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;
51 /***********************************************************************
54 * Dump the top of the stack
56 void DEBUG_InfoStack(void)
62 value.cookie = DV_TARGET;
63 value.addr.seg = DEBUG_context.SegSs;
64 value.addr.off = DEBUG_context.Esp;
66 DEBUG_Printf(DBG_CHN_MESG,"Stack dump:\n");
67 switch (DEBUG_GetSelectorType(value.addr.seg)) {
68 case 32: /* 32-bit mode */
69 DEBUG_ExamineMemory( &value, 24, 'x' );
71 case 16: /* 16-bit mode */
72 value.addr.off &= 0xffff;
73 DEBUG_ExamineMemory( &value, 24, 'w' );
76 DEBUG_Printf(DBG_CHN_MESG, "Bad segment (%ld)\n", value.addr.seg);
78 DEBUG_Printf(DBG_CHN_MESG,"\n");
83 static void DEBUG_ForceFrame(DBG_ADDR *stack, DBG_ADDR *code, int frameno, int bits, int noisy)
85 int theframe = nframe++;
86 frames = (struct bt_info *)DBG_realloc(frames,
87 nframe*sizeof(struct bt_info));
89 DEBUG_Printf(DBG_CHN_MESG,"%s%d ", (theframe == curr_frame ? "=>" : " "),
91 frames[theframe].cs = code->seg;
92 frames[theframe].eip = code->off;
94 frames[theframe].frame = DEBUG_PrintAddressAndArgs( code, bits,
97 DEBUG_FindNearestSymbol( code, TRUE,
98 &frames[theframe].frame.sym, stack->off,
99 &frames[theframe].frame.list);
100 frames[theframe].ss = stack->seg;
101 frames[theframe].ebp = stack->off;
103 DEBUG_Printf( DBG_CHN_MESG, (bits == 16) ? " (bp=%04lx)\n" : " (ebp=%08lx)\n", stack->off );
107 static BOOL DEBUG_Frame16(DBG_ADDR *addr, unsigned int *cs, int frameno, int noisy)
109 unsigned int ss = addr->seg, possible_cs = 0;
111 int theframe = nframe;
112 void* p = (void*)DEBUG_ToLinear(addr);
114 if (!p) return FALSE;
116 if (!DEBUG_READ_MEM(p, &frame, sizeof(frame))) {
117 if (noisy) DEBUG_InvalAddr(addr);
120 if (!frame.bp) return FALSE;
122 frames = (struct bt_info *)DBG_realloc(frames,
123 nframe*sizeof(struct bt_info));
125 DEBUG_Printf(DBG_CHN_MESG,"%s%d ", (theframe == curr_frame ? "=>" : " "),
127 if (frame.bp & 1) *cs = frame.cs;
129 /* not explicitly marked as far call,
130 * but check whether it could be anyway */
131 if (((frame.cs&7)==7) && (frame.cs != *cs)) {
134 if (GetThreadSelectorEntry( DEBUG_CurrThread->handle, frame.cs, &le) &&
135 (le.HighWord.Bits.Type & 0x08)) { /* code segment */
136 /* it is very uncommon to push a code segment cs as
137 * a parameter, so this should work in most cases */
138 *cs = possible_cs = frame.cs;
142 frames[theframe].cs = addr->seg = *cs;
143 frames[theframe].eip = addr->off = frame.ip;
145 frames[theframe].frame = DEBUG_PrintAddressAndArgs( addr, 16,
148 DEBUG_FindNearestSymbol( addr, TRUE,
149 &frames[theframe].frame.sym, frame.bp,
150 &frames[theframe].frame.list);
151 frames[theframe].ss = addr->seg = ss;
152 frames[theframe].ebp = addr->off = frame.bp & ~1;
154 DEBUG_Printf( DBG_CHN_MESG, " (bp=%04lx", addr->off );
156 DEBUG_Printf( DBG_CHN_MESG, ", far call assumed" );
158 DEBUG_Printf( DBG_CHN_MESG, ")\n" );
163 static BOOL DEBUG_Frame32(DBG_ADDR *addr, unsigned int *cs, int frameno, int noisy)
165 unsigned int ss = addr->seg;
167 int theframe = nframe;
168 void* p = (void*)DEBUG_ToLinear(addr);
170 if (!p) return FALSE;
172 if (!DEBUG_READ_MEM(p, &frame, sizeof(frame))) {
173 if (noisy) DEBUG_InvalAddr(addr);
176 if (!frame.ip) return FALSE;
179 frames = (struct bt_info *)DBG_realloc(frames,
180 nframe*sizeof(struct bt_info));
182 DEBUG_Printf(DBG_CHN_MESG,"%s%d ", (theframe == curr_frame ? "=>" : " "),
184 frames[theframe].cs = addr->seg = *cs;
185 frames[theframe].eip = addr->off = frame.ip;
187 frames[theframe].frame = DEBUG_PrintAddressAndArgs( addr, 32,
190 DEBUG_FindNearestSymbol( addr, TRUE,
191 &frames[theframe].frame.sym, frame.bp,
192 &frames[theframe].frame.list);
193 if (noisy) DEBUG_Printf( DBG_CHN_MESG, " (ebp=%08lx)\n", frame.bp );
194 frames[theframe].ss = addr->seg = ss;
195 frames[theframe].ebp = frame.bp;
196 if (addr->off == frame.bp) return FALSE;
197 addr->off = frame.bp;
203 /***********************************************************************
206 * Display a stack back-trace.
208 void DEBUG_BackTrace(BOOL noisy)
211 DBG_ADDR addr, sw_addr, code, tmp;
212 unsigned int ss = DEBUG_context.SegSs;
213 unsigned int cs = DEBUG_context.SegCs;
214 int frameno = 0, is16, ok;
215 DWORD next_switch, cur_switch, p;
216 STACK16FRAME frame16;
217 STACK32FRAME frame32;
220 if (noisy) DEBUG_Printf( DBG_CHN_MESG, "Backtrace:\n" );
223 if (frames) DBG_free( frames );
224 frames = (struct bt_info *) DBG_alloc( sizeof(struct bt_info) );
226 DEBUG_Printf(DBG_CHN_MESG,"%s%d ",(curr_frame == 0 ? "=>" : " "), frameno);
228 if (DEBUG_IsSelectorSystem(ss)) ss = 0;
229 if (DEBUG_IsSelectorSystem(cs)) cs = 0;
231 /* first stack frame from registers */
232 switch (DEBUG_GetSelectorType(ss))
235 frames[0].cs = addr.seg = cs;
236 frames[0].eip = addr.off = DEBUG_context.Eip;
238 frames[0].frame = DEBUG_PrintAddress( &addr, 32, TRUE );
240 DEBUG_FindNearestSymbol( &addr, TRUE, &frames[0].frame.sym, 0,
241 &frames[0].frame.list);
242 frames[0].ss = addr.seg = ss;
243 frames[0].ebp = addr.off = DEBUG_context.Ebp;
244 if (noisy) DEBUG_Printf( DBG_CHN_MESG, " (ebp=%08x)\n", frames[0].ebp );
248 frames[0].cs = addr.seg = cs;
249 frames[0].eip = addr.off = LOWORD(DEBUG_context.Eip);
251 frames[0].frame = DEBUG_PrintAddress( &addr, 16, TRUE );
253 DEBUG_FindNearestSymbol( &addr, TRUE, &frames[0].frame.sym, 0,
254 &frames[0].frame.list);
255 frames[0].ss = addr.seg = ss;
256 frames[0].ebp = addr.off = LOWORD(DEBUG_context.Ebp);
257 if (noisy) DEBUG_Printf( DBG_CHN_MESG, " (bp=%04x)\n", frames[0].ebp );
261 if (noisy) DEBUG_Printf( DBG_CHN_MESG, "Bad segment '%u'\n", ss);
265 /* cur_switch holds address of curr_stack's field in TEB in debuggee
268 cur_switch = (DWORD)DEBUG_CurrThread->teb + OFFSET_OF(TEB, cur_stack);
269 if (!DEBUG_READ_MEM((void*)cur_switch, &next_switch, sizeof(next_switch))) {
270 if (noisy) DEBUG_Printf( DBG_CHN_MESG, "Can't read TEB:cur_stack\n");
275 if (!DEBUG_READ_MEM((void*)next_switch, &frame32, sizeof(STACK32FRAME))) {
276 if (noisy) DEBUG_Printf( DBG_CHN_MESG, "Bad stack frame 0x%08lx\n",
277 (unsigned long)(STACK32FRAME*)next_switch );
280 cur_switch = (DWORD)frame32.frame16;
281 sw_addr.seg = SELECTOROF(cur_switch);
282 sw_addr.off = OFFSETOF(cur_switch);
284 tmp.seg = SELECTOROF(next_switch);
285 tmp.off = OFFSETOF(next_switch);
286 p = DEBUG_ToLinear(&tmp);
288 if (!DEBUG_READ_MEM((void*)p, &frame16, sizeof(STACK16FRAME))) {
289 if (noisy) DEBUG_Printf( DBG_CHN_MESG, "Bad stack frame 0x%08lx\n",
290 (unsigned long)(STACK16FRAME*)p );
293 cur_switch = (DWORD)frame16.frame32;
295 sw_addr.off = cur_switch;
297 if (!DEBUG_READ_MEM((void*)DEBUG_ToLinear(&sw_addr), &ch, sizeof(ch))) {
298 sw_addr.seg = (DWORD)-1;
299 sw_addr.off = (DWORD)-1;
302 for (ok = TRUE; ok;) {
303 if ((frames[frameno].ss == sw_addr.seg) &&
304 (frames[frameno].ebp >= sw_addr.off)) {
306 * yes, I know this is confusing, it gave me a headache too */
309 if (!DEBUG_READ_MEM((void*)next_switch, &frame32, sizeof(STACK32FRAME))) {
310 if (noisy) DEBUG_Printf( DBG_CHN_MESG, "Bad stack frame 0x%08lx\n",
311 (unsigned long)(STACK32FRAME*)next_switch );
316 code.off = frame32.retaddr;
320 addr.off = frame32.ebp;
321 DEBUG_ForceFrame( &addr, &code, ++frameno, 32, noisy );
323 next_switch = cur_switch;
324 tmp.seg = SELECTOROF(next_switch);
325 tmp.off = OFFSETOF(next_switch);
326 p = DEBUG_ToLinear(&tmp);
328 if (!DEBUG_READ_MEM((void*)p, &frame16, sizeof(STACK16FRAME))) {
329 if (noisy) DEBUG_Printf( DBG_CHN_MESG, "Bad stack frame 0x%08lx\n",
330 (unsigned long)(STACK16FRAME*)p );
333 cur_switch = (DWORD)frame16.frame32;
335 sw_addr.off = cur_switch;
339 tmp.seg = SELECTOROF(next_switch);
340 tmp.off = OFFSETOF(next_switch);
341 p = DEBUG_ToLinear(&tmp);
343 if (!DEBUG_READ_MEM((void*)p, &frame16, sizeof(STACK16FRAME))) {
344 if (noisy) DEBUG_Printf( DBG_CHN_MESG, "Bad stack frame 0x%08lx\n",
345 (unsigned long)(STACK16FRAME*)p );
349 code.seg = frame16.cs;
350 code.off = frame16.ip;
353 addr.seg = SELECTOROF(next_switch);
354 addr.off = frame16.bp;
355 DEBUG_ForceFrame( &addr, &code, ++frameno, 16, noisy );
357 next_switch = cur_switch;
358 if (!DEBUG_READ_MEM((void*)next_switch, &frame32, sizeof(STACK32FRAME))) {
359 if (noisy) DEBUG_Printf( DBG_CHN_MESG, "Bad stack frame 0x%08lx\n",
360 (unsigned long)(STACK32FRAME*)next_switch );
363 cur_switch = (DWORD)frame32.frame16;
364 sw_addr.seg = SELECTOROF(cur_switch);
365 sw_addr.off = OFFSETOF(cur_switch);
369 if (!DEBUG_READ_MEM((void*)DEBUG_ToLinear(&sw_addr), &ch, sizeof(ch))) {
370 sw_addr.seg = (DWORD)-1;
371 sw_addr.off = (DWORD)-1;
374 /* ordinary stack frame */
375 ok = is16 ? DEBUG_Frame16( &addr, &cs, ++frameno, noisy)
376 : DEBUG_Frame32( &addr, &cs, ++frameno, noisy);
379 if (noisy) DEBUG_Printf( DBG_CHN_MESG, "\n" );
384 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);
410 DEBUG_GetCurrentFrame(struct name_hash ** name, unsigned int * eip,
414 * If we don't have a valid backtrace, then just return.
422 * If we don't know what the current function is, then we also have
423 * nothing to report here.
425 if( frames[curr_frame].frame.sym == NULL )
430 *name = frames[curr_frame].frame.sym;
431 *eip = frames[curr_frame].eip;
432 *ebp = frames[curr_frame].ebp;