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Beginnings of a crude utility to dump the contents of an OMF file
Beginnings of a crude utility to dump the contents of an OMF (obj) file. At this point all it does it breaks it down into the individual records and dumps those, but it is still easier to read than a pure hexdump. See http://www.azillionmonkeys.com/qed/Omfg.pdf for the format spec. Signed-off-by: H. Peter Anvin <hpa@zytor.com>
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H. Peter Anvin
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48ef41957a
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5a11f59a82
223
misc/omfdump.c
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223
misc/omfdump.c
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/*
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* omfdump.c
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*
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* Very simple program to dump the contents of an OMF (OBJ) file
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*
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* This assumes a littleendian, unaligned-load-capable host and a
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* C compiler which handles basic C99.
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*/
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#include <stdio.h>
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#include <stdlib.h>
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#include <inttypes.h>
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#include <ctype.h>
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#include <fcntl.h>
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#include <unistd.h>
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#include <sys/mman.h>
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#include <sys/stat.h>
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const char *progname;
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static const char *record_types[256] =
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{
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[0x80] = "THEADR",
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[0x82] = "LHEADR",
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[0x88] = "COMENT",
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[0x8a] = "MODEND16",
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[0x8b] = "MODEND32",
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[0x8c] = "EXTDEF",
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[0x90] = "PUBDEF16",
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[0x91] = "PUBDEF32",
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[0x94] = "LINNUM16",
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[0x95] = "LINNUM32",
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[0x96] = "LNAMES",
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[0x98] = "SEGDEF16",
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[0x99] = "SEGDEF32",
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[0x9a] = "GRPDEF",
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[0x9c] = "FIXUPP16",
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[0x9d] = "FIXUPP32",
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[0xa0] = "LEDATA16",
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[0xa1] = "LEDATA32",
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[0xa2] = "LIDATA16",
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[0xa3] = "LIDATA32",
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[0xb0] = "COMDEF",
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[0xb2] = "BAKPAT16",
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[0xb3] = "BAKPAT32",
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[0xb4] = "LEXTDEF",
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[0xb6] = "LPUBDEF16",
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[0xb7] = "LPUBDEF32",
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[0xb8] = "LCOMDEF",
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[0xbc] = "CEXTDEF",
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[0xc2] = "COMDAT16",
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[0xc3] = "COMDAT32",
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[0xc4] = "LINSYM16",
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[0xc5] = "LINSYM32",
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[0xc6] = "ALIAS",
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[0xc8] = "NBKPAT16",
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[0xc9] = "NBKPAT32",
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[0xca] = "LLNAMES",
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[0xcc] = "VERNUM",
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[0xce] = "VENDEXT",
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[0xf0] = "LIBHDR",
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[0xf1] = "LIBEND",
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};
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typedef void (*dump_func)(uint8_t, const uint8_t *, size_t);
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static void hexdump_data(unsigned int offset, const uint8_t *data, size_t n)
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{
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unsigned int i, j;
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for (i = 0; i < n; i += 16) {
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printf(" %04x: ", i+offset);
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for (j = 0; j < 16; j++) {
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if (i+j < n)
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printf("%02x%c", data[i+j], (j == 7) ? '-' : ' ');
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else
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printf(" ");
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}
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printf(" : ");
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for (j = 0; j < 16; j++) {
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if (i+j < n)
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putchar(isprint(data[i+j]) ? data[i+j] : '.');
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}
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putchar('\n');
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}
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}
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static void dump_unknown(uint8_t type, const uint8_t *data, size_t n)
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{
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(void)type;
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hexdump_data(0, data, n);
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}
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static void dump_coment(uint8_t type, const uint8_t *data, size_t n)
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{
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uint8_t class;
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static const char *coment_class[256] = {
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[0x00] = "Translator",
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[0x01] = "Copyright",
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[0x81] = "Library specifier",
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[0x9c] = "MS-DOS version",
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[0x9d] = "Memory model",
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[0x9e] = "DOSSEG",
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[0x9f] = "Library search",
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[0xa0] = "OMF extensions",
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[0xa1] = "New OMF extension",
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[0xa2] = "Link pass separator",
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[0xa3] = "LIBMOD",
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[0xa4] = "EXESTR",
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[0xa6] = "INCERR",
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[0xa7] = "NOPAD",
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[0xa8] = "WKEXT",
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[0xa9] = "LZEXT",
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[0xda] = "Comment",
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[0xdb] = "Compiler",
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[0xdc] = "Date",
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[0xdd] = "Timestamp",
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[0xdf] = "User",
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[0xe9] = "Dependency file",
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[0xff] = "Command line"
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};
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if (n < 2) {
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dump_unknown(type, data, n);
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return;
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}
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type = data[0];
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class = data[1];
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printf(" [NP=%d NL=%d UD=%02X] %02X %s\n",
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(type >> 7) & 1,
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(type >> 6) & 1,
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type & 0x3f,
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class,
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coment_class[class] ? coment_class[class] : "???");
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hexdump_data(2, data+2, n-2);
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}
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static const dump_func dump_type[256] =
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{
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[0x88] = dump_coment,
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};
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int dump_omf(int fd)
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{
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struct stat st;
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size_t len, n;
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uint8_t type;
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const uint8_t *p, *data;
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if (fstat(fd, &st))
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return -1;
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len = st.st_size;
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data = mmap(NULL, len, PROT_READ, MAP_PRIVATE, fd, 0);
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if (data == MAP_FAILED)
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return -1;
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p = data;
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while (len >= 3) {
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uint8_t csum;
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int i;
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type = p[0];
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n = *(uint16_t *)(p+1);
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printf("%02x %-10s %4zd bytes",
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type,
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record_types[type] ? record_types[type] : "???",
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n);
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if (len < n+3) {
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printf("\n (truncated, only %zd bytes left)\n", len-3);
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break; /* Truncated */
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}
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p += 3; /* Header doesn't count in the length */
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n--; /* Remove checksum byte */
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csum = 0;
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for (i = -3; i < (int)n; i++)
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csum -= p[i];
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printf(", checksum %02X", p[i]);
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if (csum == p[i])
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printf(" (valid)\n");
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else
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printf(" (actual = %02X)\n", csum);
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if (dump_type[type])
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dump_type[type](type, p, n);
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else
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dump_unknown(type, p, n);
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p += n+1;
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len -= (n+4);
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}
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munmap((void *)data, st.st_size);
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return 0;
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}
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int main(int argc, char *argv[])
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{
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int fd;
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int i;
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progname = argv[0];
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for (i = 1; i < argc; i++) {
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fd = open(argv[i], O_RDONLY);
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if (fd < 0 || dump_omf(fd)) {
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perror(argv[i]);
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return 1;
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}
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close(fd);
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}
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return 0;
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}
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