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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
14static Elf_Ehdr ehdr;
15static unsigned long shnum;
16static unsigned int shstrndx;
17static unsigned int shsymtabndx;
18static unsigned int shxsymtabndx;
19
20static int sym_index(Elf_Sym *sym);
21
22struct relocs {
23 uint32_t *offset;
24 unsigned long count;
25 unsigned long size;
26};
27
28static struct relocs relocs16;
29static struct relocs relocs32;
30#if ELF_BITS == 64
31static struct relocs relocs32neg;
32static struct relocs relocs64;
33#define FMT PRIu64
34#else
35#define FMT PRIu32
36#endif
37
38struct section {
39 Elf_Shdr shdr;
40 struct section *link;
41 Elf_Sym *symtab;
42 Elf32_Word *xsymtab;
43 Elf_Rel *reltab;
44 char *strtab;
45};
46static struct section *secs;
47
48static const char * const sym_regex_kernel[S_NSYMTYPES] = {
49/*
50 * Following symbols have been audited. There values are constant and do
51 * not change if bzImage is loaded at a different physical address than
52 * the address for which it has been compiled. Don't warn user about
53 * absolute relocations present w.r.t these symbols.
54 */
55 [S_ABS] =
56 "^(xen_irq_disable_direct_reloc$|"
57 "xen_save_fl_direct_reloc$|"
58 "VDSO|"
59 "__kcfi_typeid_|"
60 "__crc_)",
61
62/*
63 * These symbols are known to be relative, even if the linker marks them
64 * as absolute (typically defined outside any section in the linker script.)
65 */
66 [S_REL] =
67 "^(__init_(begin|end)|"
68 "__x86_cpu_dev_(start|end)|"
69 "__alt_instructions(_end)?|"
70 "(__iommu_table|__apicdrivers|__smp_locks)(_end)?|"
71 "__(start|end)_pci_.*|"
72#if CONFIG_FW_LOADER
73 "__(start|end)_builtin_fw|"
74#endif
75 "__(start|stop)___ksymtab(_gpl)?|"
76 "__(start|stop)___kcrctab(_gpl)?|"
77 "__(start|stop)___param|"
78 "__(start|stop)___modver|"
79 "__(start|stop)___bug_table|"
80 "__tracedata_(start|end)|"
81 "__(start|stop)_notes|"
82 "__end_rodata|"
83 "__end_rodata_aligned|"
84 "__initramfs_start|"
85 "(jiffies|jiffies_64)|"
86#if ELF_BITS == 64
87 "__per_cpu_load|"
88 "init_per_cpu__.*|"
89 "__end_rodata_hpage_align|"
90#endif
91 "__vvar_page|"
92 "_end)$"
93};
94
95
96static const char * const sym_regex_realmode[S_NSYMTYPES] = {
97/*
98 * These symbols are known to be relative, even if the linker marks them
99 * as absolute (typically defined outside any section in the linker script.)
100 */
101 [S_REL] =
102 "^pa_",
103
104/*
105 * These are 16-bit segment symbols when compiling 16-bit code.
106 */
107 [S_SEG] =
108 "^real_mode_seg$",
109
110/*
111 * These are offsets belonging to segments, as opposed to linear addresses,
112 * when compiling 16-bit code.
113 */
114 [S_LIN] =
115 "^pa_",
116};
117
118static const char * const *sym_regex;
119
120static regex_t sym_regex_c[S_NSYMTYPES];
121static int is_reloc(enum symtype type, const char *sym_name)
122{
123 return sym_regex[type] &&
124 !regexec(&sym_regex_c[type], sym_name, 0, NULL, 0);
125}
126
127static void regex_init(int use_real_mode)
128{
129 char errbuf[128];
130 int err;
131 int i;
132
133 if (use_real_mode)
134 sym_regex = sym_regex_realmode;
135 else
136 sym_regex = sym_regex_kernel;
137
138 for (i = 0; i < S_NSYMTYPES; i++) {
139 if (!sym_regex[i])
140 continue;
141
142 err = regcomp(&sym_regex_c[i], sym_regex[i],
143 REG_EXTENDED|REG_NOSUB);
144
145 if (err) {
146 regerror(err, &sym_regex_c[i], errbuf, sizeof(errbuf));
147 die("%s", errbuf);
148 }
149 }
150}
151
152static const char *sym_type(unsigned type)
153{
154 static const char *type_name[] = {
155#define SYM_TYPE(X) [X] = #X
156 SYM_TYPE(STT_NOTYPE),
157 SYM_TYPE(STT_OBJECT),
158 SYM_TYPE(STT_FUNC),
159 SYM_TYPE(STT_SECTION),
160 SYM_TYPE(STT_FILE),
161 SYM_TYPE(STT_COMMON),
162 SYM_TYPE(STT_TLS),
163#undef SYM_TYPE
164 };
165 const char *name = "unknown sym type name";
166 if (type < ARRAY_SIZE(type_name)) {
167 name = type_name[type];
168 }
169 return name;
170}
171
172static const char *sym_bind(unsigned bind)
173{
174 static const char *bind_name[] = {
175#define SYM_BIND(X) [X] = #X
176 SYM_BIND(STB_LOCAL),
177 SYM_BIND(STB_GLOBAL),
178 SYM_BIND(STB_WEAK),
179#undef SYM_BIND
180 };
181 const char *name = "unknown sym bind name";
182 if (bind < ARRAY_SIZE(bind_name)) {
183 name = bind_name[bind];
184 }
185 return name;
186}
187
188static const char *sym_visibility(unsigned visibility)
189{
190 static const char *visibility_name[] = {
191#define SYM_VISIBILITY(X) [X] = #X
192 SYM_VISIBILITY(STV_DEFAULT),
193 SYM_VISIBILITY(STV_INTERNAL),
194 SYM_VISIBILITY(STV_HIDDEN),
195 SYM_VISIBILITY(STV_PROTECTED),
196#undef SYM_VISIBILITY
197 };
198 const char *name = "unknown sym visibility name";
199 if (visibility < ARRAY_SIZE(visibility_name)) {
200 name = visibility_name[visibility];
201 }
202 return name;
203}
204
205static const char *rel_type(unsigned type)
206{
207 static const char *type_name[] = {
208#define REL_TYPE(X) [X] = #X
209#if ELF_BITS == 64
210 REL_TYPE(R_X86_64_NONE),
211 REL_TYPE(R_X86_64_64),
212 REL_TYPE(R_X86_64_PC64),
213 REL_TYPE(R_X86_64_PC32),
214 REL_TYPE(R_X86_64_GOT32),
215 REL_TYPE(R_X86_64_PLT32),
216 REL_TYPE(R_X86_64_COPY),
217 REL_TYPE(R_X86_64_GLOB_DAT),
218 REL_TYPE(R_X86_64_JUMP_SLOT),
219 REL_TYPE(R_X86_64_RELATIVE),
220 REL_TYPE(R_X86_64_GOTPCREL),
221 REL_TYPE(R_X86_64_32),
222 REL_TYPE(R_X86_64_32S),
223 REL_TYPE(R_X86_64_16),
224 REL_TYPE(R_X86_64_PC16),
225 REL_TYPE(R_X86_64_8),
226 REL_TYPE(R_X86_64_PC8),
227#else
228 REL_TYPE(R_386_NONE),
229 REL_TYPE(R_386_32),
230 REL_TYPE(R_386_PC32),
231 REL_TYPE(R_386_GOT32),
232 REL_TYPE(R_386_PLT32),
233 REL_TYPE(R_386_COPY),
234 REL_TYPE(R_386_GLOB_DAT),
235 REL_TYPE(R_386_JMP_SLOT),
236 REL_TYPE(R_386_RELATIVE),
237 REL_TYPE(R_386_GOTOFF),
238 REL_TYPE(R_386_GOTPC),
239 REL_TYPE(R_386_8),
240 REL_TYPE(R_386_PC8),
241 REL_TYPE(R_386_16),
242 REL_TYPE(R_386_PC16),
243#endif
244#undef REL_TYPE
245 };
246 const char *name = "unknown type rel type name";
247 if (type < ARRAY_SIZE(type_name) && type_name[type]) {
248 name = type_name[type];
249 }
250 return name;
251}
252
253static const char *sec_name(unsigned shndx)
254{
255 const char *sec_strtab;
256 const char *name;
257 sec_strtab = secs[shstrndx].strtab;
258 name = "<noname>";
259 if (shndx < shnum) {
260 name = sec_strtab + secs[shndx].shdr.sh_name;
261 }
262 else if (shndx == SHN_ABS) {
263 name = "ABSOLUTE";
264 }
265 else if (shndx == SHN_COMMON) {
266 name = "COMMON";
267 }
268 return name;
269}
270
271static const char *sym_name(const char *sym_strtab, Elf_Sym *sym)
272{
273 const char *name;
274 name = "<noname>";
275 if (sym->st_name) {
276 name = sym_strtab + sym->st_name;
277 }
278 else {
279 name = sec_name(sym_index(sym));
280 }
281 return name;
282}
283
284static Elf_Sym *sym_lookup(const char *symname)
285{
286 int i;
287 for (i = 0; i < shnum; i++) {
288 struct section *sec = &secs[i];
289 long nsyms;
290 char *strtab;
291 Elf_Sym *symtab;
292 Elf_Sym *sym;
293
294 if (sec->shdr.sh_type != SHT_SYMTAB)
295 continue;
296
297 nsyms = sec->shdr.sh_size/sizeof(Elf_Sym);
298 symtab = sec->symtab;
299 strtab = sec->link->strtab;
300
301 for (sym = symtab; --nsyms >= 0; sym++) {
302 if (!sym->st_name)
303 continue;
304 if (strcmp(symname, strtab + sym->st_name) == 0)
305 return sym;
306 }
307 }
308 return 0;
309}
310
311#if BYTE_ORDER == LITTLE_ENDIAN
312#define le16_to_cpu(val) (val)
313#define le32_to_cpu(val) (val)
314#define le64_to_cpu(val) (val)
315#endif
316#if BYTE_ORDER == BIG_ENDIAN
317#define le16_to_cpu(val) bswap_16(val)
318#define le32_to_cpu(val) bswap_32(val)
319#define le64_to_cpu(val) bswap_64(val)
320#endif
321
322static uint16_t elf16_to_cpu(uint16_t val)
323{
324 return le16_to_cpu(val);
325}
326
327static uint32_t elf32_to_cpu(uint32_t val)
328{
329 return le32_to_cpu(val);
330}
331
332#define elf_half_to_cpu(x) elf16_to_cpu(x)
333#define elf_word_to_cpu(x) elf32_to_cpu(x)
334
335#if ELF_BITS == 64
336static uint64_t elf64_to_cpu(uint64_t val)
337{
338 return le64_to_cpu(val);
339}
340#define elf_addr_to_cpu(x) elf64_to_cpu(x)
341#define elf_off_to_cpu(x) elf64_to_cpu(x)
342#define elf_xword_to_cpu(x) elf64_to_cpu(x)
343#else
344#define elf_addr_to_cpu(x) elf32_to_cpu(x)
345#define elf_off_to_cpu(x) elf32_to_cpu(x)
346#define elf_xword_to_cpu(x) elf32_to_cpu(x)
347#endif
348
349static int sym_index(Elf_Sym *sym)
350{
351 Elf_Sym *symtab = secs[shsymtabndx].symtab;
352 Elf32_Word *xsymtab = secs[shxsymtabndx].xsymtab;
353 unsigned long offset;
354 int index;
355
356 if (sym->st_shndx != SHN_XINDEX)
357 return sym->st_shndx;
358
359 /* calculate offset of sym from head of table. */
360 offset = (unsigned long)sym - (unsigned long)symtab;
361 index = offset / sizeof(*sym);
362
363 return elf32_to_cpu(xsymtab[index]);
364}
365
366static void read_ehdr(FILE *fp)
367{
368 if (fread(&ehdr, sizeof(ehdr), 1, fp) != 1) {
369 die("Cannot read ELF header: %s\n",
370 strerror(errno));
371 }
372 if (memcmp(ehdr.e_ident, ELFMAG, SELFMAG) != 0) {
373 die("No ELF magic\n");
374 }
375 if (ehdr.e_ident[EI_CLASS] != ELF_CLASS) {
376 die("Not a %d bit executable\n", ELF_BITS);
377 }
378 if (ehdr.e_ident[EI_DATA] != ELFDATA2LSB) {
379 die("Not a LSB ELF executable\n");
380 }
381 if (ehdr.e_ident[EI_VERSION] != EV_CURRENT) {
382 die("Unknown ELF version\n");
383 }
384 /* Convert the fields to native endian */
385 ehdr.e_type = elf_half_to_cpu(ehdr.e_type);
386 ehdr.e_machine = elf_half_to_cpu(ehdr.e_machine);
387 ehdr.e_version = elf_word_to_cpu(ehdr.e_version);
388 ehdr.e_entry = elf_addr_to_cpu(ehdr.e_entry);
389 ehdr.e_phoff = elf_off_to_cpu(ehdr.e_phoff);
390 ehdr.e_shoff = elf_off_to_cpu(ehdr.e_shoff);
391 ehdr.e_flags = elf_word_to_cpu(ehdr.e_flags);
392 ehdr.e_ehsize = elf_half_to_cpu(ehdr.e_ehsize);
393 ehdr.e_phentsize = elf_half_to_cpu(ehdr.e_phentsize);
394 ehdr.e_phnum = elf_half_to_cpu(ehdr.e_phnum);
395 ehdr.e_shentsize = elf_half_to_cpu(ehdr.e_shentsize);
396 ehdr.e_shnum = elf_half_to_cpu(ehdr.e_shnum);
397 ehdr.e_shstrndx = elf_half_to_cpu(ehdr.e_shstrndx);
398
399 shnum = ehdr.e_shnum;
400 shstrndx = ehdr.e_shstrndx;
401
402 if ((ehdr.e_type != ET_EXEC) && (ehdr.e_type != ET_DYN))
403 die("Unsupported ELF header type\n");
404 if (ehdr.e_machine != ELF_MACHINE)
405 die("Not for %s\n", ELF_MACHINE_NAME);
406 if (ehdr.e_version != EV_CURRENT)
407 die("Unknown ELF version\n");
408 if (ehdr.e_ehsize != sizeof(Elf_Ehdr))
409 die("Bad ELF header size\n");
410 if (ehdr.e_phentsize != sizeof(Elf_Phdr))
411 die("Bad program header entry\n");
412 if (ehdr.e_shentsize != sizeof(Elf_Shdr))
413 die("Bad section header entry\n");
414
415
416 if (shnum == SHN_UNDEF || shstrndx == SHN_XINDEX) {
417 Elf_Shdr shdr;
418
419 if (fseek(fp, ehdr.e_shoff, SEEK_SET) < 0)
420 die("Seek to %" FMT " failed: %s\n", ehdr.e_shoff, strerror(errno));
421
422 if (fread(&shdr, sizeof(shdr), 1, fp) != 1)
423 die("Cannot read initial ELF section header: %s\n", strerror(errno));
424
425 if (shnum == SHN_UNDEF)
426 shnum = elf_xword_to_cpu(shdr.sh_size);
427
428 if (shstrndx == SHN_XINDEX)
429 shstrndx = elf_word_to_cpu(shdr.sh_link);
430 }
431
432 if (shstrndx >= shnum)
433 die("String table index out of bounds\n");
434}
435
436static void read_shdrs(FILE *fp)
437{
438 int i;
439 Elf_Shdr shdr;
440
441 secs = calloc(shnum, sizeof(struct section));
442 if (!secs) {
443 die("Unable to allocate %ld section headers\n",
444 shnum);
445 }
446 if (fseek(fp, ehdr.e_shoff, SEEK_SET) < 0) {
447 die("Seek to %" FMT " failed: %s\n",
448 ehdr.e_shoff, strerror(errno));
449 }
450 for (i = 0; i < shnum; i++) {
451 struct section *sec = &secs[i];
452 if (fread(&shdr, sizeof(shdr), 1, fp) != 1)
453 die("Cannot read ELF section headers %d/%ld: %s\n",
454 i, shnum, strerror(errno));
455 sec->shdr.sh_name = elf_word_to_cpu(shdr.sh_name);
456 sec->shdr.sh_type = elf_word_to_cpu(shdr.sh_type);
457 sec->shdr.sh_flags = elf_xword_to_cpu(shdr.sh_flags);
458 sec->shdr.sh_addr = elf_addr_to_cpu(shdr.sh_addr);
459 sec->shdr.sh_offset = elf_off_to_cpu(shdr.sh_offset);
460 sec->shdr.sh_size = elf_xword_to_cpu(shdr.sh_size);
461 sec->shdr.sh_link = elf_word_to_cpu(shdr.sh_link);
462 sec->shdr.sh_info = elf_word_to_cpu(shdr.sh_info);
463 sec->shdr.sh_addralign = elf_xword_to_cpu(shdr.sh_addralign);
464 sec->shdr.sh_entsize = elf_xword_to_cpu(shdr.sh_entsize);
465 if (sec->shdr.sh_link < shnum)
466 sec->link = &secs[sec->shdr.sh_link];
467 }
468
469}
470
471static void read_strtabs(FILE *fp)
472{
473 int i;
474 for (i = 0; i < shnum; i++) {
475 struct section *sec = &secs[i];
476 if (sec->shdr.sh_type != SHT_STRTAB) {
477 continue;
478 }
479 sec->strtab = malloc(sec->shdr.sh_size);
480 if (!sec->strtab) {
481 die("malloc of %" FMT " bytes for strtab failed\n",
482 sec->shdr.sh_size);
483 }
484 if (fseek(fp, sec->shdr.sh_offset, SEEK_SET) < 0) {
485 die("Seek to %" FMT " failed: %s\n",
486 sec->shdr.sh_offset, strerror(errno));
487 }
488 if (fread(sec->strtab, 1, sec->shdr.sh_size, fp)
489 != sec->shdr.sh_size) {
490 die("Cannot read symbol table: %s\n",
491 strerror(errno));
492 }
493 }
494}
495
496static void read_symtabs(FILE *fp)
497{
498 int i,j;
499
500 for (i = 0; i < shnum; i++) {
501 struct section *sec = &secs[i];
502 int num_syms;
503
504 switch (sec->shdr.sh_type) {
505 case SHT_SYMTAB_SHNDX:
506 sec->xsymtab = malloc(sec->shdr.sh_size);
507 if (!sec->xsymtab) {
508 die("malloc of %" FMT " bytes for xsymtab failed\n",
509 sec->shdr.sh_size);
510 }
511 if (fseek(fp, sec->shdr.sh_offset, SEEK_SET) < 0) {
512 die("Seek to %" FMT " failed: %s\n",
513 sec->shdr.sh_offset, strerror(errno));
514 }
515 if (fread(sec->xsymtab, 1, sec->shdr.sh_size, fp)
516 != sec->shdr.sh_size) {
517 die("Cannot read extended symbol table: %s\n",
518 strerror(errno));
519 }
520 shxsymtabndx = i;
521 continue;
522
523 case SHT_SYMTAB:
524 num_syms = sec->shdr.sh_size / sizeof(Elf_Sym);
525
526 sec->symtab = malloc(sec->shdr.sh_size);
527 if (!sec->symtab) {
528 die("malloc of %" FMT " bytes for symtab failed\n",
529 sec->shdr.sh_size);
530 }
531 if (fseek(fp, sec->shdr.sh_offset, SEEK_SET) < 0) {
532 die("Seek to %" FMT " failed: %s\n",
533 sec->shdr.sh_offset, strerror(errno));
534 }
535 if (fread(sec->symtab, 1, sec->shdr.sh_size, fp)
536 != sec->shdr.sh_size) {
537 die("Cannot read symbol table: %s\n",
538 strerror(errno));
539 }
540 for (j = 0; j < num_syms; j++) {
541 Elf_Sym *sym = &sec->symtab[j];
542
543 sym->st_name = elf_word_to_cpu(sym->st_name);
544 sym->st_value = elf_addr_to_cpu(sym->st_value);
545 sym->st_size = elf_xword_to_cpu(sym->st_size);
546 sym->st_shndx = elf_half_to_cpu(sym->st_shndx);
547 }
548 shsymtabndx = i;
549 continue;
550
551 default:
552 continue;
553 }
554 }
555}
556
557
558static void read_relocs(FILE *fp)
559{
560 int i,j;
561 for (i = 0; i < shnum; i++) {
562 struct section *sec = &secs[i];
563 if (sec->shdr.sh_type != SHT_REL_TYPE) {
564 continue;
565 }
566 sec->reltab = malloc(sec->shdr.sh_size);
567 if (!sec->reltab) {
568 die("malloc of %" FMT " bytes for relocs failed\n",
569 sec->shdr.sh_size);
570 }
571 if (fseek(fp, sec->shdr.sh_offset, SEEK_SET) < 0) {
572 die("Seek to %" FMT " failed: %s\n",
573 sec->shdr.sh_offset, strerror(errno));
574 }
575 if (fread(sec->reltab, 1, sec->shdr.sh_size, fp)
576 != sec->shdr.sh_size) {
577 die("Cannot read symbol table: %s\n",
578 strerror(errno));
579 }
580 for (j = 0; j < sec->shdr.sh_size/sizeof(Elf_Rel); j++) {
581 Elf_Rel *rel = &sec->reltab[j];
582 rel->r_offset = elf_addr_to_cpu(rel->r_offset);
583 rel->r_info = elf_xword_to_cpu(rel->r_info);
584#if (SHT_REL_TYPE == SHT_RELA)
585 rel->r_addend = elf_xword_to_cpu(rel->r_addend);
586#endif
587 }
588 }
589}
590
591
592static void print_absolute_symbols(void)
593{
594 int i;
595 const char *format;
596
597 if (ELF_BITS == 64)
598 format = "%5d %016"PRIx64" %5"PRId64" %10s %10s %12s %s\n";
599 else
600 format = "%5d %08"PRIx32" %5"PRId32" %10s %10s %12s %s\n";
601
602 printf("Absolute symbols\n");
603 printf(" Num: Value Size Type Bind Visibility Name\n");
604 for (i = 0; i < shnum; i++) {
605 struct section *sec = &secs[i];
606 char *sym_strtab;
607 int j;
608
609 if (sec->shdr.sh_type != SHT_SYMTAB) {
610 continue;
611 }
612 sym_strtab = sec->link->strtab;
613 for (j = 0; j < sec->shdr.sh_size/sizeof(Elf_Sym); j++) {
614 Elf_Sym *sym;
615 const char *name;
616 sym = &sec->symtab[j];
617 name = sym_name(sym_strtab, sym);
618 if (sym->st_shndx != SHN_ABS) {
619 continue;
620 }
621 printf(format,
622 j, sym->st_value, sym->st_size,
623 sym_type(ELF_ST_TYPE(sym->st_info)),
624 sym_bind(ELF_ST_BIND(sym->st_info)),
625 sym_visibility(ELF_ST_VISIBILITY(sym->st_other)),
626 name);
627 }
628 }
629 printf("\n");
630}
631
632static void print_absolute_relocs(void)
633{
634 int i, printed = 0;
635 const char *format;
636
637 if (ELF_BITS == 64)
638 format = "%016"PRIx64" %016"PRIx64" %10s %016"PRIx64" %s\n";
639 else
640 format = "%08"PRIx32" %08"PRIx32" %10s %08"PRIx32" %s\n";
641
642 for (i = 0; i < shnum; i++) {
643 struct section *sec = &secs[i];
644 struct section *sec_applies, *sec_symtab;
645 char *sym_strtab;
646 Elf_Sym *sh_symtab;
647 int j;
648 if (sec->shdr.sh_type != SHT_REL_TYPE) {
649 continue;
650 }
651 sec_symtab = sec->link;
652 sec_applies = &secs[sec->shdr.sh_info];
653 if (!(sec_applies->shdr.sh_flags & SHF_ALLOC)) {
654 continue;
655 }
656 sh_symtab = sec_symtab->symtab;
657 sym_strtab = sec_symtab->link->strtab;
658 for (j = 0; j < sec->shdr.sh_size/sizeof(Elf_Rel); j++) {
659 Elf_Rel *rel;
660 Elf_Sym *sym;
661 const char *name;
662 rel = &sec->reltab[j];
663 sym = &sh_symtab[ELF_R_SYM(rel->r_info)];
664 name = sym_name(sym_strtab, sym);
665 if (sym->st_shndx != SHN_ABS) {
666 continue;
667 }
668
669 /* Absolute symbols are not relocated if bzImage is
670 * loaded at a non-compiled address. Display a warning
671 * to user at compile time about the absolute
672 * relocations present.
673 *
674 * User need to audit the code to make sure
675 * some symbols which should have been section
676 * relative have not become absolute because of some
677 * linker optimization or wrong programming usage.
678 *
679 * Before warning check if this absolute symbol
680 * relocation is harmless.
681 */
682 if (is_reloc(S_ABS, name) || is_reloc(S_REL, name))
683 continue;
684
685 if (!printed) {
686 printf("WARNING: Absolute relocations"
687 " present\n");
688 printf("Offset Info Type Sym.Value "
689 "Sym.Name\n");
690 printed = 1;
691 }
692
693 printf(format,
694 rel->r_offset,
695 rel->r_info,
696 rel_type(ELF_R_TYPE(rel->r_info)),
697 sym->st_value,
698 name);
699 }
700 }
701
702 if (printed)
703 printf("\n");
704}
705
706static void add_reloc(struct relocs *r, uint32_t offset)
707{
708 if (r->count == r->size) {
709 unsigned long newsize = r->size + 50000;
710 void *mem = realloc(r->offset, newsize * sizeof(r->offset[0]));
711
712 if (!mem)
713 die("realloc of %ld entries for relocs failed\n",
714 newsize);
715 r->offset = mem;
716 r->size = newsize;
717 }
718 r->offset[r->count++] = offset;
719}
720
721static void walk_relocs(int (*process)(struct section *sec, Elf_Rel *rel,
722 Elf_Sym *sym, const char *symname))
723{
724 int i;
725 /* Walk through the relocations */
726 for (i = 0; i < shnum; i++) {
727 char *sym_strtab;
728 Elf_Sym *sh_symtab;
729 struct section *sec_applies, *sec_symtab;
730 int j;
731 struct section *sec = &secs[i];
732
733 if (sec->shdr.sh_type != SHT_REL_TYPE) {
734 continue;
735 }
736 sec_symtab = sec->link;
737 sec_applies = &secs[sec->shdr.sh_info];
738 if (!(sec_applies->shdr.sh_flags & SHF_ALLOC)) {
739 continue;
740 }
741 sh_symtab = sec_symtab->symtab;
742 sym_strtab = sec_symtab->link->strtab;
743 for (j = 0; j < sec->shdr.sh_size/sizeof(Elf_Rel); j++) {
744 Elf_Rel *rel = &sec->reltab[j];
745 Elf_Sym *sym = &sh_symtab[ELF_R_SYM(rel->r_info)];
746 const char *symname = sym_name(sym_strtab, sym);
747
748 process(sec, rel, sym, symname);
749 }
750 }
751}
752
753/*
754 * The .data..percpu section is a special case for x86_64 SMP kernels.
755 * It is used to initialize the actual per_cpu areas and to provide
756 * definitions for the per_cpu variables that correspond to their offsets
757 * within the percpu area. Since the values of all of the symbols need
758 * to be offsets from the start of the per_cpu area the virtual address
759 * (sh_addr) of .data..percpu is 0 in SMP kernels.
760 *
761 * This means that:
762 *
763 * Relocations that reference symbols in the per_cpu area do not
764 * need further relocation (since the value is an offset relative
765 * to the start of the per_cpu area that does not change).
766 *
767 * Relocations that apply to the per_cpu area need to have their
768 * offset adjusted by by the value of __per_cpu_load to make them
769 * point to the correct place in the loaded image (because the
770 * virtual address of .data..percpu is 0).
771 *
772 * For non SMP kernels .data..percpu is linked as part of the normal
773 * kernel data and does not require special treatment.
774 *
775 */
776static int per_cpu_shndx = -1;
777static Elf_Addr per_cpu_load_addr;
778
779static void percpu_init(void)
780{
781 int i;
782 for (i = 0; i < shnum; i++) {
783 ElfW(Sym) *sym;
784 if (strcmp(sec_name(i), ".data..percpu"))
785 continue;
786
787 if (secs[i].shdr.sh_addr != 0) /* non SMP kernel */
788 return;
789
790 sym = sym_lookup("__per_cpu_load");
791 if (!sym)
792 die("can't find __per_cpu_load\n");
793
794 per_cpu_shndx = i;
795 per_cpu_load_addr = sym->st_value;
796 return;
797 }
798}
799
800#if ELF_BITS == 64
801
802/*
803 * Check to see if a symbol lies in the .data..percpu section.
804 *
805 * The linker incorrectly associates some symbols with the
806 * .data..percpu section so we also need to check the symbol
807 * name to make sure that we classify the symbol correctly.
808 *
809 * The GNU linker incorrectly associates:
810 * __init_begin
811 * __per_cpu_load
812 *
813 * The "gold" linker incorrectly associates:
814 * init_per_cpu__fixed_percpu_data
815 * init_per_cpu__gdt_page
816 */
817static int is_percpu_sym(ElfW(Sym) *sym, const char *symname)
818{
819 int shndx = sym_index(sym);
820
821 return (shndx == per_cpu_shndx) &&
822 strcmp(symname, "__init_begin") &&
823 strcmp(symname, "__per_cpu_load") &&
824 strncmp(symname, "init_per_cpu_", 13);
825}
826
827
828static int do_reloc64(struct section *sec, Elf_Rel *rel, ElfW(Sym) *sym,
829 const char *symname)
830{
831 unsigned r_type = ELF64_R_TYPE(rel->r_info);
832 ElfW(Addr) offset = rel->r_offset;
833 int shn_abs = (sym->st_shndx == SHN_ABS) && !is_reloc(S_REL, symname);
834
835 if (sym->st_shndx == SHN_UNDEF)
836 return 0;
837
838 /*
839 * Adjust the offset if this reloc applies to the percpu section.
840 */
841 if (sec->shdr.sh_info == per_cpu_shndx)
842 offset += per_cpu_load_addr;
843
844 switch (r_type) {
845 case R_X86_64_NONE:
846 /* NONE can be ignored. */
847 break;
848
849 case R_X86_64_PC32:
850 case R_X86_64_PLT32:
851 /*
852 * PC relative relocations don't need to be adjusted unless
853 * referencing a percpu symbol.
854 *
855 * NB: R_X86_64_PLT32 can be treated as R_X86_64_PC32.
856 */
857 if (is_percpu_sym(sym, symname))
858 add_reloc(&relocs32neg, offset);
859 break;
860
861 case R_X86_64_PC64:
862 /*
863 * Only used by jump labels
864 */
865 if (is_percpu_sym(sym, symname))
866 die("Invalid R_X86_64_PC64 relocation against per-CPU symbol %s\n",
867 symname);
868 break;
869
870 case R_X86_64_32:
871 case R_X86_64_32S:
872 case R_X86_64_64:
873 /*
874 * References to the percpu area don't need to be adjusted.
875 */
876 if (is_percpu_sym(sym, symname))
877 break;
878
879 if (shn_abs) {
880 /*
881 * Whitelisted absolute symbols do not require
882 * relocation.
883 */
884 if (is_reloc(S_ABS, symname))
885 break;
886
887 die("Invalid absolute %s relocation: %s\n",
888 rel_type(r_type), symname);
889 break;
890 }
891
892 /*
893 * Relocation offsets for 64 bit kernels are output
894 * as 32 bits and sign extended back to 64 bits when
895 * the relocations are processed.
896 * Make sure that the offset will fit.
897 */
898 if ((int32_t)offset != (int64_t)offset)
899 die("Relocation offset doesn't fit in 32 bits\n");
900
901 if (r_type == R_X86_64_64)
902 add_reloc(&relocs64, offset);
903 else
904 add_reloc(&relocs32, offset);
905 break;
906
907 default:
908 die("Unsupported relocation type: %s (%d)\n",
909 rel_type(r_type), r_type);
910 break;
911 }
912
913 return 0;
914}
915
916#else
917
918static int do_reloc32(struct section *sec, Elf_Rel *rel, Elf_Sym *sym,
919 const char *symname)
920{
921 unsigned r_type = ELF32_R_TYPE(rel->r_info);
922 int shn_abs = (sym->st_shndx == SHN_ABS) && !is_reloc(S_REL, symname);
923
924 switch (r_type) {
925 case R_386_NONE:
926 case R_386_PC32:
927 case R_386_PC16:
928 case R_386_PC8:
929 case R_386_PLT32:
930 /*
931 * NONE can be ignored and PC relative relocations don't need
932 * to be adjusted. Because sym must be defined, R_386_PLT32 can
933 * be treated the same way as R_386_PC32.
934 */
935 break;
936
937 case R_386_32:
938 if (shn_abs) {
939 /*
940 * Whitelisted absolute symbols do not require
941 * relocation.
942 */
943 if (is_reloc(S_ABS, symname))
944 break;
945
946 die("Invalid absolute %s relocation: %s\n",
947 rel_type(r_type), symname);
948 break;
949 }
950
951 add_reloc(&relocs32, rel->r_offset);
952 break;
953
954 default:
955 die("Unsupported relocation type: %s (%d)\n",
956 rel_type(r_type), r_type);
957 break;
958 }
959
960 return 0;
961}
962
963static int do_reloc_real(struct section *sec, Elf_Rel *rel, Elf_Sym *sym,
964 const char *symname)
965{
966 unsigned r_type = ELF32_R_TYPE(rel->r_info);
967 int shn_abs = (sym->st_shndx == SHN_ABS) && !is_reloc(S_REL, symname);
968
969 switch (r_type) {
970 case R_386_NONE:
971 case R_386_PC32:
972 case R_386_PC16:
973 case R_386_PC8:
974 case R_386_PLT32:
975 /*
976 * NONE can be ignored and PC relative relocations don't need
977 * to be adjusted. Because sym must be defined, R_386_PLT32 can
978 * be treated the same way as R_386_PC32.
979 */
980 break;
981
982 case R_386_16:
983 if (shn_abs) {
984 /*
985 * Whitelisted absolute symbols do not require
986 * relocation.
987 */
988 if (is_reloc(S_ABS, symname))
989 break;
990
991 if (is_reloc(S_SEG, symname)) {
992 add_reloc(&relocs16, rel->r_offset);
993 break;
994 }
995 } else {
996 if (!is_reloc(S_LIN, symname))
997 break;
998 }
999 die("Invalid %s %s relocation: %s\n",
1000 shn_abs ? "absolute" : "relative",
1001 rel_type(r_type), symname);
1002 break;
1003
1004 case R_386_32:
1005 if (shn_abs) {
1006 /*
1007 * Whitelisted absolute symbols do not require
1008 * relocation.
1009 */
1010 if (is_reloc(S_ABS, symname))
1011 break;
1012
1013 if (is_reloc(S_REL, symname)) {
1014 add_reloc(&relocs32, rel->r_offset);
1015 break;
1016 }
1017 } else {
1018 if (is_reloc(S_LIN, symname))
1019 add_reloc(&relocs32, rel->r_offset);
1020 break;
1021 }
1022 die("Invalid %s %s relocation: %s\n",
1023 shn_abs ? "absolute" : "relative",
1024 rel_type(r_type), symname);
1025 break;
1026
1027 default:
1028 die("Unsupported relocation type: %s (%d)\n",
1029 rel_type(r_type), r_type);
1030 break;
1031 }
1032
1033 return 0;
1034}
1035
1036#endif
1037
1038static int cmp_relocs(const void *va, const void *vb)
1039{
1040 const uint32_t *a, *b;
1041 a = va; b = vb;
1042 return (*a == *b)? 0 : (*a > *b)? 1 : -1;
1043}
1044
1045static void sort_relocs(struct relocs *r)
1046{
1047 qsort(r->offset, r->count, sizeof(r->offset[0]), cmp_relocs);
1048}
1049
1050static int write32(uint32_t v, FILE *f)
1051{
1052 unsigned char buf[4];
1053
1054 put_unaligned_le32(v, buf);
1055 return fwrite(buf, 1, 4, f) == 4 ? 0 : -1;
1056}
1057
1058static int write32_as_text(uint32_t v, FILE *f)
1059{
1060 return fprintf(f, "\t.long 0x%08"PRIx32"\n", v) > 0 ? 0 : -1;
1061}
1062
1063static void emit_relocs(int as_text, int use_real_mode)
1064{
1065 int i;
1066 int (*write_reloc)(uint32_t, FILE *) = write32;
1067 int (*do_reloc)(struct section *sec, Elf_Rel *rel, Elf_Sym *sym,
1068 const char *symname);
1069
1070#if ELF_BITS == 64
1071 if (!use_real_mode)
1072 do_reloc = do_reloc64;
1073 else
1074 die("--realmode not valid for a 64-bit ELF file");
1075#else
1076 if (!use_real_mode)
1077 do_reloc = do_reloc32;
1078 else
1079 do_reloc = do_reloc_real;
1080#endif
1081
1082 /* Collect up the relocations */
1083 walk_relocs(do_reloc);
1084
1085 if (relocs16.count && !use_real_mode)
1086 die("Segment relocations found but --realmode not specified\n");
1087
1088 /* Order the relocations for more efficient processing */
1089 sort_relocs(&relocs32);
1090#if ELF_BITS == 64
1091 sort_relocs(&relocs32neg);
1092 sort_relocs(&relocs64);
1093#else
1094 sort_relocs(&relocs16);
1095#endif
1096
1097 /* Print the relocations */
1098 if (as_text) {
1099 /* Print the relocations in a form suitable that
1100 * gas will like.
1101 */
1102 printf(".section \".data.reloc\",\"a\"\n");
1103 printf(".balign 4\n");
1104 write_reloc = write32_as_text;
1105 }
1106
1107 if (use_real_mode) {
1108 write_reloc(relocs16.count, stdout);
1109 for (i = 0; i < relocs16.count; i++)
1110 write_reloc(relocs16.offset[i], stdout);
1111
1112 write_reloc(relocs32.count, stdout);
1113 for (i = 0; i < relocs32.count; i++)
1114 write_reloc(relocs32.offset[i], stdout);
1115 } else {
1116#if ELF_BITS == 64
1117 /* Print a stop */
1118 write_reloc(0, stdout);
1119
1120 /* Now print each relocation */
1121 for (i = 0; i < relocs64.count; i++)
1122 write_reloc(relocs64.offset[i], stdout);
1123
1124 /* Print a stop */
1125 write_reloc(0, stdout);
1126
1127 /* Now print each inverse 32-bit relocation */
1128 for (i = 0; i < relocs32neg.count; i++)
1129 write_reloc(relocs32neg.offset[i], stdout);
1130#endif
1131
1132 /* Print a stop */
1133 write_reloc(0, stdout);
1134
1135 /* Now print each relocation */
1136 for (i = 0; i < relocs32.count; i++)
1137 write_reloc(relocs32.offset[i], stdout);
1138 }
1139}
1140
1141/*
1142 * As an aid to debugging problems with different linkers
1143 * print summary information about the relocs.
1144 * Since different linkers tend to emit the sections in
1145 * different orders we use the section names in the output.
1146 */
1147static int do_reloc_info(struct section *sec, Elf_Rel *rel, ElfW(Sym) *sym,
1148 const char *symname)
1149{
1150 printf("%s\t%s\t%s\t%s\n",
1151 sec_name(sec->shdr.sh_info),
1152 rel_type(ELF_R_TYPE(rel->r_info)),
1153 symname,
1154 sec_name(sym_index(sym)));
1155 return 0;
1156}
1157
1158static void print_reloc_info(void)
1159{
1160 printf("reloc section\treloc type\tsymbol\tsymbol section\n");
1161 walk_relocs(do_reloc_info);
1162}
1163
1164#if ELF_BITS == 64
1165# define process process_64
1166#else
1167# define process process_32
1168#endif
1169
1170void process(FILE *fp, int use_real_mode, int as_text,
1171 int show_absolute_syms, int show_absolute_relocs,
1172 int show_reloc_info)
1173{
1174 regex_init(use_real_mode);
1175 read_ehdr(fp);
1176 read_shdrs(fp);
1177 read_strtabs(fp);
1178 read_symtabs(fp);
1179 read_relocs(fp);
1180 if (ELF_BITS == 64)
1181 percpu_init();
1182 if (show_absolute_syms) {
1183 print_absolute_symbols();
1184 return;
1185 }
1186 if (show_absolute_relocs) {
1187 print_absolute_relocs();
1188 return;
1189 }
1190 if (show_reloc_info) {
1191 print_reloc_info();
1192 return;
1193 }
1194 emit_relocs(as_text, use_real_mode);
1195}
1/* This is included from relocs_32/64.c */
2
3#define ElfW(type) _ElfW(ELF_BITS, type)
4#define _ElfW(bits, type) __ElfW(bits, type)
5#define __ElfW(bits, type) Elf##bits##_##type
6
7#define Elf_Addr ElfW(Addr)
8#define Elf_Ehdr ElfW(Ehdr)
9#define Elf_Phdr ElfW(Phdr)
10#define Elf_Shdr ElfW(Shdr)
11#define Elf_Sym ElfW(Sym)
12
13static Elf_Ehdr ehdr;
14
15struct relocs {
16 uint32_t *offset;
17 unsigned long count;
18 unsigned long size;
19};
20
21static struct relocs relocs16;
22static struct relocs relocs32;
23#if ELF_BITS == 64
24static struct relocs relocs32neg;
25static struct relocs relocs64;
26#endif
27
28struct section {
29 Elf_Shdr shdr;
30 struct section *link;
31 Elf_Sym *symtab;
32 Elf_Rel *reltab;
33 char *strtab;
34};
35static struct section *secs;
36
37static const char * const sym_regex_kernel[S_NSYMTYPES] = {
38/*
39 * Following symbols have been audited. There values are constant and do
40 * not change if bzImage is loaded at a different physical address than
41 * the address for which it has been compiled. Don't warn user about
42 * absolute relocations present w.r.t these symbols.
43 */
44 [S_ABS] =
45 "^(xen_irq_disable_direct_reloc$|"
46 "xen_save_fl_direct_reloc$|"
47 "VDSO|"
48 "__crc_)",
49
50/*
51 * These symbols are known to be relative, even if the linker marks them
52 * as absolute (typically defined outside any section in the linker script.)
53 */
54 [S_REL] =
55 "^(__init_(begin|end)|"
56 "__x86_cpu_dev_(start|end)|"
57 "(__parainstructions|__alt_instructions)(|_end)|"
58 "(__iommu_table|__apicdrivers|__smp_locks)(|_end)|"
59 "__(start|end)_pci_.*|"
60 "__(start|end)_builtin_fw|"
61 "__(start|stop)___ksymtab(|_gpl|_unused|_unused_gpl|_gpl_future)|"
62 "__(start|stop)___kcrctab(|_gpl|_unused|_unused_gpl|_gpl_future)|"
63 "__(start|stop)___param|"
64 "__(start|stop)___modver|"
65 "__(start|stop)___bug_table|"
66 "__tracedata_(start|end)|"
67 "__(start|stop)_notes|"
68 "__end_rodata|"
69 "__initramfs_start|"
70 "(jiffies|jiffies_64)|"
71#if ELF_BITS == 64
72 "__per_cpu_load|"
73 "init_per_cpu__.*|"
74 "__end_rodata_hpage_align|"
75#endif
76 "__vvar_page|"
77 "_end)$"
78};
79
80
81static const char * const sym_regex_realmode[S_NSYMTYPES] = {
82/*
83 * These symbols are known to be relative, even if the linker marks them
84 * as absolute (typically defined outside any section in the linker script.)
85 */
86 [S_REL] =
87 "^pa_",
88
89/*
90 * These are 16-bit segment symbols when compiling 16-bit code.
91 */
92 [S_SEG] =
93 "^real_mode_seg$",
94
95/*
96 * These are offsets belonging to segments, as opposed to linear addresses,
97 * when compiling 16-bit code.
98 */
99 [S_LIN] =
100 "^pa_",
101};
102
103static const char * const *sym_regex;
104
105static regex_t sym_regex_c[S_NSYMTYPES];
106static int is_reloc(enum symtype type, const char *sym_name)
107{
108 return sym_regex[type] &&
109 !regexec(&sym_regex_c[type], sym_name, 0, NULL, 0);
110}
111
112static void regex_init(int use_real_mode)
113{
114 char errbuf[128];
115 int err;
116 int i;
117
118 if (use_real_mode)
119 sym_regex = sym_regex_realmode;
120 else
121 sym_regex = sym_regex_kernel;
122
123 for (i = 0; i < S_NSYMTYPES; i++) {
124 if (!sym_regex[i])
125 continue;
126
127 err = regcomp(&sym_regex_c[i], sym_regex[i],
128 REG_EXTENDED|REG_NOSUB);
129
130 if (err) {
131 regerror(err, &sym_regex_c[i], errbuf, sizeof errbuf);
132 die("%s", errbuf);
133 }
134 }
135}
136
137static const char *sym_type(unsigned type)
138{
139 static const char *type_name[] = {
140#define SYM_TYPE(X) [X] = #X
141 SYM_TYPE(STT_NOTYPE),
142 SYM_TYPE(STT_OBJECT),
143 SYM_TYPE(STT_FUNC),
144 SYM_TYPE(STT_SECTION),
145 SYM_TYPE(STT_FILE),
146 SYM_TYPE(STT_COMMON),
147 SYM_TYPE(STT_TLS),
148#undef SYM_TYPE
149 };
150 const char *name = "unknown sym type name";
151 if (type < ARRAY_SIZE(type_name)) {
152 name = type_name[type];
153 }
154 return name;
155}
156
157static const char *sym_bind(unsigned bind)
158{
159 static const char *bind_name[] = {
160#define SYM_BIND(X) [X] = #X
161 SYM_BIND(STB_LOCAL),
162 SYM_BIND(STB_GLOBAL),
163 SYM_BIND(STB_WEAK),
164#undef SYM_BIND
165 };
166 const char *name = "unknown sym bind name";
167 if (bind < ARRAY_SIZE(bind_name)) {
168 name = bind_name[bind];
169 }
170 return name;
171}
172
173static const char *sym_visibility(unsigned visibility)
174{
175 static const char *visibility_name[] = {
176#define SYM_VISIBILITY(X) [X] = #X
177 SYM_VISIBILITY(STV_DEFAULT),
178 SYM_VISIBILITY(STV_INTERNAL),
179 SYM_VISIBILITY(STV_HIDDEN),
180 SYM_VISIBILITY(STV_PROTECTED),
181#undef SYM_VISIBILITY
182 };
183 const char *name = "unknown sym visibility name";
184 if (visibility < ARRAY_SIZE(visibility_name)) {
185 name = visibility_name[visibility];
186 }
187 return name;
188}
189
190static const char *rel_type(unsigned type)
191{
192 static const char *type_name[] = {
193#define REL_TYPE(X) [X] = #X
194#if ELF_BITS == 64
195 REL_TYPE(R_X86_64_NONE),
196 REL_TYPE(R_X86_64_64),
197 REL_TYPE(R_X86_64_PC32),
198 REL_TYPE(R_X86_64_GOT32),
199 REL_TYPE(R_X86_64_PLT32),
200 REL_TYPE(R_X86_64_COPY),
201 REL_TYPE(R_X86_64_GLOB_DAT),
202 REL_TYPE(R_X86_64_JUMP_SLOT),
203 REL_TYPE(R_X86_64_RELATIVE),
204 REL_TYPE(R_X86_64_GOTPCREL),
205 REL_TYPE(R_X86_64_32),
206 REL_TYPE(R_X86_64_32S),
207 REL_TYPE(R_X86_64_16),
208 REL_TYPE(R_X86_64_PC16),
209 REL_TYPE(R_X86_64_8),
210 REL_TYPE(R_X86_64_PC8),
211#else
212 REL_TYPE(R_386_NONE),
213 REL_TYPE(R_386_32),
214 REL_TYPE(R_386_PC32),
215 REL_TYPE(R_386_GOT32),
216 REL_TYPE(R_386_PLT32),
217 REL_TYPE(R_386_COPY),
218 REL_TYPE(R_386_GLOB_DAT),
219 REL_TYPE(R_386_JMP_SLOT),
220 REL_TYPE(R_386_RELATIVE),
221 REL_TYPE(R_386_GOTOFF),
222 REL_TYPE(R_386_GOTPC),
223 REL_TYPE(R_386_8),
224 REL_TYPE(R_386_PC8),
225 REL_TYPE(R_386_16),
226 REL_TYPE(R_386_PC16),
227#endif
228#undef REL_TYPE
229 };
230 const char *name = "unknown type rel type name";
231 if (type < ARRAY_SIZE(type_name) && type_name[type]) {
232 name = type_name[type];
233 }
234 return name;
235}
236
237static const char *sec_name(unsigned shndx)
238{
239 const char *sec_strtab;
240 const char *name;
241 sec_strtab = secs[ehdr.e_shstrndx].strtab;
242 name = "<noname>";
243 if (shndx < ehdr.e_shnum) {
244 name = sec_strtab + secs[shndx].shdr.sh_name;
245 }
246 else if (shndx == SHN_ABS) {
247 name = "ABSOLUTE";
248 }
249 else if (shndx == SHN_COMMON) {
250 name = "COMMON";
251 }
252 return name;
253}
254
255static const char *sym_name(const char *sym_strtab, Elf_Sym *sym)
256{
257 const char *name;
258 name = "<noname>";
259 if (sym->st_name) {
260 name = sym_strtab + sym->st_name;
261 }
262 else {
263 name = sec_name(sym->st_shndx);
264 }
265 return name;
266}
267
268static Elf_Sym *sym_lookup(const char *symname)
269{
270 int i;
271 for (i = 0; i < ehdr.e_shnum; i++) {
272 struct section *sec = &secs[i];
273 long nsyms;
274 char *strtab;
275 Elf_Sym *symtab;
276 Elf_Sym *sym;
277
278 if (sec->shdr.sh_type != SHT_SYMTAB)
279 continue;
280
281 nsyms = sec->shdr.sh_size/sizeof(Elf_Sym);
282 symtab = sec->symtab;
283 strtab = sec->link->strtab;
284
285 for (sym = symtab; --nsyms >= 0; sym++) {
286 if (!sym->st_name)
287 continue;
288 if (strcmp(symname, strtab + sym->st_name) == 0)
289 return sym;
290 }
291 }
292 return 0;
293}
294
295#if BYTE_ORDER == LITTLE_ENDIAN
296#define le16_to_cpu(val) (val)
297#define le32_to_cpu(val) (val)
298#define le64_to_cpu(val) (val)
299#endif
300#if BYTE_ORDER == BIG_ENDIAN
301#define le16_to_cpu(val) bswap_16(val)
302#define le32_to_cpu(val) bswap_32(val)
303#define le64_to_cpu(val) bswap_64(val)
304#endif
305
306static uint16_t elf16_to_cpu(uint16_t val)
307{
308 return le16_to_cpu(val);
309}
310
311static uint32_t elf32_to_cpu(uint32_t val)
312{
313 return le32_to_cpu(val);
314}
315
316#define elf_half_to_cpu(x) elf16_to_cpu(x)
317#define elf_word_to_cpu(x) elf32_to_cpu(x)
318
319#if ELF_BITS == 64
320static uint64_t elf64_to_cpu(uint64_t val)
321{
322 return le64_to_cpu(val);
323}
324#define elf_addr_to_cpu(x) elf64_to_cpu(x)
325#define elf_off_to_cpu(x) elf64_to_cpu(x)
326#define elf_xword_to_cpu(x) elf64_to_cpu(x)
327#else
328#define elf_addr_to_cpu(x) elf32_to_cpu(x)
329#define elf_off_to_cpu(x) elf32_to_cpu(x)
330#define elf_xword_to_cpu(x) elf32_to_cpu(x)
331#endif
332
333static void read_ehdr(FILE *fp)
334{
335 if (fread(&ehdr, sizeof(ehdr), 1, fp) != 1) {
336 die("Cannot read ELF header: %s\n",
337 strerror(errno));
338 }
339 if (memcmp(ehdr.e_ident, ELFMAG, SELFMAG) != 0) {
340 die("No ELF magic\n");
341 }
342 if (ehdr.e_ident[EI_CLASS] != ELF_CLASS) {
343 die("Not a %d bit executable\n", ELF_BITS);
344 }
345 if (ehdr.e_ident[EI_DATA] != ELFDATA2LSB) {
346 die("Not a LSB ELF executable\n");
347 }
348 if (ehdr.e_ident[EI_VERSION] != EV_CURRENT) {
349 die("Unknown ELF version\n");
350 }
351 /* Convert the fields to native endian */
352 ehdr.e_type = elf_half_to_cpu(ehdr.e_type);
353 ehdr.e_machine = elf_half_to_cpu(ehdr.e_machine);
354 ehdr.e_version = elf_word_to_cpu(ehdr.e_version);
355 ehdr.e_entry = elf_addr_to_cpu(ehdr.e_entry);
356 ehdr.e_phoff = elf_off_to_cpu(ehdr.e_phoff);
357 ehdr.e_shoff = elf_off_to_cpu(ehdr.e_shoff);
358 ehdr.e_flags = elf_word_to_cpu(ehdr.e_flags);
359 ehdr.e_ehsize = elf_half_to_cpu(ehdr.e_ehsize);
360 ehdr.e_phentsize = elf_half_to_cpu(ehdr.e_phentsize);
361 ehdr.e_phnum = elf_half_to_cpu(ehdr.e_phnum);
362 ehdr.e_shentsize = elf_half_to_cpu(ehdr.e_shentsize);
363 ehdr.e_shnum = elf_half_to_cpu(ehdr.e_shnum);
364 ehdr.e_shstrndx = elf_half_to_cpu(ehdr.e_shstrndx);
365
366 if ((ehdr.e_type != ET_EXEC) && (ehdr.e_type != ET_DYN)) {
367 die("Unsupported ELF header type\n");
368 }
369 if (ehdr.e_machine != ELF_MACHINE) {
370 die("Not for %s\n", ELF_MACHINE_NAME);
371 }
372 if (ehdr.e_version != EV_CURRENT) {
373 die("Unknown ELF version\n");
374 }
375 if (ehdr.e_ehsize != sizeof(Elf_Ehdr)) {
376 die("Bad Elf header size\n");
377 }
378 if (ehdr.e_phentsize != sizeof(Elf_Phdr)) {
379 die("Bad program header entry\n");
380 }
381 if (ehdr.e_shentsize != sizeof(Elf_Shdr)) {
382 die("Bad section header entry\n");
383 }
384 if (ehdr.e_shstrndx >= ehdr.e_shnum) {
385 die("String table index out of bounds\n");
386 }
387}
388
389static void read_shdrs(FILE *fp)
390{
391 int i;
392 Elf_Shdr shdr;
393
394 secs = calloc(ehdr.e_shnum, sizeof(struct section));
395 if (!secs) {
396 die("Unable to allocate %d section headers\n",
397 ehdr.e_shnum);
398 }
399 if (fseek(fp, ehdr.e_shoff, SEEK_SET) < 0) {
400 die("Seek to %d failed: %s\n",
401 ehdr.e_shoff, strerror(errno));
402 }
403 for (i = 0; i < ehdr.e_shnum; i++) {
404 struct section *sec = &secs[i];
405 if (fread(&shdr, sizeof shdr, 1, fp) != 1)
406 die("Cannot read ELF section headers %d/%d: %s\n",
407 i, ehdr.e_shnum, strerror(errno));
408 sec->shdr.sh_name = elf_word_to_cpu(shdr.sh_name);
409 sec->shdr.sh_type = elf_word_to_cpu(shdr.sh_type);
410 sec->shdr.sh_flags = elf_xword_to_cpu(shdr.sh_flags);
411 sec->shdr.sh_addr = elf_addr_to_cpu(shdr.sh_addr);
412 sec->shdr.sh_offset = elf_off_to_cpu(shdr.sh_offset);
413 sec->shdr.sh_size = elf_xword_to_cpu(shdr.sh_size);
414 sec->shdr.sh_link = elf_word_to_cpu(shdr.sh_link);
415 sec->shdr.sh_info = elf_word_to_cpu(shdr.sh_info);
416 sec->shdr.sh_addralign = elf_xword_to_cpu(shdr.sh_addralign);
417 sec->shdr.sh_entsize = elf_xword_to_cpu(shdr.sh_entsize);
418 if (sec->shdr.sh_link < ehdr.e_shnum)
419 sec->link = &secs[sec->shdr.sh_link];
420 }
421
422}
423
424static void read_strtabs(FILE *fp)
425{
426 int i;
427 for (i = 0; i < ehdr.e_shnum; i++) {
428 struct section *sec = &secs[i];
429 if (sec->shdr.sh_type != SHT_STRTAB) {
430 continue;
431 }
432 sec->strtab = malloc(sec->shdr.sh_size);
433 if (!sec->strtab) {
434 die("malloc of %d bytes for strtab failed\n",
435 sec->shdr.sh_size);
436 }
437 if (fseek(fp, sec->shdr.sh_offset, SEEK_SET) < 0) {
438 die("Seek to %d failed: %s\n",
439 sec->shdr.sh_offset, strerror(errno));
440 }
441 if (fread(sec->strtab, 1, sec->shdr.sh_size, fp)
442 != sec->shdr.sh_size) {
443 die("Cannot read symbol table: %s\n",
444 strerror(errno));
445 }
446 }
447}
448
449static void read_symtabs(FILE *fp)
450{
451 int i,j;
452 for (i = 0; i < ehdr.e_shnum; i++) {
453 struct section *sec = &secs[i];
454 if (sec->shdr.sh_type != SHT_SYMTAB) {
455 continue;
456 }
457 sec->symtab = malloc(sec->shdr.sh_size);
458 if (!sec->symtab) {
459 die("malloc of %d bytes for symtab failed\n",
460 sec->shdr.sh_size);
461 }
462 if (fseek(fp, sec->shdr.sh_offset, SEEK_SET) < 0) {
463 die("Seek to %d failed: %s\n",
464 sec->shdr.sh_offset, strerror(errno));
465 }
466 if (fread(sec->symtab, 1, sec->shdr.sh_size, fp)
467 != sec->shdr.sh_size) {
468 die("Cannot read symbol table: %s\n",
469 strerror(errno));
470 }
471 for (j = 0; j < sec->shdr.sh_size/sizeof(Elf_Sym); j++) {
472 Elf_Sym *sym = &sec->symtab[j];
473 sym->st_name = elf_word_to_cpu(sym->st_name);
474 sym->st_value = elf_addr_to_cpu(sym->st_value);
475 sym->st_size = elf_xword_to_cpu(sym->st_size);
476 sym->st_shndx = elf_half_to_cpu(sym->st_shndx);
477 }
478 }
479}
480
481
482static void read_relocs(FILE *fp)
483{
484 int i,j;
485 for (i = 0; i < ehdr.e_shnum; i++) {
486 struct section *sec = &secs[i];
487 if (sec->shdr.sh_type != SHT_REL_TYPE) {
488 continue;
489 }
490 sec->reltab = malloc(sec->shdr.sh_size);
491 if (!sec->reltab) {
492 die("malloc of %d bytes for relocs failed\n",
493 sec->shdr.sh_size);
494 }
495 if (fseek(fp, sec->shdr.sh_offset, SEEK_SET) < 0) {
496 die("Seek to %d failed: %s\n",
497 sec->shdr.sh_offset, strerror(errno));
498 }
499 if (fread(sec->reltab, 1, sec->shdr.sh_size, fp)
500 != sec->shdr.sh_size) {
501 die("Cannot read symbol table: %s\n",
502 strerror(errno));
503 }
504 for (j = 0; j < sec->shdr.sh_size/sizeof(Elf_Rel); j++) {
505 Elf_Rel *rel = &sec->reltab[j];
506 rel->r_offset = elf_addr_to_cpu(rel->r_offset);
507 rel->r_info = elf_xword_to_cpu(rel->r_info);
508#if (SHT_REL_TYPE == SHT_RELA)
509 rel->r_addend = elf_xword_to_cpu(rel->r_addend);
510#endif
511 }
512 }
513}
514
515
516static void print_absolute_symbols(void)
517{
518 int i;
519 const char *format;
520
521 if (ELF_BITS == 64)
522 format = "%5d %016"PRIx64" %5"PRId64" %10s %10s %12s %s\n";
523 else
524 format = "%5d %08"PRIx32" %5"PRId32" %10s %10s %12s %s\n";
525
526 printf("Absolute symbols\n");
527 printf(" Num: Value Size Type Bind Visibility Name\n");
528 for (i = 0; i < ehdr.e_shnum; i++) {
529 struct section *sec = &secs[i];
530 char *sym_strtab;
531 int j;
532
533 if (sec->shdr.sh_type != SHT_SYMTAB) {
534 continue;
535 }
536 sym_strtab = sec->link->strtab;
537 for (j = 0; j < sec->shdr.sh_size/sizeof(Elf_Sym); j++) {
538 Elf_Sym *sym;
539 const char *name;
540 sym = &sec->symtab[j];
541 name = sym_name(sym_strtab, sym);
542 if (sym->st_shndx != SHN_ABS) {
543 continue;
544 }
545 printf(format,
546 j, sym->st_value, sym->st_size,
547 sym_type(ELF_ST_TYPE(sym->st_info)),
548 sym_bind(ELF_ST_BIND(sym->st_info)),
549 sym_visibility(ELF_ST_VISIBILITY(sym->st_other)),
550 name);
551 }
552 }
553 printf("\n");
554}
555
556static void print_absolute_relocs(void)
557{
558 int i, printed = 0;
559 const char *format;
560
561 if (ELF_BITS == 64)
562 format = "%016"PRIx64" %016"PRIx64" %10s %016"PRIx64" %s\n";
563 else
564 format = "%08"PRIx32" %08"PRIx32" %10s %08"PRIx32" %s\n";
565
566 for (i = 0; i < ehdr.e_shnum; i++) {
567 struct section *sec = &secs[i];
568 struct section *sec_applies, *sec_symtab;
569 char *sym_strtab;
570 Elf_Sym *sh_symtab;
571 int j;
572 if (sec->shdr.sh_type != SHT_REL_TYPE) {
573 continue;
574 }
575 sec_symtab = sec->link;
576 sec_applies = &secs[sec->shdr.sh_info];
577 if (!(sec_applies->shdr.sh_flags & SHF_ALLOC)) {
578 continue;
579 }
580 sh_symtab = sec_symtab->symtab;
581 sym_strtab = sec_symtab->link->strtab;
582 for (j = 0; j < sec->shdr.sh_size/sizeof(Elf_Rel); j++) {
583 Elf_Rel *rel;
584 Elf_Sym *sym;
585 const char *name;
586 rel = &sec->reltab[j];
587 sym = &sh_symtab[ELF_R_SYM(rel->r_info)];
588 name = sym_name(sym_strtab, sym);
589 if (sym->st_shndx != SHN_ABS) {
590 continue;
591 }
592
593 /* Absolute symbols are not relocated if bzImage is
594 * loaded at a non-compiled address. Display a warning
595 * to user at compile time about the absolute
596 * relocations present.
597 *
598 * User need to audit the code to make sure
599 * some symbols which should have been section
600 * relative have not become absolute because of some
601 * linker optimization or wrong programming usage.
602 *
603 * Before warning check if this absolute symbol
604 * relocation is harmless.
605 */
606 if (is_reloc(S_ABS, name) || is_reloc(S_REL, name))
607 continue;
608
609 if (!printed) {
610 printf("WARNING: Absolute relocations"
611 " present\n");
612 printf("Offset Info Type Sym.Value "
613 "Sym.Name\n");
614 printed = 1;
615 }
616
617 printf(format,
618 rel->r_offset,
619 rel->r_info,
620 rel_type(ELF_R_TYPE(rel->r_info)),
621 sym->st_value,
622 name);
623 }
624 }
625
626 if (printed)
627 printf("\n");
628}
629
630static void add_reloc(struct relocs *r, uint32_t offset)
631{
632 if (r->count == r->size) {
633 unsigned long newsize = r->size + 50000;
634 void *mem = realloc(r->offset, newsize * sizeof(r->offset[0]));
635
636 if (!mem)
637 die("realloc of %ld entries for relocs failed\n",
638 newsize);
639 r->offset = mem;
640 r->size = newsize;
641 }
642 r->offset[r->count++] = offset;
643}
644
645static void walk_relocs(int (*process)(struct section *sec, Elf_Rel *rel,
646 Elf_Sym *sym, const char *symname))
647{
648 int i;
649 /* Walk through the relocations */
650 for (i = 0; i < ehdr.e_shnum; i++) {
651 char *sym_strtab;
652 Elf_Sym *sh_symtab;
653 struct section *sec_applies, *sec_symtab;
654 int j;
655 struct section *sec = &secs[i];
656
657 if (sec->shdr.sh_type != SHT_REL_TYPE) {
658 continue;
659 }
660 sec_symtab = sec->link;
661 sec_applies = &secs[sec->shdr.sh_info];
662 if (!(sec_applies->shdr.sh_flags & SHF_ALLOC)) {
663 continue;
664 }
665 sh_symtab = sec_symtab->symtab;
666 sym_strtab = sec_symtab->link->strtab;
667 for (j = 0; j < sec->shdr.sh_size/sizeof(Elf_Rel); j++) {
668 Elf_Rel *rel = &sec->reltab[j];
669 Elf_Sym *sym = &sh_symtab[ELF_R_SYM(rel->r_info)];
670 const char *symname = sym_name(sym_strtab, sym);
671
672 process(sec, rel, sym, symname);
673 }
674 }
675}
676
677/*
678 * The .data..percpu section is a special case for x86_64 SMP kernels.
679 * It is used to initialize the actual per_cpu areas and to provide
680 * definitions for the per_cpu variables that correspond to their offsets
681 * within the percpu area. Since the values of all of the symbols need
682 * to be offsets from the start of the per_cpu area the virtual address
683 * (sh_addr) of .data..percpu is 0 in SMP kernels.
684 *
685 * This means that:
686 *
687 * Relocations that reference symbols in the per_cpu area do not
688 * need further relocation (since the value is an offset relative
689 * to the start of the per_cpu area that does not change).
690 *
691 * Relocations that apply to the per_cpu area need to have their
692 * offset adjusted by by the value of __per_cpu_load to make them
693 * point to the correct place in the loaded image (because the
694 * virtual address of .data..percpu is 0).
695 *
696 * For non SMP kernels .data..percpu is linked as part of the normal
697 * kernel data and does not require special treatment.
698 *
699 */
700static int per_cpu_shndx = -1;
701static Elf_Addr per_cpu_load_addr;
702
703static void percpu_init(void)
704{
705 int i;
706 for (i = 0; i < ehdr.e_shnum; i++) {
707 ElfW(Sym) *sym;
708 if (strcmp(sec_name(i), ".data..percpu"))
709 continue;
710
711 if (secs[i].shdr.sh_addr != 0) /* non SMP kernel */
712 return;
713
714 sym = sym_lookup("__per_cpu_load");
715 if (!sym)
716 die("can't find __per_cpu_load\n");
717
718 per_cpu_shndx = i;
719 per_cpu_load_addr = sym->st_value;
720 return;
721 }
722}
723
724#if ELF_BITS == 64
725
726/*
727 * Check to see if a symbol lies in the .data..percpu section.
728 *
729 * The linker incorrectly associates some symbols with the
730 * .data..percpu section so we also need to check the symbol
731 * name to make sure that we classify the symbol correctly.
732 *
733 * The GNU linker incorrectly associates:
734 * __init_begin
735 * __per_cpu_load
736 *
737 * The "gold" linker incorrectly associates:
738 * init_per_cpu__irq_stack_union
739 * init_per_cpu__gdt_page
740 */
741static int is_percpu_sym(ElfW(Sym) *sym, const char *symname)
742{
743 return (sym->st_shndx == per_cpu_shndx) &&
744 strcmp(symname, "__init_begin") &&
745 strcmp(symname, "__per_cpu_load") &&
746 strncmp(symname, "init_per_cpu_", 13);
747}
748
749
750static int do_reloc64(struct section *sec, Elf_Rel *rel, ElfW(Sym) *sym,
751 const char *symname)
752{
753 unsigned r_type = ELF64_R_TYPE(rel->r_info);
754 ElfW(Addr) offset = rel->r_offset;
755 int shn_abs = (sym->st_shndx == SHN_ABS) && !is_reloc(S_REL, symname);
756
757 if (sym->st_shndx == SHN_UNDEF)
758 return 0;
759
760 /*
761 * Adjust the offset if this reloc applies to the percpu section.
762 */
763 if (sec->shdr.sh_info == per_cpu_shndx)
764 offset += per_cpu_load_addr;
765
766 switch (r_type) {
767 case R_X86_64_NONE:
768 /* NONE can be ignored. */
769 break;
770
771 case R_X86_64_PC32:
772 /*
773 * PC relative relocations don't need to be adjusted unless
774 * referencing a percpu symbol.
775 */
776 if (is_percpu_sym(sym, symname))
777 add_reloc(&relocs32neg, offset);
778 break;
779
780 case R_X86_64_32:
781 case R_X86_64_32S:
782 case R_X86_64_64:
783 /*
784 * References to the percpu area don't need to be adjusted.
785 */
786 if (is_percpu_sym(sym, symname))
787 break;
788
789 if (shn_abs) {
790 /*
791 * Whitelisted absolute symbols do not require
792 * relocation.
793 */
794 if (is_reloc(S_ABS, symname))
795 break;
796
797 die("Invalid absolute %s relocation: %s\n",
798 rel_type(r_type), symname);
799 break;
800 }
801
802 /*
803 * Relocation offsets for 64 bit kernels are output
804 * as 32 bits and sign extended back to 64 bits when
805 * the relocations are processed.
806 * Make sure that the offset will fit.
807 */
808 if ((int32_t)offset != (int64_t)offset)
809 die("Relocation offset doesn't fit in 32 bits\n");
810
811 if (r_type == R_X86_64_64)
812 add_reloc(&relocs64, offset);
813 else
814 add_reloc(&relocs32, offset);
815 break;
816
817 default:
818 die("Unsupported relocation type: %s (%d)\n",
819 rel_type(r_type), r_type);
820 break;
821 }
822
823 return 0;
824}
825
826#else
827
828static int do_reloc32(struct section *sec, Elf_Rel *rel, Elf_Sym *sym,
829 const char *symname)
830{
831 unsigned r_type = ELF32_R_TYPE(rel->r_info);
832 int shn_abs = (sym->st_shndx == SHN_ABS) && !is_reloc(S_REL, symname);
833
834 switch (r_type) {
835 case R_386_NONE:
836 case R_386_PC32:
837 case R_386_PC16:
838 case R_386_PC8:
839 /*
840 * NONE can be ignored and PC relative relocations don't
841 * need to be adjusted.
842 */
843 break;
844
845 case R_386_32:
846 if (shn_abs) {
847 /*
848 * Whitelisted absolute symbols do not require
849 * relocation.
850 */
851 if (is_reloc(S_ABS, symname))
852 break;
853
854 die("Invalid absolute %s relocation: %s\n",
855 rel_type(r_type), symname);
856 break;
857 }
858
859 add_reloc(&relocs32, rel->r_offset);
860 break;
861
862 default:
863 die("Unsupported relocation type: %s (%d)\n",
864 rel_type(r_type), r_type);
865 break;
866 }
867
868 return 0;
869}
870
871static int do_reloc_real(struct section *sec, Elf_Rel *rel, Elf_Sym *sym,
872 const char *symname)
873{
874 unsigned r_type = ELF32_R_TYPE(rel->r_info);
875 int shn_abs = (sym->st_shndx == SHN_ABS) && !is_reloc(S_REL, symname);
876
877 switch (r_type) {
878 case R_386_NONE:
879 case R_386_PC32:
880 case R_386_PC16:
881 case R_386_PC8:
882 /*
883 * NONE can be ignored and PC relative relocations don't
884 * need to be adjusted.
885 */
886 break;
887
888 case R_386_16:
889 if (shn_abs) {
890 /*
891 * Whitelisted absolute symbols do not require
892 * relocation.
893 */
894 if (is_reloc(S_ABS, symname))
895 break;
896
897 if (is_reloc(S_SEG, symname)) {
898 add_reloc(&relocs16, rel->r_offset);
899 break;
900 }
901 } else {
902 if (!is_reloc(S_LIN, symname))
903 break;
904 }
905 die("Invalid %s %s relocation: %s\n",
906 shn_abs ? "absolute" : "relative",
907 rel_type(r_type), symname);
908 break;
909
910 case R_386_32:
911 if (shn_abs) {
912 /*
913 * Whitelisted absolute symbols do not require
914 * relocation.
915 */
916 if (is_reloc(S_ABS, symname))
917 break;
918
919 if (is_reloc(S_REL, symname)) {
920 add_reloc(&relocs32, rel->r_offset);
921 break;
922 }
923 } else {
924 if (is_reloc(S_LIN, symname))
925 add_reloc(&relocs32, rel->r_offset);
926 break;
927 }
928 die("Invalid %s %s relocation: %s\n",
929 shn_abs ? "absolute" : "relative",
930 rel_type(r_type), symname);
931 break;
932
933 default:
934 die("Unsupported relocation type: %s (%d)\n",
935 rel_type(r_type), r_type);
936 break;
937 }
938
939 return 0;
940}
941
942#endif
943
944static int cmp_relocs(const void *va, const void *vb)
945{
946 const uint32_t *a, *b;
947 a = va; b = vb;
948 return (*a == *b)? 0 : (*a > *b)? 1 : -1;
949}
950
951static void sort_relocs(struct relocs *r)
952{
953 qsort(r->offset, r->count, sizeof(r->offset[0]), cmp_relocs);
954}
955
956static int write32(uint32_t v, FILE *f)
957{
958 unsigned char buf[4];
959
960 put_unaligned_le32(v, buf);
961 return fwrite(buf, 1, 4, f) == 4 ? 0 : -1;
962}
963
964static int write32_as_text(uint32_t v, FILE *f)
965{
966 return fprintf(f, "\t.long 0x%08"PRIx32"\n", v) > 0 ? 0 : -1;
967}
968
969static void emit_relocs(int as_text, int use_real_mode)
970{
971 int i;
972 int (*write_reloc)(uint32_t, FILE *) = write32;
973 int (*do_reloc)(struct section *sec, Elf_Rel *rel, Elf_Sym *sym,
974 const char *symname);
975
976#if ELF_BITS == 64
977 if (!use_real_mode)
978 do_reloc = do_reloc64;
979 else
980 die("--realmode not valid for a 64-bit ELF file");
981#else
982 if (!use_real_mode)
983 do_reloc = do_reloc32;
984 else
985 do_reloc = do_reloc_real;
986#endif
987
988 /* Collect up the relocations */
989 walk_relocs(do_reloc);
990
991 if (relocs16.count && !use_real_mode)
992 die("Segment relocations found but --realmode not specified\n");
993
994 /* Order the relocations for more efficient processing */
995 sort_relocs(&relocs16);
996 sort_relocs(&relocs32);
997#if ELF_BITS == 64
998 sort_relocs(&relocs32neg);
999 sort_relocs(&relocs64);
1000#endif
1001
1002 /* Print the relocations */
1003 if (as_text) {
1004 /* Print the relocations in a form suitable that
1005 * gas will like.
1006 */
1007 printf(".section \".data.reloc\",\"a\"\n");
1008 printf(".balign 4\n");
1009 write_reloc = write32_as_text;
1010 }
1011
1012 if (use_real_mode) {
1013 write_reloc(relocs16.count, stdout);
1014 for (i = 0; i < relocs16.count; i++)
1015 write_reloc(relocs16.offset[i], stdout);
1016
1017 write_reloc(relocs32.count, stdout);
1018 for (i = 0; i < relocs32.count; i++)
1019 write_reloc(relocs32.offset[i], stdout);
1020 } else {
1021#if ELF_BITS == 64
1022 /* Print a stop */
1023 write_reloc(0, stdout);
1024
1025 /* Now print each relocation */
1026 for (i = 0; i < relocs64.count; i++)
1027 write_reloc(relocs64.offset[i], stdout);
1028
1029 /* Print a stop */
1030 write_reloc(0, stdout);
1031
1032 /* Now print each inverse 32-bit relocation */
1033 for (i = 0; i < relocs32neg.count; i++)
1034 write_reloc(relocs32neg.offset[i], stdout);
1035#endif
1036
1037 /* Print a stop */
1038 write_reloc(0, stdout);
1039
1040 /* Now print each relocation */
1041 for (i = 0; i < relocs32.count; i++)
1042 write_reloc(relocs32.offset[i], stdout);
1043 }
1044}
1045
1046/*
1047 * As an aid to debugging problems with different linkers
1048 * print summary information about the relocs.
1049 * Since different linkers tend to emit the sections in
1050 * different orders we use the section names in the output.
1051 */
1052static int do_reloc_info(struct section *sec, Elf_Rel *rel, ElfW(Sym) *sym,
1053 const char *symname)
1054{
1055 printf("%s\t%s\t%s\t%s\n",
1056 sec_name(sec->shdr.sh_info),
1057 rel_type(ELF_R_TYPE(rel->r_info)),
1058 symname,
1059 sec_name(sym->st_shndx));
1060 return 0;
1061}
1062
1063static void print_reloc_info(void)
1064{
1065 printf("reloc section\treloc type\tsymbol\tsymbol section\n");
1066 walk_relocs(do_reloc_info);
1067}
1068
1069#if ELF_BITS == 64
1070# define process process_64
1071#else
1072# define process process_32
1073#endif
1074
1075void process(FILE *fp, int use_real_mode, int as_text,
1076 int show_absolute_syms, int show_absolute_relocs,
1077 int show_reloc_info)
1078{
1079 regex_init(use_real_mode);
1080 read_ehdr(fp);
1081 read_shdrs(fp);
1082 read_strtabs(fp);
1083 read_symtabs(fp);
1084 read_relocs(fp);
1085 if (ELF_BITS == 64)
1086 percpu_init();
1087 if (show_absolute_syms) {
1088 print_absolute_symbols();
1089 return;
1090 }
1091 if (show_absolute_relocs) {
1092 print_absolute_relocs();
1093 return;
1094 }
1095 if (show_reloc_info) {
1096 print_reloc_info();
1097 return;
1098 }
1099 emit_relocs(as_text, use_real_mode);
1100}