DBGF.cpp@ 2229

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1	/* $Id: DBGF.cpp 2229 2007-04-19 13:54:51Z vboxsync $ */
2	/** @file
3	* VMM DBGF - Debugger Facility.
4	*/
5
6	/*
7	* Copyright (C) 2006 InnoTek Systemberatung GmbH
8	*
9	* This file is part of VirtualBox Open Source Edition (OSE), as
10	* available from http://www.virtualbox.org. This file is free software;
11	* you can redistribute it and/or modify it under the terms of the GNU
12	* General Public License as published by the Free Software Foundation,
13	* in version 2 as it comes in the "COPYING" file of the VirtualBox OSE
14	* distribution. VirtualBox OSE is distributed in the hope that it will
15	* be useful, but WITHOUT ANY WARRANTY of any kind.
16	*
17	* If you received this file as part of a commercial VirtualBox
18	* distribution, then only the terms of your commercial VirtualBox
19	* license agreement apply instead of the previous paragraph.
20	*/
21
22
23	/** @page pg_dbgf DBGC - The Debugger Facility
24	*
25	* The purpose of the DBGC is to provide an interface for debuggers to manipulate
26	* the VMM without having to mess up the source code for each of them. The DBGF
27	* is always built in and will always work when a debugger attaches to the VM.
28	* The DBGF provides the basic debugger features, such as halting execution,
29	* handling breakpoints and single step execution.
30	*
31	* The interface is working in a manner similar to the win32, linux and os2
32	* debugger interfaces. It interface has an asynchronous nature. This comes from
33	* the fact that the VMM and the Debugger are running in different threads.
34	* They are refered to as the "emulation thread" and the "debugger thread",
35	* or as the "ping thread" and the "pong thread, respectivly. (The last set
36	* of names comes from the use of the Ping-Pong synchronization construct from
37	* the RTSem API.)
38	*
39	*
40	*
41	* @section sec_dbgf_scenario Debugger Scenario
42	*
43	* The debugger starts by attaching to the VM. For pratical reasons we limit the
44	* number of concurrently attached debuggers to 1 per VM. The action of attaching
45	* to the VM causes the VM to check and generate debug events.
46	*
47	* The debugger then will wait/poll for debug events and issue commands.
48	*
49	* The waiting and polling is done by the DBGFEventWait() function. It will wait
50	* for the emulation thread to send a ping, thus indicating that there is an
51	* event waiting to be processed.
52	*
53	* An event can be a respons to an command issued previously, the hitting of a
54	* breakpoint, or running into a bad/fatal VMM condition. The debugger now have
55	* the ping and must respond to the event at hand - the VMM is waiting. This
56	* usually means that the user of the debugger must do something, but it doesn't
57	* have to. The debugger is free to call any DBGF function (nearly at least)
58	* while processing the event.
59	*
60	* Typically the user will issue a request for the execution to be resumed, so
61	* the debugger calls DBGFResume() and goes back to waiting/polling for events.
62	*
63	* When the user eventually terminates the debugging session or selects another
64	* VM, the debugger detaches from the VM. This means that breakpoints are disabled
65	* and that the emulation thread no longer polls for debugger commands.
66	*
67	*/
68
69
70
71	/*******************************************************************************
72	* Header Files *
73	*******************************************************************************/
74	#define LOG_GROUP LOG_GROUP_DBGF
75	#include <VBox/dbgf.h>
76	#include <VBox/selm.h>
77	#include <VBox/rem.h>
78	#include <VBox/em.h>
79	#include "DBGFInternal.h"
80	#include <VBox/vm.h>
81	#include <VBox/err.h>
82
83	#include <VBox/log.h>
84	#include <iprt/semaphore.h>
85	#include <iprt/thread.h>
86	#include <iprt/asm.h>
87	#include <iprt/time.h>
88	#include <iprt/assert.h>
89	#include <iprt/stream.h>
90
91
92	/*******************************************************************************
93	* Internal Functions *
94	*******************************************************************************/
95	static int dbgfr3VMMWait(PVM pVM);
96	static int dbgfr3VMMCmd(PVM pVM, DBGFCMD enmCmd, PDBGFCMDDATA pCmdData, bool *pfResumeExecution);
97
98
99	/**
100	* Sets the VMM Debug Command variable.
101	*
102	* @returns Previous command.
103	* @param pVM VM Handle.
104	* @param enmCmd The command.
105	*/
106	DECLINLINE(DBGFCMD) dbgfr3SetCmd(PVM pVM, DBGFCMD enmCmd)
107	{
108	DBGFCMD rc;
109	if (enmCmd == DBGFCMD_NO_COMMAND)
110	{
111	Log2(("DBGF: Setting command to %d (DBGFCMD_NO_COMMAND)\n", enmCmd));
112	rc = (DBGFCMD)ASMAtomicXchgU32((uint32_t volatile )(void )&pVM->dbgf.s.enmVMMCmd, enmCmd);
113	VM_FF_CLEAR(pVM, VM_FF_DBGF);
114	}
115	else
116	{
117	Log2(("DBGF: Setting command to %d\n", enmCmd));
118	AssertMsg(pVM->dbgf.s.enmVMMCmd == DBGFCMD_NO_COMMAND, ("enmCmd=%d enmVMMCmd=%d\n", enmCmd, pVM->dbgf.s.enmVMMCmd));
119	rc = (DBGFCMD)ASMAtomicXchgU32((uint32_t volatile )(void )&pVM->dbgf.s.enmVMMCmd, enmCmd);
120	VM_FF_SET(pVM, VM_FF_DBGF);
121	VMR3NotifyFF(pVM, false /* didn't notify REM */);
122	}
123	return rc;
124	}
125
126
127	/**
128	* Initializes the DBGF.
129	*
130	* @returns VBox status code.
131	* @param pVM VM handle.
132	*/
133	DBGFR3DECL(int) DBGFR3Init(PVM pVM)
134	{
135	int rc = dbgfR3InfoInit(pVM);
136	if (VBOX_SUCCESS(rc))
137	rc = dbgfR3SymInit(pVM);
138	if (VBOX_SUCCESS(rc))
139	rc = dbgfR3BpInit(pVM);
140	return rc;
141	}
142
143
144	/**
145	* Termiantes and cleans up resources allocated by the DBGF.
146	*
147	* @returns VBox status code.
148	* @param pVM VM Handle.
149	*/
150	DBGFR3DECL(int) DBGFR3Term(PVM pVM)
151	{
152	int rc;
153
154	/*
155	* Send a termination event to any attached debuggers.
156	*/
157	/* wait for any pending events or whatever */
158	if ( pVM->dbgf.s.fAttached
159	&& pVM->dbgf.s.PingPong.enmSpeaker == RTPINGPONGSPEAKER_PONG)
160	{
161	do rc = RTSemPingWait(&pVM->dbgf.s.PingPong, 5000);
162	while (pVM->dbgf.s.fAttached);
163	}
164
165	/* now, send the event */
166	if ( pVM->dbgf.s.fAttached
167	&& pVM->dbgf.s.PingPong.enmSpeaker != RTPINGPONGSPEAKER_PONG)
168	{
169	pVM->dbgf.s.DbgEvent.enmType = DBGFEVENT_TERMINATING;
170	pVM->dbgf.s.DbgEvent.enmCtx = DBGFEVENTCTX_OTHER;
171	rc = RTSemPing(&pVM->dbgf.s.PingPong);
172	if (VBOX_SUCCESS(rc))
173	{
174	/*
175	* Waits for the debugger to detach.
176	*/
177	while (pVM->dbgf.s.fAttached)
178	{
179	/*
180	* Wait.
181	*/
182	rc = RTSemPingWait(&pVM->dbgf.s.PingPong, 1000);
183
184	/*
185	* Process the command.
186	*/
187	DBGFCMDDATA CmdData = pVM->dbgf.s.VMMCmdData;
188	DBGFCMD enmCmd = dbgfr3SetCmd(pVM, DBGFCMD_NO_COMMAND);
189	if (enmCmd != DBGFCMD_NO_COMMAND)
190	{
191	bool fResumeExecution = false;
192	rc = dbgfr3VMMCmd(pVM, enmCmd, &CmdData, &fResumeExecution);
193	if (enmCmd == DBGFCMD_DETACH_DEBUGGER)
194	break;
195	}
196	else if (VBOX_FAILURE(rc))
197	break;
198	}
199	}
200	}
201
202	/*
203	* Terminate the other bits.
204	*/
205	dbgfR3InfoTerm(pVM);
206	return VINF_SUCCESS;
207	}
208
209
210	/**
211	* Applies relocations to data and code managed by this
212	* component. This function will be called at init and
213	* whenever the VMM need to relocate it self inside the GC.
214	*
215	* @param pVM VM handle.
216	* @param offDelta Relocation delta relative to old location.
217	*/
218	DBGFR3DECL(void) DBGFR3Relocate(PVM pVM, RTGCINTPTR offDelta)
219	{
220	}
221
222
223	/**
224	* Waits a little while for a debuggger to attach.
225	*
226	* @returns True is a debugger have attached.
227	* @param pVM VM handle.
228	* @param enmEvent Event.
229	*/
230	bool dbgfR3WaitForAttach(PVM pVM, DBGFEVENTTYPE enmEvent)
231	{
232	/*
233	* First a message.
234	*/
235	RTStrmPrintf(g_pStdErr, "DBGF: No debugger attached, waiting 15 seconds for one to attach (event=%d)\n", enmEvent);
236	RTStrmFlush(g_pStdErr);
237	#ifdef DEBUG_sandervl
238	int cWait = 10;
239	#else
240	int cWait = 150;
241	#endif
242	while (cWait > 0)
243	{
244	RTThreadSleep(100);
245	if (pVM->dbgf.s.fAttached)
246	{
247	RTStrmPrintf(g_pStdErr, "Attached!\n");
248	RTStrmFlush(g_pStdErr);
249	return true;
250	}
251
252	/* next */
253	if (!(cWait % 10))
254	{
255	RTStrmPrintf(g_pStdErr, "%d.", cWait / 10);
256	RTStrmFlush(g_pStdErr);
257	}
258	cWait--;
259	}
260
261	RTStrmPrintf(g_pStdErr, "Stopping the VM!\n");
262	RTStrmFlush(g_pStdErr);
263	return false;
264	}
265
266
267	/**
268	* Forced action callback.
269	* The VMM will call this from it's main loop when VM_FF_DBGF is set.
270	*
271	* The function checks and executes pending commands from the debugger.
272	*
273	* @returns VINF_SUCCESS normally.
274	* @returns VERR_DBGF_RAISE_FATAL_ERROR to pretend a fatal error happend.
275	* @param pVM VM Handle.
276	*/
277	DBGFR3DECL(int) DBGFR3VMMForcedAction(PVM pVM)
278	{
279	/*
280	* Clear the FF DBGF request flag.
281	*/
282	Assert(pVM->fForcedActions & VM_FF_DBGF);
283	VM_FF_CLEAR(pVM, VM_FF_DBGF);
284
285	/*
286	* Commands?
287	*/
288	int rc = VINF_SUCCESS;
289	if (pVM->dbgf.s.enmVMMCmd != DBGFCMD_NO_COMMAND)
290	{
291	/** @todo stupid GDT/LDT sync hack. go away! */
292	SELMR3UpdateFromCPUM(pVM);
293
294	/*
295	* Process the command.
296	*/
297	bool fResumeExecution;
298	DBGFCMDDATA CmdData = pVM->dbgf.s.VMMCmdData;
299	DBGFCMD enmCmd = dbgfr3SetCmd(pVM, DBGFCMD_NO_COMMAND);
300	rc = dbgfr3VMMCmd(pVM, enmCmd, &CmdData, &fResumeExecution);
301	if (!fResumeExecution)
302	rc = dbgfr3VMMWait(pVM);
303	}
304	return rc;
305	}
306
307
308	/**
309	* Flag whether the event implies that we're stopped in the hypervisor code
310	* and have to block certain operations.
311	*
312	* @param pVM The VM handle.
313	* @param enmEvent The event.
314	*/
315	static void dbgfR3EventSetStoppedInHyperFlag(PVM pVM, DBGFEVENTTYPE enmEvent)
316	{
317	switch (enmEvent)
318	{
319	case DBGFEVENT_STEPPED_HYPER:
320	case DBGFEVENT_ASSERTION_HYPER:
321	case DBGFEVENT_BREAKPOINT_HYPER:
322	pVM->dbgf.s.fStoppedInHyper = true;
323	break;
324	default:
325	pVM->dbgf.s.fStoppedInHyper = false;
326	break;
327	}
328	}
329
330
331	/**
332	* Try determin the event context.
333	*
334	* @returns debug event context.
335	* @param pVM The VM handle.
336	*/
337	static DBGFEVENTCTX dbgfR3FigureEventCtx(PVM pVM)
338	{
339	switch (EMGetState(pVM))
340	{
341	case EMSTATE_RAW:
342	case EMSTATE_DEBUG_GUEST_RAW:
343	return DBGFEVENTCTX_RAW;
344
345	case EMSTATE_REM:
346	case EMSTATE_DEBUG_GUEST_REM:
347	return DBGFEVENTCTX_REM;
348
349	case EMSTATE_DEBUG_HYPER:
350	case EMSTATE_GURU_MEDITATION:
351	return DBGFEVENTCTX_HYPER;
352
353	default:
354	return DBGFEVENTCTX_OTHER;
355	}
356	}
357
358	/**
359	* The common event prologue code.
360	* It will set the 'stopped-in-hyper' flag, make sure someone's attach,
361	* and perhaps process any high priority pending actions (none yet).
362	*
363	* @returns VBox status.
364	* @param pVM The VM handle.
365	* @param enmEvent The event to be sent.
366	*/
367	static int dbgfR3EventPrologue(PVM pVM, DBGFEVENTTYPE enmEvent)
368	{
369	/*
370	* Check if a debugger is attached.
371	*/
372	if ( !pVM->dbgf.s.fAttached
373	&& !dbgfR3WaitForAttach(pVM, enmEvent))
374	{
375	Log(("DBGFR3VMMEventSrc: enmEvent=%d - debugger not attached\n", enmEvent));
376	return VERR_DBGF_NOT_ATTACHED;
377	}
378
379	/*
380	* Sync back the state from the REM.
381	*/
382	dbgfR3EventSetStoppedInHyperFlag(pVM, enmEvent);
383	if (!pVM->dbgf.s.fStoppedInHyper)
384	REMR3StateUpdate(pVM);
385
386	/*
387	* Look thru pending commands and finish those which make sense now.
388	*/
389	/** @todo Process/purge pending commands. */
390	//int rc = DBGFR3VMMForcedAction(pVM);
391	return VINF_SUCCESS;
392	}
393
394
395	/**
396	* Sends the event in the event buffer.
397	*
398	* @returns VBox status code.
399	* @param pVM The VM handle.
400	*/
401	static int dbgfR3SendEvent(PVM pVM)
402	{
403	int rc = RTSemPing(&pVM->dbgf.s.PingPong);
404	if (VBOX_SUCCESS(rc))
405	rc = dbgfr3VMMWait(pVM);
406
407	pVM->dbgf.s.fStoppedInHyper = false;
408	/** @todo sync VMM -> REM after exitting the debugger. everything may change while in the debugger! */
409	return rc;
410	}
411
412
413	/**
414	* Send a generic debugger event which takes no data.
415	*
416	* @returns VBox status.
417	* @param pVM The VM handle.
418	* @param enmEvent The event to send.
419	*/
420	DBGFR3DECL(int) DBGFR3Event(PVM pVM, DBGFEVENTTYPE enmEvent)
421	{
422	int rc = dbgfR3EventPrologue(pVM, enmEvent);
423	if (VBOX_FAILURE(rc))
424	return rc;
425
426	/*
427	* Send the event and process the reply communication.
428	*/
429	pVM->dbgf.s.DbgEvent.enmType = enmEvent;
430	pVM->dbgf.s.DbgEvent.enmCtx = dbgfR3FigureEventCtx(pVM);
431	return dbgfR3SendEvent(pVM);
432	}
433
434
435	/**
436	* Send a debugger event which takes the full source file location.
437	*
438	* @returns VBox status.
439	* @param pVM The VM handle.
440	* @param enmEvent The event to send.
441	* @param pszFile Source file.
442	* @param uLine Line number in source file.
443	* @param pszFunction Function name.
444	* @param pszFormat Message which accompanies the event.
445	* @param ... Message arguments.
446	*/
447	DBGFR3DECL(int) DBGFR3EventSrc(PVM pVM, DBGFEVENTTYPE enmEvent, const char pszFile, unsigned uLine, const char pszFunction, const char *pszFormat, ...)
448	{
449	va_list args;
450	va_start(args, pszFormat);
451	int rc = DBGFR3EventSrcV(pVM, enmEvent, pszFile, uLine, pszFunction, pszFormat, args);
452	va_end(args);
453	return rc;
454	}
455
456
457	/**
458	* Send a debugger event which takes the full source file location.
459	*
460	* @returns VBox status.
461	* @param pVM The VM handle.
462	* @param enmEvent The event to send.
463	* @param pszFile Source file.
464	* @param uLine Line number in source file.
465	* @param pszFunction Function name.
466	* @param pszFormat Message which accompanies the event.
467	* @param args Message arguments.
468	*/
469	DBGFR3DECL(int) DBGFR3EventSrcV(PVM pVM, DBGFEVENTTYPE enmEvent, const char pszFile, unsigned uLine, const char pszFunction, const char *pszFormat, va_list args)
470	{
471	int rc = dbgfR3EventPrologue(pVM, enmEvent);
472	if (VBOX_FAILURE(rc))
473	return rc;
474
475	/*
476	* Format the message.
477	*/
478	char *pszMessage = NULL;
479	char szMessage[8192];
480	if (pszFormat && *pszFormat)
481	{
482	pszMessage = &szMessage[0];
483	RTStrPrintfV(szMessage, sizeof(szMessage), pszFormat, args);
484	}
485
486	/*
487	* Send the event and process the reply communication.
488	*/
489	pVM->dbgf.s.DbgEvent.enmType = enmEvent;
490	pVM->dbgf.s.DbgEvent.enmCtx = dbgfR3FigureEventCtx(pVM);
491	pVM->dbgf.s.DbgEvent.u.Src.pszFile = pszFile;
492	pVM->dbgf.s.DbgEvent.u.Src.uLine = uLine;
493	pVM->dbgf.s.DbgEvent.u.Src.pszFunction = pszFunction;
494	pVM->dbgf.s.DbgEvent.u.Src.pszMessage = pszMessage;
495	return dbgfR3SendEvent(pVM);
496	}
497
498
499	/**
500	* Send a debugger event which takes the two assertion messages.
501	*
502	* @returns VBox status.
503	* @param pVM The VM handle.
504	* @param enmEvent The event to send.
505	* @param pszMsg1 First assertion message.
506	* @param pszMsg2 Second assertion message.
507	*/
508	DBGFR3DECL(int) DBGFR3EventAssertion(PVM pVM, DBGFEVENTTYPE enmEvent, const char pszMsg1, const char pszMsg2)
509	{
510	int rc = dbgfR3EventPrologue(pVM, enmEvent);
511	if (VBOX_FAILURE(rc))
512	return rc;
513
514	/*
515	* Send the event and process the reply communication.
516	*/
517	pVM->dbgf.s.DbgEvent.enmType = enmEvent;
518	pVM->dbgf.s.DbgEvent.enmCtx = dbgfR3FigureEventCtx(pVM);
519	pVM->dbgf.s.DbgEvent.u.Assert.pszMsg1 = pszMsg1;
520	pVM->dbgf.s.DbgEvent.u.Assert.pszMsg2 = pszMsg2;
521	return dbgfR3SendEvent(pVM);
522	}
523
524
525	/**
526	* Breakpoint was hit somewhere.
527	* Figure out which breakpoint it is and notify the debugger.
528	*
529	* @returns VBox status.
530	* @param pVM The VM handle.
531	* @param enmEvent DBGFEVENT_BREAKPOINT_HYPER or DBGFEVENT_BREAKPOINT.
532	*/
533	DBGFR3DECL(int) DBGFR3EventBreakpoint(PVM pVM, DBGFEVENTTYPE enmEvent)
534	{
535	int rc = dbgfR3EventPrologue(pVM, enmEvent);
536	if (VBOX_FAILURE(rc))
537	return rc;
538
539	/*
540	* Send the event and process the reply communication.
541	*/
542	pVM->dbgf.s.DbgEvent.enmType = enmEvent;
543	RTUINT iBp = pVM->dbgf.s.DbgEvent.u.Bp.iBp = pVM->dbgf.s.iActiveBp;
544	pVM->dbgf.s.iActiveBp = ~0U;
545	if (iBp != ~0U)
546	pVM->dbgf.s.DbgEvent.enmCtx = DBGFEVENTCTX_RAW;
547	else
548	{
549	/* REM breakpoints has be been searched for. */
550	#if 0 /** @todo get flat PC api! */
551	uint32_t eip = CPUMGetGuestEIP(pVM);
552	#else
553	PCPUMCTX pCtx;
554	CPUMQueryGuestCtxPtr(pVM, &pCtx);
555	uint32_t eip = pCtx->eip + pCtx->csHid.u32Base;
556	#endif
557	for (iBp = 0; iBp < ELEMENTS(pVM->dbgf.s.aBreakpoints); iBp++)
558	if ( pVM->dbgf.s.aBreakpoints[iBp].enmType == DBGFBPTYPE_REM
559	&& pVM->dbgf.s.aBreakpoints[iBp].GCPtr == eip)
560	{
561	pVM->dbgf.s.DbgEvent.u.Bp.iBp = iBp;
562	break;
563	}
564	AssertMsg(pVM->dbgf.s.DbgEvent.u.Bp.iBp != ~0U, ("eip=%08x\n", eip));
565	pVM->dbgf.s.DbgEvent.enmCtx = DBGFEVENTCTX_REM;
566	}
567	return dbgfR3SendEvent(pVM);
568	}
569
570
571	/**
572	* Waits for the debugger to respond.
573	*
574	* @returns VBox status. (clearify)
575	* @param pVM VM handle.
576	*/
577	static int dbgfr3VMMWait(PVM pVM)
578	{
579	LogFlow(("dbgfr3VMMWait:\n"));
580
581	/** @todo stupid GDT/LDT sync hack. go away! */
582	SELMR3UpdateFromCPUM(pVM);
583	int rcRet = VINF_SUCCESS;
584
585	/*
586	* Waits for the debugger to reply (i.e. issue an command).
587	*/
588	for (;;)
589	{
590	/*
591	* Wait.
592	*/
593	for (;;)
594	{
595	int rc = RTSemPingWait(&pVM->dbgf.s.PingPong, 250);
596	if (VBOX_SUCCESS(rc))
597	break;
598	if (rc != VERR_TIMEOUT)
599	{
600	LogFlow(("dbgfr3VMMWait: returns %Vrc\n", rc));
601	return rc;
602	}
603
604	if (VM_FF_ISSET(pVM, VM_FF_REQUEST))
605	{
606	LogFlow(("dbgfr3VMMWait: Processes requests...\n"));
607	rc = VMR3ReqProcess(pVM);
608	LogFlow(("dbgfr3VMMWait: VMR3ReqProcess -> %Vrc rcRet=%Vrc\n", rc, rcRet));
609	if (rc >= VINF_EM_FIRST && rc < VINF_EM_LAST)
610	{
611	switch (rc)
612	{
613	case VINF_EM_DBG_BREAKPOINT:
614	case VINF_EM_DBG_STEPPED:
615	case VINF_EM_DBG_STEP:
616	case VINF_EM_DBG_STOP:
617	AssertMsgFailed(("rc=%Vrc\n", rc));
618	break;
619
620	/* return straight away */
621	case VINF_EM_TERMINATE:
622	case VINF_EM_OFF:
623	LogFlow(("dbgfr3VMMWait: returns %Vrc\n", rc));
624	return rc;
625
626	/* remember return code. */
627	default:
628	AssertReleaseMsgFailed(("rc=%Vrc is not in the switch!\n", rc));
629	case VINF_EM_RESET:
630	case VINF_EM_SUSPEND:
631	case VINF_EM_HALT:
632	case VINF_EM_RESUME:
633	case VINF_EM_RESCHEDULE:
634	case VINF_EM_RESCHEDULE_REM:
635	case VINF_EM_RESCHEDULE_RAW:
636	if (rc < rcRet \|\| rcRet == VINF_SUCCESS)
637	rcRet = rc;
638	break;
639	}
640	}
641	else if (VBOX_FAILURE(rc))
642	{
643	LogFlow(("dbgfr3VMMWait: returns %Vrc\n", rc));
644	return rc;
645	}
646	}
647	}
648
649	/*
650	* Process the command.
651	*/
652	bool fResumeExecution;
653	DBGFCMDDATA CmdData = pVM->dbgf.s.VMMCmdData;
654	DBGFCMD enmCmd = dbgfr3SetCmd(pVM, DBGFCMD_NO_COMMAND);
655	int rc = dbgfr3VMMCmd(pVM, enmCmd, &CmdData, &fResumeExecution);
656	if (fResumeExecution)
657	{
658	if (VBOX_FAILURE(rc))
659	rcRet = rc;
660	else if ( rc >= VINF_EM_FIRST
661	&& rc < VINF_EM_LAST
662	&& (rc < rcRet \|\| rcRet == VINF_SUCCESS))
663	rcRet = rc;
664	LogFlow(("dbgfr3VMMWait: returns %Vrc\n", rcRet));
665	return rcRet;
666	}
667	}
668	}
669
670
671	/**
672	* Executes command from debugger.
673	* The caller is responsible for waiting or resuming execution based on the
674	* value returned in the *pfResumeExecution indicator.
675	*
676	* @returns VBox status. (clearify!)
677	* @param pVM VM Handle.
678	* @param enmCmd The command in question.
679	* @param pCmdData Pointer to the command data.
680	* @param pfResumeExecution Where to store the resume execution / continue waiting indicator.
681	*/
682	static int dbgfr3VMMCmd(PVM pVM, DBGFCMD enmCmd, PDBGFCMDDATA pCmdData, bool *pfResumeExecution)
683	{
684	bool fSendEvent;
685	bool fResume;
686	int rc = VINF_SUCCESS;
687
688	switch (enmCmd)
689	{
690	/*
691	* Halt is answered by an event say that we've halted.
692	*/
693	case DBGFCMD_HALT:
694	{
695	pVM->dbgf.s.DbgEvent.enmType = DBGFEVENT_HALT_DONE;
696	pVM->dbgf.s.DbgEvent.enmCtx = dbgfR3FigureEventCtx(pVM);
697	fSendEvent = true;
698	fResume = false;
699	break;
700	}
701
702
703	/*
704	* Resume is not answered we'll just resume execution.
705	*/
706	case DBGFCMD_GO:
707	{
708	fSendEvent = false;
709	fResume = true;
710	break;
711	}
712
713	/** @todo implement (and define) the rest of the commands. */
714
715	/*
716	* Disable breakpoints and stuff.
717	* Send an everythings cool event to the debugger thread and resume execution.
718	*/
719	case DBGFCMD_DETACH_DEBUGGER:
720	{
721	pVM->dbgf.s.DbgEvent.enmType = DBGFEVENT_DETACH_DONE;
722	pVM->dbgf.s.DbgEvent.enmCtx = DBGFEVENTCTX_OTHER;
723	VM_FF_CLEAR(pVM, VM_FF_DBGF);
724	pVM->dbgf.s.fAttached = false;
725	fSendEvent = true;
726	fResume = true;
727	break;
728	}
729
730	/*
731	* Single step, with trace into.
732	*/
733	case DBGFCMD_SINGLE_STEP:
734	{
735	Log2(("Single step\n"));
736	rc = VINF_EM_DBG_STEP;
737	pVM->dbgf.s.fSingleSteppingRaw = true;
738	fSendEvent = false;
739	fResume = true;
740	break;
741	}
742
743	/*
744	* Default is to send an invalid command event.
745	*/
746	default:
747	{
748	pVM->dbgf.s.DbgEvent.enmType = DBGFEVENT_INVALID_COMMAND;
749	pVM->dbgf.s.DbgEvent.enmCtx = dbgfR3FigureEventCtx(pVM);
750	fSendEvent = true;
751	fResume = false;
752	break;
753	}
754	}
755
756	/*
757	* Send pending event.
758	*/
759	if (fSendEvent)
760	{
761	Log2(("DBGF: Emulation thread: sending event %d\n", pVM->dbgf.s.DbgEvent.enmType));
762	int rc2 = RTSemPing(&pVM->dbgf.s.PingPong);
763	if (VBOX_FAILURE(rc2))
764	{
765	AssertRC(rc2);
766	*pfResumeExecution = true;
767	return rc2;
768	}
769	}
770
771	/*
772	* Return.
773	*/
774	*pfResumeExecution = fResume;
775	return rc;
776	}
777
778
779
780
781	/**
782	* Attaches a debugger to the specified VM.
783	*
784	* Only one debugger at a time.
785	*
786	* @returns VBox status code.
787	* @param pVM VM Handle.
788	*/
789	DBGFR3DECL(int) DBGFR3Attach(PVM pVM)
790	{
791	/*
792	* Check if already attached.
793	*/
794	if (pVM->dbgf.s.fAttached)
795	{
796	AssertMsgFailed(("Already attached\n"));
797	return VERR_DBGF_ALREADY_ATTACHED;
798	}
799
800	/*
801	* Create the Ping-Pong structure.
802	*/
803	int rc = RTSemPingPongInit(&pVM->dbgf.s.PingPong);
804	if (rc)
805	return rc;
806
807	/*
808	* Set the attached flag.
809	*/
810	pVM->dbgf.s.fAttached = true;
811	return VINF_SUCCESS;
812	}
813
814
815	/**
816	* Detaches a debugger from the specified VM.
817	*
818	* Caller must be attached to the VM.
819	*
820	* @returns VBox status code.
821	* @param pVM VM Handle.
822	*/
823	DBGFR3DECL(int) DBGFR3Detach(PVM pVM)
824	{
825	/*
826	* Check if attached.
827	*/
828	if (!pVM->dbgf.s.fAttached)
829	{
830	AssertMsgFailed(("Not attached to VM!\n"));
831	return VERR_DBGF_NOT_ATTACHED;
832	}
833
834	/*
835	* Send detach command.
836	*/
837	if (pVM->dbgf.s.PingPong.enmSpeaker == RTPINGPONGSPEAKER_PONG)
838	{
839	dbgfr3SetCmd(pVM, DBGFCMD_DETACH_DEBUGGER);
840	int rc = RTSemPong(&pVM->dbgf.s.PingPong);
841	if (VBOX_FAILURE(rc))
842	{
843	AssertMsgFailed(("Failed to signal emulation thread. rc=%d\n", rc));
844	return rc;
845	}
846	}
847	else
848	dbgfr3SetCmd(pVM, DBGFCMD_DETACH_DEBUGGER);
849
850	/*
851	* Wait for the ok event.
852	*/
853	PCDBGFEVENT pEvent;
854	int rc = DBGFR3EventWait(pVM, RT_INDEFINITE_WAIT, &pEvent);
855	if (VBOX_FAILURE(rc))
856	{
857	AssertMsgFailed(("Wait on detach command failed, rc=%d\n", rc));
858	return rc;
859	}
860
861	/*
862	* Destroy the ping-pong construct and return.
863	*/
864	pVM->dbgf.s.fAttached = false;
865	RTThreadSleep(10);
866	rc = RTSemPingPongDestroy(&pVM->dbgf.s.PingPong);
867	AssertRC(rc);
868
869	return VINF_SUCCESS;
870	}
871
872
873
874	/**
875	* Wait for a debug event.
876	*
877	* @returns VBox status. Will not return VBOX_INTERRUPTED.
878	* @param pVM VM handle.
879	* @param cMillies Number of millies to wait.
880	* @param ppEvent Where to store the event pointer.
881	*/
882	DBGFR3DECL(int) DBGFR3EventWait(PVM pVM, unsigned cMillies, PCDBGFEVENT *ppEvent)
883	{
884	/*
885	* Check state.
886	*/
887	if (!pVM->dbgf.s.fAttached)
888	{
889	AssertMsgFailed(("Not attached to VM!\n"));
890	return VERR_DBGF_NOT_ATTACHED;
891	}
892	*ppEvent = NULL;
893
894	/*
895	* Wait.
896	*/
897	int rc = RTSemPongWait(&pVM->dbgf.s.PingPong, cMillies);
898	if (VBOX_SUCCESS(rc))
899	{
900	*ppEvent = &pVM->dbgf.s.DbgEvent;
901	Log2(("DBGF: Debugger thread: receiving event %d\n", (*ppEvent)->enmType));
902	return VINF_SUCCESS;
903	}
904
905	return rc;
906	}
907
908
909	/**
910	* Halts VM execution.
911	*
912	* After calling this the VM isn't actually halted till an DBGFEVENT_HALT_DONE
913	* arrives. Until that time it's not possible to issue any new commands.
914	*
915	* @returns VBox status.
916	* @param pVM VM handle.
917	*/
918	DBGFR3DECL(int) DBGFR3Halt(PVM pVM)
919	{
920	/*
921	* Check state.
922	*/
923	if (!pVM->dbgf.s.fAttached)
924	{
925	AssertMsgFailed(("Not attached to VM!\n"));
926	return VERR_DBGF_NOT_ATTACHED;
927	}
928	if ( pVM->dbgf.s.PingPong.enmSpeaker == RTPINGPONGSPEAKER_PONG
929	\|\| pVM->dbgf.s.PingPong.enmSpeaker == RTPINGPONGSPEAKER_PONG_SIGNALED)
930	return VWRN_DBGF_ALREADY_HALTED;
931
932	/*
933	* Send command.
934	*/
935	dbgfr3SetCmd(pVM, DBGFCMD_HALT);
936
937	return VINF_SUCCESS;
938	}
939
940
941	/**
942	* Checks if the VM is halted by the debugger.
943	*
944	* @returns True if halted.
945	* @returns False if not halted.
946	* @param pVM VM handle.
947	*/
948	DBGFR3DECL(bool) DBGFR3IsHalted(PVM pVM)
949	{
950	AssertMsg(pVM->dbgf.s.fAttached, ("Not attached to VM!\n"));
951
952	RTPINGPONGSPEAKER enmSpeaker = pVM->dbgf.s.PingPong.enmSpeaker;
953	return pVM->dbgf.s.fAttached
954	&& ( enmSpeaker == RTPINGPONGSPEAKER_PONG_SIGNALED
955	\|\| enmSpeaker == RTPINGPONGSPEAKER_PONG);
956	}
957
958
959	/**
960	* Checks if the the debugger can wait for events or not.
961	*
962	* This function is only used by lazy, multiplexing debuggers. :-)
963	*
964	* @returns True if waitable.
965	* @returns False if not waitable.
966	* @param pVM VM handle.
967	*/
968	DBGFR3DECL(bool) DBGFR3CanWait(PVM pVM)
969	{
970	AssertMsg(pVM->dbgf.s.fAttached, ("Not attached to VM!\n"));
971
972	RTPINGPONGSPEAKER enmSpeaker = pVM->dbgf.s.PingPong.enmSpeaker;
973	return pVM->dbgf.s.fAttached
974	&& ( enmSpeaker == RTPINGPONGSPEAKER_PING
975	\|\| enmSpeaker == RTPINGPONGSPEAKER_PING_SIGNALED
976	\|\| enmSpeaker == RTPINGPONGSPEAKER_PONG_SIGNALED);
977	}
978
979
980	/**
981	* Resumes VM execution.
982	*
983	* There is no receipt event on this command.
984	*
985	* @returns VBox status.
986	* @param pVM VM handle.
987	*/
988	DBGFR3DECL(int) DBGFR3Resume(PVM pVM)
989	{
990	/*
991	* Check state.
992	*/
993	if (!pVM->dbgf.s.fAttached)
994	{
995	AssertMsgFailed(("Not attached to VM!\n"));
996	return VERR_DBGF_NOT_ATTACHED;
997	}
998	if (pVM->dbgf.s.PingPong.enmSpeaker != RTPINGPONGSPEAKER_PONG)
999	{
1000	AssertMsgFailed(("Speaking out of turn!\n"));
1001	return VERR_SEM_OUT_OF_TURN;
1002	}
1003
1004	/*
1005	* Send the ping back to the emulation thread telling it to run.
1006	*/
1007	dbgfr3SetCmd(pVM, DBGFCMD_GO);
1008	int rc = RTSemPong(&pVM->dbgf.s.PingPong);
1009	AssertRC(rc);
1010
1011	return rc;
1012	}
1013
1014
1015	/**
1016	* Step Into.
1017	*
1018	* A single step event is generated from this command.
1019	* The current implementation is not reliable, so don't rely on the event comming.
1020	*
1021	* @returns VBox status.
1022	* @param pVM VM handle.
1023	*/
1024	DBGFR3DECL(int) DBGFR3Step(PVM pVM)
1025	{
1026	/*
1027	* Check state.
1028	*/
1029	if (!pVM->dbgf.s.fAttached)
1030	{
1031	AssertMsgFailed(("Not attached to VM!\n"));
1032	return VERR_DBGF_NOT_ATTACHED;
1033	}
1034	if (pVM->dbgf.s.PingPong.enmSpeaker != RTPINGPONGSPEAKER_PONG)
1035	{
1036	AssertMsgFailed(("Speaking out of turn!\n"));
1037	return VERR_SEM_OUT_OF_TURN;
1038	}
1039
1040	/*
1041	* Send the ping back to the emulation thread telling it to run.
1042	*/
1043	dbgfr3SetCmd(pVM, DBGFCMD_SINGLE_STEP);
1044	int rc = RTSemPong(&pVM->dbgf.s.PingPong);
1045	AssertRC(rc);
1046	return rc;
1047	}
1048
1049
1050	/**
1051	* Call this to single step rawmode or recompiled mode.
1052	*
1053	* You must pass down the return code to the EM loop! That's
1054	* where the actual single stepping take place (at least in the
1055	* current implementation).
1056	*
1057	* @returns VINF_EM_DBG_STEP
1058	* @thread EMT
1059	*/
1060	DBGFR3DECL(int) DBGFR3PrgStep(PVM pVM)
1061	{
1062	VM_ASSERT_EMT(pVM);
1063
1064	pVM->dbgf.s.fSingleSteppingRaw = true;
1065	return VINF_EM_DBG_STEP;
1066	}
1067

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source: vbox/trunk/src/VBox/VMM/DBGF.cpp@ 2229

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