1/* Test program for DWARF (.debug_frame) CFI handling. 2 Copyright (C) 2009-2010, 2013, 2015, 2018 Red Hat, Inc. 3 This file is part of elfutils. 4 5 This file is free software; you can redistribute it and/or modify 6 it under the terms of the GNU General Public License as published by 7 the Free Software Foundation; either version 3 of the License, or 8 (at your option) any later version. 9 10 elfutils is distributed in the hope that it will be useful, but 11 WITHOUT ANY WARRANTY; without even the implied warranty of 12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 13 GNU General Public License for more details. 14 15 You should have received a copy of the GNU General Public License 16 along with this program. If not, see <http://www.gnu.org/licenses/>. */ 17 18#include <config.h> 19#include <assert.h> 20#include <inttypes.h> 21#include ELFUTILS_HEADER(dw) 22#include <dwarf.h> 23#include <argp.h> 24#include <stdio.h> 25#include <sys/types.h> 26#include <sys/stat.h> 27#include <fcntl.h> 28#include <locale.h> 29#include <stdlib.h> 30#include <string.h> 31 32#include "system.h" 33#include "../libdw/known-dwarf.h" 34 35static const char * 36op_name (unsigned int code) 37{ 38 static const char *const known[] = 39 { 40#define DWARF_ONE_KNOWN_DW_OP(NAME, CODE) [CODE] = #NAME, 41 DWARF_ALL_KNOWN_DW_OP 42#undef DWARF_ONE_KNOWN_DW_OP 43 }; 44 45 if (likely (code < sizeof (known) / sizeof (known[0]))) 46 return known[code]; 47 48 return NULL; 49} 50 51static void 52print_detail (int result, const Dwarf_Op *ops, size_t nops) 53{ 54 if (result < 0) 55 printf ("indeterminate (%s)\n", dwarf_errmsg (-1)); 56 else if (nops == 0) 57 printf ("%s\n", ops == NULL ? "same_value" : "undefined"); 58 else 59 { 60 printf ("%s expression:", result == 0 ? "location" : "value"); 61 for (size_t i = 0; i < nops; ++i) 62 { 63 printf (" %s", op_name(ops[i].atom)); 64 if (ops[i].number2 == 0) 65 { 66 if (ops[i].atom == DW_OP_addr) 67 printf ("(%#" PRIx64 ")", ops[i].number); 68 else if (ops[i].number != 0) 69 printf ("(%" PRId64 ")", ops[i].number); 70 } 71 else 72 printf ("(%" PRId64 ",%" PRId64 ")", 73 ops[i].number, ops[i].number2); 74 } 75 puts (""); 76 } 77} 78 79static int 80handle_address (Dwarf_CFI *cfi, GElf_Addr pc) 81{ 82 Dwarf_Frame *frame; 83 int result = dwarf_cfi_addrframe (cfi, pc, &frame); 84 if (result != 0) 85 { 86 printf ("dwarf_cfi_addrframe: %s\n", dwarf_errmsg (-1)); 87 return 1; 88 } 89 90 Dwarf_Addr start = pc; 91 Dwarf_Addr end = pc; 92 bool signalp; 93 int ra_regno = dwarf_frame_info (frame, &start, &end, &signalp); 94 95 printf ("%#" PRIx64 " => [%#" PRIx64 ", %#" PRIx64 "):\n", 96 pc, start, end); 97 98 if (ra_regno < 0) 99 printf ("\treturn address register unavailable (%s)\n", 100 dwarf_errmsg (-1)); 101 else 102 printf ("\treturn address in reg%u%s\n", 103 ra_regno, signalp ? " (signal frame)" : ""); 104 105 // Point cfa_ops to dummy to match print_detail expectations. 106 // (nops == 0 && cfa_ops != NULL => "undefined") 107 Dwarf_Op dummy; 108 Dwarf_Op *cfa_ops = &dummy; 109 size_t cfa_nops; 110 result = dwarf_frame_cfa (frame, &cfa_ops, &cfa_nops); 111 112 printf ("\tCFA "); 113 print_detail (result, cfa_ops, cfa_nops); 114 115 // Print the location of the first 10 (DWARF nr) registers 116 for (int r = 0; r < 10; r++) 117 { 118 Dwarf_Op ops_mem[3]; 119 Dwarf_Op *ops; 120 size_t nops; 121 printf ("\treg%d: ", r); 122 int reg_result = dwarf_frame_register (frame, r, ops_mem, &ops, &nops); 123 print_detail (reg_result, ops, nops); 124 result |= reg_result; 125 } 126 127 free (frame); 128 return result; 129} 130 131int 132main (int argc, char *argv[]) 133{ 134 if (argc <= 2) 135 error (EXIT_FAILURE, 0, "need file name argument and addresses"); 136 137 int fd = open (argv[1], O_RDONLY); 138 if (fd == -1) 139 error (EXIT_FAILURE, errno, "cannot open input file `%s'", argv[1]); 140 141 elf_version (EV_CURRENT); 142 143 Elf *elf = elf_begin (fd, ELF_C_READ, NULL); 144 if (elf == NULL) 145 error (EXIT_FAILURE, 0, "cannot create ELF descriptor: %s", 146 elf_errmsg (-1)); 147 148 Dwarf *dwarf = dwarf_begin_elf (elf, DWARF_C_READ, NULL); 149 if (dwarf == NULL) 150 error (EXIT_FAILURE, 0, "cannot create DWARF descriptor: %s", 151 dwarf_errmsg (-1)); 152 153 Dwarf_CFI *cfi = dwarf_getcfi (dwarf); 154 if (cfi == NULL) 155 error (EXIT_FAILURE, 0, "cannot get DWARF CFI from .dwarf_frame: %s", 156 dwarf_errmsg (-1)); 157 158 int result = 0; 159 int args = 2; 160 do 161 { 162 char *endp; 163 uintmax_t addr = strtoumax (argv[args], &endp, 0); 164 if (endp != argv[args]) 165 result |= handle_address (cfi, addr); 166 else 167 result = 1; 168 } 169 while (args++ < argc - 1); 170 171 dwarf_end (dwarf); 172 elf_end (elf); 173 174 return result; 175} 176