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[NTOS:KE/x64] Move setting the thread's trap frame to KiSystemCallEntry64

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This is needed, because KiSystemCallHandler can be called multiple times for the same syscall entry, which would mess up the linkage. This replaces a previous hack and makes things cleaner.
This commit is contained in:
Timo Kreuzer 2024-03-25 15:57:34 +02:00
parent fc6bf61e4c
commit 1538712c0b
2 changed files with 9 additions and 10 deletions
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15
ntoskrnl/ke/amd64/trap.S
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@ -817,6 +817,15 @@ PUBLIC KiSystemCallEntry64
stmxcsr [rsp + MAX_SYSCALL_PARAM_SIZE + KTRAP_FRAME_MxCsr]
ldmxcsr gs:[PcMxCsr]
/* Get the current thread and the trap frame */
mov rax, gs:[PcCurrentThread]
mov rcx, [rax + ThTrapFrame]
/* Save the old trap frame */
lea rdx, [rsp + MAX_SYSCALL_PARAM_SIZE]
mov [rsp + MAX_SYSCALL_PARAM_SIZE + KTRAP_FRAME_TrapFrame], rcx
mov [rax + ThTrapFrame], rdx
#if DBG
/* Check IRQL */
mov rax, cr8
@ -1077,12 +1086,6 @@ AlreadyLargeStack:
/* Disable interrupts for return */
cli
// FIXME: should just do the trap frame switch in KiSystemCallHandler64
/* Restore old trap frame */
mov rcx, gs:[PcCurrentThread]
mov rdx, [rsp + 48 + MAX_SYSCALL_PARAM_SIZE + KTRAP_FRAME_TrapFrame]
mov [rcx + KTHREAD_TrapFrame], rdx
// Restore register parameters
mov rcx, [rsp + 48 + MAX_SYSCALL_PARAM_SIZE + KTRAP_FRAME_Rip]
mov rdx, [rsp + 48 + MAX_SYSCALL_PARAM_SIZE + KTRAP_FRAME_Rdx]

4
ntoskrnl/ke/amd64/traphandler.c
View file

@ -116,10 +116,6 @@ KiSystemCallHandler(
/* Set previous mode */
Thread->PreviousMode = TrapFrame->PreviousMode = UserMode;
/* Save the old trap frame and set the new */
TrapFrame->TrapFrame = (ULONG64)Thread->TrapFrame;
Thread->TrapFrame = TrapFrame;
/* We don't have an exception frame yet */
TrapFrame->ExceptionFrame = 0;