Jon Loeliger | 5c8aa97 | 2006-04-26 17:58:56 -0500 | [diff] [blame] | 1 | /* |
Jon Loeliger | 5c8aa97 | 2006-04-26 17:58:56 -0500 | [diff] [blame] | 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> |
Mike Frysinger | 629d88b | 2010-02-08 15:30:16 -0500 | [diff] [blame] | 35 | #include <kgdb.h> |
Jon Loeliger | 5c8aa97 | 2006-04-26 17:58:56 -0500 | [diff] [blame] | 36 | #include <asm/processor.h> |
| 37 | |
Wolfgang Denk | d112a2c | 2007-09-15 20:48:41 +0200 | [diff] [blame] | 38 | DECLARE_GLOBAL_DATA_PTR; |
| 39 | |
Jon Loeliger | 5c8aa97 | 2006-04-26 17:58:56 -0500 | [diff] [blame] | 40 | /* Returns 0 if exception not found and fixup otherwise. */ |
| 41 | extern unsigned long search_exception_table(unsigned long); |
| 42 | |
Becky Bruce | 6b3fbe4 | 2008-05-14 13:09:58 -0500 | [diff] [blame] | 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()) |
Jon Loeliger | 5c8aa97 | 2006-04-26 17:58:56 -0500 | [diff] [blame] | 50 | |
| 51 | /* |
| 52 | * Trap & Exception support |
| 53 | */ |
| 54 | |
Kim Phillips | e16737f | 2012-10-29 13:34:29 +0000 | [diff] [blame] | 55 | static void print_backtrace(unsigned long *sp) |
Jon Loeliger | 5c8aa97 | 2006-04-26 17:58:56 -0500 | [diff] [blame] | 56 | { |
Jon Loeliger | 5c8aa97 | 2006-04-26 17:58:56 -0500 | [diff] [blame] | 57 | int cnt = 0; |
| 58 | unsigned long i; |
| 59 | |
| 60 | printf("Call backtrace: "); |
| 61 | while (sp) { |
Jon Loeliger | a129544 | 2006-08-22 12:06:18 -0500 | [diff] [blame] | 62 | if ((uint) sp > END_OF_MEM) |
Jon Loeliger | 5c8aa97 | 2006-04-26 17:58:56 -0500 | [diff] [blame] | 63 | break; |
| 64 | |
| 65 | i = sp[1]; |
| 66 | if (cnt++ % 7 == 0) |
| 67 | printf("\n"); |
| 68 | printf("%08lX ", i); |
Jon Loeliger | a129544 | 2006-08-22 12:06:18 -0500 | [diff] [blame] | 69 | if (cnt > 32) |
| 70 | break; |
Jon Loeliger | 5c8aa97 | 2006-04-26 17:58:56 -0500 | [diff] [blame] | 71 | sp = (unsigned long *)*sp; |
| 72 | } |
| 73 | printf("\n"); |
| 74 | } |
| 75 | |
Kim Phillips | e16737f | 2012-10-29 13:34:29 +0000 | [diff] [blame] | 76 | void show_regs(struct pt_regs *regs) |
Jon Loeliger | 5c8aa97 | 2006-04-26 17:58:56 -0500 | [diff] [blame] | 77 | { |
| 78 | int i; |
| 79 | |
| 80 | printf("NIP: %08lX XER: %08lX LR: %08lX REGS:" |
| 81 | " %p TRAP: %04lx DAR: %08lX\n", |
| 82 | regs->nip, regs->xer, regs->link, regs, regs->trap, regs->dar); |
| 83 | printf("MSR: %08lx EE: %01x PR: %01x FP:" |
| 84 | " %01x ME: %01x IR/DR: %01x%01x\n", |
Jon Loeliger | a129544 | 2006-08-22 12:06:18 -0500 | [diff] [blame] | 85 | regs->msr, regs->msr & MSR_EE ? 1 : 0, |
| 86 | regs->msr & MSR_PR ? 1 : 0, regs->msr & MSR_FP ? 1 : 0, |
| 87 | regs->msr & MSR_ME ? 1 : 0, regs->msr & MSR_IR ? 1 : 0, |
| 88 | regs->msr & MSR_DR ? 1 : 0); |
Jon Loeliger | 5c8aa97 | 2006-04-26 17:58:56 -0500 | [diff] [blame] | 89 | |
| 90 | printf("\n"); |
Jon Loeliger | a129544 | 2006-08-22 12:06:18 -0500 | [diff] [blame] | 91 | for (i = 0; i < 32; i++) { |
| 92 | if ((i % 8) == 0) { |
Jon Loeliger | 5c8aa97 | 2006-04-26 17:58:56 -0500 | [diff] [blame] | 93 | printf("GPR%02d: ", i); |
| 94 | } |
| 95 | |
| 96 | printf("%08lX ", regs->gpr[i]); |
Jon Loeliger | a129544 | 2006-08-22 12:06:18 -0500 | [diff] [blame] | 97 | if ((i % 8) == 7) { |
Jon Loeliger | 5c8aa97 | 2006-04-26 17:58:56 -0500 | [diff] [blame] | 98 | printf("\n"); |
| 99 | } |
| 100 | } |
| 101 | } |
| 102 | |
| 103 | |
Kim Phillips | e16737f | 2012-10-29 13:34:29 +0000 | [diff] [blame] | 104 | static void _exception(int signr, struct pt_regs *regs) |
Jon Loeliger | 5c8aa97 | 2006-04-26 17:58:56 -0500 | [diff] [blame] | 105 | { |
| 106 | show_regs(regs); |
| 107 | print_backtrace((unsigned long *)regs->gpr[1]); |
Jon Loeliger | a129544 | 2006-08-22 12:06:18 -0500 | [diff] [blame] | 108 | panic("Exception in kernel pc %lx signal %d", regs->nip, signr); |
Jon Loeliger | 5c8aa97 | 2006-04-26 17:58:56 -0500 | [diff] [blame] | 109 | } |
| 110 | |
Kim Phillips | e16737f | 2012-10-29 13:34:29 +0000 | [diff] [blame] | 111 | void MachineCheckException(struct pt_regs *regs) |
Jon Loeliger | 5c8aa97 | 2006-04-26 17:58:56 -0500 | [diff] [blame] | 112 | { |
| 113 | unsigned long fixup; |
| 114 | |
| 115 | /* Probing PCI using config cycles cause this exception |
| 116 | * when a device is not present. Catch it and return to |
| 117 | * the PCI exception handler. |
| 118 | */ |
| 119 | if ((fixup = search_exception_table(regs->nip)) != 0) { |
| 120 | regs->nip = fixup; |
| 121 | return; |
| 122 | } |
| 123 | |
Jon Loeliger | 07d5349 | 2007-06-13 13:23:15 -0500 | [diff] [blame] | 124 | #if defined(CONFIG_CMD_KGDB) |
Jon Loeliger | a129544 | 2006-08-22 12:06:18 -0500 | [diff] [blame] | 125 | if (debugger_exception_handler && (*debugger_exception_handler) (regs)) |
Jon Loeliger | 5c8aa97 | 2006-04-26 17:58:56 -0500 | [diff] [blame] | 126 | return; |
| 127 | #endif |
| 128 | |
| 129 | printf("Machine check in kernel mode.\n"); |
| 130 | printf("Caused by (from msr): "); |
Jon Loeliger | a129544 | 2006-08-22 12:06:18 -0500 | [diff] [blame] | 131 | printf("regs %p ", regs); |
Jon Loeliger | 11c9958 | 2007-08-02 14:42:20 -0500 | [diff] [blame] | 132 | switch ( regs->msr & 0x001F0000) { |
| 133 | case (0x80000000>>11): |
| 134 | printf("MSS error. MSSSR0: %08x\n", mfspr(SPRN_MSSSR0)); |
| 135 | break; |
| 136 | case (0x80000000>>12): |
Jon Loeliger | 5c8aa97 | 2006-04-26 17:58:56 -0500 | [diff] [blame] | 137 | printf("Machine check signal - probably due to mm fault\n" |
Jon Loeliger | a129544 | 2006-08-22 12:06:18 -0500 | [diff] [blame] | 138 | "with mmu off\n"); |
Jon Loeliger | 5c8aa97 | 2006-04-26 17:58:56 -0500 | [diff] [blame] | 139 | break; |
Jon Loeliger | a129544 | 2006-08-22 12:06:18 -0500 | [diff] [blame] | 140 | case (0x80000000 >> 13): |
Jon Loeliger | 5c8aa97 | 2006-04-26 17:58:56 -0500 | [diff] [blame] | 141 | printf("Transfer error ack signal\n"); |
| 142 | break; |
Jon Loeliger | a129544 | 2006-08-22 12:06:18 -0500 | [diff] [blame] | 143 | case (0x80000000 >> 14): |
Jon Loeliger | 5c8aa97 | 2006-04-26 17:58:56 -0500 | [diff] [blame] | 144 | printf("Data parity signal\n"); |
| 145 | break; |
Jon Loeliger | a129544 | 2006-08-22 12:06:18 -0500 | [diff] [blame] | 146 | case (0x80000000 >> 15): |
Jon Loeliger | 5c8aa97 | 2006-04-26 17:58:56 -0500 | [diff] [blame] | 147 | printf("Address parity signal\n"); |
| 148 | break; |
| 149 | default: |
| 150 | printf("Unknown values in msr\n"); |
| 151 | } |
| 152 | show_regs(regs); |
| 153 | print_backtrace((unsigned long *)regs->gpr[1]); |
| 154 | panic("machine check"); |
| 155 | } |
| 156 | |
Kim Phillips | e16737f | 2012-10-29 13:34:29 +0000 | [diff] [blame] | 157 | void AlignmentException(struct pt_regs *regs) |
Jon Loeliger | 5c8aa97 | 2006-04-26 17:58:56 -0500 | [diff] [blame] | 158 | { |
Jon Loeliger | 07d5349 | 2007-06-13 13:23:15 -0500 | [diff] [blame] | 159 | #if defined(CONFIG_CMD_KGDB) |
Jon Loeliger | a129544 | 2006-08-22 12:06:18 -0500 | [diff] [blame] | 160 | if (debugger_exception_handler && (*debugger_exception_handler) (regs)) |
Jon Loeliger | 5c8aa97 | 2006-04-26 17:58:56 -0500 | [diff] [blame] | 161 | return; |
| 162 | #endif |
| 163 | show_regs(regs); |
| 164 | print_backtrace((unsigned long *)regs->gpr[1]); |
| 165 | panic("Alignment Exception"); |
| 166 | } |
| 167 | |
Kim Phillips | e16737f | 2012-10-29 13:34:29 +0000 | [diff] [blame] | 168 | void ProgramCheckException(struct pt_regs *regs) |
Jon Loeliger | 5c8aa97 | 2006-04-26 17:58:56 -0500 | [diff] [blame] | 169 | { |
| 170 | unsigned char *p = regs ? (unsigned char *)(regs->nip) : NULL; |
| 171 | int i, j; |
| 172 | |
Jon Loeliger | 07d5349 | 2007-06-13 13:23:15 -0500 | [diff] [blame] | 173 | #if defined(CONFIG_CMD_KGDB) |
Jon Loeliger | a129544 | 2006-08-22 12:06:18 -0500 | [diff] [blame] | 174 | if (debugger_exception_handler && (*debugger_exception_handler) (regs)) |
Jon Loeliger | 5c8aa97 | 2006-04-26 17:58:56 -0500 | [diff] [blame] | 175 | return; |
| 176 | #endif |
| 177 | show_regs(regs); |
| 178 | |
Jon Loeliger | a129544 | 2006-08-22 12:06:18 -0500 | [diff] [blame] | 179 | p = (unsigned char *)((unsigned long)p & 0xFFFFFFE0); |
Jon Loeliger | 5c8aa97 | 2006-04-26 17:58:56 -0500 | [diff] [blame] | 180 | p -= 32; |
Jon Loeliger | a129544 | 2006-08-22 12:06:18 -0500 | [diff] [blame] | 181 | for (i = 0; i < 256; i += 16) { |
| 182 | printf("%08x: ", (unsigned int)p + i); |
Jon Loeliger | 5c8aa97 | 2006-04-26 17:58:56 -0500 | [diff] [blame] | 183 | for (j = 0; j < 16; j++) { |
Jon Loeliger | a129544 | 2006-08-22 12:06:18 -0500 | [diff] [blame] | 184 | printf("%02x ", p[i + j]); |
Jon Loeliger | 5c8aa97 | 2006-04-26 17:58:56 -0500 | [diff] [blame] | 185 | } |
| 186 | printf("\n"); |
| 187 | } |
| 188 | |
| 189 | print_backtrace((unsigned long *)regs->gpr[1]); |
| 190 | panic("Program Check Exception"); |
| 191 | } |
| 192 | |
Kim Phillips | e16737f | 2012-10-29 13:34:29 +0000 | [diff] [blame] | 193 | void SoftEmuException(struct pt_regs *regs) |
Jon Loeliger | 5c8aa97 | 2006-04-26 17:58:56 -0500 | [diff] [blame] | 194 | { |
Jon Loeliger | 07d5349 | 2007-06-13 13:23:15 -0500 | [diff] [blame] | 195 | #if defined(CONFIG_CMD_KGDB) |
Jon Loeliger | a129544 | 2006-08-22 12:06:18 -0500 | [diff] [blame] | 196 | if (debugger_exception_handler && (*debugger_exception_handler) (regs)) |
Jon Loeliger | 5c8aa97 | 2006-04-26 17:58:56 -0500 | [diff] [blame] | 197 | return; |
| 198 | #endif |
| 199 | show_regs(regs); |
| 200 | print_backtrace((unsigned long *)regs->gpr[1]); |
| 201 | panic("Software Emulation Exception"); |
| 202 | } |
| 203 | |
Kim Phillips | e16737f | 2012-10-29 13:34:29 +0000 | [diff] [blame] | 204 | void UnknownException(struct pt_regs *regs) |
Jon Loeliger | 5c8aa97 | 2006-04-26 17:58:56 -0500 | [diff] [blame] | 205 | { |
Jon Loeliger | 07d5349 | 2007-06-13 13:23:15 -0500 | [diff] [blame] | 206 | #if defined(CONFIG_CMD_KGDB) |
Jon Loeliger | a129544 | 2006-08-22 12:06:18 -0500 | [diff] [blame] | 207 | if (debugger_exception_handler && (*debugger_exception_handler) (regs)) |
Jon Loeliger | 5c8aa97 | 2006-04-26 17:58:56 -0500 | [diff] [blame] | 208 | return; |
| 209 | #endif |
Wolfgang Denk | 12cec0a | 2008-07-11 01:16:00 +0200 | [diff] [blame] | 210 | printf("UnknownException regs@%lx\n", (ulong)regs); |
Jon Loeliger | 5c8aa97 | 2006-04-26 17:58:56 -0500 | [diff] [blame] | 211 | printf("Bad trap at PC: %lx, SR: %lx, vector=%lx\n", |
| 212 | regs->nip, regs->msr, regs->trap); |
| 213 | _exception(0, regs); |
| 214 | } |
| 215 | |
Jon Loeliger | a129544 | 2006-08-22 12:06:18 -0500 | [diff] [blame] | 216 | /* |
| 217 | * Probe an address by reading. |
| 218 | * If not present, return -1, |
| 219 | * otherwise return 0. |
Jon Loeliger | 5c8aa97 | 2006-04-26 17:58:56 -0500 | [diff] [blame] | 220 | */ |
Kim Phillips | e16737f | 2012-10-29 13:34:29 +0000 | [diff] [blame] | 221 | int addr_probe(uint *addr) |
Jon Loeliger | 5c8aa97 | 2006-04-26 17:58:56 -0500 | [diff] [blame] | 222 | { |
Jon Loeliger | 5c8aa97 | 2006-04-26 17:58:56 -0500 | [diff] [blame] | 223 | return 0; |
| 224 | } |