summaryrefslogtreecommitdiffstats
path: root/arch/mn10300/kernel/traps.c
blob: 0dfdc500112411333ad61911ac49beb7b2aac31a (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
/* MN10300 Exception handling
 *
 * Copyright (C) 2007 Matsushita Electric Industrial Co., Ltd.
 * Copyright (C) 2007 Red Hat, Inc. All Rights Reserved.
 * Modified by David Howells (dhowells@redhat.com)
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public Licence
 * as published by the Free Software Foundation; either version
 * 2 of the Licence, or (at your option) any later version.
 */
#include <linux/sched.h>
#include <linux/kernel.h>
#include <linux/string.h>
#include <linux/errno.h>
#include <linux/ptrace.h>
#include <linux/timer.h>
#include <linux/mm.h>
#include <linux/smp.h>
#include <linux/smp_lock.h>
#include <linux/init.h>
#include <linux/delay.h>
#include <linux/spinlock.h>
#include <linux/interrupt.h>
#include <linux/kallsyms.h>
#include <linux/pci.h>
#include <linux/kdebug.h>
#include <linux/bug.h>
#include <linux/irq.h>
#include <asm/processor.h>
#include <asm/system.h>
#include <asm/uaccess.h>
#include <asm/io.h>
#include <asm/atomic.h>
#include <asm/smp.h>
#include <asm/pgalloc.h>
#include <asm/cacheflush.h>
#include <asm/cpu-regs.h>
#include <asm/busctl-regs.h>
#include <unit/leds.h>
#include <asm/fpu.h>
#include <asm/gdb-stub.h>
#include <asm/sections.h>

#if (CONFIG_INTERRUPT_VECTOR_BASE & 0xffffff)
#error "INTERRUPT_VECTOR_BASE not aligned to 16MiB boundary!"
#endif

struct pt_regs *__frame; /* current frame pointer */
EXPORT_SYMBOL(__frame);

int kstack_depth_to_print = 24;

spinlock_t die_lock = __SPIN_LOCK_UNLOCKED(die_lock);

ATOMIC_NOTIFIER_HEAD(mn10300_die_chain);

/*
 * These constants are for searching for possible module text
 * segments. MODULE_RANGE is a guess of how much space is likely
 * to be vmalloced.
 */
#define MODULE_RANGE (8 * 1024 * 1024)

#define DO_ERROR(signr, prologue, str, name)			\
asmlinkage void name(struct pt_regs *regs, u32 intcode)		\
{								\
	prologue;						\
	if (die_if_no_fixup(str, regs, intcode))		\
		return;						\
	force_sig(signr, current);				\
}

#define DO_EINFO(signr, prologue, str, name, sicode)			\
asmlinkage void name(struct pt_regs *regs, u32 intcode)			\
{									\
	siginfo_t info;							\
	prologue;							\
	if (die_if_no_fixup(str, regs, intcode))			\
		return;							\
	info.si_signo = signr;						\
	if (signr == SIGILL && sicode == ILL_ILLOPC) {			\
		uint8_t opcode;						\
		if (get_user(opcode, (uint8_t __user *)regs->pc) == 0)	\
			if (opcode == 0xff)				\
				info.si_signo = SIGTRAP;		\
	}								\
	info.si_errno = 0;						\
	info.si_code = sicode;						\
	info.si_addr = (void *) regs->pc;				\
	force_sig_info(info.si_signo, &info, current);			\
}

DO_ERROR(SIGTRAP, {}, "trap",			trap);
DO_ERROR(SIGSEGV, {}, "ibreak",			ibreak);
DO_ERROR(SIGSEGV, {}, "obreak",			obreak);
DO_EINFO(SIGSEGV, {}, "access error",		access_error,	SEGV_ACCERR);
DO_EINFO(SIGSEGV, {}, "insn access error",	insn_acc_error,	SEGV_ACCERR);
DO_EINFO(SIGSEGV, {}, "data access error",	data_acc_error,	SEGV_ACCERR);
DO_EINFO(SIGILL,  {}, "privileged opcode",	priv_op,	ILL_PRVOPC);
DO_EINFO(SIGILL,  {}, "invalid opcode",		invalid_op,	ILL_ILLOPC);
DO_EINFO(SIGILL,  {}, "invalid ex opcode",	invalid_exop,	ILL_ILLOPC);
DO_EINFO(SIGBUS,  {}, "invalid address",	mem_error,	BUS_ADRERR);
DO_EINFO(SIGBUS,  {}, "bus error",		bus_error,	BUS_ADRERR);
DO_EINFO(SIGILL,  {}, "FPU invalid opcode", 	fpu_invalid_op,	ILL_COPROC);

DO_ERROR(SIGTRAP,
#ifndef CONFIG_MN10300_USING_JTAG
	 DCR &= ~0x0001,
#else
	 {},
#endif
	 "single step", istep);

/*
 * handle NMI
 */
asmlinkage void nmi(struct pt_regs *regs, enum exception_code code)
{
	/* see if gdbstub wants to deal with it */
#ifdef CONFIG_GDBSTUB
	if (gdbstub_intercept(regs, code))
		return;
#endif

	printk(KERN_WARNING "--- Register Dump ---\n");
	show_registers(regs);
	printk(KERN_WARNING "---------------------\n");
}

/*
 * show a stack trace from the specified stack pointer
 */
void show_trace(unsigned long *sp)
{
	unsigned long *stack, addr, module_start, module_end;
	int i;

	printk(KERN_EMERG "\nCall Trace:");

	stack = sp;
	i = 0;
	module_start = VMALLOC_START;
	module_end = VMALLOC_END;

	while (((long) stack & (THREAD_SIZE - 1)) != 0) {
		addr = *stack++;
		if (__kernel_text_address(addr)) {
#if 1
			printk(" [<%08lx>]", addr);
			print_symbol(" %s", addr);
			printk("\n");
#else
			if ((i % 6) == 0)
				printk(KERN_EMERG "  ");
			printk("[<%08lx>] ", addr);
			i++;
#endif
		}
	}

	printk("\n");
}

/*
 * show the raw stack from the specified stack pointer
 */
void show_stack(struct task_struct *task, unsigned long *sp)
{
	unsigned long *stack;
	int i;

	if (!sp)
		sp = (unsigned long *) &sp;

	stack = sp;
	printk(KERN_EMERG "Stack:");
	for (i = 0; i < kstack_depth_to_print; i++) {
		if (((long) stack & (THREAD_SIZE - 1)) == 0)
			break;
		if ((i % 8) == 0)
			printk(KERN_EMERG "  ");
		printk("%08lx ", *stack++);
	}

	show_trace(sp);
}

/*
 * the architecture-independent dump_stack generator
 */
void dump_stack(void)
{
	unsigned long stack;

	show_stack(current, &stack);
}
EXPORT_SYMBOL(dump_stack);

/*
 * dump the register file in the specified exception frame
 */
void show_registers_only(struct pt_regs *regs)
{
	unsigned long ssp;

	ssp = (unsigned long) regs + sizeof(*regs);

	printk(KERN_EMERG "PC:  %08lx EPSW:  %08lx  SSP: %08lx mode: %s\n",
	       regs->pc, regs->epsw, ssp, user_mode(regs) ? "User" : "Super");
	printk(KERN_EMERG "d0:  %08lx   d1:  %08lx   d2: %08lx   d3: %08lx\n",
	       regs->d0, regs->d1, regs->d2, regs->d3);
	printk(KERN_EMERG "a0:  %08lx   a1:  %08lx   a2: %08lx   a3: %08lx\n",
	       regs->a0, regs->a1, regs->a2, regs->a3);
	printk(KERN_EMERG "e0:  %08lx   e1:  %08lx   e2: %08lx   e3: %08lx\n",
	       regs->e0, regs->e1, regs->e2, regs->e3);
	printk(KERN_EMERG "e4:  %08lx   e5:  %08lx   e6: %08lx   e7: %08lx\n",
	       regs->e4, regs->e5, regs->e6, regs->e7);
	printk(KERN_EMERG "lar: %08lx   lir: %08lx  mdr: %08lx  usp: %08lx\n",
	       regs->lar, regs->lir, regs->mdr, regs->sp);
	printk(KERN_EMERG "cvf: %08lx   crl: %08lx  crh: %08lx  drq: %08lx\n",
	       regs->mcvf, regs->mcrl, regs->mcrh, regs->mdrq);
	printk(KERN_EMERG "threadinfo=%p task=%p)\n",
	       current_thread_info(), current);

	if ((unsigned long) current >= 0x90000000UL &&
	    (unsigned long) current < 0x94000000UL)
		printk(KERN_EMERG "Process %s (pid: %d)\n",
		       current->comm, current->pid);

	printk(KERN_EMERG "CPUP:   %04hx\n", CPUP);
	printk(KERN_EMERG "TBR:    %08x\n", TBR);
	printk(KERN_EMERG "DEAR:   %08x\n", DEAR);
	printk(KERN_EMERG "sISR:   %08x\n", sISR);
	printk(KERN_EMERG "NMICR:  %04hx\n", NMICR);
	printk(KERN_EMERG "BCBERR: %08x\n", BCBERR);
	printk(KERN_EMERG "BCBEAR: %08x\n", BCBEAR);
	printk(KERN_EMERG "MMUFCR: %08x\n", MMUFCR);
	printk(KERN_EMERG "IPTEU : %08x  IPTEL2: %08x\n", IPTEU, IPTEL2);
	printk(KERN_EMERG "DPTEU:  %08x  DPTEL2: %08x\n", DPTEU, DPTEL2);
}

/*
 * dump the registers and the stack
 */
void show_registers(struct pt_regs *regs)
{
	unsigned long sp;
	int i;

	show_registers_only(regs);

	if (!user_mode(regs))
		sp = (unsigned long) regs + sizeof(*regs);
	else
		sp = regs->sp;

	/* when in-kernel, we also print out the stack and code at the
	 * time of the fault..
	 */
	if (!user_mode(regs)) {
		printk(KERN_EMERG "\n");
		show_stack(current, (unsigned long *) sp);

#if 0
		printk(KERN_EMERG "\nCode: ");
		if (regs->pc < PAGE_OFFSET)
			goto bad;

		for (i = 0; i < 20; i++) {
			unsigned char c;
			if (__get_user(c, &((unsigned char *) regs->pc)[i]))
				goto bad;
			printk("%02x ", c);
		}
#else
		i = 0;
#endif
	}

	printk("\n");
	return;

#if 0
bad:
	printk(KERN_EMERG " Bad PC value.");
	break;
#endif
}

/*
 *
 */
void show_trace_task(struct task_struct *tsk)
{
	unsigned long sp = tsk->thread.sp;

	/* User space on another CPU? */
	if ((sp ^ (unsigned long) tsk) & (PAGE_MASK << 1))
		return;

	show_trace((unsigned long *) sp);
}

/*
 * note the untimely death of part of the kernel
 */
void die(const char *str, struct pt_regs *regs, enum exception_code code)
{
	console_verbose();
	spin_lock_irq(&die_lock);
	printk(KERN_EMERG "\n%s: %04x\n",
	       str, code & 0xffff);
	show_registers(regs);

	if (regs->pc >= 0x02000000 && regs->pc < 0x04000000 &&
	    (regs->epsw & (EPSW_IM | EPSW_IE)) != (EPSW_IM | EPSW_IE)) {
		printk(KERN_EMERG "Exception in usermode interrupt handler\n");
		printk(KERN_EMERG "\nPlease connect to kernel debugger !!\n");
		asm volatile ("0: bra 0b");
	}

	spin_unlock_irq(&die_lock);
	do_exit(SIGSEGV);
}

/*
 * see if there's a fixup handler we can force a jump to when an exception
 * happens due to something kernel code did
 */
int die_if_no_fixup(const char *str, struct pt_regs *regs,
		    enum exception_code code)
{
	if (user_mode(regs))
		return 0;

	peripheral_leds_display_exception(code);

	switch (code) {
		/* see if we can fixup the kernel accessing memory */
	case EXCEP_ITLBMISS:
	case EXCEP_DTLBMISS:
	case EXCEP_IAERROR:
	case EXCEP_DAERROR:
	case EXCEP_MEMERR:
	case EXCEP_MISALIGN:
	case EXCEP_BUSERROR:
	case EXCEP_ILLDATACC:
	case EXCEP_IOINSACC:
	case EXCEP_PRIVINSACC:
	case EXCEP_PRIVDATACC:
	case EXCEP_DATINSACC:
		if (fixup_exception(regs))
			return 1;
	case EXCEP_UNIMPINS:
		if (regs->pc && *(uint8_t *)regs->pc == 0xff)
			if (notify_die(DIE_BREAKPOINT, str, regs, code, 0, 0))
				return 1;
		break;
	default:
		break;
	}

	/* see if gdbstub wants to deal with it */
#ifdef CONFIG_GDBSTUB
	if (gdbstub_intercept(regs, code))
		return 1;
#endif

	if (notify_die(DIE_GPF, str, regs, code, 0, 0))
		return 1;

	/* make the process die as the last resort */
	die(str, regs, code);
}

/*
 * handle unsupported syscall instructions (syscall 1-15)
 */
static asmlinkage void unsupported_syscall(struct pt_regs *regs,
					   enum exception_code code)
{
	struct task_struct *tsk = current;
	siginfo_t info;

	/* catch a kernel BUG() */
	if (code == EXCEP_SYSCALL15 && !user_mode(regs)) {
		if (report_bug(regs->pc, regs) == BUG_TRAP_TYPE_BUG) {
#ifdef CONFIG_GDBSTUB
			gdbstub_intercept(regs, code);
#endif
		}
	}

	regs->pc -= 2; /* syscall return addr is _after_ the instruction */

	die_if_no_fixup("An unsupported syscall insn was used by the kernel\n",
			regs, code);

	info.si_signo	= SIGILL;
	info.si_errno	= ENOSYS;
	info.si_code	= ILL_ILLTRP;
	info.si_addr	= (void *) regs->pc;
	force_sig_info(SIGILL, &info, tsk);
}

/*
 * display the register file when the stack pointer gets clobbered
 */
asmlinkage void do_double_fault(struct pt_regs *regs)
{
	struct task_struct *tsk = current;

	strcpy(tsk->comm, "emergency tsk");
	tsk->pid = 0;
	console_verbose();
	printk(KERN_EMERG "--- double fault ---\n");
	show_registers(regs);
}

/*
 * asynchronous bus error (external, usually I/O DMA)
 */
asmlinkage void io_bus_error(u32 bcberr, u32 bcbear, struct pt_regs *regs)
{
	console_verbose();

	printk(KERN_EMERG "Asynchronous I/O Bus Error\n");
	printk(KERN_EMERG "==========================\n");

	if (bcberr & BCBERR_BEME)
		printk(KERN_EMERG "- Multiple recorded errors\n");

	printk(KERN_EMERG "- Faulting Buses:%s%s%s\n",
	       bcberr & BCBERR_BEMR_CI  ? " CPU-Ins-Fetch" : "",
	       bcberr & BCBERR_BEMR_CD  ? " CPU-Data" : "",
	       bcberr & BCBERR_BEMR_DMA ? " DMA" : "");

	printk(KERN_EMERG "- %s %s access made to %s at address %08x\n",
	       bcberr &	BCBERR_BEBST ? "Burst" : "Single",
	       bcberr &	BCBERR_BERW ? "Read" : "Write",
	       bcberr &	BCBERR_BESB_MON  ? "Monitor Space" :
	       bcberr &	BCBERR_BESB_IO   ? "Internal CPU I/O Space" :
	       bcberr &	BCBERR_BESB_EX   ? "External I/O Bus" :
	       bcberr &	BCBERR_BESB_OPEX ? "External Memory Bus" :
	       "On Chip Memory",
	       bcbear
	       );

	printk(KERN_EMERG "- Detected by the %s\n",
	       bcberr&BCBERR_BESD ? "Bus Control Unit" : "Slave Bus");

#ifdef CONFIG_PCI
#define BRIDGEREGB(X) (*(volatile __u8  *)(0xBE040000 + (X)))
#define BRIDGEREGW(X) (*(volatile __u16 *)(0xBE040000 + (X)))
#define BRIDGEREGL(X) (*(volatile __u32 *)(0xBE040000 + (X)))

	printk(KERN_EMERG "- PCI Memory Paging Reg:         %08x\n",
	       *(volatile __u32 *) (0xBFFFFFF4));
	printk(KERN_EMERG "- PCI Bridge Base Address 0:     %08x\n",
	       BRIDGEREGL(PCI_BASE_ADDRESS_0));
	printk(KERN_EMERG "- PCI Bridge AMPCI Base Address: %08x\n",
	       BRIDGEREGL(0x48));
	printk(KERN_EMERG "- PCI Bridge Command:                %04hx\n",
	       BRIDGEREGW(PCI_COMMAND));
	printk(KERN_EMERG "- PCI Bridge Status:                 %04hx\n",
	       BRIDGEREGW(PCI_STATUS));
	printk(KERN_EMERG "- PCI Bridge Int Status:         %08hx\n",
	       BRIDGEREGL(0x4c));
#endif

	printk(KERN_EMERG "\n");
	show_registers(regs);

	panic("Halted due to asynchronous I/O Bus Error\n");
}

/*
 * handle an exception for which a handler has not yet been installed
 */
asmlinkage void uninitialised_exception(struct pt_regs *regs,
					enum exception_code code)
{

	/* see if gdbstub wants to deal with it */
#ifdef CONFIG_GDBSTUB
	if (gdbstub_intercept(regs, code))
		return;
#endif

	peripheral_leds_display_exception(code);
	printk(KERN_EMERG "Uninitialised Exception 0x%04x\n", code & 0xFFFF);
	show_registers(regs);

	for (;;)
		continue;
}

/*
 * set an interrupt stub to jump to a handler
 * ! NOTE: this does *not* flush the caches
 */
void __init __set_intr_stub(enum exception_code code, void *handler)
{
	unsigned long addr;
	u8 *vector = (u8 *)(CONFIG_INTERRUPT_VECTOR_BASE + code);

	addr = (unsigned long) handler - (unsigned long) vector;
	vector[0] = 0xdc;		/* JMP handler */
	vector[1] = addr;
	vector[2] = addr >> 8;
	vector[3] = addr >> 16;
	vector[4] = addr >> 24;
	vector[5] = 0xcb;
	vector[6] = 0xcb;
	vector[7] = 0xcb;
}

/*
 * set an interrupt stub to jump to a handler
 */
void __init set_intr_stub(enum exception_code code, void *handler)
{
	unsigned long addr;
	u8 *vector = (u8 *)(CONFIG_INTERRUPT_VECTOR_BASE + code);

	addr = (unsigned long) handler - (unsigned long) vector;
	vector[0] = 0xdc;		/* JMP handler */
	vector[1] = addr;
	vector[2] = addr >> 8;
	vector[3] = addr >> 16;
	vector[4] = addr >> 24;
	vector[5] = 0xcb;
	vector[6] = 0xcb;
	vector[7] = 0xcb;

	mn10300_dcache_flush_inv();
	mn10300_icache_inv();
}

/*
 * set an interrupt stub to invoke the JTAG unit and then jump to a handler
 */
void __init set_jtag_stub(enum exception_code code, void *handler)
{
	unsigned long addr;
	u8 *vector = (u8 *)(CONFIG_INTERRUPT_VECTOR_BASE + code);

	addr = (unsigned long) handler - ((unsigned long) vector + 1);
	vector[0] = 0xff;		/* PI to jump into JTAG debugger */
	vector[1] = 0xdc;		/* jmp handler */
	vector[2] = addr;
	vector[3] = addr >> 8;
	vector[4] = addr >> 16;
	vector[5] = addr >> 24;
	vector[6] = 0xcb;
	vector[7] = 0xcb;

	mn10300_dcache_flush_inv();
	flush_icache_range((unsigned long) vector, (unsigned long) vector + 8);
}

/*
 * initialise the exception table
 */
void __init trap_init(void)
{
	set_excp_vector(EXCEP_TRAP,		trap);
	set_excp_vector(EXCEP_ISTEP,		istep);
	set_excp_vector(EXCEP_IBREAK,		ibreak);
	set_excp_vector(EXCEP_OBREAK,		obreak);

	set_excp_vector(EXCEP_PRIVINS,		priv_op);
	set_excp_vector(EXCEP_UNIMPINS,		invalid_op);
	set_excp_vector(EXCEP_UNIMPEXINS,	invalid_exop);
	set_excp_vector(EXCEP_MEMERR,		mem_error);
	set_excp_vector(EXCEP_MISALIGN,		misalignment);
	set_excp_vector(EXCEP_BUSERROR,		bus_error);
	set_excp_vector(EXCEP_ILLINSACC,	insn_acc_error);
	set_excp_vector(EXCEP_ILLDATACC,	data_acc_error);
	set_excp_vector(EXCEP_IOINSACC,		insn_acc_error);
	set_excp_vector(EXCEP_PRIVINSACC,	insn_acc_error);
	set_excp_vector(EXCEP_PRIVDATACC,	data_acc_error);
	set_excp_vector(EXCEP_DATINSACC,	insn_acc_error);
	set_excp_vector(EXCEP_FPU_DISABLED,	fpu_disabled);
	set_excp_vector(EXCEP_FPU_UNIMPINS,	fpu_invalid_op);
	set_excp_vector(EXCEP_FPU_OPERATION,	fpu_exception);

	set_excp_vector(EXCEP_NMI,		nmi);

	set_excp_vector(EXCEP_SYSCALL1,		unsupported_syscall);
	set_excp_vector(EXCEP_SYSCALL2,		unsupported_syscall);
	set_excp_vector(EXCEP_SYSCALL3,		unsupported_syscall);
	set_excp_vector(EXCEP_SYSCALL4,		unsupported_syscall);
	set_excp_vector(EXCEP_SYSCALL5,		unsupported_syscall);
	set_excp_vector(EXCEP_SYSCALL6,		unsupported_syscall);
	set_excp_vector(EXCEP_SYSCALL7,		unsupported_syscall);
	set_excp_vector(EXCEP_SYSCALL8,		unsupported_syscall);
	set_excp_vector(EXCEP_SYSCALL9,		unsupported_syscall);
	set_excp_vector(EXCEP_SYSCALL10,	unsupported_syscall);
	set_excp_vector(EXCEP_SYSCALL11,	unsupported_syscall);
	set_excp_vector(EXCEP_SYSCALL12,	unsupported_syscall);
	set_excp_vector(EXCEP_SYSCALL13,	unsupported_syscall);
	set_excp_vector(EXCEP_SYSCALL14,	unsupported_syscall);
	set_excp_vector(EXCEP_SYSCALL15,	unsupported_syscall);
}

/*
 * determine if a program counter value is a valid bug address
 */
int is_valid_bugaddr(unsigned long pc)
{
	return pc >= PAGE_OFFSET;
}
OpenPOWER on IntegriCloud