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|
/* $Id$ */
/** @file
* BS3Kit - Bs3TrapDefaultHandler
*/
/*
* Copyright (C) 2007-2022 Oracle and/or its affiliates.
*
* This file is part of VirtualBox base platform packages, as
* available from https://www.virtualbox.org.
*
* This program 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 3 of the
* License.
*
* This program is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, see <https://www.gnu.org/licenses>.
*
* The contents of this file may alternatively be used under the terms
* of the Common Development and Distribution License Version 1.0
* (CDDL), a copy of it is provided in the "COPYING.CDDL" file included
* in the VirtualBox distribution, in which case the provisions of the
* CDDL are applicable instead of those of the GPL.
*
* You may elect to license modified versions of this file under the
* terms and conditions of either the GPL or the CDDL or both.
*
* SPDX-License-Identifier: GPL-3.0-only OR CDDL-1.0
*/
/*********************************************************************************************************************************
* Header Files *
*********************************************************************************************************************************/
#include "bs3kit-template-header.h"
#if TMPL_BITS != 64
# include <VBox/VMMDevTesting.h>
# include <iprt/asm-amd64-x86.h>
#endif
/*********************************************************************************************************************************
* Global Variables *
*********************************************************************************************************************************/
#define g_pBs3TrapSetJmpFrame BS3_DATA_NM(g_pBs3TrapSetJmpFrame)
extern uint32_t g_pBs3TrapSetJmpFrame;
#define g_Bs3TrapSetJmpCtx BS3_DATA_NM(g_Bs3TrapSetJmpCtx)
extern BS3REGCTX g_Bs3TrapSetJmpCtx;
#if TMPL_BITS != 64
/**
* V86 syscall handler.
*/
static void bs3TrapDefaultHandlerV8086Syscall(PBS3TRAPFRAME pTrapFrame)
{
/* Minimal syscall. */
uint16_t uSyscallNo = pTrapFrame->Ctx.rax.u16;
if (uSyscallNo == BS3_SYSCALL_PRINT_CHR)
Bs3PrintChr(pTrapFrame->Ctx.rcx.u8);
else if (uSyscallNo == BS3_SYSCALL_PRINT_STR)
Bs3PrintStrN(Bs3XptrFlatToCurrent(((uint32_t)pTrapFrame->Ctx.rcx.u16 << 4) + pTrapFrame->Ctx.rsi.u16),
pTrapFrame->Ctx.rdx.u16);
else if (uSyscallNo == BS3_SYSCALL_RESTORE_CTX)
Bs3RegCtxRestore(Bs3XptrFlatToCurrent(((uint32_t)pTrapFrame->Ctx.rcx.u16 << 4) + pTrapFrame->Ctx.rsi.u16),
pTrapFrame->Ctx.rdx.u16);
else if ( uSyscallNo == BS3_SYSCALL_TO_RING0
|| uSyscallNo == BS3_SYSCALL_TO_RING1
|| uSyscallNo == BS3_SYSCALL_TO_RING2
|| uSyscallNo == BS3_SYSCALL_TO_RING3)
{
Bs3RegCtxConvertToRingX(&pTrapFrame->Ctx, pTrapFrame->Ctx.rax.u16 - BS3_SYSCALL_TO_RING0);
}
else if (uSyscallNo == BS3_SYSCALL_SET_DRX)
{
uint32_t uValue = pTrapFrame->Ctx.rsi.u32;
switch (pTrapFrame->Ctx.rdx.u8)
{
case 0: ASMSetDR0(uValue); break;
case 1: ASMSetDR1(uValue); break;
case 2: ASMSetDR2(uValue); break;
case 3: ASMSetDR3(uValue); break;
case 6: ASMSetDR6(uValue); break;
case 7: ASMSetDR7(uValue); break;
default: Bs3Panic();
}
}
else if (uSyscallNo == BS3_SYSCALL_GET_DRX)
{
uint32_t uValue;
switch (pTrapFrame->Ctx.rdx.u8)
{
case 0: uValue = ASMGetDR0(); break;
case 1: uValue = ASMGetDR1(); break;
case 2: uValue = ASMGetDR2(); break;
case 3: uValue = ASMGetDR3(); break;
case 6: uValue = ASMGetDR6(); break;
case 7: uValue = ASMGetDR7(); break;
default: uValue = 0; Bs3Panic();
}
pTrapFrame->Ctx.rax.u32 = uValue;
pTrapFrame->Ctx.rdx.u32 = uValue >> 16;
}
else if (uSyscallNo == BS3_SYSCALL_SET_CRX)
{
uint32_t uValue = pTrapFrame->Ctx.rsi.u32;
switch (pTrapFrame->Ctx.rdx.u8)
{
case 0: ASMSetCR0(uValue); pTrapFrame->Ctx.cr0.u32 = uValue; break;
case 2: ASMSetCR2(uValue); pTrapFrame->Ctx.cr2.u32 = uValue; break;
case 3: ASMSetCR3(uValue); pTrapFrame->Ctx.cr3.u32 = uValue; break;
case 4: ASMSetCR4(uValue); pTrapFrame->Ctx.cr4.u32 = uValue; break;
default: Bs3Panic();
}
}
else if (uSyscallNo == BS3_SYSCALL_GET_CRX)
{
uint32_t uValue;
switch (pTrapFrame->Ctx.rdx.u8)
{
case 0: uValue = ASMGetCR0(); break;
case 2: uValue = ASMGetCR2(); break;
case 3: uValue = ASMGetCR3(); break;
case 4: uValue = ASMGetCR4(); break;
default: uValue = 0; Bs3Panic();
}
pTrapFrame->Ctx.rax.u32 = uValue;
pTrapFrame->Ctx.rdx.u32 = uValue >> 16;
}
else if (uSyscallNo == BS3_SYSCALL_SET_TR)
{
Bs3RegSetTr(pTrapFrame->Ctx.rdx.u16);
pTrapFrame->Ctx.tr = pTrapFrame->Ctx.rdx.u16;
}
else if (uSyscallNo == BS3_SYSCALL_GET_TR)
pTrapFrame->Ctx.rax.u16 = ASMGetTR();
else if (uSyscallNo == BS3_SYSCALL_SET_LDTR)
{
Bs3RegSetLdtr(pTrapFrame->Ctx.rdx.u16);
pTrapFrame->Ctx.ldtr = pTrapFrame->Ctx.rdx.u16;
}
else if (uSyscallNo == BS3_SYSCALL_GET_LDTR)
pTrapFrame->Ctx.rax.u16 = ASMGetLDTR();
else if (uSyscallNo == BS3_SYSCALL_SET_XCR0)
ASMSetXcr0(RT_MAKE_U64(pTrapFrame->Ctx.rsi.u32, pTrapFrame->Ctx.rdx.u32));
else if (uSyscallNo == BS3_SYSCALL_GET_XCR0)
{
uint64_t const uValue = ASMGetXcr0();
pTrapFrame->Ctx.rax.u32 = (uint32_t)uValue;
pTrapFrame->Ctx.rdx.u32 = (uint32_t)(uValue >> 32);
}
else
Bs3Panic();
}
#endif
#undef Bs3TrapDefaultHandler
BS3_CMN_DEF(void, Bs3TrapDefaultHandler,(PBS3TRAPFRAME pTrapFrame))
{
#if TMPL_BITS != 64
/*
* v8086 VMM tasks.
*/
//Bs3TestHostPrintf("Bs3____DefaultHandler: %02xh %04RX16:%08RX32 %08RX32 %04RX16:%08RX32 %d %d\n", pTrapFrame->bXcpt,
// pTrapFrame->Ctx.cs, pTrapFrame->Ctx.rip.u32, pTrapFrame->Ctx.rflags.u32, pTrapFrame->Ctx.ss,
// pTrapFrame->Ctx.rsp.u32, g_fBs3TrapNoV86Assist, 42);
if ((pTrapFrame->Ctx.rflags.u32 & X86_EFL_VM))
{
bool fHandled = true;
uint8_t cBitsOpcode = 16;
uint8_t bOpCode;
uint8_t const BS3_FAR *pbCodeStart;
uint8_t const BS3_FAR *pbCode;
uint16_t BS3_FAR *pusStack;
pusStack = (uint16_t BS3_FAR *)BS3_MAKE_PROT_R0PTR_FROM_REAL(pTrapFrame->Ctx.ss, pTrapFrame->Ctx.rsp.u16);
pbCode = (uint8_t const BS3_FAR *)BS3_MAKE_PROT_R0PTR_FROM_REAL(pTrapFrame->Ctx.cs, pTrapFrame->Ctx.rip.u16);
pbCodeStart = pbCode;
/*
* Deal with GPs in V8086 mode.
*/
if ( pTrapFrame->bXcpt == X86_XCPT_GP
&& !g_fBs3TrapNoV86Assist)
{
bOpCode = *pbCode++;
if (bOpCode == 0x66)
{
cBitsOpcode = 32;
bOpCode = *pbCode++;
}
/* INT xx: Real mode behaviour, but intercepting and implementing most of our syscall interface. */
if (bOpCode == 0xcd)
{
uint8_t bVector = *pbCode++;
if (bVector == BS3_TRAP_SYSCALL)
bs3TrapDefaultHandlerV8086Syscall(pTrapFrame);
else
{
/* Real mode behaviour. */
uint16_t BS3_FAR *pusIvte = (uint16_t BS3_FAR *)BS3_MAKE_PROT_R0PTR_FROM_REAL(0, 0);
pusIvte += (uint16_t)bVector *2;
pusStack[0] = pTrapFrame->Ctx.rflags.u16;
pusStack[1] = pTrapFrame->Ctx.cs;
pusStack[2] = pTrapFrame->Ctx.rip.u16 + (uint16_t)(pbCode - pbCodeStart);
pTrapFrame->Ctx.rip.u16 = pusIvte[0];
pTrapFrame->Ctx.cs = pusIvte[1];
pTrapFrame->Ctx.rflags.u16 &= ~X86_EFL_IF; /** @todo this isn't all, but it'll do for now, I hope. */
Bs3RegCtxRestore(&pTrapFrame->Ctx, 0/*fFlags*/); /* does not return. */
}
}
/* PUSHF: Real mode behaviour. */
else if (bOpCode == 0x9c)
{
if (cBitsOpcode == 32)
*pusStack++ = pTrapFrame->Ctx.rflags.au16[1] & ~(X86_EFL_VM | X86_EFL_RF);
*pusStack++ = pTrapFrame->Ctx.rflags.u16;
pTrapFrame->Ctx.rsp.u16 += cBitsOpcode / 8;
}
/* POPF: Real mode behaviour. */
else if (bOpCode == 0x9d)
{
if (cBitsOpcode == 32)
{
pTrapFrame->Ctx.rflags.u32 &= ~X86_EFL_POPF_BITS;
pTrapFrame->Ctx.rflags.u32 |= X86_EFL_POPF_BITS & *(uint32_t const *)pusStack;
}
else
{
pTrapFrame->Ctx.rflags.u32 &= ~(X86_EFL_POPF_BITS | UINT32_C(0xffff0000)) & ~X86_EFL_RF;
pTrapFrame->Ctx.rflags.u16 |= (uint16_t)X86_EFL_POPF_BITS & *pusStack;
}
pTrapFrame->Ctx.rsp.u16 -= cBitsOpcode / 8;
}
/* CLI: Real mode behaviour. */
else if (bOpCode == 0xfa)
pTrapFrame->Ctx.rflags.u16 &= ~X86_EFL_IF;
/* STI: Real mode behaviour. */
else if (bOpCode == 0xfb)
pTrapFrame->Ctx.rflags.u16 |= X86_EFL_IF;
/* OUT: byte I/O to VMMDev. */
else if ( bOpCode == 0xee
&& ((unsigned)(pTrapFrame->Ctx.rdx.u16 - VMMDEV_TESTING_IOPORT_BASE) < (unsigned)VMMDEV_TESTING_IOPORT_COUNT))
ASMOutU8(pTrapFrame->Ctx.rdx.u16, pTrapFrame->Ctx.rax.u8);
/* OUT: [d]word I/O to VMMDev. */
else if ( bOpCode == 0xef
&& ((unsigned)(pTrapFrame->Ctx.rdx.u16 - VMMDEV_TESTING_IOPORT_BASE) < (unsigned)VMMDEV_TESTING_IOPORT_COUNT))
{
if (cBitsOpcode != 32)
ASMOutU16(pTrapFrame->Ctx.rdx.u16, pTrapFrame->Ctx.rax.u16);
else
ASMOutU32(pTrapFrame->Ctx.rdx.u16, pTrapFrame->Ctx.rax.u32);
}
/* IN: byte I/O to VMMDev. */
else if ( bOpCode == 0xec
&& ((unsigned)(pTrapFrame->Ctx.rdx.u16 - VMMDEV_TESTING_IOPORT_BASE) < (unsigned)VMMDEV_TESTING_IOPORT_COUNT))
pTrapFrame->Ctx.rax.u8 = ASMInU8(pTrapFrame->Ctx.rdx.u16);
/* IN: [d]word I/O to VMMDev. */
else if ( bOpCode == 0xed
&& ((unsigned)(pTrapFrame->Ctx.rdx.u16 - VMMDEV_TESTING_IOPORT_BASE) < (unsigned)VMMDEV_TESTING_IOPORT_COUNT))
{
if (cBitsOpcode != 32)
pTrapFrame->Ctx.rax.u16 = ASMInU16(pTrapFrame->Ctx.rdx.u16);
else
pTrapFrame->Ctx.rax.u32 = ASMInU32(pTrapFrame->Ctx.rdx.u32);
}
/* Unexpected. */
else
fHandled = false;
}
/*
* Deal with lock prefixed int xxh syscall in v8086 mode.
*/
else if ( pTrapFrame->bXcpt == X86_XCPT_UD
&& pTrapFrame->Ctx.cs == BS3_SEL_TEXT16
&& pTrapFrame->Ctx.rax.u16 <= BS3_SYSCALL_LAST
&& pbCode[0] == 0xf0
&& pbCode[1] == 0xcd
&& pbCode[2] == BS3_TRAP_SYSCALL)
{
pbCode += 3;
bs3TrapDefaultHandlerV8086Syscall(pTrapFrame);
}
else
{
fHandled = false;
}
if (fHandled)
{
pTrapFrame->Ctx.rip.u16 += (uint16_t)(pbCode - pbCodeStart);
# if 0
Bs3Printf("Calling Bs3RegCtxRestore\n");
Bs3RegCtxPrint(&pTrapFrame->Ctx);
# endif
Bs3RegCtxRestore(&pTrapFrame->Ctx, 0 /*fFlags*/); /* does not return. */
return;
}
}
#endif
/*
* Any pending setjmp?
*/
if (g_pBs3TrapSetJmpFrame != 0)
{
PBS3TRAPFRAME pSetJmpFrame = (PBS3TRAPFRAME)Bs3XptrFlatToCurrent(g_pBs3TrapSetJmpFrame);
//Bs3Printf("Calling longjmp: pSetJmpFrame=%p (%#lx)\n", pSetJmpFrame, g_pBs3TrapSetJmpFrame);
g_pBs3TrapSetJmpFrame = 0;
Bs3MemCpy(pSetJmpFrame, pTrapFrame, sizeof(*pSetJmpFrame));
//Bs3RegCtxPrint(&g_Bs3TrapSetJmpCtx);
Bs3RegCtxRestore(&g_Bs3TrapSetJmpCtx, 0 /*fFlags*/);
}
/*
* Fatal.
*/
Bs3TestPrintf("*** GURU ***\n");
Bs3TrapPrintFrame(pTrapFrame);
Bs3Panic();
}
|
