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Linux/arch/avr32/kernel/traps.c

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

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