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author | rsun3 <rsun3@6f19259b-4bc3-4df7-8a09-765794883524> | 2011-05-16 06:10:42 +0000 |
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committer | rsun3 <rsun3@6f19259b-4bc3-4df7-8a09-765794883524> | 2011-05-16 06:10:42 +0000 |
commit | ad8cbf7197f41cbca4ac101d58f72dcf05c13860 (patch) | |
tree | 1207a737bf7cdf0a396db9044269ed8d2c45485f /UefiCpuPkg/CpuDxe/Ia32/CpuAsm.asm | |
parent | e332b442b9d22b948956a681b0614708303c5976 (diff) | |
download | edk2-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/Ia32/CpuAsm.asm')
-rw-r--r-- | UefiCpuPkg/CpuDxe/Ia32/CpuAsm.asm | 5 |
1 files changed, 4 insertions, 1 deletions
diff --git a/UefiCpuPkg/CpuDxe/Ia32/CpuAsm.asm b/UefiCpuPkg/CpuDxe/Ia32/CpuAsm.asm index 68454bdeca..a279e6ab5a 100644 --- a/UefiCpuPkg/CpuDxe/Ia32/CpuAsm.asm +++ b/UefiCpuPkg/CpuDxe/Ia32/CpuAsm.asm @@ -1,7 +1,7 @@ TITLE CpuAsm.asm:
;------------------------------------------------------------------------------
;*
-;* Copyright (c) 2006 - 2010, 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
@@ -272,6 +272,9 @@ ErrorCodeAndVectorOnStack: mov edi, esp
db 0fh, 0aeh, 07h ;fxsave [edi]
+;; UEFI calling convention for IA32 requires that Direction flag in EFLAGs is clear
+ cld
+
;; UINT32 ExceptionData;
push dword ptr [ebp + 2 * 4]
|