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PRCM: 34XX: Fix wrong shift value used in dpll4_m4x2_ck enable bit
[linux-ginger.git] / arch / s390 / kernel / traps.c
blob4584d81984c0f25dabb4bffc17371866081ed6a5
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/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 FOURLONG "%08lx %08lx %08lx %08lx\n"
65 static int kstack_depth_to_print = 12;
66 #else /* CONFIG_64BIT */
67 #define FOURLONG "%016lx %016lx %016lx %016lx\n"
68 static int kstack_depth_to_print = 20;
69 #endif /* CONFIG_64BIT */
70
71 /*
72 * For show_trace we have tree different stack to consider:
73 * - the panic stack which is used if the kernel stack has overflown
74 * - the asynchronous interrupt stack (cpu related)
75 * - the synchronous kernel stack (process related)
76 * The stack trace can start at any of the three stack and can potentially
77 * touch all of them. The order is: panic stack, async stack, sync stack.
78 */
79 static unsigned long
80 __show_trace(unsigned long sp, unsigned long low, unsigned long high)
81 {
82 struct stack_frame *sf;
83 struct pt_regs *regs;
84
85 while (1) {
86 sp = sp & PSW_ADDR_INSN;
87 if (sp < low || sp > high - sizeof(*sf))
88 return sp;
89 sf = (struct stack_frame *) sp;
90 printk("([<%016lx>] ", sf->gprs[8] & PSW_ADDR_INSN);
91 print_symbol("%s)\n", sf->gprs[8] & PSW_ADDR_INSN);
92 /* Follow the backchain. */
93 while (1) {
94 low = sp;
95 sp = sf->back_chain & PSW_ADDR_INSN;
96 if (!sp)
97 break;
98 if (sp <= low || sp > high - sizeof(*sf))
99 return sp;
100 sf = (struct stack_frame *) sp;
101 printk(" [<%016lx>] ", sf->gprs[8] & PSW_ADDR_INSN);
102 print_symbol("%s\n", sf->gprs[8] & PSW_ADDR_INSN);
103 }
104 /* Zero backchain detected, check for interrupt frame. */
105 sp = (unsigned long) (sf + 1);
106 if (sp <= low || sp > high - sizeof(*regs))
107 return sp;
108 regs = (struct pt_regs *) sp;
109 printk(" [<%016lx>] ", regs->psw.addr & PSW_ADDR_INSN);
110 print_symbol("%s\n", regs->psw.addr & PSW_ADDR_INSN);
111 low = sp;
112 sp = regs->gprs[15];
113 }
114 }
115
116 static void show_trace(struct task_struct *task, unsigned long *stack)
117 {
118 register unsigned long __r15 asm ("15");
119 unsigned long sp;
120
121 sp = (unsigned long) stack;
122 if (!sp)
123 sp = task ? task->thread.ksp : __r15;
124 printk("Call Trace:\n");
125 #ifdef CONFIG_CHECK_STACK
126 sp = __show_trace(sp, S390_lowcore.panic_stack - 4096,
127 S390_lowcore.panic_stack);
128 #endif
129 sp = __show_trace(sp, S390_lowcore.async_stack - ASYNC_SIZE,
130 S390_lowcore.async_stack);
131 if (task)
132 __show_trace(sp, (unsigned long) task_stack_page(task),
133 (unsigned long) task_stack_page(task) + THREAD_SIZE);
134 else
135 __show_trace(sp, S390_lowcore.thread_info,
136 S390_lowcore.thread_info + THREAD_SIZE);
137 if (!task)
138 task = current;
139 debug_show_held_locks(task);
140 }
141
142 void show_stack(struct task_struct *task, unsigned long *sp)
143 {
144 register unsigned long * __r15 asm ("15");
145 unsigned long *stack;
146 int i;
147
148 if (!sp)
149 stack = task ? (unsigned long *) task->thread.ksp : __r15;
150 else
151 stack = sp;
152
153 for (i = 0; i < kstack_depth_to_print; i++) {
154 if (((addr_t) stack & (THREAD_SIZE-1)) == 0)
155 break;
156 if (i && ((i * sizeof (long) % 32) == 0))
157 printk("\n ");
158 printk("%p ", (void *)*stack++);
159 }
160 printk("\n");
161 show_trace(task, sp);
162 }
163
164 static void show_last_breaking_event(struct pt_regs *regs)
165 {
166 #ifdef CONFIG_64BIT
167 printk("Last Breaking-Event-Address:\n");
168 printk(" [<%016lx>] ", regs->args[0] & PSW_ADDR_INSN);
169 print_symbol("%s\n", regs->args[0] & PSW_ADDR_INSN);
170 #endif
171 }
172
173 /*
174 * The architecture-independent dump_stack generator
175 */
176 void dump_stack(void)
177 {
178 printk("CPU: %d %s %s %.*s\n",
179 task_thread_info(current)->cpu, print_tainted(),
180 init_utsname()->release,
181 (int)strcspn(init_utsname()->version, " "),
182 init_utsname()->version);
183 printk("Process %s (pid: %d, task: %p, ksp: %p)\n",
184 current->comm, current->pid, current,
185 (void *) current->thread.ksp);
186 show_stack(NULL, NULL);
187 }
188 EXPORT_SYMBOL(dump_stack);
189
190 static inline int mask_bits(struct pt_regs *regs, unsigned long bits)
191 {
192 return (regs->psw.mask & bits) / ((~bits + 1) & bits);
193 }
194
195 void show_registers(struct pt_regs *regs)
196 {
197 char *mode;
198
199 mode = (regs->psw.mask & PSW_MASK_PSTATE) ? "User" : "Krnl";
200 printk("%s PSW : %p %p",
201 mode, (void *) regs->psw.mask,
202 (void *) regs->psw.addr);
203 print_symbol(" (%s)\n", regs->psw.addr & PSW_ADDR_INSN);
204 printk(" R:%x T:%x IO:%x EX:%x Key:%x M:%x W:%x "
205 "P:%x AS:%x CC:%x PM:%x", mask_bits(regs, PSW_MASK_PER),
206 mask_bits(regs, PSW_MASK_DAT), mask_bits(regs, PSW_MASK_IO),
207 mask_bits(regs, PSW_MASK_EXT), mask_bits(regs, PSW_MASK_KEY),
208 mask_bits(regs, PSW_MASK_MCHECK), mask_bits(regs, PSW_MASK_WAIT),
209 mask_bits(regs, PSW_MASK_PSTATE), mask_bits(regs, PSW_MASK_ASC),
210 mask_bits(regs, PSW_MASK_CC), mask_bits(regs, PSW_MASK_PM));
211 #ifdef CONFIG_64BIT
212 printk(" EA:%x", mask_bits(regs, PSW_BASE_BITS));
213 #endif
214 printk("\n%s GPRS: " FOURLONG, mode,
215 regs->gprs[0], regs->gprs[1], regs->gprs[2], regs->gprs[3]);
216 printk(" " FOURLONG,
217 regs->gprs[4], regs->gprs[5], regs->gprs[6], regs->gprs[7]);
218 printk(" " FOURLONG,
219 regs->gprs[8], regs->gprs[9], regs->gprs[10], regs->gprs[11]);
220 printk(" " FOURLONG,
221 regs->gprs[12], regs->gprs[13], regs->gprs[14], regs->gprs[15]);
222
223 show_code(regs);
224 }
225
226 void show_regs(struct pt_regs *regs)
227 {
228 print_modules();
229 printk("CPU: %d %s %s %.*s\n",
230 task_thread_info(current)->cpu, print_tainted(),
231 init_utsname()->release,
232 (int)strcspn(init_utsname()->version, " "),
233 init_utsname()->version);
234 printk("Process %s (pid: %d, task: %p, ksp: %p)\n",
235 current->comm, current->pid, current,
236 (void *) current->thread.ksp);
237 show_registers(regs);
238 /* Show stack backtrace if pt_regs is from kernel mode */
239 if (!(regs->psw.mask & PSW_MASK_PSTATE))
240 show_trace(NULL, (unsigned long *) regs->gprs[15]);
241 show_last_breaking_event(regs);
242 }
243
244 /* This is called from fs/proc/array.c */
245 void task_show_regs(struct seq_file *m, struct task_struct *task)
246 {
247 struct pt_regs *regs;
248
249 regs = task_pt_regs(task);
250 seq_printf(m, "task: %p, ksp: %p\n",
251 task, (void *)task->thread.ksp);
252 seq_printf(m, "User PSW : %p %p\n",
253 (void *) regs->psw.mask, (void *)regs->psw.addr);
254
255 seq_printf(m, "User GPRS: " FOURLONG,
256 regs->gprs[0], regs->gprs[1],
257 regs->gprs[2], regs->gprs[3]);
258 seq_printf(m, " " FOURLONG,
259 regs->gprs[4], regs->gprs[5],
260 regs->gprs[6], regs->gprs[7]);
261 seq_printf(m, " " FOURLONG,
262 regs->gprs[8], regs->gprs[9],
263 regs->gprs[10], regs->gprs[11]);
264 seq_printf(m, " " FOURLONG,
265 regs->gprs[12], regs->gprs[13],
266 regs->gprs[14], regs->gprs[15]);
267 seq_printf(m, "User ACRS: %08x %08x %08x %08x\n",
268 task->thread.acrs[0], task->thread.acrs[1],
269 task->thread.acrs[2], task->thread.acrs[3]);
270 seq_printf(m, " %08x %08x %08x %08x\n",
271 task->thread.acrs[4], task->thread.acrs[5],
272 task->thread.acrs[6], task->thread.acrs[7]);
273 seq_printf(m, " %08x %08x %08x %08x\n",
274 task->thread.acrs[8], task->thread.acrs[9],
275 task->thread.acrs[10], task->thread.acrs[11]);
276 seq_printf(m, " %08x %08x %08x %08x\n",
277 task->thread.acrs[12], task->thread.acrs[13],
278 task->thread.acrs[14], task->thread.acrs[15]);
279 }
280
281 static DEFINE_SPINLOCK(die_lock);
282
283 void die(const char * str, struct pt_regs * regs, long err)
284 {
285 static int die_counter;
286
287 oops_enter();
288 debug_stop_all();
289 console_verbose();
290 spin_lock_irq(&die_lock);
291 bust_spinlocks(1);
292 printk("%s: %04lx [#%d] ", str, err & 0xffff, ++die_counter);
293 #ifdef CONFIG_PREEMPT
294 printk("PREEMPT ");
295 #endif
296 #ifdef CONFIG_SMP
297 printk("SMP ");
298 #endif
299 #ifdef CONFIG_DEBUG_PAGEALLOC
300 printk("DEBUG_PAGEALLOC");
301 #endif
302 printk("\n");
303 notify_die(DIE_OOPS, str, regs, err, current->thread.trap_no, SIGSEGV);
304 show_regs(regs);
305 bust_spinlocks(0);
306 add_taint(TAINT_DIE);
307 spin_unlock_irq(&die_lock);
308 if (in_interrupt())
309 panic("Fatal exception in interrupt");
310 if (panic_on_oops)
311 panic("Fatal exception: panic_on_oops");
312 oops_exit();
313 do_exit(SIGSEGV);
314 }
315
316 static void inline
317 report_user_fault(long interruption_code, struct pt_regs *regs)
318 {
319 #if defined(CONFIG_SYSCTL)
320 if (!sysctl_userprocess_debug)
321 return;
322 #endif
323 #if defined(CONFIG_SYSCTL) || defined(CONFIG_PROCESS_DEBUG)
324 printk("User process fault: interruption code 0x%lX\n",
325 interruption_code);
326 show_regs(regs);
327 #endif
328 }
329
330 int is_valid_bugaddr(unsigned long addr)
331 {
332 return 1;
333 }
334
335 static void __kprobes inline do_trap(long interruption_code, int signr,
336 char *str, struct pt_regs *regs,
337 siginfo_t *info)
338 {
339 /*
340 * We got all needed information from the lowcore and can
341 * now safely switch on interrupts.
342 */
343 if (regs->psw.mask & PSW_MASK_PSTATE)
344 local_irq_enable();
345
346 if (notify_die(DIE_TRAP, str, regs, interruption_code,
347 interruption_code, signr) == NOTIFY_STOP)
348 return;
349
350 if (regs->psw.mask & PSW_MASK_PSTATE) {
351 struct task_struct *tsk = current;
352
353 tsk->thread.trap_no = interruption_code & 0xffff;
354 force_sig_info(signr, info, tsk);
355 report_user_fault(interruption_code, regs);
356 } else {
357 const struct exception_table_entry *fixup;
358 fixup = search_exception_tables(regs->psw.addr & PSW_ADDR_INSN);
359 if (fixup)
360 regs->psw.addr = fixup->fixup | PSW_ADDR_AMODE;
361 else {
362 enum bug_trap_type btt;
363
364 btt = report_bug(regs->psw.addr & PSW_ADDR_INSN, regs);
365 if (btt == BUG_TRAP_TYPE_WARN)
366 return;
367 die(str, regs, interruption_code);
368 }
369 }
370 }
371
372 static inline void __user *get_check_address(struct pt_regs *regs)
373 {
374 return (void __user *)((regs->psw.addr-S390_lowcore.pgm_ilc) & PSW_ADDR_INSN);
375 }
376
377 void __kprobes do_single_step(struct pt_regs *regs)
378 {
379 if (notify_die(DIE_SSTEP, "sstep", regs, 0, 0,
380 SIGTRAP) == NOTIFY_STOP){
381 return;
382 }
383 if ((current->ptrace & PT_PTRACED) != 0)
384 force_sig(SIGTRAP, current);
385 }
386
387 static void default_trap_handler(struct pt_regs * regs, long interruption_code)
388 {
389 if (regs->psw.mask & PSW_MASK_PSTATE) {
390 local_irq_enable();
391 do_exit(SIGSEGV);
392 report_user_fault(interruption_code, regs);
393 } else
394 die("Unknown program exception", regs, interruption_code);
395 }
396
397 #define DO_ERROR_INFO(signr, str, name, sicode, siaddr) \
398 static void name(struct pt_regs * regs, long interruption_code) \
399 { \
400 siginfo_t info; \
401 info.si_signo = signr; \
402 info.si_errno = 0; \
403 info.si_code = sicode; \
404 info.si_addr = siaddr; \
405 do_trap(interruption_code, signr, str, regs, &info); \
406 }
407
408 DO_ERROR_INFO(SIGILL, "addressing exception", addressing_exception,
409 ILL_ILLADR, get_check_address(regs))
410 DO_ERROR_INFO(SIGILL, "execute exception", execute_exception,
411 ILL_ILLOPN, get_check_address(regs))
412 DO_ERROR_INFO(SIGFPE, "fixpoint divide exception", divide_exception,
413 FPE_INTDIV, get_check_address(regs))
414 DO_ERROR_INFO(SIGFPE, "fixpoint overflow exception", overflow_exception,
415 FPE_INTOVF, get_check_address(regs))
416 DO_ERROR_INFO(SIGFPE, "HFP overflow exception", hfp_overflow_exception,
417 FPE_FLTOVF, get_check_address(regs))
418 DO_ERROR_INFO(SIGFPE, "HFP underflow exception", hfp_underflow_exception,
419 FPE_FLTUND, get_check_address(regs))
420 DO_ERROR_INFO(SIGFPE, "HFP significance exception", hfp_significance_exception,
421 FPE_FLTRES, get_check_address(regs))
422 DO_ERROR_INFO(SIGFPE, "HFP divide exception", hfp_divide_exception,
423 FPE_FLTDIV, get_check_address(regs))
424 DO_ERROR_INFO(SIGFPE, "HFP square root exception", hfp_sqrt_exception,
425 FPE_FLTINV, get_check_address(regs))
426 DO_ERROR_INFO(SIGILL, "operand exception", operand_exception,
427 ILL_ILLOPN, get_check_address(regs))
428 DO_ERROR_INFO(SIGILL, "privileged operation", privileged_op,
429 ILL_PRVOPC, get_check_address(regs))
430 DO_ERROR_INFO(SIGILL, "special operation exception", special_op_exception,
431 ILL_ILLOPN, get_check_address(regs))
432 DO_ERROR_INFO(SIGILL, "translation exception", translation_exception,
433 ILL_ILLOPN, get_check_address(regs))
434
435 static inline void
436 do_fp_trap(struct pt_regs *regs, void __user *location,
437 int fpc, long interruption_code)
438 {
439 siginfo_t si;
440
441 si.si_signo = SIGFPE;
442 si.si_errno = 0;
443 si.si_addr = location;
444 si.si_code = 0;
445 /* FPC[2] is Data Exception Code */
446 if ((fpc & 0x00000300) == 0) {
447 /* bits 6 and 7 of DXC are 0 iff IEEE exception */
448 if (fpc & 0x8000) /* invalid fp operation */
449 si.si_code = FPE_FLTINV;
450 else if (fpc & 0x4000) /* div by 0 */
451 si.si_code = FPE_FLTDIV;
452 else if (fpc & 0x2000) /* overflow */
453 si.si_code = FPE_FLTOVF;
454 else if (fpc & 0x1000) /* underflow */
455 si.si_code = FPE_FLTUND;
456 else if (fpc & 0x0800) /* inexact */
457 si.si_code = FPE_FLTRES;
458 }
459 current->thread.ieee_instruction_pointer = (addr_t) location;
460 do_trap(interruption_code, SIGFPE,
461 "floating point exception", regs, &si);
462 }
463
464 static void illegal_op(struct pt_regs * regs, long interruption_code)
465 {
466 siginfo_t info;
467 __u8 opcode[6];
468 __u16 __user *location;
469 int signal = 0;
470
471 location = get_check_address(regs);
472
473 /*
474 * We got all needed information from the lowcore and can
475 * now safely switch on interrupts.
476 */
477 if (regs->psw.mask & PSW_MASK_PSTATE)
478 local_irq_enable();
479
480 if (regs->psw.mask & PSW_MASK_PSTATE) {
481 if (get_user(*((__u16 *) opcode), (__u16 __user *) location))
482 return;
483 if (*((__u16 *) opcode) == S390_BREAKPOINT_U16) {
484 if (current->ptrace & PT_PTRACED)
485 force_sig(SIGTRAP, current);
486 else
487 signal = SIGILL;
488 #ifdef CONFIG_MATHEMU
489 } else if (opcode[0] == 0xb3) {
490 if (get_user(*((__u16 *) (opcode+2)), location+1))
491 return;
492 signal = math_emu_b3(opcode, regs);
493 } else if (opcode[0] == 0xed) {
494 if (get_user(*((__u32 *) (opcode+2)),
495 (__u32 __user *)(location+1)))
496 return;
497 signal = math_emu_ed(opcode, regs);
498 } else if (*((__u16 *) opcode) == 0xb299) {
499 if (get_user(*((__u16 *) (opcode+2)), location+1))
500 return;
501 signal = math_emu_srnm(opcode, regs);
502 } else if (*((__u16 *) opcode) == 0xb29c) {
503 if (get_user(*((__u16 *) (opcode+2)), location+1))
504 return;
505 signal = math_emu_stfpc(opcode, regs);
506 } else if (*((__u16 *) opcode) == 0xb29d) {
507 if (get_user(*((__u16 *) (opcode+2)), location+1))
508 return;
509 signal = math_emu_lfpc(opcode, regs);
510 #endif
511 } else
512 signal = SIGILL;
513 } else {
514 /*
515 * If we get an illegal op in kernel mode, send it through the
516 * kprobes notifier. If kprobes doesn't pick it up, SIGILL
517 */
518 if (notify_die(DIE_BPT, "bpt", regs, interruption_code,
519 3, SIGTRAP) != NOTIFY_STOP)
520 signal = SIGILL;
521 }
522
523 #ifdef CONFIG_MATHEMU
524 if (signal == SIGFPE)
525 do_fp_trap(regs, location,
526 current->thread.fp_regs.fpc, interruption_code);
527 else if (signal == SIGSEGV) {
528 info.si_signo = signal;
529 info.si_errno = 0;
530 info.si_code = SEGV_MAPERR;
531 info.si_addr = (void __user *) location;
532 do_trap(interruption_code, signal,
533 "user address fault", regs, &info);
534 } else
535 #endif
536 if (signal) {
537 info.si_signo = signal;
538 info.si_errno = 0;
539 info.si_code = ILL_ILLOPC;
540 info.si_addr = (void __user *) location;
541 do_trap(interruption_code, signal,
542 "illegal operation", regs, &info);
543 }
544 }
545
546
547 #ifdef CONFIG_MATHEMU
548 asmlinkage void
549 specification_exception(struct pt_regs * regs, long interruption_code)
550 {
551 __u8 opcode[6];
552 __u16 __user *location = NULL;
553 int signal = 0;
554
555 location = (__u16 __user *) get_check_address(regs);
556
557 /*
558 * We got all needed information from the lowcore and can
559 * now safely switch on interrupts.
560 */
561 if (regs->psw.mask & PSW_MASK_PSTATE)
562 local_irq_enable();
563
564 if (regs->psw.mask & PSW_MASK_PSTATE) {
565 get_user(*((__u16 *) opcode), location);
566 switch (opcode[0]) {
567 case 0x28: /* LDR Rx,Ry */
568 signal = math_emu_ldr(opcode);
569 break;
570 case 0x38: /* LER Rx,Ry */
571 signal = math_emu_ler(opcode);
572 break;
573 case 0x60: /* STD R,D(X,B) */
574 get_user(*((__u16 *) (opcode+2)), location+1);
575 signal = math_emu_std(opcode, regs);
576 break;
577 case 0x68: /* LD R,D(X,B) */
578 get_user(*((__u16 *) (opcode+2)), location+1);
579 signal = math_emu_ld(opcode, regs);
580 break;
581 case 0x70: /* STE R,D(X,B) */
582 get_user(*((__u16 *) (opcode+2)), location+1);
583 signal = math_emu_ste(opcode, regs);
584 break;
585 case 0x78: /* LE R,D(X,B) */
586 get_user(*((__u16 *) (opcode+2)), location+1);
587 signal = math_emu_le(opcode, regs);
588 break;
589 default:
590 signal = SIGILL;
591 break;
592 }
593 } else
594 signal = SIGILL;
595
596 if (signal == SIGFPE)
597 do_fp_trap(regs, location,
598 current->thread.fp_regs.fpc, interruption_code);
599 else if (signal) {
600 siginfo_t info;
601 info.si_signo = signal;
602 info.si_errno = 0;
603 info.si_code = ILL_ILLOPN;
604 info.si_addr = location;
605 do_trap(interruption_code, signal,
606 "specification exception", regs, &info);
607 }
608 }
609 #else
610 DO_ERROR_INFO(SIGILL, "specification exception", specification_exception,
611 ILL_ILLOPN, get_check_address(regs));
612 #endif
613
614 static void data_exception(struct pt_regs * regs, long interruption_code)
615 {
616 __u16 __user *location;
617 int signal = 0;
618
619 location = get_check_address(regs);
620
621 /*
622 * We got all needed information from the lowcore and can
623 * now safely switch on interrupts.
624 */
625 if (regs->psw.mask & PSW_MASK_PSTATE)
626 local_irq_enable();
627
628 if (MACHINE_HAS_IEEE)
629 asm volatile("stfpc %0" : "=m" (current->thread.fp_regs.fpc));
630
631 #ifdef CONFIG_MATHEMU
632 else if (regs->psw.mask & PSW_MASK_PSTATE) {
633 __u8 opcode[6];
634 get_user(*((__u16 *) opcode), location);
635 switch (opcode[0]) {
636 case 0x28: /* LDR Rx,Ry */
637 signal = math_emu_ldr(opcode);
638 break;
639 case 0x38: /* LER Rx,Ry */
640 signal = math_emu_ler(opcode);
641 break;
642 case 0x60: /* STD R,D(X,B) */
643 get_user(*((__u16 *) (opcode+2)), location+1);
644 signal = math_emu_std(opcode, regs);
645 break;
646 case 0x68: /* LD R,D(X,B) */
647 get_user(*((__u16 *) (opcode+2)), location+1);
648 signal = math_emu_ld(opcode, regs);
649 break;
650 case 0x70: /* STE R,D(X,B) */
651 get_user(*((__u16 *) (opcode+2)), location+1);
652 signal = math_emu_ste(opcode, regs);
653 break;
654 case 0x78: /* LE R,D(X,B) */
655 get_user(*((__u16 *) (opcode+2)), location+1);
656 signal = math_emu_le(opcode, regs);
657 break;
658 case 0xb3:
659 get_user(*((__u16 *) (opcode+2)), location+1);
660 signal = math_emu_b3(opcode, regs);
661 break;
662 case 0xed:
663 get_user(*((__u32 *) (opcode+2)),
664 (__u32 __user *)(location+1));
665 signal = math_emu_ed(opcode, regs);
666 break;
667 case 0xb2:
668 if (opcode[1] == 0x99) {
669 get_user(*((__u16 *) (opcode+2)), location+1);
670 signal = math_emu_srnm(opcode, regs);
671 } else if (opcode[1] == 0x9c) {
672 get_user(*((__u16 *) (opcode+2)), location+1);
673 signal = math_emu_stfpc(opcode, regs);
674 } else if (opcode[1] == 0x9d) {
675 get_user(*((__u16 *) (opcode+2)), location+1);
676 signal = math_emu_lfpc(opcode, regs);
677 } else
678 signal = SIGILL;
679 break;
680 default:
681 signal = SIGILL;
682 break;
683 }
684 }
685 #endif
686 if (current->thread.fp_regs.fpc & FPC_DXC_MASK)
687 signal = SIGFPE;
688 else
689 signal = SIGILL;
690 if (signal == SIGFPE)
691 do_fp_trap(regs, location,
692 current->thread.fp_regs.fpc, interruption_code);
693 else if (signal) {
694 siginfo_t info;
695 info.si_signo = signal;
696 info.si_errno = 0;
697 info.si_code = ILL_ILLOPN;
698 info.si_addr = location;
699 do_trap(interruption_code, signal,
700 "data exception", regs, &info);
701 }
702 }
703
704 static void space_switch_exception(struct pt_regs * regs, long int_code)
705 {
706 siginfo_t info;
707
708 /* Set user psw back to home space mode. */
709 if (regs->psw.mask & PSW_MASK_PSTATE)
710 regs->psw.mask |= PSW_ASC_HOME;
711 /* Send SIGILL. */
712 info.si_signo = SIGILL;
713 info.si_errno = 0;
714 info.si_code = ILL_PRVOPC;
715 info.si_addr = get_check_address(regs);
716 do_trap(int_code, SIGILL, "space switch event", regs, &info);
717 }
718
719 asmlinkage void kernel_stack_overflow(struct pt_regs * regs)
720 {
721 bust_spinlocks(1);
722 printk("Kernel stack overflow.\n");
723 show_regs(regs);
724 bust_spinlocks(0);
725 panic("Corrupt kernel stack, can't continue.");
726 }
727
728 /* init is done in lowcore.S and head.S */
729
730 void __init trap_init(void)
731 {
732 int i;
733
734 for (i = 0; i < 128; i++)
735 pgm_check_table[i] = &default_trap_handler;
736 pgm_check_table[1] = &illegal_op;
737 pgm_check_table[2] = &privileged_op;
738 pgm_check_table[3] = &execute_exception;
739 pgm_check_table[4] = &do_protection_exception;
740 pgm_check_table[5] = &addressing_exception;
741 pgm_check_table[6] = &specification_exception;
742 pgm_check_table[7] = &data_exception;
743 pgm_check_table[8] = &overflow_exception;
744 pgm_check_table[9] = &divide_exception;
745 pgm_check_table[0x0A] = &overflow_exception;
746 pgm_check_table[0x0B] = &divide_exception;
747 pgm_check_table[0x0C] = &hfp_overflow_exception;
748 pgm_check_table[0x0D] = &hfp_underflow_exception;
749 pgm_check_table[0x0E] = &hfp_significance_exception;
750 pgm_check_table[0x0F] = &hfp_divide_exception;
751 pgm_check_table[0x10] = &do_dat_exception;
752 pgm_check_table[0x11] = &do_dat_exception;
753 pgm_check_table[0x12] = &translation_exception;
754 pgm_check_table[0x13] = &special_op_exception;
755 #ifdef CONFIG_64BIT
756 pgm_check_table[0x38] = &do_asce_exception;
757 pgm_check_table[0x39] = &do_dat_exception;
758 pgm_check_table[0x3A] = &do_dat_exception;
759 pgm_check_table[0x3B] = &do_dat_exception;
760 #endif /* CONFIG_64BIT */
761 pgm_check_table[0x15] = &operand_exception;
762 pgm_check_table[0x1C] = &space_switch_exception;
763 pgm_check_table[0x1D] = &hfp_sqrt_exception;
764 pfault_irq_init();
765 }
Linux for Ginger Game Console