coff.c
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/*
* coff.c: routines to read contents of a coff file into a buffer for
* subsequent download to the ultra64 development system.
*
* Cloned from an OS conversion utility suite
*
* Copyright 1995, Silicon Graphics, Inc.
* All Rights Reserved.
*
* This is UNPUBLISHED PROPRIETARY SOURCE CODE of Silicon Graphics, Inc.;
* the contents of this file may not be disclosed to third parties, copied or
* duplicated in any form, in whole or in part, without the prior written
* permission of Silicon Graphics, Inc.
*
* RESTRICTED RIGHTS LEGEND:
* Use, duplication or disclosure by the Government is subject to restrictions
* as set forth in subdivision (c)(1)(ii) of the Rights in Technical Data
* and Computer Software clause at DFARS 252.227-7013, and/or in similar or
* successor clauses in the FAR, DOD or NASA FAR Supplement. Unpublished -
* rights reserved under the Copyright Laws of the United States.
*
* $Revision: 1.2 $
*/
#include <stdio.h>
#ifdef __sgi__
#include "sex.h"
#include "sym.h"
#include "cmplrs/stsupport.h"
#include "filehdr.h"
#include "ldfcn.h"
#include "scnhdr.h"
#else
#include "sym.h"
#include "ecoff.h"
#include "mips.h"
#endif
// Function prototypes for internal functions
//
static int Extract(unsigned int *buf);
// Global variables
//
unsigned int Address; /* Address being Dumped. */
unsigned int Data0; /* Data being Dumped. */
unsigned int Data1; /* Data being Dumped. */
int Swap = 0; /* Swap Text Words. */
char *OFileName; /* Object File To Dump. */
char *AFileName; /* ASCII File To Dump into. */
char *SName; /* Section to Dump. */
#ifdef __sgi__
LDFILE *LDPtr; /* File's ld Pointer. */
SCNHDR SHeader; /* Section Header. */
FILE *AFile; /* ASCII File. */
#endif
////////////////////////////////////////////////////////////////////////////////
// readCoff()
//
// Read a COFF file into a buffer. Return number of bytes read,
// -1 if error.
//
int readCoff(char *fname, unsigned int *buf) {
int textSize, dataSize, bssSize;
OFileName = fname;
SName = ".text"; /* set section name = .text */
textSize = Extract(buf);
if (textSize < 0)
return(-1);
/*
* Ignore .data & .bss; we would have to decide where to put them if we
* needed to use them, but these short-lived bootstrap modules won't need
* data or bss, so punt.
*/
#ifdef NOTDEF
OFileName = fname;
SName = ".data"; /* set section name = .data */
dataSize = Extract( ((unsigned int *)((int)buf + textSize)) );
if (dataSize != 0)
return(-1);
OFileName = fname;
SName = ".bss"; /* set section name = .text */
bssSize = Extract( ((unsigned int *)((int)buf + (textSize + dataSize))) );
if (bssSize < 0)
return(-1);
return( (textSize + dataSize + bssSize) );
#endif
return( textSize );
}
////////////////////////////////////////////////////////////////////////////////
// Extract()
//
//
//
static int Extract(unsigned int *buf) {
int bytesRead = -1;
#ifndef __sgi__
FILE *fp;
FILHDR hdr;
SCNHDR scn;
int n, i;
unsigned short magic;
if ((fp = fopen(OFileName, "r")) == NULL) {
fprintf(stderr, "Extract(): Cannot open %s.\n", OFileName);
return -1;
}
fread(&hdr, sizeof hdr, 1, fp);
magic = hdr.f_magic[1] | hdr.f_magic[0] << 8;
switch (magic)
{
case MIPS_MAGIC_BIG:
case MIPS_MAGIC_BIG2:
case MIPS_MAGIC_BIG3:
#if 0
Swap = (gethostsex () == LITTLEENDIAN);
#endif
break;
case MIPS_MAGIC_LITTLE:
case MIPS_MAGIC_LITTLE2:
case MIPS_MAGIC_LITTLE3:
#if 0
Swap = (gethostsex () == BIGENDIAN);
#endif
break;
}
/* skip aout header */
fseek(fp, sizeof(AOUTHDR), SEEK_CUR);
n = ntohs(hdr.f_nscns[0] | hdr.f_nscns[1] << 8);
for(i = 0; i < n; i++) {
fread(&scn, sizeof scn, 1, fp);
if (strcmp(scn.s_name, SName) == 0) {
fseek(fp, ntohl(scn.s_scnptr[0] | scn.s_scnptr[1] << 8 | scn.s_scnptr[2] << 16 | scn.s_scnptr[3] << 24), SEEK_SET);
bytesRead = fread(buf, 1, ntohl(scn.s_size[0] | scn.s_size[1] << 8 | scn.s_size[2] << 16 | scn.s_size[3] << 24), fp);
break;
}
}
fclose(fp);
return bytesRead;
#else
if ((LDPtr = (LDFILE *) ldopen (OFileName, NULL)) == NULL)
{ /* Open File. */
fprintf (stderr, "Extract(): Cannot open %s.\n", OFileName);
return (-1);
}
switch (HEADER (LDPtr).f_magic)
{
case MIPSEBMAGIC:
case MIPSEBMAGIC_2:
case MIPSEBMAGIC_3:
Swap = (gethostsex () == LITTLEENDIAN);
break;
case MIPSELMAGIC:
case MIPSELMAGIC_2:
case MIPSELMAGIC_3:
Swap = (gethostsex () == BIGENDIAN);
break;
}
if (ldnshread (LDPtr, SName, &SHeader) == FAILURE)
{
#ifdef NO_HUSH
fprintf (stderr, "Warning: %s has no %s section.\n", OFileName, SName);
#endif
} else {
FSEEK (LDPtr, SHeader.s_scnptr, BEGINNING);
for (Address = SHeader.s_paddr;
(Address - SHeader.s_paddr) < SHeader.s_size; Address += 8) {
FREAD ((char *)&Data0, 1, 4, LDPtr);
if (Swap) Data0 = swap_word (Data0);
FREAD ((char *)&Data1, 1, 4, LDPtr);
if (Swap) Data1 = swap_word (Data1);
if (Swap) {
*buf = Data1;
*(buf+1) = Data0;
} else {
*buf = Data0;
*(buf+1) = Data1;
}
buf += 2;
}
}
ldclose (LDPtr); /* Close File. */
return(SHeader.s_size); /* # of bytes read */
#endif
}