TRPMR0.cpp revision fb5e37303b228a79c05cabfce2fe0fedfe32ed8a
/* $Id$ */
/** @file
* TRPM - The Trap Monitor - HC Ring 0
*/
/*
* Copyright (C) 2006 InnoTek Systemberatung GmbH
*
* This file is part of VirtualBox Open Source Edition (OSE), as
* available from http://www.virtualbox.org. This file is free software;
* you can redistribute it and/or modify it under the terms of the GNU
* General Public License as published by the Free Software Foundation,
* in version 2 as it comes in the "COPYING" file of the VirtualBox OSE
* distribution. VirtualBox OSE is distributed in the hope that it will
* be useful, but WITHOUT ANY WARRANTY of any kind.
*
* If you received this file as part of a commercial VirtualBox
* distribution, then only the terms of your commercial VirtualBox
* license agreement apply instead of the previous paragraph.
*/
/*******************************************************************************
* Header Files *
*******************************************************************************/
#define LOG_GROUP LOG_GROUP_TRPM
#include <VBox/trpm.h>
#include "TRPMInternal.h"
#include <VBox/vm.h>
#include <VBox/err.h>
#include <VBox/log.h>
#include <iprt/assert.h>
#include <iprt/asm.h>
/**
* Changes the VMMR0Entry() call frame and stack used by the IDT patch code
* so that we'll dispatch an interrupt rather than returning directly to Ring-3
* when VMMR0Entry() returns.
*
* @param pVM Pointer to the VM.
* @param pvRet Pointer to the return address of VMMR0Entry() on the stack.
*/
TRPMR0DECL(void) TRPMR0SetupInterruptDispatcherFrame(PVM pVM, void *pvRet)
{
RTUINT uActiveVector = pVM->trpm.s.uActiveVector;
pVM->trpm.s.uActiveVector = ~0;
if (uActiveVector >= 256)
{
AssertMsgFailed(("uActiveVector=%#x is invalid! (More assertions to come, please enjoy!)\n",
uActiveVector));
return;
}
#if HC_ARCH_BITS == 32
/*
* Get the handler pointer (16:32 ptr).
*/
RTIDTR Idtr;
ASMGetIDTR(&Idtr);
PVBOXIDTE pIdte = &((PVBOXIDTE)Idtr.pIdt)[uActiveVector];
if (!pIdte->Gen.u1Present)
{
AssertMsgFailed(("The IDT entry (%d) is not present!\n", uActiveVector));
return;
}
if ( pIdte->Gen.u3Type1 != VBOX_IDTE_TYPE1
&& pIdte->Gen.u5Type2 != VBOX_IDTE_TYPE2_INT_32)
{
AssertMsgFailed(("The IDT entry (%d) is not 32-bit int gate! type1=%#x type2=%#x\n",
uActiveVector, pIdte->Gen.u3Type1, pIdte->Gen.u5Type2));
return;
}
RTFAR32 pfnHandler;
pfnHandler.off = (pIdte->Gen.u16OffsetHigh << 16) | pIdte->Gen.u16OffsetLow;
pfnHandler.sel = pIdte->Gen.u16SegSel;
/*
* The stack frame is as follows:
*
* 1c iret frame
* 18 fs
* 14 ds
* 10 es
* c uArg
* 8 uOperation
* 4 pVM
* 0 return address (pvRet points here)
*
* We'll change the stackframe so that we will not return
* to the caller but to a interrupt dispatcher. We'll also
* setup the frame so that ds and es are moved to give room
* to a far return (to the handler).
*/
unsigned *pau = (unsigned *)pvRet;
pau[0] = (unsigned)trpmR0InterruptDispatcher; /* new return address */
pau[3] = pau[6]; /* uArg = fs */
pau[2] = pau[5]; /* uOperation = ds */
pau[5] = pfnHandler.off; /* ds = retf off */
pau[6] = pfnHandler.sel; /* fs = retf sel */
#else /* 64-bit: */
/*
* Get the handler pointer (16:48 ptr).
*/
RTIDTR Idtr;
ASMGetIDTR(&Idtr);
PVBOXIDTE pIdte = &((PVBOXIDTE)Idtr.pIdt)[uActiveVector * 2];
if (!pIdte->Gen.u1Present)
{
AssertMsgFailed(("The IDT entry (%d) is not present!\n", uActiveVector));
return;
}
if ( pIdte->Gen.u3Type1 != VBOX_IDTE_TYPE1
&& pIdte->Gen.u5Type2 != VBOX_IDTE_TYPE2_INT_32)
{
AssertMsgFailed(("The IDT entry (%d) is not 32-bit int gate! type1=%#x type2=%#x\n",
uActiveVector, pIdte->Gen.u3Type1, pIdte->Gen.u5Type2));
return;
}
RTFAR64 pfnHandler;
pfnHandler.off = (pIdte->Gen.u16OffsetHigh << 16) | pIdte->Gen.u16OffsetLow;
pfnHandler.off |= (uint64_t)(*(uint32_t *)(pIdte + 1)) << 32; //cleanup!
pfnHandler.sel = pIdte->Gen.u16SegSel;
/*
* The stack frame is as follows:
*
* 28 iret frame
* 20 dummy
* 14 uArg
* 10 uOperation
* 8 pVM
* 0 return address (pvRet points here)
*
* We'll change the stackframe so that we will not return
* to the caller but to a interrupt dispatcher. And we'll create
* a 64-bit far return frame where dummy and uArg is.
*/
uint64_t *pau = (uint64_t *)pvRet;
pau[0] = (uint64_t)trpmR0InterruptDispatcher; /* new return address */
pau[3] = pfnHandler.off; /* retf off */
pau[4] = pfnHandler.sel; /* retf sel */
#endif
// dprintf(("Interrupt: %04x:%08x vector %d\n", pfnHandler.sel, pfnHandler.off, uActiveVector));
}