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252b5132 | 1 | /* 32-bit ELF support for ARM |
7898deda | 2 | Copyright 1998, 1999, 2000, 2001 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 | |
fd2ec330 | 58 | #define INTERWORK_FLAG(abfd) (elf_elfheader (abfd)->e_flags & EF_ARM_INTERWORK) |
9b485d32 | 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 | ||
df425bc0 | 1437 | #ifndef OLD_ARM_ABI |
4f3c3dbb NC |
1438 | if (r_type == R_ARM_THM_XPC22 |
1439 | && ((lower_insn & 0x1800) == 0x0800)) | |
1440 | /* Remove bit zero of the adjusted offset. Bit zero can only be | |
1441 | set if the upper insn is at a half-word boundary, since the | |
1442 | destination address, an ARM instruction, must always be on a | |
1443 | word boundary. The semantics of the BLX (1) instruction, however, | |
1444 | are that bit zero in the offset must always be zero, and the | |
1445 | corresponding bit one in the target address will be set from bit | |
1446 | one of the source address. */ | |
1447 | lower_insn &= ~1; | |
df425bc0 | 1448 | #endif |
252b5132 RH |
1449 | /* Put the relocated value back in the object file: */ |
1450 | bfd_put_16 (input_bfd, upper_insn, hit_data); | |
1451 | bfd_put_16 (input_bfd, lower_insn, hit_data + 2); | |
1452 | ||
1453 | return (overflow ? bfd_reloc_overflow : bfd_reloc_ok); | |
1454 | } | |
1455 | break; | |
1456 | ||
1457 | case R_ARM_GNU_VTINHERIT: | |
1458 | case R_ARM_GNU_VTENTRY: | |
1459 | return bfd_reloc_ok; | |
1460 | ||
1461 | case R_ARM_COPY: | |
1462 | return bfd_reloc_notsupported; | |
1463 | ||
1464 | case R_ARM_GLOB_DAT: | |
1465 | return bfd_reloc_notsupported; | |
1466 | ||
1467 | case R_ARM_JUMP_SLOT: | |
1468 | return bfd_reloc_notsupported; | |
1469 | ||
1470 | case R_ARM_RELATIVE: | |
1471 | return bfd_reloc_notsupported; | |
1472 | ||
1473 | case R_ARM_GOTOFF: | |
1474 | /* Relocation is relative to the start of the | |
1475 | global offset table. */ | |
1476 | ||
1477 | BFD_ASSERT (sgot != NULL); | |
1478 | if (sgot == NULL) | |
1479 | return bfd_reloc_notsupported; | |
9a5aca8c | 1480 | |
252b5132 RH |
1481 | /* Note that sgot->output_offset is not involved in this |
1482 | calculation. We always want the start of .got. If we | |
1483 | define _GLOBAL_OFFSET_TABLE in a different way, as is | |
1484 | permitted by the ABI, we might have to change this | |
9b485d32 | 1485 | calculation. */ |
252b5132 | 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); | |
1490 | ||
1491 | case R_ARM_GOTPC: | |
a7c10850 | 1492 | /* Use global offset table as symbol value. */ |
252b5132 | 1493 | BFD_ASSERT (sgot != NULL); |
f21f3fe0 | 1494 | |
252b5132 RH |
1495 | if (sgot == NULL) |
1496 | return bfd_reloc_notsupported; | |
1497 | ||
1498 | value = sgot->output_section->vma; | |
f21f3fe0 | 1499 | return _bfd_final_link_relocate (howto, input_bfd, input_section, |
252b5132 RH |
1500 | contents, rel->r_offset, value, |
1501 | (bfd_vma) 0); | |
f21f3fe0 | 1502 | |
252b5132 RH |
1503 | case R_ARM_GOT32: |
1504 | /* Relocation is to the entry for this symbol in the | |
9b485d32 | 1505 | global offset table. */ |
252b5132 RH |
1506 | if (sgot == NULL) |
1507 | return bfd_reloc_notsupported; | |
f21f3fe0 | 1508 | |
252b5132 RH |
1509 | if (h != NULL) |
1510 | { | |
1511 | bfd_vma off; | |
f21f3fe0 | 1512 | |
252b5132 RH |
1513 | off = h->got.offset; |
1514 | BFD_ASSERT (off != (bfd_vma) -1); | |
f21f3fe0 | 1515 | |
252b5132 RH |
1516 | if (!elf_hash_table (info)->dynamic_sections_created || |
1517 | (info->shared && (info->symbolic || h->dynindx == -1) | |
1518 | && (h->elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR))) | |
1519 | { | |
1520 | /* This is actually a static link, or it is a -Bsymbolic link | |
1521 | and the symbol is defined locally. We must initialize this | |
1522 | entry in the global offset table. Since the offset must | |
1523 | always be a multiple of 4, we use the least significant bit | |
1524 | to record whether we have initialized it already. | |
f21f3fe0 | 1525 | |
252b5132 | 1526 | When doing a dynamic link, we create a .rel.got relocation |
f21f3fe0 | 1527 | entry to initialize the value. This is done in the |
9b485d32 | 1528 | finish_dynamic_symbol routine. */ |
252b5132 RH |
1529 | if ((off & 1) != 0) |
1530 | off &= ~1; | |
1531 | else | |
1532 | { | |
1533 | bfd_put_32 (output_bfd, value, sgot->contents + off); | |
1534 | h->got.offset |= 1; | |
1535 | } | |
1536 | } | |
f21f3fe0 | 1537 | |
252b5132 RH |
1538 | value = sgot->output_offset + off; |
1539 | } | |
1540 | else | |
1541 | { | |
1542 | bfd_vma off; | |
f21f3fe0 | 1543 | |
252b5132 RH |
1544 | BFD_ASSERT (local_got_offsets != NULL && |
1545 | local_got_offsets[r_symndx] != (bfd_vma) -1); | |
f21f3fe0 | 1546 | |
252b5132 | 1547 | off = local_got_offsets[r_symndx]; |
f21f3fe0 | 1548 | |
252b5132 RH |
1549 | /* The offset must always be a multiple of 4. We use the |
1550 | least significant bit to record whether we have already | |
9b485d32 | 1551 | generated the necessary reloc. */ |
252b5132 RH |
1552 | if ((off & 1) != 0) |
1553 | off &= ~1; | |
1554 | else | |
1555 | { | |
1556 | bfd_put_32 (output_bfd, value, sgot->contents + off); | |
f21f3fe0 | 1557 | |
252b5132 RH |
1558 | if (info->shared) |
1559 | { | |
1560 | asection * srelgot; | |
1561 | Elf_Internal_Rel outrel; | |
f21f3fe0 | 1562 | |
252b5132 RH |
1563 | srelgot = bfd_get_section_by_name (dynobj, ".rel.got"); |
1564 | BFD_ASSERT (srelgot != NULL); | |
f21f3fe0 | 1565 | |
252b5132 | 1566 | outrel.r_offset = (sgot->output_section->vma |
f21f3fe0 | 1567 | + sgot->output_offset |
252b5132 RH |
1568 | + off); |
1569 | outrel.r_info = ELF32_R_INFO (0, R_ARM_RELATIVE); | |
1570 | bfd_elf32_swap_reloc_out (output_bfd, &outrel, | |
1571 | (((Elf32_External_Rel *) | |
1572 | srelgot->contents) | |
1573 | + srelgot->reloc_count)); | |
1574 | ++srelgot->reloc_count; | |
1575 | } | |
f21f3fe0 | 1576 | |
252b5132 RH |
1577 | local_got_offsets[r_symndx] |= 1; |
1578 | } | |
f21f3fe0 | 1579 | |
252b5132 RH |
1580 | value = sgot->output_offset + off; |
1581 | } | |
9a5aca8c | 1582 | |
f21f3fe0 | 1583 | return _bfd_final_link_relocate (howto, input_bfd, input_section, |
252b5132 RH |
1584 | contents, rel->r_offset, value, |
1585 | (bfd_vma) 0); | |
f21f3fe0 | 1586 | |
252b5132 RH |
1587 | case R_ARM_PLT32: |
1588 | /* Relocation is to the entry for this symbol in the | |
1589 | procedure linkage table. */ | |
1590 | ||
1591 | /* Resolve a PLT32 reloc against a local symbol directly, | |
9b485d32 | 1592 | without using the procedure linkage table. */ |
252b5132 RH |
1593 | if (h == NULL) |
1594 | return _bfd_final_link_relocate (howto, input_bfd, input_section, | |
1595 | contents, rel->r_offset, value, | |
1596 | (bfd_vma) 0); | |
1597 | ||
1598 | if (h->plt.offset == (bfd_vma) -1) | |
1599 | /* We didn't make a PLT entry for this symbol. This | |
1600 | happens when statically linking PIC code, or when | |
1601 | using -Bsymbolic. */ | |
1602 | return _bfd_final_link_relocate (howto, input_bfd, input_section, | |
1603 | contents, rel->r_offset, value, | |
1604 | (bfd_vma) 0); | |
1605 | ||
1606 | BFD_ASSERT(splt != NULL); | |
1607 | if (splt == NULL) | |
1608 | return bfd_reloc_notsupported; | |
1609 | ||
1610 | value = (splt->output_section->vma | |
1611 | + splt->output_offset | |
1612 | + h->plt.offset); | |
1613 | return _bfd_final_link_relocate (howto, input_bfd, input_section, | |
1614 | contents, rel->r_offset, value, | |
1615 | (bfd_vma) 0); | |
f21f3fe0 | 1616 | |
252b5132 RH |
1617 | case R_ARM_SBREL32: |
1618 | return bfd_reloc_notsupported; | |
1619 | ||
1620 | case R_ARM_AMP_VCALL9: | |
1621 | return bfd_reloc_notsupported; | |
1622 | ||
1623 | case R_ARM_RSBREL32: | |
1624 | return bfd_reloc_notsupported; | |
1625 | ||
1626 | case R_ARM_THM_RPC22: | |
1627 | return bfd_reloc_notsupported; | |
1628 | ||
1629 | case R_ARM_RREL32: | |
1630 | return bfd_reloc_notsupported; | |
1631 | ||
1632 | case R_ARM_RABS32: | |
1633 | return bfd_reloc_notsupported; | |
1634 | ||
1635 | case R_ARM_RPC24: | |
1636 | return bfd_reloc_notsupported; | |
1637 | ||
1638 | case R_ARM_RBASE: | |
1639 | return bfd_reloc_notsupported; | |
1640 | ||
1641 | default: | |
1642 | return bfd_reloc_notsupported; | |
1643 | } | |
1644 | } | |
1645 | ||
98c1d4aa NC |
1646 | #ifdef USE_REL |
1647 | /* Add INCREMENT to the reloc (of type HOWTO) at ADDRESS. */ | |
1648 | static void | |
1649 | arm_add_to_rel (abfd, address, howto, increment) | |
1650 | bfd * abfd; | |
59f2c4e7 | 1651 | bfd_byte * address; |
98c1d4aa NC |
1652 | reloc_howto_type * howto; |
1653 | bfd_signed_vma increment; | |
1654 | { | |
98c1d4aa NC |
1655 | bfd_signed_vma addend; |
1656 | ||
9a5aca8c | 1657 | if (howto->type == R_ARM_THM_PC22) |
98c1d4aa | 1658 | { |
9a5aca8c AM |
1659 | int upper_insn, lower_insn; |
1660 | int upper, lower; | |
98c1d4aa | 1661 | |
9a5aca8c AM |
1662 | upper_insn = bfd_get_16 (abfd, address); |
1663 | lower_insn = bfd_get_16 (abfd, address + 2); | |
1664 | upper = upper_insn & 0x7ff; | |
1665 | lower = lower_insn & 0x7ff; | |
1666 | ||
1667 | addend = (upper << 12) | (lower << 1); | |
ddda4409 | 1668 | addend += increment; |
9a5aca8c | 1669 | addend >>= 1; |
98c1d4aa | 1670 | |
9a5aca8c AM |
1671 | upper_insn = (upper_insn & 0xf800) | ((addend >> 11) & 0x7ff); |
1672 | lower_insn = (lower_insn & 0xf800) | (addend & 0x7ff); | |
1673 | ||
1674 | bfd_put_16 (abfd, upper_insn, address); | |
1675 | bfd_put_16 (abfd, lower_insn, address + 2); | |
1676 | } | |
1677 | else | |
1678 | { | |
1679 | bfd_vma contents; | |
1680 | ||
1681 | contents = bfd_get_32 (abfd, address); | |
1682 | ||
1683 | /* Get the (signed) value from the instruction. */ | |
1684 | addend = contents & howto->src_mask; | |
1685 | if (addend & ((howto->src_mask + 1) >> 1)) | |
1686 | { | |
1687 | bfd_signed_vma mask; | |
1688 | ||
1689 | mask = -1; | |
1690 | mask &= ~ howto->src_mask; | |
1691 | addend |= mask; | |
1692 | } | |
1693 | ||
1694 | /* Add in the increment, (which is a byte value). */ | |
1695 | switch (howto->type) | |
1696 | { | |
1697 | default: | |
1698 | addend += increment; | |
1699 | break; | |
1700 | ||
1701 | case R_ARM_PC24: | |
1702 | addend <<= howto->size; | |
1703 | addend += increment; | |
1704 | ||
1705 | /* Should we check for overflow here ? */ | |
1706 | ||
1707 | /* Drop any undesired bits. */ | |
1708 | addend >>= howto->rightshift; | |
1709 | break; | |
1710 | } | |
1711 | ||
1712 | contents = (contents & ~ howto->dst_mask) | (addend & howto->dst_mask); | |
1713 | ||
1714 | bfd_put_32 (abfd, contents, address); | |
ddda4409 | 1715 | } |
98c1d4aa NC |
1716 | } |
1717 | #endif /* USE_REL */ | |
252b5132 RH |
1718 | |
1719 | /* Relocate an ARM ELF section. */ | |
1720 | static boolean | |
1721 | elf32_arm_relocate_section (output_bfd, info, input_bfd, input_section, | |
1722 | contents, relocs, local_syms, local_sections) | |
1723 | bfd * output_bfd; | |
1724 | struct bfd_link_info * info; | |
1725 | bfd * input_bfd; | |
1726 | asection * input_section; | |
1727 | bfd_byte * contents; | |
1728 | Elf_Internal_Rela * relocs; | |
1729 | Elf_Internal_Sym * local_syms; | |
1730 | asection ** local_sections; | |
1731 | { | |
1732 | Elf_Internal_Shdr * symtab_hdr; | |
1733 | struct elf_link_hash_entry ** sym_hashes; | |
1734 | Elf_Internal_Rela * rel; | |
1735 | Elf_Internal_Rela * relend; | |
1736 | const char * name; | |
1737 | ||
1738 | symtab_hdr = & elf_tdata (input_bfd)->symtab_hdr; | |
1739 | sym_hashes = elf_sym_hashes (input_bfd); | |
1740 | ||
1741 | rel = relocs; | |
1742 | relend = relocs + input_section->reloc_count; | |
1743 | for (; rel < relend; rel++) | |
1744 | { | |
ba96a88f NC |
1745 | int r_type; |
1746 | reloc_howto_type * howto; | |
1747 | unsigned long r_symndx; | |
1748 | Elf_Internal_Sym * sym; | |
1749 | asection * sec; | |
252b5132 | 1750 | struct elf_link_hash_entry * h; |
ba96a88f NC |
1751 | bfd_vma relocation; |
1752 | bfd_reloc_status_type r; | |
1753 | arelent bfd_reloc; | |
f21f3fe0 | 1754 | |
252b5132 | 1755 | r_symndx = ELF32_R_SYM (rel->r_info); |
ba96a88f | 1756 | r_type = ELF32_R_TYPE (rel->r_info); |
252b5132 | 1757 | |
ba96a88f NC |
1758 | if ( r_type == R_ARM_GNU_VTENTRY |
1759 | || r_type == R_ARM_GNU_VTINHERIT) | |
252b5132 RH |
1760 | continue; |
1761 | ||
ba96a88f NC |
1762 | elf32_arm_info_to_howto (input_bfd, & bfd_reloc, rel); |
1763 | howto = bfd_reloc.howto; | |
252b5132 RH |
1764 | |
1765 | if (info->relocateable) | |
1766 | { | |
1767 | /* This is a relocateable link. We don't have to change | |
1768 | anything, unless the reloc is against a section symbol, | |
1769 | in which case we have to adjust according to where the | |
1770 | section symbol winds up in the output section. */ | |
1771 | if (r_symndx < symtab_hdr->sh_info) | |
1772 | { | |
1773 | sym = local_syms + r_symndx; | |
1774 | if (ELF_ST_TYPE (sym->st_info) == STT_SECTION) | |
1775 | { | |
1776 | sec = local_sections[r_symndx]; | |
1777 | #ifdef USE_REL | |
98c1d4aa NC |
1778 | arm_add_to_rel (input_bfd, contents + rel->r_offset, |
1779 | howto, sec->output_offset + sym->st_value); | |
252b5132 RH |
1780 | #else |
1781 | rel->r_addend += (sec->output_offset + sym->st_value) | |
1782 | >> howto->rightshift; | |
1783 | #endif | |
1784 | } | |
1785 | } | |
1786 | ||
1787 | continue; | |
1788 | } | |
1789 | ||
1790 | /* This is a final link. */ | |
1791 | h = NULL; | |
1792 | sym = NULL; | |
1793 | sec = NULL; | |
9b485d32 | 1794 | |
252b5132 RH |
1795 | if (r_symndx < symtab_hdr->sh_info) |
1796 | { | |
1797 | sym = local_syms + r_symndx; | |
1798 | sec = local_sections[r_symndx]; | |
1799 | relocation = (sec->output_section->vma | |
1800 | + sec->output_offset | |
1801 | + sym->st_value); | |
1802 | } | |
1803 | else | |
1804 | { | |
1805 | h = sym_hashes[r_symndx - symtab_hdr->sh_info]; | |
9b485d32 NC |
1806 | |
1807 | while ( h->root.type == bfd_link_hash_indirect | |
252b5132 RH |
1808 | || h->root.type == bfd_link_hash_warning) |
1809 | h = (struct elf_link_hash_entry *) h->root.u.i.link; | |
9b485d32 NC |
1810 | |
1811 | if ( h->root.type == bfd_link_hash_defined | |
252b5132 RH |
1812 | || h->root.type == bfd_link_hash_defweak) |
1813 | { | |
780a67af | 1814 | int relocation_needed = 1; |
f21f3fe0 | 1815 | |
780a67af | 1816 | sec = h->root.u.def.section; |
f21f3fe0 | 1817 | |
252b5132 | 1818 | /* In these cases, we don't need the relocation value. |
f21f3fe0 | 1819 | We check specially because in some obscure cases |
9b485d32 | 1820 | sec->output_section will be NULL. */ |
252b5132 RH |
1821 | switch (r_type) |
1822 | { | |
1823 | case R_ARM_PC24: | |
1824 | case R_ARM_ABS32: | |
1825 | if (info->shared | |
1826 | && ( | |
1827 | (!info->symbolic && h->dynindx != -1) | |
97eaf9de | 1828 | || (h->elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR) == 0 |
252b5132 | 1829 | ) |
05924f36 PB |
1830 | && ((input_section->flags & SEC_ALLOC) != 0 |
1831 | /* DWARF will emit R_ARM_ABS32 relocations in its | |
1832 | sections against symbols defined externally | |
1833 | in shared libraries. We can't do anything | |
1834 | with them here. */ | |
1835 | || ((input_section->flags & SEC_DEBUGGING) != 0 | |
1836 | && (h->elf_link_hash_flags | |
1837 | & ELF_LINK_HASH_DEF_DYNAMIC) != 0)) | |
252b5132 | 1838 | ) |
780a67af | 1839 | relocation_needed = 0; |
252b5132 | 1840 | break; |
f21f3fe0 | 1841 | |
252b5132 | 1842 | case R_ARM_GOTPC: |
780a67af | 1843 | relocation_needed = 0; |
252b5132 | 1844 | break; |
f21f3fe0 | 1845 | |
252b5132 RH |
1846 | case R_ARM_GOT32: |
1847 | if (elf_hash_table(info)->dynamic_sections_created | |
1848 | && (!info->shared | |
1849 | || (!info->symbolic && h->dynindx != -1) | |
1850 | || (h->elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR) == 0 | |
1851 | ) | |
1852 | ) | |
780a67af | 1853 | relocation_needed = 0; |
252b5132 | 1854 | break; |
f21f3fe0 | 1855 | |
252b5132 RH |
1856 | case R_ARM_PLT32: |
1857 | if (h->plt.offset != (bfd_vma)-1) | |
780a67af | 1858 | relocation_needed = 0; |
252b5132 | 1859 | break; |
f21f3fe0 | 1860 | |
252b5132 RH |
1861 | default: |
1862 | if (sec->output_section == NULL) | |
1863 | { | |
1864 | (*_bfd_error_handler) | |
1865 | (_("%s: warning: unresolvable relocation against symbol `%s' from %s section"), | |
1866 | bfd_get_filename (input_bfd), h->root.root.string, | |
1867 | bfd_get_section_name (input_bfd, input_section)); | |
780a67af | 1868 | relocation_needed = 0; |
252b5132 RH |
1869 | } |
1870 | } | |
780a67af NC |
1871 | |
1872 | if (relocation_needed) | |
1873 | relocation = h->root.u.def.value | |
1874 | + sec->output_section->vma | |
1875 | + sec->output_offset; | |
1876 | else | |
1877 | relocation = 0; | |
252b5132 RH |
1878 | } |
1879 | else if (h->root.type == bfd_link_hash_undefweak) | |
1880 | relocation = 0; | |
3a27a730 L |
1881 | else if (info->shared && !info->symbolic |
1882 | && !info->no_undefined | |
1883 | && ELF_ST_VISIBILITY (h->other) == STV_DEFAULT) | |
a72747a3 | 1884 | relocation = 0; |
252b5132 RH |
1885 | else |
1886 | { | |
1887 | if (!((*info->callbacks->undefined_symbol) | |
1888 | (info, h->root.root.string, input_bfd, | |
5cc7c785 | 1889 | input_section, rel->r_offset, |
3a27a730 L |
1890 | (!info->shared || info->no_undefined |
1891 | || ELF_ST_VISIBILITY (h->other))))) | |
252b5132 RH |
1892 | return false; |
1893 | relocation = 0; | |
1894 | } | |
1895 | } | |
1896 | ||
1897 | if (h != NULL) | |
1898 | name = h->root.root.string; | |
1899 | else | |
1900 | { | |
1901 | name = (bfd_elf_string_from_elf_section | |
1902 | (input_bfd, symtab_hdr->sh_link, sym->st_name)); | |
1903 | if (name == NULL || *name == '\0') | |
1904 | name = bfd_section_name (input_bfd, sec); | |
1905 | } | |
f21f3fe0 | 1906 | |
252b5132 RH |
1907 | r = elf32_arm_final_link_relocate (howto, input_bfd, output_bfd, |
1908 | input_section, contents, rel, | |
1909 | relocation, info, sec, name, | |
1910 | (h ? ELF_ST_TYPE (h->type) : | |
780a67af | 1911 | ELF_ST_TYPE (sym->st_info)), h); |
252b5132 RH |
1912 | |
1913 | if (r != bfd_reloc_ok) | |
1914 | { | |
1915 | const char * msg = (const char *) 0; | |
1916 | ||
1917 | switch (r) | |
1918 | { | |
1919 | case bfd_reloc_overflow: | |
cf919dfd PB |
1920 | /* If the overflowing reloc was to an undefined symbol, |
1921 | we have already printed one error message and there | |
1922 | is no point complaining again. */ | |
1923 | if ((! h || | |
1924 | h->root.type != bfd_link_hash_undefined) | |
1925 | && (!((*info->callbacks->reloc_overflow) | |
1926 | (info, name, howto->name, (bfd_vma) 0, | |
1927 | input_bfd, input_section, rel->r_offset)))) | |
1928 | return false; | |
252b5132 RH |
1929 | break; |
1930 | ||
1931 | case bfd_reloc_undefined: | |
1932 | if (!((*info->callbacks->undefined_symbol) | |
1933 | (info, name, input_bfd, input_section, | |
5cc7c785 | 1934 | rel->r_offset, true))) |
252b5132 RH |
1935 | return false; |
1936 | break; | |
1937 | ||
1938 | case bfd_reloc_outofrange: | |
9b485d32 | 1939 | msg = _("internal error: out of range error"); |
252b5132 RH |
1940 | goto common_error; |
1941 | ||
1942 | case bfd_reloc_notsupported: | |
9b485d32 | 1943 | msg = _("internal error: unsupported relocation error"); |
252b5132 RH |
1944 | goto common_error; |
1945 | ||
1946 | case bfd_reloc_dangerous: | |
9b485d32 | 1947 | msg = _("internal error: dangerous error"); |
252b5132 RH |
1948 | goto common_error; |
1949 | ||
1950 | default: | |
9b485d32 | 1951 | msg = _("internal error: unknown error"); |
252b5132 RH |
1952 | /* fall through */ |
1953 | ||
1954 | common_error: | |
1955 | if (!((*info->callbacks->warning) | |
1956 | (info, msg, name, input_bfd, input_section, | |
1957 | rel->r_offset))) | |
1958 | return false; | |
1959 | break; | |
1960 | } | |
1961 | } | |
1962 | } | |
1963 | ||
1964 | return true; | |
1965 | } | |
1966 | ||
fc830a83 | 1967 | /* Function to keep ARM specific flags in the ELF header. */ |
252b5132 RH |
1968 | static boolean |
1969 | elf32_arm_set_private_flags (abfd, flags) | |
1970 | bfd *abfd; | |
1971 | flagword flags; | |
1972 | { | |
1973 | if (elf_flags_init (abfd) | |
1974 | && elf_elfheader (abfd)->e_flags != flags) | |
1975 | { | |
fc830a83 NC |
1976 | if (EF_ARM_EABI_VERSION (flags) == EF_ARM_EABI_UNKNOWN) |
1977 | { | |
fd2ec330 | 1978 | if (flags & EF_ARM_INTERWORK) |
9b485d32 | 1979 | _bfd_error_handler (_("\ |
252b5132 | 1980 | Warning: Not setting interwork flag of %s since it has already been specified as non-interworking"), |
fc830a83 NC |
1981 | bfd_get_filename (abfd)); |
1982 | else | |
9b485d32 | 1983 | _bfd_error_handler (_("\ |
252b5132 | 1984 | Warning: Clearing the interwork flag of %s due to outside request"), |
fc830a83 NC |
1985 | bfd_get_filename (abfd)); |
1986 | } | |
252b5132 RH |
1987 | } |
1988 | else | |
1989 | { | |
1990 | elf_elfheader (abfd)->e_flags = flags; | |
1991 | elf_flags_init (abfd) = true; | |
1992 | } | |
1993 | ||
1994 | return true; | |
1995 | } | |
1996 | ||
fc830a83 | 1997 | /* Copy backend specific data from one object module to another. */ |
9b485d32 | 1998 | |
252b5132 RH |
1999 | static boolean |
2000 | elf32_arm_copy_private_bfd_data (ibfd, obfd) | |
2001 | bfd *ibfd; | |
2002 | bfd *obfd; | |
2003 | { | |
2004 | flagword in_flags; | |
2005 | flagword out_flags; | |
2006 | ||
fc830a83 | 2007 | if ( bfd_get_flavour (ibfd) != bfd_target_elf_flavour |
252b5132 RH |
2008 | || bfd_get_flavour (obfd) != bfd_target_elf_flavour) |
2009 | return true; | |
2010 | ||
fc830a83 | 2011 | in_flags = elf_elfheader (ibfd)->e_flags; |
252b5132 RH |
2012 | out_flags = elf_elfheader (obfd)->e_flags; |
2013 | ||
fc830a83 NC |
2014 | if (elf_flags_init (obfd) |
2015 | && EF_ARM_EABI_VERSION (out_flags) == EF_ARM_EABI_UNKNOWN | |
2016 | && in_flags != out_flags) | |
252b5132 | 2017 | { |
252b5132 | 2018 | /* Cannot mix APCS26 and APCS32 code. */ |
fd2ec330 | 2019 | if ((in_flags & EF_ARM_APCS_26) != (out_flags & EF_ARM_APCS_26)) |
252b5132 RH |
2020 | return false; |
2021 | ||
2022 | /* Cannot mix float APCS and non-float APCS code. */ | |
fd2ec330 | 2023 | if ((in_flags & EF_ARM_APCS_FLOAT) != (out_flags & EF_ARM_APCS_FLOAT)) |
252b5132 RH |
2024 | return false; |
2025 | ||
2026 | /* If the src and dest have different interworking flags | |
2027 | then turn off the interworking bit. */ | |
fd2ec330 | 2028 | if ((in_flags & EF_ARM_INTERWORK) != (out_flags & EF_ARM_INTERWORK)) |
252b5132 | 2029 | { |
fd2ec330 | 2030 | if (out_flags & EF_ARM_INTERWORK) |
9b485d32 | 2031 | _bfd_error_handler (_("\ |
252b5132 RH |
2032 | Warning: Clearing the interwork flag in %s because non-interworking code in %s has been linked with it"), |
2033 | bfd_get_filename (obfd), bfd_get_filename (ibfd)); | |
2034 | ||
fd2ec330 | 2035 | in_flags &= ~EF_ARM_INTERWORK; |
252b5132 | 2036 | } |
1006ba19 PB |
2037 | |
2038 | /* Likewise for PIC, though don't warn for this case. */ | |
fd2ec330 PB |
2039 | if ((in_flags & EF_ARM_PIC) != (out_flags & EF_ARM_PIC)) |
2040 | in_flags &= ~EF_ARM_PIC; | |
252b5132 RH |
2041 | } |
2042 | ||
2043 | elf_elfheader (obfd)->e_flags = in_flags; | |
2044 | elf_flags_init (obfd) = true; | |
2045 | ||
2046 | return true; | |
2047 | } | |
2048 | ||
2049 | /* Merge backend specific data from an object file to the output | |
2050 | object file when linking. */ | |
9b485d32 | 2051 | |
252b5132 RH |
2052 | static boolean |
2053 | elf32_arm_merge_private_bfd_data (ibfd, obfd) | |
fc830a83 NC |
2054 | bfd * ibfd; |
2055 | bfd * obfd; | |
252b5132 RH |
2056 | { |
2057 | flagword out_flags; | |
2058 | flagword in_flags; | |
1006ba19 | 2059 | boolean flags_compatible = true; |
cf919dfd PB |
2060 | boolean null_input_bfd = true; |
2061 | asection *sec; | |
252b5132 | 2062 | |
9b485d32 | 2063 | /* Check if we have the same endianess. */ |
1fe494a5 NC |
2064 | if (_bfd_generic_verify_endian_match (ibfd, obfd) == false) |
2065 | return false; | |
2066 | ||
252b5132 RH |
2067 | if ( bfd_get_flavour (ibfd) != bfd_target_elf_flavour |
2068 | || bfd_get_flavour (obfd) != bfd_target_elf_flavour) | |
2069 | return true; | |
2070 | ||
252b5132 RH |
2071 | /* The input BFD must have had its flags initialised. */ |
2072 | /* The following seems bogus to me -- The flags are initialized in | |
2073 | the assembler but I don't think an elf_flags_init field is | |
9b485d32 | 2074 | written into the object. */ |
252b5132 RH |
2075 | /* BFD_ASSERT (elf_flags_init (ibfd)); */ |
2076 | ||
2077 | in_flags = elf_elfheader (ibfd)->e_flags; | |
2078 | out_flags = elf_elfheader (obfd)->e_flags; | |
2079 | ||
2080 | if (!elf_flags_init (obfd)) | |
2081 | { | |
fe077fa6 NC |
2082 | /* If the input is the default architecture and had the default |
2083 | flags then do not bother setting the flags for the output | |
2084 | architecture, instead allow future merges to do this. If no | |
2085 | future merges ever set these flags then they will retain their | |
2086 | uninitialised values, which surprise surprise, correspond | |
252b5132 | 2087 | to the default values. */ |
fe077fa6 NC |
2088 | if (bfd_get_arch_info (ibfd)->the_default |
2089 | && elf_elfheader (ibfd)->e_flags == 0) | |
252b5132 RH |
2090 | return true; |
2091 | ||
2092 | elf_flags_init (obfd) = true; | |
2093 | elf_elfheader (obfd)->e_flags = in_flags; | |
2094 | ||
2095 | if (bfd_get_arch (obfd) == bfd_get_arch (ibfd) | |
2096 | && bfd_get_arch_info (obfd)->the_default) | |
2097 | return bfd_set_arch_mach (obfd, bfd_get_arch (ibfd), bfd_get_mach (ibfd)); | |
2098 | ||
2099 | return true; | |
2100 | } | |
2101 | ||
1006ba19 | 2102 | /* Identical flags must be compatible. */ |
252b5132 RH |
2103 | if (in_flags == out_flags) |
2104 | return true; | |
2105 | ||
cf919dfd PB |
2106 | /* Check to see if the input BFD actually contains any sections. |
2107 | If not, its flags may not have been initialised either, but it cannot | |
2108 | actually cause any incompatibility. */ | |
2109 | for (sec = ibfd->sections; sec != NULL; sec = sec->next) | |
2110 | { | |
2111 | /* Ignore synthetic glue sections. */ | |
2112 | if (strcmp (sec->name, ".glue_7") | |
2113 | && strcmp (sec->name, ".glue_7t")) | |
2114 | { | |
2115 | null_input_bfd = false; | |
2116 | break; | |
2117 | } | |
2118 | } | |
2119 | if (null_input_bfd) | |
2120 | return true; | |
2121 | ||
252b5132 | 2122 | /* Complain about various flag mismatches. */ |
fc830a83 NC |
2123 | if (EF_ARM_EABI_VERSION (in_flags) != EF_ARM_EABI_VERSION (out_flags)) |
2124 | { | |
2125 | _bfd_error_handler (_("\ | |
2126 | Error: %s compiled for EABI version %d, whereas %s is compiled for version %d"), | |
2127 | bfd_get_filename (ibfd), | |
2128 | (in_flags & EF_ARM_EABIMASK) >> 24, | |
2129 | bfd_get_filename (obfd), | |
2130 | (out_flags & EF_ARM_EABIMASK) >> 24); | |
1006ba19 | 2131 | return false; |
fc830a83 | 2132 | } |
252b5132 | 2133 | |
1006ba19 PB |
2134 | /* Not sure what needs to be checked for EABI versions >= 1. */ |
2135 | if (EF_ARM_EABI_VERSION (in_flags) == EF_ARM_EABI_UNKNOWN) | |
2136 | { | |
fd2ec330 | 2137 | if ((in_flags & EF_ARM_APCS_26) != (out_flags & EF_ARM_APCS_26)) |
1006ba19 PB |
2138 | { |
2139 | _bfd_error_handler (_("\ | |
252b5132 RH |
2140 | Error: %s compiled for APCS-%d, whereas %s is compiled for APCS-%d"), |
2141 | bfd_get_filename (ibfd), | |
fd2ec330 | 2142 | in_flags & EF_ARM_APCS_26 ? 26 : 32, |
252b5132 | 2143 | bfd_get_filename (obfd), |
fd2ec330 | 2144 | out_flags & EF_ARM_APCS_26 ? 26 : 32); |
1006ba19 PB |
2145 | flags_compatible = false; |
2146 | } | |
252b5132 | 2147 | |
fd2ec330 | 2148 | if ((in_flags & EF_ARM_APCS_FLOAT) != (out_flags & EF_ARM_APCS_FLOAT)) |
1006ba19 PB |
2149 | { |
2150 | _bfd_error_handler (_("\ | |
252b5132 RH |
2151 | Error: %s passes floats in %s registers, whereas %s passes them in %s registers"), |
2152 | bfd_get_filename (ibfd), | |
fd2ec330 | 2153 | in_flags & EF_ARM_APCS_FLOAT ? _("float") : _("integer"), |
252b5132 | 2154 | bfd_get_filename (obfd), |
fd2ec330 | 2155 | out_flags & EF_ARM_APCS_26 ? _("float") : _("integer")); |
1006ba19 PB |
2156 | flags_compatible = false; |
2157 | } | |
252b5132 | 2158 | |
fd2ec330 PB |
2159 | #ifdef EF_ARM_SOFT_FLOAT |
2160 | if ((in_flags & EF_ARM_SOFT_FLOAT) != (out_flags & EF_ARM_SOFT_FLOAT)) | |
1006ba19 PB |
2161 | { |
2162 | _bfd_error_handler (_ ("\ | |
2163 | Error: %s uses %s floating point, whereas %s uses %s floating point"), | |
2164 | bfd_get_filename (ibfd), | |
fd2ec330 | 2165 | in_flags & EF_ARM_SOFT_FLOAT ? _("soft") : _("hard"), |
1006ba19 | 2166 | bfd_get_filename (obfd), |
fd2ec330 | 2167 | out_flags & EF_ARM_SOFT_FLOAT ? _("soft") : _("hard")); |
1006ba19 PB |
2168 | flags_compatible = false; |
2169 | } | |
ee43f35e | 2170 | #endif |
252b5132 | 2171 | |
1006ba19 | 2172 | /* Interworking mismatch is only a warning. */ |
fd2ec330 | 2173 | if ((in_flags & EF_ARM_INTERWORK) != (out_flags & EF_ARM_INTERWORK)) |
1006ba19 | 2174 | _bfd_error_handler (_("\ |
252b5132 | 2175 | Warning: %s %s interworking, whereas %s %s"), |
d1659392 NC |
2176 | bfd_get_filename (ibfd), |
2177 | in_flags & EF_ARM_INTERWORK ? _("supports") : _("does not support"), | |
2178 | bfd_get_filename (obfd), | |
2179 | out_flags & EF_ARM_INTERWORK ? _("does") : _("does not")); | |
252b5132 RH |
2180 | } |
2181 | ||
1006ba19 | 2182 | return flags_compatible; |
252b5132 RH |
2183 | } |
2184 | ||
9b485d32 NC |
2185 | /* Display the flags field. */ |
2186 | ||
252b5132 RH |
2187 | static boolean |
2188 | elf32_arm_print_private_bfd_data (abfd, ptr) | |
2189 | bfd *abfd; | |
2190 | PTR ptr; | |
2191 | { | |
fc830a83 NC |
2192 | FILE * file = (FILE *) ptr; |
2193 | unsigned long flags; | |
252b5132 RH |
2194 | |
2195 | BFD_ASSERT (abfd != NULL && ptr != NULL); | |
2196 | ||
2197 | /* Print normal ELF private data. */ | |
2198 | _bfd_elf_print_private_bfd_data (abfd, ptr); | |
2199 | ||
fc830a83 | 2200 | flags = elf_elfheader (abfd)->e_flags; |
9b485d32 NC |
2201 | /* Ignore init flag - it may not be set, despite the flags field |
2202 | containing valid data. */ | |
252b5132 RH |
2203 | |
2204 | /* xgettext:c-format */ | |
9b485d32 | 2205 | fprintf (file, _("private flags = %lx:"), elf_elfheader (abfd)->e_flags); |
252b5132 | 2206 | |
fc830a83 NC |
2207 | switch (EF_ARM_EABI_VERSION (flags)) |
2208 | { | |
2209 | case EF_ARM_EABI_UNKNOWN: | |
2210 | /* The following flag bits are GNU extenstions and not part of the | |
2211 | official ARM ELF extended ABI. Hence they are only decoded if | |
2212 | the EABI version is not set. */ | |
fd2ec330 | 2213 | if (flags & EF_ARM_INTERWORK) |
9b485d32 | 2214 | fprintf (file, _(" [interworking enabled]")); |
9a5aca8c | 2215 | |
fd2ec330 | 2216 | if (flags & EF_ARM_APCS_26) |
9b485d32 | 2217 | fprintf (file, _(" [APCS-26]")); |
fc830a83 | 2218 | else |
9b485d32 | 2219 | fprintf (file, _(" [APCS-32]")); |
9a5aca8c | 2220 | |
fd2ec330 | 2221 | if (flags & EF_ARM_APCS_FLOAT) |
9b485d32 | 2222 | fprintf (file, _(" [floats passed in float registers]")); |
9a5aca8c | 2223 | |
fd2ec330 | 2224 | if (flags & EF_ARM_PIC) |
9b485d32 | 2225 | fprintf (file, _(" [position independent]")); |
fc830a83 | 2226 | |
fd2ec330 | 2227 | if (flags & EF_ARM_NEW_ABI) |
9b485d32 | 2228 | fprintf (file, _(" [new ABI]")); |
9a5aca8c | 2229 | |
fd2ec330 | 2230 | if (flags & EF_ARM_OLD_ABI) |
9b485d32 | 2231 | fprintf (file, _(" [old ABI]")); |
9a5aca8c | 2232 | |
fd2ec330 | 2233 | if (flags & EF_ARM_SOFT_FLOAT) |
9b485d32 | 2234 | fprintf (file, _(" [software FP]")); |
9a5aca8c | 2235 | |
fd2ec330 PB |
2236 | flags &= ~(EF_ARM_INTERWORK | EF_ARM_APCS_26 | EF_ARM_APCS_FLOAT | EF_ARM_PIC |
2237 | | EF_ARM_NEW_ABI | EF_ARM_OLD_ABI | EF_ARM_SOFT_FLOAT); | |
fc830a83 | 2238 | break; |
9a5aca8c | 2239 | |
fc830a83 | 2240 | case EF_ARM_EABI_VER1: |
9b485d32 | 2241 | fprintf (file, _(" [Version1 EABI]")); |
9a5aca8c | 2242 | |
fc830a83 | 2243 | if (flags & EF_ARM_SYMSARESORTED) |
9b485d32 | 2244 | fprintf (file, _(" [sorted symbol table]")); |
fc830a83 | 2245 | else |
9b485d32 | 2246 | fprintf (file, _(" [unsorted symbol table]")); |
9a5aca8c | 2247 | |
fc830a83 NC |
2248 | flags &= ~ EF_ARM_SYMSARESORTED; |
2249 | break; | |
9a5aca8c | 2250 | |
fd2ec330 PB |
2251 | case EF_ARM_EABI_VER2: |
2252 | fprintf (file, _(" [Version2 EABI]")); | |
2253 | ||
2254 | if (flags & EF_ARM_SYMSARESORTED) | |
2255 | fprintf (file, _(" [sorted symbol table]")); | |
2256 | else | |
2257 | fprintf (file, _(" [unsorted symbol table]")); | |
2258 | ||
2259 | if (flags & EF_ARM_DYNSYMSUSESEGIDX) | |
2260 | fprintf (file, _(" [dynamic symbols use segment index]")); | |
2261 | ||
2262 | if (flags & EF_ARM_MAPSYMSFIRST) | |
2263 | fprintf (file, _(" [mapping symbols precede others]")); | |
2264 | ||
2265 | flags &= ~(EF_ARM_SYMSARESORTED | EF_ARM_DYNSYMSUSESEGIDX | |
2266 | | EF_ARM_MAPSYMSFIRST); | |
2267 | break; | |
2268 | ||
fc830a83 | 2269 | default: |
9b485d32 | 2270 | fprintf (file, _(" <EABI version unrecognised>")); |
fc830a83 NC |
2271 | break; |
2272 | } | |
252b5132 | 2273 | |
fc830a83 | 2274 | flags &= ~ EF_ARM_EABIMASK; |
252b5132 | 2275 | |
fc830a83 | 2276 | if (flags & EF_ARM_RELEXEC) |
9b485d32 | 2277 | fprintf (file, _(" [relocatable executable]")); |
252b5132 | 2278 | |
fc830a83 | 2279 | if (flags & EF_ARM_HASENTRY) |
9b485d32 | 2280 | fprintf (file, _(" [has entry point]")); |
252b5132 | 2281 | |
fc830a83 NC |
2282 | flags &= ~ (EF_ARM_RELEXEC | EF_ARM_HASENTRY); |
2283 | ||
2284 | if (flags) | |
9b485d32 | 2285 | fprintf (file, _("<Unrecognised flag bits set>")); |
9a5aca8c | 2286 | |
252b5132 RH |
2287 | fputc ('\n', file); |
2288 | ||
2289 | return true; | |
2290 | } | |
2291 | ||
2292 | static int | |
2293 | elf32_arm_get_symbol_type (elf_sym, type) | |
2294 | Elf_Internal_Sym * elf_sym; | |
2295 | int type; | |
2296 | { | |
2f0ca46a NC |
2297 | switch (ELF_ST_TYPE (elf_sym->st_info)) |
2298 | { | |
2299 | case STT_ARM_TFUNC: | |
2300 | return ELF_ST_TYPE (elf_sym->st_info); | |
ce855c42 | 2301 | |
2f0ca46a NC |
2302 | case STT_ARM_16BIT: |
2303 | /* If the symbol is not an object, return the STT_ARM_16BIT flag. | |
2304 | This allows us to distinguish between data used by Thumb instructions | |
2305 | and non-data (which is probably code) inside Thumb regions of an | |
2306 | executable. */ | |
2307 | if (type != STT_OBJECT) | |
2308 | return ELF_ST_TYPE (elf_sym->st_info); | |
2309 | break; | |
9a5aca8c | 2310 | |
ce855c42 NC |
2311 | default: |
2312 | break; | |
2f0ca46a NC |
2313 | } |
2314 | ||
2315 | return type; | |
252b5132 | 2316 | } |
f21f3fe0 | 2317 | |
252b5132 RH |
2318 | static asection * |
2319 | elf32_arm_gc_mark_hook (abfd, info, rel, h, sym) | |
2320 | bfd *abfd; | |
5f771d47 | 2321 | struct bfd_link_info *info ATTRIBUTE_UNUSED; |
252b5132 RH |
2322 | Elf_Internal_Rela *rel; |
2323 | struct elf_link_hash_entry *h; | |
2324 | Elf_Internal_Sym *sym; | |
2325 | { | |
2326 | if (h != NULL) | |
2327 | { | |
2328 | switch (ELF32_R_TYPE (rel->r_info)) | |
2329 | { | |
2330 | case R_ARM_GNU_VTINHERIT: | |
2331 | case R_ARM_GNU_VTENTRY: | |
2332 | break; | |
2333 | ||
2334 | default: | |
2335 | switch (h->root.type) | |
2336 | { | |
2337 | case bfd_link_hash_defined: | |
2338 | case bfd_link_hash_defweak: | |
2339 | return h->root.u.def.section; | |
2340 | ||
2341 | case bfd_link_hash_common: | |
2342 | return h->root.u.c.p->section; | |
e049a0de ILT |
2343 | |
2344 | default: | |
2345 | break; | |
252b5132 RH |
2346 | } |
2347 | } | |
2348 | } | |
2349 | else | |
2350 | { | |
2351 | if (!(elf_bad_symtab (abfd) | |
2352 | && ELF_ST_BIND (sym->st_info) != STB_LOCAL) | |
2353 | && ! ((sym->st_shndx <= 0 || sym->st_shndx >= SHN_LORESERVE) | |
2354 | && sym->st_shndx != SHN_COMMON)) | |
2355 | { | |
2356 | return bfd_section_from_elf_index (abfd, sym->st_shndx); | |
2357 | } | |
2358 | } | |
2359 | return NULL; | |
2360 | } | |
2361 | ||
780a67af NC |
2362 | /* Update the got entry reference counts for the section being removed. */ |
2363 | ||
252b5132 RH |
2364 | static boolean |
2365 | elf32_arm_gc_sweep_hook (abfd, info, sec, relocs) | |
5f771d47 ILT |
2366 | bfd *abfd ATTRIBUTE_UNUSED; |
2367 | struct bfd_link_info *info ATTRIBUTE_UNUSED; | |
2368 | asection *sec ATTRIBUTE_UNUSED; | |
2369 | const Elf_Internal_Rela *relocs ATTRIBUTE_UNUSED; | |
252b5132 | 2370 | { |
780a67af | 2371 | /* We don't support garbage collection of GOT and PLT relocs yet. */ |
252b5132 RH |
2372 | return true; |
2373 | } | |
2374 | ||
780a67af NC |
2375 | /* Look through the relocs for a section during the first phase. */ |
2376 | ||
252b5132 RH |
2377 | static boolean |
2378 | elf32_arm_check_relocs (abfd, info, sec, relocs) | |
2379 | bfd * abfd; | |
2380 | struct bfd_link_info * info; | |
2381 | asection * sec; | |
2382 | const Elf_Internal_Rela * relocs; | |
2383 | { | |
2384 | Elf_Internal_Shdr * symtab_hdr; | |
2385 | struct elf_link_hash_entry ** sym_hashes; | |
2386 | struct elf_link_hash_entry ** sym_hashes_end; | |
2387 | const Elf_Internal_Rela * rel; | |
2388 | const Elf_Internal_Rela * rel_end; | |
2389 | bfd * dynobj; | |
2390 | asection * sgot, *srelgot, *sreloc; | |
2391 | bfd_vma * local_got_offsets; | |
9a5aca8c | 2392 | |
252b5132 RH |
2393 | if (info->relocateable) |
2394 | return true; | |
9a5aca8c | 2395 | |
252b5132 | 2396 | sgot = srelgot = sreloc = NULL; |
9a5aca8c | 2397 | |
252b5132 RH |
2398 | dynobj = elf_hash_table (info)->dynobj; |
2399 | local_got_offsets = elf_local_got_offsets (abfd); | |
f21f3fe0 | 2400 | |
252b5132 RH |
2401 | symtab_hdr = &elf_tdata (abfd)->symtab_hdr; |
2402 | sym_hashes = elf_sym_hashes (abfd); | |
9b485d32 NC |
2403 | sym_hashes_end = sym_hashes |
2404 | + symtab_hdr->sh_size / sizeof (Elf32_External_Sym); | |
2405 | ||
252b5132 RH |
2406 | if (!elf_bad_symtab (abfd)) |
2407 | sym_hashes_end -= symtab_hdr->sh_info; | |
9b485d32 | 2408 | |
252b5132 RH |
2409 | rel_end = relocs + sec->reloc_count; |
2410 | for (rel = relocs; rel < rel_end; rel++) | |
2411 | { | |
2412 | struct elf_link_hash_entry *h; | |
2413 | unsigned long r_symndx; | |
9a5aca8c | 2414 | |
252b5132 RH |
2415 | r_symndx = ELF32_R_SYM (rel->r_info); |
2416 | if (r_symndx < symtab_hdr->sh_info) | |
2417 | h = NULL; | |
2418 | else | |
2419 | h = sym_hashes[r_symndx - symtab_hdr->sh_info]; | |
9a5aca8c | 2420 | |
252b5132 RH |
2421 | /* Some relocs require a global offset table. */ |
2422 | if (dynobj == NULL) | |
2423 | { | |
2424 | switch (ELF32_R_TYPE (rel->r_info)) | |
2425 | { | |
2426 | case R_ARM_GOT32: | |
2427 | case R_ARM_GOTOFF: | |
2428 | case R_ARM_GOTPC: | |
2429 | elf_hash_table (info)->dynobj = dynobj = abfd; | |
2430 | if (! _bfd_elf_create_got_section (dynobj, info)) | |
2431 | return false; | |
2432 | break; | |
2433 | ||
2434 | default: | |
2435 | break; | |
2436 | } | |
2437 | } | |
2438 | ||
2439 | switch (ELF32_R_TYPE (rel->r_info)) | |
2440 | { | |
2441 | case R_ARM_GOT32: | |
2442 | /* This symbol requires a global offset table entry. */ | |
2443 | if (sgot == NULL) | |
2444 | { | |
2445 | sgot = bfd_get_section_by_name (dynobj, ".got"); | |
2446 | BFD_ASSERT (sgot != NULL); | |
2447 | } | |
2448 | ||
2449 | /* Get the got relocation section if necessary. */ | |
2450 | if (srelgot == NULL | |
2451 | && (h != NULL || info->shared)) | |
2452 | { | |
2453 | srelgot = bfd_get_section_by_name (dynobj, ".rel.got"); | |
9a5aca8c | 2454 | |
252b5132 RH |
2455 | /* If no got relocation section, make one and initialize. */ |
2456 | if (srelgot == NULL) | |
2457 | { | |
2458 | srelgot = bfd_make_section (dynobj, ".rel.got"); | |
2459 | if (srelgot == NULL | |
2460 | || ! bfd_set_section_flags (dynobj, srelgot, | |
2461 | (SEC_ALLOC | |
2462 | | SEC_LOAD | |
2463 | | SEC_HAS_CONTENTS | |
2464 | | SEC_IN_MEMORY | |
2465 | | SEC_LINKER_CREATED | |
2466 | | SEC_READONLY)) | |
2467 | || ! bfd_set_section_alignment (dynobj, srelgot, 2)) | |
2468 | return false; | |
2469 | } | |
2470 | } | |
2471 | ||
2472 | if (h != NULL) | |
2473 | { | |
2474 | if (h->got.offset != (bfd_vma) -1) | |
2475 | /* We have already allocated space in the .got. */ | |
2476 | break; | |
f21f3fe0 | 2477 | |
252b5132 RH |
2478 | h->got.offset = sgot->_raw_size; |
2479 | ||
2480 | /* Make sure this symbol is output as a dynamic symbol. */ | |
2481 | if (h->dynindx == -1) | |
2482 | if (! bfd_elf32_link_record_dynamic_symbol (info, h)) | |
2483 | return false; | |
2484 | ||
2485 | srelgot->_raw_size += sizeof (Elf32_External_Rel); | |
2486 | } | |
2487 | else | |
2488 | { | |
2489 | /* This is a global offset table entry for a local | |
2490 | symbol. */ | |
2491 | if (local_got_offsets == NULL) | |
2492 | { | |
2493 | size_t size; | |
2494 | register unsigned int i; | |
2495 | ||
2496 | size = symtab_hdr->sh_info * sizeof (bfd_vma); | |
2497 | local_got_offsets = (bfd_vma *) bfd_alloc (abfd, size); | |
2498 | if (local_got_offsets == NULL) | |
2499 | return false; | |
2500 | elf_local_got_offsets (abfd) = local_got_offsets; | |
2501 | for (i = 0; i < symtab_hdr->sh_info; i++) | |
2502 | local_got_offsets[i] = (bfd_vma) -1; | |
2503 | } | |
f21f3fe0 | 2504 | |
252b5132 RH |
2505 | if (local_got_offsets[r_symndx] != (bfd_vma) -1) |
2506 | /* We have already allocated space in the .got. */ | |
2507 | break; | |
2508 | ||
2509 | local_got_offsets[r_symndx] = sgot->_raw_size; | |
2510 | ||
2511 | if (info->shared) | |
2512 | /* If we are generating a shared object, we need to | |
2513 | output a R_ARM_RELATIVE reloc so that the dynamic | |
2514 | linker can adjust this GOT entry. */ | |
2515 | srelgot->_raw_size += sizeof (Elf32_External_Rel); | |
2516 | } | |
2517 | ||
2518 | sgot->_raw_size += 4; | |
2519 | break; | |
2520 | ||
2521 | case R_ARM_PLT32: | |
2522 | /* This symbol requires a procedure linkage table entry. We | |
2523 | actually build the entry in adjust_dynamic_symbol, | |
2524 | because this might be a case of linking PIC code which is | |
2525 | never referenced by a dynamic object, in which case we | |
2526 | don't need to generate a procedure linkage table entry | |
2527 | after all. */ | |
2528 | ||
2529 | /* If this is a local symbol, we resolve it directly without | |
2530 | creating a procedure linkage table entry. */ | |
2531 | if (h == NULL) | |
2532 | continue; | |
2533 | ||
2534 | h->elf_link_hash_flags |= ELF_LINK_HASH_NEEDS_PLT; | |
2535 | break; | |
2536 | ||
2537 | case R_ARM_ABS32: | |
2538 | case R_ARM_REL32: | |
2539 | case R_ARM_PC24: | |
2540 | /* If we are creating a shared library, and this is a reloc | |
2541 | against a global symbol, or a non PC relative reloc | |
2542 | against a local symbol, then we need to copy the reloc | |
2543 | into the shared library. However, if we are linking with | |
2544 | -Bsymbolic, we do not need to copy a reloc against a | |
2545 | global symbol which is defined in an object we are | |
2546 | including in the link (i.e., DEF_REGULAR is set). At | |
2547 | this point we have not seen all the input files, so it is | |
2548 | possible that DEF_REGULAR is not set now but will be set | |
2549 | later (it is never cleared). We account for that | |
2550 | possibility below by storing information in the | |
2551 | pcrel_relocs_copied field of the hash table entry. */ | |
2552 | if (info->shared | |
2553 | && (ELF32_R_TYPE (rel->r_info) != R_ARM_PC24 | |
2554 | || (h != NULL | |
2555 | && (! info->symbolic | |
2556 | || (h->elf_link_hash_flags | |
2557 | & ELF_LINK_HASH_DEF_REGULAR) == 0)))) | |
2558 | { | |
2559 | /* When creating a shared object, we must copy these | |
2560 | reloc types into the output file. We create a reloc | |
2561 | section in dynobj and make room for this reloc. */ | |
2562 | if (sreloc == NULL) | |
2563 | { | |
2564 | const char * name; | |
2565 | ||
2566 | name = (bfd_elf_string_from_elf_section | |
2567 | (abfd, | |
2568 | elf_elfheader (abfd)->e_shstrndx, | |
2569 | elf_section_data (sec)->rel_hdr.sh_name)); | |
2570 | if (name == NULL) | |
2571 | return false; | |
2572 | ||
2573 | BFD_ASSERT (strncmp (name, ".rel", 4) == 0 | |
2574 | && strcmp (bfd_get_section_name (abfd, sec), | |
2575 | name + 4) == 0); | |
2576 | ||
2577 | sreloc = bfd_get_section_by_name (dynobj, name); | |
2578 | if (sreloc == NULL) | |
2579 | { | |
2580 | flagword flags; | |
2581 | ||
2582 | sreloc = bfd_make_section (dynobj, name); | |
2583 | flags = (SEC_HAS_CONTENTS | SEC_READONLY | |
2584 | | SEC_IN_MEMORY | SEC_LINKER_CREATED); | |
2585 | if ((sec->flags & SEC_ALLOC) != 0) | |
2586 | flags |= SEC_ALLOC | SEC_LOAD; | |
2587 | if (sreloc == NULL | |
2588 | || ! bfd_set_section_flags (dynobj, sreloc, flags) | |
2589 | || ! bfd_set_section_alignment (dynobj, sreloc, 2)) | |
2590 | return false; | |
2591 | } | |
2592 | } | |
2593 | ||
2594 | sreloc->_raw_size += sizeof (Elf32_External_Rel); | |
2595 | /* If we are linking with -Bsymbolic, and this is a | |
2596 | global symbol, we count the number of PC relative | |
2597 | relocations we have entered for this symbol, so that | |
2598 | we can discard them again if the symbol is later | |
2599 | defined by a regular object. Note that this function | |
2600 | is only called if we are using an elf_i386 linker | |
2601 | hash table, which means that h is really a pointer to | |
2602 | an elf_i386_link_hash_entry. */ | |
2603 | if (h != NULL && info->symbolic | |
2604 | && ELF32_R_TYPE (rel->r_info) == R_ARM_PC24) | |
2605 | { | |
2606 | struct elf32_arm_link_hash_entry * eh; | |
2607 | struct elf32_arm_pcrel_relocs_copied * p; | |
2608 | ||
2609 | eh = (struct elf32_arm_link_hash_entry *) h; | |
2610 | ||
2611 | for (p = eh->pcrel_relocs_copied; p != NULL; p = p->next) | |
2612 | if (p->section == sreloc) | |
2613 | break; | |
2614 | ||
2615 | if (p == NULL) | |
2616 | { | |
2617 | p = ((struct elf32_arm_pcrel_relocs_copied *) | |
2618 | bfd_alloc (dynobj, sizeof * p)); | |
f21f3fe0 | 2619 | |
252b5132 RH |
2620 | if (p == NULL) |
2621 | return false; | |
2622 | p->next = eh->pcrel_relocs_copied; | |
2623 | eh->pcrel_relocs_copied = p; | |
2624 | p->section = sreloc; | |
2625 | p->count = 0; | |
2626 | } | |
2627 | ||
2628 | ++p->count; | |
2629 | } | |
2630 | } | |
2631 | break; | |
2632 | ||
2633 | /* This relocation describes the C++ object vtable hierarchy. | |
2634 | Reconstruct it for later use during GC. */ | |
2635 | case R_ARM_GNU_VTINHERIT: | |
2636 | if (!_bfd_elf32_gc_record_vtinherit (abfd, sec, h, rel->r_offset)) | |
2637 | return false; | |
2638 | break; | |
9a5aca8c | 2639 | |
252b5132 RH |
2640 | /* This relocation describes which C++ vtable entries are actually |
2641 | used. Record for later use during GC. */ | |
2642 | case R_ARM_GNU_VTENTRY: | |
d512aa07 | 2643 | if (!_bfd_elf32_gc_record_vtentry (abfd, sec, h, rel->r_offset)) |
252b5132 RH |
2644 | return false; |
2645 | break; | |
2646 | } | |
2647 | } | |
f21f3fe0 | 2648 | |
252b5132 RH |
2649 | return true; |
2650 | } | |
2651 | ||
252b5132 RH |
2652 | /* Find the nearest line to a particular section and offset, for error |
2653 | reporting. This code is a duplicate of the code in elf.c, except | |
9b485d32 | 2654 | that it also accepts STT_ARM_TFUNC as a symbol that names a function. */ |
252b5132 RH |
2655 | |
2656 | static boolean | |
2657 | elf32_arm_find_nearest_line | |
2658 | (abfd, section, symbols, offset, filename_ptr, functionname_ptr, line_ptr) | |
2659 | bfd * abfd; | |
2660 | asection * section; | |
2661 | asymbol ** symbols; | |
2662 | bfd_vma offset; | |
2663 | CONST char ** filename_ptr; | |
2664 | CONST char ** functionname_ptr; | |
2665 | unsigned int * line_ptr; | |
2666 | { | |
2667 | boolean found; | |
2668 | const char * filename; | |
2669 | asymbol * func; | |
2670 | bfd_vma low_func; | |
2671 | asymbol ** p; | |
2672 | ||
2673 | if (_bfd_dwarf2_find_nearest_line (abfd, section, symbols, offset, | |
f21f3fe0 | 2674 | filename_ptr, functionname_ptr, |
857ec808 NC |
2675 | line_ptr, 0, |
2676 | &elf_tdata (abfd)->dwarf2_find_line_info)) | |
252b5132 RH |
2677 | return true; |
2678 | ||
2679 | if (! _bfd_stab_section_find_nearest_line (abfd, symbols, section, offset, | |
2680 | &found, filename_ptr, | |
2681 | functionname_ptr, line_ptr, | |
2682 | &elf_tdata (abfd)->line_info)) | |
2683 | return false; | |
f21f3fe0 | 2684 | |
252b5132 RH |
2685 | if (found) |
2686 | return true; | |
2687 | ||
2688 | if (symbols == NULL) | |
2689 | return false; | |
2690 | ||
2691 | filename = NULL; | |
2692 | func = NULL; | |
2693 | low_func = 0; | |
2694 | ||
2695 | for (p = symbols; *p != NULL; p++) | |
2696 | { | |
2697 | elf_symbol_type *q; | |
2698 | ||
2699 | q = (elf_symbol_type *) *p; | |
2700 | ||
2701 | if (bfd_get_section (&q->symbol) != section) | |
2702 | continue; | |
2703 | ||
2704 | switch (ELF_ST_TYPE (q->internal_elf_sym.st_info)) | |
2705 | { | |
2706 | default: | |
2707 | break; | |
2708 | case STT_FILE: | |
2709 | filename = bfd_asymbol_name (&q->symbol); | |
2710 | break; | |
2711 | case STT_NOTYPE: | |
2712 | case STT_FUNC: | |
2713 | case STT_ARM_TFUNC: | |
2714 | if (q->symbol.section == section | |
2715 | && q->symbol.value >= low_func | |
2716 | && q->symbol.value <= offset) | |
2717 | { | |
2718 | func = (asymbol *) q; | |
2719 | low_func = q->symbol.value; | |
2720 | } | |
2721 | break; | |
2722 | } | |
2723 | } | |
2724 | ||
2725 | if (func == NULL) | |
2726 | return false; | |
2727 | ||
2728 | *filename_ptr = filename; | |
2729 | *functionname_ptr = bfd_asymbol_name (func); | |
2730 | *line_ptr = 0; | |
f21f3fe0 | 2731 | |
252b5132 RH |
2732 | return true; |
2733 | } | |
2734 | ||
2735 | /* Adjust a symbol defined by a dynamic object and referenced by a | |
2736 | regular object. The current definition is in some section of the | |
2737 | dynamic object, but we're not including those sections. We have to | |
2738 | change the definition to something the rest of the link can | |
2739 | understand. */ | |
2740 | ||
2741 | static boolean | |
2742 | elf32_arm_adjust_dynamic_symbol (info, h) | |
2743 | struct bfd_link_info * info; | |
2744 | struct elf_link_hash_entry * h; | |
2745 | { | |
2746 | bfd * dynobj; | |
2747 | asection * s; | |
2748 | unsigned int power_of_two; | |
2749 | ||
2750 | dynobj = elf_hash_table (info)->dynobj; | |
2751 | ||
2752 | /* Make sure we know what is going on here. */ | |
2753 | BFD_ASSERT (dynobj != NULL | |
2754 | && ((h->elf_link_hash_flags & ELF_LINK_HASH_NEEDS_PLT) | |
2755 | || h->weakdef != NULL | |
2756 | || ((h->elf_link_hash_flags | |
2757 | & ELF_LINK_HASH_DEF_DYNAMIC) != 0 | |
2758 | && (h->elf_link_hash_flags | |
2759 | & ELF_LINK_HASH_REF_REGULAR) != 0 | |
2760 | && (h->elf_link_hash_flags | |
2761 | & ELF_LINK_HASH_DEF_REGULAR) == 0))); | |
2762 | ||
2763 | /* If this is a function, put it in the procedure linkage table. We | |
2764 | will fill in the contents of the procedure linkage table later, | |
2765 | when we know the address of the .got section. */ | |
2766 | if (h->type == STT_FUNC | |
2767 | || (h->elf_link_hash_flags & ELF_LINK_HASH_NEEDS_PLT) != 0) | |
2768 | { | |
2769 | if (! info->shared | |
2770 | && (h->elf_link_hash_flags & ELF_LINK_HASH_DEF_DYNAMIC) == 0 | |
2771 | && (h->elf_link_hash_flags & ELF_LINK_HASH_REF_DYNAMIC) == 0) | |
2772 | { | |
2773 | /* This case can occur if we saw a PLT32 reloc in an input | |
2774 | file, but the symbol was never referred to by a dynamic | |
2775 | object. In such a case, we don't actually need to build | |
2776 | a procedure linkage table, and we can just do a PC32 | |
2777 | reloc instead. */ | |
2778 | BFD_ASSERT ((h->elf_link_hash_flags & ELF_LINK_HASH_NEEDS_PLT) != 0); | |
2779 | return true; | |
2780 | } | |
2781 | ||
2782 | /* Make sure this symbol is output as a dynamic symbol. */ | |
2783 | if (h->dynindx == -1) | |
2784 | { | |
2785 | if (! bfd_elf32_link_record_dynamic_symbol (info, h)) | |
2786 | return false; | |
2787 | } | |
2788 | ||
2789 | s = bfd_get_section_by_name (dynobj, ".plt"); | |
2790 | BFD_ASSERT (s != NULL); | |
2791 | ||
2792 | /* If this is the first .plt entry, make room for the special | |
2793 | first entry. */ | |
2794 | if (s->_raw_size == 0) | |
2795 | s->_raw_size += PLT_ENTRY_SIZE; | |
2796 | ||
2797 | /* If this symbol is not defined in a regular file, and we are | |
2798 | not generating a shared library, then set the symbol to this | |
2799 | location in the .plt. This is required to make function | |
2800 | pointers compare as equal between the normal executable and | |
2801 | the shared library. */ | |
2802 | if (! info->shared | |
2803 | && (h->elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR) == 0) | |
2804 | { | |
2805 | h->root.u.def.section = s; | |
2806 | h->root.u.def.value = s->_raw_size; | |
2807 | } | |
2808 | ||
2809 | h->plt.offset = s->_raw_size; | |
2810 | ||
2811 | /* Make room for this entry. */ | |
2812 | s->_raw_size += PLT_ENTRY_SIZE; | |
2813 | ||
2814 | /* We also need to make an entry in the .got.plt section, which | |
2815 | will be placed in the .got section by the linker script. */ | |
252b5132 RH |
2816 | s = bfd_get_section_by_name (dynobj, ".got.plt"); |
2817 | BFD_ASSERT (s != NULL); | |
2818 | s->_raw_size += 4; | |
2819 | ||
2820 | /* We also need to make an entry in the .rel.plt section. */ | |
2821 | ||
2822 | s = bfd_get_section_by_name (dynobj, ".rel.plt"); | |
2823 | BFD_ASSERT (s != NULL); | |
2824 | s->_raw_size += sizeof (Elf32_External_Rel); | |
2825 | ||
2826 | return true; | |
2827 | } | |
2828 | ||
2829 | /* If this is a weak symbol, and there is a real definition, the | |
2830 | processor independent code will have arranged for us to see the | |
2831 | real definition first, and we can just use the same value. */ | |
2832 | if (h->weakdef != NULL) | |
2833 | { | |
2834 | BFD_ASSERT (h->weakdef->root.type == bfd_link_hash_defined | |
2835 | || h->weakdef->root.type == bfd_link_hash_defweak); | |
2836 | h->root.u.def.section = h->weakdef->root.u.def.section; | |
2837 | h->root.u.def.value = h->weakdef->root.u.def.value; | |
2838 | return true; | |
2839 | } | |
2840 | ||
2841 | /* This is a reference to a symbol defined by a dynamic object which | |
2842 | is not a function. */ | |
2843 | ||
2844 | /* If we are creating a shared library, we must presume that the | |
2845 | only references to the symbol are via the global offset table. | |
2846 | For such cases we need not do anything here; the relocations will | |
2847 | be handled correctly by relocate_section. */ | |
2848 | if (info->shared) | |
2849 | return true; | |
2850 | ||
2851 | /* We must allocate the symbol in our .dynbss section, which will | |
2852 | become part of the .bss section of the executable. There will be | |
2853 | an entry for this symbol in the .dynsym section. The dynamic | |
2854 | object will contain position independent code, so all references | |
2855 | from the dynamic object to this symbol will go through the global | |
2856 | offset table. The dynamic linker will use the .dynsym entry to | |
2857 | determine the address it must put in the global offset table, so | |
2858 | both the dynamic object and the regular object will refer to the | |
2859 | same memory location for the variable. */ | |
252b5132 RH |
2860 | s = bfd_get_section_by_name (dynobj, ".dynbss"); |
2861 | BFD_ASSERT (s != NULL); | |
2862 | ||
2863 | /* We must generate a R_ARM_COPY reloc to tell the dynamic linker to | |
2864 | copy the initial value out of the dynamic object and into the | |
2865 | runtime process image. We need to remember the offset into the | |
2866 | .rel.bss section we are going to use. */ | |
2867 | if ((h->root.u.def.section->flags & SEC_ALLOC) != 0) | |
2868 | { | |
2869 | asection *srel; | |
2870 | ||
2871 | srel = bfd_get_section_by_name (dynobj, ".rel.bss"); | |
2872 | BFD_ASSERT (srel != NULL); | |
2873 | srel->_raw_size += sizeof (Elf32_External_Rel); | |
2874 | h->elf_link_hash_flags |= ELF_LINK_HASH_NEEDS_COPY; | |
2875 | } | |
2876 | ||
2877 | /* We need to figure out the alignment required for this symbol. I | |
2878 | have no idea how ELF linkers handle this. */ | |
2879 | power_of_two = bfd_log2 (h->size); | |
2880 | if (power_of_two > 3) | |
2881 | power_of_two = 3; | |
2882 | ||
2883 | /* Apply the required alignment. */ | |
2884 | s->_raw_size = BFD_ALIGN (s->_raw_size, | |
2885 | (bfd_size_type) (1 << power_of_two)); | |
2886 | if (power_of_two > bfd_get_section_alignment (dynobj, s)) | |
2887 | { | |
2888 | if (! bfd_set_section_alignment (dynobj, s, power_of_two)) | |
2889 | return false; | |
2890 | } | |
2891 | ||
2892 | /* Define the symbol as being at this point in the section. */ | |
2893 | h->root.u.def.section = s; | |
2894 | h->root.u.def.value = s->_raw_size; | |
2895 | ||
2896 | /* Increment the section size to make room for the symbol. */ | |
2897 | s->_raw_size += h->size; | |
2898 | ||
2899 | return true; | |
2900 | } | |
2901 | ||
2902 | /* Set the sizes of the dynamic sections. */ | |
2903 | ||
2904 | static boolean | |
2905 | elf32_arm_size_dynamic_sections (output_bfd, info) | |
2906 | bfd * output_bfd; | |
2907 | struct bfd_link_info * info; | |
2908 | { | |
2909 | bfd * dynobj; | |
2910 | asection * s; | |
2911 | boolean plt; | |
2912 | boolean relocs; | |
2913 | boolean reltext; | |
2914 | ||
2915 | dynobj = elf_hash_table (info)->dynobj; | |
2916 | BFD_ASSERT (dynobj != NULL); | |
2917 | ||
2918 | if (elf_hash_table (info)->dynamic_sections_created) | |
2919 | { | |
2920 | /* Set the contents of the .interp section to the interpreter. */ | |
2921 | if (! info->shared) | |
2922 | { | |
2923 | s = bfd_get_section_by_name (dynobj, ".interp"); | |
2924 | BFD_ASSERT (s != NULL); | |
2925 | s->_raw_size = sizeof ELF_DYNAMIC_INTERPRETER; | |
2926 | s->contents = (unsigned char *) ELF_DYNAMIC_INTERPRETER; | |
2927 | } | |
2928 | } | |
2929 | else | |
2930 | { | |
2931 | /* We may have created entries in the .rel.got section. | |
2932 | However, if we are not creating the dynamic sections, we will | |
2933 | not actually use these entries. Reset the size of .rel.got, | |
2934 | which will cause it to get stripped from the output file | |
2935 | below. */ | |
2936 | s = bfd_get_section_by_name (dynobj, ".rel.got"); | |
2937 | if (s != NULL) | |
2938 | s->_raw_size = 0; | |
2939 | } | |
2940 | ||
2941 | /* If this is a -Bsymbolic shared link, then we need to discard all | |
2942 | PC relative relocs against symbols defined in a regular object. | |
2943 | We allocated space for them in the check_relocs routine, but we | |
2944 | will not fill them in in the relocate_section routine. */ | |
2945 | if (info->shared && info->symbolic) | |
2946 | elf32_arm_link_hash_traverse (elf32_arm_hash_table (info), | |
2947 | elf32_arm_discard_copies, | |
2948 | (PTR) NULL); | |
2949 | ||
2950 | /* The check_relocs and adjust_dynamic_symbol entry points have | |
2951 | determined the sizes of the various dynamic sections. Allocate | |
2952 | memory for them. */ | |
2953 | plt = false; | |
2954 | relocs = false; | |
2955 | reltext = false; | |
2956 | for (s = dynobj->sections; s != NULL; s = s->next) | |
2957 | { | |
2958 | const char * name; | |
2959 | boolean strip; | |
2960 | ||
2961 | if ((s->flags & SEC_LINKER_CREATED) == 0) | |
2962 | continue; | |
2963 | ||
2964 | /* It's OK to base decisions on the section name, because none | |
2965 | of the dynobj section names depend upon the input files. */ | |
2966 | name = bfd_get_section_name (dynobj, s); | |
2967 | ||
2968 | strip = false; | |
2969 | ||
2970 | if (strcmp (name, ".plt") == 0) | |
2971 | { | |
2972 | if (s->_raw_size == 0) | |
2973 | { | |
2974 | /* Strip this section if we don't need it; see the | |
2975 | comment below. */ | |
2976 | strip = true; | |
2977 | } | |
2978 | else | |
2979 | { | |
2980 | /* Remember whether there is a PLT. */ | |
2981 | plt = true; | |
2982 | } | |
2983 | } | |
2984 | else if (strncmp (name, ".rel", 4) == 0) | |
2985 | { | |
2986 | if (s->_raw_size == 0) | |
2987 | { | |
2988 | /* If we don't need this section, strip it from the | |
2989 | output file. This is mostly to handle .rel.bss and | |
2990 | .rel.plt. We must create both sections in | |
2991 | create_dynamic_sections, because they must be created | |
2992 | before the linker maps input sections to output | |
2993 | sections. The linker does that before | |
2994 | adjust_dynamic_symbol is called, and it is that | |
2995 | function which decides whether anything needs to go | |
2996 | into these sections. */ | |
2997 | strip = true; | |
2998 | } | |
2999 | else | |
3000 | { | |
3001 | asection * target; | |
3002 | ||
3003 | /* Remember whether there are any reloc sections other | |
3004 | than .rel.plt. */ | |
3005 | if (strcmp (name, ".rel.plt") != 0) | |
3006 | { | |
3007 | const char *outname; | |
3008 | ||
3009 | relocs = true; | |
3010 | ||
3011 | /* If this relocation section applies to a read only | |
3012 | section, then we probably need a DT_TEXTREL | |
3013 | entry. The entries in the .rel.plt section | |
3014 | really apply to the .got section, which we | |
3015 | created ourselves and so know is not readonly. */ | |
3016 | outname = bfd_get_section_name (output_bfd, | |
3017 | s->output_section); | |
3018 | target = bfd_get_section_by_name (output_bfd, outname + 4); | |
9a5aca8c | 3019 | |
252b5132 RH |
3020 | if (target != NULL |
3021 | && (target->flags & SEC_READONLY) != 0 | |
3022 | && (target->flags & SEC_ALLOC) != 0) | |
3023 | reltext = true; | |
3024 | } | |
3025 | ||
3026 | /* We use the reloc_count field as a counter if we need | |
3027 | to copy relocs into the output file. */ | |
3028 | s->reloc_count = 0; | |
3029 | } | |
3030 | } | |
3031 | else if (strncmp (name, ".got", 4) != 0) | |
3032 | { | |
3033 | /* It's not one of our sections, so don't allocate space. */ | |
3034 | continue; | |
3035 | } | |
3036 | ||
3037 | if (strip) | |
3038 | { | |
3039 | asection ** spp; | |
3040 | ||
3041 | for (spp = &s->output_section->owner->sections; | |
3042 | *spp != s->output_section; | |
3043 | spp = &(*spp)->next) | |
3044 | ; | |
3045 | *spp = s->output_section->next; | |
3046 | --s->output_section->owner->section_count; | |
3047 | ||
3048 | continue; | |
3049 | } | |
3050 | ||
3051 | /* Allocate memory for the section contents. */ | |
3052 | s->contents = (bfd_byte *) bfd_zalloc (dynobj, s->_raw_size); | |
3053 | if (s->contents == NULL && s->_raw_size != 0) | |
3054 | return false; | |
3055 | } | |
3056 | ||
3057 | if (elf_hash_table (info)->dynamic_sections_created) | |
3058 | { | |
3059 | /* Add some entries to the .dynamic section. We fill in the | |
3060 | values later, in elf32_arm_finish_dynamic_sections, but we | |
3061 | must add the entries now so that we get the correct size for | |
3062 | the .dynamic section. The DT_DEBUG entry is filled in by the | |
3063 | dynamic linker and used by the debugger. */ | |
3064 | if (! info->shared) | |
3065 | { | |
3066 | if (! bfd_elf32_add_dynamic_entry (info, DT_DEBUG, 0)) | |
3067 | return false; | |
3068 | } | |
3069 | ||
3070 | if (plt) | |
3071 | { | |
9b485d32 | 3072 | if ( ! bfd_elf32_add_dynamic_entry (info, DT_PLTGOT, 0) |
252b5132 RH |
3073 | || ! bfd_elf32_add_dynamic_entry (info, DT_PLTRELSZ, 0) |
3074 | || ! bfd_elf32_add_dynamic_entry (info, DT_PLTREL, DT_REL) | |
3075 | || ! bfd_elf32_add_dynamic_entry (info, DT_JMPREL, 0)) | |
3076 | return false; | |
3077 | } | |
3078 | ||
3079 | if (relocs) | |
3080 | { | |
9b485d32 | 3081 | if ( ! bfd_elf32_add_dynamic_entry (info, DT_REL, 0) |
252b5132 RH |
3082 | || ! bfd_elf32_add_dynamic_entry (info, DT_RELSZ, 0) |
3083 | || ! bfd_elf32_add_dynamic_entry (info, DT_RELENT, | |
3084 | sizeof (Elf32_External_Rel))) | |
3085 | return false; | |
3086 | } | |
3087 | ||
3088 | if (reltext) | |
3089 | { | |
3090 | if (! bfd_elf32_add_dynamic_entry (info, DT_TEXTREL, 0)) | |
3091 | return false; | |
d6cf2879 | 3092 | info->flags |= DF_TEXTREL; |
252b5132 RH |
3093 | } |
3094 | } | |
3095 | ||
3096 | return true; | |
3097 | } | |
3098 | ||
3099 | /* This function is called via elf32_arm_link_hash_traverse if we are | |
3100 | creating a shared object with -Bsymbolic. It discards the space | |
3101 | allocated to copy PC relative relocs against symbols which are | |
3102 | defined in regular objects. We allocated space for them in the | |
3103 | check_relocs routine, but we won't fill them in in the | |
3104 | relocate_section routine. */ | |
3105 | ||
3106 | static boolean | |
3107 | elf32_arm_discard_copies (h, ignore) | |
3108 | struct elf32_arm_link_hash_entry * h; | |
5f771d47 | 3109 | PTR ignore ATTRIBUTE_UNUSED; |
252b5132 RH |
3110 | { |
3111 | struct elf32_arm_pcrel_relocs_copied * s; | |
3112 | ||
3113 | /* We only discard relocs for symbols defined in a regular object. */ | |
3114 | if ((h->root.elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR) == 0) | |
3115 | return true; | |
3116 | ||
3117 | for (s = h->pcrel_relocs_copied; s != NULL; s = s->next) | |
3118 | s->section->_raw_size -= s->count * sizeof (Elf32_External_Rel); | |
3119 | ||
3120 | return true; | |
3121 | } | |
3122 | ||
3123 | /* Finish up dynamic symbol handling. We set the contents of various | |
3124 | dynamic sections here. */ | |
3125 | ||
3126 | static boolean | |
3127 | elf32_arm_finish_dynamic_symbol (output_bfd, info, h, sym) | |
3128 | bfd * output_bfd; | |
3129 | struct bfd_link_info * info; | |
3130 | struct elf_link_hash_entry * h; | |
3131 | Elf_Internal_Sym * sym; | |
3132 | { | |
3133 | bfd * dynobj; | |
3134 | ||
3135 | dynobj = elf_hash_table (info)->dynobj; | |
3136 | ||
3137 | if (h->plt.offset != (bfd_vma) -1) | |
3138 | { | |
3139 | asection * splt; | |
3140 | asection * sgot; | |
3141 | asection * srel; | |
3142 | bfd_vma plt_index; | |
3143 | bfd_vma got_offset; | |
3144 | Elf_Internal_Rel rel; | |
3145 | ||
3146 | /* This symbol has an entry in the procedure linkage table. Set | |
3147 | it up. */ | |
3148 | ||
3149 | BFD_ASSERT (h->dynindx != -1); | |
3150 | ||
3151 | splt = bfd_get_section_by_name (dynobj, ".plt"); | |
3152 | sgot = bfd_get_section_by_name (dynobj, ".got.plt"); | |
3153 | srel = bfd_get_section_by_name (dynobj, ".rel.plt"); | |
3154 | BFD_ASSERT (splt != NULL && sgot != NULL && srel != NULL); | |
3155 | ||
3156 | /* Get the index in the procedure linkage table which | |
3157 | corresponds to this symbol. This is the index of this symbol | |
3158 | in all the symbols for which we are making plt entries. The | |
3159 | first entry in the procedure linkage table is reserved. */ | |
3160 | plt_index = h->plt.offset / PLT_ENTRY_SIZE - 1; | |
3161 | ||
3162 | /* Get the offset into the .got table of the entry that | |
3163 | corresponds to this function. Each .got entry is 4 bytes. | |
3164 | The first three are reserved. */ | |
3165 | got_offset = (plt_index + 3) * 4; | |
3166 | ||
3167 | /* Fill in the entry in the procedure linkage table. */ | |
3168 | memcpy (splt->contents + h->plt.offset, | |
3169 | elf32_arm_plt_entry, | |
3170 | PLT_ENTRY_SIZE); | |
3171 | bfd_put_32 (output_bfd, | |
3172 | (sgot->output_section->vma | |
3173 | + sgot->output_offset | |
f21f3fe0 | 3174 | + got_offset |
252b5132 RH |
3175 | - splt->output_section->vma |
3176 | - splt->output_offset | |
3177 | - h->plt.offset - 12), | |
3178 | splt->contents + h->plt.offset + 12); | |
3179 | ||
3180 | /* Fill in the entry in the global offset table. */ | |
3181 | bfd_put_32 (output_bfd, | |
3182 | (splt->output_section->vma | |
3183 | + splt->output_offset), | |
3184 | sgot->contents + got_offset); | |
3185 | ||
3186 | /* Fill in the entry in the .rel.plt section. */ | |
3187 | rel.r_offset = (sgot->output_section->vma | |
3188 | + sgot->output_offset | |
3189 | + got_offset); | |
3190 | rel.r_info = ELF32_R_INFO (h->dynindx, R_ARM_JUMP_SLOT); | |
3191 | bfd_elf32_swap_reloc_out (output_bfd, &rel, | |
3192 | ((Elf32_External_Rel *) srel->contents | |
3193 | + plt_index)); | |
3194 | ||
3195 | if ((h->elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR) == 0) | |
3196 | { | |
3197 | /* Mark the symbol as undefined, rather than as defined in | |
3198 | the .plt section. Leave the value alone. */ | |
3199 | sym->st_shndx = SHN_UNDEF; | |
d982ba73 PB |
3200 | /* If the symbol is weak, we do need to clear the value. |
3201 | Otherwise, the PLT entry would provide a definition for | |
3202 | the symbol even if the symbol wasn't defined anywhere, | |
3203 | and so the symbol would never be NULL. */ | |
3204 | if ((h->elf_link_hash_flags & ELF_LINK_HASH_REF_REGULAR_NONWEAK) | |
3205 | == 0) | |
3206 | sym->st_value = 0; | |
252b5132 RH |
3207 | } |
3208 | } | |
3209 | ||
3210 | if (h->got.offset != (bfd_vma) -1) | |
3211 | { | |
3212 | asection * sgot; | |
3213 | asection * srel; | |
3214 | Elf_Internal_Rel rel; | |
3215 | ||
3216 | /* This symbol has an entry in the global offset table. Set it | |
3217 | up. */ | |
252b5132 RH |
3218 | sgot = bfd_get_section_by_name (dynobj, ".got"); |
3219 | srel = bfd_get_section_by_name (dynobj, ".rel.got"); | |
3220 | BFD_ASSERT (sgot != NULL && srel != NULL); | |
3221 | ||
3222 | rel.r_offset = (sgot->output_section->vma | |
3223 | + sgot->output_offset | |
3224 | + (h->got.offset &~ 1)); | |
3225 | ||
3226 | /* If this is a -Bsymbolic link, and the symbol is defined | |
3227 | locally, we just want to emit a RELATIVE reloc. The entry in | |
3228 | the global offset table will already have been initialized in | |
3229 | the relocate_section function. */ | |
3230 | if (info->shared | |
3231 | && (info->symbolic || h->dynindx == -1) | |
3232 | && (h->elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR)) | |
3233 | rel.r_info = ELF32_R_INFO (0, R_ARM_RELATIVE); | |
3234 | else | |
3235 | { | |
3236 | bfd_put_32 (output_bfd, (bfd_vma) 0, sgot->contents + h->got.offset); | |
3237 | rel.r_info = ELF32_R_INFO (h->dynindx, R_ARM_GLOB_DAT); | |
3238 | } | |
3239 | ||
3240 | bfd_elf32_swap_reloc_out (output_bfd, &rel, | |
3241 | ((Elf32_External_Rel *) srel->contents | |
3242 | + srel->reloc_count)); | |
3243 | ++srel->reloc_count; | |
3244 | } | |
3245 | ||
3246 | if ((h->elf_link_hash_flags & ELF_LINK_HASH_NEEDS_COPY) != 0) | |
3247 | { | |
3248 | asection * s; | |
3249 | Elf_Internal_Rel rel; | |
3250 | ||
3251 | /* This symbol needs a copy reloc. Set it up. */ | |
252b5132 RH |
3252 | BFD_ASSERT (h->dynindx != -1 |
3253 | && (h->root.type == bfd_link_hash_defined | |
3254 | || h->root.type == bfd_link_hash_defweak)); | |
3255 | ||
3256 | s = bfd_get_section_by_name (h->root.u.def.section->owner, | |
3257 | ".rel.bss"); | |
3258 | BFD_ASSERT (s != NULL); | |
3259 | ||
3260 | rel.r_offset = (h->root.u.def.value | |
3261 | + h->root.u.def.section->output_section->vma | |
3262 | + h->root.u.def.section->output_offset); | |
3263 | rel.r_info = ELF32_R_INFO (h->dynindx, R_ARM_COPY); | |
3264 | bfd_elf32_swap_reloc_out (output_bfd, &rel, | |
3265 | ((Elf32_External_Rel *) s->contents | |
3266 | + s->reloc_count)); | |
3267 | ++s->reloc_count; | |
3268 | } | |
3269 | ||
3270 | /* Mark _DYNAMIC and _GLOBAL_OFFSET_TABLE_ as absolute. */ | |
3271 | if (strcmp (h->root.root.string, "_DYNAMIC") == 0 | |
3272 | || strcmp (h->root.root.string, "_GLOBAL_OFFSET_TABLE_") == 0) | |
3273 | sym->st_shndx = SHN_ABS; | |
3274 | ||
3275 | return true; | |
3276 | } | |
3277 | ||
3278 | /* Finish up the dynamic sections. */ | |
3279 | ||
3280 | static boolean | |
3281 | elf32_arm_finish_dynamic_sections (output_bfd, info) | |
3282 | bfd * output_bfd; | |
3283 | struct bfd_link_info * info; | |
3284 | { | |
3285 | bfd * dynobj; | |
3286 | asection * sgot; | |
3287 | asection * sdyn; | |
3288 | ||
3289 | dynobj = elf_hash_table (info)->dynobj; | |
3290 | ||
3291 | sgot = bfd_get_section_by_name (dynobj, ".got.plt"); | |
3292 | BFD_ASSERT (sgot != NULL); | |
3293 | sdyn = bfd_get_section_by_name (dynobj, ".dynamic"); | |
3294 | ||
3295 | if (elf_hash_table (info)->dynamic_sections_created) | |
3296 | { | |
3297 | asection *splt; | |
3298 | Elf32_External_Dyn *dyncon, *dynconend; | |
3299 | ||
3300 | splt = bfd_get_section_by_name (dynobj, ".plt"); | |
3301 | BFD_ASSERT (splt != NULL && sdyn != NULL); | |
3302 | ||
3303 | dyncon = (Elf32_External_Dyn *) sdyn->contents; | |
3304 | dynconend = (Elf32_External_Dyn *) (sdyn->contents + sdyn->_raw_size); | |
9b485d32 | 3305 | |
252b5132 RH |
3306 | for (; dyncon < dynconend; dyncon++) |
3307 | { | |
3308 | Elf_Internal_Dyn dyn; | |
3309 | const char * name; | |
3310 | asection * s; | |
3311 | ||
3312 | bfd_elf32_swap_dyn_in (dynobj, dyncon, &dyn); | |
3313 | ||
3314 | switch (dyn.d_tag) | |
3315 | { | |
3316 | default: | |
3317 | break; | |
3318 | ||
3319 | case DT_PLTGOT: | |
3320 | name = ".got"; | |
3321 | goto get_vma; | |
3322 | case DT_JMPREL: | |
3323 | name = ".rel.plt"; | |
3324 | get_vma: | |
3325 | s = bfd_get_section_by_name (output_bfd, name); | |
3326 | BFD_ASSERT (s != NULL); | |
3327 | dyn.d_un.d_ptr = s->vma; | |
3328 | bfd_elf32_swap_dyn_out (output_bfd, &dyn, dyncon); | |
3329 | break; | |
3330 | ||
3331 | case DT_PLTRELSZ: | |
3332 | s = bfd_get_section_by_name (output_bfd, ".rel.plt"); | |
3333 | BFD_ASSERT (s != NULL); | |
3334 | if (s->_cooked_size != 0) | |
3335 | dyn.d_un.d_val = s->_cooked_size; | |
3336 | else | |
3337 | dyn.d_un.d_val = s->_raw_size; | |
3338 | bfd_elf32_swap_dyn_out (output_bfd, &dyn, dyncon); | |
3339 | break; | |
3340 | ||
3341 | case DT_RELSZ: | |
3342 | /* My reading of the SVR4 ABI indicates that the | |
3343 | procedure linkage table relocs (DT_JMPREL) should be | |
3344 | included in the overall relocs (DT_REL). This is | |
3345 | what Solaris does. However, UnixWare can not handle | |
3346 | that case. Therefore, we override the DT_RELSZ entry | |
3347 | here to make it not include the JMPREL relocs. Since | |
3348 | the linker script arranges for .rel.plt to follow all | |
3349 | other relocation sections, we don't have to worry | |
3350 | about changing the DT_REL entry. */ | |
3351 | s = bfd_get_section_by_name (output_bfd, ".rel.plt"); | |
3352 | if (s != NULL) | |
3353 | { | |
3354 | if (s->_cooked_size != 0) | |
3355 | dyn.d_un.d_val -= s->_cooked_size; | |
3356 | else | |
3357 | dyn.d_un.d_val -= s->_raw_size; | |
3358 | } | |
3359 | bfd_elf32_swap_dyn_out (output_bfd, &dyn, dyncon); | |
3360 | break; | |
3361 | } | |
3362 | } | |
3363 | ||
3364 | /* Fill in the first entry in the procedure linkage table. */ | |
3365 | if (splt->_raw_size > 0) | |
3366 | memcpy (splt->contents, elf32_arm_plt0_entry, PLT_ENTRY_SIZE); | |
3367 | ||
3368 | /* UnixWare sets the entsize of .plt to 4, although that doesn't | |
3369 | really seem like the right value. */ | |
3370 | elf_section_data (splt->output_section)->this_hdr.sh_entsize = 4; | |
3371 | } | |
3372 | ||
3373 | /* Fill in the first three entries in the global offset table. */ | |
3374 | if (sgot->_raw_size > 0) | |
3375 | { | |
3376 | if (sdyn == NULL) | |
3377 | bfd_put_32 (output_bfd, (bfd_vma) 0, sgot->contents); | |
3378 | else | |
3379 | bfd_put_32 (output_bfd, | |
3380 | sdyn->output_section->vma + sdyn->output_offset, | |
3381 | sgot->contents); | |
3382 | bfd_put_32 (output_bfd, (bfd_vma) 0, sgot->contents + 4); | |
3383 | bfd_put_32 (output_bfd, (bfd_vma) 0, sgot->contents + 8); | |
3384 | } | |
3385 | ||
3386 | elf_section_data (sgot->output_section)->this_hdr.sh_entsize = 4; | |
3387 | ||
3388 | return true; | |
3389 | } | |
3390 | ||
ba96a88f NC |
3391 | static void |
3392 | elf32_arm_post_process_headers (abfd, link_info) | |
3393 | bfd * abfd; | |
5f771d47 | 3394 | struct bfd_link_info * link_info ATTRIBUTE_UNUSED; |
ba96a88f | 3395 | { |
9b485d32 | 3396 | Elf_Internal_Ehdr * i_ehdrp; /* ELF file header, internal form. */ |
ba96a88f NC |
3397 | |
3398 | i_ehdrp = elf_elfheader (abfd); | |
3399 | ||
3400 | i_ehdrp->e_ident[EI_OSABI] = ARM_ELF_OS_ABI_VERSION; | |
3401 | i_ehdrp->e_ident[EI_ABIVERSION] = ARM_ELF_ABI_VERSION; | |
3402 | } | |
3403 | ||
252b5132 RH |
3404 | #define ELF_ARCH bfd_arch_arm |
3405 | #define ELF_MACHINE_CODE EM_ARM | |
f21f3fe0 | 3406 | #define ELF_MAXPAGESIZE 0x8000 |
252b5132 | 3407 | |
252b5132 RH |
3408 | #define bfd_elf32_bfd_copy_private_bfd_data elf32_arm_copy_private_bfd_data |
3409 | #define bfd_elf32_bfd_merge_private_bfd_data elf32_arm_merge_private_bfd_data | |
3410 | #define bfd_elf32_bfd_set_private_flags elf32_arm_set_private_flags | |
3411 | #define bfd_elf32_bfd_print_private_bfd_data elf32_arm_print_private_bfd_data | |
3412 | #define bfd_elf32_bfd_link_hash_table_create elf32_arm_link_hash_table_create | |
3413 | #define bfd_elf32_bfd_reloc_type_lookup elf32_arm_reloc_type_lookup | |
3414 | #define bfd_elf32_find_nearest_line elf32_arm_find_nearest_line | |
3415 | ||
3416 | #define elf_backend_get_symbol_type elf32_arm_get_symbol_type | |
3417 | #define elf_backend_gc_mark_hook elf32_arm_gc_mark_hook | |
3418 | #define elf_backend_gc_sweep_hook elf32_arm_gc_sweep_hook | |
3419 | #define elf_backend_check_relocs elf32_arm_check_relocs | |
3420 | #define elf_backend_relocate_section elf32_arm_relocate_section | |
3421 | #define elf_backend_adjust_dynamic_symbol elf32_arm_adjust_dynamic_symbol | |
3422 | #define elf_backend_create_dynamic_sections _bfd_elf_create_dynamic_sections | |
3423 | #define elf_backend_finish_dynamic_symbol elf32_arm_finish_dynamic_symbol | |
3424 | #define elf_backend_finish_dynamic_sections elf32_arm_finish_dynamic_sections | |
3425 | #define elf_backend_size_dynamic_sections elf32_arm_size_dynamic_sections | |
ba96a88f | 3426 | #define elf_backend_post_process_headers elf32_arm_post_process_headers |
252b5132 RH |
3427 | |
3428 | #define elf_backend_can_gc_sections 1 | |
3429 | #define elf_backend_plt_readonly 1 | |
3430 | #define elf_backend_want_got_plt 1 | |
3431 | #define elf_backend_want_plt_sym 0 | |
3432 | ||
04f7c78d NC |
3433 | #define elf_backend_got_header_size 12 |
3434 | #define elf_backend_plt_header_size PLT_ENTRY_SIZE | |
3435 | ||
252b5132 | 3436 | #include "elf32-target.h" |