Commit | Line | Data |
---|---|---|
252b5132 RH |
1 | /* 32-bit ELF support for ARM |
2 | Copyright 1998, 1999 Free Software Foundation, Inc. | |
3 | ||
4 | This file is part of BFD, the Binary File Descriptor library. | |
5 | ||
6 | This program is free software; you can redistribute it and/or modify | |
7 | it under the terms of the GNU General Public License as published by | |
8 | the Free Software Foundation; either version 2 of the License, or | |
9 | (at your option) any later version. | |
10 | ||
11 | This program is distributed in the hope that it will be useful, | |
12 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
13 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
14 | GNU General Public License for more details. | |
15 | ||
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., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */ | |
19 | ||
20 | ||
21 | typedef unsigned long int insn32; | |
22 | typedef unsigned short int insn16; | |
23 | ||
24 | static boolean elf32_arm_set_private_flags | |
25 | PARAMS ((bfd *, flagword)); | |
26 | static boolean elf32_arm_copy_private_bfd_data | |
27 | PARAMS ((bfd *, bfd *)); | |
28 | static boolean elf32_arm_merge_private_bfd_data | |
29 | PARAMS ((bfd *, bfd *)); | |
30 | static boolean elf32_arm_print_private_bfd_data | |
31 | PARAMS ((bfd *, PTR)); | |
f21f3fe0 | 32 | static int elf32_arm_get_symbol_type |
252b5132 RH |
33 | PARAMS (( Elf_Internal_Sym *, int)); |
34 | static struct bfd_link_hash_table *elf32_arm_link_hash_table_create | |
35 | PARAMS ((bfd *)); | |
36 | static bfd_reloc_status_type elf32_arm_final_link_relocate | |
780a67af NC |
37 | PARAMS ((reloc_howto_type *, bfd *, bfd *, asection *, bfd_byte *, |
38 | Elf_Internal_Rela *, bfd_vma, struct bfd_link_info *, asection *, | |
39 | const char *, unsigned char, struct elf_link_hash_entry *)); | |
252b5132 RH |
40 | |
41 | static insn32 insert_thumb_branch | |
42 | PARAMS ((insn32, int)); | |
43 | static struct elf_link_hash_entry *find_thumb_glue | |
44 | PARAMS ((struct bfd_link_info *, CONST char *, bfd *)); | |
45 | static struct elf_link_hash_entry *find_arm_glue | |
46 | PARAMS ((struct bfd_link_info *, CONST char *, bfd *)); | |
47 | static void record_arm_to_thumb_glue | |
48 | PARAMS ((struct bfd_link_info *, struct elf_link_hash_entry *)); | |
49 | static void record_thumb_to_arm_glue | |
50 | PARAMS ((struct bfd_link_info *, struct elf_link_hash_entry *)); | |
ba96a88f NC |
51 | static void elf32_arm_post_process_headers |
52 | PARAMS ((bfd *, struct bfd_link_info *)); | |
252b5132 RH |
53 | |
54 | /* The linker script knows the section names for placement. | |
55 | The entry_names are used to do simple name mangling on the stubs. | |
56 | Given a function name, and its type, the stub can be found. The | |
57 | name can be changed. The only requirement is the %s be present. | |
58 | */ | |
59 | ||
60 | #define INTERWORK_FLAG( abfd ) (elf_elfheader (abfd)->e_flags & EF_INTERWORK) | |
61 | ||
62 | #define THUMB2ARM_GLUE_SECTION_NAME ".glue_7t" | |
63 | #define THUMB2ARM_GLUE_ENTRY_NAME "__%s_from_thumb" | |
64 | ||
65 | #define ARM2THUMB_GLUE_SECTION_NAME ".glue_7" | |
66 | #define ARM2THUMB_GLUE_ENTRY_NAME "__%s_from_arm" | |
67 | ||
68 | /* The name of the dynamic interpreter. This is put in the .interp | |
69 | section. */ | |
70 | #define ELF_DYNAMIC_INTERPRETER "/usr/lib/ld.so.1" | |
71 | ||
72 | /* The size in bytes of an entry in the procedure linkage table. */ | |
73 | ||
74 | #define PLT_ENTRY_SIZE 16 | |
75 | ||
76 | /* The first entry in a procedure linkage table looks like | |
77 | this. It is set up so that any shared library function that is | |
78 | called before the relocation has been set up calles the dynamic | |
79 | linker first */ | |
80 | ||
81 | static const bfd_byte elf32_arm_plt0_entry [PLT_ENTRY_SIZE] = | |
82 | { | |
83 | 0x04, 0xe0, 0x2d, 0xe5, /* str lr, [sp, #-4]! */ | |
84 | 0x10, 0xe0, 0x9f, 0xe5, /* ldr lr, [pc, #16] */ | |
85 | 0x0e, 0xe0, 0x8f, 0xe0, /* adr lr, pc, lr */ | |
86 | 0x08, 0xf0, 0xbe, 0xe5 /* ldr pc, [lr, #-4] */ | |
87 | }; | |
88 | ||
89 | /* Subsequent entries in a procedure linkage table look like | |
90 | this. */ | |
91 | ||
92 | static const bfd_byte elf32_arm_plt_entry [PLT_ENTRY_SIZE] = | |
93 | { | |
94 | 0x04, 0xc0, 0x9f, 0xe5, /* ldr ip, [pc, #4] */ | |
95 | 0x0c, 0xc0, 0x8f, 0xe0, /* add ip, pc, ip */ | |
96 | 0x00, 0xf0, 0x9c, 0xe5, /* ldr pc, [ip] */ | |
97 | 0x00, 0x00, 0x00, 0x00 /* offset to symbol in got */ | |
98 | }; | |
99 | ||
100 | ||
101 | /* The ARM linker needs to keep track of the number of relocs that it | |
102 | decides to copy in check_relocs for each symbol. This is so that | |
103 | it can discard PC relative relocs if it doesn't need them when | |
104 | linking with -Bsymbolic. We store the information in a field | |
105 | extending the regular ELF linker hash table. */ | |
106 | ||
107 | /* This structure keeps track of the number of PC relative relocs we | |
108 | have copied for a given symbol. */ | |
109 | ||
110 | struct elf32_arm_pcrel_relocs_copied | |
111 | { | |
112 | /* Next section. */ | |
113 | struct elf32_arm_pcrel_relocs_copied * next; | |
114 | /* A section in dynobj. */ | |
115 | asection * section; | |
116 | /* Number of relocs copied in this section. */ | |
117 | bfd_size_type count; | |
118 | }; | |
119 | ||
ba96a88f | 120 | /* Arm ELF linker hash entry. */ |
252b5132 RH |
121 | |
122 | struct elf32_arm_link_hash_entry | |
123 | { | |
124 | struct elf_link_hash_entry root; | |
125 | ||
126 | /* Number of PC relative relocs copied for this symbol. */ | |
127 | struct elf32_arm_pcrel_relocs_copied * pcrel_relocs_copied; | |
128 | }; | |
129 | ||
130 | /* Declare this now that the above structures are defined. */ | |
131 | ||
132 | static boolean elf32_arm_discard_copies | |
133 | PARAMS ((struct elf32_arm_link_hash_entry *, PTR)); | |
134 | ||
135 | /* Traverse an arm ELF linker hash table. */ | |
136 | ||
137 | #define elf32_arm_link_hash_traverse(table, func, info) \ | |
138 | (elf_link_hash_traverse \ | |
139 | (&(table)->root, \ | |
140 | (boolean (*) PARAMS ((struct elf_link_hash_entry *, PTR))) (func), \ | |
141 | (info))) | |
142 | ||
143 | /* Get the ARM elf linker hash table from a link_info structure. */ | |
144 | #define elf32_arm_hash_table(info) \ | |
145 | ((struct elf32_arm_link_hash_table *) ((info)->hash)) | |
146 | ||
147 | /* ARM ELF linker hash table */ | |
148 | struct elf32_arm_link_hash_table | |
149 | { | |
150 | /* The main hash table. */ | |
151 | struct elf_link_hash_table root; | |
152 | ||
153 | /* The size in bytes of the section containg the Thumb-to-ARM glue. */ | |
154 | long int thumb_glue_size; | |
155 | ||
156 | /* The size in bytes of the section containg the ARM-to-Thumb glue. */ | |
157 | long int arm_glue_size; | |
158 | ||
159 | /* An arbitary input BFD chosen to hold the glue sections. */ | |
160 | bfd * bfd_of_glue_owner; | |
ba96a88f NC |
161 | |
162 | /* A boolean indicating whether knowledge of the ARM's pipeline | |
163 | length should be applied by the linker. */ | |
164 | int no_pipeline_knowledge; | |
252b5132 RH |
165 | }; |
166 | ||
167 | ||
780a67af NC |
168 | /* Create an entry in an ARM ELF linker hash table. */ |
169 | ||
170 | static struct bfd_hash_entry * | |
171 | elf32_arm_link_hash_newfunc (entry, table, string) | |
172 | struct bfd_hash_entry * entry; | |
173 | struct bfd_hash_table * table; | |
174 | const char * string; | |
175 | { | |
176 | struct elf32_arm_link_hash_entry * ret = | |
177 | (struct elf32_arm_link_hash_entry *) entry; | |
178 | ||
179 | /* Allocate the structure if it has not already been allocated by a | |
180 | subclass. */ | |
181 | if (ret == (struct elf32_arm_link_hash_entry *) NULL) | |
182 | ret = ((struct elf32_arm_link_hash_entry *) | |
183 | bfd_hash_allocate (table, | |
184 | sizeof (struct elf32_arm_link_hash_entry))); | |
185 | if (ret == (struct elf32_arm_link_hash_entry *) NULL) | |
186 | return (struct bfd_hash_entry *) ret; | |
187 | ||
188 | /* Call the allocation method of the superclass. */ | |
189 | ret = ((struct elf32_arm_link_hash_entry *) | |
190 | _bfd_elf_link_hash_newfunc ((struct bfd_hash_entry *) ret, | |
191 | table, string)); | |
192 | if (ret != (struct elf32_arm_link_hash_entry *) NULL) | |
193 | ret->pcrel_relocs_copied = NULL; | |
194 | ||
195 | return (struct bfd_hash_entry *) ret; | |
196 | } | |
197 | ||
252b5132 RH |
198 | /* Create an ARM elf linker hash table */ |
199 | ||
200 | static struct bfd_link_hash_table * | |
201 | elf32_arm_link_hash_table_create (abfd) | |
202 | bfd *abfd; | |
203 | { | |
204 | struct elf32_arm_link_hash_table *ret; | |
205 | ||
206 | ret = ((struct elf32_arm_link_hash_table *) | |
207 | bfd_alloc (abfd, sizeof (struct elf32_arm_link_hash_table))); | |
208 | if (ret == (struct elf32_arm_link_hash_table *) NULL) | |
209 | return NULL; | |
210 | ||
211 | if (!_bfd_elf_link_hash_table_init (&ret->root, abfd, | |
780a67af | 212 | elf32_arm_link_hash_newfunc)) |
252b5132 RH |
213 | { |
214 | bfd_release (abfd, ret); | |
215 | return NULL; | |
216 | } | |
217 | ||
218 | ret->thumb_glue_size = 0; | |
219 | ret->arm_glue_size = 0; | |
220 | ret->bfd_of_glue_owner = NULL; | |
ba96a88f | 221 | ret->no_pipeline_knowledge = 0; |
252b5132 RH |
222 | |
223 | return &ret->root.root; | |
224 | } | |
225 | ||
226 | static struct elf_link_hash_entry * | |
227 | find_thumb_glue (link_info, name, input_bfd) | |
228 | struct bfd_link_info *link_info; | |
229 | CONST char *name; | |
230 | bfd *input_bfd; | |
231 | { | |
232 | char *tmp_name; | |
233 | struct elf_link_hash_entry *hash; | |
234 | struct elf32_arm_link_hash_table *hash_table; | |
235 | ||
236 | /* We need a pointer to the armelf specific hash table. */ | |
237 | hash_table = elf32_arm_hash_table (link_info); | |
238 | ||
239 | ||
240 | tmp_name = ((char *) | |
241 | bfd_malloc (strlen (name) + strlen (THUMB2ARM_GLUE_ENTRY_NAME) + 1)); | |
242 | ||
243 | BFD_ASSERT (tmp_name); | |
244 | ||
245 | sprintf (tmp_name, THUMB2ARM_GLUE_ENTRY_NAME, name); | |
246 | ||
247 | hash = elf_link_hash_lookup | |
248 | (&(hash_table)->root, tmp_name, false, false, true); | |
249 | ||
250 | if (hash == NULL) | |
251 | /* xgettext:c-format */ | |
252 | _bfd_error_handler (_ ("%s: unable to find THUMB glue '%s' for `%s'"), | |
253 | bfd_get_filename (input_bfd), tmp_name, name); | |
254 | ||
255 | free (tmp_name); | |
256 | ||
257 | return hash; | |
258 | } | |
259 | ||
260 | static struct elf_link_hash_entry * | |
261 | find_arm_glue (link_info, name, input_bfd) | |
262 | struct bfd_link_info *link_info; | |
263 | CONST char *name; | |
264 | bfd *input_bfd; | |
265 | { | |
266 | char *tmp_name; | |
267 | struct elf_link_hash_entry *myh; | |
268 | struct elf32_arm_link_hash_table *hash_table; | |
269 | ||
270 | /* We need a pointer to the elfarm specific hash table. */ | |
271 | hash_table = elf32_arm_hash_table (link_info); | |
272 | ||
273 | tmp_name = ((char *) | |
274 | bfd_malloc (strlen (name) + strlen (ARM2THUMB_GLUE_ENTRY_NAME) + 1)); | |
275 | ||
276 | BFD_ASSERT (tmp_name); | |
277 | ||
278 | sprintf (tmp_name, ARM2THUMB_GLUE_ENTRY_NAME, name); | |
279 | ||
280 | myh = elf_link_hash_lookup | |
281 | (&(hash_table)->root, tmp_name, false, false, true); | |
282 | ||
283 | if (myh == NULL) | |
284 | /* xgettext:c-format */ | |
285 | _bfd_error_handler (_ ("%s: unable to find ARM glue '%s' for `%s'"), | |
286 | bfd_get_filename (input_bfd), tmp_name, name); | |
287 | ||
288 | free (tmp_name); | |
289 | ||
290 | return myh; | |
291 | } | |
292 | ||
293 | /* | |
294 | ARM->Thumb glue: | |
295 | ||
296 | .arm | |
297 | __func_from_arm: | |
298 | ldr r12, __func_addr | |
299 | bx r12 | |
300 | __func_addr: | |
301 | .word func @ behave as if you saw a ARM_32 reloc | |
302 | */ | |
303 | ||
304 | #define ARM2THUMB_GLUE_SIZE 12 | |
305 | static const insn32 a2t1_ldr_insn = 0xe59fc000; | |
306 | static const insn32 a2t2_bx_r12_insn = 0xe12fff1c; | |
307 | static const insn32 a2t3_func_addr_insn = 0x00000001; | |
308 | ||
309 | /* | |
310 | Thumb->ARM: Thumb->(non-interworking aware) ARM | |
311 | ||
312 | .thumb .thumb | |
313 | .align 2 .align 2 | |
314 | __func_from_thumb: __func_from_thumb: | |
315 | bx pc push {r6, lr} | |
316 | nop ldr r6, __func_addr | |
317 | .arm mov lr, pc | |
318 | __func_change_to_arm: bx r6 | |
319 | b func .arm | |
320 | __func_back_to_thumb: | |
321 | ldmia r13! {r6, lr} | |
322 | bx lr | |
323 | __func_addr: | |
f21f3fe0 | 324 | .word func |
252b5132 RH |
325 | */ |
326 | ||
327 | #define THUMB2ARM_GLUE_SIZE 8 | |
328 | static const insn16 t2a1_bx_pc_insn = 0x4778; | |
329 | static const insn16 t2a2_noop_insn = 0x46c0; | |
330 | static const insn32 t2a3_b_insn = 0xea000000; | |
331 | ||
332 | static const insn16 t2a1_push_insn = 0xb540; | |
333 | static const insn16 t2a2_ldr_insn = 0x4e03; | |
334 | static const insn16 t2a3_mov_insn = 0x46fe; | |
335 | static const insn16 t2a4_bx_insn = 0x4730; | |
336 | static const insn32 t2a5_pop_insn = 0xe8bd4040; | |
337 | static const insn32 t2a6_bx_insn = 0xe12fff1e; | |
338 | ||
339 | boolean | |
340 | bfd_elf32_arm_allocate_interworking_sections (info) | |
341 | struct bfd_link_info * info; | |
342 | { | |
343 | asection * s; | |
344 | bfd_byte * foo; | |
345 | struct elf32_arm_link_hash_table * globals; | |
346 | ||
347 | globals = elf32_arm_hash_table (info); | |
348 | ||
349 | BFD_ASSERT (globals != NULL); | |
350 | ||
351 | if (globals->arm_glue_size != 0) | |
352 | { | |
353 | BFD_ASSERT (globals->bfd_of_glue_owner != NULL); | |
354 | ||
355 | s = bfd_get_section_by_name | |
356 | (globals->bfd_of_glue_owner, ARM2THUMB_GLUE_SECTION_NAME); | |
357 | ||
358 | BFD_ASSERT (s != NULL); | |
359 | ||
360 | foo = (bfd_byte *) bfd_alloc | |
361 | (globals->bfd_of_glue_owner, globals->arm_glue_size); | |
362 | ||
363 | s->_raw_size = s->_cooked_size = globals->arm_glue_size; | |
364 | s->contents = foo; | |
365 | } | |
366 | ||
367 | if (globals->thumb_glue_size != 0) | |
368 | { | |
369 | BFD_ASSERT (globals->bfd_of_glue_owner != NULL); | |
370 | ||
371 | s = bfd_get_section_by_name | |
372 | (globals->bfd_of_glue_owner, THUMB2ARM_GLUE_SECTION_NAME); | |
373 | ||
374 | BFD_ASSERT (s != NULL); | |
375 | ||
376 | foo = (bfd_byte *) bfd_alloc | |
377 | (globals->bfd_of_glue_owner, globals->thumb_glue_size); | |
378 | ||
379 | s->_raw_size = s->_cooked_size = globals->thumb_glue_size; | |
380 | s->contents = foo; | |
381 | } | |
382 | ||
383 | return true; | |
384 | } | |
385 | ||
386 | static void | |
387 | record_arm_to_thumb_glue (link_info, h) | |
388 | struct bfd_link_info * link_info; | |
389 | struct elf_link_hash_entry * h; | |
390 | { | |
391 | const char * name = h->root.root.string; | |
392 | register asection * s; | |
393 | char * tmp_name; | |
394 | struct elf_link_hash_entry * myh; | |
395 | struct elf32_arm_link_hash_table * globals; | |
396 | ||
397 | globals = elf32_arm_hash_table (link_info); | |
398 | ||
399 | BFD_ASSERT (globals != NULL); | |
400 | BFD_ASSERT (globals->bfd_of_glue_owner != NULL); | |
401 | ||
402 | s = bfd_get_section_by_name | |
403 | (globals->bfd_of_glue_owner, ARM2THUMB_GLUE_SECTION_NAME); | |
404 | ||
405 | ||
406 | BFD_ASSERT (s != NULL); | |
407 | ||
408 | tmp_name = ((char *) | |
409 | bfd_malloc (strlen (name) + strlen (ARM2THUMB_GLUE_ENTRY_NAME) + 1)); | |
410 | ||
411 | BFD_ASSERT (tmp_name); | |
412 | ||
413 | sprintf (tmp_name, ARM2THUMB_GLUE_ENTRY_NAME, name); | |
414 | ||
415 | myh = elf_link_hash_lookup | |
416 | (&(globals)->root, tmp_name, false, false, true); | |
417 | ||
418 | if (myh != NULL) | |
419 | { | |
420 | free (tmp_name); | |
421 | return; /* we've already seen this guy */ | |
422 | } | |
423 | ||
424 | /* The only trick here is using hash_table->arm_glue_size as the value. Even | |
425 | though the section isn't allocated yet, this is where we will be putting | |
426 | it. */ | |
427 | ||
428 | _bfd_generic_link_add_one_symbol (link_info, globals->bfd_of_glue_owner, tmp_name, | |
429 | BSF_GLOBAL, | |
430 | s, globals->arm_glue_size + 1, | |
431 | NULL, true, false, | |
432 | (struct bfd_link_hash_entry **) &myh); | |
433 | ||
434 | free (tmp_name); | |
435 | ||
436 | globals->arm_glue_size += ARM2THUMB_GLUE_SIZE; | |
437 | ||
438 | return; | |
439 | } | |
440 | ||
441 | static void | |
442 | record_thumb_to_arm_glue (link_info, h) | |
443 | struct bfd_link_info *link_info; | |
444 | struct elf_link_hash_entry *h; | |
445 | { | |
446 | const char *name = h->root.root.string; | |
447 | register asection *s; | |
448 | char *tmp_name; | |
449 | struct elf_link_hash_entry *myh; | |
450 | struct elf32_arm_link_hash_table *hash_table; | |
451 | char bind; | |
452 | ||
453 | hash_table = elf32_arm_hash_table (link_info); | |
454 | ||
455 | BFD_ASSERT (hash_table != NULL); | |
456 | BFD_ASSERT (hash_table->bfd_of_glue_owner != NULL); | |
457 | ||
458 | s = bfd_get_section_by_name | |
459 | (hash_table->bfd_of_glue_owner, THUMB2ARM_GLUE_SECTION_NAME); | |
460 | ||
461 | BFD_ASSERT (s != NULL); | |
462 | ||
463 | tmp_name = (char *) bfd_malloc (strlen (name) + strlen (THUMB2ARM_GLUE_ENTRY_NAME) + 1); | |
464 | ||
465 | BFD_ASSERT (tmp_name); | |
466 | ||
467 | sprintf (tmp_name, THUMB2ARM_GLUE_ENTRY_NAME, name); | |
468 | ||
469 | myh = elf_link_hash_lookup | |
470 | (&(hash_table)->root, tmp_name, false, false, true); | |
471 | ||
472 | if (myh != NULL) | |
473 | { | |
474 | free (tmp_name); | |
475 | return; /* we've already seen this guy */ | |
476 | } | |
477 | ||
478 | _bfd_generic_link_add_one_symbol (link_info, hash_table->bfd_of_glue_owner, tmp_name, | |
479 | BSF_GLOBAL, s, hash_table->thumb_glue_size + 1, | |
480 | NULL, true, false, | |
481 | (struct bfd_link_hash_entry **) &myh); | |
482 | ||
483 | /* If we mark it 'thumb', the disassembler will do a better job. */ | |
484 | bind = ELF_ST_BIND (myh->type); | |
485 | myh->type = ELF_ST_INFO (bind, STT_ARM_TFUNC); | |
486 | ||
487 | free (tmp_name); | |
488 | ||
489 | /* Allocate another symbol to mark where we switch to arm mode. */ | |
490 | ||
491 | #define CHANGE_TO_ARM "__%s_change_to_arm" | |
492 | #define BACK_FROM_ARM "__%s_back_from_arm" | |
493 | ||
494 | tmp_name = (char *) bfd_malloc (strlen (name) + strlen (CHANGE_TO_ARM) + 1); | |
495 | ||
496 | BFD_ASSERT (tmp_name); | |
497 | ||
498 | sprintf (tmp_name, CHANGE_TO_ARM, name); | |
499 | ||
500 | myh = NULL; | |
501 | ||
502 | _bfd_generic_link_add_one_symbol (link_info, hash_table->bfd_of_glue_owner, tmp_name, | |
503 | BSF_LOCAL, s, hash_table->thumb_glue_size + 4, | |
504 | NULL, true, false, | |
505 | (struct bfd_link_hash_entry **) &myh); | |
506 | ||
507 | free (tmp_name); | |
508 | ||
509 | hash_table->thumb_glue_size += THUMB2ARM_GLUE_SIZE; | |
510 | ||
511 | return; | |
512 | } | |
513 | ||
514 | /* Select a BFD to be used to hold the sections used by the glue code. | |
515 | This function is called from the linker scripts in ld/emultempl/ | |
516 | {armelf/pe}.em */ | |
517 | boolean | |
518 | bfd_elf32_arm_get_bfd_for_interworking (abfd, info) | |
519 | bfd *abfd; | |
520 | struct bfd_link_info *info; | |
521 | { | |
522 | struct elf32_arm_link_hash_table *globals; | |
523 | flagword flags; | |
524 | asection *sec; | |
525 | ||
526 | /* If we are only performing a partial link do not bother | |
527 | getting a bfd to hold the glue. */ | |
528 | if (info->relocateable) | |
529 | return true; | |
530 | ||
531 | globals = elf32_arm_hash_table (info); | |
532 | ||
533 | BFD_ASSERT (globals != NULL); | |
534 | ||
535 | if (globals->bfd_of_glue_owner != NULL) | |
536 | return true; | |
537 | ||
538 | sec = bfd_get_section_by_name (abfd, ARM2THUMB_GLUE_SECTION_NAME); | |
539 | ||
540 | if (sec == NULL) | |
541 | { | |
542 | flags = SEC_ALLOC | SEC_LOAD | SEC_HAS_CONTENTS | SEC_IN_MEMORY; | |
543 | ||
544 | sec = bfd_make_section (abfd, ARM2THUMB_GLUE_SECTION_NAME); | |
545 | ||
546 | if (sec == NULL | |
547 | || !bfd_set_section_flags (abfd, sec, flags) | |
548 | || !bfd_set_section_alignment (abfd, sec, 2)) | |
549 | return false; | |
550 | } | |
551 | ||
552 | sec = bfd_get_section_by_name (abfd, THUMB2ARM_GLUE_SECTION_NAME); | |
553 | ||
554 | if (sec == NULL) | |
555 | { | |
556 | flags = SEC_ALLOC | SEC_LOAD | SEC_HAS_CONTENTS | SEC_IN_MEMORY; | |
557 | ||
558 | sec = bfd_make_section (abfd, THUMB2ARM_GLUE_SECTION_NAME); | |
559 | ||
560 | if (sec == NULL | |
561 | || !bfd_set_section_flags (abfd, sec, flags) | |
562 | || !bfd_set_section_alignment (abfd, sec, 2)) | |
563 | return false; | |
564 | } | |
565 | ||
566 | /* Save the bfd for later use. */ | |
567 | globals->bfd_of_glue_owner = abfd; | |
568 | ||
569 | return true; | |
570 | } | |
571 | ||
572 | boolean | |
ba96a88f | 573 | bfd_elf32_arm_process_before_allocation (abfd, link_info, no_pipeline_knowledge) |
252b5132 RH |
574 | bfd *abfd; |
575 | struct bfd_link_info *link_info; | |
ba96a88f | 576 | int no_pipeline_knowledge; |
252b5132 RH |
577 | { |
578 | Elf_Internal_Shdr *symtab_hdr; | |
579 | Elf_Internal_Rela *free_relocs = NULL; | |
580 | Elf_Internal_Rela *irel, *irelend; | |
581 | bfd_byte *contents = NULL; | |
582 | bfd_byte *free_contents = NULL; | |
583 | Elf32_External_Sym *extsyms = NULL; | |
584 | Elf32_External_Sym *free_extsyms = NULL; | |
585 | ||
586 | asection *sec; | |
587 | struct elf32_arm_link_hash_table *globals; | |
588 | ||
589 | /* If we are only performing a partial link do not bother | |
590 | to construct any glue. */ | |
591 | if (link_info->relocateable) | |
592 | return true; | |
593 | ||
594 | /* Here we have a bfd that is to be included on the link. We have a hook | |
595 | to do reloc rummaging, before section sizes are nailed down. */ | |
596 | ||
597 | globals = elf32_arm_hash_table (link_info); | |
598 | ||
599 | BFD_ASSERT (globals != NULL); | |
600 | BFD_ASSERT (globals->bfd_of_glue_owner != NULL); | |
601 | ||
ba96a88f | 602 | globals->no_pipeline_knowledge = no_pipeline_knowledge; |
f21f3fe0 | 603 | |
252b5132 RH |
604 | /* Rummage around all the relocs and map the glue vectors. */ |
605 | sec = abfd->sections; | |
606 | ||
607 | if (sec == NULL) | |
608 | return true; | |
609 | ||
610 | for (; sec != NULL; sec = sec->next) | |
611 | { | |
612 | if (sec->reloc_count == 0) | |
613 | continue; | |
614 | ||
615 | symtab_hdr = &elf_tdata (abfd)->symtab_hdr; | |
616 | /* Load the relocs. */ | |
617 | ||
618 | irel = (_bfd_elf32_link_read_relocs (abfd, sec, (PTR) NULL, | |
619 | (Elf_Internal_Rela *) NULL, false)); | |
620 | ||
621 | BFD_ASSERT (irel != 0); | |
622 | ||
623 | irelend = irel + sec->reloc_count; | |
624 | for (; irel < irelend; irel++) | |
625 | { | |
626 | long r_type; | |
627 | unsigned long r_index; | |
628 | unsigned char code; | |
629 | ||
630 | struct elf_link_hash_entry *h; | |
631 | ||
632 | r_type = ELF32_R_TYPE (irel->r_info); | |
633 | r_index = ELF32_R_SYM (irel->r_info); | |
634 | ||
635 | /* These are the only relocation types we care about */ | |
ba96a88f | 636 | if ( r_type != R_ARM_PC24 |
252b5132 RH |
637 | && r_type != R_ARM_THM_PC22) |
638 | continue; | |
639 | ||
640 | /* Get the section contents if we haven't done so already. */ | |
641 | if (contents == NULL) | |
642 | { | |
643 | /* Get cached copy if it exists. */ | |
644 | if (elf_section_data (sec)->this_hdr.contents != NULL) | |
645 | contents = elf_section_data (sec)->this_hdr.contents; | |
646 | else | |
647 | { | |
648 | /* Go get them off disk. */ | |
649 | contents = (bfd_byte *) bfd_malloc (sec->_raw_size); | |
650 | if (contents == NULL) | |
651 | goto error_return; | |
652 | free_contents = contents; | |
653 | ||
654 | if (!bfd_get_section_contents (abfd, sec, contents, | |
655 | (file_ptr) 0, sec->_raw_size)) | |
656 | goto error_return; | |
657 | } | |
658 | } | |
659 | ||
660 | /* Read this BFD's symbols if we haven't done so already. */ | |
661 | if (extsyms == NULL) | |
662 | { | |
663 | /* Get cached copy if it exists. */ | |
664 | if (symtab_hdr->contents != NULL) | |
665 | extsyms = (Elf32_External_Sym *) symtab_hdr->contents; | |
666 | else | |
667 | { | |
668 | /* Go get them off disk. */ | |
669 | extsyms = ((Elf32_External_Sym *) | |
670 | bfd_malloc (symtab_hdr->sh_size)); | |
671 | if (extsyms == NULL) | |
672 | goto error_return; | |
673 | free_extsyms = extsyms; | |
674 | if (bfd_seek (abfd, symtab_hdr->sh_offset, SEEK_SET) != 0 | |
675 | || (bfd_read (extsyms, 1, symtab_hdr->sh_size, abfd) | |
676 | != symtab_hdr->sh_size)) | |
677 | goto error_return; | |
678 | } | |
679 | } | |
680 | ||
681 | /* If the relocation is not against a symbol it cannot concern us. */ | |
682 | ||
683 | h = NULL; | |
684 | ||
685 | /* We don't care about local symbols */ | |
686 | if (r_index < symtab_hdr->sh_info) | |
687 | continue; | |
688 | ||
689 | /* This is an external symbol */ | |
690 | r_index -= symtab_hdr->sh_info; | |
691 | h = (struct elf_link_hash_entry *) | |
692 | elf_sym_hashes (abfd)[r_index]; | |
693 | ||
694 | /* If the relocation is against a static symbol it must be within | |
695 | the current section and so cannot be a cross ARM/Thumb relocation. */ | |
696 | if (h == NULL) | |
697 | continue; | |
698 | ||
699 | switch (r_type) | |
700 | { | |
701 | case R_ARM_PC24: | |
702 | /* This one is a call from arm code. We need to look up | |
703 | the target of the call. If it is a thumb target, we | |
704 | insert glue. */ | |
705 | ||
706 | if (ELF_ST_TYPE(h->type) == STT_ARM_TFUNC) | |
707 | record_arm_to_thumb_glue (link_info, h); | |
708 | break; | |
709 | ||
710 | case R_ARM_THM_PC22: | |
f21f3fe0 | 711 | /* This one is a call from thumb code. We look |
252b5132 | 712 | up the target of the call. If it is not a thumb |
f21f3fe0 | 713 | target, we insert glue. */ |
252b5132 RH |
714 | |
715 | if (ELF_ST_TYPE (h->type) != STT_ARM_TFUNC) | |
716 | record_thumb_to_arm_glue (link_info, h); | |
717 | break; | |
718 | ||
719 | default: | |
720 | break; | |
721 | } | |
722 | } | |
723 | } | |
724 | ||
725 | return true; | |
726 | error_return: | |
727 | if (free_relocs != NULL) | |
728 | free (free_relocs); | |
729 | if (free_contents != NULL) | |
730 | free (free_contents); | |
731 | if (free_extsyms != NULL) | |
732 | free (free_extsyms); | |
733 | return false; | |
734 | ||
735 | } | |
736 | ||
737 | /* The thumb form of a long branch is a bit finicky, because the offset | |
738 | encoding is split over two fields, each in it's own instruction. They | |
f21f3fe0 | 739 | can occur in any order. So given a thumb form of long branch, and an |
252b5132 | 740 | offset, insert the offset into the thumb branch and return finished |
f21f3fe0 | 741 | instruction. |
252b5132 | 742 | |
f21f3fe0 | 743 | It takes two thumb instructions to encode the target address. Each has |
252b5132 | 744 | 11 bits to invest. The upper 11 bits are stored in one (identifed by |
f21f3fe0 UD |
745 | H-0.. see below), the lower 11 bits are stored in the other (identified |
746 | by H-1). | |
252b5132 | 747 | |
f21f3fe0 | 748 | Combine together and shifted left by 1 (it's a half word address) and |
252b5132 RH |
749 | there you have it. |
750 | ||
751 | Op: 1111 = F, | |
752 | H-0, upper address-0 = 000 | |
753 | Op: 1111 = F, | |
754 | H-1, lower address-0 = 800 | |
755 | ||
f21f3fe0 | 756 | They can be ordered either way, but the arm tools I've seen always put |
252b5132 RH |
757 | the lower one first. It probably doesn't matter. krk@cygnus.com |
758 | ||
759 | XXX: Actually the order does matter. The second instruction (H-1) | |
760 | moves the computed address into the PC, so it must be the second one | |
761 | in the sequence. The problem, however is that whilst little endian code | |
762 | stores the instructions in HI then LOW order, big endian code does the | |
763 | reverse. nickc@cygnus.com */ | |
764 | ||
765 | #define LOW_HI_ORDER 0xF800F000 | |
766 | #define HI_LOW_ORDER 0xF000F800 | |
767 | ||
768 | static insn32 | |
769 | insert_thumb_branch (br_insn, rel_off) | |
770 | insn32 br_insn; | |
771 | int rel_off; | |
772 | { | |
773 | unsigned int low_bits; | |
774 | unsigned int high_bits; | |
775 | ||
776 | ||
777 | BFD_ASSERT ((rel_off & 1) != 1); | |
778 | ||
779 | rel_off >>= 1; /* half word aligned address */ | |
780 | low_bits = rel_off & 0x000007FF; /* the bottom 11 bits */ | |
781 | high_bits = (rel_off >> 11) & 0x000007FF; /* the top 11 bits */ | |
782 | ||
783 | if ((br_insn & LOW_HI_ORDER) == LOW_HI_ORDER) | |
784 | br_insn = LOW_HI_ORDER | (low_bits << 16) | high_bits; | |
785 | else if ((br_insn & HI_LOW_ORDER) == HI_LOW_ORDER) | |
786 | br_insn = HI_LOW_ORDER | (high_bits << 16) | low_bits; | |
787 | else | |
788 | abort (); /* error - not a valid branch instruction form */ | |
789 | ||
790 | /* FIXME: abort is probably not the right call. krk@cygnus.com */ | |
791 | ||
792 | return br_insn; | |
793 | } | |
794 | ||
795 | /* Thumb code calling an ARM function */ | |
796 | static int | |
797 | elf32_thumb_to_arm_stub (info, name, input_bfd, output_bfd, input_section, | |
798 | hit_data, sym_sec, offset, addend, val) | |
799 | struct bfd_link_info *info; | |
800 | char *name; | |
801 | bfd *input_bfd; | |
802 | bfd *output_bfd; | |
803 | asection *input_section; | |
804 | bfd_byte *hit_data; | |
805 | asection *sym_sec; | |
806 | int offset; | |
807 | int addend; | |
808 | bfd_vma val; | |
809 | { | |
810 | asection *s = 0; | |
811 | long int my_offset; | |
812 | unsigned long int tmp; | |
813 | long int ret_offset; | |
814 | struct elf_link_hash_entry *myh; | |
815 | struct elf32_arm_link_hash_table *globals; | |
816 | ||
817 | myh = find_thumb_glue (info, name, input_bfd); | |
818 | if (myh == NULL) | |
819 | return false; | |
820 | ||
821 | globals = elf32_arm_hash_table (info); | |
822 | ||
823 | BFD_ASSERT (globals != NULL); | |
824 | BFD_ASSERT (globals->bfd_of_glue_owner != NULL); | |
825 | ||
826 | my_offset = myh->root.u.def.value; | |
827 | ||
828 | s = bfd_get_section_by_name (globals->bfd_of_glue_owner, | |
829 | THUMB2ARM_GLUE_SECTION_NAME); | |
830 | ||
831 | BFD_ASSERT (s != NULL); | |
832 | BFD_ASSERT (s->contents != NULL); | |
833 | BFD_ASSERT (s->output_section != NULL); | |
834 | ||
835 | if ((my_offset & 0x01) == 0x01) | |
836 | { | |
837 | if (sym_sec != NULL | |
838 | && sym_sec->owner != NULL | |
839 | && !INTERWORK_FLAG (sym_sec->owner)) | |
840 | { | |
841 | _bfd_error_handler | |
842 | (_ ("%s(%s): warning: interworking not enabled."), | |
843 | bfd_get_filename (sym_sec->owner), name); | |
844 | _bfd_error_handler | |
845 | (_ (" first occurrence: %s: thumb call to arm"), | |
846 | bfd_get_filename (input_bfd)); | |
847 | ||
848 | return false; | |
849 | } | |
850 | ||
851 | --my_offset; | |
852 | myh->root.u.def.value = my_offset; | |
853 | ||
854 | bfd_put_16 (output_bfd, t2a1_bx_pc_insn, | |
855 | s->contents + my_offset); | |
856 | ||
857 | bfd_put_16 (output_bfd, t2a2_noop_insn, | |
858 | s->contents + my_offset + 2); | |
859 | ||
860 | ret_offset = | |
861 | ((bfd_signed_vma) val) /* Address of destination of the stub */ | |
862 | - ((bfd_signed_vma) | |
863 | (s->output_offset /* Offset from the start of the current section to the start of the stubs. */ | |
864 | + my_offset /* Offset of the start of this stub from the start of the stubs. */ | |
865 | + s->output_section->vma) /* Address of the start of the current section. */ | |
866 | + 4 /* The branch instruction is 4 bytes into the stub. */ | |
867 | + 8); /* ARM branches work from the pc of the instruction + 8. */ | |
868 | ||
869 | bfd_put_32 (output_bfd, | |
870 | t2a3_b_insn | ((ret_offset >> 2) & 0x00FFFFFF), | |
871 | s->contents + my_offset + 4); | |
872 | } | |
873 | ||
874 | BFD_ASSERT (my_offset <= globals->thumb_glue_size); | |
875 | ||
876 | /* Now go back and fix up the original BL insn to point | |
877 | to here. */ | |
878 | ret_offset = | |
879 | s->output_offset | |
880 | + my_offset | |
881 | - (input_section->output_offset | |
882 | + offset + addend) | |
883 | - 4; | |
884 | ||
885 | tmp = bfd_get_32 (input_bfd, hit_data | |
886 | - input_section->vma); | |
887 | ||
888 | bfd_put_32 (output_bfd, | |
889 | insert_thumb_branch (tmp, ret_offset), | |
890 | hit_data - input_section->vma); | |
891 | ||
892 | return true; | |
893 | } | |
894 | ||
895 | /* Arm code calling a Thumb function */ | |
896 | static int | |
897 | elf32_arm_to_thumb_stub (info, name, input_bfd, output_bfd, input_section, | |
898 | hit_data, sym_sec, offset, addend, val) | |
899 | ||
900 | struct bfd_link_info *info; | |
901 | char *name; | |
902 | bfd *input_bfd; | |
903 | bfd *output_bfd; | |
904 | asection *input_section; | |
905 | bfd_byte *hit_data; | |
906 | asection *sym_sec; | |
907 | int offset; | |
908 | int addend; | |
909 | bfd_vma val; | |
910 | { | |
911 | unsigned long int tmp; | |
912 | long int my_offset; | |
913 | asection *s; | |
914 | long int ret_offset; | |
915 | struct elf_link_hash_entry *myh; | |
916 | struct elf32_arm_link_hash_table *globals; | |
917 | ||
918 | myh = find_arm_glue (info, name, input_bfd); | |
919 | if (myh == NULL) | |
920 | return false; | |
921 | ||
922 | globals = elf32_arm_hash_table (info); | |
923 | ||
924 | BFD_ASSERT (globals != NULL); | |
925 | BFD_ASSERT (globals->bfd_of_glue_owner != NULL); | |
926 | ||
927 | my_offset = myh->root.u.def.value; | |
928 | s = bfd_get_section_by_name (globals->bfd_of_glue_owner, | |
929 | ARM2THUMB_GLUE_SECTION_NAME); | |
930 | BFD_ASSERT (s != NULL); | |
931 | BFD_ASSERT (s->contents != NULL); | |
932 | BFD_ASSERT (s->output_section != NULL); | |
933 | ||
934 | if ((my_offset & 0x01) == 0x01) | |
935 | { | |
936 | if (sym_sec != NULL | |
937 | && sym_sec->owner != NULL | |
938 | && !INTERWORK_FLAG (sym_sec->owner)) | |
939 | { | |
940 | _bfd_error_handler | |
941 | (_ ("%s(%s): warning: interworking not enabled."), | |
942 | bfd_get_filename (sym_sec->owner), name); | |
943 | _bfd_error_handler | |
944 | (_ (" first occurrence: %s: arm call to thumb"), | |
945 | bfd_get_filename (input_bfd)); | |
946 | } | |
947 | --my_offset; | |
948 | myh->root.u.def.value = my_offset; | |
949 | ||
950 | bfd_put_32 (output_bfd, a2t1_ldr_insn, | |
951 | s->contents + my_offset); | |
952 | ||
953 | bfd_put_32 (output_bfd, a2t2_bx_r12_insn, | |
954 | s->contents + my_offset + 4); | |
955 | ||
956 | /* It's a thumb address. Add the low order bit. */ | |
957 | bfd_put_32 (output_bfd, val | a2t3_func_addr_insn, | |
958 | s->contents + my_offset + 8); | |
959 | } | |
960 | ||
961 | BFD_ASSERT (my_offset <= globals->arm_glue_size); | |
962 | ||
963 | tmp = bfd_get_32 (input_bfd, hit_data); | |
964 | tmp = tmp & 0xFF000000; | |
965 | ||
966 | /* Somehow these are both 4 too far, so subtract 8. */ | |
967 | ret_offset = s->output_offset | |
968 | + my_offset | |
969 | + s->output_section->vma | |
970 | - (input_section->output_offset | |
971 | + input_section->output_section->vma | |
972 | + offset + addend) | |
973 | - 8; | |
974 | ||
975 | tmp = tmp | ((ret_offset >> 2) & 0x00FFFFFF); | |
976 | ||
977 | bfd_put_32 (output_bfd, tmp, hit_data | |
978 | - input_section->vma); | |
979 | ||
980 | ||
981 | return true; | |
982 | } | |
983 | ||
984 | /* Perform a relocation as part of a final link. */ | |
985 | static bfd_reloc_status_type | |
986 | elf32_arm_final_link_relocate (howto, input_bfd, output_bfd, | |
987 | input_section, contents, rel, value, | |
780a67af | 988 | info, sym_sec, sym_name, sym_flags, h) |
252b5132 RH |
989 | reloc_howto_type * howto; |
990 | bfd * input_bfd; | |
991 | bfd * output_bfd; | |
992 | asection * input_section; | |
993 | bfd_byte * contents; | |
994 | Elf_Internal_Rela * rel; | |
995 | bfd_vma value; | |
996 | struct bfd_link_info * info; | |
997 | asection * sym_sec; | |
998 | const char * sym_name; | |
999 | unsigned char sym_flags; | |
780a67af | 1000 | struct elf_link_hash_entry * h; |
252b5132 RH |
1001 | { |
1002 | unsigned long r_type = howto->type; | |
1003 | unsigned long r_symndx; | |
1004 | bfd_byte * hit_data = contents + rel->r_offset; | |
1005 | bfd * dynobj = NULL; | |
1006 | Elf_Internal_Shdr * symtab_hdr; | |
1007 | struct elf_link_hash_entry ** sym_hashes; | |
1008 | bfd_vma * local_got_offsets; | |
1009 | asection * sgot = NULL; | |
1010 | asection * splt = NULL; | |
1011 | asection * sreloc = NULL; | |
252b5132 | 1012 | bfd_vma addend; |
ba96a88f NC |
1013 | bfd_signed_vma signed_addend; |
1014 | struct elf32_arm_link_hash_table * globals; | |
f21f3fe0 | 1015 | |
ba96a88f | 1016 | globals = elf32_arm_hash_table (info); |
f21f3fe0 | 1017 | |
252b5132 RH |
1018 | dynobj = elf_hash_table (info)->dynobj; |
1019 | if (dynobj) | |
1020 | { | |
1021 | sgot = bfd_get_section_by_name (dynobj, ".got"); | |
1022 | splt = bfd_get_section_by_name (dynobj, ".plt"); | |
1023 | } | |
1024 | symtab_hdr = & elf_tdata (input_bfd)->symtab_hdr; | |
1025 | sym_hashes = elf_sym_hashes (input_bfd); | |
1026 | local_got_offsets = elf_local_got_offsets (input_bfd); | |
1027 | r_symndx = ELF32_R_SYM (rel->r_info); | |
1028 | ||
1029 | #ifdef USE_REL | |
ba96a88f NC |
1030 | addend = bfd_get_32 (input_bfd, hit_data) & howto->src_mask; |
1031 | ||
1032 | if (addend & ((howto->src_mask + 1) >> 1)) | |
1033 | { | |
1034 | signed_addend = -1; | |
1035 | signed_addend &= ~ howto->src_mask; | |
1036 | signed_addend |= addend; | |
1037 | } | |
1038 | else | |
1039 | signed_addend = addend; | |
252b5132 | 1040 | #else |
ba96a88f | 1041 | addend = signed_addend = rel->r_addend; |
252b5132 | 1042 | #endif |
f21f3fe0 | 1043 | |
252b5132 RH |
1044 | switch (r_type) |
1045 | { | |
1046 | case R_ARM_NONE: | |
1047 | return bfd_reloc_ok; | |
1048 | ||
1049 | case R_ARM_PC24: | |
1050 | case R_ARM_ABS32: | |
1051 | case R_ARM_REL32: | |
1052 | /* When generating a shared object, these relocations are copied | |
1053 | into the output file to be resolved at run time. */ | |
f21f3fe0 | 1054 | |
252b5132 RH |
1055 | if (info->shared |
1056 | && (r_type != R_ARM_PC24 | |
1057 | || (h != NULL | |
1058 | && h->dynindx != -1 | |
1059 | && (! info->symbolic | |
1060 | || (h->elf_link_hash_flags | |
1061 | & ELF_LINK_HASH_DEF_REGULAR) == 0)))) | |
1062 | { | |
1063 | Elf_Internal_Rel outrel; | |
1064 | boolean skip, relocate; | |
f21f3fe0 | 1065 | |
252b5132 RH |
1066 | if (sreloc == NULL) |
1067 | { | |
1068 | const char * name; | |
f21f3fe0 | 1069 | |
252b5132 RH |
1070 | name = (bfd_elf_string_from_elf_section |
1071 | (input_bfd, | |
1072 | elf_elfheader (input_bfd)->e_shstrndx, | |
1073 | elf_section_data (input_section)->rel_hdr.sh_name)); | |
1074 | if (name == NULL) | |
1075 | return bfd_reloc_notsupported; | |
f21f3fe0 | 1076 | |
252b5132 RH |
1077 | BFD_ASSERT (strncmp (name, ".rel", 4) == 0 |
1078 | && strcmp (bfd_get_section_name (input_bfd, | |
1079 | input_section), | |
1080 | name + 4) == 0); | |
f21f3fe0 | 1081 | |
252b5132 RH |
1082 | sreloc = bfd_get_section_by_name (dynobj, name); |
1083 | BFD_ASSERT (sreloc != NULL); | |
1084 | } | |
f21f3fe0 | 1085 | |
252b5132 | 1086 | skip = false; |
f21f3fe0 | 1087 | |
252b5132 RH |
1088 | if (elf_section_data (input_section)->stab_info == NULL) |
1089 | outrel.r_offset = rel->r_offset; | |
1090 | else | |
1091 | { | |
1092 | bfd_vma off; | |
f21f3fe0 | 1093 | |
252b5132 RH |
1094 | off = (_bfd_stab_section_offset |
1095 | (output_bfd, &elf_hash_table (info)->stab_info, | |
1096 | input_section, | |
1097 | & elf_section_data (input_section)->stab_info, | |
1098 | rel->r_offset)); | |
1099 | if (off == (bfd_vma) -1) | |
1100 | skip = true; | |
1101 | outrel.r_offset = off; | |
1102 | } | |
f21f3fe0 | 1103 | |
252b5132 RH |
1104 | outrel.r_offset += (input_section->output_section->vma |
1105 | + input_section->output_offset); | |
f21f3fe0 | 1106 | |
252b5132 RH |
1107 | if (skip) |
1108 | { | |
1109 | memset (&outrel, 0, sizeof outrel); | |
1110 | relocate = false; | |
1111 | } | |
1112 | else if (r_type == R_ARM_PC24) | |
1113 | { | |
1114 | BFD_ASSERT (h != NULL && h->dynindx != -1); | |
1115 | if ((input_section->flags & SEC_ALLOC) != 0) | |
1116 | relocate = false; | |
1117 | else | |
1118 | relocate = true; | |
1119 | outrel.r_info = ELF32_R_INFO (h->dynindx, R_ARM_PC24); | |
1120 | } | |
1121 | else | |
1122 | { | |
1123 | if (h == NULL | |
1124 | || ((info->symbolic || h->dynindx == -1) | |
1125 | && (h->elf_link_hash_flags | |
1126 | & ELF_LINK_HASH_DEF_REGULAR) != 0)) | |
1127 | { | |
1128 | relocate = true; | |
1129 | outrel.r_info = ELF32_R_INFO (0, R_ARM_RELATIVE); | |
1130 | } | |
1131 | else | |
1132 | { | |
1133 | BFD_ASSERT (h->dynindx != -1); | |
1134 | if ((input_section->flags & SEC_ALLOC) != 0) | |
1135 | relocate = false; | |
1136 | else | |
1137 | relocate = true; | |
1138 | outrel.r_info = ELF32_R_INFO (h->dynindx, R_ARM_ABS32); | |
1139 | } | |
1140 | } | |
f21f3fe0 | 1141 | |
252b5132 RH |
1142 | bfd_elf32_swap_reloc_out (output_bfd, &outrel, |
1143 | (((Elf32_External_Rel *) | |
1144 | sreloc->contents) | |
1145 | + sreloc->reloc_count)); | |
1146 | ++sreloc->reloc_count; | |
f21f3fe0 UD |
1147 | |
1148 | /* If this reloc is against an external symbol, we do not want to | |
252b5132 RH |
1149 | fiddle with the addend. Otherwise, we need to include the symbol |
1150 | value so that it becomes an addend for the dynamic reloc. */ | |
1151 | if (! relocate) | |
1152 | return bfd_reloc_ok; | |
f21f3fe0 UD |
1153 | |
1154 | return _bfd_final_link_relocate (howto, input_bfd, input_section, | |
252b5132 RH |
1155 | contents, rel->r_offset, value, |
1156 | (bfd_vma) 0); | |
1157 | } | |
1158 | else switch (r_type) | |
1159 | { | |
1160 | case R_ARM_PC24: | |
1161 | /* Arm B/BL instruction */ | |
f21f3fe0 | 1162 | |
252b5132 RH |
1163 | /* Check for arm calling thumb function. */ |
1164 | if (sym_flags == STT_ARM_TFUNC) | |
1165 | { | |
1166 | elf32_arm_to_thumb_stub (info, sym_name, input_bfd, output_bfd, | |
1167 | input_section, hit_data, sym_sec, rel->r_offset, addend, value); | |
1168 | return bfd_reloc_ok; | |
1169 | } | |
ba96a88f NC |
1170 | |
1171 | if ( strcmp (bfd_get_target (input_bfd), "elf32-littlearm-oabi") == 0 | |
1172 | || strcmp (bfd_get_target (input_bfd), "elf32-bigarm-oabi") == 0) | |
1173 | { | |
1174 | /* The old way of doing things. Trearing the addend as a | |
1175 | byte sized field and adding in the pipeline offset. */ | |
f21f3fe0 | 1176 | |
ba96a88f NC |
1177 | value -= (input_section->output_section->vma |
1178 | + input_section->output_offset); | |
1179 | value -= rel->r_offset; | |
1180 | value += addend; | |
f21f3fe0 | 1181 | |
ba96a88f NC |
1182 | if (! globals->no_pipeline_knowledge) |
1183 | value -= 8; | |
1184 | } | |
1185 | else | |
1186 | { | |
1187 | /* The ARM ELF ABI says that this reloc is computed as: S - P + A | |
1188 | where: | |
1189 | S is the address of the symbol in the relocation. | |
1190 | P is address of the instruction being relocated. | |
1191 | A is the addend (extracted from the instruction) in bytes. | |
f21f3fe0 | 1192 | |
ba96a88f NC |
1193 | S is held in 'value'. |
1194 | P is the base address of the section containing the instruction | |
1195 | plus the offset of the reloc into that section, ie: | |
1196 | (input_section->output_section->vma + | |
1197 | input_section->output_offset + | |
1198 | rel->r_offset). | |
1199 | A is the addend, converted into bytes, ie: | |
1200 | (signed_addend * 4) | |
1201 | ||
1202 | Note: None of these operations have knowledge of the pipeline | |
1203 | size of the processor, thus it is up to the assembler to encode | |
1204 | this information into the addend. */ | |
1205 | ||
1206 | value -= (input_section->output_section->vma | |
1207 | + input_section->output_offset); | |
1208 | value -= rel->r_offset; | |
1209 | value += (signed_addend << howto->size); | |
f21f3fe0 | 1210 | |
ba96a88f NC |
1211 | /* Previous versions of this code also used to add in the pipeline |
1212 | offset here. This is wrong because the linker is not supposed | |
1213 | to know about such things, and one day it might change. In order | |
1214 | to support old binaries that need the old behaviour however, so | |
1215 | we attempt to detect which ABI was used to create the reloc. */ | |
1216 | if (! globals->no_pipeline_knowledge) | |
f21f3fe0 | 1217 | { |
ba96a88f | 1218 | Elf_Internal_Ehdr * i_ehdrp; /* Elf file header, internal form */ |
f21f3fe0 | 1219 | |
ba96a88f | 1220 | i_ehdrp = elf_elfheader (input_bfd); |
f21f3fe0 | 1221 | |
ba96a88f NC |
1222 | if (i_ehdrp->e_ident[EI_OSABI] == 0) |
1223 | value -= 8; | |
1224 | } | |
1225 | } | |
f21f3fe0 UD |
1226 | |
1227 | value >>= howto->rightshift; | |
ba96a88f NC |
1228 | value &= howto->dst_mask; |
1229 | value |= (bfd_get_32 (input_bfd, hit_data) & (~ howto->dst_mask)); | |
252b5132 | 1230 | break; |
f21f3fe0 | 1231 | |
252b5132 RH |
1232 | case R_ARM_ABS32: |
1233 | value += addend; | |
1234 | if (sym_flags == STT_ARM_TFUNC) | |
1235 | value |= 1; | |
1236 | break; | |
f21f3fe0 | 1237 | |
252b5132 RH |
1238 | case R_ARM_REL32: |
1239 | value -= (input_section->output_section->vma | |
1240 | + input_section->output_offset); | |
1241 | value += addend; | |
1242 | break; | |
1243 | } | |
f21f3fe0 | 1244 | |
252b5132 RH |
1245 | bfd_put_32 (input_bfd, value, hit_data); |
1246 | return bfd_reloc_ok; | |
1247 | ||
1248 | case R_ARM_ABS8: | |
1249 | value += addend; | |
1250 | if ((long) value > 0x7f || (long) value < -0x80) | |
1251 | return bfd_reloc_overflow; | |
1252 | ||
1253 | bfd_put_8 (input_bfd, value, hit_data); | |
1254 | return bfd_reloc_ok; | |
1255 | ||
1256 | case R_ARM_ABS16: | |
1257 | value += addend; | |
1258 | ||
1259 | if ((long) value > 0x7fff || (long) value < -0x8000) | |
1260 | return bfd_reloc_overflow; | |
1261 | ||
1262 | bfd_put_16 (input_bfd, value, hit_data); | |
1263 | return bfd_reloc_ok; | |
1264 | ||
1265 | case R_ARM_ABS12: | |
1266 | /* Support ldr and str instruction for the arm */ | |
1267 | /* Also thumb b (unconditional branch). ??? Really? */ | |
1268 | value += addend; | |
1269 | ||
1270 | if ((long) value > 0x7ff || (long) value < -0x800) | |
1271 | return bfd_reloc_overflow; | |
1272 | ||
1273 | value |= (bfd_get_32 (input_bfd, hit_data) & 0xfffff000); | |
1274 | bfd_put_32 (input_bfd, value, hit_data); | |
1275 | return bfd_reloc_ok; | |
1276 | ||
1277 | case R_ARM_THM_ABS5: | |
1278 | /* Support ldr and str instructions for the thumb. */ | |
1279 | #ifdef USE_REL | |
1280 | /* Need to refetch addend. */ | |
1281 | addend = bfd_get_16 (input_bfd, hit_data) & howto->src_mask; | |
1282 | /* ??? Need to determine shift amount from operand size. */ | |
1283 | addend >>= howto->rightshift; | |
1284 | #endif | |
1285 | value += addend; | |
1286 | ||
1287 | /* ??? Isn't value unsigned? */ | |
1288 | if ((long) value > 0x1f || (long) value < -0x10) | |
1289 | return bfd_reloc_overflow; | |
1290 | ||
1291 | /* ??? Value needs to be properly shifted into place first. */ | |
1292 | value |= bfd_get_16 (input_bfd, hit_data) & 0xf83f; | |
1293 | bfd_put_16 (input_bfd, value, hit_data); | |
1294 | return bfd_reloc_ok; | |
1295 | ||
1296 | case R_ARM_THM_PC22: | |
1297 | /* Thumb BL (branch long instruction). */ | |
1298 | { | |
ba96a88f NC |
1299 | bfd_vma relocation; |
1300 | boolean overflow = false; | |
1301 | bfd_vma upper_insn = bfd_get_16 (input_bfd, hit_data); | |
1302 | bfd_vma lower_insn = bfd_get_16 (input_bfd, hit_data + 2); | |
1303 | bfd_vma src_mask = 0x007FFFFE; | |
252b5132 | 1304 | bfd_signed_vma reloc_signed_max = (1 << (howto->bitsize - 1)) - 1; |
ba96a88f NC |
1305 | bfd_signed_vma reloc_signed_min = ~ reloc_signed_max; |
1306 | bfd_vma check; | |
252b5132 | 1307 | bfd_signed_vma signed_check; |
252b5132 RH |
1308 | |
1309 | #ifdef USE_REL | |
1310 | /* Need to refetch the addend and squish the two 11 bit pieces | |
1311 | together. */ | |
1312 | { | |
ba96a88f NC |
1313 | bfd_vma upper = upper_insn & 0x7ff; |
1314 | bfd_vma lower = lower_insn & 0x7ff; | |
252b5132 RH |
1315 | upper = (upper ^ 0x400) - 0x400; /* sign extend */ |
1316 | addend = (upper << 12) | (lower << 1); | |
ba96a88f | 1317 | signed_addend = addend; |
252b5132 RH |
1318 | } |
1319 | #endif | |
1320 | ||
1321 | /* If it's not a call to thumb, assume call to arm */ | |
1322 | if (sym_flags != STT_ARM_TFUNC) | |
1323 | { | |
1324 | if (elf32_thumb_to_arm_stub | |
1325 | (info, sym_name, input_bfd, output_bfd, input_section, | |
1326 | hit_data, sym_sec, rel->r_offset, addend, value)) | |
1327 | return bfd_reloc_ok; | |
1328 | else | |
1329 | return bfd_reloc_dangerous; | |
1330 | } | |
f21f3fe0 | 1331 | |
ba96a88f | 1332 | relocation = value + signed_addend; |
f21f3fe0 | 1333 | |
252b5132 | 1334 | relocation -= (input_section->output_section->vma |
ba96a88f NC |
1335 | + input_section->output_offset |
1336 | + rel->r_offset); | |
f21f3fe0 | 1337 | |
ba96a88f NC |
1338 | if (! globals->no_pipeline_knowledge) |
1339 | { | |
1340 | Elf_Internal_Ehdr * i_ehdrp; /* Elf file header, internal form */ | |
f21f3fe0 | 1341 | |
ba96a88f | 1342 | i_ehdrp = elf_elfheader (input_bfd); |
f21f3fe0 | 1343 | |
ba96a88f NC |
1344 | /* Previous versions of this code also used to add in the pipline |
1345 | offset here. This is wrong because the linker is not supposed | |
1346 | to know about such things, and one day it might change. In order | |
1347 | to support old binaries that need the old behaviour however, so | |
1348 | we attempt to detect which ABI was used to create the reloc. */ | |
1349 | if ( strcmp (bfd_get_target (input_bfd), "elf32-littlearm-oabi") == 0 | |
1350 | || strcmp (bfd_get_target (input_bfd), "elf32-bigarm-oabi") == 0 | |
1351 | || i_ehdrp->e_ident[EI_OSABI] == 0) | |
1352 | relocation += 4; | |
1353 | } | |
f21f3fe0 | 1354 | |
252b5132 RH |
1355 | check = relocation >> howto->rightshift; |
1356 | ||
1357 | /* If this is a signed value, the rightshift just dropped | |
1358 | leading 1 bits (assuming twos complement). */ | |
1359 | if ((bfd_signed_vma) relocation >= 0) | |
1360 | signed_check = check; | |
1361 | else | |
1362 | signed_check = check | ~((bfd_vma) -1 >> howto->rightshift); | |
1363 | ||
252b5132 | 1364 | /* Assumes two's complement. */ |
ba96a88f | 1365 | if (signed_check > reloc_signed_max || signed_check < reloc_signed_min) |
252b5132 RH |
1366 | overflow = true; |
1367 | ||
1368 | /* Put RELOCATION back into the insn. */ | |
1369 | upper_insn = (upper_insn & ~(bfd_vma) 0x7ff) | ((relocation >> 12) & 0x7ff); | |
1370 | lower_insn = (lower_insn & ~(bfd_vma) 0x7ff) | ((relocation >> 1) & 0x7ff); | |
1371 | ||
1372 | /* Put the relocated value back in the object file: */ | |
1373 | bfd_put_16 (input_bfd, upper_insn, hit_data); | |
1374 | bfd_put_16 (input_bfd, lower_insn, hit_data + 2); | |
1375 | ||
1376 | return (overflow ? bfd_reloc_overflow : bfd_reloc_ok); | |
1377 | } | |
1378 | break; | |
1379 | ||
1380 | case R_ARM_GNU_VTINHERIT: | |
1381 | case R_ARM_GNU_VTENTRY: | |
1382 | return bfd_reloc_ok; | |
1383 | ||
1384 | case R_ARM_COPY: | |
1385 | return bfd_reloc_notsupported; | |
1386 | ||
1387 | case R_ARM_GLOB_DAT: | |
1388 | return bfd_reloc_notsupported; | |
1389 | ||
1390 | case R_ARM_JUMP_SLOT: | |
1391 | return bfd_reloc_notsupported; | |
1392 | ||
1393 | case R_ARM_RELATIVE: | |
1394 | return bfd_reloc_notsupported; | |
1395 | ||
1396 | case R_ARM_GOTOFF: | |
1397 | /* Relocation is relative to the start of the | |
1398 | global offset table. */ | |
1399 | ||
1400 | BFD_ASSERT (sgot != NULL); | |
1401 | if (sgot == NULL) | |
1402 | return bfd_reloc_notsupported; | |
f21f3fe0 | 1403 | |
252b5132 RH |
1404 | /* Note that sgot->output_offset is not involved in this |
1405 | calculation. We always want the start of .got. If we | |
1406 | define _GLOBAL_OFFSET_TABLE in a different way, as is | |
1407 | permitted by the ABI, we might have to change this | |
1408 | calculation. */ | |
f21f3fe0 | 1409 | |
252b5132 | 1410 | value -= sgot->output_section->vma; |
f21f3fe0 | 1411 | return _bfd_final_link_relocate (howto, input_bfd, input_section, |
252b5132 RH |
1412 | contents, rel->r_offset, value, |
1413 | (bfd_vma) 0); | |
1414 | ||
1415 | case R_ARM_GOTPC: | |
1416 | /* Use global offset table as symbol value. */ | |
1417 | ||
1418 | BFD_ASSERT (sgot != NULL); | |
f21f3fe0 | 1419 | |
252b5132 RH |
1420 | if (sgot == NULL) |
1421 | return bfd_reloc_notsupported; | |
1422 | ||
1423 | value = sgot->output_section->vma; | |
f21f3fe0 | 1424 | return _bfd_final_link_relocate (howto, input_bfd, input_section, |
252b5132 RH |
1425 | contents, rel->r_offset, value, |
1426 | (bfd_vma) 0); | |
f21f3fe0 | 1427 | |
252b5132 RH |
1428 | case R_ARM_GOT32: |
1429 | /* Relocation is to the entry for this symbol in the | |
1430 | global offset table. */ | |
1431 | if (sgot == NULL) | |
1432 | return bfd_reloc_notsupported; | |
f21f3fe0 | 1433 | |
252b5132 RH |
1434 | if (h != NULL) |
1435 | { | |
1436 | bfd_vma off; | |
f21f3fe0 | 1437 | |
252b5132 RH |
1438 | off = h->got.offset; |
1439 | BFD_ASSERT (off != (bfd_vma) -1); | |
f21f3fe0 | 1440 | |
252b5132 RH |
1441 | if (!elf_hash_table (info)->dynamic_sections_created || |
1442 | (info->shared && (info->symbolic || h->dynindx == -1) | |
1443 | && (h->elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR))) | |
1444 | { | |
1445 | /* This is actually a static link, or it is a -Bsymbolic link | |
1446 | and the symbol is defined locally. We must initialize this | |
1447 | entry in the global offset table. Since the offset must | |
1448 | always be a multiple of 4, we use the least significant bit | |
1449 | to record whether we have initialized it already. | |
f21f3fe0 | 1450 | |
252b5132 | 1451 | When doing a dynamic link, we create a .rel.got relocation |
f21f3fe0 | 1452 | entry to initialize the value. This is done in the |
252b5132 | 1453 | finish_dynamic_symbol routine. */ |
f21f3fe0 | 1454 | |
252b5132 RH |
1455 | if ((off & 1) != 0) |
1456 | off &= ~1; | |
1457 | else | |
1458 | { | |
1459 | bfd_put_32 (output_bfd, value, sgot->contents + off); | |
1460 | h->got.offset |= 1; | |
1461 | } | |
1462 | } | |
f21f3fe0 | 1463 | |
252b5132 RH |
1464 | value = sgot->output_offset + off; |
1465 | } | |
1466 | else | |
1467 | { | |
1468 | bfd_vma off; | |
f21f3fe0 | 1469 | |
252b5132 RH |
1470 | BFD_ASSERT (local_got_offsets != NULL && |
1471 | local_got_offsets[r_symndx] != (bfd_vma) -1); | |
f21f3fe0 | 1472 | |
252b5132 | 1473 | off = local_got_offsets[r_symndx]; |
f21f3fe0 | 1474 | |
252b5132 RH |
1475 | /* The offset must always be a multiple of 4. We use the |
1476 | least significant bit to record whether we have already | |
1477 | generated the necessary reloc. */ | |
1478 | if ((off & 1) != 0) | |
1479 | off &= ~1; | |
1480 | else | |
1481 | { | |
1482 | bfd_put_32 (output_bfd, value, sgot->contents + off); | |
f21f3fe0 | 1483 | |
252b5132 RH |
1484 | if (info->shared) |
1485 | { | |
1486 | asection * srelgot; | |
1487 | Elf_Internal_Rel outrel; | |
f21f3fe0 | 1488 | |
252b5132 RH |
1489 | srelgot = bfd_get_section_by_name (dynobj, ".rel.got"); |
1490 | BFD_ASSERT (srelgot != NULL); | |
f21f3fe0 | 1491 | |
252b5132 | 1492 | outrel.r_offset = (sgot->output_section->vma |
f21f3fe0 | 1493 | + sgot->output_offset |
252b5132 RH |
1494 | + off); |
1495 | outrel.r_info = ELF32_R_INFO (0, R_ARM_RELATIVE); | |
1496 | bfd_elf32_swap_reloc_out (output_bfd, &outrel, | |
1497 | (((Elf32_External_Rel *) | |
1498 | srelgot->contents) | |
1499 | + srelgot->reloc_count)); | |
1500 | ++srelgot->reloc_count; | |
1501 | } | |
f21f3fe0 | 1502 | |
252b5132 RH |
1503 | local_got_offsets[r_symndx] |= 1; |
1504 | } | |
f21f3fe0 | 1505 | |
252b5132 RH |
1506 | value = sgot->output_offset + off; |
1507 | } | |
f21f3fe0 UD |
1508 | |
1509 | return _bfd_final_link_relocate (howto, input_bfd, input_section, | |
252b5132 RH |
1510 | contents, rel->r_offset, value, |
1511 | (bfd_vma) 0); | |
f21f3fe0 | 1512 | |
252b5132 RH |
1513 | case R_ARM_PLT32: |
1514 | /* Relocation is to the entry for this symbol in the | |
1515 | procedure linkage table. */ | |
1516 | ||
1517 | /* Resolve a PLT32 reloc against a local symbol directly, | |
1518 | without using the procedure linkage table. */ | |
1519 | if (h == NULL) | |
1520 | return _bfd_final_link_relocate (howto, input_bfd, input_section, | |
1521 | contents, rel->r_offset, value, | |
1522 | (bfd_vma) 0); | |
1523 | ||
1524 | if (h->plt.offset == (bfd_vma) -1) | |
1525 | /* We didn't make a PLT entry for this symbol. This | |
1526 | happens when statically linking PIC code, or when | |
1527 | using -Bsymbolic. */ | |
1528 | return _bfd_final_link_relocate (howto, input_bfd, input_section, | |
1529 | contents, rel->r_offset, value, | |
1530 | (bfd_vma) 0); | |
1531 | ||
1532 | BFD_ASSERT(splt != NULL); | |
1533 | if (splt == NULL) | |
1534 | return bfd_reloc_notsupported; | |
1535 | ||
1536 | value = (splt->output_section->vma | |
1537 | + splt->output_offset | |
1538 | + h->plt.offset); | |
1539 | return _bfd_final_link_relocate (howto, input_bfd, input_section, | |
1540 | contents, rel->r_offset, value, | |
1541 | (bfd_vma) 0); | |
f21f3fe0 | 1542 | |
252b5132 RH |
1543 | case R_ARM_SBREL32: |
1544 | return bfd_reloc_notsupported; | |
1545 | ||
1546 | case R_ARM_AMP_VCALL9: | |
1547 | return bfd_reloc_notsupported; | |
1548 | ||
1549 | case R_ARM_RSBREL32: | |
1550 | return bfd_reloc_notsupported; | |
1551 | ||
1552 | case R_ARM_THM_RPC22: | |
1553 | return bfd_reloc_notsupported; | |
1554 | ||
1555 | case R_ARM_RREL32: | |
1556 | return bfd_reloc_notsupported; | |
1557 | ||
1558 | case R_ARM_RABS32: | |
1559 | return bfd_reloc_notsupported; | |
1560 | ||
1561 | case R_ARM_RPC24: | |
1562 | return bfd_reloc_notsupported; | |
1563 | ||
1564 | case R_ARM_RBASE: | |
1565 | return bfd_reloc_notsupported; | |
1566 | ||
1567 | default: | |
1568 | return bfd_reloc_notsupported; | |
1569 | } | |
1570 | } | |
1571 | ||
1572 | ||
1573 | /* Relocate an ARM ELF section. */ | |
1574 | static boolean | |
1575 | elf32_arm_relocate_section (output_bfd, info, input_bfd, input_section, | |
1576 | contents, relocs, local_syms, local_sections) | |
1577 | bfd * output_bfd; | |
1578 | struct bfd_link_info * info; | |
1579 | bfd * input_bfd; | |
1580 | asection * input_section; | |
1581 | bfd_byte * contents; | |
1582 | Elf_Internal_Rela * relocs; | |
1583 | Elf_Internal_Sym * local_syms; | |
1584 | asection ** local_sections; | |
1585 | { | |
1586 | Elf_Internal_Shdr * symtab_hdr; | |
1587 | struct elf_link_hash_entry ** sym_hashes; | |
1588 | Elf_Internal_Rela * rel; | |
1589 | Elf_Internal_Rela * relend; | |
1590 | const char * name; | |
1591 | ||
1592 | symtab_hdr = & elf_tdata (input_bfd)->symtab_hdr; | |
1593 | sym_hashes = elf_sym_hashes (input_bfd); | |
1594 | ||
1595 | rel = relocs; | |
1596 | relend = relocs + input_section->reloc_count; | |
1597 | for (; rel < relend; rel++) | |
1598 | { | |
ba96a88f NC |
1599 | int r_type; |
1600 | reloc_howto_type * howto; | |
1601 | unsigned long r_symndx; | |
1602 | Elf_Internal_Sym * sym; | |
1603 | asection * sec; | |
252b5132 | 1604 | struct elf_link_hash_entry * h; |
ba96a88f NC |
1605 | bfd_vma relocation; |
1606 | bfd_reloc_status_type r; | |
1607 | arelent bfd_reloc; | |
f21f3fe0 | 1608 | |
252b5132 | 1609 | r_symndx = ELF32_R_SYM (rel->r_info); |
ba96a88f | 1610 | r_type = ELF32_R_TYPE (rel->r_info); |
252b5132 | 1611 | |
ba96a88f NC |
1612 | if ( r_type == R_ARM_GNU_VTENTRY |
1613 | || r_type == R_ARM_GNU_VTINHERIT) | |
252b5132 RH |
1614 | continue; |
1615 | ||
ba96a88f NC |
1616 | elf32_arm_info_to_howto (input_bfd, & bfd_reloc, rel); |
1617 | howto = bfd_reloc.howto; | |
252b5132 RH |
1618 | |
1619 | if (info->relocateable) | |
1620 | { | |
1621 | /* This is a relocateable link. We don't have to change | |
1622 | anything, unless the reloc is against a section symbol, | |
1623 | in which case we have to adjust according to where the | |
1624 | section symbol winds up in the output section. */ | |
1625 | if (r_symndx < symtab_hdr->sh_info) | |
1626 | { | |
1627 | sym = local_syms + r_symndx; | |
1628 | if (ELF_ST_TYPE (sym->st_info) == STT_SECTION) | |
1629 | { | |
1630 | sec = local_sections[r_symndx]; | |
1631 | #ifdef USE_REL | |
1632 | { | |
1633 | bfd_vma val; | |
2ef994e0 | 1634 | bfd_vma insn; |
f21f3fe0 | 1635 | |
2ef994e0 | 1636 | insn = bfd_get_32 (input_bfd, contents + rel->r_offset); |
f21f3fe0 | 1637 | val = insn + ((sec->output_offset + sym->st_value) |
2ef994e0 NC |
1638 | >> howto->rightshift); |
1639 | val &= howto->dst_mask; | |
1640 | val |= insn & ~(howto->dst_mask); | |
f21f3fe0 | 1641 | |
252b5132 RH |
1642 | bfd_put_32 (input_bfd, val, contents + rel->r_offset); |
1643 | } | |
1644 | #else | |
1645 | rel->r_addend += (sec->output_offset + sym->st_value) | |
1646 | >> howto->rightshift; | |
1647 | #endif | |
1648 | } | |
1649 | } | |
1650 | ||
1651 | continue; | |
1652 | } | |
1653 | ||
1654 | /* This is a final link. */ | |
1655 | h = NULL; | |
1656 | sym = NULL; | |
1657 | sec = NULL; | |
1658 | if (r_symndx < symtab_hdr->sh_info) | |
1659 | { | |
1660 | sym = local_syms + r_symndx; | |
1661 | sec = local_sections[r_symndx]; | |
1662 | relocation = (sec->output_section->vma | |
1663 | + sec->output_offset | |
1664 | + sym->st_value); | |
1665 | } | |
1666 | else | |
1667 | { | |
1668 | h = sym_hashes[r_symndx - symtab_hdr->sh_info]; | |
1669 | while (h->root.type == bfd_link_hash_indirect | |
1670 | || h->root.type == bfd_link_hash_warning) | |
1671 | h = (struct elf_link_hash_entry *) h->root.u.i.link; | |
1672 | if (h->root.type == bfd_link_hash_defined | |
1673 | || h->root.type == bfd_link_hash_defweak) | |
1674 | { | |
780a67af | 1675 | int relocation_needed = 1; |
f21f3fe0 | 1676 | |
780a67af | 1677 | sec = h->root.u.def.section; |
f21f3fe0 | 1678 | |
252b5132 | 1679 | /* In these cases, we don't need the relocation value. |
f21f3fe0 | 1680 | We check specially because in some obscure cases |
252b5132 RH |
1681 | sec->output_section will be NULL. */ |
1682 | switch (r_type) | |
1683 | { | |
1684 | case R_ARM_PC24: | |
1685 | case R_ARM_ABS32: | |
1686 | if (info->shared | |
1687 | && ( | |
1688 | (!info->symbolic && h->dynindx != -1) | |
97eaf9de | 1689 | || (h->elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR) == 0 |
252b5132 RH |
1690 | ) |
1691 | && ((input_section->flags & SEC_ALLOC) != 0) | |
1692 | ) | |
780a67af | 1693 | relocation_needed = 0; |
252b5132 | 1694 | break; |
f21f3fe0 | 1695 | |
252b5132 | 1696 | case R_ARM_GOTPC: |
780a67af | 1697 | relocation_needed = 0; |
252b5132 | 1698 | break; |
f21f3fe0 | 1699 | |
252b5132 RH |
1700 | case R_ARM_GOT32: |
1701 | if (elf_hash_table(info)->dynamic_sections_created | |
1702 | && (!info->shared | |
1703 | || (!info->symbolic && h->dynindx != -1) | |
1704 | || (h->elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR) == 0 | |
1705 | ) | |
1706 | ) | |
780a67af | 1707 | relocation_needed = 0; |
252b5132 | 1708 | break; |
f21f3fe0 | 1709 | |
252b5132 RH |
1710 | case R_ARM_PLT32: |
1711 | if (h->plt.offset != (bfd_vma)-1) | |
780a67af | 1712 | relocation_needed = 0; |
252b5132 | 1713 | break; |
f21f3fe0 | 1714 | |
252b5132 RH |
1715 | default: |
1716 | if (sec->output_section == NULL) | |
1717 | { | |
1718 | (*_bfd_error_handler) | |
1719 | (_("%s: warning: unresolvable relocation against symbol `%s' from %s section"), | |
1720 | bfd_get_filename (input_bfd), h->root.root.string, | |
1721 | bfd_get_section_name (input_bfd, input_section)); | |
780a67af | 1722 | relocation_needed = 0; |
252b5132 RH |
1723 | } |
1724 | } | |
780a67af NC |
1725 | |
1726 | if (relocation_needed) | |
1727 | relocation = h->root.u.def.value | |
1728 | + sec->output_section->vma | |
1729 | + sec->output_offset; | |
1730 | else | |
1731 | relocation = 0; | |
252b5132 RH |
1732 | } |
1733 | else if (h->root.type == bfd_link_hash_undefweak) | |
1734 | relocation = 0; | |
1735 | else | |
1736 | { | |
1737 | if (!((*info->callbacks->undefined_symbol) | |
1738 | (info, h->root.root.string, input_bfd, | |
1739 | input_section, rel->r_offset))) | |
1740 | return false; | |
1741 | relocation = 0; | |
1742 | } | |
1743 | } | |
1744 | ||
1745 | if (h != NULL) | |
1746 | name = h->root.root.string; | |
1747 | else | |
1748 | { | |
1749 | name = (bfd_elf_string_from_elf_section | |
1750 | (input_bfd, symtab_hdr->sh_link, sym->st_name)); | |
1751 | if (name == NULL || *name == '\0') | |
1752 | name = bfd_section_name (input_bfd, sec); | |
1753 | } | |
f21f3fe0 | 1754 | |
252b5132 RH |
1755 | r = elf32_arm_final_link_relocate (howto, input_bfd, output_bfd, |
1756 | input_section, contents, rel, | |
1757 | relocation, info, sec, name, | |
1758 | (h ? ELF_ST_TYPE (h->type) : | |
780a67af | 1759 | ELF_ST_TYPE (sym->st_info)), h); |
252b5132 RH |
1760 | |
1761 | if (r != bfd_reloc_ok) | |
1762 | { | |
1763 | const char * msg = (const char *) 0; | |
1764 | ||
1765 | switch (r) | |
1766 | { | |
1767 | case bfd_reloc_overflow: | |
1768 | if (!((*info->callbacks->reloc_overflow) | |
1769 | (info, name, howto->name, (bfd_vma) 0, | |
1770 | input_bfd, input_section, rel->r_offset))) | |
1771 | return false; | |
1772 | break; | |
1773 | ||
1774 | case bfd_reloc_undefined: | |
1775 | if (!((*info->callbacks->undefined_symbol) | |
1776 | (info, name, input_bfd, input_section, | |
1777 | rel->r_offset))) | |
1778 | return false; | |
1779 | break; | |
1780 | ||
1781 | case bfd_reloc_outofrange: | |
1782 | msg = _ ("internal error: out of range error"); | |
1783 | goto common_error; | |
1784 | ||
1785 | case bfd_reloc_notsupported: | |
1786 | msg = _ ("internal error: unsupported relocation error"); | |
1787 | goto common_error; | |
1788 | ||
1789 | case bfd_reloc_dangerous: | |
1790 | msg = _ ("internal error: dangerous error"); | |
1791 | goto common_error; | |
1792 | ||
1793 | default: | |
1794 | msg = _ ("internal error: unknown error"); | |
1795 | /* fall through */ | |
1796 | ||
1797 | common_error: | |
1798 | if (!((*info->callbacks->warning) | |
1799 | (info, msg, name, input_bfd, input_section, | |
1800 | rel->r_offset))) | |
1801 | return false; | |
1802 | break; | |
1803 | } | |
1804 | } | |
1805 | } | |
1806 | ||
1807 | return true; | |
1808 | } | |
1809 | ||
1810 | /* Function to keep ARM specific flags in the ELF header. */ | |
1811 | static boolean | |
1812 | elf32_arm_set_private_flags (abfd, flags) | |
1813 | bfd *abfd; | |
1814 | flagword flags; | |
1815 | { | |
1816 | if (elf_flags_init (abfd) | |
1817 | && elf_elfheader (abfd)->e_flags != flags) | |
1818 | { | |
1819 | if (flags & EF_INTERWORK) | |
1820 | _bfd_error_handler (_ ("\ | |
1821 | Warning: Not setting interwork flag of %s since it has already been specified as non-interworking"), | |
1822 | bfd_get_filename (abfd)); | |
1823 | else | |
1824 | _bfd_error_handler (_ ("\ | |
1825 | Warning: Clearing the interwork flag of %s due to outside request"), | |
1826 | bfd_get_filename (abfd)); | |
1827 | } | |
1828 | else | |
1829 | { | |
1830 | elf_elfheader (abfd)->e_flags = flags; | |
1831 | elf_flags_init (abfd) = true; | |
1832 | } | |
1833 | ||
1834 | return true; | |
1835 | } | |
1836 | ||
1837 | /* Copy backend specific data from one object module to another */ | |
1838 | static boolean | |
1839 | elf32_arm_copy_private_bfd_data (ibfd, obfd) | |
1840 | bfd *ibfd; | |
1841 | bfd *obfd; | |
1842 | { | |
1843 | flagword in_flags; | |
1844 | flagword out_flags; | |
1845 | ||
1846 | if (bfd_get_flavour (ibfd) != bfd_target_elf_flavour | |
1847 | || bfd_get_flavour (obfd) != bfd_target_elf_flavour) | |
1848 | return true; | |
1849 | ||
1850 | in_flags = elf_elfheader (ibfd)->e_flags; | |
1851 | out_flags = elf_elfheader (obfd)->e_flags; | |
1852 | ||
1853 | if (elf_flags_init (obfd) && in_flags != out_flags) | |
1854 | { | |
1855 | /* Cannot mix PIC and non-PIC code. */ | |
1856 | if ((in_flags & EF_PIC) != (out_flags & EF_PIC)) | |
1857 | return false; | |
1858 | ||
1859 | /* Cannot mix APCS26 and APCS32 code. */ | |
1860 | if ((in_flags & EF_APCS_26) != (out_flags & EF_APCS_26)) | |
1861 | return false; | |
1862 | ||
1863 | /* Cannot mix float APCS and non-float APCS code. */ | |
1864 | if ((in_flags & EF_APCS_FLOAT) != (out_flags & EF_APCS_FLOAT)) | |
1865 | return false; | |
1866 | ||
1867 | /* If the src and dest have different interworking flags | |
1868 | then turn off the interworking bit. */ | |
1869 | if ((in_flags & EF_INTERWORK) != (out_flags & EF_INTERWORK)) | |
1870 | { | |
1871 | if (out_flags & EF_INTERWORK) | |
1872 | _bfd_error_handler (_ ("\ | |
1873 | Warning: Clearing the interwork flag in %s because non-interworking code in %s has been linked with it"), | |
1874 | bfd_get_filename (obfd), bfd_get_filename (ibfd)); | |
1875 | ||
1876 | in_flags &= ~EF_INTERWORK; | |
1877 | } | |
1878 | } | |
1879 | ||
1880 | elf_elfheader (obfd)->e_flags = in_flags; | |
1881 | elf_flags_init (obfd) = true; | |
1882 | ||
1883 | return true; | |
1884 | } | |
1885 | ||
1886 | /* Merge backend specific data from an object file to the output | |
1887 | object file when linking. */ | |
1888 | static boolean | |
1889 | elf32_arm_merge_private_bfd_data (ibfd, obfd) | |
1890 | bfd *ibfd; | |
1891 | bfd *obfd; | |
1892 | { | |
1893 | flagword out_flags; | |
1894 | flagword in_flags; | |
1895 | ||
1896 | if ( bfd_get_flavour (ibfd) != bfd_target_elf_flavour | |
1897 | || bfd_get_flavour (obfd) != bfd_target_elf_flavour) | |
1898 | return true; | |
1899 | ||
1900 | /* Check if we have the same endianess */ | |
1901 | if ( ibfd->xvec->byteorder != obfd->xvec->byteorder | |
1902 | && obfd->xvec->byteorder != BFD_ENDIAN_UNKNOWN | |
1903 | && ibfd->xvec->byteorder != BFD_ENDIAN_UNKNOWN) | |
1904 | { | |
1905 | (*_bfd_error_handler) | |
1906 | (_("%s: compiled for a %s endian system and target is %s endian"), | |
1907 | bfd_get_filename (ibfd), | |
1908 | bfd_big_endian (ibfd) ? "big" : "little", | |
1909 | bfd_big_endian (obfd) ? "big" : "little"); | |
1910 | ||
1911 | bfd_set_error (bfd_error_wrong_format); | |
1912 | return false; | |
1913 | } | |
1914 | ||
1915 | /* The input BFD must have had its flags initialised. */ | |
1916 | /* The following seems bogus to me -- The flags are initialized in | |
1917 | the assembler but I don't think an elf_flags_init field is | |
1918 | written into the object */ | |
1919 | /* BFD_ASSERT (elf_flags_init (ibfd)); */ | |
1920 | ||
1921 | in_flags = elf_elfheader (ibfd)->e_flags; | |
1922 | out_flags = elf_elfheader (obfd)->e_flags; | |
1923 | ||
1924 | if (!elf_flags_init (obfd)) | |
1925 | { | |
1926 | /* If the input is the default architecture then do not | |
1927 | bother setting the flags for the output architecture, | |
1928 | instead allow future merges to do this. If no future | |
1929 | merges ever set these flags then they will retain their | |
1930 | unitialised values, which surprise surprise, correspond | |
1931 | to the default values. */ | |
1932 | if (bfd_get_arch_info (ibfd)->the_default) | |
1933 | return true; | |
1934 | ||
1935 | elf_flags_init (obfd) = true; | |
1936 | elf_elfheader (obfd)->e_flags = in_flags; | |
1937 | ||
1938 | if (bfd_get_arch (obfd) == bfd_get_arch (ibfd) | |
1939 | && bfd_get_arch_info (obfd)->the_default) | |
1940 | return bfd_set_arch_mach (obfd, bfd_get_arch (ibfd), bfd_get_mach (ibfd)); | |
1941 | ||
1942 | return true; | |
1943 | } | |
1944 | ||
1945 | /* Check flag compatibility. */ | |
1946 | if (in_flags == out_flags) | |
1947 | return true; | |
1948 | ||
1949 | /* Complain about various flag mismatches. */ | |
1950 | ||
1951 | if ((in_flags & EF_APCS_26) != (out_flags & EF_APCS_26)) | |
1952 | _bfd_error_handler (_ ("\ | |
1953 | Error: %s compiled for APCS-%d, whereas %s is compiled for APCS-%d"), | |
1954 | bfd_get_filename (ibfd), | |
1955 | in_flags & EF_APCS_26 ? 26 : 32, | |
1956 | bfd_get_filename (obfd), | |
1957 | out_flags & EF_APCS_26 ? 26 : 32); | |
1958 | ||
1959 | if ((in_flags & EF_APCS_FLOAT) != (out_flags & EF_APCS_FLOAT)) | |
1960 | _bfd_error_handler (_ ("\ | |
1961 | Error: %s passes floats in %s registers, whereas %s passes them in %s registers"), | |
1962 | bfd_get_filename (ibfd), | |
1963 | in_flags & EF_APCS_FLOAT ? _ ("float") : _ ("integer"), | |
1964 | bfd_get_filename (obfd), | |
1965 | out_flags & EF_APCS_26 ? _ ("float") : _ ("integer")); | |
1966 | ||
1967 | if ((in_flags & EF_PIC) != (out_flags & EF_PIC)) | |
1968 | _bfd_error_handler (_ ("\ | |
1969 | Error: %s is compiled as position %s code, whereas %s is not"), | |
1970 | bfd_get_filename (ibfd), | |
1971 | in_flags & EF_PIC ? _ ("independent") : _ ("dependent"), | |
1972 | bfd_get_filename (obfd)); | |
1973 | ||
1974 | /* Interworking mismatch is only a warning. */ | |
1975 | if ((in_flags & EF_INTERWORK) != (out_flags & EF_INTERWORK)) | |
1976 | { | |
1977 | _bfd_error_handler (_ ("\ | |
1978 | Warning: %s %s interworking, whereas %s %s"), | |
1979 | bfd_get_filename (ibfd), | |
1980 | in_flags & EF_INTERWORK ? _ ("supports") : _ ("does not support"), | |
1981 | bfd_get_filename (obfd), | |
1982 | out_flags & EF_INTERWORK ? _ ("does not") : _ ("does")); | |
1983 | return true; | |
1984 | } | |
1985 | ||
1986 | return false; | |
1987 | } | |
1988 | ||
1989 | /* Display the flags field */ | |
1990 | static boolean | |
1991 | elf32_arm_print_private_bfd_data (abfd, ptr) | |
1992 | bfd *abfd; | |
1993 | PTR ptr; | |
1994 | { | |
1995 | FILE *file = (FILE *) ptr; | |
1996 | ||
1997 | BFD_ASSERT (abfd != NULL && ptr != NULL); | |
1998 | ||
1999 | /* Print normal ELF private data. */ | |
2000 | _bfd_elf_print_private_bfd_data (abfd, ptr); | |
2001 | ||
2002 | /* Ignore init flag - it may not be set, despite the flags field containing valid data. */ | |
2003 | ||
2004 | /* xgettext:c-format */ | |
2005 | fprintf (file, _ ("private flags = %lx:"), elf_elfheader (abfd)->e_flags); | |
2006 | ||
2007 | if (elf_elfheader (abfd)->e_flags & EF_INTERWORK) | |
2008 | fprintf (file, _ (" [interworking enabled]")); | |
2009 | else | |
2010 | fprintf (file, _ (" [interworking not enabled]")); | |
2011 | ||
2012 | if (elf_elfheader (abfd)->e_flags & EF_APCS_26) | |
2013 | fprintf (file, _ (" [APCS-26]")); | |
2014 | else | |
2015 | fprintf (file, _ (" [APCS-32]")); | |
2016 | ||
2017 | if (elf_elfheader (abfd)->e_flags & EF_APCS_FLOAT) | |
2018 | fprintf (file, _ (" [floats passed in float registers]")); | |
2019 | else | |
2020 | fprintf (file, _ (" [floats passed in integer registers]")); | |
2021 | ||
2022 | if (elf_elfheader (abfd)->e_flags & EF_PIC) | |
2023 | fprintf (file, _ (" [position independent]")); | |
2024 | else | |
2025 | fprintf (file, _ (" [absolute position]")); | |
2026 | ||
2027 | fputc ('\n', file); | |
2028 | ||
2029 | return true; | |
2030 | } | |
2031 | ||
2032 | static int | |
2033 | elf32_arm_get_symbol_type (elf_sym, type) | |
2034 | Elf_Internal_Sym * elf_sym; | |
2035 | int type; | |
2036 | { | |
2037 | if (ELF_ST_TYPE (elf_sym->st_info) == STT_ARM_TFUNC) | |
2038 | return ELF_ST_TYPE (elf_sym->st_info); | |
2039 | else | |
2040 | return type; | |
2041 | } | |
f21f3fe0 | 2042 | |
252b5132 RH |
2043 | static asection * |
2044 | elf32_arm_gc_mark_hook (abfd, info, rel, h, sym) | |
2045 | bfd *abfd; | |
2046 | struct bfd_link_info *info; | |
2047 | Elf_Internal_Rela *rel; | |
2048 | struct elf_link_hash_entry *h; | |
2049 | Elf_Internal_Sym *sym; | |
2050 | { | |
2051 | if (h != NULL) | |
2052 | { | |
2053 | switch (ELF32_R_TYPE (rel->r_info)) | |
2054 | { | |
2055 | case R_ARM_GNU_VTINHERIT: | |
2056 | case R_ARM_GNU_VTENTRY: | |
2057 | break; | |
2058 | ||
2059 | default: | |
2060 | switch (h->root.type) | |
2061 | { | |
2062 | case bfd_link_hash_defined: | |
2063 | case bfd_link_hash_defweak: | |
2064 | return h->root.u.def.section; | |
2065 | ||
2066 | case bfd_link_hash_common: | |
2067 | return h->root.u.c.p->section; | |
2068 | } | |
2069 | } | |
2070 | } | |
2071 | else | |
2072 | { | |
2073 | if (!(elf_bad_symtab (abfd) | |
2074 | && ELF_ST_BIND (sym->st_info) != STB_LOCAL) | |
2075 | && ! ((sym->st_shndx <= 0 || sym->st_shndx >= SHN_LORESERVE) | |
2076 | && sym->st_shndx != SHN_COMMON)) | |
2077 | { | |
2078 | return bfd_section_from_elf_index (abfd, sym->st_shndx); | |
2079 | } | |
2080 | } | |
2081 | return NULL; | |
2082 | } | |
2083 | ||
780a67af NC |
2084 | /* Update the got entry reference counts for the section being removed. */ |
2085 | ||
252b5132 RH |
2086 | static boolean |
2087 | elf32_arm_gc_sweep_hook (abfd, info, sec, relocs) | |
2088 | bfd *abfd; | |
2089 | struct bfd_link_info *info; | |
2090 | asection *sec; | |
2091 | const Elf_Internal_Rela *relocs; | |
2092 | { | |
780a67af | 2093 | /* We don't support garbage collection of GOT and PLT relocs yet. */ |
252b5132 RH |
2094 | return true; |
2095 | } | |
2096 | ||
780a67af NC |
2097 | /* Look through the relocs for a section during the first phase. */ |
2098 | ||
252b5132 RH |
2099 | static boolean |
2100 | elf32_arm_check_relocs (abfd, info, sec, relocs) | |
2101 | bfd * abfd; | |
2102 | struct bfd_link_info * info; | |
2103 | asection * sec; | |
2104 | const Elf_Internal_Rela * relocs; | |
2105 | { | |
2106 | Elf_Internal_Shdr * symtab_hdr; | |
2107 | struct elf_link_hash_entry ** sym_hashes; | |
2108 | struct elf_link_hash_entry ** sym_hashes_end; | |
2109 | const Elf_Internal_Rela * rel; | |
2110 | const Elf_Internal_Rela * rel_end; | |
2111 | bfd * dynobj; | |
2112 | asection * sgot, *srelgot, *sreloc; | |
2113 | bfd_vma * local_got_offsets; | |
f21f3fe0 | 2114 | |
252b5132 RH |
2115 | if (info->relocateable) |
2116 | return true; | |
f21f3fe0 | 2117 | |
252b5132 | 2118 | sgot = srelgot = sreloc = NULL; |
f21f3fe0 | 2119 | |
252b5132 RH |
2120 | dynobj = elf_hash_table (info)->dynobj; |
2121 | local_got_offsets = elf_local_got_offsets (abfd); | |
f21f3fe0 | 2122 | |
252b5132 RH |
2123 | symtab_hdr = &elf_tdata (abfd)->symtab_hdr; |
2124 | sym_hashes = elf_sym_hashes (abfd); | |
2125 | sym_hashes_end = sym_hashes + symtab_hdr->sh_size/sizeof(Elf32_External_Sym); | |
2126 | if (!elf_bad_symtab (abfd)) | |
2127 | sym_hashes_end -= symtab_hdr->sh_info; | |
f21f3fe0 | 2128 | |
252b5132 RH |
2129 | rel_end = relocs + sec->reloc_count; |
2130 | for (rel = relocs; rel < rel_end; rel++) | |
2131 | { | |
2132 | struct elf_link_hash_entry *h; | |
2133 | unsigned long r_symndx; | |
f21f3fe0 | 2134 | |
252b5132 RH |
2135 | r_symndx = ELF32_R_SYM (rel->r_info); |
2136 | if (r_symndx < symtab_hdr->sh_info) | |
2137 | h = NULL; | |
2138 | else | |
2139 | h = sym_hashes[r_symndx - symtab_hdr->sh_info]; | |
f21f3fe0 | 2140 | |
252b5132 RH |
2141 | /* Some relocs require a global offset table. */ |
2142 | if (dynobj == NULL) | |
2143 | { | |
2144 | switch (ELF32_R_TYPE (rel->r_info)) | |
2145 | { | |
2146 | case R_ARM_GOT32: | |
2147 | case R_ARM_GOTOFF: | |
2148 | case R_ARM_GOTPC: | |
2149 | elf_hash_table (info)->dynobj = dynobj = abfd; | |
2150 | if (! _bfd_elf_create_got_section (dynobj, info)) | |
2151 | return false; | |
2152 | break; | |
2153 | ||
2154 | default: | |
2155 | break; | |
2156 | } | |
2157 | } | |
2158 | ||
2159 | switch (ELF32_R_TYPE (rel->r_info)) | |
2160 | { | |
2161 | case R_ARM_GOT32: | |
2162 | /* This symbol requires a global offset table entry. */ | |
2163 | if (sgot == NULL) | |
2164 | { | |
2165 | sgot = bfd_get_section_by_name (dynobj, ".got"); | |
2166 | BFD_ASSERT (sgot != NULL); | |
2167 | } | |
2168 | ||
2169 | /* Get the got relocation section if necessary. */ | |
2170 | if (srelgot == NULL | |
2171 | && (h != NULL || info->shared)) | |
2172 | { | |
2173 | srelgot = bfd_get_section_by_name (dynobj, ".rel.got"); | |
f21f3fe0 | 2174 | |
252b5132 RH |
2175 | /* If no got relocation section, make one and initialize. */ |
2176 | if (srelgot == NULL) | |
2177 | { | |
2178 | srelgot = bfd_make_section (dynobj, ".rel.got"); | |
2179 | if (srelgot == NULL | |
2180 | || ! bfd_set_section_flags (dynobj, srelgot, | |
2181 | (SEC_ALLOC | |
2182 | | SEC_LOAD | |
2183 | | SEC_HAS_CONTENTS | |
2184 | | SEC_IN_MEMORY | |
2185 | | SEC_LINKER_CREATED | |
2186 | | SEC_READONLY)) | |
2187 | || ! bfd_set_section_alignment (dynobj, srelgot, 2)) | |
2188 | return false; | |
2189 | } | |
2190 | } | |
2191 | ||
2192 | if (h != NULL) | |
2193 | { | |
2194 | if (h->got.offset != (bfd_vma) -1) | |
2195 | /* We have already allocated space in the .got. */ | |
2196 | break; | |
f21f3fe0 | 2197 | |
252b5132 RH |
2198 | h->got.offset = sgot->_raw_size; |
2199 | ||
2200 | /* Make sure this symbol is output as a dynamic symbol. */ | |
2201 | if (h->dynindx == -1) | |
2202 | if (! bfd_elf32_link_record_dynamic_symbol (info, h)) | |
2203 | return false; | |
2204 | ||
2205 | srelgot->_raw_size += sizeof (Elf32_External_Rel); | |
2206 | } | |
2207 | else | |
2208 | { | |
2209 | /* This is a global offset table entry for a local | |
2210 | symbol. */ | |
2211 | if (local_got_offsets == NULL) | |
2212 | { | |
2213 | size_t size; | |
2214 | register unsigned int i; | |
2215 | ||
2216 | size = symtab_hdr->sh_info * sizeof (bfd_vma); | |
2217 | local_got_offsets = (bfd_vma *) bfd_alloc (abfd, size); | |
2218 | if (local_got_offsets == NULL) | |
2219 | return false; | |
2220 | elf_local_got_offsets (abfd) = local_got_offsets; | |
2221 | for (i = 0; i < symtab_hdr->sh_info; i++) | |
2222 | local_got_offsets[i] = (bfd_vma) -1; | |
2223 | } | |
f21f3fe0 | 2224 | |
252b5132 RH |
2225 | if (local_got_offsets[r_symndx] != (bfd_vma) -1) |
2226 | /* We have already allocated space in the .got. */ | |
2227 | break; | |
2228 | ||
2229 | local_got_offsets[r_symndx] = sgot->_raw_size; | |
2230 | ||
2231 | if (info->shared) | |
2232 | /* If we are generating a shared object, we need to | |
2233 | output a R_ARM_RELATIVE reloc so that the dynamic | |
2234 | linker can adjust this GOT entry. */ | |
2235 | srelgot->_raw_size += sizeof (Elf32_External_Rel); | |
2236 | } | |
2237 | ||
2238 | sgot->_raw_size += 4; | |
2239 | break; | |
2240 | ||
2241 | case R_ARM_PLT32: | |
2242 | /* This symbol requires a procedure linkage table entry. We | |
2243 | actually build the entry in adjust_dynamic_symbol, | |
2244 | because this might be a case of linking PIC code which is | |
2245 | never referenced by a dynamic object, in which case we | |
2246 | don't need to generate a procedure linkage table entry | |
2247 | after all. */ | |
2248 | ||
2249 | /* If this is a local symbol, we resolve it directly without | |
2250 | creating a procedure linkage table entry. */ | |
2251 | if (h == NULL) | |
2252 | continue; | |
2253 | ||
2254 | h->elf_link_hash_flags |= ELF_LINK_HASH_NEEDS_PLT; | |
2255 | break; | |
2256 | ||
2257 | case R_ARM_ABS32: | |
2258 | case R_ARM_REL32: | |
2259 | case R_ARM_PC24: | |
2260 | /* If we are creating a shared library, and this is a reloc | |
2261 | against a global symbol, or a non PC relative reloc | |
2262 | against a local symbol, then we need to copy the reloc | |
2263 | into the shared library. However, if we are linking with | |
2264 | -Bsymbolic, we do not need to copy a reloc against a | |
2265 | global symbol which is defined in an object we are | |
2266 | including in the link (i.e., DEF_REGULAR is set). At | |
2267 | this point we have not seen all the input files, so it is | |
2268 | possible that DEF_REGULAR is not set now but will be set | |
2269 | later (it is never cleared). We account for that | |
2270 | possibility below by storing information in the | |
2271 | pcrel_relocs_copied field of the hash table entry. */ | |
2272 | if (info->shared | |
2273 | && (ELF32_R_TYPE (rel->r_info) != R_ARM_PC24 | |
2274 | || (h != NULL | |
2275 | && (! info->symbolic | |
2276 | || (h->elf_link_hash_flags | |
2277 | & ELF_LINK_HASH_DEF_REGULAR) == 0)))) | |
2278 | { | |
2279 | /* When creating a shared object, we must copy these | |
2280 | reloc types into the output file. We create a reloc | |
2281 | section in dynobj and make room for this reloc. */ | |
2282 | if (sreloc == NULL) | |
2283 | { | |
2284 | const char * name; | |
2285 | ||
2286 | name = (bfd_elf_string_from_elf_section | |
2287 | (abfd, | |
2288 | elf_elfheader (abfd)->e_shstrndx, | |
2289 | elf_section_data (sec)->rel_hdr.sh_name)); | |
2290 | if (name == NULL) | |
2291 | return false; | |
2292 | ||
2293 | BFD_ASSERT (strncmp (name, ".rel", 4) == 0 | |
2294 | && strcmp (bfd_get_section_name (abfd, sec), | |
2295 | name + 4) == 0); | |
2296 | ||
2297 | sreloc = bfd_get_section_by_name (dynobj, name); | |
2298 | if (sreloc == NULL) | |
2299 | { | |
2300 | flagword flags; | |
2301 | ||
2302 | sreloc = bfd_make_section (dynobj, name); | |
2303 | flags = (SEC_HAS_CONTENTS | SEC_READONLY | |
2304 | | SEC_IN_MEMORY | SEC_LINKER_CREATED); | |
2305 | if ((sec->flags & SEC_ALLOC) != 0) | |
2306 | flags |= SEC_ALLOC | SEC_LOAD; | |
2307 | if (sreloc == NULL | |
2308 | || ! bfd_set_section_flags (dynobj, sreloc, flags) | |
2309 | || ! bfd_set_section_alignment (dynobj, sreloc, 2)) | |
2310 | return false; | |
2311 | } | |
2312 | } | |
2313 | ||
2314 | sreloc->_raw_size += sizeof (Elf32_External_Rel); | |
2315 | /* If we are linking with -Bsymbolic, and this is a | |
2316 | global symbol, we count the number of PC relative | |
2317 | relocations we have entered for this symbol, so that | |
2318 | we can discard them again if the symbol is later | |
2319 | defined by a regular object. Note that this function | |
2320 | is only called if we are using an elf_i386 linker | |
2321 | hash table, which means that h is really a pointer to | |
2322 | an elf_i386_link_hash_entry. */ | |
2323 | if (h != NULL && info->symbolic | |
2324 | && ELF32_R_TYPE (rel->r_info) == R_ARM_PC24) | |
2325 | { | |
2326 | struct elf32_arm_link_hash_entry * eh; | |
2327 | struct elf32_arm_pcrel_relocs_copied * p; | |
2328 | ||
2329 | eh = (struct elf32_arm_link_hash_entry *) h; | |
2330 | ||
2331 | for (p = eh->pcrel_relocs_copied; p != NULL; p = p->next) | |
2332 | if (p->section == sreloc) | |
2333 | break; | |
2334 | ||
2335 | if (p == NULL) | |
2336 | { | |
2337 | p = ((struct elf32_arm_pcrel_relocs_copied *) | |
2338 | bfd_alloc (dynobj, sizeof * p)); | |
f21f3fe0 | 2339 | |
252b5132 RH |
2340 | if (p == NULL) |
2341 | return false; | |
2342 | p->next = eh->pcrel_relocs_copied; | |
2343 | eh->pcrel_relocs_copied = p; | |
2344 | p->section = sreloc; | |
2345 | p->count = 0; | |
2346 | } | |
2347 | ||
2348 | ++p->count; | |
2349 | } | |
2350 | } | |
2351 | break; | |
2352 | ||
2353 | /* This relocation describes the C++ object vtable hierarchy. | |
2354 | Reconstruct it for later use during GC. */ | |
2355 | case R_ARM_GNU_VTINHERIT: | |
2356 | if (!_bfd_elf32_gc_record_vtinherit (abfd, sec, h, rel->r_offset)) | |
2357 | return false; | |
2358 | break; | |
f21f3fe0 | 2359 | |
252b5132 RH |
2360 | /* This relocation describes which C++ vtable entries are actually |
2361 | used. Record for later use during GC. */ | |
2362 | case R_ARM_GNU_VTENTRY: | |
2363 | if (!_bfd_elf32_gc_record_vtentry (abfd, sec, h, rel->r_addend)) | |
2364 | return false; | |
2365 | break; | |
2366 | } | |
2367 | } | |
f21f3fe0 | 2368 | |
252b5132 RH |
2369 | return true; |
2370 | } | |
2371 | ||
f21f3fe0 | 2372 | |
252b5132 RH |
2373 | /* Find the nearest line to a particular section and offset, for error |
2374 | reporting. This code is a duplicate of the code in elf.c, except | |
2375 | that it also accepts STT_ARM_TFUNC as a symbol that names a function. */ | |
2376 | ||
2377 | static boolean | |
2378 | elf32_arm_find_nearest_line | |
2379 | (abfd, section, symbols, offset, filename_ptr, functionname_ptr, line_ptr) | |
2380 | bfd * abfd; | |
2381 | asection * section; | |
2382 | asymbol ** symbols; | |
2383 | bfd_vma offset; | |
2384 | CONST char ** filename_ptr; | |
2385 | CONST char ** functionname_ptr; | |
2386 | unsigned int * line_ptr; | |
2387 | { | |
2388 | boolean found; | |
2389 | const char * filename; | |
2390 | asymbol * func; | |
2391 | bfd_vma low_func; | |
2392 | asymbol ** p; | |
2393 | ||
2394 | if (_bfd_dwarf2_find_nearest_line (abfd, section, symbols, offset, | |
f21f3fe0 | 2395 | filename_ptr, functionname_ptr, |
252b5132 RH |
2396 | line_ptr)) |
2397 | return true; | |
2398 | ||
2399 | if (! _bfd_stab_section_find_nearest_line (abfd, symbols, section, offset, | |
2400 | &found, filename_ptr, | |
2401 | functionname_ptr, line_ptr, | |
2402 | &elf_tdata (abfd)->line_info)) | |
2403 | return false; | |
f21f3fe0 | 2404 | |
252b5132 RH |
2405 | if (found) |
2406 | return true; | |
2407 | ||
2408 | if (symbols == NULL) | |
2409 | return false; | |
2410 | ||
2411 | filename = NULL; | |
2412 | func = NULL; | |
2413 | low_func = 0; | |
2414 | ||
2415 | for (p = symbols; *p != NULL; p++) | |
2416 | { | |
2417 | elf_symbol_type *q; | |
2418 | ||
2419 | q = (elf_symbol_type *) *p; | |
2420 | ||
2421 | if (bfd_get_section (&q->symbol) != section) | |
2422 | continue; | |
2423 | ||
2424 | switch (ELF_ST_TYPE (q->internal_elf_sym.st_info)) | |
2425 | { | |
2426 | default: | |
2427 | break; | |
2428 | case STT_FILE: | |
2429 | filename = bfd_asymbol_name (&q->symbol); | |
2430 | break; | |
2431 | case STT_NOTYPE: | |
2432 | case STT_FUNC: | |
2433 | case STT_ARM_TFUNC: | |
2434 | if (q->symbol.section == section | |
2435 | && q->symbol.value >= low_func | |
2436 | && q->symbol.value <= offset) | |
2437 | { | |
2438 | func = (asymbol *) q; | |
2439 | low_func = q->symbol.value; | |
2440 | } | |
2441 | break; | |
2442 | } | |
2443 | } | |
2444 | ||
2445 | if (func == NULL) | |
2446 | return false; | |
2447 | ||
2448 | *filename_ptr = filename; | |
2449 | *functionname_ptr = bfd_asymbol_name (func); | |
2450 | *line_ptr = 0; | |
f21f3fe0 | 2451 | |
252b5132 RH |
2452 | return true; |
2453 | } | |
2454 | ||
2455 | /* Adjust a symbol defined by a dynamic object and referenced by a | |
2456 | regular object. The current definition is in some section of the | |
2457 | dynamic object, but we're not including those sections. We have to | |
2458 | change the definition to something the rest of the link can | |
2459 | understand. */ | |
2460 | ||
2461 | static boolean | |
2462 | elf32_arm_adjust_dynamic_symbol (info, h) | |
2463 | struct bfd_link_info * info; | |
2464 | struct elf_link_hash_entry * h; | |
2465 | { | |
2466 | bfd * dynobj; | |
2467 | asection * s; | |
2468 | unsigned int power_of_two; | |
2469 | ||
2470 | dynobj = elf_hash_table (info)->dynobj; | |
2471 | ||
2472 | /* Make sure we know what is going on here. */ | |
2473 | BFD_ASSERT (dynobj != NULL | |
2474 | && ((h->elf_link_hash_flags & ELF_LINK_HASH_NEEDS_PLT) | |
2475 | || h->weakdef != NULL | |
2476 | || ((h->elf_link_hash_flags | |
2477 | & ELF_LINK_HASH_DEF_DYNAMIC) != 0 | |
2478 | && (h->elf_link_hash_flags | |
2479 | & ELF_LINK_HASH_REF_REGULAR) != 0 | |
2480 | && (h->elf_link_hash_flags | |
2481 | & ELF_LINK_HASH_DEF_REGULAR) == 0))); | |
2482 | ||
2483 | /* If this is a function, put it in the procedure linkage table. We | |
2484 | will fill in the contents of the procedure linkage table later, | |
2485 | when we know the address of the .got section. */ | |
2486 | if (h->type == STT_FUNC | |
2487 | || (h->elf_link_hash_flags & ELF_LINK_HASH_NEEDS_PLT) != 0) | |
2488 | { | |
2489 | if (! info->shared | |
2490 | && (h->elf_link_hash_flags & ELF_LINK_HASH_DEF_DYNAMIC) == 0 | |
2491 | && (h->elf_link_hash_flags & ELF_LINK_HASH_REF_DYNAMIC) == 0) | |
2492 | { | |
2493 | /* This case can occur if we saw a PLT32 reloc in an input | |
2494 | file, but the symbol was never referred to by a dynamic | |
2495 | object. In such a case, we don't actually need to build | |
2496 | a procedure linkage table, and we can just do a PC32 | |
2497 | reloc instead. */ | |
2498 | BFD_ASSERT ((h->elf_link_hash_flags & ELF_LINK_HASH_NEEDS_PLT) != 0); | |
2499 | return true; | |
2500 | } | |
2501 | ||
2502 | /* Make sure this symbol is output as a dynamic symbol. */ | |
2503 | if (h->dynindx == -1) | |
2504 | { | |
2505 | if (! bfd_elf32_link_record_dynamic_symbol (info, h)) | |
2506 | return false; | |
2507 | } | |
2508 | ||
2509 | s = bfd_get_section_by_name (dynobj, ".plt"); | |
2510 | BFD_ASSERT (s != NULL); | |
2511 | ||
2512 | /* If this is the first .plt entry, make room for the special | |
2513 | first entry. */ | |
2514 | if (s->_raw_size == 0) | |
2515 | s->_raw_size += PLT_ENTRY_SIZE; | |
2516 | ||
2517 | /* If this symbol is not defined in a regular file, and we are | |
2518 | not generating a shared library, then set the symbol to this | |
2519 | location in the .plt. This is required to make function | |
2520 | pointers compare as equal between the normal executable and | |
2521 | the shared library. */ | |
2522 | if (! info->shared | |
2523 | && (h->elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR) == 0) | |
2524 | { | |
2525 | h->root.u.def.section = s; | |
2526 | h->root.u.def.value = s->_raw_size; | |
2527 | } | |
2528 | ||
2529 | h->plt.offset = s->_raw_size; | |
2530 | ||
2531 | /* Make room for this entry. */ | |
2532 | s->_raw_size += PLT_ENTRY_SIZE; | |
2533 | ||
2534 | /* We also need to make an entry in the .got.plt section, which | |
2535 | will be placed in the .got section by the linker script. */ | |
2536 | ||
2537 | s = bfd_get_section_by_name (dynobj, ".got.plt"); | |
2538 | BFD_ASSERT (s != NULL); | |
2539 | s->_raw_size += 4; | |
2540 | ||
2541 | /* We also need to make an entry in the .rel.plt section. */ | |
2542 | ||
2543 | s = bfd_get_section_by_name (dynobj, ".rel.plt"); | |
2544 | BFD_ASSERT (s != NULL); | |
2545 | s->_raw_size += sizeof (Elf32_External_Rel); | |
2546 | ||
2547 | return true; | |
2548 | } | |
2549 | ||
2550 | /* If this is a weak symbol, and there is a real definition, the | |
2551 | processor independent code will have arranged for us to see the | |
2552 | real definition first, and we can just use the same value. */ | |
2553 | if (h->weakdef != NULL) | |
2554 | { | |
2555 | BFD_ASSERT (h->weakdef->root.type == bfd_link_hash_defined | |
2556 | || h->weakdef->root.type == bfd_link_hash_defweak); | |
2557 | h->root.u.def.section = h->weakdef->root.u.def.section; | |
2558 | h->root.u.def.value = h->weakdef->root.u.def.value; | |
2559 | return true; | |
2560 | } | |
2561 | ||
2562 | /* This is a reference to a symbol defined by a dynamic object which | |
2563 | is not a function. */ | |
2564 | ||
2565 | /* If we are creating a shared library, we must presume that the | |
2566 | only references to the symbol are via the global offset table. | |
2567 | For such cases we need not do anything here; the relocations will | |
2568 | be handled correctly by relocate_section. */ | |
2569 | if (info->shared) | |
2570 | return true; | |
2571 | ||
2572 | /* We must allocate the symbol in our .dynbss section, which will | |
2573 | become part of the .bss section of the executable. There will be | |
2574 | an entry for this symbol in the .dynsym section. The dynamic | |
2575 | object will contain position independent code, so all references | |
2576 | from the dynamic object to this symbol will go through the global | |
2577 | offset table. The dynamic linker will use the .dynsym entry to | |
2578 | determine the address it must put in the global offset table, so | |
2579 | both the dynamic object and the regular object will refer to the | |
2580 | same memory location for the variable. */ | |
2581 | ||
2582 | s = bfd_get_section_by_name (dynobj, ".dynbss"); | |
2583 | BFD_ASSERT (s != NULL); | |
2584 | ||
2585 | /* We must generate a R_ARM_COPY reloc to tell the dynamic linker to | |
2586 | copy the initial value out of the dynamic object and into the | |
2587 | runtime process image. We need to remember the offset into the | |
2588 | .rel.bss section we are going to use. */ | |
2589 | if ((h->root.u.def.section->flags & SEC_ALLOC) != 0) | |
2590 | { | |
2591 | asection *srel; | |
2592 | ||
2593 | srel = bfd_get_section_by_name (dynobj, ".rel.bss"); | |
2594 | BFD_ASSERT (srel != NULL); | |
2595 | srel->_raw_size += sizeof (Elf32_External_Rel); | |
2596 | h->elf_link_hash_flags |= ELF_LINK_HASH_NEEDS_COPY; | |
2597 | } | |
2598 | ||
2599 | /* We need to figure out the alignment required for this symbol. I | |
2600 | have no idea how ELF linkers handle this. */ | |
2601 | power_of_two = bfd_log2 (h->size); | |
2602 | if (power_of_two > 3) | |
2603 | power_of_two = 3; | |
2604 | ||
2605 | /* Apply the required alignment. */ | |
2606 | s->_raw_size = BFD_ALIGN (s->_raw_size, | |
2607 | (bfd_size_type) (1 << power_of_two)); | |
2608 | if (power_of_two > bfd_get_section_alignment (dynobj, s)) | |
2609 | { | |
2610 | if (! bfd_set_section_alignment (dynobj, s, power_of_two)) | |
2611 | return false; | |
2612 | } | |
2613 | ||
2614 | /* Define the symbol as being at this point in the section. */ | |
2615 | h->root.u.def.section = s; | |
2616 | h->root.u.def.value = s->_raw_size; | |
2617 | ||
2618 | /* Increment the section size to make room for the symbol. */ | |
2619 | s->_raw_size += h->size; | |
2620 | ||
2621 | return true; | |
2622 | } | |
2623 | ||
2624 | /* Set the sizes of the dynamic sections. */ | |
2625 | ||
2626 | static boolean | |
2627 | elf32_arm_size_dynamic_sections (output_bfd, info) | |
2628 | bfd * output_bfd; | |
2629 | struct bfd_link_info * info; | |
2630 | { | |
2631 | bfd * dynobj; | |
2632 | asection * s; | |
2633 | boolean plt; | |
2634 | boolean relocs; | |
2635 | boolean reltext; | |
2636 | ||
2637 | dynobj = elf_hash_table (info)->dynobj; | |
2638 | BFD_ASSERT (dynobj != NULL); | |
2639 | ||
2640 | if (elf_hash_table (info)->dynamic_sections_created) | |
2641 | { | |
2642 | /* Set the contents of the .interp section to the interpreter. */ | |
2643 | if (! info->shared) | |
2644 | { | |
2645 | s = bfd_get_section_by_name (dynobj, ".interp"); | |
2646 | BFD_ASSERT (s != NULL); | |
2647 | s->_raw_size = sizeof ELF_DYNAMIC_INTERPRETER; | |
2648 | s->contents = (unsigned char *) ELF_DYNAMIC_INTERPRETER; | |
2649 | } | |
2650 | } | |
2651 | else | |
2652 | { | |
2653 | /* We may have created entries in the .rel.got section. | |
2654 | However, if we are not creating the dynamic sections, we will | |
2655 | not actually use these entries. Reset the size of .rel.got, | |
2656 | which will cause it to get stripped from the output file | |
2657 | below. */ | |
2658 | s = bfd_get_section_by_name (dynobj, ".rel.got"); | |
2659 | if (s != NULL) | |
2660 | s->_raw_size = 0; | |
2661 | } | |
2662 | ||
2663 | /* If this is a -Bsymbolic shared link, then we need to discard all | |
2664 | PC relative relocs against symbols defined in a regular object. | |
2665 | We allocated space for them in the check_relocs routine, but we | |
2666 | will not fill them in in the relocate_section routine. */ | |
2667 | if (info->shared && info->symbolic) | |
2668 | elf32_arm_link_hash_traverse (elf32_arm_hash_table (info), | |
2669 | elf32_arm_discard_copies, | |
2670 | (PTR) NULL); | |
2671 | ||
2672 | /* The check_relocs and adjust_dynamic_symbol entry points have | |
2673 | determined the sizes of the various dynamic sections. Allocate | |
2674 | memory for them. */ | |
2675 | plt = false; | |
2676 | relocs = false; | |
2677 | reltext = false; | |
2678 | for (s = dynobj->sections; s != NULL; s = s->next) | |
2679 | { | |
2680 | const char * name; | |
2681 | boolean strip; | |
2682 | ||
2683 | if ((s->flags & SEC_LINKER_CREATED) == 0) | |
2684 | continue; | |
2685 | ||
2686 | /* It's OK to base decisions on the section name, because none | |
2687 | of the dynobj section names depend upon the input files. */ | |
2688 | name = bfd_get_section_name (dynobj, s); | |
2689 | ||
2690 | strip = false; | |
2691 | ||
2692 | if (strcmp (name, ".plt") == 0) | |
2693 | { | |
2694 | if (s->_raw_size == 0) | |
2695 | { | |
2696 | /* Strip this section if we don't need it; see the | |
2697 | comment below. */ | |
2698 | strip = true; | |
2699 | } | |
2700 | else | |
2701 | { | |
2702 | /* Remember whether there is a PLT. */ | |
2703 | plt = true; | |
2704 | } | |
2705 | } | |
2706 | else if (strncmp (name, ".rel", 4) == 0) | |
2707 | { | |
2708 | if (s->_raw_size == 0) | |
2709 | { | |
2710 | /* If we don't need this section, strip it from the | |
2711 | output file. This is mostly to handle .rel.bss and | |
2712 | .rel.plt. We must create both sections in | |
2713 | create_dynamic_sections, because they must be created | |
2714 | before the linker maps input sections to output | |
2715 | sections. The linker does that before | |
2716 | adjust_dynamic_symbol is called, and it is that | |
2717 | function which decides whether anything needs to go | |
2718 | into these sections. */ | |
2719 | strip = true; | |
2720 | } | |
2721 | else | |
2722 | { | |
2723 | asection * target; | |
2724 | ||
2725 | /* Remember whether there are any reloc sections other | |
2726 | than .rel.plt. */ | |
2727 | if (strcmp (name, ".rel.plt") != 0) | |
2728 | { | |
2729 | const char *outname; | |
2730 | ||
2731 | relocs = true; | |
2732 | ||
2733 | /* If this relocation section applies to a read only | |
2734 | section, then we probably need a DT_TEXTREL | |
2735 | entry. The entries in the .rel.plt section | |
2736 | really apply to the .got section, which we | |
2737 | created ourselves and so know is not readonly. */ | |
2738 | outname = bfd_get_section_name (output_bfd, | |
2739 | s->output_section); | |
2740 | target = bfd_get_section_by_name (output_bfd, outname + 4); | |
2741 | if (target != NULL | |
2742 | && (target->flags & SEC_READONLY) != 0 | |
2743 | && (target->flags & SEC_ALLOC) != 0) | |
2744 | reltext = true; | |
2745 | } | |
2746 | ||
2747 | /* We use the reloc_count field as a counter if we need | |
2748 | to copy relocs into the output file. */ | |
2749 | s->reloc_count = 0; | |
2750 | } | |
2751 | } | |
2752 | else if (strncmp (name, ".got", 4) != 0) | |
2753 | { | |
2754 | /* It's not one of our sections, so don't allocate space. */ | |
2755 | continue; | |
2756 | } | |
2757 | ||
2758 | if (strip) | |
2759 | { | |
2760 | asection ** spp; | |
2761 | ||
2762 | for (spp = &s->output_section->owner->sections; | |
2763 | *spp != s->output_section; | |
2764 | spp = &(*spp)->next) | |
2765 | ; | |
2766 | *spp = s->output_section->next; | |
2767 | --s->output_section->owner->section_count; | |
2768 | ||
2769 | continue; | |
2770 | } | |
2771 | ||
2772 | /* Allocate memory for the section contents. */ | |
2773 | s->contents = (bfd_byte *) bfd_zalloc (dynobj, s->_raw_size); | |
2774 | if (s->contents == NULL && s->_raw_size != 0) | |
2775 | return false; | |
2776 | } | |
2777 | ||
2778 | if (elf_hash_table (info)->dynamic_sections_created) | |
2779 | { | |
2780 | /* Add some entries to the .dynamic section. We fill in the | |
2781 | values later, in elf32_arm_finish_dynamic_sections, but we | |
2782 | must add the entries now so that we get the correct size for | |
2783 | the .dynamic section. The DT_DEBUG entry is filled in by the | |
2784 | dynamic linker and used by the debugger. */ | |
2785 | if (! info->shared) | |
2786 | { | |
2787 | if (! bfd_elf32_add_dynamic_entry (info, DT_DEBUG, 0)) | |
2788 | return false; | |
2789 | } | |
2790 | ||
2791 | if (plt) | |
2792 | { | |
2793 | if (! bfd_elf32_add_dynamic_entry (info, DT_PLTGOT, 0) | |
2794 | || ! bfd_elf32_add_dynamic_entry (info, DT_PLTRELSZ, 0) | |
2795 | || ! bfd_elf32_add_dynamic_entry (info, DT_PLTREL, DT_REL) | |
2796 | || ! bfd_elf32_add_dynamic_entry (info, DT_JMPREL, 0)) | |
2797 | return false; | |
2798 | } | |
2799 | ||
2800 | if (relocs) | |
2801 | { | |
2802 | if (! bfd_elf32_add_dynamic_entry (info, DT_REL, 0) | |
2803 | || ! bfd_elf32_add_dynamic_entry (info, DT_RELSZ, 0) | |
2804 | || ! bfd_elf32_add_dynamic_entry (info, DT_RELENT, | |
2805 | sizeof (Elf32_External_Rel))) | |
2806 | return false; | |
2807 | } | |
2808 | ||
2809 | if (reltext) | |
2810 | { | |
2811 | if (! bfd_elf32_add_dynamic_entry (info, DT_TEXTREL, 0)) | |
2812 | return false; | |
2813 | } | |
2814 | } | |
2815 | ||
2816 | return true; | |
2817 | } | |
2818 | ||
2819 | /* This function is called via elf32_arm_link_hash_traverse if we are | |
2820 | creating a shared object with -Bsymbolic. It discards the space | |
2821 | allocated to copy PC relative relocs against symbols which are | |
2822 | defined in regular objects. We allocated space for them in the | |
2823 | check_relocs routine, but we won't fill them in in the | |
2824 | relocate_section routine. */ | |
2825 | ||
2826 | static boolean | |
2827 | elf32_arm_discard_copies (h, ignore) | |
2828 | struct elf32_arm_link_hash_entry * h; | |
2829 | PTR ignore; | |
2830 | { | |
2831 | struct elf32_arm_pcrel_relocs_copied * s; | |
2832 | ||
2833 | /* We only discard relocs for symbols defined in a regular object. */ | |
2834 | if ((h->root.elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR) == 0) | |
2835 | return true; | |
2836 | ||
2837 | for (s = h->pcrel_relocs_copied; s != NULL; s = s->next) | |
2838 | s->section->_raw_size -= s->count * sizeof (Elf32_External_Rel); | |
2839 | ||
2840 | return true; | |
2841 | } | |
2842 | ||
2843 | /* Finish up dynamic symbol handling. We set the contents of various | |
2844 | dynamic sections here. */ | |
2845 | ||
2846 | static boolean | |
2847 | elf32_arm_finish_dynamic_symbol (output_bfd, info, h, sym) | |
2848 | bfd * output_bfd; | |
2849 | struct bfd_link_info * info; | |
2850 | struct elf_link_hash_entry * h; | |
2851 | Elf_Internal_Sym * sym; | |
2852 | { | |
2853 | bfd * dynobj; | |
2854 | ||
2855 | dynobj = elf_hash_table (info)->dynobj; | |
2856 | ||
2857 | if (h->plt.offset != (bfd_vma) -1) | |
2858 | { | |
2859 | asection * splt; | |
2860 | asection * sgot; | |
2861 | asection * srel; | |
2862 | bfd_vma plt_index; | |
2863 | bfd_vma got_offset; | |
2864 | Elf_Internal_Rel rel; | |
2865 | ||
2866 | /* This symbol has an entry in the procedure linkage table. Set | |
2867 | it up. */ | |
2868 | ||
2869 | BFD_ASSERT (h->dynindx != -1); | |
2870 | ||
2871 | splt = bfd_get_section_by_name (dynobj, ".plt"); | |
2872 | sgot = bfd_get_section_by_name (dynobj, ".got.plt"); | |
2873 | srel = bfd_get_section_by_name (dynobj, ".rel.plt"); | |
2874 | BFD_ASSERT (splt != NULL && sgot != NULL && srel != NULL); | |
2875 | ||
2876 | /* Get the index in the procedure linkage table which | |
2877 | corresponds to this symbol. This is the index of this symbol | |
2878 | in all the symbols for which we are making plt entries. The | |
2879 | first entry in the procedure linkage table is reserved. */ | |
2880 | plt_index = h->plt.offset / PLT_ENTRY_SIZE - 1; | |
2881 | ||
2882 | /* Get the offset into the .got table of the entry that | |
2883 | corresponds to this function. Each .got entry is 4 bytes. | |
2884 | The first three are reserved. */ | |
2885 | got_offset = (plt_index + 3) * 4; | |
2886 | ||
2887 | /* Fill in the entry in the procedure linkage table. */ | |
2888 | memcpy (splt->contents + h->plt.offset, | |
2889 | elf32_arm_plt_entry, | |
2890 | PLT_ENTRY_SIZE); | |
2891 | bfd_put_32 (output_bfd, | |
2892 | (sgot->output_section->vma | |
2893 | + sgot->output_offset | |
f21f3fe0 | 2894 | + got_offset |
252b5132 RH |
2895 | - splt->output_section->vma |
2896 | - splt->output_offset | |
2897 | - h->plt.offset - 12), | |
2898 | splt->contents + h->plt.offset + 12); | |
2899 | ||
2900 | /* Fill in the entry in the global offset table. */ | |
2901 | bfd_put_32 (output_bfd, | |
2902 | (splt->output_section->vma | |
2903 | + splt->output_offset), | |
2904 | sgot->contents + got_offset); | |
2905 | ||
2906 | /* Fill in the entry in the .rel.plt section. */ | |
2907 | rel.r_offset = (sgot->output_section->vma | |
2908 | + sgot->output_offset | |
2909 | + got_offset); | |
2910 | rel.r_info = ELF32_R_INFO (h->dynindx, R_ARM_JUMP_SLOT); | |
2911 | bfd_elf32_swap_reloc_out (output_bfd, &rel, | |
2912 | ((Elf32_External_Rel *) srel->contents | |
2913 | + plt_index)); | |
2914 | ||
2915 | if ((h->elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR) == 0) | |
2916 | { | |
2917 | /* Mark the symbol as undefined, rather than as defined in | |
2918 | the .plt section. Leave the value alone. */ | |
2919 | sym->st_shndx = SHN_UNDEF; | |
2920 | } | |
2921 | } | |
2922 | ||
2923 | if (h->got.offset != (bfd_vma) -1) | |
2924 | { | |
2925 | asection * sgot; | |
2926 | asection * srel; | |
2927 | Elf_Internal_Rel rel; | |
2928 | ||
2929 | /* This symbol has an entry in the global offset table. Set it | |
2930 | up. */ | |
f21f3fe0 | 2931 | |
252b5132 RH |
2932 | sgot = bfd_get_section_by_name (dynobj, ".got"); |
2933 | srel = bfd_get_section_by_name (dynobj, ".rel.got"); | |
2934 | BFD_ASSERT (sgot != NULL && srel != NULL); | |
2935 | ||
2936 | rel.r_offset = (sgot->output_section->vma | |
2937 | + sgot->output_offset | |
2938 | + (h->got.offset &~ 1)); | |
2939 | ||
2940 | /* If this is a -Bsymbolic link, and the symbol is defined | |
2941 | locally, we just want to emit a RELATIVE reloc. The entry in | |
2942 | the global offset table will already have been initialized in | |
2943 | the relocate_section function. */ | |
2944 | if (info->shared | |
2945 | && (info->symbolic || h->dynindx == -1) | |
2946 | && (h->elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR)) | |
2947 | rel.r_info = ELF32_R_INFO (0, R_ARM_RELATIVE); | |
2948 | else | |
2949 | { | |
2950 | bfd_put_32 (output_bfd, (bfd_vma) 0, sgot->contents + h->got.offset); | |
2951 | rel.r_info = ELF32_R_INFO (h->dynindx, R_ARM_GLOB_DAT); | |
2952 | } | |
2953 | ||
2954 | bfd_elf32_swap_reloc_out (output_bfd, &rel, | |
2955 | ((Elf32_External_Rel *) srel->contents | |
2956 | + srel->reloc_count)); | |
2957 | ++srel->reloc_count; | |
2958 | } | |
2959 | ||
2960 | if ((h->elf_link_hash_flags & ELF_LINK_HASH_NEEDS_COPY) != 0) | |
2961 | { | |
2962 | asection * s; | |
2963 | Elf_Internal_Rel rel; | |
2964 | ||
2965 | /* This symbol needs a copy reloc. Set it up. */ | |
2966 | ||
2967 | BFD_ASSERT (h->dynindx != -1 | |
2968 | && (h->root.type == bfd_link_hash_defined | |
2969 | || h->root.type == bfd_link_hash_defweak)); | |
2970 | ||
2971 | s = bfd_get_section_by_name (h->root.u.def.section->owner, | |
2972 | ".rel.bss"); | |
2973 | BFD_ASSERT (s != NULL); | |
2974 | ||
2975 | rel.r_offset = (h->root.u.def.value | |
2976 | + h->root.u.def.section->output_section->vma | |
2977 | + h->root.u.def.section->output_offset); | |
2978 | rel.r_info = ELF32_R_INFO (h->dynindx, R_ARM_COPY); | |
2979 | bfd_elf32_swap_reloc_out (output_bfd, &rel, | |
2980 | ((Elf32_External_Rel *) s->contents | |
2981 | + s->reloc_count)); | |
2982 | ++s->reloc_count; | |
2983 | } | |
2984 | ||
2985 | /* Mark _DYNAMIC and _GLOBAL_OFFSET_TABLE_ as absolute. */ | |
2986 | if (strcmp (h->root.root.string, "_DYNAMIC") == 0 | |
2987 | || strcmp (h->root.root.string, "_GLOBAL_OFFSET_TABLE_") == 0) | |
2988 | sym->st_shndx = SHN_ABS; | |
2989 | ||
2990 | return true; | |
2991 | } | |
2992 | ||
2993 | /* Finish up the dynamic sections. */ | |
2994 | ||
2995 | static boolean | |
2996 | elf32_arm_finish_dynamic_sections (output_bfd, info) | |
2997 | bfd * output_bfd; | |
2998 | struct bfd_link_info * info; | |
2999 | { | |
3000 | bfd * dynobj; | |
3001 | asection * sgot; | |
3002 | asection * sdyn; | |
3003 | ||
3004 | dynobj = elf_hash_table (info)->dynobj; | |
3005 | ||
3006 | sgot = bfd_get_section_by_name (dynobj, ".got.plt"); | |
3007 | BFD_ASSERT (sgot != NULL); | |
3008 | sdyn = bfd_get_section_by_name (dynobj, ".dynamic"); | |
3009 | ||
3010 | if (elf_hash_table (info)->dynamic_sections_created) | |
3011 | { | |
3012 | asection *splt; | |
3013 | Elf32_External_Dyn *dyncon, *dynconend; | |
3014 | ||
3015 | splt = bfd_get_section_by_name (dynobj, ".plt"); | |
3016 | BFD_ASSERT (splt != NULL && sdyn != NULL); | |
3017 | ||
3018 | dyncon = (Elf32_External_Dyn *) sdyn->contents; | |
3019 | dynconend = (Elf32_External_Dyn *) (sdyn->contents + sdyn->_raw_size); | |
3020 | for (; dyncon < dynconend; dyncon++) | |
3021 | { | |
3022 | Elf_Internal_Dyn dyn; | |
3023 | const char * name; | |
3024 | asection * s; | |
3025 | ||
3026 | bfd_elf32_swap_dyn_in (dynobj, dyncon, &dyn); | |
3027 | ||
3028 | switch (dyn.d_tag) | |
3029 | { | |
3030 | default: | |
3031 | break; | |
3032 | ||
3033 | case DT_PLTGOT: | |
3034 | name = ".got"; | |
3035 | goto get_vma; | |
3036 | case DT_JMPREL: | |
3037 | name = ".rel.plt"; | |
3038 | get_vma: | |
3039 | s = bfd_get_section_by_name (output_bfd, name); | |
3040 | BFD_ASSERT (s != NULL); | |
3041 | dyn.d_un.d_ptr = s->vma; | |
3042 | bfd_elf32_swap_dyn_out (output_bfd, &dyn, dyncon); | |
3043 | break; | |
3044 | ||
3045 | case DT_PLTRELSZ: | |
3046 | s = bfd_get_section_by_name (output_bfd, ".rel.plt"); | |
3047 | BFD_ASSERT (s != NULL); | |
3048 | if (s->_cooked_size != 0) | |
3049 | dyn.d_un.d_val = s->_cooked_size; | |
3050 | else | |
3051 | dyn.d_un.d_val = s->_raw_size; | |
3052 | bfd_elf32_swap_dyn_out (output_bfd, &dyn, dyncon); | |
3053 | break; | |
3054 | ||
3055 | case DT_RELSZ: | |
3056 | /* My reading of the SVR4 ABI indicates that the | |
3057 | procedure linkage table relocs (DT_JMPREL) should be | |
3058 | included in the overall relocs (DT_REL). This is | |
3059 | what Solaris does. However, UnixWare can not handle | |
3060 | that case. Therefore, we override the DT_RELSZ entry | |
3061 | here to make it not include the JMPREL relocs. Since | |
3062 | the linker script arranges for .rel.plt to follow all | |
3063 | other relocation sections, we don't have to worry | |
3064 | about changing the DT_REL entry. */ | |
3065 | s = bfd_get_section_by_name (output_bfd, ".rel.plt"); | |
3066 | if (s != NULL) | |
3067 | { | |
3068 | if (s->_cooked_size != 0) | |
3069 | dyn.d_un.d_val -= s->_cooked_size; | |
3070 | else | |
3071 | dyn.d_un.d_val -= s->_raw_size; | |
3072 | } | |
3073 | bfd_elf32_swap_dyn_out (output_bfd, &dyn, dyncon); | |
3074 | break; | |
3075 | } | |
3076 | } | |
3077 | ||
3078 | /* Fill in the first entry in the procedure linkage table. */ | |
3079 | if (splt->_raw_size > 0) | |
3080 | memcpy (splt->contents, elf32_arm_plt0_entry, PLT_ENTRY_SIZE); | |
3081 | ||
3082 | /* UnixWare sets the entsize of .plt to 4, although that doesn't | |
3083 | really seem like the right value. */ | |
3084 | elf_section_data (splt->output_section)->this_hdr.sh_entsize = 4; | |
3085 | } | |
3086 | ||
3087 | /* Fill in the first three entries in the global offset table. */ | |
3088 | if (sgot->_raw_size > 0) | |
3089 | { | |
3090 | if (sdyn == NULL) | |
3091 | bfd_put_32 (output_bfd, (bfd_vma) 0, sgot->contents); | |
3092 | else | |
3093 | bfd_put_32 (output_bfd, | |
3094 | sdyn->output_section->vma + sdyn->output_offset, | |
3095 | sgot->contents); | |
3096 | bfd_put_32 (output_bfd, (bfd_vma) 0, sgot->contents + 4); | |
3097 | bfd_put_32 (output_bfd, (bfd_vma) 0, sgot->contents + 8); | |
3098 | } | |
3099 | ||
3100 | elf_section_data (sgot->output_section)->this_hdr.sh_entsize = 4; | |
3101 | ||
3102 | return true; | |
3103 | } | |
3104 | ||
ba96a88f NC |
3105 | static void |
3106 | elf32_arm_post_process_headers (abfd, link_info) | |
3107 | bfd * abfd; | |
3108 | struct bfd_link_info * link_info; | |
3109 | { | |
3110 | Elf_Internal_Ehdr * i_ehdrp; /* Elf file header, internal form */ | |
3111 | ||
3112 | i_ehdrp = elf_elfheader (abfd); | |
3113 | ||
3114 | i_ehdrp->e_ident[EI_OSABI] = ARM_ELF_OS_ABI_VERSION; | |
3115 | i_ehdrp->e_ident[EI_ABIVERSION] = ARM_ELF_ABI_VERSION; | |
3116 | } | |
3117 | ||
3118 | ||
252b5132 RH |
3119 | #define ELF_ARCH bfd_arch_arm |
3120 | #define ELF_MACHINE_CODE EM_ARM | |
f21f3fe0 | 3121 | #define ELF_MAXPAGESIZE 0x8000 |
252b5132 RH |
3122 | |
3123 | ||
3124 | #define bfd_elf32_bfd_copy_private_bfd_data elf32_arm_copy_private_bfd_data | |
3125 | #define bfd_elf32_bfd_merge_private_bfd_data elf32_arm_merge_private_bfd_data | |
3126 | #define bfd_elf32_bfd_set_private_flags elf32_arm_set_private_flags | |
3127 | #define bfd_elf32_bfd_print_private_bfd_data elf32_arm_print_private_bfd_data | |
3128 | #define bfd_elf32_bfd_link_hash_table_create elf32_arm_link_hash_table_create | |
3129 | #define bfd_elf32_bfd_reloc_type_lookup elf32_arm_reloc_type_lookup | |
3130 | #define bfd_elf32_find_nearest_line elf32_arm_find_nearest_line | |
3131 | ||
3132 | #define elf_backend_get_symbol_type elf32_arm_get_symbol_type | |
3133 | #define elf_backend_gc_mark_hook elf32_arm_gc_mark_hook | |
3134 | #define elf_backend_gc_sweep_hook elf32_arm_gc_sweep_hook | |
3135 | #define elf_backend_check_relocs elf32_arm_check_relocs | |
3136 | #define elf_backend_relocate_section elf32_arm_relocate_section | |
3137 | #define elf_backend_adjust_dynamic_symbol elf32_arm_adjust_dynamic_symbol | |
3138 | #define elf_backend_create_dynamic_sections _bfd_elf_create_dynamic_sections | |
3139 | #define elf_backend_finish_dynamic_symbol elf32_arm_finish_dynamic_symbol | |
3140 | #define elf_backend_finish_dynamic_sections elf32_arm_finish_dynamic_sections | |
3141 | #define elf_backend_size_dynamic_sections elf32_arm_size_dynamic_sections | |
ba96a88f | 3142 | #define elf_backend_post_process_headers elf32_arm_post_process_headers |
252b5132 RH |
3143 | |
3144 | #define elf_backend_can_gc_sections 1 | |
3145 | #define elf_backend_plt_readonly 1 | |
3146 | #define elf_backend_want_got_plt 1 | |
3147 | #define elf_backend_want_plt_sym 0 | |
3148 | ||
3149 | #include "elf32-target.h" |