--- /dev/null
+/*
+ * Code to do an unexec for HPUX 8.0 on an HP9000/[34]00 for a
+ * dynamically linked temacs.
+
+ Copyright (C) 1992-1993 Free Software Foundation, Inc.
+
+This file is part of XEmacs.
+
+XEmacs 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.
+
+XEmacs 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 XEmacs; see the file COPYING. If not, write to
+the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
+Boston, MA 02111-1307, USA. */
+
+/* Synched up with: Not in FSF. */
+
+/*
+Created 29-Oct-92 by Harlan Sexton for SunOS
+
+Modified Jan 93 by Hamish Macdonald for HPUX
+ */
+
+/********************** Included .h Files **************************/
+
+#include <config.h>
+
+#include <stdarg.h>
+#include <sys/param.h>
+#include <sys/file.h>
+#include <sys/stat.h>
+#include <sys/types.h>
+#include <string.h>
+#include <stdio.h>
+#include <errno.h>
+#include <signal.h>
+#ifdef __hp9000s300
+# include </usr/include/debug.h>
+#endif
+#include <a.out.h>
+#include <unistd.h>
+#include <ctype.h>
+#include <sys/dir.h>
+
+#include "sysdep.h"
+
+/* XEmacs: Richard Cognot <cognot@ensg.u-nancy.fr> says we need these */
+extern void perror(const char*);
+extern int sys_nerr;
+extern char *sys_errlist[];
+extern char *strerror (int);
+
+
+/********************** Macros *************************************/
+
+#define SYS_ERR \
+ ((errno > 0)?((errno < sys_nerr)?(sys_errlist[errno]):\
+ "unknown system error"): "unknown error")
+
+#define MASK_UP(x,p_of_two) \
+ ((((unsigned long) (x)) + ((p_of_two) - 1)) & (~((p_of_two) - 1)))
+
+#define MASK_DOWN(x,p_of_two) (((unsigned long) (x)) & (~((p_of_two) - 1)))
+
+/********************** Function Prototypes/Declarations ***********/
+
+static void unexec_error (const char *fmt, int use_errno, ...);
+static int unexec_open (char *filename, int flag, int mode);
+static long unexec_seek (int fd, long position);
+static void unexec_read (int fd, long position, char *buf, int bytes);
+static void unexec_write (int fd, long position, char *buf, int bytes);
+static void unexec_copy (int new_fd, int old_fd, long old_pos, long new_pos,
+ int bytes);
+static void unexec_pad (int fd, int bytes);
+static void unexec_fstat (int fd, struct stat *statptr);
+static void unexec_fchmod (int fd, int mode);
+int run_time_remap (char *dummy);
+
+/********************** Variables **********************************/
+
+/* for reporting error messages from system calls */
+extern int sys_nerr;
+extern int _DYNAMIC;
+extern char **environ;
+
+static unsigned long sbrk_of_0_at_unexec;
+
+/*******************************************************************/
+
+static void
+unexec_error (const char *fmt, int use_errno, ...)
+{
+ const char *err_msg = SYS_ERR;
+ va_list args;
+
+ fprintf (stderr, "unexec - ");
+ va_start (args, use_errno);
+ vfprintf (stderr, fmt, args);
+ va_end (args);
+
+ if (use_errno)
+ fprintf (stderr, ": %s", err_msg);
+ fprintf (stderr, "\n");
+ exit (1);
+ return;
+}
+
+static int
+unexec_open (char *filename, int flag, int mode)
+{
+ int fd;
+
+ errno = 0;
+
+ fd = open (filename, flag, mode);
+
+ if (fd < 0)
+ {
+ unexec_error ("Failure opening file %s", 1, (void *) filename, 0, 0);
+ return -1;
+ }
+ else
+ return fd;
+}
+
+static long
+unexec_seek (int fd, long position)
+{
+ long seek_value;
+
+ if (fd <= 0)
+ unexec_error ("No file open in which to seek", 0, 0, 0, 0);
+
+ errno = 0;
+
+ if (position < 0)
+ seek_value = (long) lseek (fd, 0, L_INCR);
+ else
+ seek_value = (long) lseek (fd, position, L_SET);
+
+ if (seek_value < 0)
+ unexec_error ("Failed to do a seek to 0x%x in %s", 1,
+ (char *) position, "unexec() output file", 0);
+
+ return seek_value;
+}
+
+static void
+unexec_read (int fd, long position, char *buf, int bytes)
+{
+ int n_read;
+ int remains = bytes;
+ position = unexec_seek (fd, position);
+
+ if (bytes < 0)
+ unexec_error ("Attempted read of %d bytes", 0, (char *) bytes, 0, 0);
+
+ errno = 0;
+
+ while (remains > 0)
+ {
+ n_read = read (fd, buf, remains);
+ if (n_read <= 0)
+ unexec_error ("Read failed for 0x%x bytes at offset 0x%x in %s",
+ 1, (char *) bytes, (char *) position,
+ "unexec() output file");
+ buf += n_read;
+ remains -= n_read;
+ }
+
+ return;
+}
+
+static void
+unexec_write (int fd, long position, char *buf, int bytes)
+{
+ int n_written;
+ int remains = bytes;
+ position = unexec_seek (fd, position);
+
+ if (bytes < 0)
+ unexec_error ("Attempted write of %d bytes in %s",
+ 0, (char *) bytes, "unexec() output file", 0);
+
+ errno = 0;
+
+ while (remains > 0)
+ {
+ n_written = write (fd, buf, remains);
+ if (n_written <= 0)
+ unexec_error ("Write failed for 0x%x bytes at offset 0x%x in %s",
+ 1, (char *) bytes, (char *) position,
+ "unexec() output file");
+ buf += n_written;
+ remains -= n_written;
+ }
+
+ return;
+}
+
+static void
+unexec_copy (int new_fd, int old_fd, long old_pos, long new_pos, int bytes)
+{
+ int remains = bytes;
+ char buf[128];
+
+ while (remains > 0)
+ {
+ int n_to_copy = remains > sizeof(buf) ? sizeof(buf) : remains;
+
+ unexec_read (old_fd, old_pos, buf, n_to_copy);
+ unexec_write (new_fd, new_pos, buf, n_to_copy);
+
+ old_pos += n_to_copy;
+ new_pos += n_to_copy;
+ remains -= n_to_copy;
+ }
+
+ return;
+}
+
+static void
+unexec_pad (int fd, int bytes)
+{
+ if (bytes > 0)
+ {
+ char buf[1024];
+ int remaining = bytes;
+
+ memset (buf, 0, sizeof(buf));
+
+ while (remaining > 0)
+ {
+ int this_write = (remaining > sizeof(buf))?sizeof(buf):remaining;
+ unexec_write (fd, -1, buf, this_write);
+ remaining -= this_write;
+ }
+ }
+}
+
+static void
+unexec_fstat (int fd, struct stat *statptr)
+{
+ errno = 0;
+ if (-1 == fstat (fd, statptr))
+ unexec_error ("fstat() failed for descriptor %d", 1, (char *) fd, 0, 0);
+ return;
+}
+
+static void
+unexec_fchmod (int fd, int mode)
+{
+ errno = 0;
+ if (-1 == fchmod (fd, mode))
+ unexec_error ("fchmod() failed for descriptor %d", 1, (char *) fd, 0, 0);
+ return;
+}
+
+/*
+ * EXPORTED FUNCTIONS
+ */
+
+/* this has to be a global variable to prevent the optimizers from
+ * assuming that it can not be 0.
+*/
+static void *dynamic_addr = (void *) &_DYNAMIC;
+
+int
+unexec (char *new_name, char *old_name,
+ unsigned int emacs_edata, unsigned int dummy1, unsigned int dummy2)
+{
+ /* /dld.sl data */
+ struct dynamic *ld = 0;
+ /* old and new state */
+ int old_fd;
+ int new_fd;
+ struct exec old_hdr;
+ struct exec new_hdr;
+ struct stat old_buf;
+ /* some process specific "constants" */
+ unsigned long n_pagsiz;
+ caddr_t dynamic_beg;
+ caddr_t current_break = (caddr_t) sbrk (0);
+
+ /* dynamically linked image? -- if so, find dld.sl structures */
+ if (dynamic_addr)
+ {
+ ld = (struct dynamic *) dynamic_addr;
+#ifdef DEBUG
+ printf ("dl_text = %#x\n", ld->text);
+ printf ("dl_data = %#x\n", ld->data);
+ printf ("dl_bss = %#x\n", ld->bss);
+ printf ("dl_end = %#x\n", ld->end);
+ printf ("dl_dmodule = %#x\n", ld->dmodule);
+ printf ("dl_dlt = %#x\n", ld->dlt);
+ printf ("dl_plt = %#x\n", ld->plt);
+#endif
+ }
+
+ /* open the old and new files, figuring out how big the old one is
+ so that we can map it in */
+ old_fd = unexec_open (old_name, O_RDONLY, 0);
+ new_fd = unexec_open (new_name, O_RDWR | O_CREAT | O_TRUNC, 0666);
+
+ /* setup the header and the statbuf for old_fd */
+ unexec_read (old_fd, 0, (char *) &old_hdr, sizeof (old_hdr));
+ unexec_fstat (old_fd, &old_buf);
+
+ /* set up some important constants */
+ n_pagsiz = EXEC_PAGESIZE;
+
+ /* setup beginning of data to copy from executable */
+ if (ld)
+ dynamic_beg = ld->dmodule;
+ else
+ dynamic_beg = (caddr_t)EXEC_ALIGN (old_hdr.a_text) + old_hdr.a_data;
+
+ /* set up the new exec */
+ new_hdr = old_hdr;
+ new_hdr.a_text = MASK_DOWN (emacs_edata, n_pagsiz);
+ new_hdr.a_data = MASK_UP (current_break, n_pagsiz)
+ - EXEC_ALIGN(new_hdr.a_text);
+ new_hdr.a_bss = 0;
+
+#ifdef DEBUG
+ printf ("old text %#x\n", old_hdr.a_text);
+ printf ("new text %#x\n", new_hdr.a_text);
+ printf ("old data %#x\n", old_hdr.a_data);
+ printf ("new data %#x\n", new_hdr.a_data);
+ printf ("old bss %#x\n", old_hdr.a_bss);
+ printf ("new bss %#x\n", new_hdr.a_bss);
+#endif
+
+ /* set up this variable, in case we want to reset "the break"
+ when restarting */
+ sbrk_of_0_at_unexec = ((unsigned long) MASK_UP (current_break, n_pagsiz));
+
+ /* Write out the first approximation to the new file. The sizes of
+ each section will be correct, but there will be a number of
+ corrections that will need to be made. */
+ {
+ long old_datoff = DATA_OFFSET (old_hdr);
+ long new_datoff = DATA_OFFSET (new_hdr);
+ long old_dataddr = EXEC_ALIGN (old_hdr.a_text);
+ long new_dataddr = EXEC_ALIGN (new_hdr.a_text);
+ long new_mcaloff = MODCAL_OFFSET (new_hdr);
+ long old_mcaloff = MODCAL_OFFSET (old_hdr);
+ long newtext_size = new_hdr.a_text - old_dataddr;
+ long newdata1_size = (unsigned long)dynamic_beg - new_dataddr;
+ long dyn_size = (EXEC_ALIGN (old_hdr.a_text) + old_hdr.a_data)
+ - (unsigned long)dynamic_beg;
+ long newdata2_size = (unsigned long)current_break
+ - ((unsigned long)dynamic_beg + dyn_size);
+ long pad_size =
+ MASK_UP (current_break, n_pagsiz) - ((unsigned long) current_break);
+
+#ifdef DEBUG
+ printf ("current break is %#lx\n", current_break);
+
+ printf ("old_dataddr = %#lx, dynamic_beg = %#lx\n",
+ old_dataddr, dynamic_beg);
+#endif
+
+ /*
+ * First, write the text segment with new header -- copy
+ * everything until the start of the data segment from the old
+ * file
+ */
+#ifdef DEBUG
+ printf ("copying %#lx bytes of text from 0\n", old_datoff);
+#endif
+ unexec_copy (new_fd, old_fd, 0, 0, old_datoff);
+ /* pad out the text segment */
+#ifdef DEBUG
+ printf ( "text pad size is %#x\n", old_dataddr - old_hdr.a_text);
+#endif
+ unexec_pad (new_fd, old_dataddr - old_hdr.a_text);
+
+ /*
+ * Update debug header spoo
+ */
+ if (new_hdr.a_extension > 0)
+ {
+ new_hdr.a_extension += LESYM_OFFSET(new_hdr) - LESYM_OFFSET(old_hdr);
+ }
+
+ /*
+ * go back and write the new header.
+ */
+ unexec_write (new_fd, 0, (char *) &new_hdr, sizeof (new_hdr));
+
+
+ /*
+ * Copy the part of the data segment which becomes text from the
+ * running image.
+ */
+#ifdef DEBUG
+ printf ("copying %#lx bytes of new text from %#lx to position %#lx\n",
+ newtext_size, old_dataddr, TEXT_OFFSET(new_hdr) + old_dataddr);
+#endif
+ unexec_write (new_fd, TEXT_OFFSET(new_hdr) + old_dataddr,
+ (caddr_t)old_dataddr, newtext_size);
+
+#ifdef DEBUG
+ printf ("new DATA_OFFSET is %#lx\n", new_datoff);
+#endif
+
+ /*
+ * Copy the part of the old data segment which will be data
+ * in the new executable (before the dynamic stuff)
+ * from the running image.
+ */
+#ifdef DEBUG
+ printf ("copying %#lx bytes of data from %#lx to position %#lx\n",
+ newdata1_size, new_dataddr, new_datoff);
+#endif
+ unexec_write (new_fd, new_datoff, (caddr_t)new_dataddr, newdata1_size);
+
+ /* copy the dynamic part of the data segment from the old executable */
+ if (dyn_size)
+ {
+#ifdef DEBUG
+ printf ("copying %#lx bytes of dyn data from executable"
+ " at address %#lx to position %#lx\n",
+ dyn_size, dynamic_beg, new_datoff + newdata1_size);
+#endif
+ unexec_copy (new_fd, old_fd, old_datoff + newtext_size + newdata1_size,
+ new_datoff + newdata1_size, dyn_size);
+ }
+
+ /* copy remaining data (old bss) from the running image */
+#ifdef DEBUG
+ printf ("copying %#lx bytes of data from %#lx to position %#lx\n",
+ newdata2_size, new_dataddr + newdata1_size + dyn_size,
+ new_datoff + newdata1_size + dyn_size);
+#endif
+ unexec_write (new_fd, new_datoff + newdata1_size + dyn_size,
+ (caddr_t)(new_dataddr + newdata1_size + dyn_size),
+ newdata2_size);
+
+ /* pad out the data segment */
+#ifdef DEBUG
+ printf ( "pad size is %#x\n", pad_size);
+#endif
+ unexec_pad (new_fd, pad_size);
+
+ /* Finally, copy the rest of the junk from the old file. */
+#ifdef DEBUG
+ printf ("Copying %#lx bytes of junk from %#lx (old) to %#lx (new)\n",
+ old_buf.st_size - old_mcaloff, old_mcaloff, new_mcaloff);
+#endif
+ unexec_copy (new_fd, old_fd, old_mcaloff, new_mcaloff,
+ old_buf.st_size - old_mcaloff);
+
+ {
+ long curpos, offset;
+ struct _debug_header dhdr;
+ int new_header_delta;
+
+ new_header_delta = LESYM_OFFSET(new_hdr) - LESYM_OFFSET(old_hdr);
+ if ((new_header_delta > 0) &&
+ ((offset = EXT_OFFSET(old_hdr)) > 0))
+ {
+ curpos = lseek(new_fd, 0, SEEK_CUR);
+ lseek(old_fd, offset, 0);
+ if (read(old_fd, &dhdr, sizeof(dhdr)) == sizeof(dhdr))
+ {
+ dhdr.header_offset += new_header_delta;
+ dhdr.gntt_offset += new_header_delta;
+ dhdr.lntt_offset += new_header_delta;
+ dhdr.slt_offset += new_header_delta;
+ dhdr.vt_offset += new_header_delta;
+ dhdr.xt_offset += new_header_delta;
+ lseek(new_fd, EXT_OFFSET(new_hdr), SEEK_SET);
+ if (write(new_fd, &dhdr, sizeof(dhdr)) != sizeof(dhdr))
+ {
+ unexec_error("Unable to write debug information to \"%s\"\n",
+ 1, new_name);
+ }
+ lseek(new_fd, curpos, SEEK_SET);
+ }
+ else
+ {
+ unexec_error("Unable to read debug information from \"%s\"\n",
+ 1, old_name);
+ }
+ }
+ }
+ }
+
+
+ /* make the output file executable -- then quit */
+ unexec_fchmod (new_fd, 0755);
+ close (old_fd);
+ close (new_fd);
+ return 0;
+}
+
+
+int
+run_time_remap (char *dummy)
+{
+ unsigned long current_sbrk = (unsigned long) sbrk (0);
+
+ if (sbrk_of_0_at_unexec < current_sbrk)
+ fprintf (stderr, "Absurd new brk addr = 0x%x (current = 0x%x)\n",
+ sbrk_of_0_at_unexec, current_sbrk);
+ else
+ {
+ errno = 0;
+ if (brk ((caddr_t) sbrk_of_0_at_unexec))
+ fprintf (stderr, "failed to change brk addr to 0x%x: %s\n",
+ sbrk_of_0_at_unexec, SYS_ERR);
+ }
+
+ return 0;
+}
projects / chise / xemacs-chise.git- / blobdiff