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

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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
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25
UefiCpuPkg/CpuDxe/X64/CpuAsm.S
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@@ -2,7 +2,7 @@
#------------------------------------------------------------------------------
#*
#* Copyright (c) 2008 - 2009, Intel Corporation. All rights reserved.<BR>
#* Copyright (c) 2008 - 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
@@ -218,16 +218,8 @@ CommonInterruptEntry_al_0000:
#; UINT64 Dr0, Dr1, Dr2, Dr3, Dr6, Dr7;
movq %dr7, %rax
pushq %rax
#; clear Dr7 while executing debugger itself
xorq %rax, %rax
movq %rax, %dr7
movq %dr6, %rax
pushq %rax
#; insure all status bits in dr6 are clear...
xorq %rax, %rax
movq %rax, %dr6
movq %dr3, %rax
pushq %rax
movq %dr2, %rax
@@ -277,18 +269,9 @@ nonNullValue:
addq $512, %rsp
#; UINT64 Dr0, Dr1, Dr2, Dr3, Dr6, Dr7;
popq %rax
movq %rax, %dr0
popq %rax
movq %rax, %dr1
popq %rax
movq %rax, %dr2
popq %rax
movq %rax, %dr3
#; skip restore of dr6. We cleared dr6 during the context save.
addq $8, %rsp
popq %rax
movq %rax, %dr7
#; Skip restoration of DRx registers to support in-circuit emualators
#; or debuggers set breakpoint in interrupt/exception context
addq $48, %rsp
#; UINT64 Cr0, Cr1, Cr2, Cr3, Cr4, Cr8;
popq %rax