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authorrsun3 <rsun3@6f19259b-4bc3-4df7-8a09-765794883524>2011-05-16 06:10:42 +0000
committerrsun3 <rsun3@6f19259b-4bc3-4df7-8a09-765794883524>2011-05-16 06:10:42 +0000
commitad8cbf7197f41cbca4ac101d58f72dcf05c13860 (patch)
tree1207a737bf7cdf0a396db9044269ed8d2c45485f /UefiCpuPkg/CpuDxe/X64
parente332b442b9d22b948956a681b0614708303c5976 (diff)
downloadedk2-platforms-ad8cbf7197f41cbca4ac101d58f72dcf05c13860.tar.xz
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@11664 6f19259b-4bc3-4df7-8a09-765794883524
Diffstat (limited to 'UefiCpuPkg/CpuDxe/X64')
-rw-r--r--UefiCpuPkg/CpuDxe/X64/CpuAsm.asm5
1 files changed, 4 insertions, 1 deletions
diff --git a/UefiCpuPkg/CpuDxe/X64/CpuAsm.asm b/UefiCpuPkg/CpuDxe/X64/CpuAsm.asm
index 79edb7b83e..68fcd3f404 100644
--- a/UefiCpuPkg/CpuDxe/X64/CpuAsm.asm
+++ b/UefiCpuPkg/CpuDxe/X64/CpuAsm.asm
@@ -1,7 +1,7 @@
TITLE CpuAsm.asm:
;------------------------------------------------------------------------------
;*
-;* Copyright (c) 2008 - 2010, Intel Corporation. All rights reserved.<BR>
+;* Copyright (c) 2008 - 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
@@ -223,6 +223,9 @@ NoErrorCode:
mov rdi, rsp
db 0fh, 0aeh, 07h ;fxsave [rdi]
+;; UEFI calling convention for x64 requires that Direction flag in EFLAGs is clear
+ cld
+
;; UINT32 ExceptionData;
push qword ptr [rbp + 16]