ArmPkg/Library/ArmExceptionLib/Arm/ArmException.c

   1 /** @file
   2 *  Exception handling support specific for ARM
   3 *
   4 * Copyright (c) 2008 - 2009, Apple Inc. All rights reserved.<BR>
   5 * Copyright (c) 2014, ARM Limited. All rights reserved.<BR>
   6 * Copyright (c) 2016 HP Development Company, L.P.<BR>
   7 *
   8 *  This program and the accompanying materials
   9 *  are licensed and made available under the terms and conditions of the BSD License
  10 *  which accompanies this distribution.  The full text of the license may be found at
  11 *  http://opensource.org/licenses/bsd-license.php
  12 *
  13 *  THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
  14 *  WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
  15 *
  16 **/
  17
  18 #include <Uefi.h>
  19
  20 #include <Chipset/ArmV7.h>
  21
  22 #include <Library/ArmLib.h>
  23
  24 #include <Protocol/DebugSupport.h> // for MAX_ARM_EXCEPTION
  25
  26 UINTN                   gMaxExceptionNumber = MAX_ARM_EXCEPTION;
  27 EFI_EXCEPTION_CALLBACK  gExceptionHandlers[MAX_ARM_EXCEPTION + 1] = { 0 };
  28 EFI_EXCEPTION_CALLBACK  gDebuggerExceptionHandlers[MAX_ARM_EXCEPTION + 1] = { 0 };
  29 PHYSICAL_ADDRESS        gExceptionVectorAlignmentMask = ARM_VECTOR_TABLE_ALIGNMENT;
  30
  31 // Exception handler contains branch to vector location (jmp $) so no handler
  32 // NOTE: This code assumes vectors are ARM and not Thumb code
  33 UINTN                   gDebuggerNoHandlerValue = 0xEAFFFFFE;
  34
  35 RETURN_STATUS ArchVectorConfig(
  36   IN  UINTN       VectorBaseAddress
  37   )
  38 {
  39   // if the vector address corresponds to high vectors
  40   if (VectorBaseAddress == 0xFFFF0000) {
  41     // set SCTLR.V to enable high vectors
  42     ArmSetHighVectors();
  43   }
  44   else {
  45     // Set SCTLR.V to 0 to enable VBAR to be used
  46     ArmSetLowVectors();
  47   }
  48
  49   return RETURN_SUCCESS;
  50 }