1 /* Xtensa-specific support for 32-bit ELF.
2 Copyright 2003, 2004, 2005, 2006, 2007 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),
207 /* GNU extension to record C++ vtable hierarchy. */
208 HOWTO (R_XTENSA_GNU_VTINHERIT, 0, 2, 0, FALSE, 0, complain_overflow_dont,
209 NULL, "R_XTENSA_GNU_VTINHERIT",
211 /* GNU extension to record C++ vtable member usage. */
212 HOWTO (R_XTENSA_GNU_VTENTRY, 0, 2, 0, FALSE, 0, complain_overflow_dont,
213 _bfd_elf_rel_vtable_reloc_fn, "R_XTENSA_GNU_VTENTRY",
216 /* Relocations for supporting difference of symbols. */
217 HOWTO (R_XTENSA_DIFF8, 0, 0, 8, FALSE, 0, complain_overflow_bitfield,
218 bfd_elf_xtensa_reloc, "R_XTENSA_DIFF8", FALSE, 0, 0xff, FALSE),
219 HOWTO (R_XTENSA_DIFF16, 0, 1, 16, FALSE, 0, complain_overflow_bitfield,
220 bfd_elf_xtensa_reloc, "R_XTENSA_DIFF16", FALSE, 0, 0xffff, FALSE),
221 HOWTO (R_XTENSA_DIFF32, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
222 bfd_elf_xtensa_reloc, "R_XTENSA_DIFF32", FALSE, 0, 0xffffffff, FALSE),
224 /* General immediate operand relocations. */
225 HOWTO (R_XTENSA_SLOT0_OP, 0, 0, 0, TRUE, 0, complain_overflow_dont,
226 bfd_elf_xtensa_reloc, "R_XTENSA_SLOT0_OP", FALSE, 0, 0, TRUE),
227 HOWTO (R_XTENSA_SLOT1_OP, 0, 0, 0, TRUE, 0, complain_overflow_dont,
228 bfd_elf_xtensa_reloc, "R_XTENSA_SLOT1_OP", FALSE, 0, 0, TRUE),
229 HOWTO (R_XTENSA_SLOT2_OP, 0, 0, 0, TRUE, 0, complain_overflow_dont,
230 bfd_elf_xtensa_reloc, "R_XTENSA_SLOT2_OP", FALSE, 0, 0, TRUE),
231 HOWTO (R_XTENSA_SLOT3_OP, 0, 0, 0, TRUE, 0, complain_overflow_dont,
232 bfd_elf_xtensa_reloc, "R_XTENSA_SLOT3_OP", FALSE, 0, 0, TRUE),
233 HOWTO (R_XTENSA_SLOT4_OP, 0, 0, 0, TRUE, 0, complain_overflow_dont,
234 bfd_elf_xtensa_reloc, "R_XTENSA_SLOT4_OP", FALSE, 0, 0, TRUE),
235 HOWTO (R_XTENSA_SLOT5_OP, 0, 0, 0, TRUE, 0, complain_overflow_dont,
236 bfd_elf_xtensa_reloc, "R_XTENSA_SLOT5_OP", FALSE, 0, 0, TRUE),
237 HOWTO (R_XTENSA_SLOT6_OP, 0, 0, 0, TRUE, 0, complain_overflow_dont,
238 bfd_elf_xtensa_reloc, "R_XTENSA_SLOT6_OP", FALSE, 0, 0, TRUE),
239 HOWTO (R_XTENSA_SLOT7_OP, 0, 0, 0, TRUE, 0, complain_overflow_dont,
240 bfd_elf_xtensa_reloc, "R_XTENSA_SLOT7_OP", FALSE, 0, 0, TRUE),
241 HOWTO (R_XTENSA_SLOT8_OP, 0, 0, 0, TRUE, 0, complain_overflow_dont,
242 bfd_elf_xtensa_reloc, "R_XTENSA_SLOT8_OP", FALSE, 0, 0, TRUE),
243 HOWTO (R_XTENSA_SLOT9_OP, 0, 0, 0, TRUE, 0, complain_overflow_dont,
244 bfd_elf_xtensa_reloc, "R_XTENSA_SLOT9_OP", FALSE, 0, 0, TRUE),
245 HOWTO (R_XTENSA_SLOT10_OP, 0, 0, 0, TRUE, 0, complain_overflow_dont,
246 bfd_elf_xtensa_reloc, "R_XTENSA_SLOT10_OP", FALSE, 0, 0, TRUE),
247 HOWTO (R_XTENSA_SLOT11_OP, 0, 0, 0, TRUE, 0, complain_overflow_dont,
248 bfd_elf_xtensa_reloc, "R_XTENSA_SLOT11_OP", FALSE, 0, 0, TRUE),
249 HOWTO (R_XTENSA_SLOT12_OP, 0, 0, 0, TRUE, 0, complain_overflow_dont,
250 bfd_elf_xtensa_reloc, "R_XTENSA_SLOT12_OP", FALSE, 0, 0, TRUE),
251 HOWTO (R_XTENSA_SLOT13_OP, 0, 0, 0, TRUE, 0, complain_overflow_dont,
252 bfd_elf_xtensa_reloc, "R_XTENSA_SLOT13_OP", FALSE, 0, 0, TRUE),
253 HOWTO (R_XTENSA_SLOT14_OP, 0, 0, 0, TRUE, 0, complain_overflow_dont,
254 bfd_elf_xtensa_reloc, "R_XTENSA_SLOT14_OP", FALSE, 0, 0, TRUE),
256 /* "Alternate" relocations. The meaning of these is opcode-specific. */
257 HOWTO (R_XTENSA_SLOT0_ALT, 0, 0, 0, TRUE, 0, complain_overflow_dont,
258 bfd_elf_xtensa_reloc, "R_XTENSA_SLOT0_ALT", FALSE, 0, 0, TRUE),
259 HOWTO (R_XTENSA_SLOT1_ALT, 0, 0, 0, TRUE, 0, complain_overflow_dont,
260 bfd_elf_xtensa_reloc, "R_XTENSA_SLOT1_ALT", FALSE, 0, 0, TRUE),
261 HOWTO (R_XTENSA_SLOT2_ALT, 0, 0, 0, TRUE, 0, complain_overflow_dont,
262 bfd_elf_xtensa_reloc, "R_XTENSA_SLOT2_ALT", FALSE, 0, 0, TRUE),
263 HOWTO (R_XTENSA_SLOT3_ALT, 0, 0, 0, TRUE, 0, complain_overflow_dont,
264 bfd_elf_xtensa_reloc, "R_XTENSA_SLOT3_ALT", FALSE, 0, 0, TRUE),
265 HOWTO (R_XTENSA_SLOT4_ALT, 0, 0, 0, TRUE, 0, complain_overflow_dont,
266 bfd_elf_xtensa_reloc, "R_XTENSA_SLOT4_ALT", FALSE, 0, 0, TRUE),
267 HOWTO (R_XTENSA_SLOT5_ALT, 0, 0, 0, TRUE, 0, complain_overflow_dont,
268 bfd_elf_xtensa_reloc, "R_XTENSA_SLOT5_ALT", FALSE, 0, 0, TRUE),
269 HOWTO (R_XTENSA_SLOT6_ALT, 0, 0, 0, TRUE, 0, complain_overflow_dont,
270 bfd_elf_xtensa_reloc, "R_XTENSA_SLOT6_ALT", FALSE, 0, 0, TRUE),
271 HOWTO (R_XTENSA_SLOT7_ALT, 0, 0, 0, TRUE, 0, complain_overflow_dont,
272 bfd_elf_xtensa_reloc, "R_XTENSA_SLOT7_ALT", FALSE, 0, 0, TRUE),
273 HOWTO (R_XTENSA_SLOT8_ALT, 0, 0, 0, TRUE, 0, complain_overflow_dont,
274 bfd_elf_xtensa_reloc, "R_XTENSA_SLOT8_ALT", FALSE, 0, 0, TRUE),
275 HOWTO (R_XTENSA_SLOT9_ALT, 0, 0, 0, TRUE, 0, complain_overflow_dont,
276 bfd_elf_xtensa_reloc, "R_XTENSA_SLOT9_ALT", FALSE, 0, 0, TRUE),
277 HOWTO (R_XTENSA_SLOT10_ALT, 0, 0, 0, TRUE, 0, complain_overflow_dont,
278 bfd_elf_xtensa_reloc, "R_XTENSA_SLOT10_ALT", FALSE, 0, 0, TRUE),
279 HOWTO (R_XTENSA_SLOT11_ALT, 0, 0, 0, TRUE, 0, complain_overflow_dont,
280 bfd_elf_xtensa_reloc, "R_XTENSA_SLOT11_ALT", FALSE, 0, 0, TRUE),
281 HOWTO (R_XTENSA_SLOT12_ALT, 0, 0, 0, TRUE, 0, complain_overflow_dont,
282 bfd_elf_xtensa_reloc, "R_XTENSA_SLOT12_ALT", FALSE, 0, 0, TRUE),
283 HOWTO (R_XTENSA_SLOT13_ALT, 0, 0, 0, TRUE, 0, complain_overflow_dont,
284 bfd_elf_xtensa_reloc, "R_XTENSA_SLOT13_ALT", FALSE, 0, 0, TRUE),
285 HOWTO (R_XTENSA_SLOT14_ALT, 0, 0, 0, TRUE, 0, complain_overflow_dont,
286 bfd_elf_xtensa_reloc, "R_XTENSA_SLOT14_ALT", FALSE, 0, 0, TRUE),
291 fprintf (stderr, "Xtensa bfd reloc lookup %d (%s)\n", code, str)
296 static reloc_howto_type *
297 elf_xtensa_reloc_type_lookup (bfd *abfd ATTRIBUTE_UNUSED,
298 bfd_reloc_code_real_type code)
303 TRACE ("BFD_RELOC_NONE");
304 return &elf_howto_table[(unsigned) R_XTENSA_NONE ];
307 TRACE ("BFD_RELOC_32");
308 return &elf_howto_table[(unsigned) R_XTENSA_32 ];
310 case BFD_RELOC_XTENSA_DIFF8:
311 TRACE ("BFD_RELOC_XTENSA_DIFF8");
312 return &elf_howto_table[(unsigned) R_XTENSA_DIFF8 ];
314 case BFD_RELOC_XTENSA_DIFF16:
315 TRACE ("BFD_RELOC_XTENSA_DIFF16");
316 return &elf_howto_table[(unsigned) R_XTENSA_DIFF16 ];
318 case BFD_RELOC_XTENSA_DIFF32:
319 TRACE ("BFD_RELOC_XTENSA_DIFF32");
320 return &elf_howto_table[(unsigned) R_XTENSA_DIFF32 ];
322 case BFD_RELOC_XTENSA_RTLD:
323 TRACE ("BFD_RELOC_XTENSA_RTLD");
324 return &elf_howto_table[(unsigned) R_XTENSA_RTLD ];
326 case BFD_RELOC_XTENSA_GLOB_DAT:
327 TRACE ("BFD_RELOC_XTENSA_GLOB_DAT");
328 return &elf_howto_table[(unsigned) R_XTENSA_GLOB_DAT ];
330 case BFD_RELOC_XTENSA_JMP_SLOT:
331 TRACE ("BFD_RELOC_XTENSA_JMP_SLOT");
332 return &elf_howto_table[(unsigned) R_XTENSA_JMP_SLOT ];
334 case BFD_RELOC_XTENSA_RELATIVE:
335 TRACE ("BFD_RELOC_XTENSA_RELATIVE");
336 return &elf_howto_table[(unsigned) R_XTENSA_RELATIVE ];
338 case BFD_RELOC_XTENSA_PLT:
339 TRACE ("BFD_RELOC_XTENSA_PLT");
340 return &elf_howto_table[(unsigned) R_XTENSA_PLT ];
342 case BFD_RELOC_XTENSA_OP0:
343 TRACE ("BFD_RELOC_XTENSA_OP0");
344 return &elf_howto_table[(unsigned) R_XTENSA_OP0 ];
346 case BFD_RELOC_XTENSA_OP1:
347 TRACE ("BFD_RELOC_XTENSA_OP1");
348 return &elf_howto_table[(unsigned) R_XTENSA_OP1 ];
350 case BFD_RELOC_XTENSA_OP2:
351 TRACE ("BFD_RELOC_XTENSA_OP2");
352 return &elf_howto_table[(unsigned) R_XTENSA_OP2 ];
354 case BFD_RELOC_XTENSA_ASM_EXPAND:
355 TRACE ("BFD_RELOC_XTENSA_ASM_EXPAND");
356 return &elf_howto_table[(unsigned) R_XTENSA_ASM_EXPAND ];
358 case BFD_RELOC_XTENSA_ASM_SIMPLIFY:
359 TRACE ("BFD_RELOC_XTENSA_ASM_SIMPLIFY");
360 return &elf_howto_table[(unsigned) R_XTENSA_ASM_SIMPLIFY ];
362 case BFD_RELOC_VTABLE_INHERIT:
363 TRACE ("BFD_RELOC_VTABLE_INHERIT");
364 return &elf_howto_table[(unsigned) R_XTENSA_GNU_VTINHERIT ];
366 case BFD_RELOC_VTABLE_ENTRY:
367 TRACE ("BFD_RELOC_VTABLE_ENTRY");
368 return &elf_howto_table[(unsigned) R_XTENSA_GNU_VTENTRY ];
371 if (code >= BFD_RELOC_XTENSA_SLOT0_OP
372 && code <= BFD_RELOC_XTENSA_SLOT14_OP)
374 unsigned n = (R_XTENSA_SLOT0_OP +
375 (code - BFD_RELOC_XTENSA_SLOT0_OP));
376 return &elf_howto_table[n];
379 if (code >= BFD_RELOC_XTENSA_SLOT0_ALT
380 && code <= BFD_RELOC_XTENSA_SLOT14_ALT)
382 unsigned n = (R_XTENSA_SLOT0_ALT +
383 (code - BFD_RELOC_XTENSA_SLOT0_ALT));
384 return &elf_howto_table[n];
394 static reloc_howto_type *
395 elf_xtensa_reloc_name_lookup (bfd *abfd ATTRIBUTE_UNUSED,
400 for (i = 0; i < sizeof (elf_howto_table) / sizeof (elf_howto_table[0]); i++)
401 if (elf_howto_table[i].name != NULL
402 && strcasecmp (elf_howto_table[i].name, r_name) == 0)
403 return &elf_howto_table[i];
409 /* Given an ELF "rela" relocation, find the corresponding howto and record
410 it in the BFD internal arelent representation of the relocation. */
413 elf_xtensa_info_to_howto_rela (bfd *abfd ATTRIBUTE_UNUSED,
415 Elf_Internal_Rela *dst)
417 unsigned int r_type = ELF32_R_TYPE (dst->r_info);
419 BFD_ASSERT (r_type < (unsigned int) R_XTENSA_max);
420 cache_ptr->howto = &elf_howto_table[r_type];
424 /* Functions for the Xtensa ELF linker. */
426 /* The name of the dynamic interpreter. This is put in the .interp
429 #define ELF_DYNAMIC_INTERPRETER "/lib/ld.so"
431 /* The size in bytes of an entry in the procedure linkage table.
432 (This does _not_ include the space for the literals associated with
435 #define PLT_ENTRY_SIZE 16
437 /* For _really_ large PLTs, we may need to alternate between literals
438 and code to keep the literals within the 256K range of the L32R
439 instructions in the code. It's unlikely that anyone would ever need
440 such a big PLT, but an arbitrary limit on the PLT size would be bad.
441 Thus, we split the PLT into chunks. Since there's very little
442 overhead (2 extra literals) for each chunk, the chunk size is kept
443 small so that the code for handling multiple chunks get used and
444 tested regularly. With 254 entries, there are 1K of literals for
445 each chunk, and that seems like a nice round number. */
447 #define PLT_ENTRIES_PER_CHUNK 254
449 /* PLT entries are actually used as stub functions for lazy symbol
450 resolution. Once the symbol is resolved, the stub function is never
451 invoked. Note: the 32-byte frame size used here cannot be changed
452 without a corresponding change in the runtime linker. */
454 static const bfd_byte elf_xtensa_be_plt_entry[PLT_ENTRY_SIZE] =
456 0x6c, 0x10, 0x04, /* entry sp, 32 */
457 0x18, 0x00, 0x00, /* l32r a8, [got entry for rtld's resolver] */
458 0x1a, 0x00, 0x00, /* l32r a10, [got entry for rtld's link map] */
459 0x1b, 0x00, 0x00, /* l32r a11, [literal for reloc index] */
460 0x0a, 0x80, 0x00, /* jx a8 */
464 static const bfd_byte elf_xtensa_le_plt_entry[PLT_ENTRY_SIZE] =
466 0x36, 0x41, 0x00, /* entry sp, 32 */
467 0x81, 0x00, 0x00, /* l32r a8, [got entry for rtld's resolver] */
468 0xa1, 0x00, 0x00, /* l32r a10, [got entry for rtld's link map] */
469 0xb1, 0x00, 0x00, /* l32r a11, [literal for reloc index] */
470 0xa0, 0x08, 0x00, /* jx a8 */
474 /* Xtensa ELF linker hash table. */
476 struct elf_xtensa_link_hash_table
478 struct elf_link_hash_table elf;
480 /* Short-cuts to get to dynamic linker sections. */
487 asection *spltlittbl;
489 /* Total count of PLT relocations seen during check_relocs.
490 The actual PLT code must be split into multiple sections and all
491 the sections have to be created before size_dynamic_sections,
492 where we figure out the exact number of PLT entries that will be
493 needed. It is OK if this count is an overestimate, e.g., some
494 relocations may be removed by GC. */
498 /* Get the Xtensa ELF linker hash table from a link_info structure. */
500 #define elf_xtensa_hash_table(p) \
501 ((struct elf_xtensa_link_hash_table *) ((p)->hash))
503 /* Create an Xtensa ELF linker hash table. */
505 static struct bfd_link_hash_table *
506 elf_xtensa_link_hash_table_create (bfd *abfd)
508 struct elf_xtensa_link_hash_table *ret;
509 bfd_size_type amt = sizeof (struct elf_xtensa_link_hash_table);
511 ret = bfd_malloc (amt);
515 if (!_bfd_elf_link_hash_table_init (&ret->elf, abfd,
516 _bfd_elf_link_hash_newfunc,
517 sizeof (struct elf_link_hash_entry)))
529 ret->spltlittbl = NULL;
531 ret->plt_reloc_count = 0;
533 return &ret->elf.root;
536 static inline bfd_boolean
537 elf_xtensa_dynamic_symbol_p (struct elf_link_hash_entry *h,
538 struct bfd_link_info *info)
540 /* Check if we should do dynamic things to this symbol. The
541 "ignore_protected" argument need not be set, because Xtensa code
542 does not require special handling of STV_PROTECTED to make function
543 pointer comparisons work properly. The PLT addresses are never
544 used for function pointers. */
546 return _bfd_elf_dynamic_symbol_p (h, info, 0);
551 property_table_compare (const void *ap, const void *bp)
553 const property_table_entry *a = (const property_table_entry *) ap;
554 const property_table_entry *b = (const property_table_entry *) bp;
556 if (a->address == b->address)
558 if (a->size != b->size)
559 return (a->size - b->size);
561 if ((a->flags & XTENSA_PROP_ALIGN) != (b->flags & XTENSA_PROP_ALIGN))
562 return ((b->flags & XTENSA_PROP_ALIGN)
563 - (a->flags & XTENSA_PROP_ALIGN));
565 if ((a->flags & XTENSA_PROP_ALIGN)
566 && (GET_XTENSA_PROP_ALIGNMENT (a->flags)
567 != GET_XTENSA_PROP_ALIGNMENT (b->flags)))
568 return (GET_XTENSA_PROP_ALIGNMENT (a->flags)
569 - GET_XTENSA_PROP_ALIGNMENT (b->flags));
571 if ((a->flags & XTENSA_PROP_UNREACHABLE)
572 != (b->flags & XTENSA_PROP_UNREACHABLE))
573 return ((b->flags & XTENSA_PROP_UNREACHABLE)
574 - (a->flags & XTENSA_PROP_UNREACHABLE));
576 return (a->flags - b->flags);
579 return (a->address - b->address);
584 property_table_matches (const void *ap, const void *bp)
586 const property_table_entry *a = (const property_table_entry *) ap;
587 const property_table_entry *b = (const property_table_entry *) bp;
589 /* Check if one entry overlaps with the other. */
590 if ((b->address >= a->address && b->address < (a->address + a->size))
591 || (a->address >= b->address && a->address < (b->address + b->size)))
594 return (a->address - b->address);
598 /* Get the literal table or property table entries for the given
599 section. Sets TABLE_P and returns the number of entries. On
600 error, returns a negative value. */
603 xtensa_read_table_entries (bfd *abfd,
605 property_table_entry **table_p,
606 const char *sec_name,
607 bfd_boolean output_addr)
609 asection *table_section;
610 bfd_size_type table_size = 0;
611 bfd_byte *table_data;
612 property_table_entry *blocks;
613 int blk, block_count;
614 bfd_size_type num_records;
615 Elf_Internal_Rela *internal_relocs, *irel, *rel_end;
616 bfd_vma section_addr, off;
617 flagword predef_flags;
618 bfd_size_type table_entry_size, section_limit;
621 || !(section->flags & SEC_ALLOC)
622 || (section->flags & SEC_DEBUGGING))
628 table_section = xtensa_get_property_section (section, sec_name);
630 table_size = table_section->size;
638 predef_flags = xtensa_get_property_predef_flags (table_section);
639 table_entry_size = 12;
641 table_entry_size -= 4;
643 num_records = table_size / table_entry_size;
644 table_data = retrieve_contents (abfd, table_section, TRUE);
645 blocks = (property_table_entry *)
646 bfd_malloc (num_records * sizeof (property_table_entry));
650 section_addr = section->output_section->vma + section->output_offset;
652 section_addr = section->vma;
654 internal_relocs = retrieve_internal_relocs (abfd, table_section, TRUE);
655 if (internal_relocs && !table_section->reloc_done)
657 qsort (internal_relocs, table_section->reloc_count,
658 sizeof (Elf_Internal_Rela), internal_reloc_compare);
659 irel = internal_relocs;
664 section_limit = bfd_get_section_limit (abfd, section);
665 rel_end = internal_relocs + table_section->reloc_count;
667 for (off = 0; off < table_size; off += table_entry_size)
669 bfd_vma address = bfd_get_32 (abfd, table_data + off);
671 /* Skip any relocations before the current offset. This should help
672 avoid confusion caused by unexpected relocations for the preceding
675 (irel->r_offset < off
676 || (irel->r_offset == off
677 && ELF32_R_TYPE (irel->r_info) == R_XTENSA_NONE)))
684 if (irel && irel->r_offset == off)
687 unsigned long r_symndx = ELF32_R_SYM (irel->r_info);
688 BFD_ASSERT (ELF32_R_TYPE (irel->r_info) == R_XTENSA_32);
690 if (get_elf_r_symndx_section (abfd, r_symndx) != section)
693 sym_off = get_elf_r_symndx_offset (abfd, r_symndx);
694 BFD_ASSERT (sym_off == 0);
695 address += (section_addr + sym_off + irel->r_addend);
699 if (address < section_addr
700 || address >= section_addr + section_limit)
704 blocks[block_count].address = address;
705 blocks[block_count].size = bfd_get_32 (abfd, table_data + off + 4);
707 blocks[block_count].flags = predef_flags;
709 blocks[block_count].flags = bfd_get_32 (abfd, table_data + off + 8);
713 release_contents (table_section, table_data);
714 release_internal_relocs (table_section, internal_relocs);
718 /* Now sort them into address order for easy reference. */
719 qsort (blocks, block_count, sizeof (property_table_entry),
720 property_table_compare);
722 /* Check that the table contents are valid. Problems may occur,
723 for example, if an unrelocated object file is stripped. */
724 for (blk = 1; blk < block_count; blk++)
726 /* The only circumstance where two entries may legitimately
727 have the same address is when one of them is a zero-size
728 placeholder to mark a place where fill can be inserted.
729 The zero-size entry should come first. */
730 if (blocks[blk - 1].address == blocks[blk].address &&
731 blocks[blk - 1].size != 0)
733 (*_bfd_error_handler) (_("%B(%A): invalid property table"),
735 bfd_set_error (bfd_error_bad_value);
747 static property_table_entry *
748 elf_xtensa_find_property_entry (property_table_entry *property_table,
749 int property_table_size,
752 property_table_entry entry;
753 property_table_entry *rv;
755 if (property_table_size == 0)
758 entry.address = addr;
762 rv = bsearch (&entry, property_table, property_table_size,
763 sizeof (property_table_entry), property_table_matches);
769 elf_xtensa_in_literal_pool (property_table_entry *lit_table,
773 if (elf_xtensa_find_property_entry (lit_table, lit_table_size, addr))
780 /* Look through the relocs for a section during the first phase, and
781 calculate needed space in the dynamic reloc sections. */
784 elf_xtensa_check_relocs (bfd *abfd,
785 struct bfd_link_info *info,
787 const Elf_Internal_Rela *relocs)
789 struct elf_xtensa_link_hash_table *htab;
790 Elf_Internal_Shdr *symtab_hdr;
791 struct elf_link_hash_entry **sym_hashes;
792 const Elf_Internal_Rela *rel;
793 const Elf_Internal_Rela *rel_end;
795 if (info->relocatable)
798 htab = elf_xtensa_hash_table (info);
799 symtab_hdr = &elf_tdata (abfd)->symtab_hdr;
800 sym_hashes = elf_sym_hashes (abfd);
802 rel_end = relocs + sec->reloc_count;
803 for (rel = relocs; rel < rel_end; rel++)
806 unsigned long r_symndx;
807 struct elf_link_hash_entry *h;
809 r_symndx = ELF32_R_SYM (rel->r_info);
810 r_type = ELF32_R_TYPE (rel->r_info);
812 if (r_symndx >= NUM_SHDR_ENTRIES (symtab_hdr))
814 (*_bfd_error_handler) (_("%B: bad symbol index: %d"),
819 if (r_symndx < symtab_hdr->sh_info)
823 h = sym_hashes[r_symndx - symtab_hdr->sh_info];
824 while (h->root.type == bfd_link_hash_indirect
825 || h->root.type == bfd_link_hash_warning)
826 h = (struct elf_link_hash_entry *) h->root.u.i.link;
835 if ((sec->flags & SEC_ALLOC) != 0)
837 if (h->got.refcount <= 0)
840 h->got.refcount += 1;
845 /* If this relocation is against a local symbol, then it's
846 exactly the same as a normal local GOT entry. */
850 if ((sec->flags & SEC_ALLOC) != 0)
852 if (h->plt.refcount <= 0)
858 h->plt.refcount += 1;
860 /* Keep track of the total PLT relocation count even if we
861 don't yet know whether the dynamic sections will be
863 htab->plt_reloc_count += 1;
865 if (elf_hash_table (info)->dynamic_sections_created)
867 if (! add_extra_plt_sections (info, htab->plt_reloc_count))
874 if ((sec->flags & SEC_ALLOC) != 0)
876 bfd_signed_vma *local_got_refcounts;
878 /* This is a global offset table entry for a local symbol. */
879 local_got_refcounts = elf_local_got_refcounts (abfd);
880 if (local_got_refcounts == NULL)
884 size = symtab_hdr->sh_info;
885 size *= sizeof (bfd_signed_vma);
886 local_got_refcounts =
887 (bfd_signed_vma *) bfd_zalloc (abfd, size);
888 if (local_got_refcounts == NULL)
890 elf_local_got_refcounts (abfd) = local_got_refcounts;
892 local_got_refcounts[r_symndx] += 1;
899 case R_XTENSA_SLOT0_OP:
900 case R_XTENSA_SLOT1_OP:
901 case R_XTENSA_SLOT2_OP:
902 case R_XTENSA_SLOT3_OP:
903 case R_XTENSA_SLOT4_OP:
904 case R_XTENSA_SLOT5_OP:
905 case R_XTENSA_SLOT6_OP:
906 case R_XTENSA_SLOT7_OP:
907 case R_XTENSA_SLOT8_OP:
908 case R_XTENSA_SLOT9_OP:
909 case R_XTENSA_SLOT10_OP:
910 case R_XTENSA_SLOT11_OP:
911 case R_XTENSA_SLOT12_OP:
912 case R_XTENSA_SLOT13_OP:
913 case R_XTENSA_SLOT14_OP:
914 case R_XTENSA_SLOT0_ALT:
915 case R_XTENSA_SLOT1_ALT:
916 case R_XTENSA_SLOT2_ALT:
917 case R_XTENSA_SLOT3_ALT:
918 case R_XTENSA_SLOT4_ALT:
919 case R_XTENSA_SLOT5_ALT:
920 case R_XTENSA_SLOT6_ALT:
921 case R_XTENSA_SLOT7_ALT:
922 case R_XTENSA_SLOT8_ALT:
923 case R_XTENSA_SLOT9_ALT:
924 case R_XTENSA_SLOT10_ALT:
925 case R_XTENSA_SLOT11_ALT:
926 case R_XTENSA_SLOT12_ALT:
927 case R_XTENSA_SLOT13_ALT:
928 case R_XTENSA_SLOT14_ALT:
929 case R_XTENSA_ASM_EXPAND:
930 case R_XTENSA_ASM_SIMPLIFY:
932 case R_XTENSA_DIFF16:
933 case R_XTENSA_DIFF32:
934 /* Nothing to do for these. */
937 case R_XTENSA_GNU_VTINHERIT:
938 /* This relocation describes the C++ object vtable hierarchy.
939 Reconstruct it for later use during GC. */
940 if (!bfd_elf_gc_record_vtinherit (abfd, sec, h, rel->r_offset))
944 case R_XTENSA_GNU_VTENTRY:
945 /* This relocation describes which C++ vtable entries are actually
946 used. Record for later use during GC. */
947 BFD_ASSERT (h != NULL);
949 && !bfd_elf_gc_record_vtentry (abfd, sec, h, rel->r_addend))
963 elf_xtensa_make_sym_local (struct bfd_link_info *info,
964 struct elf_link_hash_entry *h)
968 if (h->plt.refcount > 0)
970 /* For shared objects, there's no need for PLT entries for local
971 symbols (use RELATIVE relocs instead of JMP_SLOT relocs). */
972 if (h->got.refcount < 0)
974 h->got.refcount += h->plt.refcount;
980 /* Don't need any dynamic relocations at all. */
988 elf_xtensa_hide_symbol (struct bfd_link_info *info,
989 struct elf_link_hash_entry *h,
990 bfd_boolean force_local)
992 /* For a shared link, move the plt refcount to the got refcount to leave
993 space for RELATIVE relocs. */
994 elf_xtensa_make_sym_local (info, h);
996 _bfd_elf_link_hash_hide_symbol (info, h, force_local);
1000 /* Return the section that should be marked against GC for a given
1004 elf_xtensa_gc_mark_hook (asection *sec,
1005 struct bfd_link_info *info,
1006 Elf_Internal_Rela *rel,
1007 struct elf_link_hash_entry *h,
1008 Elf_Internal_Sym *sym)
1010 /* Property sections are marked "KEEP" in the linker scripts, but they
1011 should not cause other sections to be marked. (This approach relies
1012 on elf_xtensa_discard_info to remove property table entries that
1013 describe discarded sections. Alternatively, it might be more
1014 efficient to avoid using "KEEP" in the linker scripts and instead use
1015 the gc_mark_extra_sections hook to mark only the property sections
1016 that describe marked sections. That alternative does not work well
1017 with the current property table sections, which do not correspond
1018 one-to-one with the sections they describe, but that should be fixed
1020 if (xtensa_is_property_section (sec))
1024 switch (ELF32_R_TYPE (rel->r_info))
1026 case R_XTENSA_GNU_VTINHERIT:
1027 case R_XTENSA_GNU_VTENTRY:
1031 return _bfd_elf_gc_mark_hook (sec, info, rel, h, sym);
1035 /* Update the GOT & PLT entry reference counts
1036 for the section being removed. */
1039 elf_xtensa_gc_sweep_hook (bfd *abfd,
1040 struct bfd_link_info *info ATTRIBUTE_UNUSED,
1042 const Elf_Internal_Rela *relocs)
1044 Elf_Internal_Shdr *symtab_hdr;
1045 struct elf_link_hash_entry **sym_hashes;
1046 bfd_signed_vma *local_got_refcounts;
1047 const Elf_Internal_Rela *rel, *relend;
1049 if ((sec->flags & SEC_ALLOC) == 0)
1052 symtab_hdr = &elf_tdata (abfd)->symtab_hdr;
1053 sym_hashes = elf_sym_hashes (abfd);
1054 local_got_refcounts = elf_local_got_refcounts (abfd);
1056 relend = relocs + sec->reloc_count;
1057 for (rel = relocs; rel < relend; rel++)
1059 unsigned long r_symndx;
1060 unsigned int r_type;
1061 struct elf_link_hash_entry *h = NULL;
1063 r_symndx = ELF32_R_SYM (rel->r_info);
1064 if (r_symndx >= symtab_hdr->sh_info)
1066 h = sym_hashes[r_symndx - symtab_hdr->sh_info];
1067 while (h->root.type == bfd_link_hash_indirect
1068 || h->root.type == bfd_link_hash_warning)
1069 h = (struct elf_link_hash_entry *) h->root.u.i.link;
1072 r_type = ELF32_R_TYPE (rel->r_info);
1078 if (h->got.refcount > 0)
1085 if (h->plt.refcount > 0)
1090 if (local_got_refcounts[r_symndx] > 0)
1091 local_got_refcounts[r_symndx] -= 1;
1103 /* Create all the dynamic sections. */
1106 elf_xtensa_create_dynamic_sections (bfd *dynobj, struct bfd_link_info *info)
1108 struct elf_xtensa_link_hash_table *htab;
1109 flagword flags, noalloc_flags;
1111 htab = elf_xtensa_hash_table (info);
1113 /* First do all the standard stuff. */
1114 if (! _bfd_elf_create_dynamic_sections (dynobj, info))
1116 htab->splt = bfd_get_section_by_name (dynobj, ".plt");
1117 htab->srelplt = bfd_get_section_by_name (dynobj, ".rela.plt");
1118 htab->sgot = bfd_get_section_by_name (dynobj, ".got");
1119 htab->sgotplt = bfd_get_section_by_name (dynobj, ".got.plt");
1121 /* Create any extra PLT sections in case check_relocs has already
1122 been called on all the non-dynamic input files. */
1123 if (! add_extra_plt_sections (info, htab->plt_reloc_count))
1126 noalloc_flags = (SEC_HAS_CONTENTS | SEC_IN_MEMORY
1127 | SEC_LINKER_CREATED | SEC_READONLY);
1128 flags = noalloc_flags | SEC_ALLOC | SEC_LOAD;
1130 /* Mark the ".got.plt" section READONLY. */
1131 if (htab->sgotplt == NULL
1132 || ! bfd_set_section_flags (dynobj, htab->sgotplt, flags))
1135 /* Create ".rela.got". */
1136 htab->srelgot = bfd_make_section_with_flags (dynobj, ".rela.got", flags);
1137 if (htab->srelgot == NULL
1138 || ! bfd_set_section_alignment (dynobj, htab->srelgot, 2))
1141 /* Create ".got.loc" (literal tables for use by dynamic linker). */
1142 htab->sgotloc = bfd_make_section_with_flags (dynobj, ".got.loc", flags);
1143 if (htab->sgotloc == NULL
1144 || ! bfd_set_section_alignment (dynobj, htab->sgotloc, 2))
1147 /* Create ".xt.lit.plt" (literal table for ".got.plt*"). */
1148 htab->spltlittbl = bfd_make_section_with_flags (dynobj, ".xt.lit.plt",
1150 if (htab->spltlittbl == NULL
1151 || ! bfd_set_section_alignment (dynobj, htab->spltlittbl, 2))
1159 add_extra_plt_sections (struct bfd_link_info *info, int count)
1161 bfd *dynobj = elf_hash_table (info)->dynobj;
1164 /* Iterate over all chunks except 0 which uses the standard ".plt" and
1165 ".got.plt" sections. */
1166 for (chunk = count / PLT_ENTRIES_PER_CHUNK; chunk > 0; chunk--)
1172 /* Stop when we find a section has already been created. */
1173 if (elf_xtensa_get_plt_section (info, chunk))
1176 flags = (SEC_ALLOC | SEC_LOAD | SEC_HAS_CONTENTS | SEC_IN_MEMORY
1177 | SEC_LINKER_CREATED | SEC_READONLY);
1179 sname = (char *) bfd_malloc (10);
1180 sprintf (sname, ".plt.%u", chunk);
1181 s = bfd_make_section_with_flags (dynobj, sname, flags | SEC_CODE);
1183 || ! bfd_set_section_alignment (dynobj, s, 2))
1186 sname = (char *) bfd_malloc (14);
1187 sprintf (sname, ".got.plt.%u", chunk);
1188 s = bfd_make_section_with_flags (dynobj, sname, flags);
1190 || ! bfd_set_section_alignment (dynobj, s, 2))
1198 /* Adjust a symbol defined by a dynamic object and referenced by a
1199 regular object. The current definition is in some section of the
1200 dynamic object, but we're not including those sections. We have to
1201 change the definition to something the rest of the link can
1205 elf_xtensa_adjust_dynamic_symbol (struct bfd_link_info *info ATTRIBUTE_UNUSED,
1206 struct elf_link_hash_entry *h)
1208 /* If this is a weak symbol, and there is a real definition, the
1209 processor independent code will have arranged for us to see the
1210 real definition first, and we can just use the same value. */
1213 BFD_ASSERT (h->u.weakdef->root.type == bfd_link_hash_defined
1214 || h->u.weakdef->root.type == bfd_link_hash_defweak);
1215 h->root.u.def.section = h->u.weakdef->root.u.def.section;
1216 h->root.u.def.value = h->u.weakdef->root.u.def.value;
1220 /* This is a reference to a symbol defined by a dynamic object. The
1221 reference must go through the GOT, so there's no need for COPY relocs,
1229 elf_xtensa_allocate_dynrelocs (struct elf_link_hash_entry *h, void *arg)
1231 struct bfd_link_info *info;
1232 struct elf_xtensa_link_hash_table *htab;
1233 bfd_boolean is_dynamic;
1235 if (h->root.type == bfd_link_hash_indirect)
1238 if (h->root.type == bfd_link_hash_warning)
1239 h = (struct elf_link_hash_entry *) h->root.u.i.link;
1241 info = (struct bfd_link_info *) arg;
1242 htab = elf_xtensa_hash_table (info);
1244 is_dynamic = elf_xtensa_dynamic_symbol_p (h, info);
1247 elf_xtensa_make_sym_local (info, h);
1249 if (h->plt.refcount > 0)
1250 htab->srelplt->size += (h->plt.refcount * sizeof (Elf32_External_Rela));
1252 if (h->got.refcount > 0)
1253 htab->srelgot->size += (h->got.refcount * sizeof (Elf32_External_Rela));
1260 elf_xtensa_allocate_local_got_size (struct bfd_link_info *info)
1262 struct elf_xtensa_link_hash_table *htab;
1265 htab = elf_xtensa_hash_table (info);
1267 for (i = info->input_bfds; i; i = i->link_next)
1269 bfd_signed_vma *local_got_refcounts;
1270 bfd_size_type j, cnt;
1271 Elf_Internal_Shdr *symtab_hdr;
1273 local_got_refcounts = elf_local_got_refcounts (i);
1274 if (!local_got_refcounts)
1277 symtab_hdr = &elf_tdata (i)->symtab_hdr;
1278 cnt = symtab_hdr->sh_info;
1280 for (j = 0; j < cnt; ++j)
1282 if (local_got_refcounts[j] > 0)
1283 htab->srelgot->size += (local_got_refcounts[j]
1284 * sizeof (Elf32_External_Rela));
1290 /* Set the sizes of the dynamic sections. */
1293 elf_xtensa_size_dynamic_sections (bfd *output_bfd ATTRIBUTE_UNUSED,
1294 struct bfd_link_info *info)
1296 struct elf_xtensa_link_hash_table *htab;
1298 asection *s, *srelplt, *splt, *sgotplt, *srelgot, *spltlittbl, *sgotloc;
1299 bfd_boolean relplt, relgot;
1300 int plt_entries, plt_chunks, chunk;
1305 htab = elf_xtensa_hash_table (info);
1306 dynobj = elf_hash_table (info)->dynobj;
1309 srelgot = htab->srelgot;
1310 srelplt = htab->srelplt;
1312 if (elf_hash_table (info)->dynamic_sections_created)
1314 BFD_ASSERT (htab->srelgot != NULL
1315 && htab->srelplt != NULL
1316 && htab->sgot != NULL
1317 && htab->spltlittbl != NULL
1318 && htab->sgotloc != NULL);
1320 /* Set the contents of the .interp section to the interpreter. */
1321 if (info->executable)
1323 s = bfd_get_section_by_name (dynobj, ".interp");
1326 s->size = sizeof ELF_DYNAMIC_INTERPRETER;
1327 s->contents = (unsigned char *) ELF_DYNAMIC_INTERPRETER;
1330 /* Allocate room for one word in ".got". */
1331 htab->sgot->size = 4;
1333 /* Allocate space in ".rela.got" for literals that reference global
1334 symbols and space in ".rela.plt" for literals that have PLT
1336 elf_link_hash_traverse (elf_hash_table (info),
1337 elf_xtensa_allocate_dynrelocs,
1340 /* If we are generating a shared object, we also need space in
1341 ".rela.got" for R_XTENSA_RELATIVE relocs for literals that
1342 reference local symbols. */
1344 elf_xtensa_allocate_local_got_size (info);
1346 /* Allocate space in ".plt" to match the size of ".rela.plt". For
1347 each PLT entry, we need the PLT code plus a 4-byte literal.
1348 For each chunk of ".plt", we also need two more 4-byte
1349 literals, two corresponding entries in ".rela.got", and an
1350 8-byte entry in ".xt.lit.plt". */
1351 spltlittbl = htab->spltlittbl;
1352 plt_entries = srelplt->size / sizeof (Elf32_External_Rela);
1354 (plt_entries + PLT_ENTRIES_PER_CHUNK - 1) / PLT_ENTRIES_PER_CHUNK;
1356 /* Iterate over all the PLT chunks, including any extra sections
1357 created earlier because the initial count of PLT relocations
1358 was an overestimate. */
1360 (splt = elf_xtensa_get_plt_section (info, chunk)) != NULL;
1365 sgotplt = elf_xtensa_get_gotplt_section (info, chunk);
1366 BFD_ASSERT (sgotplt != NULL);
1368 if (chunk < plt_chunks - 1)
1369 chunk_entries = PLT_ENTRIES_PER_CHUNK;
1370 else if (chunk == plt_chunks - 1)
1371 chunk_entries = plt_entries - (chunk * PLT_ENTRIES_PER_CHUNK);
1375 if (chunk_entries != 0)
1377 sgotplt->size = 4 * (chunk_entries + 2);
1378 splt->size = PLT_ENTRY_SIZE * chunk_entries;
1379 srelgot->size += 2 * sizeof (Elf32_External_Rela);
1380 spltlittbl->size += 8;
1389 /* Allocate space in ".got.loc" to match the total size of all the
1391 sgotloc = htab->sgotloc;
1392 sgotloc->size = spltlittbl->size;
1393 for (abfd = info->input_bfds; abfd != NULL; abfd = abfd->link_next)
1395 if (abfd->flags & DYNAMIC)
1397 for (s = abfd->sections; s != NULL; s = s->next)
1399 if (! elf_discarded_section (s)
1400 && xtensa_is_littable_section (s)
1402 sgotloc->size += s->size;
1407 /* Allocate memory for dynamic sections. */
1410 for (s = dynobj->sections; s != NULL; s = s->next)
1414 if ((s->flags & SEC_LINKER_CREATED) == 0)
1417 /* It's OK to base decisions on the section name, because none
1418 of the dynobj section names depend upon the input files. */
1419 name = bfd_get_section_name (dynobj, s);
1421 if (CONST_STRNEQ (name, ".rela"))
1425 if (strcmp (name, ".rela.plt") == 0)
1427 else if (strcmp (name, ".rela.got") == 0)
1430 /* We use the reloc_count field as a counter if we need
1431 to copy relocs into the output file. */
1435 else if (! CONST_STRNEQ (name, ".plt.")
1436 && ! CONST_STRNEQ (name, ".got.plt.")
1437 && strcmp (name, ".got") != 0
1438 && strcmp (name, ".plt") != 0
1439 && strcmp (name, ".got.plt") != 0
1440 && strcmp (name, ".xt.lit.plt") != 0
1441 && strcmp (name, ".got.loc") != 0)
1443 /* It's not one of our sections, so don't allocate space. */
1449 /* If we don't need this section, strip it from the output
1450 file. We must create the ".plt*" and ".got.plt*"
1451 sections in create_dynamic_sections and/or check_relocs
1452 based on a conservative estimate of the PLT relocation
1453 count, because the sections must be created before the
1454 linker maps input sections to output sections. The
1455 linker does that before size_dynamic_sections, where we
1456 compute the exact size of the PLT, so there may be more
1457 of these sections than are actually needed. */
1458 s->flags |= SEC_EXCLUDE;
1460 else if ((s->flags & SEC_HAS_CONTENTS) != 0)
1462 /* Allocate memory for the section contents. */
1463 s->contents = (bfd_byte *) bfd_zalloc (dynobj, s->size);
1464 if (s->contents == NULL)
1469 if (elf_hash_table (info)->dynamic_sections_created)
1471 /* Add the special XTENSA_RTLD relocations now. The offsets won't be
1472 known until finish_dynamic_sections, but we need to get the relocs
1473 in place before they are sorted. */
1474 for (chunk = 0; chunk < plt_chunks; chunk++)
1476 Elf_Internal_Rela irela;
1480 irela.r_info = ELF32_R_INFO (0, R_XTENSA_RTLD);
1483 loc = (srelgot->contents
1484 + srelgot->reloc_count * sizeof (Elf32_External_Rela));
1485 bfd_elf32_swap_reloca_out (output_bfd, &irela, loc);
1486 bfd_elf32_swap_reloca_out (output_bfd, &irela,
1487 loc + sizeof (Elf32_External_Rela));
1488 srelgot->reloc_count += 2;
1491 /* Add some entries to the .dynamic section. We fill in the
1492 values later, in elf_xtensa_finish_dynamic_sections, but we
1493 must add the entries now so that we get the correct size for
1494 the .dynamic section. The DT_DEBUG entry is filled in by the
1495 dynamic linker and used by the debugger. */
1496 #define add_dynamic_entry(TAG, VAL) \
1497 _bfd_elf_add_dynamic_entry (info, TAG, VAL)
1499 if (info->executable)
1501 if (!add_dynamic_entry (DT_DEBUG, 0))
1507 if (!add_dynamic_entry (DT_PLTGOT, 0)
1508 || !add_dynamic_entry (DT_PLTRELSZ, 0)
1509 || !add_dynamic_entry (DT_PLTREL, DT_RELA)
1510 || !add_dynamic_entry (DT_JMPREL, 0))
1516 if (!add_dynamic_entry (DT_RELA, 0)
1517 || !add_dynamic_entry (DT_RELASZ, 0)
1518 || !add_dynamic_entry (DT_RELAENT, sizeof (Elf32_External_Rela)))
1522 if (!add_dynamic_entry (DT_XTENSA_GOT_LOC_OFF, 0)
1523 || !add_dynamic_entry (DT_XTENSA_GOT_LOC_SZ, 0))
1526 #undef add_dynamic_entry
1532 /* Perform the specified relocation. The instruction at (contents + address)
1533 is modified to set one operand to represent the value in "relocation". The
1534 operand position is determined by the relocation type recorded in the
1537 #define CALL_SEGMENT_BITS (30)
1538 #define CALL_SEGMENT_SIZE (1 << CALL_SEGMENT_BITS)
1540 static bfd_reloc_status_type
1541 elf_xtensa_do_reloc (reloc_howto_type *howto,
1543 asection *input_section,
1547 bfd_boolean is_weak_undef,
1548 char **error_message)
1551 xtensa_opcode opcode;
1552 xtensa_isa isa = xtensa_default_isa;
1553 static xtensa_insnbuf ibuff = NULL;
1554 static xtensa_insnbuf sbuff = NULL;
1555 bfd_vma self_address = 0;
1556 bfd_size_type input_size;
1562 ibuff = xtensa_insnbuf_alloc (isa);
1563 sbuff = xtensa_insnbuf_alloc (isa);
1566 input_size = bfd_get_section_limit (abfd, input_section);
1568 switch (howto->type)
1571 case R_XTENSA_DIFF8:
1572 case R_XTENSA_DIFF16:
1573 case R_XTENSA_DIFF32:
1574 return bfd_reloc_ok;
1576 case R_XTENSA_ASM_EXPAND:
1579 /* Check for windowed CALL across a 1GB boundary. */
1580 xtensa_opcode opcode =
1581 get_expanded_call_opcode (contents + address,
1582 input_size - address, 0);
1583 if (is_windowed_call_opcode (opcode))
1585 self_address = (input_section->output_section->vma
1586 + input_section->output_offset
1588 if ((self_address >> CALL_SEGMENT_BITS)
1589 != (relocation >> CALL_SEGMENT_BITS))
1591 *error_message = "windowed longcall crosses 1GB boundary; "
1593 return bfd_reloc_dangerous;
1597 return bfd_reloc_ok;
1599 case R_XTENSA_ASM_SIMPLIFY:
1601 /* Convert the L32R/CALLX to CALL. */
1602 bfd_reloc_status_type retval =
1603 elf_xtensa_do_asm_simplify (contents, address, input_size,
1605 if (retval != bfd_reloc_ok)
1606 return bfd_reloc_dangerous;
1608 /* The CALL needs to be relocated. Continue below for that part. */
1610 howto = &elf_howto_table[(unsigned) R_XTENSA_SLOT0_OP ];
1618 x = bfd_get_32 (abfd, contents + address);
1620 bfd_put_32 (abfd, x, contents + address);
1622 return bfd_reloc_ok;
1625 /* Only instruction slot-specific relocations handled below.... */
1626 slot = get_relocation_slot (howto->type);
1627 if (slot == XTENSA_UNDEFINED)
1629 *error_message = "unexpected relocation";
1630 return bfd_reloc_dangerous;
1633 /* Read the instruction into a buffer and decode the opcode. */
1634 xtensa_insnbuf_from_chars (isa, ibuff, contents + address,
1635 input_size - address);
1636 fmt = xtensa_format_decode (isa, ibuff);
1637 if (fmt == XTENSA_UNDEFINED)
1639 *error_message = "cannot decode instruction format";
1640 return bfd_reloc_dangerous;
1643 xtensa_format_get_slot (isa, fmt, slot, ibuff, sbuff);
1645 opcode = xtensa_opcode_decode (isa, fmt, slot, sbuff);
1646 if (opcode == XTENSA_UNDEFINED)
1648 *error_message = "cannot decode instruction opcode";
1649 return bfd_reloc_dangerous;
1652 /* Check for opcode-specific "alternate" relocations. */
1653 if (is_alt_relocation (howto->type))
1655 if (opcode == get_l32r_opcode ())
1657 /* Handle the special-case of non-PC-relative L32R instructions. */
1658 bfd *output_bfd = input_section->output_section->owner;
1659 asection *lit4_sec = bfd_get_section_by_name (output_bfd, ".lit4");
1662 *error_message = "relocation references missing .lit4 section";
1663 return bfd_reloc_dangerous;
1665 self_address = ((lit4_sec->vma & ~0xfff)
1666 + 0x40000 - 3); /* -3 to compensate for do_reloc */
1667 newval = relocation;
1670 else if (opcode == get_const16_opcode ())
1672 /* ALT used for high 16 bits. */
1673 newval = relocation >> 16;
1678 /* No other "alternate" relocations currently defined. */
1679 *error_message = "unexpected relocation";
1680 return bfd_reloc_dangerous;
1683 else /* Not an "alternate" relocation.... */
1685 if (opcode == get_const16_opcode ())
1687 newval = relocation & 0xffff;
1692 /* ...normal PC-relative relocation.... */
1694 /* Determine which operand is being relocated. */
1695 opnd = get_relocation_opnd (opcode, howto->type);
1696 if (opnd == XTENSA_UNDEFINED)
1698 *error_message = "unexpected relocation";
1699 return bfd_reloc_dangerous;
1702 if (!howto->pc_relative)
1704 *error_message = "expected PC-relative relocation";
1705 return bfd_reloc_dangerous;
1708 /* Calculate the PC address for this instruction. */
1709 self_address = (input_section->output_section->vma
1710 + input_section->output_offset
1713 newval = relocation;
1717 /* Apply the relocation. */
1718 if (xtensa_operand_do_reloc (isa, opcode, opnd, &newval, self_address)
1719 || xtensa_operand_encode (isa, opcode, opnd, &newval)
1720 || xtensa_operand_set_field (isa, opcode, opnd, fmt, slot,
1723 const char *opname = xtensa_opcode_name (isa, opcode);
1726 msg = "cannot encode";
1727 if (is_direct_call_opcode (opcode))
1729 if ((relocation & 0x3) != 0)
1730 msg = "misaligned call target";
1732 msg = "call target out of range";
1734 else if (opcode == get_l32r_opcode ())
1736 if ((relocation & 0x3) != 0)
1737 msg = "misaligned literal target";
1738 else if (is_alt_relocation (howto->type))
1739 msg = "literal target out of range (too many literals)";
1740 else if (self_address > relocation)
1741 msg = "literal target out of range (try using text-section-literals)";
1743 msg = "literal placed after use";
1746 *error_message = vsprint_msg (opname, ": %s", strlen (msg) + 2, msg);
1747 return bfd_reloc_dangerous;
1750 /* Check for calls across 1GB boundaries. */
1751 if (is_direct_call_opcode (opcode)
1752 && is_windowed_call_opcode (opcode))
1754 if ((self_address >> CALL_SEGMENT_BITS)
1755 != (relocation >> CALL_SEGMENT_BITS))
1758 "windowed call crosses 1GB boundary; return may fail";
1759 return bfd_reloc_dangerous;
1763 /* Write the modified instruction back out of the buffer. */
1764 xtensa_format_set_slot (isa, fmt, slot, ibuff, sbuff);
1765 xtensa_insnbuf_to_chars (isa, ibuff, contents + address,
1766 input_size - address);
1767 return bfd_reloc_ok;
1772 vsprint_msg (const char *origmsg, const char *fmt, int arglen, ...)
1774 /* To reduce the size of the memory leak,
1775 we only use a single message buffer. */
1776 static bfd_size_type alloc_size = 0;
1777 static char *message = NULL;
1778 bfd_size_type orig_len, len = 0;
1779 bfd_boolean is_append;
1781 VA_OPEN (ap, arglen);
1782 VA_FIXEDARG (ap, const char *, origmsg);
1784 is_append = (origmsg == message);
1786 orig_len = strlen (origmsg);
1787 len = orig_len + strlen (fmt) + arglen + 20;
1788 if (len > alloc_size)
1790 message = (char *) bfd_realloc (message, len);
1794 memcpy (message, origmsg, orig_len);
1795 vsprintf (message + orig_len, fmt, ap);
1801 /* This function is registered as the "special_function" in the
1802 Xtensa howto for handling simplify operations.
1803 bfd_perform_relocation / bfd_install_relocation use it to
1804 perform (install) the specified relocation. Since this replaces the code
1805 in bfd_perform_relocation, it is basically an Xtensa-specific,
1806 stripped-down version of bfd_perform_relocation. */
1808 static bfd_reloc_status_type
1809 bfd_elf_xtensa_reloc (bfd *abfd,
1810 arelent *reloc_entry,
1813 asection *input_section,
1815 char **error_message)
1818 bfd_reloc_status_type flag;
1819 bfd_size_type octets = reloc_entry->address * bfd_octets_per_byte (abfd);
1820 bfd_vma output_base = 0;
1821 reloc_howto_type *howto = reloc_entry->howto;
1822 asection *reloc_target_output_section;
1823 bfd_boolean is_weak_undef;
1825 if (!xtensa_default_isa)
1826 xtensa_default_isa = xtensa_isa_init (0, 0);
1828 /* ELF relocs are against symbols. If we are producing relocatable
1829 output, and the reloc is against an external symbol, the resulting
1830 reloc will also be against the same symbol. In such a case, we
1831 don't want to change anything about the way the reloc is handled,
1832 since it will all be done at final link time. This test is similar
1833 to what bfd_elf_generic_reloc does except that it lets relocs with
1834 howto->partial_inplace go through even if the addend is non-zero.
1835 (The real problem is that partial_inplace is set for XTENSA_32
1836 relocs to begin with, but that's a long story and there's little we
1837 can do about it now....) */
1839 if (output_bfd && (symbol->flags & BSF_SECTION_SYM) == 0)
1841 reloc_entry->address += input_section->output_offset;
1842 return bfd_reloc_ok;
1845 /* Is the address of the relocation really within the section? */
1846 if (reloc_entry->address > bfd_get_section_limit (abfd, input_section))
1847 return bfd_reloc_outofrange;
1849 /* Work out which section the relocation is targeted at and the
1850 initial relocation command value. */
1852 /* Get symbol value. (Common symbols are special.) */
1853 if (bfd_is_com_section (symbol->section))
1856 relocation = symbol->value;
1858 reloc_target_output_section = symbol->section->output_section;
1860 /* Convert input-section-relative symbol value to absolute. */
1861 if ((output_bfd && !howto->partial_inplace)
1862 || reloc_target_output_section == NULL)
1865 output_base = reloc_target_output_section->vma;
1867 relocation += output_base + symbol->section->output_offset;
1869 /* Add in supplied addend. */
1870 relocation += reloc_entry->addend;
1872 /* Here the variable relocation holds the final address of the
1873 symbol we are relocating against, plus any addend. */
1876 if (!howto->partial_inplace)
1878 /* This is a partial relocation, and we want to apply the relocation
1879 to the reloc entry rather than the raw data. Everything except
1880 relocations against section symbols has already been handled
1883 BFD_ASSERT (symbol->flags & BSF_SECTION_SYM);
1884 reloc_entry->addend = relocation;
1885 reloc_entry->address += input_section->output_offset;
1886 return bfd_reloc_ok;
1890 reloc_entry->address += input_section->output_offset;
1891 reloc_entry->addend = 0;
1895 is_weak_undef = (bfd_is_und_section (symbol->section)
1896 && (symbol->flags & BSF_WEAK) != 0);
1897 flag = elf_xtensa_do_reloc (howto, abfd, input_section, relocation,
1898 (bfd_byte *) data, (bfd_vma) octets,
1899 is_weak_undef, error_message);
1901 if (flag == bfd_reloc_dangerous)
1903 /* Add the symbol name to the error message. */
1904 if (! *error_message)
1905 *error_message = "";
1906 *error_message = vsprint_msg (*error_message, ": (%s + 0x%lx)",
1907 strlen (symbol->name) + 17,
1909 (unsigned long) reloc_entry->addend);
1916 /* Set up an entry in the procedure linkage table. */
1919 elf_xtensa_create_plt_entry (struct bfd_link_info *info,
1921 unsigned reloc_index)
1923 asection *splt, *sgotplt;
1924 bfd_vma plt_base, got_base;
1925 bfd_vma code_offset, lit_offset;
1928 chunk = reloc_index / PLT_ENTRIES_PER_CHUNK;
1929 splt = elf_xtensa_get_plt_section (info, chunk);
1930 sgotplt = elf_xtensa_get_gotplt_section (info, chunk);
1931 BFD_ASSERT (splt != NULL && sgotplt != NULL);
1933 plt_base = splt->output_section->vma + splt->output_offset;
1934 got_base = sgotplt->output_section->vma + sgotplt->output_offset;
1936 lit_offset = 8 + (reloc_index % PLT_ENTRIES_PER_CHUNK) * 4;
1937 code_offset = (reloc_index % PLT_ENTRIES_PER_CHUNK) * PLT_ENTRY_SIZE;
1939 /* Fill in the literal entry. This is the offset of the dynamic
1940 relocation entry. */
1941 bfd_put_32 (output_bfd, reloc_index * sizeof (Elf32_External_Rela),
1942 sgotplt->contents + lit_offset);
1944 /* Fill in the entry in the procedure linkage table. */
1945 memcpy (splt->contents + code_offset,
1946 (bfd_big_endian (output_bfd)
1947 ? elf_xtensa_be_plt_entry
1948 : elf_xtensa_le_plt_entry),
1950 bfd_put_16 (output_bfd, l32r_offset (got_base + 0,
1951 plt_base + code_offset + 3),
1952 splt->contents + code_offset + 4);
1953 bfd_put_16 (output_bfd, l32r_offset (got_base + 4,
1954 plt_base + code_offset + 6),
1955 splt->contents + code_offset + 7);
1956 bfd_put_16 (output_bfd, l32r_offset (got_base + lit_offset,
1957 plt_base + code_offset + 9),
1958 splt->contents + code_offset + 10);
1960 return plt_base + code_offset;
1964 /* Relocate an Xtensa ELF section. This is invoked by the linker for
1965 both relocatable and final links. */
1968 elf_xtensa_relocate_section (bfd *output_bfd,
1969 struct bfd_link_info *info,
1971 asection *input_section,
1973 Elf_Internal_Rela *relocs,
1974 Elf_Internal_Sym *local_syms,
1975 asection **local_sections)
1977 struct elf_xtensa_link_hash_table *htab;
1978 Elf_Internal_Shdr *symtab_hdr;
1979 Elf_Internal_Rela *rel;
1980 Elf_Internal_Rela *relend;
1981 struct elf_link_hash_entry **sym_hashes;
1982 property_table_entry *lit_table = 0;
1984 char *error_message = NULL;
1985 bfd_size_type input_size;
1987 if (!xtensa_default_isa)
1988 xtensa_default_isa = xtensa_isa_init (0, 0);
1990 htab = elf_xtensa_hash_table (info);
1991 symtab_hdr = &elf_tdata (input_bfd)->symtab_hdr;
1992 sym_hashes = elf_sym_hashes (input_bfd);
1994 if (elf_hash_table (info)->dynamic_sections_created)
1996 ltblsize = xtensa_read_table_entries (input_bfd, input_section,
1997 &lit_table, XTENSA_LIT_SEC_NAME,
2003 input_size = bfd_get_section_limit (input_bfd, input_section);
2006 relend = relocs + input_section->reloc_count;
2007 for (; rel < relend; rel++)
2010 reloc_howto_type *howto;
2011 unsigned long r_symndx;
2012 struct elf_link_hash_entry *h;
2013 Elf_Internal_Sym *sym;
2016 bfd_reloc_status_type r;
2017 bfd_boolean is_weak_undef;
2018 bfd_boolean unresolved_reloc;
2021 r_type = ELF32_R_TYPE (rel->r_info);
2022 if (r_type == (int) R_XTENSA_GNU_VTINHERIT
2023 || r_type == (int) R_XTENSA_GNU_VTENTRY)
2026 if (r_type < 0 || r_type >= (int) R_XTENSA_max)
2028 bfd_set_error (bfd_error_bad_value);
2031 howto = &elf_howto_table[r_type];
2033 r_symndx = ELF32_R_SYM (rel->r_info);
2038 is_weak_undef = FALSE;
2039 unresolved_reloc = FALSE;
2042 if (howto->partial_inplace && !info->relocatable)
2044 /* Because R_XTENSA_32 was made partial_inplace to fix some
2045 problems with DWARF info in partial links, there may be
2046 an addend stored in the contents. Take it out of there
2047 and move it back into the addend field of the reloc. */
2048 rel->r_addend += bfd_get_32 (input_bfd, contents + rel->r_offset);
2049 bfd_put_32 (input_bfd, 0, contents + rel->r_offset);
2052 if (r_symndx < symtab_hdr->sh_info)
2054 sym = local_syms + r_symndx;
2055 sec = local_sections[r_symndx];
2056 relocation = _bfd_elf_rela_local_sym (output_bfd, sym, &sec, rel);
2060 RELOC_FOR_GLOBAL_SYMBOL (info, input_bfd, input_section, rel,
2061 r_symndx, symtab_hdr, sym_hashes,
2063 unresolved_reloc, warned);
2066 && !unresolved_reloc
2067 && h->root.type == bfd_link_hash_undefweak)
2068 is_weak_undef = TRUE;
2071 if (sec != NULL && elf_discarded_section (sec))
2073 /* For relocs against symbols from removed linkonce sections,
2074 or sections discarded by a linker script, we just want the
2075 section contents zeroed. Avoid any special processing. */
2076 _bfd_clear_contents (howto, input_bfd, contents + rel->r_offset);
2082 if (info->relocatable)
2084 /* This is a relocatable link.
2085 1) If the reloc is against a section symbol, adjust
2086 according to the output section.
2087 2) If there is a new target for this relocation,
2088 the new target will be in the same output section.
2089 We adjust the relocation by the output section
2092 if (relaxing_section)
2094 /* Check if this references a section in another input file. */
2095 if (!do_fix_for_relocatable_link (rel, input_bfd, input_section,
2098 r_type = ELF32_R_TYPE (rel->r_info);
2101 if (r_type == R_XTENSA_ASM_SIMPLIFY)
2103 char *error_message = NULL;
2104 /* Convert ASM_SIMPLIFY into the simpler relocation
2105 so that they never escape a relaxing link. */
2106 r = contract_asm_expansion (contents, input_size, rel,
2108 if (r != bfd_reloc_ok)
2110 if (!((*info->callbacks->reloc_dangerous)
2111 (info, error_message, input_bfd, input_section,
2115 r_type = ELF32_R_TYPE (rel->r_info);
2118 /* This is a relocatable link, so we don't have to change
2119 anything unless the reloc is against a section symbol,
2120 in which case we have to adjust according to where the
2121 section symbol winds up in the output section. */
2122 if (r_symndx < symtab_hdr->sh_info)
2124 sym = local_syms + r_symndx;
2125 if (ELF_ST_TYPE (sym->st_info) == STT_SECTION)
2127 sec = local_sections[r_symndx];
2128 rel->r_addend += sec->output_offset + sym->st_value;
2132 /* If there is an addend with a partial_inplace howto,
2133 then move the addend to the contents. This is a hack
2134 to work around problems with DWARF in relocatable links
2135 with some previous version of BFD. Now we can't easily get
2136 rid of the hack without breaking backward compatibility.... */
2139 howto = &elf_howto_table[r_type];
2140 if (howto->partial_inplace)
2142 r = elf_xtensa_do_reloc (howto, input_bfd, input_section,
2143 rel->r_addend, contents,
2144 rel->r_offset, FALSE,
2146 if (r != bfd_reloc_ok)
2148 if (!((*info->callbacks->reloc_dangerous)
2149 (info, error_message, input_bfd, input_section,
2157 /* Done with work for relocatable link; continue with next reloc. */
2161 /* This is a final link. */
2163 if (relaxing_section)
2165 /* Check if this references a section in another input file. */
2166 do_fix_for_final_link (rel, input_bfd, input_section, contents,
2169 /* Update some already cached values. */
2170 r_type = ELF32_R_TYPE (rel->r_info);
2171 howto = &elf_howto_table[r_type];
2174 /* Sanity check the address. */
2175 if (rel->r_offset >= input_size
2176 && ELF32_R_TYPE (rel->r_info) != R_XTENSA_NONE)
2178 (*_bfd_error_handler)
2179 (_("%B(%A+0x%lx): relocation offset out of range (size=0x%x)"),
2180 input_bfd, input_section, rel->r_offset, input_size);
2181 bfd_set_error (bfd_error_bad_value);
2185 /* Generate dynamic relocations. */
2186 if (elf_hash_table (info)->dynamic_sections_created)
2188 bfd_boolean dynamic_symbol = elf_xtensa_dynamic_symbol_p (h, info);
2190 if (dynamic_symbol && is_operand_relocation (r_type))
2192 /* This is an error. The symbol's real value won't be known
2193 until runtime and it's likely to be out of range anyway. */
2194 const char *name = h->root.root.string;
2195 error_message = vsprint_msg ("invalid relocation for dynamic "
2197 strlen (name) + 2, name);
2198 if (!((*info->callbacks->reloc_dangerous)
2199 (info, error_message, input_bfd, input_section,
2203 else if ((r_type == R_XTENSA_32 || r_type == R_XTENSA_PLT)
2204 && (input_section->flags & SEC_ALLOC) != 0
2205 && (dynamic_symbol || info->shared))
2207 Elf_Internal_Rela outrel;
2211 if (dynamic_symbol && r_type == R_XTENSA_PLT)
2212 srel = htab->srelplt;
2214 srel = htab->srelgot;
2216 BFD_ASSERT (srel != NULL);
2219 _bfd_elf_section_offset (output_bfd, info,
2220 input_section, rel->r_offset);
2222 if ((outrel.r_offset | 1) == (bfd_vma) -1)
2223 memset (&outrel, 0, sizeof outrel);
2226 outrel.r_offset += (input_section->output_section->vma
2227 + input_section->output_offset);
2229 /* Complain if the relocation is in a read-only section
2230 and not in a literal pool. */
2231 if ((input_section->flags & SEC_READONLY) != 0
2232 && !elf_xtensa_in_literal_pool (lit_table, ltblsize,
2236 _("dynamic relocation in read-only section");
2237 if (!((*info->callbacks->reloc_dangerous)
2238 (info, error_message, input_bfd, input_section,
2245 outrel.r_addend = rel->r_addend;
2248 if (r_type == R_XTENSA_32)
2251 ELF32_R_INFO (h->dynindx, R_XTENSA_GLOB_DAT);
2254 else /* r_type == R_XTENSA_PLT */
2257 ELF32_R_INFO (h->dynindx, R_XTENSA_JMP_SLOT);
2259 /* Create the PLT entry and set the initial
2260 contents of the literal entry to the address of
2263 elf_xtensa_create_plt_entry (info, output_bfd,
2266 unresolved_reloc = FALSE;
2270 /* Generate a RELATIVE relocation. */
2271 outrel.r_info = ELF32_R_INFO (0, R_XTENSA_RELATIVE);
2272 outrel.r_addend = 0;
2276 loc = (srel->contents
2277 + srel->reloc_count++ * sizeof (Elf32_External_Rela));
2278 bfd_elf32_swap_reloca_out (output_bfd, &outrel, loc);
2279 BFD_ASSERT (sizeof (Elf32_External_Rela) * srel->reloc_count
2284 /* Dynamic relocs are not propagated for SEC_DEBUGGING sections
2285 because such sections are not SEC_ALLOC and thus ld.so will
2286 not process them. */
2287 if (unresolved_reloc
2288 && !((input_section->flags & SEC_DEBUGGING) != 0
2291 (*_bfd_error_handler)
2292 (_("%B(%A+0x%lx): unresolvable %s relocation against symbol `%s'"),
2295 (long) rel->r_offset,
2297 h->root.root.string);
2301 /* There's no point in calling bfd_perform_relocation here.
2302 Just go directly to our "special function". */
2303 r = elf_xtensa_do_reloc (howto, input_bfd, input_section,
2304 relocation + rel->r_addend,
2305 contents, rel->r_offset, is_weak_undef,
2308 if (r != bfd_reloc_ok && !warned)
2312 BFD_ASSERT (r == bfd_reloc_dangerous || r == bfd_reloc_other);
2313 BFD_ASSERT (error_message != NULL);
2316 name = h->root.root.string;
2319 name = bfd_elf_string_from_elf_section
2320 (input_bfd, symtab_hdr->sh_link, sym->st_name);
2321 if (name && *name == '\0')
2322 name = bfd_section_name (input_bfd, sec);
2326 if (rel->r_addend == 0)
2327 error_message = vsprint_msg (error_message, ": %s",
2328 strlen (name) + 2, name);
2330 error_message = vsprint_msg (error_message, ": (%s+0x%x)",
2332 name, (int)rel->r_addend);
2335 if (!((*info->callbacks->reloc_dangerous)
2336 (info, error_message, input_bfd, input_section,
2345 input_section->reloc_done = TRUE;
2351 /* Finish up dynamic symbol handling. There's not much to do here since
2352 the PLT and GOT entries are all set up by relocate_section. */
2355 elf_xtensa_finish_dynamic_symbol (bfd *output_bfd ATTRIBUTE_UNUSED,
2356 struct bfd_link_info *info ATTRIBUTE_UNUSED,
2357 struct elf_link_hash_entry *h,
2358 Elf_Internal_Sym *sym)
2360 if (h->needs_plt && !h->def_regular)
2362 /* Mark the symbol as undefined, rather than as defined in
2363 the .plt section. Leave the value alone. */
2364 sym->st_shndx = SHN_UNDEF;
2365 /* If the symbol is weak, we do need to clear the value.
2366 Otherwise, the PLT entry would provide a definition for
2367 the symbol even if the symbol wasn't defined anywhere,
2368 and so the symbol would never be NULL. */
2369 if (!h->ref_regular_nonweak)
2373 /* Mark _DYNAMIC and _GLOBAL_OFFSET_TABLE_ as absolute. */
2374 if (strcmp (h->root.root.string, "_DYNAMIC") == 0
2375 || h == elf_hash_table (info)->hgot)
2376 sym->st_shndx = SHN_ABS;
2382 /* Combine adjacent literal table entries in the output. Adjacent
2383 entries within each input section may have been removed during
2384 relaxation, but we repeat the process here, even though it's too late
2385 to shrink the output section, because it's important to minimize the
2386 number of literal table entries to reduce the start-up work for the
2387 runtime linker. Returns the number of remaining table entries or -1
2391 elf_xtensa_combine_prop_entries (bfd *output_bfd,
2396 property_table_entry *table;
2397 bfd_size_type section_size, sgotloc_size;
2401 section_size = sxtlit->size;
2402 BFD_ASSERT (section_size % 8 == 0);
2403 num = section_size / 8;
2405 sgotloc_size = sgotloc->size;
2406 if (sgotloc_size != section_size)
2408 (*_bfd_error_handler)
2409 (_("internal inconsistency in size of .got.loc section"));
2413 table = bfd_malloc (num * sizeof (property_table_entry));
2417 /* The ".xt.lit.plt" section has the SEC_IN_MEMORY flag set and this
2418 propagates to the output section, where it doesn't really apply and
2419 where it breaks the following call to bfd_malloc_and_get_section. */
2420 sxtlit->flags &= ~SEC_IN_MEMORY;
2422 if (!bfd_malloc_and_get_section (output_bfd, sxtlit, &contents))
2430 /* There should never be any relocations left at this point, so this
2431 is quite a bit easier than what is done during relaxation. */
2433 /* Copy the raw contents into a property table array and sort it. */
2435 for (n = 0; n < num; n++)
2437 table[n].address = bfd_get_32 (output_bfd, &contents[offset]);
2438 table[n].size = bfd_get_32 (output_bfd, &contents[offset + 4]);
2441 qsort (table, num, sizeof (property_table_entry), property_table_compare);
2443 for (n = 0; n < num; n++)
2445 bfd_boolean remove = FALSE;
2447 if (table[n].size == 0)
2450 (table[n-1].address + table[n-1].size == table[n].address))
2452 table[n-1].size += table[n].size;
2458 for (m = n; m < num - 1; m++)
2460 table[m].address = table[m+1].address;
2461 table[m].size = table[m+1].size;
2469 /* Copy the data back to the raw contents. */
2471 for (n = 0; n < num; n++)
2473 bfd_put_32 (output_bfd, table[n].address, &contents[offset]);
2474 bfd_put_32 (output_bfd, table[n].size, &contents[offset + 4]);
2478 /* Clear the removed bytes. */
2479 if ((bfd_size_type) (num * 8) < section_size)
2480 memset (&contents[num * 8], 0, section_size - num * 8);
2482 if (! bfd_set_section_contents (output_bfd, sxtlit, contents, 0,
2486 /* Copy the contents to ".got.loc". */
2487 memcpy (sgotloc->contents, contents, section_size);
2495 /* Finish up the dynamic sections. */
2498 elf_xtensa_finish_dynamic_sections (bfd *output_bfd,
2499 struct bfd_link_info *info)
2501 struct elf_xtensa_link_hash_table *htab;
2503 asection *sdyn, *srelplt, *sgot, *sxtlit, *sgotloc;
2504 Elf32_External_Dyn *dyncon, *dynconend;
2505 int num_xtlit_entries;
2507 if (! elf_hash_table (info)->dynamic_sections_created)
2510 htab = elf_xtensa_hash_table (info);
2511 dynobj = elf_hash_table (info)->dynobj;
2512 sdyn = bfd_get_section_by_name (dynobj, ".dynamic");
2513 BFD_ASSERT (sdyn != NULL);
2515 /* Set the first entry in the global offset table to the address of
2516 the dynamic section. */
2520 BFD_ASSERT (sgot->size == 4);
2522 bfd_put_32 (output_bfd, 0, sgot->contents);
2524 bfd_put_32 (output_bfd,
2525 sdyn->output_section->vma + sdyn->output_offset,
2529 srelplt = htab->srelplt;
2530 if (srelplt && srelplt->size != 0)
2532 asection *sgotplt, *srelgot, *spltlittbl;
2533 int chunk, plt_chunks, plt_entries;
2534 Elf_Internal_Rela irela;
2536 unsigned rtld_reloc;
2538 srelgot = htab->srelgot;
2539 spltlittbl = htab->spltlittbl;
2540 BFD_ASSERT (srelgot != NULL && spltlittbl != NULL);
2542 /* Find the first XTENSA_RTLD relocation. Presumably the rest
2543 of them follow immediately after.... */
2544 for (rtld_reloc = 0; rtld_reloc < srelgot->reloc_count; rtld_reloc++)
2546 loc = srelgot->contents + rtld_reloc * sizeof (Elf32_External_Rela);
2547 bfd_elf32_swap_reloca_in (output_bfd, loc, &irela);
2548 if (ELF32_R_TYPE (irela.r_info) == R_XTENSA_RTLD)
2551 BFD_ASSERT (rtld_reloc < srelgot->reloc_count);
2553 plt_entries = srelplt->size / sizeof (Elf32_External_Rela);
2555 (plt_entries + PLT_ENTRIES_PER_CHUNK - 1) / PLT_ENTRIES_PER_CHUNK;
2557 for (chunk = 0; chunk < plt_chunks; chunk++)
2559 int chunk_entries = 0;
2561 sgotplt = elf_xtensa_get_gotplt_section (info, chunk);
2562 BFD_ASSERT (sgotplt != NULL);
2564 /* Emit special RTLD relocations for the first two entries in
2565 each chunk of the .got.plt section. */
2567 loc = srelgot->contents + rtld_reloc * sizeof (Elf32_External_Rela);
2568 bfd_elf32_swap_reloca_in (output_bfd, loc, &irela);
2569 BFD_ASSERT (ELF32_R_TYPE (irela.r_info) == R_XTENSA_RTLD);
2570 irela.r_offset = (sgotplt->output_section->vma
2571 + sgotplt->output_offset);
2572 irela.r_addend = 1; /* tell rtld to set value to resolver function */
2573 bfd_elf32_swap_reloca_out (output_bfd, &irela, loc);
2575 BFD_ASSERT (rtld_reloc <= srelgot->reloc_count);
2577 /* Next literal immediately follows the first. */
2578 loc += sizeof (Elf32_External_Rela);
2579 bfd_elf32_swap_reloca_in (output_bfd, loc, &irela);
2580 BFD_ASSERT (ELF32_R_TYPE (irela.r_info) == R_XTENSA_RTLD);
2581 irela.r_offset = (sgotplt->output_section->vma
2582 + sgotplt->output_offset + 4);
2583 /* Tell rtld to set value to object's link map. */
2585 bfd_elf32_swap_reloca_out (output_bfd, &irela, loc);
2587 BFD_ASSERT (rtld_reloc <= srelgot->reloc_count);
2589 /* Fill in the literal table. */
2590 if (chunk < plt_chunks - 1)
2591 chunk_entries = PLT_ENTRIES_PER_CHUNK;
2593 chunk_entries = plt_entries - (chunk * PLT_ENTRIES_PER_CHUNK);
2595 BFD_ASSERT ((unsigned) (chunk + 1) * 8 <= spltlittbl->size);
2596 bfd_put_32 (output_bfd,
2597 sgotplt->output_section->vma + sgotplt->output_offset,
2598 spltlittbl->contents + (chunk * 8) + 0);
2599 bfd_put_32 (output_bfd,
2600 8 + (chunk_entries * 4),
2601 spltlittbl->contents + (chunk * 8) + 4);
2604 /* All the dynamic relocations have been emitted at this point.
2605 Make sure the relocation sections are the correct size. */
2606 if (srelgot->size != (sizeof (Elf32_External_Rela)
2607 * srelgot->reloc_count)
2608 || srelplt->size != (sizeof (Elf32_External_Rela)
2609 * srelplt->reloc_count))
2612 /* The .xt.lit.plt section has just been modified. This must
2613 happen before the code below which combines adjacent literal
2614 table entries, and the .xt.lit.plt contents have to be forced to
2616 if (! bfd_set_section_contents (output_bfd,
2617 spltlittbl->output_section,
2618 spltlittbl->contents,
2619 spltlittbl->output_offset,
2622 /* Clear SEC_HAS_CONTENTS so the contents won't be output again. */
2623 spltlittbl->flags &= ~SEC_HAS_CONTENTS;
2626 /* Combine adjacent literal table entries. */
2627 BFD_ASSERT (! info->relocatable);
2628 sxtlit = bfd_get_section_by_name (output_bfd, ".xt.lit");
2629 sgotloc = htab->sgotloc;
2630 BFD_ASSERT (sxtlit && sgotloc);
2632 elf_xtensa_combine_prop_entries (output_bfd, sxtlit, sgotloc);
2633 if (num_xtlit_entries < 0)
2636 dyncon = (Elf32_External_Dyn *) sdyn->contents;
2637 dynconend = (Elf32_External_Dyn *) (sdyn->contents + sdyn->size);
2638 for (; dyncon < dynconend; dyncon++)
2640 Elf_Internal_Dyn dyn;
2642 bfd_elf32_swap_dyn_in (dynobj, dyncon, &dyn);
2649 case DT_XTENSA_GOT_LOC_SZ:
2650 dyn.d_un.d_val = num_xtlit_entries;
2653 case DT_XTENSA_GOT_LOC_OFF:
2654 dyn.d_un.d_ptr = htab->sgotloc->output_section->vma;
2658 dyn.d_un.d_ptr = htab->sgot->output_section->vma;
2662 dyn.d_un.d_ptr = htab->srelplt->output_section->vma;
2666 dyn.d_un.d_val = htab->srelplt->output_section->size;
2670 /* Adjust RELASZ to not include JMPREL. This matches what
2671 glibc expects and what is done for several other ELF
2672 targets (e.g., i386, alpha), but the "correct" behavior
2673 seems to be unresolved. Since the linker script arranges
2674 for .rela.plt to follow all other relocation sections, we
2675 don't have to worry about changing the DT_RELA entry. */
2677 dyn.d_un.d_val -= htab->srelplt->output_section->size;
2681 bfd_elf32_swap_dyn_out (output_bfd, &dyn, dyncon);
2688 /* Functions for dealing with the e_flags field. */
2690 /* Merge backend specific data from an object file to the output
2691 object file when linking. */
2694 elf_xtensa_merge_private_bfd_data (bfd *ibfd, bfd *obfd)
2696 unsigned out_mach, in_mach;
2697 flagword out_flag, in_flag;
2699 /* Check if we have the same endianess. */
2700 if (!_bfd_generic_verify_endian_match (ibfd, obfd))
2703 /* Don't even pretend to support mixed-format linking. */
2704 if (bfd_get_flavour (ibfd) != bfd_target_elf_flavour
2705 || bfd_get_flavour (obfd) != bfd_target_elf_flavour)
2708 out_flag = elf_elfheader (obfd)->e_flags;
2709 in_flag = elf_elfheader (ibfd)->e_flags;
2711 out_mach = out_flag & EF_XTENSA_MACH;
2712 in_mach = in_flag & EF_XTENSA_MACH;
2713 if (out_mach != in_mach)
2715 (*_bfd_error_handler)
2716 (_("%B: incompatible machine type. Output is 0x%x. Input is 0x%x"),
2717 ibfd, out_mach, in_mach);
2718 bfd_set_error (bfd_error_wrong_format);
2722 if (! elf_flags_init (obfd))
2724 elf_flags_init (obfd) = TRUE;
2725 elf_elfheader (obfd)->e_flags = in_flag;
2727 if (bfd_get_arch (obfd) == bfd_get_arch (ibfd)
2728 && bfd_get_arch_info (obfd)->the_default)
2729 return bfd_set_arch_mach (obfd, bfd_get_arch (ibfd),
2730 bfd_get_mach (ibfd));
2735 if ((out_flag & EF_XTENSA_XT_INSN) != (in_flag & EF_XTENSA_XT_INSN))
2736 elf_elfheader (obfd)->e_flags &= (~ EF_XTENSA_XT_INSN);
2738 if ((out_flag & EF_XTENSA_XT_LIT) != (in_flag & EF_XTENSA_XT_LIT))
2739 elf_elfheader (obfd)->e_flags &= (~ EF_XTENSA_XT_LIT);
2746 elf_xtensa_set_private_flags (bfd *abfd, flagword flags)
2748 BFD_ASSERT (!elf_flags_init (abfd)
2749 || elf_elfheader (abfd)->e_flags == flags);
2751 elf_elfheader (abfd)->e_flags |= flags;
2752 elf_flags_init (abfd) = TRUE;
2759 elf_xtensa_print_private_bfd_data (bfd *abfd, void *farg)
2761 FILE *f = (FILE *) farg;
2762 flagword e_flags = elf_elfheader (abfd)->e_flags;
2764 fprintf (f, "\nXtensa header:\n");
2765 if ((e_flags & EF_XTENSA_MACH) == E_XTENSA_MACH)
2766 fprintf (f, "\nMachine = Base\n");
2768 fprintf (f, "\nMachine Id = 0x%x\n", e_flags & EF_XTENSA_MACH);
2770 fprintf (f, "Insn tables = %s\n",
2771 (e_flags & EF_XTENSA_XT_INSN) ? "true" : "false");
2773 fprintf (f, "Literal tables = %s\n",
2774 (e_flags & EF_XTENSA_XT_LIT) ? "true" : "false");
2776 return _bfd_elf_print_private_bfd_data (abfd, farg);
2780 /* Set the right machine number for an Xtensa ELF file. */
2783 elf_xtensa_object_p (bfd *abfd)
2786 unsigned long arch = elf_elfheader (abfd)->e_flags & EF_XTENSA_MACH;
2791 mach = bfd_mach_xtensa;
2797 (void) bfd_default_set_arch_mach (abfd, bfd_arch_xtensa, mach);
2802 /* The final processing done just before writing out an Xtensa ELF object
2803 file. This gets the Xtensa architecture right based on the machine
2807 elf_xtensa_final_write_processing (bfd *abfd,
2808 bfd_boolean linker ATTRIBUTE_UNUSED)
2813 switch (mach = bfd_get_mach (abfd))
2815 case bfd_mach_xtensa:
2816 val = E_XTENSA_MACH;
2822 elf_elfheader (abfd)->e_flags &= (~ EF_XTENSA_MACH);
2823 elf_elfheader (abfd)->e_flags |= val;
2827 static enum elf_reloc_type_class
2828 elf_xtensa_reloc_type_class (const Elf_Internal_Rela *rela)
2830 switch ((int) ELF32_R_TYPE (rela->r_info))
2832 case R_XTENSA_RELATIVE:
2833 return reloc_class_relative;
2834 case R_XTENSA_JMP_SLOT:
2835 return reloc_class_plt;
2837 return reloc_class_normal;
2843 elf_xtensa_discard_info_for_section (bfd *abfd,
2844 struct elf_reloc_cookie *cookie,
2845 struct bfd_link_info *info,
2849 bfd_vma section_size;
2850 bfd_vma offset, actual_offset;
2851 bfd_size_type removed_bytes = 0;
2852 bfd_size_type entry_size;
2854 if (sec->output_section
2855 && bfd_is_abs_section (sec->output_section))
2858 if (xtensa_is_proptable_section (sec))
2863 section_size = sec->size;
2864 if (section_size == 0 || section_size % entry_size != 0)
2867 contents = retrieve_contents (abfd, sec, info->keep_memory);
2871 cookie->rels = retrieve_internal_relocs (abfd, sec, info->keep_memory);
2874 release_contents (sec, contents);
2878 /* Sort the relocations. They should already be in order when
2879 relaxation is enabled, but it might not be. */
2880 qsort (cookie->rels, sec->reloc_count, sizeof (Elf_Internal_Rela),
2881 internal_reloc_compare);
2883 cookie->rel = cookie->rels;
2884 cookie->relend = cookie->rels + sec->reloc_count;
2886 for (offset = 0; offset < section_size; offset += entry_size)
2888 actual_offset = offset - removed_bytes;
2890 /* The ...symbol_deleted_p function will skip over relocs but it
2891 won't adjust their offsets, so do that here. */
2892 while (cookie->rel < cookie->relend
2893 && cookie->rel->r_offset < offset)
2895 cookie->rel->r_offset -= removed_bytes;
2899 while (cookie->rel < cookie->relend
2900 && cookie->rel->r_offset == offset)
2902 if (bfd_elf_reloc_symbol_deleted_p (offset, cookie))
2904 /* Remove the table entry. (If the reloc type is NONE, then
2905 the entry has already been merged with another and deleted
2906 during relaxation.) */
2907 if (ELF32_R_TYPE (cookie->rel->r_info) != R_XTENSA_NONE)
2909 /* Shift the contents up. */
2910 if (offset + entry_size < section_size)
2911 memmove (&contents[actual_offset],
2912 &contents[actual_offset + entry_size],
2913 section_size - offset - entry_size);
2914 removed_bytes += entry_size;
2917 /* Remove this relocation. */
2918 cookie->rel->r_info = ELF32_R_INFO (0, R_XTENSA_NONE);
2921 /* Adjust the relocation offset for previous removals. This
2922 should not be done before calling ...symbol_deleted_p
2923 because it might mess up the offset comparisons there.
2924 Make sure the offset doesn't underflow in the case where
2925 the first entry is removed. */
2926 if (cookie->rel->r_offset >= removed_bytes)
2927 cookie->rel->r_offset -= removed_bytes;
2929 cookie->rel->r_offset = 0;
2935 if (removed_bytes != 0)
2937 /* Adjust any remaining relocs (shouldn't be any). */
2938 for (; cookie->rel < cookie->relend; cookie->rel++)
2940 if (cookie->rel->r_offset >= removed_bytes)
2941 cookie->rel->r_offset -= removed_bytes;
2943 cookie->rel->r_offset = 0;
2946 /* Clear the removed bytes. */
2947 memset (&contents[section_size - removed_bytes], 0, removed_bytes);
2949 pin_contents (sec, contents);
2950 pin_internal_relocs (sec, cookie->rels);
2953 sec->size = section_size - removed_bytes;
2955 if (xtensa_is_littable_section (sec))
2957 asection *sgotloc = elf_xtensa_hash_table (info)->sgotloc;
2959 sgotloc->size -= removed_bytes;
2964 release_contents (sec, contents);
2965 release_internal_relocs (sec, cookie->rels);
2968 return (removed_bytes != 0);
2973 elf_xtensa_discard_info (bfd *abfd,
2974 struct elf_reloc_cookie *cookie,
2975 struct bfd_link_info *info)
2978 bfd_boolean changed = FALSE;
2980 for (sec = abfd->sections; sec != NULL; sec = sec->next)
2982 if (xtensa_is_property_section (sec))
2984 if (elf_xtensa_discard_info_for_section (abfd, cookie, info, sec))
2994 elf_xtensa_ignore_discarded_relocs (asection *sec)
2996 return xtensa_is_property_section (sec);
3001 elf_xtensa_action_discarded (asection *sec)
3003 if (strcmp (".xt_except_table", sec->name) == 0)
3006 if (strcmp (".xt_except_desc", sec->name) == 0)
3009 return _bfd_elf_default_action_discarded (sec);
3013 /* Support for core dump NOTE sections. */
3016 elf_xtensa_grok_prstatus (bfd *abfd, Elf_Internal_Note *note)
3021 /* The size for Xtensa is variable, so don't try to recognize the format
3022 based on the size. Just assume this is GNU/Linux. */
3025 elf_tdata (abfd)->core_signal = bfd_get_16 (abfd, note->descdata + 12);
3028 elf_tdata (abfd)->core_pid = bfd_get_32 (abfd, note->descdata + 24);
3032 size = note->descsz - offset - 4;
3034 /* Make a ".reg/999" section. */
3035 return _bfd_elfcore_make_pseudosection (abfd, ".reg",
3036 size, note->descpos + offset);
3041 elf_xtensa_grok_psinfo (bfd *abfd, Elf_Internal_Note *note)
3043 switch (note->descsz)
3048 case 128: /* GNU/Linux elf_prpsinfo */
3049 elf_tdata (abfd)->core_program
3050 = _bfd_elfcore_strndup (abfd, note->descdata + 32, 16);
3051 elf_tdata (abfd)->core_command
3052 = _bfd_elfcore_strndup (abfd, note->descdata + 48, 80);
3055 /* Note that for some reason, a spurious space is tacked
3056 onto the end of the args in some (at least one anyway)
3057 implementations, so strip it off if it exists. */
3060 char *command = elf_tdata (abfd)->core_command;
3061 int n = strlen (command);
3063 if (0 < n && command[n - 1] == ' ')
3064 command[n - 1] = '\0';
3071 /* Generic Xtensa configurability stuff. */
3073 static xtensa_opcode callx0_op = XTENSA_UNDEFINED;
3074 static xtensa_opcode callx4_op = XTENSA_UNDEFINED;
3075 static xtensa_opcode callx8_op = XTENSA_UNDEFINED;
3076 static xtensa_opcode callx12_op = XTENSA_UNDEFINED;
3077 static xtensa_opcode call0_op = XTENSA_UNDEFINED;
3078 static xtensa_opcode call4_op = XTENSA_UNDEFINED;
3079 static xtensa_opcode call8_op = XTENSA_UNDEFINED;
3080 static xtensa_opcode call12_op = XTENSA_UNDEFINED;
3083 init_call_opcodes (void)
3085 if (callx0_op == XTENSA_UNDEFINED)
3087 callx0_op = xtensa_opcode_lookup (xtensa_default_isa, "callx0");
3088 callx4_op = xtensa_opcode_lookup (xtensa_default_isa, "callx4");
3089 callx8_op = xtensa_opcode_lookup (xtensa_default_isa, "callx8");
3090 callx12_op = xtensa_opcode_lookup (xtensa_default_isa, "callx12");
3091 call0_op = xtensa_opcode_lookup (xtensa_default_isa, "call0");
3092 call4_op = xtensa_opcode_lookup (xtensa_default_isa, "call4");
3093 call8_op = xtensa_opcode_lookup (xtensa_default_isa, "call8");
3094 call12_op = xtensa_opcode_lookup (xtensa_default_isa, "call12");
3100 is_indirect_call_opcode (xtensa_opcode opcode)
3102 init_call_opcodes ();
3103 return (opcode == callx0_op
3104 || opcode == callx4_op
3105 || opcode == callx8_op
3106 || opcode == callx12_op);
3111 is_direct_call_opcode (xtensa_opcode opcode)
3113 init_call_opcodes ();
3114 return (opcode == call0_op
3115 || opcode == call4_op
3116 || opcode == call8_op
3117 || opcode == call12_op);
3122 is_windowed_call_opcode (xtensa_opcode opcode)
3124 init_call_opcodes ();
3125 return (opcode == call4_op
3126 || opcode == call8_op
3127 || opcode == call12_op
3128 || opcode == callx4_op
3129 || opcode == callx8_op
3130 || opcode == callx12_op);
3134 static xtensa_opcode
3135 get_const16_opcode (void)
3137 static bfd_boolean done_lookup = FALSE;
3138 static xtensa_opcode const16_opcode = XTENSA_UNDEFINED;
3141 const16_opcode = xtensa_opcode_lookup (xtensa_default_isa, "const16");
3144 return const16_opcode;
3148 static xtensa_opcode
3149 get_l32r_opcode (void)
3151 static xtensa_opcode l32r_opcode = XTENSA_UNDEFINED;
3152 static bfd_boolean done_lookup = FALSE;
3156 l32r_opcode = xtensa_opcode_lookup (xtensa_default_isa, "l32r");
3164 l32r_offset (bfd_vma addr, bfd_vma pc)
3168 offset = addr - ((pc+3) & -4);
3169 BFD_ASSERT ((offset & ((1 << 2) - 1)) == 0);
3170 offset = (signed int) offset >> 2;
3171 BFD_ASSERT ((signed int) offset >> 16 == -1);
3177 get_relocation_opnd (xtensa_opcode opcode, int r_type)
3179 xtensa_isa isa = xtensa_default_isa;
3180 int last_immed, last_opnd, opi;
3182 if (opcode == XTENSA_UNDEFINED)
3183 return XTENSA_UNDEFINED;
3185 /* Find the last visible PC-relative immediate operand for the opcode.
3186 If there are no PC-relative immediates, then choose the last visible
3187 immediate; otherwise, fail and return XTENSA_UNDEFINED. */
3188 last_immed = XTENSA_UNDEFINED;
3189 last_opnd = xtensa_opcode_num_operands (isa, opcode);
3190 for (opi = last_opnd - 1; opi >= 0; opi--)
3192 if (xtensa_operand_is_visible (isa, opcode, opi) == 0)
3194 if (xtensa_operand_is_PCrelative (isa, opcode, opi) == 1)
3199 if (last_immed == XTENSA_UNDEFINED
3200 && xtensa_operand_is_register (isa, opcode, opi) == 0)
3204 return XTENSA_UNDEFINED;
3206 /* If the operand number was specified in an old-style relocation,
3207 check for consistency with the operand computed above. */
3208 if (r_type >= R_XTENSA_OP0 && r_type <= R_XTENSA_OP2)
3210 int reloc_opnd = r_type - R_XTENSA_OP0;
3211 if (reloc_opnd != last_immed)
3212 return XTENSA_UNDEFINED;
3220 get_relocation_slot (int r_type)
3230 if (r_type >= R_XTENSA_SLOT0_OP && r_type <= R_XTENSA_SLOT14_OP)
3231 return r_type - R_XTENSA_SLOT0_OP;
3232 if (r_type >= R_XTENSA_SLOT0_ALT && r_type <= R_XTENSA_SLOT14_ALT)
3233 return r_type - R_XTENSA_SLOT0_ALT;
3237 return XTENSA_UNDEFINED;
3241 /* Get the opcode for a relocation. */
3243 static xtensa_opcode
3244 get_relocation_opcode (bfd *abfd,
3247 Elf_Internal_Rela *irel)
3249 static xtensa_insnbuf ibuff = NULL;
3250 static xtensa_insnbuf sbuff = NULL;
3251 xtensa_isa isa = xtensa_default_isa;
3255 if (contents == NULL)
3256 return XTENSA_UNDEFINED;
3258 if (bfd_get_section_limit (abfd, sec) <= irel->r_offset)
3259 return XTENSA_UNDEFINED;
3263 ibuff = xtensa_insnbuf_alloc (isa);
3264 sbuff = xtensa_insnbuf_alloc (isa);
3267 /* Decode the instruction. */
3268 xtensa_insnbuf_from_chars (isa, ibuff, &contents[irel->r_offset],
3269 sec->size - irel->r_offset);
3270 fmt = xtensa_format_decode (isa, ibuff);
3271 slot = get_relocation_slot (ELF32_R_TYPE (irel->r_info));
3272 if (slot == XTENSA_UNDEFINED)
3273 return XTENSA_UNDEFINED;
3274 xtensa_format_get_slot (isa, fmt, slot, ibuff, sbuff);
3275 return xtensa_opcode_decode (isa, fmt, slot, sbuff);
3280 is_l32r_relocation (bfd *abfd,
3283 Elf_Internal_Rela *irel)
3285 xtensa_opcode opcode;
3286 if (!is_operand_relocation (ELF32_R_TYPE (irel->r_info)))
3288 opcode = get_relocation_opcode (abfd, sec, contents, irel);
3289 return (opcode == get_l32r_opcode ());
3293 static bfd_size_type
3294 get_asm_simplify_size (bfd_byte *contents,
3295 bfd_size_type content_len,
3296 bfd_size_type offset)
3298 bfd_size_type insnlen, size = 0;
3300 /* Decode the size of the next two instructions. */
3301 insnlen = insn_decode_len (contents, content_len, offset);
3307 insnlen = insn_decode_len (contents, content_len, offset + size);
3317 is_alt_relocation (int r_type)
3319 return (r_type >= R_XTENSA_SLOT0_ALT
3320 && r_type <= R_XTENSA_SLOT14_ALT);
3325 is_operand_relocation (int r_type)
3335 if (r_type >= R_XTENSA_SLOT0_OP && r_type <= R_XTENSA_SLOT14_OP)
3337 if (r_type >= R_XTENSA_SLOT0_ALT && r_type <= R_XTENSA_SLOT14_ALT)
3346 #define MIN_INSN_LENGTH 2
3348 /* Return 0 if it fails to decode. */
3351 insn_decode_len (bfd_byte *contents,
3352 bfd_size_type content_len,
3353 bfd_size_type offset)
3356 xtensa_isa isa = xtensa_default_isa;
3358 static xtensa_insnbuf ibuff = NULL;
3360 if (offset + MIN_INSN_LENGTH > content_len)
3364 ibuff = xtensa_insnbuf_alloc (isa);
3365 xtensa_insnbuf_from_chars (isa, ibuff, &contents[offset],
3366 content_len - offset);
3367 fmt = xtensa_format_decode (isa, ibuff);
3368 if (fmt == XTENSA_UNDEFINED)
3370 insn_len = xtensa_format_length (isa, fmt);
3371 if (insn_len == XTENSA_UNDEFINED)
3377 /* Decode the opcode for a single slot instruction.
3378 Return 0 if it fails to decode or the instruction is multi-slot. */
3381 insn_decode_opcode (bfd_byte *contents,
3382 bfd_size_type content_len,
3383 bfd_size_type offset,
3386 xtensa_isa isa = xtensa_default_isa;
3388 static xtensa_insnbuf insnbuf = NULL;
3389 static xtensa_insnbuf slotbuf = NULL;
3391 if (offset + MIN_INSN_LENGTH > content_len)
3392 return XTENSA_UNDEFINED;
3394 if (insnbuf == NULL)
3396 insnbuf = xtensa_insnbuf_alloc (isa);
3397 slotbuf = xtensa_insnbuf_alloc (isa);
3400 xtensa_insnbuf_from_chars (isa, insnbuf, &contents[offset],
3401 content_len - offset);
3402 fmt = xtensa_format_decode (isa, insnbuf);
3403 if (fmt == XTENSA_UNDEFINED)
3404 return XTENSA_UNDEFINED;
3406 if (slot >= xtensa_format_num_slots (isa, fmt))
3407 return XTENSA_UNDEFINED;
3409 xtensa_format_get_slot (isa, fmt, slot, insnbuf, slotbuf);
3410 return xtensa_opcode_decode (isa, fmt, slot, slotbuf);
3414 /* The offset is the offset in the contents.
3415 The address is the address of that offset. */
3418 check_branch_target_aligned (bfd_byte *contents,
3419 bfd_size_type content_length,
3423 bfd_size_type insn_len = insn_decode_len (contents, content_length, offset);
3426 return check_branch_target_aligned_address (address, insn_len);
3431 check_loop_aligned (bfd_byte *contents,
3432 bfd_size_type content_length,
3436 bfd_size_type loop_len, insn_len;
3437 xtensa_opcode opcode;
3439 opcode = insn_decode_opcode (contents, content_length, offset, 0);
3440 if (opcode == XTENSA_UNDEFINED
3441 || xtensa_opcode_is_loop (xtensa_default_isa, opcode) != 1)
3447 loop_len = insn_decode_len (contents, content_length, offset);
3448 insn_len = insn_decode_len (contents, content_length, offset + loop_len);
3449 if (loop_len == 0 || insn_len == 0)
3455 return check_branch_target_aligned_address (address + loop_len, insn_len);
3460 check_branch_target_aligned_address (bfd_vma addr, int len)
3463 return (addr % 8 == 0);
3464 return ((addr >> 2) == ((addr + len - 1) >> 2));
3468 /* Instruction widening and narrowing. */
3470 /* When FLIX is available we need to access certain instructions only
3471 when they are 16-bit or 24-bit instructions. This table caches
3472 information about such instructions by walking through all the
3473 opcodes and finding the smallest single-slot format into which each
3476 static xtensa_format *op_single_fmt_table = NULL;
3480 init_op_single_format_table (void)
3482 xtensa_isa isa = xtensa_default_isa;
3483 xtensa_insnbuf ibuf;
3484 xtensa_opcode opcode;
3488 if (op_single_fmt_table)
3491 ibuf = xtensa_insnbuf_alloc (isa);
3492 num_opcodes = xtensa_isa_num_opcodes (isa);
3494 op_single_fmt_table = (xtensa_format *)
3495 bfd_malloc (sizeof (xtensa_format) * num_opcodes);
3496 for (opcode = 0; opcode < num_opcodes; opcode++)
3498 op_single_fmt_table[opcode] = XTENSA_UNDEFINED;
3499 for (fmt = 0; fmt < xtensa_isa_num_formats (isa); fmt++)
3501 if (xtensa_format_num_slots (isa, fmt) == 1
3502 && xtensa_opcode_encode (isa, fmt, 0, ibuf, opcode) == 0)
3504 xtensa_opcode old_fmt = op_single_fmt_table[opcode];
3505 int fmt_length = xtensa_format_length (isa, fmt);
3506 if (old_fmt == XTENSA_UNDEFINED
3507 || fmt_length < xtensa_format_length (isa, old_fmt))
3508 op_single_fmt_table[opcode] = fmt;
3512 xtensa_insnbuf_free (isa, ibuf);
3516 static xtensa_format
3517 get_single_format (xtensa_opcode opcode)
3519 init_op_single_format_table ();
3520 return op_single_fmt_table[opcode];
3524 /* For the set of narrowable instructions we do NOT include the
3525 narrowings beqz -> beqz.n or bnez -> bnez.n because of complexities
3526 involved during linker relaxation that may require these to
3527 re-expand in some conditions. Also, the narrowing "or" -> mov.n
3528 requires special case code to ensure it only works when op1 == op2. */
3536 struct string_pair narrowable[] =
3539 { "addi", "addi.n" },
3540 { "addmi", "addi.n" },
3541 { "l32i", "l32i.n" },
3542 { "movi", "movi.n" },
3544 { "retw", "retw.n" },
3545 { "s32i", "s32i.n" },
3546 { "or", "mov.n" } /* special case only when op1 == op2 */
3549 struct string_pair widenable[] =
3552 { "addi", "addi.n" },
3553 { "addmi", "addi.n" },
3554 { "beqz", "beqz.n" },
3555 { "bnez", "bnez.n" },
3556 { "l32i", "l32i.n" },
3557 { "movi", "movi.n" },
3559 { "retw", "retw.n" },
3560 { "s32i", "s32i.n" },
3561 { "or", "mov.n" } /* special case only when op1 == op2 */
3565 /* Check if an instruction can be "narrowed", i.e., changed from a standard
3566 3-byte instruction to a 2-byte "density" instruction. If it is valid,
3567 return the instruction buffer holding the narrow instruction. Otherwise,
3568 return 0. The set of valid narrowing are specified by a string table
3569 but require some special case operand checks in some cases. */
3571 static xtensa_insnbuf
3572 can_narrow_instruction (xtensa_insnbuf slotbuf,
3574 xtensa_opcode opcode)
3576 xtensa_isa isa = xtensa_default_isa;
3577 xtensa_format o_fmt;
3580 static xtensa_insnbuf o_insnbuf = NULL;
3581 static xtensa_insnbuf o_slotbuf = NULL;
3583 if (o_insnbuf == NULL)
3585 o_insnbuf = xtensa_insnbuf_alloc (isa);
3586 o_slotbuf = xtensa_insnbuf_alloc (isa);
3589 for (opi = 0; opi < (sizeof (narrowable)/sizeof (struct string_pair)); opi++)
3591 bfd_boolean is_or = (strcmp ("or", narrowable[opi].wide) == 0);
3593 if (opcode == xtensa_opcode_lookup (isa, narrowable[opi].wide))
3595 uint32 value, newval;
3596 int i, operand_count, o_operand_count;
3597 xtensa_opcode o_opcode;
3599 /* Address does not matter in this case. We might need to
3600 fix it to handle branches/jumps. */
3601 bfd_vma self_address = 0;
3603 o_opcode = xtensa_opcode_lookup (isa, narrowable[opi].narrow);
3604 if (o_opcode == XTENSA_UNDEFINED)
3606 o_fmt = get_single_format (o_opcode);
3607 if (o_fmt == XTENSA_UNDEFINED)
3610 if (xtensa_format_length (isa, fmt) != 3
3611 || xtensa_format_length (isa, o_fmt) != 2)
3614 xtensa_format_encode (isa, o_fmt, o_insnbuf);
3615 operand_count = xtensa_opcode_num_operands (isa, opcode);
3616 o_operand_count = xtensa_opcode_num_operands (isa, o_opcode);
3618 if (xtensa_opcode_encode (isa, o_fmt, 0, o_slotbuf, o_opcode) != 0)
3623 if (xtensa_opcode_num_operands (isa, o_opcode) != operand_count)
3628 uint32 rawval0, rawval1, rawval2;
3630 if (o_operand_count + 1 != operand_count
3631 || xtensa_operand_get_field (isa, opcode, 0,
3632 fmt, 0, slotbuf, &rawval0) != 0
3633 || xtensa_operand_get_field (isa, opcode, 1,
3634 fmt, 0, slotbuf, &rawval1) != 0
3635 || xtensa_operand_get_field (isa, opcode, 2,
3636 fmt, 0, slotbuf, &rawval2) != 0
3637 || rawval1 != rawval2
3638 || rawval0 == rawval1 /* it is a nop */)
3642 for (i = 0; i < o_operand_count; ++i)
3644 if (xtensa_operand_get_field (isa, opcode, i, fmt, 0,
3646 || xtensa_operand_decode (isa, opcode, i, &value))
3649 /* PC-relative branches need adjustment, but
3650 the PC-rel operand will always have a relocation. */
3652 if (xtensa_operand_do_reloc (isa, o_opcode, i, &newval,
3654 || xtensa_operand_encode (isa, o_opcode, i, &newval)
3655 || xtensa_operand_set_field (isa, o_opcode, i, o_fmt, 0,
3660 if (xtensa_format_set_slot (isa, o_fmt, 0, o_insnbuf, o_slotbuf))
3670 /* Attempt to narrow an instruction. If the narrowing is valid, perform
3671 the action in-place directly into the contents and return TRUE. Otherwise,
3672 the return value is FALSE and the contents are not modified. */
3675 narrow_instruction (bfd_byte *contents,
3676 bfd_size_type content_length,
3677 bfd_size_type offset)
3679 xtensa_opcode opcode;
3680 bfd_size_type insn_len;
3681 xtensa_isa isa = xtensa_default_isa;
3683 xtensa_insnbuf o_insnbuf;
3685 static xtensa_insnbuf insnbuf = NULL;
3686 static xtensa_insnbuf slotbuf = NULL;
3688 if (insnbuf == NULL)
3690 insnbuf = xtensa_insnbuf_alloc (isa);
3691 slotbuf = xtensa_insnbuf_alloc (isa);
3694 BFD_ASSERT (offset < content_length);
3696 if (content_length < 2)
3699 /* We will hand-code a few of these for a little while.
3700 These have all been specified in the assembler aleady. */
3701 xtensa_insnbuf_from_chars (isa, insnbuf, &contents[offset],
3702 content_length - offset);
3703 fmt = xtensa_format_decode (isa, insnbuf);
3704 if (xtensa_format_num_slots (isa, fmt) != 1)
3707 if (xtensa_format_get_slot (isa, fmt, 0, insnbuf, slotbuf) != 0)
3710 opcode = xtensa_opcode_decode (isa, fmt, 0, slotbuf);
3711 if (opcode == XTENSA_UNDEFINED)
3713 insn_len = xtensa_format_length (isa, fmt);
3714 if (insn_len > content_length)
3717 o_insnbuf = can_narrow_instruction (slotbuf, fmt, opcode);
3720 xtensa_insnbuf_to_chars (isa, o_insnbuf, contents + offset,
3721 content_length - offset);
3729 /* Check if an instruction can be "widened", i.e., changed from a 2-byte
3730 "density" instruction to a standard 3-byte instruction. If it is valid,
3731 return the instruction buffer holding the wide instruction. Otherwise,
3732 return 0. The set of valid widenings are specified by a string table
3733 but require some special case operand checks in some cases. */
3735 static xtensa_insnbuf
3736 can_widen_instruction (xtensa_insnbuf slotbuf,
3738 xtensa_opcode opcode)
3740 xtensa_isa isa = xtensa_default_isa;
3741 xtensa_format o_fmt;
3744 static xtensa_insnbuf o_insnbuf = NULL;
3745 static xtensa_insnbuf o_slotbuf = NULL;
3747 if (o_insnbuf == NULL)
3749 o_insnbuf = xtensa_insnbuf_alloc (isa);
3750 o_slotbuf = xtensa_insnbuf_alloc (isa);
3753 for (opi = 0; opi < (sizeof (widenable)/sizeof (struct string_pair)); opi++)
3755 bfd_boolean is_or = (strcmp ("or", widenable[opi].wide) == 0);
3756 bfd_boolean is_branch = (strcmp ("beqz", widenable[opi].wide) == 0
3757 || strcmp ("bnez", widenable[opi].wide) == 0);
3759 if (opcode == xtensa_opcode_lookup (isa, widenable[opi].narrow))
3761 uint32 value, newval;
3762 int i, operand_count, o_operand_count, check_operand_count;
3763 xtensa_opcode o_opcode;
3765 /* Address does not matter in this case. We might need to fix it
3766 to handle branches/jumps. */
3767 bfd_vma self_address = 0;
3769 o_opcode = xtensa_opcode_lookup (isa, widenable[opi].wide);
3770 if (o_opcode == XTENSA_UNDEFINED)
3772 o_fmt = get_single_format (o_opcode);
3773 if (o_fmt == XTENSA_UNDEFINED)
3776 if (xtensa_format_length (isa, fmt) != 2
3777 || xtensa_format_length (isa, o_fmt) != 3)
3780 xtensa_format_encode (isa, o_fmt, o_insnbuf);
3781 operand_count = xtensa_opcode_num_operands (isa, opcode);
3782 o_operand_count = xtensa_opcode_num_operands (isa, o_opcode);
3783 check_operand_count = o_operand_count;
3785 if (xtensa_opcode_encode (isa, o_fmt, 0, o_slotbuf, o_opcode) != 0)
3790 if (xtensa_opcode_num_operands (isa, o_opcode) != operand_count)
3795 uint32 rawval0, rawval1;
3797 if (o_operand_count != operand_count + 1
3798 || xtensa_operand_get_field (isa, opcode, 0,
3799 fmt, 0, slotbuf, &rawval0) != 0
3800 || xtensa_operand_get_field (isa, opcode, 1,
3801 fmt, 0, slotbuf, &rawval1) != 0
3802 || rawval0 == rawval1 /* it is a nop */)
3806 check_operand_count--;
3808 for (i = 0; i < check_operand_count; i++)
3811 if (is_or && i == o_operand_count - 1)
3813 if (xtensa_operand_get_field (isa, opcode, new_i, fmt, 0,
3815 || xtensa_operand_decode (isa, opcode, new_i, &value))
3818 /* PC-relative branches need adjustment, but
3819 the PC-rel operand will always have a relocation. */
3821 if (xtensa_operand_do_reloc (isa, o_opcode, i, &newval,
3823 || xtensa_operand_encode (isa, o_opcode, i, &newval)
3824 || xtensa_operand_set_field (isa, o_opcode, i, o_fmt, 0,
3829 if (xtensa_format_set_slot (isa, o_fmt, 0, o_insnbuf, o_slotbuf))
3839 /* Attempt to widen an instruction. If the widening is valid, perform
3840 the action in-place directly into the contents and return TRUE. Otherwise,
3841 the return value is FALSE and the contents are not modified. */
3844 widen_instruction (bfd_byte *contents,
3845 bfd_size_type content_length,
3846 bfd_size_type offset)
3848 xtensa_opcode opcode;
3849 bfd_size_type insn_len;
3850 xtensa_isa isa = xtensa_default_isa;
3852 xtensa_insnbuf o_insnbuf;
3854 static xtensa_insnbuf insnbuf = NULL;
3855 static xtensa_insnbuf slotbuf = NULL;
3857 if (insnbuf == NULL)
3859 insnbuf = xtensa_insnbuf_alloc (isa);
3860 slotbuf = xtensa_insnbuf_alloc (isa);
3863 BFD_ASSERT (offset < content_length);
3865 if (content_length < 2)
3868 /* We will hand-code a few of these for a little while.
3869 These have all been specified in the assembler aleady. */
3870 xtensa_insnbuf_from_chars (isa, insnbuf, &contents[offset],
3871 content_length - offset);
3872 fmt = xtensa_format_decode (isa, insnbuf);
3873 if (xtensa_format_num_slots (isa, fmt) != 1)
3876 if (xtensa_format_get_slot (isa, fmt, 0, insnbuf, slotbuf) != 0)
3879 opcode = xtensa_opcode_decode (isa, fmt, 0, slotbuf);
3880 if (opcode == XTENSA_UNDEFINED)
3882 insn_len = xtensa_format_length (isa, fmt);
3883 if (insn_len > content_length)
3886 o_insnbuf = can_widen_instruction (slotbuf, fmt, opcode);
3889 xtensa_insnbuf_to_chars (isa, o_insnbuf, contents + offset,
3890 content_length - offset);
3897 /* Code for transforming CALLs at link-time. */
3899 static bfd_reloc_status_type
3900 elf_xtensa_do_asm_simplify (bfd_byte *contents,
3902 bfd_vma content_length,
3903 char **error_message)
3905 static xtensa_insnbuf insnbuf = NULL;
3906 static xtensa_insnbuf slotbuf = NULL;
3907 xtensa_format core_format = XTENSA_UNDEFINED;
3908 xtensa_opcode opcode;
3909 xtensa_opcode direct_call_opcode;
3910 xtensa_isa isa = xtensa_default_isa;
3911 bfd_byte *chbuf = contents + address;
3914 if (insnbuf == NULL)
3916 insnbuf = xtensa_insnbuf_alloc (isa);
3917 slotbuf = xtensa_insnbuf_alloc (isa);
3920 if (content_length < address)
3922 *error_message = _("Attempt to convert L32R/CALLX to CALL failed");
3923 return bfd_reloc_other;
3926 opcode = get_expanded_call_opcode (chbuf, content_length - address, 0);
3927 direct_call_opcode = swap_callx_for_call_opcode (opcode);
3928 if (direct_call_opcode == XTENSA_UNDEFINED)
3930 *error_message = _("Attempt to convert L32R/CALLX to CALL failed");
3931 return bfd_reloc_other;
3934 /* Assemble a NOP ("or a1, a1, a1") into the 0 byte offset. */
3935 core_format = xtensa_format_lookup (isa, "x24");
3936 opcode = xtensa_opcode_lookup (isa, "or");
3937 xtensa_opcode_encode (isa, core_format, 0, slotbuf, opcode);
3938 for (opn = 0; opn < 3; opn++)
3941 xtensa_operand_encode (isa, opcode, opn, ®no);
3942 xtensa_operand_set_field (isa, opcode, opn, core_format, 0,
3945 xtensa_format_encode (isa, core_format, insnbuf);
3946 xtensa_format_set_slot (isa, core_format, 0, insnbuf, slotbuf);
3947 xtensa_insnbuf_to_chars (isa, insnbuf, chbuf, content_length - address);
3949 /* Assemble a CALL ("callN 0") into the 3 byte offset. */
3950 xtensa_opcode_encode (isa, core_format, 0, slotbuf, direct_call_opcode);
3951 xtensa_operand_set_field (isa, opcode, 0, core_format, 0, slotbuf, 0);
3953 xtensa_format_encode (isa, core_format, insnbuf);
3954 xtensa_format_set_slot (isa, core_format, 0, insnbuf, slotbuf);
3955 xtensa_insnbuf_to_chars (isa, insnbuf, chbuf + 3,
3956 content_length - address - 3);
3958 return bfd_reloc_ok;
3962 static bfd_reloc_status_type
3963 contract_asm_expansion (bfd_byte *contents,
3964 bfd_vma content_length,
3965 Elf_Internal_Rela *irel,
3966 char **error_message)
3968 bfd_reloc_status_type retval =
3969 elf_xtensa_do_asm_simplify (contents, irel->r_offset, content_length,
3972 if (retval != bfd_reloc_ok)
3973 return bfd_reloc_dangerous;
3975 /* Update the irel->r_offset field so that the right immediate and
3976 the right instruction are modified during the relocation. */
3977 irel->r_offset += 3;
3978 irel->r_info = ELF32_R_INFO (ELF32_R_SYM (irel->r_info), R_XTENSA_SLOT0_OP);
3979 return bfd_reloc_ok;
3983 static xtensa_opcode
3984 swap_callx_for_call_opcode (xtensa_opcode opcode)
3986 init_call_opcodes ();
3988 if (opcode == callx0_op) return call0_op;
3989 if (opcode == callx4_op) return call4_op;
3990 if (opcode == callx8_op) return call8_op;
3991 if (opcode == callx12_op) return call12_op;
3993 /* Return XTENSA_UNDEFINED if the opcode is not an indirect call. */
3994 return XTENSA_UNDEFINED;
3998 /* Check if "buf" is pointing to a "L32R aN; CALLX aN" or "CONST16 aN;
3999 CONST16 aN; CALLX aN" sequence, and if so, return the CALLX opcode.
4000 If not, return XTENSA_UNDEFINED. */
4002 #define L32R_TARGET_REG_OPERAND 0
4003 #define CONST16_TARGET_REG_OPERAND 0
4004 #define CALLN_SOURCE_OPERAND 0
4006 static xtensa_opcode
4007 get_expanded_call_opcode (bfd_byte *buf, int bufsize, bfd_boolean *p_uses_l32r)
4009 static xtensa_insnbuf insnbuf = NULL;
4010 static xtensa_insnbuf slotbuf = NULL;
4012 xtensa_opcode opcode;
4013 xtensa_isa isa = xtensa_default_isa;
4014 uint32 regno, const16_regno, call_regno;
4017 if (insnbuf == NULL)
4019 insnbuf = xtensa_insnbuf_alloc (isa);
4020 slotbuf = xtensa_insnbuf_alloc (isa);
4023 xtensa_insnbuf_from_chars (isa, insnbuf, buf, bufsize);
4024 fmt = xtensa_format_decode (isa, insnbuf);
4025 if (fmt == XTENSA_UNDEFINED
4026 || xtensa_format_get_slot (isa, fmt, 0, insnbuf, slotbuf))
4027 return XTENSA_UNDEFINED;
4029 opcode = xtensa_opcode_decode (isa, fmt, 0, slotbuf);
4030 if (opcode == XTENSA_UNDEFINED)
4031 return XTENSA_UNDEFINED;
4033 if (opcode == get_l32r_opcode ())
4036 *p_uses_l32r = TRUE;
4037 if (xtensa_operand_get_field (isa, opcode, L32R_TARGET_REG_OPERAND,
4038 fmt, 0, slotbuf, ®no)
4039 || xtensa_operand_decode (isa, opcode, L32R_TARGET_REG_OPERAND,
4041 return XTENSA_UNDEFINED;
4043 else if (opcode == get_const16_opcode ())
4046 *p_uses_l32r = FALSE;
4047 if (xtensa_operand_get_field (isa, opcode, CONST16_TARGET_REG_OPERAND,
4048 fmt, 0, slotbuf, ®no)
4049 || xtensa_operand_decode (isa, opcode, CONST16_TARGET_REG_OPERAND,
4051 return XTENSA_UNDEFINED;
4053 /* Check that the next instruction is also CONST16. */
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 != get_const16_opcode ())
4062 return XTENSA_UNDEFINED;
4064 if (xtensa_operand_get_field (isa, opcode, CONST16_TARGET_REG_OPERAND,
4065 fmt, 0, slotbuf, &const16_regno)
4066 || xtensa_operand_decode (isa, opcode, CONST16_TARGET_REG_OPERAND,
4068 || const16_regno != regno)
4069 return XTENSA_UNDEFINED;
4072 return XTENSA_UNDEFINED;
4074 /* Next instruction should be an CALLXn with operand 0 == regno. */
4075 offset += xtensa_format_length (isa, fmt);
4076 xtensa_insnbuf_from_chars (isa, insnbuf, buf + offset, bufsize - offset);
4077 fmt = xtensa_format_decode (isa, insnbuf);
4078 if (fmt == XTENSA_UNDEFINED
4079 || xtensa_format_get_slot (isa, fmt, 0, insnbuf, slotbuf))
4080 return XTENSA_UNDEFINED;
4081 opcode = xtensa_opcode_decode (isa, fmt, 0, slotbuf);
4082 if (opcode == XTENSA_UNDEFINED
4083 || !is_indirect_call_opcode (opcode))
4084 return XTENSA_UNDEFINED;
4086 if (xtensa_operand_get_field (isa, opcode, CALLN_SOURCE_OPERAND,
4087 fmt, 0, slotbuf, &call_regno)
4088 || xtensa_operand_decode (isa, opcode, CALLN_SOURCE_OPERAND,
4090 return XTENSA_UNDEFINED;
4092 if (call_regno != regno)
4093 return XTENSA_UNDEFINED;
4099 /* Data structures used during relaxation. */
4101 /* r_reloc: relocation values. */
4103 /* Through the relaxation process, we need to keep track of the values
4104 that will result from evaluating relocations. The standard ELF
4105 relocation structure is not sufficient for this purpose because we're
4106 operating on multiple input files at once, so we need to know which
4107 input file a relocation refers to. The r_reloc structure thus
4108 records both the input file (bfd) and ELF relocation.
4110 For efficiency, an r_reloc also contains a "target_offset" field to
4111 cache the target-section-relative offset value that is represented by
4114 The r_reloc also contains a virtual offset that allows multiple
4115 inserted literals to be placed at the same "address" with
4116 different offsets. */
4118 typedef struct r_reloc_struct r_reloc;
4120 struct r_reloc_struct
4123 Elf_Internal_Rela rela;
4124 bfd_vma target_offset;
4125 bfd_vma virtual_offset;
4129 /* The r_reloc structure is included by value in literal_value, but not
4130 every literal_value has an associated relocation -- some are simple
4131 constants. In such cases, we set all the fields in the r_reloc
4132 struct to zero. The r_reloc_is_const function should be used to
4133 detect this case. */
4136 r_reloc_is_const (const r_reloc *r_rel)
4138 return (r_rel->abfd == NULL);
4143 r_reloc_get_target_offset (const r_reloc *r_rel)
4145 bfd_vma target_offset;
4146 unsigned long r_symndx;
4148 BFD_ASSERT (!r_reloc_is_const (r_rel));
4149 r_symndx = ELF32_R_SYM (r_rel->rela.r_info);
4150 target_offset = get_elf_r_symndx_offset (r_rel->abfd, r_symndx);
4151 return (target_offset + r_rel->rela.r_addend);
4155 static struct elf_link_hash_entry *
4156 r_reloc_get_hash_entry (const r_reloc *r_rel)
4158 unsigned long r_symndx = ELF32_R_SYM (r_rel->rela.r_info);
4159 return get_elf_r_symndx_hash_entry (r_rel->abfd, r_symndx);
4164 r_reloc_get_section (const r_reloc *r_rel)
4166 unsigned long r_symndx = ELF32_R_SYM (r_rel->rela.r_info);
4167 return get_elf_r_symndx_section (r_rel->abfd, r_symndx);
4172 r_reloc_is_defined (const r_reloc *r_rel)
4178 sec = r_reloc_get_section (r_rel);
4179 if (sec == bfd_abs_section_ptr
4180 || sec == bfd_com_section_ptr
4181 || sec == bfd_und_section_ptr)
4188 r_reloc_init (r_reloc *r_rel,
4190 Elf_Internal_Rela *irel,
4192 bfd_size_type content_length)
4195 reloc_howto_type *howto;
4199 r_rel->rela = *irel;
4201 r_rel->target_offset = r_reloc_get_target_offset (r_rel);
4202 r_rel->virtual_offset = 0;
4203 r_type = ELF32_R_TYPE (r_rel->rela.r_info);
4204 howto = &elf_howto_table[r_type];
4205 if (howto->partial_inplace)
4207 bfd_vma inplace_val;
4208 BFD_ASSERT (r_rel->rela.r_offset < content_length);
4210 inplace_val = bfd_get_32 (abfd, &contents[r_rel->rela.r_offset]);
4211 r_rel->target_offset += inplace_val;
4215 memset (r_rel, 0, sizeof (r_reloc));
4222 print_r_reloc (FILE *fp, const r_reloc *r_rel)
4224 if (r_reloc_is_defined (r_rel))
4226 asection *sec = r_reloc_get_section (r_rel);
4227 fprintf (fp, " %s(%s + ", sec->owner->filename, sec->name);
4229 else if (r_reloc_get_hash_entry (r_rel))
4230 fprintf (fp, " %s + ", r_reloc_get_hash_entry (r_rel)->root.root.string);
4232 fprintf (fp, " ?? + ");
4234 fprintf_vma (fp, r_rel->target_offset);
4235 if (r_rel->virtual_offset)
4237 fprintf (fp, " + ");
4238 fprintf_vma (fp, r_rel->virtual_offset);
4247 /* source_reloc: relocations that reference literals. */
4249 /* To determine whether literals can be coalesced, we need to first
4250 record all the relocations that reference the literals. The
4251 source_reloc structure below is used for this purpose. The
4252 source_reloc entries are kept in a per-literal-section array, sorted
4253 by offset within the literal section (i.e., target offset).
4255 The source_sec and r_rel.rela.r_offset fields identify the source of
4256 the relocation. The r_rel field records the relocation value, i.e.,
4257 the offset of the literal being referenced. The opnd field is needed
4258 to determine the range of the immediate field to which the relocation
4259 applies, so we can determine whether another literal with the same
4260 value is within range. The is_null field is true when the relocation
4261 is being removed (e.g., when an L32R is being removed due to a CALLX
4262 that is converted to a direct CALL). */
4264 typedef struct source_reloc_struct source_reloc;
4266 struct source_reloc_struct
4268 asection *source_sec;
4270 xtensa_opcode opcode;
4272 bfd_boolean is_null;
4273 bfd_boolean is_abs_literal;
4278 init_source_reloc (source_reloc *reloc,
4279 asection *source_sec,
4280 const r_reloc *r_rel,
4281 xtensa_opcode opcode,
4283 bfd_boolean is_abs_literal)
4285 reloc->source_sec = source_sec;
4286 reloc->r_rel = *r_rel;
4287 reloc->opcode = opcode;
4289 reloc->is_null = FALSE;
4290 reloc->is_abs_literal = is_abs_literal;
4294 /* Find the source_reloc for a particular source offset and relocation
4295 type. Note that the array is sorted by _target_ offset, so this is
4296 just a linear search. */
4298 static source_reloc *
4299 find_source_reloc (source_reloc *src_relocs,
4302 Elf_Internal_Rela *irel)
4306 for (i = 0; i < src_count; i++)
4308 if (src_relocs[i].source_sec == sec
4309 && src_relocs[i].r_rel.rela.r_offset == irel->r_offset
4310 && (ELF32_R_TYPE (src_relocs[i].r_rel.rela.r_info)
4311 == ELF32_R_TYPE (irel->r_info)))
4312 return &src_relocs[i];
4320 source_reloc_compare (const void *ap, const void *bp)
4322 const source_reloc *a = (const source_reloc *) ap;
4323 const source_reloc *b = (const source_reloc *) bp;
4325 if (a->r_rel.target_offset != b->r_rel.target_offset)
4326 return (a->r_rel.target_offset - b->r_rel.target_offset);
4328 /* We don't need to sort on these criteria for correctness,
4329 but enforcing a more strict ordering prevents unstable qsort
4330 from behaving differently with different implementations.
4331 Without the code below we get correct but different results
4332 on Solaris 2.7 and 2.8. We would like to always produce the
4333 same results no matter the host. */
4335 if ((!a->is_null) - (!b->is_null))
4336 return ((!a->is_null) - (!b->is_null));
4337 return internal_reloc_compare (&a->r_rel.rela, &b->r_rel.rela);
4341 /* Literal values and value hash tables. */
4343 /* Literals with the same value can be coalesced. The literal_value
4344 structure records the value of a literal: the "r_rel" field holds the
4345 information from the relocation on the literal (if there is one) and
4346 the "value" field holds the contents of the literal word itself.
4348 The value_map structure records a literal value along with the
4349 location of a literal holding that value. The value_map hash table
4350 is indexed by the literal value, so that we can quickly check if a
4351 particular literal value has been seen before and is thus a candidate
4354 typedef struct literal_value_struct literal_value;
4355 typedef struct value_map_struct value_map;
4356 typedef struct value_map_hash_table_struct value_map_hash_table;
4358 struct literal_value_struct
4361 unsigned long value;
4362 bfd_boolean is_abs_literal;
4365 struct value_map_struct
4367 literal_value val; /* The literal value. */
4368 r_reloc loc; /* Location of the literal. */
4372 struct value_map_hash_table_struct
4374 unsigned bucket_count;
4375 value_map **buckets;
4377 bfd_boolean has_last_loc;
4383 init_literal_value (literal_value *lit,
4384 const r_reloc *r_rel,
4385 unsigned long value,
4386 bfd_boolean is_abs_literal)
4388 lit->r_rel = *r_rel;
4390 lit->is_abs_literal = is_abs_literal;
4395 literal_value_equal (const literal_value *src1,
4396 const literal_value *src2,
4397 bfd_boolean final_static_link)
4399 struct elf_link_hash_entry *h1, *h2;
4401 if (r_reloc_is_const (&src1->r_rel) != r_reloc_is_const (&src2->r_rel))
4404 if (r_reloc_is_const (&src1->r_rel))
4405 return (src1->value == src2->value);
4407 if (ELF32_R_TYPE (src1->r_rel.rela.r_info)
4408 != ELF32_R_TYPE (src2->r_rel.rela.r_info))
4411 if (src1->r_rel.target_offset != src2->r_rel.target_offset)
4414 if (src1->r_rel.virtual_offset != src2->r_rel.virtual_offset)
4417 if (src1->value != src2->value)
4420 /* Now check for the same section (if defined) or the same elf_hash
4421 (if undefined or weak). */
4422 h1 = r_reloc_get_hash_entry (&src1->r_rel);
4423 h2 = r_reloc_get_hash_entry (&src2->r_rel);
4424 if (r_reloc_is_defined (&src1->r_rel)
4425 && (final_static_link
4426 || ((!h1 || h1->root.type != bfd_link_hash_defweak)
4427 && (!h2 || h2->root.type != bfd_link_hash_defweak))))
4429 if (r_reloc_get_section (&src1->r_rel)
4430 != r_reloc_get_section (&src2->r_rel))
4435 /* Require that the hash entries (i.e., symbols) be identical. */
4436 if (h1 != h2 || h1 == 0)
4440 if (src1->is_abs_literal != src2->is_abs_literal)
4447 /* Must be power of 2. */
4448 #define INITIAL_HASH_RELOC_BUCKET_COUNT 1024
4450 static value_map_hash_table *
4451 value_map_hash_table_init (void)
4453 value_map_hash_table *values;
4455 values = (value_map_hash_table *)
4456 bfd_zmalloc (sizeof (value_map_hash_table));
4457 values->bucket_count = INITIAL_HASH_RELOC_BUCKET_COUNT;
4459 values->buckets = (value_map **)
4460 bfd_zmalloc (sizeof (value_map *) * values->bucket_count);
4461 if (values->buckets == NULL)
4466 values->has_last_loc = FALSE;
4473 value_map_hash_table_delete (value_map_hash_table *table)
4475 free (table->buckets);
4481 hash_bfd_vma (bfd_vma val)
4483 return (val >> 2) + (val >> 10);
4488 literal_value_hash (const literal_value *src)
4492 hash_val = hash_bfd_vma (src->value);
4493 if (!r_reloc_is_const (&src->r_rel))
4497 hash_val += hash_bfd_vma (src->is_abs_literal * 1000);
4498 hash_val += hash_bfd_vma (src->r_rel.target_offset);
4499 hash_val += hash_bfd_vma (src->r_rel.virtual_offset);
4501 /* Now check for the same section and the same elf_hash. */
4502 if (r_reloc_is_defined (&src->r_rel))
4503 sec_or_hash = r_reloc_get_section (&src->r_rel);
4505 sec_or_hash = r_reloc_get_hash_entry (&src->r_rel);
4506 hash_val += hash_bfd_vma ((bfd_vma) (size_t) sec_or_hash);
4512 /* Check if the specified literal_value has been seen before. */
4515 value_map_get_cached_value (value_map_hash_table *map,
4516 const literal_value *val,
4517 bfd_boolean final_static_link)
4523 idx = literal_value_hash (val);
4524 idx = idx & (map->bucket_count - 1);
4525 bucket = map->buckets[idx];
4526 for (map_e = bucket; map_e; map_e = map_e->next)
4528 if (literal_value_equal (&map_e->val, val, final_static_link))
4535 /* Record a new literal value. It is illegal to call this if VALUE
4536 already has an entry here. */
4539 add_value_map (value_map_hash_table *map,
4540 const literal_value *val,
4542 bfd_boolean final_static_link)
4544 value_map **bucket_p;
4547 value_map *val_e = (value_map *) bfd_zmalloc (sizeof (value_map));
4550 bfd_set_error (bfd_error_no_memory);
4554 BFD_ASSERT (!value_map_get_cached_value (map, val, final_static_link));
4558 idx = literal_value_hash (val);
4559 idx = idx & (map->bucket_count - 1);
4560 bucket_p = &map->buckets[idx];
4562 val_e->next = *bucket_p;
4565 /* FIXME: Consider resizing the hash table if we get too many entries. */
4571 /* Lists of text actions (ta_) for narrowing, widening, longcall
4572 conversion, space fill, code & literal removal, etc. */
4574 /* The following text actions are generated:
4576 "ta_remove_insn" remove an instruction or instructions
4577 "ta_remove_longcall" convert longcall to call
4578 "ta_convert_longcall" convert longcall to nop/call
4579 "ta_narrow_insn" narrow a wide instruction
4580 "ta_widen" widen a narrow instruction
4581 "ta_fill" add fill or remove fill
4582 removed < 0 is a fill; branches to the fill address will be
4583 changed to address + fill size (e.g., address - removed)
4584 removed >= 0 branches to the fill address will stay unchanged
4585 "ta_remove_literal" remove a literal; this action is
4586 indicated when a literal is removed
4588 "ta_add_literal" insert a new literal; this action is
4589 indicated when a literal has been moved.
4590 It may use a virtual_offset because
4591 multiple literals can be placed at the
4594 For each of these text actions, we also record the number of bytes
4595 removed by performing the text action. In the case of a "ta_widen"
4596 or a "ta_fill" that adds space, the removed_bytes will be negative. */
4598 typedef struct text_action_struct text_action;
4599 typedef struct text_action_list_struct text_action_list;
4600 typedef enum text_action_enum_t text_action_t;
4602 enum text_action_enum_t
4605 ta_remove_insn, /* removed = -size */
4606 ta_remove_longcall, /* removed = -size */
4607 ta_convert_longcall, /* removed = 0 */
4608 ta_narrow_insn, /* removed = -1 */
4609 ta_widen_insn, /* removed = +1 */
4610 ta_fill, /* removed = +size */
4616 /* Structure for a text action record. */
4617 struct text_action_struct
4619 text_action_t action;
4620 asection *sec; /* Optional */
4622 bfd_vma virtual_offset; /* Zero except for adding literals. */
4624 literal_value value; /* Only valid when adding literals. */
4630 /* List of all of the actions taken on a text section. */
4631 struct text_action_list_struct
4637 static text_action *
4638 find_fill_action (text_action_list *l, asection *sec, bfd_vma offset)
4642 /* It is not necessary to fill at the end of a section. */
4643 if (sec->size == offset)
4646 for (m_p = &l->head; *m_p && (*m_p)->offset <= offset; m_p = &(*m_p)->next)
4648 text_action *t = *m_p;
4649 /* When the action is another fill at the same address,
4650 just increase the size. */
4651 if (t->offset == offset && t->action == ta_fill)
4659 compute_removed_action_diff (const text_action *ta,
4663 int removable_space)
4666 int current_removed = 0;
4669 current_removed = ta->removed_bytes;
4671 BFD_ASSERT (ta == NULL || ta->offset == offset);
4672 BFD_ASSERT (ta == NULL || ta->action == ta_fill);
4674 /* It is not necessary to fill at the end of a section. Clean this up. */
4675 if (sec->size == offset)
4676 new_removed = removable_space - 0;
4680 int added = -removed - current_removed;
4681 /* Ignore multiples of the section alignment. */
4682 added = ((1 << sec->alignment_power) - 1) & added;
4683 new_removed = (-added);
4685 /* Modify for removable. */
4686 space = removable_space - new_removed;
4687 new_removed = (removable_space
4688 - (((1 << sec->alignment_power) - 1) & space));
4690 return (new_removed - current_removed);
4695 adjust_fill_action (text_action *ta, int fill_diff)
4697 ta->removed_bytes += fill_diff;
4701 /* Add a modification action to the text. For the case of adding or
4702 removing space, modify any current fill and assume that
4703 "unreachable_space" bytes can be freely contracted. Note that a
4704 negative removed value is a fill. */
4707 text_action_add (text_action_list *l,
4708 text_action_t action,
4716 /* It is not necessary to fill at the end of a section. */
4717 if (action == ta_fill && sec->size == offset)
4720 /* It is not necessary to fill 0 bytes. */
4721 if (action == ta_fill && removed == 0)
4724 for (m_p = &l->head; *m_p && (*m_p)->offset <= offset; m_p = &(*m_p)->next)
4726 text_action *t = *m_p;
4727 /* When the action is another fill at the same address,
4728 just increase the size. */
4729 if (t->offset == offset && t->action == ta_fill && action == ta_fill)
4731 t->removed_bytes += removed;
4736 /* Create a new record and fill it up. */
4737 ta = (text_action *) bfd_zmalloc (sizeof (text_action));
4738 ta->action = action;
4740 ta->offset = offset;
4741 ta->removed_bytes = removed;
4748 text_action_add_literal (text_action_list *l,
4749 text_action_t action,
4751 const literal_value *value,
4756 asection *sec = r_reloc_get_section (loc);
4757 bfd_vma offset = loc->target_offset;
4758 bfd_vma virtual_offset = loc->virtual_offset;
4760 BFD_ASSERT (action == ta_add_literal);
4762 for (m_p = &l->head; *m_p != NULL; m_p = &(*m_p)->next)
4764 if ((*m_p)->offset > offset
4765 && ((*m_p)->offset != offset
4766 || (*m_p)->virtual_offset > virtual_offset))
4770 /* Create a new record and fill it up. */
4771 ta = (text_action *) bfd_zmalloc (sizeof (text_action));
4772 ta->action = action;
4774 ta->offset = offset;
4775 ta->virtual_offset = virtual_offset;
4777 ta->removed_bytes = removed;
4783 /* Find the total offset adjustment for the relaxations specified by
4784 text_actions, beginning from a particular starting action. This is
4785 typically used from offset_with_removed_text to search an entire list of
4786 actions, but it may also be called directly when adjusting adjacent offsets
4787 so that each search may begin where the previous one left off. */
4790 removed_by_actions (text_action **p_start_action,
4792 bfd_boolean before_fill)
4797 r = *p_start_action;
4800 if (r->offset > offset)
4803 if (r->offset == offset
4804 && (before_fill || r->action != ta_fill || r->removed_bytes >= 0))
4807 removed += r->removed_bytes;
4812 *p_start_action = r;
4818 offset_with_removed_text (text_action_list *action_list, bfd_vma offset)
4820 text_action *r = action_list->head;
4821 return offset - removed_by_actions (&r, offset, FALSE);
4826 action_list_count (text_action_list *action_list)
4828 text_action *r = action_list->head;
4830 for (r = action_list->head; r != NULL; r = r->next)
4838 /* The find_insn_action routine will only find non-fill actions. */
4840 static text_action *
4841 find_insn_action (text_action_list *action_list, bfd_vma offset)
4844 for (t = action_list->head; t; t = t->next)
4846 if (t->offset == offset)
4853 case ta_remove_insn:
4854 case ta_remove_longcall:
4855 case ta_convert_longcall:
4856 case ta_narrow_insn:
4859 case ta_remove_literal:
4860 case ta_add_literal:
4873 print_action_list (FILE *fp, text_action_list *action_list)
4877 fprintf (fp, "Text Action\n");
4878 for (r = action_list->head; r != NULL; r = r->next)
4880 const char *t = "unknown";
4883 case ta_remove_insn:
4884 t = "remove_insn"; break;
4885 case ta_remove_longcall:
4886 t = "remove_longcall"; break;
4887 case ta_convert_longcall:
4888 t = "remove_longcall"; break;
4889 case ta_narrow_insn:
4890 t = "narrow_insn"; break;
4892 t = "widen_insn"; break;
4897 case ta_remove_literal:
4898 t = "remove_literal"; break;
4899 case ta_add_literal:
4900 t = "add_literal"; break;
4903 fprintf (fp, "%s: %s[0x%lx] \"%s\" %d\n",
4904 r->sec->owner->filename,
4905 r->sec->name, r->offset, t, r->removed_bytes);
4912 /* Lists of literals being coalesced or removed. */
4914 /* In the usual case, the literal identified by "from" is being
4915 coalesced with another literal identified by "to". If the literal is
4916 unused and is being removed altogether, "to.abfd" will be NULL.
4917 The removed_literal entries are kept on a per-section list, sorted
4918 by the "from" offset field. */
4920 typedef struct removed_literal_struct removed_literal;
4921 typedef struct removed_literal_list_struct removed_literal_list;
4923 struct removed_literal_struct
4927 removed_literal *next;
4930 struct removed_literal_list_struct
4932 removed_literal *head;
4933 removed_literal *tail;
4937 /* Record that the literal at "from" is being removed. If "to" is not
4938 NULL, the "from" literal is being coalesced with the "to" literal. */
4941 add_removed_literal (removed_literal_list *removed_list,
4942 const r_reloc *from,
4945 removed_literal *r, *new_r, *next_r;
4947 new_r = (removed_literal *) bfd_zmalloc (sizeof (removed_literal));
4949 new_r->from = *from;
4953 new_r->to.abfd = NULL;
4956 r = removed_list->head;
4959 removed_list->head = new_r;
4960 removed_list->tail = new_r;
4962 /* Special check for common case of append. */
4963 else if (removed_list->tail->from.target_offset < from->target_offset)
4965 removed_list->tail->next = new_r;
4966 removed_list->tail = new_r;
4970 while (r->from.target_offset < from->target_offset && r->next)
4976 new_r->next = next_r;
4978 removed_list->tail = new_r;
4983 /* Check if the list of removed literals contains an entry for the
4984 given address. Return the entry if found. */
4986 static removed_literal *
4987 find_removed_literal (removed_literal_list *removed_list, bfd_vma addr)
4989 removed_literal *r = removed_list->head;
4990 while (r && r->from.target_offset < addr)
4992 if (r && r->from.target_offset == addr)
5001 print_removed_literals (FILE *fp, removed_literal_list *removed_list)
5004 r = removed_list->head;
5006 fprintf (fp, "Removed Literals\n");
5007 for (; r != NULL; r = r->next)
5009 print_r_reloc (fp, &r->from);
5010 fprintf (fp, " => ");
5011 if (r->to.abfd == NULL)
5012 fprintf (fp, "REMOVED");
5014 print_r_reloc (fp, &r->to);
5022 /* Per-section data for relaxation. */
5024 typedef struct reloc_bfd_fix_struct reloc_bfd_fix;
5026 struct xtensa_relax_info_struct
5028 bfd_boolean is_relaxable_literal_section;
5029 bfd_boolean is_relaxable_asm_section;
5030 int visited; /* Number of times visited. */
5032 source_reloc *src_relocs; /* Array[src_count]. */
5034 int src_next; /* Next src_relocs entry to assign. */
5036 removed_literal_list removed_list;
5037 text_action_list action_list;
5039 reloc_bfd_fix *fix_list;
5040 reloc_bfd_fix *fix_array;
5041 unsigned fix_array_count;
5043 /* Support for expanding the reloc array that is stored
5044 in the section structure. If the relocations have been
5045 reallocated, the newly allocated relocations will be referenced
5046 here along with the actual size allocated. The relocation
5047 count will always be found in the section structure. */
5048 Elf_Internal_Rela *allocated_relocs;
5049 unsigned relocs_count;
5050 unsigned allocated_relocs_count;
5053 struct elf_xtensa_section_data
5055 struct bfd_elf_section_data elf;
5056 xtensa_relax_info relax_info;
5061 elf_xtensa_new_section_hook (bfd *abfd, asection *sec)
5063 if (!sec->used_by_bfd)
5065 struct elf_xtensa_section_data *sdata;
5066 bfd_size_type amt = sizeof (*sdata);
5068 sdata = bfd_zalloc (abfd, amt);
5071 sec->used_by_bfd = sdata;
5074 return _bfd_elf_new_section_hook (abfd, sec);
5078 static xtensa_relax_info *
5079 get_xtensa_relax_info (asection *sec)
5081 struct elf_xtensa_section_data *section_data;
5083 /* No info available if no section or if it is an output section. */
5084 if (!sec || sec == sec->output_section)
5087 section_data = (struct elf_xtensa_section_data *) elf_section_data (sec);
5088 return §ion_data->relax_info;
5093 init_xtensa_relax_info (asection *sec)
5095 xtensa_relax_info *relax_info = get_xtensa_relax_info (sec);
5097 relax_info->is_relaxable_literal_section = FALSE;
5098 relax_info->is_relaxable_asm_section = FALSE;
5099 relax_info->visited = 0;
5101 relax_info->src_relocs = NULL;
5102 relax_info->src_count = 0;
5103 relax_info->src_next = 0;
5105 relax_info->removed_list.head = NULL;
5106 relax_info->removed_list.tail = NULL;
5108 relax_info->action_list.head = NULL;
5110 relax_info->fix_list = NULL;
5111 relax_info->fix_array = NULL;
5112 relax_info->fix_array_count = 0;
5114 relax_info->allocated_relocs = NULL;
5115 relax_info->relocs_count = 0;
5116 relax_info->allocated_relocs_count = 0;
5120 /* Coalescing literals may require a relocation to refer to a section in
5121 a different input file, but the standard relocation information
5122 cannot express that. Instead, the reloc_bfd_fix structures are used
5123 to "fix" the relocations that refer to sections in other input files.
5124 These structures are kept on per-section lists. The "src_type" field
5125 records the relocation type in case there are multiple relocations on
5126 the same location. FIXME: This is ugly; an alternative might be to
5127 add new symbols with the "owner" field to some other input file. */
5129 struct reloc_bfd_fix_struct
5133 unsigned src_type; /* Relocation type. */
5135 asection *target_sec;
5136 bfd_vma target_offset;
5137 bfd_boolean translated;
5139 reloc_bfd_fix *next;
5143 static reloc_bfd_fix *
5144 reloc_bfd_fix_init (asection *src_sec,
5147 asection *target_sec,
5148 bfd_vma target_offset,
5149 bfd_boolean translated)
5153 fix = (reloc_bfd_fix *) bfd_malloc (sizeof (reloc_bfd_fix));
5154 fix->src_sec = src_sec;
5155 fix->src_offset = src_offset;
5156 fix->src_type = src_type;
5157 fix->target_sec = target_sec;
5158 fix->target_offset = target_offset;
5159 fix->translated = translated;
5166 add_fix (asection *src_sec, reloc_bfd_fix *fix)
5168 xtensa_relax_info *relax_info;
5170 relax_info = get_xtensa_relax_info (src_sec);
5171 fix->next = relax_info->fix_list;
5172 relax_info->fix_list = fix;
5177 fix_compare (const void *ap, const void *bp)
5179 const reloc_bfd_fix *a = (const reloc_bfd_fix *) ap;
5180 const reloc_bfd_fix *b = (const reloc_bfd_fix *) bp;
5182 if (a->src_offset != b->src_offset)
5183 return (a->src_offset - b->src_offset);
5184 return (a->src_type - b->src_type);
5189 cache_fix_array (asection *sec)
5191 unsigned i, count = 0;
5193 xtensa_relax_info *relax_info = get_xtensa_relax_info (sec);
5195 if (relax_info == NULL)
5197 if (relax_info->fix_list == NULL)
5200 for (r = relax_info->fix_list; r != NULL; r = r->next)
5203 relax_info->fix_array =
5204 (reloc_bfd_fix *) bfd_malloc (sizeof (reloc_bfd_fix) * count);
5205 relax_info->fix_array_count = count;
5207 r = relax_info->fix_list;
5208 for (i = 0; i < count; i++, r = r->next)
5210 relax_info->fix_array[count - 1 - i] = *r;
5211 relax_info->fix_array[count - 1 - i].next = NULL;
5214 qsort (relax_info->fix_array, relax_info->fix_array_count,
5215 sizeof (reloc_bfd_fix), fix_compare);
5219 static reloc_bfd_fix *
5220 get_bfd_fix (asection *sec, bfd_vma offset, unsigned type)
5222 xtensa_relax_info *relax_info = get_xtensa_relax_info (sec);
5226 if (relax_info == NULL)
5228 if (relax_info->fix_list == NULL)
5231 if (relax_info->fix_array == NULL)
5232 cache_fix_array (sec);
5234 key.src_offset = offset;
5235 key.src_type = type;
5236 rv = bsearch (&key, relax_info->fix_array, relax_info->fix_array_count,
5237 sizeof (reloc_bfd_fix), fix_compare);
5242 /* Section caching. */
5244 typedef struct section_cache_struct section_cache_t;
5246 struct section_cache_struct
5250 bfd_byte *contents; /* Cache of the section contents. */
5251 bfd_size_type content_length;
5253 property_table_entry *ptbl; /* Cache of the section property table. */
5256 Elf_Internal_Rela *relocs; /* Cache of the section relocations. */
5257 unsigned reloc_count;
5262 init_section_cache (section_cache_t *sec_cache)
5264 memset (sec_cache, 0, sizeof (*sec_cache));
5269 clear_section_cache (section_cache_t *sec_cache)
5273 release_contents (sec_cache->sec, sec_cache->contents);
5274 release_internal_relocs (sec_cache->sec, sec_cache->relocs);
5275 if (sec_cache->ptbl)
5276 free (sec_cache->ptbl);
5277 memset (sec_cache, 0, sizeof (sec_cache));
5283 section_cache_section (section_cache_t *sec_cache,
5285 struct bfd_link_info *link_info)
5288 property_table_entry *prop_table = NULL;
5290 bfd_byte *contents = NULL;
5291 Elf_Internal_Rela *internal_relocs = NULL;
5292 bfd_size_type sec_size;
5296 if (sec == sec_cache->sec)
5300 sec_size = bfd_get_section_limit (abfd, sec);
5302 /* Get the contents. */
5303 contents = retrieve_contents (abfd, sec, link_info->keep_memory);
5304 if (contents == NULL && sec_size != 0)
5307 /* Get the relocations. */
5308 internal_relocs = retrieve_internal_relocs (abfd, sec,
5309 link_info->keep_memory);
5311 /* Get the entry table. */
5312 ptblsize = xtensa_read_table_entries (abfd, sec, &prop_table,
5313 XTENSA_PROP_SEC_NAME, FALSE);
5317 /* Fill in the new section cache. */
5318 clear_section_cache (sec_cache);
5319 memset (sec_cache, 0, sizeof (sec_cache));
5321 sec_cache->sec = sec;
5322 sec_cache->contents = contents;
5323 sec_cache->content_length = sec_size;
5324 sec_cache->relocs = internal_relocs;
5325 sec_cache->reloc_count = sec->reloc_count;
5326 sec_cache->pte_count = ptblsize;
5327 sec_cache->ptbl = prop_table;
5332 release_contents (sec, contents);
5333 release_internal_relocs (sec, internal_relocs);
5340 /* Extended basic blocks. */
5342 /* An ebb_struct represents an Extended Basic Block. Within this
5343 range, we guarantee that all instructions are decodable, the
5344 property table entries are contiguous, and no property table
5345 specifies a segment that cannot have instructions moved. This
5346 structure contains caches of the contents, property table and
5347 relocations for the specified section for easy use. The range is
5348 specified by ranges of indices for the byte offset, property table
5349 offsets and relocation offsets. These must be consistent. */
5351 typedef struct ebb_struct ebb_t;
5357 bfd_byte *contents; /* Cache of the section contents. */
5358 bfd_size_type content_length;
5360 property_table_entry *ptbl; /* Cache of the section property table. */
5363 Elf_Internal_Rela *relocs; /* Cache of the section relocations. */
5364 unsigned reloc_count;
5366 bfd_vma start_offset; /* Offset in section. */
5367 unsigned start_ptbl_idx; /* Offset in the property table. */
5368 unsigned start_reloc_idx; /* Offset in the relocations. */
5371 unsigned end_ptbl_idx;
5372 unsigned end_reloc_idx;
5374 bfd_boolean ends_section; /* Is this the last ebb in a section? */
5376 /* The unreachable property table at the end of this set of blocks;
5377 NULL if the end is not an unreachable block. */
5378 property_table_entry *ends_unreachable;
5382 enum ebb_target_enum
5385 EBB_DESIRE_TGT_ALIGN,
5386 EBB_REQUIRE_TGT_ALIGN,
5387 EBB_REQUIRE_LOOP_ALIGN,
5392 /* proposed_action_struct is similar to the text_action_struct except
5393 that is represents a potential transformation, not one that will
5394 occur. We build a list of these for an extended basic block
5395 and use them to compute the actual actions desired. We must be
5396 careful that the entire set of actual actions we perform do not
5397 break any relocations that would fit if the actions were not
5400 typedef struct proposed_action_struct proposed_action;
5402 struct proposed_action_struct
5404 enum ebb_target_enum align_type; /* for the target alignment */
5405 bfd_vma alignment_pow;
5406 text_action_t action;
5409 bfd_boolean do_action; /* If false, then we will not perform the action. */
5413 /* The ebb_constraint_struct keeps a set of proposed actions for an
5414 extended basic block. */
5416 typedef struct ebb_constraint_struct ebb_constraint;
5418 struct ebb_constraint_struct
5421 bfd_boolean start_movable;
5423 /* Bytes of extra space at the beginning if movable. */
5424 int start_extra_space;
5426 enum ebb_target_enum start_align;
5428 bfd_boolean end_movable;
5430 /* Bytes of extra space at the end if movable. */
5431 int end_extra_space;
5433 unsigned action_count;
5434 unsigned action_allocated;
5436 /* Array of proposed actions. */
5437 proposed_action *actions;
5439 /* Action alignments -- one for each proposed action. */
5440 enum ebb_target_enum *action_aligns;
5445 init_ebb_constraint (ebb_constraint *c)
5447 memset (c, 0, sizeof (ebb_constraint));
5452 free_ebb_constraint (ebb_constraint *c)
5460 init_ebb (ebb_t *ebb,
5463 bfd_size_type content_length,
5464 property_table_entry *prop_table,
5466 Elf_Internal_Rela *internal_relocs,
5467 unsigned reloc_count)
5469 memset (ebb, 0, sizeof (ebb_t));
5471 ebb->contents = contents;
5472 ebb->content_length = content_length;
5473 ebb->ptbl = prop_table;
5474 ebb->pte_count = ptblsize;
5475 ebb->relocs = internal_relocs;
5476 ebb->reloc_count = reloc_count;
5477 ebb->start_offset = 0;
5478 ebb->end_offset = ebb->content_length - 1;
5479 ebb->start_ptbl_idx = 0;
5480 ebb->end_ptbl_idx = ptblsize;
5481 ebb->start_reloc_idx = 0;
5482 ebb->end_reloc_idx = reloc_count;
5486 /* Extend the ebb to all decodable contiguous sections. The algorithm
5487 for building a basic block around an instruction is to push it
5488 forward until we hit the end of a section, an unreachable block or
5489 a block that cannot be transformed. Then we push it backwards
5490 searching for similar conditions. */
5492 static bfd_boolean extend_ebb_bounds_forward (ebb_t *);
5493 static bfd_boolean extend_ebb_bounds_backward (ebb_t *);
5494 static bfd_size_type insn_block_decodable_len
5495 (bfd_byte *, bfd_size_type, bfd_vma, bfd_size_type);
5498 extend_ebb_bounds (ebb_t *ebb)
5500 if (!extend_ebb_bounds_forward (ebb))
5502 if (!extend_ebb_bounds_backward (ebb))
5509 extend_ebb_bounds_forward (ebb_t *ebb)
5511 property_table_entry *the_entry, *new_entry;
5513 the_entry = &ebb->ptbl[ebb->end_ptbl_idx];
5515 /* Stop when (1) we cannot decode an instruction, (2) we are at
5516 the end of the property tables, (3) we hit a non-contiguous property
5517 table entry, (4) we hit a NO_TRANSFORM region. */
5522 bfd_size_type insn_block_len;
5524 entry_end = the_entry->address - ebb->sec->vma + the_entry->size;
5526 insn_block_decodable_len (ebb->contents, ebb->content_length,
5528 entry_end - ebb->end_offset);
5529 if (insn_block_len != (entry_end - ebb->end_offset))
5531 (*_bfd_error_handler)
5532 (_("%B(%A+0x%lx): could not decode instruction; possible configuration mismatch"),
5533 ebb->sec->owner, ebb->sec, ebb->end_offset + insn_block_len);
5536 ebb->end_offset += insn_block_len;
5538 if (ebb->end_offset == ebb->sec->size)
5539 ebb->ends_section = TRUE;
5541 /* Update the reloc counter. */
5542 while (ebb->end_reloc_idx + 1 < ebb->reloc_count
5543 && (ebb->relocs[ebb->end_reloc_idx + 1].r_offset
5546 ebb->end_reloc_idx++;
5549 if (ebb->end_ptbl_idx + 1 == ebb->pte_count)
5552 new_entry = &ebb->ptbl[ebb->end_ptbl_idx + 1];
5553 if (((new_entry->flags & XTENSA_PROP_INSN) == 0)
5554 || ((new_entry->flags & XTENSA_PROP_NO_TRANSFORM) != 0)
5555 || ((the_entry->flags & XTENSA_PROP_ALIGN) != 0))
5558 if (the_entry->address + the_entry->size != new_entry->address)
5561 the_entry = new_entry;
5562 ebb->end_ptbl_idx++;
5565 /* Quick check for an unreachable or end of file just at the end. */
5566 if (ebb->end_ptbl_idx + 1 == ebb->pte_count)
5568 if (ebb->end_offset == ebb->content_length)
5569 ebb->ends_section = TRUE;
5573 new_entry = &ebb->ptbl[ebb->end_ptbl_idx + 1];
5574 if ((new_entry->flags & XTENSA_PROP_UNREACHABLE) != 0
5575 && the_entry->address + the_entry->size == new_entry->address)
5576 ebb->ends_unreachable = new_entry;
5579 /* Any other ending requires exact alignment. */
5585 extend_ebb_bounds_backward (ebb_t *ebb)
5587 property_table_entry *the_entry, *new_entry;
5589 the_entry = &ebb->ptbl[ebb->start_ptbl_idx];
5591 /* Stop when (1) we cannot decode the instructions in the current entry.
5592 (2) we are at the beginning of the property tables, (3) we hit a
5593 non-contiguous property table entry, (4) we hit a NO_TRANSFORM region. */
5597 bfd_vma block_begin;
5598 bfd_size_type insn_block_len;
5600 block_begin = the_entry->address - ebb->sec->vma;
5602 insn_block_decodable_len (ebb->contents, ebb->content_length,
5604 ebb->start_offset - block_begin);
5605 if (insn_block_len != ebb->start_offset - block_begin)
5607 (*_bfd_error_handler)
5608 (_("%B(%A+0x%lx): could not decode instruction; possible configuration mismatch"),
5609 ebb->sec->owner, ebb->sec, ebb->end_offset + insn_block_len);
5612 ebb->start_offset -= insn_block_len;
5614 /* Update the reloc counter. */
5615 while (ebb->start_reloc_idx > 0
5616 && (ebb->relocs[ebb->start_reloc_idx - 1].r_offset
5617 >= ebb->start_offset))
5619 ebb->start_reloc_idx--;
5622 if (ebb->start_ptbl_idx == 0)
5625 new_entry = &ebb->ptbl[ebb->start_ptbl_idx - 1];
5626 if ((new_entry->flags & XTENSA_PROP_INSN) == 0
5627 || ((new_entry->flags & XTENSA_PROP_NO_TRANSFORM) != 0)
5628 || ((new_entry->flags & XTENSA_PROP_ALIGN) != 0))
5630 if (new_entry->address + new_entry->size != the_entry->address)
5633 the_entry = new_entry;
5634 ebb->start_ptbl_idx--;
5640 static bfd_size_type
5641 insn_block_decodable_len (bfd_byte *contents,
5642 bfd_size_type content_len,
5643 bfd_vma block_offset,
5644 bfd_size_type block_len)
5646 bfd_vma offset = block_offset;
5648 while (offset < block_offset + block_len)
5650 bfd_size_type insn_len = 0;
5652 insn_len = insn_decode_len (contents, content_len, offset);
5654 return (offset - block_offset);
5657 return (offset - block_offset);
5662 ebb_propose_action (ebb_constraint *c,
5663 enum ebb_target_enum align_type,
5664 bfd_vma alignment_pow,
5665 text_action_t action,
5668 bfd_boolean do_action)
5670 proposed_action *act;
5672 if (c->action_allocated <= c->action_count)
5674 unsigned new_allocated, i;
5675 proposed_action *new_actions;
5677 new_allocated = (c->action_count + 2) * 2;
5678 new_actions = (proposed_action *)
5679 bfd_zmalloc (sizeof (proposed_action) * new_allocated);
5681 for (i = 0; i < c->action_count; i++)
5682 new_actions[i] = c->actions[i];
5685 c->actions = new_actions;
5686 c->action_allocated = new_allocated;
5689 act = &c->actions[c->action_count];
5690 act->align_type = align_type;
5691 act->alignment_pow = alignment_pow;
5692 act->action = action;
5693 act->offset = offset;
5694 act->removed_bytes = removed_bytes;
5695 act->do_action = do_action;
5701 /* Access to internal relocations, section contents and symbols. */
5703 /* During relaxation, we need to modify relocations, section contents,
5704 and symbol definitions, and we need to keep the original values from
5705 being reloaded from the input files, i.e., we need to "pin" the
5706 modified values in memory. We also want to continue to observe the
5707 setting of the "keep-memory" flag. The following functions wrap the
5708 standard BFD functions to take care of this for us. */
5710 static Elf_Internal_Rela *
5711 retrieve_internal_relocs (bfd *abfd, asection *sec, bfd_boolean keep_memory)
5713 Elf_Internal_Rela *internal_relocs;
5715 if ((sec->flags & SEC_LINKER_CREATED) != 0)
5718 internal_relocs = elf_section_data (sec)->relocs;
5719 if (internal_relocs == NULL)
5720 internal_relocs = (_bfd_elf_link_read_relocs
5721 (abfd, sec, NULL, NULL, keep_memory));
5722 return internal_relocs;
5727 pin_internal_relocs (asection *sec, Elf_Internal_Rela *internal_relocs)
5729 elf_section_data (sec)->relocs = internal_relocs;
5734 release_internal_relocs (asection *sec, Elf_Internal_Rela *internal_relocs)
5737 && elf_section_data (sec)->relocs != internal_relocs)
5738 free (internal_relocs);
5743 retrieve_contents (bfd *abfd, asection *sec, bfd_boolean keep_memory)
5746 bfd_size_type sec_size;
5748 sec_size = bfd_get_section_limit (abfd, sec);
5749 contents = elf_section_data (sec)->this_hdr.contents;
5751 if (contents == NULL && sec_size != 0)
5753 if (!bfd_malloc_and_get_section (abfd, sec, &contents))
5760 elf_section_data (sec)->this_hdr.contents = contents;
5767 pin_contents (asection *sec, bfd_byte *contents)
5769 elf_section_data (sec)->this_hdr.contents = contents;
5774 release_contents (asection *sec, bfd_byte *contents)
5776 if (contents && elf_section_data (sec)->this_hdr.contents != contents)
5781 static Elf_Internal_Sym *
5782 retrieve_local_syms (bfd *input_bfd)
5784 Elf_Internal_Shdr *symtab_hdr;
5785 Elf_Internal_Sym *isymbuf;
5788 symtab_hdr = &elf_tdata (input_bfd)->symtab_hdr;
5789 locsymcount = symtab_hdr->sh_info;
5791 isymbuf = (Elf_Internal_Sym *) symtab_hdr->contents;
5792 if (isymbuf == NULL && locsymcount != 0)
5793 isymbuf = bfd_elf_get_elf_syms (input_bfd, symtab_hdr, locsymcount, 0,
5796 /* Save the symbols for this input file so they won't be read again. */
5797 if (isymbuf && isymbuf != (Elf_Internal_Sym *) symtab_hdr->contents)
5798 symtab_hdr->contents = (unsigned char *) isymbuf;
5804 /* Code for link-time relaxation. */
5806 /* Initialization for relaxation: */
5807 static bfd_boolean analyze_relocations (struct bfd_link_info *);
5808 static bfd_boolean find_relaxable_sections
5809 (bfd *, asection *, struct bfd_link_info *, bfd_boolean *);
5810 static bfd_boolean collect_source_relocs
5811 (bfd *, asection *, struct bfd_link_info *);
5812 static bfd_boolean is_resolvable_asm_expansion
5813 (bfd *, asection *, bfd_byte *, Elf_Internal_Rela *, struct bfd_link_info *,
5815 static Elf_Internal_Rela *find_associated_l32r_irel
5816 (bfd *, asection *, bfd_byte *, Elf_Internal_Rela *, Elf_Internal_Rela *);
5817 static bfd_boolean compute_text_actions
5818 (bfd *, asection *, struct bfd_link_info *);
5819 static bfd_boolean compute_ebb_proposed_actions (ebb_constraint *);
5820 static bfd_boolean compute_ebb_actions (ebb_constraint *);
5821 static bfd_boolean check_section_ebb_pcrels_fit
5822 (bfd *, asection *, bfd_byte *, Elf_Internal_Rela *, const ebb_constraint *,
5823 const xtensa_opcode *);
5824 static bfd_boolean check_section_ebb_reduces (const ebb_constraint *);
5825 static void text_action_add_proposed
5826 (text_action_list *, const ebb_constraint *, asection *);
5827 static int compute_fill_extra_space (property_table_entry *);
5830 static bfd_boolean compute_removed_literals
5831 (bfd *, asection *, struct bfd_link_info *, value_map_hash_table *);
5832 static Elf_Internal_Rela *get_irel_at_offset
5833 (asection *, Elf_Internal_Rela *, bfd_vma);
5834 static bfd_boolean is_removable_literal
5835 (const source_reloc *, int, const source_reloc *, int, asection *,
5836 property_table_entry *, int);
5837 static bfd_boolean remove_dead_literal
5838 (bfd *, asection *, struct bfd_link_info *, Elf_Internal_Rela *,
5839 Elf_Internal_Rela *, source_reloc *, property_table_entry *, int);
5840 static bfd_boolean identify_literal_placement
5841 (bfd *, asection *, bfd_byte *, struct bfd_link_info *,
5842 value_map_hash_table *, bfd_boolean *, Elf_Internal_Rela *, int,
5843 source_reloc *, property_table_entry *, int, section_cache_t *,
5845 static bfd_boolean relocations_reach (source_reloc *, int, const r_reloc *);
5846 static bfd_boolean coalesce_shared_literal
5847 (asection *, source_reloc *, property_table_entry *, int, value_map *);
5848 static bfd_boolean move_shared_literal
5849 (asection *, struct bfd_link_info *, source_reloc *, property_table_entry *,
5850 int, const r_reloc *, const literal_value *, section_cache_t *);
5853 static bfd_boolean relax_section (bfd *, asection *, struct bfd_link_info *);
5854 static bfd_boolean translate_section_fixes (asection *);
5855 static bfd_boolean translate_reloc_bfd_fix (reloc_bfd_fix *);
5856 static void translate_reloc (const r_reloc *, r_reloc *);
5857 static void shrink_dynamic_reloc_sections
5858 (struct bfd_link_info *, bfd *, asection *, Elf_Internal_Rela *);
5859 static bfd_boolean move_literal
5860 (bfd *, struct bfd_link_info *, asection *, bfd_vma, bfd_byte *,
5861 xtensa_relax_info *, Elf_Internal_Rela **, const literal_value *);
5862 static bfd_boolean relax_property_section
5863 (bfd *, asection *, struct bfd_link_info *);
5866 static bfd_boolean relax_section_symbols (bfd *, asection *);
5870 elf_xtensa_relax_section (bfd *abfd,
5872 struct bfd_link_info *link_info,
5875 static value_map_hash_table *values = NULL;
5876 static bfd_boolean relocations_analyzed = FALSE;
5877 xtensa_relax_info *relax_info;
5879 if (!relocations_analyzed)
5881 /* Do some overall initialization for relaxation. */
5882 values = value_map_hash_table_init ();
5885 relaxing_section = TRUE;
5886 if (!analyze_relocations (link_info))
5888 relocations_analyzed = TRUE;
5892 /* Don't mess with linker-created sections. */
5893 if ((sec->flags & SEC_LINKER_CREATED) != 0)
5896 relax_info = get_xtensa_relax_info (sec);
5897 BFD_ASSERT (relax_info != NULL);
5899 switch (relax_info->visited)
5902 /* Note: It would be nice to fold this pass into
5903 analyze_relocations, but it is important for this step that the
5904 sections be examined in link order. */
5905 if (!compute_removed_literals (abfd, sec, link_info, values))
5912 value_map_hash_table_delete (values);
5914 if (!relax_section (abfd, sec, link_info))
5920 if (!relax_section_symbols (abfd, sec))
5925 relax_info->visited++;
5930 /* Initialization for relaxation. */
5932 /* This function is called once at the start of relaxation. It scans
5933 all the input sections and marks the ones that are relaxable (i.e.,
5934 literal sections with L32R relocations against them), and then
5935 collects source_reloc information for all the relocations against
5936 those relaxable sections. During this process, it also detects
5937 longcalls, i.e., calls relaxed by the assembler into indirect
5938 calls, that can be optimized back into direct calls. Within each
5939 extended basic block (ebb) containing an optimized longcall, it
5940 computes a set of "text actions" that can be performed to remove
5941 the L32R associated with the longcall while optionally preserving
5942 branch target alignments. */
5945 analyze_relocations (struct bfd_link_info *link_info)
5949 bfd_boolean is_relaxable = FALSE;
5951 /* Initialize the per-section relaxation info. */
5952 for (abfd = link_info->input_bfds; abfd != NULL; abfd = abfd->link_next)
5953 for (sec = abfd->sections; sec != NULL; sec = sec->next)
5955 init_xtensa_relax_info (sec);
5958 /* Mark relaxable sections (and count relocations against each one). */
5959 for (abfd = link_info->input_bfds; abfd != NULL; abfd = abfd->link_next)
5960 for (sec = abfd->sections; sec != NULL; sec = sec->next)
5962 if (!find_relaxable_sections (abfd, sec, link_info, &is_relaxable))
5966 /* Bail out if there are no relaxable sections. */
5970 /* Allocate space for source_relocs. */
5971 for (abfd = link_info->input_bfds; abfd != NULL; abfd = abfd->link_next)
5972 for (sec = abfd->sections; sec != NULL; sec = sec->next)
5974 xtensa_relax_info *relax_info;
5976 relax_info = get_xtensa_relax_info (sec);
5977 if (relax_info->is_relaxable_literal_section
5978 || relax_info->is_relaxable_asm_section)
5980 relax_info->src_relocs = (source_reloc *)
5981 bfd_malloc (relax_info->src_count * sizeof (source_reloc));
5984 relax_info->src_count = 0;
5987 /* Collect info on relocations against each relaxable section. */
5988 for (abfd = link_info->input_bfds; abfd != NULL; abfd = abfd->link_next)
5989 for (sec = abfd->sections; sec != NULL; sec = sec->next)
5991 if (!collect_source_relocs (abfd, sec, link_info))
5995 /* Compute the text actions. */
5996 for (abfd = link_info->input_bfds; abfd != NULL; abfd = abfd->link_next)
5997 for (sec = abfd->sections; sec != NULL; sec = sec->next)
5999 if (!compute_text_actions (abfd, sec, link_info))
6007 /* Find all the sections that might be relaxed. The motivation for
6008 this pass is that collect_source_relocs() needs to record _all_ the
6009 relocations that target each relaxable section. That is expensive
6010 and unnecessary unless the target section is actually going to be
6011 relaxed. This pass identifies all such sections by checking if
6012 they have L32Rs pointing to them. In the process, the total number
6013 of relocations targeting each section is also counted so that we
6014 know how much space to allocate for source_relocs against each
6015 relaxable literal section. */
6018 find_relaxable_sections (bfd *abfd,
6020 struct bfd_link_info *link_info,
6021 bfd_boolean *is_relaxable_p)
6023 Elf_Internal_Rela *internal_relocs;
6025 bfd_boolean ok = TRUE;
6027 xtensa_relax_info *source_relax_info;
6028 bfd_boolean is_l32r_reloc;
6030 internal_relocs = retrieve_internal_relocs (abfd, sec,
6031 link_info->keep_memory);
6032 if (internal_relocs == NULL)
6035 contents = retrieve_contents (abfd, sec, link_info->keep_memory);
6036 if (contents == NULL && sec->size != 0)
6042 source_relax_info = get_xtensa_relax_info (sec);
6043 for (i = 0; i < sec->reloc_count; i++)
6045 Elf_Internal_Rela *irel = &internal_relocs[i];
6047 asection *target_sec;
6048 xtensa_relax_info *target_relax_info;
6050 /* If this section has not already been marked as "relaxable", and
6051 if it contains any ASM_EXPAND relocations (marking expanded
6052 longcalls) that can be optimized into direct calls, then mark
6053 the section as "relaxable". */
6054 if (source_relax_info
6055 && !source_relax_info->is_relaxable_asm_section
6056 && ELF32_R_TYPE (irel->r_info) == R_XTENSA_ASM_EXPAND)
6058 bfd_boolean is_reachable = FALSE;
6059 if (is_resolvable_asm_expansion (abfd, sec, contents, irel,
6060 link_info, &is_reachable)
6063 source_relax_info->is_relaxable_asm_section = TRUE;
6064 *is_relaxable_p = TRUE;
6068 r_reloc_init (&r_rel, abfd, irel, contents,
6069 bfd_get_section_limit (abfd, sec));
6071 target_sec = r_reloc_get_section (&r_rel);
6072 target_relax_info = get_xtensa_relax_info (target_sec);
6073 if (!target_relax_info)
6076 /* Count PC-relative operand relocations against the target section.
6077 Note: The conditions tested here must match the conditions under
6078 which init_source_reloc is called in collect_source_relocs(). */
6079 is_l32r_reloc = FALSE;
6080 if (is_operand_relocation (ELF32_R_TYPE (irel->r_info)))
6082 xtensa_opcode opcode =
6083 get_relocation_opcode (abfd, sec, contents, irel);
6084 if (opcode != XTENSA_UNDEFINED)
6086 is_l32r_reloc = (opcode == get_l32r_opcode ());
6087 if (!is_alt_relocation (ELF32_R_TYPE (irel->r_info))
6089 target_relax_info->src_count++;
6093 if (is_l32r_reloc && r_reloc_is_defined (&r_rel))
6095 /* Mark the target section as relaxable. */
6096 target_relax_info->is_relaxable_literal_section = TRUE;
6097 *is_relaxable_p = TRUE;
6102 release_contents (sec, contents);
6103 release_internal_relocs (sec, internal_relocs);
6108 /* Record _all_ the relocations that point to relaxable sections, and
6109 get rid of ASM_EXPAND relocs by either converting them to
6110 ASM_SIMPLIFY or by removing them. */
6113 collect_source_relocs (bfd *abfd,
6115 struct bfd_link_info *link_info)
6117 Elf_Internal_Rela *internal_relocs;
6119 bfd_boolean ok = TRUE;
6121 bfd_size_type sec_size;
6123 internal_relocs = retrieve_internal_relocs (abfd, sec,
6124 link_info->keep_memory);
6125 if (internal_relocs == NULL)
6128 sec_size = bfd_get_section_limit (abfd, sec);
6129 contents = retrieve_contents (abfd, sec, link_info->keep_memory);
6130 if (contents == NULL && sec_size != 0)
6136 /* Record relocations against relaxable literal sections. */
6137 for (i = 0; i < sec->reloc_count; i++)
6139 Elf_Internal_Rela *irel = &internal_relocs[i];
6141 asection *target_sec;
6142 xtensa_relax_info *target_relax_info;
6144 r_reloc_init (&r_rel, abfd, irel, contents, sec_size);
6146 target_sec = r_reloc_get_section (&r_rel);
6147 target_relax_info = get_xtensa_relax_info (target_sec);
6149 if (target_relax_info
6150 && (target_relax_info->is_relaxable_literal_section
6151 || target_relax_info->is_relaxable_asm_section))
6153 xtensa_opcode opcode = XTENSA_UNDEFINED;
6155 bfd_boolean is_abs_literal = FALSE;
6157 if (is_alt_relocation (ELF32_R_TYPE (irel->r_info)))
6159 /* None of the current alternate relocs are PC-relative,
6160 and only PC-relative relocs matter here. However, we
6161 still need to record the opcode for literal
6163 opcode = get_relocation_opcode (abfd, sec, contents, irel);
6164 if (opcode == get_l32r_opcode ())
6166 is_abs_literal = TRUE;
6170 opcode = XTENSA_UNDEFINED;
6172 else if (is_operand_relocation (ELF32_R_TYPE (irel->r_info)))
6174 opcode = get_relocation_opcode (abfd, sec, contents, irel);
6175 opnd = get_relocation_opnd (opcode, ELF32_R_TYPE (irel->r_info));
6178 if (opcode != XTENSA_UNDEFINED)
6180 int src_next = target_relax_info->src_next++;
6181 source_reloc *s_reloc = &target_relax_info->src_relocs[src_next];
6183 init_source_reloc (s_reloc, sec, &r_rel, opcode, opnd,
6189 /* Now get rid of ASM_EXPAND relocations. At this point, the
6190 src_relocs array for the target literal section may still be
6191 incomplete, but it must at least contain the entries for the L32R
6192 relocations associated with ASM_EXPANDs because they were just
6193 added in the preceding loop over the relocations. */
6195 for (i = 0; i < sec->reloc_count; i++)
6197 Elf_Internal_Rela *irel = &internal_relocs[i];
6198 bfd_boolean is_reachable;
6200 if (!is_resolvable_asm_expansion (abfd, sec, contents, irel, link_info,
6206 Elf_Internal_Rela *l32r_irel;
6208 asection *target_sec;
6209 xtensa_relax_info *target_relax_info;
6211 /* Mark the source_reloc for the L32R so that it will be
6212 removed in compute_removed_literals(), along with the
6213 associated literal. */
6214 l32r_irel = find_associated_l32r_irel (abfd, sec, contents,
6215 irel, internal_relocs);
6216 if (l32r_irel == NULL)
6219 r_reloc_init (&r_rel, abfd, l32r_irel, contents, sec_size);
6221 target_sec = r_reloc_get_section (&r_rel);
6222 target_relax_info = get_xtensa_relax_info (target_sec);
6224 if (target_relax_info
6225 && (target_relax_info->is_relaxable_literal_section
6226 || target_relax_info->is_relaxable_asm_section))
6228 source_reloc *s_reloc;
6230 /* Search the source_relocs for the entry corresponding to
6231 the l32r_irel. Note: The src_relocs array is not yet
6232 sorted, but it wouldn't matter anyway because we're
6233 searching by source offset instead of target offset. */
6234 s_reloc = find_source_reloc (target_relax_info->src_relocs,
6235 target_relax_info->src_next,
6237 BFD_ASSERT (s_reloc);
6238 s_reloc->is_null = TRUE;
6241 /* Convert this reloc to ASM_SIMPLIFY. */
6242 irel->r_info = ELF32_R_INFO (ELF32_R_SYM (irel->r_info),
6243 R_XTENSA_ASM_SIMPLIFY);
6244 l32r_irel->r_info = ELF32_R_INFO (0, R_XTENSA_NONE);
6246 pin_internal_relocs (sec, internal_relocs);
6250 /* It is resolvable but doesn't reach. We resolve now
6251 by eliminating the relocation -- the call will remain
6252 expanded into L32R/CALLX. */
6253 irel->r_info = ELF32_R_INFO (0, R_XTENSA_NONE);
6254 pin_internal_relocs (sec, internal_relocs);
6259 release_contents (sec, contents);
6260 release_internal_relocs (sec, internal_relocs);
6265 /* Return TRUE if the asm expansion can be resolved. Generally it can
6266 be resolved on a final link or when a partial link locates it in the
6267 same section as the target. Set "is_reachable" flag if the target of
6268 the call is within the range of a direct call, given the current VMA
6269 for this section and the target section. */
6272 is_resolvable_asm_expansion (bfd *abfd,
6275 Elf_Internal_Rela *irel,
6276 struct bfd_link_info *link_info,
6277 bfd_boolean *is_reachable_p)
6279 asection *target_sec;
6280 bfd_vma target_offset;
6282 xtensa_opcode opcode, direct_call_opcode;
6283 bfd_vma self_address;
6284 bfd_vma dest_address;
6285 bfd_boolean uses_l32r;
6286 bfd_size_type sec_size;
6288 *is_reachable_p = FALSE;
6290 if (contents == NULL)
6293 if (ELF32_R_TYPE (irel->r_info) != R_XTENSA_ASM_EXPAND)
6296 sec_size = bfd_get_section_limit (abfd, sec);
6297 opcode = get_expanded_call_opcode (contents + irel->r_offset,
6298 sec_size - irel->r_offset, &uses_l32r);
6299 /* Optimization of longcalls that use CONST16 is not yet implemented. */
6303 direct_call_opcode = swap_callx_for_call_opcode (opcode);
6304 if (direct_call_opcode == XTENSA_UNDEFINED)
6307 /* Check and see that the target resolves. */
6308 r_reloc_init (&r_rel, abfd, irel, contents, sec_size);
6309 if (!r_reloc_is_defined (&r_rel))
6312 target_sec = r_reloc_get_section (&r_rel);
6313 target_offset = r_rel.target_offset;
6315 /* If the target is in a shared library, then it doesn't reach. This
6316 isn't supposed to come up because the compiler should never generate
6317 non-PIC calls on systems that use shared libraries, but the linker
6318 shouldn't crash regardless. */
6319 if (!target_sec->output_section)
6322 /* For relocatable sections, we can only simplify when the output
6323 section of the target is the same as the output section of the
6325 if (link_info->relocatable
6326 && (target_sec->output_section != sec->output_section
6327 || is_reloc_sym_weak (abfd, irel)))
6330 self_address = (sec->output_section->vma
6331 + sec->output_offset + irel->r_offset + 3);
6332 dest_address = (target_sec->output_section->vma
6333 + target_sec->output_offset + target_offset);
6335 *is_reachable_p = pcrel_reloc_fits (direct_call_opcode, 0,
6336 self_address, dest_address);
6338 if ((self_address >> CALL_SEGMENT_BITS) !=
6339 (dest_address >> CALL_SEGMENT_BITS))
6346 static Elf_Internal_Rela *
6347 find_associated_l32r_irel (bfd *abfd,
6350 Elf_Internal_Rela *other_irel,
6351 Elf_Internal_Rela *internal_relocs)
6355 for (i = 0; i < sec->reloc_count; i++)
6357 Elf_Internal_Rela *irel = &internal_relocs[i];
6359 if (irel == other_irel)
6361 if (irel->r_offset != other_irel->r_offset)
6363 if (is_l32r_relocation (abfd, sec, contents, irel))
6371 static xtensa_opcode *
6372 build_reloc_opcodes (bfd *abfd,
6375 Elf_Internal_Rela *internal_relocs)
6378 xtensa_opcode *reloc_opcodes =
6379 (xtensa_opcode *) bfd_malloc (sizeof (xtensa_opcode) * sec->reloc_count);
6380 for (i = 0; i < sec->reloc_count; i++)
6382 Elf_Internal_Rela *irel = &internal_relocs[i];
6383 reloc_opcodes[i] = get_relocation_opcode (abfd, sec, contents, irel);
6385 return reloc_opcodes;
6389 /* The compute_text_actions function will build a list of potential
6390 transformation actions for code in the extended basic block of each
6391 longcall that is optimized to a direct call. From this list we
6392 generate a set of actions to actually perform that optimizes for
6393 space and, if not using size_opt, maintains branch target
6396 These actions to be performed are placed on a per-section list.
6397 The actual changes are performed by relax_section() in the second
6401 compute_text_actions (bfd *abfd,
6403 struct bfd_link_info *link_info)
6405 xtensa_opcode *reloc_opcodes = NULL;
6406 xtensa_relax_info *relax_info;
6408 Elf_Internal_Rela *internal_relocs;
6409 bfd_boolean ok = TRUE;
6411 property_table_entry *prop_table = 0;
6413 bfd_size_type sec_size;
6415 relax_info = get_xtensa_relax_info (sec);
6416 BFD_ASSERT (relax_info);
6417 BFD_ASSERT (relax_info->src_next == relax_info->src_count);
6419 /* Do nothing if the section contains no optimized longcalls. */
6420 if (!relax_info->is_relaxable_asm_section)
6423 internal_relocs = retrieve_internal_relocs (abfd, sec,
6424 link_info->keep_memory);
6426 if (internal_relocs)
6427 qsort (internal_relocs, sec->reloc_count, sizeof (Elf_Internal_Rela),
6428 internal_reloc_compare);
6430 sec_size = bfd_get_section_limit (abfd, sec);
6431 contents = retrieve_contents (abfd, sec, link_info->keep_memory);
6432 if (contents == NULL && sec_size != 0)
6438 ptblsize = xtensa_read_table_entries (abfd, sec, &prop_table,
6439 XTENSA_PROP_SEC_NAME, FALSE);
6446 for (i = 0; i < sec->reloc_count; i++)
6448 Elf_Internal_Rela *irel = &internal_relocs[i];
6450 property_table_entry *the_entry;
6453 ebb_constraint ebb_table;
6454 bfd_size_type simplify_size;
6456 if (irel && ELF32_R_TYPE (irel->r_info) != R_XTENSA_ASM_SIMPLIFY)
6458 r_offset = irel->r_offset;
6460 simplify_size = get_asm_simplify_size (contents, sec_size, r_offset);
6461 if (simplify_size == 0)
6463 (*_bfd_error_handler)
6464 (_("%B(%A+0x%lx): could not decode instruction for XTENSA_ASM_SIMPLIFY relocation; possible configuration mismatch"),
6465 sec->owner, sec, r_offset);
6469 /* If the instruction table is not around, then don't do this
6471 the_entry = elf_xtensa_find_property_entry (prop_table, ptblsize,
6472 sec->vma + irel->r_offset);
6473 if (the_entry == NULL || XTENSA_NO_NOP_REMOVAL)
6475 text_action_add (&relax_info->action_list,
6476 ta_convert_longcall, sec, r_offset,
6481 /* If the next longcall happens to be at the same address as an
6482 unreachable section of size 0, then skip forward. */
6483 ptbl_idx = the_entry - prop_table;
6484 while ((the_entry->flags & XTENSA_PROP_UNREACHABLE)
6485 && the_entry->size == 0
6486 && ptbl_idx + 1 < ptblsize
6487 && (prop_table[ptbl_idx + 1].address
6488 == prop_table[ptbl_idx].address))
6494 if (the_entry->flags & XTENSA_PROP_NO_TRANSFORM)
6495 /* NO_REORDER is OK */
6498 init_ebb_constraint (&ebb_table);
6499 ebb = &ebb_table.ebb;
6500 init_ebb (ebb, sec, contents, sec_size, prop_table, ptblsize,
6501 internal_relocs, sec->reloc_count);
6502 ebb->start_offset = r_offset + simplify_size;
6503 ebb->end_offset = r_offset + simplify_size;
6504 ebb->start_ptbl_idx = ptbl_idx;
6505 ebb->end_ptbl_idx = ptbl_idx;
6506 ebb->start_reloc_idx = i;
6507 ebb->end_reloc_idx = i;
6509 /* Precompute the opcode for each relocation. */
6510 if (reloc_opcodes == NULL)
6511 reloc_opcodes = build_reloc_opcodes (abfd, sec, contents,
6514 if (!extend_ebb_bounds (ebb)
6515 || !compute_ebb_proposed_actions (&ebb_table)
6516 || !compute_ebb_actions (&ebb_table)
6517 || !check_section_ebb_pcrels_fit (abfd, sec, contents,
6518 internal_relocs, &ebb_table,
6520 || !check_section_ebb_reduces (&ebb_table))
6522 /* If anything goes wrong or we get unlucky and something does
6523 not fit, with our plan because of expansion between
6524 critical branches, just convert to a NOP. */
6526 text_action_add (&relax_info->action_list,
6527 ta_convert_longcall, sec, r_offset, 0);
6528 i = ebb_table.ebb.end_reloc_idx;
6529 free_ebb_constraint (&ebb_table);
6533 text_action_add_proposed (&relax_info->action_list, &ebb_table, sec);
6535 /* Update the index so we do not go looking at the relocations
6536 we have already processed. */
6537 i = ebb_table.ebb.end_reloc_idx;
6538 free_ebb_constraint (&ebb_table);
6542 if (relax_info->action_list.head)
6543 print_action_list (stderr, &relax_info->action_list);
6547 release_contents (sec, contents);
6548 release_internal_relocs (sec, internal_relocs);
6552 free (reloc_opcodes);
6558 /* Do not widen an instruction if it is preceeded by a
6559 loop opcode. It might cause misalignment. */
6562 prev_instr_is_a_loop (bfd_byte *contents,
6563 bfd_size_type content_length,
6564 bfd_size_type offset)
6566 xtensa_opcode prev_opcode;
6570 prev_opcode = insn_decode_opcode (contents, content_length, offset-3, 0);
6571 return (xtensa_opcode_is_loop (xtensa_default_isa, prev_opcode) == 1);
6575 /* Find all of the possible actions for an extended basic block. */
6578 compute_ebb_proposed_actions (ebb_constraint *ebb_table)
6580 const ebb_t *ebb = &ebb_table->ebb;
6581 unsigned rel_idx = ebb->start_reloc_idx;
6582 property_table_entry *entry, *start_entry, *end_entry;
6584 xtensa_isa isa = xtensa_default_isa;
6586 static xtensa_insnbuf insnbuf = NULL;
6587 static xtensa_insnbuf slotbuf = NULL;
6589 if (insnbuf == NULL)
6591 insnbuf = xtensa_insnbuf_alloc (isa);
6592 slotbuf = xtensa_insnbuf_alloc (isa);
6595 start_entry = &ebb->ptbl[ebb->start_ptbl_idx];
6596 end_entry = &ebb->ptbl[ebb->end_ptbl_idx];
6598 for (entry = start_entry; entry <= end_entry; entry++)
6600 bfd_vma start_offset, end_offset;
6601 bfd_size_type insn_len;
6603 start_offset = entry->address - ebb->sec->vma;
6604 end_offset = entry->address + entry->size - ebb->sec->vma;
6606 if (entry == start_entry)
6607 start_offset = ebb->start_offset;
6608 if (entry == end_entry)
6609 end_offset = ebb->end_offset;
6610 offset = start_offset;
6612 if (offset == entry->address - ebb->sec->vma
6613 && (entry->flags & XTENSA_PROP_INSN_BRANCH_TARGET) != 0)
6615 enum ebb_target_enum align_type = EBB_DESIRE_TGT_ALIGN;
6616 BFD_ASSERT (offset != end_offset);
6617 if (offset == end_offset)
6620 insn_len = insn_decode_len (ebb->contents, ebb->content_length,
6625 if (check_branch_target_aligned_address (offset, insn_len))
6626 align_type = EBB_REQUIRE_TGT_ALIGN;
6628 ebb_propose_action (ebb_table, align_type, 0,
6629 ta_none, offset, 0, TRUE);
6632 while (offset != end_offset)
6634 Elf_Internal_Rela *irel;
6635 xtensa_opcode opcode;
6637 while (rel_idx < ebb->end_reloc_idx
6638 && (ebb->relocs[rel_idx].r_offset < offset
6639 || (ebb->relocs[rel_idx].r_offset == offset
6640 && (ELF32_R_TYPE (ebb->relocs[rel_idx].r_info)
6641 != R_XTENSA_ASM_SIMPLIFY))))
6644 /* Check for longcall. */
6645 irel = &ebb->relocs[rel_idx];
6646 if (irel->r_offset == offset
6647 && ELF32_R_TYPE (irel->r_info) == R_XTENSA_ASM_SIMPLIFY)
6649 bfd_size_type simplify_size;
6651 simplify_size = get_asm_simplify_size (ebb->contents,
6652 ebb->content_length,
6654 if (simplify_size == 0)
6657 ebb_propose_action (ebb_table, EBB_NO_ALIGN, 0,
6658 ta_convert_longcall, offset, 0, TRUE);
6660 offset += simplify_size;
6664 if (offset + MIN_INSN_LENGTH > ebb->content_length)
6666 xtensa_insnbuf_from_chars (isa, insnbuf, &ebb->contents[offset],
6667 ebb->content_length - offset);
6668 fmt = xtensa_format_decode (isa, insnbuf);
6669 if (fmt == XTENSA_UNDEFINED)
6671 insn_len = xtensa_format_length (isa, fmt);
6672 if (insn_len == (bfd_size_type) XTENSA_UNDEFINED)
6675 if (xtensa_format_num_slots (isa, fmt) != 1)
6681 xtensa_format_get_slot (isa, fmt, 0, insnbuf, slotbuf);
6682 opcode = xtensa_opcode_decode (isa, fmt, 0, slotbuf);
6683 if (opcode == XTENSA_UNDEFINED)
6686 if ((entry->flags & XTENSA_PROP_INSN_NO_DENSITY) == 0
6687 && (entry->flags & XTENSA_PROP_NO_TRANSFORM) == 0
6688 && can_narrow_instruction (slotbuf, fmt, opcode) != 0)
6690 /* Add an instruction narrow action. */
6691 ebb_propose_action (ebb_table, EBB_NO_ALIGN, 0,
6692 ta_narrow_insn, offset, 0, FALSE);
6694 else if ((entry->flags & XTENSA_PROP_NO_TRANSFORM) == 0
6695 && can_widen_instruction (slotbuf, fmt, opcode) != 0
6696 && ! prev_instr_is_a_loop (ebb->contents,
6697 ebb->content_length, offset))
6699 /* Add an instruction widen action. */
6700 ebb_propose_action (ebb_table, EBB_NO_ALIGN, 0,
6701 ta_widen_insn, offset, 0, FALSE);
6703 else if (xtensa_opcode_is_loop (xtensa_default_isa, opcode) == 1)
6705 /* Check for branch targets. */
6706 ebb_propose_action (ebb_table, EBB_REQUIRE_LOOP_ALIGN, 0,
6707 ta_none, offset, 0, TRUE);
6714 if (ebb->ends_unreachable)
6716 ebb_propose_action (ebb_table, EBB_NO_ALIGN, 0,
6717 ta_fill, ebb->end_offset, 0, TRUE);
6723 (*_bfd_error_handler)
6724 (_("%B(%A+0x%lx): could not decode instruction; possible configuration mismatch"),
6725 ebb->sec->owner, ebb->sec, offset);
6730 /* After all of the information has collected about the
6731 transformations possible in an EBB, compute the appropriate actions
6732 here in compute_ebb_actions. We still must check later to make
6733 sure that the actions do not break any relocations. The algorithm
6734 used here is pretty greedy. Basically, it removes as many no-ops
6735 as possible so that the end of the EBB has the same alignment
6736 characteristics as the original. First, it uses narrowing, then
6737 fill space at the end of the EBB, and finally widenings. If that
6738 does not work, it tries again with one fewer no-op removed. The
6739 optimization will only be performed if all of the branch targets
6740 that were aligned before transformation are also aligned after the
6743 When the size_opt flag is set, ignore the branch target alignments,
6744 narrow all wide instructions, and remove all no-ops unless the end
6745 of the EBB prevents it. */
6748 compute_ebb_actions (ebb_constraint *ebb_table)
6752 int removed_bytes = 0;
6753 ebb_t *ebb = &ebb_table->ebb;
6754 unsigned seg_idx_start = 0;
6755 unsigned seg_idx_end = 0;
6757 /* We perform this like the assembler relaxation algorithm: Start by
6758 assuming all instructions are narrow and all no-ops removed; then
6761 /* For each segment of this that has a solid constraint, check to
6762 see if there are any combinations that will keep the constraint.
6764 for (seg_idx_end = 0; seg_idx_end < ebb_table->action_count; seg_idx_end++)
6766 bfd_boolean requires_text_end_align = FALSE;
6767 unsigned longcall_count = 0;
6768 unsigned longcall_convert_count = 0;
6769 unsigned narrowable_count = 0;
6770 unsigned narrowable_convert_count = 0;
6771 unsigned widenable_count = 0;
6772 unsigned widenable_convert_count = 0;
6774 proposed_action *action = NULL;
6775 int align = (1 << ebb_table->ebb.sec->alignment_power);
6777 seg_idx_start = seg_idx_end;
6779 for (i = seg_idx_start; i < ebb_table->action_count; i++)
6781 action = &ebb_table->actions[i];
6782 if (action->action == ta_convert_longcall)
6784 if (action->action == ta_narrow_insn)
6786 if (action->action == ta_widen_insn)
6788 if (action->action == ta_fill)
6790 if (action->align_type == EBB_REQUIRE_LOOP_ALIGN)
6792 if (action->align_type == EBB_REQUIRE_TGT_ALIGN
6793 && !elf32xtensa_size_opt)
6798 if (seg_idx_end == ebb_table->action_count && !ebb->ends_unreachable)
6799 requires_text_end_align = TRUE;
6801 if (elf32xtensa_size_opt && !requires_text_end_align
6802 && action->align_type != EBB_REQUIRE_LOOP_ALIGN
6803 && action->align_type != EBB_REQUIRE_TGT_ALIGN)
6805 longcall_convert_count = longcall_count;
6806 narrowable_convert_count = narrowable_count;
6807 widenable_convert_count = 0;
6811 /* There is a constraint. Convert the max number of longcalls. */
6812 narrowable_convert_count = 0;
6813 longcall_convert_count = 0;
6814 widenable_convert_count = 0;
6816 for (j = 0; j < longcall_count; j++)
6818 int removed = (longcall_count - j) * 3 & (align - 1);
6819 unsigned desire_narrow = (align - removed) & (align - 1);
6820 unsigned desire_widen = removed;
6821 if (desire_narrow <= narrowable_count)
6823 narrowable_convert_count = desire_narrow;
6824 narrowable_convert_count +=
6825 (align * ((narrowable_count - narrowable_convert_count)
6827 longcall_convert_count = (longcall_count - j);
6828 widenable_convert_count = 0;
6831 if (desire_widen <= widenable_count && !elf32xtensa_size_opt)
6833 narrowable_convert_count = 0;
6834 longcall_convert_count = longcall_count - j;
6835 widenable_convert_count = desire_widen;
6841 /* Now the number of conversions are saved. Do them. */
6842 for (i = seg_idx_start; i < seg_idx_end; i++)
6844 action = &ebb_table->actions[i];
6845 switch (action->action)
6847 case ta_convert_longcall:
6848 if (longcall_convert_count != 0)
6850 action->action = ta_remove_longcall;
6851 action->do_action = TRUE;
6852 action->removed_bytes += 3;
6853 longcall_convert_count--;
6856 case ta_narrow_insn:
6857 if (narrowable_convert_count != 0)
6859 action->do_action = TRUE;
6860 action->removed_bytes += 1;
6861 narrowable_convert_count--;
6865 if (widenable_convert_count != 0)
6867 action->do_action = TRUE;
6868 action->removed_bytes -= 1;
6869 widenable_convert_count--;
6878 /* Now we move on to some local opts. Try to remove each of the
6879 remaining longcalls. */
6881 if (ebb_table->ebb.ends_section || ebb_table->ebb.ends_unreachable)
6884 for (i = 0; i < ebb_table->action_count; i++)
6886 int old_removed_bytes = removed_bytes;
6887 proposed_action *action = &ebb_table->actions[i];
6889 if (action->do_action && action->action == ta_convert_longcall)
6891 bfd_boolean bad_alignment = FALSE;
6893 for (j = i + 1; j < ebb_table->action_count; j++)
6895 proposed_action *new_action = &ebb_table->actions[j];
6896 bfd_vma offset = new_action->offset;
6897 if (new_action->align_type == EBB_REQUIRE_TGT_ALIGN)
6899 if (!check_branch_target_aligned
6900 (ebb_table->ebb.contents,
6901 ebb_table->ebb.content_length,
6902 offset, offset - removed_bytes))
6904 bad_alignment = TRUE;
6908 if (new_action->align_type == EBB_REQUIRE_LOOP_ALIGN)
6910 if (!check_loop_aligned (ebb_table->ebb.contents,
6911 ebb_table->ebb.content_length,
6913 offset - removed_bytes))
6915 bad_alignment = TRUE;
6919 if (new_action->action == ta_narrow_insn
6920 && !new_action->do_action
6921 && ebb_table->ebb.sec->alignment_power == 2)
6923 /* Narrow an instruction and we are done. */
6924 new_action->do_action = TRUE;
6925 new_action->removed_bytes += 1;
6926 bad_alignment = FALSE;
6929 if (new_action->action == ta_widen_insn
6930 && new_action->do_action
6931 && ebb_table->ebb.sec->alignment_power == 2)
6933 /* Narrow an instruction and we are done. */
6934 new_action->do_action = FALSE;
6935 new_action->removed_bytes += 1;
6936 bad_alignment = FALSE;
6939 if (new_action->do_action)
6940 removed_bytes += new_action->removed_bytes;
6944 action->removed_bytes += 3;
6945 action->action = ta_remove_longcall;
6946 action->do_action = TRUE;
6949 removed_bytes = old_removed_bytes;
6950 if (action->do_action)
6951 removed_bytes += action->removed_bytes;
6956 for (i = 0; i < ebb_table->action_count; ++i)
6958 proposed_action *action = &ebb_table->actions[i];
6959 if (action->do_action)
6960 removed_bytes += action->removed_bytes;
6963 if ((removed_bytes % (1 << ebb_table->ebb.sec->alignment_power)) != 0
6964 && ebb->ends_unreachable)
6966 proposed_action *action;
6970 BFD_ASSERT (ebb_table->action_count != 0);
6971 action = &ebb_table->actions[ebb_table->action_count - 1];
6972 BFD_ASSERT (action->action == ta_fill);
6973 BFD_ASSERT (ebb->ends_unreachable->flags & XTENSA_PROP_UNREACHABLE);
6975 extra_space = compute_fill_extra_space (ebb->ends_unreachable);
6976 br = action->removed_bytes + removed_bytes + extra_space;
6977 br = br & ((1 << ebb->sec->alignment_power ) - 1);
6979 action->removed_bytes = extra_space - br;
6985 /* The xlate_map is a sorted array of address mappings designed to
6986 answer the offset_with_removed_text() query with a binary search instead
6987 of a linear search through the section's action_list. */
6989 typedef struct xlate_map_entry xlate_map_entry_t;
6990 typedef struct xlate_map xlate_map_t;
6992 struct xlate_map_entry
6994 unsigned orig_address;
6995 unsigned new_address;
7001 unsigned entry_count;
7002 xlate_map_entry_t *entry;
7007 xlate_compare (const void *a_v, const void *b_v)
7009 const xlate_map_entry_t *a = (const xlate_map_entry_t *) a_v;
7010 const xlate_map_entry_t *b = (const xlate_map_entry_t *) b_v;
7011 if (a->orig_address < b->orig_address)
7013 if (a->orig_address > (b->orig_address + b->size - 1))
7020 xlate_offset_with_removed_text (const xlate_map_t *map,
7021 text_action_list *action_list,
7024 xlate_map_entry_t tmp;
7026 xlate_map_entry_t *e;
7029 return offset_with_removed_text (action_list, offset);
7031 if (map->entry_count == 0)
7034 tmp.orig_address = offset;
7035 tmp.new_address = offset;
7038 r = bsearch (&offset, map->entry, map->entry_count,
7039 sizeof (xlate_map_entry_t), &xlate_compare);
7040 e = (xlate_map_entry_t *) r;
7042 BFD_ASSERT (e != NULL);
7045 return e->new_address - e->orig_address + offset;
7049 /* Build a binary searchable offset translation map from a section's
7052 static xlate_map_t *
7053 build_xlate_map (asection *sec, xtensa_relax_info *relax_info)
7055 xlate_map_t *map = (xlate_map_t *) bfd_malloc (sizeof (xlate_map_t));
7056 text_action_list *action_list = &relax_info->action_list;
7057 unsigned num_actions = 0;
7060 xlate_map_entry_t *current_entry;
7065 num_actions = action_list_count (action_list);
7066 map->entry = (xlate_map_entry_t *)
7067 bfd_malloc (sizeof (xlate_map_entry_t) * (num_actions + 1));
7068 if (map->entry == NULL)
7073 map->entry_count = 0;
7076 current_entry = &map->entry[0];
7078 current_entry->orig_address = 0;
7079 current_entry->new_address = 0;
7080 current_entry->size = 0;
7082 for (r = action_list->head; r != NULL; r = r->next)
7084 unsigned orig_size = 0;
7088 case ta_remove_insn:
7089 case ta_convert_longcall:
7090 case ta_remove_literal:
7091 case ta_add_literal:
7093 case ta_remove_longcall:
7096 case ta_narrow_insn:
7105 current_entry->size =
7106 r->offset + orig_size - current_entry->orig_address;
7107 if (current_entry->size != 0)
7112 current_entry->orig_address = r->offset + orig_size;
7113 removed += r->removed_bytes;
7114 current_entry->new_address = r->offset + orig_size - removed;
7115 current_entry->size = 0;
7118 current_entry->size = (bfd_get_section_limit (sec->owner, sec)
7119 - current_entry->orig_address);
7120 if (current_entry->size != 0)
7127 /* Free an offset translation map. */
7130 free_xlate_map (xlate_map_t *map)
7132 if (map && map->entry)
7139 /* Use check_section_ebb_pcrels_fit to make sure that all of the
7140 relocations in a section will fit if a proposed set of actions
7144 check_section_ebb_pcrels_fit (bfd *abfd,
7147 Elf_Internal_Rela *internal_relocs,
7148 const ebb_constraint *constraint,
7149 const xtensa_opcode *reloc_opcodes)
7152 Elf_Internal_Rela *irel;
7153 xlate_map_t *xmap = NULL;
7154 bfd_boolean ok = TRUE;
7155 xtensa_relax_info *relax_info;
7157 relax_info = get_xtensa_relax_info (sec);
7159 if (relax_info && sec->reloc_count > 100)
7161 xmap = build_xlate_map (sec, relax_info);
7162 /* NULL indicates out of memory, but the slow version
7163 can still be used. */
7166 for (i = 0; i < sec->reloc_count; i++)
7169 bfd_vma orig_self_offset, orig_target_offset;
7170 bfd_vma self_offset, target_offset;
7172 reloc_howto_type *howto;
7173 int self_removed_bytes, target_removed_bytes;
7175 irel = &internal_relocs[i];
7176 r_type = ELF32_R_TYPE (irel->r_info);
7178 howto = &elf_howto_table[r_type];
7179 /* We maintain the required invariant: PC-relative relocations
7180 that fit before linking must fit after linking. Thus we only
7181 need to deal with relocations to the same section that are
7183 if (ELF32_R_TYPE (irel->r_info) == R_XTENSA_ASM_SIMPLIFY
7184 || !howto->pc_relative)
7187 r_reloc_init (&r_rel, abfd, irel, contents,
7188 bfd_get_section_limit (abfd, sec));
7190 if (r_reloc_get_section (&r_rel) != sec)
7193 orig_self_offset = irel->r_offset;
7194 orig_target_offset = r_rel.target_offset;
7196 self_offset = orig_self_offset;
7197 target_offset = orig_target_offset;
7202 xlate_offset_with_removed_text (xmap, &relax_info->action_list,
7205 xlate_offset_with_removed_text (xmap, &relax_info->action_list,
7206 orig_target_offset);
7209 self_removed_bytes = 0;
7210 target_removed_bytes = 0;
7212 for (j = 0; j < constraint->action_count; ++j)
7214 proposed_action *action = &constraint->actions[j];
7215 bfd_vma offset = action->offset;
7216 int removed_bytes = action->removed_bytes;
7217 if (offset < orig_self_offset
7218 || (offset == orig_self_offset && action->action == ta_fill
7219 && action->removed_bytes < 0))
7220 self_removed_bytes += removed_bytes;
7221 if (offset < orig_target_offset
7222 || (offset == orig_target_offset && action->action == ta_fill
7223 && action->removed_bytes < 0))
7224 target_removed_bytes += removed_bytes;
7226 self_offset -= self_removed_bytes;
7227 target_offset -= target_removed_bytes;
7229 /* Try to encode it. Get the operand and check. */
7230 if (is_alt_relocation (ELF32_R_TYPE (irel->r_info)))
7232 /* None of the current alternate relocs are PC-relative,
7233 and only PC-relative relocs matter here. */
7237 xtensa_opcode opcode;
7241 opcode = reloc_opcodes[i];
7243 opcode = get_relocation_opcode (abfd, sec, contents, irel);
7244 if (opcode == XTENSA_UNDEFINED)
7250 opnum = get_relocation_opnd (opcode, ELF32_R_TYPE (irel->r_info));
7251 if (opnum == XTENSA_UNDEFINED)
7257 if (!pcrel_reloc_fits (opcode, opnum, self_offset, target_offset))
7266 free_xlate_map (xmap);
7273 check_section_ebb_reduces (const ebb_constraint *constraint)
7278 for (i = 0; i < constraint->action_count; i++)
7280 const proposed_action *action = &constraint->actions[i];
7281 if (action->do_action)
7282 removed += action->removed_bytes;
7292 text_action_add_proposed (text_action_list *l,
7293 const ebb_constraint *ebb_table,
7298 for (i = 0; i < ebb_table->action_count; i++)
7300 proposed_action *action = &ebb_table->actions[i];
7302 if (!action->do_action)
7304 switch (action->action)
7306 case ta_remove_insn:
7307 case ta_remove_longcall:
7308 case ta_convert_longcall:
7309 case ta_narrow_insn:
7312 case ta_remove_literal:
7313 text_action_add (l, action->action, sec, action->offset,
7314 action->removed_bytes);
7327 compute_fill_extra_space (property_table_entry *entry)
7329 int fill_extra_space;
7334 if ((entry->flags & XTENSA_PROP_UNREACHABLE) == 0)
7337 fill_extra_space = entry->size;
7338 if ((entry->flags & XTENSA_PROP_ALIGN) != 0)
7340 /* Fill bytes for alignment:
7341 (2**n)-1 - (addr + (2**n)-1) & (2**n -1) */
7342 int pow = GET_XTENSA_PROP_ALIGNMENT (entry->flags);
7343 int nsm = (1 << pow) - 1;
7344 bfd_vma addr = entry->address + entry->size;
7345 bfd_vma align_fill = nsm - ((addr + nsm) & nsm);
7346 fill_extra_space += align_fill;
7348 return fill_extra_space;
7352 /* First relaxation pass. */
7354 /* If the section contains relaxable literals, check each literal to
7355 see if it has the same value as another literal that has already
7356 been seen, either in the current section or a previous one. If so,
7357 add an entry to the per-section list of removed literals. The
7358 actual changes are deferred until the next pass. */
7361 compute_removed_literals (bfd *abfd,
7363 struct bfd_link_info *link_info,
7364 value_map_hash_table *values)
7366 xtensa_relax_info *relax_info;
7368 Elf_Internal_Rela *internal_relocs;
7369 source_reloc *src_relocs, *rel;
7370 bfd_boolean ok = TRUE;
7371 property_table_entry *prop_table = NULL;
7374 bfd_boolean last_loc_is_prev = FALSE;
7375 bfd_vma last_target_offset = 0;
7376 section_cache_t target_sec_cache;
7377 bfd_size_type sec_size;
7379 init_section_cache (&target_sec_cache);
7381 /* Do nothing if it is not a relaxable literal section. */
7382 relax_info = get_xtensa_relax_info (sec);
7383 BFD_ASSERT (relax_info);
7384 if (!relax_info->is_relaxable_literal_section)
7387 internal_relocs = retrieve_internal_relocs (abfd, sec,
7388 link_info->keep_memory);
7390 sec_size = bfd_get_section_limit (abfd, sec);
7391 contents = retrieve_contents (abfd, sec, link_info->keep_memory);
7392 if (contents == NULL && sec_size != 0)
7398 /* Sort the source_relocs by target offset. */
7399 src_relocs = relax_info->src_relocs;
7400 qsort (src_relocs, relax_info->src_count,
7401 sizeof (source_reloc), source_reloc_compare);
7402 qsort (internal_relocs, sec->reloc_count, sizeof (Elf_Internal_Rela),
7403 internal_reloc_compare);
7405 ptblsize = xtensa_read_table_entries (abfd, sec, &prop_table,
7406 XTENSA_PROP_SEC_NAME, FALSE);
7414 for (i = 0; i < relax_info->src_count; i++)
7416 Elf_Internal_Rela *irel = NULL;
7418 rel = &src_relocs[i];
7419 if (get_l32r_opcode () != rel->opcode)
7421 irel = get_irel_at_offset (sec, internal_relocs,
7422 rel->r_rel.target_offset);
7424 /* If the relocation on this is not a simple R_XTENSA_32 or
7425 R_XTENSA_PLT then do not consider it. This may happen when
7426 the difference of two symbols is used in a literal. */
7427 if (irel && (ELF32_R_TYPE (irel->r_info) != R_XTENSA_32
7428 && ELF32_R_TYPE (irel->r_info) != R_XTENSA_PLT))
7431 /* If the target_offset for this relocation is the same as the
7432 previous relocation, then we've already considered whether the
7433 literal can be coalesced. Skip to the next one.... */
7434 if (i != 0 && prev_i != -1
7435 && src_relocs[i-1].r_rel.target_offset == rel->r_rel.target_offset)
7439 if (last_loc_is_prev &&
7440 last_target_offset + 4 != rel->r_rel.target_offset)
7441 last_loc_is_prev = FALSE;
7443 /* Check if the relocation was from an L32R that is being removed
7444 because a CALLX was converted to a direct CALL, and check if
7445 there are no other relocations to the literal. */
7446 if (is_removable_literal (rel, i, src_relocs, relax_info->src_count,
7447 sec, prop_table, ptblsize))
7449 if (!remove_dead_literal (abfd, sec, link_info, internal_relocs,
7450 irel, rel, prop_table, ptblsize))
7455 last_target_offset = rel->r_rel.target_offset;
7459 if (!identify_literal_placement (abfd, sec, contents, link_info,
7461 &last_loc_is_prev, irel,
7462 relax_info->src_count - i, rel,
7463 prop_table, ptblsize,
7464 &target_sec_cache, rel->is_abs_literal))
7469 last_target_offset = rel->r_rel.target_offset;
7473 print_removed_literals (stderr, &relax_info->removed_list);
7474 print_action_list (stderr, &relax_info->action_list);
7478 if (prop_table) free (prop_table);
7479 clear_section_cache (&target_sec_cache);
7481 release_contents (sec, contents);
7482 release_internal_relocs (sec, internal_relocs);
7487 static Elf_Internal_Rela *
7488 get_irel_at_offset (asection *sec,
7489 Elf_Internal_Rela *internal_relocs,
7493 Elf_Internal_Rela *irel;
7495 Elf_Internal_Rela key;
7497 if (!internal_relocs)
7500 key.r_offset = offset;
7501 irel = bsearch (&key, internal_relocs, sec->reloc_count,
7502 sizeof (Elf_Internal_Rela), internal_reloc_matches);
7506 /* bsearch does not guarantee which will be returned if there are
7507 multiple matches. We need the first that is not an alignment. */
7508 i = irel - internal_relocs;
7511 if (internal_relocs[i-1].r_offset != offset)
7515 for ( ; i < sec->reloc_count; i++)
7517 irel = &internal_relocs[i];
7518 r_type = ELF32_R_TYPE (irel->r_info);
7519 if (irel->r_offset == offset && r_type != R_XTENSA_NONE)
7528 is_removable_literal (const source_reloc *rel,
7530 const source_reloc *src_relocs,
7533 property_table_entry *prop_table,
7536 const source_reloc *curr_rel;
7537 property_table_entry *entry;
7542 entry = elf_xtensa_find_property_entry (prop_table, ptblsize,
7543 sec->vma + rel->r_rel.target_offset);
7544 if (entry && (entry->flags & XTENSA_PROP_NO_TRANSFORM))
7547 for (++i; i < src_count; ++i)
7549 curr_rel = &src_relocs[i];
7550 /* If all others have the same target offset.... */
7551 if (curr_rel->r_rel.target_offset != rel->r_rel.target_offset)
7554 if (!curr_rel->is_null
7555 && !xtensa_is_property_section (curr_rel->source_sec)
7556 && !(curr_rel->source_sec->flags & SEC_DEBUGGING))
7564 remove_dead_literal (bfd *abfd,
7566 struct bfd_link_info *link_info,
7567 Elf_Internal_Rela *internal_relocs,
7568 Elf_Internal_Rela *irel,
7570 property_table_entry *prop_table,
7573 property_table_entry *entry;
7574 xtensa_relax_info *relax_info;
7576 relax_info = get_xtensa_relax_info (sec);
7580 entry = elf_xtensa_find_property_entry (prop_table, ptblsize,
7581 sec->vma + rel->r_rel.target_offset);
7583 /* Mark the unused literal so that it will be removed. */
7584 add_removed_literal (&relax_info->removed_list, &rel->r_rel, NULL);
7586 text_action_add (&relax_info->action_list,
7587 ta_remove_literal, sec, rel->r_rel.target_offset, 4);
7589 /* If the section is 4-byte aligned, do not add fill. */
7590 if (sec->alignment_power > 2)
7592 int fill_extra_space;
7593 bfd_vma entry_sec_offset;
7595 property_table_entry *the_add_entry;
7599 entry_sec_offset = entry->address - sec->vma + entry->size;
7601 entry_sec_offset = rel->r_rel.target_offset + 4;
7603 /* If the literal range is at the end of the section,
7605 the_add_entry = elf_xtensa_find_property_entry (prop_table, ptblsize,
7607 fill_extra_space = compute_fill_extra_space (the_add_entry);
7609 fa = find_fill_action (&relax_info->action_list, sec, entry_sec_offset);
7610 removed_diff = compute_removed_action_diff (fa, sec, entry_sec_offset,
7611 -4, fill_extra_space);
7613 adjust_fill_action (fa, removed_diff);
7615 text_action_add (&relax_info->action_list,
7616 ta_fill, sec, entry_sec_offset, removed_diff);
7619 /* Zero out the relocation on this literal location. */
7622 if (elf_hash_table (link_info)->dynamic_sections_created)
7623 shrink_dynamic_reloc_sections (link_info, abfd, sec, irel);
7625 irel->r_info = ELF32_R_INFO (0, R_XTENSA_NONE);
7626 pin_internal_relocs (sec, internal_relocs);
7629 /* Do not modify "last_loc_is_prev". */
7635 identify_literal_placement (bfd *abfd,
7638 struct bfd_link_info *link_info,
7639 value_map_hash_table *values,
7640 bfd_boolean *last_loc_is_prev_p,
7641 Elf_Internal_Rela *irel,
7642 int remaining_src_rels,
7644 property_table_entry *prop_table,
7646 section_cache_t *target_sec_cache,
7647 bfd_boolean is_abs_literal)
7651 xtensa_relax_info *relax_info;
7652 bfd_boolean literal_placed = FALSE;
7654 unsigned long value;
7655 bfd_boolean final_static_link;
7656 bfd_size_type sec_size;
7658 relax_info = get_xtensa_relax_info (sec);
7662 sec_size = bfd_get_section_limit (abfd, sec);
7665 (!link_info->relocatable
7666 && !elf_hash_table (link_info)->dynamic_sections_created);
7668 /* The placement algorithm first checks to see if the literal is
7669 already in the value map. If so and the value map is reachable
7670 from all uses, then the literal is moved to that location. If
7671 not, then we identify the last location where a fresh literal was
7672 placed. If the literal can be safely moved there, then we do so.
7673 If not, then we assume that the literal is not to move and leave
7674 the literal where it is, marking it as the last literal
7677 /* Find the literal value. */
7679 r_reloc_init (&r_rel, abfd, irel, contents, sec_size);
7682 BFD_ASSERT (rel->r_rel.target_offset < sec_size);
7683 value = bfd_get_32 (abfd, contents + rel->r_rel.target_offset);
7685 init_literal_value (&val, &r_rel, value, is_abs_literal);
7687 /* Check if we've seen another literal with the same value that
7688 is in the same output section. */
7689 val_map = value_map_get_cached_value (values, &val, final_static_link);
7692 && (r_reloc_get_section (&val_map->loc)->output_section
7693 == sec->output_section)
7694 && relocations_reach (rel, remaining_src_rels, &val_map->loc)
7695 && coalesce_shared_literal (sec, rel, prop_table, ptblsize, val_map))
7697 /* No change to last_loc_is_prev. */
7698 literal_placed = TRUE;
7701 /* For relocatable links, do not try to move literals. To do it
7702 correctly might increase the number of relocations in an input
7703 section making the default relocatable linking fail. */
7704 if (!link_info->relocatable && !literal_placed
7705 && values->has_last_loc && !(*last_loc_is_prev_p))
7707 asection *target_sec = r_reloc_get_section (&values->last_loc);
7708 if (target_sec && target_sec->output_section == sec->output_section)
7710 /* Increment the virtual offset. */
7711 r_reloc try_loc = values->last_loc;
7712 try_loc.virtual_offset += 4;
7714 /* There is a last loc that was in the same output section. */
7715 if (relocations_reach (rel, remaining_src_rels, &try_loc)
7716 && move_shared_literal (sec, link_info, rel,
7717 prop_table, ptblsize,
7718 &try_loc, &val, target_sec_cache))
7720 values->last_loc.virtual_offset += 4;
7721 literal_placed = TRUE;
7723 val_map = add_value_map (values, &val, &try_loc,
7726 val_map->loc = try_loc;
7731 if (!literal_placed)
7733 /* Nothing worked, leave the literal alone but update the last loc. */
7734 values->has_last_loc = TRUE;
7735 values->last_loc = rel->r_rel;
7737 val_map = add_value_map (values, &val, &rel->r_rel, final_static_link);
7739 val_map->loc = rel->r_rel;
7740 *last_loc_is_prev_p = TRUE;
7747 /* Check if the original relocations (presumably on L32R instructions)
7748 identified by reloc[0..N] can be changed to reference the literal
7749 identified by r_rel. If r_rel is out of range for any of the
7750 original relocations, then we don't want to coalesce the original
7751 literal with the one at r_rel. We only check reloc[0..N], where the
7752 offsets are all the same as for reloc[0] (i.e., they're all
7753 referencing the same literal) and where N is also bounded by the
7754 number of remaining entries in the "reloc" array. The "reloc" array
7755 is sorted by target offset so we know all the entries for the same
7756 literal will be contiguous. */
7759 relocations_reach (source_reloc *reloc,
7760 int remaining_relocs,
7761 const r_reloc *r_rel)
7763 bfd_vma from_offset, source_address, dest_address;
7767 if (!r_reloc_is_defined (r_rel))
7770 sec = r_reloc_get_section (r_rel);
7771 from_offset = reloc[0].r_rel.target_offset;
7773 for (i = 0; i < remaining_relocs; i++)
7775 if (reloc[i].r_rel.target_offset != from_offset)
7778 /* Ignore relocations that have been removed. */
7779 if (reloc[i].is_null)
7782 /* The original and new output section for these must be the same
7783 in order to coalesce. */
7784 if (r_reloc_get_section (&reloc[i].r_rel)->output_section
7785 != sec->output_section)
7788 /* Absolute literals in the same output section can always be
7790 if (reloc[i].is_abs_literal)
7793 /* A literal with no PC-relative relocations can be moved anywhere. */
7794 if (reloc[i].opnd != -1)
7796 /* Otherwise, check to see that it fits. */
7797 source_address = (reloc[i].source_sec->output_section->vma
7798 + reloc[i].source_sec->output_offset
7799 + reloc[i].r_rel.rela.r_offset);
7800 dest_address = (sec->output_section->vma
7801 + sec->output_offset
7802 + r_rel->target_offset);
7804 if (!pcrel_reloc_fits (reloc[i].opcode, reloc[i].opnd,
7805 source_address, dest_address))
7814 /* Move a literal to another literal location because it is
7815 the same as the other literal value. */
7818 coalesce_shared_literal (asection *sec,
7820 property_table_entry *prop_table,
7824 property_table_entry *entry;
7826 property_table_entry *the_add_entry;
7828 xtensa_relax_info *relax_info;
7830 relax_info = get_xtensa_relax_info (sec);
7834 entry = elf_xtensa_find_property_entry
7835 (prop_table, ptblsize, sec->vma + rel->r_rel.target_offset);
7836 if (entry && (entry->flags & XTENSA_PROP_NO_TRANSFORM))
7839 /* Mark that the literal will be coalesced. */
7840 add_removed_literal (&relax_info->removed_list, &rel->r_rel, &val_map->loc);
7842 text_action_add (&relax_info->action_list,
7843 ta_remove_literal, sec, rel->r_rel.target_offset, 4);
7845 /* If the section is 4-byte aligned, do not add fill. */
7846 if (sec->alignment_power > 2)
7848 int fill_extra_space;
7849 bfd_vma entry_sec_offset;
7852 entry_sec_offset = entry->address - sec->vma + entry->size;
7854 entry_sec_offset = rel->r_rel.target_offset + 4;
7856 /* If the literal range is at the end of the section,
7858 fill_extra_space = 0;
7859 the_add_entry = elf_xtensa_find_property_entry (prop_table, ptblsize,
7861 if (the_add_entry && (the_add_entry->flags & XTENSA_PROP_UNREACHABLE))
7862 fill_extra_space = the_add_entry->size;
7864 fa = find_fill_action (&relax_info->action_list, sec, entry_sec_offset);
7865 removed_diff = compute_removed_action_diff (fa, sec, entry_sec_offset,
7866 -4, fill_extra_space);
7868 adjust_fill_action (fa, removed_diff);
7870 text_action_add (&relax_info->action_list,
7871 ta_fill, sec, entry_sec_offset, removed_diff);
7878 /* Move a literal to another location. This may actually increase the
7879 total amount of space used because of alignments so we need to do
7880 this carefully. Also, it may make a branch go out of range. */
7883 move_shared_literal (asection *sec,
7884 struct bfd_link_info *link_info,
7886 property_table_entry *prop_table,
7888 const r_reloc *target_loc,
7889 const literal_value *lit_value,
7890 section_cache_t *target_sec_cache)
7892 property_table_entry *the_add_entry, *src_entry, *target_entry = NULL;
7893 text_action *fa, *target_fa;
7895 xtensa_relax_info *relax_info, *target_relax_info;
7896 asection *target_sec;
7898 ebb_constraint ebb_table;
7899 bfd_boolean relocs_fit;
7901 /* If this routine always returns FALSE, the literals that cannot be
7902 coalesced will not be moved. */
7903 if (elf32xtensa_no_literal_movement)
7906 relax_info = get_xtensa_relax_info (sec);
7910 target_sec = r_reloc_get_section (target_loc);
7911 target_relax_info = get_xtensa_relax_info (target_sec);
7913 /* Literals to undefined sections may not be moved because they
7914 must report an error. */
7915 if (bfd_is_und_section (target_sec))
7918 src_entry = elf_xtensa_find_property_entry
7919 (prop_table, ptblsize, sec->vma + rel->r_rel.target_offset);
7921 if (!section_cache_section (target_sec_cache, target_sec, link_info))
7924 target_entry = elf_xtensa_find_property_entry
7925 (target_sec_cache->ptbl, target_sec_cache->pte_count,
7926 target_sec->vma + target_loc->target_offset);
7931 /* Make sure that we have not broken any branches. */
7934 init_ebb_constraint (&ebb_table);
7935 ebb = &ebb_table.ebb;
7936 init_ebb (ebb, target_sec_cache->sec, target_sec_cache->contents,
7937 target_sec_cache->content_length,
7938 target_sec_cache->ptbl, target_sec_cache->pte_count,
7939 target_sec_cache->relocs, target_sec_cache->reloc_count);
7941 /* Propose to add 4 bytes + worst-case alignment size increase to
7943 ebb_propose_action (&ebb_table, EBB_NO_ALIGN, 0,
7944 ta_fill, target_loc->target_offset,
7945 -4 - (1 << target_sec->alignment_power), TRUE);
7947 /* Check all of the PC-relative relocations to make sure they still fit. */
7948 relocs_fit = check_section_ebb_pcrels_fit (target_sec->owner, target_sec,
7949 target_sec_cache->contents,
7950 target_sec_cache->relocs,
7956 text_action_add_literal (&target_relax_info->action_list,
7957 ta_add_literal, target_loc, lit_value, -4);
7959 if (target_sec->alignment_power > 2 && target_entry != src_entry)
7961 /* May need to add or remove some fill to maintain alignment. */
7962 int fill_extra_space;
7963 bfd_vma entry_sec_offset;
7966 target_entry->address - target_sec->vma + target_entry->size;
7968 /* If the literal range is at the end of the section,
7970 fill_extra_space = 0;
7972 elf_xtensa_find_property_entry (target_sec_cache->ptbl,
7973 target_sec_cache->pte_count,
7975 if (the_add_entry && (the_add_entry->flags & XTENSA_PROP_UNREACHABLE))
7976 fill_extra_space = the_add_entry->size;
7978 target_fa = find_fill_action (&target_relax_info->action_list,
7979 target_sec, entry_sec_offset);
7980 removed_diff = compute_removed_action_diff (target_fa, target_sec,
7981 entry_sec_offset, 4,
7984 adjust_fill_action (target_fa, removed_diff);
7986 text_action_add (&target_relax_info->action_list,
7987 ta_fill, target_sec, entry_sec_offset, removed_diff);
7990 /* Mark that the literal will be moved to the new location. */
7991 add_removed_literal (&relax_info->removed_list, &rel->r_rel, target_loc);
7993 /* Remove the literal. */
7994 text_action_add (&relax_info->action_list,
7995 ta_remove_literal, sec, rel->r_rel.target_offset, 4);
7997 /* If the section is 4-byte aligned, do not add fill. */
7998 if (sec->alignment_power > 2 && target_entry != src_entry)
8000 int fill_extra_space;
8001 bfd_vma entry_sec_offset;
8004 entry_sec_offset = src_entry->address - sec->vma + src_entry->size;
8006 entry_sec_offset = rel->r_rel.target_offset+4;
8008 /* If the literal range is at the end of the section,
8010 fill_extra_space = 0;
8011 the_add_entry = elf_xtensa_find_property_entry (prop_table, ptblsize,
8013 if (the_add_entry && (the_add_entry->flags & XTENSA_PROP_UNREACHABLE))
8014 fill_extra_space = the_add_entry->size;
8016 fa = find_fill_action (&relax_info->action_list, sec, entry_sec_offset);
8017 removed_diff = compute_removed_action_diff (fa, sec, entry_sec_offset,
8018 -4, fill_extra_space);
8020 adjust_fill_action (fa, removed_diff);
8022 text_action_add (&relax_info->action_list,
8023 ta_fill, sec, entry_sec_offset, removed_diff);
8030 /* Second relaxation pass. */
8032 /* Modify all of the relocations to point to the right spot, and if this
8033 is a relaxable section, delete the unwanted literals and fix the
8037 relax_section (bfd *abfd, asection *sec, struct bfd_link_info *link_info)
8039 Elf_Internal_Rela *internal_relocs;
8040 xtensa_relax_info *relax_info;
8042 bfd_boolean ok = TRUE;
8044 bfd_boolean rv = FALSE;
8045 bfd_boolean virtual_action;
8046 bfd_size_type sec_size;
8048 sec_size = bfd_get_section_limit (abfd, sec);
8049 relax_info = get_xtensa_relax_info (sec);
8050 BFD_ASSERT (relax_info);
8052 /* First translate any of the fixes that have been added already. */
8053 translate_section_fixes (sec);
8055 /* Handle property sections (e.g., literal tables) specially. */
8056 if (xtensa_is_property_section (sec))
8058 BFD_ASSERT (!relax_info->is_relaxable_literal_section);
8059 return relax_property_section (abfd, sec, link_info);
8062 internal_relocs = retrieve_internal_relocs (abfd, sec,
8063 link_info->keep_memory);
8064 contents = retrieve_contents (abfd, sec, link_info->keep_memory);
8065 if (contents == NULL && sec_size != 0)
8071 if (internal_relocs)
8073 for (i = 0; i < sec->reloc_count; i++)
8075 Elf_Internal_Rela *irel;
8076 xtensa_relax_info *target_relax_info;
8077 bfd_vma source_offset, old_source_offset;
8080 asection *target_sec;
8082 /* Locally change the source address.
8083 Translate the target to the new target address.
8084 If it points to this section and has been removed,
8088 irel = &internal_relocs[i];
8089 source_offset = irel->r_offset;
8090 old_source_offset = source_offset;
8092 r_type = ELF32_R_TYPE (irel->r_info);
8093 r_reloc_init (&r_rel, abfd, irel, contents,
8094 bfd_get_section_limit (abfd, sec));
8096 /* If this section could have changed then we may need to
8097 change the relocation's offset. */
8099 if (relax_info->is_relaxable_literal_section
8100 || relax_info->is_relaxable_asm_section)
8102 if (r_type != R_XTENSA_NONE
8103 && find_removed_literal (&relax_info->removed_list,
8106 /* Remove this relocation. */
8107 if (elf_hash_table (link_info)->dynamic_sections_created)
8108 shrink_dynamic_reloc_sections (link_info, abfd, sec, irel);
8109 irel->r_info = ELF32_R_INFO (0, R_XTENSA_NONE);
8110 irel->r_offset = offset_with_removed_text
8111 (&relax_info->action_list, irel->r_offset);
8112 pin_internal_relocs (sec, internal_relocs);
8116 if (r_type == R_XTENSA_ASM_SIMPLIFY)
8118 text_action *action =
8119 find_insn_action (&relax_info->action_list,
8121 if (action && (action->action == ta_convert_longcall
8122 || action->action == ta_remove_longcall))
8124 bfd_reloc_status_type retval;
8125 char *error_message = NULL;
8127 retval = contract_asm_expansion (contents, sec_size,
8128 irel, &error_message);
8129 if (retval != bfd_reloc_ok)
8131 (*link_info->callbacks->reloc_dangerous)
8132 (link_info, error_message, abfd, sec,
8136 /* Update the action so that the code that moves
8137 the contents will do the right thing. */
8138 if (action->action == ta_remove_longcall)
8139 action->action = ta_remove_insn;
8141 action->action = ta_none;
8142 /* Refresh the info in the r_rel. */
8143 r_reloc_init (&r_rel, abfd, irel, contents, sec_size);
8144 r_type = ELF32_R_TYPE (irel->r_info);
8148 source_offset = offset_with_removed_text
8149 (&relax_info->action_list, irel->r_offset);
8150 irel->r_offset = source_offset;
8153 /* If the target section could have changed then
8154 we may need to change the relocation's target offset. */
8156 target_sec = r_reloc_get_section (&r_rel);
8157 target_relax_info = get_xtensa_relax_info (target_sec);
8159 if (target_relax_info
8160 && (target_relax_info->is_relaxable_literal_section
8161 || target_relax_info->is_relaxable_asm_section))
8165 bfd_vma addend_displacement;
8167 translate_reloc (&r_rel, &new_reloc);
8169 if (r_type == R_XTENSA_DIFF8
8170 || r_type == R_XTENSA_DIFF16
8171 || r_type == R_XTENSA_DIFF32)
8173 bfd_vma diff_value = 0, new_end_offset, diff_mask = 0;
8175 if (bfd_get_section_limit (abfd, sec) < old_source_offset)
8177 (*link_info->callbacks->reloc_dangerous)
8178 (link_info, _("invalid relocation address"),
8179 abfd, sec, old_source_offset);
8185 case R_XTENSA_DIFF8:
8187 bfd_get_8 (abfd, &contents[old_source_offset]);
8189 case R_XTENSA_DIFF16:
8191 bfd_get_16 (abfd, &contents[old_source_offset]);
8193 case R_XTENSA_DIFF32:
8195 bfd_get_32 (abfd, &contents[old_source_offset]);
8199 new_end_offset = offset_with_removed_text
8200 (&target_relax_info->action_list,
8201 r_rel.target_offset + diff_value);
8202 diff_value = new_end_offset - new_reloc.target_offset;
8206 case R_XTENSA_DIFF8:
8208 bfd_put_8 (abfd, diff_value,
8209 &contents[old_source_offset]);
8211 case R_XTENSA_DIFF16:
8213 bfd_put_16 (abfd, diff_value,
8214 &contents[old_source_offset]);
8216 case R_XTENSA_DIFF32:
8217 diff_mask = 0xffffffff;
8218 bfd_put_32 (abfd, diff_value,
8219 &contents[old_source_offset]);
8223 /* Check for overflow. */
8224 if ((diff_value & ~diff_mask) != 0)
8226 (*link_info->callbacks->reloc_dangerous)
8227 (link_info, _("overflow after relaxation"),
8228 abfd, sec, old_source_offset);
8232 pin_contents (sec, contents);
8235 /* FIXME: If the relocation still references a section in
8236 the same input file, the relocation should be modified
8237 directly instead of adding a "fix" record. */
8239 addend_displacement =
8240 new_reloc.target_offset + new_reloc.virtual_offset;
8242 fix = reloc_bfd_fix_init (sec, source_offset, r_type,
8243 r_reloc_get_section (&new_reloc),
8244 addend_displacement, TRUE);
8248 pin_internal_relocs (sec, internal_relocs);
8252 if ((relax_info->is_relaxable_literal_section
8253 || relax_info->is_relaxable_asm_section)
8254 && relax_info->action_list.head)
8256 /* Walk through the planned actions and build up a table
8257 of move, copy and fill records. Use the move, copy and
8258 fill records to perform the actions once. */
8260 bfd_size_type size = sec->size;
8262 bfd_size_type final_size, copy_size, orig_insn_size;
8263 bfd_byte *scratch = NULL;
8264 bfd_byte *dup_contents = NULL;
8265 bfd_size_type orig_size = size;
8266 bfd_vma orig_dot = 0;
8267 bfd_vma orig_dot_copied = 0; /* Byte copied already from
8268 orig dot in physical memory. */
8269 bfd_vma orig_dot_vo = 0; /* Virtual offset from orig_dot. */
8270 bfd_vma dup_dot = 0;
8272 text_action *action = relax_info->action_list.head;
8274 final_size = sec->size;
8275 for (action = relax_info->action_list.head; action;
8276 action = action->next)
8278 final_size -= action->removed_bytes;
8281 scratch = (bfd_byte *) bfd_zmalloc (final_size);
8282 dup_contents = (bfd_byte *) bfd_zmalloc (final_size);
8284 /* The dot is the current fill location. */
8286 print_action_list (stderr, &relax_info->action_list);
8289 for (action = relax_info->action_list.head; action;
8290 action = action->next)
8292 virtual_action = FALSE;
8293 if (action->offset > orig_dot)
8295 orig_dot += orig_dot_copied;
8296 orig_dot_copied = 0;
8298 /* Out of the virtual world. */
8301 if (action->offset > orig_dot)
8303 copy_size = action->offset - orig_dot;
8304 memmove (&dup_contents[dup_dot], &contents[orig_dot], copy_size);
8305 orig_dot += copy_size;
8306 dup_dot += copy_size;
8307 BFD_ASSERT (action->offset == orig_dot);
8309 else if (action->offset < orig_dot)
8311 if (action->action == ta_fill
8312 && action->offset - action->removed_bytes == orig_dot)
8314 /* This is OK because the fill only effects the dup_dot. */
8316 else if (action->action == ta_add_literal)
8318 /* TBD. Might need to handle this. */
8321 if (action->offset == orig_dot)
8323 if (action->virtual_offset > orig_dot_vo)
8325 if (orig_dot_vo == 0)
8327 /* Need to copy virtual_offset bytes. Probably four. */
8328 copy_size = action->virtual_offset - orig_dot_vo;
8329 memmove (&dup_contents[dup_dot],
8330 &contents[orig_dot], copy_size);
8331 orig_dot_copied = copy_size;
8332 dup_dot += copy_size;
8334 virtual_action = TRUE;
8337 BFD_ASSERT (action->virtual_offset <= orig_dot_vo);
8339 switch (action->action)
8341 case ta_remove_literal:
8342 case ta_remove_insn:
8343 BFD_ASSERT (action->removed_bytes >= 0);
8344 orig_dot += action->removed_bytes;
8347 case ta_narrow_insn:
8350 memmove (scratch, &contents[orig_dot], orig_insn_size);
8351 BFD_ASSERT (action->removed_bytes == 1);
8352 rv = narrow_instruction (scratch, final_size, 0);
8354 memmove (&dup_contents[dup_dot], scratch, copy_size);
8355 orig_dot += orig_insn_size;
8356 dup_dot += copy_size;
8360 if (action->removed_bytes >= 0)
8361 orig_dot += action->removed_bytes;
8364 /* Already zeroed in dup_contents. Just bump the
8366 dup_dot += (-action->removed_bytes);
8371 BFD_ASSERT (action->removed_bytes == 0);
8374 case ta_convert_longcall:
8375 case ta_remove_longcall:
8376 /* These will be removed or converted before we get here. */
8383 memmove (scratch, &contents[orig_dot], orig_insn_size);
8384 BFD_ASSERT (action->removed_bytes == -1);
8385 rv = widen_instruction (scratch, final_size, 0);
8387 memmove (&dup_contents[dup_dot], scratch, copy_size);
8388 orig_dot += orig_insn_size;
8389 dup_dot += copy_size;
8392 case ta_add_literal:
8395 BFD_ASSERT (action->removed_bytes == -4);
8396 /* TBD -- place the literal value here and insert
8398 memset (&dup_contents[dup_dot], 0, 4);
8399 pin_internal_relocs (sec, internal_relocs);
8400 pin_contents (sec, contents);
8402 if (!move_literal (abfd, link_info, sec, dup_dot, dup_contents,
8403 relax_info, &internal_relocs, &action->value))
8407 orig_dot_vo += copy_size;
8409 orig_dot += orig_insn_size;
8410 dup_dot += copy_size;
8414 /* Not implemented yet. */
8419 size -= action->removed_bytes;
8420 removed += action->removed_bytes;
8421 BFD_ASSERT (dup_dot <= final_size);
8422 BFD_ASSERT (orig_dot <= orig_size);
8425 orig_dot += orig_dot_copied;
8426 orig_dot_copied = 0;
8428 if (orig_dot != orig_size)
8430 copy_size = orig_size - orig_dot;
8431 BFD_ASSERT (orig_size > orig_dot);
8432 BFD_ASSERT (dup_dot + copy_size == final_size);
8433 memmove (&dup_contents[dup_dot], &contents[orig_dot], copy_size);
8434 orig_dot += copy_size;
8435 dup_dot += copy_size;
8437 BFD_ASSERT (orig_size == orig_dot);
8438 BFD_ASSERT (final_size == dup_dot);
8440 /* Move the dup_contents back. */
8441 if (final_size > orig_size)
8443 /* Contents need to be reallocated. Swap the dup_contents into
8445 sec->contents = dup_contents;
8447 contents = dup_contents;
8448 pin_contents (sec, contents);
8452 BFD_ASSERT (final_size <= orig_size);
8453 memset (contents, 0, orig_size);
8454 memcpy (contents, dup_contents, final_size);
8455 free (dup_contents);
8458 pin_contents (sec, contents);
8460 sec->size = final_size;
8464 release_internal_relocs (sec, internal_relocs);
8465 release_contents (sec, contents);
8471 translate_section_fixes (asection *sec)
8473 xtensa_relax_info *relax_info;
8476 relax_info = get_xtensa_relax_info (sec);
8480 for (r = relax_info->fix_list; r != NULL; r = r->next)
8481 if (!translate_reloc_bfd_fix (r))
8488 /* Translate a fix given the mapping in the relax info for the target
8489 section. If it has already been translated, no work is required. */
8492 translate_reloc_bfd_fix (reloc_bfd_fix *fix)
8494 reloc_bfd_fix new_fix;
8496 xtensa_relax_info *relax_info;
8497 removed_literal *removed;
8498 bfd_vma new_offset, target_offset;
8500 if (fix->translated)
8503 sec = fix->target_sec;
8504 target_offset = fix->target_offset;
8506 relax_info = get_xtensa_relax_info (sec);
8509 fix->translated = TRUE;
8515 /* The fix does not need to be translated if the section cannot change. */
8516 if (!relax_info->is_relaxable_literal_section
8517 && !relax_info->is_relaxable_asm_section)
8519 fix->translated = TRUE;
8523 /* If the literal has been moved and this relocation was on an
8524 opcode, then the relocation should move to the new literal
8525 location. Otherwise, the relocation should move within the
8529 if (is_operand_relocation (fix->src_type))
8531 /* Check if the original relocation is against a literal being
8533 removed = find_removed_literal (&relax_info->removed_list,
8541 /* The fact that there is still a relocation to this literal indicates
8542 that the literal is being coalesced, not simply removed. */
8543 BFD_ASSERT (removed->to.abfd != NULL);
8545 /* This was moved to some other address (possibly another section). */
8546 new_sec = r_reloc_get_section (&removed->to);
8550 relax_info = get_xtensa_relax_info (sec);
8552 (!relax_info->is_relaxable_literal_section
8553 && !relax_info->is_relaxable_asm_section))
8555 target_offset = removed->to.target_offset;
8556 new_fix.target_sec = new_sec;
8557 new_fix.target_offset = target_offset;
8558 new_fix.translated = TRUE;
8563 target_offset = removed->to.target_offset;
8564 new_fix.target_sec = new_sec;
8567 /* The target address may have been moved within its section. */
8568 new_offset = offset_with_removed_text (&relax_info->action_list,
8571 new_fix.target_offset = new_offset;
8572 new_fix.target_offset = new_offset;
8573 new_fix.translated = TRUE;
8579 /* Fix up a relocation to take account of removed literals. */
8582 translate_reloc (const r_reloc *orig_rel, r_reloc *new_rel)
8585 xtensa_relax_info *relax_info;
8586 removed_literal *removed;
8587 bfd_vma new_offset, target_offset, removed_bytes;
8589 *new_rel = *orig_rel;
8591 if (!r_reloc_is_defined (orig_rel))
8593 sec = r_reloc_get_section (orig_rel);
8595 relax_info = get_xtensa_relax_info (sec);
8596 BFD_ASSERT (relax_info);
8598 if (!relax_info->is_relaxable_literal_section
8599 && !relax_info->is_relaxable_asm_section)
8602 target_offset = orig_rel->target_offset;
8605 if (is_operand_relocation (ELF32_R_TYPE (orig_rel->rela.r_info)))
8607 /* Check if the original relocation is against a literal being
8609 removed = find_removed_literal (&relax_info->removed_list,
8612 if (removed && removed->to.abfd)
8616 /* The fact that there is still a relocation to this literal indicates
8617 that the literal is being coalesced, not simply removed. */
8618 BFD_ASSERT (removed->to.abfd != NULL);
8620 /* This was moved to some other address
8621 (possibly in another section). */
8622 *new_rel = removed->to;
8623 new_sec = r_reloc_get_section (new_rel);
8627 relax_info = get_xtensa_relax_info (sec);
8629 || (!relax_info->is_relaxable_literal_section
8630 && !relax_info->is_relaxable_asm_section))
8633 target_offset = new_rel->target_offset;
8636 /* ...and the target address may have been moved within its section. */
8637 new_offset = offset_with_removed_text (&relax_info->action_list,
8640 /* Modify the offset and addend. */
8641 removed_bytes = target_offset - new_offset;
8642 new_rel->target_offset = new_offset;
8643 new_rel->rela.r_addend -= removed_bytes;
8647 /* For dynamic links, there may be a dynamic relocation for each
8648 literal. The number of dynamic relocations must be computed in
8649 size_dynamic_sections, which occurs before relaxation. When a
8650 literal is removed, this function checks if there is a corresponding
8651 dynamic relocation and shrinks the size of the appropriate dynamic
8652 relocation section accordingly. At this point, the contents of the
8653 dynamic relocation sections have not yet been filled in, so there's
8654 nothing else that needs to be done. */
8657 shrink_dynamic_reloc_sections (struct bfd_link_info *info,
8659 asection *input_section,
8660 Elf_Internal_Rela *rel)
8662 struct elf_xtensa_link_hash_table *htab;
8663 Elf_Internal_Shdr *symtab_hdr;
8664 struct elf_link_hash_entry **sym_hashes;
8665 unsigned long r_symndx;
8667 struct elf_link_hash_entry *h;
8668 bfd_boolean dynamic_symbol;
8670 htab = elf_xtensa_hash_table (info);
8671 symtab_hdr = &elf_tdata (abfd)->symtab_hdr;
8672 sym_hashes = elf_sym_hashes (abfd);
8674 r_type = ELF32_R_TYPE (rel->r_info);
8675 r_symndx = ELF32_R_SYM (rel->r_info);
8677 if (r_symndx < symtab_hdr->sh_info)
8680 h = sym_hashes[r_symndx - symtab_hdr->sh_info];
8682 dynamic_symbol = elf_xtensa_dynamic_symbol_p (h, info);
8684 if ((r_type == R_XTENSA_32 || r_type == R_XTENSA_PLT)
8685 && (input_section->flags & SEC_ALLOC) != 0
8686 && (dynamic_symbol || info->shared))
8689 bfd_boolean is_plt = FALSE;
8691 if (dynamic_symbol && r_type == R_XTENSA_PLT)
8693 srel = htab->srelplt;
8697 srel = htab->srelgot;
8699 /* Reduce size of the .rela.* section by one reloc. */
8700 BFD_ASSERT (srel != NULL);
8701 BFD_ASSERT (srel->size >= sizeof (Elf32_External_Rela));
8702 srel->size -= sizeof (Elf32_External_Rela);
8706 asection *splt, *sgotplt, *srelgot;
8707 int reloc_index, chunk;
8709 /* Find the PLT reloc index of the entry being removed. This
8710 is computed from the size of ".rela.plt". It is needed to
8711 figure out which PLT chunk to resize. Usually "last index
8712 = size - 1" since the index starts at zero, but in this
8713 context, the size has just been decremented so there's no
8714 need to subtract one. */
8715 reloc_index = srel->size / sizeof (Elf32_External_Rela);
8717 chunk = reloc_index / PLT_ENTRIES_PER_CHUNK;
8718 splt = elf_xtensa_get_plt_section (info, chunk);
8719 sgotplt = elf_xtensa_get_gotplt_section (info, chunk);
8720 BFD_ASSERT (splt != NULL && sgotplt != NULL);
8722 /* Check if an entire PLT chunk has just been eliminated. */
8723 if (reloc_index % PLT_ENTRIES_PER_CHUNK == 0)
8725 /* The two magic GOT entries for that chunk can go away. */
8726 srelgot = htab->srelgot;
8727 BFD_ASSERT (srelgot != NULL);
8728 srelgot->reloc_count -= 2;
8729 srelgot->size -= 2 * sizeof (Elf32_External_Rela);
8732 /* There should be only one entry left (and it will be
8734 BFD_ASSERT (sgotplt->size == 4);
8735 BFD_ASSERT (splt->size == PLT_ENTRY_SIZE);
8738 BFD_ASSERT (sgotplt->size >= 4);
8739 BFD_ASSERT (splt->size >= PLT_ENTRY_SIZE);
8742 splt->size -= PLT_ENTRY_SIZE;
8748 /* Take an r_rel and move it to another section. This usually
8749 requires extending the interal_relocation array and pinning it. If
8750 the original r_rel is from the same BFD, we can complete this here.
8751 Otherwise, we add a fix record to let the final link fix the
8752 appropriate address. Contents and internal relocations for the
8753 section must be pinned after calling this routine. */
8756 move_literal (bfd *abfd,
8757 struct bfd_link_info *link_info,
8761 xtensa_relax_info *relax_info,
8762 Elf_Internal_Rela **internal_relocs_p,
8763 const literal_value *lit)
8765 Elf_Internal_Rela *new_relocs = NULL;
8766 size_t new_relocs_count = 0;
8767 Elf_Internal_Rela this_rela;
8768 const r_reloc *r_rel;
8770 r_rel = &lit->r_rel;
8771 BFD_ASSERT (elf_section_data (sec)->relocs == *internal_relocs_p);
8773 if (r_reloc_is_const (r_rel))
8774 bfd_put_32 (abfd, lit->value, contents + offset);
8779 asection *target_sec;
8783 r_type = ELF32_R_TYPE (r_rel->rela.r_info);
8784 target_sec = r_reloc_get_section (r_rel);
8786 /* This is the difficult case. We have to create a fix up. */
8787 this_rela.r_offset = offset;
8788 this_rela.r_info = ELF32_R_INFO (0, r_type);
8789 this_rela.r_addend =
8790 r_rel->target_offset - r_reloc_get_target_offset (r_rel);
8791 bfd_put_32 (abfd, lit->value, contents + offset);
8793 /* Currently, we cannot move relocations during a relocatable link. */
8794 BFD_ASSERT (!link_info->relocatable);
8795 fix = reloc_bfd_fix_init (sec, offset, r_type,
8796 r_reloc_get_section (r_rel),
8797 r_rel->target_offset + r_rel->virtual_offset,
8799 /* We also need to mark that relocations are needed here. */
8800 sec->flags |= SEC_RELOC;
8802 translate_reloc_bfd_fix (fix);
8803 /* This fix has not yet been translated. */
8806 /* Add the relocation. If we have already allocated our own
8807 space for the relocations and we have room for more, then use
8808 it. Otherwise, allocate new space and move the literals. */
8809 insert_at = sec->reloc_count;
8810 for (i = 0; i < sec->reloc_count; ++i)
8812 if (this_rela.r_offset < (*internal_relocs_p)[i].r_offset)
8819 if (*internal_relocs_p != relax_info->allocated_relocs
8820 || sec->reloc_count + 1 > relax_info->allocated_relocs_count)
8822 BFD_ASSERT (relax_info->allocated_relocs == NULL
8823 || sec->reloc_count == relax_info->relocs_count);
8825 if (relax_info->allocated_relocs_count == 0)
8826 new_relocs_count = (sec->reloc_count + 2) * 2;
8828 new_relocs_count = (relax_info->allocated_relocs_count + 2) * 2;
8830 new_relocs = (Elf_Internal_Rela *)
8831 bfd_zmalloc (sizeof (Elf_Internal_Rela) * (new_relocs_count));
8835 /* We could handle this more quickly by finding the split point. */
8837 memcpy (new_relocs, *internal_relocs_p,
8838 insert_at * sizeof (Elf_Internal_Rela));
8840 new_relocs[insert_at] = this_rela;
8842 if (insert_at != sec->reloc_count)
8843 memcpy (new_relocs + insert_at + 1,
8844 (*internal_relocs_p) + insert_at,
8845 (sec->reloc_count - insert_at)
8846 * sizeof (Elf_Internal_Rela));
8848 if (*internal_relocs_p != relax_info->allocated_relocs)
8850 /* The first time we re-allocate, we can only free the
8851 old relocs if they were allocated with bfd_malloc.
8852 This is not true when keep_memory is in effect. */
8853 if (!link_info->keep_memory)
8854 free (*internal_relocs_p);
8857 free (*internal_relocs_p);
8858 relax_info->allocated_relocs = new_relocs;
8859 relax_info->allocated_relocs_count = new_relocs_count;
8860 elf_section_data (sec)->relocs = new_relocs;
8862 relax_info->relocs_count = sec->reloc_count;
8863 *internal_relocs_p = new_relocs;
8867 if (insert_at != sec->reloc_count)
8870 for (idx = sec->reloc_count; idx > insert_at; idx--)
8871 (*internal_relocs_p)[idx] = (*internal_relocs_p)[idx-1];
8873 (*internal_relocs_p)[insert_at] = this_rela;
8875 if (relax_info->allocated_relocs)
8876 relax_info->relocs_count = sec->reloc_count;
8883 /* This is similar to relax_section except that when a target is moved,
8884 we shift addresses up. We also need to modify the size. This
8885 algorithm does NOT allow for relocations into the middle of the
8886 property sections. */
8889 relax_property_section (bfd *abfd,
8891 struct bfd_link_info *link_info)
8893 Elf_Internal_Rela *internal_relocs;
8896 bfd_boolean ok = TRUE;
8897 bfd_boolean is_full_prop_section;
8898 size_t last_zfill_target_offset = 0;
8899 asection *last_zfill_target_sec = NULL;
8900 bfd_size_type sec_size;
8901 bfd_size_type entry_size;
8903 sec_size = bfd_get_section_limit (abfd, sec);
8904 internal_relocs = retrieve_internal_relocs (abfd, sec,
8905 link_info->keep_memory);
8906 contents = retrieve_contents (abfd, sec, link_info->keep_memory);
8907 if (contents == NULL && sec_size != 0)
8913 is_full_prop_section = xtensa_is_proptable_section (sec);
8914 if (is_full_prop_section)
8919 if (internal_relocs)
8921 for (i = 0; i < sec->reloc_count; i++)
8923 Elf_Internal_Rela *irel;
8924 xtensa_relax_info *target_relax_info;
8926 asection *target_sec;
8928 bfd_byte *size_p, *flags_p;
8930 /* Locally change the source address.
8931 Translate the target to the new target address.
8932 If it points to this section and has been removed, MOVE IT.
8933 Also, don't forget to modify the associated SIZE at
8936 irel = &internal_relocs[i];
8937 r_type = ELF32_R_TYPE (irel->r_info);
8938 if (r_type == R_XTENSA_NONE)
8941 /* Find the literal value. */
8942 r_reloc_init (&val.r_rel, abfd, irel, contents, sec_size);
8943 size_p = &contents[irel->r_offset + 4];
8945 if (is_full_prop_section)
8946 flags_p = &contents[irel->r_offset + 8];
8947 BFD_ASSERT (irel->r_offset + entry_size <= sec_size);
8949 target_sec = r_reloc_get_section (&val.r_rel);
8950 target_relax_info = get_xtensa_relax_info (target_sec);
8952 if (target_relax_info
8953 && (target_relax_info->is_relaxable_literal_section
8954 || target_relax_info->is_relaxable_asm_section ))
8956 /* Translate the relocation's destination. */
8957 bfd_vma old_offset = val.r_rel.target_offset;
8959 long old_size, new_size;
8960 text_action *act = target_relax_info->action_list.head;
8961 new_offset = old_offset -
8962 removed_by_actions (&act, old_offset, FALSE);
8964 /* Assert that we are not out of bounds. */
8965 old_size = bfd_get_32 (abfd, size_p);
8966 new_size = old_size;
8970 /* Only the first zero-sized unreachable entry is
8971 allowed to expand. In this case the new offset
8972 should be the offset before the fill and the new
8973 size is the expansion size. For other zero-sized
8974 entries the resulting size should be zero with an
8975 offset before or after the fill address depending
8976 on whether the expanding unreachable entry
8978 if (last_zfill_target_sec == 0
8979 || last_zfill_target_sec != target_sec
8980 || last_zfill_target_offset != old_offset)
8982 bfd_vma new_end_offset = new_offset;
8984 /* Recompute the new_offset, but this time don't
8985 include any fill inserted by relaxation. */
8986 act = target_relax_info->action_list.head;
8987 new_offset = old_offset -
8988 removed_by_actions (&act, old_offset, TRUE);
8990 /* If it is not unreachable and we have not yet
8991 seen an unreachable at this address, place it
8992 before the fill address. */
8993 if (flags_p && (bfd_get_32 (abfd, flags_p)
8994 & XTENSA_PROP_UNREACHABLE) != 0)
8996 new_size = new_end_offset - new_offset;
8998 last_zfill_target_sec = target_sec;
8999 last_zfill_target_offset = old_offset;
9005 removed_by_actions (&act, old_offset + old_size, TRUE);
9007 if (new_size != old_size)
9009 bfd_put_32 (abfd, new_size, size_p);
9010 pin_contents (sec, contents);
9013 if (new_offset != old_offset)
9015 bfd_vma diff = new_offset - old_offset;
9016 irel->r_addend += diff;
9017 pin_internal_relocs (sec, internal_relocs);
9023 /* Combine adjacent property table entries. This is also done in
9024 finish_dynamic_sections() but at that point it's too late to
9025 reclaim the space in the output section, so we do this twice. */
9027 if (internal_relocs && (!link_info->relocatable
9028 || xtensa_is_littable_section (sec)))
9030 Elf_Internal_Rela *last_irel = NULL;
9031 Elf_Internal_Rela *irel, *next_rel, *rel_end;
9032 int removed_bytes = 0;
9034 bfd_vma section_size;
9035 flagword predef_flags;
9037 predef_flags = xtensa_get_property_predef_flags (sec);
9039 /* Walk over memory and relocations at the same time.
9040 This REQUIRES that the internal_relocs be sorted by offset. */
9041 qsort (internal_relocs, sec->reloc_count, sizeof (Elf_Internal_Rela),
9042 internal_reloc_compare);
9044 pin_internal_relocs (sec, internal_relocs);
9045 pin_contents (sec, contents);
9047 next_rel = internal_relocs;
9048 rel_end = internal_relocs + sec->reloc_count;
9050 section_size = sec->size;
9051 BFD_ASSERT (section_size % entry_size == 0);
9053 for (offset = 0; offset < section_size; offset += entry_size)
9055 Elf_Internal_Rela *offset_rel, *extra_rel;
9056 bfd_vma bytes_to_remove, size, actual_offset;
9057 bfd_boolean remove_this_rel;
9060 /* Find the first relocation for the entry at the current offset.
9061 Adjust the offsets of any extra relocations for the previous
9066 for (irel = next_rel; irel < rel_end; irel++)
9068 if ((irel->r_offset == offset
9069 && ELF32_R_TYPE (irel->r_info) != R_XTENSA_NONE)
9070 || irel->r_offset > offset)
9075 irel->r_offset -= removed_bytes;
9079 /* Find the next relocation (if there are any left). */
9083 for (irel = offset_rel + 1; irel < rel_end; irel++)
9085 if (ELF32_R_TYPE (irel->r_info) != R_XTENSA_NONE)
9093 /* Check if there are relocations on the current entry. There
9094 should usually be a relocation on the offset field. If there
9095 are relocations on the size or flags, then we can't optimize
9096 this entry. Also, find the next relocation to examine on the
9100 if (offset_rel->r_offset >= offset + entry_size)
9102 next_rel = offset_rel;
9103 /* There are no relocations on the current entry, but we
9104 might still be able to remove it if the size is zero. */
9107 else if (offset_rel->r_offset > offset
9109 && extra_rel->r_offset < offset + entry_size))
9111 /* There is a relocation on the size or flags, so we can't
9112 do anything with this entry. Continue with the next. */
9113 next_rel = offset_rel;
9118 BFD_ASSERT (offset_rel->r_offset == offset);
9119 offset_rel->r_offset -= removed_bytes;
9120 next_rel = offset_rel + 1;
9126 remove_this_rel = FALSE;
9127 bytes_to_remove = 0;
9128 actual_offset = offset - removed_bytes;
9129 size = bfd_get_32 (abfd, &contents[actual_offset + 4]);
9131 if (is_full_prop_section)
9132 flags = bfd_get_32 (abfd, &contents[actual_offset + 8]);
9134 flags = predef_flags;
9137 && (flags & XTENSA_PROP_ALIGN) == 0
9138 && (flags & XTENSA_PROP_UNREACHABLE) == 0)
9140 /* Always remove entries with zero size and no alignment. */
9141 bytes_to_remove = entry_size;
9143 remove_this_rel = TRUE;
9146 && ELF32_R_TYPE (offset_rel->r_info) == R_XTENSA_32)
9152 bfd_get_32 (abfd, &contents[last_irel->r_offset + 4]);
9153 bfd_vma old_address =
9154 (last_irel->r_addend
9155 + bfd_get_32 (abfd, &contents[last_irel->r_offset]));
9156 bfd_vma new_address =
9157 (offset_rel->r_addend
9158 + bfd_get_32 (abfd, &contents[actual_offset]));
9159 if (is_full_prop_section)
9160 old_flags = bfd_get_32
9161 (abfd, &contents[last_irel->r_offset + 8]);
9163 old_flags = predef_flags;
9165 if ((ELF32_R_SYM (offset_rel->r_info)
9166 == ELF32_R_SYM (last_irel->r_info))
9167 && old_address + old_size == new_address
9168 && old_flags == flags
9169 && (old_flags & XTENSA_PROP_INSN_BRANCH_TARGET) == 0
9170 && (old_flags & XTENSA_PROP_INSN_LOOP_TARGET) == 0)
9172 /* Fix the old size. */
9173 bfd_put_32 (abfd, old_size + size,
9174 &contents[last_irel->r_offset + 4]);
9175 bytes_to_remove = entry_size;
9176 remove_this_rel = TRUE;
9179 last_irel = offset_rel;
9182 last_irel = offset_rel;
9185 if (remove_this_rel)
9187 offset_rel->r_info = ELF32_R_INFO (0, R_XTENSA_NONE);
9188 /* In case this is the last entry, move the relocation offset
9189 to the previous entry, if there is one. */
9190 if (offset_rel->r_offset >= bytes_to_remove)
9191 offset_rel->r_offset -= bytes_to_remove;
9193 offset_rel->r_offset = 0;
9196 if (bytes_to_remove != 0)
9198 removed_bytes += bytes_to_remove;
9199 if (offset + bytes_to_remove < section_size)
9200 memmove (&contents[actual_offset],
9201 &contents[actual_offset + bytes_to_remove],
9202 section_size - offset - bytes_to_remove);
9208 /* Fix up any extra relocations on the last entry. */
9209 for (irel = next_rel; irel < rel_end; irel++)
9210 irel->r_offset -= removed_bytes;
9212 /* Clear the removed bytes. */
9213 memset (&contents[section_size - removed_bytes], 0, removed_bytes);
9215 sec->size = section_size - removed_bytes;
9217 if (xtensa_is_littable_section (sec))
9219 asection *sgotloc = elf_xtensa_hash_table (link_info)->sgotloc;
9221 sgotloc->size -= removed_bytes;
9227 release_internal_relocs (sec, internal_relocs);
9228 release_contents (sec, contents);
9233 /* Third relaxation pass. */
9235 /* Change symbol values to account for removed literals. */
9238 relax_section_symbols (bfd *abfd, asection *sec)
9240 xtensa_relax_info *relax_info;
9241 unsigned int sec_shndx;
9242 Elf_Internal_Shdr *symtab_hdr;
9243 Elf_Internal_Sym *isymbuf;
9244 unsigned i, num_syms, num_locals;
9246 relax_info = get_xtensa_relax_info (sec);
9247 BFD_ASSERT (relax_info);
9249 if (!relax_info->is_relaxable_literal_section
9250 && !relax_info->is_relaxable_asm_section)
9253 sec_shndx = _bfd_elf_section_from_bfd_section (abfd, sec);
9255 symtab_hdr = &elf_tdata (abfd)->symtab_hdr;
9256 isymbuf = retrieve_local_syms (abfd);
9258 num_syms = symtab_hdr->sh_size / sizeof (Elf32_External_Sym);
9259 num_locals = symtab_hdr->sh_info;
9261 /* Adjust the local symbols defined in this section. */
9262 for (i = 0; i < num_locals; i++)
9264 Elf_Internal_Sym *isym = &isymbuf[i];
9266 if (isym->st_shndx == sec_shndx)
9268 text_action *act = relax_info->action_list.head;
9269 bfd_vma orig_addr = isym->st_value;
9271 isym->st_value -= removed_by_actions (&act, orig_addr, FALSE);
9273 if (ELF32_ST_TYPE (isym->st_info) == STT_FUNC)
9275 removed_by_actions (&act, orig_addr + isym->st_size, FALSE);
9279 /* Now adjust the global symbols defined in this section. */
9280 for (i = 0; i < (num_syms - num_locals); i++)
9282 struct elf_link_hash_entry *sym_hash;
9284 sym_hash = elf_sym_hashes (abfd)[i];
9286 if (sym_hash->root.type == bfd_link_hash_warning)
9287 sym_hash = (struct elf_link_hash_entry *) sym_hash->root.u.i.link;
9289 if ((sym_hash->root.type == bfd_link_hash_defined
9290 || sym_hash->root.type == bfd_link_hash_defweak)
9291 && sym_hash->root.u.def.section == sec)
9293 text_action *act = relax_info->action_list.head;
9294 bfd_vma orig_addr = sym_hash->root.u.def.value;
9296 sym_hash->root.u.def.value -=
9297 removed_by_actions (&act, orig_addr, FALSE);
9299 if (sym_hash->type == STT_FUNC)
9301 removed_by_actions (&act, orig_addr + sym_hash->size, FALSE);
9309 /* "Fix" handling functions, called while performing relocations. */
9312 do_fix_for_relocatable_link (Elf_Internal_Rela *rel,
9314 asection *input_section,
9318 asection *sec, *old_sec;
9320 int r_type = ELF32_R_TYPE (rel->r_info);
9323 if (r_type == R_XTENSA_NONE)
9326 fix = get_bfd_fix (input_section, rel->r_offset, r_type);
9330 r_reloc_init (&r_rel, input_bfd, rel, contents,
9331 bfd_get_section_limit (input_bfd, input_section));
9332 old_sec = r_reloc_get_section (&r_rel);
9333 old_offset = r_rel.target_offset;
9335 if (!old_sec || !r_reloc_is_defined (&r_rel))
9337 if (r_type != R_XTENSA_ASM_EXPAND)
9339 (*_bfd_error_handler)
9340 (_("%B(%A+0x%lx): unexpected fix for %s relocation"),
9341 input_bfd, input_section, rel->r_offset,
9342 elf_howto_table[r_type].name);
9345 /* Leave it be. Resolution will happen in a later stage. */
9349 sec = fix->target_sec;
9350 rel->r_addend += ((sec->output_offset + fix->target_offset)
9351 - (old_sec->output_offset + old_offset));
9358 do_fix_for_final_link (Elf_Internal_Rela *rel,
9360 asection *input_section,
9362 bfd_vma *relocationp)
9365 int r_type = ELF32_R_TYPE (rel->r_info);
9369 if (r_type == R_XTENSA_NONE)
9372 fix = get_bfd_fix (input_section, rel->r_offset, r_type);
9376 sec = fix->target_sec;
9378 fixup_diff = rel->r_addend;
9379 if (elf_howto_table[fix->src_type].partial_inplace)
9381 bfd_vma inplace_val;
9382 BFD_ASSERT (fix->src_offset
9383 < bfd_get_section_limit (input_bfd, input_section));
9384 inplace_val = bfd_get_32 (input_bfd, &contents[fix->src_offset]);
9385 fixup_diff += inplace_val;
9388 *relocationp = (sec->output_section->vma
9389 + sec->output_offset
9390 + fix->target_offset - fixup_diff);
9394 /* Miscellaneous utility functions.... */
9397 elf_xtensa_get_plt_section (struct bfd_link_info *info, int chunk)
9399 struct elf_xtensa_link_hash_table *htab;
9405 htab = elf_xtensa_hash_table (info);
9409 dynobj = elf_hash_table (info)->dynobj;
9410 sprintf (plt_name, ".plt.%u", chunk);
9411 return bfd_get_section_by_name (dynobj, plt_name);
9416 elf_xtensa_get_gotplt_section (struct bfd_link_info *info, int chunk)
9418 struct elf_xtensa_link_hash_table *htab;
9424 htab = elf_xtensa_hash_table (info);
9425 return htab->sgotplt;
9428 dynobj = elf_hash_table (info)->dynobj;
9429 sprintf (got_name, ".got.plt.%u", chunk);
9430 return bfd_get_section_by_name (dynobj, got_name);
9434 /* Get the input section for a given symbol index.
9436 . a section symbol, return the section;
9437 . a common symbol, return the common section;
9438 . an undefined symbol, return the undefined section;
9439 . an indirect symbol, follow the links;
9440 . an absolute value, return the absolute section. */
9443 get_elf_r_symndx_section (bfd *abfd, unsigned long r_symndx)
9445 Elf_Internal_Shdr *symtab_hdr = &elf_tdata (abfd)->symtab_hdr;
9446 asection *target_sec = NULL;
9447 if (r_symndx < symtab_hdr->sh_info)
9449 Elf_Internal_Sym *isymbuf;
9450 unsigned int section_index;
9452 isymbuf = retrieve_local_syms (abfd);
9453 section_index = isymbuf[r_symndx].st_shndx;
9455 if (section_index == SHN_UNDEF)
9456 target_sec = bfd_und_section_ptr;
9457 else if (section_index > 0 && section_index < SHN_LORESERVE)
9458 target_sec = bfd_section_from_elf_index (abfd, section_index);
9459 else if (section_index == SHN_ABS)
9460 target_sec = bfd_abs_section_ptr;
9461 else if (section_index == SHN_COMMON)
9462 target_sec = bfd_com_section_ptr;
9469 unsigned long indx = r_symndx - symtab_hdr->sh_info;
9470 struct elf_link_hash_entry *h = elf_sym_hashes (abfd)[indx];
9472 while (h->root.type == bfd_link_hash_indirect
9473 || h->root.type == bfd_link_hash_warning)
9474 h = (struct elf_link_hash_entry *) h->root.u.i.link;
9476 switch (h->root.type)
9478 case bfd_link_hash_defined:
9479 case bfd_link_hash_defweak:
9480 target_sec = h->root.u.def.section;
9482 case bfd_link_hash_common:
9483 target_sec = bfd_com_section_ptr;
9485 case bfd_link_hash_undefined:
9486 case bfd_link_hash_undefweak:
9487 target_sec = bfd_und_section_ptr;
9489 default: /* New indirect warning. */
9490 target_sec = bfd_und_section_ptr;
9498 static struct elf_link_hash_entry *
9499 get_elf_r_symndx_hash_entry (bfd *abfd, unsigned long r_symndx)
9502 struct elf_link_hash_entry *h;
9503 Elf_Internal_Shdr *symtab_hdr = &elf_tdata (abfd)->symtab_hdr;
9505 if (r_symndx < symtab_hdr->sh_info)
9508 indx = r_symndx - symtab_hdr->sh_info;
9509 h = elf_sym_hashes (abfd)[indx];
9510 while (h->root.type == bfd_link_hash_indirect
9511 || h->root.type == bfd_link_hash_warning)
9512 h = (struct elf_link_hash_entry *) h->root.u.i.link;
9517 /* Get the section-relative offset for a symbol number. */
9520 get_elf_r_symndx_offset (bfd *abfd, unsigned long r_symndx)
9522 Elf_Internal_Shdr *symtab_hdr = &elf_tdata (abfd)->symtab_hdr;
9525 if (r_symndx < symtab_hdr->sh_info)
9527 Elf_Internal_Sym *isymbuf;
9528 isymbuf = retrieve_local_syms (abfd);
9529 offset = isymbuf[r_symndx].st_value;
9533 unsigned long indx = r_symndx - symtab_hdr->sh_info;
9534 struct elf_link_hash_entry *h =
9535 elf_sym_hashes (abfd)[indx];
9537 while (h->root.type == bfd_link_hash_indirect
9538 || h->root.type == bfd_link_hash_warning)
9539 h = (struct elf_link_hash_entry *) h->root.u.i.link;
9540 if (h->root.type == bfd_link_hash_defined
9541 || h->root.type == bfd_link_hash_defweak)
9542 offset = h->root.u.def.value;
9549 is_reloc_sym_weak (bfd *abfd, Elf_Internal_Rela *rel)
9551 unsigned long r_symndx = ELF32_R_SYM (rel->r_info);
9552 struct elf_link_hash_entry *h;
9554 h = get_elf_r_symndx_hash_entry (abfd, r_symndx);
9555 if (h && h->root.type == bfd_link_hash_defweak)
9562 pcrel_reloc_fits (xtensa_opcode opc,
9564 bfd_vma self_address,
9565 bfd_vma dest_address)
9567 xtensa_isa isa = xtensa_default_isa;
9568 uint32 valp = dest_address;
9569 if (xtensa_operand_do_reloc (isa, opc, opnd, &valp, self_address)
9570 || xtensa_operand_encode (isa, opc, opnd, &valp))
9577 xtensa_is_property_section (asection *sec)
9579 if (xtensa_is_insntable_section (sec)
9580 || xtensa_is_littable_section (sec)
9581 || xtensa_is_proptable_section (sec))
9589 xtensa_is_insntable_section (asection *sec)
9591 if (CONST_STRNEQ (sec->name, XTENSA_INSN_SEC_NAME)
9592 || CONST_STRNEQ (sec->name, ".gnu.linkonce.x."))
9600 xtensa_is_littable_section (asection *sec)
9602 if (CONST_STRNEQ (sec->name, XTENSA_LIT_SEC_NAME)
9603 || CONST_STRNEQ (sec->name, ".gnu.linkonce.p."))
9611 xtensa_is_proptable_section (asection *sec)
9613 if (CONST_STRNEQ (sec->name, XTENSA_PROP_SEC_NAME)
9614 || CONST_STRNEQ (sec->name, ".gnu.linkonce.prop."))
9622 internal_reloc_compare (const void *ap, const void *bp)
9624 const Elf_Internal_Rela *a = (const Elf_Internal_Rela *) ap;
9625 const Elf_Internal_Rela *b = (const Elf_Internal_Rela *) bp;
9627 if (a->r_offset != b->r_offset)
9628 return (a->r_offset - b->r_offset);
9630 /* We don't need to sort on these criteria for correctness,
9631 but enforcing a more strict ordering prevents unstable qsort
9632 from behaving differently with different implementations.
9633 Without the code below we get correct but different results
9634 on Solaris 2.7 and 2.8. We would like to always produce the
9635 same results no matter the host. */
9637 if (a->r_info != b->r_info)
9638 return (a->r_info - b->r_info);
9640 return (a->r_addend - b->r_addend);
9645 internal_reloc_matches (const void *ap, const void *bp)
9647 const Elf_Internal_Rela *a = (const Elf_Internal_Rela *) ap;
9648 const Elf_Internal_Rela *b = (const Elf_Internal_Rela *) bp;
9650 /* Check if one entry overlaps with the other; this shouldn't happen
9651 except when searching for a match. */
9652 return (a->r_offset - b->r_offset);
9656 /* Predicate function used to look up a section in a particular group. */
9659 match_section_group (bfd *abfd ATTRIBUTE_UNUSED, asection *sec, void *inf)
9661 const char *gname = inf;
9662 const char *group_name = elf_group_name (sec);
9664 return (group_name == gname
9665 || (group_name != NULL
9667 && strcmp (group_name, gname) == 0));
9671 static int linkonce_len = sizeof (".gnu.linkonce.") - 1;
9674 xtensa_get_property_section (asection *sec, const char *base_name)
9676 const char *suffix, *group_name;
9677 char *prop_sec_name;
9680 group_name = elf_group_name (sec);
9683 suffix = strrchr (sec->name, '.');
9684 if (suffix == sec->name)
9686 prop_sec_name = (char *) bfd_malloc (strlen (base_name) + 1
9687 + (suffix ? strlen (suffix) : 0));
9688 strcpy (prop_sec_name, base_name);
9690 strcat (prop_sec_name, suffix);
9692 else if (strncmp (sec->name, ".gnu.linkonce.", linkonce_len) == 0)
9694 char *linkonce_kind = 0;
9696 if (strcmp (base_name, XTENSA_INSN_SEC_NAME) == 0)
9697 linkonce_kind = "x.";
9698 else if (strcmp (base_name, XTENSA_LIT_SEC_NAME) == 0)
9699 linkonce_kind = "p.";
9700 else if (strcmp (base_name, XTENSA_PROP_SEC_NAME) == 0)
9701 linkonce_kind = "prop.";
9705 prop_sec_name = (char *) bfd_malloc (strlen (sec->name)
9706 + strlen (linkonce_kind) + 1);
9707 memcpy (prop_sec_name, ".gnu.linkonce.", linkonce_len);
9708 strcpy (prop_sec_name + linkonce_len, linkonce_kind);
9710 suffix = sec->name + linkonce_len;
9711 /* For backward compatibility, replace "t." instead of inserting
9712 the new linkonce_kind (but not for "prop" sections). */
9713 if (CONST_STRNEQ (suffix, "t.") && linkonce_kind[1] == '.')
9715 strcat (prop_sec_name + linkonce_len, suffix);
9718 prop_sec_name = strdup (base_name);
9720 /* Check if the section already exists. */
9721 prop_sec = bfd_get_section_by_name_if (sec->owner, prop_sec_name,
9722 match_section_group,
9723 (void *) group_name);
9724 /* If not, create it. */
9727 flagword flags = (SEC_RELOC | SEC_HAS_CONTENTS | SEC_READONLY);
9728 flags |= (bfd_get_section_flags (sec->owner, sec)
9729 & (SEC_LINK_ONCE | SEC_LINK_DUPLICATES));
9731 prop_sec = bfd_make_section_anyway_with_flags
9732 (sec->owner, strdup (prop_sec_name), flags);
9736 elf_group_name (prop_sec) = group_name;
9739 free (prop_sec_name);
9745 xtensa_get_property_predef_flags (asection *sec)
9747 if (xtensa_is_insntable_section (sec))
9748 return (XTENSA_PROP_INSN
9749 | XTENSA_PROP_NO_TRANSFORM
9750 | XTENSA_PROP_INSN_NO_REORDER);
9752 if (xtensa_is_littable_section (sec))
9753 return (XTENSA_PROP_LITERAL
9754 | XTENSA_PROP_NO_TRANSFORM
9755 | XTENSA_PROP_INSN_NO_REORDER);
9761 /* Other functions called directly by the linker. */
9764 xtensa_callback_required_dependence (bfd *abfd,
9766 struct bfd_link_info *link_info,
9767 deps_callback_t callback,
9770 Elf_Internal_Rela *internal_relocs;
9773 bfd_boolean ok = TRUE;
9774 bfd_size_type sec_size;
9776 sec_size = bfd_get_section_limit (abfd, sec);
9778 /* ".plt*" sections have no explicit relocations but they contain L32R
9779 instructions that reference the corresponding ".got.plt*" sections. */
9780 if ((sec->flags & SEC_LINKER_CREATED) != 0
9781 && CONST_STRNEQ (sec->name, ".plt"))
9785 /* Find the corresponding ".got.plt*" section. */
9786 if (sec->name[4] == '\0')
9787 sgotplt = bfd_get_section_by_name (sec->owner, ".got.plt");
9793 BFD_ASSERT (sec->name[4] == '.');
9794 chunk = strtol (&sec->name[5], NULL, 10);
9796 sprintf (got_name, ".got.plt.%u", chunk);
9797 sgotplt = bfd_get_section_by_name (sec->owner, got_name);
9799 BFD_ASSERT (sgotplt);
9801 /* Assume worst-case offsets: L32R at the very end of the ".plt"
9802 section referencing a literal at the very beginning of
9803 ".got.plt". This is very close to the real dependence, anyway. */
9804 (*callback) (sec, sec_size, sgotplt, 0, closure);
9807 /* Only ELF files are supported for Xtensa. Check here to avoid a segfault
9808 when building uclibc, which runs "ld -b binary /dev/null". */
9809 if (bfd_get_flavour (abfd) != bfd_target_elf_flavour)
9812 internal_relocs = retrieve_internal_relocs (abfd, sec,
9813 link_info->keep_memory);
9814 if (internal_relocs == NULL
9815 || sec->reloc_count == 0)
9818 /* Cache the contents for the duration of this scan. */
9819 contents = retrieve_contents (abfd, sec, link_info->keep_memory);
9820 if (contents == NULL && sec_size != 0)
9826 if (!xtensa_default_isa)
9827 xtensa_default_isa = xtensa_isa_init (0, 0);
9829 for (i = 0; i < sec->reloc_count; i++)
9831 Elf_Internal_Rela *irel = &internal_relocs[i];
9832 if (is_l32r_relocation (abfd, sec, contents, irel))
9835 asection *target_sec;
9836 bfd_vma target_offset;
9838 r_reloc_init (&l32r_rel, abfd, irel, contents, sec_size);
9841 /* L32Rs must be local to the input file. */
9842 if (r_reloc_is_defined (&l32r_rel))
9844 target_sec = r_reloc_get_section (&l32r_rel);
9845 target_offset = l32r_rel.target_offset;
9847 (*callback) (sec, irel->r_offset, target_sec, target_offset,
9853 release_internal_relocs (sec, internal_relocs);
9854 release_contents (sec, contents);
9858 /* The default literal sections should always be marked as "code" (i.e.,
9859 SHF_EXECINSTR). This is particularly important for the Linux kernel
9860 module loader so that the literals are not placed after the text. */
9861 static const struct bfd_elf_special_section elf_xtensa_special_sections[] =
9863 { STRING_COMMA_LEN (".fini.literal"), 0, SHT_PROGBITS, SHF_ALLOC + SHF_EXECINSTR },
9864 { STRING_COMMA_LEN (".init.literal"), 0, SHT_PROGBITS, SHF_ALLOC + SHF_EXECINSTR },
9865 { STRING_COMMA_LEN (".literal"), 0, SHT_PROGBITS, SHF_ALLOC + SHF_EXECINSTR },
9866 { STRING_COMMA_LEN (".xtensa.info"), 0, SHT_NOTE, 0 },
9867 { NULL, 0, 0, 0, 0 }
9871 #define TARGET_LITTLE_SYM bfd_elf32_xtensa_le_vec
9872 #define TARGET_LITTLE_NAME "elf32-xtensa-le"
9873 #define TARGET_BIG_SYM bfd_elf32_xtensa_be_vec
9874 #define TARGET_BIG_NAME "elf32-xtensa-be"
9875 #define ELF_ARCH bfd_arch_xtensa
9877 #define ELF_MACHINE_CODE EM_XTENSA
9878 #define ELF_MACHINE_ALT1 EM_XTENSA_OLD
9881 #define ELF_MAXPAGESIZE (1 << XCHAL_MMU_MIN_PTE_PAGE_SIZE)
9882 #else /* !XCHAL_HAVE_MMU */
9883 #define ELF_MAXPAGESIZE 1
9884 #endif /* !XCHAL_HAVE_MMU */
9885 #endif /* ELF_ARCH */
9887 #define elf_backend_can_gc_sections 1
9888 #define elf_backend_can_refcount 1
9889 #define elf_backend_plt_readonly 1
9890 #define elf_backend_got_header_size 4
9891 #define elf_backend_want_dynbss 0
9892 #define elf_backend_want_got_plt 1
9894 #define elf_info_to_howto elf_xtensa_info_to_howto_rela
9896 #define bfd_elf32_bfd_merge_private_bfd_data elf_xtensa_merge_private_bfd_data
9897 #define bfd_elf32_new_section_hook elf_xtensa_new_section_hook
9898 #define bfd_elf32_bfd_print_private_bfd_data elf_xtensa_print_private_bfd_data
9899 #define bfd_elf32_bfd_relax_section elf_xtensa_relax_section
9900 #define bfd_elf32_bfd_reloc_type_lookup elf_xtensa_reloc_type_lookup
9901 #define bfd_elf32_bfd_reloc_name_lookup \
9902 elf_xtensa_reloc_name_lookup
9903 #define bfd_elf32_bfd_set_private_flags elf_xtensa_set_private_flags
9904 #define bfd_elf32_bfd_link_hash_table_create elf_xtensa_link_hash_table_create
9906 #define elf_backend_adjust_dynamic_symbol elf_xtensa_adjust_dynamic_symbol
9907 #define elf_backend_check_relocs elf_xtensa_check_relocs
9908 #define elf_backend_create_dynamic_sections elf_xtensa_create_dynamic_sections
9909 #define elf_backend_discard_info elf_xtensa_discard_info
9910 #define elf_backend_ignore_discarded_relocs elf_xtensa_ignore_discarded_relocs
9911 #define elf_backend_final_write_processing elf_xtensa_final_write_processing
9912 #define elf_backend_finish_dynamic_sections elf_xtensa_finish_dynamic_sections
9913 #define elf_backend_finish_dynamic_symbol elf_xtensa_finish_dynamic_symbol
9914 #define elf_backend_gc_mark_hook elf_xtensa_gc_mark_hook
9915 #define elf_backend_gc_sweep_hook elf_xtensa_gc_sweep_hook
9916 #define elf_backend_grok_prstatus elf_xtensa_grok_prstatus
9917 #define elf_backend_grok_psinfo elf_xtensa_grok_psinfo
9918 #define elf_backend_hide_symbol elf_xtensa_hide_symbol
9919 #define elf_backend_object_p elf_xtensa_object_p
9920 #define elf_backend_reloc_type_class elf_xtensa_reloc_type_class
9921 #define elf_backend_relocate_section elf_xtensa_relocate_section
9922 #define elf_backend_size_dynamic_sections elf_xtensa_size_dynamic_sections
9923 #define elf_backend_omit_section_dynsym \
9924 ((bfd_boolean (*) (bfd *, struct bfd_link_info *, asection *)) bfd_true)
9925 #define elf_backend_special_sections elf_xtensa_special_sections
9926 #define elf_backend_action_discarded elf_xtensa_action_discarded
9928 #include "elf32-target.h"