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minix/commands/dis386/diso.c
Ben Gras 98ddbffe6e dis386 - a disassembler for ack 
- it can disassemble object files (dis386o) and executables
    (dis386a)
  - only useful for as long as we still have ack
2010-10-04 13:26:53 +00:00

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/*
* dis_o386: disassemble 386 object files.
*
* $Id: diso.c,v 1.1 1997/10/20 12:00:00 cwr Exp cwr $
*
* Written by C W Rose.
*/
/* Version settings */
#define MINIX
#undef OS2
#undef TEST
#ifdef MINIX
#include <sys/types.h>
#include <sys/stat.h>
#include <minix/config.h>
#include <minix/const.h>
#include <a.out.h>
#include <ansi.h>
#include <assert.h>
#include <ctype.h>
#include <fcntl.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <time.h>
#include <unistd.h>
#undef S_ABS /* used in a.out.h */
#include "out.h" /* ACK compiler output header */
#undef EXTERN
#define EXTERN
#include "dis386.h" /* dis386 header */
#endif
#ifdef OS2
#include <sys/stat.h>
#include <sys/types.h>
#include </local/minix/minix/config.h>
#include </local/minix/minix/const.h>
#include </local/minix/a.out.h>
#include </local/minix/ansi.h>
#include <assert.h>
#include <ctype.h>
#include <fcntl.h>
#include <io.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <time.h>
#undef S_ABS /* used in a.out.h */
#include "out.h" /* ACK compiler output header */
#undef EXTERN
#define EXTERN
#include "dis386.h" /* dis386 header */
#endif
/* Standard defines */
#define FALSE 0
#undef TRUE
#define TRUE !FALSE
#define FAILED -1
#define MAYBE 0
#define OK 1
#define SAME 0
/* Local defines */
#define L_BUFF_LEN 1024
#define BUFF_LEN 256
#define S_BUFF_LEN 20
#define L_BUFF_MAX (L_BUFF_LEN-1)
#define BUFF_MAX (BUFF_LEN-1)
#define S_BUFF_MAX (S_BUFF_LEN-1)
#define PSEP '\\'
#define AOUT "a.out" /* useful default file names */
#define CORE "core"
#define OBJF "test.o"
#define STAB "symbol.tab"
#define LINE_LEN 16
#define SYMLEN 8
#define TEXT 0 /* section indices for locsym[] */
#define ROM 1
#define DATA 2
#define BSS 3
#ifndef lint
static char *Version = "@(#) dis_o386.c $Revision: 1.1 $ $Date: 1997/10/20 12:00:00 $";
#endif
/* Global variables */
int opt_C = FALSE; /* core file name */
int opt_E = FALSE; /* executable file name */
int opt_O = FALSE; /* object file name */
int opt_S = FALSE; /* symbol table name */
int opt_a = FALSE; /* dump tables and disassemble segments */
int opt_b = FALSE; /* dump straight binary */
int opt_d = FALSE; /* dump the data segment */
int opt_f = FALSE; /* first address of dump */
int opt_h = FALSE; /* dump the header structure */
int opt_l = FALSE; /* last address of dump */
int opt_m = FALSE; /* dump the rom segment */
int opt_n = FALSE; /* dump the symbol names */
int opt_r = FALSE; /* dump the relocation structures */
int opt_s = FALSE; /* dump the symbol table */
int opt_t = FALSE; /* dump the text segment */
int opt_u = FALSE; /* dump the bss segment */
int opt_x = FALSE; /* debugging flag */
char progname[BUFF_LEN]; /* program name */
int dbglvl = 0; /* debugging level */
/* Forward declarations */
/* _PROTOTYPE(void usage, (void)); */
unsigned long int atoaddr(char *sp); /* Convert ascii hex/dec to ulong */
int dump_hex(FILE *fp, long s, long n); /* Dump bytes in hex and ascii */
int dump_odata(FILE *fp, long s, long n, int sec); /* Dump object file data section */
int dump_ohdr(struct outhead *ph); /* Dump object file header */
int dump_orel(FILE *fp, long s, long n); /* Dump object file relocation section */
int dump_osec(long b, long e, int sec, int flg); /* Dump object file section */
int dump_oshdr(FILE *fp, long s, long n); /* Dump object file section headers */
int dump_ostr(FILE *fp, long s, long n); /* Dump object file string data */
int dump_osym(FILE *fp, long s, long n); /* Dump object file symbol table data */
int find_osym(long val, int sec); /* Find object file symbol index */
int gen_locsym(FILE *fp, int sec); /* Generate local symbols */
int getstruct(FILE *fp, char *bp, char *s); /* Get values from the input file */
int init_objf(FILE *fp); /* Initialise object file tables */
void usage(void); /* Usage message */
/*
* a t o a d d r
*
* Convert ascii hex/dec to unsigned long.
*
* Returns: Conversion result Always
*/
unsigned long int atoaddr(char *sp)
{
char c, *cp, buff[S_BUFF_LEN];
int j;
unsigned long int result = 0;
/* flip to upper */
for (j = 0 ; j < S_BUFF_MAX && *(sp + j) != '\0' ; j++)
buff[j] = toupper(*(sp + j));
buff[j] = '\0';
/* lose leading whitespace */
cp = buff;
while isspace(*cp)
cp++;
/* check for hexadecimal entry */
if (*cp == '0' && *(cp + 1) == 'X') {
cp += 2;
while (isxdigit(*cp)) {
c = *cp++;
j = (c < 'A') ? c - '0' : c - 'A' + 10;
result = (result << 4) + (c < 'A' ? c - '0' : c - 'A' + 10);
}
}
else
result = atol(buff);
return result;
}
/*
* d u m p _ h e x
*
* Dump bytes in hex and ascii.
*
* Returns: OK Success
* FAILED File read failure, invalid arguments
*/
int dump_hex(FILE *fp, long start, long count)
{
char c, buff[S_BUFF_LEN];
int j, k, status, quit, last;
unsigned long int ulj;
if (start < 0)
return(FAILED);
ulj = 0;
quit = FALSE;
status = OK;
while (TRUE) {
/* get 16 bytes of data */
for (j = 0 ; j < 16 ; j++) {
if ((k = fgetc(fp)) == EOF) {
quit = TRUE;
break;
}
else
buff[j] = (char)k;
}
/* set up to dump any remaining data */
if (quit) {
status = FAILED;
if (j == 0)
break;
else
j--;
}
last = j;
/* print the address */
fprintf(stdout, "%06lx ", start + ulj);
ulj += 16;
if (ulj >= count) {
quit = TRUE;
if (last == 16)
last = (count - 1) % 16;
}
/* print a line of hex data */
for (j = 0 ; j < 16 ; j++ ) {
if (j <= last)
fprintf(stdout, " %02x", buff[j] & 0xff);
else
fprintf(stdout, " ");
if (j == 7)
fprintf(stdout, " -");
}
/* print a trailer of ascii data */
fprintf(stdout, " ");
for (j = 0 ; j < 16 ; j++ ) {
if (j <= last)
c = buff[j];
else
c = ' ';
if (c < 32 || c > 127)
c = '.';
fputc(c, stdout);
}
fprintf(stdout, "\n");
if (quit)
break;
}
return(status);
}
/*
* d u m p _ o d a t a
*
* Dump object file data section.
*
* Returns: OK Success
* FAILED File read failure, invalid arguments
*
* The o_hdrbuf and o_sectab structures are read to determine section addresses.
* The o_symtab and o_strtab structures are read to determine symbol names.
*/
int dump_odata(FILE *fp, long start, long count, int sec)
{
char label[S_BUFF_LEN], data[S_BUFF_LEN], buff[BUFF_LEN];
char *hex = "0123456789ABCDEF";
int j, k, newflg, index, last, status, found, quit;
long int lj, addr;
unsigned long int ulj;
struct locname *np;
if (start < 0 || (start + count) > o_sectab[sec].os_flen)
return(FAILED);
ulj = start;
quit = FALSE;
status = OK;
for (addr = start ; addr < (start + count) ; addr += 16) {
/* get a line's worth of data */
for (j = 0 ; j < 16 ; j++) {
if (j == (start + count - addr)) {
quit = TRUE;
break;
}
if ((k = fgetc(fp)) == EOF) {
status = FAILED;
quit = TRUE;
break;
}
data[j] = (char)k;
}
/* adjust for an unexpected EOF */
if (quit && status == FAILED) {
if (j == 0)
break;
else
j--;
}
last = j;
/* write out the address and clear the rest of the buffer */
sprintf(buff, "%06lx", ulj);
for (k = strlen(buff) ; k < BUFF_MAX ; k++)
buff[k] = ' ';
/* build the hex and ascii data representations */
newflg = TRUE;
found = FALSE;
for (j = 0 ; j < last ; j++ ) {
/* find a local symbol, one per address */
for (np = locsym[sec] ; !found && np != (struct locname *)NULL ;
np = np->l_next) {
if (ulj == np->l_value) {
/* write out any outstanding data */
if (j != 0) {
buff[75] = '\0';
fprintf(stdout, "%s\n", buff);
for (k = 8 ; k < 75 ; k++)
buff[k] = ' ';
}
/* write out the symbol name */
for (k = 0 ; k < 8 ; k++)
label[k] = np->l_name[k];
label[k] = '\0';
fprintf(stdout, "%s\n", label);
found = TRUE;
}
}
/* find any global symbols, several per address */
while (!found && (index = find_osym(ulj, sec)) != -1) {
/* for the first symbol, write out any outstanding data */
if (newflg && j != 0) {
buff[75] = '\0';
fprintf(stdout, "%s\n", buff);
for (k = 8 ; k < 75 ; k++)
buff[k] = ' ';
newflg = FALSE;
}
/* write out the symbol name */
lj = o_symtab[index].on_foff - (long)OFF_CHAR(o_hdrbuf);
for (k = 0 ; k < 8 ; k++)
label[k] = *(o_strtab + lj + k);
label[k] = '\0';
fprintf(stdout, "%s\n", label);
}
/* set up for the next pass */
newflg = TRUE;
found = FALSE;
ulj++;
/* hex digits */
buff[8 + (3 * j) + (j < 8 ? 0 : 2)] = hex[(data[j] >> 4) & 0x0f];
buff[9 + (3 * j) + (j < 8 ? 0 : 2)] = hex[data[j] & 0x0f];
/* ascii conversion */
if (data[j] < 32 || data[j] > 127)
buff[59 + j] = '.';
else
buff[59 + j] = data[j];
if (j == 8)
buff[32] = '-';
}
buff[75] = '\0';
/* write out the result */
fprintf(stdout, "%s\n", buff);
if (quit) break;
}
return(status);
}
/*
* d u m p _ o h d r
*
* Dump object file header data.
*
* Returns: OK Always
*/
int dump_ohdr(struct outhead *ph)
{
char buff[BUFF_LEN];
sprintf(buff, "Magic number: 0x%04.4x", ph->oh_magic);
if (ph->oh_magic == O_MAGIC) strcat(buff, " O_MAGIC");
else strcat(buff, " UNKNOWN");
fprintf(stdout, "%s\n", buff);
fprintf(stdout, "Version stamp: 0x%04.4x\n", ph->oh_stamp);
sprintf(buff, "Format flags: 0x%04.4x", ph->oh_flags);
if (ph->oh_flags & HF_LINK) strcat(buff, " HF_LINK");
if (ph->oh_flags & HF_8086) strcat(buff, " HF_8086");
if (ph->oh_flags & ~(HF_LINK | HF_8086)) strcat(buff, " UNKNOWN");
fprintf(stdout, "%s\n", buff);
fprintf(stdout, "Number of sections: 0x%04.4x\n", ph->oh_nsect);
fprintf(stdout, "Number of relocations: 0x%04.4x\n", ph->oh_nrelo);
fprintf(stdout, "Number of symbols: 0x%04.4x\n", ph->oh_nname);
fprintf(stdout, "Sum of section sizes: 0x%08.8x\n", ph->oh_nemit);
fprintf(stdout, "Size of string area: 0x%08.8x\n", ph->oh_nchar);
return(OK);
}
/*
* d u m p _ o r e l
*
* Dump object file relocation data.
*
* Returns: OK Success
* FAILED Invalid arguments
*
* The o_hdrbuf and o_sectab structures are read to determine section addresses.
* The o_symtab and o_strtab structures are read to determine symbol values.
*/
int dump_orel(FILE *fp, long start, long count)
{
char buff[BUFF_LEN], data[S_BUFF_LEN];
int j;
unsigned int uj;
long int lj;
struct outrelo relbuf;
if (start < 0 || (start + count) > o_hdrbuf.oh_nrelo)
return(FAILED);
for (j = 0 ; j < count ; j++) {
(void) getstruct(fp, (char *)&relbuf, SF_RELO);
sprintf(buff, "%04d Type:", j + start);
if (relbuf.or_type & RELO1) strcat(buff, " RELO1");
if (relbuf.or_type & RELO2) strcat(buff, " RELO2");
if (relbuf.or_type & RELO4) strcat(buff, " RELO4");
if (relbuf.or_type & RELPC) strcat(buff, " RELPC");
else strcat(buff, " ");
if (relbuf.or_type & RELBR) strcat(buff, " RELBR");
if (relbuf.or_type & RELWR) strcat(buff, " RELWR");
if (relbuf.or_type & ~(RELO1 | RELO2 | RELO4 | RELPC | RELBR | RELWR))
strcat(buff, "UNKNOWN");
strcat(buff, " Sect:");
uj = relbuf.or_sect & S_TYP;
if (uj >= S_MIN && uj <= S_MAX) {
#if 1
/* use arbitrary names for Minix 386 */
sprintf(data, " %-5s", o_secnam[uj - S_MIN]);
#else
sprintf(data, " 0x%02.2x", uj - S_MIN);
#endif
strcat(buff, data);
}
/* S_UND is the empty S_TYP field */
if ((relbuf.or_sect & S_TYP) == S_UND) strcat(buff, " S_UND");
if ((relbuf.or_sect & S_TYP) == S_ABS) strcat(buff, " S_ABS");
if ((relbuf.or_sect & S_TYP) == S_CRS) strcat(buff, " S_CRS");
if ((relbuf.or_sect & S_EXT) == S_EXT) strcat(buff, " S_EXT");
else strcat(buff, " ");
if (relbuf.or_sect & ~(S_TYP | S_EXT))
strcat(buff, " UNKNOWN");
strcat(buff, " Symb:");
if (relbuf.or_nami < o_hdrbuf.oh_nname) {
lj = o_symtab[relbuf.or_nami].on_foff - (long)OFF_CHAR(o_hdrbuf);
/* check that addressing isn't messed up */
assert(lj >= 0 && lj < o_hdrbuf.oh_nchar);
/* name size is defined by SZ_NAME */
sprintf(data, "%-13s", o_strtab + lj);
}
else
sprintf(data, " 0x%04.4x", relbuf.or_nami);
strcat(buff, data);
strcat(buff, " Addr:");
sprintf(data, " 0x%08.8x", relbuf.or_addr);
strcat(buff, data);
fprintf(stdout, "%s\n", buff);
#if 0
printf("Type Section Symbol Address\n");
printf("0x%02.2x 0x%02.2x 0x%04.4x 0x%08.8x\n",
relbuf.or_type, relbuf.or_sect,
relbuf.or_nami, relbuf.or_addr);
#endif
}
return(OK);
}
/*
* d u m p _ o s e c
*
* Dump object file section.
*
* Returns: OK Success
* FAILED Invalid arguments
*/
int dump_osec(long addrfirst, long addrlast, int sec, int full)
{
long int addrcount;
/* check that all offsets are valid */
addrcount = o_sectab[sec].os_flen;
if (addrfirst > o_sectab[sec].os_flen || addrlast > o_sectab[sec].os_flen) {
fprintf(stderr, "Invalid %s address range 0x%08.8lu to 0x%08.8lu\n",
o_secnam[sec], addrfirst, addrlast);
return(FAILED);
}
else {
if (opt_l)
addrcount = addrlast + 1;
addrcount = addrcount - addrfirst;
(void) fseek(objfp, o_sectab[sec].os_foff, SEEK_SET);
fprintf(stdout, "\n%s%s:\n", full ? "Disassembled " : "", o_secnam[sec]);
if (full)
(void) dump_odata(objfp, addrfirst, addrcount, sec);
else
(void) dump_hex(objfp, addrfirst, addrcount);
return(OK);
}
/* NOTREACHED */
}
/*
* d u m p _ o s h d r
*
* Dump object file section headers.
*
* Returns: OK Always
*
* The o_secnam structure is read to determine section names.
*/
int dump_oshdr(FILE *fp, long start, long count)
{
int j;
struct outsect secbuf;
fprintf(stdout,
"Name Index Core start Core size File start File size Alignment\n");
for (j = 0 ; j < count ; j++) {
(void) getstruct(fp, (char *)&secbuf, SF_SECT);
if (j >= start)
fprintf(stdout, "%-13s %4.4d 0x%08.8x 0x%08.8x 0x%08.8x 0x%08.8x 0x%08.8x\n",
o_secnam[j], j, secbuf.os_base, secbuf.os_size, secbuf.os_foff,
secbuf.os_flen, secbuf.os_lign);
}
return(OK);
}
/*
* d u m p _ o s t r
*
* Dump object file string data.
*
* Returns: OK Success
* FAILED File read failure, invalid arguments
*
* The o_hdrbuf structure is read to determine section addresses.
*/
int dump_ostr(FILE *fp, long start, long count)
{
int j, k;
if (start < 0 || count > o_hdrbuf.oh_nname)
return(FAILED);
/* we cannot precalculate the offset of a name record */
for (j = 0 ; j < count ; j++) {
fprintf(stdout, "%04d ", j + start);
do {
switch (k = fgetc(fp)) {
case EOF:
return(FAILED);
break;
case 0:
fprintf(stdout, "\n");
break;
default:
fprintf(stdout, "%c", k);
break;
}
} while (k);
}
return(OK);
}
/*
* d u m p _ o s y m
*
* Dump object file symbol table data.
*
* Returns: OK Success
* FAILED Invalid arguments
*
* The o_hdrbuf structure is read to determine section addresses.
* The o_strtab and o_secnam structures are read to determine symbol values.
*/
int dump_osym(FILE *fp, long start, long count)
{
char buff[BUFF_LEN], data[S_BUFF_LEN];
int j;
unsigned int uj;
long lj;
struct outname nambuf;
if (start < 0 || (start + count) > o_hdrbuf.oh_nname)
return(FAILED);
for (j = 0 ; j < count ; j++) {
(void) getstruct(fp, (char *)&nambuf, SF_NAME);
sprintf(buff, "%4.4d", j + start);
#if 1
lj = nambuf.on_foff - (long)OFF_CHAR(o_hdrbuf);
/* check that addressing isn't messed up */
assert(lj >= 0 && lj < o_hdrbuf.oh_nchar);
/* name size is defined by SZ_NAME */
sprintf(data, " %-13s", o_strtab + lj);
strcat(buff, data);
#else
sprintf(data, " 0x%08.8x", nambuf.on_foff);
strcat(buff, data);
#endif
strcat(buff, " Type:");
uj = nambuf.on_type & S_TYP;
if (uj >= S_MIN && uj <= S_MAX) {
#if 1
/* use arbitrary names for Minix 386 */
sprintf(data, " %-5s", o_secnam[uj - S_MIN]);
#else
sprintf(data, " 0x%02.2x", uj - S_MIN);
#endif
strcat(buff, data);
}
/* S_UND is the empty S_TYP field */
if ((nambuf.on_type & S_TYP) == S_UND) strcat(buff, " S_UND");
if ((nambuf.on_type & S_TYP) == S_ABS) strcat(buff, " S_ABS");
if ((nambuf.on_type & S_TYP) == S_CRS) strcat(buff, " S_CRS");
if ((nambuf.on_type & S_EXT) == S_EXT) strcat(buff, " S_EXT");
else strcat(buff, " ");
if ((nambuf.on_type & S_ETC) == S_SCT) strcat(buff, " S_SCT");
if ((nambuf.on_type & S_ETC) == S_LIN) strcat(buff, " S_LIN");
if ((nambuf.on_type & S_ETC) == S_FIL) strcat(buff, " S_FIL");
if ((nambuf.on_type & S_ETC) == S_MOD) strcat(buff, " S_MOD");
if ((nambuf.on_type & S_ETC) == S_COM) strcat(buff, " S_COM");
if ((nambuf.on_type & S_ETC) == 0) strcat(buff, " ");
if (nambuf.on_type &
~(S_TYP | S_EXT | S_SCT | S_LIN | S_FIL | S_MOD | S_COM))
strcat(buff, " UNKNOWN");
#if 1
/* Desc is not used, so save space */
strcat(buff, " Desc: 0x00");
#else
strcat(buff, " Desc:");
sprintf(data, " 0x%04.4x", nambuf.on_desc);
strcat(buff, data);
#endif
strcat(buff, " Valu:");
sprintf(data, " 0x%08.8x", nambuf.on_valu);
strcat(buff, data);
fprintf(stdout, "%s\n", buff);
}
#if 0
fprintf(stdout, "Name Type Debug Value\n");
fprintf(stdout, "0x%08.8x 0x%04.4x 0x%04.4x 0x%08.8x\n",
nambuf.on_u.on_off, nambuf.on_type,
nambuf.on_desc, nambuf.on_valu);
#endif
return(OK);
}
/*
* f i n d _ o s y m
*
* Find an object file symbol name in a unsorted list.
*
* Returns: index Found
* -1 Not found
*
* There may be several symbols with the same value:
* return each of them on successive calls.
*
*/
int find_osym(long value, int sec)
{
static int index = 0;
static long oldval = 0;
static int oldsec = 0;
int j;
/* check for a repeated search */
if (value != oldval || sec != oldsec) {
oldval = value;
oldsec = sec;
index = 0;
}
/* never happen */
else if (index == -1)
return(FAILED);
/* do a linear search for a symbol, as the symbol table is unsorted */
for (j = index ; j < o_hdrbuf.oh_nname ; j++) {
if (value == o_symtab[j].on_valu &&
sec == ((o_symtab[j].on_type & S_TYP) - S_MIN))
break;
}
/* set up the index for the next pass */
if (j == o_hdrbuf.oh_nname)
index = 0;
else
index = j + 1;
return(index - 1);
}
/*
* g e n _ l o c s y m
*
* Generate local symbols.
*
* Returns: OK Success
* FAILED Invalid arguments, malloc failure
*
* This works only for .data, .rom and .bss. Text symbols need
* a disassembly of the text section, and intelligent guesses as
* to whether a local address refers to text or data. In fact,
* this routine can be usefully applied only to the .rom area.
*/
int gen_locsym(FILE *fp, int sec)
{
char data[20];
int j, txtflg, hdrflg;
long int addrcount;
struct locname *np, *current;
/* check that all offsets are valid - this routine won't work for text */
if (sec < ROM || sec > BSS) {
fprintf(stderr, "Invalid section %s\n", o_secnam[sec]);
return(FAILED);
}
/* initialise the label string */
strncpy(data, o_secnam[sec], 4);
data[4] = '\0';
/* initialise the in-memory local name table pointers */
current = (struct locname *)(NULL);
/* read the data area and load the symbols */
(void) fseek(fp, o_sectab[sec].os_foff, SEEK_SET);
addrcount = 0;
txtflg = hdrflg = FALSE;
while (addrcount < o_sectab[sec].os_flen) {
j = fgetc(fp);
if (j < 040 || j > 0177) {
txtflg = FALSE;
hdrflg = FALSE;
}
else
txtflg = TRUE;
/* ensure that the start of each apparent string has a related symbol */
if (txtflg && !hdrflg) {
if (find_osym(addrcount, sec) == -1) {
/* if malloc fails, just collapse */
if ((np = (struct locname *)malloc(sizeof(struct locname)))
== (struct locname *)NULL) {
fprintf(stderr, "%s: malloc failed\n", progname);
return(FAILED);
}
/* update the current record */
sprintf(np->l_name, "%s%04x", data, addrcount & 0xffff);
/* nb. must follow l_name update */
if (sec == TEXT) np->l_sclass = S_TEXT & 0xff;
else if (sec == ROM) np->l_sclass = S_DATA & 0xff;
else if (sec == DATA) np->l_sclass = S_DATA & 0xff;
else if (sec == BSS) np->l_sclass = S_BSS & 0xff;
else sec = 0;
np->l_value = addrcount;
np->l_next = (struct locname *)NULL;
/* and add it to the list */
if (current == (struct locname *)NULL)
locsym[sec] = np;
else
current->l_next = np;
current = np;
}
hdrflg = TRUE;
}
addrcount++;
}
return(OK);
}
/*
* g e t s t r u c t
*
* Returns: 0 Always
*
* Get 1, 2 and 4 byte values from the input file.
*
* Note that the bytes must be reordered and the
* read pointer incremented correctly for each value;
* hence the need for a structure format string.
*
* Called with:
* a file destcriptor
* a pointer to the output buffer
* a structure format string
*/
int getstruct(FILE *fp, char *bp, char *s)
{
int j;
long lj;
while (TRUE) {
switch (*s++) {
#if 0
/* not used */
case '0':
bp++;
continue;
#endif
case '1':
*bp++ = (char) getc(fp);
continue;
case '2':
j = getc(fp);
j |= (getc(fp) << 8);
*((short *)bp) = (short) j;
bp += 2;
continue;
case '4':
lj = (long)getc(fp);
lj |= ((long)getc(fp) << 8);
lj |= ((long)getc(fp) << 16);
lj |= ((long)getc(fp) << 24);
*((long *)bp) = lj;
bp += 4;
continue;
default:
break;
}
break;
}
return(0);
}
/*
* i n i t _ o b j f
*
* Initialise object file tables.
*
* Returns: OK Success
* FAILED Otherwise
*/
int init_objf(FILE *fp)
{
char *cp;
int j;
unsigned int uj;
long int lj;
/* load the header into memory for fast access */
(void) getstruct(fp, (char *)&o_hdrbuf, SF_HEAD);
if (BADMAGIC(o_hdrbuf)) {
fprintf(stderr, "%s: bad magic number.\n", progname);
return(FAILED);
}
if (o_hdrbuf.oh_nsect == 0) {
fprintf(stderr, "%s: no sections present.\n", progname);
return(FAILED);
}
/* check that the whole file can be read */
if (fseek(fp, OFF_CHAR(o_hdrbuf) + o_hdrbuf.oh_nchar, SEEK_SET) != 0) {
fprintf(stderr, "%s: cannot seek to end of file.\n", progname);
return(FAILED);
}
/* load the section data into memory for fast access */
uj = o_hdrbuf.oh_nsect * sizeof(struct outsect);
if (fseek(fp, OFF_SECT(o_hdrbuf), SEEK_SET) != 0) {
fprintf(stderr, "%s: cannot seek to section area.\n", progname);
return(FAILED);
}
if (fread(o_sectab, sizeof(char), uj, fp) != uj) {
fprintf(stderr, "%s: cannot read section area.\n", progname);
return(FAILED);
}
/* load the relocation data into memory for fast access */
/* ### Should this be left on disk and only the indices loaded ? */
uj = o_hdrbuf.oh_nrelo * sizeof(struct outrelo);
if (fseek(fp, OFF_RELO(o_hdrbuf), SEEK_SET) != 0) {
fprintf(stderr, "%s: cannot seek to relocation area.\n", progname);
return(FAILED);
}
if ((cp = (char *)malloc(uj)) == (char *)NULL) {
fprintf(stderr, "%s: malloc failed\n", progname);
return(FAILED);
}
if (fread(cp, sizeof(char), uj, fp) != uj) {
fprintf(stderr, "%s: cannot read relocation area.\n", progname);
return(FAILED);
}
/* initialise the in-memory relocation table array pointers */
o_reltab = (struct outrelo *)cp;
/* ### needs to be optional for files without symbol tables */
/* load the symbol table into memory for fast access */
uj = o_hdrbuf.oh_nname * sizeof(struct outname);
if ((cp = (char *)malloc(uj)) == (char *)NULL) {
fprintf(stderr, "%s: malloc failed\n", progname);
return(FAILED);
}
if (fseek(fp, OFF_NAME(o_hdrbuf), SEEK_SET) != 0) {
fprintf(stderr, "%s: cannot seek to symbol area.\n", progname);
return(FAILED);
}
if (fread(cp, sizeof(char), uj, fp) != uj) {
fprintf(stderr, "%s: cannot read symbol area.\n", progname);
return(FAILED);
}
/* initialise the in-memory symbol table array pointers */
o_symtab = (struct outname *)cp;
/* load the string area into memory for fast access */
uj = (unsigned int)o_hdrbuf.oh_nchar;
if ((o_strtab = (char *)malloc(uj)) == (char *)NULL) {
fprintf(stderr, "%s: malloc failed\n", progname);
return(FAILED);
}
if (fseek(fp, OFF_CHAR(o_hdrbuf), SEEK_SET) != 0) {
fprintf(stderr, "%s: cannot seek to string area.\n", progname);
return(FAILED);
}
if (fread(o_strtab, sizeof(char), uj, fp) != uj) {
fprintf(stderr, "%s: cannot read string area.\n", progname);
return(FAILED);
}
/* build the section name table */
for (j = 0 ; j < o_hdrbuf.oh_nname ; j++) {
if ((o_symtab[j].on_type & S_ETC) == S_SCT) {
lj = o_symtab[j].on_foff - (long)OFF_CHAR(o_hdrbuf);
/* check that addressing isn't messed up */
assert(lj >= 0 && lj < o_hdrbuf.oh_nchar);
strncpy(o_secnam[(o_symtab[j].on_type & S_TYP) - S_MIN],
o_strtab + lj, SZ_NAME + 1);
}
}
/* build the local symbol tables */
for (j = 0 ; j < MAXSECT ; j++)
locsym[j] = (struct locname *)NULL;
/* build the local .text symbol table */
/* ### full disassembly ? */
/* build the local .rom symbol table */
if (gen_locsym(fp, ROM) == FAILED)
return(FAILED);
/* there's no point in building the .data and .bss tables */
return(OK);
}
/*
* m a i n
*
* Main routine of dis_o386.
*/
int main(int argc, char *argv[])
{
char *cp, objfile[BUFF_LEN], symbfile[BUFF_LEN];
char table[MAXSECT*(SZ_NAME+2)];
int j, errors;
unsigned long int addrfirst, addrlast, addrcount;
struct stat statbuff;
/* initial set up */
if ((cp = strrchr(argv[0], PSEP)) == (char *)NULL)
cp = argv[0];
else
cp++;
strncpy(progname, cp, BUFF_MAX);
strncpy(objfile, OBJF, BUFF_MAX);
addrfirst = addrlast = addrcount = 0;
/* clear the in-core name tables */
o_strtab = (char *)NULL;
for (j = 0 ; j < MAXSECT ; j++)
o_secnam[j] = table + j * (SZ_NAME + 2); /* nb. leading '_' */
for (j = 0 ; j < sizeof(table) ; j++) table[j] = '\0';
/* check for an MSDOS-style option */
if (argc == 2 && argv[1][0] == '/') {
usage();
exit(0);
}
/* parse arguments */
errors = opterr = 0;
while ((j = getopt(argc, argv, "O:S:abdf:hl:mnrstx:")) != EOF) {
switch (j & 0177) {
#if 0
case 'C': /* core file name */
opt_C = TRUE;
if (optarg != (char *)NULL)
strncpy(binfile, optarg, BUFF_MAX);
else
errors++;
break;
case 'E': /* executable file name */
opt_E = TRUE;
if (optarg != (char *)NULL)
strncpy(binfile, optarg, BUFF_MAX);
else
errors++;
break;
#endif
case 'O': /* object file name */
opt_O = TRUE;
if (optarg != (char *)NULL)
strncpy(objfile, optarg, BUFF_MAX);
else
errors++;
break;
case 'S': /* symbol table name */
opt_S = TRUE;
if (optarg != (char *)NULL)
strncpy(symbfile, optarg, BUFF_MAX);
else
errors++;
break;
case 'a': /* dump tables and disassemble segments */
opt_a = TRUE;
break;
case 'b': /* dump straight binary */
opt_b = TRUE;
break;
case 'd': /* dump the data segment */
opt_d = TRUE;
break;
case 'f': /* first address of dump */
opt_f = TRUE;
if (optarg != (char *)NULL) {
addrfirst = atoaddr(optarg);
}
else
errors++;
break;
case 'h': /* dump the header */
opt_h = TRUE;
break;
case 'l': /* last address of dump */
opt_l = TRUE;
if (optarg != (char *)NULL) {
addrlast = atoaddr(optarg);
}
else
errors++;
break;
case 'm': /* dump the rom segment */
opt_m = TRUE;
break;
case 'n': /* dump the symbol names */
opt_n = TRUE;
break;
case 'r': /* dump the relocation structures */
opt_r = TRUE;
break;
case 's': /* dump the symbol table */
opt_s = TRUE;
break;
case 't': /* dump the text segment */
opt_t = TRUE;
break;
#if 0
case 'u': /* dump the bss segment */
opt_u = TRUE;
break;
#endif
case 'x': /* debugging flag */
opt_x = TRUE;
if (optarg != (char *)NULL)
dbglvl = atoi(optarg);
break;
case '?':
default:
usage();
exit(1);
break;
}
}
/* check the flags */
if (errors > 0) {
usage();
exit(1);
}
if (opt_a && (opt_d || opt_h || opt_m || opt_n ||
opt_r || opt_s || opt_t)) {
usage();
exit(1);
}
if ((opt_f || opt_l) && (addrlast > 0 && addrfirst > addrlast)) {
usage();
exit(1);
}
/* check for a specific input file */
if (optind < argc)
strncpy(objfile, argv[optind], BUFF_MAX);
/* we must have a binary file of some sort */
if ((objfp = fopen(objfile, "rb")) == (FILE *)NULL ||
stat(objfile, &statbuff) == -1) {
perror(objfile);
exit(1);
}
/* initialise the object file data structures */
if (init_objf(objfp) == FAILED) {
perror(objfile);
exit(1);
}
/* show the output file name and date */
fprintf(stdout, "File name: %s\nFile date: %s",
objfile, ctime(&statbuff.st_ctime));
/* show the header and section data - default behaviour */
if (opt_a || opt_h || (!opt_d && !opt_m && !opt_n &&
!opt_r && !opt_s && !opt_t)) {
fprintf(stdout, "\nHeader data:\n");
(void) dump_ohdr(&o_hdrbuf);
fprintf(stdout, "\nSection data:\n");
(void) fseek(objfp, OFF_SECT(hdrbuf), SEEK_SET);
(void) dump_oshdr(objfp, 0, o_hdrbuf.oh_nsect);
}
/* The core start address is zero for every section. What allowances
* should be made for the differences between file and core images?
*/
/* dump or disassemble the rom section */
if (opt_a || opt_m) {
if (opt_b)
(void) dump_osec(addrfirst, addrlast, ROM, FALSE);
else
(void) dump_osec(addrfirst, addrlast, ROM, TRUE);
}
/* dump or disassemble the data section */
if (opt_a || opt_d) {
if (opt_b)
(void) dump_osec(addrfirst, addrlast, DATA, FALSE);
else
(void) dump_osec(addrfirst, addrlast, DATA, TRUE);
}
/* dump or disassemble the text section */
if (opt_a || opt_t) {
/* check that all offsets are valid */
if (addrfirst > o_sectab[TEXT].os_flen || addrlast > o_sectab[TEXT].os_flen) {
fprintf(stderr, "Invalid %s address range 0x%08.8lu to 0x%08.8lu\n",
"text", addrfirst, addrlast);
}
else {
if (opt_b)
(void) dump_osec(addrfirst, addrlast, TEXT, FALSE);
else {
addrcount = (addrlast == 0) ? o_sectab[TEXT].os_flen : addrlast;
addrcount -= addrfirst;
disfp = objfp; /* file to be disassembled */
(void) fseek(disfp, o_sectab[TEXT].os_foff + addrfirst, SEEK_SET);
fprintf(stdout, "\nDisassembled text:\n");
(void) dasm(addrfirst, addrcount);
}
}
}
/* show the relocation data */
if (opt_a || opt_r) {
if (opt_b)
addrcount = o_hdrbuf.oh_nrelo * sizeof(struct outrelo);
else
addrcount = o_hdrbuf.oh_nrelo;
/* check that all offsets are valid */
if (addrfirst >= addrcount || addrlast >= addrcount) {
fprintf(stderr, "Invalid %s address range 0x%08.8lu to 0x%08.8lu\n",
"relocation", addrfirst, addrlast);
}
else {
if (opt_l)
addrcount = addrlast + 1;
addrcount = addrcount - addrfirst;
if (opt_b) {
fprintf(stdout, "\nRelocation data dump:\n");
(void) fseek(objfp, OFF_RELO(o_hdrbuf) + addrfirst, SEEK_SET);
(void) dump_hex(objfp, addrfirst, addrcount);
}
else {
fprintf(stdout, "\nRelocation data:\n");
(void) fseek(objfp, OFF_RELO(o_hdrbuf) + addrfirst *
sizeof(struct outrelo), SEEK_SET);
(void) dump_orel(objfp, addrfirst, addrcount);
}
}
}
/* show the symbol data */
if (opt_a || opt_s) {
if (opt_b)
addrcount = o_hdrbuf.oh_nname * sizeof(struct outname);
else
addrcount = o_hdrbuf.oh_nname;
/* check that all offsets are valid */
if (addrfirst >= addrcount || addrlast >= addrcount) {
fprintf(stderr, "Invalid %s address range 0x%08.8lu to 0x%08.8lu\n",
"symbol", addrfirst, addrlast);
}
else {
if (opt_l)
addrcount = addrlast + 1;
addrcount = addrcount - addrfirst;
if (opt_b) {
fprintf(stdout, "\nSymbol data dump:\n");
(void) fseek(objfp, OFF_NAME(o_hdrbuf) + addrfirst, SEEK_SET);
(void) dump_hex(objfp, addrfirst, addrcount);
}
else {
fprintf(stdout, "\nSymbol data:\n");
(void) fseek(objfp, OFF_NAME(o_hdrbuf) + addrfirst *
sizeof(struct outname), SEEK_SET);
(void) dump_osym(objfp, addrfirst, addrcount);
}
}
}
/* show the string data */
if (opt_a || opt_n) {
if (opt_b)
addrcount = o_hdrbuf.oh_nchar;
else
addrcount = o_hdrbuf.oh_nname; /* assumes one name per symbol */
/* check that all offsets are valid */
if (addrfirst >= addrcount || addrlast >= addrcount) {
fprintf(stderr, "Invalid %s address range 0x%08.8lu to 0x%08.8lu\n",
"symbol", addrfirst, addrlast);
}
else {
if (opt_l)
addrcount = addrlast + 1;
addrcount = addrcount - addrfirst;
if (opt_b) {
fprintf(stdout, "\nName data dump:\n");
(void) fseek(objfp, OFF_CHAR(o_hdrbuf) + addrfirst, SEEK_SET);
(void) dump_hex(objfp, addrfirst, addrcount);
}
else {
fprintf(stdout, "\nName data:\n");
(void) fseek(objfp, o_symtab[addrfirst].on_foff, SEEK_SET);
(void) dump_ostr(objfp, addrfirst, addrcount);
}
}
}
/* wrap up */
fclose(objfp);
exit(0);
}
/*
* u s a g e
*
* Usage message.
*
* Returns: Nothing Always
*/
void usage()
{
fprintf(stderr, "Usage: %s [-a|-dhmnrst] [-b] [-f #] [-l #] [-O objfile]\n",
progname);
}
/*
* EOF
*/
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