211 lines
4.5 KiB
C
211 lines
4.5 KiB
C
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/*++
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Copyright (c) 1989 Microsoft Corporation
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Module Name:
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psctx.c
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Abstract:
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This procedure implements Get/Set Context Thread
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Author:
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Mark Lucovsky (markl) 25-May-1989
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Notes:
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There IS NO NonVolatileContext stored outside of the trap
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frame on a 386, with the exception of floating point. Hence,
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the NonVolatileContextPointers argument to Get/SetContext is
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always NULL on the 386.
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Revision History:
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8-Jan-90 bryanwi
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Port to 386
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--*/
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#include "psp.h"
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#define PSPALIGN_DOWN(address,amt) ((ULONG)(address) & ~(( amt ) - 1))
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#define PSPALIGN_UP(address,amt) (PSPALIGN_DOWN( (address + (amt) - 1), (amt) ))
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#ifdef ALLOC_PRAGMA
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#pragma alloc_text(PAGE,PspGetContext )
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#pragma alloc_text(PAGE,PspGetSetContextSpecialApc )
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#pragma alloc_text(PAGE,PspSetContext)
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#endif
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VOID
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PspGetContext(
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IN PKTRAP_FRAME TrapFrame,
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IN PKNONVOLATILE_CONTEXT_POINTERS NonVolatileContext,
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IN OUT PCONTEXT Context
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)
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/*++
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Routine Description:
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This function moves the contents of the specified trap and NonVolatile
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context into the specified context record. It's primary user will
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be NtGetContextThread.
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N.B. - NonVolatileContext is IGNORED on the 386.
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Arguments:
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TrapFrame - Supplies the contents of a trap frame that should be
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restored copied into the proper location in the context
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record.
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Context - Returns the threads current context.
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Return Value:
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None.
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--*/
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{
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UNREFERENCED_PARAMETER( NonVolatileContext );
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PAGED_CODE();
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KeContextFromKframes(TrapFrame, NULL, Context);
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}
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VOID
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PspSetContext(
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OUT PKTRAP_FRAME TrapFrame,
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OUT PKNONVOLATILE_CONTEXT_POINTERS NonVolatileContext,
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IN PCONTEXT Context,
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KPROCESSOR_MODE Mode
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)
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/*++
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Routine Description:
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This function moves the contents of the specified context record
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into the specified trap frame, and modifies the thread's non volatile
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context by storing through the thread's nonvolatile context pointers.
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N.B. - NonVolatileContext is IGNORED on the 386.
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Arguments:
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TrapFrame - Returns selected pieces of the context record.
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Context - Supplies a context record to be copied in the trap and
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nonvolatile context.
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Mode - Supplies the mode to be used when sanitizing the psr, epsr and fsr
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Return Value:
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None.
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--*/
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{
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UNREFERENCED_PARAMETER( NonVolatileContext );
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PAGED_CODE();
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KeContextToKframes(TrapFrame, NULL, Context, Context->ContextFlags, Mode);
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}
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VOID
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PspGetSetContextSpecialApc(
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IN PKAPC Apc,
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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 either captures the usermode state of the current
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thread, or sets the usermode state of the current thread. The
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operation type is determined by the value of SystemArgument1. A
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NULL value is used for get context, and a non-NULL value is used
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for set context.
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Arguments:
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Apc - Supplies a pointer to the APC control object that caused entry
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into this routine.
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NormalRoutine - Supplies a pointer to a pointer to the normal routine
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function that was specifed when the APC was initialized.
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NormalContext - Supplies a pointer to a pointer to an arbitrary data
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structure that was specified when the APC was initialized.
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SystemArgument1, SystemArgument2 - Supplies a set of two pointer to two
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arguments that contain untyped data.
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Return Value:
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None.
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--*/
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{
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PGETSETCONTEXT Ctx;
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PKTRAP_FRAME TrapFrame;
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PETHREAD Thread;
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PAGED_CODE();
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UNREFERENCED_PARAMETER( NormalRoutine );
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UNREFERENCED_PARAMETER( NormalContext );
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UNREFERENCED_PARAMETER( SystemArgument1 );
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UNREFERENCED_PARAMETER( SystemArgument2 );
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Ctx = CONTAINING_RECORD(Apc,GETSETCONTEXT,Apc);
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Thread = Apc->SystemArgument2;
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TrapFrame = 0;
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if (Ctx->Mode == KernelMode) {
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TrapFrame = Thread->Tcb.TrapFrame;
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}
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if (TrapFrame == NULL) {
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TrapFrame = (PKTRAP_FRAME)((PUCHAR)Thread->Tcb.InitialStack -
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PSPALIGN_UP(sizeof(KTRAP_FRAME),KTRAP_FRAME_ALIGN) -
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sizeof(FX_SAVE_AREA));
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}
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if ( Apc->SystemArgument1 ) {
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//
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// Set Context
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//
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PspSetContext(TrapFrame,NULL,&Ctx->Context,Ctx->Mode);
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} else {
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//
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// Get Context
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//
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PspGetContext(TrapFrame,NULL,&Ctx->Context);
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}
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KeSetEvent(&Ctx->OperationComplete,0,FALSE);
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}
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