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 extern asection *xtensa_get_property_section (asection *, const char *);
112 static flagword xtensa_get_property_predef_flags (asection *);
114 /* Other functions called directly by the linker. */
116 typedef void (*deps_callback_t)
117 (asection *, bfd_vma, asection *, bfd_vma, void *);
118 extern bfd_boolean xtensa_callback_required_dependence
119 (bfd *, asection *, struct bfd_link_info *, deps_callback_t, void *);
122 /* Globally visible flag for choosing size optimization of NOP removal
123 instead of branch-target-aware minimization for NOP removal.
124 When nonzero, narrow all instructions and remove all NOPs possible
125 around longcall expansions. */
127 int elf32xtensa_size_opt;
130 /* The "new_section_hook" is used to set up a per-section
131 "xtensa_relax_info" data structure with additional information used
132 during relaxation. */
134 typedef struct xtensa_relax_info_struct xtensa_relax_info;
137 /* The GNU tools do not easily allow extending interfaces to pass around
138 the pointer to the Xtensa ISA information, so instead we add a global
139 variable here (in BFD) that can be used by any of the tools that need
142 xtensa_isa xtensa_default_isa;
145 /* When this is true, relocations may have been modified to refer to
146 symbols from other input files. The per-section list of "fix"
147 records needs to be checked when resolving relocations. */
149 static bfd_boolean relaxing_section = FALSE;
151 /* When this is true, during final links, literals that cannot be
152 coalesced and their relocations may be moved to other sections. */
154 int elf32xtensa_no_literal_movement = 1;
157 static reloc_howto_type elf_howto_table[] =
159 HOWTO (R_XTENSA_NONE, 0, 0, 0, FALSE, 0, complain_overflow_dont,
160 bfd_elf_xtensa_reloc, "R_XTENSA_NONE",
162 HOWTO (R_XTENSA_32, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
163 bfd_elf_xtensa_reloc, "R_XTENSA_32",
164 TRUE, 0xffffffff, 0xffffffff, FALSE),
166 /* Replace a 32-bit value with a value from the runtime linker (only
167 used by linker-generated stub functions). The r_addend value is
168 special: 1 means to substitute a pointer to the runtime linker's
169 dynamic resolver function; 2 means to substitute the link map for
170 the shared object. */
171 HOWTO (R_XTENSA_RTLD, 0, 2, 32, FALSE, 0, complain_overflow_dont,
172 NULL, "R_XTENSA_RTLD", FALSE, 0, 0, FALSE),
174 HOWTO (R_XTENSA_GLOB_DAT, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
175 bfd_elf_generic_reloc, "R_XTENSA_GLOB_DAT",
176 FALSE, 0, 0xffffffff, FALSE),
177 HOWTO (R_XTENSA_JMP_SLOT, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
178 bfd_elf_generic_reloc, "R_XTENSA_JMP_SLOT",
179 FALSE, 0, 0xffffffff, FALSE),
180 HOWTO (R_XTENSA_RELATIVE, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
181 bfd_elf_generic_reloc, "R_XTENSA_RELATIVE",
182 FALSE, 0, 0xffffffff, FALSE),
183 HOWTO (R_XTENSA_PLT, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
184 bfd_elf_xtensa_reloc, "R_XTENSA_PLT",
185 FALSE, 0, 0xffffffff, FALSE),
189 /* Old relocations for backward compatibility. */
190 HOWTO (R_XTENSA_OP0, 0, 0, 0, TRUE, 0, complain_overflow_dont,
191 bfd_elf_xtensa_reloc, "R_XTENSA_OP0", FALSE, 0, 0, TRUE),
192 HOWTO (R_XTENSA_OP1, 0, 0, 0, TRUE, 0, complain_overflow_dont,
193 bfd_elf_xtensa_reloc, "R_XTENSA_OP1", FALSE, 0, 0, TRUE),
194 HOWTO (R_XTENSA_OP2, 0, 0, 0, TRUE, 0, complain_overflow_dont,
195 bfd_elf_xtensa_reloc, "R_XTENSA_OP2", FALSE, 0, 0, TRUE),
197 /* Assembly auto-expansion. */
198 HOWTO (R_XTENSA_ASM_EXPAND, 0, 0, 0, TRUE, 0, complain_overflow_dont,
199 bfd_elf_xtensa_reloc, "R_XTENSA_ASM_EXPAND", FALSE, 0, 0, TRUE),
200 /* Relax assembly auto-expansion. */
201 HOWTO (R_XTENSA_ASM_SIMPLIFY, 0, 0, 0, TRUE, 0, complain_overflow_dont,
202 bfd_elf_xtensa_reloc, "R_XTENSA_ASM_SIMPLIFY", FALSE, 0, 0, TRUE),
206 HOWTO (R_XTENSA_32_PCREL, 0, 2, 32, TRUE, 0, complain_overflow_bitfield,
207 bfd_elf_xtensa_reloc, "R_XTENSA_32_PCREL",
208 FALSE, 0, 0xffffffff, TRUE),
210 /* GNU extension to record C++ vtable hierarchy. */
211 HOWTO (R_XTENSA_GNU_VTINHERIT, 0, 2, 0, FALSE, 0, complain_overflow_dont,
212 NULL, "R_XTENSA_GNU_VTINHERIT",
214 /* GNU extension to record C++ vtable member usage. */
215 HOWTO (R_XTENSA_GNU_VTENTRY, 0, 2, 0, FALSE, 0, complain_overflow_dont,
216 _bfd_elf_rel_vtable_reloc_fn, "R_XTENSA_GNU_VTENTRY",
219 /* Relocations for supporting difference of symbols. */
220 HOWTO (R_XTENSA_DIFF8, 0, 0, 8, FALSE, 0, complain_overflow_bitfield,
221 bfd_elf_xtensa_reloc, "R_XTENSA_DIFF8", FALSE, 0, 0xff, FALSE),
222 HOWTO (R_XTENSA_DIFF16, 0, 1, 16, FALSE, 0, complain_overflow_bitfield,
223 bfd_elf_xtensa_reloc, "R_XTENSA_DIFF16", FALSE, 0, 0xffff, FALSE),
224 HOWTO (R_XTENSA_DIFF32, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
225 bfd_elf_xtensa_reloc, "R_XTENSA_DIFF32", FALSE, 0, 0xffffffff, FALSE),
227 /* General immediate operand relocations. */
228 HOWTO (R_XTENSA_SLOT0_OP, 0, 0, 0, TRUE, 0, complain_overflow_dont,
229 bfd_elf_xtensa_reloc, "R_XTENSA_SLOT0_OP", FALSE, 0, 0, TRUE),
230 HOWTO (R_XTENSA_SLOT1_OP, 0, 0, 0, TRUE, 0, complain_overflow_dont,
231 bfd_elf_xtensa_reloc, "R_XTENSA_SLOT1_OP", FALSE, 0, 0, TRUE),
232 HOWTO (R_XTENSA_SLOT2_OP, 0, 0, 0, TRUE, 0, complain_overflow_dont,
233 bfd_elf_xtensa_reloc, "R_XTENSA_SLOT2_OP", FALSE, 0, 0, TRUE),
234 HOWTO (R_XTENSA_SLOT3_OP, 0, 0, 0, TRUE, 0, complain_overflow_dont,
235 bfd_elf_xtensa_reloc, "R_XTENSA_SLOT3_OP", FALSE, 0, 0, TRUE),
236 HOWTO (R_XTENSA_SLOT4_OP, 0, 0, 0, TRUE, 0, complain_overflow_dont,
237 bfd_elf_xtensa_reloc, "R_XTENSA_SLOT4_OP", FALSE, 0, 0, TRUE),
238 HOWTO (R_XTENSA_SLOT5_OP, 0, 0, 0, TRUE, 0, complain_overflow_dont,
239 bfd_elf_xtensa_reloc, "R_XTENSA_SLOT5_OP", FALSE, 0, 0, TRUE),
240 HOWTO (R_XTENSA_SLOT6_OP, 0, 0, 0, TRUE, 0, complain_overflow_dont,
241 bfd_elf_xtensa_reloc, "R_XTENSA_SLOT6_OP", FALSE, 0, 0, TRUE),
242 HOWTO (R_XTENSA_SLOT7_OP, 0, 0, 0, TRUE, 0, complain_overflow_dont,
243 bfd_elf_xtensa_reloc, "R_XTENSA_SLOT7_OP", FALSE, 0, 0, TRUE),
244 HOWTO (R_XTENSA_SLOT8_OP, 0, 0, 0, TRUE, 0, complain_overflow_dont,
245 bfd_elf_xtensa_reloc, "R_XTENSA_SLOT8_OP", FALSE, 0, 0, TRUE),
246 HOWTO (R_XTENSA_SLOT9_OP, 0, 0, 0, TRUE, 0, complain_overflow_dont,
247 bfd_elf_xtensa_reloc, "R_XTENSA_SLOT9_OP", FALSE, 0, 0, TRUE),
248 HOWTO (R_XTENSA_SLOT10_OP, 0, 0, 0, TRUE, 0, complain_overflow_dont,
249 bfd_elf_xtensa_reloc, "R_XTENSA_SLOT10_OP", FALSE, 0, 0, TRUE),
250 HOWTO (R_XTENSA_SLOT11_OP, 0, 0, 0, TRUE, 0, complain_overflow_dont,
251 bfd_elf_xtensa_reloc, "R_XTENSA_SLOT11_OP", FALSE, 0, 0, TRUE),
252 HOWTO (R_XTENSA_SLOT12_OP, 0, 0, 0, TRUE, 0, complain_overflow_dont,
253 bfd_elf_xtensa_reloc, "R_XTENSA_SLOT12_OP", FALSE, 0, 0, TRUE),
254 HOWTO (R_XTENSA_SLOT13_OP, 0, 0, 0, TRUE, 0, complain_overflow_dont,
255 bfd_elf_xtensa_reloc, "R_XTENSA_SLOT13_OP", FALSE, 0, 0, TRUE),
256 HOWTO (R_XTENSA_SLOT14_OP, 0, 0, 0, TRUE, 0, complain_overflow_dont,
257 bfd_elf_xtensa_reloc, "R_XTENSA_SLOT14_OP", FALSE, 0, 0, TRUE),
259 /* "Alternate" relocations. The meaning of these is opcode-specific. */
260 HOWTO (R_XTENSA_SLOT0_ALT, 0, 0, 0, TRUE, 0, complain_overflow_dont,
261 bfd_elf_xtensa_reloc, "R_XTENSA_SLOT0_ALT", FALSE, 0, 0, TRUE),
262 HOWTO (R_XTENSA_SLOT1_ALT, 0, 0, 0, TRUE, 0, complain_overflow_dont,
263 bfd_elf_xtensa_reloc, "R_XTENSA_SLOT1_ALT", FALSE, 0, 0, TRUE),
264 HOWTO (R_XTENSA_SLOT2_ALT, 0, 0, 0, TRUE, 0, complain_overflow_dont,
265 bfd_elf_xtensa_reloc, "R_XTENSA_SLOT2_ALT", FALSE, 0, 0, TRUE),
266 HOWTO (R_XTENSA_SLOT3_ALT, 0, 0, 0, TRUE, 0, complain_overflow_dont,
267 bfd_elf_xtensa_reloc, "R_XTENSA_SLOT3_ALT", FALSE, 0, 0, TRUE),
268 HOWTO (R_XTENSA_SLOT4_ALT, 0, 0, 0, TRUE, 0, complain_overflow_dont,
269 bfd_elf_xtensa_reloc, "R_XTENSA_SLOT4_ALT", FALSE, 0, 0, TRUE),
270 HOWTO (R_XTENSA_SLOT5_ALT, 0, 0, 0, TRUE, 0, complain_overflow_dont,
271 bfd_elf_xtensa_reloc, "R_XTENSA_SLOT5_ALT", FALSE, 0, 0, TRUE),
272 HOWTO (R_XTENSA_SLOT6_ALT, 0, 0, 0, TRUE, 0, complain_overflow_dont,
273 bfd_elf_xtensa_reloc, "R_XTENSA_SLOT6_ALT", FALSE, 0, 0, TRUE),
274 HOWTO (R_XTENSA_SLOT7_ALT, 0, 0, 0, TRUE, 0, complain_overflow_dont,
275 bfd_elf_xtensa_reloc, "R_XTENSA_SLOT7_ALT", FALSE, 0, 0, TRUE),
276 HOWTO (R_XTENSA_SLOT8_ALT, 0, 0, 0, TRUE, 0, complain_overflow_dont,
277 bfd_elf_xtensa_reloc, "R_XTENSA_SLOT8_ALT", FALSE, 0, 0, TRUE),
278 HOWTO (R_XTENSA_SLOT9_ALT, 0, 0, 0, TRUE, 0, complain_overflow_dont,
279 bfd_elf_xtensa_reloc, "R_XTENSA_SLOT9_ALT", FALSE, 0, 0, TRUE),
280 HOWTO (R_XTENSA_SLOT10_ALT, 0, 0, 0, TRUE, 0, complain_overflow_dont,
281 bfd_elf_xtensa_reloc, "R_XTENSA_SLOT10_ALT", FALSE, 0, 0, TRUE),
282 HOWTO (R_XTENSA_SLOT11_ALT, 0, 0, 0, TRUE, 0, complain_overflow_dont,
283 bfd_elf_xtensa_reloc, "R_XTENSA_SLOT11_ALT", FALSE, 0, 0, TRUE),
284 HOWTO (R_XTENSA_SLOT12_ALT, 0, 0, 0, TRUE, 0, complain_overflow_dont,
285 bfd_elf_xtensa_reloc, "R_XTENSA_SLOT12_ALT", FALSE, 0, 0, TRUE),
286 HOWTO (R_XTENSA_SLOT13_ALT, 0, 0, 0, TRUE, 0, complain_overflow_dont,
287 bfd_elf_xtensa_reloc, "R_XTENSA_SLOT13_ALT", FALSE, 0, 0, TRUE),
288 HOWTO (R_XTENSA_SLOT14_ALT, 0, 0, 0, TRUE, 0, complain_overflow_dont,
289 bfd_elf_xtensa_reloc, "R_XTENSA_SLOT14_ALT", FALSE, 0, 0, TRUE),
294 fprintf (stderr, "Xtensa bfd reloc lookup %d (%s)\n", code, str)
299 static reloc_howto_type *
300 elf_xtensa_reloc_type_lookup (bfd *abfd ATTRIBUTE_UNUSED,
301 bfd_reloc_code_real_type code)
306 TRACE ("BFD_RELOC_NONE");
307 return &elf_howto_table[(unsigned) R_XTENSA_NONE ];
310 TRACE ("BFD_RELOC_32");
311 return &elf_howto_table[(unsigned) R_XTENSA_32 ];
313 case BFD_RELOC_32_PCREL:
314 TRACE ("BFD_RELOC_32_PCREL");
315 return &elf_howto_table[(unsigned) R_XTENSA_32_PCREL ];
317 case BFD_RELOC_XTENSA_DIFF8:
318 TRACE ("BFD_RELOC_XTENSA_DIFF8");
319 return &elf_howto_table[(unsigned) R_XTENSA_DIFF8 ];
321 case BFD_RELOC_XTENSA_DIFF16:
322 TRACE ("BFD_RELOC_XTENSA_DIFF16");
323 return &elf_howto_table[(unsigned) R_XTENSA_DIFF16 ];
325 case BFD_RELOC_XTENSA_DIFF32:
326 TRACE ("BFD_RELOC_XTENSA_DIFF32");
327 return &elf_howto_table[(unsigned) R_XTENSA_DIFF32 ];
329 case BFD_RELOC_XTENSA_RTLD:
330 TRACE ("BFD_RELOC_XTENSA_RTLD");
331 return &elf_howto_table[(unsigned) R_XTENSA_RTLD ];
333 case BFD_RELOC_XTENSA_GLOB_DAT:
334 TRACE ("BFD_RELOC_XTENSA_GLOB_DAT");
335 return &elf_howto_table[(unsigned) R_XTENSA_GLOB_DAT ];
337 case BFD_RELOC_XTENSA_JMP_SLOT:
338 TRACE ("BFD_RELOC_XTENSA_JMP_SLOT");
339 return &elf_howto_table[(unsigned) R_XTENSA_JMP_SLOT ];
341 case BFD_RELOC_XTENSA_RELATIVE:
342 TRACE ("BFD_RELOC_XTENSA_RELATIVE");
343 return &elf_howto_table[(unsigned) R_XTENSA_RELATIVE ];
345 case BFD_RELOC_XTENSA_PLT:
346 TRACE ("BFD_RELOC_XTENSA_PLT");
347 return &elf_howto_table[(unsigned) R_XTENSA_PLT ];
349 case BFD_RELOC_XTENSA_OP0:
350 TRACE ("BFD_RELOC_XTENSA_OP0");
351 return &elf_howto_table[(unsigned) R_XTENSA_OP0 ];
353 case BFD_RELOC_XTENSA_OP1:
354 TRACE ("BFD_RELOC_XTENSA_OP1");
355 return &elf_howto_table[(unsigned) R_XTENSA_OP1 ];
357 case BFD_RELOC_XTENSA_OP2:
358 TRACE ("BFD_RELOC_XTENSA_OP2");
359 return &elf_howto_table[(unsigned) R_XTENSA_OP2 ];
361 case BFD_RELOC_XTENSA_ASM_EXPAND:
362 TRACE ("BFD_RELOC_XTENSA_ASM_EXPAND");
363 return &elf_howto_table[(unsigned) R_XTENSA_ASM_EXPAND ];
365 case BFD_RELOC_XTENSA_ASM_SIMPLIFY:
366 TRACE ("BFD_RELOC_XTENSA_ASM_SIMPLIFY");
367 return &elf_howto_table[(unsigned) R_XTENSA_ASM_SIMPLIFY ];
369 case BFD_RELOC_VTABLE_INHERIT:
370 TRACE ("BFD_RELOC_VTABLE_INHERIT");
371 return &elf_howto_table[(unsigned) R_XTENSA_GNU_VTINHERIT ];
373 case BFD_RELOC_VTABLE_ENTRY:
374 TRACE ("BFD_RELOC_VTABLE_ENTRY");
375 return &elf_howto_table[(unsigned) R_XTENSA_GNU_VTENTRY ];
378 if (code >= BFD_RELOC_XTENSA_SLOT0_OP
379 && code <= BFD_RELOC_XTENSA_SLOT14_OP)
381 unsigned n = (R_XTENSA_SLOT0_OP +
382 (code - BFD_RELOC_XTENSA_SLOT0_OP));
383 return &elf_howto_table[n];
386 if (code >= BFD_RELOC_XTENSA_SLOT0_ALT
387 && code <= BFD_RELOC_XTENSA_SLOT14_ALT)
389 unsigned n = (R_XTENSA_SLOT0_ALT +
390 (code - BFD_RELOC_XTENSA_SLOT0_ALT));
391 return &elf_howto_table[n];
401 static reloc_howto_type *
402 elf_xtensa_reloc_name_lookup (bfd *abfd ATTRIBUTE_UNUSED,
407 for (i = 0; i < sizeof (elf_howto_table) / sizeof (elf_howto_table[0]); i++)
408 if (elf_howto_table[i].name != NULL
409 && strcasecmp (elf_howto_table[i].name, r_name) == 0)
410 return &elf_howto_table[i];
416 /* Given an ELF "rela" relocation, find the corresponding howto and record
417 it in the BFD internal arelent representation of the relocation. */
420 elf_xtensa_info_to_howto_rela (bfd *abfd ATTRIBUTE_UNUSED,
422 Elf_Internal_Rela *dst)
424 unsigned int r_type = ELF32_R_TYPE (dst->r_info);
426 BFD_ASSERT (r_type < (unsigned int) R_XTENSA_max);
427 cache_ptr->howto = &elf_howto_table[r_type];
431 /* Functions for the Xtensa ELF linker. */
433 /* The name of the dynamic interpreter. This is put in the .interp
436 #define ELF_DYNAMIC_INTERPRETER "/lib/ld.so"
438 /* The size in bytes of an entry in the procedure linkage table.
439 (This does _not_ include the space for the literals associated with
442 #define PLT_ENTRY_SIZE 16
444 /* For _really_ large PLTs, we may need to alternate between literals
445 and code to keep the literals within the 256K range of the L32R
446 instructions in the code. It's unlikely that anyone would ever need
447 such a big PLT, but an arbitrary limit on the PLT size would be bad.
448 Thus, we split the PLT into chunks. Since there's very little
449 overhead (2 extra literals) for each chunk, the chunk size is kept
450 small so that the code for handling multiple chunks get used and
451 tested regularly. With 254 entries, there are 1K of literals for
452 each chunk, and that seems like a nice round number. */
454 #define PLT_ENTRIES_PER_CHUNK 254
456 /* PLT entries are actually used as stub functions for lazy symbol
457 resolution. Once the symbol is resolved, the stub function is never
458 invoked. Note: the 32-byte frame size used here cannot be changed
459 without a corresponding change in the runtime linker. */
461 static const bfd_byte elf_xtensa_be_plt_entry[PLT_ENTRY_SIZE] =
463 0x6c, 0x10, 0x04, /* entry sp, 32 */
464 0x18, 0x00, 0x00, /* l32r a8, [got entry for rtld's resolver] */
465 0x1a, 0x00, 0x00, /* l32r a10, [got entry for rtld's link map] */
466 0x1b, 0x00, 0x00, /* l32r a11, [literal for reloc index] */
467 0x0a, 0x80, 0x00, /* jx a8 */
471 static const bfd_byte elf_xtensa_le_plt_entry[PLT_ENTRY_SIZE] =
473 0x36, 0x41, 0x00, /* entry sp, 32 */
474 0x81, 0x00, 0x00, /* l32r a8, [got entry for rtld's resolver] */
475 0xa1, 0x00, 0x00, /* l32r a10, [got entry for rtld's link map] */
476 0xb1, 0x00, 0x00, /* l32r a11, [literal for reloc index] */
477 0xa0, 0x08, 0x00, /* jx a8 */
481 /* Xtensa ELF linker hash table. */
483 struct elf_xtensa_link_hash_table
485 struct elf_link_hash_table elf;
487 /* Short-cuts to get to dynamic linker sections. */
494 asection *spltlittbl;
496 /* Total count of PLT relocations seen during check_relocs.
497 The actual PLT code must be split into multiple sections and all
498 the sections have to be created before size_dynamic_sections,
499 where we figure out the exact number of PLT entries that will be
500 needed. It is OK if this count is an overestimate, e.g., some
501 relocations may be removed by GC. */
505 /* Get the Xtensa ELF linker hash table from a link_info structure. */
507 #define elf_xtensa_hash_table(p) \
508 ((struct elf_xtensa_link_hash_table *) ((p)->hash))
510 /* Create an Xtensa ELF linker hash table. */
512 static struct bfd_link_hash_table *
513 elf_xtensa_link_hash_table_create (bfd *abfd)
515 struct elf_xtensa_link_hash_table *ret;
516 bfd_size_type amt = sizeof (struct elf_xtensa_link_hash_table);
518 ret = bfd_malloc (amt);
522 if (!_bfd_elf_link_hash_table_init (&ret->elf, abfd,
523 _bfd_elf_link_hash_newfunc,
524 sizeof (struct elf_link_hash_entry)))
536 ret->spltlittbl = NULL;
538 ret->plt_reloc_count = 0;
540 return &ret->elf.root;
543 static inline bfd_boolean
544 elf_xtensa_dynamic_symbol_p (struct elf_link_hash_entry *h,
545 struct bfd_link_info *info)
547 /* Check if we should do dynamic things to this symbol. The
548 "ignore_protected" argument need not be set, because Xtensa code
549 does not require special handling of STV_PROTECTED to make function
550 pointer comparisons work properly. The PLT addresses are never
551 used for function pointers. */
553 return _bfd_elf_dynamic_symbol_p (h, info, 0);
558 property_table_compare (const void *ap, const void *bp)
560 const property_table_entry *a = (const property_table_entry *) ap;
561 const property_table_entry *b = (const property_table_entry *) bp;
563 if (a->address == b->address)
565 if (a->size != b->size)
566 return (a->size - b->size);
568 if ((a->flags & XTENSA_PROP_ALIGN) != (b->flags & XTENSA_PROP_ALIGN))
569 return ((b->flags & XTENSA_PROP_ALIGN)
570 - (a->flags & XTENSA_PROP_ALIGN));
572 if ((a->flags & XTENSA_PROP_ALIGN)
573 && (GET_XTENSA_PROP_ALIGNMENT (a->flags)
574 != GET_XTENSA_PROP_ALIGNMENT (b->flags)))
575 return (GET_XTENSA_PROP_ALIGNMENT (a->flags)
576 - GET_XTENSA_PROP_ALIGNMENT (b->flags));
578 if ((a->flags & XTENSA_PROP_UNREACHABLE)
579 != (b->flags & XTENSA_PROP_UNREACHABLE))
580 return ((b->flags & XTENSA_PROP_UNREACHABLE)
581 - (a->flags & XTENSA_PROP_UNREACHABLE));
583 return (a->flags - b->flags);
586 return (a->address - b->address);
591 property_table_matches (const void *ap, const void *bp)
593 const property_table_entry *a = (const property_table_entry *) ap;
594 const property_table_entry *b = (const property_table_entry *) bp;
596 /* Check if one entry overlaps with the other. */
597 if ((b->address >= a->address && b->address < (a->address + a->size))
598 || (a->address >= b->address && a->address < (b->address + b->size)))
601 return (a->address - b->address);
605 /* Get the literal table or property table entries for the given
606 section. Sets TABLE_P and returns the number of entries. On
607 error, returns a negative value. */
610 xtensa_read_table_entries (bfd *abfd,
612 property_table_entry **table_p,
613 const char *sec_name,
614 bfd_boolean output_addr)
616 asection *table_section;
617 bfd_size_type table_size = 0;
618 bfd_byte *table_data;
619 property_table_entry *blocks;
620 int blk, block_count;
621 bfd_size_type num_records;
622 Elf_Internal_Rela *internal_relocs, *irel, *rel_end;
623 bfd_vma section_addr, off;
624 flagword predef_flags;
625 bfd_size_type table_entry_size, section_limit;
628 || !(section->flags & SEC_ALLOC)
629 || (section->flags & SEC_DEBUGGING))
635 table_section = xtensa_get_property_section (section, sec_name);
637 table_size = table_section->size;
645 predef_flags = xtensa_get_property_predef_flags (table_section);
646 table_entry_size = 12;
648 table_entry_size -= 4;
650 num_records = table_size / table_entry_size;
651 table_data = retrieve_contents (abfd, table_section, TRUE);
652 blocks = (property_table_entry *)
653 bfd_malloc (num_records * sizeof (property_table_entry));
657 section_addr = section->output_section->vma + section->output_offset;
659 section_addr = section->vma;
661 internal_relocs = retrieve_internal_relocs (abfd, table_section, TRUE);
662 if (internal_relocs && !table_section->reloc_done)
664 qsort (internal_relocs, table_section->reloc_count,
665 sizeof (Elf_Internal_Rela), internal_reloc_compare);
666 irel = internal_relocs;
671 section_limit = bfd_get_section_limit (abfd, section);
672 rel_end = internal_relocs + table_section->reloc_count;
674 for (off = 0; off < table_size; off += table_entry_size)
676 bfd_vma address = bfd_get_32 (abfd, table_data + off);
678 /* Skip any relocations before the current offset. This should help
679 avoid confusion caused by unexpected relocations for the preceding
682 (irel->r_offset < off
683 || (irel->r_offset == off
684 && ELF32_R_TYPE (irel->r_info) == R_XTENSA_NONE)))
691 if (irel && irel->r_offset == off)
694 unsigned long r_symndx = ELF32_R_SYM (irel->r_info);
695 BFD_ASSERT (ELF32_R_TYPE (irel->r_info) == R_XTENSA_32);
697 if (get_elf_r_symndx_section (abfd, r_symndx) != section)
700 sym_off = get_elf_r_symndx_offset (abfd, r_symndx);
701 BFD_ASSERT (sym_off == 0);
702 address += (section_addr + sym_off + irel->r_addend);
706 if (address < section_addr
707 || address >= section_addr + section_limit)
711 blocks[block_count].address = address;
712 blocks[block_count].size = bfd_get_32 (abfd, table_data + off + 4);
714 blocks[block_count].flags = predef_flags;
716 blocks[block_count].flags = bfd_get_32 (abfd, table_data + off + 8);
720 release_contents (table_section, table_data);
721 release_internal_relocs (table_section, internal_relocs);
725 /* Now sort them into address order for easy reference. */
726 qsort (blocks, block_count, sizeof (property_table_entry),
727 property_table_compare);
729 /* Check that the table contents are valid. Problems may occur,
730 for example, if an unrelocated object file is stripped. */
731 for (blk = 1; blk < block_count; blk++)
733 /* The only circumstance where two entries may legitimately
734 have the same address is when one of them is a zero-size
735 placeholder to mark a place where fill can be inserted.
736 The zero-size entry should come first. */
737 if (blocks[blk - 1].address == blocks[blk].address &&
738 blocks[blk - 1].size != 0)
740 (*_bfd_error_handler) (_("%B(%A): invalid property table"),
742 bfd_set_error (bfd_error_bad_value);
754 static property_table_entry *
755 elf_xtensa_find_property_entry (property_table_entry *property_table,
756 int property_table_size,
759 property_table_entry entry;
760 property_table_entry *rv;
762 if (property_table_size == 0)
765 entry.address = addr;
769 rv = bsearch (&entry, property_table, property_table_size,
770 sizeof (property_table_entry), property_table_matches);
776 elf_xtensa_in_literal_pool (property_table_entry *lit_table,
780 if (elf_xtensa_find_property_entry (lit_table, lit_table_size, addr))
787 /* Look through the relocs for a section during the first phase, and
788 calculate needed space in the dynamic reloc sections. */
791 elf_xtensa_check_relocs (bfd *abfd,
792 struct bfd_link_info *info,
794 const Elf_Internal_Rela *relocs)
796 struct elf_xtensa_link_hash_table *htab;
797 Elf_Internal_Shdr *symtab_hdr;
798 struct elf_link_hash_entry **sym_hashes;
799 const Elf_Internal_Rela *rel;
800 const Elf_Internal_Rela *rel_end;
802 if (info->relocatable)
805 htab = elf_xtensa_hash_table (info);
806 symtab_hdr = &elf_tdata (abfd)->symtab_hdr;
807 sym_hashes = elf_sym_hashes (abfd);
809 rel_end = relocs + sec->reloc_count;
810 for (rel = relocs; rel < rel_end; rel++)
813 unsigned long r_symndx;
814 struct elf_link_hash_entry *h;
816 r_symndx = ELF32_R_SYM (rel->r_info);
817 r_type = ELF32_R_TYPE (rel->r_info);
819 if (r_symndx >= NUM_SHDR_ENTRIES (symtab_hdr))
821 (*_bfd_error_handler) (_("%B: bad symbol index: %d"),
826 if (r_symndx < symtab_hdr->sh_info)
830 h = sym_hashes[r_symndx - symtab_hdr->sh_info];
831 while (h->root.type == bfd_link_hash_indirect
832 || h->root.type == bfd_link_hash_warning)
833 h = (struct elf_link_hash_entry *) h->root.u.i.link;
842 if ((sec->flags & SEC_ALLOC) != 0)
844 if (h->got.refcount <= 0)
847 h->got.refcount += 1;
852 /* If this relocation is against a local symbol, then it's
853 exactly the same as a normal local GOT entry. */
857 if ((sec->flags & SEC_ALLOC) != 0)
859 if (h->plt.refcount <= 0)
865 h->plt.refcount += 1;
867 /* Keep track of the total PLT relocation count even if we
868 don't yet know whether the dynamic sections will be
870 htab->plt_reloc_count += 1;
872 if (elf_hash_table (info)->dynamic_sections_created)
874 if (! add_extra_plt_sections (info, htab->plt_reloc_count))
881 if ((sec->flags & SEC_ALLOC) != 0)
883 bfd_signed_vma *local_got_refcounts;
885 /* This is a global offset table entry for a local symbol. */
886 local_got_refcounts = elf_local_got_refcounts (abfd);
887 if (local_got_refcounts == NULL)
891 size = symtab_hdr->sh_info;
892 size *= sizeof (bfd_signed_vma);
893 local_got_refcounts =
894 (bfd_signed_vma *) bfd_zalloc (abfd, size);
895 if (local_got_refcounts == NULL)
897 elf_local_got_refcounts (abfd) = local_got_refcounts;
899 local_got_refcounts[r_symndx] += 1;
903 case R_XTENSA_GNU_VTINHERIT:
904 /* This relocation describes the C++ object vtable hierarchy.
905 Reconstruct it for later use during GC. */
906 if (!bfd_elf_gc_record_vtinherit (abfd, sec, h, rel->r_offset))
910 case R_XTENSA_GNU_VTENTRY:
911 /* This relocation describes which C++ vtable entries are actually
912 used. Record for later use during GC. */
913 BFD_ASSERT (h != NULL);
915 && !bfd_elf_gc_record_vtentry (abfd, sec, h, rel->r_addend))
929 elf_xtensa_make_sym_local (struct bfd_link_info *info,
930 struct elf_link_hash_entry *h)
934 if (h->plt.refcount > 0)
936 /* For shared objects, there's no need for PLT entries for local
937 symbols (use RELATIVE relocs instead of JMP_SLOT relocs). */
938 if (h->got.refcount < 0)
940 h->got.refcount += h->plt.refcount;
946 /* Don't need any dynamic relocations at all. */
954 elf_xtensa_hide_symbol (struct bfd_link_info *info,
955 struct elf_link_hash_entry *h,
956 bfd_boolean force_local)
958 /* For a shared link, move the plt refcount to the got refcount to leave
959 space for RELATIVE relocs. */
960 elf_xtensa_make_sym_local (info, h);
962 _bfd_elf_link_hash_hide_symbol (info, h, force_local);
966 /* Return the section that should be marked against GC for a given
970 elf_xtensa_gc_mark_hook (asection *sec,
971 struct bfd_link_info *info,
972 Elf_Internal_Rela *rel,
973 struct elf_link_hash_entry *h,
974 Elf_Internal_Sym *sym)
976 /* Property sections are marked "KEEP" in the linker scripts, but they
977 should not cause other sections to be marked. (This approach relies
978 on elf_xtensa_discard_info to remove property table entries that
979 describe discarded sections. Alternatively, it might be more
980 efficient to avoid using "KEEP" in the linker scripts and instead use
981 the gc_mark_extra_sections hook to mark only the property sections
982 that describe marked sections. That alternative does not work well
983 with the current property table sections, which do not correspond
984 one-to-one with the sections they describe, but that should be fixed
986 if (xtensa_is_property_section (sec))
990 switch (ELF32_R_TYPE (rel->r_info))
992 case R_XTENSA_GNU_VTINHERIT:
993 case R_XTENSA_GNU_VTENTRY:
997 return _bfd_elf_gc_mark_hook (sec, info, rel, h, sym);
1001 /* Update the GOT & PLT entry reference counts
1002 for the section being removed. */
1005 elf_xtensa_gc_sweep_hook (bfd *abfd,
1006 struct bfd_link_info *info ATTRIBUTE_UNUSED,
1008 const Elf_Internal_Rela *relocs)
1010 Elf_Internal_Shdr *symtab_hdr;
1011 struct elf_link_hash_entry **sym_hashes;
1012 bfd_signed_vma *local_got_refcounts;
1013 const Elf_Internal_Rela *rel, *relend;
1015 if (info->relocatable)
1018 if ((sec->flags & SEC_ALLOC) == 0)
1021 symtab_hdr = &elf_tdata (abfd)->symtab_hdr;
1022 sym_hashes = elf_sym_hashes (abfd);
1023 local_got_refcounts = elf_local_got_refcounts (abfd);
1025 relend = relocs + sec->reloc_count;
1026 for (rel = relocs; rel < relend; rel++)
1028 unsigned long r_symndx;
1029 unsigned int r_type;
1030 struct elf_link_hash_entry *h = NULL;
1032 r_symndx = ELF32_R_SYM (rel->r_info);
1033 if (r_symndx >= symtab_hdr->sh_info)
1035 h = sym_hashes[r_symndx - symtab_hdr->sh_info];
1036 while (h->root.type == bfd_link_hash_indirect
1037 || h->root.type == bfd_link_hash_warning)
1038 h = (struct elf_link_hash_entry *) h->root.u.i.link;
1041 r_type = ELF32_R_TYPE (rel->r_info);
1047 if (h->got.refcount > 0)
1054 if (h->plt.refcount > 0)
1059 if (local_got_refcounts[r_symndx] > 0)
1060 local_got_refcounts[r_symndx] -= 1;
1072 /* Create all the dynamic sections. */
1075 elf_xtensa_create_dynamic_sections (bfd *dynobj, struct bfd_link_info *info)
1077 struct elf_xtensa_link_hash_table *htab;
1078 flagword flags, noalloc_flags;
1080 htab = elf_xtensa_hash_table (info);
1082 /* First do all the standard stuff. */
1083 if (! _bfd_elf_create_dynamic_sections (dynobj, info))
1085 htab->splt = bfd_get_section_by_name (dynobj, ".plt");
1086 htab->srelplt = bfd_get_section_by_name (dynobj, ".rela.plt");
1087 htab->sgot = bfd_get_section_by_name (dynobj, ".got");
1088 htab->sgotplt = bfd_get_section_by_name (dynobj, ".got.plt");
1090 /* Create any extra PLT sections in case check_relocs has already
1091 been called on all the non-dynamic input files. */
1092 if (! add_extra_plt_sections (info, htab->plt_reloc_count))
1095 noalloc_flags = (SEC_HAS_CONTENTS | SEC_IN_MEMORY
1096 | SEC_LINKER_CREATED | SEC_READONLY);
1097 flags = noalloc_flags | SEC_ALLOC | SEC_LOAD;
1099 /* Mark the ".got.plt" section READONLY. */
1100 if (htab->sgotplt == NULL
1101 || ! bfd_set_section_flags (dynobj, htab->sgotplt, flags))
1104 /* Create ".rela.got". */
1105 htab->srelgot = bfd_make_section_with_flags (dynobj, ".rela.got", flags);
1106 if (htab->srelgot == NULL
1107 || ! bfd_set_section_alignment (dynobj, htab->srelgot, 2))
1110 /* Create ".got.loc" (literal tables for use by dynamic linker). */
1111 htab->sgotloc = bfd_make_section_with_flags (dynobj, ".got.loc", flags);
1112 if (htab->sgotloc == NULL
1113 || ! bfd_set_section_alignment (dynobj, htab->sgotloc, 2))
1116 /* Create ".xt.lit.plt" (literal table for ".got.plt*"). */
1117 htab->spltlittbl = bfd_make_section_with_flags (dynobj, ".xt.lit.plt",
1119 if (htab->spltlittbl == NULL
1120 || ! bfd_set_section_alignment (dynobj, htab->spltlittbl, 2))
1128 add_extra_plt_sections (struct bfd_link_info *info, int count)
1130 bfd *dynobj = elf_hash_table (info)->dynobj;
1133 /* Iterate over all chunks except 0 which uses the standard ".plt" and
1134 ".got.plt" sections. */
1135 for (chunk = count / PLT_ENTRIES_PER_CHUNK; chunk > 0; chunk--)
1141 /* Stop when we find a section has already been created. */
1142 if (elf_xtensa_get_plt_section (info, chunk))
1145 flags = (SEC_ALLOC | SEC_LOAD | SEC_HAS_CONTENTS | SEC_IN_MEMORY
1146 | SEC_LINKER_CREATED | SEC_READONLY);
1148 sname = (char *) bfd_malloc (10);
1149 sprintf (sname, ".plt.%u", chunk);
1150 s = bfd_make_section_with_flags (dynobj, sname, flags | SEC_CODE);
1152 || ! bfd_set_section_alignment (dynobj, s, 2))
1155 sname = (char *) bfd_malloc (14);
1156 sprintf (sname, ".got.plt.%u", chunk);
1157 s = bfd_make_section_with_flags (dynobj, sname, flags);
1159 || ! bfd_set_section_alignment (dynobj, s, 2))
1167 /* Adjust a symbol defined by a dynamic object and referenced by a
1168 regular object. The current definition is in some section of the
1169 dynamic object, but we're not including those sections. We have to
1170 change the definition to something the rest of the link can
1174 elf_xtensa_adjust_dynamic_symbol (struct bfd_link_info *info ATTRIBUTE_UNUSED,
1175 struct elf_link_hash_entry *h)
1177 /* If this is a weak symbol, and there is a real definition, the
1178 processor independent code will have arranged for us to see the
1179 real definition first, and we can just use the same value. */
1182 BFD_ASSERT (h->u.weakdef->root.type == bfd_link_hash_defined
1183 || h->u.weakdef->root.type == bfd_link_hash_defweak);
1184 h->root.u.def.section = h->u.weakdef->root.u.def.section;
1185 h->root.u.def.value = h->u.weakdef->root.u.def.value;
1189 /* This is a reference to a symbol defined by a dynamic object. The
1190 reference must go through the GOT, so there's no need for COPY relocs,
1198 elf_xtensa_allocate_dynrelocs (struct elf_link_hash_entry *h, void *arg)
1200 struct bfd_link_info *info;
1201 struct elf_xtensa_link_hash_table *htab;
1202 bfd_boolean is_dynamic;
1204 if (h->root.type == bfd_link_hash_indirect)
1207 if (h->root.type == bfd_link_hash_warning)
1208 h = (struct elf_link_hash_entry *) h->root.u.i.link;
1210 info = (struct bfd_link_info *) arg;
1211 htab = elf_xtensa_hash_table (info);
1213 is_dynamic = elf_xtensa_dynamic_symbol_p (h, info);
1216 elf_xtensa_make_sym_local (info, h);
1218 if (h->plt.refcount > 0)
1219 htab->srelplt->size += (h->plt.refcount * sizeof (Elf32_External_Rela));
1221 if (h->got.refcount > 0)
1222 htab->srelgot->size += (h->got.refcount * sizeof (Elf32_External_Rela));
1229 elf_xtensa_allocate_local_got_size (struct bfd_link_info *info)
1231 struct elf_xtensa_link_hash_table *htab;
1234 htab = elf_xtensa_hash_table (info);
1236 for (i = info->input_bfds; i; i = i->link_next)
1238 bfd_signed_vma *local_got_refcounts;
1239 bfd_size_type j, cnt;
1240 Elf_Internal_Shdr *symtab_hdr;
1242 local_got_refcounts = elf_local_got_refcounts (i);
1243 if (!local_got_refcounts)
1246 symtab_hdr = &elf_tdata (i)->symtab_hdr;
1247 cnt = symtab_hdr->sh_info;
1249 for (j = 0; j < cnt; ++j)
1251 if (local_got_refcounts[j] > 0)
1252 htab->srelgot->size += (local_got_refcounts[j]
1253 * sizeof (Elf32_External_Rela));
1259 /* Set the sizes of the dynamic sections. */
1262 elf_xtensa_size_dynamic_sections (bfd *output_bfd ATTRIBUTE_UNUSED,
1263 struct bfd_link_info *info)
1265 struct elf_xtensa_link_hash_table *htab;
1267 asection *s, *srelplt, *splt, *sgotplt, *srelgot, *spltlittbl, *sgotloc;
1268 bfd_boolean relplt, relgot;
1269 int plt_entries, plt_chunks, chunk;
1274 htab = elf_xtensa_hash_table (info);
1275 dynobj = elf_hash_table (info)->dynobj;
1278 srelgot = htab->srelgot;
1279 srelplt = htab->srelplt;
1281 if (elf_hash_table (info)->dynamic_sections_created)
1283 BFD_ASSERT (htab->srelgot != NULL
1284 && htab->srelplt != NULL
1285 && htab->sgot != NULL
1286 && htab->spltlittbl != NULL
1287 && htab->sgotloc != NULL);
1289 /* Set the contents of the .interp section to the interpreter. */
1290 if (info->executable)
1292 s = bfd_get_section_by_name (dynobj, ".interp");
1295 s->size = sizeof ELF_DYNAMIC_INTERPRETER;
1296 s->contents = (unsigned char *) ELF_DYNAMIC_INTERPRETER;
1299 /* Allocate room for one word in ".got". */
1300 htab->sgot->size = 4;
1302 /* Allocate space in ".rela.got" for literals that reference global
1303 symbols and space in ".rela.plt" for literals that have PLT
1305 elf_link_hash_traverse (elf_hash_table (info),
1306 elf_xtensa_allocate_dynrelocs,
1309 /* If we are generating a shared object, we also need space in
1310 ".rela.got" for R_XTENSA_RELATIVE relocs for literals that
1311 reference local symbols. */
1313 elf_xtensa_allocate_local_got_size (info);
1315 /* Allocate space in ".plt" to match the size of ".rela.plt". For
1316 each PLT entry, we need the PLT code plus a 4-byte literal.
1317 For each chunk of ".plt", we also need two more 4-byte
1318 literals, two corresponding entries in ".rela.got", and an
1319 8-byte entry in ".xt.lit.plt". */
1320 spltlittbl = htab->spltlittbl;
1321 plt_entries = srelplt->size / sizeof (Elf32_External_Rela);
1323 (plt_entries + PLT_ENTRIES_PER_CHUNK - 1) / PLT_ENTRIES_PER_CHUNK;
1325 /* Iterate over all the PLT chunks, including any extra sections
1326 created earlier because the initial count of PLT relocations
1327 was an overestimate. */
1329 (splt = elf_xtensa_get_plt_section (info, chunk)) != NULL;
1334 sgotplt = elf_xtensa_get_gotplt_section (info, chunk);
1335 BFD_ASSERT (sgotplt != NULL);
1337 if (chunk < plt_chunks - 1)
1338 chunk_entries = PLT_ENTRIES_PER_CHUNK;
1339 else if (chunk == plt_chunks - 1)
1340 chunk_entries = plt_entries - (chunk * PLT_ENTRIES_PER_CHUNK);
1344 if (chunk_entries != 0)
1346 sgotplt->size = 4 * (chunk_entries + 2);
1347 splt->size = PLT_ENTRY_SIZE * chunk_entries;
1348 srelgot->size += 2 * sizeof (Elf32_External_Rela);
1349 spltlittbl->size += 8;
1358 /* Allocate space in ".got.loc" to match the total size of all the
1360 sgotloc = htab->sgotloc;
1361 sgotloc->size = spltlittbl->size;
1362 for (abfd = info->input_bfds; abfd != NULL; abfd = abfd->link_next)
1364 if (abfd->flags & DYNAMIC)
1366 for (s = abfd->sections; s != NULL; s = s->next)
1368 if (! elf_discarded_section (s)
1369 && xtensa_is_littable_section (s)
1371 sgotloc->size += s->size;
1376 /* Allocate memory for dynamic sections. */
1379 for (s = dynobj->sections; s != NULL; s = s->next)
1383 if ((s->flags & SEC_LINKER_CREATED) == 0)
1386 /* It's OK to base decisions on the section name, because none
1387 of the dynobj section names depend upon the input files. */
1388 name = bfd_get_section_name (dynobj, s);
1390 if (CONST_STRNEQ (name, ".rela"))
1394 if (strcmp (name, ".rela.plt") == 0)
1396 else if (strcmp (name, ".rela.got") == 0)
1399 /* We use the reloc_count field as a counter if we need
1400 to copy relocs into the output file. */
1404 else if (! CONST_STRNEQ (name, ".plt.")
1405 && ! CONST_STRNEQ (name, ".got.plt.")
1406 && strcmp (name, ".got") != 0
1407 && strcmp (name, ".plt") != 0
1408 && strcmp (name, ".got.plt") != 0
1409 && strcmp (name, ".xt.lit.plt") != 0
1410 && strcmp (name, ".got.loc") != 0)
1412 /* It's not one of our sections, so don't allocate space. */
1418 /* If we don't need this section, strip it from the output
1419 file. We must create the ".plt*" and ".got.plt*"
1420 sections in create_dynamic_sections and/or check_relocs
1421 based on a conservative estimate of the PLT relocation
1422 count, because the sections must be created before the
1423 linker maps input sections to output sections. The
1424 linker does that before size_dynamic_sections, where we
1425 compute the exact size of the PLT, so there may be more
1426 of these sections than are actually needed. */
1427 s->flags |= SEC_EXCLUDE;
1429 else if ((s->flags & SEC_HAS_CONTENTS) != 0)
1431 /* Allocate memory for the section contents. */
1432 s->contents = (bfd_byte *) bfd_zalloc (dynobj, s->size);
1433 if (s->contents == NULL)
1438 if (elf_hash_table (info)->dynamic_sections_created)
1440 /* Add the special XTENSA_RTLD relocations now. The offsets won't be
1441 known until finish_dynamic_sections, but we need to get the relocs
1442 in place before they are sorted. */
1443 for (chunk = 0; chunk < plt_chunks; chunk++)
1445 Elf_Internal_Rela irela;
1449 irela.r_info = ELF32_R_INFO (0, R_XTENSA_RTLD);
1452 loc = (srelgot->contents
1453 + srelgot->reloc_count * sizeof (Elf32_External_Rela));
1454 bfd_elf32_swap_reloca_out (output_bfd, &irela, loc);
1455 bfd_elf32_swap_reloca_out (output_bfd, &irela,
1456 loc + sizeof (Elf32_External_Rela));
1457 srelgot->reloc_count += 2;
1460 /* Add some entries to the .dynamic section. We fill in the
1461 values later, in elf_xtensa_finish_dynamic_sections, but we
1462 must add the entries now so that we get the correct size for
1463 the .dynamic section. The DT_DEBUG entry is filled in by the
1464 dynamic linker and used by the debugger. */
1465 #define add_dynamic_entry(TAG, VAL) \
1466 _bfd_elf_add_dynamic_entry (info, TAG, VAL)
1468 if (info->executable)
1470 if (!add_dynamic_entry (DT_DEBUG, 0))
1476 if (!add_dynamic_entry (DT_PLTRELSZ, 0)
1477 || !add_dynamic_entry (DT_PLTREL, DT_RELA)
1478 || !add_dynamic_entry (DT_JMPREL, 0))
1484 if (!add_dynamic_entry (DT_RELA, 0)
1485 || !add_dynamic_entry (DT_RELASZ, 0)
1486 || !add_dynamic_entry (DT_RELAENT, sizeof (Elf32_External_Rela)))
1490 if (!add_dynamic_entry (DT_PLTGOT, 0)
1491 || !add_dynamic_entry (DT_XTENSA_GOT_LOC_OFF, 0)
1492 || !add_dynamic_entry (DT_XTENSA_GOT_LOC_SZ, 0))
1495 #undef add_dynamic_entry
1501 /* Perform the specified relocation. The instruction at (contents + address)
1502 is modified to set one operand to represent the value in "relocation". The
1503 operand position is determined by the relocation type recorded in the
1506 #define CALL_SEGMENT_BITS (30)
1507 #define CALL_SEGMENT_SIZE (1 << CALL_SEGMENT_BITS)
1509 static bfd_reloc_status_type
1510 elf_xtensa_do_reloc (reloc_howto_type *howto,
1512 asection *input_section,
1516 bfd_boolean is_weak_undef,
1517 char **error_message)
1520 xtensa_opcode opcode;
1521 xtensa_isa isa = xtensa_default_isa;
1522 static xtensa_insnbuf ibuff = NULL;
1523 static xtensa_insnbuf sbuff = NULL;
1524 bfd_vma self_address;
1525 bfd_size_type input_size;
1531 ibuff = xtensa_insnbuf_alloc (isa);
1532 sbuff = xtensa_insnbuf_alloc (isa);
1535 input_size = bfd_get_section_limit (abfd, input_section);
1537 /* Calculate the PC address for this instruction. */
1538 self_address = (input_section->output_section->vma
1539 + input_section->output_offset
1542 switch (howto->type)
1545 case R_XTENSA_DIFF8:
1546 case R_XTENSA_DIFF16:
1547 case R_XTENSA_DIFF32:
1548 return bfd_reloc_ok;
1550 case R_XTENSA_ASM_EXPAND:
1553 /* Check for windowed CALL across a 1GB boundary. */
1554 xtensa_opcode opcode =
1555 get_expanded_call_opcode (contents + address,
1556 input_size - address, 0);
1557 if (is_windowed_call_opcode (opcode))
1559 if ((self_address >> CALL_SEGMENT_BITS)
1560 != (relocation >> CALL_SEGMENT_BITS))
1562 *error_message = "windowed longcall crosses 1GB boundary; "
1564 return bfd_reloc_dangerous;
1568 return bfd_reloc_ok;
1570 case R_XTENSA_ASM_SIMPLIFY:
1572 /* Convert the L32R/CALLX to CALL. */
1573 bfd_reloc_status_type retval =
1574 elf_xtensa_do_asm_simplify (contents, address, input_size,
1576 if (retval != bfd_reloc_ok)
1577 return bfd_reloc_dangerous;
1579 /* The CALL needs to be relocated. Continue below for that part. */
1582 howto = &elf_howto_table[(unsigned) R_XTENSA_SLOT0_OP ];
1590 x = bfd_get_32 (abfd, contents + address);
1592 bfd_put_32 (abfd, x, contents + address);
1594 return bfd_reloc_ok;
1596 case R_XTENSA_32_PCREL:
1597 bfd_put_32 (abfd, relocation - self_address, contents + address);
1598 return bfd_reloc_ok;
1601 /* Only instruction slot-specific relocations handled below.... */
1602 slot = get_relocation_slot (howto->type);
1603 if (slot == XTENSA_UNDEFINED)
1605 *error_message = "unexpected relocation";
1606 return bfd_reloc_dangerous;
1609 /* Read the instruction into a buffer and decode the opcode. */
1610 xtensa_insnbuf_from_chars (isa, ibuff, contents + address,
1611 input_size - address);
1612 fmt = xtensa_format_decode (isa, ibuff);
1613 if (fmt == XTENSA_UNDEFINED)
1615 *error_message = "cannot decode instruction format";
1616 return bfd_reloc_dangerous;
1619 xtensa_format_get_slot (isa, fmt, slot, ibuff, sbuff);
1621 opcode = xtensa_opcode_decode (isa, fmt, slot, sbuff);
1622 if (opcode == XTENSA_UNDEFINED)
1624 *error_message = "cannot decode instruction opcode";
1625 return bfd_reloc_dangerous;
1628 /* Check for opcode-specific "alternate" relocations. */
1629 if (is_alt_relocation (howto->type))
1631 if (opcode == get_l32r_opcode ())
1633 /* Handle the special-case of non-PC-relative L32R instructions. */
1634 bfd *output_bfd = input_section->output_section->owner;
1635 asection *lit4_sec = bfd_get_section_by_name (output_bfd, ".lit4");
1638 *error_message = "relocation references missing .lit4 section";
1639 return bfd_reloc_dangerous;
1641 self_address = ((lit4_sec->vma & ~0xfff)
1642 + 0x40000 - 3); /* -3 to compensate for do_reloc */
1643 newval = relocation;
1646 else if (opcode == get_const16_opcode ())
1648 /* ALT used for high 16 bits. */
1649 newval = relocation >> 16;
1654 /* No other "alternate" relocations currently defined. */
1655 *error_message = "unexpected relocation";
1656 return bfd_reloc_dangerous;
1659 else /* Not an "alternate" relocation.... */
1661 if (opcode == get_const16_opcode ())
1663 newval = relocation & 0xffff;
1668 /* ...normal PC-relative relocation.... */
1670 /* Determine which operand is being relocated. */
1671 opnd = get_relocation_opnd (opcode, howto->type);
1672 if (opnd == XTENSA_UNDEFINED)
1674 *error_message = "unexpected relocation";
1675 return bfd_reloc_dangerous;
1678 if (!howto->pc_relative)
1680 *error_message = "expected PC-relative relocation";
1681 return bfd_reloc_dangerous;
1684 newval = relocation;
1688 /* Apply the relocation. */
1689 if (xtensa_operand_do_reloc (isa, opcode, opnd, &newval, self_address)
1690 || xtensa_operand_encode (isa, opcode, opnd, &newval)
1691 || xtensa_operand_set_field (isa, opcode, opnd, fmt, slot,
1694 const char *opname = xtensa_opcode_name (isa, opcode);
1697 msg = "cannot encode";
1698 if (is_direct_call_opcode (opcode))
1700 if ((relocation & 0x3) != 0)
1701 msg = "misaligned call target";
1703 msg = "call target out of range";
1705 else if (opcode == get_l32r_opcode ())
1707 if ((relocation & 0x3) != 0)
1708 msg = "misaligned literal target";
1709 else if (is_alt_relocation (howto->type))
1710 msg = "literal target out of range (too many literals)";
1711 else if (self_address > relocation)
1712 msg = "literal target out of range (try using text-section-literals)";
1714 msg = "literal placed after use";
1717 *error_message = vsprint_msg (opname, ": %s", strlen (msg) + 2, msg);
1718 return bfd_reloc_dangerous;
1721 /* Check for calls across 1GB boundaries. */
1722 if (is_direct_call_opcode (opcode)
1723 && is_windowed_call_opcode (opcode))
1725 if ((self_address >> CALL_SEGMENT_BITS)
1726 != (relocation >> CALL_SEGMENT_BITS))
1729 "windowed call crosses 1GB boundary; return may fail";
1730 return bfd_reloc_dangerous;
1734 /* Write the modified instruction back out of the buffer. */
1735 xtensa_format_set_slot (isa, fmt, slot, ibuff, sbuff);
1736 xtensa_insnbuf_to_chars (isa, ibuff, contents + address,
1737 input_size - address);
1738 return bfd_reloc_ok;
1743 vsprint_msg (const char *origmsg, const char *fmt, int arglen, ...)
1745 /* To reduce the size of the memory leak,
1746 we only use a single message buffer. */
1747 static bfd_size_type alloc_size = 0;
1748 static char *message = NULL;
1749 bfd_size_type orig_len, len = 0;
1750 bfd_boolean is_append;
1752 VA_OPEN (ap, arglen);
1753 VA_FIXEDARG (ap, const char *, origmsg);
1755 is_append = (origmsg == message);
1757 orig_len = strlen (origmsg);
1758 len = orig_len + strlen (fmt) + arglen + 20;
1759 if (len > alloc_size)
1761 message = (char *) bfd_realloc_or_free (message, len);
1764 if (message != NULL)
1767 memcpy (message, origmsg, orig_len);
1768 vsprintf (message + orig_len, fmt, ap);
1775 /* This function is registered as the "special_function" in the
1776 Xtensa howto for handling simplify operations.
1777 bfd_perform_relocation / bfd_install_relocation use it to
1778 perform (install) the specified relocation. Since this replaces the code
1779 in bfd_perform_relocation, it is basically an Xtensa-specific,
1780 stripped-down version of bfd_perform_relocation. */
1782 static bfd_reloc_status_type
1783 bfd_elf_xtensa_reloc (bfd *abfd,
1784 arelent *reloc_entry,
1787 asection *input_section,
1789 char **error_message)
1792 bfd_reloc_status_type flag;
1793 bfd_size_type octets = reloc_entry->address * bfd_octets_per_byte (abfd);
1794 bfd_vma output_base = 0;
1795 reloc_howto_type *howto = reloc_entry->howto;
1796 asection *reloc_target_output_section;
1797 bfd_boolean is_weak_undef;
1799 if (!xtensa_default_isa)
1800 xtensa_default_isa = xtensa_isa_init (0, 0);
1802 /* ELF relocs are against symbols. If we are producing relocatable
1803 output, and the reloc is against an external symbol, the resulting
1804 reloc will also be against the same symbol. In such a case, we
1805 don't want to change anything about the way the reloc is handled,
1806 since it will all be done at final link time. This test is similar
1807 to what bfd_elf_generic_reloc does except that it lets relocs with
1808 howto->partial_inplace go through even if the addend is non-zero.
1809 (The real problem is that partial_inplace is set for XTENSA_32
1810 relocs to begin with, but that's a long story and there's little we
1811 can do about it now....) */
1813 if (output_bfd && (symbol->flags & BSF_SECTION_SYM) == 0)
1815 reloc_entry->address += input_section->output_offset;
1816 return bfd_reloc_ok;
1819 /* Is the address of the relocation really within the section? */
1820 if (reloc_entry->address > bfd_get_section_limit (abfd, input_section))
1821 return bfd_reloc_outofrange;
1823 /* Work out which section the relocation is targeted at and the
1824 initial relocation command value. */
1826 /* Get symbol value. (Common symbols are special.) */
1827 if (bfd_is_com_section (symbol->section))
1830 relocation = symbol->value;
1832 reloc_target_output_section = symbol->section->output_section;
1834 /* Convert input-section-relative symbol value to absolute. */
1835 if ((output_bfd && !howto->partial_inplace)
1836 || reloc_target_output_section == NULL)
1839 output_base = reloc_target_output_section->vma;
1841 relocation += output_base + symbol->section->output_offset;
1843 /* Add in supplied addend. */
1844 relocation += reloc_entry->addend;
1846 /* Here the variable relocation holds the final address of the
1847 symbol we are relocating against, plus any addend. */
1850 if (!howto->partial_inplace)
1852 /* This is a partial relocation, and we want to apply the relocation
1853 to the reloc entry rather than the raw data. Everything except
1854 relocations against section symbols has already been handled
1857 BFD_ASSERT (symbol->flags & BSF_SECTION_SYM);
1858 reloc_entry->addend = relocation;
1859 reloc_entry->address += input_section->output_offset;
1860 return bfd_reloc_ok;
1864 reloc_entry->address += input_section->output_offset;
1865 reloc_entry->addend = 0;
1869 is_weak_undef = (bfd_is_und_section (symbol->section)
1870 && (symbol->flags & BSF_WEAK) != 0);
1871 flag = elf_xtensa_do_reloc (howto, abfd, input_section, relocation,
1872 (bfd_byte *) data, (bfd_vma) octets,
1873 is_weak_undef, error_message);
1875 if (flag == bfd_reloc_dangerous)
1877 /* Add the symbol name to the error message. */
1878 if (! *error_message)
1879 *error_message = "";
1880 *error_message = vsprint_msg (*error_message, ": (%s + 0x%lx)",
1881 strlen (symbol->name) + 17,
1883 (unsigned long) reloc_entry->addend);
1890 /* Set up an entry in the procedure linkage table. */
1893 elf_xtensa_create_plt_entry (struct bfd_link_info *info,
1895 unsigned reloc_index)
1897 asection *splt, *sgotplt;
1898 bfd_vma plt_base, got_base;
1899 bfd_vma code_offset, lit_offset;
1902 chunk = reloc_index / PLT_ENTRIES_PER_CHUNK;
1903 splt = elf_xtensa_get_plt_section (info, chunk);
1904 sgotplt = elf_xtensa_get_gotplt_section (info, chunk);
1905 BFD_ASSERT (splt != NULL && sgotplt != NULL);
1907 plt_base = splt->output_section->vma + splt->output_offset;
1908 got_base = sgotplt->output_section->vma + sgotplt->output_offset;
1910 lit_offset = 8 + (reloc_index % PLT_ENTRIES_PER_CHUNK) * 4;
1911 code_offset = (reloc_index % PLT_ENTRIES_PER_CHUNK) * PLT_ENTRY_SIZE;
1913 /* Fill in the literal entry. This is the offset of the dynamic
1914 relocation entry. */
1915 bfd_put_32 (output_bfd, reloc_index * sizeof (Elf32_External_Rela),
1916 sgotplt->contents + lit_offset);
1918 /* Fill in the entry in the procedure linkage table. */
1919 memcpy (splt->contents + code_offset,
1920 (bfd_big_endian (output_bfd)
1921 ? elf_xtensa_be_plt_entry
1922 : elf_xtensa_le_plt_entry),
1924 bfd_put_16 (output_bfd, l32r_offset (got_base + 0,
1925 plt_base + code_offset + 3),
1926 splt->contents + code_offset + 4);
1927 bfd_put_16 (output_bfd, l32r_offset (got_base + 4,
1928 plt_base + code_offset + 6),
1929 splt->contents + code_offset + 7);
1930 bfd_put_16 (output_bfd, l32r_offset (got_base + lit_offset,
1931 plt_base + code_offset + 9),
1932 splt->contents + code_offset + 10);
1934 return plt_base + code_offset;
1938 /* Relocate an Xtensa ELF section. This is invoked by the linker for
1939 both relocatable and final links. */
1942 elf_xtensa_relocate_section (bfd *output_bfd,
1943 struct bfd_link_info *info,
1945 asection *input_section,
1947 Elf_Internal_Rela *relocs,
1948 Elf_Internal_Sym *local_syms,
1949 asection **local_sections)
1951 struct elf_xtensa_link_hash_table *htab;
1952 Elf_Internal_Shdr *symtab_hdr;
1953 Elf_Internal_Rela *rel;
1954 Elf_Internal_Rela *relend;
1955 struct elf_link_hash_entry **sym_hashes;
1956 property_table_entry *lit_table = 0;
1958 char *error_message = NULL;
1959 bfd_size_type input_size;
1961 if (!xtensa_default_isa)
1962 xtensa_default_isa = xtensa_isa_init (0, 0);
1964 htab = elf_xtensa_hash_table (info);
1965 symtab_hdr = &elf_tdata (input_bfd)->symtab_hdr;
1966 sym_hashes = elf_sym_hashes (input_bfd);
1968 if (elf_hash_table (info)->dynamic_sections_created)
1970 ltblsize = xtensa_read_table_entries (input_bfd, input_section,
1971 &lit_table, XTENSA_LIT_SEC_NAME,
1977 input_size = bfd_get_section_limit (input_bfd, input_section);
1980 relend = relocs + input_section->reloc_count;
1981 for (; rel < relend; rel++)
1984 reloc_howto_type *howto;
1985 unsigned long r_symndx;
1986 struct elf_link_hash_entry *h;
1987 Elf_Internal_Sym *sym;
1990 bfd_reloc_status_type r;
1991 bfd_boolean is_weak_undef;
1992 bfd_boolean unresolved_reloc;
1995 r_type = ELF32_R_TYPE (rel->r_info);
1996 if (r_type == (int) R_XTENSA_GNU_VTINHERIT
1997 || r_type == (int) R_XTENSA_GNU_VTENTRY)
2000 if (r_type < 0 || r_type >= (int) R_XTENSA_max)
2002 bfd_set_error (bfd_error_bad_value);
2005 howto = &elf_howto_table[r_type];
2007 r_symndx = ELF32_R_SYM (rel->r_info);
2012 is_weak_undef = FALSE;
2013 unresolved_reloc = FALSE;
2016 if (howto->partial_inplace && !info->relocatable)
2018 /* Because R_XTENSA_32 was made partial_inplace to fix some
2019 problems with DWARF info in partial links, there may be
2020 an addend stored in the contents. Take it out of there
2021 and move it back into the addend field of the reloc. */
2022 rel->r_addend += bfd_get_32 (input_bfd, contents + rel->r_offset);
2023 bfd_put_32 (input_bfd, 0, contents + rel->r_offset);
2026 if (r_symndx < symtab_hdr->sh_info)
2028 sym = local_syms + r_symndx;
2029 sec = local_sections[r_symndx];
2030 relocation = _bfd_elf_rela_local_sym (output_bfd, sym, &sec, rel);
2034 RELOC_FOR_GLOBAL_SYMBOL (info, input_bfd, input_section, rel,
2035 r_symndx, symtab_hdr, sym_hashes,
2037 unresolved_reloc, warned);
2040 && !unresolved_reloc
2041 && h->root.type == bfd_link_hash_undefweak)
2042 is_weak_undef = TRUE;
2045 if (sec != NULL && elf_discarded_section (sec))
2047 /* For relocs against symbols from removed linkonce sections,
2048 or sections discarded by a linker script, we just want the
2049 section contents zeroed. Avoid any special processing. */
2050 _bfd_clear_contents (howto, input_bfd, contents + rel->r_offset);
2056 if (info->relocatable)
2058 /* This is a relocatable link.
2059 1) If the reloc is against a section symbol, adjust
2060 according to the output section.
2061 2) If there is a new target for this relocation,
2062 the new target will be in the same output section.
2063 We adjust the relocation by the output section
2066 if (relaxing_section)
2068 /* Check if this references a section in another input file. */
2069 if (!do_fix_for_relocatable_link (rel, input_bfd, input_section,
2074 if (r_type == R_XTENSA_ASM_SIMPLIFY)
2076 char *error_message = NULL;
2077 /* Convert ASM_SIMPLIFY into the simpler relocation
2078 so that they never escape a relaxing link. */
2079 r = contract_asm_expansion (contents, input_size, rel,
2081 if (r != bfd_reloc_ok)
2083 if (!((*info->callbacks->reloc_dangerous)
2084 (info, error_message, input_bfd, input_section,
2088 r_type = ELF32_R_TYPE (rel->r_info);
2091 /* This is a relocatable link, so we don't have to change
2092 anything unless the reloc is against a section symbol,
2093 in which case we have to adjust according to where the
2094 section symbol winds up in the output section. */
2095 if (r_symndx < symtab_hdr->sh_info)
2097 sym = local_syms + r_symndx;
2098 if (ELF_ST_TYPE (sym->st_info) == STT_SECTION)
2100 sec = local_sections[r_symndx];
2101 rel->r_addend += sec->output_offset + sym->st_value;
2105 /* If there is an addend with a partial_inplace howto,
2106 then move the addend to the contents. This is a hack
2107 to work around problems with DWARF in relocatable links
2108 with some previous version of BFD. Now we can't easily get
2109 rid of the hack without breaking backward compatibility.... */
2112 howto = &elf_howto_table[r_type];
2113 if (howto->partial_inplace)
2115 r = elf_xtensa_do_reloc (howto, input_bfd, input_section,
2116 rel->r_addend, contents,
2117 rel->r_offset, FALSE,
2119 if (r != bfd_reloc_ok)
2121 if (!((*info->callbacks->reloc_dangerous)
2122 (info, error_message, input_bfd, input_section,
2130 /* Done with work for relocatable link; continue with next reloc. */
2134 /* This is a final link. */
2136 if (relaxing_section)
2138 /* Check if this references a section in another input file. */
2139 do_fix_for_final_link (rel, input_bfd, input_section, contents,
2143 /* Sanity check the address. */
2144 if (rel->r_offset >= input_size
2145 && ELF32_R_TYPE (rel->r_info) != R_XTENSA_NONE)
2147 (*_bfd_error_handler)
2148 (_("%B(%A+0x%lx): relocation offset out of range (size=0x%x)"),
2149 input_bfd, input_section, rel->r_offset, input_size);
2150 bfd_set_error (bfd_error_bad_value);
2154 /* Generate dynamic relocations. */
2155 if (elf_hash_table (info)->dynamic_sections_created)
2157 bfd_boolean dynamic_symbol = elf_xtensa_dynamic_symbol_p (h, info);
2159 if (dynamic_symbol && (is_operand_relocation (r_type)
2160 || r_type == R_XTENSA_32_PCREL))
2162 const char *name = h->root.root.string;
2164 vsprint_msg ("invalid relocation for dynamic symbol", ": %s",
2165 strlen (name) + 2, name);
2166 if (!((*info->callbacks->reloc_dangerous)
2167 (info, error_message, input_bfd, input_section,
2172 else if ((r_type == R_XTENSA_32 || r_type == R_XTENSA_PLT)
2173 && (input_section->flags & SEC_ALLOC) != 0
2174 && (dynamic_symbol || info->shared))
2176 Elf_Internal_Rela outrel;
2180 if (dynamic_symbol && r_type == R_XTENSA_PLT)
2181 srel = htab->srelplt;
2183 srel = htab->srelgot;
2185 BFD_ASSERT (srel != NULL);
2188 _bfd_elf_section_offset (output_bfd, info,
2189 input_section, rel->r_offset);
2191 if ((outrel.r_offset | 1) == (bfd_vma) -1)
2192 memset (&outrel, 0, sizeof outrel);
2195 outrel.r_offset += (input_section->output_section->vma
2196 + input_section->output_offset);
2198 /* Complain if the relocation is in a read-only section
2199 and not in a literal pool. */
2200 if ((input_section->flags & SEC_READONLY) != 0
2201 && !elf_xtensa_in_literal_pool (lit_table, ltblsize,
2205 _("dynamic relocation in read-only section");
2206 if (!((*info->callbacks->reloc_dangerous)
2207 (info, error_message, input_bfd, input_section,
2214 outrel.r_addend = rel->r_addend;
2217 if (r_type == R_XTENSA_32)
2220 ELF32_R_INFO (h->dynindx, R_XTENSA_GLOB_DAT);
2223 else /* r_type == R_XTENSA_PLT */
2226 ELF32_R_INFO (h->dynindx, R_XTENSA_JMP_SLOT);
2228 /* Create the PLT entry and set the initial
2229 contents of the literal entry to the address of
2232 elf_xtensa_create_plt_entry (info, output_bfd,
2235 unresolved_reloc = FALSE;
2239 /* Generate a RELATIVE relocation. */
2240 outrel.r_info = ELF32_R_INFO (0, R_XTENSA_RELATIVE);
2241 outrel.r_addend = 0;
2245 loc = (srel->contents
2246 + srel->reloc_count++ * sizeof (Elf32_External_Rela));
2247 bfd_elf32_swap_reloca_out (output_bfd, &outrel, loc);
2248 BFD_ASSERT (sizeof (Elf32_External_Rela) * srel->reloc_count
2251 else if (r_type == R_XTENSA_ASM_EXPAND && dynamic_symbol)
2253 /* This should only happen for non-PIC code, which is not
2254 supposed to be used on systems with dynamic linking.
2255 Just ignore these relocations. */
2260 /* Dynamic relocs are not propagated for SEC_DEBUGGING sections
2261 because such sections are not SEC_ALLOC and thus ld.so will
2262 not process them. */
2263 if (unresolved_reloc
2264 && !((input_section->flags & SEC_DEBUGGING) != 0
2267 (*_bfd_error_handler)
2268 (_("%B(%A+0x%lx): unresolvable %s relocation against symbol `%s'"),
2271 (long) rel->r_offset,
2273 h->root.root.string);
2277 /* There's no point in calling bfd_perform_relocation here.
2278 Just go directly to our "special function". */
2279 r = elf_xtensa_do_reloc (howto, input_bfd, input_section,
2280 relocation + rel->r_addend,
2281 contents, rel->r_offset, is_weak_undef,
2284 if (r != bfd_reloc_ok && !warned)
2288 BFD_ASSERT (r == bfd_reloc_dangerous || r == bfd_reloc_other);
2289 BFD_ASSERT (error_message != NULL);
2292 name = h->root.root.string;
2295 name = bfd_elf_string_from_elf_section
2296 (input_bfd, symtab_hdr->sh_link, sym->st_name);
2297 if (name && *name == '\0')
2298 name = bfd_section_name (input_bfd, sec);
2302 if (rel->r_addend == 0)
2303 error_message = vsprint_msg (error_message, ": %s",
2304 strlen (name) + 2, name);
2306 error_message = vsprint_msg (error_message, ": (%s+0x%x)",
2308 name, (int)rel->r_addend);
2311 if (!((*info->callbacks->reloc_dangerous)
2312 (info, error_message, input_bfd, input_section,
2321 input_section->reloc_done = TRUE;
2327 /* Finish up dynamic symbol handling. There's not much to do here since
2328 the PLT and GOT entries are all set up by relocate_section. */
2331 elf_xtensa_finish_dynamic_symbol (bfd *output_bfd ATTRIBUTE_UNUSED,
2332 struct bfd_link_info *info ATTRIBUTE_UNUSED,
2333 struct elf_link_hash_entry *h,
2334 Elf_Internal_Sym *sym)
2336 if (h->needs_plt && !h->def_regular)
2338 /* Mark the symbol as undefined, rather than as defined in
2339 the .plt section. Leave the value alone. */
2340 sym->st_shndx = SHN_UNDEF;
2341 /* If the symbol is weak, we do need to clear the value.
2342 Otherwise, the PLT entry would provide a definition for
2343 the symbol even if the symbol wasn't defined anywhere,
2344 and so the symbol would never be NULL. */
2345 if (!h->ref_regular_nonweak)
2349 /* Mark _DYNAMIC and _GLOBAL_OFFSET_TABLE_ as absolute. */
2350 if (strcmp (h->root.root.string, "_DYNAMIC") == 0
2351 || h == elf_hash_table (info)->hgot)
2352 sym->st_shndx = SHN_ABS;
2358 /* Combine adjacent literal table entries in the output. Adjacent
2359 entries within each input section may have been removed during
2360 relaxation, but we repeat the process here, even though it's too late
2361 to shrink the output section, because it's important to minimize the
2362 number of literal table entries to reduce the start-up work for the
2363 runtime linker. Returns the number of remaining table entries or -1
2367 elf_xtensa_combine_prop_entries (bfd *output_bfd,
2372 property_table_entry *table;
2373 bfd_size_type section_size, sgotloc_size;
2377 section_size = sxtlit->size;
2378 BFD_ASSERT (section_size % 8 == 0);
2379 num = section_size / 8;
2381 sgotloc_size = sgotloc->size;
2382 if (sgotloc_size != section_size)
2384 (*_bfd_error_handler)
2385 (_("internal inconsistency in size of .got.loc section"));
2389 table = bfd_malloc (num * sizeof (property_table_entry));
2393 /* The ".xt.lit.plt" section has the SEC_IN_MEMORY flag set and this
2394 propagates to the output section, where it doesn't really apply and
2395 where it breaks the following call to bfd_malloc_and_get_section. */
2396 sxtlit->flags &= ~SEC_IN_MEMORY;
2398 if (!bfd_malloc_and_get_section (output_bfd, sxtlit, &contents))
2406 /* There should never be any relocations left at this point, so this
2407 is quite a bit easier than what is done during relaxation. */
2409 /* Copy the raw contents into a property table array and sort it. */
2411 for (n = 0; n < num; n++)
2413 table[n].address = bfd_get_32 (output_bfd, &contents[offset]);
2414 table[n].size = bfd_get_32 (output_bfd, &contents[offset + 4]);
2417 qsort (table, num, sizeof (property_table_entry), property_table_compare);
2419 for (n = 0; n < num; n++)
2421 bfd_boolean remove = FALSE;
2423 if (table[n].size == 0)
2426 (table[n-1].address + table[n-1].size == table[n].address))
2428 table[n-1].size += table[n].size;
2434 for (m = n; m < num - 1; m++)
2436 table[m].address = table[m+1].address;
2437 table[m].size = table[m+1].size;
2445 /* Copy the data back to the raw contents. */
2447 for (n = 0; n < num; n++)
2449 bfd_put_32 (output_bfd, table[n].address, &contents[offset]);
2450 bfd_put_32 (output_bfd, table[n].size, &contents[offset + 4]);
2454 /* Clear the removed bytes. */
2455 if ((bfd_size_type) (num * 8) < section_size)
2456 memset (&contents[num * 8], 0, section_size - num * 8);
2458 if (! bfd_set_section_contents (output_bfd, sxtlit, contents, 0,
2462 /* Copy the contents to ".got.loc". */
2463 memcpy (sgotloc->contents, contents, section_size);
2471 /* Finish up the dynamic sections. */
2474 elf_xtensa_finish_dynamic_sections (bfd *output_bfd,
2475 struct bfd_link_info *info)
2477 struct elf_xtensa_link_hash_table *htab;
2479 asection *sdyn, *srelplt, *sgot, *sxtlit, *sgotloc;
2480 Elf32_External_Dyn *dyncon, *dynconend;
2481 int num_xtlit_entries = 0;
2483 if (! elf_hash_table (info)->dynamic_sections_created)
2486 htab = elf_xtensa_hash_table (info);
2487 dynobj = elf_hash_table (info)->dynobj;
2488 sdyn = bfd_get_section_by_name (dynobj, ".dynamic");
2489 BFD_ASSERT (sdyn != NULL);
2491 /* Set the first entry in the global offset table to the address of
2492 the dynamic section. */
2496 BFD_ASSERT (sgot->size == 4);
2498 bfd_put_32 (output_bfd, 0, sgot->contents);
2500 bfd_put_32 (output_bfd,
2501 sdyn->output_section->vma + sdyn->output_offset,
2505 srelplt = htab->srelplt;
2506 if (srelplt && srelplt->size != 0)
2508 asection *sgotplt, *srelgot, *spltlittbl;
2509 int chunk, plt_chunks, plt_entries;
2510 Elf_Internal_Rela irela;
2512 unsigned rtld_reloc;
2514 srelgot = htab->srelgot;
2515 spltlittbl = htab->spltlittbl;
2516 BFD_ASSERT (srelgot != NULL && spltlittbl != NULL);
2518 /* Find the first XTENSA_RTLD relocation. Presumably the rest
2519 of them follow immediately after.... */
2520 for (rtld_reloc = 0; rtld_reloc < srelgot->reloc_count; rtld_reloc++)
2522 loc = srelgot->contents + rtld_reloc * sizeof (Elf32_External_Rela);
2523 bfd_elf32_swap_reloca_in (output_bfd, loc, &irela);
2524 if (ELF32_R_TYPE (irela.r_info) == R_XTENSA_RTLD)
2527 BFD_ASSERT (rtld_reloc < srelgot->reloc_count);
2529 plt_entries = srelplt->size / sizeof (Elf32_External_Rela);
2531 (plt_entries + PLT_ENTRIES_PER_CHUNK - 1) / PLT_ENTRIES_PER_CHUNK;
2533 for (chunk = 0; chunk < plt_chunks; chunk++)
2535 int chunk_entries = 0;
2537 sgotplt = elf_xtensa_get_gotplt_section (info, chunk);
2538 BFD_ASSERT (sgotplt != NULL);
2540 /* Emit special RTLD relocations for the first two entries in
2541 each chunk of the .got.plt section. */
2543 loc = srelgot->contents + rtld_reloc * sizeof (Elf32_External_Rela);
2544 bfd_elf32_swap_reloca_in (output_bfd, loc, &irela);
2545 BFD_ASSERT (ELF32_R_TYPE (irela.r_info) == R_XTENSA_RTLD);
2546 irela.r_offset = (sgotplt->output_section->vma
2547 + sgotplt->output_offset);
2548 irela.r_addend = 1; /* tell rtld to set value to resolver function */
2549 bfd_elf32_swap_reloca_out (output_bfd, &irela, loc);
2551 BFD_ASSERT (rtld_reloc <= srelgot->reloc_count);
2553 /* Next literal immediately follows the first. */
2554 loc += sizeof (Elf32_External_Rela);
2555 bfd_elf32_swap_reloca_in (output_bfd, loc, &irela);
2556 BFD_ASSERT (ELF32_R_TYPE (irela.r_info) == R_XTENSA_RTLD);
2557 irela.r_offset = (sgotplt->output_section->vma
2558 + sgotplt->output_offset + 4);
2559 /* Tell rtld to set value to object's link map. */
2561 bfd_elf32_swap_reloca_out (output_bfd, &irela, loc);
2563 BFD_ASSERT (rtld_reloc <= srelgot->reloc_count);
2565 /* Fill in the literal table. */
2566 if (chunk < plt_chunks - 1)
2567 chunk_entries = PLT_ENTRIES_PER_CHUNK;
2569 chunk_entries = plt_entries - (chunk * PLT_ENTRIES_PER_CHUNK);
2571 BFD_ASSERT ((unsigned) (chunk + 1) * 8 <= spltlittbl->size);
2572 bfd_put_32 (output_bfd,
2573 sgotplt->output_section->vma + sgotplt->output_offset,
2574 spltlittbl->contents + (chunk * 8) + 0);
2575 bfd_put_32 (output_bfd,
2576 8 + (chunk_entries * 4),
2577 spltlittbl->contents + (chunk * 8) + 4);
2580 /* All the dynamic relocations have been emitted at this point.
2581 Make sure the relocation sections are the correct size. */
2582 if (srelgot->size != (sizeof (Elf32_External_Rela)
2583 * srelgot->reloc_count)
2584 || srelplt->size != (sizeof (Elf32_External_Rela)
2585 * srelplt->reloc_count))
2588 /* The .xt.lit.plt section has just been modified. This must
2589 happen before the code below which combines adjacent literal
2590 table entries, and the .xt.lit.plt contents have to be forced to
2592 if (! bfd_set_section_contents (output_bfd,
2593 spltlittbl->output_section,
2594 spltlittbl->contents,
2595 spltlittbl->output_offset,
2598 /* Clear SEC_HAS_CONTENTS so the contents won't be output again. */
2599 spltlittbl->flags &= ~SEC_HAS_CONTENTS;
2602 /* Combine adjacent literal table entries. */
2603 BFD_ASSERT (! info->relocatable);
2604 sxtlit = bfd_get_section_by_name (output_bfd, ".xt.lit");
2605 sgotloc = htab->sgotloc;
2606 BFD_ASSERT (sgotloc);
2610 elf_xtensa_combine_prop_entries (output_bfd, sxtlit, sgotloc);
2611 if (num_xtlit_entries < 0)
2615 dyncon = (Elf32_External_Dyn *) sdyn->contents;
2616 dynconend = (Elf32_External_Dyn *) (sdyn->contents + sdyn->size);
2617 for (; dyncon < dynconend; dyncon++)
2619 Elf_Internal_Dyn dyn;
2621 bfd_elf32_swap_dyn_in (dynobj, dyncon, &dyn);
2628 case DT_XTENSA_GOT_LOC_SZ:
2629 dyn.d_un.d_val = num_xtlit_entries;
2632 case DT_XTENSA_GOT_LOC_OFF:
2633 dyn.d_un.d_ptr = htab->sgotloc->output_section->vma;
2637 dyn.d_un.d_ptr = htab->sgot->output_section->vma;
2641 dyn.d_un.d_ptr = htab->srelplt->output_section->vma;
2645 dyn.d_un.d_val = htab->srelplt->output_section->size;
2649 /* Adjust RELASZ to not include JMPREL. This matches what
2650 glibc expects and what is done for several other ELF
2651 targets (e.g., i386, alpha), but the "correct" behavior
2652 seems to be unresolved. Since the linker script arranges
2653 for .rela.plt to follow all other relocation sections, we
2654 don't have to worry about changing the DT_RELA entry. */
2656 dyn.d_un.d_val -= htab->srelplt->output_section->size;
2660 bfd_elf32_swap_dyn_out (output_bfd, &dyn, dyncon);
2667 /* Functions for dealing with the e_flags field. */
2669 /* Merge backend specific data from an object file to the output
2670 object file when linking. */
2673 elf_xtensa_merge_private_bfd_data (bfd *ibfd, bfd *obfd)
2675 unsigned out_mach, in_mach;
2676 flagword out_flag, in_flag;
2678 /* Check if we have the same endianess. */
2679 if (!_bfd_generic_verify_endian_match (ibfd, obfd))
2682 /* Don't even pretend to support mixed-format linking. */
2683 if (bfd_get_flavour (ibfd) != bfd_target_elf_flavour
2684 || bfd_get_flavour (obfd) != bfd_target_elf_flavour)
2687 out_flag = elf_elfheader (obfd)->e_flags;
2688 in_flag = elf_elfheader (ibfd)->e_flags;
2690 out_mach = out_flag & EF_XTENSA_MACH;
2691 in_mach = in_flag & EF_XTENSA_MACH;
2692 if (out_mach != in_mach)
2694 (*_bfd_error_handler)
2695 (_("%B: incompatible machine type. Output is 0x%x. Input is 0x%x"),
2696 ibfd, out_mach, in_mach);
2697 bfd_set_error (bfd_error_wrong_format);
2701 if (! elf_flags_init (obfd))
2703 elf_flags_init (obfd) = TRUE;
2704 elf_elfheader (obfd)->e_flags = in_flag;
2706 if (bfd_get_arch (obfd) == bfd_get_arch (ibfd)
2707 && bfd_get_arch_info (obfd)->the_default)
2708 return bfd_set_arch_mach (obfd, bfd_get_arch (ibfd),
2709 bfd_get_mach (ibfd));
2714 if ((out_flag & EF_XTENSA_XT_INSN) != (in_flag & EF_XTENSA_XT_INSN))
2715 elf_elfheader (obfd)->e_flags &= (~ EF_XTENSA_XT_INSN);
2717 if ((out_flag & EF_XTENSA_XT_LIT) != (in_flag & EF_XTENSA_XT_LIT))
2718 elf_elfheader (obfd)->e_flags &= (~ EF_XTENSA_XT_LIT);
2725 elf_xtensa_set_private_flags (bfd *abfd, flagword flags)
2727 BFD_ASSERT (!elf_flags_init (abfd)
2728 || elf_elfheader (abfd)->e_flags == flags);
2730 elf_elfheader (abfd)->e_flags |= flags;
2731 elf_flags_init (abfd) = TRUE;
2738 elf_xtensa_print_private_bfd_data (bfd *abfd, void *farg)
2740 FILE *f = (FILE *) farg;
2741 flagword e_flags = elf_elfheader (abfd)->e_flags;
2743 fprintf (f, "\nXtensa header:\n");
2744 if ((e_flags & EF_XTENSA_MACH) == E_XTENSA_MACH)
2745 fprintf (f, "\nMachine = Base\n");
2747 fprintf (f, "\nMachine Id = 0x%x\n", e_flags & EF_XTENSA_MACH);
2749 fprintf (f, "Insn tables = %s\n",
2750 (e_flags & EF_XTENSA_XT_INSN) ? "true" : "false");
2752 fprintf (f, "Literal tables = %s\n",
2753 (e_flags & EF_XTENSA_XT_LIT) ? "true" : "false");
2755 return _bfd_elf_print_private_bfd_data (abfd, farg);
2759 /* Set the right machine number for an Xtensa ELF file. */
2762 elf_xtensa_object_p (bfd *abfd)
2765 unsigned long arch = elf_elfheader (abfd)->e_flags & EF_XTENSA_MACH;
2770 mach = bfd_mach_xtensa;
2776 (void) bfd_default_set_arch_mach (abfd, bfd_arch_xtensa, mach);
2781 /* The final processing done just before writing out an Xtensa ELF object
2782 file. This gets the Xtensa architecture right based on the machine
2786 elf_xtensa_final_write_processing (bfd *abfd,
2787 bfd_boolean linker ATTRIBUTE_UNUSED)
2792 switch (mach = bfd_get_mach (abfd))
2794 case bfd_mach_xtensa:
2795 val = E_XTENSA_MACH;
2801 elf_elfheader (abfd)->e_flags &= (~ EF_XTENSA_MACH);
2802 elf_elfheader (abfd)->e_flags |= val;
2806 static enum elf_reloc_type_class
2807 elf_xtensa_reloc_type_class (const Elf_Internal_Rela *rela)
2809 switch ((int) ELF32_R_TYPE (rela->r_info))
2811 case R_XTENSA_RELATIVE:
2812 return reloc_class_relative;
2813 case R_XTENSA_JMP_SLOT:
2814 return reloc_class_plt;
2816 return reloc_class_normal;
2822 elf_xtensa_discard_info_for_section (bfd *abfd,
2823 struct elf_reloc_cookie *cookie,
2824 struct bfd_link_info *info,
2828 bfd_vma offset, actual_offset;
2829 bfd_size_type removed_bytes = 0;
2830 bfd_size_type entry_size;
2832 if (sec->output_section
2833 && bfd_is_abs_section (sec->output_section))
2836 if (xtensa_is_proptable_section (sec))
2841 if (sec->size == 0 || sec->size % entry_size != 0)
2844 contents = retrieve_contents (abfd, sec, info->keep_memory);
2848 cookie->rels = retrieve_internal_relocs (abfd, sec, info->keep_memory);
2851 release_contents (sec, contents);
2855 /* Sort the relocations. They should already be in order when
2856 relaxation is enabled, but it might not be. */
2857 qsort (cookie->rels, sec->reloc_count, sizeof (Elf_Internal_Rela),
2858 internal_reloc_compare);
2860 cookie->rel = cookie->rels;
2861 cookie->relend = cookie->rels + sec->reloc_count;
2863 for (offset = 0; offset < sec->size; offset += entry_size)
2865 actual_offset = offset - removed_bytes;
2867 /* The ...symbol_deleted_p function will skip over relocs but it
2868 won't adjust their offsets, so do that here. */
2869 while (cookie->rel < cookie->relend
2870 && cookie->rel->r_offset < offset)
2872 cookie->rel->r_offset -= removed_bytes;
2876 while (cookie->rel < cookie->relend
2877 && cookie->rel->r_offset == offset)
2879 if (bfd_elf_reloc_symbol_deleted_p (offset, cookie))
2881 /* Remove the table entry. (If the reloc type is NONE, then
2882 the entry has already been merged with another and deleted
2883 during relaxation.) */
2884 if (ELF32_R_TYPE (cookie->rel->r_info) != R_XTENSA_NONE)
2886 /* Shift the contents up. */
2887 if (offset + entry_size < sec->size)
2888 memmove (&contents[actual_offset],
2889 &contents[actual_offset + entry_size],
2890 sec->size - offset - entry_size);
2891 removed_bytes += entry_size;
2894 /* Remove this relocation. */
2895 cookie->rel->r_info = ELF32_R_INFO (0, R_XTENSA_NONE);
2898 /* Adjust the relocation offset for previous removals. This
2899 should not be done before calling ...symbol_deleted_p
2900 because it might mess up the offset comparisons there.
2901 Make sure the offset doesn't underflow in the case where
2902 the first entry is removed. */
2903 if (cookie->rel->r_offset >= removed_bytes)
2904 cookie->rel->r_offset -= removed_bytes;
2906 cookie->rel->r_offset = 0;
2912 if (removed_bytes != 0)
2914 /* Adjust any remaining relocs (shouldn't be any). */
2915 for (; cookie->rel < cookie->relend; cookie->rel++)
2917 if (cookie->rel->r_offset >= removed_bytes)
2918 cookie->rel->r_offset -= removed_bytes;
2920 cookie->rel->r_offset = 0;
2923 /* Clear the removed bytes. */
2924 memset (&contents[sec->size - removed_bytes], 0, removed_bytes);
2926 pin_contents (sec, contents);
2927 pin_internal_relocs (sec, cookie->rels);
2930 if (sec->rawsize == 0)
2931 sec->rawsize = sec->size;
2932 sec->size -= removed_bytes;
2934 if (xtensa_is_littable_section (sec))
2936 asection *sgotloc = elf_xtensa_hash_table (info)->sgotloc;
2938 sgotloc->size -= removed_bytes;
2943 release_contents (sec, contents);
2944 release_internal_relocs (sec, cookie->rels);
2947 return (removed_bytes != 0);
2952 elf_xtensa_discard_info (bfd *abfd,
2953 struct elf_reloc_cookie *cookie,
2954 struct bfd_link_info *info)
2957 bfd_boolean changed = FALSE;
2959 for (sec = abfd->sections; sec != NULL; sec = sec->next)
2961 if (xtensa_is_property_section (sec))
2963 if (elf_xtensa_discard_info_for_section (abfd, cookie, info, sec))
2973 elf_xtensa_ignore_discarded_relocs (asection *sec)
2975 return xtensa_is_property_section (sec);
2980 elf_xtensa_action_discarded (asection *sec)
2982 if (strcmp (".xt_except_table", sec->name) == 0)
2985 if (strcmp (".xt_except_desc", sec->name) == 0)
2988 return _bfd_elf_default_action_discarded (sec);
2992 /* Support for core dump NOTE sections. */
2995 elf_xtensa_grok_prstatus (bfd *abfd, Elf_Internal_Note *note)
3000 /* The size for Xtensa is variable, so don't try to recognize the format
3001 based on the size. Just assume this is GNU/Linux. */
3004 elf_tdata (abfd)->core_signal = bfd_get_16 (abfd, note->descdata + 12);
3007 elf_tdata (abfd)->core_pid = bfd_get_32 (abfd, note->descdata + 24);
3011 size = note->descsz - offset - 4;
3013 /* Make a ".reg/999" section. */
3014 return _bfd_elfcore_make_pseudosection (abfd, ".reg",
3015 size, note->descpos + offset);
3020 elf_xtensa_grok_psinfo (bfd *abfd, Elf_Internal_Note *note)
3022 switch (note->descsz)
3027 case 128: /* GNU/Linux elf_prpsinfo */
3028 elf_tdata (abfd)->core_program
3029 = _bfd_elfcore_strndup (abfd, note->descdata + 32, 16);
3030 elf_tdata (abfd)->core_command
3031 = _bfd_elfcore_strndup (abfd, note->descdata + 48, 80);
3034 /* Note that for some reason, a spurious space is tacked
3035 onto the end of the args in some (at least one anyway)
3036 implementations, so strip it off if it exists. */
3039 char *command = elf_tdata (abfd)->core_command;
3040 int n = strlen (command);
3042 if (0 < n && command[n - 1] == ' ')
3043 command[n - 1] = '\0';
3050 /* Generic Xtensa configurability stuff. */
3052 static xtensa_opcode callx0_op = XTENSA_UNDEFINED;
3053 static xtensa_opcode callx4_op = XTENSA_UNDEFINED;
3054 static xtensa_opcode callx8_op = XTENSA_UNDEFINED;
3055 static xtensa_opcode callx12_op = XTENSA_UNDEFINED;
3056 static xtensa_opcode call0_op = XTENSA_UNDEFINED;
3057 static xtensa_opcode call4_op = XTENSA_UNDEFINED;
3058 static xtensa_opcode call8_op = XTENSA_UNDEFINED;
3059 static xtensa_opcode call12_op = XTENSA_UNDEFINED;
3062 init_call_opcodes (void)
3064 if (callx0_op == XTENSA_UNDEFINED)
3066 callx0_op = xtensa_opcode_lookup (xtensa_default_isa, "callx0");
3067 callx4_op = xtensa_opcode_lookup (xtensa_default_isa, "callx4");
3068 callx8_op = xtensa_opcode_lookup (xtensa_default_isa, "callx8");
3069 callx12_op = xtensa_opcode_lookup (xtensa_default_isa, "callx12");
3070 call0_op = xtensa_opcode_lookup (xtensa_default_isa, "call0");
3071 call4_op = xtensa_opcode_lookup (xtensa_default_isa, "call4");
3072 call8_op = xtensa_opcode_lookup (xtensa_default_isa, "call8");
3073 call12_op = xtensa_opcode_lookup (xtensa_default_isa, "call12");
3079 is_indirect_call_opcode (xtensa_opcode opcode)
3081 init_call_opcodes ();
3082 return (opcode == callx0_op
3083 || opcode == callx4_op
3084 || opcode == callx8_op
3085 || opcode == callx12_op);
3090 is_direct_call_opcode (xtensa_opcode opcode)
3092 init_call_opcodes ();
3093 return (opcode == call0_op
3094 || opcode == call4_op
3095 || opcode == call8_op
3096 || opcode == call12_op);
3101 is_windowed_call_opcode (xtensa_opcode opcode)
3103 init_call_opcodes ();
3104 return (opcode == call4_op
3105 || opcode == call8_op
3106 || opcode == call12_op
3107 || opcode == callx4_op
3108 || opcode == callx8_op
3109 || opcode == callx12_op);
3113 static xtensa_opcode
3114 get_const16_opcode (void)
3116 static bfd_boolean done_lookup = FALSE;
3117 static xtensa_opcode const16_opcode = XTENSA_UNDEFINED;
3120 const16_opcode = xtensa_opcode_lookup (xtensa_default_isa, "const16");
3123 return const16_opcode;
3127 static xtensa_opcode
3128 get_l32r_opcode (void)
3130 static xtensa_opcode l32r_opcode = XTENSA_UNDEFINED;
3131 static bfd_boolean done_lookup = FALSE;
3135 l32r_opcode = xtensa_opcode_lookup (xtensa_default_isa, "l32r");
3143 l32r_offset (bfd_vma addr, bfd_vma pc)
3147 offset = addr - ((pc+3) & -4);
3148 BFD_ASSERT ((offset & ((1 << 2) - 1)) == 0);
3149 offset = (signed int) offset >> 2;
3150 BFD_ASSERT ((signed int) offset >> 16 == -1);
3156 get_relocation_opnd (xtensa_opcode opcode, int r_type)
3158 xtensa_isa isa = xtensa_default_isa;
3159 int last_immed, last_opnd, opi;
3161 if (opcode == XTENSA_UNDEFINED)
3162 return XTENSA_UNDEFINED;
3164 /* Find the last visible PC-relative immediate operand for the opcode.
3165 If there are no PC-relative immediates, then choose the last visible
3166 immediate; otherwise, fail and return XTENSA_UNDEFINED. */
3167 last_immed = XTENSA_UNDEFINED;
3168 last_opnd = xtensa_opcode_num_operands (isa, opcode);
3169 for (opi = last_opnd - 1; opi >= 0; opi--)
3171 if (xtensa_operand_is_visible (isa, opcode, opi) == 0)
3173 if (xtensa_operand_is_PCrelative (isa, opcode, opi) == 1)
3178 if (last_immed == XTENSA_UNDEFINED
3179 && xtensa_operand_is_register (isa, opcode, opi) == 0)
3183 return XTENSA_UNDEFINED;
3185 /* If the operand number was specified in an old-style relocation,
3186 check for consistency with the operand computed above. */
3187 if (r_type >= R_XTENSA_OP0 && r_type <= R_XTENSA_OP2)
3189 int reloc_opnd = r_type - R_XTENSA_OP0;
3190 if (reloc_opnd != last_immed)
3191 return XTENSA_UNDEFINED;
3199 get_relocation_slot (int r_type)
3209 if (r_type >= R_XTENSA_SLOT0_OP && r_type <= R_XTENSA_SLOT14_OP)
3210 return r_type - R_XTENSA_SLOT0_OP;
3211 if (r_type >= R_XTENSA_SLOT0_ALT && r_type <= R_XTENSA_SLOT14_ALT)
3212 return r_type - R_XTENSA_SLOT0_ALT;
3216 return XTENSA_UNDEFINED;
3220 /* Get the opcode for a relocation. */
3222 static xtensa_opcode
3223 get_relocation_opcode (bfd *abfd,
3226 Elf_Internal_Rela *irel)
3228 static xtensa_insnbuf ibuff = NULL;
3229 static xtensa_insnbuf sbuff = NULL;
3230 xtensa_isa isa = xtensa_default_isa;
3234 if (contents == NULL)
3235 return XTENSA_UNDEFINED;
3237 if (bfd_get_section_limit (abfd, sec) <= irel->r_offset)
3238 return XTENSA_UNDEFINED;
3242 ibuff = xtensa_insnbuf_alloc (isa);
3243 sbuff = xtensa_insnbuf_alloc (isa);
3246 /* Decode the instruction. */
3247 xtensa_insnbuf_from_chars (isa, ibuff, &contents[irel->r_offset],
3248 sec->size - irel->r_offset);
3249 fmt = xtensa_format_decode (isa, ibuff);
3250 slot = get_relocation_slot (ELF32_R_TYPE (irel->r_info));
3251 if (slot == XTENSA_UNDEFINED)
3252 return XTENSA_UNDEFINED;
3253 xtensa_format_get_slot (isa, fmt, slot, ibuff, sbuff);
3254 return xtensa_opcode_decode (isa, fmt, slot, sbuff);
3259 is_l32r_relocation (bfd *abfd,
3262 Elf_Internal_Rela *irel)
3264 xtensa_opcode opcode;
3265 if (!is_operand_relocation (ELF32_R_TYPE (irel->r_info)))
3267 opcode = get_relocation_opcode (abfd, sec, contents, irel);
3268 return (opcode == get_l32r_opcode ());
3272 static bfd_size_type
3273 get_asm_simplify_size (bfd_byte *contents,
3274 bfd_size_type content_len,
3275 bfd_size_type offset)
3277 bfd_size_type insnlen, size = 0;
3279 /* Decode the size of the next two instructions. */
3280 insnlen = insn_decode_len (contents, content_len, offset);
3286 insnlen = insn_decode_len (contents, content_len, offset + size);
3296 is_alt_relocation (int r_type)
3298 return (r_type >= R_XTENSA_SLOT0_ALT
3299 && r_type <= R_XTENSA_SLOT14_ALT);
3304 is_operand_relocation (int r_type)
3314 if (r_type >= R_XTENSA_SLOT0_OP && r_type <= R_XTENSA_SLOT14_OP)
3316 if (r_type >= R_XTENSA_SLOT0_ALT && r_type <= R_XTENSA_SLOT14_ALT)
3325 #define MIN_INSN_LENGTH 2
3327 /* Return 0 if it fails to decode. */
3330 insn_decode_len (bfd_byte *contents,
3331 bfd_size_type content_len,
3332 bfd_size_type offset)
3335 xtensa_isa isa = xtensa_default_isa;
3337 static xtensa_insnbuf ibuff = NULL;
3339 if (offset + MIN_INSN_LENGTH > content_len)
3343 ibuff = xtensa_insnbuf_alloc (isa);
3344 xtensa_insnbuf_from_chars (isa, ibuff, &contents[offset],
3345 content_len - offset);
3346 fmt = xtensa_format_decode (isa, ibuff);
3347 if (fmt == XTENSA_UNDEFINED)
3349 insn_len = xtensa_format_length (isa, fmt);
3350 if (insn_len == XTENSA_UNDEFINED)
3356 /* Decode the opcode for a single slot instruction.
3357 Return 0 if it fails to decode or the instruction is multi-slot. */
3360 insn_decode_opcode (bfd_byte *contents,
3361 bfd_size_type content_len,
3362 bfd_size_type offset,
3365 xtensa_isa isa = xtensa_default_isa;
3367 static xtensa_insnbuf insnbuf = NULL;
3368 static xtensa_insnbuf slotbuf = NULL;
3370 if (offset + MIN_INSN_LENGTH > content_len)
3371 return XTENSA_UNDEFINED;
3373 if (insnbuf == NULL)
3375 insnbuf = xtensa_insnbuf_alloc (isa);
3376 slotbuf = xtensa_insnbuf_alloc (isa);
3379 xtensa_insnbuf_from_chars (isa, insnbuf, &contents[offset],
3380 content_len - offset);
3381 fmt = xtensa_format_decode (isa, insnbuf);
3382 if (fmt == XTENSA_UNDEFINED)
3383 return XTENSA_UNDEFINED;
3385 if (slot >= xtensa_format_num_slots (isa, fmt))
3386 return XTENSA_UNDEFINED;
3388 xtensa_format_get_slot (isa, fmt, slot, insnbuf, slotbuf);
3389 return xtensa_opcode_decode (isa, fmt, slot, slotbuf);
3393 /* The offset is the offset in the contents.
3394 The address is the address of that offset. */
3397 check_branch_target_aligned (bfd_byte *contents,
3398 bfd_size_type content_length,
3402 bfd_size_type insn_len = insn_decode_len (contents, content_length, offset);
3405 return check_branch_target_aligned_address (address, insn_len);
3410 check_loop_aligned (bfd_byte *contents,
3411 bfd_size_type content_length,
3415 bfd_size_type loop_len, insn_len;
3416 xtensa_opcode opcode;
3418 opcode = insn_decode_opcode (contents, content_length, offset, 0);
3419 if (opcode == XTENSA_UNDEFINED
3420 || xtensa_opcode_is_loop (xtensa_default_isa, opcode) != 1)
3426 loop_len = insn_decode_len (contents, content_length, offset);
3427 insn_len = insn_decode_len (contents, content_length, offset + loop_len);
3428 if (loop_len == 0 || insn_len == 0)
3434 return check_branch_target_aligned_address (address + loop_len, insn_len);
3439 check_branch_target_aligned_address (bfd_vma addr, int len)
3442 return (addr % 8 == 0);
3443 return ((addr >> 2) == ((addr + len - 1) >> 2));
3447 /* Instruction widening and narrowing. */
3449 /* When FLIX is available we need to access certain instructions only
3450 when they are 16-bit or 24-bit instructions. This table caches
3451 information about such instructions by walking through all the
3452 opcodes and finding the smallest single-slot format into which each
3455 static xtensa_format *op_single_fmt_table = NULL;
3459 init_op_single_format_table (void)
3461 xtensa_isa isa = xtensa_default_isa;
3462 xtensa_insnbuf ibuf;
3463 xtensa_opcode opcode;
3467 if (op_single_fmt_table)
3470 ibuf = xtensa_insnbuf_alloc (isa);
3471 num_opcodes = xtensa_isa_num_opcodes (isa);
3473 op_single_fmt_table = (xtensa_format *)
3474 bfd_malloc (sizeof (xtensa_format) * num_opcodes);
3475 for (opcode = 0; opcode < num_opcodes; opcode++)
3477 op_single_fmt_table[opcode] = XTENSA_UNDEFINED;
3478 for (fmt = 0; fmt < xtensa_isa_num_formats (isa); fmt++)
3480 if (xtensa_format_num_slots (isa, fmt) == 1
3481 && xtensa_opcode_encode (isa, fmt, 0, ibuf, opcode) == 0)
3483 xtensa_opcode old_fmt = op_single_fmt_table[opcode];
3484 int fmt_length = xtensa_format_length (isa, fmt);
3485 if (old_fmt == XTENSA_UNDEFINED
3486 || fmt_length < xtensa_format_length (isa, old_fmt))
3487 op_single_fmt_table[opcode] = fmt;
3491 xtensa_insnbuf_free (isa, ibuf);
3495 static xtensa_format
3496 get_single_format (xtensa_opcode opcode)
3498 init_op_single_format_table ();
3499 return op_single_fmt_table[opcode];
3503 /* For the set of narrowable instructions we do NOT include the
3504 narrowings beqz -> beqz.n or bnez -> bnez.n because of complexities
3505 involved during linker relaxation that may require these to
3506 re-expand in some conditions. Also, the narrowing "or" -> mov.n
3507 requires special case code to ensure it only works when op1 == op2. */
3515 struct string_pair narrowable[] =
3518 { "addi", "addi.n" },
3519 { "addmi", "addi.n" },
3520 { "l32i", "l32i.n" },
3521 { "movi", "movi.n" },
3523 { "retw", "retw.n" },
3524 { "s32i", "s32i.n" },
3525 { "or", "mov.n" } /* special case only when op1 == op2 */
3528 struct string_pair widenable[] =
3531 { "addi", "addi.n" },
3532 { "addmi", "addi.n" },
3533 { "beqz", "beqz.n" },
3534 { "bnez", "bnez.n" },
3535 { "l32i", "l32i.n" },
3536 { "movi", "movi.n" },
3538 { "retw", "retw.n" },
3539 { "s32i", "s32i.n" },
3540 { "or", "mov.n" } /* special case only when op1 == op2 */
3544 /* Check if an instruction can be "narrowed", i.e., changed from a standard
3545 3-byte instruction to a 2-byte "density" instruction. If it is valid,
3546 return the instruction buffer holding the narrow instruction. Otherwise,
3547 return 0. The set of valid narrowing are specified by a string table
3548 but require some special case operand checks in some cases. */
3550 static xtensa_insnbuf
3551 can_narrow_instruction (xtensa_insnbuf slotbuf,
3553 xtensa_opcode opcode)
3555 xtensa_isa isa = xtensa_default_isa;
3556 xtensa_format o_fmt;
3559 static xtensa_insnbuf o_insnbuf = NULL;
3560 static xtensa_insnbuf o_slotbuf = NULL;
3562 if (o_insnbuf == NULL)
3564 o_insnbuf = xtensa_insnbuf_alloc (isa);
3565 o_slotbuf = xtensa_insnbuf_alloc (isa);
3568 for (opi = 0; opi < (sizeof (narrowable)/sizeof (struct string_pair)); opi++)
3570 bfd_boolean is_or = (strcmp ("or", narrowable[opi].wide) == 0);
3572 if (opcode == xtensa_opcode_lookup (isa, narrowable[opi].wide))
3574 uint32 value, newval;
3575 int i, operand_count, o_operand_count;
3576 xtensa_opcode o_opcode;
3578 /* Address does not matter in this case. We might need to
3579 fix it to handle branches/jumps. */
3580 bfd_vma self_address = 0;
3582 o_opcode = xtensa_opcode_lookup (isa, narrowable[opi].narrow);
3583 if (o_opcode == XTENSA_UNDEFINED)
3585 o_fmt = get_single_format (o_opcode);
3586 if (o_fmt == XTENSA_UNDEFINED)
3589 if (xtensa_format_length (isa, fmt) != 3
3590 || xtensa_format_length (isa, o_fmt) != 2)
3593 xtensa_format_encode (isa, o_fmt, o_insnbuf);
3594 operand_count = xtensa_opcode_num_operands (isa, opcode);
3595 o_operand_count = xtensa_opcode_num_operands (isa, o_opcode);
3597 if (xtensa_opcode_encode (isa, o_fmt, 0, o_slotbuf, o_opcode) != 0)
3602 if (xtensa_opcode_num_operands (isa, o_opcode) != operand_count)
3607 uint32 rawval0, rawval1, rawval2;
3609 if (o_operand_count + 1 != operand_count
3610 || xtensa_operand_get_field (isa, opcode, 0,
3611 fmt, 0, slotbuf, &rawval0) != 0
3612 || xtensa_operand_get_field (isa, opcode, 1,
3613 fmt, 0, slotbuf, &rawval1) != 0
3614 || xtensa_operand_get_field (isa, opcode, 2,
3615 fmt, 0, slotbuf, &rawval2) != 0
3616 || rawval1 != rawval2
3617 || rawval0 == rawval1 /* it is a nop */)
3621 for (i = 0; i < o_operand_count; ++i)
3623 if (xtensa_operand_get_field (isa, opcode, i, fmt, 0,
3625 || xtensa_operand_decode (isa, opcode, i, &value))
3628 /* PC-relative branches need adjustment, but
3629 the PC-rel operand will always have a relocation. */
3631 if (xtensa_operand_do_reloc (isa, o_opcode, i, &newval,
3633 || xtensa_operand_encode (isa, o_opcode, i, &newval)
3634 || xtensa_operand_set_field (isa, o_opcode, i, o_fmt, 0,
3639 if (xtensa_format_set_slot (isa, o_fmt, 0, o_insnbuf, o_slotbuf))
3649 /* Attempt to narrow an instruction. If the narrowing is valid, perform
3650 the action in-place directly into the contents and return TRUE. Otherwise,
3651 the return value is FALSE and the contents are not modified. */
3654 narrow_instruction (bfd_byte *contents,
3655 bfd_size_type content_length,
3656 bfd_size_type offset)
3658 xtensa_opcode opcode;
3659 bfd_size_type insn_len;
3660 xtensa_isa isa = xtensa_default_isa;
3662 xtensa_insnbuf o_insnbuf;
3664 static xtensa_insnbuf insnbuf = NULL;
3665 static xtensa_insnbuf slotbuf = NULL;
3667 if (insnbuf == NULL)
3669 insnbuf = xtensa_insnbuf_alloc (isa);
3670 slotbuf = xtensa_insnbuf_alloc (isa);
3673 BFD_ASSERT (offset < content_length);
3675 if (content_length < 2)
3678 /* We will hand-code a few of these for a little while.
3679 These have all been specified in the assembler aleady. */
3680 xtensa_insnbuf_from_chars (isa, insnbuf, &contents[offset],
3681 content_length - offset);
3682 fmt = xtensa_format_decode (isa, insnbuf);
3683 if (xtensa_format_num_slots (isa, fmt) != 1)
3686 if (xtensa_format_get_slot (isa, fmt, 0, insnbuf, slotbuf) != 0)
3689 opcode = xtensa_opcode_decode (isa, fmt, 0, slotbuf);
3690 if (opcode == XTENSA_UNDEFINED)
3692 insn_len = xtensa_format_length (isa, fmt);
3693 if (insn_len > content_length)
3696 o_insnbuf = can_narrow_instruction (slotbuf, fmt, opcode);
3699 xtensa_insnbuf_to_chars (isa, o_insnbuf, contents + offset,
3700 content_length - offset);
3708 /* Check if an instruction can be "widened", i.e., changed from a 2-byte
3709 "density" instruction to a standard 3-byte instruction. If it is valid,
3710 return the instruction buffer holding the wide instruction. Otherwise,
3711 return 0. The set of valid widenings are specified by a string table
3712 but require some special case operand checks in some cases. */
3714 static xtensa_insnbuf
3715 can_widen_instruction (xtensa_insnbuf slotbuf,
3717 xtensa_opcode opcode)
3719 xtensa_isa isa = xtensa_default_isa;
3720 xtensa_format o_fmt;
3723 static xtensa_insnbuf o_insnbuf = NULL;
3724 static xtensa_insnbuf o_slotbuf = NULL;
3726 if (o_insnbuf == NULL)
3728 o_insnbuf = xtensa_insnbuf_alloc (isa);
3729 o_slotbuf = xtensa_insnbuf_alloc (isa);
3732 for (opi = 0; opi < (sizeof (widenable)/sizeof (struct string_pair)); opi++)
3734 bfd_boolean is_or = (strcmp ("or", widenable[opi].wide) == 0);
3735 bfd_boolean is_branch = (strcmp ("beqz", widenable[opi].wide) == 0
3736 || strcmp ("bnez", widenable[opi].wide) == 0);
3738 if (opcode == xtensa_opcode_lookup (isa, widenable[opi].narrow))
3740 uint32 value, newval;
3741 int i, operand_count, o_operand_count, check_operand_count;
3742 xtensa_opcode o_opcode;
3744 /* Address does not matter in this case. We might need to fix it
3745 to handle branches/jumps. */
3746 bfd_vma self_address = 0;
3748 o_opcode = xtensa_opcode_lookup (isa, widenable[opi].wide);
3749 if (o_opcode == XTENSA_UNDEFINED)
3751 o_fmt = get_single_format (o_opcode);
3752 if (o_fmt == XTENSA_UNDEFINED)
3755 if (xtensa_format_length (isa, fmt) != 2
3756 || xtensa_format_length (isa, o_fmt) != 3)
3759 xtensa_format_encode (isa, o_fmt, o_insnbuf);
3760 operand_count = xtensa_opcode_num_operands (isa, opcode);
3761 o_operand_count = xtensa_opcode_num_operands (isa, o_opcode);
3762 check_operand_count = o_operand_count;
3764 if (xtensa_opcode_encode (isa, o_fmt, 0, o_slotbuf, o_opcode) != 0)
3769 if (xtensa_opcode_num_operands (isa, o_opcode) != operand_count)
3774 uint32 rawval0, rawval1;
3776 if (o_operand_count != operand_count + 1
3777 || xtensa_operand_get_field (isa, opcode, 0,
3778 fmt, 0, slotbuf, &rawval0) != 0
3779 || xtensa_operand_get_field (isa, opcode, 1,
3780 fmt, 0, slotbuf, &rawval1) != 0
3781 || rawval0 == rawval1 /* it is a nop */)
3785 check_operand_count--;
3787 for (i = 0; i < check_operand_count; i++)
3790 if (is_or && i == o_operand_count - 1)
3792 if (xtensa_operand_get_field (isa, opcode, new_i, fmt, 0,
3794 || xtensa_operand_decode (isa, opcode, new_i, &value))
3797 /* PC-relative branches need adjustment, but
3798 the PC-rel operand will always have a relocation. */
3800 if (xtensa_operand_do_reloc (isa, o_opcode, i, &newval,
3802 || xtensa_operand_encode (isa, o_opcode, i, &newval)
3803 || xtensa_operand_set_field (isa, o_opcode, i, o_fmt, 0,
3808 if (xtensa_format_set_slot (isa, o_fmt, 0, o_insnbuf, o_slotbuf))
3818 /* Attempt to widen an instruction. If the widening is valid, perform
3819 the action in-place directly into the contents and return TRUE. Otherwise,
3820 the return value is FALSE and the contents are not modified. */
3823 widen_instruction (bfd_byte *contents,
3824 bfd_size_type content_length,
3825 bfd_size_type offset)
3827 xtensa_opcode opcode;
3828 bfd_size_type insn_len;
3829 xtensa_isa isa = xtensa_default_isa;
3831 xtensa_insnbuf o_insnbuf;
3833 static xtensa_insnbuf insnbuf = NULL;
3834 static xtensa_insnbuf slotbuf = NULL;
3836 if (insnbuf == NULL)
3838 insnbuf = xtensa_insnbuf_alloc (isa);
3839 slotbuf = xtensa_insnbuf_alloc (isa);
3842 BFD_ASSERT (offset < content_length);
3844 if (content_length < 2)
3847 /* We will hand-code a few of these for a little while.
3848 These have all been specified in the assembler aleady. */
3849 xtensa_insnbuf_from_chars (isa, insnbuf, &contents[offset],
3850 content_length - offset);
3851 fmt = xtensa_format_decode (isa, insnbuf);
3852 if (xtensa_format_num_slots (isa, fmt) != 1)
3855 if (xtensa_format_get_slot (isa, fmt, 0, insnbuf, slotbuf) != 0)
3858 opcode = xtensa_opcode_decode (isa, fmt, 0, slotbuf);
3859 if (opcode == XTENSA_UNDEFINED)
3861 insn_len = xtensa_format_length (isa, fmt);
3862 if (insn_len > content_length)
3865 o_insnbuf = can_widen_instruction (slotbuf, fmt, opcode);
3868 xtensa_insnbuf_to_chars (isa, o_insnbuf, contents + offset,
3869 content_length - offset);
3876 /* Code for transforming CALLs at link-time. */
3878 static bfd_reloc_status_type
3879 elf_xtensa_do_asm_simplify (bfd_byte *contents,
3881 bfd_vma content_length,
3882 char **error_message)
3884 static xtensa_insnbuf insnbuf = NULL;
3885 static xtensa_insnbuf slotbuf = NULL;
3886 xtensa_format core_format = XTENSA_UNDEFINED;
3887 xtensa_opcode opcode;
3888 xtensa_opcode direct_call_opcode;
3889 xtensa_isa isa = xtensa_default_isa;
3890 bfd_byte *chbuf = contents + address;
3893 if (insnbuf == NULL)
3895 insnbuf = xtensa_insnbuf_alloc (isa);
3896 slotbuf = xtensa_insnbuf_alloc (isa);
3899 if (content_length < address)
3901 *error_message = _("Attempt to convert L32R/CALLX to CALL failed");
3902 return bfd_reloc_other;
3905 opcode = get_expanded_call_opcode (chbuf, content_length - address, 0);
3906 direct_call_opcode = swap_callx_for_call_opcode (opcode);
3907 if (direct_call_opcode == XTENSA_UNDEFINED)
3909 *error_message = _("Attempt to convert L32R/CALLX to CALL failed");
3910 return bfd_reloc_other;
3913 /* Assemble a NOP ("or a1, a1, a1") into the 0 byte offset. */
3914 core_format = xtensa_format_lookup (isa, "x24");
3915 opcode = xtensa_opcode_lookup (isa, "or");
3916 xtensa_opcode_encode (isa, core_format, 0, slotbuf, opcode);
3917 for (opn = 0; opn < 3; opn++)
3920 xtensa_operand_encode (isa, opcode, opn, ®no);
3921 xtensa_operand_set_field (isa, opcode, opn, core_format, 0,
3924 xtensa_format_encode (isa, core_format, insnbuf);
3925 xtensa_format_set_slot (isa, core_format, 0, insnbuf, slotbuf);
3926 xtensa_insnbuf_to_chars (isa, insnbuf, chbuf, content_length - address);
3928 /* Assemble a CALL ("callN 0") into the 3 byte offset. */
3929 xtensa_opcode_encode (isa, core_format, 0, slotbuf, direct_call_opcode);
3930 xtensa_operand_set_field (isa, opcode, 0, core_format, 0, slotbuf, 0);
3932 xtensa_format_encode (isa, core_format, insnbuf);
3933 xtensa_format_set_slot (isa, core_format, 0, insnbuf, slotbuf);
3934 xtensa_insnbuf_to_chars (isa, insnbuf, chbuf + 3,
3935 content_length - address - 3);
3937 return bfd_reloc_ok;
3941 static bfd_reloc_status_type
3942 contract_asm_expansion (bfd_byte *contents,
3943 bfd_vma content_length,
3944 Elf_Internal_Rela *irel,
3945 char **error_message)
3947 bfd_reloc_status_type retval =
3948 elf_xtensa_do_asm_simplify (contents, irel->r_offset, content_length,
3951 if (retval != bfd_reloc_ok)
3952 return bfd_reloc_dangerous;
3954 /* Update the irel->r_offset field so that the right immediate and
3955 the right instruction are modified during the relocation. */
3956 irel->r_offset += 3;
3957 irel->r_info = ELF32_R_INFO (ELF32_R_SYM (irel->r_info), R_XTENSA_SLOT0_OP);
3958 return bfd_reloc_ok;
3962 static xtensa_opcode
3963 swap_callx_for_call_opcode (xtensa_opcode opcode)
3965 init_call_opcodes ();
3967 if (opcode == callx0_op) return call0_op;
3968 if (opcode == callx4_op) return call4_op;
3969 if (opcode == callx8_op) return call8_op;
3970 if (opcode == callx12_op) return call12_op;
3972 /* Return XTENSA_UNDEFINED if the opcode is not an indirect call. */
3973 return XTENSA_UNDEFINED;
3977 /* Check if "buf" is pointing to a "L32R aN; CALLX aN" or "CONST16 aN;
3978 CONST16 aN; CALLX aN" sequence, and if so, return the CALLX opcode.
3979 If not, return XTENSA_UNDEFINED. */
3981 #define L32R_TARGET_REG_OPERAND 0
3982 #define CONST16_TARGET_REG_OPERAND 0
3983 #define CALLN_SOURCE_OPERAND 0
3985 static xtensa_opcode
3986 get_expanded_call_opcode (bfd_byte *buf, int bufsize, bfd_boolean *p_uses_l32r)
3988 static xtensa_insnbuf insnbuf = NULL;
3989 static xtensa_insnbuf slotbuf = NULL;
3991 xtensa_opcode opcode;
3992 xtensa_isa isa = xtensa_default_isa;
3993 uint32 regno, const16_regno, call_regno;
3996 if (insnbuf == NULL)
3998 insnbuf = xtensa_insnbuf_alloc (isa);
3999 slotbuf = xtensa_insnbuf_alloc (isa);
4002 xtensa_insnbuf_from_chars (isa, insnbuf, buf, bufsize);
4003 fmt = xtensa_format_decode (isa, insnbuf);
4004 if (fmt == XTENSA_UNDEFINED
4005 || xtensa_format_get_slot (isa, fmt, 0, insnbuf, slotbuf))
4006 return XTENSA_UNDEFINED;
4008 opcode = xtensa_opcode_decode (isa, fmt, 0, slotbuf);
4009 if (opcode == XTENSA_UNDEFINED)
4010 return XTENSA_UNDEFINED;
4012 if (opcode == get_l32r_opcode ())
4015 *p_uses_l32r = TRUE;
4016 if (xtensa_operand_get_field (isa, opcode, L32R_TARGET_REG_OPERAND,
4017 fmt, 0, slotbuf, ®no)
4018 || xtensa_operand_decode (isa, opcode, L32R_TARGET_REG_OPERAND,
4020 return XTENSA_UNDEFINED;
4022 else if (opcode == get_const16_opcode ())
4025 *p_uses_l32r = FALSE;
4026 if (xtensa_operand_get_field (isa, opcode, CONST16_TARGET_REG_OPERAND,
4027 fmt, 0, slotbuf, ®no)
4028 || xtensa_operand_decode (isa, opcode, CONST16_TARGET_REG_OPERAND,
4030 return XTENSA_UNDEFINED;
4032 /* Check that the next instruction is also CONST16. */
4033 offset += xtensa_format_length (isa, fmt);
4034 xtensa_insnbuf_from_chars (isa, insnbuf, buf + offset, bufsize - offset);
4035 fmt = xtensa_format_decode (isa, insnbuf);
4036 if (fmt == XTENSA_UNDEFINED
4037 || xtensa_format_get_slot (isa, fmt, 0, insnbuf, slotbuf))
4038 return XTENSA_UNDEFINED;
4039 opcode = xtensa_opcode_decode (isa, fmt, 0, slotbuf);
4040 if (opcode != get_const16_opcode ())
4041 return XTENSA_UNDEFINED;
4043 if (xtensa_operand_get_field (isa, opcode, CONST16_TARGET_REG_OPERAND,
4044 fmt, 0, slotbuf, &const16_regno)
4045 || xtensa_operand_decode (isa, opcode, CONST16_TARGET_REG_OPERAND,
4047 || const16_regno != regno)
4048 return XTENSA_UNDEFINED;
4051 return XTENSA_UNDEFINED;
4053 /* Next instruction should be an CALLXn with operand 0 == regno. */
4054 offset += xtensa_format_length (isa, fmt);
4055 xtensa_insnbuf_from_chars (isa, insnbuf, buf + offset, bufsize - offset);
4056 fmt = xtensa_format_decode (isa, insnbuf);
4057 if (fmt == XTENSA_UNDEFINED
4058 || xtensa_format_get_slot (isa, fmt, 0, insnbuf, slotbuf))
4059 return XTENSA_UNDEFINED;
4060 opcode = xtensa_opcode_decode (isa, fmt, 0, slotbuf);
4061 if (opcode == XTENSA_UNDEFINED
4062 || !is_indirect_call_opcode (opcode))
4063 return XTENSA_UNDEFINED;
4065 if (xtensa_operand_get_field (isa, opcode, CALLN_SOURCE_OPERAND,
4066 fmt, 0, slotbuf, &call_regno)
4067 || xtensa_operand_decode (isa, opcode, CALLN_SOURCE_OPERAND,
4069 return XTENSA_UNDEFINED;
4071 if (call_regno != regno)
4072 return XTENSA_UNDEFINED;
4078 /* Data structures used during relaxation. */
4080 /* r_reloc: relocation values. */
4082 /* Through the relaxation process, we need to keep track of the values
4083 that will result from evaluating relocations. The standard ELF
4084 relocation structure is not sufficient for this purpose because we're
4085 operating on multiple input files at once, so we need to know which
4086 input file a relocation refers to. The r_reloc structure thus
4087 records both the input file (bfd) and ELF relocation.
4089 For efficiency, an r_reloc also contains a "target_offset" field to
4090 cache the target-section-relative offset value that is represented by
4093 The r_reloc also contains a virtual offset that allows multiple
4094 inserted literals to be placed at the same "address" with
4095 different offsets. */
4097 typedef struct r_reloc_struct r_reloc;
4099 struct r_reloc_struct
4102 Elf_Internal_Rela rela;
4103 bfd_vma target_offset;
4104 bfd_vma virtual_offset;
4108 /* The r_reloc structure is included by value in literal_value, but not
4109 every literal_value has an associated relocation -- some are simple
4110 constants. In such cases, we set all the fields in the r_reloc
4111 struct to zero. The r_reloc_is_const function should be used to
4112 detect this case. */
4115 r_reloc_is_const (const r_reloc *r_rel)
4117 return (r_rel->abfd == NULL);
4122 r_reloc_get_target_offset (const r_reloc *r_rel)
4124 bfd_vma target_offset;
4125 unsigned long r_symndx;
4127 BFD_ASSERT (!r_reloc_is_const (r_rel));
4128 r_symndx = ELF32_R_SYM (r_rel->rela.r_info);
4129 target_offset = get_elf_r_symndx_offset (r_rel->abfd, r_symndx);
4130 return (target_offset + r_rel->rela.r_addend);
4134 static struct elf_link_hash_entry *
4135 r_reloc_get_hash_entry (const r_reloc *r_rel)
4137 unsigned long r_symndx = ELF32_R_SYM (r_rel->rela.r_info);
4138 return get_elf_r_symndx_hash_entry (r_rel->abfd, r_symndx);
4143 r_reloc_get_section (const r_reloc *r_rel)
4145 unsigned long r_symndx = ELF32_R_SYM (r_rel->rela.r_info);
4146 return get_elf_r_symndx_section (r_rel->abfd, r_symndx);
4151 r_reloc_is_defined (const r_reloc *r_rel)
4157 sec = r_reloc_get_section (r_rel);
4158 if (sec == bfd_abs_section_ptr
4159 || sec == bfd_com_section_ptr
4160 || sec == bfd_und_section_ptr)
4167 r_reloc_init (r_reloc *r_rel,
4169 Elf_Internal_Rela *irel,
4171 bfd_size_type content_length)
4174 reloc_howto_type *howto;
4178 r_rel->rela = *irel;
4180 r_rel->target_offset = r_reloc_get_target_offset (r_rel);
4181 r_rel->virtual_offset = 0;
4182 r_type = ELF32_R_TYPE (r_rel->rela.r_info);
4183 howto = &elf_howto_table[r_type];
4184 if (howto->partial_inplace)
4186 bfd_vma inplace_val;
4187 BFD_ASSERT (r_rel->rela.r_offset < content_length);
4189 inplace_val = bfd_get_32 (abfd, &contents[r_rel->rela.r_offset]);
4190 r_rel->target_offset += inplace_val;
4194 memset (r_rel, 0, sizeof (r_reloc));
4201 print_r_reloc (FILE *fp, const r_reloc *r_rel)
4203 if (r_reloc_is_defined (r_rel))
4205 asection *sec = r_reloc_get_section (r_rel);
4206 fprintf (fp, " %s(%s + ", sec->owner->filename, sec->name);
4208 else if (r_reloc_get_hash_entry (r_rel))
4209 fprintf (fp, " %s + ", r_reloc_get_hash_entry (r_rel)->root.root.string);
4211 fprintf (fp, " ?? + ");
4213 fprintf_vma (fp, r_rel->target_offset);
4214 if (r_rel->virtual_offset)
4216 fprintf (fp, " + ");
4217 fprintf_vma (fp, r_rel->virtual_offset);
4226 /* source_reloc: relocations that reference literals. */
4228 /* To determine whether literals can be coalesced, we need to first
4229 record all the relocations that reference the literals. The
4230 source_reloc structure below is used for this purpose. The
4231 source_reloc entries are kept in a per-literal-section array, sorted
4232 by offset within the literal section (i.e., target offset).
4234 The source_sec and r_rel.rela.r_offset fields identify the source of
4235 the relocation. The r_rel field records the relocation value, i.e.,
4236 the offset of the literal being referenced. The opnd field is needed
4237 to determine the range of the immediate field to which the relocation
4238 applies, so we can determine whether another literal with the same
4239 value is within range. The is_null field is true when the relocation
4240 is being removed (e.g., when an L32R is being removed due to a CALLX
4241 that is converted to a direct CALL). */
4243 typedef struct source_reloc_struct source_reloc;
4245 struct source_reloc_struct
4247 asection *source_sec;
4249 xtensa_opcode opcode;
4251 bfd_boolean is_null;
4252 bfd_boolean is_abs_literal;
4257 init_source_reloc (source_reloc *reloc,
4258 asection *source_sec,
4259 const r_reloc *r_rel,
4260 xtensa_opcode opcode,
4262 bfd_boolean is_abs_literal)
4264 reloc->source_sec = source_sec;
4265 reloc->r_rel = *r_rel;
4266 reloc->opcode = opcode;
4268 reloc->is_null = FALSE;
4269 reloc->is_abs_literal = is_abs_literal;
4273 /* Find the source_reloc for a particular source offset and relocation
4274 type. Note that the array is sorted by _target_ offset, so this is
4275 just a linear search. */
4277 static source_reloc *
4278 find_source_reloc (source_reloc *src_relocs,
4281 Elf_Internal_Rela *irel)
4285 for (i = 0; i < src_count; i++)
4287 if (src_relocs[i].source_sec == sec
4288 && src_relocs[i].r_rel.rela.r_offset == irel->r_offset
4289 && (ELF32_R_TYPE (src_relocs[i].r_rel.rela.r_info)
4290 == ELF32_R_TYPE (irel->r_info)))
4291 return &src_relocs[i];
4299 source_reloc_compare (const void *ap, const void *bp)
4301 const source_reloc *a = (const source_reloc *) ap;
4302 const source_reloc *b = (const source_reloc *) bp;
4304 if (a->r_rel.target_offset != b->r_rel.target_offset)
4305 return (a->r_rel.target_offset - b->r_rel.target_offset);
4307 /* We don't need to sort on these criteria for correctness,
4308 but enforcing a more strict ordering prevents unstable qsort
4309 from behaving differently with different implementations.
4310 Without the code below we get correct but different results
4311 on Solaris 2.7 and 2.8. We would like to always produce the
4312 same results no matter the host. */
4314 if ((!a->is_null) - (!b->is_null))
4315 return ((!a->is_null) - (!b->is_null));
4316 return internal_reloc_compare (&a->r_rel.rela, &b->r_rel.rela);
4320 /* Literal values and value hash tables. */
4322 /* Literals with the same value can be coalesced. The literal_value
4323 structure records the value of a literal: the "r_rel" field holds the
4324 information from the relocation on the literal (if there is one) and
4325 the "value" field holds the contents of the literal word itself.
4327 The value_map structure records a literal value along with the
4328 location of a literal holding that value. The value_map hash table
4329 is indexed by the literal value, so that we can quickly check if a
4330 particular literal value has been seen before and is thus a candidate
4333 typedef struct literal_value_struct literal_value;
4334 typedef struct value_map_struct value_map;
4335 typedef struct value_map_hash_table_struct value_map_hash_table;
4337 struct literal_value_struct
4340 unsigned long value;
4341 bfd_boolean is_abs_literal;
4344 struct value_map_struct
4346 literal_value val; /* The literal value. */
4347 r_reloc loc; /* Location of the literal. */
4351 struct value_map_hash_table_struct
4353 unsigned bucket_count;
4354 value_map **buckets;
4356 bfd_boolean has_last_loc;
4362 init_literal_value (literal_value *lit,
4363 const r_reloc *r_rel,
4364 unsigned long value,
4365 bfd_boolean is_abs_literal)
4367 lit->r_rel = *r_rel;
4369 lit->is_abs_literal = is_abs_literal;
4374 literal_value_equal (const literal_value *src1,
4375 const literal_value *src2,
4376 bfd_boolean final_static_link)
4378 struct elf_link_hash_entry *h1, *h2;
4380 if (r_reloc_is_const (&src1->r_rel) != r_reloc_is_const (&src2->r_rel))
4383 if (r_reloc_is_const (&src1->r_rel))
4384 return (src1->value == src2->value);
4386 if (ELF32_R_TYPE (src1->r_rel.rela.r_info)
4387 != ELF32_R_TYPE (src2->r_rel.rela.r_info))
4390 if (src1->r_rel.target_offset != src2->r_rel.target_offset)
4393 if (src1->r_rel.virtual_offset != src2->r_rel.virtual_offset)
4396 if (src1->value != src2->value)
4399 /* Now check for the same section (if defined) or the same elf_hash
4400 (if undefined or weak). */
4401 h1 = r_reloc_get_hash_entry (&src1->r_rel);
4402 h2 = r_reloc_get_hash_entry (&src2->r_rel);
4403 if (r_reloc_is_defined (&src1->r_rel)
4404 && (final_static_link
4405 || ((!h1 || h1->root.type != bfd_link_hash_defweak)
4406 && (!h2 || h2->root.type != bfd_link_hash_defweak))))
4408 if (r_reloc_get_section (&src1->r_rel)
4409 != r_reloc_get_section (&src2->r_rel))
4414 /* Require that the hash entries (i.e., symbols) be identical. */
4415 if (h1 != h2 || h1 == 0)
4419 if (src1->is_abs_literal != src2->is_abs_literal)
4426 /* Must be power of 2. */
4427 #define INITIAL_HASH_RELOC_BUCKET_COUNT 1024
4429 static value_map_hash_table *
4430 value_map_hash_table_init (void)
4432 value_map_hash_table *values;
4434 values = (value_map_hash_table *)
4435 bfd_zmalloc (sizeof (value_map_hash_table));
4436 values->bucket_count = INITIAL_HASH_RELOC_BUCKET_COUNT;
4438 values->buckets = (value_map **)
4439 bfd_zmalloc (sizeof (value_map *) * values->bucket_count);
4440 if (values->buckets == NULL)
4445 values->has_last_loc = FALSE;
4452 value_map_hash_table_delete (value_map_hash_table *table)
4454 free (table->buckets);
4460 hash_bfd_vma (bfd_vma val)
4462 return (val >> 2) + (val >> 10);
4467 literal_value_hash (const literal_value *src)
4471 hash_val = hash_bfd_vma (src->value);
4472 if (!r_reloc_is_const (&src->r_rel))
4476 hash_val += hash_bfd_vma (src->is_abs_literal * 1000);
4477 hash_val += hash_bfd_vma (src->r_rel.target_offset);
4478 hash_val += hash_bfd_vma (src->r_rel.virtual_offset);
4480 /* Now check for the same section and the same elf_hash. */
4481 if (r_reloc_is_defined (&src->r_rel))
4482 sec_or_hash = r_reloc_get_section (&src->r_rel);
4484 sec_or_hash = r_reloc_get_hash_entry (&src->r_rel);
4485 hash_val += hash_bfd_vma ((bfd_vma) (size_t) sec_or_hash);
4491 /* Check if the specified literal_value has been seen before. */
4494 value_map_get_cached_value (value_map_hash_table *map,
4495 const literal_value *val,
4496 bfd_boolean final_static_link)
4502 idx = literal_value_hash (val);
4503 idx = idx & (map->bucket_count - 1);
4504 bucket = map->buckets[idx];
4505 for (map_e = bucket; map_e; map_e = map_e->next)
4507 if (literal_value_equal (&map_e->val, val, final_static_link))
4514 /* Record a new literal value. It is illegal to call this if VALUE
4515 already has an entry here. */
4518 add_value_map (value_map_hash_table *map,
4519 const literal_value *val,
4521 bfd_boolean final_static_link)
4523 value_map **bucket_p;
4526 value_map *val_e = (value_map *) bfd_zmalloc (sizeof (value_map));
4529 bfd_set_error (bfd_error_no_memory);
4533 BFD_ASSERT (!value_map_get_cached_value (map, val, final_static_link));
4537 idx = literal_value_hash (val);
4538 idx = idx & (map->bucket_count - 1);
4539 bucket_p = &map->buckets[idx];
4541 val_e->next = *bucket_p;
4544 /* FIXME: Consider resizing the hash table if we get too many entries. */
4550 /* Lists of text actions (ta_) for narrowing, widening, longcall
4551 conversion, space fill, code & literal removal, etc. */
4553 /* The following text actions are generated:
4555 "ta_remove_insn" remove an instruction or instructions
4556 "ta_remove_longcall" convert longcall to call
4557 "ta_convert_longcall" convert longcall to nop/call
4558 "ta_narrow_insn" narrow a wide instruction
4559 "ta_widen" widen a narrow instruction
4560 "ta_fill" add fill or remove fill
4561 removed < 0 is a fill; branches to the fill address will be
4562 changed to address + fill size (e.g., address - removed)
4563 removed >= 0 branches to the fill address will stay unchanged
4564 "ta_remove_literal" remove a literal; this action is
4565 indicated when a literal is removed
4567 "ta_add_literal" insert a new literal; this action is
4568 indicated when a literal has been moved.
4569 It may use a virtual_offset because
4570 multiple literals can be placed at the
4573 For each of these text actions, we also record the number of bytes
4574 removed by performing the text action. In the case of a "ta_widen"
4575 or a "ta_fill" that adds space, the removed_bytes will be negative. */
4577 typedef struct text_action_struct text_action;
4578 typedef struct text_action_list_struct text_action_list;
4579 typedef enum text_action_enum_t text_action_t;
4581 enum text_action_enum_t
4584 ta_remove_insn, /* removed = -size */
4585 ta_remove_longcall, /* removed = -size */
4586 ta_convert_longcall, /* removed = 0 */
4587 ta_narrow_insn, /* removed = -1 */
4588 ta_widen_insn, /* removed = +1 */
4589 ta_fill, /* removed = +size */
4595 /* Structure for a text action record. */
4596 struct text_action_struct
4598 text_action_t action;
4599 asection *sec; /* Optional */
4601 bfd_vma virtual_offset; /* Zero except for adding literals. */
4603 literal_value value; /* Only valid when adding literals. */
4609 /* List of all of the actions taken on a text section. */
4610 struct text_action_list_struct
4616 static text_action *
4617 find_fill_action (text_action_list *l, asection *sec, bfd_vma offset)
4621 /* It is not necessary to fill at the end of a section. */
4622 if (sec->size == offset)
4625 for (m_p = &l->head; *m_p && (*m_p)->offset <= offset; m_p = &(*m_p)->next)
4627 text_action *t = *m_p;
4628 /* When the action is another fill at the same address,
4629 just increase the size. */
4630 if (t->offset == offset && t->action == ta_fill)
4638 compute_removed_action_diff (const text_action *ta,
4642 int removable_space)
4645 int current_removed = 0;
4648 current_removed = ta->removed_bytes;
4650 BFD_ASSERT (ta == NULL || ta->offset == offset);
4651 BFD_ASSERT (ta == NULL || ta->action == ta_fill);
4653 /* It is not necessary to fill at the end of a section. Clean this up. */
4654 if (sec->size == offset)
4655 new_removed = removable_space - 0;
4659 int added = -removed - current_removed;
4660 /* Ignore multiples of the section alignment. */
4661 added = ((1 << sec->alignment_power) - 1) & added;
4662 new_removed = (-added);
4664 /* Modify for removable. */
4665 space = removable_space - new_removed;
4666 new_removed = (removable_space
4667 - (((1 << sec->alignment_power) - 1) & space));
4669 return (new_removed - current_removed);
4674 adjust_fill_action (text_action *ta, int fill_diff)
4676 ta->removed_bytes += fill_diff;
4680 /* Add a modification action to the text. For the case of adding or
4681 removing space, modify any current fill and assume that
4682 "unreachable_space" bytes can be freely contracted. Note that a
4683 negative removed value is a fill. */
4686 text_action_add (text_action_list *l,
4687 text_action_t action,
4695 /* It is not necessary to fill at the end of a section. */
4696 if (action == ta_fill && sec->size == offset)
4699 /* It is not necessary to fill 0 bytes. */
4700 if (action == ta_fill && removed == 0)
4703 for (m_p = &l->head; *m_p && (*m_p)->offset <= offset; m_p = &(*m_p)->next)
4705 text_action *t = *m_p;
4706 /* When the action is another fill at the same address,
4707 just increase the size. */
4708 if (t->offset == offset && t->action == ta_fill && action == ta_fill)
4710 t->removed_bytes += removed;
4715 /* Create a new record and fill it up. */
4716 ta = (text_action *) bfd_zmalloc (sizeof (text_action));
4717 ta->action = action;
4719 ta->offset = offset;
4720 ta->removed_bytes = removed;
4727 text_action_add_literal (text_action_list *l,
4728 text_action_t action,
4730 const literal_value *value,
4735 asection *sec = r_reloc_get_section (loc);
4736 bfd_vma offset = loc->target_offset;
4737 bfd_vma virtual_offset = loc->virtual_offset;
4739 BFD_ASSERT (action == ta_add_literal);
4741 for (m_p = &l->head; *m_p != NULL; m_p = &(*m_p)->next)
4743 if ((*m_p)->offset > offset
4744 && ((*m_p)->offset != offset
4745 || (*m_p)->virtual_offset > virtual_offset))
4749 /* Create a new record and fill it up. */
4750 ta = (text_action *) bfd_zmalloc (sizeof (text_action));
4751 ta->action = action;
4753 ta->offset = offset;
4754 ta->virtual_offset = virtual_offset;
4756 ta->removed_bytes = removed;
4762 /* Find the total offset adjustment for the relaxations specified by
4763 text_actions, beginning from a particular starting action. This is
4764 typically used from offset_with_removed_text to search an entire list of
4765 actions, but it may also be called directly when adjusting adjacent offsets
4766 so that each search may begin where the previous one left off. */
4769 removed_by_actions (text_action **p_start_action,
4771 bfd_boolean before_fill)
4776 r = *p_start_action;
4779 if (r->offset > offset)
4782 if (r->offset == offset
4783 && (before_fill || r->action != ta_fill || r->removed_bytes >= 0))
4786 removed += r->removed_bytes;
4791 *p_start_action = r;
4797 offset_with_removed_text (text_action_list *action_list, bfd_vma offset)
4799 text_action *r = action_list->head;
4800 return offset - removed_by_actions (&r, offset, FALSE);
4805 action_list_count (text_action_list *action_list)
4807 text_action *r = action_list->head;
4809 for (r = action_list->head; r != NULL; r = r->next)
4817 /* The find_insn_action routine will only find non-fill actions. */
4819 static text_action *
4820 find_insn_action (text_action_list *action_list, bfd_vma offset)
4823 for (t = action_list->head; t; t = t->next)
4825 if (t->offset == offset)
4832 case ta_remove_insn:
4833 case ta_remove_longcall:
4834 case ta_convert_longcall:
4835 case ta_narrow_insn:
4838 case ta_remove_literal:
4839 case ta_add_literal:
4852 print_action_list (FILE *fp, text_action_list *action_list)
4856 fprintf (fp, "Text Action\n");
4857 for (r = action_list->head; r != NULL; r = r->next)
4859 const char *t = "unknown";
4862 case ta_remove_insn:
4863 t = "remove_insn"; break;
4864 case ta_remove_longcall:
4865 t = "remove_longcall"; break;
4866 case ta_convert_longcall:
4867 t = "convert_longcall"; break;
4868 case ta_narrow_insn:
4869 t = "narrow_insn"; break;
4871 t = "widen_insn"; break;
4876 case ta_remove_literal:
4877 t = "remove_literal"; break;
4878 case ta_add_literal:
4879 t = "add_literal"; break;
4882 fprintf (fp, "%s: %s[0x%lx] \"%s\" %d\n",
4883 r->sec->owner->filename,
4884 r->sec->name, r->offset, t, r->removed_bytes);
4891 /* Lists of literals being coalesced or removed. */
4893 /* In the usual case, the literal identified by "from" is being
4894 coalesced with another literal identified by "to". If the literal is
4895 unused and is being removed altogether, "to.abfd" will be NULL.
4896 The removed_literal entries are kept on a per-section list, sorted
4897 by the "from" offset field. */
4899 typedef struct removed_literal_struct removed_literal;
4900 typedef struct removed_literal_list_struct removed_literal_list;
4902 struct removed_literal_struct
4906 removed_literal *next;
4909 struct removed_literal_list_struct
4911 removed_literal *head;
4912 removed_literal *tail;
4916 /* Record that the literal at "from" is being removed. If "to" is not
4917 NULL, the "from" literal is being coalesced with the "to" literal. */
4920 add_removed_literal (removed_literal_list *removed_list,
4921 const r_reloc *from,
4924 removed_literal *r, *new_r, *next_r;
4926 new_r = (removed_literal *) bfd_zmalloc (sizeof (removed_literal));
4928 new_r->from = *from;
4932 new_r->to.abfd = NULL;
4935 r = removed_list->head;
4938 removed_list->head = new_r;
4939 removed_list->tail = new_r;
4941 /* Special check for common case of append. */
4942 else if (removed_list->tail->from.target_offset < from->target_offset)
4944 removed_list->tail->next = new_r;
4945 removed_list->tail = new_r;
4949 while (r->from.target_offset < from->target_offset && r->next)
4955 new_r->next = next_r;
4957 removed_list->tail = new_r;
4962 /* Check if the list of removed literals contains an entry for the
4963 given address. Return the entry if found. */
4965 static removed_literal *
4966 find_removed_literal (removed_literal_list *removed_list, bfd_vma addr)
4968 removed_literal *r = removed_list->head;
4969 while (r && r->from.target_offset < addr)
4971 if (r && r->from.target_offset == addr)
4980 print_removed_literals (FILE *fp, removed_literal_list *removed_list)
4983 r = removed_list->head;
4985 fprintf (fp, "Removed Literals\n");
4986 for (; r != NULL; r = r->next)
4988 print_r_reloc (fp, &r->from);
4989 fprintf (fp, " => ");
4990 if (r->to.abfd == NULL)
4991 fprintf (fp, "REMOVED");
4993 print_r_reloc (fp, &r->to);
5001 /* Per-section data for relaxation. */
5003 typedef struct reloc_bfd_fix_struct reloc_bfd_fix;
5005 struct xtensa_relax_info_struct
5007 bfd_boolean is_relaxable_literal_section;
5008 bfd_boolean is_relaxable_asm_section;
5009 int visited; /* Number of times visited. */
5011 source_reloc *src_relocs; /* Array[src_count]. */
5013 int src_next; /* Next src_relocs entry to assign. */
5015 removed_literal_list removed_list;
5016 text_action_list action_list;
5018 reloc_bfd_fix *fix_list;
5019 reloc_bfd_fix *fix_array;
5020 unsigned fix_array_count;
5022 /* Support for expanding the reloc array that is stored
5023 in the section structure. If the relocations have been
5024 reallocated, the newly allocated relocations will be referenced
5025 here along with the actual size allocated. The relocation
5026 count will always be found in the section structure. */
5027 Elf_Internal_Rela *allocated_relocs;
5028 unsigned relocs_count;
5029 unsigned allocated_relocs_count;
5032 struct elf_xtensa_section_data
5034 struct bfd_elf_section_data elf;
5035 xtensa_relax_info relax_info;
5040 elf_xtensa_new_section_hook (bfd *abfd, asection *sec)
5042 if (!sec->used_by_bfd)
5044 struct elf_xtensa_section_data *sdata;
5045 bfd_size_type amt = sizeof (*sdata);
5047 sdata = bfd_zalloc (abfd, amt);
5050 sec->used_by_bfd = sdata;
5053 return _bfd_elf_new_section_hook (abfd, sec);
5057 static xtensa_relax_info *
5058 get_xtensa_relax_info (asection *sec)
5060 struct elf_xtensa_section_data *section_data;
5062 /* No info available if no section or if it is an output section. */
5063 if (!sec || sec == sec->output_section)
5066 section_data = (struct elf_xtensa_section_data *) elf_section_data (sec);
5067 return §ion_data->relax_info;
5072 init_xtensa_relax_info (asection *sec)
5074 xtensa_relax_info *relax_info = get_xtensa_relax_info (sec);
5076 relax_info->is_relaxable_literal_section = FALSE;
5077 relax_info->is_relaxable_asm_section = FALSE;
5078 relax_info->visited = 0;
5080 relax_info->src_relocs = NULL;
5081 relax_info->src_count = 0;
5082 relax_info->src_next = 0;
5084 relax_info->removed_list.head = NULL;
5085 relax_info->removed_list.tail = NULL;
5087 relax_info->action_list.head = NULL;
5089 relax_info->fix_list = NULL;
5090 relax_info->fix_array = NULL;
5091 relax_info->fix_array_count = 0;
5093 relax_info->allocated_relocs = NULL;
5094 relax_info->relocs_count = 0;
5095 relax_info->allocated_relocs_count = 0;
5099 /* Coalescing literals may require a relocation to refer to a section in
5100 a different input file, but the standard relocation information
5101 cannot express that. Instead, the reloc_bfd_fix structures are used
5102 to "fix" the relocations that refer to sections in other input files.
5103 These structures are kept on per-section lists. The "src_type" field
5104 records the relocation type in case there are multiple relocations on
5105 the same location. FIXME: This is ugly; an alternative might be to
5106 add new symbols with the "owner" field to some other input file. */
5108 struct reloc_bfd_fix_struct
5112 unsigned src_type; /* Relocation type. */
5114 asection *target_sec;
5115 bfd_vma target_offset;
5116 bfd_boolean translated;
5118 reloc_bfd_fix *next;
5122 static reloc_bfd_fix *
5123 reloc_bfd_fix_init (asection *src_sec,
5126 asection *target_sec,
5127 bfd_vma target_offset,
5128 bfd_boolean translated)
5132 fix = (reloc_bfd_fix *) bfd_malloc (sizeof (reloc_bfd_fix));
5133 fix->src_sec = src_sec;
5134 fix->src_offset = src_offset;
5135 fix->src_type = src_type;
5136 fix->target_sec = target_sec;
5137 fix->target_offset = target_offset;
5138 fix->translated = translated;
5145 add_fix (asection *src_sec, reloc_bfd_fix *fix)
5147 xtensa_relax_info *relax_info;
5149 relax_info = get_xtensa_relax_info (src_sec);
5150 fix->next = relax_info->fix_list;
5151 relax_info->fix_list = fix;
5156 fix_compare (const void *ap, const void *bp)
5158 const reloc_bfd_fix *a = (const reloc_bfd_fix *) ap;
5159 const reloc_bfd_fix *b = (const reloc_bfd_fix *) bp;
5161 if (a->src_offset != b->src_offset)
5162 return (a->src_offset - b->src_offset);
5163 return (a->src_type - b->src_type);
5168 cache_fix_array (asection *sec)
5170 unsigned i, count = 0;
5172 xtensa_relax_info *relax_info = get_xtensa_relax_info (sec);
5174 if (relax_info == NULL)
5176 if (relax_info->fix_list == NULL)
5179 for (r = relax_info->fix_list; r != NULL; r = r->next)
5182 relax_info->fix_array =
5183 (reloc_bfd_fix *) bfd_malloc (sizeof (reloc_bfd_fix) * count);
5184 relax_info->fix_array_count = count;
5186 r = relax_info->fix_list;
5187 for (i = 0; i < count; i++, r = r->next)
5189 relax_info->fix_array[count - 1 - i] = *r;
5190 relax_info->fix_array[count - 1 - i].next = NULL;
5193 qsort (relax_info->fix_array, relax_info->fix_array_count,
5194 sizeof (reloc_bfd_fix), fix_compare);
5198 static reloc_bfd_fix *
5199 get_bfd_fix (asection *sec, bfd_vma offset, unsigned type)
5201 xtensa_relax_info *relax_info = get_xtensa_relax_info (sec);
5205 if (relax_info == NULL)
5207 if (relax_info->fix_list == NULL)
5210 if (relax_info->fix_array == NULL)
5211 cache_fix_array (sec);
5213 key.src_offset = offset;
5214 key.src_type = type;
5215 rv = bsearch (&key, relax_info->fix_array, relax_info->fix_array_count,
5216 sizeof (reloc_bfd_fix), fix_compare);
5221 /* Section caching. */
5223 typedef struct section_cache_struct section_cache_t;
5225 struct section_cache_struct
5229 bfd_byte *contents; /* Cache of the section contents. */
5230 bfd_size_type content_length;
5232 property_table_entry *ptbl; /* Cache of the section property table. */
5235 Elf_Internal_Rela *relocs; /* Cache of the section relocations. */
5236 unsigned reloc_count;
5241 init_section_cache (section_cache_t *sec_cache)
5243 memset (sec_cache, 0, sizeof (*sec_cache));
5248 clear_section_cache (section_cache_t *sec_cache)
5252 release_contents (sec_cache->sec, sec_cache->contents);
5253 release_internal_relocs (sec_cache->sec, sec_cache->relocs);
5254 if (sec_cache->ptbl)
5255 free (sec_cache->ptbl);
5256 memset (sec_cache, 0, sizeof (sec_cache));
5262 section_cache_section (section_cache_t *sec_cache,
5264 struct bfd_link_info *link_info)
5267 property_table_entry *prop_table = NULL;
5269 bfd_byte *contents = NULL;
5270 Elf_Internal_Rela *internal_relocs = NULL;
5271 bfd_size_type sec_size;
5275 if (sec == sec_cache->sec)
5279 sec_size = bfd_get_section_limit (abfd, sec);
5281 /* Get the contents. */
5282 contents = retrieve_contents (abfd, sec, link_info->keep_memory);
5283 if (contents == NULL && sec_size != 0)
5286 /* Get the relocations. */
5287 internal_relocs = retrieve_internal_relocs (abfd, sec,
5288 link_info->keep_memory);
5290 /* Get the entry table. */
5291 ptblsize = xtensa_read_table_entries (abfd, sec, &prop_table,
5292 XTENSA_PROP_SEC_NAME, FALSE);
5296 /* Fill in the new section cache. */
5297 clear_section_cache (sec_cache);
5298 memset (sec_cache, 0, sizeof (sec_cache));
5300 sec_cache->sec = sec;
5301 sec_cache->contents = contents;
5302 sec_cache->content_length = sec_size;
5303 sec_cache->relocs = internal_relocs;
5304 sec_cache->reloc_count = sec->reloc_count;
5305 sec_cache->pte_count = ptblsize;
5306 sec_cache->ptbl = prop_table;
5311 release_contents (sec, contents);
5312 release_internal_relocs (sec, internal_relocs);
5319 /* Extended basic blocks. */
5321 /* An ebb_struct represents an Extended Basic Block. Within this
5322 range, we guarantee that all instructions are decodable, the
5323 property table entries are contiguous, and no property table
5324 specifies a segment that cannot have instructions moved. This
5325 structure contains caches of the contents, property table and
5326 relocations for the specified section for easy use. The range is
5327 specified by ranges of indices for the byte offset, property table
5328 offsets and relocation offsets. These must be consistent. */
5330 typedef struct ebb_struct ebb_t;
5336 bfd_byte *contents; /* Cache of the section contents. */
5337 bfd_size_type content_length;
5339 property_table_entry *ptbl; /* Cache of the section property table. */
5342 Elf_Internal_Rela *relocs; /* Cache of the section relocations. */
5343 unsigned reloc_count;
5345 bfd_vma start_offset; /* Offset in section. */
5346 unsigned start_ptbl_idx; /* Offset in the property table. */
5347 unsigned start_reloc_idx; /* Offset in the relocations. */
5350 unsigned end_ptbl_idx;
5351 unsigned end_reloc_idx;
5353 bfd_boolean ends_section; /* Is this the last ebb in a section? */
5355 /* The unreachable property table at the end of this set of blocks;
5356 NULL if the end is not an unreachable block. */
5357 property_table_entry *ends_unreachable;
5361 enum ebb_target_enum
5364 EBB_DESIRE_TGT_ALIGN,
5365 EBB_REQUIRE_TGT_ALIGN,
5366 EBB_REQUIRE_LOOP_ALIGN,
5371 /* proposed_action_struct is similar to the text_action_struct except
5372 that is represents a potential transformation, not one that will
5373 occur. We build a list of these for an extended basic block
5374 and use them to compute the actual actions desired. We must be
5375 careful that the entire set of actual actions we perform do not
5376 break any relocations that would fit if the actions were not
5379 typedef struct proposed_action_struct proposed_action;
5381 struct proposed_action_struct
5383 enum ebb_target_enum align_type; /* for the target alignment */
5384 bfd_vma alignment_pow;
5385 text_action_t action;
5388 bfd_boolean do_action; /* If false, then we will not perform the action. */
5392 /* The ebb_constraint_struct keeps a set of proposed actions for an
5393 extended basic block. */
5395 typedef struct ebb_constraint_struct ebb_constraint;
5397 struct ebb_constraint_struct
5400 bfd_boolean start_movable;
5402 /* Bytes of extra space at the beginning if movable. */
5403 int start_extra_space;
5405 enum ebb_target_enum start_align;
5407 bfd_boolean end_movable;
5409 /* Bytes of extra space at the end if movable. */
5410 int end_extra_space;
5412 unsigned action_count;
5413 unsigned action_allocated;
5415 /* Array of proposed actions. */
5416 proposed_action *actions;
5418 /* Action alignments -- one for each proposed action. */
5419 enum ebb_target_enum *action_aligns;
5424 init_ebb_constraint (ebb_constraint *c)
5426 memset (c, 0, sizeof (ebb_constraint));
5431 free_ebb_constraint (ebb_constraint *c)
5439 init_ebb (ebb_t *ebb,
5442 bfd_size_type content_length,
5443 property_table_entry *prop_table,
5445 Elf_Internal_Rela *internal_relocs,
5446 unsigned reloc_count)
5448 memset (ebb, 0, sizeof (ebb_t));
5450 ebb->contents = contents;
5451 ebb->content_length = content_length;
5452 ebb->ptbl = prop_table;
5453 ebb->pte_count = ptblsize;
5454 ebb->relocs = internal_relocs;
5455 ebb->reloc_count = reloc_count;
5456 ebb->start_offset = 0;
5457 ebb->end_offset = ebb->content_length - 1;
5458 ebb->start_ptbl_idx = 0;
5459 ebb->end_ptbl_idx = ptblsize;
5460 ebb->start_reloc_idx = 0;
5461 ebb->end_reloc_idx = reloc_count;
5465 /* Extend the ebb to all decodable contiguous sections. The algorithm
5466 for building a basic block around an instruction is to push it
5467 forward until we hit the end of a section, an unreachable block or
5468 a block that cannot be transformed. Then we push it backwards
5469 searching for similar conditions. */
5471 static bfd_boolean extend_ebb_bounds_forward (ebb_t *);
5472 static bfd_boolean extend_ebb_bounds_backward (ebb_t *);
5473 static bfd_size_type insn_block_decodable_len
5474 (bfd_byte *, bfd_size_type, bfd_vma, bfd_size_type);
5477 extend_ebb_bounds (ebb_t *ebb)
5479 if (!extend_ebb_bounds_forward (ebb))
5481 if (!extend_ebb_bounds_backward (ebb))
5488 extend_ebb_bounds_forward (ebb_t *ebb)
5490 property_table_entry *the_entry, *new_entry;
5492 the_entry = &ebb->ptbl[ebb->end_ptbl_idx];
5494 /* Stop when (1) we cannot decode an instruction, (2) we are at
5495 the end of the property tables, (3) we hit a non-contiguous property
5496 table entry, (4) we hit a NO_TRANSFORM region. */
5501 bfd_size_type insn_block_len;
5503 entry_end = the_entry->address - ebb->sec->vma + the_entry->size;
5505 insn_block_decodable_len (ebb->contents, ebb->content_length,
5507 entry_end - ebb->end_offset);
5508 if (insn_block_len != (entry_end - ebb->end_offset))
5510 (*_bfd_error_handler)
5511 (_("%B(%A+0x%lx): could not decode instruction; possible configuration mismatch"),
5512 ebb->sec->owner, ebb->sec, ebb->end_offset + insn_block_len);
5515 ebb->end_offset += insn_block_len;
5517 if (ebb->end_offset == ebb->sec->size)
5518 ebb->ends_section = TRUE;
5520 /* Update the reloc counter. */
5521 while (ebb->end_reloc_idx + 1 < ebb->reloc_count
5522 && (ebb->relocs[ebb->end_reloc_idx + 1].r_offset
5525 ebb->end_reloc_idx++;
5528 if (ebb->end_ptbl_idx + 1 == ebb->pte_count)
5531 new_entry = &ebb->ptbl[ebb->end_ptbl_idx + 1];
5532 if (((new_entry->flags & XTENSA_PROP_INSN) == 0)
5533 || ((new_entry->flags & XTENSA_PROP_NO_TRANSFORM) != 0)
5534 || ((the_entry->flags & XTENSA_PROP_ALIGN) != 0))
5537 if (the_entry->address + the_entry->size != new_entry->address)
5540 the_entry = new_entry;
5541 ebb->end_ptbl_idx++;
5544 /* Quick check for an unreachable or end of file just at the end. */
5545 if (ebb->end_ptbl_idx + 1 == ebb->pte_count)
5547 if (ebb->end_offset == ebb->content_length)
5548 ebb->ends_section = TRUE;
5552 new_entry = &ebb->ptbl[ebb->end_ptbl_idx + 1];
5553 if ((new_entry->flags & XTENSA_PROP_UNREACHABLE) != 0
5554 && the_entry->address + the_entry->size == new_entry->address)
5555 ebb->ends_unreachable = new_entry;
5558 /* Any other ending requires exact alignment. */
5564 extend_ebb_bounds_backward (ebb_t *ebb)
5566 property_table_entry *the_entry, *new_entry;
5568 the_entry = &ebb->ptbl[ebb->start_ptbl_idx];
5570 /* Stop when (1) we cannot decode the instructions in the current entry.
5571 (2) we are at the beginning of the property tables, (3) we hit a
5572 non-contiguous property table entry, (4) we hit a NO_TRANSFORM region. */
5576 bfd_vma block_begin;
5577 bfd_size_type insn_block_len;
5579 block_begin = the_entry->address - ebb->sec->vma;
5581 insn_block_decodable_len (ebb->contents, ebb->content_length,
5583 ebb->start_offset - block_begin);
5584 if (insn_block_len != ebb->start_offset - block_begin)
5586 (*_bfd_error_handler)
5587 (_("%B(%A+0x%lx): could not decode instruction; possible configuration mismatch"),
5588 ebb->sec->owner, ebb->sec, ebb->end_offset + insn_block_len);
5591 ebb->start_offset -= insn_block_len;
5593 /* Update the reloc counter. */
5594 while (ebb->start_reloc_idx > 0
5595 && (ebb->relocs[ebb->start_reloc_idx - 1].r_offset
5596 >= ebb->start_offset))
5598 ebb->start_reloc_idx--;
5601 if (ebb->start_ptbl_idx == 0)
5604 new_entry = &ebb->ptbl[ebb->start_ptbl_idx - 1];
5605 if ((new_entry->flags & XTENSA_PROP_INSN) == 0
5606 || ((new_entry->flags & XTENSA_PROP_NO_TRANSFORM) != 0)
5607 || ((new_entry->flags & XTENSA_PROP_ALIGN) != 0))
5609 if (new_entry->address + new_entry->size != the_entry->address)
5612 the_entry = new_entry;
5613 ebb->start_ptbl_idx--;
5619 static bfd_size_type
5620 insn_block_decodable_len (bfd_byte *contents,
5621 bfd_size_type content_len,
5622 bfd_vma block_offset,
5623 bfd_size_type block_len)
5625 bfd_vma offset = block_offset;
5627 while (offset < block_offset + block_len)
5629 bfd_size_type insn_len = 0;
5631 insn_len = insn_decode_len (contents, content_len, offset);
5633 return (offset - block_offset);
5636 return (offset - block_offset);
5641 ebb_propose_action (ebb_constraint *c,
5642 enum ebb_target_enum align_type,
5643 bfd_vma alignment_pow,
5644 text_action_t action,
5647 bfd_boolean do_action)
5649 proposed_action *act;
5651 if (c->action_allocated <= c->action_count)
5653 unsigned new_allocated, i;
5654 proposed_action *new_actions;
5656 new_allocated = (c->action_count + 2) * 2;
5657 new_actions = (proposed_action *)
5658 bfd_zmalloc (sizeof (proposed_action) * new_allocated);
5660 for (i = 0; i < c->action_count; i++)
5661 new_actions[i] = c->actions[i];
5664 c->actions = new_actions;
5665 c->action_allocated = new_allocated;
5668 act = &c->actions[c->action_count];
5669 act->align_type = align_type;
5670 act->alignment_pow = alignment_pow;
5671 act->action = action;
5672 act->offset = offset;
5673 act->removed_bytes = removed_bytes;
5674 act->do_action = do_action;
5680 /* Access to internal relocations, section contents and symbols. */
5682 /* During relaxation, we need to modify relocations, section contents,
5683 and symbol definitions, and we need to keep the original values from
5684 being reloaded from the input files, i.e., we need to "pin" the
5685 modified values in memory. We also want to continue to observe the
5686 setting of the "keep-memory" flag. The following functions wrap the
5687 standard BFD functions to take care of this for us. */
5689 static Elf_Internal_Rela *
5690 retrieve_internal_relocs (bfd *abfd, asection *sec, bfd_boolean keep_memory)
5692 Elf_Internal_Rela *internal_relocs;
5694 if ((sec->flags & SEC_LINKER_CREATED) != 0)
5697 internal_relocs = elf_section_data (sec)->relocs;
5698 if (internal_relocs == NULL)
5699 internal_relocs = (_bfd_elf_link_read_relocs
5700 (abfd, sec, NULL, NULL, keep_memory));
5701 return internal_relocs;
5706 pin_internal_relocs (asection *sec, Elf_Internal_Rela *internal_relocs)
5708 elf_section_data (sec)->relocs = internal_relocs;
5713 release_internal_relocs (asection *sec, Elf_Internal_Rela *internal_relocs)
5716 && elf_section_data (sec)->relocs != internal_relocs)
5717 free (internal_relocs);
5722 retrieve_contents (bfd *abfd, asection *sec, bfd_boolean keep_memory)
5725 bfd_size_type sec_size;
5727 sec_size = bfd_get_section_limit (abfd, sec);
5728 contents = elf_section_data (sec)->this_hdr.contents;
5730 if (contents == NULL && sec_size != 0)
5732 if (!bfd_malloc_and_get_section (abfd, sec, &contents))
5739 elf_section_data (sec)->this_hdr.contents = contents;
5746 pin_contents (asection *sec, bfd_byte *contents)
5748 elf_section_data (sec)->this_hdr.contents = contents;
5753 release_contents (asection *sec, bfd_byte *contents)
5755 if (contents && elf_section_data (sec)->this_hdr.contents != contents)
5760 static Elf_Internal_Sym *
5761 retrieve_local_syms (bfd *input_bfd)
5763 Elf_Internal_Shdr *symtab_hdr;
5764 Elf_Internal_Sym *isymbuf;
5767 symtab_hdr = &elf_tdata (input_bfd)->symtab_hdr;
5768 locsymcount = symtab_hdr->sh_info;
5770 isymbuf = (Elf_Internal_Sym *) symtab_hdr->contents;
5771 if (isymbuf == NULL && locsymcount != 0)
5772 isymbuf = bfd_elf_get_elf_syms (input_bfd, symtab_hdr, locsymcount, 0,
5775 /* Save the symbols for this input file so they won't be read again. */
5776 if (isymbuf && isymbuf != (Elf_Internal_Sym *) symtab_hdr->contents)
5777 symtab_hdr->contents = (unsigned char *) isymbuf;
5783 /* Code for link-time relaxation. */
5785 /* Initialization for relaxation: */
5786 static bfd_boolean analyze_relocations (struct bfd_link_info *);
5787 static bfd_boolean find_relaxable_sections
5788 (bfd *, asection *, struct bfd_link_info *, bfd_boolean *);
5789 static bfd_boolean collect_source_relocs
5790 (bfd *, asection *, struct bfd_link_info *);
5791 static bfd_boolean is_resolvable_asm_expansion
5792 (bfd *, asection *, bfd_byte *, Elf_Internal_Rela *, struct bfd_link_info *,
5794 static Elf_Internal_Rela *find_associated_l32r_irel
5795 (bfd *, asection *, bfd_byte *, Elf_Internal_Rela *, Elf_Internal_Rela *);
5796 static bfd_boolean compute_text_actions
5797 (bfd *, asection *, struct bfd_link_info *);
5798 static bfd_boolean compute_ebb_proposed_actions (ebb_constraint *);
5799 static bfd_boolean compute_ebb_actions (ebb_constraint *);
5800 static bfd_boolean check_section_ebb_pcrels_fit
5801 (bfd *, asection *, bfd_byte *, Elf_Internal_Rela *, const ebb_constraint *,
5802 const xtensa_opcode *);
5803 static bfd_boolean check_section_ebb_reduces (const ebb_constraint *);
5804 static void text_action_add_proposed
5805 (text_action_list *, const ebb_constraint *, asection *);
5806 static int compute_fill_extra_space (property_table_entry *);
5809 static bfd_boolean compute_removed_literals
5810 (bfd *, asection *, struct bfd_link_info *, value_map_hash_table *);
5811 static Elf_Internal_Rela *get_irel_at_offset
5812 (asection *, Elf_Internal_Rela *, bfd_vma);
5813 static bfd_boolean is_removable_literal
5814 (const source_reloc *, int, const source_reloc *, int, asection *,
5815 property_table_entry *, int);
5816 static bfd_boolean remove_dead_literal
5817 (bfd *, asection *, struct bfd_link_info *, Elf_Internal_Rela *,
5818 Elf_Internal_Rela *, source_reloc *, property_table_entry *, int);
5819 static bfd_boolean identify_literal_placement
5820 (bfd *, asection *, bfd_byte *, struct bfd_link_info *,
5821 value_map_hash_table *, bfd_boolean *, Elf_Internal_Rela *, int,
5822 source_reloc *, property_table_entry *, int, section_cache_t *,
5824 static bfd_boolean relocations_reach (source_reloc *, int, const r_reloc *);
5825 static bfd_boolean coalesce_shared_literal
5826 (asection *, source_reloc *, property_table_entry *, int, value_map *);
5827 static bfd_boolean move_shared_literal
5828 (asection *, struct bfd_link_info *, source_reloc *, property_table_entry *,
5829 int, const r_reloc *, const literal_value *, section_cache_t *);
5832 static bfd_boolean relax_section (bfd *, asection *, struct bfd_link_info *);
5833 static bfd_boolean translate_section_fixes (asection *);
5834 static bfd_boolean translate_reloc_bfd_fix (reloc_bfd_fix *);
5835 static asection *translate_reloc (const r_reloc *, r_reloc *, asection *);
5836 static void shrink_dynamic_reloc_sections
5837 (struct bfd_link_info *, bfd *, asection *, Elf_Internal_Rela *);
5838 static bfd_boolean move_literal
5839 (bfd *, struct bfd_link_info *, asection *, bfd_vma, bfd_byte *,
5840 xtensa_relax_info *, Elf_Internal_Rela **, const literal_value *);
5841 static bfd_boolean relax_property_section
5842 (bfd *, asection *, struct bfd_link_info *);
5845 static bfd_boolean relax_section_symbols (bfd *, asection *);
5849 elf_xtensa_relax_section (bfd *abfd,
5851 struct bfd_link_info *link_info,
5854 static value_map_hash_table *values = NULL;
5855 static bfd_boolean relocations_analyzed = FALSE;
5856 xtensa_relax_info *relax_info;
5858 if (!relocations_analyzed)
5860 /* Do some overall initialization for relaxation. */
5861 values = value_map_hash_table_init ();
5864 relaxing_section = TRUE;
5865 if (!analyze_relocations (link_info))
5867 relocations_analyzed = TRUE;
5871 /* Don't mess with linker-created sections. */
5872 if ((sec->flags & SEC_LINKER_CREATED) != 0)
5875 relax_info = get_xtensa_relax_info (sec);
5876 BFD_ASSERT (relax_info != NULL);
5878 switch (relax_info->visited)
5881 /* Note: It would be nice to fold this pass into
5882 analyze_relocations, but it is important for this step that the
5883 sections be examined in link order. */
5884 if (!compute_removed_literals (abfd, sec, link_info, values))
5891 value_map_hash_table_delete (values);
5893 if (!relax_section (abfd, sec, link_info))
5899 if (!relax_section_symbols (abfd, sec))
5904 relax_info->visited++;
5909 /* Initialization for relaxation. */
5911 /* This function is called once at the start of relaxation. It scans
5912 all the input sections and marks the ones that are relaxable (i.e.,
5913 literal sections with L32R relocations against them), and then
5914 collects source_reloc information for all the relocations against
5915 those relaxable sections. During this process, it also detects
5916 longcalls, i.e., calls relaxed by the assembler into indirect
5917 calls, that can be optimized back into direct calls. Within each
5918 extended basic block (ebb) containing an optimized longcall, it
5919 computes a set of "text actions" that can be performed to remove
5920 the L32R associated with the longcall while optionally preserving
5921 branch target alignments. */
5924 analyze_relocations (struct bfd_link_info *link_info)
5928 bfd_boolean is_relaxable = FALSE;
5930 /* Initialize the per-section relaxation info. */
5931 for (abfd = link_info->input_bfds; abfd != NULL; abfd = abfd->link_next)
5932 for (sec = abfd->sections; sec != NULL; sec = sec->next)
5934 init_xtensa_relax_info (sec);
5937 /* Mark relaxable sections (and count relocations against each one). */
5938 for (abfd = link_info->input_bfds; abfd != NULL; abfd = abfd->link_next)
5939 for (sec = abfd->sections; sec != NULL; sec = sec->next)
5941 if (!find_relaxable_sections (abfd, sec, link_info, &is_relaxable))
5945 /* Bail out if there are no relaxable sections. */
5949 /* Allocate space for source_relocs. */
5950 for (abfd = link_info->input_bfds; abfd != NULL; abfd = abfd->link_next)
5951 for (sec = abfd->sections; sec != NULL; sec = sec->next)
5953 xtensa_relax_info *relax_info;
5955 relax_info = get_xtensa_relax_info (sec);
5956 if (relax_info->is_relaxable_literal_section
5957 || relax_info->is_relaxable_asm_section)
5959 relax_info->src_relocs = (source_reloc *)
5960 bfd_malloc (relax_info->src_count * sizeof (source_reloc));
5963 relax_info->src_count = 0;
5966 /* Collect info on relocations against each relaxable section. */
5967 for (abfd = link_info->input_bfds; abfd != NULL; abfd = abfd->link_next)
5968 for (sec = abfd->sections; sec != NULL; sec = sec->next)
5970 if (!collect_source_relocs (abfd, sec, link_info))
5974 /* Compute the text actions. */
5975 for (abfd = link_info->input_bfds; abfd != NULL; abfd = abfd->link_next)
5976 for (sec = abfd->sections; sec != NULL; sec = sec->next)
5978 if (!compute_text_actions (abfd, sec, link_info))
5986 /* Find all the sections that might be relaxed. The motivation for
5987 this pass is that collect_source_relocs() needs to record _all_ the
5988 relocations that target each relaxable section. That is expensive
5989 and unnecessary unless the target section is actually going to be
5990 relaxed. This pass identifies all such sections by checking if
5991 they have L32Rs pointing to them. In the process, the total number
5992 of relocations targeting each section is also counted so that we
5993 know how much space to allocate for source_relocs against each
5994 relaxable literal section. */
5997 find_relaxable_sections (bfd *abfd,
5999 struct bfd_link_info *link_info,
6000 bfd_boolean *is_relaxable_p)
6002 Elf_Internal_Rela *internal_relocs;
6004 bfd_boolean ok = TRUE;
6006 xtensa_relax_info *source_relax_info;
6007 bfd_boolean is_l32r_reloc;
6009 internal_relocs = retrieve_internal_relocs (abfd, sec,
6010 link_info->keep_memory);
6011 if (internal_relocs == NULL)
6014 contents = retrieve_contents (abfd, sec, link_info->keep_memory);
6015 if (contents == NULL && sec->size != 0)
6021 source_relax_info = get_xtensa_relax_info (sec);
6022 for (i = 0; i < sec->reloc_count; i++)
6024 Elf_Internal_Rela *irel = &internal_relocs[i];
6026 asection *target_sec;
6027 xtensa_relax_info *target_relax_info;
6029 /* If this section has not already been marked as "relaxable", and
6030 if it contains any ASM_EXPAND relocations (marking expanded
6031 longcalls) that can be optimized into direct calls, then mark
6032 the section as "relaxable". */
6033 if (source_relax_info
6034 && !source_relax_info->is_relaxable_asm_section
6035 && ELF32_R_TYPE (irel->r_info) == R_XTENSA_ASM_EXPAND)
6037 bfd_boolean is_reachable = FALSE;
6038 if (is_resolvable_asm_expansion (abfd, sec, contents, irel,
6039 link_info, &is_reachable)
6042 source_relax_info->is_relaxable_asm_section = TRUE;
6043 *is_relaxable_p = TRUE;
6047 r_reloc_init (&r_rel, abfd, irel, contents,
6048 bfd_get_section_limit (abfd, sec));
6050 target_sec = r_reloc_get_section (&r_rel);
6051 target_relax_info = get_xtensa_relax_info (target_sec);
6052 if (!target_relax_info)
6055 /* Count PC-relative operand relocations against the target section.
6056 Note: The conditions tested here must match the conditions under
6057 which init_source_reloc is called in collect_source_relocs(). */
6058 is_l32r_reloc = FALSE;
6059 if (is_operand_relocation (ELF32_R_TYPE (irel->r_info)))
6061 xtensa_opcode opcode =
6062 get_relocation_opcode (abfd, sec, contents, irel);
6063 if (opcode != XTENSA_UNDEFINED)
6065 is_l32r_reloc = (opcode == get_l32r_opcode ());
6066 if (!is_alt_relocation (ELF32_R_TYPE (irel->r_info))
6068 target_relax_info->src_count++;
6072 if (is_l32r_reloc && r_reloc_is_defined (&r_rel))
6074 /* Mark the target section as relaxable. */
6075 target_relax_info->is_relaxable_literal_section = TRUE;
6076 *is_relaxable_p = TRUE;
6081 release_contents (sec, contents);
6082 release_internal_relocs (sec, internal_relocs);
6087 /* Record _all_ the relocations that point to relaxable sections, and
6088 get rid of ASM_EXPAND relocs by either converting them to
6089 ASM_SIMPLIFY or by removing them. */
6092 collect_source_relocs (bfd *abfd,
6094 struct bfd_link_info *link_info)
6096 Elf_Internal_Rela *internal_relocs;
6098 bfd_boolean ok = TRUE;
6100 bfd_size_type sec_size;
6102 internal_relocs = retrieve_internal_relocs (abfd, sec,
6103 link_info->keep_memory);
6104 if (internal_relocs == NULL)
6107 sec_size = bfd_get_section_limit (abfd, sec);
6108 contents = retrieve_contents (abfd, sec, link_info->keep_memory);
6109 if (contents == NULL && sec_size != 0)
6115 /* Record relocations against relaxable literal sections. */
6116 for (i = 0; i < sec->reloc_count; i++)
6118 Elf_Internal_Rela *irel = &internal_relocs[i];
6120 asection *target_sec;
6121 xtensa_relax_info *target_relax_info;
6123 r_reloc_init (&r_rel, abfd, irel, contents, sec_size);
6125 target_sec = r_reloc_get_section (&r_rel);
6126 target_relax_info = get_xtensa_relax_info (target_sec);
6128 if (target_relax_info
6129 && (target_relax_info->is_relaxable_literal_section
6130 || target_relax_info->is_relaxable_asm_section))
6132 xtensa_opcode opcode = XTENSA_UNDEFINED;
6134 bfd_boolean is_abs_literal = FALSE;
6136 if (is_alt_relocation (ELF32_R_TYPE (irel->r_info)))
6138 /* None of the current alternate relocs are PC-relative,
6139 and only PC-relative relocs matter here. However, we
6140 still need to record the opcode for literal
6142 opcode = get_relocation_opcode (abfd, sec, contents, irel);
6143 if (opcode == get_l32r_opcode ())
6145 is_abs_literal = TRUE;
6149 opcode = XTENSA_UNDEFINED;
6151 else if (is_operand_relocation (ELF32_R_TYPE (irel->r_info)))
6153 opcode = get_relocation_opcode (abfd, sec, contents, irel);
6154 opnd = get_relocation_opnd (opcode, ELF32_R_TYPE (irel->r_info));
6157 if (opcode != XTENSA_UNDEFINED)
6159 int src_next = target_relax_info->src_next++;
6160 source_reloc *s_reloc = &target_relax_info->src_relocs[src_next];
6162 init_source_reloc (s_reloc, sec, &r_rel, opcode, opnd,
6168 /* Now get rid of ASM_EXPAND relocations. At this point, the
6169 src_relocs array for the target literal section may still be
6170 incomplete, but it must at least contain the entries for the L32R
6171 relocations associated with ASM_EXPANDs because they were just
6172 added in the preceding loop over the relocations. */
6174 for (i = 0; i < sec->reloc_count; i++)
6176 Elf_Internal_Rela *irel = &internal_relocs[i];
6177 bfd_boolean is_reachable;
6179 if (!is_resolvable_asm_expansion (abfd, sec, contents, irel, link_info,
6185 Elf_Internal_Rela *l32r_irel;
6187 asection *target_sec;
6188 xtensa_relax_info *target_relax_info;
6190 /* Mark the source_reloc for the L32R so that it will be
6191 removed in compute_removed_literals(), along with the
6192 associated literal. */
6193 l32r_irel = find_associated_l32r_irel (abfd, sec, contents,
6194 irel, internal_relocs);
6195 if (l32r_irel == NULL)
6198 r_reloc_init (&r_rel, abfd, l32r_irel, contents, sec_size);
6200 target_sec = r_reloc_get_section (&r_rel);
6201 target_relax_info = get_xtensa_relax_info (target_sec);
6203 if (target_relax_info
6204 && (target_relax_info->is_relaxable_literal_section
6205 || target_relax_info->is_relaxable_asm_section))
6207 source_reloc *s_reloc;
6209 /* Search the source_relocs for the entry corresponding to
6210 the l32r_irel. Note: The src_relocs array is not yet
6211 sorted, but it wouldn't matter anyway because we're
6212 searching by source offset instead of target offset. */
6213 s_reloc = find_source_reloc (target_relax_info->src_relocs,
6214 target_relax_info->src_next,
6216 BFD_ASSERT (s_reloc);
6217 s_reloc->is_null = TRUE;
6220 /* Convert this reloc to ASM_SIMPLIFY. */
6221 irel->r_info = ELF32_R_INFO (ELF32_R_SYM (irel->r_info),
6222 R_XTENSA_ASM_SIMPLIFY);
6223 l32r_irel->r_info = ELF32_R_INFO (0, R_XTENSA_NONE);
6225 pin_internal_relocs (sec, internal_relocs);
6229 /* It is resolvable but doesn't reach. We resolve now
6230 by eliminating the relocation -- the call will remain
6231 expanded into L32R/CALLX. */
6232 irel->r_info = ELF32_R_INFO (0, R_XTENSA_NONE);
6233 pin_internal_relocs (sec, internal_relocs);
6238 release_contents (sec, contents);
6239 release_internal_relocs (sec, internal_relocs);
6244 /* Return TRUE if the asm expansion can be resolved. Generally it can
6245 be resolved on a final link or when a partial link locates it in the
6246 same section as the target. Set "is_reachable" flag if the target of
6247 the call is within the range of a direct call, given the current VMA
6248 for this section and the target section. */
6251 is_resolvable_asm_expansion (bfd *abfd,
6254 Elf_Internal_Rela *irel,
6255 struct bfd_link_info *link_info,
6256 bfd_boolean *is_reachable_p)
6258 asection *target_sec;
6259 bfd_vma target_offset;
6261 xtensa_opcode opcode, direct_call_opcode;
6262 bfd_vma self_address;
6263 bfd_vma dest_address;
6264 bfd_boolean uses_l32r;
6265 bfd_size_type sec_size;
6267 *is_reachable_p = FALSE;
6269 if (contents == NULL)
6272 if (ELF32_R_TYPE (irel->r_info) != R_XTENSA_ASM_EXPAND)
6275 sec_size = bfd_get_section_limit (abfd, sec);
6276 opcode = get_expanded_call_opcode (contents + irel->r_offset,
6277 sec_size - irel->r_offset, &uses_l32r);
6278 /* Optimization of longcalls that use CONST16 is not yet implemented. */
6282 direct_call_opcode = swap_callx_for_call_opcode (opcode);
6283 if (direct_call_opcode == XTENSA_UNDEFINED)
6286 /* Check and see that the target resolves. */
6287 r_reloc_init (&r_rel, abfd, irel, contents, sec_size);
6288 if (!r_reloc_is_defined (&r_rel))
6291 target_sec = r_reloc_get_section (&r_rel);
6292 target_offset = r_rel.target_offset;
6294 /* If the target is in a shared library, then it doesn't reach. This
6295 isn't supposed to come up because the compiler should never generate
6296 non-PIC calls on systems that use shared libraries, but the linker
6297 shouldn't crash regardless. */
6298 if (!target_sec->output_section)
6301 /* For relocatable sections, we can only simplify when the output
6302 section of the target is the same as the output section of the
6304 if (link_info->relocatable
6305 && (target_sec->output_section != sec->output_section
6306 || is_reloc_sym_weak (abfd, irel)))
6309 self_address = (sec->output_section->vma
6310 + sec->output_offset + irel->r_offset + 3);
6311 dest_address = (target_sec->output_section->vma
6312 + target_sec->output_offset + target_offset);
6314 *is_reachable_p = pcrel_reloc_fits (direct_call_opcode, 0,
6315 self_address, dest_address);
6317 if ((self_address >> CALL_SEGMENT_BITS) !=
6318 (dest_address >> CALL_SEGMENT_BITS))
6325 static Elf_Internal_Rela *
6326 find_associated_l32r_irel (bfd *abfd,
6329 Elf_Internal_Rela *other_irel,
6330 Elf_Internal_Rela *internal_relocs)
6334 for (i = 0; i < sec->reloc_count; i++)
6336 Elf_Internal_Rela *irel = &internal_relocs[i];
6338 if (irel == other_irel)
6340 if (irel->r_offset != other_irel->r_offset)
6342 if (is_l32r_relocation (abfd, sec, contents, irel))
6350 static xtensa_opcode *
6351 build_reloc_opcodes (bfd *abfd,
6354 Elf_Internal_Rela *internal_relocs)
6357 xtensa_opcode *reloc_opcodes =
6358 (xtensa_opcode *) bfd_malloc (sizeof (xtensa_opcode) * sec->reloc_count);
6359 for (i = 0; i < sec->reloc_count; i++)
6361 Elf_Internal_Rela *irel = &internal_relocs[i];
6362 reloc_opcodes[i] = get_relocation_opcode (abfd, sec, contents, irel);
6364 return reloc_opcodes;
6368 /* The compute_text_actions function will build a list of potential
6369 transformation actions for code in the extended basic block of each
6370 longcall that is optimized to a direct call. From this list we
6371 generate a set of actions to actually perform that optimizes for
6372 space and, if not using size_opt, maintains branch target
6375 These actions to be performed are placed on a per-section list.
6376 The actual changes are performed by relax_section() in the second
6380 compute_text_actions (bfd *abfd,
6382 struct bfd_link_info *link_info)
6384 xtensa_opcode *reloc_opcodes = NULL;
6385 xtensa_relax_info *relax_info;
6387 Elf_Internal_Rela *internal_relocs;
6388 bfd_boolean ok = TRUE;
6390 property_table_entry *prop_table = 0;
6392 bfd_size_type sec_size;
6394 relax_info = get_xtensa_relax_info (sec);
6395 BFD_ASSERT (relax_info);
6396 BFD_ASSERT (relax_info->src_next == relax_info->src_count);
6398 /* Do nothing if the section contains no optimized longcalls. */
6399 if (!relax_info->is_relaxable_asm_section)
6402 internal_relocs = retrieve_internal_relocs (abfd, sec,
6403 link_info->keep_memory);
6405 if (internal_relocs)
6406 qsort (internal_relocs, sec->reloc_count, sizeof (Elf_Internal_Rela),
6407 internal_reloc_compare);
6409 sec_size = bfd_get_section_limit (abfd, sec);
6410 contents = retrieve_contents (abfd, sec, link_info->keep_memory);
6411 if (contents == NULL && sec_size != 0)
6417 ptblsize = xtensa_read_table_entries (abfd, sec, &prop_table,
6418 XTENSA_PROP_SEC_NAME, FALSE);
6425 for (i = 0; i < sec->reloc_count; i++)
6427 Elf_Internal_Rela *irel = &internal_relocs[i];
6429 property_table_entry *the_entry;
6432 ebb_constraint ebb_table;
6433 bfd_size_type simplify_size;
6435 if (irel && ELF32_R_TYPE (irel->r_info) != R_XTENSA_ASM_SIMPLIFY)
6437 r_offset = irel->r_offset;
6439 simplify_size = get_asm_simplify_size (contents, sec_size, r_offset);
6440 if (simplify_size == 0)
6442 (*_bfd_error_handler)
6443 (_("%B(%A+0x%lx): could not decode instruction for XTENSA_ASM_SIMPLIFY relocation; possible configuration mismatch"),
6444 sec->owner, sec, r_offset);
6448 /* If the instruction table is not around, then don't do this
6450 the_entry = elf_xtensa_find_property_entry (prop_table, ptblsize,
6451 sec->vma + irel->r_offset);
6452 if (the_entry == NULL || XTENSA_NO_NOP_REMOVAL)
6454 text_action_add (&relax_info->action_list,
6455 ta_convert_longcall, sec, r_offset,
6460 /* If the next longcall happens to be at the same address as an
6461 unreachable section of size 0, then skip forward. */
6462 ptbl_idx = the_entry - prop_table;
6463 while ((the_entry->flags & XTENSA_PROP_UNREACHABLE)
6464 && the_entry->size == 0
6465 && ptbl_idx + 1 < ptblsize
6466 && (prop_table[ptbl_idx + 1].address
6467 == prop_table[ptbl_idx].address))
6473 if (the_entry->flags & XTENSA_PROP_NO_TRANSFORM)
6474 /* NO_REORDER is OK */
6477 init_ebb_constraint (&ebb_table);
6478 ebb = &ebb_table.ebb;
6479 init_ebb (ebb, sec, contents, sec_size, prop_table, ptblsize,
6480 internal_relocs, sec->reloc_count);
6481 ebb->start_offset = r_offset + simplify_size;
6482 ebb->end_offset = r_offset + simplify_size;
6483 ebb->start_ptbl_idx = ptbl_idx;
6484 ebb->end_ptbl_idx = ptbl_idx;
6485 ebb->start_reloc_idx = i;
6486 ebb->end_reloc_idx = i;
6488 /* Precompute the opcode for each relocation. */
6489 if (reloc_opcodes == NULL)
6490 reloc_opcodes = build_reloc_opcodes (abfd, sec, contents,
6493 if (!extend_ebb_bounds (ebb)
6494 || !compute_ebb_proposed_actions (&ebb_table)
6495 || !compute_ebb_actions (&ebb_table)
6496 || !check_section_ebb_pcrels_fit (abfd, sec, contents,
6497 internal_relocs, &ebb_table,
6499 || !check_section_ebb_reduces (&ebb_table))
6501 /* If anything goes wrong or we get unlucky and something does
6502 not fit, with our plan because of expansion between
6503 critical branches, just convert to a NOP. */
6505 text_action_add (&relax_info->action_list,
6506 ta_convert_longcall, sec, r_offset, 0);
6507 i = ebb_table.ebb.end_reloc_idx;
6508 free_ebb_constraint (&ebb_table);
6512 text_action_add_proposed (&relax_info->action_list, &ebb_table, sec);
6514 /* Update the index so we do not go looking at the relocations
6515 we have already processed. */
6516 i = ebb_table.ebb.end_reloc_idx;
6517 free_ebb_constraint (&ebb_table);
6521 if (relax_info->action_list.head)
6522 print_action_list (stderr, &relax_info->action_list);
6526 release_contents (sec, contents);
6527 release_internal_relocs (sec, internal_relocs);
6531 free (reloc_opcodes);
6537 /* Do not widen an instruction if it is preceeded by a
6538 loop opcode. It might cause misalignment. */
6541 prev_instr_is_a_loop (bfd_byte *contents,
6542 bfd_size_type content_length,
6543 bfd_size_type offset)
6545 xtensa_opcode prev_opcode;
6549 prev_opcode = insn_decode_opcode (contents, content_length, offset-3, 0);
6550 return (xtensa_opcode_is_loop (xtensa_default_isa, prev_opcode) == 1);
6554 /* Find all of the possible actions for an extended basic block. */
6557 compute_ebb_proposed_actions (ebb_constraint *ebb_table)
6559 const ebb_t *ebb = &ebb_table->ebb;
6560 unsigned rel_idx = ebb->start_reloc_idx;
6561 property_table_entry *entry, *start_entry, *end_entry;
6563 xtensa_isa isa = xtensa_default_isa;
6565 static xtensa_insnbuf insnbuf = NULL;
6566 static xtensa_insnbuf slotbuf = NULL;
6568 if (insnbuf == NULL)
6570 insnbuf = xtensa_insnbuf_alloc (isa);
6571 slotbuf = xtensa_insnbuf_alloc (isa);
6574 start_entry = &ebb->ptbl[ebb->start_ptbl_idx];
6575 end_entry = &ebb->ptbl[ebb->end_ptbl_idx];
6577 for (entry = start_entry; entry <= end_entry; entry++)
6579 bfd_vma start_offset, end_offset;
6580 bfd_size_type insn_len;
6582 start_offset = entry->address - ebb->sec->vma;
6583 end_offset = entry->address + entry->size - ebb->sec->vma;
6585 if (entry == start_entry)
6586 start_offset = ebb->start_offset;
6587 if (entry == end_entry)
6588 end_offset = ebb->end_offset;
6589 offset = start_offset;
6591 if (offset == entry->address - ebb->sec->vma
6592 && (entry->flags & XTENSA_PROP_INSN_BRANCH_TARGET) != 0)
6594 enum ebb_target_enum align_type = EBB_DESIRE_TGT_ALIGN;
6595 BFD_ASSERT (offset != end_offset);
6596 if (offset == end_offset)
6599 insn_len = insn_decode_len (ebb->contents, ebb->content_length,
6604 if (check_branch_target_aligned_address (offset, insn_len))
6605 align_type = EBB_REQUIRE_TGT_ALIGN;
6607 ebb_propose_action (ebb_table, align_type, 0,
6608 ta_none, offset, 0, TRUE);
6611 while (offset != end_offset)
6613 Elf_Internal_Rela *irel;
6614 xtensa_opcode opcode;
6616 while (rel_idx < ebb->end_reloc_idx
6617 && (ebb->relocs[rel_idx].r_offset < offset
6618 || (ebb->relocs[rel_idx].r_offset == offset
6619 && (ELF32_R_TYPE (ebb->relocs[rel_idx].r_info)
6620 != R_XTENSA_ASM_SIMPLIFY))))
6623 /* Check for longcall. */
6624 irel = &ebb->relocs[rel_idx];
6625 if (irel->r_offset == offset
6626 && ELF32_R_TYPE (irel->r_info) == R_XTENSA_ASM_SIMPLIFY)
6628 bfd_size_type simplify_size;
6630 simplify_size = get_asm_simplify_size (ebb->contents,
6631 ebb->content_length,
6633 if (simplify_size == 0)
6636 ebb_propose_action (ebb_table, EBB_NO_ALIGN, 0,
6637 ta_convert_longcall, offset, 0, TRUE);
6639 offset += simplify_size;
6643 if (offset + MIN_INSN_LENGTH > ebb->content_length)
6645 xtensa_insnbuf_from_chars (isa, insnbuf, &ebb->contents[offset],
6646 ebb->content_length - offset);
6647 fmt = xtensa_format_decode (isa, insnbuf);
6648 if (fmt == XTENSA_UNDEFINED)
6650 insn_len = xtensa_format_length (isa, fmt);
6651 if (insn_len == (bfd_size_type) XTENSA_UNDEFINED)
6654 if (xtensa_format_num_slots (isa, fmt) != 1)
6660 xtensa_format_get_slot (isa, fmt, 0, insnbuf, slotbuf);
6661 opcode = xtensa_opcode_decode (isa, fmt, 0, slotbuf);
6662 if (opcode == XTENSA_UNDEFINED)
6665 if ((entry->flags & XTENSA_PROP_INSN_NO_DENSITY) == 0
6666 && (entry->flags & XTENSA_PROP_NO_TRANSFORM) == 0
6667 && can_narrow_instruction (slotbuf, fmt, opcode) != 0)
6669 /* Add an instruction narrow action. */
6670 ebb_propose_action (ebb_table, EBB_NO_ALIGN, 0,
6671 ta_narrow_insn, offset, 0, FALSE);
6673 else if ((entry->flags & XTENSA_PROP_NO_TRANSFORM) == 0
6674 && can_widen_instruction (slotbuf, fmt, opcode) != 0
6675 && ! prev_instr_is_a_loop (ebb->contents,
6676 ebb->content_length, offset))
6678 /* Add an instruction widen action. */
6679 ebb_propose_action (ebb_table, EBB_NO_ALIGN, 0,
6680 ta_widen_insn, offset, 0, FALSE);
6682 else if (xtensa_opcode_is_loop (xtensa_default_isa, opcode) == 1)
6684 /* Check for branch targets. */
6685 ebb_propose_action (ebb_table, EBB_REQUIRE_LOOP_ALIGN, 0,
6686 ta_none, offset, 0, TRUE);
6693 if (ebb->ends_unreachable)
6695 ebb_propose_action (ebb_table, EBB_NO_ALIGN, 0,
6696 ta_fill, ebb->end_offset, 0, TRUE);
6702 (*_bfd_error_handler)
6703 (_("%B(%A+0x%lx): could not decode instruction; possible configuration mismatch"),
6704 ebb->sec->owner, ebb->sec, offset);
6709 /* After all of the information has collected about the
6710 transformations possible in an EBB, compute the appropriate actions
6711 here in compute_ebb_actions. We still must check later to make
6712 sure that the actions do not break any relocations. The algorithm
6713 used here is pretty greedy. Basically, it removes as many no-ops
6714 as possible so that the end of the EBB has the same alignment
6715 characteristics as the original. First, it uses narrowing, then
6716 fill space at the end of the EBB, and finally widenings. If that
6717 does not work, it tries again with one fewer no-op removed. The
6718 optimization will only be performed if all of the branch targets
6719 that were aligned before transformation are also aligned after the
6722 When the size_opt flag is set, ignore the branch target alignments,
6723 narrow all wide instructions, and remove all no-ops unless the end
6724 of the EBB prevents it. */
6727 compute_ebb_actions (ebb_constraint *ebb_table)
6731 int removed_bytes = 0;
6732 ebb_t *ebb = &ebb_table->ebb;
6733 unsigned seg_idx_start = 0;
6734 unsigned seg_idx_end = 0;
6736 /* We perform this like the assembler relaxation algorithm: Start by
6737 assuming all instructions are narrow and all no-ops removed; then
6740 /* For each segment of this that has a solid constraint, check to
6741 see if there are any combinations that will keep the constraint.
6743 for (seg_idx_end = 0; seg_idx_end < ebb_table->action_count; seg_idx_end++)
6745 bfd_boolean requires_text_end_align = FALSE;
6746 unsigned longcall_count = 0;
6747 unsigned longcall_convert_count = 0;
6748 unsigned narrowable_count = 0;
6749 unsigned narrowable_convert_count = 0;
6750 unsigned widenable_count = 0;
6751 unsigned widenable_convert_count = 0;
6753 proposed_action *action = NULL;
6754 int align = (1 << ebb_table->ebb.sec->alignment_power);
6756 seg_idx_start = seg_idx_end;
6758 for (i = seg_idx_start; i < ebb_table->action_count; i++)
6760 action = &ebb_table->actions[i];
6761 if (action->action == ta_convert_longcall)
6763 if (action->action == ta_narrow_insn)
6765 if (action->action == ta_widen_insn)
6767 if (action->action == ta_fill)
6769 if (action->align_type == EBB_REQUIRE_LOOP_ALIGN)
6771 if (action->align_type == EBB_REQUIRE_TGT_ALIGN
6772 && !elf32xtensa_size_opt)
6777 if (seg_idx_end == ebb_table->action_count && !ebb->ends_unreachable)
6778 requires_text_end_align = TRUE;
6780 if (elf32xtensa_size_opt && !requires_text_end_align
6781 && action->align_type != EBB_REQUIRE_LOOP_ALIGN
6782 && action->align_type != EBB_REQUIRE_TGT_ALIGN)
6784 longcall_convert_count = longcall_count;
6785 narrowable_convert_count = narrowable_count;
6786 widenable_convert_count = 0;
6790 /* There is a constraint. Convert the max number of longcalls. */
6791 narrowable_convert_count = 0;
6792 longcall_convert_count = 0;
6793 widenable_convert_count = 0;
6795 for (j = 0; j < longcall_count; j++)
6797 int removed = (longcall_count - j) * 3 & (align - 1);
6798 unsigned desire_narrow = (align - removed) & (align - 1);
6799 unsigned desire_widen = removed;
6800 if (desire_narrow <= narrowable_count)
6802 narrowable_convert_count = desire_narrow;
6803 narrowable_convert_count +=
6804 (align * ((narrowable_count - narrowable_convert_count)
6806 longcall_convert_count = (longcall_count - j);
6807 widenable_convert_count = 0;
6810 if (desire_widen <= widenable_count && !elf32xtensa_size_opt)
6812 narrowable_convert_count = 0;
6813 longcall_convert_count = longcall_count - j;
6814 widenable_convert_count = desire_widen;
6820 /* Now the number of conversions are saved. Do them. */
6821 for (i = seg_idx_start; i < seg_idx_end; i++)
6823 action = &ebb_table->actions[i];
6824 switch (action->action)
6826 case ta_convert_longcall:
6827 if (longcall_convert_count != 0)
6829 action->action = ta_remove_longcall;
6830 action->do_action = TRUE;
6831 action->removed_bytes += 3;
6832 longcall_convert_count--;
6835 case ta_narrow_insn:
6836 if (narrowable_convert_count != 0)
6838 action->do_action = TRUE;
6839 action->removed_bytes += 1;
6840 narrowable_convert_count--;
6844 if (widenable_convert_count != 0)
6846 action->do_action = TRUE;
6847 action->removed_bytes -= 1;
6848 widenable_convert_count--;
6857 /* Now we move on to some local opts. Try to remove each of the
6858 remaining longcalls. */
6860 if (ebb_table->ebb.ends_section || ebb_table->ebb.ends_unreachable)
6863 for (i = 0; i < ebb_table->action_count; i++)
6865 int old_removed_bytes = removed_bytes;
6866 proposed_action *action = &ebb_table->actions[i];
6868 if (action->do_action && action->action == ta_convert_longcall)
6870 bfd_boolean bad_alignment = FALSE;
6872 for (j = i + 1; j < ebb_table->action_count; j++)
6874 proposed_action *new_action = &ebb_table->actions[j];
6875 bfd_vma offset = new_action->offset;
6876 if (new_action->align_type == EBB_REQUIRE_TGT_ALIGN)
6878 if (!check_branch_target_aligned
6879 (ebb_table->ebb.contents,
6880 ebb_table->ebb.content_length,
6881 offset, offset - removed_bytes))
6883 bad_alignment = TRUE;
6887 if (new_action->align_type == EBB_REQUIRE_LOOP_ALIGN)
6889 if (!check_loop_aligned (ebb_table->ebb.contents,
6890 ebb_table->ebb.content_length,
6892 offset - removed_bytes))
6894 bad_alignment = TRUE;
6898 if (new_action->action == ta_narrow_insn
6899 && !new_action->do_action
6900 && ebb_table->ebb.sec->alignment_power == 2)
6902 /* Narrow an instruction and we are done. */
6903 new_action->do_action = TRUE;
6904 new_action->removed_bytes += 1;
6905 bad_alignment = FALSE;
6908 if (new_action->action == ta_widen_insn
6909 && new_action->do_action
6910 && ebb_table->ebb.sec->alignment_power == 2)
6912 /* Narrow an instruction and we are done. */
6913 new_action->do_action = FALSE;
6914 new_action->removed_bytes += 1;
6915 bad_alignment = FALSE;
6918 if (new_action->do_action)
6919 removed_bytes += new_action->removed_bytes;
6923 action->removed_bytes += 3;
6924 action->action = ta_remove_longcall;
6925 action->do_action = TRUE;
6928 removed_bytes = old_removed_bytes;
6929 if (action->do_action)
6930 removed_bytes += action->removed_bytes;
6935 for (i = 0; i < ebb_table->action_count; ++i)
6937 proposed_action *action = &ebb_table->actions[i];
6938 if (action->do_action)
6939 removed_bytes += action->removed_bytes;
6942 if ((removed_bytes % (1 << ebb_table->ebb.sec->alignment_power)) != 0
6943 && ebb->ends_unreachable)
6945 proposed_action *action;
6949 BFD_ASSERT (ebb_table->action_count != 0);
6950 action = &ebb_table->actions[ebb_table->action_count - 1];
6951 BFD_ASSERT (action->action == ta_fill);
6952 BFD_ASSERT (ebb->ends_unreachable->flags & XTENSA_PROP_UNREACHABLE);
6954 extra_space = compute_fill_extra_space (ebb->ends_unreachable);
6955 br = action->removed_bytes + removed_bytes + extra_space;
6956 br = br & ((1 << ebb->sec->alignment_power ) - 1);
6958 action->removed_bytes = extra_space - br;
6964 /* The xlate_map is a sorted array of address mappings designed to
6965 answer the offset_with_removed_text() query with a binary search instead
6966 of a linear search through the section's action_list. */
6968 typedef struct xlate_map_entry xlate_map_entry_t;
6969 typedef struct xlate_map xlate_map_t;
6971 struct xlate_map_entry
6973 unsigned orig_address;
6974 unsigned new_address;
6980 unsigned entry_count;
6981 xlate_map_entry_t *entry;
6986 xlate_compare (const void *a_v, const void *b_v)
6988 const xlate_map_entry_t *a = (const xlate_map_entry_t *) a_v;
6989 const xlate_map_entry_t *b = (const xlate_map_entry_t *) b_v;
6990 if (a->orig_address < b->orig_address)
6992 if (a->orig_address > (b->orig_address + b->size - 1))
6999 xlate_offset_with_removed_text (const xlate_map_t *map,
7000 text_action_list *action_list,
7003 xlate_map_entry_t tmp;
7005 xlate_map_entry_t *e;
7008 return offset_with_removed_text (action_list, offset);
7010 if (map->entry_count == 0)
7013 tmp.orig_address = offset;
7014 tmp.new_address = offset;
7017 r = bsearch (&offset, map->entry, map->entry_count,
7018 sizeof (xlate_map_entry_t), &xlate_compare);
7019 e = (xlate_map_entry_t *) r;
7021 BFD_ASSERT (e != NULL);
7024 return e->new_address - e->orig_address + offset;
7028 /* Build a binary searchable offset translation map from a section's
7031 static xlate_map_t *
7032 build_xlate_map (asection *sec, xtensa_relax_info *relax_info)
7034 xlate_map_t *map = (xlate_map_t *) bfd_malloc (sizeof (xlate_map_t));
7035 text_action_list *action_list = &relax_info->action_list;
7036 unsigned num_actions = 0;
7039 xlate_map_entry_t *current_entry;
7044 num_actions = action_list_count (action_list);
7045 map->entry = (xlate_map_entry_t *)
7046 bfd_malloc (sizeof (xlate_map_entry_t) * (num_actions + 1));
7047 if (map->entry == NULL)
7052 map->entry_count = 0;
7055 current_entry = &map->entry[0];
7057 current_entry->orig_address = 0;
7058 current_entry->new_address = 0;
7059 current_entry->size = 0;
7061 for (r = action_list->head; r != NULL; r = r->next)
7063 unsigned orig_size = 0;
7067 case ta_remove_insn:
7068 case ta_convert_longcall:
7069 case ta_remove_literal:
7070 case ta_add_literal:
7072 case ta_remove_longcall:
7075 case ta_narrow_insn:
7084 current_entry->size =
7085 r->offset + orig_size - current_entry->orig_address;
7086 if (current_entry->size != 0)
7091 current_entry->orig_address = r->offset + orig_size;
7092 removed += r->removed_bytes;
7093 current_entry->new_address = r->offset + orig_size - removed;
7094 current_entry->size = 0;
7097 current_entry->size = (bfd_get_section_limit (sec->owner, sec)
7098 - current_entry->orig_address);
7099 if (current_entry->size != 0)
7106 /* Free an offset translation map. */
7109 free_xlate_map (xlate_map_t *map)
7111 if (map && map->entry)
7118 /* Use check_section_ebb_pcrels_fit to make sure that all of the
7119 relocations in a section will fit if a proposed set of actions
7123 check_section_ebb_pcrels_fit (bfd *abfd,
7126 Elf_Internal_Rela *internal_relocs,
7127 const ebb_constraint *constraint,
7128 const xtensa_opcode *reloc_opcodes)
7131 Elf_Internal_Rela *irel;
7132 xlate_map_t *xmap = NULL;
7133 bfd_boolean ok = TRUE;
7134 xtensa_relax_info *relax_info;
7136 relax_info = get_xtensa_relax_info (sec);
7138 if (relax_info && sec->reloc_count > 100)
7140 xmap = build_xlate_map (sec, relax_info);
7141 /* NULL indicates out of memory, but the slow version
7142 can still be used. */
7145 for (i = 0; i < sec->reloc_count; i++)
7148 bfd_vma orig_self_offset, orig_target_offset;
7149 bfd_vma self_offset, target_offset;
7151 reloc_howto_type *howto;
7152 int self_removed_bytes, target_removed_bytes;
7154 irel = &internal_relocs[i];
7155 r_type = ELF32_R_TYPE (irel->r_info);
7157 howto = &elf_howto_table[r_type];
7158 /* We maintain the required invariant: PC-relative relocations
7159 that fit before linking must fit after linking. Thus we only
7160 need to deal with relocations to the same section that are
7162 if (r_type == R_XTENSA_ASM_SIMPLIFY
7163 || r_type == R_XTENSA_32_PCREL
7164 || !howto->pc_relative)
7167 r_reloc_init (&r_rel, abfd, irel, contents,
7168 bfd_get_section_limit (abfd, sec));
7170 if (r_reloc_get_section (&r_rel) != sec)
7173 orig_self_offset = irel->r_offset;
7174 orig_target_offset = r_rel.target_offset;
7176 self_offset = orig_self_offset;
7177 target_offset = orig_target_offset;
7182 xlate_offset_with_removed_text (xmap, &relax_info->action_list,
7185 xlate_offset_with_removed_text (xmap, &relax_info->action_list,
7186 orig_target_offset);
7189 self_removed_bytes = 0;
7190 target_removed_bytes = 0;
7192 for (j = 0; j < constraint->action_count; ++j)
7194 proposed_action *action = &constraint->actions[j];
7195 bfd_vma offset = action->offset;
7196 int removed_bytes = action->removed_bytes;
7197 if (offset < orig_self_offset
7198 || (offset == orig_self_offset && action->action == ta_fill
7199 && action->removed_bytes < 0))
7200 self_removed_bytes += removed_bytes;
7201 if (offset < orig_target_offset
7202 || (offset == orig_target_offset && action->action == ta_fill
7203 && action->removed_bytes < 0))
7204 target_removed_bytes += removed_bytes;
7206 self_offset -= self_removed_bytes;
7207 target_offset -= target_removed_bytes;
7209 /* Try to encode it. Get the operand and check. */
7210 if (is_alt_relocation (ELF32_R_TYPE (irel->r_info)))
7212 /* None of the current alternate relocs are PC-relative,
7213 and only PC-relative relocs matter here. */
7217 xtensa_opcode opcode;
7221 opcode = reloc_opcodes[i];
7223 opcode = get_relocation_opcode (abfd, sec, contents, irel);
7224 if (opcode == XTENSA_UNDEFINED)
7230 opnum = get_relocation_opnd (opcode, ELF32_R_TYPE (irel->r_info));
7231 if (opnum == XTENSA_UNDEFINED)
7237 if (!pcrel_reloc_fits (opcode, opnum, self_offset, target_offset))
7246 free_xlate_map (xmap);
7253 check_section_ebb_reduces (const ebb_constraint *constraint)
7258 for (i = 0; i < constraint->action_count; i++)
7260 const proposed_action *action = &constraint->actions[i];
7261 if (action->do_action)
7262 removed += action->removed_bytes;
7272 text_action_add_proposed (text_action_list *l,
7273 const ebb_constraint *ebb_table,
7278 for (i = 0; i < ebb_table->action_count; i++)
7280 proposed_action *action = &ebb_table->actions[i];
7282 if (!action->do_action)
7284 switch (action->action)
7286 case ta_remove_insn:
7287 case ta_remove_longcall:
7288 case ta_convert_longcall:
7289 case ta_narrow_insn:
7292 case ta_remove_literal:
7293 text_action_add (l, action->action, sec, action->offset,
7294 action->removed_bytes);
7307 compute_fill_extra_space (property_table_entry *entry)
7309 int fill_extra_space;
7314 if ((entry->flags & XTENSA_PROP_UNREACHABLE) == 0)
7317 fill_extra_space = entry->size;
7318 if ((entry->flags & XTENSA_PROP_ALIGN) != 0)
7320 /* Fill bytes for alignment:
7321 (2**n)-1 - (addr + (2**n)-1) & (2**n -1) */
7322 int pow = GET_XTENSA_PROP_ALIGNMENT (entry->flags);
7323 int nsm = (1 << pow) - 1;
7324 bfd_vma addr = entry->address + entry->size;
7325 bfd_vma align_fill = nsm - ((addr + nsm) & nsm);
7326 fill_extra_space += align_fill;
7328 return fill_extra_space;
7332 /* First relaxation pass. */
7334 /* If the section contains relaxable literals, check each literal to
7335 see if it has the same value as another literal that has already
7336 been seen, either in the current section or a previous one. If so,
7337 add an entry to the per-section list of removed literals. The
7338 actual changes are deferred until the next pass. */
7341 compute_removed_literals (bfd *abfd,
7343 struct bfd_link_info *link_info,
7344 value_map_hash_table *values)
7346 xtensa_relax_info *relax_info;
7348 Elf_Internal_Rela *internal_relocs;
7349 source_reloc *src_relocs, *rel;
7350 bfd_boolean ok = TRUE;
7351 property_table_entry *prop_table = NULL;
7354 bfd_boolean last_loc_is_prev = FALSE;
7355 bfd_vma last_target_offset = 0;
7356 section_cache_t target_sec_cache;
7357 bfd_size_type sec_size;
7359 init_section_cache (&target_sec_cache);
7361 /* Do nothing if it is not a relaxable literal section. */
7362 relax_info = get_xtensa_relax_info (sec);
7363 BFD_ASSERT (relax_info);
7364 if (!relax_info->is_relaxable_literal_section)
7367 internal_relocs = retrieve_internal_relocs (abfd, sec,
7368 link_info->keep_memory);
7370 sec_size = bfd_get_section_limit (abfd, sec);
7371 contents = retrieve_contents (abfd, sec, link_info->keep_memory);
7372 if (contents == NULL && sec_size != 0)
7378 /* Sort the source_relocs by target offset. */
7379 src_relocs = relax_info->src_relocs;
7380 qsort (src_relocs, relax_info->src_count,
7381 sizeof (source_reloc), source_reloc_compare);
7382 qsort (internal_relocs, sec->reloc_count, sizeof (Elf_Internal_Rela),
7383 internal_reloc_compare);
7385 ptblsize = xtensa_read_table_entries (abfd, sec, &prop_table,
7386 XTENSA_PROP_SEC_NAME, FALSE);
7394 for (i = 0; i < relax_info->src_count; i++)
7396 Elf_Internal_Rela *irel = NULL;
7398 rel = &src_relocs[i];
7399 if (get_l32r_opcode () != rel->opcode)
7401 irel = get_irel_at_offset (sec, internal_relocs,
7402 rel->r_rel.target_offset);
7404 /* If the relocation on this is not a simple R_XTENSA_32 or
7405 R_XTENSA_PLT then do not consider it. This may happen when
7406 the difference of two symbols is used in a literal. */
7407 if (irel && (ELF32_R_TYPE (irel->r_info) != R_XTENSA_32
7408 && ELF32_R_TYPE (irel->r_info) != R_XTENSA_PLT))
7411 /* If the target_offset for this relocation is the same as the
7412 previous relocation, then we've already considered whether the
7413 literal can be coalesced. Skip to the next one.... */
7414 if (i != 0 && prev_i != -1
7415 && src_relocs[i-1].r_rel.target_offset == rel->r_rel.target_offset)
7419 if (last_loc_is_prev &&
7420 last_target_offset + 4 != rel->r_rel.target_offset)
7421 last_loc_is_prev = FALSE;
7423 /* Check if the relocation was from an L32R that is being removed
7424 because a CALLX was converted to a direct CALL, and check if
7425 there are no other relocations to the literal. */
7426 if (is_removable_literal (rel, i, src_relocs, relax_info->src_count,
7427 sec, prop_table, ptblsize))
7429 if (!remove_dead_literal (abfd, sec, link_info, internal_relocs,
7430 irel, rel, prop_table, ptblsize))
7435 last_target_offset = rel->r_rel.target_offset;
7439 if (!identify_literal_placement (abfd, sec, contents, link_info,
7441 &last_loc_is_prev, irel,
7442 relax_info->src_count - i, rel,
7443 prop_table, ptblsize,
7444 &target_sec_cache, rel->is_abs_literal))
7449 last_target_offset = rel->r_rel.target_offset;
7453 print_removed_literals (stderr, &relax_info->removed_list);
7454 print_action_list (stderr, &relax_info->action_list);
7458 if (prop_table) free (prop_table);
7459 clear_section_cache (&target_sec_cache);
7461 release_contents (sec, contents);
7462 release_internal_relocs (sec, internal_relocs);
7467 static Elf_Internal_Rela *
7468 get_irel_at_offset (asection *sec,
7469 Elf_Internal_Rela *internal_relocs,
7473 Elf_Internal_Rela *irel;
7475 Elf_Internal_Rela key;
7477 if (!internal_relocs)
7480 key.r_offset = offset;
7481 irel = bsearch (&key, internal_relocs, sec->reloc_count,
7482 sizeof (Elf_Internal_Rela), internal_reloc_matches);
7486 /* bsearch does not guarantee which will be returned if there are
7487 multiple matches. We need the first that is not an alignment. */
7488 i = irel - internal_relocs;
7491 if (internal_relocs[i-1].r_offset != offset)
7495 for ( ; i < sec->reloc_count; i++)
7497 irel = &internal_relocs[i];
7498 r_type = ELF32_R_TYPE (irel->r_info);
7499 if (irel->r_offset == offset && r_type != R_XTENSA_NONE)
7508 is_removable_literal (const source_reloc *rel,
7510 const source_reloc *src_relocs,
7513 property_table_entry *prop_table,
7516 const source_reloc *curr_rel;
7517 property_table_entry *entry;
7522 entry = elf_xtensa_find_property_entry (prop_table, ptblsize,
7523 sec->vma + rel->r_rel.target_offset);
7524 if (entry && (entry->flags & XTENSA_PROP_NO_TRANSFORM))
7527 for (++i; i < src_count; ++i)
7529 curr_rel = &src_relocs[i];
7530 /* If all others have the same target offset.... */
7531 if (curr_rel->r_rel.target_offset != rel->r_rel.target_offset)
7534 if (!curr_rel->is_null
7535 && !xtensa_is_property_section (curr_rel->source_sec)
7536 && !(curr_rel->source_sec->flags & SEC_DEBUGGING))
7544 remove_dead_literal (bfd *abfd,
7546 struct bfd_link_info *link_info,
7547 Elf_Internal_Rela *internal_relocs,
7548 Elf_Internal_Rela *irel,
7550 property_table_entry *prop_table,
7553 property_table_entry *entry;
7554 xtensa_relax_info *relax_info;
7556 relax_info = get_xtensa_relax_info (sec);
7560 entry = elf_xtensa_find_property_entry (prop_table, ptblsize,
7561 sec->vma + rel->r_rel.target_offset);
7563 /* Mark the unused literal so that it will be removed. */
7564 add_removed_literal (&relax_info->removed_list, &rel->r_rel, NULL);
7566 text_action_add (&relax_info->action_list,
7567 ta_remove_literal, sec, rel->r_rel.target_offset, 4);
7569 /* If the section is 4-byte aligned, do not add fill. */
7570 if (sec->alignment_power > 2)
7572 int fill_extra_space;
7573 bfd_vma entry_sec_offset;
7575 property_table_entry *the_add_entry;
7579 entry_sec_offset = entry->address - sec->vma + entry->size;
7581 entry_sec_offset = rel->r_rel.target_offset + 4;
7583 /* If the literal range is at the end of the section,
7585 the_add_entry = elf_xtensa_find_property_entry (prop_table, ptblsize,
7587 fill_extra_space = compute_fill_extra_space (the_add_entry);
7589 fa = find_fill_action (&relax_info->action_list, sec, entry_sec_offset);
7590 removed_diff = compute_removed_action_diff (fa, sec, entry_sec_offset,
7591 -4, fill_extra_space);
7593 adjust_fill_action (fa, removed_diff);
7595 text_action_add (&relax_info->action_list,
7596 ta_fill, sec, entry_sec_offset, removed_diff);
7599 /* Zero out the relocation on this literal location. */
7602 if (elf_hash_table (link_info)->dynamic_sections_created)
7603 shrink_dynamic_reloc_sections (link_info, abfd, sec, irel);
7605 irel->r_info = ELF32_R_INFO (0, R_XTENSA_NONE);
7606 pin_internal_relocs (sec, internal_relocs);
7609 /* Do not modify "last_loc_is_prev". */
7615 identify_literal_placement (bfd *abfd,
7618 struct bfd_link_info *link_info,
7619 value_map_hash_table *values,
7620 bfd_boolean *last_loc_is_prev_p,
7621 Elf_Internal_Rela *irel,
7622 int remaining_src_rels,
7624 property_table_entry *prop_table,
7626 section_cache_t *target_sec_cache,
7627 bfd_boolean is_abs_literal)
7631 xtensa_relax_info *relax_info;
7632 bfd_boolean literal_placed = FALSE;
7634 unsigned long value;
7635 bfd_boolean final_static_link;
7636 bfd_size_type sec_size;
7638 relax_info = get_xtensa_relax_info (sec);
7642 sec_size = bfd_get_section_limit (abfd, sec);
7645 (!link_info->relocatable
7646 && !elf_hash_table (link_info)->dynamic_sections_created);
7648 /* The placement algorithm first checks to see if the literal is
7649 already in the value map. If so and the value map is reachable
7650 from all uses, then the literal is moved to that location. If
7651 not, then we identify the last location where a fresh literal was
7652 placed. If the literal can be safely moved there, then we do so.
7653 If not, then we assume that the literal is not to move and leave
7654 the literal where it is, marking it as the last literal
7657 /* Find the literal value. */
7659 r_reloc_init (&r_rel, abfd, irel, contents, sec_size);
7662 BFD_ASSERT (rel->r_rel.target_offset < sec_size);
7663 value = bfd_get_32 (abfd, contents + rel->r_rel.target_offset);
7665 init_literal_value (&val, &r_rel, value, is_abs_literal);
7667 /* Check if we've seen another literal with the same value that
7668 is in the same output section. */
7669 val_map = value_map_get_cached_value (values, &val, final_static_link);
7672 && (r_reloc_get_section (&val_map->loc)->output_section
7673 == sec->output_section)
7674 && relocations_reach (rel, remaining_src_rels, &val_map->loc)
7675 && coalesce_shared_literal (sec, rel, prop_table, ptblsize, val_map))
7677 /* No change to last_loc_is_prev. */
7678 literal_placed = TRUE;
7681 /* For relocatable links, do not try to move literals. To do it
7682 correctly might increase the number of relocations in an input
7683 section making the default relocatable linking fail. */
7684 if (!link_info->relocatable && !literal_placed
7685 && values->has_last_loc && !(*last_loc_is_prev_p))
7687 asection *target_sec = r_reloc_get_section (&values->last_loc);
7688 if (target_sec && target_sec->output_section == sec->output_section)
7690 /* Increment the virtual offset. */
7691 r_reloc try_loc = values->last_loc;
7692 try_loc.virtual_offset += 4;
7694 /* There is a last loc that was in the same output section. */
7695 if (relocations_reach (rel, remaining_src_rels, &try_loc)
7696 && move_shared_literal (sec, link_info, rel,
7697 prop_table, ptblsize,
7698 &try_loc, &val, target_sec_cache))
7700 values->last_loc.virtual_offset += 4;
7701 literal_placed = TRUE;
7703 val_map = add_value_map (values, &val, &try_loc,
7706 val_map->loc = try_loc;
7711 if (!literal_placed)
7713 /* Nothing worked, leave the literal alone but update the last loc. */
7714 values->has_last_loc = TRUE;
7715 values->last_loc = rel->r_rel;
7717 val_map = add_value_map (values, &val, &rel->r_rel, final_static_link);
7719 val_map->loc = rel->r_rel;
7720 *last_loc_is_prev_p = TRUE;
7727 /* Check if the original relocations (presumably on L32R instructions)
7728 identified by reloc[0..N] can be changed to reference the literal
7729 identified by r_rel. If r_rel is out of range for any of the
7730 original relocations, then we don't want to coalesce the original
7731 literal with the one at r_rel. We only check reloc[0..N], where the
7732 offsets are all the same as for reloc[0] (i.e., they're all
7733 referencing the same literal) and where N is also bounded by the
7734 number of remaining entries in the "reloc" array. The "reloc" array
7735 is sorted by target offset so we know all the entries for the same
7736 literal will be contiguous. */
7739 relocations_reach (source_reloc *reloc,
7740 int remaining_relocs,
7741 const r_reloc *r_rel)
7743 bfd_vma from_offset, source_address, dest_address;
7747 if (!r_reloc_is_defined (r_rel))
7750 sec = r_reloc_get_section (r_rel);
7751 from_offset = reloc[0].r_rel.target_offset;
7753 for (i = 0; i < remaining_relocs; i++)
7755 if (reloc[i].r_rel.target_offset != from_offset)
7758 /* Ignore relocations that have been removed. */
7759 if (reloc[i].is_null)
7762 /* The original and new output section for these must be the same
7763 in order to coalesce. */
7764 if (r_reloc_get_section (&reloc[i].r_rel)->output_section
7765 != sec->output_section)
7768 /* Absolute literals in the same output section can always be
7770 if (reloc[i].is_abs_literal)
7773 /* A literal with no PC-relative relocations can be moved anywhere. */
7774 if (reloc[i].opnd != -1)
7776 /* Otherwise, check to see that it fits. */
7777 source_address = (reloc[i].source_sec->output_section->vma
7778 + reloc[i].source_sec->output_offset
7779 + reloc[i].r_rel.rela.r_offset);
7780 dest_address = (sec->output_section->vma
7781 + sec->output_offset
7782 + r_rel->target_offset);
7784 if (!pcrel_reloc_fits (reloc[i].opcode, reloc[i].opnd,
7785 source_address, dest_address))
7794 /* Move a literal to another literal location because it is
7795 the same as the other literal value. */
7798 coalesce_shared_literal (asection *sec,
7800 property_table_entry *prop_table,
7804 property_table_entry *entry;
7806 property_table_entry *the_add_entry;
7808 xtensa_relax_info *relax_info;
7810 relax_info = get_xtensa_relax_info (sec);
7814 entry = elf_xtensa_find_property_entry
7815 (prop_table, ptblsize, sec->vma + rel->r_rel.target_offset);
7816 if (entry && (entry->flags & XTENSA_PROP_NO_TRANSFORM))
7819 /* Mark that the literal will be coalesced. */
7820 add_removed_literal (&relax_info->removed_list, &rel->r_rel, &val_map->loc);
7822 text_action_add (&relax_info->action_list,
7823 ta_remove_literal, sec, rel->r_rel.target_offset, 4);
7825 /* If the section is 4-byte aligned, do not add fill. */
7826 if (sec->alignment_power > 2)
7828 int fill_extra_space;
7829 bfd_vma entry_sec_offset;
7832 entry_sec_offset = entry->address - sec->vma + entry->size;
7834 entry_sec_offset = rel->r_rel.target_offset + 4;
7836 /* If the literal range is at the end of the section,
7838 fill_extra_space = 0;
7839 the_add_entry = elf_xtensa_find_property_entry (prop_table, ptblsize,
7841 if (the_add_entry && (the_add_entry->flags & XTENSA_PROP_UNREACHABLE))
7842 fill_extra_space = the_add_entry->size;
7844 fa = find_fill_action (&relax_info->action_list, sec, entry_sec_offset);
7845 removed_diff = compute_removed_action_diff (fa, sec, entry_sec_offset,
7846 -4, fill_extra_space);
7848 adjust_fill_action (fa, removed_diff);
7850 text_action_add (&relax_info->action_list,
7851 ta_fill, sec, entry_sec_offset, removed_diff);
7858 /* Move a literal to another location. This may actually increase the
7859 total amount of space used because of alignments so we need to do
7860 this carefully. Also, it may make a branch go out of range. */
7863 move_shared_literal (asection *sec,
7864 struct bfd_link_info *link_info,
7866 property_table_entry *prop_table,
7868 const r_reloc *target_loc,
7869 const literal_value *lit_value,
7870 section_cache_t *target_sec_cache)
7872 property_table_entry *the_add_entry, *src_entry, *target_entry = NULL;
7873 text_action *fa, *target_fa;
7875 xtensa_relax_info *relax_info, *target_relax_info;
7876 asection *target_sec;
7878 ebb_constraint ebb_table;
7879 bfd_boolean relocs_fit;
7881 /* If this routine always returns FALSE, the literals that cannot be
7882 coalesced will not be moved. */
7883 if (elf32xtensa_no_literal_movement)
7886 relax_info = get_xtensa_relax_info (sec);
7890 target_sec = r_reloc_get_section (target_loc);
7891 target_relax_info = get_xtensa_relax_info (target_sec);
7893 /* Literals to undefined sections may not be moved because they
7894 must report an error. */
7895 if (bfd_is_und_section (target_sec))
7898 src_entry = elf_xtensa_find_property_entry
7899 (prop_table, ptblsize, sec->vma + rel->r_rel.target_offset);
7901 if (!section_cache_section (target_sec_cache, target_sec, link_info))
7904 target_entry = elf_xtensa_find_property_entry
7905 (target_sec_cache->ptbl, target_sec_cache->pte_count,
7906 target_sec->vma + target_loc->target_offset);
7911 /* Make sure that we have not broken any branches. */
7914 init_ebb_constraint (&ebb_table);
7915 ebb = &ebb_table.ebb;
7916 init_ebb (ebb, target_sec_cache->sec, target_sec_cache->contents,
7917 target_sec_cache->content_length,
7918 target_sec_cache->ptbl, target_sec_cache->pte_count,
7919 target_sec_cache->relocs, target_sec_cache->reloc_count);
7921 /* Propose to add 4 bytes + worst-case alignment size increase to
7923 ebb_propose_action (&ebb_table, EBB_NO_ALIGN, 0,
7924 ta_fill, target_loc->target_offset,
7925 -4 - (1 << target_sec->alignment_power), TRUE);
7927 /* Check all of the PC-relative relocations to make sure they still fit. */
7928 relocs_fit = check_section_ebb_pcrels_fit (target_sec->owner, target_sec,
7929 target_sec_cache->contents,
7930 target_sec_cache->relocs,
7936 text_action_add_literal (&target_relax_info->action_list,
7937 ta_add_literal, target_loc, lit_value, -4);
7939 if (target_sec->alignment_power > 2 && target_entry != src_entry)
7941 /* May need to add or remove some fill to maintain alignment. */
7942 int fill_extra_space;
7943 bfd_vma entry_sec_offset;
7946 target_entry->address - target_sec->vma + target_entry->size;
7948 /* If the literal range is at the end of the section,
7950 fill_extra_space = 0;
7952 elf_xtensa_find_property_entry (target_sec_cache->ptbl,
7953 target_sec_cache->pte_count,
7955 if (the_add_entry && (the_add_entry->flags & XTENSA_PROP_UNREACHABLE))
7956 fill_extra_space = the_add_entry->size;
7958 target_fa = find_fill_action (&target_relax_info->action_list,
7959 target_sec, entry_sec_offset);
7960 removed_diff = compute_removed_action_diff (target_fa, target_sec,
7961 entry_sec_offset, 4,
7964 adjust_fill_action (target_fa, removed_diff);
7966 text_action_add (&target_relax_info->action_list,
7967 ta_fill, target_sec, entry_sec_offset, removed_diff);
7970 /* Mark that the literal will be moved to the new location. */
7971 add_removed_literal (&relax_info->removed_list, &rel->r_rel, target_loc);
7973 /* Remove the literal. */
7974 text_action_add (&relax_info->action_list,
7975 ta_remove_literal, sec, rel->r_rel.target_offset, 4);
7977 /* If the section is 4-byte aligned, do not add fill. */
7978 if (sec->alignment_power > 2 && target_entry != src_entry)
7980 int fill_extra_space;
7981 bfd_vma entry_sec_offset;
7984 entry_sec_offset = src_entry->address - sec->vma + src_entry->size;
7986 entry_sec_offset = rel->r_rel.target_offset+4;
7988 /* If the literal range is at the end of the section,
7990 fill_extra_space = 0;
7991 the_add_entry = elf_xtensa_find_property_entry (prop_table, ptblsize,
7993 if (the_add_entry && (the_add_entry->flags & XTENSA_PROP_UNREACHABLE))
7994 fill_extra_space = the_add_entry->size;
7996 fa = find_fill_action (&relax_info->action_list, sec, entry_sec_offset);
7997 removed_diff = compute_removed_action_diff (fa, sec, entry_sec_offset,
7998 -4, fill_extra_space);
8000 adjust_fill_action (fa, removed_diff);
8002 text_action_add (&relax_info->action_list,
8003 ta_fill, sec, entry_sec_offset, removed_diff);
8010 /* Second relaxation pass. */
8012 /* Modify all of the relocations to point to the right spot, and if this
8013 is a relaxable section, delete the unwanted literals and fix the
8017 relax_section (bfd *abfd, asection *sec, struct bfd_link_info *link_info)
8019 Elf_Internal_Rela *internal_relocs;
8020 xtensa_relax_info *relax_info;
8022 bfd_boolean ok = TRUE;
8024 bfd_boolean rv = FALSE;
8025 bfd_boolean virtual_action;
8026 bfd_size_type sec_size;
8028 sec_size = bfd_get_section_limit (abfd, sec);
8029 relax_info = get_xtensa_relax_info (sec);
8030 BFD_ASSERT (relax_info);
8032 /* First translate any of the fixes that have been added already. */
8033 translate_section_fixes (sec);
8035 /* Handle property sections (e.g., literal tables) specially. */
8036 if (xtensa_is_property_section (sec))
8038 BFD_ASSERT (!relax_info->is_relaxable_literal_section);
8039 return relax_property_section (abfd, sec, link_info);
8042 internal_relocs = retrieve_internal_relocs (abfd, sec,
8043 link_info->keep_memory);
8044 contents = retrieve_contents (abfd, sec, link_info->keep_memory);
8045 if (contents == NULL && sec_size != 0)
8051 if (internal_relocs)
8053 for (i = 0; i < sec->reloc_count; i++)
8055 Elf_Internal_Rela *irel;
8056 xtensa_relax_info *target_relax_info;
8057 bfd_vma source_offset, old_source_offset;
8060 asection *target_sec;
8062 /* Locally change the source address.
8063 Translate the target to the new target address.
8064 If it points to this section and has been removed,
8068 irel = &internal_relocs[i];
8069 source_offset = irel->r_offset;
8070 old_source_offset = source_offset;
8072 r_type = ELF32_R_TYPE (irel->r_info);
8073 r_reloc_init (&r_rel, abfd, irel, contents,
8074 bfd_get_section_limit (abfd, sec));
8076 /* If this section could have changed then we may need to
8077 change the relocation's offset. */
8079 if (relax_info->is_relaxable_literal_section
8080 || relax_info->is_relaxable_asm_section)
8082 pin_internal_relocs (sec, internal_relocs);
8084 if (r_type != R_XTENSA_NONE
8085 && find_removed_literal (&relax_info->removed_list,
8088 /* Remove this relocation. */
8089 if (elf_hash_table (link_info)->dynamic_sections_created)
8090 shrink_dynamic_reloc_sections (link_info, abfd, sec, irel);
8091 irel->r_info = ELF32_R_INFO (0, R_XTENSA_NONE);
8092 irel->r_offset = offset_with_removed_text
8093 (&relax_info->action_list, irel->r_offset);
8097 if (r_type == R_XTENSA_ASM_SIMPLIFY)
8099 text_action *action =
8100 find_insn_action (&relax_info->action_list,
8102 if (action && (action->action == ta_convert_longcall
8103 || action->action == ta_remove_longcall))
8105 bfd_reloc_status_type retval;
8106 char *error_message = NULL;
8108 retval = contract_asm_expansion (contents, sec_size,
8109 irel, &error_message);
8110 if (retval != bfd_reloc_ok)
8112 (*link_info->callbacks->reloc_dangerous)
8113 (link_info, error_message, abfd, sec,
8117 /* Update the action so that the code that moves
8118 the contents will do the right thing. */
8119 if (action->action == ta_remove_longcall)
8120 action->action = ta_remove_insn;
8122 action->action = ta_none;
8123 /* Refresh the info in the r_rel. */
8124 r_reloc_init (&r_rel, abfd, irel, contents, sec_size);
8125 r_type = ELF32_R_TYPE (irel->r_info);
8129 source_offset = offset_with_removed_text
8130 (&relax_info->action_list, irel->r_offset);
8131 irel->r_offset = source_offset;
8134 /* If the target section could have changed then
8135 we may need to change the relocation's target offset. */
8137 target_sec = r_reloc_get_section (&r_rel);
8139 /* For a reference to a discarded section from a DWARF section,
8140 i.e., where action_discarded is PRETEND, the symbol will
8141 eventually be modified to refer to the kept section (at least if
8142 the kept and discarded sections are the same size). Anticipate
8143 that here and adjust things accordingly. */
8144 if (! elf_xtensa_ignore_discarded_relocs (sec)
8145 && elf_xtensa_action_discarded (sec) == PRETEND
8146 && sec->sec_info_type != ELF_INFO_TYPE_STABS
8147 && target_sec != NULL
8148 && elf_discarded_section (target_sec))
8150 /* It would be natural to call _bfd_elf_check_kept_section
8151 here, but it's not exported from elflink.c. It's also a
8152 fairly expensive check. Adjusting the relocations to the
8153 discarded section is fairly harmless; it will only adjust
8154 some addends and difference values. If it turns out that
8155 _bfd_elf_check_kept_section fails later, it won't matter,
8156 so just compare the section names to find the right group
8158 asection *kept = target_sec->kept_section;
8161 if ((kept->flags & SEC_GROUP) != 0)
8163 asection *first = elf_next_in_group (kept);
8164 asection *s = first;
8169 if (strcmp (s->name, target_sec->name) == 0)
8174 s = elf_next_in_group (s);
8181 && ((target_sec->rawsize != 0
8182 ? target_sec->rawsize : target_sec->size)
8183 == (kept->rawsize != 0 ? kept->rawsize : kept->size)))
8187 target_relax_info = get_xtensa_relax_info (target_sec);
8188 if (target_relax_info
8189 && (target_relax_info->is_relaxable_literal_section
8190 || target_relax_info->is_relaxable_asm_section))
8193 target_sec = translate_reloc (&r_rel, &new_reloc, target_sec);
8195 if (r_type == R_XTENSA_DIFF8
8196 || r_type == R_XTENSA_DIFF16
8197 || r_type == R_XTENSA_DIFF32)
8199 bfd_vma diff_value = 0, new_end_offset, diff_mask = 0;
8201 if (bfd_get_section_limit (abfd, sec) < old_source_offset)
8203 (*link_info->callbacks->reloc_dangerous)
8204 (link_info, _("invalid relocation address"),
8205 abfd, sec, old_source_offset);
8211 case R_XTENSA_DIFF8:
8213 bfd_get_8 (abfd, &contents[old_source_offset]);
8215 case R_XTENSA_DIFF16:
8217 bfd_get_16 (abfd, &contents[old_source_offset]);
8219 case R_XTENSA_DIFF32:
8221 bfd_get_32 (abfd, &contents[old_source_offset]);
8225 new_end_offset = offset_with_removed_text
8226 (&target_relax_info->action_list,
8227 r_rel.target_offset + diff_value);
8228 diff_value = new_end_offset - new_reloc.target_offset;
8232 case R_XTENSA_DIFF8:
8234 bfd_put_8 (abfd, diff_value,
8235 &contents[old_source_offset]);
8237 case R_XTENSA_DIFF16:
8239 bfd_put_16 (abfd, diff_value,
8240 &contents[old_source_offset]);
8242 case R_XTENSA_DIFF32:
8243 diff_mask = 0xffffffff;
8244 bfd_put_32 (abfd, diff_value,
8245 &contents[old_source_offset]);
8249 /* Check for overflow. */
8250 if ((diff_value & ~diff_mask) != 0)
8252 (*link_info->callbacks->reloc_dangerous)
8253 (link_info, _("overflow after relaxation"),
8254 abfd, sec, old_source_offset);
8258 pin_contents (sec, contents);
8261 /* If the relocation still references a section in the same
8262 input file, modify the relocation directly instead of
8263 adding a "fix" record. */
8264 if (target_sec->owner == abfd)
8266 unsigned r_symndx = ELF32_R_SYM (new_reloc.rela.r_info);
8267 irel->r_info = ELF32_R_INFO (r_symndx, r_type);
8268 irel->r_addend = new_reloc.rela.r_addend;
8269 pin_internal_relocs (sec, internal_relocs);
8273 bfd_vma addend_displacement;
8276 addend_displacement =
8277 new_reloc.target_offset + new_reloc.virtual_offset;
8278 fix = reloc_bfd_fix_init (sec, source_offset, r_type,
8280 addend_displacement, TRUE);
8287 if ((relax_info->is_relaxable_literal_section
8288 || relax_info->is_relaxable_asm_section)
8289 && relax_info->action_list.head)
8291 /* Walk through the planned actions and build up a table
8292 of move, copy and fill records. Use the move, copy and
8293 fill records to perform the actions once. */
8296 bfd_size_type final_size, copy_size, orig_insn_size;
8297 bfd_byte *scratch = NULL;
8298 bfd_byte *dup_contents = NULL;
8299 bfd_size_type orig_size = sec->size;
8300 bfd_vma orig_dot = 0;
8301 bfd_vma orig_dot_copied = 0; /* Byte copied already from
8302 orig dot in physical memory. */
8303 bfd_vma orig_dot_vo = 0; /* Virtual offset from orig_dot. */
8304 bfd_vma dup_dot = 0;
8306 text_action *action = relax_info->action_list.head;
8308 final_size = sec->size;
8309 for (action = relax_info->action_list.head; action;
8310 action = action->next)
8312 final_size -= action->removed_bytes;
8315 scratch = (bfd_byte *) bfd_zmalloc (final_size);
8316 dup_contents = (bfd_byte *) bfd_zmalloc (final_size);
8318 /* The dot is the current fill location. */
8320 print_action_list (stderr, &relax_info->action_list);
8323 for (action = relax_info->action_list.head; action;
8324 action = action->next)
8326 virtual_action = FALSE;
8327 if (action->offset > orig_dot)
8329 orig_dot += orig_dot_copied;
8330 orig_dot_copied = 0;
8332 /* Out of the virtual world. */
8335 if (action->offset > orig_dot)
8337 copy_size = action->offset - orig_dot;
8338 memmove (&dup_contents[dup_dot], &contents[orig_dot], copy_size);
8339 orig_dot += copy_size;
8340 dup_dot += copy_size;
8341 BFD_ASSERT (action->offset == orig_dot);
8343 else if (action->offset < orig_dot)
8345 if (action->action == ta_fill
8346 && action->offset - action->removed_bytes == orig_dot)
8348 /* This is OK because the fill only effects the dup_dot. */
8350 else if (action->action == ta_add_literal)
8352 /* TBD. Might need to handle this. */
8355 if (action->offset == orig_dot)
8357 if (action->virtual_offset > orig_dot_vo)
8359 if (orig_dot_vo == 0)
8361 /* Need to copy virtual_offset bytes. Probably four. */
8362 copy_size = action->virtual_offset - orig_dot_vo;
8363 memmove (&dup_contents[dup_dot],
8364 &contents[orig_dot], copy_size);
8365 orig_dot_copied = copy_size;
8366 dup_dot += copy_size;
8368 virtual_action = TRUE;
8371 BFD_ASSERT (action->virtual_offset <= orig_dot_vo);
8373 switch (action->action)
8375 case ta_remove_literal:
8376 case ta_remove_insn:
8377 BFD_ASSERT (action->removed_bytes >= 0);
8378 orig_dot += action->removed_bytes;
8381 case ta_narrow_insn:
8384 memmove (scratch, &contents[orig_dot], orig_insn_size);
8385 BFD_ASSERT (action->removed_bytes == 1);
8386 rv = narrow_instruction (scratch, final_size, 0);
8388 memmove (&dup_contents[dup_dot], scratch, copy_size);
8389 orig_dot += orig_insn_size;
8390 dup_dot += copy_size;
8394 if (action->removed_bytes >= 0)
8395 orig_dot += action->removed_bytes;
8398 /* Already zeroed in dup_contents. Just bump the
8400 dup_dot += (-action->removed_bytes);
8405 BFD_ASSERT (action->removed_bytes == 0);
8408 case ta_convert_longcall:
8409 case ta_remove_longcall:
8410 /* These will be removed or converted before we get here. */
8417 memmove (scratch, &contents[orig_dot], orig_insn_size);
8418 BFD_ASSERT (action->removed_bytes == -1);
8419 rv = widen_instruction (scratch, final_size, 0);
8421 memmove (&dup_contents[dup_dot], scratch, copy_size);
8422 orig_dot += orig_insn_size;
8423 dup_dot += copy_size;
8426 case ta_add_literal:
8429 BFD_ASSERT (action->removed_bytes == -4);
8430 /* TBD -- place the literal value here and insert
8432 memset (&dup_contents[dup_dot], 0, 4);
8433 pin_internal_relocs (sec, internal_relocs);
8434 pin_contents (sec, contents);
8436 if (!move_literal (abfd, link_info, sec, dup_dot, dup_contents,
8437 relax_info, &internal_relocs, &action->value))
8441 orig_dot_vo += copy_size;
8443 orig_dot += orig_insn_size;
8444 dup_dot += copy_size;
8448 /* Not implemented yet. */
8453 removed += action->removed_bytes;
8454 BFD_ASSERT (dup_dot <= final_size);
8455 BFD_ASSERT (orig_dot <= orig_size);
8458 orig_dot += orig_dot_copied;
8459 orig_dot_copied = 0;
8461 if (orig_dot != orig_size)
8463 copy_size = orig_size - orig_dot;
8464 BFD_ASSERT (orig_size > orig_dot);
8465 BFD_ASSERT (dup_dot + copy_size == final_size);
8466 memmove (&dup_contents[dup_dot], &contents[orig_dot], copy_size);
8467 orig_dot += copy_size;
8468 dup_dot += copy_size;
8470 BFD_ASSERT (orig_size == orig_dot);
8471 BFD_ASSERT (final_size == dup_dot);
8473 /* Move the dup_contents back. */
8474 if (final_size > orig_size)
8476 /* Contents need to be reallocated. Swap the dup_contents into
8478 sec->contents = dup_contents;
8480 contents = dup_contents;
8481 pin_contents (sec, contents);
8485 BFD_ASSERT (final_size <= orig_size);
8486 memset (contents, 0, orig_size);
8487 memcpy (contents, dup_contents, final_size);
8488 free (dup_contents);
8491 pin_contents (sec, contents);
8493 if (sec->rawsize == 0)
8494 sec->rawsize = sec->size;
8495 sec->size = final_size;
8499 release_internal_relocs (sec, internal_relocs);
8500 release_contents (sec, contents);
8506 translate_section_fixes (asection *sec)
8508 xtensa_relax_info *relax_info;
8511 relax_info = get_xtensa_relax_info (sec);
8515 for (r = relax_info->fix_list; r != NULL; r = r->next)
8516 if (!translate_reloc_bfd_fix (r))
8523 /* Translate a fix given the mapping in the relax info for the target
8524 section. If it has already been translated, no work is required. */
8527 translate_reloc_bfd_fix (reloc_bfd_fix *fix)
8529 reloc_bfd_fix new_fix;
8531 xtensa_relax_info *relax_info;
8532 removed_literal *removed;
8533 bfd_vma new_offset, target_offset;
8535 if (fix->translated)
8538 sec = fix->target_sec;
8539 target_offset = fix->target_offset;
8541 relax_info = get_xtensa_relax_info (sec);
8544 fix->translated = TRUE;
8550 /* The fix does not need to be translated if the section cannot change. */
8551 if (!relax_info->is_relaxable_literal_section
8552 && !relax_info->is_relaxable_asm_section)
8554 fix->translated = TRUE;
8558 /* If the literal has been moved and this relocation was on an
8559 opcode, then the relocation should move to the new literal
8560 location. Otherwise, the relocation should move within the
8564 if (is_operand_relocation (fix->src_type))
8566 /* Check if the original relocation is against a literal being
8568 removed = find_removed_literal (&relax_info->removed_list,
8576 /* The fact that there is still a relocation to this literal indicates
8577 that the literal is being coalesced, not simply removed. */
8578 BFD_ASSERT (removed->to.abfd != NULL);
8580 /* This was moved to some other address (possibly another section). */
8581 new_sec = r_reloc_get_section (&removed->to);
8585 relax_info = get_xtensa_relax_info (sec);
8587 (!relax_info->is_relaxable_literal_section
8588 && !relax_info->is_relaxable_asm_section))
8590 target_offset = removed->to.target_offset;
8591 new_fix.target_sec = new_sec;
8592 new_fix.target_offset = target_offset;
8593 new_fix.translated = TRUE;
8598 target_offset = removed->to.target_offset;
8599 new_fix.target_sec = new_sec;
8602 /* The target address may have been moved within its section. */
8603 new_offset = offset_with_removed_text (&relax_info->action_list,
8606 new_fix.target_offset = new_offset;
8607 new_fix.target_offset = new_offset;
8608 new_fix.translated = TRUE;
8614 /* Fix up a relocation to take account of removed literals. */
8617 translate_reloc (const r_reloc *orig_rel, r_reloc *new_rel, asection *sec)
8619 xtensa_relax_info *relax_info;
8620 removed_literal *removed;
8621 bfd_vma target_offset, base_offset;
8624 *new_rel = *orig_rel;
8626 if (!r_reloc_is_defined (orig_rel))
8629 relax_info = get_xtensa_relax_info (sec);
8630 BFD_ASSERT (relax_info && (relax_info->is_relaxable_literal_section
8631 || relax_info->is_relaxable_asm_section));
8633 target_offset = orig_rel->target_offset;
8636 if (is_operand_relocation (ELF32_R_TYPE (orig_rel->rela.r_info)))
8638 /* Check if the original relocation is against a literal being
8640 removed = find_removed_literal (&relax_info->removed_list,
8643 if (removed && removed->to.abfd)
8647 /* The fact that there is still a relocation to this literal indicates
8648 that the literal is being coalesced, not simply removed. */
8649 BFD_ASSERT (removed->to.abfd != NULL);
8651 /* This was moved to some other address
8652 (possibly in another section). */
8653 *new_rel = removed->to;
8654 new_sec = r_reloc_get_section (new_rel);
8658 relax_info = get_xtensa_relax_info (sec);
8660 || (!relax_info->is_relaxable_literal_section
8661 && !relax_info->is_relaxable_asm_section))
8664 target_offset = new_rel->target_offset;
8667 /* Find the base offset of the reloc symbol, excluding any addend from the
8668 reloc or from the section contents (for a partial_inplace reloc). Then
8669 find the adjusted values of the offsets due to relaxation. The base
8670 offset is needed to determine the change to the reloc's addend; the reloc
8671 addend should not be adjusted due to relaxations located before the base
8674 base_offset = r_reloc_get_target_offset (new_rel) - new_rel->rela.r_addend;
8675 act = relax_info->action_list.head;
8676 if (base_offset <= target_offset)
8678 int base_removed = removed_by_actions (&act, base_offset, FALSE);
8679 int addend_removed = removed_by_actions (&act, target_offset, FALSE);
8680 new_rel->target_offset = target_offset - base_removed - addend_removed;
8681 new_rel->rela.r_addend -= addend_removed;
8685 /* Handle a negative addend. The base offset comes first. */
8686 int tgt_removed = removed_by_actions (&act, target_offset, FALSE);
8687 int addend_removed = removed_by_actions (&act, base_offset, FALSE);
8688 new_rel->target_offset = target_offset - tgt_removed;
8689 new_rel->rela.r_addend += addend_removed;
8696 /* For dynamic links, there may be a dynamic relocation for each
8697 literal. The number of dynamic relocations must be computed in
8698 size_dynamic_sections, which occurs before relaxation. When a
8699 literal is removed, this function checks if there is a corresponding
8700 dynamic relocation and shrinks the size of the appropriate dynamic
8701 relocation section accordingly. At this point, the contents of the
8702 dynamic relocation sections have not yet been filled in, so there's
8703 nothing else that needs to be done. */
8706 shrink_dynamic_reloc_sections (struct bfd_link_info *info,
8708 asection *input_section,
8709 Elf_Internal_Rela *rel)
8711 struct elf_xtensa_link_hash_table *htab;
8712 Elf_Internal_Shdr *symtab_hdr;
8713 struct elf_link_hash_entry **sym_hashes;
8714 unsigned long r_symndx;
8716 struct elf_link_hash_entry *h;
8717 bfd_boolean dynamic_symbol;
8719 htab = elf_xtensa_hash_table (info);
8720 symtab_hdr = &elf_tdata (abfd)->symtab_hdr;
8721 sym_hashes = elf_sym_hashes (abfd);
8723 r_type = ELF32_R_TYPE (rel->r_info);
8724 r_symndx = ELF32_R_SYM (rel->r_info);
8726 if (r_symndx < symtab_hdr->sh_info)
8729 h = sym_hashes[r_symndx - symtab_hdr->sh_info];
8731 dynamic_symbol = elf_xtensa_dynamic_symbol_p (h, info);
8733 if ((r_type == R_XTENSA_32 || r_type == R_XTENSA_PLT)
8734 && (input_section->flags & SEC_ALLOC) != 0
8735 && (dynamic_symbol || info->shared))
8738 bfd_boolean is_plt = FALSE;
8740 if (dynamic_symbol && r_type == R_XTENSA_PLT)
8742 srel = htab->srelplt;
8746 srel = htab->srelgot;
8748 /* Reduce size of the .rela.* section by one reloc. */
8749 BFD_ASSERT (srel != NULL);
8750 BFD_ASSERT (srel->size >= sizeof (Elf32_External_Rela));
8751 srel->size -= sizeof (Elf32_External_Rela);
8755 asection *splt, *sgotplt, *srelgot;
8756 int reloc_index, chunk;
8758 /* Find the PLT reloc index of the entry being removed. This
8759 is computed from the size of ".rela.plt". It is needed to
8760 figure out which PLT chunk to resize. Usually "last index
8761 = size - 1" since the index starts at zero, but in this
8762 context, the size has just been decremented so there's no
8763 need to subtract one. */
8764 reloc_index = srel->size / sizeof (Elf32_External_Rela);
8766 chunk = reloc_index / PLT_ENTRIES_PER_CHUNK;
8767 splt = elf_xtensa_get_plt_section (info, chunk);
8768 sgotplt = elf_xtensa_get_gotplt_section (info, chunk);
8769 BFD_ASSERT (splt != NULL && sgotplt != NULL);
8771 /* Check if an entire PLT chunk has just been eliminated. */
8772 if (reloc_index % PLT_ENTRIES_PER_CHUNK == 0)
8774 /* The two magic GOT entries for that chunk can go away. */
8775 srelgot = htab->srelgot;
8776 BFD_ASSERT (srelgot != NULL);
8777 srelgot->reloc_count -= 2;
8778 srelgot->size -= 2 * sizeof (Elf32_External_Rela);
8781 /* There should be only one entry left (and it will be
8783 BFD_ASSERT (sgotplt->size == 4);
8784 BFD_ASSERT (splt->size == PLT_ENTRY_SIZE);
8787 BFD_ASSERT (sgotplt->size >= 4);
8788 BFD_ASSERT (splt->size >= PLT_ENTRY_SIZE);
8791 splt->size -= PLT_ENTRY_SIZE;
8797 /* Take an r_rel and move it to another section. This usually
8798 requires extending the interal_relocation array and pinning it. If
8799 the original r_rel is from the same BFD, we can complete this here.
8800 Otherwise, we add a fix record to let the final link fix the
8801 appropriate address. Contents and internal relocations for the
8802 section must be pinned after calling this routine. */
8805 move_literal (bfd *abfd,
8806 struct bfd_link_info *link_info,
8810 xtensa_relax_info *relax_info,
8811 Elf_Internal_Rela **internal_relocs_p,
8812 const literal_value *lit)
8814 Elf_Internal_Rela *new_relocs = NULL;
8815 size_t new_relocs_count = 0;
8816 Elf_Internal_Rela this_rela;
8817 const r_reloc *r_rel;
8819 r_rel = &lit->r_rel;
8820 BFD_ASSERT (elf_section_data (sec)->relocs == *internal_relocs_p);
8822 if (r_reloc_is_const (r_rel))
8823 bfd_put_32 (abfd, lit->value, contents + offset);
8828 asection *target_sec;
8832 r_type = ELF32_R_TYPE (r_rel->rela.r_info);
8833 target_sec = r_reloc_get_section (r_rel);
8835 /* This is the difficult case. We have to create a fix up. */
8836 this_rela.r_offset = offset;
8837 this_rela.r_info = ELF32_R_INFO (0, r_type);
8838 this_rela.r_addend =
8839 r_rel->target_offset - r_reloc_get_target_offset (r_rel);
8840 bfd_put_32 (abfd, lit->value, contents + offset);
8842 /* Currently, we cannot move relocations during a relocatable link. */
8843 BFD_ASSERT (!link_info->relocatable);
8844 fix = reloc_bfd_fix_init (sec, offset, r_type,
8845 r_reloc_get_section (r_rel),
8846 r_rel->target_offset + r_rel->virtual_offset,
8848 /* We also need to mark that relocations are needed here. */
8849 sec->flags |= SEC_RELOC;
8851 translate_reloc_bfd_fix (fix);
8852 /* This fix has not yet been translated. */
8855 /* Add the relocation. If we have already allocated our own
8856 space for the relocations and we have room for more, then use
8857 it. Otherwise, allocate new space and move the literals. */
8858 insert_at = sec->reloc_count;
8859 for (i = 0; i < sec->reloc_count; ++i)
8861 if (this_rela.r_offset < (*internal_relocs_p)[i].r_offset)
8868 if (*internal_relocs_p != relax_info->allocated_relocs
8869 || sec->reloc_count + 1 > relax_info->allocated_relocs_count)
8871 BFD_ASSERT (relax_info->allocated_relocs == NULL
8872 || sec->reloc_count == relax_info->relocs_count);
8874 if (relax_info->allocated_relocs_count == 0)
8875 new_relocs_count = (sec->reloc_count + 2) * 2;
8877 new_relocs_count = (relax_info->allocated_relocs_count + 2) * 2;
8879 new_relocs = (Elf_Internal_Rela *)
8880 bfd_zmalloc (sizeof (Elf_Internal_Rela) * (new_relocs_count));
8884 /* We could handle this more quickly by finding the split point. */
8886 memcpy (new_relocs, *internal_relocs_p,
8887 insert_at * sizeof (Elf_Internal_Rela));
8889 new_relocs[insert_at] = this_rela;
8891 if (insert_at != sec->reloc_count)
8892 memcpy (new_relocs + insert_at + 1,
8893 (*internal_relocs_p) + insert_at,
8894 (sec->reloc_count - insert_at)
8895 * sizeof (Elf_Internal_Rela));
8897 if (*internal_relocs_p != relax_info->allocated_relocs)
8899 /* The first time we re-allocate, we can only free the
8900 old relocs if they were allocated with bfd_malloc.
8901 This is not true when keep_memory is in effect. */
8902 if (!link_info->keep_memory)
8903 free (*internal_relocs_p);
8906 free (*internal_relocs_p);
8907 relax_info->allocated_relocs = new_relocs;
8908 relax_info->allocated_relocs_count = new_relocs_count;
8909 elf_section_data (sec)->relocs = new_relocs;
8911 relax_info->relocs_count = sec->reloc_count;
8912 *internal_relocs_p = new_relocs;
8916 if (insert_at != sec->reloc_count)
8919 for (idx = sec->reloc_count; idx > insert_at; idx--)
8920 (*internal_relocs_p)[idx] = (*internal_relocs_p)[idx-1];
8922 (*internal_relocs_p)[insert_at] = this_rela;
8924 if (relax_info->allocated_relocs)
8925 relax_info->relocs_count = sec->reloc_count;
8932 /* This is similar to relax_section except that when a target is moved,
8933 we shift addresses up. We also need to modify the size. This
8934 algorithm does NOT allow for relocations into the middle of the
8935 property sections. */
8938 relax_property_section (bfd *abfd,
8940 struct bfd_link_info *link_info)
8942 Elf_Internal_Rela *internal_relocs;
8945 bfd_boolean ok = TRUE;
8946 bfd_boolean is_full_prop_section;
8947 size_t last_zfill_target_offset = 0;
8948 asection *last_zfill_target_sec = NULL;
8949 bfd_size_type sec_size;
8950 bfd_size_type entry_size;
8952 sec_size = bfd_get_section_limit (abfd, sec);
8953 internal_relocs = retrieve_internal_relocs (abfd, sec,
8954 link_info->keep_memory);
8955 contents = retrieve_contents (abfd, sec, link_info->keep_memory);
8956 if (contents == NULL && sec_size != 0)
8962 is_full_prop_section = xtensa_is_proptable_section (sec);
8963 if (is_full_prop_section)
8968 if (internal_relocs)
8970 for (i = 0; i < sec->reloc_count; i++)
8972 Elf_Internal_Rela *irel;
8973 xtensa_relax_info *target_relax_info;
8975 asection *target_sec;
8977 bfd_byte *size_p, *flags_p;
8979 /* Locally change the source address.
8980 Translate the target to the new target address.
8981 If it points to this section and has been removed, MOVE IT.
8982 Also, don't forget to modify the associated SIZE at
8985 irel = &internal_relocs[i];
8986 r_type = ELF32_R_TYPE (irel->r_info);
8987 if (r_type == R_XTENSA_NONE)
8990 /* Find the literal value. */
8991 r_reloc_init (&val.r_rel, abfd, irel, contents, sec_size);
8992 size_p = &contents[irel->r_offset + 4];
8994 if (is_full_prop_section)
8995 flags_p = &contents[irel->r_offset + 8];
8996 BFD_ASSERT (irel->r_offset + entry_size <= sec_size);
8998 target_sec = r_reloc_get_section (&val.r_rel);
8999 target_relax_info = get_xtensa_relax_info (target_sec);
9001 if (target_relax_info
9002 && (target_relax_info->is_relaxable_literal_section
9003 || target_relax_info->is_relaxable_asm_section ))
9005 /* Translate the relocation's destination. */
9006 bfd_vma old_offset = val.r_rel.target_offset;
9008 long old_size, new_size;
9009 text_action *act = target_relax_info->action_list.head;
9010 new_offset = old_offset -
9011 removed_by_actions (&act, old_offset, FALSE);
9013 /* Assert that we are not out of bounds. */
9014 old_size = bfd_get_32 (abfd, size_p);
9015 new_size = old_size;
9019 /* Only the first zero-sized unreachable entry is
9020 allowed to expand. In this case the new offset
9021 should be the offset before the fill and the new
9022 size is the expansion size. For other zero-sized
9023 entries the resulting size should be zero with an
9024 offset before or after the fill address depending
9025 on whether the expanding unreachable entry
9027 if (last_zfill_target_sec == 0
9028 || last_zfill_target_sec != target_sec
9029 || last_zfill_target_offset != old_offset)
9031 bfd_vma new_end_offset = new_offset;
9033 /* Recompute the new_offset, but this time don't
9034 include any fill inserted by relaxation. */
9035 act = target_relax_info->action_list.head;
9036 new_offset = old_offset -
9037 removed_by_actions (&act, old_offset, TRUE);
9039 /* If it is not unreachable and we have not yet
9040 seen an unreachable at this address, place it
9041 before the fill address. */
9042 if (flags_p && (bfd_get_32 (abfd, flags_p)
9043 & XTENSA_PROP_UNREACHABLE) != 0)
9045 new_size = new_end_offset - new_offset;
9047 last_zfill_target_sec = target_sec;
9048 last_zfill_target_offset = old_offset;
9054 removed_by_actions (&act, old_offset + old_size, TRUE);
9056 if (new_size != old_size)
9058 bfd_put_32 (abfd, new_size, size_p);
9059 pin_contents (sec, contents);
9062 if (new_offset != old_offset)
9064 bfd_vma diff = new_offset - old_offset;
9065 irel->r_addend += diff;
9066 pin_internal_relocs (sec, internal_relocs);
9072 /* Combine adjacent property table entries. This is also done in
9073 finish_dynamic_sections() but at that point it's too late to
9074 reclaim the space in the output section, so we do this twice. */
9076 if (internal_relocs && (!link_info->relocatable
9077 || xtensa_is_littable_section (sec)))
9079 Elf_Internal_Rela *last_irel = NULL;
9080 Elf_Internal_Rela *irel, *next_rel, *rel_end;
9081 int removed_bytes = 0;
9083 flagword predef_flags;
9085 predef_flags = xtensa_get_property_predef_flags (sec);
9087 /* Walk over memory and relocations at the same time.
9088 This REQUIRES that the internal_relocs be sorted by offset. */
9089 qsort (internal_relocs, sec->reloc_count, sizeof (Elf_Internal_Rela),
9090 internal_reloc_compare);
9092 pin_internal_relocs (sec, internal_relocs);
9093 pin_contents (sec, contents);
9095 next_rel = internal_relocs;
9096 rel_end = internal_relocs + sec->reloc_count;
9098 BFD_ASSERT (sec->size % entry_size == 0);
9100 for (offset = 0; offset < sec->size; offset += entry_size)
9102 Elf_Internal_Rela *offset_rel, *extra_rel;
9103 bfd_vma bytes_to_remove, size, actual_offset;
9104 bfd_boolean remove_this_rel;
9107 /* Find the first relocation for the entry at the current offset.
9108 Adjust the offsets of any extra relocations for the previous
9113 for (irel = next_rel; irel < rel_end; irel++)
9115 if ((irel->r_offset == offset
9116 && ELF32_R_TYPE (irel->r_info) != R_XTENSA_NONE)
9117 || irel->r_offset > offset)
9122 irel->r_offset -= removed_bytes;
9126 /* Find the next relocation (if there are any left). */
9130 for (irel = offset_rel + 1; irel < rel_end; irel++)
9132 if (ELF32_R_TYPE (irel->r_info) != R_XTENSA_NONE)
9140 /* Check if there are relocations on the current entry. There
9141 should usually be a relocation on the offset field. If there
9142 are relocations on the size or flags, then we can't optimize
9143 this entry. Also, find the next relocation to examine on the
9147 if (offset_rel->r_offset >= offset + entry_size)
9149 next_rel = offset_rel;
9150 /* There are no relocations on the current entry, but we
9151 might still be able to remove it if the size is zero. */
9154 else if (offset_rel->r_offset > offset
9156 && extra_rel->r_offset < offset + entry_size))
9158 /* There is a relocation on the size or flags, so we can't
9159 do anything with this entry. Continue with the next. */
9160 next_rel = offset_rel;
9165 BFD_ASSERT (offset_rel->r_offset == offset);
9166 offset_rel->r_offset -= removed_bytes;
9167 next_rel = offset_rel + 1;
9173 remove_this_rel = FALSE;
9174 bytes_to_remove = 0;
9175 actual_offset = offset - removed_bytes;
9176 size = bfd_get_32 (abfd, &contents[actual_offset + 4]);
9178 if (is_full_prop_section)
9179 flags = bfd_get_32 (abfd, &contents[actual_offset + 8]);
9181 flags = predef_flags;
9184 && (flags & XTENSA_PROP_ALIGN) == 0
9185 && (flags & XTENSA_PROP_UNREACHABLE) == 0)
9187 /* Always remove entries with zero size and no alignment. */
9188 bytes_to_remove = entry_size;
9190 remove_this_rel = TRUE;
9193 && ELF32_R_TYPE (offset_rel->r_info) == R_XTENSA_32)
9199 bfd_get_32 (abfd, &contents[last_irel->r_offset + 4]);
9200 bfd_vma old_address =
9201 (last_irel->r_addend
9202 + bfd_get_32 (abfd, &contents[last_irel->r_offset]));
9203 bfd_vma new_address =
9204 (offset_rel->r_addend
9205 + bfd_get_32 (abfd, &contents[actual_offset]));
9206 if (is_full_prop_section)
9207 old_flags = bfd_get_32
9208 (abfd, &contents[last_irel->r_offset + 8]);
9210 old_flags = predef_flags;
9212 if ((ELF32_R_SYM (offset_rel->r_info)
9213 == ELF32_R_SYM (last_irel->r_info))
9214 && old_address + old_size == new_address
9215 && old_flags == flags
9216 && (old_flags & XTENSA_PROP_INSN_BRANCH_TARGET) == 0
9217 && (old_flags & XTENSA_PROP_INSN_LOOP_TARGET) == 0)
9219 /* Fix the old size. */
9220 bfd_put_32 (abfd, old_size + size,
9221 &contents[last_irel->r_offset + 4]);
9222 bytes_to_remove = entry_size;
9223 remove_this_rel = TRUE;
9226 last_irel = offset_rel;
9229 last_irel = offset_rel;
9232 if (remove_this_rel)
9234 offset_rel->r_info = ELF32_R_INFO (0, R_XTENSA_NONE);
9235 /* In case this is the last entry, move the relocation offset
9236 to the previous entry, if there is one. */
9237 if (offset_rel->r_offset >= bytes_to_remove)
9238 offset_rel->r_offset -= bytes_to_remove;
9240 offset_rel->r_offset = 0;
9243 if (bytes_to_remove != 0)
9245 removed_bytes += bytes_to_remove;
9246 if (offset + bytes_to_remove < sec->size)
9247 memmove (&contents[actual_offset],
9248 &contents[actual_offset + bytes_to_remove],
9249 sec->size - offset - bytes_to_remove);
9255 /* Fix up any extra relocations on the last entry. */
9256 for (irel = next_rel; irel < rel_end; irel++)
9257 irel->r_offset -= removed_bytes;
9259 /* Clear the removed bytes. */
9260 memset (&contents[sec->size - removed_bytes], 0, removed_bytes);
9262 if (sec->rawsize == 0)
9263 sec->rawsize = sec->size;
9264 sec->size -= removed_bytes;
9266 if (xtensa_is_littable_section (sec))
9268 asection *sgotloc = elf_xtensa_hash_table (link_info)->sgotloc;
9270 sgotloc->size -= removed_bytes;
9276 release_internal_relocs (sec, internal_relocs);
9277 release_contents (sec, contents);
9282 /* Third relaxation pass. */
9284 /* Change symbol values to account for removed literals. */
9287 relax_section_symbols (bfd *abfd, asection *sec)
9289 xtensa_relax_info *relax_info;
9290 unsigned int sec_shndx;
9291 Elf_Internal_Shdr *symtab_hdr;
9292 Elf_Internal_Sym *isymbuf;
9293 unsigned i, num_syms, num_locals;
9295 relax_info = get_xtensa_relax_info (sec);
9296 BFD_ASSERT (relax_info);
9298 if (!relax_info->is_relaxable_literal_section
9299 && !relax_info->is_relaxable_asm_section)
9302 sec_shndx = _bfd_elf_section_from_bfd_section (abfd, sec);
9304 symtab_hdr = &elf_tdata (abfd)->symtab_hdr;
9305 isymbuf = retrieve_local_syms (abfd);
9307 num_syms = symtab_hdr->sh_size / sizeof (Elf32_External_Sym);
9308 num_locals = symtab_hdr->sh_info;
9310 /* Adjust the local symbols defined in this section. */
9311 for (i = 0; i < num_locals; i++)
9313 Elf_Internal_Sym *isym = &isymbuf[i];
9315 if (isym->st_shndx == sec_shndx)
9317 text_action *act = relax_info->action_list.head;
9318 bfd_vma orig_addr = isym->st_value;
9320 isym->st_value -= removed_by_actions (&act, orig_addr, FALSE);
9322 if (ELF32_ST_TYPE (isym->st_info) == STT_FUNC)
9324 removed_by_actions (&act, orig_addr + isym->st_size, FALSE);
9328 /* Now adjust the global symbols defined in this section. */
9329 for (i = 0; i < (num_syms - num_locals); i++)
9331 struct elf_link_hash_entry *sym_hash;
9333 sym_hash = elf_sym_hashes (abfd)[i];
9335 if (sym_hash->root.type == bfd_link_hash_warning)
9336 sym_hash = (struct elf_link_hash_entry *) sym_hash->root.u.i.link;
9338 if ((sym_hash->root.type == bfd_link_hash_defined
9339 || sym_hash->root.type == bfd_link_hash_defweak)
9340 && sym_hash->root.u.def.section == sec)
9342 text_action *act = relax_info->action_list.head;
9343 bfd_vma orig_addr = sym_hash->root.u.def.value;
9345 sym_hash->root.u.def.value -=
9346 removed_by_actions (&act, orig_addr, FALSE);
9348 if (sym_hash->type == STT_FUNC)
9350 removed_by_actions (&act, orig_addr + sym_hash->size, FALSE);
9358 /* "Fix" handling functions, called while performing relocations. */
9361 do_fix_for_relocatable_link (Elf_Internal_Rela *rel,
9363 asection *input_section,
9367 asection *sec, *old_sec;
9369 int r_type = ELF32_R_TYPE (rel->r_info);
9372 if (r_type == R_XTENSA_NONE)
9375 fix = get_bfd_fix (input_section, rel->r_offset, r_type);
9379 r_reloc_init (&r_rel, input_bfd, rel, contents,
9380 bfd_get_section_limit (input_bfd, input_section));
9381 old_sec = r_reloc_get_section (&r_rel);
9382 old_offset = r_rel.target_offset;
9384 if (!old_sec || !r_reloc_is_defined (&r_rel))
9386 if (r_type != R_XTENSA_ASM_EXPAND)
9388 (*_bfd_error_handler)
9389 (_("%B(%A+0x%lx): unexpected fix for %s relocation"),
9390 input_bfd, input_section, rel->r_offset,
9391 elf_howto_table[r_type].name);
9394 /* Leave it be. Resolution will happen in a later stage. */
9398 sec = fix->target_sec;
9399 rel->r_addend += ((sec->output_offset + fix->target_offset)
9400 - (old_sec->output_offset + old_offset));
9407 do_fix_for_final_link (Elf_Internal_Rela *rel,
9409 asection *input_section,
9411 bfd_vma *relocationp)
9414 int r_type = ELF32_R_TYPE (rel->r_info);
9418 if (r_type == R_XTENSA_NONE)
9421 fix = get_bfd_fix (input_section, rel->r_offset, r_type);
9425 sec = fix->target_sec;
9427 fixup_diff = rel->r_addend;
9428 if (elf_howto_table[fix->src_type].partial_inplace)
9430 bfd_vma inplace_val;
9431 BFD_ASSERT (fix->src_offset
9432 < bfd_get_section_limit (input_bfd, input_section));
9433 inplace_val = bfd_get_32 (input_bfd, &contents[fix->src_offset]);
9434 fixup_diff += inplace_val;
9437 *relocationp = (sec->output_section->vma
9438 + sec->output_offset
9439 + fix->target_offset - fixup_diff);
9443 /* Miscellaneous utility functions.... */
9446 elf_xtensa_get_plt_section (struct bfd_link_info *info, int chunk)
9448 struct elf_xtensa_link_hash_table *htab;
9454 htab = elf_xtensa_hash_table (info);
9458 dynobj = elf_hash_table (info)->dynobj;
9459 sprintf (plt_name, ".plt.%u", chunk);
9460 return bfd_get_section_by_name (dynobj, plt_name);
9465 elf_xtensa_get_gotplt_section (struct bfd_link_info *info, int chunk)
9467 struct elf_xtensa_link_hash_table *htab;
9473 htab = elf_xtensa_hash_table (info);
9474 return htab->sgotplt;
9477 dynobj = elf_hash_table (info)->dynobj;
9478 sprintf (got_name, ".got.plt.%u", chunk);
9479 return bfd_get_section_by_name (dynobj, got_name);
9483 /* Get the input section for a given symbol index.
9485 . a section symbol, return the section;
9486 . a common symbol, return the common section;
9487 . an undefined symbol, return the undefined section;
9488 . an indirect symbol, follow the links;
9489 . an absolute value, return the absolute section. */
9492 get_elf_r_symndx_section (bfd *abfd, unsigned long r_symndx)
9494 Elf_Internal_Shdr *symtab_hdr = &elf_tdata (abfd)->symtab_hdr;
9495 asection *target_sec = NULL;
9496 if (r_symndx < symtab_hdr->sh_info)
9498 Elf_Internal_Sym *isymbuf;
9499 unsigned int section_index;
9501 isymbuf = retrieve_local_syms (abfd);
9502 section_index = isymbuf[r_symndx].st_shndx;
9504 if (section_index == SHN_UNDEF)
9505 target_sec = bfd_und_section_ptr;
9506 else if (section_index == SHN_ABS)
9507 target_sec = bfd_abs_section_ptr;
9508 else if (section_index == SHN_COMMON)
9509 target_sec = bfd_com_section_ptr;
9511 target_sec = bfd_section_from_elf_index (abfd, section_index);
9515 unsigned long indx = r_symndx - symtab_hdr->sh_info;
9516 struct elf_link_hash_entry *h = elf_sym_hashes (abfd)[indx];
9518 while (h->root.type == bfd_link_hash_indirect
9519 || h->root.type == bfd_link_hash_warning)
9520 h = (struct elf_link_hash_entry *) h->root.u.i.link;
9522 switch (h->root.type)
9524 case bfd_link_hash_defined:
9525 case bfd_link_hash_defweak:
9526 target_sec = h->root.u.def.section;
9528 case bfd_link_hash_common:
9529 target_sec = bfd_com_section_ptr;
9531 case bfd_link_hash_undefined:
9532 case bfd_link_hash_undefweak:
9533 target_sec = bfd_und_section_ptr;
9535 default: /* New indirect warning. */
9536 target_sec = bfd_und_section_ptr;
9544 static struct elf_link_hash_entry *
9545 get_elf_r_symndx_hash_entry (bfd *abfd, unsigned long r_symndx)
9548 struct elf_link_hash_entry *h;
9549 Elf_Internal_Shdr *symtab_hdr = &elf_tdata (abfd)->symtab_hdr;
9551 if (r_symndx < symtab_hdr->sh_info)
9554 indx = r_symndx - symtab_hdr->sh_info;
9555 h = elf_sym_hashes (abfd)[indx];
9556 while (h->root.type == bfd_link_hash_indirect
9557 || h->root.type == bfd_link_hash_warning)
9558 h = (struct elf_link_hash_entry *) h->root.u.i.link;
9563 /* Get the section-relative offset for a symbol number. */
9566 get_elf_r_symndx_offset (bfd *abfd, unsigned long r_symndx)
9568 Elf_Internal_Shdr *symtab_hdr = &elf_tdata (abfd)->symtab_hdr;
9571 if (r_symndx < symtab_hdr->sh_info)
9573 Elf_Internal_Sym *isymbuf;
9574 isymbuf = retrieve_local_syms (abfd);
9575 offset = isymbuf[r_symndx].st_value;
9579 unsigned long indx = r_symndx - symtab_hdr->sh_info;
9580 struct elf_link_hash_entry *h =
9581 elf_sym_hashes (abfd)[indx];
9583 while (h->root.type == bfd_link_hash_indirect
9584 || h->root.type == bfd_link_hash_warning)
9585 h = (struct elf_link_hash_entry *) h->root.u.i.link;
9586 if (h->root.type == bfd_link_hash_defined
9587 || h->root.type == bfd_link_hash_defweak)
9588 offset = h->root.u.def.value;
9595 is_reloc_sym_weak (bfd *abfd, Elf_Internal_Rela *rel)
9597 unsigned long r_symndx = ELF32_R_SYM (rel->r_info);
9598 struct elf_link_hash_entry *h;
9600 h = get_elf_r_symndx_hash_entry (abfd, r_symndx);
9601 if (h && h->root.type == bfd_link_hash_defweak)
9608 pcrel_reloc_fits (xtensa_opcode opc,
9610 bfd_vma self_address,
9611 bfd_vma dest_address)
9613 xtensa_isa isa = xtensa_default_isa;
9614 uint32 valp = dest_address;
9615 if (xtensa_operand_do_reloc (isa, opc, opnd, &valp, self_address)
9616 || xtensa_operand_encode (isa, opc, opnd, &valp))
9623 xtensa_is_property_section (asection *sec)
9625 if (xtensa_is_insntable_section (sec)
9626 || xtensa_is_littable_section (sec)
9627 || xtensa_is_proptable_section (sec))
9635 xtensa_is_insntable_section (asection *sec)
9637 if (CONST_STRNEQ (sec->name, XTENSA_INSN_SEC_NAME)
9638 || CONST_STRNEQ (sec->name, ".gnu.linkonce.x."))
9646 xtensa_is_littable_section (asection *sec)
9648 if (CONST_STRNEQ (sec->name, XTENSA_LIT_SEC_NAME)
9649 || CONST_STRNEQ (sec->name, ".gnu.linkonce.p."))
9657 xtensa_is_proptable_section (asection *sec)
9659 if (CONST_STRNEQ (sec->name, XTENSA_PROP_SEC_NAME)
9660 || CONST_STRNEQ (sec->name, ".gnu.linkonce.prop."))
9668 internal_reloc_compare (const void *ap, const void *bp)
9670 const Elf_Internal_Rela *a = (const Elf_Internal_Rela *) ap;
9671 const Elf_Internal_Rela *b = (const Elf_Internal_Rela *) bp;
9673 if (a->r_offset != b->r_offset)
9674 return (a->r_offset - b->r_offset);
9676 /* We don't need to sort on these criteria for correctness,
9677 but enforcing a more strict ordering prevents unstable qsort
9678 from behaving differently with different implementations.
9679 Without the code below we get correct but different results
9680 on Solaris 2.7 and 2.8. We would like to always produce the
9681 same results no matter the host. */
9683 if (a->r_info != b->r_info)
9684 return (a->r_info - b->r_info);
9686 return (a->r_addend - b->r_addend);
9691 internal_reloc_matches (const void *ap, const void *bp)
9693 const Elf_Internal_Rela *a = (const Elf_Internal_Rela *) ap;
9694 const Elf_Internal_Rela *b = (const Elf_Internal_Rela *) bp;
9696 /* Check if one entry overlaps with the other; this shouldn't happen
9697 except when searching for a match. */
9698 return (a->r_offset - b->r_offset);
9702 /* Predicate function used to look up a section in a particular group. */
9705 match_section_group (bfd *abfd ATTRIBUTE_UNUSED, asection *sec, void *inf)
9707 const char *gname = inf;
9708 const char *group_name = elf_group_name (sec);
9710 return (group_name == gname
9711 || (group_name != NULL
9713 && strcmp (group_name, gname) == 0));
9717 static int linkonce_len = sizeof (".gnu.linkonce.") - 1;
9720 xtensa_get_property_section (asection *sec, const char *base_name)
9722 const char *suffix, *group_name;
9723 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 /* Check if the section already exists. */
9767 prop_sec = bfd_get_section_by_name_if (sec->owner, prop_sec_name,
9768 match_section_group,
9769 (void *) group_name);
9770 /* If not, create it. */
9773 flagword flags = (SEC_RELOC | SEC_HAS_CONTENTS | SEC_READONLY);
9774 flags |= (bfd_get_section_flags (sec->owner, sec)
9775 & (SEC_LINK_ONCE | SEC_LINK_DUPLICATES));
9777 prop_sec = bfd_make_section_anyway_with_flags
9778 (sec->owner, strdup (prop_sec_name), flags);
9782 elf_group_name (prop_sec) = group_name;
9785 free (prop_sec_name);
9791 xtensa_get_property_predef_flags (asection *sec)
9793 if (xtensa_is_insntable_section (sec))
9794 return (XTENSA_PROP_INSN
9795 | XTENSA_PROP_NO_TRANSFORM
9796 | XTENSA_PROP_INSN_NO_REORDER);
9798 if (xtensa_is_littable_section (sec))
9799 return (XTENSA_PROP_LITERAL
9800 | XTENSA_PROP_NO_TRANSFORM
9801 | XTENSA_PROP_INSN_NO_REORDER);
9807 /* Other functions called directly by the linker. */
9810 xtensa_callback_required_dependence (bfd *abfd,
9812 struct bfd_link_info *link_info,
9813 deps_callback_t callback,
9816 Elf_Internal_Rela *internal_relocs;
9819 bfd_boolean ok = TRUE;
9820 bfd_size_type sec_size;
9822 sec_size = bfd_get_section_limit (abfd, sec);
9824 /* ".plt*" sections have no explicit relocations but they contain L32R
9825 instructions that reference the corresponding ".got.plt*" sections. */
9826 if ((sec->flags & SEC_LINKER_CREATED) != 0
9827 && CONST_STRNEQ (sec->name, ".plt"))
9831 /* Find the corresponding ".got.plt*" section. */
9832 if (sec->name[4] == '\0')
9833 sgotplt = bfd_get_section_by_name (sec->owner, ".got.plt");
9839 BFD_ASSERT (sec->name[4] == '.');
9840 chunk = strtol (&sec->name[5], NULL, 10);
9842 sprintf (got_name, ".got.plt.%u", chunk);
9843 sgotplt = bfd_get_section_by_name (sec->owner, got_name);
9845 BFD_ASSERT (sgotplt);
9847 /* Assume worst-case offsets: L32R at the very end of the ".plt"
9848 section referencing a literal at the very beginning of
9849 ".got.plt". This is very close to the real dependence, anyway. */
9850 (*callback) (sec, sec_size, sgotplt, 0, closure);
9853 /* Only ELF files are supported for Xtensa. Check here to avoid a segfault
9854 when building uclibc, which runs "ld -b binary /dev/null". */
9855 if (bfd_get_flavour (abfd) != bfd_target_elf_flavour)
9858 internal_relocs = retrieve_internal_relocs (abfd, sec,
9859 link_info->keep_memory);
9860 if (internal_relocs == NULL
9861 || sec->reloc_count == 0)
9864 /* Cache the contents for the duration of this scan. */
9865 contents = retrieve_contents (abfd, sec, link_info->keep_memory);
9866 if (contents == NULL && sec_size != 0)
9872 if (!xtensa_default_isa)
9873 xtensa_default_isa = xtensa_isa_init (0, 0);
9875 for (i = 0; i < sec->reloc_count; i++)
9877 Elf_Internal_Rela *irel = &internal_relocs[i];
9878 if (is_l32r_relocation (abfd, sec, contents, irel))
9881 asection *target_sec;
9882 bfd_vma target_offset;
9884 r_reloc_init (&l32r_rel, abfd, irel, contents, sec_size);
9887 /* L32Rs must be local to the input file. */
9888 if (r_reloc_is_defined (&l32r_rel))
9890 target_sec = r_reloc_get_section (&l32r_rel);
9891 target_offset = l32r_rel.target_offset;
9893 (*callback) (sec, irel->r_offset, target_sec, target_offset,
9899 release_internal_relocs (sec, internal_relocs);
9900 release_contents (sec, contents);
9904 /* The default literal sections should always be marked as "code" (i.e.,
9905 SHF_EXECINSTR). This is particularly important for the Linux kernel
9906 module loader so that the literals are not placed after the text. */
9907 static const struct bfd_elf_special_section elf_xtensa_special_sections[] =
9909 { STRING_COMMA_LEN (".fini.literal"), 0, SHT_PROGBITS, SHF_ALLOC + SHF_EXECINSTR },
9910 { STRING_COMMA_LEN (".init.literal"), 0, SHT_PROGBITS, SHF_ALLOC + SHF_EXECINSTR },
9911 { STRING_COMMA_LEN (".literal"), 0, SHT_PROGBITS, SHF_ALLOC + SHF_EXECINSTR },
9912 { STRING_COMMA_LEN (".xtensa.info"), 0, SHT_NOTE, 0 },
9913 { NULL, 0, 0, 0, 0 }
9917 #define TARGET_LITTLE_SYM bfd_elf32_xtensa_le_vec
9918 #define TARGET_LITTLE_NAME "elf32-xtensa-le"
9919 #define TARGET_BIG_SYM bfd_elf32_xtensa_be_vec
9920 #define TARGET_BIG_NAME "elf32-xtensa-be"
9921 #define ELF_ARCH bfd_arch_xtensa
9923 #define ELF_MACHINE_CODE EM_XTENSA
9924 #define ELF_MACHINE_ALT1 EM_XTENSA_OLD
9927 #define ELF_MAXPAGESIZE (1 << XCHAL_MMU_MIN_PTE_PAGE_SIZE)
9928 #else /* !XCHAL_HAVE_MMU */
9929 #define ELF_MAXPAGESIZE 1
9930 #endif /* !XCHAL_HAVE_MMU */
9931 #endif /* ELF_ARCH */
9933 #define elf_backend_can_gc_sections 1
9934 #define elf_backend_can_refcount 1
9935 #define elf_backend_plt_readonly 1
9936 #define elf_backend_got_header_size 4
9937 #define elf_backend_want_dynbss 0
9938 #define elf_backend_want_got_plt 1
9940 #define elf_info_to_howto elf_xtensa_info_to_howto_rela
9942 #define bfd_elf32_bfd_merge_private_bfd_data elf_xtensa_merge_private_bfd_data
9943 #define bfd_elf32_new_section_hook elf_xtensa_new_section_hook
9944 #define bfd_elf32_bfd_print_private_bfd_data elf_xtensa_print_private_bfd_data
9945 #define bfd_elf32_bfd_relax_section elf_xtensa_relax_section
9946 #define bfd_elf32_bfd_reloc_type_lookup elf_xtensa_reloc_type_lookup
9947 #define bfd_elf32_bfd_reloc_name_lookup \
9948 elf_xtensa_reloc_name_lookup
9949 #define bfd_elf32_bfd_set_private_flags elf_xtensa_set_private_flags
9950 #define bfd_elf32_bfd_link_hash_table_create elf_xtensa_link_hash_table_create
9952 #define elf_backend_adjust_dynamic_symbol elf_xtensa_adjust_dynamic_symbol
9953 #define elf_backend_check_relocs elf_xtensa_check_relocs
9954 #define elf_backend_create_dynamic_sections elf_xtensa_create_dynamic_sections
9955 #define elf_backend_discard_info elf_xtensa_discard_info
9956 #define elf_backend_ignore_discarded_relocs elf_xtensa_ignore_discarded_relocs
9957 #define elf_backend_final_write_processing elf_xtensa_final_write_processing
9958 #define elf_backend_finish_dynamic_sections elf_xtensa_finish_dynamic_sections
9959 #define elf_backend_finish_dynamic_symbol elf_xtensa_finish_dynamic_symbol
9960 #define elf_backend_gc_mark_hook elf_xtensa_gc_mark_hook
9961 #define elf_backend_gc_sweep_hook elf_xtensa_gc_sweep_hook
9962 #define elf_backend_grok_prstatus elf_xtensa_grok_prstatus
9963 #define elf_backend_grok_psinfo elf_xtensa_grok_psinfo
9964 #define elf_backend_hide_symbol elf_xtensa_hide_symbol
9965 #define elf_backend_object_p elf_xtensa_object_p
9966 #define elf_backend_reloc_type_class elf_xtensa_reloc_type_class
9967 #define elf_backend_relocate_section elf_xtensa_relocate_section
9968 #define elf_backend_size_dynamic_sections elf_xtensa_size_dynamic_sections
9969 #define elf_backend_omit_section_dynsym \
9970 ((bfd_boolean (*) (bfd *, struct bfd_link_info *, asection *)) bfd_true)
9971 #define elf_backend_special_sections elf_xtensa_special_sections
9972 #define elf_backend_action_discarded elf_xtensa_action_discarded
9974 #include "elf32-target.h"