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/*
* omfdump.c
*
* Very simple program to dump the contents of an OMF (OBJ) file
*
* This assumes a littleendian, unaligned-load-capable host and a
* C compiler which handles basic C99.
*/
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <inttypes.h>
#include <ctype.h>
#include <fcntl.h>
#include <unistd.h>
#include <stdbool.h>
#include <sys/mman.h>
#include <sys/stat.h>
const char *progname;
static const char *record_types[256] =
{
[0x80] = "THEADR",
[0x82] = "LHEADR",
[0x88] = "COMENT",
[0x8a] = "MODEND16",
[0x8b] = "MODEND32",
[0x8c] = "EXTDEF",
[0x90] = "PUBDEF16",
[0x91] = "PUBDEF32",
[0x94] = "LINNUM16",
[0x95] = "LINNUM32",
[0x96] = "LNAMES",
[0x98] = "SEGDEF16",
[0x99] = "SEGDEF32",
[0x9a] = "GRPDEF",
[0x9c] = "FIXUPP16",
[0x9d] = "FIXUPP32",
[0xa0] = "LEDATA16",
[0xa1] = "LEDATA32",
[0xa2] = "LIDATA16",
[0xa3] = "LIDATA32",
[0xb0] = "COMDEF",
[0xb2] = "BAKPAT16",
[0xb3] = "BAKPAT32",
[0xb4] = "LEXTDEF",
[0xb6] = "LPUBDEF16",
[0xb7] = "LPUBDEF32",
[0xb8] = "LCOMDEF",
[0xbc] = "CEXTDEF",
[0xc2] = "COMDAT16",
[0xc3] = "COMDAT32",
[0xc4] = "LINSYM16",
[0xc5] = "LINSYM32",
[0xc6] = "ALIAS",
[0xc8] = "NBKPAT16",
[0xc9] = "NBKPAT32",
[0xca] = "LLNAMES",
[0xcc] = "VERNUM",
[0xce] = "VENDEXT",
[0xf0] = "LIBHDR",
[0xf1] = "LIBEND",
};
typedef void (*dump_func)(uint8_t, const uint8_t *, size_t);
/* Ordered collection type */
struct collection {
size_t n; /* Elements in collection (not including 0) */
size_t s; /* Elements allocated (not including 0) */
const void **p; /* Element pointers */
};
struct collection c_names, c_lsegs, c_groups, c_extsym;
static void nomem(void)
{
fprintf(stderr, "%s: memory allocation error\n", progname);
exit(1);
}
#define INIT_SIZE 64
static void add_collection(struct collection *c, const void *p)
{
if (c->n >= c->s) {
size_t cs = c->s ? (c->s << 1) : INIT_SIZE;
const void **cp = realloc(c->p, cs*sizeof(const void *));
if (!cp)
nomem();
c->p = cp;
c->s = cs;
memset(cp + c->n, 0, (cs - c->n)*sizeof(const void *));
}
c->p[++c->n] = p;
}
static const void *get_collection(struct collection *c, size_t index)
{
if (index >= c->n)
return NULL;
return c->p[index];
}
static void hexdump_data(unsigned int offset, const uint8_t *data,
size_t n, size_t field)
{
unsigned int i, j;
for (i = 0; i < n; i += 16) {
printf(" %04x: ", i+offset);
for (j = 0; j < 16; j++) {
char sep = (j == 7) ? '-' : ' ';
if (i+j < field)
printf("%02x%c", data[i+j], sep);
else if (i+j < n)
printf("xx%c", sep); /* Beyond end of... */
else
printf(" "); /* No separator */
}
printf(" : ");
for (j = 0; j < 16; j++) {
if (i+j < n)
putchar((i+j >= field) ? 'x' :
isprint(data[i+j]) ? data[i+j] : '.');
}
putchar('\n');
}
}
static void dump_unknown(uint8_t type, const uint8_t *data, size_t n)
{
(void)type;
hexdump_data(0, data, n, n);
}
static void print_dostime(const uint8_t *p)
{
uint16_t da = (p[3] << 8) + p[2];
uint16_t ti = (p[1] << 8) + p[0];
printf("%04u-%02u-%02u %02u:%02u:%02u",
(da >> 9) + 1980, (da >> 5) & 15, da & 31,
(ti >> 11), (ti >> 5) & 63, (ti << 1) & 63);
}
static void dump_coment_depfile(uint8_t type, const uint8_t *data, size_t n)
{
if (n > 4 && data[4] == n-5) {
printf(" # ");
print_dostime(data);
printf(" %.*s\n", n-5, data+5);
}
hexdump_data(2, data, n, n);
}
static const dump_func dump_coment_class[256] = {
[0xe9] = dump_coment_depfile
};
static void dump_coment(uint8_t type, const uint8_t *data, size_t n)
{
uint8_t class;
static const char *coment_class[256] = {
[0x00] = "Translator",
[0x01] = "Copyright",
[0x81] = "Library specifier",
[0x9c] = "MS-DOS version",
[0x9d] = "Memory model",
[0x9e] = "DOSSEG",
[0x9f] = "Library search",
[0xa0] = "OMF extensions",
[0xa1] = "New OMF extension",
[0xa2] = "Link pass separator",
[0xa3] = "LIBMOD",
[0xa4] = "EXESTR",
[0xa6] = "INCERR",
[0xa7] = "NOPAD",
[0xa8] = "WKEXT",
[0xa9] = "LZEXT",
[0xda] = "Comment",
[0xdb] = "Compiler",
[0xdc] = "Date",
[0xdd] = "Timestamp",
[0xdf] = "User",
[0xe3] = "Type definition",
[0xe8] = "Filename",
[0xe9] = "Dependency file",
[0xff] = "Command line"
};
if (n < 2) {
hexdump_data(type, data, 2, n);
return;
}
type = data[0];
class = data[1];
printf(" [NP=%d NL=%d UD=%02X] %02X %s\n",
(type >> 7) & 1,
(type >> 6) & 1,
type & 0x3f,
class,
coment_class[class] ? coment_class[class] : "???");
if (dump_coment_class[class])
dump_coment_class[class](class, data+2, n-2);
else
hexdump_data(2, data+2, n-2, n-2);
}
/* Parse an index field */
static uint16_t get_index(const uint8_t **pp)
{
uint8_t c;
c = *(*pp)++;
if (c & 0x80) {
return ((c & 0x7f) << 8) + *(*pp)++;
} else {
return c;
}
}
static uint16_t get_16(const uint8_t **pp)
{
uint16_t v = *(const uint16_t *)(*pp);
(*pp) += 2;
return v;
}
static uint32_t get_32(const uint8_t **pp)
{
const uint32_t v = *(const uint32_t *)(*pp);
(*pp) += 4;
return v;
}
/* Returns a name as a C string in a newly allocated buffer */
char *lname(int index)
{
char *s;
const char *p = get_collection(&c_names, index);
size_t len;
if (!p)
return NULL;
len = (uint8_t)p[0];
s = malloc(len+1);
if (!s)
nomem();
memcpy(s, p+1, len);
s[len] = '\0';
return s;
}
/* LNAMES or LLNAMES */
static void dump_lnames(uint8_t type, const uint8_t *data, size_t n)
{
const uint8_t *p = data;
const uint8_t *end = data + n;
while (p < end) {
size_t l = *p+1;
if (l > n) {
add_collection(&c_names, NULL);
printf(" # %4u 0x%04x: \"%.*s... <%zu missing bytes>\n",
c_names.n, c_names.n, n-1, p+1, l-n);
} else {
add_collection(&c_names, p);
printf(" # %4u 0x%04x: \"%.*s\"\n",
c_names.n, c_names.n, l-1, p+1);
}
hexdump_data(p-data, p, l, n);
p += l;
n -= l;
}
}
/* SEGDEF16 or SEGDEF32 */
static void dump_segdef(uint8_t type, const uint8_t *data, size_t n)
{
bool big = type & 1;
const uint8_t *p = data;
const uint8_t *end = data+n;
uint8_t attr;
static const char * const alignment[8] =
{ "ABS", "BYTE", "WORD", "PARA", "PAGE", "DWORD", "LTL", "?ALIGN" };
static const char * const combine[8] =
{ "PRIVATE", "?COMMON", "PUBLIC", "?COMBINE", "?PUBLIC", "STACK", "COMMON", "?PUBLIC" };
uint16_t idx;
char *s;
if (p >= end)
return;
attr = *p++;
printf(" # %s (A%u) %s (C%u) %s%s",
alignment[(attr >> 5) & 7], (attr >> 5) & 7,
combine[(attr >> 2) & 7], (attr >> 2) & 7,
(attr & 0x02) ? "MAXSIZE " : "",
(attr & 0x01) ? "USE32" : "USE16");
if (((attr >> 5) & 7) == 0) {
/* Absolute segment */
if (p+3 > end)
goto dump;
printf(" AT %04x:", get_16(&p));
printf("%02x", *p++);
}
if (big) {
if (p+4 > end)
goto dump;
printf(" size 0x%08x", get_32(&p));
} else {
if (p+2 > end)
goto dump;
printf(" size 0x%04x", get_16(&p));
}
idx = get_index(&p);
if (p > end)
goto dump;
s = lname(idx);
printf(" name '%s'", s);
idx = get_index(&p);
if (p > end)
goto dump;
s = lname(idx);
printf(" class '%s'", s);
idx = get_index(&p);
if (p > end)
goto dump;
s = lname(idx);
printf(" ovl '%s'", s);
dump:
putchar('\n');
hexdump_data(0, data, n, n);
}
/* FIXUPP16 or FIXUPP32 */
static void dump_fixupp(uint8_t type, const uint8_t *data, size_t n)
{
bool big = type & 1;
const uint8_t *p = data;
const uint8_t *end = data + n;
static const char * const method_base[4] =
{ "SEGDEF", "GRPDEF", "EXTDEF", "frame#" };
while (p < end) {
const uint8_t *start = p;
uint8_t op = *p++;
uint16_t index;
uint32_t disp;
if (!(op & 0x80)) {
/* THREAD record */
bool frame = !!(op & 0x40);
printf(" THREAD %-7s%d%s method %c%d (%s)",
frame ? "frame" : "target", op & 3,
(op & 0x20) ? " +flag5?" : "",
(op & 0x40) ? 'F' : 'T',
op & 3, method_base[op & 3]);
if ((op & 0x50) != 0x50) {
printf(" index 0x%04x", get_index(&p));
}
putchar('\n');
} else {
/* FIXUP subrecord */
uint8_t fix;
printf(" FIXUP %s-rel location %2d offset 0x%03x",
(op & 0x40) ? "seg" : "self",
(op & 0x3c) >> 2,
((op & 3) << 8) + *p++);
fix = *p++;
printf("\n frame %s%d%s",
(fix & 0x80) ? "thread " : "F",
((fix & 0x70) >> 4),
((fix & 0xc0) == 0xc0) ? "?" : "");
if ((fix & 0xc0) == 0)
printf(" datum 0x%04x", get_index(&p));
printf("\n target %s%d",
(fix & 0x10) ? "thread " : "method T",
fix & 3);
if ((fix & 0x10) == 0)
printf(" (%s)", method_base[fix & 3]);
printf(" datum 0x%04x", get_index(&p));
if ((fix & 0x08) == 0) {
if (big) {
printf(" disp 0x%08x", get_32(&p));
} else {
printf(" disp 0x%04x", get_16(&p));
}
}
putchar('\n');
}
hexdump_data(start-data, start, p-start, n-(start-data));
}
}
static const dump_func dump_type[256] =
{
[0x88] = dump_coment,
[0x96] = dump_lnames,
[0x98] = dump_segdef,
[0x99] = dump_segdef,
[0x9c] = dump_fixupp,
[0x9d] = dump_fixupp,
[0xca] = dump_lnames,
};
int dump_omf(int fd)
{
struct stat st;
size_t len, n;
uint8_t type;
const uint8_t *p, *data;
if (fstat(fd, &st))
return -1;
len = st.st_size;
data = mmap(NULL, len, PROT_READ, MAP_PRIVATE, fd, 0);
if (data == MAP_FAILED)
return -1;
p = data;
while (len >= 3) {
uint8_t csum;
int i;
type = p[0];
n = *(uint16_t *)(p+1);
printf("%02x %-10s %4zd bytes",
type,
record_types[type] ? record_types[type] : "???",
n);
if (len < n+3) {
printf("\n (truncated, only %zd bytes left)\n", len-3);
break; /* Truncated */
}
p += 3; /* Header doesn't count in the length */
n--; /* Remove checksum byte */
csum = 0;
for (i = -3; i < (int)n; i++)
csum -= p[i];
printf(", checksum %02X", p[i]);
if (csum == p[i])
printf(" (valid)\n");
else
printf(" (actual = %02X)\n", csum);
if (dump_type[type])
dump_type[type](type, p, n);
else
dump_unknown(type, p, n);
p += n+1;
len -= (n+4);
}
munmap((void *)data, st.st_size);
return 0;
}
int main(int argc, char *argv[])
{
int fd;
int i;
progname = argv[0];
for (i = 1; i < argc; i++) {
fd = open(argv[i], O_RDONLY);
if (fd < 0 || dump_omf(fd)) {
perror(argv[i]);
return 1;
}
close(fd);
}
return 0;
}
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