New file.

1 files changed, 304 insertions, 0 deletions

diff --git a/src/unexcw.c b/src/unexcw.c
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index 00000000000..58e356fdb0d
--- /dev/null
+++ b/src/unexcw.c
@@ -0,0 +1,304 @@
+/* unexec() support for Cygwin;
+   complete rewrite of xemacs Cygwin unexec() code
+
+   Copyright (C) 2004
+   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., 59 Temple Place - Suite 330,
+Boston, MA 02111-1307, USA.  */
+
+#include <config.h>
+#include <lisp.h>
+#include <stdio.h>
+#include <fcntl.h>
+#include <a.out.h>
+#include <unistd.h>
+#include <assert.h>
+
+#define DOTEXE ".exe"
+
+extern int bss_sbrk_did_unexec;
+
+/* emacs symbols that indicate where bss and data end for emacs internals */
+extern char my_endbss[];
+extern char my_edata[];
+
+/*
+** header for Windows executable files
+*/
+typedef struct
+{
+  FILHDR file_header;
+  PEAOUTHDR file_optional_header;
+  SCNHDR section_header[32];
+} exe_header_t;
+
+int debug_unexcw = 0;
+
+/*
+** Read the header from the executable into memory so we can more easily access it.
+*/
+static exe_header_t *
+read_exe_header (int fd, exe_header_t * exe_header_buffer)
+{
+  int i;
+  int ret;
+
+  assert (fd >= 0);
+  assert (exe_header_buffer != 0);
+
+  ret = lseek (fd, 0L, SEEK_SET);
+  assert (ret != -1);
+
+  ret =
+    read (fd, &exe_header_buffer->file_header,
+	  sizeof (exe_header_buffer->file_header));
+  assert (ret == sizeof (exe_header_buffer->file_header));
+
+  assert (exe_header_buffer->file_header.e_magic == 0x5a4d);
+  assert (exe_header_buffer->file_header.nt_signature == 0x4550);
+  assert (exe_header_buffer->file_header.f_magic == 0x014c);
+  assert (exe_header_buffer->file_header.f_nscns > 0);
+  assert (exe_header_buffer->file_header.f_nscns <=
+	  sizeof (exe_header_buffer->section_header) /
+	  sizeof (exe_header_buffer->section_header[0]));
+  assert (exe_header_buffer->file_header.f_opthdr > 0);
+
+  ret =
+    read (fd, &exe_header_buffer->file_optional_header,
+	  sizeof (exe_header_buffer->file_optional_header));
+  assert (ret == sizeof (exe_header_buffer->file_optional_header));
+
+  assert (exe_header_buffer->file_optional_header.magic == 0x010b);
+
+  for (i = 0; i < exe_header_buffer->file_header.f_nscns; ++i)
+    {
+      ret =
+	read (fd, &exe_header_buffer->section_header[i],
+	      sizeof (exe_header_buffer->section_header[i]));
+      assert (ret == sizeof (exe_header_buffer->section_header[i]));
+    }
+
+  return (exe_header_buffer);
+}
+
+/*
+** Fix the dumped emacs executable:
+**
+** - copy .data section data of interest from running executable into
+**   output .exe file
+**
+** - convert .bss section into an initialized data section (like
+**   .data) and copy .bss section data of interest from running
+**   executable into output .exe file
+*/
+static void
+fixup_executable (int fd)
+{
+  exe_header_t exe_header_buffer;
+  exe_header_t *exe_header;
+  int i;
+  int ret;
+  int found_data = 0;
+  int found_bss = 0;
+
+  exe_header = read_exe_header (fd, &exe_header_buffer);
+  assert (exe_header != 0);
+
+  assert (exe_header->file_header.f_nscns > 0);
+  for (i = 0; i < exe_header->file_header.f_nscns; ++i)
+    {
+      unsigned long start_address =
+	exe_header->section_header[i].s_vaddr +
+	exe_header->file_optional_header.ImageBase;
+      unsigned long end_address =
+	exe_header->section_header[i].s_vaddr +
+	exe_header->file_optional_header.ImageBase +
+	exe_header->section_header[i].s_paddr;
+      if (debug_unexcw)
+	printf ("%8s start 0x%08x end 0x%08x\n",
+		exe_header->section_header[i].s_name,
+		start_address, end_address);
+      if (my_edata >= (char *) start_address
+	  && my_edata < (char *) end_address)
+	{
+	  /* data section */
+	  ret =
+	    lseek (fd, (long) (exe_header->section_header[i].s_scnptr),
+		   SEEK_SET);
+	  assert (ret != -1);
+	  ret =
+	    write (fd, (char *) start_address,
+		   my_edata - (char *) start_address);
+	  assert (ret == my_edata - (char *) start_address);
+	  ++found_data;
+	  if (debug_unexcw)
+	    printf ("         .data, mem start 0x%08x mem length %d\n",
+		    start_address, my_edata - (char *) start_address);
+	  if (debug_unexcw)
+	    printf ("         .data, file start %d file length %d\n",
+		    (int) exe_header->section_header[i].s_scnptr,
+		    (int) exe_header->section_header[i].s_paddr);
+	}
+      else if (my_endbss >= (char *) start_address
+	       && my_endbss < (char *) end_address)
+	{
+	  /* bss section */
+	  ++found_bss;
+	  if (exe_header->section_header[i].s_flags & 0x00000080)
+	    {
+	      /* convert uninitialized data section to initialized data section */
+	      struct stat statbuf;
+	      ret = fstat (fd, &statbuf);
+	      assert (ret != -1);
+
+	      exe_header->section_header[i].s_flags &= ~0x00000080;
+	      exe_header->section_header[i].s_flags |= 0x00000040;
+
+	      exe_header->section_header[i].s_scnptr =
+		(statbuf.st_size +
+		 exe_header->file_optional_header.FileAlignment) /
+		exe_header->file_optional_header.FileAlignment *
+		exe_header->file_optional_header.FileAlignment;
+
+	      exe_header->section_header[i].s_size =
+		(exe_header->section_header[i].s_paddr +
+		 exe_header->file_optional_header.FileAlignment) /
+		exe_header->file_optional_header.FileAlignment *
+		exe_header->file_optional_header.FileAlignment;
+
+	      ret =
+		lseek (fd,
+		       (long) (exe_header->section_header[i].s_scnptr +
+			       exe_header->section_header[i].s_size - 1),
+		       SEEK_SET);
+	      assert (ret != -1);
+	      ret = write (fd, "", 1);
+	      assert (ret == 1);
+
+	      ret =
+		lseek (fd,
+		       (long) ((char *) &exe_header->section_header[i] -
+			       (char *) exe_header), SEEK_SET);
+	      assert (ret != -1);
+	      ret =
+		write (fd, &exe_header->section_header[i],
+		       sizeof (exe_header->section_header[i]));
+	      assert (ret == sizeof (exe_header->section_header[i]));
+	      if (debug_unexcw)
+		printf ("         seek to %ld, write %d\n",
+			(long) ((char *) &exe_header->section_header[i] -
+				(char *) exe_header),
+			sizeof (exe_header->section_header[i]));
+	    }
+	  /* write initialized data section */
+	  ret =
+	    lseek (fd, (long) (exe_header->section_header[i].s_scnptr),
+		   SEEK_SET);
+	  assert (ret != -1);
+	  ret =
+	    write (fd, (char *) start_address,
+		   my_endbss - (char *) start_address);
+	  assert (ret == (my_endbss - (char *) start_address));
+	  if (debug_unexcw)
+	    printf ("         .bss, mem start 0x%08x mem length %d\n",
+		    start_address, my_endbss - (char *) start_address);
+	  if (debug_unexcw)
+	    printf ("         .bss, file start %d file length %d\n",
+		    (int) exe_header->section_header[i].s_scnptr,
+		    (int) exe_header->section_header[i].s_paddr);
+	}
+    }
+  assert (found_bss == 1);
+  assert (found_data == 1);
+}
+
+/*
+** Windows likes .exe suffixes on executables.
+*/
+static char *
+add_exe_suffix_if_necessary (const char *name, char *modified)
+{
+  int i = strlen (name);
+  if (i <= (sizeof (DOTEXE) - 1))
+    {
+      sprintf (modified, "%s%s", name, DOTEXE);
+    }
+  else if (!strcasecmp (name + i - (sizeof (DOTEXE) - 1), DOTEXE))
+    {
+      strcpy (modified, name);
+    }
+  else
+    {
+      sprintf (modified, "%s%s", name, DOTEXE);
+    }
+  return (modified);
+}
+
+int
+unexec (char *outfile, char *infile, unsigned start_data, unsigned d1,
+	unsigned d2)
+{
+  char infile_buffer[FILENAME_MAX];
+  char outfile_buffer[FILENAME_MAX];
+  int fd_in;
+  int fd_out;
+  int ret;
+  int ret2;
+
+  if (bss_sbrk_did_unexec)
+    {
+      /* can only dump once */
+      printf ("You can only dump emacs once on this platform.\n");
+      return (1);
+    }
+
+  report_sheap_usage (1);
+
+  infile = add_exe_suffix_if_necessary (infile, infile_buffer);
+  outfile = add_exe_suffix_if_necessary (outfile, outfile_buffer);
+
+  fd_in = open (infile, O_RDONLY | O_BINARY);
+  assert (fd_in >= 0);
+  fd_out = open (outfile, O_RDWR | O_TRUNC | O_CREAT | O_BINARY, 0755);
+  assert (fd_out >= 0);
+  for (;;)
+    {
+      char buffer[4096];
+      ret = read (fd_in, buffer, sizeof (buffer));
+      if (ret == 0)
+	{
+	  /* eof */
+	  break;
+	}
+      assert (ret > 0);
+      /* data */
+      ret2 = write (fd_out, buffer, ret);
+      assert (ret2 == ret);
+    }
+  ret = close (fd_in);
+  assert (ret == 0);
+
+  bss_sbrk_did_unexec = 1;
+  fixup_executable (fd_out);
+  bss_sbrk_did_unexec = 0;
+
+  ret = close (fd_out);
+  assert (ret == 0);
+
+  return (0);
+}