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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> | |
ba84be23 | 10 | #include <linux/hardirq.h> |
5f97f7f9 | 11 | #include <linux/init.h> |
5f97f7f9 | 12 | #include <linux/kallsyms.h> |
e7ba176b | 13 | #include <linux/kdebug.h> |
9a2950fe PG |
14 | #include <linux/extable.h> |
15 | #include <linux/module.h> /* print_modules */ | |
5f97f7f9 | 16 | #include <linux/notifier.h> |
3f07c014 | 17 | #include <linux/sched/signal.h> |
623b0355 | 18 | #include <linux/uaccess.h> |
5f97f7f9 | 19 | |
5f97f7f9 | 20 | #include <asm/addrspace.h> |
5f97f7f9 | 21 | #include <asm/mmu_context.h> |
623b0355 HS |
22 | #include <asm/ocd.h> |
23 | #include <asm/sysreg.h> | |
24 | #include <asm/traps.h> | |
5f97f7f9 | 25 | |
5f97f7f9 HS |
26 | static DEFINE_SPINLOCK(die_lock); |
27 | ||
9402c95f | 28 | void die(const char *str, struct pt_regs *regs, long err) |
5f97f7f9 | 29 | { |
5f97f7f9 HS |
30 | static int die_counter; |
31 | ||
32 | console_verbose(); | |
33 | spin_lock_irq(&die_lock); | |
34 | bust_spinlocks(1); | |
35 | ||
ad361c98 | 36 | printk(KERN_ALERT "Oops: %s, sig: %ld [#%d]\n", |
623b0355 | 37 | str, err, ++die_counter); |
ad361c98 JP |
38 | |
39 | printk(KERN_EMERG); | |
40 | ||
623b0355 | 41 | #ifdef CONFIG_PREEMPT |
ad361c98 | 42 | printk(KERN_CONT "PREEMPT "); |
623b0355 HS |
43 | #endif |
44 | #ifdef CONFIG_FRAME_POINTER | |
ad361c98 | 45 | printk(KERN_CONT "FRAME_POINTER "); |
623b0355 HS |
46 | #endif |
47 | if (current_cpu_data.features & AVR32_FEATURE_OCD) { | |
8dfe8f29 | 48 | unsigned long did = ocd_read(DID); |
ad361c98 | 49 | printk(KERN_CONT "chip: 0x%03lx:0x%04lx rev %lu\n", |
623b0355 HS |
50 | (did >> 1) & 0x7ff, |
51 | (did >> 12) & 0x7fff, | |
52 | (did >> 28) & 0xf); | |
53 | } else { | |
ad361c98 | 54 | printk(KERN_CONT "cpu: arch %u r%u / core %u r%u\n", |
623b0355 HS |
55 | current_cpu_data.arch_type, |
56 | current_cpu_data.arch_revision, | |
57 | current_cpu_data.cpu_type, | |
58 | current_cpu_data.cpu_revision); | |
5f97f7f9 HS |
59 | } |
60 | ||
623b0355 HS |
61 | print_modules(); |
62 | show_regs_log_lvl(regs, KERN_EMERG); | |
63 | show_stack_log_lvl(current, regs->sp, regs, KERN_EMERG); | |
5f97f7f9 | 64 | bust_spinlocks(0); |
373d4d09 | 65 | add_taint(TAINT_DIE, LOCKDEP_NOW_UNRELIABLE); |
5f97f7f9 | 66 | spin_unlock_irq(&die_lock); |
623b0355 HS |
67 | |
68 | if (in_interrupt()) | |
69 | panic("Fatal exception in interrupt"); | |
70 | ||
71 | if (panic_on_oops) | |
72 | panic("Fatal exception"); | |
73 | ||
74 | do_exit(err); | |
5f97f7f9 HS |
75 | } |
76 | ||
623b0355 HS |
77 | void _exception(long signr, struct pt_regs *regs, int code, |
78 | unsigned long addr) | |
5f97f7f9 | 79 | { |
623b0355 HS |
80 | siginfo_t info; |
81 | ||
bb6e6470 HS |
82 | if (!user_mode(regs)) { |
83 | const struct exception_table_entry *fixup; | |
84 | ||
85 | /* Are we prepared to handle this kernel fault? */ | |
86 | fixup = search_exception_tables(regs->pc); | |
87 | if (fixup) { | |
88 | regs->pc = fixup->fixup; | |
89 | return; | |
90 | } | |
623b0355 | 91 | die("Unhandled exception in kernel mode", regs, signr); |
bb6e6470 | 92 | } |
623b0355 HS |
93 | |
94 | memset(&info, 0, sizeof(info)); | |
95 | info.si_signo = signr; | |
96 | info.si_code = code; | |
97 | info.si_addr = (void __user *)addr; | |
98 | force_sig_info(signr, &info, current); | |
623b0355 | 99 | } |
5f97f7f9 | 100 | |
623b0355 HS |
101 | asmlinkage void do_nmi(unsigned long ecr, struct pt_regs *regs) |
102 | { | |
e7ba176b HS |
103 | int ret; |
104 | ||
105 | nmi_enter(); | |
106 | ||
107 | ret = notify_die(DIE_NMI, "NMI", regs, 0, ecr, SIGINT); | |
108 | switch (ret) { | |
109 | case NOTIFY_OK: | |
110 | case NOTIFY_STOP: | |
3d431a74 | 111 | break; |
e7ba176b HS |
112 | case NOTIFY_BAD: |
113 | die("Fatal Non-Maskable Interrupt", regs, SIGINT); | |
114 | default: | |
3d431a74 MS |
115 | printk(KERN_ALERT "Got NMI, but nobody cared. Disabling...\n"); |
116 | nmi_disable(); | |
e7ba176b HS |
117 | break; |
118 | } | |
3d431a74 | 119 | nmi_exit(); |
5f97f7f9 HS |
120 | } |
121 | ||
122 | asmlinkage void do_critical_exception(unsigned long ecr, struct pt_regs *regs) | |
123 | { | |
623b0355 | 124 | die("Critical exception", regs, SIGKILL); |
5f97f7f9 HS |
125 | } |
126 | ||
127 | asmlinkage void do_address_exception(unsigned long ecr, struct pt_regs *regs) | |
128 | { | |
623b0355 | 129 | _exception(SIGBUS, regs, BUS_ADRALN, regs->pc); |
5f97f7f9 HS |
130 | } |
131 | ||
132 | /* This way of handling undefined instructions is stolen from ARM */ | |
133 | static LIST_HEAD(undef_hook); | |
e89b064a | 134 | static DEFINE_SPINLOCK(undef_lock); |
5f97f7f9 HS |
135 | |
136 | void register_undef_hook(struct undef_hook *hook) | |
137 | { | |
138 | spin_lock_irq(&undef_lock); | |
139 | list_add(&hook->node, &undef_hook); | |
140 | spin_unlock_irq(&undef_lock); | |
141 | } | |
142 | ||
143 | void unregister_undef_hook(struct undef_hook *hook) | |
144 | { | |
145 | spin_lock_irq(&undef_lock); | |
146 | list_del(&hook->node); | |
147 | spin_unlock_irq(&undef_lock); | |
148 | } | |
149 | ||
150 | static int do_cop_absent(u32 insn) | |
151 | { | |
152 | int cop_nr; | |
153 | u32 cpucr; | |
623b0355 HS |
154 | |
155 | if ((insn & 0xfdf00000) == 0xf1900000) | |
5f97f7f9 HS |
156 | /* LDC0 */ |
157 | cop_nr = 0; | |
158 | else | |
159 | cop_nr = (insn >> 13) & 0x7; | |
160 | ||
161 | /* Try enabling the coprocessor */ | |
162 | cpucr = sysreg_read(CPUCR); | |
163 | cpucr |= (1 << (24 + cop_nr)); | |
164 | sysreg_write(CPUCR, cpucr); | |
165 | ||
166 | cpucr = sysreg_read(CPUCR); | |
623b0355 HS |
167 | if (!(cpucr & (1 << (24 + cop_nr)))) |
168 | return -ENODEV; | |
5f97f7f9 HS |
169 | |
170 | return 0; | |
171 | } | |
172 | ||
957ecd7d | 173 | #ifdef CONFIG_BUG |
623b0355 | 174 | int is_valid_bugaddr(unsigned long pc) |
5f97f7f9 | 175 | { |
623b0355 HS |
176 | unsigned short opcode; |
177 | ||
178 | if (pc < PAGE_OFFSET) | |
179 | return 0; | |
180 | if (probe_kernel_address((u16 *)pc, opcode)) | |
181 | return 0; | |
5f97f7f9 | 182 | |
623b0355 | 183 | return opcode == AVR32_BUG_OPCODE; |
5f97f7f9 | 184 | } |
957ecd7d | 185 | #endif |
5f97f7f9 HS |
186 | |
187 | asmlinkage void do_illegal_opcode(unsigned long ecr, struct pt_regs *regs) | |
188 | { | |
189 | u32 insn; | |
190 | struct undef_hook *hook; | |
5f97f7f9 | 191 | void __user *pc; |
623b0355 | 192 | long code; |
5f97f7f9 | 193 | |
957ecd7d | 194 | #ifdef CONFIG_BUG |
623b0355 HS |
195 | if (!user_mode(regs) && (ecr == ECR_ILLEGAL_OPCODE)) { |
196 | enum bug_trap_type type; | |
197 | ||
608e2619 | 198 | type = report_bug(regs->pc, regs); |
623b0355 HS |
199 | switch (type) { |
200 | case BUG_TRAP_TYPE_NONE: | |
201 | break; | |
202 | case BUG_TRAP_TYPE_WARN: | |
203 | regs->pc += 2; | |
204 | return; | |
205 | case BUG_TRAP_TYPE_BUG: | |
206 | die("Kernel BUG", regs, SIGKILL); | |
207 | } | |
208 | } | |
957ecd7d | 209 | #endif |
5f97f7f9 HS |
210 | |
211 | local_irq_enable(); | |
212 | ||
623b0355 HS |
213 | if (user_mode(regs)) { |
214 | pc = (void __user *)instruction_pointer(regs); | |
215 | if (get_user(insn, (u32 __user *)pc)) | |
216 | goto invalid_area; | |
5f97f7f9 | 217 | |
623b0355 | 218 | if (ecr == ECR_COPROC_ABSENT && !do_cop_absent(insn)) |
5f97f7f9 | 219 | return; |
5f97f7f9 | 220 | |
623b0355 HS |
221 | spin_lock_irq(&undef_lock); |
222 | list_for_each_entry(hook, &undef_hook, node) { | |
223 | if ((insn & hook->insn_mask) == hook->insn_val) { | |
224 | if (hook->fn(regs, insn) == 0) { | |
225 | spin_unlock_irq(&undef_lock); | |
226 | return; | |
227 | } | |
5f97f7f9 HS |
228 | } |
229 | } | |
623b0355 | 230 | spin_unlock_irq(&undef_lock); |
5f97f7f9 | 231 | } |
5f97f7f9 | 232 | |
5f97f7f9 | 233 | switch (ecr) { |
5f97f7f9 | 234 | case ECR_PRIVILEGE_VIOLATION: |
623b0355 | 235 | code = ILL_PRVOPC; |
5f97f7f9 HS |
236 | break; |
237 | case ECR_COPROC_ABSENT: | |
623b0355 | 238 | code = ILL_COPROC; |
5f97f7f9 HS |
239 | break; |
240 | default: | |
623b0355 HS |
241 | code = ILL_ILLOPC; |
242 | break; | |
5f97f7f9 HS |
243 | } |
244 | ||
623b0355 | 245 | _exception(SIGILL, regs, code, regs->pc); |
5f97f7f9 HS |
246 | return; |
247 | ||
623b0355 HS |
248 | invalid_area: |
249 | _exception(SIGSEGV, regs, SEGV_MAPERR, regs->pc); | |
5f97f7f9 HS |
250 | } |
251 | ||
252 | asmlinkage void do_fpe(unsigned long ecr, struct pt_regs *regs) | |
253 | { | |
623b0355 HS |
254 | /* We have no FPU yet */ |
255 | _exception(SIGILL, regs, ILL_COPROC, regs->pc); | |
5f97f7f9 HS |
256 | } |
257 | ||
258 | ||
259 | void __init trap_init(void) | |
260 | { | |
261 | ||
262 | } |