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/arch/x86/tools/test_get_len.c

https://bitbucket.org/thekraven/iscream_thunderc-2.6.35
C | 173 lines | 131 code | 16 blank | 26 comment | 15 complexity | 5bde22af5c8dbb9f58c4d90a287a5351 MD5 | raw file
Possible License(s): GPL-2.0, LGPL-2.0, AGPL-1.0
  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 * You should have received a copy of the GNU General Public License
 13 * along with this program; if not, write to the Free Software
 14 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
 15 *
 16 * Copyright (C) IBM Corporation, 2009
 17 */
 18
 19#include <stdlib.h>
 20#include <stdio.h>
 21#include <string.h>
 22#include <assert.h>
 23#include <unistd.h>
 24
 25#define unlikely(cond) (cond)
 26
 27#include <asm/insn.h>
 28#include <inat.c>
 29#include <insn.c>
 30
 31/*
 32 * Test of instruction analysis in general and insn_get_length() in
 33 * particular.  See if insn_get_length() and the disassembler agree
 34 * on the length of each instruction in an elf disassembly.
 35 *
 36 * Usage: objdump -d a.out | awk -f distill.awk | ./test_get_len
 37 */
 38
 39const char *prog;
 40static int verbose;
 41static int x86_64;
 42
 43static void usage(void)
 44{
 45	fprintf(stderr, "Usage: objdump -d a.out | awk -f distill.awk |"
 46		" %s [-y|-n] [-v]\n", prog);
 47	fprintf(stderr, "\t-y	64bit mode\n");
 48	fprintf(stderr, "\t-n	32bit mode\n");
 49	fprintf(stderr, "\t-v	verbose mode\n");
 50	exit(1);
 51}
 52
 53static void malformed_line(const char *line, int line_nr)
 54{
 55	fprintf(stderr, "%s: malformed line %d:\n%s", prog, line_nr, line);
 56	exit(3);
 57}
 58
 59static void dump_field(FILE *fp, const char *name, const char *indent,
 60		       struct insn_field *field)
 61{
 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);
 68}
 69
 70static void dump_insn(FILE *fp, struct insn *insn)
 71{
 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);
 86}
 87
 88static void parse_args(int argc, char **argv)
 89{
 90	int c;
 91	prog = argv[0];
 92	while ((c = getopt(argc, argv, "ynv")) != -1) {
 93		switch (c) {
 94		case 'y':
 95			x86_64 = 1;
 96			break;
 97		case 'n':
 98			x86_64 = 0;
 99			break;
100		case 'v':
101			verbose = 1;
102			break;
103		default:
104			usage();
105		}
106	}
107}
108
109#define BUFSIZE 256
110
111int main(int argc, char **argv)
112{
113	char line[BUFSIZE], sym[BUFSIZE] = "<unknown>";
114	unsigned char insn_buf[16];
115	struct insn insn;
116	int insns = 0;
117	int warnings = 0;
118
119	parse_args(argc, argv);
120
121	while (fgets(line, BUFSIZE, stdin)) {
122		char copy[BUFSIZE], *s, *tab1, *tab2;
123		int nb = 0;
124		unsigned int b;
125
126		if (line[0] == '<') {
127			/* Symbol line */
128			strcpy(sym, line);
129			continue;
130		}
131
132		insns++;
133		memset(insn_buf, 0, 16);
134		strcpy(copy, line);
135		tab1 = strchr(copy, '\t');
136		if (!tab1)
137			malformed_line(line, insns);
138		s = tab1 + 1;
139		s += strspn(s, " ");
140		tab2 = strchr(s, '\t');
141		if (!tab2)
142			malformed_line(line, insns);
143		*tab2 = '\0';	/* Characters beyond tab2 aren't examined */
144		while (s < tab2) {
145			if (sscanf(s, "%x", &b) == 1) {
146				insn_buf[nb++] = (unsigned char) b;
147				s += 3;
148			} else
149				break;
150		}
151		/* Decode an instruction */
152		insn_init(&insn, insn_buf, x86_64);
153		insn_get_length(&insn);
154		if (insn.length != nb) {
155			warnings++;
156			fprintf(stderr, "Warning: %s found difference at %s\n",
157				prog, sym);
158			fprintf(stderr, "Warning: %s", line);
159			fprintf(stderr, "Warning: objdump says %d bytes, but "
160				"insn_get_length() says %d\n", nb,
161				insn.length);
162			if (verbose)
163				dump_insn(stderr, &insn);
164		}
165	}
166	if (warnings)
167		fprintf(stderr, "Warning: decoded and checked %d"
168			" instructions with %d warnings\n", insns, warnings);
169	else
170		fprintf(stderr, "Succeed: decoded and checked %d"
171			" instructions\n", insns);
172	return 0;
173}