1 /* 2 * Copyright (C) 2013-2014 Synopsys, Inc. All rights reserved. 3 * 4 * SPDX-License-Identifier: GPL-2.0+ 5 */ 6 7 #include <common.h> 8 #include <asm/arcregs.h> 9 #include <asm/ptrace.h> 10 11 /* Bit values in STATUS32 */ 12 #define E1_MASK (1 << 1) /* Level 1 interrupts enable */ 13 #define E2_MASK (1 << 2) /* Level 2 interrupts enable */ 14 15 int interrupt_init(void) 16 { 17 return 0; 18 } 19 20 /* 21 * returns true if interrupts had been enabled before we disabled them 22 */ 23 int disable_interrupts(void) 24 { 25 int status = read_aux_reg(ARC_AUX_STATUS32); 26 int state = (status & (E1_MASK | E2_MASK)) ? 1 : 0; 27 28 status &= ~(E1_MASK | E2_MASK); 29 /* STATUS32 register is updated indirectly with "FLAG" instruction */ 30 __asm__("flag %0" : : "r" (status)); 31 return state; 32 } 33 34 void enable_interrupts(void) 35 { 36 unsigned int status = read_aux_reg(ARC_AUX_STATUS32); 37 38 status |= E1_MASK | E2_MASK; 39 /* STATUS32 register is updated indirectly with "FLAG" instruction */ 40 __asm__("flag %0" : : "r" (status)); 41 } 42 43 static void print_reg_file(long *reg_rev, int start_num) 44 { 45 unsigned int i; 46 47 /* Print 3 registers per line */ 48 for (i = start_num; i < start_num + 25; i++) { 49 printf("r%02u: 0x%08lx\t", i, (unsigned long)*reg_rev); 50 if (((i + 1) % 3) == 0) 51 printf("\n"); 52 53 /* Because pt_regs has registers reversed */ 54 reg_rev--; 55 } 56 57 /* Add new-line if none was inserted in the end of loop above */ 58 if (((i + 1) % 3) != 0) 59 printf("\n"); 60 } 61 62 void show_regs(struct pt_regs *regs) 63 { 64 printf("ECR:\t0x%08lx\n", regs->ecr); 65 printf("RET:\t0x%08lx\nBLINK:\t0x%08lx\nSTAT32:\t0x%08lx\n", 66 regs->ret, regs->blink, regs->status32); 67 printf("GP: 0x%08lx\t r25: 0x%08lx\t\n", regs->r26, regs->r25); 68 printf("BTA: 0x%08lx\t SP: 0x%08lx\t FP: 0x%08lx\n", regs->bta, 69 regs->sp, regs->fp); 70 printf("LPS: 0x%08lx\tLPE: 0x%08lx\tLPC: 0x%08lx\n", regs->lp_start, 71 regs->lp_end, regs->lp_count); 72 73 print_reg_file(&(regs->r0), 0); 74 } 75 76 void bad_mode(struct pt_regs *regs) 77 { 78 if (regs) 79 show_regs(regs); 80 81 panic("Resetting CPU ...\n"); 82 } 83 84 void do_memory_error(unsigned long address, struct pt_regs *regs) 85 { 86 printf("Memory error exception @ 0x%lx\n", address); 87 bad_mode(regs); 88 } 89 90 void do_instruction_error(unsigned long address, struct pt_regs *regs) 91 { 92 printf("Instruction error exception @ 0x%lx\n", address); 93 bad_mode(regs); 94 } 95 96 void do_machine_check_fault(unsigned long address, struct pt_regs *regs) 97 { 98 printf("Machine check exception @ 0x%lx\n", address); 99 bad_mode(regs); 100 } 101 102 void do_interrupt_handler(void) 103 { 104 printf("Interrupt fired\n"); 105 bad_mode(0); 106 } 107 108 void do_itlb_miss(struct pt_regs *regs) 109 { 110 printf("I TLB miss exception\n"); 111 bad_mode(regs); 112 } 113 114 void do_dtlb_miss(struct pt_regs *regs) 115 { 116 printf("D TLB miss exception\n"); 117 bad_mode(regs); 118 } 119 120 void do_tlb_prot_violation(unsigned long address, struct pt_regs *regs) 121 { 122 printf("TLB protection violation or misaligned access @ 0x%lx\n", 123 address); 124 bad_mode(regs); 125 } 126 127 void do_privilege_violation(struct pt_regs *regs) 128 { 129 printf("Privilege violation exception\n"); 130 bad_mode(regs); 131 } 132 133 void do_trap(struct pt_regs *regs) 134 { 135 printf("Trap exception\n"); 136 bad_mode(regs); 137 } 138 139 void do_extension(struct pt_regs *regs) 140 { 141 printf("Extension instruction exception\n"); 142 bad_mode(regs); 143 } 144