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252b5132 | 1 | /* 32-bit ELF support for ARM |
ce855c42 | 2 | Copyright 1998, 1999, 2000 Free Software Foundation, Inc. |
252b5132 RH |
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 | ||
252b5132 RH |
20 | typedef unsigned long int insn32; |
21 | typedef unsigned short int insn16; | |
22 | ||
23 | static boolean elf32_arm_set_private_flags | |
24 | PARAMS ((bfd *, flagword)); | |
25 | static boolean elf32_arm_copy_private_bfd_data | |
26 | PARAMS ((bfd *, bfd *)); | |
27 | static boolean elf32_arm_merge_private_bfd_data | |
28 | PARAMS ((bfd *, bfd *)); | |
29 | static boolean elf32_arm_print_private_bfd_data | |
30 | PARAMS ((bfd *, PTR)); | |
f21f3fe0 | 31 | static int elf32_arm_get_symbol_type |
252b5132 RH |
32 | PARAMS (( Elf_Internal_Sym *, int)); |
33 | static struct bfd_link_hash_table *elf32_arm_link_hash_table_create | |
34 | PARAMS ((bfd *)); | |
35 | static bfd_reloc_status_type elf32_arm_final_link_relocate | |
780a67af NC |
36 | PARAMS ((reloc_howto_type *, bfd *, bfd *, asection *, bfd_byte *, |
37 | Elf_Internal_Rela *, bfd_vma, struct bfd_link_info *, asection *, | |
38 | const char *, unsigned char, struct elf_link_hash_entry *)); | |
252b5132 RH |
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 *)); | |
ba96a88f NC |
49 | static void elf32_arm_post_process_headers |
50 | PARAMS ((bfd *, struct bfd_link_info *)); | |
bcbdc74c NC |
51 | static int elf32_arm_to_thumb_stub |
52 | PARAMS ((struct bfd_link_info *, const char *, bfd *, bfd *, asection *, | |
53 | bfd_byte *, asection *, bfd_vma, bfd_signed_vma, bfd_vma)); | |
54 | static int elf32_thumb_to_arm_stub | |
55 | PARAMS ((struct bfd_link_info *, const char *, bfd *, bfd *, asection *, | |
56 | bfd_byte *, asection *, bfd_vma, bfd_signed_vma, bfd_vma)); | |
252b5132 | 57 | |
9b485d32 NC |
58 | #define INTERWORK_FLAG(abfd) (elf_elfheader (abfd)->e_flags & EF_INTERWORK) |
59 | ||
252b5132 RH |
60 | /* The linker script knows the section names for placement. |
61 | The entry_names are used to do simple name mangling on the stubs. | |
62 | Given a function name, and its type, the stub can be found. The | |
9b485d32 | 63 | name can be changed. The only requirement is the %s be present. */ |
252b5132 RH |
64 | #define THUMB2ARM_GLUE_SECTION_NAME ".glue_7t" |
65 | #define THUMB2ARM_GLUE_ENTRY_NAME "__%s_from_thumb" | |
66 | ||
67 | #define ARM2THUMB_GLUE_SECTION_NAME ".glue_7" | |
68 | #define ARM2THUMB_GLUE_ENTRY_NAME "__%s_from_arm" | |
69 | ||
70 | /* The name of the dynamic interpreter. This is put in the .interp | |
71 | section. */ | |
72 | #define ELF_DYNAMIC_INTERPRETER "/usr/lib/ld.so.1" | |
73 | ||
74 | /* The size in bytes of an entry in the procedure linkage table. */ | |
252b5132 RH |
75 | #define PLT_ENTRY_SIZE 16 |
76 | ||
77 | /* The first entry in a procedure linkage table looks like | |
78 | this. It is set up so that any shared library function that is | |
59f2c4e7 | 79 | called before the relocation has been set up calls the dynamic |
9b485d32 | 80 | linker first. */ |
252b5132 RH |
81 | static const bfd_byte elf32_arm_plt0_entry [PLT_ENTRY_SIZE] = |
82 | { | |
83 | 0x04, 0xe0, 0x2d, 0xe5, /* str lr, [sp, #-4]! */ | |
84 | 0x10, 0xe0, 0x9f, 0xe5, /* ldr lr, [pc, #16] */ | |
85 | 0x0e, 0xe0, 0x8f, 0xe0, /* adr lr, pc, lr */ | |
59f2c4e7 | 86 | 0x08, 0xf0, 0xbe, 0xe5 /* ldr pc, [lr, #8]! */ |
252b5132 RH |
87 | }; |
88 | ||
89 | /* Subsequent entries in a procedure linkage table look like | |
90 | this. */ | |
252b5132 RH |
91 | static const bfd_byte elf32_arm_plt_entry [PLT_ENTRY_SIZE] = |
92 | { | |
93 | 0x04, 0xc0, 0x9f, 0xe5, /* ldr ip, [pc, #4] */ | |
94 | 0x0c, 0xc0, 0x8f, 0xe0, /* add ip, pc, ip */ | |
95 | 0x00, 0xf0, 0x9c, 0xe5, /* ldr pc, [ip] */ | |
96 | 0x00, 0x00, 0x00, 0x00 /* offset to symbol in got */ | |
97 | }; | |
98 | ||
252b5132 RH |
99 | /* The ARM linker needs to keep track of the number of relocs that it |
100 | decides to copy in check_relocs for each symbol. This is so that | |
101 | it can discard PC relative relocs if it doesn't need them when | |
102 | linking with -Bsymbolic. We store the information in a field | |
103 | extending the regular ELF linker hash table. */ | |
104 | ||
105 | /* This structure keeps track of the number of PC relative relocs we | |
106 | have copied for a given symbol. */ | |
252b5132 RH |
107 | struct elf32_arm_pcrel_relocs_copied |
108 | { | |
109 | /* Next section. */ | |
110 | struct elf32_arm_pcrel_relocs_copied * next; | |
111 | /* A section in dynobj. */ | |
112 | asection * section; | |
113 | /* Number of relocs copied in this section. */ | |
114 | bfd_size_type count; | |
115 | }; | |
116 | ||
ba96a88f | 117 | /* Arm ELF linker hash entry. */ |
252b5132 RH |
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. */ | |
252b5132 RH |
127 | static boolean elf32_arm_discard_copies |
128 | PARAMS ((struct elf32_arm_link_hash_entry *, PTR)); | |
129 | ||
130 | /* Traverse an arm ELF linker hash table. */ | |
252b5132 RH |
131 | #define elf32_arm_link_hash_traverse(table, func, info) \ |
132 | (elf_link_hash_traverse \ | |
133 | (&(table)->root, \ | |
134 | (boolean (*) PARAMS ((struct elf_link_hash_entry *, PTR))) (func), \ | |
135 | (info))) | |
136 | ||
137 | /* Get the ARM elf linker hash table from a link_info structure. */ | |
138 | #define elf32_arm_hash_table(info) \ | |
139 | ((struct elf32_arm_link_hash_table *) ((info)->hash)) | |
140 | ||
9b485d32 | 141 | /* ARM ELF linker hash table. */ |
252b5132 | 142 | struct elf32_arm_link_hash_table |
9b485d32 NC |
143 | { |
144 | /* The main hash table. */ | |
145 | struct elf_link_hash_table root; | |
252b5132 | 146 | |
9b485d32 NC |
147 | /* The size in bytes of the section containg the Thumb-to-ARM glue. */ |
148 | long int thumb_glue_size; | |
252b5132 | 149 | |
9b485d32 NC |
150 | /* The size in bytes of the section containg the ARM-to-Thumb glue. */ |
151 | long int arm_glue_size; | |
252b5132 | 152 | |
9b485d32 NC |
153 | /* An arbitary input BFD chosen to hold the glue sections. */ |
154 | bfd * bfd_of_glue_owner; | |
ba96a88f | 155 | |
9b485d32 NC |
156 | /* A boolean indicating whether knowledge of the ARM's pipeline |
157 | length should be applied by the linker. */ | |
158 | int no_pipeline_knowledge; | |
159 | }; | |
252b5132 | 160 | |
780a67af NC |
161 | /* Create an entry in an ARM ELF linker hash table. */ |
162 | ||
163 | static struct bfd_hash_entry * | |
164 | elf32_arm_link_hash_newfunc (entry, table, string) | |
165 | struct bfd_hash_entry * entry; | |
166 | struct bfd_hash_table * table; | |
167 | const char * string; | |
168 | { | |
169 | struct elf32_arm_link_hash_entry * ret = | |
170 | (struct elf32_arm_link_hash_entry *) entry; | |
171 | ||
172 | /* Allocate the structure if it has not already been allocated by a | |
173 | subclass. */ | |
174 | if (ret == (struct elf32_arm_link_hash_entry *) NULL) | |
175 | ret = ((struct elf32_arm_link_hash_entry *) | |
176 | bfd_hash_allocate (table, | |
177 | sizeof (struct elf32_arm_link_hash_entry))); | |
178 | if (ret == (struct elf32_arm_link_hash_entry *) NULL) | |
179 | return (struct bfd_hash_entry *) ret; | |
180 | ||
181 | /* Call the allocation method of the superclass. */ | |
182 | ret = ((struct elf32_arm_link_hash_entry *) | |
183 | _bfd_elf_link_hash_newfunc ((struct bfd_hash_entry *) ret, | |
184 | table, string)); | |
185 | if (ret != (struct elf32_arm_link_hash_entry *) NULL) | |
186 | ret->pcrel_relocs_copied = NULL; | |
187 | ||
188 | return (struct bfd_hash_entry *) ret; | |
189 | } | |
190 | ||
9b485d32 | 191 | /* Create an ARM elf linker hash table. */ |
252b5132 RH |
192 | |
193 | static struct bfd_link_hash_table * | |
194 | elf32_arm_link_hash_table_create (abfd) | |
195 | bfd *abfd; | |
196 | { | |
197 | struct elf32_arm_link_hash_table *ret; | |
198 | ||
199 | ret = ((struct elf32_arm_link_hash_table *) | |
200 | bfd_alloc (abfd, sizeof (struct elf32_arm_link_hash_table))); | |
201 | if (ret == (struct elf32_arm_link_hash_table *) NULL) | |
202 | return NULL; | |
203 | ||
204 | if (!_bfd_elf_link_hash_table_init (&ret->root, abfd, | |
780a67af | 205 | elf32_arm_link_hash_newfunc)) |
252b5132 RH |
206 | { |
207 | bfd_release (abfd, ret); | |
208 | return NULL; | |
209 | } | |
210 | ||
211 | ret->thumb_glue_size = 0; | |
212 | ret->arm_glue_size = 0; | |
213 | ret->bfd_of_glue_owner = NULL; | |
ba96a88f | 214 | ret->no_pipeline_knowledge = 0; |
252b5132 RH |
215 | |
216 | return &ret->root.root; | |
217 | } | |
218 | ||
9b485d32 NC |
219 | /* Locate the Thumb encoded calling stub for NAME. */ |
220 | ||
252b5132 RH |
221 | static struct elf_link_hash_entry * |
222 | find_thumb_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 *hash; | |
229 | struct elf32_arm_link_hash_table *hash_table; | |
230 | ||
231 | /* We need a pointer to the armelf specific hash table. */ | |
232 | hash_table = elf32_arm_hash_table (link_info); | |
233 | ||
252b5132 RH |
234 | tmp_name = ((char *) |
235 | bfd_malloc (strlen (name) + strlen (THUMB2ARM_GLUE_ENTRY_NAME) + 1)); | |
236 | ||
237 | BFD_ASSERT (tmp_name); | |
238 | ||
239 | sprintf (tmp_name, THUMB2ARM_GLUE_ENTRY_NAME, name); | |
240 | ||
241 | hash = elf_link_hash_lookup | |
242 | (&(hash_table)->root, tmp_name, false, false, true); | |
243 | ||
244 | if (hash == NULL) | |
245 | /* xgettext:c-format */ | |
9b485d32 | 246 | _bfd_error_handler (_("%s: unable to find THUMB glue '%s' for `%s'"), |
252b5132 RH |
247 | bfd_get_filename (input_bfd), tmp_name, name); |
248 | ||
249 | free (tmp_name); | |
250 | ||
251 | return hash; | |
252 | } | |
253 | ||
9b485d32 NC |
254 | /* Locate the ARM encoded calling stub for NAME. */ |
255 | ||
252b5132 RH |
256 | static struct elf_link_hash_entry * |
257 | find_arm_glue (link_info, name, input_bfd) | |
258 | struct bfd_link_info *link_info; | |
259 | CONST char *name; | |
260 | bfd *input_bfd; | |
261 | { | |
262 | char *tmp_name; | |
263 | struct elf_link_hash_entry *myh; | |
264 | struct elf32_arm_link_hash_table *hash_table; | |
265 | ||
266 | /* We need a pointer to the elfarm specific hash table. */ | |
267 | hash_table = elf32_arm_hash_table (link_info); | |
268 | ||
269 | tmp_name = ((char *) | |
270 | bfd_malloc (strlen (name) + strlen (ARM2THUMB_GLUE_ENTRY_NAME) + 1)); | |
271 | ||
272 | BFD_ASSERT (tmp_name); | |
273 | ||
274 | sprintf (tmp_name, ARM2THUMB_GLUE_ENTRY_NAME, name); | |
275 | ||
276 | myh = elf_link_hash_lookup | |
277 | (&(hash_table)->root, tmp_name, false, false, true); | |
278 | ||
279 | if (myh == NULL) | |
280 | /* xgettext:c-format */ | |
9b485d32 | 281 | _bfd_error_handler (_("%s: unable to find ARM glue '%s' for `%s'"), |
252b5132 RH |
282 | bfd_get_filename (input_bfd), tmp_name, name); |
283 | ||
284 | free (tmp_name); | |
285 | ||
286 | return myh; | |
287 | } | |
288 | ||
9b485d32 | 289 | /* ARM->Thumb glue: |
252b5132 RH |
290 | |
291 | .arm | |
292 | __func_from_arm: | |
293 | ldr r12, __func_addr | |
294 | bx r12 | |
295 | __func_addr: | |
9b485d32 | 296 | .word func @ behave as if you saw a ARM_32 reloc. */ |
252b5132 RH |
297 | |
298 | #define ARM2THUMB_GLUE_SIZE 12 | |
299 | static const insn32 a2t1_ldr_insn = 0xe59fc000; | |
300 | static const insn32 a2t2_bx_r12_insn = 0xe12fff1c; | |
301 | static const insn32 a2t3_func_addr_insn = 0x00000001; | |
302 | ||
9b485d32 | 303 | /* Thumb->ARM: Thumb->(non-interworking aware) ARM |
252b5132 RH |
304 | |
305 | .thumb .thumb | |
306 | .align 2 .align 2 | |
307 | __func_from_thumb: __func_from_thumb: | |
308 | bx pc push {r6, lr} | |
309 | nop ldr r6, __func_addr | |
310 | .arm mov lr, pc | |
311 | __func_change_to_arm: bx r6 | |
312 | b func .arm | |
313 | __func_back_to_thumb: | |
314 | ldmia r13! {r6, lr} | |
315 | bx lr | |
316 | __func_addr: | |
9b485d32 | 317 | .word func */ |
252b5132 RH |
318 | |
319 | #define THUMB2ARM_GLUE_SIZE 8 | |
320 | static const insn16 t2a1_bx_pc_insn = 0x4778; | |
321 | static const insn16 t2a2_noop_insn = 0x46c0; | |
322 | static const insn32 t2a3_b_insn = 0xea000000; | |
323 | ||
324 | static const insn16 t2a1_push_insn = 0xb540; | |
325 | static const insn16 t2a2_ldr_insn = 0x4e03; | |
326 | static const insn16 t2a3_mov_insn = 0x46fe; | |
327 | static const insn16 t2a4_bx_insn = 0x4730; | |
328 | static const insn32 t2a5_pop_insn = 0xe8bd4040; | |
329 | static const insn32 t2a6_bx_insn = 0xe12fff1e; | |
330 | ||
331 | boolean | |
332 | bfd_elf32_arm_allocate_interworking_sections (info) | |
333 | struct bfd_link_info * info; | |
334 | { | |
335 | asection * s; | |
336 | bfd_byte * foo; | |
337 | struct elf32_arm_link_hash_table * globals; | |
338 | ||
339 | globals = elf32_arm_hash_table (info); | |
340 | ||
341 | BFD_ASSERT (globals != NULL); | |
342 | ||
343 | if (globals->arm_glue_size != 0) | |
344 | { | |
345 | BFD_ASSERT (globals->bfd_of_glue_owner != NULL); | |
346 | ||
347 | s = bfd_get_section_by_name | |
348 | (globals->bfd_of_glue_owner, ARM2THUMB_GLUE_SECTION_NAME); | |
349 | ||
350 | BFD_ASSERT (s != NULL); | |
351 | ||
352 | foo = (bfd_byte *) bfd_alloc | |
353 | (globals->bfd_of_glue_owner, globals->arm_glue_size); | |
354 | ||
355 | s->_raw_size = s->_cooked_size = globals->arm_glue_size; | |
356 | s->contents = foo; | |
357 | } | |
358 | ||
359 | if (globals->thumb_glue_size != 0) | |
360 | { | |
361 | BFD_ASSERT (globals->bfd_of_glue_owner != NULL); | |
362 | ||
363 | s = bfd_get_section_by_name | |
364 | (globals->bfd_of_glue_owner, THUMB2ARM_GLUE_SECTION_NAME); | |
365 | ||
366 | BFD_ASSERT (s != NULL); | |
367 | ||
368 | foo = (bfd_byte *) bfd_alloc | |
369 | (globals->bfd_of_glue_owner, globals->thumb_glue_size); | |
370 | ||
371 | s->_raw_size = s->_cooked_size = globals->thumb_glue_size; | |
372 | s->contents = foo; | |
373 | } | |
374 | ||
375 | return true; | |
376 | } | |
377 | ||
378 | static void | |
379 | record_arm_to_thumb_glue (link_info, h) | |
380 | struct bfd_link_info * link_info; | |
381 | struct elf_link_hash_entry * h; | |
382 | { | |
383 | const char * name = h->root.root.string; | |
384 | register asection * s; | |
385 | char * tmp_name; | |
386 | struct elf_link_hash_entry * myh; | |
387 | struct elf32_arm_link_hash_table * globals; | |
388 | ||
389 | globals = elf32_arm_hash_table (link_info); | |
390 | ||
391 | BFD_ASSERT (globals != NULL); | |
392 | BFD_ASSERT (globals->bfd_of_glue_owner != NULL); | |
393 | ||
394 | s = bfd_get_section_by_name | |
395 | (globals->bfd_of_glue_owner, ARM2THUMB_GLUE_SECTION_NAME); | |
396 | ||
252b5132 RH |
397 | BFD_ASSERT (s != NULL); |
398 | ||
399 | tmp_name = ((char *) | |
400 | bfd_malloc (strlen (name) + strlen (ARM2THUMB_GLUE_ENTRY_NAME) + 1)); | |
401 | ||
402 | BFD_ASSERT (tmp_name); | |
403 | ||
404 | sprintf (tmp_name, ARM2THUMB_GLUE_ENTRY_NAME, name); | |
405 | ||
406 | myh = elf_link_hash_lookup | |
407 | (&(globals)->root, tmp_name, false, false, true); | |
408 | ||
409 | if (myh != NULL) | |
410 | { | |
9b485d32 | 411 | /* We've already seen this guy. */ |
252b5132 | 412 | free (tmp_name); |
9b485d32 | 413 | return; |
252b5132 RH |
414 | } |
415 | ||
416 | /* The only trick here is using hash_table->arm_glue_size as the value. Even | |
417 | though the section isn't allocated yet, this is where we will be putting | |
418 | it. */ | |
252b5132 RH |
419 | _bfd_generic_link_add_one_symbol (link_info, globals->bfd_of_glue_owner, tmp_name, |
420 | BSF_GLOBAL, | |
421 | s, globals->arm_glue_size + 1, | |
422 | NULL, true, false, | |
423 | (struct bfd_link_hash_entry **) &myh); | |
424 | ||
425 | free (tmp_name); | |
426 | ||
427 | globals->arm_glue_size += ARM2THUMB_GLUE_SIZE; | |
428 | ||
429 | return; | |
430 | } | |
431 | ||
432 | static void | |
433 | record_thumb_to_arm_glue (link_info, h) | |
434 | struct bfd_link_info *link_info; | |
435 | struct elf_link_hash_entry *h; | |
436 | { | |
437 | const char *name = h->root.root.string; | |
438 | register asection *s; | |
439 | char *tmp_name; | |
440 | struct elf_link_hash_entry *myh; | |
441 | struct elf32_arm_link_hash_table *hash_table; | |
442 | char bind; | |
443 | ||
444 | hash_table = elf32_arm_hash_table (link_info); | |
445 | ||
446 | BFD_ASSERT (hash_table != NULL); | |
447 | BFD_ASSERT (hash_table->bfd_of_glue_owner != NULL); | |
448 | ||
449 | s = bfd_get_section_by_name | |
450 | (hash_table->bfd_of_glue_owner, THUMB2ARM_GLUE_SECTION_NAME); | |
451 | ||
452 | BFD_ASSERT (s != NULL); | |
453 | ||
454 | tmp_name = (char *) bfd_malloc (strlen (name) + strlen (THUMB2ARM_GLUE_ENTRY_NAME) + 1); | |
455 | ||
456 | BFD_ASSERT (tmp_name); | |
457 | ||
458 | sprintf (tmp_name, THUMB2ARM_GLUE_ENTRY_NAME, name); | |
459 | ||
460 | myh = elf_link_hash_lookup | |
461 | (&(hash_table)->root, tmp_name, false, false, true); | |
462 | ||
463 | if (myh != NULL) | |
464 | { | |
9b485d32 | 465 | /* We've already seen this guy. */ |
252b5132 | 466 | free (tmp_name); |
9b485d32 | 467 | return; |
252b5132 RH |
468 | } |
469 | ||
470 | _bfd_generic_link_add_one_symbol (link_info, hash_table->bfd_of_glue_owner, tmp_name, | |
471 | BSF_GLOBAL, s, hash_table->thumb_glue_size + 1, | |
472 | NULL, true, false, | |
473 | (struct bfd_link_hash_entry **) &myh); | |
474 | ||
9b485d32 | 475 | /* If we mark it 'Thumb', the disassembler will do a better job. */ |
252b5132 RH |
476 | bind = ELF_ST_BIND (myh->type); |
477 | myh->type = ELF_ST_INFO (bind, STT_ARM_TFUNC); | |
478 | ||
479 | free (tmp_name); | |
480 | ||
252b5132 RH |
481 | #define CHANGE_TO_ARM "__%s_change_to_arm" |
482 | #define BACK_FROM_ARM "__%s_back_from_arm" | |
483 | ||
9b485d32 | 484 | /* Allocate another symbol to mark where we switch to Arm mode. */ |
252b5132 RH |
485 | tmp_name = (char *) bfd_malloc (strlen (name) + strlen (CHANGE_TO_ARM) + 1); |
486 | ||
487 | BFD_ASSERT (tmp_name); | |
488 | ||
489 | sprintf (tmp_name, CHANGE_TO_ARM, name); | |
490 | ||
491 | myh = NULL; | |
492 | ||
493 | _bfd_generic_link_add_one_symbol (link_info, hash_table->bfd_of_glue_owner, tmp_name, | |
494 | BSF_LOCAL, s, hash_table->thumb_glue_size + 4, | |
495 | NULL, true, false, | |
496 | (struct bfd_link_hash_entry **) &myh); | |
497 | ||
498 | free (tmp_name); | |
499 | ||
500 | hash_table->thumb_glue_size += THUMB2ARM_GLUE_SIZE; | |
501 | ||
502 | return; | |
503 | } | |
504 | ||
505 | /* Select a BFD to be used to hold the sections used by the glue code. | |
506 | This function is called from the linker scripts in ld/emultempl/ | |
507 | {armelf/pe}.em */ | |
9b485d32 | 508 | |
252b5132 RH |
509 | boolean |
510 | bfd_elf32_arm_get_bfd_for_interworking (abfd, info) | |
511 | bfd *abfd; | |
512 | struct bfd_link_info *info; | |
513 | { | |
514 | struct elf32_arm_link_hash_table *globals; | |
515 | flagword flags; | |
516 | asection *sec; | |
517 | ||
518 | /* If we are only performing a partial link do not bother | |
519 | getting a bfd to hold the glue. */ | |
520 | if (info->relocateable) | |
521 | return true; | |
522 | ||
523 | globals = elf32_arm_hash_table (info); | |
524 | ||
525 | BFD_ASSERT (globals != NULL); | |
526 | ||
527 | if (globals->bfd_of_glue_owner != NULL) | |
528 | return true; | |
529 | ||
530 | sec = bfd_get_section_by_name (abfd, ARM2THUMB_GLUE_SECTION_NAME); | |
531 | ||
532 | if (sec == NULL) | |
533 | { | |
57db232e NC |
534 | /* Note: we do not include the flag SEC_LINKER_CREATED, as this |
535 | will prevent elf_link_input_bfd() from processing the contents | |
536 | of this section. */ | |
811b4bf6 | 537 | flags = SEC_ALLOC | SEC_LOAD | SEC_HAS_CONTENTS | SEC_IN_MEMORY | SEC_CODE | SEC_READONLY; |
252b5132 RH |
538 | |
539 | sec = bfd_make_section (abfd, ARM2THUMB_GLUE_SECTION_NAME); | |
540 | ||
541 | if (sec == NULL | |
542 | || !bfd_set_section_flags (abfd, sec, flags) | |
543 | || !bfd_set_section_alignment (abfd, sec, 2)) | |
544 | return false; | |
9a5aca8c | 545 | |
57db232e NC |
546 | /* Set the gc mark to prevent the section from being removed by garbage |
547 | collection, despite the fact that no relocs refer to this section. */ | |
548 | sec->gc_mark = 1; | |
252b5132 RH |
549 | } |
550 | ||
551 | sec = bfd_get_section_by_name (abfd, THUMB2ARM_GLUE_SECTION_NAME); | |
552 | ||
553 | if (sec == NULL) | |
554 | { | |
811b4bf6 | 555 | flags = SEC_ALLOC | SEC_LOAD | SEC_HAS_CONTENTS | SEC_IN_MEMORY | SEC_CODE | SEC_READONLY; |
252b5132 RH |
556 | |
557 | sec = bfd_make_section (abfd, THUMB2ARM_GLUE_SECTION_NAME); | |
558 | ||
559 | if (sec == NULL | |
560 | || !bfd_set_section_flags (abfd, sec, flags) | |
561 | || !bfd_set_section_alignment (abfd, sec, 2)) | |
562 | return false; | |
9a5aca8c | 563 | |
57db232e | 564 | sec->gc_mark = 1; |
252b5132 RH |
565 | } |
566 | ||
567 | /* Save the bfd for later use. */ | |
568 | globals->bfd_of_glue_owner = abfd; | |
569 | ||
570 | return true; | |
571 | } | |
572 | ||
573 | boolean | |
ba96a88f | 574 | bfd_elf32_arm_process_before_allocation (abfd, link_info, no_pipeline_knowledge) |
252b5132 RH |
575 | bfd *abfd; |
576 | struct bfd_link_info *link_info; | |
ba96a88f | 577 | int no_pipeline_knowledge; |
252b5132 RH |
578 | { |
579 | Elf_Internal_Shdr *symtab_hdr; | |
580 | Elf_Internal_Rela *free_relocs = NULL; | |
581 | Elf_Internal_Rela *irel, *irelend; | |
582 | bfd_byte *contents = NULL; | |
583 | bfd_byte *free_contents = NULL; | |
584 | Elf32_External_Sym *extsyms = NULL; | |
585 | Elf32_External_Sym *free_extsyms = NULL; | |
586 | ||
587 | asection *sec; | |
588 | struct elf32_arm_link_hash_table *globals; | |
589 | ||
590 | /* If we are only performing a partial link do not bother | |
591 | to construct any glue. */ | |
592 | if (link_info->relocateable) | |
593 | return true; | |
594 | ||
595 | /* Here we have a bfd that is to be included on the link. We have a hook | |
596 | to do reloc rummaging, before section sizes are nailed down. */ | |
252b5132 RH |
597 | globals = elf32_arm_hash_table (link_info); |
598 | ||
599 | BFD_ASSERT (globals != NULL); | |
600 | BFD_ASSERT (globals->bfd_of_glue_owner != NULL); | |
601 | ||
ba96a88f | 602 | globals->no_pipeline_knowledge = no_pipeline_knowledge; |
f21f3fe0 | 603 | |
252b5132 RH |
604 | /* Rummage around all the relocs and map the glue vectors. */ |
605 | sec = abfd->sections; | |
606 | ||
607 | if (sec == NULL) | |
608 | return true; | |
609 | ||
610 | for (; sec != NULL; sec = sec->next) | |
611 | { | |
612 | if (sec->reloc_count == 0) | |
613 | continue; | |
614 | ||
615 | symtab_hdr = &elf_tdata (abfd)->symtab_hdr; | |
252b5132 | 616 | |
9b485d32 | 617 | /* Load the relocs. */ |
252b5132 RH |
618 | irel = (_bfd_elf32_link_read_relocs (abfd, sec, (PTR) NULL, |
619 | (Elf_Internal_Rela *) NULL, false)); | |
620 | ||
621 | BFD_ASSERT (irel != 0); | |
622 | ||
623 | irelend = irel + sec->reloc_count; | |
624 | for (; irel < irelend; irel++) | |
625 | { | |
626 | long r_type; | |
627 | unsigned long r_index; | |
252b5132 RH |
628 | |
629 | struct elf_link_hash_entry *h; | |
630 | ||
631 | r_type = ELF32_R_TYPE (irel->r_info); | |
632 | r_index = ELF32_R_SYM (irel->r_info); | |
633 | ||
9b485d32 | 634 | /* These are the only relocation types we care about. */ |
ba96a88f | 635 | if ( r_type != R_ARM_PC24 |
252b5132 RH |
636 | && r_type != R_ARM_THM_PC22) |
637 | continue; | |
638 | ||
639 | /* Get the section contents if we haven't done so already. */ | |
640 | if (contents == NULL) | |
641 | { | |
642 | /* Get cached copy if it exists. */ | |
643 | if (elf_section_data (sec)->this_hdr.contents != NULL) | |
644 | contents = elf_section_data (sec)->this_hdr.contents; | |
645 | else | |
646 | { | |
647 | /* Go get them off disk. */ | |
648 | contents = (bfd_byte *) bfd_malloc (sec->_raw_size); | |
649 | if (contents == NULL) | |
650 | goto error_return; | |
9b485d32 | 651 | |
252b5132 RH |
652 | free_contents = contents; |
653 | ||
654 | if (!bfd_get_section_contents (abfd, sec, contents, | |
655 | (file_ptr) 0, sec->_raw_size)) | |
656 | goto error_return; | |
657 | } | |
658 | } | |
659 | ||
660 | /* Read this BFD's symbols if we haven't done so already. */ | |
661 | if (extsyms == NULL) | |
662 | { | |
663 | /* Get cached copy if it exists. */ | |
664 | if (symtab_hdr->contents != NULL) | |
665 | extsyms = (Elf32_External_Sym *) symtab_hdr->contents; | |
666 | else | |
667 | { | |
668 | /* Go get them off disk. */ | |
669 | extsyms = ((Elf32_External_Sym *) | |
670 | bfd_malloc (symtab_hdr->sh_size)); | |
671 | if (extsyms == NULL) | |
672 | goto error_return; | |
9b485d32 | 673 | |
252b5132 | 674 | free_extsyms = extsyms; |
9b485d32 | 675 | |
252b5132 RH |
676 | if (bfd_seek (abfd, symtab_hdr->sh_offset, SEEK_SET) != 0 |
677 | || (bfd_read (extsyms, 1, symtab_hdr->sh_size, abfd) | |
678 | != symtab_hdr->sh_size)) | |
679 | goto error_return; | |
680 | } | |
681 | } | |
682 | ||
a7c10850 | 683 | /* If the relocation is not against a symbol it cannot concern us. */ |
252b5132 RH |
684 | h = NULL; |
685 | ||
9b485d32 | 686 | /* We don't care about local symbols. */ |
252b5132 RH |
687 | if (r_index < symtab_hdr->sh_info) |
688 | continue; | |
689 | ||
9b485d32 | 690 | /* This is an external symbol. */ |
252b5132 RH |
691 | r_index -= symtab_hdr->sh_info; |
692 | h = (struct elf_link_hash_entry *) | |
693 | elf_sym_hashes (abfd)[r_index]; | |
694 | ||
695 | /* If the relocation is against a static symbol it must be within | |
696 | the current section and so cannot be a cross ARM/Thumb relocation. */ | |
697 | if (h == NULL) | |
698 | continue; | |
699 | ||
700 | switch (r_type) | |
701 | { | |
702 | case R_ARM_PC24: | |
703 | /* This one is a call from arm code. We need to look up | |
2f0ca46a | 704 | the target of the call. If it is a thumb target, we |
252b5132 | 705 | insert glue. */ |
252b5132 RH |
706 | if (ELF_ST_TYPE(h->type) == STT_ARM_TFUNC) |
707 | record_arm_to_thumb_glue (link_info, h); | |
708 | break; | |
709 | ||
710 | case R_ARM_THM_PC22: | |
f21f3fe0 | 711 | /* This one is a call from thumb code. We look |
2f0ca46a | 712 | up the target of the call. If it is not a thumb |
bcbdc74c | 713 | target, we insert glue. */ |
252b5132 RH |
714 | if (ELF_ST_TYPE (h->type) != STT_ARM_TFUNC) |
715 | record_thumb_to_arm_glue (link_info, h); | |
716 | break; | |
717 | ||
718 | default: | |
719 | break; | |
720 | } | |
721 | } | |
722 | } | |
723 | ||
724 | return true; | |
9a5aca8c | 725 | |
252b5132 RH |
726 | error_return: |
727 | if (free_relocs != NULL) | |
728 | free (free_relocs); | |
729 | if (free_contents != NULL) | |
730 | free (free_contents); | |
731 | if (free_extsyms != NULL) | |
732 | free (free_extsyms); | |
9a5aca8c | 733 | |
252b5132 | 734 | return false; |
252b5132 RH |
735 | } |
736 | ||
737 | /* The thumb form of a long branch is a bit finicky, because the offset | |
738 | encoding is split over two fields, each in it's own instruction. They | |
f21f3fe0 | 739 | can occur in any order. So given a thumb form of long branch, and an |
252b5132 | 740 | offset, insert the offset into the thumb branch and return finished |
f21f3fe0 | 741 | instruction. |
252b5132 | 742 | |
f21f3fe0 | 743 | It takes two thumb instructions to encode the target address. Each has |
252b5132 | 744 | 11 bits to invest. The upper 11 bits are stored in one (identifed by |
f21f3fe0 UD |
745 | H-0.. see below), the lower 11 bits are stored in the other (identified |
746 | by H-1). | |
252b5132 | 747 | |
f21f3fe0 | 748 | Combine together and shifted left by 1 (it's a half word address) and |
252b5132 RH |
749 | there you have it. |
750 | ||
751 | Op: 1111 = F, | |
752 | H-0, upper address-0 = 000 | |
753 | Op: 1111 = F, | |
754 | H-1, lower address-0 = 800 | |
755 | ||
f21f3fe0 | 756 | They can be ordered either way, but the arm tools I've seen always put |
252b5132 RH |
757 | the lower one first. It probably doesn't matter. krk@cygnus.com |
758 | ||
759 | XXX: Actually the order does matter. The second instruction (H-1) | |
760 | moves the computed address into the PC, so it must be the second one | |
761 | in the sequence. The problem, however is that whilst little endian code | |
762 | stores the instructions in HI then LOW order, big endian code does the | |
dfc5f959 | 763 | reverse. nickc@cygnus.com. */ |
252b5132 | 764 | |
dfc5f959 NC |
765 | #define LOW_HI_ORDER 0xF800F000 |
766 | #define HI_LOW_ORDER 0xF000F800 | |
252b5132 RH |
767 | |
768 | static insn32 | |
769 | insert_thumb_branch (br_insn, rel_off) | |
770 | insn32 br_insn; | |
771 | int rel_off; | |
772 | { | |
773 | unsigned int low_bits; | |
774 | unsigned int high_bits; | |
775 | ||
252b5132 RH |
776 | BFD_ASSERT ((rel_off & 1) != 1); |
777 | ||
dfc5f959 NC |
778 | rel_off >>= 1; /* Half word aligned address. */ |
779 | low_bits = rel_off & 0x000007FF; /* The bottom 11 bits. */ | |
780 | high_bits = (rel_off >> 11) & 0x000007FF; /* The top 11 bits. */ | |
252b5132 RH |
781 | |
782 | if ((br_insn & LOW_HI_ORDER) == LOW_HI_ORDER) | |
783 | br_insn = LOW_HI_ORDER | (low_bits << 16) | high_bits; | |
784 | else if ((br_insn & HI_LOW_ORDER) == HI_LOW_ORDER) | |
785 | br_insn = HI_LOW_ORDER | (high_bits << 16) | low_bits; | |
786 | else | |
9b485d32 NC |
787 | /* FIXME: abort is probably not the right call. krk@cygnus.com */ |
788 | abort (); /* error - not a valid branch instruction form. */ | |
252b5132 | 789 | |
252b5132 RH |
790 | return br_insn; |
791 | } | |
792 | ||
9b485d32 NC |
793 | /* Thumb code calling an ARM function. */ |
794 | ||
252b5132 RH |
795 | static int |
796 | elf32_thumb_to_arm_stub (info, name, input_bfd, output_bfd, input_section, | |
797 | hit_data, sym_sec, offset, addend, val) | |
bcbdc74c NC |
798 | struct bfd_link_info * info; |
799 | const char * name; | |
800 | bfd * input_bfd; | |
801 | bfd * output_bfd; | |
802 | asection * input_section; | |
803 | bfd_byte * hit_data; | |
804 | asection * sym_sec; | |
805 | bfd_vma offset; | |
806 | bfd_signed_vma addend; | |
807 | bfd_vma val; | |
252b5132 | 808 | { |
bcbdc74c | 809 | asection * s = 0; |
252b5132 RH |
810 | long int my_offset; |
811 | unsigned long int tmp; | |
812 | long int ret_offset; | |
bcbdc74c NC |
813 | struct elf_link_hash_entry * myh; |
814 | struct elf32_arm_link_hash_table * globals; | |
252b5132 RH |
815 | |
816 | myh = find_thumb_glue (info, name, input_bfd); | |
817 | if (myh == NULL) | |
818 | return false; | |
819 | ||
820 | globals = elf32_arm_hash_table (info); | |
821 | ||
822 | BFD_ASSERT (globals != NULL); | |
823 | BFD_ASSERT (globals->bfd_of_glue_owner != NULL); | |
824 | ||
825 | my_offset = myh->root.u.def.value; | |
826 | ||
827 | s = bfd_get_section_by_name (globals->bfd_of_glue_owner, | |
828 | THUMB2ARM_GLUE_SECTION_NAME); | |
829 | ||
830 | BFD_ASSERT (s != NULL); | |
831 | BFD_ASSERT (s->contents != NULL); | |
832 | BFD_ASSERT (s->output_section != NULL); | |
833 | ||
834 | if ((my_offset & 0x01) == 0x01) | |
835 | { | |
836 | if (sym_sec != NULL | |
837 | && sym_sec->owner != NULL | |
838 | && !INTERWORK_FLAG (sym_sec->owner)) | |
839 | { | |
840 | _bfd_error_handler | |
9b485d32 | 841 | (_("%s(%s): warning: interworking not enabled."), |
252b5132 RH |
842 | bfd_get_filename (sym_sec->owner), name); |
843 | _bfd_error_handler | |
9b485d32 | 844 | (_(" first occurrence: %s: thumb call to arm"), |
252b5132 RH |
845 | bfd_get_filename (input_bfd)); |
846 | ||
847 | return false; | |
848 | } | |
849 | ||
850 | --my_offset; | |
851 | myh->root.u.def.value = my_offset; | |
852 | ||
853 | bfd_put_16 (output_bfd, t2a1_bx_pc_insn, | |
854 | s->contents + my_offset); | |
855 | ||
856 | bfd_put_16 (output_bfd, t2a2_noop_insn, | |
857 | s->contents + my_offset + 2); | |
858 | ||
859 | ret_offset = | |
9b485d32 NC |
860 | /* Address of destination of the stub. */ |
861 | ((bfd_signed_vma) val) | |
252b5132 | 862 | - ((bfd_signed_vma) |
9b485d32 NC |
863 | /* Offset from the start of the current section to the start of the stubs. */ |
864 | (s->output_offset | |
865 | /* Offset of the start of this stub from the start of the stubs. */ | |
866 | + my_offset | |
867 | /* Address of the start of the current section. */ | |
868 | + s->output_section->vma) | |
869 | /* The branch instruction is 4 bytes into the stub. */ | |
870 | + 4 | |
871 | /* ARM branches work from the pc of the instruction + 8. */ | |
872 | + 8); | |
252b5132 RH |
873 | |
874 | bfd_put_32 (output_bfd, | |
875 | t2a3_b_insn | ((ret_offset >> 2) & 0x00FFFFFF), | |
876 | s->contents + my_offset + 4); | |
877 | } | |
878 | ||
879 | BFD_ASSERT (my_offset <= globals->thumb_glue_size); | |
880 | ||
881 | /* Now go back and fix up the original BL insn to point | |
882 | to here. */ | |
883 | ret_offset = | |
884 | s->output_offset | |
885 | + my_offset | |
886 | - (input_section->output_offset | |
887 | + offset + addend) | |
756fa1b9 | 888 | - 8; |
252b5132 RH |
889 | |
890 | tmp = bfd_get_32 (input_bfd, hit_data | |
891 | - input_section->vma); | |
892 | ||
893 | bfd_put_32 (output_bfd, | |
894 | insert_thumb_branch (tmp, ret_offset), | |
895 | hit_data - input_section->vma); | |
896 | ||
897 | return true; | |
898 | } | |
899 | ||
9b485d32 NC |
900 | /* Arm code calling a Thumb function. */ |
901 | ||
252b5132 RH |
902 | static int |
903 | elf32_arm_to_thumb_stub (info, name, input_bfd, output_bfd, input_section, | |
904 | hit_data, sym_sec, offset, addend, val) | |
bcbdc74c NC |
905 | struct bfd_link_info * info; |
906 | const char * name; | |
907 | bfd * input_bfd; | |
908 | bfd * output_bfd; | |
909 | asection * input_section; | |
910 | bfd_byte * hit_data; | |
911 | asection * sym_sec; | |
912 | bfd_vma offset; | |
913 | bfd_signed_vma addend; | |
914 | bfd_vma val; | |
252b5132 RH |
915 | { |
916 | unsigned long int tmp; | |
917 | long int my_offset; | |
bcbdc74c | 918 | asection * s; |
252b5132 | 919 | long int ret_offset; |
bcbdc74c NC |
920 | struct elf_link_hash_entry * myh; |
921 | struct elf32_arm_link_hash_table * globals; | |
252b5132 RH |
922 | |
923 | myh = find_arm_glue (info, name, input_bfd); | |
924 | if (myh == NULL) | |
925 | return false; | |
926 | ||
927 | globals = elf32_arm_hash_table (info); | |
928 | ||
929 | BFD_ASSERT (globals != NULL); | |
930 | BFD_ASSERT (globals->bfd_of_glue_owner != NULL); | |
931 | ||
932 | my_offset = myh->root.u.def.value; | |
933 | s = bfd_get_section_by_name (globals->bfd_of_glue_owner, | |
934 | ARM2THUMB_GLUE_SECTION_NAME); | |
935 | BFD_ASSERT (s != NULL); | |
936 | BFD_ASSERT (s->contents != NULL); | |
937 | BFD_ASSERT (s->output_section != NULL); | |
938 | ||
939 | if ((my_offset & 0x01) == 0x01) | |
940 | { | |
941 | if (sym_sec != NULL | |
942 | && sym_sec->owner != NULL | |
943 | && !INTERWORK_FLAG (sym_sec->owner)) | |
944 | { | |
945 | _bfd_error_handler | |
9b485d32 | 946 | (_("%s(%s): warning: interworking not enabled."), |
252b5132 RH |
947 | bfd_get_filename (sym_sec->owner), name); |
948 | _bfd_error_handler | |
9b485d32 | 949 | (_(" first occurrence: %s: arm call to thumb"), |
252b5132 RH |
950 | bfd_get_filename (input_bfd)); |
951 | } | |
9b485d32 | 952 | |
252b5132 RH |
953 | --my_offset; |
954 | myh->root.u.def.value = my_offset; | |
955 | ||
956 | bfd_put_32 (output_bfd, a2t1_ldr_insn, | |
957 | s->contents + my_offset); | |
958 | ||
959 | bfd_put_32 (output_bfd, a2t2_bx_r12_insn, | |
960 | s->contents + my_offset + 4); | |
961 | ||
962 | /* It's a thumb address. Add the low order bit. */ | |
963 | bfd_put_32 (output_bfd, val | a2t3_func_addr_insn, | |
964 | s->contents + my_offset + 8); | |
965 | } | |
966 | ||
967 | BFD_ASSERT (my_offset <= globals->arm_glue_size); | |
968 | ||
969 | tmp = bfd_get_32 (input_bfd, hit_data); | |
970 | tmp = tmp & 0xFF000000; | |
971 | ||
9b485d32 | 972 | /* Somehow these are both 4 too far, so subtract 8. */ |
252b5132 RH |
973 | ret_offset = s->output_offset |
974 | + my_offset | |
975 | + s->output_section->vma | |
976 | - (input_section->output_offset | |
977 | + input_section->output_section->vma | |
978 | + offset + addend) | |
979 | - 8; | |
9a5aca8c | 980 | |
252b5132 RH |
981 | tmp = tmp | ((ret_offset >> 2) & 0x00FFFFFF); |
982 | ||
983 | bfd_put_32 (output_bfd, tmp, hit_data | |
984 | - input_section->vma); | |
985 | ||
252b5132 RH |
986 | return true; |
987 | } | |
988 | ||
989 | /* Perform a relocation as part of a final link. */ | |
9b485d32 | 990 | |
252b5132 RH |
991 | static bfd_reloc_status_type |
992 | elf32_arm_final_link_relocate (howto, input_bfd, output_bfd, | |
993 | input_section, contents, rel, value, | |
780a67af | 994 | info, sym_sec, sym_name, sym_flags, h) |
252b5132 RH |
995 | reloc_howto_type * howto; |
996 | bfd * input_bfd; | |
997 | bfd * output_bfd; | |
998 | asection * input_section; | |
999 | bfd_byte * contents; | |
1000 | Elf_Internal_Rela * rel; | |
1001 | bfd_vma value; | |
1002 | struct bfd_link_info * info; | |
1003 | asection * sym_sec; | |
1004 | const char * sym_name; | |
1005 | unsigned char sym_flags; | |
780a67af | 1006 | struct elf_link_hash_entry * h; |
252b5132 RH |
1007 | { |
1008 | unsigned long r_type = howto->type; | |
1009 | unsigned long r_symndx; | |
1010 | bfd_byte * hit_data = contents + rel->r_offset; | |
1011 | bfd * dynobj = NULL; | |
1012 | Elf_Internal_Shdr * symtab_hdr; | |
1013 | struct elf_link_hash_entry ** sym_hashes; | |
1014 | bfd_vma * local_got_offsets; | |
1015 | asection * sgot = NULL; | |
1016 | asection * splt = NULL; | |
1017 | asection * sreloc = NULL; | |
252b5132 | 1018 | bfd_vma addend; |
ba96a88f NC |
1019 | bfd_signed_vma signed_addend; |
1020 | struct elf32_arm_link_hash_table * globals; | |
f21f3fe0 | 1021 | |
ba96a88f | 1022 | globals = elf32_arm_hash_table (info); |
f21f3fe0 | 1023 | |
252b5132 RH |
1024 | dynobj = elf_hash_table (info)->dynobj; |
1025 | if (dynobj) | |
1026 | { | |
1027 | sgot = bfd_get_section_by_name (dynobj, ".got"); | |
1028 | splt = bfd_get_section_by_name (dynobj, ".plt"); | |
1029 | } | |
1030 | symtab_hdr = & elf_tdata (input_bfd)->symtab_hdr; | |
1031 | sym_hashes = elf_sym_hashes (input_bfd); | |
1032 | local_got_offsets = elf_local_got_offsets (input_bfd); | |
1033 | r_symndx = ELF32_R_SYM (rel->r_info); | |
1034 | ||
1035 | #ifdef USE_REL | |
ba96a88f NC |
1036 | addend = bfd_get_32 (input_bfd, hit_data) & howto->src_mask; |
1037 | ||
1038 | if (addend & ((howto->src_mask + 1) >> 1)) | |
1039 | { | |
1040 | signed_addend = -1; | |
1041 | signed_addend &= ~ howto->src_mask; | |
1042 | signed_addend |= addend; | |
1043 | } | |
1044 | else | |
1045 | signed_addend = addend; | |
252b5132 | 1046 | #else |
ba96a88f | 1047 | addend = signed_addend = rel->r_addend; |
252b5132 | 1048 | #endif |
f21f3fe0 | 1049 | |
252b5132 RH |
1050 | switch (r_type) |
1051 | { | |
1052 | case R_ARM_NONE: | |
1053 | return bfd_reloc_ok; | |
1054 | ||
1055 | case R_ARM_PC24: | |
1056 | case R_ARM_ABS32: | |
1057 | case R_ARM_REL32: | |
dfc5f959 NC |
1058 | #ifndef OLD_ARM_ABI |
1059 | case R_ARM_XPC25: | |
1060 | #endif | |
252b5132 | 1061 | /* When generating a shared object, these relocations are copied |
9b485d32 | 1062 | into the output file to be resolved at run time. */ |
252b5132 RH |
1063 | if (info->shared |
1064 | && (r_type != R_ARM_PC24 | |
1065 | || (h != NULL | |
1066 | && h->dynindx != -1 | |
1067 | && (! info->symbolic | |
1068 | || (h->elf_link_hash_flags | |
1069 | & ELF_LINK_HASH_DEF_REGULAR) == 0)))) | |
1070 | { | |
1071 | Elf_Internal_Rel outrel; | |
1072 | boolean skip, relocate; | |
f21f3fe0 | 1073 | |
252b5132 RH |
1074 | if (sreloc == NULL) |
1075 | { | |
1076 | const char * name; | |
f21f3fe0 | 1077 | |
252b5132 RH |
1078 | name = (bfd_elf_string_from_elf_section |
1079 | (input_bfd, | |
1080 | elf_elfheader (input_bfd)->e_shstrndx, | |
1081 | elf_section_data (input_section)->rel_hdr.sh_name)); | |
1082 | if (name == NULL) | |
1083 | return bfd_reloc_notsupported; | |
f21f3fe0 | 1084 | |
252b5132 RH |
1085 | BFD_ASSERT (strncmp (name, ".rel", 4) == 0 |
1086 | && strcmp (bfd_get_section_name (input_bfd, | |
1087 | input_section), | |
1088 | name + 4) == 0); | |
f21f3fe0 | 1089 | |
252b5132 RH |
1090 | sreloc = bfd_get_section_by_name (dynobj, name); |
1091 | BFD_ASSERT (sreloc != NULL); | |
1092 | } | |
f21f3fe0 | 1093 | |
252b5132 | 1094 | skip = false; |
f21f3fe0 | 1095 | |
252b5132 RH |
1096 | if (elf_section_data (input_section)->stab_info == NULL) |
1097 | outrel.r_offset = rel->r_offset; | |
1098 | else | |
1099 | { | |
1100 | bfd_vma off; | |
f21f3fe0 | 1101 | |
252b5132 RH |
1102 | off = (_bfd_stab_section_offset |
1103 | (output_bfd, &elf_hash_table (info)->stab_info, | |
1104 | input_section, | |
1105 | & elf_section_data (input_section)->stab_info, | |
1106 | rel->r_offset)); | |
1107 | if (off == (bfd_vma) -1) | |
1108 | skip = true; | |
1109 | outrel.r_offset = off; | |
1110 | } | |
f21f3fe0 | 1111 | |
252b5132 RH |
1112 | outrel.r_offset += (input_section->output_section->vma |
1113 | + input_section->output_offset); | |
f21f3fe0 | 1114 | |
252b5132 RH |
1115 | if (skip) |
1116 | { | |
1117 | memset (&outrel, 0, sizeof outrel); | |
1118 | relocate = false; | |
1119 | } | |
1120 | else if (r_type == R_ARM_PC24) | |
1121 | { | |
1122 | BFD_ASSERT (h != NULL && h->dynindx != -1); | |
1123 | if ((input_section->flags & SEC_ALLOC) != 0) | |
1124 | relocate = false; | |
1125 | else | |
1126 | relocate = true; | |
1127 | outrel.r_info = ELF32_R_INFO (h->dynindx, R_ARM_PC24); | |
1128 | } | |
1129 | else | |
1130 | { | |
1131 | if (h == NULL | |
1132 | || ((info->symbolic || h->dynindx == -1) | |
1133 | && (h->elf_link_hash_flags | |
1134 | & ELF_LINK_HASH_DEF_REGULAR) != 0)) | |
1135 | { | |
1136 | relocate = true; | |
1137 | outrel.r_info = ELF32_R_INFO (0, R_ARM_RELATIVE); | |
1138 | } | |
1139 | else | |
1140 | { | |
1141 | BFD_ASSERT (h->dynindx != -1); | |
1142 | if ((input_section->flags & SEC_ALLOC) != 0) | |
1143 | relocate = false; | |
1144 | else | |
1145 | relocate = true; | |
1146 | outrel.r_info = ELF32_R_INFO (h->dynindx, R_ARM_ABS32); | |
1147 | } | |
1148 | } | |
f21f3fe0 | 1149 | |
252b5132 RH |
1150 | bfd_elf32_swap_reloc_out (output_bfd, &outrel, |
1151 | (((Elf32_External_Rel *) | |
1152 | sreloc->contents) | |
1153 | + sreloc->reloc_count)); | |
1154 | ++sreloc->reloc_count; | |
9a5aca8c | 1155 | |
f21f3fe0 | 1156 | /* If this reloc is against an external symbol, we do not want to |
252b5132 | 1157 | fiddle with the addend. Otherwise, we need to include the symbol |
9b485d32 | 1158 | value so that it becomes an addend for the dynamic reloc. */ |
252b5132 RH |
1159 | if (! relocate) |
1160 | return bfd_reloc_ok; | |
9a5aca8c | 1161 | |
f21f3fe0 | 1162 | return _bfd_final_link_relocate (howto, input_bfd, input_section, |
252b5132 RH |
1163 | contents, rel->r_offset, value, |
1164 | (bfd_vma) 0); | |
1165 | } | |
1166 | else switch (r_type) | |
1167 | { | |
dfc5f959 NC |
1168 | #ifndef OLD_ARM_ABI |
1169 | case R_ARM_XPC25: /* Arm BLX instruction. */ | |
1170 | #endif | |
1171 | case R_ARM_PC24: /* Arm B/BL instruction */ | |
1172 | #ifndef OLD_ARM_ABI | |
1173 | if (r_type == R_ARM_XPC25) | |
252b5132 | 1174 | { |
dfc5f959 NC |
1175 | /* Check for Arm calling Arm function. */ |
1176 | /* FIXME: Should we translate the instruction into a BL | |
1177 | instruction instead ? */ | |
1178 | if (sym_flags != STT_ARM_TFUNC) | |
1179 | _bfd_error_handler (_("\ | |
1180 | %s: Warning: Arm BLX instruction targets Arm function '%s'."), | |
1181 | bfd_get_filename (input_bfd), | |
b1bcb49f | 1182 | h ? h->root.root.string : "(local)"); |
dfc5f959 NC |
1183 | } |
1184 | else | |
1185 | #endif | |
1186 | { | |
1187 | /* Check for Arm calling Thumb function. */ | |
1188 | if (sym_flags == STT_ARM_TFUNC) | |
1189 | { | |
1190 | elf32_arm_to_thumb_stub (info, sym_name, input_bfd, output_bfd, | |
1191 | input_section, hit_data, sym_sec, rel->r_offset, | |
1192 | signed_addend, value); | |
1193 | return bfd_reloc_ok; | |
1194 | } | |
252b5132 | 1195 | } |
ba96a88f NC |
1196 | |
1197 | if ( strcmp (bfd_get_target (input_bfd), "elf32-littlearm-oabi") == 0 | |
1198 | || strcmp (bfd_get_target (input_bfd), "elf32-bigarm-oabi") == 0) | |
1199 | { | |
1200 | /* The old way of doing things. Trearing the addend as a | |
1201 | byte sized field and adding in the pipeline offset. */ | |
ba96a88f NC |
1202 | value -= (input_section->output_section->vma |
1203 | + input_section->output_offset); | |
1204 | value -= rel->r_offset; | |
1205 | value += addend; | |
f21f3fe0 | 1206 | |
ba96a88f NC |
1207 | if (! globals->no_pipeline_knowledge) |
1208 | value -= 8; | |
1209 | } | |
1210 | else | |
1211 | { | |
1212 | /* The ARM ELF ABI says that this reloc is computed as: S - P + A | |
1213 | where: | |
1214 | S is the address of the symbol in the relocation. | |
1215 | P is address of the instruction being relocated. | |
1216 | A is the addend (extracted from the instruction) in bytes. | |
f21f3fe0 | 1217 | |
ba96a88f NC |
1218 | S is held in 'value'. |
1219 | P is the base address of the section containing the instruction | |
1220 | plus the offset of the reloc into that section, ie: | |
1221 | (input_section->output_section->vma + | |
1222 | input_section->output_offset + | |
1223 | rel->r_offset). | |
1224 | A is the addend, converted into bytes, ie: | |
1225 | (signed_addend * 4) | |
1226 | ||
1227 | Note: None of these operations have knowledge of the pipeline | |
1228 | size of the processor, thus it is up to the assembler to encode | |
1229 | this information into the addend. */ | |
ba96a88f NC |
1230 | value -= (input_section->output_section->vma |
1231 | + input_section->output_offset); | |
1232 | value -= rel->r_offset; | |
1233 | value += (signed_addend << howto->size); | |
f21f3fe0 | 1234 | |
ba96a88f NC |
1235 | /* Previous versions of this code also used to add in the pipeline |
1236 | offset here. This is wrong because the linker is not supposed | |
1237 | to know about such things, and one day it might change. In order | |
1238 | to support old binaries that need the old behaviour however, so | |
1239 | we attempt to detect which ABI was used to create the reloc. */ | |
1240 | if (! globals->no_pipeline_knowledge) | |
f21f3fe0 | 1241 | { |
ba96a88f | 1242 | Elf_Internal_Ehdr * i_ehdrp; /* Elf file header, internal form */ |
f21f3fe0 | 1243 | |
ba96a88f | 1244 | i_ehdrp = elf_elfheader (input_bfd); |
f21f3fe0 | 1245 | |
ba96a88f NC |
1246 | if (i_ehdrp->e_ident[EI_OSABI] == 0) |
1247 | value -= 8; | |
1248 | } | |
1249 | } | |
23080146 | 1250 | |
dcb5e6e6 NC |
1251 | signed_addend = value; |
1252 | signed_addend >>= howto->rightshift; | |
9a5aca8c | 1253 | |
59f2c4e7 NC |
1254 | /* It is not an error for an undefined weak reference to be |
1255 | out of range. Any program that branches to such a symbol | |
9a5aca8c AM |
1256 | is going to crash anyway, so there is no point worrying |
1257 | about getting the destination exactly right. */ | |
59f2c4e7 NC |
1258 | if (! h || h->root.type != bfd_link_hash_undefweak) |
1259 | { | |
9b485d32 | 1260 | /* Perform a signed range check. */ |
dcb5e6e6 | 1261 | if ( signed_addend > ((bfd_signed_vma) (howto->dst_mask >> 1)) |
59f2c4e7 NC |
1262 | || signed_addend < - ((bfd_signed_vma) ((howto->dst_mask + 1) >> 1))) |
1263 | return bfd_reloc_overflow; | |
1264 | } | |
9a5aca8c | 1265 | |
dcb5e6e6 NC |
1266 | #ifndef OLD_ARM_ABI |
1267 | /* If necessary set the H bit in the BLX instruction. */ | |
1268 | if (r_type == R_ARM_XPC25 && ((value & 2) == 2)) | |
1269 | value = (signed_addend & howto->dst_mask) | |
1270 | | (bfd_get_32 (input_bfd, hit_data) & (~ howto->dst_mask)) | |
1271 | | (1 << 24); | |
1272 | else | |
1273 | #endif | |
1274 | value = (signed_addend & howto->dst_mask) | |
1275 | | (bfd_get_32 (input_bfd, hit_data) & (~ howto->dst_mask)); | |
252b5132 | 1276 | break; |
f21f3fe0 | 1277 | |
252b5132 RH |
1278 | case R_ARM_ABS32: |
1279 | value += addend; | |
1280 | if (sym_flags == STT_ARM_TFUNC) | |
1281 | value |= 1; | |
1282 | break; | |
f21f3fe0 | 1283 | |
252b5132 RH |
1284 | case R_ARM_REL32: |
1285 | value -= (input_section->output_section->vma | |
1286 | + input_section->output_offset); | |
1287 | value += addend; | |
1288 | break; | |
1289 | } | |
f21f3fe0 | 1290 | |
252b5132 RH |
1291 | bfd_put_32 (input_bfd, value, hit_data); |
1292 | return bfd_reloc_ok; | |
1293 | ||
1294 | case R_ARM_ABS8: | |
1295 | value += addend; | |
1296 | if ((long) value > 0x7f || (long) value < -0x80) | |
1297 | return bfd_reloc_overflow; | |
1298 | ||
1299 | bfd_put_8 (input_bfd, value, hit_data); | |
1300 | return bfd_reloc_ok; | |
1301 | ||
1302 | case R_ARM_ABS16: | |
1303 | value += addend; | |
1304 | ||
1305 | if ((long) value > 0x7fff || (long) value < -0x8000) | |
1306 | return bfd_reloc_overflow; | |
1307 | ||
1308 | bfd_put_16 (input_bfd, value, hit_data); | |
1309 | return bfd_reloc_ok; | |
1310 | ||
1311 | case R_ARM_ABS12: | |
1312 | /* Support ldr and str instruction for the arm */ | |
1313 | /* Also thumb b (unconditional branch). ??? Really? */ | |
1314 | value += addend; | |
1315 | ||
1316 | if ((long) value > 0x7ff || (long) value < -0x800) | |
1317 | return bfd_reloc_overflow; | |
1318 | ||
1319 | value |= (bfd_get_32 (input_bfd, hit_data) & 0xfffff000); | |
1320 | bfd_put_32 (input_bfd, value, hit_data); | |
1321 | return bfd_reloc_ok; | |
1322 | ||
1323 | case R_ARM_THM_ABS5: | |
9b485d32 | 1324 | /* Support ldr and str instructions for the thumb. */ |
252b5132 RH |
1325 | #ifdef USE_REL |
1326 | /* Need to refetch addend. */ | |
1327 | addend = bfd_get_16 (input_bfd, hit_data) & howto->src_mask; | |
1328 | /* ??? Need to determine shift amount from operand size. */ | |
1329 | addend >>= howto->rightshift; | |
1330 | #endif | |
1331 | value += addend; | |
1332 | ||
1333 | /* ??? Isn't value unsigned? */ | |
1334 | if ((long) value > 0x1f || (long) value < -0x10) | |
1335 | return bfd_reloc_overflow; | |
1336 | ||
1337 | /* ??? Value needs to be properly shifted into place first. */ | |
1338 | value |= bfd_get_16 (input_bfd, hit_data) & 0xf83f; | |
1339 | bfd_put_16 (input_bfd, value, hit_data); | |
1340 | return bfd_reloc_ok; | |
1341 | ||
dfc5f959 NC |
1342 | #ifndef OLD_ARM_ABI |
1343 | case R_ARM_THM_XPC22: | |
1344 | #endif | |
252b5132 | 1345 | case R_ARM_THM_PC22: |
dfc5f959 | 1346 | /* Thumb BL (branch long instruction). */ |
252b5132 | 1347 | { |
ba96a88f NC |
1348 | bfd_vma relocation; |
1349 | boolean overflow = false; | |
1350 | bfd_vma upper_insn = bfd_get_16 (input_bfd, hit_data); | |
1351 | bfd_vma lower_insn = bfd_get_16 (input_bfd, hit_data + 2); | |
252b5132 | 1352 | bfd_signed_vma reloc_signed_max = (1 << (howto->bitsize - 1)) - 1; |
ba96a88f NC |
1353 | bfd_signed_vma reloc_signed_min = ~ reloc_signed_max; |
1354 | bfd_vma check; | |
252b5132 | 1355 | bfd_signed_vma signed_check; |
252b5132 RH |
1356 | |
1357 | #ifdef USE_REL | |
1358 | /* Need to refetch the addend and squish the two 11 bit pieces | |
1359 | together. */ | |
1360 | { | |
ba96a88f NC |
1361 | bfd_vma upper = upper_insn & 0x7ff; |
1362 | bfd_vma lower = lower_insn & 0x7ff; | |
9b485d32 | 1363 | upper = (upper ^ 0x400) - 0x400; /* Sign extend. */ |
252b5132 | 1364 | addend = (upper << 12) | (lower << 1); |
ba96a88f | 1365 | signed_addend = addend; |
252b5132 RH |
1366 | } |
1367 | #endif | |
dfc5f959 NC |
1368 | #ifndef OLD_ARM_ABI |
1369 | if (r_type == R_ARM_THM_XPC22) | |
1370 | { | |
1371 | /* Check for Thumb to Thumb call. */ | |
1372 | /* FIXME: Should we translate the instruction into a BL | |
1373 | instruction instead ? */ | |
1374 | if (sym_flags == STT_ARM_TFUNC) | |
1375 | _bfd_error_handler (_("\ | |
1376 | %s: Warning: Thumb BLX instruction targets thumb function '%s'."), | |
1377 | bfd_get_filename (input_bfd), | |
b1bcb49f | 1378 | h ? h->root.root.string : "(local)"); |
dfc5f959 NC |
1379 | } |
1380 | else | |
1381 | #endif | |
252b5132 | 1382 | { |
dfc5f959 NC |
1383 | /* If it is not a call to Thumb, assume call to Arm. |
1384 | If it is a call relative to a section name, then it is not a | |
1385 | function call at all, but rather a long jump. */ | |
1386 | if (sym_flags != STT_ARM_TFUNC && sym_flags != STT_SECTION) | |
1387 | { | |
1388 | if (elf32_thumb_to_arm_stub | |
1389 | (info, sym_name, input_bfd, output_bfd, input_section, | |
1390 | hit_data, sym_sec, rel->r_offset, signed_addend, value)) | |
1391 | return bfd_reloc_ok; | |
1392 | else | |
1393 | return bfd_reloc_dangerous; | |
1394 | } | |
252b5132 | 1395 | } |
f21f3fe0 | 1396 | |
ba96a88f | 1397 | relocation = value + signed_addend; |
f21f3fe0 | 1398 | |
252b5132 | 1399 | relocation -= (input_section->output_section->vma |
ba96a88f NC |
1400 | + input_section->output_offset |
1401 | + rel->r_offset); | |
9a5aca8c | 1402 | |
ba96a88f NC |
1403 | if (! globals->no_pipeline_knowledge) |
1404 | { | |
9b485d32 | 1405 | Elf_Internal_Ehdr * i_ehdrp; /* Elf file header, internal form. */ |
9a5aca8c | 1406 | |
ba96a88f | 1407 | i_ehdrp = elf_elfheader (input_bfd); |
f21f3fe0 | 1408 | |
ba96a88f NC |
1409 | /* Previous versions of this code also used to add in the pipline |
1410 | offset here. This is wrong because the linker is not supposed | |
1411 | to know about such things, and one day it might change. In order | |
1412 | to support old binaries that need the old behaviour however, so | |
1413 | we attempt to detect which ABI was used to create the reloc. */ | |
1414 | if ( strcmp (bfd_get_target (input_bfd), "elf32-littlearm-oabi") == 0 | |
1415 | || strcmp (bfd_get_target (input_bfd), "elf32-bigarm-oabi") == 0 | |
1416 | || i_ehdrp->e_ident[EI_OSABI] == 0) | |
1417 | relocation += 4; | |
1418 | } | |
f21f3fe0 | 1419 | |
252b5132 RH |
1420 | check = relocation >> howto->rightshift; |
1421 | ||
1422 | /* If this is a signed value, the rightshift just dropped | |
1423 | leading 1 bits (assuming twos complement). */ | |
1424 | if ((bfd_signed_vma) relocation >= 0) | |
1425 | signed_check = check; | |
1426 | else | |
1427 | signed_check = check | ~((bfd_vma) -1 >> howto->rightshift); | |
1428 | ||
252b5132 | 1429 | /* Assumes two's complement. */ |
ba96a88f | 1430 | if (signed_check > reloc_signed_max || signed_check < reloc_signed_min) |
252b5132 RH |
1431 | overflow = true; |
1432 | ||
1433 | /* Put RELOCATION back into the insn. */ | |
1434 | upper_insn = (upper_insn & ~(bfd_vma) 0x7ff) | ((relocation >> 12) & 0x7ff); | |
1435 | lower_insn = (lower_insn & ~(bfd_vma) 0x7ff) | ((relocation >> 1) & 0x7ff); | |
1436 | ||
1437 | /* Put the relocated value back in the object file: */ | |
1438 | bfd_put_16 (input_bfd, upper_insn, hit_data); | |
1439 | bfd_put_16 (input_bfd, lower_insn, hit_data + 2); | |
1440 | ||
1441 | return (overflow ? bfd_reloc_overflow : bfd_reloc_ok); | |
1442 | } | |
1443 | break; | |
1444 | ||
1445 | case R_ARM_GNU_VTINHERIT: | |
1446 | case R_ARM_GNU_VTENTRY: | |
1447 | return bfd_reloc_ok; | |
1448 | ||
1449 | case R_ARM_COPY: | |
1450 | return bfd_reloc_notsupported; | |
1451 | ||
1452 | case R_ARM_GLOB_DAT: | |
1453 | return bfd_reloc_notsupported; | |
1454 | ||
1455 | case R_ARM_JUMP_SLOT: | |
1456 | return bfd_reloc_notsupported; | |
1457 | ||
1458 | case R_ARM_RELATIVE: | |
1459 | return bfd_reloc_notsupported; | |
1460 | ||
1461 | case R_ARM_GOTOFF: | |
1462 | /* Relocation is relative to the start of the | |
1463 | global offset table. */ | |
1464 | ||
1465 | BFD_ASSERT (sgot != NULL); | |
1466 | if (sgot == NULL) | |
1467 | return bfd_reloc_notsupported; | |
9a5aca8c | 1468 | |
252b5132 RH |
1469 | /* Note that sgot->output_offset is not involved in this |
1470 | calculation. We always want the start of .got. If we | |
1471 | define _GLOBAL_OFFSET_TABLE in a different way, as is | |
1472 | permitted by the ABI, we might have to change this | |
9b485d32 | 1473 | calculation. */ |
252b5132 | 1474 | value -= sgot->output_section->vma; |
f21f3fe0 | 1475 | return _bfd_final_link_relocate (howto, input_bfd, input_section, |
252b5132 RH |
1476 | contents, rel->r_offset, value, |
1477 | (bfd_vma) 0); | |
1478 | ||
1479 | case R_ARM_GOTPC: | |
a7c10850 | 1480 | /* Use global offset table as symbol value. */ |
252b5132 | 1481 | BFD_ASSERT (sgot != NULL); |
f21f3fe0 | 1482 | |
252b5132 RH |
1483 | if (sgot == NULL) |
1484 | return bfd_reloc_notsupported; | |
1485 | ||
1486 | value = sgot->output_section->vma; | |
f21f3fe0 | 1487 | return _bfd_final_link_relocate (howto, input_bfd, input_section, |
252b5132 RH |
1488 | contents, rel->r_offset, value, |
1489 | (bfd_vma) 0); | |
f21f3fe0 | 1490 | |
252b5132 RH |
1491 | case R_ARM_GOT32: |
1492 | /* Relocation is to the entry for this symbol in the | |
9b485d32 | 1493 | global offset table. */ |
252b5132 RH |
1494 | if (sgot == NULL) |
1495 | return bfd_reloc_notsupported; | |
f21f3fe0 | 1496 | |
252b5132 RH |
1497 | if (h != NULL) |
1498 | { | |
1499 | bfd_vma off; | |
f21f3fe0 | 1500 | |
252b5132 RH |
1501 | off = h->got.offset; |
1502 | BFD_ASSERT (off != (bfd_vma) -1); | |
f21f3fe0 | 1503 | |
252b5132 RH |
1504 | if (!elf_hash_table (info)->dynamic_sections_created || |
1505 | (info->shared && (info->symbolic || h->dynindx == -1) | |
1506 | && (h->elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR))) | |
1507 | { | |
1508 | /* This is actually a static link, or it is a -Bsymbolic link | |
1509 | and the symbol is defined locally. We must initialize this | |
1510 | entry in the global offset table. Since the offset must | |
1511 | always be a multiple of 4, we use the least significant bit | |
1512 | to record whether we have initialized it already. | |
f21f3fe0 | 1513 | |
252b5132 | 1514 | When doing a dynamic link, we create a .rel.got relocation |
f21f3fe0 | 1515 | entry to initialize the value. This is done in the |
9b485d32 | 1516 | finish_dynamic_symbol routine. */ |
252b5132 RH |
1517 | if ((off & 1) != 0) |
1518 | off &= ~1; | |
1519 | else | |
1520 | { | |
1521 | bfd_put_32 (output_bfd, value, sgot->contents + off); | |
1522 | h->got.offset |= 1; | |
1523 | } | |
1524 | } | |
f21f3fe0 | 1525 | |
252b5132 RH |
1526 | value = sgot->output_offset + off; |
1527 | } | |
1528 | else | |
1529 | { | |
1530 | bfd_vma off; | |
f21f3fe0 | 1531 | |
252b5132 RH |
1532 | BFD_ASSERT (local_got_offsets != NULL && |
1533 | local_got_offsets[r_symndx] != (bfd_vma) -1); | |
f21f3fe0 | 1534 | |
252b5132 | 1535 | off = local_got_offsets[r_symndx]; |
f21f3fe0 | 1536 | |
252b5132 RH |
1537 | /* The offset must always be a multiple of 4. We use the |
1538 | least significant bit to record whether we have already | |
9b485d32 | 1539 | generated the necessary reloc. */ |
252b5132 RH |
1540 | if ((off & 1) != 0) |
1541 | off &= ~1; | |
1542 | else | |
1543 | { | |
1544 | bfd_put_32 (output_bfd, value, sgot->contents + off); | |
f21f3fe0 | 1545 | |
252b5132 RH |
1546 | if (info->shared) |
1547 | { | |
1548 | asection * srelgot; | |
1549 | Elf_Internal_Rel outrel; | |
f21f3fe0 | 1550 | |
252b5132 RH |
1551 | srelgot = bfd_get_section_by_name (dynobj, ".rel.got"); |
1552 | BFD_ASSERT (srelgot != NULL); | |
f21f3fe0 | 1553 | |
252b5132 | 1554 | outrel.r_offset = (sgot->output_section->vma |
f21f3fe0 | 1555 | + sgot->output_offset |
252b5132 RH |
1556 | + off); |
1557 | outrel.r_info = ELF32_R_INFO (0, R_ARM_RELATIVE); | |
1558 | bfd_elf32_swap_reloc_out (output_bfd, &outrel, | |
1559 | (((Elf32_External_Rel *) | |
1560 | srelgot->contents) | |
1561 | + srelgot->reloc_count)); | |
1562 | ++srelgot->reloc_count; | |
1563 | } | |
f21f3fe0 | 1564 | |
252b5132 RH |
1565 | local_got_offsets[r_symndx] |= 1; |
1566 | } | |
f21f3fe0 | 1567 | |
252b5132 RH |
1568 | value = sgot->output_offset + off; |
1569 | } | |
9a5aca8c | 1570 | |
f21f3fe0 | 1571 | return _bfd_final_link_relocate (howto, input_bfd, input_section, |
252b5132 RH |
1572 | contents, rel->r_offset, value, |
1573 | (bfd_vma) 0); | |
f21f3fe0 | 1574 | |
252b5132 RH |
1575 | case R_ARM_PLT32: |
1576 | /* Relocation is to the entry for this symbol in the | |
1577 | procedure linkage table. */ | |
1578 | ||
1579 | /* Resolve a PLT32 reloc against a local symbol directly, | |
9b485d32 | 1580 | without using the procedure linkage table. */ |
252b5132 RH |
1581 | if (h == NULL) |
1582 | return _bfd_final_link_relocate (howto, input_bfd, input_section, | |
1583 | contents, rel->r_offset, value, | |
1584 | (bfd_vma) 0); | |
1585 | ||
1586 | if (h->plt.offset == (bfd_vma) -1) | |
1587 | /* We didn't make a PLT entry for this symbol. This | |
1588 | happens when statically linking PIC code, or when | |
1589 | using -Bsymbolic. */ | |
1590 | return _bfd_final_link_relocate (howto, input_bfd, input_section, | |
1591 | contents, rel->r_offset, value, | |
1592 | (bfd_vma) 0); | |
1593 | ||
1594 | BFD_ASSERT(splt != NULL); | |
1595 | if (splt == NULL) | |
1596 | return bfd_reloc_notsupported; | |
1597 | ||
1598 | value = (splt->output_section->vma | |
1599 | + splt->output_offset | |
1600 | + h->plt.offset); | |
1601 | return _bfd_final_link_relocate (howto, input_bfd, input_section, | |
1602 | contents, rel->r_offset, value, | |
1603 | (bfd_vma) 0); | |
f21f3fe0 | 1604 | |
252b5132 RH |
1605 | case R_ARM_SBREL32: |
1606 | return bfd_reloc_notsupported; | |
1607 | ||
1608 | case R_ARM_AMP_VCALL9: | |
1609 | return bfd_reloc_notsupported; | |
1610 | ||
1611 | case R_ARM_RSBREL32: | |
1612 | return bfd_reloc_notsupported; | |
1613 | ||
1614 | case R_ARM_THM_RPC22: | |
1615 | return bfd_reloc_notsupported; | |
1616 | ||
1617 | case R_ARM_RREL32: | |
1618 | return bfd_reloc_notsupported; | |
1619 | ||
1620 | case R_ARM_RABS32: | |
1621 | return bfd_reloc_notsupported; | |
1622 | ||
1623 | case R_ARM_RPC24: | |
1624 | return bfd_reloc_notsupported; | |
1625 | ||
1626 | case R_ARM_RBASE: | |
1627 | return bfd_reloc_notsupported; | |
1628 | ||
1629 | default: | |
1630 | return bfd_reloc_notsupported; | |
1631 | } | |
1632 | } | |
1633 | ||
98c1d4aa NC |
1634 | #ifdef USE_REL |
1635 | /* Add INCREMENT to the reloc (of type HOWTO) at ADDRESS. */ | |
1636 | static void | |
1637 | arm_add_to_rel (abfd, address, howto, increment) | |
1638 | bfd * abfd; | |
59f2c4e7 | 1639 | bfd_byte * address; |
98c1d4aa NC |
1640 | reloc_howto_type * howto; |
1641 | bfd_signed_vma increment; | |
1642 | { | |
98c1d4aa NC |
1643 | bfd_signed_vma addend; |
1644 | ||
9a5aca8c | 1645 | if (howto->type == R_ARM_THM_PC22) |
98c1d4aa | 1646 | { |
9a5aca8c AM |
1647 | int upper_insn, lower_insn; |
1648 | int upper, lower; | |
98c1d4aa | 1649 | |
9a5aca8c AM |
1650 | upper_insn = bfd_get_16 (abfd, address); |
1651 | lower_insn = bfd_get_16 (abfd, address + 2); | |
1652 | upper = upper_insn & 0x7ff; | |
1653 | lower = lower_insn & 0x7ff; | |
1654 | ||
1655 | addend = (upper << 12) | (lower << 1); | |
ddda4409 | 1656 | addend += increment; |
9a5aca8c | 1657 | addend >>= 1; |
98c1d4aa | 1658 | |
9a5aca8c AM |
1659 | upper_insn = (upper_insn & 0xf800) | ((addend >> 11) & 0x7ff); |
1660 | lower_insn = (lower_insn & 0xf800) | (addend & 0x7ff); | |
1661 | ||
1662 | bfd_put_16 (abfd, upper_insn, address); | |
1663 | bfd_put_16 (abfd, lower_insn, address + 2); | |
1664 | } | |
1665 | else | |
1666 | { | |
1667 | bfd_vma contents; | |
1668 | ||
1669 | contents = bfd_get_32 (abfd, address); | |
1670 | ||
1671 | /* Get the (signed) value from the instruction. */ | |
1672 | addend = contents & howto->src_mask; | |
1673 | if (addend & ((howto->src_mask + 1) >> 1)) | |
1674 | { | |
1675 | bfd_signed_vma mask; | |
1676 | ||
1677 | mask = -1; | |
1678 | mask &= ~ howto->src_mask; | |
1679 | addend |= mask; | |
1680 | } | |
1681 | ||
1682 | /* Add in the increment, (which is a byte value). */ | |
1683 | switch (howto->type) | |
1684 | { | |
1685 | default: | |
1686 | addend += increment; | |
1687 | break; | |
1688 | ||
1689 | case R_ARM_PC24: | |
1690 | addend <<= howto->size; | |
1691 | addend += increment; | |
1692 | ||
1693 | /* Should we check for overflow here ? */ | |
1694 | ||
1695 | /* Drop any undesired bits. */ | |
1696 | addend >>= howto->rightshift; | |
1697 | break; | |
1698 | } | |
1699 | ||
1700 | contents = (contents & ~ howto->dst_mask) | (addend & howto->dst_mask); | |
1701 | ||
1702 | bfd_put_32 (abfd, contents, address); | |
ddda4409 | 1703 | } |
98c1d4aa NC |
1704 | } |
1705 | #endif /* USE_REL */ | |
252b5132 RH |
1706 | |
1707 | /* Relocate an ARM ELF section. */ | |
1708 | static boolean | |
1709 | elf32_arm_relocate_section (output_bfd, info, input_bfd, input_section, | |
1710 | contents, relocs, local_syms, local_sections) | |
1711 | bfd * output_bfd; | |
1712 | struct bfd_link_info * info; | |
1713 | bfd * input_bfd; | |
1714 | asection * input_section; | |
1715 | bfd_byte * contents; | |
1716 | Elf_Internal_Rela * relocs; | |
1717 | Elf_Internal_Sym * local_syms; | |
1718 | asection ** local_sections; | |
1719 | { | |
1720 | Elf_Internal_Shdr * symtab_hdr; | |
1721 | struct elf_link_hash_entry ** sym_hashes; | |
1722 | Elf_Internal_Rela * rel; | |
1723 | Elf_Internal_Rela * relend; | |
1724 | const char * name; | |
1725 | ||
1726 | symtab_hdr = & elf_tdata (input_bfd)->symtab_hdr; | |
1727 | sym_hashes = elf_sym_hashes (input_bfd); | |
1728 | ||
1729 | rel = relocs; | |
1730 | relend = relocs + input_section->reloc_count; | |
1731 | for (; rel < relend; rel++) | |
1732 | { | |
ba96a88f NC |
1733 | int r_type; |
1734 | reloc_howto_type * howto; | |
1735 | unsigned long r_symndx; | |
1736 | Elf_Internal_Sym * sym; | |
1737 | asection * sec; | |
252b5132 | 1738 | struct elf_link_hash_entry * h; |
ba96a88f NC |
1739 | bfd_vma relocation; |
1740 | bfd_reloc_status_type r; | |
1741 | arelent bfd_reloc; | |
f21f3fe0 | 1742 | |
252b5132 | 1743 | r_symndx = ELF32_R_SYM (rel->r_info); |
ba96a88f | 1744 | r_type = ELF32_R_TYPE (rel->r_info); |
252b5132 | 1745 | |
ba96a88f NC |
1746 | if ( r_type == R_ARM_GNU_VTENTRY |
1747 | || r_type == R_ARM_GNU_VTINHERIT) | |
252b5132 RH |
1748 | continue; |
1749 | ||
ba96a88f NC |
1750 | elf32_arm_info_to_howto (input_bfd, & bfd_reloc, rel); |
1751 | howto = bfd_reloc.howto; | |
252b5132 RH |
1752 | |
1753 | if (info->relocateable) | |
1754 | { | |
1755 | /* This is a relocateable link. We don't have to change | |
1756 | anything, unless the reloc is against a section symbol, | |
1757 | in which case we have to adjust according to where the | |
1758 | section symbol winds up in the output section. */ | |
1759 | if (r_symndx < symtab_hdr->sh_info) | |
1760 | { | |
1761 | sym = local_syms + r_symndx; | |
1762 | if (ELF_ST_TYPE (sym->st_info) == STT_SECTION) | |
1763 | { | |
1764 | sec = local_sections[r_symndx]; | |
1765 | #ifdef USE_REL | |
98c1d4aa NC |
1766 | arm_add_to_rel (input_bfd, contents + rel->r_offset, |
1767 | howto, sec->output_offset + sym->st_value); | |
252b5132 RH |
1768 | #else |
1769 | rel->r_addend += (sec->output_offset + sym->st_value) | |
1770 | >> howto->rightshift; | |
1771 | #endif | |
1772 | } | |
1773 | } | |
1774 | ||
1775 | continue; | |
1776 | } | |
1777 | ||
1778 | /* This is a final link. */ | |
1779 | h = NULL; | |
1780 | sym = NULL; | |
1781 | sec = NULL; | |
9b485d32 | 1782 | |
252b5132 RH |
1783 | if (r_symndx < symtab_hdr->sh_info) |
1784 | { | |
1785 | sym = local_syms + r_symndx; | |
1786 | sec = local_sections[r_symndx]; | |
1787 | relocation = (sec->output_section->vma | |
1788 | + sec->output_offset | |
1789 | + sym->st_value); | |
1790 | } | |
1791 | else | |
1792 | { | |
1793 | h = sym_hashes[r_symndx - symtab_hdr->sh_info]; | |
9b485d32 NC |
1794 | |
1795 | while ( h->root.type == bfd_link_hash_indirect | |
252b5132 RH |
1796 | || h->root.type == bfd_link_hash_warning) |
1797 | h = (struct elf_link_hash_entry *) h->root.u.i.link; | |
9b485d32 NC |
1798 | |
1799 | if ( h->root.type == bfd_link_hash_defined | |
252b5132 RH |
1800 | || h->root.type == bfd_link_hash_defweak) |
1801 | { | |
780a67af | 1802 | int relocation_needed = 1; |
f21f3fe0 | 1803 | |
780a67af | 1804 | sec = h->root.u.def.section; |
f21f3fe0 | 1805 | |
252b5132 | 1806 | /* In these cases, we don't need the relocation value. |
f21f3fe0 | 1807 | We check specially because in some obscure cases |
9b485d32 | 1808 | sec->output_section will be NULL. */ |
252b5132 RH |
1809 | switch (r_type) |
1810 | { | |
1811 | case R_ARM_PC24: | |
1812 | case R_ARM_ABS32: | |
1813 | if (info->shared | |
1814 | && ( | |
1815 | (!info->symbolic && h->dynindx != -1) | |
97eaf9de | 1816 | || (h->elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR) == 0 |
252b5132 | 1817 | ) |
05924f36 PB |
1818 | && ((input_section->flags & SEC_ALLOC) != 0 |
1819 | /* DWARF will emit R_ARM_ABS32 relocations in its | |
1820 | sections against symbols defined externally | |
1821 | in shared libraries. We can't do anything | |
1822 | with them here. */ | |
1823 | || ((input_section->flags & SEC_DEBUGGING) != 0 | |
1824 | && (h->elf_link_hash_flags | |
1825 | & ELF_LINK_HASH_DEF_DYNAMIC) != 0)) | |
252b5132 | 1826 | ) |
780a67af | 1827 | relocation_needed = 0; |
252b5132 | 1828 | break; |
f21f3fe0 | 1829 | |
252b5132 | 1830 | case R_ARM_GOTPC: |
780a67af | 1831 | relocation_needed = 0; |
252b5132 | 1832 | break; |
f21f3fe0 | 1833 | |
252b5132 RH |
1834 | case R_ARM_GOT32: |
1835 | if (elf_hash_table(info)->dynamic_sections_created | |
1836 | && (!info->shared | |
1837 | || (!info->symbolic && h->dynindx != -1) | |
1838 | || (h->elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR) == 0 | |
1839 | ) | |
1840 | ) | |
780a67af | 1841 | relocation_needed = 0; |
252b5132 | 1842 | break; |
f21f3fe0 | 1843 | |
252b5132 RH |
1844 | case R_ARM_PLT32: |
1845 | if (h->plt.offset != (bfd_vma)-1) | |
780a67af | 1846 | relocation_needed = 0; |
252b5132 | 1847 | break; |
f21f3fe0 | 1848 | |
252b5132 RH |
1849 | default: |
1850 | if (sec->output_section == NULL) | |
1851 | { | |
1852 | (*_bfd_error_handler) | |
1853 | (_("%s: warning: unresolvable relocation against symbol `%s' from %s section"), | |
1854 | bfd_get_filename (input_bfd), h->root.root.string, | |
1855 | bfd_get_section_name (input_bfd, input_section)); | |
780a67af | 1856 | relocation_needed = 0; |
252b5132 RH |
1857 | } |
1858 | } | |
780a67af NC |
1859 | |
1860 | if (relocation_needed) | |
1861 | relocation = h->root.u.def.value | |
1862 | + sec->output_section->vma | |
1863 | + sec->output_offset; | |
1864 | else | |
1865 | relocation = 0; | |
252b5132 RH |
1866 | } |
1867 | else if (h->root.type == bfd_link_hash_undefweak) | |
1868 | relocation = 0; | |
3a27a730 L |
1869 | else if (info->shared && !info->symbolic |
1870 | && !info->no_undefined | |
1871 | && ELF_ST_VISIBILITY (h->other) == STV_DEFAULT) | |
a72747a3 | 1872 | relocation = 0; |
252b5132 RH |
1873 | else |
1874 | { | |
1875 | if (!((*info->callbacks->undefined_symbol) | |
1876 | (info, h->root.root.string, input_bfd, | |
5cc7c785 | 1877 | input_section, rel->r_offset, |
3a27a730 L |
1878 | (!info->shared || info->no_undefined |
1879 | || ELF_ST_VISIBILITY (h->other))))) | |
252b5132 RH |
1880 | return false; |
1881 | relocation = 0; | |
1882 | } | |
1883 | } | |
1884 | ||
1885 | if (h != NULL) | |
1886 | name = h->root.root.string; | |
1887 | else | |
1888 | { | |
1889 | name = (bfd_elf_string_from_elf_section | |
1890 | (input_bfd, symtab_hdr->sh_link, sym->st_name)); | |
1891 | if (name == NULL || *name == '\0') | |
1892 | name = bfd_section_name (input_bfd, sec); | |
1893 | } | |
f21f3fe0 | 1894 | |
252b5132 RH |
1895 | r = elf32_arm_final_link_relocate (howto, input_bfd, output_bfd, |
1896 | input_section, contents, rel, | |
1897 | relocation, info, sec, name, | |
1898 | (h ? ELF_ST_TYPE (h->type) : | |
780a67af | 1899 | ELF_ST_TYPE (sym->st_info)), h); |
252b5132 RH |
1900 | |
1901 | if (r != bfd_reloc_ok) | |
1902 | { | |
1903 | const char * msg = (const char *) 0; | |
1904 | ||
1905 | switch (r) | |
1906 | { | |
1907 | case bfd_reloc_overflow: | |
cf919dfd PB |
1908 | /* If the overflowing reloc was to an undefined symbol, |
1909 | we have already printed one error message and there | |
1910 | is no point complaining again. */ | |
1911 | if ((! h || | |
1912 | h->root.type != bfd_link_hash_undefined) | |
1913 | && (!((*info->callbacks->reloc_overflow) | |
1914 | (info, name, howto->name, (bfd_vma) 0, | |
1915 | input_bfd, input_section, rel->r_offset)))) | |
1916 | return false; | |
252b5132 RH |
1917 | break; |
1918 | ||
1919 | case bfd_reloc_undefined: | |
1920 | if (!((*info->callbacks->undefined_symbol) | |
1921 | (info, name, input_bfd, input_section, | |
5cc7c785 | 1922 | rel->r_offset, true))) |
252b5132 RH |
1923 | return false; |
1924 | break; | |
1925 | ||
1926 | case bfd_reloc_outofrange: | |
9b485d32 | 1927 | msg = _("internal error: out of range error"); |
252b5132 RH |
1928 | goto common_error; |
1929 | ||
1930 | case bfd_reloc_notsupported: | |
9b485d32 | 1931 | msg = _("internal error: unsupported relocation error"); |
252b5132 RH |
1932 | goto common_error; |
1933 | ||
1934 | case bfd_reloc_dangerous: | |
9b485d32 | 1935 | msg = _("internal error: dangerous error"); |
252b5132 RH |
1936 | goto common_error; |
1937 | ||
1938 | default: | |
9b485d32 | 1939 | msg = _("internal error: unknown error"); |
252b5132 RH |
1940 | /* fall through */ |
1941 | ||
1942 | common_error: | |
1943 | if (!((*info->callbacks->warning) | |
1944 | (info, msg, name, input_bfd, input_section, | |
1945 | rel->r_offset))) | |
1946 | return false; | |
1947 | break; | |
1948 | } | |
1949 | } | |
1950 | } | |
1951 | ||
1952 | return true; | |
1953 | } | |
1954 | ||
fc830a83 | 1955 | /* Function to keep ARM specific flags in the ELF header. */ |
252b5132 RH |
1956 | static boolean |
1957 | elf32_arm_set_private_flags (abfd, flags) | |
1958 | bfd *abfd; | |
1959 | flagword flags; | |
1960 | { | |
1961 | if (elf_flags_init (abfd) | |
1962 | && elf_elfheader (abfd)->e_flags != flags) | |
1963 | { | |
fc830a83 NC |
1964 | if (EF_ARM_EABI_VERSION (flags) == EF_ARM_EABI_UNKNOWN) |
1965 | { | |
1966 | if (flags & EF_INTERWORK) | |
9b485d32 | 1967 | _bfd_error_handler (_("\ |
252b5132 | 1968 | Warning: Not setting interwork flag of %s since it has already been specified as non-interworking"), |
fc830a83 NC |
1969 | bfd_get_filename (abfd)); |
1970 | else | |
9b485d32 | 1971 | _bfd_error_handler (_("\ |
252b5132 | 1972 | Warning: Clearing the interwork flag of %s due to outside request"), |
fc830a83 NC |
1973 | bfd_get_filename (abfd)); |
1974 | } | |
252b5132 RH |
1975 | } |
1976 | else | |
1977 | { | |
1978 | elf_elfheader (abfd)->e_flags = flags; | |
1979 | elf_flags_init (abfd) = true; | |
1980 | } | |
1981 | ||
1982 | return true; | |
1983 | } | |
1984 | ||
fc830a83 | 1985 | /* Copy backend specific data from one object module to another. */ |
9b485d32 | 1986 | |
252b5132 RH |
1987 | static boolean |
1988 | elf32_arm_copy_private_bfd_data (ibfd, obfd) | |
1989 | bfd *ibfd; | |
1990 | bfd *obfd; | |
1991 | { | |
1992 | flagword in_flags; | |
1993 | flagword out_flags; | |
1994 | ||
fc830a83 | 1995 | if ( bfd_get_flavour (ibfd) != bfd_target_elf_flavour |
252b5132 RH |
1996 | || bfd_get_flavour (obfd) != bfd_target_elf_flavour) |
1997 | return true; | |
1998 | ||
fc830a83 | 1999 | in_flags = elf_elfheader (ibfd)->e_flags; |
252b5132 RH |
2000 | out_flags = elf_elfheader (obfd)->e_flags; |
2001 | ||
fc830a83 NC |
2002 | if (elf_flags_init (obfd) |
2003 | && EF_ARM_EABI_VERSION (out_flags) == EF_ARM_EABI_UNKNOWN | |
2004 | && in_flags != out_flags) | |
252b5132 | 2005 | { |
252b5132 RH |
2006 | /* Cannot mix APCS26 and APCS32 code. */ |
2007 | if ((in_flags & EF_APCS_26) != (out_flags & EF_APCS_26)) | |
2008 | return false; | |
2009 | ||
2010 | /* Cannot mix float APCS and non-float APCS code. */ | |
2011 | if ((in_flags & EF_APCS_FLOAT) != (out_flags & EF_APCS_FLOAT)) | |
2012 | return false; | |
2013 | ||
2014 | /* If the src and dest have different interworking flags | |
2015 | then turn off the interworking bit. */ | |
2016 | if ((in_flags & EF_INTERWORK) != (out_flags & EF_INTERWORK)) | |
2017 | { | |
2018 | if (out_flags & EF_INTERWORK) | |
9b485d32 | 2019 | _bfd_error_handler (_("\ |
252b5132 RH |
2020 | Warning: Clearing the interwork flag in %s because non-interworking code in %s has been linked with it"), |
2021 | bfd_get_filename (obfd), bfd_get_filename (ibfd)); | |
2022 | ||
2023 | in_flags &= ~EF_INTERWORK; | |
2024 | } | |
1006ba19 PB |
2025 | |
2026 | /* Likewise for PIC, though don't warn for this case. */ | |
2027 | if ((in_flags & EF_PIC) != (out_flags & EF_PIC)) | |
2028 | in_flags &= ~EF_PIC; | |
252b5132 RH |
2029 | } |
2030 | ||
2031 | elf_elfheader (obfd)->e_flags = in_flags; | |
2032 | elf_flags_init (obfd) = true; | |
2033 | ||
2034 | return true; | |
2035 | } | |
2036 | ||
2037 | /* Merge backend specific data from an object file to the output | |
2038 | object file when linking. */ | |
9b485d32 | 2039 | |
252b5132 RH |
2040 | static boolean |
2041 | elf32_arm_merge_private_bfd_data (ibfd, obfd) | |
fc830a83 NC |
2042 | bfd * ibfd; |
2043 | bfd * obfd; | |
252b5132 RH |
2044 | { |
2045 | flagword out_flags; | |
2046 | flagword in_flags; | |
1006ba19 | 2047 | boolean flags_compatible = true; |
cf919dfd PB |
2048 | boolean null_input_bfd = true; |
2049 | asection *sec; | |
252b5132 | 2050 | |
9b485d32 | 2051 | /* Check if we have the same endianess. */ |
1fe494a5 NC |
2052 | if (_bfd_generic_verify_endian_match (ibfd, obfd) == false) |
2053 | return false; | |
2054 | ||
252b5132 RH |
2055 | if ( bfd_get_flavour (ibfd) != bfd_target_elf_flavour |
2056 | || bfd_get_flavour (obfd) != bfd_target_elf_flavour) | |
2057 | return true; | |
2058 | ||
252b5132 RH |
2059 | /* The input BFD must have had its flags initialised. */ |
2060 | /* The following seems bogus to me -- The flags are initialized in | |
2061 | the assembler but I don't think an elf_flags_init field is | |
9b485d32 | 2062 | written into the object. */ |
252b5132 RH |
2063 | /* BFD_ASSERT (elf_flags_init (ibfd)); */ |
2064 | ||
2065 | in_flags = elf_elfheader (ibfd)->e_flags; | |
2066 | out_flags = elf_elfheader (obfd)->e_flags; | |
2067 | ||
2068 | if (!elf_flags_init (obfd)) | |
2069 | { | |
fe077fa6 NC |
2070 | /* If the input is the default architecture and had the default |
2071 | flags then do not bother setting the flags for the output | |
2072 | architecture, instead allow future merges to do this. If no | |
2073 | future merges ever set these flags then they will retain their | |
2074 | uninitialised values, which surprise surprise, correspond | |
252b5132 | 2075 | to the default values. */ |
fe077fa6 NC |
2076 | if (bfd_get_arch_info (ibfd)->the_default |
2077 | && elf_elfheader (ibfd)->e_flags == 0) | |
252b5132 RH |
2078 | return true; |
2079 | ||
2080 | elf_flags_init (obfd) = true; | |
2081 | elf_elfheader (obfd)->e_flags = in_flags; | |
2082 | ||
2083 | if (bfd_get_arch (obfd) == bfd_get_arch (ibfd) | |
2084 | && bfd_get_arch_info (obfd)->the_default) | |
2085 | return bfd_set_arch_mach (obfd, bfd_get_arch (ibfd), bfd_get_mach (ibfd)); | |
2086 | ||
2087 | return true; | |
2088 | } | |
2089 | ||
1006ba19 | 2090 | /* Identical flags must be compatible. */ |
252b5132 RH |
2091 | if (in_flags == out_flags) |
2092 | return true; | |
2093 | ||
cf919dfd PB |
2094 | /* Check to see if the input BFD actually contains any sections. |
2095 | If not, its flags may not have been initialised either, but it cannot | |
2096 | actually cause any incompatibility. */ | |
2097 | for (sec = ibfd->sections; sec != NULL; sec = sec->next) | |
2098 | { | |
2099 | /* Ignore synthetic glue sections. */ | |
2100 | if (strcmp (sec->name, ".glue_7") | |
2101 | && strcmp (sec->name, ".glue_7t")) | |
2102 | { | |
2103 | null_input_bfd = false; | |
2104 | break; | |
2105 | } | |
2106 | } | |
2107 | if (null_input_bfd) | |
2108 | return true; | |
2109 | ||
252b5132 | 2110 | /* Complain about various flag mismatches. */ |
fc830a83 NC |
2111 | if (EF_ARM_EABI_VERSION (in_flags) != EF_ARM_EABI_VERSION (out_flags)) |
2112 | { | |
2113 | _bfd_error_handler (_("\ | |
2114 | Error: %s compiled for EABI version %d, whereas %s is compiled for version %d"), | |
2115 | bfd_get_filename (ibfd), | |
2116 | (in_flags & EF_ARM_EABIMASK) >> 24, | |
2117 | bfd_get_filename (obfd), | |
2118 | (out_flags & EF_ARM_EABIMASK) >> 24); | |
1006ba19 | 2119 | return false; |
fc830a83 | 2120 | } |
252b5132 | 2121 | |
1006ba19 PB |
2122 | /* Not sure what needs to be checked for EABI versions >= 1. */ |
2123 | if (EF_ARM_EABI_VERSION (in_flags) == EF_ARM_EABI_UNKNOWN) | |
2124 | { | |
2125 | if ((in_flags & EF_APCS_26) != (out_flags & EF_APCS_26)) | |
2126 | { | |
2127 | _bfd_error_handler (_("\ | |
252b5132 RH |
2128 | Error: %s compiled for APCS-%d, whereas %s is compiled for APCS-%d"), |
2129 | bfd_get_filename (ibfd), | |
2130 | in_flags & EF_APCS_26 ? 26 : 32, | |
2131 | bfd_get_filename (obfd), | |
2132 | out_flags & EF_APCS_26 ? 26 : 32); | |
1006ba19 PB |
2133 | flags_compatible = false; |
2134 | } | |
252b5132 | 2135 | |
1006ba19 PB |
2136 | if ((in_flags & EF_APCS_FLOAT) != (out_flags & EF_APCS_FLOAT)) |
2137 | { | |
2138 | _bfd_error_handler (_("\ | |
252b5132 RH |
2139 | Error: %s passes floats in %s registers, whereas %s passes them in %s registers"), |
2140 | bfd_get_filename (ibfd), | |
9b485d32 | 2141 | in_flags & EF_APCS_FLOAT ? _("float") : _("integer"), |
252b5132 | 2142 | bfd_get_filename (obfd), |
9b485d32 | 2143 | out_flags & EF_APCS_26 ? _("float") : _("integer")); |
1006ba19 PB |
2144 | flags_compatible = false; |
2145 | } | |
252b5132 | 2146 | |
ee43f35e | 2147 | #ifdef EF_SOFT_FLOAT |
1006ba19 PB |
2148 | if ((in_flags & EF_SOFT_FLOAT) != (out_flags & EF_SOFT_FLOAT)) |
2149 | { | |
2150 | _bfd_error_handler (_ ("\ | |
2151 | Error: %s uses %s floating point, whereas %s uses %s floating point"), | |
2152 | bfd_get_filename (ibfd), | |
2153 | in_flags & EF_SOFT_FLOAT ? _("soft") : _("hard"), | |
2154 | bfd_get_filename (obfd), | |
2155 | out_flags & EF_SOFT_FLOAT ? _("soft") : _("hard")); | |
2156 | flags_compatible = false; | |
2157 | } | |
ee43f35e | 2158 | #endif |
252b5132 | 2159 | |
1006ba19 PB |
2160 | /* Interworking mismatch is only a warning. */ |
2161 | if ((in_flags & EF_INTERWORK) != (out_flags & EF_INTERWORK)) | |
2162 | _bfd_error_handler (_("\ | |
252b5132 RH |
2163 | Warning: %s %s interworking, whereas %s %s"), |
2164 | bfd_get_filename (ibfd), | |
9b485d32 | 2165 | in_flags & EF_INTERWORK ? _("supports") : _("does not support"), |
252b5132 | 2166 | bfd_get_filename (obfd), |
9b485d32 | 2167 | out_flags & EF_INTERWORK ? _("does not") : _("does")); |
252b5132 RH |
2168 | } |
2169 | ||
1006ba19 | 2170 | return flags_compatible; |
252b5132 RH |
2171 | } |
2172 | ||
9b485d32 NC |
2173 | /* Display the flags field. */ |
2174 | ||
252b5132 RH |
2175 | static boolean |
2176 | elf32_arm_print_private_bfd_data (abfd, ptr) | |
2177 | bfd *abfd; | |
2178 | PTR ptr; | |
2179 | { | |
fc830a83 NC |
2180 | FILE * file = (FILE *) ptr; |
2181 | unsigned long flags; | |
252b5132 RH |
2182 | |
2183 | BFD_ASSERT (abfd != NULL && ptr != NULL); | |
2184 | ||
2185 | /* Print normal ELF private data. */ | |
2186 | _bfd_elf_print_private_bfd_data (abfd, ptr); | |
2187 | ||
fc830a83 | 2188 | flags = elf_elfheader (abfd)->e_flags; |
9b485d32 NC |
2189 | /* Ignore init flag - it may not be set, despite the flags field |
2190 | containing valid data. */ | |
252b5132 RH |
2191 | |
2192 | /* xgettext:c-format */ | |
9b485d32 | 2193 | fprintf (file, _("private flags = %lx:"), elf_elfheader (abfd)->e_flags); |
252b5132 | 2194 | |
fc830a83 NC |
2195 | switch (EF_ARM_EABI_VERSION (flags)) |
2196 | { | |
2197 | case EF_ARM_EABI_UNKNOWN: | |
2198 | /* The following flag bits are GNU extenstions and not part of the | |
2199 | official ARM ELF extended ABI. Hence they are only decoded if | |
2200 | the EABI version is not set. */ | |
2201 | if (flags & EF_INTERWORK) | |
9b485d32 | 2202 | fprintf (file, _(" [interworking enabled]")); |
9a5aca8c | 2203 | |
fc830a83 | 2204 | if (flags & EF_APCS_26) |
9b485d32 | 2205 | fprintf (file, _(" [APCS-26]")); |
fc830a83 | 2206 | else |
9b485d32 | 2207 | fprintf (file, _(" [APCS-32]")); |
9a5aca8c | 2208 | |
fc830a83 | 2209 | if (flags & EF_APCS_FLOAT) |
9b485d32 | 2210 | fprintf (file, _(" [floats passed in float registers]")); |
9a5aca8c | 2211 | |
fc830a83 | 2212 | if (flags & EF_PIC) |
9b485d32 | 2213 | fprintf (file, _(" [position independent]")); |
fc830a83 NC |
2214 | |
2215 | if (flags & EF_NEW_ABI) | |
9b485d32 | 2216 | fprintf (file, _(" [new ABI]")); |
9a5aca8c | 2217 | |
fc830a83 | 2218 | if (flags & EF_OLD_ABI) |
9b485d32 | 2219 | fprintf (file, _(" [old ABI]")); |
9a5aca8c | 2220 | |
fc830a83 | 2221 | if (flags & EF_SOFT_FLOAT) |
9b485d32 | 2222 | fprintf (file, _(" [software FP]")); |
9a5aca8c | 2223 | |
fc830a83 NC |
2224 | flags &= ~(EF_INTERWORK | EF_APCS_26 | EF_APCS_FLOAT | EF_PIC |
2225 | | EF_NEW_ABI | EF_OLD_ABI | EF_SOFT_FLOAT); | |
2226 | break; | |
9a5aca8c | 2227 | |
fc830a83 | 2228 | case EF_ARM_EABI_VER1: |
9b485d32 | 2229 | fprintf (file, _(" [Version1 EABI]")); |
9a5aca8c | 2230 | |
fc830a83 | 2231 | if (flags & EF_ARM_SYMSARESORTED) |
9b485d32 | 2232 | fprintf (file, _(" [sorted symbol table]")); |
fc830a83 | 2233 | else |
9b485d32 | 2234 | fprintf (file, _(" [unsorted symbol table]")); |
9a5aca8c | 2235 | |
fc830a83 NC |
2236 | flags &= ~ EF_ARM_SYMSARESORTED; |
2237 | break; | |
9a5aca8c | 2238 | |
fc830a83 | 2239 | default: |
9b485d32 | 2240 | fprintf (file, _(" <EABI version unrecognised>")); |
fc830a83 NC |
2241 | break; |
2242 | } | |
252b5132 | 2243 | |
fc830a83 | 2244 | flags &= ~ EF_ARM_EABIMASK; |
252b5132 | 2245 | |
fc830a83 | 2246 | if (flags & EF_ARM_RELEXEC) |
9b485d32 | 2247 | fprintf (file, _(" [relocatable executable]")); |
252b5132 | 2248 | |
fc830a83 | 2249 | if (flags & EF_ARM_HASENTRY) |
9b485d32 | 2250 | fprintf (file, _(" [has entry point]")); |
252b5132 | 2251 | |
fc830a83 NC |
2252 | flags &= ~ (EF_ARM_RELEXEC | EF_ARM_HASENTRY); |
2253 | ||
2254 | if (flags) | |
9b485d32 | 2255 | fprintf (file, _("<Unrecognised flag bits set>")); |
9a5aca8c | 2256 | |
252b5132 RH |
2257 | fputc ('\n', file); |
2258 | ||
2259 | return true; | |
2260 | } | |
2261 | ||
2262 | static int | |
2263 | elf32_arm_get_symbol_type (elf_sym, type) | |
2264 | Elf_Internal_Sym * elf_sym; | |
2265 | int type; | |
2266 | { | |
2f0ca46a NC |
2267 | switch (ELF_ST_TYPE (elf_sym->st_info)) |
2268 | { | |
2269 | case STT_ARM_TFUNC: | |
2270 | return ELF_ST_TYPE (elf_sym->st_info); | |
ce855c42 | 2271 | |
2f0ca46a NC |
2272 | case STT_ARM_16BIT: |
2273 | /* If the symbol is not an object, return the STT_ARM_16BIT flag. | |
2274 | This allows us to distinguish between data used by Thumb instructions | |
2275 | and non-data (which is probably code) inside Thumb regions of an | |
2276 | executable. */ | |
2277 | if (type != STT_OBJECT) | |
2278 | return ELF_ST_TYPE (elf_sym->st_info); | |
2279 | break; | |
9a5aca8c | 2280 | |
ce855c42 NC |
2281 | default: |
2282 | break; | |
2f0ca46a NC |
2283 | } |
2284 | ||
2285 | return type; | |
252b5132 | 2286 | } |
f21f3fe0 | 2287 | |
252b5132 RH |
2288 | static asection * |
2289 | elf32_arm_gc_mark_hook (abfd, info, rel, h, sym) | |
2290 | bfd *abfd; | |
5f771d47 | 2291 | struct bfd_link_info *info ATTRIBUTE_UNUSED; |
252b5132 RH |
2292 | Elf_Internal_Rela *rel; |
2293 | struct elf_link_hash_entry *h; | |
2294 | Elf_Internal_Sym *sym; | |
2295 | { | |
2296 | if (h != NULL) | |
2297 | { | |
2298 | switch (ELF32_R_TYPE (rel->r_info)) | |
2299 | { | |
2300 | case R_ARM_GNU_VTINHERIT: | |
2301 | case R_ARM_GNU_VTENTRY: | |
2302 | break; | |
2303 | ||
2304 | default: | |
2305 | switch (h->root.type) | |
2306 | { | |
2307 | case bfd_link_hash_defined: | |
2308 | case bfd_link_hash_defweak: | |
2309 | return h->root.u.def.section; | |
2310 | ||
2311 | case bfd_link_hash_common: | |
2312 | return h->root.u.c.p->section; | |
e049a0de ILT |
2313 | |
2314 | default: | |
2315 | break; | |
252b5132 RH |
2316 | } |
2317 | } | |
2318 | } | |
2319 | else | |
2320 | { | |
2321 | if (!(elf_bad_symtab (abfd) | |
2322 | && ELF_ST_BIND (sym->st_info) != STB_LOCAL) | |
2323 | && ! ((sym->st_shndx <= 0 || sym->st_shndx >= SHN_LORESERVE) | |
2324 | && sym->st_shndx != SHN_COMMON)) | |
2325 | { | |
2326 | return bfd_section_from_elf_index (abfd, sym->st_shndx); | |
2327 | } | |
2328 | } | |
2329 | return NULL; | |
2330 | } | |
2331 | ||
780a67af NC |
2332 | /* Update the got entry reference counts for the section being removed. */ |
2333 | ||
252b5132 RH |
2334 | static boolean |
2335 | elf32_arm_gc_sweep_hook (abfd, info, sec, relocs) | |
5f771d47 ILT |
2336 | bfd *abfd ATTRIBUTE_UNUSED; |
2337 | struct bfd_link_info *info ATTRIBUTE_UNUSED; | |
2338 | asection *sec ATTRIBUTE_UNUSED; | |
2339 | const Elf_Internal_Rela *relocs ATTRIBUTE_UNUSED; | |
252b5132 | 2340 | { |
780a67af | 2341 | /* We don't support garbage collection of GOT and PLT relocs yet. */ |
252b5132 RH |
2342 | return true; |
2343 | } | |
2344 | ||
780a67af NC |
2345 | /* Look through the relocs for a section during the first phase. */ |
2346 | ||
252b5132 RH |
2347 | static boolean |
2348 | elf32_arm_check_relocs (abfd, info, sec, relocs) | |
2349 | bfd * abfd; | |
2350 | struct bfd_link_info * info; | |
2351 | asection * sec; | |
2352 | const Elf_Internal_Rela * relocs; | |
2353 | { | |
2354 | Elf_Internal_Shdr * symtab_hdr; | |
2355 | struct elf_link_hash_entry ** sym_hashes; | |
2356 | struct elf_link_hash_entry ** sym_hashes_end; | |
2357 | const Elf_Internal_Rela * rel; | |
2358 | const Elf_Internal_Rela * rel_end; | |
2359 | bfd * dynobj; | |
2360 | asection * sgot, *srelgot, *sreloc; | |
2361 | bfd_vma * local_got_offsets; | |
9a5aca8c | 2362 | |
252b5132 RH |
2363 | if (info->relocateable) |
2364 | return true; | |
9a5aca8c | 2365 | |
252b5132 | 2366 | sgot = srelgot = sreloc = NULL; |
9a5aca8c | 2367 | |
252b5132 RH |
2368 | dynobj = elf_hash_table (info)->dynobj; |
2369 | local_got_offsets = elf_local_got_offsets (abfd); | |
f21f3fe0 | 2370 | |
252b5132 RH |
2371 | symtab_hdr = &elf_tdata (abfd)->symtab_hdr; |
2372 | sym_hashes = elf_sym_hashes (abfd); | |
9b485d32 NC |
2373 | sym_hashes_end = sym_hashes |
2374 | + symtab_hdr->sh_size / sizeof (Elf32_External_Sym); | |
2375 | ||
252b5132 RH |
2376 | if (!elf_bad_symtab (abfd)) |
2377 | sym_hashes_end -= symtab_hdr->sh_info; | |
9b485d32 | 2378 | |
252b5132 RH |
2379 | rel_end = relocs + sec->reloc_count; |
2380 | for (rel = relocs; rel < rel_end; rel++) | |
2381 | { | |
2382 | struct elf_link_hash_entry *h; | |
2383 | unsigned long r_symndx; | |
9a5aca8c | 2384 | |
252b5132 RH |
2385 | r_symndx = ELF32_R_SYM (rel->r_info); |
2386 | if (r_symndx < symtab_hdr->sh_info) | |
2387 | h = NULL; | |
2388 | else | |
2389 | h = sym_hashes[r_symndx - symtab_hdr->sh_info]; | |
9a5aca8c | 2390 | |
252b5132 RH |
2391 | /* Some relocs require a global offset table. */ |
2392 | if (dynobj == NULL) | |
2393 | { | |
2394 | switch (ELF32_R_TYPE (rel->r_info)) | |
2395 | { | |
2396 | case R_ARM_GOT32: | |
2397 | case R_ARM_GOTOFF: | |
2398 | case R_ARM_GOTPC: | |
2399 | elf_hash_table (info)->dynobj = dynobj = abfd; | |
2400 | if (! _bfd_elf_create_got_section (dynobj, info)) | |
2401 | return false; | |
2402 | break; | |
2403 | ||
2404 | default: | |
2405 | break; | |
2406 | } | |
2407 | } | |
2408 | ||
2409 | switch (ELF32_R_TYPE (rel->r_info)) | |
2410 | { | |
2411 | case R_ARM_GOT32: | |
2412 | /* This symbol requires a global offset table entry. */ | |
2413 | if (sgot == NULL) | |
2414 | { | |
2415 | sgot = bfd_get_section_by_name (dynobj, ".got"); | |
2416 | BFD_ASSERT (sgot != NULL); | |
2417 | } | |
2418 | ||
2419 | /* Get the got relocation section if necessary. */ | |
2420 | if (srelgot == NULL | |
2421 | && (h != NULL || info->shared)) | |
2422 | { | |
2423 | srelgot = bfd_get_section_by_name (dynobj, ".rel.got"); | |
9a5aca8c | 2424 | |
252b5132 RH |
2425 | /* If no got relocation section, make one and initialize. */ |
2426 | if (srelgot == NULL) | |
2427 | { | |
2428 | srelgot = bfd_make_section (dynobj, ".rel.got"); | |
2429 | if (srelgot == NULL | |
2430 | || ! bfd_set_section_flags (dynobj, srelgot, | |
2431 | (SEC_ALLOC | |
2432 | | SEC_LOAD | |
2433 | | SEC_HAS_CONTENTS | |
2434 | | SEC_IN_MEMORY | |
2435 | | SEC_LINKER_CREATED | |
2436 | | SEC_READONLY)) | |
2437 | || ! bfd_set_section_alignment (dynobj, srelgot, 2)) | |
2438 | return false; | |
2439 | } | |
2440 | } | |
2441 | ||
2442 | if (h != NULL) | |
2443 | { | |
2444 | if (h->got.offset != (bfd_vma) -1) | |
2445 | /* We have already allocated space in the .got. */ | |
2446 | break; | |
f21f3fe0 | 2447 | |
252b5132 RH |
2448 | h->got.offset = sgot->_raw_size; |
2449 | ||
2450 | /* Make sure this symbol is output as a dynamic symbol. */ | |
2451 | if (h->dynindx == -1) | |
2452 | if (! bfd_elf32_link_record_dynamic_symbol (info, h)) | |
2453 | return false; | |
2454 | ||
2455 | srelgot->_raw_size += sizeof (Elf32_External_Rel); | |
2456 | } | |
2457 | else | |
2458 | { | |
2459 | /* This is a global offset table entry for a local | |
2460 | symbol. */ | |
2461 | if (local_got_offsets == NULL) | |
2462 | { | |
2463 | size_t size; | |
2464 | register unsigned int i; | |
2465 | ||
2466 | size = symtab_hdr->sh_info * sizeof (bfd_vma); | |
2467 | local_got_offsets = (bfd_vma *) bfd_alloc (abfd, size); | |
2468 | if (local_got_offsets == NULL) | |
2469 | return false; | |
2470 | elf_local_got_offsets (abfd) = local_got_offsets; | |
2471 | for (i = 0; i < symtab_hdr->sh_info; i++) | |
2472 | local_got_offsets[i] = (bfd_vma) -1; | |
2473 | } | |
f21f3fe0 | 2474 | |
252b5132 RH |
2475 | if (local_got_offsets[r_symndx] != (bfd_vma) -1) |
2476 | /* We have already allocated space in the .got. */ | |
2477 | break; | |
2478 | ||
2479 | local_got_offsets[r_symndx] = sgot->_raw_size; | |
2480 | ||
2481 | if (info->shared) | |
2482 | /* If we are generating a shared object, we need to | |
2483 | output a R_ARM_RELATIVE reloc so that the dynamic | |
2484 | linker can adjust this GOT entry. */ | |
2485 | srelgot->_raw_size += sizeof (Elf32_External_Rel); | |
2486 | } | |
2487 | ||
2488 | sgot->_raw_size += 4; | |
2489 | break; | |
2490 | ||
2491 | case R_ARM_PLT32: | |
2492 | /* This symbol requires a procedure linkage table entry. We | |
2493 | actually build the entry in adjust_dynamic_symbol, | |
2494 | because this might be a case of linking PIC code which is | |
2495 | never referenced by a dynamic object, in which case we | |
2496 | don't need to generate a procedure linkage table entry | |
2497 | after all. */ | |
2498 | ||
2499 | /* If this is a local symbol, we resolve it directly without | |
2500 | creating a procedure linkage table entry. */ | |
2501 | if (h == NULL) | |
2502 | continue; | |
2503 | ||
2504 | h->elf_link_hash_flags |= ELF_LINK_HASH_NEEDS_PLT; | |
2505 | break; | |
2506 | ||
2507 | case R_ARM_ABS32: | |
2508 | case R_ARM_REL32: | |
2509 | case R_ARM_PC24: | |
2510 | /* If we are creating a shared library, and this is a reloc | |
2511 | against a global symbol, or a non PC relative reloc | |
2512 | against a local symbol, then we need to copy the reloc | |
2513 | into the shared library. However, if we are linking with | |
2514 | -Bsymbolic, we do not need to copy a reloc against a | |
2515 | global symbol which is defined in an object we are | |
2516 | including in the link (i.e., DEF_REGULAR is set). At | |
2517 | this point we have not seen all the input files, so it is | |
2518 | possible that DEF_REGULAR is not set now but will be set | |
2519 | later (it is never cleared). We account for that | |
2520 | possibility below by storing information in the | |
2521 | pcrel_relocs_copied field of the hash table entry. */ | |
2522 | if (info->shared | |
2523 | && (ELF32_R_TYPE (rel->r_info) != R_ARM_PC24 | |
2524 | || (h != NULL | |
2525 | && (! info->symbolic | |
2526 | || (h->elf_link_hash_flags | |
2527 | & ELF_LINK_HASH_DEF_REGULAR) == 0)))) | |
2528 | { | |
2529 | /* When creating a shared object, we must copy these | |
2530 | reloc types into the output file. We create a reloc | |
2531 | section in dynobj and make room for this reloc. */ | |
2532 | if (sreloc == NULL) | |
2533 | { | |
2534 | const char * name; | |
2535 | ||
2536 | name = (bfd_elf_string_from_elf_section | |
2537 | (abfd, | |
2538 | elf_elfheader (abfd)->e_shstrndx, | |
2539 | elf_section_data (sec)->rel_hdr.sh_name)); | |
2540 | if (name == NULL) | |
2541 | return false; | |
2542 | ||
2543 | BFD_ASSERT (strncmp (name, ".rel", 4) == 0 | |
2544 | && strcmp (bfd_get_section_name (abfd, sec), | |
2545 | name + 4) == 0); | |
2546 | ||
2547 | sreloc = bfd_get_section_by_name (dynobj, name); | |
2548 | if (sreloc == NULL) | |
2549 | { | |
2550 | flagword flags; | |
2551 | ||
2552 | sreloc = bfd_make_section (dynobj, name); | |
2553 | flags = (SEC_HAS_CONTENTS | SEC_READONLY | |
2554 | | SEC_IN_MEMORY | SEC_LINKER_CREATED); | |
2555 | if ((sec->flags & SEC_ALLOC) != 0) | |
2556 | flags |= SEC_ALLOC | SEC_LOAD; | |
2557 | if (sreloc == NULL | |
2558 | || ! bfd_set_section_flags (dynobj, sreloc, flags) | |
2559 | || ! bfd_set_section_alignment (dynobj, sreloc, 2)) | |
2560 | return false; | |
2561 | } | |
2562 | } | |
2563 | ||
2564 | sreloc->_raw_size += sizeof (Elf32_External_Rel); | |
2565 | /* If we are linking with -Bsymbolic, and this is a | |
2566 | global symbol, we count the number of PC relative | |
2567 | relocations we have entered for this symbol, so that | |
2568 | we can discard them again if the symbol is later | |
2569 | defined by a regular object. Note that this function | |
2570 | is only called if we are using an elf_i386 linker | |
2571 | hash table, which means that h is really a pointer to | |
2572 | an elf_i386_link_hash_entry. */ | |
2573 | if (h != NULL && info->symbolic | |
2574 | && ELF32_R_TYPE (rel->r_info) == R_ARM_PC24) | |
2575 | { | |
2576 | struct elf32_arm_link_hash_entry * eh; | |
2577 | struct elf32_arm_pcrel_relocs_copied * p; | |
2578 | ||
2579 | eh = (struct elf32_arm_link_hash_entry *) h; | |
2580 | ||
2581 | for (p = eh->pcrel_relocs_copied; p != NULL; p = p->next) | |
2582 | if (p->section == sreloc) | |
2583 | break; | |
2584 | ||
2585 | if (p == NULL) | |
2586 | { | |
2587 | p = ((struct elf32_arm_pcrel_relocs_copied *) | |
2588 | bfd_alloc (dynobj, sizeof * p)); | |
f21f3fe0 | 2589 | |
252b5132 RH |
2590 | if (p == NULL) |
2591 | return false; | |
2592 | p->next = eh->pcrel_relocs_copied; | |
2593 | eh->pcrel_relocs_copied = p; | |
2594 | p->section = sreloc; | |
2595 | p->count = 0; | |
2596 | } | |
2597 | ||
2598 | ++p->count; | |
2599 | } | |
2600 | } | |
2601 | break; | |
2602 | ||
2603 | /* This relocation describes the C++ object vtable hierarchy. | |
2604 | Reconstruct it for later use during GC. */ | |
2605 | case R_ARM_GNU_VTINHERIT: | |
2606 | if (!_bfd_elf32_gc_record_vtinherit (abfd, sec, h, rel->r_offset)) | |
2607 | return false; | |
2608 | break; | |
9a5aca8c | 2609 | |
252b5132 RH |
2610 | /* This relocation describes which C++ vtable entries are actually |
2611 | used. Record for later use during GC. */ | |
2612 | case R_ARM_GNU_VTENTRY: | |
d512aa07 | 2613 | if (!_bfd_elf32_gc_record_vtentry (abfd, sec, h, rel->r_offset)) |
252b5132 RH |
2614 | return false; |
2615 | break; | |
2616 | } | |
2617 | } | |
f21f3fe0 | 2618 | |
252b5132 RH |
2619 | return true; |
2620 | } | |
2621 | ||
252b5132 RH |
2622 | /* Find the nearest line to a particular section and offset, for error |
2623 | reporting. This code is a duplicate of the code in elf.c, except | |
9b485d32 | 2624 | that it also accepts STT_ARM_TFUNC as a symbol that names a function. */ |
252b5132 RH |
2625 | |
2626 | static boolean | |
2627 | elf32_arm_find_nearest_line | |
2628 | (abfd, section, symbols, offset, filename_ptr, functionname_ptr, line_ptr) | |
2629 | bfd * abfd; | |
2630 | asection * section; | |
2631 | asymbol ** symbols; | |
2632 | bfd_vma offset; | |
2633 | CONST char ** filename_ptr; | |
2634 | CONST char ** functionname_ptr; | |
2635 | unsigned int * line_ptr; | |
2636 | { | |
2637 | boolean found; | |
2638 | const char * filename; | |
2639 | asymbol * func; | |
2640 | bfd_vma low_func; | |
2641 | asymbol ** p; | |
2642 | ||
2643 | if (_bfd_dwarf2_find_nearest_line (abfd, section, symbols, offset, | |
f21f3fe0 | 2644 | filename_ptr, functionname_ptr, |
857ec808 NC |
2645 | line_ptr, 0, |
2646 | &elf_tdata (abfd)->dwarf2_find_line_info)) | |
252b5132 RH |
2647 | return true; |
2648 | ||
2649 | if (! _bfd_stab_section_find_nearest_line (abfd, symbols, section, offset, | |
2650 | &found, filename_ptr, | |
2651 | functionname_ptr, line_ptr, | |
2652 | &elf_tdata (abfd)->line_info)) | |
2653 | return false; | |
f21f3fe0 | 2654 | |
252b5132 RH |
2655 | if (found) |
2656 | return true; | |
2657 | ||
2658 | if (symbols == NULL) | |
2659 | return false; | |
2660 | ||
2661 | filename = NULL; | |
2662 | func = NULL; | |
2663 | low_func = 0; | |
2664 | ||
2665 | for (p = symbols; *p != NULL; p++) | |
2666 | { | |
2667 | elf_symbol_type *q; | |
2668 | ||
2669 | q = (elf_symbol_type *) *p; | |
2670 | ||
2671 | if (bfd_get_section (&q->symbol) != section) | |
2672 | continue; | |
2673 | ||
2674 | switch (ELF_ST_TYPE (q->internal_elf_sym.st_info)) | |
2675 | { | |
2676 | default: | |
2677 | break; | |
2678 | case STT_FILE: | |
2679 | filename = bfd_asymbol_name (&q->symbol); | |
2680 | break; | |
2681 | case STT_NOTYPE: | |
2682 | case STT_FUNC: | |
2683 | case STT_ARM_TFUNC: | |
2684 | if (q->symbol.section == section | |
2685 | && q->symbol.value >= low_func | |
2686 | && q->symbol.value <= offset) | |
2687 | { | |
2688 | func = (asymbol *) q; | |
2689 | low_func = q->symbol.value; | |
2690 | } | |
2691 | break; | |
2692 | } | |
2693 | } | |
2694 | ||
2695 | if (func == NULL) | |
2696 | return false; | |
2697 | ||
2698 | *filename_ptr = filename; | |
2699 | *functionname_ptr = bfd_asymbol_name (func); | |
2700 | *line_ptr = 0; | |
f21f3fe0 | 2701 | |
252b5132 RH |
2702 | return true; |
2703 | } | |
2704 | ||
2705 | /* Adjust a symbol defined by a dynamic object and referenced by a | |
2706 | regular object. The current definition is in some section of the | |
2707 | dynamic object, but we're not including those sections. We have to | |
2708 | change the definition to something the rest of the link can | |
2709 | understand. */ | |
2710 | ||
2711 | static boolean | |
2712 | elf32_arm_adjust_dynamic_symbol (info, h) | |
2713 | struct bfd_link_info * info; | |
2714 | struct elf_link_hash_entry * h; | |
2715 | { | |
2716 | bfd * dynobj; | |
2717 | asection * s; | |
2718 | unsigned int power_of_two; | |
2719 | ||
2720 | dynobj = elf_hash_table (info)->dynobj; | |
2721 | ||
2722 | /* Make sure we know what is going on here. */ | |
2723 | BFD_ASSERT (dynobj != NULL | |
2724 | && ((h->elf_link_hash_flags & ELF_LINK_HASH_NEEDS_PLT) | |
2725 | || h->weakdef != NULL | |
2726 | || ((h->elf_link_hash_flags | |
2727 | & ELF_LINK_HASH_DEF_DYNAMIC) != 0 | |
2728 | && (h->elf_link_hash_flags | |
2729 | & ELF_LINK_HASH_REF_REGULAR) != 0 | |
2730 | && (h->elf_link_hash_flags | |
2731 | & ELF_LINK_HASH_DEF_REGULAR) == 0))); | |
2732 | ||
2733 | /* If this is a function, put it in the procedure linkage table. We | |
2734 | will fill in the contents of the procedure linkage table later, | |
2735 | when we know the address of the .got section. */ | |
2736 | if (h->type == STT_FUNC | |
2737 | || (h->elf_link_hash_flags & ELF_LINK_HASH_NEEDS_PLT) != 0) | |
2738 | { | |
2739 | if (! info->shared | |
2740 | && (h->elf_link_hash_flags & ELF_LINK_HASH_DEF_DYNAMIC) == 0 | |
2741 | && (h->elf_link_hash_flags & ELF_LINK_HASH_REF_DYNAMIC) == 0) | |
2742 | { | |
2743 | /* This case can occur if we saw a PLT32 reloc in an input | |
2744 | file, but the symbol was never referred to by a dynamic | |
2745 | object. In such a case, we don't actually need to build | |
2746 | a procedure linkage table, and we can just do a PC32 | |
2747 | reloc instead. */ | |
2748 | BFD_ASSERT ((h->elf_link_hash_flags & ELF_LINK_HASH_NEEDS_PLT) != 0); | |
2749 | return true; | |
2750 | } | |
2751 | ||
2752 | /* Make sure this symbol is output as a dynamic symbol. */ | |
2753 | if (h->dynindx == -1) | |
2754 | { | |
2755 | if (! bfd_elf32_link_record_dynamic_symbol (info, h)) | |
2756 | return false; | |
2757 | } | |
2758 | ||
2759 | s = bfd_get_section_by_name (dynobj, ".plt"); | |
2760 | BFD_ASSERT (s != NULL); | |
2761 | ||
2762 | /* If this is the first .plt entry, make room for the special | |
2763 | first entry. */ | |
2764 | if (s->_raw_size == 0) | |
2765 | s->_raw_size += PLT_ENTRY_SIZE; | |
2766 | ||
2767 | /* If this symbol is not defined in a regular file, and we are | |
2768 | not generating a shared library, then set the symbol to this | |
2769 | location in the .plt. This is required to make function | |
2770 | pointers compare as equal between the normal executable and | |
2771 | the shared library. */ | |
2772 | if (! info->shared | |
2773 | && (h->elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR) == 0) | |
2774 | { | |
2775 | h->root.u.def.section = s; | |
2776 | h->root.u.def.value = s->_raw_size; | |
2777 | } | |
2778 | ||
2779 | h->plt.offset = s->_raw_size; | |
2780 | ||
2781 | /* Make room for this entry. */ | |
2782 | s->_raw_size += PLT_ENTRY_SIZE; | |
2783 | ||
2784 | /* We also need to make an entry in the .got.plt section, which | |
2785 | will be placed in the .got section by the linker script. */ | |
252b5132 RH |
2786 | s = bfd_get_section_by_name (dynobj, ".got.plt"); |
2787 | BFD_ASSERT (s != NULL); | |
2788 | s->_raw_size += 4; | |
2789 | ||
2790 | /* We also need to make an entry in the .rel.plt section. */ | |
2791 | ||
2792 | s = bfd_get_section_by_name (dynobj, ".rel.plt"); | |
2793 | BFD_ASSERT (s != NULL); | |
2794 | s->_raw_size += sizeof (Elf32_External_Rel); | |
2795 | ||
2796 | return true; | |
2797 | } | |
2798 | ||
2799 | /* If this is a weak symbol, and there is a real definition, the | |
2800 | processor independent code will have arranged for us to see the | |
2801 | real definition first, and we can just use the same value. */ | |
2802 | if (h->weakdef != NULL) | |
2803 | { | |
2804 | BFD_ASSERT (h->weakdef->root.type == bfd_link_hash_defined | |
2805 | || h->weakdef->root.type == bfd_link_hash_defweak); | |
2806 | h->root.u.def.section = h->weakdef->root.u.def.section; | |
2807 | h->root.u.def.value = h->weakdef->root.u.def.value; | |
2808 | return true; | |
2809 | } | |
2810 | ||
2811 | /* This is a reference to a symbol defined by a dynamic object which | |
2812 | is not a function. */ | |
2813 | ||
2814 | /* If we are creating a shared library, we must presume that the | |
2815 | only references to the symbol are via the global offset table. | |
2816 | For such cases we need not do anything here; the relocations will | |
2817 | be handled correctly by relocate_section. */ | |
2818 | if (info->shared) | |
2819 | return true; | |
2820 | ||
2821 | /* We must allocate the symbol in our .dynbss section, which will | |
2822 | become part of the .bss section of the executable. There will be | |
2823 | an entry for this symbol in the .dynsym section. The dynamic | |
2824 | object will contain position independent code, so all references | |
2825 | from the dynamic object to this symbol will go through the global | |
2826 | offset table. The dynamic linker will use the .dynsym entry to | |
2827 | determine the address it must put in the global offset table, so | |
2828 | both the dynamic object and the regular object will refer to the | |
2829 | same memory location for the variable. */ | |
252b5132 RH |
2830 | s = bfd_get_section_by_name (dynobj, ".dynbss"); |
2831 | BFD_ASSERT (s != NULL); | |
2832 | ||
2833 | /* We must generate a R_ARM_COPY reloc to tell the dynamic linker to | |
2834 | copy the initial value out of the dynamic object and into the | |
2835 | runtime process image. We need to remember the offset into the | |
2836 | .rel.bss section we are going to use. */ | |
2837 | if ((h->root.u.def.section->flags & SEC_ALLOC) != 0) | |
2838 | { | |
2839 | asection *srel; | |
2840 | ||
2841 | srel = bfd_get_section_by_name (dynobj, ".rel.bss"); | |
2842 | BFD_ASSERT (srel != NULL); | |
2843 | srel->_raw_size += sizeof (Elf32_External_Rel); | |
2844 | h->elf_link_hash_flags |= ELF_LINK_HASH_NEEDS_COPY; | |
2845 | } | |
2846 | ||
2847 | /* We need to figure out the alignment required for this symbol. I | |
2848 | have no idea how ELF linkers handle this. */ | |
2849 | power_of_two = bfd_log2 (h->size); | |
2850 | if (power_of_two > 3) | |
2851 | power_of_two = 3; | |
2852 | ||
2853 | /* Apply the required alignment. */ | |
2854 | s->_raw_size = BFD_ALIGN (s->_raw_size, | |
2855 | (bfd_size_type) (1 << power_of_two)); | |
2856 | if (power_of_two > bfd_get_section_alignment (dynobj, s)) | |
2857 | { | |
2858 | if (! bfd_set_section_alignment (dynobj, s, power_of_two)) | |
2859 | return false; | |
2860 | } | |
2861 | ||
2862 | /* Define the symbol as being at this point in the section. */ | |
2863 | h->root.u.def.section = s; | |
2864 | h->root.u.def.value = s->_raw_size; | |
2865 | ||
2866 | /* Increment the section size to make room for the symbol. */ | |
2867 | s->_raw_size += h->size; | |
2868 | ||
2869 | return true; | |
2870 | } | |
2871 | ||
2872 | /* Set the sizes of the dynamic sections. */ | |
2873 | ||
2874 | static boolean | |
2875 | elf32_arm_size_dynamic_sections (output_bfd, info) | |
2876 | bfd * output_bfd; | |
2877 | struct bfd_link_info * info; | |
2878 | { | |
2879 | bfd * dynobj; | |
2880 | asection * s; | |
2881 | boolean plt; | |
2882 | boolean relocs; | |
2883 | boolean reltext; | |
2884 | ||
2885 | dynobj = elf_hash_table (info)->dynobj; | |
2886 | BFD_ASSERT (dynobj != NULL); | |
2887 | ||
2888 | if (elf_hash_table (info)->dynamic_sections_created) | |
2889 | { | |
2890 | /* Set the contents of the .interp section to the interpreter. */ | |
2891 | if (! info->shared) | |
2892 | { | |
2893 | s = bfd_get_section_by_name (dynobj, ".interp"); | |
2894 | BFD_ASSERT (s != NULL); | |
2895 | s->_raw_size = sizeof ELF_DYNAMIC_INTERPRETER; | |
2896 | s->contents = (unsigned char *) ELF_DYNAMIC_INTERPRETER; | |
2897 | } | |
2898 | } | |
2899 | else | |
2900 | { | |
2901 | /* We may have created entries in the .rel.got section. | |
2902 | However, if we are not creating the dynamic sections, we will | |
2903 | not actually use these entries. Reset the size of .rel.got, | |
2904 | which will cause it to get stripped from the output file | |
2905 | below. */ | |
2906 | s = bfd_get_section_by_name (dynobj, ".rel.got"); | |
2907 | if (s != NULL) | |
2908 | s->_raw_size = 0; | |
2909 | } | |
2910 | ||
2911 | /* If this is a -Bsymbolic shared link, then we need to discard all | |
2912 | PC relative relocs against symbols defined in a regular object. | |
2913 | We allocated space for them in the check_relocs routine, but we | |
2914 | will not fill them in in the relocate_section routine. */ | |
2915 | if (info->shared && info->symbolic) | |
2916 | elf32_arm_link_hash_traverse (elf32_arm_hash_table (info), | |
2917 | elf32_arm_discard_copies, | |
2918 | (PTR) NULL); | |
2919 | ||
2920 | /* The check_relocs and adjust_dynamic_symbol entry points have | |
2921 | determined the sizes of the various dynamic sections. Allocate | |
2922 | memory for them. */ | |
2923 | plt = false; | |
2924 | relocs = false; | |
2925 | reltext = false; | |
2926 | for (s = dynobj->sections; s != NULL; s = s->next) | |
2927 | { | |
2928 | const char * name; | |
2929 | boolean strip; | |
2930 | ||
2931 | if ((s->flags & SEC_LINKER_CREATED) == 0) | |
2932 | continue; | |
2933 | ||
2934 | /* It's OK to base decisions on the section name, because none | |
2935 | of the dynobj section names depend upon the input files. */ | |
2936 | name = bfd_get_section_name (dynobj, s); | |
2937 | ||
2938 | strip = false; | |
2939 | ||
2940 | if (strcmp (name, ".plt") == 0) | |
2941 | { | |
2942 | if (s->_raw_size == 0) | |
2943 | { | |
2944 | /* Strip this section if we don't need it; see the | |
2945 | comment below. */ | |
2946 | strip = true; | |
2947 | } | |
2948 | else | |
2949 | { | |
2950 | /* Remember whether there is a PLT. */ | |
2951 | plt = true; | |
2952 | } | |
2953 | } | |
2954 | else if (strncmp (name, ".rel", 4) == 0) | |
2955 | { | |
2956 | if (s->_raw_size == 0) | |
2957 | { | |
2958 | /* If we don't need this section, strip it from the | |
2959 | output file. This is mostly to handle .rel.bss and | |
2960 | .rel.plt. We must create both sections in | |
2961 | create_dynamic_sections, because they must be created | |
2962 | before the linker maps input sections to output | |
2963 | sections. The linker does that before | |
2964 | adjust_dynamic_symbol is called, and it is that | |
2965 | function which decides whether anything needs to go | |
2966 | into these sections. */ | |
2967 | strip = true; | |
2968 | } | |
2969 | else | |
2970 | { | |
2971 | asection * target; | |
2972 | ||
2973 | /* Remember whether there are any reloc sections other | |
2974 | than .rel.plt. */ | |
2975 | if (strcmp (name, ".rel.plt") != 0) | |
2976 | { | |
2977 | const char *outname; | |
2978 | ||
2979 | relocs = true; | |
2980 | ||
2981 | /* If this relocation section applies to a read only | |
2982 | section, then we probably need a DT_TEXTREL | |
2983 | entry. The entries in the .rel.plt section | |
2984 | really apply to the .got section, which we | |
2985 | created ourselves and so know is not readonly. */ | |
2986 | outname = bfd_get_section_name (output_bfd, | |
2987 | s->output_section); | |
2988 | target = bfd_get_section_by_name (output_bfd, outname + 4); | |
9a5aca8c | 2989 | |
252b5132 RH |
2990 | if (target != NULL |
2991 | && (target->flags & SEC_READONLY) != 0 | |
2992 | && (target->flags & SEC_ALLOC) != 0) | |
2993 | reltext = true; | |
2994 | } | |
2995 | ||
2996 | /* We use the reloc_count field as a counter if we need | |
2997 | to copy relocs into the output file. */ | |
2998 | s->reloc_count = 0; | |
2999 | } | |
3000 | } | |
3001 | else if (strncmp (name, ".got", 4) != 0) | |
3002 | { | |
3003 | /* It's not one of our sections, so don't allocate space. */ | |
3004 | continue; | |
3005 | } | |
3006 | ||
3007 | if (strip) | |
3008 | { | |
3009 | asection ** spp; | |
3010 | ||
3011 | for (spp = &s->output_section->owner->sections; | |
3012 | *spp != s->output_section; | |
3013 | spp = &(*spp)->next) | |
3014 | ; | |
3015 | *spp = s->output_section->next; | |
3016 | --s->output_section->owner->section_count; | |
3017 | ||
3018 | continue; | |
3019 | } | |
3020 | ||
3021 | /* Allocate memory for the section contents. */ | |
3022 | s->contents = (bfd_byte *) bfd_zalloc (dynobj, s->_raw_size); | |
3023 | if (s->contents == NULL && s->_raw_size != 0) | |
3024 | return false; | |
3025 | } | |
3026 | ||
3027 | if (elf_hash_table (info)->dynamic_sections_created) | |
3028 | { | |
3029 | /* Add some entries to the .dynamic section. We fill in the | |
3030 | values later, in elf32_arm_finish_dynamic_sections, but we | |
3031 | must add the entries now so that we get the correct size for | |
3032 | the .dynamic section. The DT_DEBUG entry is filled in by the | |
3033 | dynamic linker and used by the debugger. */ | |
3034 | if (! info->shared) | |
3035 | { | |
3036 | if (! bfd_elf32_add_dynamic_entry (info, DT_DEBUG, 0)) | |
3037 | return false; | |
3038 | } | |
3039 | ||
3040 | if (plt) | |
3041 | { | |
9b485d32 | 3042 | if ( ! bfd_elf32_add_dynamic_entry (info, DT_PLTGOT, 0) |
252b5132 RH |
3043 | || ! bfd_elf32_add_dynamic_entry (info, DT_PLTRELSZ, 0) |
3044 | || ! bfd_elf32_add_dynamic_entry (info, DT_PLTREL, DT_REL) | |
3045 | || ! bfd_elf32_add_dynamic_entry (info, DT_JMPREL, 0)) | |
3046 | return false; | |
3047 | } | |
3048 | ||
3049 | if (relocs) | |
3050 | { | |
9b485d32 | 3051 | if ( ! bfd_elf32_add_dynamic_entry (info, DT_REL, 0) |
252b5132 RH |
3052 | || ! bfd_elf32_add_dynamic_entry (info, DT_RELSZ, 0) |
3053 | || ! bfd_elf32_add_dynamic_entry (info, DT_RELENT, | |
3054 | sizeof (Elf32_External_Rel))) | |
3055 | return false; | |
3056 | } | |
3057 | ||
3058 | if (reltext) | |
3059 | { | |
3060 | if (! bfd_elf32_add_dynamic_entry (info, DT_TEXTREL, 0)) | |
3061 | return false; | |
d6cf2879 | 3062 | info->flags |= DF_TEXTREL; |
252b5132 RH |
3063 | } |
3064 | } | |
3065 | ||
3066 | return true; | |
3067 | } | |
3068 | ||
3069 | /* This function is called via elf32_arm_link_hash_traverse if we are | |
3070 | creating a shared object with -Bsymbolic. It discards the space | |
3071 | allocated to copy PC relative relocs against symbols which are | |
3072 | defined in regular objects. We allocated space for them in the | |
3073 | check_relocs routine, but we won't fill them in in the | |
3074 | relocate_section routine. */ | |
3075 | ||
3076 | static boolean | |
3077 | elf32_arm_discard_copies (h, ignore) | |
3078 | struct elf32_arm_link_hash_entry * h; | |
5f771d47 | 3079 | PTR ignore ATTRIBUTE_UNUSED; |
252b5132 RH |
3080 | { |
3081 | struct elf32_arm_pcrel_relocs_copied * s; | |
3082 | ||
3083 | /* We only discard relocs for symbols defined in a regular object. */ | |
3084 | if ((h->root.elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR) == 0) | |
3085 | return true; | |
3086 | ||
3087 | for (s = h->pcrel_relocs_copied; s != NULL; s = s->next) | |
3088 | s->section->_raw_size -= s->count * sizeof (Elf32_External_Rel); | |
3089 | ||
3090 | return true; | |
3091 | } | |
3092 | ||
3093 | /* Finish up dynamic symbol handling. We set the contents of various | |
3094 | dynamic sections here. */ | |
3095 | ||
3096 | static boolean | |
3097 | elf32_arm_finish_dynamic_symbol (output_bfd, info, h, sym) | |
3098 | bfd * output_bfd; | |
3099 | struct bfd_link_info * info; | |
3100 | struct elf_link_hash_entry * h; | |
3101 | Elf_Internal_Sym * sym; | |
3102 | { | |
3103 | bfd * dynobj; | |
3104 | ||
3105 | dynobj = elf_hash_table (info)->dynobj; | |
3106 | ||
3107 | if (h->plt.offset != (bfd_vma) -1) | |
3108 | { | |
3109 | asection * splt; | |
3110 | asection * sgot; | |
3111 | asection * srel; | |
3112 | bfd_vma plt_index; | |
3113 | bfd_vma got_offset; | |
3114 | Elf_Internal_Rel rel; | |
3115 | ||
3116 | /* This symbol has an entry in the procedure linkage table. Set | |
3117 | it up. */ | |
3118 | ||
3119 | BFD_ASSERT (h->dynindx != -1); | |
3120 | ||
3121 | splt = bfd_get_section_by_name (dynobj, ".plt"); | |
3122 | sgot = bfd_get_section_by_name (dynobj, ".got.plt"); | |
3123 | srel = bfd_get_section_by_name (dynobj, ".rel.plt"); | |
3124 | BFD_ASSERT (splt != NULL && sgot != NULL && srel != NULL); | |
3125 | ||
3126 | /* Get the index in the procedure linkage table which | |
3127 | corresponds to this symbol. This is the index of this symbol | |
3128 | in all the symbols for which we are making plt entries. The | |
3129 | first entry in the procedure linkage table is reserved. */ | |
3130 | plt_index = h->plt.offset / PLT_ENTRY_SIZE - 1; | |
3131 | ||
3132 | /* Get the offset into the .got table of the entry that | |
3133 | corresponds to this function. Each .got entry is 4 bytes. | |
3134 | The first three are reserved. */ | |
3135 | got_offset = (plt_index + 3) * 4; | |
3136 | ||
3137 | /* Fill in the entry in the procedure linkage table. */ | |
3138 | memcpy (splt->contents + h->plt.offset, | |
3139 | elf32_arm_plt_entry, | |
3140 | PLT_ENTRY_SIZE); | |
3141 | bfd_put_32 (output_bfd, | |
3142 | (sgot->output_section->vma | |
3143 | + sgot->output_offset | |
f21f3fe0 | 3144 | + got_offset |
252b5132 RH |
3145 | - splt->output_section->vma |
3146 | - splt->output_offset | |
3147 | - h->plt.offset - 12), | |
3148 | splt->contents + h->plt.offset + 12); | |
3149 | ||
3150 | /* Fill in the entry in the global offset table. */ | |
3151 | bfd_put_32 (output_bfd, | |
3152 | (splt->output_section->vma | |
3153 | + splt->output_offset), | |
3154 | sgot->contents + got_offset); | |
3155 | ||
3156 | /* Fill in the entry in the .rel.plt section. */ | |
3157 | rel.r_offset = (sgot->output_section->vma | |
3158 | + sgot->output_offset | |
3159 | + got_offset); | |
3160 | rel.r_info = ELF32_R_INFO (h->dynindx, R_ARM_JUMP_SLOT); | |
3161 | bfd_elf32_swap_reloc_out (output_bfd, &rel, | |
3162 | ((Elf32_External_Rel *) srel->contents | |
3163 | + plt_index)); | |
3164 | ||
3165 | if ((h->elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR) == 0) | |
3166 | { | |
3167 | /* Mark the symbol as undefined, rather than as defined in | |
3168 | the .plt section. Leave the value alone. */ | |
3169 | sym->st_shndx = SHN_UNDEF; | |
3170 | } | |
3171 | } | |
3172 | ||
3173 | if (h->got.offset != (bfd_vma) -1) | |
3174 | { | |
3175 | asection * sgot; | |
3176 | asection * srel; | |
3177 | Elf_Internal_Rel rel; | |
3178 | ||
3179 | /* This symbol has an entry in the global offset table. Set it | |
3180 | up. */ | |
252b5132 RH |
3181 | sgot = bfd_get_section_by_name (dynobj, ".got"); |
3182 | srel = bfd_get_section_by_name (dynobj, ".rel.got"); | |
3183 | BFD_ASSERT (sgot != NULL && srel != NULL); | |
3184 | ||
3185 | rel.r_offset = (sgot->output_section->vma | |
3186 | + sgot->output_offset | |
3187 | + (h->got.offset &~ 1)); | |
3188 | ||
3189 | /* If this is a -Bsymbolic link, and the symbol is defined | |
3190 | locally, we just want to emit a RELATIVE reloc. The entry in | |
3191 | the global offset table will already have been initialized in | |
3192 | the relocate_section function. */ | |
3193 | if (info->shared | |
3194 | && (info->symbolic || h->dynindx == -1) | |
3195 | && (h->elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR)) | |
3196 | rel.r_info = ELF32_R_INFO (0, R_ARM_RELATIVE); | |
3197 | else | |
3198 | { | |
3199 | bfd_put_32 (output_bfd, (bfd_vma) 0, sgot->contents + h->got.offset); | |
3200 | rel.r_info = ELF32_R_INFO (h->dynindx, R_ARM_GLOB_DAT); | |
3201 | } | |
3202 | ||
3203 | bfd_elf32_swap_reloc_out (output_bfd, &rel, | |
3204 | ((Elf32_External_Rel *) srel->contents | |
3205 | + srel->reloc_count)); | |
3206 | ++srel->reloc_count; | |
3207 | } | |
3208 | ||
3209 | if ((h->elf_link_hash_flags & ELF_LINK_HASH_NEEDS_COPY) != 0) | |
3210 | { | |
3211 | asection * s; | |
3212 | Elf_Internal_Rel rel; | |
3213 | ||
3214 | /* This symbol needs a copy reloc. Set it up. */ | |
252b5132 RH |
3215 | BFD_ASSERT (h->dynindx != -1 |
3216 | && (h->root.type == bfd_link_hash_defined | |
3217 | || h->root.type == bfd_link_hash_defweak)); | |
3218 | ||
3219 | s = bfd_get_section_by_name (h->root.u.def.section->owner, | |
3220 | ".rel.bss"); | |
3221 | BFD_ASSERT (s != NULL); | |
3222 | ||
3223 | rel.r_offset = (h->root.u.def.value | |
3224 | + h->root.u.def.section->output_section->vma | |
3225 | + h->root.u.def.section->output_offset); | |
3226 | rel.r_info = ELF32_R_INFO (h->dynindx, R_ARM_COPY); | |
3227 | bfd_elf32_swap_reloc_out (output_bfd, &rel, | |
3228 | ((Elf32_External_Rel *) s->contents | |
3229 | + s->reloc_count)); | |
3230 | ++s->reloc_count; | |
3231 | } | |
3232 | ||
3233 | /* Mark _DYNAMIC and _GLOBAL_OFFSET_TABLE_ as absolute. */ | |
3234 | if (strcmp (h->root.root.string, "_DYNAMIC") == 0 | |
3235 | || strcmp (h->root.root.string, "_GLOBAL_OFFSET_TABLE_") == 0) | |
3236 | sym->st_shndx = SHN_ABS; | |
3237 | ||
3238 | return true; | |
3239 | } | |
3240 | ||
3241 | /* Finish up the dynamic sections. */ | |
3242 | ||
3243 | static boolean | |
3244 | elf32_arm_finish_dynamic_sections (output_bfd, info) | |
3245 | bfd * output_bfd; | |
3246 | struct bfd_link_info * info; | |
3247 | { | |
3248 | bfd * dynobj; | |
3249 | asection * sgot; | |
3250 | asection * sdyn; | |
3251 | ||
3252 | dynobj = elf_hash_table (info)->dynobj; | |
3253 | ||
3254 | sgot = bfd_get_section_by_name (dynobj, ".got.plt"); | |
3255 | BFD_ASSERT (sgot != NULL); | |
3256 | sdyn = bfd_get_section_by_name (dynobj, ".dynamic"); | |
3257 | ||
3258 | if (elf_hash_table (info)->dynamic_sections_created) | |
3259 | { | |
3260 | asection *splt; | |
3261 | Elf32_External_Dyn *dyncon, *dynconend; | |
3262 | ||
3263 | splt = bfd_get_section_by_name (dynobj, ".plt"); | |
3264 | BFD_ASSERT (splt != NULL && sdyn != NULL); | |
3265 | ||
3266 | dyncon = (Elf32_External_Dyn *) sdyn->contents; | |
3267 | dynconend = (Elf32_External_Dyn *) (sdyn->contents + sdyn->_raw_size); | |
9b485d32 | 3268 | |
252b5132 RH |
3269 | for (; dyncon < dynconend; dyncon++) |
3270 | { | |
3271 | Elf_Internal_Dyn dyn; | |
3272 | const char * name; | |
3273 | asection * s; | |
3274 | ||
3275 | bfd_elf32_swap_dyn_in (dynobj, dyncon, &dyn); | |
3276 | ||
3277 | switch (dyn.d_tag) | |
3278 | { | |
3279 | default: | |
3280 | break; | |
3281 | ||
3282 | case DT_PLTGOT: | |
3283 | name = ".got"; | |
3284 | goto get_vma; | |
3285 | case DT_JMPREL: | |
3286 | name = ".rel.plt"; | |
3287 | get_vma: | |
3288 | s = bfd_get_section_by_name (output_bfd, name); | |
3289 | BFD_ASSERT (s != NULL); | |
3290 | dyn.d_un.d_ptr = s->vma; | |
3291 | bfd_elf32_swap_dyn_out (output_bfd, &dyn, dyncon); | |
3292 | break; | |
3293 | ||
3294 | case DT_PLTRELSZ: | |
3295 | s = bfd_get_section_by_name (output_bfd, ".rel.plt"); | |
3296 | BFD_ASSERT (s != NULL); | |
3297 | if (s->_cooked_size != 0) | |
3298 | dyn.d_un.d_val = s->_cooked_size; | |
3299 | else | |
3300 | dyn.d_un.d_val = s->_raw_size; | |
3301 | bfd_elf32_swap_dyn_out (output_bfd, &dyn, dyncon); | |
3302 | break; | |
3303 | ||
3304 | case DT_RELSZ: | |
3305 | /* My reading of the SVR4 ABI indicates that the | |
3306 | procedure linkage table relocs (DT_JMPREL) should be | |
3307 | included in the overall relocs (DT_REL). This is | |
3308 | what Solaris does. However, UnixWare can not handle | |
3309 | that case. Therefore, we override the DT_RELSZ entry | |
3310 | here to make it not include the JMPREL relocs. Since | |
3311 | the linker script arranges for .rel.plt to follow all | |
3312 | other relocation sections, we don't have to worry | |
3313 | about changing the DT_REL entry. */ | |
3314 | s = bfd_get_section_by_name (output_bfd, ".rel.plt"); | |
3315 | if (s != NULL) | |
3316 | { | |
3317 | if (s->_cooked_size != 0) | |
3318 | dyn.d_un.d_val -= s->_cooked_size; | |
3319 | else | |
3320 | dyn.d_un.d_val -= s->_raw_size; | |
3321 | } | |
3322 | bfd_elf32_swap_dyn_out (output_bfd, &dyn, dyncon); | |
3323 | break; | |
3324 | } | |
3325 | } | |
3326 | ||
3327 | /* Fill in the first entry in the procedure linkage table. */ | |
3328 | if (splt->_raw_size > 0) | |
3329 | memcpy (splt->contents, elf32_arm_plt0_entry, PLT_ENTRY_SIZE); | |
3330 | ||
3331 | /* UnixWare sets the entsize of .plt to 4, although that doesn't | |
3332 | really seem like the right value. */ | |
3333 | elf_section_data (splt->output_section)->this_hdr.sh_entsize = 4; | |
3334 | } | |
3335 | ||
3336 | /* Fill in the first three entries in the global offset table. */ | |
3337 | if (sgot->_raw_size > 0) | |
3338 | { | |
3339 | if (sdyn == NULL) | |
3340 | bfd_put_32 (output_bfd, (bfd_vma) 0, sgot->contents); | |
3341 | else | |
3342 | bfd_put_32 (output_bfd, | |
3343 | sdyn->output_section->vma + sdyn->output_offset, | |
3344 | sgot->contents); | |
3345 | bfd_put_32 (output_bfd, (bfd_vma) 0, sgot->contents + 4); | |
3346 | bfd_put_32 (output_bfd, (bfd_vma) 0, sgot->contents + 8); | |
3347 | } | |
3348 | ||
3349 | elf_section_data (sgot->output_section)->this_hdr.sh_entsize = 4; | |
3350 | ||
3351 | return true; | |
3352 | } | |
3353 | ||
ba96a88f NC |
3354 | static void |
3355 | elf32_arm_post_process_headers (abfd, link_info) | |
3356 | bfd * abfd; | |
5f771d47 | 3357 | struct bfd_link_info * link_info ATTRIBUTE_UNUSED; |
ba96a88f | 3358 | { |
9b485d32 | 3359 | Elf_Internal_Ehdr * i_ehdrp; /* ELF file header, internal form. */ |
ba96a88f NC |
3360 | |
3361 | i_ehdrp = elf_elfheader (abfd); | |
3362 | ||
3363 | i_ehdrp->e_ident[EI_OSABI] = ARM_ELF_OS_ABI_VERSION; | |
3364 | i_ehdrp->e_ident[EI_ABIVERSION] = ARM_ELF_ABI_VERSION; | |
3365 | } | |
3366 | ||
252b5132 RH |
3367 | #define ELF_ARCH bfd_arch_arm |
3368 | #define ELF_MACHINE_CODE EM_ARM | |
f21f3fe0 | 3369 | #define ELF_MAXPAGESIZE 0x8000 |
252b5132 | 3370 | |
252b5132 RH |
3371 | #define bfd_elf32_bfd_copy_private_bfd_data elf32_arm_copy_private_bfd_data |
3372 | #define bfd_elf32_bfd_merge_private_bfd_data elf32_arm_merge_private_bfd_data | |
3373 | #define bfd_elf32_bfd_set_private_flags elf32_arm_set_private_flags | |
3374 | #define bfd_elf32_bfd_print_private_bfd_data elf32_arm_print_private_bfd_data | |
3375 | #define bfd_elf32_bfd_link_hash_table_create elf32_arm_link_hash_table_create | |
3376 | #define bfd_elf32_bfd_reloc_type_lookup elf32_arm_reloc_type_lookup | |
3377 | #define bfd_elf32_find_nearest_line elf32_arm_find_nearest_line | |
3378 | ||
3379 | #define elf_backend_get_symbol_type elf32_arm_get_symbol_type | |
3380 | #define elf_backend_gc_mark_hook elf32_arm_gc_mark_hook | |
3381 | #define elf_backend_gc_sweep_hook elf32_arm_gc_sweep_hook | |
3382 | #define elf_backend_check_relocs elf32_arm_check_relocs | |
3383 | #define elf_backend_relocate_section elf32_arm_relocate_section | |
3384 | #define elf_backend_adjust_dynamic_symbol elf32_arm_adjust_dynamic_symbol | |
3385 | #define elf_backend_create_dynamic_sections _bfd_elf_create_dynamic_sections | |
3386 | #define elf_backend_finish_dynamic_symbol elf32_arm_finish_dynamic_symbol | |
3387 | #define elf_backend_finish_dynamic_sections elf32_arm_finish_dynamic_sections | |
3388 | #define elf_backend_size_dynamic_sections elf32_arm_size_dynamic_sections | |
ba96a88f | 3389 | #define elf_backend_post_process_headers elf32_arm_post_process_headers |
252b5132 RH |
3390 | |
3391 | #define elf_backend_can_gc_sections 1 | |
3392 | #define elf_backend_plt_readonly 1 | |
3393 | #define elf_backend_want_got_plt 1 | |
3394 | #define elf_backend_want_plt_sym 0 | |
3395 | ||
04f7c78d NC |
3396 | #define elf_backend_got_header_size 12 |
3397 | #define elf_backend_plt_header_size PLT_ENTRY_SIZE | |
3398 | ||
252b5132 | 3399 | #include "elf32-target.h" |