[ion] 23849: - Some cleanups - Add support for recovering from user-mode win32k callback fault. - Also add support for debug register saving/reloading during user-mode callbacks and return.
31 Aug
2006
31 Aug
'06
6:10 p.m.
Author: ion
Date: Thu Aug 31 22:10:11 2006
New Revision: 23849
URL: http://svn.reactos.org/svn/reactos?rev=23849&view=rev
Log:
- Some cleanups
- Add support for recovering from user-mode win32k callback fault.
- Also add support for debug register saving/reloading during user-mode callbacks and
return.
Modified:
trunk/reactos/include/ndk/asm.h
trunk/reactos/lib/rtl/i386/debug_asm.S
trunk/reactos/ntoskrnl/ke/i386/cpu.S
trunk/reactos/ntoskrnl/ke/i386/trap.s
trunk/reactos/ntoskrnl/ke/i386/usercall_asm.S
Modified: trunk/reactos/include/ndk/asm.h
URL:
http://svn.reactos.org/svn/reactos/trunk/reactos/include/ndk/asm.h?rev=2384…
==============================================================================
--- trunk/reactos/include/ndk/asm.h (original)
+++ trunk/reactos/include/ndk/asm.h Thu Aug 31 22:10:11 2006
@@ -430,6 +430,7 @@
#define STATUS_ACCESS_VIOLATION 0xC0000005
#define STATUS_INVALID_SYSTEM_SERVICE 0xC000001C
#define STATUS_NO_CALLBACK_ACTIVE 0xC0000258
+#define STATUS_CALLBACK_POP_STACK 0xC0000423
#define STATUS_ARRAY_BOUNDS_EXCEEDED 0xC000008C
#define STATUS_ILLEGAL_INSTRUCTION 0xC000001D
#define STATUS_BREAKPOINT 0x80000003
Modified: trunk/reactos/lib/rtl/i386/debug_asm.S
URL:
http://svn.reactos.org/svn/reactos/trunk/reactos/lib/rtl/i386/debug_asm.S?r…
==============================================================================
--- trunk/reactos/lib/rtl/i386/debug_asm.S (original)
+++ trunk/reactos/lib/rtl/i386/debug_asm.S Thu Aug 31 22:10:11 2006
@@ -10,23 +10,35 @@
/* GLOBALS ****************************************************************/
-.globl _DbgBreakPoint@0
-.globl _DbgBreakPointWithStatus@4
-.globl _DbgUserBreakPoint@0
-.globl _DebugService@20
+.globl _DbgBreakPoint@0
+.globl _DbgBreakPointWithStatus@4
+.globl _DbgUserBreakPoint@0
+.globl _DebugService@20
+.globl _DbgBreakPointNoBugCheck@0
/* FUNCTIONS ***************************************************************/
+.func DbgBreakPointNoBugCheck@0
+_DbgBreakPointNoBugCheck@0:
+ int 3
+ ret
+.endfunc
+
+.func DbgBreakPoint@0
_DbgBreakPoint@0:
_DbgUserBreakPoint@0:
int 3
ret
-
+.endfunc
+
+.func DbgBreakPointWithStatus@4
_DbgBreakPointWithStatus@4:
mov eax, [esp+4]
int 3
ret 4
+.endfunc
+.func DebugService@20
_DebugService@20:
/* Setup the stack */
@@ -58,4 +70,4 @@
/* Return */
leave
ret 20
-
+.endfunc
Modified: trunk/reactos/ntoskrnl/ke/i386/cpu.S
URL:
http://svn.reactos.org/svn/reactos/trunk/reactos/ntoskrnl/ke/i386/cpu.S?rev…
==============================================================================
--- trunk/reactos/ntoskrnl/ke/i386/cpu.S (original)
+++ trunk/reactos/ntoskrnl/ke/i386/cpu.S Thu Aug 31 22:10:11 2006
@@ -11,30 +11,19 @@
#include <asm.h>
.intel_syntax noprefix
-/* GLOBALS ****************************************************************/
-
-
/* FUNCTIONS ****************************************************************/
-
-.global _DbgBreakPointNoBugCheck@0
-.func DbgBreakPointNoBugCheck@0
-_DbgBreakPointNoBugCheck@0:
- int 3
- ret
-.endfunc
.globl _KeFlushCurrentTb@0
.func KeFlushCurrentTb@0
_KeFlushCurrentTb@0:
+
/* Check for global page support */
test byte ptr [_Ke386GlobalPagesEnabled], 0xff
jz .L1
/* Modifying the PSE, PGE or PAE Flag in CR4 causes the TLB to be flushed */
mov eax, cr4
-.att_syntax /* Older binutils versions don't support ~ for .intel_syntax */
- and $~CR4_PGE, %eax
-.intel_syntax noprefix
+ and eax, ~CR4_PGE
mov cr4, eax
or eax, CR4_PGE
mov cr4, eax
@@ -47,25 +36,4 @@
ret
.endfunc
-.globl _KiCoprocessorError@0
-.func KiCoprocessorError@0
-_KiCoprocessorError@0:
- /* Get the NPX Thread's Initial stack */
- mov eax, [fs:KPCR_NPX_THREAD]
- mov eax, [eax+KTHREAD_INITIAL_STACK]
-
- /* Make space for the FPU Save area */
- sub eax, SIZEOF_FX_SAVE_AREA
-
- /* Set the CR0 State */
- mov dword ptr [eax+FN_CR0_NPX_STATE], 8
-
- /* Update it */
- mov eax, cr0
- or eax, 8
- mov cr0, eax
-
- /* Return to caller */
- ret
-.endfunc
Modified: trunk/reactos/ntoskrnl/ke/i386/trap.s
URL:
http://svn.reactos.org/svn/reactos/trunk/reactos/ntoskrnl/ke/i386/trap.s?re…
==============================================================================
--- trunk/reactos/ntoskrnl/ke/i386/trap.s (original)
+++ trunk/reactos/ntoskrnl/ke/i386/trap.s Thu Aug 31 22:10:11 2006
@@ -55,6 +55,7 @@
/* And special system-defined software traps: */
.globl _NtRaiseException@12
.globl _NtContinue@8
+.globl _KiCoprocessorError@0
/* Interrupt template entrypoints */
.globl _KiInterruptTemplate
@@ -1472,6 +1473,28 @@
ret
.endfunc
+.func KiCoprocessorError@0
+_KiCoprocessorError@0:
+
+ /* Get the NPX Thread's Initial stack */
+ mov eax, [fs:KPCR_NPX_THREAD]
+ mov eax, [eax+KTHREAD_INITIAL_STACK]
+
+ /* Make space for the FPU Save area */
+ sub eax, SIZEOF_FX_SAVE_AREA
+
+ /* Set the CR0 State */
+ mov dword ptr [eax+FN_CR0_NPX_STATE], 8
+
+ /* Update it */
+ mov eax, cr0
+ or eax, 8
+ mov cr0, eax
+
+ /* Return to caller */
+ ret
+.endfunc
+
/* UNEXPECTED INTERRUPT HANDLERS **********************************************/
.globl _KiStartUnexpectedRange@0
Modified: trunk/reactos/ntoskrnl/ke/i386/usercall_asm.S
URL:
http://svn.reactos.org/svn/reactos/trunk/reactos/ntoskrnl/ke/i386/usercall_…
==============================================================================
--- trunk/reactos/ntoskrnl/ke/i386/usercall_asm.S (original)
+++ trunk/reactos/ntoskrnl/ke/i386/usercall_asm.S Thu Aug 31 22:10:11 2006
@@ -127,9 +127,7 @@
mov [ebx+KTHREAD_CALLBACK_STACK], esp
/* Align stack on 16-byte boundary */
-.att_syntax /* Older binutils versions don't support ~ for intel_syntax */
- and $~15,%esp
-.intel_syntax noprefix
+ and esp, ~15
mov edi, esp
/* Set destination and origin NPX Areas */
@@ -178,13 +176,16 @@
lea esi, [edx+KTRAP_FRAME_FS]
rep movsd
- /* VMWARE Hack because ES/DS sometimes gets smashed when returning to User-Mode.
Investigate! */
- mov dword ptr [esp+KTRAP_FRAME_DS], KGDT_R3_DATA + RPL_MASK
- mov dword ptr [esp+KTRAP_FRAME_ES], KGDT_R3_DATA + RPL_MASK
-
- /* FIXME: Copy debug registers if needed */
+ /* Copy DR7 */
+ mov edi, [edx+KTRAP_FRAME_DR7]
+ test edi, ~DR7_RESERVED_MASK
+ mov [esp+KTRAP_FRAME_DR7], edi
+
+ /* Check if we need to save debug registers */
+ jnz SaveDebug
/* Get user-mode dispatcher address and set it as EIP */
+SetEip:
mov eax, _KeUserCallbackDispatcher
mov [esp+KTRAP_FRAME_EIP], eax
@@ -204,6 +205,15 @@
/* Exit to user-mode */
jmp _KiServiceExit
+
+SaveDebug:
+
+ /* Copy all 5 DRs */
+ mov ecx, 5
+ lea edi, [esp+KTRAP_FRAME_DR0]
+ lea esi, [edx+KTRAP_FRAME_DR0]
+ rep movsd
+ jmp SetEip
GrowFailed:
/* Restore registers */
@@ -294,11 +304,19 @@
mov edx, [esi+FN_CR0_NPX_STATE]
mov [ebx+FN_CR0_NPX_STATE], edx
- /* Get saved trap frame and clear DR7 */
+ /* Check if we failed in user mode */
+ cmp ebp, STATUS_CALLBACK_POP_STACK
mov edi, [ecx+CBSTACK_TRAP_FRAME]
+ jz UserFault
+
+CheckDebug:
+
+ /* Clear DR7 */
and dword ptr [edi+KTRAP_FRAME_DR7], 0
- /* FIXME: Restore debug regs */
+ /* Check if debugging was active */
+ test byte ptr [eax+KTHREAD_DEBUG_ACTIVE], 0xFF
+ jnz RestoreDebug
/* Get TSS */
mov edx, fs:[KPCR_TSS]
@@ -336,12 +354,41 @@
add esp, 8
jmp edx
+UserFault:
+ /* Set size to copy */
+ mov ecx, (KTRAP_FRAME_V86_ES - KTRAP_FRAME_FS) / 4
+
+ /* Check if this was V86 mode */
+ mov esi, [eax+KTHREAD_TRAP_FRAME]
+ test dword ptr [esi+KTRAP_FRAME_EFLAGS], EFLAGS_V86_MASK
+
+ /* Save EDI and load destination */
+ mov edx, edi
+ lea edi, [edi+KTRAP_FRAME_FS]
+ jz NotV86
+ add ecx, 16 / 4
+
+NotV86:
+ /* Set source and copy */
+ lea esi, [esi+KTRAP_FRAME_FS]
+ rep movsd
+
+ /* Restore ECX and ECX */
+ mov ecx, [eax+KTHREAD_CALLBACK_STACK]
+ mov edi, edx
+ jmp CheckDebug
+
+RestoreDebug:
+
+ /* Not yet supported */
+ int 3
+ jmp $
+
NoStack:
/* Return failure */
mov eax, STATUS_NO_CALLBACK_ACTIVE
ret 12
-
.endfunc
/*++
@@ -450,5 +497,4 @@
pop edi
pop esi
ret 8
-
.endfunc
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