debugger/source.c

   1 /*
   2  * File source.c - source file handling for internal debugger.
   3  *
   4  * Copyright (C) 1997, Eric Youngdale.
   5  *
   6  */
   7
   8 #include "config.h"
   9 #include <stdio.h>
  10 #include <stdlib.h>
  11
  12 #include <sys/types.h>
  13 #ifdef HAVE_SYS_MMAN_H
  14 #include <sys/mman.h>
  15 #endif
  16 #include <fcntl.h>
  17 #include <sys/stat.h>
  18 #include <limits.h>
  19 #include <string.h>
  20 #include <unistd.h>
  21 #ifndef PATH_MAX
  22 #define PATH_MAX _MAX_PATH
  23 #endif
  24
  25 #include "debugger.h"
  26
  27 struct searchlist
  28 {
  29   char * path;
  30   struct searchlist * next;
  31 };
  32
  33
  34 struct open_filelist
  35 {
  36   char                  * path;
  37   char                  * real_path;
  38   struct open_filelist  * next;
  39   unsigned int            size;
  40   signed int              nlines;
  41   unsigned int          * linelist;
  42 };
  43
  44 static struct open_filelist * ofiles;
  45
  46 static struct searchlist * listhead;
  47 static char DEBUG_current_sourcefile[PATH_MAX];
  48 static int DEBUG_start_sourceline = -1;
  49 static int DEBUG_end_sourceline = -1;
  50
  51 void
  52 DEBUG_ShowDir(void)
  53 {
  54   struct searchlist * sl;
  55
  56   DEBUG_Printf(DBG_CHN_MESG,"Search list :\n");
  57   for(sl = listhead; sl; sl = sl->next)
  58     {
  59       DEBUG_Printf(DBG_CHN_MESG, "\t%s\n", sl->path);
  60     }
  61   DEBUG_Printf(DBG_CHN_MESG, "\n");
  62 }
  63
  64 void
  65 DEBUG_AddPath(const char * path)
  66 {
  67   struct searchlist * sl;
  68
  69   sl = (struct searchlist *) DBG_alloc(sizeof(struct searchlist));
  70   if( sl == NULL )
  71     {
  72       return;
  73     }
  74
  75   sl->next = listhead;
  76   sl->path = DBG_strdup(path);
  77   listhead = sl;
  78 }
  79
  80 void
  81 DEBUG_NukePath(void)
  82 {
  83   struct searchlist * sl;
  84   struct searchlist * nxt;
  85
  86   for(sl = listhead; sl; sl = nxt)
  87     {
  88       nxt = sl->next;
  89       DBG_free(sl->path);
  90       DBG_free(sl);
  91     }
  92
  93   listhead = NULL;
  94 }
  95
  96 static
  97 int
  98 DEBUG_DisplaySource(char * sourcefile, int start, int end)
  99 {
 100   char                        * addr;
 101   char                          buffer[1024];
 102   int                           fd;
 103   int                           i;
 104   struct open_filelist        * ol;
 105   int                           nlines;
 106   char                        * basename = NULL;
 107   char                        * pnt;
 108   int                           rtn;
 109   struct searchlist           * sl;
 110   struct stat                   statbuf;
 111   int                           status;
 112   char                          tmppath[PATH_MAX];
 113
 114   /*
 115    * First see whether we have the file open already.  If so, then
 116    * use that, otherwise we have to try and open it.
 117    */
 118   for(ol = ofiles; ol; ol = ol->next)
 119     {
 120       if( strcmp(ol->path, sourcefile) == 0 )
 121         {
 122           break;
 123         }
 124     }
 125
 126   if( ol == NULL )
 127     {
 128       /*
 129        * Try again, stripping the path from the opened file.
 130        */
 131       basename = strrchr(sourcefile, '\\' );
 132       if ( !basename )
 133           basename = strrchr(sourcefile, '/' );
 134       if ( !basename )
 135           basename = sourcefile;
 136       else
 137           basename++;
 138
 139       for(ol = ofiles; ol; ol = ol->next)
 140         {
 141           if( strcmp(ol->path, basename) == 0 )
 142             {
 143               break;
 144             }
 145         }
 146
 147     }
 148
 149   if( ol == NULL )
 150     {
 151       /*
 152        * Crapola.  We need to try and open the file.
 153        */
 154       status = stat(sourcefile, &statbuf);
 155       if( status != -1 )
 156         {
 157           strcpy(tmppath, sourcefile);
 158         }
 159       else if( (status = stat(basename, &statbuf)) != -1 )
 160         {
 161           strcpy(tmppath, basename);
 162         }
 163       else
 164         {
 165           for(sl = listhead; sl; sl = sl->next)
 166             {
 167               strcpy(tmppath, sl->path);
 168               if( tmppath[strlen(tmppath)-1] != '/' )
 169                 {
 170                   strcat(tmppath, "/");
 171                 }
 172               /*
 173                * Now append the base file name.
 174                */
 175               strcat(tmppath, basename);
 176
 177               status = stat(tmppath, &statbuf);
 178               if( status != -1 )
 179                 {
 180                   break;
 181                 }
 182             }
 183
 184           if( sl == NULL )
 185             {
 186               char      zbuf[256];
 187               /*
 188                * Still couldn't find it.  Ask user for path to add.
 189                */
 190               sprintf(zbuf, "Enter path to file '%s': ", sourcefile);
 191               DEBUG_ReadLine(zbuf, tmppath, sizeof(tmppath), FALSE, FALSE);
 192
 193               if( tmppath[strlen(tmppath)-1] == '\n' )
 194                 {
 195                   tmppath[strlen(tmppath)-1] = '\0';
 196                 }
 197
 198               if( tmppath[strlen(tmppath)-1] != '/' )
 199                 {
 200                   strcat(tmppath, "/");
 201                 }
 202               /*
 203                * Now append the base file name.
 204                */
 205               strcat(tmppath, basename);
 206
 207               status = stat(tmppath, &statbuf);
 208               if( status == -1 )
 209                 {
 210                   /*
 211                    * OK, I guess the user doesn't really want to see it
 212                    * after all.
 213                    */
 214                   ol = (struct open_filelist *) DBG_alloc(sizeof(*ol));
 215                   ol->path = DBG_strdup(sourcefile);
 216                   ol->real_path = NULL;
 217                   ol->next = ofiles;
 218                   ol->nlines = 0;
 219                   ol->linelist = NULL;
 220                   ofiles = ol;
 221                   DEBUG_Printf(DBG_CHN_MESG,"Unable to open file %s\n", tmppath);
 222                   return FALSE;
 223                 }
 224             }
 225         }
 226       /*
 227        * Create header for file.
 228        */
 229       ol = (struct open_filelist *) DBG_alloc(sizeof(*ol));
 230       ol->path = DBG_strdup(sourcefile);
 231       ol->real_path = DBG_strdup(tmppath);
 232       ol->next = ofiles;
 233       ol->nlines = 0;
 234       ol->linelist = NULL;
 235       ol->size = statbuf.st_size;
 236       ofiles = ol;
 237
 238       /*
 239        * Now open and map the file.
 240        */
 241       fd = open(tmppath, O_RDONLY);
 242       if( fd == -1 )
 243         {
 244           return FALSE;
 245         }
 246
 247       addr = mmap(0, statbuf.st_size, PROT_READ, MAP_PRIVATE, fd, 0);
 248       if( addr == (char *) -1 )
 249         {
 250           return FALSE;
 251         }
 252
 253       /*
 254        * Now build up the line number mapping table.
 255        */
 256       ol->nlines = 1;
 257       pnt = addr;
 258       while(pnt < addr + ol->size )
 259         {
 260           if( *pnt++ == '\n' )
 261             {
 262               ol->nlines++;
 263             }
 264         }
 265
 266       ol->nlines++;
 267       ol->linelist = (unsigned int*) DBG_alloc( ol->nlines * sizeof(unsigned int) );
 268
 269       nlines = 0;
 270       pnt = addr;
 271       ol->linelist[nlines++] = 0;
 272       while(pnt < addr + ol->size )
 273         {
 274           if( *pnt++ == '\n' )
 275             {
 276               ol->linelist[nlines++] = pnt - addr;
 277             }
 278         }
 279       ol->linelist[nlines++] = pnt - addr;
 280
 281     }
 282   else
 283     {
 284       /*
 285        * We know what the file is, we just need to reopen it and remap it.
 286        */
 287       fd = open(ol->real_path, O_RDONLY);
 288       if( fd == -1 )
 289         {
 290           return FALSE;
 291         }
 292
 293       addr = mmap(0, ol->size, PROT_READ, MAP_PRIVATE, fd, 0);
 294       if( addr == (char *) -1 )
 295         {
 296           return FALSE;
 297         }
 298     }
 299
 300   /*
 301    * All we need to do is to display the source lines here.
 302    */
 303   rtn = FALSE;
 304   for(i=start - 1; i <= end - 1; i++)
 305     {
 306       if( i < 0 || i >= ol->nlines - 1)
 307         {
 308           continue;
 309         }
 310
 311       rtn = TRUE;
 312       memset(&buffer, 0, sizeof(buffer));
 313       if( ol->linelist[i+1] != ol->linelist[i] )
 314         {
 315           memcpy(&buffer, addr + ol->linelist[i],
 316                  (ol->linelist[i+1] - ol->linelist[i]) - 1);
 317         }
 318       DEBUG_Printf(DBG_CHN_MESG,"%d\t%s\n", i + 1,  buffer);
 319     }
 320
 321   munmap(addr, ol->size);
 322   close(fd);
 323
 324   return rtn;
 325
 326 }
 327
 328 void
 329 DEBUG_List(struct list_id * source1, struct list_id * source2,
 330                          int delta)
 331 {
 332   int    end;
 333   int    rtn;
 334   int    start;
 335   char * sourcefile;
 336
 337   /*
 338    * We need to see what source file we need.  Hopefully we only have
 339    * one specified, otherwise we might as well punt.
 340    */
 341   if( source1 != NULL
 342       && source2 != NULL
 343       && source1->sourcefile != NULL
 344       && source2->sourcefile != NULL
 345       && strcmp(source1->sourcefile, source2->sourcefile) != 0 )
 346     {
 347       DEBUG_Printf(DBG_CHN_MESG, "Ambiguous source file specification.\n");
 348       return;
 349     }
 350
 351   sourcefile = NULL;
 352   if( source1 != NULL && source1->sourcefile != NULL )
 353     {
 354       sourcefile = source1->sourcefile;
 355     }
 356
 357   if( sourcefile == NULL
 358       && source2 != NULL
 359       && source2->sourcefile != NULL )
 360     {
 361       sourcefile = source2->sourcefile;
 362     }
 363
 364   if( sourcefile == NULL )
 365     {
 366       sourcefile = (char *) &DEBUG_current_sourcefile;
 367     }
 368
 369   if( sourcefile == NULL )
 370     {
 371       DEBUG_Printf(DBG_CHN_MESG, "No source file specified.\n");
 372       return;
 373     }
 374
 375   /*
 376    * Now figure out the line number range to be listed.
 377    */
 378   start = -1;
 379   end = -1;
 380
 381   if( source1 != NULL )
 382     {
 383       start = source1->line;
 384     }
 385
 386   if( source2 != NULL )
 387     {
 388       end = source2->line;
 389     }
 390
 391   if( start == -1 && end == -1 )
 392     {
 393       if( delta < 0 )
 394         {
 395           end = DEBUG_start_sourceline;
 396           start = end + delta;
 397         }
 398       else
 399         {
 400           start = DEBUG_end_sourceline;
 401           end = start + delta;
 402         }
 403     }
 404   else if( start == -1 )
 405     {
 406       start = end + delta;
 407     }
 408   else if (end == -1)
 409     {
 410       end = start + delta;
 411     }
 412
 413   /*
 414    * Now call this function to do the dirty work.
 415    */
 416   rtn = DEBUG_DisplaySource(sourcefile, start, end);
 417
 418   if( sourcefile != (char *) &DEBUG_current_sourcefile )
 419     {
 420       strcpy(DEBUG_current_sourcefile, sourcefile);
 421     }
 422   DEBUG_start_sourceline = start;
 423   DEBUG_end_sourceline = end;
 424 }
 425
 426 DBG_ADDR DEBUG_LastDisassemble={0,0};
 427
 428 BOOL DEBUG_DisassembleInstruction(DBG_ADDR *addr)
 429 {
 430    char         ch;
 431    BOOL         ret = TRUE;
 432
 433    DEBUG_PrintAddress(addr, DEBUG_CurrThread->dbg_mode, TRUE);
 434    DEBUG_Printf(DBG_CHN_MESG, ": ");
 435    if (!DEBUG_READ_MEM_VERBOSE((void*)DEBUG_ToLinear(addr), &ch, sizeof(ch))) {
 436       DEBUG_Printf(DBG_CHN_MESG, "-- no code --");
 437       ret = FALSE;
 438    } else {
 439       DEBUG_Disasm(addr, TRUE);
 440    }
 441    DEBUG_Printf(DBG_CHN_MESG,"\n");
 442    return ret;
 443 }
 444
 445 void
 446 DEBUG_Disassemble(const DBG_VALUE *xstart,const DBG_VALUE *xend,int offset)
 447 {
 448   int i;
 449   DBG_ADDR      last;
 450   DBG_VALUE     end,start;
 451
 452   if (xstart) {
 453     start = *xstart;
 454     DEBUG_GrabAddress(&start, TRUE);
 455   }
 456   if (xend) {
 457     end = *xend;
 458     DEBUG_GrabAddress(&end, TRUE);
 459   }
 460   if (!xstart && !xend) {
 461     last = DEBUG_LastDisassemble;
 462     if (!last.seg && !last.off)
 463       DEBUG_GetCurrentAddress( &last );
 464
 465     for (i=0;i<offset;i++)
 466       if (!DEBUG_DisassembleInstruction(&last)) break;
 467     DEBUG_LastDisassemble = last;
 468     return;
 469   }
 470   last = start.addr;
 471   if (!xend) {
 472     for (i=0;i<offset;i++)
 473       if (!DEBUG_DisassembleInstruction(&last)) break;
 474     DEBUG_LastDisassemble = last;
 475     return;
 476   }
 477   while (last.off <= end.addr.off)
 478     if (!DEBUG_DisassembleInstruction(&last)) break;
 479   DEBUG_LastDisassemble = last;
 480   return;
 481 }
 482