DBGF.cpp@ 19297

Last change on this file since 19297 was 19286, checked in by vboxsync, 16 years ago
VMM,VBoxDbg: SMP refactoring, part 1.
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1	/* $Id: DBGF.cpp 19286 2009-05-01 12:41:07Z 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	VMR3NotifyGlobalFF(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	PVMCPU pVCpu = VMMGetCpu(pVM);
294
295	/*
296	* Clear the FF DBGF request flag.
297	*/
298	Assert(pVM->fGlobalForcedActions & VM_FF_DBGF);
299	VM_FF_CLEAR(pVM, VM_FF_DBGF);
300
301	/*
302	* Commands?
303	*/
304	int rc = VINF_SUCCESS;
305	if (pVM->dbgf.s.enmVMMCmd != DBGFCMD_NO_COMMAND)
306	{
307	/** @todo stupid GDT/LDT sync hack. go away! */
308	SELMR3UpdateFromCPUM(pVM, pVCpu);
309
310	/*
311	* Process the command.
312	*/
313	bool fResumeExecution;
314	DBGFCMDDATA CmdData = pVM->dbgf.s.VMMCmdData;
315	DBGFCMD enmCmd = dbgfR3SetCmd(pVM, DBGFCMD_NO_COMMAND);
316	rc = dbgfR3VMMCmd(pVM, enmCmd, &CmdData, &fResumeExecution);
317	if (!fResumeExecution)
318	rc = dbgfR3VMMWait(pVM);
319	}
320	return rc;
321	}
322
323
324	/**
325	* Flag whether the event implies that we're stopped in the hypervisor code
326	* and have to block certain operations.
327	*
328	* @param pVM The VM handle.
329	* @param enmEvent The event.
330	*/
331	static void dbgfR3EventSetStoppedInHyperFlag(PVM pVM, DBGFEVENTTYPE enmEvent)
332	{
333	switch (enmEvent)
334	{
335	case DBGFEVENT_STEPPED_HYPER:
336	case DBGFEVENT_ASSERTION_HYPER:
337	case DBGFEVENT_BREAKPOINT_HYPER:
338	pVM->dbgf.s.fStoppedInHyper = true;
339	break;
340	default:
341	pVM->dbgf.s.fStoppedInHyper = false;
342	break;
343	}
344	}
345
346
347	/**
348	* Try to determine the event context.
349	*
350	* @returns debug event context.
351	* @param pVM The VM handle.
352	*/
353	static DBGFEVENTCTX dbgfR3FigureEventCtx(PVM pVM)
354	{
355	/** @todo SMP support! */
356	PVMCPU pVCpu = &pVM->aCpus[0];
357
358	switch (EMGetState(pVCpu))
359	{
360	case EMSTATE_RAW:
361	case EMSTATE_DEBUG_GUEST_RAW:
362	return DBGFEVENTCTX_RAW;
363
364	case EMSTATE_REM:
365	case EMSTATE_DEBUG_GUEST_REM:
366	return DBGFEVENTCTX_REM;
367
368	case EMSTATE_DEBUG_HYPER:
369	case EMSTATE_GURU_MEDITATION:
370	return DBGFEVENTCTX_HYPER;
371
372	default:
373	return DBGFEVENTCTX_OTHER;
374	}
375	}
376
377	/**
378	* The common event prologue code.
379	* It will set the 'stopped-in-hyper' flag, make sure someone's attach,
380	* and perhaps process any high priority pending actions (none yet).
381	*
382	* @returns VBox status.
383	* @param pVM The VM handle.
384	* @param enmEvent The event to be sent.
385	*/
386	static int dbgfR3EventPrologue(PVM pVM, DBGFEVENTTYPE enmEvent)
387	{
388	/** @todo SMP */
389	PVMCPU pVCpu = VMMGetCpu(pVM);
390
391	/*
392	* Check if a debugger is attached.
393	*/
394	if ( !pVM->dbgf.s.fAttached
395	&& !dbgfR3WaitForAttach(pVM, enmEvent))
396	{
397	Log(("DBGFR3VMMEventSrc: enmEvent=%d - debugger not attached\n", enmEvent));
398	return VERR_DBGF_NOT_ATTACHED;
399	}
400
401	/*
402	* Sync back the state from the REM.
403	*/
404	dbgfR3EventSetStoppedInHyperFlag(pVM, enmEvent);
405	if (!pVM->dbgf.s.fStoppedInHyper)
406	REMR3StateUpdate(pVM, pVCpu);
407
408	/*
409	* Look thru pending commands and finish those which make sense now.
410	*/
411	/** @todo Process/purge pending commands. */
412	//int rc = DBGFR3VMMForcedAction(pVM);
413	return VINF_SUCCESS;
414	}
415
416
417	/**
418	* Sends the event in the event buffer.
419	*
420	* @returns VBox status code.
421	* @param pVM The VM handle.
422	*/
423	static int dbgfR3SendEvent(PVM pVM)
424	{
425	int rc = RTSemPing(&pVM->dbgf.s.PingPong);
426	if (RT_SUCCESS(rc))
427	rc = dbgfR3VMMWait(pVM);
428
429	pVM->dbgf.s.fStoppedInHyper = false;
430	/** @todo sync VMM -> REM after exitting the debugger. everything may change while in the debugger! */
431	return rc;
432	}
433
434
435	/**
436	* Send a generic debugger event which takes no data.
437	*
438	* @returns VBox status.
439	* @param pVM The VM handle.
440	* @param enmEvent The event to send.
441	*/
442	VMMR3DECL(int) DBGFR3Event(PVM pVM, DBGFEVENTTYPE enmEvent)
443	{
444	int rc = dbgfR3EventPrologue(pVM, enmEvent);
445	if (RT_FAILURE(rc))
446	return rc;
447
448	/*
449	* Send the event and process the reply communication.
450	*/
451	pVM->dbgf.s.DbgEvent.enmType = enmEvent;
452	pVM->dbgf.s.DbgEvent.enmCtx = dbgfR3FigureEventCtx(pVM);
453	return dbgfR3SendEvent(pVM);
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 ... Message arguments.
468	*/
469	VMMR3DECL(int) DBGFR3EventSrc(PVM pVM, DBGFEVENTTYPE enmEvent, const char pszFile, unsigned uLine, const char pszFunction, const char *pszFormat, ...)
470	{
471	va_list args;
472	va_start(args, pszFormat);
473	int rc = DBGFR3EventSrcV(pVM, enmEvent, pszFile, uLine, pszFunction, pszFormat, args);
474	va_end(args);
475	return rc;
476	}
477
478
479	/**
480	* Send a debugger event which takes the full source file location.
481	*
482	* @returns VBox status.
483	* @param pVM The VM handle.
484	* @param enmEvent The event to send.
485	* @param pszFile Source file.
486	* @param uLine Line number in source file.
487	* @param pszFunction Function name.
488	* @param pszFormat Message which accompanies the event.
489	* @param args Message arguments.
490	*/
491	VMMR3DECL(int) DBGFR3EventSrcV(PVM pVM, DBGFEVENTTYPE enmEvent, const char pszFile, unsigned uLine, const char pszFunction, const char *pszFormat, va_list args)
492	{
493	int rc = dbgfR3EventPrologue(pVM, enmEvent);
494	if (RT_FAILURE(rc))
495	return rc;
496
497	/*
498	* Format the message.
499	*/
500	char *pszMessage = NULL;
501	char szMessage[8192];
502	if (pszFormat && *pszFormat)
503	{
504	pszMessage = &szMessage[0];
505	RTStrPrintfV(szMessage, sizeof(szMessage), pszFormat, args);
506	}
507
508	/*
509	* Send the event and process the reply communication.
510	*/
511	pVM->dbgf.s.DbgEvent.enmType = enmEvent;
512	pVM->dbgf.s.DbgEvent.enmCtx = dbgfR3FigureEventCtx(pVM);
513	pVM->dbgf.s.DbgEvent.u.Src.pszFile = pszFile;
514	pVM->dbgf.s.DbgEvent.u.Src.uLine = uLine;
515	pVM->dbgf.s.DbgEvent.u.Src.pszFunction = pszFunction;
516	pVM->dbgf.s.DbgEvent.u.Src.pszMessage = pszMessage;
517	return dbgfR3SendEvent(pVM);
518	}
519
520
521	/**
522	* Send a debugger event which takes the two assertion messages.
523	*
524	* @returns VBox status.
525	* @param pVM The VM handle.
526	* @param enmEvent The event to send.
527	* @param pszMsg1 First assertion message.
528	* @param pszMsg2 Second assertion message.
529	*/
530	VMMR3DECL(int) DBGFR3EventAssertion(PVM pVM, DBGFEVENTTYPE enmEvent, const char pszMsg1, const char pszMsg2)
531	{
532	int rc = dbgfR3EventPrologue(pVM, enmEvent);
533	if (RT_FAILURE(rc))
534	return rc;
535
536	/*
537	* Send the event and process the reply communication.
538	*/
539	pVM->dbgf.s.DbgEvent.enmType = enmEvent;
540	pVM->dbgf.s.DbgEvent.enmCtx = dbgfR3FigureEventCtx(pVM);
541	pVM->dbgf.s.DbgEvent.u.Assert.pszMsg1 = pszMsg1;
542	pVM->dbgf.s.DbgEvent.u.Assert.pszMsg2 = pszMsg2;
543	return dbgfR3SendEvent(pVM);
544	}
545
546
547	/**
548	* Breakpoint was hit somewhere.
549	* Figure out which breakpoint it is and notify the debugger.
550	*
551	* @returns VBox status.
552	* @param pVM The VM handle.
553	* @param enmEvent DBGFEVENT_BREAKPOINT_HYPER or DBGFEVENT_BREAKPOINT.
554	*/
555	VMMR3DECL(int) DBGFR3EventBreakpoint(PVM pVM, DBGFEVENTTYPE enmEvent)
556	{
557	int rc = dbgfR3EventPrologue(pVM, enmEvent);
558	if (RT_FAILURE(rc))
559	return rc;
560
561	/*
562	* Send the event and process the reply communication.
563	*/
564	/** @todo SMP */
565	PVMCPU pVCpu = VMMGetCpu0(pVM);
566
567	pVM->dbgf.s.DbgEvent.enmType = enmEvent;
568	RTUINT iBp = pVM->dbgf.s.DbgEvent.u.Bp.iBp = pVCpu->dbgf.s.iActiveBp;
569	pVCpu->dbgf.s.iActiveBp = ~0U;
570	if (iBp != ~0U)
571	pVM->dbgf.s.DbgEvent.enmCtx = DBGFEVENTCTX_RAW;
572	else
573	{
574	/* REM breakpoints has be been searched for. */
575	#if 0 /** @todo get flat PC api! */
576	uint32_t eip = CPUMGetGuestEIP(pVM);
577	#else
578	/* @todo SMP support!! */
579	PCPUMCTX pCtx = CPUMQueryGuestCtxPtr(VMMGetCpu(pVM));
580	RTGCPTR eip = pCtx->rip + pCtx->csHid.u64Base;
581	#endif
582	for (iBp = 0; iBp < RT_ELEMENTS(pVM->dbgf.s.aBreakpoints); iBp++)
583	if ( pVM->dbgf.s.aBreakpoints[iBp].enmType == DBGFBPTYPE_REM
584	&& pVM->dbgf.s.aBreakpoints[iBp].GCPtr == eip)
585	{
586	pVM->dbgf.s.DbgEvent.u.Bp.iBp = iBp;
587	break;
588	}
589	AssertMsg(pVM->dbgf.s.DbgEvent.u.Bp.iBp != ~0U, ("eip=%08x\n", eip));
590	pVM->dbgf.s.DbgEvent.enmCtx = DBGFEVENTCTX_REM;
591	}
592	return dbgfR3SendEvent(pVM);
593	}
594
595
596	/**
597	* Waits for the debugger to respond.
598	*
599	* @returns VBox status. (clearify)
600	* @param pVM VM handle.
601	*/
602	static int dbgfR3VMMWait(PVM pVM)
603	{
604	PVMCPU pVCpu = VMMGetCpu(pVM);
605
606	LogFlow(("dbgfR3VMMWait:\n"));
607
608	/** @todo stupid GDT/LDT sync hack. go away! */
609	SELMR3UpdateFromCPUM(pVM, pVCpu);
610	int rcRet = VINF_SUCCESS;
611
612	/*
613	* Waits for the debugger to reply (i.e. issue an command).
614	*/
615	for (;;)
616	{
617	/*
618	* Wait.
619	*/
620	for (;;)
621	{
622	int rc = RTSemPingWait(&pVM->dbgf.s.PingPong, 250);
623	if (RT_SUCCESS(rc))
624	break;
625	if (rc != VERR_TIMEOUT)
626	{
627	LogFlow(("dbgfR3VMMWait: returns %Rrc\n", rc));
628	return rc;
629	}
630
631	if (VM_FF_ISSET(pVM, VM_FF_REQUEST))
632	{
633	LogFlow(("dbgfR3VMMWait: Processes requests...\n"));
634	rc = VMR3ReqProcessU(pVM->pUVM, VMREQDEST_ANY);
635	LogFlow(("dbgfR3VMMWait: VMR3ReqProcess -> %Rrc rcRet=%Rrc\n", rc, rcRet));
636	if (rc >= VINF_EM_FIRST && rc <= VINF_EM_LAST)
637	{
638	switch (rc)
639	{
640	case VINF_EM_DBG_BREAKPOINT:
641	case VINF_EM_DBG_STEPPED:
642	case VINF_EM_DBG_STEP:
643	case VINF_EM_DBG_STOP:
644	AssertMsgFailed(("rc=%Rrc\n", rc));
645	break;
646
647	/* return straight away */
648	case VINF_EM_TERMINATE:
649	case VINF_EM_OFF:
650	LogFlow(("dbgfR3VMMWait: returns %Rrc\n", rc));
651	return rc;
652
653	/* remember return code. */
654	default:
655	AssertReleaseMsgFailed(("rc=%Rrc is not in the switch!\n", rc));
656	case VINF_EM_RESET:
657	case VINF_EM_SUSPEND:
658	case VINF_EM_HALT:
659	case VINF_EM_RESUME:
660	case VINF_EM_RESCHEDULE:
661	case VINF_EM_RESCHEDULE_REM:
662	case VINF_EM_RESCHEDULE_RAW:
663	if (rc < rcRet \|\| rcRet == VINF_SUCCESS)
664	rcRet = rc;
665	break;
666	}
667	}
668	else if (RT_FAILURE(rc))
669	{
670	LogFlow(("dbgfR3VMMWait: returns %Rrc\n", rc));
671	return rc;
672	}
673	}
674	}
675
676	/*
677	* Process the command.
678	*/
679	bool fResumeExecution;
680	DBGFCMDDATA CmdData = pVM->dbgf.s.VMMCmdData;
681	DBGFCMD enmCmd = dbgfR3SetCmd(pVM, DBGFCMD_NO_COMMAND);
682	int rc = dbgfR3VMMCmd(pVM, enmCmd, &CmdData, &fResumeExecution);
683	if (fResumeExecution)
684	{
685	if (RT_FAILURE(rc))
686	rcRet = rc;
687	else if ( rc >= VINF_EM_FIRST
688	&& rc <= VINF_EM_LAST
689	&& (rc < rcRet \|\| rcRet == VINF_SUCCESS))
690	rcRet = rc;
691	LogFlow(("dbgfR3VMMWait: returns %Rrc\n", rcRet));
692	return rcRet;
693	}
694	}
695	}
696
697
698	/**
699	* Executes command from debugger.
700	* The caller is responsible for waiting or resuming execution based on the
701	* value returned in the *pfResumeExecution indicator.
702	*
703	* @returns VBox status. (clearify!)
704	* @param pVM VM Handle.
705	* @param enmCmd The command in question.
706	* @param pCmdData Pointer to the command data.
707	* @param pfResumeExecution Where to store the resume execution / continue waiting indicator.
708	*/
709	static int dbgfR3VMMCmd(PVM pVM, DBGFCMD enmCmd, PDBGFCMDDATA pCmdData, bool *pfResumeExecution)
710	{
711	bool fSendEvent;
712	bool fResume;
713	int rc = VINF_SUCCESS;
714
715	switch (enmCmd)
716	{
717	/*
718	* Halt is answered by an event say that we've halted.
719	*/
720	case DBGFCMD_HALT:
721	{
722	pVM->dbgf.s.DbgEvent.enmType = DBGFEVENT_HALT_DONE;
723	pVM->dbgf.s.DbgEvent.enmCtx = dbgfR3FigureEventCtx(pVM);
724	fSendEvent = true;
725	fResume = false;
726	break;
727	}
728
729
730	/*
731	* Resume is not answered we'll just resume execution.
732	*/
733	case DBGFCMD_GO:
734	{
735	fSendEvent = false;
736	fResume = true;
737	break;
738	}
739
740	/** @todo implement (and define) the rest of the commands. */
741
742	/*
743	* Disable breakpoints and stuff.
744	* Send an everythings cool event to the debugger thread and resume execution.
745	*/
746	case DBGFCMD_DETACH_DEBUGGER:
747	{
748	ASMAtomicWriteBool(&pVM->dbgf.s.fAttached, false);
749	pVM->dbgf.s.DbgEvent.enmType = DBGFEVENT_DETACH_DONE;
750	pVM->dbgf.s.DbgEvent.enmCtx = DBGFEVENTCTX_OTHER;
751	fSendEvent = true;
752	fResume = true;
753	break;
754	}
755
756	/*
757	* The debugger has detached successfully.
758	* There is no reply to this event.
759	*/
760	case DBGFCMD_DETACHED_DEBUGGER:
761	{
762	fSendEvent = false;
763	fResume = true;
764	break;
765	}
766
767	/*
768	* Single step, with trace into.
769	*/
770	case DBGFCMD_SINGLE_STEP:
771	{
772	Log2(("Single step\n"));
773	rc = VINF_EM_DBG_STEP;
774	/** @todo SMP */
775	PVMCPU pVCpu = VMMGetCpu0(pVM);
776	pVCpu->dbgf.s.fSingleSteppingRaw = true;
777	fSendEvent = false;
778	fResume = true;
779	break;
780	}
781
782	/*
783	* Default is to send an invalid command event.
784	*/
785	default:
786	{
787	pVM->dbgf.s.DbgEvent.enmType = DBGFEVENT_INVALID_COMMAND;
788	pVM->dbgf.s.DbgEvent.enmCtx = dbgfR3FigureEventCtx(pVM);
789	fSendEvent = true;
790	fResume = false;
791	break;
792	}
793	}
794
795	/*
796	* Send pending event.
797	*/
798	if (fSendEvent)
799	{
800	Log2(("DBGF: Emulation thread: sending event %d\n", pVM->dbgf.s.DbgEvent.enmType));
801	int rc2 = RTSemPing(&pVM->dbgf.s.PingPong);
802	if (RT_FAILURE(rc2))
803	{
804	AssertRC(rc2);
805	*pfResumeExecution = true;
806	return rc2;
807	}
808	}
809
810	/*
811	* Return.
812	*/
813	*pfResumeExecution = fResume;
814	return rc;
815	}
816
817
818	/**
819	* Attaches a debugger to the specified VM.
820	*
821	* Only one debugger at a time.
822	*
823	* @returns VBox status code.
824	* @param pVM VM Handle.
825	*/
826	VMMR3DECL(int) DBGFR3Attach(PVM pVM)
827	{
828	/*
829	* Some validations first.
830	*/
831	if (!VALID_PTR(pVM))
832	{
833	Log(("DBGFR3Attach: bad VM handle: %p\n", pVM));
834	return VERR_INVALID_HANDLE;
835	}
836	VMSTATE enmVMState = pVM->enmVMState;
837	if ( enmVMState >= VMSTATE_DESTROYING
838	\|\| enmVMState < VMSTATE_CREATING)
839	{
840	Log(("DBGFR3Attach: Invalid VM state: %s\n", VMGetStateName(enmVMState)));
841	return VERR_INVALID_HANDLE;
842	}
843
844	/*
845	* Call the VM, use EMT for serialization.
846	*/
847	PVMREQ pReq;
848	int rc = VMR3ReqCall(pVM, VMREQDEST_ANY, &pReq, RT_INDEFINITE_WAIT, (PFNRT)dbgfR3Attach, 1, pVM);
849	if (RT_SUCCESS(rc))
850	rc = pReq->iStatus;
851	VMR3ReqFree(pReq);
852
853	return rc;
854	}
855
856
857	/**
858	* EMT worker for DBGFR3Attach.
859	*
860	* @returns VBox status code.
861	* @param pVM Pointer to the shared VM structure.
862	*/
863	static DECLCALLBACK(int) dbgfR3Attach(PVM pVM)
864	{
865	if (pVM->dbgf.s.fAttached)
866	{
867	Log(("dbgR3Attach: Debugger already attached\n"));
868	return VERR_DBGF_ALREADY_ATTACHED;
869	}
870
871	/*
872	* Create the Ping-Pong structure.
873	*/
874	int rc = RTSemPingPongInit(&pVM->dbgf.s.PingPong);
875	AssertRCReturn(rc, rc);
876
877	/*
878	* Set the attached flag.
879	*/
880	ASMAtomicWriteBool(&pVM->dbgf.s.fAttached, true);
881	return VINF_SUCCESS;
882	}
883
884
885	/**
886	* Detaches a debugger from the specified VM.
887	*
888	* Caller must be attached to the VM.
889	*
890	* @returns VBox status code.
891	* @param pVM VM Handle.
892	*/
893	VMMR3DECL(int) DBGFR3Detach(PVM pVM)
894	{
895	LogFlow(("DBGFR3Detach:\n"));
896	int rc;
897
898	/*
899	* Check if attached.
900	*/
901	AssertReturn(pVM->dbgf.s.fAttached, VERR_DBGF_NOT_ATTACHED);
902
903	/*
904	* Try send the detach command.
905	* Keep in mind that we might be racing EMT, so, be extra careful.
906	*/
907	DBGFCMD enmCmd = dbgfR3SetCmd(pVM, DBGFCMD_DETACH_DEBUGGER);
908	if (RTSemPongIsSpeaker(&pVM->dbgf.s.PingPong))
909	{
910	rc = RTSemPong(&pVM->dbgf.s.PingPong);
911	AssertMsgRCReturn(rc, ("Failed to signal emulation thread. rc=%Rrc\n", rc), rc);
912	LogRel(("DBGFR3Detach: enmCmd=%d (pong -> ping)\n", enmCmd));
913	}
914
915	/*
916	* Wait for the OK event.
917	*/
918	rc = RTSemPongWait(&pVM->dbgf.s.PingPong, RT_INDEFINITE_WAIT);
919	AssertLogRelMsgRCReturn(rc, ("Wait on detach command failed, rc=%Rrc\n", rc), rc);
920
921	/*
922	* Send the notification command indicating that we're really done.
923	*/
924	enmCmd = dbgfR3SetCmd(pVM, DBGFCMD_DETACHED_DEBUGGER);
925	rc = RTSemPong(&pVM->dbgf.s.PingPong);
926	AssertMsgRCReturn(rc, ("Failed to signal emulation thread. rc=%Rrc\n", rc), rc);
927
928	LogFlowFunc(("returns VINF_SUCCESS\n"));
929	return VINF_SUCCESS;
930	}
931
932
933	/**
934	* Wait for a debug event.
935	*
936	* @returns VBox status. Will not return VBOX_INTERRUPTED.
937	* @param pVM VM handle.
938	* @param cMillies Number of millies to wait.
939	* @param ppEvent Where to store the event pointer.
940	*/
941	VMMR3DECL(int) DBGFR3EventWait(PVM pVM, unsigned cMillies, PCDBGFEVENT *ppEvent)
942	{
943	/*
944	* Check state.
945	*/
946	AssertReturn(pVM->dbgf.s.fAttached, VERR_DBGF_NOT_ATTACHED);
947	*ppEvent = NULL;
948
949	/*
950	* Wait.
951	*/
952	int rc = RTSemPongWait(&pVM->dbgf.s.PingPong, cMillies);
953	if (RT_SUCCESS(rc))
954	{
955	*ppEvent = &pVM->dbgf.s.DbgEvent;
956	Log2(("DBGF: Debugger thread: receiving event %d\n", (*ppEvent)->enmType));
957	return VINF_SUCCESS;
958	}
959
960	return rc;
961	}
962
963
964	/**
965	* Halts VM execution.
966	*
967	* After calling this the VM isn't actually halted till an DBGFEVENT_HALT_DONE
968	* arrives. Until that time it's not possible to issue any new commands.
969	*
970	* @returns VBox status.
971	* @param pVM VM handle.
972	*/
973	VMMR3DECL(int) DBGFR3Halt(PVM pVM)
974	{
975	/*
976	* Check state.
977	*/
978	AssertReturn(pVM->dbgf.s.fAttached, VERR_DBGF_NOT_ATTACHED);
979	RTPINGPONGSPEAKER enmSpeaker = pVM->dbgf.s.PingPong.enmSpeaker;
980	if ( enmSpeaker == RTPINGPONGSPEAKER_PONG
981	\|\| enmSpeaker == RTPINGPONGSPEAKER_PONG_SIGNALED)
982	return VWRN_DBGF_ALREADY_HALTED;
983
984	/*
985	* Send command.
986	*/
987	dbgfR3SetCmd(pVM, DBGFCMD_HALT);
988
989	return VINF_SUCCESS;
990	}
991
992
993	/**
994	* Checks if the VM is halted by the debugger.
995	*
996	* @returns True if halted.
997	* @returns False if not halted.
998	* @param pVM VM handle.
999	*/
1000	VMMR3DECL(bool) DBGFR3IsHalted(PVM pVM)
1001	{
1002	AssertReturn(pVM->dbgf.s.fAttached, false);
1003	RTPINGPONGSPEAKER enmSpeaker = pVM->dbgf.s.PingPong.enmSpeaker;
1004	return enmSpeaker == RTPINGPONGSPEAKER_PONG_SIGNALED
1005	\|\| enmSpeaker == RTPINGPONGSPEAKER_PONG;
1006	}
1007
1008
1009	/**
1010	* Checks if the debugger can wait for events or not.
1011	*
1012	* This function is only used by lazy, multiplexing debuggers. :-)
1013	*
1014	* @returns True if waitable.
1015	* @returns False if not waitable.
1016	* @param pVM VM handle.
1017	*/
1018	VMMR3DECL(bool) DBGFR3CanWait(PVM pVM)
1019	{
1020	AssertReturn(pVM->dbgf.s.fAttached, false);
1021	return RTSemPongShouldWait(&pVM->dbgf.s.PingPong);
1022	}
1023
1024
1025	/**
1026	* Resumes VM execution.
1027	*
1028	* There is no receipt event on this command.
1029	*
1030	* @returns VBox status.
1031	* @param pVM VM handle.
1032	*/
1033	VMMR3DECL(int) DBGFR3Resume(PVM pVM)
1034	{
1035	/*
1036	* Check state.
1037	*/
1038	AssertReturn(pVM->dbgf.s.fAttached, VERR_DBGF_NOT_ATTACHED);
1039	AssertReturn(RTSemPongIsSpeaker(&pVM->dbgf.s.PingPong), VERR_SEM_OUT_OF_TURN);
1040
1041	/*
1042	* Send the ping back to the emulation thread telling it to run.
1043	*/
1044	dbgfR3SetCmd(pVM, DBGFCMD_GO);
1045	int rc = RTSemPong(&pVM->dbgf.s.PingPong);
1046	AssertRC(rc);
1047
1048	return rc;
1049	}
1050
1051
1052	/**
1053	* Step Into.
1054	*
1055	* A single step event is generated from this command.
1056	* The current implementation is not reliable, so don't rely on the event comming.
1057	*
1058	* @returns VBox status.
1059	* @param pVM VM handle.
1060	* @param idCpu The ID of the CPU to single step on.
1061	*/
1062	VMMR3DECL(int) DBGFR3Step(PVM pVM, VMCPUID idCpu)
1063	{
1064	/*
1065	* Check state.
1066	*/
1067	AssertReturn(pVM->dbgf.s.fAttached, VERR_DBGF_NOT_ATTACHED);
1068	AssertReturn(RTSemPongIsSpeaker(&pVM->dbgf.s.PingPong), VERR_SEM_OUT_OF_TURN);
1069	AssertReturn(idCpu < pVM->cCPUs, VERR_INVALID_PARAMETER);
1070
1071	/*
1072	* Send the ping back to the emulation thread telling it to run.
1073	*/
1074	/** @todo SMP (idCpu) */
1075	dbgfR3SetCmd(pVM, DBGFCMD_SINGLE_STEP);
1076	int rc = RTSemPong(&pVM->dbgf.s.PingPong);
1077	AssertRC(rc);
1078	return rc;
1079	}
1080
1081
1082	/**
1083	* Call this to single step programatically.
1084	*
1085	* You must pass down the return code to the EM loop! That's
1086	* where the actual single stepping take place (at least in the
1087	* current implementation).
1088	*
1089	* @returns VINF_EM_DBG_STEP
1090	*
1091	* @param pVCpu The virtual CPU handle.
1092	*
1093	* @thread VCpu EMT
1094	*/
1095	VMMR3DECL(int) DBGFR3PrgStep(PVMCPU pVCpu)
1096	{
1097	VMCPU_ASSERT_EMT(pVCpu);
1098
1099	pVCpu->dbgf.s.fSingleSteppingRaw = true;
1100	return VINF_EM_DBG_STEP;
1101	}
1102

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source: vbox/trunk/src/VBox/VMM/DBGF.cpp@ 19297

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