1 /* ----------------------------------------------------------------------- *
3 * Copyright 1996-2009 The NASM Authors - All Rights Reserved
4 * See the file AUTHORS included with the NASM distribution for
5 * the specific copyright holders.
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following
11 * * Redistributions of source code must retain the above copyright
12 * notice, this list of conditions and the following disclaimer.
13 * * Redistributions in binary form must reproduce the above
14 * copyright notice, this list of conditions and the following
15 * disclaimer in the documentation and/or other materials provided
16 * with the distribution.
18 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND
19 * CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES,
20 * INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
21 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
22 * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
23 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
24 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
25 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
26 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
27 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
28 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
29 * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE,
30 * EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
32 * ----------------------------------------------------------------------- */
35 * ndisasm.c the Netwide Disassembler main module
54 #define BPL 8 /* bytes per line of hex dump */
56 static const char *help =
57 "usage: ndisasm [-a] [-i] [-h] [-r] [-u] [-b bits] [-o origin] [-s sync...]\n"
58 " [-e bytes] [-k start,bytes] [-p vendor] file\n"
59 " -a or -i activates auto (intelligent) sync\n"
61 " -b 16, -b 32 or -b 64 sets the processor mode\n"
62 " -h displays this text\n"
63 " -r or -v displays the version number\n"
64 " -e skips <bytes> bytes of header\n"
65 " -k avoids disassembling <bytes> bytes from position <start>\n"
66 " -p selects the preferred vendor instruction set (intel, amd, cyrix, idt)\n";
68 static void output_ins(uint32_t, uint8_t *, int, char *);
69 static void skip(uint32_t dist, FILE * fp);
71 static void ndisasm_verror(int severity, const char *fmt, va_list va)
73 vfprintf(stderr, fmt, va);
75 if (severity & ERR_FATAL)
79 int main(int argc, char **argv)
81 char buffer[INSN_MAX * 2], *p, *ep, *q;
84 char *filename = NULL;
85 uint32_t nextsync, synclen, initskip = 0L;
88 bool autosync = false;
97 nasm_set_verror(ndisasm_verror);
98 nasm_init_malloc_error();
104 char *v, *vv, *p = *++argv;
105 if (*p == '-' && p[1]) {
108 switch (nasm_tolower(*p)) {
109 case 'a': /* auto or intelligent sync */
120 "NDISASM version %s compiled on %s\n",
121 nasm_version, nasm_date);
123 case 'u': /* -u for -b 32, -uu for -b 64 */
129 v = p[1] ? p + 1 : --argc ? *++argv : NULL;
131 fprintf(stderr, "%s: `-b' requires an argument\n",
135 b = strtoul(v, &ep, 10);
136 if (*ep || !(bits == 16 || bits == 32 || bits == 64)) {
137 fprintf(stderr, "%s: argument to `-b' should"
138 " be 16, 32 or 64\n", pname);
142 p = ""; /* force to next argument */
144 case 'o': /* origin */
145 v = p[1] ? p + 1 : --argc ? *++argv : NULL;
147 fprintf(stderr, "%s: `-o' requires an argument\n",
151 offset = readnum(v, &rn_error);
154 "%s: `-o' requires a numeric argument\n",
158 p = ""; /* force to next argument */
160 case 's': /* sync point */
161 v = p[1] ? p + 1 : --argc ? *++argv : NULL;
163 fprintf(stderr, "%s: `-s' requires an argument\n",
167 add_sync(readnum(v, &rn_error), 0L);
170 "%s: `-s' requires a numeric argument\n",
174 p = ""; /* force to next argument */
176 case 'e': /* skip a header */
177 v = p[1] ? p + 1 : --argc ? *++argv : NULL;
179 fprintf(stderr, "%s: `-e' requires an argument\n",
183 initskip = readnum(v, &rn_error);
186 "%s: `-e' requires a numeric argument\n",
190 p = ""; /* force to next argument */
192 case 'k': /* skip a region */
193 v = p[1] ? p + 1 : --argc ? *++argv : NULL;
195 fprintf(stderr, "%s: `-k' requires an argument\n",
202 "%s: `-k' requires two numbers separated"
203 " by a comma\n", pname);
207 nextsync = readnum(v, &rn_error);
210 "%s: `-k' requires numeric arguments\n",
214 synclen = readnum(vv, &rn_error);
217 "%s: `-k' requires numeric arguments\n",
221 add_sync(nextsync, synclen);
222 p = ""; /* force to next argument */
224 case 'p': /* preferred vendor */
225 v = p[1] ? p + 1 : --argc ? *++argv : NULL;
227 fprintf(stderr, "%s: `-p' requires an argument\n",
231 if (!strcmp(v, "intel")) {
232 prefer = 0; /* Default */
233 } else if (!strcmp(v, "amd")) {
234 prefer = IF_AMD | IF_3DNOW;
235 } else if (!strcmp(v, "cyrix")) {
236 prefer = IF_CYRIX | IF_3DNOW;
237 } else if (!strcmp(v, "idt") || !strcmp(v, "centaur")
238 || !strcmp(v, "winchip")) {
242 "%s: unknown vendor `%s' specified with `-p'\n",
246 p = ""; /* force to next argument */
249 fprintf(stderr, "%s: unrecognised option `-%c'\n",
253 } else if (!filename) {
256 fprintf(stderr, "%s: more than one filename specified\n",
263 fprintf(stderr, help, pname);
267 if (strcmp(filename, "-")) {
268 fp = fopen(filename, "rb");
270 fprintf(stderr, "%s: unable to open `%s': %s\n",
271 pname, filename, strerror(errno));
281 * This main loop is really horrible, and wants rewriting with
282 * an axe. It'll stay the way it is for a while though, until I
287 nextsync = next_sync(offset, &synclen);
289 uint32_t to_read = buffer + sizeof(buffer) - p;
290 if ((nextsync || synclen) &&
291 to_read > nextsync - offset - (p - q))
292 to_read = nextsync - offset - (p - q);
294 lenread = fread(p, 1, to_read, fp);
296 eof = true; /* help along systems with bad feof */
300 if ((nextsync || synclen) &&
301 (uint32_t)offset == nextsync) {
303 fprintf(stdout, "%08"PRIX32" skipping 0x%"PRIX32" bytes\n",
309 nextsync = next_sync(offset, &synclen);
311 while (p > q && (p - q >= INSN_MAX || lenread == 0)) {
313 disasm((uint8_t *) q, outbuf, sizeof(outbuf), bits,
314 offset, autosync, prefer);
315 if (!lendis || lendis > (p - q)
316 || ((nextsync || synclen) &&
317 (uint32_t)lendis > nextsync - offset))
318 lendis = eatbyte((uint8_t *) q, outbuf, sizeof(outbuf), bits);
319 output_ins(offset, (uint8_t *) q, lendis, outbuf);
323 if (q >= buffer + INSN_MAX) {
324 uint8_t *r = (uint8_t *) buffer, *s = (uint8_t *) q;
331 } while (lenread > 0 || !(eof || feof(fp)));
339 static void output_ins(uint32_t offset, uint8_t *data,
340 int datalen, char *insn)
343 fprintf(stdout, "%08"PRIX32" ", offset);
346 while (datalen > 0 && bytes < BPL) {
347 fprintf(stdout, "%02X", *data++);
352 fprintf(stdout, "%*s%s\n", (BPL + 1 - bytes) * 2, "", insn);
354 while (datalen > 0) {
355 fprintf(stdout, " -");
357 while (datalen > 0 && bytes < BPL) {
358 fprintf(stdout, "%02X", *data++);
362 fprintf(stdout, "\n");
367 * Skip a certain amount of data in a file, either by seeking if
368 * possible, or if that fails then by reading and discarding.
370 static void skip(uint32_t dist, FILE * fp)
372 char buffer[256]; /* should fit on most stacks :-) */
375 * Got to be careful with fseek: at least one fseek I've tried
376 * doesn't approve of SEEK_CUR. So I'll use SEEK_SET and
377 * ftell... horrible but apparently necessary.
379 if (fseek(fp, dist + ftell(fp), SEEK_SET)) {
381 uint32_t len = (dist < sizeof(buffer) ?
382 dist : sizeof(buffer));
383 if (fread(buffer, 1, len, fp) < len) {