jthomp@convex.UUCP (03/20/88)
/* Written 8:55 am Mar 18, 1988 by montnaro@sprite.Sun.COM in convex:comp.emacs */
/* ---------- "Problems building GNU Emacs on Conv" ---------- */
(Stupid 'notes', cut my title... )
Skip Montnaro sez:
I'm trying to build GNU Emacs 18.50 on a Convex C2. At the recommendation of
a person at Convex, I'm using the m-convex.h and s-bsd4-2.h files. It
creates temacs okay, but when it tries to dump xemacs it fails with an
"invalid magic number" error. Can somebody give me a clue as to what I might
be doing wrong? Is there a C2-specific machine-dependent file for Emacs?
Thanks,
Skip Montanaro (montanaro@sprite.steinmetz.ge.com, montanaro@ge-crd.arpa)
(And I sez:)
I don't know who you talked to here, but it wasn't me.
(I'll bet it was someone in the TAC, huh!?)
I don't even know who sent in the m-convex.h file, it wasn't me.
Convex Unix 6.1 (and later) OS does not use the Berkley 'a.out' executable
file format (read header(s)). Rather, we've gone to a 'SOFF'
format. (SOFF is like COFF, but different, the structure members have
different names, essentially.)
You have but two choices:
1) Back out to 6.0 OS. re-make GNUmacs,go back to 6.1
or 6.1.1, since that's what you have.)
I don't recommend this, its hard, and unnecessary.
2) Use m-convex.h and s-bsd4-3.h. Convex 6.1 does all the Bezerkly
kernel stuff. Substitute the included unexec.c for the
one you have, add the two lines:
#define COFF
#define TEXT_START 0x80001000
to the bottom of m-convex.h.
mutter: "rm *.o; make -f xmakefile", wait ~10 minutes,
type "xemacs".
--enjoy
--jim
Jim Thompson Convex Computer Corporation
(214) 952-0536 701 N. Plano Road
"panic: getfs: bad magic" Richardson, Texas 75081
{uiucdcs,ihnp4,sun,allegra,harvard,killer,usenix}!convex!jthomp
just for funzies, I'll announce that gdb 2.5 is finished too.
RMS will be getting all the diffs by this Wed. I swear, or your
money back.
munged unexec.c
(note: This is a hack, but I'll be putting this in
shape for the next distribution, time permitting.)
-------------------- cut here ----------------------
/* Copyright (C) 1985, 1986, 1987 Free Software Foundation, Inc.
NO WARRANTY
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A FAILURE OF THE PROGRAM TO OPERATE WITH ANY OTHER PROGRAMS) THIS
PROGRAM, EVEN IF YOU HAVE BEEN ADVISED OF THE POSSIBILITY OF SUCH
DAMAGES, OR FOR ANY CLAIM BY ANY OTHER PARTY.
GENERAL PUBLIC LICENSE TO COPY
1. You may copy and distribute verbatim copies of this source file
as you receive it, in any medium, provided that you conspicuously and
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2. You may modify your copy or copies of this source file or
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4. You may not copy, sublicense, distribute or transfer this program
except as expressly provided under this License Agreement. Any attempt
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your rights to use the program under this License agreement shall be
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5. If you wish to incorporate parts of this program into other free
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Software Foundation at 1000 Mass Ave, Cambridge, MA 02138. We have not yet
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/* modifyed for C-1 arch by jthomp@convex 871103 */
/*
* 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.
*/
#ifndef emacs
#define PERROR(arg) perror (arg); return -1
#else
#include "config.h"
#define PERROR(file) report_error (file, new)
#endif
#ifndef CANNOT_DUMP /* all rest of file! */
#ifndef CANNOT_UNEXEC /* most of rest of file */
#ifndef mips /* mips machine requires completely separate code. */
#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"
#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 */
#ifdef COFF
#ifndef USG
#ifndef STRIDE
#ifndef UMAX
/* I have a suspicion that these are turned off on all systems
and can be deleted. Try it in version 19. */
#include <machine/filehdr.h>
#include <machine/opthdr.h>
#include <machine/scnhdr.h>
#include <machine/pte.h>
#include <machine/symtab.h>
#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 opthdr 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;
#else /* not COFF */
extern char *sbrk ();
#define SYMS_START ((long) N_SYMOFF (ohdr))
#ifdef HPUX
#ifdef HP9000S200_ID
#define MY_ID HP9000S200_ID
#else
#include <model.h>
#define MY_ID MYSYS
#endif /* no HP9000S200_ID */
static MAGIC OLDMAGIC = {MY_ID, SHARE_MAGIC};
static MAGIC NEWMAGIC = {MY_ID, DEMAND_MAGIC};
#define N_TXTOFF(x) TEXT_OFFSET(x)
#define N_SYMOFF(x) LESYM_OFFSET(x)
static struct exec hdr, ohdr;
#else /* not HPUX */
#if defined (USG) && !defined (IRIS)
static struct bhdr hdr, ohdr;
#define a_magic fmagic
#define a_text tsize
#define a_data dsize
#define a_bss bsize
#define a_syms ssize
#define a_trsize rtsize
#define a_drsize rdsize
#define a_entry entry
#define N_BADMAG(x) \
(((x).fmagic)!=OMAGIC && ((x).fmagic)!=NMAGIC &&\
((x).fmagic)!=FMAGIC && ((x).fmagic)!=IMAGIC)
#define NEWMAGIC FMAGIC
#else /* IRIS or not USG */
static struct exec hdr, ohdr;
#define NEWMAGIC ZMAGIC
#endif /* IRIS or not USG */
#endif /* not HPUX */
static int unexec_text_start;
static int unexec_data_start;
#endif /* not 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 */
#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
static
report_error_1 (fd, msg, a1, a2)
int fd;
char *msg;
int a1, a2;
{
close (fd);
#ifdef emacs
error (msg, a1, a2);
#else
fprintf (stderr, msg, a1, a2);
fprintf (stderr, "\n");
#endif
}
/* ****************************************************************
* 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 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
)
{
close (new);
/* unlink (new_name); /* Failed, unlink new a.out */
return -1;
}
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.
*/
#ifdef COFF
struct scnhdr f_thdr; /* Text section header */
struct scnhdr f_dhdr; /* Data section header */
struct scnhdr f_bhdr; /* Bss section header */
struct scnhdr scntemp; /* Temporary section header */
#endif /* COFF */
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;
{
int tem;
register int scns;
unsigned int bss_end;
pagemask = getpagesize () - 1;
/* Adjust text/data boundary. */
#ifdef NO_REMAP
data_start = (int) start_of_data ();
#else /* not NO_REMAP */
if (!data_start)
data_start = (int) start_of_data ();
#endif /* not 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) & ~pagemask;
/* Adjust data/bss boundary. */
if (bss_start != 0)
{
bss_start = (ADDR_CORRECT (bss_start) + pagemask) & ~pagemask; /* (Up) to page bdry. */
if (bss_start > bss_end)
{
ERROR1 ("unexec: Specified bss_start (%u) is past end of program",
bss_start);
}
}
else
bss_start = bss_end;
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);
}
#ifdef COFF
/* Salvage as much info from the existing file as possible */
if (a_out >= 0)
{
if (read (a_out, &f_hdr, sizeof (f_hdr)) != sizeof (f_hdr))
{
PERROR (a_name);
}
block_copy_start += sizeof (f_hdr);
if (f_hdr.h_opthdr > 0)
{
if (read (a_out, &f_ohdr, sizeof (f_ohdr)) != sizeof (f_ohdr))
{
PERROR (a_name);
}
block_copy_start += sizeof (f_ohdr);
}
/* Loop through section headers, copying them in */
for (scns = f_hdr.h_nscns; scns > 0; scns--) {
if (read (a_out, &scntemp, sizeof (scntemp)) != sizeof (scntemp))
{
PERROR (a_name);
}
if (scntemp.s_scnptr > 0L)
{
if (block_copy_start < scntemp.s_scnptr + scntemp.s_size)
block_copy_start = scntemp.s_scnptr + scntemp.s_size;
}
if (scntemp.s_flags & S_TEXT)
{
f_thdr = scntemp;
}
else if (scntemp.s_flags & S_DATA)
{
f_dhdr = scntemp;
}
else if (scntemp.s_flags & S_BSS)
{
f_bhdr = scntemp;
}
}
}
else
{
ERROR0 ("can't build a COFF file from scratch yet");
}
/* Now we alter the contents of all the f_*hdr variables
to correspond to what we want to dump. */
f_hdr.h_flags |= (0); /* this isn't really correct..*/
#ifdef EXEC_MAGIC
f_ohdr.magic = EXEC_MAGIC;
#endif
f_thdr.s_vaddr = (long) start_of_text ();
f_thdr.s_size = data_start - f_thdr.s_vaddr;
f_thdr.s_scnptr = 4096;
f_thdr.s_relptr = 0;
f_thdr.s_nrel = 0;
f_thdr.s_prot = 0xA;
f_dhdr.s_vaddr = data_start;
f_dhdr.s_size = bss_start - data_start;
f_dhdr.s_scnptr = 4096 + (data_start - f_thdr.s_vaddr);
f_dhdr.s_relptr = 0;
f_dhdr.s_nrel = 0;
f_dhdr.s_prot = 0xC;
f_bhdr.s_vaddr = bss_start;
f_bhdr.s_size = bss_end - bss_start + 4096 /* fudge */;
f_bhdr.s_scnptr = 0;
f_bhdr.s_relptr = 0;
f_bhdr.s_nrel = 0;
f_bhdr.s_prot = 0xC;
#ifdef SECTION_ALIGNMENT
/* Some systems require special alignment
of the sections in the file itself. */
f_thdr.s_scnptr
= (f_thdr.s_scnptr + SECTION_ALIGNMENT) & ~SECTION_ALIGNMENT;
#endif /* SECTION_ALIGNMENT */
text_scnptr = f_thdr.s_scnptr;
data_scnptr = f_dhdr.s_scnptr;
bias = f_dhdr.s_scnptr + f_dhdr.s_size - block_copy_start;
if (f_ohdr.o_symptr > 0L)
{
f_ohdr.o_symptr += bias;
}
if (f_hdr.h_strptr > 0)
{
f_hdr.h_strptr += bias;
}
#ifdef ADJUST_EXEC_HEADER
ADJUST_EXEC_HEADER
#endif /* ADJUST_EXEC_HEADER */
if (write (new, &f_hdr, sizeof (f_hdr)) != sizeof (f_hdr))
{
PERROR (new_name);
}
if (write (new, &f_ohdr, sizeof (f_ohdr)) != sizeof (f_ohdr))
{
PERROR (new_name);
}
if (write (new, &f_thdr, sizeof (f_thdr)) != sizeof (f_thdr))
{
PERROR (new_name);
}
if (write (new, &f_dhdr, sizeof (f_dhdr)) != sizeof (f_dhdr))
{
PERROR (new_name);
}
if (write (new, &f_bhdr, sizeof (f_bhdr)) != sizeof (f_bhdr))
{
PERROR (new_name);
}
return (0);
#else /* if not COFF */
/* Get symbol table info from header of a.out file if given one. */
if (a_out >= 0)
{
if (read (a_out, &ohdr, sizeof hdr) != sizeof hdr)
{
PERROR (a_name);
}
if N_BADMAG (ohdr)
{
ERROR1 ("invalid magic number in %s", a_name);
}
hdr = ohdr;
}
else
{
bzero (hdr, sizeof hdr);
}
unexec_text_start = (long) start_of_text ();
unexec_data_start = data_start;
/* Machine-dependent fixup for header, or maybe for unexec_text_start */
#ifdef ADJUST_EXEC_HEADER
ADJUST_EXEC_HEADER;
#endif /* ADJUST_EXEC_HEADER */
hdr.a_trsize = 0;
hdr.a_drsize = 0;
if (entry_address != 0)
hdr.a_entry = entry_address;
hdr.a_bss = bss_end - bss_start;
hdr.a_data = bss_start - data_start;
#ifdef NO_REMAP
hdr.a_text = ohdr.a_text;
#else /* not NO_REMAP */
hdr.a_text = data_start - unexec_text_start;
#endif /* not NO_REMAP */
#ifdef A_TEXT_OFFSET
hdr.a_text += A_TEXT_OFFSET (ohdr);
#endif
if (write (new, &hdr, sizeof hdr) != sizeof hdr)
{
PERROR (new_name);
}
#ifdef A_TEXT_OFFSET
hdr.a_text -= A_TEXT_OFFSET (ohdr);
#endif
return 0;
#endif /* not COFF */
}
/* ****************************************************************
* copy_text_and_data
*
* Copy the text and data segments from memory to the new a.out
*/
static int
copy_text_and_data (new)
int new;
{
register char *end;
register char *ptr;
#ifdef COFF
lseek (new, (long) text_scnptr, 0);
ptr = (char *) f_thdr.s_vaddr;
end = ptr + f_thdr.s_size;
write_segment (new, ptr, end);
lseek (new, (long) data_scnptr, 0);
ptr = (char *) f_dhdr.s_vaddr;
end = ptr + f_dhdr.s_size;
write_segment (new, ptr, end);
#else /* if not COFF */
/* Some machines count the header as part of the text segment.
That is to say, the header appears in core
just before the address that start_of_text () returns.
For them, N_TXTOFF is the place where the header goes.
We must adjust the seek to the place after the header.
Note that at this point hdr.a_text does *not* count
the extra A_TEXT_OFFSET bytes, only the actual bytes of code. */
#ifdef A_TEXT_SEEK
lseek (new, (long) A_TEXT_SEEK (hdr), 0);
#else
#ifdef A_TEXT_OFFSET
/* Note that on the Sequent machine A_TEXT_OFFSET != sizeof (hdr)
and sizeof (hdr) is the correct amount to add here. */
/* In version 19, eliminate this case and use A_TEXT_SEEK whenever
N_TXTOFF is not right. */
lseek (new, (long) N_TXTOFF (hdr) + sizeof (hdr), 0);
#else
lseek (new, (long) N_TXTOFF (hdr), 0);
#endif /* no A_TEXT_OFFSET */
#endif /* no A_TEXT_SEEK */
ptr = (char *) unexec_text_start;
end = ptr + hdr.a_text;
write_segment (new, ptr, end);
ptr = (char *) unexec_data_start;
end = ptr + hdr.a_data;
/* This lseek is certainly incorrect when A_TEXT_OFFSET
and I believe it is a no-op otherwise.
Let's see if its absence ever fails. */
/* lseek (new, (long) N_TXTOFF (hdr) + hdr.a_text, 0); */
write_segment (new, ptr, end);
#endif /* not COFF */
return 0;
}
write_segment (new, ptr, end)
int new;
register char *ptr, *end;
{
register int i, nwrite, ret;
char buf[80];
extern int errno;
char zeros[128];
bzero (zeros, sizeof zeros);
for (i = 0; ptr < end;)
{
/* distance to next multiple of 128. */
nwrite = (((int) ptr + 128) & -128) - (int) ptr;
/* But not beyond specified end. */
if (nwrite > end - ptr) nwrite = end - ptr;
ret = write (new, ptr, nwrite);
/* If write gets a page fault, it means we reached
a gap between the old text segment and the old data segment.
This gap has probably been remapped into part of the text segment.
So write zeros for it. */
if (ret == -1 && errno == EFAULT)
write (new, zeros, nwrite);
else if (nwrite != ret)
{
sprintf (buf,
"unexec write failure: addr 0x%x, fileno %d, size 0x%x, wrote 0x%x, errno %d",
ptr, new, nwrite, ret, errno);
PERROR (buf);
}
i += nwrite;
ptr += nwrite;
}
}
/* ****************************************************************
* copy_sym
*
* Copy the relocation information and symbol table from the a.out to the new
*/
static int
copy_sym (new, a_out, a_name, new_name)
int new, a_out;
char *a_name, *new_name;
{
char page[1024];
int n;
if (a_out < 0)
return 0;
#ifdef COFF
if (SYMS_START == 0L)
return 0;
#endif /* COFF */
#ifdef COFF
if (lnnoptr) /* if there is line number info */
lseek (a_out, lnnoptr, 0); /* start copying from there */
else
#endif /* COFF */
lseek (a_out, SYMS_START, 0); /* Position a.out to symtab. */
while ((n = read (a_out, page, sizeof page)) > 0)
{
if (write (new, page, n) != n)
{
PERROR (new_name);
}
}
if (n < 0)
{
PERROR (a_name);
}
return 0;
}
/* ****************************************************************
* mark_x
*
* After succesfully building the new a.out, mark it executable
*/
static
mark_x (name)
char *name;
{
struct stat sbuf;
int um;
int new = 0; /* for PERROR */
um = umask (777);
umask (um);
if (stat (name, &sbuf) == -1)
{
PERROR (name);
}
sbuf.st_mode |= 0111 & ~um;
if (chmod (name, sbuf.st_mode) == -1)
PERROR (name);
}
/*
* If the COFF file contains a symbol table and a line number section,
* then any auxiliary entries that have values for x_lnnoptr must
* be adjusted by the amount that the line number section has moved
* in the file (bias computed in make_hdr). The #@$%&* designers of
* the auxiliary entry structures used the absolute file offsets for
* the line number entry rather than an offset from the start of the
* line number section!
*
* When I figure out how to scan through the symbol table and pick out
* the auxiliary entries that need adjustment, this routine will
* be fixed. As it is now, all such entries are wrong and sdb
* will complain. Fred Fish, UniSoft Systems Inc.
*/
#ifdef COFF
/* This function is probably very slow. Instead of reopening the new
file for input and output it should copy from the old to the new
using the two descriptors already open (WRITEDESC and READDESC).
Instead of reading one small structure at a time it should use
a reasonable size buffer. But I don't have time to work on such
things, so I am installing it as submitted to me. -- RMS. */
adjust_lnnoptrs (writedesc, readdesc, new_name)
int writedesc;
int readdesc;
char *new_name;
{
#if 0
register int nsyms;
register int new;
#ifdef amdahl_uts
SYMENT symentry;
AUXENT auxentry;
#else
struct syment symentry;
struct auxent auxentry;
#endif
if (!lnnoptr || !f_hdr.f_symptr)
return 0;
if ((new = open (new_name, 2)) < 0)
{
PERROR (new_name);
return -1;
}
lseek (new, f_hdr.f_symptr, 0);
for (nsyms = 0; nsyms < f_hdr.f_nsyms; nsyms++)
{
read (new, &symentry, SYMESZ);
if (symentry.n_numaux)
{
read (new, &auxentry, AUXESZ);
nsyms++;
if (ISFCN (symentry.n_type)) {
auxentry.x_sym.x_fcnary.x_fcn.x_lnnoptr += bias;
lseek (new, -AUXESZ, 1);
write (new, &auxentry, AUXESZ);
}
}
}
close (new);
#endif 0
}
#endif /* COFF */
#else /* mips */
/* Unexec for mips machines.
Note that I regard it as the responsibility of people at Mips
to tell me about any changes that need to be made in this code.
I won't take responsibility to think about it even if a change
I make elsewhere causes it to break. -- RMS. */
#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>
#define private static
extern int errno;
extern int sys_nerr;
extern char *sys_errlist[];
#define EEOF -1
private void
fatal(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(_error_message, _error_arg);
#define WRITE(_fd, _buffer, _size, _error_message, _error_arg) \
if (write(_fd, _buffer, _size) != _size) \
fatal(_error_message, _error_arg);
#define SEEK(_fd, _position, _error_message, _error_arg) \
errno = EEOF; \
if (lseek(_fd, _position, L_SET) != _position) \
fatal(_error_message, _error_arg);
struct headers {
struct filehdr fhdr;
struct aouthdr aout;
struct scnhdr text_section;
struct scnhdr rdata_section;
struct scnhdr data_section;
struct scnhdr sdata_section;
struct scnhdr sbss_section;
struct scnhdr bss_section;
};
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;
#define BUFSIZE 8192
char buffer[BUFSIZE];
old = open (a_name, O_RDONLY, 0);
if (old < 0) fatal("openning %s", a_name);
new = creat (new_name, 0666);
if (new < 0) fatal("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
if (hdr.fhdr.f_nscns != 6) {
fprintf(stderr, "unexec: %d sections instead of 6.\n", hdr.fhdr.f_nscns);
}
#define CHECK_SCNHDR(field, name, flags) \
if (strcmp(hdr.field.s_name, name) != 0) { \
fprintf(stderr, "unexec: %s section where %s expected.\n", \
hdr.field.s_name, name); \
exit(1); \
} \
else if (hdr.field.s_flags != flags) { \
fprintf(stderr, "unexec: %x flags where %x expected in %s section.\n", \
hdr.field.s_flags, flags, name); \
}
CHECK_SCNHDR(text_section, _TEXT, STYP_TEXT);
CHECK_SCNHDR(rdata_section, _RDATA, STYP_RDATA);
CHECK_SCNHDR(data_section, _DATA, STYP_DATA);
CHECK_SCNHDR(sdata_section, _SDATA, STYP_SDATA);
CHECK_SCNHDR(sbss_section, _SBSS, STYP_SBSS);
CHECK_SCNHDR(bss_section, _BSS, STYP_BSS);
pagesize = getpagesize();
brk = (sbrk(0) + pagesize - 1) & (-pagesize);
hdr.aout.dsize = brk - DATA_START;
hdr.aout.bsize = 0;
if (entry_address == 0) {
extern __start();
hdr.aout.entry = (unsigned)__start;
}
else {
hdr.aout.entry = entry_address;
}
hdr.aout.bss_start = hdr.aout.data_start + hdr.aout.dsize;
hdr.rdata_section.s_size = data_start - DATA_START;
hdr.data_section.s_vaddr = data_start;
hdr.data_section.s_paddr = data_start;
hdr.data_section.s_size = brk - DATA_START;
hdr.data_section.s_scnptr = hdr.rdata_section.s_scnptr
+ hdr.rdata_section.s_size;
hdr.sdata_section.s_vaddr = hdr.data_section.s_vaddr
+ hdr.data_section.s_size;
hdr.sdata_section.s_paddr = hdr.sdata_section.s_paddr;
hdr.sdata_section.s_size = 0;
hdr.sdata_section.s_scnptr = hdr.data_section.s_scnptr
+ hdr.data_section.s_size;
hdr.sbss_section.s_vaddr = hdr.sdata_section.s_vaddr
+ hdr.sdata_section.s_size;
hdr.sbss_section.s_paddr = hdr.sbss_section.s_vaddr;
hdr.sbss_section.s_size = 0;
hdr.sbss_section.s_scnptr = hdr.sdata_section.s_scnptr
+ hdr.sdata_section.s_size;
hdr.bss_section.s_vaddr = hdr.sbss_section.s_vaddr
+ hdr.sbss_section.s_size;
hdr.bss_section.s_paddr = hdr.bss_section.s_vaddr;
hdr.bss_section.s_size = 0;
hdr.bss_section.s_scnptr = hdr.sbss_section.s_scnptr
+ hdr.sbss_section.s_size;
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("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("writing symbols to %s", new_name);
nread = read(old, buffer, BUFSIZE);
if (nread < 0) fatal("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("getting protection on %s", name);
sbuf.st_mode |= 0111 & ~um;
if (chmod(name, sbuf.st_mode) < 0)
fatal("setting protection on %s", name);
}
#endif /* mips */
#else /* CANNOT_UNEXEC */
/* This is used by Apollo sysems running release 9.5
It is similar to the VMS code in vmsmap.c */
extern char * _malloc_base;
extern int my_edata;
/* Structure to write into first block of map file. */
struct map_data
{
char * sdata; /* Start of data area */
char * edata; /* End of data area */
char * smalloc; /* Start of malloc area */
char * emalloc; /* End of malloc area */
};
static int write_data ();
/* Maps in the data and alloc area from the map file. */
int
mapin_data (name)
char * name;
{
int fd;
struct map_data map_data;
char * sbrk ();
_malloc_base = sbrk (0);
/* Open map file. */
if ((fd = open (name, O_RDONLY)) < 0)
{
printf ("Map file not available, running bare Emacs...\n");
return (0); /* Map file not available */
}
/* Read the header data */
if (read (fd, &map_data, sizeof (map_data)) != sizeof (map_data))
{
printf ("Map file not correct format, running bare Emacs...\n");
return (0); /* Map file not available */
}
if (map_data.sdata != start_of_data ())
{
printf ("Start of data area has moved: cannot map in data.\n");
return (0);
}
if (map_data.edata != (char *) &my_edata)
{
printf ("End of data area has moved: cannot map in data.\n");
return (0);
}
/* Extend virtual address space to end of previous malloc area. */
if (brk (map_data.emalloc))
{
printf ("Couldn't set brk.\n");
return (0);
}
/* Open the file for mapping now. */
if (read (fd, map_data.sdata, 1 + map_data.edata - map_data.sdata) < 0)
{
printf ("Couldn't read data section.\n");
exit (1);
}
/* Check mapping. */
if (_malloc_base != map_data.smalloc)
{
printf ("Data area mapping invalid.\n");
exit (1);
}
/* Map malloc area. */
if (read (fd, map_data.smalloc, 1 + map_data.emalloc - map_data.smalloc) < 0)
exit (1);
close (fd);
return (1);
}
/* Writes the data and alloc area to the map file. */
mapout_data (into)
char * into;
{
int fd;
struct map_data map_data;
char * sbrk ();
map_data.sdata = start_of_data ();
map_data.edata = (char *) &my_edata;
map_data.smalloc = _malloc_base;
map_data.emalloc = sbrk (0) - 1;
/* Create map file. */
fd = open (into, O_WRONLY | O_CREAT, 0666);
write (fd, &map_data, sizeof (map_data));
write (fd, map_data.sdata, 1+map_data.edata-map_data.sdata);
write (fd, map_data.smalloc, 1+map_data.emalloc-map_data.smalloc);
close (fd);
return (1);
}
#endif /* CANNOT_UNEXEC */
#endif /* not CANNOT_DUMP */