130 lines
2.6 KiB
C
130 lines
2.6 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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context.c
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Abstract:
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This module contains the context management routines for
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Win32
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Author:
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Mark Lucovsky (markl) 28-Sep-1990
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Revision History:
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Thomas Van Baak (tvb) 22-Jul-1992
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Adapted for Alpha AXP.
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--*/
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#include "basedll.h"
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VOID
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BaseInitializeContext (
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OUT PCONTEXT Context,
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IN PVOID Parameter OPTIONAL,
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IN PVOID InitialPc OPTIONAL,
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IN PVOID InitialSp OPTIONAL,
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IN BASE_CONTEXT_TYPE ContextType
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)
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/*++
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Routine Description:
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This function initializes a context structure so that it can
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be used in a subsequent call to NtCreateThread.
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Arguments:
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Context - Supplies a context buffer to be initialized by this routine.
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Parameter - Supplies the thread's parameter.
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InitialPc - Supplies an initial program counter value.
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InitialSp - Supplies an initial stack pointer value.
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NewThread - Supplies a flag that specifies that this is a new
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thread, or a new process.
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Return Value:
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None.
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--*/
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{
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ULONG temp;
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PPEB Peb;
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Peb = NtCurrentPeb();
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//
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// Initialize the control registers.
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// So that the thread begins at BaseThreadStart
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//
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RtlZeroMemory((PVOID)Context, sizeof(CONTEXT));
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Context->IntGp = 1;
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Context->IntSp = (ULONGLONG)(LONG_PTR)InitialSp;
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Context->IntRa = 1;
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Context->ContextFlags = CONTEXT_FULL;
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if ( ContextType != BaseContextTypeProcess ) {
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if ( ContextType == BaseContextTypeThread ) {
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Context->Fir = (ULONGLONG)(LONG_PTR)BaseThreadStart;
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} else {
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Context->Fir = (ULONGLONG)(LONG_PTR)BaseFiberStart;
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}
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Context->IntA0 = (ULONGLONG)(LONG_PTR)InitialPc;
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Context->IntA1 = (ULONGLONG)(LONG_PTR)Parameter;
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Context->IntGp = (ULONGLONG)(LONG_PTR)RtlImageDirectoryEntryToData(
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Peb->ImageBaseAddress,
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TRUE,
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IMAGE_DIRECTORY_ENTRY_GLOBALPTR,
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&temp
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);
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}
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else {
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Context->Fir = (ULONGLONG)(LONG_PTR)BaseProcessStart;
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Context->IntA0 = (ULONGLONG)(LONG_PTR)InitialPc;
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}
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}
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VOID
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BaseFiberStart(
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VOID
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)
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/*++
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Routine Description:
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This function is called to start a Win32 fiber. Its purpose
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is to call BaseThreadStart, getting the necessary arguments
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from the fiber context record.
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Arguments:
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None.
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Return Value:
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None.
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--*/
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{
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PFIBER Fiber;
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Fiber = GetCurrentFiber();
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BaseThreadStart( (LPTHREAD_START_ROUTINE)Fiber->FiberContext.IntA0,
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(LPVOID)Fiber->FiberContext.IntA1 );
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}
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