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

   1 /*
   2  * Debugger memory handling
   3  *
   4  * Copyright 1993 Eric Youngdale
   5  * Copyright 1995 Alexandre Julliard
   6  * Copyright 2000-2004 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 "wine/port.h"
  25
  26 #include <stdlib.h>
  27 #include <string.h>
  28 #include <stdio.h>
  29
  30 #include "debugger.h"
  31 #include "wine/debug.h"
  32
  33 WINE_DEFAULT_DEBUG_CHANNEL(winedbg);
  34
  35 void* be_cpu_linearize(HANDLE hThread, const ADDRESS* addr)
  36 {
  37     assert(addr->Mode == AddrModeFlat);
  38     return (void*)addr->Offset;
  39 }
  40
  41 unsigned be_cpu_build_addr(HANDLE hThread, const CONTEXT* ctx, ADDRESS* addr,
  42                            unsigned seg, unsigned long offset)
  43 {
  44     addr->Mode    = AddrModeFlat;
  45     addr->Segment = 0; /* don't need segment */
  46     addr->Offset  = offset;
  47     return TRUE;
  48 }
  49
  50 void* memory_to_linear_addr(const ADDRESS* addr)
  51 {
  52     return be_cpu->linearize(dbg_curr_thread->handle, addr);
  53 }
  54
  55 BOOL memory_get_current_pc(ADDRESS* addr)
  56 {
  57     assert(be_cpu->get_addr);
  58     return be_cpu->get_addr(dbg_curr_thread->handle, &dbg_context,
  59                             be_cpu_addr_pc, addr);
  60 }
  61
  62 BOOL memory_get_current_stack(ADDRESS* addr)
  63 {
  64     assert(be_cpu->get_addr);
  65     return be_cpu->get_addr(dbg_curr_thread->handle, &dbg_context,
  66                             be_cpu_addr_stack, addr);
  67 }
  68
  69 BOOL memory_get_current_frame(ADDRESS* addr)
  70 {
  71     assert(be_cpu->get_addr);
  72     return be_cpu->get_addr(dbg_curr_thread->handle, &dbg_context,
  73                             be_cpu_addr_frame, addr);
  74 }
  75
  76 static void     memory_report_invalid_addr(const void* addr)
  77 {
  78     ADDRESS     address;
  79
  80     address.Mode    = AddrModeFlat;
  81     address.Segment = 0;
  82     address.Offset  = (unsigned long)addr;
  83     dbg_printf("*** Invalid address ");
  84     print_address(&address, FALSE);
  85     dbg_printf("\n");
  86 }
  87
  88 /***********************************************************************
  89  *           memory_read_value
  90  *
  91  * Read a memory value.
  92  */
  93 BOOL memory_read_value(const struct dbg_lvalue* lvalue, DWORD size, void* result)
  94 {
  95     BOOL ret = FALSE;
  96
  97     if (lvalue->cookie == DLV_TARGET)
  98     {
  99         void*   linear = memory_to_linear_addr(&lvalue->addr);
 100         if (!(ret = dbg_read_memory(linear, result, size)))
 101             memory_report_invalid_addr(linear);
 102     }
 103     else
 104     {
 105         if (lvalue->addr.Offset)
 106         {
 107             memcpy(result, (void*)lvalue->addr.Offset, size);
 108             ret = TRUE;
 109         }
 110     }
 111     return TRUE;
 112 }
 113
 114 /***********************************************************************
 115  *           memory_write_value
 116  *
 117  * Store a value in memory.
 118  */
 119 BOOL memory_write_value(const struct dbg_lvalue* lvalue, DWORD size, void* value)
 120 {
 121     BOOL        ret = TRUE;
 122     DWORD       os;
 123
 124     os = ~size;
 125     types_get_info(&lvalue->type, TI_GET_LENGTH, &os);
 126     assert(size == os);
 127
 128     /* FIXME: only works on little endian systems */
 129     if (lvalue->cookie == DLV_TARGET)
 130     {
 131         void*       linear = memory_to_linear_addr(&lvalue->addr);
 132         if (!(ret = dbg_write_memory(linear, value, size)))
 133             memory_report_invalid_addr(linear);
 134     }
 135     else
 136     {
 137         memcpy((void*)lvalue->addr.Offset, value, size);
 138     }
 139     return ret;
 140 }
 141
 142 /***********************************************************************
 143  *           memory_examine
 144  *
 145  * Implementation of the 'x' command.
 146  */
 147 void memory_examine(const struct dbg_lvalue *lvalue, int count, char format)
 148 {
 149     int                 i;
 150     char                buffer[256];
 151     ADDRESS             addr;
 152     void               *linear;
 153
 154     if (lvalue->type.id == dbg_itype_none) addr = lvalue->addr;
 155     else
 156     {
 157         addr.Mode = AddrModeFlat;
 158         addr.Offset = types_extract_as_integer( lvalue );
 159     }
 160     linear = memory_to_linear_addr( &addr );
 161
 162     if (format != 'i' && count > 1)
 163     {
 164         print_address(&addr, FALSE);
 165         dbg_printf(": ");
 166     }
 167
 168     switch (format)
 169     {
 170     case 'u':
 171         if (count == 1) count = 256;
 172         memory_get_string(dbg_curr_process, linear,
 173                           TRUE, TRUE, buffer, min(count, sizeof(buffer)));
 174         dbg_printf("%s\n", buffer);
 175         return;
 176     case 's':
 177         if (count == 1) count = 256;
 178         memory_get_string(dbg_curr_process, linear,
 179                           TRUE, FALSE, buffer, min(count, sizeof(buffer)));
 180         dbg_printf("%s\n", buffer);
 181         return;
 182     case 'i':
 183         while (count-- && memory_disasm_one_insn(&addr));
 184         return;
 185     case 'g':
 186         while (count--)
 187         {
 188             GUID guid;
 189             if (!dbg_read_memory(linear, &guid, sizeof(guid)))
 190             {
 191                 memory_report_invalid_addr(linear);
 192                 break;
 193             }
 194             dbg_printf("{%08lx-%04x-%04x-%02x%02x-%02x%02x%02x%02x%02x%02x}\n",
 195                        guid.Data1, guid.Data2, guid.Data3,
 196                        guid.Data4[0], guid.Data4[1], guid.Data4[2], guid.Data4[3],
 197                        guid.Data4[4], guid.Data4[5], guid.Data4[6], guid.Data4[7]);
 198             linear = (char*)linear + sizeof(guid);
 199             addr.Offset += sizeof(guid);
 200             if (count)
 201             {
 202                 print_address(&addr, FALSE);
 203                 dbg_printf(": ");
 204             }
 205         }
 206         return;
 207
 208 #define DO_DUMP2(_t,_l,_f,_vv) {                                        \
 209             _t _v;                                                      \
 210             for (i = 0; i < count; i++) {                               \
 211                 if (!dbg_read_memory(linear, &_v, sizeof(_t)))          \
 212                 { memory_report_invalid_addr(linear); break; }          \
 213                 dbg_printf(_f, (_vv));                                  \
 214                 addr.Offset += sizeof(_t);                              \
 215                 linear = (char*)linear + sizeof(_t);                    \
 216                 if ((i % (_l)) == (_l) - 1 && i != count - 1)           \
 217                 {                                                       \
 218                     dbg_printf("\n");                                   \
 219                     print_address(&addr, FALSE);                        \
 220                     dbg_printf(": ");                                   \
 221                 }                                                       \
 222             }                                                           \
 223             dbg_printf("\n");                                           \
 224         }                                                               \
 225         return
 226 #define DO_DUMP(_t,_l,_f) DO_DUMP2(_t,_l,_f,_v)
 227
 228     case 'x': DO_DUMP(int, 4, " %8.8x");
 229     case 'd': DO_DUMP(unsigned int, 4, " %10d");
 230     case 'w': DO_DUMP(unsigned short, 8, " %04x");
 231     case 'c': DO_DUMP2(char, 32, " %c", (_v < 0x20) ? ' ' : _v);
 232     case 'b': DO_DUMP2(char, 16, " %02x", (_v) & 0xff);
 233     }
 234 }
 235
 236 BOOL memory_get_string(struct dbg_process* pcs, void* addr, BOOL in_debuggee,
 237                        BOOL unicode, char* buffer, int size)
 238 {
 239     DWORD       sz;
 240     WCHAR*      buffW;
 241
 242     buffer[0] = 0;
 243     if (!addr) return FALSE;
 244     if (in_debuggee)
 245     {
 246         BOOL ret;
 247
 248         if (!unicode) ret = pcs->process_io->read(pcs->handle, addr, buffer, size, &sz);
 249         else
 250         {
 251             buffW = HeapAlloc(GetProcessHeap(), 0, size * sizeof(WCHAR));
 252             ret = pcs->process_io->read(pcs->handle, addr, buffW, size * sizeof(WCHAR), &sz);
 253             WideCharToMultiByte(CP_ACP, 0, buffW, sz / sizeof(WCHAR), buffer, size,
 254                                 NULL, NULL);
 255             HeapFree(GetProcessHeap(), 0, buffW);
 256         }
 257         if (size) buffer[size-1] = 0;
 258         return ret;
 259     }
 260     else
 261     {
 262         lstrcpynA(buffer, addr, size);
 263     }
 264     return TRUE;
 265 }
 266
 267 BOOL memory_get_string_indirect(struct dbg_process* pcs, void* addr, BOOL unicode, char* buffer, int size)
 268 {
 269     void*       ad;
 270     DWORD       sz;
 271
 272     buffer[0] = 0;
 273     if (addr &&
 274         pcs->process_io->read(pcs->handle, addr, &ad, sizeof(ad), &sz) && sz == sizeof(ad) && ad)
 275     {
 276         return memory_get_string(pcs, ad, TRUE, unicode, buffer, size);
 277     }
 278     return FALSE;
 279 }
 280
 281 static void print_typed_basic(const struct dbg_lvalue* lvalue)
 282 {
 283     long long int       val_int;
 284     void*               val_ptr;
 285     long double         val_real;
 286     DWORD               tag, size, count, bt;
 287     struct dbg_type     rtype;
 288
 289     if (lvalue->type.id == dbg_itype_none ||
 290         !types_get_info(&lvalue->type, TI_GET_SYMTAG, &tag))
 291         return;
 292
 293     switch (tag)
 294     {
 295     case SymTagBaseType:
 296         if (!types_get_info(&lvalue->type, TI_GET_LENGTH, &size) ||
 297             !types_get_info(&lvalue->type, TI_GET_BASETYPE, &bt))
 298         {
 299             WINE_ERR("Couldn't get information\n");
 300             RaiseException(DEBUG_STATUS_INTERNAL_ERROR, 0, 0, NULL);
 301         }
 302
 303         switch (bt)
 304         {
 305         case btInt:
 306             if (!be_cpu->fetch_integer(lvalue, size, TRUE, &val_int)) return;
 307             dbg_printf("%lld", val_int);
 308             break;
 309         case btUInt:
 310             if (!be_cpu->fetch_integer(lvalue, size, FALSE, &val_int)) return;
 311             dbg_printf("%llu", val_int);
 312             break;
 313         case btFloat:
 314             if (!be_cpu->fetch_float(lvalue, size, &val_real)) return;
 315             dbg_printf("%Lf", val_real);
 316             break;
 317         case btChar:
 318             if (!be_cpu->fetch_integer(lvalue, size, TRUE, &val_int)) return;
 319             /* FIXME: should do the same for a Unicode character (size == 2) */
 320             if (size == 1 && (val_int < 0x20 || val_int > 0x80))
 321                 dbg_printf("%d", (int)val_int);
 322             else
 323                 dbg_printf("'%c'", (char)val_int);
 324             break;
 325         default:
 326             WINE_FIXME("Unsupported basetype %lu\n", bt);
 327             break;
 328         }
 329         break;
 330     case SymTagPointerType:
 331         if (!memory_read_value(lvalue, sizeof(void*), &val_ptr)) return;
 332
 333         if (!types_get_info(&lvalue->type, TI_GET_TYPE, &rtype.id) ||
 334             rtype.id == dbg_itype_none)
 335         {
 336             dbg_printf("Internal symbol error: unable to access memory location %p", val_ptr);
 337             break;
 338         }
 339         rtype.module = lvalue->type.module;
 340         if (types_get_info(&rtype, TI_GET_SYMTAG, &tag) && tag == SymTagBaseType &&
 341             types_get_info(&rtype, TI_GET_BASETYPE, &bt) && bt == btChar &&
 342             types_get_info(&rtype, TI_GET_LENGTH, &size))
 343         {
 344             char    buffer[1024];
 345
 346             memory_get_string(dbg_curr_process, val_ptr,
 347                               lvalue->cookie == DLV_TARGET,
 348                               size == 2, buffer, sizeof(buffer));
 349             dbg_printf("\"%s\"", buffer);
 350         }
 351         else dbg_printf("%p", val_ptr);
 352         break;
 353     case SymTagArrayType:
 354     case SymTagUDT:
 355         assert(lvalue->cookie == DLV_TARGET);
 356         if (!memory_read_value(lvalue, sizeof(val_ptr), &val_ptr)) return;
 357         dbg_printf("%p", val_ptr);
 358         break;
 359     case SymTagEnum:
 360         {
 361             BOOL        ok = FALSE;
 362
 363             assert(lvalue->cookie == DLV_TARGET);
 364             /* FIXME: it depends on underlying type for enums
 365              * (not supported yet in dbghelp)
 366              * Assuming 4 as for an int
 367              */
 368             if (!be_cpu->fetch_integer(lvalue, 4, TRUE, &val_int)) return;
 369
 370             if (types_get_info(&lvalue->type, TI_GET_CHILDRENCOUNT, &count))
 371             {
 372                 char                    buffer[sizeof(TI_FINDCHILDREN_PARAMS) + 256 * sizeof(DWORD)];
 373                 TI_FINDCHILDREN_PARAMS* fcp = (TI_FINDCHILDREN_PARAMS*)buffer;
 374                 WCHAR*                  ptr;
 375                 char                    tmp[256];
 376                 VARIANT                 variant;
 377                 int                     i;
 378                 struct dbg_type         type;
 379
 380                 fcp->Start = 0;
 381                 while (count)
 382                 {
 383                     fcp->Count = min(count, 256);
 384                     if (types_get_info(&lvalue->type, TI_FINDCHILDREN, fcp))
 385                     {
 386                         type.module = lvalue->type.module;
 387                         for (i = 0; i < min(fcp->Count, count); i++)
 388                         {
 389                             type.id = fcp->ChildId[i];
 390                             if (!types_get_info(&type, TI_GET_VALUE, &variant))
 391                                 continue;
 392                             switch (variant.n1.n2.vt)
 393                             {
 394                             case VT_I4: ok = (val_int == variant.n1.n2.n3.lVal); break;
 395                             default: WINE_FIXME("Unsupported variant type (%u)\n", variant.n1.n2.vt);
 396                             }
 397                             if (ok)
 398                             {
 399                                 ptr = NULL;
 400                                 types_get_info(&type, TI_GET_SYMNAME, &ptr);
 401                                 if (!ptr) continue;
 402                                 WideCharToMultiByte(CP_ACP, 0, ptr, -1, tmp, sizeof(tmp), NULL, NULL);
 403                                 HeapFree(GetProcessHeap(), 0, ptr);
 404                                 dbg_printf("%s", tmp);
 405                                 count = 0; /* so that we'll get away from outter loop */
 406                                 break;
 407                             }
 408                         }
 409                     }
 410                 }
 411                 count -= min(count, 256);
 412                 fcp->Start += 256;
 413             }
 414             if (!ok) dbg_printf("%lld", val_int);
 415         }
 416         break;
 417     default:
 418         WINE_FIXME("Unsupported tag %lu\n", tag);
 419         break;
 420     }
 421 }
 422
 423 /***********************************************************************
 424  *           print_basic
 425  *
 426  * Implementation of the 'print' command.
 427  */
 428 void print_basic(const struct dbg_lvalue* lvalue, int count, char format)
 429 {
 430     long int    res;
 431
 432     if (lvalue->type.id == dbg_itype_none)
 433     {
 434         dbg_printf("Unable to evaluate expression\n");
 435         return;
 436     }
 437
 438     res = types_extract_as_integer(lvalue);
 439
 440     /* FIXME: this implies i386 byte ordering */
 441     switch (format)
 442     {
 443     case 'x':
 444         if (lvalue->addr.Mode != AddrModeFlat)
 445             dbg_printf("0x%04lx", res);
 446         else
 447             dbg_printf("0x%08lx", res);
 448         break;
 449
 450     case 'd':
 451         dbg_printf("%ld\n", res);
 452         break;
 453
 454     case 'c':
 455         dbg_printf("%d = '%c'", (char)(res & 0xff), (char)(res & 0xff));
 456         break;
 457
 458     case 'u':
 459         {
 460             WCHAR wch = (WCHAR)(res & 0xFFFF);
 461             dbg_printf("%d = '", wch);
 462             dbg_outputW(&wch, 1);
 463             dbg_printf("'");
 464         }
 465         break;
 466
 467     case 'i':
 468     case 's':
 469     case 'w':
 470     case 'b':
 471         dbg_printf("Format specifier '%c' is meaningless in 'print' command\n", format);
 472     case 0:
 473         print_typed_basic(lvalue);
 474         break;
 475     }
 476 }
 477
 478 void print_bare_address(const ADDRESS* addr)
 479 {
 480     switch (addr->Mode)
 481     {
 482     case AddrModeFlat:
 483         dbg_printf("0x%08lx", addr->Offset);
 484         break;
 485     case AddrModeReal:
 486     case AddrMode1616:
 487         dbg_printf("0x%04x:0x%04lx", addr->Segment, addr->Offset);
 488         break;
 489     case AddrMode1632:
 490         dbg_printf("0x%04x:0x%08lx", addr->Segment, addr->Offset);
 491         break;
 492     default:
 493         dbg_printf("Unknown mode %x\n", addr->Mode);
 494         break;
 495     }
 496 }
 497
 498 /***********************************************************************
 499  *           print_address
 500  *
 501  * Print an 16- or 32-bit address, with the nearest symbol if any.
 502  */
 503 void print_address(const ADDRESS* addr, BOOLEAN with_line)
 504 {
 505     char                buffer[sizeof(SYMBOL_INFO) + 256];
 506     SYMBOL_INFO*        si = (SYMBOL_INFO*)buffer;
 507     void*               lin = memory_to_linear_addr(addr);
 508     DWORD64             disp64;
 509     DWORD               disp;
 510
 511     print_bare_address(addr);
 512
 513     si->SizeOfStruct = sizeof(*si);
 514     si->MaxNameLen   = 256;
 515     if (!SymFromAddr(dbg_curr_process->handle, (DWORD_PTR)lin, &disp64, si)) return;
 516     dbg_printf(" %s", si->Name);
 517     if (disp64) dbg_printf("+0x%lx", (DWORD_PTR)disp64);
 518     if (with_line)
 519     {
 520         IMAGEHLP_LINE               il;
 521         IMAGEHLP_MODULE             im;
 522
 523         il.SizeOfStruct = sizeof(il);
 524         if (SymGetLineFromAddr(dbg_curr_process->handle, (DWORD_PTR)lin, &disp, &il))
 525             dbg_printf(" [%s:%lu]", il.FileName, il.LineNumber);
 526         im.SizeOfStruct = sizeof(im);
 527         if (SymGetModuleInfo(dbg_curr_process->handle, (DWORD_PTR)lin, &im))
 528             dbg_printf(" in %s", im.ModuleName);
 529     }
 530 }
 531
 532 struct sym_enum
 533 {
 534     char*       tmp;
 535     DWORD       frame;
 536 };
 537
 538 static BOOL WINAPI sym_enum_cb(SYMBOL_INFO* sym_info, ULONG size, void* user)
 539 {
 540     struct sym_enum*    se = (struct sym_enum*)user;
 541     DWORD               addr;
 542     unsigned            val;
 543     long                offset;
 544
 545     if ((sym_info->Flags & (SYMFLAG_PARAMETER|SYMFLAG_FRAMEREL)) == (SYMFLAG_PARAMETER|SYMFLAG_FRAMEREL))
 546     {
 547         struct dbg_type     type;
 548
 549         if (se->tmp[0]) strcat(se->tmp, ", ");
 550         addr = se->frame;
 551         type.module = sym_info->ModBase;
 552         type.id = sym_info->TypeIndex;
 553         types_get_info(&type, TI_GET_OFFSET, &offset);
 554         addr += offset;
 555         if (dbg_read_memory((char*)addr, &val, sizeof(val)))
 556             sprintf(se->tmp + strlen(se->tmp), "%s=0x%x", sym_info->Name, val);
 557         else
 558             sprintf(se->tmp + strlen(se->tmp), "%s=<\?\?\?>", sym_info->Name);
 559     }
 560     return TRUE;
 561 }
 562
 563 void print_addr_and_args(const ADDRESS* pc, const ADDRESS* frame)
 564 {
 565     char                        buffer[sizeof(SYMBOL_INFO) + 256];
 566     SYMBOL_INFO*                si = (SYMBOL_INFO*)buffer;
 567     IMAGEHLP_STACK_FRAME        isf;
 568     IMAGEHLP_LINE               il;
 569     IMAGEHLP_MODULE             im;
 570     DWORD64                     disp64;
 571
 572     print_bare_address(pc);
 573
 574     isf.InstructionOffset = (DWORD_PTR)memory_to_linear_addr(pc);
 575     isf.FrameOffset       = (DWORD_PTR)memory_to_linear_addr(frame);
 576
 577     /* grab module where symbol is. If we don't have a module, we cannot print more */
 578     im.SizeOfStruct = sizeof(im);
 579     if (!SymGetModuleInfo(dbg_curr_process->handle, isf.InstructionOffset, &im))
 580         return;
 581
 582     si->SizeOfStruct = sizeof(*si);
 583     si->MaxNameLen   = 256;
 584     if (SymFromAddr(dbg_curr_process->handle, isf.InstructionOffset, &disp64, si))
 585     {
 586         struct sym_enum se;
 587         char            tmp[1024];
 588         DWORD           disp;
 589
 590         dbg_printf(" %s", si->Name);
 591         if (disp) dbg_printf("+0x%lx", (DWORD_PTR)disp64);
 592
 593         SymSetContext(dbg_curr_process->handle, &isf, NULL);
 594         se.tmp = tmp;
 595         se.frame = isf.FrameOffset;
 596         tmp[0] = '\0';
 597         SymEnumSymbols(dbg_curr_process->handle, 0, NULL, sym_enum_cb, &se);
 598         if (tmp[0]) dbg_printf("(%s)", tmp);
 599
 600         il.SizeOfStruct = sizeof(il);
 601         if (SymGetLineFromAddr(dbg_curr_process->handle, isf.InstructionOffset,
 602                                &disp, &il))
 603             dbg_printf(" [%s:%lu]", il.FileName, il.LineNumber);
 604         dbg_printf(" in %s", im.ModuleName);
 605     }
 606     else dbg_printf(" in %s (+0x%lx)",
 607                     im.ModuleName, (DWORD_PTR)(isf.InstructionOffset - im.BaseOfImage));
 608 }
 609
 610 BOOL memory_disasm_one_insn(ADDRESS* addr)
 611 {
 612     char        ch;
 613
 614     print_address(addr, TRUE);
 615     dbg_printf(": ");
 616     if (!dbg_read_memory(memory_to_linear_addr(addr), &ch, sizeof(ch)))
 617     {
 618         dbg_printf("-- no code accessible --\n");
 619         return FALSE;
 620     }
 621     be_cpu->disasm_one_insn(addr, TRUE);
 622     dbg_printf("\n");
 623     return TRUE;
 624 }
 625
 626 void memory_disassemble(const struct dbg_lvalue* xstart,
 627                         const struct dbg_lvalue* xend, int instruction_count)
 628 {
 629     static ADDRESS last = {0,0,0};
 630     int stop = 0;
 631     int i;
 632
 633     if (!xstart && !xend)
 634     {
 635         if (!last.Segment && !last.Offset) memory_get_current_pc(&last);
 636     }
 637     else
 638     {
 639         if (xstart)
 640         {
 641             last.Mode = AddrModeFlat;
 642             last.Offset = types_extract_as_integer(xstart);
 643         }
 644         if (xend)
 645             stop = types_extract_as_integer(xend);
 646     }
 647     for (i = 0; (instruction_count == 0 || i < instruction_count)  &&
 648                 (stop == 0 || last.Offset <= stop); i++)
 649         memory_disasm_one_insn(&last);
 650 }