_get_section (&removed->to);
8586 relax_info = get_xtensa_relax_info (sec);
8588 (!relax_info->is_relaxable_literal_section
8589 && !relax_info->is_relaxable_asm_section))
8591 target_offset = removed->to.target_offset;
8592 new_fix.target_sec = new_sec;
8593 new_fix.target_offset = target_offset;
8594 new_fix.translated = TRUE;
8599 target_offset = removed->to.target_offset;
8600 new_fix.target_sec = new_sec;
8603 /* The target address may have been moved within its section. */
8604 new_offset = offset_with_removed_text (&relax_info->action_list,
8607 new_fix.target_offset = new_offset;
8608 new_fix.target_offset = new_offset;
8609 new_fix.translated = TRUE;
8615 /* Fix up a relocation to take account of removed literals. */
8618 translate_reloc (const r_reloc *orig_rel, r_reloc *new_rel, asection *sec)
8620 xtensa_relax_info *relax_info;
8621 removed_literal *removed;
8622 bfd_vma target_offset, base_offset;
8625 *new_rel = *orig_rel;
8627 if (!r_reloc_is_defined (orig_rel))
8630 relax_info = get_xtensa_relax_info (sec);
8631 BFD_ASSERT (relax_info && (relax_info->is_relaxable_literal_section
8632 || relax_info->is_relaxable_asm_section));
8634 target_offset = orig_rel->target_offset;
8637 if (is_operand_relocation (ELF32_R_TYPE (orig_rel->rela.r_info)))
8639 /* Check if the original relocation is against a literal being
8641 removed = find_removed_literal (&relax_info->removed_list,
8644 if (removed && removed->to.abfd)
8648 /* The fact that there is still a relocation to this literal indicates
8649 that the literal is being coalesced, not simply removed. */
8650 BFD_ASSERT (removed->to.abfd != NULL);
8652 /* This was moved to some other address
8653 (possibly in another section). */
8654 *new_rel = removed->to;
8655 new_sec = r_reloc_get_section (new_rel);
8659 relax_info = get_xtensa_relax_info (sec);
8661 || (!relax_info->is_relaxable_literal_section
8662 && !relax_info->is_relaxable_asm_section))
8665 target_offset = new_rel->target_offset;
8668 /* Find the base offset of the reloc symbol, excluding any addend from the
8669 reloc or from the section contents (for a partial_inplace reloc). Then
8670 find the adjusted values of the offsets due to relaxation. The base
8671 offset is needed to determine the change to the reloc's addend; the reloc
8672 addend should not be adjusted due to relaxations located before the base
8675 base_offset = r_reloc_get_target_offset (new_rel) - new_rel->rela.r_addend;
8676 act = relax_info->action_list.head;
8677 if (base_offset <= target_offset)
8679 int base_removed = removed_by_actions (&act, base_offset, FALSE);
8680 int addend_removed = removed_by_actions (&act, target_offset, FALSE);
8681 new_rel->target_offset = target_offset - base_removed - addend_removed;
8682 new_rel->rela.r_addend -= addend_removed;
8686 /* Handle a negative addend. The base offset comes first. */
8687 int tgt_removed = removed_by_actions (&act, target_offset, FALSE);
8688 int addend_removed = removed_by_actions (&act, base_offset, FALSE);
8689 new_rel->target_offset = target_offset - tgt_removed;
8690 new_rel->rela.r_addend += addend_removed;
8697 /* For dynamic links, there may be a dynamic relocation for each
8698 literal. The number of dynamic relocations must be computed in
8699 size_dynamic_sections, which occurs before relaxation. When a
8700 literal is removed, this function checks if there is a corresponding
8701 dynamic relocation and shrinks the size of the appropriate dynamic
8702 relocation section accordingly. At this point, the contents of the
8703 dynamic relocation sections have not yet been filled in, so there's
8704 nothing else that needs to be done. */
8707 shrink_dynamic_reloc_sections (struct bfd_link_info *info,
8709 asection *input_section,
8710 Elf_Internal_Rela *rel)
8712 struct elf_xtensa_link_hash_table *htab;
8713 Elf_Internal_Shdr *symtab_hdr;
8714 struct elf_link_hash_entry **sym_hashes;
8715 unsigned long r_symndx;
8717 struct elf_link_hash_entry *h;
8718 bfd_boolean dynamic_symbol;
8720 htab = elf_xtensa_hash_table (info);
8721 symtab_hdr = &elf_tdata (abfd)->symtab_hdr;
8722 sym_hashes = elf_sym_hashes (abfd);
8724 r_type = ELF32_R_TYPE (rel->r_info);
8725 r_symndx = ELF32_R_SYM (rel->r_info);
8727 if (r_symndx < symtab_hdr->sh_info)
8730 h = sym_hashes[r_symndx - symtab_hdr->sh_info];
8732 dynamic_symbol = elf_xtensa_dynamic_symbol_p (h, info);
8734 if ((r_type == R_XTENSA_32 || r_type == R_XTENSA_PLT)
8735 && (input_section->flags & SEC_ALLOC) != 0
8736 && (dynamic_symbol || info->shared))
8739 bfd_boolean is_plt = FALSE;
8741 if (dynamic_symbol && r_type == R_XTENSA_PLT)
8743 srel = htab->srelplt;
8747 srel = htab->srelgot;
8749 /* Reduce size of the .rela.* section by one reloc. */
8750 BFD_ASSERT (srel != NULL);
8751 BFD_ASSERT (srel->size >= sizeof (Elf32_External_Rela));
8752 srel->size -= sizeof (Elf32_External_Rela);
8756 asection *splt, *sgotplt, *srelgot;
8757 int reloc_index, chunk;
8759 /* Find the PLT reloc index of the entry being removed. This
8760 is computed from the size of ".rela.plt". It is needed to
8761 figure out which PLT chunk to resize. Usually "last index
8762 = size - 1" since the index starts at zero, but in this
8763 context, the size has just been decremented so there's no
8764 need to subtract one. */
8765 reloc_index = srel->size / sizeof (Elf32_External_Rela);
8767 chunk = reloc_index / PLT_ENTRIES_PER_CHUNK;
8768 splt = elf_xtensa_get_plt_section (info, chunk);
8769 sgotplt = elf_xtensa_get_gotplt_section (info, chunk);
8770 BFD_ASSERT (splt != NULL && sgotplt != NULL);
8772 /* Check if an entire PLT chunk has just been eliminated. */
8773 if (reloc_index % PLT_ENTRIES_PER_CHUNK == 0)
8775 /* The two magic GOT entries for that chunk can go away. */
8776 srelgot = htab->srelgot;
8777 BFD_ASSERT (srelgot != NULL);
8778 srelgot->reloc_count -= 2;
8779 srelgot->size -= 2 * sizeof (Elf32_External_Rela);
8782 /* There should be only one entry left (and it will be
8784 BFD_ASSERT (sgotplt->size == 4);
8785 BFD_ASSERT (splt->size == PLT_ENTRY_SIZE);
8788 BFD_ASSERT (sgotplt->size >= 4);
8789 BFD_ASSERT (splt->size >= PLT_ENTRY_SIZE);
8792 splt->size -= PLT_ENTRY_SIZE;
8798 /* Take an r_rel and move it to another section. This usually
8799 requires extending the interal_relocation array and pinning it. If
8800 the original r_rel is from the same BFD, we can complete this here.
8801 Otherwise, we add a fix record to let the final link fix the
8802 appropriate address. Contents and internal relocations for the
8803 section must be pinned after calling this routine. */
8806 move_literal (bfd *abfd,
8807 struct bfd_link_info *link_info,
8811 xtensa_relax_info *relax_info,
8812 Elf_Internal_Rela **internal_relocs_p,
8813 const literal_value *lit)
8815 Elf_Internal_Rela *new_relocs = NULL;
8816 size_t new_relocs_count = 0;
8817 Elf_Internal_Rela this_rela;
8818 const r_reloc *r_rel;
8820 r_rel = &lit->r_rel;
8821 BFD_ASSERT (elf_section_data (sec)->relocs == *internal_relocs_p);
8823 if (r_reloc_is_const (r_rel))
8824 bfd_put_32 (abfd, lit->value, contents + offset);
8829 asection *target_sec;
8833 r_type = ELF32_R_TYPE (r_rel->rela.r_info);
8834 target_sec = r_reloc_get_section (r_rel);
8836 /* This is the difficult case. We have to create a fix up. */
8837 this_rela.r_offset = offset;
8838 this_rela.r_info = ELF32_R_INFO (0, r_type);
8839 this_rela.r_addend =
8840 r_rel->target_offset - r_reloc_get_target_offset (r_rel);
8841 bfd_put_32 (abfd, lit->value, contents + offset);
8843 /* Currently, we cannot move relocations during a relocatable link. */
8844 BFD_ASSERT (!link_info->relocatable);
8845 fix = reloc_bfd_fix_init (sec, offset, r_type,
8846 r_reloc_get_section (r_rel),
8847 r_rel->target_offset + r_rel->virtual_offset,
8849 /* We also need to mark that relocations are needed here. */
8850 sec->flags |= SEC_RELOC;
8852 translate_reloc_bfd_fix (fix);
8853 /* This fix has not yet been translated. */
8856 /* Add the relocation. If we have already allocated our own
8857 space for the relocations and we have room for more, then use
8858 it. Otherwise, allocate new space and move the literals. */
8859 insert_at = sec->reloc_count;
8860 for (i = 0; i < sec->reloc_count; ++i)
8862 if (this_rela.r_offset < (*internal_relocs_p)[i].r_offset)
8869 if (*internal_relocs_p != relax_info->allocated_relocs
8870 || sec->reloc_count + 1 > relax_info->allocated_relocs_count)
8872 BFD_ASSERT (relax_info->allocated_relocs == NULL
8873 || sec->reloc_count == relax_info->relocs_count);
8875 if (relax_info->allocated_relocs_count == 0)
8876 new_relocs_count = (sec->reloc_count + 2) * 2;
8878 new_relocs_count = (relax_info->allocated_relocs_count + 2) * 2;
8880 new_relocs = (Elf_Internal_Rela *)
8881 bfd_zmalloc (sizeof (Elf_Internal_Rela) * (new_relocs_count));
8885 /* We could handle this more quickly by finding the split point. */
8887 memcpy (new_relocs, *internal_relocs_p,
8888 insert_at * sizeof (Elf_Internal_Rela));
8890 new_relocs[insert_at] = this_rela;
8892 if (insert_at != sec->reloc_count)
8893 memcpy (new_relocs + insert_at + 1,
8894 (*internal_relocs_p) + insert_at,
8895 (sec->reloc_count - insert_at)
8896 * sizeof (Elf_Internal_Rela));
8898 if (*internal_relocs_p != relax_info->allocated_relocs)
8900 /* The first time we re-allocate, we can only free the
8901 old relocs if they were allocated with bfd_malloc.
8902 This is not true when keep_memory is in effect. */
8903 if (!link_info->keep_memory)
8904 free (*internal_relocs_p);
8907 free (*internal_relocs_p);
8908 relax_info->allocated_relocs = new_relocs;
8909 relax_info->allocated_relocs_count = new_relocs_count;
8910 elf_section_data (sec)->relocs = new_relocs;
8912 relax_info->relocs_count = sec->reloc_count;
8913 *internal_relocs_p = new_relocs;
8917 if (insert_at != sec->reloc_count)
8920 for (idx = sec->reloc_count; idx > insert_at; idx--)
8921 (*internal_relocs_p)[idx] = (*internal_relocs_p)[idx-1];
8923 (*internal_relocs_p)[insert_at] = this_rela;
8925 if (relax_info->allocated_relocs)
8926 relax_info->relocs_count = sec->reloc_count;
8933 /* This is similar to relax_section except that when a target is moved,
8934 we shift addresses up. We also need to modify the size. This
8935 algorithm does NOT allow for relocations into the middle of the
8936 property sections. */
8939 relax_property_section (bfd *abfd,
8941 struct bfd_link_info *link_info)
8943 Elf_Internal_Rela *internal_relocs;
8946 bfd_boolean ok = TRUE;
8947 bfd_boolean is_full_prop_section;
8948 size_t last_zfill_target_offset = 0;
8949 asection *last_zfill_target_sec = NULL;
8950 bfd_size_type sec_size;
8951 bfd_size_type entry_size;
8953 sec_size = bfd_get_section_limit (abfd, sec);
8954 internal_relocs = retrieve_internal_relocs (abfd, sec,
8955 link_info->keep_memory);
8956 contents = retrieve_contents (abfd, sec, link_info->keep_memory);
8957 if (contents == NULL && sec_size != 0)
8963 is_full_prop_section = xtensa_is_proptable_section (sec);
8964 if (is_full_prop_section)
8969 if (internal_relocs)
8971 for (i = 0; i < sec->reloc_count; i++)
8973 Elf_Internal_Rela *irel;
8974 xtensa_relax_info *target_relax_info;
8976 asection *target_sec;
8978 bfd_byte *size_p, *flags_p;
8980 /* Locally change the source address.
8981 Translate the target to the new target address.
8982 If it points to this section and has been removed, MOVE IT.
8983 Also, don't forget to modify the associated SIZE at
8986 irel = &internal_relocs[i];
8987 r_type = ELF32_R_TYPE (irel->r_info);
8988 if (r_type == R_XTENSA_NONE)
8991 /* Find the literal value. */
8992 r_reloc_init (&val.r_rel, abfd, irel, contents, sec_size);
8993 size_p = &contents[irel->r_offset + 4];
8995 if (is_full_prop_section)
8996 flags_p = &contents[irel->r_offset + 8];
8997 BFD_ASSERT (irel->r_offset + entry_size <= sec_size);
8999 target_sec = r_reloc_get_section (&val.r_rel);
9000 target_relax_info = get_xtensa_relax_info (target_sec);
9002 if (target_relax_info
9003 && (target_relax_info->is_relaxable_literal_section
9004 || target_relax_info->is_relaxable_asm_section ))
9006 /* Translate the relocation's destination. */
9007 bfd_vma old_offset = val.r_rel.target_offset;
9009 long old_size, new_size;
9010 text_action *act = target_relax_info->action_list.head;
9011 new_offset = old_offset -
9012 removed_by_actions (&act, old_offset, FALSE);
9014 /* Assert that we are not out of bounds. */
9015 old_size = bfd_get_32 (abfd, size_p);
9016 new_size = old_size;
9020 /* Only the first zero-sized unreachable entry is
9021 allowed to expand. In this case the new offset
9022 should be the offset before the fill and the new
9023 size is the expansion size. For other zero-sized
9024 entries the resulting size should be zero with an
9025 offset before or after the fill address depending
9026 on whether the expanding unreachable entry
9028 if (last_zfill_target_sec == 0
9029 || last_zfill_target_sec != target_sec
9030 || last_zfill_target_offset != old_offset)
9032 bfd_vma new_end_offset = new_offset;
9034 /* Recompute the new_offset, but this time don't
9035 include any fill inserted by relaxation. */
9036 act = target_relax_info->action_list.head;
9037 new_offset = old_offset -
9038 removed_by_actions (&act, old_offset, TRUE);
9040 /* If it is not unreachable and we have not yet
9041 seen an unreachable at this address, place it
9042 before the fill address. */
9043 if (flags_p && (bfd_get_32 (abfd, flags_p)
9044 & XTENSA_PROP_UNREACHABLE) != 0)
9046 new_size = new_end_offset - new_offset;
9048 last_zfill_target_sec = target_sec;
9049 last_zfill_target_offset = old_offset;
9055 removed_by_actions (&act, old_offset + old_size, TRUE);
9057 if (new_size != old_size)
9059 bfd_put_32 (abfd, new_size, size_p);
9060 pin_contents (sec, contents);
9063 if (new_offset != old_offset)
9065 bfd_vma diff = new_offset - old_offset;
9066 irel->r_addend += diff;
9067 pin_internal_relocs (sec, internal_relocs);
9073 /* Combine adjacent property table entries. This is also done in
9074 finish_dynamic_sections() but at that point it's too late to
9075 reclaim the space in the output section, so we do this twice. */
9077 if (internal_relocs && (!link_info->relocatable
9078 || xtensa_is_littable_section (sec)))
9080 Elf_Internal_Rela *last_irel = NULL;
9081 Elf_Internal_Rela *irel, *next_rel, *rel_end;
9082 int removed_bytes = 0;
9084 flagword predef_flags;
9086 predef_flags = xtensa_get_property_predef_flags (sec);
9088 /* Walk over memory and relocations at the same time.
9089 This REQUIRES that the internal_relocs be sorted by offset. */
9090 qsort (internal_relocs, sec->reloc_count, sizeof (Elf_Internal_Rela),
9091 internal_reloc_compare);
9093 pin_internal_relocs (sec, internal_relocs);
9094 pin_contents (sec, contents);
9096 next_rel = internal_relocs;
9097 rel_end = internal_relocs + sec->reloc_count;
9099 BFD_ASSERT (sec->size % entry_size == 0);
9101 for (offset = 0; offset < sec->size; offset += entry_size)
9103 Elf_Internal_Rela *offset_rel, *extra_rel;
9104 bfd_vma bytes_to_remove, size, actual_offset;
9105 bfd_boolean remove_this_rel;
9108 /* Find the first relocation for the entry at the current offset.
9109 Adjust the offsets of any extra relocations for the previous
9114 for (irel = next_rel; irel < rel_end; irel++)
9116 if ((irel->r_offset == offset
9117 && ELF32_R_TYPE (irel->r_info) != R_XTENSA_NONE)
9118 || irel->r_offset > offset)
9123 irel->r_offset -= removed_bytes;
9127 /* Find the next relocation (if there are any left). */
9131 for (irel = offset_rel + 1; irel < rel_end; irel++)
9133 if (ELF32_R_TYPE (irel->r_info) != R_XTENSA_NONE)
9141 /* Check if there are relocations on the current entry. There
9142 should usually be a relocation on the offset field. If there
9143 are relocations on the size or flags, then we can't optimize
9144 this entry. Also, find the next relocation to examine on the
9148 if (offset_rel->r_offset >= offset + entry_size)
9150 next_rel = offset_rel;
9151 /* There are no relocations on the current entry, but we
9152 might still be able to remove it if the size is zero. */
9155 else if (offset_rel->r_offset > offset
9157 && extra_rel->r_offset < offset + entry_size))
9159 /* There is a relocation on the size or flags, so we can't
9160 do anything with this entry. Continue with the next. */
9161 next_rel = offset_rel;
9166 BFD_ASSERT (offset_rel->r_offset == offset);
9167 offset_rel->r_offset -= removed_bytes;
9168 next_rel = offset_rel + 1;
9174 remove_this_rel = FALSE;
9175 bytes_to_remove = 0;
9176 actual_offset = offset - removed_bytes;
9177 size = bfd_get_32 (abfd, &contents[actual_offset + 4]);
9179 if (is_full_prop_section)
9180 flags = bfd_get_32 (abfd, &contents[actual_offset + 8]);
9182 flags = predef_flags;
9185 && (flags & XTENSA_PROP_ALIGN) == 0
9186 && (flags & XTENSA_PROP_UNREACHABLE) == 0)
9188 /* Always remove entries with zero size and no alignment. */
9189 bytes_to_remove = entry_size;
9191 remove_this_rel = TRUE;
9194 && ELF32_R_TYPE (offset_rel->r_info) == R_XTENSA_32)
9200 bfd_get_32 (abfd, &contents[last_irel->r_offset + 4]);
9201 bfd_vma old_address =
9202 (last_irel->r_addend
9203 + bfd_get_32 (abfd, &contents[last_irel->r_offset]));
9204 bfd_vma new_address =
9205 (offset_rel->r_addend
9206 + bfd_get_32 (abfd, &contents[actual_offset]));
9207 if (is_full_prop_section)
9208 old_flags = bfd_get_32
9209 (abfd, &contents[last_irel->r_offset + 8]);
9211 old_flags = predef_flags;
9213 if ((ELF32_R_SYM (offset_rel->r_info)
9214 == ELF32_R_SYM (last_irel->r_info))
9215 && old_address + old_size == new_address
9216 && old_flags == flags
9217 && (old_flags & XTENSA_PROP_INSN_BRANCH_TARGET) == 0
9218 && (old_flags & XTENSA_PROP_INSN_LOOP_TARGET) == 0)
9220 /* Fix the old size. */
9221 bfd_put_32 (abfd, old_size + size,
9222 &contents[last_irel->r_offset + 4]);
9223 bytes_to_remove = entry_size;
9224 remove_this_rel = TRUE;
9227 last_irel = offset_rel;
9230 last_irel = offset_rel;
9233 if (remove_this_rel)
9235 offset_rel->r_info = ELF32_R_INFO (0, R_XTENSA_NONE);
9236 /* In case this is the last entry, move the relocation offset
9237 to the previous entry, if there is one. */
9238 if (offset_rel->r_offset >= bytes_to_remove)
9239 offset_rel->r_offset -= bytes_to_remove;
9241 offset_rel->r_offset = 0;
9244 if (bytes_to_remove != 0)
9246 removed_bytes += bytes_to_remove;
9247 if (offset + bytes_to_remove < sec->size)
9248 memmove (&contents[actual_offset],
9249 &contents[actual_offset + bytes_to_remove],
9250 sec->size - offset - bytes_to_remove);
9256 /* Fix up any extra relocations on the last entry. */
9257 for (irel = next_rel; irel < rel_end; irel++)
9258 irel->r_offset -= removed_bytes;
9260 /* Clear the removed bytes. */
9261 memset (&contents[sec->size - removed_bytes], 0, removed_bytes);
9263 if (sec->rawsize == 0)
9264 sec->rawsize = sec->size;
9265 sec->size -= removed_bytes;
9267 if (xtensa_is_littable_section (sec))
9269 asection *sgotloc = elf_xtensa_hash_table (link_info)->sgotloc;
9271 sgotloc->size -= removed_bytes;
9277 release_internal_relocs (sec, internal_relocs);
9278 release_contents (sec, contents);
9283 /* Third relaxation pass. */
9285 /* Change symbol values to account for removed literals. */
9288 relax_section_symbols (bfd *abfd, asection *sec)
9290 xtensa_relax_info *relax_info;
9291 unsigned int sec_shndx;
9292 Elf_Internal_Shdr *symtab_hdr;
9293 Elf_Internal_Sym *isymbuf;
9294 unsigned i, num_syms, num_locals;
9296 relax_info = get_xtensa_relax_info (sec);
9297 BFD_ASSERT (relax_info);
9299 if (!relax_info->is_relaxable_literal_section
9300 && !relax_info->is_relaxable_asm_section)
9303 sec_shndx = _bfd_elf_section_from_bfd_section (abfd, sec);
9305 symtab_hdr = &elf_tdata (abfd)->symtab_hdr;
9306 isymbuf = retrieve_local_syms (abfd);
9308 num_syms = symtab_hdr->sh_size / sizeof (Elf32_External_Sym);
9309 num_locals = symtab_hdr->sh_info;
9311 /* Adjust the local symbols defined in this section. */
9312 for (i = 0; i < num_locals; i++)
9314 Elf_Internal_Sym *isym = &isymbuf[i];
9316 if (isym->st_shndx == sec_shndx)
9318 text_action *act = relax_info->action_list.head;
9319 bfd_vma orig_addr = isym->st_value;
9321 isym->st_value -= removed_by_actions (&act, orig_addr, FALSE);
9323 if (ELF32_ST_TYPE (isym->st_info) == STT_FUNC)
9325 removed_by_actions (&act, orig_addr + isym->st_size, FALSE);
9329 /* Now adjust the global symbols defined in this section. */
9330 for (i = 0; i < (num_syms - num_locals); i++)
9332 struct elf_link_hash_entry *sym_hash;
9334 sym_hash = elf_sym_hashes (abfd)[i];
9336 if (sym_hash->root.type == bfd_link_hash_warning)
9337 sym_hash = (struct elf_link_hash_entry *) sym_hash->root.u.i.link;
9339 if ((sym_hash->root.type == bfd_link_hash_defined
9340 || sym_hash->root.type == bfd_link_hash_defweak)
9341 && sym_hash->root.u.def.section == sec)
9343 text_action *act = relax_info->action_list.head;
9344 bfd_vma orig_addr = sym_hash->root.u.def.value;
9346 sym_hash->root.u.def.value -=
9347 removed_by_actions (&act, orig_addr, FALSE);
9349 if (sym_hash->type == STT_FUNC)
9351 removed_by_actions (&act, orig_addr + sym_hash->size, FALSE);
9359 /* "Fix" handling functions, called while performing relocations. */
9362 do_fix_for_relocatable_link (Elf_Internal_Rela *rel,
9364 asection *input_section,
9368 asection *sec, *old_sec;
9370 int r_type = ELF32_R_TYPE (rel->r_info);
9373 if (r_type == R_XTENSA_NONE)
9376 fix = get_bfd_fix (input_section, rel->r_offset, r_type);
9380 r_reloc_init (&r_rel, input_bfd, rel, contents,
9381 bfd_get_section_limit (input_bfd, input_section));
9382 old_sec = r_reloc_get_section (&r_rel);
9383 old_offset = r_rel.target_offset;
9385 if (!old_sec || !r_reloc_is_defined (&r_rel))
9387 if (r_type != R_XTENSA_ASM_EXPAND)
9389 (*_bfd_error_handler)
9390 (_("%B(%A+0x%lx): unexpected fix for %s relocation"),
9391 input_bfd, input_section, rel->r_offset,
9392 elf_howto_table[r_type].name);
9395 /* Leave it be. Resolution will happen in a later stage. */
9399 sec = fix->target_sec;
9400 rel->r_addend += ((sec->output_offset + fix->target_offset)
9401 - (old_sec->output_offset + old_offset));
9408 do_fix_for_final_link (Elf_Internal_Rela *rel,
9410 asection *input_section,
9412 bfd_vma *relocationp)
9415 int r_type = ELF32_R_TYPE (rel->r_info);
9419 if (r_type == R_XTENSA_NONE)
9422 fix = get_bfd_fix (input_section, rel->r_offset, r_type);
9426 sec = fix->target_sec;
9428 fixup_diff = rel->r_addend;
9429 if (elf_howto_table[fix->src_type].partial_inplace)
9431 bfd_vma inplace_val;
9432 BFD_ASSERT (fix->src_offset
9433 < bfd_get_section_limit (input_bfd, input_section));
9434 inplace_val = bfd_get_32 (input_bfd, &contents[fix->src_offset]);
9435 fixup_diff += inplace_val;
9438 *relocationp = (sec->output_section->vma
9439 + sec->output_offset
9440 + fix->target_offset - fixup_diff);
9444 /* Miscellaneous utility functions.... */
9447 elf_xtensa_get_plt_section (struct bfd_link_info *info, int chunk)
9449 struct elf_xtensa_link_hash_table *htab;
9455 htab = elf_xtensa_hash_table (info);
9459 dynobj = elf_hash_table (info)->dynobj;
9460 sprintf (plt_name, ".plt.%u", chunk);
9461 return bfd_get_section_by_name (dynobj, plt_name);
9466 elf_xtensa_get_gotplt_section (struct bfd_link_info *info, int chunk)
9468 struct elf_xtensa_link_hash_table *htab;
9474 htab = elf_xtensa_hash_table (info);
9475 return htab->sgotplt;
9478 dynobj = elf_hash_table (info)->dynobj;
9479 sprintf (got_name, ".got.plt.%u", chunk);
9480 return bfd_get_section_by_name (dynobj, got_name);
9484 /* Get the input section for a given symbol index.
9486 . a section symbol, return the section;
9487 . a common symbol, return the common section;
9488 . an undefined symbol, return the undefined section;
9489 . an indirect symbol, follow the links;
9490 . an absolute value, return the absolute section. */
9493 get_elf_r_symndx_section (bfd *abfd, unsigned long r_symndx)
9495 Elf_Internal_Shdr *symtab_hdr = &elf_tdata (abfd)->symtab_hdr;
9496 asection *target_sec = NULL;
9497 if (r_symndx < symtab_hdr->sh_info)
9499 Elf_Internal_Sym *isymbuf;
9500 unsigned int section_index;
9502 isymbuf = retrieve_local_syms (abfd);
9503 section_index = isymbuf[r_symndx].st_shndx;
9505 if (section_index == SHN_UNDEF)
9506 target_sec = bfd_und_section_ptr;
9507 else if (section_index == SHN_ABS)
9508 target_sec = bfd_abs_section_ptr;
9509 else if (section_index == SHN_COMMON)
9510 target_sec = bfd_com_section_ptr;
9512 target_sec = bfd_section_from_elf_index (abfd, section_index);
9516 unsigned long indx = r_symndx - symtab_hdr->sh_info;
9517 struct elf_link_hash_entry *h = elf_sym_hashes (abfd)[indx];
9519 while (h->root.type == bfd_link_hash_indirect
9520 || h->root.type == bfd_link_hash_warning)
9521 h = (struct elf_link_hash_entry *) h->root.u.i.link;
9523 switch (h->root.type)
9525 case bfd_link_hash_defined:
9526 case bfd_link_hash_defweak:
9527 target_sec = h->root.u.def.section;
9529 case bfd_link_hash_common:
9530 target_sec = bfd_com_section_ptr;
9532 case bfd_link_hash_undefined:
9533 case bfd_link_hash_undefweak:
9534 target_sec = bfd_und_section_ptr;
9536 default: /* New indirect warning. */
9537 target_sec = bfd_und_section_ptr;
9545 static struct elf_link_hash_entry *
9546 get_elf_r_symndx_hash_entry (bfd *abfd, unsigned long r_symndx)
9549 struct elf_link_hash_entry *h;
9550 Elf_Internal_Shdr *symtab_hdr = &elf_tdata (abfd)->symtab_hdr;
9552 if (r_symndx < symtab_hdr->sh_info)
9555 indx = r_symndx - symtab_hdr->sh_info;
9556 h = elf_sym_hashes (abfd)[indx];
9557 while (h->root.type == bfd_link_hash_indirect
9558 || h->root.type == bfd_link_hash_warning)
9559 h = (struct elf_link_hash_entry *) h->root.u.i.link;
9564 /* Get the section-relative offset for a symbol number. */
9567 get_elf_r_symndx_offset (bfd *abfd, unsigned long r_symndx)
9569 Elf_Internal_Shdr *symtab_hdr = &elf_tdata (abfd)->symtab_hdr;
9572 if (r_symndx < symtab_hdr->sh_info)
9574 Elf_Internal_Sym *isymbuf;
9575 isymbuf = retrieve_local_syms (abfd);
9576 offset = isymbuf[r_symndx].st_value;
9580 unsigned long indx = r_symndx - symtab_hdr->sh_info;
9581 struct elf_link_hash_entry *h =
9582 elf_sym_hashes (abfd)[indx];
9584 while (h->root.type == bfd_link_hash_indirect
9585 || h->root.type == bfd_link_hash_warning)
9586 h = (struct elf_link_hash_entry *) h->root.u.i.link;
9587 if (h->root.type == bfd_link_hash_defined
9588 || h->root.type == bfd_link_hash_defweak)
9589 offset = h->root.u.def.value;
9596 is_reloc_sym_weak (bfd *abfd, Elf_Internal_Rela *rel)
9598 unsigned long r_symndx = ELF32_R_SYM (rel->r_info);
9599 struct elf_link_hash_entry *h;
9601 h = get_elf_r_symndx_hash_entry (abfd, r_symndx);
9602 if (h && h->root.type == bfd_link_hash_defweak)
9609 pcrel_reloc_fits (xtensa_opcode opc,
9611 bfd_vma self_address,
9612 bfd_vma dest_address)
9614 xtensa_isa isa = xtensa_default_isa;
9615 uint32 valp = dest_address;
9616 if (xtensa_operand_do_reloc (isa, opc, opnd, &valp, self_address)
9617 || xtensa_operand_encode (isa, opc, opnd, &valp))
9624 xtensa_is_property_section (asection *sec)
9626 if (xtensa_is_insntable_section (sec)
9627 || xtensa_is_littable_section (sec)
9628 || xtensa_is_proptable_section (sec))
9636 xtensa_is_insntable_section (asection *sec)
9638 if (CONST_STRNEQ (sec->name, XTENSA_INSN_SEC_NAME)
9639 || CONST_STRNEQ (sec->name, ".gnu.linkonce.x."))
9647 xtensa_is_littable_section (asection *sec)
9649 if (CONST_STRNEQ (sec->name, XTENSA_LIT_SEC_NAME)
9650 || CONST_STRNEQ (sec->name, ".gnu.linkonce.p."))
9658 xtensa_is_proptable_section (asection *sec)
9660 if (CONST_STRNEQ (sec->name, XTENSA_PROP_SEC_NAME)
9661 || CONST_STRNEQ (sec->name, ".gnu.linkonce.prop."))
9669 internal_reloc_compare (const void *ap, const void *bp)
9671 const Elf_Internal_Rela *a = (const Elf_Internal_Rela *) ap;
9672 const Elf_Internal_Rela *b = (const Elf_Internal_Rela *) bp;
9674 if (a->r_offset != b->r_offset)
9675 return (a->r_offset - b->r_offset);
9677 /* We don't need to sort on these criteria for correctness,
9678 but enforcing a more strict ordering prevents unstable qsort
9679 from behaving differently with different implementations.
9680 Without the code below we get correct but different results
9681 on Solaris 2.7 and 2.8. We would like to always produce the
9682 same results no matter the host. */
9684 if (a->r_info != b->r_info)
9685 return (a->r_info - b->r_info);
9687 return (a->r_addend - b->r_addend);
9692 internal_reloc_matches (const void *ap, const void *bp)
9694 const Elf_Internal_Rela *a = (const Elf_Internal_Rela *) ap;
9695 const Elf_Internal_Rela *b = (const Elf_Internal_Rela *) bp;
9697 /* Check if one entry overlaps with the other; this shouldn't happen
9698 except when searching for a match. */
9699 return (a->r_offset - b->r_offset);
9703 /* Predicate function used to look up a section in a particular group. */
9706 match_section_group (bfd *abfd ATTRIBUTE_UNUSED, asection *sec, void *inf)
9708 const char *gname = inf;
9709 const char *group_name = elf_group_name (sec);
9711 return (group_name == gname
9712 || (group_name != NULL
9714 && strcmp (group_name, gname) == 0));
9718 static int linkonce_len = sizeof (".gnu.linkonce.") - 1;
9721 xtensa_property_section_name (asection *sec, const char *base_name)
9723 const char *suffix, *group_name;
9724 char *prop_sec_name;
9726 group_name = elf_group_name (sec);
9729 suffix = strrchr (sec->name, '.');
9730 if (suffix == sec->name)
9732 prop_sec_name = (char *) bfd_malloc (strlen (base_name) + 1
9733 + (suffix ? strlen (suffix) : 0));
9734 strcpy (prop_sec_name, base_name);
9736 strcat (prop_sec_name, suffix);
9738 else if (strncmp (sec->name, ".gnu.linkonce.", linkonce_len) == 0)
9740 char *linkonce_kind = 0;
9742 if (strcmp (base_name, XTENSA_INSN_SEC_NAME) == 0)
9743 linkonce_kind = "x.";
9744 else if (strcmp (base_name, XTENSA_LIT_SEC_NAME) == 0)
9745 linkonce_kind = "p.";
9746 else if (strcmp (base_name, XTENSA_PROP_SEC_NAME) == 0)
9747 linkonce_kind = "prop.";
9751 prop_sec_name = (char *) bfd_malloc (strlen (sec->name)
9752 + strlen (linkonce_kind) + 1);
9753 memcpy (prop_sec_name, ".gnu.linkonce.", linkonce_len);
9754 strcpy (prop_sec_name + linkonce_len, linkonce_kind);
9756 suffix = sec->name + linkonce_len;
9757 /* For backward compatibility, replace "t." instead of inserting
9758 the new linkonce_kind (but not for "prop" sections). */
9759 if (CONST_STRNEQ (suffix, "t.") && linkonce_kind[1] == '.')
9761 strcat (prop_sec_name + linkonce_len, suffix);
9764 prop_sec_name = strdup (base_name);
9766 return prop_sec_name;
9771 xtensa_get_property_section (asection *sec, const char *base_name)
9773 char *prop_sec_name;
9776 prop_sec_name = xtensa_property_section_name (sec, base_name);
9777 prop_sec = bfd_get_section_by_name_if (sec->owner, prop_sec_name,
9778 match_section_group,
9779 (void *) elf_group_name (sec));
9780 free (prop_sec_name);
9786 xtensa_make_property_section (asection *sec, const char *base_name)
9788 char *prop_sec_name;
9791 /* Check if the section already exists. */
9792 prop_sec_name = xtensa_property_section_name (sec, base_name);
9793 prop_sec = bfd_get_section_by_name_if (sec->owner, prop_sec_name,
9794 match_section_group,
9795 (void *) elf_group_name (sec));
9796 /* If not, create it. */
9799 flagword flags = (SEC_RELOC | SEC_HAS_CONTENTS | SEC_READONLY);
9800 flags |= (bfd_get_section_flags (sec->owner, sec)
9801 & (SEC_LINK_ONCE | SEC_LINK_DUPLICATES));
9803 prop_sec = bfd_make_section_anyway_with_flags
9804 (sec->owner, strdup (prop_sec_name), flags);
9808 elf_group_name (prop_sec) = elf_group_name (sec);
9811 free (prop_sec_name);
9817 xtensa_get_property_predef_flags (asection *sec)
9819 if (xtensa_is_insntable_section (sec))
9820 return (XTENSA_PROP_INSN
9821 | XTENSA_PROP_NO_TRANSFORM
9822 | XTENSA_PROP_INSN_NO_REORDER);
9824 if (xtensa_is_littable_section (sec))
9825 return (XTENSA_PROP_LITERAL
9826 | XTENSA_PROP_NO_TRANSFORM
9827 | XTENSA_PROP_INSN_NO_REORDER);
9833 /* Other functions called directly by the linker. */
9836 xtensa_callback_required_dependence (bfd *abfd,
9838 struct bfd_link_info *link_info,
9839 deps_callback_t callback,
9842 Elf_Internal_Rela *internal_relocs;
9845 bfd_boolean ok = TRUE;
9846 bfd_size_type sec_size;
9848 sec_size = bfd_get_section_limit (abfd, sec);
9850 /* ".plt*" sections have no explicit relocations but they contain L32R
9851 instructions that reference the corresponding ".got.plt*" sections. */
9852 if ((sec->flags & SEC_LINKER_CREATED) != 0
9853 && CONST_STRNEQ (sec->name, ".plt"))
9857 /* Find the corresponding ".got.plt*" section. */
9858 if (sec->name[4] == '\0')
9859 sgotplt = bfd_get_section_by_name (sec->owner, ".got.plt");
9865 BFD_ASSERT (sec->name[4] == '.');
9866 chunk = strtol (&sec->name[5], NULL, 10);
9868 sprintf (got_name, ".got.plt.%u", chunk);
9869 sgotplt = bfd_get_section_by_name (sec->owner, got_name);
9871 BFD_ASSERT (sgotplt);
9873 /* Assume worst-case offsets: L32R at the very end of the ".plt"
9874 section referencing a literal at the very beginning of
9875 ".got.plt". This is very close to the real dependence, anyway. */
9876 (*callback) (sec, sec_size, sgotplt, 0, closure);
9879 /* Only ELF files are supported for Xtensa. Check here to avoid a segfault
9880 when building uclibc, which runs "ld -b binary /dev/null". */
9881 if (bfd_get_flavour (abfd) != bfd_target_elf_flavour)
9884 internal_relocs = retrieve_internal_relocs (abfd, sec,
9885 link_info->keep_memory);
9886 if (internal_relocs == NULL
9887 || sec->reloc_count == 0)
9890 /* Cache the contents for the duration of this scan. */
9891 contents = retrieve_contents (abfd, sec, link_info->keep_memory);
9892 if (contents == NULL && sec_size != 0)
9898 if (!xtensa_default_isa)
9899 xtensa_default_isa = xtensa_isa_init (0, 0);
9901 for (i = 0; i < sec->reloc_count; i++)
9903 Elf_Internal_Rela *irel = &internal_relocs[i];
9904 if (is_l32r_relocation (abfd, sec, contents, irel))
9907 asection *target_sec;
9908 bfd_vma target_offset;
9910 r_reloc_init (&l32r_rel, abfd, irel, contents, sec_size);
9913 /* L32Rs must be local to the input file. */
9914 if (r_reloc_is_defined (&l32r_rel))
9916 target_sec = r_reloc_get_section (&l32r_rel);
9917 target_offset = l32r_rel.target_offset;
9919 (*callback) (sec, irel->r_offset, target_sec, target_offset,
9925 release_internal_relocs (sec, internal_relocs);
9926 release_contents (sec, contents);
9930 /* The default literal sections should always be marked as "code" (i.e.,
9931 SHF_EXECINSTR). This is particularly important for the Linux kernel
9932 module loader so that the literals are not placed after the text. */
9933 static const struct bfd_elf_special_section elf_xtensa_special_sections[] =
9935 { STRING_COMMA_LEN (".fini.literal"), 0, SHT_PROGBITS, SHF_ALLOC + SHF_EXECINSTR },
9936 { STRING_COMMA_LEN (".init.literal"), 0, SHT_PROGBITS, SHF_ALLOC + SHF_EXECINSTR },
9937 { STRING_COMMA_LEN (".literal"), 0, SHT_PROGBITS, SHF_ALLOC + SHF_EXECINSTR },
9938 { STRING_COMMA_LEN (".xtensa.info"), 0, SHT_NOTE, 0 },
9939 { NULL, 0, 0, 0, 0 }
9943 #define TARGET_LITTLE_SYM bfd_elf32_xtensa_le_vec
9944 #define TARGET_LITTLE_NAME "elf32-xtensa-le"
9945 #define TARGET_BIG_SYM bfd_elf32_xtensa_be_vec
9946 #define TARGET_BIG_NAME "elf32-xtensa-be"
9947 #define ELF_ARCH bfd_arch_xtensa
9949 #define ELF_MACHINE_CODE EM_XTENSA
9950 #define ELF_MACHINE_ALT1 EM_XTENSA_OLD
9953 #define ELF_MAXPAGESIZE (1 << XCHAL_MMU_MIN_PTE_PAGE_SIZE)
9954 #else /* !XCHAL_HAVE_MMU */
9955 #define ELF_MAXPAGESIZE 1
9956 #endif /* !XCHAL_HAVE_MMU */
9957 #endif /* ELF_ARCH */
9959 #define elf_backend_can_gc_sections 1
9960 #define elf_backend_can_refcount 1
9961 #define elf_backend_plt_readonly 1
9962 #define elf_backend_got_header_size 4
9963 #define elf_backend_want_dynbss 0
9964 #define elf_backend_want_got_plt 1
9966 #define elf_info_to_howto elf_xtensa_info_to_howto_rela
9968 #define bfd_elf32_bfd_merge_private_bfd_data elf_xtensa_merge_private_bfd_data
9969 #define bfd_elf32_new_section_hook elf_xtensa_new_section_hook
9970 #define bfd_elf32_bfd_print_private_bfd_data elf_xtensa_print_private_bfd_data
9971 #define bfd_elf32_bfd_relax_section elf_xtensa_relax_section
9972 #define bfd_elf32_bfd_reloc_type_lookup elf_xtensa_reloc_type_lookup
9973 #define bfd_elf32_bfd_reloc_name_lookup \
9974 elf_xtensa_reloc_name_lookup
9975 #define bfd_elf32_bfd_set_private_flags elf_xtensa_set_private_flags
9976 #define bfd_elf32_bfd_link_hash_table_create elf_xtensa_link_hash_table_create
9978 #define elf_backend_adjust_dynamic_symbol elf_xtensa_adjust_dynamic_symbol
9979 #define elf_backend_check_relocs elf_xtensa_check_relocs
9980 #define elf_backend_create_dynamic_sections elf_xtensa_create_dynamic_sections
9981 #define elf_backend_discard_info elf_xtensa_discard_info
9982 #define elf_backend_ignore_discarded_relocs elf_xtensa_ignore_discarded_relocs
9983 #define elf_backend_final_write_processing elf_xtensa_final_write_processing
9984 #define elf_backend_finish_dynamic_sections elf_xtensa_finish_dynamic_sections
9985 #define elf_backend_finish_dynamic_symbol elf_xtensa_finish_dynamic_symbol
9986 #define elf_backend_gc_mark_hook elf_xtensa_gc_mark_hook
9987 #define elf_backend_gc_sweep_hook elf_xtensa_gc_sweep_hook
9988 #define elf_backend_grok_prstatus elf_xtensa_grok_prstatus
9989 #define elf_backend_grok_psinfo elf_xtensa_grok_psinfo
9990 #define elf_backend_hide_symbol elf_xtensa_hide_symbol
9991 #define elf_backend_object_p elf_xtensa_object_p
9992 #define elf_backend_reloc_type_class elf_xtensa_reloc_type_class
9993 #define elf_backend_relocate_section elf_xtensa_relocate_section
9994 #define elf_backend_size_dynamic_sections elf_xtensa_size_dynamic_sections
9995 #define elf_backend_omit_section_dynsym \
9996 ((bfd_boolean (*) (bfd *, struct bfd_link_info *, asection *)) bfd_true)
9997 #define elf_backend_special_sections elf_xtensa_special_sections
9998 #define elf_backend_action_discarded elf_xtensa_action_discarded
10000 #include "elf32-target.h"