mirror of
https://github.com/netwide-assembler/nasm.git
synced 2024-12-21 09:19:31 +08:00
518 lines
11 KiB
C
518 lines
11 KiB
C
/*
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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 <stdbool.h>
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#include <string.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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/* Ordered collection type */
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struct collection {
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size_t n; /* Elements in collection (not including 0) */
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size_t s; /* Elements allocated (not including 0) */
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const void **p; /* Element pointers */
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};
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struct collection c_names, c_lsegs, c_groups, c_extsym;
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static void nomem(void)
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{
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fprintf(stderr, "%s: memory allocation error\n", progname);
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exit(1);
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}
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#define INIT_SIZE 64
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static void add_collection(struct collection *c, const void *p)
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{
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if (c->n >= c->s) {
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size_t cs = c->s ? (c->s << 1) : INIT_SIZE;
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const void **cp = realloc(c->p, cs*sizeof(const void *));
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if (!cp)
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nomem();
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c->p = cp;
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c->s = cs;
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memset(cp + c->n, 0, (cs - c->n)*sizeof(const void *));
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}
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c->p[++c->n] = p;
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}
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static const void *get_collection(struct collection *c, size_t index)
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{
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if (index >= c->n)
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return NULL;
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return c->p[index];
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}
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static void hexdump_data(unsigned int offset, const uint8_t *data,
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size_t n, size_t field)
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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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char sep = (j == 7) ? '-' : ' ';
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if (i+j < field)
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printf("%02x%c", data[i+j], sep);
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else if (i+j < n)
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printf("xx%c", sep); /* Beyond end of... */
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else
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printf(" "); /* No separator */
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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((i+j >= field) ? 'x' :
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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, n);
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}
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static void print_dostime(const uint8_t *p)
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{
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uint16_t da = (p[3] << 8) + p[2];
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uint16_t ti = (p[1] << 8) + p[0];
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printf("%04u-%02u-%02u %02u:%02u:%02u",
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(da >> 9) + 1980, (da >> 5) & 15, da & 31,
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(ti >> 11), (ti >> 5) & 63, (ti << 1) & 63);
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}
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static void dump_coment_depfile(uint8_t type, const uint8_t *data, size_t n)
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{
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if (n > 4 && data[4] == n-5) {
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printf(" # ");
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print_dostime(data);
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printf(" %.*s\n", n-5, data+5);
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}
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hexdump_data(2, data, n, n);
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}
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static const dump_func dump_coment_class[256] = {
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[0xe9] = dump_coment_depfile
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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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[0xe3] = "Type definition",
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[0xe8] = "Filename",
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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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hexdump_data(type, data, 2, 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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if (dump_coment_class[class])
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dump_coment_class[class](class, data+2, n-2);
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else
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hexdump_data(2, data+2, n-2, n-2);
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}
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/* Parse an index field */
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static uint16_t get_index(const uint8_t **pp)
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{
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uint8_t c;
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c = *(*pp)++;
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if (c & 0x80) {
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return ((c & 0x7f) << 8) + *(*pp)++;
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} else {
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return c;
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}
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}
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static uint16_t get_16(const uint8_t **pp)
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{
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uint16_t v = *(const uint16_t *)(*pp);
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(*pp) += 2;
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return v;
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}
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static uint32_t get_32(const uint8_t **pp)
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{
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const uint32_t v = *(const uint32_t *)(*pp);
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(*pp) += 4;
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return v;
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}
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/* Returns a name as a C string in a newly allocated buffer */
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char *lname(int index)
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{
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char *s;
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const char *p = get_collection(&c_names, index);
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size_t len;
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if (!p)
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return NULL;
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len = (uint8_t)p[0];
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s = malloc(len+1);
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if (!s)
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nomem();
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memcpy(s, p+1, len);
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s[len] = '\0';
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return s;
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}
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/* LNAMES or LLNAMES */
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static void dump_lnames(uint8_t type, const uint8_t *data, size_t n)
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{
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const uint8_t *p = data;
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const uint8_t *end = data + n;
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while (p < end) {
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size_t l = *p+1;
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if (l > n) {
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add_collection(&c_names, NULL);
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printf(" # %4u 0x%04x: \"%.*s... <%zu missing bytes>\n",
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c_names.n, c_names.n, n-1, p+1, l-n);
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} else {
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add_collection(&c_names, p);
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printf(" # %4u 0x%04x: \"%.*s\"\n",
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c_names.n, c_names.n, l-1, p+1);
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}
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hexdump_data(p-data, p, l, n);
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p += l;
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n -= l;
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}
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}
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/* SEGDEF16 or SEGDEF32 */
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static void dump_segdef(uint8_t type, const uint8_t *data, size_t n)
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{
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bool big = type & 1;
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const uint8_t *p = data;
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const uint8_t *end = data+n;
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uint8_t attr;
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static const char * const alignment[8] =
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{ "ABS", "BYTE", "WORD", "PARA", "PAGE", "DWORD", "LTL", "?ALIGN" };
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static const char * const combine[8] =
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{ "PRIVATE", "?COMMON", "PUBLIC", "?COMBINE", "?PUBLIC", "STACK", "COMMON", "?PUBLIC" };
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uint16_t idx;
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char *s;
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if (p >= end)
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return;
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attr = *p++;
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printf(" # %s (A%u) %s (C%u) %s%s",
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alignment[(attr >> 5) & 7], (attr >> 5) & 7,
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combine[(attr >> 2) & 7], (attr >> 2) & 7,
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(attr & 0x02) ? "MAXSIZE " : "",
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(attr & 0x01) ? "USE32" : "USE16");
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if (((attr >> 5) & 7) == 0) {
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/* Absolute segment */
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if (p+3 > end)
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goto dump;
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printf(" AT %04x:", get_16(&p));
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printf("%02x", *p++);
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}
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if (big) {
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if (p+4 > end)
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goto dump;
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printf(" size 0x%08x", get_32(&p));
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} else {
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if (p+2 > end)
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goto dump;
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printf(" size 0x%04x", get_16(&p));
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}
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idx = get_index(&p);
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if (p > end)
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goto dump;
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s = lname(idx);
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printf(" name '%s'", s);
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idx = get_index(&p);
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if (p > end)
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goto dump;
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s = lname(idx);
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printf(" class '%s'", s);
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idx = get_index(&p);
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if (p > end)
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goto dump;
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s = lname(idx);
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printf(" ovl '%s'", s);
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dump:
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putchar('\n');
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hexdump_data(0, data, n, n);
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}
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/* FIXUPP16 or FIXUPP32 */
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static void dump_fixupp(uint8_t type, const uint8_t *data, size_t n)
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{
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bool big = type & 1;
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const uint8_t *p = data;
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const uint8_t *end = data + n;
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static const char * const method_base[4] =
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{ "SEGDEF", "GRPDEF", "EXTDEF", "frame#" };
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while (p < end) {
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const uint8_t *start = p;
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uint8_t op = *p++;
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uint16_t index;
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uint32_t disp;
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if (!(op & 0x80)) {
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/* THREAD record */
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bool frame = !!(op & 0x40);
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printf(" THREAD %-7s%d%s method %c%d (%s)",
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frame ? "frame" : "target", op & 3,
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(op & 0x20) ? " +flag5?" : "",
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(op & 0x40) ? 'F' : 'T',
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op & 3, method_base[op & 3]);
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if ((op & 0x50) != 0x50) {
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printf(" index 0x%04x", get_index(&p));
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}
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putchar('\n');
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} else {
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/* FIXUP subrecord */
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uint8_t fix;
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printf(" FIXUP %s-rel location %2d offset 0x%03x",
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(op & 0x40) ? "seg" : "self",
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(op & 0x3c) >> 2,
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((op & 3) << 8) + *p++);
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fix = *p++;
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printf("\n frame %s%d%s",
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(fix & 0x80) ? "thread " : "F",
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((fix & 0x70) >> 4),
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((fix & 0xc0) == 0xc0) ? "?" : "");
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if ((fix & 0xc0) == 0)
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printf(" datum 0x%04x", get_index(&p));
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printf("\n target %s%d",
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(fix & 0x10) ? "thread " : "method T",
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fix & 3);
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if ((fix & 0x10) == 0)
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printf(" (%s)", method_base[fix & 3]);
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printf(" datum 0x%04x", get_index(&p));
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if ((fix & 0x08) == 0) {
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if (big) {
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printf(" disp 0x%08x", get_32(&p));
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} else {
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printf(" disp 0x%04x", get_16(&p));
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}
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}
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putchar('\n');
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}
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hexdump_data(start-data, start, p-start, n-(start-data));
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}
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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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[0x96] = dump_lnames,
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[0x98] = dump_segdef,
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[0x99] = dump_segdef,
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[0x9c] = dump_fixupp,
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[0x9d] = dump_fixupp,
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[0xca] = dump_lnames,
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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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