Loading...
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 | // SPDX-License-Identifier: GPL-2.0-or-later /* * * Copyright (C) IBM Corporation, 2009 */ #include <stdlib.h> #include <stdio.h> #include <string.h> #include <assert.h> #include <unistd.h> #include <stdarg.h> #define unlikely(cond) (cond) #include <asm/insn.h> #include <inat.c> #include <insn.c> /* * Test of instruction analysis in general and insn_get_length() in * particular. See if insn_get_length() and the disassembler agree * on the length of each instruction in an elf disassembly. * * Usage: objdump -d a.out | awk -f objdump_reformat.awk | ./insn_decoder_test */ const char *prog; static int verbose; static int x86_64; static void usage(void) { fprintf(stderr, "Usage: objdump -d a.out | awk -f objdump_reformat.awk" " | %s [-y|-n] [-v]\n", prog); fprintf(stderr, "\t-y 64bit mode\n"); fprintf(stderr, "\t-n 32bit mode\n"); fprintf(stderr, "\t-v verbose mode\n"); exit(1); } static void malformed_line(const char *line, int line_nr) { fprintf(stderr, "%s: error: malformed line %d:\n%s", prog, line_nr, line); exit(3); } static void pr_warn(const char *fmt, ...) { va_list ap; fprintf(stderr, "%s: warning: ", prog); va_start(ap, fmt); vfprintf(stderr, fmt, ap); va_end(ap); } static void dump_field(FILE *fp, const char *name, const char *indent, struct insn_field *field) { fprintf(fp, "%s.%s = {\n", indent, name); fprintf(fp, "%s\t.value = %d, bytes[] = {%x, %x, %x, %x},\n", indent, field->value, field->bytes[0], field->bytes[1], field->bytes[2], field->bytes[3]); fprintf(fp, "%s\t.got = %d, .nbytes = %d},\n", indent, field->got, field->nbytes); } static void dump_insn(FILE *fp, struct insn *insn) { fprintf(fp, "Instruction = {\n"); dump_field(fp, "prefixes", "\t", &insn->prefixes); dump_field(fp, "rex_prefix", "\t", &insn->rex_prefix); dump_field(fp, "vex_prefix", "\t", &insn->vex_prefix); dump_field(fp, "opcode", "\t", &insn->opcode); dump_field(fp, "modrm", "\t", &insn->modrm); dump_field(fp, "sib", "\t", &insn->sib); dump_field(fp, "displacement", "\t", &insn->displacement); dump_field(fp, "immediate1", "\t", &insn->immediate1); dump_field(fp, "immediate2", "\t", &insn->immediate2); fprintf(fp, "\t.attr = %x, .opnd_bytes = %d, .addr_bytes = %d,\n", insn->attr, insn->opnd_bytes, insn->addr_bytes); fprintf(fp, "\t.length = %d, .x86_64 = %d, .kaddr = %p}\n", insn->length, insn->x86_64, insn->kaddr); } static void parse_args(int argc, char **argv) { int c; prog = argv[0]; while ((c = getopt(argc, argv, "ynv")) != -1) { switch (c) { case 'y': x86_64 = 1; break; case 'n': x86_64 = 0; break; case 'v': verbose = 1; break; default: usage(); } } } #define BUFSIZE 256 int main(int argc, char **argv) { char line[BUFSIZE], sym[BUFSIZE] = "<unknown>"; unsigned char insn_buff[16]; struct insn insn; int insns = 0; int warnings = 0; parse_args(argc, argv); while (fgets(line, BUFSIZE, stdin)) { char copy[BUFSIZE], *s, *tab1, *tab2; int nb = 0, ret; unsigned int b; if (line[0] == '<') { /* Symbol line */ strcpy(sym, line); continue; } insns++; memset(insn_buff, 0, 16); strcpy(copy, line); tab1 = strchr(copy, '\t'); if (!tab1) malformed_line(line, insns); s = tab1 + 1; s += strspn(s, " "); tab2 = strchr(s, '\t'); if (!tab2) malformed_line(line, insns); *tab2 = '\0'; /* Characters beyond tab2 aren't examined */ while (s < tab2) { if (sscanf(s, "%x", &b) == 1) { insn_buff[nb++] = (unsigned char) b; s += 3; } else break; } /* Decode an instruction */ ret = insn_decode(&insn, insn_buff, sizeof(insn_buff), x86_64 ? INSN_MODE_64 : INSN_MODE_32); if (ret < 0 || insn.length != nb) { warnings++; pr_warn("Found an x86 instruction decoder bug, " "please report this.\n", sym); pr_warn("%s", line); pr_warn("objdump says %d bytes, but insn_get_length() " "says %d\n", nb, insn.length); if (verbose) dump_insn(stderr, &insn); } } if (warnings) pr_warn("Decoded and checked %d instructions with %d " "failures\n", insns, warnings); else fprintf(stdout, "%s: success: Decoded and checked %d" " instructions\n", prog, insns); return 0; } |