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-rw-r--r--arch/sh64/kernel/traps.c961
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1/*
2 * This file is subject to the terms and conditions of the GNU General Public
3 * License. See the file "COPYING" in the main directory of this archive
4 * for more details.
5 *
6 * arch/sh64/kernel/traps.c
7 *
8 * Copyright (C) 2000, 2001 Paolo Alberelli
9 * Copyright (C) 2003, 2004 Paul Mundt
10 * Copyright (C) 2003, 2004 Richard Curnow
11 *
12 */
13
14/*
15 * 'Traps.c' handles hardware traps and faults after we have saved some
16 * state in 'entry.S'.
17 */
18#include <linux/sched.h>
19#include <linux/kernel.h>
20#include <linux/string.h>
21#include <linux/errno.h>
22#include <linux/ptrace.h>
23#include <linux/timer.h>
24#include <linux/mm.h>
25#include <linux/smp.h>
26#include <linux/smp_lock.h>
27#include <linux/init.h>
28#include <linux/delay.h>
29#include <linux/spinlock.h>
30#include <linux/kallsyms.h>
31#include <linux/interrupt.h>
32#include <linux/sysctl.h>
33#include <linux/module.h>
34
35#include <asm/system.h>
36#include <asm/uaccess.h>
37#include <asm/io.h>
38#include <asm/atomic.h>
39#include <asm/processor.h>
40#include <asm/pgtable.h>
41
42#undef DEBUG_EXCEPTION
43#ifdef DEBUG_EXCEPTION
44/* implemented in ../lib/dbg.c */
45extern void show_excp_regs(char *fname, int trapnr, int signr,
46 struct pt_regs *regs);
47#else
48#define show_excp_regs(a, b, c, d)
49#endif
50
51static void do_unhandled_exception(int trapnr, int signr, char *str, char *fn_name,
52 unsigned long error_code, struct pt_regs *regs, struct task_struct *tsk);
53
54#define DO_ERROR(trapnr, signr, str, name, tsk) \
55asmlinkage void do_##name(unsigned long error_code, struct pt_regs *regs) \
56{ \
57 do_unhandled_exception(trapnr, signr, str, __stringify(name), error_code, regs, current); \
58}
59
60spinlock_t die_lock;
61
62void die(const char * str, struct pt_regs * regs, long err)
63{
64 console_verbose();
65 spin_lock_irq(&die_lock);
66 printk("%s: %lx\n", str, (err & 0xffffff));
67 show_regs(regs);
68 spin_unlock_irq(&die_lock);
69 do_exit(SIGSEGV);
70}
71
72static inline void die_if_kernel(const char * str, struct pt_regs * regs, long err)
73{
74 if (!user_mode(regs))
75 die(str, regs, err);
76}
77
78static void die_if_no_fixup(const char * str, struct pt_regs * regs, long err)
79{
80 if (!user_mode(regs)) {
81 const struct exception_table_entry *fixup;
82 fixup = search_exception_tables(regs->pc);
83 if (fixup) {
84 regs->pc = fixup->fixup;
85 return;
86 }
87 die(str, regs, err);
88 }
89}
90
91DO_ERROR(13, SIGILL, "illegal slot instruction", illegal_slot_inst, current)
92DO_ERROR(87, SIGSEGV, "address error (exec)", address_error_exec, current)
93
94
95/* Implement misaligned load/store handling for kernel (and optionally for user
96 mode too). Limitation : only SHmedia mode code is handled - there is no
97 handling at all for misaligned accesses occurring in SHcompact code yet. */
98
99static int misaligned_fixup(struct pt_regs *regs);
100
101asmlinkage void do_address_error_load(unsigned long error_code, struct pt_regs *regs)
102{
103 if (misaligned_fixup(regs) < 0) {
104 do_unhandled_exception(7, SIGSEGV, "address error(load)",
105 "do_address_error_load",
106 error_code, regs, current);
107 }
108 return;
109}
110
111asmlinkage void do_address_error_store(unsigned long error_code, struct pt_regs *regs)
112{
113 if (misaligned_fixup(regs) < 0) {
114 do_unhandled_exception(8, SIGSEGV, "address error(store)",
115 "do_address_error_store",
116 error_code, regs, current);
117 }
118 return;
119}
120
121#if defined(CONFIG_SH64_ID2815_WORKAROUND)
122
123#define OPCODE_INVALID 0
124#define OPCODE_USER_VALID 1
125#define OPCODE_PRIV_VALID 2
126
127/* getcon/putcon - requires checking which control register is referenced. */
128#define OPCODE_CTRL_REG 3
129
130/* Table of valid opcodes for SHmedia mode.
131 Form a 10-bit value by concatenating the major/minor opcodes i.e.
132 opcode[31:26,20:16]. The 6 MSBs of this value index into the following
133 array. The 4 LSBs select the bit-pair in the entry (bits 1:0 correspond to
134 LSBs==4'b0000 etc). */
135static unsigned long shmedia_opcode_table[64] = {
136 0x55554044,0x54445055,0x15141514,0x14541414,0x00000000,0x10001000,0x01110055,0x04050015,
137 0x00000444,0xc0000000,0x44545515,0x40405555,0x55550015,0x10005555,0x55555505,0x04050000,
138 0x00000555,0x00000404,0x00040445,0x15151414,0x00000000,0x00000000,0x00000000,0x00000000,
139 0x00000055,0x40404444,0x00000404,0xc0009495,0x00000000,0x00000000,0x00000000,0x00000000,
140 0x55555555,0x55555555,0x55555555,0x55555555,0x55555555,0x55555555,0x55555555,0x55555555,
141 0x55555555,0x55555555,0x55555555,0x55555555,0x55555555,0x55555555,0x55555555,0x55555555,
142 0x80005050,0x04005055,0x55555555,0x55555555,0x55555555,0x55555555,0x55555555,0x55555555,
143 0x81055554,0x00000404,0x55555555,0x55555555,0x00000000,0x00000000,0x00000000,0x00000000
144};
145
146void do_reserved_inst(unsigned long error_code, struct pt_regs *regs)
147{
148 /* Workaround SH5-101 cut2 silicon defect #2815 :
149 in some situations, inter-mode branches from SHcompact -> SHmedia
150 which should take ITLBMISS or EXECPROT exceptions at the target
151 falsely take RESINST at the target instead. */
152
153 unsigned long opcode = 0x6ff4fff0; /* guaranteed reserved opcode */
154 unsigned long pc, aligned_pc;
155 int get_user_error;
156 int trapnr = 12;
157 int signr = SIGILL;
158 char *exception_name = "reserved_instruction";
159
160 pc = regs->pc;
161 if ((pc & 3) == 1) {
162 /* SHmedia : check for defect. This requires executable vmas
163 to be readable too. */
164 aligned_pc = pc & ~3;
165 if (!access_ok(VERIFY_READ, aligned_pc, sizeof(unsigned long))) {
166 get_user_error = -EFAULT;
167 } else {
168 get_user_error = __get_user(opcode, (unsigned long *)aligned_pc);
169 }
170 if (get_user_error >= 0) {
171 unsigned long index, shift;
172 unsigned long major, minor, combined;
173 unsigned long reserved_field;
174 reserved_field = opcode & 0xf; /* These bits are currently reserved as zero in all valid opcodes */
175 major = (opcode >> 26) & 0x3f;
176 minor = (opcode >> 16) & 0xf;
177 combined = (major << 4) | minor;
178 index = major;
179 shift = minor << 1;
180 if (reserved_field == 0) {
181 int opcode_state = (shmedia_opcode_table[index] >> shift) & 0x3;
182 switch (opcode_state) {
183 case OPCODE_INVALID:
184 /* Trap. */
185 break;
186 case OPCODE_USER_VALID:
187 /* Restart the instruction : the branch to the instruction will now be from an RTE
188 not from SHcompact so the silicon defect won't be triggered. */
189 return;
190 case OPCODE_PRIV_VALID:
191 if (!user_mode(regs)) {
192 /* Should only ever get here if a module has
193 SHcompact code inside it. If so, the same fix up is needed. */
194 return; /* same reason */
195 }
196 /* Otherwise, user mode trying to execute a privileged instruction -
197 fall through to trap. */
198 break;
199 case OPCODE_CTRL_REG:
200 /* If in privileged mode, return as above. */
201 if (!user_mode(regs)) return;
202 /* In user mode ... */
203 if (combined == 0x9f) { /* GETCON */
204 unsigned long regno = (opcode >> 20) & 0x3f;
205 if (regno >= 62) {
206 return;
207 }
208 /* Otherwise, reserved or privileged control register, => trap */
209 } else if (combined == 0x1bf) { /* PUTCON */
210 unsigned long regno = (opcode >> 4) & 0x3f;
211 if (regno >= 62) {
212 return;
213 }
214 /* Otherwise, reserved or privileged control register, => trap */
215 } else {
216 /* Trap */
217 }
218 break;
219 default:
220 /* Fall through to trap. */
221 break;
222 }
223 }
224 /* fall through to normal resinst processing */
225 } else {
226 /* Error trying to read opcode. This typically means a
227 real fault, not a RESINST any more. So change the
228 codes. */
229 trapnr = 87;
230 exception_name = "address error (exec)";
231 signr = SIGSEGV;
232 }
233 }
234
235 do_unhandled_exception(trapnr, signr, exception_name, "do_reserved_inst", error_code, regs, current);
236}
237
238#else /* CONFIG_SH64_ID2815_WORKAROUND */
239
240/* If the workaround isn't needed, this is just a straightforward reserved
241 instruction */
242DO_ERROR(12, SIGILL, "reserved instruction", reserved_inst, current)
243
244#endif /* CONFIG_SH64_ID2815_WORKAROUND */
245
246
247#include <asm/system.h>
248
249/* Called with interrupts disabled */
250asmlinkage void do_exception_error(unsigned long ex, struct pt_regs *regs)
251{
252 PLS();
253 show_excp_regs(__FUNCTION__, -1, -1, regs);
254 die_if_kernel("exception", regs, ex);
255}
256
257int do_unknown_trapa(unsigned long scId, struct pt_regs *regs)
258{
259 /* Syscall debug */
260 printk("System call ID error: [0x1#args:8 #syscall:16 0x%lx]\n", scId);
261
262 die_if_kernel("unknown trapa", regs, scId);
263
264 return -ENOSYS;
265}
266
267void show_stack(struct task_struct *tsk, unsigned long *sp)
268{
269#ifdef CONFIG_KALLSYMS
270 extern void sh64_unwind(struct pt_regs *regs);
271 struct pt_regs *regs;
272
273 regs = tsk ? tsk->thread.kregs : NULL;
274
275 sh64_unwind(regs);
276#else
277 printk(KERN_ERR "Can't backtrace on sh64 without CONFIG_KALLSYMS\n");
278#endif
279}
280
281void show_task(unsigned long *sp)
282{
283 show_stack(NULL, sp);
284}
285
286void dump_stack(void)
287{
288 show_task(NULL);
289}
290/* Needed by any user of WARN_ON in view of the defn in include/asm-sh/bug.h */
291EXPORT_SYMBOL(dump_stack);
292
293static void do_unhandled_exception(int trapnr, int signr, char *str, char *fn_name,
294 unsigned long error_code, struct pt_regs *regs, struct task_struct *tsk)
295{
296 show_excp_regs(fn_name, trapnr, signr, regs);
297 tsk->thread.error_code = error_code;
298 tsk->thread.trap_no = trapnr;
299
300 if (user_mode(regs))
301 force_sig(signr, tsk);
302
303 die_if_no_fixup(str, regs, error_code);
304}
305
306static int read_opcode(unsigned long long pc, unsigned long *result_opcode, int from_user_mode)
307{
308 int get_user_error;
309 unsigned long aligned_pc;
310 unsigned long opcode;
311
312 if ((pc & 3) == 1) {
313 /* SHmedia */
314 aligned_pc = pc & ~3;
315 if (from_user_mode) {
316 if (!access_ok(VERIFY_READ, aligned_pc, sizeof(unsigned long))) {
317 get_user_error = -EFAULT;
318 } else {
319 get_user_error = __get_user(opcode, (unsigned long *)aligned_pc);
320 *result_opcode = opcode;
321 }
322 return get_user_error;
323 } else {
324 /* If the fault was in the kernel, we can either read
325 * this directly, or if not, we fault.
326 */
327 *result_opcode = *(unsigned long *) aligned_pc;
328 return 0;
329 }
330 } else if ((pc & 1) == 0) {
331 /* SHcompact */
332 /* TODO : provide handling for this. We don't really support
333 user-mode SHcompact yet, and for a kernel fault, this would
334 have to come from a module built for SHcompact. */
335 return -EFAULT;
336 } else {
337 /* misaligned */
338 return -EFAULT;
339 }
340}
341
342static int address_is_sign_extended(__u64 a)
343{
344 __u64 b;
345#if (NEFF == 32)
346 b = (__u64)(__s64)(__s32)(a & 0xffffffffUL);
347 return (b == a) ? 1 : 0;
348#else
349#error "Sign extend check only works for NEFF==32"
350#endif
351}
352
353static int generate_and_check_address(struct pt_regs *regs,
354 __u32 opcode,
355 int displacement_not_indexed,
356 int width_shift,
357 __u64 *address)
358{
359 /* return -1 for fault, 0 for OK */
360
361 __u64 base_address, addr;
362 int basereg;
363
364 basereg = (opcode >> 20) & 0x3f;
365 base_address = regs->regs[basereg];
366 if (displacement_not_indexed) {
367 __s64 displacement;
368 displacement = (opcode >> 10) & 0x3ff;
369 displacement = ((displacement << 54) >> 54); /* sign extend */
370 addr = (__u64)((__s64)base_address + (displacement << width_shift));
371 } else {
372 __u64 offset;
373 int offsetreg;
374 offsetreg = (opcode >> 10) & 0x3f;
375 offset = regs->regs[offsetreg];
376 addr = base_address + offset;
377 }
378
379 /* Check sign extended */
380 if (!address_is_sign_extended(addr)) {
381 return -1;
382 }
383
384#if defined(CONFIG_SH64_USER_MISALIGNED_FIXUP)
385 /* Check accessible. For misaligned access in the kernel, assume the
386 address is always accessible (and if not, just fault when the
387 load/store gets done.) */
388 if (user_mode(regs)) {
389 if (addr >= TASK_SIZE) {
390 return -1;
391 }
392 /* Do access_ok check later - it depends on whether it's a load or a store. */
393 }
394#endif
395
396 *address = addr;
397 return 0;
398}
399
400/* Default value as for sh */
401#if defined(CONFIG_SH64_USER_MISALIGNED_FIXUP)
402static int user_mode_unaligned_fixup_count = 10;
403static int user_mode_unaligned_fixup_enable = 1;
404#endif
405
406static int kernel_mode_unaligned_fixup_count = 32;
407
408static void misaligned_kernel_word_load(__u64 address, int do_sign_extend, __u64 *result)
409{
410 unsigned short x;
411 unsigned char *p, *q;
412 p = (unsigned char *) (int) address;
413 q = (unsigned char *) &x;
414 q[0] = p[0];
415 q[1] = p[1];
416
417 if (do_sign_extend) {
418 *result = (__u64)(__s64) *(short *) &x;
419 } else {
420 *result = (__u64) x;
421 }
422}
423
424static void misaligned_kernel_word_store(__u64 address, __u64 value)
425{
426 unsigned short x;
427 unsigned char *p, *q;
428 p = (unsigned char *) (int) address;
429 q = (unsigned char *) &x;
430
431 x = (__u16) value;
432 p[0] = q[0];
433 p[1] = q[1];
434}
435
436static int misaligned_load(struct pt_regs *regs,
437 __u32 opcode,
438 int displacement_not_indexed,
439 int width_shift,
440 int do_sign_extend)
441{
442 /* Return -1 for a fault, 0 for OK */
443 int error;
444 int destreg;
445 __u64 address;
446
447 error = generate_and_check_address(regs, opcode,
448 displacement_not_indexed, width_shift, &address);
449 if (error < 0) {
450 return error;
451 }
452
453 destreg = (opcode >> 4) & 0x3f;
454#if defined(CONFIG_SH64_USER_MISALIGNED_FIXUP)
455 if (user_mode(regs)) {
456 __u64 buffer;
457
458 if (!access_ok(VERIFY_READ, (unsigned long) address, 1UL<<width_shift)) {
459 return -1;
460 }
461
462 if (__copy_user(&buffer, (const void *)(int)address, (1 << width_shift)) > 0) {
463 return -1; /* fault */
464 }
465 switch (width_shift) {
466 case 1:
467 if (do_sign_extend) {
468 regs->regs[destreg] = (__u64)(__s64) *(__s16 *) &buffer;
469 } else {
470 regs->regs[destreg] = (__u64) *(__u16 *) &buffer;
471 }
472 break;
473 case 2:
474 regs->regs[destreg] = (__u64)(__s64) *(__s32 *) &buffer;
475 break;
476 case 3:
477 regs->regs[destreg] = buffer;
478 break;
479 default:
480 printk("Unexpected width_shift %d in misaligned_load, PC=%08lx\n",
481 width_shift, (unsigned long) regs->pc);
482 break;
483 }
484 } else
485#endif
486 {
487 /* kernel mode - we can take short cuts since if we fault, it's a genuine bug */
488 __u64 lo, hi;
489
490 switch (width_shift) {
491 case 1:
492 misaligned_kernel_word_load(address, do_sign_extend, &regs->regs[destreg]);
493 break;
494 case 2:
495 asm ("ldlo.l %1, 0, %0" : "=r" (lo) : "r" (address));
496 asm ("ldhi.l %1, 3, %0" : "=r" (hi) : "r" (address));
497 regs->regs[destreg] = lo | hi;
498 break;
499 case 3:
500 asm ("ldlo.q %1, 0, %0" : "=r" (lo) : "r" (address));
501 asm ("ldhi.q %1, 7, %0" : "=r" (hi) : "r" (address));
502 regs->regs[destreg] = lo | hi;
503 break;
504
505 default:
506 printk("Unexpected width_shift %d in misaligned_load, PC=%08lx\n",
507 width_shift, (unsigned long) regs->pc);
508 break;
509 }
510 }
511
512 return 0;
513
514}
515
516static int misaligned_store(struct pt_regs *regs,
517 __u32 opcode,
518 int displacement_not_indexed,
519 int width_shift)
520{
521 /* Return -1 for a fault, 0 for OK */
522 int error;
523 int srcreg;
524 __u64 address;
525
526 error = generate_and_check_address(regs, opcode,
527 displacement_not_indexed, width_shift, &address);
528 if (error < 0) {
529 return error;
530 }
531
532 srcreg = (opcode >> 4) & 0x3f;
533#if defined(CONFIG_SH64_USER_MISALIGNED_FIXUP)
534 if (user_mode(regs)) {
535 __u64 buffer;
536
537 if (!access_ok(VERIFY_WRITE, (unsigned long) address, 1UL<<width_shift)) {
538 return -1;
539 }
540
541 switch (width_shift) {
542 case 1:
543 *(__u16 *) &buffer = (__u16) regs->regs[srcreg];
544 break;
545 case 2:
546 *(__u32 *) &buffer = (__u32) regs->regs[srcreg];
547 break;
548 case 3:
549 buffer = regs->regs[srcreg];
550 break;
551 default:
552 printk("Unexpected width_shift %d in misaligned_store, PC=%08lx\n",
553 width_shift, (unsigned long) regs->pc);
554 break;
555 }
556
557 if (__copy_user((void *)(int)address, &buffer, (1 << width_shift)) > 0) {
558 return -1; /* fault */
559 }
560 } else
561#endif
562 {
563 /* kernel mode - we can take short cuts since if we fault, it's a genuine bug */
564 __u64 val = regs->regs[srcreg];
565
566 switch (width_shift) {
567 case 1:
568 misaligned_kernel_word_store(address, val);
569 break;
570 case 2:
571 asm ("stlo.l %1, 0, %0" : : "r" (val), "r" (address));
572 asm ("sthi.l %1, 3, %0" : : "r" (val), "r" (address));
573 break;
574 case 3:
575 asm ("stlo.q %1, 0, %0" : : "r" (val), "r" (address));
576 asm ("sthi.q %1, 7, %0" : : "r" (val), "r" (address));
577 break;
578
579 default:
580 printk("Unexpected width_shift %d in misaligned_store, PC=%08lx\n",
581 width_shift, (unsigned long) regs->pc);
582 break;
583 }
584 }
585
586 return 0;
587
588}
589
590#if defined(CONFIG_SH64_USER_MISALIGNED_FIXUP)
591/* Never need to fix up misaligned FPU accesses within the kernel since that's a real
592 error. */
593static int misaligned_fpu_load(struct pt_regs *regs,
594 __u32 opcode,
595 int displacement_not_indexed,
596 int width_shift,
597 int do_paired_load)
598{
599 /* Return -1 for a fault, 0 for OK */
600 int error;
601 int destreg;
602 __u64 address;
603
604 error = generate_and_check_address(regs, opcode,
605 displacement_not_indexed, width_shift, &address);
606 if (error < 0) {
607 return error;
608 }
609
610 destreg = (opcode >> 4) & 0x3f;
611 if (user_mode(regs)) {
612 __u64 buffer;
613 __u32 buflo, bufhi;
614
615 if (!access_ok(VERIFY_READ, (unsigned long) address, 1UL<<width_shift)) {
616 return -1;
617 }
618
619 if (__copy_user(&buffer, (const void *)(int)address, (1 << width_shift)) > 0) {
620 return -1; /* fault */
621 }
622 /* 'current' may be the current owner of the FPU state, so
623 context switch the registers into memory so they can be
624 indexed by register number. */
625 if (last_task_used_math == current) {
626 grab_fpu();
627 fpsave(&current->thread.fpu.hard);
628 release_fpu();
629 last_task_used_math = NULL;
630 regs->sr |= SR_FD;
631 }
632
633 buflo = *(__u32*) &buffer;
634 bufhi = *(1 + (__u32*) &buffer);
635
636 switch (width_shift) {
637 case 2:
638 current->thread.fpu.hard.fp_regs[destreg] = buflo;
639 break;
640 case 3:
641 if (do_paired_load) {
642 current->thread.fpu.hard.fp_regs[destreg] = buflo;
643 current->thread.fpu.hard.fp_regs[destreg+1] = bufhi;
644 } else {
645#if defined(CONFIG_LITTLE_ENDIAN)
646 current->thread.fpu.hard.fp_regs[destreg] = bufhi;
647 current->thread.fpu.hard.fp_regs[destreg+1] = buflo;
648#else
649 current->thread.fpu.hard.fp_regs[destreg] = buflo;
650 current->thread.fpu.hard.fp_regs[destreg+1] = bufhi;
651#endif
652 }
653 break;
654 default:
655 printk("Unexpected width_shift %d in misaligned_fpu_load, PC=%08lx\n",
656 width_shift, (unsigned long) regs->pc);
657 break;
658 }
659 return 0;
660 } else {
661 die ("Misaligned FPU load inside kernel", regs, 0);
662 return -1;
663 }
664
665
666}
667
668static int misaligned_fpu_store(struct pt_regs *regs,
669 __u32 opcode,
670 int displacement_not_indexed,
671 int width_shift,
672 int do_paired_load)
673{
674 /* Return -1 for a fault, 0 for OK */
675 int error;
676 int srcreg;
677 __u64 address;
678
679 error = generate_and_check_address(regs, opcode,
680 displacement_not_indexed, width_shift, &address);
681 if (error < 0) {
682 return error;
683 }
684
685 srcreg = (opcode >> 4) & 0x3f;
686 if (user_mode(regs)) {
687 __u64 buffer;
688 /* Initialise these to NaNs. */
689 __u32 buflo=0xffffffffUL, bufhi=0xffffffffUL;
690
691 if (!access_ok(VERIFY_WRITE, (unsigned long) address, 1UL<<width_shift)) {
692 return -1;
693 }
694
695 /* 'current' may be the current owner of the FPU state, so
696 context switch the registers into memory so they can be
697 indexed by register number. */
698 if (last_task_used_math == current) {
699 grab_fpu();
700 fpsave(&current->thread.fpu.hard);
701 release_fpu();
702 last_task_used_math = NULL;
703 regs->sr |= SR_FD;
704 }
705
706 switch (width_shift) {
707 case 2:
708 buflo = current->thread.fpu.hard.fp_regs[srcreg];
709 break;
710 case 3:
711 if (do_paired_load) {
712 buflo = current->thread.fpu.hard.fp_regs[srcreg];
713 bufhi = current->thread.fpu.hard.fp_regs[srcreg+1];
714 } else {
715#if defined(CONFIG_LITTLE_ENDIAN)
716 bufhi = current->thread.fpu.hard.fp_regs[srcreg];
717 buflo = current->thread.fpu.hard.fp_regs[srcreg+1];
718#else
719 buflo = current->thread.fpu.hard.fp_regs[srcreg];
720 bufhi = current->thread.fpu.hard.fp_regs[srcreg+1];
721#endif
722 }
723 break;
724 default:
725 printk("Unexpected width_shift %d in misaligned_fpu_store, PC=%08lx\n",
726 width_shift, (unsigned long) regs->pc);
727 break;
728 }
729
730 *(__u32*) &buffer = buflo;
731 *(1 + (__u32*) &buffer) = bufhi;
732 if (__copy_user((void *)(int)address, &buffer, (1 << width_shift)) > 0) {
733 return -1; /* fault */
734 }
735 return 0;
736 } else {
737 die ("Misaligned FPU load inside kernel", regs, 0);
738 return -1;
739 }
740}
741#endif
742
743static int misaligned_fixup(struct pt_regs *regs)
744{
745 unsigned long opcode;
746 int error;
747 int major, minor;
748
749#if !defined(CONFIG_SH64_USER_MISALIGNED_FIXUP)
750 /* Never fixup user mode misaligned accesses without this option enabled. */
751 return -1;
752#else
753 if (!user_mode_unaligned_fixup_enable) return -1;
754#endif
755
756 error = read_opcode(regs->pc, &opcode, user_mode(regs));
757 if (error < 0) {
758 return error;
759 }
760 major = (opcode >> 26) & 0x3f;
761 minor = (opcode >> 16) & 0xf;
762
763#if defined(CONFIG_SH64_USER_MISALIGNED_FIXUP)
764 if (user_mode(regs) && (user_mode_unaligned_fixup_count > 0)) {
765 --user_mode_unaligned_fixup_count;
766 /* Only do 'count' worth of these reports, to remove a potential DoS against syslog */
767 printk("Fixing up unaligned userspace access in \"%s\" pid=%d pc=0x%08x ins=0x%08lx\n",
768 current->comm, current->pid, (__u32)regs->pc, opcode);
769 } else
770#endif
771 if (!user_mode(regs) && (kernel_mode_unaligned_fixup_count > 0)) {
772 --kernel_mode_unaligned_fixup_count;
773 if (in_interrupt()) {
774 printk("Fixing up unaligned kernelspace access in interrupt pc=0x%08x ins=0x%08lx\n",
775 (__u32)regs->pc, opcode);
776 } else {
777 printk("Fixing up unaligned kernelspace access in \"%s\" pid=%d pc=0x%08x ins=0x%08lx\n",
778 current->comm, current->pid, (__u32)regs->pc, opcode);
779 }
780 }
781
782
783 switch (major) {
784 case (0x84>>2): /* LD.W */
785 error = misaligned_load(regs, opcode, 1, 1, 1);
786 break;
787 case (0xb0>>2): /* LD.UW */
788 error = misaligned_load(regs, opcode, 1, 1, 0);
789 break;
790 case (0x88>>2): /* LD.L */
791 error = misaligned_load(regs, opcode, 1, 2, 1);
792 break;
793 case (0x8c>>2): /* LD.Q */
794 error = misaligned_load(regs, opcode, 1, 3, 0);
795 break;
796
797 case (0xa4>>2): /* ST.W */
798 error = misaligned_store(regs, opcode, 1, 1);
799 break;
800 case (0xa8>>2): /* ST.L */
801 error = misaligned_store(regs, opcode, 1, 2);
802 break;
803 case (0xac>>2): /* ST.Q */
804 error = misaligned_store(regs, opcode, 1, 3);
805 break;
806
807 case (0x40>>2): /* indexed loads */
808 switch (minor) {
809 case 0x1: /* LDX.W */
810 error = misaligned_load(regs, opcode, 0, 1, 1);
811 break;
812 case 0x5: /* LDX.UW */
813 error = misaligned_load(regs, opcode, 0, 1, 0);
814 break;
815 case 0x2: /* LDX.L */
816 error = misaligned_load(regs, opcode, 0, 2, 1);
817 break;
818 case 0x3: /* LDX.Q */
819 error = misaligned_load(regs, opcode, 0, 3, 0);
820 break;
821 default:
822 error = -1;
823 break;
824 }
825 break;
826
827 case (0x60>>2): /* indexed stores */
828 switch (minor) {
829 case 0x1: /* STX.W */
830 error = misaligned_store(regs, opcode, 0, 1);
831 break;
832 case 0x2: /* STX.L */
833 error = misaligned_store(regs, opcode, 0, 2);
834 break;
835 case 0x3: /* STX.Q */
836 error = misaligned_store(regs, opcode, 0, 3);
837 break;
838 default:
839 error = -1;
840 break;
841 }
842 break;
843
844#if defined(CONFIG_SH64_USER_MISALIGNED_FIXUP)
845 case (0x94>>2): /* FLD.S */
846 error = misaligned_fpu_load(regs, opcode, 1, 2, 0);
847 break;
848 case (0x98>>2): /* FLD.P */
849 error = misaligned_fpu_load(regs, opcode, 1, 3, 1);
850 break;
851 case (0x9c>>2): /* FLD.D */
852 error = misaligned_fpu_load(regs, opcode, 1, 3, 0);
853 break;
854 case (0x1c>>2): /* floating indexed loads */
855 switch (minor) {
856 case 0x8: /* FLDX.S */
857 error = misaligned_fpu_load(regs, opcode, 0, 2, 0);
858 break;
859 case 0xd: /* FLDX.P */
860 error = misaligned_fpu_load(regs, opcode, 0, 3, 1);
861 break;
862 case 0x9: /* FLDX.D */
863 error = misaligned_fpu_load(regs, opcode, 0, 3, 0);
864 break;
865 default:
866 error = -1;
867 break;
868 }
869 break;
870 case (0xb4>>2): /* FLD.S */
871 error = misaligned_fpu_store(regs, opcode, 1, 2, 0);
872 break;
873 case (0xb8>>2): /* FLD.P */
874 error = misaligned_fpu_store(regs, opcode, 1, 3, 1);
875 break;
876 case (0xbc>>2): /* FLD.D */
877 error = misaligned_fpu_store(regs, opcode, 1, 3, 0);
878 break;
879 case (0x3c>>2): /* floating indexed stores */
880 switch (minor) {
881 case 0x8: /* FSTX.S */
882 error = misaligned_fpu_store(regs, opcode, 0, 2, 0);
883 break;
884 case 0xd: /* FSTX.P */
885 error = misaligned_fpu_store(regs, opcode, 0, 3, 1);
886 break;
887 case 0x9: /* FSTX.D */
888 error = misaligned_fpu_store(regs, opcode, 0, 3, 0);
889 break;
890 default:
891 error = -1;
892 break;
893 }
894 break;
895#endif
896
897 default:
898 /* Fault */
899 error = -1;
900 break;
901 }
902
903 if (error < 0) {
904 return error;
905 } else {
906 regs->pc += 4; /* Skip the instruction that's just been emulated */
907 return 0;
908 }
909
910}
911
912static ctl_table unaligned_table[] = {
913 {1, "kernel_reports", &kernel_mode_unaligned_fixup_count,
914 sizeof(int), 0644, NULL, &proc_dointvec},
915#if defined(CONFIG_SH64_USER_MISALIGNED_FIXUP)
916 {2, "user_reports", &user_mode_unaligned_fixup_count,
917 sizeof(int), 0644, NULL, &proc_dointvec},
918 {3, "user_enable", &user_mode_unaligned_fixup_enable,
919 sizeof(int), 0644, NULL, &proc_dointvec},
920#endif
921 {0}
922};
923
924static ctl_table unaligned_root[] = {
925 {1, "unaligned_fixup", NULL, 0, 0555, unaligned_table},
926 {0}
927};
928
929static ctl_table sh64_root[] = {
930 {1, "sh64", NULL, 0, 0555, unaligned_root},
931 {0}
932};
933static struct ctl_table_header *sysctl_header;
934static int __init init_sysctl(void)
935{
936 sysctl_header = register_sysctl_table(sh64_root, 0);
937 return 0;
938}
939
940__initcall(init_sysctl);
941
942
943asmlinkage void do_debug_interrupt(unsigned long code, struct pt_regs *regs)
944{
945 u64 peek_real_address_q(u64 addr);
946 u64 poke_real_address_q(u64 addr, u64 val);
947 unsigned long long DM_EXP_CAUSE_PHY = 0x0c100010;
948 unsigned long long exp_cause;
949 /* It's not worth ioremapping the debug module registers for the amount
950 of access we make to them - just go direct to their physical
951 addresses. */
952 exp_cause = peek_real_address_q(DM_EXP_CAUSE_PHY);
953 if (exp_cause & ~4) {
954 printk("DM.EXP_CAUSE had unexpected bits set (=%08lx)\n",
955 (unsigned long)(exp_cause & 0xffffffff));
956 }
957 show_state();
958 /* Clear all DEBUGINT causes */
959 poke_real_address_q(DM_EXP_CAUSE_PHY, 0x0);
960}
961
generated by cgit v1.2.2 (git 2.25.0) at 2024-11-25 04:25:44 -0500