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/X64/AsmFuncs.S | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

(limited to 'MdeModulePkg/Universal/DebugSupportDxe/X64')

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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