-/*
- 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 etc/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.
-*/
-
-/* 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.
-
-This file is part of GNU Emacs.
-
-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.
-
-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.
-
-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. */
-
-/* This is based on a public domain program written by IBM. */
-
-/*************** SYSTEM DEFINES *********************************/
-
-#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 */
-{
- 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;
-{
- 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)
- {
- while ((newaddr = (char *)malloc (bufsize - 8)) < original_sbrk)
- ;
- for (numblks = (getpagesize () / bufsize) - 1; numblks > 0; numblks--)
- malloc (bufsize - 8);
- finaladdr = sbrk (0);
- }
- original_sbrk = sbrk (0);
-
- /* If we don't want the dumped data, get an unshared segment. */
- if (!use_dumped_data)
- {
- shmid = shmget (IPC_PRIVATE, PURESIZE, NEW_SHMGET_FLAGS);
- if (shmid == -1
- || shmat (shmid, (char *)PURE_SEG_BITS, 0) == -1)
- {
- fprintf (stderr, "emacs: failure obtaining new unshared memory segment.\n");
- exit (1);
- }
- return;
- }
-
- /* Compute the file name with the dumped data. */
- strcpy (name, PATH_EXEC);
- strcat (name, "/");
- strcat (name, EMACS_DATA_FILE);
-
- /* Open the file and make sure the addresses have not changed. */
- fd = open (name, OLD_OPEN_FLAGS, 0);
- if (fd < 0)
- {
- fprintf (stderr, "emacs: failure opening `%s'\n", name);
- exit (1);
- }
- if (read (fd, (char *)&dh, sizeof (dh)) != sizeof (dh)
- || dh.start != &_data
- || dh.end != &_end
- || dh.sbrk1 != original_sbrk
- || dh.puresize != PURESIZE)
- {
- fprintf (stderr, "emacs: header mismatch in `%s'\n", name);
- exit (1);
- }
-
- /* 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)
- {
- fprintf (stderr, "emacs: failure loading unshared data.\n");
- exit (1);
- }
-
- /* Determine ipc key from environment or default */
- if (ipckey && *ipckey)
- shmkey = atoi (ipckey);
- else
- shmkey = SHMKEY;
-
- /* Attach to "pure data" shared memory segment */
- if ((shmid = shmget (shmkey, 0, 0)) == -1
- || (newaddr = shmat (shmid, (char *)PURE_SEG_BITS, OLD_SHMAT_FLAGS)) == -1)
- {
- /* We were unable to open an existing segment. Make a new one. */
- struct shmid_ds buf;
-
- /* First get rid of the one we tried to get. */
- shmdt ((char *)PURE_SEG_BITS);
- shmctl (shmid, IPC_RMID, 0);
-
- /* If we could not write the data file,
- don't make a shared segment that we could write.
- Make an unshared segment instead. */
- if (access (name, W_OK) == 0)
- {
- shmid = shmget (IPC_PRIVATE, PURESIZE, NEW_SHMGET_FLAGS);
- if (shmid == -1
- || shmat (shmid, (char *)PURE_SEG_BITS, 0) == -1)
- {
- fprintf (stderr, "emacs: failure obtaining new unshared memory segment.\n");
- exit (1);
- }
-
- /* Load the proper data into it. */
- if (read (fd, PURE_SEG_BITS, PURESIZE) != PURESIZE)
- {
- fprintf (stderr, "emacs: failure loading shared memory data.\n");
- shmdt ((char *)PURE_SEG_BITS);
- shmctl (shmid, IPC_RMID, 0);
- exit (1);
- }
-
- close (fd);
- return;
- }
-
- /* Allocate the new shared segment and arrange to write it. */
- if ((shmid = shmget (shmkey, PURESIZE, NEW_SHMGET_FLAGS)) == -1
- || shmat (shmid, (char *)PURE_SEG_BITS, 0) == -1)
- {
- fprintf (stderr, "emacs: failure obtaining new shared memory segment.\n");
- shmdt ((char *)PURE_SEG_BITS);
- shmctl (shmid, IPC_RMID, 0);
- exit (1);
- }
-
- /* Load the proper data into it. */
- if (read (fd, PURE_SEG_BITS, PURESIZE) != PURESIZE)
- {
- fprintf (stderr, "emacs: failure loading shared memory data.\n");
- shmdt ((char *)PURE_SEG_BITS);
- shmctl (shmid, IPC_RMID, 0);
- exit (1);
- }
-
- /* Detach from the segment and bring it back readonly. */
- shmdt ((char *)PURE_SEG_BITS);
-
- shmctl (shmid, IPC_STAT, &buf);
- buf.shm_perm.mode = OLD_SHMGET_FLAGS;
- shmctl (shmid, IPC_SET, &buf);
-
- newaddr = shmat (shmid, (char *)PURE_SEG_BITS, OLD_SHMAT_FLAGS);
- if (newaddr == -1)
- {
- fprintf (stderr, "emacs: failure reattaching shared memory segment.\n");
- shmctl (shmid, IPC_RMID, 0);
- exit (1);
- }
- }
-
- close (fd);
-}
-
-/* Dump the appropriate parts of memory into a file named NEW
- from which the shared segment can be initialized. */
-
-void
-map_out_data (new)
- char *new;
-{
- struct data_header dh; /* saved data header */
- int fd; /* saved data file descriptor */
- int length; /* dumped data length; */
-
-
- /* Create "saved data" file header */
- dh.start = &_data;
- dh.end = &_end;
- dh.sbrk1 = original_sbrk;
- dh.sbrk2 = sbrk (0);
- dh.puresize = PURESIZE;
-
- /* Create new "saved data" dump file */
- unlink (new);
- fd = open (new, NEW_OPEN_FLAGS, 0666);
- if (fd < 0)
- report_file_error ("Opening dump file", Fcons (build_string (new), Qnil));
-
- /* Write saved header and data */
- length = sizeof (dh);
- if (write (fd, (char *)&dh, length) != length)
- report_file_error ("Writing dump file header",
- Fcons (build_string (new), Qnil));
- length = dh.end - dh.start;
- if (write (fd, dh.start, length) != length)
- report_file_error ("Writing low core in dump file",
- Fcons (build_string (new), Qnil));
- length = dh.sbrk2 - dh.sbrk1;
- if (write (fd, dh.sbrk1, length) != length)
- report_file_error ("Writing heap in dump file",
- Fcons (build_string (new), Qnil));
- length = PURESIZE;
- if (write (fd, PURE_SEG_BITS, length) != length)
- report_file_error ("Writing pure data in dump file",
- Fcons (build_string (new), Qnil));
- close (fd);
-}
+/* Dump an executable image.
+ Copyright (C) 1985, 1986, 1987, 1988, 1999, 2002, 2003, 2004,
+ 2005, 2006 Free Software Foundation, Inc.
+
+This file is part of GNU Emacs.
+
+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 2, or (at your option)
+any later version.
+
+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.
+
+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, Inc., 51 Franklin Street, Fifth Floor,
+Boston, MA 02110-1301, 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! */
+
+
+/* Originally based on the COFF unexec.c by Spencer W. Thomas.
+ *
+ * Subsequently hacked on by
+ * Bill Mann <Bill_Man@praxisint.com>
+ * Andrew Vignaux <Andrew.Vignaux@comp.vuw.ac.nz>
+ * Mike Sperber <sperber@informatik.uni-tuebingen.de>
+ *
+ * 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.
+ *
+ * data_start and entry_address are ignored.
+ *
+ * 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
+ * sbrk(2).
+ *
+ */
+
+#ifndef emacs
+#define PERROR(arg) perror (arg); return -1
+#else
+#include <config.h>
+#define PERROR(file) report_error (file, new)
+#endif
+
+#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"
+
+#include <sys/types.h>
+#include <stdio.h>
+#include <sys/stat.h>
+#include <errno.h>
+#include <unistd.h>
+#include <fcntl.h>
+
+extern char *start_of_text (void); /* Start of text */
+extern char *start_of_data (void); /* Start of initialized data */
+
+extern int _data;
+extern int _text;
+
+#include <filehdr.h>
+#include <aouthdr.h>
+#include <scnhdr.h>
+#include <syms.h>
+
+static struct filehdr f_hdr; /* File header */
+static struct aouthdr f_ohdr; /* Optional file header (a.out) */
+static long bias; /* Bias to add for growth */
+static long lnnoptr; /* Pointer to line-number info within file */
+
+static long text_scnptr;
+static long data_scnptr;
+#define ALIGN(val, pwr) (((val) + ((1L<<(pwr))-1)) & ~((1L<<(pwr))-1))
+static long load_scnptr;
+static long orig_load_scnptr;
+static long orig_data_scnptr;
+static int unrelocate_symbols (int, int, char *, char *);
+
+#ifndef MAX_SECTIONS
+#define MAX_SECTIONS 10
+#endif
+
+static int adjust_lnnoptrs (int, int, char *);
+
+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
+#include "lisp.h"
+
+static void
+report_error (char *file, int fd)
+{
+ if (fd)
+ close (fd);
+ report_file_error ("Cannot unexec", Fcons (build_string (file), Qnil));
+}
+#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 void
+report_error_1 (int fd, char *msg, int a1, int a2)
+{
+ close (fd);
+#ifdef emacs
+ error (msg, a1, a2);
+#else
+ fprintf (stderr, msg, a1, a2);
+ fprintf (stderr, "\n");
+#endif
+}
+
+static int make_hdr (int, int, unsigned, unsigned, unsigned, char *, char *);
+static void mark_x (char *);
+static int copy_text_and_data (int);
+static int copy_sym (int, int, char *, char *);
+static void write_segment (int, char *, char *);
+\f
+/* ****************************************************************
+ * unexec
+ *
+ * driving logic.
+ */
+int unexec (char *new_name, char *a_name,
+ unsigned data_start,
+ unsigned bss_start,
+ unsigned entry_address)
+{
+ int new = -1, a_out = -1;
+
+ if (a_name && (a_out = open (a_name, O_RDONLY)) < 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
+ || adjust_lnnoptrs (new, a_out, new_name) < 0
+ || unrelocate_symbols (new, a_out, a_name, new_name) < 0)
+ {
+ close (new);
+ 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.
+ */
+static int
+make_hdr (int new, int a_out,
+ unsigned data_start, unsigned bss_start,
+ unsigned entry_address,
+ char *a_name, char *new_name)
+{
+ 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. */
+ data_start = (long) start_of_data ();
+ 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;
+
+ 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);
+ }
+
+ /* Salvage as much info from the existing file as possible */
+ 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)
+ {
+ if (read (a_out, &f_hdr, sizeof (f_hdr)) != sizeof (f_hdr))
+ {
+ PERROR (a_name);
+ }
+ if (f_hdr.f_opthdr > 0)
+ {
+ if (read (a_out, &f_ohdr, sizeof (f_ohdr)) != sizeof (f_ohdr))
+ {
+ PERROR (a_name);
+ }
+ }
+ 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 = §ion[scns];
+ if (read (a_out, s, sizeof (*s)) != sizeof (*s))
+ {
+ PERROR (a_name);
+ }
+
+#define CHECK_SCNHDR(ptr, name, flags) \
+ if (strcmp(s->s_name, name) == 0) { \
+ if (s->s_flags != flags) { \
+ fprintf(stderr, "unexec: %lx flags where %x expected in %s section.\n", \
+ (unsigned long)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", (int) _TEXT);
+ }
+ if (f_dhdr == 0)
+ {
+ ERROR1 ("unexec: couldn't find \"%s\" section", (int) _DATA);
+ }
+ if (f_bhdr == 0)
+ {
+ ERROR1 ("unexec: couldn't find \"%s\" section", (int) _BSS);
+ }
+ }
+ else
+ {
+ 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. */
+
+ /* Indicate that the reloc information is no longer valid for ld (bind);
+ we only update it enough to fake out the exec-time loader. */
+ 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_dhdr->s_size = f_ohdr.dsize;
+ f_bhdr->s_size = f_ohdr.bsize;
+ f_bhdr->s_paddr = f_ohdr.data_start + f_ohdr.dsize;
+ f_bhdr->s_vaddr = f_ohdr.data_start + f_ohdr.dsize;
+
+ /* fix scnptr's */
+ {
+ ulong ptr = section[0].s_scnptr;
+
+ bias = -1;
+ for (scns = 0; scns < f_hdr.f_nscns; scns++)
+ {
+ struct scnhdr *s = §ion[scns];
+
+ if (s->s_flags & STYP_PAD) /* .pad sections omitted in AIX 4.1 */
+ {
+ /*
+ * the text_start should probably be o_algntext but that doesn't
+ * seem to change
+ */
+ if (f_ohdr.text_start != 0) /* && scns != 0 */
+ {
+ s->s_size = 512 - (ptr % 512);
+ if (s->s_size == 512)
+ s->s_size = 0;
+ }
+ s->s_scnptr = ptr;
+ }
+ else if (s->s_flags & STYP_DATA)
+ s->s_scnptr = ptr;
+ else if (!(s->s_flags & (STYP_TEXT | STYP_BSS)))
+ {
+ if (bias == -1) /* if first section after bss */
+ bias = ptr - s->s_scnptr;
+
+ s->s_scnptr += bias;
+ ptr = s->s_scnptr;
+ }
+
+ ptr = ptr + s->s_size;
+ }
+ }
+
+ /* fix other pointers */
+ for (scns = 0; scns < f_hdr.f_nscns; scns++)
+ {
+ struct scnhdr *s = §ion[scns];
+
+ if (s->s_relptr != 0)
+ {
+ s->s_relptr += bias;
+ }
+ if (s->s_lnnoptr != 0)
+ {
+ if (lnnoptr == 0) lnnoptr = s->s_lnnoptr;
+ s->s_lnnoptr += bias;
+ }
+ }
+
+ if (f_hdr.f_symptr > 0L)
+ {
+ f_hdr.f_symptr += bias;
+ }
+
+ text_scnptr = f_thdr->s_scnptr;
+ data_scnptr = f_dhdr->s_scnptr;
+ load_scnptr = f_lhdr ? f_lhdr->s_scnptr : 0;
+
+ if (write (new, &f_hdr, sizeof (f_hdr)) != sizeof (f_hdr))
+ {
+ PERROR (new_name);
+ }
+
+ if (f_hdr.f_opthdr > 0)
+ {
+ if (write (new, &f_ohdr, sizeof (f_ohdr)) != sizeof (f_ohdr))
+ {
+ PERROR (new_name);
+ }
+ }
+
+ for (scns = 0; scns < f_hdr.f_nscns; scns++) {
+ struct scnhdr *s = §ion[scns];
+ if (write (new, s, sizeof (*s)) != sizeof (*s))
+ {
+ PERROR (new_name);
+ }
+ }
+
+ return (0);
+}
+\f
+/* ****************************************************************
+
+ *
+ * Copy the text and data segments from memory to the new a.out
+ */
+static int
+copy_text_and_data (int new)
+{
+ char *end;
+ char *ptr;
+
+ lseek (new, (long) text_scnptr, SEEK_SET);
+ ptr = start_of_text () + text_scnptr;
+ end = ptr + f_ohdr.tsize;
+ write_segment (new, ptr, end);
+
+ lseek (new, (long) data_scnptr, SEEK_SET);
+ ptr = (char *) f_ohdr.data_start;
+ end = ptr + f_ohdr.dsize;
+ write_segment (new, ptr, end);
+
+ return 0;
+}
+
+#define UnexBlockSz (1<<12) /* read/write block size */
+static void
+write_segment (int new, char *ptr, char *end)
+{
+ int i, nwrite, ret;
+ char buf[80];
+ extern int errno;
+ char zeros[UnexBlockSz];
+
+ for (i = 0; ptr < end;)
+ {
+ /* distance to next block. */
+ nwrite = (((int) ptr + UnexBlockSz) & -UnexBlockSz) - (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)
+ {
+ memset (zeros, 0, nwrite);
+ write (new, zeros, nwrite);
+ }
+ else if (nwrite != ret)
+ {
+ sprintf (buf,
+ "unexec write failure: addr 0x%lx, fileno %d, size 0x%x, wrote 0x%x, errno %d",
+ (unsigned long)ptr, new, nwrite, ret, errno);
+ PERROR (buf);
+ }
+ i += nwrite;
+ ptr += nwrite;
+ }
+}
+\f
+/* ****************************************************************
+ * copy_sym
+ *
+ * Copy the relocation information and symbol table from the a.out to the new
+ */
+static int
+copy_sym (int new, int a_out, char *a_name, char *new_name)
+{
+ char page[UnexBlockSz];
+ int n;
+
+ if (a_out < 0)
+ return 0;
+
+ if (orig_load_scnptr == 0L)
+ return 0;
+
+ if (lnnoptr && lnnoptr < orig_load_scnptr) /* if there is line number info */
+ lseek (a_out, lnnoptr, SEEK_SET); /* start copying from there */
+ else
+ lseek (a_out, orig_load_scnptr, SEEK_SET); /* 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;
+}
+\f
+/* ****************************************************************
+ * mark_x
+ *
+ * After successfully building the new a.out, mark it executable
+ */
+static void
+mark_x (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);
+}
+\f
+static int
+adjust_lnnoptrs (int writedesc, int readdesc, char *new_name)
+{
+ int nsyms;
+ int naux;
+ int new;
+ struct syment symentry;
+ union auxent auxentry;
+
+ if (!lnnoptr || !f_hdr.f_symptr)
+ return 0;
+
+ if ((new = open (new_name, O_RDWR)) < 0)
+ {
+ PERROR (new_name);
+ return -1;
+ }
+
+ lseek (new, f_hdr.f_symptr, SEEK_SET);
+ for (nsyms = 0; nsyms < f_hdr.f_nsyms; nsyms++)
+ {
+ read (new, &symentry, SYMESZ);
+ if (symentry.n_sclass == C_BINCL || symentry.n_sclass == C_EINCL)
+ {
+ symentry.n_value += bias;
+ lseek (new, -SYMESZ, SEEK_CUR);
+ write (new, &symentry, SYMESZ);
+ }
+
+ for (naux = symentry.n_numaux; naux-- != 0; )
+ {
+ read (new, &auxentry, AUXESZ);
+ nsyms++;
+ if (naux != 0 /* skip csect auxentry (last entry) */
+ && (symentry.n_sclass == C_EXT || symentry.n_sclass == C_HIDEXT))
+ {
+ auxentry.x_sym.x_fcnary.x_fcn.x_lnnoptr += bias;
+ lseek (new, -AUXESZ, SEEK_CUR);
+ write (new, &auxentry, AUXESZ);
+ }
+ }
+ }
+ close (new);
+
+ return 0;
+}
+
+static int
+unrelocate_symbols (int new, int a_out, char *a_name, char *new_name)
+{
+ int i;
+ LDHDR ldhdr;
+ LDREL ldrel;
+ ulong t_reloc = (ulong) &_text - f_ohdr.text_start;
+#ifndef ALIGN_DATA_RELOC
+ ulong d_reloc = (ulong) &_data - f_ohdr.data_start;
+#else
+ /* This worked (and was needed) before AIX 4.2.
+ I have no idea why. -- Mike */
+ ulong d_reloc = (ulong) &_data - ALIGN(f_ohdr.data_start, 2);
+#endif
+ int * p;
+
+ if (load_scnptr == 0)
+ return 0;
+
+ lseek (a_out, orig_load_scnptr, SEEK_SET);
+ if (read (a_out, &ldhdr, sizeof (ldhdr)) != sizeof (ldhdr))
+ {
+ PERROR (new_name);
+ }
+
+#define SYMNDX_TEXT 0
+#define SYMNDX_DATA 1
+#define SYMNDX_BSS 2
+
+ for (i = 0; i < ldhdr.l_nreloc; i++)
+ {
+ lseek (a_out,
+ orig_load_scnptr + LDHDRSZ + LDSYMSZ*ldhdr.l_nsyms + LDRELSZ*i,
+ SEEK_SET);
+
+ if (read (a_out, &ldrel, LDRELSZ) != LDRELSZ)
+ {
+ PERROR (a_name);
+ }
+
+ /* move the BSS loader symbols to the DATA segment */
+ if (ldrel.l_symndx == SYMNDX_BSS)
+ {
+ ldrel.l_symndx = SYMNDX_DATA;
+
+ lseek (new,
+ load_scnptr + LDHDRSZ + LDSYMSZ*ldhdr.l_nsyms + LDRELSZ*i,
+ SEEK_SET);
+
+ if (write (new, &ldrel, LDRELSZ) != LDRELSZ)
+ {
+ PERROR (new_name);
+ }
+ }
+
+ if (ldrel.l_rsecnm == f_ohdr.o_sndata)
+ {
+ int orig_int;
+
+ lseek (a_out,
+ orig_data_scnptr + (ldrel.l_vaddr - f_ohdr.data_start),
+ SEEK_SET);
+
+ if (read (a_out, (void *) &orig_int, sizeof (orig_int))
+ != sizeof (orig_int))
+ {
+ PERROR (a_name);
+ }
+
+ p = (int *) (ldrel.l_vaddr + d_reloc);
+
+ switch (ldrel.l_symndx) {
+ case SYMNDX_TEXT:
+ orig_int = * p - t_reloc;
+ break;
+
+ case SYMNDX_DATA:
+ case SYMNDX_BSS:
+ orig_int = * p - d_reloc;
+ break;
+ }
+
+ if (orig_int != * p)
+ {
+ lseek (new,
+ data_scnptr + (ldrel.l_vaddr - f_ohdr.data_start),
+ SEEK_SET);
+ if (write (new, (void *) &orig_int, sizeof (orig_int))
+ != sizeof (orig_int))
+ {
+ PERROR (new_name);
+ }
+ }
+ }
+ }
+ return 0;
+}
+
+/* arch-tag: 0783857a-7c2d-456f-a426-58b722d69fd0
+ (do not change this comment) */
HCoop / bpt / emacs.git / blobdiff