exceptions.c
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/*********************************************************************
*
* Generic Exception Handler
*
*********************************************************************
* FileName: exceptions.c
* Dependencies:
*
* Processor: PIC32
*
* Complier: MPLAB C32
* MPLAB IDE
* Company: Microchip Technology, Inc.
* Author: Darren Wenn
*
* Software License Agreement
*
* The software supplied herewith by Microchip Technology Incorporated
* (the “Company”) for its PIC32/PIC24 Microcontroller is intended
* and supplied to you, the Company’s customer, for use solely and
* exclusively on Microchip PIC32/PIC24 Microcontroller products.
* The software is owned by the Company and/or its supplier, and is
* protected under applicable copyright laws. All rights are reserved.
* Any use in violation of the foregoing restrictions may subject the
* user to criminal sanctions under applicable laws, as well as to
* civil liability for the breach of the terms and conditions of this
* license.
*
* THIS SOFTWARE IS PROVIDED IN AN “AS IS” CONDITION. NO WARRANTIES,
* WHETHER EXPRESS, IMPLIED OR STATUTORY, INCLUDING, BUT NOT LIMITED
* TO, IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A
* PARTICULAR PURPOSE APPLY TO THIS SOFTWARE. THE COMPANY SHALL NOT,
* IN ANY CIRCUMSTANCES, BE LIABLE FOR SPECIAL, INCIDENTAL OR
* CONSEQUENTIAL DAMAGES, FOR ANY REASON WHATSOEVER.
*
*
*
********************************************************************/
#include <p32xxxx.h>
// declared static in case exception condition would prevent
// auto variable being created
static enum {
EXCEP_IRQ = 0, // interrupt
EXCEP_AdEL = 4, // address error exception (load or ifetch)
EXCEP_AdES, // address error exception (store)
EXCEP_IBE, // bus error (ifetch)
EXCEP_DBE, // bus error (load/store)
EXCEP_Sys, // syscall
EXCEP_Bp, // breakpoint
EXCEP_RI, // reserved instruction
EXCEP_CpU, // coprocessor unusable
EXCEP_Overflow, // arithmetic overflow
EXCEP_Trap, // trap (possible divide by zero)
EXCEP_IS1 = 16, // implementation specfic 1
EXCEP_CEU, // CorExtend Unuseable
EXCEP_C2E // coprocessor 2
} _excep_code;
static unsigned int _epc_code;
static unsigned int _excep_addr;
#include <rtthread.h>
// this function overrides the normal _weak_ generic handler
void _general_exception_handler(void)
{
asm volatile("mfc0 %0,$13" : "=r" (_excep_code));
asm volatile("mfc0 %0,$14" : "=r" (_excep_addr));
_excep_code = (_excep_code & 0x0000007C) >> 2;
rt_kprintf("\r\n_excep_code : %08X\r\n",_excep_code);
rt_kprintf("_excep_addr : %08X\r\n",_excep_addr);
switch(_excep_code)
{
case EXCEP_IRQ:rt_kprintf("interrupt\r\n");break;
case EXCEP_AdEL:rt_kprintf("address error exception (load or ifetch)\r\n");break;
case EXCEP_AdES:rt_kprintf("address error exception (store)\r\n");break;
case EXCEP_IBE:rt_kprintf("bus error (ifetch)\r\n");break;
case EXCEP_DBE:rt_kprintf("bus error (load/store)\r\n");break;
case EXCEP_Sys:rt_kprintf("syscall\r\n");break;
case EXCEP_Bp:rt_kprintf("breakpoint\r\n");break;
case EXCEP_RI:rt_kprintf("reserved instruction\r\n");break;
case EXCEP_CpU:rt_kprintf("coprocessor unusable\r\n");break;
case EXCEP_Overflow:rt_kprintf("arithmetic overflow\r\n");break;
case EXCEP_Trap:rt_kprintf("trap (possible divide by zero)\r\n");break;
case EXCEP_IS1:rt_kprintf("implementation specfic 1\r\n");break;
case EXCEP_CEU:rt_kprintf("CorExtend Unuseable\r\n");break;
case EXCEP_C2E:rt_kprintf("coprocessor 2\r\n");break;
default : rt_kprintf("unkown exception\r\n");break;
}
while (1) {
// Examine _excep_code to identify the type of exception
// Examine _excep_addr to find the address that caused the exception
}
}