Commit | Line | Data |
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b3baf5d0 | 1 | /* OpenRISC-specific support for 32-bit ELF. |
dc810e39 | 2 | Copyright 2001 Free Software Foundation, Inc. |
b3baf5d0 NC |
3 | Contributed by Johan Rydberg, jrydberg@opencores.org |
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" | |
25 | #include "elf/openrisc.h" | |
26 | #include "libiberty.h" | |
27 | ||
28 | /* Forward declarations. */ | |
29 | ||
30 | static reloc_howto_type *openrisc_reloc_type_lookup | |
31 | PARAMS ((bfd * , bfd_reloc_code_real_type)); | |
32 | static void openrisc_info_to_howto_rela | |
33 | PARAMS ((bfd *, arelent *, Elf32_Internal_Rela *)); | |
34 | static boolean openrisc_elf_relocate_section | |
35 | PARAMS ((bfd *, struct bfd_link_info *, bfd *, asection *, bfd_byte *, | |
36 | Elf_Internal_Rela *, Elf_Internal_Sym *, asection **)); | |
37 | static bfd_reloc_status_type openrisc_final_link_relocate | |
dc810e39 | 38 | PARAMS ((reloc_howto_type *, bfd *, asection *, bfd_byte *, |
b3baf5d0 NC |
39 | Elf_Internal_Rela *, bfd_vma)); |
40 | static boolean openrisc_elf_gc_sweep_hook | |
dc810e39 | 41 | PARAMS ((bfd *, struct bfd_link_info *, asection *, |
b3baf5d0 | 42 | const Elf_Internal_Rela *)); |
917583ad | 43 | static asection * openrisc_elf_gc_mark_hook |
b3baf5d0 NC |
44 | PARAMS ((bfd *, struct bfd_link_info *, Elf_Internal_Rela *, |
45 | struct elf_link_hash_entry *, Elf_Internal_Sym *)); | |
917583ad NC |
46 | static boolean openrisc_elf_check_relocs |
47 | PARAMS ((bfd *, struct bfd_link_info *, asection *, | |
48 | const Elf_Internal_Rela *)); | |
49 | static boolean openrisc_elf_object_p | |
50 | PARAMS ((bfd *)); | |
51 | static void openrisc_elf_final_write_processing | |
52 | PARAMS ((bfd *, boolean)); | |
b3baf5d0 NC |
53 | |
54 | ||
55 | static reloc_howto_type openrisc_elf_howto_table[] = | |
56 | { | |
57 | /* This reloc does nothing. */ | |
58 | HOWTO (R_OPENRISC_NONE, /* type */ | |
59 | 0, /* rightshift */ | |
60 | 2, /* size (0 = byte, 1 = short, 2 = long) */ | |
61 | 32, /* bitsize */ | |
62 | false, /* pc_relative */ | |
63 | 0, /* bitpos */ | |
64 | complain_overflow_bitfield, /* complain_on_overflow */ | |
65 | bfd_elf_generic_reloc, /* special_function */ | |
66 | "R_OPENRISC_NONE", /* name */ | |
67 | false, /* partial_inplace */ | |
68 | 0, /* src_mask */ | |
69 | 0, /* dst_mask */ | |
70 | false), /* pcrel_offset */ | |
71 | ||
72 | /* A PC relative 26 bit relocation, right shifted by 2. */ | |
73 | HOWTO (R_OPENRISC_INSN_REL_26, /* type */ | |
74 | 2, /* rightshift */ | |
75 | 2, /* size (0 = byte, 1 = short, 2 = long) */ | |
76 | 26, /* bitsize */ | |
77 | true, /* pc_relative */ | |
78 | 0, /* bitpos */ | |
79 | complain_overflow_signed, /* complain_on_overflow */ | |
80 | bfd_elf_generic_reloc, /* special_function */ | |
81 | "R_OPENRISC_INSN_REL_26", /* name */ | |
82 | false, /* partial_inplace */ | |
83 | 0x00000000, /* src_mask */ | |
84 | 0x03ffffff, /* dst_mask */ | |
85 | false), /* pcrel_offset */ | |
86 | ||
87 | /* A absolute 26 bit relocation, right shifted by 2. */ | |
88 | HOWTO (R_OPENRISC_INSN_ABS_26, /* type */ | |
89 | 2, /* rightshift */ | |
90 | 2, /* size (0 = byte, 1 = short, 2 = long) */ | |
91 | 26, /* bitsize */ | |
92 | false, /* pc_relative */ | |
93 | 0, /* bitpos */ | |
94 | complain_overflow_signed, /* complain_on_overflow */ | |
95 | bfd_elf_generic_reloc, /* special_function */ | |
96 | "R_OPENRISC_INSN_ABS_26", /* name */ | |
97 | false, /* partial_inplace */ | |
98 | 0x00000000, /* src_mask */ | |
99 | 0x03ffffff, /* dst_mask */ | |
100 | false), /* pcrel_offset */ | |
101 | ||
102 | HOWTO (R_OPENRISC_LO_16_IN_INSN, /* type */ | |
103 | 0, /* rightshift */ | |
c7e40348 | 104 | 1, /* size (0 = byte, 1 = short, 2 = long) */ |
b3baf5d0 NC |
105 | 16, /* bitsize */ |
106 | false, /* pc_relative */ | |
107 | 0, /* bitpos */ | |
c7e40348 | 108 | complain_overflow_dont, /* complain_on_overflow */ |
b3baf5d0 NC |
109 | bfd_elf_generic_reloc, /* special_function */ |
110 | "R_OPENRISC_LO_16_IN_INSN", /* name */ | |
111 | false, /* partial_inplace */ | |
c7e40348 | 112 | 0, /* src_mask */ |
b3baf5d0 NC |
113 | 0x0000ffff, /* dst_mask */ |
114 | false), /* pcrel_offset */ | |
115 | ||
116 | HOWTO (R_OPENRISC_HI_16_IN_INSN, /* type */ | |
117 | 16, /* rightshift */ | |
c7e40348 | 118 | 1, /* size (0 = byte, 1 = short, 2 = long) */ |
b3baf5d0 NC |
119 | 16, /* bitsize */ |
120 | false, /* pc_relative */ | |
121 | 0, /* bitpos */ | |
c7e40348 | 122 | complain_overflow_dont, /* complain_on_overflow */ |
b3baf5d0 NC |
123 | bfd_elf_generic_reloc, /* special_function */ |
124 | "R_OPENRISC_HI_16_IN_INSN", /* name */ | |
125 | false, /* partial_inplace */ | |
c7e40348 | 126 | 0, /* src_mask */ |
b3baf5d0 NC |
127 | 0x0000ffff, /* dst_mask */ |
128 | false), /* pcrel_offset */ | |
129 | ||
130 | /* An 8 bit absolute relocation. */ | |
131 | HOWTO (R_OPENRISC_8, /* type */ | |
132 | 0, /* rightshift */ | |
133 | 0, /* size (0 = byte, 1 = short, 2 = long) */ | |
134 | 8, /* bitsize */ | |
135 | false, /* pc_relative */ | |
136 | 0, /* bitpos */ | |
137 | complain_overflow_bitfield, /* complain_on_overflow */ | |
138 | bfd_elf_generic_reloc, /* special_function */ | |
139 | "R_OPENRISC_8", /* name */ | |
140 | true, /* partial_inplace */ | |
141 | 0x0000, /* src_mask */ | |
142 | 0x00ff, /* dst_mask */ | |
143 | false), /* pcrel_offset */ | |
144 | ||
145 | /* A 16 bit absolute relocation. */ | |
146 | HOWTO (R_OPENRISC_16, /* type */ | |
147 | 0, /* rightshift */ | |
148 | 1, /* size (0 = byte, 1 = short, 2 = long) */ | |
149 | 16, /* bitsize */ | |
150 | false, /* pc_relative */ | |
151 | 0, /* bitpos */ | |
152 | complain_overflow_bitfield, /* complain_on_overflow */ | |
153 | bfd_elf_generic_reloc, /* special_function */ | |
154 | "R_OPENRISC_16", /* name */ | |
155 | true, /* partial_inplace */ | |
156 | 0x00000000, /* src_mask */ | |
157 | 0x0000ffff, /* dst_mask */ | |
158 | false), /* pcrel_offset */ | |
159 | ||
160 | /* A 32 bit absolute relocation. */ | |
161 | HOWTO (R_OPENRISC_32, /* type */ | |
162 | 0, /* rightshift */ | |
163 | 2, /* size (0 = byte, 1 = short, 2 = long) */ | |
164 | 32, /* bitsize */ | |
165 | false, /* pc_relative */ | |
166 | 0, /* bitpos */ | |
167 | complain_overflow_bitfield, /* complain_on_overflow */ | |
168 | bfd_elf_generic_reloc, /* special_function */ | |
169 | "R_OPENRISC_32", /* name */ | |
170 | true, /* partial_inplace */ | |
171 | 0x00000000, /* src_mask */ | |
172 | 0xffffffff, /* dst_mask */ | |
173 | false), /* pcrel_offset */ | |
174 | ||
175 | /* GNU extension to record C++ vtable hierarchy */ | |
176 | HOWTO (R_OPENRISC_GNU_VTINHERIT, /* type */ | |
177 | 0, /* rightshift */ | |
178 | 2, /* size (0 = byte, 1 = short, 2 = long) */ | |
179 | 0, /* bitsize */ | |
180 | false, /* pc_relative */ | |
181 | 0, /* bitpos */ | |
182 | complain_overflow_dont, /* complain_on_overflow */ | |
183 | NULL, /* special_function */ | |
184 | "R_OPENRISC_GNU_VTINHERIT", /* name */ | |
185 | false, /* partial_inplace */ | |
186 | 0, /* src_mask */ | |
187 | 0, /* dst_mask */ | |
188 | false), /* pcrel_offset */ | |
189 | ||
190 | /* GNU extension to record C++ vtable member usage */ | |
191 | HOWTO (R_OPENRISC_GNU_VTENTRY, /* type */ | |
192 | 0, /* rightshift */ | |
193 | 2, /* size (0 = byte, 1 = short, 2 = long) */ | |
194 | 0, /* bitsize */ | |
195 | false, /* pc_relative */ | |
196 | 0, /* bitpos */ | |
197 | complain_overflow_dont, /* complain_on_overflow */ | |
198 | _bfd_elf_rel_vtable_reloc_fn, /* special_function */ | |
199 | "R_OPENRISC_GNU_VTENTRY", /* name */ | |
200 | false, /* partial_inplace */ | |
201 | 0, /* src_mask */ | |
202 | 0, /* dst_mask */ | |
203 | false), /* pcrel_offset */ | |
204 | }; | |
205 | ||
206 | /* Map BFD reloc types to OpenRISC ELF reloc types. */ | |
207 | ||
208 | struct openrisc_reloc_map | |
209 | { | |
210 | bfd_reloc_code_real_type bfd_reloc_val; | |
211 | unsigned int openrisc_reloc_val; | |
212 | }; | |
213 | ||
214 | static const struct openrisc_reloc_map openrisc_reloc_map[] = | |
215 | { | |
216 | { BFD_RELOC_NONE, R_OPENRISC_NONE }, | |
217 | { BFD_RELOC_32, R_OPENRISC_32 }, | |
218 | { BFD_RELOC_16, R_OPENRISC_16 }, | |
219 | { BFD_RELOC_8, R_OPENRISC_8 }, | |
220 | { BFD_RELOC_OPENRISC_REL_26,R_OPENRISC_INSN_REL_26 }, | |
221 | { BFD_RELOC_OPENRISC_ABS_26,R_OPENRISC_INSN_ABS_26 }, | |
222 | { BFD_RELOC_HI16, R_OPENRISC_HI_16_IN_INSN }, | |
223 | { BFD_RELOC_LO16, R_OPENRISC_LO_16_IN_INSN }, | |
224 | { BFD_RELOC_VTABLE_INHERIT, R_OPENRISC_GNU_VTINHERIT }, | |
225 | { BFD_RELOC_VTABLE_ENTRY, R_OPENRISC_GNU_VTENTRY } | |
226 | }; | |
227 | ||
228 | static reloc_howto_type * | |
229 | openrisc_reloc_type_lookup (abfd, code) | |
230 | bfd * abfd ATTRIBUTE_UNUSED; | |
231 | bfd_reloc_code_real_type code; | |
232 | { | |
233 | unsigned int i; | |
234 | ||
235 | for (i = ARRAY_SIZE (openrisc_reloc_map); --i;) | |
236 | if (openrisc_reloc_map[i].bfd_reloc_val == code) | |
237 | return & openrisc_elf_howto_table[openrisc_reloc_map[i]. | |
238 | openrisc_reloc_val]; | |
239 | ||
240 | return NULL; | |
241 | } | |
242 | ||
243 | /* Set the howto pointer for an OpenRISC ELF reloc. */ | |
244 | ||
245 | static void | |
246 | openrisc_info_to_howto_rela (abfd, cache_ptr, dst) | |
247 | bfd * abfd ATTRIBUTE_UNUSED; | |
248 | arelent * cache_ptr; | |
249 | Elf32_Internal_Rela * dst; | |
250 | { | |
251 | unsigned int r_type; | |
252 | ||
253 | r_type = ELF32_R_TYPE (dst->r_info); | |
254 | BFD_ASSERT (r_type < (unsigned int) R_OPENRISC_max); | |
255 | cache_ptr->howto = & openrisc_elf_howto_table[r_type]; | |
256 | } | |
257 | ||
258 | /* Perform a single relocation. By default we use the standard BFD | |
259 | routines, but a few relocs, we have to do them ourselves. */ | |
260 | ||
261 | static bfd_reloc_status_type | |
262 | openrisc_final_link_relocate (howto, input_bfd, input_section, contents, rel, | |
263 | relocation) | |
264 | reloc_howto_type *howto; | |
265 | bfd *input_bfd; | |
266 | asection *input_section; | |
267 | bfd_byte *contents; | |
268 | Elf_Internal_Rela *rel; | |
269 | bfd_vma relocation; | |
270 | { | |
271 | bfd_reloc_status_type r = bfd_reloc_ok; | |
272 | ||
273 | switch (howto->type) | |
274 | { | |
275 | case R_OPENRISC_LO_16_IN_INSN: | |
276 | relocation &= 0xffff; | |
277 | r = _bfd_final_link_relocate (howto, input_bfd, input_section, | |
278 | contents, rel->r_offset, | |
279 | relocation, rel->r_addend); | |
280 | break; | |
281 | ||
282 | default: | |
283 | r = _bfd_final_link_relocate (howto, input_bfd, input_section, | |
284 | contents, rel->r_offset, | |
285 | relocation, rel->r_addend); | |
286 | } | |
287 | ||
288 | return r; | |
289 | } | |
290 | ||
291 | /* Relocate an OpenRISC ELF section. | |
292 | There is some attempt to make this function usable for many architectures, | |
293 | both USE_REL and USE_RELA ['twould be nice if such a critter existed], | |
294 | if only to serve as a learning tool. | |
295 | ||
296 | The RELOCATE_SECTION function is called by the new ELF backend linker | |
297 | to handle the relocations for a section. | |
298 | ||
299 | The relocs are always passed as Rela structures; if the section | |
300 | actually uses Rel structures, the r_addend field will always be | |
301 | zero. | |
302 | ||
303 | This function is responsible for adjusting the section contents as | |
304 | necessary, and (if using Rela relocs and generating a relocateable | |
305 | output file) adjusting the reloc addend as necessary. | |
306 | ||
307 | This function does not have to worry about setting the reloc | |
308 | address or the reloc symbol index. | |
309 | ||
310 | LOCAL_SYMS is a pointer to the swapped in local symbols. | |
311 | ||
312 | LOCAL_SECTIONS is an array giving the section in the input file | |
313 | corresponding to the st_shndx field of each local symbol. | |
314 | ||
315 | The global hash table entry for the global symbols can be found | |
316 | via elf_sym_hashes (input_bfd). | |
317 | ||
318 | When generating relocateable output, this function must handle | |
319 | STB_LOCAL/STT_SECTION symbols specially. The output symbol is | |
320 | going to be the section symbol corresponding to the output | |
321 | section, which means that the addend must be adjusted | |
322 | accordingly. */ | |
323 | ||
324 | static boolean | |
325 | openrisc_elf_relocate_section (output_bfd, info, input_bfd, input_section, | |
326 | contents, relocs, local_syms, local_sections) | |
f8df10f4 | 327 | bfd *output_bfd; |
b3baf5d0 NC |
328 | struct bfd_link_info *info; |
329 | bfd *input_bfd; | |
330 | asection *input_section; | |
331 | bfd_byte *contents; | |
332 | Elf_Internal_Rela *relocs; | |
333 | Elf_Internal_Sym *local_syms; | |
334 | asection **local_sections; | |
335 | { | |
336 | Elf_Internal_Shdr *symtab_hdr; | |
337 | struct elf_link_hash_entry **sym_hashes; | |
338 | Elf_Internal_Rela *rel; | |
339 | Elf_Internal_Rela *relend; | |
340 | ||
341 | symtab_hdr = &elf_tdata (input_bfd)->symtab_hdr; | |
342 | sym_hashes = elf_sym_hashes (input_bfd); | |
343 | relend = relocs + input_section->reloc_count; | |
344 | ||
345 | for (rel = relocs; rel < relend; rel++) | |
346 | { | |
347 | reloc_howto_type *howto; | |
348 | unsigned long r_symndx; | |
349 | Elf_Internal_Sym *sym; | |
350 | asection *sec; | |
351 | struct elf_link_hash_entry *h; | |
352 | bfd_vma relocation; | |
353 | bfd_reloc_status_type r; | |
354 | const char *name = NULL; | |
355 | int r_type; | |
356 | ||
357 | r_type = ELF32_R_TYPE (rel->r_info); | |
358 | r_symndx = ELF32_R_SYM (rel->r_info); | |
359 | ||
360 | if (r_type == R_OPENRISC_GNU_VTINHERIT | |
361 | || r_type == R_OPENRISC_GNU_VTENTRY) | |
362 | continue; | |
363 | ||
364 | if (info->relocateable) | |
365 | { | |
366 | /* This is a relocateable link. We don't have to change | |
367 | anything, unless the reloc is against a section symbol, | |
368 | in which case we have to adjust according to where the | |
369 | section symbol winds up in the output section. */ | |
370 | if (r_symndx < symtab_hdr->sh_info) | |
371 | { | |
372 | sym = local_syms + r_symndx; | |
373 | ||
374 | if (ELF_ST_TYPE (sym->st_info) == STT_SECTION) | |
375 | { | |
376 | sec = local_sections[r_symndx]; | |
377 | rel->r_addend += sec->output_offset + sym->st_value; | |
378 | } | |
379 | } | |
380 | continue; | |
381 | } | |
382 | ||
383 | if ((unsigned int) r_type > | |
384 | (sizeof openrisc_elf_howto_table / sizeof (reloc_howto_type))) | |
385 | abort (); | |
386 | ||
387 | /* This is a final link. */ | |
388 | howto = openrisc_elf_howto_table + ELF32_R_TYPE (rel->r_info); | |
389 | h = NULL; | |
390 | sym = NULL; | |
391 | sec = NULL; | |
392 | ||
393 | if (r_symndx < symtab_hdr->sh_info) | |
394 | { | |
395 | sym = local_syms + r_symndx; | |
396 | sec = local_sections[r_symndx]; | |
f8df10f4 | 397 | relocation = _bfd_elf_rela_local_sym (output_bfd, sym, sec, rel); |
b3baf5d0 NC |
398 | |
399 | name = bfd_elf_string_from_elf_section | |
400 | (input_bfd, symtab_hdr->sh_link, sym->st_name); | |
401 | name = (name == NULL) ? bfd_section_name (input_bfd, sec) : name; | |
402 | } | |
403 | else | |
404 | { | |
405 | h = sym_hashes[r_symndx - symtab_hdr->sh_info]; | |
406 | ||
407 | while (h->root.type == bfd_link_hash_indirect | |
408 | || h->root.type == bfd_link_hash_warning) | |
409 | h = (struct elf_link_hash_entry *) h->root.u.i.link; | |
410 | ||
411 | name = h->root.root.string; | |
412 | ||
413 | if (h->root.type == bfd_link_hash_defined | |
414 | || h->root.type == bfd_link_hash_defweak) | |
415 | { | |
416 | sec = h->root.u.def.section; | |
417 | relocation = (h->root.u.def.value | |
418 | + sec->output_section->vma + sec->output_offset); | |
419 | } | |
420 | else if (h->root.type == bfd_link_hash_undefweak) | |
421 | { | |
422 | relocation = 0; | |
423 | } | |
424 | else | |
425 | { | |
426 | if (!((*info->callbacks->undefined_symbol) | |
427 | (info, h->root.root.string, input_bfd, | |
428 | input_section, rel->r_offset, true))) | |
429 | return false; | |
430 | relocation = 0; | |
431 | } | |
432 | } | |
433 | ||
434 | r = openrisc_final_link_relocate (howto, input_bfd, input_section, | |
435 | contents, rel, relocation); | |
436 | ||
437 | if (r != bfd_reloc_ok) | |
438 | { | |
439 | const char *msg = (const char *) NULL; | |
440 | ||
441 | switch (r) | |
442 | { | |
443 | case bfd_reloc_overflow: | |
444 | r = info->callbacks->reloc_overflow | |
445 | (info, name, howto->name, (bfd_vma) 0, | |
446 | input_bfd, input_section, rel->r_offset); | |
447 | break; | |
448 | ||
449 | case bfd_reloc_undefined: | |
450 | r = info->callbacks->undefined_symbol | |
451 | (info, name, input_bfd, input_section, rel->r_offset, true); | |
452 | break; | |
453 | ||
454 | case bfd_reloc_outofrange: | |
455 | msg = _("internal error: out of range error"); | |
456 | break; | |
457 | ||
458 | case bfd_reloc_notsupported: | |
459 | msg = _("internal error: unsupported relocation error"); | |
460 | break; | |
461 | ||
462 | case bfd_reloc_dangerous: | |
463 | msg = _("internal error: dangerous relocation"); | |
464 | break; | |
465 | ||
466 | default: | |
467 | msg = _("internal error: unknown error"); | |
468 | break; | |
469 | } | |
470 | ||
471 | if (msg) | |
472 | r = info->callbacks->warning | |
473 | (info, msg, name, input_bfd, input_section, rel->r_offset); | |
474 | ||
475 | if (!r) | |
476 | return false; | |
477 | } | |
478 | } | |
479 | ||
480 | return true; | |
481 | } | |
482 | ||
483 | /* Return the section that should be marked against GC for a given | |
484 | relocation. */ | |
485 | ||
486 | static asection * | |
487 | openrisc_elf_gc_mark_hook (abfd, info, rel, h, sym) | |
488 | bfd *abfd ATTRIBUTE_UNUSED; | |
489 | struct bfd_link_info *info ATTRIBUTE_UNUSED; | |
490 | Elf_Internal_Rela *rel ATTRIBUTE_UNUSED; | |
491 | struct elf_link_hash_entry *h ATTRIBUTE_UNUSED; | |
492 | Elf_Internal_Sym *sym ATTRIBUTE_UNUSED; | |
493 | { | |
494 | if (h != NULL) | |
495 | { | |
496 | switch (ELF32_R_TYPE (rel->r_info)) | |
497 | { | |
498 | case R_OPENRISC_GNU_VTINHERIT: | |
499 | case R_OPENRISC_GNU_VTENTRY: | |
500 | break; | |
501 | ||
502 | default: | |
503 | switch (h->root.type) | |
504 | { | |
505 | case bfd_link_hash_defined: | |
506 | case bfd_link_hash_defweak: | |
507 | return h->root.u.def.section; | |
508 | ||
509 | case bfd_link_hash_common: | |
510 | return h->root.u.c.p->section; | |
511 | ||
512 | default: | |
513 | break; | |
514 | } | |
515 | } | |
516 | } | |
517 | else | |
518 | { | |
9ad5cbcf | 519 | return bfd_section_from_elf_index (abfd, sym->st_shndx); |
b3baf5d0 NC |
520 | } |
521 | ||
522 | return NULL; | |
523 | } | |
524 | ||
525 | /* Update the got entry reference counts for the section being removed. */ | |
526 | ||
527 | static boolean | |
528 | openrisc_elf_gc_sweep_hook (abfd, info, sec, relocs) | |
529 | bfd *abfd ATTRIBUTE_UNUSED; | |
530 | struct bfd_link_info *info ATTRIBUTE_UNUSED; | |
531 | asection *sec ATTRIBUTE_UNUSED; | |
532 | const Elf_Internal_Rela *relocs ATTRIBUTE_UNUSED; | |
533 | { | |
534 | return true; | |
535 | } | |
536 | ||
537 | /* Look through the relocs for a section during the first phase. | |
538 | Since we don't do .gots or .plts, we just need to consider the | |
539 | virtual table relocs for gc. */ | |
540 | ||
541 | static boolean | |
542 | openrisc_elf_check_relocs (abfd, info, sec, relocs) | |
543 | bfd *abfd; | |
544 | struct bfd_link_info *info; | |
545 | asection *sec; | |
546 | const Elf_Internal_Rela *relocs; | |
547 | { | |
548 | Elf_Internal_Shdr *symtab_hdr; | |
549 | struct elf_link_hash_entry **sym_hashes, **sym_hashes_end; | |
550 | const Elf_Internal_Rela *rel; | |
551 | const Elf_Internal_Rela *rel_end; | |
552 | ||
553 | if (info->relocateable) | |
554 | return true; | |
555 | ||
556 | symtab_hdr = &elf_tdata (abfd)->symtab_hdr; | |
557 | sym_hashes = elf_sym_hashes (abfd); | |
558 | sym_hashes_end = | |
559 | sym_hashes + symtab_hdr->sh_size / sizeof (Elf32_External_Sym); | |
560 | if (!elf_bad_symtab (abfd)) | |
561 | sym_hashes_end -= symtab_hdr->sh_info; | |
562 | ||
563 | rel_end = relocs + sec->reloc_count; | |
564 | for (rel = relocs; rel < rel_end; rel++) | |
565 | { | |
566 | struct elf_link_hash_entry *h; | |
567 | unsigned long r_symndx; | |
568 | ||
569 | r_symndx = ELF32_R_SYM (rel->r_info); | |
570 | if (r_symndx < symtab_hdr->sh_info) | |
571 | h = NULL; | |
572 | else | |
573 | h = sym_hashes[r_symndx - symtab_hdr->sh_info]; | |
574 | ||
575 | switch (ELF32_R_TYPE (rel->r_info)) | |
576 | { | |
577 | /* This relocation describes the C++ object vtable hierarchy. | |
578 | Reconstruct it for later use during GC. */ | |
579 | case R_OPENRISC_GNU_VTINHERIT: | |
580 | if (!_bfd_elf32_gc_record_vtinherit (abfd, sec, h, rel->r_offset)) | |
581 | return false; | |
582 | break; | |
583 | ||
584 | /* This relocation describes which C++ vtable entries are actually | |
585 | used. Record for later use during GC. */ | |
586 | case R_OPENRISC_GNU_VTENTRY: | |
587 | if (!_bfd_elf32_gc_record_vtentry (abfd, sec, h, rel->r_addend)) | |
588 | return false; | |
589 | break; | |
590 | } | |
591 | } | |
592 | ||
593 | return true; | |
594 | } | |
595 | ||
596 | /* Set the right machine number. */ | |
597 | ||
598 | static boolean | |
599 | openrisc_elf_object_p (abfd) | |
600 | bfd *abfd; | |
601 | { | |
602 | switch (elf_elfheader (abfd)->e_flags & 0xf) | |
603 | { | |
604 | default: | |
605 | (void) bfd_default_set_arch_mach (abfd, bfd_arch_openrisc, 0); | |
606 | break; | |
607 | } | |
608 | return true; | |
609 | } | |
610 | ||
611 | /* Store the machine number in the flags field. */ | |
612 | ||
613 | static void | |
614 | openrisc_elf_final_write_processing (abfd, linker) | |
615 | bfd *abfd; | |
616 | boolean linker ATTRIBUTE_UNUSED; | |
617 | { | |
618 | unsigned long val; | |
619 | ||
620 | switch (bfd_get_mach (abfd)) | |
621 | { | |
622 | default: | |
623 | val = 0; | |
624 | break; | |
625 | } | |
626 | ||
627 | elf_elfheader (abfd)->e_flags &= ~0xf; | |
628 | elf_elfheader (abfd)->e_flags |= val; | |
629 | } | |
630 | ||
631 | ||
632 | #define ELF_ARCH bfd_arch_openrisc | |
633 | #define ELF_MACHINE_CODE EM_OPENRISC | |
c11cc227 | 634 | #define ELF_MACHINE_ALT1 EM_OPENRISC_OLD |
b3baf5d0 NC |
635 | #define ELF_MAXPAGESIZE 0x1000 |
636 | ||
637 | #define TARGET_BIG_SYM bfd_elf32_openrisc_vec | |
638 | #define TARGET_BIG_NAME "elf32-openrisc" | |
639 | ||
640 | #define elf_info_to_howto_rel NULL | |
641 | #define elf_info_to_howto openrisc_info_to_howto_rela | |
642 | #define elf_backend_relocate_section openrisc_elf_relocate_section | |
643 | #define elf_backend_gc_mark_hook openrisc_elf_gc_mark_hook | |
644 | #define elf_backend_gc_sweep_hook openrisc_elf_gc_sweep_hook | |
645 | #define elf_backend_check_relocs openrisc_elf_check_relocs | |
646 | ||
647 | #define elf_backend_can_gc_sections 1 | |
648 | ||
649 | #define bfd_elf32_bfd_reloc_type_lookup openrisc_reloc_type_lookup | |
650 | ||
651 | #define elf_backend_object_p openrisc_elf_object_p | |
652 | #define elf_backend_final_write_processing openrisc_elf_final_write_processing | |
653 | ||
654 | #include "elf32-target.h" |