153 lines
3.3 KiB
C
153 lines
3.3 KiB
C
|
/*++
|
|||
|
|
|
|||
|
|
Copyright (c) 1990 Microsoft Corporation
|
|||
|
|
|
|||
|
|
Module Name:
|
|||
|
|
|
|||
|
|
context.c
|
|||
|
|
|
|||
|
|
Abstract:
|
|||
|
|
|
|||
|
|
This module contains the context management routines for
|
|||
|
|
Win32
|
|||
|
|
|
|||
|
|
Author:
|
|||
|
|
|
|||
|
|
Mark Lucovsky (markl) 28-Sep-1990
|
|||
|
|
|
|||
|
|
Revision History:
|
|||
|
|
|
|||
|
|
--*/
|
|||
|
|
|
|||
|
|
#include "basedll.h"
|
|||
|
|
|
|||
|
|
extern PVOID BasepLockPrefixTable;
|
|||
|
|
|
|||
|
|
//
|
|||
|
|
// Specify address of kernel32 lock prefixes
|
|||
|
|
//
|
|||
|
|
IMAGE_LOAD_CONFIG_DIRECTORY _load_config_used = {
|
|||
|
|
0, // Reserved
|
|||
|
|
0, // Reserved
|
|||
|
|
0, // Reserved
|
|||
|
|
0, // Reserved
|
|||
|
|
0, // GlobalFlagsClear
|
|||
|
|
0, // GlobalFlagsSet
|
|||
|
|
0, // CriticalSectionTimeout (milliseconds)
|
|||
|
|
0, // DeCommitFreeBlockThreshold
|
|||
|
|
0, // DeCommitTotalFreeThreshold
|
|||
|
|
(ULONG) &BasepLockPrefixTable, // LockPrefixTable
|
|||
|
|
0, 0, 0, 0, 0, 0, 0 // Reserved
|
|||
|
|
};
|
|||
|
|
|
|||
|
|
VOID
|
|||
|
|
BaseInitializeContext(
|
|||
|
|
OUT PCONTEXT Context,
|
|||
|
|
IN PVOID Parameter OPTIONAL,
|
|||
|
|
IN PVOID InitialPc OPTIONAL,
|
|||
|
|
IN PVOID InitialSp OPTIONAL,
|
|||
|
|
IN BASE_CONTEXT_TYPE ContextType
|
|||
|
|
)
|
|||
|
|
|
|||
|
|
/*++
|
|||
|
|
|
|||
|
|
Routine Description:
|
|||
|
|
|
|||
|
|
This function initializes a context structure so that it can
|
|||
|
|
be used in a subsequent call to NtCreateThread.
|
|||
|
|
|
|||
|
|
Arguments:
|
|||
|
|
|
|||
|
|
Context - Supplies a context buffer to be initialized by this routine.
|
|||
|
|
|
|||
|
|
Parameter - Supplies the thread's parameter.
|
|||
|
|
|
|||
|
|
InitialPc - Supplies an initial program counter value.
|
|||
|
|
|
|||
|
|
InitialSp - Supplies an initial stack pointer value.
|
|||
|
|
|
|||
|
|
NewThread - Supplies a flag that specifies that this is a new
|
|||
|
|
thread, or a new process.
|
|||
|
|
|
|||
|
|
Return Value:
|
|||
|
|
|
|||
|
|
Raises STATUS_BAD_INITIAL_STACK if the value of InitialSp is not properly
|
|||
|
|
aligned.
|
|||
|
|
|
|||
|
|
Raises STATUS_BAD_INITIAL_PC if the value of InitialPc is not properly
|
|||
|
|
aligned.
|
|||
|
|
|
|||
|
|
--*/
|
|||
|
|
|
|||
|
|
{
|
|||
|
|
|
|||
|
|
Context->Eax = (ULONG)InitialPc;
|
|||
|
|
Context->Ebx = (ULONG)Parameter;
|
|||
|
|
|
|||
|
|
Context->SegGs = 0;
|
|||
|
|
Context->SegFs = KGDT_R3_TEB;
|
|||
|
|
Context->SegEs = KGDT_R3_DATA;
|
|||
|
|
Context->SegDs = KGDT_R3_DATA;
|
|||
|
|
Context->SegSs = KGDT_R3_DATA;
|
|||
|
|
Context->SegCs = KGDT_R3_CODE;
|
|||
|
|
|
|||
|
|
//
|
|||
|
|
// Start the thread at IOPL=3.
|
|||
|
|
//
|
|||
|
|
|
|||
|
|
Context->EFlags = 0x3000;
|
|||
|
|
|
|||
|
|
//
|
|||
|
|
// Always start the thread at the thread start thunk.
|
|||
|
|
//
|
|||
|
|
|
|||
|
|
Context->Esp = (ULONG) InitialSp;
|
|||
|
|
|
|||
|
|
if ( ContextType == BaseContextTypeThread ) {
|
|||
|
|
Context->Eip = (ULONG) BaseThreadStartThunk;
|
|||
|
|
}
|
|||
|
|
else if ( ContextType == BaseContextTypeFiber ) {
|
|||
|
|
Context->Eip = (ULONG) BaseFiberStart;
|
|||
|
|
}
|
|||
|
|
else {
|
|||
|
|
Context->Eip = (ULONG) BaseProcessStartThunk;
|
|||
|
|
}
|
|||
|
|
//
|
|||
|
|
// add code to check alignment and raise exception...
|
|||
|
|
//
|
|||
|
|
|
|||
|
|
Context->ContextFlags = CONTEXT_FULL;
|
|||
|
|
Context->Esp -= sizeof(Parameter); // Reserve room for ret address
|
|||
|
|
}
|
|||
|
|
|
|||
|
|
VOID
|
|||
|
|
BaseFiberStart(
|
|||
|
|
VOID
|
|||
|
|
)
|
|||
|
|
|
|||
|
|
/*++
|
|||
|
|
|
|||
|
|
Routine Description:
|
|||
|
|
|
|||
|
|
This function is called to start a Win32 fiber. Its purpose
|
|||
|
|
is to call BaseThreadStart, getting the necessary arguments
|
|||
|
|
from the fiber context record.
|
|||
|
|
|
|||
|
|
Arguments:
|
|||
|
|
|
|||
|
|
None.
|
|||
|
|
|
|||
|
|
Return Value:
|
|||
|
|
|
|||
|
|
None.
|
|||
|
|
|
|||
|
|
--*/
|
|||
|
|
|
|||
|
|
{
|
|||
|
|
PFIBER Fiber;
|
|||
|
|
|
|||
|
|
Fiber = GetCurrentFiber();
|
|||
|
|
BaseThreadStart( (LPTHREAD_START_ROUTINE)Fiber->FiberContext.Eax,
|
|||
|
|
(LPVOID)Fiber->FiberContext.Ebx );
|
|||
|
|
}
|