| // SPDX-License-Identifier: GPL-2.0-or-later |
| /* |
| * Copyright (C) 2017 Josh Poimboeuf <jpoimboe@redhat.com> |
| */ |
| |
| #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; |
| 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; |
| |
| |
| 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, ".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) { |
| 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; |
| } |
| |
| if (GELF_ST_TYPE(sym.st_info) == STT_SECTION) { |
| 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) { |
| WARN_ELF("elf_strptr"); |
| return -1; |
| } |
| } else { |
| name = elf_strptr(elf, strtab_idx, sym.st_name); |
| if (!name) { |
| WARN_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])); |
| } |
| |
| |
| 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 end:%d\n", |
| orc_type_name(orc[i].type), orc[i].end); |
| } |
| |
| elf_end(elf); |
| close(fd); |
| |
| return 0; |
| } |