mirror of
https://github.com/reactos/reactos.git
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81 lines
2.4 KiB
C
81 lines
2.4 KiB
C
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/*
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* COPYRIGHT: See COPYING in the top level directory
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* PROJECT: ReactOS system libraries
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* PURPOSE: Rtl user thread functions
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* FILE: lib/rtl/thread.c
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* PROGRAMERS:
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* Alex Ionescu (alex@relsoft.net)
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* Eric Kohl
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* KJK::Hyperion
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*/
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/* INCLUDES *****************************************************************/
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#include <rtl.h>
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#include "i386/ketypes.h"
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#define NDEBUG
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#include <debug.h>
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/* PRIVATE FUNCTIONS *******************************************************/
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/*
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* @implemented
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*/
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VOID
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NTAPI
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RtlInitializeContext(IN HANDLE ProcessHandle,
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OUT PCONTEXT ThreadContext,
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IN PVOID ThreadStartParam OPTIONAL,
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IN PTHREAD_START_ROUTINE ThreadStartAddress,
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IN PINITIAL_TEB InitialTeb)
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{
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DPRINT("RtlInitializeContext: (hProcess: %p, ThreadContext: %p, Teb: %p\n",
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ProcessHandle, ThreadContext, InitialTeb);
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/*
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* Set the Initial Registers
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* This is based on NT's default values -- crazy apps might expect this...
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*/
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ThreadContext->Ebp = 0;
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ThreadContext->Eax = 0;
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ThreadContext->Ebx = 1;
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ThreadContext->Ecx = 2;
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ThreadContext->Edx = 3;
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ThreadContext->Esi = 4;
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ThreadContext->Edi = 5;
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/* Set the Selectors */
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ThreadContext->SegGs = 0;
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ThreadContext->SegFs = KGDT_R3_TEB;
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ThreadContext->SegEs = KGDT_R3_DATA;
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ThreadContext->SegDs = KGDT_R3_DATA;
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ThreadContext->SegSs = KGDT_R3_DATA;
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ThreadContext->SegCs = KGDT_R3_CODE;
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/* Enable Interrupts */
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ThreadContext->EFlags = EFLAGS_INTERRUPT_MASK;
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/* Settings passed */
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ThreadContext->Eip = (ULONG)ThreadStartAddress;
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ThreadContext->Esp = (ULONG)InitialTeb;
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/* Only the basic Context is initialized */
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ThreadContext->ContextFlags = CONTEXT_CONTROL |
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CONTEXT_INTEGER |
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CONTEXT_SEGMENTS;
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/* Set up ESP to the right value */
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ThreadContext->Esp -= sizeof(PVOID);
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ZwWriteVirtualMemory(ProcessHandle,
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(PVOID)ThreadContext->Esp,
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(PVOID)&ThreadStartParam,
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sizeof(PVOID),
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NULL);
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/* Push it down one more notch for RETEIP */
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ThreadContext->Esp -= sizeof(PVOID);
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}
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/* EOF */
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