81e03b9c384116553c168052283e50d3237e1e17
[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         spin_unlock_irq(&die_lock);
266         if (in_interrupt())
267                 panic("Fatal exception in interrupt");
268         if (panic_on_oops)
269                 panic("Fatal exception: panic_on_oops");
270         oops_exit();
271         do_exit(SIGSEGV);
272 }
273
274 static void inline
275 report_user_fault(long interruption_code, struct pt_regs *regs)
276 {
277 #if defined(CONFIG_SYSCTL)
278         if (!sysctl_userprocess_debug)
279                 return;
280 #endif
281 #if defined(CONFIG_SYSCTL) || defined(CONFIG_PROCESS_DEBUG)
282         printk("User process fault: interruption code 0x%lX\n",
283                interruption_code);
284         show_regs(regs);
285 #endif
286 }
287
288 int is_valid_bugaddr(unsigned long addr)
289 {
290         return 1;
291 }
292
293 static void __kprobes inline do_trap(long interruption_code, int signr,
294                                         char *str, struct pt_regs *regs,
295                                         siginfo_t *info)
296 {
297         /*
298          * We got all needed information from the lowcore and can
299          * now safely switch on interrupts.
300          */
301         if (regs->psw.mask & PSW_MASK_PSTATE)
302                 local_irq_enable();
303
304         if (notify_die(DIE_TRAP, str, regs, interruption_code,
305                                 interruption_code, signr) == NOTIFY_STOP)
306                 return;
307
308         if (regs->psw.mask & PSW_MASK_PSTATE) {
309                 struct task_struct *tsk = current;
310
311                 tsk->thread.trap_no = interruption_code & 0xffff;
312                 force_sig_info(signr, info, tsk);
313                 report_user_fault(interruption_code, regs);
314         } else {
315                 const struct exception_table_entry *fixup;
316                 fixup = search_exception_tables(regs->psw.addr & PSW_ADDR_INSN);
317                 if (fixup)
318                         regs->psw.addr = fixup->fixup | PSW_ADDR_AMODE;
319                 else {
320                         enum bug_trap_type btt;
321
322                         btt = report_bug(regs->psw.addr & PSW_ADDR_INSN, regs);
323                         if (btt == BUG_TRAP_TYPE_WARN)
324                                 return;
325                         die(str, regs, interruption_code);
326                 }
327         }
328 }
329
330 static inline void __user *get_check_address(struct pt_regs *regs)
331 {
332         return (void __user *)((regs->psw.addr-S390_lowcore.pgm_ilc) & PSW_ADDR_INSN);
333 }
334
335 void __kprobes do_single_step(struct pt_regs *regs)
336 {
337         if (notify_die(DIE_SSTEP, "sstep", regs, 0, 0,
338                                         SIGTRAP) == NOTIFY_STOP){
339                 return;
340         }
341         if ((current->ptrace & PT_PTRACED) != 0)
342                 force_sig(SIGTRAP, current);
343 }
344
345 static void default_trap_handler(struct pt_regs * regs, long interruption_code)
346 {
347         if (regs->psw.mask & PSW_MASK_PSTATE) {
348                 local_irq_enable();
349                 do_exit(SIGSEGV);
350                 report_user_fault(interruption_code, regs);
351         } else
352                 die("Unknown program exception", regs, interruption_code);
353 }
354
355 #define DO_ERROR_INFO(signr, str, name, sicode, siaddr) \
356 static void name(struct pt_regs * regs, long interruption_code) \
357 { \
358         siginfo_t info; \
359         info.si_signo = signr; \
360         info.si_errno = 0; \
361         info.si_code = sicode; \
362         info.si_addr = siaddr; \
363         do_trap(interruption_code, signr, str, regs, &info); \
364 }
365
366 DO_ERROR_INFO(SIGILL, "addressing exception", addressing_exception,
367               ILL_ILLADR, get_check_address(regs))
368 DO_ERROR_INFO(SIGILL,  "execute exception", execute_exception,
369               ILL_ILLOPN, get_check_address(regs))
370 DO_ERROR_INFO(SIGFPE,  "fixpoint divide exception", divide_exception,
371               FPE_INTDIV, get_check_address(regs))
372 DO_ERROR_INFO(SIGFPE,  "fixpoint overflow exception", overflow_exception,
373               FPE_INTOVF, get_check_address(regs))
374 DO_ERROR_INFO(SIGFPE,  "HFP overflow exception", hfp_overflow_exception,
375               FPE_FLTOVF, get_check_address(regs))
376 DO_ERROR_INFO(SIGFPE,  "HFP underflow exception", hfp_underflow_exception,
377               FPE_FLTUND, get_check_address(regs))
378 DO_ERROR_INFO(SIGFPE,  "HFP significance exception", hfp_significance_exception,
379               FPE_FLTRES, get_check_address(regs))
380 DO_ERROR_INFO(SIGFPE,  "HFP divide exception", hfp_divide_exception,
381               FPE_FLTDIV, get_check_address(regs))
382 DO_ERROR_INFO(SIGFPE,  "HFP square root exception", hfp_sqrt_exception,
383               FPE_FLTINV, get_check_address(regs))
384 DO_ERROR_INFO(SIGILL,  "operand exception", operand_exception,
385               ILL_ILLOPN, get_check_address(regs))
386 DO_ERROR_INFO(SIGILL,  "privileged operation", privileged_op,
387               ILL_PRVOPC, get_check_address(regs))
388 DO_ERROR_INFO(SIGILL,  "special operation exception", special_op_exception,
389               ILL_ILLOPN, get_check_address(regs))
390 DO_ERROR_INFO(SIGILL,  "translation exception", translation_exception,
391               ILL_ILLOPN, get_check_address(regs))
392
393 static inline void
394 do_fp_trap(struct pt_regs *regs, void __user *location,
395            int fpc, long interruption_code)
396 {
397         siginfo_t si;
398
399         si.si_signo = SIGFPE;
400         si.si_errno = 0;
401         si.si_addr = location;
402         si.si_code = 0;
403         /* FPC[2] is Data Exception Code */
404         if ((fpc & 0x00000300) == 0) {
405                 /* bits 6 and 7 of DXC are 0 iff IEEE exception */
406                 if (fpc & 0x8000) /* invalid fp operation */
407                         si.si_code = FPE_FLTINV;
408                 else if (fpc & 0x4000) /* div by 0 */
409                         si.si_code = FPE_FLTDIV;
410                 else if (fpc & 0x2000) /* overflow */
411                         si.si_code = FPE_FLTOVF;
412                 else if (fpc & 0x1000) /* underflow */
413                         si.si_code = FPE_FLTUND;
414                 else if (fpc & 0x0800) /* inexact */
415                         si.si_code = FPE_FLTRES;
416         }
417         current->thread.ieee_instruction_pointer = (addr_t) location;
418         do_trap(interruption_code, SIGFPE,
419                 "floating point exception", regs, &si);
420 }
421
422 static void illegal_op(struct pt_regs * regs, long interruption_code)
423 {
424         siginfo_t info;
425         __u8 opcode[6];
426         __u16 __user *location;
427         int signal = 0;
428
429         location = get_check_address(regs);
430
431         /*
432          * We got all needed information from the lowcore and can
433          * now safely switch on interrupts.
434          */
435         if (regs->psw.mask & PSW_MASK_PSTATE)
436                 local_irq_enable();
437
438         if (regs->psw.mask & PSW_MASK_PSTATE) {
439                 if (get_user(*((__u16 *) opcode), (__u16 __user *) location))
440                         return;
441                 if (*((__u16 *) opcode) == S390_BREAKPOINT_U16) {
442                         if (current->ptrace & PT_PTRACED)
443                                 force_sig(SIGTRAP, current);
444                         else
445                                 signal = SIGILL;
446 #ifdef CONFIG_MATHEMU
447                 } else if (opcode[0] == 0xb3) {
448                         if (get_user(*((__u16 *) (opcode+2)), location+1))
449                                 return;
450                         signal = math_emu_b3(opcode, regs);
451                 } else if (opcode[0] == 0xed) {
452                         if (get_user(*((__u32 *) (opcode+2)),
453                                      (__u32 __user *)(location+1)))
454                                 return;
455                         signal = math_emu_ed(opcode, regs);
456                 } else if (*((__u16 *) opcode) == 0xb299) {
457                         if (get_user(*((__u16 *) (opcode+2)), location+1))
458                                 return;
459                         signal = math_emu_srnm(opcode, regs);
460                 } else if (*((__u16 *) opcode) == 0xb29c) {
461                         if (get_user(*((__u16 *) (opcode+2)), location+1))
462                                 return;
463                         signal = math_emu_stfpc(opcode, regs);
464                 } else if (*((__u16 *) opcode) == 0xb29d) {
465                         if (get_user(*((__u16 *) (opcode+2)), location+1))
466                                 return;
467                         signal = math_emu_lfpc(opcode, regs);
468 #endif
469                 } else
470                         signal = SIGILL;
471         } else {
472                 /*
473                  * If we get an illegal op in kernel mode, send it through the
474                  * kprobes notifier. If kprobes doesn't pick it up, SIGILL
475                  */
476                 if (notify_die(DIE_BPT, "bpt", regs, interruption_code,
477                                3, SIGTRAP) != NOTIFY_STOP)
478                         signal = SIGILL;
479         }
480
481 #ifdef CONFIG_MATHEMU
482         if (signal == SIGFPE)
483                 do_fp_trap(regs, location,
484                            current->thread.fp_regs.fpc, interruption_code);
485         else if (signal == SIGSEGV) {
486                 info.si_signo = signal;
487                 info.si_errno = 0;
488                 info.si_code = SEGV_MAPERR;
489                 info.si_addr = (void __user *) location;
490                 do_trap(interruption_code, signal,
491                         "user address fault", regs, &info);
492         } else
493 #endif
494         if (signal) {
495                 info.si_signo = signal;
496                 info.si_errno = 0;
497                 info.si_code = ILL_ILLOPC;
498                 info.si_addr = (void __user *) location;
499                 do_trap(interruption_code, signal,
500                         "illegal operation", regs, &info);
501         }
502 }
503
504
505 #ifdef CONFIG_MATHEMU
506 asmlinkage void 
507 specification_exception(struct pt_regs * regs, long interruption_code)
508 {
509         __u8 opcode[6];
510         __u16 __user *location = NULL;
511         int signal = 0;
512
513         location = (__u16 __user *) get_check_address(regs);
514
515         /*
516          * We got all needed information from the lowcore and can
517          * now safely switch on interrupts.
518          */
519         if (regs->psw.mask & PSW_MASK_PSTATE)
520                 local_irq_enable();
521
522         if (regs->psw.mask & PSW_MASK_PSTATE) {
523                 get_user(*((__u16 *) opcode), location);
524                 switch (opcode[0]) {
525                 case 0x28: /* LDR Rx,Ry   */
526                         signal = math_emu_ldr(opcode);
527                         break;
528                 case 0x38: /* LER Rx,Ry   */
529                         signal = math_emu_ler(opcode);
530                         break;
531                 case 0x60: /* STD R,D(X,B) */
532                         get_user(*((__u16 *) (opcode+2)), location+1);
533                         signal = math_emu_std(opcode, regs);
534                         break;
535                 case 0x68: /* LD R,D(X,B) */
536                         get_user(*((__u16 *) (opcode+2)), location+1);
537                         signal = math_emu_ld(opcode, regs);
538                         break;
539                 case 0x70: /* STE R,D(X,B) */
540                         get_user(*((__u16 *) (opcode+2)), location+1);
541                         signal = math_emu_ste(opcode, regs);
542                         break;
543                 case 0x78: /* LE R,D(X,B) */
544                         get_user(*((__u16 *) (opcode+2)), location+1);
545                         signal = math_emu_le(opcode, regs);
546                         break;
547                 default:
548                         signal = SIGILL;
549                         break;
550                 }
551         } else
552                 signal = SIGILL;
553
554         if (signal == SIGFPE)
555                 do_fp_trap(regs, location,
556                            current->thread.fp_regs.fpc, interruption_code);
557         else if (signal) {
558                 siginfo_t info;
559                 info.si_signo = signal;
560                 info.si_errno = 0;
561                 info.si_code = ILL_ILLOPN;
562                 info.si_addr = location;
563                 do_trap(interruption_code, signal, 
564                         "specification exception", regs, &info);
565         }
566 }
567 #else
568 DO_ERROR_INFO(SIGILL, "specification exception", specification_exception,
569               ILL_ILLOPN, get_check_address(regs));
570 #endif
571
572 static void data_exception(struct pt_regs * regs, long interruption_code)
573 {
574         __u16 __user *location;
575         int signal = 0;
576
577         location = get_check_address(regs);
578
579         /*
580          * We got all needed information from the lowcore and can
581          * now safely switch on interrupts.
582          */
583         if (regs->psw.mask & PSW_MASK_PSTATE)
584                 local_irq_enable();
585
586         if (MACHINE_HAS_IEEE)
587                 asm volatile("stfpc %0" : "=m" (current->thread.fp_regs.fpc));
588
589 #ifdef CONFIG_MATHEMU
590         else if (regs->psw.mask & PSW_MASK_PSTATE) {
591                 __u8 opcode[6];
592                 get_user(*((__u16 *) opcode), location);
593                 switch (opcode[0]) {
594                 case 0x28: /* LDR Rx,Ry   */
595                         signal = math_emu_ldr(opcode);
596                         break;
597                 case 0x38: /* LER Rx,Ry   */
598                         signal = math_emu_ler(opcode);
599                         break;
600                 case 0x60: /* STD R,D(X,B) */
601                         get_user(*((__u16 *) (opcode+2)), location+1);
602                         signal = math_emu_std(opcode, regs);
603                         break;
604                 case 0x68: /* LD R,D(X,B) */
605                         get_user(*((__u16 *) (opcode+2)), location+1);
606                         signal = math_emu_ld(opcode, regs);
607                         break;
608                 case 0x70: /* STE R,D(X,B) */
609                         get_user(*((__u16 *) (opcode+2)), location+1);
610                         signal = math_emu_ste(opcode, regs);
611                         break;
612                 case 0x78: /* LE R,D(X,B) */
613                         get_user(*((__u16 *) (opcode+2)), location+1);
614                         signal = math_emu_le(opcode, regs);
615                         break;
616                 case 0xb3:
617                         get_user(*((__u16 *) (opcode+2)), location+1);
618                         signal = math_emu_b3(opcode, regs);
619                         break;
620                 case 0xed:
621                         get_user(*((__u32 *) (opcode+2)),
622                                  (__u32 __user *)(location+1));
623                         signal = math_emu_ed(opcode, regs);
624                         break;
625                 case 0xb2:
626                         if (opcode[1] == 0x99) {
627                                 get_user(*((__u16 *) (opcode+2)), location+1);
628                                 signal = math_emu_srnm(opcode, regs);
629                         } else if (opcode[1] == 0x9c) {
630                                 get_user(*((__u16 *) (opcode+2)), location+1);
631                                 signal = math_emu_stfpc(opcode, regs);
632                         } else if (opcode[1] == 0x9d) {
633                                 get_user(*((__u16 *) (opcode+2)), location+1);
634                                 signal = math_emu_lfpc(opcode, regs);
635                         } else
636                                 signal = SIGILL;
637                         break;
638                 default:
639                         signal = SIGILL;
640                         break;
641                 }
642         }
643 #endif 
644         if (current->thread.fp_regs.fpc & FPC_DXC_MASK)
645                 signal = SIGFPE;
646         else
647                 signal = SIGILL;
648         if (signal == SIGFPE)
649                 do_fp_trap(regs, location,
650                            current->thread.fp_regs.fpc, interruption_code);
651         else if (signal) {
652                 siginfo_t info;
653                 info.si_signo = signal;
654                 info.si_errno = 0;
655                 info.si_code = ILL_ILLOPN;
656                 info.si_addr = location;
657                 do_trap(interruption_code, signal, 
658                         "data exception", regs, &info);
659         }
660 }
661
662 static void space_switch_exception(struct pt_regs * regs, long int_code)
663 {
664         siginfo_t info;
665
666         /* Set user psw back to home space mode. */
667         if (regs->psw.mask & PSW_MASK_PSTATE)
668                 regs->psw.mask |= PSW_ASC_HOME;
669         /* Send SIGILL. */
670         info.si_signo = SIGILL;
671         info.si_errno = 0;
672         info.si_code = ILL_PRVOPC;
673         info.si_addr = get_check_address(regs);
674         do_trap(int_code, SIGILL, "space switch event", regs, &info);
675 }
676
677 asmlinkage void kernel_stack_overflow(struct pt_regs * regs)
678 {
679         bust_spinlocks(1);
680         printk("Kernel stack overflow.\n");
681         show_regs(regs);
682         bust_spinlocks(0);
683         panic("Corrupt kernel stack, can't continue.");
684 }
685
686 /* init is done in lowcore.S and head.S */
687
688 void __init trap_init(void)
689 {
690         int i;
691
692         for (i = 0; i < 128; i++)
693           pgm_check_table[i] = &default_trap_handler;
694         pgm_check_table[1] = &illegal_op;
695         pgm_check_table[2] = &privileged_op;
696         pgm_check_table[3] = &execute_exception;
697         pgm_check_table[4] = &do_protection_exception;
698         pgm_check_table[5] = &addressing_exception;
699         pgm_check_table[6] = &specification_exception;
700         pgm_check_table[7] = &data_exception;
701         pgm_check_table[8] = &overflow_exception;
702         pgm_check_table[9] = &divide_exception;
703         pgm_check_table[0x0A] = &overflow_exception;
704         pgm_check_table[0x0B] = &divide_exception;
705         pgm_check_table[0x0C] = &hfp_overflow_exception;
706         pgm_check_table[0x0D] = &hfp_underflow_exception;
707         pgm_check_table[0x0E] = &hfp_significance_exception;
708         pgm_check_table[0x0F] = &hfp_divide_exception;
709         pgm_check_table[0x10] = &do_dat_exception;
710         pgm_check_table[0x11] = &do_dat_exception;
711         pgm_check_table[0x12] = &translation_exception;
712         pgm_check_table[0x13] = &special_op_exception;
713 #ifdef CONFIG_64BIT
714         pgm_check_table[0x38] = &do_dat_exception;
715         pgm_check_table[0x39] = &do_dat_exception;
716         pgm_check_table[0x3A] = &do_dat_exception;
717         pgm_check_table[0x3B] = &do_dat_exception;
718 #endif /* CONFIG_64BIT */
719         pgm_check_table[0x15] = &operand_exception;
720         pgm_check_table[0x1C] = &space_switch_exception;
721         pgm_check_table[0x1D] = &hfp_sqrt_exception;
722         pgm_check_table[0x40] = &do_monitor_call;
723         pfault_irq_init();
724 }