diff options
Diffstat (limited to 'ndisasm.c')
| -rw-r--r-- | ndisasm.c | 473 |
1 files changed, 247 insertions, 226 deletions
@@ -18,24 +18,24 @@ #include "sync.h" #include "disasm.h" -#define BPL 8 /* bytes per line of hex dump */ +#define BPL 8 /* bytes per line of hex dump */ static const char *help = -"usage: ndisasm [-a] [-i] [-h] [-r] [-u] [-b bits] [-o origin] [-s sync...]\n" -" [-e bytes] [-k start,bytes] [-p vendor] file\n" -" -a or -i activates auto (intelligent) sync\n" -" -u sets USE32 (32-bit mode)\n" -" -b 16 or -b 32 sets number of bits too\n" -" -h displays this text\n" -" -r or -v displays the version number\n" -" -e skips <bytes> bytes of header\n" -" -k avoids disassembling <bytes> bytes from position <start>\n" -" -p selects the preferred vendor instruction set (intel, amd, cyrix, idt)\n"; + "usage: ndisasm [-a] [-i] [-h] [-r] [-u] [-b bits] [-o origin] [-s sync...]\n" + " [-e bytes] [-k start,bytes] [-p vendor] file\n" + " -a or -i activates auto (intelligent) sync\n" + " -u sets USE32 (32-bit mode)\n" + " -b 16 or -b 32 sets number of bits too\n" + " -h displays this text\n" + " -r or -v displays the version number\n" + " -e skips <bytes> bytes of header\n" + " -k avoids disassembling <bytes> bytes from position <start>\n" + " -p selects the preferred vendor instruction set (intel, amd, cyrix, idt)\n"; -static void output_ins (unsigned long, unsigned char *, int, char *); -static void skip (unsigned long dist, FILE *fp); +static void output_ins(unsigned long, unsigned char *, int, char *); +static void skip(unsigned long dist, FILE * fp); -int main(int argc, char **argv) +int main(int argc, char **argv) { unsigned char buffer[INSN_MAX * 2], *p, *q; char outbuf[256]; @@ -56,163 +56,181 @@ int main(int argc, char **argv) init_sync(); while (--argc) { - char *v, *vv, *p = *++argv; - if (*p == '-' && p[1]) { - p++; - while (*p) switch (tolower(*p)) { - case 'a': /* auto or intelligent sync */ - case 'i': - autosync = TRUE; - p++; - break; - case 'h': - fprintf(stderr, help); - return 0; - case 'r': - case 'v': - fprintf(stderr, "NDISASM version %s compiled " __DATE__ "\n", NASM_VER); - return 0; - case 'u': /* USE32 */ - bits = 32; - p++; - break; - case 'b': /* bits */ - v = p[1] ? p+1 : --argc ? *++argv : NULL; - if (!v) { - fprintf(stderr, "%s: `-b' requires an argument\n", pname); - return 1; - } - if (!strcmp(v, "16")) - bits = 16; - else if (!strcmp(v, "32")) - bits = 32; - else { - fprintf(stderr, "%s: argument to `-b' should" - " be `16' or `32'\n", pname); - } - p = ""; /* force to next argument */ - break; - case 'o': /* origin */ - v = p[1] ? p+1 : --argc ? *++argv : NULL; - if (!v) { - fprintf(stderr, "%s: `-o' requires an argument\n", pname); - return 1; - } - offset = readnum (v, &rn_error); - if (rn_error) { - fprintf(stderr, "%s: `-o' requires a numeric argument\n", - pname); - return 1; - } - p = ""; /* force to next argument */ - break; - case 's': /* sync point */ - v = p[1] ? p+1 : --argc ? *++argv : NULL; - if (!v) { - fprintf(stderr, "%s: `-s' requires an argument\n", pname); - return 1; - } - add_sync (readnum (v, &rn_error), 0L); - if (rn_error) { - fprintf(stderr, "%s: `-s' requires a numeric argument\n", - pname); - return 1; - } - p = ""; /* force to next argument */ - break; - case 'e': /* skip a header */ - v = p[1] ? p+1 : --argc ? *++argv : NULL; - if (!v) { - fprintf(stderr, "%s: `-e' requires an argument\n", pname); - return 1; - } - initskip = readnum (v, &rn_error); - if (rn_error) { - fprintf(stderr, "%s: `-e' requires a numeric argument\n", - pname); - return 1; - } - p = ""; /* force to next argument */ - break; - case 'k': /* skip a region */ - v = p[1] ? p+1 : --argc ? *++argv : NULL; - if (!v) { - fprintf(stderr, "%s: `-k' requires an argument\n", pname); - return 1; - } - vv = strchr(v, ','); - if (!vv) { - fprintf(stderr, "%s: `-k' requires two numbers separated" - " by a comma\n", pname); - return 1; - } - *vv++ = '\0'; - nextsync = readnum (v, &rn_error); - if (rn_error) { - fprintf(stderr, "%s: `-k' requires numeric arguments\n", - pname); - return 1; - } - synclen = readnum (vv, &rn_error); - if (rn_error) { - fprintf(stderr, "%s: `-k' requires numeric arguments\n", - pname); - return 1; - } - add_sync (nextsync, synclen); - p = ""; /* force to next argument */ - break; - case 'p': /* preferred vendor */ - v = p[1] ? p+1 : --argc ? *++argv : NULL; - if (!v) { - fprintf(stderr, "%s: `-p' requires an argument\n", pname); - return 1; - } - if ( !strcmp(v, "intel") ) { - prefer = 0; /* Default */ - } else if ( !strcmp(v, "amd") ) { - prefer = IF_AMD|IF_3DNOW; - } else if ( !strcmp(v, "cyrix") ) { - prefer = IF_CYRIX|IF_3DNOW; - } else if ( !strcmp(v, "idt") || !strcmp(v, "centaur") || - !strcmp(v, "winchip") ) { - prefer = IF_3DNOW; - } else { - fprintf(stderr, "%s: unknown vendor `%s' specified with `-p'\n", pname, v); - return 1; - } - p = ""; /* force to next argument */ - break; - default: /*bf*/ - fprintf(stderr, "%s: unrecognised option `-%c'\n", - pname, *p); - return 1; - } - } else if (!filename) { - filename = p; - } else { - fprintf(stderr, "%s: more than one filename specified\n", pname); - return 1; - } + char *v, *vv, *p = *++argv; + if (*p == '-' && p[1]) { + p++; + while (*p) + switch (tolower(*p)) { + case 'a': /* auto or intelligent sync */ + case 'i': + autosync = TRUE; + p++; + break; + case 'h': + fprintf(stderr, help); + return 0; + case 'r': + case 'v': + fprintf(stderr, + "NDISASM version %s compiled " __DATE__ "\n", + NASM_VER); + return 0; + case 'u': /* USE32 */ + bits = 32; + p++; + break; + case 'b': /* bits */ + v = p[1] ? p + 1 : --argc ? *++argv : NULL; + if (!v) { + fprintf(stderr, "%s: `-b' requires an argument\n", + pname); + return 1; + } + if (!strcmp(v, "16")) + bits = 16; + else if (!strcmp(v, "32")) + bits = 32; + else { + fprintf(stderr, "%s: argument to `-b' should" + " be `16' or `32'\n", pname); + } + p = ""; /* force to next argument */ + break; + case 'o': /* origin */ + v = p[1] ? p + 1 : --argc ? *++argv : NULL; + if (!v) { + fprintf(stderr, "%s: `-o' requires an argument\n", + pname); + return 1; + } + offset = readnum(v, &rn_error); + if (rn_error) { + fprintf(stderr, + "%s: `-o' requires a numeric argument\n", + pname); + return 1; + } + p = ""; /* force to next argument */ + break; + case 's': /* sync point */ + v = p[1] ? p + 1 : --argc ? *++argv : NULL; + if (!v) { + fprintf(stderr, "%s: `-s' requires an argument\n", + pname); + return 1; + } + add_sync(readnum(v, &rn_error), 0L); + if (rn_error) { + fprintf(stderr, + "%s: `-s' requires a numeric argument\n", + pname); + return 1; + } + p = ""; /* force to next argument */ + break; + case 'e': /* skip a header */ + v = p[1] ? p + 1 : --argc ? *++argv : NULL; + if (!v) { + fprintf(stderr, "%s: `-e' requires an argument\n", + pname); + return 1; + } + initskip = readnum(v, &rn_error); + if (rn_error) { + fprintf(stderr, + "%s: `-e' requires a numeric argument\n", + pname); + return 1; + } + p = ""; /* force to next argument */ + break; + case 'k': /* skip a region */ + v = p[1] ? p + 1 : --argc ? *++argv : NULL; + if (!v) { + fprintf(stderr, "%s: `-k' requires an argument\n", + pname); + return 1; + } + vv = strchr(v, ','); + if (!vv) { + fprintf(stderr, + "%s: `-k' requires two numbers separated" + " by a comma\n", pname); + return 1; + } + *vv++ = '\0'; + nextsync = readnum(v, &rn_error); + if (rn_error) { + fprintf(stderr, + "%s: `-k' requires numeric arguments\n", + pname); + return 1; + } + synclen = readnum(vv, &rn_error); + if (rn_error) { + fprintf(stderr, + "%s: `-k' requires numeric arguments\n", + pname); + return 1; + } + add_sync(nextsync, synclen); + p = ""; /* force to next argument */ + break; + case 'p': /* preferred vendor */ + v = p[1] ? p + 1 : --argc ? *++argv : NULL; + if (!v) { + fprintf(stderr, "%s: `-p' requires an argument\n", + pname); + return 1; + } + if (!strcmp(v, "intel")) { + prefer = 0; /* Default */ + } else if (!strcmp(v, "amd")) { + prefer = IF_AMD | IF_3DNOW; + } else if (!strcmp(v, "cyrix")) { + prefer = IF_CYRIX | IF_3DNOW; + } else if (!strcmp(v, "idt") || !strcmp(v, "centaur") + || !strcmp(v, "winchip")) { + prefer = IF_3DNOW; + } else { + fprintf(stderr, + "%s: unknown vendor `%s' specified with `-p'\n", + pname, v); + return 1; + } + p = ""; /* force to next argument */ + break; + default: /*bf */ + fprintf(stderr, "%s: unrecognised option `-%c'\n", + pname, *p); + return 1; + } + } else if (!filename) { + filename = p; + } else { + fprintf(stderr, "%s: more than one filename specified\n", + pname); + return 1; + } } if (!filename) { - fprintf(stderr, help, pname); - return 0; + fprintf(stderr, help, pname); + return 0; } if (strcmp(filename, "-")) { - fp = fopen(filename, "rb"); - if (!fp) { - fprintf(stderr, "%s: unable to open `%s': %s\n", - pname, filename, strerror(errno)); - return 1; - } + fp = fopen(filename, "rb"); + if (!fp) { + fprintf(stderr, "%s: unable to open `%s': %s\n", + pname, filename, strerror(errno)); + return 1; + } } else - fp = stdin; + fp = stdin; if (initskip > 0) - skip (initskip, fp); + skip(initskip, fp); /* * This main loop is really horrible, and wants rewriting with @@ -221,76 +239,79 @@ int main(int argc, char **argv) */ p = q = buffer; - nextsync = next_sync (offset, &synclen); + nextsync = next_sync(offset, &synclen); do { - unsigned long to_read = buffer+sizeof(buffer)-p; - if (to_read > nextsync-offset-(p-q)) - to_read = nextsync-offset-(p-q); - if (to_read) { - lenread = fread (p, 1, to_read, fp); - if (lenread == 0) - eof = TRUE; /* help along systems with bad feof */ - } else - lenread = 0; - p += lenread; - if ((unsigned long)offset == nextsync) { - if (synclen) { - fprintf(stdout, "%08lX skipping 0x%lX bytes\n", offset, synclen); - offset += synclen; - skip (synclen, fp); - } - p = q = buffer; - nextsync = next_sync (offset, &synclen); - } - while (p > q && (p - q >= INSN_MAX || lenread == 0)) { - lendis = disasm (q, outbuf, sizeof(outbuf), bits, offset, autosync, prefer); - if (!lendis || lendis > (p - q) || - (unsigned long)lendis > nextsync-offset) - lendis = eatbyte (q, outbuf, sizeof(outbuf)); - output_ins (offset, q, lendis, outbuf); - q += lendis; - offset += lendis; - } - if (q >= buffer+INSN_MAX) { - unsigned char *r = buffer, *s = q; - int count = p - q; - while (count--) - *r++ = *s++; - p -= (q - buffer); - q = buffer; - } + unsigned long to_read = buffer + sizeof(buffer) - p; + if (to_read > nextsync - offset - (p - q)) + to_read = nextsync - offset - (p - q); + if (to_read) { + lenread = fread(p, 1, to_read, fp); + if (lenread == 0) + eof = TRUE; /* help along systems with bad feof */ + } else + lenread = 0; + p += lenread; + if ((unsigned long)offset == nextsync) { + if (synclen) { + fprintf(stdout, "%08lX skipping 0x%lX bytes\n", offset, + synclen); + offset += synclen; + skip(synclen, fp); + } + p = q = buffer; + nextsync = next_sync(offset, &synclen); + } + while (p > q && (p - q >= INSN_MAX || lenread == 0)) { + lendis = + disasm(q, outbuf, sizeof(outbuf), bits, offset, autosync, + prefer); + if (!lendis || lendis > (p - q) + || (unsigned long)lendis > nextsync - offset) + lendis = eatbyte(q, outbuf, sizeof(outbuf)); + output_ins(offset, q, lendis, outbuf); + q += lendis; + offset += lendis; + } + if (q >= buffer + INSN_MAX) { + unsigned char *r = buffer, *s = q; + int count = p - q; + while (count--) + *r++ = *s++; + p -= (q - buffer); + q = buffer; + } } while (lenread > 0 || !(eof || feof(fp))); if (fp != stdin) - fclose (fp); + fclose(fp); return 0; } -static void output_ins (unsigned long offset, unsigned char *data, - int datalen, char *insn) +static void output_ins(unsigned long offset, unsigned char *data, + int datalen, char *insn) { int bytes; fprintf(stdout, "%08lX ", offset); bytes = 0; while (datalen > 0 && bytes < BPL) { - fprintf(stdout, "%02X", *data++); - bytes++; - datalen--; + fprintf(stdout, "%02X", *data++); + bytes++; + datalen--; } - fprintf(stdout, "%*s%s\n", (BPL+1-bytes)*2, "", insn); + fprintf(stdout, "%*s%s\n", (BPL + 1 - bytes) * 2, "", insn); while (datalen > 0) { - fprintf(stdout, " -"); - bytes = 0; - while (datalen > 0 && bytes < BPL) { - fprintf(stdout, "%02X", *data++); - bytes++; - datalen--; - } - fprintf(stdout, "\n"); + fprintf(stdout, " -"); + bytes = 0; + while (datalen > 0 && bytes < BPL) { + fprintf(stdout, "%02X", *data++); + bytes++; + datalen--; + } + fprintf(stdout, "\n"); } } @@ -298,24 +319,24 @@ static void output_ins (unsigned long offset, unsigned char *data, * Skip a certain amount of data in a file, either by seeking if * possible, or if that fails then by reading and discarding. */ -static void skip (unsigned long dist, FILE *fp) +static void skip(unsigned long dist, FILE * fp) { - char buffer[256]; /* should fit on most stacks :-) */ + char buffer[256]; /* should fit on most stacks :-) */ /* * Got to be careful with fseek: at least one fseek I've tried * doesn't approve of SEEK_CUR. So I'll use SEEK_SET and * ftell... horrible but apparently necessary. */ - if (fseek (fp, dist+ftell(fp), SEEK_SET)) { - while (dist > 0) { - unsigned long len = (dist < sizeof(buffer) ? - dist : sizeof(buffer)); - if (fread (buffer, 1, len, fp) < len) { - perror("fread"); - exit(1); - } - dist -= len; - } + if (fseek(fp, dist + ftell(fp), SEEK_SET)) { + while (dist > 0) { + unsigned long len = (dist < sizeof(buffer) ? + dist : sizeof(buffer)); + if (fread(buffer, 1, len, fp) < len) { + perror("fread"); + exit(1); + } + dist -= len; + } } } |