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Fix the issue that the high 16-bit of EAX may contain invalid data, which cause bad stack pointer, the change will ensure the high 16-bit of EAX is cleared. 

git-svn-id: https://edk2.svn.sourceforge.net/svnroot/edk2/trunk/edk2@11048 6f19259b-4bc3-4df7-8a09-765794883524
This commit is contained in:
li-elvin 2010-11-12 07:48:32 +00:00
parent 4d4c535a32
commit 13f06a56bf
2 changed files with 4 additions and 4 deletions
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4
UnixPkg/Library/UnixBaseLib/X64/Thunk16.S
View File

@ -1,6 +1,6 @@
#------------------------------------------------------------------------------
#
# Copyright (c) 2006 - 2009, Intel Corporation. All rights reserved.<BR>
# Copyright (c) 2006 - 2010, 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
@ -104,7 +104,7 @@ L_1:
orb $2,%al
outb %al, $0x92 # deactivate A20M#
L_2:
movl %ss,%eax
movw %ss,%ax
lea IA32_REGS_SIZE(%esp), %bp
#
# rsi in the following 2 instructions is indeed bp in 16-bit code

4
UnixPkg/Library/UnixBaseLib/X64/Thunk16.asm
View File

@ -3,7 +3,7 @@
;------------------------------------------------------------------------------
;
; Copyright (c) 2006 - 2008, Intel Corporation. All rights reserved.<BR>
; Copyright (c) 2006 - 2010, 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
@ -105,7 +105,7 @@ _ThunkAttr DD ?
or al, 2
out 92h, al ; deactivate A20M#
@2:
mov eax, ss
mov ax, ss
lea bp, [esp + sizeof (IA32_REGS)]
;
; rsi in the following 2 instructions is indeed bp in 16-bit code