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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@11046 6f19259b-4bc3-4df7-8a09-765794883524
This commit is contained in:
li-elvin 2010-11-12 07:45:08 +00:00
parent aec905b7d3
commit be3b67bca5
4 changed files with 8 additions and 8 deletions
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4
EdkCompatibilityPkg/Foundation/Library/EdkIIGlueLib/Library/BaseLib/Ia32/Thunk16.S
View File

@ -1,6 +1,6 @@
#------------------------------------------------------------------------------
#
# Copyright (c) 2006, 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
@ -55,7 +55,7 @@ ASM_PFX(ThunkAttr): .space 4
orb $2, %al
outb %al, $0x92 # deactivate A20M#
2:
movl %ss, %eax
movw %ss, %ax
.byte 0x67, 0x66, 0x8d, 0x6c, 0x24, 0x34, 0x66
mov %ebp, 0xffffffd8(%esi)
mov 0xfffffff8(%esi), %ebx

4
EdkCompatibilityPkg/Foundation/Library/EdkIIGlueLib/Library/BaseLib/Ia32/Thunk16.asm
View File

@ -1,4 +1,4 @@
; Copyright (c) 2004, Intel Corporation. All rights reserved.<BR>
; Copyright (c) 2004 - 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
@ -108,7 +108,7 @@ _ThunkAttr DD ?
or al, 2
out 92h, al ; deactivate A20M#
@2:
mov eax, ss
mov ax, ss
DB 67h
lea bp, [esp + sizeof (IA32_REGS)]
;

4
EdkCompatibilityPkg/Foundation/Library/EdkIIGlueLib/Library/BaseLib/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
EdkCompatibilityPkg/Foundation/Library/EdkIIGlueLib/Library/BaseLib/X64/Thunk16.asm
View File

@ -1,4 +1,4 @@
; Copyright (c) 2004, Intel Corporation. All rights reserved.<BR>
; Copyright (c) 2004 - 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
@ -103,7 +103,7 @@ _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