Haavard Skinnemoen | 5f97f7f | 2006-09-25 23:32:13 -0700 | [diff] [blame] | 1 | /* |
| 2 | * Copyright (C) 2004-2006 Atmel Corporation |
| 3 | * |
| 4 | * This program is free software; you can redistribute it and/or modify |
| 5 | * it under the terms of the GNU General Public License version 2 as |
| 6 | * published by the Free Software Foundation. |
| 7 | */ |
Haavard Skinnemoen | 623b035 | 2007-03-13 17:59:11 +0100 | [diff] [blame] | 8 | |
| 9 | #include <linux/bug.h> |
Haavard Skinnemoen | 5f97f7f | 2006-09-25 23:32:13 -0700 | [diff] [blame] | 10 | #include <linux/init.h> |
Haavard Skinnemoen | 5f97f7f | 2006-09-25 23:32:13 -0700 | [diff] [blame] | 11 | #include <linux/kallsyms.h> |
Haavard Skinnemoen | e7ba176 | 2007-10-10 14:58:29 +0200 | [diff] [blame] | 12 | #include <linux/kdebug.h> |
Haavard Skinnemoen | 623b035 | 2007-03-13 17:59:11 +0100 | [diff] [blame] | 13 | #include <linux/module.h> |
Haavard Skinnemoen | 5f97f7f | 2006-09-25 23:32:13 -0700 | [diff] [blame] | 14 | #include <linux/notifier.h> |
Haavard Skinnemoen | 623b035 | 2007-03-13 17:59:11 +0100 | [diff] [blame] | 15 | #include <linux/sched.h> |
| 16 | #include <linux/uaccess.h> |
Haavard Skinnemoen | 5f97f7f | 2006-09-25 23:32:13 -0700 | [diff] [blame] | 17 | |
Haavard Skinnemoen | 5f97f7f | 2006-09-25 23:32:13 -0700 | [diff] [blame] | 18 | #include <asm/addrspace.h> |
Haavard Skinnemoen | 5f97f7f | 2006-09-25 23:32:13 -0700 | [diff] [blame] | 19 | #include <asm/mmu_context.h> |
Haavard Skinnemoen | 623b035 | 2007-03-13 17:59:11 +0100 | [diff] [blame] | 20 | #include <asm/ocd.h> |
| 21 | #include <asm/sysreg.h> |
| 22 | #include <asm/traps.h> |
Haavard Skinnemoen | 5f97f7f | 2006-09-25 23:32:13 -0700 | [diff] [blame] | 23 | |
Haavard Skinnemoen | 5f97f7f | 2006-09-25 23:32:13 -0700 | [diff] [blame] | 24 | static DEFINE_SPINLOCK(die_lock); |
| 25 | |
Haavard Skinnemoen | 623b035 | 2007-03-13 17:59:11 +0100 | [diff] [blame] | 26 | void NORET_TYPE die(const char *str, struct pt_regs *regs, long err) |
Haavard Skinnemoen | 5f97f7f | 2006-09-25 23:32:13 -0700 | [diff] [blame] | 27 | { |
Haavard Skinnemoen | 5f97f7f | 2006-09-25 23:32:13 -0700 | [diff] [blame] | 28 | static int die_counter; |
| 29 | |
| 30 | console_verbose(); |
| 31 | spin_lock_irq(&die_lock); |
| 32 | bust_spinlocks(1); |
| 33 | |
Haavard Skinnemoen | 623b035 | 2007-03-13 17:59:11 +0100 | [diff] [blame] | 34 | printk(KERN_ALERT "Oops: %s, sig: %ld [#%d]\n" KERN_EMERG, |
| 35 | str, err, ++die_counter); |
| 36 | #ifdef CONFIG_PREEMPT |
| 37 | printk("PREEMPT "); |
| 38 | #endif |
| 39 | #ifdef CONFIG_FRAME_POINTER |
| 40 | printk("FRAME_POINTER "); |
| 41 | #endif |
| 42 | if (current_cpu_data.features & AVR32_FEATURE_OCD) { |
Haavard Skinnemoen | 8dfe8f2 | 2007-11-27 13:31:20 +0100 | [diff] [blame] | 43 | unsigned long did = ocd_read(DID); |
Haavard Skinnemoen | 623b035 | 2007-03-13 17:59:11 +0100 | [diff] [blame] | 44 | printk("chip: 0x%03lx:0x%04lx rev %lu\n", |
| 45 | (did >> 1) & 0x7ff, |
| 46 | (did >> 12) & 0x7fff, |
| 47 | (did >> 28) & 0xf); |
| 48 | } else { |
| 49 | printk("cpu: arch %u r%u / core %u r%u\n", |
| 50 | current_cpu_data.arch_type, |
| 51 | current_cpu_data.arch_revision, |
| 52 | current_cpu_data.cpu_type, |
| 53 | current_cpu_data.cpu_revision); |
Haavard Skinnemoen | 5f97f7f | 2006-09-25 23:32:13 -0700 | [diff] [blame] | 54 | } |
| 55 | |
Haavard Skinnemoen | 623b035 | 2007-03-13 17:59:11 +0100 | [diff] [blame] | 56 | print_modules(); |
| 57 | show_regs_log_lvl(regs, KERN_EMERG); |
| 58 | show_stack_log_lvl(current, regs->sp, regs, KERN_EMERG); |
Haavard Skinnemoen | 5f97f7f | 2006-09-25 23:32:13 -0700 | [diff] [blame] | 59 | bust_spinlocks(0); |
Pavel Emelianov | bcdcd8e | 2007-07-17 04:03:42 -0700 | [diff] [blame] | 60 | add_taint(TAINT_DIE); |
Haavard Skinnemoen | 5f97f7f | 2006-09-25 23:32:13 -0700 | [diff] [blame] | 61 | spin_unlock_irq(&die_lock); |
Haavard Skinnemoen | 623b035 | 2007-03-13 17:59:11 +0100 | [diff] [blame] | 62 | |
| 63 | if (in_interrupt()) |
| 64 | panic("Fatal exception in interrupt"); |
| 65 | |
| 66 | if (panic_on_oops) |
| 67 | panic("Fatal exception"); |
| 68 | |
| 69 | do_exit(err); |
Haavard Skinnemoen | 5f97f7f | 2006-09-25 23:32:13 -0700 | [diff] [blame] | 70 | } |
| 71 | |
Haavard Skinnemoen | 623b035 | 2007-03-13 17:59:11 +0100 | [diff] [blame] | 72 | void _exception(long signr, struct pt_regs *regs, int code, |
| 73 | unsigned long addr) |
Haavard Skinnemoen | 5f97f7f | 2006-09-25 23:32:13 -0700 | [diff] [blame] | 74 | { |
Haavard Skinnemoen | 623b035 | 2007-03-13 17:59:11 +0100 | [diff] [blame] | 75 | siginfo_t info; |
| 76 | |
Haavard Skinnemoen | 5f97f7f | 2006-09-25 23:32:13 -0700 | [diff] [blame] | 77 | if (!user_mode(regs)) |
Haavard Skinnemoen | 623b035 | 2007-03-13 17:59:11 +0100 | [diff] [blame] | 78 | die("Unhandled exception in kernel mode", regs, signr); |
| 79 | |
| 80 | memset(&info, 0, sizeof(info)); |
| 81 | info.si_signo = signr; |
| 82 | info.si_code = code; |
| 83 | info.si_addr = (void __user *)addr; |
| 84 | force_sig_info(signr, &info, current); |
| 85 | |
| 86 | /* |
| 87 | * Init gets no signals that it doesn't have a handler for. |
| 88 | * That's all very well, but if it has caused a synchronous |
| 89 | * exception and we ignore the resulting signal, it will just |
| 90 | * generate the same exception over and over again and we get |
| 91 | * nowhere. Better to kill it and let the kernel panic. |
| 92 | */ |
Serge E. Hallyn | b460cbc | 2007-10-18 23:39:52 -0700 | [diff] [blame] | 93 | if (is_global_init(current)) { |
Haavard Skinnemoen | 623b035 | 2007-03-13 17:59:11 +0100 | [diff] [blame] | 94 | __sighandler_t handler; |
| 95 | |
| 96 | spin_lock_irq(¤t->sighand->siglock); |
| 97 | handler = current->sighand->action[signr-1].sa.sa_handler; |
| 98 | spin_unlock_irq(¤t->sighand->siglock); |
| 99 | if (handler == SIG_DFL) { |
| 100 | /* init has generated a synchronous exception |
| 101 | and it doesn't have a handler for the signal */ |
| 102 | printk(KERN_CRIT "init has generated signal %ld " |
| 103 | "but has no handler for it\n", signr); |
| 104 | do_exit(signr); |
| 105 | } |
| 106 | } |
Haavard Skinnemoen | 5f97f7f | 2006-09-25 23:32:13 -0700 | [diff] [blame] | 107 | } |
| 108 | |
| 109 | asmlinkage void do_nmi(unsigned long ecr, struct pt_regs *regs) |
| 110 | { |
Haavard Skinnemoen | e7ba176 | 2007-10-10 14:58:29 +0200 | [diff] [blame] | 111 | int ret; |
| 112 | |
| 113 | nmi_enter(); |
| 114 | |
| 115 | ret = notify_die(DIE_NMI, "NMI", regs, 0, ecr, SIGINT); |
| 116 | switch (ret) { |
| 117 | case NOTIFY_OK: |
| 118 | case NOTIFY_STOP: |
| 119 | return; |
| 120 | case NOTIFY_BAD: |
| 121 | die("Fatal Non-Maskable Interrupt", regs, SIGINT); |
| 122 | default: |
| 123 | break; |
| 124 | } |
| 125 | |
| 126 | printk(KERN_ALERT "Got NMI, but nobody cared. Disabling...\n"); |
| 127 | nmi_disable(); |
Haavard Skinnemoen | 5f97f7f | 2006-09-25 23:32:13 -0700 | [diff] [blame] | 128 | } |
| 129 | |
| 130 | asmlinkage void do_critical_exception(unsigned long ecr, struct pt_regs *regs) |
| 131 | { |
Haavard Skinnemoen | 623b035 | 2007-03-13 17:59:11 +0100 | [diff] [blame] | 132 | die("Critical exception", regs, SIGKILL); |
Haavard Skinnemoen | 5f97f7f | 2006-09-25 23:32:13 -0700 | [diff] [blame] | 133 | } |
| 134 | |
| 135 | asmlinkage void do_address_exception(unsigned long ecr, struct pt_regs *regs) |
| 136 | { |
Haavard Skinnemoen | 623b035 | 2007-03-13 17:59:11 +0100 | [diff] [blame] | 137 | _exception(SIGBUS, regs, BUS_ADRALN, regs->pc); |
Haavard Skinnemoen | 5f97f7f | 2006-09-25 23:32:13 -0700 | [diff] [blame] | 138 | } |
| 139 | |
| 140 | /* This way of handling undefined instructions is stolen from ARM */ |
| 141 | static LIST_HEAD(undef_hook); |
Thomas Gleixner | e89b064 | 2007-04-29 16:10:34 +0000 | [diff] [blame] | 142 | static DEFINE_SPINLOCK(undef_lock); |
Haavard Skinnemoen | 5f97f7f | 2006-09-25 23:32:13 -0700 | [diff] [blame] | 143 | |
| 144 | void register_undef_hook(struct undef_hook *hook) |
| 145 | { |
| 146 | spin_lock_irq(&undef_lock); |
| 147 | list_add(&hook->node, &undef_hook); |
| 148 | spin_unlock_irq(&undef_lock); |
| 149 | } |
| 150 | |
| 151 | void unregister_undef_hook(struct undef_hook *hook) |
| 152 | { |
| 153 | spin_lock_irq(&undef_lock); |
| 154 | list_del(&hook->node); |
| 155 | spin_unlock_irq(&undef_lock); |
| 156 | } |
| 157 | |
| 158 | static int do_cop_absent(u32 insn) |
| 159 | { |
| 160 | int cop_nr; |
| 161 | u32 cpucr; |
Haavard Skinnemoen | 623b035 | 2007-03-13 17:59:11 +0100 | [diff] [blame] | 162 | |
| 163 | if ((insn & 0xfdf00000) == 0xf1900000) |
Haavard Skinnemoen | 5f97f7f | 2006-09-25 23:32:13 -0700 | [diff] [blame] | 164 | /* LDC0 */ |
| 165 | cop_nr = 0; |
| 166 | else |
| 167 | cop_nr = (insn >> 13) & 0x7; |
| 168 | |
| 169 | /* Try enabling the coprocessor */ |
| 170 | cpucr = sysreg_read(CPUCR); |
| 171 | cpucr |= (1 << (24 + cop_nr)); |
| 172 | sysreg_write(CPUCR, cpucr); |
| 173 | |
| 174 | cpucr = sysreg_read(CPUCR); |
Haavard Skinnemoen | 623b035 | 2007-03-13 17:59:11 +0100 | [diff] [blame] | 175 | if (!(cpucr & (1 << (24 + cop_nr)))) |
| 176 | return -ENODEV; |
Haavard Skinnemoen | 5f97f7f | 2006-09-25 23:32:13 -0700 | [diff] [blame] | 177 | |
| 178 | return 0; |
| 179 | } |
| 180 | |
Haavard Skinnemoen | 623b035 | 2007-03-13 17:59:11 +0100 | [diff] [blame] | 181 | int is_valid_bugaddr(unsigned long pc) |
Haavard Skinnemoen | 5f97f7f | 2006-09-25 23:32:13 -0700 | [diff] [blame] | 182 | { |
Haavard Skinnemoen | 623b035 | 2007-03-13 17:59:11 +0100 | [diff] [blame] | 183 | unsigned short opcode; |
Haavard Skinnemoen | 5f97f7f | 2006-09-25 23:32:13 -0700 | [diff] [blame] | 184 | |
Haavard Skinnemoen | 623b035 | 2007-03-13 17:59:11 +0100 | [diff] [blame] | 185 | if (pc < PAGE_OFFSET) |
| 186 | return 0; |
| 187 | if (probe_kernel_address((u16 *)pc, opcode)) |
| 188 | return 0; |
Haavard Skinnemoen | 5f97f7f | 2006-09-25 23:32:13 -0700 | [diff] [blame] | 189 | |
Haavard Skinnemoen | 623b035 | 2007-03-13 17:59:11 +0100 | [diff] [blame] | 190 | return opcode == AVR32_BUG_OPCODE; |
Haavard Skinnemoen | 5f97f7f | 2006-09-25 23:32:13 -0700 | [diff] [blame] | 191 | } |
Haavard Skinnemoen | 5f97f7f | 2006-09-25 23:32:13 -0700 | [diff] [blame] | 192 | |
| 193 | asmlinkage void do_illegal_opcode(unsigned long ecr, struct pt_regs *regs) |
| 194 | { |
| 195 | u32 insn; |
| 196 | struct undef_hook *hook; |
Haavard Skinnemoen | 5f97f7f | 2006-09-25 23:32:13 -0700 | [diff] [blame] | 197 | void __user *pc; |
Haavard Skinnemoen | 623b035 | 2007-03-13 17:59:11 +0100 | [diff] [blame] | 198 | long code; |
Haavard Skinnemoen | 5f97f7f | 2006-09-25 23:32:13 -0700 | [diff] [blame] | 199 | |
Haavard Skinnemoen | 623b035 | 2007-03-13 17:59:11 +0100 | [diff] [blame] | 200 | if (!user_mode(regs) && (ecr == ECR_ILLEGAL_OPCODE)) { |
| 201 | enum bug_trap_type type; |
| 202 | |
Heiko Carstens | 608e261 | 2007-07-15 23:41:39 -0700 | [diff] [blame] | 203 | type = report_bug(regs->pc, regs); |
Haavard Skinnemoen | 623b035 | 2007-03-13 17:59:11 +0100 | [diff] [blame] | 204 | switch (type) { |
| 205 | case BUG_TRAP_TYPE_NONE: |
| 206 | break; |
| 207 | case BUG_TRAP_TYPE_WARN: |
| 208 | regs->pc += 2; |
| 209 | return; |
| 210 | case BUG_TRAP_TYPE_BUG: |
| 211 | die("Kernel BUG", regs, SIGKILL); |
| 212 | } |
| 213 | } |
Haavard Skinnemoen | 5f97f7f | 2006-09-25 23:32:13 -0700 | [diff] [blame] | 214 | |
| 215 | local_irq_enable(); |
| 216 | |
Haavard Skinnemoen | 623b035 | 2007-03-13 17:59:11 +0100 | [diff] [blame] | 217 | if (user_mode(regs)) { |
| 218 | pc = (void __user *)instruction_pointer(regs); |
| 219 | if (get_user(insn, (u32 __user *)pc)) |
| 220 | goto invalid_area; |
Haavard Skinnemoen | 5f97f7f | 2006-09-25 23:32:13 -0700 | [diff] [blame] | 221 | |
Haavard Skinnemoen | 623b035 | 2007-03-13 17:59:11 +0100 | [diff] [blame] | 222 | if (ecr == ECR_COPROC_ABSENT && !do_cop_absent(insn)) |
Haavard Skinnemoen | 5f97f7f | 2006-09-25 23:32:13 -0700 | [diff] [blame] | 223 | return; |
Haavard Skinnemoen | 5f97f7f | 2006-09-25 23:32:13 -0700 | [diff] [blame] | 224 | |
Haavard Skinnemoen | 623b035 | 2007-03-13 17:59:11 +0100 | [diff] [blame] | 225 | spin_lock_irq(&undef_lock); |
| 226 | list_for_each_entry(hook, &undef_hook, node) { |
| 227 | if ((insn & hook->insn_mask) == hook->insn_val) { |
| 228 | if (hook->fn(regs, insn) == 0) { |
| 229 | spin_unlock_irq(&undef_lock); |
| 230 | return; |
| 231 | } |
Haavard Skinnemoen | 5f97f7f | 2006-09-25 23:32:13 -0700 | [diff] [blame] | 232 | } |
| 233 | } |
Haavard Skinnemoen | 623b035 | 2007-03-13 17:59:11 +0100 | [diff] [blame] | 234 | spin_unlock_irq(&undef_lock); |
Haavard Skinnemoen | 5f97f7f | 2006-09-25 23:32:13 -0700 | [diff] [blame] | 235 | } |
Haavard Skinnemoen | 5f97f7f | 2006-09-25 23:32:13 -0700 | [diff] [blame] | 236 | |
Haavard Skinnemoen | 5f97f7f | 2006-09-25 23:32:13 -0700 | [diff] [blame] | 237 | switch (ecr) { |
Haavard Skinnemoen | 5f97f7f | 2006-09-25 23:32:13 -0700 | [diff] [blame] | 238 | case ECR_PRIVILEGE_VIOLATION: |
Haavard Skinnemoen | 623b035 | 2007-03-13 17:59:11 +0100 | [diff] [blame] | 239 | code = ILL_PRVOPC; |
Haavard Skinnemoen | 5f97f7f | 2006-09-25 23:32:13 -0700 | [diff] [blame] | 240 | break; |
| 241 | case ECR_COPROC_ABSENT: |
Haavard Skinnemoen | 623b035 | 2007-03-13 17:59:11 +0100 | [diff] [blame] | 242 | code = ILL_COPROC; |
Haavard Skinnemoen | 5f97f7f | 2006-09-25 23:32:13 -0700 | [diff] [blame] | 243 | break; |
| 244 | default: |
Haavard Skinnemoen | 623b035 | 2007-03-13 17:59:11 +0100 | [diff] [blame] | 245 | code = ILL_ILLOPC; |
| 246 | break; |
Haavard Skinnemoen | 5f97f7f | 2006-09-25 23:32:13 -0700 | [diff] [blame] | 247 | } |
| 248 | |
Haavard Skinnemoen | 623b035 | 2007-03-13 17:59:11 +0100 | [diff] [blame] | 249 | _exception(SIGILL, regs, code, regs->pc); |
Haavard Skinnemoen | 5f97f7f | 2006-09-25 23:32:13 -0700 | [diff] [blame] | 250 | return; |
| 251 | |
Haavard Skinnemoen | 623b035 | 2007-03-13 17:59:11 +0100 | [diff] [blame] | 252 | invalid_area: |
| 253 | _exception(SIGSEGV, regs, SEGV_MAPERR, regs->pc); |
Haavard Skinnemoen | 5f97f7f | 2006-09-25 23:32:13 -0700 | [diff] [blame] | 254 | } |
| 255 | |
| 256 | asmlinkage void do_fpe(unsigned long ecr, struct pt_regs *regs) |
| 257 | { |
Haavard Skinnemoen | 623b035 | 2007-03-13 17:59:11 +0100 | [diff] [blame] | 258 | /* We have no FPU yet */ |
| 259 | _exception(SIGILL, regs, ILL_COPROC, regs->pc); |
Haavard Skinnemoen | 5f97f7f | 2006-09-25 23:32:13 -0700 | [diff] [blame] | 260 | } |
| 261 | |
| 262 | |
| 263 | void __init trap_init(void) |
| 264 | { |
| 265 | |
| 266 | } |