programs/winedbg/stack.c

   1 /*
   2  * Debugger stack handling
   3  *
   4  * Copyright 1995 Alexandre Julliard
   5  * Copyright 1996 Eric Youngdale
   6  * Copyright 1999 Ove Kåven
   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
  25 #include <stdlib.h>
  26 #include <stdio.h>
  27
  28 #include "debugger.h"
  29 #include "winbase.h"
  30 #include "wine/winbase16.h"
  31 #include "tlhelp32.h"
  32
  33 /***********************************************************************
  34  *           stack_info
  35  *
  36  * Dump the top of the stack
  37  */
  38 void stack_info(void)
  39 {
  40     struct dbg_lvalue lvalue;
  41
  42     lvalue.cookie = 0;
  43     lvalue.type.id = dbg_itype_segptr;
  44     lvalue.type.module = 0;
  45
  46     /* FIXME: we assume stack grows the same way as on i386 */
  47     if (!memory_get_current_stack(&lvalue.addr))
  48         dbg_printf("Bad segment (%d)\n", lvalue.addr.Segment);
  49
  50     dbg_printf("Stack dump:\n");
  51     switch (lvalue.addr.Mode)
  52     {
  53     case AddrModeFlat: /* 32-bit mode */
  54     case AddrMode1632: /* 32-bit mode */
  55         memory_examine(&lvalue, 24, 'x');
  56         break;
  57     case AddrModeReal:  /* 16-bit mode */
  58     case AddrMode1616:
  59         memory_examine(&lvalue, 24, 'w');
  60         break;
  61     }
  62 }
  63
  64 static BOOL stack_set_frame_internal(int newframe)
  65 {
  66     if (newframe >= dbg_curr_thread->num_frames)
  67         newframe = dbg_curr_thread->num_frames - 1;
  68     if (newframe < 0)
  69         newframe = 0;
  70
  71     if (dbg_curr_thread->curr_frame != newframe)
  72     {
  73         IMAGEHLP_STACK_FRAME    ihsf;
  74
  75         dbg_curr_thread->curr_frame = newframe;
  76         stack_get_current_frame(&ihsf);
  77         SymSetContext(dbg_curr_process->handle, &ihsf, NULL);
  78     }
  79     return TRUE;
  80 }
  81
  82 static BOOL stack_get_frame(int nf, IMAGEHLP_STACK_FRAME* ihsf)
  83 {
  84     memset(ihsf, 0, sizeof(*ihsf));
  85     ihsf->InstructionOffset = (unsigned long)memory_to_linear_addr(&dbg_curr_thread->frames[nf].addr_pc);
  86     ihsf->FrameOffset = (unsigned long)memory_to_linear_addr(&dbg_curr_thread->frames[nf].addr_frame);
  87     return TRUE;
  88 }
  89
  90 BOOL stack_get_current_frame(IMAGEHLP_STACK_FRAME* ihsf)
  91 {
  92     /*
  93      * If we don't have a valid backtrace, then just return.
  94      */
  95     if (dbg_curr_thread->frames == NULL) return FALSE;
  96     return stack_get_frame(dbg_curr_thread->curr_frame, ihsf);
  97 }
  98
  99 BOOL stack_set_frame(int newframe)
 100 {
 101     ADDRESS64   addr;
 102     if (!stack_set_frame_internal(newframe)) return FALSE;
 103     addr.Mode = AddrModeFlat;
 104     addr.Offset = (unsigned long)memory_to_linear_addr(&dbg_curr_thread->frames[dbg_curr_thread->curr_frame].addr_pc);
 105     source_list_from_addr(&addr, 0);
 106     return TRUE;
 107 }
 108
 109 /******************************************************************
 110  *              stack_get_current_symbol
 111  *
 112  * Retrieves the symbol information for the current frame element
 113  */
 114 BOOL stack_get_current_symbol(SYMBOL_INFO* symbol)
 115 {
 116     IMAGEHLP_STACK_FRAME        ihsf;
 117     DWORD64                     disp;
 118
 119     if (!stack_get_current_frame(&ihsf)) return FALSE;
 120     return SymFromAddr(dbg_curr_process->handle, ihsf.InstructionOffset,
 121                        &disp, symbol);
 122 }
 123
 124 static BOOL CALLBACK stack_read_mem(HANDLE hProc, DWORD64 addr,
 125                                     PVOID buffer, DWORD size, PDWORD written)
 126 {
 127     SIZE_T sz;
 128     BOOL ret;
 129
 130     struct dbg_process* pcs = dbg_get_process_h(hProc);
 131     if (!pcs) return FALSE;
 132     ret = pcs->process_io->read(hProc, (const void*)(DWORD_PTR)addr, buffer,
 133                                 size, &sz);
 134     if (written != NULL) *written = sz;
 135     return ret;
 136 }
 137
 138 /******************************************************************
 139  *              stack_fetch_frames
 140  *
 141  * Do a backtrace on the the current thread
 142  */
 143 unsigned stack_fetch_frames(void)
 144 {
 145     STACKFRAME64 sf;
 146     unsigned     nf = 0;
 147     /* as native stackwalk can modify the context passed to it, simply copy
 148      * it to avoid any damage
 149      */
 150     CONTEXT      ctx = dbg_context;
 151
 152     HeapFree(GetProcessHeap(), 0, dbg_curr_thread->frames);
 153     dbg_curr_thread->frames = NULL;
 154
 155     memset(&sf, 0, sizeof(sf));
 156     memory_get_current_frame(&sf.AddrFrame);
 157     memory_get_current_pc(&sf.AddrPC);
 158
 159     /* don't confuse StackWalk by passing in inconsistent addresses */
 160     if ((sf.AddrPC.Mode == AddrModeFlat) && (sf.AddrFrame.Mode != AddrModeFlat))
 161     {
 162         sf.AddrFrame.Offset = (DWORD)memory_to_linear_addr(&sf.AddrFrame);
 163         sf.AddrFrame.Mode = AddrModeFlat;
 164     }
 165
 166     while (StackWalk64(IMAGE_FILE_MACHINE_I386, dbg_curr_process->handle,
 167                        dbg_curr_thread->handle, &sf, &ctx, stack_read_mem,
 168                        SymFunctionTableAccess64, SymGetModuleBase64, NULL))
 169     {
 170         dbg_curr_thread->frames = dbg_heap_realloc(dbg_curr_thread->frames,
 171                                                    (nf + 1) * sizeof(dbg_curr_thread->frames[0]));
 172
 173         dbg_curr_thread->frames[nf].addr_pc = sf.AddrPC;
 174         dbg_curr_thread->frames[nf].addr_frame = sf.AddrFrame;
 175         nf++;
 176         /* we've probably gotten ourselves into an infinite loop so bail */
 177         if (nf > 200) break;
 178     }
 179     dbg_curr_thread->curr_frame = -1;
 180     dbg_curr_thread->num_frames = nf;
 181     stack_set_frame_internal(0);
 182     return nf;
 183 }
 184
 185 struct sym_enum
 186 {
 187     char*       tmp;
 188     DWORD       frame;
 189 };
 190
 191 static BOOL WINAPI sym_enum_cb(SYMBOL_INFO* sym_info, ULONG size, void* user)
 192 {
 193     struct sym_enum*    se = (struct sym_enum*)user;
 194     char                tmp[32];
 195
 196     if (sym_info->Flags & SYMFLAG_PARAMETER)
 197     {
 198         if (se->tmp[0]) strcat(se->tmp, ", ");
 199
 200         if (sym_info->Flags & SYMFLAG_REGREL)
 201         {
 202             unsigned    val;
 203             DWORD       addr = se->frame + sym_info->Address;
 204
 205             if (!dbg_read_memory((char*)addr, &val, sizeof(val)))
 206                 snprintf(tmp, sizeof(tmp), "<*** cannot read at 0x%lx ***>", addr);
 207             else
 208                 snprintf(tmp, sizeof(tmp), "0x%x", val);
 209         }
 210         else if (sym_info->Flags & SYMFLAG_REGISTER)
 211         {
 212             DWORD* pval;
 213
 214             if (memory_get_register(sym_info->Register, &pval, tmp, sizeof(tmp)))
 215                 snprintf(tmp, sizeof(tmp), "0x%lx", *pval);
 216         }
 217         sprintf(se->tmp + strlen(se->tmp), "%s=%s", sym_info->Name, tmp);
 218     }
 219     return TRUE;
 220 }
 221
 222 static void stack_print_addr_and_args(int nf)
 223 {
 224     char                        buffer[sizeof(SYMBOL_INFO) + 256];
 225     SYMBOL_INFO*                si = (SYMBOL_INFO*)buffer;
 226     IMAGEHLP_STACK_FRAME        ihsf;
 227     IMAGEHLP_LINE               il;
 228     IMAGEHLP_MODULE             im;
 229     DWORD64                     disp64;
 230
 231     print_bare_address(&dbg_curr_thread->frames[nf].addr_pc);
 232
 233     stack_get_frame(nf, &ihsf);
 234
 235     /* grab module where symbol is. If we don't have a module, we cannot print more */
 236     im.SizeOfStruct = sizeof(im);
 237     if (!SymGetModuleInfo(dbg_curr_process->handle, ihsf.InstructionOffset, &im))
 238         return;
 239
 240     si->SizeOfStruct = sizeof(*si);
 241     si->MaxNameLen   = 256;
 242     if (SymFromAddr(dbg_curr_process->handle, ihsf.InstructionOffset, &disp64, si))
 243     {
 244         struct sym_enum se;
 245         char            tmp[1024];
 246         DWORD           disp;
 247
 248         dbg_printf(" %s", si->Name);
 249         if (disp64) dbg_printf("+0x%lx", (DWORD_PTR)disp64);
 250
 251         SymSetContext(dbg_curr_process->handle, &ihsf, NULL);
 252         se.tmp = tmp;
 253         se.frame = ihsf.FrameOffset;
 254         tmp[0] = '\0';
 255         SymEnumSymbols(dbg_curr_process->handle, 0, NULL, sym_enum_cb, &se);
 256         if (tmp[0]) dbg_printf("(%s)", tmp);
 257
 258         il.SizeOfStruct = sizeof(il);
 259         if (SymGetLineFromAddr(dbg_curr_process->handle, ihsf.InstructionOffset,
 260                                &disp, &il))
 261             dbg_printf(" [%s:%lu]", il.FileName, il.LineNumber);
 262         dbg_printf(" in %s", im.ModuleName);
 263     }
 264     else dbg_printf(" in %s (+0x%lx)",
 265                     im.ModuleName, (DWORD_PTR)(ihsf.InstructionOffset - im.BaseOfImage));
 266 }
 267
 268 /******************************************************************
 269  *              backtrace
 270  *
 271  * Do a backtrace on the the current thread
 272  */
 273 static void backtrace(void)
 274 {
 275     unsigned                    cf = dbg_curr_thread->curr_frame;
 276     IMAGEHLP_STACK_FRAME        ihsf;
 277
 278     dbg_printf("Backtrace:\n");
 279     for (dbg_curr_thread->curr_frame = 0;
 280          dbg_curr_thread->curr_frame < dbg_curr_thread->num_frames;
 281          dbg_curr_thread->curr_frame++)
 282     {
 283         dbg_printf("%s%d ",
 284                    (cf == dbg_curr_thread->curr_frame ? "=>" : "  "),
 285                    dbg_curr_thread->curr_frame + 1);
 286         stack_print_addr_and_args(dbg_curr_thread->curr_frame);
 287         dbg_printf(" (");
 288         print_bare_address(&dbg_curr_thread->frames[dbg_curr_thread->curr_frame].addr_frame);
 289         dbg_printf(")\n");
 290     }
 291     /* reset context to current stack frame */
 292     dbg_curr_thread->curr_frame = cf;
 293     if (!dbg_curr_thread->frames) return;
 294     stack_get_frame(dbg_curr_thread->curr_frame, &ihsf);
 295     SymSetContext(dbg_curr_process->handle, &ihsf, NULL);
 296 }
 297
 298 /******************************************************************
 299  *              backtrace_tid
 300  *
 301  * Do a backtrace on a thread from its process and its identifier
 302  * (preserves current thread and context information)
 303  */
 304 static void backtrace_tid(struct dbg_process* pcs, DWORD tid)
 305 {
 306     struct dbg_thread*  thread = dbg_curr_thread;
 307
 308     if (!(dbg_curr_thread = dbg_get_thread(pcs, tid)))
 309         dbg_printf("Unknown thread id (0x%lx) in process (0x%lx)\n", tid, pcs->pid);
 310     else
 311     {
 312         CONTEXT saved_ctx = dbg_context;
 313
 314         dbg_curr_tid = dbg_curr_thread->tid;
 315         memset(&dbg_context, 0, sizeof(dbg_context));
 316         dbg_context.ContextFlags = CONTEXT_FULL;
 317         if (SuspendThread(dbg_curr_thread->handle) != -1)
 318         {
 319             if (!GetThreadContext(dbg_curr_thread->handle, &dbg_context))
 320             {
 321                 dbg_printf("Can't get context for thread 0x%lx in current process\n",
 322                            tid);
 323             }
 324             else
 325             {
 326                 stack_fetch_frames();
 327                 backtrace();
 328             }
 329             ResumeThread(dbg_curr_thread->handle);
 330         }
 331         else dbg_printf("Can't suspend thread 0x%lx in current process\n", tid);
 332         dbg_context = saved_ctx;
 333     }
 334     dbg_curr_thread = thread;
 335     dbg_curr_tid = thread ? thread->tid : 0;
 336 }
 337
 338 /******************************************************************
 339  *              backtrace_all
 340  *
 341  * Do a backtrace on every running thread in the system (except the debugger)
 342  * (preserves current process information)
 343  */
 344 static void backtrace_all(void)
 345 {
 346     struct dbg_process* process = dbg_curr_process;
 347     THREADENTRY32       entry;
 348     HANDLE              snapshot = CreateToolhelp32Snapshot(TH32CS_SNAPTHREAD, 0);
 349
 350     if (snapshot == INVALID_HANDLE_VALUE)
 351     {
 352         dbg_printf("Unable to create toolhelp snapshot\n");
 353         return;
 354     }
 355
 356     entry.dwSize = sizeof(entry);
 357     if (Thread32First(snapshot, &entry))
 358     {
 359         do
 360         {
 361             if (entry.th32OwnerProcessID == GetCurrentProcessId()) continue;
 362             if (dbg_curr_process && dbg_curr_pid != entry.th32OwnerProcessID)
 363                 dbg_curr_process->process_io->close_process(dbg_curr_process, FALSE);
 364
 365             if (entry.th32OwnerProcessID != dbg_curr_pid)
 366             {
 367                 if (!dbg_attach_debuggee(entry.th32OwnerProcessID, FALSE))
 368                 {
 369                     dbg_printf("\nwarning: could not attach to 0x%lx\n",
 370                                entry.th32OwnerProcessID);
 371                     continue;
 372                 }
 373                 dbg_curr_pid = dbg_curr_process->pid;
 374                 dbg_active_wait_for_first_exception();
 375             }
 376
 377             dbg_printf("\nBacktracing for thread 0x%lx in process 0x%lx (%s):\n",
 378                        entry.th32ThreadID, dbg_curr_pid, dbg_curr_process->imageName);
 379             backtrace_tid(dbg_curr_process, entry.th32ThreadID);
 380         }
 381         while (Thread32Next(snapshot, &entry));
 382
 383         if (dbg_curr_process)
 384             dbg_curr_process->process_io->close_process(dbg_curr_process, FALSE);
 385     }
 386     CloseHandle(snapshot);
 387     dbg_curr_process = process;
 388     dbg_curr_pid = process ? process->pid : 0;
 389 }
 390
 391 void stack_backtrace(DWORD tid)
 392 {
 393     /* backtrace every thread in every process except the debugger itself,
 394      * invoking via "bt all"
 395      */
 396     if (tid == -1) return backtrace_all();
 397
 398     if (!dbg_curr_process)
 399     {
 400         dbg_printf("You must be attached to a process to run this command.\n");
 401         return;
 402     }
 403
 404     if (tid == dbg_curr_tid)
 405     {
 406         backtrace();
 407     }
 408     else
 409     {
 410         backtrace_tid(dbg_curr_process, tid);
 411     }
 412 }