DBGFDisas.cpp@ 29698

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1	/* $Id: DBGFDisas.cpp 28800 2010-04-27 08:22:32Z vboxsync $ */
2	/** @file
3	* DBGF - Debugger Facility, Disassembler.
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	* Header Files *
20	*******************************************************************************/
21	#define LOG_GROUP LOG_GROUP_DBGF
22	#include <VBox/dbgf.h>
23	#include <VBox/selm.h>
24	#include <VBox/mm.h>
25	#include <VBox/pgm.h>
26	#include <VBox/cpum.h>
27	#include "DBGFInternal.h"
28	#include <VBox/dis.h>
29	#include <VBox/err.h>
30	#include <VBox/param.h>
31	#include <VBox/vm.h>
32
33	#include <VBox/log.h>
34	#include <iprt/assert.h>
35	#include <iprt/string.h>
36	#include <iprt/alloca.h>
37	#include <iprt/ctype.h>
38
39
40	/*******************************************************************************
41	* Structures and Typedefs *
42	*******************************************************************************/
43	/**
44	* Structure used when disassembling and instructions in DBGF.
45	* This is used so the reader function can get the stuff it needs.
46	*/
47	typedef struct
48	{
49	/** The core structure. */
50	DISCPUSTATE Cpu;
51	/** The VM handle. */
52	PVM pVM;
53	/** The VMCPU handle. */
54	PVMCPU pVCpu;
55	/** The address space for resolving symbol. */
56	RTDBGAS hAs;
57	/** Pointer to the first byte in the segemnt. */
58	RTGCUINTPTR GCPtrSegBase;
59	/** Pointer to the byte after the end of the segment. (might have wrapped!) */
60	RTGCUINTPTR GCPtrSegEnd;
61	/** The size of the segment minus 1. */
62	RTGCUINTPTR cbSegLimit;
63	/** The guest paging mode. */
64	PGMMODE enmMode;
65	/** Pointer to the current page - R3 Ptr. */
66	void const *pvPageR3;
67	/** Pointer to the current page - GC Ptr. */
68	RTGCPTR pvPageGC;
69	/** Pointer to the next instruction (relative to GCPtrSegBase). */
70	RTGCUINTPTR GCPtrNext;
71	/** The lock information that PGMPhysReleasePageMappingLock needs. */
72	PGMPAGEMAPLOCK PageMapLock;
73	/** Whether the PageMapLock is valid or not. */
74	bool fLocked;
75	/** 64 bits mode or not. */
76	bool f64Bits;
77	} DBGFDISASSTATE, *PDBGFDISASSTATE;
78
79
80	/*******************************************************************************
81	* Internal Functions *
82	*******************************************************************************/
83	static DECLCALLBACK(int) dbgfR3DisasInstrRead(RTUINTPTR pSrc, uint8_t pDest, uint32_t size, void pvUserdata);
84
85
86
87	/**
88	* Calls the dissassembler with the proper reader functions and such for disa
89	*
90	* @returns VBox status code.
91	* @param pVM VM handle
92	* @param pVCpu VMCPU handle
93	* @param pSelInfo The selector info.
94	* @param enmMode The guest paging mode.
95	* @param GCPtr The GC pointer (selector offset).
96	* @param pState The disas CPU state.
97	*/
98	static int dbgfR3DisasInstrFirst(PVM pVM, PVMCPU pVCpu, PDBGFSELINFO pSelInfo, PGMMODE enmMode, RTGCPTR GCPtr, PDBGFDISASSTATE pState)
99	{
100	pState->GCPtrSegBase = pSelInfo->GCPtrBase;
101	pState->GCPtrSegEnd = pSelInfo->cbLimit + 1 + (RTGCUINTPTR)pSelInfo->GCPtrBase;
102	pState->cbSegLimit = pSelInfo->cbLimit;
103	pState->enmMode = enmMode;
104	pState->pvPageGC = 0;
105	pState->pvPageR3 = NULL;
106	pState->hAs = pSelInfo->fFlags & DBGFSELINFO_FLAGS_HYPER /** @todo Deal more explicitly with RC in DBGFR3Disas. /
107	? DBGF_AS_RC_AND_GC_GLOBAL
108	: DBGF_AS_GLOBAL;
109	pState->pVM = pVM;
110	pState->pVCpu = pVCpu;
111	pState->fLocked = false;
112	pState->f64Bits = enmMode >= PGMMODE_AMD64 && pSelInfo->u.Raw.Gen.u1Long;
113	uint32_t cbInstr;
114	int rc = DISCoreOneEx(GCPtr,
115	pState->f64Bits
116	? CPUMODE_64BIT
117	: pSelInfo->u.Raw.Gen.u1DefBig
118	? CPUMODE_32BIT
119	: CPUMODE_16BIT,
120	dbgfR3DisasInstrRead,
121	&pState->Cpu,
122	&pState->Cpu,
123	&cbInstr);
124	if (RT_SUCCESS(rc))
125	{
126	pState->GCPtrNext = GCPtr + cbInstr;
127	return VINF_SUCCESS;
128	}
129
130	/* cleanup */
131	if (pState->fLocked)
132	{
133	PGMPhysReleasePageMappingLock(pVM, &pState->PageMapLock);
134	pState->fLocked = false;
135	}
136	return rc;
137	}
138
139
140	#if 0
141	/**
142	* Calls the dissassembler for disassembling the next instruction.
143	*
144	* @returns VBox status code.
145	* @param pState The disas CPU state.
146	*/
147	static int dbgfR3DisasInstrNext(PDBGFDISASSTATE pState)
148	{
149	uint32_t cbInstr;
150	int rc = DISInstr(&pState->Cpu, (void *)pState->GCPtrNext, 0, &cbInstr, NULL);
151	if (RT_SUCCESS(rc))
152	{
153	pState->GCPtrNext = GCPtr + cbInstr;
154	return VINF_SUCCESS;
155	}
156	return rc;
157	}
158	#endif
159
160
161	/**
162	* Done with the dissassembler state, free associated resources.
163	*
164	* @param pState The disas CPU state ++.
165	*/
166	static void dbgfR3DisasInstrDone(PDBGFDISASSTATE pState)
167	{
168	if (pState->fLocked)
169	{
170	PGMPhysReleasePageMappingLock(pState->pVM, &pState->PageMapLock);
171	pState->fLocked = false;
172	}
173	}
174
175
176	/**
177	* Instruction reader.
178	*
179	* @returns VBox status code. (Why this is a int32_t and not just an int is also beyond me.)
180	* @param PtrSrc Address to read from.
181	* In our case this is relative to the selector pointed to by the 2nd user argument of uDisCpu.
182	* @param pu8Dst Where to store the bytes.
183	* @param cbRead Number of bytes to read.
184	* @param uDisCpu Pointer to the disassembler cpu state. (Why this is a VBOXHUINTPTR is beyond me...)
185	* In this context it's always pointer to the Core of a DBGFDISASSTATE.
186	*/
187	static DECLCALLBACK(int) dbgfR3DisasInstrRead(RTUINTPTR PtrSrc, uint8_t pu8Dst, uint32_t cbRead, void pvDisCpu)
188	{
189	PDBGFDISASSTATE pState = (PDBGFDISASSTATE)pvDisCpu;
190	Assert(cbRead > 0);
191	for (;;)
192	{
193	RTGCUINTPTR GCPtr = PtrSrc + pState->GCPtrSegBase;
194
195	/* Need to update the page translation? */
196	if ( !pState->pvPageR3
197	\|\| (GCPtr >> PAGE_SHIFT) != (pState->pvPageGC >> PAGE_SHIFT))
198	{
199	int rc = VINF_SUCCESS;
200
201	/* translate the address */
202	pState->pvPageGC = GCPtr & PAGE_BASE_GC_MASK;
203	if (MMHyperIsInsideArea(pState->pVM, pState->pvPageGC))
204	{
205	pState->pvPageR3 = MMHyperRCToR3(pState->pVM, (RTRCPTR)pState->pvPageGC);
206	if (!pState->pvPageR3)
207	rc = VERR_INVALID_POINTER;
208	}
209	else
210	{
211	if (pState->fLocked)
212	PGMPhysReleasePageMappingLock(pState->pVM, &pState->PageMapLock);
213
214	if (pState->enmMode <= PGMMODE_PROTECTED)
215	rc = PGMPhysGCPhys2CCPtrReadOnly(pState->pVM, pState->pvPageGC, &pState->pvPageR3, &pState->PageMapLock);
216	else
217	rc = PGMPhysGCPtr2CCPtrReadOnly(pState->pVCpu, pState->pvPageGC, &pState->pvPageR3, &pState->PageMapLock);
218	pState->fLocked = RT_SUCCESS_NP(rc);
219	}
220	if (RT_FAILURE(rc))
221	{
222	pState->pvPageR3 = NULL;
223	return rc;
224	}
225	}
226
227	/* check the segemnt limit */
228	if (!pState->f64Bits && PtrSrc > pState->cbSegLimit)
229	return VERR_OUT_OF_SELECTOR_BOUNDS;
230
231	/* calc how much we can read */
232	uint32_t cb = PAGE_SIZE - (GCPtr & PAGE_OFFSET_MASK);
233	if (!pState->f64Bits)
234	{
235	RTGCUINTPTR cbSeg = pState->GCPtrSegEnd - GCPtr;
236	if (cb > cbSeg && cbSeg)
237	cb = cbSeg;
238	}
239	if (cb > cbRead)
240	cb = cbRead;
241
242	/* read and advance */
243	memcpy(pu8Dst, (char *)pState->pvPageR3 + (GCPtr & PAGE_OFFSET_MASK), cb);
244	cbRead -= cb;
245	if (!cbRead)
246	return VINF_SUCCESS;
247	pu8Dst += cb;
248	PtrSrc += cb;
249	}
250	}
251
252
253	/**
254	* @copydoc FNDISGETSYMBOL
255	*/
256	static DECLCALLBACK(int) dbgfR3DisasGetSymbol(PCDISCPUSTATE pCpu, uint32_t u32Sel, RTUINTPTR uAddress, char pszBuf, size_t cchBuf, RTINTPTR poff, void *pvUser)
257	{
258	PDBGFDISASSTATE pState = (PDBGFDISASSTATE)pCpu;
259	PCDBGFSELINFO pSelInfo = (PCDBGFSELINFO)pvUser;
260	DBGFADDRESS Addr;
261	RTDBGSYMBOL Sym;
262	RTGCINTPTR off;
263	int rc;
264
265	if ( DIS_FMT_SEL_IS_REG(u32Sel)
266	? DIS_FMT_SEL_GET_REG(u32Sel) == DIS_SELREG_CS
267	: pSelInfo->Sel == DIS_FMT_SEL_GET_VALUE(u32Sel))
268	{
269	rc = DBGFR3AddrFromSelInfoOff(pState->pVM, &Addr, pSelInfo, uAddress);
270	if (RT_SUCCESS(rc))
271	rc = DBGFR3AsSymbolByAddr(pState->pVM, pState->hAs, &Addr, &off, &Sym, NULL /phMod/);
272	}
273	else
274	rc = VERR_SYMBOL_NOT_FOUND; /** @todo implement this */
275	if (RT_SUCCESS(rc))
276	{
277	size_t cchName = strlen(Sym.szName);
278	if (cchName >= cchBuf)
279	cchName = cchBuf - 1;
280	memcpy(pszBuf, Sym.szName, cchName);
281	pszBuf[cchName] = '\0';
282
283	*poff = off;
284	}
285
286	return rc;
287	}
288
289
290	/**
291	* Disassembles the one instruction according to the specified flags and
292	* address, internal worker executing on the EMT of the specified virtual CPU.
293	*
294	* @returns VBox status code.
295	* @param pVM The VM handle.
296	* @param pVCpu The virtual CPU handle.
297	* @param Sel The code selector. This used to determin the 32/16 bit ness and
298	* calculation of the actual instruction address.
299	* @param pGCPtr Pointer to the variable holding the code address
300	* relative to the base of Sel.
301	* @param fFlags Flags controlling where to start and how to format.
302	* A combination of the DBGF_DISAS_FLAGS_* \#defines.
303	* @param pszOutput Output buffer.
304	* @param cchOutput Size of the output buffer.
305	* @param pcbInstr Where to return the size of the instruction.
306	*/
307	static DECLCALLBACK(int)
308	dbgfR3DisasInstrExOnVCpu(PVM pVM, PVMCPU pVCpu, RTSEL Sel, PRTGCPTR pGCPtr, unsigned fFlags,
309	char pszOutput, uint32_t cchOutput, uint32_t pcbInstr)
310	{
311	VMCPU_ASSERT_EMT(pVCpu);
312	RTGCPTR GCPtr = *pGCPtr;
313
314	/*
315	* Get the Sel and GCPtr if fFlags requests that.
316	*/
317	PCCPUMCTXCORE pCtxCore = NULL;
318	CPUMSELREGHID *pHiddenSel = NULL;
319	int rc;
320	if (fFlags & (DBGF_DISAS_FLAGS_CURRENT_GUEST \| DBGF_DISAS_FLAGS_CURRENT_HYPER))
321	{
322	if (fFlags & DBGF_DISAS_FLAGS_CURRENT_GUEST)
323	pCtxCore = CPUMGetGuestCtxCore(pVCpu);
324	else
325	pCtxCore = CPUMGetHyperCtxCore(pVCpu);
326	Sel = pCtxCore->cs;
327	pHiddenSel = (CPUMSELREGHID *)&pCtxCore->csHid;
328	GCPtr = pCtxCore->rip;
329	}
330
331	/*
332	* Read the selector info - assume no stale selectors and nasty stuff like that.
333	* Since the selector flags in the CPUMCTX structures aren't up to date unless
334	* we recently visited REM, we'll not search for the selector there.
335	*/
336	DBGFSELINFO SelInfo;
337	const PGMMODE enmMode = PGMGetGuestMode(pVCpu);
338	bool fRealModeAddress = false;
339
340	if ( pHiddenSel
341	&& CPUMAreHiddenSelRegsValid(pVM))
342	{
343	SelInfo.Sel = Sel;
344	SelInfo.SelGate = 0;
345	SelInfo.GCPtrBase = pHiddenSel->u64Base;
346	SelInfo.cbLimit = pHiddenSel->u32Limit;
347	SelInfo.fFlags = PGMMODE_IS_LONG_MODE(enmMode)
348	? DBGFSELINFO_FLAGS_LONG_MODE
349	: enmMode != PGMMODE_REAL && (!pCtxCore \|\| !pCtxCore->eflags.Bits.u1VM)
350	? DBGFSELINFO_FLAGS_PROT_MODE
351	: DBGFSELINFO_FLAGS_REAL_MODE;
352
353	SelInfo.u.Raw.au32[0] = 0;
354	SelInfo.u.Raw.au32[1] = 0;
355	SelInfo.u.Raw.Gen.u16LimitLow = 0xffff;
356	SelInfo.u.Raw.Gen.u4LimitHigh = 0xf;
357	SelInfo.u.Raw.Gen.u1Present = pHiddenSel->Attr.n.u1Present;
358	SelInfo.u.Raw.Gen.u1Granularity = pHiddenSel->Attr.n.u1Granularity;;
359	SelInfo.u.Raw.Gen.u1DefBig = pHiddenSel->Attr.n.u1DefBig;
360	SelInfo.u.Raw.Gen.u1Long = pHiddenSel->Attr.n.u1Long;
361	SelInfo.u.Raw.Gen.u1DescType = pHiddenSel->Attr.n.u1DescType;
362	SelInfo.u.Raw.Gen.u4Type = pHiddenSel->Attr.n.u4Type;
363	fRealModeAddress = !!(SelInfo.fFlags & DBGFSELINFO_FLAGS_REAL_MODE);
364	}
365	else if (Sel == DBGF_SEL_FLAT)
366	{
367	SelInfo.Sel = Sel;
368	SelInfo.SelGate = 0;
369	SelInfo.GCPtrBase = 0;
370	SelInfo.cbLimit = ~0;
371	SelInfo.fFlags = PGMMODE_IS_LONG_MODE(enmMode)
372	? DBGFSELINFO_FLAGS_LONG_MODE
373	: enmMode != PGMMODE_REAL
374	? DBGFSELINFO_FLAGS_PROT_MODE
375	: DBGFSELINFO_FLAGS_REAL_MODE;
376	SelInfo.u.Raw.au32[0] = 0;
377	SelInfo.u.Raw.au32[1] = 0;
378	SelInfo.u.Raw.Gen.u16LimitLow = 0xffff;
379	SelInfo.u.Raw.Gen.u4LimitHigh = 0xf;
380
381	if (CPUMAreHiddenSelRegsValid(pVM))
382	{ /* Assume the current CS defines the execution mode. */
383	pCtxCore = CPUMGetGuestCtxCore(pVCpu);
384	pHiddenSel = (CPUMSELREGHID *)&pCtxCore->csHid;
385
386	SelInfo.u.Raw.Gen.u1Present = pHiddenSel->Attr.n.u1Present;
387	SelInfo.u.Raw.Gen.u1Granularity = pHiddenSel->Attr.n.u1Granularity;;
388	SelInfo.u.Raw.Gen.u1DefBig = pHiddenSel->Attr.n.u1DefBig;
389	SelInfo.u.Raw.Gen.u1Long = pHiddenSel->Attr.n.u1Long;
390	SelInfo.u.Raw.Gen.u1DescType = pHiddenSel->Attr.n.u1DescType;
391	SelInfo.u.Raw.Gen.u4Type = pHiddenSel->Attr.n.u4Type;
392	}
393	else
394	{
395	SelInfo.u.Raw.Gen.u1Present = 1;
396	SelInfo.u.Raw.Gen.u1Granularity = 1;
397	SelInfo.u.Raw.Gen.u1DefBig = 1;
398	SelInfo.u.Raw.Gen.u1DescType = 1;
399	SelInfo.u.Raw.Gen.u4Type = X86_SEL_TYPE_EO;
400	}
401	}
402	else if ( !(fFlags & DBGF_DISAS_FLAGS_CURRENT_HYPER)
403	&& ( (pCtxCore && pCtxCore->eflags.Bits.u1VM)
404	\|\| enmMode == PGMMODE_REAL) )
405	{ /* V86 mode or real mode - real mode addressing */
406	SelInfo.Sel = Sel;
407	SelInfo.SelGate = 0;
408	SelInfo.GCPtrBase = Sel * 16;
409	SelInfo.cbLimit = ~0;
410	SelInfo.fFlags = DBGFSELINFO_FLAGS_REAL_MODE;
411	SelInfo.u.Raw.au32[0] = 0;
412	SelInfo.u.Raw.au32[1] = 0;
413	SelInfo.u.Raw.Gen.u16LimitLow = 0xffff;
414	SelInfo.u.Raw.Gen.u4LimitHigh = 0xf;
415	SelInfo.u.Raw.Gen.u1Present = 1;
416	SelInfo.u.Raw.Gen.u1Granularity = 1;
417	SelInfo.u.Raw.Gen.u1DefBig = 0; /* 16 bits */
418	SelInfo.u.Raw.Gen.u1DescType = 1;
419	SelInfo.u.Raw.Gen.u4Type = X86_SEL_TYPE_EO;
420	fRealModeAddress = true;
421	}
422	else
423	{
424	rc = SELMR3GetSelectorInfo(pVM, pVCpu, Sel, &SelInfo);
425	if (RT_FAILURE(rc))
426	{
427	RTStrPrintf(pszOutput, cchOutput, "Sel=%04x -> %Rrc\n", Sel, rc);
428	return rc;
429	}
430	}
431
432	/*
433	* Disassemble it.
434	*/
435	DBGFDISASSTATE State;
436	rc = dbgfR3DisasInstrFirst(pVM, pVCpu, &SelInfo, enmMode, GCPtr, &State);
437	if (RT_FAILURE(rc))
438	{
439	RTStrPrintf(pszOutput, cchOutput, "Disas -> %Rrc\n", rc);
440	return rc;
441	}
442
443	/*
444	* Format it.
445	*/
446	char szBuf[512];
447	DISFormatYasmEx(&State.Cpu, szBuf, sizeof(szBuf),
448	DIS_FMT_FLAGS_RELATIVE_BRANCH,
449	fFlags & DBGF_DISAS_FLAGS_NO_SYMBOLS ? NULL : dbgfR3DisasGetSymbol,
450	&SelInfo);
451
452	/*
453	* Print it to the user specified buffer.
454	*/
455	if (fFlags & DBGF_DISAS_FLAGS_NO_BYTES)
456	{
457	if (fFlags & DBGF_DISAS_FLAGS_NO_ADDRESS)
458	RTStrPrintf(pszOutput, cchOutput, "%s", szBuf);
459	else if (fRealModeAddress)
460	RTStrPrintf(pszOutput, cchOutput, "%04x:%04x %s", Sel, (unsigned)GCPtr, szBuf);
461	else if (Sel == DBGF_SEL_FLAT)
462	{
463	if (enmMode >= PGMMODE_AMD64)
464	RTStrPrintf(pszOutput, cchOutput, "%RGv %s", GCPtr, szBuf);
465	else
466	RTStrPrintf(pszOutput, cchOutput, "%08RX32 %s", (uint32_t)GCPtr, szBuf);
467	}
468	else
469	{
470	if (enmMode >= PGMMODE_AMD64)
471	RTStrPrintf(pszOutput, cchOutput, "%04x:%RGv %s", Sel, GCPtr, szBuf);
472	else
473	RTStrPrintf(pszOutput, cchOutput, "%04x:%08RX32 %s", Sel, (uint32_t)GCPtr, szBuf);
474	}
475	}
476	else
477	{
478	uint32_t cbBits = State.Cpu.opsize;
479	uint8_t pau8Bits = (uint8_t )alloca(cbBits);
480	rc = dbgfR3DisasInstrRead(GCPtr, pau8Bits, cbBits, &State);
481	AssertRC(rc);
482	if (fFlags & DBGF_DISAS_FLAGS_NO_ADDRESS)
483	RTStrPrintf(pszOutput, cchOutput, "%.Rhxs%s %s",
484	cbBits, pau8Bits, cbBits < 8 ? (8 - cbBits) * 3 : 0, "",
485	szBuf);
486	else if (fRealModeAddress)
487	RTStrPrintf(pszOutput, cchOutput, "%04x:%04x %.Rhxs%s %s",
488	Sel, (unsigned)GCPtr,
489	cbBits, pau8Bits, cbBits < 8 ? (8 - cbBits) * 3 : 0, "",
490	szBuf);
491	else if (Sel == DBGF_SEL_FLAT)
492	{
493	if (enmMode >= PGMMODE_AMD64)
494	RTStrPrintf(pszOutput, cchOutput, "%RGv %.Rhxs%s %s",
495	GCPtr,
496	cbBits, pau8Bits, cbBits < 8 ? (8 - cbBits) * 3 : 0, "",
497	szBuf);
498	else
499	RTStrPrintf(pszOutput, cchOutput, "%08RX32 %.Rhxs%s %s",
500	(uint32_t)GCPtr,
501	cbBits, pau8Bits, cbBits < 8 ? (8 - cbBits) * 3 : 0, "",
502	szBuf);
503	}
504	else
505	{
506	if (enmMode >= PGMMODE_AMD64)
507	RTStrPrintf(pszOutput, cchOutput, "%04x:%RGv %.Rhxs%s %s",
508	Sel, GCPtr,
509	cbBits, pau8Bits, cbBits < 8 ? (8 - cbBits) * 3 : 0, "",
510	szBuf);
511	else
512	RTStrPrintf(pszOutput, cchOutput, "%04x:%08RX32 %.Rhxs%s %s",
513	Sel, (uint32_t)GCPtr,
514	cbBits, pau8Bits, cbBits < 8 ? (8 - cbBits) * 3 : 0, "",
515	szBuf);
516	}
517	}
518
519	if (pcbInstr)
520	*pcbInstr = State.Cpu.opsize;
521
522	dbgfR3DisasInstrDone(&State);
523	return VINF_SUCCESS;
524	}
525
526
527	/**
528	* Disassembles the one instruction according to the specified flags and address.
529	*
530	* @returns VBox status code.
531	* @param pVM VM handle.
532	* @param idCpu The ID of virtual CPU.
533	* @param Sel The code selector. This used to determin the 32/16 bit ness and
534	* calculation of the actual instruction address.
535	* @param GCPtr The code address relative to the base of Sel.
536	* @param fFlags Flags controlling where to start and how to format.
537	* A combination of the DBGF_DISAS_FLAGS_* \#defines.
538	* @param pszOutput Output buffer.
539	* @param cchOutput Size of the output buffer.
540	* @param pcbInstr Where to return the size of the instruction.
541	*
542	* @remarks May have to switch to the EMT of the virtual CPU in order to do
543	* address conversion.
544	*/
545	VMMR3DECL(int) DBGFR3DisasInstrEx(PVM pVM, VMCPUID idCpu, RTSEL Sel, RTGCPTR GCPtr, unsigned fFlags,
546	char pszOutput, uint32_t cchOutput, uint32_t pcbInstr)
547	{
548	VM_ASSERT_VALID_EXT_RETURN(pVM, VERR_INVALID_VM_HANDLE);
549	AssertReturn(idCpu < pVM->cCpus, VERR_INVALID_CPU_ID);
550
551	/*
552	* Optimize the common case where we're called on the EMT of idCpu since
553	* we're using this all the time when logging.
554	*/
555	int rc;
556	PVMCPU pVCpu = VMMGetCpu(pVM);
557	if ( pVCpu
558	&& pVCpu->idCpu == idCpu)
559	rc = dbgfR3DisasInstrExOnVCpu(pVM, pVCpu, Sel, &GCPtr, fFlags, pszOutput, cchOutput, pcbInstr);
560	else
561	rc = VMR3ReqCallWait(pVM, idCpu, (PFNRT)dbgfR3DisasInstrExOnVCpu, 8,
562	pVM, VMMGetCpuById(pVM, idCpu), Sel, &GCPtr, fFlags, pszOutput, cchOutput, pcbInstr);
563	return rc;
564	}
565
566
567	/**
568	* Disassembles the current guest context instruction.
569	* All registers and data will be displayed. Addresses will be attempted resolved to symbols.
570	*
571	* @returns VBox status code.
572	* @param pVCpu VMCPU handle.
573	* @param pszOutput Output buffer.
574	* @param cchOutput Size of the output buffer.
575	*/
576	VMMR3DECL(int) DBGFR3DisasInstrCurrent(PVMCPU pVCpu, char *pszOutput, uint32_t cchOutput)
577	{
578	*pszOutput = '\0';
579	AssertReturn(pVCpu, VERR_INVALID_CONTEXT);
580	return DBGFR3DisasInstrEx(pVCpu->pVMR3, pVCpu->idCpu, 0, 0, DBGF_DISAS_FLAGS_CURRENT_GUEST,
581	pszOutput, cchOutput, NULL);
582	}
583
584
585	/**
586	* Disassembles the current guest context instruction and writes it to the log.
587	* All registers and data will be displayed. Addresses will be attempted resolved to symbols.
588	*
589	* @returns VBox status code.
590	* @param pVCpu VMCPU handle.
591	* @param pszPrefix Short prefix string to the dissassembly string. (optional)
592	*/
593	VMMR3DECL(int) DBGFR3DisasInstrCurrentLogInternal(PVMCPU pVCpu, const char *pszPrefix)
594	{
595	char szBuf[256];
596	szBuf[0] = '\0';
597	int rc = DBGFR3DisasInstrCurrent(pVCpu, &szBuf[0], sizeof(szBuf));
598	if (RT_FAILURE(rc))
599	RTStrPrintf(szBuf, sizeof(szBuf), "DBGFR3DisasInstrCurrentLog failed with rc=%Rrc\n", rc);
600	if (pszPrefix && *pszPrefix)
601	RTLogPrintf("%s-CPU%d: %s\n", pszPrefix, pVCpu->idCpu, szBuf);
602	else
603	RTLogPrintf("%s\n", szBuf);
604	return rc;
605	}
606
607
608
609	/**
610	* Disassembles the specified guest context instruction and writes it to the log.
611	* Addresses will be attempted resolved to symbols.
612	*
613	* @returns VBox status code.
614	* @param pVM VM handle.
615	* @param pVCpu The virtual CPU handle, defaults to CPU 0 if NULL.
616	* @param Sel The code selector. This used to determin the 32/16 bit-ness and
617	* calculation of the actual instruction address.
618	* @param GCPtr The code address relative to the base of Sel.
619	*/
620	VMMR3DECL(int) DBGFR3DisasInstrLogInternal(PVMCPU pVCpu, RTSEL Sel, RTGCPTR GCPtr)
621	{
622	char szBuf[256];
623	szBuf[0] = '\0';
624	int rc = DBGFR3DisasInstrEx(pVCpu->pVMR3, pVCpu->idCpu, Sel, GCPtr, 0, &szBuf[0], sizeof(szBuf), NULL);
625	if (RT_FAILURE(rc))
626	RTStrPrintf(szBuf, sizeof(szBuf), "DBGFR3DisasInstrLog(, %RTsel, %RGv) failed with rc=%Rrc\n", Sel, GCPtr, rc);
627	RTLogPrintf("%s\n", szBuf);
628	return rc;
629	}
630

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source: vbox/trunk/src/VBox/VMM/DBGFDisas.cpp@ 29698

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