X-Git-Url: https://git.proxmox.com/?p=mirror_edk2.git;a=blobdiff_plain;f=UefiCpuPkg%2FCpuDxe%2FIa32%2FCpuAsm.S;fp=UefiCpuPkg%2FCpuDxe%2FIa32%2FCpuAsm.S;h=d3e1dee624096da54bfbc3c4c950830cfe12b1ee;hp=04896578f7e4027f4ce180e75495e9a59068af9b;hb=61ece967cb59509608aa747fc9424c619646fc9d;hpb=35a171541199329108aa8c5417386d7afce9ddbf
diff --git a/UefiCpuPkg/CpuDxe/Ia32/CpuAsm.S b/UefiCpuPkg/CpuDxe/Ia32/CpuAsm.S
index 04896578f7..d3e1dee624 100644
--- a/UefiCpuPkg/CpuDxe/Ia32/CpuAsm.S
+++ b/UefiCpuPkg/CpuDxe/Ia32/CpuAsm.S
@@ -1,6 +1,6 @@
#------------------------------------------------------------------------------
#*
-#* Copyright (c) 2006 - 2009, Intel Corporation. All rights reserved.
+#* Copyright (c) 2006 - 2010, Intel Corporation. All rights reserved.
#* 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