Commit | Line | Data |
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b3baf5d0 | 1 | /* OpenRISC-specific support for 32-bit ELF. |
1049f94e | 2 | Copyright 2001, 2002, 2003 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 | |
947216bf | 33 | PARAMS ((bfd *, arelent *, Elf_Internal_Rela *)); |
b34976b6 | 34 | static bfd_boolean openrisc_elf_relocate_section |
b3baf5d0 NC |
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 | 39 | Elf_Internal_Rela *, bfd_vma)); |
b34976b6 | 40 | static bfd_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 |
1e2f5b6e | 44 | PARAMS ((asection *, struct bfd_link_info *, Elf_Internal_Rela *, |
b3baf5d0 | 45 | struct elf_link_hash_entry *, Elf_Internal_Sym *)); |
b34976b6 | 46 | static bfd_boolean openrisc_elf_check_relocs |
917583ad NC |
47 | PARAMS ((bfd *, struct bfd_link_info *, asection *, |
48 | const Elf_Internal_Rela *)); | |
b34976b6 | 49 | static bfd_boolean openrisc_elf_object_p |
917583ad NC |
50 | PARAMS ((bfd *)); |
51 | static void openrisc_elf_final_write_processing | |
b34976b6 | 52 | PARAMS ((bfd *, 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 */ | |
b34976b6 | 62 | FALSE, /* pc_relative */ |
b3baf5d0 NC |
63 | 0, /* bitpos */ |
64 | complain_overflow_bitfield, /* complain_on_overflow */ | |
65 | bfd_elf_generic_reloc, /* special_function */ | |
66 | "R_OPENRISC_NONE", /* name */ | |
b34976b6 | 67 | FALSE, /* partial_inplace */ |
b3baf5d0 NC |
68 | 0, /* src_mask */ |
69 | 0, /* dst_mask */ | |
b34976b6 | 70 | FALSE), /* pcrel_offset */ |
b3baf5d0 NC |
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 */ | |
b34976b6 | 77 | TRUE, /* pc_relative */ |
b3baf5d0 NC |
78 | 0, /* bitpos */ |
79 | complain_overflow_signed, /* complain_on_overflow */ | |
80 | bfd_elf_generic_reloc, /* special_function */ | |
81 | "R_OPENRISC_INSN_REL_26", /* name */ | |
b34976b6 | 82 | FALSE, /* partial_inplace */ |
b3baf5d0 NC |
83 | 0x00000000, /* src_mask */ |
84 | 0x03ffffff, /* dst_mask */ | |
b34976b6 | 85 | FALSE), /* pcrel_offset */ |
b3baf5d0 NC |
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 */ | |
b34976b6 | 92 | FALSE, /* pc_relative */ |
b3baf5d0 NC |
93 | 0, /* bitpos */ |
94 | complain_overflow_signed, /* complain_on_overflow */ | |
95 | bfd_elf_generic_reloc, /* special_function */ | |
96 | "R_OPENRISC_INSN_ABS_26", /* name */ | |
b34976b6 | 97 | FALSE, /* partial_inplace */ |
b3baf5d0 NC |
98 | 0x00000000, /* src_mask */ |
99 | 0x03ffffff, /* dst_mask */ | |
b34976b6 | 100 | FALSE), /* pcrel_offset */ |
b3baf5d0 NC |
101 | |
102 | HOWTO (R_OPENRISC_LO_16_IN_INSN, /* type */ | |
103 | 0, /* rightshift */ | |
c7e40348 | 104 | 1, /* size (0 = byte, 1 = short, 2 = long) */ |
b3baf5d0 | 105 | 16, /* bitsize */ |
b34976b6 | 106 | FALSE, /* pc_relative */ |
b3baf5d0 | 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 */ | |
b34976b6 | 111 | FALSE, /* partial_inplace */ |
c7e40348 | 112 | 0, /* src_mask */ |
b3baf5d0 | 113 | 0x0000ffff, /* dst_mask */ |
b34976b6 | 114 | FALSE), /* pcrel_offset */ |
b3baf5d0 NC |
115 | |
116 | HOWTO (R_OPENRISC_HI_16_IN_INSN, /* type */ | |
117 | 16, /* rightshift */ | |
c7e40348 | 118 | 1, /* size (0 = byte, 1 = short, 2 = long) */ |
b3baf5d0 | 119 | 16, /* bitsize */ |
b34976b6 | 120 | FALSE, /* pc_relative */ |
b3baf5d0 | 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 */ | |
b34976b6 | 125 | FALSE, /* partial_inplace */ |
c7e40348 | 126 | 0, /* src_mask */ |
b3baf5d0 | 127 | 0x0000ffff, /* dst_mask */ |
b34976b6 | 128 | FALSE), /* pcrel_offset */ |
b3baf5d0 NC |
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 */ | |
b34976b6 | 135 | FALSE, /* pc_relative */ |
b3baf5d0 NC |
136 | 0, /* bitpos */ |
137 | complain_overflow_bitfield, /* complain_on_overflow */ | |
138 | bfd_elf_generic_reloc, /* special_function */ | |
139 | "R_OPENRISC_8", /* name */ | |
b34976b6 | 140 | TRUE, /* partial_inplace */ |
b3baf5d0 NC |
141 | 0x0000, /* src_mask */ |
142 | 0x00ff, /* dst_mask */ | |
b34976b6 | 143 | FALSE), /* pcrel_offset */ |
b3baf5d0 NC |
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 */ | |
b34976b6 | 150 | FALSE, /* pc_relative */ |
b3baf5d0 NC |
151 | 0, /* bitpos */ |
152 | complain_overflow_bitfield, /* complain_on_overflow */ | |
153 | bfd_elf_generic_reloc, /* special_function */ | |
154 | "R_OPENRISC_16", /* name */ | |
b34976b6 | 155 | TRUE, /* partial_inplace */ |
b3baf5d0 NC |
156 | 0x00000000, /* src_mask */ |
157 | 0x0000ffff, /* dst_mask */ | |
b34976b6 | 158 | FALSE), /* pcrel_offset */ |
b3baf5d0 NC |
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 */ | |
b34976b6 | 165 | FALSE, /* pc_relative */ |
b3baf5d0 NC |
166 | 0, /* bitpos */ |
167 | complain_overflow_bitfield, /* complain_on_overflow */ | |
168 | bfd_elf_generic_reloc, /* special_function */ | |
169 | "R_OPENRISC_32", /* name */ | |
b34976b6 | 170 | TRUE, /* partial_inplace */ |
b3baf5d0 NC |
171 | 0x00000000, /* src_mask */ |
172 | 0xffffffff, /* dst_mask */ | |
b34976b6 | 173 | FALSE), /* pcrel_offset */ |
b3baf5d0 NC |
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 */ | |
b34976b6 | 180 | FALSE, /* pc_relative */ |
b3baf5d0 NC |
181 | 0, /* bitpos */ |
182 | complain_overflow_dont, /* complain_on_overflow */ | |
183 | NULL, /* special_function */ | |
184 | "R_OPENRISC_GNU_VTINHERIT", /* name */ | |
b34976b6 | 185 | FALSE, /* partial_inplace */ |
b3baf5d0 NC |
186 | 0, /* src_mask */ |
187 | 0, /* dst_mask */ | |
b34976b6 | 188 | FALSE), /* pcrel_offset */ |
b3baf5d0 NC |
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 */ | |
b34976b6 | 195 | FALSE, /* pc_relative */ |
b3baf5d0 NC |
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 */ | |
b34976b6 | 200 | FALSE, /* partial_inplace */ |
b3baf5d0 NC |
201 | 0, /* src_mask */ |
202 | 0, /* dst_mask */ | |
b34976b6 | 203 | FALSE), /* pcrel_offset */ |
b3baf5d0 NC |
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; | |
947216bf | 249 | Elf_Internal_Rela * dst; |
b3baf5d0 NC |
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. | |
b3baf5d0 NC |
292 | |
293 | The RELOCATE_SECTION function is called by the new ELF backend linker | |
294 | to handle the relocations for a section. | |
295 | ||
296 | The relocs are always passed as Rela structures; if the section | |
297 | actually uses Rel structures, the r_addend field will always be | |
298 | zero. | |
299 | ||
300 | This function is responsible for adjusting the section contents as | |
1049f94e | 301 | necessary, and (if using Rela relocs and generating a relocatable |
b3baf5d0 NC |
302 | output file) adjusting the reloc addend as necessary. |
303 | ||
304 | This function does not have to worry about setting the reloc | |
305 | address or the reloc symbol index. | |
306 | ||
307 | LOCAL_SYMS is a pointer to the swapped in local symbols. | |
308 | ||
309 | LOCAL_SECTIONS is an array giving the section in the input file | |
310 | corresponding to the st_shndx field of each local symbol. | |
311 | ||
312 | The global hash table entry for the global symbols can be found | |
313 | via elf_sym_hashes (input_bfd). | |
314 | ||
1049f94e | 315 | When generating relocatable output, this function must handle |
b3baf5d0 NC |
316 | STB_LOCAL/STT_SECTION symbols specially. The output symbol is |
317 | going to be the section symbol corresponding to the output | |
318 | section, which means that the addend must be adjusted | |
319 | accordingly. */ | |
320 | ||
b34976b6 | 321 | static bfd_boolean |
b3baf5d0 NC |
322 | openrisc_elf_relocate_section (output_bfd, info, input_bfd, input_section, |
323 | contents, relocs, local_syms, local_sections) | |
f8df10f4 | 324 | bfd *output_bfd; |
b3baf5d0 NC |
325 | struct bfd_link_info *info; |
326 | bfd *input_bfd; | |
327 | asection *input_section; | |
328 | bfd_byte *contents; | |
329 | Elf_Internal_Rela *relocs; | |
330 | Elf_Internal_Sym *local_syms; | |
331 | asection **local_sections; | |
332 | { | |
333 | Elf_Internal_Shdr *symtab_hdr; | |
334 | struct elf_link_hash_entry **sym_hashes; | |
335 | Elf_Internal_Rela *rel; | |
336 | Elf_Internal_Rela *relend; | |
337 | ||
1049f94e | 338 | if (info->relocatable) |
b34976b6 | 339 | return TRUE; |
b491616a | 340 | |
b3baf5d0 NC |
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 | ||
b3baf5d0 NC |
364 | if ((unsigned int) r_type > |
365 | (sizeof openrisc_elf_howto_table / sizeof (reloc_howto_type))) | |
366 | abort (); | |
367 | ||
368 | /* This is a final link. */ | |
369 | howto = openrisc_elf_howto_table + ELF32_R_TYPE (rel->r_info); | |
370 | h = NULL; | |
371 | sym = NULL; | |
372 | sec = NULL; | |
373 | ||
374 | if (r_symndx < symtab_hdr->sh_info) | |
375 | { | |
376 | sym = local_syms + r_symndx; | |
377 | sec = local_sections[r_symndx]; | |
f8df10f4 | 378 | relocation = _bfd_elf_rela_local_sym (output_bfd, sym, sec, rel); |
b3baf5d0 NC |
379 | |
380 | name = bfd_elf_string_from_elf_section | |
381 | (input_bfd, symtab_hdr->sh_link, sym->st_name); | |
382 | name = (name == NULL) ? bfd_section_name (input_bfd, sec) : name; | |
383 | } | |
384 | else | |
385 | { | |
386 | h = sym_hashes[r_symndx - symtab_hdr->sh_info]; | |
387 | ||
388 | while (h->root.type == bfd_link_hash_indirect | |
389 | || h->root.type == bfd_link_hash_warning) | |
390 | h = (struct elf_link_hash_entry *) h->root.u.i.link; | |
391 | ||
392 | name = h->root.root.string; | |
393 | ||
394 | if (h->root.type == bfd_link_hash_defined | |
395 | || h->root.type == bfd_link_hash_defweak) | |
396 | { | |
397 | sec = h->root.u.def.section; | |
398 | relocation = (h->root.u.def.value | |
399 | + sec->output_section->vma + sec->output_offset); | |
400 | } | |
401 | else if (h->root.type == bfd_link_hash_undefweak) | |
402 | { | |
403 | relocation = 0; | |
404 | } | |
405 | else | |
406 | { | |
407 | if (!((*info->callbacks->undefined_symbol) | |
408 | (info, h->root.root.string, input_bfd, | |
b34976b6 AM |
409 | input_section, rel->r_offset, TRUE))) |
410 | return FALSE; | |
b3baf5d0 NC |
411 | relocation = 0; |
412 | } | |
413 | } | |
414 | ||
415 | r = openrisc_final_link_relocate (howto, input_bfd, input_section, | |
416 | contents, rel, relocation); | |
417 | ||
418 | if (r != bfd_reloc_ok) | |
419 | { | |
420 | const char *msg = (const char *) NULL; | |
421 | ||
422 | switch (r) | |
423 | { | |
424 | case bfd_reloc_overflow: | |
425 | r = info->callbacks->reloc_overflow | |
426 | (info, name, howto->name, (bfd_vma) 0, | |
427 | input_bfd, input_section, rel->r_offset); | |
428 | break; | |
429 | ||
430 | case bfd_reloc_undefined: | |
431 | r = info->callbacks->undefined_symbol | |
b34976b6 | 432 | (info, name, input_bfd, input_section, rel->r_offset, TRUE); |
b3baf5d0 NC |
433 | break; |
434 | ||
435 | case bfd_reloc_outofrange: | |
436 | msg = _("internal error: out of range error"); | |
437 | break; | |
438 | ||
439 | case bfd_reloc_notsupported: | |
440 | msg = _("internal error: unsupported relocation error"); | |
441 | break; | |
442 | ||
443 | case bfd_reloc_dangerous: | |
444 | msg = _("internal error: dangerous relocation"); | |
445 | break; | |
446 | ||
447 | default: | |
448 | msg = _("internal error: unknown error"); | |
449 | break; | |
450 | } | |
451 | ||
452 | if (msg) | |
453 | r = info->callbacks->warning | |
454 | (info, msg, name, input_bfd, input_section, rel->r_offset); | |
455 | ||
456 | if (!r) | |
b34976b6 | 457 | return FALSE; |
b3baf5d0 NC |
458 | } |
459 | } | |
460 | ||
b34976b6 | 461 | return TRUE; |
b3baf5d0 NC |
462 | } |
463 | ||
464 | /* Return the section that should be marked against GC for a given | |
465 | relocation. */ | |
466 | ||
467 | static asection * | |
1e2f5b6e AM |
468 | openrisc_elf_gc_mark_hook (sec, info, rel, h, sym) |
469 | asection *sec; | |
b3baf5d0 | 470 | struct bfd_link_info *info ATTRIBUTE_UNUSED; |
8d2c33be AM |
471 | Elf_Internal_Rela *rel; |
472 | struct elf_link_hash_entry *h; | |
473 | Elf_Internal_Sym *sym; | |
b3baf5d0 NC |
474 | { |
475 | if (h != NULL) | |
476 | { | |
477 | switch (ELF32_R_TYPE (rel->r_info)) | |
478 | { | |
479 | case R_OPENRISC_GNU_VTINHERIT: | |
480 | case R_OPENRISC_GNU_VTENTRY: | |
481 | break; | |
482 | ||
483 | default: | |
484 | switch (h->root.type) | |
485 | { | |
486 | case bfd_link_hash_defined: | |
487 | case bfd_link_hash_defweak: | |
488 | return h->root.u.def.section; | |
489 | ||
490 | case bfd_link_hash_common: | |
491 | return h->root.u.c.p->section; | |
492 | ||
493 | default: | |
494 | break; | |
495 | } | |
496 | } | |
497 | } | |
498 | else | |
1e2f5b6e | 499 | return bfd_section_from_elf_index (sec->owner, sym->st_shndx); |
b3baf5d0 NC |
500 | |
501 | return NULL; | |
502 | } | |
503 | ||
504 | /* Update the got entry reference counts for the section being removed. */ | |
505 | ||
b34976b6 | 506 | static bfd_boolean |
b3baf5d0 NC |
507 | openrisc_elf_gc_sweep_hook (abfd, info, sec, relocs) |
508 | bfd *abfd ATTRIBUTE_UNUSED; | |
509 | struct bfd_link_info *info ATTRIBUTE_UNUSED; | |
510 | asection *sec ATTRIBUTE_UNUSED; | |
511 | const Elf_Internal_Rela *relocs ATTRIBUTE_UNUSED; | |
512 | { | |
b34976b6 | 513 | return TRUE; |
b3baf5d0 NC |
514 | } |
515 | ||
516 | /* Look through the relocs for a section during the first phase. | |
517 | Since we don't do .gots or .plts, we just need to consider the | |
518 | virtual table relocs for gc. */ | |
519 | ||
b34976b6 | 520 | static bfd_boolean |
b3baf5d0 NC |
521 | openrisc_elf_check_relocs (abfd, info, sec, relocs) |
522 | bfd *abfd; | |
523 | struct bfd_link_info *info; | |
524 | asection *sec; | |
525 | const Elf_Internal_Rela *relocs; | |
526 | { | |
527 | Elf_Internal_Shdr *symtab_hdr; | |
528 | struct elf_link_hash_entry **sym_hashes, **sym_hashes_end; | |
529 | const Elf_Internal_Rela *rel; | |
530 | const Elf_Internal_Rela *rel_end; | |
531 | ||
1049f94e | 532 | if (info->relocatable) |
b34976b6 | 533 | return TRUE; |
b3baf5d0 NC |
534 | |
535 | symtab_hdr = &elf_tdata (abfd)->symtab_hdr; | |
536 | sym_hashes = elf_sym_hashes (abfd); | |
537 | sym_hashes_end = | |
538 | sym_hashes + symtab_hdr->sh_size / sizeof (Elf32_External_Sym); | |
539 | if (!elf_bad_symtab (abfd)) | |
540 | sym_hashes_end -= symtab_hdr->sh_info; | |
541 | ||
542 | rel_end = relocs + sec->reloc_count; | |
543 | for (rel = relocs; rel < rel_end; rel++) | |
544 | { | |
545 | struct elf_link_hash_entry *h; | |
546 | unsigned long r_symndx; | |
547 | ||
548 | r_symndx = ELF32_R_SYM (rel->r_info); | |
549 | if (r_symndx < symtab_hdr->sh_info) | |
550 | h = NULL; | |
551 | else | |
552 | h = sym_hashes[r_symndx - symtab_hdr->sh_info]; | |
553 | ||
554 | switch (ELF32_R_TYPE (rel->r_info)) | |
555 | { | |
556 | /* This relocation describes the C++ object vtable hierarchy. | |
557 | Reconstruct it for later use during GC. */ | |
558 | case R_OPENRISC_GNU_VTINHERIT: | |
559 | if (!_bfd_elf32_gc_record_vtinherit (abfd, sec, h, rel->r_offset)) | |
b34976b6 | 560 | return FALSE; |
b3baf5d0 NC |
561 | break; |
562 | ||
563 | /* This relocation describes which C++ vtable entries are actually | |
564 | used. Record for later use during GC. */ | |
565 | case R_OPENRISC_GNU_VTENTRY: | |
566 | if (!_bfd_elf32_gc_record_vtentry (abfd, sec, h, rel->r_addend)) | |
b34976b6 | 567 | return FALSE; |
b3baf5d0 NC |
568 | break; |
569 | } | |
570 | } | |
571 | ||
b34976b6 | 572 | return TRUE; |
b3baf5d0 NC |
573 | } |
574 | ||
575 | /* Set the right machine number. */ | |
576 | ||
b34976b6 | 577 | static bfd_boolean |
b3baf5d0 NC |
578 | openrisc_elf_object_p (abfd) |
579 | bfd *abfd; | |
580 | { | |
581 | switch (elf_elfheader (abfd)->e_flags & 0xf) | |
582 | { | |
583 | default: | |
584 | (void) bfd_default_set_arch_mach (abfd, bfd_arch_openrisc, 0); | |
585 | break; | |
586 | } | |
b34976b6 | 587 | return TRUE; |
b3baf5d0 NC |
588 | } |
589 | ||
590 | /* Store the machine number in the flags field. */ | |
591 | ||
592 | static void | |
593 | openrisc_elf_final_write_processing (abfd, linker) | |
594 | bfd *abfd; | |
b34976b6 | 595 | bfd_boolean linker ATTRIBUTE_UNUSED; |
b3baf5d0 NC |
596 | { |
597 | unsigned long val; | |
598 | ||
599 | switch (bfd_get_mach (abfd)) | |
600 | { | |
601 | default: | |
602 | val = 0; | |
603 | break; | |
604 | } | |
605 | ||
606 | elf_elfheader (abfd)->e_flags &= ~0xf; | |
607 | elf_elfheader (abfd)->e_flags |= val; | |
608 | } | |
609 | ||
610 | ||
611 | #define ELF_ARCH bfd_arch_openrisc | |
612 | #define ELF_MACHINE_CODE EM_OPENRISC | |
c11cc227 | 613 | #define ELF_MACHINE_ALT1 EM_OPENRISC_OLD |
b3baf5d0 NC |
614 | #define ELF_MAXPAGESIZE 0x1000 |
615 | ||
616 | #define TARGET_BIG_SYM bfd_elf32_openrisc_vec | |
617 | #define TARGET_BIG_NAME "elf32-openrisc" | |
618 | ||
619 | #define elf_info_to_howto_rel NULL | |
620 | #define elf_info_to_howto openrisc_info_to_howto_rela | |
621 | #define elf_backend_relocate_section openrisc_elf_relocate_section | |
622 | #define elf_backend_gc_mark_hook openrisc_elf_gc_mark_hook | |
623 | #define elf_backend_gc_sweep_hook openrisc_elf_gc_sweep_hook | |
624 | #define elf_backend_check_relocs openrisc_elf_check_relocs | |
625 | ||
626 | #define elf_backend_can_gc_sections 1 | |
b491616a | 627 | #define elf_backend_rela_normal 1 |
b3baf5d0 NC |
628 | |
629 | #define bfd_elf32_bfd_reloc_type_lookup openrisc_reloc_type_lookup | |
630 | ||
631 | #define elf_backend_object_p openrisc_elf_object_p | |
632 | #define elf_backend_final_write_processing openrisc_elf_final_write_processing | |
633 | ||
634 | #include "elf32-target.h" |