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/* Unexec for MIPS (including IRIS4D).
Copyright (C) 1988, 1992, 1993, 1994
Free Software Foundation, Inc.
This file is part of XEmacs.
XEmacs is free software; you can redistribute it and/or modify it
under the terms of the GNU General Public License as published by the
Free Software Foundation; either version 2, or (at your option) any
later version.
XEmacs is distributed in the hope that it will be useful, but WITHOUT
ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
for more details.
You should have received a copy of the GNU General Public License
along with XEmacs; see the file COPYING. If not, write to the Free
Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA. */
/* Synched up with: FSF 19.28. */
#include <config.h>
#include <sys/types.h>
#include <sys/file.h>
#include <sys/stat.h>
#include <stdio.h>
#include <varargs.h>
#include <filehdr.h>
#include <aouthdr.h>
#include <scnhdr.h>
#include <sym.h>
#if defined (IRIS_4D) || defined (sony)
#include "getpagesize.h"
#include <fcntl.h>
#endif
static void fatal_unexec ();
static void mark_x ();
#define READ(_fd, _buffer, _size, _error_message, _error_arg) \
errno = EEOF; \
if (read (_fd, _buffer, _size) != _size) \
fatal_unexec (_error_message, _error_arg);
#define WRITE(_fd, _buffer, _size, _error_message, _error_arg) \
if (write (_fd, _buffer, _size) != _size) \
fatal_unexec (_error_message, _error_arg);
#define SEEK(_fd, _position, _error_message, _error_arg) \
errno = EEOF; \
if (lseek (_fd, _position, L_SET) != _position) \
fatal_unexec (_error_message, _error_arg);
extern int errno;
extern char *strerror ();
#define EEOF -1
static struct scnhdr *text_section;
static struct scnhdr *init_section;
static struct scnhdr *finit_section;
static struct scnhdr *rdata_section;
static struct scnhdr *data_section;
static struct scnhdr *lit8_section;
static struct scnhdr *lit4_section;
static struct scnhdr *sdata_section;
static struct scnhdr *sbss_section;
static struct scnhdr *bss_section;
struct headers {
struct filehdr fhdr;
struct aouthdr aout;
struct scnhdr section[10];
};
/* Define name of label for entry point for the dumped executable. */
#ifndef DEFAULT_ENTRY_ADDRESS
#define DEFAULT_ENTRY_ADDRESS __start
#endif
unexec (new_name, a_name, data_start, bss_start, entry_address)
char *new_name, *a_name;
unsigned data_start, bss_start, entry_address;
{
int new, old;
int pagesize, brk;
int newsyms, symrel;
int nread;
struct headers hdr;
int i;
int vaddr, scnptr;
#define BUFSIZE 8192
char buffer[BUFSIZE];
old = open (a_name, O_RDONLY, 0);
if (old < 0) fatal_unexec ("opening %s", a_name);
new = creat (new_name, 0666);
if (new < 0) fatal_unexec ("creating %s", new_name);
hdr = *((struct headers *)TEXT_START);
#ifdef MIPS2
if (hdr.fhdr.f_magic != MIPSELMAGIC
&& hdr.fhdr.f_magic != MIPSEBMAGIC
&& hdr.fhdr.f_magic != (MIPSELMAGIC | 1)
&& hdr.fhdr.f_magic != (MIPSEBMAGIC | 1))
{
fprintf (stderr,
"unexec: input file magic number is %x, not %x, %x, %x or %x.\n",
hdr.fhdr.f_magic,
MIPSELMAGIC, MIPSEBMAGIC,
MIPSELMAGIC | 1, MIPSEBMAGIC | 1);
exit(1);
}
#else /* not MIPS2 */
if (hdr.fhdr.f_magic != MIPSELMAGIC
&& hdr.fhdr.f_magic != MIPSEBMAGIC)
{
fprintf (stderr, "unexec: input file magic number is %x, not %x or %x.\n",
hdr.fhdr.f_magic, MIPSELMAGIC, MIPSEBMAGIC);
exit (1);
}
#endif /* not MIPS2 */
if (hdr.fhdr.f_opthdr != sizeof (hdr.aout))
{
fprintf (stderr, "unexec: input a.out header is %d bytes, not %d.\n",
hdr.fhdr.f_opthdr, sizeof (hdr.aout));
exit (1);
}
if (hdr.aout.magic != ZMAGIC)
{
fprintf (stderr, "unexec: input file a.out magic number is %o, not %o.\n",
hdr.aout.magic, ZMAGIC);
exit (1);
}
#define CHECK_SCNHDR(ptr, name, flags) \
ptr = NULL; \
for (i = 0; i < hdr.fhdr.f_nscns && !ptr; i++) \
if (strcmp (hdr.section[i].s_name, name) == 0) \
{ \
if (hdr.section[i].s_flags != flags) \
fprintf (stderr, "unexec: %x flags (%x expected) in %s section.\n", \
hdr.section[i].s_flags, flags, name); \
ptr = hdr.section + i; \
}
CHECK_SCNHDR (text_section, _TEXT, STYP_TEXT);
CHECK_SCNHDR (init_section, _INIT, STYP_INIT);
CHECK_SCNHDR (rdata_section, _RDATA, STYP_RDATA);
CHECK_SCNHDR (data_section, _DATA, STYP_DATA);
#ifdef _LIT8
CHECK_SCNHDR (lit8_section, _LIT8, STYP_LIT8);
CHECK_SCNHDR (lit4_section, _LIT4, STYP_LIT4);
#endif /* _LIT8 */
CHECK_SCNHDR (sdata_section, _SDATA, STYP_SDATA);
CHECK_SCNHDR (sbss_section, _SBSS, STYP_SBSS);
CHECK_SCNHDR (bss_section, _BSS, STYP_BSS);
#if 0 /* Apparently this error check goes off on irix 3.3,
but it doesn't indicate a real problem. */
if (i != hdr.fhdr.f_nscns)
fprintf (stderr, "unexec: %d sections found instead of %d.\n",
i, hdr.fhdr.f_nscns);
#endif
text_section->s_scnptr = 0;
pagesize = getpagesize ();
/* Casting to int avoids compiler error on NEWS-OS 5.0.2. */
brk = (((int) (sbrk (0))) + pagesize - 1) & (-pagesize);
hdr.aout.dsize = brk - DATA_START;
hdr.aout.bsize = 0;
if (entry_address == 0)
{
extern DEFAULT_ENTRY_ADDRESS ();
hdr.aout.entry = (unsigned)DEFAULT_ENTRY_ADDRESS;
}
else
hdr.aout.entry = entry_address;
hdr.aout.bss_start = hdr.aout.data_start + hdr.aout.dsize;
rdata_section->s_size = data_start - DATA_START;
/* Adjust start and virtual addresses of rdata_section, too. */
rdata_section->s_vaddr = DATA_START;
rdata_section->s_paddr = DATA_START;
rdata_section->s_scnptr = text_section->s_scnptr + hdr.aout.tsize;
data_section->s_vaddr = data_start;
data_section->s_paddr = data_start;
data_section->s_size = brk - data_start;
data_section->s_scnptr = rdata_section->s_scnptr + rdata_section->s_size;
vaddr = data_section->s_vaddr + data_section->s_size;
scnptr = data_section->s_scnptr + data_section->s_size;
if (lit8_section != NULL)
{
lit8_section->s_vaddr = vaddr;
lit8_section->s_paddr = vaddr;
lit8_section->s_size = 0;
lit8_section->s_scnptr = scnptr;
}
if (lit4_section != NULL)
{
lit4_section->s_vaddr = vaddr;
lit4_section->s_paddr = vaddr;
lit4_section->s_size = 0;
lit4_section->s_scnptr = scnptr;
}
if (sdata_section != NULL)
{
sdata_section->s_vaddr = vaddr;
sdata_section->s_paddr = vaddr;
sdata_section->s_size = 0;
sdata_section->s_scnptr = scnptr;
}
if (sbss_section != NULL)
{
sbss_section->s_vaddr = vaddr;
sbss_section->s_paddr = vaddr;
sbss_section->s_size = 0;
sbss_section->s_scnptr = scnptr;
}
if (bss_section != NULL)
{
bss_section->s_vaddr = vaddr;
bss_section->s_paddr = vaddr;
bss_section->s_size = 0;
bss_section->s_scnptr = scnptr;
}
WRITE (new, (void *) TEXT_START, hdr.aout.tsize,
"writing text section to %s", new_name);
WRITE (new, (void *) DATA_START, hdr.aout.dsize,
"writing data section to %s", new_name);
SEEK (old, hdr.fhdr.f_symptr, "seeking to start of symbols in %s", a_name);
errno = EEOF;
nread = read (old, buffer, BUFSIZE);
if (nread < sizeof (HDRR)) fatal_unexec ("reading symbols from %s", a_name);
#define symhdr ((pHDRR)buffer)
newsyms = hdr.aout.tsize + hdr.aout.dsize;
symrel = newsyms - hdr.fhdr.f_symptr;
hdr.fhdr.f_symptr = newsyms;
symhdr->cbLineOffset += symrel;
symhdr->cbDnOffset += symrel;
symhdr->cbPdOffset += symrel;
symhdr->cbSymOffset += symrel;
symhdr->cbOptOffset += symrel;
symhdr->cbAuxOffset += symrel;
symhdr->cbSsOffset += symrel;
symhdr->cbSsExtOffset += symrel;
symhdr->cbFdOffset += symrel;
symhdr->cbRfdOffset += symrel;
symhdr->cbExtOffset += symrel;
#undef symhdr
do
{
if (write (new, buffer, nread) != nread)
fatal_unexec ("writing symbols to %s", new_name);
nread = read (old, buffer, BUFSIZE);
if (nread < 0) fatal_unexec ("reading symbols from %s", a_name);
#undef BUFSIZE
} while (nread != 0);
SEEK (new, 0, "seeking to start of header in %s", new_name);
WRITE (new, &hdr, sizeof (hdr),
"writing header of %s", new_name);
close (old);
close (new);
mark_x (new_name);
}
/*
* mark_x
*
* After successfully building the new a.out, mark it executable
*/
static void
mark_x (name)
char *name;
{
struct stat sbuf;
int um = umask (777);
umask (um);
if (stat (name, &sbuf) < 0)
fatal_unexec ("getting protection on %s", name);
sbuf.st_mode |= 0111 & ~um;
if (chmod (name, sbuf.st_mode) < 0)
fatal_unexec ("setting protection on %s", name);
}
static void
fatal_unexec (s, va_alist)
va_dcl
{
va_list ap;
if (errno == EEOF)
fputs ("unexec: unexpected end of file, ", stderr);
else
fprintf (stderr, "unexec: %s, ", strerror (errno));
va_start (ap);
_doprnt (s, ap, stderr);
fputs (".\n", stderr);
exit (1);
}
These are the contents of the former NiCE NeXT User Group NeXTSTEP/OpenStep software archive, currently hosted by Netfuture.ch.