161 lines
4.2 KiB
C
161 lines
4.2 KiB
C
/*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
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*
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* Copyright (C) IBM Corporation, 2009
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*/
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#include <stdlib.h>
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#include <stdio.h>
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#include <string.h>
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#include <assert.h>
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#include <unistd.h>
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#define unlikely(cond) (cond)
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#include <asm/insn.h>
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#include <inat.c>
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#include <insn.c>
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/*
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* Test of instruction analysis in general and insn_get_length() in
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* particular. See if insn_get_length() and the disassembler agree
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* on the length of each instruction in an elf disassembly.
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*
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* Usage: objdump -d a.out | awk -f distill.awk | ./test_get_len
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*/
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const char *prog;
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static int verbose;
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static int x86_64;
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static void usage(void)
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{
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fprintf(stderr, "Usage: objdump -d a.out | awk -f distill.awk |"
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" %s [-y|-n] [-v] \n", prog);
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fprintf(stderr, "\t-y 64bit mode\n");
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fprintf(stderr, "\t-n 32bit mode\n");
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fprintf(stderr, "\t-v verbose mode\n");
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exit(1);
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}
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static void malformed_line(const char *line, int line_nr)
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{
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fprintf(stderr, "%s: malformed line %d:\n%s", prog, line_nr, line);
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exit(3);
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}
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static void dump_field(FILE *fp, const char *name, const char *indent,
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struct insn_field *field)
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{
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fprintf(fp, "%s.%s = {\n", indent, name);
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fprintf(fp, "%s\t.value = %d, bytes[] = {%x, %x, %x, %x},\n",
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indent, field->value, field->bytes[0], field->bytes[1],
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field->bytes[2], field->bytes[3]);
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fprintf(fp, "%s\t.got = %d, .nbytes = %d},\n", indent,
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field->got, field->nbytes);
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}
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static void dump_insn(FILE *fp, struct insn *insn)
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{
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fprintf(fp, "Instruction = { \n");
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dump_field(fp, "prefixes", "\t", &insn->prefixes);
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dump_field(fp, "rex_prefix", "\t", &insn->rex_prefix);
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dump_field(fp, "vex_prefix", "\t", &insn->vex_prefix);
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dump_field(fp, "opcode", "\t", &insn->opcode);
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dump_field(fp, "modrm", "\t", &insn->modrm);
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dump_field(fp, "sib", "\t", &insn->sib);
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dump_field(fp, "displacement", "\t", &insn->displacement);
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dump_field(fp, "immediate1", "\t", &insn->immediate1);
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dump_field(fp, "immediate2", "\t", &insn->immediate2);
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fprintf(fp, "\t.attr = %x, .opnd_bytes = %d, .addr_bytes = %d,\n",
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insn->attr, insn->opnd_bytes, insn->addr_bytes);
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fprintf(fp, "\t.length = %d, .x86_64 = %d, .kaddr = %p}\n",
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insn->length, insn->x86_64, insn->kaddr);
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}
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static void parse_args(int argc, char **argv)
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{
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int c;
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prog = argv[0];
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while ((c = getopt(argc, argv, "ynv")) != -1) {
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switch (c) {
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case 'y':
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x86_64 = 1;
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break;
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case 'n':
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x86_64 = 0;
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break;
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case 'v':
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verbose = 1;
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break;
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default:
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usage();
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}
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}
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}
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#define BUFSIZE 256
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int main(int argc, char **argv)
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{
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char line[BUFSIZE];
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unsigned char insn_buf[16];
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struct insn insn;
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int insns = 0, c;
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parse_args(argc, argv);
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while (fgets(line, BUFSIZE, stdin)) {
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char copy[BUFSIZE], *s, *tab1, *tab2;
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int nb = 0;
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unsigned int b;
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insns++;
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memset(insn_buf, 0, 16);
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strcpy(copy, line);
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tab1 = strchr(copy, '\t');
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if (!tab1)
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malformed_line(line, insns);
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s = tab1 + 1;
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s += strspn(s, " ");
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tab2 = strchr(s, '\t');
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if (!tab2)
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malformed_line(line, insns);
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*tab2 = '\0'; /* Characters beyond tab2 aren't examined */
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while (s < tab2) {
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if (sscanf(s, "%x", &b) == 1) {
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insn_buf[nb++] = (unsigned char) b;
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s += 3;
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} else
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break;
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}
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/* Decode an instruction */
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insn_init(&insn, insn_buf, x86_64);
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insn_get_length(&insn);
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if (insn.length != nb) {
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fprintf(stderr, "Error: %s", line);
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fprintf(stderr, "Error: objdump says %d bytes, but "
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"insn_get_length() says %d\n", nb,
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insn.length);
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if (verbose)
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dump_insn(stderr, &insn);
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exit(2);
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}
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}
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fprintf(stderr, "Succeed: decoded and checked %d instructions\n",
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insns);
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return 0;
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}
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