-/* Copyright (C) 1985, 1986, 1987, 1988, 1992, 1993 Free Software Foundation, Inc.
+/* Copyright (C) 1985,86,87,88,92,93,94 Free Software Foundation, Inc.
This file is part of GNU Emacs.
* 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
+a.out file before starting to write the text segment.
* EXEC_MAGIC
#ifndef CANNOT_DUMP /* all rest of file! */
-#ifndef CANNOT_UNEXEC /* most of rest of file */
-
#ifdef COFF_ENCAPSULATE
int need_coff_header = 1;
#include <coff-encap/a.out.encap.h> /* The location might be a poor assumption */
#else
#ifdef MSDOS
-#include <../go32/gotypes.h>
-#include <../go32/ed/coff.h>
+#include <coff.h>
#define filehdr external_filehdr
#define scnhdr external_scnhdr
#define syment external_syment
#define n_type e_type
struct aouthdr
{
- word16 magic; /* type of file */
- word16 vstamp; /* version stamp */
- word32 tsize; /* text size in bytes, padded to FW bdry*/
- word32 dsize; /* initialized data " " */
- word32 bsize; /* uninitialized data " " */
- word32 entry; /* entry pt. */
- word32 text_start; /* base of text used for this file */
- word32 data_start; /* base of data used for this file */
+ unsigned short magic; /* type of file */
+ unsigned short vstamp; /* version stamp */
+ unsigned long tsize; /* text size in bytes, padded to FW bdry*/
+ unsigned long dsize; /* initialized data " " */
+ unsigned long bsize; /* uninitialized data " " */
+ unsigned long entry; /* entry pt. */
+ unsigned long text_start;/* base of text used for this file */
+ unsigned long data_start;/* base of data used for this file */
};
#endif /* not MSDOS */
#endif
-/* Define getpagesize () if the system does not.
- Note that this may depend on symbols defined in 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/stat.h>
#include <errno.h>
+#include <sys/file.h> /* Must be after sys/types.h for USG and BSD4_1*/
+
+#ifdef USG5
+#include <fcntl.h>
+#endif
+
+#ifndef O_RDONLY
+#define O_RDONLY 0
+#endif
+#ifndef O_RDWR
+#define O_RDWR 2
+#endif
+
+
extern char *start_of_text (); /* Start of text */
extern char *start_of_data (); /* Start of initialized data */
#ifdef emacs
+#include "lisp.h"
+
static
report_error (file, fd)
char *file;
{
if (fd)
close (fd);
- error ("Failure operating on %s\n", file);
+ report_file_error ("Cannot unexec", Fcons (build_string (file), Qnil));
}
#endif /* emacs */
{
int new, a_out = -1;
- if (a_name && (a_out = open (a_name, 0)) < 0)
+ if (a_name && (a_out = open (a_name, O_RDONLY)) < 0)
{
PERROR (a_name);
}
block_copy_start += sizeof (f_ohdr);
}
/* Loop through section headers, copying them in */
+ lseek (a_out, sizeof (f_hdr) + f_hdr.f_opthdr, 0);
for (scns = f_hdr.f_nscns; scns > 0; scns--) {
if (read (a_out, &scntemp, sizeof (scntemp)) != sizeof (scntemp))
{
* will not adjust the file pointer for that section correctly.
*/
- lseek (a_out, sizeof (f_hdr) + sizeof (f_ohdr), 0);
+ /* This used to use sizeof (f_ohdr) instead of .f_opthdr.
+ .f_opthdr is said to be right when there is no optional header. */
+ lseek (a_out, sizeof (f_hdr) + f_hdr.f_opthdr, 0);
for (scns = f_hdr.f_nscns; scns > 0; scns--)
{
PERROR (new_name);
}
+#if 0 /* This #ifndef caused a bug on Linux when using QMAGIC. */
+ /* This adjustment was done above only #ifndef NO_REMAP,
+ so only undo it now #ifndef NO_REMAP. */
+ /* #ifndef NO_REMAP */
+#endif
#ifdef A_TEXT_OFFSET
hdr.a_text -= A_TEXT_OFFSET (ohdr);
#endif
/* 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.
+ 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
lseek (new, (long) N_TXTOFF (hdr), 0);
#endif /* no A_TEXT_SEEK */
+#ifdef RISCiX
+
+ /* Acorn's RISC-iX has a wacky way of initialising the position of the heap.
+ * There is a little table in crt0.o that is filled at link time with
+ * the min and current brk positions, among other things. When start
+ * runs, it copies the table to where these parameters live during
+ * execution. This data is in text space, so it cannot be modified here
+ * before saving the executable, so the data is written manually. In
+ * addition, the table does not have a label, and the nearest accessible
+ * label (mcount) is not prefixed with a '_', thus making it inaccessible
+ * from within C programs. To overcome this, emacs's executable is passed
+ * through the command 'nm %s | fgrep mcount' into a pipe, and the
+ * resultant output is then used to find the address of 'mcount'. As far as
+ * is possible to determine, in RISC-iX releases prior to 1.2, the negative
+ * offset of the table from mcount is 0x2c, whereas from 1.2 onwards it is
+ * 0x30. bss_end has been rounded up to page boundary. This solution is
+ * based on suggestions made by Kevin Welton and Steve Hunt of Acorn, and
+ * avoids the need for a custom version of crt0.o for emacs which has its
+ * table in data space.
+ */
+
+ {
+ char command[1024];
+ char errbuf[1024];
+ char address_text[32];
+ int proforma[4];
+ FILE *pfile;
+ char *temp_ptr;
+ char c;
+ int mcount_address, mcount_offset, count;
+ extern char *_execname;
+
+
+ /* The use of _execname is incompatible with RISCiX 1.1 */
+ sprintf (command, "nm %s | fgrep mcount", _execname);
+
+ if ( (pfile = popen(command, "r")) == NULL)
+ {
+ sprintf (errbuf, "Could not open pipe");
+ PERROR (errbuf);
+ }
+
+ count=0;
+ while ( ((c=getc(pfile)) != EOF) && (c != ' ') && (count < 31))
+ address_text[count++]=c;
+ address_text[count]=0;
+
+ if ((count == 0) || pclose(pfile) != NULL)
+ {
+ sprintf (errbuf, "Failed to execute the command '%s'\n", command);
+ PERROR (errbuf);
+ }
+
+ sscanf(address_text, "%x", &mcount_address);
+ ptr = (char *) unexec_text_start;
+ mcount_offset = (char *)mcount_address - ptr;
+
+#ifdef RISCiX_1_1
+#define EDATA_OFFSET 0x2c
+#else
+#define EDATA_OFFSET 0x30
+#endif
+
+ end = ptr + mcount_offset - EDATA_OFFSET;
+
+ write_segment (new, ptr, end);
+
+ proforma[0] = bss_end; /* becomes _edata */
+ proforma[1] = bss_end; /* becomes _end */
+ proforma[2] = bss_end; /* becomes _minbrk */
+ proforma[3] = bss_end; /* becomes _curbrk */
+
+ write (new, proforma, 16);
+
+ temp_ptr = ptr;
+ ptr = end + 16;
+ end = temp_ptr + hdr.a_text;
+
+ write_segment (new, ptr, end);
+ }
+
+#else /* !RISCiX */
ptr = (char *) unexec_text_start;
end = ptr + hdr.a_text;
write_segment (new, ptr, end);
+#endif /* RISCiX */
ptr = (char *) unexec_data_start;
end = ptr + hdr.a_data;
register int i, nwrite, ret;
char buf[80];
extern int errno;
- char zeros[128];
+ /* This is the normal amount to write at once.
+ It is the size of block that NFS uses. */
+ int writesize = 1 << 13;
+ int pagesize = getpagesize ();
+ char zeros[1 << 13];
- bzero (zeros, sizeof zeros);
+ bzero (zeros, sizeof (zeros));
for (i = 0; ptr < end;)
{
- /* distance to next multiple of 128. */
- nwrite = (((int) ptr + 128) & -128) - (int) ptr;
+ /* Distance to next multiple of writesize. */
+ nwrite = (((int) ptr + writesize) & -writesize) - (int) ptr;
/* But not beyond specified end. */
if (nwrite > end - ptr) nwrite = end - ptr;
ret = write (new, ptr, nwrite);
&& errno == EFAULT
#endif
)
- write (new, zeros, nwrite);
+ {
+ /* Write only a page of zeros at once,
+ so that we we don't overshoot the start
+ of the valid memory in the old data segment. */
+ if (nwrite > pagesize)
+ nwrite = pagesize;
+ write (new, zeros, nwrite);
+ }
+#if 0 /* Now that we have can ask `write' to write more than a page,
+ it is legit for write do less than the whole amount specified. */
else if (nwrite != ret)
{
sprintf (buf,
ptr, new, nwrite, ret, errno);
PERROR (buf);
}
+#endif
i += nwrite;
ptr += nwrite;
}
#ifdef MSDOS
if ((new = writedesc) < 0)
#else
- if ((new = open (new_name, 2)) < 0)
+ if ((new = open (new_name, O_RDWR)) < 0)
#endif
{
PERROR (new_name);
#endif /* COFF */
-#endif /* not CANNOT_UNEXEC */
-
#endif /* not CANNOT_DUMP */
HCoop / bpt / emacs.git / blobdiff