-/* Copyright (C) 1985, 1986, 1987, 1988, 1992, 1993, 1994, 2001, 2002, 2003,
- 2004, 2005, 2006, 2007, 2008, 2009, 2010 Free Software Foundation, Inc.
+/* Copyright (C) 1985-1988, 1992-1994, 2001-2012 Free Software Foundation, Inc.
This file is part of GNU Emacs.
* 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;
+ * unexec (const char *new_name, const char *old_name);
*
* 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.
- *
- * 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
*
*/
#include <config.h>
+#include "unexec.h"
+
#define PERROR(file) report_error (file, new)
#ifndef CANNOT_DUMP /* all rest of file! */
#ifdef MSDOS
#include <fcntl.h> /* for O_RDONLY, O_RDWR */
#include <crt0.h> /* for _crt0_startup_flags and its bits */
+#include <sys/exceptn.h>
static int save_djgpp_startup_flags;
#define filehdr external_filehdr
#define scnhdr external_scnhdr
#include <sys/file.h>
-#ifndef O_RDONLY
-#define O_RDONLY 0
-#endif
-#ifndef O_RDWR
-#define O_RDWR 2
-#endif
-
-
-extern char *start_of_data (); /* Start of initialized data */
+#include "mem-limits.h"
static long block_copy_start; /* Old executable start point */
static struct filehdr f_hdr; /* File header */
#define ADDR_CORRECT(x) ((char *)(x) - (char*)0)
-#include <setjmp.h>
#include "lisp.h"
-static
-report_error (file, fd)
- char *file;
- int fd;
+static void
+report_error (const char *file, int fd)
{
if (fd)
close (fd);
#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;
+static void
+report_error_1 (int fd, const char *msg, int a1, int a2)
{
close (fd);
error (msg, a1, a2);
}
\f
-static int make_hdr ();
-static int copy_text_and_data ();
-static int copy_sym ();
-static void mark_x ();
+static int make_hdr (int, int, const char *, const char *);
+static int copy_text_and_data (int, int);
+static int copy_sym (int, int, const char *, const char *);
+static void mark_x (const char *);
/* ****************************************************************
* make_hdr
* 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;
+make_hdr (int new, int a_out,
+ const char *a_name, const char *new_name)
{
- int tem;
auto struct scnhdr f_thdr; /* Text section header */
auto struct scnhdr f_dhdr; /* Data section header */
auto struct scnhdr f_bhdr; /* Bss section header */
auto struct scnhdr scntemp; /* Temporary section header */
register int scns;
- unsigned int bss_end;
+ unsigned int bss_start;
+ unsigned int data_start;
pagemask = getpagesize () - 1;
data_start = ADDR_CORRECT (data_start);
data_start = data_start & ~pagemask; /* (Down) to page boundary. */
- bss_end = ADDR_CORRECT (sbrk (0)) + pagemask;
- bss_end &= ~ pagemask;
-
- /* Adjust data/bss boundary. */
- if (bss_start != 0)
- {
- bss_start = (ADDR_CORRECT (bss_start) + pagemask);
- /* (Up) to page bdry. */
- bss_start &= ~ pagemask;
- if (bss_start > bss_end)
- {
- ERROR1 ("unexec: Specified bss_start (%u) is past end of program",
- bss_start);
- }
- }
- else
- bss_start = bss_end;
+ bss_start = ADDR_CORRECT (sbrk (0)) + pagemask;
+ bss_start &= ~ pagemask;
if (data_start > bss_start) /* Can't have negative data size. */
{
f_hdr.f_flags |= (F_RELFLG | F_EXEC);
f_ohdr.dsize = bss_start - f_ohdr.data_start;
- f_ohdr.bsize = bss_end - bss_start;
+ f_ohdr.bsize = 0;
f_thdr.s_size = f_ohdr.tsize;
f_thdr.s_scnptr = sizeof (f_hdr) + sizeof (f_ohdr);
f_thdr.s_scnptr += (f_hdr.f_nscns) * (sizeof (f_thdr));
}
\f
-write_segment (new, ptr, end)
- int new;
- register char *ptr, *end;
+void
+write_segment (int new, const char *ptr, const char *end)
{
register int i, nwrite, ret;
- char buf[80];
/* This is the normal amount to write at once.
It is the size of block that NFS uses. */
int writesize = 1 << 13;
* Copy the text and data segments from memory to the new a.out
*/
static int
-copy_text_and_data (new, a_out)
- int new, a_out;
+copy_text_and_data (int new, int a_out)
{
register char *end;
register char *ptr;
* 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;
+copy_sym (int new, int a_out, const char *a_name, const char *new_name)
{
char page[1024];
int n;
* After successfully building the new a.out, mark it executable
*/
static void
-mark_x (name)
- char *name;
+mark_x (const char *name)
{
struct stat sbuf;
int um;
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;
+int
+adjust_lnnoptrs (int writedesc, int readdesc, const char *new_name)
{
register int nsyms;
register int new;
*
* 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;
+void
+unexec (const char *new_name, const char *a_name)
{
- int new, a_out = -1;
+ int new = -1, a_out = -1;
if (a_name && (a_out = open (a_name, O_RDONLY)) < 0)
{
PERROR (new_name);
}
- if (make_hdr (new, a_out, data_start, bss_start, entry_address, a_name, new_name) < 0
+ if (make_hdr (new, a_out, a_name, new_name) < 0
|| copy_text_and_data (new, a_out) < 0
|| copy_sym (new, a_out, a_name, new_name) < 0
|| adjust_lnnoptrs (new, a_out, new_name) < 0
)
{
close (new);
- /* unlink (new_name); /* Failed, unlink new a.out */
- return -1;
+ return;
}
close (new);
if (a_out >= 0)
close (a_out);
mark_x (new_name);
- return 0;
}
#endif /* not CANNOT_DUMP */
-
-/* arch-tag: 62409b69-e27a-4a7c-9413-0210d6b54e7f
- (do not change this comment) */
HCoop / bpt / emacs.git / blobdiff