Report that kernel is tainted if there was an OOPS
[linux-2.6.git] / 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         show_regs(regs);
264         bust_spinlocks(0);
265         add_taint(TAINT_DIE);
266         spin_unlock_irq(&die_lock);
267         if (in_interrupt())
268                 panic("Fatal exception in interrupt");
269         if (panic_on_oops)
270                 panic("Fatal exception: panic_on_oops");
271         oops_exit();
272         do_exit(SIGSEGV);
273 }
274
275 static void inline
276 report_user_fault(long interruption_code, struct pt_regs *regs)
277 {
278 #if defined(CONFIG_SYSCTL)
279         if (!sysctl_userprocess_debug)
280                 return;
281 #endif
282 #if defined(CONFIG_SYSCTL) || defined(CONFIG_PROCESS_DEBUG)
283         printk("User process fault: interruption code 0x%lX\n",
284                interruption_code);
285         show_regs(regs);
286 #endif
287 }
288
289 int is_valid_bugaddr(unsigned long addr)
290 {
291         return 1;
292 }
293
294 static void __kprobes inline do_trap(long interruption_code, int signr,
295                                         char *str, struct pt_regs *regs,
296                                         siginfo_t *info)
297 {
298         /*
299          * We got all needed information from the lowcore and can
300          * now safely switch on interrupts.
301          */
302         if (regs->psw.mask & PSW_MASK_PSTATE)
303                 local_irq_enable();
304
305         if (notify_die(DIE_TRAP, str, regs, interruption_code,
306                                 interruption_code, signr) == NOTIFY_STOP)
307                 return;
308
309         if (regs->psw.mask & PSW_MASK_PSTATE) {
310                 struct task_struct *tsk = current;
311
312                 tsk->thread.trap_no = interruption_code & 0xffff;
313                 force_sig_info(signr, info, tsk);
314                 report_user_fault(interruption_code, regs);
315         } else {
316                 const struct exception_table_entry *fixup;
317                 fixup = search_exception_tables(regs->psw.addr & PSW_ADDR_INSN);
318                 if (fixup)
319                         regs->psw.addr = fixup->fixup | PSW_ADDR_AMODE;
320                 else {
321                         enum bug_trap_type btt;
322
323                         btt = report_bug(regs->psw.addr & PSW_ADDR_INSN, regs);
324                         if (btt == BUG_TRAP_TYPE_WARN)
325                                 return;
326                         die(str, regs, interruption_code);
327                 }
328         }
329 }
330
331 static inline void __user *get_check_address(struct pt_regs *regs)
332 {
333         return (void __user *)((regs->psw.addr-S390_lowcore.pgm_ilc) & PSW_ADDR_INSN);
334 }
335
336 void __kprobes do_single_step(struct pt_regs *regs)
337 {
338         if (notify_die(DIE_SSTEP, "sstep", regs, 0, 0,
339                                         SIGTRAP) == NOTIFY_STOP){
340                 return;
341         }
342         if ((current->ptrace & PT_PTRACED) != 0)
343                 force_sig(SIGTRAP, current);
344 }
345
346 static void default_trap_handler(struct pt_regs * regs, long interruption_code)
347 {
348         if (regs->psw.mask & PSW_MASK_PSTATE) {
349                 local_irq_enable();
350                 do_exit(SIGSEGV);
351                 report_user_fault(interruption_code, regs);
352         } else
353                 die("Unknown program exception", regs, interruption_code);
354 }
355
356 #define DO_ERROR_INFO(signr, str, name, sicode, siaddr) \
357 static void name(struct pt_regs * regs, long interruption_code) \
358 { \
359         siginfo_t info; \
360         info.si_signo = signr; \
361         info.si_errno = 0; \
362         info.si_code = sicode; \
363         info.si_addr = siaddr; \
364         do_trap(interruption_code, signr, str, regs, &info); \
365 }
366
367 DO_ERROR_INFO(SIGILL, "addressing exception", addressing_exception,
368               ILL_ILLADR, get_check_address(regs))
369 DO_ERROR_INFO(SIGILL,  "execute exception", execute_exception,
370               ILL_ILLOPN, get_check_address(regs))
371 DO_ERROR_INFO(SIGFPE,  "fixpoint divide exception", divide_exception,
372               FPE_INTDIV, get_check_address(regs))
373 DO_ERROR_INFO(SIGFPE,  "fixpoint overflow exception", overflow_exception,
374               FPE_INTOVF, get_check_address(regs))
375 DO_ERROR_INFO(SIGFPE,  "HFP overflow exception", hfp_overflow_exception,
376               FPE_FLTOVF, get_check_address(regs))
377 DO_ERROR_INFO(SIGFPE,  "HFP underflow exception", hfp_underflow_exception,
378               FPE_FLTUND, get_check_address(regs))
379 DO_ERROR_INFO(SIGFPE,  "HFP significance exception", hfp_significance_exception,
380               FPE_FLTRES, get_check_address(regs))
381 DO_ERROR_INFO(SIGFPE,  "HFP divide exception", hfp_divide_exception,
382               FPE_FLTDIV, get_check_address(regs))
383 DO_ERROR_INFO(SIGFPE,  "HFP square root exception", hfp_sqrt_exception,
384               FPE_FLTINV, get_check_address(regs))
385 DO_ERROR_INFO(SIGILL,  "operand exception", operand_exception,
386               ILL_ILLOPN, get_check_address(regs))
387 DO_ERROR_INFO(SIGILL,  "privileged operation", privileged_op,
388               ILL_PRVOPC, get_check_address(regs))
389 DO_ERROR_INFO(SIGILL,  "special operation exception", special_op_exception,
390               ILL_ILLOPN, get_check_address(regs))
391 DO_ERROR_INFO(SIGILL,  "translation exception", translation_exception,
392               ILL_ILLOPN, get_check_address(regs))
393
394 static inline void
395 do_fp_trap(struct pt_regs *regs, void __user *location,
396            int fpc, long interruption_code)
397 {
398         siginfo_t si;
399
400         si.si_signo = SIGFPE;
401         si.si_errno = 0;
402         si.si_addr = location;
403         si.si_code = 0;
404         /* FPC[2] is Data Exception Code */
405         if ((fpc & 0x00000300) == 0) {
406                 /* bits 6 and 7 of DXC are 0 iff IEEE exception */
407                 if (fpc & 0x8000) /* invalid fp operation */
408                         si.si_code = FPE_FLTINV;
409                 else if (fpc & 0x4000) /* div by 0 */
410                         si.si_code = FPE_FLTDIV;
411                 else if (fpc & 0x2000) /* overflow */
412                         si.si_code = FPE_FLTOVF;
413                 else if (fpc & 0x1000) /* underflow */
414                         si.si_code = FPE_FLTUND;
415                 else if (fpc & 0x0800) /* inexact */
416                         si.si_code = FPE_FLTRES;
417         }
418         current->thread.ieee_instruction_pointer = (addr_t) location;
419         do_trap(interruption_code, SIGFPE,
420                 "floating point exception", regs, &si);
421 }
422
423 static void illegal_op(struct pt_regs * regs, long interruption_code)
424 {
425         siginfo_t info;
426         __u8 opcode[6];
427         __u16 __user *location;
428         int signal = 0;
429
430         location = get_check_address(regs);
431
432         /*
433          * We got all needed information from the lowcore and can
434          * now safely switch on interrupts.
435          */
436         if (regs->psw.mask & PSW_MASK_PSTATE)
437                 local_irq_enable();
438
439         if (regs->psw.mask & PSW_MASK_PSTATE) {
440                 if (get_user(*((__u16 *) opcode), (__u16 __user *) location))
441                         return;
442                 if (*((__u16 *) opcode) == S390_BREAKPOINT_U16) {
443                         if (current->ptrace & PT_PTRACED)
444                                 force_sig(SIGTRAP, current);
445                         else
446                                 signal = SIGILL;
447 #ifdef CONFIG_MATHEMU
448                 } else if (opcode[0] == 0xb3) {
449                         if (get_user(*((__u16 *) (opcode+2)), location+1))
450                                 return;
451                         signal = math_emu_b3(opcode, regs);
452                 } else if (opcode[0] == 0xed) {
453                         if (get_user(*((__u32 *) (opcode+2)),
454                                      (__u32 __user *)(location+1)))
455                                 return;
456                         signal = math_emu_ed(opcode, regs);
457                 } else if (*((__u16 *) opcode) == 0xb299) {
458                         if (get_user(*((__u16 *) (opcode+2)), location+1))
459                                 return;
460                         signal = math_emu_srnm(opcode, regs);
461                 } else if (*((__u16 *) opcode) == 0xb29c) {
462                         if (get_user(*((__u16 *) (opcode+2)), location+1))
463                                 return;
464                         signal = math_emu_stfpc(opcode, regs);
465                 } else if (*((__u16 *) opcode) == 0xb29d) {
466                         if (get_user(*((__u16 *) (opcode+2)), location+1))
467                                 return;
468                         signal = math_emu_lfpc(opcode, regs);
469 #endif
470                 } else
471                         signal = SIGILL;
472         } else {
473                 /*
474                  * If we get an illegal op in kernel mode, send it through the
475                  * kprobes notifier. If kprobes doesn't pick it up, SIGILL
476                  */
477                 if (notify_die(DIE_BPT, "bpt", regs, interruption_code,
478                                3, SIGTRAP) != NOTIFY_STOP)
479                         signal = SIGILL;
480         }
481
482 #ifdef CONFIG_MATHEMU
483         if (signal == SIGFPE)
484                 do_fp_trap(regs, location,
485                            current->thread.fp_regs.fpc, interruption_code);
486         else if (signal == SIGSEGV) {
487                 info.si_signo = signal;
488                 info.si_errno = 0;
489                 info.si_code = SEGV_MAPERR;
490                 info.si_addr = (void __user *) location;
491                 do_trap(interruption_code, signal,
492                         "user address fault", regs, &info);
493         } else
494 #endif
495         if (signal) {
496                 info.si_signo = signal;
497                 info.si_errno = 0;
498                 info.si_code = ILL_ILLOPC;
499                 info.si_addr = (void __user *) location;
500                 do_trap(interruption_code, signal,
501                         "illegal operation", regs, &info);
502         }
503 }
504
505
506 #ifdef CONFIG_MATHEMU
507 asmlinkage void 
508 specification_exception(struct pt_regs * regs, long interruption_code)
509 {
510         __u8 opcode[6];
511         __u16 __user *location = NULL;
512         int signal = 0;
513
514         location = (__u16 __user *) get_check_address(regs);
515
516         /*
517          * We got all needed information from the lowcore and can
518          * now safely switch on interrupts.
519          */
520         if (regs->psw.mask & PSW_MASK_PSTATE)
521                 local_irq_enable();
522
523         if (regs->psw.mask & PSW_MASK_PSTATE) {
524                 get_user(*((__u16 *) opcode), location);
525                 switch (opcode[0]) {
526                 case 0x28: /* LDR Rx,Ry   */
527                         signal = math_emu_ldr(opcode);
528                         break;
529                 case 0x38: /* LER Rx,Ry   */
530                         signal = math_emu_ler(opcode);
531                         break;
532                 case 0x60: /* STD R,D(X,B) */
533                         get_user(*((__u16 *) (opcode+2)), location+1);
534                         signal = math_emu_std(opcode, regs);
535                         break;
536                 case 0x68: /* LD R,D(X,B) */
537                         get_user(*((__u16 *) (opcode+2)), location+1);
538                         signal = math_emu_ld(opcode, regs);
539                         break;
540                 case 0x70: /* STE R,D(X,B) */
541                         get_user(*((__u16 *) (opcode+2)), location+1);
542                         signal = math_emu_ste(opcode, regs);
543                         break;
544                 case 0x78: /* LE R,D(X,B) */
545                         get_user(*((__u16 *) (opcode+2)), location+1);
546                         signal = math_emu_le(opcode, regs);
547                         break;
548                 default:
549                         signal = SIGILL;
550                         break;
551                 }
552         } else
553                 signal = SIGILL;
554
555         if (signal == SIGFPE)
556                 do_fp_trap(regs, location,
557                            current->thread.fp_regs.fpc, interruption_code);
558         else if (signal) {
559                 siginfo_t info;
560                 info.si_signo = signal;
561                 info.si_errno = 0;
562                 info.si_code = ILL_ILLOPN;
563                 info.si_addr = location;
564                 do_trap(interruption_code, signal, 
565                         "specification exception", regs, &info);
566         }
567 }
568 #else
569 DO_ERROR_INFO(SIGILL, "specification exception", specification_exception,
570               ILL_ILLOPN, get_check_address(regs));
571 #endif
572
573 static void data_exception(struct pt_regs * regs, long interruption_code)
574 {
575         __u16 __user *location;
576         int signal = 0;
577
578         location = get_check_address(regs);
579
580         /*
581          * We got all needed information from the lowcore and can
582          * now safely switch on interrupts.
583          */
584         if (regs->psw.mask & PSW_MASK_PSTATE)
585                 local_irq_enable();
586
587         if (MACHINE_HAS_IEEE)
588                 asm volatile("stfpc %0" : "=m" (current->thread.fp_regs.fpc));
589
590 #ifdef CONFIG_MATHEMU
591         else if (regs->psw.mask & PSW_MASK_PSTATE) {
592                 __u8 opcode[6];
593                 get_user(*((__u16 *) opcode), location);
594                 switch (opcode[0]) {
595                 case 0x28: /* LDR Rx,Ry   */
596                         signal = math_emu_ldr(opcode);
597                         break;
598                 case 0x38: /* LER Rx,Ry   */
599                         signal = math_emu_ler(opcode);
600                         break;
601                 case 0x60: /* STD R,D(X,B) */
602                         get_user(*((__u16 *) (opcode+2)), location+1);
603                         signal = math_emu_std(opcode, regs);
604                         break;
605                 case 0x68: /* LD R,D(X,B) */
606                         get_user(*((__u16 *) (opcode+2)), location+1);
607                         signal = math_emu_ld(opcode, regs);
608                         break;
609                 case 0x70: /* STE R,D(X,B) */
610                         get_user(*((__u16 *) (opcode+2)), location+1);
611                         signal = math_emu_ste(opcode, regs);
612                         break;
613                 case 0x78: /* LE R,D(X,B) */
614                         get_user(*((__u16 *) (opcode+2)), location+1);
615                         signal = math_emu_le(opcode, regs);
616                         break;
617                 case 0xb3:
618                         get_user(*((__u16 *) (opcode+2)), location+1);
619                         signal = math_emu_b3(opcode, regs);
620                         break;
621                 case 0xed:
622                         get_user(*((__u32 *) (opcode+2)),
623                                  (__u32 __user *)(location+1));
624                         signal = math_emu_ed(opcode, regs);
625                         break;
626                 case 0xb2:
627                         if (opcode[1] == 0x99) {
628                                 get_user(*((__u16 *) (opcode+2)), location+1);
629                                 signal = math_emu_srnm(opcode, regs);
630                         } else if (opcode[1] == 0x9c) {
631                                 get_user(*((__u16 *) (opcode+2)), location+1);
632                                 signal = math_emu_stfpc(opcode, regs);
633                         } else if (opcode[1] == 0x9d) {
634                                 get_user(*((__u16 *) (opcode+2)), location+1);
635                                 signal = math_emu_lfpc(opcode, regs);
636                         } else
637                                 signal = SIGILL;
638                         break;
639                 default:
640                         signal = SIGILL;
641                         break;
642                 }
643         }
644 #endif 
645         if (current->thread.fp_regs.fpc & FPC_DXC_MASK)
646                 signal = SIGFPE;
647         else
648                 signal = SIGILL;
649         if (signal == SIGFPE)
650                 do_fp_trap(regs, location,
651                            current->thread.fp_regs.fpc, interruption_code);
652         else if (signal) {
653                 siginfo_t info;
654                 info.si_signo = signal;
655                 info.si_errno = 0;
656                 info.si_code = ILL_ILLOPN;
657                 info.si_addr = location;
658                 do_trap(interruption_code, signal, 
659                         "data exception", regs, &info);
660         }
661 }
662
663 static void space_switch_exception(struct pt_regs * regs, long int_code)
664 {
665         siginfo_t info;
666
667         /* Set user psw back to home space mode. */
668         if (regs->psw.mask & PSW_MASK_PSTATE)
669                 regs->psw.mask |= PSW_ASC_HOME;
670         /* Send SIGILL. */
671         info.si_signo = SIGILL;
672         info.si_errno = 0;
673         info.si_code = ILL_PRVOPC;
674         info.si_addr = get_check_address(regs);
675         do_trap(int_code, SIGILL, "space switch event", regs, &info);
676 }
677
678 asmlinkage void kernel_stack_overflow(struct pt_regs * regs)
679 {
680         bust_spinlocks(1);
681         printk("Kernel stack overflow.\n");
682         show_regs(regs);
683         bust_spinlocks(0);
684         panic("Corrupt kernel stack, can't continue.");
685 }
686
687 /* init is done in lowcore.S and head.S */
688
689 void __init trap_init(void)
690 {
691         int i;
692
693         for (i = 0; i < 128; i++)
694           pgm_check_table[i] = &default_trap_handler;
695         pgm_check_table[1] = &illegal_op;
696         pgm_check_table[2] = &privileged_op;
697         pgm_check_table[3] = &execute_exception;
698         pgm_check_table[4] = &do_protection_exception;
699         pgm_check_table[5] = &addressing_exception;
700         pgm_check_table[6] = &specification_exception;
701         pgm_check_table[7] = &data_exception;
702         pgm_check_table[8] = &overflow_exception;
703         pgm_check_table[9] = &divide_exception;
704         pgm_check_table[0x0A] = &overflow_exception;
705         pgm_check_table[0x0B] = &divide_exception;
706         pgm_check_table[0x0C] = &hfp_overflow_exception;
707         pgm_check_table[0x0D] = &hfp_underflow_exception;
708         pgm_check_table[0x0E] = &hfp_significance_exception;
709         pgm_check_table[0x0F] = &hfp_divide_exception;
710         pgm_check_table[0x10] = &do_dat_exception;
711         pgm_check_table[0x11] = &do_dat_exception;
712         pgm_check_table[0x12] = &translation_exception;
713         pgm_check_table[0x13] = &special_op_exception;
714 #ifdef CONFIG_64BIT
715         pgm_check_table[0x38] = &do_dat_exception;
716         pgm_check_table[0x39] = &do_dat_exception;
717         pgm_check_table[0x3A] = &do_dat_exception;
718         pgm_check_table[0x3B] = &do_dat_exception;
719 #endif /* CONFIG_64BIT */
720         pgm_check_table[0x15] = &operand_exception;
721         pgm_check_table[0x1C] = &space_switch_exception;
722         pgm_check_table[0x1D] = &hfp_sqrt_exception;
723         pgm_check_table[0x40] = &do_monitor_call;
724         pfault_irq_init();
725 }