DBGF.cpp@ 42833

Last change on this file since 42833 was 42833, checked in by vboxsync, 12 years ago
DBGFR3EventBreakpoint: get REM breakpoint number from its DBGFBP::iBp. It is set up by dbgfR3BpInit to account for consecutive numbering of breakpoints, so we don't have to be leak those details here.
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1	/* $Id: DBGF.cpp 42833 2012-08-15 23:28:35Z vboxsync $ */
2	/** @file
3	* DBGF - Debugger Facility.
4	*/
5
6	/*
7	* Copyright (C) 2006-2007 Oracle Corporation
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
18
19	/** @page pg_dbgf DBGF - The Debugger Facility
20	*
21	* The purpose of the DBGF is to provide an interface for debuggers to
22	* manipulate the VMM without having to mess up the source code for each of
23	* them. The DBGF is always built in and will always work when a debugger
24	* attaches to the VM. The DBGF provides the basic debugger features, such as
25	* halting execution, handling breakpoints, single step execution, instruction
26	* disassembly, info querying, OS specific diggers, symbol and module
27	* management.
28	*
29	* The interface is working in a manner similar to the win32, linux and os2
30	* debugger interfaces. The interface has an asynchronous nature. This comes
31	* from the fact that the VMM and the Debugger are running in different threads.
32	* They are referred to as the "emulation thread" and the "debugger thread", or
33	* as the "ping thread" and the "pong thread, respectivly. (The last set of
34	* names comes from the use of the Ping-Pong synchronization construct from the
35	* RTSem API.)
36	*
37	* @see grp_dbgf
38	*
39	*
40	* @section sec_dbgf_scenario Usage Scenario
41	*
42	* The debugger starts by attaching to the VM. For practical reasons we limit the
43	* number of concurrently attached debuggers to 1 per VM. The action of
44	* attaching to the VM causes the VM to check and generate debug events.
45	*
46	* The debugger then will wait/poll for debug events and issue commands.
47	*
48	* The waiting and polling is done by the DBGFEventWait() function. It will wait
49	* for the emulation thread to send a ping, thus indicating that there is an
50	* event waiting to be processed.
51	*
52	* An event can be a response to a command issued previously, the hitting of a
53	* breakpoint, or running into a bad/fatal VMM condition. The debugger now has
54	* the ping and must respond to the event at hand - the VMM is waiting. This
55	* usually means that the user of the debugger must do something, but it doesn't
56	* have to. The debugger is free to call any DBGF function (nearly at least)
57	* while processing the event.
58	*
59	* Typically the user will issue a request for the execution to be resumed, so
60	* the debugger calls DBGFResume() and goes back to waiting/polling for events.
61	*
62	* When the user eventually terminates the debugging session or selects another
63	* VM, the debugger detaches from the VM. This means that breakpoints are
64	* disabled and that the emulation thread no longer polls for debugger commands.
65	*
66	*/
67
68
69	/*******************************************************************************
70	* Header Files *
71	*******************************************************************************/
72	#define LOG_GROUP LOG_GROUP_DBGF
73	#include <VBox/vmm/dbgf.h>
74	#include <VBox/vmm/selm.h>
75	#ifdef VBOX_WITH_REM
76	# include <VBox/vmm/rem.h>
77	#endif
78	#include <VBox/vmm/em.h>
79	#include <VBox/vmm/hwaccm.h>
80	#include "DBGFInternal.h"
81	#include <VBox/vmm/vm.h>
82	#include <VBox/err.h>
83
84	#include <VBox/log.h>
85	#include <iprt/semaphore.h>
86	#include <iprt/thread.h>
87	#include <iprt/asm.h>
88	#include <iprt/time.h>
89	#include <iprt/assert.h>
90	#include <iprt/stream.h>
91	#include <iprt/env.h>
92
93
94	/*******************************************************************************
95	* Internal Functions *
96	*******************************************************************************/
97	static int dbgfR3VMMWait(PVM pVM);
98	static int dbgfR3VMMCmd(PVM pVM, DBGFCMD enmCmd, PDBGFCMDDATA pCmdData, bool *pfResumeExecution);
99	static DECLCALLBACK(int) dbgfR3Attach(PVM pVM);
100
101
102	/**
103	* Sets the VMM Debug Command variable.
104	*
105	* @returns Previous command.
106	* @param pVM Pointer to the VM.
107	* @param enmCmd The command.
108	*/
109	DECLINLINE(DBGFCMD) dbgfR3SetCmd(PVM pVM, DBGFCMD enmCmd)
110	{
111	DBGFCMD rc;
112	if (enmCmd == DBGFCMD_NO_COMMAND)
113	{
114	Log2(("DBGF: Setting command to %d (DBGFCMD_NO_COMMAND)\n", enmCmd));
115	rc = (DBGFCMD)ASMAtomicXchgU32((uint32_t volatile )(void )&pVM->dbgf.s.enmVMMCmd, enmCmd);
116	VM_FF_CLEAR(pVM, VM_FF_DBGF);
117	}
118	else
119	{
120	Log2(("DBGF: Setting command to %d\n", enmCmd));
121	AssertMsg(pVM->dbgf.s.enmVMMCmd == DBGFCMD_NO_COMMAND, ("enmCmd=%d enmVMMCmd=%d\n", enmCmd, pVM->dbgf.s.enmVMMCmd));
122	rc = (DBGFCMD)ASMAtomicXchgU32((uint32_t volatile )(void )&pVM->dbgf.s.enmVMMCmd, enmCmd);
123	VM_FF_SET(pVM, VM_FF_DBGF);
124	VMR3NotifyGlobalFFU(pVM->pUVM, 0 /* didn't notify REM */);
125	}
126	return rc;
127	}
128
129
130	/**
131	* Initializes the DBGF.
132	*
133	* @returns VBox status code.
134	* @param pVM Pointer to the VM.
135	*/
136	VMMR3DECL(int) DBGFR3Init(PVM pVM)
137	{
138	int rc = dbgfR3InfoInit(pVM);
139	if (RT_SUCCESS(rc))
140	rc = dbgfR3TraceInit(pVM);
141	if (RT_SUCCESS(rc))
142	rc = dbgfR3RegInit(pVM);
143	if (RT_SUCCESS(rc))
144	rc = dbgfR3AsInit(pVM);
145	if (RT_SUCCESS(rc))
146	rc = dbgfR3SymInit(pVM);
147	if (RT_SUCCESS(rc))
148	rc = dbgfR3BpInit(pVM);
149	return rc;
150	}
151
152
153	/**
154	* Terminates and cleans up resources allocated by the DBGF.
155	*
156	* @returns VBox status code.
157	* @param pVM Pointer to the VM.
158	*/
159	VMMR3DECL(int) DBGFR3Term(PVM pVM)
160	{
161	int rc;
162
163	/*
164	* Send a termination event to any attached debugger.
165	*/
166	/* wait to become the speaker (we should already be that). */
167	if ( pVM->dbgf.s.fAttached
168	&& RTSemPingShouldWait(&pVM->dbgf.s.PingPong))
169	RTSemPingWait(&pVM->dbgf.s.PingPong, 5000);
170
171	/* now, send the event if we're the speaker. */
172	if ( pVM->dbgf.s.fAttached
173	&& RTSemPingIsSpeaker(&pVM->dbgf.s.PingPong))
174	{
175	DBGFCMD enmCmd = dbgfR3SetCmd(pVM, DBGFCMD_NO_COMMAND);
176	if (enmCmd == DBGFCMD_DETACH_DEBUGGER)
177	/* the debugger beat us to initiating the detaching. */
178	rc = VINF_SUCCESS;
179	else
180	{
181	/* ignore the command (if any). */
182	enmCmd = DBGFCMD_NO_COMMAND;
183	pVM->dbgf.s.DbgEvent.enmType = DBGFEVENT_TERMINATING;
184	pVM->dbgf.s.DbgEvent.enmCtx = DBGFEVENTCTX_OTHER;
185	rc = RTSemPing(&pVM->dbgf.s.PingPong);
186	}
187
188	/*
189	* Process commands until we get a detached command.
190	*/
191	while (RT_SUCCESS(rc) && enmCmd != DBGFCMD_DETACHED_DEBUGGER)
192	{
193	if (enmCmd != DBGFCMD_NO_COMMAND)
194	{
195	/* process command */
196	bool fResumeExecution;
197	DBGFCMDDATA CmdData = pVM->dbgf.s.VMMCmdData;
198	rc = dbgfR3VMMCmd(pVM, enmCmd, &CmdData, &fResumeExecution);
199	enmCmd = DBGFCMD_NO_COMMAND;
200	}
201	else
202	{
203	/* wait for new command. */
204	rc = RTSemPingWait(&pVM->dbgf.s.PingPong, RT_INDEFINITE_WAIT);
205	if (RT_SUCCESS(rc))
206	enmCmd = dbgfR3SetCmd(pVM, DBGFCMD_NO_COMMAND);
207	}
208	}
209	}
210
211	/*
212	* Terminate the other bits.
213	*/
214	dbgfR3OSTerm(pVM);
215	dbgfR3AsTerm(pVM);
216	dbgfR3RegTerm(pVM);
217	dbgfR3TraceTerm(pVM);
218	dbgfR3InfoTerm(pVM);
219	return VINF_SUCCESS;
220	}
221
222
223	/**
224	* Applies relocations to data and code managed by this
225	* component. This function will be called at init and
226	* whenever the VMM need to relocate it self inside the GC.
227	*
228	* @param pVM Pointer to the VM.
229	* @param offDelta Relocation delta relative to old location.
230	*/
231	VMMR3DECL(void) DBGFR3Relocate(PVM pVM, RTGCINTPTR offDelta)
232	{
233	dbgfR3TraceRelocate(pVM);
234	dbgfR3AsRelocate(pVM, offDelta);
235	}
236
237
238	/**
239	* Waits a little while for a debuggger to attach.
240	*
241	* @returns True is a debugger have attached.
242	* @param pVM Pointer to the VM.
243	* @param enmEvent Event.
244	*/
245	bool dbgfR3WaitForAttach(PVM pVM, DBGFEVENTTYPE enmEvent)
246	{
247	/*
248	* First a message.
249	*/
250	#ifndef RT_OS_L4
251
252	# if !defined(DEBUG) \|\| defined(DEBUG_sandervl) \|\| defined(DEBUG_frank) \|\| defined(IEM_VERIFICATION_MODE)
253	int cWait = 10;
254	# else
255	int cWait = HWACCMIsEnabled(pVM)
256	&& ( enmEvent == DBGFEVENT_ASSERTION_HYPER
257	\|\| enmEvent == DBGFEVENT_FATAL_ERROR)
258	&& !RTEnvExist("VBOX_DBGF_WAIT_FOR_ATTACH")
259	? 10
260	: 150;
261	# endif
262	RTStrmPrintf(g_pStdErr, "DBGF: No debugger attached, waiting %d second%s for one to attach (event=%d)\n",
263	cWait / 10, cWait != 10 ? "s" : "", enmEvent);
264	RTStrmFlush(g_pStdErr);
265	while (cWait > 0)
266	{
267	RTThreadSleep(100);
268	if (pVM->dbgf.s.fAttached)
269	{
270	RTStrmPrintf(g_pStdErr, "Attached!\n");
271	RTStrmFlush(g_pStdErr);
272	return true;
273	}
274
275	/* next */
276	if (!(cWait % 10))
277	{
278	RTStrmPrintf(g_pStdErr, "%d.", cWait / 10);
279	RTStrmFlush(g_pStdErr);
280	}
281	cWait--;
282	}
283	#endif
284
285	RTStrmPrintf(g_pStdErr, "Stopping the VM!\n");
286	RTStrmFlush(g_pStdErr);
287	return false;
288	}
289
290
291	/**
292	* Forced action callback.
293	* The VMM will call this from it's main loop when VM_FF_DBGF is set.
294	*
295	* The function checks and executes pending commands from the debugger.
296	*
297	* @returns VINF_SUCCESS normally.
298	* @returns VERR_DBGF_RAISE_FATAL_ERROR to pretend a fatal error happened.
299	* @param pVM Pointer to the VM.
300	*/
301	VMMR3DECL(int) DBGFR3VMMForcedAction(PVM pVM)
302	{
303	int rc = VINF_SUCCESS;
304
305	if (VM_FF_TESTANDCLEAR(pVM, VM_FF_DBGF))
306	{
307	PVMCPU pVCpu = VMMGetCpu(pVM);
308
309	/*
310	* Commands?
311	*/
312	if (pVM->dbgf.s.enmVMMCmd != DBGFCMD_NO_COMMAND)
313	{
314	/** @todo stupid GDT/LDT sync hack. go away! */
315	SELMR3UpdateFromCPUM(pVM, pVCpu);
316
317	/*
318	* Process the command.
319	*/
320	bool fResumeExecution;
321	DBGFCMDDATA CmdData = pVM->dbgf.s.VMMCmdData;
322	DBGFCMD enmCmd = dbgfR3SetCmd(pVM, DBGFCMD_NO_COMMAND);
323	rc = dbgfR3VMMCmd(pVM, enmCmd, &CmdData, &fResumeExecution);
324	if (!fResumeExecution)
325	rc = dbgfR3VMMWait(pVM);
326	}
327	}
328	return rc;
329	}
330
331
332	/**
333	* Flag whether the event implies that we're stopped in the hypervisor code
334	* and have to block certain operations.
335	*
336	* @param pVM Pointer to the VM.
337	* @param enmEvent The event.
338	*/
339	static void dbgfR3EventSetStoppedInHyperFlag(PVM pVM, DBGFEVENTTYPE enmEvent)
340	{
341	switch (enmEvent)
342	{
343	case DBGFEVENT_STEPPED_HYPER:
344	case DBGFEVENT_ASSERTION_HYPER:
345	case DBGFEVENT_BREAKPOINT_HYPER:
346	pVM->dbgf.s.fStoppedInHyper = true;
347	break;
348	default:
349	pVM->dbgf.s.fStoppedInHyper = false;
350	break;
351	}
352	}
353
354
355	/**
356	* Try to determine the event context.
357	*
358	* @returns debug event context.
359	* @param pVM Pointer to the VM.
360	*/
361	static DBGFEVENTCTX dbgfR3FigureEventCtx(PVM pVM)
362	{
363	/** @todo SMP support! */
364	PVMCPU pVCpu = &pVM->aCpus[0];
365
366	switch (EMGetState(pVCpu))
367	{
368	case EMSTATE_RAW:
369	case EMSTATE_DEBUG_GUEST_RAW:
370	return DBGFEVENTCTX_RAW;
371
372	case EMSTATE_REM:
373	case EMSTATE_DEBUG_GUEST_REM:
374	return DBGFEVENTCTX_REM;
375
376	case EMSTATE_DEBUG_HYPER:
377	case EMSTATE_GURU_MEDITATION:
378	return DBGFEVENTCTX_HYPER;
379
380	default:
381	return DBGFEVENTCTX_OTHER;
382	}
383	}
384
385	/**
386	* The common event prologue code.
387	* It will set the 'stopped-in-hyper' flag, make sure someone is attached,
388	* and perhaps process any high priority pending actions (none yet).
389	*
390	* @returns VBox status.
391	* @param pVM Pointer to the VM.
392	* @param enmEvent The event to be sent.
393	*/
394	static int dbgfR3EventPrologue(PVM pVM, DBGFEVENTTYPE enmEvent)
395	{
396	/** @todo SMP */
397	PVMCPU pVCpu = VMMGetCpu(pVM);
398
399	/*
400	* Check if a debugger is attached.
401	*/
402	if ( !pVM->dbgf.s.fAttached
403	&& !dbgfR3WaitForAttach(pVM, enmEvent))
404	{
405	Log(("DBGFR3VMMEventSrc: enmEvent=%d - debugger not attached\n", enmEvent));
406	return VERR_DBGF_NOT_ATTACHED;
407	}
408
409	/*
410	* Sync back the state from the REM.
411	*/
412	dbgfR3EventSetStoppedInHyperFlag(pVM, enmEvent);
413	#ifdef VBOX_WITH_REM
414	if (!pVM->dbgf.s.fStoppedInHyper)
415	REMR3StateUpdate(pVM, pVCpu);
416	#endif
417
418	/*
419	* Look thru pending commands and finish those which make sense now.
420	*/
421	/** @todo Process/purge pending commands. */
422	//int rc = DBGFR3VMMForcedAction(pVM);
423	return VINF_SUCCESS;
424	}
425
426
427	/**
428	* Sends the event in the event buffer.
429	*
430	* @returns VBox status code.
431	* @param pVM Pointer to the VM.
432	*/
433	static int dbgfR3SendEvent(PVM pVM)
434	{
435	int rc = RTSemPing(&pVM->dbgf.s.PingPong);
436	if (RT_SUCCESS(rc))
437	rc = dbgfR3VMMWait(pVM);
438
439	pVM->dbgf.s.fStoppedInHyper = false;
440	/** @todo sync VMM -> REM after exitting the debugger. everything may change while in the debugger! */
441	return rc;
442	}
443
444
445	/**
446	* Send a generic debugger event which takes no data.
447	*
448	* @returns VBox status.
449	* @param pVM Pointer to the VM.
450	* @param enmEvent The event to send.
451	*/
452	VMMR3DECL(int) DBGFR3Event(PVM pVM, DBGFEVENTTYPE enmEvent)
453	{
454	int rc = dbgfR3EventPrologue(pVM, enmEvent);
455	if (RT_FAILURE(rc))
456	return rc;
457
458	/*
459	* Send the event and process the reply communication.
460	*/
461	pVM->dbgf.s.DbgEvent.enmType = enmEvent;
462	pVM->dbgf.s.DbgEvent.enmCtx = dbgfR3FigureEventCtx(pVM);
463	return dbgfR3SendEvent(pVM);
464	}
465
466
467	/**
468	* Send a debugger event which takes the full source file location.
469	*
470	* @returns VBox status.
471	* @param pVM Pointer to the VM.
472	* @param enmEvent The event to send.
473	* @param pszFile Source file.
474	* @param uLine Line number in source file.
475	* @param pszFunction Function name.
476	* @param pszFormat Message which accompanies the event.
477	* @param ... Message arguments.
478	*/
479	VMMR3DECL(int) DBGFR3EventSrc(PVM pVM, DBGFEVENTTYPE enmEvent, const char pszFile, unsigned uLine, const char pszFunction, const char *pszFormat, ...)
480	{
481	va_list args;
482	va_start(args, pszFormat);
483	int rc = DBGFR3EventSrcV(pVM, enmEvent, pszFile, uLine, pszFunction, pszFormat, args);
484	va_end(args);
485	return rc;
486	}
487
488
489	/**
490	* Send a debugger event which takes the full source file location.
491	*
492	* @returns VBox status.
493	* @param pVM Pointer to the VM.
494	* @param enmEvent The event to send.
495	* @param pszFile Source file.
496	* @param uLine Line number in source file.
497	* @param pszFunction Function name.
498	* @param pszFormat Message which accompanies the event.
499	* @param args Message arguments.
500	*/
501	VMMR3DECL(int) DBGFR3EventSrcV(PVM pVM, DBGFEVENTTYPE enmEvent, const char pszFile, unsigned uLine, const char pszFunction, const char *pszFormat, va_list args)
502	{
503	int rc = dbgfR3EventPrologue(pVM, enmEvent);
504	if (RT_FAILURE(rc))
505	return rc;
506
507	/*
508	* Format the message.
509	*/
510	char *pszMessage = NULL;
511	char szMessage[8192];
512	if (pszFormat && *pszFormat)
513	{
514	pszMessage = &szMessage[0];
515	RTStrPrintfV(szMessage, sizeof(szMessage), pszFormat, args);
516	}
517
518	/*
519	* Send the event and process the reply communication.
520	*/
521	pVM->dbgf.s.DbgEvent.enmType = enmEvent;
522	pVM->dbgf.s.DbgEvent.enmCtx = dbgfR3FigureEventCtx(pVM);
523	pVM->dbgf.s.DbgEvent.u.Src.pszFile = pszFile;
524	pVM->dbgf.s.DbgEvent.u.Src.uLine = uLine;
525	pVM->dbgf.s.DbgEvent.u.Src.pszFunction = pszFunction;
526	pVM->dbgf.s.DbgEvent.u.Src.pszMessage = pszMessage;
527	return dbgfR3SendEvent(pVM);
528	}
529
530
531	/**
532	* Send a debugger event which takes the two assertion messages.
533	*
534	* @returns VBox status.
535	* @param pVM Pointer to the VM.
536	* @param enmEvent The event to send.
537	* @param pszMsg1 First assertion message.
538	* @param pszMsg2 Second assertion message.
539	*/
540	VMMR3DECL(int) DBGFR3EventAssertion(PVM pVM, DBGFEVENTTYPE enmEvent, const char pszMsg1, const char pszMsg2)
541	{
542	int rc = dbgfR3EventPrologue(pVM, enmEvent);
543	if (RT_FAILURE(rc))
544	return rc;
545
546	/*
547	* Send the event and process the reply communication.
548	*/
549	pVM->dbgf.s.DbgEvent.enmType = enmEvent;
550	pVM->dbgf.s.DbgEvent.enmCtx = dbgfR3FigureEventCtx(pVM);
551	pVM->dbgf.s.DbgEvent.u.Assert.pszMsg1 = pszMsg1;
552	pVM->dbgf.s.DbgEvent.u.Assert.pszMsg2 = pszMsg2;
553	return dbgfR3SendEvent(pVM);
554	}
555
556
557	/**
558	* Breakpoint was hit somewhere.
559	* Figure out which breakpoint it is and notify the debugger.
560	*
561	* @returns VBox status.
562	* @param pVM Pointer to the VM.
563	* @param enmEvent DBGFEVENT_BREAKPOINT_HYPER or DBGFEVENT_BREAKPOINT.
564	*/
565	VMMR3DECL(int) DBGFR3EventBreakpoint(PVM pVM, DBGFEVENTTYPE enmEvent)
566	{
567	int rc = dbgfR3EventPrologue(pVM, enmEvent);
568	if (RT_FAILURE(rc))
569	return rc;
570
571	/*
572	* Send the event and process the reply communication.
573	*/
574	/** @todo SMP */
575	PVMCPU pVCpu = VMMGetCpu0(pVM);
576
577	pVM->dbgf.s.DbgEvent.enmType = enmEvent;
578	RTUINT iBp = pVM->dbgf.s.DbgEvent.u.Bp.iBp = pVCpu->dbgf.s.iActiveBp;
579	pVCpu->dbgf.s.iActiveBp = ~0U;
580	if (iBp != ~0U)
581	pVM->dbgf.s.DbgEvent.enmCtx = DBGFEVENTCTX_RAW;
582	else
583	{
584	/* REM breakpoints has be been searched for. */
585	#if 0 /** @todo get flat PC api! */
586	uint32_t eip = CPUMGetGuestEIP(pVM);
587	#else
588	/* @todo SMP support!! */
589	PCPUMCTX pCtx = CPUMQueryGuestCtxPtr(VMMGetCpu(pVM));
590	RTGCPTR eip = pCtx->rip + pCtx->cs.u64Base;
591	#endif
592	for (size_t i = 0; i < RT_ELEMENTS(pVM->dbgf.s.aBreakpoints); i++)
593	if ( pVM->dbgf.s.aBreakpoints[i].enmType == DBGFBPTYPE_REM
594	&& pVM->dbgf.s.aBreakpoints[i].GCPtr == eip)
595	{
596	pVM->dbgf.s.DbgEvent.u.Bp.iBp = pVM->dbgf.s.aBreakpoints[i].iBp;
597	break;
598	}
599	AssertMsg(pVM->dbgf.s.DbgEvent.u.Bp.iBp != ~0U, ("eip=%08x\n", eip));
600	pVM->dbgf.s.DbgEvent.enmCtx = DBGFEVENTCTX_REM;
601	}
602	return dbgfR3SendEvent(pVM);
603	}
604
605
606	/**
607	* Waits for the debugger to respond.
608	*
609	* @returns VBox status. (clearify)
610	* @param pVM Pointer to the VM.
611	*/
612	static int dbgfR3VMMWait(PVM pVM)
613	{
614	PVMCPU pVCpu = VMMGetCpu(pVM);
615
616	LogFlow(("dbgfR3VMMWait:\n"));
617
618	/** @todo stupid GDT/LDT sync hack. go away! */
619	SELMR3UpdateFromCPUM(pVM, pVCpu);
620	int rcRet = VINF_SUCCESS;
621
622	/*
623	* Waits for the debugger to reply (i.e. issue an command).
624	*/
625	for (;;)
626	{
627	/*
628	* Wait.
629	*/
630	uint32_t cPollHack = 1; /** @todo this interface is horrible now that we're using lots of VMR3ReqCall stuff all over DBGF. */
631	for (;;)
632	{
633	int rc;
634	if ( !VM_FF_ISPENDING(pVM, VM_FF_EMT_RENDEZVOUS \| VM_FF_REQUEST)
635	&& !VMCPU_FF_ISPENDING(pVCpu, VMCPU_FF_REQUEST))
636	{
637	rc = RTSemPingWait(&pVM->dbgf.s.PingPong, cPollHack);
638	if (RT_SUCCESS(rc))
639	break;
640	if (rc != VERR_TIMEOUT)
641	{
642	LogFlow(("dbgfR3VMMWait: returns %Rrc\n", rc));
643	return rc;
644	}
645	}
646
647	if (VM_FF_ISPENDING(pVM, VM_FF_EMT_RENDEZVOUS))
648	{
649	rc = VMMR3EmtRendezvousFF(pVM, pVCpu);
650	cPollHack = 1;
651	}
652	else if ( VM_FF_ISPENDING(pVM, VM_FF_REQUEST)
653	\|\| VMCPU_FF_ISPENDING(pVCpu, VMCPU_FF_REQUEST))
654	{
655	LogFlow(("dbgfR3VMMWait: Processes requests...\n"));
656	rc = VMR3ReqProcessU(pVM->pUVM, VMCPUID_ANY, false /fPriorityOnly/);
657	if (rc == VINF_SUCCESS)
658	rc = VMR3ReqProcessU(pVM->pUVM, pVCpu->idCpu, false /fPriorityOnly/);
659	LogFlow(("dbgfR3VMMWait: VMR3ReqProcess -> %Rrc rcRet=%Rrc\n", rc, rcRet));
660	cPollHack = 1;
661	}
662	else
663	{
664	rc = VINF_SUCCESS;
665	if (cPollHack < 120)
666	cPollHack++;
667	}
668
669	if (rc >= VINF_EM_FIRST && rc <= VINF_EM_LAST)
670	{
671	switch (rc)
672	{
673	case VINF_EM_DBG_BREAKPOINT:
674	case VINF_EM_DBG_STEPPED:
675	case VINF_EM_DBG_STEP:
676	case VINF_EM_DBG_STOP:
677	AssertMsgFailed(("rc=%Rrc\n", rc));
678	break;
679
680	/* return straight away */
681	case VINF_EM_TERMINATE:
682	case VINF_EM_OFF:
683	LogFlow(("dbgfR3VMMWait: returns %Rrc\n", rc));
684	return rc;
685
686	/* remember return code. */
687	default:
688	AssertReleaseMsgFailed(("rc=%Rrc is not in the switch!\n", rc));
689	case VINF_EM_RESET:
690	case VINF_EM_SUSPEND:
691	case VINF_EM_HALT:
692	case VINF_EM_RESUME:
693	case VINF_EM_RESCHEDULE:
694	case VINF_EM_RESCHEDULE_REM:
695	case VINF_EM_RESCHEDULE_RAW:
696	if (rc < rcRet \|\| rcRet == VINF_SUCCESS)
697	rcRet = rc;
698	break;
699	}
700	}
701	else if (RT_FAILURE(rc))
702	{
703	LogFlow(("dbgfR3VMMWait: returns %Rrc\n", rc));
704	return rc;
705	}
706	}
707
708	/*
709	* Process the command.
710	*/
711	bool fResumeExecution;
712	DBGFCMDDATA CmdData = pVM->dbgf.s.VMMCmdData;
713	DBGFCMD enmCmd = dbgfR3SetCmd(pVM, DBGFCMD_NO_COMMAND);
714	int rc = dbgfR3VMMCmd(pVM, enmCmd, &CmdData, &fResumeExecution);
715	if (fResumeExecution)
716	{
717	if (RT_FAILURE(rc))
718	rcRet = rc;
719	else if ( rc >= VINF_EM_FIRST
720	&& rc <= VINF_EM_LAST
721	&& (rc < rcRet \|\| rcRet == VINF_SUCCESS))
722	rcRet = rc;
723	LogFlow(("dbgfR3VMMWait: returns %Rrc\n", rcRet));
724	return rcRet;
725	}
726	}
727	}
728
729
730	/**
731	* Executes command from debugger.
732	* The caller is responsible for waiting or resuming execution based on the
733	* value returned in the *pfResumeExecution indicator.
734	*
735	* @returns VBox status. (clearify!)
736	* @param pVM Pointer to the VM.
737	* @param enmCmd The command in question.
738	* @param pCmdData Pointer to the command data.
739	* @param pfResumeExecution Where to store the resume execution / continue waiting indicator.
740	*/
741	static int dbgfR3VMMCmd(PVM pVM, DBGFCMD enmCmd, PDBGFCMDDATA pCmdData, bool *pfResumeExecution)
742	{
743	bool fSendEvent;
744	bool fResume;
745	int rc = VINF_SUCCESS;
746
747	NOREF(pCmdData); /* for later */
748
749	switch (enmCmd)
750	{
751	/*
752	* Halt is answered by an event say that we've halted.
753	*/
754	case DBGFCMD_HALT:
755	{
756	pVM->dbgf.s.DbgEvent.enmType = DBGFEVENT_HALT_DONE;
757	pVM->dbgf.s.DbgEvent.enmCtx = dbgfR3FigureEventCtx(pVM);
758	fSendEvent = true;
759	fResume = false;
760	break;
761	}
762
763
764	/*
765	* Resume is not answered we'll just resume execution.
766	*/
767	case DBGFCMD_GO:
768	{
769	fSendEvent = false;
770	fResume = true;
771	break;
772	}
773
774	/** @todo implement (and define) the rest of the commands. */
775
776	/*
777	* Disable breakpoints and stuff.
778	* Send an everythings cool event to the debugger thread and resume execution.
779	*/
780	case DBGFCMD_DETACH_DEBUGGER:
781	{
782	ASMAtomicWriteBool(&pVM->dbgf.s.fAttached, false);
783	pVM->dbgf.s.DbgEvent.enmType = DBGFEVENT_DETACH_DONE;
784	pVM->dbgf.s.DbgEvent.enmCtx = DBGFEVENTCTX_OTHER;
785	fSendEvent = true;
786	fResume = true;
787	break;
788	}
789
790	/*
791	* The debugger has detached successfully.
792	* There is no reply to this event.
793	*/
794	case DBGFCMD_DETACHED_DEBUGGER:
795	{
796	fSendEvent = false;
797	fResume = true;
798	break;
799	}
800
801	/*
802	* Single step, with trace into.
803	*/
804	case DBGFCMD_SINGLE_STEP:
805	{
806	Log2(("Single step\n"));
807	rc = VINF_EM_DBG_STEP;
808	/** @todo SMP */
809	PVMCPU pVCpu = VMMGetCpu0(pVM);
810	pVCpu->dbgf.s.fSingleSteppingRaw = true;
811	fSendEvent = false;
812	fResume = true;
813	break;
814	}
815
816	/*
817	* Default is to send an invalid command event.
818	*/
819	default:
820	{
821	pVM->dbgf.s.DbgEvent.enmType = DBGFEVENT_INVALID_COMMAND;
822	pVM->dbgf.s.DbgEvent.enmCtx = dbgfR3FigureEventCtx(pVM);
823	fSendEvent = true;
824	fResume = false;
825	break;
826	}
827	}
828
829	/*
830	* Send pending event.
831	*/
832	if (fSendEvent)
833	{
834	Log2(("DBGF: Emulation thread: sending event %d\n", pVM->dbgf.s.DbgEvent.enmType));
835	int rc2 = RTSemPing(&pVM->dbgf.s.PingPong);
836	if (RT_FAILURE(rc2))
837	{
838	AssertRC(rc2);
839	*pfResumeExecution = true;
840	return rc2;
841	}
842	}
843
844	/*
845	* Return.
846	*/
847	*pfResumeExecution = fResume;
848	return rc;
849	}
850
851
852	/**
853	* Attaches a debugger to the specified VM.
854	*
855	* Only one debugger at a time.
856	*
857	* @returns VBox status code.
858	* @param pVM Pointer to the VM.
859	*/
860	VMMR3DECL(int) DBGFR3Attach(PVM pVM)
861	{
862	VM_ASSERT_VALID_EXT_RETURN(pVM, VERR_INVALID_VM_HANDLE);
863
864	/*
865	* Call the VM, use EMT for serialization.
866	*/
867	/** @todo SMP */
868	return VMR3ReqCallWait(pVM, VMCPUID_ANY, (PFNRT)dbgfR3Attach, 1, pVM);
869	}
870
871
872	/**
873	* EMT worker for DBGFR3Attach.
874	*
875	* @returns VBox status code.
876	* @param pVM Pointer to the VM.
877	*/
878	static DECLCALLBACK(int) dbgfR3Attach(PVM pVM)
879	{
880	if (pVM->dbgf.s.fAttached)
881	{
882	Log(("dbgR3Attach: Debugger already attached\n"));
883	return VERR_DBGF_ALREADY_ATTACHED;
884	}
885
886	/*
887	* Create the Ping-Pong structure.
888	*/
889	int rc = RTSemPingPongInit(&pVM->dbgf.s.PingPong);
890	AssertRCReturn(rc, rc);
891
892	/*
893	* Set the attached flag.
894	*/
895	ASMAtomicWriteBool(&pVM->dbgf.s.fAttached, true);
896	return VINF_SUCCESS;
897	}
898
899
900	/**
901	* Detaches a debugger from the specified VM.
902	*
903	* Caller must be attached to the VM.
904	*
905	* @returns VBox status code.
906	* @param pVM Pointer to the VM.
907	*/
908	VMMR3DECL(int) DBGFR3Detach(PVM pVM)
909	{
910	LogFlow(("DBGFR3Detach:\n"));
911	int rc;
912
913	/*
914	* Check if attached.
915	*/
916	AssertReturn(pVM->dbgf.s.fAttached, VERR_DBGF_NOT_ATTACHED);
917
918	/*
919	* Try send the detach command.
920	* Keep in mind that we might be racing EMT, so, be extra careful.
921	*/
922	DBGFCMD enmCmd = dbgfR3SetCmd(pVM, DBGFCMD_DETACH_DEBUGGER);
923	if (RTSemPongIsSpeaker(&pVM->dbgf.s.PingPong))
924	{
925	rc = RTSemPong(&pVM->dbgf.s.PingPong);
926	AssertMsgRCReturn(rc, ("Failed to signal emulation thread. rc=%Rrc\n", rc), rc);
927	LogRel(("DBGFR3Detach: enmCmd=%d (pong -> ping)\n", enmCmd));
928	}
929
930	/*
931	* Wait for the OK event.
932	*/
933	rc = RTSemPongWait(&pVM->dbgf.s.PingPong, RT_INDEFINITE_WAIT);
934	AssertLogRelMsgRCReturn(rc, ("Wait on detach command failed, rc=%Rrc\n", rc), rc);
935
936	/*
937	* Send the notification command indicating that we're really done.
938	*/
939	enmCmd = dbgfR3SetCmd(pVM, DBGFCMD_DETACHED_DEBUGGER);
940	rc = RTSemPong(&pVM->dbgf.s.PingPong);
941	AssertMsgRCReturn(rc, ("Failed to signal emulation thread. rc=%Rrc\n", rc), rc);
942
943	LogFlowFunc(("returns VINF_SUCCESS\n"));
944	return VINF_SUCCESS;
945	}
946
947
948	/**
949	* Wait for a debug event.
950	*
951	* @returns VBox status. Will not return VBOX_INTERRUPTED.
952	* @param pVM Pointer to the VM.
953	* @param cMillies Number of millis to wait.
954	* @param ppEvent Where to store the event pointer.
955	*/
956	VMMR3DECL(int) DBGFR3EventWait(PVM pVM, RTMSINTERVAL cMillies, PCDBGFEVENT *ppEvent)
957	{
958	/*
959	* Check state.
960	*/
961	AssertReturn(pVM->dbgf.s.fAttached, VERR_DBGF_NOT_ATTACHED);
962	*ppEvent = NULL;
963
964	/*
965	* Wait.
966	*/
967	int rc = RTSemPongWait(&pVM->dbgf.s.PingPong, cMillies);
968	if (RT_SUCCESS(rc))
969	{
970	*ppEvent = &pVM->dbgf.s.DbgEvent;
971	Log2(("DBGF: Debugger thread: receiving event %d\n", (*ppEvent)->enmType));
972	return VINF_SUCCESS;
973	}
974
975	return rc;
976	}
977
978
979	/**
980	* Halts VM execution.
981	*
982	* After calling this the VM isn't actually halted till an DBGFEVENT_HALT_DONE
983	* arrives. Until that time it's not possible to issue any new commands.
984	*
985	* @returns VBox status.
986	* @param pVM Pointer to the VM.
987	*/
988	VMMR3DECL(int) DBGFR3Halt(PVM pVM)
989	{
990	/*
991	* Check state.
992	*/
993	AssertReturn(pVM->dbgf.s.fAttached, VERR_DBGF_NOT_ATTACHED);
994	RTPINGPONGSPEAKER enmSpeaker = pVM->dbgf.s.PingPong.enmSpeaker;
995	if ( enmSpeaker == RTPINGPONGSPEAKER_PONG
996	\|\| enmSpeaker == RTPINGPONGSPEAKER_PONG_SIGNALED)
997	return VWRN_DBGF_ALREADY_HALTED;
998
999	/*
1000	* Send command.
1001	*/
1002	dbgfR3SetCmd(pVM, DBGFCMD_HALT);
1003
1004	return VINF_SUCCESS;
1005	}
1006
1007
1008	/**
1009	* Checks if the VM is halted by the debugger.
1010	*
1011	* @returns True if halted.
1012	* @returns False if not halted.
1013	* @param pVM Pointer to the VM.
1014	*/
1015	VMMR3DECL(bool) DBGFR3IsHalted(PVM pVM)
1016	{
1017	AssertReturn(pVM->dbgf.s.fAttached, false);
1018	RTPINGPONGSPEAKER enmSpeaker = pVM->dbgf.s.PingPong.enmSpeaker;
1019	return enmSpeaker == RTPINGPONGSPEAKER_PONG_SIGNALED
1020	\|\| enmSpeaker == RTPINGPONGSPEAKER_PONG;
1021	}
1022
1023
1024	/**
1025	* Checks if the debugger can wait for events or not.
1026	*
1027	* This function is only used by lazy, multiplexing debuggers. :-)
1028	*
1029	* @returns True if waitable.
1030	* @returns False if not waitable.
1031	* @param pVM Pointer to the VM.
1032	*/
1033	VMMR3DECL(bool) DBGFR3CanWait(PVM pVM)
1034	{
1035	AssertReturn(pVM->dbgf.s.fAttached, false);
1036	return RTSemPongShouldWait(&pVM->dbgf.s.PingPong);
1037	}
1038
1039
1040	/**
1041	* Resumes VM execution.
1042	*
1043	* There is no receipt event on this command.
1044	*
1045	* @returns VBox status.
1046	* @param pVM Pointer to the VM.
1047	*/
1048	VMMR3DECL(int) DBGFR3Resume(PVM pVM)
1049	{
1050	/*
1051	* Check state.
1052	*/
1053	AssertReturn(pVM->dbgf.s.fAttached, VERR_DBGF_NOT_ATTACHED);
1054	AssertReturn(RTSemPongIsSpeaker(&pVM->dbgf.s.PingPong), VERR_SEM_OUT_OF_TURN);
1055
1056	/*
1057	* Send the ping back to the emulation thread telling it to run.
1058	*/
1059	dbgfR3SetCmd(pVM, DBGFCMD_GO);
1060	int rc = RTSemPong(&pVM->dbgf.s.PingPong);
1061	AssertRC(rc);
1062
1063	return rc;
1064	}
1065
1066
1067	/**
1068	* Step Into.
1069	*
1070	* A single step event is generated from this command.
1071	* The current implementation is not reliable, so don't rely on the event coming.
1072	*
1073	* @returns VBox status.
1074	* @param pVM Pointer to the VM.
1075	* @param idCpu The ID of the CPU to single step on.
1076	*/
1077	VMMR3DECL(int) DBGFR3Step(PVM pVM, VMCPUID idCpu)
1078	{
1079	/*
1080	* Check state.
1081	*/
1082	AssertReturn(pVM->dbgf.s.fAttached, VERR_DBGF_NOT_ATTACHED);
1083	AssertReturn(RTSemPongIsSpeaker(&pVM->dbgf.s.PingPong), VERR_SEM_OUT_OF_TURN);
1084	AssertReturn(idCpu < pVM->cCpus, VERR_INVALID_PARAMETER);
1085
1086	/*
1087	* Send the ping back to the emulation thread telling it to run.
1088	*/
1089	/** @todo SMP (idCpu) */
1090	dbgfR3SetCmd(pVM, DBGFCMD_SINGLE_STEP);
1091	int rc = RTSemPong(&pVM->dbgf.s.PingPong);
1092	AssertRC(rc);
1093	return rc;
1094	}
1095
1096
1097	/**
1098	* Call this to single step programmatically.
1099	*
1100	* You must pass down the return code to the EM loop! That's
1101	* where the actual single stepping take place (at least in the
1102	* current implementation).
1103	*
1104	* @returns VINF_EM_DBG_STEP
1105	*
1106	* @param pVCpu Pointer to the VMCPU.
1107	*
1108	* @thread VCpu EMT
1109	*/
1110	VMMR3DECL(int) DBGFR3PrgStep(PVMCPU pVCpu)
1111	{
1112	VMCPU_ASSERT_EMT(pVCpu);
1113
1114	pVCpu->dbgf.s.fSingleSteppingRaw = true;
1115	return VINF_EM_DBG_STEP;
1116	}
1117

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source: vbox/trunk/src/VBox/VMM/VMMR3/DBGF.cpp@ 42833

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