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)) {
67 case 32: /* 32-bit mode */
68 DEBUG_ExamineMemory( &value, 24, 'x' );
70 case 16: /* 16-bit mode */
71 value.addr.off &= 0xffff;
72 DEBUG_ExamineMemory( &value, 24, 'w' );
75 DEBUG_Printf(DBG_CHN_MESG, "Bad segment (%ld)\n", value.addr.seg);
77 DEBUG_Printf(DBG_CHN_MESG,"\n");
82 static void DEBUG_ForceFrame(DBG_ADDR *stack, DBG_ADDR *code, int frameno, int bits, int noisy)
84 int theframe = nframe++;
85 frames = (struct bt_info *)DBG_realloc(frames,
86 nframe*sizeof(struct bt_info));
88 DEBUG_Printf(DBG_CHN_MESG,"%s%d ", (theframe == curr_frame ? "=>" : " "),
90 frames[theframe].cs = code->seg;
91 frames[theframe].eip = code->off;
93 frames[theframe].frame = DEBUG_PrintAddressAndArgs( code, bits,
96 DEBUG_FindNearestSymbol( code, TRUE,
97 &frames[theframe].frame.sym, stack->off,
98 &frames[theframe].frame.list);
99 frames[theframe].ss = stack->seg;
100 frames[theframe].ebp = stack->off;
102 DEBUG_Printf( DBG_CHN_MESG, (bits == 16) ? " (bp=%04lx)\n" : " (ebp=%08lx)\n", stack->off );
106 static BOOL DEBUG_Frame16(DBG_ADDR *addr, unsigned int *cs, int frameno, int noisy)
108 unsigned int ss = addr->seg, possible_cs = 0;
110 int theframe = nframe;
111 void* p = (void*)DEBUG_ToLinear(addr);
113 if (!p) return FALSE;
115 if (!DEBUG_READ_MEM(p, &frame, sizeof(frame))) {
116 if (noisy) DEBUG_InvalAddr(addr);
119 if (!frame.bp) return FALSE;
121 frames = (struct bt_info *)DBG_realloc(frames,
122 nframe*sizeof(struct bt_info));
124 DEBUG_Printf(DBG_CHN_MESG,"%s%d ", (theframe == curr_frame ? "=>" : " "),
126 if (frame.bp & 1) *cs = frame.cs;
128 /* not explicitly marked as far call,
129 * but check whether it could be anyway */
130 if (((frame.cs&7)==7) && (frame.cs != *cs)) {
133 if (GetThreadSelectorEntry( DEBUG_CurrThread->handle, frame.cs, &le) &&
134 (le.HighWord.Bits.Type & 0x08)) { /* code segment */
135 /* it is very uncommon to push a code segment cs as
136 * a parameter, so this should work in most cases */
137 *cs = possible_cs = frame.cs;
141 frames[theframe].cs = addr->seg = *cs;
142 frames[theframe].eip = addr->off = frame.ip;
144 frames[theframe].frame = DEBUG_PrintAddressAndArgs( addr, 16,
147 DEBUG_FindNearestSymbol( addr, TRUE,
148 &frames[theframe].frame.sym, frame.bp,
149 &frames[theframe].frame.list);
150 frames[theframe].ss = addr->seg = ss;
151 frames[theframe].ebp = addr->off = frame.bp & ~1;
153 DEBUG_Printf( DBG_CHN_MESG, " (bp=%04lx", addr->off );
155 DEBUG_Printf( DBG_CHN_MESG, ", far call assumed" );
157 DEBUG_Printf( DBG_CHN_MESG, ")\n" );
162 static BOOL DEBUG_Frame32(DBG_ADDR *addr, unsigned int *cs, int frameno, int noisy)
164 unsigned int ss = addr->seg;
166 int theframe = nframe;
167 void* p = (void*)DEBUG_ToLinear(addr);
169 if (!p) return FALSE;
171 if (!DEBUG_READ_MEM(p, &frame, sizeof(frame))) {
172 if (noisy) DEBUG_InvalAddr(addr);
175 if (!frame.ip) return FALSE;
178 frames = (struct bt_info *)DBG_realloc(frames,
179 nframe*sizeof(struct bt_info));
181 DEBUG_Printf(DBG_CHN_MESG,"%s%d ", (theframe == curr_frame ? "=>" : " "),
183 frames[theframe].cs = addr->seg = *cs;
184 frames[theframe].eip = addr->off = frame.ip;
186 frames[theframe].frame = DEBUG_PrintAddressAndArgs( addr, 32,
189 DEBUG_FindNearestSymbol( addr, TRUE,
190 &frames[theframe].frame.sym, frame.bp,
191 &frames[theframe].frame.list);
192 if (noisy) DEBUG_Printf( DBG_CHN_MESG, " (ebp=%08lx)\n", frame.bp );
193 frames[theframe].ss = addr->seg = ss;
194 frames[theframe].ebp = frame.bp;
195 if (addr->off == frame.bp) return FALSE;
196 addr->off = frame.bp;
202 /***********************************************************************
205 * Display a stack back-trace.
207 void DEBUG_BackTrace(BOOL noisy)
210 DBG_ADDR addr, sw_addr, code, tmp;
211 unsigned int ss = DEBUG_context.SegSs;
212 unsigned int cs = DEBUG_context.SegCs;
213 int frameno = 0, is16, ok;
214 DWORD next_switch, cur_switch, p;
215 STACK16FRAME frame16;
216 STACK32FRAME frame32;
219 if (noisy) DEBUG_Printf( DBG_CHN_MESG, "Backtrace:\n" );
222 if (frames) DBG_free( frames );
223 frames = (struct bt_info *) DBG_alloc( sizeof(struct bt_info) );
225 DEBUG_Printf(DBG_CHN_MESG,"%s%d ",(curr_frame == 0 ? "=>" : " "), frameno);
227 if (DEBUG_IsSelectorSystem(ss)) ss = 0;
228 if (DEBUG_IsSelectorSystem(cs)) cs = 0;
230 /* first stack frame from registers */
231 switch (DEBUG_GetSelectorType(ss))
234 frames[0].cs = addr.seg = cs;
235 frames[0].eip = addr.off = DEBUG_context.Eip;
237 frames[0].frame = DEBUG_PrintAddress( &addr, 32, TRUE );
239 DEBUG_FindNearestSymbol( &addr, TRUE, &frames[0].frame.sym, 0,
240 &frames[0].frame.list);
241 frames[0].ss = addr.seg = ss;
242 frames[0].ebp = addr.off = DEBUG_context.Ebp;
243 if (noisy) DEBUG_Printf( DBG_CHN_MESG, " (ebp=%08x)\n", frames[0].ebp );
247 frames[0].cs = addr.seg = cs;
248 frames[0].eip = addr.off = LOWORD(DEBUG_context.Eip);
250 frames[0].frame = DEBUG_PrintAddress( &addr, 16, TRUE );
252 DEBUG_FindNearestSymbol( &addr, TRUE, &frames[0].frame.sym, 0,
253 &frames[0].frame.list);
254 frames[0].ss = addr.seg = ss;
255 frames[0].ebp = addr.off = LOWORD(DEBUG_context.Ebp);
256 if (noisy) DEBUG_Printf( DBG_CHN_MESG, " (bp=%04x)\n", frames[0].ebp );
260 if (noisy) DEBUG_Printf( DBG_CHN_MESG, "Bad segment '%u'\n", ss);
264 /* cur_switch holds address of curr_stack's field in TEB in debuggee
267 cur_switch = (DWORD)DEBUG_CurrThread->teb + OFFSET_OF(TEB, cur_stack);
268 if (!DEBUG_READ_MEM((void*)cur_switch, &next_switch, sizeof(next_switch))) {
269 if (noisy) DEBUG_Printf( DBG_CHN_MESG, "Can't read TEB:cur_stack\n");
274 if (!DEBUG_READ_MEM((void*)next_switch, &frame32, sizeof(STACK32FRAME))) {
275 if (noisy) DEBUG_Printf( DBG_CHN_MESG, "Bad stack frame 0x%08lx\n",
276 (unsigned long)(STACK32FRAME*)next_switch );
279 cur_switch = (DWORD)frame32.frame16;
280 sw_addr.seg = SELECTOROF(cur_switch);
281 sw_addr.off = OFFSETOF(cur_switch);
283 tmp.seg = SELECTOROF(next_switch);
284 tmp.off = OFFSETOF(next_switch);
285 p = DEBUG_ToLinear(&tmp);
287 if (!DEBUG_READ_MEM((void*)p, &frame16, sizeof(STACK16FRAME))) {
288 if (noisy) DEBUG_Printf( DBG_CHN_MESG, "Bad stack frame 0x%08lx\n",
289 (unsigned long)(STACK16FRAME*)p );
292 cur_switch = (DWORD)frame16.frame32;
294 sw_addr.off = cur_switch;
296 if (!DEBUG_READ_MEM((void*)DEBUG_ToLinear(&sw_addr), &ch, sizeof(ch))) {
297 sw_addr.seg = (DWORD)-1;
298 sw_addr.off = (DWORD)-1;
301 for (ok = TRUE; ok;) {
302 if ((frames[frameno].ss == sw_addr.seg) &&
303 (frames[frameno].ebp >= sw_addr.off)) {
305 * yes, I know this is confusing, it gave me a headache too */
308 if (!DEBUG_READ_MEM((void*)next_switch, &frame32, sizeof(STACK32FRAME))) {
309 if (noisy) DEBUG_Printf( DBG_CHN_MESG, "Bad stack frame 0x%08lx\n",
310 (unsigned long)(STACK32FRAME*)next_switch );
315 code.off = frame32.retaddr;
319 addr.off = frame32.ebp;
320 DEBUG_ForceFrame( &addr, &code, ++frameno, 32, noisy );
322 next_switch = cur_switch;
323 tmp.seg = SELECTOROF(next_switch);
324 tmp.off = OFFSETOF(next_switch);
325 p = DEBUG_ToLinear(&tmp);
327 if (!DEBUG_READ_MEM((void*)p, &frame16, sizeof(STACK16FRAME))) {
328 if (noisy) DEBUG_Printf( DBG_CHN_MESG, "Bad stack frame 0x%08lx\n",
329 (unsigned long)(STACK16FRAME*)p );
332 cur_switch = (DWORD)frame16.frame32;
334 sw_addr.off = cur_switch;
338 tmp.seg = SELECTOROF(next_switch);
339 tmp.off = OFFSETOF(next_switch);
340 p = DEBUG_ToLinear(&tmp);
342 if (!DEBUG_READ_MEM((void*)p, &frame16, sizeof(STACK16FRAME))) {
343 if (noisy) DEBUG_Printf( DBG_CHN_MESG, "Bad stack frame 0x%08lx\n",
344 (unsigned long)(STACK16FRAME*)p );
348 code.seg = frame16.cs;
349 code.off = frame16.ip;
352 addr.seg = SELECTOROF(next_switch);
353 addr.off = frame16.bp;
354 DEBUG_ForceFrame( &addr, &code, ++frameno, 16, noisy );
356 next_switch = cur_switch;
357 if (!DEBUG_READ_MEM((void*)next_switch, &frame32, sizeof(STACK32FRAME))) {
358 if (noisy) DEBUG_Printf( DBG_CHN_MESG, "Bad stack frame 0x%08lx\n",
359 (unsigned long)(STACK32FRAME*)next_switch );
362 cur_switch = (DWORD)frame32.frame16;
363 sw_addr.seg = SELECTOROF(cur_switch);
364 sw_addr.off = OFFSETOF(cur_switch);
368 if (!DEBUG_READ_MEM((void*)DEBUG_ToLinear(&sw_addr), &ch, sizeof(ch))) {
369 sw_addr.seg = (DWORD)-1;
370 sw_addr.off = (DWORD)-1;
373 /* ordinary stack frame */
374 ok = is16 ? DEBUG_Frame16( &addr, &cs, ++frameno, noisy)
375 : DEBUG_Frame32( &addr, &cs, ++frameno, noisy);
378 if (noisy) DEBUG_Printf( DBG_CHN_MESG, "\n" );
383 DEBUG_SetFrame(int newframe)
388 curr_frame = newframe;
390 if( curr_frame >= nframe )
392 curr_frame = nframe - 1;
400 if( frames && frames[curr_frame].frame.list.sourcefile != NULL )
402 DEBUG_List(&frames[curr_frame].frame.list, NULL, 0);
409 #endif /* __i386__ */
413 DEBUG_GetCurrentFrame(struct name_hash ** name, unsigned int * eip,
418 * If we don't have a valid backtrace, then just return.
426 * If we don't know what the current function is, then we also have
427 * nothing to report here.
429 if( frames[curr_frame].frame.sym == NULL )
434 *name = frames[curr_frame].frame.sym;
435 *eip = frames[curr_frame].eip;
436 *ebp = frames[curr_frame].ebp;
441 #endif /* __i386__ */