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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.asm
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@@ -1,7 +1,7 @@
TITLE CpuAsm.asm:
;------------------------------------------------------------------------------
;*
;* 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
@@ -207,16 +207,8 @@ NoErrorCode:
;; UINT64 Dr0, Dr1, Dr2, Dr3, Dr6, Dr7;
mov rax, dr7
push rax
;; clear Dr7 while executing debugger itself
xor rax, rax
mov dr7, rax
mov rax, dr6
push rax
;; insure all status bits in dr6 are clear...
xor rax, rax
mov dr6, rax
mov rax, dr3
push rax
mov rax, dr2
@@ -265,18 +257,9 @@ nonNullValue:
add rsp, 512
;; UINT64 Dr0, Dr1, Dr2, Dr3, Dr6, Dr7;
pop rax
mov dr0, rax
pop rax
mov dr1, rax
pop rax
mov dr2, rax
pop rax
mov dr3, rax
;; skip restore of dr6. We cleared dr6 during the context save.
add rsp, 8
pop rax
mov dr7, rax
;; Skip restoration of DRx registers to support in-circuit emualators
;; or debuggers set breakpoint in interrupt/exception context
add rsp, 8 * 6
;; UINT64 Cr0, Cr1, Cr2, Cr3, Cr4, Cr8;
pop rax