/*
* Copyright (c) 2013-2018 Arm Limited. All rights reserved.
*
* SPDX-License-Identifier: Apache-2.0
*
* Licensed under the Apache License, Version 2.0 (the License); you may
* not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an AS IS BASIS, WITHOUT
* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*
* -----------------------------------------------------------------------------
*
* Project: CMSIS-RTOS RTX
* Title: Exception handlers (C functions)
*
* -----------------------------------------------------------------------------
*/
#include "RTE_Components.h"
#include CMSIS_device_header
//Fault Status Register (IFSR/DFSR) definitions
#define FSR_ALIGNMENT_FAULT 0x01 //DFSR only. Fault on first lookup
#define FSR_INSTRUCTION_CACHE_MAINTENANCE 0x04 //DFSR only - async/external
#define FSR_SYNC_EXT_TTB_WALK_FIRST 0x0c //sync/external
#define FSR_SYNC_EXT_TTB_WALK_SECOND 0x0e //sync/external
#define FSR_SYNC_PARITY_TTB_WALK_FIRST 0x1c //sync/external
#define FSR_SYNC_PARITY_TTB_WALK_SECOND 0x1e //sync/external
#define FSR_TRANSLATION_FAULT_FIRST 0x05 //MMU Fault - internal
#define FSR_TRANSLATION_FAULT_SECOND 0x07 //MMU Fault - internal
#define FSR_ACCESS_FLAG_FAULT_FIRST 0x03 //MMU Fault - internal
#define FSR_ACCESS_FLAG_FAULT_SECOND 0x06 //MMU Fault - internal
#define FSR_DOMAIN_FAULT_FIRST 0x09 //MMU Fault - internal
#define FSR_DOMAIN_FAULT_SECOND 0x0b //MMU Fault - internal
#define FSR_PERMISSION_FAULT_FIRST 0x0f //MMU Fault - internal
#define FSR_PERMISSION_FAULT_SECOND 0x0d //MMU Fault - internal
#define FSR_DEBUG_EVENT 0x02 //internal
#define FSR_SYNC_EXT_ABORT 0x08 //sync/external
#define FSR_TLB_CONFLICT_ABORT 0x10 //sync/external
#define FSR_LOCKDOWN 0x14 //internal
#define FSR_COPROCESSOR_ABORT 0x1a //internal
#define FSR_SYNC_PARITY_ERROR 0x19 //sync/external
#define FSR_ASYNC_EXTERNAL_ABORT 0x16 //DFSR only - async/external
#define FSR_ASYNC_PARITY_ERROR 0x18 //DFSR only - async/external
void CDAbtHandler(uint32_t DFSR, uint32_t DFAR, uint32_t LR) {
uint32_t FS = (DFSR & (1U << 10U)) >> 6U | (DFSR & 0x0FU); //Store Fault Status
(void)DFAR;
(void)LR;
switch(FS) {
//Synchronous parity errors - retry
case FSR_SYNC_PARITY_ERROR:
case FSR_SYNC_PARITY_TTB_WALK_FIRST:
case FSR_SYNC_PARITY_TTB_WALK_SECOND:
return;
//Your code here. Value in DFAR is invalid for some fault statuses.
case FSR_ALIGNMENT_FAULT:
case FSR_INSTRUCTION_CACHE_MAINTENANCE:
case FSR_SYNC_EXT_TTB_WALK_FIRST:
case FSR_SYNC_EXT_TTB_WALK_SECOND:
case FSR_TRANSLATION_FAULT_FIRST:
case FSR_TRANSLATION_FAULT_SECOND:
case FSR_ACCESS_FLAG_FAULT_FIRST:
case FSR_ACCESS_FLAG_FAULT_SECOND:
case FSR_DOMAIN_FAULT_FIRST:
case FSR_DOMAIN_FAULT_SECOND:
case FSR_PERMISSION_FAULT_FIRST:
case FSR_PERMISSION_FAULT_SECOND:
case FSR_DEBUG_EVENT:
case FSR_SYNC_EXT_ABORT:
case FSR_TLB_CONFLICT_ABORT:
case FSR_LOCKDOWN:
case FSR_COPROCESSOR_ABORT:
case FSR_ASYNC_EXTERNAL_ABORT: //DFAR invalid
case FSR_ASYNC_PARITY_ERROR: //DFAR invalid
default:
while(1);
}
}
void CPAbtHandler(uint32_t IFSR, uint32_t IFAR, uint32_t LR) {
uint32_t FS = (IFSR & (1U << 10U)) >> 6U | (IFSR & 0x0FU); //Store Fault Status
(void)IFAR;
(void)LR;
switch(FS) {
//Synchronous parity errors - retry
case FSR_SYNC_PARITY_ERROR:
case FSR_SYNC_PARITY_TTB_WALK_FIRST:
case FSR_SYNC_PARITY_TTB_WALK_SECOND:
return;
//Your code here. Value in IFAR is invalid for some fault statuses.
case FSR_SYNC_EXT_TTB_WALK_FIRST:
case FSR_SYNC_EXT_TTB_WALK_SECOND:
case FSR_TRANSLATION_FAULT_FIRST:
case FSR_TRANSLATION_FAULT_SECOND:
case FSR_ACCESS_FLAG_FAULT_FIRST:
case FSR_ACCESS_FLAG_FAULT_SECOND:
case FSR_DOMAIN_FAULT_FIRST:
case FSR_DOMAIN_FAULT_SECOND:
case FSR_PERMISSION_FAULT_FIRST:
case FSR_PERMISSION_FAULT_SECOND:
case FSR_DEBUG_EVENT: //IFAR invalid
case FSR_SYNC_EXT_ABORT:
case FSR_TLB_CONFLICT_ABORT:
case FSR_LOCKDOWN:
case FSR_COPROCESSOR_ABORT:
default:
while(1);
}
}
//returns amount to decrement lr by
//this will be 0 when we have emulated the instruction and want to execute the next instruction
//this will be 2 when we have performed some maintenance and want to retry the instruction in Thumb (state == 2)
//this will be 4 when we have performed some maintenance and want to retry the instruction in Arm (state == 4)
uint32_t CUndefHandler(uint32_t opcode, uint32_t state, uint32_t LR) {
const uint32_t THUMB = 2U;
const uint32_t ARM = 4U;
(void)LR;
//Lazy VFP/NEON initialisation and switching
// (Arm Architecture Reference Manual section A7.5) VFP data processing instruction?
// (Arm Architecture Reference Manual section A7.6) VFP/NEON register load/store instruction?
// (Arm Architecture Reference Manual section A7.8) VFP/NEON register data transfer instruction?
// (Arm Architecture Reference Manual section A7.9) VFP/NEON 64-bit register data transfer instruction?
if ((state == ARM && ((opcode & 0x0C000000U) >> 26U == 0x03U)) ||
(state == THUMB && ((opcode & 0xEC000000U) >> 26U == 0x3BU))) {
if (((opcode & 0x00000E00U) >> 9U) == 5U) {
__FPU_Enable();
return state;
}
}
// (Arm Architecture Reference Manual section A7.4) NEON data processing instruction?
if ((state == ARM && ((opcode & 0xFE000000U) >> 24U == 0xF2U)) ||
(state == THUMB && ((opcode & 0xEF000000U) >> 24U == 0xEFU)) ||
// (Arm Architecture Reference Manual section A7.7) NEON load/store instruction?
(state == ARM && ((opcode >> 24U) == 0xF4U)) ||
(state == THUMB && ((opcode >> 24U) == 0xF9U))) {
__FPU_Enable();
return state;
}
//Add code here for other Undef cases
while(1);
}
