1 // SPDX-License-Identifier: GPL-2.0-or-later
4 * Copyright (C) IBM Corporation, 2009
14 #define unlikely(cond) (cond)
21 * Test of instruction analysis in general and insn_get_length() in
22 * particular. See if insn_get_length() and the disassembler agree
23 * on the length of each instruction in an elf disassembly.
25 * Usage: objdump -d a.out | awk -f objdump_reformat.awk | ./insn_decoder_test
32 static void usage(void)
34 fprintf(stderr, "Usage: objdump -d a.out | awk -f objdump_reformat.awk"
35 " | %s [-y|-n] [-v]\n", prog);
36 fprintf(stderr, "\t-y 64bit mode\n");
37 fprintf(stderr, "\t-n 32bit mode\n");
38 fprintf(stderr, "\t-v verbose mode\n");
42 static void malformed_line(const char *line, int line_nr)
44 fprintf(stderr, "%s: error: malformed line %d:\n%s",
49 static void pr_warn(const char *fmt, ...)
53 fprintf(stderr, "%s: warning: ", prog);
55 vfprintf(stderr, fmt, ap);
59 static void dump_field(FILE *fp, const char *name, const char *indent,
60 struct insn_field *field)
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);
70 static void dump_insn(FILE *fp, struct insn *insn)
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);
88 static void parse_args(int argc, char **argv)
92 while ((c = getopt(argc, argv, "ynv")) != -1) {
111 int main(int argc, char **argv)
113 char line[BUFSIZE], sym[BUFSIZE] = "<unknown>";
114 unsigned char insn_buff[16];
119 parse_args(argc, argv);
121 while (fgets(line, BUFSIZE, stdin)) {
122 char copy[BUFSIZE], *s, *tab1, *tab2;
126 if (line[0] == '<') {
133 memset(insn_buff, 0, 16);
135 tab1 = strchr(copy, '\t');
137 malformed_line(line, insns);
140 tab2 = strchr(s, '\t');
142 malformed_line(line, insns);
143 *tab2 = '\0'; /* Characters beyond tab2 aren't examined */
145 if (sscanf(s, "%x", &b) == 1) {
146 insn_buff[nb++] = (unsigned char) b;
151 /* Decode an instruction */
152 insn_init(&insn, insn_buff, sizeof(insn_buff), x86_64);
153 insn_get_length(&insn);
154 if (insn.length != nb) {
156 pr_warn("Found an x86 instruction decoder bug, "
157 "please report this.\n", sym);
159 pr_warn("objdump says %d bytes, but insn_get_length() "
160 "says %d\n", nb, insn.length);
162 dump_insn(stderr, &insn);
166 pr_warn("Decoded and checked %d instructions with %d "
167 "failures\n", insns, warnings);
169 fprintf(stdout, "%s: success: Decoded and checked %d"
170 " instructions\n", prog, insns);