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Implement KiServiceExit2 which restores debug registers and exits with IRET, used during user-mode return without a syscall

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svn path=/trunk/; revision=14758
This commit is contained in:
Alex Ionescu
2005-04-23 05:00:10 +00:00
parent e43b4d5c1a
commit 98f1613a52
2 changed files with 81 additions and 1 deletions
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reactos/ntoskrnl/ke/i386/ctxswitch.S
+1 -1
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@@ -88,7 +88,7 @@ _KiThreadStartup@156:
mov ebp, esp
/* Exit back to user-mode */
jmp _KiServiceExit
jmp _KiServiceExit2
BadThread:
reactos/ntoskrnl/ke/i386/syscall.S
+80
View File
@@ -22,6 +22,7 @@
.globl KeReturnFromSystemCallWithHook
.globl _KiServiceExit
.globl _KiServiceExit2
.globl _KiFastCallEntry
.globl _KiSystemService
@@ -317,3 +318,82 @@ InvalidCall:
movl $STATUS_INVALID_SYSTEM_SERVICE, %eax
movl %eax, KTRAP_FRAME_EAX(%ebp)
jmp _KiServiceExit
_KiServiceExit2:
/* Get the Current Thread */
cli
movl %fs:KPCR_CURRENT_THREAD, %esi
/* Deliver APCs only if we were called from user mode */
testb $1, KTRAP_FRAME_CS(%esp)
je KiRosTrapReturn
/* And only if any are actually pending */
cmpb $0, KTHREAD_PENDING_USER_APC(%esi)
je KiRosTrapReturn
/* Save pointer to Trap Frame */
movl %esp, %ebx
/* Raise IRQL to APC_LEVEL */
movl $1, %ecx
call @KfRaiseIrql@4
/* Save old IRQL */
pushl %eax
/* Deliver APCs */
sti
pushl %ebx
pushl $0
pushl $UserMode
call _KiDeliverApc@12
cli
/* Return to old IRQL */
popl %ecx
call @KfLowerIrql@4
/* Skip useless Debug Data */
addl $0x18, %esp // + 0x74
/* Restore Debug Registers */
popl %eax // + 0x5C
movl %eax, %dr0
popl %eax // + 0x58
movl %eax, %dr1
popl %eax // + 0x54
movl %eax, %dr2
popl %eax // + 0x50
movl %eax, %dr3
popl %eax // + 0x4C
movl %eax, %dr6
popl %eax // + 0x48
movl %eax, %dr7
/* Restore Registers */
popl %gs // + 0x44
popl %es // + 0x40
popl %ds // + 0x3C
popl %edx // + 0x38
popl %ecx // + 0x34
popl %eax // + 0x30
/* Restore the old previous mode */
popl %ebx // + 0x2C
movb %bl, %ss:KTHREAD_PREVIOUS_MODE(%esi)
/* Restore the old exception handler list */
popl %fs:KPCR_EXCEPTION_LIST // + 0x28
/* Restore final registers from trap frame */
popl %fs // + 0x24
popl %edi // + 0x20
popl %esi // + 0x1C
popl %ebx // + 0x18
popl %ebp // + 0x14
add $4, %esp // + 0x10
/* Return to user-mode */
iret