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 - 2021, Arm Limited. All rights reserved.<BR>
   6 * Copyright (c) 2016 HP Development Company, L.P.<BR>
   7 *
   8 *  SPDX-License-Identifier: BSD-2-Clause-Patent
   9 *
  10 **/
  11
  12 #include <Uefi.h>
  13
  14 #include <Chipset/ArmV7.h>
  15
  16 #include <Library/ArmLib.h>
  17
  18 #include <Protocol/DebugSupport.h> // for MAX_ARM_EXCEPTION
  19
  20 UINTN                   gMaxExceptionNumber                               = MAX_ARM_EXCEPTION;
  21 EFI_EXCEPTION_CALLBACK  gExceptionHandlers[MAX_ARM_EXCEPTION + 1]         = { 0 };
  22 EFI_EXCEPTION_CALLBACK  gDebuggerExceptionHandlers[MAX_ARM_EXCEPTION + 1] = { 0 };
  23 PHYSICAL_ADDRESS        gExceptionVectorAlignmentMask                     = ARM_VECTOR_TABLE_ALIGNMENT;
  24
  25 // Exception handler contains branch to vector location (jmp $) so no handler
  26 // NOTE: This code assumes vectors are ARM and not Thumb code
  27 UINTN  gDebuggerNoHandlerValue = 0xEAFFFFFE;
  28
  29 RETURN_STATUS
  30 ArchVectorConfig (
  31   IN  UINTN  VectorBaseAddress
  32   )
  33 {
  34   // if the vector address corresponds to high vectors
  35   if (VectorBaseAddress == 0xFFFF0000) {
  36     // set SCTLR.V to enable high vectors
  37     ArmSetHighVectors ();
  38   } else {
  39     // Set SCTLR.V to 0 to enable VBAR to be used
  40     ArmSetLowVectors ();
  41   }
  42
  43   return RETURN_SUCCESS;
  44 }