[NTOSKRNL]

Fix KiConvertToGuiThread on MSVC builds, by using a raw assembly function instead of a (broken) inline asembly function
MSVC built kernel boots further now.

svn path=/trunk/; revision=52509

reactos/ntoskrnl/include/internal/i386/ke.h

@@ -707,6 +707,7 @@ KiCheckForApcDelivery(IN PKTRAP_FRAME TrapFrame)
 //
 // Converts a base thread to a GUI thread
 //
+#ifdef __GNUC__
 NTSTATUS
 FORCEINLINE
 KiConvertToGuiThread(VOID)
@@ -730,7 +731,6 @@ KiConvertToGuiThread(VOID)
      * on its merry way.
      *
      */
-#ifdef __GNUC__
     __asm__ __volatile__
     (
         "movl %%ebp, %1\n"
@@ -743,22 +743,15 @@ KiConvertToGuiThread(VOID)
         :
         : "%esp", "%ecx", "%edx", "memory"
     );
+    return Result;
+}
 #elif defined(_MSC_VER)
-    NTSTATUS NTAPI PsConvertToGuiThread(VOID);
-    __asm
-    {
-        mov StackFrame, ebp
-        sub StackFrame, esp
-        call PsConvertToGuiThread
-        add StackFrame, esp
-        mov ebp, StackFrame
-        mov Result, eax
-    }
+NTSTATUS
+NTAPI
+KiConvertToGuiThread(VOID);
 #else
 #error Unknown Compiler
 #endif
-    return Result;
-}
 
 //
 // Switches from boot loader to initial kernel stack

reactos/ntoskrnl/ke/i386/trap.s

@@ -156,4 +156,24 @@ KiTrapExitStub KiEditedTrapReturn,        (KI_RESTORE_VOLATILES OR KI_RESTORE_EF
 KiTrapExitStub KiTrapReturn,              (KI_RESTORE_VOLATILES OR KI_RESTORE_SEGMENTS OR KI_EXIT_IRET)
 KiTrapExitStub KiTrapReturnNoSegments,    (KI_RESTORE_VOLATILES OR KI_EXIT_IRET)
 
+#ifdef _MSC_VER
+EXTERN _PsConvertToGuiThread@0:PROC
+
+PUBLIC _KiConvertToGuiThread@0
+_KiConvertToGuiThread@0:
+    /* Calculate the stack frame offset in ebx */
+    mov ebx, ebp
+    sub ebx, esp
+
+    /* Call the worker function */
+    call _PsConvertToGuiThread@0
+
+    /* Adjust ebp to the new stack */
+    mov ebp, esp
+    add ebp, ebx
+
+    /* return to the caller */
+    ret
+#endif
+
 END