1 // SPDX-License-Identifier: GPL-2.0
2 /* This is included from relocs_32/64.c */
4 #define ElfW(type) _ElfW(ELF_BITS, type)
5 #define _ElfW(bits, type) __ElfW(bits, type)
6 #define __ElfW(bits, type) Elf##bits##_##type
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)
15 static unsigned long shnum;
16 static unsigned int shstrndx;
24 static struct relocs relocs16;
25 static struct relocs relocs32;
27 static struct relocs relocs32neg;
28 static struct relocs relocs64;
38 static struct section *secs;
40 static const char * const sym_regex_kernel[S_NSYMTYPES] = {
42 * Following symbols have been audited. There values are constant and do
43 * not change if bzImage is loaded at a different physical address than
44 * the address for which it has been compiled. Don't warn user about
45 * absolute relocations present w.r.t these symbols.
48 "^(xen_irq_disable_direct_reloc$|"
49 "xen_save_fl_direct_reloc$|"
54 * These symbols are known to be relative, even if the linker marks them
55 * as absolute (typically defined outside any section in the linker script.)
58 "^(__init_(begin|end)|"
59 "__x86_cpu_dev_(start|end)|"
60 "(__parainstructions|__alt_instructions)(|_end)|"
61 "(__iommu_table|__apicdrivers|__smp_locks)(|_end)|"
62 "__(start|end)_pci_.*|"
63 "__(start|end)_builtin_fw|"
64 "__(start|stop)___ksymtab(|_gpl|_unused|_unused_gpl|_gpl_future)|"
65 "__(start|stop)___kcrctab(|_gpl|_unused|_unused_gpl|_gpl_future)|"
66 "__(start|stop)___param|"
67 "__(start|stop)___modver|"
68 "__(start|stop)___bug_table|"
69 "__tracedata_(start|end)|"
70 "__(start|stop)_notes|"
72 "__end_rodata_aligned|"
74 "(jiffies|jiffies_64)|"
78 "__end_rodata_hpage_align|"
85 static const char * const sym_regex_realmode[S_NSYMTYPES] = {
87 * These symbols are known to be relative, even if the linker marks them
88 * as absolute (typically defined outside any section in the linker script.)
94 * These are 16-bit segment symbols when compiling 16-bit code.
100 * These are offsets belonging to segments, as opposed to linear addresses,
101 * when compiling 16-bit code.
107 static const char * const *sym_regex;
109 static regex_t sym_regex_c[S_NSYMTYPES];
110 static int is_reloc(enum symtype type, const char *sym_name)
112 return sym_regex[type] &&
113 !regexec(&sym_regex_c[type], sym_name, 0, NULL, 0);
116 static void regex_init(int use_real_mode)
123 sym_regex = sym_regex_realmode;
125 sym_regex = sym_regex_kernel;
127 for (i = 0; i < S_NSYMTYPES; i++) {
131 err = regcomp(&sym_regex_c[i], sym_regex[i],
132 REG_EXTENDED|REG_NOSUB);
135 regerror(err, &sym_regex_c[i], errbuf, sizeof(errbuf));
141 static const char *sym_type(unsigned type)
143 static const char *type_name[] = {
144 #define SYM_TYPE(X) [X] = #X
145 SYM_TYPE(STT_NOTYPE),
146 SYM_TYPE(STT_OBJECT),
148 SYM_TYPE(STT_SECTION),
150 SYM_TYPE(STT_COMMON),
154 const char *name = "unknown sym type name";
155 if (type < ARRAY_SIZE(type_name)) {
156 name = type_name[type];
161 static const char *sym_bind(unsigned bind)
163 static const char *bind_name[] = {
164 #define SYM_BIND(X) [X] = #X
166 SYM_BIND(STB_GLOBAL),
170 const char *name = "unknown sym bind name";
171 if (bind < ARRAY_SIZE(bind_name)) {
172 name = bind_name[bind];
177 static const char *sym_visibility(unsigned visibility)
179 static const char *visibility_name[] = {
180 #define SYM_VISIBILITY(X) [X] = #X
181 SYM_VISIBILITY(STV_DEFAULT),
182 SYM_VISIBILITY(STV_INTERNAL),
183 SYM_VISIBILITY(STV_HIDDEN),
184 SYM_VISIBILITY(STV_PROTECTED),
185 #undef SYM_VISIBILITY
187 const char *name = "unknown sym visibility name";
188 if (visibility < ARRAY_SIZE(visibility_name)) {
189 name = visibility_name[visibility];
194 static const char *rel_type(unsigned type)
196 static const char *type_name[] = {
197 #define REL_TYPE(X) [X] = #X
199 REL_TYPE(R_X86_64_NONE),
200 REL_TYPE(R_X86_64_64),
201 REL_TYPE(R_X86_64_PC64),
202 REL_TYPE(R_X86_64_PC32),
203 REL_TYPE(R_X86_64_GOT32),
204 REL_TYPE(R_X86_64_PLT32),
205 REL_TYPE(R_X86_64_COPY),
206 REL_TYPE(R_X86_64_GLOB_DAT),
207 REL_TYPE(R_X86_64_JUMP_SLOT),
208 REL_TYPE(R_X86_64_RELATIVE),
209 REL_TYPE(R_X86_64_GOTPCREL),
210 REL_TYPE(R_X86_64_32),
211 REL_TYPE(R_X86_64_32S),
212 REL_TYPE(R_X86_64_16),
213 REL_TYPE(R_X86_64_PC16),
214 REL_TYPE(R_X86_64_8),
215 REL_TYPE(R_X86_64_PC8),
217 REL_TYPE(R_386_NONE),
219 REL_TYPE(R_386_PC32),
220 REL_TYPE(R_386_GOT32),
221 REL_TYPE(R_386_PLT32),
222 REL_TYPE(R_386_COPY),
223 REL_TYPE(R_386_GLOB_DAT),
224 REL_TYPE(R_386_JMP_SLOT),
225 REL_TYPE(R_386_RELATIVE),
226 REL_TYPE(R_386_GOTOFF),
227 REL_TYPE(R_386_GOTPC),
231 REL_TYPE(R_386_PC16),
235 const char *name = "unknown type rel type name";
236 if (type < ARRAY_SIZE(type_name) && type_name[type]) {
237 name = type_name[type];
242 static const char *sec_name(unsigned shndx)
244 const char *sec_strtab;
246 sec_strtab = secs[shstrndx].strtab;
249 name = sec_strtab + secs[shndx].shdr.sh_name;
251 else if (shndx == SHN_ABS) {
254 else if (shndx == SHN_COMMON) {
260 static const char *sym_name(const char *sym_strtab, Elf_Sym *sym)
265 name = sym_strtab + sym->st_name;
268 name = sec_name(sym->st_shndx);
273 static Elf_Sym *sym_lookup(const char *symname)
276 for (i = 0; i < shnum; i++) {
277 struct section *sec = &secs[i];
283 if (sec->shdr.sh_type != SHT_SYMTAB)
286 nsyms = sec->shdr.sh_size/sizeof(Elf_Sym);
287 symtab = sec->symtab;
288 strtab = sec->link->strtab;
290 for (sym = symtab; --nsyms >= 0; sym++) {
293 if (strcmp(symname, strtab + sym->st_name) == 0)
300 #if BYTE_ORDER == LITTLE_ENDIAN
301 #define le16_to_cpu(val) (val)
302 #define le32_to_cpu(val) (val)
303 #define le64_to_cpu(val) (val)
305 #if BYTE_ORDER == BIG_ENDIAN
306 #define le16_to_cpu(val) bswap_16(val)
307 #define le32_to_cpu(val) bswap_32(val)
308 #define le64_to_cpu(val) bswap_64(val)
311 static uint16_t elf16_to_cpu(uint16_t val)
313 return le16_to_cpu(val);
316 static uint32_t elf32_to_cpu(uint32_t val)
318 return le32_to_cpu(val);
321 #define elf_half_to_cpu(x) elf16_to_cpu(x)
322 #define elf_word_to_cpu(x) elf32_to_cpu(x)
325 static uint64_t elf64_to_cpu(uint64_t val)
327 return le64_to_cpu(val);
329 #define elf_addr_to_cpu(x) elf64_to_cpu(x)
330 #define elf_off_to_cpu(x) elf64_to_cpu(x)
331 #define elf_xword_to_cpu(x) elf64_to_cpu(x)
333 #define elf_addr_to_cpu(x) elf32_to_cpu(x)
334 #define elf_off_to_cpu(x) elf32_to_cpu(x)
335 #define elf_xword_to_cpu(x) elf32_to_cpu(x)
338 static void read_ehdr(FILE *fp)
340 if (fread(&ehdr, sizeof(ehdr), 1, fp) != 1) {
341 die("Cannot read ELF header: %s\n",
344 if (memcmp(ehdr.e_ident, ELFMAG, SELFMAG) != 0) {
345 die("No ELF magic\n");
347 if (ehdr.e_ident[EI_CLASS] != ELF_CLASS) {
348 die("Not a %d bit executable\n", ELF_BITS);
350 if (ehdr.e_ident[EI_DATA] != ELFDATA2LSB) {
351 die("Not a LSB ELF executable\n");
353 if (ehdr.e_ident[EI_VERSION] != EV_CURRENT) {
354 die("Unknown ELF version\n");
356 /* Convert the fields to native endian */
357 ehdr.e_type = elf_half_to_cpu(ehdr.e_type);
358 ehdr.e_machine = elf_half_to_cpu(ehdr.e_machine);
359 ehdr.e_version = elf_word_to_cpu(ehdr.e_version);
360 ehdr.e_entry = elf_addr_to_cpu(ehdr.e_entry);
361 ehdr.e_phoff = elf_off_to_cpu(ehdr.e_phoff);
362 ehdr.e_shoff = elf_off_to_cpu(ehdr.e_shoff);
363 ehdr.e_flags = elf_word_to_cpu(ehdr.e_flags);
364 ehdr.e_ehsize = elf_half_to_cpu(ehdr.e_ehsize);
365 ehdr.e_phentsize = elf_half_to_cpu(ehdr.e_phentsize);
366 ehdr.e_phnum = elf_half_to_cpu(ehdr.e_phnum);
367 ehdr.e_shentsize = elf_half_to_cpu(ehdr.e_shentsize);
368 ehdr.e_shnum = elf_half_to_cpu(ehdr.e_shnum);
369 ehdr.e_shstrndx = elf_half_to_cpu(ehdr.e_shstrndx);
371 shnum = ehdr.e_shnum;
372 shstrndx = ehdr.e_shstrndx;
374 if ((ehdr.e_type != ET_EXEC) && (ehdr.e_type != ET_DYN))
375 die("Unsupported ELF header type\n");
376 if (ehdr.e_machine != ELF_MACHINE)
377 die("Not for %s\n", ELF_MACHINE_NAME);
378 if (ehdr.e_version != EV_CURRENT)
379 die("Unknown ELF version\n");
380 if (ehdr.e_ehsize != sizeof(Elf_Ehdr))
381 die("Bad Elf header size\n");
382 if (ehdr.e_phentsize != sizeof(Elf_Phdr))
383 die("Bad program header entry\n");
384 if (ehdr.e_shentsize != sizeof(Elf_Shdr))
385 die("Bad section header entry\n");
388 if (shnum == SHN_UNDEF || shstrndx == SHN_XINDEX) {
391 if (fseek(fp, ehdr.e_shoff, SEEK_SET) < 0)
392 die("Seek to %d failed: %s\n", ehdr.e_shoff, strerror(errno));
394 if (fread(&shdr, sizeof(shdr), 1, fp) != 1)
395 die("Cannot read initial ELF section header: %s\n", strerror(errno));
397 if (shnum == SHN_UNDEF)
398 shnum = elf_xword_to_cpu(shdr.sh_size);
400 if (shstrndx == SHN_XINDEX)
401 shstrndx = elf_word_to_cpu(shdr.sh_link);
404 if (shstrndx >= shnum)
405 die("String table index out of bounds\n");
408 static void read_shdrs(FILE *fp)
413 secs = calloc(shnum, sizeof(struct section));
415 die("Unable to allocate %d section headers\n",
418 if (fseek(fp, ehdr.e_shoff, SEEK_SET) < 0) {
419 die("Seek to %d failed: %s\n",
420 ehdr.e_shoff, strerror(errno));
422 for (i = 0; i < shnum; i++) {
423 struct section *sec = &secs[i];
424 if (fread(&shdr, sizeof(shdr), 1, fp) != 1)
425 die("Cannot read ELF section headers %d/%d: %s\n",
426 i, shnum, strerror(errno));
427 sec->shdr.sh_name = elf_word_to_cpu(shdr.sh_name);
428 sec->shdr.sh_type = elf_word_to_cpu(shdr.sh_type);
429 sec->shdr.sh_flags = elf_xword_to_cpu(shdr.sh_flags);
430 sec->shdr.sh_addr = elf_addr_to_cpu(shdr.sh_addr);
431 sec->shdr.sh_offset = elf_off_to_cpu(shdr.sh_offset);
432 sec->shdr.sh_size = elf_xword_to_cpu(shdr.sh_size);
433 sec->shdr.sh_link = elf_word_to_cpu(shdr.sh_link);
434 sec->shdr.sh_info = elf_word_to_cpu(shdr.sh_info);
435 sec->shdr.sh_addralign = elf_xword_to_cpu(shdr.sh_addralign);
436 sec->shdr.sh_entsize = elf_xword_to_cpu(shdr.sh_entsize);
437 if (sec->shdr.sh_link < shnum)
438 sec->link = &secs[sec->shdr.sh_link];
443 static void read_strtabs(FILE *fp)
446 for (i = 0; i < shnum; i++) {
447 struct section *sec = &secs[i];
448 if (sec->shdr.sh_type != SHT_STRTAB) {
451 sec->strtab = malloc(sec->shdr.sh_size);
453 die("malloc of %d bytes for strtab failed\n",
456 if (fseek(fp, sec->shdr.sh_offset, SEEK_SET) < 0) {
457 die("Seek to %d failed: %s\n",
458 sec->shdr.sh_offset, strerror(errno));
460 if (fread(sec->strtab, 1, sec->shdr.sh_size, fp)
461 != sec->shdr.sh_size) {
462 die("Cannot read symbol table: %s\n",
468 static void read_symtabs(FILE *fp)
471 for (i = 0; i < shnum; i++) {
472 struct section *sec = &secs[i];
473 if (sec->shdr.sh_type != SHT_SYMTAB) {
476 sec->symtab = malloc(sec->shdr.sh_size);
478 die("malloc of %d bytes for symtab failed\n",
481 if (fseek(fp, sec->shdr.sh_offset, SEEK_SET) < 0) {
482 die("Seek to %d failed: %s\n",
483 sec->shdr.sh_offset, strerror(errno));
485 if (fread(sec->symtab, 1, sec->shdr.sh_size, fp)
486 != sec->shdr.sh_size) {
487 die("Cannot read symbol table: %s\n",
490 for (j = 0; j < sec->shdr.sh_size/sizeof(Elf_Sym); j++) {
491 Elf_Sym *sym = &sec->symtab[j];
492 sym->st_name = elf_word_to_cpu(sym->st_name);
493 sym->st_value = elf_addr_to_cpu(sym->st_value);
494 sym->st_size = elf_xword_to_cpu(sym->st_size);
495 sym->st_shndx = elf_half_to_cpu(sym->st_shndx);
501 static void read_relocs(FILE *fp)
504 for (i = 0; i < shnum; i++) {
505 struct section *sec = &secs[i];
506 if (sec->shdr.sh_type != SHT_REL_TYPE) {
509 sec->reltab = malloc(sec->shdr.sh_size);
511 die("malloc of %d bytes for relocs failed\n",
514 if (fseek(fp, sec->shdr.sh_offset, SEEK_SET) < 0) {
515 die("Seek to %d failed: %s\n",
516 sec->shdr.sh_offset, strerror(errno));
518 if (fread(sec->reltab, 1, sec->shdr.sh_size, fp)
519 != sec->shdr.sh_size) {
520 die("Cannot read symbol table: %s\n",
523 for (j = 0; j < sec->shdr.sh_size/sizeof(Elf_Rel); j++) {
524 Elf_Rel *rel = &sec->reltab[j];
525 rel->r_offset = elf_addr_to_cpu(rel->r_offset);
526 rel->r_info = elf_xword_to_cpu(rel->r_info);
527 #if (SHT_REL_TYPE == SHT_RELA)
528 rel->r_addend = elf_xword_to_cpu(rel->r_addend);
535 static void print_absolute_symbols(void)
541 format = "%5d %016"PRIx64" %5"PRId64" %10s %10s %12s %s\n";
543 format = "%5d %08"PRIx32" %5"PRId32" %10s %10s %12s %s\n";
545 printf("Absolute symbols\n");
546 printf(" Num: Value Size Type Bind Visibility Name\n");
547 for (i = 0; i < shnum; i++) {
548 struct section *sec = &secs[i];
552 if (sec->shdr.sh_type != SHT_SYMTAB) {
555 sym_strtab = sec->link->strtab;
556 for (j = 0; j < sec->shdr.sh_size/sizeof(Elf_Sym); j++) {
559 sym = &sec->symtab[j];
560 name = sym_name(sym_strtab, sym);
561 if (sym->st_shndx != SHN_ABS) {
565 j, sym->st_value, sym->st_size,
566 sym_type(ELF_ST_TYPE(sym->st_info)),
567 sym_bind(ELF_ST_BIND(sym->st_info)),
568 sym_visibility(ELF_ST_VISIBILITY(sym->st_other)),
575 static void print_absolute_relocs(void)
581 format = "%016"PRIx64" %016"PRIx64" %10s %016"PRIx64" %s\n";
583 format = "%08"PRIx32" %08"PRIx32" %10s %08"PRIx32" %s\n";
585 for (i = 0; i < shnum; i++) {
586 struct section *sec = &secs[i];
587 struct section *sec_applies, *sec_symtab;
591 if (sec->shdr.sh_type != SHT_REL_TYPE) {
594 sec_symtab = sec->link;
595 sec_applies = &secs[sec->shdr.sh_info];
596 if (!(sec_applies->shdr.sh_flags & SHF_ALLOC)) {
600 * Do not perform relocations in .notes section; any
601 * values there are meant for pre-boot consumption (e.g.
604 if (sec_applies->shdr.sh_type == SHT_NOTE) {
607 sh_symtab = sec_symtab->symtab;
608 sym_strtab = sec_symtab->link->strtab;
609 for (j = 0; j < sec->shdr.sh_size/sizeof(Elf_Rel); j++) {
613 rel = &sec->reltab[j];
614 sym = &sh_symtab[ELF_R_SYM(rel->r_info)];
615 name = sym_name(sym_strtab, sym);
616 if (sym->st_shndx != SHN_ABS) {
620 /* Absolute symbols are not relocated if bzImage is
621 * loaded at a non-compiled address. Display a warning
622 * to user at compile time about the absolute
623 * relocations present.
625 * User need to audit the code to make sure
626 * some symbols which should have been section
627 * relative have not become absolute because of some
628 * linker optimization or wrong programming usage.
630 * Before warning check if this absolute symbol
631 * relocation is harmless.
633 if (is_reloc(S_ABS, name) || is_reloc(S_REL, name))
637 printf("WARNING: Absolute relocations"
639 printf("Offset Info Type Sym.Value "
647 rel_type(ELF_R_TYPE(rel->r_info)),
657 static void add_reloc(struct relocs *r, uint32_t offset)
659 if (r->count == r->size) {
660 unsigned long newsize = r->size + 50000;
661 void *mem = realloc(r->offset, newsize * sizeof(r->offset[0]));
664 die("realloc of %ld entries for relocs failed\n",
669 r->offset[r->count++] = offset;
672 static void walk_relocs(int (*process)(struct section *sec, Elf_Rel *rel,
673 Elf_Sym *sym, const char *symname))
676 /* Walk through the relocations */
677 for (i = 0; i < shnum; i++) {
680 struct section *sec_applies, *sec_symtab;
682 struct section *sec = &secs[i];
684 if (sec->shdr.sh_type != SHT_REL_TYPE) {
687 sec_symtab = sec->link;
688 sec_applies = &secs[sec->shdr.sh_info];
689 if (!(sec_applies->shdr.sh_flags & SHF_ALLOC)) {
692 sh_symtab = sec_symtab->symtab;
693 sym_strtab = sec_symtab->link->strtab;
694 for (j = 0; j < sec->shdr.sh_size/sizeof(Elf_Rel); j++) {
695 Elf_Rel *rel = &sec->reltab[j];
696 Elf_Sym *sym = &sh_symtab[ELF_R_SYM(rel->r_info)];
697 const char *symname = sym_name(sym_strtab, sym);
699 process(sec, rel, sym, symname);
705 * The .data..percpu section is a special case for x86_64 SMP kernels.
706 * It is used to initialize the actual per_cpu areas and to provide
707 * definitions for the per_cpu variables that correspond to their offsets
708 * within the percpu area. Since the values of all of the symbols need
709 * to be offsets from the start of the per_cpu area the virtual address
710 * (sh_addr) of .data..percpu is 0 in SMP kernels.
714 * Relocations that reference symbols in the per_cpu area do not
715 * need further relocation (since the value is an offset relative
716 * to the start of the per_cpu area that does not change).
718 * Relocations that apply to the per_cpu area need to have their
719 * offset adjusted by by the value of __per_cpu_load to make them
720 * point to the correct place in the loaded image (because the
721 * virtual address of .data..percpu is 0).
723 * For non SMP kernels .data..percpu is linked as part of the normal
724 * kernel data and does not require special treatment.
727 static int per_cpu_shndx = -1;
728 static Elf_Addr per_cpu_load_addr;
730 static void percpu_init(void)
733 for (i = 0; i < shnum; i++) {
735 if (strcmp(sec_name(i), ".data..percpu"))
738 if (secs[i].shdr.sh_addr != 0) /* non SMP kernel */
741 sym = sym_lookup("__per_cpu_load");
743 die("can't find __per_cpu_load\n");
746 per_cpu_load_addr = sym->st_value;
754 * Check to see if a symbol lies in the .data..percpu section.
756 * The linker incorrectly associates some symbols with the
757 * .data..percpu section so we also need to check the symbol
758 * name to make sure that we classify the symbol correctly.
760 * The GNU linker incorrectly associates:
764 * The "gold" linker incorrectly associates:
765 * init_per_cpu__fixed_percpu_data
766 * init_per_cpu__gdt_page
768 static int is_percpu_sym(ElfW(Sym) *sym, const char *symname)
770 return (sym->st_shndx == per_cpu_shndx) &&
771 strcmp(symname, "__init_begin") &&
772 strcmp(symname, "__per_cpu_load") &&
773 strncmp(symname, "init_per_cpu_", 13);
777 static int do_reloc64(struct section *sec, Elf_Rel *rel, ElfW(Sym) *sym,
780 unsigned r_type = ELF64_R_TYPE(rel->r_info);
781 ElfW(Addr) offset = rel->r_offset;
782 int shn_abs = (sym->st_shndx == SHN_ABS) && !is_reloc(S_REL, symname);
784 if (sym->st_shndx == SHN_UNDEF)
788 * Adjust the offset if this reloc applies to the percpu section.
790 if (sec->shdr.sh_info == per_cpu_shndx)
791 offset += per_cpu_load_addr;
795 /* NONE can be ignored. */
801 * PC relative relocations don't need to be adjusted unless
802 * referencing a percpu symbol.
804 * NB: R_X86_64_PLT32 can be treated as R_X86_64_PC32.
806 if (is_percpu_sym(sym, symname))
807 add_reloc(&relocs32neg, offset);
812 * Only used by jump labels
814 if (is_percpu_sym(sym, symname))
815 die("Invalid R_X86_64_PC64 relocation against per-CPU symbol %s\n",
823 * References to the percpu area don't need to be adjusted.
825 if (is_percpu_sym(sym, symname))
830 * Whitelisted absolute symbols do not require
833 if (is_reloc(S_ABS, symname))
836 die("Invalid absolute %s relocation: %s\n",
837 rel_type(r_type), symname);
842 * Relocation offsets for 64 bit kernels are output
843 * as 32 bits and sign extended back to 64 bits when
844 * the relocations are processed.
845 * Make sure that the offset will fit.
847 if ((int32_t)offset != (int64_t)offset)
848 die("Relocation offset doesn't fit in 32 bits\n");
850 if (r_type == R_X86_64_64)
851 add_reloc(&relocs64, offset);
853 add_reloc(&relocs32, offset);
857 die("Unsupported relocation type: %s (%d)\n",
858 rel_type(r_type), r_type);
867 static int do_reloc32(struct section *sec, Elf_Rel *rel, Elf_Sym *sym,
870 unsigned r_type = ELF32_R_TYPE(rel->r_info);
871 int shn_abs = (sym->st_shndx == SHN_ABS) && !is_reloc(S_REL, symname);
880 * NONE can be ignored and PC relative relocations don't need
881 * to be adjusted. Because sym must be defined, R_386_PLT32 can
882 * be treated the same way as R_386_PC32.
889 * Whitelisted absolute symbols do not require
892 if (is_reloc(S_ABS, symname))
895 die("Invalid absolute %s relocation: %s\n",
896 rel_type(r_type), symname);
900 add_reloc(&relocs32, rel->r_offset);
904 die("Unsupported relocation type: %s (%d)\n",
905 rel_type(r_type), r_type);
912 static int do_reloc_real(struct section *sec, Elf_Rel *rel, Elf_Sym *sym,
915 unsigned r_type = ELF32_R_TYPE(rel->r_info);
916 int shn_abs = (sym->st_shndx == SHN_ABS) && !is_reloc(S_REL, symname);
925 * NONE can be ignored and PC relative relocations don't need
926 * to be adjusted. Because sym must be defined, R_386_PLT32 can
927 * be treated the same way as R_386_PC32.
934 * Whitelisted absolute symbols do not require
937 if (is_reloc(S_ABS, symname))
940 if (is_reloc(S_SEG, symname)) {
941 add_reloc(&relocs16, rel->r_offset);
945 if (!is_reloc(S_LIN, symname))
948 die("Invalid %s %s relocation: %s\n",
949 shn_abs ? "absolute" : "relative",
950 rel_type(r_type), symname);
956 * Whitelisted absolute symbols do not require
959 if (is_reloc(S_ABS, symname))
962 if (is_reloc(S_REL, symname)) {
963 add_reloc(&relocs32, rel->r_offset);
967 if (is_reloc(S_LIN, symname))
968 add_reloc(&relocs32, rel->r_offset);
971 die("Invalid %s %s relocation: %s\n",
972 shn_abs ? "absolute" : "relative",
973 rel_type(r_type), symname);
977 die("Unsupported relocation type: %s (%d)\n",
978 rel_type(r_type), r_type);
987 static int cmp_relocs(const void *va, const void *vb)
989 const uint32_t *a, *b;
991 return (*a == *b)? 0 : (*a > *b)? 1 : -1;
994 static void sort_relocs(struct relocs *r)
996 qsort(r->offset, r->count, sizeof(r->offset[0]), cmp_relocs);
999 static int write32(uint32_t v, FILE *f)
1001 unsigned char buf[4];
1003 put_unaligned_le32(v, buf);
1004 return fwrite(buf, 1, 4, f) == 4 ? 0 : -1;
1007 static int write32_as_text(uint32_t v, FILE *f)
1009 return fprintf(f, "\t.long 0x%08"PRIx32"\n", v) > 0 ? 0 : -1;
1012 static void emit_relocs(int as_text, int use_real_mode)
1015 int (*write_reloc)(uint32_t, FILE *) = write32;
1016 int (*do_reloc)(struct section *sec, Elf_Rel *rel, Elf_Sym *sym,
1017 const char *symname);
1021 do_reloc = do_reloc64;
1023 die("--realmode not valid for a 64-bit ELF file");
1026 do_reloc = do_reloc32;
1028 do_reloc = do_reloc_real;
1031 /* Collect up the relocations */
1032 walk_relocs(do_reloc);
1034 if (relocs16.count && !use_real_mode)
1035 die("Segment relocations found but --realmode not specified\n");
1037 /* Order the relocations for more efficient processing */
1038 sort_relocs(&relocs32);
1040 sort_relocs(&relocs32neg);
1041 sort_relocs(&relocs64);
1043 sort_relocs(&relocs16);
1046 /* Print the relocations */
1048 /* Print the relocations in a form suitable that
1051 printf(".section \".data.reloc\",\"a\"\n");
1052 printf(".balign 4\n");
1053 write_reloc = write32_as_text;
1056 if (use_real_mode) {
1057 write_reloc(relocs16.count, stdout);
1058 for (i = 0; i < relocs16.count; i++)
1059 write_reloc(relocs16.offset[i], stdout);
1061 write_reloc(relocs32.count, stdout);
1062 for (i = 0; i < relocs32.count; i++)
1063 write_reloc(relocs32.offset[i], stdout);
1067 write_reloc(0, stdout);
1069 /* Now print each relocation */
1070 for (i = 0; i < relocs64.count; i++)
1071 write_reloc(relocs64.offset[i], stdout);
1074 write_reloc(0, stdout);
1076 /* Now print each inverse 32-bit relocation */
1077 for (i = 0; i < relocs32neg.count; i++)
1078 write_reloc(relocs32neg.offset[i], stdout);
1082 write_reloc(0, stdout);
1084 /* Now print each relocation */
1085 for (i = 0; i < relocs32.count; i++)
1086 write_reloc(relocs32.offset[i], stdout);
1091 * As an aid to debugging problems with different linkers
1092 * print summary information about the relocs.
1093 * Since different linkers tend to emit the sections in
1094 * different orders we use the section names in the output.
1096 static int do_reloc_info(struct section *sec, Elf_Rel *rel, ElfW(Sym) *sym,
1097 const char *symname)
1099 printf("%s\t%s\t%s\t%s\n",
1100 sec_name(sec->shdr.sh_info),
1101 rel_type(ELF_R_TYPE(rel->r_info)),
1103 sec_name(sym->st_shndx));
1107 static void print_reloc_info(void)
1109 printf("reloc section\treloc type\tsymbol\tsymbol section\n");
1110 walk_relocs(do_reloc_info);
1114 # define process process_64
1116 # define process process_32
1119 void process(FILE *fp, int use_real_mode, int as_text,
1120 int show_absolute_syms, int show_absolute_relocs,
1121 int show_reloc_info)
1123 regex_init(use_real_mode);
1131 if (show_absolute_syms) {
1132 print_absolute_symbols();
1135 if (show_absolute_relocs) {
1136 print_absolute_relocs();
1139 if (show_reloc_info) {
1143 emit_relocs(as_text, use_real_mode);