| 1 | /* $Id: CPUMGC.cpp 28800 2010-04-27 08:22:32Z vboxsync $ */
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| 2 | /** @file
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| 3 | * CPUM - Guest Context Code.
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| 4 | */
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| 5 |
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| 6 | /*
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| 7 | * Copyright (C) 2006-2007 Oracle Corporation
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| 8 | *
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| 9 | * This file is part of VirtualBox Open Source Edition (OSE), as
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| 10 | * available from http://www.virtualbox.org. This file is free software;
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| 11 | * you can redistribute it and/or modify it under the terms of the GNU
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| 12 | * General Public License (GPL) as published by the Free Software
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| 13 | * Foundation, in version 2 as it comes in the "COPYING" file of the
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| 14 | * VirtualBox OSE distribution. VirtualBox OSE is distributed in the
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| 15 | * hope that it will be useful, but WITHOUT ANY WARRANTY of any kind.
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| 16 | */
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| 17 |
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| 18 |
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| 19 | /*******************************************************************************
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| 20 | * Header Files *
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| 21 | *******************************************************************************/
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| 22 | #define LOG_GROUP LOG_GROUP_CPUM
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| 23 | #include <VBox/cpum.h>
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| 24 | #include <VBox/vmm.h>
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| 25 | #include <VBox/trpm.h>
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| 26 | #include "CPUMInternal.h"
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| 27 | #include <VBox/vm.h>
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| 28 | #include <VBox/err.h>
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| 29 | #include <iprt/assert.h>
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| 30 | #include <VBox/log.h>
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| 31 |
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| 32 |
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| 33 | /*******************************************************************************
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| 34 | * Internal Functions *
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| 35 | *******************************************************************************/
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| 36 | RT_C_DECLS_BEGIN /* addressed from asm (not called so no DECLASM). */
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| 37 | DECLCALLBACK(int) cpumGCHandleNPAndGP(PVM pVM, PCPUMCTXCORE pRegFrame, uintptr_t uUser);
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| 38 | RT_C_DECLS_END
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| 39 |
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| 40 |
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| 41 | /**
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| 42 | * Deal with traps occuring during segment loading and IRET
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| 43 | * when resuming guest context.
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| 44 | *
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| 45 | * @returns VBox status code.
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| 46 | * @param pVM The VM handle.
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| 47 | * @param pRegFrame The register frame.
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| 48 | * @param uUser User argument. In this case a combination of the
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| 49 | * CPUM_HANDLER_* \#defines.
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| 50 | */
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| 51 | DECLCALLBACK(int) cpumGCHandleNPAndGP(PVM pVM, PCPUMCTXCORE pRegFrame, uintptr_t uUser)
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| 52 | {
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| 53 | Log(("********************************************************\n"));
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| 54 | Log(("cpumGCHandleNPAndGP: eip=%RX32 uUser=%#x\n", pRegFrame->eip, uUser));
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| 55 | Log(("********************************************************\n"));
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| 56 |
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| 57 | PVMCPU pVCpu = VMMGetCpu0(pVM);
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| 58 |
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| 59 | /*
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| 60 | * Update the guest cpu state.
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| 61 | */
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| 62 | if (uUser & CPUM_HANDLER_CTXCORE_IN_EBP)
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| 63 | {
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| 64 | PCPUMCTXCORE pGstCtxCore = (PCPUMCTXCORE)CPUMGetGuestCtxCore(pVCpu);
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| 65 | PCCPUMCTXCORE pGstCtxCoreSrc = (PCPUMCTXCORE)pRegFrame->ebp;
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| 66 | *pGstCtxCore = *pGstCtxCoreSrc;
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| 67 | }
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| 68 |
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| 69 | /*
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| 70 | * Take action based on what's happended.
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| 71 | */
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| 72 | switch (uUser & CPUM_HANDLER_TYPEMASK)
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| 73 | {
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| 74 | case CPUM_HANDLER_GS:
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| 75 | // if (!pVM->cpum.s.Guest.ldtr)
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| 76 | // {
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| 77 | // pRegFrame->gs = 0;
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| 78 | // pRegFrame->eip += 6; /* mov gs, [edx + CPUM.Guest.gs] */
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| 79 | // return VINF_SUCCESS;
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| 80 | // }
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| 81 | case CPUM_HANDLER_DS:
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| 82 | case CPUM_HANDLER_ES:
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| 83 | case CPUM_HANDLER_FS:
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| 84 | TRPMGCHyperReturnToHost(pVM, VINF_EM_RAW_STALE_SELECTOR);
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| 85 | break;
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| 86 |
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| 87 | /* Make sure we restore the guest context from the interrupt stack frame. */
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| 88 | case CPUM_HANDLER_IRET:
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| 89 | {
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| 90 | PCPUMCTXCORE pGstCtxCore = (PCPUMCTXCORE)CPUMGetGuestCtxCore(pVCpu);
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| 91 | uint32_t *pEsp = (uint32_t *)pRegFrame->esp;
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| 92 |
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| 93 | /* Sync general purpose registers */
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| 94 | *pGstCtxCore = *pRegFrame;
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| 95 |
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| 96 | pGstCtxCore->eip = *pEsp++;
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| 97 | pGstCtxCore->cs = (RTSEL)*pEsp++;
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| 98 | pGstCtxCore->eflags.u32 = *pEsp++;
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| 99 | pGstCtxCore->esp = *pEsp++;
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| 100 | pGstCtxCore->ss = (RTSEL)*pEsp++;
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| 101 | if (pGstCtxCore->eflags.Bits.u1VM)
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| 102 | {
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| 103 | pGstCtxCore->es = (RTSEL)*pEsp++;
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| 104 | pGstCtxCore->ds = (RTSEL)*pEsp++;
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| 105 | pGstCtxCore->fs = (RTSEL)*pEsp++;
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| 106 | pGstCtxCore->gs = (RTSEL)*pEsp++;
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| 107 | }
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| 108 |
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| 109 | TRPMGCHyperReturnToHost(pVM, VINF_EM_RAW_IRET_TRAP);
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| 110 | break;
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| 111 | }
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| 112 | }
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| 113 | return VERR_TRPM_DONT_PANIC;
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| 114 | }
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| 115 |
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