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Linux kernel mirror (for testing) git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
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123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172737475767778798081828384858687888990919293949596979899100101102103104105106107108109110111112113114115116117118119120121122123124125126127128129130131132133134135136137138139140141142143144145146147148149150151152153154155156157// SPDX-License-Identifier: GPL-2.0-or-later/* * Copyright (C) 2017 Josh Poimboeuf <jpoimboe@redhat.com> */
#include <unistd.h>#include <asm/orc_types.h>#include <objtool/objtool.h>#include <objtool/orc.h>#include <objtool/warn.h>
int orc_dump(const char *filename){ int fd, nr_entries, i, *orc_ip = NULL, orc_size = 0; struct orc_entry *orc = NULL; char *name; size_t nr_sections; Elf64_Addr orc_ip_addr = 0; size_t shstrtab_idx, strtab_idx = 0; Elf *elf; Elf_Scn *scn; GElf_Shdr sh; GElf_Rela rela; GElf_Sym sym; Elf_Data *data, *symtab = NULL, *rela_orc_ip = NULL; struct elf dummy_elf = {};
elf_version(EV_CURRENT);
fd = open(filename, O_RDONLY); if (fd == -1) { perror("open"); return -1; }
elf = elf_begin(fd, ELF_C_READ_MMAP, NULL); if (!elf) { ERROR_ELF("elf_begin"); return -1; }
if (!elf64_getehdr(elf)) { ERROR_ELF("elf64_getehdr"); return -1; } memcpy(&dummy_elf.ehdr, elf64_getehdr(elf), sizeof(dummy_elf.ehdr));
if (elf_getshdrnum(elf, &nr_sections)) { ERROR_ELF("elf_getshdrnum"); return -1; }
if (elf_getshdrstrndx(elf, &shstrtab_idx)) { ERROR_ELF("elf_getshdrstrndx"); return -1; }
for (i = 0; i < nr_sections; i++) { scn = elf_getscn(elf, i); if (!scn) { ERROR_ELF("elf_getscn"); return -1; }
if (!gelf_getshdr(scn, &sh)) { ERROR_ELF("gelf_getshdr"); return -1; }
name = elf_strptr(elf, shstrtab_idx, sh.sh_name); if (!name) { ERROR_ELF("elf_strptr"); return -1; }
data = elf_getdata(scn, NULL); if (!data) { ERROR_ELF("elf_getdata"); return -1; }
if (!strcmp(name, ".symtab")) { symtab = data; } else if (!strcmp(name, ".strtab")) { strtab_idx = i; } else if (!strcmp(name, ".orc_unwind")) { orc = data->d_buf; orc_size = sh.sh_size; } else if (!strcmp(name, ".orc_unwind_ip")) { orc_ip = data->d_buf; orc_ip_addr = sh.sh_addr; } else if (!strcmp(name, ".rela.orc_unwind_ip")) { rela_orc_ip = data; } }
if (!symtab || !strtab_idx || !orc || !orc_ip) return 0;
if (orc_size % sizeof(*orc) != 0) { ERROR("bad .orc_unwind section size"); return -1; }
nr_entries = orc_size / sizeof(*orc); for (i = 0; i < nr_entries; i++) { if (rela_orc_ip) { if (!gelf_getrela(rela_orc_ip, i, &rela)) { ERROR_ELF("gelf_getrela"); return -1; }
if (!gelf_getsym(symtab, GELF_R_SYM(rela.r_info), &sym)) { ERROR_ELF("gelf_getsym"); return -1; }
if (GELF_ST_TYPE(sym.st_info) == STT_SECTION) { scn = elf_getscn(elf, sym.st_shndx); if (!scn) { ERROR_ELF("elf_getscn"); return -1; }
if (!gelf_getshdr(scn, &sh)) { ERROR_ELF("gelf_getshdr"); return -1; }
name = elf_strptr(elf, shstrtab_idx, sh.sh_name); if (!name) { ERROR_ELF("elf_strptr"); return -1; } } else { name = elf_strptr(elf, strtab_idx, sym.st_name); if (!name) { ERROR_ELF("elf_strptr"); return -1; } }
printf("%s+%llx:", name, (unsigned long long)rela.r_addend);
} else { printf("%llx:", (unsigned long long)(orc_ip_addr + (i * sizeof(int)) + orc_ip[i])); }
orc_print_dump(&dummy_elf, orc, i); }
elf_end(elf); close(fd);
return 0;}