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[RTL/x64] Improve RtlInitializeContext

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This commit is contained in:
Timo Kreuzer 2020-01-06 10:46:01 +01:00
parent 3140dac3fe
commit 3831c0ca31
1 changed files with 20 additions and 27 deletions
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47
sdk/lib/rtl/amd64/stubs.c
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@ -20,25 +20,29 @@
*/ */
VOID VOID
NTAPI NTAPI
RtlInitializeContext(IN HANDLE ProcessHandle, RtlInitializeContext(
OUT PCONTEXT ThreadContext, _Reserved_ HANDLE ProcessHandle,
IN PVOID ThreadStartParam OPTIONAL, _Out_ PCONTEXT ThreadContext,
IN PTHREAD_START_ROUTINE ThreadStartAddress, _In_ PVOID ThreadStartParam OPTIONAL,
IN PINITIAL_TEB StackBase) _In_ PTHREAD_START_ROUTINE ThreadStartAddress,
_In_ PINITIAL_TEB StackBase)
{ {
/* Initialize everything to 0 */
RtlZeroMemory(ThreadContext, sizeof(*ThreadContext));
ThreadContext->Rax = 0; /* Initialize StartAddress and Stack */
ThreadContext->Rbx = 0; ThreadContext->Rip = (ULONG64)ThreadStartAddress;
ThreadContext->Rsp = (ULONG64)StackBase - 6 * sizeof(PVOID);
/* Align stack by 16 and substract 8 (unaligned on function entry) */
ThreadContext->Rsp &= ~15;
ThreadContext->Rsp -= 8;
/* Enable Interrupts */
ThreadContext->EFlags = EFLAGS_INTERRUPT_MASK;
/* Set start parameter */
ThreadContext->Rcx = (ULONG64)ThreadStartParam; ThreadContext->Rcx = (ULONG64)ThreadStartParam;
ThreadContext->Rdx = 0;
ThreadContext->Rsi = 0;
ThreadContext->Rdi = 0;
ThreadContext->Rbp = 0;
ThreadContext->R8 = 0;
ThreadContext->R9 = 0;
ThreadContext->R10 = 0;
ThreadContext->R11 = 0;
ThreadContext->R12 = 0;
/* Set the Selectors */ /* Set the Selectors */
if ((LONG64)ThreadStartAddress < 0) if ((LONG64)ThreadStartAddress < 0)
@ -62,17 +66,6 @@ RtlInitializeContext(IN HANDLE ProcessHandle,
ThreadContext->SegSs = KGDT64_R3_DATA | RPL_MASK; ThreadContext->SegSs = KGDT64_R3_DATA | RPL_MASK;
} }
/* Enable Interrupts */
ThreadContext->EFlags = EFLAGS_INTERRUPT_MASK;
/* Settings passed */
ThreadContext->Rip = (ULONG64)ThreadStartAddress;
ThreadContext->Rsp = (ULONG64)StackBase - 6 * sizeof(PVOID);
/* Align stack by 16 and substract 8 (unaligned on function entry) */
ThreadContext->Rsp &= ~15;
ThreadContext->Rsp -= 8;
/* Only the basic Context is initialized */ /* Only the basic Context is initialized */
ThreadContext->ContextFlags = CONTEXT_CONTROL | ThreadContext->ContextFlags = CONTEXT_CONTROL |
CONTEXT_INTEGER | CONTEXT_INTEGER |