diff options
| author | rsun3 <rsun3@6f19259b-4bc3-4df7-8a09-765794883524> | 2010-06-11 03:22:15 +0000 |
|---|---|---|
| committer | rsun3 <rsun3@6f19259b-4bc3-4df7-8a09-765794883524> | 2010-06-11 03:22:15 +0000 |
| commit | 61ece967cb59509608aa747fc9424c619646fc9d (patch) | |
| tree | 6cee43d096781130afa236717fb2838acc4952e1 /UefiCpuPkg/CpuDxe/Ia32/CpuAsm.S | |
| parent | 35a171541199329108aa8c5417386d7afce9ddbf (diff) | |
| download | edk2-platforms-61ece967cb59509608aa747fc9424c619646fc9d.tar.xz | |
Skip restoration of DRx registers to support in-circuit emualators or debuggers set breakpoint in interrupt/exception context.
git-svn-id: https://edk2.svn.sourceforge.net/svnroot/edk2/trunk/edk2@10573 6f19259b-4bc3-4df7-8a09-765794883524
Diffstat (limited to 'UefiCpuPkg/CpuDxe/Ia32/CpuAsm.S')
| -rw-r--r-- | UefiCpuPkg/CpuDxe/Ia32/CpuAsm.S | 25 |
1 files changed, 4 insertions, 21 deletions
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.<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
|