367 lines
10 KiB
C
367 lines
10 KiB
C
/*++
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Copyright (c) 1990 Microsoft Corporation
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Module Name:
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raisexcp.c
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Abstract:
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This module implements the internal kernel code to continue execution
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and raise a exception.
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Author:
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David N. Cutler (davec) 8-Aug-1990
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Environment:
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Kernel mode only.
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Revision History:
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--*/
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#include "ki.h"
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VOID
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KiContinuePreviousModeUser(
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IN PCONTEXT ContextRecord,
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IN PKEXCEPTION_FRAME ExceptionFrame,
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IN PKTRAP_FRAME TrapFrame,
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IN KPROCESSOR_MODE PreviousMode
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)
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/*++
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Routine Description:
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This function is called from KiContinue if PreviousMode is
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not KernelMode. In this case a kernel mode copy of the
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ContextRecord is made before calling KeContextToKframes.
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This is done in a seperate routine to save stack space for
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the common case which is PreviousMode == Kernel.
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N.B. This routine is called from within a try/except block
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that will be used to handle errors like invalid context.
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Arguments:
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ContextRecord - Supplies a pointer to a context record.
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ExceptionFrame - Supplies a pointer to an exception frame.
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TrapFrame - Supplies a pointer to a trap frame.
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PreviousMode - Not KernelMode.
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Return Value:
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None.
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--*/
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{
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CONTEXT ContextRecord2;
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//
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// Copy the context record to kernel mode space.
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//
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ProbeForReadSmallStructure(ContextRecord, sizeof(CONTEXT), CONTEXT_ALIGN);
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RtlCopyMemory(&ContextRecord2, ContextRecord, sizeof(CONTEXT));
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ContextRecord = &ContextRecord2;
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#ifdef _IA64_
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//
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// Make sure the user does not pass in a bougus RSE preload size.
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//
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ContextRecord2.RsRSC = ZERO_PRELOAD_SIZE(ContextRecord2.RsRSC);
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#endif
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//
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// Move information from the context record to the exception
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// and trap frames.
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//
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KeContextToKframes(TrapFrame,
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ExceptionFrame,
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&ContextRecord2,
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ContextRecord2.ContextFlags,
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PreviousMode);
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}
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NTSTATUS
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KiContinue (
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IN PCONTEXT ContextRecord,
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IN PKEXCEPTION_FRAME ExceptionFrame,
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IN PKTRAP_FRAME TrapFrame
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)
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/*++
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Routine Description:
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This function is called to copy the specified context frame to the
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specified exception and trap frames for the continue system service.
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Arguments:
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ContextRecord - Supplies a pointer to a context record.
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ExceptionFrame - Supplies a pointer to an exception frame.
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TrapFrame - Supplies a pointer to a trap frame.
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Return Value:
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STATUS_ACCESS_VIOLATION is returned if the context record is not readable
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from user mode.
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STATUS_DATATYPE_MISALIGNMENT is returned if the context record is not
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properly aligned.
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STATUS_SUCCESS is returned if the context frame is copied successfully
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to the specified exception and trap frames.
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--*/
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{
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KPROCESSOR_MODE PreviousMode;
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NTSTATUS Status;
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KIRQL OldIrql = PASSIVE_LEVEL;
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BOOLEAN IrqlChanged = FALSE;
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//
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// Synchronize with other context operations.
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//
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Status = STATUS_SUCCESS;
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//
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// Get the previous processor mode. If the previous processor mode is
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// user, we will probe and copy the specified context record.
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//
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PreviousMode = KeGetPreviousMode();
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if (KeGetCurrentIrql() < APC_LEVEL) {
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//
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// To support try-except and ExRaiseStatus in device driver code we
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// need to check if we are already at raised level.
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//
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IrqlChanged = TRUE;
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KeRaiseIrql(APC_LEVEL, &OldIrql);
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}
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//
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// Establish an exception handler and probe and capture the specified
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// context record if the previous mode is user. If the probe or copy
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// fails, then return the exception code as the function value. Else
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// copy the context record to the specified exception and trap frames,
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// and return success as the function value.
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//
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try {
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if (PreviousMode != KernelMode) {
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KiContinuePreviousModeUser(ContextRecord,
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ExceptionFrame,
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TrapFrame,
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PreviousMode);
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} else {
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//
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// Move information from the context record to the exception
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// and trap frames.
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//
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KeContextToKframes(TrapFrame,
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ExceptionFrame,
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ContextRecord,
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ContextRecord->ContextFlags,
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PreviousMode);
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}
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//
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// If an exception occurs during the probe or copy of the context
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// record, then always handle the exception and return the exception
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// code as the status value.
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//
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} except(EXCEPTION_EXECUTE_HANDLER) {
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Status = GetExceptionCode();
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}
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if (IrqlChanged) {
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KeLowerIrql (OldIrql);
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}
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return Status;
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}
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NTSTATUS
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KiRaiseException (
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IN PEXCEPTION_RECORD ExceptionRecord,
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IN PCONTEXT ContextRecord,
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IN PKEXCEPTION_FRAME ExceptionFrame,
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IN PKTRAP_FRAME TrapFrame,
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IN BOOLEAN FirstChance
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)
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/*++
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Routine Description:
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This function is called to raise an exception. The exception can be
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raised as a first or second chance exception.
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Arguments:
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ExceptionRecord - Supplies a pointer to an exception record.
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ContextRecord - Supplies a pointer to a context record.
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ExceptionFrame - Supplies a pointer to an exception frame.
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TrapFrame - Supplies a pointer to a trap frame.
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FirstChance - Supplies a boolean value that specifies whether this is
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the first (TRUE) or second (FALSE) chance for the exception.
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Return Value:
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STATUS_ACCESS_VIOLATION is returned if either the exception or the context
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record is not readable from user mode.
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STATUS_DATATYPE_MISALIGNMENT is returned if the exception record or the
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context record are not properly aligned.
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STATUS_INVALID_PARAMETER is returned if the number of exception parameters
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is greater than the maximum allowable number of exception parameters.
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STATUS_SUCCESS is returned if the exception is dispatched and handled.
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--*/
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{
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CONTEXT ContextRecord2;
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EXCEPTION_RECORD ExceptionRecord2;
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ULONG Length;
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ULONG Params;
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KPROCESSOR_MODE PreviousMode;
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//
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// Establish an exception handler and probe the specified exception and
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// context records for read accessibility. If the probe fails, then
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// return the exception code as the service status. Else call the exception
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// dispatcher to dispatch the exception.
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//
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try {
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//
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// Get the previous processor mode. If the previous processor mode
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// is user, then probe and copy the specified exception and context
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// records.
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//
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PreviousMode = KeGetPreviousMode();
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if (PreviousMode != KernelMode) {
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ProbeForReadSmallStructure(ContextRecord, sizeof(CONTEXT), CONTEXT_ALIGN);
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ProbeForReadSmallStructure(ExceptionRecord,
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FIELD_OFFSET (EXCEPTION_RECORD, NumberParameters) +
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sizeof (ExceptionRecord->NumberParameters), sizeof(ULONG));
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Params = ExceptionRecord->NumberParameters;
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if (Params > EXCEPTION_MAXIMUM_PARAMETERS) {
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return STATUS_INVALID_PARAMETER;
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}
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//
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// The exception record structure is defined unlike others with trailing
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// information as being its maximum size rather than just a single trailing
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// element.
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//
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Length = (sizeof(EXCEPTION_RECORD) -
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((EXCEPTION_MAXIMUM_PARAMETERS - Params) *
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sizeof(ExceptionRecord->ExceptionInformation[0])));
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//
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// The structure is currently less that 64k so we don't really need this probe.
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//
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ProbeForRead(ExceptionRecord, Length, sizeof(ULONG));
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//
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// Copy the exception and context record to local storage so an
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// access violation cannot occur during exception dispatching.
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//
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RtlCopyMemory(&ContextRecord2, ContextRecord, sizeof(CONTEXT));
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RtlCopyMemory(&ExceptionRecord2, ExceptionRecord, Length);
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ContextRecord = &ContextRecord2;
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ExceptionRecord = &ExceptionRecord2;
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#ifdef _IA64_
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//
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// Make sure the user does not pass in a bougus RSE preload size.
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//
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ContextRecord2.RsRSC = ZERO_PRELOAD_SIZE(ContextRecord2.RsRSC);
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#endif
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//
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// The number of parameters might have changed after we validated but before we
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// copied the structure. Fix this up as lower levels might not like this.
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//
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ExceptionRecord->NumberParameters = Params;
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}
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//
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// If an exception occurs during the probe of the exception or context
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// record, then always handle the exception and return the exception code
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// as the status value.
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//
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} except(EXCEPTION_EXECUTE_HANDLER) {
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return GetExceptionCode();
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}
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//
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// Move information from the context record to the exception and
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// trap frames.
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//
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KeContextToKframes(TrapFrame,
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ExceptionFrame,
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ContextRecord,
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ContextRecord->ContextFlags,
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PreviousMode);
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//
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// Make sure the reserved bit is clear in the exception code and
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// perform exception dispatching.
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//
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// N.B. The reserved bit is used to differentiate internally gerarated
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// codes from codes generated by application programs.
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//
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ExceptionRecord->ExceptionCode &= 0xefffffff;
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KiDispatchException(ExceptionRecord,
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ExceptionFrame,
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TrapFrame,
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PreviousMode,
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FirstChance);
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return STATUS_SUCCESS;
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}
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