[fireball] 33597: - Implement restoring DRx registers if the thread is being debugged.

Author: fireball
Date: Mon May 19 05:04:21 2008
New Revision: 33597

URL: http://svn.reactos.org/svn/reactos?rev=33597&view=rev
Log:
- Implement restoring DRx registers if the thread is being debugged.

Modified:
    trunk/reactos/ntoskrnl/ke/i386/usercall_asm.S

Modified: trunk/reactos/ntoskrnl/ke/i386/usercall_asm.S
URL: http://svn.reactos.org/svn/reactos/trunk/reactos/ntoskrnl/ke/i386/usercall_a...
==============================================================================
--- trunk/reactos/ntoskrnl/ke/i386/usercall_asm.S [iso-8859-1] (original)
+++ trunk/reactos/ntoskrnl/ke/i386/usercall_asm.S [iso-8859-1] Mon May 19 05:04:21 2008
@@ -318,6 +318,8 @@
     test byte ptr [eax+KTHREAD_DEBUG_ACTIVE], 0xFF
     jnz RestoreDebug

+RestoreStack:
+
     /* Get TSS */
     mov edx, fs:[KPCR_TSS]

@@ -379,10 +381,25 @@
     jmp CheckDebug

RestoreDebug:
-
-    /* Not yet supported */
-    int 3
-    jmp $
+    /* Get a pointer to thread's trap frame */
+    mov esi, [eax+KTHREAD_TRAP_FRAME]
+
+    /* Copy debug registers data from it */
+    mov edx, [esi+KTRAP_FRAME_DR0]
+    mov [edi+KTRAP_FRAME_DR0], edx
+    mov edx, [esi+KTRAP_FRAME_DR1]
+    mov [edi+KTRAP_FRAME_DR1], edx
+    mov edx, [esi+KTRAP_FRAME_DR2]
+    mov [edi+KTRAP_FRAME_DR2], edx
+    mov edx, [esi+KTRAP_FRAME_DR3]
+    mov [edi+KTRAP_FRAME_DR3], edx
+    mov edx, [esi+KTRAP_FRAME_DR6]
+    mov [edi+KTRAP_FRAME_DR6], edx
+    mov edx, [esi+KTRAP_FRAME_DR7]
+    mov [edi+KTRAP_FRAME_DR7], edx
+
+    /* Jump back */
+    jmp RestoreStack

NoStack: