DBGFAll.cpp@ 107044

Last change on this file since 107044 was 106362, 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
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1	/* $Id: DBGFAll.cpp 106362 2024-10-16 13:08:09Z vboxsync $ */
2	/** @file
3	* DBGF - Debugger Facility, All Context Code.
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 "DBGFInternal.h"
36	#include <VBox/vmm/cpum.h>
37	#include <VBox/vmm/vmcc.h>
38	#include <VBox/err.h>
39	#include <iprt/assert.h>
40	#include <iprt/asm.h>
41	#include <iprt/stdarg.h>
42
43
44	/*
45	* Check the read-only VM members.
46	*/
47	AssertCompileMembersSameSizeAndOffset(VM, dbgf.s.bmSoftIntBreakpoints, VM, dbgf.ro.bmSoftIntBreakpoints);
48	AssertCompileMembersSameSizeAndOffset(VM, dbgf.s.bmHardIntBreakpoints, VM, dbgf.ro.bmHardIntBreakpoints);
49	AssertCompileMembersSameSizeAndOffset(VM, dbgf.s.bmSelectedEvents, VM, dbgf.ro.bmSelectedEvents);
50	AssertCompileMembersSameSizeAndOffset(VM, dbgf.s.cHardIntBreakpoints, VM, dbgf.ro.cHardIntBreakpoints);
51	AssertCompileMembersSameSizeAndOffset(VM, dbgf.s.cSoftIntBreakpoints, VM, dbgf.ro.cSoftIntBreakpoints);
52	AssertCompileMembersSameSizeAndOffset(VM, dbgf.s.cSelectedEvents, VM, dbgf.ro.cSelectedEvents);
53
54	#if !defined(VBOX_VMM_TARGET_ARMV8)
55
56
57	/**
58	* Gets the hardware breakpoint configuration as DR7.
59	*
60	* @returns DR7 from the DBGF point of view.
61	* @param pVM The cross context VM structure.
62	*/
63	VMM_INT_DECL(RTGCUINTREG) DBGFBpGetDR7(PVM pVM)
64	{
65	RTGCUINTREG uDr7 = X86_DR7_GD \| X86_DR7_GE \| X86_DR7_LE \| X86_DR7_RA1_MASK;
66	for (uint32_t i = 0; i < RT_ELEMENTS(pVM->dbgf.s.aHwBreakpoints); i++)
67	{
68	if ( pVM->dbgf.s.aHwBreakpoints[i].fEnabled
69	&& pVM->dbgf.s.aHwBreakpoints[i].hBp != NIL_DBGFBP)
70	{
71	static const uint8_t s_au8Sizes[8] =
72	{
73	X86_DR7_LEN_BYTE, X86_DR7_LEN_BYTE, X86_DR7_LEN_WORD, X86_DR7_LEN_BYTE,
74	X86_DR7_LEN_DWORD,X86_DR7_LEN_BYTE, X86_DR7_LEN_BYTE, X86_DR7_LEN_QWORD
75	};
76	uDr7 \|= X86_DR7_G(i)
77	\| X86_DR7_RW(i, pVM->dbgf.s.aHwBreakpoints[i].fType)
78	\| X86_DR7_LEN(i, s_au8Sizes[pVM->dbgf.s.aHwBreakpoints[i].cb]);
79	}
80	}
81	return uDr7;
82	}
83
84
85	/**
86	* Gets the address of the hardware breakpoint number 0.
87	*
88	* @returns DR0 from the DBGF point of view.
89	* @param pVM The cross context VM structure.
90	*/
91	VMM_INT_DECL(RTGCUINTREG) DBGFBpGetDR0(PVM pVM)
92	{
93	return pVM->dbgf.s.aHwBreakpoints[0].GCPtr;
94	}
95
96
97	/**
98	* Gets the address of the hardware breakpoint number 1.
99	*
100	* @returns DR1 from the DBGF point of view.
101	* @param pVM The cross context VM structure.
102	*/
103	VMM_INT_DECL(RTGCUINTREG) DBGFBpGetDR1(PVM pVM)
104	{
105	return pVM->dbgf.s.aHwBreakpoints[1].GCPtr;
106	}
107
108
109	/**
110	* Gets the address of the hardware breakpoint number 2.
111	*
112	* @returns DR2 from the DBGF point of view.
113	* @param pVM The cross context VM structure.
114	*/
115	VMM_INT_DECL(RTGCUINTREG) DBGFBpGetDR2(PVM pVM)
116	{
117	return pVM->dbgf.s.aHwBreakpoints[2].GCPtr;
118	}
119
120
121	/**
122	* Gets the address of the hardware breakpoint number 3.
123	*
124	* @returns DR3 from the DBGF point of view.
125	* @param pVM The cross context VM structure.
126	*/
127	VMM_INT_DECL(RTGCUINTREG) DBGFBpGetDR3(PVM pVM)
128	{
129	return pVM->dbgf.s.aHwBreakpoints[3].GCPtr;
130	}
131
132
133	/**
134	* Checks if any of the hardware breakpoints are armed.
135	*
136	* @returns true if armed, false if not.
137	* @param pVM The cross context VM structure.
138	* @remarks Don't call this from CPUMRecalcHyperDRx!
139	*/
140	VMM_INT_DECL(bool) DBGFBpIsHwArmed(PVM pVM)
141	{
142	return pVM->dbgf.s.cEnabledHwBreakpoints > 0;
143	}
144
145
146	/**
147	* Checks if any of the hardware I/O breakpoints are armed.
148	*
149	* @returns true if armed, false if not.
150	* @param pVM The cross context VM structure.
151	* @remarks Don't call this from CPUMRecalcHyperDRx!
152	*/
153	VMM_INT_DECL(bool) DBGFBpIsHwIoArmed(PVM pVM)
154	{
155	return pVM->dbgf.s.cEnabledHwIoBreakpoints > 0;
156	}
157
158
159	/**
160	* Checks if any INT3 breakpoints are armed.
161	*
162	* @returns true if armed, false if not.
163	* @param pVM The cross context VM structure.
164	* @remarks Don't call this from CPUMRecalcHyperDRx!
165	*/
166	VMM_INT_DECL(bool) DBGFBpIsInt3Armed(PVM pVM)
167	{
168	/** @todo There was a todo here and returning false when I (bird) removed
169	* VBOX_WITH_LOTS_OF_DBGF_BPS, so this might not be correct. */
170	return pVM->dbgf.s.cEnabledSwBreakpoints > 0;
171	}
172
173
174	/**
175	* Checks instruction boundrary for guest or hypervisor hardware breakpoints.
176	*
177	* @returns Strict VBox status code. May return DRx register import errors in
178	* addition to the ones detailed.
179	* @retval VINF_SUCCESS no breakpoint.
180	* @retval VINF_EM_DBG_BREAKPOINT hypervisor breakpoint triggered.
181	* @retval VINF_EM_RAW_GUEST_TRAP caller must trigger \#DB trap, DR6 and DR7
182	* have been updated appropriately.
183	*
184	* @param pVM The cross context VM structure.
185	* @param pVCpu The cross context virtual CPU structure of the calling EMT.
186	* @param GCPtrPC The unsegmented PC address.
187	* @param fCheckGuest Whether to include guest breakpoints or not.
188	*/
189	VMM_INT_DECL(VBOXSTRICTRC) DBGFBpCheckInstruction(PVMCC pVM, PVMCPUCC pVCpu, RTGCPTR GCPtrPC, bool fCheckGuest)
190	{
191	CPUM_ASSERT_NOT_EXTRN(pVCpu, CPUMCTX_EXTRN_DR7);
192
193	/*
194	* Check hyper breakpoints first as the VMM debugger has priority over
195	* the guest.
196	*/
197	/** @todo we need some kind of resume flag for these. */
198	if (pVM->dbgf.s.cEnabledHwBreakpoints > 0)
199	for (unsigned iBp = 0; iBp < RT_ELEMENTS(pVM->dbgf.s.aHwBreakpoints); iBp++)
200	{
201	if ( pVM->dbgf.s.aHwBreakpoints[iBp].GCPtr != GCPtrPC
202	\|\| pVM->dbgf.s.aHwBreakpoints[iBp].fType != X86_DR7_RW_EO
203	\|\| pVM->dbgf.s.aHwBreakpoints[iBp].cb != 1
204	\|\| !pVM->dbgf.s.aHwBreakpoints[iBp].fEnabled
205	\|\| pVM->dbgf.s.aHwBreakpoints[iBp].hBp == NIL_DBGFBP)
206	{ /likely/ }
207	else
208	{
209	/* (See also DBGFRZTrap01Handler.) */
210	pVCpu->dbgf.s.hBpActive = pVM->dbgf.s.aHwBreakpoints[iBp].hBp;
211	pVCpu->dbgf.s.fSingleSteppingRaw = false;
212
213	LogFlow(("DBGFBpCheckInstruction: hit hw breakpoint %u at %04x:%RGv (%RGv)\n",
214	iBp, pVCpu->cpum.GstCtx.cs.Sel, pVCpu->cpum.GstCtx.rip, GCPtrPC));
215	return VINF_EM_DBG_BREAKPOINT;
216	}
217	}
218
219	/*
220	* Check the guest.
221	*/
222	if (fCheckGuest)
223	{
224	uint32_t const fDr7 = (uint32_t)pVCpu->cpum.GstCtx.dr[7];
225	if (X86_DR7_ANY_EO_ENABLED(fDr7) && !pVCpu->cpum.GstCtx.eflags.Bits.u1RF)
226	{
227	/*
228	* The CPU (10980XE & 6700K at least) will set the DR6.BPx bits for any
229	* DRx that matches the current PC and is configured as an execution
230	* breakpoint (RWx=EO, LENx=1byte). They don't have to be enabled,
231	* however one that is enabled must match for the #DB to be raised and
232	* DR6 to be modified, of course.
233	*/
234	CPUM_IMPORT_EXTRN_RET(pVCpu, CPUMCTX_EXTRN_DR0_DR3);
235	uint32_t fMatched = 0;
236	uint32_t fEnabled = 0;
237	for (unsigned iBp = 0, uBpMask = 1; iBp < 4; iBp++, uBpMask <<= 1)
238	if (X86_DR7_IS_EO_CFG(fDr7, iBp))
239	{
240	if (fDr7 & X86_DR7_L_G(iBp))
241	fEnabled \|= uBpMask;
242	if (pVCpu->cpum.GstCtx.dr[iBp] == GCPtrPC)
243	fMatched \|= uBpMask;
244	}
245	if (!(fEnabled & fMatched))
246	{ /likely/ }
247	else
248	{
249	/*
250	* Update DR6 and DR7.
251	*
252	* See "AMD64 Architecture Programmer's Manual Volume 2", chapter
253	* 13.1.1.3 for details on DR6 bits. The basics is that the B0..B3
254	* bits are always cleared while the others must be cleared by software.
255	*
256	* The following sub chapters says the GD bit is always cleared when
257	* generating a #DB so the handler can safely access the debug registers.
258	*/
259	CPUM_IMPORT_EXTRN_RET(pVCpu, CPUMCTX_EXTRN_DR6);
260	pVCpu->cpum.GstCtx.dr[6] &= ~X86_DR6_B_MASK;
261	if (pVM->cpum.ro.GuestFeatures.enmCpuVendor != CPUMCPUVENDOR_INTEL)
262	pVCpu->cpum.GstCtx.dr[6] \|= fMatched & fEnabled;
263	else
264	pVCpu->cpum.GstCtx.dr[6] \|= fMatched; /* Intel: All matched, regardless of whether they're enabled or not */
265	pVCpu->cpum.GstCtx.dr[7] &= ~X86_DR7_GD;
266	LogFlow(("DBGFBpCheckInstruction: hit hw breakpoints %#x at %04x:%RGv (%RGv)\n",
267	fMatched, pVCpu->cpum.GstCtx.cs.Sel, pVCpu->cpum.GstCtx.rip, GCPtrPC));
268	return VINF_EM_RAW_GUEST_TRAP;
269	}
270	}
271	}
272	return VINF_SUCCESS;
273	}
274
275
276	/**
277	* Common worker for DBGFBpCheckDataRead and DBGFBpCheckDataWrite.
278	*/
279	template<bool const a_fRead>
280	DECL_FORCE_INLINE(uint32_t) dbgfBpCheckData(PVMCC pVM, PVMCPUCC pVCpu, RTGCPTR GCPtrAccess, uint32_t cbAccess, bool fSysAccess)
281	{
282	AssertCompile((X86_DR7_RW_RW & 1) && (X86_DR7_RW_WO & 1));
283	CPUM_ASSERT_NOT_EXTRN(pVCpu, CPUMCTX_EXTRN_DR7);
284
285	uint32_t fRet = 0;
286	RTGCPTR const GCPtrAccessPfn = GCPtrAccess >> GUEST_PAGE_SHIFT;
287	Assert(((GCPtrAccess + cbAccess - 1) >> GUEST_PAGE_SHIFT) == GCPtrAccessPfn); /* No page crossing expected here! */
288
289	/*
290	* Check hyper breakpoints first as the VMM debugger has priority over
291	* the guest.
292	*/
293	if (pVM->dbgf.s.cEnabledHwBreakpoints > 0)
294	for (unsigned iBp = 0; iBp < RT_ELEMENTS(pVM->dbgf.s.aHwBreakpoints); iBp++)
295	{
296	if ( (pVM->dbgf.s.aHwBreakpoints[iBp].GCPtr >> GUEST_PAGE_SHIFT) != GCPtrAccessPfn
297	\|\| ( a_fRead
298	? pVM->dbgf.s.aHwBreakpoints[iBp].fType != X86_DR7_RW_RW
299	: !(pVM->dbgf.s.aHwBreakpoints[iBp].fType & 1))
300	\|\| pVM->dbgf.s.aHwBreakpoints[iBp].cb != 0
301	\|\| !pVM->dbgf.s.aHwBreakpoints[iBp].fEnabled
302	\|\| pVM->dbgf.s.aHwBreakpoints[iBp].hBp == NIL_DBGFBP)
303	{ /likely/ }
304	else
305	{
306	/* The page is of interest. */
307	AssertCompile(!((CPUMCTX_DBG_HIT_DRX_MASK \| CPUMCTX_DBG_DBGF_MASK) & UINT32_C(1)));
308	fRet \|= UINT32_C(1);
309
310	/* If the access overlapping the breakpoint area, we have a hit. */
311	if ( GCPtrAccess < pVM->dbgf.s.aHwBreakpoints[iBp].GCPtr + pVM->dbgf.s.aHwBreakpoints[iBp].cb
312	&& GCPtrAccess + cbAccess > pVM->dbgf.s.aHwBreakpoints[iBp].GCPtr)
313	{
314	pVCpu->dbgf.s.hBpActive = pVM->dbgf.s.aHwBreakpoints[iBp].hBp; /* ? */
315	pVCpu->dbgf.s.fSingleSteppingRaw = false;
316	LogFlow(("DBGFBpCheckData%s: hit hw breakpoint %u when accessing %RGv LB %#x\n",
317	a_fRead ? "Read" : "Write", iBp, GCPtrAccess, cbAccess));
318	fRet \|= CPUMCTX_DBG_DBGF_BP;
319	}
320	}
321	}
322
323	/*
324	* Check the guest.
325	*/
326	uint32_t const fDr7 = (uint32_t)pVCpu->cpum.GstCtx.dr[7];
327	if ( (a_fRead ? X86_DR7_ANY_RW_ENABLED(fDr7) : X86_DR7_ANY_W_ENABLED(fDr7))
328	&& !pVCpu->cpum.GstCtx.eflags.Bits.u1RF)
329	{
330	/* This is a bit suboptimal... Need a NORET variant. */
331	int rcIgn = VINF_SUCCESS;
332	CPUM_IMPORT_EXTRN_RCSTRICT(pVCpu, CPUMCTX_EXTRN_DR0_DR3, rcIgn);
333	RT_NOREF(rcIgn);
334
335	/** @todo Not sure what exactly intel and amd CPUs does here wrt disabled
336	* breakpoint configurations. We need a testcase for this. Following
337	* the guidelines of the execution breakpoints for now and making
338	* intel CPUs set status flags regardless of enabled or not. */
339	uint32_t fMatched = 0;
340	uint32_t fEnabled = 0;
341	for (uint32_t iBp = 0, fBpMask = CPUMCTX_DBG_HIT_DR0, fDr7Cfg = fDr7 >> 16, fDr7En = fDr7;
342	iBp < 4;
343	iBp++, fBpMask <<= 1, fDr7Cfg >>= 4, fDr7En >>= 2)
344	if ( (a_fRead ? (fDr7Cfg & 3) == X86_DR7_RW_RW : (fDr7Cfg & 1) != 0)
345	&& (pVCpu->cpum.GstCtx.dr[iBp] >> GUEST_PAGE_SHIFT) == GCPtrAccessPfn)
346	{
347	if (fDr7En & 3)
348	{
349	fEnabled \|= fBpMask;
350	fRet \|= UINT32_C(1);
351	}
352	static uint8_t const s_acbBp[] = { 1, 2, 8, 4 };
353	uint8_t const cbBp = s_acbBp[(fDr7Cfg >> 2) & 3];
354	if ( GCPtrAccess < pVCpu->cpum.GstCtx.dr[iBp] + cbBp
355	&& GCPtrAccess + cbAccess > pVCpu->cpum.GstCtx.dr[iBp])
356	fMatched \|= fBpMask;
357	}
358	if (!(fEnabled & fMatched))
359	{ /likely/ }
360	else
361	{
362	if (pVM->cpum.ro.GuestFeatures.enmCpuVendor != CPUMCPUVENDOR_INTEL)
363	fRet \|= fMatched & fEnabled;
364	else if (!fSysAccess)
365	fRet \|= fMatched;
366	else
367	fRet \|= CPUMCTX_DBG_HIT_DRX_SILENT; /* see bs3-cpu-weird-1 for special intel behviour */
368	LogFlow(("DBGFBpCheckData%s: hit hw breakpoints %#x (fRet=%#x) when accessing %RGv LB %#x\n",
369	a_fRead ? "Read" : "Write", fMatched, fRet, GCPtrAccess, cbAccess));
370	}
371	}
372
373	return fRet;
374	}
375
376
377	/**
378	* Checks read data access for guest or hypervisor hardware breakpoints.
379	*
380	* @returns Anything in CPUMCTX_DBG_HIT_DRX_MASK and CPUMCTX_DBG_DBGF_MASK if
381	* there is a hit, zero or one if no hit. Bit 0 is set if the page
382	* being accessed has a data breakpoint associated with it and needs
383	* special handling.
384	*
385	* @param pVM The cross context VM structure.
386	* @param pVCpu The cross context virtual CPU structure of the calling EMT.
387	* @param GCPtrAccess The address being accessed.
388	* @param cbAccess The size of the access. Must not cross a page
389	* boundrary.
390	* @param fSysAccess Set if a system access, like GDT, LDT or IDT.
391	*/
392	VMM_INT_DECL(uint32_t) DBGFBpCheckDataRead(PVMCC pVM, PVMCPUCC pVCpu, RTGCPTR GCPtrAccess, uint32_t cbAccess, bool fSysAccess)
393	{
394	return dbgfBpCheckData<true /a_fRead/>(pVM, pVCpu, GCPtrAccess, cbAccess, fSysAccess);
395	}
396
397
398	/**
399	* Checks read data access for guest or hypervisor hardware breakpoints.
400	*
401	* @returns Anything in CPUMCTX_DBG_DBGF_MASK if there is a hit, zero or one if
402	* no hit. Bit 0 is set if the page being accessed has a data
403	* breakpoint associated with it and needs special handling.
404	*
405	* @param pVM The cross context VM structure.
406	* @param pVCpu The cross context virtual CPU structure of the calling EMT.
407	* @param GCPtrAccess The address being accessed.
408	* @param cbAccess The size of the access. Must not cross a page
409	* boundrary.
410	* @param fSysAccess Set if a system access, like GDT, LDT or IDT.
411	*/
412	VMM_INT_DECL(uint32_t) DBGFBpCheckDataWrite(PVMCC pVM, PVMCPUCC pVCpu, RTGCPTR GCPtrAccess, uint32_t cbAccess, bool fSysAccess)
413	{
414	return dbgfBpCheckData<false /a_fRead/>(pVM, pVCpu, GCPtrAccess, cbAccess, fSysAccess);
415	}
416
417
418	/**
419	* Checks I/O access for guest or hypervisor hardware breakpoints.
420	*
421	* @returns Strict VBox status code
422	* @retval VINF_SUCCESS no breakpoint.
423	* @retval VINF_EM_DBG_BREAKPOINT hypervisor breakpoint triggered.
424	* @retval VINF_EM_RAW_GUEST_TRAP guest breakpoint triggered, DR6 and DR7 have
425	* been updated appropriately.
426	*
427	* @param pVM The cross context VM structure.
428	* @param pVCpu The cross context virtual CPU structure of the calling EMT.
429	* @param pCtx The CPU context for the calling EMT.
430	* @param uIoPort The I/O port being accessed.
431	* @param cbValue The size/width of the access, in bytes.
432	*/
433	VMM_INT_DECL(VBOXSTRICTRC) DBGFBpCheckIo(PVM pVM, PVMCPU pVCpu, PCPUMCTX pCtx, RTIOPORT uIoPort, uint8_t cbValue)
434	{
435	uint32_t const uIoPortFirst = uIoPort;
436	uint32_t const uIoPortLast = uIoPortFirst + cbValue - 1;
437
438	/*
439	* Check hyper breakpoints first as the VMM debugger has priority over
440	* the guest.
441	*/
442	if (pVM->dbgf.s.cEnabledHwIoBreakpoints > 0)
443	{
444	for (unsigned iBp = 0; iBp < RT_ELEMENTS(pVM->dbgf.s.aHwBreakpoints); iBp++)
445	{
446	if ( pVM->dbgf.s.aHwBreakpoints[iBp].fType == X86_DR7_RW_IO
447	&& pVM->dbgf.s.aHwBreakpoints[iBp].fEnabled
448	&& pVM->dbgf.s.aHwBreakpoints[iBp].hBp != NIL_DBGFBP)
449	{
450	uint8_t cbReg = pVM->dbgf.s.aHwBreakpoints[iBp].cb; Assert(RT_IS_POWER_OF_TWO(cbReg));
451	uint64_t uDrXFirst = pVM->dbgf.s.aHwBreakpoints[iBp].GCPtr & ~(uint64_t)(cbReg - 1);
452	uint64_t uDrXLast = uDrXFirst + cbReg - 1;
453	if (uDrXFirst <= uIoPortLast && uDrXLast >= uIoPortFirst)
454	{
455	/* (See also DBGFRZTrap01Handler.) */
456	pVCpu->dbgf.s.hBpActive = pVM->dbgf.s.aHwBreakpoints[iBp].hBp;
457	pVCpu->dbgf.s.fSingleSteppingRaw = false;
458
459	LogFlow(("DBGFBpCheckIo: hit hw breakpoint %d at %04x:%RGv (iop %#x)\n",
460	iBp, pCtx->cs.Sel, pCtx->rip, uIoPort));
461	return VINF_EM_DBG_BREAKPOINT;
462	}
463	}
464	}
465	}
466
467	/*
468	* Check the guest.
469	*/
470	uint32_t const uDr7 = pCtx->dr[7];
471	if ( (uDr7 & X86_DR7_ENABLED_MASK)
472	&& X86_DR7_ANY_RW_IO(uDr7)
473	&& (pCtx->cr4 & X86_CR4_DE) )
474	{
475	for (unsigned iBp = 0; iBp < 4; iBp++)
476	{
477	if ( (uDr7 & X86_DR7_L_G(iBp))
478	&& X86_DR7_GET_RW(uDr7, iBp) == X86_DR7_RW_IO)
479	{
480	/* ASSUME the breakpoint and the I/O width qualifier uses the same encoding (1 2 x 4). */
481	static uint8_t const s_abInvAlign[4] = { 0, 1, 7, 3 };
482	uint8_t cbInvAlign = s_abInvAlign[X86_DR7_GET_LEN(uDr7, iBp)];
483	uint64_t uDrXFirst = pCtx->dr[iBp] & ~(uint64_t)cbInvAlign;
484	uint64_t uDrXLast = uDrXFirst + cbInvAlign;
485
486	if (uDrXFirst <= uIoPortLast && uDrXLast >= uIoPortFirst)
487	{
488	/*
489	* Update DR6 and DR7.
490	*
491	* See "AMD64 Architecture Programmer's Manual Volume 2",
492	* chapter 13.1.1.3 for details on DR6 bits. The basics is
493	* that the B0..B3 bits are always cleared while the others
494	* must be cleared by software.
495	*
496	* The following sub chapters says the GD bit is always
497	* cleared when generating a #DB so the handler can safely
498	* access the debug registers.
499	*/
500	pCtx->dr[6] &= ~X86_DR6_B_MASK;
501	pCtx->dr[6] \|= X86_DR6_B(iBp);
502	pCtx->dr[7] &= ~X86_DR7_GD;
503	LogFlow(("DBGFBpCheckIo: hit hw breakpoint %d at %04x:%RGv (iop %#x)\n",
504	iBp, pCtx->cs.Sel, pCtx->rip, uIoPort));
505	return VINF_EM_RAW_GUEST_TRAP;
506	}
507	}
508	}
509	}
510	return VINF_SUCCESS;
511	}
512
513
514	/**
515	* Checks I/O access for guest or hypervisor hardware breakpoints.
516	*
517	* Caller must make sure DR0-3 and DR7 are present in the CPU context before
518	* calling this function.
519	*
520	* @returns CPUMCTX_DBG_DBGF_BP, CPUMCTX_DBG_HIT_DRX_MASK, or 0 (no match).
521	*
522	* @param pVM The cross context VM structure.
523	* @param pVCpu The cross context virtual CPU structure of the calling EMT.
524	* @param uIoPort The I/O port being accessed.
525	* @param cbValue The size/width of the access, in bytes.
526	*/
527	VMM_INT_DECL(uint32_t) DBGFBpCheckIo2(PVMCC pVM, PVMCPUCC pVCpu, RTIOPORT uIoPort, uint8_t cbValue)
528	{
529	uint32_t const uIoPortFirst = uIoPort;
530	uint32_t const uIoPortLast = uIoPortFirst + cbValue - 1;
531
532	/*
533	* Check hyper breakpoints first as the VMM debugger has priority over
534	* the guest.
535	*/
536	if (pVM->dbgf.s.cEnabledHwIoBreakpoints > 0)
537	for (unsigned iBp = 0; iBp < RT_ELEMENTS(pVM->dbgf.s.aHwBreakpoints); iBp++)
538	{
539	if ( pVM->dbgf.s.aHwBreakpoints[iBp].fType == X86_DR7_RW_IO
540	&& pVM->dbgf.s.aHwBreakpoints[iBp].fEnabled
541	&& pVM->dbgf.s.aHwBreakpoints[iBp].hBp != NIL_DBGFBP)
542	{
543	uint8_t cbReg = pVM->dbgf.s.aHwBreakpoints[iBp].cb; Assert(RT_IS_POWER_OF_TWO(cbReg));
544	uint64_t uDrXFirst = pVM->dbgf.s.aHwBreakpoints[iBp].GCPtr & ~(uint64_t)(cbReg - 1);
545	uint64_t uDrXLast = uDrXFirst + cbReg - 1;
546	if (uDrXFirst <= uIoPortLast && uDrXLast >= uIoPortFirst)
547	{
548	/* (See also DBGFRZTrap01Handler.) */
549	pVCpu->dbgf.s.hBpActive = pVM->dbgf.s.aHwBreakpoints[iBp].hBp;
550	pVCpu->dbgf.s.fSingleSteppingRaw = false;
551
552	LogFlow(("DBGFBpCheckIo2: hit hw breakpoint %d at %04x:%RGv (iop %#x L %u)\n",
553	iBp, pVCpu->cpum.GstCtx.cs.Sel, pVCpu->cpum.GstCtx.rip, uIoPort, cbValue));
554	return CPUMCTX_DBG_DBGF_BP;
555	}
556	}
557	}
558
559	/*
560	* Check the guest.
561	*/
562	uint32_t const fDr7 = pVCpu->cpum.GstCtx.dr[7];
563	if ( (fDr7 & X86_DR7_ENABLED_MASK)
564	&& X86_DR7_ANY_RW_IO(fDr7)
565	&& (pVCpu->cpum.GstCtx.cr4 & X86_CR4_DE) )
566	{
567	uint32_t fEnabled = 0;
568	uint32_t fMatched = 0;
569	for (unsigned iBp = 0, uBpMask = 1; iBp < 4; iBp++, uBpMask <<= 1)
570	{
571	if (fDr7 & X86_DR7_L_G(iBp))
572	fEnabled \|= uBpMask;
573	if (X86_DR7_GET_RW(fDr7, iBp) == X86_DR7_RW_IO)
574	{
575	/* ASSUME the breakpoint and the I/O width qualifier uses the same encoding (1 2 x 4). */
576	static uint8_t const s_abInvAlign[4] = { 0, 1, 7, 3 };
577	uint8_t const cbInvAlign = s_abInvAlign[X86_DR7_GET_LEN(fDr7, iBp)];
578	uint64_t const uDrXFirst = pVCpu->cpum.GstCtx.dr[iBp] & ~(uint64_t)cbInvAlign;
579	uint64_t const uDrXLast = uDrXFirst + cbInvAlign;
580	if (uDrXFirst <= uIoPortLast && uDrXLast >= uIoPortFirst)
581	fMatched \|= uBpMask;
582	}
583	}
584	if (fEnabled & fMatched)
585	{
586	LogFlow(("DBGFBpCheckIo2: hit hw breakpoint %#x at %04x:%RGv (iop %#x L %u)\n",
587	fMatched, pVCpu->cpum.GstCtx.cs.Sel, pVCpu->cpum.GstCtx.rip, uIoPort, cbValue));
588	return fMatched << CPUMCTX_DBG_HIT_DRX_SHIFT;
589	}
590	}
591
592	return 0;
593	}
594
595	#endif /* !VBOX_VMM_TARGET_ARMV8 */
596
597	/**
598	* Returns the single stepping state for a virtual CPU.
599	*
600	* @returns stepping (true) or not (false).
601	*
602	* @param pVCpu The cross context virtual CPU structure.
603	*/
604	VMM_INT_DECL(bool) DBGFIsStepping(PVMCPU pVCpu)
605	{
606	return pVCpu->dbgf.s.fSingleSteppingRaw;
607	}
608
609
610	/**
611	* Checks if the specified generic event is enabled or not.
612	*
613	* @returns true / false.
614	* @param pVM The cross context VM structure.
615	* @param enmEvent The generic event being raised.
616	* @param uEventArg The argument of that event.
617	*/
618	DECLINLINE(bool) dbgfEventIsGenericWithArgEnabled(PVM pVM, DBGFEVENTTYPE enmEvent, uint64_t uEventArg)
619	{
620	if (DBGF_IS_EVENT_ENABLED(pVM, enmEvent))
621	{
622	switch (enmEvent)
623	{
624	case DBGFEVENT_INTERRUPT_HARDWARE:
625	AssertReturn(uEventArg < 256, false);
626	return ASMBitTest(pVM->dbgf.s.bmHardIntBreakpoints, (uint32_t)uEventArg);
627
628	case DBGFEVENT_INTERRUPT_SOFTWARE:
629	AssertReturn(uEventArg < 256, false);
630	return ASMBitTest(pVM->dbgf.s.bmSoftIntBreakpoints, (uint32_t)uEventArg);
631
632	default:
633	return true;
634
635	}
636	}
637	return false;
638	}
639
640
641	/**
642	* Raises a generic debug event if enabled and not being ignored.
643	*
644	* @returns Strict VBox status code.
645	* @retval VINF_EM_DBG_EVENT if the event was raised and the caller should
646	* return ASAP to the debugger (via EM). We set VMCPU_FF_DBGF so, it
647	* is okay not to pass this along in some situations.
648	* @retval VINF_SUCCESS if the event was disabled or ignored.
649	*
650	* @param pVM The cross context VM structure.
651	* @param pVCpu The cross context virtual CPU structure.
652	* @param enmEvent The generic event being raised.
653	* @param enmCtx The context in which this event is being raised.
654	* @param cArgs Number of arguments (0 - 6).
655	* @param ... Event arguments.
656	*
657	* @thread EMT(pVCpu)
658	*/
659	VMM_INT_DECL(VBOXSTRICTRC) DBGFEventGenericWithArgs(PVM pVM, PVMCPU pVCpu, DBGFEVENTTYPE enmEvent, DBGFEVENTCTX enmCtx,
660	unsigned cArgs, ...)
661	{
662	Assert(cArgs < RT_ELEMENTS(pVCpu->dbgf.s.aEvents[0].Event.u.Generic.auArgs));
663
664	/*
665	* Is it enabled.
666	*/
667	va_list va;
668	va_start(va, cArgs);
669	uint64_t uEventArg0 = cArgs ? va_arg(va, uint64_t) : 0;
670	if (dbgfEventIsGenericWithArgEnabled(pVM, enmEvent, uEventArg0))
671	{
672	/*
673	* Any events on the stack. Should the incoming event be ignored?
674	*/
675	#if defined(VBOX_VMM_TARGET_ARMV8)
676	uint64_t const rip = CPUMGetGuestFlatPC(pVCpu); /* rip is a misnomer but saves us #ifdef's later on. */
677	#else
678	uint64_t const rip = CPUMGetGuestRIP(pVCpu);
679	#endif
680	uint32_t i = pVCpu->dbgf.s.cEvents;
681	if (i > 0)
682	{
683	while (i-- > 0)
684	{
685	if ( pVCpu->dbgf.s.aEvents[i].Event.enmType == enmEvent
686	&& pVCpu->dbgf.s.aEvents[i].enmState == DBGFEVENTSTATE_IGNORE
687	&& pVCpu->dbgf.s.aEvents[i].rip == rip)
688	{
689	pVCpu->dbgf.s.aEvents[i].enmState = DBGFEVENTSTATE_RESTORABLE;
690	va_end(va);
691	return VINF_SUCCESS;
692	}
693	Assert(pVCpu->dbgf.s.aEvents[i].enmState != DBGFEVENTSTATE_CURRENT);
694	}
695
696	/*
697	* Trim the event stack.
698	*/
699	i = pVCpu->dbgf.s.cEvents;
700	while (i-- > 0)
701	{
702	if ( pVCpu->dbgf.s.aEvents[i].rip == rip
703	&& ( pVCpu->dbgf.s.aEvents[i].enmState == DBGFEVENTSTATE_RESTORABLE
704	\|\| pVCpu->dbgf.s.aEvents[i].enmState == DBGFEVENTSTATE_IGNORE) )
705	pVCpu->dbgf.s.aEvents[i].enmState = DBGFEVENTSTATE_IGNORE;
706	else
707	{
708	if (i + 1 != pVCpu->dbgf.s.cEvents)
709	memmove(&pVCpu->dbgf.s.aEvents[i], &pVCpu->dbgf.s.aEvents[i + 1],
710	(pVCpu->dbgf.s.cEvents - i) * sizeof(pVCpu->dbgf.s.aEvents));
711	pVCpu->dbgf.s.cEvents--;
712	}
713	}
714
715	i = pVCpu->dbgf.s.cEvents;
716	AssertStmt(i < RT_ELEMENTS(pVCpu->dbgf.s.aEvents), i = RT_ELEMENTS(pVCpu->dbgf.s.aEvents) - 1);
717	}
718
719	/*
720	* Push the event.
721	*/
722	pVCpu->dbgf.s.aEvents[i].enmState = DBGFEVENTSTATE_CURRENT;
723	pVCpu->dbgf.s.aEvents[i].rip = rip;
724	pVCpu->dbgf.s.aEvents[i].Event.enmType = enmEvent;
725	pVCpu->dbgf.s.aEvents[i].Event.enmCtx = enmCtx;
726	pVCpu->dbgf.s.aEvents[i].Event.u.Generic.cArgs = cArgs;
727	pVCpu->dbgf.s.aEvents[i].Event.u.Generic.auArgs[0] = uEventArg0;
728	if (cArgs > 1)
729	{
730	AssertStmt(cArgs < RT_ELEMENTS(pVCpu->dbgf.s.aEvents[i].Event.u.Generic.auArgs),
731	cArgs = RT_ELEMENTS(pVCpu->dbgf.s.aEvents[i].Event.u.Generic.auArgs));
732	for (unsigned iArg = 1; iArg < cArgs; iArg++)
733	pVCpu->dbgf.s.aEvents[i].Event.u.Generic.auArgs[iArg] = va_arg(va, uint64_t);
734	}
735	pVCpu->dbgf.s.cEvents = i + 1;
736
737	VMCPU_FF_SET(pVCpu, VMCPU_FF_DBGF);
738	va_end(va);
739	return VINF_EM_DBG_EVENT;
740	}
741
742	va_end(va);
743	return VINF_SUCCESS;
744	}
745

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

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