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SourceLevelDebugPkg/PeCoffExtraActionLibDebug: Support IA32 processors without debug extensions

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Use CPUID Leaf 01 to detect support for debug extensions.  
Force use of software breakpoints if debug extensions are not supported.

Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: Michael Kinney <michael.d.kinney@intel.com>
Reviewed-by: Jordan Justen <jordan.l.justen@intel.com>



git-svn-id: https://svn.code.sf.net/p/edk2/code/trunk/edk2@17219 6f19259b-4bc3-4df7-8a09-765794883524
This commit is contained in:
Michael Kinney
2015-04-27 19:51:46 +00:00
committed by mdkinney
parent d5203c10e8
commit ef530fe71f
2 changed files with 14 additions and 3 deletions
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13
SourceLevelDebugPkg/Library/PeCoffExtraActionLibDebug/PeCoffExtraActionLib.c
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@@ -1,7 +1,7 @@
/** @file
PE/Coff Extra Action library instances.
Copyright (c) 2010 - 2013, Intel Corporation. All rights reserved.<BR>
Copyright (c) 2010 - 2015, 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
@@ -65,6 +65,7 @@ PeCoffLoaderExtraActionCommon (
IA32_DESCRIPTOR IdtDescriptor;
IA32_IDT_GATE_DESCRIPTOR OriginalIdtEntry;
BOOLEAN IdtEntryHooked;
UINT32 RegEdx;
ASSERT (ImageContext != NULL);
@@ -79,6 +80,16 @@ PeCoffLoaderExtraActionCommon (
IdtEntryHooked = FALSE;
LoadImageMethod = PcdGet8 (PcdDebugLoadImageMethod);
if (LoadImageMethod == DEBUG_LOAD_IMAGE_METHOD_IO_HW_BREAKPOINT) {
//
// If the CPU does not support Debug Extensions(CPUID:01 EDX:BIT2)
// then force use of DEBUG_LOAD_IMAGE_METHOD_SOFT_INT3
//
AsmCpuid (1, NULL, NULL, NULL, &RegEdx);
if ((RegEdx & BIT2) == 0) {
LoadImageMethod = DEBUG_LOAD_IMAGE_METHOD_SOFT_INT3;
}
}
AsmReadIdtr (&IdtDescriptor);
if (LoadImageMethod == DEBUG_LOAD_IMAGE_METHOD_SOFT_INT3) {
if (!CheckDebugAgentHandler (&IdtDescriptor, SOFT_INT_VECTOR_NUM)) {