1 /* 2 * Copyright (C) 1995-1996 Gary Thomas (gdt@linuxppc.org) 3 * 4 * Modified by Cort Dougan (cort@cs.nmt.edu) 5 * and Paul Mackerras (paulus@cs.anu.edu.au) 6 * 7 * (C) Copyright 2000 8 * Wolfgang Denk, DENX Software Engineering, wd@denx.de. 9 * 10 * See file CREDITS for list of people who contributed to this 11 * project. 12 * 13 * This program is free software; you can redistribute it and/or 14 * modify it under the terms of the GNU General Public License as 15 * published by the Free Software Foundation; either version 2 of 16 * the License, or (at your option) any later version. 17 * 18 * This program is distributed in the hope that it will be useful, 19 * but WITHOUT ANY WARRANTY; without even the implied warranty of 20 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 21 * GNU General Public License for more details. 22 * 23 * You should have received a copy of the GNU General Public License 24 * along with this program; if not, write to the Free Software 25 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, 26 * MA 02111-1307 USA 27 */ 28 29 /* 30 * This file handles the architecture-dependent parts of hardware exceptions 31 */ 32 33 #include <common.h> 34 #include <command.h> 35 #include <kgdb.h> 36 #include <asm/processor.h> 37 38 DECLARE_GLOBAL_DATA_PTR; 39 40 /* Returns 0 if exception not found and fixup otherwise. */ 41 extern unsigned long search_exception_table(unsigned long); 42 43 /* 44 * End of addressable memory. This may be less than the actual 45 * amount of memory on the system if we're unable to keep all 46 * the memory mapped in. 47 */ 48 extern ulong get_effective_memsize(void); 49 #define END_OF_MEM (gd->bd->bi_memstart + get_effective_memsize()) 50 51 /* 52 * Trap & Exception support 53 */ 54 55 void 56 print_backtrace(unsigned long *sp) 57 { 58 int cnt = 0; 59 unsigned long i; 60 61 printf("Call backtrace: "); 62 while (sp) { 63 if ((uint) sp > END_OF_MEM) 64 break; 65 66 i = sp[1]; 67 if (cnt++ % 7 == 0) 68 printf("\n"); 69 printf("%08lX ", i); 70 if (cnt > 32) 71 break; 72 sp = (unsigned long *)*sp; 73 } 74 printf("\n"); 75 } 76 77 void 78 show_regs(struct pt_regs *regs) 79 { 80 int i; 81 82 printf("NIP: %08lX XER: %08lX LR: %08lX REGS:" 83 " %p TRAP: %04lx DAR: %08lX\n", 84 regs->nip, regs->xer, regs->link, regs, regs->trap, regs->dar); 85 printf("MSR: %08lx EE: %01x PR: %01x FP:" 86 " %01x ME: %01x IR/DR: %01x%01x\n", 87 regs->msr, regs->msr & MSR_EE ? 1 : 0, 88 regs->msr & MSR_PR ? 1 : 0, regs->msr & MSR_FP ? 1 : 0, 89 regs->msr & MSR_ME ? 1 : 0, regs->msr & MSR_IR ? 1 : 0, 90 regs->msr & MSR_DR ? 1 : 0); 91 92 printf("\n"); 93 for (i = 0; i < 32; i++) { 94 if ((i % 8) == 0) { 95 printf("GPR%02d: ", i); 96 } 97 98 printf("%08lX ", regs->gpr[i]); 99 if ((i % 8) == 7) { 100 printf("\n"); 101 } 102 } 103 } 104 105 106 void 107 _exception(int signr, struct pt_regs *regs) 108 { 109 show_regs(regs); 110 print_backtrace((unsigned long *)regs->gpr[1]); 111 panic("Exception in kernel pc %lx signal %d", regs->nip, signr); 112 } 113 114 void 115 MachineCheckException(struct pt_regs *regs) 116 { 117 unsigned long fixup; 118 119 /* Probing PCI using config cycles cause this exception 120 * when a device is not present. Catch it and return to 121 * the PCI exception handler. 122 */ 123 if ((fixup = search_exception_table(regs->nip)) != 0) { 124 regs->nip = fixup; 125 return; 126 } 127 128 #if defined(CONFIG_CMD_KGDB) 129 if (debugger_exception_handler && (*debugger_exception_handler) (regs)) 130 return; 131 #endif 132 133 printf("Machine check in kernel mode.\n"); 134 printf("Caused by (from msr): "); 135 printf("regs %p ", regs); 136 switch ( regs->msr & 0x001F0000) { 137 case (0x80000000>>11): 138 printf("MSS error. MSSSR0: %08x\n", mfspr(SPRN_MSSSR0)); 139 break; 140 case (0x80000000>>12): 141 printf("Machine check signal - probably due to mm fault\n" 142 "with mmu off\n"); 143 break; 144 case (0x80000000 >> 13): 145 printf("Transfer error ack signal\n"); 146 break; 147 case (0x80000000 >> 14): 148 printf("Data parity signal\n"); 149 break; 150 case (0x80000000 >> 15): 151 printf("Address parity signal\n"); 152 break; 153 default: 154 printf("Unknown values in msr\n"); 155 } 156 show_regs(regs); 157 print_backtrace((unsigned long *)regs->gpr[1]); 158 panic("machine check"); 159 } 160 161 void 162 AlignmentException(struct pt_regs *regs) 163 { 164 #if defined(CONFIG_CMD_KGDB) 165 if (debugger_exception_handler && (*debugger_exception_handler) (regs)) 166 return; 167 #endif 168 show_regs(regs); 169 print_backtrace((unsigned long *)regs->gpr[1]); 170 panic("Alignment Exception"); 171 } 172 173 void 174 ProgramCheckException(struct pt_regs *regs) 175 { 176 unsigned char *p = regs ? (unsigned char *)(regs->nip) : NULL; 177 int i, j; 178 179 #if defined(CONFIG_CMD_KGDB) 180 if (debugger_exception_handler && (*debugger_exception_handler) (regs)) 181 return; 182 #endif 183 show_regs(regs); 184 185 p = (unsigned char *)((unsigned long)p & 0xFFFFFFE0); 186 p -= 32; 187 for (i = 0; i < 256; i += 16) { 188 printf("%08x: ", (unsigned int)p + i); 189 for (j = 0; j < 16; j++) { 190 printf("%02x ", p[i + j]); 191 } 192 printf("\n"); 193 } 194 195 print_backtrace((unsigned long *)regs->gpr[1]); 196 panic("Program Check Exception"); 197 } 198 199 void 200 SoftEmuException(struct pt_regs *regs) 201 { 202 #if defined(CONFIG_CMD_KGDB) 203 if (debugger_exception_handler && (*debugger_exception_handler) (regs)) 204 return; 205 #endif 206 show_regs(regs); 207 print_backtrace((unsigned long *)regs->gpr[1]); 208 panic("Software Emulation Exception"); 209 } 210 211 void 212 UnknownException(struct pt_regs *regs) 213 { 214 #if defined(CONFIG_CMD_KGDB) 215 if (debugger_exception_handler && (*debugger_exception_handler) (regs)) 216 return; 217 #endif 218 printf("UnknownException regs@%lx\n", (ulong)regs); 219 printf("Bad trap at PC: %lx, SR: %lx, vector=%lx\n", 220 regs->nip, regs->msr, regs->trap); 221 _exception(0, regs); 222 } 223 224 /* 225 * Probe an address by reading. 226 * If not present, return -1, 227 * otherwise return 0. 228 */ 229 int 230 addr_probe(uint *addr) 231 { 232 return 0; 233 } 234