* PROJECT: ReactOS kernel
* FILE: ntoskrnl/ke/amd64/ctxswitch.S
* PURPOSE: Thread Context Switching
- *
+ *
* PROGRAMMER: Timo kreuzer (timo.kreuzer@reactos.org)
*/
/* INCLUDES ******************************************************************/
-#include <asm.inc>
#include <ksamd64.inc>
+#include <trapamd64.inc>
+
+/*
+ * BOOLEAN
+ * KiSwapContextResume(
+ * _In_ KIRQL WaitIrql,
+ * _In_ PKTHREAD OldThread,
+ * _In_ PKTHREAD NewThread)
+ */
+EXTERN KiSwapContextResume:PROC
/* FUNCTIONS ****************************************************************/
.code64
-/*++
- * KiThreadStartup
+/*!
+ * \name KiThreadStartup
*
+ * \brief
* The KiThreadStartup routine is the beginning of any thread.
*
- * Params:
- * SystemRoutine - Pointer to the System Startup Routine. Either
- * PspUserThreadStartup or PspSystemThreadStartup
+ * VOID
+ * KiThreadStartup(
+ * IN PKSTART_ROUTINE StartRoutine<rcx>,
+ * IN PVOID StartContext<rdx>,
+ * IN PVOID P3<r8>,
+ * IN PVOID P4<r9>,
+ * IN PVOID SystemRoutine);
*
- * StartRoutine - For Kernel Threads only, specifies the starting execution
- * point of the new thread.
+ * \param StartRoutine
+ * For Kernel Threads only, specifies the starting execution point
+ * of the new thread.
*
- * StartContext - For Kernel Threads only, specifies a pointer to variable
- * context data to be sent to the StartRoutine above.
+ * \param StartContext
+ * For Kernel Threads only, specifies a pointer to variable
+ * context data to be sent to the StartRoutine above.
*
- * UserThread - Indicates whether or not this is a user thread. This tells
- * us if the thread has a context or not.
+ * \param P3, P4 - not used atm
*
- * TrapFrame - Pointer to the KTHREAD to which the caller wishes to
- * switch from.
+ * \param SystemRoutine
+ * Pointer to the System Startup Routine.
+ * Either PspUserThreadStartup or PspSystemThreadStartup
*
- * Returns:
+ * \return
* Should never return for a system thread. Returns through the System Call
* Exit Dispatcher for a user thread.
*
- * Remarks:
+ * \remarks
* If a return from a system thread is detected, a bug check will occur.
*
*--*/
PUBLIC KiThreadStartup
-KiThreadStartup:
-
- /*
- * Clear all the non-volatile registers, so the thread won't be tempted to
- * expect any static data (like some badly coded usermode/win9x apps do)
+.PROC KiThreadStartup
+ /* KSTART_FRAME is already on the stack when we enter here.
+ * The virtual prolog looks like this:
+ * sub rsp, 5 * 8
+ * mov [rsp + SfP1Home], rcx
+ * mov [rsp + SfP2Home], rdx
+ * mov [rsp + SfP3Home], r8
+ * mov [rsp + SfP4Home], r9
*/
+ .allocstack (5 * 8)
+ .endprolog
+
+ /* Clear all the non-volatile registers, so the thread won't be tempted to
+ * expect any static data (like some badly coded usermode/win9x apps do) */
xor rbx, rbx
xor rsi, rsi
xor rdi, rdi
mov rax, APC_LEVEL
mov cr8, rax
- /*
- * Call the System Routine which is right on our stack now.
- * After we pop the pointer, the Start Routine/Context is on the
- * stack, we pop it as parameters to the System Routine into rcx
- */
- pop rax
- pop rcx
- call rax
-
- /* The thread returned... was it a user-thread? */
- pop rcx
- or rcx, rcx
- jz BadThread
-
- /* Yes it was, set our trapframe for the System Call Exit Dispatcher */
- mov ebp, esp
-
- /* Exit back to user-mode */
-// jmp _KiServiceExit2
-UNIMPLEMENTED KiThreadStartup_KiServiceExit2
-
-BadThread:
-
- /* A system thread returned...this is very bad! */
- int 3
+ /* We have the KSTART_FRAME on the stack, P1Home and P2Home are preloaded
+ * with the parameters for the system routine. The address of the system
+ * routine is stored in P4Home. */
+ mov rcx, [rsp + SfP1Home] /* StartRoutine */
+ mov rdx, [rsp + SfP2Home] /* StartContext */
+ mov r8, [rsp + SfP3Home] /* ? */
+ call qword ptr [rsp + SfP4Home] /* SystemRoutine */
+ /* Return to the exit code */
+ add rsp, 5 * 8
+ ret
+.ENDP
+
+PUBLIC KiInvalidSystemThreadStartupExit
+.PROC KiInvalidSystemThreadStartupExit
+ .endprolog
+
+ /* This is invalid! */
+ int HEX(2C)
+ nop
+.ENDP
+
+PUBLIC KiUserThreadStartupExit
+.PROC KiUserThreadStartupExit
+ .allocstack (KEXCEPTION_FRAME_LENGTH - 8)
+ .savereg rbp, ExRbp
+ .savereg rbx, ExRbx
+ .savereg rdi, ExRdi
+ .savereg rsi, ExRsi
+ .savereg r12, ExR12
+ .savereg r13, ExR13
+ .savereg r14, ExR14
+ .savereg r15, ExR15
+ .savexmm128 xmm6, ExXmm6
+ .savexmm128 xmm7, ExXmm7
+ .savexmm128 xmm8, ExXmm8
+ .savexmm128 xmm9, ExXmm9
+ .savexmm128 xmm10, ExXmm10
+ .savexmm128 xmm11, ExXmm11
+ .savexmm128 xmm12, ExXmm12
+ .savexmm128 xmm13, ExXmm13
+ .savexmm128 xmm14, ExXmm14
+ .savexmm128 xmm15, ExXmm15
+ .endprolog
+
+ /* Restore the exception frame */
+ RESTORE_EXCEPTION_STATE
+
+ /* Point rcx to the trap frame */
+ lea rcx, [rsp + 8]
+
+ /* Return to the trap exit code */
+ ret
+.ENDP
-/*++
- * KiSwapContextInternal
+/*!
+ * \name KiSwapContextInternal
*
+ * \brief
* The KiSwapContextInternal routine switches context to another thread.
*
- * Params:
- * ESI - Pointer to the KTHREAD to which the caller wishes to
- * switch to.
- * EDI - Pointer to the KTHREAD to which the caller wishes to
- * switch from.
+ * \param cl
+ * The IRQL at wich the old thread is suspended
+ *
+ * \param rdx
+ * Pointer to the KTHREAD to which the caller wishes to switch from.
+ *
+ * \param r8
+ * Pointer to the KTHREAD to which the caller wishes to switch to.
*
- * Returns:
- * None.
+ * \return
+ * The WaitStatus of the Target Thread.
*
- * Remarks:
- * Absolutely all registers except ESP can be trampled here for maximum code flexibility.
+ * \remarks
+ * ...
*
*--*/
-PUBLIC KiSwapContextInternal
-KiSwapContextInternal:
- UNIMPLEMENTED KiSwapContextInternal
+.PROC KiSwapContextInternal
+
+ push rbp
+ .pushreg rbp
+ sub rsp, 6 * 8
+ .allocstack (6 * 8)
+ .endprolog
+
+ /* Wait for SwapBusy */
+.SwapBusySet:
+ cmp byte ptr [r8 + ThSwapBusy], 0
+ je .SwapBusyClear
+ pause
+ jmp .SwapBusySet
+.SwapBusyClear:
+
+ /* Save WaitIrql as KSWITCH_FRAME::ApcBypass */
+ mov [rsp + SwApcBypass], cl
+
+ /* Save kernel stack of old thread */
+ mov [rdx + KTHREAD_KernelStack], rsp
+
+ /* Load stack of new thread */
+ mov rsp, [r8 + KTHREAD_KernelStack]
+
+ /* Reload APC bypass */
+ mov cl, [rsp + SwApcBypass]
+
+ call KiSwapContextResume
+
+ /* Cleanup and return */
+ add rsp, 6 * 8
+ pop rbp
ret
+.ENDP
+
-/**
+
+/*!
* KiSwapContext
*
* \brief
* The KiSwapContext routine switches context to another thread.
*
* BOOLEAN
- * KiSwapContext(PKTHREAD CurrentThread, PKTHREAD TargetThread);
+ * KiSwapContext(KIRQL WaitIrql, PKTHREAD OldThread);
*
- * \param CurrentThread
- * Pointer to the KTHREAD of the current thread.
- *
- * \param TargetThread
- * Pointer to the KTHREAD to which the caller wishes to switch to.
+ * \param WaitIrql <cl>
+ * The IRQL at wich the old thread is suspended
+ *
+ * \param OldThread <rdx>
+ * Pointer to the KTHREAD of the previous thread.
*
- * \returns
+ * \return
* The WaitStatus of the Target Thread.
*
* \remarks
* non-volatile registers so that the Internal function can use all of
* them. It will also save the old current thread and set the new one.
*
- * The calling thread does not return after KiSwapContextInternal until
+ * The calling thread does not return after KiSwapContextInternal until
* another thread switches to IT.
*
*--*/
PUBLIC KiSwapContext
-KiSwapContext:
-
- /* Save 10 registers */
- sub rsp, 10 * 8
-
- /* Save all the non-volatile ones */
- mov [rsp+72], r15
- mov [rsp+64], r14
- mov [rsp+56], r13
- mov [rsp+48], r12
- mov [rsp+40], r11
- mov [rsp+32], r10
+.PROC KiSwapContext
- mov [rsp+24], rbx
- mov [rsp+16], rsi
- mov [rsp+8], rdi
- mov [rsp+0], rbp
-
- /* Get the PCR */
- mov rbx, gs:[PcSelf]
-
- /* Get the current thread */
- mov rdi, rcx
-
- /* Get the New Thread */
- mov rsi, rdx
-
- /* Get the wait IRQL */
- movzx ecx, byte ptr [edi+KTHREAD_WAIT_IRQL]
+ /* Generate a KEXCEPTION_FRAME on the stack */
+ GENERATE_EXCEPTION_FRAME
/* Do the swap with the registers correctly setup */
+ mov r8, gs:[PcCurrentThread] /* Pointer to the new thread */
call KiSwapContextInternal
- /* Restore the registers */
- mov rbp, [rsp+0]
- mov rdi, [rsp+8]
- mov rsi, [rsp+16]
- mov rbx, [rsp+24]
-
- mov r10, [rsp+32]
- mov r11, [rsp+40]
- mov r12, [rsp+48]
- mov r13, [rsp+56]
- mov r14, [rsp+64]
- mov r15, [rsp+72]
-
- /* Clean stack */
- add esp, 10 * 8
+ /* Restore the registers from the KEXCEPTION_FRAME */
+ RESTORE_EXCEPTION_STATE
+
+ /* Return */
ret
+.ENDP
END
projects / reactos.git / blobdiff