linux/arch/x86/tools/test_get_len.c
Paul Bolle bdcc18b548 x86/decoder: Use stdout if insn decoder test is successful
If the instruction decoder test ran successful it prints a message like
this to stderr:
    Succeed: decoded and checked 1767380 instructions

But, as described in "console mode programming user interface guidelines
version 101" which doesn't exist, programs should use stderr for errors
or warnings. We're told about a successful run here, so the instruction
decoder test should use stdout.

Let's fix the typo too, while we're at it.

Signed-off-by: Paul Bolle <pebolle@tiscali.nl>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Link: http://lkml.kernel.org/r/1477428965-20548-2-git-send-email-pebolle@tiscali.nl
Signed-off-by: Ingo Molnar <mingo@kernel.org>
2016-10-26 08:41:06 +02:00

174 lines
4.6 KiB
C

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