sravan/system76-edk2
1
0
Fork 0
Code Issues Pull Requests Packages Projects Releases Wiki Activity

Skip restoration of DRx registers to support in-circuit emualators or debuggers set breakpoint in interrupt/exception context.

Browse Source 
git-svn-id: https://edk2.svn.sourceforge.net/svnroot/edk2/trunk/edk2@10573 6f19259b-4bc3-4df7-8a09-765794883524
This commit is contained in:
rsun3
2010-06-11 03:22:15 +00:00
parent 35a1715411
commit 61ece967cb
4 changed files with 16 additions and 84 deletions
Download Patch File Download Diff File Expand all files Collapse all files

25
UefiCpuPkg/CpuDxe/Ia32/CpuAsm.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
@@ -258,16 +258,8 @@ ErrorCodeAndVectorOnStack:
#; UINT32 Dr0, Dr1, Dr2, Dr3, Dr6, Dr7;
movl %dr7, %eax
pushl %eax
#; clear Dr7 while executing debugger itself
xorl %eax, %eax
movl %eax, %dr7
movl %dr6, %eax
pushl %eax
#; insure all status bits in dr6 are clear...
xorl %eax, %eax
movl %eax, %dr6
movl %dr3, %eax
pushl %eax
movl %dr2, %eax
@@ -319,18 +311,9 @@ nullExternalExceptionHandler:
addl $512, %esp
#; UINT32 Dr0, Dr1, Dr2, Dr3, Dr6, Dr7;
popl %eax
movl %eax, %dr0
popl %eax
movl %eax, %dr1
popl %eax
movl %eax, %dr2
popl %eax
movl %eax, %dr3
#; skip restore of dr6. We cleared dr6 during the context save.
addl $4, %esp
popl %eax
movl %eax, %dr7
#; Skip restoration of DRx registers to support in-circuit emualators
#; or debuggers set breakpoint in interrupt/exception context
addl $24, %esp
#; UINT32 Cr0, Cr1, Cr2, Cr3, Cr4;
popl %eax