DBGFAllBp.cpp@ 107044

Last change on this file since 107044 was 106369, checked in by vboxsync, 5 weeks ago
VMM/DBGF: Prepare DBGF to support ARMv8/A64 style breakpoints for the VMM debugger. This converts the x86 centric int3 naming to software breakpoint, bugref:10393 [x86 build fix]
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1	/* $Id: DBGFAllBp.cpp 106369 2024-10-16 13:19:45Z vboxsync $ */
2	/** @file
3	* DBGF - Debugger Facility, All Context breakpoint management part.
4	*/
5
6	/*
7	* Copyright (C) 2006-2024 Oracle and/or its affiliates.
8	*
9	* This file is part of VirtualBox base platform packages, as
10	* available from https://www.virtualbox.org.
11	*
12	* This program is free software; you can redistribute it and/or
13	* modify it under the terms of the GNU General Public License
14	* as published by the Free Software Foundation, in version 3 of the
15	* License.
16	*
17	* This program is distributed in the hope that it will be useful, but
18	* WITHOUT ANY WARRANTY; without even the implied warranty of
19	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
20	* General Public License for more details.
21	*
22	* You should have received a copy of the GNU General Public License
23	* along with this program; if not, see <https://www.gnu.org/licenses>.
24	*
25	* SPDX-License-Identifier: GPL-3.0-only
26	*/
27
28
29	/*********************************************************************************************************************************
30	* Header Files *
31	*********************************************************************************************************************************/
32	#define LOG_GROUP LOG_GROUP_DBGF
33	#define VMCPU_INCL_CPUM_GST_CTX
34	#include <VBox/vmm/dbgf.h>
35	#include <VBox/vmm/iem.h>
36	#include <VBox/vmm/pgm.h>
37	#include <VBox/vmm/selm.h>
38	#include <VBox/log.h>
39	#include "DBGFInternal.h"
40	#include <VBox/vmm/vmcc.h>
41	#include <VBox/err.h>
42	#include <iprt/assert.h>
43
44	#include "DBGFInline.h"
45
46
47	#ifdef IN_RC
48	# error "You lucky person have the pleasure to implement the raw mode part for this!"
49	#endif
50
51
52	/**
53	* Returns the internal breakpoint state for the given handle.
54	*
55	* @returns Pointer to the internal breakpoint state or NULL if the handle is invalid.
56	* @param pVM The ring-0 VM structure pointer.
57	* @param hBp The breakpoint handle to resolve.
58	* @param ppBpR0 Where to store the pointer to the ring-0 only part of the breakpoint
59	* on success, optional.
60	*/
61	#ifdef IN_RING0
62	DECLINLINE(PDBGFBPINT) dbgfBpGetByHnd(PVMCC pVM, DBGFBP hBp, PDBGFBPINTR0 *ppBpR0)
63	#else
64	DECLINLINE(PDBGFBPINT) dbgfBpGetByHnd(PVMCC pVM, DBGFBP hBp)
65	#endif
66	{
67	uint32_t idChunk = DBGF_BP_HND_GET_CHUNK_ID(hBp);
68	uint32_t idxEntry = DBGF_BP_HND_GET_ENTRY(hBp);
69
70	AssertReturn(idChunk < DBGF_BP_CHUNK_COUNT, NULL);
71	AssertReturn(idxEntry < DBGF_BP_COUNT_PER_CHUNK, NULL);
72
73	#ifdef IN_RING0
74	PDBGFBPCHUNKR0 pBpChunk = &pVM->dbgfr0.s.aBpChunks[idChunk];
75	AssertPtrReturn(pBpChunk->CTX_SUFF(paBpBaseShared), NULL);
76
77	if (ppBpR0)
78	*ppBpR0 = &pBpChunk->paBpBaseR0Only[idxEntry];
79	return &pBpChunk->CTX_SUFF(paBpBaseShared)[idxEntry];
80
81	#elif defined(IN_RING3)
82	PUVM pUVM = pVM->pUVM;
83	PDBGFBPCHUNKR3 pBpChunk = &pUVM->dbgf.s.aBpChunks[idChunk];
84	AssertPtrReturn(pBpChunk->CTX_SUFF(pBpBase), NULL);
85
86	return &pBpChunk->CTX_SUFF(pBpBase)[idxEntry];
87
88	#else
89	# error "Unsupported context"
90	#endif
91	}
92
93
94	/**
95	* Returns the pointer to the L2 table entry from the given index.
96	*
97	* @returns Current context pointer to the L2 table entry or NULL if the provided index value is invalid.
98	* @param pVM The cross context VM structure.
99	* @param idxL2 The L2 table index to resolve.
100	*
101	* @note The content of the resolved L2 table entry is not validated!.
102	*/
103	DECLINLINE(PCDBGFBPL2ENTRY) dbgfBpL2GetByIdx(PVMCC pVM, uint32_t idxL2)
104	{
105	uint32_t idChunk = DBGF_BP_L2_IDX_GET_CHUNK_ID(idxL2);
106	uint32_t idxEntry = DBGF_BP_L2_IDX_GET_ENTRY(idxL2);
107
108	AssertReturn(idChunk < DBGF_BP_L2_TBL_CHUNK_COUNT, NULL);
109	AssertReturn(idxEntry < DBGF_BP_L2_TBL_ENTRIES_PER_CHUNK, NULL);
110
111	#ifdef IN_RING0
112	PDBGFBPL2TBLCHUNKR0 pL2Chunk = &pVM->dbgfr0.s.aBpL2TblChunks[idChunk];
113	AssertPtrReturn(pL2Chunk->CTX_SUFF(paBpL2TblBaseShared), NULL);
114
115	return &pL2Chunk->CTX_SUFF(paBpL2TblBaseShared)[idxEntry];
116	#elif defined(IN_RING3)
117	PUVM pUVM = pVM->pUVM;
118	PDBGFBPL2TBLCHUNKR3 pL2Chunk = &pUVM->dbgf.s.aBpL2TblChunks[idChunk];
119	AssertPtrReturn(pL2Chunk->pbmAlloc, NULL);
120	AssertReturn(ASMBitTest(pL2Chunk->pbmAlloc, idxEntry), NULL);
121
122	return &pL2Chunk->CTX_SUFF(pL2Base)[idxEntry];
123	#endif
124	}
125
126
127	#ifdef IN_RING0
128	/**
129	* Returns the internal breakpoint owner state for the given handle.
130	*
131	* @returns Pointer to the internal ring-0 breakpoint owner state or NULL if the handle is invalid.
132	* @param pVM The cross context VM structure.
133	* @param hBpOwner The breakpoint owner handle to resolve.
134	*/
135	DECLINLINE(PCDBGFBPOWNERINTR0) dbgfR0BpOwnerGetByHnd(PVMCC pVM, DBGFBPOWNER hBpOwner)
136	{
137	if (hBpOwner == NIL_DBGFBPOWNER)
138	return NULL;
139
140	AssertReturn(hBpOwner < DBGF_BP_OWNER_COUNT_MAX, NULL);
141
142	PCDBGFBPOWNERINTR0 pBpOwnerR0 = &pVM->dbgfr0.s.paBpOwnersR0[hBpOwner];
143	AssertReturn(pBpOwnerR0->cRefs > 1, NULL);
144
145	return pBpOwnerR0;
146	}
147	#endif
148
149
150	/**
151	* Executes the actions associated with the given breakpoint.
152	*
153	* @returns VBox status code.
154	* @param pVM The cross context VM structure.
155	* @param pVCpu The cross context virtual CPU structure.
156	* @param pCtx Pointer to the register context for the CPU.
157	* @param hBp The breakpoint handle which hit.
158	* @param pBp The shared breakpoint state.
159	* @param pBpR0 The ring-0 only breakpoint state.
160	*/
161	#ifdef IN_RING0
162	DECLINLINE(int) dbgfBpHit(PVMCC pVM, PVMCPUCC pVCpu, PCPUMCTX pCtx, DBGFBP hBp, PDBGFBPINT pBp, PDBGFBPINTR0 pBpR0)
163	#else
164	DECLINLINE(int) dbgfBpHit(PVMCC pVM, PVMCPUCC pVCpu, PCPUMCTX pCtx, DBGFBP hBp, PDBGFBPINT pBp)
165	#endif
166	{
167	uint64_t cHits = ASMAtomicIncU64(&pBp->Pub.cHits); RT_NOREF(cHits);
168
169	RT_NOREF(pCtx);
170	#ifdef VBOX_VMM_TARGET_ARMV8
171	LogFlow(("dbgfBpHit: hit breakpoint %u at %RGv cHits=0x%RX64\n", hBp, pCtx->Pc.u64, cHits));
172	#else
173	LogFlow(("dbgfBpHit: hit breakpoint %u at %04x:%RGv cHits=0x%RX64\n", hBp, pCtx->cs.Sel, pCtx->rip, cHits));
174	#endif
175
176	int rc = VINF_EM_DBG_BREAKPOINT;
177	#ifdef IN_RING0
178	PCDBGFBPOWNERINTR0 pBpOwnerR0 = dbgfR0BpOwnerGetByHnd(pVM,
179	pBpR0->fInUse
180	? pBpR0->hOwner
181	: NIL_DBGFBPOWNER);
182	if (pBpOwnerR0)
183	{
184	AssertReturn(pBpOwnerR0->pfnBpIoHitR0, VERR_DBGF_BP_IPE_1);
185
186	VBOXSTRICTRC rcStrict = VINF_SUCCESS;
187
188	if (DBGF_BP_PUB_IS_EXEC_BEFORE(&pBp->Pub))
189	rcStrict = pBpOwnerR0->pfnBpHitR0(pVM, pVCpu->idCpu, pBpR0->pvUserR0, hBp, &pBp->Pub, DBGF_BP_F_HIT_EXEC_BEFORE);
190	if (rcStrict == VINF_SUCCESS)
191	{
192	# ifdef VBOX_VMM_TARGET_ARMV8
193	/** @todo Requires instruction interpreter. */
194	AssertFailed();
195	# else
196	uint8_t abInstr[DBGF_BP_INSN_MAX];
197	RTGCPTR const GCPtrInstr = pVCpu->cpum.GstCtx.rip + pVCpu->cpum.GstCtx.cs.u64Base;
198	rc = PGMPhysSimpleReadGCPtr(pVCpu, &abInstr[0], GCPtrInstr, sizeof(abInstr));
199	AssertRC(rc);
200	if (RT_SUCCESS(rc))
201	{
202	/* Replace the int3 with the original instruction byte. */
203	abInstr[0] = pBp->Pub.u.Sw.Arch.x86.bOrg;
204	rcStrict = IEMExecOneWithPrefetchedByPC(pVCpu, GCPtrInstr, &abInstr[0], sizeof(abInstr));
205	if ( rcStrict == VINF_SUCCESS
206	&& DBGF_BP_PUB_IS_EXEC_AFTER(&pBp->Pub))
207	{
208	rcStrict = pBpOwnerR0->pfnBpHitR0(pVM, pVCpu->idCpu, pBpR0->pvUserR0, hBp, &pBp->Pub, DBGF_BP_F_HIT_EXEC_AFTER);
209	if (rcStrict == VINF_SUCCESS)
210	rc = VINF_SUCCESS;
211	else if ( rcStrict == VINF_DBGF_BP_HALT
212	\|\| rcStrict == VINF_DBGF_R3_BP_OWNER_DEFER)
213	{
214	pVCpu->dbgf.s.hBpActive = hBp;
215	if (rcStrict == VINF_DBGF_R3_BP_OWNER_DEFER)
216	pVCpu->dbgf.s.fBpInvokeOwnerCallback = true;
217	else
218	pVCpu->dbgf.s.fBpInvokeOwnerCallback = false;
219	}
220	else /* Guru meditation. */
221	rc = VERR_DBGF_BP_OWNER_CALLBACK_WRONG_STATUS;
222	}
223	else
224	rc = VBOXSTRICTRC_VAL(rcStrict);
225	#endif
226	}
227	}
228	else if ( rcStrict == VINF_DBGF_BP_HALT
229	\|\| rcStrict == VINF_DBGF_R3_BP_OWNER_DEFER)
230	{
231	pVCpu->dbgf.s.hBpActive = hBp;
232	if (rcStrict == VINF_DBGF_R3_BP_OWNER_DEFER)
233	pVCpu->dbgf.s.fBpInvokeOwnerCallback = true;
234	else
235	pVCpu->dbgf.s.fBpInvokeOwnerCallback = false;
236	}
237	else /* Guru meditation. */
238	rc = VERR_DBGF_BP_OWNER_CALLBACK_WRONG_STATUS;
239	}
240	else
241	{
242	pVCpu->dbgf.s.fBpInvokeOwnerCallback = true; /* Need to check this for ring-3 only owners. */
243	pVCpu->dbgf.s.hBpActive = hBp;
244	}
245	#else
246	RT_NOREF(pVM);
247	pVCpu->dbgf.s.fBpInvokeOwnerCallback = true;
248	pVCpu->dbgf.s.hBpActive = hBp;
249	#endif
250
251	return rc;
252	}
253
254
255	/**
256	* Executes the actions associated with the given port I/O breakpoint.
257	*
258	* @returns VBox status code.
259	* @param pVM The cross context VM structure.
260	* @param pVCpu The cross context virtual CPU structure.
261	* @param fBefore Flag whether the check is done before the access is carried out,
262	* false if it is done after the access.
263	* @param fAccess Access flags, see DBGFBPIOACCESS_XXX.
264	* @param uAddr The address of the access, for port I/O this will hold the port number.
265	* @param uValue The value read or written (the value for reads is only valid when DBGF_BP_F_HIT_EXEC_AFTER is set).
266	* @param hBp The breakpoint handle which hit.
267	* @param pBp The shared breakpoint state.
268	* @param pBpR0 The ring-0 only breakpoint state.
269	*/
270	#ifdef IN_RING0
271	DECLINLINE(VBOXSTRICTRC) dbgfBpPortIoHit(PVMCC pVM, PVMCPU pVCpu, bool fBefore, uint32_t fAccess, uint64_t uAddr, uint64_t uValue,
272	DBGFBP hBp, PDBGFBPINT pBp, PDBGFBPINTR0 pBpR0)
273	#else
274	DECLINLINE(VBOXSTRICTRC) dbgfBpPortIoHit(PVMCC pVM, PVMCPU pVCpu, bool fBefore, uint32_t fAccess, uint64_t uAddr, uint64_t uValue,
275	DBGFBP hBp, PDBGFBPINT pBp)
276	#endif
277	{
278	ASMAtomicIncU64(&pBp->Pub.cHits);
279
280	VBOXSTRICTRC rcStrict = VINF_EM_DBG_BREAKPOINT;
281	#ifdef IN_RING0
282	PCDBGFBPOWNERINTR0 pBpOwnerR0 = dbgfR0BpOwnerGetByHnd(pVM,
283	pBpR0->fInUse
284	? pBpR0->hOwner
285	: NIL_DBGFBPOWNER);
286	if (pBpOwnerR0)
287	{
288	AssertReturn(pBpOwnerR0->pfnBpIoHitR0, VERR_DBGF_BP_IPE_1);
289	rcStrict = pBpOwnerR0->pfnBpIoHitR0(pVM, pVCpu->idCpuUnsafe, pBpR0->pvUserR0, hBp, &pBp->Pub,
290	fBefore
291	? DBGF_BP_F_HIT_EXEC_BEFORE
292	: DBGF_BP_F_HIT_EXEC_AFTER,
293	fAccess, uAddr, uValue);
294	}
295	else
296	{
297	pVCpu->dbgf.s.fBpInvokeOwnerCallback = true; /* Need to check this for ring-3 only owners. */
298	pVCpu->dbgf.s.hBpActive = hBp;
299	pVCpu->dbgf.s.fBpIoActive = true;
300	pVCpu->dbgf.s.fBpIoBefore = fBefore;
301	pVCpu->dbgf.s.uBpIoAddress = uAddr;
302	pVCpu->dbgf.s.fBpIoAccess = fAccess;
303	pVCpu->dbgf.s.uBpIoValue = uValue;
304	}
305	#else
306	/* Resolve owner (can be NIL_DBGFBPOWNER) and invoke callback if there is one. */
307	if (pBp->Pub.hOwner != NIL_DBGFBPOWNER)
308	{
309	PCDBGFBPOWNERINT pBpOwner = dbgfR3BpOwnerGetByHnd(pVM->pUVM, pBp->Pub.hOwner);
310	if (pBpOwner)
311	{
312	AssertReturn(pBpOwner->pfnBpIoHitR3, VERR_DBGF_BP_IPE_1);
313	rcStrict = pBpOwner->pfnBpIoHitR3(pVM, pVCpu->idCpu, pBp->pvUserR3, hBp, &pBp->Pub,
314	fBefore
315	? DBGF_BP_F_HIT_EXEC_BEFORE
316	: DBGF_BP_F_HIT_EXEC_AFTER,
317	fAccess, uAddr, uValue);
318	}
319	}
320	#endif
321	if ( rcStrict == VINF_DBGF_BP_HALT
322	\|\| rcStrict == VINF_DBGF_R3_BP_OWNER_DEFER)
323	{
324	pVCpu->dbgf.s.hBpActive = hBp;
325	if (rcStrict == VINF_DBGF_R3_BP_OWNER_DEFER)
326	pVCpu->dbgf.s.fBpInvokeOwnerCallback = true;
327	else
328	pVCpu->dbgf.s.fBpInvokeOwnerCallback = false;
329	rcStrict = VINF_EM_DBG_BREAKPOINT;
330	}
331	else if ( rcStrict != VINF_SUCCESS
332	&& rcStrict != VINF_EM_DBG_BREAKPOINT)
333	rcStrict = VERR_DBGF_BP_OWNER_CALLBACK_WRONG_STATUS; /* Guru meditation. */
334
335	return rcStrict;
336	}
337
338
339	/**
340	* Walks the L2 table starting at the given root index searching for the given key.
341	*
342	* @returns VBox status code.
343	* @param pVM The cross context VM structure.
344	* @param pVCpu The cross context virtual CPU structure.
345	* @param pCtx Pointer to the register context for the CPU.
346	* @param idxL2Root L2 table index of the table root.
347	* @param GCPtrKey The key to search for.
348	*/
349	static int dbgfBpL2Walk(PVMCC pVM, PVMCPUCC pVCpu, PCPUMCTX pCtx, uint32_t idxL2Root, RTGCUINTPTR GCPtrKey)
350	{
351	/** @todo We don't use the depth right now but abort the walking after a fixed amount of levels. */
352	uint8_t iDepth = 32;
353	PCDBGFBPL2ENTRY pL2Entry = dbgfBpL2GetByIdx(pVM, idxL2Root);
354
355	while (RT_LIKELY( iDepth-- > 0
356	&& pL2Entry))
357	{
358	/* Make a copy of the entry before verification. */
359	DBGFBPL2ENTRY L2Entry;
360	L2Entry.u64GCPtrKeyAndBpHnd1 = ASMAtomicReadU64((volatile uint64_t *)&pL2Entry->u64GCPtrKeyAndBpHnd1);
361	L2Entry.u64LeftRightIdxDepthBpHnd2 = ASMAtomicReadU64((volatile uint64_t *)&pL2Entry->u64LeftRightIdxDepthBpHnd2);
362
363	RTGCUINTPTR GCPtrL2Entry = DBGF_BP_L2_ENTRY_GET_GCPTR(L2Entry.u64GCPtrKeyAndBpHnd1);
364	if (GCPtrKey == GCPtrL2Entry)
365	{
366	DBGFBP hBp = DBGF_BP_L2_ENTRY_GET_BP_HND(L2Entry.u64GCPtrKeyAndBpHnd1, L2Entry.u64LeftRightIdxDepthBpHnd2);
367
368	/* Query the internal breakpoint state from the handle. */
369	#ifdef IN_RING3
370	PDBGFBPINT pBp = dbgfBpGetByHnd(pVM, hBp);
371	#else
372	PDBGFBPINTR0 pBpR0 = NULL;
373	PDBGFBPINT pBp = dbgfBpGetByHnd(pVM, hBp, &pBpR0);
374	#endif
375	if ( pBp
376	&& DBGF_BP_PUB_GET_TYPE(&pBp->Pub) == DBGFBPTYPE_SOFTWARE)
377	#ifdef IN_RING3
378	return dbgfBpHit(pVM, pVCpu, pCtx, hBp, pBp);
379	#else
380	return dbgfBpHit(pVM, pVCpu, pCtx, hBp, pBp, pBpR0);
381	#endif
382
383	/* The entry got corrupted, just abort. */
384	return VERR_DBGF_BP_L2_LOOKUP_FAILED;
385	}
386
387	/* Not found, get to the next level. */
388	uint32_t idxL2Next = (GCPtrKey < GCPtrL2Entry)
389	? DBGF_BP_L2_ENTRY_GET_IDX_LEFT(L2Entry.u64LeftRightIdxDepthBpHnd2)
390	: DBGF_BP_L2_ENTRY_GET_IDX_RIGHT(L2Entry.u64LeftRightIdxDepthBpHnd2);
391	/* It is genuine guest trap or we hit some assertion if we are at the end. */
392	if (idxL2Next == DBGF_BP_L2_ENTRY_IDX_END)
393	return VINF_EM_RAW_GUEST_TRAP;
394
395	pL2Entry = dbgfBpL2GetByIdx(pVM, idxL2Next);
396	}
397
398	return VERR_DBGF_BP_L2_LOOKUP_FAILED;
399	}
400
401
402	/**
403	* Checks whether there is a port I/O breakpoint for the given range and access size.
404	*
405	* @returns VBox status code.
406	* @retval VINF_EM_DBG_BREAKPOINT means there is a breakpoint pending.
407	* @retval VINF_SUCCESS means everything is fine to continue.
408	* @retval anything else means a fatal error causing a guru meditation.
409	*
410	* @param pVM The current context VM structure.
411	* @param pVCpu The cross context virtual CPU structure.
412	* @param uIoPort The I/O port being accessed.
413	* @param fAccess Appropriate DBGFBPIOACCESS_XXX.
414	* @param uValue The value being written to or read from the device
415	* (The value is only valid for a read when the
416	* call is made after the access, writes are always valid).
417	* @param fBefore Flag whether the check is done before the access is carried out,
418	* false if it is done after the access.
419	*/
420	VMM_INT_DECL(VBOXSTRICTRC) DBGFBpCheckPortIo(PVMCC pVM, PVMCPU pVCpu, RTIOPORT uIoPort,
421	uint32_t fAccess, uint32_t uValue, bool fBefore)
422	{
423	RT_NOREF(uValue); /** @todo Trigger only on specific values. */
424
425	/* Don't trigger in single stepping mode. */
426	if (pVCpu->dbgf.s.fSingleSteppingRaw)
427	return VINF_SUCCESS;
428
429	#if defined(IN_RING0)
430	uint32_t volatile *paBpLocPortIo = pVM->dbgfr0.s.CTX_SUFF(paBpLocPortIo);
431	#elif defined(IN_RING3)
432	PUVM pUVM = pVM->pUVM;
433	uint32_t volatile *paBpLocPortIo = pUVM->dbgf.s.CTX_SUFF(paBpLocPortIo);
434	#else
435	# error "Unsupported host context"
436	#endif
437	if (paBpLocPortIo)
438	{
439	const uint32_t u32Entry = ASMAtomicReadU32(&paBpLocPortIo[uIoPort]);
440	if (u32Entry != DBGF_BP_INT3_L1_ENTRY_TYPE_NULL)
441	{
442	uint8_t u8Type = DBGF_BP_INT3_L1_ENTRY_GET_TYPE(u32Entry);
443	if (RT_LIKELY(u8Type == DBGF_BP_INT3_L1_ENTRY_TYPE_BP_HND))
444	{
445	DBGFBP hBp = DBGF_BP_INT3_L1_ENTRY_GET_BP_HND(u32Entry);
446
447	/* Query the internal breakpoint state from the handle. */
448	#ifdef IN_RING3
449	PDBGFBPINT pBp = dbgfBpGetByHnd(pVM, hBp);
450	#else
451	PDBGFBPINTR0 pBpR0 = NULL;
452	PDBGFBPINT pBp = dbgfBpGetByHnd(pVM, hBp, &pBpR0);
453	#endif
454	if ( pBp
455	&& DBGF_BP_PUB_GET_TYPE(&pBp->Pub) == DBGFBPTYPE_PORT_IO)
456	{
457	if ( uIoPort >= pBp->Pub.u.PortIo.uPort
458	&& uIoPort < pBp->Pub.u.PortIo.uPort + pBp->Pub.u.PortIo.cPorts
459	&& pBp->Pub.u.PortIo.fAccess & fAccess
460	&& ( ( fBefore
461	&& DBGF_BP_PUB_IS_EXEC_BEFORE(&pBp->Pub))
462	\|\| ( !fBefore
463	&& DBGF_BP_PUB_IS_EXEC_AFTER(&pBp->Pub))))
464	#ifdef IN_RING3
465	return dbgfBpPortIoHit(pVM, pVCpu, fBefore, fAccess, uIoPort, uValue, hBp, pBp);
466	#else
467	return dbgfBpPortIoHit(pVM, pVCpu, fBefore, fAccess, uIoPort, uValue, hBp, pBp, pBpR0);
468	#endif
469	/* else: No matching port I/O breakpoint. */
470	}
471	else /* Invalid breakpoint handle or not an port I/O breakpoint. */
472	return VERR_DBGF_BP_L1_LOOKUP_FAILED;
473	}
474	else /* Some invalid type. */
475	return VERR_DBGF_BP_L1_LOOKUP_FAILED;
476	}
477	}
478
479	return VINF_SUCCESS;
480	}
481
482
483	#ifndef VBOX_VMM_TARGET_ARMV8 /** @todo for hardware break-/watchpoints */
484	/**
485	* \#DB (Debug event) handler.
486	*
487	* @returns VBox status code.
488	* VINF_SUCCESS means we completely handled this trap,
489	* other codes are passed execution to host context.
490	*
491	* @param pVM The cross context VM structure.
492	* @param pVCpu The cross context virtual CPU structure.
493	* @param pCtx Pointer to the register context for the CPU.
494	* @param uDr6 The DR6 hypervisor register value.
495	* @param fAltStepping Alternative stepping indicator.
496	*/
497	VMM_INT_DECL(int) DBGFTrap01Handler(PVM pVM, PVMCPU pVCpu, PCPUMCTX pCtx, RTGCUINTREG uDr6, bool fAltStepping)
498	{
499	/** @todo Intel docs say that X86_DR6_BS has the highest priority... */
500	RT_NOREF(pCtx);
501
502	/*
503	* A breakpoint?
504	*/
505	AssertCompile(X86_DR6_B0 == 1 && X86_DR6_B1 == 2 && X86_DR6_B2 == 4 && X86_DR6_B3 == 8);
506	if ( (uDr6 & (X86_DR6_B0 \| X86_DR6_B1 \| X86_DR6_B2 \| X86_DR6_B3))
507	&& pVM->dbgf.s.cEnabledHwBreakpoints > 0)
508	{
509	for (unsigned iBp = 0; iBp < RT_ELEMENTS(pVM->dbgf.s.aHwBreakpoints); iBp++)
510	if ( ((uint32_t)uDr6 & RT_BIT_32(iBp))
511	&& pVM->dbgf.s.aHwBreakpoints[iBp].hBp != NIL_DBGFBP)
512	{
513	pVCpu->dbgf.s.hBpActive = pVM->dbgf.s.aHwBreakpoints[iBp].hBp;
514	pVCpu->dbgf.s.fSingleSteppingRaw = false;
515	LogFlow(("DBGFRZTrap03Handler: hit hw breakpoint %x at %04x:%RGv\n",
516	pVM->dbgf.s.aHwBreakpoints[iBp].hBp, pCtx->cs.Sel, pCtx->rip));
517
518	return VINF_EM_DBG_BREAKPOINT;
519	}
520	}
521
522	/*
523	* Single step?
524	* Are we single stepping or is it the guest?
525	*/
526	if ( (uDr6 & X86_DR6_BS)
527	&& (pVCpu->dbgf.s.fSingleSteppingRaw \|\| fAltStepping))
528	{
529	pVCpu->dbgf.s.fSingleSteppingRaw = false;
530	LogFlow(("DBGFRZTrap01Handler: single step at %04x:%RGv\n", pCtx->cs.Sel, pCtx->rip));
531	return VINF_EM_DBG_STEPPED;
532	}
533
534	LogFlow(("DBGFRZTrap01Handler: guest debug event %#x at %04x:%RGv!\n", (uint32_t)uDr6, pCtx->cs.Sel, pCtx->rip));
535	return VINF_EM_RAW_GUEST_TRAP;
536	}
537	#endif
538
539
540	/**
541	* \#BP (Breakpoint) handler.
542	*
543	* @returns VBox status code.
544	* VINF_SUCCESS means we completely handled this trap,
545	* other codes are passed execution to host context.
546	*
547	* @param pVM The cross context VM structure.
548	* @param pVCpu The cross context virtual CPU structure.
549	* @param pCtx Pointer to the register context for the CPU.
550	*/
551	VMM_INT_DECL(VBOXSTRICTRC) DBGFTrap03Handler(PVMCC pVM, PVMCPUCC pVCpu, PCPUMCTX pCtx)
552	{
553	#if defined(IN_RING0)
554	uint32_t volatile *paBpLocL1 = pVM->dbgfr0.s.CTX_SUFF(paBpLocL1);
555	#elif defined(IN_RING3)
556	PUVM pUVM = pVM->pUVM;
557	uint32_t volatile *paBpLocL1 = pUVM->dbgf.s.CTX_SUFF(paBpLocL1);
558	#else
559	# error "Unsupported host context"
560	#endif
561	if (paBpLocL1)
562	{
563	RTGCPTR GCPtrBp;
564	#ifdef VBOX_VMM_TARGET_ARMV8
565	int rc = VINF_SUCCESS;
566	GCPtrBp = pCtx->Pc.u64;
567	#else
568	int rc = SELMValidateAndConvertCSAddr(pVCpu, pCtx->eflags.u, pCtx->ss.Sel, pCtx->cs.Sel, &pCtx->cs,
569	pCtx->rip /* no -1 outside non-rawmode */, &GCPtrBp);
570	AssertRCReturn(rc, rc);
571	#endif
572
573	const uint16_t idxL1 = DBGF_BP_INT3_L1_IDX_EXTRACT_FROM_ADDR(GCPtrBp);
574	const uint32_t u32L1Entry = ASMAtomicReadU32(&paBpLocL1[idxL1]);
575
576	LogFlowFunc(("GCPtrBp=%RGv idxL1=%u u32L1Entry=%#x\n", GCPtrBp, idxL1, u32L1Entry));
577	if (u32L1Entry != DBGF_BP_INT3_L1_ENTRY_TYPE_NULL)
578	{
579	uint8_t u8Type = DBGF_BP_INT3_L1_ENTRY_GET_TYPE(u32L1Entry);
580	if (u8Type == DBGF_BP_INT3_L1_ENTRY_TYPE_BP_HND)
581	{
582	DBGFBP hBp = DBGF_BP_INT3_L1_ENTRY_GET_BP_HND(u32L1Entry);
583
584	/* Query the internal breakpoint state from the handle. */
585	#ifdef IN_RING3
586	PDBGFBPINT pBp = dbgfBpGetByHnd(pVM, hBp);
587	#else
588	PDBGFBPINTR0 pBpR0 = NULL;
589	PDBGFBPINT pBp = dbgfBpGetByHnd(pVM, hBp, &pBpR0);
590	#endif
591	if ( pBp
592	&& DBGF_BP_PUB_GET_TYPE(&pBp->Pub) == DBGFBPTYPE_SOFTWARE)
593	{
594	if (pBp->Pub.u.Sw.GCPtr == (RTGCUINTPTR)GCPtrBp)
595	#ifdef IN_RING3
596	rc = dbgfBpHit(pVM, pVCpu, pCtx, hBp, pBp);
597	#else
598	rc = dbgfBpHit(pVM, pVCpu, pCtx, hBp, pBp, pBpR0);
599	#endif
600	else
601	rc = VINF_EM_RAW_GUEST_TRAP; /* Genuine guest trap. */
602	}
603	else /* Invalid breakpoint handle or not an int3 breakpoint. */
604	rc = VERR_DBGF_BP_L1_LOOKUP_FAILED;
605	}
606	else if (u8Type == DBGF_BP_INT3_L1_ENTRY_TYPE_L2_IDX)
607	rc = dbgfBpL2Walk(pVM, pVCpu, pCtx, DBGF_BP_INT3_L1_ENTRY_GET_L2_IDX(u32L1Entry),
608	DBGF_BP_INT3_L2_KEY_EXTRACT_FROM_ADDR((RTGCUINTPTR)GCPtrBp));
609	else /* Some invalid type. */
610	rc = VERR_DBGF_BP_L1_LOOKUP_FAILED;
611	}
612	else
613	rc = VINF_EM_RAW_GUEST_TRAP; /* Genuine guest trap. */
614
615	return rc;
616	}
617
618	return VINF_EM_RAW_GUEST_TRAP;
619	}
620

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source: vbox/trunk/src/VBox/VMM/VMMAll/DBGFAllBp.cpp@ 107044

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