2939c778a3
Introduce ARM and AArch64 instances of the CpuExceptionHandlerLib which provides exception handling and registration of handlers regardless of execution phase. Two variants of the ArmExceptionLib are provided: one where exception handlers reside within the module (meeting appropriate architectural alignment requirements for the vector table) and another one that will relocate a copy of thee xception handlers to an address specified by PcdCpuVectorBaseAddress. The ArmRelocateExceptionLib is intended for use in cases where ArmExceptionLib is too large for the application (uncompressed XIP images) as driven by the vector table alignment padding. The AArch64 build of this library supports execution at EL1, EL2, and EL3 exception levels. Tested on ARM, and AArch64 with SEC, DXE Core, and CpuDxe modules. Contributed-under: TianoCore Contribution Agreement 1.0 Signed-off-by: Eugene Cohen <eugene@hp.com> Reviewed-by: Ard Biesheuvel <ard.biesheuvel@linaro.org>
51 lines
1.7 KiB
C
51 lines
1.7 KiB
C
/** @file
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* Exception handling support specific for ARM
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*
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* Copyright (c) 2008 - 2009, Apple Inc. All rights reserved.<BR>
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* Copyright (c) 2014, ARM Limited. All rights reserved.<BR>
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* Copyright (c) 2016 HP Development Company, L.P.<BR>
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*
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* This program and the accompanying materials
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* are licensed and made available under the terms and conditions of the BSD License
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* which accompanies this distribution. The full text of the license may be found at
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* http://opensource.org/licenses/bsd-license.php
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*
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* THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
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* WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
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*
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**/
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#include <Uefi.h>
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#include <Chipset/ArmV7.h>
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#include <Library/ArmLib.h>
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#include <Protocol/DebugSupport.h> // for MAX_ARM_EXCEPTION
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UINTN gMaxExceptionNumber = MAX_ARM_EXCEPTION;
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EFI_EXCEPTION_CALLBACK gExceptionHandlers[MAX_ARM_EXCEPTION + 1] = { 0 };
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EFI_EXCEPTION_CALLBACK gDebuggerExceptionHandlers[MAX_ARM_EXCEPTION + 1] = { 0 };
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PHYSICAL_ADDRESS gExceptionVectorAlignmentMask = ARM_VECTOR_TABLE_ALIGNMENT;
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// Exception handler contains branch to vector location (jmp $) so no handler
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// NOTE: This code assumes vectors are ARM and not Thumb code
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UINTN gDebuggerNoHandlerValue = 0xEAFFFFFE;
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RETURN_STATUS ArchVectorConfig(
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IN UINTN VectorBaseAddress
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)
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{
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// if the vector address corresponds to high vectors
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if (VectorBaseAddress == 0xFFFF0000) {
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// set SCTLR.V to enable high vectors
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ArmSetHighVectors();
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}
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else {
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// Set SCTLR.V to 0 to enable VBAR to be used
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ArmSetLowVectors();
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}
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return RETURN_SUCCESS;
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}
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