1// SPDX-License-Identifier: GPL-2.0+ 2/* 3 * (C) Copyright 2007 Michal Simek 4 * 5 * Michal SIMEK <monstr@monstr.eu> 6 */ 7 8#include <hang.h> 9#include <stdio.h> 10#include <asm/asm.h> 11 12void _hw_exception_handler (void) 13{ 14 int address = 0; 15 int state = 0; 16 17 /* loading address of exception EAR */ 18 MFS(address, rear); 19 /* loading exception state register ESR */ 20 MFS(state, resr); 21 printf("Hardware exception at 0x%x address\n", address); 22 R17(address); 23 24 if (CONFIG_IS_ENABLED(XILINX_MICROBLAZE0_DELAY_SLOT_EXCEP) && 25 (state & 0x1000)) { 26 /* 27 * For exceptions in delay slots, the return address is stored 28 * in the Branch Target Register (BTR), rather than R17. 29 */ 30 MFS(address, rbtr); 31 32 puts("Exception in delay slot\n"); 33 } 34 35 switch (state & 0x1f) { /* mask on exception cause */ 36 case 0x1: 37 puts("Unaligned data access exception\n"); 38 39 printf("Unaligned %sword access\n", ((state & 0x800) ? "" : "half")); 40 printf("Unaligned %s access\n", ((state & 0x400) ? "store" : "load")); 41 printf("Register R%x\n", (state & 0x3E0) >> 5); 42 break; 43 case 0x2: 44 puts("Illegal op-code exception\n"); 45 break; 46 case 0x3: 47 puts("Instruction bus error exception\n"); 48 break; 49 case 0x4: 50 puts("Data bus error exception\n"); 51 break; 52 case 0x5: 53 puts("Divide by zero exception\n"); 54 break; 55 case 0x7: 56 puts("Priviledged or stack protection violation exception\n"); 57 break; 58 default: 59 puts("Undefined cause\n"); 60 break; 61 } 62 63 printf("Return address from exception 0x%x\n", address); 64 hang(); 65} 66 67#if CONFIG_IS_ENABLED(XILINX_MICROBLAZE0_USR_EXCEP) 68void _exception_handler (void) 69{ 70 puts("User vector_exception\n"); 71 hang(); 72} 73#endif 74