nt/addsection.c

   1 /* Add an uninitialized data section to an executable.
   2    Copyright (C) 1999, 2001-2015 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 3 of the License, or
   9 (at your option) 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.  If not, see <http://www.gnu.org/licenses/>.
  18
  19
  20    Andrew Innes <andrewi@harlequin.co.uk>       04-Jan-1999
  21      based on code from unexw32.c
  22 */
  23
  24 #include <stdlib.h>
  25 #include <stdio.h>
  26 #include <fcntl.h>
  27 #include <time.h>
  28 #if defined(__GNUC__) && !defined(MINGW_W64)
  29 #define _ANONYMOUS_UNION
  30 #define _ANONYMOUS_STRUCT
  31 #endif
  32 #include <windows.h>
  33
  34 /* Include relevant definitions from IMAGEHLP.H, which can be found
  35    in \\win32sdk\mstools\samples\image\include\imagehlp.h. */
  36
  37 PIMAGE_NT_HEADERS
  38 (__stdcall * pfnCheckSumMappedFile) (PVOID BaseAddress,
  39                                      DWORD_PTR FileLength,
  40                                      PDWORD_PTR HeaderSum,
  41                                      PDWORD_PTR CheckSum);
  42
  43 #undef min
  44 #undef max
  45 #define min(x, y) (((x) < (y)) ? (x) : (y))
  46 #define max(x, y) (((x) > (y)) ? (x) : (y))
  47
  48
  49 /* File handling.  */
  50
  51 typedef struct file_data {
  52   const char    *name;
  53   unsigned long  size;
  54   HANDLE         file;
  55   HANDLE         file_mapping;
  56   unsigned char *file_base;
  57 } file_data;
  58
  59 int
  60 open_input_file (file_data *p_file, const char *filename)
  61 {
  62   HANDLE file;
  63   HANDLE file_mapping;
  64   void  *file_base;
  65   unsigned long size, upper_size;
  66
  67   file = CreateFile (filename, GENERIC_READ, FILE_SHARE_READ, NULL,
  68                      OPEN_EXISTING, FILE_ATTRIBUTE_NORMAL, 0);
  69   if (file == INVALID_HANDLE_VALUE)
  70     return FALSE;
  71
  72   size = GetFileSize (file, &upper_size);
  73   file_mapping = CreateFileMapping (file, NULL, PAGE_READONLY,
  74                                     0, size, NULL);
  75   if (!file_mapping)
  76     return FALSE;
  77
  78   file_base = MapViewOfFile (file_mapping, FILE_MAP_READ, 0, 0, size);
  79   if (file_base == 0)
  80     return FALSE;
  81
  82   p_file->name = filename;
  83   p_file->size = size;
  84   p_file->file = file;
  85   p_file->file_mapping = file_mapping;
  86   p_file->file_base = file_base;
  87
  88   return TRUE;
  89 }
  90
  91 int
  92 open_output_file (file_data *p_file, const char *filename, unsigned long size)
  93 {
  94   HANDLE file;
  95   HANDLE file_mapping;
  96   void  *file_base;
  97
  98   file = CreateFile (filename, GENERIC_READ | GENERIC_WRITE, 0, NULL,
  99                      CREATE_ALWAYS, FILE_ATTRIBUTE_NORMAL, 0);
 100   if (file == INVALID_HANDLE_VALUE)
 101     return FALSE;
 102
 103   file_mapping = CreateFileMapping (file, NULL, PAGE_READWRITE,
 104                                     0, size, NULL);
 105   if (!file_mapping)
 106     return FALSE;
 107
 108   file_base = MapViewOfFile (file_mapping, FILE_MAP_WRITE, 0, 0, size);
 109   if (file_base == 0)
 110     return FALSE;
 111
 112   p_file->name = filename;
 113   p_file->size = size;
 114   p_file->file = file;
 115   p_file->file_mapping = file_mapping;
 116   p_file->file_base = file_base;
 117
 118   return TRUE;
 119 }
 120
 121 /* Close the system structures associated with the given file.  */
 122 void
 123 close_file_data (file_data *p_file)
 124 {
 125   UnmapViewOfFile (p_file->file_base);
 126   CloseHandle (p_file->file_mapping);
 127   /* For the case of output files, set final size.  */
 128   SetFilePointer (p_file->file, p_file->size, NULL, FILE_BEGIN);
 129   SetEndOfFile (p_file->file);
 130   CloseHandle (p_file->file);
 131 }
 132
 133
 134 /* Routines to manipulate NT executable file sections.  */
 135
 136 unsigned long
 137 get_unrounded_section_size (PIMAGE_SECTION_HEADER p_section)
 138 {
 139   /* The true section size, before rounding, for an initialized data or
 140      code section.  (Supposedly some linkers swap the meaning of these
 141      two values.)  */
 142   return min (p_section->SizeOfRawData,
 143               p_section->Misc.VirtualSize);
 144 }
 145
 146 /* Return pointer to section header for named section. */
 147 IMAGE_SECTION_HEADER *
 148 find_section (const char *name, IMAGE_NT_HEADERS *nt_header)
 149 {
 150   PIMAGE_SECTION_HEADER section;
 151   int i;
 152
 153   section = IMAGE_FIRST_SECTION (nt_header);
 154
 155   for (i = 0; i < nt_header->FileHeader.NumberOfSections; i++)
 156     {
 157       if (strcmp (section->Name, name) == 0)
 158         return section;
 159       section++;
 160     }
 161   return NULL;
 162 }
 163
 164 /* Return pointer to section header for section containing the given
 165    relative virtual address. */
 166 IMAGE_SECTION_HEADER *
 167 rva_to_section (DWORD_PTR rva, IMAGE_NT_HEADERS * nt_header)
 168 {
 169   PIMAGE_SECTION_HEADER section;
 170   int i;
 171
 172   section = IMAGE_FIRST_SECTION (nt_header);
 173
 174   for (i = 0; i < nt_header->FileHeader.NumberOfSections; i++)
 175     {
 176       /* Some linkers (eg. the NT SDK linker I believe) swapped the
 177          meaning of these two values - or rather, they ignored
 178          VirtualSize entirely and always set it to zero.  This affects
 179          some very old exes (eg. gzip dated Dec 1993).  Since
 180          w32_executable_type relies on this function to work reliably,
 181          we need to cope with this.  */
 182       DWORD_PTR real_size = max (section->SizeOfRawData,
 183                              section->Misc.VirtualSize);
 184       if (rva >= section->VirtualAddress
 185           && rva < section->VirtualAddress + real_size)
 186         return section;
 187       section++;
 188     }
 189   return NULL;
 190 }
 191
 192 /* Return pointer to section header for section containing the given
 193    offset in its raw data area. */
 194 IMAGE_SECTION_HEADER *
 195 offset_to_section (DWORD_PTR offset, IMAGE_NT_HEADERS * nt_header)
 196 {
 197   PIMAGE_SECTION_HEADER section;
 198   int i;
 199
 200   section = IMAGE_FIRST_SECTION (nt_header);
 201
 202   for (i = 0; i < nt_header->FileHeader.NumberOfSections; i++)
 203     {
 204       if (offset >= section->PointerToRawData
 205           && offset < section->PointerToRawData + section->SizeOfRawData)
 206         return section;
 207       section++;
 208     }
 209   return NULL;
 210 }
 211
 212 /* Return offset to an object in dst, given offset in src.  We assume
 213    there is at least one section in both src and dst images, and that
 214    the some sections may have been added to dst (after sections in src).  */
 215 static DWORD_PTR
 216 relocate_offset (DWORD_PTR offset,
 217                  IMAGE_NT_HEADERS * src_nt_header,
 218                  IMAGE_NT_HEADERS * dst_nt_header)
 219 {
 220   PIMAGE_SECTION_HEADER src_section = IMAGE_FIRST_SECTION (src_nt_header);
 221   PIMAGE_SECTION_HEADER dst_section = IMAGE_FIRST_SECTION (dst_nt_header);
 222   int i = 0;
 223
 224   while (offset >= src_section->PointerToRawData)
 225     {
 226       if (offset < src_section->PointerToRawData + src_section->SizeOfRawData)
 227         break;
 228       i++;
 229       if (i == src_nt_header->FileHeader.NumberOfSections)
 230         {
 231           /* Handle offsets after the last section.  */
 232           dst_section = IMAGE_FIRST_SECTION (dst_nt_header);
 233           dst_section += dst_nt_header->FileHeader.NumberOfSections - 1;
 234           while (dst_section->PointerToRawData == 0)
 235             dst_section--;
 236           while (src_section->PointerToRawData == 0)
 237             src_section--;
 238           return offset
 239             + (dst_section->PointerToRawData + dst_section->SizeOfRawData)
 240             - (src_section->PointerToRawData + src_section->SizeOfRawData);
 241         }
 242       src_section++;
 243       dst_section++;
 244     }
 245   return offset +
 246     (dst_section->PointerToRawData - src_section->PointerToRawData);
 247 }
 248
 249 #define OFFSET_TO_RVA(offset, section) \
 250           (section->VirtualAddress + ((DWORD_PTR)(offset) - section->PointerToRawData))
 251
 252 #define RVA_TO_OFFSET(rva, section) \
 253           (section->PointerToRawData + ((DWORD_PTR)(rva) - section->VirtualAddress))
 254
 255 #define RVA_TO_SECTION_OFFSET(rva, section) \
 256           ((DWORD_PTR)(rva) - section->VirtualAddress)
 257
 258 /* Convert address in executing image to RVA.  */
 259 #define PTR_TO_RVA(ptr) ((DWORD_PTR)(ptr) - (DWORD_PTR) GetModuleHandle (NULL))
 260
 261 #define PTR_TO_OFFSET(ptr, pfile_data) \
 262           ((unsigned const char *)(ptr) - (pfile_data)->file_base)
 263
 264 #define OFFSET_TO_PTR(offset, pfile_data) \
 265           ((pfile_data)->file_base + (DWORD_PTR)(offset))
 266
 267 #define ROUND_UP(p, align) \
 268           (((DWORD_PTR)(p) + (align)-1) & ~((DWORD_PTR)(align)-1))
 269 #define ROUND_DOWN(p, align) ((DWORD_PTR)(p) & ~((DWORD_PTR)(align)-1))
 270
 271
 272 static void
 273 copy_executable_and_add_section (file_data *p_infile,
 274                                  file_data *p_outfile,
 275                                  const char *new_section_name,
 276                                  DWORD_PTR new_section_size)
 277 {
 278   unsigned char *dst;
 279   PIMAGE_DOS_HEADER dos_header;
 280   PIMAGE_NT_HEADERS nt_header;
 281   PIMAGE_NT_HEADERS dst_nt_header;
 282   PIMAGE_SECTION_HEADER section;
 283   PIMAGE_SECTION_HEADER dst_section;
 284   DWORD_PTR offset;
 285   int i;
 286   int be_verbose = GetEnvironmentVariable ("DEBUG_DUMP", NULL, 0) > 0;
 287
 288 #define COPY_CHUNK(message, src, size, verbose)                                 \
 289   do {                                                                          \
 290     unsigned const char *s = (void *)(src);                                             \
 291     unsigned long count = (size);                                               \
 292     if (verbose)                                                                \
 293       {                                                                         \
 294         printf ("%s\n", (message));                                             \
 295         printf ("\t0x%08x Offset in input file.\n", s - p_infile->file_base);   \
 296         printf ("\t0x%08x Offset in output file.\n", dst - p_outfile->file_base); \
 297         printf ("\t0x%08x Size in bytes.\n", count);                            \
 298       }                                                                         \
 299     memcpy (dst, s, count);                                                     \
 300     dst += count;                                                               \
 301   } while (0)
 302
 303 #define DST_TO_OFFSET()  PTR_TO_OFFSET (dst, p_outfile)
 304 #define ROUND_UP_DST_AND_ZERO(align)                                            \
 305   do {                                                                          \
 306     unsigned char *newdst = p_outfile->file_base                                \
 307       + ROUND_UP (DST_TO_OFFSET (), (align));                                   \
 308     /* Zero the alignment slop; it may actually initialize real data.  */       \
 309     memset (dst, 0, newdst - dst);                                              \
 310     dst = newdst;                                                               \
 311   } while (0)
 312
 313   /* Copy the source image sequentially, ie. section by section after
 314      copying the headers and section table, to simplify the process of
 315      adding an extra section table entry (which might force the raw
 316      section data to be relocated).
 317
 318      Note that dst is updated implicitly by each COPY_CHUNK.  */
 319
 320   dos_header = (PIMAGE_DOS_HEADER) p_infile->file_base;
 321   nt_header = (PIMAGE_NT_HEADERS) (((unsigned char *) dos_header) +
 322                                    dos_header->e_lfanew);
 323   section = IMAGE_FIRST_SECTION (nt_header);
 324
 325   dst = (unsigned char *) p_outfile->file_base;
 326
 327   COPY_CHUNK ("Copying DOS header...", dos_header,
 328               (DWORD_PTR) nt_header - (DWORD_PTR) dos_header, be_verbose);
 329   dst_nt_header = (PIMAGE_NT_HEADERS) dst;
 330   COPY_CHUNK ("Copying NT header...", nt_header,
 331               (DWORD_PTR) section - (DWORD_PTR) nt_header, be_verbose);
 332   dst_section = (PIMAGE_SECTION_HEADER) dst;
 333   COPY_CHUNK ("Copying section table...", section,
 334               nt_header->FileHeader.NumberOfSections * sizeof (*section),
 335               be_verbose);
 336
 337   /* To improve the efficiency of demand loading, make the file
 338      alignment match the section alignment (VC++ 6.0 does this by
 339      default anyway).  */
 340   dst_nt_header->OptionalHeader.FileAlignment =
 341     dst_nt_header->OptionalHeader.SectionAlignment;
 342
 343   /* Add an uninitialized data section at the end, of the specified name
 344      and virtual size.  */
 345   if (find_section (new_section_name, nt_header) == NULL)
 346     /* Leave room for extra section table entry; filled in below.  */
 347     dst += sizeof (*section);
 348   else
 349     new_section_name = NULL;
 350
 351   /* Align the first section's raw data area, and set the header size
 352      field accordingly.  */
 353   ROUND_UP_DST_AND_ZERO (dst_nt_header->OptionalHeader.FileAlignment);
 354   dst_nt_header->OptionalHeader.SizeOfHeaders = DST_TO_OFFSET ();
 355
 356   for (i = 0; i < nt_header->FileHeader.NumberOfSections; i++)
 357     {
 358       char msg[100];
 359       /* Windows section names are fixed 8-char strings, only
 360          zero-terminated if the name is shorter than 8 characters.  */
 361       sprintf (msg, "Copying raw data for %.8s...", section->Name);
 362
 363       /* Update the file-relative offset for this section's raw data (if
 364          it has any) in case things have been relocated; we will update
 365          the other offsets below once we know where everything is.  */
 366       if (dst_section->PointerToRawData)
 367         dst_section->PointerToRawData = DST_TO_OFFSET ();
 368
 369       /* Can always copy the original raw data.  */
 370       COPY_CHUNK
 371         (msg, OFFSET_TO_PTR (section->PointerToRawData, p_infile),
 372          section->SizeOfRawData, be_verbose);
 373
 374       /* Round up the raw data size to the new alignment.  */
 375       dst_section->SizeOfRawData =
 376         ROUND_UP (dst_section->SizeOfRawData,
 377                   dst_nt_header->OptionalHeader.FileAlignment);
 378
 379       /* Align the next section's raw data area.  */
 380       ROUND_UP_DST_AND_ZERO (dst_nt_header->OptionalHeader.FileAlignment);
 381
 382       section++;
 383       dst_section++;
 384     }
 385
 386   /* Add the extra section entry (which adds no raw data).  */
 387   if (new_section_name != NULL)
 388     {
 389       dst_nt_header->FileHeader.NumberOfSections++;
 390       dst_nt_header->OptionalHeader.SizeOfImage += new_section_size;
 391       strncpy (dst_section->Name, new_section_name, sizeof (dst_section->Name));
 392       dst_section->VirtualAddress =
 393         section[-1].VirtualAddress
 394         + ROUND_UP (section[-1].Misc.VirtualSize,
 395                     dst_nt_header->OptionalHeader.SectionAlignment);
 396       dst_section->Misc.VirtualSize = new_section_size;
 397       dst_section->PointerToRawData = 0;
 398       dst_section->SizeOfRawData = 0;
 399       dst_section->Characteristics =
 400         IMAGE_SCN_CNT_UNINITIALIZED_DATA
 401         | IMAGE_SCN_MEM_READ
 402         | IMAGE_SCN_MEM_WRITE;
 403     }
 404
 405   /* Copy remainder of source image.  */
 406   section--;
 407   offset = ROUND_UP (section->PointerToRawData + section->SizeOfRawData,
 408                      nt_header->OptionalHeader.FileAlignment);
 409   COPY_CHUNK
 410     ("Copying remainder of executable...",
 411      OFFSET_TO_PTR (offset, p_infile),
 412      p_infile->size - offset, be_verbose);
 413
 414   /* Final size for new image.  */
 415   p_outfile->size = DST_TO_OFFSET ();
 416
 417   /* Now patch up remaining file-relative offsets.  */
 418   section = IMAGE_FIRST_SECTION (nt_header);
 419   dst_section = IMAGE_FIRST_SECTION (dst_nt_header);
 420
 421 #define ADJUST_OFFSET(var)                                              \
 422   do {                                                                  \
 423     if ((var) != 0)                                                     \
 424       (var) = relocate_offset ((var), nt_header, dst_nt_header);        \
 425   } while (0)
 426
 427   dst_nt_header->OptionalHeader.SizeOfInitializedData = 0;
 428   dst_nt_header->OptionalHeader.SizeOfUninitializedData = 0;
 429   for (i = 0; i < dst_nt_header->FileHeader.NumberOfSections; i++)
 430     {
 431       /* Recompute data sizes for completeness.  */
 432       if (dst_section[i].Characteristics & IMAGE_SCN_CNT_INITIALIZED_DATA)
 433         dst_nt_header->OptionalHeader.SizeOfInitializedData +=
 434           ROUND_UP (dst_section[i].Misc.VirtualSize, dst_nt_header->OptionalHeader.FileAlignment);
 435       else if (dst_section[i].Characteristics & IMAGE_SCN_CNT_UNINITIALIZED_DATA)
 436         dst_nt_header->OptionalHeader.SizeOfUninitializedData +=
 437           ROUND_UP (dst_section[i].Misc.VirtualSize, dst_nt_header->OptionalHeader.FileAlignment);
 438
 439       ADJUST_OFFSET (dst_section[i].PointerToLinenumbers);
 440     }
 441
 442   ADJUST_OFFSET (dst_nt_header->FileHeader.PointerToSymbolTable);
 443
 444   /* Update offsets in debug directory entries. */
 445   {
 446     IMAGE_DATA_DIRECTORY debug_dir =
 447       dst_nt_header->OptionalHeader.DataDirectory[IMAGE_DIRECTORY_ENTRY_DEBUG];
 448     PIMAGE_DEBUG_DIRECTORY debug_entry;
 449
 450     section = rva_to_section (debug_dir.VirtualAddress, dst_nt_header);
 451     if (section)
 452       {
 453         debug_entry = (PIMAGE_DEBUG_DIRECTORY)
 454           (RVA_TO_OFFSET (debug_dir.VirtualAddress, section) + p_outfile->file_base);
 455         debug_dir.Size /= sizeof (IMAGE_DEBUG_DIRECTORY);
 456
 457         for (i = 0; i < debug_dir.Size; i++, debug_entry++)
 458           ADJUST_OFFSET (debug_entry->PointerToRawData);
 459       }
 460   }
 461 }
 462
 463
 464 int
 465 main (int argc, char **argv)
 466 {
 467   file_data in_file, out_file;
 468   char out_filename[MAX_PATH], in_filename[MAX_PATH];
 469   unsigned long size;
 470   PIMAGE_DOS_HEADER dos_header;
 471   PIMAGE_NT_HEADERS nt_header;
 472
 473 #define OLD_NAME        argv[1]
 474 #define NEW_NAME        argv[2]
 475 #define SECTION_NAME    argv[3]
 476 #define SECTION_SIZE    argv[4]
 477
 478   strcpy (in_filename, OLD_NAME);
 479   strcpy (out_filename, NEW_NAME);
 480
 481   printf ("Dumping from %s\n", in_filename);
 482   printf ("          to %s\n", out_filename);
 483
 484   /* Open the undumped executable file.  */
 485   if (!open_input_file (&in_file, in_filename))
 486     {
 487       printf ("Failed to open %s (%d)...bailing.\n",
 488               in_filename, GetLastError ());
 489       exit (1);
 490     }
 491   dos_header = (PIMAGE_DOS_HEADER) in_file.file_base;
 492   nt_header = (PIMAGE_NT_HEADERS) ((char *) dos_header + dos_header->e_lfanew);
 493   /* Allow for expansion due to increasing file align to section align.
 494      We can overestimate here, since close_file_data will update the
 495      size exactly.  */
 496   size = in_file.size
 497     + nt_header->OptionalHeader.SectionAlignment
 498     * nt_header->FileHeader.NumberOfSections;
 499   if (!open_output_file (&out_file, out_filename, size))
 500     {
 501       printf ("Failed to open %s (%d)...bailing.\n",
 502               out_filename, GetLastError ());
 503       exit (1);
 504     }
 505
 506   copy_executable_and_add_section (&in_file, &out_file,
 507                                    SECTION_NAME,
 508                                    atoi (SECTION_SIZE) * 1024 * 1024);
 509
 510   /* Patch up header fields; profiler is picky about this. */
 511   {
 512     HANDLE hImagehelp = LoadLibrary ("imagehlp.dll");
 513     DWORD_PTR  headersum;
 514     DWORD_PTR  checksum;
 515
 516     dos_header = (PIMAGE_DOS_HEADER) out_file.file_base;
 517     nt_header = (PIMAGE_NT_HEADERS) ((char *) dos_header + dos_header->e_lfanew);
 518
 519     nt_header->OptionalHeader.CheckSum = 0;
 520 //    nt_header->FileHeader.TimeDateStamp = time (NULL);
 521 //    dos_header->e_cp = size / 512;
 522 //    nt_header->OptionalHeader.SizeOfImage = size;
 523
 524     pfnCheckSumMappedFile = (void *) GetProcAddress (hImagehelp, "CheckSumMappedFile");
 525     if (pfnCheckSumMappedFile)
 526       {
 527 //      nt_header->FileHeader.TimeDateStamp = time (NULL);
 528         pfnCheckSumMappedFile (out_file.file_base,
 529                                out_file.size,
 530                                &headersum,
 531                                &checksum);
 532         nt_header->OptionalHeader.CheckSum = checksum;
 533       }
 534     FreeLibrary (hImagehelp);
 535   }
 536
 537   close_file_data (&in_file);
 538   close_file_data (&out_file);
 539
 540   return 0;
 541 }
 542
 543 /* eof */
 544