1 // SPDX-License-Identifier: GPL-2.0+ 2 /* 3 * Copyright (C) 1994 - 1999, 2000, 01, 06 Ralf Baechle 4 * Copyright (C) 1995, 1996 Paul M. Antoine 5 * Copyright (C) 1998 Ulf Carlsson 6 * Copyright (C) 1999 Silicon Graphics, Inc. 7 * Kevin D. Kissell, kevink@mips.com and Carsten Langgaard, carstenl@mips.com 8 * Copyright (C) 2002, 2003, 2004, 2005, 2007 Maciej W. Rozycki 9 * Copyright (C) 2000, 2001, 2012 MIPS Technologies, Inc. All rights reserved. 10 * Copyright (C) 2014, Imagination Technologies Ltd. 11 */ 12 13 #include <common.h> 14 #include <asm/mipsregs.h> 15 #include <asm/addrspace.h> 16 #include <asm/system.h> 17 18 DECLARE_GLOBAL_DATA_PTR; 19 20 static void show_regs(const struct pt_regs *regs) 21 { 22 const int field = 2 * sizeof(unsigned long); 23 unsigned int cause = regs->cp0_cause; 24 unsigned int exccode; 25 int i; 26 27 /* 28 * Saved main processor registers 29 */ 30 for (i = 0; i < 32; ) { 31 if ((i % 4) == 0) 32 printf("$%2d :", i); 33 if (i == 0) 34 printf(" %0*lx", field, 0UL); 35 else if (i == 26 || i == 27) 36 printf(" %*s", field, ""); 37 else 38 printf(" %0*lx", field, regs->regs[i]); 39 40 i++; 41 if ((i % 4) == 0) 42 puts("\n"); 43 } 44 45 printf("Hi : %0*lx\n", field, regs->hi); 46 printf("Lo : %0*lx\n", field, regs->lo); 47 48 /* 49 * Saved cp0 registers 50 */ 51 printf("epc : %0*lx (text %0*lx)\n", field, regs->cp0_epc, 52 field, regs->cp0_epc - gd->reloc_off); 53 printf("ra : %0*lx (text %0*lx)\n", field, regs->regs[31], 54 field, regs->regs[31] - gd->reloc_off); 55 56 printf("Status: %08x\n", (uint32_t) regs->cp0_status); 57 58 exccode = (cause & CAUSEF_EXCCODE) >> CAUSEB_EXCCODE; 59 printf("Cause : %08x (ExcCode %02x)\n", cause, exccode); 60 61 if (1 <= exccode && exccode <= 5) 62 printf("BadVA : %0*lx\n", field, regs->cp0_badvaddr); 63 64 printf("PrId : %08x\n", read_c0_prid()); 65 } 66 67 void do_reserved(const struct pt_regs *regs) 68 { 69 puts("\nOoops:\n"); 70 show_regs(regs); 71 hang(); 72 } 73 74 void do_ejtag_debug(const struct pt_regs *regs) 75 { 76 const int field = 2 * sizeof(unsigned long); 77 unsigned long depc; 78 unsigned int debug; 79 80 depc = read_c0_depc(); 81 debug = read_c0_debug(); 82 83 printf("SDBBP EJTAG debug exception: c0_depc = %0*lx, DEBUG = %08x\n", 84 field, depc, debug); 85 } 86 87 static void set_handler(unsigned long offset, void *addr, unsigned long size) 88 { 89 unsigned long ebase = gd->irq_sp; 90 91 memcpy((void *)(ebase + offset), addr, size); 92 flush_cache(ebase + offset, size); 93 } 94 95 void trap_init(ulong reloc_addr) 96 { 97 unsigned long ebase = gd->irq_sp; 98 99 set_handler(0x180, &except_vec3_generic, 0x80); 100 set_handler(0x280, &except_vec_ejtag_debug, 0x80); 101 102 write_c0_ebase(ebase); 103 clear_c0_status(ST0_BEV); 104 execution_hazard_barrier(); 105 } 106