Commit 4e3a36cd authored by Jim Blandy's avatar Jim Blandy
Browse files

entered into RCS

parent b350a838
......@@ -52,6 +52,7 @@
#include <termios.h>
#include <termio.h>
#include <sys/hft.h>
#include <sys/uio.h>
#include <sys/tty.h>
/* #include <sys/pty.h> */
#define REMOTE 0x01
......@@ -76,8 +77,8 @@ typedef int (*FUNC)(); /* pointer to a function */
/*************** EXTERNAL / GLOBAL DATA AREA ********************/
int hfqry();
int hfskbd();
static int hfqry();
static int hfskbd();
char *malloc();
extern int errno;
......
/*
This file is not used because it occasionally fails to work. This
happens because the bss address when Emacs is run is not always the
same. If it happens to be different from what it was
when Emacs was dumped, the dumped data won't work.
No one has been able to prevent the address from varying.
The following comments should be in share-lib/MACHINES if this
dumping is ever made to work:
Note that Emacs can store the pure Lisp data in a shared segment on
this machine, but only if you put this command in one of the boot
scripts
emacs -batch -q
so that it is run as root when the machine is booted. This command
creates a read-only shared segment owned by root. Otherwise the
pure data is not shared. The pure data size is around 100K, which
may not be enough to matter for most users of this machine.
/* Modified by Andrew.Vignaux@comp.vuw.ac.nz to get it to work :-) */
/* Copyright (C) 1985, 1986, 1987, 1988 Free Software Foundation, Inc.
This program 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 1, or (at your option)
any later version.
This program 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 this program; if not, write to the Free Software
Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
In other words, you are welcome to use, share and improve this program.
You are forbidden to forbid anyone else to use, share and improve
what you give them. Help stamp out software-hoarding! */
/*
* unexec.c - Convert a running program into an a.out file.
*
* Author: Spencer W. Thomas
* Computer Science Dept.
* University of Utah
* Date: Tue Mar 2 1982
* Modified heavily since then.
*
* Synopsis:
* unexec (new_name, a_name, data_start, bss_start, entry_address)
* char *new_name, *a_name;
* unsigned data_start, bss_start, entry_address;
*
* Takes a snapshot of the program and makes an a.out format file in the
* file named by the string argument new_name.
* If a_name is non-NULL, the symbol table will be taken from the given file.
* On some machines, an existing a_name file is required.
*
* The boundaries within the a.out file may be adjusted with the data_start
* and bss_start arguments. Either or both may be given as 0 for defaults.
*
* Data_start gives the boundary between the text segment and the data
* segment of the program. The text segment can contain shared, read-only
* program code and literal data, while the data segment is always unshared
* and unprotected. Data_start gives the lowest unprotected address.
* The value you specify may be rounded down to a suitable boundary
* as required by the machine you are using.
*
* Specifying zero for data_start means the boundary between text and data
* should not be the same as when the program was loaded.
* If NO_REMAP is defined, the argument data_start is ignored and the
* segment boundaries are never changed.
*
* Bss_start indicates how much of the data segment is to be saved in the
* a.out file and restored when the program is executed. It gives the lowest
* unsaved address, and is rounded up to a page boundary. The default when 0
* is given assumes that the entire data segment is to be stored, including
* the previous data and bss as well as any additional storage allocated with
* break (2).
*
* The new file is set up to start at entry_address.
*
* If you make improvements I'd like to get them too.
* harpo!utah-cs!thomas, thomas@Utah-20
*
*/
/* There are several compilation parameters affecting unexec:
* COFF
Define this if your system uses COFF for executables.
Otherwise we assume you use Berkeley format.
* NO_REMAP
Define this if you do not want to try to save Emacs's pure data areas
as part of the text segment.
Saving them as text is good because it allows users to share more.
However, on machines that locate the text area far from the data area,
the boundary cannot feasibly be moved. Such machines require
NO_REMAP.
Also, remapping can cause trouble with the built-in startup routine
/lib/crt0.o, which defines `environ' as an initialized variable.
Dumping `environ' as pure does not work! So, to use remapping,
you must write a startup routine for your machine in Emacs's crt0.c.
If NO_REMAP is defined, Emacs uses the system's crt0.o.
* SECTION_ALIGNMENT
Some machines that use COFF executables require that each section
start on a certain boundary *in the COFF file*. Such machines should
define SECTION_ALIGNMENT to a mask of the low-order bits that must be
zero on such a boundary. This mask is used to control padding between
segments in the COFF file.
If SECTION_ALIGNMENT is not defined, the segments are written
consecutively with no attempt at alignment. This is right for
unmodified system V.
* SEGMENT_MASK
Some machines require that the beginnings and ends of segments
*in core* be on certain boundaries. For most machines, a page
boundary is sufficient. That is the default. When a larger
boundary is needed, define SEGMENT_MASK to a mask of
the bits that must be zero on such a boundary.
* A_TEXT_OFFSET(HDR)
Some machines count the a.out header as part of the size of the text
segment (a_text); they may actually load the header into core as the
first data in the text segment. Some have additional padding between
the header and the real text of the program that is counted in a_text.
For these machines, define A_TEXT_OFFSET(HDR) to examine the header
structure HDR and return the number of bytes to add to `a_text'
before writing it (above and beyond the number of bytes of actual
program text). HDR's standard fields are already correct, except that
this adjustment to the `a_text' field has not yet been made;
thus, the amount of offset can depend on the data in the file.
* A_TEXT_SEEK(HDR)
If defined, this macro specifies the number of bytes to seek into the
a.out file before starting to write the text segment.a
* EXEC_MAGIC
For machines using COFF, this macro, if defined, is a value stored
into the magic number field of the output file.
* ADJUST_EXEC_HEADER
This macro can be used to generate statements to adjust or
initialize nonstandard fields in the file header
* ADDR_CORRECT(ADDR)
Macro to correct an int which is the bit pattern of a pointer to a byte
into an int which is the number of a byte.
This macro has a default definition which is usually right.
This default definition is a no-op on most machines (where a
pointer looks like an int) but not on all machines.
*/
/* Dumping and loading data areas, for Emacs under AIX.
(It may also work on other kinds of system V.)
Copyright (C) 1990 Free Software Foundation, Inc.
#define XCOFF
#define COFF
#define NO_REMAP
This file is part of GNU Emacs.
#ifndef emacs
#define PERROR(arg) perror (arg); return -1
#else
#include "config.h"
#define PERROR(file) report_error (file, new)
#endif
GNU Emacs 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 1, or (at your option)
any later version.
#ifndef CANNOT_DUMP /* all rest of file! */
GNU Emacs 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.
#ifndef CANNOT_UNEXEC /* most of rest of file */
You should have received a copy of the GNU General Public License
along with GNU Emacs; see the file COPYING. If not, write to
the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA. */
#include <a.out.h>
/* Define getpagesize () if the system does not.
Note that this may depend on symbols defined in a.out.h
*/
#include "getpagesize.h"
/* This is based on a public domain program written by IBM. */
#ifndef makedev /* Try to detect types.h already loaded */
#include <sys/types.h>
#endif
#include <stdio.h>
#include <sys/stat.h>
#include <errno.h>
extern char *start_of_text (); /* Start of text */
extern char *start_of_data (); /* Start of initialized data */
extern int _data;
extern int _edata;
extern int _text;
extern int _etext;
extern int _end;
#ifdef COFF
#ifndef USG
#ifndef STRIDE
#ifndef UMAX
#ifndef sun386
/* I have a suspicion that these are turned off on all systems
and can be deleted. Try it in version 19. */
#include <filehdr.h>
#include <aouthdr.h>
#include <scnhdr.h>
#include <syms.h>
#endif /* not sun386 */
#endif /* not UMAX */
#endif /* Not STRIDE */
#endif /* not USG */
static long block_copy_start; /* Old executable start point */
static struct filehdr f_hdr; /* File header */
static struct aouthdr f_ohdr; /* Optional file header (a.out) */
long bias; /* Bias to add for growth */
long lnnoptr; /* Pointer to line-number info within file */
#define SYMS_START block_copy_start
static long text_scnptr;
static long data_scnptr;
#ifdef XCOFF
static long load_scnptr;
static long orig_load_scnptr;
static long orig_data_scnptr;
#endif
static long data_st;
#ifndef MAX_SECTIONS
#define MAX_SECTIONS 10
#endif
#endif /* COFF */
static int pagemask;
/* Correct an int which is the bit pattern of a pointer to a byte
into an int which is the number of a byte.
This is a no-op on ordinary machines, but not on all. */
#ifndef ADDR_CORRECT /* Let m-*.h files override this definition */
#define ADDR_CORRECT(x) ((char *)(x) - (char*)0)
#endif
#ifdef emacs
static
report_error (file, fd)
char *file;
int fd;
{
if (fd)
close (fd);
error ("Failure operating on %s", file);
}
#endif /* emacs */
/*************** SYSTEM DEFINES *********************************/
#define ERROR0(msg) report_error_1 (new, msg, 0, 0); return -1
#define ERROR1(msg,x) report_error_1 (new, msg, x, 0); return -1
#define ERROR2(msg,x,y) report_error_1 (new, msg, x, y); return -1
#include "config.h"
#include "paths.h"
#include <sys/types.h>
#include <sys/files.h>
#include <fcntl.h>
#include <sys/mode.h>
#include <sys/ipc.h>
#include <sys/shm.h>
#include <malloc.h>
#include <stdio.h> /* MWW */
#include "lisp.h"
/*************** LOCAL DEFINES **********************************/
struct data_header /* saved data header */
static
report_error_1 (fd, msg, a1, a2)
int fd;
char *msg;
int a1, a2;
{
char *start; /* dump _data addr */
char *end; /* dump _end addr */
char *sbrk1; /* dump original sbrk addr */
char *sbrk2; /* dump final sbrk addr */
int puresize; /* size of pure data dumped */
};
#define EMACSSHMKEY "EMACSSHMKEY"
#define EMACS_DATA_FILE "EMACS-DATA"
#define NEW_SHMGET_FLAGS (IPC_CREAT | S_IWUSR | S_IRUSR \
| S_IWGRP | S_IRGRP | S_IWOTH | S_IROTH)
#define OLD_SHMAT_FLAGS SHM_RDONLY
#define OLD_SHMGET_FLAGS (S_IRUSR | S_IRGRP | S_IROTH)
#define OLD_OPEN_FLAGS O_RDONLY
#define NEW_OPEN_FLAGS (O_RDWR | O_CREAT | O_TRUNC)
/*************** EXTERNAL / GLOBAL DATA AREA ********************/
extern char _data; /* start of data addr */
extern char _end; /* end of all data + 1 addr */
static char *original_sbrk; /* sbrk when dump first run */
void
map_in_data (use_dumped_data)
int use_dumped_data;
close (fd);
#ifdef emacs
error (msg, a1, a2);
#else
fprintf (stderr, msg, a1, a2);
fprintf (stderr, "\n");
#endif
}
static int make_hdr ();
static void mark_x ();
static int copy_text_and_data ();
static int copy_sym ();
/* ****************************************************************
* unexec
*
* driving logic.
*/
unexec (new_name, a_name, data_start, bss_start, entry_address)
char *new_name, *a_name;
unsigned data_start, bss_start, entry_address;
{
int bufsize; /* malloc buffer size */
struct data_header dh; /* saved data header */
int fd; /* saved data file descriptor */
char *finaladdr; /* last addr in bucket */
char *ipckey = getenv (EMACSSHMKEY); /* env ipc key string */
int length; /* dumped data lengths */
char *newaddr; /* new malloc buffer addr */
int numblks; /* number of remaining mallocs */
int shmid; /* shared memory id */
key_t shmkey; /* shared memory key */
/* Note that using malloc here may not be safe. */
char name[sizeof (PATH_EXEC) + sizeof (EMACS_DATA_FILE) + 2];
/* Consume remaining malloc space without increasing */
/* the end of data space */
original_sbrk = sbrk (0);
for (bufsize = 16; bufsize < getpagesize (); bufsize *= 2)
int new, a_out = -1;
if (a_name && (a_out = open (a_name, 0)) < 0)
{
PERROR (a_name);
}
if ((new = creat (new_name, 0666)) < 0)
{
PERROR (new_name);
}
if (make_hdr (new,a_out,data_start,bss_start,entry_address,a_name,new_name) < 0
|| copy_text_and_data (new) < 0
|| copy_sym (new, a_out, a_name, new_name) < 0
#ifdef COFF
|| adjust_lnnoptrs (new, a_out, new_name) < 0
#endif
#ifdef XCOFF
|| unrelocate_symbols (new, a_out, a_name, new_name) < 0
#endif
)
{
while ((newaddr = (char *)malloc (bufsize - 8)) < original_sbrk)
;
for (numblks = (getpagesize () / bufsize) - 1; numblks > 0; numblks--)
malloc (bufsize - 8);
finaladdr = sbrk (0);
close (new);
/* unlink (new_name); /* Failed, unlink new a.out */
return -1;
}
original_sbrk = sbrk (0);
/* If we don't want the dumped data, get an unshared segment. */
if (!use_dumped_data)
close (new);
if (a_out >= 0)
close (a_out);
mark_x (new_name);
return 0;
}
/* ****************************************************************
* make_hdr
*
* Make the header in the new a.out from the header in core.
* Modify the text and data sizes.
*/
static int
make_hdr (new, a_out, data_start, bss_start, entry_address, a_name, new_name)
int new, a_out;
unsigned data_start, bss_start, entry_address;
char *a_name;
char *new_name;
{
register int scns;
unsigned int bss_end;
struct scnhdr section[MAX_SECTIONS];
struct scnhdr * f_thdr; /* Text section header */
struct scnhdr * f_dhdr; /* Data section header */
struct scnhdr * f_bhdr; /* Bss section header */
struct scnhdr * f_lhdr; /* Loader section header */
struct scnhdr * f_tchdr; /* Typechk section header */
struct scnhdr * f_dbhdr; /* Debug section header */
struct scnhdr * f_xhdr; /* Except section header */
load_scnptr = orig_load_scnptr = lnnoptr = 0;
pagemask = getpagesize () - 1;
/* Adjust text/data boundary. */
#ifdef NO_REMAP
data_start = (long) start_of_data ();
#endif /* NO_REMAP */
data_start = ADDR_CORRECT (data_start);
#ifdef SEGMENT_MASK
data_start = data_start & ~SEGMENT_MASK; /* (Down) to segment boundary. */
#else
data_start = data_start & ~pagemask; /* (Down) to page boundary. */
#endif
bss_end = ADDR_CORRECT (sbrk (0)) + pagemask;
bss_end &= ~ pagemask;
/* Adjust data/bss boundary. */
if (bss_start != 0)
{
shmid = shmget (IPC_PRIVATE, PURESIZE, NEW_SHMGET_FLAGS);
if (shmid == -1
|| shmat (shmid, (char *)PURE_SEG_BITS, 0) == -1)
bss_start = (ADDR_CORRECT (bss_start) + pagemask);
/* (Up) to page bdry. */
bss_start &= ~ pagemask;
if (bss_start > bss_end)
{
fprintf (stderr, "emacs: failure obtaining new unshared memory segment.\n");
exit (1);
ERROR1 ("unexec: Specified bss_start (%u) is past end of program",
bss_start);
}
return;
}
else
bss_start = bss_end;
/* Compute the file name with the dumped data. */
strcpy (name, PATH_EXEC);
strcat (name, "/");
strcat (name, EMACS_DATA_FILE);
if (data_start > bss_start) /* Can't have negative data size. */
{
ERROR2 ("unexec: data_start (%u) can't be greater than bss_start (%u)",
data_start, bss_start);
}
/* Open the file and make sure the addresses have not changed. */
fd = open (name, OLD_OPEN_FLAGS, 0);
if (fd < 0)
#ifdef COFF
/* Salvage as much info from the existing file as possible */
block_copy_start = 0;
f_thdr = NULL; f_dhdr = NULL; f_bhdr = NULL;
f_lhdr = NULL; f_tchdr = NULL; f_dbhdr = NULL; f_xhdr = NULL;
if (a_out >= 0)
{
fprintf (stderr, "emacs: failure opening `%s'\n", name);
exit (1);
if (read (a_out, &f_hdr, sizeof (f_hdr)) != sizeof (f_hdr))
{
PERROR (a_name);
}
block_copy_start += sizeof (f_hdr);
if (f_hdr.f_opthdr > 0)
{
if (read (a_out, &f_ohdr, sizeof (f_ohdr)) != sizeof (f_ohdr))
{
PERROR (a_name);
}
block_copy_start += sizeof (f_ohdr);
}
if (f_hdr.f_nscns > MAX_SECTIONS)
{
ERROR0 ("unexec: too many section headers -- increase MAX_SECTIONS");
}
/* Loop through section headers */
for (scns = 0; scns < f_hdr.f_nscns; scns++) {
struct scnhdr *s = &section[scns];
if (read (a_out, s, sizeof (*s)) != sizeof (*s))
{
PERROR (a_name);
}
if (s->s_scnptr > 0L)
{
if (block_copy_start < s->s_scnptr + s->s_size)
block_copy_start = s->s_scnptr + s->s_size;
}
#define CHECK_SCNHDR(ptr, name, flags) \
if (strcmp(s->s_name, name) == 0) { \
if (s->s_flags != flags) { \
fprintf(stderr, "unexec: %x flags where %x expected in %s section.\n", \
s->s_flags, flags, name); \
} \
if (ptr) { \
fprintf(stderr, "unexec: duplicate section header for section %s.\n", \
name); \
} \
ptr = s; \
}
CHECK_SCNHDR(f_thdr, _TEXT, STYP_TEXT);
CHECK_SCNHDR(f_dhdr, _DATA, STYP_DATA);
CHECK_SCNHDR(f_bhdr, _BSS, STYP_BSS);
CHECK_SCNHDR(f_lhdr, _LOADER, STYP_LOADER);
CHECK_SCNHDR(f_dbhdr, _DEBUG, STYP_DEBUG);
CHECK_SCNHDR(f_tchdr, _TYPCHK, STYP_TYPCHK);
CHECK_SCNHDR(f_xhdr, _EXCEPT, STYP_EXCEPT);
}
if (f_thdr == 0)
{
ERROR1 ("unexec: couldn't find \"%s\" section", _TEXT);
}
if (f_dhdr == 0)
{
ERROR1 ("unexec: couldn't find \"%s\" section", _DATA);
}
if (f_bhdr == 0)
{
ERROR1 ("unexec: couldn't find \"%s\" section", _BSS);
}
}
if (read (fd, (char *)&dh, sizeof (dh)) != sizeof (dh)
|| dh.start != &_data
|| dh.end != &_end
|| dh.sbrk1 != original_sbrk
|| dh.puresize != PURESIZE)
else
{
fprintf (stderr, "emacs: header mismatch in `%s'\n", name);
exit (1);
ERROR0 ("can't build a COFF file from scratch yet");
}
orig_data_scnptr = f_dhdr->s_scnptr;
orig_load_scnptr = f_lhdr ? f_lhdr->s_scnptr : 0;
/* Now we alter the contents of all the f_*hdr variables
to correspond to what we want to dump. */
f_hdr.f_flags |= (F_RELFLG | F_EXEC); /* Why? */
#ifdef EXEC_MAGIC
f_ohdr.magic = EXEC_MAGIC;
#endif
#ifndef NO_REMAP
f_ohdr.tsize = data_start - f_ohdr.text_start;
f_ohdr.text_start = (long) start_of_text ();
#endif
f_ohdr.dsize = bss_start - ((unsigned) &_data);
f_ohdr.bsize = bss_end - bss_start;
f_dhdr->s_size = f_ohdr.dsize;
f_bhdr->s_size = f_ohdr.bsize;
f_bhdr->s_paddr = f_ohdr.dsize;
f_bhdr->s_vaddr = f_ohdr.dsize;
/* fix scnptr's */
{
long ptr;
for (scns = 0; scns < f_hdr.f_nscns; scns++) {
struct scnhdr *s = &section[scns];
if (scns == 0)
ptr = s->s_scnptr;
if (s->s_scnptr != 0)
{
s->s_scnptr = ptr;
}
/* Load in the unshared contents. */
if (!(length = dh.end - dh.start)
|| read (fd, (char *)&_data, length) != length
|| !(length = dh.sbrk2 - dh.sbrk1)
|| brk (dh.sbrk2) == -1
|| read (fd, dh.sbrk1, length) != length)
if ((s->s_flags & 0xffff) == STYP_PAD)