/********************************************************************* * * 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 } }