Commit | Line | Data |
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252b5132 | 1 | /* D10V-specific support for 32-bit ELF |
638632bd | 2 | Copyright (C) 1996, 1998, 1999, 2000 Free Software Foundation, Inc. |
252b5132 RH |
3 | Contributed by Martin Hunt (hunt@cygnus.com). |
4 | ||
5 | This file is part of BFD, the Binary File Descriptor library. | |
6 | ||
7 | This program is free software; you can redistribute it and/or modify | |
8 | it under the terms of the GNU General Public License as published by | |
9 | the Free Software Foundation; either version 2 of the License, or | |
10 | (at your option) any later version. | |
11 | ||
12 | This program is distributed in the hope that it will be useful, | |
13 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
14 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
15 | GNU General Public License for more details. | |
16 | ||
17 | You should have received a copy of the GNU General Public License | |
18 | along with this program; if not, write to the Free Software | |
19 | Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */ | |
20 | ||
21 | #include "bfd.h" | |
22 | #include "sysdep.h" | |
23 | #include "libbfd.h" | |
24 | #include "elf-bfd.h" | |
1b452ec6 | 25 | #include "elf/d10v.h" |
252b5132 RH |
26 | |
27 | static reloc_howto_type *bfd_elf32_bfd_reloc_type_lookup | |
28 | PARAMS ((bfd *abfd, bfd_reloc_code_real_type code)); | |
29 | static void d10v_info_to_howto_rel | |
30 | PARAMS ((bfd *, arelent *, Elf32_Internal_Rel *)); | |
31 | ||
32 | ||
33 | /* Use REL instead of RELA to save space */ | |
34 | #define USE_REL | |
35 | ||
252b5132 RH |
36 | static reloc_howto_type elf_d10v_howto_table[] = |
37 | { | |
38 | /* This reloc does nothing. */ | |
39 | HOWTO (R_D10V_NONE, /* type */ | |
40 | 0, /* rightshift */ | |
41 | 2, /* size (0 = byte, 1 = short, 2 = long) */ | |
42 | 32, /* bitsize */ | |
43 | false, /* pc_relative */ | |
44 | 0, /* bitpos */ | |
45 | complain_overflow_bitfield, /* complain_on_overflow */ | |
46 | bfd_elf_generic_reloc, /* special_function */ | |
47 | "R_D10V_NONE", /* name */ | |
48 | false, /* partial_inplace */ | |
49 | 0, /* src_mask */ | |
50 | 0, /* dst_mask */ | |
51 | false), /* pcrel_offset */ | |
52 | ||
53 | /* An PC Relative 10-bit relocation, shifted by 2 */ | |
54 | /* right container */ | |
55 | HOWTO (R_D10V_10_PCREL_R, /* type */ | |
56 | 2, /* rightshift */ | |
57 | 2, /* size (0 = byte, 1 = short, 2 = long) */ | |
58 | 10, /* bitsize */ | |
59 | true, /* pc_relative */ | |
60 | 0, /* bitpos */ | |
61 | complain_overflow_bitfield, /* complain_on_overflow */ | |
62 | bfd_elf_generic_reloc, /* special_function */ | |
63 | "R_D10V_10_PCREL_R", /* name */ | |
64 | false, /* partial_inplace */ | |
65 | 0xff, /* src_mask */ | |
66 | 0xff, /* dst_mask */ | |
67 | true), /* pcrel_offset */ | |
68 | ||
69 | /* An PC Relative 10-bit relocation, shifted by 2 */ | |
70 | /* left container */ | |
71 | HOWTO (R_D10V_10_PCREL_L, /* type */ | |
72 | 2, /* rightshift */ | |
73 | 2, /* size (0 = byte, 1 = short, 2 = long) */ | |
74 | 10, /* bitsize */ | |
75 | true, /* pc_relative */ | |
76 | 15, /* bitpos */ | |
77 | complain_overflow_bitfield, /* complain_on_overflow */ | |
78 | bfd_elf_generic_reloc, /* special_function */ | |
79 | "R_D10V_10_PCREL_L", /* name */ | |
80 | false, /* partial_inplace */ | |
81 | 0x07f8000, /* src_mask */ | |
82 | 0x07f8000, /* dst_mask */ | |
83 | true), /* pcrel_offset */ | |
84 | ||
85 | /* A 16 bit absolute relocation */ | |
86 | HOWTO (R_D10V_16, /* type */ | |
87 | 0, /* rightshift */ | |
88 | 1, /* size (0 = byte, 1 = short, 2 = long) */ | |
89 | 16, /* bitsize */ | |
90 | false, /* pc_relative */ | |
91 | 0, /* bitpos */ | |
92 | complain_overflow_dont, /* complain_on_overflow */ | |
93 | bfd_elf_generic_reloc, /* special_function */ | |
94 | "R_D10V_16", /* name */ | |
95 | false, /* partial_inplace */ | |
96 | 0xffff, /* src_mask */ | |
97 | 0xffff, /* dst_mask */ | |
98 | false), /* pcrel_offset */ | |
99 | ||
100 | /* An 18 bit absolute relocation, right shifted 2 */ | |
101 | HOWTO (R_D10V_18, /* type */ | |
102 | 2, /* rightshift */ | |
103 | 1, /* size (0 = byte, 1 = short, 2 = long) */ | |
104 | 18, /* bitsize */ | |
105 | false, /* pc_relative */ | |
106 | 0, /* bitpos */ | |
107 | complain_overflow_dont, /* complain_on_overflow */ | |
108 | bfd_elf_generic_reloc, /* special_function */ | |
109 | "R_D10V_18", /* name */ | |
110 | false, /* partial_inplace */ | |
111 | 0xffff, /* src_mask */ | |
112 | 0xffff, /* dst_mask */ | |
113 | false), /* pcrel_offset */ | |
114 | ||
115 | /* A relative 18 bit relocation, right shifted by 2 */ | |
116 | HOWTO (R_D10V_18_PCREL, /* type */ | |
117 | 2, /* rightshift */ | |
118 | 2, /* size (0 = byte, 1 = short, 2 = long) */ | |
119 | 18, /* bitsize */ | |
120 | true, /* pc_relative */ | |
121 | 0, /* bitpos */ | |
122 | complain_overflow_signed, /* complain_on_overflow */ | |
123 | bfd_elf_generic_reloc, /* special_function */ | |
124 | "R_D10V_18_PCREL", /* name */ | |
125 | false, /* partial_inplace */ | |
126 | 0xffff, /* src_mask */ | |
127 | 0xffff, /* dst_mask */ | |
128 | true), /* pcrel_offset */ | |
129 | ||
130 | /* A 32 bit absolute relocation */ | |
131 | HOWTO (R_D10V_32, /* type */ | |
132 | 0, /* rightshift */ | |
133 | 2, /* size (0 = byte, 1 = short, 2 = long) */ | |
134 | 32, /* bitsize */ | |
135 | false, /* pc_relative */ | |
136 | 0, /* bitpos */ | |
137 | complain_overflow_bitfield, /* complain_on_overflow */ | |
138 | bfd_elf_generic_reloc, /* special_function */ | |
139 | "R_D10V_32", /* name */ | |
140 | false, /* partial_inplace */ | |
141 | 0xffffffff, /* src_mask */ | |
142 | 0xffffffff, /* dst_mask */ | |
143 | false), /* pcrel_offset */ | |
144 | ||
145 | /* GNU extension to record C++ vtable hierarchy */ | |
146 | HOWTO (R_D10V_GNU_VTINHERIT, /* type */ | |
147 | 0, /* rightshift */ | |
148 | 2, /* size (0 = byte, 1 = short, 2 = long) */ | |
149 | 0, /* bitsize */ | |
150 | false, /* pc_relative */ | |
151 | 0, /* bitpos */ | |
152 | complain_overflow_dont, /* complain_on_overflow */ | |
153 | NULL, /* special_function */ | |
154 | "R_D10V_GNU_VTINHERIT", /* name */ | |
155 | false, /* partial_inplace */ | |
156 | 0, /* src_mask */ | |
157 | 0, /* dst_mask */ | |
158 | false), /* pcrel_offset */ | |
159 | ||
160 | /* GNU extension to record C++ vtable member usage */ | |
161 | HOWTO (R_D10V_GNU_VTENTRY, /* type */ | |
162 | 0, /* rightshift */ | |
163 | 2, /* size (0 = byte, 1 = short, 2 = long) */ | |
164 | 0, /* bitsize */ | |
165 | false, /* pc_relative */ | |
166 | 0, /* bitpos */ | |
167 | complain_overflow_dont, /* complain_on_overflow */ | |
168 | _bfd_elf_rel_vtable_reloc_fn, /* special_function */ | |
169 | "R_D10V_GNU_VTENTRY", /* name */ | |
170 | false, /* partial_inplace */ | |
171 | 0, /* src_mask */ | |
172 | 0, /* dst_mask */ | |
173 | false), /* pcrel_offset */ | |
174 | ||
175 | }; | |
176 | ||
177 | /* Map BFD reloc types to D10V ELF reloc types. */ | |
178 | ||
179 | struct d10v_reloc_map | |
180 | { | |
181 | bfd_reloc_code_real_type bfd_reloc_val; | |
182 | unsigned char elf_reloc_val; | |
183 | }; | |
184 | ||
185 | static const struct d10v_reloc_map d10v_reloc_map[] = | |
186 | { | |
187 | { BFD_RELOC_NONE, R_D10V_NONE, }, | |
188 | { BFD_RELOC_D10V_10_PCREL_R, R_D10V_10_PCREL_R }, | |
189 | { BFD_RELOC_D10V_10_PCREL_L, R_D10V_10_PCREL_L }, | |
190 | { BFD_RELOC_16, R_D10V_16 }, | |
191 | { BFD_RELOC_D10V_18, R_D10V_18 }, | |
192 | { BFD_RELOC_D10V_18_PCREL, R_D10V_18_PCREL }, | |
193 | { BFD_RELOC_32, R_D10V_32 }, | |
194 | { BFD_RELOC_VTABLE_INHERIT, R_D10V_GNU_VTINHERIT }, | |
195 | { BFD_RELOC_VTABLE_ENTRY, R_D10V_GNU_VTENTRY }, | |
196 | }; | |
197 | ||
198 | static reloc_howto_type * | |
199 | bfd_elf32_bfd_reloc_type_lookup (abfd, code) | |
5f771d47 | 200 | bfd *abfd ATTRIBUTE_UNUSED; |
252b5132 RH |
201 | bfd_reloc_code_real_type code; |
202 | { | |
203 | unsigned int i; | |
204 | ||
205 | for (i = 0; | |
206 | i < sizeof (d10v_reloc_map) / sizeof (struct d10v_reloc_map); | |
207 | i++) | |
208 | { | |
209 | if (d10v_reloc_map[i].bfd_reloc_val == code) | |
210 | return &elf_d10v_howto_table[d10v_reloc_map[i].elf_reloc_val]; | |
211 | } | |
212 | ||
213 | return NULL; | |
214 | } | |
215 | ||
216 | /* Set the howto pointer for an D10V ELF reloc. */ | |
217 | ||
218 | static void | |
219 | d10v_info_to_howto_rel (abfd, cache_ptr, dst) | |
5f771d47 | 220 | bfd *abfd ATTRIBUTE_UNUSED; |
252b5132 RH |
221 | arelent *cache_ptr; |
222 | Elf32_Internal_Rel *dst; | |
223 | { | |
224 | unsigned int r_type; | |
225 | ||
226 | r_type = ELF32_R_TYPE (dst->r_info); | |
227 | BFD_ASSERT (r_type < (unsigned int) R_D10V_max); | |
228 | cache_ptr->howto = &elf_d10v_howto_table[r_type]; | |
229 | } | |
230 | ||
231 | static asection * | |
232 | elf32_d10v_gc_mark_hook (abfd, info, rel, h, sym) | |
233 | bfd *abfd; | |
5f771d47 | 234 | struct bfd_link_info *info ATTRIBUTE_UNUSED; |
252b5132 RH |
235 | Elf_Internal_Rela *rel; |
236 | struct elf_link_hash_entry *h; | |
237 | Elf_Internal_Sym *sym; | |
238 | { | |
239 | if (h != NULL) | |
240 | { | |
241 | switch (ELF32_R_TYPE (rel->r_info)) | |
242 | { | |
243 | case R_D10V_GNU_VTINHERIT: | |
244 | case R_D10V_GNU_VTENTRY: | |
245 | break; | |
246 | ||
247 | default: | |
248 | switch (h->root.type) | |
249 | { | |
250 | case bfd_link_hash_defined: | |
251 | case bfd_link_hash_defweak: | |
252 | return h->root.u.def.section; | |
253 | ||
254 | case bfd_link_hash_common: | |
255 | return h->root.u.c.p->section; | |
e049a0de ILT |
256 | |
257 | default: | |
258 | break; | |
252b5132 RH |
259 | } |
260 | } | |
261 | } | |
262 | else | |
263 | { | |
264 | if (!(elf_bad_symtab (abfd) | |
265 | && ELF_ST_BIND (sym->st_info) != STB_LOCAL) | |
266 | && ! ((sym->st_shndx <= 0 || sym->st_shndx >= SHN_LORESERVE) | |
267 | && sym->st_shndx != SHN_COMMON)) | |
268 | { | |
269 | return bfd_section_from_elf_index (abfd, sym->st_shndx); | |
270 | } | |
271 | } | |
272 | return NULL; | |
273 | } | |
274 | ||
275 | static boolean | |
276 | elf32_d10v_gc_sweep_hook (abfd, info, sec, relocs) | |
5f771d47 ILT |
277 | bfd *abfd ATTRIBUTE_UNUSED; |
278 | struct bfd_link_info *info ATTRIBUTE_UNUSED; | |
279 | asection *sec ATTRIBUTE_UNUSED; | |
280 | const Elf_Internal_Rela *relocs ATTRIBUTE_UNUSED; | |
252b5132 RH |
281 | { |
282 | /* we don't use got and plt entries for d10v */ | |
283 | return true; | |
284 | } | |
285 | ||
286 | /* Look through the relocs for a section during the first phase. | |
287 | Since we don't do .gots or .plts, we just need to consider the | |
288 | virtual table relocs for gc. */ | |
289 | ||
290 | static boolean | |
291 | elf32_d10v_check_relocs (abfd, info, sec, relocs) | |
292 | bfd *abfd; | |
293 | struct bfd_link_info *info; | |
294 | asection *sec; | |
295 | const Elf_Internal_Rela *relocs; | |
296 | { | |
297 | Elf_Internal_Shdr *symtab_hdr; | |
298 | struct elf_link_hash_entry **sym_hashes, **sym_hashes_end; | |
299 | const Elf_Internal_Rela *rel; | |
300 | const Elf_Internal_Rela *rel_end; | |
301 | ||
302 | if (info->relocateable) | |
303 | return true; | |
304 | ||
305 | symtab_hdr = &elf_tdata (abfd)->symtab_hdr; | |
306 | sym_hashes = elf_sym_hashes (abfd); | |
307 | sym_hashes_end = sym_hashes + symtab_hdr->sh_size/sizeof(Elf32_External_Sym); | |
308 | if (!elf_bad_symtab (abfd)) | |
309 | sym_hashes_end -= symtab_hdr->sh_info; | |
310 | ||
311 | rel_end = relocs + sec->reloc_count; | |
312 | for (rel = relocs; rel < rel_end; rel++) | |
313 | { | |
314 | struct elf_link_hash_entry *h; | |
315 | unsigned long r_symndx; | |
316 | ||
317 | r_symndx = ELF32_R_SYM (rel->r_info); | |
318 | if (r_symndx < symtab_hdr->sh_info) | |
319 | h = NULL; | |
320 | else | |
321 | h = sym_hashes[r_symndx - symtab_hdr->sh_info]; | |
322 | ||
323 | switch (ELF32_R_TYPE (rel->r_info)) | |
324 | { | |
325 | /* This relocation describes the C++ object vtable hierarchy. | |
326 | Reconstruct it for later use during GC. */ | |
327 | case R_D10V_GNU_VTINHERIT: | |
328 | if (!_bfd_elf32_gc_record_vtinherit (abfd, sec, h, rel->r_offset)) | |
329 | return false; | |
330 | break; | |
331 | ||
332 | /* This relocation describes which C++ vtable entries are actually | |
333 | used. Record for later use during GC. */ | |
334 | case R_D10V_GNU_VTENTRY: | |
335 | if (!_bfd_elf32_gc_record_vtentry (abfd, sec, h, rel->r_offset)) | |
336 | return false; | |
337 | break; | |
338 | } | |
339 | } | |
340 | ||
341 | return true; | |
342 | } | |
343 | ||
344 | /* Relocate a D10V ELF section. */ | |
345 | static boolean | |
346 | elf32_d10v_relocate_section (output_bfd, info, input_bfd, input_section, | |
347 | contents, relocs, local_syms, local_sections) | |
5f771d47 | 348 | bfd *output_bfd ATTRIBUTE_UNUSED; |
252b5132 RH |
349 | struct bfd_link_info *info; |
350 | bfd *input_bfd; | |
351 | asection *input_section; | |
352 | bfd_byte *contents; | |
353 | Elf_Internal_Rela *relocs; | |
354 | Elf_Internal_Sym *local_syms; | |
355 | asection **local_sections; | |
356 | { | |
357 | Elf_Internal_Shdr *symtab_hdr; | |
358 | struct elf_link_hash_entry **sym_hashes; | |
359 | Elf_Internal_Rela *rel, *relend; | |
360 | const char *name; | |
361 | ||
362 | symtab_hdr = &elf_tdata (input_bfd)->symtab_hdr; | |
363 | sym_hashes = elf_sym_hashes (input_bfd); | |
364 | ||
365 | rel = relocs; | |
366 | relend = relocs + input_section->reloc_count; | |
367 | for (; rel < relend; rel++) | |
368 | { | |
369 | int r_type; | |
370 | reloc_howto_type *howto; | |
371 | unsigned long r_symndx; | |
372 | Elf_Internal_Sym *sym; | |
373 | asection *sec; | |
374 | struct elf_link_hash_entry *h; | |
375 | bfd_vma relocation; | |
376 | bfd_reloc_status_type r; | |
377 | ||
378 | r_symndx = ELF32_R_SYM (rel->r_info); | |
379 | r_type = ELF32_R_TYPE (rel->r_info); | |
380 | ||
381 | if (r_type == R_D10V_GNU_VTENTRY | |
382 | || r_type == R_D10V_GNU_VTINHERIT ) | |
383 | continue; | |
384 | ||
385 | howto = elf_d10v_howto_table + r_type; | |
386 | ||
387 | if (info->relocateable) | |
388 | { | |
389 | /* This is a relocateable link. We don't have to change | |
390 | anything, unless the reloc is against a section symbol, | |
391 | in which case we have to adjust according to where the | |
392 | section symbol winds up in the output section. */ | |
393 | if (r_symndx < symtab_hdr->sh_info) | |
394 | { | |
395 | sym = local_syms + r_symndx; | |
396 | if (ELF_ST_TYPE (sym->st_info) == STT_SECTION) | |
397 | { | |
398 | sec = local_sections[r_symndx]; | |
399 | rel->r_addend += sec->output_offset + sym->st_value; | |
400 | } | |
401 | } | |
402 | ||
403 | continue; | |
404 | } | |
405 | ||
406 | /* This is a final link. */ | |
407 | h = NULL; | |
408 | sym = NULL; | |
409 | sec = NULL; | |
410 | if (r_symndx < symtab_hdr->sh_info) | |
411 | { | |
412 | sym = local_syms + r_symndx; | |
413 | sec = local_sections[r_symndx]; | |
414 | relocation = (sec->output_section->vma | |
415 | + sec->output_offset | |
416 | + sym->st_value); | |
417 | } | |
418 | else | |
419 | { | |
420 | h = sym_hashes[r_symndx - symtab_hdr->sh_info]; | |
421 | while (h->root.type == bfd_link_hash_indirect | |
422 | || h->root.type == bfd_link_hash_warning) | |
423 | h = (struct elf_link_hash_entry *) h->root.u.i.link; | |
424 | if (h->root.type == bfd_link_hash_defined | |
425 | || h->root.type == bfd_link_hash_defweak) | |
426 | { | |
427 | sec = h->root.u.def.section; | |
428 | relocation = (h->root.u.def.value | |
429 | + sec->output_section->vma | |
430 | + sec->output_offset); | |
431 | } | |
432 | else if (h->root.type == bfd_link_hash_undefweak) | |
433 | relocation = 0; | |
434 | else | |
435 | { | |
436 | if (!((*info->callbacks->undefined_symbol) | |
437 | (info, h->root.root.string, input_bfd, | |
5cc7c785 | 438 | input_section, rel->r_offset, true))) |
252b5132 RH |
439 | return false; |
440 | relocation = 0; | |
441 | } | |
442 | } | |
443 | ||
444 | if (h != NULL) | |
445 | name = h->root.root.string; | |
446 | else | |
447 | { | |
448 | name = (bfd_elf_string_from_elf_section | |
449 | (input_bfd, symtab_hdr->sh_link, sym->st_name)); | |
450 | if (name == NULL || *name == '\0') | |
451 | name = bfd_section_name (input_bfd, sec); | |
452 | } | |
453 | ||
454 | r = _bfd_final_link_relocate (howto, input_bfd, input_section, | |
455 | contents, rel->r_offset, | |
456 | relocation, rel->r_addend); | |
457 | ||
458 | if (r != bfd_reloc_ok) | |
459 | { | |
460 | const char * msg = (const char *) 0; | |
461 | ||
462 | switch (r) | |
463 | { | |
464 | case bfd_reloc_overflow: | |
465 | if (!((*info->callbacks->reloc_overflow) | |
466 | (info, name, howto->name, (bfd_vma) 0, | |
467 | input_bfd, input_section, rel->r_offset))) | |
468 | return false; | |
469 | break; | |
470 | ||
471 | case bfd_reloc_undefined: | |
472 | if (!((*info->callbacks->undefined_symbol) | |
473 | (info, name, input_bfd, input_section, | |
5cc7c785 | 474 | rel->r_offset, true))) |
252b5132 RH |
475 | return false; |
476 | break; | |
477 | ||
478 | case bfd_reloc_outofrange: | |
479 | msg = _ ("internal error: out of range error"); | |
480 | goto common_error; | |
481 | ||
482 | case bfd_reloc_notsupported: | |
483 | msg = _ ("internal error: unsupported relocation error"); | |
484 | goto common_error; | |
485 | ||
486 | case bfd_reloc_dangerous: | |
487 | msg = _ ("internal error: dangerous error"); | |
488 | goto common_error; | |
489 | ||
490 | default: | |
491 | msg = _ ("internal error: unknown error"); | |
492 | /* fall through */ | |
493 | ||
494 | common_error: | |
495 | if (!((*info->callbacks->warning) | |
496 | (info, msg, name, input_bfd, input_section, | |
497 | rel->r_offset))) | |
498 | return false; | |
499 | break; | |
500 | } | |
501 | } | |
502 | } | |
503 | ||
504 | return true; | |
505 | } | |
506 | #define ELF_ARCH bfd_arch_d10v | |
507 | #define ELF_MACHINE_CODE EM_CYGNUS_D10V | |
508 | #define ELF_MAXPAGESIZE 0x1000 | |
509 | ||
510 | #define TARGET_BIG_SYM bfd_elf32_d10v_vec | |
511 | #define TARGET_BIG_NAME "elf32-d10v" | |
512 | ||
513 | #define elf_info_to_howto 0 | |
514 | #define elf_info_to_howto_rel d10v_info_to_howto_rel | |
515 | #define elf_backend_object_p 0 | |
516 | #define elf_backend_final_write_processing 0 | |
517 | #define elf_backend_gc_mark_hook elf32_d10v_gc_mark_hook | |
518 | #define elf_backend_gc_sweep_hook elf32_d10v_gc_sweep_hook | |
519 | #define elf_backend_check_relocs elf32_d10v_check_relocs | |
520 | #define elf_backend_relocate_section elf32_d10v_relocate_section | |
521 | #define elf_backend_can_gc_sections 1 | |
522 | ||
523 | #include "elf32-target.h" |