Major rewrite to support cleaner method of dumping; a

static "bss" section is used for heap space during preload, and
bss data is now written to the proper section area when dumping.
(need_to_recreate_heap): Renamed to using_dynamic_heap.
(heap_index_in_executable): Obsolete variable removed.
(data_section): New variable.
(data_start_va): Renamed to data_start.
(data_start_file): Obsolete variable removed.
(bss_section):
(extra_bss_size):
(bss_section_static):
(bss_start_static):
(bss_size_static):
(extra_bss_size_static):
(heap_section): New variables.
(_start): Remove code based on old unexec method.  Call init_heap
to initialize sbrk heap.
(close_file_data): Update size of file when closing, so that
unexec doesn't have to work out exact size in advance.
(get_bss_info_from_map_file):
(get_section_size): Obsolete functions removed.
(rva_to_section): Fix minor bug, and add a work-around for a bug
in very old linkers.
(offset_to_section):
(relocate_offset): New functions.
(OFFSET_TO_RVA):
(RVA_TO_OFFSET):
(RVA_TO_SECTION_OFFSET):
(PTR_TO_RVA):
(PTR_TO_OFFSET):
(OFFSET_TO_PTR): New macros.
(get_section_info): Modify to support new unexec method;
determines address ranges in process that need dumping, and COFF
sections where data will be dumped.  Allows for static and global
bss data to be in separate ranges.  No longer relies on knowledge
of section names.
(copy_executable_and_dump_data_section): Renamed
copy_executable_and_dump_data.  Completely rewritten to copy
executable section by section, so that raw data areas can be
expanded to hold dumped data as necessary.  Allows for bss data to
be in same section as initialized data.  Reduces size of static
heap section to that used during preload.
(dump_bss_and_heap):
(w32_fatal_reload_error):
(read_in_bss):
(map_in_heap): Obsolete functions removed.
(unexec): Rounds off preload heap to nearest page rather than
virtual allocation unit.  Modified to match other changes.

1 files changed, 470 insertions, 438 deletions

diff --git a/src/unexw32.c b/src/unexw32.c
index f7314e79207..4cdffac287d 100644
--- a/src/unexw32.c
+++ b/src/unexw32.c
@@ -55,27 +55,33 @@ extern char *my_endbss_static;
 #define max(x, y) (((x) > (y)) ? (x) : (y))
 
 /* Basically, our "initialized" flag.  */
-BOOL need_to_recreate_heap = FALSE;
-
-/* So we can find our heap in the file to recreate it.  */
-unsigned long heap_index_in_executable = 0;
+BOOL using_dynamic_heap = FALSE;
 
 int open_input_file (file_data *p_file, char *name);
 int open_output_file (file_data *p_file, char *name, unsigned long size);
 void close_file_data (file_data *p_file);
 
 void get_section_info (file_data *p_file);
-void copy_executable_and_dump_data_section (file_data *, file_data *);
+void copy_executable_and_dump_data (file_data *, file_data *);
 void dump_bss_and_heap (file_data *p_infile, file_data *p_outfile);
 
 /* Cached info about the .data section in the executable.  */
-PUCHAR data_start_va = 0;
-DWORD  data_start_file = 0;
+PIMAGE_SECTION_HEADER data_section;
+PUCHAR data_start = 0;
 DWORD  data_size = 0;
 
 /* Cached info about the .bss section in the executable.  */
+PIMAGE_SECTION_HEADER bss_section;
 PUCHAR bss_start = 0;
 DWORD  bss_size = 0;
+DWORD  extra_bss_size = 0;
+/* bss data that is static might be discontiguous from non-static.  */
+PIMAGE_SECTION_HEADER bss_section_static;
+PUCHAR bss_start_static = 0;
+DWORD  bss_size_static = 0;
+DWORD  extra_bss_size_static = 0;
+
+PIMAGE_SECTION_HEADER heap_section;
 
 #ifdef HAVE_NTGUI
 HINSTANCE hinst = NULL;
@@ -103,49 +109,8 @@ _start (void)
   /* Cache system info, e.g., the NT page size.  */
   cache_system_info ();
 
-  /* If we're a dumped version of emacs then we need to recreate
-     our heap and play tricks with our .bss section.  Do this before
-     start up.  (WARNING:  Do not put any code before this section
-     that relies upon malloc () and runs in the dumped version.  It
-     won't work.)  */
-  if (need_to_recreate_heap) 
-    {
-      char executable_path[MAX_PATH];
-
-      if (GetModuleFileName (NULL, executable_path, MAX_PATH) == 0) 
-        {
-          printf ("Failed to find path for executable.\n");
-          exit (1);
-        }
-
-#if 1
-      /* To allow profiling, make sure executable_path names the .exe
-         file, not the ._xe file created by the profiler which contains
-         extra code that makes the stored exe offsets incorrect.  (This
-         will not be necessary when unexec properly extends the .bss (or
-         .data as appropriate) section to include the dumped bss data,
-         and dumps the heap into a proper section of its own.)  */
-      {
-        char * p = strrchr (executable_path, '.');
-        if (p && p[1] == '_')
-          p[1] = 'e';
-      }
-
-      /* Using HiProf profiler, exe name is different still. */
-      {
-        char * p = strrchr (executable_path, '\\');
-        strcpy (p, "\\emacs.exe");
-      }
-#endif
-
-      recreate_heap (executable_path);
-      need_to_recreate_heap = FALSE;
-    }
-  else
-    {
-      /* Grab our malloc arena space now, before CRT starts up. */
-      sbrk (0);
-    }
+  /* Grab our malloc arena space now, before CRT starts up. */
+  init_heap ();
 
   /* The default behavior is to treat files as binary and patch up
      text files appropriately, in accordance with the MSDOS code.  */
@@ -170,100 +135,9 @@ _start (void)
   mainCRTStartup ();
 }
 
-/* Dump out .data and .bss sections into a new executable.  */
-void
-unexec (char *new_name, char *old_name, void *start_data, void *start_bss,
-        void *entry_address)
-{
-  file_data in_file, out_file;
-  char out_filename[MAX_PATH], in_filename[MAX_PATH];
-  unsigned long size;
-  char *ptr;
-  
-  /* Make sure that the input and output filenames have the
-     ".exe" extension...patch them up if they don't.  */
-  strcpy (in_filename, old_name);
-  ptr = in_filename + strlen (in_filename) - 4;
-  if (strcmp (ptr, ".exe"))
-    strcat (in_filename, ".exe");
-
-  strcpy (out_filename, new_name);
-  ptr = out_filename + strlen (out_filename) - 4;
-  if (strcmp (ptr, ".exe"))
-    strcat (out_filename, ".exe");
-
-  printf ("Dumping from %s\n", in_filename);
-  printf ("          to %s\n", out_filename);
-
-  /* We need to round off our heap to NT's allocation unit (64KB).  */
-  round_heap (get_allocation_unit ());
-
-  /* Open the undumped executable file.  */
-  if (!open_input_file (&in_file, in_filename))
-    {
-      printf ("Failed to open %s (%d)...bailing.\n", 
-              in_filename, GetLastError ());
-      exit (1);
-    }
-
-  /* Get the interesting section info, like start and size of .bss...  */
-  get_section_info (&in_file);
-
-  /* The size of the dumped executable is the size of the original
-     executable plus the size of the heap and the size of the .bss section.  */
-  heap_index_in_executable = (unsigned long)
-    round_to_next ((unsigned char *) in_file.size, get_allocation_unit ());
-  size = heap_index_in_executable + get_committed_heap_size () + bss_size;
-  if (!open_output_file (&out_file, out_filename, size))
-    {
-      printf ("Failed to open %s (%d)...bailing.\n", 
-              out_filename, GetLastError ());
-      exit (1);
-    }
-
-  /* Set the flag (before dumping).  */
-  need_to_recreate_heap = TRUE;
-
-  copy_executable_and_dump_data_section (&in_file, &out_file);
-  dump_bss_and_heap (&in_file, &out_file);
-
-  /* Patch up header fields; profiler is picky about this. */
-  {
-    PIMAGE_DOS_HEADER dos_header;
-    PIMAGE_NT_HEADERS nt_header;
-    HANDLE hImagehelp = LoadLibrary ("imagehlp.dll");
-    DWORD  headersum;
-    DWORD  checksum;
-
-    dos_header = (PIMAGE_DOS_HEADER) out_file.file_base;
-    nt_header = (PIMAGE_NT_HEADERS) ((char *) dos_header + dos_header->e_lfanew);
-
-    nt_header->OptionalHeader.CheckSum = 0;
-//    nt_header->FileHeader.TimeDateStamp = time (NULL);
-//    dos_header->e_cp = size / 512;
-//    nt_header->OptionalHeader.SizeOfImage = size;
-
-    pfnCheckSumMappedFile = (void *) GetProcAddress (hImagehelp, "CheckSumMappedFile");
-    if (pfnCheckSumMappedFile)
-      {
-//      nt_header->FileHeader.TimeDateStamp = time (NULL);
-        pfnCheckSumMappedFile (out_file.file_base,
-                               out_file.size,
-                               &headersum,
-                               &checksum);
-        nt_header->OptionalHeader.CheckSum = checksum;
-      }
-    FreeLibrary (hImagehelp);
-  }
-
-  close_file_data (&in_file);
-  close_file_data (&out_file);
-}
-
 
 /* File handling.  */
 
-
 int
 open_input_file (file_data *p_file, char *filename)
 {
@@ -330,64 +204,17 @@ open_output_file (file_data *p_file, char *filename, unsigned long size)
 void
 close_file_data (file_data *p_file)
 {
-    UnmapViewOfFile (p_file->file_base);
-    CloseHandle (p_file->file_mapping);
-    CloseHandle (p_file->file);
+  UnmapViewOfFile (p_file->file_base);
+  CloseHandle (p_file->file_mapping);
+  /* For the case of output files, set final size.  */
+  SetFilePointer (p_file->file, p_file->size, NULL, FILE_BEGIN);
+  SetEndOfFile (p_file->file);
+  CloseHandle (p_file->file);
 }
 
 
 /* Routines to manipulate NT executable file sections.  */
 
-#ifdef SEPARATE_BSS_SECTION
-static void
-get_bss_info_from_map_file (file_data *p_infile, PUCHAR *p_bss_start, 
-                            DWORD *p_bss_size)
-{
-  int n, start, len;
-  char map_filename[MAX_PATH];
-  char buffer[256];
-  FILE *map;
-
-  /* Overwrite the .exe extension on the executable file name with
-     the .map extension.  */
-  strcpy (map_filename, p_infile->name);
-  n = strlen (map_filename) - 3;
-  strcpy (&map_filename[n], "map");
-
-  map = fopen (map_filename, "r");
-  if (!map)
-    {
-      printf ("Failed to open map file %s, error %d...bailing out.\n",
-              map_filename, GetLastError ());
-      exit (-1);
-    }
-
-  while (fgets (buffer, sizeof (buffer), map))
-    {
-      if (!(strstr (buffer, ".bss") && strstr (buffer, "DATA")))
-        continue;
-      n = sscanf (buffer, " %*d:%x %x", &start, &len);
-      if (n != 2)
-        {
-          printf ("Failed to scan the .bss section line:\n%s", buffer);
-          exit (-1);
-        }
-      break;
-    }
-  *p_bss_start = (PUCHAR) start;
-  *p_bss_size = (DWORD) len;
-}
-#endif
-
-unsigned long
-get_section_size (PIMAGE_SECTION_HEADER p_section)
-{
-  /* The true section size, before rounding.  Some linkers swap the
-     meaning of these two values.  */
-  return min (p_section->SizeOfRawData,
-              p_section->Misc.VirtualSize);
-}
-
 /* Return pointer to section header for named section. */
 IMAGE_SECTION_HEADER *
 find_section (char * name, IMAGE_NT_HEADERS * nt_header)
@@ -418,14 +245,97 @@ rva_to_section (DWORD rva, IMAGE_NT_HEADERS * nt_header)
 
   for (i = 0; i < nt_header->FileHeader.NumberOfSections; i++)
     {
+      /* Some linkers (eg. the NT SDK linker I believe) swapped the
+         meaning of these two values - or rather, they ignored
+         VirtualSize entirely and always set it to zero.  This affects
+         some very old exes (eg. gzip dated Dec 1993).  Since
+         w32_executable_type relies on this function to work reliably,
+         we need to cope with this.  */
+      DWORD real_size = max (section->SizeOfRawData,
+                             section->Misc.VirtualSize);
       if (rva >= section->VirtualAddress
-          && rva < section->VirtualAddress + section->SizeOfRawData)
+          && rva < section->VirtualAddress + real_size)
+        return section;
+      section++;
+    }
+  return NULL;
+}
+
+/* Return pointer to section header for section containing the given
+   offset in its raw data area. */
+IMAGE_SECTION_HEADER *
+offset_to_section (DWORD offset, IMAGE_NT_HEADERS * nt_header)
+{
+  PIMAGE_SECTION_HEADER section;
+  int i;
+
+  section = IMAGE_FIRST_SECTION (nt_header);
+
+  for (i = 0; i < nt_header->FileHeader.NumberOfSections; i++)
+    {
+      if (offset >= section->PointerToRawData
+          && offset < section->PointerToRawData + section->SizeOfRawData)
         return section;
       section++;
     }
   return NULL;
 }
 
+/* Return offset to an object in dst, given offset in src.  We assume
+   there is at least one section in both src and dst images, and that
+   the some sections may have been added to dst (after sections in src).  */
+static DWORD
+relocate_offset (DWORD offset,
+                 IMAGE_NT_HEADERS * src_nt_header,
+                 IMAGE_NT_HEADERS * dst_nt_header)
+{
+  PIMAGE_SECTION_HEADER src_section = IMAGE_FIRST_SECTION (src_nt_header);
+  PIMAGE_SECTION_HEADER dst_section = IMAGE_FIRST_SECTION (dst_nt_header);
+  int i = 0;
+
+  while (offset >= src_section->PointerToRawData)
+    {
+      if (offset < src_section->PointerToRawData + src_section->SizeOfRawData)
+        break;
+      i++;
+      if (i == src_nt_header->FileHeader.NumberOfSections)
+        {
+          /* Handle offsets after the last section.  */
+          dst_section = IMAGE_FIRST_SECTION (dst_nt_header);
+          dst_section += dst_nt_header->FileHeader.NumberOfSections - 1;
+          while (dst_section->PointerToRawData == 0)
+            dst_section--;
+          while (src_section->PointerToRawData == 0)
+            src_section--;
+          return offset
+            + (dst_section->PointerToRawData + dst_section->SizeOfRawData)
+            - (src_section->PointerToRawData + src_section->SizeOfRawData);
+        }
+      src_section++;
+      dst_section++;
+    }
+  return offset +
+    (dst_section->PointerToRawData - src_section->PointerToRawData);
+}
+
+#define OFFSET_TO_RVA(offset, section) \
+          (section->VirtualAddress + ((DWORD)(offset) - section->PointerToRawData))
+
+#define RVA_TO_OFFSET(rva, section) \
+          (section->PointerToRawData + ((DWORD)(rva) - section->VirtualAddress))
+
+#define RVA_TO_SECTION_OFFSET(rva, section) \
+          ((DWORD)(rva) - section->VirtualAddress)
+
+/* Convert address in executing image to RVA.  */
+#define PTR_TO_RVA(ptr) ((DWORD)(ptr) - (DWORD) GetModuleHandle (NULL))
+
+#define PTR_TO_OFFSET(ptr, pfile_data) \
+          ((char *)(ptr) - (pfile_data)->file_base)
+
+#define OFFSET_TO_PTR(offset, pfile_data) \
+          ((pfile_data)->file_base + (DWORD)(offset))
+
 
 /* Flip through the executable and cache the info necessary for dumping.  */
 static void
@@ -433,9 +343,8 @@ get_section_info (file_data *p_infile)
 {
   PIMAGE_DOS_HEADER dos_header;
   PIMAGE_NT_HEADERS nt_header;
-  PIMAGE_SECTION_HEADER section, data_section;
-  unsigned char *ptr;
-  int i;
+  PIMAGE_SECTION_HEADER section;
+  int overlap;
   
   dos_header = (PIMAGE_DOS_HEADER) p_infile->file_base;
   if (dos_header->e_magic != IMAGE_DOS_SIGNATURE) 
@@ -457,281 +366,404 @@ get_section_info (file_data *p_infile)
     {
       printf ("Invalid IMAGE_NT_SIGNATURE 0x%x in %s...bailing.\n",
               nt_header->Signature, p_infile->name);
+      exit (1);
     }
 
-  /* Flip through the sections for .data and .bss ...  */
-  section = (PIMAGE_SECTION_HEADER) IMAGE_FIRST_SECTION (nt_header);
-  for (i = 0; i < nt_header->FileHeader.NumberOfSections; i++) 
+  /* Locate the ".data" and ".bss" sections for Emacs.  (Note that the
+     actual section names are probably different from these, and might
+     actually be the same section.)
+
+     We do this as follows: first we determine the virtual address
+     ranges in this process for the data and bss variables that we wish
+     to preserve.  Then we map these VAs to the section entries in the
+     source image.  Finally, we determine the new size of the raw data
+     area for the bss section, so we can make the new image the correct
+     size.  */
+
+  data_start = my_begdata;
+  data_size = my_edata - my_begdata;
+  data_section = rva_to_section (PTR_TO_RVA (my_begdata), nt_header);
+  if (data_section != rva_to_section (PTR_TO_RVA (my_edata), nt_header))
     {
-#ifdef SEPARATE_BSS_SECTION
-      if (!strcmp (section->Name, ".bss")) 
+      printf ("Initialized data is not in a single section...bailing\n");
+      exit (1);
+    }
+
+  /* As noted in lastfile.c, the Alpha (but not the Intel) MSVC linker
+     globally segregates all static and public bss data (ie. across all
+     linked modules, not just per module), so we must take both static
+     and public bss areas into account to determine the true extent of
+     the bss area used by Emacs.
+
+     To be strictly correct, we dump the static and public bss areas
+     used by Emacs separately if non-overlapping (since otherwise we are
+     dumping bss data belonging to system libraries, eg. the static bss
+     system data on the Alpha).  */
+
+  bss_start = my_begbss;
+  bss_size = my_endbss - my_begbss;
+  bss_section = rva_to_section (PTR_TO_RVA (my_begbss), nt_header);
+  if (bss_section != rva_to_section (PTR_TO_RVA (my_endbss), nt_header))
+    {
+      printf ("Uninitialized data is not in a single section...bailing\n");
+      exit (1);
+    }
+  /* Compute how much the .bss section's raw data will grow.  */
+  extra_bss_size =
+    ROUND_UP (RVA_TO_SECTION_OFFSET (PTR_TO_RVA (my_endbss), bss_section),
+              nt_header->OptionalHeader.FileAlignment)
+    - bss_section->SizeOfRawData;
+
+  bss_start_static = my_begbss_static;
+  bss_size_static = my_endbss_static - my_begbss_static;
+  bss_section_static = rva_to_section (PTR_TO_RVA (my_begbss_static), nt_header);
+  if (bss_section_static != rva_to_section (PTR_TO_RVA (my_endbss_static), nt_header))
+    {
+      printf ("Uninitialized static data is not in a single section...bailing\n");
+      exit (1);
+    }
+  /* Compute how much the static .bss section's raw data will grow.  */
+  extra_bss_size_static =
+    ROUND_UP (RVA_TO_SECTION_OFFSET (PTR_TO_RVA (my_endbss_static), bss_section_static),
+              nt_header->OptionalHeader.FileAlignment)
+    - bss_section_static->SizeOfRawData;
+
+  /* Combine the bss sections into one if they overlap.  */
+  overlap = 0;
+  if (bss_start < bss_start_static)
+    {
+      if (bss_start_static < bss_start + bss_size)
+        overlap = 1;
+    }
+  else
+    {
+      if (bss_start < bss_start_static + bss_size_static)
+        overlap = 1;
+    }
+  if (overlap)
+    {
+      if (bss_section != bss_section_static)
         {
-          /* The .bss section.  */
-          ptr = (char *) nt_header->OptionalHeader.ImageBase +
-            section->VirtualAddress;
-          bss_start = ptr;
-          bss_size = get_section_size (section);
+          printf ("BSS data not in a single section...bailing\n");
+          exit (1);
         }
-#endif
-#if 0
-      if (!strcmp (section->Name, ".data")) 
+      bss_start = min (bss_start, bss_start_static);
+      bss_size = max (my_endbss, my_endbss_static) - bss_start;
+      bss_section_static = 0;
+      extra_bss_size_static = 0;
+    }
+
+  heap_section = rva_to_section (PTR_TO_RVA (get_heap_start ()), nt_header);
+}
+
+
+/* The dump routines.  */
+
+static void
+copy_executable_and_dump_data (file_data *p_infile, 
+                               file_data *p_outfile)
+{
+  unsigned char *dst, *dst_save;
+  PIMAGE_DOS_HEADER dos_header;
+  PIMAGE_NT_HEADERS nt_header;
+  PIMAGE_NT_HEADERS dst_nt_header;
+  PIMAGE_SECTION_HEADER section;
+  PIMAGE_SECTION_HEADER dst_section;
+  DWORD offset;
+  int i;
+
+#define COPY_CHUNK(message, src, size)                                          \
+  do {                                                                          \
+    unsigned char *s = (void *)(src);                                           \
+    unsigned long count = (size);                                               \
+    printf ("%s\n", (message));                                                 \
+    printf ("\t0x%08x Offset in input file.\n", s - p_infile->file_base);       \
+    printf ("\t0x%08x Offset in output file.\n", dst - p_outfile->file_base);   \
+    printf ("\t0x%08x Size in bytes.\n", count);                                \
+    memcpy (dst, s, count);                                                     \
+    dst += count;                                                               \
+  } while (0)
+
+#define COPY_PROC_CHUNK(message, src, size)                                     \
+  do {                                                                          \
+    unsigned char *s = (void *)(src);                                           \
+    unsigned long count = (size);                                               \
+    printf ("%s\n", (message));                                                 \
+    printf ("\t0x%08x Address in process.\n", s);                               \
+    printf ("\t0x%08x Offset in output file.\n", dst - p_outfile->file_base);   \
+    printf ("\t0x%08x Size in bytes.\n", count);                                \
+    memcpy (dst, s, count);                                                     \
+    dst += count;                                                               \
+  } while (0)
+
+#define DST_TO_OFFSET()  PTR_TO_OFFSET (dst, p_outfile)
+#define ROUND_UP_DST(align) \
+  (dst = p_outfile->file_base + ROUND_UP (DST_TO_OFFSET (), (align)))
+
+  /* Copy the source image sequentially, ie. section by section after
+     copying the headers and section table, to simplify the process of
+     dumping the raw data for the bss and heap sections.
+
+     Note that dst is updated implicitly by each COPY_CHUNK.  */
+
+  dos_header = (PIMAGE_DOS_HEADER) p_infile->file_base;
+  nt_header = (PIMAGE_NT_HEADERS) (((unsigned long) dos_header) + 
+                                   dos_header->e_lfanew);
+  section = IMAGE_FIRST_SECTION (nt_header);
+ 
+  dst = (unsigned char *) p_outfile->file_base;
+
+  COPY_CHUNK ("Copying DOS header...", dos_header,
+              (DWORD) nt_header - (DWORD) dos_header);
+  dst_nt_header = (PIMAGE_NT_HEADERS) dst;
+  COPY_CHUNK ("Copying NT header...", nt_header,
+              (DWORD) section - (DWORD) nt_header);
+  dst_section = (PIMAGE_SECTION_HEADER) dst;
+  COPY_CHUNK ("Copying section table...", section,
+              nt_header->FileHeader.NumberOfSections * sizeof (*section));
+
+  for (i = 0; i < nt_header->FileHeader.NumberOfSections; i++)
+    {
+      char msg[100];
+      sprintf (msg, "Copying raw data for %s...", section->Name);
+
+      /* Align the section's raw data area.  */
+      ROUND_UP_DST (dst_nt_header->OptionalHeader.FileAlignment);
+      dst_save = dst;
+
+      /* Update the file-relative offset for this section's raw data (if
+         it has any) in case things have been relocated; we will update
+         the other offsets below once we know where everything is.  */
+      if (dst_section->PointerToRawData)
+        dst_section->PointerToRawData = DST_TO_OFFSET ();
+
+      /* Can always copy the original raw data.  */
+      COPY_CHUNK
+        (msg, OFFSET_TO_PTR (section->PointerToRawData, p_infile),
+         section->SizeOfRawData);
+
+      /* Note that various sections below may be aliases.  */
+      if (section == data_section)
         {
-          /* From lastfile.c  */
-          extern char my_edata[];
-
-          /* The .data section.  */
-          data_section = section;
-          ptr = (char *) nt_header->OptionalHeader.ImageBase +
-            section->VirtualAddress;
-          data_start_va = ptr;
-          data_start_file = section->PointerToRawData;
-
-          /* We want to only write Emacs data back to the executable,
-             not any of the library data (if library data is included,
-             then a dumped Emacs won't run on system versions other
-             than the one Emacs was dumped on).  */
-          data_size = my_edata - data_start_va;
+          dst = dst_save
+            + RVA_TO_SECTION_OFFSET (PTR_TO_RVA (data_start), dst_section);
+          COPY_PROC_CHUNK ("Dumping initialized data...", data_start, data_size);
+          dst = dst_save + dst_section->SizeOfRawData;
         }
-#else
-      if (!strcmp (section->Name, "EMDATA")) 
+      if (section == bss_section)
         {
-          /* The Emacs initialized data section.  */
-          data_section = section;
-          ptr = (char *) nt_header->OptionalHeader.ImageBase +
-            section->VirtualAddress;
-          data_start_va = ptr;
-          data_start_file = section->PointerToRawData;
-
-          /* Write back the full section.  */
-          data_size = get_section_size (section);
+          /* Dump contents of bss variables, adjusting the section's raw
+             data size as necessary.  */
+          dst = dst_save
+            + RVA_TO_SECTION_OFFSET (PTR_TO_RVA (bss_start), dst_section);
+          COPY_PROC_CHUNK ("Dumping bss data...", bss_start, bss_size);
+          ROUND_UP_DST (dst_nt_header->OptionalHeader.FileAlignment);
+          dst_section->PointerToRawData = PTR_TO_OFFSET (dst_save, p_outfile);
+          /* Determine new size of raw data area.  */
+          dst = max (dst, dst_save + dst_section->SizeOfRawData);
+          dst_section->SizeOfRawData = dst - dst_save;
+          dst_section->Characteristics &= ~IMAGE_SCN_CNT_UNINITIALIZED_DATA;
+          dst_section->Characteristics |= IMAGE_SCN_CNT_INITIALIZED_DATA;
         }
-#endif
+      if (section == bss_section_static)
+        {
+          /* Dump contents of static bss variables, adjusting the
+             section's raw data size as necessary.  */
+          dst = dst_save
+            + RVA_TO_SECTION_OFFSET (PTR_TO_RVA (bss_start_static), dst_section);
+          COPY_PROC_CHUNK ("Dumping static bss data...", bss_start_static, bss_size_static);
+          ROUND_UP_DST (dst_nt_header->OptionalHeader.FileAlignment);
+          dst_section->PointerToRawData = PTR_TO_OFFSET (dst_save, p_outfile);
+          /* Determine new size of raw data area.  */
+          dst = max (dst, dst_save + dst_section->SizeOfRawData);
+          dst_section->SizeOfRawData = dst - dst_save;
+          dst_section->Characteristics &= ~IMAGE_SCN_CNT_UNINITIALIZED_DATA;
+          dst_section->Characteristics |= IMAGE_SCN_CNT_INITIALIZED_DATA;
+        }
+      if (section == heap_section)
+        {
+          DWORD heap_start = get_heap_start ();
+          DWORD heap_size = get_committed_heap_size ();
+
+          /* Dump the used portion of the predump heap, adjusting the
+             section's size to the appropriate size.  */
+          dst = dst_save
+            + RVA_TO_SECTION_OFFSET (PTR_TO_RVA (heap_start), dst_section);
+          COPY_PROC_CHUNK ("Dumping heap...", heap_start, heap_size);
+          ROUND_UP_DST (dst_nt_header->OptionalHeader.FileAlignment);
+          dst_section->PointerToRawData = PTR_TO_OFFSET (dst_save, p_outfile);
+          /* Determine new size of raw data area.  */
+          dst = max (dst, dst_save + dst_section->SizeOfRawData);
+          dst_section->SizeOfRawData = dst - dst_save;
+          /* Reduce the size of the heap section to fit (must be last
+             section).  */
+          dst_nt_header->OptionalHeader.SizeOfImage -=
+            dst_section->Misc.VirtualSize
+            - ROUND_UP (dst_section->SizeOfRawData,
+                        dst_nt_header->OptionalHeader.SectionAlignment);
+          dst_section->Misc.VirtualSize =
+            ROUND_UP (dst_section->SizeOfRawData,
+                      dst_nt_header->OptionalHeader.SectionAlignment);
+          dst_section->Characteristics &= ~IMAGE_SCN_CNT_UNINITIALIZED_DATA;
+          dst_section->Characteristics |= IMAGE_SCN_CNT_INITIALIZED_DATA;
+        }
+
       section++;
+      dst_section++;
     }
 
-#ifdef SEPARATE_BSS_SECTION
-  if (bss_start == UNINIT_PTR && bss_size == UNINIT_LONG)
+  /* Pad out the final section raw data area.  */
+  ROUND_UP_DST (dst_nt_header->OptionalHeader.FileAlignment);
+
+  /* Copy remainder of source image.  */
+  do
+    section--;
+  while (section->PointerToRawData == 0);
+  offset = ROUND_UP (section->PointerToRawData + section->SizeOfRawData,
+                     nt_header->OptionalHeader.FileAlignment);
+  COPY_CHUNK
+    ("Copying remainder of executable...",
+     OFFSET_TO_PTR (offset, p_infile),
+     p_infile->size - offset);
+
+  /* Final size for new image.  */
+  p_outfile->size = DST_TO_OFFSET ();
+
+  /* Now patch up remaining file-relative offsets.  */
+  section = IMAGE_FIRST_SECTION (nt_header);
+  dst_section = IMAGE_FIRST_SECTION (dst_nt_header);
+
+#define ADJUST_OFFSET(var)                                              \
+  do {                                                                  \
+    if ((var) != 0)                                                     \
+      (var) = relocate_offset ((var), nt_header, dst_nt_header);        \
+  } while (0)
+
+  dst_nt_header->OptionalHeader.SizeOfInitializedData = 0;
+  dst_nt_header->OptionalHeader.SizeOfUninitializedData = 0;
+  for (i = 0; i < dst_nt_header->FileHeader.NumberOfSections; i++)
     {
-      /* Starting with MSVC 4.0, the .bss section has been eliminated
-         and appended virtually to the end of the .data section.  Our
-         only hint about where the .bss section starts in the address
-         comes from the SizeOfRawData field in the .data section
-         header.  Unfortunately, this field is only approximate, as it
-         is a rounded number and is typically rounded just beyond the
-         start of the .bss section.  To find the start and size of the
-         .bss section exactly, we have to peek into the map file.  */
-      get_bss_info_from_map_file (p_infile, &ptr, &bss_size);
-      bss_start = ptr + nt_header->OptionalHeader.ImageBase
-        + data_section->VirtualAddress;
+      /* Recompute data sizes for completeness.  */
+      if (dst_section[i].Characteristics & IMAGE_SCN_CNT_INITIALIZED_DATA)
+        dst_nt_header->OptionalHeader.SizeOfInitializedData +=
+          ROUND_UP (dst_section[i].Misc.VirtualSize, dst_nt_header->OptionalHeader.FileAlignment);
+      else if (dst_section[i].Characteristics & IMAGE_SCN_CNT_UNINITIALIZED_DATA)
+        dst_nt_header->OptionalHeader.SizeOfUninitializedData +=
+          ROUND_UP (dst_section[i].Misc.VirtualSize, dst_nt_header->OptionalHeader.FileAlignment);
+
+      ADJUST_OFFSET (dst_section[i].PointerToLinenumbers);
     }
-#else
-/* As noted in lastfile.c, the Alpha (but not the Intel) MSVC linker
-   globally segregates all static and public bss data (ie. across all
-   linked modules, not just per module), so we must take both static and
-   public bss areas into account to determine the true extent of the bss
-   area used by Emacs.
-
-   To be strictly correct, we should dump the static and public bss
-   areas used by Emacs separately if non-overlapping (since otherwise we
-   are dumping bss data belonging to system libraries, eg. the static
-   bss system data on the Alpha).  However, in practice this doesn't
-   seem to matter, since presumably the system libraries always
-   reinitialize their bss variables.  */
-  bss_start = min (my_begbss, my_begbss_static);
-  bss_size = max (my_endbss, my_endbss_static) - bss_start;
-#endif
-}
 
+  ADJUST_OFFSET (dst_nt_header->FileHeader.PointerToSymbolTable);
 
-/* The dump routines.  */
+  /* Update offsets in debug directory entries. */
+  {
+    IMAGE_DATA_DIRECTORY debug_dir =
+      dst_nt_header->OptionalHeader.DataDirectory[IMAGE_DIRECTORY_ENTRY_DEBUG];
+    PIMAGE_DEBUG_DIRECTORY debug_entry;
 
-static void
-copy_executable_and_dump_data_section (file_data *p_infile, 
-                                       file_data *p_outfile)
-{
-  unsigned char *data_file, *data_va;
-  unsigned long size, index;
-  
-  /* Get a pointer to where the raw data should go in the executable file.  */
-  data_file = (char *) p_outfile->file_base + data_start_file;
-
-  /* Get a pointer to the raw data in our address space.  */
-  data_va = data_start_va;
-    
-  size = (DWORD) data_file - (DWORD) p_outfile->file_base;
-  printf ("Copying executable up to data section...\n");
-  printf ("\t0x%08x Offset in input file.\n", 0);
-  printf ("\t0x%08x Offset in output file.\n", 0);
-  printf ("\t0x%08x Size in bytes.\n", size);
-  memcpy (p_outfile->file_base, p_infile->file_base, size);
-  
-  size = data_size;
-  printf ("Dumping .data section...\n");
-  printf ("\t0x%08x Address in process.\n", data_va);
-  printf ("\t0x%08x Offset in output file.\n", 
-          data_file - p_outfile->file_base);
-  printf ("\t0x%08x Size in bytes.\n", size);
-  memcpy (data_file, data_va, size);
-  
-  index = (DWORD) data_file + size - (DWORD) p_outfile->file_base;
-  size = p_infile->size - index;
-  printf ("Copying rest of executable...\n");
-  printf ("\t0x%08x Offset in input file.\n", index);
-  printf ("\t0x%08x Offset in output file.\n", index);
-  printf ("\t0x%08x Size in bytes.\n", size);
-  memcpy ((char *) p_outfile->file_base + index, 
-          (char *) p_infile->file_base + index, size);
-}
+    section = rva_to_section (debug_dir.VirtualAddress, dst_nt_header);
+    if (section)
+      {
+        debug_entry = (PIMAGE_DEBUG_DIRECTORY)
+          (RVA_TO_OFFSET (debug_dir.VirtualAddress, section) + p_outfile->file_base);
+        debug_dir.Size /= sizeof (IMAGE_DEBUG_DIRECTORY);
 
-static void
-dump_bss_and_heap (file_data *p_infile, file_data *p_outfile)
-{
-    unsigned char *heap_data, *bss_data;
-    unsigned long size, index;
-
-    printf ("Dumping heap into executable...\n");
-
-    index = heap_index_in_executable;
-    size = get_committed_heap_size ();
-    heap_data = get_heap_start ();
-
-    printf ("\t0x%08x Heap start in process.\n", heap_data);
-    printf ("\t0x%08x Heap offset in executable.\n", index);
-    printf ("\t0x%08x Heap size in bytes.\n", size);
-
-    memcpy ((PUCHAR) p_outfile->file_base + index, heap_data, size);
-
-    printf ("Dumping .bss into executable...\n");
-    
-    index += size;
-    size = bss_size;
-    bss_data = bss_start;
-    
-    printf ("\t0x%08x BSS start in process.\n", bss_data);
-    printf ("\t0x%08x BSS offset in executable.\n", index);
-    printf ("\t0x%08x BSS size in bytes.\n", size);
-    memcpy ((char *) p_outfile->file_base + index, bss_data, size);
+        for (i = 0; i < debug_dir.Size; i++, debug_entry++)
+          ADJUST_OFFSET (debug_entry->PointerToRawData);
+      }
+  }
 }
 
 
-/* Reload and remap routines.  */
-
+/* Dump out .data and .bss sections into a new executable.  */
 void
-w32_fatal_reload_error (char *step)
+unexec (char *new_name, char *old_name, void *start_data, void *start_bss,
+        void *entry_address)
 {
-  int error = GetLastError ();
-  char *buffer = alloca (4096);
-
-  sprintf (buffer, 
-           "Emacs failed to load its dumped heap back into its address space.\n"
-           "The error occurred during the following step:\n\n"
-           "%s\n\n"
-           "GetLastError = %d\n\n"
-           "Heap start:  0x%08x\n"
-           "Heap commit:  0x%08x\n"
-           "Heap end:  0x%08x\n\n"
-           "This error typically happens when the system loads a DLL into\n"
-           "the middle of Emacs' address space, preventing Emacs from\n"
-           "loading its heap there.  If this happens only occasionally, then\n"
-           "you can probably ignore it.  But if it happens so often that\n"
-           "you cannot get Emacs to start reliably, and you think that Emacs\n"
-           "is installed correctly, then you have a couple of options:\n\n"
-           "Emacs correctly, then you have two options:\n\n"
-           "1) You can dump Emacs yourself.  By doing this, you ensure that\n"
-           "Emacs' heap fits around the DLLs in your system.  To dump Emacs,\n"
-           "download the emacs-(version)-undump-(arch) distribution file\n"
-           "from the site where you downloaded the executable distribution.\n\n"
-           "2) You can build Emacs from source.  This is just another way\n"
-           "to dump Emacs on your system.",
-           step, 
-           error,
-           get_heap_start (), 
-           get_heap_start () + get_committed_heap_size (),
-           get_heap_end ());
-
-  MessageBox (NULL,
-              buffer,
-              "Emacs Abort Dialog",
-              MB_OK | MB_ICONEXCLAMATION | MB_TASKMODAL);
-
-  exit (-1);
-}
+  file_data in_file, out_file;
+  char out_filename[MAX_PATH], in_filename[MAX_PATH];
+  unsigned long size;
+  char *ptr;
+  
+  /* Make sure that the input and output filenames have the
+     ".exe" extension...patch them up if they don't.  */
+  strcpy (in_filename, old_name);
+  ptr = in_filename + strlen (in_filename) - 4;
+  if (strcmp (ptr, ".exe"))
+    strcat (in_filename, ".exe");
 
-/* Load the dumped .bss section into the .bss area of our address space.  */
-void
-read_in_bss (char *filename)
-{
-  HANDLE file;
-  unsigned long size, index, n_read, total_read;
-  char   buffer[512], *bss;
-  int    i;
+  strcpy (out_filename, new_name);
+  ptr = out_filename + strlen (out_filename) - 4;
+  if (strcmp (ptr, ".exe"))
+    strcat (out_filename, ".exe");
 
-  file = CreateFile (filename, GENERIC_READ, FILE_SHARE_READ, NULL,
-                     OPEN_EXISTING, FILE_ATTRIBUTE_NORMAL, 0);
-  if (file == INVALID_HANDLE_VALUE) 
-    w32_fatal_reload_error ("Opening Emacs executable file for .bss.");
+  printf ("Dumping from %s\n", in_filename);
+  printf ("          to %s\n", out_filename);
 
-  /* Seek to where the .bss section is tucked away after the heap...  */
-  index = heap_index_in_executable + get_committed_heap_size ();
-  if (SetFilePointer (file, index, NULL, FILE_BEGIN) == 0xFFFFFFFF) 
-    w32_fatal_reload_error ("Seeking to the saved .bss section.");
-  
-  /* Ok, read in the saved .bss section and initialize all 
-     uninitialized variables.  */
-  if (!ReadFile (file, bss_start, bss_size, &n_read, NULL))
-    w32_fatal_reload_error ("Reading the saved .bss section.");
+  /* We need to round off our heap to NT's page size.  */
+  round_heap (get_page_size ());
 
-  CloseHandle (file);
-}
+  /* Open the undumped executable file.  */
+  if (!open_input_file (&in_file, in_filename))
+    {
+      printf ("Failed to open %s (%d)...bailing.\n", 
+              in_filename, GetLastError ());
+      exit (1);
+    }
 
-/* Map the heap dumped into the executable file into our address space.  */
-void 
-map_in_heap (char *filename)
-{
-  HANDLE file;
-  HANDLE file_mapping;
-  void  *file_base;
-  unsigned long size, upper_size, n_read;
-  int    i;
+  /* Get the interesting section info, like start and size of .bss...  */
+  get_section_info (&in_file);
 
-  file = CreateFile (filename, GENERIC_READ, FILE_SHARE_READ, NULL,
-                     OPEN_EXISTING, FILE_ATTRIBUTE_NORMAL, 0);
-  if (file == INVALID_HANDLE_VALUE) 
-    w32_fatal_reload_error ("Opening Emacs executable file for heap.");
-  
-  size = GetFileSize (file, &upper_size);
-  file_mapping = CreateFileMapping (file, NULL, PAGE_WRITECOPY, 
-                                    0, size, NULL);
-  if (!file_mapping) 
-    w32_fatal_reload_error ("Creating file mapping to heap in executable.");
-    
-  size = get_committed_heap_size ();
-  file_base = MapViewOfFileEx (file_mapping, FILE_MAP_COPY, 0, 
-                               heap_index_in_executable, size,
-                               get_heap_start ());
-  if (file_base != 0) 
+  /* The size of the dumped executable is the size of the original
+     executable plus the size of the heap and the size of the .bss section.  */
+  size = in_file.size +
+    get_committed_heap_size () +
+    extra_bss_size +
+    extra_bss_size_static;
+  if (!open_output_file (&out_file, out_filename, size))
     {
-      return;
+      printf ("Failed to open %s (%d)...bailing.\n", 
+              out_filename, GetLastError ());
+      exit (1);
     }
 
-  /* If we don't succeed with the mapping, then copy from the 
-     data into the heap.  */
+  /* Set the flag (before dumping).  */
+  using_dynamic_heap = TRUE;
 
-  CloseHandle (file_mapping);
+  copy_executable_and_dump_data (&in_file, &out_file);
 
-  if (VirtualAlloc (get_heap_start (), get_committed_heap_size (),
-                    MEM_RESERVE | MEM_COMMIT, PAGE_READWRITE) == NULL)
-    w32_fatal_reload_error ("Allocating heap address space.");
+  /* Patch up header fields; profiler is picky about this. */
+  {
+    PIMAGE_DOS_HEADER dos_header;
+    PIMAGE_NT_HEADERS nt_header;
+    HANDLE hImagehelp = LoadLibrary ("imagehlp.dll");
+    DWORD  headersum;
+    DWORD  checksum;
 
-  /* Seek to the location of the heap data in the executable.  */
-  i = heap_index_in_executable;
-  if (SetFilePointer (file, i, NULL, FILE_BEGIN) == 0xFFFFFFFF)
-    w32_fatal_reload_error ("Seeking to saved heap in executable file.");
+    dos_header = (PIMAGE_DOS_HEADER) out_file.file_base;
+    nt_header = (PIMAGE_NT_HEADERS) ((char *) dos_header + dos_header->e_lfanew);
 
-  /* Read in the data.  */
-  if (!ReadFile (file, get_heap_start (), 
-                 get_committed_heap_size (), &n_read, NULL))
-    w32_fatal_reload_error ("Reading saved heap from executable file.");
+    nt_header->OptionalHeader.CheckSum = 0;
+//    nt_header->FileHeader.TimeDateStamp = time (NULL);
+//    dos_header->e_cp = size / 512;
+//    nt_header->OptionalHeader.SizeOfImage = size;
+
+    pfnCheckSumMappedFile = (void *) GetProcAddress (hImagehelp, "CheckSumMappedFile");
+    if (pfnCheckSumMappedFile)
+      {
+//      nt_header->FileHeader.TimeDateStamp = time (NULL);
+        pfnCheckSumMappedFile (out_file.file_base,
+                               out_file.size,
+                               &headersum,
+                               &checksum);
+        nt_header->OptionalHeader.CheckSum = checksum;
+      }
+    FreeLibrary (hImagehelp);
+  }
 
-  CloseHandle (file);
+  close_file_data (&in_file);
+  close_file_data (&out_file);
 }
+
+/* eof */