Merge /pub/scm/linux/kernel/git/torvalds/linux-2.6
[linux-2.6] / arch / s390 / kernel / traps.c
1 /*
2  *  arch/s390/kernel/traps.c
3  *
4  *  S390 version
5  *    Copyright (C) 1999,2000 IBM Deutschland Entwicklung GmbH, IBM Corporation
6  *    Author(s): Martin Schwidefsky (schwidefsky@de.ibm.com),
7  *               Denis Joseph Barrow (djbarrow@de.ibm.com,barrow_dj@yahoo.com),
8  *
9  *  Derived from "arch/i386/kernel/traps.c"
10  *    Copyright (C) 1991, 1992 Linus Torvalds
11  */
12
13 /*
14  * 'Traps.c' handles hardware traps and faults after we have saved some
15  * state in 'asm.s'.
16  */
17 #include <linux/sched.h>
18 #include <linux/kernel.h>
19 #include <linux/string.h>
20 #include <linux/errno.h>
21 #include <linux/ptrace.h>
22 #include <linux/timer.h>
23 #include <linux/mm.h>
24 #include <linux/smp.h>
25 #include <linux/smp_lock.h>
26 #include <linux/init.h>
27 #include <linux/interrupt.h>
28 #include <linux/delay.h>
29 #include <linux/module.h>
30 #include <linux/kallsyms.h>
31 #include <linux/reboot.h>
32 #include <linux/kprobes.h>
33 #include <linux/bug.h>
34 #include <asm/system.h>
35 #include <asm/uaccess.h>
36 #include <asm/io.h>
37 #include <asm/atomic.h>
38 #include <asm/mathemu.h>
39 #include <asm/cpcmd.h>
40 #include <asm/s390_ext.h>
41 #include <asm/lowcore.h>
42 #include <asm/debug.h>
43 #include <asm/kdebug.h>
44
45 /* Called from entry.S only */
46 extern void handle_per_exception(struct pt_regs *regs);
47
48 typedef void pgm_check_handler_t(struct pt_regs *, long);
49 pgm_check_handler_t *pgm_check_table[128];
50
51 #ifdef CONFIG_SYSCTL
52 #ifdef CONFIG_PROCESS_DEBUG
53 int sysctl_userprocess_debug = 1;
54 #else
55 int sysctl_userprocess_debug = 0;
56 #endif
57 #endif
58
59 extern pgm_check_handler_t do_protection_exception;
60 extern pgm_check_handler_t do_dat_exception;
61 extern pgm_check_handler_t do_monitor_call;
62
63 #define stack_pointer ({ void **sp; asm("la %0,0(15)" : "=&d" (sp)); sp; })
64
65 #ifndef CONFIG_64BIT
66 #define FOURLONG "%08lx %08lx %08lx %08lx\n"
67 static int kstack_depth_to_print = 12;
68 #else /* CONFIG_64BIT */
69 #define FOURLONG "%016lx %016lx %016lx %016lx\n"
70 static int kstack_depth_to_print = 20;
71 #endif /* CONFIG_64BIT */
72
73 ATOMIC_NOTIFIER_HEAD(s390die_chain);
74
75 int register_die_notifier(struct notifier_block *nb)
76 {
77         return atomic_notifier_chain_register(&s390die_chain, nb);
78 }
79 EXPORT_SYMBOL(register_die_notifier);
80
81 int unregister_die_notifier(struct notifier_block *nb)
82 {
83         return atomic_notifier_chain_unregister(&s390die_chain, nb);
84 }
85 EXPORT_SYMBOL(unregister_die_notifier);
86
87 /*
88  * For show_trace we have tree different stack to consider:
89  *   - the panic stack which is used if the kernel stack has overflown
90  *   - the asynchronous interrupt stack (cpu related)
91  *   - the synchronous kernel stack (process related)
92  * The stack trace can start at any of the three stack and can potentially
93  * touch all of them. The order is: panic stack, async stack, sync stack.
94  */
95 static unsigned long
96 __show_trace(unsigned long sp, unsigned long low, unsigned long high)
97 {
98         struct stack_frame *sf;
99         struct pt_regs *regs;
100
101         while (1) {
102                 sp = sp & PSW_ADDR_INSN;
103                 if (sp < low || sp > high - sizeof(*sf))
104                         return sp;
105                 sf = (struct stack_frame *) sp;
106                 printk("([<%016lx>] ", sf->gprs[8] & PSW_ADDR_INSN);
107                 print_symbol("%s)\n", sf->gprs[8] & PSW_ADDR_INSN);
108                 /* Follow the backchain. */
109                 while (1) {
110                         low = sp;
111                         sp = sf->back_chain & PSW_ADDR_INSN;
112                         if (!sp)
113                                 break;
114                         if (sp <= low || sp > high - sizeof(*sf))
115                                 return sp;
116                         sf = (struct stack_frame *) sp;
117                         printk(" [<%016lx>] ", sf->gprs[8] & PSW_ADDR_INSN);
118                         print_symbol("%s\n", sf->gprs[8] & PSW_ADDR_INSN);
119                 }
120                 /* Zero backchain detected, check for interrupt frame. */
121                 sp = (unsigned long) (sf + 1);
122                 if (sp <= low || sp > high - sizeof(*regs))
123                         return sp;
124                 regs = (struct pt_regs *) sp;
125                 printk(" [<%016lx>] ", regs->psw.addr & PSW_ADDR_INSN);
126                 print_symbol("%s\n", regs->psw.addr & PSW_ADDR_INSN);
127                 low = sp;
128                 sp = regs->gprs[15];
129         }
130 }
131
132 void show_trace(struct task_struct *task, unsigned long *stack)
133 {
134         register unsigned long __r15 asm ("15");
135         unsigned long sp;
136
137         sp = (unsigned long) stack;
138         if (!sp)
139                 sp = task ? task->thread.ksp : __r15;
140         printk("Call Trace:\n");
141 #ifdef CONFIG_CHECK_STACK
142         sp = __show_trace(sp, S390_lowcore.panic_stack - 4096,
143                           S390_lowcore.panic_stack);
144 #endif
145         sp = __show_trace(sp, S390_lowcore.async_stack - ASYNC_SIZE,
146                           S390_lowcore.async_stack);
147         if (task)
148                 __show_trace(sp, (unsigned long) task_stack_page(task),
149                              (unsigned long) task_stack_page(task) + THREAD_SIZE);
150         else
151                 __show_trace(sp, S390_lowcore.thread_info,
152                              S390_lowcore.thread_info + THREAD_SIZE);
153         printk("\n");
154         if (!task)
155                 task = current;
156         debug_show_held_locks(task);
157 }
158
159 void show_stack(struct task_struct *task, unsigned long *sp)
160 {
161         register unsigned long * __r15 asm ("15");
162         unsigned long *stack;
163         int i;
164
165         if (!sp)
166                 stack = task ? (unsigned long *) task->thread.ksp : __r15;
167         else
168                 stack = sp;
169
170         for (i = 0; i < kstack_depth_to_print; i++) {
171                 if (((addr_t) stack & (THREAD_SIZE-1)) == 0)
172                         break;
173                 if (i && ((i * sizeof (long) % 32) == 0))
174                         printk("\n       ");
175                 printk("%p ", (void *)*stack++);
176         }
177         printk("\n");
178         show_trace(task, sp);
179 }
180
181 /*
182  * The architecture-independent dump_stack generator
183  */
184 void dump_stack(void)
185 {
186         show_stack(NULL, NULL);
187 }
188
189 EXPORT_SYMBOL(dump_stack);
190
191 static inline int mask_bits(struct pt_regs *regs, unsigned long bits)
192 {
193         return (regs->psw.mask & bits) / ((~bits + 1) & bits);
194 }
195
196 void show_registers(struct pt_regs *regs)
197 {
198         char *mode;
199
200         mode = (regs->psw.mask & PSW_MASK_PSTATE) ? "User" : "Krnl";
201         printk("%s PSW : %p %p",
202                mode, (void *) regs->psw.mask,
203                (void *) regs->psw.addr);
204         print_symbol(" (%s)\n", regs->psw.addr & PSW_ADDR_INSN);
205         printk("           R:%x T:%x IO:%x EX:%x Key:%x M:%x W:%x "
206                "P:%x AS:%x CC:%x PM:%x", mask_bits(regs, PSW_MASK_PER),
207                mask_bits(regs, PSW_MASK_DAT), mask_bits(regs, PSW_MASK_IO),
208                mask_bits(regs, PSW_MASK_EXT), mask_bits(regs, PSW_MASK_KEY),
209                mask_bits(regs, PSW_MASK_MCHECK), mask_bits(regs, PSW_MASK_WAIT),
210                mask_bits(regs, PSW_MASK_PSTATE), mask_bits(regs, PSW_MASK_ASC),
211                mask_bits(regs, PSW_MASK_CC), mask_bits(regs, PSW_MASK_PM));
212 #ifdef CONFIG_64BIT
213         printk(" EA:%x", mask_bits(regs, PSW_BASE_BITS));
214 #endif
215         printk("\n%s GPRS: " FOURLONG, mode,
216                regs->gprs[0], regs->gprs[1], regs->gprs[2], regs->gprs[3]);
217         printk("           " FOURLONG,
218                regs->gprs[4], regs->gprs[5], regs->gprs[6], regs->gprs[7]);
219         printk("           " FOURLONG,
220                regs->gprs[8], regs->gprs[9], regs->gprs[10], regs->gprs[11]);
221         printk("           " FOURLONG,
222                regs->gprs[12], regs->gprs[13], regs->gprs[14], regs->gprs[15]);
223
224         show_code(regs);
225 }       
226
227 /* This is called from fs/proc/array.c */
228 char *task_show_regs(struct task_struct *task, char *buffer)
229 {
230         struct pt_regs *regs;
231
232         regs = task_pt_regs(task);
233         buffer += sprintf(buffer, "task: %p, ksp: %p\n",
234                        task, (void *)task->thread.ksp);
235         buffer += sprintf(buffer, "User PSW : %p %p\n",
236                        (void *) regs->psw.mask, (void *)regs->psw.addr);
237
238         buffer += sprintf(buffer, "User GPRS: " FOURLONG,
239                           regs->gprs[0], regs->gprs[1],
240                           regs->gprs[2], regs->gprs[3]);
241         buffer += sprintf(buffer, "           " FOURLONG,
242                           regs->gprs[4], regs->gprs[5],
243                           regs->gprs[6], regs->gprs[7]);
244         buffer += sprintf(buffer, "           " FOURLONG,
245                           regs->gprs[8], regs->gprs[9],
246                           regs->gprs[10], regs->gprs[11]);
247         buffer += sprintf(buffer, "           " FOURLONG,
248                           regs->gprs[12], regs->gprs[13],
249                           regs->gprs[14], regs->gprs[15]);
250         buffer += sprintf(buffer, "User ACRS: %08x %08x %08x %08x\n",
251                           task->thread.acrs[0], task->thread.acrs[1],
252                           task->thread.acrs[2], task->thread.acrs[3]);
253         buffer += sprintf(buffer, "           %08x %08x %08x %08x\n",
254                           task->thread.acrs[4], task->thread.acrs[5],
255                           task->thread.acrs[6], task->thread.acrs[7]);
256         buffer += sprintf(buffer, "           %08x %08x %08x %08x\n",
257                           task->thread.acrs[8], task->thread.acrs[9],
258                           task->thread.acrs[10], task->thread.acrs[11]);
259         buffer += sprintf(buffer, "           %08x %08x %08x %08x\n",
260                           task->thread.acrs[12], task->thread.acrs[13],
261                           task->thread.acrs[14], task->thread.acrs[15]);
262         return buffer;
263 }
264
265 static DEFINE_SPINLOCK(die_lock);
266
267 void die(const char * str, struct pt_regs * regs, long err)
268 {
269         static int die_counter;
270
271         debug_stop_all();
272         console_verbose();
273         spin_lock_irq(&die_lock);
274         bust_spinlocks(1);
275         printk("%s: %04lx [#%d]\n", str, err & 0xffff, ++die_counter);
276         show_regs(regs);
277         bust_spinlocks(0);
278         spin_unlock_irq(&die_lock);
279         if (in_interrupt())
280                 panic("Fatal exception in interrupt");
281         if (panic_on_oops)
282                 panic("Fatal exception: panic_on_oops");
283         do_exit(SIGSEGV);
284 }
285
286 static void inline
287 report_user_fault(long interruption_code, struct pt_regs *regs)
288 {
289 #if defined(CONFIG_SYSCTL)
290         if (!sysctl_userprocess_debug)
291                 return;
292 #endif
293 #if defined(CONFIG_SYSCTL) || defined(CONFIG_PROCESS_DEBUG)
294         printk("User process fault: interruption code 0x%lX\n",
295                interruption_code);
296         show_regs(regs);
297 #endif
298 }
299
300 int is_valid_bugaddr(unsigned long addr)
301 {
302         return 1;
303 }
304
305 static void __kprobes inline do_trap(long interruption_code, int signr,
306                                         char *str, struct pt_regs *regs,
307                                         siginfo_t *info)
308 {
309         /*
310          * We got all needed information from the lowcore and can
311          * now safely switch on interrupts.
312          */
313         if (regs->psw.mask & PSW_MASK_PSTATE)
314                 local_irq_enable();
315
316         if (notify_die(DIE_TRAP, str, regs, interruption_code,
317                                 interruption_code, signr) == NOTIFY_STOP)
318                 return;
319
320         if (regs->psw.mask & PSW_MASK_PSTATE) {
321                 struct task_struct *tsk = current;
322
323                 tsk->thread.trap_no = interruption_code & 0xffff;
324                 force_sig_info(signr, info, tsk);
325                 report_user_fault(interruption_code, regs);
326         } else {
327                 const struct exception_table_entry *fixup;
328                 fixup = search_exception_tables(regs->psw.addr & PSW_ADDR_INSN);
329                 if (fixup)
330                         regs->psw.addr = fixup->fixup | PSW_ADDR_AMODE;
331                 else {
332                         enum bug_trap_type btt;
333
334                         btt = report_bug(regs->psw.addr & PSW_ADDR_INSN);
335                         if (btt == BUG_TRAP_TYPE_WARN)
336                                 return;
337                         die(str, regs, interruption_code);
338                 }
339         }
340 }
341
342 static inline void __user *get_check_address(struct pt_regs *regs)
343 {
344         return (void __user *)((regs->psw.addr-S390_lowcore.pgm_ilc) & PSW_ADDR_INSN);
345 }
346
347 void __kprobes do_single_step(struct pt_regs *regs)
348 {
349         if (notify_die(DIE_SSTEP, "sstep", regs, 0, 0,
350                                         SIGTRAP) == NOTIFY_STOP){
351                 return;
352         }
353         if ((current->ptrace & PT_PTRACED) != 0)
354                 force_sig(SIGTRAP, current);
355 }
356
357 static void default_trap_handler(struct pt_regs * regs, long interruption_code)
358 {
359         if (regs->psw.mask & PSW_MASK_PSTATE) {
360                 local_irq_enable();
361                 do_exit(SIGSEGV);
362                 report_user_fault(interruption_code, regs);
363         } else
364                 die("Unknown program exception", regs, interruption_code);
365 }
366
367 #define DO_ERROR_INFO(signr, str, name, sicode, siaddr) \
368 static void name(struct pt_regs * regs, long interruption_code) \
369 { \
370         siginfo_t info; \
371         info.si_signo = signr; \
372         info.si_errno = 0; \
373         info.si_code = sicode; \
374         info.si_addr = siaddr; \
375         do_trap(interruption_code, signr, str, regs, &info); \
376 }
377
378 DO_ERROR_INFO(SIGILL, "addressing exception", addressing_exception,
379               ILL_ILLADR, get_check_address(regs))
380 DO_ERROR_INFO(SIGILL,  "execute exception", execute_exception,
381               ILL_ILLOPN, get_check_address(regs))
382 DO_ERROR_INFO(SIGFPE,  "fixpoint divide exception", divide_exception,
383               FPE_INTDIV, get_check_address(regs))
384 DO_ERROR_INFO(SIGFPE,  "fixpoint overflow exception", overflow_exception,
385               FPE_INTOVF, get_check_address(regs))
386 DO_ERROR_INFO(SIGFPE,  "HFP overflow exception", hfp_overflow_exception,
387               FPE_FLTOVF, get_check_address(regs))
388 DO_ERROR_INFO(SIGFPE,  "HFP underflow exception", hfp_underflow_exception,
389               FPE_FLTUND, get_check_address(regs))
390 DO_ERROR_INFO(SIGFPE,  "HFP significance exception", hfp_significance_exception,
391               FPE_FLTRES, get_check_address(regs))
392 DO_ERROR_INFO(SIGFPE,  "HFP divide exception", hfp_divide_exception,
393               FPE_FLTDIV, get_check_address(regs))
394 DO_ERROR_INFO(SIGFPE,  "HFP square root exception", hfp_sqrt_exception,
395               FPE_FLTINV, get_check_address(regs))
396 DO_ERROR_INFO(SIGILL,  "operand exception", operand_exception,
397               ILL_ILLOPN, get_check_address(regs))
398 DO_ERROR_INFO(SIGILL,  "privileged operation", privileged_op,
399               ILL_PRVOPC, get_check_address(regs))
400 DO_ERROR_INFO(SIGILL,  "special operation exception", special_op_exception,
401               ILL_ILLOPN, get_check_address(regs))
402 DO_ERROR_INFO(SIGILL,  "translation exception", translation_exception,
403               ILL_ILLOPN, get_check_address(regs))
404
405 static inline void
406 do_fp_trap(struct pt_regs *regs, void __user *location,
407            int fpc, long interruption_code)
408 {
409         siginfo_t si;
410
411         si.si_signo = SIGFPE;
412         si.si_errno = 0;
413         si.si_addr = location;
414         si.si_code = 0;
415         /* FPC[2] is Data Exception Code */
416         if ((fpc & 0x00000300) == 0) {
417                 /* bits 6 and 7 of DXC are 0 iff IEEE exception */
418                 if (fpc & 0x8000) /* invalid fp operation */
419                         si.si_code = FPE_FLTINV;
420                 else if (fpc & 0x4000) /* div by 0 */
421                         si.si_code = FPE_FLTDIV;
422                 else if (fpc & 0x2000) /* overflow */
423                         si.si_code = FPE_FLTOVF;
424                 else if (fpc & 0x1000) /* underflow */
425                         si.si_code = FPE_FLTUND;
426                 else if (fpc & 0x0800) /* inexact */
427                         si.si_code = FPE_FLTRES;
428         }
429         current->thread.ieee_instruction_pointer = (addr_t) location;
430         do_trap(interruption_code, SIGFPE,
431                 "floating point exception", regs, &si);
432 }
433
434 static void illegal_op(struct pt_regs * regs, long interruption_code)
435 {
436         siginfo_t info;
437         __u8 opcode[6];
438         __u16 __user *location;
439         int signal = 0;
440
441         location = get_check_address(regs);
442
443         /*
444          * We got all needed information from the lowcore and can
445          * now safely switch on interrupts.
446          */
447         if (regs->psw.mask & PSW_MASK_PSTATE)
448                 local_irq_enable();
449
450         if (regs->psw.mask & PSW_MASK_PSTATE) {
451                 if (get_user(*((__u16 *) opcode), (__u16 __user *) location))
452                         return;
453                 if (*((__u16 *) opcode) == S390_BREAKPOINT_U16) {
454                         if (current->ptrace & PT_PTRACED)
455                                 force_sig(SIGTRAP, current);
456                         else
457                                 signal = SIGILL;
458 #ifdef CONFIG_MATHEMU
459                 } else if (opcode[0] == 0xb3) {
460                         if (get_user(*((__u16 *) (opcode+2)), location+1))
461                                 return;
462                         signal = math_emu_b3(opcode, regs);
463                 } else if (opcode[0] == 0xed) {
464                         if (get_user(*((__u32 *) (opcode+2)),
465                                      (__u32 __user *)(location+1)))
466                                 return;
467                         signal = math_emu_ed(opcode, regs);
468                 } else if (*((__u16 *) opcode) == 0xb299) {
469                         if (get_user(*((__u16 *) (opcode+2)), location+1))
470                                 return;
471                         signal = math_emu_srnm(opcode, regs);
472                 } else if (*((__u16 *) opcode) == 0xb29c) {
473                         if (get_user(*((__u16 *) (opcode+2)), location+1))
474                                 return;
475                         signal = math_emu_stfpc(opcode, regs);
476                 } else if (*((__u16 *) opcode) == 0xb29d) {
477                         if (get_user(*((__u16 *) (opcode+2)), location+1))
478                                 return;
479                         signal = math_emu_lfpc(opcode, regs);
480 #endif
481                 } else
482                         signal = SIGILL;
483         } else {
484                 /*
485                  * If we get an illegal op in kernel mode, send it through the
486                  * kprobes notifier. If kprobes doesn't pick it up, SIGILL
487                  */
488                 if (notify_die(DIE_BPT, "bpt", regs, interruption_code,
489                                3, SIGTRAP) != NOTIFY_STOP)
490                         signal = SIGILL;
491         }
492
493 #ifdef CONFIG_MATHEMU
494         if (signal == SIGFPE)
495                 do_fp_trap(regs, location,
496                            current->thread.fp_regs.fpc, interruption_code);
497         else if (signal == SIGSEGV) {
498                 info.si_signo = signal;
499                 info.si_errno = 0;
500                 info.si_code = SEGV_MAPERR;
501                 info.si_addr = (void __user *) location;
502                 do_trap(interruption_code, signal,
503                         "user address fault", regs, &info);
504         } else
505 #endif
506         if (signal) {
507                 info.si_signo = signal;
508                 info.si_errno = 0;
509                 info.si_code = ILL_ILLOPC;
510                 info.si_addr = (void __user *) location;
511                 do_trap(interruption_code, signal,
512                         "illegal operation", regs, &info);
513         }
514 }
515
516
517 #ifdef CONFIG_MATHEMU
518 asmlinkage void 
519 specification_exception(struct pt_regs * regs, long interruption_code)
520 {
521         __u8 opcode[6];
522         __u16 __user *location = NULL;
523         int signal = 0;
524
525         location = (__u16 __user *) get_check_address(regs);
526
527         /*
528          * We got all needed information from the lowcore and can
529          * now safely switch on interrupts.
530          */
531         if (regs->psw.mask & PSW_MASK_PSTATE)
532                 local_irq_enable();
533
534         if (regs->psw.mask & PSW_MASK_PSTATE) {
535                 get_user(*((__u16 *) opcode), location);
536                 switch (opcode[0]) {
537                 case 0x28: /* LDR Rx,Ry   */
538                         signal = math_emu_ldr(opcode);
539                         break;
540                 case 0x38: /* LER Rx,Ry   */
541                         signal = math_emu_ler(opcode);
542                         break;
543                 case 0x60: /* STD R,D(X,B) */
544                         get_user(*((__u16 *) (opcode+2)), location+1);
545                         signal = math_emu_std(opcode, regs);
546                         break;
547                 case 0x68: /* LD R,D(X,B) */
548                         get_user(*((__u16 *) (opcode+2)), location+1);
549                         signal = math_emu_ld(opcode, regs);
550                         break;
551                 case 0x70: /* STE R,D(X,B) */
552                         get_user(*((__u16 *) (opcode+2)), location+1);
553                         signal = math_emu_ste(opcode, regs);
554                         break;
555                 case 0x78: /* LE R,D(X,B) */
556                         get_user(*((__u16 *) (opcode+2)), location+1);
557                         signal = math_emu_le(opcode, regs);
558                         break;
559                 default:
560                         signal = SIGILL;
561                         break;
562                 }
563         } else
564                 signal = SIGILL;
565
566         if (signal == SIGFPE)
567                 do_fp_trap(regs, location,
568                            current->thread.fp_regs.fpc, interruption_code);
569         else if (signal) {
570                 siginfo_t info;
571                 info.si_signo = signal;
572                 info.si_errno = 0;
573                 info.si_code = ILL_ILLOPN;
574                 info.si_addr = location;
575                 do_trap(interruption_code, signal, 
576                         "specification exception", regs, &info);
577         }
578 }
579 #else
580 DO_ERROR_INFO(SIGILL, "specification exception", specification_exception,
581               ILL_ILLOPN, get_check_address(regs));
582 #endif
583
584 static void data_exception(struct pt_regs * regs, long interruption_code)
585 {
586         __u16 __user *location;
587         int signal = 0;
588
589         location = get_check_address(regs);
590
591         /*
592          * We got all needed information from the lowcore and can
593          * now safely switch on interrupts.
594          */
595         if (regs->psw.mask & PSW_MASK_PSTATE)
596                 local_irq_enable();
597
598         if (MACHINE_HAS_IEEE)
599                 asm volatile("stfpc %0" : "=m" (current->thread.fp_regs.fpc));
600
601 #ifdef CONFIG_MATHEMU
602         else if (regs->psw.mask & PSW_MASK_PSTATE) {
603                 __u8 opcode[6];
604                 get_user(*((__u16 *) opcode), location);
605                 switch (opcode[0]) {
606                 case 0x28: /* LDR Rx,Ry   */
607                         signal = math_emu_ldr(opcode);
608                         break;
609                 case 0x38: /* LER Rx,Ry   */
610                         signal = math_emu_ler(opcode);
611                         break;
612                 case 0x60: /* STD R,D(X,B) */
613                         get_user(*((__u16 *) (opcode+2)), location+1);
614                         signal = math_emu_std(opcode, regs);
615                         break;
616                 case 0x68: /* LD R,D(X,B) */
617                         get_user(*((__u16 *) (opcode+2)), location+1);
618                         signal = math_emu_ld(opcode, regs);
619                         break;
620                 case 0x70: /* STE R,D(X,B) */
621                         get_user(*((__u16 *) (opcode+2)), location+1);
622                         signal = math_emu_ste(opcode, regs);
623                         break;
624                 case 0x78: /* LE R,D(X,B) */
625                         get_user(*((__u16 *) (opcode+2)), location+1);
626                         signal = math_emu_le(opcode, regs);
627                         break;
628                 case 0xb3:
629                         get_user(*((__u16 *) (opcode+2)), location+1);
630                         signal = math_emu_b3(opcode, regs);
631                         break;
632                 case 0xed:
633                         get_user(*((__u32 *) (opcode+2)),
634                                  (__u32 __user *)(location+1));
635                         signal = math_emu_ed(opcode, regs);
636                         break;
637                 case 0xb2:
638                         if (opcode[1] == 0x99) {
639                                 get_user(*((__u16 *) (opcode+2)), location+1);
640                                 signal = math_emu_srnm(opcode, regs);
641                         } else if (opcode[1] == 0x9c) {
642                                 get_user(*((__u16 *) (opcode+2)), location+1);
643                                 signal = math_emu_stfpc(opcode, regs);
644                         } else if (opcode[1] == 0x9d) {
645                                 get_user(*((__u16 *) (opcode+2)), location+1);
646                                 signal = math_emu_lfpc(opcode, regs);
647                         } else
648                                 signal = SIGILL;
649                         break;
650                 default:
651                         signal = SIGILL;
652                         break;
653                 }
654         }
655 #endif 
656         if (current->thread.fp_regs.fpc & FPC_DXC_MASK)
657                 signal = SIGFPE;
658         else
659                 signal = SIGILL;
660         if (signal == SIGFPE)
661                 do_fp_trap(regs, location,
662                            current->thread.fp_regs.fpc, interruption_code);
663         else if (signal) {
664                 siginfo_t info;
665                 info.si_signo = signal;
666                 info.si_errno = 0;
667                 info.si_code = ILL_ILLOPN;
668                 info.si_addr = location;
669                 do_trap(interruption_code, signal, 
670                         "data exception", regs, &info);
671         }
672 }
673
674 static void space_switch_exception(struct pt_regs * regs, long int_code)
675 {
676         siginfo_t info;
677
678         /* Set user psw back to home space mode. */
679         if (regs->psw.mask & PSW_MASK_PSTATE)
680                 regs->psw.mask |= PSW_ASC_HOME;
681         /* Send SIGILL. */
682         info.si_signo = SIGILL;
683         info.si_errno = 0;
684         info.si_code = ILL_PRVOPC;
685         info.si_addr = get_check_address(regs);
686         do_trap(int_code, SIGILL, "space switch event", regs, &info);
687 }
688
689 asmlinkage void kernel_stack_overflow(struct pt_regs * regs)
690 {
691         bust_spinlocks(1);
692         printk("Kernel stack overflow.\n");
693         show_regs(regs);
694         bust_spinlocks(0);
695         panic("Corrupt kernel stack, can't continue.");
696 }
697
698 /* init is done in lowcore.S and head.S */
699
700 void __init trap_init(void)
701 {
702         int i;
703
704         for (i = 0; i < 128; i++)
705           pgm_check_table[i] = &default_trap_handler;
706         pgm_check_table[1] = &illegal_op;
707         pgm_check_table[2] = &privileged_op;
708         pgm_check_table[3] = &execute_exception;
709         pgm_check_table[4] = &do_protection_exception;
710         pgm_check_table[5] = &addressing_exception;
711         pgm_check_table[6] = &specification_exception;
712         pgm_check_table[7] = &data_exception;
713         pgm_check_table[8] = &overflow_exception;
714         pgm_check_table[9] = &divide_exception;
715         pgm_check_table[0x0A] = &overflow_exception;
716         pgm_check_table[0x0B] = &divide_exception;
717         pgm_check_table[0x0C] = &hfp_overflow_exception;
718         pgm_check_table[0x0D] = &hfp_underflow_exception;
719         pgm_check_table[0x0E] = &hfp_significance_exception;
720         pgm_check_table[0x0F] = &hfp_divide_exception;
721         pgm_check_table[0x10] = &do_dat_exception;
722         pgm_check_table[0x11] = &do_dat_exception;
723         pgm_check_table[0x12] = &translation_exception;
724         pgm_check_table[0x13] = &special_op_exception;
725 #ifdef CONFIG_64BIT
726         pgm_check_table[0x38] = &do_dat_exception;
727         pgm_check_table[0x39] = &do_dat_exception;
728         pgm_check_table[0x3A] = &do_dat_exception;
729         pgm_check_table[0x3B] = &do_dat_exception;
730 #endif /* CONFIG_64BIT */
731         pgm_check_table[0x15] = &operand_exception;
732         pgm_check_table[0x1C] = &space_switch_exception;
733         pgm_check_table[0x1D] = &hfp_sqrt_exception;
734         pgm_check_table[0x40] = &do_monitor_call;
735         pfault_irq_init();
736 }