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[NTOS:KE/x64][SDK] Add HANDLE_USER_APCS asm macro

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This also fixes delivering APCs from the system call handler, which previously would have clobbered rax. Also don't use the thread's TrapFrame member, which is not always set, when returning.
This commit is contained in:
Timo Kreuzer 2024-03-27 23:17:29 +02:00
parent 88e24bc463
commit 24b4026ce8
2 changed files with 33 additions and 13 deletions
Download patch file Download diff file Expand all files Collapse all files

26
ntoskrnl/ke/amd64/trap.S
View file

@ -850,12 +850,9 @@ GLOBAL_LABEL KiSystemServiceExit
ASSERT_TRAP_FRAME_INTS_ENABLED rsp + MAX_SYSCALL_PARAM_SIZE ASSERT_TRAP_FRAME_INTS_ENABLED rsp + MAX_SYSCALL_PARAM_SIZE
/* Check for pending user APC */ /* Check for pending user APCs */
mov rcx, gs:qword ptr [PcCurrentThread] mov rcx, gs:[PcCurrentThread]
cmp byte ptr [rcx + ThApcState + AsUserApcPending], 0 HANDLE_USER_APCS rcx, rsp + MAX_SYSCALL_PARAM_SIZE
jz no_user_apc_pending
call KiInitiateUserApc
no_user_apc_pending:
/* Disable interrupts for return */ /* Disable interrupts for return */
cli cli
@ -1137,12 +1134,23 @@ PUBLIC KiSetTrapContext
*/ */
EXTERN KiDeliverApc:PROC EXTERN KiDeliverApc:PROC
/*
* VOID
* KiInitiateUserApc(
* _In_ PKTRAP_FRAME TrapFrame@<rcx>);
*
* This function is called to deliver user mode APCs.
* It clobbers all non-volatile registers, except rax.
*/
PUBLIC KiInitiateUserApc PUBLIC KiInitiateUserApc
.PROC KiInitiateUserApc .PROC KiInitiateUserApc
/* Generate a KEXCEPTION_FRAME on the stack */ /* Generate a KEXCEPTION_FRAME on the stack */
GENERATE_EXCEPTION_FRAME GENERATE_EXCEPTION_FRAME
/* Save rax to not clobber the return for the system call handler */
mov [rsp + ExP1Home], rax
/* Raise IRQL to APC_LEVEL */ /* Raise IRQL to APC_LEVEL */
mov rax, APC_LEVEL mov rax, APC_LEVEL
mov cr8, rax mov cr8, rax
@ -1150,6 +1158,9 @@ PUBLIC KiInitiateUserApc
/* Get the current thread */ /* Get the current thread */
mov rbp, gs:[PcCurrentThread] mov rbp, gs:[PcCurrentThread]
/* Save the trap frame in rsi */
mov rsi, rcx
deliver_apcs: deliver_apcs:
/* Enable interrupts */ /* Enable interrupts */
@ -1158,7 +1169,7 @@ deliver_apcs:
/* Call the C function */ /* Call the C function */
mov ecx, 1 mov ecx, 1
mov rdx, rsp mov rdx, rsp
mov r8, [rbp + ThTrapFrame] mov r8, rsi
call KiDeliverApc call KiDeliverApc
/* Disable interrupts again */ /* Disable interrupts again */
@ -1173,6 +1184,7 @@ deliver_apcs:
mov cr8, rax mov cr8, rax
/* Restore the registers from the KEXCEPTION_FRAME */ /* Restore the registers from the KEXCEPTION_FRAME */
mov rax, [rsp + ExP1Home]
RESTORE_EXCEPTION_STATE RESTORE_EXCEPTION_STATE
/* Return */ /* Return */

20
sdk/include/asm/trapamd64.inc
View file

@ -37,6 +37,19 @@ IrqlIsPassive:
#endif #endif
ENDM ENDM
// Checks for user APCs and delivers them if necessary.
// Clobbers all volatile registers except rax.
MACRO(HANDLE_USER_APCS, ThreadReg, TrapFrame)
LOCAL NoUserApcPending
/* Check for pending user APC */
cmp byte ptr [ThreadReg + ThApcState + AsUserApcPending], 0
jz NoUserApcPending
lea rcx, [TrapFrame]
call KiInitiateUserApc
NoUserApcPending:
ENDM
APIC_EOI = HEX(0FFFFFFFFFFFE00B0) APIC_EOI = HEX(0FFFFFFFFFFFE00B0)
TF_VOLATILES = HEX(01) TF_VOLATILES = HEX(01)
@ -195,7 +208,6 @@ ENDM
*/ */
MACRO(ExitTrap, Flags) MACRO(ExitTrap, Flags)
LOCAL kernel_mode_return LOCAL kernel_mode_return
LOCAL NoUserApc
ASSERT_TRAP_FRAME_IRQL_VALID rbp ASSERT_TRAP_FRAME_IRQL_VALID rbp
@ -217,12 +229,8 @@ MACRO(ExitTrap, Flags)
jz kernel_mode_return jz kernel_mode_return
if (Flags AND TF_CHECKUSERAPC) if (Flags AND TF_CHECKUSERAPC)
/* Load current thread into r10 */
mov r10, gs:[PcCurrentThread] mov r10, gs:[PcCurrentThread]
cmp byte ptr [r10 + KTHREAD_UserApcPending], 0 HANDLE_USER_APCS r10, rbp
je NoUserApc
call KiInitiateUserApc
NoUserApc:
endif endif
ASSERT_TRAP_FRAME_INTS_ENABLED rbp ASSERT_TRAP_FRAME_INTS_ENABLED rbp