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[S390] user space fault: report fault before calling do_exit
[linux-2.6/kvm.git] / arch / s390 / kernel / traps.c
blobe605f070610c21f451e1fe3aa4e55be41dfb6758
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/tracehook.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/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>
38 #include <asm/io.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>
45 #include "entry.h"
46
47 pgm_check_handler_t *pgm_check_table[128];
48
49 #ifdef CONFIG_SYSCTL
50 #ifdef CONFIG_PROCESS_DEBUG
51 int sysctl_userprocess_debug = 1;
52 #else
53 int sysctl_userprocess_debug = 0;
54 #endif
55 #endif
56
57 extern pgm_check_handler_t do_protection_exception;
58 extern pgm_check_handler_t do_dat_exception;
59 extern pgm_check_handler_t do_asce_exception;
60
61 #define stack_pointer ({ void **sp; asm("la %0,0(15)" : "=&d" (sp)); sp; })
62
63 #ifndef CONFIG_64BIT
64 #define LONG "%08lx "
65 #define FOURLONG "%08lx %08lx %08lx %08lx\n"
66 static int kstack_depth_to_print = 12;
67 #else /* CONFIG_64BIT */
68 #define LONG "%016lx "
69 #define FOURLONG "%016lx %016lx %016lx %016lx\n"
70 static int kstack_depth_to_print = 20;
71 #endif /* CONFIG_64BIT */
72
73 /*
74 * For show_trace we have tree different stack to consider:
75 * - the panic stack which is used if the kernel stack has overflown
76 * - the asynchronous interrupt stack (cpu related)
77 * - the synchronous kernel stack (process related)
78 * The stack trace can start at any of the three stack and can potentially
79 * touch all of them. The order is: panic stack, async stack, sync stack.
80 */
81 static unsigned long
82 __show_trace(unsigned long sp, unsigned long low, unsigned long high)
83 {
84 struct stack_frame *sf;
85 struct pt_regs *regs;
86
87 while (1) {
88 sp = sp & PSW_ADDR_INSN;
89 if (sp < low || sp > high - sizeof(*sf))
90 return sp;
91 sf = (struct stack_frame *) sp;
92 printk("([<%016lx>] ", sf->gprs[8] & PSW_ADDR_INSN);
93 print_symbol("%s)\n", sf->gprs[8] & PSW_ADDR_INSN);
94 /* Follow the backchain. */
95 while (1) {
96 low = sp;
97 sp = sf->back_chain & PSW_ADDR_INSN;
98 if (!sp)
99 break;
100 if (sp <= low || sp > high - sizeof(*sf))
101 return sp;
102 sf = (struct stack_frame *) sp;
103 printk(" [<%016lx>] ", sf->gprs[8] & PSW_ADDR_INSN);
104 print_symbol("%s\n", sf->gprs[8] & PSW_ADDR_INSN);
105 }
106 /* Zero backchain detected, check for interrupt frame. */
107 sp = (unsigned long) (sf + 1);
108 if (sp <= low || sp > high - sizeof(*regs))
109 return sp;
110 regs = (struct pt_regs *) sp;
111 printk(" [<%016lx>] ", regs->psw.addr & PSW_ADDR_INSN);
112 print_symbol("%s\n", regs->psw.addr & PSW_ADDR_INSN);
113 low = sp;
114 sp = regs->gprs[15];
115 }
116 }
117
118 static void show_trace(struct task_struct *task, unsigned long *stack)
119 {
120 register unsigned long __r15 asm ("15");
121 unsigned long sp;
122
123 sp = (unsigned long) stack;
124 if (!sp)
125 sp = task ? task->thread.ksp : __r15;
126 printk("Call Trace:\n");
127 #ifdef CONFIG_CHECK_STACK
128 sp = __show_trace(sp, S390_lowcore.panic_stack - 4096,
129 S390_lowcore.panic_stack);
130 #endif
131 sp = __show_trace(sp, S390_lowcore.async_stack - ASYNC_SIZE,
132 S390_lowcore.async_stack);
133 if (task)
134 __show_trace(sp, (unsigned long) task_stack_page(task),
135 (unsigned long) task_stack_page(task) + THREAD_SIZE);
136 else
137 __show_trace(sp, S390_lowcore.thread_info,
138 S390_lowcore.thread_info + THREAD_SIZE);
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(LONG, *stack++);
161 }
162 printk("\n");
163 show_trace(task, sp);
164 }
165
166 static void show_last_breaking_event(struct pt_regs *regs)
167 {
168 #ifdef CONFIG_64BIT
169 printk("Last Breaking-Event-Address:\n");
170 printk(" [<%016lx>] ", regs->args[0] & PSW_ADDR_INSN);
171 print_symbol("%s\n", regs->args[0] & PSW_ADDR_INSN);
172 #endif
173 }
174
175 /*
176 * The architecture-independent dump_stack generator
177 */
178 void dump_stack(void)
179 {
180 printk("CPU: %d %s %s %.*s\n",
181 task_thread_info(current)->cpu, print_tainted(),
182 init_utsname()->release,
183 (int)strcspn(init_utsname()->version, " "),
184 init_utsname()->version);
185 printk("Process %s (pid: %d, task: %p, ksp: %p)\n",
186 current->comm, current->pid, current,
187 (void *) current->thread.ksp);
188 show_stack(NULL, NULL);
189 }
190 EXPORT_SYMBOL(dump_stack);
191
192 static inline int mask_bits(struct pt_regs *regs, unsigned long bits)
193 {
194 return (regs->psw.mask & bits) / ((~bits + 1) & bits);
195 }
196
197 void show_registers(struct pt_regs *regs)
198 {
199 char *mode;
200
201 mode = (regs->psw.mask & PSW_MASK_PSTATE) ? "User" : "Krnl";
202 printk("%s PSW : %p %p",
203 mode, (void *) regs->psw.mask,
204 (void *) regs->psw.addr);
205 print_symbol(" (%s)\n", regs->psw.addr & PSW_ADDR_INSN);
206 printk(" R:%x T:%x IO:%x EX:%x Key:%x M:%x W:%x "
207 "P:%x AS:%x CC:%x PM:%x", mask_bits(regs, PSW_MASK_PER),
208 mask_bits(regs, PSW_MASK_DAT), mask_bits(regs, PSW_MASK_IO),
209 mask_bits(regs, PSW_MASK_EXT), mask_bits(regs, PSW_MASK_KEY),
210 mask_bits(regs, PSW_MASK_MCHECK), mask_bits(regs, PSW_MASK_WAIT),
211 mask_bits(regs, PSW_MASK_PSTATE), mask_bits(regs, PSW_MASK_ASC),
212 mask_bits(regs, PSW_MASK_CC), mask_bits(regs, PSW_MASK_PM));
213 #ifdef CONFIG_64BIT
214 printk(" EA:%x", mask_bits(regs, PSW_BASE_BITS));
215 #endif
216 printk("\n%s GPRS: " FOURLONG, mode,
217 regs->gprs[0], regs->gprs[1], regs->gprs[2], regs->gprs[3]);
218 printk(" " FOURLONG,
219 regs->gprs[4], regs->gprs[5], regs->gprs[6], regs->gprs[7]);
220 printk(" " FOURLONG,
221 regs->gprs[8], regs->gprs[9], regs->gprs[10], regs->gprs[11]);
222 printk(" " FOURLONG,
223 regs->gprs[12], regs->gprs[13], regs->gprs[14], regs->gprs[15]);
224
225 show_code(regs);
226 }
227
228 void show_regs(struct pt_regs *regs)
229 {
230 print_modules();
231 printk("CPU: %d %s %s %.*s\n",
232 task_thread_info(current)->cpu, print_tainted(),
233 init_utsname()->release,
234 (int)strcspn(init_utsname()->version, " "),
235 init_utsname()->version);
236 printk("Process %s (pid: %d, task: %p, ksp: %p)\n",
237 current->comm, current->pid, current,
238 (void *) current->thread.ksp);
239 show_registers(regs);
240 /* Show stack backtrace if pt_regs is from kernel mode */
241 if (!(regs->psw.mask & PSW_MASK_PSTATE))
242 show_trace(NULL, (unsigned long *) regs->gprs[15]);
243 show_last_breaking_event(regs);
244 }
245
246 /* This is called from fs/proc/array.c */
247 void task_show_regs(struct seq_file *m, struct task_struct *task)
248 {
249 struct pt_regs *regs;
250
251 regs = task_pt_regs(task);
252 seq_printf(m, "task: %p, ksp: %p\n",
253 task, (void *)task->thread.ksp);
254 seq_printf(m, "User PSW : %p %p\n",
255 (void *) regs->psw.mask, (void *)regs->psw.addr);
256
257 seq_printf(m, "User GPRS: " FOURLONG,
258 regs->gprs[0], regs->gprs[1],
259 regs->gprs[2], regs->gprs[3]);
260 seq_printf(m, " " FOURLONG,
261 regs->gprs[4], regs->gprs[5],
262 regs->gprs[6], regs->gprs[7]);
263 seq_printf(m, " " FOURLONG,
264 regs->gprs[8], regs->gprs[9],
265 regs->gprs[10], regs->gprs[11]);
266 seq_printf(m, " " FOURLONG,
267 regs->gprs[12], regs->gprs[13],
268 regs->gprs[14], regs->gprs[15]);
269 seq_printf(m, "User ACRS: %08x %08x %08x %08x\n",
270 task->thread.acrs[0], task->thread.acrs[1],
271 task->thread.acrs[2], task->thread.acrs[3]);
272 seq_printf(m, " %08x %08x %08x %08x\n",
273 task->thread.acrs[4], task->thread.acrs[5],
274 task->thread.acrs[6], task->thread.acrs[7]);
275 seq_printf(m, " %08x %08x %08x %08x\n",
276 task->thread.acrs[8], task->thread.acrs[9],
277 task->thread.acrs[10], task->thread.acrs[11]);
278 seq_printf(m, " %08x %08x %08x %08x\n",
279 task->thread.acrs[12], task->thread.acrs[13],
280 task->thread.acrs[14], task->thread.acrs[15]);
281 }
282
283 static DEFINE_SPINLOCK(die_lock);
284
285 void die(const char * str, struct pt_regs * regs, long err)
286 {
287 static int die_counter;
288
289 oops_enter();
290 debug_stop_all();
291 console_verbose();
292 spin_lock_irq(&die_lock);
293 bust_spinlocks(1);
294 printk("%s: %04lx [#%d] ", str, err & 0xffff, ++die_counter);
295 #ifdef CONFIG_PREEMPT
296 printk("PREEMPT ");
297 #endif
298 #ifdef CONFIG_SMP
299 printk("SMP ");
300 #endif
301 #ifdef CONFIG_DEBUG_PAGEALLOC
302 printk("DEBUG_PAGEALLOC");
303 #endif
304 printk("\n");
305 notify_die(DIE_OOPS, str, regs, err, current->thread.trap_no, SIGSEGV);
306 show_regs(regs);
307 bust_spinlocks(0);
308 add_taint(TAINT_DIE);
309 spin_unlock_irq(&die_lock);
310 if (in_interrupt())
311 panic("Fatal exception in interrupt");
312 if (panic_on_oops)
313 panic("Fatal exception: panic_on_oops");
314 oops_exit();
315 do_exit(SIGSEGV);
316 }
317
318 static void inline
319 report_user_fault(long interruption_code, struct pt_regs *regs)
320 {
321 #if defined(CONFIG_SYSCTL)
322 if (!sysctl_userprocess_debug)
323 return;
324 #endif
325 #if defined(CONFIG_SYSCTL) || defined(CONFIG_PROCESS_DEBUG)
326 printk("User process fault: interruption code 0x%lX\n",
327 interruption_code);
328 show_regs(regs);
329 #endif
330 }
331
332 int is_valid_bugaddr(unsigned long addr)
333 {
334 return 1;
335 }
336
337 static void __kprobes inline do_trap(long interruption_code, int signr,
338 char *str, struct pt_regs *regs,
339 siginfo_t *info)
340 {
341 /*
342 * We got all needed information from the lowcore and can
343 * now safely switch on interrupts.
344 */
345 if (regs->psw.mask & PSW_MASK_PSTATE)
346 local_irq_enable();
347
348 if (notify_die(DIE_TRAP, str, regs, interruption_code,
349 interruption_code, signr) == NOTIFY_STOP)
350 return;
351
352 if (regs->psw.mask & PSW_MASK_PSTATE) {
353 struct task_struct *tsk = current;
354
355 tsk->thread.trap_no = interruption_code & 0xffff;
356 force_sig_info(signr, info, tsk);
357 report_user_fault(interruption_code, regs);
358 } else {
359 const struct exception_table_entry *fixup;
360 fixup = search_exception_tables(regs->psw.addr & PSW_ADDR_INSN);
361 if (fixup)
362 regs->psw.addr = fixup->fixup | PSW_ADDR_AMODE;
363 else {
364 enum bug_trap_type btt;
365
366 btt = report_bug(regs->psw.addr & PSW_ADDR_INSN, regs);
367 if (btt == BUG_TRAP_TYPE_WARN)
368 return;
369 die(str, regs, interruption_code);
370 }
371 }
372 }
373
374 static inline void __user *get_check_address(struct pt_regs *regs)
375 {
376 return (void __user *)((regs->psw.addr-S390_lowcore.pgm_ilc) & PSW_ADDR_INSN);
377 }
378
379 void __kprobes do_single_step(struct pt_regs *regs)
380 {
381 if (notify_die(DIE_SSTEP, "sstep", regs, 0, 0,
382 SIGTRAP) == NOTIFY_STOP){
383 return;
384 }
385 if (tracehook_consider_fatal_signal(current, SIGTRAP))
386 force_sig(SIGTRAP, current);
387 }
388
389 static void default_trap_handler(struct pt_regs * regs, long interruption_code)
390 {
391 if (regs->psw.mask & PSW_MASK_PSTATE) {
392 local_irq_enable();
393 report_user_fault(interruption_code, regs);
394 do_exit(SIGSEGV);
395 } else
396 die("Unknown program exception", regs, interruption_code);
397 }
398
399 #define DO_ERROR_INFO(signr, str, name, sicode, siaddr) \
400 static void name(struct pt_regs * regs, long interruption_code) \
401 { \
402 siginfo_t info; \
403 info.si_signo = signr; \
404 info.si_errno = 0; \
405 info.si_code = sicode; \
406 info.si_addr = siaddr; \
407 do_trap(interruption_code, signr, str, regs, &info); \
408 }
409
410 DO_ERROR_INFO(SIGILL, "addressing exception", addressing_exception,
411 ILL_ILLADR, get_check_address(regs))
412 DO_ERROR_INFO(SIGILL, "execute exception", execute_exception,
413 ILL_ILLOPN, get_check_address(regs))
414 DO_ERROR_INFO(SIGFPE, "fixpoint divide exception", divide_exception,
415 FPE_INTDIV, get_check_address(regs))
416 DO_ERROR_INFO(SIGFPE, "fixpoint overflow exception", overflow_exception,
417 FPE_INTOVF, get_check_address(regs))
418 DO_ERROR_INFO(SIGFPE, "HFP overflow exception", hfp_overflow_exception,
419 FPE_FLTOVF, get_check_address(regs))
420 DO_ERROR_INFO(SIGFPE, "HFP underflow exception", hfp_underflow_exception,
421 FPE_FLTUND, get_check_address(regs))
422 DO_ERROR_INFO(SIGFPE, "HFP significance exception", hfp_significance_exception,
423 FPE_FLTRES, get_check_address(regs))
424 DO_ERROR_INFO(SIGFPE, "HFP divide exception", hfp_divide_exception,
425 FPE_FLTDIV, get_check_address(regs))
426 DO_ERROR_INFO(SIGFPE, "HFP square root exception", hfp_sqrt_exception,
427 FPE_FLTINV, get_check_address(regs))
428 DO_ERROR_INFO(SIGILL, "operand exception", operand_exception,
429 ILL_ILLOPN, get_check_address(regs))
430 DO_ERROR_INFO(SIGILL, "privileged operation", privileged_op,
431 ILL_PRVOPC, get_check_address(regs))
432 DO_ERROR_INFO(SIGILL, "special operation exception", special_op_exception,
433 ILL_ILLOPN, get_check_address(regs))
434 DO_ERROR_INFO(SIGILL, "translation exception", translation_exception,
435 ILL_ILLOPN, get_check_address(regs))
436
437 static inline void
438 do_fp_trap(struct pt_regs *regs, void __user *location,
439 int fpc, long interruption_code)
440 {
441 siginfo_t si;
442
443 si.si_signo = SIGFPE;
444 si.si_errno = 0;
445 si.si_addr = location;
446 si.si_code = 0;
447 /* FPC[2] is Data Exception Code */
448 if ((fpc & 0x00000300) == 0) {
449 /* bits 6 and 7 of DXC are 0 iff IEEE exception */
450 if (fpc & 0x8000) /* invalid fp operation */
451 si.si_code = FPE_FLTINV;
452 else if (fpc & 0x4000) /* div by 0 */
453 si.si_code = FPE_FLTDIV;
454 else if (fpc & 0x2000) /* overflow */
455 si.si_code = FPE_FLTOVF;
456 else if (fpc & 0x1000) /* underflow */
457 si.si_code = FPE_FLTUND;
458 else if (fpc & 0x0800) /* inexact */
459 si.si_code = FPE_FLTRES;
460 }
461 current->thread.ieee_instruction_pointer = (addr_t) location;
462 do_trap(interruption_code, SIGFPE,
463 "floating point exception", regs, &si);
464 }
465
466 static void illegal_op(struct pt_regs * regs, long interruption_code)
467 {
468 siginfo_t info;
469 __u8 opcode[6];
470 __u16 __user *location;
471 int signal = 0;
472
473 location = get_check_address(regs);
474
475 /*
476 * We got all needed information from the lowcore and can
477 * now safely switch on interrupts.
478 */
479 if (regs->psw.mask & PSW_MASK_PSTATE)
480 local_irq_enable();
481
482 if (regs->psw.mask & PSW_MASK_PSTATE) {
483 if (get_user(*((__u16 *) opcode), (__u16 __user *) location))
484 return;
485 if (*((__u16 *) opcode) == S390_BREAKPOINT_U16) {
486 if (tracehook_consider_fatal_signal(current, SIGTRAP))
487 force_sig(SIGTRAP, current);
488 else
489 signal = SIGILL;
490 #ifdef CONFIG_MATHEMU
491 } else if (opcode[0] == 0xb3) {
492 if (get_user(*((__u16 *) (opcode+2)), location+1))
493 return;
494 signal = math_emu_b3(opcode, regs);
495 } else if (opcode[0] == 0xed) {
496 if (get_user(*((__u32 *) (opcode+2)),
497 (__u32 __user *)(location+1)))
498 return;
499 signal = math_emu_ed(opcode, regs);
500 } else if (*((__u16 *) opcode) == 0xb299) {
501 if (get_user(*((__u16 *) (opcode+2)), location+1))
502 return;
503 signal = math_emu_srnm(opcode, regs);
504 } else if (*((__u16 *) opcode) == 0xb29c) {
505 if (get_user(*((__u16 *) (opcode+2)), location+1))
506 return;
507 signal = math_emu_stfpc(opcode, regs);
508 } else if (*((__u16 *) opcode) == 0xb29d) {
509 if (get_user(*((__u16 *) (opcode+2)), location+1))
510 return;
511 signal = math_emu_lfpc(opcode, regs);
512 #endif
513 } else
514 signal = SIGILL;
515 } else {
516 /*
517 * If we get an illegal op in kernel mode, send it through the
518 * kprobes notifier. If kprobes doesn't pick it up, SIGILL
519 */
520 if (notify_die(DIE_BPT, "bpt", regs, interruption_code,
521 3, SIGTRAP) != NOTIFY_STOP)
522 signal = SIGILL;
523 }
524
525 #ifdef CONFIG_MATHEMU
526 if (signal == SIGFPE)
527 do_fp_trap(regs, location,
528 current->thread.fp_regs.fpc, interruption_code);
529 else if (signal == SIGSEGV) {
530 info.si_signo = signal;
531 info.si_errno = 0;
532 info.si_code = SEGV_MAPERR;
533 info.si_addr = (void __user *) location;
534 do_trap(interruption_code, signal,
535 "user address fault", regs, &info);
536 } else
537 #endif
538 if (signal) {
539 info.si_signo = signal;
540 info.si_errno = 0;
541 info.si_code = ILL_ILLOPC;
542 info.si_addr = (void __user *) location;
543 do_trap(interruption_code, signal,
544 "illegal operation", regs, &info);
545 }
546 }
547
548
549 #ifdef CONFIG_MATHEMU
550 asmlinkage void
551 specification_exception(struct pt_regs * regs, long interruption_code)
552 {
553 __u8 opcode[6];
554 __u16 __user *location = NULL;
555 int signal = 0;
556
557 location = (__u16 __user *) get_check_address(regs);
558
559 /*
560 * We got all needed information from the lowcore and can
561 * now safely switch on interrupts.
562 */
563 if (regs->psw.mask & PSW_MASK_PSTATE)
564 local_irq_enable();
565
566 if (regs->psw.mask & PSW_MASK_PSTATE) {
567 get_user(*((__u16 *) opcode), location);
568 switch (opcode[0]) {
569 case 0x28: /* LDR Rx,Ry */
570 signal = math_emu_ldr(opcode);
571 break;
572 case 0x38: /* LER Rx,Ry */
573 signal = math_emu_ler(opcode);
574 break;
575 case 0x60: /* STD R,D(X,B) */
576 get_user(*((__u16 *) (opcode+2)), location+1);
577 signal = math_emu_std(opcode, regs);
578 break;
579 case 0x68: /* LD R,D(X,B) */
580 get_user(*((__u16 *) (opcode+2)), location+1);
581 signal = math_emu_ld(opcode, regs);
582 break;
583 case 0x70: /* STE R,D(X,B) */
584 get_user(*((__u16 *) (opcode+2)), location+1);
585 signal = math_emu_ste(opcode, regs);
586 break;
587 case 0x78: /* LE R,D(X,B) */
588 get_user(*((__u16 *) (opcode+2)), location+1);
589 signal = math_emu_le(opcode, regs);
590 break;
591 default:
592 signal = SIGILL;
593 break;
594 }
595 } else
596 signal = SIGILL;
597
598 if (signal == SIGFPE)
599 do_fp_trap(regs, location,
600 current->thread.fp_regs.fpc, interruption_code);
601 else if (signal) {
602 siginfo_t info;
603 info.si_signo = signal;
604 info.si_errno = 0;
605 info.si_code = ILL_ILLOPN;
606 info.si_addr = location;
607 do_trap(interruption_code, signal,
608 "specification exception", regs, &info);
609 }
610 }
611 #else
612 DO_ERROR_INFO(SIGILL, "specification exception", specification_exception,
613 ILL_ILLOPN, get_check_address(regs));
614 #endif
615
616 static void data_exception(struct pt_regs * regs, long interruption_code)
617 {
618 __u16 __user *location;
619 int signal = 0;
620
621 location = get_check_address(regs);
622
623 /*
624 * We got all needed information from the lowcore and can
625 * now safely switch on interrupts.
626 */
627 if (regs->psw.mask & PSW_MASK_PSTATE)
628 local_irq_enable();
629
630 if (MACHINE_HAS_IEEE)
631 asm volatile("stfpc %0" : "=m" (current->thread.fp_regs.fpc));
632
633 #ifdef CONFIG_MATHEMU
634 else if (regs->psw.mask & PSW_MASK_PSTATE) {
635 __u8 opcode[6];
636 get_user(*((__u16 *) opcode), location);
637 switch (opcode[0]) {
638 case 0x28: /* LDR Rx,Ry */
639 signal = math_emu_ldr(opcode);
640 break;
641 case 0x38: /* LER Rx,Ry */
642 signal = math_emu_ler(opcode);
643 break;
644 case 0x60: /* STD R,D(X,B) */
645 get_user(*((__u16 *) (opcode+2)), location+1);
646 signal = math_emu_std(opcode, regs);
647 break;
648 case 0x68: /* LD R,D(X,B) */
649 get_user(*((__u16 *) (opcode+2)), location+1);
650 signal = math_emu_ld(opcode, regs);
651 break;
652 case 0x70: /* STE R,D(X,B) */
653 get_user(*((__u16 *) (opcode+2)), location+1);
654 signal = math_emu_ste(opcode, regs);
655 break;
656 case 0x78: /* LE R,D(X,B) */
657 get_user(*((__u16 *) (opcode+2)), location+1);
658 signal = math_emu_le(opcode, regs);
659 break;
660 case 0xb3:
661 get_user(*((__u16 *) (opcode+2)), location+1);
662 signal = math_emu_b3(opcode, regs);
663 break;
664 case 0xed:
665 get_user(*((__u32 *) (opcode+2)),
666 (__u32 __user *)(location+1));
667 signal = math_emu_ed(opcode, regs);
668 break;
669 case 0xb2:
670 if (opcode[1] == 0x99) {
671 get_user(*((__u16 *) (opcode+2)), location+1);
672 signal = math_emu_srnm(opcode, regs);
673 } else if (opcode[1] == 0x9c) {
674 get_user(*((__u16 *) (opcode+2)), location+1);
675 signal = math_emu_stfpc(opcode, regs);
676 } else if (opcode[1] == 0x9d) {
677 get_user(*((__u16 *) (opcode+2)), location+1);
678 signal = math_emu_lfpc(opcode, regs);
679 } else
680 signal = SIGILL;
681 break;
682 default:
683 signal = SIGILL;
684 break;
685 }
686 }
687 #endif
688 if (current->thread.fp_regs.fpc & FPC_DXC_MASK)
689 signal = SIGFPE;
690 else
691 signal = SIGILL;
692 if (signal == SIGFPE)
693 do_fp_trap(regs, location,
694 current->thread.fp_regs.fpc, interruption_code);
695 else if (signal) {
696 siginfo_t info;
697 info.si_signo = signal;
698 info.si_errno = 0;
699 info.si_code = ILL_ILLOPN;
700 info.si_addr = location;
701 do_trap(interruption_code, signal,
702 "data exception", regs, &info);
703 }
704 }
705
706 static void space_switch_exception(struct pt_regs * regs, long int_code)
707 {
708 siginfo_t info;
709
710 /* Set user psw back to home space mode. */
711 if (regs->psw.mask & PSW_MASK_PSTATE)
712 regs->psw.mask |= PSW_ASC_HOME;
713 /* Send SIGILL. */
714 info.si_signo = SIGILL;
715 info.si_errno = 0;
716 info.si_code = ILL_PRVOPC;
717 info.si_addr = get_check_address(regs);
718 do_trap(int_code, SIGILL, "space switch event", regs, &info);
719 }
720
721 asmlinkage void kernel_stack_overflow(struct pt_regs * regs)
722 {
723 bust_spinlocks(1);
724 printk("Kernel stack overflow.\n");
725 show_regs(regs);
726 bust_spinlocks(0);
727 panic("Corrupt kernel stack, can't continue.");
728 }
729
730 /* init is done in lowcore.S and head.S */
731
732 void __init trap_init(void)
733 {
734 int i;
735
736 for (i = 0; i < 128; i++)
737 pgm_check_table[i] = &default_trap_handler;
738 pgm_check_table[1] = &illegal_op;
739 pgm_check_table[2] = &privileged_op;
740 pgm_check_table[3] = &execute_exception;
741 pgm_check_table[4] = &do_protection_exception;
742 pgm_check_table[5] = &addressing_exception;
743 pgm_check_table[6] = &specification_exception;
744 pgm_check_table[7] = &data_exception;
745 pgm_check_table[8] = &overflow_exception;
746 pgm_check_table[9] = &divide_exception;
747 pgm_check_table[0x0A] = &overflow_exception;
748 pgm_check_table[0x0B] = &divide_exception;
749 pgm_check_table[0x0C] = &hfp_overflow_exception;
750 pgm_check_table[0x0D] = &hfp_underflow_exception;
751 pgm_check_table[0x0E] = &hfp_significance_exception;
752 pgm_check_table[0x0F] = &hfp_divide_exception;
753 pgm_check_table[0x10] = &do_dat_exception;
754 pgm_check_table[0x11] = &do_dat_exception;
755 pgm_check_table[0x12] = &translation_exception;
756 pgm_check_table[0x13] = &special_op_exception;
757 #ifdef CONFIG_64BIT
758 pgm_check_table[0x38] = &do_asce_exception;
759 pgm_check_table[0x39] = &do_dat_exception;
760 pgm_check_table[0x3A] = &do_dat_exception;
761 pgm_check_table[0x3B] = &do_dat_exception;
762 #endif /* CONFIG_64BIT */
763 pgm_check_table[0x15] = &operand_exception;
764 pgm_check_table[0x1C] = &space_switch_exception;
765 pgm_check_table[0x1D] = &hfp_sqrt_exception;
766 pfault_irq_init();
767 }
kernel-based virtual machine