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4aeed4f2 NC |
1 | /* FR30-specific support for 32-bit ELF. |
2 | Copyright (C) 1998 Free Software Foundation, Inc. | |
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 | #include "bfd.h" | |
21 | #include "sysdep.h" | |
22 | #include "libbfd.h" | |
23 | #include "elf-bfd.h" | |
24 | #include "elf/fr30.h" | |
25 | ||
26 | /* Forward declarations. */ | |
27 | static bfd_reloc_status_type fr30_elf_i20_reloc | |
28 | PARAMS ((bfd *, arelent *, asymbol *, PTR, asection *, bfd *, char **)); | |
29 | ||
30 | static reloc_howto_type fr30_elf_howto_table [] = | |
31 | { | |
32 | /* This reloc does nothing. */ | |
33 | HOWTO (R_FR30_NONE, /* type */ | |
34 | 0, /* rightshift */ | |
35 | 2, /* size (0 = byte, 1 = short, 2 = long) */ | |
36 | 32, /* bitsize */ | |
37 | false, /* pc_relative */ | |
38 | 0, /* bitpos */ | |
39 | complain_overflow_bitfield, /* complain_on_overflow */ | |
40 | bfd_elf_generic_reloc, /* special_function */ | |
41 | "R_FR30_NONE", /* name */ | |
42 | false, /* partial_inplace */ | |
43 | 0, /* src_mask */ | |
44 | 0, /* dst_mask */ | |
45 | false), /* pcrel_offset */ | |
46 | ||
47 | /* An 8 bit absolute relocation. */ | |
48 | HOWTO (R_FR30_8, /* type */ | |
49 | 0, /* rightshift */ | |
50 | 1, /* size (0 = byte, 1 = short, 2 = long) */ | |
51 | 8, /* bitsize */ | |
52 | false, /* pc_relative */ | |
53 | 4, /* bitpos */ | |
54 | complain_overflow_bitfield, /* complain_on_overflow */ | |
55 | bfd_elf_generic_reloc, /* special_function */ | |
56 | "R_FR30_8", /* name */ | |
57 | true, /* partial_inplace */ | |
58 | 0x0ff0, /* src_mask */ | |
59 | 0x0ff0, /* dst_mask */ | |
60 | false), /* pcrel_offset */ | |
61 | ||
62 | /* A 20 bit absolute relocation. */ | |
63 | HOWTO (R_FR30_20, /* type */ | |
64 | 0, /* rightshift */ | |
65 | 2, /* size (0 = byte, 1 = short, 2 = long) */ | |
66 | 20, /* bitsize */ | |
67 | false, /* pc_relative */ | |
68 | 0, /* bitpos */ | |
69 | complain_overflow_bitfield, /* complain_on_overflow */ | |
70 | fr30_elf_i20_reloc, /* special_function */ | |
71 | "R_FR30_20", /* name */ | |
72 | true, /* partial_inplace */ | |
73 | 0x00f0ffff, /* src_mask */ | |
74 | 0x00f0ffff, /* dst_mask */ | |
75 | false), /* pcrel_offset */ | |
76 | ||
77 | /* A 32 bit absolute relocation. */ | |
78 | HOWTO (R_FR30_32, /* type */ | |
79 | 0, /* rightshift */ | |
80 | 2, /* size (0 = byte, 1 = short, 2 = long) */ | |
81 | 32, /* bitsize */ | |
82 | false, /* pc_relative */ | |
83 | 0, /* bitpos */ | |
84 | complain_overflow_bitfield, /* complain_on_overflow */ | |
85 | bfd_elf_generic_reloc, /* special_function */ | |
86 | "R_FR30_32", /* name */ | |
87 | true, /* partial_inplace */ | |
88 | 0xffffffff, /* src_mask */ | |
89 | 0xffffffff, /* dst_mask */ | |
90 | false), /* pcrel_offset */ | |
91 | ||
92 | /* A 6 bit absolute relocation. */ | |
93 | HOWTO (R_FR30_6_IN_4, /* type */ | |
94 | 2, /* rightshift */ | |
95 | 1, /* size (0 = byte, 1 = short, 2 = long) */ | |
96 | 6, /* bitsize */ | |
97 | false, /* pc_relative */ | |
98 | 4, /* bitpos */ | |
99 | complain_overflow_unsigned, /* complain_on_overflow */ | |
100 | bfd_elf_generic_reloc, /* special_function */ | |
101 | "R_FR30_6_IN_4", /* name */ | |
102 | true, /* partial_inplace */ | |
103 | 0x00f0, /* src_mask */ | |
104 | 0x00f0, /* dst_mask */ | |
105 | false), /* pcrel_offset */ | |
106 | ||
107 | /* An 8 bit absolute relocation. */ | |
108 | HOWTO (R_FR30_8_IN_8, /* type */ | |
109 | 0, /* rightshift */ | |
110 | 1, /* size (0 = byte, 1 = short, 2 = long) */ | |
111 | 8, /* bitsize */ | |
112 | false, /* pc_relative */ | |
113 | 4, /* bitpos */ | |
114 | complain_overflow_signed, /* complain_on_overflow */ | |
115 | bfd_elf_generic_reloc,/* special_function */ | |
116 | "R_FR30_8_IN_8", /* name */ | |
117 | true, /* partial_inplace */ | |
118 | 0x0ff0, /* src_mask */ | |
119 | 0x0ff0, /* dst_mask */ | |
120 | false), /* pcrel_offset */ | |
121 | ||
122 | /* A 9 bit absolute relocation. */ | |
123 | HOWTO (R_FR30_9_IN_8, /* type */ | |
124 | 1, /* rightshift */ | |
125 | 1, /* size (0 = byte, 1 = short, 2 = long) */ | |
126 | 9, /* bitsize */ | |
127 | false, /* pc_relative */ | |
128 | 4, /* bitpos */ | |
129 | complain_overflow_signed, /* complain_on_overflow */ | |
130 | bfd_elf_generic_reloc,/* special_function */ | |
131 | "R_FR30_9_IN_8", /* name */ | |
132 | true, /* partial_inplace */ | |
133 | 0x0ff0, /* src_mask */ | |
134 | 0x0ff0, /* dst_mask */ | |
135 | false), /* pcrel_offset */ | |
136 | ||
137 | /* A 10 bit absolute relocation. */ | |
138 | HOWTO (R_FR30_10_IN_8, /* type */ | |
139 | 2, /* rightshift */ | |
140 | 1, /* size (0 = byte, 1 = short, 2 = long) */ | |
141 | 10, /* bitsize */ | |
142 | false, /* pc_relative */ | |
143 | 4, /* bitpos */ | |
144 | complain_overflow_signed, /* complain_on_overflow */ | |
145 | bfd_elf_generic_reloc,/* special_function */ | |
146 | "R_FR30_10_IN_8", /* name */ | |
147 | true, /* partial_inplace */ | |
148 | 0x0ff0, /* src_mask */ | |
149 | 0x0ff0, /* dst_mask */ | |
150 | false), /* pcrel_offset */ | |
151 | ||
152 | /* A PC relative 9 bit relocation, right shifted by 1. */ | |
153 | HOWTO (R_FR30_9_PCREL, /* type */ | |
154 | 1, /* rightshift */ | |
155 | 1, /* size (0 = byte, 1 = short, 2 = long) */ | |
156 | 9, /* bitsize */ | |
157 | true, /* pc_relative */ | |
158 | 0, /* bitpos */ | |
159 | complain_overflow_signed, /* complain_on_overflow */ | |
160 | bfd_elf_generic_reloc, /* special_function */ | |
161 | "R_FR30_9_PCREL", /* name */ | |
162 | false, /* partial_inplace */ | |
163 | 0x00ff, /* src_mask */ | |
164 | 0x00ff, /* dst_mask */ | |
165 | true), /* pcrel_offset */ | |
166 | ||
167 | /* A PC relative 12 bit relocation, right shifted by 1. */ | |
168 | HOWTO (R_FR30_12_PCREL, /* type */ | |
169 | 1, /* rightshift */ | |
170 | 1, /* size (0 = byte, 1 = short, 2 = long) */ | |
171 | 12, /* bitsize */ | |
172 | true, /* pc_relative */ | |
173 | 0, /* bitpos */ | |
174 | complain_overflow_signed, /* complain_on_overflow */ | |
175 | bfd_elf_generic_reloc, /* special_function */ | |
176 | "R_FR30_12_PCREL", /* name */ | |
177 | false, /* partial_inplace */ | |
178 | 0x07ff, /* src_mask */ | |
179 | 0x07ff, /* dst_mask */ | |
180 | true), /* pcrel_offset */ | |
181 | }; | |
182 | \f | |
183 | /* Utility to actually perform an R_FR30_20 reloc. */ | |
184 | ||
185 | static bfd_reloc_status_type | |
186 | fr30_elf_i20_reloc (abfd, reloc_entry, symbol, data, | |
187 | input_section, output_bfd, error_message) | |
188 | bfd * abfd; | |
189 | arelent * reloc_entry; | |
190 | asymbol * symbol; | |
191 | PTR data; | |
192 | asection * input_section; | |
193 | bfd * output_bfd; | |
194 | char ** error_message; | |
195 | { | |
196 | bfd_vma relocation; | |
197 | unsigned long x; | |
198 | ||
199 | /* This part is from bfd_elf_generic_reloc. */ | |
200 | if (output_bfd != (bfd *) NULL | |
201 | && (symbol->flags & BSF_SECTION_SYM) == 0 | |
202 | && (! reloc_entry->howto->partial_inplace | |
203 | || reloc_entry->addend == 0)) | |
204 | { | |
205 | reloc_entry->address += input_section->output_offset; | |
206 | return bfd_reloc_ok; | |
207 | } | |
208 | ||
209 | if (output_bfd != NULL) | |
210 | /* FIXME: See bfd_perform_relocation. Is this right? */ | |
211 | return bfd_reloc_continue; | |
212 | ||
213 | relocation = | |
214 | symbol->value | |
215 | + symbol->section->output_section->vma | |
216 | + symbol->section->output_offset | |
217 | + reloc_entry->addend; | |
218 | ||
219 | if (relocation > ((1U << 20) - 1)) | |
220 | return bfd_reloc_overflow; | |
221 | ||
222 | x = bfd_get_32 (abfd, data + reloc_entry->address); | |
223 | x = (x & 0xff0f0000) | (relocation & 0x0000ffff) | ((relocation & 0x000f0000) << 4); | |
224 | bfd_put_32 (abfd, x, data + reloc_entry->address); | |
225 | ||
226 | return bfd_reloc_ok; | |
227 | } | |
228 | ||
229 | \f | |
230 | /* Map BFD reloc types to FR30 ELF reloc types. */ | |
231 | ||
232 | struct fr30_reloc_map | |
233 | { | |
234 | unsigned char bfd_reloc_val; | |
235 | unsigned char elf_reloc_val; | |
236 | }; | |
237 | ||
238 | static const struct fr30_reloc_map fr30_reloc_map [] = | |
239 | { | |
240 | { BFD_RELOC_NONE, R_FR30_NONE }, | |
241 | { BFD_RELOC_8, R_FR30_8 }, | |
242 | { BFD_RELOC_FR30_20, R_FR30_20 }, | |
243 | { BFD_RELOC_32, R_FR30_32 }, | |
244 | { BFD_RELOC_FR30_6_IN_4, R_FR30_6_IN_4 }, | |
245 | { BFD_RELOC_FR30_8_IN_8, R_FR30_8_IN_8 }, | |
246 | { BFD_RELOC_FR30_9_IN_8, R_FR30_9_IN_8 }, | |
247 | { BFD_RELOC_FR30_10_IN_8, R_FR30_10_IN_8 }, | |
248 | { BFD_RELOC_FR30_9_PCREL, R_FR30_9_PCREL }, | |
249 | { BFD_RELOC_FR30_12_PCREL, R_FR30_12_PCREL }, | |
250 | }; | |
251 | ||
252 | static reloc_howto_type * | |
253 | bfd_elf32_bfd_reloc_type_lookup (abfd, code) | |
254 | bfd * abfd; | |
255 | bfd_reloc_code_real_type code; | |
256 | { | |
257 | unsigned int i; | |
258 | ||
259 | for (i = sizeof (fr30_reloc_map) / sizeof (fr30_reloc_map[0]); | |
260 | --i;) | |
261 | { | |
262 | if (fr30_reloc_map [i].bfd_reloc_val == code) | |
263 | return & fr30_elf_howto_table [fr30_reloc_map[i].elf_reloc_val]; | |
264 | } | |
265 | ||
266 | return NULL; | |
267 | } | |
268 | ||
269 | /* Set the howto pointer for an FR30 ELF reloc. */ | |
270 | ||
271 | static void | |
272 | fr30_info_to_howto_rel (abfd, cache_ptr, dst) | |
273 | bfd * abfd; | |
274 | arelent * cache_ptr; | |
275 | Elf32_Internal_Rela * dst; | |
276 | { | |
277 | unsigned int r_type; | |
278 | ||
279 | r_type = ELF32_R_TYPE (dst->r_info); | |
280 | BFD_ASSERT (r_type < (unsigned int) R_FR30_max); | |
281 | cache_ptr->howto = & fr30_elf_howto_table [r_type]; | |
282 | } | |
283 | \f | |
284 | /* Relocate an FR30 ELF section. | |
285 | There is some attempt to make this function usable for many architectures, | |
286 | both USE_REL and USE_RELA ['twould be nice if such a critter existed], | |
287 | if only to serve as a learning tool. | |
288 | ||
289 | The RELOCATE_SECTION function is called by the new ELF backend linker | |
290 | to handle the relocations for a section. | |
291 | ||
292 | The relocs are always passed as Rela structures; if the section | |
293 | actually uses Rel structures, the r_addend field will always be | |
294 | zero. | |
295 | ||
296 | This function is responsible for adjusting the section contents as | |
297 | necessary, and (if using Rela relocs and generating a relocateable | |
298 | output file) adjusting the reloc addend as necessary. | |
299 | ||
300 | This function does not have to worry about setting the reloc | |
301 | address or the reloc symbol index. | |
302 | ||
303 | LOCAL_SYMS is a pointer to the swapped in local symbols. | |
304 | ||
305 | LOCAL_SECTIONS is an array giving the section in the input file | |
306 | corresponding to the st_shndx field of each local symbol. | |
307 | ||
308 | The global hash table entry for the global symbols can be found | |
309 | via elf_sym_hashes (input_bfd). | |
310 | ||
311 | When generating relocateable output, this function must handle | |
312 | STB_LOCAL/STT_SECTION symbols specially. The output symbol is | |
313 | going to be the section symbol corresponding to the output | |
314 | section, which means that the addend must be adjusted | |
315 | accordingly. */ | |
316 | ||
317 | static boolean | |
318 | fr30_elf_relocate_section (output_bfd, info, input_bfd, input_section, | |
319 | contents, relocs, local_syms, local_sections) | |
320 | bfd * output_bfd; | |
321 | struct bfd_link_info * info; | |
322 | bfd * input_bfd; | |
323 | asection * input_section; | |
324 | bfd_byte * contents; | |
325 | Elf_Internal_Rela * relocs; | |
326 | Elf_Internal_Sym * local_syms; | |
327 | asection ** local_sections; | |
328 | { | |
329 | Elf_Internal_Shdr * symtab_hdr; | |
330 | struct elf_link_hash_entry ** sym_hashes; | |
331 | Elf_Internal_Rela * rel; | |
332 | Elf_Internal_Rela * relend; | |
333 | ||
334 | symtab_hdr = & elf_tdata (input_bfd)->symtab_hdr; | |
335 | sym_hashes = elf_sym_hashes (input_bfd); | |
336 | relend = relocs + input_section->reloc_count; | |
337 | ||
338 | for (rel = relocs; rel < relend; rel ++) | |
339 | { | |
340 | reloc_howto_type * howto; | |
341 | unsigned long r_symndx; | |
342 | Elf_Internal_Sym * sym; | |
343 | asection * sec; | |
344 | struct elf_link_hash_entry * h; | |
345 | bfd_vma relocation; | |
346 | bfd_reloc_status_type r; | |
347 | const char * name; | |
348 | ||
349 | r_symndx = ELF32_R_SYM (rel->r_info); | |
350 | ||
351 | if (info->relocateable) | |
352 | { | |
353 | /* This is a relocateable link. We don't have to change | |
354 | anything, unless the reloc is against a section symbol, | |
355 | in which case we have to adjust according to where the | |
356 | section symbol winds up in the output section. */ | |
357 | if (r_symndx < symtab_hdr->sh_info) | |
358 | { | |
359 | sym = local_syms + r_symndx; | |
360 | ||
361 | if (ELF_ST_TYPE (sym->st_info) == STT_SECTION) | |
362 | { | |
363 | sec = local_sections [r_symndx]; | |
364 | rel->r_addend += sec->output_offset + sym->st_value; | |
365 | } | |
366 | } | |
367 | ||
368 | continue; | |
369 | } | |
370 | ||
371 | /* This is a final link. */ | |
372 | howto = fr30_elf_howto_table + ELF32_R_TYPE (rel->r_info); | |
373 | h = NULL; | |
374 | sym = NULL; | |
375 | sec = NULL; | |
376 | ||
377 | if (r_symndx < symtab_hdr->sh_info) | |
378 | { | |
379 | sym = local_syms + r_symndx; | |
380 | sec = local_sections [r_symndx]; | |
381 | relocation = (sec->output_section->vma | |
382 | + sec->output_offset | |
383 | + sym->st_value); | |
384 | ||
385 | name = bfd_elf_string_from_elf_section | |
386 | (input_bfd, symtab_hdr->sh_link, sym->st_name); | |
387 | name = (name == NULL) ? bfd_section_name (input_bfd, sec) : name; | |
388 | #if 0 | |
389 | fprintf (stderr, "local: sec: %s, sym: %s (%d), value: %x + %x + %x addend %x\n", | |
390 | sec->name, name, sym->st_name, | |
391 | sec->output_section->vma, sec->output_offset, | |
392 | sym->st_value, rel->r_addend); | |
393 | #endif | |
394 | } | |
395 | else | |
396 | { | |
397 | h = sym_hashes [r_symndx - symtab_hdr->sh_info]; | |
398 | ||
399 | while (h->root.type == bfd_link_hash_indirect | |
400 | || h->root.type == bfd_link_hash_warning) | |
401 | h = (struct elf_link_hash_entry *) h->root.u.i.link; | |
402 | ||
403 | name = h->root.root.string; | |
404 | ||
405 | if (h->root.type == bfd_link_hash_defined | |
406 | || h->root.type == bfd_link_hash_defweak) | |
407 | { | |
408 | sec = h->root.u.def.section; | |
409 | relocation = (h->root.u.def.value | |
410 | + sec->output_section->vma | |
411 | + sec->output_offset); | |
412 | #if 0 | |
413 | fprintf (stderr, | |
414 | "defined: sec: %s, name: %s, value: %x + %x + %x gives: %x\n", | |
415 | sec->name, name, h->root.u.def.value, | |
416 | sec->output_section->vma, sec->output_offset, relocation); | |
417 | #endif | |
418 | } | |
419 | else if (h->root.type == bfd_link_hash_undefweak) | |
420 | { | |
421 | #if 0 | |
422 | fprintf (stderr, "undefined: sec: %s, name: %s\n", | |
423 | sec->name, name); | |
424 | #endif | |
425 | relocation = 0; | |
426 | } | |
427 | else | |
428 | { | |
429 | if (! ((*info->callbacks->undefined_symbol) | |
430 | (info, h->root.root.string, input_bfd, | |
431 | input_section, rel->r_offset))) | |
432 | return false; | |
433 | #if 0 | |
434 | fprintf (stderr, "unknown: name: %s\n", name); | |
435 | #endif | |
436 | relocation = 0; | |
437 | } | |
438 | } | |
439 | ||
440 | r = _bfd_final_link_relocate (howto, input_bfd, input_section, | |
441 | contents, rel->r_offset, | |
442 | relocation, rel->r_addend); | |
443 | ||
444 | if (r != bfd_reloc_ok) | |
445 | { | |
446 | const char * msg = (const char *)0; | |
447 | ||
448 | switch (r) | |
449 | { | |
450 | case bfd_reloc_overflow: | |
451 | if (! ((*info->callbacks->reloc_overflow) | |
452 | (info, name, howto->name, (bfd_vma) 0, | |
453 | input_bfd, input_section, rel->r_offset))) | |
454 | return false; | |
455 | break; | |
456 | ||
457 | case bfd_reloc_undefined: | |
458 | if (! ((*info->callbacks->undefined_symbol) | |
459 | (info, name, input_bfd, input_section, | |
460 | rel->r_offset))) | |
461 | return false; | |
462 | break; | |
463 | ||
464 | case bfd_reloc_outofrange: | |
465 | msg = _("internal error: out of range error"); | |
466 | goto common_error; | |
467 | ||
468 | case bfd_reloc_notsupported: | |
469 | msg = _("internal error: unsupported relocation error"); | |
470 | goto common_error; | |
471 | ||
472 | case bfd_reloc_dangerous: | |
473 | msg = _("internal error: dangerous relocation"); | |
474 | goto common_error; | |
475 | ||
476 | case bfd_reloc_other: | |
477 | msg = _("could not locate special linker symbol __gp"); | |
478 | goto common_error; | |
479 | ||
480 | case bfd_reloc_continue: | |
481 | msg = _("could not locate special linker symbol __ep"); | |
482 | goto common_error; | |
483 | ||
484 | case (bfd_reloc_dangerous + 1): | |
485 | msg = _("could not locate special linker symbol __ctbp"); | |
486 | goto common_error; | |
487 | ||
488 | default: | |
489 | msg = _("internal error: unknown error"); | |
490 | /* fall through */ | |
491 | ||
492 | common_error: | |
493 | if (!((*info->callbacks->warning) | |
494 | (info, msg, name, input_bfd, input_section, | |
495 | rel->r_offset))) | |
496 | return false; | |
497 | break; | |
498 | } | |
499 | } | |
500 | } | |
501 | ||
502 | return true; | |
503 | } | |
504 | \f | |
505 | #define ELF_ARCH bfd_arch_fr30 | |
506 | #define ELF_MACHINE_CODE EM_CYGNUS_FR30 | |
507 | #define ELF_MAXPAGESIZE 0x1000 | |
508 | ||
509 | #define TARGET_BIG_SYM bfd_elf32_fr30_vec | |
510 | #define TARGET_BIG_NAME "elf32-fr30" | |
511 | ||
512 | #define elf_info_to_howto 0 | |
513 | #define elf_info_to_howto_rel fr30_info_to_howto_rel | |
514 | #define elf_backend_relocate_section fr30_elf_relocate_section | |
515 | ||
516 | #include "elf32-target.h" |