git.oblomov.eu Git - wine/blob - programs/winedbg/break.c

   1 /*
   2  * Debugger break-points handling
   3  *
   4  * Copyright 1994 Martin von Loewis
   5  * Copyright 1995 Alexandre Julliard
   6  * Copyright 1999,2000 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., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  21  */
  22
  23 #include "config.h"
  24 #include "debugger.h"
  25 #include "wine/debug.h"
  26
  27 WINE_DEFAULT_DEBUG_CHANNEL(winedbg);
  28
  29 static int is_xpoint_break(int bpnum)
  30 {
  31     int type = dbg_curr_process->bp[bpnum].xpoint_type;
  32
  33     if (type == be_xpoint_break || type == be_xpoint_watch_exec) return TRUE;
  34     if (type == be_xpoint_watch_read || type == be_xpoint_watch_write) return FALSE;
  35     RaiseException(DEBUG_STATUS_INTERNAL_ERROR, 0, 0, NULL);
  36     return 0; /* never reached */
  37 }
  38
  39 /***********************************************************************
  40  *           break_set_xpoints
  41  *
  42  * Set or remove all the breakpoints & watchpoints
  43  */
  44 void  break_set_xpoints(BOOL set)
  45 {
  46     static BOOL                 last; /* = 0 = FALSE */
  47
  48     unsigned int                i, ret, size;
  49     void*                       addr;
  50     struct dbg_breakpoint*      bp = dbg_curr_process->bp;
  51
  52     if (set == last) return;
  53     last = set;
  54
  55     for (i = 0; i < dbg_curr_process->next_bp; i++)
  56     {
  57         if (!bp[i].refcount || !bp[i].enabled) continue;
  58
  59         if (is_xpoint_break(i))
  60             size = 0;
  61         else
  62             size = bp[i].w.len + 1;
  63         addr = (void*)memory_to_linear_addr(&bp[i].addr);
  64
  65         if (set)
  66             ret = be_cpu->insert_Xpoint(dbg_curr_process->handle,
  67                                         dbg_curr_process->process_io,
  68                                         &dbg_context, bp[i].xpoint_type, addr,
  69                                         &bp[i].info, size);
  70         else
  71             ret = be_cpu->remove_Xpoint(dbg_curr_process->handle,
  72                                         dbg_curr_process->process_io,
  73                                         &dbg_context, bp[i].xpoint_type, addr,
  74                                         bp[i].info, size);
  75         if (!ret)
  76         {
  77             dbg_printf("Invalid address (");
  78             print_address(&bp[i].addr, FALSE);
  79             dbg_printf(") for breakpoint %d, disabling it\n", i);
  80             bp[i].enabled = FALSE;
  81         }
  82     }
  83 }
  84
  85 /***********************************************************************
  86  *           find_xpoint
  87  *
  88  * Find the breakpoint for a given address. Return the breakpoint
  89  * number or -1 if none.
  90  */
  91 static int find_xpoint(const ADDRESS* addr, enum be_xpoint_type type)
  92 {
  93     int                         i;
  94     void*                       lin = memory_to_linear_addr(addr);
  95     struct dbg_breakpoint*      bp = dbg_curr_process->bp;
  96
  97     for (i = 0; i < dbg_curr_process->next_bp; i++)
  98     {
  99         if (bp[i].refcount && bp[i].enabled && bp[i].xpoint_type == type &&
 100             memory_to_linear_addr(&bp[i].addr) == lin)
 101             return i;
 102     }
 103     return -1;
 104 }
 105
 106 /***********************************************************************
 107  *           init_xpoint
 108  *
 109  * Find an empty slot in BP table to add a new break/watch point
 110  */
 111 static  int init_xpoint(int type, const ADDRESS* addr)
 112 {
 113     int                         num;
 114     struct dbg_breakpoint*      bp = dbg_curr_process->bp;
 115
 116     for (num = (dbg_curr_process->next_bp < MAX_BREAKPOINTS) ?
 117              dbg_curr_process->next_bp++ : 1;
 118          num < MAX_BREAKPOINTS; num++)
 119     {
 120         if (bp[num].refcount == 0)
 121         {
 122             bp[num].refcount    = 1;
 123             bp[num].enabled     = TRUE;
 124             bp[num].xpoint_type = type;
 125             bp[num].skipcount   = 0;
 126             bp[num].addr        = *addr;
 127             return num;
 128         }
 129     }
 130
 131     dbg_printf("Too many bp. Please delete some.\n");
 132     return -1;
 133 }
 134
 135 /***********************************************************************
 136  *           get_watched_value
 137  *
 138  * Returns the value watched by watch point 'num'.
 139  */
 140 static  BOOL    get_watched_value(int num, LPDWORD val)
 141 {
 142     BYTE        buf[4];
 143
 144     if (!dbg_read_memory(memory_to_linear_addr(&dbg_curr_process->bp[num].addr),
 145                          buf, dbg_curr_process->bp[num].w.len + 1))
 146         return FALSE;
 147
 148     switch (dbg_curr_process->bp[num].w.len + 1)
 149     {
 150     case 4:     *val = *(DWORD*)buf;    break;
 151     case 2:     *val = *(WORD*)buf;     break;
 152     case 1:     *val = *(BYTE*)buf;     break;
 153     default: RaiseException(DEBUG_STATUS_INTERNAL_ERROR, 0, 0, NULL);
 154     }
 155     return TRUE;
 156 }
 157
 158 /***********************************************************************
 159  *           break_add_break
 160  *
 161  * Add a breakpoint.
 162  */
 163 BOOL break_add_break(const ADDRESS* addr, BOOL verbose, BOOL swbp)
 164 {
 165     int                         num;
 166     BYTE                        ch;
 167     struct dbg_breakpoint*      bp = dbg_curr_process->bp;
 168     int                         type = swbp ? be_xpoint_break : be_xpoint_watch_exec;
 169
 170     if ((num = find_xpoint(addr, type)) >= 1)
 171     {
 172         bp[num].refcount++;
 173         dbg_printf("Breakpoint %d at ", num);
 174         print_address(&bp[num].addr, TRUE);
 175         dbg_printf(" (refcount=%d)\n", bp[num].refcount);
 176         return TRUE;
 177     }
 178
 179     if (!dbg_read_memory(memory_to_linear_addr(addr), &ch, sizeof(ch)))
 180     {
 181         if (verbose)
 182         {
 183             dbg_printf("Invalid address ");
 184             print_bare_address(addr);
 185             dbg_printf(", can't set breakpoint\n");
 186         }
 187         return FALSE;
 188     }
 189
 190     if ((num = init_xpoint(type, addr)) == -1)
 191         return FALSE;
 192
 193     dbg_printf("Breakpoint %d at ", num);
 194     print_address(&bp[num].addr, TRUE);
 195     dbg_printf("\n");
 196
 197     return TRUE;
 198 }
 199
 200 /***********************************************************************
 201  *           break_add_break_from_lvalue
 202  *
 203  * Add a breakpoint.
 204  */
 205 BOOL break_add_break_from_lvalue(const struct dbg_lvalue* lvalue, BOOL swbp)
 206 {
 207     ADDRESS     addr;
 208
 209     types_extract_as_address(lvalue, &addr);
 210
 211     if (!break_add_break(&addr, TRUE, swbp))
 212     {
 213         if (!DBG_IVAR(CanDeferOnBPByAddr))
 214         {
 215             dbg_printf("Invalid address, can't set breakpoint\n"
 216                        "You can turn on deferring bp by address by setting $CanDeferOnBPByAddr to 1\n");
 217             return FALSE;
 218         }
 219         dbg_printf("Unable to add breakpoint, will check again any time a new DLL is loaded\n");
 220         dbg_curr_process->delayed_bp =
 221             dbg_heap_realloc(dbg_curr_process->delayed_bp,
 222                              sizeof(struct dbg_delayed_bp) * ++dbg_curr_process->num_delayed_bp);
 223
 224         dbg_curr_process->delayed_bp[dbg_curr_process->num_delayed_bp - 1].is_symbol   = FALSE;
 225         dbg_curr_process->delayed_bp[dbg_curr_process->num_delayed_bp - 1].software_bp = swbp;
 226         dbg_curr_process->delayed_bp[dbg_curr_process->num_delayed_bp - 1].u.addr      = addr;
 227         return TRUE;
 228     }
 229     return FALSE;
 230 }
 231
 232 /***********************************************************************
 233  *           break_add_break_from_id
 234  *
 235  * Add a breakpoint from a function name (and eventually a line #)
 236  */
 237 void    break_add_break_from_id(const char *name, int lineno, BOOL swbp)
 238 {
 239     struct dbg_lvalue   lvalue;
 240     int                 i;
 241
 242     switch (symbol_get_lvalue(name, lineno, &lvalue, TRUE))
 243     {
 244     case sglv_found:
 245         break_add_break(&lvalue.addr, TRUE, swbp);
 246         return;
 247     case sglv_unknown:
 248         break;
 249     case sglv_aborted: /* user aborted symbol lookup */
 250         return;
 251     }
 252
 253     dbg_printf("Unable to add breakpoint, will check again when a new DLL is loaded\n");
 254     for (i = 0; i < dbg_curr_process->num_delayed_bp; i++)
 255     {
 256         if (dbg_curr_process->delayed_bp[i].is_symbol &&
 257             !strcmp(name, dbg_curr_process->delayed_bp[i].u.symbol.name) &&
 258             lineno == dbg_curr_process->delayed_bp[i].u.symbol.lineno)
 259             return;
 260     }
 261     dbg_curr_process->delayed_bp = dbg_heap_realloc(dbg_curr_process->delayed_bp,
 262                                                     sizeof(struct dbg_delayed_bp) * ++dbg_curr_process->num_delayed_bp);
 263
 264     dbg_curr_process->delayed_bp[dbg_curr_process->num_delayed_bp - 1].is_symbol       = TRUE;
 265     dbg_curr_process->delayed_bp[dbg_curr_process->num_delayed_bp - 1].software_bp     = swbp;
 266     dbg_curr_process->delayed_bp[dbg_curr_process->num_delayed_bp - 1].u.symbol.name   = strcpy(HeapAlloc(GetProcessHeap(), 0, strlen(name) + 1), name);
 267     dbg_curr_process->delayed_bp[dbg_curr_process->num_delayed_bp - 1].u.symbol.lineno = lineno;
 268 }
 269
 270 struct cb_break_lineno
 271 {
 272     int         lineno;
 273     ADDRESS     addr;
 274 };
 275
 276 static BOOL CALLBACK line_cb(SRCCODEINFO* sci, void* user)
 277 {
 278     struct cb_break_lineno*      bkln = user;
 279
 280     if (bkln->lineno == sci->LineNumber)
 281     {
 282         bkln->addr.Mode = AddrModeFlat;
 283         bkln->addr.Offset = sci->Address;
 284         return FALSE;
 285     }
 286     return TRUE;
 287 }
 288
 289 /***********************************************************************
 290  *           break_add_break_from_lineno
 291  *
 292  * Add a breakpoint from a line number in current file
 293  */
 294 void    break_add_break_from_lineno(int lineno, BOOL swbp)
 295 {
 296     struct cb_break_lineno      bkln;
 297
 298     memory_get_current_pc(&bkln.addr);
 299
 300     if (lineno != -1)
 301     {
 302         IMAGEHLP_LINE   il;
 303
 304
 305         DWORD           disp;
 306         DWORD           linear = (DWORD)memory_to_linear_addr(&bkln.addr);
 307
 308         il.SizeOfStruct = sizeof(il);
 309         if (!SymGetLineFromAddr(dbg_curr_process->handle, linear, &disp, &il))
 310
 311         {
 312             dbg_printf("Unable to add breakpoint (unknown address %lx)\n", linear);
 313             return;
 314         }
 315         bkln.addr.Offset = 0;
 316         bkln.lineno = lineno;
 317         SymEnumLines(dbg_curr_process->handle, linear, NULL, il.FileName, line_cb, &bkln);
 318         if (!bkln.addr.Offset)
 319         {
 320             dbg_printf("Unknown line number\n"
 321                        "(either out of file, or no code at given line number)\n");
 322             return;
 323         }
 324     }
 325
 326     break_add_break(&bkln.addr, TRUE, swbp);
 327 }
 328
 329 /***********************************************************************
 330  *           break_check_delayed_bp
 331  *
 332  * Check is a registered delayed BP is now available.
 333  */
 334 void break_check_delayed_bp(void)
 335 {
 336     struct dbg_lvalue           lvalue;
 337     int                         i;
 338     struct dbg_delayed_bp*      dbp = dbg_curr_process->delayed_bp;
 339
 340     for (i = 0; i < dbg_curr_process->num_delayed_bp; i++)
 341     {
 342         if (dbp[i].is_symbol)
 343         {
 344             if (symbol_get_lvalue(dbp[i].u.symbol.name, dbp[i].u.symbol.lineno,
 345                                   &lvalue, TRUE) != sglv_found)
 346                 continue;
 347             if (lvalue.cookie != DLV_TARGET) continue;
 348         }
 349         else
 350             lvalue.addr = dbp[i].u.addr;
 351         WINE_TRACE("trying to add delayed %s-bp\n", dbp[i].is_symbol ? "S" : "A");
 352         if (!dbp[i].is_symbol)
 353             WINE_TRACE("\t%04x:%08lx\n",
 354                        dbp[i].u.addr.Segment, dbp[i].u.addr.Offset);
 355         else
 356             WINE_TRACE("\t'%s' @ %d\n",
 357                        dbp[i].u.symbol.name, dbp[i].u.symbol.lineno);
 358
 359         if (break_add_break(&lvalue.addr, FALSE, dbp[i].software_bp))
 360             memmove(&dbp[i], &dbp[i+1], (--dbg_curr_process->num_delayed_bp - i) * sizeof(*dbp));
 361     }
 362 }
 363
 364 /***********************************************************************
 365  *           break_add_watch
 366  *
 367  * Add a watchpoint.
 368  */
 369 static void break_add_watch(const struct dbg_lvalue* lvalue, BOOL is_write)
 370 {
 371     int         num;
 372     DWORD64     l = 4;
 373
 374     num = init_xpoint((is_write) ? be_xpoint_watch_write : be_xpoint_watch_read,
 375                       &lvalue->addr);
 376     if (num == -1) return;
 377
 378     if (lvalue->type.id != dbg_itype_none)
 379     {
 380         if (types_get_info(&lvalue->type, TI_GET_LENGTH, &l))
 381         {
 382             switch (l)
 383             {
 384             case 4: case 2: case 1: break;
 385             default:
 386                 dbg_printf("Unsupported length (%s) for watch-points, defaulting to 4\n",
 387                            wine_dbgstr_longlong(l));
 388                 break;
 389             }
 390         }
 391         else dbg_printf("Cannot get watch size, defaulting to 4\n");
 392     }
 393     dbg_curr_process->bp[num].w.len = (DWORD)l - 1;
 394
 395     if (!get_watched_value(num, &dbg_curr_process->bp[num].w.oldval))
 396     {
 397         dbg_printf("Bad address. Watchpoint not set\n");
 398         dbg_curr_process->bp[num].refcount = 0;
 399         return;
 400     }
 401     dbg_printf("Watchpoint %d at ", num);
 402     print_address(&dbg_curr_process->bp[num].addr, TRUE);
 403     dbg_printf("\n");
 404 }
 405
 406 /******************************************************************
 407  *              break_add_watch_from_lvalue
 408  *
 409  * Adds a watch point from an address (stored in a lvalue)
 410  */
 411 void break_add_watch_from_lvalue(const struct dbg_lvalue* lvalue)
 412 {
 413     struct dbg_lvalue   lval;
 414
 415     types_extract_as_address(lvalue, &lval.addr);
 416     lval.type.id = dbg_itype_none;
 417
 418     break_add_watch(&lval, TRUE);
 419 }
 420
 421 /***********************************************************************
 422  *           break_add_watch_from_id
 423  *
 424  * Add a watchpoint from a symbol name
 425  */
 426 void    break_add_watch_from_id(const char *name)
 427 {
 428     struct dbg_lvalue    lvalue;
 429
 430     switch (symbol_get_lvalue(name, -1, &lvalue, TRUE))
 431     {
 432     case sglv_found:
 433         break_add_watch(&lvalue, 1);
 434         break;
 435     case sglv_unknown:
 436         dbg_printf("Unable to add watchpoint\n");
 437         break;
 438     case sglv_aborted: /* user aborted symbol lookup */
 439         break;
 440     }
 441 }
 442
 443 /***********************************************************************
 444  *           break_delete_xpoint
 445  *
 446  * Delete a breakpoint.
 447  */
 448 void break_delete_xpoint(int num)
 449 {
 450     struct dbg_breakpoint*      bp = dbg_curr_process->bp;
 451
 452     if ((num <= 0) || (num >= dbg_curr_process->next_bp) ||
 453         bp[num].refcount == 0)
 454     {
 455         dbg_printf("Invalid breakpoint number %d\n", num);
 456         return;
 457     }
 458
 459     if (--bp[num].refcount > 0)
 460         return;
 461
 462     if (bp[num].condition != NULL)
 463     {
 464         expr_free(bp[num].condition);
 465         bp[num].condition = NULL;
 466     }
 467
 468     bp[num].enabled = FALSE;
 469     bp[num].refcount = 0;
 470     bp[num].skipcount = 0;
 471 }
 472
 473 static inline BOOL module_is_container(const IMAGEHLP_MODULE* wmod_cntnr,
 474                                      const IMAGEHLP_MODULE* wmod_child)
 475 {
 476     return wmod_cntnr->BaseOfImage <= wmod_child->BaseOfImage &&
 477         (DWORD)wmod_cntnr->BaseOfImage + wmod_cntnr->ImageSize >=
 478         (DWORD)wmod_child->BaseOfImage + wmod_child->ImageSize;
 479 }
 480
 481 /******************************************************************
 482  *              break_delete_xpoints_from_module
 483  *
 484  * Remove all Xpoints from module which base is 'base'
 485  */
 486 void break_delete_xpoints_from_module(unsigned long base)
 487 {
 488     IMAGEHLP_MODULE             im, im_elf;
 489     int                         i;
 490     DWORD                       linear;
 491     struct dbg_breakpoint*      bp = dbg_curr_process->bp;
 492
 493     /* FIXME: should do it also on the ELF sibbling if any */
 494     im.SizeOfStruct = sizeof(im);
 495     im_elf.SizeOfStruct = sizeof(im_elf);
 496     if (!SymGetModuleInfo(dbg_curr_process->handle, base, &im)) return;
 497
 498     /* try to get in fact the underlying ELF module (if any) */
 499     if (SymGetModuleInfo(dbg_curr_process->handle, im.BaseOfImage - 1, &im_elf) &&
 500         im_elf.BaseOfImage <= im.BaseOfImage &&
 501         (DWORD)im_elf.BaseOfImage + im_elf.ImageSize >= (DWORD)im.BaseOfImage + im.ImageSize)
 502         im = im_elf;
 503
 504     for (i = 0; i < dbg_curr_process->next_bp; i++)
 505     {
 506         linear = (DWORD)memory_to_linear_addr(&bp[i].addr);
 507         if (bp[i].refcount && bp[i].enabled &&
 508             im.BaseOfImage <= linear && linear < im.BaseOfImage + im.ImageSize)
 509         {
 510             break_delete_xpoint(i);
 511         }
 512     }
 513 }
 514
 515 /***********************************************************************
 516  *           break_enable_xpoint
 517  *
 518  * Enable or disable a break point.
 519  */
 520 void break_enable_xpoint(int num, BOOL enable)
 521 {
 522     if ((num <= 0) || (num >= dbg_curr_process->next_bp) ||
 523         dbg_curr_process->bp[num].refcount == 0)
 524     {
 525         dbg_printf("Invalid breakpoint number %d\n", num);
 526         return;
 527     }
 528     dbg_curr_process->bp[num].enabled = (enable) ? TRUE : FALSE;
 529     dbg_curr_process->bp[num].skipcount = 0;
 530 }
 531
 532
 533 /***********************************************************************
 534  *           find_triggered_watch
 535  *
 536  * Lookup the watchpoints to see if one has been triggered
 537  * Return >= (watch point index) if one is found and *oldval is set to
 538  *      the value watched before the TRAP
 539  * Return -1 if none found (*oldval is undetermined)
 540  *
 541  * Unfortunately, Linux does *NOT* (A REAL PITA) report with ptrace
 542  * the DR6 register value, so we have to look with our own need the
 543  * cause of the TRAP.
 544  * -EP
 545  */
 546 static int find_triggered_watch(LPDWORD oldval)
 547 {
 548     int                         found = -1;
 549     int                         i;
 550     struct dbg_breakpoint*      bp = dbg_curr_process->bp;
 551
 552     /* Method 1 => get triggered watchpoint from context (doesn't work on Linux
 553      * 2.2.x). This should be fixed in >= 2.2.16
 554      */
 555     for (i = 0; i < dbg_curr_process->next_bp; i++)
 556     {
 557         DWORD val = 0;
 558
 559         if (bp[i].refcount && bp[i].enabled && !is_xpoint_break(i) &&
 560             (be_cpu->is_watchpoint_set(&dbg_context, bp[i].info)))
 561         {
 562             be_cpu->clear_watchpoint(&dbg_context, bp[i].info);
 563
 564             *oldval = bp[i].w.oldval;
 565             if (get_watched_value(i, &val))
 566             {
 567                 bp[i].w.oldval = val;
 568                 return i;
 569             }
 570         }
 571     }
 572
 573     /* Method 1 failed, trying method 2 */
 574
 575     /* Method 2 => check if value has changed among registered watchpoints
 576      * this really sucks, but this is how gdb 4.18 works on my linux box
 577      * -EP
 578      */
 579     for (i = 0; i < dbg_curr_process->next_bp; i++)
 580     {
 581         DWORD val = 0;
 582
 583         if (bp[i].refcount && bp[i].enabled && !is_xpoint_break(i) &&
 584             get_watched_value(i, &val))
 585         {
 586             *oldval = bp[i].w.oldval;
 587             if (val != *oldval)
 588             {
 589                 be_cpu->clear_watchpoint(&dbg_context, bp[i].info);
 590                 bp[i].w.oldval = val;
 591                 found = i;
 592                 /* cannot break, because two watch points may have been triggered on
 593                  * the same access
 594                  * only one will be reported to the user (FIXME ?)
 595                  */
 596             }
 597         }
 598     }
 599     return found;
 600 }
 601
 602 /***********************************************************************
 603  *           break_info
 604  *
 605  * Display break & watch points information.
 606  */
 607 void break_info(void)
 608 {
 609     int                         i;
 610     int                         nbp = 0, nwp = 0;
 611     struct dbg_delayed_bp*      dbp = dbg_curr_process->delayed_bp;
 612     struct dbg_breakpoint*      bp = dbg_curr_process->bp;
 613
 614     for (i = 1; i < dbg_curr_process->next_bp; i++)
 615     {
 616         if (bp[i].refcount)
 617         {
 618             if (is_xpoint_break(i)) nbp++; else nwp++;
 619         }
 620     }
 621
 622     if (nbp)
 623     {
 624         dbg_printf("Breakpoints:\n");
 625         for (i = 1; i < dbg_curr_process->next_bp; i++)
 626         {
 627             if (!bp[i].refcount || !is_xpoint_break(i))
 628                 continue;
 629             dbg_printf("%d: %c ", i, bp[i].enabled ? 'y' : 'n');
 630             print_address(&bp[i].addr, TRUE);
 631             dbg_printf(" (%u)%s\n", bp[i].refcount,
 632                        bp[i].xpoint_type == be_xpoint_watch_exec ? " (hardware assisted)" : "");
 633             if (bp[i].condition != NULL)
 634             {
 635                 dbg_printf("\t\tstop when  ");
 636                 expr_print(bp[i].condition);
 637                 dbg_printf("\n");
 638             }
 639         }
 640     }
 641     else dbg_printf("No breakpoints\n");
 642     if (nwp)
 643     {
 644         dbg_printf("Watchpoints:\n");
 645         for (i = 1; i < dbg_curr_process->next_bp; i++)
 646         {
 647             if (!bp[i].refcount || is_xpoint_break(i))
 648                 continue;
 649             dbg_printf("%d: %c ", i, bp[i].enabled ? 'y' : 'n');
 650             print_address(&bp[i].addr, TRUE);
 651             dbg_printf(" on %d byte%s (%c)\n",
 652                        bp[i].w.len + 1, bp[i].w.len > 0 ? "s" : "",
 653                        bp[i].xpoint_type == be_xpoint_watch_write ? 'W' : 'R');
 654             if (bp[i].condition != NULL)
 655             {
 656                 dbg_printf("\t\tstop when ");
 657                 expr_print(bp[i].condition);
 658                 dbg_printf("\n");
 659             }
 660         }
 661     }
 662     else dbg_printf("No watchpoints\n");
 663     if (dbg_curr_process->num_delayed_bp)
 664     {
 665         dbg_printf("Delayed breakpoints:\n");
 666         for (i = 0; i < dbg_curr_process->num_delayed_bp; i++)
 667         {
 668             if (dbp[i].is_symbol)
 669             {
 670                 dbg_printf("%d: %s", i, dbp[i].u.symbol.name);
 671                 if (dbp[i].u.symbol.lineno != -1)
 672                     dbg_printf(" at line %u", dbp[i].u.symbol.lineno);
 673             }
 674             else
 675             {
 676                 dbg_printf("%d: ", i);
 677                 print_address(&dbp[i].u.addr, FALSE);
 678             }
 679             dbg_printf("\n");
 680         }
 681     }
 682 }
 683
 684 /***********************************************************************
 685  *           should_stop
 686  *
 687  * Check whether or not the condition (bp / skipcount) of a break/watch
 688  * point are met.
 689  */
 690 static  BOOL should_stop(int bpnum)
 691 {
 692     struct dbg_breakpoint*      bp = &dbg_curr_process->bp[bpnum];
 693
 694     if (bp->condition != NULL)
 695     {
 696         struct dbg_lvalue lvalue = expr_eval(bp->condition);
 697
 698         if (lvalue.type.id == dbg_itype_none)
 699         {
 700             /*
 701              * Something wrong - unable to evaluate this expression.
 702              */
 703             dbg_printf("Unable to evaluate expression ");
 704             expr_print(bp->condition);
 705             dbg_printf("\nTurning off condition\n");
 706             break_add_condition(bpnum, NULL);
 707         }
 708         else if (!types_extract_as_integer(&lvalue))
 709         {
 710             return FALSE;
 711         }
 712     }
 713
 714     if (bp->skipcount > 0) bp->skipcount--;
 715     return bp->skipcount == 0;
 716 }
 717
 718 /***********************************************************************
 719  *           break_should_continue
 720  *
 721  * Determine if we should continue execution after a SIGTRAP signal when
 722  * executing in the given mode.
 723  */
 724 BOOL break_should_continue(ADDRESS* addr, DWORD code, int* count, BOOL* is_break)
 725 {
 726     DWORD               oldval = 0;
 727     enum dbg_exec_mode  mode = dbg_curr_thread->exec_mode;
 728
 729     *is_break = FALSE;
 730     /* If not single-stepping, back up to the break instruction */
 731     if (code == EXCEPTION_BREAKPOINT)
 732         addr->Offset += be_cpu->adjust_pc_for_break(&dbg_context, TRUE);
 733
 734     dbg_curr_process->bp[0].enabled = FALSE;  /* disable the step-over breakpoint */
 735
 736     dbg_curr_thread->stopped_xpoint = find_xpoint(addr, be_xpoint_break);
 737     if (dbg_curr_thread->stopped_xpoint > 0)
 738     {
 739         if (!should_stop(dbg_curr_thread->stopped_xpoint)) return TRUE;
 740
 741         dbg_printf("Stopped on breakpoint %d at ", dbg_curr_thread->stopped_xpoint);
 742         print_address(&dbg_curr_process->bp[dbg_curr_thread->stopped_xpoint].addr, TRUE);
 743         dbg_printf("\n");
 744         return FALSE;
 745     }
 746
 747     dbg_curr_thread->stopped_xpoint = find_xpoint(addr, be_xpoint_watch_exec);
 748     if (dbg_curr_thread->stopped_xpoint > 0)
 749     {
 750         /* If not single-stepping, do not back up over the break instruction */
 751         if (code == EXCEPTION_BREAKPOINT)
 752             addr->Offset += be_cpu->adjust_pc_for_break(&dbg_context, FALSE);
 753
 754         if (!should_stop(dbg_curr_thread->stopped_xpoint)) return TRUE;
 755
 756         dbg_printf("Stopped on breakpoint %d at ", dbg_curr_thread->stopped_xpoint);
 757         print_address(&dbg_curr_process->bp[dbg_curr_thread->stopped_xpoint].addr, TRUE);
 758         dbg_printf("\n");
 759         return FALSE;
 760     }
 761
 762     dbg_curr_thread->stopped_xpoint = find_triggered_watch(&oldval);
 763     if (dbg_curr_thread->stopped_xpoint > 0)
 764     {
 765         /* If not single-stepping, do not back up over the break instruction */
 766         if (code == EXCEPTION_BREAKPOINT)
 767             addr->Offset += be_cpu->adjust_pc_for_break(&dbg_context, FALSE);
 768
 769         if (!should_stop(dbg_curr_thread->stopped_xpoint)) return TRUE;
 770
 771         dbg_printf("Stopped on watchpoint %d at ", dbg_curr_thread->stopped_xpoint);
 772         print_address(addr, TRUE);
 773         dbg_printf(" values: old=%lu new=%lu\n",
 774                    oldval, dbg_curr_process->bp[dbg_curr_thread->stopped_xpoint].w.oldval);
 775         return FALSE;
 776     }
 777
 778     /*
 779      * If our mode indicates that we are stepping line numbers,
 780      * get the current function, and figure out if we are exactly
 781      * on a line number or not.
 782      */
 783     if (mode == dbg_exec_step_over_line || mode == dbg_exec_step_into_line)
 784     {
 785         if (symbol_get_function_line_status(addr) == dbg_on_a_line_number)
 786         {
 787             (*count)--;
 788         }
 789     }
 790     else if (mode == dbg_exec_step_over_insn || mode == dbg_exec_step_into_insn)
 791     {
 792         (*count)--;
 793     }
 794
 795     if (*count > 0 || mode == dbg_exec_finish)
 796     {
 797         /*
 798          * We still need to execute more instructions.
 799          */
 800         return TRUE;
 801     }
 802
 803     /* If there's no breakpoint and we are not single-stepping, then
 804      * either we must have encountered a break insn in the Windows program
 805      * or someone is trying to stop us
 806      */
 807     if (dbg_curr_thread->stopped_xpoint == -1 && code == EXCEPTION_BREAKPOINT)
 808     {
 809         *is_break = TRUE;
 810         addr->Offset += be_cpu->adjust_pc_for_break(&dbg_context, FALSE);
 811         return FALSE;
 812     }
 813
 814     /* no breakpoint, continue if in continuous mode */
 815     return mode == dbg_exec_cont || mode == dbg_exec_finish;
 816 }
 817
 818 /***********************************************************************
 819  *           break_suspend_execution
 820  *
 821  * Remove all bp before entering the debug loop
 822  */
 823 void    break_suspend_execution(void)
 824 {
 825     break_set_xpoints(FALSE);
 826     dbg_curr_process->bp[0] = dbg_curr_thread->step_over_bp;
 827 }
 828
 829 /***********************************************************************
 830  *           break_restart_execution
 831  *
 832  * Set the bp to the correct state to restart execution
 833  * in the given mode.
 834  */
 835 void break_restart_execution(int count)
 836 {
 837     ADDRESS                     addr;
 838     enum dbg_line_status        status;
 839     enum dbg_exec_mode          mode, ret_mode;
 840     ADDRESS                     callee;
 841     void*                       linear;
 842
 843     memory_get_current_pc(&addr);
 844     linear = memory_to_linear_addr(&addr);
 845
 846     /*
 847      * This is the mode we will be running in after we finish.  We would like
 848      * to be able to modify this in certain cases.
 849      */
 850     ret_mode = mode = dbg_curr_thread->exec_mode;
 851
 852     /* we've stopped on a xpoint (other than step over) */
 853     if (dbg_curr_thread->stopped_xpoint > 0)
 854     {
 855         /*
 856          * If we have set a new value, then save it in the BP number.
 857          */
 858         if (count != 0 && mode == dbg_exec_cont)
 859         {
 860             dbg_curr_process->bp[dbg_curr_thread->stopped_xpoint].skipcount = count;
 861         }
 862         /* If we've stopped on a breakpoint, single step over it (, then run) */
 863         if (is_xpoint_break(dbg_curr_thread->stopped_xpoint))
 864             mode = dbg_exec_step_into_insn;
 865     }
 866     else if (mode == dbg_exec_cont && count > 1)
 867     {
 868         dbg_printf("Not stopped at any breakpoint; argument ignored.\n");
 869     }
 870
 871     if (mode == dbg_exec_finish && be_cpu->is_function_return(linear))
 872     {
 873         mode = ret_mode = dbg_exec_step_into_insn;
 874     }
 875
 876     /*
 877      * See if the function we are stepping into has debug info
 878      * and line numbers.  If not, then we step over it instead.
 879      * FIXME - we need to check for things like thunks or trampolines,
 880      * as the actual function may in fact have debug info.
 881      */
 882     if (be_cpu->is_function_call(linear, &callee))
 883     {
 884         status = symbol_get_function_line_status(&callee);
 885 #if 0
 886         /* FIXME: we need to get the thunk type */
 887         /*
 888          * Anytime we have a trampoline, step over it.
 889          */
 890         if ((mode == EXEC_STEP_OVER || mode == EXEC_STEPI_OVER)
 891             && status == dbg_in_a_thunk)
 892         {
 893             WINE_WARN("Not stepping into trampoline at %p (no lines)\n",
 894                       memory_to_linear_addr(&callee));
 895             mode = EXEC_STEP_OVER_TRAMPOLINE;
 896         }
 897 #endif
 898         if (mode == dbg_exec_step_into_line && status == dbg_no_line_info)
 899         {
 900             WINE_WARN("Not stepping into function at %p (no lines)\n",
 901                       memory_to_linear_addr(&callee));
 902             mode = dbg_exec_step_over_line;
 903         }
 904     }
 905
 906     if (mode == dbg_exec_step_into_line &&
 907         symbol_get_function_line_status(&addr) == dbg_no_line_info)
 908     {
 909         dbg_printf("Single stepping until exit from function, \n"
 910                    "which has no line number information.\n");
 911         ret_mode = mode = dbg_exec_finish;
 912     }
 913
 914     switch (mode)
 915     {
 916     case dbg_exec_cont: /* Continuous execution */
 917         be_cpu->single_step(&dbg_context, FALSE);
 918         break_set_xpoints(TRUE);
 919         break;
 920
 921 #if 0
 922     case EXEC_STEP_OVER_TRAMPOLINE:
 923         /*
 924          * This is the means by which we step over our conversion stubs
 925          * in callfrom*.s and callto*.s.  We dig the appropriate address
 926          * off the stack, and we set the breakpoint there instead of the
 927          * address just after the call.
 928          */
 929         be_cpu->get_addr(dbg_curr_thread->handle, &dbg_context,
 930                          be_cpu_addr_stack, &addr);
 931         /* FIXME: we assume stack grows as on an i386 */
 932         addr.Offset += 2 * sizeof(unsigned int);
 933         dbg_read_memory(memory_to_linear_addr(&addr),
 934                         &addr.Offset, sizeof(addr.Offset));
 935         dbg_curr_process->bp[0].addr = addr;
 936         dbg_curr_process->bp[0].enabled = TRUE;
 937         dbg_curr_process->bp[0].refcount = 1;
 938         dbg_curr_process->bp[0].skipcount = 0;
 939         dbg_curr_process->bp[0].xpoint_type = be_xpoint_break;
 940         dbg_curr_process->bp[0].condition = NULL;
 941         be_cpu->single_step(&dbg_context, FALSE);
 942         break_set_xpoints(TRUE);
 943         break;
 944 #endif
 945
 946     case dbg_exec_finish:
 947     case dbg_exec_step_over_insn:  /* Stepping over a call */
 948     case dbg_exec_step_over_line:  /* Stepping over a call */
 949         if (be_cpu->is_step_over_insn(linear))
 950         {
 951             be_cpu->disasm_one_insn(&addr, FALSE);
 952             dbg_curr_process->bp[0].addr = addr;
 953             dbg_curr_process->bp[0].enabled = TRUE;
 954             dbg_curr_process->bp[0].refcount = 1;
 955             dbg_curr_process->bp[0].skipcount = 0;
 956             dbg_curr_process->bp[0].xpoint_type = be_xpoint_break;
 957             dbg_curr_process->bp[0].condition = NULL;
 958             be_cpu->single_step(&dbg_context, FALSE);
 959             break_set_xpoints(TRUE);
 960             break;
 961         }
 962         /* else fall through to single-stepping */
 963
 964     case dbg_exec_step_into_line: /* Single-stepping a line */
 965     case dbg_exec_step_into_insn: /* Single-stepping an instruction */
 966         be_cpu->single_step(&dbg_context, TRUE);
 967         break;
 968     default: RaiseException(DEBUG_STATUS_INTERNAL_ERROR, 0, 0, NULL);
 969     }
 970     dbg_curr_thread->step_over_bp = dbg_curr_process->bp[0];
 971     dbg_curr_thread->exec_mode = ret_mode;
 972 }
 973
 974 int break_add_condition(int num, struct expr* exp)
 975 {
 976     if (num <= 0 || num >= dbg_curr_process->next_bp ||
 977         !dbg_curr_process->bp[num].refcount)
 978     {
 979         dbg_printf("Invalid breakpoint number %d\n", num);
 980         return FALSE;
 981     }
 982
 983     if (dbg_curr_process->bp[num].condition != NULL)
 984     {
 985         expr_free(dbg_curr_process->bp[num].condition);
 986         dbg_curr_process->bp[num].condition = NULL;
 987     }
 988
 989     if (exp != NULL) dbg_curr_process->bp[num].condition = expr_clone(exp, NULL);
 990
 991     return TRUE;
 992 }