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Haavard Skinnemoen5f97f7f2006-09-25 23:32:13 -07001/*
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 Skinnemoen623b0352007-03-13 17:59:11 +01008
9#include <linux/bug.h>
Haavard Skinnemoen5f97f7f2006-09-25 23:32:13 -070010#include <linux/init.h>
Haavard Skinnemoen5f97f7f2006-09-25 23:32:13 -070011#include <linux/kallsyms.h>
Haavard Skinnemoene7ba1762007-10-10 14:58:29 +020012#include <linux/kdebug.h>
Haavard Skinnemoen623b0352007-03-13 17:59:11 +010013#include <linux/module.h>
Haavard Skinnemoen5f97f7f2006-09-25 23:32:13 -070014#include <linux/notifier.h>
Haavard Skinnemoen623b0352007-03-13 17:59:11 +010015#include <linux/sched.h>
16#include <linux/uaccess.h>
Haavard Skinnemoen5f97f7f2006-09-25 23:32:13 -070017
Haavard Skinnemoen5f97f7f2006-09-25 23:32:13 -070018#include <asm/addrspace.h>
Haavard Skinnemoen5f97f7f2006-09-25 23:32:13 -070019#include <asm/mmu_context.h>
Haavard Skinnemoen623b0352007-03-13 17:59:11 +010020#include <asm/ocd.h>
21#include <asm/sysreg.h>
22#include <asm/traps.h>
Haavard Skinnemoen5f97f7f2006-09-25 23:32:13 -070023
Haavard Skinnemoen5f97f7f2006-09-25 23:32:13 -070024static DEFINE_SPINLOCK(die_lock);
25
Haavard Skinnemoen623b0352007-03-13 17:59:11 +010026void NORET_TYPE die(const char *str, struct pt_regs *regs, long err)
Haavard Skinnemoen5f97f7f2006-09-25 23:32:13 -070027{
Haavard Skinnemoen5f97f7f2006-09-25 23:32:13 -070028 static int die_counter;
29
30 console_verbose();
31 spin_lock_irq(&die_lock);
32 bust_spinlocks(1);
33
Haavard Skinnemoen623b0352007-03-13 17:59:11 +010034 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 Skinnemoen8dfe8f22007-11-27 13:31:20 +010043 unsigned long did = ocd_read(DID);
Haavard Skinnemoen623b0352007-03-13 17:59:11 +010044 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 Skinnemoen5f97f7f2006-09-25 23:32:13 -070054 }
55
Haavard Skinnemoen623b0352007-03-13 17:59:11 +010056 print_modules();
57 show_regs_log_lvl(regs, KERN_EMERG);
58 show_stack_log_lvl(current, regs->sp, regs, KERN_EMERG);
Haavard Skinnemoen5f97f7f2006-09-25 23:32:13 -070059 bust_spinlocks(0);
Pavel Emelianovbcdcd8e2007-07-17 04:03:42 -070060 add_taint(TAINT_DIE);
Haavard Skinnemoen5f97f7f2006-09-25 23:32:13 -070061 spin_unlock_irq(&die_lock);
Haavard Skinnemoen623b0352007-03-13 17:59:11 +010062
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 Skinnemoen5f97f7f2006-09-25 23:32:13 -070070}
71
Haavard Skinnemoen623b0352007-03-13 17:59:11 +010072void _exception(long signr, struct pt_regs *regs, int code,
73 unsigned long addr)
Haavard Skinnemoen5f97f7f2006-09-25 23:32:13 -070074{
Haavard Skinnemoen623b0352007-03-13 17:59:11 +010075 siginfo_t info;
76
Haavard Skinnemoen5f97f7f2006-09-25 23:32:13 -070077 if (!user_mode(regs))
Haavard Skinnemoen623b0352007-03-13 17:59:11 +010078 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. Hallynb460cbc2007-10-18 23:39:52 -070093 if (is_global_init(current)) {
Haavard Skinnemoen623b0352007-03-13 17:59:11 +010094 __sighandler_t handler;
95
96 spin_lock_irq(&current->sighand->siglock);
97 handler = current->sighand->action[signr-1].sa.sa_handler;
98 spin_unlock_irq(&current->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 Skinnemoen5f97f7f2006-09-25 23:32:13 -0700107}
108
109asmlinkage void do_nmi(unsigned long ecr, struct pt_regs *regs)
110{
Haavard Skinnemoene7ba1762007-10-10 14:58:29 +0200111 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 Skinnemoen5f97f7f2006-09-25 23:32:13 -0700128}
129
130asmlinkage void do_critical_exception(unsigned long ecr, struct pt_regs *regs)
131{
Haavard Skinnemoen623b0352007-03-13 17:59:11 +0100132 die("Critical exception", regs, SIGKILL);
Haavard Skinnemoen5f97f7f2006-09-25 23:32:13 -0700133}
134
135asmlinkage void do_address_exception(unsigned long ecr, struct pt_regs *regs)
136{
Haavard Skinnemoen623b0352007-03-13 17:59:11 +0100137 _exception(SIGBUS, regs, BUS_ADRALN, regs->pc);
Haavard Skinnemoen5f97f7f2006-09-25 23:32:13 -0700138}
139
140/* This way of handling undefined instructions is stolen from ARM */
141static LIST_HEAD(undef_hook);
Thomas Gleixnere89b0642007-04-29 16:10:34 +0000142static DEFINE_SPINLOCK(undef_lock);
Haavard Skinnemoen5f97f7f2006-09-25 23:32:13 -0700143
144void 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
151void 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
158static int do_cop_absent(u32 insn)
159{
160 int cop_nr;
161 u32 cpucr;
Haavard Skinnemoen623b0352007-03-13 17:59:11 +0100162
163 if ((insn & 0xfdf00000) == 0xf1900000)
Haavard Skinnemoen5f97f7f2006-09-25 23:32:13 -0700164 /* 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 Skinnemoen623b0352007-03-13 17:59:11 +0100175 if (!(cpucr & (1 << (24 + cop_nr))))
176 return -ENODEV;
Haavard Skinnemoen5f97f7f2006-09-25 23:32:13 -0700177
178 return 0;
179}
180
Haavard Skinnemoen623b0352007-03-13 17:59:11 +0100181int is_valid_bugaddr(unsigned long pc)
Haavard Skinnemoen5f97f7f2006-09-25 23:32:13 -0700182{
Haavard Skinnemoen623b0352007-03-13 17:59:11 +0100183 unsigned short opcode;
Haavard Skinnemoen5f97f7f2006-09-25 23:32:13 -0700184
Haavard Skinnemoen623b0352007-03-13 17:59:11 +0100185 if (pc < PAGE_OFFSET)
186 return 0;
187 if (probe_kernel_address((u16 *)pc, opcode))
188 return 0;
Haavard Skinnemoen5f97f7f2006-09-25 23:32:13 -0700189
Haavard Skinnemoen623b0352007-03-13 17:59:11 +0100190 return opcode == AVR32_BUG_OPCODE;
Haavard Skinnemoen5f97f7f2006-09-25 23:32:13 -0700191}
Haavard Skinnemoen5f97f7f2006-09-25 23:32:13 -0700192
193asmlinkage void do_illegal_opcode(unsigned long ecr, struct pt_regs *regs)
194{
195 u32 insn;
196 struct undef_hook *hook;
Haavard Skinnemoen5f97f7f2006-09-25 23:32:13 -0700197 void __user *pc;
Haavard Skinnemoen623b0352007-03-13 17:59:11 +0100198 long code;
Haavard Skinnemoen5f97f7f2006-09-25 23:32:13 -0700199
Haavard Skinnemoen623b0352007-03-13 17:59:11 +0100200 if (!user_mode(regs) && (ecr == ECR_ILLEGAL_OPCODE)) {
201 enum bug_trap_type type;
202
Heiko Carstens608e2612007-07-15 23:41:39 -0700203 type = report_bug(regs->pc, regs);
Haavard Skinnemoen623b0352007-03-13 17:59:11 +0100204 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 Skinnemoen5f97f7f2006-09-25 23:32:13 -0700214
215 local_irq_enable();
216
Haavard Skinnemoen623b0352007-03-13 17:59:11 +0100217 if (user_mode(regs)) {
218 pc = (void __user *)instruction_pointer(regs);
219 if (get_user(insn, (u32 __user *)pc))
220 goto invalid_area;
Haavard Skinnemoen5f97f7f2006-09-25 23:32:13 -0700221
Haavard Skinnemoen623b0352007-03-13 17:59:11 +0100222 if (ecr == ECR_COPROC_ABSENT && !do_cop_absent(insn))
Haavard Skinnemoen5f97f7f2006-09-25 23:32:13 -0700223 return;
Haavard Skinnemoen5f97f7f2006-09-25 23:32:13 -0700224
Haavard Skinnemoen623b0352007-03-13 17:59:11 +0100225 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 Skinnemoen5f97f7f2006-09-25 23:32:13 -0700232 }
233 }
Haavard Skinnemoen623b0352007-03-13 17:59:11 +0100234 spin_unlock_irq(&undef_lock);
Haavard Skinnemoen5f97f7f2006-09-25 23:32:13 -0700235 }
Haavard Skinnemoen5f97f7f2006-09-25 23:32:13 -0700236
Haavard Skinnemoen5f97f7f2006-09-25 23:32:13 -0700237 switch (ecr) {
Haavard Skinnemoen5f97f7f2006-09-25 23:32:13 -0700238 case ECR_PRIVILEGE_VIOLATION:
Haavard Skinnemoen623b0352007-03-13 17:59:11 +0100239 code = ILL_PRVOPC;
Haavard Skinnemoen5f97f7f2006-09-25 23:32:13 -0700240 break;
241 case ECR_COPROC_ABSENT:
Haavard Skinnemoen623b0352007-03-13 17:59:11 +0100242 code = ILL_COPROC;
Haavard Skinnemoen5f97f7f2006-09-25 23:32:13 -0700243 break;
244 default:
Haavard Skinnemoen623b0352007-03-13 17:59:11 +0100245 code = ILL_ILLOPC;
246 break;
Haavard Skinnemoen5f97f7f2006-09-25 23:32:13 -0700247 }
248
Haavard Skinnemoen623b0352007-03-13 17:59:11 +0100249 _exception(SIGILL, regs, code, regs->pc);
Haavard Skinnemoen5f97f7f2006-09-25 23:32:13 -0700250 return;
251
Haavard Skinnemoen623b0352007-03-13 17:59:11 +0100252invalid_area:
253 _exception(SIGSEGV, regs, SEGV_MAPERR, regs->pc);
Haavard Skinnemoen5f97f7f2006-09-25 23:32:13 -0700254}
255
256asmlinkage void do_fpe(unsigned long ecr, struct pt_regs *regs)
257{
Haavard Skinnemoen623b0352007-03-13 17:59:11 +0100258 /* We have no FPU yet */
259 _exception(SIGILL, regs, ILL_COPROC, regs->pc);
Haavard Skinnemoen5f97f7f2006-09-25 23:32:13 -0700260}
261
262
263void __init trap_init(void)
264{
265
266}