1 /* This is included from relocs_32/64.c */
3 #define ElfW(type) _ElfW(ELF_BITS, type)
4 #define _ElfW(bits, type) __ElfW(bits, type)
5 #define __ElfW(bits, type) Elf##bits##_##type
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)
21 static struct relocs relocs16;
22 static struct relocs relocs32;
23 static struct relocs relocs64;
32 static struct section *secs;
34 static const char * const sym_regex_kernel[S_NSYMTYPES] = {
36 * Following symbols have been audited. There values are constant and do
37 * not change if bzImage is loaded at a different physical address than
38 * the address for which it has been compiled. Don't warn user about
39 * absolute relocations present w.r.t these symbols.
42 "^(xen_irq_disable_direct_reloc$|"
43 "xen_save_fl_direct_reloc$|"
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.)
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|"
70 "(jiffies|jiffies_64)|"
74 "__end_rodata_hpage_align|"
80 static const char * const sym_regex_realmode[S_NSYMTYPES] = {
82 * These symbols are known to be relative, even if the linker marks them
83 * as absolute (typically defined outside any section in the linker script.)
89 * These are 16-bit segment symbols when compiling 16-bit code.
95 * These are offsets belonging to segments, as opposed to linear addresses,
96 * when compiling 16-bit code.
102 static const char * const *sym_regex;
104 static regex_t sym_regex_c[S_NSYMTYPES];
105 static int is_reloc(enum symtype type, const char *sym_name)
107 return sym_regex[type] &&
108 !regexec(&sym_regex_c[type], sym_name, 0, NULL, 0);
111 static void regex_init(int use_real_mode)
118 sym_regex = sym_regex_realmode;
120 sym_regex = sym_regex_kernel;
122 for (i = 0; i < S_NSYMTYPES; i++) {
126 err = regcomp(&sym_regex_c[i], sym_regex[i],
127 REG_EXTENDED|REG_NOSUB);
130 regerror(err, &sym_regex_c[i], errbuf, sizeof errbuf);
136 static const char *sym_type(unsigned type)
138 static const char *type_name[] = {
139 #define SYM_TYPE(X) [X] = #X
140 SYM_TYPE(STT_NOTYPE),
141 SYM_TYPE(STT_OBJECT),
143 SYM_TYPE(STT_SECTION),
145 SYM_TYPE(STT_COMMON),
149 const char *name = "unknown sym type name";
150 if (type < ARRAY_SIZE(type_name)) {
151 name = type_name[type];
156 static const char *sym_bind(unsigned bind)
158 static const char *bind_name[] = {
159 #define SYM_BIND(X) [X] = #X
161 SYM_BIND(STB_GLOBAL),
165 const char *name = "unknown sym bind name";
166 if (bind < ARRAY_SIZE(bind_name)) {
167 name = bind_name[bind];
172 static const char *sym_visibility(unsigned visibility)
174 static const char *visibility_name[] = {
175 #define SYM_VISIBILITY(X) [X] = #X
176 SYM_VISIBILITY(STV_DEFAULT),
177 SYM_VISIBILITY(STV_INTERNAL),
178 SYM_VISIBILITY(STV_HIDDEN),
179 SYM_VISIBILITY(STV_PROTECTED),
180 #undef SYM_VISIBILITY
182 const char *name = "unknown sym visibility name";
183 if (visibility < ARRAY_SIZE(visibility_name)) {
184 name = visibility_name[visibility];
189 static const char *rel_type(unsigned type)
191 static const char *type_name[] = {
192 #define REL_TYPE(X) [X] = #X
194 REL_TYPE(R_X86_64_NONE),
195 REL_TYPE(R_X86_64_64),
196 REL_TYPE(R_X86_64_PC32),
197 REL_TYPE(R_X86_64_GOT32),
198 REL_TYPE(R_X86_64_PLT32),
199 REL_TYPE(R_X86_64_COPY),
200 REL_TYPE(R_X86_64_GLOB_DAT),
201 REL_TYPE(R_X86_64_JUMP_SLOT),
202 REL_TYPE(R_X86_64_RELATIVE),
203 REL_TYPE(R_X86_64_GOTPCREL),
204 REL_TYPE(R_X86_64_32),
205 REL_TYPE(R_X86_64_32S),
206 REL_TYPE(R_X86_64_16),
207 REL_TYPE(R_X86_64_PC16),
208 REL_TYPE(R_X86_64_8),
209 REL_TYPE(R_X86_64_PC8),
211 REL_TYPE(R_386_NONE),
213 REL_TYPE(R_386_PC32),
214 REL_TYPE(R_386_GOT32),
215 REL_TYPE(R_386_PLT32),
216 REL_TYPE(R_386_COPY),
217 REL_TYPE(R_386_GLOB_DAT),
218 REL_TYPE(R_386_JMP_SLOT),
219 REL_TYPE(R_386_RELATIVE),
220 REL_TYPE(R_386_GOTOFF),
221 REL_TYPE(R_386_GOTPC),
225 REL_TYPE(R_386_PC16),
229 const char *name = "unknown type rel type name";
230 if (type < ARRAY_SIZE(type_name) && type_name[type]) {
231 name = type_name[type];
236 static const char *sec_name(unsigned shndx)
238 const char *sec_strtab;
240 sec_strtab = secs[ehdr.e_shstrndx].strtab;
242 if (shndx < ehdr.e_shnum) {
243 name = sec_strtab + secs[shndx].shdr.sh_name;
245 else if (shndx == SHN_ABS) {
248 else if (shndx == SHN_COMMON) {
254 static const char *sym_name(const char *sym_strtab, Elf_Sym *sym)
259 name = sym_strtab + sym->st_name;
262 name = sec_name(sym->st_shndx);
267 static Elf_Sym *sym_lookup(const char *symname)
270 for (i = 0; i < ehdr.e_shnum; i++) {
271 struct section *sec = &secs[i];
277 if (sec->shdr.sh_type != SHT_SYMTAB)
280 nsyms = sec->shdr.sh_size/sizeof(Elf_Sym);
281 symtab = sec->symtab;
282 strtab = sec->link->strtab;
284 for (sym = symtab; --nsyms >= 0; sym++) {
287 if (strcmp(symname, strtab + sym->st_name) == 0)
294 #if BYTE_ORDER == LITTLE_ENDIAN
295 #define le16_to_cpu(val) (val)
296 #define le32_to_cpu(val) (val)
297 #define le64_to_cpu(val) (val)
299 #if BYTE_ORDER == BIG_ENDIAN
300 #define le16_to_cpu(val) bswap_16(val)
301 #define le32_to_cpu(val) bswap_32(val)
302 #define le64_to_cpu(val) bswap_64(val)
305 static uint16_t elf16_to_cpu(uint16_t val)
307 return le16_to_cpu(val);
310 static uint32_t elf32_to_cpu(uint32_t val)
312 return le32_to_cpu(val);
315 #define elf_half_to_cpu(x) elf16_to_cpu(x)
316 #define elf_word_to_cpu(x) elf32_to_cpu(x)
319 static uint64_t elf64_to_cpu(uint64_t val)
321 return le64_to_cpu(val);
323 #define elf_addr_to_cpu(x) elf64_to_cpu(x)
324 #define elf_off_to_cpu(x) elf64_to_cpu(x)
325 #define elf_xword_to_cpu(x) elf64_to_cpu(x)
327 #define elf_addr_to_cpu(x) elf32_to_cpu(x)
328 #define elf_off_to_cpu(x) elf32_to_cpu(x)
329 #define elf_xword_to_cpu(x) elf32_to_cpu(x)
332 static void read_ehdr(FILE *fp)
334 if (fread(&ehdr, sizeof(ehdr), 1, fp) != 1) {
335 die("Cannot read ELF header: %s\n",
338 if (memcmp(ehdr.e_ident, ELFMAG, SELFMAG) != 0) {
339 die("No ELF magic\n");
341 if (ehdr.e_ident[EI_CLASS] != ELF_CLASS) {
342 die("Not a %d bit executable\n", ELF_BITS);
344 if (ehdr.e_ident[EI_DATA] != ELFDATA2LSB) {
345 die("Not a LSB ELF executable\n");
347 if (ehdr.e_ident[EI_VERSION] != EV_CURRENT) {
348 die("Unknown ELF version\n");
350 /* Convert the fields to native endian */
351 ehdr.e_type = elf_half_to_cpu(ehdr.e_type);
352 ehdr.e_machine = elf_half_to_cpu(ehdr.e_machine);
353 ehdr.e_version = elf_word_to_cpu(ehdr.e_version);
354 ehdr.e_entry = elf_addr_to_cpu(ehdr.e_entry);
355 ehdr.e_phoff = elf_off_to_cpu(ehdr.e_phoff);
356 ehdr.e_shoff = elf_off_to_cpu(ehdr.e_shoff);
357 ehdr.e_flags = elf_word_to_cpu(ehdr.e_flags);
358 ehdr.e_ehsize = elf_half_to_cpu(ehdr.e_ehsize);
359 ehdr.e_phentsize = elf_half_to_cpu(ehdr.e_phentsize);
360 ehdr.e_phnum = elf_half_to_cpu(ehdr.e_phnum);
361 ehdr.e_shentsize = elf_half_to_cpu(ehdr.e_shentsize);
362 ehdr.e_shnum = elf_half_to_cpu(ehdr.e_shnum);
363 ehdr.e_shstrndx = elf_half_to_cpu(ehdr.e_shstrndx);
365 if ((ehdr.e_type != ET_EXEC) && (ehdr.e_type != ET_DYN)) {
366 die("Unsupported ELF header type\n");
368 if (ehdr.e_machine != ELF_MACHINE) {
369 die("Not for %s\n", ELF_MACHINE_NAME);
371 if (ehdr.e_version != EV_CURRENT) {
372 die("Unknown ELF version\n");
374 if (ehdr.e_ehsize != sizeof(Elf_Ehdr)) {
375 die("Bad Elf header size\n");
377 if (ehdr.e_phentsize != sizeof(Elf_Phdr)) {
378 die("Bad program header entry\n");
380 if (ehdr.e_shentsize != sizeof(Elf_Shdr)) {
381 die("Bad section header entry\n");
383 if (ehdr.e_shstrndx >= ehdr.e_shnum) {
384 die("String table index out of bounds\n");
388 static void read_shdrs(FILE *fp)
393 secs = calloc(ehdr.e_shnum, sizeof(struct section));
395 die("Unable to allocate %d section headers\n",
398 if (fseek(fp, ehdr.e_shoff, SEEK_SET) < 0) {
399 die("Seek to %d failed: %s\n",
400 ehdr.e_shoff, strerror(errno));
402 for (i = 0; i < ehdr.e_shnum; i++) {
403 struct section *sec = &secs[i];
404 if (fread(&shdr, sizeof shdr, 1, fp) != 1)
405 die("Cannot read ELF section headers %d/%d: %s\n",
406 i, ehdr.e_shnum, strerror(errno));
407 sec->shdr.sh_name = elf_word_to_cpu(shdr.sh_name);
408 sec->shdr.sh_type = elf_word_to_cpu(shdr.sh_type);
409 sec->shdr.sh_flags = elf_xword_to_cpu(shdr.sh_flags);
410 sec->shdr.sh_addr = elf_addr_to_cpu(shdr.sh_addr);
411 sec->shdr.sh_offset = elf_off_to_cpu(shdr.sh_offset);
412 sec->shdr.sh_size = elf_xword_to_cpu(shdr.sh_size);
413 sec->shdr.sh_link = elf_word_to_cpu(shdr.sh_link);
414 sec->shdr.sh_info = elf_word_to_cpu(shdr.sh_info);
415 sec->shdr.sh_addralign = elf_xword_to_cpu(shdr.sh_addralign);
416 sec->shdr.sh_entsize = elf_xword_to_cpu(shdr.sh_entsize);
417 if (sec->shdr.sh_link < ehdr.e_shnum)
418 sec->link = &secs[sec->shdr.sh_link];
423 static void read_strtabs(FILE *fp)
426 for (i = 0; i < ehdr.e_shnum; i++) {
427 struct section *sec = &secs[i];
428 if (sec->shdr.sh_type != SHT_STRTAB) {
431 sec->strtab = malloc(sec->shdr.sh_size);
433 die("malloc of %d bytes for strtab failed\n",
436 if (fseek(fp, sec->shdr.sh_offset, SEEK_SET) < 0) {
437 die("Seek to %d failed: %s\n",
438 sec->shdr.sh_offset, strerror(errno));
440 if (fread(sec->strtab, 1, sec->shdr.sh_size, fp)
441 != sec->shdr.sh_size) {
442 die("Cannot read symbol table: %s\n",
448 static void read_symtabs(FILE *fp)
451 for (i = 0; i < ehdr.e_shnum; i++) {
452 struct section *sec = &secs[i];
453 if (sec->shdr.sh_type != SHT_SYMTAB) {
456 sec->symtab = malloc(sec->shdr.sh_size);
458 die("malloc of %d bytes for symtab failed\n",
461 if (fseek(fp, sec->shdr.sh_offset, SEEK_SET) < 0) {
462 die("Seek to %d failed: %s\n",
463 sec->shdr.sh_offset, strerror(errno));
465 if (fread(sec->symtab, 1, sec->shdr.sh_size, fp)
466 != sec->shdr.sh_size) {
467 die("Cannot read symbol table: %s\n",
470 for (j = 0; j < sec->shdr.sh_size/sizeof(Elf_Sym); j++) {
471 Elf_Sym *sym = &sec->symtab[j];
472 sym->st_name = elf_word_to_cpu(sym->st_name);
473 sym->st_value = elf_addr_to_cpu(sym->st_value);
474 sym->st_size = elf_xword_to_cpu(sym->st_size);
475 sym->st_shndx = elf_half_to_cpu(sym->st_shndx);
481 static void read_relocs(FILE *fp)
484 for (i = 0; i < ehdr.e_shnum; i++) {
485 struct section *sec = &secs[i];
486 if (sec->shdr.sh_type != SHT_REL_TYPE) {
489 sec->reltab = malloc(sec->shdr.sh_size);
491 die("malloc of %d bytes for relocs failed\n",
494 if (fseek(fp, sec->shdr.sh_offset, SEEK_SET) < 0) {
495 die("Seek to %d failed: %s\n",
496 sec->shdr.sh_offset, strerror(errno));
498 if (fread(sec->reltab, 1, sec->shdr.sh_size, fp)
499 != sec->shdr.sh_size) {
500 die("Cannot read symbol table: %s\n",
503 for (j = 0; j < sec->shdr.sh_size/sizeof(Elf_Rel); j++) {
504 Elf_Rel *rel = &sec->reltab[j];
505 rel->r_offset = elf_addr_to_cpu(rel->r_offset);
506 rel->r_info = elf_xword_to_cpu(rel->r_info);
507 #if (SHT_REL_TYPE == SHT_RELA)
508 rel->r_addend = elf_xword_to_cpu(rel->r_addend);
515 static void print_absolute_symbols(void)
521 format = "%5d %016"PRIx64" %5"PRId64" %10s %10s %12s %s\n";
523 format = "%5d %08"PRIx32" %5"PRId32" %10s %10s %12s %s\n";
525 printf("Absolute symbols\n");
526 printf(" Num: Value Size Type Bind Visibility Name\n");
527 for (i = 0; i < ehdr.e_shnum; i++) {
528 struct section *sec = &secs[i];
532 if (sec->shdr.sh_type != SHT_SYMTAB) {
535 sym_strtab = sec->link->strtab;
536 for (j = 0; j < sec->shdr.sh_size/sizeof(Elf_Sym); j++) {
539 sym = &sec->symtab[j];
540 name = sym_name(sym_strtab, sym);
541 if (sym->st_shndx != SHN_ABS) {
545 j, sym->st_value, sym->st_size,
546 sym_type(ELF_ST_TYPE(sym->st_info)),
547 sym_bind(ELF_ST_BIND(sym->st_info)),
548 sym_visibility(ELF_ST_VISIBILITY(sym->st_other)),
555 static void print_absolute_relocs(void)
561 format = "%016"PRIx64" %016"PRIx64" %10s %016"PRIx64" %s\n";
563 format = "%08"PRIx32" %08"PRIx32" %10s %08"PRIx32" %s\n";
565 for (i = 0; i < ehdr.e_shnum; i++) {
566 struct section *sec = &secs[i];
567 struct section *sec_applies, *sec_symtab;
571 if (sec->shdr.sh_type != SHT_REL_TYPE) {
574 sec_symtab = sec->link;
575 sec_applies = &secs[sec->shdr.sh_info];
576 if (!(sec_applies->shdr.sh_flags & SHF_ALLOC)) {
579 sh_symtab = sec_symtab->symtab;
580 sym_strtab = sec_symtab->link->strtab;
581 for (j = 0; j < sec->shdr.sh_size/sizeof(Elf_Rel); j++) {
585 rel = &sec->reltab[j];
586 sym = &sh_symtab[ELF_R_SYM(rel->r_info)];
587 name = sym_name(sym_strtab, sym);
588 if (sym->st_shndx != SHN_ABS) {
592 /* Absolute symbols are not relocated if bzImage is
593 * loaded at a non-compiled address. Display a warning
594 * to user at compile time about the absolute
595 * relocations present.
597 * User need to audit the code to make sure
598 * some symbols which should have been section
599 * relative have not become absolute because of some
600 * linker optimization or wrong programming usage.
602 * Before warning check if this absolute symbol
603 * relocation is harmless.
605 if (is_reloc(S_ABS, name) || is_reloc(S_REL, name))
609 printf("WARNING: Absolute relocations"
611 printf("Offset Info Type Sym.Value "
619 rel_type(ELF_R_TYPE(rel->r_info)),
629 static void add_reloc(struct relocs *r, uint32_t offset)
631 if (r->count == r->size) {
632 unsigned long newsize = r->size + 50000;
633 void *mem = realloc(r->offset, newsize * sizeof(r->offset[0]));
636 die("realloc of %ld entries for relocs failed\n",
641 r->offset[r->count++] = offset;
644 static void walk_relocs(int (*process)(struct section *sec, Elf_Rel *rel,
645 Elf_Sym *sym, const char *symname))
648 /* Walk through the relocations */
649 for (i = 0; i < ehdr.e_shnum; i++) {
652 struct section *sec_applies, *sec_symtab;
654 struct section *sec = &secs[i];
656 if (sec->shdr.sh_type != SHT_REL_TYPE) {
659 sec_symtab = sec->link;
660 sec_applies = &secs[sec->shdr.sh_info];
661 if (!(sec_applies->shdr.sh_flags & SHF_ALLOC)) {
664 sh_symtab = sec_symtab->symtab;
665 sym_strtab = sec_symtab->link->strtab;
666 for (j = 0; j < sec->shdr.sh_size/sizeof(Elf_Rel); j++) {
667 Elf_Rel *rel = &sec->reltab[j];
668 Elf_Sym *sym = &sh_symtab[ELF_R_SYM(rel->r_info)];
669 const char *symname = sym_name(sym_strtab, sym);
671 process(sec, rel, sym, symname);
677 * The .data..percpu section is a special case for x86_64 SMP kernels.
678 * It is used to initialize the actual per_cpu areas and to provide
679 * definitions for the per_cpu variables that correspond to their offsets
680 * within the percpu area. Since the values of all of the symbols need
681 * to be offsets from the start of the per_cpu area the virtual address
682 * (sh_addr) of .data..percpu is 0 in SMP kernels.
686 * Relocations that reference symbols in the per_cpu area do not
687 * need further relocation (since the value is an offset relative
688 * to the start of the per_cpu area that does not change).
690 * Relocations that apply to the per_cpu area need to have their
691 * offset adjusted by by the value of __per_cpu_load to make them
692 * point to the correct place in the loaded image (because the
693 * virtual address of .data..percpu is 0).
695 * For non SMP kernels .data..percpu is linked as part of the normal
696 * kernel data and does not require special treatment.
699 static int per_cpu_shndx = -1;
700 Elf_Addr per_cpu_load_addr;
702 static void percpu_init(void)
705 for (i = 0; i < ehdr.e_shnum; i++) {
707 if (strcmp(sec_name(i), ".data..percpu"))
710 if (secs[i].shdr.sh_addr != 0) /* non SMP kernel */
713 sym = sym_lookup("__per_cpu_load");
715 die("can't find __per_cpu_load\n");
718 per_cpu_load_addr = sym->st_value;
726 * Check to see if a symbol lies in the .data..percpu section.
727 * For some as yet not understood reason the "__init_begin"
728 * symbol which immediately preceeds the .data..percpu section
729 * also shows up as it it were part of it so we do an explict
730 * check for that symbol name and ignore it.
732 static int is_percpu_sym(ElfW(Sym) *sym, const char *symname)
734 return (sym->st_shndx == per_cpu_shndx) &&
735 strcmp(symname, "__init_begin");
739 static int do_reloc64(struct section *sec, Elf_Rel *rel, ElfW(Sym) *sym,
742 unsigned r_type = ELF64_R_TYPE(rel->r_info);
743 ElfW(Addr) offset = rel->r_offset;
744 int shn_abs = (sym->st_shndx == SHN_ABS) && !is_reloc(S_REL, symname);
746 if (sym->st_shndx == SHN_UNDEF)
750 * Adjust the offset if this reloc applies to the percpu section.
752 if (sec->shdr.sh_info == per_cpu_shndx)
753 offset += per_cpu_load_addr;
759 * NONE can be ignored and PC relative relocations don't
760 * need to be adjusted.
768 * References to the percpu area don't need to be adjusted.
770 if (is_percpu_sym(sym, symname))
775 * Whitelisted absolute symbols do not require
778 if (is_reloc(S_ABS, symname))
781 die("Invalid absolute %s relocation: %s\n",
782 rel_type(r_type), symname);
787 * Relocation offsets for 64 bit kernels are output
788 * as 32 bits and sign extended back to 64 bits when
789 * the relocations are processed.
790 * Make sure that the offset will fit.
792 if ((int32_t)offset != (int64_t)offset)
793 die("Relocation offset doesn't fit in 32 bits\n");
795 if (r_type == R_X86_64_64)
796 add_reloc(&relocs64, offset);
798 add_reloc(&relocs32, offset);
802 die("Unsupported relocation type: %s (%d)\n",
803 rel_type(r_type), r_type);
812 static int do_reloc32(struct section *sec, Elf_Rel *rel, Elf_Sym *sym,
815 unsigned r_type = ELF32_R_TYPE(rel->r_info);
816 int shn_abs = (sym->st_shndx == SHN_ABS) && !is_reloc(S_REL, symname);
824 * NONE can be ignored and PC relative relocations don't
825 * need to be adjusted.
832 * Whitelisted absolute symbols do not require
835 if (is_reloc(S_ABS, symname))
838 die("Invalid absolute %s relocation: %s\n",
839 rel_type(r_type), symname);
843 add_reloc(&relocs32, rel->r_offset);
847 die("Unsupported relocation type: %s (%d)\n",
848 rel_type(r_type), r_type);
855 static int do_reloc_real(struct section *sec, Elf_Rel *rel, Elf_Sym *sym,
858 unsigned r_type = ELF32_R_TYPE(rel->r_info);
859 int shn_abs = (sym->st_shndx == SHN_ABS) && !is_reloc(S_REL, symname);
867 * NONE can be ignored and PC relative relocations don't
868 * need to be adjusted.
875 * Whitelisted absolute symbols do not require
878 if (is_reloc(S_ABS, symname))
881 if (is_reloc(S_SEG, symname)) {
882 add_reloc(&relocs16, rel->r_offset);
886 if (!is_reloc(S_LIN, symname))
889 die("Invalid %s %s relocation: %s\n",
890 shn_abs ? "absolute" : "relative",
891 rel_type(r_type), symname);
897 * Whitelisted absolute symbols do not require
900 if (is_reloc(S_ABS, symname))
903 if (is_reloc(S_REL, symname)) {
904 add_reloc(&relocs32, rel->r_offset);
908 if (is_reloc(S_LIN, symname))
909 add_reloc(&relocs32, rel->r_offset);
912 die("Invalid %s %s relocation: %s\n",
913 shn_abs ? "absolute" : "relative",
914 rel_type(r_type), symname);
918 die("Unsupported relocation type: %s (%d)\n",
919 rel_type(r_type), r_type);
928 static int cmp_relocs(const void *va, const void *vb)
930 const uint32_t *a, *b;
932 return (*a == *b)? 0 : (*a > *b)? 1 : -1;
935 static void sort_relocs(struct relocs *r)
937 qsort(r->offset, r->count, sizeof(r->offset[0]), cmp_relocs);
940 static int write32(uint32_t v, FILE *f)
942 unsigned char buf[4];
944 put_unaligned_le32(v, buf);
945 return fwrite(buf, 1, 4, f) == 4 ? 0 : -1;
948 static int write32_as_text(uint32_t v, FILE *f)
950 return fprintf(f, "\t.long 0x%08"PRIx32"\n", v) > 0 ? 0 : -1;
953 static void emit_relocs(int as_text, int use_real_mode)
956 int (*write_reloc)(uint32_t, FILE *) = write32;
957 int (*do_reloc)(struct section *sec, Elf_Rel *rel, Elf_Sym *sym,
958 const char *symname);
962 do_reloc = do_reloc64;
964 die("--realmode not valid for a 64-bit ELF file");
967 do_reloc = do_reloc32;
969 do_reloc = do_reloc_real;
972 /* Collect up the relocations */
973 walk_relocs(do_reloc);
975 if (relocs16.count && !use_real_mode)
976 die("Segment relocations found but --realmode not specified\n");
978 /* Order the relocations for more efficient processing */
979 sort_relocs(&relocs16);
980 sort_relocs(&relocs32);
981 sort_relocs(&relocs64);
983 /* Print the relocations */
985 /* Print the relocations in a form suitable that
988 printf(".section \".data.reloc\",\"a\"\n");
989 printf(".balign 4\n");
990 write_reloc = write32_as_text;
994 write_reloc(relocs16.count, stdout);
995 for (i = 0; i < relocs16.count; i++)
996 write_reloc(relocs16.offset[i], stdout);
998 write_reloc(relocs32.count, stdout);
999 for (i = 0; i < relocs32.count; i++)
1000 write_reloc(relocs32.offset[i], stdout);
1002 if (ELF_BITS == 64) {
1004 write_reloc(0, stdout);
1006 /* Now print each relocation */
1007 for (i = 0; i < relocs64.count; i++)
1008 write_reloc(relocs64.offset[i], stdout);
1012 write_reloc(0, stdout);
1014 /* Now print each relocation */
1015 for (i = 0; i < relocs32.count; i++)
1016 write_reloc(relocs32.offset[i], stdout);
1021 # define process process_64
1023 # define process process_32
1026 void process(FILE *fp, int use_real_mode, int as_text,
1027 int show_absolute_syms, int show_absolute_relocs)
1029 regex_init(use_real_mode);
1037 if (show_absolute_syms) {
1038 print_absolute_symbols();
1041 if (show_absolute_relocs) {
1042 print_absolute_relocs();
1045 emit_relocs(as_text, use_real_mode);