Path: utzoo!utgpu!water!watmath!uunet!tut.cis.ohio-state.edu!EW09.NAS.NASA.GOV!raible
From: raible@EW09.NAS.NASA.GOV (Eric L. Raible)
Newsgroups: gnu.emacs
Subject: Getting 18.52 up and running on an IRIS-4d under OS version 3.0
Message-ID: <8810260121.AA05341@ew09.nas.nasa.gov>
Date: 26 Oct 88 01:21:55 GMT
References: <5884@zodiac.UUCP>
Sender: daemon@tut.cis.ohio-state.edu
Reply-To: raible@orville.nas.nasa.gov
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   Date: 25 Oct 88 00:03:58 GMT
   From: daitc!ida.org!potomac!zodiac!confusion!barry@uunet.uu.net  (Barry Lustig)
   Organization: Advanced Decision Systems, Mt. View, CA (415) 960-7300

   It seems that Silicon Graphics made some changes between 3.0 and
   previous versions of the OS.  /usr/lib/crt0.o is now /usr/lib/crt1.o,
   the symbol "start" is now "__start" (actually, back to normal).  But,
   there must be other problems, because when I try and do the unexec I
   get: 

	   unexec: 7 sections instead of 6.
	   unexec: .init section where .rdata expected.

   Is there anyone from Silicon Graphics, or any place else for that
   matter, who has worked on this?

   Barry Lustig
   Advanced Decision Systems


The solution to this involves a change to m-iris4d.h, an addition to
s-iris3-6.h, and a new unexmips.c from Earl Killian
(mips!wright.mips.com!earl).

All of these changes should work in pre-3.0 systems (rms?).

(Sorry that these changes are not in diff format, but I don't have the
originals handy.)

etc/loadst still doesn't work on the 4d's.  Jon Hahn
(hahn@orville.nas.nasa.gov)  has the relevant code.

------------------ Changes for m-iris4d.h -----------------

/* Define STACK_DIRECTION for alloca.c */

#define STACK_DIRECTION -1

/* Define this is you have the files /usr/lib/crt{1,n}.o */

#define HAVE_CRTN

#ifdef HAVE_CRTN
# define START_FILES /usr/lib/crt1.o
# define LIB_STANDARD -lc /usr/lib/crtn.o
#else
# define START_FILES /usr/lib/crt0.o
# define DEFAULT_ENTRY_ADDRESS start
#endif


/* The standard definitions of these macros would work ok,
   but these are faster because the constants are short.  */

------------------ Addition for s-iris3-6.h -----------------

#define sigsetmask(mask)	/* Null expansion */
#define sigblock(x) x  <==== NEW

/* The IRIS defines SIGIO in signal.h, but doesn't implement it. */
#undef SIGIO

------------------ New unexmips.c -----------------

/* Unexec for MIPS (including IRIS4D).
   Note that the GNU project considers support for MIPS operation
   a peripheral activity which should not be allowed to divert effort
   from development of the GNU system.  Changes in this code will be
   installed when users send them in, but aside from that
   we don't plan to think about it, or about whether other Emacs
   maintenance might break it.

   Copyright (C) 1988 Free Software Foundation, Inc.

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#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>

#ifdef IRIS_4D
#include "getpagesize.h"
#endif

extern int errno;
extern int sys_nerr;
extern char *sys_errlist[];
#define EEOF -1

static void
fatal_unexec(s, va_alist)
    va_dcl
{
    va_list ap;
    if (errno == EEOF) {
	fputs("unexec: unexpected end of file, ", stderr);
    }
    else if (errno < sys_nerr) {
	fprintf(stderr, "unexec: %s, ", sys_errlist[errno]);
    }
    else {
	fprintf(stderr, "unexec: error code %d, ", errno);
    }
    va_start(ap);
    _doprnt(s, ap, stderr);
    fputs(".\n", stderr);
    exit(1);
}

#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);

/* Define name of label for entry point for the dumped executable.  */

#ifndef DEFAULT_ENTRY_ADDRESS
#define DEFAULT_ENTRY_ADDRESS __start
#endif

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];
};

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);
  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);
  }
  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 0
  if (hdr.aout.magic != ZMAGIC
      && hdr.aout.magic != NMAGIC
      && hdr.aout.magic != OMAGIC) {
      fprintf(stderr, "unexec: input file a.out magic number is %o, not %o, %o, or %o.\n",
	      hdr.aout.magic, ZMAGIC, NMAGIC, OMAGIC);
      exit(1);
  }
#else
  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);
  }
#endif

#define CHECK_SCNHDR(ptr, name, flags) \
  if (strcmp(hdr.section[i].s_name, name) == 0) { \
    if (hdr.section[i].s_flags != flags) { \
      fprintf(stderr, "unexec: %x flags where %x expected in %s section.\n", \
	      hdr.section[i].s_flags, flags, name); \
    } \
    ptr = hdr.section + i; \
    i += 1; \
  } \
  else { \
    ptr = NULL; \
  }

  i = 0;
  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
  CHECK_SCNHDR(sdata_section, _SDATA, STYP_SDATA);
  CHECK_SCNHDR(sbss_section,  _SBSS,  STYP_SBSS);
  CHECK_SCNHDR(bss_section,   _BSS,   STYP_BSS);
  if (i != hdr.fhdr.f_nscns) {
      fprintf(stderr, "unexec: %d sections found instead of %d.\n",
	      i, hdr.fhdr.f_nscns);
  }

  pagesize = getpagesize();
  brk = (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;
  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, TEXT_START, hdr.aout.tsize,
	"writing text section to %s", new_name);
  WRITE(new, DATA_START, hdr.aout.dsize,
	"writing text 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 succesfully building the new a.out, mark it executable
 */
static
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);
}