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.
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.
12 * Copyright (C) IBM Corporation, 2009
22 #define unlikely(cond) (cond)
29 * Test of instruction analysis in general and insn_get_length() in
30 * particular. See if insn_get_length() and the disassembler agree
31 * on the length of each instruction in an elf disassembly.
33 * Usage: objdump -d a.out | awk -f objdump_reformat.awk | ./insn_decoder_test
40 static void usage(void)
42 fprintf(stderr, "Usage: objdump -d a.out | awk -f objdump_reformat.awk"
43 " | %s [-y|-n] [-v]\n", prog);
44 fprintf(stderr, "\t-y 64bit mode\n");
45 fprintf(stderr, "\t-n 32bit mode\n");
46 fprintf(stderr, "\t-v verbose mode\n");
50 static void malformed_line(const char *line, int line_nr)
52 fprintf(stderr, "%s: error: malformed line %d:\n%s",
57 static void pr_warn(const char *fmt, ...)
61 fprintf(stderr, "%s: warning: ", prog);
63 vfprintf(stderr, fmt, ap);
67 static void dump_field(FILE *fp, const char *name, const char *indent,
68 struct insn_field *field)
70 fprintf(fp, "%s.%s = {\n", indent, name);
71 fprintf(fp, "%s\t.value = %d, bytes[] = {%x, %x, %x, %x},\n",
72 indent, field->value, field->bytes[0], field->bytes[1],
73 field->bytes[2], field->bytes[3]);
74 fprintf(fp, "%s\t.got = %d, .nbytes = %d},\n", indent,
75 field->got, field->nbytes);
78 static void dump_insn(FILE *fp, struct insn *insn)
80 fprintf(fp, "Instruction = {\n");
81 dump_field(fp, "prefixes", "\t", &insn->prefixes);
82 dump_field(fp, "rex_prefix", "\t", &insn->rex_prefix);
83 dump_field(fp, "vex_prefix", "\t", &insn->vex_prefix);
84 dump_field(fp, "opcode", "\t", &insn->opcode);
85 dump_field(fp, "modrm", "\t", &insn->modrm);
86 dump_field(fp, "sib", "\t", &insn->sib);
87 dump_field(fp, "displacement", "\t", &insn->displacement);
88 dump_field(fp, "immediate1", "\t", &insn->immediate1);
89 dump_field(fp, "immediate2", "\t", &insn->immediate2);
90 fprintf(fp, "\t.attr = %x, .opnd_bytes = %d, .addr_bytes = %d,\n",
91 insn->attr, insn->opnd_bytes, insn->addr_bytes);
92 fprintf(fp, "\t.length = %d, .x86_64 = %d, .kaddr = %p}\n",
93 insn->length, insn->x86_64, insn->kaddr);
96 static void parse_args(int argc, char **argv)
100 while ((c = getopt(argc, argv, "ynv")) != -1) {
119 int main(int argc, char **argv)
121 char line[BUFSIZE], sym[BUFSIZE] = "<unknown>";
122 unsigned char insn_buf[16];
127 parse_args(argc, argv);
129 while (fgets(line, BUFSIZE, stdin)) {
130 char copy[BUFSIZE], *s, *tab1, *tab2;
134 if (line[0] == '<') {
141 memset(insn_buf, 0, 16);
143 tab1 = strchr(copy, '\t');
145 malformed_line(line, insns);
148 tab2 = strchr(s, '\t');
150 malformed_line(line, insns);
151 *tab2 = '\0'; /* Characters beyond tab2 aren't examined */
153 if (sscanf(s, "%x", &b) == 1) {
154 insn_buf[nb++] = (unsigned char) b;
159 /* Decode an instruction */
160 insn_init(&insn, insn_buf, sizeof(insn_buf), x86_64);
161 insn_get_length(&insn);
162 if (insn.length != nb) {
164 pr_warn("Found an x86 instruction decoder bug, "
165 "please report this.\n", sym);
167 pr_warn("objdump says %d bytes, but insn_get_length() "
168 "says %d\n", nb, insn.length);
170 dump_insn(stderr, &insn);
174 pr_warn("Decoded and checked %d instructions with %d "
175 "failures\n", insns, warnings);
177 fprintf(stdout, "%s: success: Decoded and checked %d"
178 " instructions\n", prog, insns);