148 lines
2.6 KiB
C
148 lines
2.6 KiB
C
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/*++
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Copyright (c) 2000 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 platform specific context management routines.
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Author:
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David N. Cutler (davec) 8-Jul-2000
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--*/
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#include "basedll.h"
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//
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// CALLFRAME represents the layout of the stack upon entry to a function,
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// including home locations for the first four parameters.
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//
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typedef struct _CALL_FRAME {
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PVOID ReturnAddress;
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PVOID Param1Home;
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PVOID Param2Home;
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PVOID Param3Home;
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PVOID Param4Home;
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} CALL_FRAME, *PCALL_FRAME;
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C_ASSERT((sizeof(CALL_FRAME) % 16) == 8);
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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 for use is an subsequent
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call to create a thread.
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Arguments:
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Context - Supplies a pointer to context record to be initialized.
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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 thread,
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fiber, or process.
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Return Value:
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None.
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--*/
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{
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PCALL_FRAME CallFrame;
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//
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// Initialize the context record so the thread will start execution
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// in the proper routine.
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//
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RtlZeroMemory((PVOID)Context, sizeof(CONTEXT));
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Context->ContextFlags = CONTEXT_CONTROL | CONTEXT_INTEGER;
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//
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// Build dummy call frame and return address on the stack.
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//
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CallFrame = (PCALL_FRAME)InitialSp - 1;
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CallFrame->ReturnAddress = NULL;
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Context->Rsp = (ULONG64)CallFrame;
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//
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// Initialize the start up parameters.
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//
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Context->Rcx = (ULONG64)InitialPc;
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Context->Rdx = (ULONG64)Parameter;
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//
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// Initialize the starting address dependent on the type of startup.
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//
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if (ContextType == BaseContextTypeProcess) {
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Context->Rip = (ULONG64)BaseProcessStart;
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} else if (ContextType == BaseContextTypeThread ) {
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Context->Rip = (ULONG64)BaseThreadStart;
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} else {
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Context->Rip = (ULONG64)BaseFiberStart;
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}
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return;
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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 starts a fiber by calling the thread start up routine with
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the proper parameters.
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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.Rcx,
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(LPVOID)Fiber->FiberContext.Rdx);
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return;
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}
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