2 * Debugger stack handling
4 * Copyright 1995 Alexandre Julliard
5 * Copyright 1996 Eric Youngdale
6 * Copyright 1999 Ove Kåven
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.
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.
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
30 #include "wine/winbase16.h"
33 /***********************************************************************
36 * Dump the top of the stack. If len <= 0, a default length is used.
38 void stack_info(int len)
40 struct dbg_lvalue lvalue;
46 lvalue.type.id = dbg_itype_segptr;
47 lvalue.type.module = 0;
49 /* FIXME: we assume stack grows the same way as on i386 */
50 if (!memory_get_current_stack(&lvalue.addr))
51 dbg_printf("Bad segment (%d)\n", lvalue.addr.Segment);
53 dbg_printf("Stack dump:\n");
54 switch (lvalue.addr.Mode)
56 case AddrModeFlat: /* 32-bit or 64-bit mode */
57 memory_examine(&lvalue, len, 'a');
59 case AddrMode1632: /* 32-bit mode */
60 memory_examine(&lvalue, len, 'x');
62 case AddrModeReal: /* 16-bit mode */
64 memory_examine(&lvalue, len, 'w');
69 static BOOL stack_set_frame_internal(int newframe)
71 if (newframe >= dbg_curr_thread->num_frames)
72 newframe = dbg_curr_thread->num_frames - 1;
76 if (dbg_curr_thread->curr_frame != newframe)
78 IMAGEHLP_STACK_FRAME ihsf;
80 dbg_curr_thread->curr_frame = newframe;
81 stack_get_current_frame(&ihsf);
82 SymSetContext(dbg_curr_process->handle, &ihsf, NULL);
87 static BOOL stack_get_frame(int nf, IMAGEHLP_STACK_FRAME* ihsf)
89 memset(ihsf, 0, sizeof(*ihsf));
90 ihsf->InstructionOffset = dbg_curr_thread->frames[nf].linear_pc;
91 /* if we're not the first frame, InstructionOffset is the return address
92 * after the call instruction (at least on most processors I know of).
93 * However, there are cases where this address is outside of the current function.
94 * This happens when the called function is marked <NO RETURN>, in which
95 * case the compiler can omit the epilog (gcc 4 does it)
96 * Therefore, we decrement InstructionOffset in order to ensure that
97 * the considered address is really inside the current function.
99 if (nf) ihsf->InstructionOffset--;
100 ihsf->FrameOffset = dbg_curr_thread->frames[nf].linear_frame;
101 ihsf->StackOffset = dbg_curr_thread->frames[nf].linear_stack;
105 BOOL stack_get_current_frame(IMAGEHLP_STACK_FRAME* ihsf)
108 * If we don't have a valid backtrace, then just return.
110 if (dbg_curr_thread->frames == NULL) return FALSE;
111 return stack_get_frame(dbg_curr_thread->curr_frame, ihsf);
114 BOOL stack_get_register_frame(const struct dbg_internal_var* div, DWORD_PTR** pval)
116 if (dbg_curr_thread->frames == NULL) return FALSE;
117 if (dbg_curr_thread->frames[dbg_curr_thread->curr_frame].is_ctx_valid)
118 *pval = (DWORD_PTR*)((char*)&dbg_curr_thread->frames[dbg_curr_thread->curr_frame].context +
119 (DWORD_PTR)div->pval);
122 enum be_cpu_addr kind;
124 if (!be_cpu->get_register_info(div->val, &kind)) return FALSE;
126 /* reuse some known registers directly out of stackwalk details */
130 *pval = &dbg_curr_thread->frames[dbg_curr_thread->curr_frame].linear_pc;
132 case be_cpu_addr_stack:
133 *pval = &dbg_curr_thread->frames[dbg_curr_thread->curr_frame].linear_stack;
135 case be_cpu_addr_frame:
136 *pval = &dbg_curr_thread->frames[dbg_curr_thread->curr_frame].linear_frame;
143 BOOL stack_set_frame(int newframe)
146 if (!stack_set_frame_internal(newframe)) return FALSE;
147 addr.Mode = AddrModeFlat;
148 addr.Offset = (DWORD_PTR)memory_to_linear_addr(&dbg_curr_thread->frames[dbg_curr_thread->curr_frame].addr_pc);
149 source_list_from_addr(&addr, 0);
153 /******************************************************************
154 * stack_get_current_symbol
156 * Retrieves the symbol information for the current frame element
158 BOOL stack_get_current_symbol(SYMBOL_INFO* symbol)
160 IMAGEHLP_STACK_FRAME ihsf;
163 if (!stack_get_current_frame(&ihsf)) return FALSE;
164 return SymFromAddr(dbg_curr_process->handle, ihsf.InstructionOffset,
168 static BOOL CALLBACK stack_read_mem(HANDLE hProc, DWORD64 addr,
169 PVOID buffer, DWORD size, PDWORD written)
174 struct dbg_process* pcs = dbg_get_process_h(hProc);
175 if (!pcs) return FALSE;
176 ret = pcs->process_io->read(hProc, (const void*)(DWORD_PTR)addr, buffer,
178 if (written != NULL) *written = sz;
182 /******************************************************************
185 * Do a backtrace on the current thread
187 unsigned stack_fetch_frames(const CONTEXT* _ctx)
191 /* as native stackwalk can modify the context passed to it, simply copy
192 * it to avoid any damage
196 HeapFree(GetProcessHeap(), 0, dbg_curr_thread->frames);
197 dbg_curr_thread->frames = NULL;
199 memset(&sf, 0, sizeof(sf));
200 be_cpu->get_addr(dbg_curr_thread->handle, &ctx, be_cpu_addr_frame, &sf.AddrFrame);
201 be_cpu->get_addr(dbg_curr_thread->handle, &ctx, be_cpu_addr_pc, &sf.AddrPC);
202 be_cpu->get_addr(dbg_curr_thread->handle, &ctx, be_cpu_addr_stack, &sf.AddrStack);
204 /* don't confuse StackWalk by passing in inconsistent addresses */
205 if ((sf.AddrPC.Mode == AddrModeFlat) && (sf.AddrFrame.Mode != AddrModeFlat))
207 sf.AddrFrame.Offset = (ULONG_PTR)memory_to_linear_addr(&sf.AddrFrame);
208 sf.AddrFrame.Mode = AddrModeFlat;
211 while (StackWalk64(be_cpu->machine, dbg_curr_process->handle,
212 dbg_curr_thread->handle, &sf, &ctx, stack_read_mem,
213 SymFunctionTableAccess64, SymGetModuleBase64, NULL))
215 dbg_curr_thread->frames = dbg_heap_realloc(dbg_curr_thread->frames,
216 (nf + 1) * sizeof(dbg_curr_thread->frames[0]));
218 dbg_curr_thread->frames[nf].addr_pc = sf.AddrPC;
219 dbg_curr_thread->frames[nf].linear_pc = (DWORD_PTR)memory_to_linear_addr(&sf.AddrPC);
220 dbg_curr_thread->frames[nf].addr_frame = sf.AddrFrame;
221 dbg_curr_thread->frames[nf].linear_frame = (DWORD_PTR)memory_to_linear_addr(&sf.AddrFrame);
222 dbg_curr_thread->frames[nf].addr_stack = sf.AddrStack;
223 dbg_curr_thread->frames[nf].linear_stack = (DWORD_PTR)memory_to_linear_addr(&sf.AddrStack);
224 dbg_curr_thread->frames[nf].context = ctx;
225 /* FIXME: can this heuristic be improved: we declare first context always valid, and next ones
226 * if it has been modified by the call to StackWalk...
228 dbg_curr_thread->frames[nf].is_ctx_valid =
230 (dbg_curr_thread->frames[nf - 1].is_ctx_valid &&
231 memcmp(&dbg_curr_thread->frames[nf - 1].context, &ctx, sizeof(ctx))));
233 /* we've probably gotten ourselves into an infinite loop so bail */
236 dbg_curr_thread->curr_frame = -1;
237 dbg_curr_thread->num_frames = nf;
238 stack_set_frame_internal(0);
248 static BOOL WINAPI sym_enum_cb(PSYMBOL_INFO sym_info, ULONG size, PVOID user)
250 struct sym_enum* se = user;
252 if (sym_info->Flags & SYMFLAG_PARAMETER)
254 if (!se->first) dbg_printf(", "); else se->first = FALSE;
255 symbol_print_local(sym_info, se->frame, FALSE);
260 static void stack_print_addr_and_args(int nf)
262 char buffer[sizeof(SYMBOL_INFO) + 256];
263 SYMBOL_INFO* si = (SYMBOL_INFO*)buffer;
264 IMAGEHLP_STACK_FRAME ihsf;
269 print_bare_address(&dbg_curr_thread->frames[nf].addr_pc);
271 stack_get_frame(nf, &ihsf);
273 /* grab module where symbol is. If we don't have a module, we cannot print more */
274 im.SizeOfStruct = sizeof(im);
275 if (!SymGetModuleInfo(dbg_curr_process->handle, ihsf.InstructionOffset, &im))
278 si->SizeOfStruct = sizeof(*si);
279 si->MaxNameLen = 256;
280 if (SymFromAddr(dbg_curr_process->handle, ihsf.InstructionOffset, &disp64, si))
285 dbg_printf(" %s", si->Name);
286 if (disp64) dbg_printf("+0x%lx", (DWORD_PTR)disp64);
288 SymSetContext(dbg_curr_process->handle, &ihsf, NULL);
290 se.frame = ihsf.FrameOffset;
292 SymEnumSymbols(dbg_curr_process->handle, 0, NULL, sym_enum_cb, &se);
295 il.SizeOfStruct = sizeof(il);
296 if (SymGetLineFromAddr64(dbg_curr_process->handle,
297 ihsf.InstructionOffset, &disp, &il))
298 dbg_printf(" [%s:%u]", il.FileName, il.LineNumber);
299 dbg_printf(" in %s", im.ModuleName);
301 else dbg_printf(" in %s (+0x%lx)",
302 im.ModuleName, (DWORD_PTR)(ihsf.InstructionOffset - im.BaseOfImage));
305 /******************************************************************
308 * Do a backtrace on the current thread
310 static void backtrace(void)
312 unsigned cf = dbg_curr_thread->curr_frame;
313 IMAGEHLP_STACK_FRAME ihsf;
315 dbg_printf("Backtrace:\n");
316 for (dbg_curr_thread->curr_frame = 0;
317 dbg_curr_thread->curr_frame < dbg_curr_thread->num_frames;
318 dbg_curr_thread->curr_frame++)
321 (cf == dbg_curr_thread->curr_frame ? "=>" : " "),
322 dbg_curr_thread->curr_frame);
323 stack_print_addr_and_args(dbg_curr_thread->curr_frame);
325 print_bare_address(&dbg_curr_thread->frames[dbg_curr_thread->curr_frame].addr_frame);
328 /* reset context to current stack frame */
329 dbg_curr_thread->curr_frame = cf;
330 if (!dbg_curr_thread->frames) return;
331 stack_get_frame(dbg_curr_thread->curr_frame, &ihsf);
332 SymSetContext(dbg_curr_process->handle, &ihsf, NULL);
335 /******************************************************************
338 * Do a backtrace on a thread from its process and its identifier
339 * (preserves current thread and context information)
341 static void backtrace_tid(struct dbg_process* pcs, DWORD tid)
343 struct dbg_thread* thread = dbg_curr_thread;
345 if (!(dbg_curr_thread = dbg_get_thread(pcs, tid)))
346 dbg_printf("Unknown thread id (%04x) in process (%04x)\n", tid, pcs->pid);
351 dbg_curr_tid = dbg_curr_thread->tid;
352 memset(&context, 0, sizeof(context));
353 context.ContextFlags = CONTEXT_FULL;
354 if (SuspendThread(dbg_curr_thread->handle) != -1)
356 if (!GetThreadContext(dbg_curr_thread->handle, &context))
358 dbg_printf("Can't get context for thread %04x in current process\n",
363 stack_fetch_frames(&context);
366 ResumeThread(dbg_curr_thread->handle);
368 else dbg_printf("Can't suspend thread %04x in current process\n", tid);
370 dbg_curr_thread = thread;
371 dbg_curr_tid = thread ? thread->tid : 0;
374 /******************************************************************
377 * Do a backtrace on every running thread in the system (except the debugger)
378 * (preserves current process information)
380 static void backtrace_all(void)
382 struct dbg_process* process = dbg_curr_process;
383 struct dbg_thread* thread = dbg_curr_thread;
384 CONTEXT ctx = dbg_context;
385 DWORD cpid = dbg_curr_pid;
387 HANDLE snapshot = CreateToolhelp32Snapshot(TH32CS_SNAPTHREAD, 0);
389 if (snapshot == INVALID_HANDLE_VALUE)
391 dbg_printf("Unable to create toolhelp snapshot\n");
395 entry.dwSize = sizeof(entry);
396 if (Thread32First(snapshot, &entry))
400 if (entry.th32OwnerProcessID == GetCurrentProcessId()) continue;
401 if (dbg_curr_process && dbg_curr_pid != entry.th32OwnerProcessID &&
402 cpid != dbg_curr_pid)
403 dbg_curr_process->process_io->close_process(dbg_curr_process, FALSE);
405 if (entry.th32OwnerProcessID == cpid)
407 dbg_curr_process = process;
410 else if (entry.th32OwnerProcessID != dbg_curr_pid)
412 if (!dbg_attach_debuggee(entry.th32OwnerProcessID, FALSE))
414 dbg_printf("\nwarning: could not attach to %04x\n",
415 entry.th32OwnerProcessID);
418 dbg_curr_pid = dbg_curr_process->pid;
419 dbg_active_wait_for_first_exception();
422 dbg_printf("\nBacktracing for thread %04x in process %04lx (%s):\n",
423 entry.th32ThreadID, dbg_curr_pid,
424 dbg_W2A(dbg_curr_process->imageName, -1));
425 backtrace_tid(dbg_curr_process, entry.th32ThreadID);
427 while (Thread32Next(snapshot, &entry));
429 if (dbg_curr_process && cpid != dbg_curr_pid)
430 dbg_curr_process->process_io->close_process(dbg_curr_process, FALSE);
432 CloseHandle(snapshot);
433 dbg_curr_process = process;
435 dbg_curr_thread = thread;
436 dbg_curr_tid = thread ? thread->tid : 0;
440 void stack_backtrace(DWORD tid)
442 /* backtrace every thread in every process except the debugger itself,
443 * invoking via "bt all"
445 if (tid == -1) return backtrace_all();
447 if (!dbg_curr_process)
449 dbg_printf("You must be attached to a process to run this command.\n");
453 if (tid == dbg_curr_tid)
459 backtrace_tid(dbg_curr_process, tid);