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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 * Copyright (c) 2014 Imagination Technologies Ltd.
7 * Author: Leonid Yegoshin <Leonid.Yegoshin@imgtec.com>
8 * Author: Markos Chandras <markos.chandras@imgtec.com>
9 *
10 * MIPS R2 user space instruction emulator for MIPS R6
11 *
12 */
13#include <linux/bug.h>
14#include <linux/compiler.h>
15#include <linux/debugfs.h>
16#include <linux/init.h>
17#include <linux/kernel.h>
18#include <linux/module.h>
19#include <linux/ptrace.h>
20#include <linux/seq_file.h>
21
22#include <asm/asm.h>
23#include <asm/branch.h>
24#include <asm/break.h>
25#include <asm/debug.h>
26#include <asm/fpu.h>
27#include <asm/fpu_emulator.h>
28#include <asm/inst.h>
29#include <asm/mips-r2-to-r6-emul.h>
30#include <asm/local.h>
31#include <asm/ptrace.h>
32#include <asm/uaccess.h>
33
34#ifdef CONFIG_64BIT
35#define ADDIU "daddiu "
36#define INS "dins "
37#define EXT "dext "
38#else
39#define ADDIU "addiu "
40#define INS "ins "
41#define EXT "ext "
42#endif /* CONFIG_64BIT */
43
44#define SB "sb "
45#define LB "lb "
46#define LL "ll "
47#define SC "sc "
48
49DEFINE_PER_CPU(struct mips_r2_emulator_stats, mipsr2emustats);
50DEFINE_PER_CPU(struct mips_r2_emulator_stats, mipsr2bdemustats);
51DEFINE_PER_CPU(struct mips_r2br_emulator_stats, mipsr2bremustats);
52
53extern const unsigned int fpucondbit[8];
54
55#define MIPS_R2_EMUL_TOTAL_PASS 10
56
57int mipsr2_emulation = 0;
58
59static int __init mipsr2emu_enable(char *s)
60{
61 mipsr2_emulation = 1;
62
63 pr_info("MIPS R2-to-R6 Emulator Enabled!");
64
65 return 1;
66}
67__setup("mipsr2emu", mipsr2emu_enable);
68
69/**
70 * mipsr6_emul - Emulate some frequent R2/R5/R6 instructions in delay slot
71 * for performance instead of the traditional way of using a stack trampoline
72 * which is rather slow.
73 * @regs: Process register set
74 * @ir: Instruction
75 */
76static inline int mipsr6_emul(struct pt_regs *regs, u32 ir)
77{
78 switch (MIPSInst_OPCODE(ir)) {
79 case addiu_op:
80 if (MIPSInst_RT(ir))
81 regs->regs[MIPSInst_RT(ir)] =
82 (s32)regs->regs[MIPSInst_RS(ir)] +
83 (s32)MIPSInst_SIMM(ir);
84 return 0;
85 case daddiu_op:
86 if (config_enabled(CONFIG_32BIT))
87 break;
88
89 if (MIPSInst_RT(ir))
90 regs->regs[MIPSInst_RT(ir)] =
91 (s64)regs->regs[MIPSInst_RS(ir)] +
92 (s64)MIPSInst_SIMM(ir);
93 return 0;
94 case lwc1_op:
95 case swc1_op:
96 case cop1_op:
97 case cop1x_op:
98 /* FPU instructions in delay slot */
99 return -SIGFPE;
100 case spec_op:
101 switch (MIPSInst_FUNC(ir)) {
102 case or_op:
103 if (MIPSInst_RD(ir))
104 regs->regs[MIPSInst_RD(ir)] =
105 regs->regs[MIPSInst_RS(ir)] |
106 regs->regs[MIPSInst_RT(ir)];
107 return 0;
108 case sll_op:
109 if (MIPSInst_RS(ir))
110 break;
111
112 if (MIPSInst_RD(ir))
113 regs->regs[MIPSInst_RD(ir)] =
114 (s32)(((u32)regs->regs[MIPSInst_RT(ir)]) <<
115 MIPSInst_FD(ir));
116 return 0;
117 case srl_op:
118 if (MIPSInst_RS(ir))
119 break;
120
121 if (MIPSInst_RD(ir))
122 regs->regs[MIPSInst_RD(ir)] =
123 (s32)(((u32)regs->regs[MIPSInst_RT(ir)]) >>
124 MIPSInst_FD(ir));
125 return 0;
126 case addu_op:
127 if (MIPSInst_FD(ir))
128 break;
129
130 if (MIPSInst_RD(ir))
131 regs->regs[MIPSInst_RD(ir)] =
132 (s32)((u32)regs->regs[MIPSInst_RS(ir)] +
133 (u32)regs->regs[MIPSInst_RT(ir)]);
134 return 0;
135 case subu_op:
136 if (MIPSInst_FD(ir))
137 break;
138
139 if (MIPSInst_RD(ir))
140 regs->regs[MIPSInst_RD(ir)] =
141 (s32)((u32)regs->regs[MIPSInst_RS(ir)] -
142 (u32)regs->regs[MIPSInst_RT(ir)]);
143 return 0;
144 case dsll_op:
145 if (config_enabled(CONFIG_32BIT) || MIPSInst_RS(ir))
146 break;
147
148 if (MIPSInst_RD(ir))
149 regs->regs[MIPSInst_RD(ir)] =
150 (s64)(((u64)regs->regs[MIPSInst_RT(ir)]) <<
151 MIPSInst_FD(ir));
152 return 0;
153 case dsrl_op:
154 if (config_enabled(CONFIG_32BIT) || MIPSInst_RS(ir))
155 break;
156
157 if (MIPSInst_RD(ir))
158 regs->regs[MIPSInst_RD(ir)] =
159 (s64)(((u64)regs->regs[MIPSInst_RT(ir)]) >>
160 MIPSInst_FD(ir));
161 return 0;
162 case daddu_op:
163 if (config_enabled(CONFIG_32BIT) || MIPSInst_FD(ir))
164 break;
165
166 if (MIPSInst_RD(ir))
167 regs->regs[MIPSInst_RD(ir)] =
168 (u64)regs->regs[MIPSInst_RS(ir)] +
169 (u64)regs->regs[MIPSInst_RT(ir)];
170 return 0;
171 case dsubu_op:
172 if (config_enabled(CONFIG_32BIT) || MIPSInst_FD(ir))
173 break;
174
175 if (MIPSInst_RD(ir))
176 regs->regs[MIPSInst_RD(ir)] =
177 (s64)((u64)regs->regs[MIPSInst_RS(ir)] -
178 (u64)regs->regs[MIPSInst_RT(ir)]);
179 return 0;
180 }
181 break;
182 default:
183 pr_debug("No fastpath BD emulation for instruction 0x%08x (op: %02x)\n",
184 ir, MIPSInst_OPCODE(ir));
185 }
186
187 return SIGILL;
188}
189
190/**
191 * movf_func - Emulate a MOVF instruction
192 * @regs: Process register set
193 * @ir: Instruction
194 *
195 * Returns 0 since it always succeeds.
196 */
197static int movf_func(struct pt_regs *regs, u32 ir)
198{
199 u32 csr;
200 u32 cond;
201
202 csr = current->thread.fpu.fcr31;
203 cond = fpucondbit[MIPSInst_RT(ir) >> 2];
204
205 if (((csr & cond) == 0) && MIPSInst_RD(ir))
206 regs->regs[MIPSInst_RD(ir)] = regs->regs[MIPSInst_RS(ir)];
207
208 MIPS_R2_STATS(movs);
209
210 return 0;
211}
212
213/**
214 * movt_func - Emulate a MOVT instruction
215 * @regs: Process register set
216 * @ir: Instruction
217 *
218 * Returns 0 since it always succeeds.
219 */
220static int movt_func(struct pt_regs *regs, u32 ir)
221{
222 u32 csr;
223 u32 cond;
224
225 csr = current->thread.fpu.fcr31;
226 cond = fpucondbit[MIPSInst_RT(ir) >> 2];
227
228 if (((csr & cond) != 0) && MIPSInst_RD(ir))
229 regs->regs[MIPSInst_RD(ir)] = regs->regs[MIPSInst_RS(ir)];
230
231 MIPS_R2_STATS(movs);
232
233 return 0;
234}
235
236/**
237 * jr_func - Emulate a JR instruction.
238 * @pt_regs: Process register set
239 * @ir: Instruction
240 *
241 * Returns SIGILL if JR was in delay slot, SIGEMT if we
242 * can't compute the EPC, SIGSEGV if we can't access the
243 * userland instruction or 0 on success.
244 */
245static int jr_func(struct pt_regs *regs, u32 ir)
246{
247 int err;
248 unsigned long cepc, epc, nepc;
249 u32 nir;
250
251 if (delay_slot(regs))
252 return SIGILL;
253
254 /* EPC after the RI/JR instruction */
255 nepc = regs->cp0_epc;
256 /* Roll back to the reserved R2 JR instruction */
257 regs->cp0_epc -= 4;
258 epc = regs->cp0_epc;
259 err = __compute_return_epc(regs);
260
261 if (err < 0)
262 return SIGEMT;
263
264
265 /* Computed EPC */
266 cepc = regs->cp0_epc;
267
268 /* Get DS instruction */
269 err = __get_user(nir, (u32 __user *)nepc);
270 if (err)
271 return SIGSEGV;
272
273 MIPS_R2BR_STATS(jrs);
274
275 /* If nir == 0(NOP), then nothing else to do */
276 if (nir) {
277 /*
278 * Negative err means FPU instruction in BD-slot,
279 * Zero err means 'BD-slot emulation done'
280 * For anything else we go back to trampoline emulation.
281 */
282 err = mipsr6_emul(regs, nir);
283 if (err > 0) {
284 regs->cp0_epc = nepc;
285 err = mips_dsemul(regs, nir, cepc);
286 if (err == SIGILL)
287 err = SIGEMT;
288 MIPS_R2_STATS(dsemul);
289 }
290 }
291
292 return err;
293}
294
295/**
296 * movz_func - Emulate a MOVZ instruction
297 * @regs: Process register set
298 * @ir: Instruction
299 *
300 * Returns 0 since it always succeeds.
301 */
302static int movz_func(struct pt_regs *regs, u32 ir)
303{
304 if (((regs->regs[MIPSInst_RT(ir)]) == 0) && MIPSInst_RD(ir))
305 regs->regs[MIPSInst_RD(ir)] = regs->regs[MIPSInst_RS(ir)];
306 MIPS_R2_STATS(movs);
307
308 return 0;
309}
310
311/**
312 * movn_func - Emulate a MOVZ instruction
313 * @regs: Process register set
314 * @ir: Instruction
315 *
316 * Returns 0 since it always succeeds.
317 */
318static int movn_func(struct pt_regs *regs, u32 ir)
319{
320 if (((regs->regs[MIPSInst_RT(ir)]) != 0) && MIPSInst_RD(ir))
321 regs->regs[MIPSInst_RD(ir)] = regs->regs[MIPSInst_RS(ir)];
322 MIPS_R2_STATS(movs);
323
324 return 0;
325}
326
327/**
328 * mfhi_func - Emulate a MFHI instruction
329 * @regs: Process register set
330 * @ir: Instruction
331 *
332 * Returns 0 since it always succeeds.
333 */
334static int mfhi_func(struct pt_regs *regs, u32 ir)
335{
336 if (MIPSInst_RD(ir))
337 regs->regs[MIPSInst_RD(ir)] = regs->hi;
338
339 MIPS_R2_STATS(hilo);
340
341 return 0;
342}
343
344/**
345 * mthi_func - Emulate a MTHI instruction
346 * @regs: Process register set
347 * @ir: Instruction
348 *
349 * Returns 0 since it always succeeds.
350 */
351static int mthi_func(struct pt_regs *regs, u32 ir)
352{
353 regs->hi = regs->regs[MIPSInst_RS(ir)];
354
355 MIPS_R2_STATS(hilo);
356
357 return 0;
358}
359
360/**
361 * mflo_func - Emulate a MFLO instruction
362 * @regs: Process register set
363 * @ir: Instruction
364 *
365 * Returns 0 since it always succeeds.
366 */
367static int mflo_func(struct pt_regs *regs, u32 ir)
368{
369 if (MIPSInst_RD(ir))
370 regs->regs[MIPSInst_RD(ir)] = regs->lo;
371
372 MIPS_R2_STATS(hilo);
373
374 return 0;
375}
376
377/**
378 * mtlo_func - Emulate a MTLO instruction
379 * @regs: Process register set
380 * @ir: Instruction
381 *
382 * Returns 0 since it always succeeds.
383 */
384static int mtlo_func(struct pt_regs *regs, u32 ir)
385{
386 regs->lo = regs->regs[MIPSInst_RS(ir)];
387
388 MIPS_R2_STATS(hilo);
389
390 return 0;
391}
392
393/**
394 * mult_func - Emulate a MULT instruction
395 * @regs: Process register set
396 * @ir: Instruction
397 *
398 * Returns 0 since it always succeeds.
399 */
400static int mult_func(struct pt_regs *regs, u32 ir)
401{
402 s64 res;
403 s32 rt, rs;
404
405 rt = regs->regs[MIPSInst_RT(ir)];
406 rs = regs->regs[MIPSInst_RS(ir)];
407 res = (s64)rt * (s64)rs;
408
409 rs = res;
410 regs->lo = (s64)rs;
411 rt = res >> 32;
412 res = (s64)rt;
413 regs->hi = res;
414
415 MIPS_R2_STATS(muls);
416
417 return 0;
418}
419
420/**
421 * multu_func - Emulate a MULTU instruction
422 * @regs: Process register set
423 * @ir: Instruction
424 *
425 * Returns 0 since it always succeeds.
426 */
427static int multu_func(struct pt_regs *regs, u32 ir)
428{
429 u64 res;
430 u32 rt, rs;
431
432 rt = regs->regs[MIPSInst_RT(ir)];
433 rs = regs->regs[MIPSInst_RS(ir)];
434 res = (u64)rt * (u64)rs;
435 rt = res;
436 regs->lo = (s64)rt;
437 regs->hi = (s64)(res >> 32);
438
439 MIPS_R2_STATS(muls);
440
441 return 0;
442}
443
444/**
445 * div_func - Emulate a DIV instruction
446 * @regs: Process register set
447 * @ir: Instruction
448 *
449 * Returns 0 since it always succeeds.
450 */
451static int div_func(struct pt_regs *regs, u32 ir)
452{
453 s32 rt, rs;
454
455 rt = regs->regs[MIPSInst_RT(ir)];
456 rs = regs->regs[MIPSInst_RS(ir)];
457
458 regs->lo = (s64)(rs / rt);
459 regs->hi = (s64)(rs % rt);
460
461 MIPS_R2_STATS(divs);
462
463 return 0;
464}
465
466/**
467 * divu_func - Emulate a DIVU instruction
468 * @regs: Process register set
469 * @ir: Instruction
470 *
471 * Returns 0 since it always succeeds.
472 */
473static int divu_func(struct pt_regs *regs, u32 ir)
474{
475 u32 rt, rs;
476
477 rt = regs->regs[MIPSInst_RT(ir)];
478 rs = regs->regs[MIPSInst_RS(ir)];
479
480 regs->lo = (s64)(rs / rt);
481 regs->hi = (s64)(rs % rt);
482
483 MIPS_R2_STATS(divs);
484
485 return 0;
486}
487
488/**
489 * dmult_func - Emulate a DMULT instruction
490 * @regs: Process register set
491 * @ir: Instruction
492 *
493 * Returns 0 on success or SIGILL for 32-bit kernels.
494 */
495static int dmult_func(struct pt_regs *regs, u32 ir)
496{
497 s64 res;
498 s64 rt, rs;
499
500 if (config_enabled(CONFIG_32BIT))
501 return SIGILL;
502
503 rt = regs->regs[MIPSInst_RT(ir)];
504 rs = regs->regs[MIPSInst_RS(ir)];
505 res = rt * rs;
506
507 regs->lo = res;
508 __asm__ __volatile__(
509 "dmuh %0, %1, %2\t\n"
510 : "=r"(res)
511 : "r"(rt), "r"(rs));
512
513 regs->hi = res;
514
515 MIPS_R2_STATS(muls);
516
517 return 0;
518}
519
520/**
521 * dmultu_func - Emulate a DMULTU instruction
522 * @regs: Process register set
523 * @ir: Instruction
524 *
525 * Returns 0 on success or SIGILL for 32-bit kernels.
526 */
527static int dmultu_func(struct pt_regs *regs, u32 ir)
528{
529 u64 res;
530 u64 rt, rs;
531
532 if (config_enabled(CONFIG_32BIT))
533 return SIGILL;
534
535 rt = regs->regs[MIPSInst_RT(ir)];
536 rs = regs->regs[MIPSInst_RS(ir)];
537 res = rt * rs;
538
539 regs->lo = res;
540 __asm__ __volatile__(
541 "dmuhu %0, %1, %2\t\n"
542 : "=r"(res)
543 : "r"(rt), "r"(rs));
544
545 regs->hi = res;
546
547 MIPS_R2_STATS(muls);
548
549 return 0;
550}
551
552/**
553 * ddiv_func - Emulate a DDIV instruction
554 * @regs: Process register set
555 * @ir: Instruction
556 *
557 * Returns 0 on success or SIGILL for 32-bit kernels.
558 */
559static int ddiv_func(struct pt_regs *regs, u32 ir)
560{
561 s64 rt, rs;
562
563 if (config_enabled(CONFIG_32BIT))
564 return SIGILL;
565
566 rt = regs->regs[MIPSInst_RT(ir)];
567 rs = regs->regs[MIPSInst_RS(ir)];
568
569 regs->lo = rs / rt;
570 regs->hi = rs % rt;
571
572 MIPS_R2_STATS(divs);
573
574 return 0;
575}
576
577/**
578 * ddivu_func - Emulate a DDIVU instruction
579 * @regs: Process register set
580 * @ir: Instruction
581 *
582 * Returns 0 on success or SIGILL for 32-bit kernels.
583 */
584static int ddivu_func(struct pt_regs *regs, u32 ir)
585{
586 u64 rt, rs;
587
588 if (config_enabled(CONFIG_32BIT))
589 return SIGILL;
590
591 rt = regs->regs[MIPSInst_RT(ir)];
592 rs = regs->regs[MIPSInst_RS(ir)];
593
594 regs->lo = rs / rt;
595 regs->hi = rs % rt;
596
597 MIPS_R2_STATS(divs);
598
599 return 0;
600}
601
602/* R6 removed instructions for the SPECIAL opcode */
603static struct r2_decoder_table spec_op_table[] = {
604 { 0xfc1ff83f, 0x00000008, jr_func },
605 { 0xfc00ffff, 0x00000018, mult_func },
606 { 0xfc00ffff, 0x00000019, multu_func },
607 { 0xfc00ffff, 0x0000001c, dmult_func },
608 { 0xfc00ffff, 0x0000001d, dmultu_func },
609 { 0xffff07ff, 0x00000010, mfhi_func },
610 { 0xfc1fffff, 0x00000011, mthi_func },
611 { 0xffff07ff, 0x00000012, mflo_func },
612 { 0xfc1fffff, 0x00000013, mtlo_func },
613 { 0xfc0307ff, 0x00000001, movf_func },
614 { 0xfc0307ff, 0x00010001, movt_func },
615 { 0xfc0007ff, 0x0000000a, movz_func },
616 { 0xfc0007ff, 0x0000000b, movn_func },
617 { 0xfc00ffff, 0x0000001a, div_func },
618 { 0xfc00ffff, 0x0000001b, divu_func },
619 { 0xfc00ffff, 0x0000001e, ddiv_func },
620 { 0xfc00ffff, 0x0000001f, ddivu_func },
621 {}
622};
623
624/**
625 * madd_func - Emulate a MADD instruction
626 * @regs: Process register set
627 * @ir: Instruction
628 *
629 * Returns 0 since it always succeeds.
630 */
631static int madd_func(struct pt_regs *regs, u32 ir)
632{
633 s64 res;
634 s32 rt, rs;
635
636 rt = regs->regs[MIPSInst_RT(ir)];
637 rs = regs->regs[MIPSInst_RS(ir)];
638 res = (s64)rt * (s64)rs;
639 rt = regs->hi;
640 rs = regs->lo;
641 res += ((((s64)rt) << 32) | (u32)rs);
642
643 rt = res;
644 regs->lo = (s64)rt;
645 rs = res >> 32;
646 regs->hi = (s64)rs;
647
648 MIPS_R2_STATS(dsps);
649
650 return 0;
651}
652
653/**
654 * maddu_func - Emulate a MADDU instruction
655 * @regs: Process register set
656 * @ir: Instruction
657 *
658 * Returns 0 since it always succeeds.
659 */
660static int maddu_func(struct pt_regs *regs, u32 ir)
661{
662 u64 res;
663 u32 rt, rs;
664
665 rt = regs->regs[MIPSInst_RT(ir)];
666 rs = regs->regs[MIPSInst_RS(ir)];
667 res = (u64)rt * (u64)rs;
668 rt = regs->hi;
669 rs = regs->lo;
670 res += ((((s64)rt) << 32) | (u32)rs);
671
672 rt = res;
673 regs->lo = (s64)rt;
674 rs = res >> 32;
675 regs->hi = (s64)rs;
676
677 MIPS_R2_STATS(dsps);
678
679 return 0;
680}
681
682/**
683 * msub_func - Emulate a MSUB instruction
684 * @regs: Process register set
685 * @ir: Instruction
686 *
687 * Returns 0 since it always succeeds.
688 */
689static int msub_func(struct pt_regs *regs, u32 ir)
690{
691 s64 res;
692 s32 rt, rs;
693
694 rt = regs->regs[MIPSInst_RT(ir)];
695 rs = regs->regs[MIPSInst_RS(ir)];
696 res = (s64)rt * (s64)rs;
697 rt = regs->hi;
698 rs = regs->lo;
699 res = ((((s64)rt) << 32) | (u32)rs) - res;
700
701 rt = res;
702 regs->lo = (s64)rt;
703 rs = res >> 32;
704 regs->hi = (s64)rs;
705
706 MIPS_R2_STATS(dsps);
707
708 return 0;
709}
710
711/**
712 * msubu_func - Emulate a MSUBU instruction
713 * @regs: Process register set
714 * @ir: Instruction
715 *
716 * Returns 0 since it always succeeds.
717 */
718static int msubu_func(struct pt_regs *regs, u32 ir)
719{
720 u64 res;
721 u32 rt, rs;
722
723 rt = regs->regs[MIPSInst_RT(ir)];
724 rs = regs->regs[MIPSInst_RS(ir)];
725 res = (u64)rt * (u64)rs;
726 rt = regs->hi;
727 rs = regs->lo;
728 res = ((((s64)rt) << 32) | (u32)rs) - res;
729
730 rt = res;
731 regs->lo = (s64)rt;
732 rs = res >> 32;
733 regs->hi = (s64)rs;
734
735 MIPS_R2_STATS(dsps);
736
737 return 0;
738}
739
740/**
741 * mul_func - Emulate a MUL instruction
742 * @regs: Process register set
743 * @ir: Instruction
744 *
745 * Returns 0 since it always succeeds.
746 */
747static int mul_func(struct pt_regs *regs, u32 ir)
748{
749 s64 res;
750 s32 rt, rs;
751
752 if (!MIPSInst_RD(ir))
753 return 0;
754 rt = regs->regs[MIPSInst_RT(ir)];
755 rs = regs->regs[MIPSInst_RS(ir)];
756 res = (s64)rt * (s64)rs;
757
758 rs = res;
759 regs->regs[MIPSInst_RD(ir)] = (s64)rs;
760
761 MIPS_R2_STATS(muls);
762
763 return 0;
764}
765
766/**
767 * clz_func - Emulate a CLZ instruction
768 * @regs: Process register set
769 * @ir: Instruction
770 *
771 * Returns 0 since it always succeeds.
772 */
773static int clz_func(struct pt_regs *regs, u32 ir)
774{
775 u32 res;
776 u32 rs;
777
778 if (!MIPSInst_RD(ir))
779 return 0;
780
781 rs = regs->regs[MIPSInst_RS(ir)];
782 __asm__ __volatile__("clz %0, %1" : "=r"(res) : "r"(rs));
783 regs->regs[MIPSInst_RD(ir)] = res;
784
785 MIPS_R2_STATS(bops);
786
787 return 0;
788}
789
790/**
791 * clo_func - Emulate a CLO instruction
792 * @regs: Process register set
793 * @ir: Instruction
794 *
795 * Returns 0 since it always succeeds.
796 */
797
798static int clo_func(struct pt_regs *regs, u32 ir)
799{
800 u32 res;
801 u32 rs;
802
803 if (!MIPSInst_RD(ir))
804 return 0;
805
806 rs = regs->regs[MIPSInst_RS(ir)];
807 __asm__ __volatile__("clo %0, %1" : "=r"(res) : "r"(rs));
808 regs->regs[MIPSInst_RD(ir)] = res;
809
810 MIPS_R2_STATS(bops);
811
812 return 0;
813}
814
815/**
816 * dclz_func - Emulate a DCLZ instruction
817 * @regs: Process register set
818 * @ir: Instruction
819 *
820 * Returns 0 since it always succeeds.
821 */
822static int dclz_func(struct pt_regs *regs, u32 ir)
823{
824 u64 res;
825 u64 rs;
826
827 if (config_enabled(CONFIG_32BIT))
828 return SIGILL;
829
830 if (!MIPSInst_RD(ir))
831 return 0;
832
833 rs = regs->regs[MIPSInst_RS(ir)];
834 __asm__ __volatile__("dclz %0, %1" : "=r"(res) : "r"(rs));
835 regs->regs[MIPSInst_RD(ir)] = res;
836
837 MIPS_R2_STATS(bops);
838
839 return 0;
840}
841
842/**
843 * dclo_func - Emulate a DCLO instruction
844 * @regs: Process register set
845 * @ir: Instruction
846 *
847 * Returns 0 since it always succeeds.
848 */
849static int dclo_func(struct pt_regs *regs, u32 ir)
850{
851 u64 res;
852 u64 rs;
853
854 if (config_enabled(CONFIG_32BIT))
855 return SIGILL;
856
857 if (!MIPSInst_RD(ir))
858 return 0;
859
860 rs = regs->regs[MIPSInst_RS(ir)];
861 __asm__ __volatile__("dclo %0, %1" : "=r"(res) : "r"(rs));
862 regs->regs[MIPSInst_RD(ir)] = res;
863
864 MIPS_R2_STATS(bops);
865
866 return 0;
867}
868
869/* R6 removed instructions for the SPECIAL2 opcode */
870static struct r2_decoder_table spec2_op_table[] = {
871 { 0xfc00ffff, 0x70000000, madd_func },
872 { 0xfc00ffff, 0x70000001, maddu_func },
873 { 0xfc0007ff, 0x70000002, mul_func },
874 { 0xfc00ffff, 0x70000004, msub_func },
875 { 0xfc00ffff, 0x70000005, msubu_func },
876 { 0xfc0007ff, 0x70000020, clz_func },
877 { 0xfc0007ff, 0x70000021, clo_func },
878 { 0xfc0007ff, 0x70000024, dclz_func },
879 { 0xfc0007ff, 0x70000025, dclo_func },
880 { }
881};
882
883static inline int mipsr2_find_op_func(struct pt_regs *regs, u32 inst,
884 struct r2_decoder_table *table)
885{
886 struct r2_decoder_table *p;
887 int err;
888
889 for (p = table; p->func; p++) {
890 if ((inst & p->mask) == p->code) {
891 err = (p->func)(regs, inst);
892 return err;
893 }
894 }
895 return SIGILL;
896}
897
898/**
899 * mipsr2_decoder: Decode and emulate a MIPS R2 instruction
900 * @regs: Process register set
901 * @inst: Instruction to decode and emulate
902 * @fcr31: Floating Point Control and Status Register returned
903 */
904int mipsr2_decoder(struct pt_regs *regs, u32 inst, unsigned long *fcr31)
905{
906 int err = 0;
907 unsigned long vaddr;
908 u32 nir;
909 unsigned long cpc, epc, nepc, r31, res, rs, rt;
910
911 void __user *fault_addr = NULL;
912 int pass = 0;
913
914repeat:
915 r31 = regs->regs[31];
916 epc = regs->cp0_epc;
917 err = compute_return_epc(regs);
918 if (err < 0) {
919 BUG();
920 return SIGEMT;
921 }
922 pr_debug("Emulating the 0x%08x R2 instruction @ 0x%08lx (pass=%d))\n",
923 inst, epc, pass);
924
925 switch (MIPSInst_OPCODE(inst)) {
926 case spec_op:
927 err = mipsr2_find_op_func(regs, inst, spec_op_table);
928 if (err < 0) {
929 /* FPU instruction under JR */
930 regs->cp0_cause |= CAUSEF_BD;
931 goto fpu_emul;
932 }
933 break;
934 case spec2_op:
935 err = mipsr2_find_op_func(regs, inst, spec2_op_table);
936 break;
937 case bcond_op:
938 rt = MIPSInst_RT(inst);
939 rs = MIPSInst_RS(inst);
940 switch (rt) {
941 case tgei_op:
942 if ((long)regs->regs[rs] >= MIPSInst_SIMM(inst))
943 do_trap_or_bp(regs, 0, 0, "TGEI");
944
945 MIPS_R2_STATS(traps);
946
947 break;
948 case tgeiu_op:
949 if (regs->regs[rs] >= MIPSInst_UIMM(inst))
950 do_trap_or_bp(regs, 0, 0, "TGEIU");
951
952 MIPS_R2_STATS(traps);
953
954 break;
955 case tlti_op:
956 if ((long)regs->regs[rs] < MIPSInst_SIMM(inst))
957 do_trap_or_bp(regs, 0, 0, "TLTI");
958
959 MIPS_R2_STATS(traps);
960
961 break;
962 case tltiu_op:
963 if (regs->regs[rs] < MIPSInst_UIMM(inst))
964 do_trap_or_bp(regs, 0, 0, "TLTIU");
965
966 MIPS_R2_STATS(traps);
967
968 break;
969 case teqi_op:
970 if (regs->regs[rs] == MIPSInst_SIMM(inst))
971 do_trap_or_bp(regs, 0, 0, "TEQI");
972
973 MIPS_R2_STATS(traps);
974
975 break;
976 case tnei_op:
977 if (regs->regs[rs] != MIPSInst_SIMM(inst))
978 do_trap_or_bp(regs, 0, 0, "TNEI");
979
980 MIPS_R2_STATS(traps);
981
982 break;
983 case bltzl_op:
984 case bgezl_op:
985 case bltzall_op:
986 case bgezall_op:
987 if (delay_slot(regs)) {
988 err = SIGILL;
989 break;
990 }
991 regs->regs[31] = r31;
992 regs->cp0_epc = epc;
993 err = __compute_return_epc(regs);
994 if (err < 0)
995 return SIGEMT;
996 if (err != BRANCH_LIKELY_TAKEN)
997 break;
998 cpc = regs->cp0_epc;
999 nepc = epc + 4;
1000 err = __get_user(nir, (u32 __user *)nepc);
1001 if (err) {
1002 err = SIGSEGV;
1003 break;
1004 }
1005 /*
1006 * This will probably be optimized away when
1007 * CONFIG_DEBUG_FS is not enabled
1008 */
1009 switch (rt) {
1010 case bltzl_op:
1011 MIPS_R2BR_STATS(bltzl);
1012 break;
1013 case bgezl_op:
1014 MIPS_R2BR_STATS(bgezl);
1015 break;
1016 case bltzall_op:
1017 MIPS_R2BR_STATS(bltzall);
1018 break;
1019 case bgezall_op:
1020 MIPS_R2BR_STATS(bgezall);
1021 break;
1022 }
1023
1024 switch (MIPSInst_OPCODE(nir)) {
1025 case cop1_op:
1026 case cop1x_op:
1027 case lwc1_op:
1028 case swc1_op:
1029 regs->cp0_cause |= CAUSEF_BD;
1030 goto fpu_emul;
1031 }
1032 if (nir) {
1033 err = mipsr6_emul(regs, nir);
1034 if (err > 0) {
1035 err = mips_dsemul(regs, nir, cpc);
1036 if (err == SIGILL)
1037 err = SIGEMT;
1038 MIPS_R2_STATS(dsemul);
1039 }
1040 }
1041 break;
1042 case bltzal_op:
1043 case bgezal_op:
1044 if (delay_slot(regs)) {
1045 err = SIGILL;
1046 break;
1047 }
1048 regs->regs[31] = r31;
1049 regs->cp0_epc = epc;
1050 err = __compute_return_epc(regs);
1051 if (err < 0)
1052 return SIGEMT;
1053 cpc = regs->cp0_epc;
1054 nepc = epc + 4;
1055 err = __get_user(nir, (u32 __user *)nepc);
1056 if (err) {
1057 err = SIGSEGV;
1058 break;
1059 }
1060 /*
1061 * This will probably be optimized away when
1062 * CONFIG_DEBUG_FS is not enabled
1063 */
1064 switch (rt) {
1065 case bltzal_op:
1066 MIPS_R2BR_STATS(bltzal);
1067 break;
1068 case bgezal_op:
1069 MIPS_R2BR_STATS(bgezal);
1070 break;
1071 }
1072
1073 switch (MIPSInst_OPCODE(nir)) {
1074 case cop1_op:
1075 case cop1x_op:
1076 case lwc1_op:
1077 case swc1_op:
1078 regs->cp0_cause |= CAUSEF_BD;
1079 goto fpu_emul;
1080 }
1081 if (nir) {
1082 err = mipsr6_emul(regs, nir);
1083 if (err > 0) {
1084 err = mips_dsemul(regs, nir, cpc);
1085 if (err == SIGILL)
1086 err = SIGEMT;
1087 MIPS_R2_STATS(dsemul);
1088 }
1089 }
1090 break;
1091 default:
1092 regs->regs[31] = r31;
1093 regs->cp0_epc = epc;
1094 err = SIGILL;
1095 break;
1096 }
1097 break;
1098
1099 case beql_op:
1100 case bnel_op:
1101 case blezl_op:
1102 case bgtzl_op:
1103 if (delay_slot(regs)) {
1104 err = SIGILL;
1105 break;
1106 }
1107 regs->regs[31] = r31;
1108 regs->cp0_epc = epc;
1109 err = __compute_return_epc(regs);
1110 if (err < 0)
1111 return SIGEMT;
1112 if (err != BRANCH_LIKELY_TAKEN)
1113 break;
1114 cpc = regs->cp0_epc;
1115 nepc = epc + 4;
1116 err = __get_user(nir, (u32 __user *)nepc);
1117 if (err) {
1118 err = SIGSEGV;
1119 break;
1120 }
1121 /*
1122 * This will probably be optimized away when
1123 * CONFIG_DEBUG_FS is not enabled
1124 */
1125 switch (MIPSInst_OPCODE(inst)) {
1126 case beql_op:
1127 MIPS_R2BR_STATS(beql);
1128 break;
1129 case bnel_op:
1130 MIPS_R2BR_STATS(bnel);
1131 break;
1132 case blezl_op:
1133 MIPS_R2BR_STATS(blezl);
1134 break;
1135 case bgtzl_op:
1136 MIPS_R2BR_STATS(bgtzl);
1137 break;
1138 }
1139
1140 switch (MIPSInst_OPCODE(nir)) {
1141 case cop1_op:
1142 case cop1x_op:
1143 case lwc1_op:
1144 case swc1_op:
1145 regs->cp0_cause |= CAUSEF_BD;
1146 goto fpu_emul;
1147 }
1148 if (nir) {
1149 err = mipsr6_emul(regs, nir);
1150 if (err > 0) {
1151 err = mips_dsemul(regs, nir, cpc);
1152 if (err == SIGILL)
1153 err = SIGEMT;
1154 MIPS_R2_STATS(dsemul);
1155 }
1156 }
1157 break;
1158 case lwc1_op:
1159 case swc1_op:
1160 case cop1_op:
1161 case cop1x_op:
1162fpu_emul:
1163 regs->regs[31] = r31;
1164 regs->cp0_epc = epc;
1165 if (!used_math()) { /* First time FPU user. */
1166 err = init_fpu();
1167 set_used_math();
1168 }
1169 lose_fpu(1); /* Save FPU state for the emulator. */
1170
1171 err = fpu_emulator_cop1Handler(regs, ¤t->thread.fpu, 0,
1172 &fault_addr);
1173 *fcr31 = current->thread.fpu.fcr31;
1174
1175 /*
1176 * We can't allow the emulated instruction to leave any of
1177 * the cause bits set in $fcr31.
1178 */
1179 current->thread.fpu.fcr31 &= ~FPU_CSR_ALL_X;
1180
1181 /*
1182 * this is a tricky issue - lose_fpu() uses LL/SC atomics
1183 * if FPU is owned and effectively cancels user level LL/SC.
1184 * So, it could be logical to don't restore FPU ownership here.
1185 * But the sequence of multiple FPU instructions is much much
1186 * more often than LL-FPU-SC and I prefer loop here until
1187 * next scheduler cycle cancels FPU ownership
1188 */
1189 own_fpu(1); /* Restore FPU state. */
1190
1191 if (err)
1192 current->thread.cp0_baduaddr = (unsigned long)fault_addr;
1193
1194 MIPS_R2_STATS(fpus);
1195
1196 break;
1197
1198 case lwl_op:
1199 rt = regs->regs[MIPSInst_RT(inst)];
1200 vaddr = regs->regs[MIPSInst_RS(inst)] + MIPSInst_SIMM(inst);
1201 if (!access_ok(VERIFY_READ, vaddr, 4)) {
1202 current->thread.cp0_baduaddr = vaddr;
1203 err = SIGSEGV;
1204 break;
1205 }
1206 __asm__ __volatile__(
1207 " .set push\n"
1208 " .set reorder\n"
1209#ifdef CONFIG_CPU_LITTLE_ENDIAN
1210 "1:" LB "%1, 0(%2)\n"
1211 INS "%0, %1, 24, 8\n"
1212 " andi %1, %2, 0x3\n"
1213 " beq $0, %1, 9f\n"
1214 ADDIU "%2, %2, -1\n"
1215 "2:" LB "%1, 0(%2)\n"
1216 INS "%0, %1, 16, 8\n"
1217 " andi %1, %2, 0x3\n"
1218 " beq $0, %1, 9f\n"
1219 ADDIU "%2, %2, -1\n"
1220 "3:" LB "%1, 0(%2)\n"
1221 INS "%0, %1, 8, 8\n"
1222 " andi %1, %2, 0x3\n"
1223 " beq $0, %1, 9f\n"
1224 ADDIU "%2, %2, -1\n"
1225 "4:" LB "%1, 0(%2)\n"
1226 INS "%0, %1, 0, 8\n"
1227#else /* !CONFIG_CPU_LITTLE_ENDIAN */
1228 "1:" LB "%1, 0(%2)\n"
1229 INS "%0, %1, 24, 8\n"
1230 ADDIU "%2, %2, 1\n"
1231 " andi %1, %2, 0x3\n"
1232 " beq $0, %1, 9f\n"
1233 "2:" LB "%1, 0(%2)\n"
1234 INS "%0, %1, 16, 8\n"
1235 ADDIU "%2, %2, 1\n"
1236 " andi %1, %2, 0x3\n"
1237 " beq $0, %1, 9f\n"
1238 "3:" LB "%1, 0(%2)\n"
1239 INS "%0, %1, 8, 8\n"
1240 ADDIU "%2, %2, 1\n"
1241 " andi %1, %2, 0x3\n"
1242 " beq $0, %1, 9f\n"
1243 "4:" LB "%1, 0(%2)\n"
1244 INS "%0, %1, 0, 8\n"
1245#endif /* CONFIG_CPU_LITTLE_ENDIAN */
1246 "9: sll %0, %0, 0\n"
1247 "10:\n"
1248 " .insn\n"
1249 " .section .fixup,\"ax\"\n"
1250 "8: li %3,%4\n"
1251 " j 10b\n"
1252 " .previous\n"
1253 " .section __ex_table,\"a\"\n"
1254 " .word 1b,8b\n"
1255 " .word 2b,8b\n"
1256 " .word 3b,8b\n"
1257 " .word 4b,8b\n"
1258 " .previous\n"
1259 " .set pop\n"
1260 : "+&r"(rt), "=&r"(rs),
1261 "+&r"(vaddr), "+&r"(err)
1262 : "i"(SIGSEGV));
1263
1264 if (MIPSInst_RT(inst) && !err)
1265 regs->regs[MIPSInst_RT(inst)] = rt;
1266
1267 MIPS_R2_STATS(loads);
1268
1269 break;
1270
1271 case lwr_op:
1272 rt = regs->regs[MIPSInst_RT(inst)];
1273 vaddr = regs->regs[MIPSInst_RS(inst)] + MIPSInst_SIMM(inst);
1274 if (!access_ok(VERIFY_READ, vaddr, 4)) {
1275 current->thread.cp0_baduaddr = vaddr;
1276 err = SIGSEGV;
1277 break;
1278 }
1279 __asm__ __volatile__(
1280 " .set push\n"
1281 " .set reorder\n"
1282#ifdef CONFIG_CPU_LITTLE_ENDIAN
1283 "1:" LB "%1, 0(%2)\n"
1284 INS "%0, %1, 0, 8\n"
1285 ADDIU "%2, %2, 1\n"
1286 " andi %1, %2, 0x3\n"
1287 " beq $0, %1, 9f\n"
1288 "2:" LB "%1, 0(%2)\n"
1289 INS "%0, %1, 8, 8\n"
1290 ADDIU "%2, %2, 1\n"
1291 " andi %1, %2, 0x3\n"
1292 " beq $0, %1, 9f\n"
1293 "3:" LB "%1, 0(%2)\n"
1294 INS "%0, %1, 16, 8\n"
1295 ADDIU "%2, %2, 1\n"
1296 " andi %1, %2, 0x3\n"
1297 " beq $0, %1, 9f\n"
1298 "4:" LB "%1, 0(%2)\n"
1299 INS "%0, %1, 24, 8\n"
1300 " sll %0, %0, 0\n"
1301#else /* !CONFIG_CPU_LITTLE_ENDIAN */
1302 "1:" LB "%1, 0(%2)\n"
1303 INS "%0, %1, 0, 8\n"
1304 " andi %1, %2, 0x3\n"
1305 " beq $0, %1, 9f\n"
1306 ADDIU "%2, %2, -1\n"
1307 "2:" LB "%1, 0(%2)\n"
1308 INS "%0, %1, 8, 8\n"
1309 " andi %1, %2, 0x3\n"
1310 " beq $0, %1, 9f\n"
1311 ADDIU "%2, %2, -1\n"
1312 "3:" LB "%1, 0(%2)\n"
1313 INS "%0, %1, 16, 8\n"
1314 " andi %1, %2, 0x3\n"
1315 " beq $0, %1, 9f\n"
1316 ADDIU "%2, %2, -1\n"
1317 "4:" LB "%1, 0(%2)\n"
1318 INS "%0, %1, 24, 8\n"
1319 " sll %0, %0, 0\n"
1320#endif /* CONFIG_CPU_LITTLE_ENDIAN */
1321 "9:\n"
1322 "10:\n"
1323 " .insn\n"
1324 " .section .fixup,\"ax\"\n"
1325 "8: li %3,%4\n"
1326 " j 10b\n"
1327 " .previous\n"
1328 " .section __ex_table,\"a\"\n"
1329 " .word 1b,8b\n"
1330 " .word 2b,8b\n"
1331 " .word 3b,8b\n"
1332 " .word 4b,8b\n"
1333 " .previous\n"
1334 " .set pop\n"
1335 : "+&r"(rt), "=&r"(rs),
1336 "+&r"(vaddr), "+&r"(err)
1337 : "i"(SIGSEGV));
1338 if (MIPSInst_RT(inst) && !err)
1339 regs->regs[MIPSInst_RT(inst)] = rt;
1340
1341 MIPS_R2_STATS(loads);
1342
1343 break;
1344
1345 case swl_op:
1346 rt = regs->regs[MIPSInst_RT(inst)];
1347 vaddr = regs->regs[MIPSInst_RS(inst)] + MIPSInst_SIMM(inst);
1348 if (!access_ok(VERIFY_WRITE, vaddr, 4)) {
1349 current->thread.cp0_baduaddr = vaddr;
1350 err = SIGSEGV;
1351 break;
1352 }
1353 __asm__ __volatile__(
1354 " .set push\n"
1355 " .set reorder\n"
1356#ifdef CONFIG_CPU_LITTLE_ENDIAN
1357 EXT "%1, %0, 24, 8\n"
1358 "1:" SB "%1, 0(%2)\n"
1359 " andi %1, %2, 0x3\n"
1360 " beq $0, %1, 9f\n"
1361 ADDIU "%2, %2, -1\n"
1362 EXT "%1, %0, 16, 8\n"
1363 "2:" SB "%1, 0(%2)\n"
1364 " andi %1, %2, 0x3\n"
1365 " beq $0, %1, 9f\n"
1366 ADDIU "%2, %2, -1\n"
1367 EXT "%1, %0, 8, 8\n"
1368 "3:" SB "%1, 0(%2)\n"
1369 " andi %1, %2, 0x3\n"
1370 " beq $0, %1, 9f\n"
1371 ADDIU "%2, %2, -1\n"
1372 EXT "%1, %0, 0, 8\n"
1373 "4:" SB "%1, 0(%2)\n"
1374#else /* !CONFIG_CPU_LITTLE_ENDIAN */
1375 EXT "%1, %0, 24, 8\n"
1376 "1:" SB "%1, 0(%2)\n"
1377 ADDIU "%2, %2, 1\n"
1378 " andi %1, %2, 0x3\n"
1379 " beq $0, %1, 9f\n"
1380 EXT "%1, %0, 16, 8\n"
1381 "2:" SB "%1, 0(%2)\n"
1382 ADDIU "%2, %2, 1\n"
1383 " andi %1, %2, 0x3\n"
1384 " beq $0, %1, 9f\n"
1385 EXT "%1, %0, 8, 8\n"
1386 "3:" SB "%1, 0(%2)\n"
1387 ADDIU "%2, %2, 1\n"
1388 " andi %1, %2, 0x3\n"
1389 " beq $0, %1, 9f\n"
1390 EXT "%1, %0, 0, 8\n"
1391 "4:" SB "%1, 0(%2)\n"
1392#endif /* CONFIG_CPU_LITTLE_ENDIAN */
1393 "9:\n"
1394 " .insn\n"
1395 " .section .fixup,\"ax\"\n"
1396 "8: li %3,%4\n"
1397 " j 9b\n"
1398 " .previous\n"
1399 " .section __ex_table,\"a\"\n"
1400 " .word 1b,8b\n"
1401 " .word 2b,8b\n"
1402 " .word 3b,8b\n"
1403 " .word 4b,8b\n"
1404 " .previous\n"
1405 " .set pop\n"
1406 : "+&r"(rt), "=&r"(rs),
1407 "+&r"(vaddr), "+&r"(err)
1408 : "i"(SIGSEGV)
1409 : "memory");
1410
1411 MIPS_R2_STATS(stores);
1412
1413 break;
1414
1415 case swr_op:
1416 rt = regs->regs[MIPSInst_RT(inst)];
1417 vaddr = regs->regs[MIPSInst_RS(inst)] + MIPSInst_SIMM(inst);
1418 if (!access_ok(VERIFY_WRITE, vaddr, 4)) {
1419 current->thread.cp0_baduaddr = vaddr;
1420 err = SIGSEGV;
1421 break;
1422 }
1423 __asm__ __volatile__(
1424 " .set push\n"
1425 " .set reorder\n"
1426#ifdef CONFIG_CPU_LITTLE_ENDIAN
1427 EXT "%1, %0, 0, 8\n"
1428 "1:" SB "%1, 0(%2)\n"
1429 ADDIU "%2, %2, 1\n"
1430 " andi %1, %2, 0x3\n"
1431 " beq $0, %1, 9f\n"
1432 EXT "%1, %0, 8, 8\n"
1433 "2:" SB "%1, 0(%2)\n"
1434 ADDIU "%2, %2, 1\n"
1435 " andi %1, %2, 0x3\n"
1436 " beq $0, %1, 9f\n"
1437 EXT "%1, %0, 16, 8\n"
1438 "3:" SB "%1, 0(%2)\n"
1439 ADDIU "%2, %2, 1\n"
1440 " andi %1, %2, 0x3\n"
1441 " beq $0, %1, 9f\n"
1442 EXT "%1, %0, 24, 8\n"
1443 "4:" SB "%1, 0(%2)\n"
1444#else /* !CONFIG_CPU_LITTLE_ENDIAN */
1445 EXT "%1, %0, 0, 8\n"
1446 "1:" SB "%1, 0(%2)\n"
1447 " andi %1, %2, 0x3\n"
1448 " beq $0, %1, 9f\n"
1449 ADDIU "%2, %2, -1\n"
1450 EXT "%1, %0, 8, 8\n"
1451 "2:" SB "%1, 0(%2)\n"
1452 " andi %1, %2, 0x3\n"
1453 " beq $0, %1, 9f\n"
1454 ADDIU "%2, %2, -1\n"
1455 EXT "%1, %0, 16, 8\n"
1456 "3:" SB "%1, 0(%2)\n"
1457 " andi %1, %2, 0x3\n"
1458 " beq $0, %1, 9f\n"
1459 ADDIU "%2, %2, -1\n"
1460 EXT "%1, %0, 24, 8\n"
1461 "4:" SB "%1, 0(%2)\n"
1462#endif /* CONFIG_CPU_LITTLE_ENDIAN */
1463 "9:\n"
1464 " .insn\n"
1465 " .section .fixup,\"ax\"\n"
1466 "8: li %3,%4\n"
1467 " j 9b\n"
1468 " .previous\n"
1469 " .section __ex_table,\"a\"\n"
1470 " .word 1b,8b\n"
1471 " .word 2b,8b\n"
1472 " .word 3b,8b\n"
1473 " .word 4b,8b\n"
1474 " .previous\n"
1475 " .set pop\n"
1476 : "+&r"(rt), "=&r"(rs),
1477 "+&r"(vaddr), "+&r"(err)
1478 : "i"(SIGSEGV)
1479 : "memory");
1480
1481 MIPS_R2_STATS(stores);
1482
1483 break;
1484
1485 case ldl_op:
1486 if (config_enabled(CONFIG_32BIT)) {
1487 err = SIGILL;
1488 break;
1489 }
1490
1491 rt = regs->regs[MIPSInst_RT(inst)];
1492 vaddr = regs->regs[MIPSInst_RS(inst)] + MIPSInst_SIMM(inst);
1493 if (!access_ok(VERIFY_READ, vaddr, 8)) {
1494 current->thread.cp0_baduaddr = vaddr;
1495 err = SIGSEGV;
1496 break;
1497 }
1498 __asm__ __volatile__(
1499 " .set push\n"
1500 " .set reorder\n"
1501#ifdef CONFIG_CPU_LITTLE_ENDIAN
1502 "1: lb %1, 0(%2)\n"
1503 " dinsu %0, %1, 56, 8\n"
1504 " andi %1, %2, 0x7\n"
1505 " beq $0, %1, 9f\n"
1506 " daddiu %2, %2, -1\n"
1507 "2: lb %1, 0(%2)\n"
1508 " dinsu %0, %1, 48, 8\n"
1509 " andi %1, %2, 0x7\n"
1510 " beq $0, %1, 9f\n"
1511 " daddiu %2, %2, -1\n"
1512 "3: lb %1, 0(%2)\n"
1513 " dinsu %0, %1, 40, 8\n"
1514 " andi %1, %2, 0x7\n"
1515 " beq $0, %1, 9f\n"
1516 " daddiu %2, %2, -1\n"
1517 "4: lb %1, 0(%2)\n"
1518 " dinsu %0, %1, 32, 8\n"
1519 " andi %1, %2, 0x7\n"
1520 " beq $0, %1, 9f\n"
1521 " daddiu %2, %2, -1\n"
1522 "5: lb %1, 0(%2)\n"
1523 " dins %0, %1, 24, 8\n"
1524 " andi %1, %2, 0x7\n"
1525 " beq $0, %1, 9f\n"
1526 " daddiu %2, %2, -1\n"
1527 "6: lb %1, 0(%2)\n"
1528 " dins %0, %1, 16, 8\n"
1529 " andi %1, %2, 0x7\n"
1530 " beq $0, %1, 9f\n"
1531 " daddiu %2, %2, -1\n"
1532 "7: lb %1, 0(%2)\n"
1533 " dins %0, %1, 8, 8\n"
1534 " andi %1, %2, 0x7\n"
1535 " beq $0, %1, 9f\n"
1536 " daddiu %2, %2, -1\n"
1537 "0: lb %1, 0(%2)\n"
1538 " dins %0, %1, 0, 8\n"
1539#else /* !CONFIG_CPU_LITTLE_ENDIAN */
1540 "1: lb %1, 0(%2)\n"
1541 " dinsu %0, %1, 56, 8\n"
1542 " daddiu %2, %2, 1\n"
1543 " andi %1, %2, 0x7\n"
1544 " beq $0, %1, 9f\n"
1545 "2: lb %1, 0(%2)\n"
1546 " dinsu %0, %1, 48, 8\n"
1547 " daddiu %2, %2, 1\n"
1548 " andi %1, %2, 0x7\n"
1549 " beq $0, %1, 9f\n"
1550 "3: lb %1, 0(%2)\n"
1551 " dinsu %0, %1, 40, 8\n"
1552 " daddiu %2, %2, 1\n"
1553 " andi %1, %2, 0x7\n"
1554 " beq $0, %1, 9f\n"
1555 "4: lb %1, 0(%2)\n"
1556 " dinsu %0, %1, 32, 8\n"
1557 " daddiu %2, %2, 1\n"
1558 " andi %1, %2, 0x7\n"
1559 " beq $0, %1, 9f\n"
1560 "5: lb %1, 0(%2)\n"
1561 " dins %0, %1, 24, 8\n"
1562 " daddiu %2, %2, 1\n"
1563 " andi %1, %2, 0x7\n"
1564 " beq $0, %1, 9f\n"
1565 "6: lb %1, 0(%2)\n"
1566 " dins %0, %1, 16, 8\n"
1567 " daddiu %2, %2, 1\n"
1568 " andi %1, %2, 0x7\n"
1569 " beq $0, %1, 9f\n"
1570 "7: lb %1, 0(%2)\n"
1571 " dins %0, %1, 8, 8\n"
1572 " daddiu %2, %2, 1\n"
1573 " andi %1, %2, 0x7\n"
1574 " beq $0, %1, 9f\n"
1575 "0: lb %1, 0(%2)\n"
1576 " dins %0, %1, 0, 8\n"
1577#endif /* CONFIG_CPU_LITTLE_ENDIAN */
1578 "9:\n"
1579 " .insn\n"
1580 " .section .fixup,\"ax\"\n"
1581 "8: li %3,%4\n"
1582 " j 9b\n"
1583 " .previous\n"
1584 " .section __ex_table,\"a\"\n"
1585 " .word 1b,8b\n"
1586 " .word 2b,8b\n"
1587 " .word 3b,8b\n"
1588 " .word 4b,8b\n"
1589 " .word 5b,8b\n"
1590 " .word 6b,8b\n"
1591 " .word 7b,8b\n"
1592 " .word 0b,8b\n"
1593 " .previous\n"
1594 " .set pop\n"
1595 : "+&r"(rt), "=&r"(rs),
1596 "+&r"(vaddr), "+&r"(err)
1597 : "i"(SIGSEGV));
1598 if (MIPSInst_RT(inst) && !err)
1599 regs->regs[MIPSInst_RT(inst)] = rt;
1600
1601 MIPS_R2_STATS(loads);
1602 break;
1603
1604 case ldr_op:
1605 if (config_enabled(CONFIG_32BIT)) {
1606 err = SIGILL;
1607 break;
1608 }
1609
1610 rt = regs->regs[MIPSInst_RT(inst)];
1611 vaddr = regs->regs[MIPSInst_RS(inst)] + MIPSInst_SIMM(inst);
1612 if (!access_ok(VERIFY_READ, vaddr, 8)) {
1613 current->thread.cp0_baduaddr = vaddr;
1614 err = SIGSEGV;
1615 break;
1616 }
1617 __asm__ __volatile__(
1618 " .set push\n"
1619 " .set reorder\n"
1620#ifdef CONFIG_CPU_LITTLE_ENDIAN
1621 "1: lb %1, 0(%2)\n"
1622 " dins %0, %1, 0, 8\n"
1623 " daddiu %2, %2, 1\n"
1624 " andi %1, %2, 0x7\n"
1625 " beq $0, %1, 9f\n"
1626 "2: lb %1, 0(%2)\n"
1627 " dins %0, %1, 8, 8\n"
1628 " daddiu %2, %2, 1\n"
1629 " andi %1, %2, 0x7\n"
1630 " beq $0, %1, 9f\n"
1631 "3: lb %1, 0(%2)\n"
1632 " dins %0, %1, 16, 8\n"
1633 " daddiu %2, %2, 1\n"
1634 " andi %1, %2, 0x7\n"
1635 " beq $0, %1, 9f\n"
1636 "4: lb %1, 0(%2)\n"
1637 " dins %0, %1, 24, 8\n"
1638 " daddiu %2, %2, 1\n"
1639 " andi %1, %2, 0x7\n"
1640 " beq $0, %1, 9f\n"
1641 "5: lb %1, 0(%2)\n"
1642 " dinsu %0, %1, 32, 8\n"
1643 " daddiu %2, %2, 1\n"
1644 " andi %1, %2, 0x7\n"
1645 " beq $0, %1, 9f\n"
1646 "6: lb %1, 0(%2)\n"
1647 " dinsu %0, %1, 40, 8\n"
1648 " daddiu %2, %2, 1\n"
1649 " andi %1, %2, 0x7\n"
1650 " beq $0, %1, 9f\n"
1651 "7: lb %1, 0(%2)\n"
1652 " dinsu %0, %1, 48, 8\n"
1653 " daddiu %2, %2, 1\n"
1654 " andi %1, %2, 0x7\n"
1655 " beq $0, %1, 9f\n"
1656 "0: lb %1, 0(%2)\n"
1657 " dinsu %0, %1, 56, 8\n"
1658#else /* !CONFIG_CPU_LITTLE_ENDIAN */
1659 "1: lb %1, 0(%2)\n"
1660 " dins %0, %1, 0, 8\n"
1661 " andi %1, %2, 0x7\n"
1662 " beq $0, %1, 9f\n"
1663 " daddiu %2, %2, -1\n"
1664 "2: lb %1, 0(%2)\n"
1665 " dins %0, %1, 8, 8\n"
1666 " andi %1, %2, 0x7\n"
1667 " beq $0, %1, 9f\n"
1668 " daddiu %2, %2, -1\n"
1669 "3: lb %1, 0(%2)\n"
1670 " dins %0, %1, 16, 8\n"
1671 " andi %1, %2, 0x7\n"
1672 " beq $0, %1, 9f\n"
1673 " daddiu %2, %2, -1\n"
1674 "4: lb %1, 0(%2)\n"
1675 " dins %0, %1, 24, 8\n"
1676 " andi %1, %2, 0x7\n"
1677 " beq $0, %1, 9f\n"
1678 " daddiu %2, %2, -1\n"
1679 "5: lb %1, 0(%2)\n"
1680 " dinsu %0, %1, 32, 8\n"
1681 " andi %1, %2, 0x7\n"
1682 " beq $0, %1, 9f\n"
1683 " daddiu %2, %2, -1\n"
1684 "6: lb %1, 0(%2)\n"
1685 " dinsu %0, %1, 40, 8\n"
1686 " andi %1, %2, 0x7\n"
1687 " beq $0, %1, 9f\n"
1688 " daddiu %2, %2, -1\n"
1689 "7: lb %1, 0(%2)\n"
1690 " dinsu %0, %1, 48, 8\n"
1691 " andi %1, %2, 0x7\n"
1692 " beq $0, %1, 9f\n"
1693 " daddiu %2, %2, -1\n"
1694 "0: lb %1, 0(%2)\n"
1695 " dinsu %0, %1, 56, 8\n"
1696#endif /* CONFIG_CPU_LITTLE_ENDIAN */
1697 "9:\n"
1698 " .insn\n"
1699 " .section .fixup,\"ax\"\n"
1700 "8: li %3,%4\n"
1701 " j 9b\n"
1702 " .previous\n"
1703 " .section __ex_table,\"a\"\n"
1704 " .word 1b,8b\n"
1705 " .word 2b,8b\n"
1706 " .word 3b,8b\n"
1707 " .word 4b,8b\n"
1708 " .word 5b,8b\n"
1709 " .word 6b,8b\n"
1710 " .word 7b,8b\n"
1711 " .word 0b,8b\n"
1712 " .previous\n"
1713 " .set pop\n"
1714 : "+&r"(rt), "=&r"(rs),
1715 "+&r"(vaddr), "+&r"(err)
1716 : "i"(SIGSEGV));
1717 if (MIPSInst_RT(inst) && !err)
1718 regs->regs[MIPSInst_RT(inst)] = rt;
1719
1720 MIPS_R2_STATS(loads);
1721 break;
1722
1723 case sdl_op:
1724 if (config_enabled(CONFIG_32BIT)) {
1725 err = SIGILL;
1726 break;
1727 }
1728
1729 rt = regs->regs[MIPSInst_RT(inst)];
1730 vaddr = regs->regs[MIPSInst_RS(inst)] + MIPSInst_SIMM(inst);
1731 if (!access_ok(VERIFY_WRITE, vaddr, 8)) {
1732 current->thread.cp0_baduaddr = vaddr;
1733 err = SIGSEGV;
1734 break;
1735 }
1736 __asm__ __volatile__(
1737 " .set push\n"
1738 " .set reorder\n"
1739#ifdef CONFIG_CPU_LITTLE_ENDIAN
1740 " dextu %1, %0, 56, 8\n"
1741 "1: sb %1, 0(%2)\n"
1742 " andi %1, %2, 0x7\n"
1743 " beq $0, %1, 9f\n"
1744 " daddiu %2, %2, -1\n"
1745 " dextu %1, %0, 48, 8\n"
1746 "2: sb %1, 0(%2)\n"
1747 " andi %1, %2, 0x7\n"
1748 " beq $0, %1, 9f\n"
1749 " daddiu %2, %2, -1\n"
1750 " dextu %1, %0, 40, 8\n"
1751 "3: sb %1, 0(%2)\n"
1752 " andi %1, %2, 0x7\n"
1753 " beq $0, %1, 9f\n"
1754 " daddiu %2, %2, -1\n"
1755 " dextu %1, %0, 32, 8\n"
1756 "4: sb %1, 0(%2)\n"
1757 " andi %1, %2, 0x7\n"
1758 " beq $0, %1, 9f\n"
1759 " daddiu %2, %2, -1\n"
1760 " dext %1, %0, 24, 8\n"
1761 "5: sb %1, 0(%2)\n"
1762 " andi %1, %2, 0x7\n"
1763 " beq $0, %1, 9f\n"
1764 " daddiu %2, %2, -1\n"
1765 " dext %1, %0, 16, 8\n"
1766 "6: sb %1, 0(%2)\n"
1767 " andi %1, %2, 0x7\n"
1768 " beq $0, %1, 9f\n"
1769 " daddiu %2, %2, -1\n"
1770 " dext %1, %0, 8, 8\n"
1771 "7: sb %1, 0(%2)\n"
1772 " andi %1, %2, 0x7\n"
1773 " beq $0, %1, 9f\n"
1774 " daddiu %2, %2, -1\n"
1775 " dext %1, %0, 0, 8\n"
1776 "0: sb %1, 0(%2)\n"
1777#else /* !CONFIG_CPU_LITTLE_ENDIAN */
1778 " dextu %1, %0, 56, 8\n"
1779 "1: sb %1, 0(%2)\n"
1780 " daddiu %2, %2, 1\n"
1781 " andi %1, %2, 0x7\n"
1782 " beq $0, %1, 9f\n"
1783 " dextu %1, %0, 48, 8\n"
1784 "2: sb %1, 0(%2)\n"
1785 " daddiu %2, %2, 1\n"
1786 " andi %1, %2, 0x7\n"
1787 " beq $0, %1, 9f\n"
1788 " dextu %1, %0, 40, 8\n"
1789 "3: sb %1, 0(%2)\n"
1790 " daddiu %2, %2, 1\n"
1791 " andi %1, %2, 0x7\n"
1792 " beq $0, %1, 9f\n"
1793 " dextu %1, %0, 32, 8\n"
1794 "4: sb %1, 0(%2)\n"
1795 " daddiu %2, %2, 1\n"
1796 " andi %1, %2, 0x7\n"
1797 " beq $0, %1, 9f\n"
1798 " dext %1, %0, 24, 8\n"
1799 "5: sb %1, 0(%2)\n"
1800 " daddiu %2, %2, 1\n"
1801 " andi %1, %2, 0x7\n"
1802 " beq $0, %1, 9f\n"
1803 " dext %1, %0, 16, 8\n"
1804 "6: sb %1, 0(%2)\n"
1805 " daddiu %2, %2, 1\n"
1806 " andi %1, %2, 0x7\n"
1807 " beq $0, %1, 9f\n"
1808 " dext %1, %0, 8, 8\n"
1809 "7: sb %1, 0(%2)\n"
1810 " daddiu %2, %2, 1\n"
1811 " andi %1, %2, 0x7\n"
1812 " beq $0, %1, 9f\n"
1813 " dext %1, %0, 0, 8\n"
1814 "0: sb %1, 0(%2)\n"
1815#endif /* CONFIG_CPU_LITTLE_ENDIAN */
1816 "9:\n"
1817 " .insn\n"
1818 " .section .fixup,\"ax\"\n"
1819 "8: li %3,%4\n"
1820 " j 9b\n"
1821 " .previous\n"
1822 " .section __ex_table,\"a\"\n"
1823 " .word 1b,8b\n"
1824 " .word 2b,8b\n"
1825 " .word 3b,8b\n"
1826 " .word 4b,8b\n"
1827 " .word 5b,8b\n"
1828 " .word 6b,8b\n"
1829 " .word 7b,8b\n"
1830 " .word 0b,8b\n"
1831 " .previous\n"
1832 " .set pop\n"
1833 : "+&r"(rt), "=&r"(rs),
1834 "+&r"(vaddr), "+&r"(err)
1835 : "i"(SIGSEGV)
1836 : "memory");
1837
1838 MIPS_R2_STATS(stores);
1839 break;
1840
1841 case sdr_op:
1842 if (config_enabled(CONFIG_32BIT)) {
1843 err = SIGILL;
1844 break;
1845 }
1846
1847 rt = regs->regs[MIPSInst_RT(inst)];
1848 vaddr = regs->regs[MIPSInst_RS(inst)] + MIPSInst_SIMM(inst);
1849 if (!access_ok(VERIFY_WRITE, vaddr, 8)) {
1850 current->thread.cp0_baduaddr = vaddr;
1851 err = SIGSEGV;
1852 break;
1853 }
1854 __asm__ __volatile__(
1855 " .set push\n"
1856 " .set reorder\n"
1857#ifdef CONFIG_CPU_LITTLE_ENDIAN
1858 " dext %1, %0, 0, 8\n"
1859 "1: sb %1, 0(%2)\n"
1860 " daddiu %2, %2, 1\n"
1861 " andi %1, %2, 0x7\n"
1862 " beq $0, %1, 9f\n"
1863 " dext %1, %0, 8, 8\n"
1864 "2: sb %1, 0(%2)\n"
1865 " daddiu %2, %2, 1\n"
1866 " andi %1, %2, 0x7\n"
1867 " beq $0, %1, 9f\n"
1868 " dext %1, %0, 16, 8\n"
1869 "3: sb %1, 0(%2)\n"
1870 " daddiu %2, %2, 1\n"
1871 " andi %1, %2, 0x7\n"
1872 " beq $0, %1, 9f\n"
1873 " dext %1, %0, 24, 8\n"
1874 "4: sb %1, 0(%2)\n"
1875 " daddiu %2, %2, 1\n"
1876 " andi %1, %2, 0x7\n"
1877 " beq $0, %1, 9f\n"
1878 " dextu %1, %0, 32, 8\n"
1879 "5: sb %1, 0(%2)\n"
1880 " daddiu %2, %2, 1\n"
1881 " andi %1, %2, 0x7\n"
1882 " beq $0, %1, 9f\n"
1883 " dextu %1, %0, 40, 8\n"
1884 "6: sb %1, 0(%2)\n"
1885 " daddiu %2, %2, 1\n"
1886 " andi %1, %2, 0x7\n"
1887 " beq $0, %1, 9f\n"
1888 " dextu %1, %0, 48, 8\n"
1889 "7: sb %1, 0(%2)\n"
1890 " daddiu %2, %2, 1\n"
1891 " andi %1, %2, 0x7\n"
1892 " beq $0, %1, 9f\n"
1893 " dextu %1, %0, 56, 8\n"
1894 "0: sb %1, 0(%2)\n"
1895#else /* !CONFIG_CPU_LITTLE_ENDIAN */
1896 " dext %1, %0, 0, 8\n"
1897 "1: sb %1, 0(%2)\n"
1898 " andi %1, %2, 0x7\n"
1899 " beq $0, %1, 9f\n"
1900 " daddiu %2, %2, -1\n"
1901 " dext %1, %0, 8, 8\n"
1902 "2: sb %1, 0(%2)\n"
1903 " andi %1, %2, 0x7\n"
1904 " beq $0, %1, 9f\n"
1905 " daddiu %2, %2, -1\n"
1906 " dext %1, %0, 16, 8\n"
1907 "3: sb %1, 0(%2)\n"
1908 " andi %1, %2, 0x7\n"
1909 " beq $0, %1, 9f\n"
1910 " daddiu %2, %2, -1\n"
1911 " dext %1, %0, 24, 8\n"
1912 "4: sb %1, 0(%2)\n"
1913 " andi %1, %2, 0x7\n"
1914 " beq $0, %1, 9f\n"
1915 " daddiu %2, %2, -1\n"
1916 " dextu %1, %0, 32, 8\n"
1917 "5: sb %1, 0(%2)\n"
1918 " andi %1, %2, 0x7\n"
1919 " beq $0, %1, 9f\n"
1920 " daddiu %2, %2, -1\n"
1921 " dextu %1, %0, 40, 8\n"
1922 "6: sb %1, 0(%2)\n"
1923 " andi %1, %2, 0x7\n"
1924 " beq $0, %1, 9f\n"
1925 " daddiu %2, %2, -1\n"
1926 " dextu %1, %0, 48, 8\n"
1927 "7: sb %1, 0(%2)\n"
1928 " andi %1, %2, 0x7\n"
1929 " beq $0, %1, 9f\n"
1930 " daddiu %2, %2, -1\n"
1931 " dextu %1, %0, 56, 8\n"
1932 "0: sb %1, 0(%2)\n"
1933#endif /* CONFIG_CPU_LITTLE_ENDIAN */
1934 "9:\n"
1935 " .insn\n"
1936 " .section .fixup,\"ax\"\n"
1937 "8: li %3,%4\n"
1938 " j 9b\n"
1939 " .previous\n"
1940 " .section __ex_table,\"a\"\n"
1941 " .word 1b,8b\n"
1942 " .word 2b,8b\n"
1943 " .word 3b,8b\n"
1944 " .word 4b,8b\n"
1945 " .word 5b,8b\n"
1946 " .word 6b,8b\n"
1947 " .word 7b,8b\n"
1948 " .word 0b,8b\n"
1949 " .previous\n"
1950 " .set pop\n"
1951 : "+&r"(rt), "=&r"(rs),
1952 "+&r"(vaddr), "+&r"(err)
1953 : "i"(SIGSEGV)
1954 : "memory");
1955
1956 MIPS_R2_STATS(stores);
1957
1958 break;
1959 case ll_op:
1960 vaddr = regs->regs[MIPSInst_RS(inst)] + MIPSInst_SIMM(inst);
1961 if (vaddr & 0x3) {
1962 current->thread.cp0_baduaddr = vaddr;
1963 err = SIGBUS;
1964 break;
1965 }
1966 if (!access_ok(VERIFY_READ, vaddr, 4)) {
1967 current->thread.cp0_baduaddr = vaddr;
1968 err = SIGBUS;
1969 break;
1970 }
1971
1972 if (!cpu_has_rw_llb) {
1973 /*
1974 * An LL/SC block can't be safely emulated without
1975 * a Config5/LLB availability. So it's probably time to
1976 * kill our process before things get any worse. This is
1977 * because Config5/LLB allows us to use ERETNC so that
1978 * the LLAddr/LLB bit is not cleared when we return from
1979 * an exception. MIPS R2 LL/SC instructions trap with an
1980 * RI exception so once we emulate them here, we return
1981 * back to userland with ERETNC. That preserves the
1982 * LLAddr/LLB so the subsequent SC instruction will
1983 * succeed preserving the atomic semantics of the LL/SC
1984 * block. Without that, there is no safe way to emulate
1985 * an LL/SC block in MIPSR2 userland.
1986 */
1987 pr_err("Can't emulate MIPSR2 LL/SC without Config5/LLB\n");
1988 err = SIGKILL;
1989 break;
1990 }
1991
1992 __asm__ __volatile__(
1993 "1:\n"
1994 "ll %0, 0(%2)\n"
1995 "2:\n"
1996 ".insn\n"
1997 ".section .fixup,\"ax\"\n"
1998 "3:\n"
1999 "li %1, %3\n"
2000 "j 2b\n"
2001 ".previous\n"
2002 ".section __ex_table,\"a\"\n"
2003 ".word 1b, 3b\n"
2004 ".previous\n"
2005 : "=&r"(res), "+&r"(err)
2006 : "r"(vaddr), "i"(SIGSEGV)
2007 : "memory");
2008
2009 if (MIPSInst_RT(inst) && !err)
2010 regs->regs[MIPSInst_RT(inst)] = res;
2011 MIPS_R2_STATS(llsc);
2012
2013 break;
2014
2015 case sc_op:
2016 vaddr = regs->regs[MIPSInst_RS(inst)] + MIPSInst_SIMM(inst);
2017 if (vaddr & 0x3) {
2018 current->thread.cp0_baduaddr = vaddr;
2019 err = SIGBUS;
2020 break;
2021 }
2022 if (!access_ok(VERIFY_WRITE, vaddr, 4)) {
2023 current->thread.cp0_baduaddr = vaddr;
2024 err = SIGBUS;
2025 break;
2026 }
2027
2028 if (!cpu_has_rw_llb) {
2029 /*
2030 * An LL/SC block can't be safely emulated without
2031 * a Config5/LLB availability. So it's probably time to
2032 * kill our process before things get any worse. This is
2033 * because Config5/LLB allows us to use ERETNC so that
2034 * the LLAddr/LLB bit is not cleared when we return from
2035 * an exception. MIPS R2 LL/SC instructions trap with an
2036 * RI exception so once we emulate them here, we return
2037 * back to userland with ERETNC. That preserves the
2038 * LLAddr/LLB so the subsequent SC instruction will
2039 * succeed preserving the atomic semantics of the LL/SC
2040 * block. Without that, there is no safe way to emulate
2041 * an LL/SC block in MIPSR2 userland.
2042 */
2043 pr_err("Can't emulate MIPSR2 LL/SC without Config5/LLB\n");
2044 err = SIGKILL;
2045 break;
2046 }
2047
2048 res = regs->regs[MIPSInst_RT(inst)];
2049
2050 __asm__ __volatile__(
2051 "1:\n"
2052 "sc %0, 0(%2)\n"
2053 "2:\n"
2054 ".insn\n"
2055 ".section .fixup,\"ax\"\n"
2056 "3:\n"
2057 "li %1, %3\n"
2058 "j 2b\n"
2059 ".previous\n"
2060 ".section __ex_table,\"a\"\n"
2061 ".word 1b, 3b\n"
2062 ".previous\n"
2063 : "+&r"(res), "+&r"(err)
2064 : "r"(vaddr), "i"(SIGSEGV));
2065
2066 if (MIPSInst_RT(inst) && !err)
2067 regs->regs[MIPSInst_RT(inst)] = res;
2068
2069 MIPS_R2_STATS(llsc);
2070
2071 break;
2072
2073 case lld_op:
2074 if (config_enabled(CONFIG_32BIT)) {
2075 err = SIGILL;
2076 break;
2077 }
2078
2079 vaddr = regs->regs[MIPSInst_RS(inst)] + MIPSInst_SIMM(inst);
2080 if (vaddr & 0x7) {
2081 current->thread.cp0_baduaddr = vaddr;
2082 err = SIGBUS;
2083 break;
2084 }
2085 if (!access_ok(VERIFY_READ, vaddr, 8)) {
2086 current->thread.cp0_baduaddr = vaddr;
2087 err = SIGBUS;
2088 break;
2089 }
2090
2091 if (!cpu_has_rw_llb) {
2092 /*
2093 * An LL/SC block can't be safely emulated without
2094 * a Config5/LLB availability. So it's probably time to
2095 * kill our process before things get any worse. This is
2096 * because Config5/LLB allows us to use ERETNC so that
2097 * the LLAddr/LLB bit is not cleared when we return from
2098 * an exception. MIPS R2 LL/SC instructions trap with an
2099 * RI exception so once we emulate them here, we return
2100 * back to userland with ERETNC. That preserves the
2101 * LLAddr/LLB so the subsequent SC instruction will
2102 * succeed preserving the atomic semantics of the LL/SC
2103 * block. Without that, there is no safe way to emulate
2104 * an LL/SC block in MIPSR2 userland.
2105 */
2106 pr_err("Can't emulate MIPSR2 LL/SC without Config5/LLB\n");
2107 err = SIGKILL;
2108 break;
2109 }
2110
2111 __asm__ __volatile__(
2112 "1:\n"
2113 "lld %0, 0(%2)\n"
2114 "2:\n"
2115 ".insn\n"
2116 ".section .fixup,\"ax\"\n"
2117 "3:\n"
2118 "li %1, %3\n"
2119 "j 2b\n"
2120 ".previous\n"
2121 ".section __ex_table,\"a\"\n"
2122 ".word 1b, 3b\n"
2123 ".previous\n"
2124 : "=&r"(res), "+&r"(err)
2125 : "r"(vaddr), "i"(SIGSEGV)
2126 : "memory");
2127 if (MIPSInst_RT(inst) && !err)
2128 regs->regs[MIPSInst_RT(inst)] = res;
2129
2130 MIPS_R2_STATS(llsc);
2131
2132 break;
2133
2134 case scd_op:
2135 if (config_enabled(CONFIG_32BIT)) {
2136 err = SIGILL;
2137 break;
2138 }
2139
2140 vaddr = regs->regs[MIPSInst_RS(inst)] + MIPSInst_SIMM(inst);
2141 if (vaddr & 0x7) {
2142 current->thread.cp0_baduaddr = vaddr;
2143 err = SIGBUS;
2144 break;
2145 }
2146 if (!access_ok(VERIFY_WRITE, vaddr, 8)) {
2147 current->thread.cp0_baduaddr = vaddr;
2148 err = SIGBUS;
2149 break;
2150 }
2151
2152 if (!cpu_has_rw_llb) {
2153 /*
2154 * An LL/SC block can't be safely emulated without
2155 * a Config5/LLB availability. So it's probably time to
2156 * kill our process before things get any worse. This is
2157 * because Config5/LLB allows us to use ERETNC so that
2158 * the LLAddr/LLB bit is not cleared when we return from
2159 * an exception. MIPS R2 LL/SC instructions trap with an
2160 * RI exception so once we emulate them here, we return
2161 * back to userland with ERETNC. That preserves the
2162 * LLAddr/LLB so the subsequent SC instruction will
2163 * succeed preserving the atomic semantics of the LL/SC
2164 * block. Without that, there is no safe way to emulate
2165 * an LL/SC block in MIPSR2 userland.
2166 */
2167 pr_err("Can't emulate MIPSR2 LL/SC without Config5/LLB\n");
2168 err = SIGKILL;
2169 break;
2170 }
2171
2172 res = regs->regs[MIPSInst_RT(inst)];
2173
2174 __asm__ __volatile__(
2175 "1:\n"
2176 "scd %0, 0(%2)\n"
2177 "2:\n"
2178 ".insn\n"
2179 ".section .fixup,\"ax\"\n"
2180 "3:\n"
2181 "li %1, %3\n"
2182 "j 2b\n"
2183 ".previous\n"
2184 ".section __ex_table,\"a\"\n"
2185 ".word 1b, 3b\n"
2186 ".previous\n"
2187 : "+&r"(res), "+&r"(err)
2188 : "r"(vaddr), "i"(SIGSEGV));
2189
2190 if (MIPSInst_RT(inst) && !err)
2191 regs->regs[MIPSInst_RT(inst)] = res;
2192
2193 MIPS_R2_STATS(llsc);
2194
2195 break;
2196 case pref_op:
2197 /* skip it */
2198 break;
2199 default:
2200 err = SIGILL;
2201 }
2202
2203 /*
2204 * Lets not return to userland just yet. It's constly and
2205 * it's likely we have more R2 instructions to emulate
2206 */
2207 if (!err && (pass++ < MIPS_R2_EMUL_TOTAL_PASS)) {
2208 regs->cp0_cause &= ~CAUSEF_BD;
2209 err = get_user(inst, (u32 __user *)regs->cp0_epc);
2210 if (!err)
2211 goto repeat;
2212
2213 if (err < 0)
2214 err = SIGSEGV;
2215 }
2216
2217 if (err && (err != SIGEMT)) {
2218 regs->regs[31] = r31;
2219 regs->cp0_epc = epc;
2220 }
2221
2222 /* Likely a MIPS R6 compatible instruction */
2223 if (pass && (err == SIGILL))
2224 err = 0;
2225
2226 return err;
2227}
2228
2229#ifdef CONFIG_DEBUG_FS
2230
2231static int mipsr2_stats_show(struct seq_file *s, void *unused)
2232{
2233
2234 seq_printf(s, "Instruction\tTotal\tBDslot\n------------------------------\n");
2235 seq_printf(s, "movs\t\t%ld\t%ld\n",
2236 (unsigned long)__this_cpu_read(mipsr2emustats.movs),
2237 (unsigned long)__this_cpu_read(mipsr2bdemustats.movs));
2238 seq_printf(s, "hilo\t\t%ld\t%ld\n",
2239 (unsigned long)__this_cpu_read(mipsr2emustats.hilo),
2240 (unsigned long)__this_cpu_read(mipsr2bdemustats.hilo));
2241 seq_printf(s, "muls\t\t%ld\t%ld\n",
2242 (unsigned long)__this_cpu_read(mipsr2emustats.muls),
2243 (unsigned long)__this_cpu_read(mipsr2bdemustats.muls));
2244 seq_printf(s, "divs\t\t%ld\t%ld\n",
2245 (unsigned long)__this_cpu_read(mipsr2emustats.divs),
2246 (unsigned long)__this_cpu_read(mipsr2bdemustats.divs));
2247 seq_printf(s, "dsps\t\t%ld\t%ld\n",
2248 (unsigned long)__this_cpu_read(mipsr2emustats.dsps),
2249 (unsigned long)__this_cpu_read(mipsr2bdemustats.dsps));
2250 seq_printf(s, "bops\t\t%ld\t%ld\n",
2251 (unsigned long)__this_cpu_read(mipsr2emustats.bops),
2252 (unsigned long)__this_cpu_read(mipsr2bdemustats.bops));
2253 seq_printf(s, "traps\t\t%ld\t%ld\n",
2254 (unsigned long)__this_cpu_read(mipsr2emustats.traps),
2255 (unsigned long)__this_cpu_read(mipsr2bdemustats.traps));
2256 seq_printf(s, "fpus\t\t%ld\t%ld\n",
2257 (unsigned long)__this_cpu_read(mipsr2emustats.fpus),
2258 (unsigned long)__this_cpu_read(mipsr2bdemustats.fpus));
2259 seq_printf(s, "loads\t\t%ld\t%ld\n",
2260 (unsigned long)__this_cpu_read(mipsr2emustats.loads),
2261 (unsigned long)__this_cpu_read(mipsr2bdemustats.loads));
2262 seq_printf(s, "stores\t\t%ld\t%ld\n",
2263 (unsigned long)__this_cpu_read(mipsr2emustats.stores),
2264 (unsigned long)__this_cpu_read(mipsr2bdemustats.stores));
2265 seq_printf(s, "llsc\t\t%ld\t%ld\n",
2266 (unsigned long)__this_cpu_read(mipsr2emustats.llsc),
2267 (unsigned long)__this_cpu_read(mipsr2bdemustats.llsc));
2268 seq_printf(s, "dsemul\t\t%ld\t%ld\n",
2269 (unsigned long)__this_cpu_read(mipsr2emustats.dsemul),
2270 (unsigned long)__this_cpu_read(mipsr2bdemustats.dsemul));
2271 seq_printf(s, "jr\t\t%ld\n",
2272 (unsigned long)__this_cpu_read(mipsr2bremustats.jrs));
2273 seq_printf(s, "bltzl\t\t%ld\n",
2274 (unsigned long)__this_cpu_read(mipsr2bremustats.bltzl));
2275 seq_printf(s, "bgezl\t\t%ld\n",
2276 (unsigned long)__this_cpu_read(mipsr2bremustats.bgezl));
2277 seq_printf(s, "bltzll\t\t%ld\n",
2278 (unsigned long)__this_cpu_read(mipsr2bremustats.bltzll));
2279 seq_printf(s, "bgezll\t\t%ld\n",
2280 (unsigned long)__this_cpu_read(mipsr2bremustats.bgezll));
2281 seq_printf(s, "bltzal\t\t%ld\n",
2282 (unsigned long)__this_cpu_read(mipsr2bremustats.bltzal));
2283 seq_printf(s, "bgezal\t\t%ld\n",
2284 (unsigned long)__this_cpu_read(mipsr2bremustats.bgezal));
2285 seq_printf(s, "beql\t\t%ld\n",
2286 (unsigned long)__this_cpu_read(mipsr2bremustats.beql));
2287 seq_printf(s, "bnel\t\t%ld\n",
2288 (unsigned long)__this_cpu_read(mipsr2bremustats.bnel));
2289 seq_printf(s, "blezl\t\t%ld\n",
2290 (unsigned long)__this_cpu_read(mipsr2bremustats.blezl));
2291 seq_printf(s, "bgtzl\t\t%ld\n",
2292 (unsigned long)__this_cpu_read(mipsr2bremustats.bgtzl));
2293
2294 return 0;
2295}
2296
2297static int mipsr2_stats_clear_show(struct seq_file *s, void *unused)
2298{
2299 mipsr2_stats_show(s, unused);
2300
2301 __this_cpu_write((mipsr2emustats).movs, 0);
2302 __this_cpu_write((mipsr2bdemustats).movs, 0);
2303 __this_cpu_write((mipsr2emustats).hilo, 0);
2304 __this_cpu_write((mipsr2bdemustats).hilo, 0);
2305 __this_cpu_write((mipsr2emustats).muls, 0);
2306 __this_cpu_write((mipsr2bdemustats).muls, 0);
2307 __this_cpu_write((mipsr2emustats).divs, 0);
2308 __this_cpu_write((mipsr2bdemustats).divs, 0);
2309 __this_cpu_write((mipsr2emustats).dsps, 0);
2310 __this_cpu_write((mipsr2bdemustats).dsps, 0);
2311 __this_cpu_write((mipsr2emustats).bops, 0);
2312 __this_cpu_write((mipsr2bdemustats).bops, 0);
2313 __this_cpu_write((mipsr2emustats).traps, 0);
2314 __this_cpu_write((mipsr2bdemustats).traps, 0);
2315 __this_cpu_write((mipsr2emustats).fpus, 0);
2316 __this_cpu_write((mipsr2bdemustats).fpus, 0);
2317 __this_cpu_write((mipsr2emustats).loads, 0);
2318 __this_cpu_write((mipsr2bdemustats).loads, 0);
2319 __this_cpu_write((mipsr2emustats).stores, 0);
2320 __this_cpu_write((mipsr2bdemustats).stores, 0);
2321 __this_cpu_write((mipsr2emustats).llsc, 0);
2322 __this_cpu_write((mipsr2bdemustats).llsc, 0);
2323 __this_cpu_write((mipsr2emustats).dsemul, 0);
2324 __this_cpu_write((mipsr2bdemustats).dsemul, 0);
2325 __this_cpu_write((mipsr2bremustats).jrs, 0);
2326 __this_cpu_write((mipsr2bremustats).bltzl, 0);
2327 __this_cpu_write((mipsr2bremustats).bgezl, 0);
2328 __this_cpu_write((mipsr2bremustats).bltzll, 0);
2329 __this_cpu_write((mipsr2bremustats).bgezll, 0);
2330 __this_cpu_write((mipsr2bremustats).bltzal, 0);
2331 __this_cpu_write((mipsr2bremustats).bgezal, 0);
2332 __this_cpu_write((mipsr2bremustats).beql, 0);
2333 __this_cpu_write((mipsr2bremustats).bnel, 0);
2334 __this_cpu_write((mipsr2bremustats).blezl, 0);
2335 __this_cpu_write((mipsr2bremustats).bgtzl, 0);
2336
2337 return 0;
2338}
2339
2340static int mipsr2_stats_open(struct inode *inode, struct file *file)
2341{
2342 return single_open(file, mipsr2_stats_show, inode->i_private);
2343}
2344
2345static int mipsr2_stats_clear_open(struct inode *inode, struct file *file)
2346{
2347 return single_open(file, mipsr2_stats_clear_show, inode->i_private);
2348}
2349
2350static const struct file_operations mipsr2_emul_fops = {
2351 .open = mipsr2_stats_open,
2352 .read = seq_read,
2353 .llseek = seq_lseek,
2354 .release = single_release,
2355};
2356
2357static const struct file_operations mipsr2_clear_fops = {
2358 .open = mipsr2_stats_clear_open,
2359 .read = seq_read,
2360 .llseek = seq_lseek,
2361 .release = single_release,
2362};
2363
2364
2365static int __init mipsr2_init_debugfs(void)
2366{
2367 struct dentry *mipsr2_emul;
2368
2369 if (!mips_debugfs_dir)
2370 return -ENODEV;
2371
2372 mipsr2_emul = debugfs_create_file("r2_emul_stats", S_IRUGO,
2373 mips_debugfs_dir, NULL,
2374 &mipsr2_emul_fops);
2375 if (!mipsr2_emul)
2376 return -ENOMEM;
2377
2378 mipsr2_emul = debugfs_create_file("r2_emul_stats_clear", S_IRUGO,
2379 mips_debugfs_dir, NULL,
2380 &mipsr2_clear_fops);
2381 if (!mipsr2_emul)
2382 return -ENOMEM;
2383
2384 return 0;
2385}
2386
2387device_initcall(mipsr2_init_debugfs);
2388
2389#endif /* CONFIG_DEBUG_FS */