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[S390] Update maintainers file.
[deliverable/linux.git] / arch / s390 / kernel / traps.c
CommitLineData
1da177e4
LT		 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 */
1da177e4
LT		 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/smp_lock.h>
26#include <linux/init.h>
27#include <linux/interrupt.h>
28#include <linux/delay.h>
29#include <linux/module.h>
30#include <linux/kallsyms.h>
5d3f229f 31#include <linux/reboot.h>
4ba069b8 32#include <linux/kprobes.h>
1da177e4
LT		 33
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>
4ba069b8 43#include <asm/kdebug.h>
1da177e4
LT		 44
45/* Called from entry.S only */
46extern void handle_per_exception(struct pt_regs *regs);
47
48typedef void pgm_check_handler_t(struct pt_regs *, long);
49pgm_check_handler_t *pgm_check_table[128];
50
51#ifdef CONFIG_SYSCTL
52#ifdef CONFIG_PROCESS_DEBUG
53int sysctl_userprocess_debug = 1;
54#else
55int sysctl_userprocess_debug = 0;
56#endif
57#endif
58
59extern pgm_check_handler_t do_protection_exception;
60extern pgm_check_handler_t do_dat_exception;
1da177e4
LT		 61extern pgm_check_handler_t do_monitor_call;
62
63#define stack_pointer ({ void **sp; asm("la %0,0(15)" : "=&d" (sp)); sp; })
64
347a8dc3 65#ifndef CONFIG_64BIT
1da177e4
LT		 66#define FOURLONG "%08lx %08lx %08lx %08lx\n"
67static int kstack_depth_to_print = 12;
347a8dc3 68#else /* CONFIG_64BIT */
1da177e4
LT		 69#define FOURLONG "%016lx %016lx %016lx %016lx\n"
70static int kstack_depth_to_print = 20;
347a8dc3 71#endif /* CONFIG_64BIT */
1da177e4 72
4ba069b8
MG		 73ATOMIC_NOTIFIER_HEAD(s390die_chain);
74
75int register_die_notifier(struct notifier_block *nb)
76{
77 return atomic_notifier_chain_register(&s390die_chain, nb);
78}
79EXPORT_SYMBOL(register_die_notifier);
80
81int unregister_die_notifier(struct notifier_block *nb)
82{
83 return atomic_notifier_chain_unregister(&s390die_chain, nb);
84}
85EXPORT_SYMBOL(unregister_die_notifier);
86
1da177e4
LT		 87/*
88 * For show_trace we have tree different stack to consider:
89 * - the panic stack which is used if the kernel stack has overflown
90 * - the asynchronous interrupt stack (cpu related)
91 * - the synchronous kernel stack (process related)
92 * The stack trace can start at any of the three stack and can potentially
93 * touch all of them. The order is: panic stack, async stack, sync stack.
94 */
95static unsigned long
96__show_trace(unsigned long sp, unsigned long low, unsigned long high)
97{
98 struct stack_frame *sf;
99 struct pt_regs *regs;
100
101 while (1) {
102 sp = sp & PSW_ADDR_INSN;
103 if (sp < low || sp > high - sizeof(*sf))
104 return sp;
105 sf = (struct stack_frame *) sp;
106 printk("([<%016lx>] ", sf->gprs[8] & PSW_ADDR_INSN);
107 print_symbol("%s)\n", sf->gprs[8] & PSW_ADDR_INSN);
108 /* Follow the backchain. */
109 while (1) {
110 low = sp;
111 sp = sf->back_chain & PSW_ADDR_INSN;
112 if (!sp)
113 break;
114 if (sp <= low || sp > high - sizeof(*sf))
115 return sp;
116 sf = (struct stack_frame *) sp;
117 printk(" [<%016lx>] ", sf->gprs[8] & PSW_ADDR_INSN);
118 print_symbol("%s\n", sf->gprs[8] & PSW_ADDR_INSN);
119 }
120 /* Zero backchain detected, check for interrupt frame. */
121 sp = (unsigned long) (sf + 1);
122 if (sp <= low || sp > high - sizeof(*regs))
123 return sp;
124 regs = (struct pt_regs *) sp;
125 printk(" [<%016lx>] ", regs->psw.addr & PSW_ADDR_INSN);
126 print_symbol("%s\n", regs->psw.addr & PSW_ADDR_INSN);
127 low = sp;
128 sp = regs->gprs[15];
129 }
130}
131
236257ee 132void show_trace(struct task_struct *task, unsigned long *stack)
1da177e4
LT		 133{
134 register unsigned long __r15 asm ("15");
135 unsigned long sp;
136
137 sp = (unsigned long) stack;
138 if (!sp)
139 sp = task ? task->thread.ksp : __r15;
140 printk("Call Trace:\n");
141#ifdef CONFIG_CHECK_STACK
142 sp = __show_trace(sp, S390_lowcore.panic_stack - 4096,
143 S390_lowcore.panic_stack);
144#endif
145 sp = __show_trace(sp, S390_lowcore.async_stack - ASYNC_SIZE,
146 S390_lowcore.async_stack);
147 if (task)
30af7120
AV		 148 __show_trace(sp, (unsigned long) task_stack_page(task),
149 (unsigned long) task_stack_page(task) + THREAD_SIZE);
1da177e4
LT		 150 else
151 __show_trace(sp, S390_lowcore.thread_info,
152 S390_lowcore.thread_info + THREAD_SIZE);
153 printk("\n");
236257ee
HC		 154 if (!task)
155 task = current;
156 debug_show_held_locks(task);
1da177e4
LT		 157}
158
159void show_stack(struct task_struct *task, unsigned long *sp)
160{
161 register unsigned long * __r15 asm ("15");
162 unsigned long *stack;
163 int i;
164
1da177e4 165 if (!sp)
73805343
HC		 166 stack = task ? (unsigned long *) task->thread.ksp : __r15;
167 else
168 stack = sp;
1da177e4 169
1da177e4
LT		 170 for (i = 0; i < kstack_depth_to_print; i++) {
171 if (((addr_t) stack & (THREAD_SIZE-1)) == 0)
172 break;
173 if (i && ((i * sizeof (long) % 32) == 0))
174 printk("\n ");
175 printk("%p ", (void *)*stack++);
176 }
177 printk("\n");
178 show_trace(task, sp);
179}
180
181/*
182 * The architecture-independent dump_stack generator
183 */
184void dump_stack(void)
185{
d2c993d8 186 show_stack(NULL, NULL);
1da177e4
LT		 187}
188
189EXPORT_SYMBOL(dump_stack);
190
191void show_registers(struct pt_regs *regs)
192{
193 mm_segment_t old_fs;
194 char *mode;
195 int i;
196
197 mode = (regs->psw.mask & PSW_MASK_PSTATE) ? "User" : "Krnl";
198 printk("%s PSW : %p %p",
199 mode, (void *) regs->psw.mask,
200 (void *) regs->psw.addr);
201 print_symbol(" (%s)\n", regs->psw.addr & PSW_ADDR_INSN);
202 printk("%s GPRS: " FOURLONG, mode,
203 regs->gprs[0], regs->gprs[1], regs->gprs[2], regs->gprs[3]);
204 printk(" " FOURLONG,
205 regs->gprs[4], regs->gprs[5], regs->gprs[6], regs->gprs[7]);
206 printk(" " FOURLONG,
207 regs->gprs[8], regs->gprs[9], regs->gprs[10], regs->gprs[11]);
208 printk(" " FOURLONG,
209 regs->gprs[12], regs->gprs[13], regs->gprs[14], regs->gprs[15]);
210
211#if 0
212 /* FIXME: this isn't needed any more but it changes the ksymoops
213 * input. To remove or not to remove ... */
214 save_access_regs(regs->acrs);
215 printk("%s ACRS: %08x %08x %08x %08x\n", mode,
216 regs->acrs[0], regs->acrs[1], regs->acrs[2], regs->acrs[3]);
217 printk(" %08x %08x %08x %08x\n",
218 regs->acrs[4], regs->acrs[5], regs->acrs[6], regs->acrs[7]);
219 printk(" %08x %08x %08x %08x\n",
220 regs->acrs[8], regs->acrs[9], regs->acrs[10], regs->acrs[11]);
221 printk(" %08x %08x %08x %08x\n",
222 regs->acrs[12], regs->acrs[13], regs->acrs[14], regs->acrs[15]);
223#endif
224
225 /*
226 * Print the first 20 byte of the instruction stream at the
227 * time of the fault.
228 */
229 old_fs = get_fs();
230 if (regs->psw.mask & PSW_MASK_PSTATE)
231 set_fs(USER_DS);
232 else
233 set_fs(KERNEL_DS);
234 printk("%s Code: ", mode);
235 for (i = 0; i < 20; i++) {
236 unsigned char c;
237 if (__get_user(c, (char __user *)(regs->psw.addr + i))) {
238 printk(" Bad PSW.");
239 break;
240 }
241 printk("%02x ", c);
242 }
243 set_fs(old_fs);
244
245 printk("\n");
246}
247
248/* This is called from fs/proc/array.c */
249char *task_show_regs(struct task_struct *task, char *buffer)
250{
251 struct pt_regs *regs;
252
c7584fb6 253 regs = task_pt_regs(task);
1da177e4
LT		 254 buffer += sprintf(buffer, "task: %p, ksp: %p\n",
255 task, (void *)task->thread.ksp);
256 buffer += sprintf(buffer, "User PSW : %p %p\n",
257 (void *) regs->psw.mask, (void *)regs->psw.addr);
258
259 buffer += sprintf(buffer, "User GPRS: " FOURLONG,
260 regs->gprs[0], regs->gprs[1],
261 regs->gprs[2], regs->gprs[3]);
262 buffer += sprintf(buffer, " " FOURLONG,
263 regs->gprs[4], regs->gprs[5],
264 regs->gprs[6], regs->gprs[7]);
265 buffer += sprintf(buffer, " " FOURLONG,
266 regs->gprs[8], regs->gprs[9],
267 regs->gprs[10], regs->gprs[11]);
268 buffer += sprintf(buffer, " " FOURLONG,
269 regs->gprs[12], regs->gprs[13],
270 regs->gprs[14], regs->gprs[15]);
271 buffer += sprintf(buffer, "User ACRS: %08x %08x %08x %08x\n",
272 task->thread.acrs[0], task->thread.acrs[1],
273 task->thread.acrs[2], task->thread.acrs[3]);
274 buffer += sprintf(buffer, " %08x %08x %08x %08x\n",
275 task->thread.acrs[4], task->thread.acrs[5],
276 task->thread.acrs[6], task->thread.acrs[7]);
277 buffer += sprintf(buffer, " %08x %08x %08x %08x\n",
278 task->thread.acrs[8], task->thread.acrs[9],
279 task->thread.acrs[10], task->thread.acrs[11]);
280 buffer += sprintf(buffer, " %08x %08x %08x %08x\n",
281 task->thread.acrs[12], task->thread.acrs[13],
282 task->thread.acrs[14], task->thread.acrs[15]);
283 return buffer;
284}
285
2b67fc46 286static DEFINE_SPINLOCK(die_lock);
1da177e4
LT		 287
288void die(const char * str, struct pt_regs * regs, long err)
289{
290 static int die_counter;
291
292 debug_stop_all();
293 console_verbose();
294 spin_lock_irq(&die_lock);
295 bust_spinlocks(1);
296 printk("%s: %04lx [#%d]\n", str, err & 0xffff, ++die_counter);
297 show_regs(regs);
298 bust_spinlocks(0);
299 spin_unlock_irq(&die_lock);
300 if (in_interrupt())
301 panic("Fatal exception in interrupt");
302 if (panic_on_oops)
303 panic("Fatal exception: panic_on_oops");
304 do_exit(SIGSEGV);
305}
306
307static void inline
308report_user_fault(long interruption_code, struct pt_regs *regs)
309{
310#if defined(CONFIG_SYSCTL)
311 if (!sysctl_userprocess_debug)
312 return;
313#endif
314#if defined(CONFIG_SYSCTL) || defined(CONFIG_PROCESS_DEBUG)
315 printk("User process fault: interruption code 0x%lX\n",
316 interruption_code);
317 show_regs(regs);
318#endif
319}
320
4ba069b8
MG		 321static void __kprobes inline do_trap(long interruption_code, int signr,
322 char *str, struct pt_regs *regs,
323 siginfo_t *info)
1da177e4
LT		 324{
325 /*
326 * We got all needed information from the lowcore and can
327 * now safely switch on interrupts.
328 */
329 if (regs->psw.mask & PSW_MASK_PSTATE)
330 local_irq_enable();
331
4ba069b8
MG		 332 if (notify_die(DIE_TRAP, str, regs, interruption_code,
333 interruption_code, signr) == NOTIFY_STOP)
334 return;
335
1da177e4
LT		 336 if (regs->psw.mask & PSW_MASK_PSTATE) {
337 struct task_struct *tsk = current;
338
339 tsk->thread.trap_no = interruption_code & 0xffff;
340 force_sig_info(signr, info, tsk);
341 report_user_fault(interruption_code, regs);
342 } else {
343 const struct exception_table_entry *fixup;
344 fixup = search_exception_tables(regs->psw.addr & PSW_ADDR_INSN);
345 if (fixup)
346 regs->psw.addr = fixup->fixup | PSW_ADDR_AMODE;
347 else
348 die(str, regs, interruption_code);
349 }
350}
351
d2c993d8 352static inline void __user *get_check_address(struct pt_regs *regs)
1da177e4 353{
d2c993d8 354 return (void __user *)((regs->psw.addr-S390_lowcore.pgm_ilc) & PSW_ADDR_INSN);
1da177e4
LT		 355}
356
4ba069b8 357void __kprobes do_single_step(struct pt_regs *regs)
1da177e4 358{
4ba069b8
MG		 359 if (notify_die(DIE_SSTEP, "sstep", regs, 0, 0,
360 SIGTRAP) == NOTIFY_STOP){
361 return;
362 }
1da177e4
LT		 363 if ((current->ptrace & PT_PTRACED) != 0)
364 force_sig(SIGTRAP, current);
365}
366
2b67fc46 367static void default_trap_handler(struct pt_regs * regs, long interruption_code)
1da177e4
LT		 368{
369 if (regs->psw.mask & PSW_MASK_PSTATE) {
370 local_irq_enable();
371 do_exit(SIGSEGV);
372 report_user_fault(interruption_code, regs);
373 } else
374 die("Unknown program exception", regs, interruption_code);
375}
376
377#define DO_ERROR_INFO(signr, str, name, sicode, siaddr) \
2b67fc46 378static void name(struct pt_regs * regs, long interruption_code) \
1da177e4
LT		 379{ \
380 siginfo_t info; \
381 info.si_signo = signr; \
382 info.si_errno = 0; \
383 info.si_code = sicode; \
d2c993d8 384 info.si_addr = siaddr; \
1da177e4
LT		 385 do_trap(interruption_code, signr, str, regs, &info); \
386}
387
388DO_ERROR_INFO(SIGILL, "addressing exception", addressing_exception,
389 ILL_ILLADR, get_check_address(regs))
390DO_ERROR_INFO(SIGILL, "execute exception", execute_exception,
391 ILL_ILLOPN, get_check_address(regs))
392DO_ERROR_INFO(SIGFPE, "fixpoint divide exception", divide_exception,
393 FPE_INTDIV, get_check_address(regs))
394DO_ERROR_INFO(SIGFPE, "fixpoint overflow exception", overflow_exception,
395 FPE_INTOVF, get_check_address(regs))
396DO_ERROR_INFO(SIGFPE, "HFP overflow exception", hfp_overflow_exception,
397 FPE_FLTOVF, get_check_address(regs))
398DO_ERROR_INFO(SIGFPE, "HFP underflow exception", hfp_underflow_exception,
399 FPE_FLTUND, get_check_address(regs))
400DO_ERROR_INFO(SIGFPE, "HFP significance exception", hfp_significance_exception,
401 FPE_FLTRES, get_check_address(regs))
402DO_ERROR_INFO(SIGFPE, "HFP divide exception", hfp_divide_exception,
403 FPE_FLTDIV, get_check_address(regs))
404DO_ERROR_INFO(SIGFPE, "HFP square root exception", hfp_sqrt_exception,
405 FPE_FLTINV, get_check_address(regs))
406DO_ERROR_INFO(SIGILL, "operand exception", operand_exception,
407 ILL_ILLOPN, get_check_address(regs))
408DO_ERROR_INFO(SIGILL, "privileged operation", privileged_op,
409 ILL_PRVOPC, get_check_address(regs))
410DO_ERROR_INFO(SIGILL, "special operation exception", special_op_exception,
411 ILL_ILLOPN, get_check_address(regs))
412DO_ERROR_INFO(SIGILL, "translation exception", translation_exception,
413 ILL_ILLOPN, get_check_address(regs))
414
415static inline void
d2c993d8 416do_fp_trap(struct pt_regs *regs, void __user *location,
1da177e4
LT		 417 int fpc, long interruption_code)
418{
419 siginfo_t si;
420
421 si.si_signo = SIGFPE;
422 si.si_errno = 0;
423 si.si_addr = location;
424 si.si_code = 0;
425 /* FPC[2] is Data Exception Code */
426 if ((fpc & 0x00000300) == 0) {
427 /* bits 6 and 7 of DXC are 0 iff IEEE exception */
428 if (fpc & 0x8000) /* invalid fp operation */
429 si.si_code = FPE_FLTINV;
430 else if (fpc & 0x4000) /* div by 0 */
431 si.si_code = FPE_FLTDIV;
432 else if (fpc & 0x2000) /* overflow */
433 si.si_code = FPE_FLTOVF;
434 else if (fpc & 0x1000) /* underflow */
435 si.si_code = FPE_FLTUND;
436 else if (fpc & 0x0800) /* inexact */
437 si.si_code = FPE_FLTRES;
438 }
439 current->thread.ieee_instruction_pointer = (addr_t) location;
440 do_trap(interruption_code, SIGFPE,
441 "floating point exception", regs, &si);
442}
443
2b67fc46 444static void illegal_op(struct pt_regs * regs, long interruption_code)
1da177e4
LT		 445{
446 siginfo_t info;
447 __u8 opcode[6];
d2c993d8 448 __u16 __user *location;
1da177e4
LT		 449 int signal = 0;
450
d2c993d8 451 location = get_check_address(regs);
1da177e4
LT		 452
453 /*
454 * We got all needed information from the lowcore and can
455 * now safely switch on interrupts.
456 */
457 if (regs->psw.mask & PSW_MASK_PSTATE)
458 local_irq_enable();
459
460 if (regs->psw.mask & PSW_MASK_PSTATE) {
12bae235
HC		 461 if (get_user(*((__u16 *) opcode), (__u16 __user *) location))
462 return;
1da177e4
LT		 463 if (*((__u16 *) opcode) == S390_BREAKPOINT_U16) {
464 if (current->ptrace & PT_PTRACED)
465 force_sig(SIGTRAP, current);
466 else
467 signal = SIGILL;
468#ifdef CONFIG_MATHEMU
469 } else if (opcode[0] == 0xb3) {
12bae235
HC		 470 if (get_user(*((__u16 *) (opcode+2)), location+1))
471 return;
1da177e4
LT		 472 signal = math_emu_b3(opcode, regs);
473 } else if (opcode[0] == 0xed) {
12bae235
HC		 474 if (get_user(*((__u32 *) (opcode+2)),
475 (__u32 __user *)(location+1)))
476 return;
1da177e4
LT		 477 signal = math_emu_ed(opcode, regs);
478 } else if (*((__u16 *) opcode) == 0xb299) {
12bae235
HC		 479 if (get_user(*((__u16 *) (opcode+2)), location+1))
480 return;
1da177e4
LT		 481 signal = math_emu_srnm(opcode, regs);
482 } else if (*((__u16 *) opcode) == 0xb29c) {
12bae235
HC		 483 if (get_user(*((__u16 *) (opcode+2)), location+1))
484 return;
1da177e4
LT		 485 signal = math_emu_stfpc(opcode, regs);
486 } else if (*((__u16 *) opcode) == 0xb29d) {
12bae235
HC		 487 if (get_user(*((__u16 *) (opcode+2)), location+1))
488 return;
1da177e4
LT		 489 signal = math_emu_lfpc(opcode, regs);
490#endif
491 } else
492 signal = SIGILL;
493 } else
494 signal = SIGILL;
495
496#ifdef CONFIG_MATHEMU
497 if (signal == SIGFPE)
498 do_fp_trap(regs, location,
499 current->thread.fp_regs.fpc, interruption_code);
500 else if (signal == SIGSEGV) {
501 info.si_signo = signal;
502 info.si_errno = 0;
503 info.si_code = SEGV_MAPERR;
5a42b81f 504 info.si_addr = (void __user *) location;
1da177e4
LT		 505 do_trap(interruption_code, signal,
506 "user address fault", regs, &info);
507 } else
508#endif
509 if (signal) {
510 info.si_signo = signal;
511 info.si_errno = 0;
512 info.si_code = ILL_ILLOPC;
793af244 513 info.si_addr = (void __user *) location;
1da177e4
LT		 514 do_trap(interruption_code, signal,
515 "illegal operation", regs, &info);
516 }
517}
518
519
520#ifdef CONFIG_MATHEMU
521asmlinkage void
522specification_exception(struct pt_regs * regs, long interruption_code)
523{
524 __u8 opcode[6];
5a42b81f 525 __u16 __user *location = NULL;
1da177e4
LT		 526 int signal = 0;
527
5a42b81f 528 location = (__u16 __user *) get_check_address(regs);
1da177e4
LT		 529
530 /*
531 * We got all needed information from the lowcore and can
532 * now safely switch on interrupts.
533 */
534 if (regs->psw.mask & PSW_MASK_PSTATE)
535 local_irq_enable();
536
537 if (regs->psw.mask & PSW_MASK_PSTATE) {
538 get_user(*((__u16 *) opcode), location);
539 switch (opcode[0]) {
540 case 0x28: /* LDR Rx,Ry */
541 signal = math_emu_ldr(opcode);
542 break;
543 case 0x38: /* LER Rx,Ry */
544 signal = math_emu_ler(opcode);
545 break;
546 case 0x60: /* STD R,D(X,B) */
547 get_user(*((__u16 *) (opcode+2)), location+1);
548 signal = math_emu_std(opcode, regs);
549 break;
550 case 0x68: /* LD R,D(X,B) */
551 get_user(*((__u16 *) (opcode+2)), location+1);
552 signal = math_emu_ld(opcode, regs);
553 break;
554 case 0x70: /* STE R,D(X,B) */
555 get_user(*((__u16 *) (opcode+2)), location+1);
556 signal = math_emu_ste(opcode, regs);
557 break;
558 case 0x78: /* LE R,D(X,B) */
559 get_user(*((__u16 *) (opcode+2)), location+1);
560 signal = math_emu_le(opcode, regs);
561 break;
562 default:
563 signal = SIGILL;
564 break;
565 }
566 } else
567 signal = SIGILL;
568
569 if (signal == SIGFPE)
570 do_fp_trap(regs, location,
571 current->thread.fp_regs.fpc, interruption_code);
572 else if (signal) {
573 siginfo_t info;
574 info.si_signo = signal;
575 info.si_errno = 0;
576 info.si_code = ILL_ILLOPN;
577 info.si_addr = location;
578 do_trap(interruption_code, signal,
579 "specification exception", regs, &info);
580 }
581}
582#else
583DO_ERROR_INFO(SIGILL, "specification exception", specification_exception,
584 ILL_ILLOPN, get_check_address(regs));
585#endif
586
2b67fc46 587static void data_exception(struct pt_regs * regs, long interruption_code)
1da177e4 588{
d2c993d8 589 __u16 __user *location;
1da177e4
LT		 590 int signal = 0;
591
d2c993d8 592 location = get_check_address(regs);
1da177e4
LT		 593
594 /*
595 * We got all needed information from the lowcore and can
596 * now safely switch on interrupts.
597 */
598 if (regs->psw.mask & PSW_MASK_PSTATE)
599 local_irq_enable();
600
601 if (MACHINE_HAS_IEEE)
94c12cc7 602 asm volatile("stfpc %0" : "=m" (current->thread.fp_regs.fpc));
1da177e4
LT		 603
604#ifdef CONFIG_MATHEMU
605 else if (regs->psw.mask & PSW_MASK_PSTATE) {
606 __u8 opcode[6];
607 get_user(*((__u16 *) opcode), location);
608 switch (opcode[0]) {
609 case 0x28: /* LDR Rx,Ry */
610 signal = math_emu_ldr(opcode);
611 break;
612 case 0x38: /* LER Rx,Ry */
613 signal = math_emu_ler(opcode);
614 break;
615 case 0x60: /* STD R,D(X,B) */
616 get_user(*((__u16 *) (opcode+2)), location+1);
617 signal = math_emu_std(opcode, regs);
618 break;
619 case 0x68: /* LD R,D(X,B) */
620 get_user(*((__u16 *) (opcode+2)), location+1);
621 signal = math_emu_ld(opcode, regs);
622 break;
623 case 0x70: /* STE R,D(X,B) */
624 get_user(*((__u16 *) (opcode+2)), location+1);
625 signal = math_emu_ste(opcode, regs);
626 break;
627 case 0x78: /* LE R,D(X,B) */
628 get_user(*((__u16 *) (opcode+2)), location+1);
629 signal = math_emu_le(opcode, regs);
630 break;
631 case 0xb3:
632 get_user(*((__u16 *) (opcode+2)), location+1);
633 signal = math_emu_b3(opcode, regs);
634 break;
635 case 0xed:
636 get_user(*((__u32 *) (opcode+2)),
5a42b81f 637 (__u32 __user *)(location+1));
1da177e4
LT		 638 signal = math_emu_ed(opcode, regs);
639 break;
640 case 0xb2:
641 if (opcode[1] == 0x99) {
642 get_user(*((__u16 *) (opcode+2)), location+1);
643 signal = math_emu_srnm(opcode, regs);
644 } else if (opcode[1] == 0x9c) {
645 get_user(*((__u16 *) (opcode+2)), location+1);
646 signal = math_emu_stfpc(opcode, regs);
647 } else if (opcode[1] == 0x9d) {
648 get_user(*((__u16 *) (opcode+2)), location+1);
649 signal = math_emu_lfpc(opcode, regs);
650 } else
651 signal = SIGILL;
652 break;
653 default:
654 signal = SIGILL;
655 break;
656 }
657 }
658#endif
659 if (current->thread.fp_regs.fpc & FPC_DXC_MASK)
660 signal = SIGFPE;
661 else
662 signal = SIGILL;
663 if (signal == SIGFPE)
664 do_fp_trap(regs, location,
665 current->thread.fp_regs.fpc, interruption_code);
666 else if (signal) {
667 siginfo_t info;
668 info.si_signo = signal;
669 info.si_errno = 0;
670 info.si_code = ILL_ILLOPN;
671 info.si_addr = location;
672 do_trap(interruption_code, signal,
673 "data exception", regs, &info);
674 }
675}
676
2b67fc46 677static void space_switch_exception(struct pt_regs * regs, long int_code)
1da177e4
LT		 678{
679 siginfo_t info;
680
681 /* Set user psw back to home space mode. */
682 if (regs->psw.mask & PSW_MASK_PSTATE)
683 regs->psw.mask |= PSW_ASC_HOME;
684 /* Send SIGILL. */
685 info.si_signo = SIGILL;
686 info.si_errno = 0;
687 info.si_code = ILL_PRVOPC;
688 info.si_addr = get_check_address(regs);
689 do_trap(int_code, SIGILL, "space switch event", regs, &info);
690}
691
692asmlinkage void kernel_stack_overflow(struct pt_regs * regs)
693{
77eb65cb
HC		 694 bust_spinlocks(1);
695 printk("Kernel stack overflow.\n");
696 show_regs(regs);
697 bust_spinlocks(0);
1da177e4
LT		 698 panic("Corrupt kernel stack, can't continue.");
699}
700
1da177e4
LT		 701/* init is done in lowcore.S and head.S */
702
703void __init trap_init(void)
704{
705 int i;
706
707 for (i = 0; i < 128; i++)
708 pgm_check_table[i] = &default_trap_handler;
709 pgm_check_table[1] = &illegal_op;
710 pgm_check_table[2] = &privileged_op;
711 pgm_check_table[3] = &execute_exception;
712 pgm_check_table[4] = &do_protection_exception;
713 pgm_check_table[5] = &addressing_exception;
714 pgm_check_table[6] = &specification_exception;
715 pgm_check_table[7] = &data_exception;
716 pgm_check_table[8] = &overflow_exception;
717 pgm_check_table[9] = &divide_exception;
718 pgm_check_table[0x0A] = &overflow_exception;
719 pgm_check_table[0x0B] = &divide_exception;
720 pgm_check_table[0x0C] = &hfp_overflow_exception;
721 pgm_check_table[0x0D] = &hfp_underflow_exception;
722 pgm_check_table[0x0E] = &hfp_significance_exception;
723 pgm_check_table[0x0F] = &hfp_divide_exception;
724 pgm_check_table[0x10] = &do_dat_exception;
725 pgm_check_table[0x11] = &do_dat_exception;
726 pgm_check_table[0x12] = &translation_exception;
727 pgm_check_table[0x13] = &special_op_exception;
347a8dc3 728#ifdef CONFIG_64BIT
1da177e4
LT		 729 pgm_check_table[0x38] = &do_dat_exception;
730 pgm_check_table[0x39] = &do_dat_exception;
731 pgm_check_table[0x3A] = &do_dat_exception;
732 pgm_check_table[0x3B] = &do_dat_exception;
347a8dc3 733#endif /* CONFIG_64BIT */
1da177e4
LT		 734 pgm_check_table[0x15] = &operand_exception;
735 pgm_check_table[0x1C] = &space_switch_exception;
736 pgm_check_table[0x1D] = &hfp_sqrt_exception;
737 pgm_check_table[0x40] = &do_monitor_call;
29b08d2b 738 pfault_irq_init();
1da177e4 739}
Linux kernel - Deliverables
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