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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)); | |
32 | static int elf32_arm_get_symbol_type | |
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 | |
37 | PARAMS ((reloc_howto_type *, bfd *, bfd *, asection *, bfd_byte *, Elf_Internal_Rela *, bfd_vma, struct bfd_link_info *, asection *, const char *, unsigned char)); | |
38 | ||
39 | static insn32 insert_thumb_branch | |
40 | PARAMS ((insn32, int)); | |
41 | static struct elf_link_hash_entry *find_thumb_glue | |
42 | PARAMS ((struct bfd_link_info *, CONST char *, bfd *)); | |
43 | static struct elf_link_hash_entry *find_arm_glue | |
44 | PARAMS ((struct bfd_link_info *, CONST char *, bfd *)); | |
45 | static void record_arm_to_thumb_glue | |
46 | PARAMS ((struct bfd_link_info *, struct elf_link_hash_entry *)); | |
47 | static void record_thumb_to_arm_glue | |
48 | PARAMS ((struct bfd_link_info *, struct elf_link_hash_entry *)); | |
49 | ||
50 | /* The linker script knows the section names for placement. | |
51 | The entry_names are used to do simple name mangling on the stubs. | |
52 | Given a function name, and its type, the stub can be found. The | |
53 | name can be changed. The only requirement is the %s be present. | |
54 | */ | |
55 | ||
56 | #define INTERWORK_FLAG( abfd ) (elf_elfheader (abfd)->e_flags & EF_INTERWORK) | |
57 | ||
58 | #define THUMB2ARM_GLUE_SECTION_NAME ".glue_7t" | |
59 | #define THUMB2ARM_GLUE_ENTRY_NAME "__%s_from_thumb" | |
60 | ||
61 | #define ARM2THUMB_GLUE_SECTION_NAME ".glue_7" | |
62 | #define ARM2THUMB_GLUE_ENTRY_NAME "__%s_from_arm" | |
63 | ||
64 | /* The name of the dynamic interpreter. This is put in the .interp | |
65 | section. */ | |
66 | #define ELF_DYNAMIC_INTERPRETER "/usr/lib/ld.so.1" | |
67 | ||
68 | /* The size in bytes of an entry in the procedure linkage table. */ | |
69 | ||
70 | #define PLT_ENTRY_SIZE 16 | |
71 | ||
72 | /* The first entry in a procedure linkage table looks like | |
73 | this. It is set up so that any shared library function that is | |
74 | called before the relocation has been set up calles the dynamic | |
75 | linker first */ | |
76 | ||
77 | static const bfd_byte elf32_arm_plt0_entry [PLT_ENTRY_SIZE] = | |
78 | { | |
79 | 0x04, 0xe0, 0x2d, 0xe5, /* str lr, [sp, #-4]! */ | |
80 | 0x10, 0xe0, 0x9f, 0xe5, /* ldr lr, [pc, #16] */ | |
81 | 0x0e, 0xe0, 0x8f, 0xe0, /* adr lr, pc, lr */ | |
82 | 0x08, 0xf0, 0xbe, 0xe5 /* ldr pc, [lr, #-4] */ | |
83 | }; | |
84 | ||
85 | /* Subsequent entries in a procedure linkage table look like | |
86 | this. */ | |
87 | ||
88 | static const bfd_byte elf32_arm_plt_entry [PLT_ENTRY_SIZE] = | |
89 | { | |
90 | 0x04, 0xc0, 0x9f, 0xe5, /* ldr ip, [pc, #4] */ | |
91 | 0x0c, 0xc0, 0x8f, 0xe0, /* add ip, pc, ip */ | |
92 | 0x00, 0xf0, 0x9c, 0xe5, /* ldr pc, [ip] */ | |
93 | 0x00, 0x00, 0x00, 0x00 /* offset to symbol in got */ | |
94 | }; | |
95 | ||
96 | ||
97 | /* The ARM linker needs to keep track of the number of relocs that it | |
98 | decides to copy in check_relocs for each symbol. This is so that | |
99 | it can discard PC relative relocs if it doesn't need them when | |
100 | linking with -Bsymbolic. We store the information in a field | |
101 | extending the regular ELF linker hash table. */ | |
102 | ||
103 | /* This structure keeps track of the number of PC relative relocs we | |
104 | have copied for a given symbol. */ | |
105 | ||
106 | struct elf32_arm_pcrel_relocs_copied | |
107 | { | |
108 | /* Next section. */ | |
109 | struct elf32_arm_pcrel_relocs_copied * next; | |
110 | /* A section in dynobj. */ | |
111 | asection * section; | |
112 | /* Number of relocs copied in this section. */ | |
113 | bfd_size_type count; | |
114 | }; | |
115 | ||
116 | /* arm ELF linker hash entry. */ | |
117 | ||
118 | struct elf32_arm_link_hash_entry | |
119 | { | |
120 | struct elf_link_hash_entry root; | |
121 | ||
122 | /* Number of PC relative relocs copied for this symbol. */ | |
123 | struct elf32_arm_pcrel_relocs_copied * pcrel_relocs_copied; | |
124 | }; | |
125 | ||
126 | /* Declare this now that the above structures are defined. */ | |
127 | ||
128 | static boolean elf32_arm_discard_copies | |
129 | PARAMS ((struct elf32_arm_link_hash_entry *, PTR)); | |
130 | ||
131 | /* Traverse an arm ELF linker hash table. */ | |
132 | ||
133 | #define elf32_arm_link_hash_traverse(table, func, info) \ | |
134 | (elf_link_hash_traverse \ | |
135 | (&(table)->root, \ | |
136 | (boolean (*) PARAMS ((struct elf_link_hash_entry *, PTR))) (func), \ | |
137 | (info))) | |
138 | ||
139 | /* Get the ARM elf linker hash table from a link_info structure. */ | |
140 | #define elf32_arm_hash_table(info) \ | |
141 | ((struct elf32_arm_link_hash_table *) ((info)->hash)) | |
142 | ||
143 | /* ARM ELF linker hash table */ | |
144 | struct elf32_arm_link_hash_table | |
145 | { | |
146 | /* The main hash table. */ | |
147 | struct elf_link_hash_table root; | |
148 | ||
149 | /* The size in bytes of the section containg the Thumb-to-ARM glue. */ | |
150 | long int thumb_glue_size; | |
151 | ||
152 | /* The size in bytes of the section containg the ARM-to-Thumb glue. */ | |
153 | long int arm_glue_size; | |
154 | ||
155 | /* An arbitary input BFD chosen to hold the glue sections. */ | |
156 | bfd * bfd_of_glue_owner; | |
157 | }; | |
158 | ||
159 | ||
160 | /* Create an ARM elf linker hash table */ | |
161 | ||
162 | static struct bfd_link_hash_table * | |
163 | elf32_arm_link_hash_table_create (abfd) | |
164 | bfd *abfd; | |
165 | { | |
166 | struct elf32_arm_link_hash_table *ret; | |
167 | ||
168 | ret = ((struct elf32_arm_link_hash_table *) | |
169 | bfd_alloc (abfd, sizeof (struct elf32_arm_link_hash_table))); | |
170 | if (ret == (struct elf32_arm_link_hash_table *) NULL) | |
171 | return NULL; | |
172 | ||
173 | if (!_bfd_elf_link_hash_table_init (&ret->root, abfd, | |
174 | _bfd_elf_link_hash_newfunc)) | |
175 | { | |
176 | bfd_release (abfd, ret); | |
177 | return NULL; | |
178 | } | |
179 | ||
180 | ret->thumb_glue_size = 0; | |
181 | ret->arm_glue_size = 0; | |
182 | ret->bfd_of_glue_owner = NULL; | |
183 | ||
184 | return &ret->root.root; | |
185 | } | |
186 | ||
187 | static struct elf_link_hash_entry * | |
188 | find_thumb_glue (link_info, name, input_bfd) | |
189 | struct bfd_link_info *link_info; | |
190 | CONST char *name; | |
191 | bfd *input_bfd; | |
192 | { | |
193 | char *tmp_name; | |
194 | struct elf_link_hash_entry *hash; | |
195 | struct elf32_arm_link_hash_table *hash_table; | |
196 | ||
197 | /* We need a pointer to the armelf specific hash table. */ | |
198 | hash_table = elf32_arm_hash_table (link_info); | |
199 | ||
200 | ||
201 | tmp_name = ((char *) | |
202 | bfd_malloc (strlen (name) + strlen (THUMB2ARM_GLUE_ENTRY_NAME) + 1)); | |
203 | ||
204 | BFD_ASSERT (tmp_name); | |
205 | ||
206 | sprintf (tmp_name, THUMB2ARM_GLUE_ENTRY_NAME, name); | |
207 | ||
208 | hash = elf_link_hash_lookup | |
209 | (&(hash_table)->root, tmp_name, false, false, true); | |
210 | ||
211 | if (hash == NULL) | |
212 | /* xgettext:c-format */ | |
213 | _bfd_error_handler (_ ("%s: unable to find THUMB glue '%s' for `%s'"), | |
214 | bfd_get_filename (input_bfd), tmp_name, name); | |
215 | ||
216 | free (tmp_name); | |
217 | ||
218 | return hash; | |
219 | } | |
220 | ||
221 | static struct elf_link_hash_entry * | |
222 | find_arm_glue (link_info, name, input_bfd) | |
223 | struct bfd_link_info *link_info; | |
224 | CONST char *name; | |
225 | bfd *input_bfd; | |
226 | { | |
227 | char *tmp_name; | |
228 | struct elf_link_hash_entry *myh; | |
229 | struct elf32_arm_link_hash_table *hash_table; | |
230 | ||
231 | /* We need a pointer to the elfarm specific hash table. */ | |
232 | hash_table = elf32_arm_hash_table (link_info); | |
233 | ||
234 | tmp_name = ((char *) | |
235 | bfd_malloc (strlen (name) + strlen (ARM2THUMB_GLUE_ENTRY_NAME) + 1)); | |
236 | ||
237 | BFD_ASSERT (tmp_name); | |
238 | ||
239 | sprintf (tmp_name, ARM2THUMB_GLUE_ENTRY_NAME, name); | |
240 | ||
241 | myh = elf_link_hash_lookup | |
242 | (&(hash_table)->root, tmp_name, false, false, true); | |
243 | ||
244 | if (myh == NULL) | |
245 | /* xgettext:c-format */ | |
246 | _bfd_error_handler (_ ("%s: unable to find ARM glue '%s' for `%s'"), | |
247 | bfd_get_filename (input_bfd), tmp_name, name); | |
248 | ||
249 | free (tmp_name); | |
250 | ||
251 | return myh; | |
252 | } | |
253 | ||
254 | /* | |
255 | ARM->Thumb glue: | |
256 | ||
257 | .arm | |
258 | __func_from_arm: | |
259 | ldr r12, __func_addr | |
260 | bx r12 | |
261 | __func_addr: | |
262 | .word func @ behave as if you saw a ARM_32 reloc | |
263 | */ | |
264 | ||
265 | #define ARM2THUMB_GLUE_SIZE 12 | |
266 | static const insn32 a2t1_ldr_insn = 0xe59fc000; | |
267 | static const insn32 a2t2_bx_r12_insn = 0xe12fff1c; | |
268 | static const insn32 a2t3_func_addr_insn = 0x00000001; | |
269 | ||
270 | /* | |
271 | Thumb->ARM: Thumb->(non-interworking aware) ARM | |
272 | ||
273 | .thumb .thumb | |
274 | .align 2 .align 2 | |
275 | __func_from_thumb: __func_from_thumb: | |
276 | bx pc push {r6, lr} | |
277 | nop ldr r6, __func_addr | |
278 | .arm mov lr, pc | |
279 | __func_change_to_arm: bx r6 | |
280 | b func .arm | |
281 | __func_back_to_thumb: | |
282 | ldmia r13! {r6, lr} | |
283 | bx lr | |
284 | __func_addr: | |
285 | .word func | |
286 | */ | |
287 | ||
288 | #define THUMB2ARM_GLUE_SIZE 8 | |
289 | static const insn16 t2a1_bx_pc_insn = 0x4778; | |
290 | static const insn16 t2a2_noop_insn = 0x46c0; | |
291 | static const insn32 t2a3_b_insn = 0xea000000; | |
292 | ||
293 | static const insn16 t2a1_push_insn = 0xb540; | |
294 | static const insn16 t2a2_ldr_insn = 0x4e03; | |
295 | static const insn16 t2a3_mov_insn = 0x46fe; | |
296 | static const insn16 t2a4_bx_insn = 0x4730; | |
297 | static const insn32 t2a5_pop_insn = 0xe8bd4040; | |
298 | static const insn32 t2a6_bx_insn = 0xe12fff1e; | |
299 | ||
300 | boolean | |
301 | bfd_elf32_arm_allocate_interworking_sections (info) | |
302 | struct bfd_link_info * info; | |
303 | { | |
304 | asection * s; | |
305 | bfd_byte * foo; | |
306 | struct elf32_arm_link_hash_table * globals; | |
307 | ||
308 | globals = elf32_arm_hash_table (info); | |
309 | ||
310 | BFD_ASSERT (globals != NULL); | |
311 | ||
312 | if (globals->arm_glue_size != 0) | |
313 | { | |
314 | BFD_ASSERT (globals->bfd_of_glue_owner != NULL); | |
315 | ||
316 | s = bfd_get_section_by_name | |
317 | (globals->bfd_of_glue_owner, ARM2THUMB_GLUE_SECTION_NAME); | |
318 | ||
319 | BFD_ASSERT (s != NULL); | |
320 | ||
321 | foo = (bfd_byte *) bfd_alloc | |
322 | (globals->bfd_of_glue_owner, globals->arm_glue_size); | |
323 | ||
324 | s->_raw_size = s->_cooked_size = globals->arm_glue_size; | |
325 | s->contents = foo; | |
326 | } | |
327 | ||
328 | if (globals->thumb_glue_size != 0) | |
329 | { | |
330 | BFD_ASSERT (globals->bfd_of_glue_owner != NULL); | |
331 | ||
332 | s = bfd_get_section_by_name | |
333 | (globals->bfd_of_glue_owner, THUMB2ARM_GLUE_SECTION_NAME); | |
334 | ||
335 | BFD_ASSERT (s != NULL); | |
336 | ||
337 | foo = (bfd_byte *) bfd_alloc | |
338 | (globals->bfd_of_glue_owner, globals->thumb_glue_size); | |
339 | ||
340 | s->_raw_size = s->_cooked_size = globals->thumb_glue_size; | |
341 | s->contents = foo; | |
342 | } | |
343 | ||
344 | return true; | |
345 | } | |
346 | ||
347 | static void | |
348 | record_arm_to_thumb_glue (link_info, h) | |
349 | struct bfd_link_info * link_info; | |
350 | struct elf_link_hash_entry * h; | |
351 | { | |
352 | const char * name = h->root.root.string; | |
353 | register asection * s; | |
354 | char * tmp_name; | |
355 | struct elf_link_hash_entry * myh; | |
356 | struct elf32_arm_link_hash_table * globals; | |
357 | ||
358 | globals = elf32_arm_hash_table (link_info); | |
359 | ||
360 | BFD_ASSERT (globals != NULL); | |
361 | BFD_ASSERT (globals->bfd_of_glue_owner != NULL); | |
362 | ||
363 | s = bfd_get_section_by_name | |
364 | (globals->bfd_of_glue_owner, ARM2THUMB_GLUE_SECTION_NAME); | |
365 | ||
366 | ||
367 | BFD_ASSERT (s != NULL); | |
368 | ||
369 | tmp_name = ((char *) | |
370 | bfd_malloc (strlen (name) + strlen (ARM2THUMB_GLUE_ENTRY_NAME) + 1)); | |
371 | ||
372 | BFD_ASSERT (tmp_name); | |
373 | ||
374 | sprintf (tmp_name, ARM2THUMB_GLUE_ENTRY_NAME, name); | |
375 | ||
376 | myh = elf_link_hash_lookup | |
377 | (&(globals)->root, tmp_name, false, false, true); | |
378 | ||
379 | if (myh != NULL) | |
380 | { | |
381 | free (tmp_name); | |
382 | return; /* we've already seen this guy */ | |
383 | } | |
384 | ||
385 | /* The only trick here is using hash_table->arm_glue_size as the value. Even | |
386 | though the section isn't allocated yet, this is where we will be putting | |
387 | it. */ | |
388 | ||
389 | _bfd_generic_link_add_one_symbol (link_info, globals->bfd_of_glue_owner, tmp_name, | |
390 | BSF_GLOBAL, | |
391 | s, globals->arm_glue_size + 1, | |
392 | NULL, true, false, | |
393 | (struct bfd_link_hash_entry **) &myh); | |
394 | ||
395 | free (tmp_name); | |
396 | ||
397 | globals->arm_glue_size += ARM2THUMB_GLUE_SIZE; | |
398 | ||
399 | return; | |
400 | } | |
401 | ||
402 | static void | |
403 | record_thumb_to_arm_glue (link_info, h) | |
404 | struct bfd_link_info *link_info; | |
405 | struct elf_link_hash_entry *h; | |
406 | { | |
407 | const char *name = h->root.root.string; | |
408 | register asection *s; | |
409 | char *tmp_name; | |
410 | struct elf_link_hash_entry *myh; | |
411 | struct elf32_arm_link_hash_table *hash_table; | |
412 | char bind; | |
413 | ||
414 | hash_table = elf32_arm_hash_table (link_info); | |
415 | ||
416 | BFD_ASSERT (hash_table != NULL); | |
417 | BFD_ASSERT (hash_table->bfd_of_glue_owner != NULL); | |
418 | ||
419 | s = bfd_get_section_by_name | |
420 | (hash_table->bfd_of_glue_owner, THUMB2ARM_GLUE_SECTION_NAME); | |
421 | ||
422 | BFD_ASSERT (s != NULL); | |
423 | ||
424 | tmp_name = (char *) bfd_malloc (strlen (name) + strlen (THUMB2ARM_GLUE_ENTRY_NAME) + 1); | |
425 | ||
426 | BFD_ASSERT (tmp_name); | |
427 | ||
428 | sprintf (tmp_name, THUMB2ARM_GLUE_ENTRY_NAME, name); | |
429 | ||
430 | myh = elf_link_hash_lookup | |
431 | (&(hash_table)->root, tmp_name, false, false, true); | |
432 | ||
433 | if (myh != NULL) | |
434 | { | |
435 | free (tmp_name); | |
436 | return; /* we've already seen this guy */ | |
437 | } | |
438 | ||
439 | _bfd_generic_link_add_one_symbol (link_info, hash_table->bfd_of_glue_owner, tmp_name, | |
440 | BSF_GLOBAL, s, hash_table->thumb_glue_size + 1, | |
441 | NULL, true, false, | |
442 | (struct bfd_link_hash_entry **) &myh); | |
443 | ||
444 | /* If we mark it 'thumb', the disassembler will do a better job. */ | |
445 | bind = ELF_ST_BIND (myh->type); | |
446 | myh->type = ELF_ST_INFO (bind, STT_ARM_TFUNC); | |
447 | ||
448 | free (tmp_name); | |
449 | ||
450 | /* Allocate another symbol to mark where we switch to arm mode. */ | |
451 | ||
452 | #define CHANGE_TO_ARM "__%s_change_to_arm" | |
453 | #define BACK_FROM_ARM "__%s_back_from_arm" | |
454 | ||
455 | tmp_name = (char *) bfd_malloc (strlen (name) + strlen (CHANGE_TO_ARM) + 1); | |
456 | ||
457 | BFD_ASSERT (tmp_name); | |
458 | ||
459 | sprintf (tmp_name, CHANGE_TO_ARM, name); | |
460 | ||
461 | myh = NULL; | |
462 | ||
463 | _bfd_generic_link_add_one_symbol (link_info, hash_table->bfd_of_glue_owner, tmp_name, | |
464 | BSF_LOCAL, s, hash_table->thumb_glue_size + 4, | |
465 | NULL, true, false, | |
466 | (struct bfd_link_hash_entry **) &myh); | |
467 | ||
468 | free (tmp_name); | |
469 | ||
470 | hash_table->thumb_glue_size += THUMB2ARM_GLUE_SIZE; | |
471 | ||
472 | return; | |
473 | } | |
474 | ||
475 | /* Select a BFD to be used to hold the sections used by the glue code. | |
476 | This function is called from the linker scripts in ld/emultempl/ | |
477 | {armelf/pe}.em */ | |
478 | boolean | |
479 | bfd_elf32_arm_get_bfd_for_interworking (abfd, info) | |
480 | bfd *abfd; | |
481 | struct bfd_link_info *info; | |
482 | { | |
483 | struct elf32_arm_link_hash_table *globals; | |
484 | flagword flags; | |
485 | asection *sec; | |
486 | ||
487 | /* If we are only performing a partial link do not bother | |
488 | getting a bfd to hold the glue. */ | |
489 | if (info->relocateable) | |
490 | return true; | |
491 | ||
492 | globals = elf32_arm_hash_table (info); | |
493 | ||
494 | BFD_ASSERT (globals != NULL); | |
495 | ||
496 | if (globals->bfd_of_glue_owner != NULL) | |
497 | return true; | |
498 | ||
499 | sec = bfd_get_section_by_name (abfd, ARM2THUMB_GLUE_SECTION_NAME); | |
500 | ||
501 | if (sec == NULL) | |
502 | { | |
503 | flags = SEC_ALLOC | SEC_LOAD | SEC_HAS_CONTENTS | SEC_IN_MEMORY; | |
504 | ||
505 | sec = bfd_make_section (abfd, ARM2THUMB_GLUE_SECTION_NAME); | |
506 | ||
507 | if (sec == NULL | |
508 | || !bfd_set_section_flags (abfd, sec, flags) | |
509 | || !bfd_set_section_alignment (abfd, sec, 2)) | |
510 | return false; | |
511 | } | |
512 | ||
513 | sec = bfd_get_section_by_name (abfd, THUMB2ARM_GLUE_SECTION_NAME); | |
514 | ||
515 | if (sec == NULL) | |
516 | { | |
517 | flags = SEC_ALLOC | SEC_LOAD | SEC_HAS_CONTENTS | SEC_IN_MEMORY; | |
518 | ||
519 | sec = bfd_make_section (abfd, THUMB2ARM_GLUE_SECTION_NAME); | |
520 | ||
521 | if (sec == NULL | |
522 | || !bfd_set_section_flags (abfd, sec, flags) | |
523 | || !bfd_set_section_alignment (abfd, sec, 2)) | |
524 | return false; | |
525 | } | |
526 | ||
527 | /* Save the bfd for later use. */ | |
528 | globals->bfd_of_glue_owner = abfd; | |
529 | ||
530 | return true; | |
531 | } | |
532 | ||
533 | boolean | |
534 | bfd_elf32_arm_process_before_allocation (abfd, link_info) | |
535 | bfd *abfd; | |
536 | struct bfd_link_info *link_info; | |
537 | { | |
538 | Elf_Internal_Shdr *symtab_hdr; | |
539 | Elf_Internal_Rela *free_relocs = NULL; | |
540 | Elf_Internal_Rela *irel, *irelend; | |
541 | bfd_byte *contents = NULL; | |
542 | bfd_byte *free_contents = NULL; | |
543 | Elf32_External_Sym *extsyms = NULL; | |
544 | Elf32_External_Sym *free_extsyms = NULL; | |
545 | ||
546 | asection *sec; | |
547 | struct elf32_arm_link_hash_table *globals; | |
548 | ||
549 | /* If we are only performing a partial link do not bother | |
550 | to construct any glue. */ | |
551 | if (link_info->relocateable) | |
552 | return true; | |
553 | ||
554 | /* Here we have a bfd that is to be included on the link. We have a hook | |
555 | to do reloc rummaging, before section sizes are nailed down. */ | |
556 | ||
557 | globals = elf32_arm_hash_table (link_info); | |
558 | ||
559 | BFD_ASSERT (globals != NULL); | |
560 | BFD_ASSERT (globals->bfd_of_glue_owner != NULL); | |
561 | ||
562 | /* Rummage around all the relocs and map the glue vectors. */ | |
563 | sec = abfd->sections; | |
564 | ||
565 | if (sec == NULL) | |
566 | return true; | |
567 | ||
568 | for (; sec != NULL; sec = sec->next) | |
569 | { | |
570 | if (sec->reloc_count == 0) | |
571 | continue; | |
572 | ||
573 | symtab_hdr = &elf_tdata (abfd)->symtab_hdr; | |
574 | /* Load the relocs. */ | |
575 | ||
576 | irel = (_bfd_elf32_link_read_relocs (abfd, sec, (PTR) NULL, | |
577 | (Elf_Internal_Rela *) NULL, false)); | |
578 | ||
579 | BFD_ASSERT (irel != 0); | |
580 | ||
581 | irelend = irel + sec->reloc_count; | |
582 | for (; irel < irelend; irel++) | |
583 | { | |
584 | long r_type; | |
585 | unsigned long r_index; | |
586 | unsigned char code; | |
587 | ||
588 | struct elf_link_hash_entry *h; | |
589 | ||
590 | r_type = ELF32_R_TYPE (irel->r_info); | |
591 | r_index = ELF32_R_SYM (irel->r_info); | |
592 | ||
593 | /* These are the only relocation types we care about */ | |
594 | if (r_type != R_ARM_PC24 | |
595 | && r_type != R_ARM_THM_PC22) | |
596 | continue; | |
597 | ||
598 | /* Get the section contents if we haven't done so already. */ | |
599 | if (contents == NULL) | |
600 | { | |
601 | /* Get cached copy if it exists. */ | |
602 | if (elf_section_data (sec)->this_hdr.contents != NULL) | |
603 | contents = elf_section_data (sec)->this_hdr.contents; | |
604 | else | |
605 | { | |
606 | /* Go get them off disk. */ | |
607 | contents = (bfd_byte *) bfd_malloc (sec->_raw_size); | |
608 | if (contents == NULL) | |
609 | goto error_return; | |
610 | free_contents = contents; | |
611 | ||
612 | if (!bfd_get_section_contents (abfd, sec, contents, | |
613 | (file_ptr) 0, sec->_raw_size)) | |
614 | goto error_return; | |
615 | } | |
616 | } | |
617 | ||
618 | /* Read this BFD's symbols if we haven't done so already. */ | |
619 | if (extsyms == NULL) | |
620 | { | |
621 | /* Get cached copy if it exists. */ | |
622 | if (symtab_hdr->contents != NULL) | |
623 | extsyms = (Elf32_External_Sym *) symtab_hdr->contents; | |
624 | else | |
625 | { | |
626 | /* Go get them off disk. */ | |
627 | extsyms = ((Elf32_External_Sym *) | |
628 | bfd_malloc (symtab_hdr->sh_size)); | |
629 | if (extsyms == NULL) | |
630 | goto error_return; | |
631 | free_extsyms = extsyms; | |
632 | if (bfd_seek (abfd, symtab_hdr->sh_offset, SEEK_SET) != 0 | |
633 | || (bfd_read (extsyms, 1, symtab_hdr->sh_size, abfd) | |
634 | != symtab_hdr->sh_size)) | |
635 | goto error_return; | |
636 | } | |
637 | } | |
638 | ||
639 | /* If the relocation is not against a symbol it cannot concern us. */ | |
640 | ||
641 | h = NULL; | |
642 | ||
643 | /* We don't care about local symbols */ | |
644 | if (r_index < symtab_hdr->sh_info) | |
645 | continue; | |
646 | ||
647 | /* This is an external symbol */ | |
648 | r_index -= symtab_hdr->sh_info; | |
649 | h = (struct elf_link_hash_entry *) | |
650 | elf_sym_hashes (abfd)[r_index]; | |
651 | ||
652 | /* If the relocation is against a static symbol it must be within | |
653 | the current section and so cannot be a cross ARM/Thumb relocation. */ | |
654 | if (h == NULL) | |
655 | continue; | |
656 | ||
657 | switch (r_type) | |
658 | { | |
659 | case R_ARM_PC24: | |
660 | /* This one is a call from arm code. We need to look up | |
661 | the target of the call. If it is a thumb target, we | |
662 | insert glue. */ | |
663 | ||
664 | if (ELF_ST_TYPE(h->type) == STT_ARM_TFUNC) | |
665 | record_arm_to_thumb_glue (link_info, h); | |
666 | break; | |
667 | ||
668 | case R_ARM_THM_PC22: | |
669 | /* This one is a call from thumb code. We look | |
670 | up the target of the call. If it is not a thumb | |
671 | target, we insert glue. */ | |
672 | ||
673 | if (ELF_ST_TYPE (h->type) != STT_ARM_TFUNC) | |
674 | record_thumb_to_arm_glue (link_info, h); | |
675 | break; | |
676 | ||
677 | default: | |
678 | break; | |
679 | } | |
680 | } | |
681 | } | |
682 | ||
683 | return true; | |
684 | error_return: | |
685 | if (free_relocs != NULL) | |
686 | free (free_relocs); | |
687 | if (free_contents != NULL) | |
688 | free (free_contents); | |
689 | if (free_extsyms != NULL) | |
690 | free (free_extsyms); | |
691 | return false; | |
692 | ||
693 | } | |
694 | ||
695 | /* The thumb form of a long branch is a bit finicky, because the offset | |
696 | encoding is split over two fields, each in it's own instruction. They | |
697 | can occur in any order. So given a thumb form of long branch, and an | |
698 | offset, insert the offset into the thumb branch and return finished | |
699 | instruction. | |
700 | ||
701 | It takes two thumb instructions to encode the target address. Each has | |
702 | 11 bits to invest. The upper 11 bits are stored in one (identifed by | |
703 | H-0.. see below), the lower 11 bits are stored in the other (identified | |
704 | by H-1). | |
705 | ||
706 | Combine together and shifted left by 1 (it's a half word address) and | |
707 | there you have it. | |
708 | ||
709 | Op: 1111 = F, | |
710 | H-0, upper address-0 = 000 | |
711 | Op: 1111 = F, | |
712 | H-1, lower address-0 = 800 | |
713 | ||
714 | They can be ordered either way, but the arm tools I've seen always put | |
715 | the lower one first. It probably doesn't matter. krk@cygnus.com | |
716 | ||
717 | XXX: Actually the order does matter. The second instruction (H-1) | |
718 | moves the computed address into the PC, so it must be the second one | |
719 | in the sequence. The problem, however is that whilst little endian code | |
720 | stores the instructions in HI then LOW order, big endian code does the | |
721 | reverse. nickc@cygnus.com */ | |
722 | ||
723 | #define LOW_HI_ORDER 0xF800F000 | |
724 | #define HI_LOW_ORDER 0xF000F800 | |
725 | ||
726 | static insn32 | |
727 | insert_thumb_branch (br_insn, rel_off) | |
728 | insn32 br_insn; | |
729 | int rel_off; | |
730 | { | |
731 | unsigned int low_bits; | |
732 | unsigned int high_bits; | |
733 | ||
734 | ||
735 | BFD_ASSERT ((rel_off & 1) != 1); | |
736 | ||
737 | rel_off >>= 1; /* half word aligned address */ | |
738 | low_bits = rel_off & 0x000007FF; /* the bottom 11 bits */ | |
739 | high_bits = (rel_off >> 11) & 0x000007FF; /* the top 11 bits */ | |
740 | ||
741 | if ((br_insn & LOW_HI_ORDER) == LOW_HI_ORDER) | |
742 | br_insn = LOW_HI_ORDER | (low_bits << 16) | high_bits; | |
743 | else if ((br_insn & HI_LOW_ORDER) == HI_LOW_ORDER) | |
744 | br_insn = HI_LOW_ORDER | (high_bits << 16) | low_bits; | |
745 | else | |
746 | abort (); /* error - not a valid branch instruction form */ | |
747 | ||
748 | /* FIXME: abort is probably not the right call. krk@cygnus.com */ | |
749 | ||
750 | return br_insn; | |
751 | } | |
752 | ||
753 | /* Thumb code calling an ARM function */ | |
754 | static int | |
755 | elf32_thumb_to_arm_stub (info, name, input_bfd, output_bfd, input_section, | |
756 | hit_data, sym_sec, offset, addend, val) | |
757 | struct bfd_link_info *info; | |
758 | char *name; | |
759 | bfd *input_bfd; | |
760 | bfd *output_bfd; | |
761 | asection *input_section; | |
762 | bfd_byte *hit_data; | |
763 | asection *sym_sec; | |
764 | int offset; | |
765 | int addend; | |
766 | bfd_vma val; | |
767 | { | |
768 | asection *s = 0; | |
769 | long int my_offset; | |
770 | unsigned long int tmp; | |
771 | long int ret_offset; | |
772 | struct elf_link_hash_entry *myh; | |
773 | struct elf32_arm_link_hash_table *globals; | |
774 | ||
775 | myh = find_thumb_glue (info, name, input_bfd); | |
776 | if (myh == NULL) | |
777 | return false; | |
778 | ||
779 | globals = elf32_arm_hash_table (info); | |
780 | ||
781 | BFD_ASSERT (globals != NULL); | |
782 | BFD_ASSERT (globals->bfd_of_glue_owner != NULL); | |
783 | ||
784 | my_offset = myh->root.u.def.value; | |
785 | ||
786 | s = bfd_get_section_by_name (globals->bfd_of_glue_owner, | |
787 | THUMB2ARM_GLUE_SECTION_NAME); | |
788 | ||
789 | BFD_ASSERT (s != NULL); | |
790 | BFD_ASSERT (s->contents != NULL); | |
791 | BFD_ASSERT (s->output_section != NULL); | |
792 | ||
793 | if ((my_offset & 0x01) == 0x01) | |
794 | { | |
795 | if (sym_sec != NULL | |
796 | && sym_sec->owner != NULL | |
797 | && !INTERWORK_FLAG (sym_sec->owner)) | |
798 | { | |
799 | _bfd_error_handler | |
800 | (_ ("%s(%s): warning: interworking not enabled."), | |
801 | bfd_get_filename (sym_sec->owner), name); | |
802 | _bfd_error_handler | |
803 | (_ (" first occurrence: %s: thumb call to arm"), | |
804 | bfd_get_filename (input_bfd)); | |
805 | ||
806 | return false; | |
807 | } | |
808 | ||
809 | --my_offset; | |
810 | myh->root.u.def.value = my_offset; | |
811 | ||
812 | bfd_put_16 (output_bfd, t2a1_bx_pc_insn, | |
813 | s->contents + my_offset); | |
814 | ||
815 | bfd_put_16 (output_bfd, t2a2_noop_insn, | |
816 | s->contents + my_offset + 2); | |
817 | ||
818 | ret_offset = | |
819 | ((bfd_signed_vma) val) /* Address of destination of the stub */ | |
820 | - ((bfd_signed_vma) | |
821 | (s->output_offset /* Offset from the start of the current section to the start of the stubs. */ | |
822 | + my_offset /* Offset of the start of this stub from the start of the stubs. */ | |
823 | + s->output_section->vma) /* Address of the start of the current section. */ | |
824 | + 4 /* The branch instruction is 4 bytes into the stub. */ | |
825 | + 8); /* ARM branches work from the pc of the instruction + 8. */ | |
826 | ||
827 | bfd_put_32 (output_bfd, | |
828 | t2a3_b_insn | ((ret_offset >> 2) & 0x00FFFFFF), | |
829 | s->contents + my_offset + 4); | |
830 | } | |
831 | ||
832 | BFD_ASSERT (my_offset <= globals->thumb_glue_size); | |
833 | ||
834 | /* Now go back and fix up the original BL insn to point | |
835 | to here. */ | |
836 | ret_offset = | |
837 | s->output_offset | |
838 | + my_offset | |
839 | - (input_section->output_offset | |
840 | + offset + addend) | |
841 | - 4; | |
842 | ||
843 | tmp = bfd_get_32 (input_bfd, hit_data | |
844 | - input_section->vma); | |
845 | ||
846 | bfd_put_32 (output_bfd, | |
847 | insert_thumb_branch (tmp, ret_offset), | |
848 | hit_data - input_section->vma); | |
849 | ||
850 | return true; | |
851 | } | |
852 | ||
853 | /* Arm code calling a Thumb function */ | |
854 | static int | |
855 | elf32_arm_to_thumb_stub (info, name, input_bfd, output_bfd, input_section, | |
856 | hit_data, sym_sec, offset, addend, val) | |
857 | ||
858 | struct bfd_link_info *info; | |
859 | char *name; | |
860 | bfd *input_bfd; | |
861 | bfd *output_bfd; | |
862 | asection *input_section; | |
863 | bfd_byte *hit_data; | |
864 | asection *sym_sec; | |
865 | int offset; | |
866 | int addend; | |
867 | bfd_vma val; | |
868 | { | |
869 | unsigned long int tmp; | |
870 | long int my_offset; | |
871 | asection *s; | |
872 | long int ret_offset; | |
873 | struct elf_link_hash_entry *myh; | |
874 | struct elf32_arm_link_hash_table *globals; | |
875 | ||
876 | myh = find_arm_glue (info, name, input_bfd); | |
877 | if (myh == NULL) | |
878 | return false; | |
879 | ||
880 | globals = elf32_arm_hash_table (info); | |
881 | ||
882 | BFD_ASSERT (globals != NULL); | |
883 | BFD_ASSERT (globals->bfd_of_glue_owner != NULL); | |
884 | ||
885 | my_offset = myh->root.u.def.value; | |
886 | s = bfd_get_section_by_name (globals->bfd_of_glue_owner, | |
887 | ARM2THUMB_GLUE_SECTION_NAME); | |
888 | BFD_ASSERT (s != NULL); | |
889 | BFD_ASSERT (s->contents != NULL); | |
890 | BFD_ASSERT (s->output_section != NULL); | |
891 | ||
892 | if ((my_offset & 0x01) == 0x01) | |
893 | { | |
894 | if (sym_sec != NULL | |
895 | && sym_sec->owner != NULL | |
896 | && !INTERWORK_FLAG (sym_sec->owner)) | |
897 | { | |
898 | _bfd_error_handler | |
899 | (_ ("%s(%s): warning: interworking not enabled."), | |
900 | bfd_get_filename (sym_sec->owner), name); | |
901 | _bfd_error_handler | |
902 | (_ (" first occurrence: %s: arm call to thumb"), | |
903 | bfd_get_filename (input_bfd)); | |
904 | } | |
905 | --my_offset; | |
906 | myh->root.u.def.value = my_offset; | |
907 | ||
908 | bfd_put_32 (output_bfd, a2t1_ldr_insn, | |
909 | s->contents + my_offset); | |
910 | ||
911 | bfd_put_32 (output_bfd, a2t2_bx_r12_insn, | |
912 | s->contents + my_offset + 4); | |
913 | ||
914 | /* It's a thumb address. Add the low order bit. */ | |
915 | bfd_put_32 (output_bfd, val | a2t3_func_addr_insn, | |
916 | s->contents + my_offset + 8); | |
917 | } | |
918 | ||
919 | BFD_ASSERT (my_offset <= globals->arm_glue_size); | |
920 | ||
921 | tmp = bfd_get_32 (input_bfd, hit_data); | |
922 | tmp = tmp & 0xFF000000; | |
923 | ||
924 | /* Somehow these are both 4 too far, so subtract 8. */ | |
925 | ret_offset = s->output_offset | |
926 | + my_offset | |
927 | + s->output_section->vma | |
928 | - (input_section->output_offset | |
929 | + input_section->output_section->vma | |
930 | + offset + addend) | |
931 | - 8; | |
932 | ||
933 | tmp = tmp | ((ret_offset >> 2) & 0x00FFFFFF); | |
934 | ||
935 | bfd_put_32 (output_bfd, tmp, hit_data | |
936 | - input_section->vma); | |
937 | ||
938 | ||
939 | return true; | |
940 | } | |
941 | ||
942 | /* Perform a relocation as part of a final link. */ | |
943 | static bfd_reloc_status_type | |
944 | elf32_arm_final_link_relocate (howto, input_bfd, output_bfd, | |
945 | input_section, contents, rel, value, | |
946 | info, sym_sec, sym_name, sym_flags) | |
947 | reloc_howto_type * howto; | |
948 | bfd * input_bfd; | |
949 | bfd * output_bfd; | |
950 | asection * input_section; | |
951 | bfd_byte * contents; | |
952 | Elf_Internal_Rela * rel; | |
953 | bfd_vma value; | |
954 | struct bfd_link_info * info; | |
955 | asection * sym_sec; | |
956 | const char * sym_name; | |
957 | unsigned char sym_flags; | |
958 | { | |
959 | unsigned long r_type = howto->type; | |
960 | unsigned long r_symndx; | |
961 | bfd_byte * hit_data = contents + rel->r_offset; | |
962 | bfd * dynobj = NULL; | |
963 | Elf_Internal_Shdr * symtab_hdr; | |
964 | struct elf_link_hash_entry ** sym_hashes; | |
965 | bfd_vma * local_got_offsets; | |
966 | asection * sgot = NULL; | |
967 | asection * splt = NULL; | |
968 | asection * sreloc = NULL; | |
969 | struct elf_link_hash_entry * h = NULL; | |
970 | bfd_vma addend; | |
971 | ||
972 | dynobj = elf_hash_table (info)->dynobj; | |
973 | if (dynobj) | |
974 | { | |
975 | sgot = bfd_get_section_by_name (dynobj, ".got"); | |
976 | splt = bfd_get_section_by_name (dynobj, ".plt"); | |
977 | } | |
978 | symtab_hdr = & elf_tdata (input_bfd)->symtab_hdr; | |
979 | sym_hashes = elf_sym_hashes (input_bfd); | |
980 | local_got_offsets = elf_local_got_offsets (input_bfd); | |
981 | r_symndx = ELF32_R_SYM (rel->r_info); | |
982 | ||
983 | #ifdef USE_REL | |
984 | addend = (bfd_get_32 (input_bfd, hit_data) & howto->src_mask); | |
985 | #else | |
986 | addend = rel->r_addend; | |
987 | #endif | |
988 | ||
989 | switch (r_type) | |
990 | { | |
991 | case R_ARM_NONE: | |
992 | return bfd_reloc_ok; | |
993 | ||
994 | case R_ARM_PC24: | |
995 | case R_ARM_ABS32: | |
996 | case R_ARM_REL32: | |
997 | /* When generating a shared object, these relocations are copied | |
998 | into the output file to be resolved at run time. */ | |
999 | ||
1000 | if (info->shared | |
1001 | && (r_type != R_ARM_PC24 | |
1002 | || (h != NULL | |
1003 | && h->dynindx != -1 | |
1004 | && (! info->symbolic | |
1005 | || (h->elf_link_hash_flags | |
1006 | & ELF_LINK_HASH_DEF_REGULAR) == 0)))) | |
1007 | { | |
1008 | Elf_Internal_Rel outrel; | |
1009 | boolean skip, relocate; | |
1010 | ||
1011 | if (sreloc == NULL) | |
1012 | { | |
1013 | const char * name; | |
1014 | ||
1015 | name = (bfd_elf_string_from_elf_section | |
1016 | (input_bfd, | |
1017 | elf_elfheader (input_bfd)->e_shstrndx, | |
1018 | elf_section_data (input_section)->rel_hdr.sh_name)); | |
1019 | if (name == NULL) | |
1020 | return bfd_reloc_notsupported; | |
1021 | ||
1022 | BFD_ASSERT (strncmp (name, ".rel", 4) == 0 | |
1023 | && strcmp (bfd_get_section_name (input_bfd, | |
1024 | input_section), | |
1025 | name + 4) == 0); | |
1026 | ||
1027 | sreloc = bfd_get_section_by_name (dynobj, name); | |
1028 | BFD_ASSERT (sreloc != NULL); | |
1029 | } | |
1030 | ||
1031 | skip = false; | |
1032 | ||
1033 | if (elf_section_data (input_section)->stab_info == NULL) | |
1034 | outrel.r_offset = rel->r_offset; | |
1035 | else | |
1036 | { | |
1037 | bfd_vma off; | |
1038 | ||
1039 | off = (_bfd_stab_section_offset | |
1040 | (output_bfd, &elf_hash_table (info)->stab_info, | |
1041 | input_section, | |
1042 | & elf_section_data (input_section)->stab_info, | |
1043 | rel->r_offset)); | |
1044 | if (off == (bfd_vma) -1) | |
1045 | skip = true; | |
1046 | outrel.r_offset = off; | |
1047 | } | |
1048 | ||
1049 | outrel.r_offset += (input_section->output_section->vma | |
1050 | + input_section->output_offset); | |
1051 | ||
1052 | if (skip) | |
1053 | { | |
1054 | memset (&outrel, 0, sizeof outrel); | |
1055 | relocate = false; | |
1056 | } | |
1057 | else if (r_type == R_ARM_PC24) | |
1058 | { | |
1059 | BFD_ASSERT (h != NULL && h->dynindx != -1); | |
1060 | if ((input_section->flags & SEC_ALLOC) != 0) | |
1061 | relocate = false; | |
1062 | else | |
1063 | relocate = true; | |
1064 | outrel.r_info = ELF32_R_INFO (h->dynindx, R_ARM_PC24); | |
1065 | } | |
1066 | else | |
1067 | { | |
1068 | if (h == NULL | |
1069 | || ((info->symbolic || h->dynindx == -1) | |
1070 | && (h->elf_link_hash_flags | |
1071 | & ELF_LINK_HASH_DEF_REGULAR) != 0)) | |
1072 | { | |
1073 | relocate = true; | |
1074 | outrel.r_info = ELF32_R_INFO (0, R_ARM_RELATIVE); | |
1075 | } | |
1076 | else | |
1077 | { | |
1078 | BFD_ASSERT (h->dynindx != -1); | |
1079 | if ((input_section->flags & SEC_ALLOC) != 0) | |
1080 | relocate = false; | |
1081 | else | |
1082 | relocate = true; | |
1083 | outrel.r_info = ELF32_R_INFO (h->dynindx, R_ARM_ABS32); | |
1084 | } | |
1085 | } | |
1086 | ||
1087 | bfd_elf32_swap_reloc_out (output_bfd, &outrel, | |
1088 | (((Elf32_External_Rel *) | |
1089 | sreloc->contents) | |
1090 | + sreloc->reloc_count)); | |
1091 | ++sreloc->reloc_count; | |
1092 | ||
1093 | /* If this reloc is against an external symbol, we do not want to | |
1094 | fiddle with the addend. Otherwise, we need to include the symbol | |
1095 | value so that it becomes an addend for the dynamic reloc. */ | |
1096 | if (! relocate) | |
1097 | return bfd_reloc_ok; | |
1098 | ||
1099 | return _bfd_final_link_relocate (howto, input_bfd, input_section, | |
1100 | contents, rel->r_offset, value, | |
1101 | (bfd_vma) 0); | |
1102 | } | |
1103 | else switch (r_type) | |
1104 | { | |
1105 | case R_ARM_PC24: | |
1106 | /* Arm B/BL instruction */ | |
1107 | ||
1108 | /* Check for arm calling thumb function. */ | |
1109 | if (sym_flags == STT_ARM_TFUNC) | |
1110 | { | |
1111 | elf32_arm_to_thumb_stub (info, sym_name, input_bfd, output_bfd, | |
1112 | input_section, hit_data, sym_sec, rel->r_offset, addend, value); | |
1113 | return bfd_reloc_ok; | |
1114 | } | |
1115 | ||
1116 | value = value + addend; | |
1117 | value -= (input_section->output_section->vma | |
1118 | + input_section->output_offset + 8); | |
1119 | value -= rel->r_offset; | |
1120 | value = value >> howto->rightshift; | |
1121 | ||
1122 | value &= 0xffffff; | |
1123 | value |= (bfd_get_32 (input_bfd, hit_data) & 0xff000000); | |
1124 | break; | |
1125 | ||
1126 | case R_ARM_ABS32: | |
1127 | value += addend; | |
1128 | if (sym_flags == STT_ARM_TFUNC) | |
1129 | value |= 1; | |
1130 | break; | |
1131 | ||
1132 | case R_ARM_REL32: | |
1133 | value -= (input_section->output_section->vma | |
1134 | + input_section->output_offset); | |
1135 | value += addend; | |
1136 | break; | |
1137 | } | |
1138 | ||
1139 | bfd_put_32 (input_bfd, value, hit_data); | |
1140 | return bfd_reloc_ok; | |
1141 | ||
1142 | case R_ARM_ABS8: | |
1143 | value += addend; | |
1144 | if ((long) value > 0x7f || (long) value < -0x80) | |
1145 | return bfd_reloc_overflow; | |
1146 | ||
1147 | bfd_put_8 (input_bfd, value, hit_data); | |
1148 | return bfd_reloc_ok; | |
1149 | ||
1150 | case R_ARM_ABS16: | |
1151 | value += addend; | |
1152 | ||
1153 | if ((long) value > 0x7fff || (long) value < -0x8000) | |
1154 | return bfd_reloc_overflow; | |
1155 | ||
1156 | bfd_put_16 (input_bfd, value, hit_data); | |
1157 | return bfd_reloc_ok; | |
1158 | ||
1159 | case R_ARM_ABS12: | |
1160 | /* Support ldr and str instruction for the arm */ | |
1161 | /* Also thumb b (unconditional branch). ??? Really? */ | |
1162 | value += addend; | |
1163 | ||
1164 | if ((long) value > 0x7ff || (long) value < -0x800) | |
1165 | return bfd_reloc_overflow; | |
1166 | ||
1167 | value |= (bfd_get_32 (input_bfd, hit_data) & 0xfffff000); | |
1168 | bfd_put_32 (input_bfd, value, hit_data); | |
1169 | return bfd_reloc_ok; | |
1170 | ||
1171 | case R_ARM_THM_ABS5: | |
1172 | /* Support ldr and str instructions for the thumb. */ | |
1173 | #ifdef USE_REL | |
1174 | /* Need to refetch addend. */ | |
1175 | addend = bfd_get_16 (input_bfd, hit_data) & howto->src_mask; | |
1176 | /* ??? Need to determine shift amount from operand size. */ | |
1177 | addend >>= howto->rightshift; | |
1178 | #endif | |
1179 | value += addend; | |
1180 | ||
1181 | /* ??? Isn't value unsigned? */ | |
1182 | if ((long) value > 0x1f || (long) value < -0x10) | |
1183 | return bfd_reloc_overflow; | |
1184 | ||
1185 | /* ??? Value needs to be properly shifted into place first. */ | |
1186 | value |= bfd_get_16 (input_bfd, hit_data) & 0xf83f; | |
1187 | bfd_put_16 (input_bfd, value, hit_data); | |
1188 | return bfd_reloc_ok; | |
1189 | ||
1190 | case R_ARM_THM_PC22: | |
1191 | /* Thumb BL (branch long instruction). */ | |
1192 | { | |
1193 | bfd_vma relocation; | |
1194 | boolean overflow = false; | |
1195 | bfd_vma upper_insn = bfd_get_16 (input_bfd, hit_data); | |
1196 | bfd_vma lower_insn = bfd_get_16 (input_bfd, hit_data + 2); | |
1197 | bfd_vma src_mask = 0x007FFFFE; | |
1198 | bfd_signed_vma reloc_signed_max = (1 << (howto->bitsize - 1)) - 1; | |
1199 | bfd_signed_vma reloc_signed_min = ~reloc_signed_max; | |
1200 | bfd_vma check; | |
1201 | bfd_signed_vma signed_check; | |
1202 | bfd_vma add; | |
1203 | bfd_signed_vma signed_add; | |
1204 | ||
1205 | #ifdef USE_REL | |
1206 | /* Need to refetch the addend and squish the two 11 bit pieces | |
1207 | together. */ | |
1208 | { | |
1209 | bfd_vma upper = bfd_get_16 (input_bfd, hit_data) & 0x7ff; | |
1210 | bfd_vma lower = bfd_get_16 (input_bfd, hit_data + 2) & 0x7ff; | |
1211 | upper = (upper ^ 0x400) - 0x400; /* sign extend */ | |
1212 | addend = (upper << 12) | (lower << 1); | |
1213 | } | |
1214 | #endif | |
1215 | ||
1216 | /* If it's not a call to thumb, assume call to arm */ | |
1217 | if (sym_flags != STT_ARM_TFUNC) | |
1218 | { | |
1219 | if (elf32_thumb_to_arm_stub | |
1220 | (info, sym_name, input_bfd, output_bfd, input_section, | |
1221 | hit_data, sym_sec, rel->r_offset, addend, value)) | |
1222 | return bfd_reloc_ok; | |
1223 | else | |
1224 | return bfd_reloc_dangerous; | |
1225 | } | |
1226 | ||
1227 | /* +4: pc is offset by 4 */ | |
1228 | relocation = value + addend + 4; | |
1229 | relocation -= (input_section->output_section->vma | |
1230 | + input_section->output_offset); | |
1231 | relocation -= rel->r_offset; | |
1232 | ||
1233 | check = relocation >> howto->rightshift; | |
1234 | ||
1235 | /* If this is a signed value, the rightshift just dropped | |
1236 | leading 1 bits (assuming twos complement). */ | |
1237 | if ((bfd_signed_vma) relocation >= 0) | |
1238 | signed_check = check; | |
1239 | else | |
1240 | signed_check = check | ~((bfd_vma) -1 >> howto->rightshift); | |
1241 | ||
1242 | add = ((upper_insn & 0x7ff) << 12) | ((lower_insn & 0x7ff) << 1); | |
1243 | /* sign extend */ | |
1244 | signed_add = (add ^ 0x400000) - 0x400000; | |
1245 | ||
1246 | /* Add the value from the object file. */ | |
1247 | signed_check += signed_add; | |
1248 | relocation += signed_add; | |
1249 | ||
1250 | /* Assumes two's complement. */ | |
1251 | if (signed_check > reloc_signed_max | |
1252 | || signed_check < reloc_signed_min) | |
1253 | overflow = true; | |
1254 | ||
1255 | /* Put RELOCATION back into the insn. */ | |
1256 | upper_insn = (upper_insn & ~(bfd_vma) 0x7ff) | ((relocation >> 12) & 0x7ff); | |
1257 | lower_insn = (lower_insn & ~(bfd_vma) 0x7ff) | ((relocation >> 1) & 0x7ff); | |
1258 | ||
1259 | /* Put the relocated value back in the object file: */ | |
1260 | bfd_put_16 (input_bfd, upper_insn, hit_data); | |
1261 | bfd_put_16 (input_bfd, lower_insn, hit_data + 2); | |
1262 | ||
1263 | return (overflow ? bfd_reloc_overflow : bfd_reloc_ok); | |
1264 | } | |
1265 | break; | |
1266 | ||
1267 | case R_ARM_GNU_VTINHERIT: | |
1268 | case R_ARM_GNU_VTENTRY: | |
1269 | return bfd_reloc_ok; | |
1270 | ||
1271 | case R_ARM_COPY: | |
1272 | return bfd_reloc_notsupported; | |
1273 | ||
1274 | case R_ARM_GLOB_DAT: | |
1275 | return bfd_reloc_notsupported; | |
1276 | ||
1277 | case R_ARM_JUMP_SLOT: | |
1278 | return bfd_reloc_notsupported; | |
1279 | ||
1280 | case R_ARM_RELATIVE: | |
1281 | return bfd_reloc_notsupported; | |
1282 | ||
1283 | case R_ARM_GOTOFF: | |
1284 | /* Relocation is relative to the start of the | |
1285 | global offset table. */ | |
1286 | ||
1287 | BFD_ASSERT (sgot != NULL); | |
1288 | if (sgot == NULL) | |
1289 | return bfd_reloc_notsupported; | |
1290 | ||
1291 | /* Note that sgot->output_offset is not involved in this | |
1292 | calculation. We always want the start of .got. If we | |
1293 | define _GLOBAL_OFFSET_TABLE in a different way, as is | |
1294 | permitted by the ABI, we might have to change this | |
1295 | calculation. */ | |
1296 | ||
1297 | value -= sgot->output_section->vma; | |
1298 | return _bfd_final_link_relocate (howto, input_bfd, input_section, | |
1299 | contents, rel->r_offset, value, | |
1300 | (bfd_vma) 0); | |
1301 | ||
1302 | case R_ARM_GOTPC: | |
1303 | /* Use global offset table as symbol value. */ | |
1304 | ||
1305 | BFD_ASSERT (sgot != NULL); | |
1306 | ||
1307 | if (sgot == NULL) | |
1308 | return bfd_reloc_notsupported; | |
1309 | ||
1310 | value = sgot->output_section->vma; | |
1311 | return _bfd_final_link_relocate (howto, input_bfd, input_section, | |
1312 | contents, rel->r_offset, value, | |
1313 | (bfd_vma) 0); | |
1314 | ||
1315 | case R_ARM_GOT32: | |
1316 | /* Relocation is to the entry for this symbol in the | |
1317 | global offset table. */ | |
1318 | if (sgot == NULL) | |
1319 | return bfd_reloc_notsupported; | |
1320 | ||
1321 | if (h != NULL) | |
1322 | { | |
1323 | bfd_vma off; | |
1324 | ||
1325 | off = h->got.offset; | |
1326 | BFD_ASSERT (off != (bfd_vma) -1); | |
1327 | ||
1328 | if (!elf_hash_table (info)->dynamic_sections_created || | |
1329 | (info->shared && (info->symbolic || h->dynindx == -1) | |
1330 | && (h->elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR))) | |
1331 | { | |
1332 | /* This is actually a static link, or it is a -Bsymbolic link | |
1333 | and the symbol is defined locally. We must initialize this | |
1334 | entry in the global offset table. Since the offset must | |
1335 | always be a multiple of 4, we use the least significant bit | |
1336 | to record whether we have initialized it already. | |
1337 | ||
1338 | When doing a dynamic link, we create a .rel.got relocation | |
1339 | entry to initialize the value. This is done in the | |
1340 | finish_dynamic_symbol routine. */ | |
1341 | ||
1342 | if ((off & 1) != 0) | |
1343 | off &= ~1; | |
1344 | else | |
1345 | { | |
1346 | bfd_put_32 (output_bfd, value, sgot->contents + off); | |
1347 | h->got.offset |= 1; | |
1348 | } | |
1349 | } | |
1350 | ||
1351 | value = sgot->output_offset + off; | |
1352 | } | |
1353 | else | |
1354 | { | |
1355 | bfd_vma off; | |
1356 | ||
1357 | BFD_ASSERT (local_got_offsets != NULL && | |
1358 | local_got_offsets[r_symndx] != (bfd_vma) -1); | |
1359 | ||
1360 | off = local_got_offsets[r_symndx]; | |
1361 | ||
1362 | /* The offset must always be a multiple of 4. We use the | |
1363 | least significant bit to record whether we have already | |
1364 | generated the necessary reloc. */ | |
1365 | if ((off & 1) != 0) | |
1366 | off &= ~1; | |
1367 | else | |
1368 | { | |
1369 | bfd_put_32 (output_bfd, value, sgot->contents + off); | |
1370 | ||
1371 | if (info->shared) | |
1372 | { | |
1373 | asection * srelgot; | |
1374 | Elf_Internal_Rel outrel; | |
1375 | ||
1376 | srelgot = bfd_get_section_by_name (dynobj, ".rel.got"); | |
1377 | BFD_ASSERT (srelgot != NULL); | |
1378 | ||
1379 | outrel.r_offset = (sgot->output_section->vma | |
1380 | + sgot->output_offset | |
1381 | + off); | |
1382 | outrel.r_info = ELF32_R_INFO (0, R_ARM_RELATIVE); | |
1383 | bfd_elf32_swap_reloc_out (output_bfd, &outrel, | |
1384 | (((Elf32_External_Rel *) | |
1385 | srelgot->contents) | |
1386 | + srelgot->reloc_count)); | |
1387 | ++srelgot->reloc_count; | |
1388 | } | |
1389 | ||
1390 | local_got_offsets[r_symndx] |= 1; | |
1391 | } | |
1392 | ||
1393 | value = sgot->output_offset + off; | |
1394 | } | |
1395 | ||
1396 | return _bfd_final_link_relocate (howto, input_bfd, input_section, | |
1397 | contents, rel->r_offset, value, | |
1398 | (bfd_vma) 0); | |
1399 | ||
1400 | case R_ARM_PLT32: | |
1401 | /* Relocation is to the entry for this symbol in the | |
1402 | procedure linkage table. */ | |
1403 | ||
1404 | /* Resolve a PLT32 reloc against a local symbol directly, | |
1405 | without using the procedure linkage table. */ | |
1406 | if (h == NULL) | |
1407 | return _bfd_final_link_relocate (howto, input_bfd, input_section, | |
1408 | contents, rel->r_offset, value, | |
1409 | (bfd_vma) 0); | |
1410 | ||
1411 | if (h->plt.offset == (bfd_vma) -1) | |
1412 | /* We didn't make a PLT entry for this symbol. This | |
1413 | happens when statically linking PIC code, or when | |
1414 | using -Bsymbolic. */ | |
1415 | return _bfd_final_link_relocate (howto, input_bfd, input_section, | |
1416 | contents, rel->r_offset, value, | |
1417 | (bfd_vma) 0); | |
1418 | ||
1419 | BFD_ASSERT(splt != NULL); | |
1420 | if (splt == NULL) | |
1421 | return bfd_reloc_notsupported; | |
1422 | ||
1423 | value = (splt->output_section->vma | |
1424 | + splt->output_offset | |
1425 | + h->plt.offset); | |
1426 | return _bfd_final_link_relocate (howto, input_bfd, input_section, | |
1427 | contents, rel->r_offset, value, | |
1428 | (bfd_vma) 0); | |
1429 | ||
1430 | case R_ARM_SBREL32: | |
1431 | return bfd_reloc_notsupported; | |
1432 | ||
1433 | case R_ARM_AMP_VCALL9: | |
1434 | return bfd_reloc_notsupported; | |
1435 | ||
1436 | case R_ARM_RSBREL32: | |
1437 | return bfd_reloc_notsupported; | |
1438 | ||
1439 | case R_ARM_THM_RPC22: | |
1440 | return bfd_reloc_notsupported; | |
1441 | ||
1442 | case R_ARM_RREL32: | |
1443 | return bfd_reloc_notsupported; | |
1444 | ||
1445 | case R_ARM_RABS32: | |
1446 | return bfd_reloc_notsupported; | |
1447 | ||
1448 | case R_ARM_RPC24: | |
1449 | return bfd_reloc_notsupported; | |
1450 | ||
1451 | case R_ARM_RBASE: | |
1452 | return bfd_reloc_notsupported; | |
1453 | ||
1454 | default: | |
1455 | return bfd_reloc_notsupported; | |
1456 | } | |
1457 | } | |
1458 | ||
1459 | ||
1460 | /* Relocate an ARM ELF section. */ | |
1461 | static boolean | |
1462 | elf32_arm_relocate_section (output_bfd, info, input_bfd, input_section, | |
1463 | contents, relocs, local_syms, local_sections) | |
1464 | bfd * output_bfd; | |
1465 | struct bfd_link_info * info; | |
1466 | bfd * input_bfd; | |
1467 | asection * input_section; | |
1468 | bfd_byte * contents; | |
1469 | Elf_Internal_Rela * relocs; | |
1470 | Elf_Internal_Sym * local_syms; | |
1471 | asection ** local_sections; | |
1472 | { | |
1473 | Elf_Internal_Shdr * symtab_hdr; | |
1474 | struct elf_link_hash_entry ** sym_hashes; | |
1475 | Elf_Internal_Rela * rel; | |
1476 | Elf_Internal_Rela * relend; | |
1477 | const char * name; | |
1478 | ||
1479 | symtab_hdr = & elf_tdata (input_bfd)->symtab_hdr; | |
1480 | sym_hashes = elf_sym_hashes (input_bfd); | |
1481 | ||
1482 | rel = relocs; | |
1483 | relend = relocs + input_section->reloc_count; | |
1484 | for (; rel < relend; rel++) | |
1485 | { | |
1486 | int r_type; | |
1487 | reloc_howto_type * howto; | |
1488 | unsigned long r_symndx; | |
1489 | Elf_Internal_Sym * sym; | |
1490 | asection * sec; | |
1491 | struct elf_link_hash_entry * h; | |
1492 | bfd_vma relocation; | |
1493 | bfd_reloc_status_type r; | |
1494 | ||
1495 | r_symndx = ELF32_R_SYM (rel->r_info); | |
1496 | r_type = ELF32_R_TYPE (rel->r_info); | |
1497 | ||
1498 | if (r_type == R_ARM_GNU_VTENTRY | |
1499 | || r_type == R_ARM_GNU_VTINHERIT ) | |
1500 | continue; | |
1501 | ||
1502 | /* ScottB: range check r_type here. */ | |
1503 | ||
1504 | howto = elf32_arm_howto_table + r_type; | |
1505 | ||
1506 | if (info->relocateable) | |
1507 | { | |
1508 | /* This is a relocateable link. We don't have to change | |
1509 | anything, unless the reloc is against a section symbol, | |
1510 | in which case we have to adjust according to where the | |
1511 | section symbol winds up in the output section. */ | |
1512 | if (r_symndx < symtab_hdr->sh_info) | |
1513 | { | |
1514 | sym = local_syms + r_symndx; | |
1515 | if (ELF_ST_TYPE (sym->st_info) == STT_SECTION) | |
1516 | { | |
1517 | sec = local_sections[r_symndx]; | |
1518 | #ifdef USE_REL | |
1519 | { | |
1520 | bfd_vma val; | |
1521 | val = bfd_get_32 (input_bfd, contents + rel->r_offset); | |
1522 | val += (sec->output_offset + sym->st_value) >> howto->rightshift; | |
1523 | bfd_put_32 (input_bfd, val, contents + rel->r_offset); | |
1524 | } | |
1525 | #else | |
1526 | rel->r_addend += (sec->output_offset + sym->st_value) | |
1527 | >> howto->rightshift; | |
1528 | #endif | |
1529 | } | |
1530 | } | |
1531 | ||
1532 | continue; | |
1533 | } | |
1534 | ||
1535 | /* This is a final link. */ | |
1536 | h = NULL; | |
1537 | sym = NULL; | |
1538 | sec = NULL; | |
1539 | if (r_symndx < symtab_hdr->sh_info) | |
1540 | { | |
1541 | sym = local_syms + r_symndx; | |
1542 | sec = local_sections[r_symndx]; | |
1543 | relocation = (sec->output_section->vma | |
1544 | + sec->output_offset | |
1545 | + sym->st_value); | |
1546 | } | |
1547 | else | |
1548 | { | |
1549 | h = sym_hashes[r_symndx - symtab_hdr->sh_info]; | |
1550 | while (h->root.type == bfd_link_hash_indirect | |
1551 | || h->root.type == bfd_link_hash_warning) | |
1552 | h = (struct elf_link_hash_entry *) h->root.u.i.link; | |
1553 | if (h->root.type == bfd_link_hash_defined | |
1554 | || h->root.type == bfd_link_hash_defweak) | |
1555 | { | |
1556 | sec = h->root.u.def.section; | |
1557 | ||
1558 | relocation = (h->root.u.def.value | |
1559 | + sec->output_section->vma | |
1560 | + sec->output_offset); | |
1561 | ||
1562 | /* In these cases, we don't need the relocation value. | |
1563 | We check specially because in some obscure cases | |
1564 | sec->output_section will be NULL. */ | |
1565 | switch (r_type) | |
1566 | { | |
1567 | case R_ARM_PC24: | |
1568 | case R_ARM_ABS32: | |
1569 | if (info->shared | |
1570 | && ( | |
1571 | (!info->symbolic && h->dynindx != -1) | |
97eaf9de | 1572 | || (h->elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR) == 0 |
252b5132 RH |
1573 | ) |
1574 | && ((input_section->flags & SEC_ALLOC) != 0) | |
1575 | ) | |
1576 | relocation = 0; | |
1577 | break; | |
1578 | ||
1579 | case R_ARM_GOTPC: | |
1580 | relocation = 0; | |
1581 | break; | |
1582 | ||
1583 | case R_ARM_GOT32: | |
1584 | if (elf_hash_table(info)->dynamic_sections_created | |
1585 | && (!info->shared | |
1586 | || (!info->symbolic && h->dynindx != -1) | |
1587 | || (h->elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR) == 0 | |
1588 | ) | |
1589 | ) | |
1590 | relocation = 0; | |
1591 | break; | |
1592 | ||
1593 | case R_ARM_PLT32: | |
1594 | if (h->plt.offset != (bfd_vma)-1) | |
1595 | relocation = 0; | |
1596 | break; | |
1597 | ||
1598 | default: | |
1599 | if (sec->output_section == NULL) | |
1600 | { | |
1601 | (*_bfd_error_handler) | |
1602 | (_("%s: warning: unresolvable relocation against symbol `%s' from %s section"), | |
1603 | bfd_get_filename (input_bfd), h->root.root.string, | |
1604 | bfd_get_section_name (input_bfd, input_section)); | |
1605 | relocation = 0; | |
1606 | } | |
1607 | } | |
1608 | } | |
1609 | else if (h->root.type == bfd_link_hash_undefweak) | |
1610 | relocation = 0; | |
1611 | else | |
1612 | { | |
1613 | if (!((*info->callbacks->undefined_symbol) | |
1614 | (info, h->root.root.string, input_bfd, | |
1615 | input_section, rel->r_offset))) | |
1616 | return false; | |
1617 | relocation = 0; | |
1618 | } | |
1619 | } | |
1620 | ||
1621 | if (h != NULL) | |
1622 | name = h->root.root.string; | |
1623 | else | |
1624 | { | |
1625 | name = (bfd_elf_string_from_elf_section | |
1626 | (input_bfd, symtab_hdr->sh_link, sym->st_name)); | |
1627 | if (name == NULL || *name == '\0') | |
1628 | name = bfd_section_name (input_bfd, sec); | |
1629 | } | |
1630 | ||
1631 | r = elf32_arm_final_link_relocate (howto, input_bfd, output_bfd, | |
1632 | input_section, contents, rel, | |
1633 | relocation, info, sec, name, | |
1634 | (h ? ELF_ST_TYPE (h->type) : | |
1635 | ELF_ST_TYPE (sym->st_info))); | |
1636 | ||
1637 | if (r != bfd_reloc_ok) | |
1638 | { | |
1639 | const char * msg = (const char *) 0; | |
1640 | ||
1641 | switch (r) | |
1642 | { | |
1643 | case bfd_reloc_overflow: | |
1644 | if (!((*info->callbacks->reloc_overflow) | |
1645 | (info, name, howto->name, (bfd_vma) 0, | |
1646 | input_bfd, input_section, rel->r_offset))) | |
1647 | return false; | |
1648 | break; | |
1649 | ||
1650 | case bfd_reloc_undefined: | |
1651 | if (!((*info->callbacks->undefined_symbol) | |
1652 | (info, name, input_bfd, input_section, | |
1653 | rel->r_offset))) | |
1654 | return false; | |
1655 | break; | |
1656 | ||
1657 | case bfd_reloc_outofrange: | |
1658 | msg = _ ("internal error: out of range error"); | |
1659 | goto common_error; | |
1660 | ||
1661 | case bfd_reloc_notsupported: | |
1662 | msg = _ ("internal error: unsupported relocation error"); | |
1663 | goto common_error; | |
1664 | ||
1665 | case bfd_reloc_dangerous: | |
1666 | msg = _ ("internal error: dangerous error"); | |
1667 | goto common_error; | |
1668 | ||
1669 | default: | |
1670 | msg = _ ("internal error: unknown error"); | |
1671 | /* fall through */ | |
1672 | ||
1673 | common_error: | |
1674 | if (!((*info->callbacks->warning) | |
1675 | (info, msg, name, input_bfd, input_section, | |
1676 | rel->r_offset))) | |
1677 | return false; | |
1678 | break; | |
1679 | } | |
1680 | } | |
1681 | } | |
1682 | ||
1683 | return true; | |
1684 | } | |
1685 | ||
1686 | /* Function to keep ARM specific flags in the ELF header. */ | |
1687 | static boolean | |
1688 | elf32_arm_set_private_flags (abfd, flags) | |
1689 | bfd *abfd; | |
1690 | flagword flags; | |
1691 | { | |
1692 | if (elf_flags_init (abfd) | |
1693 | && elf_elfheader (abfd)->e_flags != flags) | |
1694 | { | |
1695 | if (flags & EF_INTERWORK) | |
1696 | _bfd_error_handler (_ ("\ | |
1697 | Warning: Not setting interwork flag of %s since it has already been specified as non-interworking"), | |
1698 | bfd_get_filename (abfd)); | |
1699 | else | |
1700 | _bfd_error_handler (_ ("\ | |
1701 | Warning: Clearing the interwork flag of %s due to outside request"), | |
1702 | bfd_get_filename (abfd)); | |
1703 | } | |
1704 | else | |
1705 | { | |
1706 | elf_elfheader (abfd)->e_flags = flags; | |
1707 | elf_flags_init (abfd) = true; | |
1708 | } | |
1709 | ||
1710 | return true; | |
1711 | } | |
1712 | ||
1713 | /* Copy backend specific data from one object module to another */ | |
1714 | static boolean | |
1715 | elf32_arm_copy_private_bfd_data (ibfd, obfd) | |
1716 | bfd *ibfd; | |
1717 | bfd *obfd; | |
1718 | { | |
1719 | flagword in_flags; | |
1720 | flagword out_flags; | |
1721 | ||
1722 | if (bfd_get_flavour (ibfd) != bfd_target_elf_flavour | |
1723 | || bfd_get_flavour (obfd) != bfd_target_elf_flavour) | |
1724 | return true; | |
1725 | ||
1726 | in_flags = elf_elfheader (ibfd)->e_flags; | |
1727 | out_flags = elf_elfheader (obfd)->e_flags; | |
1728 | ||
1729 | if (elf_flags_init (obfd) && in_flags != out_flags) | |
1730 | { | |
1731 | /* Cannot mix PIC and non-PIC code. */ | |
1732 | if ((in_flags & EF_PIC) != (out_flags & EF_PIC)) | |
1733 | return false; | |
1734 | ||
1735 | /* Cannot mix APCS26 and APCS32 code. */ | |
1736 | if ((in_flags & EF_APCS_26) != (out_flags & EF_APCS_26)) | |
1737 | return false; | |
1738 | ||
1739 | /* Cannot mix float APCS and non-float APCS code. */ | |
1740 | if ((in_flags & EF_APCS_FLOAT) != (out_flags & EF_APCS_FLOAT)) | |
1741 | return false; | |
1742 | ||
1743 | /* If the src and dest have different interworking flags | |
1744 | then turn off the interworking bit. */ | |
1745 | if ((in_flags & EF_INTERWORK) != (out_flags & EF_INTERWORK)) | |
1746 | { | |
1747 | if (out_flags & EF_INTERWORK) | |
1748 | _bfd_error_handler (_ ("\ | |
1749 | Warning: Clearing the interwork flag in %s because non-interworking code in %s has been linked with it"), | |
1750 | bfd_get_filename (obfd), bfd_get_filename (ibfd)); | |
1751 | ||
1752 | in_flags &= ~EF_INTERWORK; | |
1753 | } | |
1754 | } | |
1755 | ||
1756 | elf_elfheader (obfd)->e_flags = in_flags; | |
1757 | elf_flags_init (obfd) = true; | |
1758 | ||
1759 | return true; | |
1760 | } | |
1761 | ||
1762 | /* Merge backend specific data from an object file to the output | |
1763 | object file when linking. */ | |
1764 | static boolean | |
1765 | elf32_arm_merge_private_bfd_data (ibfd, obfd) | |
1766 | bfd *ibfd; | |
1767 | bfd *obfd; | |
1768 | { | |
1769 | flagword out_flags; | |
1770 | flagword in_flags; | |
1771 | ||
1772 | if ( bfd_get_flavour (ibfd) != bfd_target_elf_flavour | |
1773 | || bfd_get_flavour (obfd) != bfd_target_elf_flavour) | |
1774 | return true; | |
1775 | ||
1776 | /* Check if we have the same endianess */ | |
1777 | if ( ibfd->xvec->byteorder != obfd->xvec->byteorder | |
1778 | && obfd->xvec->byteorder != BFD_ENDIAN_UNKNOWN | |
1779 | && ibfd->xvec->byteorder != BFD_ENDIAN_UNKNOWN) | |
1780 | { | |
1781 | (*_bfd_error_handler) | |
1782 | (_("%s: compiled for a %s endian system and target is %s endian"), | |
1783 | bfd_get_filename (ibfd), | |
1784 | bfd_big_endian (ibfd) ? "big" : "little", | |
1785 | bfd_big_endian (obfd) ? "big" : "little"); | |
1786 | ||
1787 | bfd_set_error (bfd_error_wrong_format); | |
1788 | return false; | |
1789 | } | |
1790 | ||
1791 | /* The input BFD must have had its flags initialised. */ | |
1792 | /* The following seems bogus to me -- The flags are initialized in | |
1793 | the assembler but I don't think an elf_flags_init field is | |
1794 | written into the object */ | |
1795 | /* BFD_ASSERT (elf_flags_init (ibfd)); */ | |
1796 | ||
1797 | in_flags = elf_elfheader (ibfd)->e_flags; | |
1798 | out_flags = elf_elfheader (obfd)->e_flags; | |
1799 | ||
1800 | if (!elf_flags_init (obfd)) | |
1801 | { | |
1802 | /* If the input is the default architecture then do not | |
1803 | bother setting the flags for the output architecture, | |
1804 | instead allow future merges to do this. If no future | |
1805 | merges ever set these flags then they will retain their | |
1806 | unitialised values, which surprise surprise, correspond | |
1807 | to the default values. */ | |
1808 | if (bfd_get_arch_info (ibfd)->the_default) | |
1809 | return true; | |
1810 | ||
1811 | elf_flags_init (obfd) = true; | |
1812 | elf_elfheader (obfd)->e_flags = in_flags; | |
1813 | ||
1814 | if (bfd_get_arch (obfd) == bfd_get_arch (ibfd) | |
1815 | && bfd_get_arch_info (obfd)->the_default) | |
1816 | return bfd_set_arch_mach (obfd, bfd_get_arch (ibfd), bfd_get_mach (ibfd)); | |
1817 | ||
1818 | return true; | |
1819 | } | |
1820 | ||
1821 | /* Check flag compatibility. */ | |
1822 | if (in_flags == out_flags) | |
1823 | return true; | |
1824 | ||
1825 | /* Complain about various flag mismatches. */ | |
1826 | ||
1827 | if ((in_flags & EF_APCS_26) != (out_flags & EF_APCS_26)) | |
1828 | _bfd_error_handler (_ ("\ | |
1829 | Error: %s compiled for APCS-%d, whereas %s is compiled for APCS-%d"), | |
1830 | bfd_get_filename (ibfd), | |
1831 | in_flags & EF_APCS_26 ? 26 : 32, | |
1832 | bfd_get_filename (obfd), | |
1833 | out_flags & EF_APCS_26 ? 26 : 32); | |
1834 | ||
1835 | if ((in_flags & EF_APCS_FLOAT) != (out_flags & EF_APCS_FLOAT)) | |
1836 | _bfd_error_handler (_ ("\ | |
1837 | Error: %s passes floats in %s registers, whereas %s passes them in %s registers"), | |
1838 | bfd_get_filename (ibfd), | |
1839 | in_flags & EF_APCS_FLOAT ? _ ("float") : _ ("integer"), | |
1840 | bfd_get_filename (obfd), | |
1841 | out_flags & EF_APCS_26 ? _ ("float") : _ ("integer")); | |
1842 | ||
1843 | if ((in_flags & EF_PIC) != (out_flags & EF_PIC)) | |
1844 | _bfd_error_handler (_ ("\ | |
1845 | Error: %s is compiled as position %s code, whereas %s is not"), | |
1846 | bfd_get_filename (ibfd), | |
1847 | in_flags & EF_PIC ? _ ("independent") : _ ("dependent"), | |
1848 | bfd_get_filename (obfd)); | |
1849 | ||
1850 | /* Interworking mismatch is only a warning. */ | |
1851 | if ((in_flags & EF_INTERWORK) != (out_flags & EF_INTERWORK)) | |
1852 | { | |
1853 | _bfd_error_handler (_ ("\ | |
1854 | Warning: %s %s interworking, whereas %s %s"), | |
1855 | bfd_get_filename (ibfd), | |
1856 | in_flags & EF_INTERWORK ? _ ("supports") : _ ("does not support"), | |
1857 | bfd_get_filename (obfd), | |
1858 | out_flags & EF_INTERWORK ? _ ("does not") : _ ("does")); | |
1859 | return true; | |
1860 | } | |
1861 | ||
1862 | return false; | |
1863 | } | |
1864 | ||
1865 | /* Display the flags field */ | |
1866 | static boolean | |
1867 | elf32_arm_print_private_bfd_data (abfd, ptr) | |
1868 | bfd *abfd; | |
1869 | PTR ptr; | |
1870 | { | |
1871 | FILE *file = (FILE *) ptr; | |
1872 | ||
1873 | BFD_ASSERT (abfd != NULL && ptr != NULL); | |
1874 | ||
1875 | /* Print normal ELF private data. */ | |
1876 | _bfd_elf_print_private_bfd_data (abfd, ptr); | |
1877 | ||
1878 | /* Ignore init flag - it may not be set, despite the flags field containing valid data. */ | |
1879 | ||
1880 | /* xgettext:c-format */ | |
1881 | fprintf (file, _ ("private flags = %lx:"), elf_elfheader (abfd)->e_flags); | |
1882 | ||
1883 | if (elf_elfheader (abfd)->e_flags & EF_INTERWORK) | |
1884 | fprintf (file, _ (" [interworking enabled]")); | |
1885 | else | |
1886 | fprintf (file, _ (" [interworking not enabled]")); | |
1887 | ||
1888 | if (elf_elfheader (abfd)->e_flags & EF_APCS_26) | |
1889 | fprintf (file, _ (" [APCS-26]")); | |
1890 | else | |
1891 | fprintf (file, _ (" [APCS-32]")); | |
1892 | ||
1893 | if (elf_elfheader (abfd)->e_flags & EF_APCS_FLOAT) | |
1894 | fprintf (file, _ (" [floats passed in float registers]")); | |
1895 | else | |
1896 | fprintf (file, _ (" [floats passed in integer registers]")); | |
1897 | ||
1898 | if (elf_elfheader (abfd)->e_flags & EF_PIC) | |
1899 | fprintf (file, _ (" [position independent]")); | |
1900 | else | |
1901 | fprintf (file, _ (" [absolute position]")); | |
1902 | ||
1903 | fputc ('\n', file); | |
1904 | ||
1905 | return true; | |
1906 | } | |
1907 | ||
1908 | static int | |
1909 | elf32_arm_get_symbol_type (elf_sym, type) | |
1910 | Elf_Internal_Sym * elf_sym; | |
1911 | int type; | |
1912 | { | |
1913 | if (ELF_ST_TYPE (elf_sym->st_info) == STT_ARM_TFUNC) | |
1914 | return ELF_ST_TYPE (elf_sym->st_info); | |
1915 | else | |
1916 | return type; | |
1917 | } | |
1918 | ||
1919 | static asection * | |
1920 | elf32_arm_gc_mark_hook (abfd, info, rel, h, sym) | |
1921 | bfd *abfd; | |
1922 | struct bfd_link_info *info; | |
1923 | Elf_Internal_Rela *rel; | |
1924 | struct elf_link_hash_entry *h; | |
1925 | Elf_Internal_Sym *sym; | |
1926 | { | |
1927 | if (h != NULL) | |
1928 | { | |
1929 | switch (ELF32_R_TYPE (rel->r_info)) | |
1930 | { | |
1931 | case R_ARM_GNU_VTINHERIT: | |
1932 | case R_ARM_GNU_VTENTRY: | |
1933 | break; | |
1934 | ||
1935 | default: | |
1936 | switch (h->root.type) | |
1937 | { | |
1938 | case bfd_link_hash_defined: | |
1939 | case bfd_link_hash_defweak: | |
1940 | return h->root.u.def.section; | |
1941 | ||
1942 | case bfd_link_hash_common: | |
1943 | return h->root.u.c.p->section; | |
1944 | } | |
1945 | } | |
1946 | } | |
1947 | else | |
1948 | { | |
1949 | if (!(elf_bad_symtab (abfd) | |
1950 | && ELF_ST_BIND (sym->st_info) != STB_LOCAL) | |
1951 | && ! ((sym->st_shndx <= 0 || sym->st_shndx >= SHN_LORESERVE) | |
1952 | && sym->st_shndx != SHN_COMMON)) | |
1953 | { | |
1954 | return bfd_section_from_elf_index (abfd, sym->st_shndx); | |
1955 | } | |
1956 | } | |
1957 | return NULL; | |
1958 | } | |
1959 | ||
1960 | static boolean | |
1961 | elf32_arm_gc_sweep_hook (abfd, info, sec, relocs) | |
1962 | bfd *abfd; | |
1963 | struct bfd_link_info *info; | |
1964 | asection *sec; | |
1965 | const Elf_Internal_Rela *relocs; | |
1966 | { | |
1967 | /* we don't use got and plt entries for armelf */ | |
1968 | return true; | |
1969 | } | |
1970 | ||
1971 | /* Look through the relocs for a section during the first phase. | |
1972 | Since we don't do .gots or .plts, we just need to consider the | |
1973 | virtual table relocs for gc. */ | |
1974 | ||
1975 | static boolean | |
1976 | elf32_arm_check_relocs (abfd, info, sec, relocs) | |
1977 | bfd * abfd; | |
1978 | struct bfd_link_info * info; | |
1979 | asection * sec; | |
1980 | const Elf_Internal_Rela * relocs; | |
1981 | { | |
1982 | Elf_Internal_Shdr * symtab_hdr; | |
1983 | struct elf_link_hash_entry ** sym_hashes; | |
1984 | struct elf_link_hash_entry ** sym_hashes_end; | |
1985 | const Elf_Internal_Rela * rel; | |
1986 | const Elf_Internal_Rela * rel_end; | |
1987 | bfd * dynobj; | |
1988 | asection * sgot, *srelgot, *sreloc; | |
1989 | bfd_vma * local_got_offsets; | |
1990 | ||
1991 | if (info->relocateable) | |
1992 | return true; | |
1993 | ||
1994 | sgot = srelgot = sreloc = NULL; | |
1995 | ||
1996 | dynobj = elf_hash_table (info)->dynobj; | |
1997 | local_got_offsets = elf_local_got_offsets (abfd); | |
1998 | ||
1999 | symtab_hdr = &elf_tdata (abfd)->symtab_hdr; | |
2000 | sym_hashes = elf_sym_hashes (abfd); | |
2001 | sym_hashes_end = sym_hashes + symtab_hdr->sh_size/sizeof(Elf32_External_Sym); | |
2002 | if (!elf_bad_symtab (abfd)) | |
2003 | sym_hashes_end -= symtab_hdr->sh_info; | |
2004 | ||
2005 | rel_end = relocs + sec->reloc_count; | |
2006 | for (rel = relocs; rel < rel_end; rel++) | |
2007 | { | |
2008 | struct elf_link_hash_entry *h; | |
2009 | unsigned long r_symndx; | |
2010 | ||
2011 | r_symndx = ELF32_R_SYM (rel->r_info); | |
2012 | if (r_symndx < symtab_hdr->sh_info) | |
2013 | h = NULL; | |
2014 | else | |
2015 | h = sym_hashes[r_symndx - symtab_hdr->sh_info]; | |
2016 | ||
2017 | /* Some relocs require a global offset table. */ | |
2018 | if (dynobj == NULL) | |
2019 | { | |
2020 | switch (ELF32_R_TYPE (rel->r_info)) | |
2021 | { | |
2022 | case R_ARM_GOT32: | |
2023 | case R_ARM_GOTOFF: | |
2024 | case R_ARM_GOTPC: | |
2025 | elf_hash_table (info)->dynobj = dynobj = abfd; | |
2026 | if (! _bfd_elf_create_got_section (dynobj, info)) | |
2027 | return false; | |
2028 | break; | |
2029 | ||
2030 | default: | |
2031 | break; | |
2032 | } | |
2033 | } | |
2034 | ||
2035 | switch (ELF32_R_TYPE (rel->r_info)) | |
2036 | { | |
2037 | case R_ARM_GOT32: | |
2038 | /* This symbol requires a global offset table entry. */ | |
2039 | if (sgot == NULL) | |
2040 | { | |
2041 | sgot = bfd_get_section_by_name (dynobj, ".got"); | |
2042 | BFD_ASSERT (sgot != NULL); | |
2043 | } | |
2044 | ||
2045 | /* Get the got relocation section if necessary. */ | |
2046 | if (srelgot == NULL | |
2047 | && (h != NULL || info->shared)) | |
2048 | { | |
2049 | srelgot = bfd_get_section_by_name (dynobj, ".rel.got"); | |
2050 | ||
2051 | /* If no got relocation section, make one and initialize. */ | |
2052 | if (srelgot == NULL) | |
2053 | { | |
2054 | srelgot = bfd_make_section (dynobj, ".rel.got"); | |
2055 | if (srelgot == NULL | |
2056 | || ! bfd_set_section_flags (dynobj, srelgot, | |
2057 | (SEC_ALLOC | |
2058 | | SEC_LOAD | |
2059 | | SEC_HAS_CONTENTS | |
2060 | | SEC_IN_MEMORY | |
2061 | | SEC_LINKER_CREATED | |
2062 | | SEC_READONLY)) | |
2063 | || ! bfd_set_section_alignment (dynobj, srelgot, 2)) | |
2064 | return false; | |
2065 | } | |
2066 | } | |
2067 | ||
2068 | if (h != NULL) | |
2069 | { | |
2070 | if (h->got.offset != (bfd_vma) -1) | |
2071 | /* We have already allocated space in the .got. */ | |
2072 | break; | |
2073 | ||
2074 | h->got.offset = sgot->_raw_size; | |
2075 | ||
2076 | /* Make sure this symbol is output as a dynamic symbol. */ | |
2077 | if (h->dynindx == -1) | |
2078 | if (! bfd_elf32_link_record_dynamic_symbol (info, h)) | |
2079 | return false; | |
2080 | ||
2081 | srelgot->_raw_size += sizeof (Elf32_External_Rel); | |
2082 | } | |
2083 | else | |
2084 | { | |
2085 | /* This is a global offset table entry for a local | |
2086 | symbol. */ | |
2087 | if (local_got_offsets == NULL) | |
2088 | { | |
2089 | size_t size; | |
2090 | register unsigned int i; | |
2091 | ||
2092 | size = symtab_hdr->sh_info * sizeof (bfd_vma); | |
2093 | local_got_offsets = (bfd_vma *) bfd_alloc (abfd, size); | |
2094 | if (local_got_offsets == NULL) | |
2095 | return false; | |
2096 | elf_local_got_offsets (abfd) = local_got_offsets; | |
2097 | for (i = 0; i < symtab_hdr->sh_info; i++) | |
2098 | local_got_offsets[i] = (bfd_vma) -1; | |
2099 | } | |
2100 | ||
2101 | if (local_got_offsets[r_symndx] != (bfd_vma) -1) | |
2102 | /* We have already allocated space in the .got. */ | |
2103 | break; | |
2104 | ||
2105 | local_got_offsets[r_symndx] = sgot->_raw_size; | |
2106 | ||
2107 | if (info->shared) | |
2108 | /* If we are generating a shared object, we need to | |
2109 | output a R_ARM_RELATIVE reloc so that the dynamic | |
2110 | linker can adjust this GOT entry. */ | |
2111 | srelgot->_raw_size += sizeof (Elf32_External_Rel); | |
2112 | } | |
2113 | ||
2114 | sgot->_raw_size += 4; | |
2115 | break; | |
2116 | ||
2117 | case R_ARM_PLT32: | |
2118 | /* This symbol requires a procedure linkage table entry. We | |
2119 | actually build the entry in adjust_dynamic_symbol, | |
2120 | because this might be a case of linking PIC code which is | |
2121 | never referenced by a dynamic object, in which case we | |
2122 | don't need to generate a procedure linkage table entry | |
2123 | after all. */ | |
2124 | ||
2125 | /* If this is a local symbol, we resolve it directly without | |
2126 | creating a procedure linkage table entry. */ | |
2127 | if (h == NULL) | |
2128 | continue; | |
2129 | ||
2130 | h->elf_link_hash_flags |= ELF_LINK_HASH_NEEDS_PLT; | |
2131 | break; | |
2132 | ||
2133 | case R_ARM_ABS32: | |
2134 | case R_ARM_REL32: | |
2135 | case R_ARM_PC24: | |
2136 | /* If we are creating a shared library, and this is a reloc | |
2137 | against a global symbol, or a non PC relative reloc | |
2138 | against a local symbol, then we need to copy the reloc | |
2139 | into the shared library. However, if we are linking with | |
2140 | -Bsymbolic, we do not need to copy a reloc against a | |
2141 | global symbol which is defined in an object we are | |
2142 | including in the link (i.e., DEF_REGULAR is set). At | |
2143 | this point we have not seen all the input files, so it is | |
2144 | possible that DEF_REGULAR is not set now but will be set | |
2145 | later (it is never cleared). We account for that | |
2146 | possibility below by storing information in the | |
2147 | pcrel_relocs_copied field of the hash table entry. */ | |
2148 | if (info->shared | |
2149 | && (ELF32_R_TYPE (rel->r_info) != R_ARM_PC24 | |
2150 | || (h != NULL | |
2151 | && (! info->symbolic | |
2152 | || (h->elf_link_hash_flags | |
2153 | & ELF_LINK_HASH_DEF_REGULAR) == 0)))) | |
2154 | { | |
2155 | /* When creating a shared object, we must copy these | |
2156 | reloc types into the output file. We create a reloc | |
2157 | section in dynobj and make room for this reloc. */ | |
2158 | if (sreloc == NULL) | |
2159 | { | |
2160 | const char * name; | |
2161 | ||
2162 | name = (bfd_elf_string_from_elf_section | |
2163 | (abfd, | |
2164 | elf_elfheader (abfd)->e_shstrndx, | |
2165 | elf_section_data (sec)->rel_hdr.sh_name)); | |
2166 | if (name == NULL) | |
2167 | return false; | |
2168 | ||
2169 | BFD_ASSERT (strncmp (name, ".rel", 4) == 0 | |
2170 | && strcmp (bfd_get_section_name (abfd, sec), | |
2171 | name + 4) == 0); | |
2172 | ||
2173 | sreloc = bfd_get_section_by_name (dynobj, name); | |
2174 | if (sreloc == NULL) | |
2175 | { | |
2176 | flagword flags; | |
2177 | ||
2178 | sreloc = bfd_make_section (dynobj, name); | |
2179 | flags = (SEC_HAS_CONTENTS | SEC_READONLY | |
2180 | | SEC_IN_MEMORY | SEC_LINKER_CREATED); | |
2181 | if ((sec->flags & SEC_ALLOC) != 0) | |
2182 | flags |= SEC_ALLOC | SEC_LOAD; | |
2183 | if (sreloc == NULL | |
2184 | || ! bfd_set_section_flags (dynobj, sreloc, flags) | |
2185 | || ! bfd_set_section_alignment (dynobj, sreloc, 2)) | |
2186 | return false; | |
2187 | } | |
2188 | } | |
2189 | ||
2190 | sreloc->_raw_size += sizeof (Elf32_External_Rel); | |
2191 | /* If we are linking with -Bsymbolic, and this is a | |
2192 | global symbol, we count the number of PC relative | |
2193 | relocations we have entered for this symbol, so that | |
2194 | we can discard them again if the symbol is later | |
2195 | defined by a regular object. Note that this function | |
2196 | is only called if we are using an elf_i386 linker | |
2197 | hash table, which means that h is really a pointer to | |
2198 | an elf_i386_link_hash_entry. */ | |
2199 | if (h != NULL && info->symbolic | |
2200 | && ELF32_R_TYPE (rel->r_info) == R_ARM_PC24) | |
2201 | { | |
2202 | struct elf32_arm_link_hash_entry * eh; | |
2203 | struct elf32_arm_pcrel_relocs_copied * p; | |
2204 | ||
2205 | eh = (struct elf32_arm_link_hash_entry *) h; | |
2206 | ||
2207 | for (p = eh->pcrel_relocs_copied; p != NULL; p = p->next) | |
2208 | if (p->section == sreloc) | |
2209 | break; | |
2210 | ||
2211 | if (p == NULL) | |
2212 | { | |
2213 | p = ((struct elf32_arm_pcrel_relocs_copied *) | |
2214 | bfd_alloc (dynobj, sizeof * p)); | |
2215 | ||
2216 | if (p == NULL) | |
2217 | return false; | |
2218 | p->next = eh->pcrel_relocs_copied; | |
2219 | eh->pcrel_relocs_copied = p; | |
2220 | p->section = sreloc; | |
2221 | p->count = 0; | |
2222 | } | |
2223 | ||
2224 | ++p->count; | |
2225 | } | |
2226 | } | |
2227 | break; | |
2228 | ||
2229 | /* This relocation describes the C++ object vtable hierarchy. | |
2230 | Reconstruct it for later use during GC. */ | |
2231 | case R_ARM_GNU_VTINHERIT: | |
2232 | if (!_bfd_elf32_gc_record_vtinherit (abfd, sec, h, rel->r_offset)) | |
2233 | return false; | |
2234 | break; | |
2235 | ||
2236 | /* This relocation describes which C++ vtable entries are actually | |
2237 | used. Record for later use during GC. */ | |
2238 | case R_ARM_GNU_VTENTRY: | |
2239 | if (!_bfd_elf32_gc_record_vtentry (abfd, sec, h, rel->r_addend)) | |
2240 | return false; | |
2241 | break; | |
2242 | } | |
2243 | } | |
2244 | ||
2245 | return true; | |
2246 | } | |
2247 | ||
2248 | ||
2249 | /* Find the nearest line to a particular section and offset, for error | |
2250 | reporting. This code is a duplicate of the code in elf.c, except | |
2251 | that it also accepts STT_ARM_TFUNC as a symbol that names a function. */ | |
2252 | ||
2253 | static boolean | |
2254 | elf32_arm_find_nearest_line | |
2255 | (abfd, section, symbols, offset, filename_ptr, functionname_ptr, line_ptr) | |
2256 | bfd * abfd; | |
2257 | asection * section; | |
2258 | asymbol ** symbols; | |
2259 | bfd_vma offset; | |
2260 | CONST char ** filename_ptr; | |
2261 | CONST char ** functionname_ptr; | |
2262 | unsigned int * line_ptr; | |
2263 | { | |
2264 | boolean found; | |
2265 | const char * filename; | |
2266 | asymbol * func; | |
2267 | bfd_vma low_func; | |
2268 | asymbol ** p; | |
2269 | ||
2270 | if (_bfd_dwarf2_find_nearest_line (abfd, section, symbols, offset, | |
2271 | filename_ptr, functionname_ptr, | |
2272 | line_ptr)) | |
2273 | return true; | |
2274 | ||
2275 | if (! _bfd_stab_section_find_nearest_line (abfd, symbols, section, offset, | |
2276 | &found, filename_ptr, | |
2277 | functionname_ptr, line_ptr, | |
2278 | &elf_tdata (abfd)->line_info)) | |
2279 | return false; | |
2280 | ||
2281 | if (found) | |
2282 | return true; | |
2283 | ||
2284 | if (symbols == NULL) | |
2285 | return false; | |
2286 | ||
2287 | filename = NULL; | |
2288 | func = NULL; | |
2289 | low_func = 0; | |
2290 | ||
2291 | for (p = symbols; *p != NULL; p++) | |
2292 | { | |
2293 | elf_symbol_type *q; | |
2294 | ||
2295 | q = (elf_symbol_type *) *p; | |
2296 | ||
2297 | if (bfd_get_section (&q->symbol) != section) | |
2298 | continue; | |
2299 | ||
2300 | switch (ELF_ST_TYPE (q->internal_elf_sym.st_info)) | |
2301 | { | |
2302 | default: | |
2303 | break; | |
2304 | case STT_FILE: | |
2305 | filename = bfd_asymbol_name (&q->symbol); | |
2306 | break; | |
2307 | case STT_NOTYPE: | |
2308 | case STT_FUNC: | |
2309 | case STT_ARM_TFUNC: | |
2310 | if (q->symbol.section == section | |
2311 | && q->symbol.value >= low_func | |
2312 | && q->symbol.value <= offset) | |
2313 | { | |
2314 | func = (asymbol *) q; | |
2315 | low_func = q->symbol.value; | |
2316 | } | |
2317 | break; | |
2318 | } | |
2319 | } | |
2320 | ||
2321 | if (func == NULL) | |
2322 | return false; | |
2323 | ||
2324 | *filename_ptr = filename; | |
2325 | *functionname_ptr = bfd_asymbol_name (func); | |
2326 | *line_ptr = 0; | |
2327 | ||
2328 | return true; | |
2329 | } | |
2330 | ||
2331 | /* Adjust a symbol defined by a dynamic object and referenced by a | |
2332 | regular object. The current definition is in some section of the | |
2333 | dynamic object, but we're not including those sections. We have to | |
2334 | change the definition to something the rest of the link can | |
2335 | understand. */ | |
2336 | ||
2337 | static boolean | |
2338 | elf32_arm_adjust_dynamic_symbol (info, h) | |
2339 | struct bfd_link_info * info; | |
2340 | struct elf_link_hash_entry * h; | |
2341 | { | |
2342 | bfd * dynobj; | |
2343 | asection * s; | |
2344 | unsigned int power_of_two; | |
2345 | ||
2346 | dynobj = elf_hash_table (info)->dynobj; | |
2347 | ||
2348 | /* Make sure we know what is going on here. */ | |
2349 | BFD_ASSERT (dynobj != NULL | |
2350 | && ((h->elf_link_hash_flags & ELF_LINK_HASH_NEEDS_PLT) | |
2351 | || h->weakdef != NULL | |
2352 | || ((h->elf_link_hash_flags | |
2353 | & ELF_LINK_HASH_DEF_DYNAMIC) != 0 | |
2354 | && (h->elf_link_hash_flags | |
2355 | & ELF_LINK_HASH_REF_REGULAR) != 0 | |
2356 | && (h->elf_link_hash_flags | |
2357 | & ELF_LINK_HASH_DEF_REGULAR) == 0))); | |
2358 | ||
2359 | /* If this is a function, put it in the procedure linkage table. We | |
2360 | will fill in the contents of the procedure linkage table later, | |
2361 | when we know the address of the .got section. */ | |
2362 | if (h->type == STT_FUNC | |
2363 | || (h->elf_link_hash_flags & ELF_LINK_HASH_NEEDS_PLT) != 0) | |
2364 | { | |
2365 | if (! info->shared | |
2366 | && (h->elf_link_hash_flags & ELF_LINK_HASH_DEF_DYNAMIC) == 0 | |
2367 | && (h->elf_link_hash_flags & ELF_LINK_HASH_REF_DYNAMIC) == 0) | |
2368 | { | |
2369 | /* This case can occur if we saw a PLT32 reloc in an input | |
2370 | file, but the symbol was never referred to by a dynamic | |
2371 | object. In such a case, we don't actually need to build | |
2372 | a procedure linkage table, and we can just do a PC32 | |
2373 | reloc instead. */ | |
2374 | BFD_ASSERT ((h->elf_link_hash_flags & ELF_LINK_HASH_NEEDS_PLT) != 0); | |
2375 | return true; | |
2376 | } | |
2377 | ||
2378 | /* Make sure this symbol is output as a dynamic symbol. */ | |
2379 | if (h->dynindx == -1) | |
2380 | { | |
2381 | if (! bfd_elf32_link_record_dynamic_symbol (info, h)) | |
2382 | return false; | |
2383 | } | |
2384 | ||
2385 | s = bfd_get_section_by_name (dynobj, ".plt"); | |
2386 | BFD_ASSERT (s != NULL); | |
2387 | ||
2388 | /* If this is the first .plt entry, make room for the special | |
2389 | first entry. */ | |
2390 | if (s->_raw_size == 0) | |
2391 | s->_raw_size += PLT_ENTRY_SIZE; | |
2392 | ||
2393 | /* If this symbol is not defined in a regular file, and we are | |
2394 | not generating a shared library, then set the symbol to this | |
2395 | location in the .plt. This is required to make function | |
2396 | pointers compare as equal between the normal executable and | |
2397 | the shared library. */ | |
2398 | if (! info->shared | |
2399 | && (h->elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR) == 0) | |
2400 | { | |
2401 | h->root.u.def.section = s; | |
2402 | h->root.u.def.value = s->_raw_size; | |
2403 | } | |
2404 | ||
2405 | h->plt.offset = s->_raw_size; | |
2406 | ||
2407 | /* Make room for this entry. */ | |
2408 | s->_raw_size += PLT_ENTRY_SIZE; | |
2409 | ||
2410 | /* We also need to make an entry in the .got.plt section, which | |
2411 | will be placed in the .got section by the linker script. */ | |
2412 | ||
2413 | s = bfd_get_section_by_name (dynobj, ".got.plt"); | |
2414 | BFD_ASSERT (s != NULL); | |
2415 | s->_raw_size += 4; | |
2416 | ||
2417 | /* We also need to make an entry in the .rel.plt section. */ | |
2418 | ||
2419 | s = bfd_get_section_by_name (dynobj, ".rel.plt"); | |
2420 | BFD_ASSERT (s != NULL); | |
2421 | s->_raw_size += sizeof (Elf32_External_Rel); | |
2422 | ||
2423 | return true; | |
2424 | } | |
2425 | ||
2426 | /* If this is a weak symbol, and there is a real definition, the | |
2427 | processor independent code will have arranged for us to see the | |
2428 | real definition first, and we can just use the same value. */ | |
2429 | if (h->weakdef != NULL) | |
2430 | { | |
2431 | BFD_ASSERT (h->weakdef->root.type == bfd_link_hash_defined | |
2432 | || h->weakdef->root.type == bfd_link_hash_defweak); | |
2433 | h->root.u.def.section = h->weakdef->root.u.def.section; | |
2434 | h->root.u.def.value = h->weakdef->root.u.def.value; | |
2435 | return true; | |
2436 | } | |
2437 | ||
2438 | /* This is a reference to a symbol defined by a dynamic object which | |
2439 | is not a function. */ | |
2440 | ||
2441 | /* If we are creating a shared library, we must presume that the | |
2442 | only references to the symbol are via the global offset table. | |
2443 | For such cases we need not do anything here; the relocations will | |
2444 | be handled correctly by relocate_section. */ | |
2445 | if (info->shared) | |
2446 | return true; | |
2447 | ||
2448 | /* We must allocate the symbol in our .dynbss section, which will | |
2449 | become part of the .bss section of the executable. There will be | |
2450 | an entry for this symbol in the .dynsym section. The dynamic | |
2451 | object will contain position independent code, so all references | |
2452 | from the dynamic object to this symbol will go through the global | |
2453 | offset table. The dynamic linker will use the .dynsym entry to | |
2454 | determine the address it must put in the global offset table, so | |
2455 | both the dynamic object and the regular object will refer to the | |
2456 | same memory location for the variable. */ | |
2457 | ||
2458 | s = bfd_get_section_by_name (dynobj, ".dynbss"); | |
2459 | BFD_ASSERT (s != NULL); | |
2460 | ||
2461 | /* We must generate a R_ARM_COPY reloc to tell the dynamic linker to | |
2462 | copy the initial value out of the dynamic object and into the | |
2463 | runtime process image. We need to remember the offset into the | |
2464 | .rel.bss section we are going to use. */ | |
2465 | if ((h->root.u.def.section->flags & SEC_ALLOC) != 0) | |
2466 | { | |
2467 | asection *srel; | |
2468 | ||
2469 | srel = bfd_get_section_by_name (dynobj, ".rel.bss"); | |
2470 | BFD_ASSERT (srel != NULL); | |
2471 | srel->_raw_size += sizeof (Elf32_External_Rel); | |
2472 | h->elf_link_hash_flags |= ELF_LINK_HASH_NEEDS_COPY; | |
2473 | } | |
2474 | ||
2475 | /* We need to figure out the alignment required for this symbol. I | |
2476 | have no idea how ELF linkers handle this. */ | |
2477 | power_of_two = bfd_log2 (h->size); | |
2478 | if (power_of_two > 3) | |
2479 | power_of_two = 3; | |
2480 | ||
2481 | /* Apply the required alignment. */ | |
2482 | s->_raw_size = BFD_ALIGN (s->_raw_size, | |
2483 | (bfd_size_type) (1 << power_of_two)); | |
2484 | if (power_of_two > bfd_get_section_alignment (dynobj, s)) | |
2485 | { | |
2486 | if (! bfd_set_section_alignment (dynobj, s, power_of_two)) | |
2487 | return false; | |
2488 | } | |
2489 | ||
2490 | /* Define the symbol as being at this point in the section. */ | |
2491 | h->root.u.def.section = s; | |
2492 | h->root.u.def.value = s->_raw_size; | |
2493 | ||
2494 | /* Increment the section size to make room for the symbol. */ | |
2495 | s->_raw_size += h->size; | |
2496 | ||
2497 | return true; | |
2498 | } | |
2499 | ||
2500 | /* Set the sizes of the dynamic sections. */ | |
2501 | ||
2502 | static boolean | |
2503 | elf32_arm_size_dynamic_sections (output_bfd, info) | |
2504 | bfd * output_bfd; | |
2505 | struct bfd_link_info * info; | |
2506 | { | |
2507 | bfd * dynobj; | |
2508 | asection * s; | |
2509 | boolean plt; | |
2510 | boolean relocs; | |
2511 | boolean reltext; | |
2512 | ||
2513 | dynobj = elf_hash_table (info)->dynobj; | |
2514 | BFD_ASSERT (dynobj != NULL); | |
2515 | ||
2516 | if (elf_hash_table (info)->dynamic_sections_created) | |
2517 | { | |
2518 | /* Set the contents of the .interp section to the interpreter. */ | |
2519 | if (! info->shared) | |
2520 | { | |
2521 | s = bfd_get_section_by_name (dynobj, ".interp"); | |
2522 | BFD_ASSERT (s != NULL); | |
2523 | s->_raw_size = sizeof ELF_DYNAMIC_INTERPRETER; | |
2524 | s->contents = (unsigned char *) ELF_DYNAMIC_INTERPRETER; | |
2525 | } | |
2526 | } | |
2527 | else | |
2528 | { | |
2529 | /* We may have created entries in the .rel.got section. | |
2530 | However, if we are not creating the dynamic sections, we will | |
2531 | not actually use these entries. Reset the size of .rel.got, | |
2532 | which will cause it to get stripped from the output file | |
2533 | below. */ | |
2534 | s = bfd_get_section_by_name (dynobj, ".rel.got"); | |
2535 | if (s != NULL) | |
2536 | s->_raw_size = 0; | |
2537 | } | |
2538 | ||
2539 | /* If this is a -Bsymbolic shared link, then we need to discard all | |
2540 | PC relative relocs against symbols defined in a regular object. | |
2541 | We allocated space for them in the check_relocs routine, but we | |
2542 | will not fill them in in the relocate_section routine. */ | |
2543 | if (info->shared && info->symbolic) | |
2544 | elf32_arm_link_hash_traverse (elf32_arm_hash_table (info), | |
2545 | elf32_arm_discard_copies, | |
2546 | (PTR) NULL); | |
2547 | ||
2548 | /* The check_relocs and adjust_dynamic_symbol entry points have | |
2549 | determined the sizes of the various dynamic sections. Allocate | |
2550 | memory for them. */ | |
2551 | plt = false; | |
2552 | relocs = false; | |
2553 | reltext = false; | |
2554 | for (s = dynobj->sections; s != NULL; s = s->next) | |
2555 | { | |
2556 | const char * name; | |
2557 | boolean strip; | |
2558 | ||
2559 | if ((s->flags & SEC_LINKER_CREATED) == 0) | |
2560 | continue; | |
2561 | ||
2562 | /* It's OK to base decisions on the section name, because none | |
2563 | of the dynobj section names depend upon the input files. */ | |
2564 | name = bfd_get_section_name (dynobj, s); | |
2565 | ||
2566 | strip = false; | |
2567 | ||
2568 | if (strcmp (name, ".plt") == 0) | |
2569 | { | |
2570 | if (s->_raw_size == 0) | |
2571 | { | |
2572 | /* Strip this section if we don't need it; see the | |
2573 | comment below. */ | |
2574 | strip = true; | |
2575 | } | |
2576 | else | |
2577 | { | |
2578 | /* Remember whether there is a PLT. */ | |
2579 | plt = true; | |
2580 | } | |
2581 | } | |
2582 | else if (strncmp (name, ".rel", 4) == 0) | |
2583 | { | |
2584 | if (s->_raw_size == 0) | |
2585 | { | |
2586 | /* If we don't need this section, strip it from the | |
2587 | output file. This is mostly to handle .rel.bss and | |
2588 | .rel.plt. We must create both sections in | |
2589 | create_dynamic_sections, because they must be created | |
2590 | before the linker maps input sections to output | |
2591 | sections. The linker does that before | |
2592 | adjust_dynamic_symbol is called, and it is that | |
2593 | function which decides whether anything needs to go | |
2594 | into these sections. */ | |
2595 | strip = true; | |
2596 | } | |
2597 | else | |
2598 | { | |
2599 | asection * target; | |
2600 | ||
2601 | /* Remember whether there are any reloc sections other | |
2602 | than .rel.plt. */ | |
2603 | if (strcmp (name, ".rel.plt") != 0) | |
2604 | { | |
2605 | const char *outname; | |
2606 | ||
2607 | relocs = true; | |
2608 | ||
2609 | /* If this relocation section applies to a read only | |
2610 | section, then we probably need a DT_TEXTREL | |
2611 | entry. The entries in the .rel.plt section | |
2612 | really apply to the .got section, which we | |
2613 | created ourselves and so know is not readonly. */ | |
2614 | outname = bfd_get_section_name (output_bfd, | |
2615 | s->output_section); | |
2616 | target = bfd_get_section_by_name (output_bfd, outname + 4); | |
2617 | if (target != NULL | |
2618 | && (target->flags & SEC_READONLY) != 0 | |
2619 | && (target->flags & SEC_ALLOC) != 0) | |
2620 | reltext = true; | |
2621 | } | |
2622 | ||
2623 | /* We use the reloc_count field as a counter if we need | |
2624 | to copy relocs into the output file. */ | |
2625 | s->reloc_count = 0; | |
2626 | } | |
2627 | } | |
2628 | else if (strncmp (name, ".got", 4) != 0) | |
2629 | { | |
2630 | /* It's not one of our sections, so don't allocate space. */ | |
2631 | continue; | |
2632 | } | |
2633 | ||
2634 | if (strip) | |
2635 | { | |
2636 | asection ** spp; | |
2637 | ||
2638 | for (spp = &s->output_section->owner->sections; | |
2639 | *spp != s->output_section; | |
2640 | spp = &(*spp)->next) | |
2641 | ; | |
2642 | *spp = s->output_section->next; | |
2643 | --s->output_section->owner->section_count; | |
2644 | ||
2645 | continue; | |
2646 | } | |
2647 | ||
2648 | /* Allocate memory for the section contents. */ | |
2649 | s->contents = (bfd_byte *) bfd_zalloc (dynobj, s->_raw_size); | |
2650 | if (s->contents == NULL && s->_raw_size != 0) | |
2651 | return false; | |
2652 | } | |
2653 | ||
2654 | if (elf_hash_table (info)->dynamic_sections_created) | |
2655 | { | |
2656 | /* Add some entries to the .dynamic section. We fill in the | |
2657 | values later, in elf32_arm_finish_dynamic_sections, but we | |
2658 | must add the entries now so that we get the correct size for | |
2659 | the .dynamic section. The DT_DEBUG entry is filled in by the | |
2660 | dynamic linker and used by the debugger. */ | |
2661 | if (! info->shared) | |
2662 | { | |
2663 | if (! bfd_elf32_add_dynamic_entry (info, DT_DEBUG, 0)) | |
2664 | return false; | |
2665 | } | |
2666 | ||
2667 | if (plt) | |
2668 | { | |
2669 | if (! bfd_elf32_add_dynamic_entry (info, DT_PLTGOT, 0) | |
2670 | || ! bfd_elf32_add_dynamic_entry (info, DT_PLTRELSZ, 0) | |
2671 | || ! bfd_elf32_add_dynamic_entry (info, DT_PLTREL, DT_REL) | |
2672 | || ! bfd_elf32_add_dynamic_entry (info, DT_JMPREL, 0)) | |
2673 | return false; | |
2674 | } | |
2675 | ||
2676 | if (relocs) | |
2677 | { | |
2678 | if (! bfd_elf32_add_dynamic_entry (info, DT_REL, 0) | |
2679 | || ! bfd_elf32_add_dynamic_entry (info, DT_RELSZ, 0) | |
2680 | || ! bfd_elf32_add_dynamic_entry (info, DT_RELENT, | |
2681 | sizeof (Elf32_External_Rel))) | |
2682 | return false; | |
2683 | } | |
2684 | ||
2685 | if (reltext) | |
2686 | { | |
2687 | if (! bfd_elf32_add_dynamic_entry (info, DT_TEXTREL, 0)) | |
2688 | return false; | |
2689 | } | |
2690 | } | |
2691 | ||
2692 | return true; | |
2693 | } | |
2694 | ||
2695 | /* This function is called via elf32_arm_link_hash_traverse if we are | |
2696 | creating a shared object with -Bsymbolic. It discards the space | |
2697 | allocated to copy PC relative relocs against symbols which are | |
2698 | defined in regular objects. We allocated space for them in the | |
2699 | check_relocs routine, but we won't fill them in in the | |
2700 | relocate_section routine. */ | |
2701 | ||
2702 | static boolean | |
2703 | elf32_arm_discard_copies (h, ignore) | |
2704 | struct elf32_arm_link_hash_entry * h; | |
2705 | PTR ignore; | |
2706 | { | |
2707 | struct elf32_arm_pcrel_relocs_copied * s; | |
2708 | ||
2709 | /* We only discard relocs for symbols defined in a regular object. */ | |
2710 | if ((h->root.elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR) == 0) | |
2711 | return true; | |
2712 | ||
2713 | for (s = h->pcrel_relocs_copied; s != NULL; s = s->next) | |
2714 | s->section->_raw_size -= s->count * sizeof (Elf32_External_Rel); | |
2715 | ||
2716 | return true; | |
2717 | } | |
2718 | ||
2719 | /* Finish up dynamic symbol handling. We set the contents of various | |
2720 | dynamic sections here. */ | |
2721 | ||
2722 | static boolean | |
2723 | elf32_arm_finish_dynamic_symbol (output_bfd, info, h, sym) | |
2724 | bfd * output_bfd; | |
2725 | struct bfd_link_info * info; | |
2726 | struct elf_link_hash_entry * h; | |
2727 | Elf_Internal_Sym * sym; | |
2728 | { | |
2729 | bfd * dynobj; | |
2730 | ||
2731 | dynobj = elf_hash_table (info)->dynobj; | |
2732 | ||
2733 | if (h->plt.offset != (bfd_vma) -1) | |
2734 | { | |
2735 | asection * splt; | |
2736 | asection * sgot; | |
2737 | asection * srel; | |
2738 | bfd_vma plt_index; | |
2739 | bfd_vma got_offset; | |
2740 | Elf_Internal_Rel rel; | |
2741 | ||
2742 | /* This symbol has an entry in the procedure linkage table. Set | |
2743 | it up. */ | |
2744 | ||
2745 | BFD_ASSERT (h->dynindx != -1); | |
2746 | ||
2747 | splt = bfd_get_section_by_name (dynobj, ".plt"); | |
2748 | sgot = bfd_get_section_by_name (dynobj, ".got.plt"); | |
2749 | srel = bfd_get_section_by_name (dynobj, ".rel.plt"); | |
2750 | BFD_ASSERT (splt != NULL && sgot != NULL && srel != NULL); | |
2751 | ||
2752 | /* Get the index in the procedure linkage table which | |
2753 | corresponds to this symbol. This is the index of this symbol | |
2754 | in all the symbols for which we are making plt entries. The | |
2755 | first entry in the procedure linkage table is reserved. */ | |
2756 | plt_index = h->plt.offset / PLT_ENTRY_SIZE - 1; | |
2757 | ||
2758 | /* Get the offset into the .got table of the entry that | |
2759 | corresponds to this function. Each .got entry is 4 bytes. | |
2760 | The first three are reserved. */ | |
2761 | got_offset = (plt_index + 3) * 4; | |
2762 | ||
2763 | /* Fill in the entry in the procedure linkage table. */ | |
2764 | memcpy (splt->contents + h->plt.offset, | |
2765 | elf32_arm_plt_entry, | |
2766 | PLT_ENTRY_SIZE); | |
2767 | bfd_put_32 (output_bfd, | |
2768 | (sgot->output_section->vma | |
2769 | + sgot->output_offset | |
2770 | + got_offset | |
2771 | - splt->output_section->vma | |
2772 | - splt->output_offset | |
2773 | - h->plt.offset - 12), | |
2774 | splt->contents + h->plt.offset + 12); | |
2775 | ||
2776 | /* Fill in the entry in the global offset table. */ | |
2777 | bfd_put_32 (output_bfd, | |
2778 | (splt->output_section->vma | |
2779 | + splt->output_offset), | |
2780 | sgot->contents + got_offset); | |
2781 | ||
2782 | /* Fill in the entry in the .rel.plt section. */ | |
2783 | rel.r_offset = (sgot->output_section->vma | |
2784 | + sgot->output_offset | |
2785 | + got_offset); | |
2786 | rel.r_info = ELF32_R_INFO (h->dynindx, R_ARM_JUMP_SLOT); | |
2787 | bfd_elf32_swap_reloc_out (output_bfd, &rel, | |
2788 | ((Elf32_External_Rel *) srel->contents | |
2789 | + plt_index)); | |
2790 | ||
2791 | if ((h->elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR) == 0) | |
2792 | { | |
2793 | /* Mark the symbol as undefined, rather than as defined in | |
2794 | the .plt section. Leave the value alone. */ | |
2795 | sym->st_shndx = SHN_UNDEF; | |
2796 | } | |
2797 | } | |
2798 | ||
2799 | if (h->got.offset != (bfd_vma) -1) | |
2800 | { | |
2801 | asection * sgot; | |
2802 | asection * srel; | |
2803 | Elf_Internal_Rel rel; | |
2804 | ||
2805 | /* This symbol has an entry in the global offset table. Set it | |
2806 | up. */ | |
2807 | ||
2808 | sgot = bfd_get_section_by_name (dynobj, ".got"); | |
2809 | srel = bfd_get_section_by_name (dynobj, ".rel.got"); | |
2810 | BFD_ASSERT (sgot != NULL && srel != NULL); | |
2811 | ||
2812 | rel.r_offset = (sgot->output_section->vma | |
2813 | + sgot->output_offset | |
2814 | + (h->got.offset &~ 1)); | |
2815 | ||
2816 | /* If this is a -Bsymbolic link, and the symbol is defined | |
2817 | locally, we just want to emit a RELATIVE reloc. The entry in | |
2818 | the global offset table will already have been initialized in | |
2819 | the relocate_section function. */ | |
2820 | if (info->shared | |
2821 | && (info->symbolic || h->dynindx == -1) | |
2822 | && (h->elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR)) | |
2823 | rel.r_info = ELF32_R_INFO (0, R_ARM_RELATIVE); | |
2824 | else | |
2825 | { | |
2826 | bfd_put_32 (output_bfd, (bfd_vma) 0, sgot->contents + h->got.offset); | |
2827 | rel.r_info = ELF32_R_INFO (h->dynindx, R_ARM_GLOB_DAT); | |
2828 | } | |
2829 | ||
2830 | bfd_elf32_swap_reloc_out (output_bfd, &rel, | |
2831 | ((Elf32_External_Rel *) srel->contents | |
2832 | + srel->reloc_count)); | |
2833 | ++srel->reloc_count; | |
2834 | } | |
2835 | ||
2836 | if ((h->elf_link_hash_flags & ELF_LINK_HASH_NEEDS_COPY) != 0) | |
2837 | { | |
2838 | asection * s; | |
2839 | Elf_Internal_Rel rel; | |
2840 | ||
2841 | /* This symbol needs a copy reloc. Set it up. */ | |
2842 | ||
2843 | BFD_ASSERT (h->dynindx != -1 | |
2844 | && (h->root.type == bfd_link_hash_defined | |
2845 | || h->root.type == bfd_link_hash_defweak)); | |
2846 | ||
2847 | s = bfd_get_section_by_name (h->root.u.def.section->owner, | |
2848 | ".rel.bss"); | |
2849 | BFD_ASSERT (s != NULL); | |
2850 | ||
2851 | rel.r_offset = (h->root.u.def.value | |
2852 | + h->root.u.def.section->output_section->vma | |
2853 | + h->root.u.def.section->output_offset); | |
2854 | rel.r_info = ELF32_R_INFO (h->dynindx, R_ARM_COPY); | |
2855 | bfd_elf32_swap_reloc_out (output_bfd, &rel, | |
2856 | ((Elf32_External_Rel *) s->contents | |
2857 | + s->reloc_count)); | |
2858 | ++s->reloc_count; | |
2859 | } | |
2860 | ||
2861 | /* Mark _DYNAMIC and _GLOBAL_OFFSET_TABLE_ as absolute. */ | |
2862 | if (strcmp (h->root.root.string, "_DYNAMIC") == 0 | |
2863 | || strcmp (h->root.root.string, "_GLOBAL_OFFSET_TABLE_") == 0) | |
2864 | sym->st_shndx = SHN_ABS; | |
2865 | ||
2866 | return true; | |
2867 | } | |
2868 | ||
2869 | /* Finish up the dynamic sections. */ | |
2870 | ||
2871 | static boolean | |
2872 | elf32_arm_finish_dynamic_sections (output_bfd, info) | |
2873 | bfd * output_bfd; | |
2874 | struct bfd_link_info * info; | |
2875 | { | |
2876 | bfd * dynobj; | |
2877 | asection * sgot; | |
2878 | asection * sdyn; | |
2879 | ||
2880 | dynobj = elf_hash_table (info)->dynobj; | |
2881 | ||
2882 | sgot = bfd_get_section_by_name (dynobj, ".got.plt"); | |
2883 | BFD_ASSERT (sgot != NULL); | |
2884 | sdyn = bfd_get_section_by_name (dynobj, ".dynamic"); | |
2885 | ||
2886 | if (elf_hash_table (info)->dynamic_sections_created) | |
2887 | { | |
2888 | asection *splt; | |
2889 | Elf32_External_Dyn *dyncon, *dynconend; | |
2890 | ||
2891 | splt = bfd_get_section_by_name (dynobj, ".plt"); | |
2892 | BFD_ASSERT (splt != NULL && sdyn != NULL); | |
2893 | ||
2894 | dyncon = (Elf32_External_Dyn *) sdyn->contents; | |
2895 | dynconend = (Elf32_External_Dyn *) (sdyn->contents + sdyn->_raw_size); | |
2896 | for (; dyncon < dynconend; dyncon++) | |
2897 | { | |
2898 | Elf_Internal_Dyn dyn; | |
2899 | const char * name; | |
2900 | asection * s; | |
2901 | ||
2902 | bfd_elf32_swap_dyn_in (dynobj, dyncon, &dyn); | |
2903 | ||
2904 | switch (dyn.d_tag) | |
2905 | { | |
2906 | default: | |
2907 | break; | |
2908 | ||
2909 | case DT_PLTGOT: | |
2910 | name = ".got"; | |
2911 | goto get_vma; | |
2912 | case DT_JMPREL: | |
2913 | name = ".rel.plt"; | |
2914 | get_vma: | |
2915 | s = bfd_get_section_by_name (output_bfd, name); | |
2916 | BFD_ASSERT (s != NULL); | |
2917 | dyn.d_un.d_ptr = s->vma; | |
2918 | bfd_elf32_swap_dyn_out (output_bfd, &dyn, dyncon); | |
2919 | break; | |
2920 | ||
2921 | case DT_PLTRELSZ: | |
2922 | s = bfd_get_section_by_name (output_bfd, ".rel.plt"); | |
2923 | BFD_ASSERT (s != NULL); | |
2924 | if (s->_cooked_size != 0) | |
2925 | dyn.d_un.d_val = s->_cooked_size; | |
2926 | else | |
2927 | dyn.d_un.d_val = s->_raw_size; | |
2928 | bfd_elf32_swap_dyn_out (output_bfd, &dyn, dyncon); | |
2929 | break; | |
2930 | ||
2931 | case DT_RELSZ: | |
2932 | /* My reading of the SVR4 ABI indicates that the | |
2933 | procedure linkage table relocs (DT_JMPREL) should be | |
2934 | included in the overall relocs (DT_REL). This is | |
2935 | what Solaris does. However, UnixWare can not handle | |
2936 | that case. Therefore, we override the DT_RELSZ entry | |
2937 | here to make it not include the JMPREL relocs. Since | |
2938 | the linker script arranges for .rel.plt to follow all | |
2939 | other relocation sections, we don't have to worry | |
2940 | about changing the DT_REL entry. */ | |
2941 | s = bfd_get_section_by_name (output_bfd, ".rel.plt"); | |
2942 | if (s != NULL) | |
2943 | { | |
2944 | if (s->_cooked_size != 0) | |
2945 | dyn.d_un.d_val -= s->_cooked_size; | |
2946 | else | |
2947 | dyn.d_un.d_val -= s->_raw_size; | |
2948 | } | |
2949 | bfd_elf32_swap_dyn_out (output_bfd, &dyn, dyncon); | |
2950 | break; | |
2951 | } | |
2952 | } | |
2953 | ||
2954 | /* Fill in the first entry in the procedure linkage table. */ | |
2955 | if (splt->_raw_size > 0) | |
2956 | memcpy (splt->contents, elf32_arm_plt0_entry, PLT_ENTRY_SIZE); | |
2957 | ||
2958 | /* UnixWare sets the entsize of .plt to 4, although that doesn't | |
2959 | really seem like the right value. */ | |
2960 | elf_section_data (splt->output_section)->this_hdr.sh_entsize = 4; | |
2961 | } | |
2962 | ||
2963 | /* Fill in the first three entries in the global offset table. */ | |
2964 | if (sgot->_raw_size > 0) | |
2965 | { | |
2966 | if (sdyn == NULL) | |
2967 | bfd_put_32 (output_bfd, (bfd_vma) 0, sgot->contents); | |
2968 | else | |
2969 | bfd_put_32 (output_bfd, | |
2970 | sdyn->output_section->vma + sdyn->output_offset, | |
2971 | sgot->contents); | |
2972 | bfd_put_32 (output_bfd, (bfd_vma) 0, sgot->contents + 4); | |
2973 | bfd_put_32 (output_bfd, (bfd_vma) 0, sgot->contents + 8); | |
2974 | } | |
2975 | ||
2976 | elf_section_data (sgot->output_section)->this_hdr.sh_entsize = 4; | |
2977 | ||
2978 | return true; | |
2979 | } | |
2980 | ||
2981 | #define ELF_ARCH bfd_arch_arm | |
2982 | #define ELF_MACHINE_CODE EM_ARM | |
2983 | #define ELF_MAXPAGE_SIZE 0x8000 | |
2984 | ||
2985 | ||
2986 | #define bfd_elf32_bfd_copy_private_bfd_data elf32_arm_copy_private_bfd_data | |
2987 | #define bfd_elf32_bfd_merge_private_bfd_data elf32_arm_merge_private_bfd_data | |
2988 | #define bfd_elf32_bfd_set_private_flags elf32_arm_set_private_flags | |
2989 | #define bfd_elf32_bfd_print_private_bfd_data elf32_arm_print_private_bfd_data | |
2990 | #define bfd_elf32_bfd_link_hash_table_create elf32_arm_link_hash_table_create | |
2991 | #define bfd_elf32_bfd_reloc_type_lookup elf32_arm_reloc_type_lookup | |
2992 | #define bfd_elf32_find_nearest_line elf32_arm_find_nearest_line | |
2993 | ||
2994 | #define elf_backend_get_symbol_type elf32_arm_get_symbol_type | |
2995 | #define elf_backend_gc_mark_hook elf32_arm_gc_mark_hook | |
2996 | #define elf_backend_gc_sweep_hook elf32_arm_gc_sweep_hook | |
2997 | #define elf_backend_check_relocs elf32_arm_check_relocs | |
2998 | #define elf_backend_relocate_section elf32_arm_relocate_section | |
2999 | #define elf_backend_adjust_dynamic_symbol elf32_arm_adjust_dynamic_symbol | |
3000 | #define elf_backend_create_dynamic_sections _bfd_elf_create_dynamic_sections | |
3001 | #define elf_backend_finish_dynamic_symbol elf32_arm_finish_dynamic_symbol | |
3002 | #define elf_backend_finish_dynamic_sections elf32_arm_finish_dynamic_sections | |
3003 | #define elf_backend_size_dynamic_sections elf32_arm_size_dynamic_sections | |
3004 | ||
3005 | #define elf_backend_can_gc_sections 1 | |
3006 | #define elf_backend_plt_readonly 1 | |
3007 | #define elf_backend_want_got_plt 1 | |
3008 | #define elf_backend_want_plt_sym 0 | |
3009 | ||
3010 | #include "elf32-target.h" |