2 * Debugger stack handling
4 * Copyright 1995 Alexandre Julliard
5 * Copyright 1996 Eric Youngdale
6 * Copyright 1999 Ove Kåven
14 #include "stackframe.h"
19 * We keep this info for each frame, so that we can
20 * find local variable information correctly.
28 struct symbol_info frame;
32 static struct bt_info * frames = NULL;
50 /***********************************************************************
53 * Dump the top of the stack
55 void DEBUG_InfoStack(void)
61 value.cookie = DV_TARGET;
62 value.addr.seg = DEBUG_context.SegSs;
63 value.addr.off = DEBUG_context.Esp;
65 DEBUG_Printf(DBG_CHN_MESG,"Stack dump:\n");
66 switch (DEBUG_GetSelectorType(value.addr.seg))
68 case MODE_32: /* 32-bit mode */
69 DEBUG_ExamineMemory( &value, 24, 'x' );
71 case MODE_16: /* 16-bit mode */
73 value.addr.off &= 0xffff;
74 DEBUG_ExamineMemory( &value, 24, 'w' );
77 DEBUG_Printf(DBG_CHN_MESG, "Bad segment (%ld)\n", value.addr.seg);
79 DEBUG_Printf(DBG_CHN_MESG,"\n");
84 static void DEBUG_ForceFrame(DBG_ADDR *stack, DBG_ADDR *code, int frameno, enum dbg_mode mode,
85 int noisy, const char *caveat)
87 int theframe = nframe++;
88 frames = (struct bt_info *)DBG_realloc(frames,
89 nframe*sizeof(struct bt_info));
91 DEBUG_Printf(DBG_CHN_MESG,"%s%d ", (theframe == curr_frame ? "=>" : " "),
93 frames[theframe].cs = code->seg;
94 frames[theframe].eip = code->off;
96 frames[theframe].frame = DEBUG_PrintAddressAndArgs( code, mode, stack->off, TRUE );
98 DEBUG_FindNearestSymbol( code, TRUE,
99 &frames[theframe].frame.sym, stack->off,
100 &frames[theframe].frame.list);
101 frames[theframe].ss = stack->seg;
102 frames[theframe].ebp = stack->off;
104 DEBUG_Printf( DBG_CHN_MESG, (mode != MODE_32) ? " (bp=%04lx%s)\n" : " (ebp=%08lx%s)\n",
105 stack->off, caveat?caveat:"" );
109 static BOOL DEBUG_Frame16(DBG_THREAD* thread, DBG_ADDR *addr, unsigned int *cs, int frameno, int noisy)
111 unsigned int possible_cs = 0;
113 void* p = (void*)DEBUG_ToLinear(addr);
116 if (!p) return FALSE;
118 if (!DEBUG_READ_MEM(p, &frame, sizeof(frame))) {
119 if (noisy) DEBUG_InvalAddr(addr);
122 if (!frame.bp) return FALSE;
124 if (frame.bp & 1) *cs = frame.cs;
126 /* not explicitly marked as far call,
127 * but check whether it could be anyway */
128 if (((frame.cs&7)==7) && (frame.cs != *cs)) {
131 if (GetThreadSelectorEntry( thread->handle, frame.cs, &le) &&
132 (le.HighWord.Bits.Type & 0x08)) { /* code segment */
133 /* it is very uncommon to push a code segment cs as
134 * a parameter, so this should work in most cases */
135 *cs = possible_cs = frame.cs;
141 addr->off = frame.bp & ~1;
142 DEBUG_ForceFrame(addr, &code, frameno, MODE_16, noisy,
143 possible_cs ? ", far call assumed" : NULL );
147 static BOOL DEBUG_Frame32(DBG_ADDR *addr, unsigned int *cs, int frameno, int noisy)
150 void* p = (void*)DEBUG_ToLinear(addr);
152 DWORD old_bp = addr->off;
154 if (!p) return FALSE;
156 if (!DEBUG_READ_MEM(p, &frame, sizeof(frame))) {
157 if (noisy) DEBUG_InvalAddr(addr);
160 if (!frame.ip) return FALSE;
164 addr->off = frame.bp;
165 DEBUG_ForceFrame(addr, &code, frameno, MODE_32, noisy, NULL);
166 if (addr->off == old_bp) return FALSE;
172 /***********************************************************************
175 * Display a stack back-trace.
177 void DEBUG_BackTrace(DWORD tid, BOOL noisy)
180 DBG_ADDR addr, sw_addr, code, tmp;
182 int frameno = 0, is16, ok;
183 DWORD next_switch, cur_switch, p;
184 STACK16FRAME frame16;
185 STACK32FRAME frame32;
191 int copy_curr_frame = 0;
192 struct bt_info* copy_frames = NULL;
194 if (noisy) DEBUG_Printf( DBG_CHN_MESG, "Backtrace:\n" );
196 if (tid == DEBUG_CurrTid)
199 thread = DEBUG_CurrThread;
201 if (frames) DBG_free( frames );
202 /* frames = (struct bt_info *) DBG_alloc( sizeof(struct bt_info) ); */
206 thread = DEBUG_GetThread(DEBUG_CurrProcess, tid);
210 DEBUG_Printf( DBG_CHN_MESG, "Unknown thread id (0x%08lx) in current process\n", tid);
213 memset(&ctx, 0, sizeof(ctx));
214 ctx.ContextFlags = CONTEXT_CONTROL | CONTEXT_SEGMENTS;
216 if ( SuspendThread( thread->handle ) == -1 ||
217 !GetThreadContext( thread->handle, &ctx ))
219 DEBUG_Printf( DBG_CHN_MESG, "Can't get context for thread id (0x%08lx) in current process\n", tid);
222 /* need to avoid trashing stack frame for current thread */
223 copy_nframe = nframe;
224 copy_frames = frames;
225 copy_curr_frame = curr_frame;
235 if (DEBUG_IsSelectorSystem(ss)) ss = 0;
236 if (DEBUG_IsSelectorSystem(cs)) cs = 0;
238 /* first stack frame from registers */
239 switch (DEBUG_GetSelectorType(ss))
246 DEBUG_ForceFrame( &addr, &code, frameno, MODE_32, noisy, NULL );
247 if (!(code.seg || code.off)) {
248 /* trying to execute a null pointer... yuck...
249 * if it was a call to null, the return EIP should be
250 * available at SS:ESP, so let's try to retrieve it */
253 if (DEBUG_READ_MEM((void *)DEBUG_ToLinear(&tmp), &code.off, sizeof(code.off))) {
254 DEBUG_ForceFrame( &addr, &code, ++frameno, MODE_32, noisy, ", null call assumed" );
262 code.off = LOWORD(ctx.Eip);
264 addr.off = LOWORD(ctx.Ebp);
265 DEBUG_ForceFrame( &addr, &code, frameno, MODE_16, noisy, NULL );
269 if (noisy) DEBUG_Printf( DBG_CHN_MESG, "Bad segment '%x'\n", ss);
273 /* cur_switch holds address of curr_stack's field in TEB in debuggee
276 cur_switch = (DWORD)thread->teb + OFFSET_OF(TEB, cur_stack);
277 if (!DEBUG_READ_MEM((void*)cur_switch, &next_switch, sizeof(next_switch))) {
278 if (noisy) DEBUG_Printf( DBG_CHN_MESG, "Can't read TEB:cur_stack\n");
283 if (!DEBUG_READ_MEM((void*)next_switch, &frame32, sizeof(STACK32FRAME))) {
284 if (noisy) DEBUG_Printf( DBG_CHN_MESG, "Bad stack frame 0x%08lx\n",
285 (unsigned long)(STACK32FRAME*)next_switch );
288 cur_switch = (DWORD)frame32.frame16;
289 sw_addr.seg = SELECTOROF(cur_switch);
290 sw_addr.off = OFFSETOF(cur_switch);
292 tmp.seg = SELECTOROF(next_switch);
293 tmp.off = OFFSETOF(next_switch);
294 p = DEBUG_ToLinear(&tmp);
296 if (!DEBUG_READ_MEM((void*)p, &frame16, sizeof(STACK16FRAME))) {
297 if (noisy) DEBUG_Printf( DBG_CHN_MESG, "Bad stack frame 0x%08lx\n",
298 (unsigned long)(STACK16FRAME*)p );
301 cur_switch = (DWORD)frame16.frame32;
303 sw_addr.off = cur_switch;
305 if (!DEBUG_READ_MEM((void*)DEBUG_ToLinear(&sw_addr), &ch, sizeof(ch))) {
306 sw_addr.seg = (DWORD)-1;
307 sw_addr.off = (DWORD)-1;
310 for (ok = TRUE; ok;) {
311 if ((frames[frameno].ss == sw_addr.seg) &&
312 sw_addr.off && (frames[frameno].ebp >= sw_addr.off))
315 * yes, I know this is confusing, it gave me a headache too */
318 if (!DEBUG_READ_MEM((void*)next_switch, &frame32, sizeof(STACK32FRAME))) {
319 if (noisy) DEBUG_Printf( DBG_CHN_MESG, "Bad stack frame 0x%08lx\n",
320 (unsigned long)(STACK32FRAME*)next_switch );
325 code.off = frame32.retaddr;
329 addr.off = frame32.ebp;
330 DEBUG_ForceFrame( &addr, &code, ++frameno, MODE_32, noisy, NULL );
332 next_switch = cur_switch;
333 tmp.seg = SELECTOROF(next_switch);
334 tmp.off = OFFSETOF(next_switch);
335 p = DEBUG_ToLinear(&tmp);
337 if (!DEBUG_READ_MEM((void*)p, &frame16, sizeof(STACK16FRAME))) {
338 if (noisy) DEBUG_Printf( DBG_CHN_MESG, "Bad stack frame 0x%08lx\n",
339 (unsigned long)(STACK16FRAME*)p );
342 cur_switch = (DWORD)frame16.frame32;
344 sw_addr.off = cur_switch;
348 tmp.seg = SELECTOROF(next_switch);
349 tmp.off = OFFSETOF(next_switch);
350 p = DEBUG_ToLinear(&tmp);
352 if (!DEBUG_READ_MEM((void*)p, &frame16, sizeof(STACK16FRAME))) {
353 if (noisy) DEBUG_Printf( DBG_CHN_MESG, "Bad stack frame 0x%08lx\n",
354 (unsigned long)(STACK16FRAME*)p );
358 code.seg = frame16.cs;
359 code.off = frame16.ip;
362 addr.seg = SELECTOROF(next_switch);
363 addr.off = frame16.bp;
364 DEBUG_ForceFrame( &addr, &code, ++frameno, MODE_16, noisy, NULL );
366 next_switch = cur_switch;
367 if (!DEBUG_READ_MEM((void*)next_switch, &frame32, sizeof(STACK32FRAME))) {
368 if (noisy) DEBUG_Printf( DBG_CHN_MESG, "Bad stack frame 0x%08lx\n",
369 (unsigned long)(STACK32FRAME*)next_switch );
372 cur_switch = (DWORD)frame32.frame16;
373 sw_addr.seg = SELECTOROF(cur_switch);
374 sw_addr.off = OFFSETOF(cur_switch);
378 if (!DEBUG_READ_MEM((void*)DEBUG_ToLinear(&sw_addr), &ch, sizeof(ch))) {
379 sw_addr.seg = (DWORD)-1;
380 sw_addr.off = (DWORD)-1;
383 /* ordinary stack frame */
384 ok = is16 ? DEBUG_Frame16( thread, &addr, &cs, ++frameno, noisy)
385 : DEBUG_Frame32( &addr, &cs, ++frameno, noisy);
388 if (noisy) DEBUG_Printf( DBG_CHN_MESG, "\n" );
390 if (tid != DEBUG_CurrTid)
392 ResumeThread( thread->handle );
393 /* restore stack frame for current thread */
394 if (frames) DBG_free( frames );
395 frames = copy_frames;
396 nframe = copy_nframe;
397 curr_frame = copy_curr_frame;
403 DEBUG_SetFrame(int newframe)
408 curr_frame = newframe;
410 if( curr_frame >= nframe )
412 curr_frame = nframe - 1;
420 if( frames && frames[curr_frame].frame.list.sourcefile != NULL )
422 DEBUG_List(&frames[curr_frame].frame.list, NULL, 0);
429 #endif /* __i386__ */
433 DEBUG_GetCurrentFrame(struct name_hash ** name, unsigned int * eip,
438 * If we don't have a valid backtrace, then just return.
446 * If we don't know what the current function is, then we also have
447 * nothing to report here.
449 if( frames[curr_frame].frame.sym == NULL )
454 *name = frames[curr_frame].frame.sym;
455 *eip = frames[curr_frame].eip;
456 *ebp = frames[curr_frame].ebp;
461 #endif /* __i386__ */