Merge branch 'x86-cpu-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git...
[linux-2.6.git] / arch / m32r / kernel / traps.c
1 /*
2  *  linux/arch/m32r/kernel/traps.c
3  *
4  *  Copyright (C) 2001, 2002  Hirokazu Takata, Hiroyuki Kondo,
5  *                            Hitoshi Yamamoto
6  */
7
8 /*
9  * 'traps.c' handles hardware traps and faults after we have saved some
10  * state in 'entry.S'.
11  */
12 #include <linux/init.h>
13 #include <linux/kernel.h>
14 #include <linux/kallsyms.h>
15 #include <linux/stddef.h>
16 #include <linux/ptrace.h>
17 #include <linux/mm.h>
18 #include <asm/page.h>
19 #include <asm/processor.h>
20
21 #include <asm/system.h>
22 #include <asm/uaccess.h>
23 #include <asm/io.h>
24 #include <asm/atomic.h>
25
26 #include <asm/smp.h>
27
28 #include <linux/module.h>
29
30 asmlinkage void alignment_check(void);
31 asmlinkage void ei_handler(void);
32 asmlinkage void rie_handler(void);
33 asmlinkage void debug_trap(void);
34 asmlinkage void cache_flushing_handler(void);
35 asmlinkage void ill_trap(void);
36
37 #ifdef CONFIG_SMP
38 extern void smp_reschedule_interrupt(void);
39 extern void smp_invalidate_interrupt(void);
40 extern void smp_call_function_interrupt(void);
41 extern void smp_ipi_timer_interrupt(void);
42 extern void smp_flush_cache_all_interrupt(void);
43 extern void smp_call_function_single_interrupt(void);
44
45 /*
46  * for Boot AP function
47  */
48 asm (
49         "       .section .eit_vector4,\"ax\"    \n"
50         "       .global _AP_RE                  \n"
51         "       .global startup_AP              \n"
52         "_AP_RE:                                \n"
53         "       .fill 32, 4, 0                  \n"
54         "_AP_EI: bra    startup_AP              \n"
55         "       .previous                       \n"
56 );
57 #endif  /* CONFIG_SMP */
58
59 extern unsigned long    eit_vector[];
60 #define BRA_INSN(func, entry)   \
61         ((unsigned long)func - (unsigned long)eit_vector - entry*4)/4 \
62         + 0xff000000UL
63
64 static void set_eit_vector_entries(void)
65 {
66         extern void default_eit_handler(void);
67         extern void system_call(void);
68         extern void pie_handler(void);
69         extern void ace_handler(void);
70         extern void tme_handler(void);
71         extern void _flush_cache_copyback_all(void);
72
73         eit_vector[0] = 0xd0c00001; /* seth r0, 0x01 */
74         eit_vector[1] = BRA_INSN(default_eit_handler, 1);
75         eit_vector[4] = 0xd0c00010; /* seth r0, 0x10 */
76         eit_vector[5] = BRA_INSN(default_eit_handler, 5);
77         eit_vector[8] = BRA_INSN(rie_handler, 8);
78         eit_vector[12] = BRA_INSN(alignment_check, 12);
79         eit_vector[16] = BRA_INSN(ill_trap, 16);
80         eit_vector[17] = BRA_INSN(debug_trap, 17);
81         eit_vector[18] = BRA_INSN(system_call, 18);
82         eit_vector[19] = BRA_INSN(ill_trap, 19);
83         eit_vector[20] = BRA_INSN(ill_trap, 20);
84         eit_vector[21] = BRA_INSN(ill_trap, 21);
85         eit_vector[22] = BRA_INSN(ill_trap, 22);
86         eit_vector[23] = BRA_INSN(ill_trap, 23);
87         eit_vector[24] = BRA_INSN(ill_trap, 24);
88         eit_vector[25] = BRA_INSN(ill_trap, 25);
89         eit_vector[26] = BRA_INSN(ill_trap, 26);
90         eit_vector[27] = BRA_INSN(ill_trap, 27);
91         eit_vector[28] = BRA_INSN(cache_flushing_handler, 28);
92         eit_vector[29] = BRA_INSN(ill_trap, 29);
93         eit_vector[30] = BRA_INSN(ill_trap, 30);
94         eit_vector[31] = BRA_INSN(ill_trap, 31);
95         eit_vector[32] = BRA_INSN(ei_handler, 32);
96         eit_vector[64] = BRA_INSN(pie_handler, 64);
97 #ifdef CONFIG_MMU
98         eit_vector[68] = BRA_INSN(ace_handler, 68);
99         eit_vector[72] = BRA_INSN(tme_handler, 72);
100 #endif /* CONFIG_MMU */
101 #ifdef CONFIG_SMP
102         eit_vector[184] = (unsigned long)smp_reschedule_interrupt;
103         eit_vector[185] = (unsigned long)smp_invalidate_interrupt;
104         eit_vector[186] = (unsigned long)smp_call_function_interrupt;
105         eit_vector[187] = (unsigned long)smp_ipi_timer_interrupt;
106         eit_vector[188] = (unsigned long)smp_flush_cache_all_interrupt;
107         eit_vector[189] = 0;    /* CPU_BOOT_IPI */
108         eit_vector[190] = (unsigned long)smp_call_function_single_interrupt;
109         eit_vector[191] = 0;
110 #endif
111         _flush_cache_copyback_all();
112 }
113
114 void __init trap_init(void)
115 {
116         set_eit_vector_entries();
117
118         /*
119          * Should be a barrier for any external CPU state.
120          */
121         cpu_init();
122 }
123
124 static int kstack_depth_to_print = 24;
125
126 static void show_trace(struct task_struct *task, unsigned long *stack)
127 {
128         unsigned long addr;
129
130         if (!stack)
131                 stack = (unsigned long*)&stack;
132
133         printk("Call Trace: ");
134         while (!kstack_end(stack)) {
135                 addr = *stack++;
136                 if (__kernel_text_address(addr)) {
137                         printk("[<%08lx>] ", addr);
138                         print_symbol("%s\n", addr);
139                 }
140         }
141         printk("\n");
142 }
143
144 void show_stack(struct task_struct *task, unsigned long *sp)
145 {
146         unsigned long  *stack;
147         int  i;
148
149         /*
150          * debugging aid: "show_stack(NULL);" prints the
151          * back trace for this cpu.
152          */
153
154         if(sp==NULL) {
155                 if (task)
156                         sp = (unsigned long *)task->thread.sp;
157                 else
158                         sp=(unsigned long*)&sp;
159         }
160
161         stack = sp;
162         for(i=0; i < kstack_depth_to_print; i++) {
163                 if (kstack_end(stack))
164                         break;
165                 if (i && ((i % 4) == 0))
166                         printk("\n       ");
167                 printk("%08lx ", *stack++);
168         }
169         printk("\n");
170         show_trace(task, sp);
171 }
172
173 void dump_stack(void)
174 {
175         unsigned long stack;
176
177         show_trace(current, &stack);
178 }
179
180 EXPORT_SYMBOL(dump_stack);
181
182 static void show_registers(struct pt_regs *regs)
183 {
184         int i = 0;
185         int in_kernel = 1;
186         unsigned long sp;
187
188         printk("CPU:    %d\n", smp_processor_id());
189         show_regs(regs);
190
191         sp = (unsigned long) (1+regs);
192         if (user_mode(regs)) {
193                 in_kernel = 0;
194                 sp = regs->spu;
195                 printk("SPU: %08lx\n", sp);
196         } else {
197                 printk("SPI: %08lx\n", sp);
198         }
199         printk("Process %s (pid: %d, process nr: %d, stackpage=%08lx)",
200                 current->comm, task_pid_nr(current), 0xffff & i, 4096+(unsigned long)current);
201
202         /*
203          * When in-kernel, we also print out the stack and code at the
204          * time of the fault..
205          */
206         if (in_kernel) {
207                 printk("\nStack: ");
208                 show_stack(current, (unsigned long*) sp);
209
210                 printk("\nCode: ");
211                 if (regs->bpc < PAGE_OFFSET)
212                         goto bad;
213
214                 for(i=0;i<20;i++) {
215                         unsigned char c;
216                         if (__get_user(c, &((unsigned char*)regs->bpc)[i])) {
217 bad:
218                                 printk(" Bad PC value.");
219                                 break;
220                         }
221                         printk("%02x ", c);
222                 }
223         }
224         printk("\n");
225 }
226
227 static DEFINE_SPINLOCK(die_lock);
228
229 void die(const char * str, struct pt_regs * regs, long err)
230 {
231         console_verbose();
232         spin_lock_irq(&die_lock);
233         bust_spinlocks(1);
234         printk("%s: %04lx\n", str, err & 0xffff);
235         show_registers(regs);
236         bust_spinlocks(0);
237         spin_unlock_irq(&die_lock);
238         do_exit(SIGSEGV);
239 }
240
241 static __inline__ void die_if_kernel(const char * str,
242         struct pt_regs * regs, long err)
243 {
244         if (!user_mode(regs))
245                 die(str, regs, err);
246 }
247
248 static __inline__ void do_trap(int trapnr, int signr, const char * str,
249         struct pt_regs * regs, long error_code, siginfo_t *info)
250 {
251         if (user_mode(regs)) {
252                 /* trap_signal */
253                 struct task_struct *tsk = current;
254                 tsk->thread.error_code = error_code;
255                 tsk->thread.trap_no = trapnr;
256                 if (info)
257                         force_sig_info(signr, info, tsk);
258                 else
259                         force_sig(signr, tsk);
260                 return;
261         } else {
262                 /* kernel_trap */
263                 if (!fixup_exception(regs))
264                         die(str, regs, error_code);
265                 return;
266         }
267 }
268
269 #define DO_ERROR(trapnr, signr, str, name) \
270 asmlinkage void do_##name(struct pt_regs * regs, long error_code) \
271 { \
272         do_trap(trapnr, signr, NULL, regs, error_code, NULL); \
273 }
274
275 #define DO_ERROR_INFO(trapnr, signr, str, name, sicode, siaddr) \
276 asmlinkage void do_##name(struct pt_regs * regs, long error_code) \
277 { \
278         siginfo_t info; \
279         info.si_signo = signr; \
280         info.si_errno = 0; \
281         info.si_code = sicode; \
282         info.si_addr = (void __user *)siaddr; \
283         do_trap(trapnr, signr, str, regs, error_code, &info); \
284 }
285
286 DO_ERROR( 1, SIGTRAP, "debug trap", debug_trap)
287 DO_ERROR_INFO(0x20, SIGILL,  "reserved instruction ", rie_handler, ILL_ILLOPC, regs->bpc)
288 DO_ERROR_INFO(0x100, SIGILL,  "privileged instruction", pie_handler, ILL_PRVOPC, regs->bpc)
289 DO_ERROR_INFO(-1, SIGILL,  "illegal trap", ill_trap, ILL_ILLTRP, regs->bpc)
290
291 extern int handle_unaligned_access(unsigned long, struct pt_regs *);
292
293 /* This code taken from arch/sh/kernel/traps.c */
294 asmlinkage void do_alignment_check(struct pt_regs *regs, long error_code)
295 {
296         mm_segment_t oldfs;
297         unsigned long insn;
298         int tmp;
299
300         oldfs = get_fs();
301
302         if (user_mode(regs)) {
303                 local_irq_enable();
304                 current->thread.error_code = error_code;
305                 current->thread.trap_no = 0x17;
306
307                 set_fs(USER_DS);
308                 if (copy_from_user(&insn, (void *)regs->bpc, 4)) {
309                         set_fs(oldfs);
310                         goto uspace_segv;
311                 }
312                 tmp = handle_unaligned_access(insn, regs);
313                 set_fs(oldfs);
314
315                 if (!tmp)
316                         return;
317
318         uspace_segv:
319                 printk(KERN_NOTICE "Killing process \"%s\" due to unaligned "
320                         "access\n", current->comm);
321                 force_sig(SIGSEGV, current);
322         } else {
323                 set_fs(KERNEL_DS);
324                 if (copy_from_user(&insn, (void *)regs->bpc, 4)) {
325                         set_fs(oldfs);
326                         die("insn faulting in do_address_error", regs, 0);
327                 }
328                 handle_unaligned_access(insn, regs);
329                 set_fs(oldfs);
330         }
331 }