src/unexw32.c

   1 /* unexec for GNU Emacs on Windows NT.
   2    Copyright (C) 1994 Free Software Foundation, Inc.
   3
   4 This file is part of GNU Emacs.
   5
   6 GNU Emacs is free software; you can redistribute it and/or modify
   7 it under the terms of the GNU General Public License as published by
   8 the Free Software Foundation; either version 2, or (at your option)
   9 any later version.
  10
  11 GNU Emacs is distributed in the hope that it will be useful,
  12 but WITHOUT ANY WARRANTY; without even the implied warranty of
  13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14 GNU General Public License for more details.
  15
  16 You should have received a copy of the GNU General Public License
  17 along with GNU Emacs; see the file COPYING.  If not, write to
  18 the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
  19 Boston, MA 02111-1307, USA.
  20
  21    Geoff Voelker (voelker@cs.washington.edu)                         8-12-94
  22 */
  23
  24 #include <config.h>
  25
  26 #include <stdlib.h>     /* _fmode */
  27 #include <stdio.h>
  28 #include <fcntl.h>
  29 #include <time.h>
  30 #include <windows.h>
  31
  32 /* Include relevant definitions from IMAGEHLP.H, which can be found
  33    in \\win32sdk\mstools\samples\image\include\imagehlp.h. */
  34
  35 PIMAGE_NT_HEADERS
  36 (__stdcall * pfnCheckSumMappedFile) (LPVOID BaseAddress,
  37                                     DWORD FileLength,
  38                                     LPDWORD HeaderSum,
  39                                     LPDWORD CheckSum);
  40
  41 extern BOOL ctrl_c_handler (unsigned long type);
  42
  43 extern char my_begdata[];
  44 extern char my_edata[];
  45 extern char my_begbss[];
  46 extern char my_endbss[];
  47 extern char *my_begbss_static;
  48 extern char *my_endbss_static;
  49
  50 #include "w32heap.h"
  51
  52 #undef min
  53 #undef max
  54 #define min(x, y) (((x) < (y)) ? (x) : (y))
  55 #define max(x, y) (((x) > (y)) ? (x) : (y))
  56
  57 /* Basically, our "initialized" flag.  */
  58 BOOL using_dynamic_heap = FALSE;
  59
  60 int open_input_file (file_data *p_file, char *name);
  61 int open_output_file (file_data *p_file, char *name, unsigned long size);
  62 void close_file_data (file_data *p_file);
  63
  64 void get_section_info (file_data *p_file);
  65 void copy_executable_and_dump_data (file_data *, file_data *);
  66 void dump_bss_and_heap (file_data *p_infile, file_data *p_outfile);
  67
  68 /* Cached info about the .data section in the executable.  */
  69 PIMAGE_SECTION_HEADER data_section;
  70 PCHAR  data_start = 0;
  71 DWORD  data_size = 0;
  72
  73 /* Cached info about the .bss section in the executable.  */
  74 PIMAGE_SECTION_HEADER bss_section;
  75 PCHAR  bss_start = 0;
  76 DWORD  bss_size = 0;
  77 DWORD  extra_bss_size = 0;
  78 /* bss data that is static might be discontiguous from non-static.  */
  79 PIMAGE_SECTION_HEADER bss_section_static;
  80 PCHAR  bss_start_static = 0;
  81 DWORD  bss_size_static = 0;
  82 DWORD  extra_bss_size_static = 0;
  83
  84 PIMAGE_SECTION_HEADER heap_section;
  85
  86 #ifdef HAVE_NTGUI
  87 HINSTANCE hinst = NULL;
  88 HINSTANCE hprevinst = NULL;
  89 LPSTR lpCmdLine = "";
  90 int nCmdShow = 0;
  91 #endif /* HAVE_NTGUI */
  92
  93 /* Startup code for running on NT.  When we are running as the dumped
  94    version, we need to bootstrap our heap and .bss section into our
  95    address space before we can actually hand off control to the startup
  96    code supplied by NT (primarily because that code relies upon malloc ()).  */
  97 void
  98 _start (void)
  99 {
 100   extern void mainCRTStartup (void);
 101
 102 #if 1
 103   /* Give us a way to debug problems with crashes on startup when
 104      running under the MSVC profiler. */
 105   if (GetEnvironmentVariable ("EMACS_DEBUG", NULL, 0) > 0)
 106     DebugBreak ();
 107 #endif
 108
 109   /* Cache system info, e.g., the NT page size.  */
 110   cache_system_info ();
 111
 112   /* Grab our malloc arena space now, before CRT starts up. */
 113   init_heap ();
 114
 115   /* The default behavior is to treat files as binary and patch up
 116      text files appropriately, in accordance with the MSDOS code.  */
 117   _fmode = O_BINARY;
 118
 119   /* This prevents ctrl-c's in shells running while we're suspended from
 120      having us exit.  */
 121   SetConsoleCtrlHandler ((PHANDLER_ROUTINE) ctrl_c_handler, TRUE);
 122
 123   /* Prevent Emacs from being locked up (eg. in batch mode) when
 124      accessing devices that aren't mounted (eg. removable media drives).  */
 125   SetErrorMode (SEM_FAILCRITICALERRORS);
 126
 127   /* Invoke the NT CRT startup routine now that our housecleaning
 128      is finished.  */
 129 #ifdef HAVE_NTGUI
 130   /* determine WinMain args like crt0.c does */
 131   hinst = GetModuleHandle(NULL);
 132   lpCmdLine = GetCommandLine();
 133   nCmdShow = SW_SHOWDEFAULT;
 134 #endif
 135   mainCRTStartup ();
 136 }
 137
 138
 139 /* File handling.  */
 140
 141 int
 142 open_input_file (file_data *p_file, char *filename)
 143 {
 144   HANDLE file;
 145   HANDLE file_mapping;
 146   void  *file_base;
 147   unsigned long size, upper_size;
 148
 149   file = CreateFile (filename, GENERIC_READ, FILE_SHARE_READ, NULL,
 150                      OPEN_EXISTING, FILE_ATTRIBUTE_NORMAL, 0);
 151   if (file == INVALID_HANDLE_VALUE)
 152     return FALSE;
 153
 154   size = GetFileSize (file, &upper_size);
 155   file_mapping = CreateFileMapping (file, NULL, PAGE_READONLY,
 156                                     0, size, NULL);
 157   if (!file_mapping)
 158     return FALSE;
 159
 160   file_base = MapViewOfFile (file_mapping, FILE_MAP_READ, 0, 0, size);
 161   if (file_base == 0)
 162     return FALSE;
 163
 164   p_file->name = filename;
 165   p_file->size = size;
 166   p_file->file = file;
 167   p_file->file_mapping = file_mapping;
 168   p_file->file_base = file_base;
 169
 170   return TRUE;
 171 }
 172
 173 int
 174 open_output_file (file_data *p_file, char *filename, unsigned long size)
 175 {
 176   HANDLE file;
 177   HANDLE file_mapping;
 178   void  *file_base;
 179
 180   file = CreateFile (filename, GENERIC_READ | GENERIC_WRITE, 0, NULL,
 181                      CREATE_ALWAYS, FILE_ATTRIBUTE_NORMAL, 0);
 182   if (file == INVALID_HANDLE_VALUE)
 183     return FALSE;
 184
 185   file_mapping = CreateFileMapping (file, NULL, PAGE_READWRITE,
 186                                     0, size, NULL);
 187   if (!file_mapping)
 188     return FALSE;
 189
 190   file_base = MapViewOfFile (file_mapping, FILE_MAP_WRITE, 0, 0, size);
 191   if (file_base == 0)
 192     return FALSE;
 193
 194   p_file->name = filename;
 195   p_file->size = size;
 196   p_file->file = file;
 197   p_file->file_mapping = file_mapping;
 198   p_file->file_base = file_base;
 199
 200   return TRUE;
 201 }
 202
 203 /* Close the system structures associated with the given file.  */
 204 void
 205 close_file_data (file_data *p_file)
 206 {
 207   UnmapViewOfFile (p_file->file_base);
 208   CloseHandle (p_file->file_mapping);
 209   /* For the case of output files, set final size.  */
 210   SetFilePointer (p_file->file, p_file->size, NULL, FILE_BEGIN);
 211   SetEndOfFile (p_file->file);
 212   CloseHandle (p_file->file);
 213 }
 214
 215
 216 /* Routines to manipulate NT executable file sections.  */
 217
 218 /* Return pointer to section header for named section. */
 219 IMAGE_SECTION_HEADER *
 220 find_section (char * name, IMAGE_NT_HEADERS * nt_header)
 221 {
 222   PIMAGE_SECTION_HEADER section;
 223   int i;
 224
 225   section = IMAGE_FIRST_SECTION (nt_header);
 226
 227   for (i = 0; i < nt_header->FileHeader.NumberOfSections; i++)
 228     {
 229       if (strcmp (section->Name, name) == 0)
 230         return section;
 231       section++;
 232     }
 233   return NULL;
 234 }
 235
 236 /* Return pointer to section header for section containing the given
 237    relative virtual address. */
 238 IMAGE_SECTION_HEADER *
 239 rva_to_section (DWORD rva, IMAGE_NT_HEADERS * nt_header)
 240 {
 241   PIMAGE_SECTION_HEADER section;
 242   int i;
 243
 244   section = IMAGE_FIRST_SECTION (nt_header);
 245
 246   for (i = 0; i < nt_header->FileHeader.NumberOfSections; i++)
 247     {
 248       /* Some linkers (eg. the NT SDK linker I believe) swapped the
 249          meaning of these two values - or rather, they ignored
 250          VirtualSize entirely and always set it to zero.  This affects
 251          some very old exes (eg. gzip dated Dec 1993).  Since
 252          w32_executable_type relies on this function to work reliably,
 253          we need to cope with this.  */
 254       DWORD real_size = max (section->SizeOfRawData,
 255                              section->Misc.VirtualSize);
 256       if (rva >= section->VirtualAddress
 257           && rva < section->VirtualAddress + real_size)
 258         return section;
 259       section++;
 260     }
 261   return NULL;
 262 }
 263
 264 /* Return pointer to section header for section containing the given
 265    offset in its raw data area. */
 266 IMAGE_SECTION_HEADER *
 267 offset_to_section (DWORD offset, IMAGE_NT_HEADERS * nt_header)
 268 {
 269   PIMAGE_SECTION_HEADER section;
 270   int i;
 271
 272   section = IMAGE_FIRST_SECTION (nt_header);
 273
 274   for (i = 0; i < nt_header->FileHeader.NumberOfSections; i++)
 275     {
 276       if (offset >= section->PointerToRawData
 277           && offset < section->PointerToRawData + section->SizeOfRawData)
 278         return section;
 279       section++;
 280     }
 281   return NULL;
 282 }
 283
 284 /* Return offset to an object in dst, given offset in src.  We assume
 285    there is at least one section in both src and dst images, and that
 286    the some sections may have been added to dst (after sections in src).  */
 287 DWORD
 288 relocate_offset (DWORD offset,
 289                  IMAGE_NT_HEADERS * src_nt_header,
 290                  IMAGE_NT_HEADERS * dst_nt_header)
 291 {
 292   PIMAGE_SECTION_HEADER src_section = IMAGE_FIRST_SECTION (src_nt_header);
 293   PIMAGE_SECTION_HEADER dst_section = IMAGE_FIRST_SECTION (dst_nt_header);
 294   int i = 0;
 295
 296   while (offset >= src_section->PointerToRawData)
 297     {
 298       if (offset < src_section->PointerToRawData + src_section->SizeOfRawData)
 299         break;
 300       i++;
 301       if (i == src_nt_header->FileHeader.NumberOfSections)
 302         {
 303           /* Handle offsets after the last section.  */
 304           dst_section = IMAGE_FIRST_SECTION (dst_nt_header);
 305           dst_section += dst_nt_header->FileHeader.NumberOfSections - 1;
 306           while (dst_section->PointerToRawData == 0)
 307             dst_section--;
 308           while (src_section->PointerToRawData == 0)
 309             src_section--;
 310           return offset
 311             + (dst_section->PointerToRawData + dst_section->SizeOfRawData)
 312             - (src_section->PointerToRawData + src_section->SizeOfRawData);
 313         }
 314       src_section++;
 315       dst_section++;
 316     }
 317   return offset +
 318     (dst_section->PointerToRawData - src_section->PointerToRawData);
 319 }
 320
 321 #define OFFSET_TO_RVA(offset, section) \
 322           (section->VirtualAddress + ((DWORD)(offset) - section->PointerToRawData))
 323
 324 #define RVA_TO_OFFSET(rva, section) \
 325           (section->PointerToRawData + ((DWORD)(rva) - section->VirtualAddress))
 326
 327 #define RVA_TO_SECTION_OFFSET(rva, section) \
 328           ((DWORD)(rva) - section->VirtualAddress)
 329
 330 /* Convert address in executing image to RVA.  */
 331 #define PTR_TO_RVA(ptr) ((DWORD)(ptr) - (DWORD) GetModuleHandle (NULL))
 332
 333 #define PTR_TO_OFFSET(ptr, pfile_data) \
 334           ((unsigned char *)(ptr) - (pfile_data)->file_base)
 335
 336 #define OFFSET_TO_PTR(offset, pfile_data) \
 337           ((pfile_data)->file_base + (DWORD)(offset))
 338
 339
 340 /* Flip through the executable and cache the info necessary for dumping.  */
 341 void
 342 get_section_info (file_data *p_infile)
 343 {
 344   PIMAGE_DOS_HEADER dos_header;
 345   PIMAGE_NT_HEADERS nt_header;
 346   PIMAGE_SECTION_HEADER section;
 347   int overlap;
 348
 349   dos_header = (PIMAGE_DOS_HEADER) p_infile->file_base;
 350   if (dos_header->e_magic != IMAGE_DOS_SIGNATURE)
 351     {
 352       printf ("Unknown EXE header in %s...bailing.\n", p_infile->name);
 353       exit (1);
 354     }
 355   nt_header = (PIMAGE_NT_HEADERS) (((unsigned long) dos_header) +
 356                                    dos_header->e_lfanew);
 357   if (nt_header == NULL)
 358     {
 359       printf ("Failed to find IMAGE_NT_HEADER in %s...bailing.\n",
 360              p_infile->name);
 361       exit (1);
 362     }
 363
 364   /* Check the NT header signature ...  */
 365   if (nt_header->Signature != IMAGE_NT_SIGNATURE)
 366     {
 367       printf ("Invalid IMAGE_NT_SIGNATURE 0x%x in %s...bailing.\n",
 368               nt_header->Signature, p_infile->name);
 369       exit (1);
 370     }
 371
 372   /* Locate the ".data" and ".bss" sections for Emacs.  (Note that the
 373      actual section names are probably different from these, and might
 374      actually be the same section.)
 375
 376      We do this as follows: first we determine the virtual address
 377      ranges in this process for the data and bss variables that we wish
 378      to preserve.  Then we map these VAs to the section entries in the
 379      source image.  Finally, we determine the new size of the raw data
 380      area for the bss section, so we can make the new image the correct
 381      size.  */
 382
 383   /* We arrange for the Emacs initialized data to be in a separate
 384      section if possible, because we cannot rely on my_begdata and
 385      my_edata marking out the full extent of the initialized data, at
 386      least on the Alpha where the linker freely reorders variables
 387      across libraries.  If we can arrange for this, all we need to do is
 388      find the start and size of the EMDATA section.  */
 389   data_section = find_section ("EMDATA", nt_header);
 390   if (data_section)
 391     {
 392       data_start = (char *) nt_header->OptionalHeader.ImageBase +
 393         data_section->VirtualAddress;
 394       data_size = data_section->Misc.VirtualSize;
 395     }
 396   else
 397     {
 398       /* Fallback on the old method if compiler doesn't support the
 399          data_set #pragma (or its equivalent).  */
 400       data_start = my_begdata;
 401       data_size = my_edata - my_begdata;
 402       data_section = rva_to_section (PTR_TO_RVA (my_begdata), nt_header);
 403       if (data_section != rva_to_section (PTR_TO_RVA (my_edata), nt_header))
 404         {
 405           printf ("Initialized data is not in a single section...bailing\n");
 406           exit (1);
 407         }
 408     }
 409
 410   /* As noted in lastfile.c, the Alpha (but not the Intel) MSVC linker
 411      globally segregates all static and public bss data (ie. across all
 412      linked modules, not just per module), so we must take both static
 413      and public bss areas into account to determine the true extent of
 414      the bss area used by Emacs.
 415
 416      To be strictly correct, we dump the static and public bss areas
 417      used by Emacs separately if non-overlapping (since otherwise we are
 418      dumping bss data belonging to system libraries, eg. the static bss
 419      system data on the Alpha).  */
 420
 421   bss_start = my_begbss;
 422   bss_size = my_endbss - my_begbss;
 423   bss_section = rva_to_section (PTR_TO_RVA (my_begbss), nt_header);
 424   if (bss_section != rva_to_section (PTR_TO_RVA (my_endbss), nt_header))
 425     {
 426       printf ("Uninitialized data is not in a single section...bailing\n");
 427       exit (1);
 428     }
 429   /* Compute how much the .bss section's raw data will grow.  */
 430   extra_bss_size =
 431     ROUND_UP (RVA_TO_SECTION_OFFSET (PTR_TO_RVA (my_endbss), bss_section),
 432               nt_header->OptionalHeader.FileAlignment)
 433     - bss_section->SizeOfRawData;
 434
 435   bss_start_static = my_begbss_static;
 436   bss_size_static = my_endbss_static - my_begbss_static;
 437   bss_section_static = rva_to_section (PTR_TO_RVA (my_begbss_static), nt_header);
 438   if (bss_section_static != rva_to_section (PTR_TO_RVA (my_endbss_static), nt_header))
 439     {
 440       printf ("Uninitialized static data is not in a single section...bailing\n");
 441       exit (1);
 442     }
 443   /* Compute how much the static .bss section's raw data will grow.  */
 444   extra_bss_size_static =
 445     ROUND_UP (RVA_TO_SECTION_OFFSET (PTR_TO_RVA (my_endbss_static), bss_section_static),
 446               nt_header->OptionalHeader.FileAlignment)
 447     - bss_section_static->SizeOfRawData;
 448
 449   /* Combine the bss sections into one if they overlap.  */
 450 #ifdef _ALPHA_
 451   overlap = 1;                  /* force all bss data to be dumped */
 452 #else
 453   overlap = 0;
 454 #endif
 455   if (bss_start < bss_start_static)
 456     {
 457       if (bss_start_static < bss_start + bss_size)
 458         overlap = 1;
 459     }
 460   else
 461     {
 462       if (bss_start < bss_start_static + bss_size_static)
 463         overlap = 1;
 464     }
 465   if (overlap)
 466     {
 467       if (bss_section != bss_section_static)
 468         {
 469           printf ("BSS data not in a single section...bailing\n");
 470           exit (1);
 471         }
 472       bss_start = min (bss_start, bss_start_static);
 473       bss_size = max (my_endbss, my_endbss_static) - bss_start;
 474       bss_section_static = 0;
 475       extra_bss_size_static = 0;
 476     }
 477
 478   heap_section = rva_to_section (PTR_TO_RVA (get_heap_start ()), nt_header);
 479 }
 480
 481
 482 /* The dump routines.  */
 483
 484 void
 485 copy_executable_and_dump_data (file_data *p_infile,
 486                                file_data *p_outfile)
 487 {
 488   unsigned char *dst, *dst_save;
 489   PIMAGE_DOS_HEADER dos_header;
 490   PIMAGE_NT_HEADERS nt_header;
 491   PIMAGE_NT_HEADERS dst_nt_header;
 492   PIMAGE_SECTION_HEADER section;
 493   PIMAGE_SECTION_HEADER dst_section;
 494   DWORD offset;
 495   int i;
 496
 497 #define COPY_CHUNK(message, src, size)                                          \
 498   do {                                                                          \
 499     unsigned char *s = (void *)(src);                                           \
 500     unsigned long count = (size);                                               \
 501     printf ("%s\n", (message));                                                 \
 502     printf ("\t0x%08x Offset in input file.\n", s - p_infile->file_base);       \
 503     printf ("\t0x%08x Offset in output file.\n", dst - p_outfile->file_base);   \
 504     printf ("\t0x%08x Size in bytes.\n", count);                                \
 505     memcpy (dst, s, count);                                                     \
 506     dst += count;                                                               \
 507   } while (0)
 508
 509 #define COPY_PROC_CHUNK(message, src, size)                                     \
 510   do {                                                                          \
 511     unsigned char *s = (void *)(src);                                           \
 512     unsigned long count = (size);                                               \
 513     printf ("%s\n", (message));                                                 \
 514     printf ("\t0x%08x Address in process.\n", s);                               \
 515     printf ("\t0x%08x Offset in output file.\n", dst - p_outfile->file_base);   \
 516     printf ("\t0x%08x Size in bytes.\n", count);                                \
 517     memcpy (dst, s, count);                                                     \
 518     dst += count;                                                               \
 519   } while (0)
 520
 521 #define DST_TO_OFFSET()  PTR_TO_OFFSET (dst, p_outfile)
 522 #define ROUND_UP_DST(align) \
 523   (dst = p_outfile->file_base + ROUND_UP (DST_TO_OFFSET (), (align)))
 524 #define ROUND_UP_DST_AND_ZERO(align)                                            \
 525   do {                                                                          \
 526     unsigned char *newdst = p_outfile->file_base                                \
 527       + ROUND_UP (DST_TO_OFFSET (), (align));                                   \
 528     /* Zero the alignment slop; it may actually initialize real data.  */       \
 529     memset (dst, 0, newdst - dst);                                              \
 530     dst = newdst;                                                               \
 531   } while (0)
 532
 533   /* Copy the source image sequentially, ie. section by section after
 534      copying the headers and section table, to simplify the process of
 535      dumping the raw data for the bss and heap sections.
 536
 537      Note that dst is updated implicitly by each COPY_CHUNK.  */
 538
 539   dos_header = (PIMAGE_DOS_HEADER) p_infile->file_base;
 540   nt_header = (PIMAGE_NT_HEADERS) (((unsigned long) dos_header) +
 541                                    dos_header->e_lfanew);
 542   section = IMAGE_FIRST_SECTION (nt_header);
 543
 544   dst = (unsigned char *) p_outfile->file_base;
 545
 546   COPY_CHUNK ("Copying DOS header...", dos_header,
 547               (DWORD) nt_header - (DWORD) dos_header);
 548   dst_nt_header = (PIMAGE_NT_HEADERS) dst;
 549   COPY_CHUNK ("Copying NT header...", nt_header,
 550               (DWORD) section - (DWORD) nt_header);
 551   dst_section = (PIMAGE_SECTION_HEADER) dst;
 552   COPY_CHUNK ("Copying section table...", section,
 553               nt_header->FileHeader.NumberOfSections * sizeof (*section));
 554
 555   /* Align the first section's raw data area, and set the header size
 556      field accordingly.  */
 557   ROUND_UP_DST_AND_ZERO (dst_nt_header->OptionalHeader.FileAlignment);
 558   dst_nt_header->OptionalHeader.SizeOfHeaders = DST_TO_OFFSET ();
 559
 560   for (i = 0; i < nt_header->FileHeader.NumberOfSections; i++)
 561     {
 562       char msg[100];
 563       sprintf (msg, "Copying raw data for %s...", section->Name);
 564
 565       dst_save = dst;
 566
 567       /* Update the file-relative offset for this section's raw data (if
 568          it has any) in case things have been relocated; we will update
 569          the other offsets below once we know where everything is.  */
 570       if (dst_section->PointerToRawData)
 571         dst_section->PointerToRawData = DST_TO_OFFSET ();
 572
 573       /* Can always copy the original raw data.  */
 574       COPY_CHUNK
 575         (msg, OFFSET_TO_PTR (section->PointerToRawData, p_infile),
 576          section->SizeOfRawData);
 577       /* Ensure alignment slop is zeroed.  */
 578       ROUND_UP_DST_AND_ZERO (dst_nt_header->OptionalHeader.FileAlignment);
 579
 580       /* Note that various sections below may be aliases.  */
 581       if (section == data_section)
 582         {
 583           dst = dst_save
 584             + RVA_TO_SECTION_OFFSET (PTR_TO_RVA (data_start), dst_section);
 585           COPY_PROC_CHUNK ("Dumping initialized data...", data_start, data_size);
 586           dst = dst_save + dst_section->SizeOfRawData;
 587         }
 588       if (section == bss_section)
 589         {
 590           /* Dump contents of bss variables, adjusting the section's raw
 591              data size as necessary.  */
 592           dst = dst_save
 593             + RVA_TO_SECTION_OFFSET (PTR_TO_RVA (bss_start), dst_section);
 594           COPY_PROC_CHUNK ("Dumping bss data...", bss_start, bss_size);
 595           ROUND_UP_DST (dst_nt_header->OptionalHeader.FileAlignment);
 596           dst_section->PointerToRawData = PTR_TO_OFFSET (dst_save, p_outfile);
 597           /* Determine new size of raw data area.  */
 598           dst = max (dst, dst_save + dst_section->SizeOfRawData);
 599           dst_section->SizeOfRawData = dst - dst_save;
 600           dst_section->Characteristics &= ~IMAGE_SCN_CNT_UNINITIALIZED_DATA;
 601           dst_section->Characteristics |= IMAGE_SCN_CNT_INITIALIZED_DATA;
 602         }
 603       if (section == bss_section_static)
 604         {
 605           /* Dump contents of static bss variables, adjusting the
 606              section's raw data size as necessary.  */
 607           dst = dst_save
 608             + RVA_TO_SECTION_OFFSET (PTR_TO_RVA (bss_start_static), dst_section);
 609           COPY_PROC_CHUNK ("Dumping static bss data...", bss_start_static, bss_size_static);
 610           ROUND_UP_DST (dst_nt_header->OptionalHeader.FileAlignment);
 611           dst_section->PointerToRawData = PTR_TO_OFFSET (dst_save, p_outfile);
 612           /* Determine new size of raw data area.  */
 613           dst = max (dst, dst_save + dst_section->SizeOfRawData);
 614           dst_section->SizeOfRawData = dst - dst_save;
 615           dst_section->Characteristics &= ~IMAGE_SCN_CNT_UNINITIALIZED_DATA;
 616           dst_section->Characteristics |= IMAGE_SCN_CNT_INITIALIZED_DATA;
 617         }
 618       if (section == heap_section)
 619         {
 620           DWORD heap_start = (DWORD) get_heap_start ();
 621           DWORD heap_size = get_committed_heap_size ();
 622
 623           /* Dump the used portion of the predump heap, adjusting the
 624              section's size to the appropriate size.  */
 625           dst = dst_save
 626             + RVA_TO_SECTION_OFFSET (PTR_TO_RVA (heap_start), dst_section);
 627           COPY_PROC_CHUNK ("Dumping heap...", heap_start, heap_size);
 628           ROUND_UP_DST (dst_nt_header->OptionalHeader.FileAlignment);
 629           dst_section->PointerToRawData = PTR_TO_OFFSET (dst_save, p_outfile);
 630           /* Determine new size of raw data area.  */
 631           dst = max (dst, dst_save + dst_section->SizeOfRawData);
 632           dst_section->SizeOfRawData = dst - dst_save;
 633           /* Reduce the size of the heap section to fit (must be last
 634              section).  */
 635           dst_nt_header->OptionalHeader.SizeOfImage -=
 636             dst_section->Misc.VirtualSize
 637             - ROUND_UP (dst_section->SizeOfRawData,
 638                         dst_nt_header->OptionalHeader.SectionAlignment);
 639           dst_section->Misc.VirtualSize =
 640             ROUND_UP (dst_section->SizeOfRawData,
 641                       dst_nt_header->OptionalHeader.SectionAlignment);
 642           dst_section->Characteristics &= ~IMAGE_SCN_CNT_UNINITIALIZED_DATA;
 643           dst_section->Characteristics |= IMAGE_SCN_CNT_INITIALIZED_DATA;
 644         }
 645
 646       /* Align the section's raw data area.  */
 647       ROUND_UP_DST (dst_nt_header->OptionalHeader.FileAlignment);
 648
 649       section++;
 650       dst_section++;
 651     }
 652
 653   /* Copy remainder of source image.  */
 654   do
 655     section--;
 656   while (section->PointerToRawData == 0);
 657   offset = ROUND_UP (section->PointerToRawData + section->SizeOfRawData,
 658                      nt_header->OptionalHeader.FileAlignment);
 659   COPY_CHUNK
 660     ("Copying remainder of executable...",
 661      OFFSET_TO_PTR (offset, p_infile),
 662      p_infile->size - offset);
 663
 664   /* Final size for new image.  */
 665   p_outfile->size = DST_TO_OFFSET ();
 666
 667   /* Now patch up remaining file-relative offsets.  */
 668   section = IMAGE_FIRST_SECTION (nt_header);
 669   dst_section = IMAGE_FIRST_SECTION (dst_nt_header);
 670
 671 #define ADJUST_OFFSET(var)                                              \
 672   do {                                                                  \
 673     if ((var) != 0)                                                     \
 674       (var) = relocate_offset ((var), nt_header, dst_nt_header);        \
 675   } while (0)
 676
 677   dst_nt_header->OptionalHeader.SizeOfInitializedData = 0;
 678   dst_nt_header->OptionalHeader.SizeOfUninitializedData = 0;
 679   for (i = 0; i < dst_nt_header->FileHeader.NumberOfSections; i++)
 680     {
 681       /* Recompute data sizes for completeness.  */
 682       if (dst_section[i].Characteristics & IMAGE_SCN_CNT_INITIALIZED_DATA)
 683         dst_nt_header->OptionalHeader.SizeOfInitializedData +=
 684           ROUND_UP (dst_section[i].Misc.VirtualSize, dst_nt_header->OptionalHeader.FileAlignment);
 685       else if (dst_section[i].Characteristics & IMAGE_SCN_CNT_UNINITIALIZED_DATA)
 686         dst_nt_header->OptionalHeader.SizeOfUninitializedData +=
 687           ROUND_UP (dst_section[i].Misc.VirtualSize, dst_nt_header->OptionalHeader.FileAlignment);
 688
 689       ADJUST_OFFSET (dst_section[i].PointerToLinenumbers);
 690     }
 691
 692   ADJUST_OFFSET (dst_nt_header->FileHeader.PointerToSymbolTable);
 693
 694   /* Update offsets in debug directory entries. */
 695   {
 696     IMAGE_DATA_DIRECTORY debug_dir =
 697       dst_nt_header->OptionalHeader.DataDirectory[IMAGE_DIRECTORY_ENTRY_DEBUG];
 698     PIMAGE_DEBUG_DIRECTORY debug_entry;
 699
 700     section = rva_to_section (debug_dir.VirtualAddress, dst_nt_header);
 701     if (section)
 702       {
 703         debug_entry = (PIMAGE_DEBUG_DIRECTORY)
 704           (RVA_TO_OFFSET (debug_dir.VirtualAddress, section) + p_outfile->file_base);
 705         debug_dir.Size /= sizeof (IMAGE_DEBUG_DIRECTORY);
 706
 707         for (i = 0; i < debug_dir.Size; i++, debug_entry++)
 708           ADJUST_OFFSET (debug_entry->PointerToRawData);
 709       }
 710   }
 711 }
 712
 713
 714 /* Dump out .data and .bss sections into a new executable.  */
 715 void
 716 unexec (char *new_name, char *old_name, void *start_data, void *start_bss,
 717         void *entry_address)
 718 {
 719   file_data in_file, out_file;
 720   char out_filename[MAX_PATH], in_filename[MAX_PATH];
 721   unsigned long size;
 722   char *p;
 723   char *q;
 724
 725   /* Ignore old_name, and get our actual location from the OS.  */
 726   if (!GetModuleFileName (NULL, in_filename, MAX_PATH))
 727     abort ();
 728   dostounix_filename (in_filename);
 729   strcpy (out_filename, in_filename);
 730
 731   /* Change the base of the output filename to match the requested name.  */
 732   if ((p = strrchr (out_filename, '/')) == NULL)
 733     abort ();
 734   /* The filenames have already been expanded, and will be in Unix
 735      format, so it is safe to expect an absolute name.  */
 736   if ((q = strrchr (new_name, '/')) == NULL)
 737     abort ();
 738   strcpy (p, q);
 739
 740   /* Make sure that the output filename has the ".exe" extension...patch
 741      it up if not.  */
 742   p = out_filename + strlen (out_filename) - 4;
 743   if (strcmp (p, ".exe"))
 744     strcat (out_filename, ".exe");
 745
 746   printf ("Dumping from %s\n", in_filename);
 747   printf ("          to %s\n", out_filename);
 748
 749   /* We need to round off our heap to NT's page size.  */
 750   round_heap (get_page_size ());
 751
 752   /* Open the undumped executable file.  */
 753   if (!open_input_file (&in_file, in_filename))
 754     {
 755       printf ("Failed to open %s (%d)...bailing.\n",
 756               in_filename, GetLastError ());
 757       exit (1);
 758     }
 759
 760   /* Get the interesting section info, like start and size of .bss...  */
 761   get_section_info (&in_file);
 762
 763   /* The size of the dumped executable is the size of the original
 764      executable plus the size of the heap and the size of the .bss section.  */
 765   size = in_file.size +
 766     get_committed_heap_size () +
 767     extra_bss_size +
 768     extra_bss_size_static;
 769   if (!open_output_file (&out_file, out_filename, size))
 770     {
 771       printf ("Failed to open %s (%d)...bailing.\n",
 772               out_filename, GetLastError ());
 773       exit (1);
 774     }
 775
 776   /* Set the flag (before dumping).  */
 777   using_dynamic_heap = TRUE;
 778
 779   copy_executable_and_dump_data (&in_file, &out_file);
 780
 781   /* Patch up header fields; profiler is picky about this. */
 782   {
 783     PIMAGE_DOS_HEADER dos_header;
 784     PIMAGE_NT_HEADERS nt_header;
 785     HANDLE hImagehelp = LoadLibrary ("imagehlp.dll");
 786     DWORD  headersum;
 787     DWORD  checksum;
 788
 789     dos_header = (PIMAGE_DOS_HEADER) out_file.file_base;
 790     nt_header = (PIMAGE_NT_HEADERS) ((char *) dos_header + dos_header->e_lfanew);
 791
 792     nt_header->OptionalHeader.CheckSum = 0;
 793 //    nt_header->FileHeader.TimeDateStamp = time (NULL);
 794 //    dos_header->e_cp = size / 512;
 795 //    nt_header->OptionalHeader.SizeOfImage = size;
 796
 797     pfnCheckSumMappedFile = (void *) GetProcAddress (hImagehelp, "CheckSumMappedFile");
 798     if (pfnCheckSumMappedFile)
 799       {
 800 //      nt_header->FileHeader.TimeDateStamp = time (NULL);
 801         pfnCheckSumMappedFile (out_file.file_base,
 802                                out_file.size,
 803                                &headersum,
 804                                &checksum);
 805         nt_header->OptionalHeader.CheckSum = checksum;
 806       }
 807     FreeLibrary (hImagehelp);
 808   }
 809
 810   close_file_data (&in_file);
 811   close_file_data (&out_file);
 812 }
 813
 814 /* eof */