DBGF.cpp@ 15605

Last change on this file since 15605 was 14660, checked in by vboxsync, 16 years ago
DBGF: don't bother waiting for attach assertions and errors when in HWACCM mode.
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1	/* $Id: DBGF.cpp 14660 2008-11-26 18:20:22Z vboxsync $ */
2	/** @file
3	* DBGF - Debugger Facility.
4	*/
5
6	/*
7	* Copyright (C) 2006-2007 Sun Microsystems, Inc.
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 (GPL) as published by the Free Software
13	* Foundation, in version 2 as it comes in the "COPYING" file of the
14	* VirtualBox OSE distribution. VirtualBox OSE is distributed in the
15	* hope that it will be useful, but WITHOUT ANY WARRANTY of any kind.
16	*
17	* Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa
18	* Clara, CA 95054 USA or visit http://www.sun.com if you need
19	* additional information or have any questions.
20	*/
21
22
23	/** @page pg_dbgf DBGF - The Debugger Facility
24	*
25	* The purpose of the DBGF is to provide an interface for debuggers to
26	* manipulate the VMM without having to mess up the source code for each of
27	* them. The DBGF is always built in and will always work when a debugger
28	* attaches to the VM. The DBGF provides the basic debugger features, such as
29	* halting execution, handling breakpoints, single step execution, instruction
30	* disassembly, info querying, OS specific diggers, symbol and module
31	* management.
32	*
33	* The interface is working in a manner similar to the win32, linux and os2
34	* debugger interfaces. It interface has an asynchronous nature. This comes from
35	* the fact that the VMM and the Debugger are running in different threads. They
36	* are refered to as the "emulation thread" and the "debugger thread", or as the
37	* "ping thread" and the "pong thread, respectivly. (The last set of names comes
38	* from the use of the Ping-Pong synchronization construct from the RTSem API.)
39	*
40	* @see grp_dbgf
41	*
42	*
43	* @section sec_dbgf_scenario Usage Scenario
44	*
45	* The debugger starts by attaching to the VM. For pratical reasons we limit the
46	* number of concurrently attached debuggers to 1 per VM. The action of
47	* attaching to the VM causes the VM to check and generate debug events.
48	*
49	* The debugger then will wait/poll for debug events and issue commands.
50	*
51	* The waiting and polling is done by the DBGFEventWait() function. It will wait
52	* for the emulation thread to send a ping, thus indicating that there is an
53	* event waiting to be processed.
54	*
55	* An event can be a respons to an command issued previously, the hitting of a
56	* breakpoint, or running into a bad/fatal VMM condition. The debugger now have
57	* the ping and must respond to the event at hand - the VMM is waiting. This
58	* usually means that the user of the debugger must do something, but it doesn't
59	* have to. The debugger is free to call any DBGF function (nearly at least)
60	* while processing the event.
61	*
62	* Typically the user will issue a request for the execution to be resumed, so
63	* the debugger calls DBGFResume() and goes back to waiting/polling for events.
64	*
65	* When the user eventually terminates the debugging session or selects another
66	* VM, the debugger detaches from the VM. This means that breakpoints are
67	* disabled and that the emulation thread no longer polls for debugger commands.
68	*
69	*/
70
71
72	/*******************************************************************************
73	* Header Files *
74	*******************************************************************************/
75	#define LOG_GROUP LOG_GROUP_DBGF
76	#include <VBox/dbgf.h>
77	#include <VBox/selm.h>
78	#include <VBox/rem.h>
79	#include <VBox/em.h>
80	#include <VBox/hwaccm.h>
81	#include "DBGFInternal.h"
82	#include <VBox/vm.h>
83	#include <VBox/err.h>
84
85	#include <VBox/log.h>
86	#include <iprt/semaphore.h>
87	#include <iprt/thread.h>
88	#include <iprt/asm.h>
89	#include <iprt/time.h>
90	#include <iprt/assert.h>
91	#include <iprt/stream.h>
92	#include <iprt/env.h>
93
94
95	/*******************************************************************************
96	* Internal Functions *
97	*******************************************************************************/
98	static int dbgfR3VMMWait(PVM pVM);
99	static int dbgfR3VMMCmd(PVM pVM, DBGFCMD enmCmd, PDBGFCMDDATA pCmdData, bool *pfResumeExecution);
100	static DECLCALLBACK(int) dbgfR3Attach(PVM pVM);
101
102
103	/**
104	* Sets the VMM Debug Command variable.
105	*
106	* @returns Previous command.
107	* @param pVM VM Handle.
108	* @param enmCmd The command.
109	*/
110	DECLINLINE(DBGFCMD) dbgfR3SetCmd(PVM pVM, DBGFCMD enmCmd)
111	{
112	DBGFCMD rc;
113	if (enmCmd == DBGFCMD_NO_COMMAND)
114	{
115	Log2(("DBGF: Setting command to %d (DBGFCMD_NO_COMMAND)\n", enmCmd));
116	rc = (DBGFCMD)ASMAtomicXchgU32((uint32_t volatile )(void )&pVM->dbgf.s.enmVMMCmd, enmCmd);
117	VM_FF_CLEAR(pVM, VM_FF_DBGF);
118	}
119	else
120	{
121	Log2(("DBGF: Setting command to %d\n", enmCmd));
122	AssertMsg(pVM->dbgf.s.enmVMMCmd == DBGFCMD_NO_COMMAND, ("enmCmd=%d enmVMMCmd=%d\n", enmCmd, pVM->dbgf.s.enmVMMCmd));
123	rc = (DBGFCMD)ASMAtomicXchgU32((uint32_t volatile )(void )&pVM->dbgf.s.enmVMMCmd, enmCmd);
124	VM_FF_SET(pVM, VM_FF_DBGF);
125	VMR3NotifyFF(pVM, false /* didn't notify REM */);
126	}
127	return rc;
128	}
129
130
131	/**
132	* Initializes the DBGF.
133	*
134	* @returns VBox status code.
135	* @param pVM VM handle.
136	*/
137	VMMR3DECL(int) DBGFR3Init(PVM pVM)
138	{
139	int rc = dbgfR3InfoInit(pVM);
140	if (RT_SUCCESS(rc))
141	rc = dbgfR3SymInit(pVM);
142	if (RT_SUCCESS(rc))
143	rc = dbgfR3BpInit(pVM);
144	return rc;
145	}
146
147
148	/**
149	* Termiantes and cleans up resources allocated by the DBGF.
150	*
151	* @returns VBox status code.
152	* @param pVM VM Handle.
153	*/
154	VMMR3DECL(int) DBGFR3Term(PVM pVM)
155	{
156	int rc;
157
158	/*
159	* Send a termination event to any attached debugger.
160	*/
161	/* wait to become the speaker (we should already be that). */
162	if ( pVM->dbgf.s.fAttached
163	&& RTSemPingShouldWait(&pVM->dbgf.s.PingPong))
164	RTSemPingWait(&pVM->dbgf.s.PingPong, 5000);
165
166	/* now, send the event if we're the speaker. */
167	if ( pVM->dbgf.s.fAttached
168	&& RTSemPingIsSpeaker(&pVM->dbgf.s.PingPong))
169	{
170	DBGFCMD enmCmd = dbgfR3SetCmd(pVM, DBGFCMD_NO_COMMAND);
171	if (enmCmd == DBGFCMD_DETACH_DEBUGGER)
172	/* the debugger beat us to initiating the detaching. */
173	rc = VINF_SUCCESS;
174	else
175	{
176	/* ignore the command (if any). */
177	enmCmd = DBGFCMD_NO_COMMAND;
178	pVM->dbgf.s.DbgEvent.enmType = DBGFEVENT_TERMINATING;
179	pVM->dbgf.s.DbgEvent.enmCtx = DBGFEVENTCTX_OTHER;
180	rc = RTSemPing(&pVM->dbgf.s.PingPong);
181	}
182
183	/*
184	* Process commands until we get a detached command.
185	*/
186	while (RT_SUCCESS(rc) && enmCmd != DBGFCMD_DETACHED_DEBUGGER)
187	{
188	if (enmCmd != DBGFCMD_NO_COMMAND)
189	{
190	/* process command */
191	bool fResumeExecution;
192	DBGFCMDDATA CmdData = pVM->dbgf.s.VMMCmdData;
193	rc = dbgfR3VMMCmd(pVM, enmCmd, &CmdData, &fResumeExecution);
194	enmCmd = DBGFCMD_NO_COMMAND;
195	}
196	else
197	{
198	/* wait for new command. */
199	rc = RTSemPingWait(&pVM->dbgf.s.PingPong, RT_INDEFINITE_WAIT);
200	if (RT_SUCCESS(rc))
201	enmCmd = dbgfR3SetCmd(pVM, DBGFCMD_NO_COMMAND);
202	}
203	}
204	}
205
206	/*
207	* Terminate the other bits.
208	*/
209	dbgfR3OSTerm(pVM);
210	dbgfR3InfoTerm(pVM);
211	return VINF_SUCCESS;
212	}
213
214
215	/**
216	* Applies relocations to data and code managed by this
217	* component. This function will be called at init and
218	* whenever the VMM need to relocate it self inside the GC.
219	*
220	* @param pVM VM handle.
221	* @param offDelta Relocation delta relative to old location.
222	*/
223	VMMR3DECL(void) DBGFR3Relocate(PVM pVM, RTGCINTPTR offDelta)
224	{
225	}
226
227
228	/**
229	* Waits a little while for a debuggger to attach.
230	*
231	* @returns True is a debugger have attached.
232	* @param pVM VM handle.
233	* @param enmEvent Event.
234	*/
235	bool dbgfR3WaitForAttach(PVM pVM, DBGFEVENTTYPE enmEvent)
236	{
237	/*
238	* First a message.
239	*/
240	#ifndef RT_OS_L4
241
242	# if !defined(DEBUG) \|\| defined(DEBUG_sandervl) \|\| defined(DEBUG_frank)
243	int cWait = 10;
244	# else
245	int cWait = HWACCMIsEnabled(pVM)
246	&& ( enmEvent == DBGFEVENT_ASSERTION_HYPER
247	\|\| enmEvent == DBGFEVENT_FATAL_ERROR)
248	&& !RTEnvExist("VBOX_DBGF_WAIT_FOR_ATTACH")
249	? 10
250	: 150;
251	# endif
252	RTStrmPrintf(g_pStdErr, "DBGF: No debugger attached, waiting %d second%s for one to attach (event=%d)\n",
253	cWait / 10, cWait != 10 ? "s" : "", enmEvent);
254	RTStrmFlush(g_pStdErr);
255	while (cWait > 0)
256	{
257	RTThreadSleep(100);
258	if (pVM->dbgf.s.fAttached)
259	{
260	RTStrmPrintf(g_pStdErr, "Attached!\n");
261	RTStrmFlush(g_pStdErr);
262	return true;
263	}
264
265	/* next */
266	if (!(cWait % 10))
267	{
268	RTStrmPrintf(g_pStdErr, "%d.", cWait / 10);
269	RTStrmFlush(g_pStdErr);
270	}
271	cWait--;
272	}
273	#endif
274
275	RTStrmPrintf(g_pStdErr, "Stopping the VM!\n");
276	RTStrmFlush(g_pStdErr);
277	return false;
278	}
279
280
281	/**
282	* Forced action callback.
283	* The VMM will call this from it's main loop when VM_FF_DBGF is set.
284	*
285	* The function checks and executes pending commands from the debugger.
286	*
287	* @returns VINF_SUCCESS normally.
288	* @returns VERR_DBGF_RAISE_FATAL_ERROR to pretend a fatal error happend.
289	* @param pVM VM Handle.
290	*/
291	VMMR3DECL(int) DBGFR3VMMForcedAction(PVM pVM)
292	{
293	/*
294	* Clear the FF DBGF request flag.
295	*/
296	Assert(pVM->fForcedActions & VM_FF_DBGF);
297	VM_FF_CLEAR(pVM, VM_FF_DBGF);
298
299	/*
300	* Commands?
301	*/
302	int rc = VINF_SUCCESS;
303	if (pVM->dbgf.s.enmVMMCmd != DBGFCMD_NO_COMMAND)
304	{
305	/** @todo stupid GDT/LDT sync hack. go away! */
306	SELMR3UpdateFromCPUM(pVM);
307
308	/*
309	* Process the command.
310	*/
311	bool fResumeExecution;
312	DBGFCMDDATA CmdData = pVM->dbgf.s.VMMCmdData;
313	DBGFCMD enmCmd = dbgfR3SetCmd(pVM, DBGFCMD_NO_COMMAND);
314	rc = dbgfR3VMMCmd(pVM, enmCmd, &CmdData, &fResumeExecution);
315	if (!fResumeExecution)
316	rc = dbgfR3VMMWait(pVM);
317	}
318	return rc;
319	}
320
321
322	/**
323	* Flag whether the event implies that we're stopped in the hypervisor code
324	* and have to block certain operations.
325	*
326	* @param pVM The VM handle.
327	* @param enmEvent The event.
328	*/
329	static void dbgfR3EventSetStoppedInHyperFlag(PVM pVM, DBGFEVENTTYPE enmEvent)
330	{
331	switch (enmEvent)
332	{
333	case DBGFEVENT_STEPPED_HYPER:
334	case DBGFEVENT_ASSERTION_HYPER:
335	case DBGFEVENT_BREAKPOINT_HYPER:
336	pVM->dbgf.s.fStoppedInHyper = true;
337	break;
338	default:
339	pVM->dbgf.s.fStoppedInHyper = false;
340	break;
341	}
342	}
343
344
345	/**
346	* Try determin the event context.
347	*
348	* @returns debug event context.
349	* @param pVM The VM handle.
350	*/
351	static DBGFEVENTCTX dbgfR3FigureEventCtx(PVM pVM)
352	{
353	switch (EMGetState(pVM))
354	{
355	case EMSTATE_RAW:
356	case EMSTATE_DEBUG_GUEST_RAW:
357	return DBGFEVENTCTX_RAW;
358
359	case EMSTATE_REM:
360	case EMSTATE_DEBUG_GUEST_REM:
361	return DBGFEVENTCTX_REM;
362
363	case EMSTATE_DEBUG_HYPER:
364	case EMSTATE_GURU_MEDITATION:
365	return DBGFEVENTCTX_HYPER;
366
367	default:
368	return DBGFEVENTCTX_OTHER;
369	}
370	}
371
372	/**
373	* The common event prologue code.
374	* It will set the 'stopped-in-hyper' flag, make sure someone's attach,
375	* and perhaps process any high priority pending actions (none yet).
376	*
377	* @returns VBox status.
378	* @param pVM The VM handle.
379	* @param enmEvent The event to be sent.
380	*/
381	static int dbgfR3EventPrologue(PVM pVM, DBGFEVENTTYPE enmEvent)
382	{
383	/*
384	* Check if a debugger is attached.
385	*/
386	if ( !pVM->dbgf.s.fAttached
387	&& !dbgfR3WaitForAttach(pVM, enmEvent))
388	{
389	Log(("DBGFR3VMMEventSrc: enmEvent=%d - debugger not attached\n", enmEvent));
390	return VERR_DBGF_NOT_ATTACHED;
391	}
392
393	/*
394	* Sync back the state from the REM.
395	*/
396	dbgfR3EventSetStoppedInHyperFlag(pVM, enmEvent);
397	if (!pVM->dbgf.s.fStoppedInHyper)
398	REMR3StateUpdate(pVM);
399
400	/*
401	* Look thru pending commands and finish those which make sense now.
402	*/
403	/** @todo Process/purge pending commands. */
404	//int rc = DBGFR3VMMForcedAction(pVM);
405	return VINF_SUCCESS;
406	}
407
408
409	/**
410	* Sends the event in the event buffer.
411	*
412	* @returns VBox status code.
413	* @param pVM The VM handle.
414	*/
415	static int dbgfR3SendEvent(PVM pVM)
416	{
417	int rc = RTSemPing(&pVM->dbgf.s.PingPong);
418	if (RT_SUCCESS(rc))
419	rc = dbgfR3VMMWait(pVM);
420
421	pVM->dbgf.s.fStoppedInHyper = false;
422	/** @todo sync VMM -> REM after exitting the debugger. everything may change while in the debugger! */
423	return rc;
424	}
425
426
427	/**
428	* Send a generic debugger event which takes no data.
429	*
430	* @returns VBox status.
431	* @param pVM The VM handle.
432	* @param enmEvent The event to send.
433	*/
434	VMMR3DECL(int) DBGFR3Event(PVM pVM, DBGFEVENTTYPE enmEvent)
435	{
436	int rc = dbgfR3EventPrologue(pVM, enmEvent);
437	if (RT_FAILURE(rc))
438	return rc;
439
440	/*
441	* Send the event and process the reply communication.
442	*/
443	pVM->dbgf.s.DbgEvent.enmType = enmEvent;
444	pVM->dbgf.s.DbgEvent.enmCtx = dbgfR3FigureEventCtx(pVM);
445	return dbgfR3SendEvent(pVM);
446	}
447
448
449	/**
450	* Send a debugger event which takes the full source file location.
451	*
452	* @returns VBox status.
453	* @param pVM The VM handle.
454	* @param enmEvent The event to send.
455	* @param pszFile Source file.
456	* @param uLine Line number in source file.
457	* @param pszFunction Function name.
458	* @param pszFormat Message which accompanies the event.
459	* @param ... Message arguments.
460	*/
461	VMMR3DECL(int) DBGFR3EventSrc(PVM pVM, DBGFEVENTTYPE enmEvent, const char pszFile, unsigned uLine, const char pszFunction, const char *pszFormat, ...)
462	{
463	va_list args;
464	va_start(args, pszFormat);
465	int rc = DBGFR3EventSrcV(pVM, enmEvent, pszFile, uLine, pszFunction, pszFormat, args);
466	va_end(args);
467	return rc;
468	}
469
470
471	/**
472	* Send a debugger event which takes the full source file location.
473	*
474	* @returns VBox status.
475	* @param pVM The VM handle.
476	* @param enmEvent The event to send.
477	* @param pszFile Source file.
478	* @param uLine Line number in source file.
479	* @param pszFunction Function name.
480	* @param pszFormat Message which accompanies the event.
481	* @param args Message arguments.
482	*/
483	VMMR3DECL(int) DBGFR3EventSrcV(PVM pVM, DBGFEVENTTYPE enmEvent, const char pszFile, unsigned uLine, const char pszFunction, const char *pszFormat, va_list args)
484	{
485	int rc = dbgfR3EventPrologue(pVM, enmEvent);
486	if (RT_FAILURE(rc))
487	return rc;
488
489	/*
490	* Format the message.
491	*/
492	char *pszMessage = NULL;
493	char szMessage[8192];
494	if (pszFormat && *pszFormat)
495	{
496	pszMessage = &szMessage[0];
497	RTStrPrintfV(szMessage, sizeof(szMessage), pszFormat, args);
498	}
499
500	/*
501	* Send the event and process the reply communication.
502	*/
503	pVM->dbgf.s.DbgEvent.enmType = enmEvent;
504	pVM->dbgf.s.DbgEvent.enmCtx = dbgfR3FigureEventCtx(pVM);
505	pVM->dbgf.s.DbgEvent.u.Src.pszFile = pszFile;
506	pVM->dbgf.s.DbgEvent.u.Src.uLine = uLine;
507	pVM->dbgf.s.DbgEvent.u.Src.pszFunction = pszFunction;
508	pVM->dbgf.s.DbgEvent.u.Src.pszMessage = pszMessage;
509	return dbgfR3SendEvent(pVM);
510	}
511
512
513	/**
514	* Send a debugger event which takes the two assertion messages.
515	*
516	* @returns VBox status.
517	* @param pVM The VM handle.
518	* @param enmEvent The event to send.
519	* @param pszMsg1 First assertion message.
520	* @param pszMsg2 Second assertion message.
521	*/
522	VMMR3DECL(int) DBGFR3EventAssertion(PVM pVM, DBGFEVENTTYPE enmEvent, const char pszMsg1, const char pszMsg2)
523	{
524	int rc = dbgfR3EventPrologue(pVM, enmEvent);
525	if (RT_FAILURE(rc))
526	return rc;
527
528	/*
529	* Send the event and process the reply communication.
530	*/
531	pVM->dbgf.s.DbgEvent.enmType = enmEvent;
532	pVM->dbgf.s.DbgEvent.enmCtx = dbgfR3FigureEventCtx(pVM);
533	pVM->dbgf.s.DbgEvent.u.Assert.pszMsg1 = pszMsg1;
534	pVM->dbgf.s.DbgEvent.u.Assert.pszMsg2 = pszMsg2;
535	return dbgfR3SendEvent(pVM);
536	}
537
538
539	/**
540	* Breakpoint was hit somewhere.
541	* Figure out which breakpoint it is and notify the debugger.
542	*
543	* @returns VBox status.
544	* @param pVM The VM handle.
545	* @param enmEvent DBGFEVENT_BREAKPOINT_HYPER or DBGFEVENT_BREAKPOINT.
546	*/
547	VMMR3DECL(int) DBGFR3EventBreakpoint(PVM pVM, DBGFEVENTTYPE enmEvent)
548	{
549	int rc = dbgfR3EventPrologue(pVM, enmEvent);
550	if (RT_FAILURE(rc))
551	return rc;
552
553	/*
554	* Send the event and process the reply communication.
555	*/
556	pVM->dbgf.s.DbgEvent.enmType = enmEvent;
557	RTUINT iBp = pVM->dbgf.s.DbgEvent.u.Bp.iBp = pVM->dbgf.s.iActiveBp;
558	pVM->dbgf.s.iActiveBp = ~0U;
559	if (iBp != ~0U)
560	pVM->dbgf.s.DbgEvent.enmCtx = DBGFEVENTCTX_RAW;
561	else
562	{
563	/* REM breakpoints has be been searched for. */
564	#if 0 /** @todo get flat PC api! */
565	uint32_t eip = CPUMGetGuestEIP(pVM);
566	#else
567	/* @todo SMP */
568	PCPUMCTX pCtx = CPUMQueryGuestCtxPtrEx(pVM, VMMGetCpuEx(pVM, 0));
569	RTGCPTR eip = pCtx->rip + pCtx->csHid.u64Base;
570	#endif
571	for (iBp = 0; iBp < RT_ELEMENTS(pVM->dbgf.s.aBreakpoints); iBp++)
572	if ( pVM->dbgf.s.aBreakpoints[iBp].enmType == DBGFBPTYPE_REM
573	&& pVM->dbgf.s.aBreakpoints[iBp].GCPtr == eip)
574	{
575	pVM->dbgf.s.DbgEvent.u.Bp.iBp = iBp;
576	break;
577	}
578	AssertMsg(pVM->dbgf.s.DbgEvent.u.Bp.iBp != ~0U, ("eip=%08x\n", eip));
579	pVM->dbgf.s.DbgEvent.enmCtx = DBGFEVENTCTX_REM;
580	}
581	return dbgfR3SendEvent(pVM);
582	}
583
584
585	/**
586	* Waits for the debugger to respond.
587	*
588	* @returns VBox status. (clearify)
589	* @param pVM VM handle.
590	*/
591	static int dbgfR3VMMWait(PVM pVM)
592	{
593	LogFlow(("dbgfR3VMMWait:\n"));
594
595	/** @todo stupid GDT/LDT sync hack. go away! */
596	SELMR3UpdateFromCPUM(pVM);
597	int rcRet = VINF_SUCCESS;
598
599	/*
600	* Waits for the debugger to reply (i.e. issue an command).
601	*/
602	for (;;)
603	{
604	/*
605	* Wait.
606	*/
607	for (;;)
608	{
609	int rc = RTSemPingWait(&pVM->dbgf.s.PingPong, 250);
610	if (RT_SUCCESS(rc))
611	break;
612	if (rc != VERR_TIMEOUT)
613	{
614	LogFlow(("dbgfR3VMMWait: returns %Rrc\n", rc));
615	return rc;
616	}
617
618	if (VM_FF_ISSET(pVM, VM_FF_REQUEST))
619	{
620	LogFlow(("dbgfR3VMMWait: Processes requests...\n"));
621	rc = VMR3ReqProcessU(pVM->pUVM, VMREQDEST_ANY);
622	LogFlow(("dbgfR3VMMWait: VMR3ReqProcess -> %Rrc rcRet=%Rrc\n", rc, rcRet));
623	if (rc >= VINF_EM_FIRST && rc <= VINF_EM_LAST)
624	{
625	switch (rc)
626	{
627	case VINF_EM_DBG_BREAKPOINT:
628	case VINF_EM_DBG_STEPPED:
629	case VINF_EM_DBG_STEP:
630	case VINF_EM_DBG_STOP:
631	AssertMsgFailed(("rc=%Rrc\n", rc));
632	break;
633
634	/* return straight away */
635	case VINF_EM_TERMINATE:
636	case VINF_EM_OFF:
637	LogFlow(("dbgfR3VMMWait: returns %Rrc\n", rc));
638	return rc;
639
640	/* remember return code. */
641	default:
642	AssertReleaseMsgFailed(("rc=%Rrc is not in the switch!\n", rc));
643	case VINF_EM_RESET:
644	case VINF_EM_SUSPEND:
645	case VINF_EM_HALT:
646	case VINF_EM_RESUME:
647	case VINF_EM_RESCHEDULE:
648	case VINF_EM_RESCHEDULE_REM:
649	case VINF_EM_RESCHEDULE_RAW:
650	if (rc < rcRet \|\| rcRet == VINF_SUCCESS)
651	rcRet = rc;
652	break;
653	}
654	}
655	else if (RT_FAILURE(rc))
656	{
657	LogFlow(("dbgfR3VMMWait: returns %Rrc\n", rc));
658	return rc;
659	}
660	}
661	}
662
663	/*
664	* Process the command.
665	*/
666	bool fResumeExecution;
667	DBGFCMDDATA CmdData = pVM->dbgf.s.VMMCmdData;
668	DBGFCMD enmCmd = dbgfR3SetCmd(pVM, DBGFCMD_NO_COMMAND);
669	int rc = dbgfR3VMMCmd(pVM, enmCmd, &CmdData, &fResumeExecution);
670	if (fResumeExecution)
671	{
672	if (RT_FAILURE(rc))
673	rcRet = rc;
674	else if ( rc >= VINF_EM_FIRST
675	&& rc <= VINF_EM_LAST
676	&& (rc < rcRet \|\| rcRet == VINF_SUCCESS))
677	rcRet = rc;
678	LogFlow(("dbgfR3VMMWait: returns %Rrc\n", rcRet));
679	return rcRet;
680	}
681	}
682	}
683
684
685	/**
686	* Executes command from debugger.
687	* The caller is responsible for waiting or resuming execution based on the
688	* value returned in the *pfResumeExecution indicator.
689	*
690	* @returns VBox status. (clearify!)
691	* @param pVM VM Handle.
692	* @param enmCmd The command in question.
693	* @param pCmdData Pointer to the command data.
694	* @param pfResumeExecution Where to store the resume execution / continue waiting indicator.
695	*/
696	static int dbgfR3VMMCmd(PVM pVM, DBGFCMD enmCmd, PDBGFCMDDATA pCmdData, bool *pfResumeExecution)
697	{
698	bool fSendEvent;
699	bool fResume;
700	int rc = VINF_SUCCESS;
701
702	switch (enmCmd)
703	{
704	/*
705	* Halt is answered by an event say that we've halted.
706	*/
707	case DBGFCMD_HALT:
708	{
709	pVM->dbgf.s.DbgEvent.enmType = DBGFEVENT_HALT_DONE;
710	pVM->dbgf.s.DbgEvent.enmCtx = dbgfR3FigureEventCtx(pVM);
711	fSendEvent = true;
712	fResume = false;
713	break;
714	}
715
716
717	/*
718	* Resume is not answered we'll just resume execution.
719	*/
720	case DBGFCMD_GO:
721	{
722	fSendEvent = false;
723	fResume = true;
724	break;
725	}
726
727	/** @todo implement (and define) the rest of the commands. */
728
729	/*
730	* Disable breakpoints and stuff.
731	* Send an everythings cool event to the debugger thread and resume execution.
732	*/
733	case DBGFCMD_DETACH_DEBUGGER:
734	{
735	ASMAtomicWriteBool(&pVM->dbgf.s.fAttached, false);
736	pVM->dbgf.s.DbgEvent.enmType = DBGFEVENT_DETACH_DONE;
737	pVM->dbgf.s.DbgEvent.enmCtx = DBGFEVENTCTX_OTHER;
738	fSendEvent = true;
739	fResume = true;
740	break;
741	}
742
743	/*
744	* The debugger has detached successfully.
745	* There is no reply to this event.
746	*/
747	case DBGFCMD_DETACHED_DEBUGGER:
748	{
749	fSendEvent = false;
750	fResume = true;
751	break;
752	}
753
754	/*
755	* Single step, with trace into.
756	*/
757	case DBGFCMD_SINGLE_STEP:
758	{
759	Log2(("Single step\n"));
760	rc = VINF_EM_DBG_STEP;
761	pVM->dbgf.s.fSingleSteppingRaw = true;
762	fSendEvent = false;
763	fResume = true;
764	break;
765	}
766
767	/*
768	* Default is to send an invalid command event.
769	*/
770	default:
771	{
772	pVM->dbgf.s.DbgEvent.enmType = DBGFEVENT_INVALID_COMMAND;
773	pVM->dbgf.s.DbgEvent.enmCtx = dbgfR3FigureEventCtx(pVM);
774	fSendEvent = true;
775	fResume = false;
776	break;
777	}
778	}
779
780	/*
781	* Send pending event.
782	*/
783	if (fSendEvent)
784	{
785	Log2(("DBGF: Emulation thread: sending event %d\n", pVM->dbgf.s.DbgEvent.enmType));
786	int rc2 = RTSemPing(&pVM->dbgf.s.PingPong);
787	if (RT_FAILURE(rc2))
788	{
789	AssertRC(rc2);
790	*pfResumeExecution = true;
791	return rc2;
792	}
793	}
794
795	/*
796	* Return.
797	*/
798	*pfResumeExecution = fResume;
799	return rc;
800	}
801
802
803	/**
804	* Attaches a debugger to the specified VM.
805	*
806	* Only one debugger at a time.
807	*
808	* @returns VBox status code.
809	* @param pVM VM Handle.
810	*/
811	VMMR3DECL(int) DBGFR3Attach(PVM pVM)
812	{
813	/*
814	* Some validations first.
815	*/
816	if (!VALID_PTR(pVM))
817	{
818	Log(("DBGFR3Attach: bad VM handle: %p\n", pVM));
819	return VERR_INVALID_HANDLE;
820	}
821	VMSTATE enmVMState = pVM->enmVMState;
822	if ( enmVMState >= VMSTATE_DESTROYING
823	\|\| enmVMState < VMSTATE_CREATING)
824	{
825	Log(("DBGFR3Attach: Invalid VM state: %s\n", VMGetStateName(enmVMState)));
826	return VERR_INVALID_HANDLE;
827	}
828
829	/*
830	* Call the VM, use EMT for serialization.
831	*/
832	PVMREQ pReq;
833	int rc = VMR3ReqCall(pVM, VMREQDEST_ANY, &pReq, RT_INDEFINITE_WAIT, (PFNRT)dbgfR3Attach, 1, pVM);
834	if (RT_SUCCESS(rc))
835	rc = pReq->iStatus;
836	VMR3ReqFree(pReq);
837
838	return rc;
839	}
840
841
842	/**
843	* EMT worker for DBGFR3Attach.
844	*
845	* @returns VBox status code.
846	* @param pVM Pointer to the shared VM structure.
847	*/
848	static DECLCALLBACK(int) dbgfR3Attach(PVM pVM)
849	{
850	if (pVM->dbgf.s.fAttached)
851	{
852	Log(("dbgR3Attach: Debugger already attached\n"));
853	return VERR_DBGF_ALREADY_ATTACHED;
854	}
855
856	/*
857	* Create the Ping-Pong structure.
858	*/
859	int rc = RTSemPingPongInit(&pVM->dbgf.s.PingPong);
860	AssertRCReturn(rc, rc);
861
862	/*
863	* Set the attached flag.
864	*/
865	ASMAtomicWriteBool(&pVM->dbgf.s.fAttached, true);
866	return VINF_SUCCESS;
867	}
868
869
870	/**
871	* Detaches a debugger from the specified VM.
872	*
873	* Caller must be attached to the VM.
874	*
875	* @returns VBox status code.
876	* @param pVM VM Handle.
877	*/
878	VMMR3DECL(int) DBGFR3Detach(PVM pVM)
879	{
880	LogFlow(("DBGFR3Detach:\n"));
881	int rc;
882
883	/*
884	* Check if attached.
885	*/
886	AssertReturn(pVM->dbgf.s.fAttached, VERR_DBGF_NOT_ATTACHED);
887
888	/*
889	* Try send the detach command.
890	* Keep in mind that we might be racing EMT, so, be extra careful.
891	*/
892	DBGFCMD enmCmd = dbgfR3SetCmd(pVM, DBGFCMD_DETACH_DEBUGGER);
893	if (RTSemPongIsSpeaker(&pVM->dbgf.s.PingPong))
894	{
895	rc = RTSemPong(&pVM->dbgf.s.PingPong);
896	AssertMsgRCReturn(rc, ("Failed to signal emulation thread. rc=%Rrc\n", rc), rc);
897	LogRel(("DBGFR3Detach: enmCmd=%d (pong -> ping)\n", enmCmd));
898	}
899
900	/*
901	* Wait for the OK event.
902	*/
903	rc = RTSemPongWait(&pVM->dbgf.s.PingPong, RT_INDEFINITE_WAIT);
904	AssertLogRelMsgRCReturn(rc, ("Wait on detach command failed, rc=%Rrc\n", rc), rc);
905
906	/*
907	* Send the notification command indicating that we're really done.
908	*/
909	enmCmd = dbgfR3SetCmd(pVM, DBGFCMD_DETACHED_DEBUGGER);
910	rc = RTSemPong(&pVM->dbgf.s.PingPong);
911	AssertMsgRCReturn(rc, ("Failed to signal emulation thread. rc=%Rrc\n", rc), rc);
912
913	LogFlowFunc(("returns VINF_SUCCESS\n"));
914	return VINF_SUCCESS;
915	}
916
917
918	/**
919	* Wait for a debug event.
920	*
921	* @returns VBox status. Will not return VBOX_INTERRUPTED.
922	* @param pVM VM handle.
923	* @param cMillies Number of millies to wait.
924	* @param ppEvent Where to store the event pointer.
925	*/
926	VMMR3DECL(int) DBGFR3EventWait(PVM pVM, unsigned cMillies, PCDBGFEVENT *ppEvent)
927	{
928	/*
929	* Check state.
930	*/
931	AssertReturn(pVM->dbgf.s.fAttached, VERR_DBGF_NOT_ATTACHED);
932	*ppEvent = NULL;
933
934	/*
935	* Wait.
936	*/
937	int rc = RTSemPongWait(&pVM->dbgf.s.PingPong, cMillies);
938	if (RT_SUCCESS(rc))
939	{
940	*ppEvent = &pVM->dbgf.s.DbgEvent;
941	Log2(("DBGF: Debugger thread: receiving event %d\n", (*ppEvent)->enmType));
942	return VINF_SUCCESS;
943	}
944
945	return rc;
946	}
947
948
949	/**
950	* Halts VM execution.
951	*
952	* After calling this the VM isn't actually halted till an DBGFEVENT_HALT_DONE
953	* arrives. Until that time it's not possible to issue any new commands.
954	*
955	* @returns VBox status.
956	* @param pVM VM handle.
957	*/
958	VMMR3DECL(int) DBGFR3Halt(PVM pVM)
959	{
960	/*
961	* Check state.
962	*/
963	AssertReturn(pVM->dbgf.s.fAttached, VERR_DBGF_NOT_ATTACHED);
964	RTPINGPONGSPEAKER enmSpeaker = pVM->dbgf.s.PingPong.enmSpeaker;
965	if ( enmSpeaker == RTPINGPONGSPEAKER_PONG
966	\|\| enmSpeaker == RTPINGPONGSPEAKER_PONG_SIGNALED)
967	return VWRN_DBGF_ALREADY_HALTED;
968
969	/*
970	* Send command.
971	*/
972	dbgfR3SetCmd(pVM, DBGFCMD_HALT);
973
974	return VINF_SUCCESS;
975	}
976
977
978	/**
979	* Checks if the VM is halted by the debugger.
980	*
981	* @returns True if halted.
982	* @returns False if not halted.
983	* @param pVM VM handle.
984	*/
985	VMMR3DECL(bool) DBGFR3IsHalted(PVM pVM)
986	{
987	AssertReturn(pVM->dbgf.s.fAttached, false);
988	RTPINGPONGSPEAKER enmSpeaker = pVM->dbgf.s.PingPong.enmSpeaker;
989	return enmSpeaker == RTPINGPONGSPEAKER_PONG_SIGNALED
990	\|\| enmSpeaker == RTPINGPONGSPEAKER_PONG;
991	}
992
993
994	/**
995	* Checks if the debugger can wait for events or not.
996	*
997	* This function is only used by lazy, multiplexing debuggers. :-)
998	*
999	* @returns True if waitable.
1000	* @returns False if not waitable.
1001	* @param pVM VM handle.
1002	*/
1003	VMMR3DECL(bool) DBGFR3CanWait(PVM pVM)
1004	{
1005	AssertReturn(pVM->dbgf.s.fAttached, false);
1006	return RTSemPongShouldWait(&pVM->dbgf.s.PingPong);
1007	}
1008
1009
1010	/**
1011	* Resumes VM execution.
1012	*
1013	* There is no receipt event on this command.
1014	*
1015	* @returns VBox status.
1016	* @param pVM VM handle.
1017	*/
1018	VMMR3DECL(int) DBGFR3Resume(PVM pVM)
1019	{
1020	/*
1021	* Check state.
1022	*/
1023	AssertReturn(pVM->dbgf.s.fAttached, VERR_DBGF_NOT_ATTACHED);
1024	AssertReturn(RTSemPongIsSpeaker(&pVM->dbgf.s.PingPong), VERR_SEM_OUT_OF_TURN);
1025
1026	/*
1027	* Send the ping back to the emulation thread telling it to run.
1028	*/
1029	dbgfR3SetCmd(pVM, DBGFCMD_GO);
1030	int rc = RTSemPong(&pVM->dbgf.s.PingPong);
1031	AssertRC(rc);
1032
1033	return rc;
1034	}
1035
1036
1037	/**
1038	* Step Into.
1039	*
1040	* A single step event is generated from this command.
1041	* The current implementation is not reliable, so don't rely on the event comming.
1042	*
1043	* @returns VBox status.
1044	* @param pVM VM handle.
1045	*/
1046	VMMR3DECL(int) DBGFR3Step(PVM pVM)
1047	{
1048	/*
1049	* Check state.
1050	*/
1051	AssertReturn(pVM->dbgf.s.fAttached, VERR_DBGF_NOT_ATTACHED);
1052	AssertReturn(RTSemPongIsSpeaker(&pVM->dbgf.s.PingPong), VERR_SEM_OUT_OF_TURN);
1053
1054	/*
1055	* Send the ping back to the emulation thread telling it to run.
1056	*/
1057	dbgfR3SetCmd(pVM, DBGFCMD_SINGLE_STEP);
1058	int rc = RTSemPong(&pVM->dbgf.s.PingPong);
1059	AssertRC(rc);
1060	return rc;
1061	}
1062
1063
1064	/**
1065	* Call this to single step rawmode or recompiled mode.
1066	*
1067	* You must pass down the return code to the EM loop! That's
1068	* where the actual single stepping take place (at least in the
1069	* current implementation).
1070	*
1071	* @returns VINF_EM_DBG_STEP
1072	* @thread EMT
1073	*/
1074	VMMR3DECL(int) DBGFR3PrgStep(PVM pVM)
1075	{
1076	VM_ASSERT_EMT(pVM);
1077
1078	pVM->dbgf.s.fSingleSteppingRaw = true;
1079	return VINF_EM_DBG_STEP;
1080	}
1081

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source: vbox/trunk/src/VBox/VMM/DBGF.cpp@ 15605

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