diff options
Diffstat (limited to 'UefiCpuPkg/CpuDxe/X64/CpuAsm.S')
-rw-r--r-- | UefiCpuPkg/CpuDxe/X64/CpuAsm.S | 25 |
1 files changed, 4 insertions, 21 deletions
diff --git a/UefiCpuPkg/CpuDxe/X64/CpuAsm.S b/UefiCpuPkg/CpuDxe/X64/CpuAsm.S index d6327325bf..8f191320a8 100644 --- a/UefiCpuPkg/CpuDxe/X64/CpuAsm.S +++ b/UefiCpuPkg/CpuDxe/X64/CpuAsm.S @@ -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
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