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TOMOYO Linux Cross Reference
Linux/arch/mips/boot/tools/relocs.c

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  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 
 41 static int regex_skip_reloc(const char *sym_name)
 42 {
 43         return !regexec(&sym_regex_c, sym_name, 0, NULL, 0);
 44 }
 45 
 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 
 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 
 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 
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 
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 
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 
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 
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
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 
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 
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 
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 
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 
352 static void read_relocs(FILE *fp)
353 {
354         static unsigned long base = 0;
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 
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 
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 
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 
472         /* Walk through the relocations */
473         for (i = 0; i < ehdr.e_shnum; i++) {
474                 char *sym_strtab;
475                 Elf_Sym *sh_symtab;
476                 struct section *sec_applies, *sec_symtab;
477                 int j;
478                 struct section *sec = &secs[i];
479 
480                 if (sec->shdr.sh_type != SHT_REL_TYPE)
481                         continue;
482 
483                 sec_symtab  = sec->link;
484                 sec_applies = &secs[sec->shdr.sh_info];
485                 if (!(sec_applies->shdr.sh_flags & SHF_ALLOC))
486                         continue;
487 
488                 sh_symtab = sec_symtab->symtab;
489                 sym_strtab = sec_symtab->link->strtab;
490                 for (j = 0; j < sec->shdr.sh_size/sizeof(Elf_Rel); j++) {
491                         Elf_Rel *rel = &sec->reltab[j];
492                         Elf_Sym *sym = &sh_symtab[ELF_R_SYM(rel->r_info)];
493                         const char *symname = sym_name(sym_strtab, sym);
494 
495                         process(sec, rel, sym, symname);
496                 }
497         }
498 }
499 
500 static int do_reloc(struct section *sec, Elf_Rel *rel, Elf_Sym *sym,
501                       const char *symname)
502 {
503         unsigned r_type = ELF_R_TYPE(rel->r_info);
504         unsigned bind = ELF_ST_BIND(sym->st_info);
505 
506         if ((bind == STB_WEAK) && (sym->st_value == 0)) {
507                 /* Don't relocate weak symbols without a target */
508                 return 0;
509         }
510 
511         if (regex_skip_reloc(symname))
512                 return 0;
513 
514         switch (r_type) {
515         case R_MIPS_NONE:
516         case R_MIPS_REL32:
517         case R_MIPS_PC16:
518         case R_MIPS_PC21_S2:
519         case R_MIPS_PC26_S2:
520                 /*
521                  * NONE can be ignored and PC relative relocations don't
522                  * need to be adjusted.
523                  */
524         case R_MIPS_HIGHEST:
525         case R_MIPS_HIGHER:
526                 /* We support relocating within the same 4Gb segment only,
527                  * thus leaving the top 32bits unchanged
528                  */
529         case R_MIPS_LO16:
530                 /* We support relocating by 64k jumps only
531                  * thus leaving the bottom 16bits unchanged
532                  */
533                 break;
534 
535         case R_MIPS_64:
536         case R_MIPS_32:
537         case R_MIPS_26:
538         case R_MIPS_HI16:
539                 add_reloc(&relocs, rel->r_offset, r_type);
540                 break;
541 
542         default:
543                 die("Unsupported relocation type: %s (%d)\n",
544                     rel_type(r_type), r_type);
545                 break;
546         }
547 
548         return 0;
549 }
550 
551 static int write_reloc_as_bin(uint32_t v, FILE *f)
552 {
553         unsigned char buf[4];
554 
555         v = cpu_to_elf32(v);
556 
557         memcpy(buf, &v, sizeof(uint32_t));
558         return fwrite(buf, 1, 4, f);
559 }
560 
561 static int write_reloc_as_text(uint32_t v, FILE *f)
562 {
563         int res;
564 
565         res = fprintf(f, "\t.long 0x%08"PRIx32"\n", v);
566         if (res < 0)
567                 return res;
568         else
569                 return sizeof(uint32_t);
570 }
571 
572 static void emit_relocs(int as_text, int as_bin, FILE *outf)
573 {
574         int i;
575         int (*write_reloc)(uint32_t, FILE *) = write_reloc_as_bin;
576         int size = 0;
577         int size_reserved;
578         struct section *sec_reloc;
579 
580         sec_reloc = sec_lookup(".data.reloc");
581         if (!sec_reloc)
582                 die("Could not find relocation section\n");
583 
584         size_reserved = sec_reloc->shdr.sh_size;
585 
586         /* Collect up the relocations */
587         walk_relocs(do_reloc);
588 
589         /* Print the relocations */
590         if (as_text) {
591                 /* Print the relocations in a form suitable that
592                  * gas will like.
593                  */
594                 printf(".section \".data.reloc\",\"a\"\n");
595                 printf(".balign 4\n");
596                 /* Output text to stdout */
597                 write_reloc = write_reloc_as_text;
598                 outf = stdout;
599         } else if (as_bin) {
600                 /* Output raw binary to stdout */
601                 outf = stdout;
602         } else {
603                 /* Seek to offset of the relocation section.
604                 * Each relocation is then written into the
605                 * vmlinux kernel image.
606                 */
607                 if (fseek(outf, sec_reloc->shdr.sh_offset, SEEK_SET) < 0) {
608                         die("Seek to %d failed: %s\n",
609                                 sec_reloc->shdr.sh_offset, strerror(errno));
610                 }
611         }
612 
613         for (i = 0; i < relocs.count; i++)
614                 size += write_reloc(relocs.offset[i], outf);
615 
616         /* Print a stop, but only if we've actually written some relocs */
617         if (size)
618                 size += write_reloc(0, outf);
619 
620         if (size > size_reserved)
621                 /* Die, but suggest a value for CONFIG_RELOCATION_TABLE_SIZE
622                  * which will fix this problem and allow a bit of headroom
623                  * if more kernel features are enabled
624                  */
625                 die("Relocations overflow available space!\n" \
626                     "Please adjust CONFIG_RELOCATION_TABLE_SIZE " \
627                     "to at least 0x%08x\n", (size + 0x1000) & ~0xFFF);
628 }
629 
630 /*
631  * As an aid to debugging problems with different linkers
632  * print summary information about the relocs.
633  * Since different linkers tend to emit the sections in
634  * different orders we use the section names in the output.
635  */
636 static int do_reloc_info(struct section *sec, Elf_Rel *rel, ElfW(Sym) *sym,
637                                 const char *symname)
638 {
639         printf("%16s  0x%08x  %16s  %40s  %16s\n",
640                 sec_name(sec->shdr.sh_info),
641                 (unsigned int)rel->r_offset,
642                 rel_type(ELF_R_TYPE(rel->r_info)),
643                 symname,
644                 sec_name(sym->st_shndx));
645         return 0;
646 }
647 
648 static void print_reloc_info(void)
649 {
650         printf("%16s  %10s  %16s  %40s  %16s\n",
651                 "reloc section",
652                 "offset",
653                 "reloc type",
654                 "symbol",
655                 "symbol section");
656         walk_relocs(do_reloc_info);
657 }
658 
659 #if ELF_BITS == 64
660 # define process process_64
661 #else
662 # define process process_32
663 #endif
664 
665 void process(FILE *fp, int as_text, int as_bin,
666              int show_reloc_info, int keep_relocs)
667 {
668         regex_init();
669         read_ehdr(fp);
670         read_shdrs(fp);
671         read_strtabs(fp);
672         read_symtabs(fp);
673         read_relocs(fp);
674         if (show_reloc_info) {
675                 print_reloc_info();
676                 return;
677         }
678         emit_relocs(as_text, as_bin, fp);
679         if (!keep_relocs)
680                 remove_relocs(fp);
681 }
682 

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