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   1 /*
   2  * File pe_module.c - handle PE module information
   3  *
   4  * Copyright (C) 1996,      Eric Youngdale.
   5  * Copyright (C) 1999-2000, Ulrich Weigand.
   6  * Copyright (C) 2004-2007, Eric Pouech.
   7  *
   8  * This library is free software; you can redistribute it and/or
   9  * modify it under the terms of the GNU Lesser General Public
  10  * License as published by the Free Software Foundation; either
  11  * version 2.1 of the License, or (at your option) any later version.
  12  *
  13  * This library is distributed in the hope that it will be useful,
  14  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  16  * Lesser General Public License for more details.
  17  *
  18  * You should have received a copy of the GNU Lesser General Public
  19  * License along with this library; if not, write to the Free Software
  20  * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA
  21  *
  22  */
  23
  24 #include "config.h"
  25 #include <stdlib.h>
  26 #include <stdio.h>
  27 #include <string.h>
  28 #include <assert.h>
  29
  30 #include "dbghelp_private.h"
  31 #include "winternl.h"
  32 #include "wine/debug.h"
  33
  34 WINE_DEFAULT_DEBUG_CHANNEL(dbghelp);
  35
  36 /******************************************************************
  37  *              pe_load_stabs
  38  *
  39  * look for stabs information in PE header (it's how the mingw compiler provides
  40  * its debugging information)
  41  */
  42 static BOOL pe_load_stabs(const struct process* pcs, struct module* module,
  43                           const void* mapping, IMAGE_NT_HEADERS* nth)
  44 {
  45     IMAGE_SECTION_HEADER*       section;
  46     int                         i, stabsize = 0, stabstrsize = 0;
  47     unsigned int                stabs = 0, stabstr = 0;
  48     BOOL                        ret = FALSE;
  49
  50     section = (IMAGE_SECTION_HEADER*)
  51         ((char*)&nth->OptionalHeader + nth->FileHeader.SizeOfOptionalHeader);
  52     for (i = 0; i < nth->FileHeader.NumberOfSections; i++, section++)
  53     {
  54         if (!strcasecmp((const char*)section->Name, ".stab"))
  55         {
  56             stabs = section->VirtualAddress;
  57             stabsize = section->SizeOfRawData;
  58         }
  59         else if (!strncasecmp((const char*)section->Name, ".stabstr", 8))
  60         {
  61             stabstr = section->VirtualAddress;
  62             stabstrsize = section->SizeOfRawData;
  63         }
  64     }
  65
  66     if (stabstrsize && stabsize)
  67     {
  68         ret = stabs_parse(module,
  69                           module->module.BaseOfImage - nth->OptionalHeader.ImageBase,
  70                           RtlImageRvaToVa(nth, (void*)mapping, stabs, NULL),
  71                           stabsize,
  72                           RtlImageRvaToVa(nth, (void*)mapping, stabstr, NULL),
  73                           stabstrsize);
  74     }
  75     return ret;
  76 }
  77
  78 static BOOL CALLBACK dbg_match(const char* file, void* user)
  79 {
  80     /* accept first file */
  81     return FALSE;
  82 }
  83
  84 /******************************************************************
  85  *              pe_load_dbg_file
  86  *
  87  * loads a .dbg file
  88  */
  89 static BOOL pe_load_dbg_file(const struct process* pcs, struct module* module,
  90                              const char* dbg_name, DWORD timestamp)
  91 {
  92     char                                tmp[MAX_PATH];
  93     HANDLE                              hFile = INVALID_HANDLE_VALUE, hMap = 0;
  94     const BYTE*                         dbg_mapping = NULL;
  95     const IMAGE_SEPARATE_DEBUG_HEADER*  hdr;
  96     const IMAGE_DEBUG_DIRECTORY*        dbg;
  97     BOOL                                ret = FALSE;
  98
  99     WINE_TRACE("Processing DBG file %s\n", dbg_name);
 100
 101     if (SymFindFileInPath(pcs->handle, NULL, dbg_name, NULL, 0, 0, 0, tmp, dbg_match, NULL) &&
 102         (hFile = CreateFileA(tmp, GENERIC_READ, FILE_SHARE_READ, NULL,
 103                              OPEN_EXISTING, FILE_ATTRIBUTE_NORMAL, NULL)) != INVALID_HANDLE_VALUE &&
 104         ((hMap = CreateFileMappingW(hFile, NULL, PAGE_READONLY, 0, 0, NULL)) != 0) &&
 105         ((dbg_mapping = MapViewOfFile(hMap, FILE_MAP_READ, 0, 0, 0)) != NULL))
 106     {
 107         hdr = (const IMAGE_SEPARATE_DEBUG_HEADER*)dbg_mapping;
 108         if (hdr->TimeDateStamp != timestamp)
 109         {
 110             WINE_ERR("Warning - %s has incorrect internal timestamp\n",
 111                      dbg_name);
 112             /*
 113              * Well, sometimes this happens to DBG files which ARE REALLY the
 114              * right .DBG files but nonetheless this check fails. Anyway,
 115              * WINDBG (debugger for Windows by Microsoft) loads debug symbols
 116              * which have incorrect timestamps.
 117              */
 118         }
 119         if (hdr->Signature == IMAGE_SEPARATE_DEBUG_SIGNATURE)
 120         {
 121             /* section headers come immediately after debug header */
 122             const IMAGE_SECTION_HEADER *sectp =
 123                 (const IMAGE_SECTION_HEADER*)(hdr + 1);
 124             /* and after that and the exported names comes the debug directory */
 125             dbg = (const IMAGE_DEBUG_DIRECTORY*)
 126                 (dbg_mapping + sizeof(*hdr) +
 127                  hdr->NumberOfSections * sizeof(IMAGE_SECTION_HEADER) +
 128                  hdr->ExportedNamesSize);
 129
 130
 131             ret = pe_load_debug_directory(pcs, module, dbg_mapping, sectp,
 132                                           hdr->NumberOfSections, dbg,
 133                                           hdr->DebugDirectorySize / sizeof(*dbg));
 134         }
 135         else
 136             ERR("Wrong signature in .DBG file %s\n", debugstr_a(tmp));
 137     }
 138     else
 139         WINE_ERR("-Unable to peruse .DBG file %s (%s)\n", dbg_name, debugstr_a(tmp));
 140
 141     if (dbg_mapping) UnmapViewOfFile(dbg_mapping);
 142     if (hMap) CloseHandle(hMap);
 143     if (hFile != INVALID_HANDLE_VALUE) CloseHandle(hFile);
 144     return ret;
 145 }
 146
 147 /******************************************************************
 148  *              pe_load_msc_debug_info
 149  *
 150  * Process MSC debug information in PE file.
 151  */
 152 static BOOL pe_load_msc_debug_info(const struct process* pcs,
 153                                    struct module* module,
 154                                    const void* mapping, IMAGE_NT_HEADERS* nth)
 155 {
 156     BOOL                        ret = FALSE;
 157     const IMAGE_DATA_DIRECTORY* dir;
 158     const IMAGE_DEBUG_DIRECTORY*dbg = NULL;
 159     int                         nDbg;
 160
 161     /* Read in debug directory */
 162     dir = nth->OptionalHeader.DataDirectory + IMAGE_DIRECTORY_ENTRY_DEBUG;
 163     nDbg = dir->Size / sizeof(IMAGE_DEBUG_DIRECTORY);
 164     if (!nDbg) return FALSE;
 165
 166     dbg = RtlImageRvaToVa(nth, (void*)mapping, dir->VirtualAddress, NULL);
 167
 168     /* Parse debug directory */
 169     if (nth->FileHeader.Characteristics & IMAGE_FILE_DEBUG_STRIPPED)
 170     {
 171         /* Debug info is stripped to .DBG file */
 172         const IMAGE_DEBUG_MISC* misc = (const IMAGE_DEBUG_MISC*)
 173             ((const char*)mapping + dbg->PointerToRawData);
 174
 175         if (nDbg != 1 || dbg->Type != IMAGE_DEBUG_TYPE_MISC ||
 176             misc->DataType != IMAGE_DEBUG_MISC_EXENAME)
 177         {
 178             WINE_ERR("-Debug info stripped, but no .DBG file in module %s\n",
 179                      debugstr_w(module->module.ModuleName));
 180         }
 181         else
 182         {
 183             ret = pe_load_dbg_file(pcs, module, (const char*)misc->Data, nth->FileHeader.TimeDateStamp);
 184         }
 185     }
 186     else
 187     {
 188         const IMAGE_SECTION_HEADER *sectp = (const IMAGE_SECTION_HEADER*)((const char*)&nth->OptionalHeader + nth->FileHeader.SizeOfOptionalHeader);
 189         /* Debug info is embedded into PE module */
 190         ret = pe_load_debug_directory(pcs, module, mapping, sectp,
 191             nth->FileHeader.NumberOfSections, dbg, nDbg);
 192     }
 193
 194     return ret;
 195 }
 196
 197 /***********************************************************************
 198  *                      pe_load_export_debug_info
 199  */
 200 static BOOL pe_load_export_debug_info(const struct process* pcs,
 201                                       struct module* module,
 202                                       const void* mapping, IMAGE_NT_HEADERS* nth)
 203 {
 204     unsigned int                        i;
 205     const IMAGE_EXPORT_DIRECTORY*       exports;
 206     DWORD                               base = module->module.BaseOfImage;
 207     DWORD                               size;
 208
 209     if (dbghelp_options & SYMOPT_NO_PUBLICS) return TRUE;
 210
 211 #if 0
 212     /* Add start of DLL (better use the (yet unimplemented) Exe SymTag for this) */
 213     /* FIXME: module.ModuleName isn't correctly set yet if it's passed in SymLoadModule */
 214     symt_new_public(module, NULL, module->module.ModuleName, base, 1,
 215                     TRUE /* FIXME */, TRUE /* FIXME */);
 216 #endif
 217
 218     /* Add entry point */
 219     symt_new_public(module, NULL, "EntryPoint",
 220                     base + nth->OptionalHeader.AddressOfEntryPoint, 1,
 221                     TRUE, TRUE);
 222 #if 0
 223     /* FIXME: we'd better store addresses linked to sections rather than
 224        absolute values */
 225     IMAGE_SECTION_HEADER*       section;
 226     /* Add start of sections */
 227     section = (IMAGE_SECTION_HEADER*)
 228         ((char*)&nth->OptionalHeader + nth->FileHeader.SizeOfOptionalHeader);
 229     for (i = 0; i < nth->FileHeader.NumberOfSections; i++, section++)
 230     {
 231         symt_new_public(module, NULL, section->Name,
 232                         RtlImageRvaToVa(nth, (void*)mapping, section->VirtualAddress, NULL),
 233                         1, TRUE /* FIXME */, TRUE /* FIXME */);
 234     }
 235 #endif
 236
 237     /* Add exported functions */
 238     if ((exports = RtlImageDirectoryEntryToData((void*)mapping, FALSE,
 239                                                 IMAGE_DIRECTORY_ENTRY_EXPORT, &size)))
 240     {
 241         const WORD*             ordinals = NULL;
 242         const DWORD_PTR*        functions = NULL;
 243         const DWORD*            names = NULL;
 244         unsigned int            j;
 245         char                    buffer[16];
 246
 247         functions = RtlImageRvaToVa(nth, (void*)mapping, exports->AddressOfFunctions, NULL);
 248         ordinals  = RtlImageRvaToVa(nth, (void*)mapping, exports->AddressOfNameOrdinals, NULL);
 249         names     = RtlImageRvaToVa(nth, (void*)mapping, exports->AddressOfNames, NULL);
 250
 251         if (functions && ordinals && names)
 252         {
 253             for (i = 0; i < exports->NumberOfNames; i++)
 254             {
 255                 if (!names[i]) continue;
 256                 symt_new_public(module, NULL,
 257                                 RtlImageRvaToVa(nth, (void*)mapping, names[i], NULL),
 258                                 base + functions[ordinals[i]],
 259                                 1, TRUE /* FIXME */, TRUE /* FIXME */);
 260             }
 261
 262             for (i = 0; i < exports->NumberOfFunctions; i++)
 263             {
 264                 if (!functions[i]) continue;
 265                 /* Check if we already added it with a name */
 266                 for (j = 0; j < exports->NumberOfNames; j++)
 267                     if ((ordinals[j] == i) && names[j]) break;
 268                 if (j < exports->NumberOfNames) continue;
 269                 snprintf(buffer, sizeof(buffer), "%d", i + exports->Base);
 270                 symt_new_public(module, NULL, buffer, base + (DWORD)functions[i], 1,
 271                                 TRUE /* FIXME */, TRUE /* FIXME */);
 272             }
 273         }
 274     }
 275     /* no real debug info, only entry points */
 276     if (module->module.SymType == SymDeferred)
 277         module->module.SymType = SymExport;
 278     return TRUE;
 279 }
 280
 281 /******************************************************************
 282  *              pe_load_debug_info
 283  *
 284  */
 285 BOOL pe_load_debug_info(const struct process* pcs, struct module* module)
 286 {
 287     BOOL                ret = FALSE;
 288     HANDLE              hFile;
 289     HANDLE              hMap;
 290     void*               mapping;
 291     IMAGE_NT_HEADERS*   nth;
 292
 293     hFile = CreateFileW(module->module.LoadedImageName, GENERIC_READ, FILE_SHARE_READ,
 294                         NULL, OPEN_EXISTING, FILE_ATTRIBUTE_NORMAL, NULL);
 295     if (hFile == INVALID_HANDLE_VALUE) return ret;
 296     if ((hMap = CreateFileMappingW(hFile, NULL, PAGE_READONLY, 0, 0, NULL)) != 0)
 297     {
 298         if ((mapping = MapViewOfFile(hMap, FILE_MAP_READ, 0, 0, 0)) != NULL)
 299         {
 300             nth = RtlImageNtHeader(mapping);
 301
 302             if (!(dbghelp_options & SYMOPT_PUBLICS_ONLY))
 303             {
 304                 ret = pe_load_stabs(pcs, module, mapping, nth) ||
 305                     pe_load_msc_debug_info(pcs, module, mapping, nth);
 306                 /* if we still have no debug info (we could only get SymExport at this
 307                  * point), then do the SymExport except if we have an ELF container,
 308                  * in which case we'll rely on the export's on the ELF side
 309                  */
 310             }
 311 /* FIXME shouldn't we check that? if (!module_get_debug(pcs, module))l */
 312             if (pe_load_export_debug_info(pcs, module, mapping, nth) && !ret)
 313                 ret = TRUE;
 314             UnmapViewOfFile(mapping);
 315         }
 316         CloseHandle(hMap);
 317     }
 318     CloseHandle(hFile);
 319
 320     return ret;
 321 }
 322
 323 /******************************************************************
 324  *              pe_load_native_module
 325  *
 326  */
 327 struct module* pe_load_native_module(struct process* pcs, const WCHAR* name,
 328                                      HANDLE hFile, DWORD base, DWORD size)
 329 {
 330     struct module*      module = NULL;
 331     BOOL                opened = FALSE;
 332     HANDLE              hMap;
 333     WCHAR               loaded_name[MAX_PATH];
 334
 335     loaded_name[0] = '\0';
 336     if (!hFile)
 337     {
 338
 339         assert(name);
 340
 341         if ((hFile = FindExecutableImageExW(name, pcs->search_path, loaded_name, NULL, NULL)) == NULL)
 342             return NULL;
 343         opened = TRUE;
 344     }
 345     else if (name) strcpyW(loaded_name, name);
 346     else if (dbghelp_options & SYMOPT_DEFERRED_LOADS)
 347         FIXME("Trouble ahead (no module name passed in deferred mode)\n");
 348
 349     if ((hMap = CreateFileMappingW(hFile, NULL, PAGE_READONLY, 0, 0, NULL)) != NULL)
 350     {
 351         void*   mapping;
 352
 353         if ((mapping = MapViewOfFile(hMap, FILE_MAP_READ, 0, 0, 0)) != NULL)
 354         {
 355             IMAGE_NT_HEADERS*   nth = RtlImageNtHeader(mapping);
 356
 357             if (nth)
 358             {
 359                 if (!base) base = nth->OptionalHeader.ImageBase;
 360                 if (!size) size = nth->OptionalHeader.SizeOfImage;
 361
 362                 module = module_new(pcs, loaded_name, DMT_PE, FALSE, base, size,
 363                                     nth->FileHeader.TimeDateStamp,
 364                                     nth->OptionalHeader.CheckSum);
 365                 if (module)
 366                 {
 367                     if (dbghelp_options & SYMOPT_DEFERRED_LOADS)
 368                         module->module.SymType = SymDeferred;
 369                     else
 370                         pe_load_debug_info(pcs, module);
 371                 }
 372             }
 373             UnmapViewOfFile(mapping);
 374         }
 375         CloseHandle(hMap);
 376     }
 377     if (opened) CloseHandle(hFile);
 378
 379     return module;
 380 }
 381
 382 /******************************************************************
 383  *              pe_load_nt_header
 384  *
 385  */
 386 BOOL pe_load_nt_header(HANDLE hProc, DWORD base, IMAGE_NT_HEADERS* nth)
 387 {
 388     IMAGE_DOS_HEADER    dos;
 389
 390     return ReadProcessMemory(hProc, (char*)base, &dos, sizeof(dos), NULL) &&
 391         dos.e_magic == IMAGE_DOS_SIGNATURE &&
 392         ReadProcessMemory(hProc, (char*)(base + dos.e_lfanew),
 393                           nth, sizeof(*nth), NULL) &&
 394         nth->Signature == IMAGE_NT_SIGNATURE;
 395 }
 396
 397 /******************************************************************
 398  *              pe_load_builtin_module
 399  *
 400  */
 401 struct module* pe_load_builtin_module(struct process* pcs, const WCHAR* name,
 402                                       DWORD base, DWORD size)
 403 {
 404     struct module*      module = NULL;
 405
 406     if (base && pcs->dbg_hdr_addr)
 407     {
 408         IMAGE_NT_HEADERS    nth;
 409
 410         if (pe_load_nt_header(pcs->handle, base, &nth))
 411         {
 412             if (!size) size = nth.OptionalHeader.SizeOfImage;
 413             module = module_new(pcs, name, DMT_PE, FALSE, base, size,
 414                                 nth.FileHeader.TimeDateStamp,
 415                                 nth.OptionalHeader.CheckSum);
 416         }
 417     }
 418     return module;
 419 }