VirtualBox

source: vbox/trunk/src/VBox/VMM/VMMGC/CPUMGC.cpp@ 29287

Last change on this file since 29287 was 28800, checked in by vboxsync, 15 years ago

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1/* $Id: CPUMGC.cpp 28800 2010-04-27 08:22:32Z vboxsync $ */
2/** @file
3 * CPUM - Guest Context Code.
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/*******************************************************************************
20* Header Files *
21*******************************************************************************/
22#define LOG_GROUP LOG_GROUP_CPUM
23#include <VBox/cpum.h>
24#include <VBox/vmm.h>
25#include <VBox/trpm.h>
26#include "CPUMInternal.h"
27#include <VBox/vm.h>
28#include <VBox/err.h>
29#include <iprt/assert.h>
30#include <VBox/log.h>
31
32
33/*******************************************************************************
34* Internal Functions *
35*******************************************************************************/
36RT_C_DECLS_BEGIN /* addressed from asm (not called so no DECLASM). */
37DECLCALLBACK(int) cpumGCHandleNPAndGP(PVM pVM, PCPUMCTXCORE pRegFrame, uintptr_t uUser);
38RT_C_DECLS_END
39
40
41/**
42 * Deal with traps occuring during segment loading and IRET
43 * when resuming guest context.
44 *
45 * @returns VBox status code.
46 * @param pVM The VM handle.
47 * @param pRegFrame The register frame.
48 * @param uUser User argument. In this case a combination of the
49 * CPUM_HANDLER_* \#defines.
50 */
51DECLCALLBACK(int) cpumGCHandleNPAndGP(PVM pVM, PCPUMCTXCORE pRegFrame, uintptr_t uUser)
52{
53 Log(("********************************************************\n"));
54 Log(("cpumGCHandleNPAndGP: eip=%RX32 uUser=%#x\n", pRegFrame->eip, uUser));
55 Log(("********************************************************\n"));
56
57 PVMCPU pVCpu = VMMGetCpu0(pVM);
58
59 /*
60 * Update the guest cpu state.
61 */
62 if (uUser & CPUM_HANDLER_CTXCORE_IN_EBP)
63 {
64 PCPUMCTXCORE pGstCtxCore = (PCPUMCTXCORE)CPUMGetGuestCtxCore(pVCpu);
65 PCCPUMCTXCORE pGstCtxCoreSrc = (PCPUMCTXCORE)pRegFrame->ebp;
66 *pGstCtxCore = *pGstCtxCoreSrc;
67 }
68
69 /*
70 * Take action based on what's happended.
71 */
72 switch (uUser & CPUM_HANDLER_TYPEMASK)
73 {
74 case CPUM_HANDLER_GS:
75 // if (!pVM->cpum.s.Guest.ldtr)
76 // {
77 // pRegFrame->gs = 0;
78 // pRegFrame->eip += 6; /* mov gs, [edx + CPUM.Guest.gs] */
79 // return VINF_SUCCESS;
80 // }
81 case CPUM_HANDLER_DS:
82 case CPUM_HANDLER_ES:
83 case CPUM_HANDLER_FS:
84 TRPMGCHyperReturnToHost(pVM, VINF_EM_RAW_STALE_SELECTOR);
85 break;
86
87 /* Make sure we restore the guest context from the interrupt stack frame. */
88 case CPUM_HANDLER_IRET:
89 {
90 PCPUMCTXCORE pGstCtxCore = (PCPUMCTXCORE)CPUMGetGuestCtxCore(pVCpu);
91 uint32_t *pEsp = (uint32_t *)pRegFrame->esp;
92
93 /* Sync general purpose registers */
94 *pGstCtxCore = *pRegFrame;
95
96 pGstCtxCore->eip = *pEsp++;
97 pGstCtxCore->cs = (RTSEL)*pEsp++;
98 pGstCtxCore->eflags.u32 = *pEsp++;
99 pGstCtxCore->esp = *pEsp++;
100 pGstCtxCore->ss = (RTSEL)*pEsp++;
101 if (pGstCtxCore->eflags.Bits.u1VM)
102 {
103 pGstCtxCore->es = (RTSEL)*pEsp++;
104 pGstCtxCore->ds = (RTSEL)*pEsp++;
105 pGstCtxCore->fs = (RTSEL)*pEsp++;
106 pGstCtxCore->gs = (RTSEL)*pEsp++;
107 }
108
109 TRPMGCHyperReturnToHost(pVM, VINF_EM_RAW_IRET_TRAP);
110 break;
111 }
112 }
113 return VERR_TRPM_DONT_PANIC;
114}
115
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