1 /* 2 * (C) Copyright 2015 3 * Kamil Lulko, <kamil.lulko@gmail.com> 4 * 5 * SPDX-License-Identifier: GPL-2.0+ 6 */ 7 8 #include <common.h> 9 10 /* 11 * Upon exception entry ARMv7-M processors automatically save stack 12 * frames containing some registers. For simplicity initial 13 * implementation uses only this auto-saved stack frame. 14 * This does not contain complete register set dump, 15 * only R0-R3, R12, LR, PC and xPSR are saved. 16 */ 17 18 struct autosave_regs { 19 long uregs[8]; 20 }; 21 22 #define ARM_XPSR uregs[7] 23 #define ARM_PC uregs[6] 24 #define ARM_LR uregs[5] 25 #define ARM_R12 uregs[4] 26 #define ARM_R3 uregs[3] 27 #define ARM_R2 uregs[2] 28 #define ARM_R1 uregs[1] 29 #define ARM_R0 uregs[0] 30 31 int interrupt_init(void) 32 { 33 return 0; 34 } 35 36 void enable_interrupts(void) 37 { 38 return; 39 } 40 41 int disable_interrupts(void) 42 { 43 return 0; 44 } 45 46 void dump_regs(struct autosave_regs *regs) 47 { 48 printf("pc : %08lx lr : %08lx xPSR : %08lx\n", 49 regs->ARM_PC, regs->ARM_LR, regs->ARM_XPSR); 50 printf("r12 : %08lx r3 : %08lx r2 : %08lx\n" 51 "r1 : %08lx r0 : %08lx\n", 52 regs->ARM_R12, regs->ARM_R3, regs->ARM_R2, 53 regs->ARM_R1, regs->ARM_R0); 54 } 55 56 void bad_mode(void) 57 { 58 panic("Resetting CPU ...\n"); 59 reset_cpu(0); 60 } 61 62 void do_hard_fault(struct autosave_regs *autosave_regs) 63 { 64 printf("Hard fault\n"); 65 dump_regs(autosave_regs); 66 bad_mode(); 67 } 68 69 void do_mm_fault(struct autosave_regs *autosave_regs) 70 { 71 printf("Memory management fault\n"); 72 dump_regs(autosave_regs); 73 bad_mode(); 74 } 75 76 void do_bus_fault(struct autosave_regs *autosave_regs) 77 { 78 printf("Bus fault\n"); 79 dump_regs(autosave_regs); 80 bad_mode(); 81 } 82 83 void do_usage_fault(struct autosave_regs *autosave_regs) 84 { 85 printf("Usage fault\n"); 86 dump_regs(autosave_regs); 87 bad_mode(); 88 } 89 90 void do_invalid_entry(struct autosave_regs *autosave_regs) 91 { 92 printf("Exception\n"); 93 dump_regs(autosave_regs); 94 bad_mode(); 95 } 96