1 // SPDX-License-Identifier: GPL-2.0
2 /* This is included from relocs_32/64.c */
3
4 #define ElfW(type) _ElfW(ELF_BITS, type)
5 #define _ElfW(bits, type) __ElfW(bits, type)
6 #define __ElfW(bits, type) Elf##bits##_##type
7
8 #define Elf_Addr ElfW(Addr)
9 #define Elf_Ehdr ElfW(Ehdr)
10 #define Elf_Phdr ElfW(Phdr)
11 #define Elf_Shdr ElfW(Shdr)
12 #define Elf_Sym ElfW(Sym)
13
14 static Elf_Ehdr ehdr;
15
16 struct relocs {
17 uint32_t *offset;
18 unsigned long count;
19 unsigned long size;
20 };
21
22 static struct relocs relocs;
23
24 struct section {
25 Elf_Shdr shdr;
26 struct section *link;
27 Elf_Sym *symtab;
28 Elf_Rel *reltab;
29 char *strtab;
30 long shdr_offset;
31 };
32 static struct section *secs;
33
34 static const char * const regex_sym_kernel = {
35 /* Symbols matching these regex's should never be relocated */
36 "^(__crc_)",
37 };
38
39 static regex_t sym_regex_c;
40
regex_skip_reloc(const char * sym_name)41 static int regex_skip_reloc(const char *sym_name)
42 {
43 return !regexec(&sym_regex_c, sym_name, 0, NULL, 0);
44 }
45
regex_init(void)46 static void regex_init(void)
47 {
48 char errbuf[128];
49 int err;
50
51 err = regcomp(&sym_regex_c, regex_sym_kernel,
52 REG_EXTENDED|REG_NOSUB);
53
54 if (err) {
55 regerror(err, &sym_regex_c, errbuf, sizeof(errbuf));
56 die("%s", errbuf);
57 }
58 }
59
rel_type(unsigned type)60 static const char *rel_type(unsigned type)
61 {
62 static const char * const type_name[] = {
63 #define REL_TYPE(X)[X] = #X
64 REL_TYPE(R_MIPS_NONE),
65 REL_TYPE(R_MIPS_16),
66 REL_TYPE(R_MIPS_32),
67 REL_TYPE(R_MIPS_REL32),
68 REL_TYPE(R_MIPS_26),
69 REL_TYPE(R_MIPS_HI16),
70 REL_TYPE(R_MIPS_LO16),
71 REL_TYPE(R_MIPS_GPREL16),
72 REL_TYPE(R_MIPS_LITERAL),
73 REL_TYPE(R_MIPS_GOT16),
74 REL_TYPE(R_MIPS_PC16),
75 REL_TYPE(R_MIPS_CALL16),
76 REL_TYPE(R_MIPS_GPREL32),
77 REL_TYPE(R_MIPS_64),
78 REL_TYPE(R_MIPS_HIGHER),
79 REL_TYPE(R_MIPS_HIGHEST),
80 REL_TYPE(R_MIPS_PC21_S2),
81 REL_TYPE(R_MIPS_PC26_S2),
82 #undef REL_TYPE
83 };
84 const char *name = "unknown type rel type name";
85
86 if (type < ARRAY_SIZE(type_name) && type_name[type])
87 name = type_name[type];
88 return name;
89 }
90
sec_name(unsigned shndx)91 static const char *sec_name(unsigned shndx)
92 {
93 const char *sec_strtab;
94 const char *name;
95
96 sec_strtab = secs[ehdr.e_shstrndx].strtab;
97 if (shndx < ehdr.e_shnum)
98 name = sec_strtab + secs[shndx].shdr.sh_name;
99 else if (shndx == SHN_ABS)
100 name = "ABSOLUTE";
101 else if (shndx == SHN_COMMON)
102 name = "COMMON";
103 else
104 name = "<noname>";
105 return name;
106 }
107
sec_lookup(const char * secname)108 static struct section *sec_lookup(const char *secname)
109 {
110 int i;
111
112 for (i = 0; i < ehdr.e_shnum; i++)
113 if (strcmp(secname, sec_name(i)) == 0)
114 return &secs[i];
115
116 return NULL;
117 }
118
sym_name(const char * sym_strtab,Elf_Sym * sym)119 static const char *sym_name(const char *sym_strtab, Elf_Sym *sym)
120 {
121 const char *name;
122
123 if (sym->st_name)
124 name = sym_strtab + sym->st_name;
125 else
126 name = sec_name(sym->st_shndx);
127 return name;
128 }
129
130 #if BYTE_ORDER == LITTLE_ENDIAN
131 #define le16_to_cpu(val) (val)
132 #define le32_to_cpu(val) (val)
133 #define le64_to_cpu(val) (val)
134 #define be16_to_cpu(val) bswap_16(val)
135 #define be32_to_cpu(val) bswap_32(val)
136 #define be64_to_cpu(val) bswap_64(val)
137
138 #define cpu_to_le16(val) (val)
139 #define cpu_to_le32(val) (val)
140 #define cpu_to_le64(val) (val)
141 #define cpu_to_be16(val) bswap_16(val)
142 #define cpu_to_be32(val) bswap_32(val)
143 #define cpu_to_be64(val) bswap_64(val)
144 #endif
145 #if BYTE_ORDER == BIG_ENDIAN
146 #define le16_to_cpu(val) bswap_16(val)
147 #define le32_to_cpu(val) bswap_32(val)
148 #define le64_to_cpu(val) bswap_64(val)
149 #define be16_to_cpu(val) (val)
150 #define be32_to_cpu(val) (val)
151 #define be64_to_cpu(val) (val)
152
153 #define cpu_to_le16(val) bswap_16(val)
154 #define cpu_to_le32(val) bswap_32(val)
155 #define cpu_to_le64(val) bswap_64(val)
156 #define cpu_to_be16(val) (val)
157 #define cpu_to_be32(val) (val)
158 #define cpu_to_be64(val) (val)
159 #endif
160
elf16_to_cpu(uint16_t val)161 static uint16_t elf16_to_cpu(uint16_t val)
162 {
163 if (ehdr.e_ident[EI_DATA] == ELFDATA2LSB)
164 return le16_to_cpu(val);
165 else
166 return be16_to_cpu(val);
167 }
168
elf32_to_cpu(uint32_t val)169 static uint32_t elf32_to_cpu(uint32_t val)
170 {
171 if (ehdr.e_ident[EI_DATA] == ELFDATA2LSB)
172 return le32_to_cpu(val);
173 else
174 return be32_to_cpu(val);
175 }
176
cpu_to_elf32(uint32_t val)177 static uint32_t cpu_to_elf32(uint32_t val)
178 {
179 if (ehdr.e_ident[EI_DATA] == ELFDATA2LSB)
180 return cpu_to_le32(val);
181 else
182 return cpu_to_be32(val);
183 }
184
185 #define elf_half_to_cpu(x) elf16_to_cpu(x)
186 #define elf_word_to_cpu(x) elf32_to_cpu(x)
187
188 #if ELF_BITS == 64
elf64_to_cpu(uint64_t val)189 static uint64_t elf64_to_cpu(uint64_t val)
190 {
191 if (ehdr.e_ident[EI_DATA] == ELFDATA2LSB)
192 return le64_to_cpu(val);
193 else
194 return be64_to_cpu(val);
195 }
196 #define elf_addr_to_cpu(x) elf64_to_cpu(x)
197 #define elf_off_to_cpu(x) elf64_to_cpu(x)
198 #define elf_xword_to_cpu(x) elf64_to_cpu(x)
199 #else
200 #define elf_addr_to_cpu(x) elf32_to_cpu(x)
201 #define elf_off_to_cpu(x) elf32_to_cpu(x)
202 #define elf_xword_to_cpu(x) elf32_to_cpu(x)
203 #endif
204
read_ehdr(FILE * fp)205 static void read_ehdr(FILE *fp)
206 {
207 if (fread(&ehdr, sizeof(ehdr), 1, fp) != 1)
208 die("Cannot read ELF header: %s\n", strerror(errno));
209
210 if (memcmp(ehdr.e_ident, ELFMAG, SELFMAG) != 0)
211 die("No ELF magic\n");
212
213 if (ehdr.e_ident[EI_CLASS] != ELF_CLASS)
214 die("Not a %d bit executable\n", ELF_BITS);
215
216 if ((ehdr.e_ident[EI_DATA] != ELFDATA2LSB) &&
217 (ehdr.e_ident[EI_DATA] != ELFDATA2MSB))
218 die("Unknown ELF Endianness\n");
219
220 if (ehdr.e_ident[EI_VERSION] != EV_CURRENT)
221 die("Unknown ELF version\n");
222
223 /* Convert the fields to native endian */
224 ehdr.e_type = elf_half_to_cpu(ehdr.e_type);
225 ehdr.e_machine = elf_half_to_cpu(ehdr.e_machine);
226 ehdr.e_version = elf_word_to_cpu(ehdr.e_version);
227 ehdr.e_entry = elf_addr_to_cpu(ehdr.e_entry);
228 ehdr.e_phoff = elf_off_to_cpu(ehdr.e_phoff);
229 ehdr.e_shoff = elf_off_to_cpu(ehdr.e_shoff);
230 ehdr.e_flags = elf_word_to_cpu(ehdr.e_flags);
231 ehdr.e_ehsize = elf_half_to_cpu(ehdr.e_ehsize);
232 ehdr.e_phentsize = elf_half_to_cpu(ehdr.e_phentsize);
233 ehdr.e_phnum = elf_half_to_cpu(ehdr.e_phnum);
234 ehdr.e_shentsize = elf_half_to_cpu(ehdr.e_shentsize);
235 ehdr.e_shnum = elf_half_to_cpu(ehdr.e_shnum);
236 ehdr.e_shstrndx = elf_half_to_cpu(ehdr.e_shstrndx);
237
238 if ((ehdr.e_type != ET_EXEC) && (ehdr.e_type != ET_DYN))
239 die("Unsupported ELF header type\n");
240
241 if (ehdr.e_machine != ELF_MACHINE)
242 die("Not for %s\n", ELF_MACHINE_NAME);
243
244 if (ehdr.e_version != EV_CURRENT)
245 die("Unknown ELF version\n");
246
247 if (ehdr.e_ehsize != sizeof(Elf_Ehdr))
248 die("Bad ELF header size\n");
249
250 if (ehdr.e_phentsize != sizeof(Elf_Phdr))
251 die("Bad program header entry\n");
252
253 if (ehdr.e_shentsize != sizeof(Elf_Shdr))
254 die("Bad section header entry\n");
255
256 if (ehdr.e_shstrndx >= ehdr.e_shnum)
257 die("String table index out of bounds\n");
258 }
259
read_shdrs(FILE * fp)260 static void read_shdrs(FILE *fp)
261 {
262 int i;
263 Elf_Shdr shdr;
264
265 secs = calloc(ehdr.e_shnum, sizeof(struct section));
266 if (!secs)
267 die("Unable to allocate %d section headers\n", ehdr.e_shnum);
268
269 if (fseek(fp, ehdr.e_shoff, SEEK_SET) < 0)
270 die("Seek to %d failed: %s\n", ehdr.e_shoff, strerror(errno));
271
272 for (i = 0; i < ehdr.e_shnum; i++) {
273 struct section *sec = &secs[i];
274
275 sec->shdr_offset = ftell(fp);
276 if (fread(&shdr, sizeof(shdr), 1, fp) != 1)
277 die("Cannot read ELF section headers %d/%d: %s\n",
278 i, ehdr.e_shnum, strerror(errno));
279 sec->shdr.sh_name = elf_word_to_cpu(shdr.sh_name);
280 sec->shdr.sh_type = elf_word_to_cpu(shdr.sh_type);
281 sec->shdr.sh_flags = elf_xword_to_cpu(shdr.sh_flags);
282 sec->shdr.sh_addr = elf_addr_to_cpu(shdr.sh_addr);
283 sec->shdr.sh_offset = elf_off_to_cpu(shdr.sh_offset);
284 sec->shdr.sh_size = elf_xword_to_cpu(shdr.sh_size);
285 sec->shdr.sh_link = elf_word_to_cpu(shdr.sh_link);
286 sec->shdr.sh_info = elf_word_to_cpu(shdr.sh_info);
287 sec->shdr.sh_addralign = elf_xword_to_cpu(shdr.sh_addralign);
288 sec->shdr.sh_entsize = elf_xword_to_cpu(shdr.sh_entsize);
289 if (sec->shdr.sh_link < ehdr.e_shnum)
290 sec->link = &secs[sec->shdr.sh_link];
291 }
292 }
293
read_strtabs(FILE * fp)294 static void read_strtabs(FILE *fp)
295 {
296 int i;
297
298 for (i = 0; i < ehdr.e_shnum; i++) {
299 struct section *sec = &secs[i];
300
301 if (sec->shdr.sh_type != SHT_STRTAB)
302 continue;
303
304 sec->strtab = malloc(sec->shdr.sh_size);
305 if (!sec->strtab)
306 die("malloc of %d bytes for strtab failed\n",
307 sec->shdr.sh_size);
308
309 if (fseek(fp, sec->shdr.sh_offset, SEEK_SET) < 0)
310 die("Seek to %d failed: %s\n",
311 sec->shdr.sh_offset, strerror(errno));
312
313 if (fread(sec->strtab, 1, sec->shdr.sh_size, fp) !=
314 sec->shdr.sh_size)
315 die("Cannot read symbol table: %s\n", strerror(errno));
316 }
317 }
318
read_symtabs(FILE * fp)319 static void read_symtabs(FILE *fp)
320 {
321 int i, j;
322
323 for (i = 0; i < ehdr.e_shnum; i++) {
324 struct section *sec = &secs[i];
325 if (sec->shdr.sh_type != SHT_SYMTAB)
326 continue;
327
328 sec->symtab = malloc(sec->shdr.sh_size);
329 if (!sec->symtab)
330 die("malloc of %d bytes for symtab failed\n",
331 sec->shdr.sh_size);
332
333 if (fseek(fp, sec->shdr.sh_offset, SEEK_SET) < 0)
334 die("Seek to %d failed: %s\n",
335 sec->shdr.sh_offset, strerror(errno));
336
337 if (fread(sec->symtab, 1, sec->shdr.sh_size, fp) !=
338 sec->shdr.sh_size)
339 die("Cannot read symbol table: %s\n", strerror(errno));
340
341 for (j = 0; j < sec->shdr.sh_size/sizeof(Elf_Sym); j++) {
342 Elf_Sym *sym = &sec->symtab[j];
343
344 sym->st_name = elf_word_to_cpu(sym->st_name);
345 sym->st_value = elf_addr_to_cpu(sym->st_value);
346 sym->st_size = elf_xword_to_cpu(sym->st_size);
347 sym->st_shndx = elf_half_to_cpu(sym->st_shndx);
348 }
349 }
350 }
351
read_relocs(FILE * fp)352 static void read_relocs(FILE *fp)
353 {
354 static unsigned long base;
355 int i, j;
356
357 if (!base) {
358 struct section *sec = sec_lookup(".text");
359
360 if (!sec)
361 die("Could not find .text section\n");
362
363 base = sec->shdr.sh_addr;
364 }
365
366 for (i = 0; i < ehdr.e_shnum; i++) {
367 struct section *sec = &secs[i];
368
369 if (sec->shdr.sh_type != SHT_REL_TYPE)
370 continue;
371
372 sec->reltab = malloc(sec->shdr.sh_size);
373 if (!sec->reltab)
374 die("malloc of %d bytes for relocs failed\n",
375 sec->shdr.sh_size);
376
377 if (fseek(fp, sec->shdr.sh_offset, SEEK_SET) < 0)
378 die("Seek to %d failed: %s\n",
379 sec->shdr.sh_offset, strerror(errno));
380
381 if (fread(sec->reltab, 1, sec->shdr.sh_size, fp) !=
382 sec->shdr.sh_size)
383 die("Cannot read symbol table: %s\n", strerror(errno));
384
385 for (j = 0; j < sec->shdr.sh_size/sizeof(Elf_Rel); j++) {
386 Elf_Rel *rel = &sec->reltab[j];
387
388 rel->r_offset = elf_addr_to_cpu(rel->r_offset);
389 /* Set offset into kernel image */
390 rel->r_offset -= base;
391 #if (ELF_BITS == 32)
392 rel->r_info = elf_xword_to_cpu(rel->r_info);
393 #else
394 /* Convert MIPS64 RELA format - only the symbol
395 * index needs converting to native endianness
396 */
397 rel->r_info = rel->r_info;
398 ELF_R_SYM(rel->r_info) = elf32_to_cpu(ELF_R_SYM(rel->r_info));
399 #endif
400 #if (SHT_REL_TYPE == SHT_RELA)
401 rel->r_addend = elf_xword_to_cpu(rel->r_addend);
402 #endif
403 }
404 }
405 }
406
remove_relocs(FILE * fp)407 static void remove_relocs(FILE *fp)
408 {
409 int i;
410 Elf_Shdr shdr;
411
412 for (i = 0; i < ehdr.e_shnum; i++) {
413 struct section *sec = &secs[i];
414
415 if (sec->shdr.sh_type != SHT_REL_TYPE)
416 continue;
417
418 if (fseek(fp, sec->shdr_offset, SEEK_SET) < 0)
419 die("Seek to %d failed: %s\n",
420 sec->shdr_offset, strerror(errno));
421
422 if (fread(&shdr, sizeof(shdr), 1, fp) != 1)
423 die("Cannot read ELF section headers %d/%d: %s\n",
424 i, ehdr.e_shnum, strerror(errno));
425
426 /* Set relocation section size to 0, effectively removing it.
427 * This is necessary due to lack of support for relocations
428 * in objcopy when creating 32bit elf from 64bit elf.
429 */
430 shdr.sh_size = 0;
431
432 if (fseek(fp, sec->shdr_offset, SEEK_SET) < 0)
433 die("Seek to %d failed: %s\n",
434 sec->shdr_offset, strerror(errno));
435
436 if (fwrite(&shdr, sizeof(shdr), 1, fp) != 1)
437 die("Cannot write ELF section headers %d/%d: %s\n",
438 i, ehdr.e_shnum, strerror(errno));
439 }
440 }
441
add_reloc(struct relocs * r,uint32_t offset,unsigned type)442 static void add_reloc(struct relocs *r, uint32_t offset, unsigned type)
443 {
444 /* Relocation representation in binary table:
445 * |76543210|76543210|76543210|76543210|
446 * | Type | offset from _text >> 2 |
447 */
448 offset >>= 2;
449 if (offset > 0x00FFFFFF)
450 die("Kernel image exceeds maximum size for relocation!\n");
451
452 offset = (offset & 0x00FFFFFF) | ((type & 0xFF) << 24);
453
454 if (r->count == r->size) {
455 unsigned long newsize = r->size + 50000;
456 void *mem = realloc(r->offset, newsize * sizeof(r->offset[0]));
457
458 if (!mem)
459 die("realloc failed\n");
460
461 r->offset = mem;
462 r->size = newsize;
463 }
464 r->offset[r->count++] = offset;
465 }
466
walk_relocs(int (* process)(struct section * sec,Elf_Rel * rel,Elf_Sym * sym,const char * symname))467 static void walk_relocs(int (*process)(struct section *sec, Elf_Rel *rel,
468 Elf_Sym *sym, const char *symname))
469 {
470 int i;
471 struct section *extab_sec = sec_lookup("__ex_table");
472 int extab_index = extab_sec ? extab_sec - secs : -1;
473
474 /* Walk through the relocations */
475 for (i = 0; i < ehdr.e_shnum; i++) {
476 char *sym_strtab;
477 Elf_Sym *sh_symtab;
478 struct section *sec_applies, *sec_symtab;
479 int j;
480 struct section *sec = &secs[i];
481
482 if (sec->shdr.sh_type != SHT_REL_TYPE)
483 continue;
484
485 if (sec->shdr.sh_info == extab_index)
486 continue;
487
488 sec_symtab = sec->link;
489 sec_applies = &secs[sec->shdr.sh_info];
490 if (!(sec_applies->shdr.sh_flags & SHF_ALLOC))
491 continue;
492
493 sh_symtab = sec_symtab->symtab;
494 sym_strtab = sec_symtab->link->strtab;
495 for (j = 0; j < sec->shdr.sh_size/sizeof(Elf_Rel); j++) {
496 Elf_Rel *rel = &sec->reltab[j];
497 Elf_Sym *sym = &sh_symtab[ELF_R_SYM(rel->r_info)];
498 const char *symname = sym_name(sym_strtab, sym);
499
500 process(sec, rel, sym, symname);
501 }
502 }
503 }
504
do_reloc(struct section * sec,Elf_Rel * rel,Elf_Sym * sym,const char * symname)505 static int do_reloc(struct section *sec, Elf_Rel *rel, Elf_Sym *sym,
506 const char *symname)
507 {
508 unsigned r_type = ELF_R_TYPE(rel->r_info);
509 unsigned bind = ELF_ST_BIND(sym->st_info);
510
511 if ((bind == STB_WEAK) && (sym->st_value == 0)) {
512 /* Don't relocate weak symbols without a target */
513 return 0;
514 }
515
516 if (regex_skip_reloc(symname))
517 return 0;
518
519 switch (r_type) {
520 case R_MIPS_NONE:
521 case R_MIPS_REL32:
522 case R_MIPS_PC16:
523 case R_MIPS_PC21_S2:
524 case R_MIPS_PC26_S2:
525 /*
526 * NONE can be ignored and PC relative relocations don't
527 * need to be adjusted.
528 */
529 case R_MIPS_HIGHEST:
530 case R_MIPS_HIGHER:
531 /* We support relocating within the same 4Gb segment only,
532 * thus leaving the top 32bits unchanged
533 */
534 case R_MIPS_LO16:
535 /* We support relocating by 64k jumps only
536 * thus leaving the bottom 16bits unchanged
537 */
538 break;
539
540 case R_MIPS_64:
541 case R_MIPS_32:
542 case R_MIPS_26:
543 case R_MIPS_HI16:
544 add_reloc(&relocs, rel->r_offset, r_type);
545 break;
546
547 default:
548 die("Unsupported relocation type: %s (%d)\n",
549 rel_type(r_type), r_type);
550 break;
551 }
552
553 return 0;
554 }
555
write_reloc_as_bin(uint32_t v,FILE * f)556 static int write_reloc_as_bin(uint32_t v, FILE *f)
557 {
558 unsigned char buf[4];
559
560 v = cpu_to_elf32(v);
561
562 memcpy(buf, &v, sizeof(uint32_t));
563 return fwrite(buf, 1, 4, f);
564 }
565
write_reloc_as_text(uint32_t v,FILE * f)566 static int write_reloc_as_text(uint32_t v, FILE *f)
567 {
568 int res;
569
570 res = fprintf(f, "\t.long 0x%08"PRIx32"\n", v);
571 if (res < 0)
572 return res;
573 else
574 return sizeof(uint32_t);
575 }
576
emit_relocs(int as_text,int as_bin,FILE * outf)577 static void emit_relocs(int as_text, int as_bin, FILE *outf)
578 {
579 int i;
580 int (*write_reloc)(uint32_t, FILE *) = write_reloc_as_bin;
581 int size = 0;
582 int size_reserved;
583 struct section *sec_reloc;
584
585 sec_reloc = sec_lookup(".data.reloc");
586 if (!sec_reloc)
587 die("Could not find relocation section\n");
588
589 size_reserved = sec_reloc->shdr.sh_size;
590
591 /* Collect up the relocations */
592 walk_relocs(do_reloc);
593
594 /* Print the relocations */
595 if (as_text) {
596 /* Print the relocations in a form suitable that
597 * gas will like.
598 */
599 printf(".section \".data.reloc\",\"a\"\n");
600 printf(".balign 4\n");
601 /* Output text to stdout */
602 write_reloc = write_reloc_as_text;
603 outf = stdout;
604 } else if (as_bin) {
605 /* Output raw binary to stdout */
606 outf = stdout;
607 } else {
608 /* Seek to offset of the relocation section.
609 * Each relocation is then written into the
610 * vmlinux kernel image.
611 */
612 if (fseek(outf, sec_reloc->shdr.sh_offset, SEEK_SET) < 0) {
613 die("Seek to %d failed: %s\n",
614 sec_reloc->shdr.sh_offset, strerror(errno));
615 }
616 }
617
618 for (i = 0; i < relocs.count; i++)
619 size += write_reloc(relocs.offset[i], outf);
620
621 /* Print a stop, but only if we've actually written some relocs */
622 if (size)
623 size += write_reloc(0, outf);
624
625 if (size > size_reserved)
626 /* Die, but suggest a value for CONFIG_RELOCATION_TABLE_SIZE
627 * which will fix this problem and allow a bit of headroom
628 * if more kernel features are enabled
629 */
630 die("Relocations overflow available space!\n" \
631 "Please adjust CONFIG_RELOCATION_TABLE_SIZE " \
632 "to at least 0x%08x\n", (size + 0x1000) & ~0xFFF);
633 }
634
635 /*
636 * As an aid to debugging problems with different linkers
637 * print summary information about the relocs.
638 * Since different linkers tend to emit the sections in
639 * different orders we use the section names in the output.
640 */
do_reloc_info(struct section * sec,Elf_Rel * rel,ElfW (Sym)* sym,const char * symname)641 static int do_reloc_info(struct section *sec, Elf_Rel *rel, ElfW(Sym) *sym,
642 const char *symname)
643 {
644 printf("%16s 0x%08x %16s %40s %16s\n",
645 sec_name(sec->shdr.sh_info),
646 (unsigned int)rel->r_offset,
647 rel_type(ELF_R_TYPE(rel->r_info)),
648 symname,
649 sec_name(sym->st_shndx));
650 return 0;
651 }
652
print_reloc_info(void)653 static void print_reloc_info(void)
654 {
655 printf("%16s %10s %16s %40s %16s\n",
656 "reloc section",
657 "offset",
658 "reloc type",
659 "symbol",
660 "symbol section");
661 walk_relocs(do_reloc_info);
662 }
663
664 #if ELF_BITS == 64
665 # define process process_64
666 #else
667 # define process process_32
668 #endif
669
process(FILE * fp,int as_text,int as_bin,int show_reloc_info,int keep_relocs)670 void process(FILE *fp, int as_text, int as_bin,
671 int show_reloc_info, int keep_relocs)
672 {
673 regex_init();
674 read_ehdr(fp);
675 read_shdrs(fp);
676 read_strtabs(fp);
677 read_symtabs(fp);
678 read_relocs(fp);
679 if (show_reloc_info) {
680 print_reloc_info();
681 return;
682 }
683 emit_relocs(as_text, as_bin, fp);
684 if (!keep_relocs)
685 remove_relocs(fp);
686 }
687