1/* 2 * This program is free software; you can redistribute it and/or modify 3 * it under the terms of the GNU General Public License as published by 4 * the Free Software Foundation; either version 2 of the License, or 5 * (at your option) any later version. 6 * 7 * This program is distributed in the hope that it will be useful, 8 * but WITHOUT ANY WARRANTY; without even the implied warranty of 9 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 10 * GNU General Public License for more details. 11 * 12 * You should have received a copy of the GNU General Public License 13 * along with this program; if not, write to the Free Software 14 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. 15 * 16 * Copyright (C) IBM Corporation, 2009 17 */ 18 19#include <stdlib.h> 20#include <stdio.h> 21#include <string.h> 22#include <assert.h> 23#include <unistd.h> 24 25#define unlikely(cond) (cond) 26 27#include <asm/insn.h> 28#include <inat.c> 29#include <insn.c> 30 31/* 32 * Test of instruction analysis in general and insn_get_length() in 33 * particular. See if insn_get_length() and the disassembler agree 34 * on the length of each instruction in an elf disassembly. 35 * 36 * Usage: objdump -d a.out | awk -f distill.awk | ./test_get_len 37 */ 38 39const char *prog; 40static int verbose; 41static int x86_64; 42 43static void usage(void) 44{ 45 fprintf(stderr, "Usage: objdump -d a.out | awk -f distill.awk |" 46 " %s [-y|-n] [-v]\n", prog); 47 fprintf(stderr, "\t-y 64bit mode\n"); 48 fprintf(stderr, "\t-n 32bit mode\n"); 49 fprintf(stderr, "\t-v verbose mode\n"); 50 exit(1); 51} 52 53static void malformed_line(const char *line, int line_nr) 54{ 55 fprintf(stderr, "%s: malformed line %d:\n%s", prog, line_nr, line); 56 exit(3); 57} 58 59static void dump_field(FILE *fp, const char *name, const char *indent, 60 struct insn_field *field) 61{ 62 fprintf(fp, "%s.%s = {\n", indent, name); 63 fprintf(fp, "%s\t.value = %d, bytes[] = {%x, %x, %x, %x},\n", 64 indent, field->value, field->bytes[0], field->bytes[1], 65 field->bytes[2], field->bytes[3]); 66 fprintf(fp, "%s\t.got = %d, .nbytes = %d},\n", indent, 67 field->got, field->nbytes); 68} 69 70static void dump_insn(FILE *fp, struct insn *insn) 71{ 72 fprintf(fp, "Instruction = {\n"); 73 dump_field(fp, "prefixes", "\t", &insn->prefixes); 74 dump_field(fp, "rex_prefix", "\t", &insn->rex_prefix); 75 dump_field(fp, "vex_prefix", "\t", &insn->vex_prefix); 76 dump_field(fp, "opcode", "\t", &insn->opcode); 77 dump_field(fp, "modrm", "\t", &insn->modrm); 78 dump_field(fp, "sib", "\t", &insn->sib); 79 dump_field(fp, "displacement", "\t", &insn->displacement); 80 dump_field(fp, "immediate1", "\t", &insn->immediate1); 81 dump_field(fp, "immediate2", "\t", &insn->immediate2); 82 fprintf(fp, "\t.attr = %x, .opnd_bytes = %d, .addr_bytes = %d,\n", 83 insn->attr, insn->opnd_bytes, insn->addr_bytes); 84 fprintf(fp, "\t.length = %d, .x86_64 = %d, .kaddr = %p}\n", 85 insn->length, insn->x86_64, insn->kaddr); 86} 87 88static void parse_args(int argc, char **argv) 89{ 90 int c; 91 prog = argv[0]; 92 while ((c = getopt(argc, argv, "ynv")) != -1) { 93 switch (c) { 94 case 'y': 95 x86_64 = 1; 96 break; 97 case 'n': 98 x86_64 = 0; 99 break; 100 case 'v': 101 verbose = 1; 102 break; 103 default: 104 usage(); 105 } 106 } 107} 108 109#define BUFSIZE 256 110 111int main(int argc, char **argv) 112{ 113 char line[BUFSIZE], sym[BUFSIZE] = "<unknown>"; 114 unsigned char insn_buf[16]; 115 struct insn insn; 116 int insns = 0; 117 int warnings = 0; 118 119 parse_args(argc, argv); 120 121 while (fgets(line, BUFSIZE, stdin)) { 122 char copy[BUFSIZE], *s, *tab1, *tab2; 123 int nb = 0; 124 unsigned int b; 125 126 if (line[0] == '<') { 127 /* Symbol line */ 128 strcpy(sym, line); 129 continue; 130 } 131 132 insns++; 133 memset(insn_buf, 0, 16); 134 strcpy(copy, line); 135 tab1 = strchr(copy, '\t'); 136 if (!tab1) 137 malformed_line(line, insns); 138 s = tab1 + 1; 139 s += strspn(s, " "); 140 tab2 = strchr(s, '\t'); 141 if (!tab2) 142 malformed_line(line, insns); 143 *tab2 = '\0'; /* Characters beyond tab2 aren't examined */ 144 while (s < tab2) { 145 if (sscanf(s, "%x", &b) == 1) { 146 insn_buf[nb++] = (unsigned char) b; 147 s += 3; 148 } else 149 break; 150 } 151 /* Decode an instruction */ 152 insn_init(&insn, insn_buf, x86_64); 153 insn_get_length(&insn); 154 if (insn.length != nb) { 155 warnings++; 156 fprintf(stderr, "Warning: %s found difference at %s\n", 157 prog, sym); 158 fprintf(stderr, "Warning: %s", line); 159 fprintf(stderr, "Warning: objdump says %d bytes, but " 160 "insn_get_length() says %d\n", nb, 161 insn.length); 162 if (verbose) 163 dump_insn(stderr, &insn); 164 } 165 } 166 if (warnings) 167 fprintf(stderr, "Warning: decoded and checked %d" 168 " instructions with %d warnings\n", insns, warnings); 169 else 170 fprintf(stderr, "Succeed: decoded and checked %d" 171 " instructions\n", insns); 172 return 0; 173} 174