IOMGC.cpp@ 1986

Last change on this file since 1986 was 1936, checked in by vboxsync, 18 years ago
Use new disassembler functions. Remove obsolete tables.
Property svn:eol-style set to `native` Property svn:keywords set to `Id`
File size: 21.1 KB

Line
1	/* $Id: IOMGC.cpp 1936 2007-04-04 15:06:13Z vboxsync $ */
2	/** @file
3	* IOM - Input / Output Monitor - Guest Context.
4	*/
5
6	/*
7	* Copyright (C) 2006 InnoTek Systemberatung GmbH
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 as published by the Free Software Foundation,
13	* in version 2 as it comes in the "COPYING" file of the VirtualBox OSE
14	* distribution. VirtualBox OSE is distributed in the hope that it will
15	* be useful, but WITHOUT ANY WARRANTY of any kind.
16	*
17	* If you received this file as part of a commercial VirtualBox
18	* distribution, then only the terms of your commercial VirtualBox
19	* license agreement apply instead of the previous paragraph.
20	*/
21
22
23	/*******************************************************************************
24	* Header Files *
25	*******************************************************************************/
26	#define LOG_GROUP LOG_GROUP_IOM
27	#include <VBox/iom.h>
28	#include <VBox/cpum.h>
29	#include <VBox/pgm.h>
30	#include <VBox/selm.h>
31	#include <VBox/mm.h>
32	#include <VBox/em.h>
33	#include <VBox/pgm.h>
34	#include <VBox/trpm.h>
35	#include "IOMInternal.h"
36	#include <VBox/vm.h>
37
38	#include <VBox/dis.h>
39	#include <VBox/disopcode.h>
40	#include <VBox/param.h>
41	#include <VBox/err.h>
42	#include <iprt/assert.h>
43	#include <VBox/log.h>
44	#include <iprt/asm.h>
45	#include <iprt/string.h>
46
47
48	/** @def IOMGC_MOVS_SUPPORT
49	* Define IOMGC_MOVS_SUPPORT for movsb/w/d support in GC.
50	*/
51	#define IOMGC_MOVS_SUPPORT
52
53
54	/*******************************************************************************
55	* Internal Functions *
56	*******************************************************************************/
57	#if 0
58	static bool iomGCCalcParamEA(PDISCPUSTATE pCpu, POP_PARAMETER pParam, PCPUMCTXCORE pRegFrame, void **ppAddr);
59	#endif
60	static unsigned iomGCGetRegSize(PDISCPUSTATE pCpu, PCOP_PARAMETER pParam);
61	static bool iomGCGetRegImmData(PDISCPUSTATE pCpu, PCOP_PARAMETER pParam, PCPUMCTXCORE pRegFrame, uint32_t pu32Data, unsigned pcbSize);
62	static bool iomGCSaveDataToReg(PDISCPUSTATE pCpu, PCOP_PARAMETER pParam, PCPUMCTXCORE pRegFrame, uint32_t u32Data);
63
64
65	/*******************************************************************************
66	* Global Variables *
67	*******************************************************************************/
68
69	/**
70	* Array for fast recode of the operand size (1/2/4/8 bytes) to bit shift value.
71	*/
72	static const unsigned g_aSize2Shift[] =
73	{
74	~0, /* 0 - invalid */
75	0, /* 1 == 2^0 /
76	1, /* 2 == 2^1 /
77	~0, /* 3 - invalid */
78	2, /* 4 == 2^2 /
79	~0, /* 5 - invalid */
80	~0, /* 6 - invalid */
81	~0, /* 7 - invalid */
82	3 /* 8 == 2^3 /
83	};
84
85	/**
86	* Macro for fast recode of the operand size (1/2/4/8 bytes) to bit shift value.
87	*/
88	#define SIZE2SHIFT(cb) (g_aSize2Shift[cb])
89
90
91	#if 0
92	/**
93	* Calculates effective address (offset from current segment register) for
94	* instruction parameter, i.e. [eax + esi*4 + 1234h] -> virtual address.
95	*
96	* @returns true on success.
97	* @param pCpu Pointer to current disassembler context.
98	* @param pParam Pointer to parameter of instruction to calc EA.
99	* @param pRegFrame Pointer to CPUMCTXCORE guest structure.
100	* @param ppAddr Where to store result address.
101	*/
102	static bool iomGCCalcParamEA(PDISCPUSTATE pCpu, POP_PARAMETER pParam, PCPUMCTXCORE pRegFrame, void **ppAddr)
103	{
104	uint8_t *pAddr = 0;
105
106	if (pCpu->addrmode == CPUMODE_32BIT)
107	{
108	/* 32-bit addressing. */
109	if (pParam->flags & USE_BASE)
110	pAddr += ACCESS_REG32(pRegFrame, pParam->base.reg_gen32);
111	if (pParam->flags & USE_INDEX)
112	{
113	unsigned i = ACCESS_REG32(pRegFrame, pParam->index.reg_gen);
114	if (pParam->flags & USE_SCALE)
115	i *= pParam->scale;
116	pAddr += i;
117	}
118	if (pParam->flags & USE_DISPLACEMENT8)
119	pAddr += pParam->disp8;
120	else
121	if (pParam->flags & USE_DISPLACEMENT16)
122	pAddr += pParam->disp16;
123	else
124	if (pParam->flags & USE_DISPLACEMENT32)
125	pAddr += pParam->disp32;
126
127	if (pParam->flags & (USE_BASE \| USE_INDEX \| USE_DISPLACEMENT8 \| USE_DISPLACEMENT16 \| USE_DISPLACEMENT32))
128	{
129	/* EA present in parameter. */
130	*ppAddr = pAddr;
131	return true;
132	}
133	}
134	else
135	{
136	/* 16-bit addressing. */
137	if (pParam->flags & USE_BASE)
138	pAddr += ACCESS_REG16(pRegFrame, pParam->base.reg_gen16);
139	if (pParam->flags & USE_INDEX)
140	pAddr += ACCESS_REG16(pRegFrame, pParam->index.reg_gen);
141	if (pParam->flags & USE_DISPLACEMENT8)
142	pAddr += pParam->disp8;
143	else
144	if (pParam->flags & USE_DISPLACEMENT16)
145	pAddr += pParam->disp16;
146
147	if (pParam->flags & (USE_BASE \| USE_INDEX \| USE_DISPLACEMENT8 \| USE_DISPLACEMENT16))
148	{
149	/* EA present in parameter. */
150	*ppAddr = pAddr;
151	return true;
152	}
153	}
154
155	/* Error exit. */
156	return false;
157	}
158	#endif
159
160	/**
161	* Calculates the size of register parameter.
162	*
163	* @returns 1, 2, 4 on success.
164	* @returns 0 if non-register parameter.
165	* @param pCpu Pointer to current disassembler context.
166	* @param pParam Pointer to parameter of instruction to proccess.
167	*/
168	static unsigned iomGCGetRegSize(PDISCPUSTATE pCpu, PCOP_PARAMETER pParam)
169	{
170	if (pParam->flags & (USE_BASE \| USE_INDEX \| USE_SCALE \| USE_DISPLACEMENT8 \| USE_DISPLACEMENT16 \| USE_DISPLACEMENT32 \| USE_IMMEDIATE8 \| USE_IMMEDIATE16 \| USE_IMMEDIATE32 \| USE_IMMEDIATE16_SX8 \| USE_IMMEDIATE32_SX8))
171	return 0;
172
173	if (pParam->flags & USE_REG_GEN32)
174	return 4;
175
176	if (pParam->flags & USE_REG_GEN16)
177	return 2;
178
179	if (pParam->flags & USE_REG_GEN8)
180	return 1;
181
182	if (pParam->flags & USE_REG_SEG)
183	return 2;
184	return 0;
185	}
186
187	/**
188	* Returns the contents of register or immediate data of instruction's parameter.
189	*
190	* @returns true on success.
191	*
192	* @param pCpu Pointer to current disassembler context.
193	* @param pParam Pointer to parameter of instruction to proccess.
194	* @param pRegFrame Pointer to CPUMCTXCORE guest structure.
195	* @param pu32Data Where to store retrieved data.
196	* @param pcbSize Where to store the size of data (1, 2, 4).
197	*/
198	static bool iomGCGetRegImmData(PDISCPUSTATE pCpu, PCOP_PARAMETER pParam, PCPUMCTXCORE pRegFrame, uint32_t pu32Data, unsigned pcbSize)
199	{
200	if (pParam->flags & (USE_BASE \| USE_INDEX \| USE_SCALE \| USE_DISPLACEMENT8 \| USE_DISPLACEMENT16 \| USE_DISPLACEMENT32))
201	{
202	*pcbSize = 0;
203	*pu32Data = 0;
204	return false;
205	}
206
207	if (pParam->flags & USE_REG_GEN32)
208	{
209	*pcbSize = 4;
210	DISFetchReg32(pRegFrame, pParam->base.reg_gen32, pu32Data);
211	return true;
212	}
213
214	if (pParam->flags & USE_REG_GEN16)
215	{
216	*pcbSize = 2;
217	DISFetchReg16(pRegFrame, pParam->base.reg_gen16, (uint16_t *)pu32Data);
218	return true;
219	}
220
221	if (pParam->flags & USE_REG_GEN8)
222	{
223	*pcbSize = 1;
224	DISFetchReg8(pRegFrame, pParam->base.reg_gen8, (uint8_t *)pu32Data);
225	return true;
226	}
227
228	if (pParam->flags & (USE_IMMEDIATE32\|USE_IMMEDIATE32_SX8))
229	{
230	*pcbSize = 4;
231	*pu32Data = (uint32_t)pParam->parval;
232	return true;
233	}
234
235	if (pParam->flags & (USE_IMMEDIATE16\|USE_IMMEDIATE16_SX8))
236	{
237	*pcbSize = 2;
238	*pu32Data = (uint16_t)pParam->parval;
239	return true;
240	}
241
242	if (pParam->flags & USE_IMMEDIATE8)
243	{
244	*pcbSize = 1;
245	*pu32Data = (uint8_t)pParam->parval;
246	return true;
247	}
248
249	if (pParam->flags & USE_REG_SEG)
250	{
251	*pcbSize = 2;
252	DISFetchRegSeg(pRegFrame, pParam->base.reg_seg, (RTSEL *)pu32Data);
253	return true;
254	} /* Else - error. */
255
256	*pcbSize = 0;
257	*pu32Data = 0;
258	return false;
259	}
260
261
262	/**
263	* Saves data to 8/16/32 general purpose or segment register defined by
264	* instruction's parameter.
265	*
266	* @returns true on success.
267	* @param pCpu Pointer to current disassembler context.
268	* @param pParam Pointer to parameter of instruction to proccess.
269	* @param pRegFrame Pointer to CPUMCTXCORE guest structure.
270	* @param u32Data 8/16/32 bit data to store.
271	*/
272	static bool iomGCSaveDataToReg(PDISCPUSTATE pCpu, PCOP_PARAMETER pParam, PCPUMCTXCORE pRegFrame, unsigned u32Data)
273	{
274	if (pParam->flags & (USE_BASE \| USE_INDEX \| USE_SCALE \| USE_DISPLACEMENT8 \| USE_DISPLACEMENT16 \| USE_DISPLACEMENT32 \| USE_IMMEDIATE8 \| USE_IMMEDIATE16 \| USE_IMMEDIATE32 \| USE_IMMEDIATE32_SX8 \| USE_IMMEDIATE16_SX8))
275	{
276	return false;
277	}
278
279	if (pParam->flags & USE_REG_GEN32)
280	{
281	DISWriteReg32(pRegFrame, pParam->base.reg_gen32, u32Data);
282	return true;
283	}
284
285	if (pParam->flags & USE_REG_GEN16)
286	{
287	DISWriteReg16(pRegFrame, pParam->base.reg_gen16, (uint16_t)u32Data);
288	return true;
289	}
290
291	if (pParam->flags & USE_REG_GEN8)
292	{
293	DISWriteReg8(pRegFrame, pParam->base.reg_gen8, (uint8_t)u32Data);
294	return true;
295	}
296
297	if (pParam->flags & USE_REG_SEG)
298	{
299	DISWriteRegSeg(pRegFrame, pParam->base.reg_seg, (RTSEL)u32Data);
300	return true;
301	}
302
303	/* Else - error. */
304	return false;
305	}
306
307
308	/*
309	* Internal - statistics only.
310	*/
311	inline void iomGCMMIOStatLength(PVM pVM, unsigned cb)
312	{
313	#ifdef VBOX_WITH_STATISTICS
314	switch (cb)
315	{
316	case 1:
317	STAM_COUNTER_INC(&pVM->iom.s.StatGCMMIO1Byte);
318	break;
319	case 2:
320	STAM_COUNTER_INC(&pVM->iom.s.StatGCMMIO2Bytes);
321	break;
322	case 4:
323	STAM_COUNTER_INC(&pVM->iom.s.StatGCMMIO4Bytes);
324	break;
325	default:
326	/* No way. */
327	AssertMsgFailed(("Invalid data length %d\n", cb));
328	break;
329	}
330	#else
331	NOREF(pVM); NOREF(cb);
332	#endif
333	}
334
335
336	/**
337	* IN <AL\|AX\|EAX>, <DX\|imm16>
338	*
339	* @returns VBox status code.
340	*
341	* @param pVM The virtual machine (GC pointer ofcourse).
342	* @param pRegFrame Pointer to CPUMCTXCORE guest registers structure.
343	* @param pCpu Disassembler CPU state.
344	*/
345	IOMDECL(int) IOMInterpretIN(PVM pVM, PCPUMCTXCORE pRegFrame, PDISCPUSTATE pCpu)
346	{
347	#ifdef VBOX_WITH_STATISTICS
348	STAM_COUNTER_INC(&pVM->iom.s.StatGCInstIn);
349	#endif
350
351	/*
352	* Get port number from second parameter.
353	* And get the register size from the first parameter.
354	*/
355	uint32_t uPort = 0;
356	unsigned cbSize = 0;
357	bool fRc = iomGCGetRegImmData(pCpu, &pCpu->param2, pRegFrame, &uPort, &cbSize);
358	AssertMsg(fRc, ("Failed to get reg/imm port number!\n")); NOREF(fRc);
359
360	cbSize = iomGCGetRegSize(pCpu, &pCpu->param1);
361	Assert(cbSize > 0);
362	int rc = IOMInterpretCheckPortIOAccess(pVM, pRegFrame, uPort, cbSize);
363	if (rc == VINF_SUCCESS)
364	{
365	/*
366	* Attemp to read the port.
367	*/
368	uint32_t u32Data = ~0U;
369	rc = IOMIOPortRead(pVM, uPort, &u32Data, cbSize);
370	if (rc == VINF_SUCCESS)
371	{
372	/*
373	* Store the result in the AL\|AX\|EAX register.
374	*/
375	fRc = iomGCSaveDataToReg(pCpu, &pCpu->param1, pRegFrame, u32Data);
376	AssertMsg(fRc, ("Failed to store register value!\n")); NOREF(fRc);
377	}
378	}
379	return rc;
380	}
381
382
383	/**
384	* OUT <DX\|imm16>, <AL\|AX\|EAX>
385	*
386	* @returns VBox status code.
387	*
388	* @param pVM The virtual machine (GC pointer ofcourse).
389	* @param pRegFrame Pointer to CPUMCTXCORE guest registers structure.
390	* @param pCpu Disassembler CPU state.
391	*/
392	IOMDECL(int) IOMInterpretOUT(PVM pVM, PCPUMCTXCORE pRegFrame, PDISCPUSTATE pCpu)
393	{
394	#ifdef VBOX_WITH_STATISTICS
395	STAM_COUNTER_INC(&pVM->iom.s.StatGCInstOut);
396	#endif
397
398	/*
399	* Get port number from first parameter.
400	* And get the register size and value from the second parameter.
401	*/
402	uint32_t uPort = 0;
403	unsigned cbSize = 0;
404	bool fRc = iomGCGetRegImmData(pCpu, &pCpu->param1, pRegFrame, &uPort, &cbSize);
405	AssertMsg(fRc, ("Failed to get reg/imm port number!\n")); NOREF(fRc);
406
407	int rc = IOMInterpretCheckPortIOAccess(pVM, pRegFrame, uPort, cbSize);
408	if (rc == VINF_SUCCESS)
409	{
410	uint32_t u32Data = 0;
411	fRc = iomGCGetRegImmData(pCpu, &pCpu->param2, pRegFrame, &u32Data, &cbSize);
412	AssertMsg(fRc, ("Failed to get reg value!\n")); NOREF(fRc);
413
414	/*
415	* Attemp to write to the port.
416	*/
417	rc = IOMIOPortWrite(pVM, uPort, u32Data, cbSize);
418	}
419	return rc;
420	}
421
422
423	/**
424	* [REP*] INSB/INSW/INSD
425	* ES:EDI,DX[,ECX]
426	*
427	* @returns VBox status code.
428	*
429	* @param pVM The virtual machine (GC pointer ofcourse).
430	* @param pRegFrame Pointer to CPUMCTXCORE guest registers structure.
431	* @param pCpu Disassembler CPU state.
432	*/
433	IOMDECL(int) IOMInterpretINS(PVM pVM, PCPUMCTXCORE pRegFrame, PDISCPUSTATE pCpu)
434	{
435	#ifdef VBOX_WITH_STATISTICS
436	STAM_COUNTER_INC(&pVM->iom.s.StatGCInstIns);
437	#endif
438
439	/*
440	* We do not support REPNE, 16-bit addressing or decrementing destination
441	* pointer. Segment prefixes are deliberately ignored, as per the instruction specification.
442	*/
443	if ( pCpu->prefix & PREFIX_REPNE
444	\|\| (pCpu->addrmode != CPUMODE_32BIT)
445	\|\| pRegFrame->eflags.Bits.u1DF)
446	return VINF_IOM_HC_IOPORT_READ;
447
448	/*
449	* Get port number directly from the register (no need to bother the
450	* disassembler). And get the I/O register size from the opcode / prefix.
451	*/
452	uint32_t uPort = pRegFrame->edx & 0xffff;
453	unsigned cbSize = 0;
454	if (pCpu->pCurInstr->opcode == OP_INSB)
455	cbSize = 1;
456	else
457	cbSize = pCpu->opmode == CPUMODE_32BIT ? 4 : 2;
458
459	int rc = IOMInterpretCheckPortIOAccess(pVM, pRegFrame, uPort, cbSize);
460	if (rc == VINF_SUCCESS)
461	{
462	/*
463	* Get bytes/words/dwords count to transfer.
464	*/
465	RTGCUINTREG cTransfers = 1;
466	if (pCpu->prefix & PREFIX_REP)
467	{
468	cTransfers = pRegFrame->ecx;
469	if (!cTransfers)
470	return VINF_SUCCESS;
471	}
472
473	/* Convert destination address es:edi. */
474	RTGCPTR GCPtrDst;
475	rc = SELMToFlatEx(pVM, pRegFrame->eflags, pRegFrame->es, (RTGCPTR)pRegFrame->edi,
476	SELMTOFLAT_FLAGS_HYPER \| SELMTOFLAT_FLAGS_NO_PL,
477	&GCPtrDst, NULL);
478	if (VBOX_FAILURE(rc))
479	{
480	Log(("INS destination address conversion failed -> fallback, rc=%d\n", rc));
481	return VINF_IOM_HC_IOPORT_READ;
482	}
483
484	/* Access verification first; we can't recover from traps inside this instruction, as the port read cannot be repeated. */
485	uint32_t cpl = CPUMGetGuestCPL(pVM, pRegFrame);
486
487	rc = PGMVerifyAccess(pVM, (RTGCUINTPTR)GCPtrDst, cTransfers * cbSize,
488	X86_PTE_RW \| ((cpl == 3) ? X86_PTE_US : 0));
489	if (rc != VINF_SUCCESS)
490	{
491	Log(("INS will generate a trap -> fallback, rc=%d\n", rc));
492	return VINF_IOM_HC_IOPORT_READ;
493	}
494
495	Log(("IOMGC: rep ins%d port %#x count %d\n", cbSize * 8, uPort, cTransfers));
496	MMGCRamRegisterTrapHandler(pVM);
497
498	/* If the device supports string transfers, ask it to do as
499	* much as it wants. The rest is done with single-word transfers. */
500	const RTGCUINTREG cTransfersOrg = cTransfers;
501	rc = IOMIOPortReadString(pVM, uPort, &GCPtrDst, &cTransfers, cbSize);
502	AssertRC(rc); Assert(cTransfers <= cTransfersOrg);
503	pRegFrame->edi += (cTransfersOrg - cTransfers) * cbSize;
504
505	while (cTransfers && rc == VINF_SUCCESS)
506	{
507	uint32_t u32Value;
508	rc = IOMIOPortRead(pVM, uPort, &u32Value, cbSize);
509	if (rc == VINF_IOM_HC_IOPORT_READ \|\| VBOX_FAILURE(rc))
510	break;
511	int rc2 = MMGCRamWriteNoTrapHandler(GCPtrDst, &u32Value, cbSize);
512	Assert(rc2 == VINF_SUCCESS); NOREF(rc2);
513	GCPtrDst = (RTGCPTR)((RTGCUINTPTR)GCPtrDst + cbSize);
514	pRegFrame->edi += cbSize;
515	cTransfers--;
516	}
517	MMGCRamDeregisterTrapHandler(pVM);
518
519	/* Update ecx on exit. */
520	if (pCpu->prefix & PREFIX_REP)
521	pRegFrame->ecx = cTransfers;
522	}
523	return rc;
524	}
525
526
527	/**
528	* [REP*] OUTSB/OUTSW/OUTSD
529	* DS:ESI,DX[,ECX]
530	*
531	* @returns VBox status code.
532	*
533	* @param pVM The virtual machine (GC pointer ofcourse).
534	* @param pRegFrame Pointer to CPUMCTXCORE guest registers structure.
535	* @param pCpu Disassembler CPU state.
536	*/
537	IOMDECL(int) IOMInterpretOUTS(PVM pVM, PCPUMCTXCORE pRegFrame, PDISCPUSTATE pCpu)
538	{
539	#ifdef VBOX_WITH_STATISTICS
540	STAM_COUNTER_INC(&pVM->iom.s.StatGCInstOuts);
541	#endif
542
543	/*
544	* We do not support segment prefixes, REPNE, 16-bit addressing or
545	* decrementing source pointer.
546	*/
547	if ( pCpu->prefix & (PREFIX_SEG \| PREFIX_REPNE)
548	\|\| (pCpu->addrmode != CPUMODE_32BIT)
549	\|\| pRegFrame->eflags.Bits.u1DF)
550	return VINF_IOM_HC_IOPORT_WRITE;
551
552	/*
553	* Get port number from the first parameter.
554	* And get the I/O register size from the opcode / prefix.
555	*/
556	uint32_t uPort = 0;
557	unsigned cbSize = 0;
558	bool fRc = iomGCGetRegImmData(pCpu, &pCpu->param1, pRegFrame, &uPort, &cbSize);
559	AssertMsg(fRc, ("Failed to get reg/imm port number!\n")); NOREF(fRc);
560	if (pCpu->pCurInstr->opcode == OP_OUTSB)
561	cbSize = 1;
562	else
563	cbSize = pCpu->opmode == CPUMODE_32BIT ? 4 : 2;
564
565	int rc = IOMInterpretCheckPortIOAccess(pVM, pRegFrame, uPort, cbSize);
566	if (rc == VINF_SUCCESS)
567	{
568	/*
569	* Get bytes/words/dwords count to transfer.
570	*/
571	RTGCUINTREG cTransfers = 1;
572	if (pCpu->prefix & PREFIX_REP)
573	{
574	cTransfers = pRegFrame->ecx;
575	if (!cTransfers)
576	return VINF_SUCCESS;
577	}
578
579	/* Convert source address ds:esi. */
580	RTGCPTR GCPtrSrc;
581	rc = SELMToFlatEx(pVM, pRegFrame->eflags, pRegFrame->ds, (RTGCPTR)pRegFrame->esi,
582	SELMTOFLAT_FLAGS_HYPER \| SELMTOFLAT_FLAGS_NO_PL,
583	&GCPtrSrc, NULL);
584	if (VBOX_FAILURE(rc))
585	{
586	Log(("OUTS source address conversion failed -> fallback, rc=%d\n", rc));
587	return VINF_IOM_HC_IOPORT_WRITE;
588	}
589
590	/* Access verification first; we currently can't recover properly from traps inside this instruction */
591	uint32_t cpl = CPUMGetGuestCPL(pVM, pRegFrame);
592	rc = PGMVerifyAccess(pVM, (RTGCUINTPTR)GCPtrSrc, cTransfers * cbSize,
593	(cpl == 3) ? X86_PTE_US : 0);
594	if (rc != VINF_SUCCESS)
595	{
596	Log(("OUTS will generate a trap -> fallback, rc=%d\n", rc));
597	return VINF_IOM_HC_IOPORT_WRITE;
598	}
599
600	Log(("IOMGC: rep outs%d port %#x count %d\n", cbSize * 8, uPort, cTransfers));
601	MMGCRamRegisterTrapHandler(pVM);
602
603	/*
604	* If the device supports string transfers, ask it to do as
605	* much as it wants. The rest is done with single-word transfers.
606	*/
607	const RTGCUINTREG cTransfersOrg = cTransfers;
608	rc = IOMIOPortWriteString(pVM, uPort, &GCPtrSrc, &cTransfers, cbSize);
609	AssertRC(rc); Assert(cTransfers <= cTransfersOrg);
610	pRegFrame->esi += (cTransfersOrg - cTransfers) * cbSize;
611
612	while (cTransfers && rc == VINF_SUCCESS)
613	{
614	uint32_t u32Value;
615	rc = MMGCRamReadNoTrapHandler(&u32Value, GCPtrSrc, cbSize);
616	if (rc != VINF_SUCCESS)
617	break;
618	rc = IOMIOPortWrite(pVM, uPort, u32Value, cbSize);
619	if (rc == VINF_IOM_HC_IOPORT_WRITE)
620	break;
621	GCPtrSrc = (RTGCPTR)((RTUINTPTR)GCPtrSrc + cbSize);
622	pRegFrame->esi += cbSize;
623	cTransfers--;
624	}
625
626	MMGCRamDeregisterTrapHandler(pVM);
627
628	/* Update ecx on exit. */
629	if (pCpu->prefix & PREFIX_REP)
630	pRegFrame->ecx = cTransfers;
631	}
632	return rc;
633	}
634
635
636	/**
637	* Attempts to service an IN/OUT instruction.
638	*
639	* The \#GP trap handler in GC will call this function if the opcode causing the
640	* trap is a in or out type instruction.
641	*
642	* @returns VBox status code.
643	*
644	* @param pVM The virtual machine (GC pointer ofcourse).
645	* @param pRegFrame Pointer to CPUMCTXCORE guest registers structure.
646	* @param pCpu Disassembler CPU state.
647	*/
648	IOMGCDECL(int) IOMGCIOPortHandler(PVM pVM, PCPUMCTXCORE pRegFrame, PDISCPUSTATE pCpu)
649	{
650	switch (pCpu->pCurInstr->opcode)
651	{
652	case OP_IN:
653	return IOMInterpretIN(pVM, pRegFrame, pCpu);
654
655	case OP_OUT:
656	return IOMInterpretOUT(pVM, pRegFrame, pCpu);
657
658	case OP_INSB:
659	case OP_INSWD:
660	return IOMInterpretINS(pVM, pRegFrame, pCpu);
661
662	case OP_OUTSB:
663	case OP_OUTSWD:
664	return IOMInterpretOUTS(pVM, pRegFrame, pCpu);
665
666	/*
667	* The opcode wasn't know to us, freak out.
668	*/
669	default:
670	AssertMsgFailed(("Unknown I/O port access opcode %d.\n", pCpu->pCurInstr->opcode));
671	return VERR_INTERNAL_ERROR;
672	}
673	}
674

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source: vbox/trunk/src/VBox/VMM/VMMGC/IOMGC.cpp@ 1986

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