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5f97f7f9 HS |
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 | */ | |
623b0355 HS |
8 | |
9 | #include <linux/bug.h> | |
5f97f7f9 | 10 | #include <linux/init.h> |
5f97f7f9 | 11 | #include <linux/kallsyms.h> |
623b0355 | 12 | #include <linux/module.h> |
5f97f7f9 | 13 | #include <linux/notifier.h> |
623b0355 HS |
14 | #include <linux/sched.h> |
15 | #include <linux/uaccess.h> | |
5f97f7f9 | 16 | |
5f97f7f9 | 17 | #include <asm/addrspace.h> |
5f97f7f9 | 18 | #include <asm/mmu_context.h> |
623b0355 HS |
19 | #include <asm/ocd.h> |
20 | #include <asm/sysreg.h> | |
21 | #include <asm/traps.h> | |
5f97f7f9 | 22 | |
5f97f7f9 HS |
23 | static DEFINE_SPINLOCK(die_lock); |
24 | ||
623b0355 | 25 | void NORET_TYPE die(const char *str, struct pt_regs *regs, long err) |
5f97f7f9 | 26 | { |
5f97f7f9 HS |
27 | static int die_counter; |
28 | ||
29 | console_verbose(); | |
30 | spin_lock_irq(&die_lock); | |
31 | bust_spinlocks(1); | |
32 | ||
623b0355 HS |
33 | printk(KERN_ALERT "Oops: %s, sig: %ld [#%d]\n" KERN_EMERG, |
34 | str, err, ++die_counter); | |
35 | #ifdef CONFIG_PREEMPT | |
36 | printk("PREEMPT "); | |
37 | #endif | |
38 | #ifdef CONFIG_FRAME_POINTER | |
39 | printk("FRAME_POINTER "); | |
40 | #endif | |
41 | if (current_cpu_data.features & AVR32_FEATURE_OCD) { | |
8dfe8f29 | 42 | unsigned long did = ocd_read(DID); |
623b0355 HS |
43 | printk("chip: 0x%03lx:0x%04lx rev %lu\n", |
44 | (did >> 1) & 0x7ff, | |
45 | (did >> 12) & 0x7fff, | |
46 | (did >> 28) & 0xf); | |
47 | } else { | |
48 | printk("cpu: arch %u r%u / core %u r%u\n", | |
49 | current_cpu_data.arch_type, | |
50 | current_cpu_data.arch_revision, | |
51 | current_cpu_data.cpu_type, | |
52 | current_cpu_data.cpu_revision); | |
5f97f7f9 HS |
53 | } |
54 | ||
623b0355 HS |
55 | print_modules(); |
56 | show_regs_log_lvl(regs, KERN_EMERG); | |
57 | show_stack_log_lvl(current, regs->sp, regs, KERN_EMERG); | |
5f97f7f9 | 58 | bust_spinlocks(0); |
bcdcd8e7 | 59 | add_taint(TAINT_DIE); |
5f97f7f9 | 60 | spin_unlock_irq(&die_lock); |
623b0355 HS |
61 | |
62 | if (in_interrupt()) | |
63 | panic("Fatal exception in interrupt"); | |
64 | ||
65 | if (panic_on_oops) | |
66 | panic("Fatal exception"); | |
67 | ||
68 | do_exit(err); | |
5f97f7f9 HS |
69 | } |
70 | ||
623b0355 HS |
71 | void _exception(long signr, struct pt_regs *regs, int code, |
72 | unsigned long addr) | |
5f97f7f9 | 73 | { |
623b0355 HS |
74 | siginfo_t info; |
75 | ||
5f97f7f9 | 76 | if (!user_mode(regs)) |
623b0355 HS |
77 | die("Unhandled exception in kernel mode", regs, signr); |
78 | ||
79 | memset(&info, 0, sizeof(info)); | |
80 | info.si_signo = signr; | |
81 | info.si_code = code; | |
82 | info.si_addr = (void __user *)addr; | |
83 | force_sig_info(signr, &info, current); | |
5f97f7f9 | 84 | |
5f97f7f9 | 85 | /* |
623b0355 HS |
86 | * Init gets no signals that it doesn't have a handler for. |
87 | * That's all very well, but if it has caused a synchronous | |
88 | * exception and we ignore the resulting signal, it will just | |
89 | * generate the same exception over and over again and we get | |
90 | * nowhere. Better to kill it and let the kernel panic. | |
5f97f7f9 | 91 | */ |
b460cbc5 | 92 | if (is_global_init(current)) { |
623b0355 HS |
93 | __sighandler_t handler; |
94 | ||
95 | spin_lock_irq(¤t->sighand->siglock); | |
96 | handler = current->sighand->action[signr-1].sa.sa_handler; | |
97 | spin_unlock_irq(¤t->sighand->siglock); | |
98 | if (handler == SIG_DFL) { | |
99 | /* init has generated a synchronous exception | |
100 | and it doesn't have a handler for the signal */ | |
101 | printk(KERN_CRIT "init has generated signal %ld " | |
102 | "but has no handler for it\n", signr); | |
103 | do_exit(signr); | |
104 | } | |
105 | } | |
106 | } | |
5f97f7f9 | 107 | |
623b0355 HS |
108 | asmlinkage void do_nmi(unsigned long ecr, struct pt_regs *regs) |
109 | { | |
110 | printk(KERN_ALERT "Got Non-Maskable Interrupt, dumping regs\n"); | |
111 | show_regs_log_lvl(regs, KERN_ALERT); | |
112 | show_stack_log_lvl(current, regs->sp, regs, KERN_ALERT); | |
5f97f7f9 HS |
113 | } |
114 | ||
115 | asmlinkage void do_critical_exception(unsigned long ecr, struct pt_regs *regs) | |
116 | { | |
623b0355 | 117 | die("Critical exception", regs, SIGKILL); |
5f97f7f9 HS |
118 | } |
119 | ||
120 | asmlinkage void do_address_exception(unsigned long ecr, struct pt_regs *regs) | |
121 | { | |
623b0355 | 122 | _exception(SIGBUS, regs, BUS_ADRALN, regs->pc); |
5f97f7f9 HS |
123 | } |
124 | ||
125 | /* This way of handling undefined instructions is stolen from ARM */ | |
126 | static LIST_HEAD(undef_hook); | |
e89b064a | 127 | static DEFINE_SPINLOCK(undef_lock); |
5f97f7f9 HS |
128 | |
129 | void register_undef_hook(struct undef_hook *hook) | |
130 | { | |
131 | spin_lock_irq(&undef_lock); | |
132 | list_add(&hook->node, &undef_hook); | |
133 | spin_unlock_irq(&undef_lock); | |
134 | } | |
135 | ||
136 | void unregister_undef_hook(struct undef_hook *hook) | |
137 | { | |
138 | spin_lock_irq(&undef_lock); | |
139 | list_del(&hook->node); | |
140 | spin_unlock_irq(&undef_lock); | |
141 | } | |
142 | ||
143 | static int do_cop_absent(u32 insn) | |
144 | { | |
145 | int cop_nr; | |
146 | u32 cpucr; | |
623b0355 HS |
147 | |
148 | if ((insn & 0xfdf00000) == 0xf1900000) | |
5f97f7f9 HS |
149 | /* LDC0 */ |
150 | cop_nr = 0; | |
151 | else | |
152 | cop_nr = (insn >> 13) & 0x7; | |
153 | ||
154 | /* Try enabling the coprocessor */ | |
155 | cpucr = sysreg_read(CPUCR); | |
156 | cpucr |= (1 << (24 + cop_nr)); | |
157 | sysreg_write(CPUCR, cpucr); | |
158 | ||
159 | cpucr = sysreg_read(CPUCR); | |
623b0355 HS |
160 | if (!(cpucr & (1 << (24 + cop_nr)))) |
161 | return -ENODEV; | |
5f97f7f9 HS |
162 | |
163 | return 0; | |
164 | } | |
165 | ||
623b0355 | 166 | int is_valid_bugaddr(unsigned long pc) |
5f97f7f9 | 167 | { |
623b0355 HS |
168 | unsigned short opcode; |
169 | ||
170 | if (pc < PAGE_OFFSET) | |
171 | return 0; | |
172 | if (probe_kernel_address((u16 *)pc, opcode)) | |
173 | return 0; | |
5f97f7f9 | 174 | |
623b0355 | 175 | return opcode == AVR32_BUG_OPCODE; |
5f97f7f9 | 176 | } |
5f97f7f9 HS |
177 | |
178 | asmlinkage void do_illegal_opcode(unsigned long ecr, struct pt_regs *regs) | |
179 | { | |
180 | u32 insn; | |
181 | struct undef_hook *hook; | |
5f97f7f9 | 182 | void __user *pc; |
623b0355 | 183 | long code; |
5f97f7f9 | 184 | |
623b0355 HS |
185 | if (!user_mode(regs) && (ecr == ECR_ILLEGAL_OPCODE)) { |
186 | enum bug_trap_type type; | |
187 | ||
608e2619 | 188 | type = report_bug(regs->pc, regs); |
623b0355 HS |
189 | switch (type) { |
190 | case BUG_TRAP_TYPE_NONE: | |
191 | break; | |
192 | case BUG_TRAP_TYPE_WARN: | |
193 | regs->pc += 2; | |
194 | return; | |
195 | case BUG_TRAP_TYPE_BUG: | |
196 | die("Kernel BUG", regs, SIGKILL); | |
197 | } | |
198 | } | |
5f97f7f9 HS |
199 | |
200 | local_irq_enable(); | |
201 | ||
623b0355 HS |
202 | if (user_mode(regs)) { |
203 | pc = (void __user *)instruction_pointer(regs); | |
204 | if (get_user(insn, (u32 __user *)pc)) | |
205 | goto invalid_area; | |
5f97f7f9 | 206 | |
623b0355 | 207 | if (ecr == ECR_COPROC_ABSENT && !do_cop_absent(insn)) |
5f97f7f9 | 208 | return; |
5f97f7f9 | 209 | |
623b0355 HS |
210 | spin_lock_irq(&undef_lock); |
211 | list_for_each_entry(hook, &undef_hook, node) { | |
212 | if ((insn & hook->insn_mask) == hook->insn_val) { | |
213 | if (hook->fn(regs, insn) == 0) { | |
214 | spin_unlock_irq(&undef_lock); | |
215 | return; | |
216 | } | |
5f97f7f9 HS |
217 | } |
218 | } | |
623b0355 | 219 | spin_unlock_irq(&undef_lock); |
5f97f7f9 | 220 | } |
5f97f7f9 | 221 | |
5f97f7f9 | 222 | switch (ecr) { |
5f97f7f9 | 223 | case ECR_PRIVILEGE_VIOLATION: |
623b0355 | 224 | code = ILL_PRVOPC; |
5f97f7f9 HS |
225 | break; |
226 | case ECR_COPROC_ABSENT: | |
623b0355 | 227 | code = ILL_COPROC; |
5f97f7f9 HS |
228 | break; |
229 | default: | |
623b0355 HS |
230 | code = ILL_ILLOPC; |
231 | break; | |
5f97f7f9 HS |
232 | } |
233 | ||
623b0355 | 234 | _exception(SIGILL, regs, code, regs->pc); |
5f97f7f9 HS |
235 | return; |
236 | ||
623b0355 HS |
237 | invalid_area: |
238 | _exception(SIGSEGV, regs, SEGV_MAPERR, regs->pc); | |
5f97f7f9 HS |
239 | } |
240 | ||
241 | asmlinkage void do_fpe(unsigned long ecr, struct pt_regs *regs) | |
242 | { | |
623b0355 HS |
243 | /* We have no FPU yet */ |
244 | _exception(SIGILL, regs, ILL_COPROC, regs->pc); | |
5f97f7f9 HS |
245 | } |
246 | ||
247 | ||
248 | void __init trap_init(void) | |
249 | { | |
250 | ||
251 | } |