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_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( DEBUG_CurrThread->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(BOOL noisy)
180 DBG_ADDR addr, sw_addr, code, tmp;
181 unsigned int ss = DEBUG_context.SegSs;
182 unsigned int cs = DEBUG_context.SegCs;
183 int frameno = 0, is16, ok;
184 DWORD next_switch, cur_switch, p;
185 STACK16FRAME frame16;
186 STACK32FRAME frame32;
189 if (noisy) DEBUG_Printf( DBG_CHN_MESG, "Backtrace:\n" );
192 if (frames) DBG_free( frames );
193 /* frames = (struct bt_info *) DBG_alloc( sizeof(struct bt_info) ); */
196 if (DEBUG_IsSelectorSystem(ss)) ss = 0;
197 if (DEBUG_IsSelectorSystem(cs)) cs = 0;
199 /* first stack frame from registers */
200 switch (DEBUG_GetSelectorType(ss))
204 code.off = DEBUG_context.Eip;
206 addr.off = DEBUG_context.Ebp;
207 DEBUG_ForceFrame( &addr, &code, frameno, MODE_32, noisy, NULL );
208 if (!(code.seg || code.off)) {
209 /* trying to execute a null pointer... yuck...
210 * if it was a call to null, the return EIP should be
211 * available at SS:ESP, so let's try to retrieve it */
213 tmp.off = DEBUG_context.Esp;
214 if (DEBUG_READ_MEM((void *)DEBUG_ToLinear(&tmp), &code.off, sizeof(code.off))) {
215 DEBUG_ForceFrame( &addr, &code, ++frameno, MODE_32, noisy, ", null call assumed" );
223 code.off = LOWORD(DEBUG_context.Eip);
225 addr.off = LOWORD(DEBUG_context.Ebp);
226 DEBUG_ForceFrame( &addr, &code, frameno, MODE_16, noisy, NULL );
230 if (noisy) DEBUG_Printf( DBG_CHN_MESG, "Bad segment '%x'\n", ss);
234 /* cur_switch holds address of curr_stack's field in TEB in debuggee
237 cur_switch = (DWORD)DEBUG_CurrThread->teb + OFFSET_OF(TEB, cur_stack);
238 if (!DEBUG_READ_MEM((void*)cur_switch, &next_switch, sizeof(next_switch))) {
239 if (noisy) DEBUG_Printf( DBG_CHN_MESG, "Can't read TEB:cur_stack\n");
244 if (!DEBUG_READ_MEM((void*)next_switch, &frame32, sizeof(STACK32FRAME))) {
245 if (noisy) DEBUG_Printf( DBG_CHN_MESG, "Bad stack frame 0x%08lx\n",
246 (unsigned long)(STACK32FRAME*)next_switch );
249 cur_switch = (DWORD)frame32.frame16;
250 sw_addr.seg = SELECTOROF(cur_switch);
251 sw_addr.off = OFFSETOF(cur_switch);
253 tmp.seg = SELECTOROF(next_switch);
254 tmp.off = OFFSETOF(next_switch);
255 p = DEBUG_ToLinear(&tmp);
257 if (!DEBUG_READ_MEM((void*)p, &frame16, sizeof(STACK16FRAME))) {
258 if (noisy) DEBUG_Printf( DBG_CHN_MESG, "Bad stack frame 0x%08lx\n",
259 (unsigned long)(STACK16FRAME*)p );
262 cur_switch = (DWORD)frame16.frame32;
264 sw_addr.off = cur_switch;
266 if (!DEBUG_READ_MEM((void*)DEBUG_ToLinear(&sw_addr), &ch, sizeof(ch))) {
267 sw_addr.seg = (DWORD)-1;
268 sw_addr.off = (DWORD)-1;
271 for (ok = TRUE; ok;) {
272 if ((frames[frameno].ss == sw_addr.seg) &&
273 (frames[frameno].ebp >= sw_addr.off)) {
275 * yes, I know this is confusing, it gave me a headache too */
278 if (!DEBUG_READ_MEM((void*)next_switch, &frame32, sizeof(STACK32FRAME))) {
279 if (noisy) DEBUG_Printf( DBG_CHN_MESG, "Bad stack frame 0x%08lx\n",
280 (unsigned long)(STACK32FRAME*)next_switch );
285 code.off = frame32.retaddr;
289 addr.off = frame32.ebp;
290 DEBUG_ForceFrame( &addr, &code, ++frameno, MODE_32, noisy, NULL );
292 next_switch = cur_switch;
293 tmp.seg = SELECTOROF(next_switch);
294 tmp.off = OFFSETOF(next_switch);
295 p = DEBUG_ToLinear(&tmp);
297 if (!DEBUG_READ_MEM((void*)p, &frame16, sizeof(STACK16FRAME))) {
298 if (noisy) DEBUG_Printf( DBG_CHN_MESG, "Bad stack frame 0x%08lx\n",
299 (unsigned long)(STACK16FRAME*)p );
302 cur_switch = (DWORD)frame16.frame32;
304 sw_addr.off = cur_switch;
308 tmp.seg = SELECTOROF(next_switch);
309 tmp.off = OFFSETOF(next_switch);
310 p = DEBUG_ToLinear(&tmp);
312 if (!DEBUG_READ_MEM((void*)p, &frame16, sizeof(STACK16FRAME))) {
313 if (noisy) DEBUG_Printf( DBG_CHN_MESG, "Bad stack frame 0x%08lx\n",
314 (unsigned long)(STACK16FRAME*)p );
318 code.seg = frame16.cs;
319 code.off = frame16.ip;
322 addr.seg = SELECTOROF(next_switch);
323 addr.off = frame16.bp;
324 DEBUG_ForceFrame( &addr, &code, ++frameno, MODE_16, noisy, NULL );
326 next_switch = cur_switch;
327 if (!DEBUG_READ_MEM((void*)next_switch, &frame32, sizeof(STACK32FRAME))) {
328 if (noisy) DEBUG_Printf( DBG_CHN_MESG, "Bad stack frame 0x%08lx\n",
329 (unsigned long)(STACK32FRAME*)next_switch );
332 cur_switch = (DWORD)frame32.frame16;
333 sw_addr.seg = SELECTOROF(cur_switch);
334 sw_addr.off = OFFSETOF(cur_switch);
338 if (!DEBUG_READ_MEM((void*)DEBUG_ToLinear(&sw_addr), &ch, sizeof(ch))) {
339 sw_addr.seg = (DWORD)-1;
340 sw_addr.off = (DWORD)-1;
343 /* ordinary stack frame */
344 ok = is16 ? DEBUG_Frame16( &addr, &cs, ++frameno, noisy)
345 : DEBUG_Frame32( &addr, &cs, ++frameno, noisy);
348 if (noisy) DEBUG_Printf( DBG_CHN_MESG, "\n" );
353 DEBUG_SetFrame(int newframe)
358 curr_frame = newframe;
360 if( curr_frame >= nframe )
362 curr_frame = nframe - 1;
370 if( frames && frames[curr_frame].frame.list.sourcefile != NULL )
372 DEBUG_List(&frames[curr_frame].frame.list, NULL, 0);
379 #endif /* __i386__ */
383 DEBUG_GetCurrentFrame(struct name_hash ** name, unsigned int * eip,
388 * If we don't have a valid backtrace, then just return.
396 * If we don't know what the current function is, then we also have
397 * nothing to report here.
399 if( frames[curr_frame].frame.sym == NULL )
404 *name = frames[curr_frame].frame.sym;
405 *eip = frames[curr_frame].eip;
406 *ebp = frames[curr_frame].ebp;
411 #endif /* __i386__ */