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., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, 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 = 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 ADDRESS64* 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 ADDRESS64* 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, DWORD64* val)
 141 {
 142     DWORD64     buf[1];
 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 8:     *val = *(DWORD64*)buf;  break;
 151     case 4:     *val = *(DWORD*)buf;    break;
 152     case 2:     *val = *(WORD*)buf;     break;
 153     case 1:     *val = *(BYTE*)buf;     break;
 154     default: RaiseException(DEBUG_STATUS_INTERNAL_ERROR, 0, 0, NULL);
 155     }
 156     return TRUE;
 157 }
 158
 159 /***********************************************************************
 160  *           break_add_break
 161  *
 162  * Add a breakpoint.
 163  */
 164 BOOL break_add_break(const ADDRESS64* addr, BOOL verbose, BOOL swbp)
 165 {
 166     int                         num;
 167     BYTE                        ch;
 168     struct dbg_breakpoint*      bp = dbg_curr_process->bp;
 169     int                         type = swbp ? be_xpoint_break : be_xpoint_watch_exec;
 170
 171     if ((num = find_xpoint(addr, type)) >= 1)
 172     {
 173         bp[num].refcount++;
 174         dbg_printf("Breakpoint %d at ", num);
 175         print_address(&bp[num].addr, TRUE);
 176         dbg_printf(" (refcount=%d)\n", bp[num].refcount);
 177         return TRUE;
 178     }
 179
 180     if (!dbg_read_memory(memory_to_linear_addr(addr), &ch, sizeof(ch)))
 181     {
 182         if (verbose)
 183         {
 184             dbg_printf("Invalid address ");
 185             print_bare_address(addr);
 186             dbg_printf(", can't set breakpoint\n");
 187         }
 188         return FALSE;
 189     }
 190
 191     if ((num = init_xpoint(type, addr)) == -1)
 192         return FALSE;
 193
 194     dbg_printf("Breakpoint %d at ", num);
 195     print_address(&bp[num].addr, TRUE);
 196     dbg_printf("\n");
 197
 198     return TRUE;
 199 }
 200
 201 /***********************************************************************
 202  *           break_add_break_from_lvalue
 203  *
 204  * Add a breakpoint.
 205  */
 206 BOOL break_add_break_from_lvalue(const struct dbg_lvalue* lvalue, BOOL swbp)
 207 {
 208     ADDRESS64   addr;
 209
 210     types_extract_as_address(lvalue, &addr);
 211
 212     if (!break_add_break(&addr, TRUE, swbp))
 213     {
 214         if (!DBG_IVAR(CanDeferOnBPByAddr))
 215         {
 216             dbg_printf("Invalid address, can't set breakpoint\n"
 217                        "You can turn on deferring bp by address by setting $CanDeferOnBPByAddr to 1\n");
 218             return FALSE;
 219         }
 220         dbg_printf("Unable to add breakpoint, will check again any time a new DLL is loaded\n");
 221         dbg_curr_process->delayed_bp =
 222             dbg_heap_realloc(dbg_curr_process->delayed_bp,
 223                              sizeof(struct dbg_delayed_bp) * ++dbg_curr_process->num_delayed_bp);
 224
 225         dbg_curr_process->delayed_bp[dbg_curr_process->num_delayed_bp - 1].is_symbol   = FALSE;
 226         dbg_curr_process->delayed_bp[dbg_curr_process->num_delayed_bp - 1].software_bp = swbp;
 227         dbg_curr_process->delayed_bp[dbg_curr_process->num_delayed_bp - 1].u.addr      = addr;
 228         return TRUE;
 229     }
 230     return FALSE;
 231 }
 232
 233 /***********************************************************************
 234  *           break_add_break_from_id
 235  *
 236  * Add a breakpoint from a function name (and eventually a line #)
 237  */
 238 void    break_add_break_from_id(const char *name, int lineno, BOOL swbp)
 239 {
 240     struct dbg_lvalue   lvalue;
 241     int                 i;
 242
 243     switch (symbol_get_lvalue(name, lineno, &lvalue, TRUE))
 244     {
 245     case sglv_found:
 246         break_add_break(&lvalue.addr, TRUE, swbp);
 247         return;
 248     case sglv_unknown:
 249         break;
 250     case sglv_aborted: /* user aborted symbol lookup */
 251         return;
 252     }
 253
 254     dbg_printf("Unable to add breakpoint, will check again when a new DLL is loaded\n");
 255     for (i = 0; i < dbg_curr_process->num_delayed_bp; i++)
 256     {
 257         if (dbg_curr_process->delayed_bp[i].is_symbol &&
 258             !strcmp(name, dbg_curr_process->delayed_bp[i].u.symbol.name) &&
 259             lineno == dbg_curr_process->delayed_bp[i].u.symbol.lineno)
 260             return;
 261     }
 262     dbg_curr_process->delayed_bp = dbg_heap_realloc(dbg_curr_process->delayed_bp,
 263                                                     sizeof(struct dbg_delayed_bp) * ++dbg_curr_process->num_delayed_bp);
 264
 265     dbg_curr_process->delayed_bp[dbg_curr_process->num_delayed_bp - 1].is_symbol       = TRUE;
 266     dbg_curr_process->delayed_bp[dbg_curr_process->num_delayed_bp - 1].software_bp     = swbp;
 267     dbg_curr_process->delayed_bp[dbg_curr_process->num_delayed_bp - 1].u.symbol.name   = strcpy(HeapAlloc(GetProcessHeap(), 0, strlen(name) + 1), name);
 268     dbg_curr_process->delayed_bp[dbg_curr_process->num_delayed_bp - 1].u.symbol.lineno = lineno;
 269 }
 270
 271 struct cb_break_lineno
 272 {
 273     int         lineno;
 274     ADDRESS64   addr;
 275 };
 276
 277 static BOOL CALLBACK line_cb(SRCCODEINFO* sci, void* user)
 278 {
 279     struct cb_break_lineno*      bkln = user;
 280
 281     if (bkln->lineno == sci->LineNumber)
 282     {
 283         bkln->addr.Mode = AddrModeFlat;
 284         bkln->addr.Offset = sci->Address;
 285         return FALSE;
 286     }
 287     return TRUE;
 288 }
 289
 290 /***********************************************************************
 291  *           break_add_break_from_lineno
 292  *
 293  * Add a breakpoint from a line number in current file
 294  */
 295 void    break_add_break_from_lineno(int lineno, BOOL swbp)
 296 {
 297     struct cb_break_lineno      bkln;
 298
 299     memory_get_current_pc(&bkln.addr);
 300
 301     if (lineno != -1)
 302     {
 303         IMAGEHLP_LINE64 il;
 304
 305
 306         DWORD           disp;
 307         DWORD_PTR       linear = (DWORD_PTR)memory_to_linear_addr(&bkln.addr);
 308
 309         il.SizeOfStruct = sizeof(il);
 310         if (!SymGetLineFromAddr64(dbg_curr_process->handle, linear, &disp, &il))
 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     char                        hexbuf[MAX_OFFSET_TO_STR_LEN];
 340
 341     for (i = 0; i < dbg_curr_process->num_delayed_bp; i++)
 342     {
 343         if (dbp[i].is_symbol)
 344         {
 345             if (symbol_get_lvalue(dbp[i].u.symbol.name, dbp[i].u.symbol.lineno,
 346                                   &lvalue, TRUE) != sglv_found)
 347                 continue;
 348             if (lvalue.cookie != DLV_TARGET) continue;
 349         }
 350         else
 351             lvalue.addr = dbp[i].u.addr;
 352         WINE_TRACE("trying to add delayed %s-bp\n", dbp[i].is_symbol ? "S" : "A");
 353         if (!dbp[i].is_symbol)
 354             WINE_TRACE("\t%04x:%s\n",
 355                        dbp[i].u.addr.Segment,
 356                        memory_offset_to_string(hexbuf, dbp[i].u.addr.Offset, 0));
 357         else
 358             WINE_TRACE("\t'%s' @ %d\n",
 359                        dbp[i].u.symbol.name, dbp[i].u.symbol.lineno);
 360
 361         if (break_add_break(&lvalue.addr, FALSE, dbp[i].software_bp))
 362             memmove(&dbp[i], &dbp[i+1], (--dbg_curr_process->num_delayed_bp - i) * sizeof(*dbp));
 363     }
 364 }
 365
 366 /***********************************************************************
 367  *           break_add_watch
 368  *
 369  * Add a watchpoint.
 370  */
 371 static void break_add_watch(const struct dbg_lvalue* lvalue, BOOL is_write)
 372 {
 373     int         num;
 374     DWORD64     l = 4;
 375
 376     if (lvalue->cookie == DLV_HOST)
 377     {
 378         dbg_printf("Cannot set a watch point on register or register-based variable\n");
 379         return;
 380     }
 381     num = init_xpoint((is_write) ? be_xpoint_watch_write : be_xpoint_watch_read,
 382                       &lvalue->addr);
 383     if (num == -1) return;
 384
 385     if (lvalue->type.id != dbg_itype_none)
 386     {
 387         if (types_get_info(&lvalue->type, TI_GET_LENGTH, &l))
 388         {
 389             switch (l)
 390             {
 391             case 4: case 2: case 1: break;
 392             default:
 393                 dbg_printf("Unsupported length (%s) for watch-points, defaulting to 4\n",
 394                            wine_dbgstr_longlong(l));
 395                 break;
 396             }
 397         }
 398         else dbg_printf("Cannot get watch size, defaulting to 4\n");
 399     }
 400     dbg_curr_process->bp[num].w.len = (DWORD)l - 1;
 401
 402     if (!get_watched_value(num, &dbg_curr_process->bp[num].w.oldval))
 403     {
 404         dbg_printf("Bad address. Watchpoint not set\n");
 405         dbg_curr_process->bp[num].refcount = 0;
 406         return;
 407     }
 408     dbg_printf("Watchpoint %d at ", num);
 409     print_address(&dbg_curr_process->bp[num].addr, TRUE);
 410     dbg_printf("\n");
 411 }
 412
 413 /******************************************************************
 414  *              break_add_watch_from_lvalue
 415  *
 416  * Adds a watch point from an address (stored in a lvalue)
 417  */
 418 void break_add_watch_from_lvalue(const struct dbg_lvalue* lvalue)
 419 {
 420     struct dbg_lvalue   lval;
 421
 422     types_extract_as_address(lvalue, &lval.addr);
 423     lval.type.id = dbg_itype_none;
 424
 425     break_add_watch(&lval, TRUE);
 426 }
 427
 428 /***********************************************************************
 429  *           break_add_watch_from_id
 430  *
 431  * Add a watchpoint from a symbol name
 432  */
 433 void    break_add_watch_from_id(const char *name)
 434 {
 435     struct dbg_lvalue    lvalue;
 436
 437     switch (symbol_get_lvalue(name, -1, &lvalue, TRUE))
 438     {
 439     case sglv_found:
 440         break_add_watch(&lvalue, 1);
 441         break;
 442     case sglv_unknown:
 443         dbg_printf("Unable to add watchpoint\n");
 444         break;
 445     case sglv_aborted: /* user aborted symbol lookup */
 446         break;
 447     }
 448 }
 449
 450 /***********************************************************************
 451  *           break_delete_xpoint
 452  *
 453  * Delete a breakpoint.
 454  */
 455 void break_delete_xpoint(int num)
 456 {
 457     struct dbg_breakpoint*      bp = dbg_curr_process->bp;
 458
 459     if ((num <= 0) || (num >= dbg_curr_process->next_bp) ||
 460         bp[num].refcount == 0)
 461     {
 462         dbg_printf("Invalid breakpoint number %d\n", num);
 463         return;
 464     }
 465
 466     if (--bp[num].refcount > 0)
 467         return;
 468
 469     if (bp[num].condition != NULL)
 470     {
 471         expr_free(bp[num].condition);
 472         bp[num].condition = NULL;
 473     }
 474
 475     bp[num].enabled = FALSE;
 476     bp[num].refcount = 0;
 477     bp[num].skipcount = 0;
 478 }
 479
 480 static inline BOOL module_is_container(const IMAGEHLP_MODULE* wmod_cntnr,
 481                                      const IMAGEHLP_MODULE* wmod_child)
 482 {
 483     return wmod_cntnr->BaseOfImage <= wmod_child->BaseOfImage &&
 484         wmod_cntnr->BaseOfImage + wmod_cntnr->ImageSize >=
 485         wmod_child->BaseOfImage + wmod_child->ImageSize;
 486 }
 487
 488 /******************************************************************
 489  *              break_delete_xpoints_from_module
 490  *
 491  * Remove all Xpoints from module which base is 'base'
 492  */
 493 void break_delete_xpoints_from_module(DWORD64 base)
 494 {
 495     IMAGEHLP_MODULE64           im, im_elf;
 496     int                         i;
 497     DWORD_PTR                   linear;
 498     struct dbg_breakpoint*      bp = dbg_curr_process->bp;
 499
 500     /* FIXME: should do it also on the ELF sibbling if any */
 501     im.SizeOfStruct = sizeof(im);
 502     im_elf.SizeOfStruct = sizeof(im_elf);
 503     if (!SymGetModuleInfo64(dbg_curr_process->handle, base, &im)) return;
 504
 505     /* try to get in fact the underlying ELF module (if any) */
 506     if (SymGetModuleInfo64(dbg_curr_process->handle, im.BaseOfImage - 1, &im_elf) &&
 507         im_elf.BaseOfImage <= im.BaseOfImage &&
 508         im_elf.BaseOfImage + im_elf.ImageSize >= im.BaseOfImage + im.ImageSize)
 509         im = im_elf;
 510
 511     for (i = 0; i < dbg_curr_process->next_bp; i++)
 512     {
 513         linear = (DWORD_PTR)memory_to_linear_addr(&bp[i].addr);
 514         if (bp[i].refcount && bp[i].enabled &&
 515             im.BaseOfImage <= linear && linear < im.BaseOfImage + im.ImageSize)
 516         {
 517             break_delete_xpoint(i);
 518         }
 519     }
 520 }
 521
 522 /***********************************************************************
 523  *           break_enable_xpoint
 524  *
 525  * Enable or disable a break point.
 526  */
 527 void break_enable_xpoint(int num, BOOL enable)
 528 {
 529     if ((num <= 0) || (num >= dbg_curr_process->next_bp) ||
 530         dbg_curr_process->bp[num].refcount == 0)
 531     {
 532         dbg_printf("Invalid breakpoint number %d\n", num);
 533         return;
 534     }
 535     dbg_curr_process->bp[num].enabled = (enable) ? TRUE : FALSE;
 536     dbg_curr_process->bp[num].skipcount = 0;
 537 }
 538
 539
 540 /***********************************************************************
 541  *           find_triggered_watch
 542  *
 543  * Lookup the watchpoints to see if one has been triggered
 544  * Return >= (watch point index) if one is found
 545  * Return -1 if none found
 546  *
 547  * Unfortunately, Linux used to *NOT* (A REAL PITA) report with ptrace
 548  * the DR6 register value, so we have to look with our own need the
 549  * cause of the TRAP.
 550  * -EP
 551  */
 552 static int find_triggered_watch(void)
 553 {
 554     int                         found = -1;
 555     int                         i;
 556     struct dbg_breakpoint*      bp = dbg_curr_process->bp;
 557
 558     /* Method 1 => get triggered watchpoint from context (doesn't work on Linux
 559      * 2.2.x). This should be fixed in >= 2.2.16
 560      */
 561     for (i = 0; i < dbg_curr_process->next_bp; i++)
 562     {
 563         DWORD64 val = 0;
 564
 565         if (bp[i].refcount && bp[i].enabled && !is_xpoint_break(i) &&
 566             (be_cpu->is_watchpoint_set(&dbg_context, bp[i].info)))
 567         {
 568             be_cpu->clear_watchpoint(&dbg_context, bp[i].info);
 569
 570             if (get_watched_value(i, &val))
 571             {
 572                 bp[i].w.oldval = val;
 573                 return i;
 574             }
 575         }
 576     }
 577
 578     /* Method 1 failed, trying method 2 */
 579
 580     /* Method 2 => check if value has changed among registered watchpoints
 581      * this really sucks, but this is how gdb 4.18 works on my linux box
 582      * -EP
 583      */
 584     for (i = 0; i < dbg_curr_process->next_bp; i++)
 585     {
 586         DWORD64 val = 0;
 587
 588         if (bp[i].refcount && bp[i].enabled && !is_xpoint_break(i) &&
 589             get_watched_value(i, &val))
 590         {
 591             if (val != bp[i].w.oldval)
 592             {
 593                 be_cpu->clear_watchpoint(&dbg_context, bp[i].info);
 594                 bp[i].w.oldval = val;
 595                 found = i;
 596                 /* cannot break, because two watch points may have been triggered on
 597                  * the same access
 598                  * only one will be reported to the user (FIXME ?)
 599                  */
 600             }
 601         }
 602     }
 603     return found;
 604 }
 605
 606 /***********************************************************************
 607  *           break_info
 608  *
 609  * Display break & watch points information.
 610  */
 611 void break_info(void)
 612 {
 613     int                         i;
 614     int                         nbp = 0, nwp = 0;
 615     struct dbg_delayed_bp*      dbp = dbg_curr_process->delayed_bp;
 616     struct dbg_breakpoint*      bp = dbg_curr_process->bp;
 617
 618     for (i = 1; i < dbg_curr_process->next_bp; i++)
 619     {
 620         if (bp[i].refcount)
 621         {
 622             if (is_xpoint_break(i)) nbp++; else nwp++;
 623         }
 624     }
 625
 626     if (nbp)
 627     {
 628         dbg_printf("Breakpoints:\n");
 629         for (i = 1; i < dbg_curr_process->next_bp; i++)
 630         {
 631             if (!bp[i].refcount || !is_xpoint_break(i))
 632                 continue;
 633             dbg_printf("%d: %c ", i, bp[i].enabled ? 'y' : 'n');
 634             print_address(&bp[i].addr, TRUE);
 635             dbg_printf(" (%u)%s\n", bp[i].refcount,
 636                        bp[i].xpoint_type == be_xpoint_watch_exec ? " (hardware assisted)" : "");
 637             if (bp[i].condition != NULL)
 638             {
 639                 dbg_printf("\t\tstop when  ");
 640                 expr_print(bp[i].condition);
 641                 dbg_printf("\n");
 642             }
 643         }
 644     }
 645     else dbg_printf("No breakpoints\n");
 646     if (nwp)
 647     {
 648         dbg_printf("Watchpoints:\n");
 649         for (i = 1; i < dbg_curr_process->next_bp; i++)
 650         {
 651             if (!bp[i].refcount || is_xpoint_break(i))
 652                 continue;
 653             dbg_printf("%d: %c ", i, bp[i].enabled ? 'y' : 'n');
 654             print_address(&bp[i].addr, TRUE);
 655             dbg_printf(" on %d byte%s (%c)\n",
 656                        bp[i].w.len + 1, bp[i].w.len > 0 ? "s" : "",
 657                        bp[i].xpoint_type == be_xpoint_watch_write ? 'W' : 'R');
 658             if (bp[i].condition != NULL)
 659             {
 660                 dbg_printf("\t\tstop when ");
 661                 expr_print(bp[i].condition);
 662                 dbg_printf("\n");
 663             }
 664         }
 665     }
 666     else dbg_printf("No watchpoints\n");
 667     if (dbg_curr_process->num_delayed_bp)
 668     {
 669         dbg_printf("Delayed breakpoints:\n");
 670         for (i = 0; i < dbg_curr_process->num_delayed_bp; i++)
 671         {
 672             if (dbp[i].is_symbol)
 673             {
 674                 dbg_printf("%d: %s", i, dbp[i].u.symbol.name);
 675                 if (dbp[i].u.symbol.lineno != -1)
 676                     dbg_printf(" at line %u", dbp[i].u.symbol.lineno);
 677             }
 678             else
 679             {
 680                 dbg_printf("%d: ", i);
 681                 print_address(&dbp[i].u.addr, FALSE);
 682             }
 683             dbg_printf("\n");
 684         }
 685     }
 686 }
 687
 688 /***********************************************************************
 689  *           should_stop
 690  *
 691  * Check whether or not the condition (bp / skipcount) of a break/watch
 692  * point are met.
 693  */
 694 static  BOOL should_stop(int bpnum)
 695 {
 696     struct dbg_breakpoint*      bp = &dbg_curr_process->bp[bpnum];
 697
 698     if (bp->condition != NULL)
 699     {
 700         struct dbg_lvalue lvalue = expr_eval(bp->condition);
 701
 702         if (lvalue.type.id == dbg_itype_none)
 703         {
 704             /*
 705              * Something wrong - unable to evaluate this expression.
 706              */
 707             dbg_printf("Unable to evaluate expression ");
 708             expr_print(bp->condition);
 709             dbg_printf("\nTurning off condition\n");
 710             break_add_condition(bpnum, NULL);
 711         }
 712         else if (!types_extract_as_integer(&lvalue))
 713         {
 714             return FALSE;
 715         }
 716     }
 717
 718     if (bp->skipcount > 0) bp->skipcount--;
 719     return bp->skipcount == 0;
 720 }
 721
 722 /***********************************************************************
 723  *           break_should_continue
 724  *
 725  * Determine if we should continue execution after a SIGTRAP signal when
 726  * executing in the given mode.
 727  */
 728 BOOL break_should_continue(ADDRESS64* addr, DWORD code)
 729 {
 730     enum dbg_exec_mode  mode = dbg_curr_thread->exec_mode;
 731
 732
 733     if (dbg_curr_thread->stopped_xpoint > 0)
 734     {
 735         if (!should_stop(dbg_curr_thread->stopped_xpoint)) return TRUE;
 736
 737         switch (dbg_curr_process->bp[dbg_curr_thread->stopped_xpoint].xpoint_type)
 738         {
 739         case be_xpoint_break:
 740         case be_xpoint_watch_exec:
 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             break;
 745         case be_xpoint_watch_read:
 746         case be_xpoint_watch_write:
 747             dbg_printf("Stopped on watchpoint %d at ", dbg_curr_thread->stopped_xpoint);
 748             print_address(addr, TRUE);
 749             dbg_printf(" new value %s\n",
 750                        wine_dbgstr_longlong(dbg_curr_process->bp[dbg_curr_thread->stopped_xpoint].w.oldval));
 751         }
 752         return FALSE;
 753     }
 754
 755     /*
 756      * If our mode indicates that we are stepping line numbers,
 757      * get the current function, and figure out if we are exactly
 758      * on a line number or not.
 759      */
 760     if (mode == dbg_exec_step_over_line || mode == dbg_exec_step_into_line)
 761     {
 762         if (symbol_get_function_line_status(addr) == dbg_on_a_line_number)
 763             dbg_curr_thread->exec_count--;
 764     }
 765     else if (mode == dbg_exec_step_over_insn || mode == dbg_exec_step_into_insn)
 766         dbg_curr_thread->exec_count--;
 767
 768     if (dbg_curr_thread->exec_count > 0 || mode == dbg_exec_finish)
 769     {
 770         /*
 771          * We still need to execute more instructions.
 772          */
 773         return TRUE;
 774     }
 775
 776     /* no breakpoint, continue if in continuous mode */
 777     return mode == dbg_exec_cont || mode == dbg_exec_finish;
 778 }
 779
 780 /***********************************************************************
 781  *           break_adjust_pc
 782  *
 783  * Adjust PC to the address where the trap (if any) actually occurred
 784  * Also sets dbg_curr_thread->stopped_xpoint
 785  */
 786 void break_adjust_pc(ADDRESS64* addr, DWORD code, BOOL first_chance, BOOL* is_break)
 787 {
 788     /* break / watch points are handled on first chance */
 789     if ( !first_chance )
 790     {
 791         *is_break = TRUE;
 792         dbg_curr_thread->stopped_xpoint = -1;
 793         return;
 794     }
 795     *is_break = FALSE;
 796
 797     /* If not single-stepping, back up to the break instruction */
 798     if (code == EXCEPTION_BREAKPOINT)
 799         addr->Offset += be_cpu->adjust_pc_for_break(&dbg_context, TRUE);
 800
 801     dbg_curr_thread->stopped_xpoint = find_xpoint(addr, be_xpoint_break);
 802     dbg_curr_process->bp[0].enabled = FALSE;  /* disable the step-over breakpoint */
 803
 804     if (dbg_curr_thread->stopped_xpoint > 0) return;
 805
 806     if (dbg_curr_thread->stopped_xpoint < 0)
 807     {
 808         dbg_curr_thread->stopped_xpoint = find_xpoint(addr, be_xpoint_watch_exec);
 809         if (dbg_curr_thread->stopped_xpoint < 0)
 810             dbg_curr_thread->stopped_xpoint = find_triggered_watch();
 811         if (dbg_curr_thread->stopped_xpoint > 0)
 812         {
 813             /* If not single-stepping, do not back up over the break instruction */
 814             if (code == EXCEPTION_BREAKPOINT)
 815                 addr->Offset += be_cpu->adjust_pc_for_break(&dbg_context, FALSE);
 816             return;
 817         }
 818     }
 819
 820     /* If there's no breakpoint and we are not single-stepping, then
 821      * either we must have encountered a break insn in the Windows program
 822      * or someone is trying to stop us
 823      */
 824     if (dbg_curr_thread->stopped_xpoint == -1 && code == EXCEPTION_BREAKPOINT)
 825     {
 826         *is_break = TRUE;
 827         addr->Offset += be_cpu->adjust_pc_for_break(&dbg_context, FALSE);
 828     }
 829 }
 830
 831 /***********************************************************************
 832  *           break_suspend_execution
 833  *
 834  * Remove all bp before entering the debug loop
 835  */
 836 void    break_suspend_execution(void)
 837 {
 838     break_set_xpoints(FALSE);
 839     dbg_curr_process->bp[0] = dbg_curr_thread->step_over_bp;
 840 }
 841
 842 /***********************************************************************
 843  *           break_restart_execution
 844  *
 845  * Set the bp to the correct state to restart execution
 846  * in the given mode.
 847  */
 848 void break_restart_execution(int count)
 849 {
 850     ADDRESS64                   addr;
 851     enum dbg_line_status        status;
 852     enum dbg_exec_mode          mode, ret_mode;
 853     ADDRESS64                   callee;
 854     void*                       linear;
 855
 856     memory_get_current_pc(&addr);
 857     linear = memory_to_linear_addr(&addr);
 858
 859     /*
 860      * This is the mode we will be running in after we finish.  We would like
 861      * to be able to modify this in certain cases.
 862      */
 863     ret_mode = mode = dbg_curr_thread->exec_mode;
 864
 865     /* we've stopped on a xpoint (other than step over) */
 866     if (dbg_curr_thread->stopped_xpoint > 0)
 867     {
 868         /*
 869          * If we have set a new value, then save it in the BP number.
 870          */
 871         if (count != 0 && mode == dbg_exec_cont)
 872         {
 873             dbg_curr_process->bp[dbg_curr_thread->stopped_xpoint].skipcount = count;
 874         }
 875         /* If we've stopped on a breakpoint, single step over it (, then run) */
 876         if (is_xpoint_break(dbg_curr_thread->stopped_xpoint))
 877             mode = dbg_exec_step_into_insn;
 878     }
 879     else if (mode == dbg_exec_cont && count > 1)
 880     {
 881         dbg_printf("Not stopped at any breakpoint; argument ignored.\n");
 882     }
 883
 884     if (mode == dbg_exec_finish && be_cpu->is_function_return(linear))
 885     {
 886         mode = ret_mode = dbg_exec_step_into_insn;
 887     }
 888
 889     /*
 890      * See if the function we are stepping into has debug info
 891      * and line numbers.  If not, then we step over it instead.
 892      * FIXME - we need to check for things like thunks or trampolines,
 893      * as the actual function may in fact have debug info.
 894      */
 895     if (be_cpu->is_function_call(linear, &callee))
 896     {
 897         status = symbol_get_function_line_status(&callee);
 898 #if 0
 899         /* FIXME: we need to get the thunk type */
 900         /*
 901          * Anytime we have a trampoline, step over it.
 902          */
 903         if ((mode == EXEC_STEP_OVER || mode == EXEC_STEPI_OVER)
 904             && status == dbg_in_a_thunk)
 905         {
 906             WINE_WARN("Not stepping into trampoline at %p (no lines)\n",
 907                       memory_to_linear_addr(&callee));
 908             mode = EXEC_STEP_OVER_TRAMPOLINE;
 909         }
 910 #endif
 911         if (mode == dbg_exec_step_into_line && status == dbg_no_line_info)
 912         {
 913             WINE_WARN("Not stepping into function at %p (no lines)\n",
 914                       memory_to_linear_addr(&callee));
 915             mode = dbg_exec_step_over_line;
 916         }
 917     }
 918
 919     if (mode == dbg_exec_step_into_line &&
 920         symbol_get_function_line_status(&addr) == dbg_no_line_info)
 921     {
 922         dbg_printf("Single stepping until exit from function,\n"
 923                    "which has no line number information.\n");
 924         ret_mode = mode = dbg_exec_finish;
 925     }
 926
 927     switch (mode)
 928     {
 929     case dbg_exec_cont: /* Continuous execution */
 930         be_cpu->single_step(&dbg_context, FALSE);
 931         break_set_xpoints(TRUE);
 932         break;
 933
 934 #if 0
 935     case EXEC_STEP_OVER_TRAMPOLINE:
 936         /*
 937          * This is the means by which we step over our conversion stubs
 938          * in callfrom*.s and callto*.s.  We dig the appropriate address
 939          * off the stack, and we set the breakpoint there instead of the
 940          * address just after the call.
 941          */
 942         be_cpu->get_addr(dbg_curr_thread->handle, &dbg_context,
 943                          be_cpu_addr_stack, &addr);
 944         /* FIXME: we assume stack grows as on an i386 */
 945         addr.Offset += 2 * sizeof(unsigned int);
 946         dbg_read_memory(memory_to_linear_addr(&addr),
 947                         &addr.Offset, sizeof(addr.Offset));
 948         dbg_curr_process->bp[0].addr = addr;
 949         dbg_curr_process->bp[0].enabled = TRUE;
 950         dbg_curr_process->bp[0].refcount = 1;
 951         dbg_curr_process->bp[0].skipcount = 0;
 952         dbg_curr_process->bp[0].xpoint_type = be_xpoint_break;
 953         dbg_curr_process->bp[0].condition = NULL;
 954         be_cpu->single_step(&dbg_context, FALSE);
 955         break_set_xpoints(TRUE);
 956         break;
 957 #endif
 958
 959     case dbg_exec_finish:
 960     case dbg_exec_step_over_insn:  /* Stepping over a call */
 961     case dbg_exec_step_over_line:  /* Stepping over a call */
 962         if (be_cpu->is_step_over_insn(linear))
 963         {
 964             be_cpu->disasm_one_insn(&addr, FALSE);
 965             dbg_curr_process->bp[0].addr = addr;
 966             dbg_curr_process->bp[0].enabled = TRUE;
 967             dbg_curr_process->bp[0].refcount = 1;
 968             dbg_curr_process->bp[0].skipcount = 0;
 969             dbg_curr_process->bp[0].xpoint_type = be_xpoint_break;
 970             dbg_curr_process->bp[0].condition = NULL;
 971             be_cpu->single_step(&dbg_context, FALSE);
 972             break_set_xpoints(TRUE);
 973             break;
 974         }
 975         /* else fall through to single-stepping */
 976
 977     case dbg_exec_step_into_line: /* Single-stepping a line */
 978     case dbg_exec_step_into_insn: /* Single-stepping an instruction */
 979         be_cpu->single_step(&dbg_context, TRUE);
 980         break;
 981     default: RaiseException(DEBUG_STATUS_INTERNAL_ERROR, 0, 0, NULL);
 982     }
 983     dbg_curr_thread->step_over_bp = dbg_curr_process->bp[0];
 984     dbg_curr_thread->exec_mode = ret_mode;
 985 }
 986
 987 int break_add_condition(int num, struct expr* exp)
 988 {
 989     if (num <= 0 || num >= dbg_curr_process->next_bp ||
 990         !dbg_curr_process->bp[num].refcount)
 991     {
 992         dbg_printf("Invalid breakpoint number %d\n", num);
 993         return FALSE;
 994     }
 995
 996     if (dbg_curr_process->bp[num].condition != NULL)
 997     {
 998         expr_free(dbg_curr_process->bp[num].condition);
 999         dbg_curr_process->bp[num].condition = NULL;
1000     }
1001
1002     if (exp != NULL) dbg_curr_process->bp[num].condition = expr_clone(exp, NULL);
1003
1004     return TRUE;
1005 }