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1483 lines
36 KiB
1483 lines
36 KiB
/*++
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Module Name:
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ia32trap.c
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Abstract:
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This module contains iA32 trap handling code.
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Only used by kernel.
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Fault can ONLY be initiated from user mode code. There is no support
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for iA32 code in the kernel mode.
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For common pratice, we always return to the caller (lower level fault
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handler) and have the system do a normal ia64 exception dispatch. The
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wow64 code takes that exception and passes it back to the ia32 code
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as needed.
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Revision History:
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1 Feb. 1999 Initial Version
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16 Feb. 2000 SamerA Don't break on POPF/POPFD instructions and
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alignment faults for Wow64 processes.
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17 Oct. 2000 v-cspira Fix the emulation of smsw to handle the SIB byte
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31 Oct. 2000 SamerA Ia32 Lock prefix emulation.
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25 Sep. 2001 SamerA Stack-Selector (SS) Load instruction emulation.
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02 Mar. 2002 SamerA Security fixes.
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--*/
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#if DBG
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// Get all the iadebugging stuff when running a checked build
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#define IADBG 1
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#endif
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#include "ki.h"
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#include "ia32def.h"
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BOOLEAN
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KiIsTrapFrameModifiedAtApcLevel (
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IN PKTRAP_FRAME TrapFrame,
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BOOLEAN *IrqlChanged,
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KIRQL *OldIrql
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)
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/*++
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Routine Description
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This function verifies we are running at APC level, and if not, elevates the
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current thread's IRQL to APC level. It checks whether the trap frame has been
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modified.
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Arguments:
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Frame - Supply a pointer to an iA32 TrapFrame
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IrqlChanged - Pointer to boolean to indicate whether this function changed
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OldIrql - Old Irql value.
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Return:
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TRUE - Trap frame has been modified since established.
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FALSE - Trap frame has not been modified yet.
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--*/
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{
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//
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// Aquire APC_LEVEL so that SetContext calls on this thread are blocked.
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//
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if (KeGetCurrentIrql () < APC_LEVEL) {
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KeRaiseIrql (APC_LEVEL, OldIrql);
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*IrqlChanged = TRUE;
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} else {
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*OldIrql = PASSIVE_LEVEL;
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*IrqlChanged = FALSE;
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}
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return (((TrapFrame->EOFMarker & MODIFIED_FRAME) != 0) ? TRUE : FALSE);
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}
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VOID
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KiIA32CommonArgs (
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IN PKTRAP_FRAME Frame,
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IN NTSTATUS ExceptionCode,
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IN PVOID ExceptionAddress,
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IN ULONG_PTR Argument0,
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IN ULONG_PTR Argument1,
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IN ULONG_PTR Argument2
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)
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/*++
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Routine Description
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This routine sets up the ExceptionFrame
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Arguments:
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Frame - Supply a pointer to an iA32 TrapFrame
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ExceptionCode - Supplies a Exception Code
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ExceptionAddress - Supplies a pointer to user exception address
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Argument0, Argument1, Argument2 - Possible ExceptionInformation
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Return:
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Nothing
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--*/
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{
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PEXCEPTION_RECORD ExceptionRecord;
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ExceptionRecord = (PEXCEPTION_RECORD)&Frame->ExceptionRecord;
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ExceptionRecord->ExceptionRecord = (PEXCEPTION_RECORD)NULL;
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ExceptionRecord->ExceptionCode = ExceptionCode;
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ExceptionRecord->ExceptionFlags = 0;
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ExceptionRecord->ExceptionAddress = ExceptionAddress;
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ExceptionRecord->NumberParameters = 5;
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ExceptionRecord->ExceptionInformation[0] = Argument0;
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ExceptionRecord->ExceptionInformation[1] = Argument1;
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ExceptionRecord->ExceptionInformation[2] = Argument2;
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ExceptionRecord->ExceptionInformation[3] = (ULONG_PTR)Frame->StIIPA;
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ExceptionRecord->ExceptionInformation[4] = (ULONG_PTR)Frame->StISR;
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}
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BOOLEAN
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KiIA32ExceptionDivide(
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IN PKTRAP_FRAME Frame
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)
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/*++
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Routine Description:
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iA-32_Exception(Divide) - fault
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Handle divide error fault.
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Called from iA32_Exception() with
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ISR.vector : 0
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The divide error fault occurs if a DIV or IDIV instructions is
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executed with a divisor of 0, or if the quotient is too big to
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fit in the result operand.
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An INTEGER DIVIDED BY ZERO exception will be raised for the fault.
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The Faults can only come from user mode.
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Arguments:
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Frame - Supply a pointer to an iA32 TrapFrame
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Return value:
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--*/
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{
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//
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// Setup exception and back to caller
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//
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KiIA32CommonArgs(Frame,
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Ki386CheckDivideByZeroTrap(Frame),
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(PVOID) (ULONG_PTR) EIP(Frame),
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0, 0, 0);
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return TRUE;
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}
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BOOLEAN
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KiIA32ExceptionDebug(
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IN PKTRAP_FRAME Frame
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)
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/*++
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Routine Description:
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iA-32_Exception(Debug)
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Called from iA32_Exception() with
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ISR.Vector = 1
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Depend on ISR.Code
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0: It is Code BreakPoint Trap
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TrapCode: Can be Concurrent Single Step |
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Taken Branch | Data BreakPoint Trap
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Handler needs to decode ISR.Code to distinguish
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Note: EFlag isn't saved yet, so write directly to ar.24
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Arguments:
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Frame - Supply a pointer to an iA32 TrapFrame
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Return Value:
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No return
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--*/
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{
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ULONGLONG EFlag;
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#if defined(IADBG)
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IF_IA32TRAP_DEBUG( DEBUG )
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DbgPrint( "IA32 Debug: Eip 0x%p\n", EIP(Frame) );
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#endif // IADBG
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// Turn off the TF bit
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EFlag = __getReg(CV_IA64_AR24);
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EFlag &= ~EFLAGS_TF_BIT;
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__setReg(CV_IA64_AR24, EFlag);
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KiIA32CommonArgs(Frame,
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STATUS_WX86_SINGLE_STEP,
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(PVOID) (ULONG_PTR) EIP(Frame),
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0, 0, 0);
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return TRUE;
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}
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BOOLEAN
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KiIA32ExceptionBreak(
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IN PKTRAP_FRAME Frame
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)
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/*++
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Routine Description:
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iA-32_Exception(Break) - Trap
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BreakPoint instruction (INT 3) trigged a trap.
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Note: EFlag isn't saved yet, so write directly to ar.24
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Arguments:
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Frame - Supply a pointer to an iA32 TrapFrame
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Return Value:
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--*/
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{
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ULONGLONG EFlag;
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#if defined(IADBG)
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IF_IA32TRAP_DEBUG( BREAK )
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DbgPrint( "IA32 Break: Eip 0x%p\n", EIP(Frame) );
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#endif // IADBG
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// Turn off the TF bit
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EFlag = __getReg(CV_IA64_AR24);
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EFlag &= ~EFLAGS_TF_BIT;
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__setReg(CV_IA64_AR24, EFlag);
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KiIA32CommonArgs(Frame,
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STATUS_WX86_BREAKPOINT,
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(PVOID) (ULONG_PTR) EIP(Frame),
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BREAKPOINT_X86_BREAK,
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ECX(Frame),
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EDX(Frame));
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return TRUE;
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}
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BOOLEAN
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KiIA32ExceptionOverflow(
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IN PKTRAP_FRAME Frame
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)
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/*++
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Routine Description:
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iA-32_Exception(Overflow) - Trap
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ISR.Vector = 4
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Handle INTO overflow
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Eip - point to the address that next to the one causing INTO
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Occurres when INTO instruction as well as EFlags.OF is ON
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Trap only initiated from user mode
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Arguments:
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Frame - Supply a pointer to an iA32 TrapFrame
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Return Value:
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--*/
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{
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#if defined(IADBG)
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IF_IA32TRAP_DEBUG( OVERFLOW )
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DbgPrint( "IA32 OverFlow: Eip 0x%p\n", EIP(Frame) );
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#endif // IADBG
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//
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// All error, generate exception and Eip point to INTO instruction
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//
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KiIA32CommonArgs(Frame,
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STATUS_INTEGER_OVERFLOW,
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(PVOID) (ULONG_PTR) (EIP(Frame) - 1),
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0, 0, 0);
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return TRUE;
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}
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BOOLEAN
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KiIA32ExceptionBound(
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IN PKTRAP_FRAME Frame
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)
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/*++
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Routine Description:
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iA-32_Exception(Bound) - Fault
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Handle Bound check fault
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ISR.Vector = 5
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Eip - point to BOUND instruction
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The bound check fault occurs if a BOUND instruction finds that
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the tested value is outside the specified range.
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For bound check fault, an ARRAY BOUND EXCEEDED exception will be raised.
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Arguments:
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Frame - Supply a pointer to an iA32 TrapFrame
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Return Value:
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--*/
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{
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#if defined(IADBG)
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IF_IA32TRAP_DEBUG( BOUND )
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DbgPrint( "IA32 Bound: Eip 0x%p\n", EIP(Frame) );
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#endif // IADBG
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//
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// All error, generate exception with Eip point to BOUND instruction
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//
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KiIA32CommonArgs(Frame,
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STATUS_ARRAY_BOUNDS_EXCEEDED,
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(PVOID) (ULONG_PTR) EIP(Frame),
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0, 0, 0);
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return TRUE;
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}
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ULONG
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IA32EmulateSmsw(
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IN PKTRAP_FRAME Frame
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)
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/*++
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Routine Description:
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Emulate the SMSW instruction
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Arguments:
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Frame: Pointer to iA32 TrapFrame in the stack
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Return Value:
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Exception code
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--*/
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{
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ULONG Code;
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PUCHAR InstAddr;
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UINT_PTR EffectiveAddress;
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PUSHORT toAddr; // SMSW deals with 16 bits all the time...
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BOOLEAN RegisterMode;
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NTSTATUS status = STATUS_SUCCESS;
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//
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// Get the code for the prefix bytes that have already been grabbed
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// and placed into the IIM
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//
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Code = ISRCode(Frame);
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//
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// The operand size is always 16 for this instruction. We don't care about
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// overrides as the segment registers all contain the same thing.
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//
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//
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// Find the instruction in memory and point the Effective Address
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// at the byte after the opcode
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// Inst Address is start of ia32 inst + length of prefix + number of
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// bytes in opcode
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//
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InstAddr = (PUCHAR) (Frame->StIIP + ((Code >> 12) & 0xf) + 2);
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if (!KiIa32Compute32BitEffectiveAddress(Frame, &InstAddr, &EffectiveAddress, &RegisterMode)) {
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status = STATUS_ACCESS_VIOLATION;
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}
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if (NT_SUCCESS(status)) {
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//
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// The adress given to us hasn't been checked for user-space
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// validity, so check it now
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//
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toAddr = (PUSHORT) EffectiveAddress;
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try {
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//
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// Make sure we can write to the address
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//
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if (RegisterMode == FALSE) {
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ProbeForWriteSmallStructure(toAddr, sizeof(SHORT), 2);
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}
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//
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// and do the write
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//
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*toAddr = (SHORT) (__getReg(CV_IA64_AR27) & 0xffff);
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}
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except (EXCEPTION_EXECUTE_HANDLER) {
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//
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// return the exception
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//
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status = GetExceptionCode();
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}
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if (NT_SUCCESS(status)) {
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//
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// the store worked, so update the IIP so we can continue
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// executing
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//
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Frame->StIIP = (UINT_PTR) InstAddr;
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}
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}
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return status;
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}
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NTSTATUS
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IA32CheckOpcode(
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IN PKTRAP_FRAME Frame
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)
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/*++
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Routine Description:
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To identify the Opcode violation state
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Arguments:
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Frame: Pointer to iA32 TrapFrame in the stack
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Return Value:
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Exception code
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--*/
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{
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UCHAR OpCodeByte0;
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UCHAR OpCodeByte1;
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UCHAR OpCodeByte2;
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OpCodeByte0 = (UCHAR) Frame->StIIM & 0xff;
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OpCodeByte1 = (UCHAR) (Frame->StIIM >> 8) & 0xff;
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OpCodeByte2 = (UCHAR) (Frame->StIIM >> 16) & 0xff;
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switch (OpCodeByte0) {
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case MI_HLT:
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return (STATUS_PRIVILEGED_INSTRUCTION);
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break;
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case MI_TWO_BYTE:
|
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if ((OpCodeByte1 == MI_SMSW)
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&& ((OpCodeByte2 & MI_MODRM_MASK) == MI_SMSW_REGOP)) {
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//
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// We have the SMSW instruction
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// So now need to emulate it...
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//
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return (IA32EmulateSmsw(Frame));
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}
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else if ((OpCodeByte1 == MI_LTR_LLDT) ||
|
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(OpCodeByte2 == MI_LGDT_LIDT_LMSW)) {
|
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OpCodeByte2 &= MI_MODRM_MASK; // get bit 3-5 of ModRM byte
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|
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if (OpCodeByte2==MI_LLDT_MASK || OpCodeByte2==MI_LTR_MASK ||
|
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OpCodeByte2==MI_LGDT_MASK || OpCodeByte2==MI_LIDT_MASK ||
|
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OpCodeByte2==MI_LMSW_MASK) {
|
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return (STATUS_PRIVILEGED_INSTRUCTION);
|
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} else {
|
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return (STATUS_ACCESS_VIOLATION);
|
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}
|
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|
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} else {
|
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if (OpCodeByte1 & MI_SPECIAL_MOV_MASK) {
|
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//
|
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// mov may have special_mov_mask
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// but they are not 2 bytes OpCode
|
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//
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return (STATUS_PRIVILEGED_INSTRUCTION);
|
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} else {
|
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//
|
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// Do we need to further check if it is INVD, INVLPG ... ?
|
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//
|
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return (STATUS_ACCESS_VIOLATION);
|
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}
|
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}
|
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break;
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|
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default:
|
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//
|
|
// All other
|
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//
|
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return (STATUS_ILLEGAL_INSTRUCTION);
|
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break;
|
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}
|
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}
|
|
|
|
BOOLEAN
|
|
KiIA32InterceptInstruction(
|
|
IN PKTRAP_FRAME Frame
|
|
)
|
|
/*++
|
|
|
|
Routine Description:
|
|
iA-32_Exception(InstructionIntercept Opcode)
|
|
|
|
Program entry for either
|
|
1. IA-32 Invalid Opcode Fault #6, or
|
|
2. IA-32 interceptions(Inst)
|
|
|
|
Execution of unimplemented IA-32 opcodes, illegal opcodes or sensitive
|
|
privileged IA32 operating system instructions results this interception.
|
|
|
|
Possible Opcodes:
|
|
Privileged Opcodes: CLTS, HLT, INVD, INVLPG, LIDT, LMSW, LTR,
|
|
mov to/from CRs, DRs
|
|
RDMSR, RSM, SMSW, WBINVD, WRMSR
|
|
|
|
Arguments:
|
|
|
|
Frame - Supply a pointer to an iA32 TrapFrame
|
|
|
|
Return Value:
|
|
|
|
--*/
|
|
{
|
|
NTSTATUS status;
|
|
|
|
#if defined(IADBG)
|
|
IF_IA32TRAP_DEBUG( INSTRUCTION )
|
|
DbgPrint( "IA32 Instruction: Eip 0x%p\n", EIP(Frame) );
|
|
#endif // IADBG
|
|
|
|
status = IA32CheckOpcode(Frame);
|
|
switch (status) {
|
|
case STATUS_PRIVILEGED_INSTRUCTION:
|
|
KiIA32CommonArgs(Frame,
|
|
STATUS_PRIVILEGED_INSTRUCTION,
|
|
(PVOID) (ULONG_PTR) EIP(Frame),
|
|
0, 0, 0);
|
|
break;
|
|
|
|
case STATUS_ACCESS_VIOLATION:
|
|
KiIA32CommonArgs(Frame,
|
|
STATUS_ACCESS_VIOLATION,
|
|
(PVOID) (ULONG_PTR) EIP(Frame),
|
|
0, (ULONG_PTR)-1, 0);
|
|
break;
|
|
|
|
case STATUS_ILLEGAL_INSTRUCTION:
|
|
KiIA32CommonArgs(Frame,
|
|
STATUS_ILLEGAL_INSTRUCTION,
|
|
(PVOID) (ULONG_PTR) EIP(Frame),
|
|
0, (ULONG_PTR)-1, 0);
|
|
break;
|
|
|
|
case STATUS_SUCCESS:
|
|
//
|
|
// This means the OpCode was dealt with, so let the code continue
|
|
//
|
|
return FALSE;
|
|
|
|
default:
|
|
KiIA32CommonArgs(Frame,
|
|
status,
|
|
(PVOID) (ULONG_PTR) EIP(Frame),
|
|
0, (ULONG_PTR)-1, 0);
|
|
break;
|
|
}
|
|
|
|
return TRUE;
|
|
}
|
|
|
|
BOOLEAN
|
|
KiIA32ExceptionNoDevice(
|
|
IN PKTRAP_FRAME Frame
|
|
)
|
|
/*++
|
|
|
|
Routine Description:
|
|
|
|
iA-32_Exception(Coprocessor Not Available) - fault
|
|
|
|
This routine is called from iA32_Exception() with
|
|
ISR.Vector = 7
|
|
|
|
Note:
|
|
At this time, the AR registers have not been saved. This
|
|
includes, CFLAGS (AR.27), EFLAGS (AR.24), FCR (AR.21),
|
|
FSR (AR.28), FIR (AR.29) and FDR (AR.30).
|
|
|
|
Arguments:
|
|
|
|
Frame - iA32 TrapFrame that was saved in the memory stack
|
|
|
|
Return Value:
|
|
|
|
--*/
|
|
{
|
|
NTSTATUS ErrorCode;
|
|
ULONG FirOffset, FdrOffset;
|
|
ULONG FpState;
|
|
ULONGLONG FcrRegister, FsrRegister;
|
|
|
|
#if defined(IADBG)
|
|
IF_IA32TRAP_DEBUG( NODEVICE )
|
|
DbgPrint( "IA32 NoDevice: Eip 0x%p\n", EIP(Frame) );
|
|
#endif // IADBG
|
|
|
|
FcrRegister = __getReg(CV_IA64_AR21);
|
|
FsrRegister = __getReg(CV_IA64_AR28);
|
|
|
|
FirOffset = (ULONG) (__getReg(CV_IA64_AR29) & 0xFFFFFFFF);
|
|
FdrOffset = (ULONG) (__getReg(CV_IA64_AR30) & 0xFFFFFFFF);
|
|
|
|
|
|
//
|
|
// According to the floating error priority,
|
|
// we test what is the cause of the NPX error
|
|
// and raise an appropriate exception
|
|
//
|
|
FpState = (ULONG) (~(FcrRegister &
|
|
(FSW_INVALID_OPERATION | FSW_DENORMAL |
|
|
FSW_ZERO_DIVIDE | FSW_OVERFLOW |
|
|
FSW_UNDERFLOW | FSW_PRECISION)) &
|
|
(FsrRegister & FSW_ERR_MASK));
|
|
|
|
|
|
|
|
ErrorCode = 0;
|
|
|
|
if (FpState & FSW_INVALID_OPERATION) {
|
|
|
|
if (FpState & FSW_STACK_FAULT) {
|
|
KiIA32CommonArgs(Frame,
|
|
STATUS_FLOAT_STACK_CHECK,
|
|
(PVOID) (ULONG_PTR) FirOffset,
|
|
0, FdrOffset, 0);
|
|
return TRUE;
|
|
} else {
|
|
KiIA32CommonArgs(Frame,
|
|
STATUS_FLOAT_INVALID_OPERATION,
|
|
(PVOID) (ULONG_PTR) FirOffset,
|
|
0, 0, 0);
|
|
return TRUE;
|
|
}
|
|
|
|
} else {
|
|
|
|
//
|
|
// Follow the x86 priority of which exception to report if
|
|
// multiple bits are set
|
|
//
|
|
if (FpState & FSW_ZERO_DIVIDE) {
|
|
ErrorCode = STATUS_FLOAT_DIVIDE_BY_ZERO;
|
|
}
|
|
else if (FpState & FSW_DENORMAL) {
|
|
ErrorCode = STATUS_FLOAT_INVALID_OPERATION;
|
|
}
|
|
else if (FpState & FSW_OVERFLOW) {
|
|
ErrorCode = STATUS_FLOAT_OVERFLOW;
|
|
}
|
|
else if (FpState & FSW_UNDERFLOW) {
|
|
ErrorCode = STATUS_FLOAT_UNDERFLOW;
|
|
}
|
|
else if (FpState & FSW_PRECISION) {
|
|
ErrorCode = STATUS_FLOAT_INEXACT_RESULT;
|
|
}
|
|
}
|
|
|
|
//
|
|
// If we get here, we either have the error code, or
|
|
// we went through everything and saw nothing
|
|
//
|
|
if (ErrorCode) {
|
|
KiIA32CommonArgs(Frame,
|
|
ErrorCode,
|
|
(PVOID) (ULONG_PTR) FirOffset,
|
|
0, 0, 0);
|
|
return TRUE;
|
|
}
|
|
|
|
//
|
|
// FpState indicates no error, then something is wrong
|
|
// Panic the system !!!
|
|
//
|
|
// KeBugCheckEx(TRAP_CAUSE_UNKNOWN, (ULONG_PTR)Frame, 0, 0, 2);
|
|
//
|
|
// Turns out there is a bug in the chip and it can cause an fp fault even
|
|
// with a masked fp exception... So, don't bug check, count it
|
|
// as non-error and reset the fsr.es bit to try and avoid getting this
|
|
// exception in the future.
|
|
//
|
|
|
|
#if defined(IADBG)
|
|
DbgPrint( "IA32 Debug: Saw FP exception when FP exceptions are masked. Reseting fsr.es bit\n");
|
|
#endif // IADBG
|
|
|
|
|
|
FsrRegister &= ~((ULONGLONG) FSW_ERROR_SUMMARY);
|
|
__setReg(CV_IA64_AR28, FsrRegister);
|
|
|
|
return FALSE;
|
|
}
|
|
|
|
BOOLEAN
|
|
KiIA32ExceptionSegmentNotPresent(
|
|
IN PKTRAP_FRAME Frame
|
|
)
|
|
/*++
|
|
|
|
Routine Description:
|
|
iA-32_Exception(Not Present) - fault
|
|
|
|
Handle Segment Not Present fault.
|
|
ISR.Vector = 11
|
|
|
|
This exception occurs when the processor finds the P bit 0
|
|
when accessing an otherwise valid descriptor that is not to
|
|
be loaded in SS register.
|
|
|
|
Arguments:
|
|
|
|
Frame - iA32 TrapFrame that was saved in the memory stack
|
|
|
|
Return Value:
|
|
|
|
--*/
|
|
{
|
|
#if defined(IADBG)
|
|
IF_IA32TRAP_DEBUG( NOTPRESENT )
|
|
DbgPrint( "IA32 NotPresent: Eip 0x%p\n", EIP(Frame) );
|
|
#endif // IADBG
|
|
|
|
//
|
|
// Generate Exception for all other errors
|
|
//
|
|
|
|
KiIA32CommonArgs(Frame,
|
|
STATUS_ACCESS_VIOLATION,
|
|
(PVOID) (ULONG_PTR) EIP(Frame),
|
|
0, ISRCode(Frame) | RPL_MASK, 0);
|
|
return TRUE;
|
|
}
|
|
|
|
BOOLEAN
|
|
KiIA32ExceptionStack(
|
|
IN PKTRAP_FRAME Frame
|
|
)
|
|
/*++
|
|
|
|
Routine Description:
|
|
iA-32_Exception(Stack) - fault
|
|
|
|
ISR.Vector = 12
|
|
|
|
This exception occurs when the processor detects certain problem
|
|
with the segment addressed by the SS segment register:
|
|
|
|
1. A limit violation in the segment addressed by the SS (error
|
|
code = 0)
|
|
2. A limit vioalation in the inner stack during an interlevel
|
|
call or interrupt (error code = selector for the inner stack)
|
|
3. If the descriptor to be loaded into SS has its present bit 0
|
|
(error code = selector for the not-present segment)
|
|
|
|
The exception only occurred from user mode
|
|
|
|
Arguments:
|
|
|
|
Frame - iA32 TrapFrame that was saved in the memory stack
|
|
|
|
Return Value:
|
|
|
|
--*/
|
|
{
|
|
USHORT Code;
|
|
|
|
#if defined(IADBG)
|
|
IF_IA32TRAP_DEBUG( STACK )
|
|
DbgPrint( "IA32 Stack: Eip 0x%p\n", EIP(Frame) );
|
|
#endif // IADBG
|
|
|
|
//
|
|
// Dispatch Exception to user
|
|
//
|
|
|
|
Code = ISRCode(Frame);
|
|
|
|
//
|
|
// Code may contain the faulting selector
|
|
//
|
|
KiIA32CommonArgs(Frame,
|
|
STATUS_ACCESS_VIOLATION,
|
|
(PVOID) (ULONG_PTR) EIP(Frame),
|
|
Code ? (Code | RPL_MASK) : ESP(Frame),
|
|
Code ? EXCEPT_UNKNOWN_ACCESS : EXCEPT_LIMIT_ACCESS,
|
|
0);
|
|
return TRUE;
|
|
}
|
|
|
|
BOOLEAN
|
|
KiIA32ExceptionInvalidOp(
|
|
IN PKTRAP_FRAME Frame
|
|
)
|
|
/*++
|
|
|
|
Routine Description:
|
|
iA-32_Exception(Invalid Opcode) - fault
|
|
|
|
PKTRAP_FRAME Frame
|
|
Eip : virtual iA-32 instruction address
|
|
ISR.vector : 6
|
|
|
|
Note:
|
|
Only MMX and KNI instructions can cause this fault based
|
|
on values in CR0 and CR4
|
|
|
|
Arguments:
|
|
|
|
Frame - iA32 TrapFrame that was saved in the memory stack
|
|
|
|
Return Value:
|
|
--*/
|
|
{
|
|
#if defined(IADBG)
|
|
IF_IA32TRAP_DEBUG( INSTRUCTION )
|
|
DbgPrint( "IA32 Invalid Opcode: Eip 0x%p\n", EIP(Frame) );
|
|
#endif // IADBG
|
|
|
|
KiIA32CommonArgs(Frame,
|
|
STATUS_ILLEGAL_INSTRUCTION,
|
|
(PVOID) (ULONG_PTR) EIP(Frame),
|
|
0, 0, 0);
|
|
return TRUE;
|
|
}
|
|
|
|
BOOLEAN
|
|
KiIA32ExceptionGPFault(
|
|
IN PKTRAP_FRAME Frame
|
|
)
|
|
/*++
|
|
|
|
Routine Description:
|
|
iA-32_Exception(General Protection) - fault
|
|
|
|
PKTRAP_FRAME Frame
|
|
Eip : virtual iA-32 instruction address
|
|
ISR.vector : 13
|
|
ISR.code : ErrorCode
|
|
|
|
Note:
|
|
Previlidged instructions are intercepted,
|
|
see KiIA32InterceptInstruction
|
|
|
|
Arguments:
|
|
|
|
Frame - iA32 TrapFrame that was saved in the memory stack
|
|
|
|
Return Value:
|
|
|
|
--*/
|
|
{
|
|
UCHAR OpCode;
|
|
NTSTATUS Status;
|
|
|
|
#if defined(IADBG)
|
|
IF_IA32TRAP_DEBUG( GPFAULT )
|
|
DbgPrint( "IA32 GpFault: Eip 0x%p\n", EIP(Frame) );
|
|
#endif // IADBG
|
|
|
|
try {
|
|
ProbeForReadSmallStructure((VOID *)Frame->StIIP, sizeof(UCHAR), sizeof(UCHAR));
|
|
OpCode = *(UCHAR *)Frame->StIIP;
|
|
} except (EXCEPTION_EXECUTE_HANDLER) {
|
|
OpCode = 0xcc;
|
|
}
|
|
// This table comes from the IOInstructionTable in i386\trap.asm
|
|
switch (OpCode) {
|
|
case CLI_OP:
|
|
case STI_OP:
|
|
case 0xe4: case 0xe5: case 0xec: case 0xed: // IN
|
|
case 0x6c: case 0x6d: // INS
|
|
case 0xe6: case 0xe7: case 0xee: case 0xef: // OUT
|
|
case 0x6e: case 0x6f: // OUTS
|
|
Status = STATUS_PRIVILEGED_INSTRUCTION;
|
|
break;
|
|
|
|
default:
|
|
Status = STATUS_ACCESS_VIOLATION;
|
|
break;
|
|
}
|
|
|
|
|
|
KiIA32CommonArgs(Frame,
|
|
Status,
|
|
(PVOID) (ULONG_PTR) EIP(Frame),
|
|
0, 0, 0);
|
|
return TRUE;
|
|
}
|
|
|
|
|
|
|
|
BOOLEAN
|
|
KiIA32ExceptionKNI(
|
|
IN PKTRAP_FRAME Frame
|
|
)
|
|
/*++
|
|
|
|
iA32_Exception(KNI) - Fault
|
|
|
|
Unmasked KNI IA32 Error.
|
|
ISR.Vector = 19
|
|
|
|
--*/
|
|
{
|
|
NTSTATUS ErrorCode;
|
|
ULONG FpState;
|
|
ULONGLONG FcrRegister, FsrRegister;
|
|
|
|
#if defined(IADBG)
|
|
IF_IA32TRAP_DEBUG( FPFAULT )
|
|
DbgPrint( "IA32 KNI Fault: Eip 0x%p\n", EIP(Frame) );
|
|
#endif // IADBG
|
|
|
|
FcrRegister = __getReg(CV_IA64_AR21);
|
|
FsrRegister = __getReg(CV_IA64_AR28);
|
|
|
|
//
|
|
// Get the Katmai error state
|
|
// The trick here is that the state is in the same registers as the FP
|
|
// state and the bit positions are in the same relative location
|
|
// so just need to shift the bits and can use the same constants
|
|
// that we had for the x87 case
|
|
//
|
|
|
|
FpState = (ULONG) (~((FcrRegister >> KATMAI_SHIFT_CONTROL) & FSW_ERR_MASK) &
|
|
((FsrRegister >> KATMAI_SHIFT_STATUS) & FSW_ERR_MASK));
|
|
|
|
//
|
|
// FpState now has a 1 for any error that was unmasked
|
|
//
|
|
|
|
//
|
|
// Follow the x86 priority of which exception to report if
|
|
// multiple bits are set
|
|
//
|
|
if (FpState & FSW_INVALID_OPERATION) {
|
|
ErrorCode = STATUS_FLOAT_MULTIPLE_TRAPS;
|
|
}
|
|
else if (FpState & FSW_ZERO_DIVIDE) {
|
|
ErrorCode = STATUS_FLOAT_MULTIPLE_TRAPS;
|
|
}
|
|
else if (FpState & FSW_DENORMAL) {
|
|
ErrorCode = STATUS_FLOAT_MULTIPLE_TRAPS;
|
|
}
|
|
else if (FpState & FSW_OVERFLOW) {
|
|
ErrorCode = STATUS_FLOAT_MULTIPLE_FAULTS;
|
|
}
|
|
else if (FpState & FSW_UNDERFLOW) {
|
|
ErrorCode = STATUS_FLOAT_MULTIPLE_FAULTS;
|
|
}
|
|
else if (FpState & FSW_PRECISION) {
|
|
ErrorCode = STATUS_FLOAT_MULTIPLE_FAULTS;
|
|
}
|
|
else {
|
|
//
|
|
// We have a problem... Shouldn't get here
|
|
// as that means we took the exception, but no
|
|
// unmasked errors were found...
|
|
//
|
|
ErrorCode = 0;
|
|
}
|
|
|
|
//
|
|
// If we get here, we either have the error code, or
|
|
// we went through everything and saw nothing
|
|
//
|
|
if (ErrorCode) {
|
|
KiIA32CommonArgs(Frame,
|
|
ErrorCode,
|
|
(PVOID) (ULONG_PTR) EIP(Frame),
|
|
0, 0, 0);
|
|
return TRUE;
|
|
}
|
|
|
|
//
|
|
// FpState indicates no error, then something is wrong
|
|
// Panic the system !!!
|
|
//
|
|
KeBugCheckEx(TRAP_CAUSE_UNKNOWN, (ULONG_PTR)Frame, ISRVector(Frame), 0, 3);
|
|
}
|
|
|
|
|
|
BOOLEAN
|
|
KiIA32ExceptionFPFault(
|
|
IN PKTRAP_FRAME Frame
|
|
)
|
|
/*++
|
|
|
|
iA32_Exception(Floating Point) - Fault
|
|
|
|
Handle Coprocessor Error.
|
|
ISR.Vector = 16
|
|
|
|
This exception is used on 486 or above only. For i386, it uses
|
|
IRQ 13 instead.
|
|
|
|
JMPE instruction should flush all FP delayed exception, and the traps
|
|
will goto Device Not Available trap
|
|
|
|
--*/
|
|
{
|
|
#if defined(IADBG)
|
|
IF_IA32TRAP_DEBUG( FPFAULT )
|
|
DbgPrint( "IA32 FpFault: Eip 0x%p\n", EIP(Frame) );
|
|
#endif // IADBG
|
|
return(KiIA32ExceptionNoDevice(Frame));
|
|
}
|
|
|
|
|
|
BOOLEAN
|
|
KiIA32ExceptionAlignmentFault(
|
|
IN PKTRAP_FRAME Frame
|
|
)
|
|
/*++
|
|
|
|
iA32_Exception(Alignment Check) - fault
|
|
|
|
Handle alignment faults.
|
|
ISR.Vector = 17
|
|
|
|
This exception occurs when an unaligned data access is made by a thread
|
|
with alignment checking turned on.
|
|
|
|
This fault occurred when unaligned access on EM PSR.AC is ON
|
|
Note that iA32 EFLAFS.AC, CR0.AM and CPL!=3 does not unmask the fault.
|
|
|
|
So, for now, let the ia64 alignment handler handle this...
|
|
|
|
--*/
|
|
{
|
|
PPSR IntPSR;
|
|
|
|
#if defined(IADBG)
|
|
IF_IA32TRAP_DEBUG( ALIGNMENT )
|
|
DbgPrint( "IA32 Alignment: Eip 0x%p\n", EIP(Frame) );
|
|
#endif // IADBG
|
|
|
|
//
|
|
// Win32 x86 apps don't expect any alignment faults, so
|
|
// let's mask them out.
|
|
//
|
|
IntPSR = (PPSR)&Frame->StIPSR;
|
|
IntPSR->sb.psr_ac = 0;
|
|
|
|
return FALSE;
|
|
}
|
|
|
|
|
|
BOOLEAN
|
|
KiIA32InterruptVector(
|
|
IN PKTRAP_FRAME Frame
|
|
)
|
|
/*++
|
|
|
|
iA32_Interrupt(Vector #) - trap
|
|
|
|
Handle INTnn trap
|
|
|
|
Under EM system mode, iA32 INT instruction forces a mandatory iA-32
|
|
interrupt trap through iA-32 Interrupt(SoftWare Interrupt)
|
|
|
|
--*/
|
|
{
|
|
#if defined(IADBG)
|
|
IF_IA32TRAP_DEBUG( INTNN )
|
|
DbgPrint( "IA32 Intnn: Eip 0x%p INT 0x%x\n", EIP(Frame), ISRVector(Frame));
|
|
#endif // IADBG
|
|
KiIA32CommonArgs(Frame,
|
|
STATUS_PRIVILEGED_INSTRUCTION,
|
|
(PVOID) (ULONG_PTR) EIP(Frame),
|
|
0, 0, 0);
|
|
return TRUE;
|
|
}
|
|
|
|
|
|
BOOLEAN
|
|
KiIA32InterceptGate(
|
|
IN PKTRAP_FRAME Frame
|
|
)
|
|
/*++
|
|
|
|
Routine Description:
|
|
|
|
iA32_Intercept(Gate) - trap
|
|
|
|
If an iA32 control transfer is initiated through a GDT or LDT descriptor
|
|
that results in an either a promotion of privilege level (interlevel Call
|
|
or Jump Gate and IRET) or an iA32 task switch (TSS segment or Gate),
|
|
the intercept trap is generated.
|
|
|
|
Possible instructions intercepted:
|
|
CALL, RET, IRET, IRETD and JMP
|
|
|
|
Handling
|
|
No CaLL, RET, JMP, IRET, IRETD are allowed in any mode,
|
|
STATUS_ACCESS_VIOLATION is returned
|
|
|
|
Arguments:
|
|
Frame - iA32 TrapFrame that was saved in the memory stack
|
|
|
|
Return Value:
|
|
|
|
--*/
|
|
{
|
|
#if defined(IADBG)
|
|
IF_IA32TRAP_DEBUG( GATE )
|
|
DbgPrint( "IA32 Gate: Eip 0x%p GateSelector 0x%x OpcodeId 0x%x\n",
|
|
EIP(Frame),
|
|
(ULONG) (Frame->StIFA & 0xff),
|
|
(ULONG) (ISRCode(Frame) >> 14));
|
|
#endif // IADBG
|
|
|
|
//
|
|
// all error fall through here
|
|
//
|
|
KiIA32CommonArgs(Frame,
|
|
STATUS_ILLEGAL_INSTRUCTION,
|
|
(PVOID) (ULONG_PTR) EIP(Frame),
|
|
0, 0, 0);
|
|
return TRUE;
|
|
}
|
|
|
|
/*++
|
|
|
|
iA32_intercept(System Flag) - trap
|
|
|
|
Possible Causes:
|
|
1. if CFLAG.ii==1 and EFLAG.if changes state
|
|
2. Generated after either EFLAG.ac, tf or rf changes state
|
|
if no IOPL or CPL to modify bits then no interception.
|
|
3. if CFLG.nm==1 then successful execution of IRET also intercepted
|
|
|
|
Possible instructions:
|
|
CLI, POPF, POFD, STI and IRET
|
|
|
|
Currently, we set both CFLAG.ii and nm to 0, so that we will only possiblly
|
|
get case #2. But in EM/NT, it should always come from user land which
|
|
we hard-set EFLAG.IOPL to 0, so there if we do get case #2, then it is user
|
|
play around EFLAG.IOPL through JMPE. We should fail it.
|
|
|
|
--*/
|
|
|
|
BOOLEAN
|
|
KiIA32InterceptSystemFlag(
|
|
IN PKTRAP_FRAME Frame
|
|
)
|
|
{
|
|
BOOLEAN TrapFrameModified;
|
|
BOOLEAN RestoreIrql;
|
|
KIRQL OldIrql;
|
|
NTSTATUS NtStatus;
|
|
|
|
#if defined(IADBG)
|
|
IF_IA32TRAP_DEBUG( FLAG )
|
|
DbgPrint( "IA32 FLAG: Eip 0x%p Old EFlag: 0x%x OpcodeId 0x%x\n",
|
|
EIP(Frame),
|
|
(ULONG) (Frame->StIIM & 0xff),
|
|
(ULONG) (ISRCode(Frame) >> 14));
|
|
#endif // IADBG
|
|
|
|
|
|
//
|
|
// Don't trap on POPF/POPFD instructions from ia32 code.
|
|
// Allow Eflags.TF and/or Eflags.AC to be changed.
|
|
//
|
|
if ((ISRCode(Frame) >> 14) == 2)
|
|
{
|
|
return FALSE;
|
|
}
|
|
|
|
TrapFrameModified = KiIsTrapFrameModifiedAtApcLevel (Frame,
|
|
&RestoreIrql,
|
|
&OldIrql);
|
|
|
|
//
|
|
// If the frame has been modified, then restart execution.
|
|
//
|
|
|
|
if (TrapFrameModified == TRUE) {
|
|
|
|
NtStatus = STATUS_SUCCESS;
|
|
} else {
|
|
|
|
//
|
|
// Validate the instruction.
|
|
//
|
|
|
|
NtStatus = KiIa32ValidateInstruction (Frame);
|
|
}
|
|
|
|
if (RestoreIrql == TRUE) {
|
|
KeLowerIrql (OldIrql);
|
|
}
|
|
|
|
if (NT_SUCCESS (NtStatus))
|
|
{
|
|
return FALSE;
|
|
}
|
|
|
|
KiIA32CommonArgs(
|
|
Frame,
|
|
NtStatus,
|
|
(PVOID) (ULONG_PTR) EIP(Frame),
|
|
0, 0, 0);
|
|
|
|
return TRUE;
|
|
}
|
|
|
|
|
|
BOOLEAN
|
|
KiIA32InterceptLock(
|
|
IN PKTRAP_FRAME Frame
|
|
)
|
|
/*++
|
|
|
|
Routine Description:
|
|
iA32_Intercept(Lock) - trap
|
|
|
|
Lock intercepts occurred if platform or firmware code has disabled locked
|
|
transactions and atomic memory update requires a processor external
|
|
indication
|
|
|
|
Arguments:
|
|
Frame - Point to iA32 TrapFrame
|
|
|
|
Return:
|
|
|
|
--*/
|
|
{
|
|
BOOLEAN TrapFrameModified;
|
|
BOOLEAN RestoreIrql;
|
|
KIRQL OldIrql;
|
|
NTSTATUS NtStatus;
|
|
|
|
#if defined(IADBG)
|
|
IF_IA32TRAP_DEBUG( LOCK )
|
|
DbgPrint( "IA32 LOCK: Eip 0x%p\n", EIP(Frame) );
|
|
#endif // IADBG
|
|
|
|
TrapFrameModified = KiIsTrapFrameModifiedAtApcLevel (Frame,
|
|
&RestoreIrql,
|
|
&OldIrql);
|
|
|
|
//
|
|
// If the frame has been modified, then restart execution.
|
|
//
|
|
|
|
if (TrapFrameModified == TRUE) {
|
|
NtStatus = STATUS_SUCCESS;
|
|
} else {
|
|
|
|
//
|
|
// Emulate the lock prefix
|
|
//
|
|
|
|
NtStatus = KiIa32InterceptUnalignedLock (Frame);
|
|
}
|
|
|
|
if (RestoreIrql == TRUE) {
|
|
KeLowerIrql (OldIrql);
|
|
}
|
|
|
|
if (!NT_SUCCESS (NtStatus)) {
|
|
|
|
KiIA32CommonArgs(
|
|
Frame,
|
|
NtStatus,
|
|
(PVOID) (ULONG_PTR) EIP(Frame),
|
|
0,
|
|
0,
|
|
0
|
|
);
|
|
}
|
|
|
|
return (!NT_SUCCESS (NtStatus)) ? TRUE : FALSE;
|
|
}
|
|
|
|
BOOLEAN
|
|
KiIA32ExceptionPanic(
|
|
IN PKTRAP_FRAME Frame
|
|
)
|
|
{
|
|
//
|
|
// Panic the system
|
|
//
|
|
|
|
KeBugCheckEx(TRAP_CAUSE_UNKNOWN,
|
|
(ULONG_PTR)Frame,
|
|
ISRVector(Frame),
|
|
0,
|
|
0);
|
|
}
|
|
|
|
|
|
|
|
CONST BOOLEAN (*KiIA32ExceptionDispatchTable[])(PKTRAP_FRAME) = {
|
|
KiIA32ExceptionDivide,
|
|
KiIA32ExceptionDebug,
|
|
KiIA32ExceptionPanic,
|
|
KiIA32ExceptionBreak,
|
|
KiIA32ExceptionOverflow,
|
|
KiIA32ExceptionBound,
|
|
KiIA32ExceptionInvalidOp,
|
|
KiIA32ExceptionNoDevice,
|
|
KiIA32ExceptionPanic,
|
|
KiIA32ExceptionPanic,
|
|
KiIA32ExceptionPanic,
|
|
KiIA32ExceptionSegmentNotPresent,
|
|
KiIA32ExceptionStack,
|
|
KiIA32ExceptionGPFault,
|
|
KiIA32ExceptionPanic,
|
|
KiIA32ExceptionPanic,
|
|
KiIA32ExceptionFPFault,
|
|
KiIA32ExceptionAlignmentFault,
|
|
KiIA32ExceptionPanic,
|
|
KiIA32ExceptionKNI
|
|
};
|
|
|
|
CONST BOOLEAN (*KiIA32InterceptionDispatchTable[])(PKTRAP_FRAME) = {
|
|
KiIA32InterceptInstruction,
|
|
KiIA32InterceptGate,
|
|
KiIA32InterceptSystemFlag,
|
|
KiIA32ExceptionPanic,
|
|
KiIA32InterceptLock
|
|
};
|
|
|
|
#pragma warning(disable:4702) // unreachable code
|
|
BOOLEAN
|
|
KiIA32InterceptionVectorHandler(
|
|
IN PKTRAP_FRAME Frame
|
|
)
|
|
/*++
|
|
|
|
Routine Description:
|
|
|
|
KiIA32InterceptionVectorHandler
|
|
|
|
Called by first label KiIA32InterceptionVector() to handle further iA32
|
|
interception processing.
|
|
|
|
Arguments:
|
|
|
|
Frame - iA32 TrapFrame that was saved in the memory stack
|
|
|
|
Return Value:
|
|
TRUE - go to dispatch exception
|
|
FALSE - Exception was handled, do an RFI
|
|
|
|
--*/
|
|
{
|
|
#if defined(IADBG)
|
|
IF_IA32TRAP_DEBUG( INTERCEPTION )
|
|
DbgPrint("IA32 Interception: ISRVector 0x%x Frame 0x%p\n", ISRVector(Frame), Frame);
|
|
#endif // IADBG
|
|
|
|
ASSERT(UserMode == Frame->PreviousMode);
|
|
|
|
//
|
|
// Make sure we have an entry in the table for this interception
|
|
//
|
|
if (ISRVector(Frame) <= (sizeof(KiIA32InterceptionDispatchTable) / sizeof(PVOID)))
|
|
return (*KiIA32InterceptionDispatchTable[ISRVector(Frame)])(Frame);
|
|
else
|
|
return (KiIA32ExceptionPanic(Frame));
|
|
}
|
|
#pragma warning(default:4702)
|
|
|
|
#pragma warning(disable:4702) // unreachable code
|
|
BOOLEAN
|
|
KiIA32ExceptionVectorHandler(
|
|
IN PKTRAP_FRAME Frame
|
|
)
|
|
/*++
|
|
|
|
Routine Description:
|
|
|
|
KiIA32ExceptionVectorHandler
|
|
|
|
Called by first label KiIA32ExceptionVector() to handle further iA32
|
|
interception processing.
|
|
|
|
Arguments:
|
|
|
|
Frame - iA32 TrapFrame that was saved in the memory stack
|
|
|
|
Return Value:
|
|
TRUE - go to dispatch exception
|
|
FALSE - Exception was handled, do an RFI
|
|
|
|
--*/
|
|
{
|
|
#if defined(IADBG)
|
|
IF_IA32TRAP_DEBUG( EXCEPTION )
|
|
DbgPrint("IA32 Exception: ISRVector 0x%x Frame 0x%p\n", ISRVector(Frame), Frame);
|
|
#endif // IADBG
|
|
|
|
ASSERT(UserMode == Frame->PreviousMode);
|
|
//
|
|
// Make sure we have an entry in the table for this exception
|
|
//
|
|
if (ISRVector(Frame) <= (sizeof(KiIA32ExceptionDispatchTable) / sizeof(PVOID)))
|
|
return (*KiIA32ExceptionDispatchTable[ISRVector(Frame)])(Frame);
|
|
else
|
|
return(KiIA32ExceptionPanic(Frame));
|
|
}
|
|
#pragma warning(default:4702)
|
|
|
|
BOOLEAN
|
|
KiIA32InterruptionVectorHandler(
|
|
IN PKTRAP_FRAME Frame
|
|
)
|
|
/*++
|
|
|
|
Routine Description:
|
|
|
|
KiIA32InterruptionVectorHandler
|
|
|
|
Called by first label KiIA32InterruptionVector() to handle further iA32
|
|
interruption processing. Only get here on INT xx instructions
|
|
|
|
Arguments:
|
|
|
|
Frame - iA32 TrapFrame that was saved in the memory stack
|
|
|
|
Return Value:
|
|
TRUE - go to dispatch exception
|
|
FALSE - Exception was handled, do an RFI
|
|
|
|
--*/
|
|
{
|
|
#if defined(IADBG)
|
|
IF_IA32TRAP_DEBUG( INTERRUPT )
|
|
DbgPrint("IA32 Interruption: ISRVector 0x%x Frame 0x%p\n", ISRVector(Frame), Frame);
|
|
#endif // IADBG
|
|
|
|
ASSERT(UserMode == Frame->PreviousMode);
|
|
|
|
//
|
|
// Follow the ia32 way of INT xx as an Access Violation
|
|
//
|
|
// INT 3 should be handled via a debug exception and should
|
|
// never get here...
|
|
//
|
|
ASSERT(3 != ISRVector(Frame));
|
|
|
|
KiIA32CommonArgs(Frame,
|
|
STATUS_ACCESS_VIOLATION,
|
|
(PVOID) (ULONG_PTR) EIP(Frame),
|
|
0, 0, 0);
|
|
return TRUE;
|
|
}
|