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tools/objtool/orc_dump.c
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/* * Copyright (C) 2017 Josh Poimboeuf <jpoimboe@redhat.com> * * This program is free software; you can redistribute it and/or * modify it under the terms of the GNU General Public License * as published by the Free Software Foundation; either version 2 * of the License, or (at your option) any later version. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. * * You should have received a copy of the GNU General Public License * along with this program; if not, see <http://www.gnu.org/licenses/>. */ #include <unistd.h> #include "orc.h" #include "warn.h" static const char *reg_name(unsigned int reg) { switch (reg) { case ORC_REG_PREV_SP: return "prevsp"; case ORC_REG_DX: return "dx"; case ORC_REG_DI: return "di"; case ORC_REG_BP: return "bp"; case ORC_REG_SP: return "sp"; case ORC_REG_R10: return "r10"; case ORC_REG_R13: return "r13"; case ORC_REG_BP_INDIRECT: return "bp(ind)"; case ORC_REG_SP_INDIRECT: return "sp(ind)"; default: return "?"; } } static const char *orc_type_name(unsigned int type) { switch (type) { case ORC_TYPE_CALL: return "call"; case ORC_TYPE_REGS: return "regs"; case ORC_TYPE_REGS_IRET: return "iret"; default: return "?"; } } static void print_reg(unsigned int reg, int offset) { if (reg == ORC_REG_BP_INDIRECT) printf("(bp%+d)", offset); else if (reg == ORC_REG_SP_INDIRECT) printf("(sp%+d)", offset); else if (reg == ORC_REG_UNDEFINED) printf("(und)"); else printf("%s%+d", reg_name(reg), offset); } int orc_dump(const char *_objname) { int fd, nr_entries, i, *orc_ip = NULL, orc_size = 0; struct orc_entry *orc = NULL; char *name; |
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size_t nr_sections; Elf64_Addr orc_ip_addr = 0; |
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size_t shstrtab_idx; Elf *elf; Elf_Scn *scn; GElf_Shdr sh; GElf_Rela rela; GElf_Sym sym; Elf_Data *data, *symtab = NULL, *rela_orc_ip = NULL; objname = _objname; elf_version(EV_CURRENT); fd = open(objname, O_RDONLY); if (fd == -1) { perror("open"); return -1; } elf = elf_begin(fd, ELF_C_READ_MMAP, NULL); if (!elf) { WARN_ELF("elf_begin"); return -1; } if (elf_getshdrnum(elf, &nr_sections)) { WARN_ELF("elf_getshdrnum"); return -1; } if (elf_getshdrstrndx(elf, &shstrtab_idx)) { WARN_ELF("elf_getshdrstrndx"); return -1; } for (i = 0; i < nr_sections; i++) { scn = elf_getscn(elf, i); if (!scn) { WARN_ELF("elf_getscn"); return -1; } if (!gelf_getshdr(scn, &sh)) { WARN_ELF("gelf_getshdr"); return -1; } name = elf_strptr(elf, shstrtab_idx, sh.sh_name); if (!name) { WARN_ELF("elf_strptr"); return -1; } data = elf_getdata(scn, NULL); if (!data) { WARN_ELF("elf_getdata"); return -1; } if (!strcmp(name, ".symtab")) { symtab = data; } 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 || !orc || !orc_ip) return 0; if (orc_size % sizeof(*orc) != 0) { WARN("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)) { WARN_ELF("gelf_getrela"); return -1; } if (!gelf_getsym(symtab, GELF_R_SYM(rela.r_info), &sym)) { WARN_ELF("gelf_getsym"); return -1; } scn = elf_getscn(elf, sym.st_shndx); if (!scn) { WARN_ELF("elf_getscn"); return -1; } if (!gelf_getshdr(scn, &sh)) { WARN_ELF("gelf_getshdr"); return -1; } name = elf_strptr(elf, shstrtab_idx, sh.sh_name); if (!name || !*name) { WARN_ELF("elf_strptr"); return -1; } |
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printf("%s+%llx:", name, (unsigned long long)rela.r_addend); |
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} else { |
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printf("%llx:", (unsigned long long)(orc_ip_addr + (i * sizeof(int)) + orc_ip[i])); |
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} printf(" sp:"); print_reg(orc[i].sp_reg, orc[i].sp_offset); printf(" bp:"); print_reg(orc[i].bp_reg, orc[i].bp_offset); printf(" type:%s ", orc_type_name(orc[i].type)); } elf_end(elf); close(fd); return 0; } |