src/unexw32.c

   1 /* unexec for GNU Emacs on Windows NT.
   2    Copyright (C) 1994, 2005 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., 51 Franklin Street, Fifth Floor,
  19 Boston, MA 02110-1301, USA.
  20
  21    Geoff Voelker (voelker@cs.washington.edu)                         8-12-94
  22 */
  23
  24 #include <config.h>
  25
  26 #include <stdio.h>
  27 #include <fcntl.h>
  28 #include <time.h>
  29 #include <windows.h>
  30
  31 /* Include relevant definitions from IMAGEHLP.H, which can be found
  32    in \\win32sdk\mstools\samples\image\include\imagehlp.h. */
  33
  34 PIMAGE_NT_HEADERS
  35 (__stdcall * pfnCheckSumMappedFile) (LPVOID BaseAddress,
  36                                     DWORD FileLength,
  37                                     LPDWORD HeaderSum,
  38                                     LPDWORD CheckSum);
  39
  40 extern BOOL ctrl_c_handler (unsigned long type);
  41
  42 extern char my_begdata[];
  43 extern char my_edata[];
  44 extern char my_begbss[];
  45 extern char my_endbss[];
  46 extern char *my_begbss_static;
  47 extern char *my_endbss_static;
  48
  49 #include "w32heap.h"
  50
  51 #undef min
  52 #undef max
  53 #define min(x, y) (((x) < (y)) ? (x) : (y))
  54 #define max(x, y) (((x) > (y)) ? (x) : (y))
  55
  56 /* Basically, our "initialized" flag.  */
  57 BOOL using_dynamic_heap = FALSE;
  58
  59 int open_input_file (file_data *p_file, char *name);
  60 int open_output_file (file_data *p_file, char *name, unsigned long size);
  61 void close_file_data (file_data *p_file);
  62
  63 void get_section_info (file_data *p_file);
  64 void copy_executable_and_dump_data (file_data *, file_data *);
  65 void dump_bss_and_heap (file_data *p_infile, file_data *p_outfile);
  66
  67 /* Cached info about the .data section in the executable.  */
  68 PIMAGE_SECTION_HEADER data_section;
  69 PCHAR  data_start = 0;
  70 DWORD  data_size = 0;
  71
  72 /* Cached info about the .bss section in the executable.  */
  73 PIMAGE_SECTION_HEADER bss_section;
  74 PCHAR  bss_start = 0;
  75 DWORD  bss_size = 0;
  76 DWORD  extra_bss_size = 0;
  77 /* bss data that is static might be discontiguous from non-static.  */
  78 PIMAGE_SECTION_HEADER bss_section_static;
  79 PCHAR  bss_start_static = 0;
  80 DWORD  bss_size_static = 0;
  81 DWORD  extra_bss_size_static = 0;
  82
  83 PIMAGE_SECTION_HEADER heap_section;
  84
  85 #ifdef HAVE_NTGUI
  86 HINSTANCE hinst = NULL;
  87 HINSTANCE hprevinst = NULL;
  88 LPSTR lpCmdLine = "";
  89 int nCmdShow = 0;
  90 #endif /* HAVE_NTGUI */
  91
  92 /* Startup code for running on NT.  When we are running as the dumped
  93    version, we need to bootstrap our heap and .bss section into our
  94    address space before we can actually hand off control to the startup
  95    code supplied by NT (primarily because that code relies upon malloc ()).  */
  96 void
  97 _start (void)
  98 {
  99   extern void mainCRTStartup (void);
 100
 101 #if 1
 102   /* Give us a way to debug problems with crashes on startup when
 103      running under the MSVC profiler. */
 104   if (GetEnvironmentVariable ("EMACS_DEBUG", NULL, 0) > 0)
 105     DebugBreak ();
 106 #endif
 107
 108   /* Cache system info, e.g., the NT page size.  */
 109   cache_system_info ();
 110
 111   /* Grab our malloc arena space now, before CRT starts up. */
 112   init_heap ();
 113
 114   /* This prevents ctrl-c's in shells running while we're suspended from
 115      having us exit.  */
 116   SetConsoleCtrlHandler ((PHANDLER_ROUTINE) ctrl_c_handler, TRUE);
 117
 118   /* Prevent Emacs from being locked up (eg. in batch mode) when
 119      accessing devices that aren't mounted (eg. removable media drives).  */
 120   SetErrorMode (SEM_FAILCRITICALERRORS);
 121
 122   /* Invoke the NT CRT startup routine now that our housecleaning
 123      is finished.  */
 124 #ifdef HAVE_NTGUI
 125   /* determine WinMain args like crt0.c does */
 126   hinst = GetModuleHandle(NULL);
 127   lpCmdLine = GetCommandLine();
 128   nCmdShow = SW_SHOWDEFAULT;
 129 #endif
 130   mainCRTStartup ();
 131 }
 132
 133
 134 /* File handling.  */
 135
 136 int
 137 open_input_file (file_data *p_file, char *filename)
 138 {
 139   HANDLE file;
 140   HANDLE file_mapping;
 141   void  *file_base;
 142   unsigned long size, upper_size;
 143
 144   file = CreateFile (filename, GENERIC_READ, FILE_SHARE_READ, NULL,
 145                      OPEN_EXISTING, FILE_ATTRIBUTE_NORMAL, 0);
 146   if (file == INVALID_HANDLE_VALUE)
 147     return FALSE;
 148
 149   size = GetFileSize (file, &upper_size);
 150   file_mapping = CreateFileMapping (file, NULL, PAGE_READONLY,
 151                                     0, size, NULL);
 152   if (!file_mapping)
 153     return FALSE;
 154
 155   file_base = MapViewOfFile (file_mapping, FILE_MAP_READ, 0, 0, size);
 156   if (file_base == 0)
 157     return FALSE;
 158
 159   p_file->name = filename;
 160   p_file->size = size;
 161   p_file->file = file;
 162   p_file->file_mapping = file_mapping;
 163   p_file->file_base = file_base;
 164
 165   return TRUE;
 166 }
 167
 168 int
 169 open_output_file (file_data *p_file, char *filename, unsigned long size)
 170 {
 171   HANDLE file;
 172   HANDLE file_mapping;
 173   void  *file_base;
 174
 175   file = CreateFile (filename, GENERIC_READ | GENERIC_WRITE, 0, NULL,
 176                      CREATE_ALWAYS, FILE_ATTRIBUTE_NORMAL, 0);
 177   if (file == INVALID_HANDLE_VALUE)
 178     return FALSE;
 179
 180   file_mapping = CreateFileMapping (file, NULL, PAGE_READWRITE,
 181                                     0, size, NULL);
 182   if (!file_mapping)
 183     return FALSE;
 184
 185   file_base = MapViewOfFile (file_mapping, FILE_MAP_WRITE, 0, 0, size);
 186   if (file_base == 0)
 187     return FALSE;
 188
 189   p_file->name = filename;
 190   p_file->size = size;
 191   p_file->file = file;
 192   p_file->file_mapping = file_mapping;
 193   p_file->file_base = file_base;
 194
 195   return TRUE;
 196 }
 197
 198 /* Close the system structures associated with the given file.  */
 199 void
 200 close_file_data (file_data *p_file)
 201 {
 202   UnmapViewOfFile (p_file->file_base);
 203   CloseHandle (p_file->file_mapping);
 204   /* For the case of output files, set final size.  */
 205   SetFilePointer (p_file->file, p_file->size, NULL, FILE_BEGIN);
 206   SetEndOfFile (p_file->file);
 207   CloseHandle (p_file->file);
 208 }
 209
 210
 211 /* Routines to manipulate NT executable file sections.  */
 212
 213 /* Return pointer to section header for named section. */
 214 IMAGE_SECTION_HEADER *
 215 find_section (char * name, IMAGE_NT_HEADERS * nt_header)
 216 {
 217   PIMAGE_SECTION_HEADER section;
 218   int i;
 219
 220   section = IMAGE_FIRST_SECTION (nt_header);
 221
 222   for (i = 0; i < nt_header->FileHeader.NumberOfSections; i++)
 223     {
 224       if (strcmp (section->Name, name) == 0)
 225         return section;
 226       section++;
 227     }
 228   return NULL;
 229 }
 230
 231 /* Return pointer to section header for section containing the given
 232    relative virtual address. */
 233 IMAGE_SECTION_HEADER *
 234 rva_to_section (DWORD rva, IMAGE_NT_HEADERS * nt_header)
 235 {
 236   PIMAGE_SECTION_HEADER section;
 237   int i;
 238
 239   section = IMAGE_FIRST_SECTION (nt_header);
 240
 241   for (i = 0; i < nt_header->FileHeader.NumberOfSections; i++)
 242     {
 243       /* Some linkers (eg. the NT SDK linker I believe) swapped the
 244          meaning of these two values - or rather, they ignored
 245          VirtualSize entirely and always set it to zero.  This affects
 246          some very old exes (eg. gzip dated Dec 1993).  Since
 247          w32_executable_type relies on this function to work reliably,
 248          we need to cope with this.  */
 249       DWORD real_size = max (section->SizeOfRawData,
 250                              section->Misc.VirtualSize);
 251       if (rva >= section->VirtualAddress
 252           && rva < section->VirtualAddress + real_size)
 253         return section;
 254       section++;
 255     }
 256   return NULL;
 257 }
 258
 259 /* Return pointer to section header for section containing the given
 260    offset in its raw data area. */
 261 IMAGE_SECTION_HEADER *
 262 offset_to_section (DWORD offset, IMAGE_NT_HEADERS * nt_header)
 263 {
 264   PIMAGE_SECTION_HEADER section;
 265   int i;
 266
 267   section = IMAGE_FIRST_SECTION (nt_header);
 268
 269   for (i = 0; i < nt_header->FileHeader.NumberOfSections; i++)
 270     {
 271       if (offset >= section->PointerToRawData
 272           && offset < section->PointerToRawData + section->SizeOfRawData)
 273         return section;
 274       section++;
 275     }
 276   return NULL;
 277 }
 278
 279 /* Return offset to an object in dst, given offset in src.  We assume
 280    there is at least one section in both src and dst images, and that
 281    the some sections may have been added to dst (after sections in src).  */
 282 DWORD
 283 relocate_offset (DWORD offset,
 284                  IMAGE_NT_HEADERS * src_nt_header,
 285                  IMAGE_NT_HEADERS * dst_nt_header)
 286 {
 287   PIMAGE_SECTION_HEADER src_section = IMAGE_FIRST_SECTION (src_nt_header);
 288   PIMAGE_SECTION_HEADER dst_section = IMAGE_FIRST_SECTION (dst_nt_header);
 289   int i = 0;
 290
 291   while (offset >= src_section->PointerToRawData)
 292     {
 293       if (offset < src_section->PointerToRawData + src_section->SizeOfRawData)
 294         break;
 295       i++;
 296       if (i == src_nt_header->FileHeader.NumberOfSections)
 297         {
 298           /* Handle offsets after the last section.  */
 299           dst_section = IMAGE_FIRST_SECTION (dst_nt_header);
 300           dst_section += dst_nt_header->FileHeader.NumberOfSections - 1;
 301           while (dst_section->PointerToRawData == 0)
 302             dst_section--;
 303           while (src_section->PointerToRawData == 0)
 304             src_section--;
 305           return offset
 306             + (dst_section->PointerToRawData + dst_section->SizeOfRawData)
 307             - (src_section->PointerToRawData + src_section->SizeOfRawData);
 308         }
 309       src_section++;
 310       dst_section++;
 311     }
 312   return offset +
 313     (dst_section->PointerToRawData - src_section->PointerToRawData);
 314 }
 315
 316 #define OFFSET_TO_RVA(offset, section) \
 317           (section->VirtualAddress + ((DWORD)(offset) - section->PointerToRawData))
 318
 319 #define RVA_TO_OFFSET(rva, section) \
 320           (section->PointerToRawData + ((DWORD)(rva) - section->VirtualAddress))
 321
 322 #define RVA_TO_SECTION_OFFSET(rva, section) \
 323           ((DWORD)(rva) - section->VirtualAddress)
 324
 325 /* Convert address in executing image to RVA.  */
 326 #define PTR_TO_RVA(ptr) ((DWORD)(ptr) - (DWORD) GetModuleHandle (NULL))
 327
 328 #define RVA_TO_PTR(var,section,filedata) \
 329           ((void *)(RVA_TO_OFFSET(var,section) + (filedata).file_base))
 330
 331 #define PTR_TO_OFFSET(ptr, pfile_data) \
 332           ((unsigned char *)(ptr) - (pfile_data)->file_base)
 333
 334 #define OFFSET_TO_PTR(offset, pfile_data) \
 335           ((pfile_data)->file_base + (DWORD)(offset))
 336
 337
 338 /* Flip through the executable and cache the info necessary for dumping.  */
 339 void
 340 get_section_info (file_data *p_infile)
 341 {
 342   PIMAGE_DOS_HEADER dos_header;
 343   PIMAGE_NT_HEADERS nt_header;
 344   PIMAGE_SECTION_HEADER section;
 345   int overlap;
 346
 347   dos_header = (PIMAGE_DOS_HEADER) p_infile->file_base;
 348   if (dos_header->e_magic != IMAGE_DOS_SIGNATURE)
 349     {
 350       printf ("Unknown EXE header in %s...bailing.\n", p_infile->name);
 351       exit (1);
 352     }
 353   nt_header = (PIMAGE_NT_HEADERS) (((unsigned long) dos_header) +
 354                                    dos_header->e_lfanew);
 355   if (nt_header == NULL)
 356     {
 357       printf ("Failed to find IMAGE_NT_HEADER in %s...bailing.\n",
 358              p_infile->name);
 359       exit (1);
 360     }
 361
 362   /* Check the NT header signature ...  */
 363   if (nt_header->Signature != IMAGE_NT_SIGNATURE)
 364     {
 365       printf ("Invalid IMAGE_NT_SIGNATURE 0x%x in %s...bailing.\n",
 366               nt_header->Signature, p_infile->name);
 367       exit (1);
 368     }
 369
 370   /* Locate the ".data" and ".bss" sections for Emacs.  (Note that the
 371      actual section names are probably different from these, and might
 372      actually be the same section.)
 373
 374      We do this as follows: first we determine the virtual address
 375      ranges in this process for the data and bss variables that we wish
 376      to preserve.  Then we map these VAs to the section entries in the
 377      source image.  Finally, we determine the new size of the raw data
 378      area for the bss section, so we can make the new image the correct
 379      size.  */
 380
 381   /* We arrange for the Emacs initialized data to be in a separate
 382      section if possible, because we cannot rely on my_begdata and
 383      my_edata marking out the full extent of the initialized data, at
 384      least on the Alpha where the linker freely reorders variables
 385      across libraries.  If we can arrange for this, all we need to do is
 386      find the start and size of the EMDATA section.  */
 387   data_section = find_section ("EMDATA", nt_header);
 388   if (data_section)
 389     {
 390       data_start = (char *) nt_header->OptionalHeader.ImageBase +
 391         data_section->VirtualAddress;
 392       data_size = data_section->Misc.VirtualSize;
 393     }
 394   else
 395     {
 396       /* Fallback on the old method if compiler doesn't support the
 397          data_set #pragma (or its equivalent).  */
 398       data_start = my_begdata;
 399       data_size = my_edata - my_begdata;
 400       data_section = rva_to_section (PTR_TO_RVA (my_begdata), nt_header);
 401       if (data_section != rva_to_section (PTR_TO_RVA (my_edata), nt_header))
 402         {
 403           printf ("Initialized data is not in a single section...bailing\n");
 404           exit (1);
 405         }
 406     }
 407
 408   /* As noted in lastfile.c, the Alpha (but not the Intel) MSVC linker
 409      globally segregates all static and public bss data (ie. across all
 410      linked modules, not just per module), so we must take both static
 411      and public bss areas into account to determine the true extent of
 412      the bss area used by Emacs.
 413
 414      To be strictly correct, we dump the static and public bss areas
 415      used by Emacs separately if non-overlapping (since otherwise we are
 416      dumping bss data belonging to system libraries, eg. the static bss
 417      system data on the Alpha).  */
 418
 419   bss_start = my_begbss;
 420   bss_size = my_endbss - my_begbss;
 421   bss_section = rva_to_section (PTR_TO_RVA (my_begbss), nt_header);
 422   if (bss_section != rva_to_section (PTR_TO_RVA (my_endbss), nt_header))
 423     {
 424       printf ("Uninitialized data is not in a single section...bailing\n");
 425       exit (1);
 426     }
 427   /* Compute how much the .bss section's raw data will grow.  */
 428   extra_bss_size =
 429     ROUND_UP (RVA_TO_SECTION_OFFSET (PTR_TO_RVA (my_endbss), bss_section),
 430               nt_header->OptionalHeader.FileAlignment)
 431     - bss_section->SizeOfRawData;
 432
 433   bss_start_static = my_begbss_static;
 434   bss_size_static = my_endbss_static - my_begbss_static;
 435   bss_section_static = rva_to_section (PTR_TO_RVA (my_begbss_static), nt_header);
 436   if (bss_section_static != rva_to_section (PTR_TO_RVA (my_endbss_static), nt_header))
 437     {
 438       printf ("Uninitialized static data is not in a single section...bailing\n");
 439       exit (1);
 440     }
 441   /* Compute how much the static .bss section's raw data will grow.  */
 442   extra_bss_size_static =
 443     ROUND_UP (RVA_TO_SECTION_OFFSET (PTR_TO_RVA (my_endbss_static), bss_section_static),
 444               nt_header->OptionalHeader.FileAlignment)
 445     - bss_section_static->SizeOfRawData;
 446
 447   /* Combine the bss sections into one if they overlap.  */
 448 #ifdef _ALPHA_
 449   overlap = 1;                  /* force all bss data to be dumped */
 450 #else
 451   overlap = 0;
 452 #endif
 453   if (bss_start < bss_start_static)
 454     {
 455       if (bss_start_static < bss_start + bss_size)
 456         overlap = 1;
 457     }
 458   else
 459     {
 460       if (bss_start < bss_start_static + bss_size_static)
 461         overlap = 1;
 462     }
 463   if (overlap)
 464     {
 465       if (bss_section != bss_section_static)
 466         {
 467           printf ("BSS data not in a single section...bailing\n");
 468           exit (1);
 469         }
 470       bss_start = min (bss_start, bss_start_static);
 471       bss_size = max (my_endbss, my_endbss_static) - bss_start;
 472       bss_section_static = 0;
 473       extra_bss_size_static = 0;
 474     }
 475
 476   heap_section = rva_to_section (PTR_TO_RVA (get_heap_start ()), nt_header);
 477 }
 478
 479
 480 /* The dump routines.  */
 481
 482 void
 483 copy_executable_and_dump_data (file_data *p_infile,
 484                                file_data *p_outfile)
 485 {
 486   unsigned char *dst, *dst_save;
 487   PIMAGE_DOS_HEADER dos_header;
 488   PIMAGE_NT_HEADERS nt_header;
 489   PIMAGE_NT_HEADERS dst_nt_header;
 490   PIMAGE_SECTION_HEADER section;
 491   PIMAGE_SECTION_HEADER dst_section;
 492   DWORD offset;
 493   int i;
 494   int be_verbose = GetEnvironmentVariable ("DEBUG_DUMP", NULL, 0) > 0;
 495
 496 #define COPY_CHUNK(message, src, size, verbose)                                 \
 497   do {                                                                          \
 498     unsigned char *s = (void *)(src);                                           \
 499     unsigned long count = (size);                                               \
 500     if (verbose)                                                                \
 501       {                                                                         \
 502         printf ("%s\n", (message));                                             \
 503         printf ("\t0x%08x Offset in input file.\n", s - p_infile->file_base);   \
 504         printf ("\t0x%08x Offset in output file.\n", dst - p_outfile->file_base); \
 505         printf ("\t0x%08x Size in bytes.\n", count);                            \
 506       }                                                                         \
 507     memcpy (dst, s, count);                                                     \
 508     dst += count;                                                               \
 509   } while (0)
 510
 511 #define COPY_PROC_CHUNK(message, src, size, verbose)                            \
 512   do {                                                                          \
 513     unsigned char *s = (void *)(src);                                           \
 514     unsigned long count = (size);                                               \
 515     if (verbose)                                                                \
 516       {                                                                         \
 517         printf ("%s\n", (message));                                             \
 518         printf ("\t0x%08x Address in process.\n", s);                           \
 519         printf ("\t0x%08x Offset in output file.\n", dst - p_outfile->file_base); \
 520         printf ("\t0x%08x Size in bytes.\n", count);                            \
 521       }                                                                         \
 522     memcpy (dst, s, count);                                                     \
 523     dst += count;                                                               \
 524   } while (0)
 525
 526 #define DST_TO_OFFSET()  PTR_TO_OFFSET (dst, p_outfile)
 527 #define ROUND_UP_DST(align) \
 528   (dst = p_outfile->file_base + ROUND_UP (DST_TO_OFFSET (), (align)))
 529 #define ROUND_UP_DST_AND_ZERO(align)                                            \
 530   do {                                                                          \
 531     unsigned char *newdst = p_outfile->file_base                                \
 532       + ROUND_UP (DST_TO_OFFSET (), (align));                                   \
 533     /* Zero the alignment slop; it may actually initialize real data.  */       \
 534     memset (dst, 0, newdst - dst);                                              \
 535     dst = newdst;                                                               \
 536   } while (0)
 537
 538   /* Copy the source image sequentially, ie. section by section after
 539      copying the headers and section table, to simplify the process of
 540      dumping the raw data for the bss and heap sections.
 541
 542      Note that dst is updated implicitly by each COPY_CHUNK.  */
 543
 544   dos_header = (PIMAGE_DOS_HEADER) p_infile->file_base;
 545   nt_header = (PIMAGE_NT_HEADERS) (((unsigned long) dos_header) +
 546                                    dos_header->e_lfanew);
 547   section = IMAGE_FIRST_SECTION (nt_header);
 548
 549   dst = (unsigned char *) p_outfile->file_base;
 550
 551   COPY_CHUNK ("Copying DOS header...", dos_header,
 552               (DWORD) nt_header - (DWORD) dos_header, be_verbose);
 553   dst_nt_header = (PIMAGE_NT_HEADERS) dst;
 554   COPY_CHUNK ("Copying NT header...", nt_header,
 555               (DWORD) section - (DWORD) nt_header, be_verbose);
 556   dst_section = (PIMAGE_SECTION_HEADER) dst;
 557   COPY_CHUNK ("Copying section table...", section,
 558               nt_header->FileHeader.NumberOfSections * sizeof (*section),
 559               be_verbose);
 560
 561   /* Align the first section's raw data area, and set the header size
 562      field accordingly.  */
 563   ROUND_UP_DST_AND_ZERO (dst_nt_header->OptionalHeader.FileAlignment);
 564   dst_nt_header->OptionalHeader.SizeOfHeaders = DST_TO_OFFSET ();
 565
 566   for (i = 0; i < nt_header->FileHeader.NumberOfSections; i++)
 567     {
 568       char msg[100];
 569       /* Windows section names are fixed 8-char strings, only
 570          zero-terminated if the name is shorter than 8 characters.  */
 571       sprintf (msg, "Copying raw data for %.8s...", section->Name);
 572
 573       dst_save = dst;
 574
 575       /* Update the file-relative offset for this section's raw data (if
 576          it has any) in case things have been relocated; we will update
 577          the other offsets below once we know where everything is.  */
 578       if (dst_section->PointerToRawData)
 579         dst_section->PointerToRawData = DST_TO_OFFSET ();
 580
 581       /* Can always copy the original raw data.  */
 582       COPY_CHUNK
 583         (msg, OFFSET_TO_PTR (section->PointerToRawData, p_infile),
 584          section->SizeOfRawData, be_verbose);
 585       /* Ensure alignment slop is zeroed.  */
 586       ROUND_UP_DST_AND_ZERO (dst_nt_header->OptionalHeader.FileAlignment);
 587
 588       /* Note that various sections below may be aliases.  */
 589       if (section == data_section)
 590         {
 591           dst = dst_save
 592             + RVA_TO_SECTION_OFFSET (PTR_TO_RVA (data_start), dst_section);
 593           COPY_PROC_CHUNK ("Dumping initialized data...",
 594                            data_start, data_size, be_verbose);
 595           dst = dst_save + dst_section->SizeOfRawData;
 596         }
 597       if (section == bss_section)
 598         {
 599           /* Dump contents of bss variables, adjusting the section's raw
 600              data size as necessary.  */
 601           dst = dst_save
 602             + RVA_TO_SECTION_OFFSET (PTR_TO_RVA (bss_start), dst_section);
 603           COPY_PROC_CHUNK ("Dumping bss data...", bss_start,
 604                            bss_size, be_verbose);
 605           ROUND_UP_DST (dst_nt_header->OptionalHeader.FileAlignment);
 606           dst_section->PointerToRawData = PTR_TO_OFFSET (dst_save, p_outfile);
 607           /* Determine new size of raw data area.  */
 608           dst = max (dst, dst_save + dst_section->SizeOfRawData);
 609           dst_section->SizeOfRawData = dst - dst_save;
 610           dst_section->Characteristics &= ~IMAGE_SCN_CNT_UNINITIALIZED_DATA;
 611           dst_section->Characteristics |= IMAGE_SCN_CNT_INITIALIZED_DATA;
 612         }
 613       if (section == bss_section_static)
 614         {
 615           /* Dump contents of static bss variables, adjusting the
 616              section's raw data size as necessary.  */
 617           dst = dst_save
 618             + RVA_TO_SECTION_OFFSET (PTR_TO_RVA (bss_start_static), dst_section);
 619           COPY_PROC_CHUNK ("Dumping static bss data...", bss_start_static,
 620                            bss_size_static, be_verbose);
 621           ROUND_UP_DST (dst_nt_header->OptionalHeader.FileAlignment);
 622           dst_section->PointerToRawData = PTR_TO_OFFSET (dst_save, p_outfile);
 623           /* Determine new size of raw data area.  */
 624           dst = max (dst, dst_save + dst_section->SizeOfRawData);
 625           dst_section->SizeOfRawData = dst - dst_save;
 626           dst_section->Characteristics &= ~IMAGE_SCN_CNT_UNINITIALIZED_DATA;
 627           dst_section->Characteristics |= IMAGE_SCN_CNT_INITIALIZED_DATA;
 628         }
 629       if (section == heap_section)
 630         {
 631           DWORD heap_start = (DWORD) get_heap_start ();
 632           DWORD heap_size = get_committed_heap_size ();
 633
 634           /* Dump the used portion of the predump heap, adjusting the
 635              section's size to the appropriate size.  */
 636           dst = dst_save
 637             + RVA_TO_SECTION_OFFSET (PTR_TO_RVA (heap_start), dst_section);
 638           COPY_PROC_CHUNK ("Dumping heap...", heap_start, heap_size,
 639                            be_verbose);
 640           ROUND_UP_DST (dst_nt_header->OptionalHeader.FileAlignment);
 641           dst_section->PointerToRawData = PTR_TO_OFFSET (dst_save, p_outfile);
 642           /* Determine new size of raw data area.  */
 643           dst = max (dst, dst_save + dst_section->SizeOfRawData);
 644           dst_section->SizeOfRawData = dst - dst_save;
 645           /* Reduce the size of the heap section to fit (must be last
 646              section).  */
 647           dst_nt_header->OptionalHeader.SizeOfImage -=
 648             dst_section->Misc.VirtualSize
 649             - ROUND_UP (dst_section->SizeOfRawData,
 650                         dst_nt_header->OptionalHeader.SectionAlignment);
 651           dst_section->Misc.VirtualSize =
 652             ROUND_UP (dst_section->SizeOfRawData,
 653                       dst_nt_header->OptionalHeader.SectionAlignment);
 654           dst_section->Characteristics &= ~IMAGE_SCN_CNT_UNINITIALIZED_DATA;
 655           dst_section->Characteristics |= IMAGE_SCN_CNT_INITIALIZED_DATA;
 656         }
 657
 658       /* Align the section's raw data area.  */
 659       ROUND_UP_DST (dst_nt_header->OptionalHeader.FileAlignment);
 660
 661       section++;
 662       dst_section++;
 663     }
 664
 665   /* Copy remainder of source image.  */
 666   do
 667     section--;
 668   while (section->PointerToRawData == 0);
 669   offset = ROUND_UP (section->PointerToRawData + section->SizeOfRawData,
 670                      nt_header->OptionalHeader.FileAlignment);
 671   COPY_CHUNK
 672     ("Copying remainder of executable...",
 673      OFFSET_TO_PTR (offset, p_infile),
 674      p_infile->size - offset, be_verbose);
 675
 676   /* Final size for new image.  */
 677   p_outfile->size = DST_TO_OFFSET ();
 678
 679   /* Now patch up remaining file-relative offsets.  */
 680   section = IMAGE_FIRST_SECTION (nt_header);
 681   dst_section = IMAGE_FIRST_SECTION (dst_nt_header);
 682
 683 #define ADJUST_OFFSET(var)                                              \
 684   do {                                                                  \
 685     if ((var) != 0)                                                     \
 686       (var) = relocate_offset ((var), nt_header, dst_nt_header);        \
 687   } while (0)
 688
 689   dst_nt_header->OptionalHeader.SizeOfInitializedData = 0;
 690   dst_nt_header->OptionalHeader.SizeOfUninitializedData = 0;
 691   for (i = 0; i < dst_nt_header->FileHeader.NumberOfSections; i++)
 692     {
 693       /* Recompute data sizes for completeness.  */
 694       if (dst_section[i].Characteristics & IMAGE_SCN_CNT_INITIALIZED_DATA)
 695         dst_nt_header->OptionalHeader.SizeOfInitializedData +=
 696           ROUND_UP (dst_section[i].Misc.VirtualSize, dst_nt_header->OptionalHeader.FileAlignment);
 697       else if (dst_section[i].Characteristics & IMAGE_SCN_CNT_UNINITIALIZED_DATA)
 698         dst_nt_header->OptionalHeader.SizeOfUninitializedData +=
 699           ROUND_UP (dst_section[i].Misc.VirtualSize, dst_nt_header->OptionalHeader.FileAlignment);
 700
 701       ADJUST_OFFSET (dst_section[i].PointerToLinenumbers);
 702     }
 703
 704   ADJUST_OFFSET (dst_nt_header->FileHeader.PointerToSymbolTable);
 705
 706   /* Update offsets in debug directory entries. */
 707   {
 708     IMAGE_DATA_DIRECTORY debug_dir =
 709       dst_nt_header->OptionalHeader.DataDirectory[IMAGE_DIRECTORY_ENTRY_DEBUG];
 710     PIMAGE_DEBUG_DIRECTORY debug_entry;
 711
 712     section = rva_to_section (debug_dir.VirtualAddress, dst_nt_header);
 713     if (section)
 714       {
 715         debug_entry = (PIMAGE_DEBUG_DIRECTORY)
 716           (RVA_TO_OFFSET (debug_dir.VirtualAddress, section) + p_outfile->file_base);
 717         debug_dir.Size /= sizeof (IMAGE_DEBUG_DIRECTORY);
 718
 719         for (i = 0; i < debug_dir.Size; i++, debug_entry++)
 720           ADJUST_OFFSET (debug_entry->PointerToRawData);
 721       }
 722   }
 723 }
 724
 725
 726 /* Dump out .data and .bss sections into a new executable.  */
 727 void
 728 unexec (char *new_name, char *old_name, void *start_data, void *start_bss,
 729         void *entry_address)
 730 {
 731   file_data in_file, out_file;
 732   char out_filename[MAX_PATH], in_filename[MAX_PATH];
 733   unsigned long size;
 734   char *p;
 735   char *q;
 736
 737   /* Ignore old_name, and get our actual location from the OS.  */
 738   if (!GetModuleFileName (NULL, in_filename, MAX_PATH))
 739     abort ();
 740   dostounix_filename (in_filename);
 741   strcpy (out_filename, in_filename);
 742
 743   /* Change the base of the output filename to match the requested name.  */
 744   if ((p = strrchr (out_filename, '/')) == NULL)
 745     abort ();
 746   /* The filenames have already been expanded, and will be in Unix
 747      format, so it is safe to expect an absolute name.  */
 748   if ((q = strrchr (new_name, '/')) == NULL)
 749     abort ();
 750   strcpy (p, q);
 751
 752   /* Make sure that the output filename has the ".exe" extension...patch
 753      it up if not.  */
 754   p = out_filename + strlen (out_filename) - 4;
 755   if (strcmp (p, ".exe"))
 756     strcat (out_filename, ".exe");
 757
 758   printf ("Dumping from %s\n", in_filename);
 759   printf ("          to %s\n", out_filename);
 760
 761   /* We need to round off our heap to NT's page size.  */
 762   round_heap (get_page_size ());
 763
 764   /* Open the undumped executable file.  */
 765   if (!open_input_file (&in_file, in_filename))
 766     {
 767       printf ("Failed to open %s (%d)...bailing.\n",
 768               in_filename, GetLastError ());
 769       exit (1);
 770     }
 771
 772   /* Get the interesting section info, like start and size of .bss...  */
 773   get_section_info (&in_file);
 774
 775   /* The size of the dumped executable is the size of the original
 776      executable plus the size of the heap and the size of the .bss section.  */
 777   size = in_file.size +
 778     get_committed_heap_size () +
 779     extra_bss_size +
 780     extra_bss_size_static;
 781   if (!open_output_file (&out_file, out_filename, size))
 782     {
 783       printf ("Failed to open %s (%d)...bailing.\n",
 784               out_filename, GetLastError ());
 785       exit (1);
 786     }
 787
 788   /* Set the flag (before dumping).  */
 789   using_dynamic_heap = TRUE;
 790
 791   copy_executable_and_dump_data (&in_file, &out_file);
 792
 793   /* Patch up header fields; profiler is picky about this. */
 794   {
 795     PIMAGE_DOS_HEADER dos_header;
 796     PIMAGE_NT_HEADERS nt_header;
 797     HANDLE hImagehelp = LoadLibrary ("imagehlp.dll");
 798     DWORD  headersum;
 799     DWORD  checksum;
 800
 801     dos_header = (PIMAGE_DOS_HEADER) out_file.file_base;
 802     nt_header = (PIMAGE_NT_HEADERS) ((char *) dos_header + dos_header->e_lfanew);
 803
 804     nt_header->OptionalHeader.CheckSum = 0;
 805 //    nt_header->FileHeader.TimeDateStamp = time (NULL);
 806 //    dos_header->e_cp = size / 512;
 807 //    nt_header->OptionalHeader.SizeOfImage = size;
 808
 809     pfnCheckSumMappedFile = (void *) GetProcAddress (hImagehelp, "CheckSumMappedFile");
 810     if (pfnCheckSumMappedFile)
 811       {
 812 //      nt_header->FileHeader.TimeDateStamp = time (NULL);
 813         pfnCheckSumMappedFile (out_file.file_base,
 814                                out_file.size,
 815                                &headersum,
 816                                &checksum);
 817         nt_header->OptionalHeader.CheckSum = checksum;
 818       }
 819     FreeLibrary (hImagehelp);
 820   }
 821
 822   close_file_data (&in_file);
 823   close_file_data (&out_file);
 824 }
 825
 826 /* eof */
 827
 828 /* arch-tag: fe1d3d1c-ef88-4917-ab22-f12ab16b3254
 829    (do not change this comment) */