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![Borislav Petkov](/assets/img/avatar_default.png)
Simplify code, no functional changes. Signed-off-by: Borislav Petkov <bp@suse.de> Link: https://lkml.kernel.org/r/20210304174237.31945-17-bp@alien8.de
174 lines
4.1 KiB
C
174 lines
4.1 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
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/*
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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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#include <stdarg.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 objdump_reformat.awk | ./insn_decoder_test
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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 objdump_reformat.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: error: malformed line %d:\n%s",
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prog, line_nr, line);
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exit(3);
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}
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static void pr_warn(const char *fmt, ...)
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{
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va_list ap;
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fprintf(stderr, "%s: warning: ", prog);
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va_start(ap, fmt);
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vfprintf(stderr, fmt, ap);
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va_end(ap);
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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], sym[BUFSIZE] = "<unknown>";
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unsigned char insn_buff[16];
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struct insn insn;
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int insns = 0;
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int warnings = 0;
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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, ret;
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unsigned int b;
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if (line[0] == '<') {
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/* Symbol line */
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strcpy(sym, line);
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continue;
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}
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insns++;
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memset(insn_buff, 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_buff[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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ret = insn_decode(&insn, insn_buff, sizeof(insn_buff),
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x86_64 ? INSN_MODE_64 : INSN_MODE_32);
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if (ret < 0 || insn.length != nb) {
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warnings++;
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pr_warn("Found an x86 instruction decoder bug, "
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"please report this.\n", sym);
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pr_warn("%s", line);
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pr_warn("objdump says %d bytes, but insn_get_length() "
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"says %d\n", nb, insn.length);
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if (verbose)
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dump_insn(stderr, &insn);
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}
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}
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if (warnings)
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pr_warn("Decoded and checked %d instructions with %d "
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"failures\n", insns, warnings);
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else
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fprintf(stdout, "%s: success: Decoded and checked %d"
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" instructions\n", prog, insns);
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return 0;
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}
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