debugger/stabs.c

   1 /* -*- tab-width: 8; c-basic-offset: 2 -*- */
   2
   3 /*
   4  * File stabs.c - read stabs information from the wine executable itself.
   5  *
   6  * Copyright (C) 1996, Eric Youngdale.
   7  */
   8
   9 #include "config.h"
  10
  11 #include <sys/types.h>
  12 #include <fcntl.h>
  13 #include <sys/stat.h>
  14 #ifdef HAVE_SYS_MMAN_H
  15 #include <sys/mman.h>
  16 #endif
  17 #include <limits.h>
  18 #include <stdio.h>
  19 #include <stdlib.h>
  20 #include <string.h>
  21 #include <unistd.h>
  22 #ifndef PATH_MAX
  23 #define PATH_MAX _MAX_PATH
  24 #endif
  25
  26 #include "options.h"
  27 #include "debugger.h"
  28
  29 #if defined(__svr4__) || defined(__sun)
  30 #define __ELF__
  31 #endif
  32
  33 #ifdef __ELF__
  34 #ifdef HAVE_ELF_H
  35 # include <elf.h>
  36 #endif
  37 #ifdef HAVE_LINK_H
  38 # include <link.h>
  39 #endif
  40 #elif defined(__EMX__)
  41 #ifdef HAVE_A_OUT_H
  42 # include <a_out.h>
  43 #endif
  44 #else
  45 #ifdef HAVE_A_OUT_H
  46 # include <a.out.h>
  47 #endif
  48 #endif
  49
  50 #ifndef N_UNDF
  51 #define N_UNDF          0x00
  52 #endif
  53
  54 #define N_GSYM          0x20
  55 #define N_FUN           0x24
  56 #define N_STSYM         0x26
  57 #define N_LCSYM         0x28
  58 #define N_MAIN          0x2a
  59 #define N_ROSYM         0x2c
  60 #define N_OPT           0x3c
  61 #define N_RSYM          0x40
  62 #define N_SLINE         0x44
  63 #define N_SO            0x64
  64 #define N_LSYM          0x80
  65 #define N_BINCL         0x82
  66 #define N_SOL           0x84
  67 #define N_PSYM          0xa0
  68 #define N_EINCL         0xa2
  69 #define N_LBRAC         0xc0
  70 #define N_EXCL          0xc2
  71 #define N_RBRAC         0xe0
  72
  73
  74 struct stab_nlist {
  75   union {
  76     char *n_name;
  77     struct stab_nlist *n_next;
  78     long n_strx;
  79   } n_un;
  80   unsigned char n_type;
  81   char n_other;
  82   short n_desc;
  83   unsigned long n_value;
  84 };
  85
  86 /*
  87  * This is used to keep track of known datatypes so that we don't redefine
  88  * them over and over again.  It sucks up lots of memory otherwise.
  89  */
  90 struct known_typedef
  91 {
  92   struct known_typedef * next;
  93   char                 * name;
  94   int                    ndefs;
  95   struct datatype      * types[1];
  96 };
  97
  98 #define NR_STAB_HASH 521
  99
 100 struct known_typedef * ktd_head[NR_STAB_HASH] = {NULL,};
 101
 102 static unsigned int stab_hash( const char * name )
 103 {
 104     unsigned int hash = 0;
 105     unsigned int tmp;
 106     const char * p;
 107
 108     p = name;
 109
 110     while (*p)
 111       {
 112         hash = (hash << 4) + *p++;
 113
 114         if( (tmp = (hash & 0xf0000000)) )
 115           {
 116             hash ^= tmp >> 24;
 117           }
 118         hash &= ~tmp;
 119       }
 120     return hash % NR_STAB_HASH;
 121 }
 122
 123
 124 static void stab_strcpy(char * dest, const char * source)
 125 {
 126   /*
 127    * A strcpy routine that stops when we hit the ':' character.
 128    * Faster than copying the whole thing, and then nuking the
 129    * ':'.
 130    */
 131   while(*source != '\0' && *source != ':')
 132       *dest++ = *source++;
 133   *dest++ = '\0';
 134 }
 135
 136 typedef struct {
 137    char*                name;
 138    unsigned long        value;
 139    int                  idx;
 140    struct datatype**    vector;
 141    int                  nrofentries;
 142 } include_def;
 143
 144 #define MAX_INCLUDES    256
 145
 146 static  include_def*    include_defs = NULL;
 147 static  int             num_include_def = 0;
 148 static  int             num_alloc_include_def = 0;
 149 static  int             cu_include_stack[MAX_INCLUDES];
 150 static  int             cu_include_stk_idx = 0;
 151 static  struct datatype**       cu_vector = NULL;
 152 static  int             cu_nrofentries = 0;
 153
 154 static
 155 int
 156 DEBUG_CreateInclude(const char* file, unsigned long val)
 157 {
 158   if (num_include_def == num_alloc_include_def)
 159     {
 160       num_alloc_include_def += 256;
 161       include_defs = DBG_realloc(include_defs, sizeof(include_defs[0])*num_alloc_include_def);
 162       memset(include_defs+num_include_def, 0, sizeof(include_defs[0])*256);
 163     }
 164   include_defs[num_include_def].name = DBG_strdup(file);
 165   include_defs[num_include_def].value = val;
 166   include_defs[num_include_def].vector = NULL;
 167   include_defs[num_include_def].nrofentries = 0;
 168
 169   return num_include_def++;
 170 }
 171
 172 static
 173 int
 174 DEBUG_FindInclude(const char* file, unsigned long val)
 175 {
 176   int           i;
 177
 178   for (i = 0; i < num_include_def; i++)
 179     {
 180       if (val == include_defs[i].value &&
 181           strcmp(file, include_defs[i].name) == 0)
 182         return i;
 183     }
 184   return -1;
 185 }
 186
 187 static
 188 int
 189 DEBUG_AddInclude(int idx)
 190 {
 191   ++cu_include_stk_idx;
 192
 193   /* is this happen, just bump MAX_INCLUDES */
 194   /* we could also handle this as another dynarray */
 195   assert(cu_include_stk_idx < MAX_INCLUDES);
 196
 197   cu_include_stack[cu_include_stk_idx] = idx;
 198   return cu_include_stk_idx;
 199 }
 200
 201 static
 202 void
 203 DEBUG_ResetIncludes(void)
 204 {
 205   /*
 206    * The datatypes that we would need to use are reset when
 207    * we start a new file. (at least the ones in filenr == 0
 208    */
 209   cu_include_stk_idx = 0;/* keep 0 as index for the .c file itself */
 210   memset(cu_vector, 0, sizeof(cu_vector[0]) * cu_nrofentries);
 211 }
 212
 213 static
 214 void
 215 DEBUG_FreeIncludes(void)
 216 {
 217   int   i;
 218
 219   DEBUG_ResetIncludes();
 220
 221   for (i = 0; i < num_include_def; i++)
 222     {
 223       DBG_free(include_defs[i].name);
 224       DBG_free(include_defs[i].vector);
 225     }
 226   DBG_free(include_defs);
 227   include_defs = NULL;
 228   num_include_def = 0;
 229   num_alloc_include_def = 0;
 230   DBG_free(cu_vector);
 231   cu_vector = NULL;
 232   cu_nrofentries = 0;
 233 }
 234
 235 #define MAX_TD_NESTING  128
 236
 237 static
 238 struct datatype**
 239 DEBUG_FileSubNr2StabEnum(int filenr, int subnr)
 240 {
 241   struct datatype** ret;
 242
 243   /* fprintf(stderr, "creating type id for (%d,%d)\n", filenr, subnr); */
 244
 245   /* FIXME: I could perhaps create a dummy include_def for each compilation
 246    * unit which would allow not to handle those two cases separately
 247    */
 248   if (filenr == 0)
 249     {
 250       if (cu_nrofentries <= subnr)
 251         {
 252           cu_vector = DBG_realloc(cu_vector, sizeof(cu_vector[0])*(subnr+1));
 253           memset(cu_vector+cu_nrofentries, 0, sizeof(cu_vector[0])*(subnr+1-cu_nrofentries));
 254           cu_nrofentries = subnr + 1;
 255         }
 256       ret = &cu_vector[subnr];
 257     }
 258   else
 259     {
 260       include_def*      idef;
 261
 262       assert(filenr <= cu_include_stk_idx);
 263
 264       idef = &include_defs[cu_include_stack[filenr]];
 265
 266       if (idef->nrofentries <= subnr)
 267         {
 268           idef->vector = DBG_realloc(idef->vector, sizeof(idef->vector[0])*(subnr+1));
 269           memset(idef->vector + idef->nrofentries, 0, sizeof(idef->vector[0])*(subnr+1-idef->nrofentries));
 270           idef->nrofentries = subnr + 1;
 271         }
 272       ret = &idef->vector[subnr];
 273     }
 274   /* fprintf(stderr,"(%d,%d) is %d\n",filenr,subnr,ret); */
 275   return ret;
 276 }
 277
 278 static
 279 struct datatype**
 280 DEBUG_ReadTypeEnumBackwards(char*x) {
 281     int filenr,subnr;
 282
 283     if (*x==')') {
 284         while (*x!='(')
 285             x--;
 286         x++;                            /* '(' */
 287         filenr=strtol(x,&x,10);         /* <int> */
 288         x++;                            /* ',' */
 289         subnr=strtol(x,&x,10);          /* <int> */
 290         x++;                            /* ')' */
 291     } else {
 292         while ((*x>='0') && (*x<='9'))
 293             x--;
 294         filenr = 0;
 295         subnr = atol(x+1);
 296     }
 297     return DEBUG_FileSubNr2StabEnum(filenr,subnr);
 298 }
 299
 300 static
 301 struct datatype**
 302 DEBUG_ReadTypeEnum(char **x) {
 303     int filenr,subnr;
 304
 305     if (**x=='(') {
 306         (*x)++;                                 /* '(' */
 307         filenr=strtol(*x,x,10);                 /* <int> */
 308         (*x)++;                                 /* ',' */
 309         subnr=strtol(*x,x,10);                  /* <int> */
 310         (*x)++;                                 /* ')' */
 311     } else {
 312         filenr = 0;
 313         subnr = strtol(*x,x,10);                /* <int> */
 314     }
 315     return DEBUG_FileSubNr2StabEnum(filenr,subnr);
 316 }
 317
 318 static
 319 int
 320 DEBUG_RegisterTypedef(const char * name, struct datatype ** types, int ndef)
 321 {
 322   int                    hash;
 323   struct known_typedef * ktd;
 324
 325   if( ndef == 1 )
 326       return TRUE;
 327
 328   ktd = (struct known_typedef *) DBG_alloc(sizeof(struct known_typedef)
 329                                          + (ndef - 1) * sizeof(struct datatype *));
 330
 331   hash = stab_hash(name);
 332
 333   ktd->name = DBG_strdup(name);
 334   ktd->ndefs = ndef;
 335   memcpy(&ktd->types[0], types, ndef * sizeof(struct datatype *));
 336   ktd->next = ktd_head[hash];
 337   ktd_head[hash] = ktd;
 338
 339   return TRUE;
 340 }
 341
 342 static
 343 int
 344 DEBUG_HandlePreviousTypedef(const char * name, const char * stab)
 345 {
 346   int                    count;
 347   enum debug_type        expect;
 348   int                    hash;
 349   struct known_typedef * ktd;
 350   char                 * ptr;
 351
 352   hash = stab_hash(name);
 353
 354   for(ktd = ktd_head[hash]; ktd; ktd = ktd->next)
 355       if ((ktd->name[0] == name[0]) && (strcmp(name, ktd->name) == 0) )
 356           break;
 357
 358   /*
 359    * Didn't find it.  This must be a new one.
 360    */
 361   if( ktd == NULL )
 362       return FALSE;
 363
 364   /*
 365    * Examine the stab to make sure it has the same number of definitions.
 366    */
 367   count = 0;
 368   for(ptr = strchr(stab, '='); ptr; ptr = strchr(ptr+1, '='))
 369     {
 370       if( count >= ktd->ndefs )
 371           return FALSE;
 372
 373       /*
 374        * Make sure the types of all of the objects is consistent with
 375        * what we have already parsed.
 376        */
 377       switch(ptr[1])
 378         {
 379         case '*':
 380           expect = DT_POINTER;
 381           break;
 382         case 's':
 383         case 'u':
 384           expect = DT_STRUCT;
 385           break;
 386         case 'a':
 387           expect = DT_ARRAY;
 388           break;
 389         case '(':       /* it's mainly a ref to another typedef, skip it */
 390           expect = -1;
 391           break;
 392         case '1':
 393         case 'r':
 394           expect = DT_BASIC;
 395           break;
 396         case 'x':
 397           expect = DT_STRUCT;
 398           break;
 399         case 'e':
 400           expect = DT_ENUM;
 401           break;
 402         case 'f':
 403           expect = DT_FUNC;
 404           break;
 405         default:
 406           fprintf(stderr, "Unknown type (%c).\n",ptr[1]);
 407           return FALSE;
 408         }
 409       if( expect != -1 && expect != DEBUG_GetType(ktd->types[count]) )
 410           return FALSE;
 411       count++;
 412     }
 413
 414   if( ktd->ndefs != count )
 415       return FALSE;
 416
 417   /*
 418    * Go through, dig out all of the type numbers, and substitute the
 419    * appropriate things.
 420    */
 421   count = 0;
 422   for(ptr = strchr(stab, '='); ptr; ptr = strchr(ptr+1, '='))
 423       *DEBUG_ReadTypeEnumBackwards(ptr-1) = ktd->types[count++];
 424
 425   return TRUE;
 426 }
 427
 428 static int DEBUG_FreeRegisteredTypedefs(void)
 429 {
 430   int                    count;
 431   int                    j;
 432   struct known_typedef * ktd;
 433   struct known_typedef * next;
 434
 435   count = 0;
 436   for(j=0; j < NR_STAB_HASH; j++ )
 437     {
 438       for(ktd = ktd_head[j]; ktd; ktd = next)
 439         {
 440           count++;
 441           next = ktd->next;
 442           DBG_free(ktd->name);
 443           DBG_free(ktd);
 444         }
 445       ktd_head[j] = NULL;
 446     }
 447
 448   return TRUE;
 449
 450 }
 451
 452 static
 453 int
 454 DEBUG_ParseTypedefStab(char * ptr, const char * typename)
 455 {
 456   int               arrmax;
 457   int               arrmin;
 458   char            * c;
 459   struct datatype * curr_type;
 460   struct datatype * datatype;
 461   struct datatype * curr_types[MAX_TD_NESTING];
 462   char              element_name[1024];
 463   int               ntypes = 0, ntp;
 464   int               offset;
 465   const char      * orig_typename;
 466   int               size;
 467   char            * tc;
 468   char            * tc2;
 469   int               failure;
 470
 471   orig_typename = typename;
 472
 473   if( DEBUG_HandlePreviousTypedef(typename, ptr) )
 474     return TRUE;
 475
 476   /*
 477    * Go from back to front.  First we go through and figure out what
 478    * type numbers we need, and register those types.  Then we go in
 479    * and fill the details.
 480    */
 481
 482   for( c = strchr(ptr, '='); c != NULL; c = strchr(c + 1, '=') )
 483     {
 484       /*
 485        * Back up until we get to a non-numeric character, to get datatype
 486        */
 487       struct datatype** dt = DEBUG_ReadTypeEnumBackwards(c-1);
 488
 489       if( ntypes >= MAX_TD_NESTING )
 490         {
 491           /*
 492            * If this ever happens, just bump the counter.
 493            */
 494           fprintf(stderr, "Typedef nesting overflow\n");
 495           return FALSE;
 496         }
 497
 498       switch(c[1])
 499         {
 500         case '*':
 501           *dt = DEBUG_NewDataType(DT_POINTER, NULL);
 502           curr_types[ntypes++] = *dt;
 503           break;
 504         case 's':
 505         case 'u':
 506           *dt = DEBUG_NewDataType(DT_STRUCT, typename);
 507           curr_types[ntypes++] = *dt;
 508           break;
 509         case 'a':
 510           *dt = DEBUG_NewDataType(DT_ARRAY, NULL);
 511           curr_types[ntypes++] = *dt;
 512           break;
 513         case '(':
 514           /* will be handled in next loop,
 515            * just a ref to another type
 516            */
 517           curr_types[ntypes++] = NULL;
 518           break;
 519         case '1':
 520         case 'r':
 521           *dt = DEBUG_NewDataType(DT_BASIC, typename);
 522           curr_types[ntypes++] = *dt;
 523           break;
 524         case 'x':
 525           stab_strcpy(element_name, c + 3);
 526           *dt = DEBUG_NewDataType(DT_STRUCT, element_name);
 527           curr_types[ntypes++] = *dt;
 528           break;
 529         case 'e':
 530           *dt = DEBUG_NewDataType(DT_ENUM, NULL);
 531           curr_types[ntypes++] = *dt;
 532           break;
 533         case 'f':
 534           *dt = DEBUG_NewDataType(DT_FUNC, NULL);
 535           curr_types[ntypes++] = *dt;
 536           break;
 537         default:
 538           fprintf(stderr, "Unknown type (%c).\n",c[1]);
 539         }
 540       typename = NULL;
 541
 542     }
 543
 544   ntp = ntypes - 1;
 545   /*
 546    * OK, now take a second sweep through.  Now we will be digging
 547    * out the definitions of the various components, and storing
 548    * them in the skeletons that we have already allocated.  We take
 549    * a right-to left search as this is much easier to parse.
 550    */
 551   for( c = strrchr(ptr, '='); c != NULL; c = strrchr(ptr, '=') )
 552     {
 553       struct datatype** dt = DEBUG_ReadTypeEnumBackwards(c-1);
 554       struct datatype** dt2;
 555
 556       curr_type = *dt;
 557
 558       switch(c[1])
 559         {
 560         case 'x':
 561           ntp--;
 562           tc = c + 3;
 563           while( *tc != ':' )
 564             tc++;
 565           tc++;
 566           if( *tc == '\0' )
 567             *c = '\0';
 568           else
 569             strcpy(c, tc);
 570           break;
 571         case '*':
 572         case 'f':
 573           ntp--;
 574           tc = c + 2;
 575           datatype = *DEBUG_ReadTypeEnum(&tc);
 576           DEBUG_SetPointerType(curr_type, datatype);
 577           if( *tc == '\0' )
 578             *c = '\0';
 579           else
 580             strcpy(c, tc);
 581           break;
 582         case '(':
 583           tc = c + 1;
 584           dt2 = DEBUG_ReadTypeEnum(&tc);
 585
 586           if (!*dt && *dt2)
 587             {
 588               *dt = *dt2;
 589             }
 590           else if (!*dt && !*dt2)
 591             {
 592               /* this should be a basic type, define it */
 593               *dt2 = *dt = DEBUG_NewDataType(DT_BASIC, typename);
 594             }
 595           else
 596             {
 597               fprintf(stderr, "Unknown condition %p %p (%s)\n", *dt, *dt2, ptr);
 598             }
 599           if( *tc == '\0' )
 600             *c = '\0';
 601           else
 602             strcpy(c, tc);
 603           curr_types[ntp--] = *dt;
 604           break;
 605         case '1':
 606         case 'r':
 607           ntp--;
 608           /*
 609            * We have already handled these above.
 610            */
 611           *c = '\0';
 612           break;
 613         case 'a':
 614           ntp--;
 615           /* ar<typeinfo_nodef>;<int>;<int>;<typeinfo>,<int>,<int>;; */
 616
 617           tc  = c + 3;
 618           /* 'r' */
 619           DEBUG_ReadTypeEnum(&tc);
 620           tc++;                                 /* ';' */
 621           arrmin = strtol(tc, &tc, 10);         /* <int> */
 622           tc++;                                 /* ';' */
 623           arrmax = strtol(tc, &tc, 10);         /* <int> */
 624           tc++;                                 /* ';' */
 625           datatype = *DEBUG_ReadTypeEnum(&tc);  /* <typeinfo> */
 626           if( *tc == '\0' )
 627             *c = '\0';
 628           else
 629             strcpy(c, tc);
 630           DEBUG_SetArrayParams(curr_type, arrmin, arrmax, datatype);
 631           break;
 632         case 's':
 633         case 'u':
 634           ntp--;
 635           failure = 0;
 636
 637           tc = c + 2;
 638           if( DEBUG_SetStructSize(curr_type, strtol(tc, &tc, 10)) == FALSE )
 639             {
 640               /*
 641                * We have already filled out this structure.  Nothing to do,
 642                * so just skip forward to the end of the definition.
 643                */
 644               while( tc[0] != ';' && tc[1] != ';' )
 645                 tc++;
 646
 647               tc += 2;
 648
 649               if( *tc == '\0' )
 650                 *c = '\0';
 651               else
 652                 strcpy(c, tc + 1);
 653               continue;
 654             }
 655
 656           /*
 657            * Now parse the individual elements of the structure/union.
 658            */
 659           while(*tc != ';')
 660             {
 661               char *ti;
 662               tc2 = element_name;
 663               while(*tc != ':')
 664                 *tc2++ = *tc++;
 665               tc++;
 666               *tc2++ = '\0';
 667               ti=tc;
 668               datatype = *DEBUG_ReadTypeEnum(&tc);
 669               *tc='\0';
 670               tc++;
 671               offset  = strtol(tc, &tc, 10);
 672               tc++;
 673               size  = strtol(tc, &tc, 10);
 674               tc++;
 675               if (datatype)
 676                 DEBUG_AddStructElement(curr_type, element_name, datatype,
 677                                        offset, size);
 678               else
 679                 {
 680                   failure = 1;
 681                   /* ... but proceed parsing to the end of the stab */
 682                   fprintf(stderr, "failure on %s %s\n", ptr, ti);
 683                 }
 684             }
 685
 686           if (failure)
 687             {
 688
 689               /* if we had a undeclared value this one is undeclared too.
 690                * remove it from the stab_types.
 691                * I just set it to NULL to detect bugs in my thoughtprocess.
 692                * FIXME: leaks the memory for the structure elements.
 693                * FIXME: such structures should have been optimized away
 694                *        by ld.
 695                */
 696               *dt = NULL;
 697             }
 698           if( *tc == '\0' )
 699             *c = '\0';
 700           else
 701             strcpy(c, tc + 1);
 702           break;
 703         case 'e':
 704           ntp--;
 705           tc = c + 2;
 706           /*
 707            * Now parse the individual elements of the structure/union.
 708            */
 709           while(*tc != ';')
 710             {
 711               tc2 = element_name;
 712               while(*tc != ':')
 713                 *tc2++ = *tc++;
 714               tc++;
 715               *tc2++ = '\0';
 716               offset  = strtol(tc, &tc, 10);
 717               tc++;
 718               DEBUG_AddStructElement(curr_type, element_name, NULL, offset, 0);
 719             }
 720           if( *tc == '\0' )
 721             *c = '\0';
 722           else
 723             strcpy(c, tc + 1);
 724           break;
 725         default:
 726           fprintf(stderr, "Unknown type (%c).\n",c[1]);
 727           break;
 728         }
 729     }
 730   /*
 731    * Now register the type so that if we encounter it again, we will know
 732    * what to do.
 733    */
 734   DEBUG_RegisterTypedef(orig_typename, curr_types, ntypes);
 735
 736   return TRUE;
 737 }
 738
 739 static struct datatype *
 740 DEBUG_ParseStabType(const char * stab)
 741 {
 742   char * c;
 743
 744   /*
 745    * Look through the stab definition, and figure out what datatype
 746    * this represents.  If we have something we know about, assign the
 747    * type.
 748    */
 749   c = strchr(stab, ':');
 750   if( c == NULL )
 751       return NULL;
 752
 753   c++;
 754   /*
 755    * The next character says more about the type (i.e. data, function, etc)
 756    * of symbol.  Skip it.
 757    */
 758   if (*c != '(')
 759     c++;
 760   /*
 761    * The next is either an integer or a (integer,integer).
 762    * The DEBUG_ReadTypeEnum takes care that stab_types is large enough.
 763    */
 764   return *DEBUG_ReadTypeEnum(&c);
 765 }
 766
 767 int
 768 DEBUG_ParseStabs(char * addr, unsigned int load_offset,
 769                  unsigned int staboff, int stablen,
 770                  unsigned int strtaboff, int strtablen)
 771 {
 772   struct name_hash    * curr_func = NULL;
 773   struct wine_locals  * curr_loc = NULL;
 774   struct name_hash    * curr_sym = NULL;
 775   char                  currpath[PATH_MAX];
 776   int                   i;
 777   int                   in_external_file = FALSE;
 778   int                   last_nso = -1;
 779   int                   len;
 780   DBG_VALUE             new_value;
 781   int                   nstab;
 782   char                * ptr;
 783   char                * stabbuff;
 784   int                   stabbufflen;
 785   struct stab_nlist   * stab_ptr;
 786   char                * strs;
 787   int                   strtabinc;
 788   char                * subpath = NULL;
 789   char                  symname[4096];
 790
 791   nstab = stablen / sizeof(struct stab_nlist);
 792   stab_ptr = (struct stab_nlist *) (addr + staboff);
 793   strs  = (char *) (addr + strtaboff);
 794
 795   memset(currpath, 0, sizeof(currpath));
 796
 797   /*
 798    * Allocate a buffer into which we can build stab strings for cases
 799    * where the stab is continued over multiple lines.
 800    */
 801   stabbufflen = 65536;
 802   stabbuff = (char *) DBG_alloc(stabbufflen);
 803
 804   strtabinc = 0;
 805   stabbuff[0] = '\0';
 806   for(i=0; i < nstab; i++, stab_ptr++ )
 807     {
 808       ptr = strs + (unsigned int) stab_ptr->n_un.n_name;
 809       if( ptr[strlen(ptr) - 1] == '\\' )
 810         {
 811           /*
 812            * Indicates continuation.  Append this to the buffer, and go onto the
 813            * next record.  Repeat the process until we find a stab without the
 814            * '/' character, as this indicates we have the whole thing.
 815            */
 816           len = strlen(ptr);
 817           if( strlen(stabbuff) + len > stabbufflen )
 818             {
 819               stabbufflen += 65536;
 820               stabbuff = (char *) DBG_realloc(stabbuff, stabbufflen);
 821             }
 822           strncat(stabbuff, ptr, len - 1);
 823           continue;
 824         }
 825       else if( stabbuff[0] != '\0' )
 826         {
 827           strcat( stabbuff, ptr);
 828           ptr = stabbuff;
 829         }
 830
 831       if( strchr(ptr, '=') != NULL )
 832         {
 833           /*
 834            * The stabs aren't in writable memory, so copy it over so we are
 835            * sure we can scribble on it.
 836            */
 837           if( ptr != stabbuff )
 838             {
 839               strcpy(stabbuff, ptr);
 840               ptr = stabbuff;
 841             }
 842           stab_strcpy(symname, ptr);
 843           DEBUG_ParseTypedefStab(ptr, symname);
 844         }
 845
 846       switch(stab_ptr->n_type)
 847         {
 848         case N_GSYM:
 849           /*
 850            * These are useless with ELF.  They have no value, and you have to
 851            * read the normal symbol table to get the address.  Thus we
 852            * ignore them, and when we process the normal symbol table
 853            * we should do the right thing.
 854            *
 855            * With a.out, they actually do make some amount of sense.
 856            */
 857           new_value.addr.seg = 0;
 858           new_value.type = DEBUG_ParseStabType(ptr);
 859           new_value.addr.off = load_offset + stab_ptr->n_value;
 860           new_value.cookie = DV_TARGET;
 861
 862           stab_strcpy(symname, ptr);
 863 #ifdef __ELF__
 864           curr_sym = DEBUG_AddSymbol( symname, &new_value, currpath,
 865                                       SYM_WINE | SYM_DATA | SYM_INVALID);
 866 #else
 867           curr_sym = DEBUG_AddSymbol( symname, &new_value, currpath,
 868                                       SYM_WINE | SYM_DATA );
 869 #endif
 870           break;
 871         case N_RBRAC:
 872         case N_LBRAC:
 873           /*
 874            * We need to keep track of these so we get symbol scoping
 875            * right for local variables.  For now, we just ignore them.
 876            * The hooks are already there for dealing with this however,
 877            * so all we need to do is to keep count of the nesting level,
 878            * and find the RBRAC for each matching LBRAC.
 879            */
 880           break;
 881         case N_LCSYM:
 882         case N_STSYM:
 883           /*
 884            * These are static symbols and BSS symbols.
 885            */
 886           new_value.addr.seg = 0;
 887           new_value.type = DEBUG_ParseStabType(ptr);
 888           new_value.addr.off = load_offset + stab_ptr->n_value;
 889           new_value.cookie = DV_TARGET;
 890
 891           stab_strcpy(symname, ptr);
 892           curr_sym = DEBUG_AddSymbol( symname, &new_value, currpath,
 893                                       SYM_WINE | SYM_DATA );
 894           break;
 895         case N_PSYM:
 896           /*
 897            * These are function parameters.
 898            */
 899           if( curr_func != NULL && !in_external_file )
 900             {
 901               stab_strcpy(symname, ptr);
 902               curr_loc = DEBUG_AddLocal( curr_func, 0,
 903                                          stab_ptr->n_value, 0, 0, symname );
 904               DEBUG_SetLocalSymbolType( curr_loc, DEBUG_ParseStabType(ptr) );
 905             }
 906           break;
 907         case N_RSYM:
 908           if( curr_func != NULL && !in_external_file )
 909             {
 910               stab_strcpy(symname, ptr);
 911               curr_loc = DEBUG_AddLocal( curr_func, stab_ptr->n_value + 1,
 912                                          0, 0, 0, symname );
 913               DEBUG_SetLocalSymbolType( curr_loc, DEBUG_ParseStabType(ptr) );
 914             }
 915           break;
 916         case N_LSYM:
 917           if( curr_func != NULL && !in_external_file )
 918             {
 919               stab_strcpy(symname, ptr);
 920               curr_loc = DEBUG_AddLocal( curr_func, 0,
 921                                          stab_ptr->n_value, 0, 0, symname );
 922               DEBUG_SetLocalSymbolType( curr_loc, DEBUG_ParseStabType(ptr) );
 923             }
 924           break;
 925         case N_SLINE:
 926           /*
 927            * This is a line number.  These are always relative to the start
 928            * of the function (N_FUN), and this makes the lookup easier.
 929            */
 930           if( curr_func != NULL && !in_external_file )
 931             {
 932 #ifdef __ELF__
 933               DEBUG_AddLineNumber(curr_func, stab_ptr->n_desc,
 934                                   stab_ptr->n_value);
 935 #else
 936 #if 0
 937               /*
 938                * This isn't right.  The order of the stabs is different under
 939                * a.out, and as a result we would end up attaching the line
 940                * number to the wrong function.
 941                */
 942               DEBUG_AddLineNumber(curr_func, stab_ptr->n_desc,
 943                                   stab_ptr->n_value - curr_func->addr.off);
 944 #endif
 945 #endif
 946             }
 947           break;
 948         case N_FUN:
 949           /*
 950            * First, clean up the previous function we were working on.
 951            */
 952           DEBUG_Normalize(curr_func);
 953
 954           /*
 955            * For now, just declare the various functions.  Later
 956            * on, we will add the line number information and the
 957            * local symbols.
 958            */
 959           if( !in_external_file )
 960             {
 961               new_value.addr.seg = 0;
 962               new_value.type = DEBUG_ParseStabType(ptr);
 963               new_value.addr.off = load_offset + stab_ptr->n_value;
 964               new_value.cookie = DV_TARGET;
 965               /*
 966                * Copy the string to a temp buffer so we
 967                * can kill everything after the ':'.  We do
 968                * it this way because otherwise we end up dirtying
 969                * all of the pages related to the stabs, and that
 970                * sucks up swap space like crazy.
 971                */
 972               stab_strcpy(symname, ptr);
 973               curr_func = DEBUG_AddSymbol( symname, &new_value, currpath,
 974                                            SYM_WINE | SYM_FUNC);
 975             }
 976           else
 977             {
 978               /*
 979                * Don't add line number information for this function
 980                * any more.
 981                */
 982               curr_func = NULL;
 983             }
 984           break;
 985         case N_SO:
 986           /*
 987            * This indicates a new source file.  Append the records
 988            * together, to build the correct path name.
 989            */
 990 #ifndef __ELF__
 991           /*
 992            * With a.out, there is no NULL string N_SO entry at the end of
 993            * the file.  Thus when we find non-consecutive entries,
 994            * we consider that a new file is started.
 995            */
 996           if( last_nso < i-1 )
 997             {
 998               currpath[0] = '\0';
 999               DEBUG_Normalize(curr_func);
1000               curr_func = NULL;
1001             }
1002 #endif
1003
1004           if( *ptr == '\0' )
1005             {
1006               /*
1007                * Nuke old path.
1008                */
1009               currpath[0] = '\0';
1010               DEBUG_Normalize(curr_func);
1011               curr_func = NULL;
1012             }
1013           else
1014             {
1015               if (*ptr != '/')
1016                 strcat(currpath, ptr);
1017               else
1018                 strcpy(currpath, ptr);
1019               subpath = ptr;
1020               DEBUG_ResetIncludes();
1021             }
1022           last_nso = i;
1023           break;
1024         case N_SOL:
1025           /*
1026            * This indicates we are including stuff from an include file.
1027            * If this is the main source, enable the debug stuff, otherwise
1028            * ignore it.
1029            */
1030           in_external_file = !(subpath == NULL || strcmp(ptr, subpath) == 0);
1031           break;
1032         case N_UNDF:
1033           strs += strtabinc;
1034           strtabinc = stab_ptr->n_value;
1035           DEBUG_Normalize(curr_func);
1036           curr_func = NULL;
1037           break;
1038         case N_OPT:
1039           /*
1040            * Ignore this.  We don't care what it points to.
1041            */
1042           break;
1043         case N_BINCL:
1044            DEBUG_AddInclude(DEBUG_CreateInclude(ptr, stab_ptr->n_value));
1045            break;
1046         case N_EINCL:
1047            break;
1048         case N_EXCL:
1049            DEBUG_AddInclude(DEBUG_FindInclude(ptr, stab_ptr->n_value));
1050            break;
1051         case N_MAIN:
1052           /*
1053            * Always ignore these.  GCC doesn't even generate them.
1054            */
1055           break;
1056         default:
1057           fprintf(stderr, "Unkown stab type 0x%02x\n", stab_ptr->n_type);
1058           break;
1059         }
1060
1061       stabbuff[0] = '\0';
1062
1063 #if 0
1064       fprintf(stderr, "%d %x %s\n", stab_ptr->n_type,
1065               (unsigned int) stab_ptr->n_value,
1066               strs + (unsigned int) stab_ptr->n_un.n_name);
1067 #endif
1068     }
1069
1070   DEBUG_FreeRegisteredTypedefs();
1071   DEBUG_FreeIncludes();
1072
1073   return TRUE;
1074 }
1075
1076 #ifdef __ELF__
1077
1078 /*
1079  * Walk through the entire symbol table and add any symbols we find there.
1080  * This can be used in cases where we have stripped ELF shared libraries,
1081  * or it can be used in cases where we have data symbols for which the address
1082  * isn't encoded in the stabs.
1083  *
1084  * This is all really quite easy, since we don't have to worry about line
1085  * numbers or local data variables.
1086  */
1087 static
1088 int
1089 DEBUG_ProcessElfSymtab(char * addr, unsigned int load_offset,
1090                        Elf32_Shdr * symtab, Elf32_Shdr * strtab)
1091 {
1092   char          * curfile = NULL;
1093   struct name_hash * curr_sym = NULL;
1094   int             flags;
1095   int             i;
1096   DBG_VALUE       new_value;
1097   int             nsym;
1098   char          * strp;
1099   char          * symname;
1100   Elf32_Sym     * symp;
1101
1102
1103   symp = (Elf32_Sym *) (addr + symtab->sh_offset);
1104   nsym = symtab->sh_size / sizeof(*symp);
1105   strp = (char *) (addr + strtab->sh_offset);
1106
1107   for(i=0; i < nsym; i++, symp++)
1108     {
1109       /*
1110        * Ignore certain types of entries which really aren't of that much
1111        * interest.
1112        */
1113       if( ELF32_ST_TYPE(symp->st_info) == STT_SECTION )
1114         {
1115           continue;
1116         }
1117
1118       symname = strp + symp->st_name;
1119
1120       /*
1121        * Save the name of the current file, so we have a way of tracking
1122        * static functions/data.
1123        */
1124       if( ELF32_ST_TYPE(symp->st_info) == STT_FILE )
1125         {
1126           curfile = symname;
1127           continue;
1128         }
1129
1130       /*
1131        * See if we already have something for this symbol.
1132        * If so, ignore this entry, because it would have come from the
1133        * stabs or from a previous symbol.  If the value is different,
1134        * we will have to keep the darned thing, because there can be
1135        * multiple local symbols by the same name.
1136        */
1137       if(    (DEBUG_GetSymbolValue(symname, -1, &new_value, FALSE ) == TRUE)
1138           && (new_value.addr.off == (load_offset + symp->st_value)) )
1139           continue;
1140
1141       new_value.addr.seg = 0;
1142       new_value.type = NULL;
1143       new_value.addr.off = load_offset + symp->st_value;
1144       new_value.cookie = DV_TARGET;
1145       flags = SYM_WINE | (ELF32_ST_BIND(symp->st_info) == STT_FUNC
1146                           ? SYM_FUNC : SYM_DATA);
1147       if( ELF32_ST_BIND(symp->st_info) == STB_GLOBAL )
1148           curr_sym = DEBUG_AddSymbol( symname, &new_value, NULL, flags );
1149       else
1150           curr_sym = DEBUG_AddSymbol( symname, &new_value, curfile, flags );
1151
1152       /*
1153        * Record the size of the symbol.  This can come in handy in
1154        * some cases.  Not really used yet, however.
1155        */
1156       if( symp->st_size != 0 )
1157           DEBUG_SetSymbolSize(curr_sym, symp->st_size);
1158     }
1159
1160   return TRUE;
1161 }
1162
1163 static
1164 int
1165 DEBUG_ProcessElfObject(const char * filename, unsigned int load_offset)
1166 {
1167   int                   rtn = FALSE;
1168   struct stat           statbuf;
1169   int                   fd = -1;
1170   int                   status;
1171   char                * addr = (char *) 0xffffffff;
1172   Elf32_Ehdr          * ehptr;
1173   Elf32_Shdr          * spnt;
1174   char                * shstrtab;
1175   int                   nsect;
1176   int                   i;
1177   int                   stabsect;
1178   int                   stabstrsect;
1179
1180
1181   /*
1182    * Make sure we can stat and open this file.
1183    */
1184   if( filename == NULL )
1185       goto leave;
1186
1187   status = stat(filename, &statbuf);
1188   if( status == -1 )
1189     {
1190       char *s,*t,*fn,*paths;
1191       if (strchr(filename,'/'))
1192         goto leave;
1193       paths = DBG_strdup(getenv("PATH"));
1194       s = paths;
1195       while (s && *s) {
1196         t = strchr(s,':');
1197         if (t) *t='\0';
1198         fn = (char*)DBG_alloc(strlen(filename)+1+strlen(s)+1);
1199         strcpy(fn,s);
1200         strcat(fn,"/");
1201         strcat(fn,filename);
1202         if ((rtn = DEBUG_ProcessElfObject(fn,load_offset))) {
1203                 DBG_free(fn);
1204                 DBG_free(paths);
1205                 goto leave;
1206         }
1207         DBG_free(fn);
1208         if (t) s = t+1; else break;
1209       }
1210       if (!s || !*s) fprintf(stderr," not found");
1211       DBG_free(paths);
1212       goto leave;
1213     }
1214
1215   /*
1216    * Now open the file, so that we can mmap() it.
1217    */
1218   fd = open(filename, O_RDONLY);
1219   if( fd == -1 )
1220       goto leave;
1221
1222
1223   /*
1224    * Now mmap() the file.
1225    */
1226   addr = mmap(0, statbuf.st_size, PROT_READ,
1227               MAP_PRIVATE, fd, 0);
1228   if( addr == (char *) 0xffffffff )
1229       goto leave;
1230
1231   /*
1232    * Next, we need to find a few of the internal ELF headers within
1233    * this thing.  We need the main executable header, and the section
1234    * table.
1235    */
1236   ehptr = (Elf32_Ehdr *) addr;
1237
1238   if( load_offset == 0 )
1239       DEBUG_RegisterELFModule(ehptr->e_entry, filename);
1240   else
1241       DEBUG_RegisterELFModule(load_offset, filename);
1242
1243   spnt = (Elf32_Shdr *) (addr + ehptr->e_shoff);
1244   nsect = ehptr->e_shnum;
1245   shstrtab = (addr + spnt[ehptr->e_shstrndx].sh_offset);
1246
1247   stabsect = stabstrsect = -1;
1248
1249   for(i=0; i < nsect; i++)
1250     {
1251       if( strcmp(shstrtab + spnt[i].sh_name, ".stab") == 0 )
1252           stabsect = i;
1253
1254       if( strcmp(shstrtab + spnt[i].sh_name, ".stabstr") == 0 )
1255           stabstrsect = i;
1256     }
1257
1258   if( stabsect == -1 || stabstrsect == -1 )
1259       goto leave;
1260
1261   /*
1262    * OK, now just parse all of the stabs.
1263    */
1264   rtn = DEBUG_ParseStabs(addr, load_offset,
1265                          spnt[stabsect].sh_offset,
1266                          spnt[stabsect].sh_size,
1267                          spnt[stabstrsect].sh_offset,
1268                          spnt[stabstrsect].sh_size);
1269
1270   if( rtn != TRUE )
1271       goto leave;
1272
1273   for(i=0; i < nsect; i++)
1274     {
1275       if(    (strcmp(shstrtab + spnt[i].sh_name, ".symtab") == 0)
1276           && (spnt[i].sh_type == SHT_SYMTAB) )
1277           DEBUG_ProcessElfSymtab(addr, load_offset,
1278                                  spnt + i, spnt + spnt[i].sh_link);
1279
1280       if(    (strcmp(shstrtab + spnt[i].sh_name, ".dynsym") == 0)
1281           && (spnt[i].sh_type == SHT_DYNSYM) )
1282           DEBUG_ProcessElfSymtab(addr, load_offset,
1283                                  spnt + i, spnt + spnt[i].sh_link);
1284     }
1285
1286 leave:
1287
1288   if( addr != (char *) 0xffffffff )
1289       munmap(addr, statbuf.st_size);
1290
1291   if( fd != -1 )
1292       close(fd);
1293
1294   return (rtn);
1295
1296 }
1297
1298 int
1299 DEBUG_ReadExecutableDbgInfo(void)
1300 {
1301   const char          * exe_name;
1302   DBG_VALUE             val;
1303   u_long                dyn_addr;
1304   Elf32_Dyn             dyn;
1305   struct r_debug        dbg_hdr;
1306   u_long                lm_addr;
1307   struct link_map       lm;
1308   Elf32_Ehdr            ehdr;
1309   char                  bufstr[256];
1310   int                   rtn = FALSE;
1311   int                   rowcount;
1312
1313   exe_name = argv0;
1314
1315   /*
1316    * Make sure we can stat and open this file.
1317    */
1318   if( exe_name == NULL )
1319       goto leave;
1320
1321   fprintf( stderr, "Loading symbols: %s", exe_name );
1322   rowcount = 17 + strlen(exe_name);
1323   DEBUG_ProcessElfObject(exe_name, 0);
1324
1325   if (!DEBUG_GetSymbolValue("_DYNAMIC", -1, &val, FALSE)) {
1326     fprintf(stderr, "Can't find symbol _DYNAMIC\n");
1327     goto leave;
1328   }
1329   dyn_addr = val.addr.off;
1330
1331   do {
1332     if (!DEBUG_READ_MEM_VERBOSE((void*)dyn_addr, &dyn, sizeof(dyn)))
1333       goto leave;
1334     dyn_addr += sizeof(dyn);
1335   } while (dyn.d_tag != DT_DEBUG && dyn.d_tag != DT_NULL);
1336   if (dyn.d_tag == DT_NULL) goto leave;
1337
1338   /*
1339    * OK, now dig into the actual tables themselves.
1340    */
1341   if (!DEBUG_READ_MEM_VERBOSE((void*)dyn.d_un.d_ptr, &dbg_hdr, sizeof(dbg_hdr)))
1342     goto leave;
1343
1344   /*
1345    * Now walk the linked list.  In all known ELF implementations,
1346    * the dynamic loader maintains this linked list for us.  In some
1347    * cases the first entry doesn't appear with a name, in other cases it
1348    * does.
1349    */
1350   for (lm_addr = (u_long)dbg_hdr.r_map; lm_addr; lm_addr = (u_long)lm.l_next)
1351     {
1352       if (!DEBUG_READ_MEM_VERBOSE((void*)lm_addr, &lm, sizeof(lm)))
1353         goto leave;
1354       if (!DEBUG_READ_MEM_VERBOSE((void*)lm.l_addr, &ehdr, sizeof(ehdr)))
1355         continue;
1356       /*
1357        * We already got the stuff for the executable using the
1358        * argv[0] entry above.  Here we only need to concentrate on any
1359        * shared libraries which may be loaded.
1360        */
1361       if( (lm.l_addr == 0) || (ehdr.e_type != ET_DYN) )
1362           continue;
1363
1364       if( lm.l_name != NULL )
1365       {
1366           if (!DEBUG_READ_MEM_VERBOSE(lm.l_name, bufstr, sizeof(bufstr)))
1367             continue;
1368           bufstr[sizeof(bufstr) - 1] = '\0';
1369           if (rowcount + strlen(bufstr) > 76)
1370           {
1371               fprintf( stderr, "\n   " );
1372               rowcount = 3;
1373           }
1374           fprintf( stderr, " %s", bufstr );
1375           rowcount += strlen(bufstr) + 1;
1376           DEBUG_ProcessElfObject(bufstr, lm.l_addr);
1377       }
1378     }
1379
1380   rtn = TRUE;
1381
1382 leave:
1383   fprintf( stderr, "\n" );
1384   return (rtn);
1385
1386 }
1387
1388 #else   /* !__ELF__ */
1389
1390 #ifdef linux
1391 /*
1392  * a.out linux.
1393  */
1394 int
1395 DEBUG_ReadExecutableDbgInfo(void)
1396 {
1397   char                * addr = (char *) 0xffffffff;
1398   char                * exe_name;
1399   struct exec         * ahdr;
1400   int                   fd = -1;
1401   int                   rtn = FALSE;
1402   unsigned int          staboff;
1403   struct stat           statbuf;
1404   int                   status;
1405   unsigned int          stroff;
1406
1407   exe_name = argv0;
1408
1409   /*
1410    * Make sure we can stat and open this file.
1411    */
1412   if( exe_name == NULL )
1413       goto leave;
1414
1415   status = stat(exe_name, &statbuf);
1416   if( status == -1 )
1417       goto leave;
1418
1419   /*
1420    * Now open the file, so that we can mmap() it.
1421    */
1422   fd = open(exe_name, O_RDONLY);
1423   if( fd == -1 )
1424       goto leave;
1425
1426
1427   /*
1428    * Now mmap() the file.
1429    */
1430   addr = mmap(0, statbuf.st_size, PROT_READ,
1431               MAP_PRIVATE, fd, 0);
1432   if( addr == (char *) 0xffffffff )
1433       goto leave;
1434
1435   ahdr = (struct exec *) addr;
1436
1437   staboff = N_SYMOFF(*ahdr);
1438   stroff = N_STROFF(*ahdr);
1439   rtn = DEBUG_ParseStabs(addr, 0,
1440                          staboff,
1441                          ahdr->a_syms,
1442                          stroff,
1443                          statbuf.st_size - stroff);
1444
1445   /*
1446    * Give a nice status message here...
1447    */
1448   fprintf( stderr, "Loading symbols: %s", exe_name );
1449
1450   rtn = TRUE;
1451
1452 leave:
1453
1454   if( addr != (char *) 0xffffffff )
1455       munmap(addr, statbuf.st_size);
1456
1457   if( fd != -1 )
1458       close(fd);
1459
1460   return (rtn);
1461
1462 }
1463 #else
1464 /*
1465  * Non-linux, non-ELF platforms.
1466  */
1467 int
1468 DEBUG_ReadExecutableDbgInfo(void)
1469 {
1470 return FALSE;
1471 }
1472 #endif
1473
1474 #endif  /* __ELF__ */