| /* Test program for DWARF (.debug_frame) CFI handling. |
| Copyright (C) 2009-2010, 2013, 2015, 2018 Red Hat, Inc. |
| This file is part of elfutils. |
| |
| This file 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 3 of the License, or |
| (at your option) any later version. |
| |
| elfutils 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 <config.h> |
| #include <assert.h> |
| #include <inttypes.h> |
| #include ELFUTILS_HEADER(dw) |
| #include <dwarf.h> |
| #include <argp.h> |
| #include <stdio.h> |
| #include <sys/types.h> |
| #include <sys/stat.h> |
| #include <fcntl.h> |
| #include <locale.h> |
| #include <stdlib.h> |
| #include <string.h> |
| |
| #include "system.h" |
| #include "../libdw/known-dwarf.h" |
| |
| static const char * |
| op_name (unsigned int code) |
| { |
| static const char *const known[] = |
| { |
| #define DWARF_ONE_KNOWN_DW_OP(NAME, CODE) [CODE] = #NAME, |
| DWARF_ALL_KNOWN_DW_OP |
| #undef DWARF_ONE_KNOWN_DW_OP |
| }; |
| |
| if (likely (code < sizeof (known) / sizeof (known[0]))) |
| return known[code]; |
| |
| return NULL; |
| } |
| |
| static void |
| print_detail (int result, const Dwarf_Op *ops, size_t nops) |
| { |
| if (result < 0) |
| printf ("indeterminate (%s)\n", dwarf_errmsg (-1)); |
| else if (nops == 0) |
| printf ("%s\n", ops == NULL ? "same_value" : "undefined"); |
| else |
| { |
| printf ("%s expression:", result == 0 ? "location" : "value"); |
| for (size_t i = 0; i < nops; ++i) |
| { |
| printf (" %s", op_name(ops[i].atom)); |
| if (ops[i].number2 == 0) |
| { |
| if (ops[i].atom == DW_OP_addr) |
| printf ("(%#" PRIx64 ")", ops[i].number); |
| else if (ops[i].number != 0) |
| printf ("(%" PRId64 ")", ops[i].number); |
| } |
| else |
| printf ("(%" PRId64 ",%" PRId64 ")", |
| ops[i].number, ops[i].number2); |
| } |
| puts (""); |
| } |
| } |
| |
| static int |
| handle_address (Dwarf_CFI *cfi, GElf_Addr pc) |
| { |
| Dwarf_Frame *frame; |
| int result = dwarf_cfi_addrframe (cfi, pc, &frame); |
| if (result != 0) |
| { |
| printf ("dwarf_cfi_addrframe: %s\n", dwarf_errmsg (-1)); |
| return 1; |
| } |
| |
| Dwarf_Addr start = pc; |
| Dwarf_Addr end = pc; |
| bool signalp; |
| int ra_regno = dwarf_frame_info (frame, &start, &end, &signalp); |
| |
| printf ("%#" PRIx64 " => [%#" PRIx64 ", %#" PRIx64 "):\n", |
| pc, start, end); |
| |
| if (ra_regno < 0) |
| printf ("\treturn address register unavailable (%s)\n", |
| dwarf_errmsg (-1)); |
| else |
| printf ("\treturn address in reg%u%s\n", |
| ra_regno, signalp ? " (signal frame)" : ""); |
| |
| // Point cfa_ops to dummy to match print_detail expectations. |
| // (nops == 0 && cfa_ops != NULL => "undefined") |
| Dwarf_Op dummy; |
| Dwarf_Op *cfa_ops = &dummy; |
| size_t cfa_nops; |
| result = dwarf_frame_cfa (frame, &cfa_ops, &cfa_nops); |
| |
| printf ("\tCFA "); |
| print_detail (result, cfa_ops, cfa_nops); |
| |
| // Print the location of the first 10 (DWARF nr) registers |
| for (int r = 0; r < 10; r++) |
| { |
| Dwarf_Op ops_mem[3]; |
| Dwarf_Op *ops; |
| size_t nops; |
| printf ("\treg%d: ", r); |
| int reg_result = dwarf_frame_register (frame, r, ops_mem, &ops, &nops); |
| print_detail (reg_result, ops, nops); |
| result |= reg_result; |
| } |
| |
| free (frame); |
| return result; |
| } |
| |
| int |
| main (int argc, char *argv[]) |
| { |
| if (argc <= 2) |
| error (EXIT_FAILURE, 0, "need file name argument and addresses"); |
| |
| int fd = open (argv[1], O_RDONLY); |
| if (fd == -1) |
| error (EXIT_FAILURE, errno, "cannot open input file `%s'", argv[1]); |
| |
| elf_version (EV_CURRENT); |
| |
| Elf *elf = elf_begin (fd, ELF_C_READ, NULL); |
| if (elf == NULL) |
| error (EXIT_FAILURE, 0, "cannot create ELF descriptor: %s", |
| elf_errmsg (-1)); |
| |
| Dwarf *dwarf = dwarf_begin_elf (elf, DWARF_C_READ, NULL); |
| if (dwarf == NULL) |
| error (EXIT_FAILURE, 0, "cannot create DWARF descriptor: %s", |
| dwarf_errmsg (-1)); |
| |
| Dwarf_CFI *cfi = dwarf_getcfi (dwarf); |
| if (cfi == NULL) |
| error (EXIT_FAILURE, 0, "cannot get DWARF CFI from .dwarf_frame: %s", |
| dwarf_errmsg (-1)); |
| |
| int result = 0; |
| int args = 2; |
| do |
| { |
| char *endp; |
| uintmax_t addr = strtoumax (argv[args], &endp, 0); |
| if (endp != argv[args]) |
| result |= handle_address (cfi, addr); |
| else |
| result = 1; |
| } |
| while (args++ < argc - 1); |
| |
| dwarf_end (dwarf); |
| elf_end (elf); |
| |
| return result; |
| } |