Commit | Line | Data |
---|---|---|
252b5132 | 1 | /* 32-bit ELF support for ARM |
ce855c42 | 2 | Copyright 1998, 1999, 2000 Free Software Foundation, Inc. |
252b5132 RH |
3 | |
4 | This file is part of BFD, the Binary File Descriptor library. | |
5 | ||
6 | This program is free software; you can redistribute it and/or modify | |
7 | it under the terms of the GNU General Public License as published by | |
8 | the Free Software Foundation; either version 2 of the License, or | |
9 | (at your option) any later version. | |
10 | ||
11 | This program is distributed in the hope that it will be useful, | |
12 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
13 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
14 | GNU General Public License for more details. | |
15 | ||
16 | You should have received a copy of the GNU General Public License | |
17 | along with this program; if not, write to the Free Software | |
18 | Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */ | |
19 | ||
20 | ||
21 | typedef unsigned long int insn32; | |
22 | typedef unsigned short int insn16; | |
23 | ||
24 | static boolean elf32_arm_set_private_flags | |
25 | PARAMS ((bfd *, flagword)); | |
26 | static boolean elf32_arm_copy_private_bfd_data | |
27 | PARAMS ((bfd *, bfd *)); | |
28 | static boolean elf32_arm_merge_private_bfd_data | |
29 | PARAMS ((bfd *, bfd *)); | |
30 | static boolean elf32_arm_print_private_bfd_data | |
31 | PARAMS ((bfd *, PTR)); | |
f21f3fe0 | 32 | static int elf32_arm_get_symbol_type |
252b5132 RH |
33 | PARAMS (( Elf_Internal_Sym *, int)); |
34 | static struct bfd_link_hash_table *elf32_arm_link_hash_table_create | |
35 | PARAMS ((bfd *)); | |
36 | static bfd_reloc_status_type elf32_arm_final_link_relocate | |
780a67af NC |
37 | PARAMS ((reloc_howto_type *, bfd *, bfd *, asection *, bfd_byte *, |
38 | Elf_Internal_Rela *, bfd_vma, struct bfd_link_info *, asection *, | |
39 | const char *, unsigned char, struct elf_link_hash_entry *)); | |
252b5132 RH |
40 | static insn32 insert_thumb_branch |
41 | PARAMS ((insn32, int)); | |
42 | static struct elf_link_hash_entry *find_thumb_glue | |
43 | PARAMS ((struct bfd_link_info *, CONST char *, bfd *)); | |
44 | static struct elf_link_hash_entry *find_arm_glue | |
45 | PARAMS ((struct bfd_link_info *, CONST char *, bfd *)); | |
46 | static void record_arm_to_thumb_glue | |
47 | PARAMS ((struct bfd_link_info *, struct elf_link_hash_entry *)); | |
48 | static void record_thumb_to_arm_glue | |
49 | PARAMS ((struct bfd_link_info *, struct elf_link_hash_entry *)); | |
ba96a88f NC |
50 | static void elf32_arm_post_process_headers |
51 | PARAMS ((bfd *, struct bfd_link_info *)); | |
bcbdc74c NC |
52 | static int elf32_arm_to_thumb_stub |
53 | PARAMS ((struct bfd_link_info *, const char *, bfd *, bfd *, asection *, | |
54 | bfd_byte *, asection *, bfd_vma, bfd_signed_vma, bfd_vma)); | |
55 | static int elf32_thumb_to_arm_stub | |
56 | PARAMS ((struct bfd_link_info *, const char *, bfd *, bfd *, asection *, | |
57 | bfd_byte *, asection *, bfd_vma, bfd_signed_vma, bfd_vma)); | |
252b5132 | 58 | |
9b485d32 NC |
59 | #define INTERWORK_FLAG(abfd) (elf_elfheader (abfd)->e_flags & EF_INTERWORK) |
60 | ||
252b5132 RH |
61 | /* The linker script knows the section names for placement. |
62 | The entry_names are used to do simple name mangling on the stubs. | |
63 | Given a function name, and its type, the stub can be found. The | |
9b485d32 | 64 | name can be changed. The only requirement is the %s be present. */ |
252b5132 RH |
65 | #define THUMB2ARM_GLUE_SECTION_NAME ".glue_7t" |
66 | #define THUMB2ARM_GLUE_ENTRY_NAME "__%s_from_thumb" | |
67 | ||
68 | #define ARM2THUMB_GLUE_SECTION_NAME ".glue_7" | |
69 | #define ARM2THUMB_GLUE_ENTRY_NAME "__%s_from_arm" | |
70 | ||
71 | /* The name of the dynamic interpreter. This is put in the .interp | |
72 | section. */ | |
73 | #define ELF_DYNAMIC_INTERPRETER "/usr/lib/ld.so.1" | |
74 | ||
75 | /* The size in bytes of an entry in the procedure linkage table. */ | |
252b5132 RH |
76 | #define PLT_ENTRY_SIZE 16 |
77 | ||
78 | /* The first entry in a procedure linkage table looks like | |
79 | this. It is set up so that any shared library function that is | |
59f2c4e7 | 80 | called before the relocation has been set up calls the dynamic |
9b485d32 | 81 | linker first. */ |
252b5132 RH |
82 | static const bfd_byte elf32_arm_plt0_entry [PLT_ENTRY_SIZE] = |
83 | { | |
84 | 0x04, 0xe0, 0x2d, 0xe5, /* str lr, [sp, #-4]! */ | |
85 | 0x10, 0xe0, 0x9f, 0xe5, /* ldr lr, [pc, #16] */ | |
86 | 0x0e, 0xe0, 0x8f, 0xe0, /* adr lr, pc, lr */ | |
59f2c4e7 | 87 | 0x08, 0xf0, 0xbe, 0xe5 /* ldr pc, [lr, #8]! */ |
252b5132 RH |
88 | }; |
89 | ||
90 | /* Subsequent entries in a procedure linkage table look like | |
91 | this. */ | |
252b5132 RH |
92 | static const bfd_byte elf32_arm_plt_entry [PLT_ENTRY_SIZE] = |
93 | { | |
94 | 0x04, 0xc0, 0x9f, 0xe5, /* ldr ip, [pc, #4] */ | |
95 | 0x0c, 0xc0, 0x8f, 0xe0, /* add ip, pc, ip */ | |
96 | 0x00, 0xf0, 0x9c, 0xe5, /* ldr pc, [ip] */ | |
97 | 0x00, 0x00, 0x00, 0x00 /* offset to symbol in got */ | |
98 | }; | |
99 | ||
252b5132 RH |
100 | /* The ARM linker needs to keep track of the number of relocs that it |
101 | decides to copy in check_relocs for each symbol. This is so that | |
102 | it can discard PC relative relocs if it doesn't need them when | |
103 | linking with -Bsymbolic. We store the information in a field | |
104 | extending the regular ELF linker hash table. */ | |
105 | ||
106 | /* This structure keeps track of the number of PC relative relocs we | |
107 | have copied for a given symbol. */ | |
252b5132 RH |
108 | struct elf32_arm_pcrel_relocs_copied |
109 | { | |
110 | /* Next section. */ | |
111 | struct elf32_arm_pcrel_relocs_copied * next; | |
112 | /* A section in dynobj. */ | |
113 | asection * section; | |
114 | /* Number of relocs copied in this section. */ | |
115 | bfd_size_type count; | |
116 | }; | |
117 | ||
ba96a88f | 118 | /* Arm ELF linker hash entry. */ |
252b5132 RH |
119 | struct elf32_arm_link_hash_entry |
120 | { | |
121 | struct elf_link_hash_entry root; | |
122 | ||
123 | /* Number of PC relative relocs copied for this symbol. */ | |
124 | struct elf32_arm_pcrel_relocs_copied * pcrel_relocs_copied; | |
125 | }; | |
126 | ||
127 | /* Declare this now that the above structures are defined. */ | |
252b5132 RH |
128 | static boolean elf32_arm_discard_copies |
129 | PARAMS ((struct elf32_arm_link_hash_entry *, PTR)); | |
130 | ||
131 | /* Traverse an arm ELF linker hash table. */ | |
252b5132 RH |
132 | #define elf32_arm_link_hash_traverse(table, func, info) \ |
133 | (elf_link_hash_traverse \ | |
134 | (&(table)->root, \ | |
135 | (boolean (*) PARAMS ((struct elf_link_hash_entry *, PTR))) (func), \ | |
136 | (info))) | |
137 | ||
138 | /* Get the ARM elf linker hash table from a link_info structure. */ | |
139 | #define elf32_arm_hash_table(info) \ | |
140 | ((struct elf32_arm_link_hash_table *) ((info)->hash)) | |
141 | ||
9b485d32 | 142 | /* ARM ELF linker hash table. */ |
252b5132 | 143 | struct elf32_arm_link_hash_table |
9b485d32 NC |
144 | { |
145 | /* The main hash table. */ | |
146 | struct elf_link_hash_table root; | |
252b5132 | 147 | |
9b485d32 NC |
148 | /* The size in bytes of the section containg the Thumb-to-ARM glue. */ |
149 | long int thumb_glue_size; | |
252b5132 | 150 | |
9b485d32 NC |
151 | /* The size in bytes of the section containg the ARM-to-Thumb glue. */ |
152 | long int arm_glue_size; | |
252b5132 | 153 | |
9b485d32 NC |
154 | /* An arbitary input BFD chosen to hold the glue sections. */ |
155 | bfd * bfd_of_glue_owner; | |
ba96a88f | 156 | |
9b485d32 NC |
157 | /* A boolean indicating whether knowledge of the ARM's pipeline |
158 | length should be applied by the linker. */ | |
159 | int no_pipeline_knowledge; | |
160 | }; | |
252b5132 RH |
161 | |
162 | ||
780a67af NC |
163 | /* Create an entry in an ARM ELF linker hash table. */ |
164 | ||
165 | static struct bfd_hash_entry * | |
166 | elf32_arm_link_hash_newfunc (entry, table, string) | |
167 | struct bfd_hash_entry * entry; | |
168 | struct bfd_hash_table * table; | |
169 | const char * string; | |
170 | { | |
171 | struct elf32_arm_link_hash_entry * ret = | |
172 | (struct elf32_arm_link_hash_entry *) entry; | |
173 | ||
174 | /* Allocate the structure if it has not already been allocated by a | |
175 | subclass. */ | |
176 | if (ret == (struct elf32_arm_link_hash_entry *) NULL) | |
177 | ret = ((struct elf32_arm_link_hash_entry *) | |
178 | bfd_hash_allocate (table, | |
179 | sizeof (struct elf32_arm_link_hash_entry))); | |
180 | if (ret == (struct elf32_arm_link_hash_entry *) NULL) | |
181 | return (struct bfd_hash_entry *) ret; | |
182 | ||
183 | /* Call the allocation method of the superclass. */ | |
184 | ret = ((struct elf32_arm_link_hash_entry *) | |
185 | _bfd_elf_link_hash_newfunc ((struct bfd_hash_entry *) ret, | |
186 | table, string)); | |
187 | if (ret != (struct elf32_arm_link_hash_entry *) NULL) | |
188 | ret->pcrel_relocs_copied = NULL; | |
189 | ||
190 | return (struct bfd_hash_entry *) ret; | |
191 | } | |
192 | ||
9b485d32 | 193 | /* Create an ARM elf linker hash table. */ |
252b5132 RH |
194 | |
195 | static struct bfd_link_hash_table * | |
196 | elf32_arm_link_hash_table_create (abfd) | |
197 | bfd *abfd; | |
198 | { | |
199 | struct elf32_arm_link_hash_table *ret; | |
200 | ||
201 | ret = ((struct elf32_arm_link_hash_table *) | |
202 | bfd_alloc (abfd, sizeof (struct elf32_arm_link_hash_table))); | |
203 | if (ret == (struct elf32_arm_link_hash_table *) NULL) | |
204 | return NULL; | |
205 | ||
206 | if (!_bfd_elf_link_hash_table_init (&ret->root, abfd, | |
780a67af | 207 | elf32_arm_link_hash_newfunc)) |
252b5132 RH |
208 | { |
209 | bfd_release (abfd, ret); | |
210 | return NULL; | |
211 | } | |
212 | ||
213 | ret->thumb_glue_size = 0; | |
214 | ret->arm_glue_size = 0; | |
215 | ret->bfd_of_glue_owner = NULL; | |
ba96a88f | 216 | ret->no_pipeline_knowledge = 0; |
252b5132 RH |
217 | |
218 | return &ret->root.root; | |
219 | } | |
220 | ||
9b485d32 NC |
221 | /* Locate the Thumb encoded calling stub for NAME. */ |
222 | ||
252b5132 RH |
223 | static struct elf_link_hash_entry * |
224 | find_thumb_glue (link_info, name, input_bfd) | |
225 | struct bfd_link_info *link_info; | |
226 | CONST char *name; | |
227 | bfd *input_bfd; | |
228 | { | |
229 | char *tmp_name; | |
230 | struct elf_link_hash_entry *hash; | |
231 | struct elf32_arm_link_hash_table *hash_table; | |
232 | ||
233 | /* We need a pointer to the armelf specific hash table. */ | |
234 | hash_table = elf32_arm_hash_table (link_info); | |
235 | ||
252b5132 RH |
236 | tmp_name = ((char *) |
237 | bfd_malloc (strlen (name) + strlen (THUMB2ARM_GLUE_ENTRY_NAME) + 1)); | |
238 | ||
239 | BFD_ASSERT (tmp_name); | |
240 | ||
241 | sprintf (tmp_name, THUMB2ARM_GLUE_ENTRY_NAME, name); | |
242 | ||
243 | hash = elf_link_hash_lookup | |
244 | (&(hash_table)->root, tmp_name, false, false, true); | |
245 | ||
246 | if (hash == NULL) | |
247 | /* xgettext:c-format */ | |
9b485d32 | 248 | _bfd_error_handler (_("%s: unable to find THUMB glue '%s' for `%s'"), |
252b5132 RH |
249 | bfd_get_filename (input_bfd), tmp_name, name); |
250 | ||
251 | free (tmp_name); | |
252 | ||
253 | return hash; | |
254 | } | |
255 | ||
9b485d32 NC |
256 | /* Locate the ARM encoded calling stub for NAME. */ |
257 | ||
252b5132 RH |
258 | static struct elf_link_hash_entry * |
259 | find_arm_glue (link_info, name, input_bfd) | |
260 | struct bfd_link_info *link_info; | |
261 | CONST char *name; | |
262 | bfd *input_bfd; | |
263 | { | |
264 | char *tmp_name; | |
265 | struct elf_link_hash_entry *myh; | |
266 | struct elf32_arm_link_hash_table *hash_table; | |
267 | ||
268 | /* We need a pointer to the elfarm specific hash table. */ | |
269 | hash_table = elf32_arm_hash_table (link_info); | |
270 | ||
271 | tmp_name = ((char *) | |
272 | bfd_malloc (strlen (name) + strlen (ARM2THUMB_GLUE_ENTRY_NAME) + 1)); | |
273 | ||
274 | BFD_ASSERT (tmp_name); | |
275 | ||
276 | sprintf (tmp_name, ARM2THUMB_GLUE_ENTRY_NAME, name); | |
277 | ||
278 | myh = elf_link_hash_lookup | |
279 | (&(hash_table)->root, tmp_name, false, false, true); | |
280 | ||
281 | if (myh == NULL) | |
282 | /* xgettext:c-format */ | |
9b485d32 | 283 | _bfd_error_handler (_("%s: unable to find ARM glue '%s' for `%s'"), |
252b5132 RH |
284 | bfd_get_filename (input_bfd), tmp_name, name); |
285 | ||
286 | free (tmp_name); | |
287 | ||
288 | return myh; | |
289 | } | |
290 | ||
9b485d32 | 291 | /* ARM->Thumb glue: |
252b5132 RH |
292 | |
293 | .arm | |
294 | __func_from_arm: | |
295 | ldr r12, __func_addr | |
296 | bx r12 | |
297 | __func_addr: | |
9b485d32 | 298 | .word func @ behave as if you saw a ARM_32 reloc. */ |
252b5132 RH |
299 | |
300 | #define ARM2THUMB_GLUE_SIZE 12 | |
301 | static const insn32 a2t1_ldr_insn = 0xe59fc000; | |
302 | static const insn32 a2t2_bx_r12_insn = 0xe12fff1c; | |
303 | static const insn32 a2t3_func_addr_insn = 0x00000001; | |
304 | ||
9b485d32 | 305 | /* Thumb->ARM: Thumb->(non-interworking aware) ARM |
252b5132 RH |
306 | |
307 | .thumb .thumb | |
308 | .align 2 .align 2 | |
309 | __func_from_thumb: __func_from_thumb: | |
310 | bx pc push {r6, lr} | |
311 | nop ldr r6, __func_addr | |
312 | .arm mov lr, pc | |
313 | __func_change_to_arm: bx r6 | |
314 | b func .arm | |
315 | __func_back_to_thumb: | |
316 | ldmia r13! {r6, lr} | |
317 | bx lr | |
318 | __func_addr: | |
9b485d32 | 319 | .word func */ |
252b5132 RH |
320 | |
321 | #define THUMB2ARM_GLUE_SIZE 8 | |
322 | static const insn16 t2a1_bx_pc_insn = 0x4778; | |
323 | static const insn16 t2a2_noop_insn = 0x46c0; | |
324 | static const insn32 t2a3_b_insn = 0xea000000; | |
325 | ||
326 | static const insn16 t2a1_push_insn = 0xb540; | |
327 | static const insn16 t2a2_ldr_insn = 0x4e03; | |
328 | static const insn16 t2a3_mov_insn = 0x46fe; | |
329 | static const insn16 t2a4_bx_insn = 0x4730; | |
330 | static const insn32 t2a5_pop_insn = 0xe8bd4040; | |
331 | static const insn32 t2a6_bx_insn = 0xe12fff1e; | |
332 | ||
333 | boolean | |
334 | bfd_elf32_arm_allocate_interworking_sections (info) | |
335 | struct bfd_link_info * info; | |
336 | { | |
337 | asection * s; | |
338 | bfd_byte * foo; | |
339 | struct elf32_arm_link_hash_table * globals; | |
340 | ||
341 | globals = elf32_arm_hash_table (info); | |
342 | ||
343 | BFD_ASSERT (globals != NULL); | |
344 | ||
345 | if (globals->arm_glue_size != 0) | |
346 | { | |
347 | BFD_ASSERT (globals->bfd_of_glue_owner != NULL); | |
348 | ||
349 | s = bfd_get_section_by_name | |
350 | (globals->bfd_of_glue_owner, ARM2THUMB_GLUE_SECTION_NAME); | |
351 | ||
352 | BFD_ASSERT (s != NULL); | |
353 | ||
354 | foo = (bfd_byte *) bfd_alloc | |
355 | (globals->bfd_of_glue_owner, globals->arm_glue_size); | |
356 | ||
357 | s->_raw_size = s->_cooked_size = globals->arm_glue_size; | |
358 | s->contents = foo; | |
359 | } | |
360 | ||
361 | if (globals->thumb_glue_size != 0) | |
362 | { | |
363 | BFD_ASSERT (globals->bfd_of_glue_owner != NULL); | |
364 | ||
365 | s = bfd_get_section_by_name | |
366 | (globals->bfd_of_glue_owner, THUMB2ARM_GLUE_SECTION_NAME); | |
367 | ||
368 | BFD_ASSERT (s != NULL); | |
369 | ||
370 | foo = (bfd_byte *) bfd_alloc | |
371 | (globals->bfd_of_glue_owner, globals->thumb_glue_size); | |
372 | ||
373 | s->_raw_size = s->_cooked_size = globals->thumb_glue_size; | |
374 | s->contents = foo; | |
375 | } | |
376 | ||
377 | return true; | |
378 | } | |
379 | ||
380 | static void | |
381 | record_arm_to_thumb_glue (link_info, h) | |
382 | struct bfd_link_info * link_info; | |
383 | struct elf_link_hash_entry * h; | |
384 | { | |
385 | const char * name = h->root.root.string; | |
386 | register asection * s; | |
387 | char * tmp_name; | |
388 | struct elf_link_hash_entry * myh; | |
389 | struct elf32_arm_link_hash_table * globals; | |
390 | ||
391 | globals = elf32_arm_hash_table (link_info); | |
392 | ||
393 | BFD_ASSERT (globals != NULL); | |
394 | BFD_ASSERT (globals->bfd_of_glue_owner != NULL); | |
395 | ||
396 | s = bfd_get_section_by_name | |
397 | (globals->bfd_of_glue_owner, ARM2THUMB_GLUE_SECTION_NAME); | |
398 | ||
252b5132 RH |
399 | BFD_ASSERT (s != NULL); |
400 | ||
401 | tmp_name = ((char *) | |
402 | bfd_malloc (strlen (name) + strlen (ARM2THUMB_GLUE_ENTRY_NAME) + 1)); | |
403 | ||
404 | BFD_ASSERT (tmp_name); | |
405 | ||
406 | sprintf (tmp_name, ARM2THUMB_GLUE_ENTRY_NAME, name); | |
407 | ||
408 | myh = elf_link_hash_lookup | |
409 | (&(globals)->root, tmp_name, false, false, true); | |
410 | ||
411 | if (myh != NULL) | |
412 | { | |
9b485d32 | 413 | /* We've already seen this guy. */ |
252b5132 | 414 | free (tmp_name); |
9b485d32 | 415 | return; |
252b5132 RH |
416 | } |
417 | ||
418 | /* The only trick here is using hash_table->arm_glue_size as the value. Even | |
419 | though the section isn't allocated yet, this is where we will be putting | |
420 | it. */ | |
252b5132 RH |
421 | _bfd_generic_link_add_one_symbol (link_info, globals->bfd_of_glue_owner, tmp_name, |
422 | BSF_GLOBAL, | |
423 | s, globals->arm_glue_size + 1, | |
424 | NULL, true, false, | |
425 | (struct bfd_link_hash_entry **) &myh); | |
426 | ||
427 | free (tmp_name); | |
428 | ||
429 | globals->arm_glue_size += ARM2THUMB_GLUE_SIZE; | |
430 | ||
431 | return; | |
432 | } | |
433 | ||
434 | static void | |
435 | record_thumb_to_arm_glue (link_info, h) | |
436 | struct bfd_link_info *link_info; | |
437 | struct elf_link_hash_entry *h; | |
438 | { | |
439 | const char *name = h->root.root.string; | |
440 | register asection *s; | |
441 | char *tmp_name; | |
442 | struct elf_link_hash_entry *myh; | |
443 | struct elf32_arm_link_hash_table *hash_table; | |
444 | char bind; | |
445 | ||
446 | hash_table = elf32_arm_hash_table (link_info); | |
447 | ||
448 | BFD_ASSERT (hash_table != NULL); | |
449 | BFD_ASSERT (hash_table->bfd_of_glue_owner != NULL); | |
450 | ||
451 | s = bfd_get_section_by_name | |
452 | (hash_table->bfd_of_glue_owner, THUMB2ARM_GLUE_SECTION_NAME); | |
453 | ||
454 | BFD_ASSERT (s != NULL); | |
455 | ||
456 | tmp_name = (char *) bfd_malloc (strlen (name) + strlen (THUMB2ARM_GLUE_ENTRY_NAME) + 1); | |
457 | ||
458 | BFD_ASSERT (tmp_name); | |
459 | ||
460 | sprintf (tmp_name, THUMB2ARM_GLUE_ENTRY_NAME, name); | |
461 | ||
462 | myh = elf_link_hash_lookup | |
463 | (&(hash_table)->root, tmp_name, false, false, true); | |
464 | ||
465 | if (myh != NULL) | |
466 | { | |
9b485d32 | 467 | /* We've already seen this guy. */ |
252b5132 | 468 | free (tmp_name); |
9b485d32 | 469 | return; |
252b5132 RH |
470 | } |
471 | ||
472 | _bfd_generic_link_add_one_symbol (link_info, hash_table->bfd_of_glue_owner, tmp_name, | |
473 | BSF_GLOBAL, s, hash_table->thumb_glue_size + 1, | |
474 | NULL, true, false, | |
475 | (struct bfd_link_hash_entry **) &myh); | |
476 | ||
9b485d32 | 477 | /* If we mark it 'Thumb', the disassembler will do a better job. */ |
252b5132 RH |
478 | bind = ELF_ST_BIND (myh->type); |
479 | myh->type = ELF_ST_INFO (bind, STT_ARM_TFUNC); | |
480 | ||
481 | free (tmp_name); | |
482 | ||
252b5132 RH |
483 | #define CHANGE_TO_ARM "__%s_change_to_arm" |
484 | #define BACK_FROM_ARM "__%s_back_from_arm" | |
485 | ||
9b485d32 | 486 | /* Allocate another symbol to mark where we switch to Arm mode. */ |
252b5132 RH |
487 | tmp_name = (char *) bfd_malloc (strlen (name) + strlen (CHANGE_TO_ARM) + 1); |
488 | ||
489 | BFD_ASSERT (tmp_name); | |
490 | ||
491 | sprintf (tmp_name, CHANGE_TO_ARM, name); | |
492 | ||
493 | myh = NULL; | |
494 | ||
495 | _bfd_generic_link_add_one_symbol (link_info, hash_table->bfd_of_glue_owner, tmp_name, | |
496 | BSF_LOCAL, s, hash_table->thumb_glue_size + 4, | |
497 | NULL, true, false, | |
498 | (struct bfd_link_hash_entry **) &myh); | |
499 | ||
500 | free (tmp_name); | |
501 | ||
502 | hash_table->thumb_glue_size += THUMB2ARM_GLUE_SIZE; | |
503 | ||
504 | return; | |
505 | } | |
506 | ||
507 | /* Select a BFD to be used to hold the sections used by the glue code. | |
508 | This function is called from the linker scripts in ld/emultempl/ | |
509 | {armelf/pe}.em */ | |
9b485d32 | 510 | |
252b5132 RH |
511 | boolean |
512 | bfd_elf32_arm_get_bfd_for_interworking (abfd, info) | |
513 | bfd *abfd; | |
514 | struct bfd_link_info *info; | |
515 | { | |
516 | struct elf32_arm_link_hash_table *globals; | |
517 | flagword flags; | |
518 | asection *sec; | |
519 | ||
520 | /* If we are only performing a partial link do not bother | |
521 | getting a bfd to hold the glue. */ | |
522 | if (info->relocateable) | |
523 | return true; | |
524 | ||
525 | globals = elf32_arm_hash_table (info); | |
526 | ||
527 | BFD_ASSERT (globals != NULL); | |
528 | ||
529 | if (globals->bfd_of_glue_owner != NULL) | |
530 | return true; | |
531 | ||
532 | sec = bfd_get_section_by_name (abfd, ARM2THUMB_GLUE_SECTION_NAME); | |
533 | ||
534 | if (sec == NULL) | |
535 | { | |
57db232e NC |
536 | /* Note: we do not include the flag SEC_LINKER_CREATED, as this |
537 | will prevent elf_link_input_bfd() from processing the contents | |
538 | of this section. */ | |
811b4bf6 | 539 | flags = SEC_ALLOC | SEC_LOAD | SEC_HAS_CONTENTS | SEC_IN_MEMORY | SEC_CODE | SEC_READONLY; |
252b5132 RH |
540 | |
541 | sec = bfd_make_section (abfd, ARM2THUMB_GLUE_SECTION_NAME); | |
542 | ||
543 | if (sec == NULL | |
544 | || !bfd_set_section_flags (abfd, sec, flags) | |
545 | || !bfd_set_section_alignment (abfd, sec, 2)) | |
546 | return false; | |
9a5aca8c | 547 | |
57db232e NC |
548 | /* Set the gc mark to prevent the section from being removed by garbage |
549 | collection, despite the fact that no relocs refer to this section. */ | |
550 | sec->gc_mark = 1; | |
252b5132 RH |
551 | } |
552 | ||
553 | sec = bfd_get_section_by_name (abfd, THUMB2ARM_GLUE_SECTION_NAME); | |
554 | ||
555 | if (sec == NULL) | |
556 | { | |
811b4bf6 | 557 | flags = SEC_ALLOC | SEC_LOAD | SEC_HAS_CONTENTS | SEC_IN_MEMORY | SEC_CODE | SEC_READONLY; |
252b5132 RH |
558 | |
559 | sec = bfd_make_section (abfd, THUMB2ARM_GLUE_SECTION_NAME); | |
560 | ||
561 | if (sec == NULL | |
562 | || !bfd_set_section_flags (abfd, sec, flags) | |
563 | || !bfd_set_section_alignment (abfd, sec, 2)) | |
564 | return false; | |
9a5aca8c | 565 | |
57db232e | 566 | sec->gc_mark = 1; |
252b5132 RH |
567 | } |
568 | ||
569 | /* Save the bfd for later use. */ | |
570 | globals->bfd_of_glue_owner = abfd; | |
571 | ||
572 | return true; | |
573 | } | |
574 | ||
575 | boolean | |
ba96a88f | 576 | bfd_elf32_arm_process_before_allocation (abfd, link_info, no_pipeline_knowledge) |
252b5132 RH |
577 | bfd *abfd; |
578 | struct bfd_link_info *link_info; | |
ba96a88f | 579 | int no_pipeline_knowledge; |
252b5132 RH |
580 | { |
581 | Elf_Internal_Shdr *symtab_hdr; | |
582 | Elf_Internal_Rela *free_relocs = NULL; | |
583 | Elf_Internal_Rela *irel, *irelend; | |
584 | bfd_byte *contents = NULL; | |
585 | bfd_byte *free_contents = NULL; | |
586 | Elf32_External_Sym *extsyms = NULL; | |
587 | Elf32_External_Sym *free_extsyms = NULL; | |
588 | ||
589 | asection *sec; | |
590 | struct elf32_arm_link_hash_table *globals; | |
591 | ||
592 | /* If we are only performing a partial link do not bother | |
593 | to construct any glue. */ | |
594 | if (link_info->relocateable) | |
595 | return true; | |
596 | ||
597 | /* Here we have a bfd that is to be included on the link. We have a hook | |
598 | to do reloc rummaging, before section sizes are nailed down. */ | |
252b5132 RH |
599 | globals = elf32_arm_hash_table (link_info); |
600 | ||
601 | BFD_ASSERT (globals != NULL); | |
602 | BFD_ASSERT (globals->bfd_of_glue_owner != NULL); | |
603 | ||
ba96a88f | 604 | globals->no_pipeline_knowledge = no_pipeline_knowledge; |
f21f3fe0 | 605 | |
252b5132 RH |
606 | /* Rummage around all the relocs and map the glue vectors. */ |
607 | sec = abfd->sections; | |
608 | ||
609 | if (sec == NULL) | |
610 | return true; | |
611 | ||
612 | for (; sec != NULL; sec = sec->next) | |
613 | { | |
614 | if (sec->reloc_count == 0) | |
615 | continue; | |
616 | ||
617 | symtab_hdr = &elf_tdata (abfd)->symtab_hdr; | |
252b5132 | 618 | |
9b485d32 | 619 | /* Load the relocs. */ |
252b5132 RH |
620 | irel = (_bfd_elf32_link_read_relocs (abfd, sec, (PTR) NULL, |
621 | (Elf_Internal_Rela *) NULL, false)); | |
622 | ||
623 | BFD_ASSERT (irel != 0); | |
624 | ||
625 | irelend = irel + sec->reloc_count; | |
626 | for (; irel < irelend; irel++) | |
627 | { | |
628 | long r_type; | |
629 | unsigned long r_index; | |
252b5132 RH |
630 | |
631 | struct elf_link_hash_entry *h; | |
632 | ||
633 | r_type = ELF32_R_TYPE (irel->r_info); | |
634 | r_index = ELF32_R_SYM (irel->r_info); | |
635 | ||
9b485d32 | 636 | /* These are the only relocation types we care about. */ |
ba96a88f | 637 | if ( r_type != R_ARM_PC24 |
252b5132 RH |
638 | && r_type != R_ARM_THM_PC22) |
639 | continue; | |
640 | ||
641 | /* Get the section contents if we haven't done so already. */ | |
642 | if (contents == NULL) | |
643 | { | |
644 | /* Get cached copy if it exists. */ | |
645 | if (elf_section_data (sec)->this_hdr.contents != NULL) | |
646 | contents = elf_section_data (sec)->this_hdr.contents; | |
647 | else | |
648 | { | |
649 | /* Go get them off disk. */ | |
650 | contents = (bfd_byte *) bfd_malloc (sec->_raw_size); | |
651 | if (contents == NULL) | |
652 | goto error_return; | |
9b485d32 | 653 | |
252b5132 RH |
654 | free_contents = contents; |
655 | ||
656 | if (!bfd_get_section_contents (abfd, sec, contents, | |
657 | (file_ptr) 0, sec->_raw_size)) | |
658 | goto error_return; | |
659 | } | |
660 | } | |
661 | ||
662 | /* Read this BFD's symbols if we haven't done so already. */ | |
663 | if (extsyms == NULL) | |
664 | { | |
665 | /* Get cached copy if it exists. */ | |
666 | if (symtab_hdr->contents != NULL) | |
667 | extsyms = (Elf32_External_Sym *) symtab_hdr->contents; | |
668 | else | |
669 | { | |
670 | /* Go get them off disk. */ | |
671 | extsyms = ((Elf32_External_Sym *) | |
672 | bfd_malloc (symtab_hdr->sh_size)); | |
673 | if (extsyms == NULL) | |
674 | goto error_return; | |
9b485d32 | 675 | |
252b5132 | 676 | free_extsyms = extsyms; |
9b485d32 | 677 | |
252b5132 RH |
678 | if (bfd_seek (abfd, symtab_hdr->sh_offset, SEEK_SET) != 0 |
679 | || (bfd_read (extsyms, 1, symtab_hdr->sh_size, abfd) | |
680 | != symtab_hdr->sh_size)) | |
681 | goto error_return; | |
682 | } | |
683 | } | |
684 | ||
685 | /* If the relocation is not against a symbol it cannot concern us. */ | |
252b5132 RH |
686 | h = NULL; |
687 | ||
9b485d32 | 688 | /* We don't care about local symbols. */ |
252b5132 RH |
689 | if (r_index < symtab_hdr->sh_info) |
690 | continue; | |
691 | ||
9b485d32 | 692 | /* This is an external symbol. */ |
252b5132 RH |
693 | r_index -= symtab_hdr->sh_info; |
694 | h = (struct elf_link_hash_entry *) | |
695 | elf_sym_hashes (abfd)[r_index]; | |
696 | ||
697 | /* If the relocation is against a static symbol it must be within | |
698 | the current section and so cannot be a cross ARM/Thumb relocation. */ | |
699 | if (h == NULL) | |
700 | continue; | |
701 | ||
702 | switch (r_type) | |
703 | { | |
704 | case R_ARM_PC24: | |
705 | /* This one is a call from arm code. We need to look up | |
2f0ca46a | 706 | the target of the call. If it is a thumb target, we |
252b5132 | 707 | insert glue. */ |
252b5132 RH |
708 | if (ELF_ST_TYPE(h->type) == STT_ARM_TFUNC) |
709 | record_arm_to_thumb_glue (link_info, h); | |
710 | break; | |
711 | ||
712 | case R_ARM_THM_PC22: | |
f21f3fe0 | 713 | /* This one is a call from thumb code. We look |
2f0ca46a | 714 | up the target of the call. If it is not a thumb |
bcbdc74c | 715 | target, we insert glue. */ |
252b5132 RH |
716 | if (ELF_ST_TYPE (h->type) != STT_ARM_TFUNC) |
717 | record_thumb_to_arm_glue (link_info, h); | |
718 | break; | |
719 | ||
720 | default: | |
721 | break; | |
722 | } | |
723 | } | |
724 | } | |
725 | ||
726 | return true; | |
9a5aca8c | 727 | |
252b5132 RH |
728 | error_return: |
729 | if (free_relocs != NULL) | |
730 | free (free_relocs); | |
731 | if (free_contents != NULL) | |
732 | free (free_contents); | |
733 | if (free_extsyms != NULL) | |
734 | free (free_extsyms); | |
9a5aca8c | 735 | |
252b5132 | 736 | return false; |
252b5132 RH |
737 | } |
738 | ||
739 | /* The thumb form of a long branch is a bit finicky, because the offset | |
740 | encoding is split over two fields, each in it's own instruction. They | |
f21f3fe0 | 741 | can occur in any order. So given a thumb form of long branch, and an |
252b5132 | 742 | offset, insert the offset into the thumb branch and return finished |
f21f3fe0 | 743 | instruction. |
252b5132 | 744 | |
f21f3fe0 | 745 | It takes two thumb instructions to encode the target address. Each has |
252b5132 | 746 | 11 bits to invest. The upper 11 bits are stored in one (identifed by |
f21f3fe0 UD |
747 | H-0.. see below), the lower 11 bits are stored in the other (identified |
748 | by H-1). | |
252b5132 | 749 | |
f21f3fe0 | 750 | Combine together and shifted left by 1 (it's a half word address) and |
252b5132 RH |
751 | there you have it. |
752 | ||
753 | Op: 1111 = F, | |
754 | H-0, upper address-0 = 000 | |
755 | Op: 1111 = F, | |
756 | H-1, lower address-0 = 800 | |
757 | ||
f21f3fe0 | 758 | They can be ordered either way, but the arm tools I've seen always put |
252b5132 RH |
759 | the lower one first. It probably doesn't matter. krk@cygnus.com |
760 | ||
761 | XXX: Actually the order does matter. The second instruction (H-1) | |
762 | moves the computed address into the PC, so it must be the second one | |
763 | in the sequence. The problem, however is that whilst little endian code | |
764 | stores the instructions in HI then LOW order, big endian code does the | |
dfc5f959 | 765 | reverse. nickc@cygnus.com. */ |
252b5132 | 766 | |
dfc5f959 NC |
767 | #define LOW_HI_ORDER 0xF800F000 |
768 | #define HI_LOW_ORDER 0xF000F800 | |
252b5132 RH |
769 | |
770 | static insn32 | |
771 | insert_thumb_branch (br_insn, rel_off) | |
772 | insn32 br_insn; | |
773 | int rel_off; | |
774 | { | |
775 | unsigned int low_bits; | |
776 | unsigned int high_bits; | |
777 | ||
252b5132 RH |
778 | BFD_ASSERT ((rel_off & 1) != 1); |
779 | ||
dfc5f959 NC |
780 | rel_off >>= 1; /* Half word aligned address. */ |
781 | low_bits = rel_off & 0x000007FF; /* The bottom 11 bits. */ | |
782 | high_bits = (rel_off >> 11) & 0x000007FF; /* The top 11 bits. */ | |
252b5132 RH |
783 | |
784 | if ((br_insn & LOW_HI_ORDER) == LOW_HI_ORDER) | |
785 | br_insn = LOW_HI_ORDER | (low_bits << 16) | high_bits; | |
786 | else if ((br_insn & HI_LOW_ORDER) == HI_LOW_ORDER) | |
787 | br_insn = HI_LOW_ORDER | (high_bits << 16) | low_bits; | |
788 | else | |
9b485d32 NC |
789 | /* FIXME: abort is probably not the right call. krk@cygnus.com */ |
790 | abort (); /* error - not a valid branch instruction form. */ | |
252b5132 | 791 | |
252b5132 RH |
792 | return br_insn; |
793 | } | |
794 | ||
9b485d32 NC |
795 | /* Thumb code calling an ARM function. */ |
796 | ||
252b5132 RH |
797 | static int |
798 | elf32_thumb_to_arm_stub (info, name, input_bfd, output_bfd, input_section, | |
799 | hit_data, sym_sec, offset, addend, val) | |
bcbdc74c NC |
800 | struct bfd_link_info * info; |
801 | const char * name; | |
802 | bfd * input_bfd; | |
803 | bfd * output_bfd; | |
804 | asection * input_section; | |
805 | bfd_byte * hit_data; | |
806 | asection * sym_sec; | |
807 | bfd_vma offset; | |
808 | bfd_signed_vma addend; | |
809 | bfd_vma val; | |
252b5132 | 810 | { |
bcbdc74c | 811 | asection * s = 0; |
252b5132 RH |
812 | long int my_offset; |
813 | unsigned long int tmp; | |
814 | long int ret_offset; | |
bcbdc74c NC |
815 | struct elf_link_hash_entry * myh; |
816 | struct elf32_arm_link_hash_table * globals; | |
252b5132 RH |
817 | |
818 | myh = find_thumb_glue (info, name, input_bfd); | |
819 | if (myh == NULL) | |
820 | return false; | |
821 | ||
822 | globals = elf32_arm_hash_table (info); | |
823 | ||
824 | BFD_ASSERT (globals != NULL); | |
825 | BFD_ASSERT (globals->bfd_of_glue_owner != NULL); | |
826 | ||
827 | my_offset = myh->root.u.def.value; | |
828 | ||
829 | s = bfd_get_section_by_name (globals->bfd_of_glue_owner, | |
830 | THUMB2ARM_GLUE_SECTION_NAME); | |
831 | ||
832 | BFD_ASSERT (s != NULL); | |
833 | BFD_ASSERT (s->contents != NULL); | |
834 | BFD_ASSERT (s->output_section != NULL); | |
835 | ||
836 | if ((my_offset & 0x01) == 0x01) | |
837 | { | |
838 | if (sym_sec != NULL | |
839 | && sym_sec->owner != NULL | |
840 | && !INTERWORK_FLAG (sym_sec->owner)) | |
841 | { | |
842 | _bfd_error_handler | |
9b485d32 | 843 | (_("%s(%s): warning: interworking not enabled."), |
252b5132 RH |
844 | bfd_get_filename (sym_sec->owner), name); |
845 | _bfd_error_handler | |
9b485d32 | 846 | (_(" first occurrence: %s: thumb call to arm"), |
252b5132 RH |
847 | bfd_get_filename (input_bfd)); |
848 | ||
849 | return false; | |
850 | } | |
851 | ||
852 | --my_offset; | |
853 | myh->root.u.def.value = my_offset; | |
854 | ||
855 | bfd_put_16 (output_bfd, t2a1_bx_pc_insn, | |
856 | s->contents + my_offset); | |
857 | ||
858 | bfd_put_16 (output_bfd, t2a2_noop_insn, | |
859 | s->contents + my_offset + 2); | |
860 | ||
861 | ret_offset = | |
9b485d32 NC |
862 | /* Address of destination of the stub. */ |
863 | ((bfd_signed_vma) val) | |
252b5132 | 864 | - ((bfd_signed_vma) |
9b485d32 NC |
865 | /* Offset from the start of the current section to the start of the stubs. */ |
866 | (s->output_offset | |
867 | /* Offset of the start of this stub from the start of the stubs. */ | |
868 | + my_offset | |
869 | /* Address of the start of the current section. */ | |
870 | + s->output_section->vma) | |
871 | /* The branch instruction is 4 bytes into the stub. */ | |
872 | + 4 | |
873 | /* ARM branches work from the pc of the instruction + 8. */ | |
874 | + 8); | |
252b5132 RH |
875 | |
876 | bfd_put_32 (output_bfd, | |
877 | t2a3_b_insn | ((ret_offset >> 2) & 0x00FFFFFF), | |
878 | s->contents + my_offset + 4); | |
879 | } | |
880 | ||
881 | BFD_ASSERT (my_offset <= globals->thumb_glue_size); | |
882 | ||
883 | /* Now go back and fix up the original BL insn to point | |
884 | to here. */ | |
885 | ret_offset = | |
886 | s->output_offset | |
887 | + my_offset | |
888 | - (input_section->output_offset | |
889 | + offset + addend) | |
756fa1b9 | 890 | - 8; |
252b5132 RH |
891 | |
892 | tmp = bfd_get_32 (input_bfd, hit_data | |
893 | - input_section->vma); | |
894 | ||
895 | bfd_put_32 (output_bfd, | |
896 | insert_thumb_branch (tmp, ret_offset), | |
897 | hit_data - input_section->vma); | |
898 | ||
899 | return true; | |
900 | } | |
901 | ||
9b485d32 NC |
902 | /* Arm code calling a Thumb function. */ |
903 | ||
252b5132 RH |
904 | static int |
905 | elf32_arm_to_thumb_stub (info, name, input_bfd, output_bfd, input_section, | |
906 | hit_data, sym_sec, offset, addend, val) | |
bcbdc74c NC |
907 | struct bfd_link_info * info; |
908 | const char * name; | |
909 | bfd * input_bfd; | |
910 | bfd * output_bfd; | |
911 | asection * input_section; | |
912 | bfd_byte * hit_data; | |
913 | asection * sym_sec; | |
914 | bfd_vma offset; | |
915 | bfd_signed_vma addend; | |
916 | bfd_vma val; | |
252b5132 RH |
917 | { |
918 | unsigned long int tmp; | |
919 | long int my_offset; | |
bcbdc74c | 920 | asection * s; |
252b5132 | 921 | long int ret_offset; |
bcbdc74c NC |
922 | struct elf_link_hash_entry * myh; |
923 | struct elf32_arm_link_hash_table * globals; | |
252b5132 RH |
924 | |
925 | myh = find_arm_glue (info, name, input_bfd); | |
926 | if (myh == NULL) | |
927 | return false; | |
928 | ||
929 | globals = elf32_arm_hash_table (info); | |
930 | ||
931 | BFD_ASSERT (globals != NULL); | |
932 | BFD_ASSERT (globals->bfd_of_glue_owner != NULL); | |
933 | ||
934 | my_offset = myh->root.u.def.value; | |
935 | s = bfd_get_section_by_name (globals->bfd_of_glue_owner, | |
936 | ARM2THUMB_GLUE_SECTION_NAME); | |
937 | BFD_ASSERT (s != NULL); | |
938 | BFD_ASSERT (s->contents != NULL); | |
939 | BFD_ASSERT (s->output_section != NULL); | |
940 | ||
941 | if ((my_offset & 0x01) == 0x01) | |
942 | { | |
943 | if (sym_sec != NULL | |
944 | && sym_sec->owner != NULL | |
945 | && !INTERWORK_FLAG (sym_sec->owner)) | |
946 | { | |
947 | _bfd_error_handler | |
9b485d32 | 948 | (_("%s(%s): warning: interworking not enabled."), |
252b5132 RH |
949 | bfd_get_filename (sym_sec->owner), name); |
950 | _bfd_error_handler | |
9b485d32 | 951 | (_(" first occurrence: %s: arm call to thumb"), |
252b5132 RH |
952 | bfd_get_filename (input_bfd)); |
953 | } | |
9b485d32 | 954 | |
252b5132 RH |
955 | --my_offset; |
956 | myh->root.u.def.value = my_offset; | |
957 | ||
958 | bfd_put_32 (output_bfd, a2t1_ldr_insn, | |
959 | s->contents + my_offset); | |
960 | ||
961 | bfd_put_32 (output_bfd, a2t2_bx_r12_insn, | |
962 | s->contents + my_offset + 4); | |
963 | ||
964 | /* It's a thumb address. Add the low order bit. */ | |
965 | bfd_put_32 (output_bfd, val | a2t3_func_addr_insn, | |
966 | s->contents + my_offset + 8); | |
967 | } | |
968 | ||
969 | BFD_ASSERT (my_offset <= globals->arm_glue_size); | |
970 | ||
971 | tmp = bfd_get_32 (input_bfd, hit_data); | |
972 | tmp = tmp & 0xFF000000; | |
973 | ||
9b485d32 | 974 | /* Somehow these are both 4 too far, so subtract 8. */ |
252b5132 RH |
975 | ret_offset = s->output_offset |
976 | + my_offset | |
977 | + s->output_section->vma | |
978 | - (input_section->output_offset | |
979 | + input_section->output_section->vma | |
980 | + offset + addend) | |
981 | - 8; | |
9a5aca8c | 982 | |
252b5132 RH |
983 | tmp = tmp | ((ret_offset >> 2) & 0x00FFFFFF); |
984 | ||
985 | bfd_put_32 (output_bfd, tmp, hit_data | |
986 | - input_section->vma); | |
987 | ||
252b5132 RH |
988 | return true; |
989 | } | |
990 | ||
991 | /* Perform a relocation as part of a final link. */ | |
9b485d32 | 992 | |
252b5132 RH |
993 | static bfd_reloc_status_type |
994 | elf32_arm_final_link_relocate (howto, input_bfd, output_bfd, | |
995 | input_section, contents, rel, value, | |
780a67af | 996 | info, sym_sec, sym_name, sym_flags, h) |
252b5132 RH |
997 | reloc_howto_type * howto; |
998 | bfd * input_bfd; | |
999 | bfd * output_bfd; | |
1000 | asection * input_section; | |
1001 | bfd_byte * contents; | |
1002 | Elf_Internal_Rela * rel; | |
1003 | bfd_vma value; | |
1004 | struct bfd_link_info * info; | |
1005 | asection * sym_sec; | |
1006 | const char * sym_name; | |
1007 | unsigned char sym_flags; | |
780a67af | 1008 | struct elf_link_hash_entry * h; |
252b5132 RH |
1009 | { |
1010 | unsigned long r_type = howto->type; | |
1011 | unsigned long r_symndx; | |
1012 | bfd_byte * hit_data = contents + rel->r_offset; | |
1013 | bfd * dynobj = NULL; | |
1014 | Elf_Internal_Shdr * symtab_hdr; | |
1015 | struct elf_link_hash_entry ** sym_hashes; | |
1016 | bfd_vma * local_got_offsets; | |
1017 | asection * sgot = NULL; | |
1018 | asection * splt = NULL; | |
1019 | asection * sreloc = NULL; | |
252b5132 | 1020 | bfd_vma addend; |
ba96a88f NC |
1021 | bfd_signed_vma signed_addend; |
1022 | struct elf32_arm_link_hash_table * globals; | |
f21f3fe0 | 1023 | |
ba96a88f | 1024 | globals = elf32_arm_hash_table (info); |
f21f3fe0 | 1025 | |
252b5132 RH |
1026 | dynobj = elf_hash_table (info)->dynobj; |
1027 | if (dynobj) | |
1028 | { | |
1029 | sgot = bfd_get_section_by_name (dynobj, ".got"); | |
1030 | splt = bfd_get_section_by_name (dynobj, ".plt"); | |
1031 | } | |
1032 | symtab_hdr = & elf_tdata (input_bfd)->symtab_hdr; | |
1033 | sym_hashes = elf_sym_hashes (input_bfd); | |
1034 | local_got_offsets = elf_local_got_offsets (input_bfd); | |
1035 | r_symndx = ELF32_R_SYM (rel->r_info); | |
1036 | ||
1037 | #ifdef USE_REL | |
ba96a88f NC |
1038 | addend = bfd_get_32 (input_bfd, hit_data) & howto->src_mask; |
1039 | ||
1040 | if (addend & ((howto->src_mask + 1) >> 1)) | |
1041 | { | |
1042 | signed_addend = -1; | |
1043 | signed_addend &= ~ howto->src_mask; | |
1044 | signed_addend |= addend; | |
1045 | } | |
1046 | else | |
1047 | signed_addend = addend; | |
252b5132 | 1048 | #else |
ba96a88f | 1049 | addend = signed_addend = rel->r_addend; |
252b5132 | 1050 | #endif |
f21f3fe0 | 1051 | |
252b5132 RH |
1052 | switch (r_type) |
1053 | { | |
1054 | case R_ARM_NONE: | |
1055 | return bfd_reloc_ok; | |
1056 | ||
1057 | case R_ARM_PC24: | |
1058 | case R_ARM_ABS32: | |
1059 | case R_ARM_REL32: | |
dfc5f959 NC |
1060 | #ifndef OLD_ARM_ABI |
1061 | case R_ARM_XPC25: | |
1062 | #endif | |
252b5132 | 1063 | /* When generating a shared object, these relocations are copied |
9b485d32 | 1064 | into the output file to be resolved at run time. */ |
252b5132 RH |
1065 | if (info->shared |
1066 | && (r_type != R_ARM_PC24 | |
1067 | || (h != NULL | |
1068 | && h->dynindx != -1 | |
1069 | && (! info->symbolic | |
1070 | || (h->elf_link_hash_flags | |
1071 | & ELF_LINK_HASH_DEF_REGULAR) == 0)))) | |
1072 | { | |
1073 | Elf_Internal_Rel outrel; | |
1074 | boolean skip, relocate; | |
f21f3fe0 | 1075 | |
252b5132 RH |
1076 | if (sreloc == NULL) |
1077 | { | |
1078 | const char * name; | |
f21f3fe0 | 1079 | |
252b5132 RH |
1080 | name = (bfd_elf_string_from_elf_section |
1081 | (input_bfd, | |
1082 | elf_elfheader (input_bfd)->e_shstrndx, | |
1083 | elf_section_data (input_section)->rel_hdr.sh_name)); | |
1084 | if (name == NULL) | |
1085 | return bfd_reloc_notsupported; | |
f21f3fe0 | 1086 | |
252b5132 RH |
1087 | BFD_ASSERT (strncmp (name, ".rel", 4) == 0 |
1088 | && strcmp (bfd_get_section_name (input_bfd, | |
1089 | input_section), | |
1090 | name + 4) == 0); | |
f21f3fe0 | 1091 | |
252b5132 RH |
1092 | sreloc = bfd_get_section_by_name (dynobj, name); |
1093 | BFD_ASSERT (sreloc != NULL); | |
1094 | } | |
f21f3fe0 | 1095 | |
252b5132 | 1096 | skip = false; |
f21f3fe0 | 1097 | |
252b5132 RH |
1098 | if (elf_section_data (input_section)->stab_info == NULL) |
1099 | outrel.r_offset = rel->r_offset; | |
1100 | else | |
1101 | { | |
1102 | bfd_vma off; | |
f21f3fe0 | 1103 | |
252b5132 RH |
1104 | off = (_bfd_stab_section_offset |
1105 | (output_bfd, &elf_hash_table (info)->stab_info, | |
1106 | input_section, | |
1107 | & elf_section_data (input_section)->stab_info, | |
1108 | rel->r_offset)); | |
1109 | if (off == (bfd_vma) -1) | |
1110 | skip = true; | |
1111 | outrel.r_offset = off; | |
1112 | } | |
f21f3fe0 | 1113 | |
252b5132 RH |
1114 | outrel.r_offset += (input_section->output_section->vma |
1115 | + input_section->output_offset); | |
f21f3fe0 | 1116 | |
252b5132 RH |
1117 | if (skip) |
1118 | { | |
1119 | memset (&outrel, 0, sizeof outrel); | |
1120 | relocate = false; | |
1121 | } | |
1122 | else if (r_type == R_ARM_PC24) | |
1123 | { | |
1124 | BFD_ASSERT (h != NULL && h->dynindx != -1); | |
1125 | if ((input_section->flags & SEC_ALLOC) != 0) | |
1126 | relocate = false; | |
1127 | else | |
1128 | relocate = true; | |
1129 | outrel.r_info = ELF32_R_INFO (h->dynindx, R_ARM_PC24); | |
1130 | } | |
1131 | else | |
1132 | { | |
1133 | if (h == NULL | |
1134 | || ((info->symbolic || h->dynindx == -1) | |
1135 | && (h->elf_link_hash_flags | |
1136 | & ELF_LINK_HASH_DEF_REGULAR) != 0)) | |
1137 | { | |
1138 | relocate = true; | |
1139 | outrel.r_info = ELF32_R_INFO (0, R_ARM_RELATIVE); | |
1140 | } | |
1141 | else | |
1142 | { | |
1143 | BFD_ASSERT (h->dynindx != -1); | |
1144 | if ((input_section->flags & SEC_ALLOC) != 0) | |
1145 | relocate = false; | |
1146 | else | |
1147 | relocate = true; | |
1148 | outrel.r_info = ELF32_R_INFO (h->dynindx, R_ARM_ABS32); | |
1149 | } | |
1150 | } | |
f21f3fe0 | 1151 | |
252b5132 RH |
1152 | bfd_elf32_swap_reloc_out (output_bfd, &outrel, |
1153 | (((Elf32_External_Rel *) | |
1154 | sreloc->contents) | |
1155 | + sreloc->reloc_count)); | |
1156 | ++sreloc->reloc_count; | |
9a5aca8c | 1157 | |
f21f3fe0 | 1158 | /* If this reloc is against an external symbol, we do not want to |
252b5132 | 1159 | fiddle with the addend. Otherwise, we need to include the symbol |
9b485d32 | 1160 | value so that it becomes an addend for the dynamic reloc. */ |
252b5132 RH |
1161 | if (! relocate) |
1162 | return bfd_reloc_ok; | |
9a5aca8c | 1163 | |
f21f3fe0 | 1164 | return _bfd_final_link_relocate (howto, input_bfd, input_section, |
252b5132 RH |
1165 | contents, rel->r_offset, value, |
1166 | (bfd_vma) 0); | |
1167 | } | |
1168 | else switch (r_type) | |
1169 | { | |
dfc5f959 NC |
1170 | #ifndef OLD_ARM_ABI |
1171 | case R_ARM_XPC25: /* Arm BLX instruction. */ | |
1172 | #endif | |
1173 | case R_ARM_PC24: /* Arm B/BL instruction */ | |
1174 | #ifndef OLD_ARM_ABI | |
1175 | if (r_type == R_ARM_XPC25) | |
252b5132 | 1176 | { |
dfc5f959 NC |
1177 | /* Check for Arm calling Arm function. */ |
1178 | /* FIXME: Should we translate the instruction into a BL | |
1179 | instruction instead ? */ | |
1180 | if (sym_flags != STT_ARM_TFUNC) | |
1181 | _bfd_error_handler (_("\ | |
1182 | %s: Warning: Arm BLX instruction targets Arm function '%s'."), | |
1183 | bfd_get_filename (input_bfd), | |
b1bcb49f | 1184 | h ? h->root.root.string : "(local)"); |
dfc5f959 NC |
1185 | } |
1186 | else | |
1187 | #endif | |
1188 | { | |
1189 | /* Check for Arm calling Thumb function. */ | |
1190 | if (sym_flags == STT_ARM_TFUNC) | |
1191 | { | |
1192 | elf32_arm_to_thumb_stub (info, sym_name, input_bfd, output_bfd, | |
1193 | input_section, hit_data, sym_sec, rel->r_offset, | |
1194 | signed_addend, value); | |
1195 | return bfd_reloc_ok; | |
1196 | } | |
252b5132 | 1197 | } |
ba96a88f NC |
1198 | |
1199 | if ( strcmp (bfd_get_target (input_bfd), "elf32-littlearm-oabi") == 0 | |
1200 | || strcmp (bfd_get_target (input_bfd), "elf32-bigarm-oabi") == 0) | |
1201 | { | |
1202 | /* The old way of doing things. Trearing the addend as a | |
1203 | byte sized field and adding in the pipeline offset. */ | |
ba96a88f NC |
1204 | value -= (input_section->output_section->vma |
1205 | + input_section->output_offset); | |
1206 | value -= rel->r_offset; | |
1207 | value += addend; | |
f21f3fe0 | 1208 | |
ba96a88f NC |
1209 | if (! globals->no_pipeline_knowledge) |
1210 | value -= 8; | |
1211 | } | |
1212 | else | |
1213 | { | |
1214 | /* The ARM ELF ABI says that this reloc is computed as: S - P + A | |
1215 | where: | |
1216 | S is the address of the symbol in the relocation. | |
1217 | P is address of the instruction being relocated. | |
1218 | A is the addend (extracted from the instruction) in bytes. | |
f21f3fe0 | 1219 | |
ba96a88f NC |
1220 | S is held in 'value'. |
1221 | P is the base address of the section containing the instruction | |
1222 | plus the offset of the reloc into that section, ie: | |
1223 | (input_section->output_section->vma + | |
1224 | input_section->output_offset + | |
1225 | rel->r_offset). | |
1226 | A is the addend, converted into bytes, ie: | |
1227 | (signed_addend * 4) | |
1228 | ||
1229 | Note: None of these operations have knowledge of the pipeline | |
1230 | size of the processor, thus it is up to the assembler to encode | |
1231 | this information into the addend. */ | |
ba96a88f NC |
1232 | value -= (input_section->output_section->vma |
1233 | + input_section->output_offset); | |
1234 | value -= rel->r_offset; | |
1235 | value += (signed_addend << howto->size); | |
f21f3fe0 | 1236 | |
ba96a88f NC |
1237 | /* Previous versions of this code also used to add in the pipeline |
1238 | offset here. This is wrong because the linker is not supposed | |
1239 | to know about such things, and one day it might change. In order | |
1240 | to support old binaries that need the old behaviour however, so | |
1241 | we attempt to detect which ABI was used to create the reloc. */ | |
1242 | if (! globals->no_pipeline_knowledge) | |
f21f3fe0 | 1243 | { |
ba96a88f | 1244 | Elf_Internal_Ehdr * i_ehdrp; /* Elf file header, internal form */ |
f21f3fe0 | 1245 | |
ba96a88f | 1246 | i_ehdrp = elf_elfheader (input_bfd); |
f21f3fe0 | 1247 | |
ba96a88f NC |
1248 | if (i_ehdrp->e_ident[EI_OSABI] == 0) |
1249 | value -= 8; | |
1250 | } | |
1251 | } | |
23080146 | 1252 | |
dcb5e6e6 NC |
1253 | signed_addend = value; |
1254 | signed_addend >>= howto->rightshift; | |
9a5aca8c | 1255 | |
59f2c4e7 NC |
1256 | /* It is not an error for an undefined weak reference to be |
1257 | out of range. Any program that branches to such a symbol | |
9a5aca8c AM |
1258 | is going to crash anyway, so there is no point worrying |
1259 | about getting the destination exactly right. */ | |
59f2c4e7 NC |
1260 | if (! h || h->root.type != bfd_link_hash_undefweak) |
1261 | { | |
9b485d32 | 1262 | /* Perform a signed range check. */ |
dcb5e6e6 | 1263 | if ( signed_addend > ((bfd_signed_vma) (howto->dst_mask >> 1)) |
59f2c4e7 NC |
1264 | || signed_addend < - ((bfd_signed_vma) ((howto->dst_mask + 1) >> 1))) |
1265 | return bfd_reloc_overflow; | |
1266 | } | |
9a5aca8c | 1267 | |
dcb5e6e6 NC |
1268 | #ifndef OLD_ARM_ABI |
1269 | /* If necessary set the H bit in the BLX instruction. */ | |
1270 | if (r_type == R_ARM_XPC25 && ((value & 2) == 2)) | |
1271 | value = (signed_addend & howto->dst_mask) | |
1272 | | (bfd_get_32 (input_bfd, hit_data) & (~ howto->dst_mask)) | |
1273 | | (1 << 24); | |
1274 | else | |
1275 | #endif | |
1276 | value = (signed_addend & howto->dst_mask) | |
1277 | | (bfd_get_32 (input_bfd, hit_data) & (~ howto->dst_mask)); | |
252b5132 | 1278 | break; |
f21f3fe0 | 1279 | |
252b5132 RH |
1280 | case R_ARM_ABS32: |
1281 | value += addend; | |
1282 | if (sym_flags == STT_ARM_TFUNC) | |
1283 | value |= 1; | |
1284 | break; | |
f21f3fe0 | 1285 | |
252b5132 RH |
1286 | case R_ARM_REL32: |
1287 | value -= (input_section->output_section->vma | |
1288 | + input_section->output_offset); | |
1289 | value += addend; | |
1290 | break; | |
1291 | } | |
f21f3fe0 | 1292 | |
252b5132 RH |
1293 | bfd_put_32 (input_bfd, value, hit_data); |
1294 | return bfd_reloc_ok; | |
1295 | ||
1296 | case R_ARM_ABS8: | |
1297 | value += addend; | |
1298 | if ((long) value > 0x7f || (long) value < -0x80) | |
1299 | return bfd_reloc_overflow; | |
1300 | ||
1301 | bfd_put_8 (input_bfd, value, hit_data); | |
1302 | return bfd_reloc_ok; | |
1303 | ||
1304 | case R_ARM_ABS16: | |
1305 | value += addend; | |
1306 | ||
1307 | if ((long) value > 0x7fff || (long) value < -0x8000) | |
1308 | return bfd_reloc_overflow; | |
1309 | ||
1310 | bfd_put_16 (input_bfd, value, hit_data); | |
1311 | return bfd_reloc_ok; | |
1312 | ||
1313 | case R_ARM_ABS12: | |
1314 | /* Support ldr and str instruction for the arm */ | |
1315 | /* Also thumb b (unconditional branch). ??? Really? */ | |
1316 | value += addend; | |
1317 | ||
1318 | if ((long) value > 0x7ff || (long) value < -0x800) | |
1319 | return bfd_reloc_overflow; | |
1320 | ||
1321 | value |= (bfd_get_32 (input_bfd, hit_data) & 0xfffff000); | |
1322 | bfd_put_32 (input_bfd, value, hit_data); | |
1323 | return bfd_reloc_ok; | |
1324 | ||
1325 | case R_ARM_THM_ABS5: | |
9b485d32 | 1326 | /* Support ldr and str instructions for the thumb. */ |
252b5132 RH |
1327 | #ifdef USE_REL |
1328 | /* Need to refetch addend. */ | |
1329 | addend = bfd_get_16 (input_bfd, hit_data) & howto->src_mask; | |
1330 | /* ??? Need to determine shift amount from operand size. */ | |
1331 | addend >>= howto->rightshift; | |
1332 | #endif | |
1333 | value += addend; | |
1334 | ||
1335 | /* ??? Isn't value unsigned? */ | |
1336 | if ((long) value > 0x1f || (long) value < -0x10) | |
1337 | return bfd_reloc_overflow; | |
1338 | ||
1339 | /* ??? Value needs to be properly shifted into place first. */ | |
1340 | value |= bfd_get_16 (input_bfd, hit_data) & 0xf83f; | |
1341 | bfd_put_16 (input_bfd, value, hit_data); | |
1342 | return bfd_reloc_ok; | |
1343 | ||
dfc5f959 NC |
1344 | #ifndef OLD_ARM_ABI |
1345 | case R_ARM_THM_XPC22: | |
1346 | #endif | |
252b5132 | 1347 | case R_ARM_THM_PC22: |
dfc5f959 | 1348 | /* Thumb BL (branch long instruction). */ |
252b5132 | 1349 | { |
ba96a88f NC |
1350 | bfd_vma relocation; |
1351 | boolean overflow = false; | |
1352 | bfd_vma upper_insn = bfd_get_16 (input_bfd, hit_data); | |
1353 | bfd_vma lower_insn = bfd_get_16 (input_bfd, hit_data + 2); | |
252b5132 | 1354 | bfd_signed_vma reloc_signed_max = (1 << (howto->bitsize - 1)) - 1; |
ba96a88f NC |
1355 | bfd_signed_vma reloc_signed_min = ~ reloc_signed_max; |
1356 | bfd_vma check; | |
252b5132 | 1357 | bfd_signed_vma signed_check; |
252b5132 RH |
1358 | |
1359 | #ifdef USE_REL | |
1360 | /* Need to refetch the addend and squish the two 11 bit pieces | |
1361 | together. */ | |
1362 | { | |
ba96a88f NC |
1363 | bfd_vma upper = upper_insn & 0x7ff; |
1364 | bfd_vma lower = lower_insn & 0x7ff; | |
9b485d32 | 1365 | upper = (upper ^ 0x400) - 0x400; /* Sign extend. */ |
252b5132 | 1366 | addend = (upper << 12) | (lower << 1); |
ba96a88f | 1367 | signed_addend = addend; |
252b5132 RH |
1368 | } |
1369 | #endif | |
dfc5f959 NC |
1370 | #ifndef OLD_ARM_ABI |
1371 | if (r_type == R_ARM_THM_XPC22) | |
1372 | { | |
1373 | /* Check for Thumb to Thumb call. */ | |
1374 | /* FIXME: Should we translate the instruction into a BL | |
1375 | instruction instead ? */ | |
1376 | if (sym_flags == STT_ARM_TFUNC) | |
1377 | _bfd_error_handler (_("\ | |
1378 | %s: Warning: Thumb BLX instruction targets thumb function '%s'."), | |
1379 | bfd_get_filename (input_bfd), | |
b1bcb49f | 1380 | h ? h->root.root.string : "(local)"); |
dfc5f959 NC |
1381 | } |
1382 | else | |
1383 | #endif | |
252b5132 | 1384 | { |
dfc5f959 NC |
1385 | /* If it is not a call to Thumb, assume call to Arm. |
1386 | If it is a call relative to a section name, then it is not a | |
1387 | function call at all, but rather a long jump. */ | |
1388 | if (sym_flags != STT_ARM_TFUNC && sym_flags != STT_SECTION) | |
1389 | { | |
1390 | if (elf32_thumb_to_arm_stub | |
1391 | (info, sym_name, input_bfd, output_bfd, input_section, | |
1392 | hit_data, sym_sec, rel->r_offset, signed_addend, value)) | |
1393 | return bfd_reloc_ok; | |
1394 | else | |
1395 | return bfd_reloc_dangerous; | |
1396 | } | |
252b5132 | 1397 | } |
f21f3fe0 | 1398 | |
ba96a88f | 1399 | relocation = value + signed_addend; |
f21f3fe0 | 1400 | |
252b5132 | 1401 | relocation -= (input_section->output_section->vma |
ba96a88f NC |
1402 | + input_section->output_offset |
1403 | + rel->r_offset); | |
9a5aca8c | 1404 | |
ba96a88f NC |
1405 | if (! globals->no_pipeline_knowledge) |
1406 | { | |
9b485d32 | 1407 | Elf_Internal_Ehdr * i_ehdrp; /* Elf file header, internal form. */ |
9a5aca8c | 1408 | |
ba96a88f | 1409 | i_ehdrp = elf_elfheader (input_bfd); |
f21f3fe0 | 1410 | |
ba96a88f NC |
1411 | /* Previous versions of this code also used to add in the pipline |
1412 | offset here. This is wrong because the linker is not supposed | |
1413 | to know about such things, and one day it might change. In order | |
1414 | to support old binaries that need the old behaviour however, so | |
1415 | we attempt to detect which ABI was used to create the reloc. */ | |
1416 | if ( strcmp (bfd_get_target (input_bfd), "elf32-littlearm-oabi") == 0 | |
1417 | || strcmp (bfd_get_target (input_bfd), "elf32-bigarm-oabi") == 0 | |
1418 | || i_ehdrp->e_ident[EI_OSABI] == 0) | |
1419 | relocation += 4; | |
1420 | } | |
f21f3fe0 | 1421 | |
252b5132 RH |
1422 | check = relocation >> howto->rightshift; |
1423 | ||
1424 | /* If this is a signed value, the rightshift just dropped | |
1425 | leading 1 bits (assuming twos complement). */ | |
1426 | if ((bfd_signed_vma) relocation >= 0) | |
1427 | signed_check = check; | |
1428 | else | |
1429 | signed_check = check | ~((bfd_vma) -1 >> howto->rightshift); | |
1430 | ||
252b5132 | 1431 | /* Assumes two's complement. */ |
ba96a88f | 1432 | if (signed_check > reloc_signed_max || signed_check < reloc_signed_min) |
252b5132 RH |
1433 | overflow = true; |
1434 | ||
1435 | /* Put RELOCATION back into the insn. */ | |
1436 | upper_insn = (upper_insn & ~(bfd_vma) 0x7ff) | ((relocation >> 12) & 0x7ff); | |
1437 | lower_insn = (lower_insn & ~(bfd_vma) 0x7ff) | ((relocation >> 1) & 0x7ff); | |
1438 | ||
1439 | /* Put the relocated value back in the object file: */ | |
1440 | bfd_put_16 (input_bfd, upper_insn, hit_data); | |
1441 | bfd_put_16 (input_bfd, lower_insn, hit_data + 2); | |
1442 | ||
1443 | return (overflow ? bfd_reloc_overflow : bfd_reloc_ok); | |
1444 | } | |
1445 | break; | |
1446 | ||
1447 | case R_ARM_GNU_VTINHERIT: | |
1448 | case R_ARM_GNU_VTENTRY: | |
1449 | return bfd_reloc_ok; | |
1450 | ||
1451 | case R_ARM_COPY: | |
1452 | return bfd_reloc_notsupported; | |
1453 | ||
1454 | case R_ARM_GLOB_DAT: | |
1455 | return bfd_reloc_notsupported; | |
1456 | ||
1457 | case R_ARM_JUMP_SLOT: | |
1458 | return bfd_reloc_notsupported; | |
1459 | ||
1460 | case R_ARM_RELATIVE: | |
1461 | return bfd_reloc_notsupported; | |
1462 | ||
1463 | case R_ARM_GOTOFF: | |
1464 | /* Relocation is relative to the start of the | |
1465 | global offset table. */ | |
1466 | ||
1467 | BFD_ASSERT (sgot != NULL); | |
1468 | if (sgot == NULL) | |
1469 | return bfd_reloc_notsupported; | |
9a5aca8c | 1470 | |
252b5132 RH |
1471 | /* Note that sgot->output_offset is not involved in this |
1472 | calculation. We always want the start of .got. If we | |
1473 | define _GLOBAL_OFFSET_TABLE in a different way, as is | |
1474 | permitted by the ABI, we might have to change this | |
9b485d32 | 1475 | calculation. */ |
252b5132 | 1476 | value -= sgot->output_section->vma; |
f21f3fe0 | 1477 | return _bfd_final_link_relocate (howto, input_bfd, input_section, |
252b5132 RH |
1478 | contents, rel->r_offset, value, |
1479 | (bfd_vma) 0); | |
1480 | ||
1481 | case R_ARM_GOTPC: | |
1482 | /* Use global offset table as symbol value. */ | |
252b5132 | 1483 | BFD_ASSERT (sgot != NULL); |
f21f3fe0 | 1484 | |
252b5132 RH |
1485 | if (sgot == NULL) |
1486 | return bfd_reloc_notsupported; | |
1487 | ||
1488 | value = sgot->output_section->vma; | |
f21f3fe0 | 1489 | return _bfd_final_link_relocate (howto, input_bfd, input_section, |
252b5132 RH |
1490 | contents, rel->r_offset, value, |
1491 | (bfd_vma) 0); | |
f21f3fe0 | 1492 | |
252b5132 RH |
1493 | case R_ARM_GOT32: |
1494 | /* Relocation is to the entry for this symbol in the | |
9b485d32 | 1495 | global offset table. */ |
252b5132 RH |
1496 | if (sgot == NULL) |
1497 | return bfd_reloc_notsupported; | |
f21f3fe0 | 1498 | |
252b5132 RH |
1499 | if (h != NULL) |
1500 | { | |
1501 | bfd_vma off; | |
f21f3fe0 | 1502 | |
252b5132 RH |
1503 | off = h->got.offset; |
1504 | BFD_ASSERT (off != (bfd_vma) -1); | |
f21f3fe0 | 1505 | |
252b5132 RH |
1506 | if (!elf_hash_table (info)->dynamic_sections_created || |
1507 | (info->shared && (info->symbolic || h->dynindx == -1) | |
1508 | && (h->elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR))) | |
1509 | { | |
1510 | /* This is actually a static link, or it is a -Bsymbolic link | |
1511 | and the symbol is defined locally. We must initialize this | |
1512 | entry in the global offset table. Since the offset must | |
1513 | always be a multiple of 4, we use the least significant bit | |
1514 | to record whether we have initialized it already. | |
f21f3fe0 | 1515 | |
252b5132 | 1516 | When doing a dynamic link, we create a .rel.got relocation |
f21f3fe0 | 1517 | entry to initialize the value. This is done in the |
9b485d32 | 1518 | finish_dynamic_symbol routine. */ |
252b5132 RH |
1519 | if ((off & 1) != 0) |
1520 | off &= ~1; | |
1521 | else | |
1522 | { | |
1523 | bfd_put_32 (output_bfd, value, sgot->contents + off); | |
1524 | h->got.offset |= 1; | |
1525 | } | |
1526 | } | |
f21f3fe0 | 1527 | |
252b5132 RH |
1528 | value = sgot->output_offset + off; |
1529 | } | |
1530 | else | |
1531 | { | |
1532 | bfd_vma off; | |
f21f3fe0 | 1533 | |
252b5132 RH |
1534 | BFD_ASSERT (local_got_offsets != NULL && |
1535 | local_got_offsets[r_symndx] != (bfd_vma) -1); | |
f21f3fe0 | 1536 | |
252b5132 | 1537 | off = local_got_offsets[r_symndx]; |
f21f3fe0 | 1538 | |
252b5132 RH |
1539 | /* The offset must always be a multiple of 4. We use the |
1540 | least significant bit to record whether we have already | |
9b485d32 | 1541 | generated the necessary reloc. */ |
252b5132 RH |
1542 | if ((off & 1) != 0) |
1543 | off &= ~1; | |
1544 | else | |
1545 | { | |
1546 | bfd_put_32 (output_bfd, value, sgot->contents + off); | |
f21f3fe0 | 1547 | |
252b5132 RH |
1548 | if (info->shared) |
1549 | { | |
1550 | asection * srelgot; | |
1551 | Elf_Internal_Rel outrel; | |
f21f3fe0 | 1552 | |
252b5132 RH |
1553 | srelgot = bfd_get_section_by_name (dynobj, ".rel.got"); |
1554 | BFD_ASSERT (srelgot != NULL); | |
f21f3fe0 | 1555 | |
252b5132 | 1556 | outrel.r_offset = (sgot->output_section->vma |
f21f3fe0 | 1557 | + sgot->output_offset |
252b5132 RH |
1558 | + off); |
1559 | outrel.r_info = ELF32_R_INFO (0, R_ARM_RELATIVE); | |
1560 | bfd_elf32_swap_reloc_out (output_bfd, &outrel, | |
1561 | (((Elf32_External_Rel *) | |
1562 | srelgot->contents) | |
1563 | + srelgot->reloc_count)); | |
1564 | ++srelgot->reloc_count; | |
1565 | } | |
f21f3fe0 | 1566 | |
252b5132 RH |
1567 | local_got_offsets[r_symndx] |= 1; |
1568 | } | |
f21f3fe0 | 1569 | |
252b5132 RH |
1570 | value = sgot->output_offset + off; |
1571 | } | |
9a5aca8c | 1572 | |
f21f3fe0 | 1573 | return _bfd_final_link_relocate (howto, input_bfd, input_section, |
252b5132 RH |
1574 | contents, rel->r_offset, value, |
1575 | (bfd_vma) 0); | |
f21f3fe0 | 1576 | |
252b5132 RH |
1577 | case R_ARM_PLT32: |
1578 | /* Relocation is to the entry for this symbol in the | |
1579 | procedure linkage table. */ | |
1580 | ||
1581 | /* Resolve a PLT32 reloc against a local symbol directly, | |
9b485d32 | 1582 | without using the procedure linkage table. */ |
252b5132 RH |
1583 | if (h == NULL) |
1584 | return _bfd_final_link_relocate (howto, input_bfd, input_section, | |
1585 | contents, rel->r_offset, value, | |
1586 | (bfd_vma) 0); | |
1587 | ||
1588 | if (h->plt.offset == (bfd_vma) -1) | |
1589 | /* We didn't make a PLT entry for this symbol. This | |
1590 | happens when statically linking PIC code, or when | |
1591 | using -Bsymbolic. */ | |
1592 | return _bfd_final_link_relocate (howto, input_bfd, input_section, | |
1593 | contents, rel->r_offset, value, | |
1594 | (bfd_vma) 0); | |
1595 | ||
1596 | BFD_ASSERT(splt != NULL); | |
1597 | if (splt == NULL) | |
1598 | return bfd_reloc_notsupported; | |
1599 | ||
1600 | value = (splt->output_section->vma | |
1601 | + splt->output_offset | |
1602 | + h->plt.offset); | |
1603 | return _bfd_final_link_relocate (howto, input_bfd, input_section, | |
1604 | contents, rel->r_offset, value, | |
1605 | (bfd_vma) 0); | |
f21f3fe0 | 1606 | |
252b5132 RH |
1607 | case R_ARM_SBREL32: |
1608 | return bfd_reloc_notsupported; | |
1609 | ||
1610 | case R_ARM_AMP_VCALL9: | |
1611 | return bfd_reloc_notsupported; | |
1612 | ||
1613 | case R_ARM_RSBREL32: | |
1614 | return bfd_reloc_notsupported; | |
1615 | ||
1616 | case R_ARM_THM_RPC22: | |
1617 | return bfd_reloc_notsupported; | |
1618 | ||
1619 | case R_ARM_RREL32: | |
1620 | return bfd_reloc_notsupported; | |
1621 | ||
1622 | case R_ARM_RABS32: | |
1623 | return bfd_reloc_notsupported; | |
1624 | ||
1625 | case R_ARM_RPC24: | |
1626 | return bfd_reloc_notsupported; | |
1627 | ||
1628 | case R_ARM_RBASE: | |
1629 | return bfd_reloc_notsupported; | |
1630 | ||
1631 | default: | |
1632 | return bfd_reloc_notsupported; | |
1633 | } | |
1634 | } | |
1635 | ||
98c1d4aa NC |
1636 | #ifdef USE_REL |
1637 | /* Add INCREMENT to the reloc (of type HOWTO) at ADDRESS. */ | |
1638 | static void | |
1639 | arm_add_to_rel (abfd, address, howto, increment) | |
1640 | bfd * abfd; | |
59f2c4e7 | 1641 | bfd_byte * address; |
98c1d4aa NC |
1642 | reloc_howto_type * howto; |
1643 | bfd_signed_vma increment; | |
1644 | { | |
98c1d4aa NC |
1645 | bfd_signed_vma addend; |
1646 | ||
9a5aca8c | 1647 | if (howto->type == R_ARM_THM_PC22) |
98c1d4aa | 1648 | { |
9a5aca8c AM |
1649 | int upper_insn, lower_insn; |
1650 | int upper, lower; | |
98c1d4aa | 1651 | |
9a5aca8c AM |
1652 | upper_insn = bfd_get_16 (abfd, address); |
1653 | lower_insn = bfd_get_16 (abfd, address + 2); | |
1654 | upper = upper_insn & 0x7ff; | |
1655 | lower = lower_insn & 0x7ff; | |
1656 | ||
1657 | addend = (upper << 12) | (lower << 1); | |
ddda4409 | 1658 | addend += increment; |
9a5aca8c | 1659 | addend >>= 1; |
98c1d4aa | 1660 | |
9a5aca8c AM |
1661 | upper_insn = (upper_insn & 0xf800) | ((addend >> 11) & 0x7ff); |
1662 | lower_insn = (lower_insn & 0xf800) | (addend & 0x7ff); | |
1663 | ||
1664 | bfd_put_16 (abfd, upper_insn, address); | |
1665 | bfd_put_16 (abfd, lower_insn, address + 2); | |
1666 | } | |
1667 | else | |
1668 | { | |
1669 | bfd_vma contents; | |
1670 | ||
1671 | contents = bfd_get_32 (abfd, address); | |
1672 | ||
1673 | /* Get the (signed) value from the instruction. */ | |
1674 | addend = contents & howto->src_mask; | |
1675 | if (addend & ((howto->src_mask + 1) >> 1)) | |
1676 | { | |
1677 | bfd_signed_vma mask; | |
1678 | ||
1679 | mask = -1; | |
1680 | mask &= ~ howto->src_mask; | |
1681 | addend |= mask; | |
1682 | } | |
1683 | ||
1684 | /* Add in the increment, (which is a byte value). */ | |
1685 | switch (howto->type) | |
1686 | { | |
1687 | default: | |
1688 | addend += increment; | |
1689 | break; | |
1690 | ||
1691 | case R_ARM_PC24: | |
1692 | addend <<= howto->size; | |
1693 | addend += increment; | |
1694 | ||
1695 | /* Should we check for overflow here ? */ | |
1696 | ||
1697 | /* Drop any undesired bits. */ | |
1698 | addend >>= howto->rightshift; | |
1699 | break; | |
1700 | } | |
1701 | ||
1702 | contents = (contents & ~ howto->dst_mask) | (addend & howto->dst_mask); | |
1703 | ||
1704 | bfd_put_32 (abfd, contents, address); | |
ddda4409 | 1705 | } |
98c1d4aa NC |
1706 | } |
1707 | #endif /* USE_REL */ | |
252b5132 RH |
1708 | |
1709 | /* Relocate an ARM ELF section. */ | |
1710 | static boolean | |
1711 | elf32_arm_relocate_section (output_bfd, info, input_bfd, input_section, | |
1712 | contents, relocs, local_syms, local_sections) | |
1713 | bfd * output_bfd; | |
1714 | struct bfd_link_info * info; | |
1715 | bfd * input_bfd; | |
1716 | asection * input_section; | |
1717 | bfd_byte * contents; | |
1718 | Elf_Internal_Rela * relocs; | |
1719 | Elf_Internal_Sym * local_syms; | |
1720 | asection ** local_sections; | |
1721 | { | |
1722 | Elf_Internal_Shdr * symtab_hdr; | |
1723 | struct elf_link_hash_entry ** sym_hashes; | |
1724 | Elf_Internal_Rela * rel; | |
1725 | Elf_Internal_Rela * relend; | |
1726 | const char * name; | |
1727 | ||
1728 | symtab_hdr = & elf_tdata (input_bfd)->symtab_hdr; | |
1729 | sym_hashes = elf_sym_hashes (input_bfd); | |
1730 | ||
1731 | rel = relocs; | |
1732 | relend = relocs + input_section->reloc_count; | |
1733 | for (; rel < relend; rel++) | |
1734 | { | |
ba96a88f NC |
1735 | int r_type; |
1736 | reloc_howto_type * howto; | |
1737 | unsigned long r_symndx; | |
1738 | Elf_Internal_Sym * sym; | |
1739 | asection * sec; | |
252b5132 | 1740 | struct elf_link_hash_entry * h; |
ba96a88f NC |
1741 | bfd_vma relocation; |
1742 | bfd_reloc_status_type r; | |
1743 | arelent bfd_reloc; | |
f21f3fe0 | 1744 | |
252b5132 | 1745 | r_symndx = ELF32_R_SYM (rel->r_info); |
ba96a88f | 1746 | r_type = ELF32_R_TYPE (rel->r_info); |
252b5132 | 1747 | |
ba96a88f NC |
1748 | if ( r_type == R_ARM_GNU_VTENTRY |
1749 | || r_type == R_ARM_GNU_VTINHERIT) | |
252b5132 RH |
1750 | continue; |
1751 | ||
ba96a88f NC |
1752 | elf32_arm_info_to_howto (input_bfd, & bfd_reloc, rel); |
1753 | howto = bfd_reloc.howto; | |
252b5132 RH |
1754 | |
1755 | if (info->relocateable) | |
1756 | { | |
1757 | /* This is a relocateable link. We don't have to change | |
1758 | anything, unless the reloc is against a section symbol, | |
1759 | in which case we have to adjust according to where the | |
1760 | section symbol winds up in the output section. */ | |
1761 | if (r_symndx < symtab_hdr->sh_info) | |
1762 | { | |
1763 | sym = local_syms + r_symndx; | |
1764 | if (ELF_ST_TYPE (sym->st_info) == STT_SECTION) | |
1765 | { | |
1766 | sec = local_sections[r_symndx]; | |
1767 | #ifdef USE_REL | |
98c1d4aa NC |
1768 | arm_add_to_rel (input_bfd, contents + rel->r_offset, |
1769 | howto, sec->output_offset + sym->st_value); | |
252b5132 RH |
1770 | #else |
1771 | rel->r_addend += (sec->output_offset + sym->st_value) | |
1772 | >> howto->rightshift; | |
1773 | #endif | |
1774 | } | |
1775 | } | |
1776 | ||
1777 | continue; | |
1778 | } | |
1779 | ||
1780 | /* This is a final link. */ | |
1781 | h = NULL; | |
1782 | sym = NULL; | |
1783 | sec = NULL; | |
9b485d32 | 1784 | |
252b5132 RH |
1785 | if (r_symndx < symtab_hdr->sh_info) |
1786 | { | |
1787 | sym = local_syms + r_symndx; | |
1788 | sec = local_sections[r_symndx]; | |
1789 | relocation = (sec->output_section->vma | |
1790 | + sec->output_offset | |
1791 | + sym->st_value); | |
1792 | } | |
1793 | else | |
1794 | { | |
1795 | h = sym_hashes[r_symndx - symtab_hdr->sh_info]; | |
9b485d32 NC |
1796 | |
1797 | while ( h->root.type == bfd_link_hash_indirect | |
252b5132 RH |
1798 | || h->root.type == bfd_link_hash_warning) |
1799 | h = (struct elf_link_hash_entry *) h->root.u.i.link; | |
9b485d32 NC |
1800 | |
1801 | if ( h->root.type == bfd_link_hash_defined | |
252b5132 RH |
1802 | || h->root.type == bfd_link_hash_defweak) |
1803 | { | |
780a67af | 1804 | int relocation_needed = 1; |
f21f3fe0 | 1805 | |
780a67af | 1806 | sec = h->root.u.def.section; |
f21f3fe0 | 1807 | |
252b5132 | 1808 | /* In these cases, we don't need the relocation value. |
f21f3fe0 | 1809 | We check specially because in some obscure cases |
9b485d32 | 1810 | sec->output_section will be NULL. */ |
252b5132 RH |
1811 | switch (r_type) |
1812 | { | |
1813 | case R_ARM_PC24: | |
1814 | case R_ARM_ABS32: | |
1815 | if (info->shared | |
1816 | && ( | |
1817 | (!info->symbolic && h->dynindx != -1) | |
97eaf9de | 1818 | || (h->elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR) == 0 |
252b5132 | 1819 | ) |
05924f36 PB |
1820 | && ((input_section->flags & SEC_ALLOC) != 0 |
1821 | /* DWARF will emit R_ARM_ABS32 relocations in its | |
1822 | sections against symbols defined externally | |
1823 | in shared libraries. We can't do anything | |
1824 | with them here. */ | |
1825 | || ((input_section->flags & SEC_DEBUGGING) != 0 | |
1826 | && (h->elf_link_hash_flags | |
1827 | & ELF_LINK_HASH_DEF_DYNAMIC) != 0)) | |
252b5132 | 1828 | ) |
780a67af | 1829 | relocation_needed = 0; |
252b5132 | 1830 | break; |
f21f3fe0 | 1831 | |
252b5132 | 1832 | case R_ARM_GOTPC: |
780a67af | 1833 | relocation_needed = 0; |
252b5132 | 1834 | break; |
f21f3fe0 | 1835 | |
252b5132 RH |
1836 | case R_ARM_GOT32: |
1837 | if (elf_hash_table(info)->dynamic_sections_created | |
1838 | && (!info->shared | |
1839 | || (!info->symbolic && h->dynindx != -1) | |
1840 | || (h->elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR) == 0 | |
1841 | ) | |
1842 | ) | |
780a67af | 1843 | relocation_needed = 0; |
252b5132 | 1844 | break; |
f21f3fe0 | 1845 | |
252b5132 RH |
1846 | case R_ARM_PLT32: |
1847 | if (h->plt.offset != (bfd_vma)-1) | |
780a67af | 1848 | relocation_needed = 0; |
252b5132 | 1849 | break; |
f21f3fe0 | 1850 | |
252b5132 RH |
1851 | default: |
1852 | if (sec->output_section == NULL) | |
1853 | { | |
1854 | (*_bfd_error_handler) | |
1855 | (_("%s: warning: unresolvable relocation against symbol `%s' from %s section"), | |
1856 | bfd_get_filename (input_bfd), h->root.root.string, | |
1857 | bfd_get_section_name (input_bfd, input_section)); | |
780a67af | 1858 | relocation_needed = 0; |
252b5132 RH |
1859 | } |
1860 | } | |
780a67af NC |
1861 | |
1862 | if (relocation_needed) | |
1863 | relocation = h->root.u.def.value | |
1864 | + sec->output_section->vma | |
1865 | + sec->output_offset; | |
1866 | else | |
1867 | relocation = 0; | |
252b5132 RH |
1868 | } |
1869 | else if (h->root.type == bfd_link_hash_undefweak) | |
1870 | relocation = 0; | |
3a27a730 L |
1871 | else if (info->shared && !info->symbolic |
1872 | && !info->no_undefined | |
1873 | && ELF_ST_VISIBILITY (h->other) == STV_DEFAULT) | |
a72747a3 | 1874 | relocation = 0; |
252b5132 RH |
1875 | else |
1876 | { | |
1877 | if (!((*info->callbacks->undefined_symbol) | |
1878 | (info, h->root.root.string, input_bfd, | |
5cc7c785 | 1879 | input_section, rel->r_offset, |
3a27a730 L |
1880 | (!info->shared || info->no_undefined |
1881 | || ELF_ST_VISIBILITY (h->other))))) | |
252b5132 RH |
1882 | return false; |
1883 | relocation = 0; | |
1884 | } | |
1885 | } | |
1886 | ||
1887 | if (h != NULL) | |
1888 | name = h->root.root.string; | |
1889 | else | |
1890 | { | |
1891 | name = (bfd_elf_string_from_elf_section | |
1892 | (input_bfd, symtab_hdr->sh_link, sym->st_name)); | |
1893 | if (name == NULL || *name == '\0') | |
1894 | name = bfd_section_name (input_bfd, sec); | |
1895 | } | |
f21f3fe0 | 1896 | |
252b5132 RH |
1897 | r = elf32_arm_final_link_relocate (howto, input_bfd, output_bfd, |
1898 | input_section, contents, rel, | |
1899 | relocation, info, sec, name, | |
1900 | (h ? ELF_ST_TYPE (h->type) : | |
780a67af | 1901 | ELF_ST_TYPE (sym->st_info)), h); |
252b5132 RH |
1902 | |
1903 | if (r != bfd_reloc_ok) | |
1904 | { | |
1905 | const char * msg = (const char *) 0; | |
1906 | ||
1907 | switch (r) | |
1908 | { | |
1909 | case bfd_reloc_overflow: | |
cf919dfd PB |
1910 | /* If the overflowing reloc was to an undefined symbol, |
1911 | we have already printed one error message and there | |
1912 | is no point complaining again. */ | |
1913 | if ((! h || | |
1914 | h->root.type != bfd_link_hash_undefined) | |
1915 | && (!((*info->callbacks->reloc_overflow) | |
1916 | (info, name, howto->name, (bfd_vma) 0, | |
1917 | input_bfd, input_section, rel->r_offset)))) | |
1918 | return false; | |
252b5132 RH |
1919 | break; |
1920 | ||
1921 | case bfd_reloc_undefined: | |
1922 | if (!((*info->callbacks->undefined_symbol) | |
1923 | (info, name, input_bfd, input_section, | |
5cc7c785 | 1924 | rel->r_offset, true))) |
252b5132 RH |
1925 | return false; |
1926 | break; | |
1927 | ||
1928 | case bfd_reloc_outofrange: | |
9b485d32 | 1929 | msg = _("internal error: out of range error"); |
252b5132 RH |
1930 | goto common_error; |
1931 | ||
1932 | case bfd_reloc_notsupported: | |
9b485d32 | 1933 | msg = _("internal error: unsupported relocation error"); |
252b5132 RH |
1934 | goto common_error; |
1935 | ||
1936 | case bfd_reloc_dangerous: | |
9b485d32 | 1937 | msg = _("internal error: dangerous error"); |
252b5132 RH |
1938 | goto common_error; |
1939 | ||
1940 | default: | |
9b485d32 | 1941 | msg = _("internal error: unknown error"); |
252b5132 RH |
1942 | /* fall through */ |
1943 | ||
1944 | common_error: | |
1945 | if (!((*info->callbacks->warning) | |
1946 | (info, msg, name, input_bfd, input_section, | |
1947 | rel->r_offset))) | |
1948 | return false; | |
1949 | break; | |
1950 | } | |
1951 | } | |
1952 | } | |
1953 | ||
1954 | return true; | |
1955 | } | |
1956 | ||
fc830a83 | 1957 | /* Function to keep ARM specific flags in the ELF header. */ |
252b5132 RH |
1958 | static boolean |
1959 | elf32_arm_set_private_flags (abfd, flags) | |
1960 | bfd *abfd; | |
1961 | flagword flags; | |
1962 | { | |
1963 | if (elf_flags_init (abfd) | |
1964 | && elf_elfheader (abfd)->e_flags != flags) | |
1965 | { | |
fc830a83 NC |
1966 | if (EF_ARM_EABI_VERSION (flags) == EF_ARM_EABI_UNKNOWN) |
1967 | { | |
1968 | if (flags & EF_INTERWORK) | |
9b485d32 | 1969 | _bfd_error_handler (_("\ |
252b5132 | 1970 | Warning: Not setting interwork flag of %s since it has already been specified as non-interworking"), |
fc830a83 NC |
1971 | bfd_get_filename (abfd)); |
1972 | else | |
9b485d32 | 1973 | _bfd_error_handler (_("\ |
252b5132 | 1974 | Warning: Clearing the interwork flag of %s due to outside request"), |
fc830a83 NC |
1975 | bfd_get_filename (abfd)); |
1976 | } | |
252b5132 RH |
1977 | } |
1978 | else | |
1979 | { | |
1980 | elf_elfheader (abfd)->e_flags = flags; | |
1981 | elf_flags_init (abfd) = true; | |
1982 | } | |
1983 | ||
1984 | return true; | |
1985 | } | |
1986 | ||
fc830a83 | 1987 | /* Copy backend specific data from one object module to another. */ |
9b485d32 | 1988 | |
252b5132 RH |
1989 | static boolean |
1990 | elf32_arm_copy_private_bfd_data (ibfd, obfd) | |
1991 | bfd *ibfd; | |
1992 | bfd *obfd; | |
1993 | { | |
1994 | flagword in_flags; | |
1995 | flagword out_flags; | |
1996 | ||
fc830a83 | 1997 | if ( bfd_get_flavour (ibfd) != bfd_target_elf_flavour |
252b5132 RH |
1998 | || bfd_get_flavour (obfd) != bfd_target_elf_flavour) |
1999 | return true; | |
2000 | ||
fc830a83 | 2001 | in_flags = elf_elfheader (ibfd)->e_flags; |
252b5132 RH |
2002 | out_flags = elf_elfheader (obfd)->e_flags; |
2003 | ||
fc830a83 NC |
2004 | if (elf_flags_init (obfd) |
2005 | && EF_ARM_EABI_VERSION (out_flags) == EF_ARM_EABI_UNKNOWN | |
2006 | && in_flags != out_flags) | |
252b5132 | 2007 | { |
252b5132 RH |
2008 | /* Cannot mix APCS26 and APCS32 code. */ |
2009 | if ((in_flags & EF_APCS_26) != (out_flags & EF_APCS_26)) | |
2010 | return false; | |
2011 | ||
2012 | /* Cannot mix float APCS and non-float APCS code. */ | |
2013 | if ((in_flags & EF_APCS_FLOAT) != (out_flags & EF_APCS_FLOAT)) | |
2014 | return false; | |
2015 | ||
2016 | /* If the src and dest have different interworking flags | |
2017 | then turn off the interworking bit. */ | |
2018 | if ((in_flags & EF_INTERWORK) != (out_flags & EF_INTERWORK)) | |
2019 | { | |
2020 | if (out_flags & EF_INTERWORK) | |
9b485d32 | 2021 | _bfd_error_handler (_("\ |
252b5132 RH |
2022 | Warning: Clearing the interwork flag in %s because non-interworking code in %s has been linked with it"), |
2023 | bfd_get_filename (obfd), bfd_get_filename (ibfd)); | |
2024 | ||
2025 | in_flags &= ~EF_INTERWORK; | |
2026 | } | |
1006ba19 PB |
2027 | |
2028 | /* Likewise for PIC, though don't warn for this case. */ | |
2029 | if ((in_flags & EF_PIC) != (out_flags & EF_PIC)) | |
2030 | in_flags &= ~EF_PIC; | |
252b5132 RH |
2031 | } |
2032 | ||
2033 | elf_elfheader (obfd)->e_flags = in_flags; | |
2034 | elf_flags_init (obfd) = true; | |
2035 | ||
2036 | return true; | |
2037 | } | |
2038 | ||
2039 | /* Merge backend specific data from an object file to the output | |
2040 | object file when linking. */ | |
9b485d32 | 2041 | |
252b5132 RH |
2042 | static boolean |
2043 | elf32_arm_merge_private_bfd_data (ibfd, obfd) | |
fc830a83 NC |
2044 | bfd * ibfd; |
2045 | bfd * obfd; | |
252b5132 RH |
2046 | { |
2047 | flagword out_flags; | |
2048 | flagword in_flags; | |
1006ba19 | 2049 | boolean flags_compatible = true; |
cf919dfd PB |
2050 | boolean null_input_bfd = true; |
2051 | asection *sec; | |
252b5132 | 2052 | |
9b485d32 | 2053 | /* Check if we have the same endianess. */ |
1fe494a5 NC |
2054 | if (_bfd_generic_verify_endian_match (ibfd, obfd) == false) |
2055 | return false; | |
2056 | ||
252b5132 RH |
2057 | if ( bfd_get_flavour (ibfd) != bfd_target_elf_flavour |
2058 | || bfd_get_flavour (obfd) != bfd_target_elf_flavour) | |
2059 | return true; | |
2060 | ||
252b5132 RH |
2061 | /* The input BFD must have had its flags initialised. */ |
2062 | /* The following seems bogus to me -- The flags are initialized in | |
2063 | the assembler but I don't think an elf_flags_init field is | |
9b485d32 | 2064 | written into the object. */ |
252b5132 RH |
2065 | /* BFD_ASSERT (elf_flags_init (ibfd)); */ |
2066 | ||
2067 | in_flags = elf_elfheader (ibfd)->e_flags; | |
2068 | out_flags = elf_elfheader (obfd)->e_flags; | |
2069 | ||
2070 | if (!elf_flags_init (obfd)) | |
2071 | { | |
fe077fa6 NC |
2072 | /* If the input is the default architecture and had the default |
2073 | flags then do not bother setting the flags for the output | |
2074 | architecture, instead allow future merges to do this. If no | |
2075 | future merges ever set these flags then they will retain their | |
2076 | uninitialised values, which surprise surprise, correspond | |
252b5132 | 2077 | to the default values. */ |
fe077fa6 NC |
2078 | if (bfd_get_arch_info (ibfd)->the_default |
2079 | && elf_elfheader (ibfd)->e_flags == 0) | |
252b5132 RH |
2080 | return true; |
2081 | ||
2082 | elf_flags_init (obfd) = true; | |
2083 | elf_elfheader (obfd)->e_flags = in_flags; | |
2084 | ||
2085 | if (bfd_get_arch (obfd) == bfd_get_arch (ibfd) | |
2086 | && bfd_get_arch_info (obfd)->the_default) | |
2087 | return bfd_set_arch_mach (obfd, bfd_get_arch (ibfd), bfd_get_mach (ibfd)); | |
2088 | ||
2089 | return true; | |
2090 | } | |
2091 | ||
1006ba19 | 2092 | /* Identical flags must be compatible. */ |
252b5132 RH |
2093 | if (in_flags == out_flags) |
2094 | return true; | |
2095 | ||
cf919dfd PB |
2096 | /* Check to see if the input BFD actually contains any sections. |
2097 | If not, its flags may not have been initialised either, but it cannot | |
2098 | actually cause any incompatibility. */ | |
2099 | for (sec = ibfd->sections; sec != NULL; sec = sec->next) | |
2100 | { | |
2101 | /* Ignore synthetic glue sections. */ | |
2102 | if (strcmp (sec->name, ".glue_7") | |
2103 | && strcmp (sec->name, ".glue_7t")) | |
2104 | { | |
2105 | null_input_bfd = false; | |
2106 | break; | |
2107 | } | |
2108 | } | |
2109 | if (null_input_bfd) | |
2110 | return true; | |
2111 | ||
252b5132 | 2112 | /* Complain about various flag mismatches. */ |
fc830a83 NC |
2113 | if (EF_ARM_EABI_VERSION (in_flags) != EF_ARM_EABI_VERSION (out_flags)) |
2114 | { | |
2115 | _bfd_error_handler (_("\ | |
2116 | Error: %s compiled for EABI version %d, whereas %s is compiled for version %d"), | |
2117 | bfd_get_filename (ibfd), | |
2118 | (in_flags & EF_ARM_EABIMASK) >> 24, | |
2119 | bfd_get_filename (obfd), | |
2120 | (out_flags & EF_ARM_EABIMASK) >> 24); | |
1006ba19 | 2121 | return false; |
fc830a83 | 2122 | } |
252b5132 | 2123 | |
1006ba19 PB |
2124 | /* Not sure what needs to be checked for EABI versions >= 1. */ |
2125 | if (EF_ARM_EABI_VERSION (in_flags) == EF_ARM_EABI_UNKNOWN) | |
2126 | { | |
2127 | if ((in_flags & EF_APCS_26) != (out_flags & EF_APCS_26)) | |
2128 | { | |
2129 | _bfd_error_handler (_("\ | |
252b5132 RH |
2130 | Error: %s compiled for APCS-%d, whereas %s is compiled for APCS-%d"), |
2131 | bfd_get_filename (ibfd), | |
2132 | in_flags & EF_APCS_26 ? 26 : 32, | |
2133 | bfd_get_filename (obfd), | |
2134 | out_flags & EF_APCS_26 ? 26 : 32); | |
1006ba19 PB |
2135 | flags_compatible = false; |
2136 | } | |
252b5132 | 2137 | |
1006ba19 PB |
2138 | if ((in_flags & EF_APCS_FLOAT) != (out_flags & EF_APCS_FLOAT)) |
2139 | { | |
2140 | _bfd_error_handler (_("\ | |
252b5132 RH |
2141 | Error: %s passes floats in %s registers, whereas %s passes them in %s registers"), |
2142 | bfd_get_filename (ibfd), | |
9b485d32 | 2143 | in_flags & EF_APCS_FLOAT ? _("float") : _("integer"), |
252b5132 | 2144 | bfd_get_filename (obfd), |
9b485d32 | 2145 | out_flags & EF_APCS_26 ? _("float") : _("integer")); |
1006ba19 PB |
2146 | flags_compatible = false; |
2147 | } | |
252b5132 | 2148 | |
ee43f35e | 2149 | #ifdef EF_SOFT_FLOAT |
1006ba19 PB |
2150 | if ((in_flags & EF_SOFT_FLOAT) != (out_flags & EF_SOFT_FLOAT)) |
2151 | { | |
2152 | _bfd_error_handler (_ ("\ | |
2153 | Error: %s uses %s floating point, whereas %s uses %s floating point"), | |
2154 | bfd_get_filename (ibfd), | |
2155 | in_flags & EF_SOFT_FLOAT ? _("soft") : _("hard"), | |
2156 | bfd_get_filename (obfd), | |
2157 | out_flags & EF_SOFT_FLOAT ? _("soft") : _("hard")); | |
2158 | flags_compatible = false; | |
2159 | } | |
ee43f35e | 2160 | #endif |
252b5132 | 2161 | |
1006ba19 PB |
2162 | /* Interworking mismatch is only a warning. */ |
2163 | if ((in_flags & EF_INTERWORK) != (out_flags & EF_INTERWORK)) | |
2164 | _bfd_error_handler (_("\ | |
252b5132 RH |
2165 | Warning: %s %s interworking, whereas %s %s"), |
2166 | bfd_get_filename (ibfd), | |
9b485d32 | 2167 | in_flags & EF_INTERWORK ? _("supports") : _("does not support"), |
252b5132 | 2168 | bfd_get_filename (obfd), |
9b485d32 | 2169 | out_flags & EF_INTERWORK ? _("does not") : _("does")); |
252b5132 RH |
2170 | } |
2171 | ||
1006ba19 | 2172 | return flags_compatible; |
252b5132 RH |
2173 | } |
2174 | ||
9b485d32 NC |
2175 | /* Display the flags field. */ |
2176 | ||
252b5132 RH |
2177 | static boolean |
2178 | elf32_arm_print_private_bfd_data (abfd, ptr) | |
2179 | bfd *abfd; | |
2180 | PTR ptr; | |
2181 | { | |
fc830a83 NC |
2182 | FILE * file = (FILE *) ptr; |
2183 | unsigned long flags; | |
252b5132 RH |
2184 | |
2185 | BFD_ASSERT (abfd != NULL && ptr != NULL); | |
2186 | ||
2187 | /* Print normal ELF private data. */ | |
2188 | _bfd_elf_print_private_bfd_data (abfd, ptr); | |
2189 | ||
fc830a83 | 2190 | flags = elf_elfheader (abfd)->e_flags; |
9b485d32 NC |
2191 | /* Ignore init flag - it may not be set, despite the flags field |
2192 | containing valid data. */ | |
252b5132 RH |
2193 | |
2194 | /* xgettext:c-format */ | |
9b485d32 | 2195 | fprintf (file, _("private flags = %lx:"), elf_elfheader (abfd)->e_flags); |
252b5132 | 2196 | |
fc830a83 NC |
2197 | switch (EF_ARM_EABI_VERSION (flags)) |
2198 | { | |
2199 | case EF_ARM_EABI_UNKNOWN: | |
2200 | /* The following flag bits are GNU extenstions and not part of the | |
2201 | official ARM ELF extended ABI. Hence they are only decoded if | |
2202 | the EABI version is not set. */ | |
2203 | if (flags & EF_INTERWORK) | |
9b485d32 | 2204 | fprintf (file, _(" [interworking enabled]")); |
9a5aca8c | 2205 | |
fc830a83 | 2206 | if (flags & EF_APCS_26) |
9b485d32 | 2207 | fprintf (file, _(" [APCS-26]")); |
fc830a83 | 2208 | else |
9b485d32 | 2209 | fprintf (file, _(" [APCS-32]")); |
9a5aca8c | 2210 | |
fc830a83 | 2211 | if (flags & EF_APCS_FLOAT) |
9b485d32 | 2212 | fprintf (file, _(" [floats passed in float registers]")); |
9a5aca8c | 2213 | |
fc830a83 | 2214 | if (flags & EF_PIC) |
9b485d32 | 2215 | fprintf (file, _(" [position independent]")); |
fc830a83 NC |
2216 | |
2217 | if (flags & EF_NEW_ABI) | |
9b485d32 | 2218 | fprintf (file, _(" [new ABI]")); |
9a5aca8c | 2219 | |
fc830a83 | 2220 | if (flags & EF_OLD_ABI) |
9b485d32 | 2221 | fprintf (file, _(" [old ABI]")); |
9a5aca8c | 2222 | |
fc830a83 | 2223 | if (flags & EF_SOFT_FLOAT) |
9b485d32 | 2224 | fprintf (file, _(" [software FP]")); |
9a5aca8c | 2225 | |
fc830a83 NC |
2226 | flags &= ~(EF_INTERWORK | EF_APCS_26 | EF_APCS_FLOAT | EF_PIC |
2227 | | EF_NEW_ABI | EF_OLD_ABI | EF_SOFT_FLOAT); | |
2228 | break; | |
9a5aca8c | 2229 | |
fc830a83 | 2230 | case EF_ARM_EABI_VER1: |
9b485d32 | 2231 | fprintf (file, _(" [Version1 EABI]")); |
9a5aca8c | 2232 | |
fc830a83 | 2233 | if (flags & EF_ARM_SYMSARESORTED) |
9b485d32 | 2234 | fprintf (file, _(" [sorted symbol table]")); |
fc830a83 | 2235 | else |
9b485d32 | 2236 | fprintf (file, _(" [unsorted symbol table]")); |
9a5aca8c | 2237 | |
fc830a83 NC |
2238 | flags &= ~ EF_ARM_SYMSARESORTED; |
2239 | break; | |
9a5aca8c | 2240 | |
fc830a83 | 2241 | default: |
9b485d32 | 2242 | fprintf (file, _(" <EABI version unrecognised>")); |
fc830a83 NC |
2243 | break; |
2244 | } | |
252b5132 | 2245 | |
fc830a83 | 2246 | flags &= ~ EF_ARM_EABIMASK; |
252b5132 | 2247 | |
fc830a83 | 2248 | if (flags & EF_ARM_RELEXEC) |
9b485d32 | 2249 | fprintf (file, _(" [relocatable executable]")); |
252b5132 | 2250 | |
fc830a83 | 2251 | if (flags & EF_ARM_HASENTRY) |
9b485d32 | 2252 | fprintf (file, _(" [has entry point]")); |
252b5132 | 2253 | |
fc830a83 NC |
2254 | flags &= ~ (EF_ARM_RELEXEC | EF_ARM_HASENTRY); |
2255 | ||
2256 | if (flags) | |
9b485d32 | 2257 | fprintf (file, _("<Unrecognised flag bits set>")); |
9a5aca8c | 2258 | |
252b5132 RH |
2259 | fputc ('\n', file); |
2260 | ||
2261 | return true; | |
2262 | } | |
2263 | ||
2264 | static int | |
2265 | elf32_arm_get_symbol_type (elf_sym, type) | |
2266 | Elf_Internal_Sym * elf_sym; | |
2267 | int type; | |
2268 | { | |
2f0ca46a NC |
2269 | switch (ELF_ST_TYPE (elf_sym->st_info)) |
2270 | { | |
2271 | case STT_ARM_TFUNC: | |
2272 | return ELF_ST_TYPE (elf_sym->st_info); | |
ce855c42 | 2273 | |
2f0ca46a NC |
2274 | case STT_ARM_16BIT: |
2275 | /* If the symbol is not an object, return the STT_ARM_16BIT flag. | |
2276 | This allows us to distinguish between data used by Thumb instructions | |
2277 | and non-data (which is probably code) inside Thumb regions of an | |
2278 | executable. */ | |
2279 | if (type != STT_OBJECT) | |
2280 | return ELF_ST_TYPE (elf_sym->st_info); | |
2281 | break; | |
9a5aca8c | 2282 | |
ce855c42 NC |
2283 | default: |
2284 | break; | |
2f0ca46a NC |
2285 | } |
2286 | ||
2287 | return type; | |
252b5132 | 2288 | } |
f21f3fe0 | 2289 | |
252b5132 RH |
2290 | static asection * |
2291 | elf32_arm_gc_mark_hook (abfd, info, rel, h, sym) | |
2292 | bfd *abfd; | |
5f771d47 | 2293 | struct bfd_link_info *info ATTRIBUTE_UNUSED; |
252b5132 RH |
2294 | Elf_Internal_Rela *rel; |
2295 | struct elf_link_hash_entry *h; | |
2296 | Elf_Internal_Sym *sym; | |
2297 | { | |
2298 | if (h != NULL) | |
2299 | { | |
2300 | switch (ELF32_R_TYPE (rel->r_info)) | |
2301 | { | |
2302 | case R_ARM_GNU_VTINHERIT: | |
2303 | case R_ARM_GNU_VTENTRY: | |
2304 | break; | |
2305 | ||
2306 | default: | |
2307 | switch (h->root.type) | |
2308 | { | |
2309 | case bfd_link_hash_defined: | |
2310 | case bfd_link_hash_defweak: | |
2311 | return h->root.u.def.section; | |
2312 | ||
2313 | case bfd_link_hash_common: | |
2314 | return h->root.u.c.p->section; | |
e049a0de ILT |
2315 | |
2316 | default: | |
2317 | break; | |
252b5132 RH |
2318 | } |
2319 | } | |
2320 | } | |
2321 | else | |
2322 | { | |
2323 | if (!(elf_bad_symtab (abfd) | |
2324 | && ELF_ST_BIND (sym->st_info) != STB_LOCAL) | |
2325 | && ! ((sym->st_shndx <= 0 || sym->st_shndx >= SHN_LORESERVE) | |
2326 | && sym->st_shndx != SHN_COMMON)) | |
2327 | { | |
2328 | return bfd_section_from_elf_index (abfd, sym->st_shndx); | |
2329 | } | |
2330 | } | |
2331 | return NULL; | |
2332 | } | |
2333 | ||
780a67af NC |
2334 | /* Update the got entry reference counts for the section being removed. */ |
2335 | ||
252b5132 RH |
2336 | static boolean |
2337 | elf32_arm_gc_sweep_hook (abfd, info, sec, relocs) | |
5f771d47 ILT |
2338 | bfd *abfd ATTRIBUTE_UNUSED; |
2339 | struct bfd_link_info *info ATTRIBUTE_UNUSED; | |
2340 | asection *sec ATTRIBUTE_UNUSED; | |
2341 | const Elf_Internal_Rela *relocs ATTRIBUTE_UNUSED; | |
252b5132 | 2342 | { |
780a67af | 2343 | /* We don't support garbage collection of GOT and PLT relocs yet. */ |
252b5132 RH |
2344 | return true; |
2345 | } | |
2346 | ||
780a67af NC |
2347 | /* Look through the relocs for a section during the first phase. */ |
2348 | ||
252b5132 RH |
2349 | static boolean |
2350 | elf32_arm_check_relocs (abfd, info, sec, relocs) | |
2351 | bfd * abfd; | |
2352 | struct bfd_link_info * info; | |
2353 | asection * sec; | |
2354 | const Elf_Internal_Rela * relocs; | |
2355 | { | |
2356 | Elf_Internal_Shdr * symtab_hdr; | |
2357 | struct elf_link_hash_entry ** sym_hashes; | |
2358 | struct elf_link_hash_entry ** sym_hashes_end; | |
2359 | const Elf_Internal_Rela * rel; | |
2360 | const Elf_Internal_Rela * rel_end; | |
2361 | bfd * dynobj; | |
2362 | asection * sgot, *srelgot, *sreloc; | |
2363 | bfd_vma * local_got_offsets; | |
9a5aca8c | 2364 | |
252b5132 RH |
2365 | if (info->relocateable) |
2366 | return true; | |
9a5aca8c | 2367 | |
252b5132 | 2368 | sgot = srelgot = sreloc = NULL; |
9a5aca8c | 2369 | |
252b5132 RH |
2370 | dynobj = elf_hash_table (info)->dynobj; |
2371 | local_got_offsets = elf_local_got_offsets (abfd); | |
f21f3fe0 | 2372 | |
252b5132 RH |
2373 | symtab_hdr = &elf_tdata (abfd)->symtab_hdr; |
2374 | sym_hashes = elf_sym_hashes (abfd); | |
9b485d32 NC |
2375 | sym_hashes_end = sym_hashes |
2376 | + symtab_hdr->sh_size / sizeof (Elf32_External_Sym); | |
2377 | ||
252b5132 RH |
2378 | if (!elf_bad_symtab (abfd)) |
2379 | sym_hashes_end -= symtab_hdr->sh_info; | |
9b485d32 | 2380 | |
252b5132 RH |
2381 | rel_end = relocs + sec->reloc_count; |
2382 | for (rel = relocs; rel < rel_end; rel++) | |
2383 | { | |
2384 | struct elf_link_hash_entry *h; | |
2385 | unsigned long r_symndx; | |
9a5aca8c | 2386 | |
252b5132 RH |
2387 | r_symndx = ELF32_R_SYM (rel->r_info); |
2388 | if (r_symndx < symtab_hdr->sh_info) | |
2389 | h = NULL; | |
2390 | else | |
2391 | h = sym_hashes[r_symndx - symtab_hdr->sh_info]; | |
9a5aca8c | 2392 | |
252b5132 RH |
2393 | /* Some relocs require a global offset table. */ |
2394 | if (dynobj == NULL) | |
2395 | { | |
2396 | switch (ELF32_R_TYPE (rel->r_info)) | |
2397 | { | |
2398 | case R_ARM_GOT32: | |
2399 | case R_ARM_GOTOFF: | |
2400 | case R_ARM_GOTPC: | |
2401 | elf_hash_table (info)->dynobj = dynobj = abfd; | |
2402 | if (! _bfd_elf_create_got_section (dynobj, info)) | |
2403 | return false; | |
2404 | break; | |
2405 | ||
2406 | default: | |
2407 | break; | |
2408 | } | |
2409 | } | |
2410 | ||
2411 | switch (ELF32_R_TYPE (rel->r_info)) | |
2412 | { | |
2413 | case R_ARM_GOT32: | |
2414 | /* This symbol requires a global offset table entry. */ | |
2415 | if (sgot == NULL) | |
2416 | { | |
2417 | sgot = bfd_get_section_by_name (dynobj, ".got"); | |
2418 | BFD_ASSERT (sgot != NULL); | |
2419 | } | |
2420 | ||
2421 | /* Get the got relocation section if necessary. */ | |
2422 | if (srelgot == NULL | |
2423 | && (h != NULL || info->shared)) | |
2424 | { | |
2425 | srelgot = bfd_get_section_by_name (dynobj, ".rel.got"); | |
9a5aca8c | 2426 | |
252b5132 RH |
2427 | /* If no got relocation section, make one and initialize. */ |
2428 | if (srelgot == NULL) | |
2429 | { | |
2430 | srelgot = bfd_make_section (dynobj, ".rel.got"); | |
2431 | if (srelgot == NULL | |
2432 | || ! bfd_set_section_flags (dynobj, srelgot, | |
2433 | (SEC_ALLOC | |
2434 | | SEC_LOAD | |
2435 | | SEC_HAS_CONTENTS | |
2436 | | SEC_IN_MEMORY | |
2437 | | SEC_LINKER_CREATED | |
2438 | | SEC_READONLY)) | |
2439 | || ! bfd_set_section_alignment (dynobj, srelgot, 2)) | |
2440 | return false; | |
2441 | } | |
2442 | } | |
2443 | ||
2444 | if (h != NULL) | |
2445 | { | |
2446 | if (h->got.offset != (bfd_vma) -1) | |
2447 | /* We have already allocated space in the .got. */ | |
2448 | break; | |
f21f3fe0 | 2449 | |
252b5132 RH |
2450 | h->got.offset = sgot->_raw_size; |
2451 | ||
2452 | /* Make sure this symbol is output as a dynamic symbol. */ | |
2453 | if (h->dynindx == -1) | |
2454 | if (! bfd_elf32_link_record_dynamic_symbol (info, h)) | |
2455 | return false; | |
2456 | ||
2457 | srelgot->_raw_size += sizeof (Elf32_External_Rel); | |
2458 | } | |
2459 | else | |
2460 | { | |
2461 | /* This is a global offset table entry for a local | |
2462 | symbol. */ | |
2463 | if (local_got_offsets == NULL) | |
2464 | { | |
2465 | size_t size; | |
2466 | register unsigned int i; | |
2467 | ||
2468 | size = symtab_hdr->sh_info * sizeof (bfd_vma); | |
2469 | local_got_offsets = (bfd_vma *) bfd_alloc (abfd, size); | |
2470 | if (local_got_offsets == NULL) | |
2471 | return false; | |
2472 | elf_local_got_offsets (abfd) = local_got_offsets; | |
2473 | for (i = 0; i < symtab_hdr->sh_info; i++) | |
2474 | local_got_offsets[i] = (bfd_vma) -1; | |
2475 | } | |
f21f3fe0 | 2476 | |
252b5132 RH |
2477 | if (local_got_offsets[r_symndx] != (bfd_vma) -1) |
2478 | /* We have already allocated space in the .got. */ | |
2479 | break; | |
2480 | ||
2481 | local_got_offsets[r_symndx] = sgot->_raw_size; | |
2482 | ||
2483 | if (info->shared) | |
2484 | /* If we are generating a shared object, we need to | |
2485 | output a R_ARM_RELATIVE reloc so that the dynamic | |
2486 | linker can adjust this GOT entry. */ | |
2487 | srelgot->_raw_size += sizeof (Elf32_External_Rel); | |
2488 | } | |
2489 | ||
2490 | sgot->_raw_size += 4; | |
2491 | break; | |
2492 | ||
2493 | case R_ARM_PLT32: | |
2494 | /* This symbol requires a procedure linkage table entry. We | |
2495 | actually build the entry in adjust_dynamic_symbol, | |
2496 | because this might be a case of linking PIC code which is | |
2497 | never referenced by a dynamic object, in which case we | |
2498 | don't need to generate a procedure linkage table entry | |
2499 | after all. */ | |
2500 | ||
2501 | /* If this is a local symbol, we resolve it directly without | |
2502 | creating a procedure linkage table entry. */ | |
2503 | if (h == NULL) | |
2504 | continue; | |
2505 | ||
2506 | h->elf_link_hash_flags |= ELF_LINK_HASH_NEEDS_PLT; | |
2507 | break; | |
2508 | ||
2509 | case R_ARM_ABS32: | |
2510 | case R_ARM_REL32: | |
2511 | case R_ARM_PC24: | |
2512 | /* If we are creating a shared library, and this is a reloc | |
2513 | against a global symbol, or a non PC relative reloc | |
2514 | against a local symbol, then we need to copy the reloc | |
2515 | into the shared library. However, if we are linking with | |
2516 | -Bsymbolic, we do not need to copy a reloc against a | |
2517 | global symbol which is defined in an object we are | |
2518 | including in the link (i.e., DEF_REGULAR is set). At | |
2519 | this point we have not seen all the input files, so it is | |
2520 | possible that DEF_REGULAR is not set now but will be set | |
2521 | later (it is never cleared). We account for that | |
2522 | possibility below by storing information in the | |
2523 | pcrel_relocs_copied field of the hash table entry. */ | |
2524 | if (info->shared | |
2525 | && (ELF32_R_TYPE (rel->r_info) != R_ARM_PC24 | |
2526 | || (h != NULL | |
2527 | && (! info->symbolic | |
2528 | || (h->elf_link_hash_flags | |
2529 | & ELF_LINK_HASH_DEF_REGULAR) == 0)))) | |
2530 | { | |
2531 | /* When creating a shared object, we must copy these | |
2532 | reloc types into the output file. We create a reloc | |
2533 | section in dynobj and make room for this reloc. */ | |
2534 | if (sreloc == NULL) | |
2535 | { | |
2536 | const char * name; | |
2537 | ||
2538 | name = (bfd_elf_string_from_elf_section | |
2539 | (abfd, | |
2540 | elf_elfheader (abfd)->e_shstrndx, | |
2541 | elf_section_data (sec)->rel_hdr.sh_name)); | |
2542 | if (name == NULL) | |
2543 | return false; | |
2544 | ||
2545 | BFD_ASSERT (strncmp (name, ".rel", 4) == 0 | |
2546 | && strcmp (bfd_get_section_name (abfd, sec), | |
2547 | name + 4) == 0); | |
2548 | ||
2549 | sreloc = bfd_get_section_by_name (dynobj, name); | |
2550 | if (sreloc == NULL) | |
2551 | { | |
2552 | flagword flags; | |
2553 | ||
2554 | sreloc = bfd_make_section (dynobj, name); | |
2555 | flags = (SEC_HAS_CONTENTS | SEC_READONLY | |
2556 | | SEC_IN_MEMORY | SEC_LINKER_CREATED); | |
2557 | if ((sec->flags & SEC_ALLOC) != 0) | |
2558 | flags |= SEC_ALLOC | SEC_LOAD; | |
2559 | if (sreloc == NULL | |
2560 | || ! bfd_set_section_flags (dynobj, sreloc, flags) | |
2561 | || ! bfd_set_section_alignment (dynobj, sreloc, 2)) | |
2562 | return false; | |
2563 | } | |
2564 | } | |
2565 | ||
2566 | sreloc->_raw_size += sizeof (Elf32_External_Rel); | |
2567 | /* If we are linking with -Bsymbolic, and this is a | |
2568 | global symbol, we count the number of PC relative | |
2569 | relocations we have entered for this symbol, so that | |
2570 | we can discard them again if the symbol is later | |
2571 | defined by a regular object. Note that this function | |
2572 | is only called if we are using an elf_i386 linker | |
2573 | hash table, which means that h is really a pointer to | |
2574 | an elf_i386_link_hash_entry. */ | |
2575 | if (h != NULL && info->symbolic | |
2576 | && ELF32_R_TYPE (rel->r_info) == R_ARM_PC24) | |
2577 | { | |
2578 | struct elf32_arm_link_hash_entry * eh; | |
2579 | struct elf32_arm_pcrel_relocs_copied * p; | |
2580 | ||
2581 | eh = (struct elf32_arm_link_hash_entry *) h; | |
2582 | ||
2583 | for (p = eh->pcrel_relocs_copied; p != NULL; p = p->next) | |
2584 | if (p->section == sreloc) | |
2585 | break; | |
2586 | ||
2587 | if (p == NULL) | |
2588 | { | |
2589 | p = ((struct elf32_arm_pcrel_relocs_copied *) | |
2590 | bfd_alloc (dynobj, sizeof * p)); | |
f21f3fe0 | 2591 | |
252b5132 RH |
2592 | if (p == NULL) |
2593 | return false; | |
2594 | p->next = eh->pcrel_relocs_copied; | |
2595 | eh->pcrel_relocs_copied = p; | |
2596 | p->section = sreloc; | |
2597 | p->count = 0; | |
2598 | } | |
2599 | ||
2600 | ++p->count; | |
2601 | } | |
2602 | } | |
2603 | break; | |
2604 | ||
2605 | /* This relocation describes the C++ object vtable hierarchy. | |
2606 | Reconstruct it for later use during GC. */ | |
2607 | case R_ARM_GNU_VTINHERIT: | |
2608 | if (!_bfd_elf32_gc_record_vtinherit (abfd, sec, h, rel->r_offset)) | |
2609 | return false; | |
2610 | break; | |
9a5aca8c | 2611 | |
252b5132 RH |
2612 | /* This relocation describes which C++ vtable entries are actually |
2613 | used. Record for later use during GC. */ | |
2614 | case R_ARM_GNU_VTENTRY: | |
d512aa07 | 2615 | if (!_bfd_elf32_gc_record_vtentry (abfd, sec, h, rel->r_offset)) |
252b5132 RH |
2616 | return false; |
2617 | break; | |
2618 | } | |
2619 | } | |
f21f3fe0 | 2620 | |
252b5132 RH |
2621 | return true; |
2622 | } | |
2623 | ||
f21f3fe0 | 2624 | |
252b5132 RH |
2625 | /* Find the nearest line to a particular section and offset, for error |
2626 | reporting. This code is a duplicate of the code in elf.c, except | |
9b485d32 | 2627 | that it also accepts STT_ARM_TFUNC as a symbol that names a function. */ |
252b5132 RH |
2628 | |
2629 | static boolean | |
2630 | elf32_arm_find_nearest_line | |
2631 | (abfd, section, symbols, offset, filename_ptr, functionname_ptr, line_ptr) | |
2632 | bfd * abfd; | |
2633 | asection * section; | |
2634 | asymbol ** symbols; | |
2635 | bfd_vma offset; | |
2636 | CONST char ** filename_ptr; | |
2637 | CONST char ** functionname_ptr; | |
2638 | unsigned int * line_ptr; | |
2639 | { | |
2640 | boolean found; | |
2641 | const char * filename; | |
2642 | asymbol * func; | |
2643 | bfd_vma low_func; | |
2644 | asymbol ** p; | |
2645 | ||
2646 | if (_bfd_dwarf2_find_nearest_line (abfd, section, symbols, offset, | |
f21f3fe0 | 2647 | filename_ptr, functionname_ptr, |
5e38c3b8 | 2648 | line_ptr, 0)) |
252b5132 RH |
2649 | return true; |
2650 | ||
2651 | if (! _bfd_stab_section_find_nearest_line (abfd, symbols, section, offset, | |
2652 | &found, filename_ptr, | |
2653 | functionname_ptr, line_ptr, | |
2654 | &elf_tdata (abfd)->line_info)) | |
2655 | return false; | |
f21f3fe0 | 2656 | |
252b5132 RH |
2657 | if (found) |
2658 | return true; | |
2659 | ||
2660 | if (symbols == NULL) | |
2661 | return false; | |
2662 | ||
2663 | filename = NULL; | |
2664 | func = NULL; | |
2665 | low_func = 0; | |
2666 | ||
2667 | for (p = symbols; *p != NULL; p++) | |
2668 | { | |
2669 | elf_symbol_type *q; | |
2670 | ||
2671 | q = (elf_symbol_type *) *p; | |
2672 | ||
2673 | if (bfd_get_section (&q->symbol) != section) | |
2674 | continue; | |
2675 | ||
2676 | switch (ELF_ST_TYPE (q->internal_elf_sym.st_info)) | |
2677 | { | |
2678 | default: | |
2679 | break; | |
2680 | case STT_FILE: | |
2681 | filename = bfd_asymbol_name (&q->symbol); | |
2682 | break; | |
2683 | case STT_NOTYPE: | |
2684 | case STT_FUNC: | |
2685 | case STT_ARM_TFUNC: | |
2686 | if (q->symbol.section == section | |
2687 | && q->symbol.value >= low_func | |
2688 | && q->symbol.value <= offset) | |
2689 | { | |
2690 | func = (asymbol *) q; | |
2691 | low_func = q->symbol.value; | |
2692 | } | |
2693 | break; | |
2694 | } | |
2695 | } | |
2696 | ||
2697 | if (func == NULL) | |
2698 | return false; | |
2699 | ||
2700 | *filename_ptr = filename; | |
2701 | *functionname_ptr = bfd_asymbol_name (func); | |
2702 | *line_ptr = 0; | |
f21f3fe0 | 2703 | |
252b5132 RH |
2704 | return true; |
2705 | } | |
2706 | ||
2707 | /* Adjust a symbol defined by a dynamic object and referenced by a | |
2708 | regular object. The current definition is in some section of the | |
2709 | dynamic object, but we're not including those sections. We have to | |
2710 | change the definition to something the rest of the link can | |
2711 | understand. */ | |
2712 | ||
2713 | static boolean | |
2714 | elf32_arm_adjust_dynamic_symbol (info, h) | |
2715 | struct bfd_link_info * info; | |
2716 | struct elf_link_hash_entry * h; | |
2717 | { | |
2718 | bfd * dynobj; | |
2719 | asection * s; | |
2720 | unsigned int power_of_two; | |
2721 | ||
2722 | dynobj = elf_hash_table (info)->dynobj; | |
2723 | ||
2724 | /* Make sure we know what is going on here. */ | |
2725 | BFD_ASSERT (dynobj != NULL | |
2726 | && ((h->elf_link_hash_flags & ELF_LINK_HASH_NEEDS_PLT) | |
2727 | || h->weakdef != NULL | |
2728 | || ((h->elf_link_hash_flags | |
2729 | & ELF_LINK_HASH_DEF_DYNAMIC) != 0 | |
2730 | && (h->elf_link_hash_flags | |
2731 | & ELF_LINK_HASH_REF_REGULAR) != 0 | |
2732 | && (h->elf_link_hash_flags | |
2733 | & ELF_LINK_HASH_DEF_REGULAR) == 0))); | |
2734 | ||
2735 | /* If this is a function, put it in the procedure linkage table. We | |
2736 | will fill in the contents of the procedure linkage table later, | |
2737 | when we know the address of the .got section. */ | |
2738 | if (h->type == STT_FUNC | |
2739 | || (h->elf_link_hash_flags & ELF_LINK_HASH_NEEDS_PLT) != 0) | |
2740 | { | |
2741 | if (! info->shared | |
2742 | && (h->elf_link_hash_flags & ELF_LINK_HASH_DEF_DYNAMIC) == 0 | |
2743 | && (h->elf_link_hash_flags & ELF_LINK_HASH_REF_DYNAMIC) == 0) | |
2744 | { | |
2745 | /* This case can occur if we saw a PLT32 reloc in an input | |
2746 | file, but the symbol was never referred to by a dynamic | |
2747 | object. In such a case, we don't actually need to build | |
2748 | a procedure linkage table, and we can just do a PC32 | |
2749 | reloc instead. */ | |
2750 | BFD_ASSERT ((h->elf_link_hash_flags & ELF_LINK_HASH_NEEDS_PLT) != 0); | |
2751 | return true; | |
2752 | } | |
2753 | ||
2754 | /* Make sure this symbol is output as a dynamic symbol. */ | |
2755 | if (h->dynindx == -1) | |
2756 | { | |
2757 | if (! bfd_elf32_link_record_dynamic_symbol (info, h)) | |
2758 | return false; | |
2759 | } | |
2760 | ||
2761 | s = bfd_get_section_by_name (dynobj, ".plt"); | |
2762 | BFD_ASSERT (s != NULL); | |
2763 | ||
2764 | /* If this is the first .plt entry, make room for the special | |
2765 | first entry. */ | |
2766 | if (s->_raw_size == 0) | |
2767 | s->_raw_size += PLT_ENTRY_SIZE; | |
2768 | ||
2769 | /* If this symbol is not defined in a regular file, and we are | |
2770 | not generating a shared library, then set the symbol to this | |
2771 | location in the .plt. This is required to make function | |
2772 | pointers compare as equal between the normal executable and | |
2773 | the shared library. */ | |
2774 | if (! info->shared | |
2775 | && (h->elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR) == 0) | |
2776 | { | |
2777 | h->root.u.def.section = s; | |
2778 | h->root.u.def.value = s->_raw_size; | |
2779 | } | |
2780 | ||
2781 | h->plt.offset = s->_raw_size; | |
2782 | ||
2783 | /* Make room for this entry. */ | |
2784 | s->_raw_size += PLT_ENTRY_SIZE; | |
2785 | ||
2786 | /* We also need to make an entry in the .got.plt section, which | |
2787 | will be placed in the .got section by the linker script. */ | |
252b5132 RH |
2788 | s = bfd_get_section_by_name (dynobj, ".got.plt"); |
2789 | BFD_ASSERT (s != NULL); | |
2790 | s->_raw_size += 4; | |
2791 | ||
2792 | /* We also need to make an entry in the .rel.plt section. */ | |
2793 | ||
2794 | s = bfd_get_section_by_name (dynobj, ".rel.plt"); | |
2795 | BFD_ASSERT (s != NULL); | |
2796 | s->_raw_size += sizeof (Elf32_External_Rel); | |
2797 | ||
2798 | return true; | |
2799 | } | |
2800 | ||
2801 | /* If this is a weak symbol, and there is a real definition, the | |
2802 | processor independent code will have arranged for us to see the | |
2803 | real definition first, and we can just use the same value. */ | |
2804 | if (h->weakdef != NULL) | |
2805 | { | |
2806 | BFD_ASSERT (h->weakdef->root.type == bfd_link_hash_defined | |
2807 | || h->weakdef->root.type == bfd_link_hash_defweak); | |
2808 | h->root.u.def.section = h->weakdef->root.u.def.section; | |
2809 | h->root.u.def.value = h->weakdef->root.u.def.value; | |
2810 | return true; | |
2811 | } | |
2812 | ||
2813 | /* This is a reference to a symbol defined by a dynamic object which | |
2814 | is not a function. */ | |
2815 | ||
2816 | /* If we are creating a shared library, we must presume that the | |
2817 | only references to the symbol are via the global offset table. | |
2818 | For such cases we need not do anything here; the relocations will | |
2819 | be handled correctly by relocate_section. */ | |
2820 | if (info->shared) | |
2821 | return true; | |
2822 | ||
2823 | /* We must allocate the symbol in our .dynbss section, which will | |
2824 | become part of the .bss section of the executable. There will be | |
2825 | an entry for this symbol in the .dynsym section. The dynamic | |
2826 | object will contain position independent code, so all references | |
2827 | from the dynamic object to this symbol will go through the global | |
2828 | offset table. The dynamic linker will use the .dynsym entry to | |
2829 | determine the address it must put in the global offset table, so | |
2830 | both the dynamic object and the regular object will refer to the | |
2831 | same memory location for the variable. */ | |
252b5132 RH |
2832 | s = bfd_get_section_by_name (dynobj, ".dynbss"); |
2833 | BFD_ASSERT (s != NULL); | |
2834 | ||
2835 | /* We must generate a R_ARM_COPY reloc to tell the dynamic linker to | |
2836 | copy the initial value out of the dynamic object and into the | |
2837 | runtime process image. We need to remember the offset into the | |
2838 | .rel.bss section we are going to use. */ | |
2839 | if ((h->root.u.def.section->flags & SEC_ALLOC) != 0) | |
2840 | { | |
2841 | asection *srel; | |
2842 | ||
2843 | srel = bfd_get_section_by_name (dynobj, ".rel.bss"); | |
2844 | BFD_ASSERT (srel != NULL); | |
2845 | srel->_raw_size += sizeof (Elf32_External_Rel); | |
2846 | h->elf_link_hash_flags |= ELF_LINK_HASH_NEEDS_COPY; | |
2847 | } | |
2848 | ||
2849 | /* We need to figure out the alignment required for this symbol. I | |
2850 | have no idea how ELF linkers handle this. */ | |
2851 | power_of_two = bfd_log2 (h->size); | |
2852 | if (power_of_two > 3) | |
2853 | power_of_two = 3; | |
2854 | ||
2855 | /* Apply the required alignment. */ | |
2856 | s->_raw_size = BFD_ALIGN (s->_raw_size, | |
2857 | (bfd_size_type) (1 << power_of_two)); | |
2858 | if (power_of_two > bfd_get_section_alignment (dynobj, s)) | |
2859 | { | |
2860 | if (! bfd_set_section_alignment (dynobj, s, power_of_two)) | |
2861 | return false; | |
2862 | } | |
2863 | ||
2864 | /* Define the symbol as being at this point in the section. */ | |
2865 | h->root.u.def.section = s; | |
2866 | h->root.u.def.value = s->_raw_size; | |
2867 | ||
2868 | /* Increment the section size to make room for the symbol. */ | |
2869 | s->_raw_size += h->size; | |
2870 | ||
2871 | return true; | |
2872 | } | |
2873 | ||
2874 | /* Set the sizes of the dynamic sections. */ | |
2875 | ||
2876 | static boolean | |
2877 | elf32_arm_size_dynamic_sections (output_bfd, info) | |
2878 | bfd * output_bfd; | |
2879 | struct bfd_link_info * info; | |
2880 | { | |
2881 | bfd * dynobj; | |
2882 | asection * s; | |
2883 | boolean plt; | |
2884 | boolean relocs; | |
2885 | boolean reltext; | |
2886 | ||
2887 | dynobj = elf_hash_table (info)->dynobj; | |
2888 | BFD_ASSERT (dynobj != NULL); | |
2889 | ||
2890 | if (elf_hash_table (info)->dynamic_sections_created) | |
2891 | { | |
2892 | /* Set the contents of the .interp section to the interpreter. */ | |
2893 | if (! info->shared) | |
2894 | { | |
2895 | s = bfd_get_section_by_name (dynobj, ".interp"); | |
2896 | BFD_ASSERT (s != NULL); | |
2897 | s->_raw_size = sizeof ELF_DYNAMIC_INTERPRETER; | |
2898 | s->contents = (unsigned char *) ELF_DYNAMIC_INTERPRETER; | |
2899 | } | |
2900 | } | |
2901 | else | |
2902 | { | |
2903 | /* We may have created entries in the .rel.got section. | |
2904 | However, if we are not creating the dynamic sections, we will | |
2905 | not actually use these entries. Reset the size of .rel.got, | |
2906 | which will cause it to get stripped from the output file | |
2907 | below. */ | |
2908 | s = bfd_get_section_by_name (dynobj, ".rel.got"); | |
2909 | if (s != NULL) | |
2910 | s->_raw_size = 0; | |
2911 | } | |
2912 | ||
2913 | /* If this is a -Bsymbolic shared link, then we need to discard all | |
2914 | PC relative relocs against symbols defined in a regular object. | |
2915 | We allocated space for them in the check_relocs routine, but we | |
2916 | will not fill them in in the relocate_section routine. */ | |
2917 | if (info->shared && info->symbolic) | |
2918 | elf32_arm_link_hash_traverse (elf32_arm_hash_table (info), | |
2919 | elf32_arm_discard_copies, | |
2920 | (PTR) NULL); | |
2921 | ||
2922 | /* The check_relocs and adjust_dynamic_symbol entry points have | |
2923 | determined the sizes of the various dynamic sections. Allocate | |
2924 | memory for them. */ | |
2925 | plt = false; | |
2926 | relocs = false; | |
2927 | reltext = false; | |
2928 | for (s = dynobj->sections; s != NULL; s = s->next) | |
2929 | { | |
2930 | const char * name; | |
2931 | boolean strip; | |
2932 | ||
2933 | if ((s->flags & SEC_LINKER_CREATED) == 0) | |
2934 | continue; | |
2935 | ||
2936 | /* It's OK to base decisions on the section name, because none | |
2937 | of the dynobj section names depend upon the input files. */ | |
2938 | name = bfd_get_section_name (dynobj, s); | |
2939 | ||
2940 | strip = false; | |
2941 | ||
2942 | if (strcmp (name, ".plt") == 0) | |
2943 | { | |
2944 | if (s->_raw_size == 0) | |
2945 | { | |
2946 | /* Strip this section if we don't need it; see the | |
2947 | comment below. */ | |
2948 | strip = true; | |
2949 | } | |
2950 | else | |
2951 | { | |
2952 | /* Remember whether there is a PLT. */ | |
2953 | plt = true; | |
2954 | } | |
2955 | } | |
2956 | else if (strncmp (name, ".rel", 4) == 0) | |
2957 | { | |
2958 | if (s->_raw_size == 0) | |
2959 | { | |
2960 | /* If we don't need this section, strip it from the | |
2961 | output file. This is mostly to handle .rel.bss and | |
2962 | .rel.plt. We must create both sections in | |
2963 | create_dynamic_sections, because they must be created | |
2964 | before the linker maps input sections to output | |
2965 | sections. The linker does that before | |
2966 | adjust_dynamic_symbol is called, and it is that | |
2967 | function which decides whether anything needs to go | |
2968 | into these sections. */ | |
2969 | strip = true; | |
2970 | } | |
2971 | else | |
2972 | { | |
2973 | asection * target; | |
2974 | ||
2975 | /* Remember whether there are any reloc sections other | |
2976 | than .rel.plt. */ | |
2977 | if (strcmp (name, ".rel.plt") != 0) | |
2978 | { | |
2979 | const char *outname; | |
2980 | ||
2981 | relocs = true; | |
2982 | ||
2983 | /* If this relocation section applies to a read only | |
2984 | section, then we probably need a DT_TEXTREL | |
2985 | entry. The entries in the .rel.plt section | |
2986 | really apply to the .got section, which we | |
2987 | created ourselves and so know is not readonly. */ | |
2988 | outname = bfd_get_section_name (output_bfd, | |
2989 | s->output_section); | |
2990 | target = bfd_get_section_by_name (output_bfd, outname + 4); | |
9a5aca8c | 2991 | |
252b5132 RH |
2992 | if (target != NULL |
2993 | && (target->flags & SEC_READONLY) != 0 | |
2994 | && (target->flags & SEC_ALLOC) != 0) | |
2995 | reltext = true; | |
2996 | } | |
2997 | ||
2998 | /* We use the reloc_count field as a counter if we need | |
2999 | to copy relocs into the output file. */ | |
3000 | s->reloc_count = 0; | |
3001 | } | |
3002 | } | |
3003 | else if (strncmp (name, ".got", 4) != 0) | |
3004 | { | |
3005 | /* It's not one of our sections, so don't allocate space. */ | |
3006 | continue; | |
3007 | } | |
3008 | ||
3009 | if (strip) | |
3010 | { | |
3011 | asection ** spp; | |
3012 | ||
3013 | for (spp = &s->output_section->owner->sections; | |
3014 | *spp != s->output_section; | |
3015 | spp = &(*spp)->next) | |
3016 | ; | |
3017 | *spp = s->output_section->next; | |
3018 | --s->output_section->owner->section_count; | |
3019 | ||
3020 | continue; | |
3021 | } | |
3022 | ||
3023 | /* Allocate memory for the section contents. */ | |
3024 | s->contents = (bfd_byte *) bfd_zalloc (dynobj, s->_raw_size); | |
3025 | if (s->contents == NULL && s->_raw_size != 0) | |
3026 | return false; | |
3027 | } | |
3028 | ||
3029 | if (elf_hash_table (info)->dynamic_sections_created) | |
3030 | { | |
3031 | /* Add some entries to the .dynamic section. We fill in the | |
3032 | values later, in elf32_arm_finish_dynamic_sections, but we | |
3033 | must add the entries now so that we get the correct size for | |
3034 | the .dynamic section. The DT_DEBUG entry is filled in by the | |
3035 | dynamic linker and used by the debugger. */ | |
3036 | if (! info->shared) | |
3037 | { | |
3038 | if (! bfd_elf32_add_dynamic_entry (info, DT_DEBUG, 0)) | |
3039 | return false; | |
3040 | } | |
3041 | ||
3042 | if (plt) | |
3043 | { | |
9b485d32 | 3044 | if ( ! bfd_elf32_add_dynamic_entry (info, DT_PLTGOT, 0) |
252b5132 RH |
3045 | || ! bfd_elf32_add_dynamic_entry (info, DT_PLTRELSZ, 0) |
3046 | || ! bfd_elf32_add_dynamic_entry (info, DT_PLTREL, DT_REL) | |
3047 | || ! bfd_elf32_add_dynamic_entry (info, DT_JMPREL, 0)) | |
3048 | return false; | |
3049 | } | |
3050 | ||
3051 | if (relocs) | |
3052 | { | |
9b485d32 | 3053 | if ( ! bfd_elf32_add_dynamic_entry (info, DT_REL, 0) |
252b5132 RH |
3054 | || ! bfd_elf32_add_dynamic_entry (info, DT_RELSZ, 0) |
3055 | || ! bfd_elf32_add_dynamic_entry (info, DT_RELENT, | |
3056 | sizeof (Elf32_External_Rel))) | |
3057 | return false; | |
3058 | } | |
3059 | ||
3060 | if (reltext) | |
3061 | { | |
3062 | if (! bfd_elf32_add_dynamic_entry (info, DT_TEXTREL, 0)) | |
3063 | return false; | |
d6cf2879 | 3064 | info->flags |= DF_TEXTREL; |
252b5132 RH |
3065 | } |
3066 | } | |
3067 | ||
3068 | return true; | |
3069 | } | |
3070 | ||
3071 | /* This function is called via elf32_arm_link_hash_traverse if we are | |
3072 | creating a shared object with -Bsymbolic. It discards the space | |
3073 | allocated to copy PC relative relocs against symbols which are | |
3074 | defined in regular objects. We allocated space for them in the | |
3075 | check_relocs routine, but we won't fill them in in the | |
3076 | relocate_section routine. */ | |
3077 | ||
3078 | static boolean | |
3079 | elf32_arm_discard_copies (h, ignore) | |
3080 | struct elf32_arm_link_hash_entry * h; | |
5f771d47 | 3081 | PTR ignore ATTRIBUTE_UNUSED; |
252b5132 RH |
3082 | { |
3083 | struct elf32_arm_pcrel_relocs_copied * s; | |
3084 | ||
3085 | /* We only discard relocs for symbols defined in a regular object. */ | |
3086 | if ((h->root.elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR) == 0) | |
3087 | return true; | |
3088 | ||
3089 | for (s = h->pcrel_relocs_copied; s != NULL; s = s->next) | |
3090 | s->section->_raw_size -= s->count * sizeof (Elf32_External_Rel); | |
3091 | ||
3092 | return true; | |
3093 | } | |
3094 | ||
3095 | /* Finish up dynamic symbol handling. We set the contents of various | |
3096 | dynamic sections here. */ | |
3097 | ||
3098 | static boolean | |
3099 | elf32_arm_finish_dynamic_symbol (output_bfd, info, h, sym) | |
3100 | bfd * output_bfd; | |
3101 | struct bfd_link_info * info; | |
3102 | struct elf_link_hash_entry * h; | |
3103 | Elf_Internal_Sym * sym; | |
3104 | { | |
3105 | bfd * dynobj; | |
3106 | ||
3107 | dynobj = elf_hash_table (info)->dynobj; | |
3108 | ||
3109 | if (h->plt.offset != (bfd_vma) -1) | |
3110 | { | |
3111 | asection * splt; | |
3112 | asection * sgot; | |
3113 | asection * srel; | |
3114 | bfd_vma plt_index; | |
3115 | bfd_vma got_offset; | |
3116 | Elf_Internal_Rel rel; | |
3117 | ||
3118 | /* This symbol has an entry in the procedure linkage table. Set | |
3119 | it up. */ | |
3120 | ||
3121 | BFD_ASSERT (h->dynindx != -1); | |
3122 | ||
3123 | splt = bfd_get_section_by_name (dynobj, ".plt"); | |
3124 | sgot = bfd_get_section_by_name (dynobj, ".got.plt"); | |
3125 | srel = bfd_get_section_by_name (dynobj, ".rel.plt"); | |
3126 | BFD_ASSERT (splt != NULL && sgot != NULL && srel != NULL); | |
3127 | ||
3128 | /* Get the index in the procedure linkage table which | |
3129 | corresponds to this symbol. This is the index of this symbol | |
3130 | in all the symbols for which we are making plt entries. The | |
3131 | first entry in the procedure linkage table is reserved. */ | |
3132 | plt_index = h->plt.offset / PLT_ENTRY_SIZE - 1; | |
3133 | ||
3134 | /* Get the offset into the .got table of the entry that | |
3135 | corresponds to this function. Each .got entry is 4 bytes. | |
3136 | The first three are reserved. */ | |
3137 | got_offset = (plt_index + 3) * 4; | |
3138 | ||
3139 | /* Fill in the entry in the procedure linkage table. */ | |
3140 | memcpy (splt->contents + h->plt.offset, | |
3141 | elf32_arm_plt_entry, | |
3142 | PLT_ENTRY_SIZE); | |
3143 | bfd_put_32 (output_bfd, | |
3144 | (sgot->output_section->vma | |
3145 | + sgot->output_offset | |
f21f3fe0 | 3146 | + got_offset |
252b5132 RH |
3147 | - splt->output_section->vma |
3148 | - splt->output_offset | |
3149 | - h->plt.offset - 12), | |
3150 | splt->contents + h->plt.offset + 12); | |
3151 | ||
3152 | /* Fill in the entry in the global offset table. */ | |
3153 | bfd_put_32 (output_bfd, | |
3154 | (splt->output_section->vma | |
3155 | + splt->output_offset), | |
3156 | sgot->contents + got_offset); | |
3157 | ||
3158 | /* Fill in the entry in the .rel.plt section. */ | |
3159 | rel.r_offset = (sgot->output_section->vma | |
3160 | + sgot->output_offset | |
3161 | + got_offset); | |
3162 | rel.r_info = ELF32_R_INFO (h->dynindx, R_ARM_JUMP_SLOT); | |
3163 | bfd_elf32_swap_reloc_out (output_bfd, &rel, | |
3164 | ((Elf32_External_Rel *) srel->contents | |
3165 | + plt_index)); | |
3166 | ||
3167 | if ((h->elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR) == 0) | |
3168 | { | |
3169 | /* Mark the symbol as undefined, rather than as defined in | |
3170 | the .plt section. Leave the value alone. */ | |
3171 | sym->st_shndx = SHN_UNDEF; | |
3172 | } | |
3173 | } | |
3174 | ||
3175 | if (h->got.offset != (bfd_vma) -1) | |
3176 | { | |
3177 | asection * sgot; | |
3178 | asection * srel; | |
3179 | Elf_Internal_Rel rel; | |
3180 | ||
3181 | /* This symbol has an entry in the global offset table. Set it | |
3182 | up. */ | |
252b5132 RH |
3183 | sgot = bfd_get_section_by_name (dynobj, ".got"); |
3184 | srel = bfd_get_section_by_name (dynobj, ".rel.got"); | |
3185 | BFD_ASSERT (sgot != NULL && srel != NULL); | |
3186 | ||
3187 | rel.r_offset = (sgot->output_section->vma | |
3188 | + sgot->output_offset | |
3189 | + (h->got.offset &~ 1)); | |
3190 | ||
3191 | /* If this is a -Bsymbolic link, and the symbol is defined | |
3192 | locally, we just want to emit a RELATIVE reloc. The entry in | |
3193 | the global offset table will already have been initialized in | |
3194 | the relocate_section function. */ | |
3195 | if (info->shared | |
3196 | && (info->symbolic || h->dynindx == -1) | |
3197 | && (h->elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR)) | |
3198 | rel.r_info = ELF32_R_INFO (0, R_ARM_RELATIVE); | |
3199 | else | |
3200 | { | |
3201 | bfd_put_32 (output_bfd, (bfd_vma) 0, sgot->contents + h->got.offset); | |
3202 | rel.r_info = ELF32_R_INFO (h->dynindx, R_ARM_GLOB_DAT); | |
3203 | } | |
3204 | ||
3205 | bfd_elf32_swap_reloc_out (output_bfd, &rel, | |
3206 | ((Elf32_External_Rel *) srel->contents | |
3207 | + srel->reloc_count)); | |
3208 | ++srel->reloc_count; | |
3209 | } | |
3210 | ||
3211 | if ((h->elf_link_hash_flags & ELF_LINK_HASH_NEEDS_COPY) != 0) | |
3212 | { | |
3213 | asection * s; | |
3214 | Elf_Internal_Rel rel; | |
3215 | ||
3216 | /* This symbol needs a copy reloc. Set it up. */ | |
252b5132 RH |
3217 | BFD_ASSERT (h->dynindx != -1 |
3218 | && (h->root.type == bfd_link_hash_defined | |
3219 | || h->root.type == bfd_link_hash_defweak)); | |
3220 | ||
3221 | s = bfd_get_section_by_name (h->root.u.def.section->owner, | |
3222 | ".rel.bss"); | |
3223 | BFD_ASSERT (s != NULL); | |
3224 | ||
3225 | rel.r_offset = (h->root.u.def.value | |
3226 | + h->root.u.def.section->output_section->vma | |
3227 | + h->root.u.def.section->output_offset); | |
3228 | rel.r_info = ELF32_R_INFO (h->dynindx, R_ARM_COPY); | |
3229 | bfd_elf32_swap_reloc_out (output_bfd, &rel, | |
3230 | ((Elf32_External_Rel *) s->contents | |
3231 | + s->reloc_count)); | |
3232 | ++s->reloc_count; | |
3233 | } | |
3234 | ||
3235 | /* Mark _DYNAMIC and _GLOBAL_OFFSET_TABLE_ as absolute. */ | |
3236 | if (strcmp (h->root.root.string, "_DYNAMIC") == 0 | |
3237 | || strcmp (h->root.root.string, "_GLOBAL_OFFSET_TABLE_") == 0) | |
3238 | sym->st_shndx = SHN_ABS; | |
3239 | ||
3240 | return true; | |
3241 | } | |
3242 | ||
3243 | /* Finish up the dynamic sections. */ | |
3244 | ||
3245 | static boolean | |
3246 | elf32_arm_finish_dynamic_sections (output_bfd, info) | |
3247 | bfd * output_bfd; | |
3248 | struct bfd_link_info * info; | |
3249 | { | |
3250 | bfd * dynobj; | |
3251 | asection * sgot; | |
3252 | asection * sdyn; | |
3253 | ||
3254 | dynobj = elf_hash_table (info)->dynobj; | |
3255 | ||
3256 | sgot = bfd_get_section_by_name (dynobj, ".got.plt"); | |
3257 | BFD_ASSERT (sgot != NULL); | |
3258 | sdyn = bfd_get_section_by_name (dynobj, ".dynamic"); | |
3259 | ||
3260 | if (elf_hash_table (info)->dynamic_sections_created) | |
3261 | { | |
3262 | asection *splt; | |
3263 | Elf32_External_Dyn *dyncon, *dynconend; | |
3264 | ||
3265 | splt = bfd_get_section_by_name (dynobj, ".plt"); | |
3266 | BFD_ASSERT (splt != NULL && sdyn != NULL); | |
3267 | ||
3268 | dyncon = (Elf32_External_Dyn *) sdyn->contents; | |
3269 | dynconend = (Elf32_External_Dyn *) (sdyn->contents + sdyn->_raw_size); | |
9b485d32 | 3270 | |
252b5132 RH |
3271 | for (; dyncon < dynconend; dyncon++) |
3272 | { | |
3273 | Elf_Internal_Dyn dyn; | |
3274 | const char * name; | |
3275 | asection * s; | |
3276 | ||
3277 | bfd_elf32_swap_dyn_in (dynobj, dyncon, &dyn); | |
3278 | ||
3279 | switch (dyn.d_tag) | |
3280 | { | |
3281 | default: | |
3282 | break; | |
3283 | ||
3284 | case DT_PLTGOT: | |
3285 | name = ".got"; | |
3286 | goto get_vma; | |
3287 | case DT_JMPREL: | |
3288 | name = ".rel.plt"; | |
3289 | get_vma: | |
3290 | s = bfd_get_section_by_name (output_bfd, name); | |
3291 | BFD_ASSERT (s != NULL); | |
3292 | dyn.d_un.d_ptr = s->vma; | |
3293 | bfd_elf32_swap_dyn_out (output_bfd, &dyn, dyncon); | |
3294 | break; | |
3295 | ||
3296 | case DT_PLTRELSZ: | |
3297 | s = bfd_get_section_by_name (output_bfd, ".rel.plt"); | |
3298 | BFD_ASSERT (s != NULL); | |
3299 | if (s->_cooked_size != 0) | |
3300 | dyn.d_un.d_val = s->_cooked_size; | |
3301 | else | |
3302 | dyn.d_un.d_val = s->_raw_size; | |
3303 | bfd_elf32_swap_dyn_out (output_bfd, &dyn, dyncon); | |
3304 | break; | |
3305 | ||
3306 | case DT_RELSZ: | |
3307 | /* My reading of the SVR4 ABI indicates that the | |
3308 | procedure linkage table relocs (DT_JMPREL) should be | |
3309 | included in the overall relocs (DT_REL). This is | |
3310 | what Solaris does. However, UnixWare can not handle | |
3311 | that case. Therefore, we override the DT_RELSZ entry | |
3312 | here to make it not include the JMPREL relocs. Since | |
3313 | the linker script arranges for .rel.plt to follow all | |
3314 | other relocation sections, we don't have to worry | |
3315 | about changing the DT_REL entry. */ | |
3316 | s = bfd_get_section_by_name (output_bfd, ".rel.plt"); | |
3317 | if (s != NULL) | |
3318 | { | |
3319 | if (s->_cooked_size != 0) | |
3320 | dyn.d_un.d_val -= s->_cooked_size; | |
3321 | else | |
3322 | dyn.d_un.d_val -= s->_raw_size; | |
3323 | } | |
3324 | bfd_elf32_swap_dyn_out (output_bfd, &dyn, dyncon); | |
3325 | break; | |
3326 | } | |
3327 | } | |
3328 | ||
3329 | /* Fill in the first entry in the procedure linkage table. */ | |
3330 | if (splt->_raw_size > 0) | |
3331 | memcpy (splt->contents, elf32_arm_plt0_entry, PLT_ENTRY_SIZE); | |
3332 | ||
3333 | /* UnixWare sets the entsize of .plt to 4, although that doesn't | |
3334 | really seem like the right value. */ | |
3335 | elf_section_data (splt->output_section)->this_hdr.sh_entsize = 4; | |
3336 | } | |
3337 | ||
3338 | /* Fill in the first three entries in the global offset table. */ | |
3339 | if (sgot->_raw_size > 0) | |
3340 | { | |
3341 | if (sdyn == NULL) | |
3342 | bfd_put_32 (output_bfd, (bfd_vma) 0, sgot->contents); | |
3343 | else | |
3344 | bfd_put_32 (output_bfd, | |
3345 | sdyn->output_section->vma + sdyn->output_offset, | |
3346 | sgot->contents); | |
3347 | bfd_put_32 (output_bfd, (bfd_vma) 0, sgot->contents + 4); | |
3348 | bfd_put_32 (output_bfd, (bfd_vma) 0, sgot->contents + 8); | |
3349 | } | |
3350 | ||
3351 | elf_section_data (sgot->output_section)->this_hdr.sh_entsize = 4; | |
3352 | ||
3353 | return true; | |
3354 | } | |
3355 | ||
ba96a88f NC |
3356 | static void |
3357 | elf32_arm_post_process_headers (abfd, link_info) | |
3358 | bfd * abfd; | |
5f771d47 | 3359 | struct bfd_link_info * link_info ATTRIBUTE_UNUSED; |
ba96a88f | 3360 | { |
9b485d32 | 3361 | Elf_Internal_Ehdr * i_ehdrp; /* ELF file header, internal form. */ |
ba96a88f NC |
3362 | |
3363 | i_ehdrp = elf_elfheader (abfd); | |
3364 | ||
3365 | i_ehdrp->e_ident[EI_OSABI] = ARM_ELF_OS_ABI_VERSION; | |
3366 | i_ehdrp->e_ident[EI_ABIVERSION] = ARM_ELF_ABI_VERSION; | |
3367 | } | |
3368 | ||
3369 | ||
252b5132 RH |
3370 | #define ELF_ARCH bfd_arch_arm |
3371 | #define ELF_MACHINE_CODE EM_ARM | |
f21f3fe0 | 3372 | #define ELF_MAXPAGESIZE 0x8000 |
252b5132 RH |
3373 | |
3374 | ||
3375 | #define bfd_elf32_bfd_copy_private_bfd_data elf32_arm_copy_private_bfd_data | |
3376 | #define bfd_elf32_bfd_merge_private_bfd_data elf32_arm_merge_private_bfd_data | |
3377 | #define bfd_elf32_bfd_set_private_flags elf32_arm_set_private_flags | |
3378 | #define bfd_elf32_bfd_print_private_bfd_data elf32_arm_print_private_bfd_data | |
3379 | #define bfd_elf32_bfd_link_hash_table_create elf32_arm_link_hash_table_create | |
3380 | #define bfd_elf32_bfd_reloc_type_lookup elf32_arm_reloc_type_lookup | |
3381 | #define bfd_elf32_find_nearest_line elf32_arm_find_nearest_line | |
3382 | ||
3383 | #define elf_backend_get_symbol_type elf32_arm_get_symbol_type | |
3384 | #define elf_backend_gc_mark_hook elf32_arm_gc_mark_hook | |
3385 | #define elf_backend_gc_sweep_hook elf32_arm_gc_sweep_hook | |
3386 | #define elf_backend_check_relocs elf32_arm_check_relocs | |
3387 | #define elf_backend_relocate_section elf32_arm_relocate_section | |
3388 | #define elf_backend_adjust_dynamic_symbol elf32_arm_adjust_dynamic_symbol | |
3389 | #define elf_backend_create_dynamic_sections _bfd_elf_create_dynamic_sections | |
3390 | #define elf_backend_finish_dynamic_symbol elf32_arm_finish_dynamic_symbol | |
3391 | #define elf_backend_finish_dynamic_sections elf32_arm_finish_dynamic_sections | |
3392 | #define elf_backend_size_dynamic_sections elf32_arm_size_dynamic_sections | |
ba96a88f | 3393 | #define elf_backend_post_process_headers elf32_arm_post_process_headers |
252b5132 RH |
3394 | |
3395 | #define elf_backend_can_gc_sections 1 | |
3396 | #define elf_backend_plt_readonly 1 | |
3397 | #define elf_backend_want_got_plt 1 | |
3398 | #define elf_backend_want_plt_sym 0 | |
3399 | ||
04f7c78d NC |
3400 | #define elf_backend_got_header_size 12 |
3401 | #define elf_backend_plt_header_size PLT_ENTRY_SIZE | |
3402 | ||
252b5132 | 3403 | #include "elf32-target.h" |