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215 lines
4.2 KiB
215 lines
4.2 KiB
// SPDX-License-Identifier: GPL-2.0-or-later |
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/* |
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* Copyright (C) 2017 Josh Poimboeuf <[email protected]> |
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*/ |
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#include <unistd.h> |
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#include <linux/objtool.h> |
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#include <asm/orc_types.h> |
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#include <objtool/objtool.h> |
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#include <objtool/warn.h> |
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#include <objtool/endianness.h> |
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static const char *reg_name(unsigned int reg) |
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{ |
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switch (reg) { |
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case ORC_REG_PREV_SP: |
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return "prevsp"; |
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case ORC_REG_DX: |
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return "dx"; |
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case ORC_REG_DI: |
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return "di"; |
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case ORC_REG_BP: |
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return "bp"; |
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case ORC_REG_SP: |
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return "sp"; |
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case ORC_REG_R10: |
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return "r10"; |
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case ORC_REG_R13: |
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return "r13"; |
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case ORC_REG_BP_INDIRECT: |
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return "bp(ind)"; |
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case ORC_REG_SP_INDIRECT: |
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return "sp(ind)"; |
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default: |
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return "?"; |
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} |
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} |
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static const char *orc_type_name(unsigned int type) |
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{ |
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switch (type) { |
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case UNWIND_HINT_TYPE_CALL: |
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return "call"; |
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case UNWIND_HINT_TYPE_REGS: |
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return "regs"; |
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case UNWIND_HINT_TYPE_REGS_PARTIAL: |
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return "regs (partial)"; |
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default: |
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return "?"; |
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} |
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} |
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static void print_reg(unsigned int reg, int offset) |
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{ |
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if (reg == ORC_REG_BP_INDIRECT) |
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printf("(bp%+d)", offset); |
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else if (reg == ORC_REG_SP_INDIRECT) |
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printf("(sp)%+d", offset); |
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else if (reg == ORC_REG_UNDEFINED) |
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printf("(und)"); |
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else |
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printf("%s%+d", reg_name(reg), offset); |
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} |
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int orc_dump(const char *_objname) |
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{ |
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int fd, nr_entries, i, *orc_ip = NULL, orc_size = 0; |
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struct orc_entry *orc = NULL; |
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char *name; |
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size_t nr_sections; |
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Elf64_Addr orc_ip_addr = 0; |
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size_t shstrtab_idx, strtab_idx = 0; |
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Elf *elf; |
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Elf_Scn *scn; |
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GElf_Shdr sh; |
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GElf_Rela rela; |
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GElf_Sym sym; |
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Elf_Data *data, *symtab = NULL, *rela_orc_ip = NULL; |
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objname = _objname; |
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elf_version(EV_CURRENT); |
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fd = open(objname, O_RDONLY); |
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if (fd == -1) { |
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perror("open"); |
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return -1; |
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} |
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elf = elf_begin(fd, ELF_C_READ_MMAP, NULL); |
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if (!elf) { |
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WARN_ELF("elf_begin"); |
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return -1; |
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} |
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if (elf_getshdrnum(elf, &nr_sections)) { |
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WARN_ELF("elf_getshdrnum"); |
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return -1; |
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} |
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if (elf_getshdrstrndx(elf, &shstrtab_idx)) { |
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WARN_ELF("elf_getshdrstrndx"); |
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return -1; |
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} |
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for (i = 0; i < nr_sections; i++) { |
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scn = elf_getscn(elf, i); |
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if (!scn) { |
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WARN_ELF("elf_getscn"); |
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return -1; |
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} |
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if (!gelf_getshdr(scn, &sh)) { |
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WARN_ELF("gelf_getshdr"); |
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return -1; |
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} |
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name = elf_strptr(elf, shstrtab_idx, sh.sh_name); |
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if (!name) { |
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WARN_ELF("elf_strptr"); |
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return -1; |
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} |
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data = elf_getdata(scn, NULL); |
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if (!data) { |
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WARN_ELF("elf_getdata"); |
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return -1; |
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} |
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if (!strcmp(name, ".symtab")) { |
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symtab = data; |
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} else if (!strcmp(name, ".strtab")) { |
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strtab_idx = i; |
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} else if (!strcmp(name, ".orc_unwind")) { |
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orc = data->d_buf; |
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orc_size = sh.sh_size; |
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} else if (!strcmp(name, ".orc_unwind_ip")) { |
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orc_ip = data->d_buf; |
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orc_ip_addr = sh.sh_addr; |
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} else if (!strcmp(name, ".rela.orc_unwind_ip")) { |
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rela_orc_ip = data; |
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} |
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} |
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if (!symtab || !strtab_idx || !orc || !orc_ip) |
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return 0; |
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if (orc_size % sizeof(*orc) != 0) { |
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WARN("bad .orc_unwind section size"); |
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return -1; |
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} |
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nr_entries = orc_size / sizeof(*orc); |
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for (i = 0; i < nr_entries; i++) { |
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if (rela_orc_ip) { |
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if (!gelf_getrela(rela_orc_ip, i, &rela)) { |
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WARN_ELF("gelf_getrela"); |
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return -1; |
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} |
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if (!gelf_getsym(symtab, GELF_R_SYM(rela.r_info), &sym)) { |
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WARN_ELF("gelf_getsym"); |
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return -1; |
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} |
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if (GELF_ST_TYPE(sym.st_info) == STT_SECTION) { |
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scn = elf_getscn(elf, sym.st_shndx); |
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if (!scn) { |
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WARN_ELF("elf_getscn"); |
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return -1; |
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} |
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if (!gelf_getshdr(scn, &sh)) { |
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WARN_ELF("gelf_getshdr"); |
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return -1; |
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} |
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name = elf_strptr(elf, shstrtab_idx, sh.sh_name); |
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if (!name) { |
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WARN_ELF("elf_strptr"); |
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return -1; |
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} |
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} else { |
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name = elf_strptr(elf, strtab_idx, sym.st_name); |
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if (!name) { |
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WARN_ELF("elf_strptr"); |
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return -1; |
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} |
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} |
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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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} |
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printf(" sp:"); |
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print_reg(orc[i].sp_reg, bswap_if_needed(orc[i].sp_offset)); |
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printf(" bp:"); |
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print_reg(orc[i].bp_reg, bswap_if_needed(orc[i].bp_offset)); |
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printf(" type:%s end:%d\n", |
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orc_type_name(orc[i].type), orc[i].end); |
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} |
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elf_end(elf); |
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close(fd); |
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return 0; |
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}
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