Luchian Mihai
c2f9368c7e
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127 lines
3.9 KiB
C
127 lines
3.9 KiB
C
/****************************************************************************
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* arch/arm/src/armv6-m/arm_hardfault.c
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*
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* SPDX-License-Identifier: Apache-2.0
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*
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* Licensed to the Apache Software Foundation (ASF) under one or more
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* contributor license agreements. See the NOTICE file distributed with
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* this work for additional information regarding copyright ownership. The
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* ASF licenses this file to you under the Apache License, Version 2.0 (the
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* "License"); you may not use this file except in compliance with the
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* License. You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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* License for the specific language governing permissions and limitations
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* under the License.
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*
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****************************************************************************/
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/****************************************************************************
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* Included Files
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****************************************************************************/
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#include <nuttx/config.h>
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#include <stdint.h>
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#include <string.h>
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#include <assert.h>
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#include <debug.h>
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#include <irq.h>
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#include "nvic.h"
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#include "arm_internal.h"
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/****************************************************************************
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* Pre-processor Definitions
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****************************************************************************/
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#ifdef CONFIG_DEBUG_HARDFAULT_ALERT
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# define hfalert(format, ...) _alert(format, ##__VA_ARGS__)
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#else
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# define hfalert(x...)
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#endif
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#ifdef CONFIG_DEBUG_HARDFAULT_INFO
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# define hfinfo(format, ...) _info(format, ##__VA_ARGS__)
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#else
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# define hfinfo(x...)
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#endif
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#define INSN_SVC0 0xdf00 /* insn: svc 0 */
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/****************************************************************************
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* Public Functions
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****************************************************************************/
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/****************************************************************************
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* Name: arm_hardfault
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*
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* Description:
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* This is Hard Fault exception handler. It also catches SVC call
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* exceptions that are performed in bad contexts.
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*
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****************************************************************************/
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int arm_hardfault(int irq, void *context, void *arg)
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{
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uint32_t *regs = (uint32_t *)context;
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/* Get the value of the program counter where the fault occurred */
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uint16_t *pc = (uint16_t *)regs[REG_PC] - 1;
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/* Check if the pc lies in known FLASH memory.
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* REVISIT: What if the PC lies in "unknown" external memory?
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*/
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#ifdef CONFIG_BUILD_PROTECTED
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/* In the kernel build, SVCalls are expected in either the base, kernel
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* FLASH region or in the user FLASH region.
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*/
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if (((uintptr_t)pc >= (uintptr_t)_stext &&
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(uintptr_t)pc < (uintptr_t)_etext) ||
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((uintptr_t)pc >= (uintptr_t)USERSPACE->us_textstart &&
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(uintptr_t)pc < (uintptr_t)USERSPACE->us_textend))
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#else
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/* SVCalls are expected only from the base, kernel FLASH region */
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if ((uintptr_t)pc >= (uintptr_t)_stext &&
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(uintptr_t)pc < (uintptr_t)_etext)
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#endif
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{
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/* Fetch the instruction that caused the Hard fault */
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uint16_t insn = *pc;
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hfinfo(" PC: %p INSN: %04x\n", pc, insn);
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/* If this was the instruction 'svc 0', then forward processing
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* to the SVCall handler
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*/
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if (insn == INSN_SVC0)
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{
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hfinfo("Forward SVCall\n");
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return arm_svcall(irq, context, NULL);
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}
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}
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#if defined(CONFIG_DEBUG_HARDFAULT_ALERT)
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/* Dump some hard fault info */
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hfalert("\nHard Fault:\n");
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hfalert(" IRQ: %d regs: %p\n", irq, regs);
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hfalert(" PRIMASK: %08x IPSR: %08x\n",
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getprimask(), getipsr());
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#endif
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up_irq_save();
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hfalert("PANIC!!! Hard fault\n");
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PANIC_WITH_REGS("panic", context);
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return OK; /* Won't get here */
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}
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