2 * arch/s390/kernel/traps.c
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),
9 * Derived from "arch/i386/kernel/traps.c"
10 * Copyright (C) 1991, 1992 Linus Torvalds
14 * 'Traps.c' handles hardware traps and faults after we have saved some
17 #include <linux/sched.h>
18 #include <linux/kernel.h>
19 #include <linux/string.h>
20 #include <linux/errno.h>
21 #include <linux/tracehook.h>
22 #include <linux/timer.h>
24 #include <linux/smp.h>
25 #include <linux/init.h>
26 #include <linux/interrupt.h>
27 #include <linux/seq_file.h>
28 #include <linux/delay.h>
29 #include <linux/module.h>
30 #include <linux/kdebug.h>
31 #include <linux/kallsyms.h>
32 #include <linux/reboot.h>
33 #include <linux/kprobes.h>
34 #include <linux/bug.h>
35 #include <linux/utsname.h>
36 #include <asm/system.h>
37 #include <asm/uaccess.h>
39 #include <asm/atomic.h>
40 #include <asm/mathemu.h>
41 #include <asm/cpcmd.h>
42 #include <asm/s390_ext.h>
43 #include <asm/lowcore.h>
44 #include <asm/debug.h>
47 pgm_check_handler_t
*pgm_check_table
[128];
49 int show_unhandled_signals
;
51 extern pgm_check_handler_t do_protection_exception
;
52 extern pgm_check_handler_t do_dat_exception
;
53 extern pgm_check_handler_t do_asce_exception
;
55 #define stack_pointer ({ void **sp; asm("la %0,0(15)" : "=&d" (sp)); sp; })
59 #define FOURLONG "%08lx %08lx %08lx %08lx\n"
60 static int kstack_depth_to_print
= 12;
61 #else /* CONFIG_64BIT */
62 #define LONG "%016lx "
63 #define FOURLONG "%016lx %016lx %016lx %016lx\n"
64 static int kstack_depth_to_print
= 20;
65 #endif /* CONFIG_64BIT */
68 * For show_trace we have tree different stack to consider:
69 * - the panic stack which is used if the kernel stack has overflown
70 * - the asynchronous interrupt stack (cpu related)
71 * - the synchronous kernel stack (process related)
72 * The stack trace can start at any of the three stack and can potentially
73 * touch all of them. The order is: panic stack, async stack, sync stack.
76 __show_trace(unsigned long sp
, unsigned long low
, unsigned long high
)
78 struct stack_frame
*sf
;
82 sp
= sp
& PSW_ADDR_INSN
;
83 if (sp
< low
|| sp
> high
- sizeof(*sf
))
85 sf
= (struct stack_frame
*) sp
;
86 printk("([<%016lx>] ", sf
->gprs
[8] & PSW_ADDR_INSN
);
87 print_symbol("%s)\n", sf
->gprs
[8] & PSW_ADDR_INSN
);
88 /* Follow the backchain. */
91 sp
= sf
->back_chain
& PSW_ADDR_INSN
;
94 if (sp
<= low
|| sp
> high
- sizeof(*sf
))
96 sf
= (struct stack_frame
*) sp
;
97 printk(" [<%016lx>] ", sf
->gprs
[8] & PSW_ADDR_INSN
);
98 print_symbol("%s\n", sf
->gprs
[8] & PSW_ADDR_INSN
);
100 /* Zero backchain detected, check for interrupt frame. */
101 sp
= (unsigned long) (sf
+ 1);
102 if (sp
<= low
|| sp
> high
- sizeof(*regs
))
104 regs
= (struct pt_regs
*) sp
;
105 printk(" [<%016lx>] ", regs
->psw
.addr
& PSW_ADDR_INSN
);
106 print_symbol("%s\n", regs
->psw
.addr
& PSW_ADDR_INSN
);
112 static void show_trace(struct task_struct
*task
, unsigned long *stack
)
114 register unsigned long __r15
asm ("15");
117 sp
= (unsigned long) stack
;
119 sp
= task
? task
->thread
.ksp
: __r15
;
120 printk("Call Trace:\n");
121 #ifdef CONFIG_CHECK_STACK
122 sp
= __show_trace(sp
, S390_lowcore
.panic_stack
- 4096,
123 S390_lowcore
.panic_stack
);
125 sp
= __show_trace(sp
, S390_lowcore
.async_stack
- ASYNC_SIZE
,
126 S390_lowcore
.async_stack
);
128 __show_trace(sp
, (unsigned long) task_stack_page(task
),
129 (unsigned long) task_stack_page(task
) + THREAD_SIZE
);
131 __show_trace(sp
, S390_lowcore
.thread_info
,
132 S390_lowcore
.thread_info
+ THREAD_SIZE
);
135 debug_show_held_locks(task
);
138 void show_stack(struct task_struct
*task
, unsigned long *sp
)
140 register unsigned long * __r15
asm ("15");
141 unsigned long *stack
;
145 stack
= task
? (unsigned long *) task
->thread
.ksp
: __r15
;
149 for (i
= 0; i
< kstack_depth_to_print
; i
++) {
150 if (((addr_t
) stack
& (THREAD_SIZE
-1)) == 0)
152 if (i
&& ((i
* sizeof (long) % 32) == 0))
154 printk(LONG
, *stack
++);
157 show_trace(task
, sp
);
160 static void show_last_breaking_event(struct pt_regs
*regs
)
163 printk("Last Breaking-Event-Address:\n");
164 printk(" [<%016lx>] ", regs
->args
[0] & PSW_ADDR_INSN
);
165 print_symbol("%s\n", regs
->args
[0] & PSW_ADDR_INSN
);
170 * The architecture-independent dump_stack generator
172 void dump_stack(void)
174 printk("CPU: %d %s %s %.*s\n",
175 task_thread_info(current
)->cpu
, print_tainted(),
176 init_utsname()->release
,
177 (int)strcspn(init_utsname()->version
, " "),
178 init_utsname()->version
);
179 printk("Process %s (pid: %d, task: %p, ksp: %p)\n",
180 current
->comm
, current
->pid
, current
,
181 (void *) current
->thread
.ksp
);
182 show_stack(NULL
, NULL
);
184 EXPORT_SYMBOL(dump_stack
);
186 static inline int mask_bits(struct pt_regs
*regs
, unsigned long bits
)
188 return (regs
->psw
.mask
& bits
) / ((~bits
+ 1) & bits
);
191 void show_registers(struct pt_regs
*regs
)
195 mode
= (regs
->psw
.mask
& PSW_MASK_PSTATE
) ? "User" : "Krnl";
196 printk("%s PSW : %p %p",
197 mode
, (void *) regs
->psw
.mask
,
198 (void *) regs
->psw
.addr
);
199 print_symbol(" (%s)\n", regs
->psw
.addr
& PSW_ADDR_INSN
);
200 printk(" R:%x T:%x IO:%x EX:%x Key:%x M:%x W:%x "
201 "P:%x AS:%x CC:%x PM:%x", mask_bits(regs
, PSW_MASK_PER
),
202 mask_bits(regs
, PSW_MASK_DAT
), mask_bits(regs
, PSW_MASK_IO
),
203 mask_bits(regs
, PSW_MASK_EXT
), mask_bits(regs
, PSW_MASK_KEY
),
204 mask_bits(regs
, PSW_MASK_MCHECK
), mask_bits(regs
, PSW_MASK_WAIT
),
205 mask_bits(regs
, PSW_MASK_PSTATE
), mask_bits(regs
, PSW_MASK_ASC
),
206 mask_bits(regs
, PSW_MASK_CC
), mask_bits(regs
, PSW_MASK_PM
));
208 printk(" EA:%x", mask_bits(regs
, PSW_BASE_BITS
));
210 printk("\n%s GPRS: " FOURLONG
, mode
,
211 regs
->gprs
[0], regs
->gprs
[1], regs
->gprs
[2], regs
->gprs
[3]);
213 regs
->gprs
[4], regs
->gprs
[5], regs
->gprs
[6], regs
->gprs
[7]);
215 regs
->gprs
[8], regs
->gprs
[9], regs
->gprs
[10], regs
->gprs
[11]);
217 regs
->gprs
[12], regs
->gprs
[13], regs
->gprs
[14], regs
->gprs
[15]);
222 void show_regs(struct pt_regs
*regs
)
225 printk("CPU: %d %s %s %.*s\n",
226 task_thread_info(current
)->cpu
, print_tainted(),
227 init_utsname()->release
,
228 (int)strcspn(init_utsname()->version
, " "),
229 init_utsname()->version
);
230 printk("Process %s (pid: %d, task: %p, ksp: %p)\n",
231 current
->comm
, current
->pid
, current
,
232 (void *) current
->thread
.ksp
);
233 show_registers(regs
);
234 /* Show stack backtrace if pt_regs is from kernel mode */
235 if (!(regs
->psw
.mask
& PSW_MASK_PSTATE
))
236 show_trace(NULL
, (unsigned long *) regs
->gprs
[15]);
237 show_last_breaking_event(regs
);
240 /* This is called from fs/proc/array.c */
241 void task_show_regs(struct seq_file
*m
, struct task_struct
*task
)
243 struct pt_regs
*regs
;
245 regs
= task_pt_regs(task
);
246 seq_printf(m
, "task: %p, ksp: %p\n",
247 task
, (void *)task
->thread
.ksp
);
248 seq_printf(m
, "User PSW : %p %p\n",
249 (void *) regs
->psw
.mask
, (void *)regs
->psw
.addr
);
251 seq_printf(m
, "User GPRS: " FOURLONG
,
252 regs
->gprs
[0], regs
->gprs
[1],
253 regs
->gprs
[2], regs
->gprs
[3]);
254 seq_printf(m
, " " FOURLONG
,
255 regs
->gprs
[4], regs
->gprs
[5],
256 regs
->gprs
[6], regs
->gprs
[7]);
257 seq_printf(m
, " " FOURLONG
,
258 regs
->gprs
[8], regs
->gprs
[9],
259 regs
->gprs
[10], regs
->gprs
[11]);
260 seq_printf(m
, " " FOURLONG
,
261 regs
->gprs
[12], regs
->gprs
[13],
262 regs
->gprs
[14], regs
->gprs
[15]);
263 seq_printf(m
, "User ACRS: %08x %08x %08x %08x\n",
264 task
->thread
.acrs
[0], task
->thread
.acrs
[1],
265 task
->thread
.acrs
[2], task
->thread
.acrs
[3]);
266 seq_printf(m
, " %08x %08x %08x %08x\n",
267 task
->thread
.acrs
[4], task
->thread
.acrs
[5],
268 task
->thread
.acrs
[6], task
->thread
.acrs
[7]);
269 seq_printf(m
, " %08x %08x %08x %08x\n",
270 task
->thread
.acrs
[8], task
->thread
.acrs
[9],
271 task
->thread
.acrs
[10], task
->thread
.acrs
[11]);
272 seq_printf(m
, " %08x %08x %08x %08x\n",
273 task
->thread
.acrs
[12], task
->thread
.acrs
[13],
274 task
->thread
.acrs
[14], task
->thread
.acrs
[15]);
277 static DEFINE_SPINLOCK(die_lock
);
279 void die(const char * str
, struct pt_regs
* regs
, long err
)
281 static int die_counter
;
286 spin_lock_irq(&die_lock
);
288 printk("%s: %04lx [#%d] ", str
, err
& 0xffff, ++die_counter
);
289 #ifdef CONFIG_PREEMPT
295 #ifdef CONFIG_DEBUG_PAGEALLOC
296 printk("DEBUG_PAGEALLOC");
299 notify_die(DIE_OOPS
, str
, regs
, err
, current
->thread
.trap_no
, SIGSEGV
);
302 add_taint(TAINT_DIE
);
303 spin_unlock_irq(&die_lock
);
305 panic("Fatal exception in interrupt");
307 panic("Fatal exception: panic_on_oops");
312 static void inline report_user_fault(struct pt_regs
*regs
, long int_code
,
315 if ((task_pid_nr(current
) > 1) && !show_unhandled_signals
)
317 if (!unhandled_signal(current
, signr
))
319 if (!printk_ratelimit())
321 printk("User process fault: interruption code 0x%lX ", int_code
);
322 print_vma_addr("in ", regs
->psw
.addr
& PSW_ADDR_INSN
);
327 int is_valid_bugaddr(unsigned long addr
)
332 static inline void __kprobes
do_trap(long pgm_int_code
, int signr
, char *str
,
333 struct pt_regs
*regs
, siginfo_t
*info
)
335 if (notify_die(DIE_TRAP
, str
, regs
, pgm_int_code
,
336 pgm_int_code
, signr
) == NOTIFY_STOP
)
339 if (regs
->psw
.mask
& PSW_MASK_PSTATE
) {
340 struct task_struct
*tsk
= current
;
342 tsk
->thread
.trap_no
= pgm_int_code
& 0xffff;
343 force_sig_info(signr
, info
, tsk
);
344 report_user_fault(regs
, pgm_int_code
, signr
);
346 const struct exception_table_entry
*fixup
;
347 fixup
= search_exception_tables(regs
->psw
.addr
& PSW_ADDR_INSN
);
349 regs
->psw
.addr
= fixup
->fixup
| PSW_ADDR_AMODE
;
351 enum bug_trap_type btt
;
353 btt
= report_bug(regs
->psw
.addr
& PSW_ADDR_INSN
, regs
);
354 if (btt
== BUG_TRAP_TYPE_WARN
)
356 die(str
, regs
, pgm_int_code
);
361 static inline void __user
*get_psw_address(struct pt_regs
*regs
,
364 return (void __user
*)
365 ((regs
->psw
.addr
- (pgm_int_code
>> 16)) & PSW_ADDR_INSN
);
368 void __kprobes
do_per_trap(struct pt_regs
*regs
)
370 if (notify_die(DIE_SSTEP
, "sstep", regs
, 0, 0, SIGTRAP
) == NOTIFY_STOP
)
372 if (tracehook_consider_fatal_signal(current
, SIGTRAP
))
373 force_sig(SIGTRAP
, current
);
376 static void default_trap_handler(struct pt_regs
*regs
, long pgm_int_code
,
377 unsigned long trans_exc_code
)
379 if (regs
->psw
.mask
& PSW_MASK_PSTATE
) {
380 report_user_fault(regs
, pgm_int_code
, SIGSEGV
);
383 die("Unknown program exception", regs
, pgm_int_code
);
386 #define DO_ERROR_INFO(name, signr, sicode, str) \
387 static void name(struct pt_regs *regs, long pgm_int_code, \
388 unsigned long trans_exc_code) \
391 info.si_signo = signr; \
393 info.si_code = sicode; \
394 info.si_addr = get_psw_address(regs, pgm_int_code); \
395 do_trap(pgm_int_code, signr, str, regs, &info); \
398 DO_ERROR_INFO(addressing_exception
, SIGILL
, ILL_ILLADR
,
399 "addressing exception")
400 DO_ERROR_INFO(execute_exception
, SIGILL
, ILL_ILLOPN
,
402 DO_ERROR_INFO(divide_exception
, SIGFPE
, FPE_INTDIV
,
403 "fixpoint divide exception")
404 DO_ERROR_INFO(overflow_exception
, SIGFPE
, FPE_INTOVF
,
405 "fixpoint overflow exception")
406 DO_ERROR_INFO(hfp_overflow_exception
, SIGFPE
, FPE_FLTOVF
,
407 "HFP overflow exception")
408 DO_ERROR_INFO(hfp_underflow_exception
, SIGFPE
, FPE_FLTUND
,
409 "HFP underflow exception")
410 DO_ERROR_INFO(hfp_significance_exception
, SIGFPE
, FPE_FLTRES
,
411 "HFP significance exception")
412 DO_ERROR_INFO(hfp_divide_exception
, SIGFPE
, FPE_FLTDIV
,
413 "HFP divide exception")
414 DO_ERROR_INFO(hfp_sqrt_exception
, SIGFPE
, FPE_FLTINV
,
415 "HFP square root exception")
416 DO_ERROR_INFO(operand_exception
, SIGILL
, ILL_ILLOPN
,
418 DO_ERROR_INFO(privileged_op
, SIGILL
, ILL_PRVOPC
,
419 "privileged operation")
420 DO_ERROR_INFO(special_op_exception
, SIGILL
, ILL_ILLOPN
,
421 "special operation exception")
422 DO_ERROR_INFO(translation_exception
, SIGILL
, ILL_ILLOPN
,
423 "translation exception")
425 static inline void do_fp_trap(struct pt_regs
*regs
, void __user
*location
,
426 int fpc
, long pgm_int_code
)
430 si
.si_signo
= SIGFPE
;
432 si
.si_addr
= location
;
434 /* FPC[2] is Data Exception Code */
435 if ((fpc
& 0x00000300) == 0) {
436 /* bits 6 and 7 of DXC are 0 iff IEEE exception */
437 if (fpc
& 0x8000) /* invalid fp operation */
438 si
.si_code
= FPE_FLTINV
;
439 else if (fpc
& 0x4000) /* div by 0 */
440 si
.si_code
= FPE_FLTDIV
;
441 else if (fpc
& 0x2000) /* overflow */
442 si
.si_code
= FPE_FLTOVF
;
443 else if (fpc
& 0x1000) /* underflow */
444 si
.si_code
= FPE_FLTUND
;
445 else if (fpc
& 0x0800) /* inexact */
446 si
.si_code
= FPE_FLTRES
;
448 do_trap(pgm_int_code
, SIGFPE
,
449 "floating point exception", regs
, &si
);
452 static void __kprobes
illegal_op(struct pt_regs
*regs
, long pgm_int_code
,
453 unsigned long trans_exc_code
)
457 __u16 __user
*location
;
460 location
= get_psw_address(regs
, pgm_int_code
);
462 if (regs
->psw
.mask
& PSW_MASK_PSTATE
) {
463 if (get_user(*((__u16
*) opcode
), (__u16 __user
*) location
))
465 if (*((__u16
*) opcode
) == S390_BREAKPOINT_U16
) {
466 if (tracehook_consider_fatal_signal(current
, SIGTRAP
))
467 force_sig(SIGTRAP
, current
);
470 #ifdef CONFIG_MATHEMU
471 } else if (opcode
[0] == 0xb3) {
472 if (get_user(*((__u16
*) (opcode
+2)), location
+1))
474 signal
= math_emu_b3(opcode
, regs
);
475 } else if (opcode
[0] == 0xed) {
476 if (get_user(*((__u32
*) (opcode
+2)),
477 (__u32 __user
*)(location
+1)))
479 signal
= math_emu_ed(opcode
, regs
);
480 } else if (*((__u16
*) opcode
) == 0xb299) {
481 if (get_user(*((__u16
*) (opcode
+2)), location
+1))
483 signal
= math_emu_srnm(opcode
, regs
);
484 } else if (*((__u16
*) opcode
) == 0xb29c) {
485 if (get_user(*((__u16
*) (opcode
+2)), location
+1))
487 signal
= math_emu_stfpc(opcode
, regs
);
488 } else if (*((__u16
*) opcode
) == 0xb29d) {
489 if (get_user(*((__u16
*) (opcode
+2)), location
+1))
491 signal
= math_emu_lfpc(opcode
, regs
);
497 * If we get an illegal op in kernel mode, send it through the
498 * kprobes notifier. If kprobes doesn't pick it up, SIGILL
500 if (notify_die(DIE_BPT
, "bpt", regs
, pgm_int_code
,
501 3, SIGTRAP
) != NOTIFY_STOP
)
505 #ifdef CONFIG_MATHEMU
506 if (signal
== SIGFPE
)
507 do_fp_trap(regs
, location
,
508 current
->thread
.fp_regs
.fpc
, pgm_int_code
);
509 else if (signal
== SIGSEGV
) {
510 info
.si_signo
= signal
;
512 info
.si_code
= SEGV_MAPERR
;
513 info
.si_addr
= (void __user
*) location
;
514 do_trap(pgm_int_code
, signal
,
515 "user address fault", regs
, &info
);
519 info
.si_signo
= signal
;
521 info
.si_code
= ILL_ILLOPC
;
522 info
.si_addr
= (void __user
*) location
;
523 do_trap(pgm_int_code
, signal
,
524 "illegal operation", regs
, &info
);
529 #ifdef CONFIG_MATHEMU
530 asmlinkage
void specification_exception(struct pt_regs
*regs
,
532 unsigned long trans_exc_code
)
535 __u16 __user
*location
= NULL
;
538 location
= (__u16 __user
*) get_psw_address(regs
, pgm_int_code
);
540 if (regs
->psw
.mask
& PSW_MASK_PSTATE
) {
541 get_user(*((__u16
*) opcode
), location
);
543 case 0x28: /* LDR Rx,Ry */
544 signal
= math_emu_ldr(opcode
);
546 case 0x38: /* LER Rx,Ry */
547 signal
= math_emu_ler(opcode
);
549 case 0x60: /* STD R,D(X,B) */
550 get_user(*((__u16
*) (opcode
+2)), location
+1);
551 signal
= math_emu_std(opcode
, regs
);
553 case 0x68: /* LD R,D(X,B) */
554 get_user(*((__u16
*) (opcode
+2)), location
+1);
555 signal
= math_emu_ld(opcode
, regs
);
557 case 0x70: /* STE R,D(X,B) */
558 get_user(*((__u16
*) (opcode
+2)), location
+1);
559 signal
= math_emu_ste(opcode
, regs
);
561 case 0x78: /* LE R,D(X,B) */
562 get_user(*((__u16
*) (opcode
+2)), location
+1);
563 signal
= math_emu_le(opcode
, regs
);
572 if (signal
== SIGFPE
)
573 do_fp_trap(regs
, location
,
574 current
->thread
.fp_regs
.fpc
, pgm_int_code
);
577 info
.si_signo
= signal
;
579 info
.si_code
= ILL_ILLOPN
;
580 info
.si_addr
= location
;
581 do_trap(pgm_int_code
, signal
,
582 "specification exception", regs
, &info
);
586 DO_ERROR_INFO(specification_exception
, SIGILL
, ILL_ILLOPN
,
587 "specification exception");
590 static void data_exception(struct pt_regs
*regs
, long pgm_int_code
,
591 unsigned long trans_exc_code
)
593 __u16 __user
*location
;
596 location
= get_psw_address(regs
, pgm_int_code
);
598 if (MACHINE_HAS_IEEE
)
599 asm volatile("stfpc %0" : "=m" (current
->thread
.fp_regs
.fpc
));
601 #ifdef CONFIG_MATHEMU
602 else if (regs
->psw
.mask
& PSW_MASK_PSTATE
) {
604 get_user(*((__u16
*) opcode
), location
);
606 case 0x28: /* LDR Rx,Ry */
607 signal
= math_emu_ldr(opcode
);
609 case 0x38: /* LER Rx,Ry */
610 signal
= math_emu_ler(opcode
);
612 case 0x60: /* STD R,D(X,B) */
613 get_user(*((__u16
*) (opcode
+2)), location
+1);
614 signal
= math_emu_std(opcode
, regs
);
616 case 0x68: /* LD R,D(X,B) */
617 get_user(*((__u16
*) (opcode
+2)), location
+1);
618 signal
= math_emu_ld(opcode
, regs
);
620 case 0x70: /* STE R,D(X,B) */
621 get_user(*((__u16
*) (opcode
+2)), location
+1);
622 signal
= math_emu_ste(opcode
, regs
);
624 case 0x78: /* LE R,D(X,B) */
625 get_user(*((__u16
*) (opcode
+2)), location
+1);
626 signal
= math_emu_le(opcode
, regs
);
629 get_user(*((__u16
*) (opcode
+2)), location
+1);
630 signal
= math_emu_b3(opcode
, regs
);
633 get_user(*((__u32
*) (opcode
+2)),
634 (__u32 __user
*)(location
+1));
635 signal
= math_emu_ed(opcode
, regs
);
638 if (opcode
[1] == 0x99) {
639 get_user(*((__u16
*) (opcode
+2)), location
+1);
640 signal
= math_emu_srnm(opcode
, regs
);
641 } else if (opcode
[1] == 0x9c) {
642 get_user(*((__u16
*) (opcode
+2)), location
+1);
643 signal
= math_emu_stfpc(opcode
, regs
);
644 } else if (opcode
[1] == 0x9d) {
645 get_user(*((__u16
*) (opcode
+2)), location
+1);
646 signal
= math_emu_lfpc(opcode
, regs
);
656 if (current
->thread
.fp_regs
.fpc
& FPC_DXC_MASK
)
660 if (signal
== SIGFPE
)
661 do_fp_trap(regs
, location
,
662 current
->thread
.fp_regs
.fpc
, pgm_int_code
);
665 info
.si_signo
= signal
;
667 info
.si_code
= ILL_ILLOPN
;
668 info
.si_addr
= location
;
669 do_trap(pgm_int_code
, signal
, "data exception", regs
, &info
);
673 static void space_switch_exception(struct pt_regs
*regs
, long pgm_int_code
,
674 unsigned long trans_exc_code
)
678 /* Set user psw back to home space mode. */
679 if (regs
->psw
.mask
& PSW_MASK_PSTATE
)
680 regs
->psw
.mask
|= PSW_ASC_HOME
;
682 info
.si_signo
= SIGILL
;
684 info
.si_code
= ILL_PRVOPC
;
685 info
.si_addr
= get_psw_address(regs
, pgm_int_code
);
686 do_trap(pgm_int_code
, SIGILL
, "space switch event", regs
, &info
);
689 asmlinkage
void __kprobes
kernel_stack_overflow(struct pt_regs
* regs
)
692 printk("Kernel stack overflow.\n");
695 panic("Corrupt kernel stack, can't continue.");
698 /* init is done in lowcore.S and head.S */
700 void __init
trap_init(void)
704 for (i
= 0; i
< 128; i
++)
705 pgm_check_table
[i
] = &default_trap_handler
;
706 pgm_check_table
[1] = &illegal_op
;
707 pgm_check_table
[2] = &privileged_op
;
708 pgm_check_table
[3] = &execute_exception
;
709 pgm_check_table
[4] = &do_protection_exception
;
710 pgm_check_table
[5] = &addressing_exception
;
711 pgm_check_table
[6] = &specification_exception
;
712 pgm_check_table
[7] = &data_exception
;
713 pgm_check_table
[8] = &overflow_exception
;
714 pgm_check_table
[9] = ÷_exception
;
715 pgm_check_table
[0x0A] = &overflow_exception
;
716 pgm_check_table
[0x0B] = ÷_exception
;
717 pgm_check_table
[0x0C] = &hfp_overflow_exception
;
718 pgm_check_table
[0x0D] = &hfp_underflow_exception
;
719 pgm_check_table
[0x0E] = &hfp_significance_exception
;
720 pgm_check_table
[0x0F] = &hfp_divide_exception
;
721 pgm_check_table
[0x10] = &do_dat_exception
;
722 pgm_check_table
[0x11] = &do_dat_exception
;
723 pgm_check_table
[0x12] = &translation_exception
;
724 pgm_check_table
[0x13] = &special_op_exception
;
726 pgm_check_table
[0x38] = &do_asce_exception
;
727 pgm_check_table
[0x39] = &do_dat_exception
;
728 pgm_check_table
[0x3A] = &do_dat_exception
;
729 pgm_check_table
[0x3B] = &do_dat_exception
;
730 #endif /* CONFIG_64BIT */
731 pgm_check_table
[0x15] = &operand_exception
;
732 pgm_check_table
[0x1C] = &space_switch_exception
;
733 pgm_check_table
[0x1D] = &hfp_sqrt_exception
;
734 /* Enable machine checks early. */