149 lines
3.8 KiB
C
149 lines
3.8 KiB
C
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/*++
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Copyright (c) 1990 Microsoft Corporation
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Module Name:
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apcuser.c
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Abstract:
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This module implements the machine dependent code necessary to initialize
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a user mode APC.
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Author:
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David N. Cutler (davec) 23-Apr-1990
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Environment:
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Kernel mode only, IRQL APC_LEVEL.
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Revision History:
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Thomas Van Baak (tvb) 13-May-1992
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Adapted for Alpha AXP.
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--*/
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#include "ki.h"
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VOID
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KiInitializeUserApc (
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IN PKEXCEPTION_FRAME ExceptionFrame,
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IN PKTRAP_FRAME TrapFrame,
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IN PKNORMAL_ROUTINE NormalRoutine,
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IN PVOID NormalContext,
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IN PVOID SystemArgument1,
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IN PVOID SystemArgument2
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)
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/*++
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Routine Description:
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This function is called to initialize the context for a user mode APC.
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Arguments:
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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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NormalRoutine - Supplies a pointer to the user mode APC routine.
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NormalContext - Supplies a pointer to the user context for the APC
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routine.
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SystemArgument1 - Supplies the first system supplied value.
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SystemArgument2 - Supplies the second system supplied value.
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Return Value:
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None.
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--*/
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{
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CONTEXT ContextRecord;
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EXCEPTION_RECORD ExceptionRecord;
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LONG_PTR Length;
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ULONG_PTR UserStack;
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//
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// Move the user mode state from the trap and exception frames to the
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// context frame.
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//
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ContextRecord.ContextFlags = CONTEXT_FULL;
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KeContextFromKframes(TrapFrame, ExceptionFrame, &ContextRecord);
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//
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// Transfer the context information to the user stack, initialize the
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// APC routine parameters, and modify the trap frame so execution will
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// continue in user mode at the user mode APC dispatch routine.
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//
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try {
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//
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// Compute length of context record and new aligned user stack pointer.
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//
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Length = (sizeof(CONTEXT) + 15) & (~15);
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UserStack = ((ULONG_PTR)ContextRecord.IntSp & (~15)) - Length;
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//
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// Probe user stack area for writeability and then transfer the
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// context record to the user stack.
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//
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ProbeForWrite((PVOID)UserStack, (ULONG)Length, sizeof(QUAD));
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RtlMoveMemory((PVOID)UserStack, &ContextRecord, sizeof(CONTEXT));
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//
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// Set the address of the user APC routine, the APC parameters, the
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// new frame pointer, and the new stack pointer in the current trap
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// frame. Set the continuation address so control will be transferred
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// to the user APC dispatcher.
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//
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// N.B. It is not possible to pass 64 bit arguments to the routine.
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// N.B. ULONG becomes canonical longword with (ULONGLONG)(LONG) cast.
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//
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//
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TrapFrame->IntSp = (ULONGLONG)(LONG_PTR)UserStack;
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TrapFrame->IntFp = (ULONGLONG)(LONG_PTR)UserStack;
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TrapFrame->IntA0 = (ULONGLONG)(LONG_PTR)NormalContext;
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TrapFrame->IntA1 = (ULONGLONG)(LONG_PTR)SystemArgument1;
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TrapFrame->IntA2 = (ULONGLONG)(LONG_PTR)SystemArgument2;
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TrapFrame->IntA3 = (ULONGLONG)(LONG_PTR)NormalRoutine;
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TrapFrame->Fir = (ULONGLONG)(LONG_PTR)KeUserApcDispatcher;
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//
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// If an exception occurs, then copy the exception information to an
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// exception record and handle the exception.
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//
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} except (KiCopyInformation(&ExceptionRecord,
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(GetExceptionInformation())->ExceptionRecord)) {
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//
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// Set the address of the exception to the current program address
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// and raise the exception by calling the exception dispatcher.
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//
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ExceptionRecord.ExceptionAddress = (PVOID)(TrapFrame->Fir);
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KiDispatchException(&ExceptionRecord,
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ExceptionFrame,
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TrapFrame,
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UserMode,
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TRUE);
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}
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return;
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}
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