Merge branch 'upstream-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/ieee13...
[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
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 #ifdef CONFIG_PFAULT
62 extern int pfault_init(void);
63 extern void pfault_fini(void);
64 extern void pfault_interrupt(__u16 error_code);
65 static ext_int_info_t ext_int_pfault;
66 #endif
67 extern pgm_check_handler_t do_monitor_call;
68
69 #define stack_pointer ({ void **sp; asm("la %0,0(15)" : "=&d" (sp)); sp; })
70
71 #ifndef CONFIG_64BIT
72 #define FOURLONG "%08lx %08lx %08lx %08lx\n"
73 static int kstack_depth_to_print = 12;
74 #else /* CONFIG_64BIT */
75 #define FOURLONG "%016lx %016lx %016lx %016lx\n"
76 static int kstack_depth_to_print = 20;
77 #endif /* CONFIG_64BIT */
78
79 ATOMIC_NOTIFIER_HEAD(s390die_chain);
80
81 int register_die_notifier(struct notifier_block *nb)
82 {
83         return atomic_notifier_chain_register(&s390die_chain, nb);
84 }
85 EXPORT_SYMBOL(register_die_notifier);
86
87 int unregister_die_notifier(struct notifier_block *nb)
88 {
89         return atomic_notifier_chain_unregister(&s390die_chain, nb);
90 }
91 EXPORT_SYMBOL(unregister_die_notifier);
92
93 /*
94  * For show_trace we have tree different stack to consider:
95  *   - the panic stack which is used if the kernel stack has overflown
96  *   - the asynchronous interrupt stack (cpu related)
97  *   - the synchronous kernel stack (process related)
98  * The stack trace can start at any of the three stack and can potentially
99  * touch all of them. The order is: panic stack, async stack, sync stack.
100  */
101 static unsigned long
102 __show_trace(unsigned long sp, unsigned long low, unsigned long high)
103 {
104         struct stack_frame *sf;
105         struct pt_regs *regs;
106
107         while (1) {
108                 sp = sp & PSW_ADDR_INSN;
109                 if (sp < low || sp > high - sizeof(*sf))
110                         return sp;
111                 sf = (struct stack_frame *) sp;
112                 printk("([<%016lx>] ", sf->gprs[8] & PSW_ADDR_INSN);
113                 print_symbol("%s)\n", sf->gprs[8] & PSW_ADDR_INSN);
114                 /* Follow the backchain. */
115                 while (1) {
116                         low = sp;
117                         sp = sf->back_chain & PSW_ADDR_INSN;
118                         if (!sp)
119                                 break;
120                         if (sp <= low || sp > high - sizeof(*sf))
121                                 return sp;
122                         sf = (struct stack_frame *) sp;
123                         printk(" [<%016lx>] ", sf->gprs[8] & PSW_ADDR_INSN);
124                         print_symbol("%s\n", sf->gprs[8] & PSW_ADDR_INSN);
125                 }
126                 /* Zero backchain detected, check for interrupt frame. */
127                 sp = (unsigned long) (sf + 1);
128                 if (sp <= low || sp > high - sizeof(*regs))
129                         return sp;
130                 regs = (struct pt_regs *) sp;
131                 printk(" [<%016lx>] ", regs->psw.addr & PSW_ADDR_INSN);
132                 print_symbol("%s\n", regs->psw.addr & PSW_ADDR_INSN);
133                 low = sp;
134                 sp = regs->gprs[15];
135         }
136 }
137
138 void show_trace(struct task_struct *task, unsigned long * stack)
139 {
140         register unsigned long __r15 asm ("15");
141         unsigned long sp;
142
143         sp = (unsigned long) stack;
144         if (!sp)
145                 sp = task ? task->thread.ksp : __r15;
146         printk("Call Trace:\n");
147 #ifdef CONFIG_CHECK_STACK
148         sp = __show_trace(sp, S390_lowcore.panic_stack - 4096,
149                           S390_lowcore.panic_stack);
150 #endif
151         sp = __show_trace(sp, S390_lowcore.async_stack - ASYNC_SIZE,
152                           S390_lowcore.async_stack);
153         if (task)
154                 __show_trace(sp, (unsigned long) task_stack_page(task),
155                              (unsigned long) task_stack_page(task) + THREAD_SIZE);
156         else
157                 __show_trace(sp, S390_lowcore.thread_info,
158                              S390_lowcore.thread_info + THREAD_SIZE);
159         printk("\n");
160 }
161
162 void show_stack(struct task_struct *task, unsigned long *sp)
163 {
164         register unsigned long * __r15 asm ("15");
165         unsigned long *stack;
166         int i;
167
168         if (!sp)
169                 stack = task ? (unsigned long *) task->thread.ksp : __r15;
170         else
171                 stack = sp;
172
173         for (i = 0; i < kstack_depth_to_print; i++) {
174                 if (((addr_t) stack & (THREAD_SIZE-1)) == 0)
175                         break;
176                 if (i && ((i * sizeof (long) % 32) == 0))
177                         printk("\n       ");
178                 printk("%p ", (void *)*stack++);
179         }
180         printk("\n");
181         show_trace(task, sp);
182 }
183
184 /*
185  * The architecture-independent dump_stack generator
186  */
187 void dump_stack(void)
188 {
189         show_stack(NULL, NULL);
190 }
191
192 EXPORT_SYMBOL(dump_stack);
193
194 void show_registers(struct pt_regs *regs)
195 {
196         mm_segment_t old_fs;
197         char *mode;
198         int i;
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("%s GPRS: " FOURLONG, mode,
206                regs->gprs[0], regs->gprs[1], regs->gprs[2], regs->gprs[3]);
207         printk("           " FOURLONG,
208                regs->gprs[4], regs->gprs[5], regs->gprs[6], regs->gprs[7]);
209         printk("           " FOURLONG,
210                regs->gprs[8], regs->gprs[9], regs->gprs[10], regs->gprs[11]);
211         printk("           " FOURLONG,
212                regs->gprs[12], regs->gprs[13], regs->gprs[14], regs->gprs[15]);
213
214 #if 0
215         /* FIXME: this isn't needed any more but it changes the ksymoops
216          * input. To remove or not to remove ... */
217         save_access_regs(regs->acrs);
218         printk("%s ACRS: %08x %08x %08x %08x\n", mode,
219                regs->acrs[0], regs->acrs[1], regs->acrs[2], regs->acrs[3]);
220         printk("           %08x %08x %08x %08x\n",
221                regs->acrs[4], regs->acrs[5], regs->acrs[6], regs->acrs[7]);
222         printk("           %08x %08x %08x %08x\n",
223                regs->acrs[8], regs->acrs[9], regs->acrs[10], regs->acrs[11]);
224         printk("           %08x %08x %08x %08x\n",
225                regs->acrs[12], regs->acrs[13], regs->acrs[14], regs->acrs[15]);
226 #endif
227
228         /*
229          * Print the first 20 byte of the instruction stream at the
230          * time of the fault.
231          */
232         old_fs = get_fs();
233         if (regs->psw.mask & PSW_MASK_PSTATE)
234                 set_fs(USER_DS);
235         else
236                 set_fs(KERNEL_DS);
237         printk("%s Code: ", mode);
238         for (i = 0; i < 20; i++) {
239                 unsigned char c;
240                 if (__get_user(c, (char __user *)(regs->psw.addr + i))) {
241                         printk(" Bad PSW.");
242                         break;
243                 }
244                 printk("%02x ", c);
245         }
246         set_fs(old_fs);
247
248         printk("\n");
249 }       
250
251 /* This is called from fs/proc/array.c */
252 char *task_show_regs(struct task_struct *task, char *buffer)
253 {
254         struct pt_regs *regs;
255
256         regs = task_pt_regs(task);
257         buffer += sprintf(buffer, "task: %p, ksp: %p\n",
258                        task, (void *)task->thread.ksp);
259         buffer += sprintf(buffer, "User PSW : %p %p\n",
260                        (void *) regs->psw.mask, (void *)regs->psw.addr);
261
262         buffer += sprintf(buffer, "User GPRS: " FOURLONG,
263                           regs->gprs[0], regs->gprs[1],
264                           regs->gprs[2], regs->gprs[3]);
265         buffer += sprintf(buffer, "           " FOURLONG,
266                           regs->gprs[4], regs->gprs[5],
267                           regs->gprs[6], regs->gprs[7]);
268         buffer += sprintf(buffer, "           " FOURLONG,
269                           regs->gprs[8], regs->gprs[9],
270                           regs->gprs[10], regs->gprs[11]);
271         buffer += sprintf(buffer, "           " FOURLONG,
272                           regs->gprs[12], regs->gprs[13],
273                           regs->gprs[14], regs->gprs[15]);
274         buffer += sprintf(buffer, "User ACRS: %08x %08x %08x %08x\n",
275                           task->thread.acrs[0], task->thread.acrs[1],
276                           task->thread.acrs[2], task->thread.acrs[3]);
277         buffer += sprintf(buffer, "           %08x %08x %08x %08x\n",
278                           task->thread.acrs[4], task->thread.acrs[5],
279                           task->thread.acrs[6], task->thread.acrs[7]);
280         buffer += sprintf(buffer, "           %08x %08x %08x %08x\n",
281                           task->thread.acrs[8], task->thread.acrs[9],
282                           task->thread.acrs[10], task->thread.acrs[11]);
283         buffer += sprintf(buffer, "           %08x %08x %08x %08x\n",
284                           task->thread.acrs[12], task->thread.acrs[13],
285                           task->thread.acrs[14], task->thread.acrs[15]);
286         return buffer;
287 }
288
289 DEFINE_SPINLOCK(die_lock);
290
291 void die(const char * str, struct pt_regs * regs, long err)
292 {
293         static int die_counter;
294
295         debug_stop_all();
296         console_verbose();
297         spin_lock_irq(&die_lock);
298         bust_spinlocks(1);
299         printk("%s: %04lx [#%d]\n", str, err & 0xffff, ++die_counter);
300         show_regs(regs);
301         bust_spinlocks(0);
302         spin_unlock_irq(&die_lock);
303         if (in_interrupt())
304                 panic("Fatal exception in interrupt");
305         if (panic_on_oops)
306                 panic("Fatal exception: panic_on_oops");
307         do_exit(SIGSEGV);
308 }
309
310 static void inline
311 report_user_fault(long interruption_code, struct pt_regs *regs)
312 {
313 #if defined(CONFIG_SYSCTL)
314         if (!sysctl_userprocess_debug)
315                 return;
316 #endif
317 #if defined(CONFIG_SYSCTL) || defined(CONFIG_PROCESS_DEBUG)
318         printk("User process fault: interruption code 0x%lX\n",
319                interruption_code);
320         show_regs(regs);
321 #endif
322 }
323
324 static void __kprobes inline do_trap(long interruption_code, int signr,
325                                         char *str, struct pt_regs *regs,
326                                         siginfo_t *info)
327 {
328         /*
329          * We got all needed information from the lowcore and can
330          * now safely switch on interrupts.
331          */
332         if (regs->psw.mask & PSW_MASK_PSTATE)
333                 local_irq_enable();
334
335         if (notify_die(DIE_TRAP, str, regs, interruption_code,
336                                 interruption_code, signr) == NOTIFY_STOP)
337                 return;
338
339         if (regs->psw.mask & PSW_MASK_PSTATE) {
340                 struct task_struct *tsk = current;
341
342                 tsk->thread.trap_no = interruption_code & 0xffff;
343                 force_sig_info(signr, info, tsk);
344                 report_user_fault(interruption_code, regs);
345         } else {
346                 const struct exception_table_entry *fixup;
347                 fixup = search_exception_tables(regs->psw.addr & PSW_ADDR_INSN);
348                 if (fixup)
349                         regs->psw.addr = fixup->fixup | PSW_ADDR_AMODE;
350                 else
351                         die(str, regs, interruption_code);
352         }
353 }
354
355 static inline void __user *get_check_address(struct pt_regs *regs)
356 {
357         return (void __user *)((regs->psw.addr-S390_lowcore.pgm_ilc) & PSW_ADDR_INSN);
358 }
359
360 void __kprobes do_single_step(struct pt_regs *regs)
361 {
362         if (notify_die(DIE_SSTEP, "sstep", regs, 0, 0,
363                                         SIGTRAP) == NOTIFY_STOP){
364                 return;
365         }
366         if ((current->ptrace & PT_PTRACED) != 0)
367                 force_sig(SIGTRAP, current);
368 }
369
370 asmlinkage void
371 default_trap_handler(struct pt_regs * regs, long interruption_code)
372 {
373         if (regs->psw.mask & PSW_MASK_PSTATE) {
374                 local_irq_enable();
375                 do_exit(SIGSEGV);
376                 report_user_fault(interruption_code, regs);
377         } else
378                 die("Unknown program exception", regs, interruption_code);
379 }
380
381 #define DO_ERROR_INFO(signr, str, name, sicode, siaddr) \
382 asmlinkage void name(struct pt_regs * regs, long interruption_code) \
383 { \
384         siginfo_t info; \
385         info.si_signo = signr; \
386         info.si_errno = 0; \
387         info.si_code = sicode; \
388         info.si_addr = siaddr; \
389         do_trap(interruption_code, signr, str, regs, &info); \
390 }
391
392 DO_ERROR_INFO(SIGILL, "addressing exception", addressing_exception,
393               ILL_ILLADR, get_check_address(regs))
394 DO_ERROR_INFO(SIGILL,  "execute exception", execute_exception,
395               ILL_ILLOPN, get_check_address(regs))
396 DO_ERROR_INFO(SIGFPE,  "fixpoint divide exception", divide_exception,
397               FPE_INTDIV, get_check_address(regs))
398 DO_ERROR_INFO(SIGFPE,  "fixpoint overflow exception", overflow_exception,
399               FPE_INTOVF, get_check_address(regs))
400 DO_ERROR_INFO(SIGFPE,  "HFP overflow exception", hfp_overflow_exception,
401               FPE_FLTOVF, get_check_address(regs))
402 DO_ERROR_INFO(SIGFPE,  "HFP underflow exception", hfp_underflow_exception,
403               FPE_FLTUND, get_check_address(regs))
404 DO_ERROR_INFO(SIGFPE,  "HFP significance exception", hfp_significance_exception,
405               FPE_FLTRES, get_check_address(regs))
406 DO_ERROR_INFO(SIGFPE,  "HFP divide exception", hfp_divide_exception,
407               FPE_FLTDIV, get_check_address(regs))
408 DO_ERROR_INFO(SIGFPE,  "HFP square root exception", hfp_sqrt_exception,
409               FPE_FLTINV, get_check_address(regs))
410 DO_ERROR_INFO(SIGILL,  "operand exception", operand_exception,
411               ILL_ILLOPN, get_check_address(regs))
412 DO_ERROR_INFO(SIGILL,  "privileged operation", privileged_op,
413               ILL_PRVOPC, get_check_address(regs))
414 DO_ERROR_INFO(SIGILL,  "special operation exception", special_op_exception,
415               ILL_ILLOPN, get_check_address(regs))
416 DO_ERROR_INFO(SIGILL,  "translation exception", translation_exception,
417               ILL_ILLOPN, get_check_address(regs))
418
419 static inline void
420 do_fp_trap(struct pt_regs *regs, void __user *location,
421            int fpc, long interruption_code)
422 {
423         siginfo_t si;
424
425         si.si_signo = SIGFPE;
426         si.si_errno = 0;
427         si.si_addr = location;
428         si.si_code = 0;
429         /* FPC[2] is Data Exception Code */
430         if ((fpc & 0x00000300) == 0) {
431                 /* bits 6 and 7 of DXC are 0 iff IEEE exception */
432                 if (fpc & 0x8000) /* invalid fp operation */
433                         si.si_code = FPE_FLTINV;
434                 else if (fpc & 0x4000) /* div by 0 */
435                         si.si_code = FPE_FLTDIV;
436                 else if (fpc & 0x2000) /* overflow */
437                         si.si_code = FPE_FLTOVF;
438                 else if (fpc & 0x1000) /* underflow */
439                         si.si_code = FPE_FLTUND;
440                 else if (fpc & 0x0800) /* inexact */
441                         si.si_code = FPE_FLTRES;
442         }
443         current->thread.ieee_instruction_pointer = (addr_t) location;
444         do_trap(interruption_code, SIGFPE,
445                 "floating point exception", regs, &si);
446 }
447
448 asmlinkage void illegal_op(struct pt_regs * regs, long interruption_code)
449 {
450         siginfo_t info;
451         __u8 opcode[6];
452         __u16 __user *location;
453         int signal = 0;
454
455         location = get_check_address(regs);
456
457         /*
458          * We got all needed information from the lowcore and can
459          * now safely switch on interrupts.
460          */
461         if (regs->psw.mask & PSW_MASK_PSTATE)
462                 local_irq_enable();
463
464         if (regs->psw.mask & PSW_MASK_PSTATE) {
465                 get_user(*((__u16 *) opcode), (__u16 __user *) location);
466                 if (*((__u16 *) opcode) == S390_BREAKPOINT_U16) {
467                         if (current->ptrace & PT_PTRACED)
468                                 force_sig(SIGTRAP, current);
469                         else
470                                 signal = SIGILL;
471 #ifdef CONFIG_MATHEMU
472                 } else if (opcode[0] == 0xb3) {
473                         get_user(*((__u16 *) (opcode+2)), location+1);
474                         signal = math_emu_b3(opcode, regs);
475                 } else if (opcode[0] == 0xed) {
476                         get_user(*((__u32 *) (opcode+2)),
477                                  (__u32 *)(location+1));
478                         signal = math_emu_ed(opcode, regs);
479                 } else if (*((__u16 *) opcode) == 0xb299) {
480                         get_user(*((__u16 *) (opcode+2)), location+1);
481                         signal = math_emu_srnm(opcode, regs);
482                 } else if (*((__u16 *) opcode) == 0xb29c) {
483                         get_user(*((__u16 *) (opcode+2)), location+1);
484                         signal = math_emu_stfpc(opcode, regs);
485                 } else if (*((__u16 *) opcode) == 0xb29d) {
486                         get_user(*((__u16 *) (opcode+2)), location+1);
487                         signal = math_emu_lfpc(opcode, regs);
488 #endif
489                 } else
490                         signal = SIGILL;
491         } else
492                 signal = SIGILL;
493
494 #ifdef CONFIG_MATHEMU
495         if (signal == SIGFPE)
496                 do_fp_trap(regs, location,
497                            current->thread.fp_regs.fpc, interruption_code);
498         else if (signal == SIGSEGV) {
499                 info.si_signo = signal;
500                 info.si_errno = 0;
501                 info.si_code = SEGV_MAPERR;
502                 info.si_addr = (void *) location;
503                 do_trap(interruption_code, signal,
504                         "user address fault", regs, &info);
505         } else
506 #endif
507         if (signal) {
508                 info.si_signo = signal;
509                 info.si_errno = 0;
510                 info.si_code = ILL_ILLOPC;
511                 info.si_addr = (void __user *) location;
512                 do_trap(interruption_code, signal,
513                         "illegal operation", regs, &info);
514         }
515 }
516
517
518 #ifdef CONFIG_MATHEMU
519 asmlinkage void 
520 specification_exception(struct pt_regs * regs, long interruption_code)
521 {
522         __u8 opcode[6];
523         __u16 *location = NULL;
524         int signal = 0;
525
526         location = (__u16 *) get_check_address(regs);
527
528         /*
529          * We got all needed information from the lowcore and can
530          * now safely switch on interrupts.
531          */
532         if (regs->psw.mask & PSW_MASK_PSTATE)
533                 local_irq_enable();
534
535         if (regs->psw.mask & PSW_MASK_PSTATE) {
536                 get_user(*((__u16 *) opcode), location);
537                 switch (opcode[0]) {
538                 case 0x28: /* LDR Rx,Ry   */
539                         signal = math_emu_ldr(opcode);
540                         break;
541                 case 0x38: /* LER Rx,Ry   */
542                         signal = math_emu_ler(opcode);
543                         break;
544                 case 0x60: /* STD R,D(X,B) */
545                         get_user(*((__u16 *) (opcode+2)), location+1);
546                         signal = math_emu_std(opcode, regs);
547                         break;
548                 case 0x68: /* LD R,D(X,B) */
549                         get_user(*((__u16 *) (opcode+2)), location+1);
550                         signal = math_emu_ld(opcode, regs);
551                         break;
552                 case 0x70: /* STE R,D(X,B) */
553                         get_user(*((__u16 *) (opcode+2)), location+1);
554                         signal = math_emu_ste(opcode, regs);
555                         break;
556                 case 0x78: /* LE R,D(X,B) */
557                         get_user(*((__u16 *) (opcode+2)), location+1);
558                         signal = math_emu_le(opcode, regs);
559                         break;
560                 default:
561                         signal = SIGILL;
562                         break;
563                 }
564         } else
565                 signal = SIGILL;
566
567         if (signal == SIGFPE)
568                 do_fp_trap(regs, location,
569                            current->thread.fp_regs.fpc, interruption_code);
570         else if (signal) {
571                 siginfo_t info;
572                 info.si_signo = signal;
573                 info.si_errno = 0;
574                 info.si_code = ILL_ILLOPN;
575                 info.si_addr = location;
576                 do_trap(interruption_code, signal, 
577                         "specification exception", regs, &info);
578         }
579 }
580 #else
581 DO_ERROR_INFO(SIGILL, "specification exception", specification_exception,
582               ILL_ILLOPN, get_check_address(regs));
583 #endif
584
585 asmlinkage void data_exception(struct pt_regs * regs, long interruption_code)
586 {
587         __u16 __user *location;
588         int signal = 0;
589
590         location = get_check_address(regs);
591
592         /*
593          * We got all needed information from the lowcore and can
594          * now safely switch on interrupts.
595          */
596         if (regs->psw.mask & PSW_MASK_PSTATE)
597                 local_irq_enable();
598
599         if (MACHINE_HAS_IEEE)
600                 asm volatile("stfpc %0" : "=m" (current->thread.fp_regs.fpc));
601
602 #ifdef CONFIG_MATHEMU
603         else if (regs->psw.mask & PSW_MASK_PSTATE) {
604                 __u8 opcode[6];
605                 get_user(*((__u16 *) opcode), location);
606                 switch (opcode[0]) {
607                 case 0x28: /* LDR Rx,Ry   */
608                         signal = math_emu_ldr(opcode);
609                         break;
610                 case 0x38: /* LER Rx,Ry   */
611                         signal = math_emu_ler(opcode);
612                         break;
613                 case 0x60: /* STD R,D(X,B) */
614                         get_user(*((__u16 *) (opcode+2)), location+1);
615                         signal = math_emu_std(opcode, regs);
616                         break;
617                 case 0x68: /* LD R,D(X,B) */
618                         get_user(*((__u16 *) (opcode+2)), location+1);
619                         signal = math_emu_ld(opcode, regs);
620                         break;
621                 case 0x70: /* STE R,D(X,B) */
622                         get_user(*((__u16 *) (opcode+2)), location+1);
623                         signal = math_emu_ste(opcode, regs);
624                         break;
625                 case 0x78: /* LE R,D(X,B) */
626                         get_user(*((__u16 *) (opcode+2)), location+1);
627                         signal = math_emu_le(opcode, regs);
628                         break;
629                 case 0xb3:
630                         get_user(*((__u16 *) (opcode+2)), location+1);
631                         signal = math_emu_b3(opcode, regs);
632                         break;
633                 case 0xed:
634                         get_user(*((__u32 *) (opcode+2)),
635                                  (__u32 *)(location+1));
636                         signal = math_emu_ed(opcode, regs);
637                         break;
638                 case 0xb2:
639                         if (opcode[1] == 0x99) {
640                                 get_user(*((__u16 *) (opcode+2)), location+1);
641                                 signal = math_emu_srnm(opcode, regs);
642                         } else if (opcode[1] == 0x9c) {
643                                 get_user(*((__u16 *) (opcode+2)), location+1);
644                                 signal = math_emu_stfpc(opcode, regs);
645                         } else if (opcode[1] == 0x9d) {
646                                 get_user(*((__u16 *) (opcode+2)), location+1);
647                                 signal = math_emu_lfpc(opcode, regs);
648                         } else
649                                 signal = SIGILL;
650                         break;
651                 default:
652                         signal = SIGILL;
653                         break;
654                 }
655         }
656 #endif 
657         if (current->thread.fp_regs.fpc & FPC_DXC_MASK)
658                 signal = SIGFPE;
659         else
660                 signal = SIGILL;
661         if (signal == SIGFPE)
662                 do_fp_trap(regs, location,
663                            current->thread.fp_regs.fpc, interruption_code);
664         else if (signal) {
665                 siginfo_t info;
666                 info.si_signo = signal;
667                 info.si_errno = 0;
668                 info.si_code = ILL_ILLOPN;
669                 info.si_addr = location;
670                 do_trap(interruption_code, signal, 
671                         "data exception", regs, &info);
672         }
673 }
674
675 asmlinkage void space_switch_exception(struct pt_regs * regs, long int_code)
676 {
677         siginfo_t info;
678
679         /* Set user psw back to home space mode. */
680         if (regs->psw.mask & PSW_MASK_PSTATE)
681                 regs->psw.mask |= PSW_ASC_HOME;
682         /* Send SIGILL. */
683         info.si_signo = SIGILL;
684         info.si_errno = 0;
685         info.si_code = ILL_PRVOPC;
686         info.si_addr = get_check_address(regs);
687         do_trap(int_code, SIGILL, "space switch event", regs, &info);
688 }
689
690 asmlinkage void kernel_stack_overflow(struct pt_regs * regs)
691 {
692         bust_spinlocks(1);
693         printk("Kernel stack overflow.\n");
694         show_regs(regs);
695         bust_spinlocks(0);
696         panic("Corrupt kernel stack, can't continue.");
697 }
698
699 /* init is done in lowcore.S and head.S */
700
701 void __init trap_init(void)
702 {
703         int i;
704
705         for (i = 0; i < 128; i++)
706           pgm_check_table[i] = &default_trap_handler;
707         pgm_check_table[1] = &illegal_op;
708         pgm_check_table[2] = &privileged_op;
709         pgm_check_table[3] = &execute_exception;
710         pgm_check_table[4] = &do_protection_exception;
711         pgm_check_table[5] = &addressing_exception;
712         pgm_check_table[6] = &specification_exception;
713         pgm_check_table[7] = &data_exception;
714         pgm_check_table[8] = &overflow_exception;
715         pgm_check_table[9] = &divide_exception;
716         pgm_check_table[0x0A] = &overflow_exception;
717         pgm_check_table[0x0B] = &divide_exception;
718         pgm_check_table[0x0C] = &hfp_overflow_exception;
719         pgm_check_table[0x0D] = &hfp_underflow_exception;
720         pgm_check_table[0x0E] = &hfp_significance_exception;
721         pgm_check_table[0x0F] = &hfp_divide_exception;
722         pgm_check_table[0x10] = &do_dat_exception;
723         pgm_check_table[0x11] = &do_dat_exception;
724         pgm_check_table[0x12] = &translation_exception;
725         pgm_check_table[0x13] = &special_op_exception;
726 #ifdef CONFIG_64BIT
727         pgm_check_table[0x38] = &do_dat_exception;
728         pgm_check_table[0x39] = &do_dat_exception;
729         pgm_check_table[0x3A] = &do_dat_exception;
730         pgm_check_table[0x3B] = &do_dat_exception;
731 #endif /* CONFIG_64BIT */
732         pgm_check_table[0x15] = &operand_exception;
733         pgm_check_table[0x1C] = &space_switch_exception;
734         pgm_check_table[0x1D] = &hfp_sqrt_exception;
735         pgm_check_table[0x40] = &do_monitor_call;
736
737         if (MACHINE_IS_VM) {
738 #ifdef CONFIG_PFAULT
739                 /*
740                  * Try to get pfault pseudo page faults going.
741                  */
742                 if (register_early_external_interrupt(0x2603, pfault_interrupt,
743                                                       &ext_int_pfault) != 0)
744                         panic("Couldn't request external interrupt 0x2603");
745
746                 if (pfault_init() == 0) 
747                         return;
748                 
749                 /* Tough luck, no pfault. */
750                 unregister_early_external_interrupt(0x2603, pfault_interrupt,
751                                                     &ext_int_pfault);
752 #endif
753         }
754 }