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   1 /*
   2  * File msc.c - read VC++ debug information from COFF and eventually
   3  * from PDB files.
   4  *
   5  * Copyright (C) 1996, Eric Youngdale.
   6  *
   7  * Note - this handles reading debug information for 32 bit applications
   8  * that run under Windows-NT for example.  I doubt that this would work well
   9  * for 16 bit applications, but I don't think it really matters since the
  10  * file format is different, and we should never get in here in such cases.
  11  */
  12
  13 #include <stdio.h>
  14
  15
  16 #include <sys/mman.h>
  17 #include <fcntl.h>
  18 #include <sys/stat.h>
  19 #include <limits.h>
  20 #include <strings.h>
  21 #include <unistd.h>
  22 #include <malloc.h>
  23
  24 #include "win.h"
  25 #include "pe_image.h"
  26 #include "debugger.h"
  27 #include "peexe.h"
  28 #include "xmalloc.h"
  29
  30 /*
  31  * For the type CODEVIEW debug directory entries, the debug directory
  32  * points to a structure like this.  The cv_name field is the name
  33  * of an external .PDB file.
  34  */
  35 struct CodeViewDebug
  36 {
  37         char                cv_nbtype[8];
  38         unsigned int        cv_timestamp;
  39         char                cv_unknown[4];
  40         char                cv_name[1];
  41 };
  42
  43 struct MiscDebug {
  44     unsigned int       DataType;
  45     unsigned int       Length;
  46     char               Unicode;
  47     char               Reserved[3];
  48     char               Data[1];
  49 };
  50
  51 /*
  52  * This is the header that the COFF variety of debug header points to.
  53  */
  54 struct CoffDebug {
  55     unsigned int   N_Sym;
  56     unsigned int   SymbolOffset;
  57     unsigned int   N_Linenum;
  58     unsigned int   LinenumberOffset;
  59     unsigned int   Unused[4];
  60 };
  61
  62 struct CoffLinenum {
  63         unsigned int    VirtualAddr;
  64         unsigned int    Linenum;
  65 };
  66
  67 struct CoffFiles {
  68         unsigned int    startaddr;
  69         unsigned int    endaddr;
  70         char          * filename;
  71 };
  72
  73
  74 struct CoffSymbol {
  75     union {
  76         char    ShortName[8];
  77         struct {
  78             unsigned int   NotLong;
  79             unsigned int   StrTaboff;
  80         } Name;
  81     } N;
  82     unsigned int   Value;
  83     short          SectionNumber;
  84     short          Type;
  85     char           StorageClass;
  86     unsigned char  NumberOfAuxSymbols;
  87 };
  88
  89 struct CoffAuxSection{
  90   unsigned int   Length;
  91   unsigned short NumberOfRelocations;
  92   unsigned short NumberOfLinenumbers;
  93   unsigned int   CheckSum;
  94   short          Number;
  95   char           Selection;
  96 } Section;
  97
  98 struct deferred_debug_info
  99 {
 100         struct deferred_debug_info      * next;
 101         char                            * load_addr;
 102         char                            * dbg_info;
 103         int                               dbg_size;
 104         struct PE_Debug_dir             * dbgdir;
 105         struct pe_data                  * pe;
 106 };
 107
 108 struct deferred_debug_info * dbglist = NULL;
 109
 110 /*
 111  * A simple macro that tells us whether a given COFF symbol is a
 112  * function or not.
 113  */
 114 #define N_TMASK                             0x0030
 115 #define IMAGE_SYM_DTYPE_FUNCTION            2
 116 #define N_BTSHFT                            4
 117 #define ISFCN(x) (((x) & N_TMASK) == (IMAGE_SYM_DTYPE_FUNCTION << N_BTSHFT))
 118
 119
 120 /*
 121  * This is what we are looking for in the COFF symbols.
 122  */
 123 #define IMAGE_SYM_CLASS_EXTERNAL            0x2
 124 #define IMAGE_SYM_CLASS_STATIC              0x3
 125 #define IMAGE_SYM_CLASS_FILE                0x67
 126
 127 /*
 128  * In this function, we keep track of deferred debugging information
 129  * that we may need later if we were to need to use the internal debugger.
 130  * We don't fully process it here for performance reasons.
 131  */
 132 int
 133 DEBUG_RegisterDebugInfo(int fd, struct pe_data * pe,
 134                         int load_addr, u_long v_addr, u_long size)
 135 {
 136   int                     rtn = FALSE;
 137   struct PE_Debug_dir   * dbgptr;
 138   struct deferred_debug_info * deefer;
 139
 140   dbgptr = (struct PE_Debug_dir *) (load_addr + v_addr);
 141   for(; size > 0; size -= sizeof(*dbgptr), dbgptr++ )
 142     {
 143       switch(dbgptr->type)
 144         {
 145         case IMAGE_DEBUG_TYPE_COFF:
 146         case IMAGE_DEBUG_TYPE_CODEVIEW:
 147         case IMAGE_DEBUG_TYPE_MISC:
 148           /*
 149            * This is usually an indirection to a .DBG file.
 150            * This is similar to (but a slightly older format) from the
 151            * PDB file.
 152            *
 153            * First check to see if the image was 'stripped'.  If so, it
 154            * means that this entry points to a .DBG file.  Otherwise,
 155            * it just points to itself, and we can ignore this.
 156            */
 157           if(    (dbgptr->type == IMAGE_DEBUG_TYPE_MISC)
 158               && (pe->pe_header->coff.Characteristics & IMAGE_FILE_DEBUG_STRIPPED) == 0 )
 159             {
 160               break;
 161             }
 162
 163           deefer = (struct deferred_debug_info *) xmalloc(sizeof(*deefer));
 164           deefer->pe = pe;
 165
 166           deefer->dbg_info = NULL;
 167           deefer->dbg_size = 0;
 168
 169           /*
 170            * Read the important bits.  What we do after this depends
 171            * upon the type, but this is always enough so we are able
 172            * to proceed if we know what we need to do next.
 173            */
 174           deefer->dbg_size = dbgptr->dbgsize;
 175           deefer->dbg_info = (char *) xmalloc(dbgptr->dbgsize);
 176           lseek(fd, dbgptr->dbgoff, SEEK_SET);
 177           read(fd, deefer->dbg_info, deefer->dbg_size);
 178
 179           deefer->load_addr = (char *) load_addr;
 180           deefer->dbgdir = dbgptr;
 181           deefer->next = dbglist;
 182           dbglist = deefer;
 183           break;
 184         default:
 185         }
 186     }
 187
 188   return (rtn);
 189
 190 }
 191
 192 /*
 193  * Process COFF debugging information embedded in a Win32 application.
 194  *
 195  * FIXME - we need to process the source file information and the line
 196  * numbers.
 197  */
 198 static
 199 int
 200 DEBUG_ProcessCoff(struct deferred_debug_info * deefer)
 201 {
 202   struct CoffAuxSection * aux;
 203   struct CoffDebug   * coff;
 204   struct CoffSymbol  * coff_sym;
 205   struct CoffSymbol  * coff_symbol;
 206   struct CoffLinenum * coff_linetab;
 207   char               * coff_strtab;
 208   int                  i;
 209   DBG_ADDR             new_addr;
 210   int                  rtn = FALSE;
 211   int                  naux;
 212   char                 namebuff[9];
 213   char               * nampnt;
 214   int                  nfiles = 0;
 215   int                  nfiles_alloc = 0;
 216   struct CoffFiles   * coff_files = NULL;
 217   struct CoffFiles   * curr_file = NULL;
 218   char               * this_file;
 219   int                  j;
 220
 221   coff = (struct CoffDebug *) deefer->dbg_info;
 222
 223   coff_symbol = (struct CoffSymbol *) ((unsigned int) coff + coff->SymbolOffset);
 224   coff_linetab = (struct CoffLinenum *) ((unsigned int) coff + coff->LinenumberOffset);
 225   coff_strtab = (char *) ((unsigned int) coff_symbol + 18*coff->N_Sym);
 226
 227   for(i=0; i < coff->N_Sym; i++ )
 228     {
 229       /*
 230        * We do this because some compilers (i.e. gcc) incorrectly
 231        * pad the structure up to a 4 byte boundary.  The structure
 232        * is really only 18 bytes long, so we have to manually make sure
 233        * we get it right.
 234        *
 235        * FIXME - there must be a way to have autoconf figure out the
 236        * correct compiler option for this.  If it is always gcc, that
 237        * makes life simpler, but I don't want to force this.
 238        */
 239       coff_sym = (struct CoffSymbol *) ((unsigned int) coff_symbol + 18*i);
 240       naux = coff_sym->NumberOfAuxSymbols;
 241
 242       if( coff_sym->StorageClass == IMAGE_SYM_CLASS_FILE )
 243         {
 244           if( nfiles + 1 >= nfiles_alloc )
 245             {
 246               nfiles_alloc += 10;
 247               coff_files = (struct CoffFiles *) realloc( coff_files,
 248                         nfiles_alloc * sizeof(struct CoffFiles));
 249             }
 250           curr_file = coff_files + nfiles;
 251           nfiles++;
 252           curr_file->startaddr = 0xffffffff;
 253           curr_file->endaddr   = 0;
 254           curr_file->filename =  ((char *) coff_sym) + 18;
 255         }
 256
 257       /*
 258        * This guy marks the size and location of the text section
 259        * for the current file.  We need to keep track of this so
 260        * we can figure out what file the different global functions
 261        * go with.
 262        */
 263       if(    (coff_sym->StorageClass == IMAGE_SYM_CLASS_STATIC)
 264           && (naux != 0)
 265           && (coff_sym->SectionNumber == 1) )
 266         {
 267           aux = (struct CoffAuxSection *) ((unsigned int) coff_sym + 18);
 268           if( curr_file->startaddr > coff_sym->Value )
 269             {
 270               curr_file->startaddr = coff_sym->Value;
 271             }
 272
 273           if( curr_file->startaddr > coff_sym->Value )
 274             {
 275               curr_file->startaddr = coff_sym->Value;
 276             }
 277
 278           if( curr_file->endaddr < coff_sym->Value + aux->Length )
 279             {
 280               curr_file->endaddr = coff_sym->Value + aux->Length;
 281             }
 282
 283         }
 284
 285       if(    (coff_sym->StorageClass == IMAGE_SYM_CLASS_STATIC)
 286           && (naux == 0)
 287           && (coff_sym->SectionNumber == 1) )
 288         {
 289           /*
 290            * This is a normal static function when naux == 0.
 291            * Just register it.  The current file is the correct
 292            * one in this instance.
 293            */
 294           if( coff_sym->N.Name.NotLong )
 295             {
 296               memcpy(namebuff, coff_sym->N.ShortName, 8);
 297               namebuff[8] = '\0';
 298               nampnt = &namebuff[0];
 299             }
 300           else
 301             {
 302               nampnt = coff_strtab + coff_sym->N.Name.StrTaboff;
 303             }
 304
 305           new_addr.seg = 0;
 306           new_addr.off = (int) (deefer->load_addr + coff_sym->Value);
 307           DEBUG_AddSymbol( nampnt, &new_addr, curr_file->filename );
 308         }
 309
 310       if(    (coff_sym->StorageClass == IMAGE_SYM_CLASS_EXTERNAL)
 311           && ISFCN(coff_sym->Type)
 312           && (coff_sym->SectionNumber > 0) )
 313         {
 314           if( coff_sym->N.Name.NotLong )
 315             {
 316               memcpy(namebuff, coff_sym->N.ShortName, 8);
 317               namebuff[8] = '\0';
 318               nampnt = &namebuff[0];
 319             }
 320           else
 321             {
 322               nampnt = coff_strtab + coff_sym->N.Name.StrTaboff;
 323             }
 324
 325           new_addr.seg = 0;
 326           new_addr.off = (int) (deefer->load_addr + coff_sym->Value);
 327
 328 #if 0
 329           fprintf(stderr, "%d: %x %s\n", i, new_addr.off, nampnt);
 330 #endif
 331
 332           /*
 333            * Now we need to figure out which file this guy belongs to.
 334            */
 335           this_file = NULL;
 336           for(j=0; j < nfiles; j++)
 337             {
 338               if( coff_files[j].startaddr <= coff_sym->Value
 339                   && coff_files[j].endaddr > coff_sym->Value )
 340                 {
 341                   this_file = coff_files[j].filename;
 342                   break;
 343                 }
 344             }
 345           DEBUG_AddSymbol( nampnt, &new_addr, this_file );
 346         }
 347
 348       /*
 349        * For now, skip past the aux entries.
 350        */
 351       i += naux;
 352
 353     }
 354
 355   rtn = TRUE;
 356
 357   if( coff_files != NULL )
 358     {
 359       free(coff_files);
 360     }
 361
 362   return (rtn);
 363
 364 }
 365
 366 int
 367 DEBUG_ProcessDeferredDebug()
 368 {
 369   struct deferred_debug_info * deefer;
 370   struct CodeViewDebug       * cvd;
 371   struct MiscDebug           * misc;
 372
 373   for(deefer = dbglist; deefer; deefer = deefer->next)
 374     {
 375       switch(deefer->dbgdir->type)
 376         {
 377         case IMAGE_DEBUG_TYPE_COFF:
 378           /*
 379            * Standard COFF debug information that VC++ adds when you
 380            * use /debugtype:both with the linker.
 381            */
 382 #if 0
 383           fprintf(stderr, "Processing COFF symbols...\n");
 384 #endif
 385           DEBUG_ProcessCoff(deefer);
 386           break;
 387         case IMAGE_DEBUG_TYPE_CODEVIEW:
 388           /*
 389            * This is a pointer to a PDB file of some sort.
 390            */
 391           cvd = (struct CodeViewDebug *) deefer->dbg_info;
 392 #if 0
 393           fprintf(stderr, "Processing PDB file %s\n", cvd->cv_name);
 394 #endif
 395           break;
 396         case IMAGE_DEBUG_TYPE_MISC:
 397           /*
 398            * A pointer to a .DBG file of some sort.
 399            */
 400           misc = (struct MiscDebug *) deefer->dbg_info;
 401 #if 0
 402           fprintf(stderr, "Processing DBG file %s\n", misc->Data);
 403 #endif
 404           break;
 405         default:
 406           /*
 407            * We should never get here...
 408            */
 409           break;
 410         }
 411     }
 412   return TRUE;
 413 }