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