From 24f7e42cb79297347013093b1b9665e672ae29d7 Mon Sep 17 00:00:00 2001
From: rsun3 <rsun3@6f19259b-4bc3-4df7-8a09-765794883524>
Date: Tue, 17 May 2011 08:35:20 +0000
Subject: A complement fix for revision 11664 to update GCC assembly files :
 clear the direction flag in interrupt/exception handlers' assembly entry code
 before calling C functions to follow the UEFI calling convention.

Signed-off-by: rsun3
Reviewed-by:  jyao1


git-svn-id: https://edk2.svn.sourceforge.net/svnroot/edk2/trunk/edk2@11670 6f19259b-4bc3-4df7-8a09-765794883524
---
 MdeModulePkg/Universal/DebugSupportDxe/Ia32/AsmFuncs.S | 5 ++++-
 MdeModulePkg/Universal/DebugSupportDxe/X64/AsmFuncs.S  | 5 ++++-
 2 files changed, 8 insertions(+), 2 deletions(-)

(limited to 'MdeModulePkg/Universal/DebugSupportDxe')

diff --git a/MdeModulePkg/Universal/DebugSupportDxe/Ia32/AsmFuncs.S b/MdeModulePkg/Universal/DebugSupportDxe/Ia32/AsmFuncs.S
index b6108227bd..fd1a96b76f 100644
--- a/MdeModulePkg/Universal/DebugSupportDxe/Ia32/AsmFuncs.S
+++ b/MdeModulePkg/Universal/DebugSupportDxe/Ia32/AsmFuncs.S
@@ -1,7 +1,7 @@
 #/**@file
 # Low leve IA32 specific debug support functions.
 #
-# Copyright (c) 2006 - 2008, Intel Corporation. All rights reserved.<BR>
+# Copyright (c) 2006 - 2011, Intel Corporation. All rights reserved.<BR>
 # This program and the accompanying materials
 # are licensed and made available under the terms and conditions of the BSD License
 # which accompanies this distribution.  The full text of the license may be found at
@@ -276,6 +276,9 @@ ASM_PFX(CommonIdtEntry):
         # They MUST be.  If they are not, a GP fault will occur.
         fxsave (%edi)
 
+## UEFI calling convention for IA32 requires that Direction flag in EFLAGs is clear
+        cld
+                
 ## UINT32  ExceptionData;
         mov    0x0,%eax
         push   %eax
diff --git a/MdeModulePkg/Universal/DebugSupportDxe/X64/AsmFuncs.S b/MdeModulePkg/Universal/DebugSupportDxe/X64/AsmFuncs.S
index 6fb92e4350..e6a40e8dad 100644
--- a/MdeModulePkg/Universal/DebugSupportDxe/X64/AsmFuncs.S
+++ b/MdeModulePkg/Universal/DebugSupportDxe/X64/AsmFuncs.S
@@ -1,7 +1,7 @@
 ///**@file
 // Low leve x64 specific debug support functions.
 //
-// Copyright (c) 2006 - 2010, Intel Corporation. All rights reserved.<BR>
+// Copyright (c) 2006 - 2011, Intel Corporation. All rights reserved.<BR>
 // Portions copyright (c) 2008 - 2009, Apple Inc. All rights reserved.<BR>
 // This program and the accompanying materials
 // are licensed and made available under the terms and conditions of the BSD License
@@ -357,6 +357,9 @@ ExtraPushDone:
                 #     FXSTOR_RDI
                 fxsave      (%rdi)
 
+// UEFI calling convention for x64 requires that Direction flag in EFLAGs is clear
+                cld
+                
 // UINT64  ExceptionData;
                 movq    ASM_PFX(ExceptData)(%rip),  %rax
                 pushq   %rax
-- 
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