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-rw-r--r--arch/x86/tools/insn_decoder_test.c180
1 files changed, 180 insertions, 0 deletions
diff --git a/arch/x86/tools/insn_decoder_test.c b/arch/x86/tools/insn_decoder_test.c
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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 * Copyright (C) IBM Corporation, 2009
13 */
14
15#include <stdlib.h>
16#include <stdio.h>
17#include <string.h>
18#include <assert.h>
19#include <unistd.h>
20#include <stdarg.h>
21
22#define unlikely(cond) (cond)
23
24#include <asm/insn.h>
25#include <inat.c>
26#include <insn.c>
27
28/*
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.
32 *
33 * Usage: objdump -d a.out | awk -f objdump_reformat.awk | ./insn_decoder_test
34 */
35
36const char *prog;
37static int verbose;
38static int x86_64;
39
40static void usage(void)
41{
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");
47 exit(1);
48}
49
50static void malformed_line(const char *line, int line_nr)
51{
52 fprintf(stderr, "%s: error: malformed line %d:\n%s",
53 prog, line_nr, line);
54 exit(3);
55}
56
57static void pr_warn(const char *fmt, ...)
58{
59 va_list ap;
60
61 fprintf(stderr, "%s: warning: ", prog);
62 va_start(ap, fmt);
63 vfprintf(stderr, fmt, ap);
64 va_end(ap);
65}
66
67static void dump_field(FILE *fp, const char *name, const char *indent,
68 struct insn_field *field)
69{
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);
76}
77
78static void dump_insn(FILE *fp, struct insn *insn)
79{
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);
94}
95
96static void parse_args(int argc, char **argv)
97{
98 int c;
99 prog = argv[0];
100 while ((c = getopt(argc, argv, "ynv")) != -1) {
101 switch (c) {
102 case 'y':
103 x86_64 = 1;
104 break;
105 case 'n':
106 x86_64 = 0;
107 break;
108 case 'v':
109 verbose = 1;
110 break;
111 default:
112 usage();
113 }
114 }
115}
116
117#define BUFSIZE 256
118
119int main(int argc, char **argv)
120{
121 char line[BUFSIZE], sym[BUFSIZE] = "<unknown>";
122 unsigned char insn_buf[16];
123 struct insn insn;
124 int insns = 0;
125 int warnings = 0;
126
127 parse_args(argc, argv);
128
129 while (fgets(line, BUFSIZE, stdin)) {
130 char copy[BUFSIZE], *s, *tab1, *tab2;
131 int nb = 0;
132 unsigned int b;
133
134 if (line[0] == '<') {
135 /* Symbol line */
136 strcpy(sym, line);
137 continue;
138 }
139
140 insns++;
141 memset(insn_buf, 0, 16);
142 strcpy(copy, line);
143 tab1 = strchr(copy, '\t');
144 if (!tab1)
145 malformed_line(line, insns);
146 s = tab1 + 1;
147 s += strspn(s, " ");
148 tab2 = strchr(s, '\t');
149 if (!tab2)
150 malformed_line(line, insns);
151 *tab2 = '\0'; /* Characters beyond tab2 aren't examined */
152 while (s < tab2) {
153 if (sscanf(s, "%x", &b) == 1) {
154 insn_buf[nb++] = (unsigned char) b;
155 s += 3;
156 } else
157 break;
158 }
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) {
163 warnings++;
164 pr_warn("Found an x86 instruction decoder bug, "
165 "please report this.\n", sym);
166 pr_warn("%s", line);
167 pr_warn("objdump says %d bytes, but insn_get_length() "
168 "says %d\n", nb, insn.length);
169 if (verbose)
170 dump_insn(stderr, &insn);
171 }
172 }
173 if (warnings)
174 pr_warn("Decoded and checked %d instructions with %d "
175 "failures\n", insns, warnings);
176 else
177 fprintf(stdout, "%s: success: Decoded and checked %d"
178 " instructions\n", prog, insns);
179 return 0;
180}
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