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