]> git.proxmox.com Git - mirror_ubuntu-bionic-kernel.git/blob - arch/powerpc/lib/sstep.c
projects / mirror_ubuntu-bionic-kernel.git / blob
? search:
summary | shortlog | log | commit | commitdiff | tree
blame | history | raw | HEAD
Merge branch 'next' of git://git.kernel.org/pub/scm/linux/kernel/git/rzhang/linux
[mirror_ubuntu-bionic-kernel.git] / arch / powerpc / lib / sstep.c
1 /*
2 * Single-step support.
3 *
4 * Copyright (C) 2004 Paul Mackerras <paulus@au.ibm.com>, IBM
5 *
6 * This program is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU General Public License
8 * as published by the Free Software Foundation; either version
9 * 2 of the License, or (at your option) any later version.
10 */
11 #include <linux/kernel.h>
12 #include <linux/kprobes.h>
13 #include <linux/ptrace.h>
14 #include <linux/prefetch.h>
15 #include <asm/sstep.h>
16 #include <asm/processor.h>
17 #include <linux/uaccess.h>
18 #include <asm/cpu_has_feature.h>
19 #include <asm/cputable.h>
20
21 extern char system_call_common[];
22
23 #ifdef CONFIG_PPC64
24 /* Bits in SRR1 that are copied from MSR */
25 #define MSR_MASK 0xffffffff87c0ffffUL
26 #else
27 #define MSR_MASK 0x87c0ffff
28 #endif
29
30 /* Bits in XER */
31 #define XER_SO 0x80000000U
32 #define XER_OV 0x40000000U
33 #define XER_CA 0x20000000U
34
35 #ifdef CONFIG_PPC_FPU
36 /*
37 * Functions in ldstfp.S
38 */
39 extern void get_fpr(int rn, double *p);
40 extern void put_fpr(int rn, const double *p);
41 extern void get_vr(int rn, __vector128 *p);
42 extern void put_vr(int rn, __vector128 *p);
43 extern void load_vsrn(int vsr, const void *p);
44 extern void store_vsrn(int vsr, void *p);
45 extern void conv_sp_to_dp(const float *sp, double *dp);
46 extern void conv_dp_to_sp(const double *dp, float *sp);
47 #endif
48
49 #ifdef __powerpc64__
50 /*
51 * Functions in quad.S
52 */
53 extern int do_lq(unsigned long ea, unsigned long *regs);
54 extern int do_stq(unsigned long ea, unsigned long val0, unsigned long val1);
55 extern int do_lqarx(unsigned long ea, unsigned long *regs);
56 extern int do_stqcx(unsigned long ea, unsigned long val0, unsigned long val1,
57 unsigned int *crp);
58 #endif
59
60 #ifdef __LITTLE_ENDIAN__
61 #define IS_LE 1
62 #define IS_BE 0
63 #else
64 #define IS_LE 0
65 #define IS_BE 1
66 #endif
67
68 /*
69 * Emulate the truncation of 64 bit values in 32-bit mode.
70 */
71 static nokprobe_inline unsigned long truncate_if_32bit(unsigned long msr,
72 unsigned long val)
73 {
74 #ifdef __powerpc64__
75 if ((msr & MSR_64BIT) == 0)
76 val &= 0xffffffffUL;
77 #endif
78 return val;
79 }
80
81 /*
82 * Determine whether a conditional branch instruction would branch.
83 */
84 static nokprobe_inline int branch_taken(unsigned int instr,
85 const struct pt_regs *regs,
86 struct instruction_op *op)
87 {
88 unsigned int bo = (instr >> 21) & 0x1f;
89 unsigned int bi;
90
91 if ((bo & 4) == 0) {
92 /* decrement counter */
93 op->type |= DECCTR;
94 if (((bo >> 1) & 1) ^ (regs->ctr == 1))
95 return 0;
96 }
97 if ((bo & 0x10) == 0) {
98 /* check bit from CR */
99 bi = (instr >> 16) & 0x1f;
100 if (((regs->ccr >> (31 - bi)) & 1) != ((bo >> 3) & 1))
101 return 0;
102 }
103 return 1;
104 }
105
106 static nokprobe_inline long address_ok(struct pt_regs *regs,
107 unsigned long ea, int nb)
108 {
109 if (!user_mode(regs))
110 return 1;
111 if (__access_ok(ea, nb, USER_DS))
112 return 1;
113 if (__access_ok(ea, 1, USER_DS))
114 /* Access overlaps the end of the user region */
115 regs->dar = USER_DS.seg;
116 else
117 regs->dar = ea;
118 return 0;
119 }
120
121 /*
122 * Calculate effective address for a D-form instruction
123 */
124 static nokprobe_inline unsigned long dform_ea(unsigned int instr,
125 const struct pt_regs *regs)
126 {
127 int ra;
128 unsigned long ea;
129
130 ra = (instr >> 16) & 0x1f;
131 ea = (signed short) instr; /* sign-extend */
132 if (ra)
133 ea += regs->gpr[ra];
134
135 return ea;
136 }
137
138 #ifdef __powerpc64__
139 /*
140 * Calculate effective address for a DS-form instruction
141 */
142 static nokprobe_inline unsigned long dsform_ea(unsigned int instr,
143 const struct pt_regs *regs)
144 {
145 int ra;
146 unsigned long ea;
147
148 ra = (instr >> 16) & 0x1f;
149 ea = (signed short) (instr & ~3); /* sign-extend */
150 if (ra)
151 ea += regs->gpr[ra];
152
153 return ea;
154 }
155
156 /*
157 * Calculate effective address for a DQ-form instruction
158 */
159 static nokprobe_inline unsigned long dqform_ea(unsigned int instr,
160 const struct pt_regs *regs)
161 {
162 int ra;
163 unsigned long ea;
164
165 ra = (instr >> 16) & 0x1f;
166 ea = (signed short) (instr & ~0xf); /* sign-extend */
167 if (ra)
168 ea += regs->gpr[ra];
169
170 return ea;
171 }
172 #endif /* __powerpc64 */
173
174 /*
175 * Calculate effective address for an X-form instruction
176 */
177 static nokprobe_inline unsigned long xform_ea(unsigned int instr,
178 const struct pt_regs *regs)
179 {
180 int ra, rb;
181 unsigned long ea;
182
183 ra = (instr >> 16) & 0x1f;
184 rb = (instr >> 11) & 0x1f;
185 ea = regs->gpr[rb];
186 if (ra)
187 ea += regs->gpr[ra];
188
189 return ea;
190 }
191
192 /*
193 * Return the largest power of 2, not greater than sizeof(unsigned long),
194 * such that x is a multiple of it.
195 */
196 static nokprobe_inline unsigned long max_align(unsigned long x)
197 {
198 x |= sizeof(unsigned long);
199 return x & -x; /* isolates rightmost bit */
200 }
201
202 static nokprobe_inline unsigned long byterev_2(unsigned long x)
203 {
204 return ((x >> 8) & 0xff) | ((x & 0xff) << 8);
205 }
206
207 static nokprobe_inline unsigned long byterev_4(unsigned long x)
208 {
209 return ((x >> 24) & 0xff) | ((x >> 8) & 0xff00) |
210 ((x & 0xff00) << 8) | ((x & 0xff) << 24);
211 }
212
213 #ifdef __powerpc64__
214 static nokprobe_inline unsigned long byterev_8(unsigned long x)
215 {
216 return (byterev_4(x) << 32) | byterev_4(x >> 32);
217 }
218 #endif
219
220 static nokprobe_inline void do_byte_reverse(void *ptr, int nb)
221 {
222 switch (nb) {
223 case 2:
224 *(u16 *)ptr = byterev_2(*(u16 *)ptr);
225 break;
226 case 4:
227 *(u32 *)ptr = byterev_4(*(u32 *)ptr);
228 break;
229 #ifdef __powerpc64__
230 case 8:
231 *(unsigned long *)ptr = byterev_8(*(unsigned long *)ptr);
232 break;
233 case 16: {
234 unsigned long *up = (unsigned long *)ptr;
235 unsigned long tmp;
236 tmp = byterev_8(up[0]);
237 up[0] = byterev_8(up[1]);
238 up[1] = tmp;
239 break;
240 }
241 #endif
242 default:
243 WARN_ON_ONCE(1);
244 }
245 }
246
247 static nokprobe_inline int read_mem_aligned(unsigned long *dest,
248 unsigned long ea, int nb,
249 struct pt_regs *regs)
250 {
251 int err = 0;
252 unsigned long x = 0;
253
254 switch (nb) {
255 case 1:
256 err = __get_user(x, (unsigned char __user *) ea);
257 break;
258 case 2:
259 err = __get_user(x, (unsigned short __user *) ea);
260 break;
261 case 4:
262 err = __get_user(x, (unsigned int __user *) ea);
263 break;
264 #ifdef __powerpc64__
265 case 8:
266 err = __get_user(x, (unsigned long __user *) ea);
267 break;
268 #endif
269 }
270 if (!err)
271 *dest = x;
272 else
273 regs->dar = ea;
274 return err;
275 }
276
277 /*
278 * Copy from userspace to a buffer, using the largest possible
279 * aligned accesses, up to sizeof(long).
280 */
281 static int nokprobe_inline copy_mem_in(u8 *dest, unsigned long ea, int nb,
282 struct pt_regs *regs)
283 {
284 int err = 0;
285 int c;
286
287 for (; nb > 0; nb -= c) {
288 c = max_align(ea);
289 if (c > nb)
290 c = max_align(nb);
291 switch (c) {
292 case 1:
293 err = __get_user(*dest, (unsigned char __user *) ea);
294 break;
295 case 2:
296 err = __get_user(*(u16 *)dest,
297 (unsigned short __user *) ea);
298 break;
299 case 4:
300 err = __get_user(*(u32 *)dest,
301 (unsigned int __user *) ea);
302 break;
303 #ifdef __powerpc64__
304 case 8:
305 err = __get_user(*(unsigned long *)dest,
306 (unsigned long __user *) ea);
307 break;
308 #endif
309 }
310 if (err) {
311 regs->dar = ea;
312 return err;
313 }
314 dest += c;
315 ea += c;
316 }
317 return 0;
318 }
319
320 static nokprobe_inline int read_mem_unaligned(unsigned long *dest,
321 unsigned long ea, int nb,
322 struct pt_regs *regs)
323 {
324 union {
325 unsigned long ul;
326 u8 b[sizeof(unsigned long)];
327 } u;
328 int i;
329 int err;
330
331 u.ul = 0;
332 i = IS_BE ? sizeof(unsigned long) - nb : 0;
333 err = copy_mem_in(&u.b[i], ea, nb, regs);
334 if (!err)
335 *dest = u.ul;
336 return err;
337 }
338
339 /*
340 * Read memory at address ea for nb bytes, return 0 for success
341 * or -EFAULT if an error occurred. N.B. nb must be 1, 2, 4 or 8.
342 * If nb < sizeof(long), the result is right-justified on BE systems.
343 */
344 static int read_mem(unsigned long *dest, unsigned long ea, int nb,
345 struct pt_regs *regs)
346 {
347 if (!address_ok(regs, ea, nb))
348 return -EFAULT;
349 if ((ea & (nb - 1)) == 0)
350 return read_mem_aligned(dest, ea, nb, regs);
351 return read_mem_unaligned(dest, ea, nb, regs);
352 }
353 NOKPROBE_SYMBOL(read_mem);
354
355 static nokprobe_inline int write_mem_aligned(unsigned long val,
356 unsigned long ea, int nb,
357 struct pt_regs *regs)
358 {
359 int err = 0;
360
361 switch (nb) {
362 case 1:
363 err = __put_user(val, (unsigned char __user *) ea);
364 break;
365 case 2:
366 err = __put_user(val, (unsigned short __user *) ea);
367 break;
368 case 4:
369 err = __put_user(val, (unsigned int __user *) ea);
370 break;
371 #ifdef __powerpc64__
372 case 8:
373 err = __put_user(val, (unsigned long __user *) ea);
374 break;
375 #endif
376 }
377 if (err)
378 regs->dar = ea;
379 return err;
380 }
381
382 /*
383 * Copy from a buffer to userspace, using the largest possible
384 * aligned accesses, up to sizeof(long).
385 */
386 static int nokprobe_inline copy_mem_out(u8 *dest, unsigned long ea, int nb,
387 struct pt_regs *regs)
388 {
389 int err = 0;
390 int c;
391
392 for (; nb > 0; nb -= c) {
393 c = max_align(ea);
394 if (c > nb)
395 c = max_align(nb);
396 switch (c) {
397 case 1:
398 err = __put_user(*dest, (unsigned char __user *) ea);
399 break;
400 case 2:
401 err = __put_user(*(u16 *)dest,
402 (unsigned short __user *) ea);
403 break;
404 case 4:
405 err = __put_user(*(u32 *)dest,
406 (unsigned int __user *) ea);
407 break;
408 #ifdef __powerpc64__
409 case 8:
410 err = __put_user(*(unsigned long *)dest,
411 (unsigned long __user *) ea);
412 break;
413 #endif
414 }
415 if (err) {
416 regs->dar = ea;
417 return err;
418 }
419 dest += c;
420 ea += c;
421 }
422 return 0;
423 }
424
425 static nokprobe_inline int write_mem_unaligned(unsigned long val,
426 unsigned long ea, int nb,
427 struct pt_regs *regs)
428 {
429 union {
430 unsigned long ul;
431 u8 b[sizeof(unsigned long)];
432 } u;
433 int i;
434
435 u.ul = val;
436 i = IS_BE ? sizeof(unsigned long) - nb : 0;
437 return copy_mem_out(&u.b[i], ea, nb, regs);
438 }
439
440 /*
441 * Write memory at address ea for nb bytes, return 0 for success
442 * or -EFAULT if an error occurred. N.B. nb must be 1, 2, 4 or 8.
443 */
444 static int write_mem(unsigned long val, unsigned long ea, int nb,
445 struct pt_regs *regs)
446 {
447 if (!address_ok(regs, ea, nb))
448 return -EFAULT;
449 if ((ea & (nb - 1)) == 0)
450 return write_mem_aligned(val, ea, nb, regs);
451 return write_mem_unaligned(val, ea, nb, regs);
452 }
453 NOKPROBE_SYMBOL(write_mem);
454
455 #ifdef CONFIG_PPC_FPU
456 /*
457 * These access either the real FP register or the image in the
458 * thread_struct, depending on regs->msr & MSR_FP.
459 */
460 static int do_fp_load(struct instruction_op *op, unsigned long ea,
461 struct pt_regs *regs, bool cross_endian)
462 {
463 int err, rn, nb;
464 union {
465 int i;
466 unsigned int u;
467 float f;
468 double d[2];
469 unsigned long l[2];
470 u8 b[2 * sizeof(double)];
471 } u;
472
473 nb = GETSIZE(op->type);
474 if (!address_ok(regs, ea, nb))
475 return -EFAULT;
476 rn = op->reg;
477 err = copy_mem_in(u.b, ea, nb, regs);
478 if (err)
479 return err;
480 if (unlikely(cross_endian)) {
481 do_byte_reverse(u.b, min(nb, 8));
482 if (nb == 16)
483 do_byte_reverse(&u.b[8], 8);
484 }
485 preempt_disable();
486 if (nb == 4) {
487 if (op->type & FPCONV)
488 conv_sp_to_dp(&u.f, &u.d[0]);
489 else if (op->type & SIGNEXT)
490 u.l[0] = u.i;
491 else
492 u.l[0] = u.u;
493 }
494 if (regs->msr & MSR_FP)
495 put_fpr(rn, &u.d[0]);
496 else
497 current->thread.TS_FPR(rn) = u.l[0];
498 if (nb == 16) {
499 /* lfdp */
500 rn |= 1;
501 if (regs->msr & MSR_FP)
502 put_fpr(rn, &u.d[1]);
503 else
504 current->thread.TS_FPR(rn) = u.l[1];
505 }
506 preempt_enable();
507 return 0;
508 }
509 NOKPROBE_SYMBOL(do_fp_load);
510
511 static int do_fp_store(struct instruction_op *op, unsigned long ea,
512 struct pt_regs *regs, bool cross_endian)
513 {
514 int rn, nb;
515 union {
516 unsigned int u;
517 float f;
518 double d[2];
519 unsigned long l[2];
520 u8 b[2 * sizeof(double)];
521 } u;
522
523 nb = GETSIZE(op->type);
524 if (!address_ok(regs, ea, nb))
525 return -EFAULT;
526 rn = op->reg;
527 preempt_disable();
528 if (regs->msr & MSR_FP)
529 get_fpr(rn, &u.d[0]);
530 else
531 u.l[0] = current->thread.TS_FPR(rn);
532 if (nb == 4) {
533 if (op->type & FPCONV)
534 conv_dp_to_sp(&u.d[0], &u.f);
535 else
536 u.u = u.l[0];
537 }
538 if (nb == 16) {
539 rn |= 1;
540 if (regs->msr & MSR_FP)
541 get_fpr(rn, &u.d[1]);
542 else
543 u.l[1] = current->thread.TS_FPR(rn);
544 }
545 preempt_enable();
546 if (unlikely(cross_endian)) {
547 do_byte_reverse(u.b, min(nb, 8));
548 if (nb == 16)
549 do_byte_reverse(&u.b[8], 8);
550 }
551 return copy_mem_out(u.b, ea, nb, regs);
552 }
553 NOKPROBE_SYMBOL(do_fp_store);
554 #endif
555
556 #ifdef CONFIG_ALTIVEC
557 /* For Altivec/VMX, no need to worry about alignment */
558 static nokprobe_inline int do_vec_load(int rn, unsigned long ea,
559 int size, struct pt_regs *regs,
560 bool cross_endian)
561 {
562 int err;
563 union {
564 __vector128 v;
565 u8 b[sizeof(__vector128)];
566 } u = {};
567
568 if (!address_ok(regs, ea & ~0xfUL, 16))
569 return -EFAULT;
570 /* align to multiple of size */
571 ea &= ~(size - 1);
572 err = copy_mem_in(&u.b[ea & 0xf], ea, size, regs);
573 if (err)
574 return err;
575 if (unlikely(cross_endian))
576 do_byte_reverse(&u.b[ea & 0xf], size);
577 preempt_disable();
578 if (regs->msr & MSR_VEC)
579 put_vr(rn, &u.v);
580 else
581 current->thread.vr_state.vr[rn] = u.v;
582 preempt_enable();
583 return 0;
584 }
585
586 static nokprobe_inline int do_vec_store(int rn, unsigned long ea,
587 int size, struct pt_regs *regs,
588 bool cross_endian)
589 {
590 union {
591 __vector128 v;
592 u8 b[sizeof(__vector128)];
593 } u;
594
595 if (!address_ok(regs, ea & ~0xfUL, 16))
596 return -EFAULT;
597 /* align to multiple of size */
598 ea &= ~(size - 1);
599
600 preempt_disable();
601 if (regs->msr & MSR_VEC)
602 get_vr(rn, &u.v);
603 else
604 u.v = current->thread.vr_state.vr[rn];
605 preempt_enable();
606 if (unlikely(cross_endian))
607 do_byte_reverse(&u.b[ea & 0xf], size);
608 return copy_mem_out(&u.b[ea & 0xf], ea, size, regs);
609 }
610 #endif /* CONFIG_ALTIVEC */
611
612 #ifdef __powerpc64__
613 static nokprobe_inline int emulate_lq(struct pt_regs *regs, unsigned long ea,
614 int reg, bool cross_endian)
615 {
616 int err;
617
618 if (!address_ok(regs, ea, 16))
619 return -EFAULT;
620 /* if aligned, should be atomic */
621 if ((ea & 0xf) == 0) {
622 err = do_lq(ea, &regs->gpr[reg]);
623 } else {
624 err = read_mem(&regs->gpr[reg + IS_LE], ea, 8, regs);
625 if (!err)
626 err = read_mem(&regs->gpr[reg + IS_BE], ea + 8, 8, regs);
627 }
628 if (!err && unlikely(cross_endian))
629 do_byte_reverse(&regs->gpr[reg], 16);
630 return err;
631 }
632
633 static nokprobe_inline int emulate_stq(struct pt_regs *regs, unsigned long ea,
634 int reg, bool cross_endian)
635 {
636 int err;
637 unsigned long vals[2];
638
639 if (!address_ok(regs, ea, 16))
640 return -EFAULT;
641 vals[0] = regs->gpr[reg];
642 vals[1] = regs->gpr[reg + 1];
643 if (unlikely(cross_endian))
644 do_byte_reverse(vals, 16);
645
646 /* if aligned, should be atomic */
647 if ((ea & 0xf) == 0)
648 return do_stq(ea, vals[0], vals[1]);
649
650 err = write_mem(vals[IS_LE], ea, 8, regs);
651 if (!err)
652 err = write_mem(vals[IS_BE], ea + 8, 8, regs);
653 return err;
654 }
655 #endif /* __powerpc64 */
656
657 #ifdef CONFIG_VSX
658 void emulate_vsx_load(struct instruction_op *op, union vsx_reg *reg,
659 const void *mem, bool rev)
660 {
661 int size, read_size;
662 int i, j;
663 const unsigned int *wp;
664 const unsigned short *hp;
665 const unsigned char *bp;
666
667 size = GETSIZE(op->type);
668 reg->d[0] = reg->d[1] = 0;
669
670 switch (op->element_size) {
671 case 16:
672 /* whole vector; lxv[x] or lxvl[l] */
673 if (size == 0)
674 break;
675 memcpy(reg, mem, size);
676 if (IS_LE && (op->vsx_flags & VSX_LDLEFT))
677 rev = !rev;
678 if (rev)
679 do_byte_reverse(reg, 16);
680 break;
681 case 8:
682 /* scalar loads, lxvd2x, lxvdsx */
683 read_size = (size >= 8) ? 8 : size;
684 i = IS_LE ? 8 : 8 - read_size;
685 memcpy(&reg->b[i], mem, read_size);
686 if (rev)
687 do_byte_reverse(&reg->b[i], 8);
688 if (size < 8) {
689 if (op->type & SIGNEXT) {
690 /* size == 4 is the only case here */
691 reg->d[IS_LE] = (signed int) reg->d[IS_LE];
692 } else if (op->vsx_flags & VSX_FPCONV) {
693 preempt_disable();
694 conv_sp_to_dp(&reg->fp[1 + IS_LE],
695 &reg->dp[IS_LE]);
696 preempt_enable();
697 }
698 } else {
699 if (size == 16) {
700 unsigned long v = *(unsigned long *)(mem + 8);
701 reg->d[IS_BE] = !rev ? v : byterev_8(v);
702 } else if (op->vsx_flags & VSX_SPLAT)
703 reg->d[IS_BE] = reg->d[IS_LE];
704 }
705 break;
706 case 4:
707 /* lxvw4x, lxvwsx */
708 wp = mem;
709 for (j = 0; j < size / 4; ++j) {
710 i = IS_LE ? 3 - j : j;
711 reg->w[i] = !rev ? *wp++ : byterev_4(*wp++);
712 }
713 if (op->vsx_flags & VSX_SPLAT) {
714 u32 val = reg->w[IS_LE ? 3 : 0];
715 for (; j < 4; ++j) {
716 i = IS_LE ? 3 - j : j;
717 reg->w[i] = val;
718 }
719 }
720 break;
721 case 2:
722 /* lxvh8x */
723 hp = mem;
724 for (j = 0; j < size / 2; ++j) {
725 i = IS_LE ? 7 - j : j;
726 reg->h[i] = !rev ? *hp++ : byterev_2(*hp++);
727 }
728 break;
729 case 1:
730 /* lxvb16x */
731 bp = mem;
732 for (j = 0; j < size; ++j) {
733 i = IS_LE ? 15 - j : j;
734 reg->b[i] = *bp++;
735 }
736 break;
737 }
738 }
739 EXPORT_SYMBOL_GPL(emulate_vsx_load);
740 NOKPROBE_SYMBOL(emulate_vsx_load);
741
742 void emulate_vsx_store(struct instruction_op *op, const union vsx_reg *reg,
743 void *mem, bool rev)
744 {
745 int size, write_size;
746 int i, j;
747 union vsx_reg buf;
748 unsigned int *wp;
749 unsigned short *hp;
750 unsigned char *bp;
751
752 size = GETSIZE(op->type);
753
754 switch (op->element_size) {
755 case 16:
756 /* stxv, stxvx, stxvl, stxvll */
757 if (size == 0)
758 break;
759 if (IS_LE && (op->vsx_flags & VSX_LDLEFT))
760 rev = !rev;
761 if (rev) {
762 /* reverse 16 bytes */
763 buf.d[0] = byterev_8(reg->d[1]);
764 buf.d[1] = byterev_8(reg->d[0]);
765 reg = &buf;
766 }
767 memcpy(mem, reg, size);
768 break;
769 case 8:
770 /* scalar stores, stxvd2x */
771 write_size = (size >= 8) ? 8 : size;
772 i = IS_LE ? 8 : 8 - write_size;
773 if (size < 8 && op->vsx_flags & VSX_FPCONV) {
774 buf.d[0] = buf.d[1] = 0;
775 preempt_disable();
776 conv_dp_to_sp(&reg->dp[IS_LE], &buf.fp[1 + IS_LE]);
777 preempt_enable();
778 reg = &buf;
779 }
780 memcpy(mem, &reg->b[i], write_size);
781 if (size == 16)
782 memcpy(mem + 8, &reg->d[IS_BE], 8);
783 if (unlikely(rev)) {
784 do_byte_reverse(mem, write_size);
785 if (size == 16)
786 do_byte_reverse(mem + 8, 8);
787 }
788 break;
789 case 4:
790 /* stxvw4x */
791 wp = mem;
792 for (j = 0; j < size / 4; ++j) {
793 i = IS_LE ? 3 - j : j;
794 *wp++ = !rev ? reg->w[i] : byterev_4(reg->w[i]);
795 }
796 break;
797 case 2:
798 /* stxvh8x */
799 hp = mem;
800 for (j = 0; j < size / 2; ++j) {
801 i = IS_LE ? 7 - j : j;
802 *hp++ = !rev ? reg->h[i] : byterev_2(reg->h[i]);
803 }
804 break;
805 case 1:
806 /* stvxb16x */
807 bp = mem;
808 for (j = 0; j < size; ++j) {
809 i = IS_LE ? 15 - j : j;
810 *bp++ = reg->b[i];
811 }
812 break;
813 }
814 }
815 EXPORT_SYMBOL_GPL(emulate_vsx_store);
816 NOKPROBE_SYMBOL(emulate_vsx_store);
817
818 static nokprobe_inline int do_vsx_load(struct instruction_op *op,
819 unsigned long ea, struct pt_regs *regs,
820 bool cross_endian)
821 {
822 int reg = op->reg;
823 u8 mem[16];
824 union vsx_reg buf;
825 int size = GETSIZE(op->type);
826
827 if (!address_ok(regs, ea, size) || copy_mem_in(mem, ea, size, regs))
828 return -EFAULT;
829
830 emulate_vsx_load(op, &buf, mem, cross_endian);
831 preempt_disable();
832 if (reg < 32) {
833 /* FP regs + extensions */
834 if (regs->msr & MSR_FP) {
835 load_vsrn(reg, &buf);
836 } else {
837 current->thread.fp_state.fpr[reg][0] = buf.d[0];
838 current->thread.fp_state.fpr[reg][1] = buf.d[1];
839 }
840 } else {
841 if (regs->msr & MSR_VEC)
842 load_vsrn(reg, &buf);
843 else
844 current->thread.vr_state.vr[reg - 32] = buf.v;
845 }
846 preempt_enable();
847 return 0;
848 }
849
850 static nokprobe_inline int do_vsx_store(struct instruction_op *op,
851 unsigned long ea, struct pt_regs *regs,
852 bool cross_endian)
853 {
854 int reg = op->reg;
855 u8 mem[16];
856 union vsx_reg buf;
857 int size = GETSIZE(op->type);
858
859 if (!address_ok(regs, ea, size))
860 return -EFAULT;
861
862 preempt_disable();
863 if (reg < 32) {
864 /* FP regs + extensions */
865 if (regs->msr & MSR_FP) {
866 store_vsrn(reg, &buf);
867 } else {
868 buf.d[0] = current->thread.fp_state.fpr[reg][0];
869 buf.d[1] = current->thread.fp_state.fpr[reg][1];
870 }
871 } else {
872 if (regs->msr & MSR_VEC)
873 store_vsrn(reg, &buf);
874 else
875 buf.v = current->thread.vr_state.vr[reg - 32];
876 }
877 preempt_enable();
878 emulate_vsx_store(op, &buf, mem, cross_endian);
879 return copy_mem_out(mem, ea, size, regs);
880 }
881 #endif /* CONFIG_VSX */
882
883 int emulate_dcbz(unsigned long ea, struct pt_regs *regs)
884 {
885 int err;
886 unsigned long i, size;
887
888 #ifdef __powerpc64__
889 size = ppc64_caches.l1d.block_size;
890 if (!(regs->msr & MSR_64BIT))
891 ea &= 0xffffffffUL;
892 #else
893 size = L1_CACHE_BYTES;
894 #endif
895 ea &= ~(size - 1);
896 if (!address_ok(regs, ea, size))
897 return -EFAULT;
898 for (i = 0; i < size; i += sizeof(long)) {
899 err = __put_user(0, (unsigned long __user *) (ea + i));
900 if (err) {
901 regs->dar = ea;
902 return err;
903 }
904 }
905 return 0;
906 }
907 NOKPROBE_SYMBOL(emulate_dcbz);
908
909 #define __put_user_asmx(x, addr, err, op, cr) \
910 __asm__ __volatile__( \
911 "1: " op " %2,0,%3\n" \
912 " mfcr %1\n" \
913 "2:\n" \
914 ".section .fixup,\"ax\"\n" \
915 "3: li %0,%4\n" \
916 " b 2b\n" \
917 ".previous\n" \
918 EX_TABLE(1b, 3b) \
919 : "=r" (err), "=r" (cr) \
920 : "r" (x), "r" (addr), "i" (-EFAULT), "0" (err))
921
922 #define __get_user_asmx(x, addr, err, op) \
923 __asm__ __volatile__( \
924 "1: "op" %1,0,%2\n" \
925 "2:\n" \
926 ".section .fixup,\"ax\"\n" \
927 "3: li %0,%3\n" \
928 " b 2b\n" \
929 ".previous\n" \
930 EX_TABLE(1b, 3b) \
931 : "=r" (err), "=r" (x) \
932 : "r" (addr), "i" (-EFAULT), "0" (err))
933
934 #define __cacheop_user_asmx(addr, err, op) \
935 __asm__ __volatile__( \
936 "1: "op" 0,%1\n" \
937 "2:\n" \
938 ".section .fixup,\"ax\"\n" \
939 "3: li %0,%3\n" \
940 " b 2b\n" \
941 ".previous\n" \
942 EX_TABLE(1b, 3b) \
943 : "=r" (err) \
944 : "r" (addr), "i" (-EFAULT), "0" (err))
945
946 static nokprobe_inline void set_cr0(const struct pt_regs *regs,
947 struct instruction_op *op, int rd)
948 {
949 long val = regs->gpr[rd];
950
951 op->type |= SETCC;
952 op->ccval = (regs->ccr & 0x0fffffff) | ((regs->xer >> 3) & 0x10000000);
953 #ifdef __powerpc64__
954 if (!(regs->msr & MSR_64BIT))
955 val = (int) val;
956 #endif
957 if (val < 0)
958 op->ccval |= 0x80000000;
959 else if (val > 0)
960 op->ccval |= 0x40000000;
961 else
962 op->ccval |= 0x20000000;
963 }
964
965 static nokprobe_inline void add_with_carry(const struct pt_regs *regs,
966 struct instruction_op *op, int rd,
967 unsigned long val1, unsigned long val2,
968 unsigned long carry_in)
969 {
970 unsigned long val = val1 + val2;
971
972 if (carry_in)
973 ++val;
974 op->type = COMPUTE + SETREG + SETXER;
975 op->reg = rd;
976 op->val = val;
977 #ifdef __powerpc64__
978 if (!(regs->msr & MSR_64BIT)) {
979 val = (unsigned int) val;
980 val1 = (unsigned int) val1;
981 }
982 #endif
983 op->xerval = regs->xer;
984 if (val < val1 || (carry_in && val == val1))
985 op->xerval |= XER_CA;
986 else
987 op->xerval &= ~XER_CA;
988 }
989
990 static nokprobe_inline void do_cmp_signed(const struct pt_regs *regs,
991 struct instruction_op *op,
992 long v1, long v2, int crfld)
993 {
994 unsigned int crval, shift;
995
996 op->type = COMPUTE + SETCC;
997 crval = (regs->xer >> 31) & 1; /* get SO bit */
998 if (v1 < v2)
999 crval |= 8;
1000 else if (v1 > v2)
1001 crval |= 4;
1002 else
1003 crval |= 2;
1004 shift = (7 - crfld) * 4;
1005 op->ccval = (regs->ccr & ~(0xf << shift)) | (crval << shift);
1006 }
1007
1008 static nokprobe_inline void do_cmp_unsigned(const struct pt_regs *regs,
1009 struct instruction_op *op,
1010 unsigned long v1,
1011 unsigned long v2, int crfld)
1012 {
1013 unsigned int crval, shift;
1014
1015 op->type = COMPUTE + SETCC;
1016 crval = (regs->xer >> 31) & 1; /* get SO bit */
1017 if (v1 < v2)
1018 crval |= 8;
1019 else if (v1 > v2)
1020 crval |= 4;
1021 else
1022 crval |= 2;
1023 shift = (7 - crfld) * 4;
1024 op->ccval = (regs->ccr & ~(0xf << shift)) | (crval << shift);
1025 }
1026
1027 static nokprobe_inline void do_cmpb(const struct pt_regs *regs,
1028 struct instruction_op *op,
1029 unsigned long v1, unsigned long v2)
1030 {
1031 unsigned long long out_val, mask;
1032 int i;
1033
1034 out_val = 0;
1035 for (i = 0; i < 8; i++) {
1036 mask = 0xffUL << (i * 8);
1037 if ((v1 & mask) == (v2 & mask))
1038 out_val |= mask;
1039 }
1040 op->val = out_val;
1041 }
1042
1043 /*
1044 * The size parameter is used to adjust the equivalent popcnt instruction.
1045 * popcntb = 8, popcntw = 32, popcntd = 64
1046 */
1047 static nokprobe_inline void do_popcnt(const struct pt_regs *regs,
1048 struct instruction_op *op,
1049 unsigned long v1, int size)
1050 {
1051 unsigned long long out = v1;
1052
1053 out -= (out >> 1) & 0x5555555555555555;
1054 out = (0x3333333333333333 & out) + (0x3333333333333333 & (out >> 2));
1055 out = (out + (out >> 4)) & 0x0f0f0f0f0f0f0f0f;
1056
1057 if (size == 8) { /* popcntb */
1058 op->val = out;
1059 return;
1060 }
1061 out += out >> 8;
1062 out += out >> 16;
1063 if (size == 32) { /* popcntw */
1064 op->val = out & 0x0000003f0000003f;
1065 return;
1066 }
1067
1068 out = (out + (out >> 32)) & 0x7f;
1069 op->val = out; /* popcntd */
1070 }
1071
1072 #ifdef CONFIG_PPC64
1073 static nokprobe_inline void do_bpermd(const struct pt_regs *regs,
1074 struct instruction_op *op,
1075 unsigned long v1, unsigned long v2)
1076 {
1077 unsigned char perm, idx;
1078 unsigned int i;
1079
1080 perm = 0;
1081 for (i = 0; i < 8; i++) {
1082 idx = (v1 >> (i * 8)) & 0xff;
1083 if (idx < 64)
1084 if (v2 & PPC_BIT(idx))
1085 perm |= 1 << i;
1086 }
1087 op->val = perm;
1088 }
1089 #endif /* CONFIG_PPC64 */
1090 /*
1091 * The size parameter adjusts the equivalent prty instruction.
1092 * prtyw = 32, prtyd = 64
1093 */
1094 static nokprobe_inline void do_prty(const struct pt_regs *regs,
1095 struct instruction_op *op,
1096 unsigned long v, int size)
1097 {
1098 unsigned long long res = v ^ (v >> 8);
1099
1100 res ^= res >> 16;
1101 if (size == 32) { /* prtyw */
1102 op->val = res & 0x0000000100000001;
1103 return;
1104 }
1105
1106 res ^= res >> 32;
1107 op->val = res & 1; /*prtyd */
1108 }
1109
1110 static nokprobe_inline int trap_compare(long v1, long v2)
1111 {
1112 int ret = 0;
1113
1114 if (v1 < v2)
1115 ret |= 0x10;
1116 else if (v1 > v2)
1117 ret |= 0x08;
1118 else
1119 ret |= 0x04;
1120 if ((unsigned long)v1 < (unsigned long)v2)
1121 ret |= 0x02;
1122 else if ((unsigned long)v1 > (unsigned long)v2)
1123 ret |= 0x01;
1124 return ret;
1125 }
1126
1127 /*
1128 * Elements of 32-bit rotate and mask instructions.
1129 */
1130 #define MASK32(mb, me) ((0xffffffffUL >> (mb)) + \
1131 ((signed long)-0x80000000L >> (me)) + ((me) >= (mb)))
1132 #ifdef __powerpc64__
1133 #define MASK64_L(mb) (~0UL >> (mb))
1134 #define MASK64_R(me) ((signed long)-0x8000000000000000L >> (me))
1135 #define MASK64(mb, me) (MASK64_L(mb) + MASK64_R(me) + ((me) >= (mb)))
1136 #define DATA32(x) (((x) & 0xffffffffUL) | (((x) & 0xffffffffUL) << 32))
1137 #else
1138 #define DATA32(x) (x)
1139 #endif
1140 #define ROTATE(x, n) ((n) ? (((x) << (n)) | ((x) >> (8 * sizeof(long) - (n)))) : (x))
1141
1142 /*
1143 * Decode an instruction, and return information about it in *op
1144 * without changing *regs.
1145 * Integer arithmetic and logical instructions, branches, and barrier
1146 * instructions can be emulated just using the information in *op.
1147 *
1148 * Return value is 1 if the instruction can be emulated just by
1149 * updating *regs with the information in *op, -1 if we need the
1150 * GPRs but *regs doesn't contain the full register set, or 0
1151 * otherwise.
1152 */
1153 int analyse_instr(struct instruction_op *op, const struct pt_regs *regs,
1154 unsigned int instr)
1155 {
1156 unsigned int opcode, ra, rb, rd, spr, u;
1157 unsigned long int imm;
1158 unsigned long int val, val2;
1159 unsigned int mb, me, sh;
1160 long ival;
1161
1162 op->type = COMPUTE;
1163
1164 opcode = instr >> 26;
1165 switch (opcode) {
1166 case 16: /* bc */
1167 op->type = BRANCH;
1168 imm = (signed short)(instr & 0xfffc);
1169 if ((instr & 2) == 0)
1170 imm += regs->nip;
1171 op->val = truncate_if_32bit(regs->msr, imm);
1172 if (instr & 1)
1173 op->type |= SETLK;
1174 if (branch_taken(instr, regs, op))
1175 op->type |= BRTAKEN;
1176 return 1;
1177 #ifdef CONFIG_PPC64
1178 case 17: /* sc */
1179 if ((instr & 0xfe2) == 2)
1180 op->type = SYSCALL;
1181 else
1182 op->type = UNKNOWN;
1183 return 0;
1184 #endif
1185 case 18: /* b */
1186 op->type = BRANCH | BRTAKEN;
1187 imm = instr & 0x03fffffc;
1188 if (imm & 0x02000000)
1189 imm -= 0x04000000;
1190 if ((instr & 2) == 0)
1191 imm += regs->nip;
1192 op->val = truncate_if_32bit(regs->msr, imm);
1193 if (instr & 1)
1194 op->type |= SETLK;
1195 return 1;
1196 case 19:
1197 switch ((instr >> 1) & 0x3ff) {
1198 case 0: /* mcrf */
1199 op->type = COMPUTE + SETCC;
1200 rd = 7 - ((instr >> 23) & 0x7);
1201 ra = 7 - ((instr >> 18) & 0x7);
1202 rd *= 4;
1203 ra *= 4;
1204 val = (regs->ccr >> ra) & 0xf;
1205 op->ccval = (regs->ccr & ~(0xfUL << rd)) | (val << rd);
1206 return 1;
1207
1208 case 16: /* bclr */
1209 case 528: /* bcctr */
1210 op->type = BRANCH;
1211 imm = (instr & 0x400)? regs->ctr: regs->link;
1212 op->val = truncate_if_32bit(regs->msr, imm);
1213 if (instr & 1)
1214 op->type |= SETLK;
1215 if (branch_taken(instr, regs, op))
1216 op->type |= BRTAKEN;
1217 return 1;
1218
1219 case 18: /* rfid, scary */
1220 if (regs->msr & MSR_PR)
1221 goto priv;
1222 op->type = RFI;
1223 return 0;
1224
1225 case 150: /* isync */
1226 op->type = BARRIER | BARRIER_ISYNC;
1227 return 1;
1228
1229 case 33: /* crnor */
1230 case 129: /* crandc */
1231 case 193: /* crxor */
1232 case 225: /* crnand */
1233 case 257: /* crand */
1234 case 289: /* creqv */
1235 case 417: /* crorc */
1236 case 449: /* cror */
1237 op->type = COMPUTE + SETCC;
1238 ra = (instr >> 16) & 0x1f;
1239 rb = (instr >> 11) & 0x1f;
1240 rd = (instr >> 21) & 0x1f;
1241 ra = (regs->ccr >> (31 - ra)) & 1;
1242 rb = (regs->ccr >> (31 - rb)) & 1;
1243 val = (instr >> (6 + ra * 2 + rb)) & 1;
1244 op->ccval = (regs->ccr & ~(1UL << (31 - rd))) |
1245 (val << (31 - rd));
1246 return 1;
1247 }
1248 break;
1249 case 31:
1250 switch ((instr >> 1) & 0x3ff) {
1251 case 598: /* sync */
1252 op->type = BARRIER + BARRIER_SYNC;
1253 #ifdef __powerpc64__
1254 switch ((instr >> 21) & 3) {
1255 case 1: /* lwsync */
1256 op->type = BARRIER + BARRIER_LWSYNC;
1257 break;
1258 case 2: /* ptesync */
1259 op->type = BARRIER + BARRIER_PTESYNC;
1260 break;
1261 }
1262 #endif
1263 return 1;
1264
1265 case 854: /* eieio */
1266 op->type = BARRIER + BARRIER_EIEIO;
1267 return 1;
1268 }
1269 break;
1270 }
1271
1272 /* Following cases refer to regs->gpr[], so we need all regs */
1273 if (!FULL_REGS(regs))
1274 return -1;
1275
1276 rd = (instr >> 21) & 0x1f;
1277 ra = (instr >> 16) & 0x1f;
1278 rb = (instr >> 11) & 0x1f;
1279
1280 switch (opcode) {
1281 #ifdef __powerpc64__
1282 case 2: /* tdi */
1283 if (rd & trap_compare(regs->gpr[ra], (short) instr))
1284 goto trap;
1285 return 1;
1286 #endif
1287 case 3: /* twi */
1288 if (rd & trap_compare((int)regs->gpr[ra], (short) instr))
1289 goto trap;
1290 return 1;
1291
1292 case 7: /* mulli */
1293 op->val = regs->gpr[ra] * (short) instr;
1294 goto compute_done;
1295
1296 case 8: /* subfic */
1297 imm = (short) instr;
1298 add_with_carry(regs, op, rd, ~regs->gpr[ra], imm, 1);
1299 return 1;
1300
1301 case 10: /* cmpli */
1302 imm = (unsigned short) instr;
1303 val = regs->gpr[ra];
1304 #ifdef __powerpc64__
1305 if ((rd & 1) == 0)
1306 val = (unsigned int) val;
1307 #endif
1308 do_cmp_unsigned(regs, op, val, imm, rd >> 2);
1309 return 1;
1310
1311 case 11: /* cmpi */
1312 imm = (short) instr;
1313 val = regs->gpr[ra];
1314 #ifdef __powerpc64__
1315 if ((rd & 1) == 0)
1316 val = (int) val;
1317 #endif
1318 do_cmp_signed(regs, op, val, imm, rd >> 2);
1319 return 1;
1320
1321 case 12: /* addic */
1322 imm = (short) instr;
1323 add_with_carry(regs, op, rd, regs->gpr[ra], imm, 0);
1324 return 1;
1325
1326 case 13: /* addic. */
1327 imm = (short) instr;
1328 add_with_carry(regs, op, rd, regs->gpr[ra], imm, 0);
1329 set_cr0(regs, op, rd);
1330 return 1;
1331
1332 case 14: /* addi */
1333 imm = (short) instr;
1334 if (ra)
1335 imm += regs->gpr[ra];
1336 op->val = imm;
1337 goto compute_done;
1338
1339 case 15: /* addis */
1340 imm = ((short) instr) << 16;
1341 if (ra)
1342 imm += regs->gpr[ra];
1343 op->val = imm;
1344 goto compute_done;
1345
1346 case 19:
1347 if (((instr >> 1) & 0x1f) == 2) {
1348 /* addpcis */
1349 imm = (short) (instr & 0xffc1); /* d0 + d2 fields */
1350 imm |= (instr >> 15) & 0x3e; /* d1 field */
1351 op->val = regs->nip + (imm << 16) + 4;
1352 goto compute_done;
1353 }
1354 op->type = UNKNOWN;
1355 return 0;
1356
1357 case 20: /* rlwimi */
1358 mb = (instr >> 6) & 0x1f;
1359 me = (instr >> 1) & 0x1f;
1360 val = DATA32(regs->gpr[rd]);
1361 imm = MASK32(mb, me);
1362 op->val = (regs->gpr[ra] & ~imm) | (ROTATE(val, rb) & imm);
1363 goto logical_done;
1364
1365 case 21: /* rlwinm */
1366 mb = (instr >> 6) & 0x1f;
1367 me = (instr >> 1) & 0x1f;
1368 val = DATA32(regs->gpr[rd]);
1369 op->val = ROTATE(val, rb) & MASK32(mb, me);
1370 goto logical_done;
1371
1372 case 23: /* rlwnm */
1373 mb = (instr >> 6) & 0x1f;
1374 me = (instr >> 1) & 0x1f;
1375 rb = regs->gpr[rb] & 0x1f;
1376 val = DATA32(regs->gpr[rd]);
1377 op->val = ROTATE(val, rb) & MASK32(mb, me);
1378 goto logical_done;
1379
1380 case 24: /* ori */
1381 op->val = regs->gpr[rd] | (unsigned short) instr;
1382 goto logical_done_nocc;
1383
1384 case 25: /* oris */
1385 imm = (unsigned short) instr;
1386 op->val = regs->gpr[rd] | (imm << 16);
1387 goto logical_done_nocc;
1388
1389 case 26: /* xori */
1390 op->val = regs->gpr[rd] ^ (unsigned short) instr;
1391 goto logical_done_nocc;
1392
1393 case 27: /* xoris */
1394 imm = (unsigned short) instr;
1395 op->val = regs->gpr[rd] ^ (imm << 16);
1396 goto logical_done_nocc;
1397
1398 case 28: /* andi. */
1399 op->val = regs->gpr[rd] & (unsigned short) instr;
1400 set_cr0(regs, op, ra);
1401 goto logical_done_nocc;
1402
1403 case 29: /* andis. */
1404 imm = (unsigned short) instr;
1405 op->val = regs->gpr[rd] & (imm << 16);
1406 set_cr0(regs, op, ra);
1407 goto logical_done_nocc;
1408
1409 #ifdef __powerpc64__
1410 case 30: /* rld* */
1411 mb = ((instr >> 6) & 0x1f) | (instr & 0x20);
1412 val = regs->gpr[rd];
1413 if ((instr & 0x10) == 0) {
1414 sh = rb | ((instr & 2) << 4);
1415 val = ROTATE(val, sh);
1416 switch ((instr >> 2) & 3) {
1417 case 0: /* rldicl */
1418 val &= MASK64_L(mb);
1419 break;
1420 case 1: /* rldicr */
1421 val &= MASK64_R(mb);
1422 break;
1423 case 2: /* rldic */
1424 val &= MASK64(mb, 63 - sh);
1425 break;
1426 case 3: /* rldimi */
1427 imm = MASK64(mb, 63 - sh);
1428 val = (regs->gpr[ra] & ~imm) |
1429 (val & imm);
1430 }
1431 op->val = val;
1432 goto logical_done;
1433 } else {
1434 sh = regs->gpr[rb] & 0x3f;
1435 val = ROTATE(val, sh);
1436 switch ((instr >> 1) & 7) {
1437 case 0: /* rldcl */
1438 op->val = val & MASK64_L(mb);
1439 goto logical_done;
1440 case 1: /* rldcr */
1441 op->val = val & MASK64_R(mb);
1442 goto logical_done;
1443 }
1444 }
1445 #endif
1446 op->type = UNKNOWN; /* illegal instruction */
1447 return 0;
1448
1449 case 31:
1450 /* isel occupies 32 minor opcodes */
1451 if (((instr >> 1) & 0x1f) == 15) {
1452 mb = (instr >> 6) & 0x1f; /* bc field */
1453 val = (regs->ccr >> (31 - mb)) & 1;
1454 val2 = (ra) ? regs->gpr[ra] : 0;
1455
1456 op->val = (val) ? val2 : regs->gpr[rb];
1457 goto compute_done;
1458 }
1459
1460 switch ((instr >> 1) & 0x3ff) {
1461 case 4: /* tw */
1462 if (rd == 0x1f ||
1463 (rd & trap_compare((int)regs->gpr[ra],
1464 (int)regs->gpr[rb])))
1465 goto trap;
1466 return 1;
1467 #ifdef __powerpc64__
1468 case 68: /* td */
1469 if (rd & trap_compare(regs->gpr[ra], regs->gpr[rb]))
1470 goto trap;
1471 return 1;
1472 #endif
1473 case 83: /* mfmsr */
1474 if (regs->msr & MSR_PR)
1475 goto priv;
1476 op->type = MFMSR;
1477 op->reg = rd;
1478 return 0;
1479 case 146: /* mtmsr */
1480 if (regs->msr & MSR_PR)
1481 goto priv;
1482 op->type = MTMSR;
1483 op->reg = rd;
1484 op->val = 0xffffffff & ~(MSR_ME | MSR_LE);
1485 return 0;
1486 #ifdef CONFIG_PPC64
1487 case 178: /* mtmsrd */
1488 if (regs->msr & MSR_PR)
1489 goto priv;
1490 op->type = MTMSR;
1491 op->reg = rd;
1492 /* only MSR_EE and MSR_RI get changed if bit 15 set */
1493 /* mtmsrd doesn't change MSR_HV, MSR_ME or MSR_LE */
1494 imm = (instr & 0x10000)? 0x8002: 0xefffffffffffeffeUL;
1495 op->val = imm;
1496 return 0;
1497 #endif
1498
1499 case 19: /* mfcr */
1500 imm = 0xffffffffUL;
1501 if ((instr >> 20) & 1) {
1502 imm = 0xf0000000UL;
1503 for (sh = 0; sh < 8; ++sh) {
1504 if (instr & (0x80000 >> sh))
1505 break;
1506 imm >>= 4;
1507 }
1508 }
1509 op->val = regs->ccr & imm;
1510 goto compute_done;
1511
1512 case 144: /* mtcrf */
1513 op->type = COMPUTE + SETCC;
1514 imm = 0xf0000000UL;
1515 val = regs->gpr[rd];
1516 op->val = regs->ccr;
1517 for (sh = 0; sh < 8; ++sh) {
1518 if (instr & (0x80000 >> sh))
1519 op->val = (op->val & ~imm) |
1520 (val & imm);
1521 imm >>= 4;
1522 }
1523 return 1;
1524
1525 case 339: /* mfspr */
1526 spr = ((instr >> 16) & 0x1f) | ((instr >> 6) & 0x3e0);
1527 op->type = MFSPR;
1528 op->reg = rd;
1529 op->spr = spr;
1530 if (spr == SPRN_XER || spr == SPRN_LR ||
1531 spr == SPRN_CTR)
1532 return 1;
1533 return 0;
1534
1535 case 467: /* mtspr */
1536 spr = ((instr >> 16) & 0x1f) | ((instr >> 6) & 0x3e0);
1537 op->type = MTSPR;
1538 op->val = regs->gpr[rd];
1539 op->spr = spr;
1540 if (spr == SPRN_XER || spr == SPRN_LR ||
1541 spr == SPRN_CTR)
1542 return 1;
1543 return 0;
1544
1545 /*
1546 * Compare instructions
1547 */
1548 case 0: /* cmp */
1549 val = regs->gpr[ra];
1550 val2 = regs->gpr[rb];
1551 #ifdef __powerpc64__
1552 if ((rd & 1) == 0) {
1553 /* word (32-bit) compare */
1554 val = (int) val;
1555 val2 = (int) val2;
1556 }
1557 #endif
1558 do_cmp_signed(regs, op, val, val2, rd >> 2);
1559 return 1;
1560
1561 case 32: /* cmpl */
1562 val = regs->gpr[ra];
1563 val2 = regs->gpr[rb];
1564 #ifdef __powerpc64__
1565 if ((rd & 1) == 0) {
1566 /* word (32-bit) compare */
1567 val = (unsigned int) val;
1568 val2 = (unsigned int) val2;
1569 }
1570 #endif
1571 do_cmp_unsigned(regs, op, val, val2, rd >> 2);
1572 return 1;
1573
1574 case 508: /* cmpb */
1575 do_cmpb(regs, op, regs->gpr[rd], regs->gpr[rb]);
1576 goto logical_done_nocc;
1577
1578 /*
1579 * Arithmetic instructions
1580 */
1581 case 8: /* subfc */
1582 add_with_carry(regs, op, rd, ~regs->gpr[ra],
1583 regs->gpr[rb], 1);
1584 goto arith_done;
1585 #ifdef __powerpc64__
1586 case 9: /* mulhdu */
1587 asm("mulhdu %0,%1,%2" : "=r" (op->val) :
1588 "r" (regs->gpr[ra]), "r" (regs->gpr[rb]));
1589 goto arith_done;
1590 #endif
1591 case 10: /* addc */
1592 add_with_carry(regs, op, rd, regs->gpr[ra],
1593 regs->gpr[rb], 0);
1594 goto arith_done;
1595
1596 case 11: /* mulhwu */
1597 asm("mulhwu %0,%1,%2" : "=r" (op->val) :
1598 "r" (regs->gpr[ra]), "r" (regs->gpr[rb]));
1599 goto arith_done;
1600
1601 case 40: /* subf */
1602 op->val = regs->gpr[rb] - regs->gpr[ra];
1603 goto arith_done;
1604 #ifdef __powerpc64__
1605 case 73: /* mulhd */
1606 asm("mulhd %0,%1,%2" : "=r" (op->val) :
1607 "r" (regs->gpr[ra]), "r" (regs->gpr[rb]));
1608 goto arith_done;
1609 #endif
1610 case 75: /* mulhw */
1611 asm("mulhw %0,%1,%2" : "=r" (op->val) :
1612 "r" (regs->gpr[ra]), "r" (regs->gpr[rb]));
1613 goto arith_done;
1614
1615 case 104: /* neg */
1616 op->val = -regs->gpr[ra];
1617 goto arith_done;
1618
1619 case 136: /* subfe */
1620 add_with_carry(regs, op, rd, ~regs->gpr[ra],
1621 regs->gpr[rb], regs->xer & XER_CA);
1622 goto arith_done;
1623
1624 case 138: /* adde */
1625 add_with_carry(regs, op, rd, regs->gpr[ra],
1626 regs->gpr[rb], regs->xer & XER_CA);
1627 goto arith_done;
1628
1629 case 200: /* subfze */
1630 add_with_carry(regs, op, rd, ~regs->gpr[ra], 0L,
1631 regs->xer & XER_CA);
1632 goto arith_done;
1633
1634 case 202: /* addze */
1635 add_with_carry(regs, op, rd, regs->gpr[ra], 0L,
1636 regs->xer & XER_CA);
1637 goto arith_done;
1638
1639 case 232: /* subfme */
1640 add_with_carry(regs, op, rd, ~regs->gpr[ra], -1L,
1641 regs->xer & XER_CA);
1642 goto arith_done;
1643 #ifdef __powerpc64__
1644 case 233: /* mulld */
1645 op->val = regs->gpr[ra] * regs->gpr[rb];
1646 goto arith_done;
1647 #endif
1648 case 234: /* addme */
1649 add_with_carry(regs, op, rd, regs->gpr[ra], -1L,
1650 regs->xer & XER_CA);
1651 goto arith_done;
1652
1653 case 235: /* mullw */
1654 op->val = (unsigned int) regs->gpr[ra] *
1655 (unsigned int) regs->gpr[rb];
1656 goto arith_done;
1657
1658 case 266: /* add */
1659 op->val = regs->gpr[ra] + regs->gpr[rb];
1660 goto arith_done;
1661 #ifdef __powerpc64__
1662 case 457: /* divdu */
1663 op->val = regs->gpr[ra] / regs->gpr[rb];
1664 goto arith_done;
1665 #endif
1666 case 459: /* divwu */
1667 op->val = (unsigned int) regs->gpr[ra] /
1668 (unsigned int) regs->gpr[rb];
1669 goto arith_done;
1670 #ifdef __powerpc64__
1671 case 489: /* divd */
1672 op->val = (long int) regs->gpr[ra] /
1673 (long int) regs->gpr[rb];
1674 goto arith_done;
1675 #endif
1676 case 491: /* divw */
1677 op->val = (int) regs->gpr[ra] /
1678 (int) regs->gpr[rb];
1679 goto arith_done;
1680
1681
1682 /*
1683 * Logical instructions
1684 */
1685 case 26: /* cntlzw */
1686 op->val = __builtin_clz((unsigned int) regs->gpr[rd]);
1687 goto logical_done;
1688 #ifdef __powerpc64__
1689 case 58: /* cntlzd */
1690 op->val = __builtin_clzl(regs->gpr[rd]);
1691 goto logical_done;
1692 #endif
1693 case 28: /* and */
1694 op->val = regs->gpr[rd] & regs->gpr[rb];
1695 goto logical_done;
1696
1697 case 60: /* andc */
1698 op->val = regs->gpr[rd] & ~regs->gpr[rb];
1699 goto logical_done;
1700
1701 case 122: /* popcntb */
1702 do_popcnt(regs, op, regs->gpr[rd], 8);
1703 goto logical_done_nocc;
1704
1705 case 124: /* nor */
1706 op->val = ~(regs->gpr[rd] | regs->gpr[rb]);
1707 goto logical_done;
1708
1709 case 154: /* prtyw */
1710 do_prty(regs, op, regs->gpr[rd], 32);
1711 goto logical_done_nocc;
1712
1713 case 186: /* prtyd */
1714 do_prty(regs, op, regs->gpr[rd], 64);
1715 goto logical_done_nocc;
1716 #ifdef CONFIG_PPC64
1717 case 252: /* bpermd */
1718 do_bpermd(regs, op, regs->gpr[rd], regs->gpr[rb]);
1719 goto logical_done_nocc;
1720 #endif
1721 case 284: /* xor */
1722 op->val = ~(regs->gpr[rd] ^ regs->gpr[rb]);
1723 goto logical_done;
1724
1725 case 316: /* xor */
1726 op->val = regs->gpr[rd] ^ regs->gpr[rb];
1727 goto logical_done;
1728
1729 case 378: /* popcntw */
1730 do_popcnt(regs, op, regs->gpr[rd], 32);
1731 goto logical_done_nocc;
1732
1733 case 412: /* orc */
1734 op->val = regs->gpr[rd] | ~regs->gpr[rb];
1735 goto logical_done;
1736
1737 case 444: /* or */
1738 op->val = regs->gpr[rd] | regs->gpr[rb];
1739 goto logical_done;
1740
1741 case 476: /* nand */
1742 op->val = ~(regs->gpr[rd] & regs->gpr[rb]);
1743 goto logical_done;
1744 #ifdef CONFIG_PPC64
1745 case 506: /* popcntd */
1746 do_popcnt(regs, op, regs->gpr[rd], 64);
1747 goto logical_done_nocc;
1748 #endif
1749 case 922: /* extsh */
1750 op->val = (signed short) regs->gpr[rd];
1751 goto logical_done;
1752
1753 case 954: /* extsb */
1754 op->val = (signed char) regs->gpr[rd];
1755 goto logical_done;
1756 #ifdef __powerpc64__
1757 case 986: /* extsw */
1758 op->val = (signed int) regs->gpr[rd];
1759 goto logical_done;
1760 #endif
1761
1762 /*
1763 * Shift instructions
1764 */
1765 case 24: /* slw */
1766 sh = regs->gpr[rb] & 0x3f;
1767 if (sh < 32)
1768 op->val = (regs->gpr[rd] << sh) & 0xffffffffUL;
1769 else
1770 op->val = 0;
1771 goto logical_done;
1772
1773 case 536: /* srw */
1774 sh = regs->gpr[rb] & 0x3f;
1775 if (sh < 32)
1776 op->val = (regs->gpr[rd] & 0xffffffffUL) >> sh;
1777 else
1778 op->val = 0;
1779 goto logical_done;
1780
1781 case 792: /* sraw */
1782 op->type = COMPUTE + SETREG + SETXER;
1783 sh = regs->gpr[rb] & 0x3f;
1784 ival = (signed int) regs->gpr[rd];
1785 op->val = ival >> (sh < 32 ? sh : 31);
1786 op->xerval = regs->xer;
1787 if (ival < 0 && (sh >= 32 || (ival & ((1ul << sh) - 1)) != 0))
1788 op->xerval |= XER_CA;
1789 else
1790 op->xerval &= ~XER_CA;
1791 goto logical_done;
1792
1793 case 824: /* srawi */
1794 op->type = COMPUTE + SETREG + SETXER;
1795 sh = rb;
1796 ival = (signed int) regs->gpr[rd];
1797 op->val = ival >> sh;
1798 op->xerval = regs->xer;
1799 if (ival < 0 && (ival & ((1ul << sh) - 1)) != 0)
1800 op->xerval |= XER_CA;
1801 else
1802 op->xerval &= ~XER_CA;
1803 goto logical_done;
1804
1805 #ifdef __powerpc64__
1806 case 27: /* sld */
1807 sh = regs->gpr[rb] & 0x7f;
1808 if (sh < 64)
1809 op->val = regs->gpr[rd] << sh;
1810 else
1811 op->val = 0;
1812 goto logical_done;
1813
1814 case 539: /* srd */
1815 sh = regs->gpr[rb] & 0x7f;
1816 if (sh < 64)
1817 op->val = regs->gpr[rd] >> sh;
1818 else
1819 op->val = 0;
1820 goto logical_done;
1821
1822 case 794: /* srad */
1823 op->type = COMPUTE + SETREG + SETXER;
1824 sh = regs->gpr[rb] & 0x7f;
1825 ival = (signed long int) regs->gpr[rd];
1826 op->val = ival >> (sh < 64 ? sh : 63);
1827 op->xerval = regs->xer;
1828 if (ival < 0 && (sh >= 64 || (ival & ((1ul << sh) - 1)) != 0))
1829 op->xerval |= XER_CA;
1830 else
1831 op->xerval &= ~XER_CA;
1832 goto logical_done;
1833
1834 case 826: /* sradi with sh_5 = 0 */
1835 case 827: /* sradi with sh_5 = 1 */
1836 op->type = COMPUTE + SETREG + SETXER;
1837 sh = rb | ((instr & 2) << 4);
1838 ival = (signed long int) regs->gpr[rd];
1839 op->val = ival >> sh;
1840 op->xerval = regs->xer;
1841 if (ival < 0 && (ival & ((1ul << sh) - 1)) != 0)
1842 op->xerval |= XER_CA;
1843 else
1844 op->xerval &= ~XER_CA;
1845 goto logical_done;
1846 #endif /* __powerpc64__ */
1847
1848 /*
1849 * Cache instructions
1850 */
1851 case 54: /* dcbst */
1852 op->type = MKOP(CACHEOP, DCBST, 0);
1853 op->ea = xform_ea(instr, regs);
1854 return 0;
1855
1856 case 86: /* dcbf */
1857 op->type = MKOP(CACHEOP, DCBF, 0);
1858 op->ea = xform_ea(instr, regs);
1859 return 0;
1860
1861 case 246: /* dcbtst */
1862 op->type = MKOP(CACHEOP, DCBTST, 0);
1863 op->ea = xform_ea(instr, regs);
1864 op->reg = rd;
1865 return 0;
1866
1867 case 278: /* dcbt */
1868 op->type = MKOP(CACHEOP, DCBTST, 0);
1869 op->ea = xform_ea(instr, regs);
1870 op->reg = rd;
1871 return 0;
1872
1873 case 982: /* icbi */
1874 op->type = MKOP(CACHEOP, ICBI, 0);
1875 op->ea = xform_ea(instr, regs);
1876 return 0;
1877
1878 case 1014: /* dcbz */
1879 op->type = MKOP(CACHEOP, DCBZ, 0);
1880 op->ea = xform_ea(instr, regs);
1881 return 0;
1882 }
1883 break;
1884 }
1885
1886 /*
1887 * Loads and stores.
1888 */
1889 op->type = UNKNOWN;
1890 op->update_reg = ra;
1891 op->reg = rd;
1892 op->val = regs->gpr[rd];
1893 u = (instr >> 20) & UPDATE;
1894 op->vsx_flags = 0;
1895
1896 switch (opcode) {
1897 case 31:
1898 u = instr & UPDATE;
1899 op->ea = xform_ea(instr, regs);
1900 switch ((instr >> 1) & 0x3ff) {
1901 case 20: /* lwarx */
1902 op->type = MKOP(LARX, 0, 4);
1903 break;
1904
1905 case 150: /* stwcx. */
1906 op->type = MKOP(STCX, 0, 4);
1907 break;
1908
1909 #ifdef __powerpc64__
1910 case 84: /* ldarx */
1911 op->type = MKOP(LARX, 0, 8);
1912 break;
1913
1914 case 214: /* stdcx. */
1915 op->type = MKOP(STCX, 0, 8);
1916 break;
1917
1918 case 52: /* lbarx */
1919 op->type = MKOP(LARX, 0, 1);
1920 break;
1921
1922 case 694: /* stbcx. */
1923 op->type = MKOP(STCX, 0, 1);
1924 break;
1925
1926 case 116: /* lharx */
1927 op->type = MKOP(LARX, 0, 2);
1928 break;
1929
1930 case 726: /* sthcx. */
1931 op->type = MKOP(STCX, 0, 2);
1932 break;
1933
1934 case 276: /* lqarx */
1935 if (!((rd & 1) || rd == ra || rd == rb))
1936 op->type = MKOP(LARX, 0, 16);
1937 break;
1938
1939 case 182: /* stqcx. */
1940 if (!(rd & 1))
1941 op->type = MKOP(STCX, 0, 16);
1942 break;
1943 #endif
1944
1945 case 23: /* lwzx */
1946 case 55: /* lwzux */
1947 op->type = MKOP(LOAD, u, 4);
1948 break;
1949
1950 case 87: /* lbzx */
1951 case 119: /* lbzux */
1952 op->type = MKOP(LOAD, u, 1);
1953 break;
1954
1955 #ifdef CONFIG_ALTIVEC
1956 /*
1957 * Note: for the load/store vector element instructions,
1958 * bits of the EA say which field of the VMX register to use.
1959 */
1960 case 7: /* lvebx */
1961 op->type = MKOP(LOAD_VMX, 0, 1);
1962 op->element_size = 1;
1963 break;
1964
1965 case 39: /* lvehx */
1966 op->type = MKOP(LOAD_VMX, 0, 2);
1967 op->element_size = 2;
1968 break;
1969
1970 case 71: /* lvewx */
1971 op->type = MKOP(LOAD_VMX, 0, 4);
1972 op->element_size = 4;
1973 break;
1974
1975 case 103: /* lvx */
1976 case 359: /* lvxl */
1977 op->type = MKOP(LOAD_VMX, 0, 16);
1978 op->element_size = 16;
1979 break;
1980
1981 case 135: /* stvebx */
1982 op->type = MKOP(STORE_VMX, 0, 1);
1983 op->element_size = 1;
1984 break;
1985
1986 case 167: /* stvehx */
1987 op->type = MKOP(STORE_VMX, 0, 2);
1988 op->element_size = 2;
1989 break;
1990
1991 case 199: /* stvewx */
1992 op->type = MKOP(STORE_VMX, 0, 4);
1993 op->element_size = 4;
1994 break;
1995
1996 case 231: /* stvx */
1997 case 487: /* stvxl */
1998 op->type = MKOP(STORE_VMX, 0, 16);
1999 break;
2000 #endif /* CONFIG_ALTIVEC */
2001
2002 #ifdef __powerpc64__
2003 case 21: /* ldx */
2004 case 53: /* ldux */
2005 op->type = MKOP(LOAD, u, 8);
2006 break;
2007
2008 case 149: /* stdx */
2009 case 181: /* stdux */
2010 op->type = MKOP(STORE, u, 8);
2011 break;
2012 #endif
2013
2014 case 151: /* stwx */
2015 case 183: /* stwux */
2016 op->type = MKOP(STORE, u, 4);
2017 break;
2018
2019 case 215: /* stbx */
2020 case 247: /* stbux */
2021 op->type = MKOP(STORE, u, 1);
2022 break;
2023
2024 case 279: /* lhzx */
2025 case 311: /* lhzux */
2026 op->type = MKOP(LOAD, u, 2);
2027 break;
2028
2029 #ifdef __powerpc64__
2030 case 341: /* lwax */
2031 case 373: /* lwaux */
2032 op->type = MKOP(LOAD, SIGNEXT | u, 4);
2033 break;
2034 #endif
2035
2036 case 343: /* lhax */
2037 case 375: /* lhaux */
2038 op->type = MKOP(LOAD, SIGNEXT | u, 2);
2039 break;
2040
2041 case 407: /* sthx */
2042 case 439: /* sthux */
2043 op->type = MKOP(STORE, u, 2);
2044 break;
2045
2046 #ifdef __powerpc64__
2047 case 532: /* ldbrx */
2048 op->type = MKOP(LOAD, BYTEREV, 8);
2049 break;
2050
2051 #endif
2052 case 533: /* lswx */
2053 op->type = MKOP(LOAD_MULTI, 0, regs->xer & 0x7f);
2054 break;
2055
2056 case 534: /* lwbrx */
2057 op->type = MKOP(LOAD, BYTEREV, 4);
2058 break;
2059
2060 case 597: /* lswi */
2061 if (rb == 0)
2062 rb = 32; /* # bytes to load */
2063 op->type = MKOP(LOAD_MULTI, 0, rb);
2064 op->ea = ra ? regs->gpr[ra] : 0;
2065 break;
2066
2067 #ifdef CONFIG_PPC_FPU
2068 case 535: /* lfsx */
2069 case 567: /* lfsux */
2070 op->type = MKOP(LOAD_FP, u | FPCONV, 4);
2071 break;
2072
2073 case 599: /* lfdx */
2074 case 631: /* lfdux */
2075 op->type = MKOP(LOAD_FP, u, 8);
2076 break;
2077
2078 case 663: /* stfsx */
2079 case 695: /* stfsux */
2080 op->type = MKOP(STORE_FP, u | FPCONV, 4);
2081 break;
2082
2083 case 727: /* stfdx */
2084 case 759: /* stfdux */
2085 op->type = MKOP(STORE_FP, u, 8);
2086 break;
2087
2088 #ifdef __powerpc64__
2089 case 791: /* lfdpx */
2090 op->type = MKOP(LOAD_FP, 0, 16);
2091 break;
2092
2093 case 855: /* lfiwax */
2094 op->type = MKOP(LOAD_FP, SIGNEXT, 4);
2095 break;
2096
2097 case 887: /* lfiwzx */
2098 op->type = MKOP(LOAD_FP, 0, 4);
2099 break;
2100
2101 case 919: /* stfdpx */
2102 op->type = MKOP(STORE_FP, 0, 16);
2103 break;
2104
2105 case 983: /* stfiwx */
2106 op->type = MKOP(STORE_FP, 0, 4);
2107 break;
2108 #endif /* __powerpc64 */
2109 #endif /* CONFIG_PPC_FPU */
2110
2111 #ifdef __powerpc64__
2112 case 660: /* stdbrx */
2113 op->type = MKOP(STORE, BYTEREV, 8);
2114 op->val = byterev_8(regs->gpr[rd]);
2115 break;
2116
2117 #endif
2118 case 661: /* stswx */
2119 op->type = MKOP(STORE_MULTI, 0, regs->xer & 0x7f);
2120 break;
2121
2122 case 662: /* stwbrx */
2123 op->type = MKOP(STORE, BYTEREV, 4);
2124 op->val = byterev_4(regs->gpr[rd]);
2125 break;
2126
2127 case 725: /* stswi */
2128 if (rb == 0)
2129 rb = 32; /* # bytes to store */
2130 op->type = MKOP(STORE_MULTI, 0, rb);
2131 op->ea = ra ? regs->gpr[ra] : 0;
2132 break;
2133
2134 case 790: /* lhbrx */
2135 op->type = MKOP(LOAD, BYTEREV, 2);
2136 break;
2137
2138 case 918: /* sthbrx */
2139 op->type = MKOP(STORE, BYTEREV, 2);
2140 op->val = byterev_2(regs->gpr[rd]);
2141 break;
2142
2143 #ifdef CONFIG_VSX
2144 case 12: /* lxsiwzx */
2145 op->reg = rd | ((instr & 1) << 5);
2146 op->type = MKOP(LOAD_VSX, 0, 4);
2147 op->element_size = 8;
2148 break;
2149
2150 case 76: /* lxsiwax */
2151 op->reg = rd | ((instr & 1) << 5);
2152 op->type = MKOP(LOAD_VSX, SIGNEXT, 4);
2153 op->element_size = 8;
2154 break;
2155
2156 case 140: /* stxsiwx */
2157 op->reg = rd | ((instr & 1) << 5);
2158 op->type = MKOP(STORE_VSX, 0, 4);
2159 op->element_size = 8;
2160 break;
2161
2162 case 268: /* lxvx */
2163 op->reg = rd | ((instr & 1) << 5);
2164 op->type = MKOP(LOAD_VSX, 0, 16);
2165 op->element_size = 16;
2166 op->vsx_flags = VSX_CHECK_VEC;
2167 break;
2168
2169 case 269: /* lxvl */
2170 case 301: { /* lxvll */
2171 int nb;
2172 op->reg = rd | ((instr & 1) << 5);
2173 op->ea = ra ? regs->gpr[ra] : 0;
2174 nb = regs->gpr[rb] & 0xff;
2175 if (nb > 16)
2176 nb = 16;
2177 op->type = MKOP(LOAD_VSX, 0, nb);
2178 op->element_size = 16;
2179 op->vsx_flags = ((instr & 0x20) ? VSX_LDLEFT : 0) |
2180 VSX_CHECK_VEC;
2181 break;
2182 }
2183 case 332: /* lxvdsx */
2184 op->reg = rd | ((instr & 1) << 5);
2185 op->type = MKOP(LOAD_VSX, 0, 8);
2186 op->element_size = 8;
2187 op->vsx_flags = VSX_SPLAT;
2188 break;
2189
2190 case 364: /* lxvwsx */
2191 op->reg = rd | ((instr & 1) << 5);
2192 op->type = MKOP(LOAD_VSX, 0, 4);
2193 op->element_size = 4;
2194 op->vsx_flags = VSX_SPLAT | VSX_CHECK_VEC;
2195 break;
2196
2197 case 396: /* stxvx */
2198 op->reg = rd | ((instr & 1) << 5);
2199 op->type = MKOP(STORE_VSX, 0, 16);
2200 op->element_size = 16;
2201 op->vsx_flags = VSX_CHECK_VEC;
2202 break;
2203
2204 case 397: /* stxvl */
2205 case 429: { /* stxvll */
2206 int nb;
2207 op->reg = rd | ((instr & 1) << 5);
2208 op->ea = ra ? regs->gpr[ra] : 0;
2209 nb = regs->gpr[rb] & 0xff;
2210 if (nb > 16)
2211 nb = 16;
2212 op->type = MKOP(STORE_VSX, 0, nb);
2213 op->element_size = 16;
2214 op->vsx_flags = ((instr & 0x20) ? VSX_LDLEFT : 0) |
2215 VSX_CHECK_VEC;
2216 break;
2217 }
2218 case 524: /* lxsspx */
2219 op->reg = rd | ((instr & 1) << 5);
2220 op->type = MKOP(LOAD_VSX, 0, 4);
2221 op->element_size = 8;
2222 op->vsx_flags = VSX_FPCONV;
2223 break;
2224
2225 case 588: /* lxsdx */
2226 op->reg = rd | ((instr & 1) << 5);
2227 op->type = MKOP(LOAD_VSX, 0, 8);
2228 op->element_size = 8;
2229 break;
2230
2231 case 652: /* stxsspx */
2232 op->reg = rd | ((instr & 1) << 5);
2233 op->type = MKOP(STORE_VSX, 0, 4);
2234 op->element_size = 8;
2235 op->vsx_flags = VSX_FPCONV;
2236 break;
2237
2238 case 716: /* stxsdx */
2239 op->reg = rd | ((instr & 1) << 5);
2240 op->type = MKOP(STORE_VSX, 0, 8);
2241 op->element_size = 8;
2242 break;
2243
2244 case 780: /* lxvw4x */
2245 op->reg = rd | ((instr & 1) << 5);
2246 op->type = MKOP(LOAD_VSX, 0, 16);
2247 op->element_size = 4;
2248 break;
2249
2250 case 781: /* lxsibzx */
2251 op->reg = rd | ((instr & 1) << 5);
2252 op->type = MKOP(LOAD_VSX, 0, 1);
2253 op->element_size = 8;
2254 op->vsx_flags = VSX_CHECK_VEC;
2255 break;
2256
2257 case 812: /* lxvh8x */
2258 op->reg = rd | ((instr & 1) << 5);
2259 op->type = MKOP(LOAD_VSX, 0, 16);
2260 op->element_size = 2;
2261 op->vsx_flags = VSX_CHECK_VEC;
2262 break;
2263
2264 case 813: /* lxsihzx */
2265 op->reg = rd | ((instr & 1) << 5);
2266 op->type = MKOP(LOAD_VSX, 0, 2);
2267 op->element_size = 8;
2268 op->vsx_flags = VSX_CHECK_VEC;
2269 break;
2270
2271 case 844: /* lxvd2x */
2272 op->reg = rd | ((instr & 1) << 5);
2273 op->type = MKOP(LOAD_VSX, 0, 16);
2274 op->element_size = 8;
2275 break;
2276
2277 case 876: /* lxvb16x */
2278 op->reg = rd | ((instr & 1) << 5);
2279 op->type = MKOP(LOAD_VSX, 0, 16);
2280 op->element_size = 1;
2281 op->vsx_flags = VSX_CHECK_VEC;
2282 break;
2283
2284 case 908: /* stxvw4x */
2285 op->reg = rd | ((instr & 1) << 5);
2286 op->type = MKOP(STORE_VSX, 0, 16);
2287 op->element_size = 4;
2288 break;
2289
2290 case 909: /* stxsibx */
2291 op->reg = rd | ((instr & 1) << 5);
2292 op->type = MKOP(STORE_VSX, 0, 1);
2293 op->element_size = 8;
2294 op->vsx_flags = VSX_CHECK_VEC;
2295 break;
2296
2297 case 940: /* stxvh8x */
2298 op->reg = rd | ((instr & 1) << 5);
2299 op->type = MKOP(STORE_VSX, 0, 16);
2300 op->element_size = 2;
2301 op->vsx_flags = VSX_CHECK_VEC;
2302 break;
2303
2304 case 941: /* stxsihx */
2305 op->reg = rd | ((instr & 1) << 5);
2306 op->type = MKOP(STORE_VSX, 0, 2);
2307 op->element_size = 8;
2308 op->vsx_flags = VSX_CHECK_VEC;
2309 break;
2310
2311 case 972: /* stxvd2x */
2312 op->reg = rd | ((instr & 1) << 5);
2313 op->type = MKOP(STORE_VSX, 0, 16);
2314 op->element_size = 8;
2315 break;
2316
2317 case 1004: /* stxvb16x */
2318 op->reg = rd | ((instr & 1) << 5);
2319 op->type = MKOP(STORE_VSX, 0, 16);
2320 op->element_size = 1;
2321 op->vsx_flags = VSX_CHECK_VEC;
2322 break;
2323
2324 #endif /* CONFIG_VSX */
2325 }
2326 break;
2327
2328 case 32: /* lwz */
2329 case 33: /* lwzu */
2330 op->type = MKOP(LOAD, u, 4);
2331 op->ea = dform_ea(instr, regs);
2332 break;
2333
2334 case 34: /* lbz */
2335 case 35: /* lbzu */
2336 op->type = MKOP(LOAD, u, 1);
2337 op->ea = dform_ea(instr, regs);
2338 break;
2339
2340 case 36: /* stw */
2341 case 37: /* stwu */
2342 op->type = MKOP(STORE, u, 4);
2343 op->ea = dform_ea(instr, regs);
2344 break;
2345
2346 case 38: /* stb */
2347 case 39: /* stbu */
2348 op->type = MKOP(STORE, u, 1);
2349 op->ea = dform_ea(instr, regs);
2350 break;
2351
2352 case 40: /* lhz */
2353 case 41: /* lhzu */
2354 op->type = MKOP(LOAD, u, 2);
2355 op->ea = dform_ea(instr, regs);
2356 break;
2357
2358 case 42: /* lha */
2359 case 43: /* lhau */
2360 op->type = MKOP(LOAD, SIGNEXT | u, 2);
2361 op->ea = dform_ea(instr, regs);
2362 break;
2363
2364 case 44: /* sth */
2365 case 45: /* sthu */
2366 op->type = MKOP(STORE, u, 2);
2367 op->ea = dform_ea(instr, regs);
2368 break;
2369
2370 case 46: /* lmw */
2371 if (ra >= rd)
2372 break; /* invalid form, ra in range to load */
2373 op->type = MKOP(LOAD_MULTI, 0, 4 * (32 - rd));
2374 op->ea = dform_ea(instr, regs);
2375 break;
2376
2377 case 47: /* stmw */
2378 op->type = MKOP(STORE_MULTI, 0, 4 * (32 - rd));
2379 op->ea = dform_ea(instr, regs);
2380 break;
2381
2382 #ifdef CONFIG_PPC_FPU
2383 case 48: /* lfs */
2384 case 49: /* lfsu */
2385 op->type = MKOP(LOAD_FP, u | FPCONV, 4);
2386 op->ea = dform_ea(instr, regs);
2387 break;
2388
2389 case 50: /* lfd */
2390 case 51: /* lfdu */
2391 op->type = MKOP(LOAD_FP, u, 8);
2392 op->ea = dform_ea(instr, regs);
2393 break;
2394
2395 case 52: /* stfs */
2396 case 53: /* stfsu */
2397 op->type = MKOP(STORE_FP, u | FPCONV, 4);
2398 op->ea = dform_ea(instr, regs);
2399 break;
2400
2401 case 54: /* stfd */
2402 case 55: /* stfdu */
2403 op->type = MKOP(STORE_FP, u, 8);
2404 op->ea = dform_ea(instr, regs);
2405 break;
2406 #endif
2407
2408 #ifdef __powerpc64__
2409 case 56: /* lq */
2410 if (!((rd & 1) || (rd == ra)))
2411 op->type = MKOP(LOAD, 0, 16);
2412 op->ea = dqform_ea(instr, regs);
2413 break;
2414 #endif
2415
2416 #ifdef CONFIG_VSX
2417 case 57: /* lfdp, lxsd, lxssp */
2418 op->ea = dsform_ea(instr, regs);
2419 switch (instr & 3) {
2420 case 0: /* lfdp */
2421 if (rd & 1)
2422 break; /* reg must be even */
2423 op->type = MKOP(LOAD_FP, 0, 16);
2424 break;
2425 case 2: /* lxsd */
2426 op->reg = rd + 32;
2427 op->type = MKOP(LOAD_VSX, 0, 8);
2428 op->element_size = 8;
2429 op->vsx_flags = VSX_CHECK_VEC;
2430 break;
2431 case 3: /* lxssp */
2432 op->reg = rd + 32;
2433 op->type = MKOP(LOAD_VSX, 0, 4);
2434 op->element_size = 8;
2435 op->vsx_flags = VSX_FPCONV | VSX_CHECK_VEC;
2436 break;
2437 }
2438 break;
2439 #endif /* CONFIG_VSX */
2440
2441 #ifdef __powerpc64__
2442 case 58: /* ld[u], lwa */
2443 op->ea = dsform_ea(instr, regs);
2444 switch (instr & 3) {
2445 case 0: /* ld */
2446 op->type = MKOP(LOAD, 0, 8);
2447 break;
2448 case 1: /* ldu */
2449 op->type = MKOP(LOAD, UPDATE, 8);
2450 break;
2451 case 2: /* lwa */
2452 op->type = MKOP(LOAD, SIGNEXT, 4);
2453 break;
2454 }
2455 break;
2456 #endif
2457
2458 #ifdef CONFIG_VSX
2459 case 61: /* stfdp, lxv, stxsd, stxssp, stxv */
2460 switch (instr & 7) {
2461 case 0: /* stfdp with LSB of DS field = 0 */
2462 case 4: /* stfdp with LSB of DS field = 1 */
2463 op->ea = dsform_ea(instr, regs);
2464 op->type = MKOP(STORE_FP, 0, 16);
2465 break;
2466
2467 case 1: /* lxv */
2468 op->ea = dqform_ea(instr, regs);
2469 if (instr & 8)
2470 op->reg = rd + 32;
2471 op->type = MKOP(LOAD_VSX, 0, 16);
2472 op->element_size = 16;
2473 op->vsx_flags = VSX_CHECK_VEC;
2474 break;
2475
2476 case 2: /* stxsd with LSB of DS field = 0 */
2477 case 6: /* stxsd with LSB of DS field = 1 */
2478 op->ea = dsform_ea(instr, regs);
2479 op->reg = rd + 32;
2480 op->type = MKOP(STORE_VSX, 0, 8);
2481 op->element_size = 8;
2482 op->vsx_flags = VSX_CHECK_VEC;
2483 break;
2484
2485 case 3: /* stxssp with LSB of DS field = 0 */
2486 case 7: /* stxssp with LSB of DS field = 1 */
2487 op->ea = dsform_ea(instr, regs);
2488 op->reg = rd + 32;
2489 op->type = MKOP(STORE_VSX, 0, 4);
2490 op->element_size = 8;
2491 op->vsx_flags = VSX_FPCONV | VSX_CHECK_VEC;
2492 break;
2493
2494 case 5: /* stxv */
2495 op->ea = dqform_ea(instr, regs);
2496 if (instr & 8)
2497 op->reg = rd + 32;
2498 op->type = MKOP(STORE_VSX, 0, 16);
2499 op->element_size = 16;
2500 op->vsx_flags = VSX_CHECK_VEC;
2501 break;
2502 }
2503 break;
2504 #endif /* CONFIG_VSX */
2505
2506 #ifdef __powerpc64__
2507 case 62: /* std[u] */
2508 op->ea = dsform_ea(instr, regs);
2509 switch (instr & 3) {
2510 case 0: /* std */
2511 op->type = MKOP(STORE, 0, 8);
2512 break;
2513 case 1: /* stdu */
2514 op->type = MKOP(STORE, UPDATE, 8);
2515 break;
2516 case 2: /* stq */
2517 if (!(rd & 1))
2518 op->type = MKOP(STORE, 0, 16);
2519 break;
2520 }
2521 break;
2522 #endif /* __powerpc64__ */
2523
2524 }
2525 return 0;
2526
2527 logical_done:
2528 if (instr & 1)
2529 set_cr0(regs, op, ra);
2530 logical_done_nocc:
2531 op->reg = ra;
2532 op->type |= SETREG;
2533 return 1;
2534
2535 arith_done:
2536 if (instr & 1)
2537 set_cr0(regs, op, rd);
2538 compute_done:
2539 op->reg = rd;
2540 op->type |= SETREG;
2541 return 1;
2542
2543 priv:
2544 op->type = INTERRUPT | 0x700;
2545 op->val = SRR1_PROGPRIV;
2546 return 0;
2547
2548 trap:
2549 op->type = INTERRUPT | 0x700;
2550 op->val = SRR1_PROGTRAP;
2551 return 0;
2552 }
2553 EXPORT_SYMBOL_GPL(analyse_instr);
2554 NOKPROBE_SYMBOL(analyse_instr);
2555
2556 /*
2557 * For PPC32 we always use stwu with r1 to change the stack pointer.
2558 * So this emulated store may corrupt the exception frame, now we
2559 * have to provide the exception frame trampoline, which is pushed
2560 * below the kprobed function stack. So we only update gpr[1] but
2561 * don't emulate the real store operation. We will do real store
2562 * operation safely in exception return code by checking this flag.
2563 */
2564 static nokprobe_inline int handle_stack_update(unsigned long ea, struct pt_regs *regs)
2565 {
2566 #ifdef CONFIG_PPC32
2567 /*
2568 * Check if we will touch kernel stack overflow
2569 */
2570 if (ea - STACK_INT_FRAME_SIZE <= current->thread.ksp_limit) {
2571 printk(KERN_CRIT "Can't kprobe this since kernel stack would overflow.\n");
2572 return -EINVAL;
2573 }
2574 #endif /* CONFIG_PPC32 */
2575 /*
2576 * Check if we already set since that means we'll
2577 * lose the previous value.
2578 */
2579 WARN_ON(test_thread_flag(TIF_EMULATE_STACK_STORE));
2580 set_thread_flag(TIF_EMULATE_STACK_STORE);
2581 return 0;
2582 }
2583
2584 static nokprobe_inline void do_signext(unsigned long *valp, int size)
2585 {
2586 switch (size) {
2587 case 2:
2588 *valp = (signed short) *valp;
2589 break;
2590 case 4:
2591 *valp = (signed int) *valp;
2592 break;
2593 }
2594 }
2595
2596 static nokprobe_inline void do_byterev(unsigned long *valp, int size)
2597 {
2598 switch (size) {
2599 case 2:
2600 *valp = byterev_2(*valp);
2601 break;
2602 case 4:
2603 *valp = byterev_4(*valp);
2604 break;
2605 #ifdef __powerpc64__
2606 case 8:
2607 *valp = byterev_8(*valp);
2608 break;
2609 #endif
2610 }
2611 }
2612
2613 /*
2614 * Emulate an instruction that can be executed just by updating
2615 * fields in *regs.
2616 */
2617 void emulate_update_regs(struct pt_regs *regs, struct instruction_op *op)
2618 {
2619 unsigned long next_pc;
2620
2621 next_pc = truncate_if_32bit(regs->msr, regs->nip + 4);
2622 switch (op->type & INSTR_TYPE_MASK) {
2623 case COMPUTE:
2624 if (op->type & SETREG)
2625 regs->gpr[op->reg] = op->val;
2626 if (op->type & SETCC)
2627 regs->ccr = op->ccval;
2628 if (op->type & SETXER)
2629 regs->xer = op->xerval;
2630 break;
2631
2632 case BRANCH:
2633 if (op->type & SETLK)
2634 regs->link = next_pc;
2635 if (op->type & BRTAKEN)
2636 next_pc = op->val;
2637 if (op->type & DECCTR)
2638 --regs->ctr;
2639 break;
2640
2641 case BARRIER:
2642 switch (op->type & BARRIER_MASK) {
2643 case BARRIER_SYNC:
2644 mb();
2645 break;
2646 case BARRIER_ISYNC:
2647 isync();
2648 break;
2649 case BARRIER_EIEIO:
2650 eieio();
2651 break;
2652 case BARRIER_LWSYNC:
2653 asm volatile("lwsync" : : : "memory");
2654 break;
2655 case BARRIER_PTESYNC:
2656 asm volatile("ptesync" : : : "memory");
2657 break;
2658 }
2659 break;
2660
2661 case MFSPR:
2662 switch (op->spr) {
2663 case SPRN_XER:
2664 regs->gpr[op->reg] = regs->xer & 0xffffffffUL;
2665 break;
2666 case SPRN_LR:
2667 regs->gpr[op->reg] = regs->link;
2668 break;
2669 case SPRN_CTR:
2670 regs->gpr[op->reg] = regs->ctr;
2671 break;
2672 default:
2673 WARN_ON_ONCE(1);
2674 }
2675 break;
2676
2677 case MTSPR:
2678 switch (op->spr) {
2679 case SPRN_XER:
2680 regs->xer = op->val & 0xffffffffUL;
2681 break;
2682 case SPRN_LR:
2683 regs->link = op->val;
2684 break;
2685 case SPRN_CTR:
2686 regs->ctr = op->val;
2687 break;
2688 default:
2689 WARN_ON_ONCE(1);
2690 }
2691 break;
2692
2693 default:
2694 WARN_ON_ONCE(1);
2695 }
2696 regs->nip = next_pc;
2697 }
2698
2699 /*
2700 * Emulate a previously-analysed load or store instruction.
2701 * Return values are:
2702 * 0 = instruction emulated successfully
2703 * -EFAULT = address out of range or access faulted (regs->dar
2704 * contains the faulting address)
2705 * -EACCES = misaligned access, instruction requires alignment
2706 * -EINVAL = unknown operation in *op
2707 */
2708 int emulate_loadstore(struct pt_regs *regs, struct instruction_op *op)
2709 {
2710 int err, size, type;
2711 int i, rd, nb;
2712 unsigned int cr;
2713 unsigned long val;
2714 unsigned long ea;
2715 bool cross_endian;
2716
2717 err = 0;
2718 size = GETSIZE(op->type);
2719 type = op->type & INSTR_TYPE_MASK;
2720 cross_endian = (regs->msr & MSR_LE) != (MSR_KERNEL & MSR_LE);
2721 ea = truncate_if_32bit(regs->msr, op->ea);
2722
2723 switch (type) {
2724 case LARX:
2725 if (ea & (size - 1))
2726 return -EACCES; /* can't handle misaligned */
2727 if (!address_ok(regs, ea, size))
2728 return -EFAULT;
2729 err = 0;
2730 val = 0;
2731 switch (size) {
2732 #ifdef __powerpc64__
2733 case 1:
2734 __get_user_asmx(val, ea, err, "lbarx");
2735 break;
2736 case 2:
2737 __get_user_asmx(val, ea, err, "lharx");
2738 break;
2739 #endif
2740 case 4:
2741 __get_user_asmx(val, ea, err, "lwarx");
2742 break;
2743 #ifdef __powerpc64__
2744 case 8:
2745 __get_user_asmx(val, ea, err, "ldarx");
2746 break;
2747 case 16:
2748 err = do_lqarx(ea, &regs->gpr[op->reg]);
2749 break;
2750 #endif
2751 default:
2752 return -EINVAL;
2753 }
2754 if (err) {
2755 regs->dar = ea;
2756 break;
2757 }
2758 if (size < 16)
2759 regs->gpr[op->reg] = val;
2760 break;
2761
2762 case STCX:
2763 if (ea & (size - 1))
2764 return -EACCES; /* can't handle misaligned */
2765 if (!address_ok(regs, ea, size))
2766 return -EFAULT;
2767 err = 0;
2768 switch (size) {
2769 #ifdef __powerpc64__
2770 case 1:
2771 __put_user_asmx(op->val, ea, err, "stbcx.", cr);
2772 break;
2773 case 2:
2774 __put_user_asmx(op->val, ea, err, "stbcx.", cr);
2775 break;
2776 #endif
2777 case 4:
2778 __put_user_asmx(op->val, ea, err, "stwcx.", cr);
2779 break;
2780 #ifdef __powerpc64__
2781 case 8:
2782 __put_user_asmx(op->val, ea, err, "stdcx.", cr);
2783 break;
2784 case 16:
2785 err = do_stqcx(ea, regs->gpr[op->reg],
2786 regs->gpr[op->reg + 1], &cr);
2787 break;
2788 #endif
2789 default:
2790 return -EINVAL;
2791 }
2792 if (!err)
2793 regs->ccr = (regs->ccr & 0x0fffffff) |
2794 (cr & 0xe0000000) |
2795 ((regs->xer >> 3) & 0x10000000);
2796 else
2797 regs->dar = ea;
2798 break;
2799
2800 case LOAD:
2801 #ifdef __powerpc64__
2802 if (size == 16) {
2803 err = emulate_lq(regs, ea, op->reg, cross_endian);
2804 break;
2805 }
2806 #endif
2807 err = read_mem(&regs->gpr[op->reg], ea, size, regs);
2808 if (!err) {
2809 if (op->type & SIGNEXT)
2810 do_signext(&regs->gpr[op->reg], size);
2811 if ((op->type & BYTEREV) == (cross_endian ? 0 : BYTEREV))
2812 do_byterev(&regs->gpr[op->reg], size);
2813 }
2814 break;
2815
2816 #ifdef CONFIG_PPC_FPU
2817 case LOAD_FP:
2818 /*
2819 * If the instruction is in userspace, we can emulate it even
2820 * if the VMX state is not live, because we have the state
2821 * stored in the thread_struct. If the instruction is in
2822 * the kernel, we must not touch the state in the thread_struct.
2823 */
2824 if (!(regs->msr & MSR_PR) && !(regs->msr & MSR_FP))
2825 return 0;
2826 err = do_fp_load(op, ea, regs, cross_endian);
2827 break;
2828 #endif
2829 #ifdef CONFIG_ALTIVEC
2830 case LOAD_VMX:
2831 if (!(regs->msr & MSR_PR) && !(regs->msr & MSR_VEC))
2832 return 0;
2833 err = do_vec_load(op->reg, ea, size, regs, cross_endian);
2834 break;
2835 #endif
2836 #ifdef CONFIG_VSX
2837 case LOAD_VSX: {
2838 unsigned long msrbit = MSR_VSX;
2839
2840 /*
2841 * Some VSX instructions check the MSR_VEC bit rather than MSR_VSX
2842 * when the target of the instruction is a vector register.
2843 */
2844 if (op->reg >= 32 && (op->vsx_flags & VSX_CHECK_VEC))
2845 msrbit = MSR_VEC;
2846 if (!(regs->msr & MSR_PR) && !(regs->msr & msrbit))
2847 return 0;
2848 err = do_vsx_load(op, ea, regs, cross_endian);
2849 break;
2850 }
2851 #endif
2852 case LOAD_MULTI:
2853 if (!address_ok(regs, ea, size))
2854 return -EFAULT;
2855 rd = op->reg;
2856 for (i = 0; i < size; i += 4) {
2857 unsigned int v32 = 0;
2858
2859 nb = size - i;
2860 if (nb > 4)
2861 nb = 4;
2862 err = copy_mem_in((u8 *) &v32, ea, nb, regs);
2863 if (err)
2864 break;
2865 if (unlikely(cross_endian))
2866 v32 = byterev_4(v32);
2867 regs->gpr[rd] = v32;
2868 ea += 4;
2869 /* reg number wraps from 31 to 0 for lsw[ix] */
2870 rd = (rd + 1) & 0x1f;
2871 }
2872 break;
2873
2874 case STORE:
2875 #ifdef __powerpc64__
2876 if (size == 16) {
2877 err = emulate_stq(regs, ea, op->reg, cross_endian);
2878 break;
2879 }
2880 #endif
2881 if ((op->type & UPDATE) && size == sizeof(long) &&
2882 op->reg == 1 && op->update_reg == 1 &&
2883 !(regs->msr & MSR_PR) &&
2884 ea >= regs->gpr[1] - STACK_INT_FRAME_SIZE) {
2885 err = handle_stack_update(ea, regs);
2886 break;
2887 }
2888 if (unlikely(cross_endian))
2889 do_byterev(&op->val, size);
2890 err = write_mem(op->val, ea, size, regs);
2891 break;
2892
2893 #ifdef CONFIG_PPC_FPU
2894 case STORE_FP:
2895 if (!(regs->msr & MSR_PR) && !(regs->msr & MSR_FP))
2896 return 0;
2897 err = do_fp_store(op, ea, regs, cross_endian);
2898 break;
2899 #endif
2900 #ifdef CONFIG_ALTIVEC
2901 case STORE_VMX:
2902 if (!(regs->msr & MSR_PR) && !(regs->msr & MSR_VEC))
2903 return 0;
2904 err = do_vec_store(op->reg, ea, size, regs, cross_endian);
2905 break;
2906 #endif
2907 #ifdef CONFIG_VSX
2908 case STORE_VSX: {
2909 unsigned long msrbit = MSR_VSX;
2910
2911 /*
2912 * Some VSX instructions check the MSR_VEC bit rather than MSR_VSX
2913 * when the target of the instruction is a vector register.
2914 */
2915 if (op->reg >= 32 && (op->vsx_flags & VSX_CHECK_VEC))
2916 msrbit = MSR_VEC;
2917 if (!(regs->msr & MSR_PR) && !(regs->msr & msrbit))
2918 return 0;
2919 err = do_vsx_store(op, ea, regs, cross_endian);
2920 break;
2921 }
2922 #endif
2923 case STORE_MULTI:
2924 if (!address_ok(regs, ea, size))
2925 return -EFAULT;
2926 rd = op->reg;
2927 for (i = 0; i < size; i += 4) {
2928 unsigned int v32 = regs->gpr[rd];
2929
2930 nb = size - i;
2931 if (nb > 4)
2932 nb = 4;
2933 if (unlikely(cross_endian))
2934 v32 = byterev_4(v32);
2935 err = copy_mem_out((u8 *) &v32, ea, nb, regs);
2936 if (err)
2937 break;
2938 ea += 4;
2939 /* reg number wraps from 31 to 0 for stsw[ix] */
2940 rd = (rd + 1) & 0x1f;
2941 }
2942 break;
2943
2944 default:
2945 return -EINVAL;
2946 }
2947
2948 if (err)
2949 return err;
2950
2951 if (op->type & UPDATE)
2952 regs->gpr[op->update_reg] = op->ea;
2953
2954 return 0;
2955 }
2956 NOKPROBE_SYMBOL(emulate_loadstore);
2957
2958 /*
2959 * Emulate instructions that cause a transfer of control,
2960 * loads and stores, and a few other instructions.
2961 * Returns 1 if the step was emulated, 0 if not,
2962 * or -1 if the instruction is one that should not be stepped,
2963 * such as an rfid, or a mtmsrd that would clear MSR_RI.
2964 */
2965 int emulate_step(struct pt_regs *regs, unsigned int instr)
2966 {
2967 struct instruction_op op;
2968 int r, err, type;
2969 unsigned long val;
2970 unsigned long ea;
2971
2972 r = analyse_instr(&op, regs, instr);
2973 if (r < 0)
2974 return r;
2975 if (r > 0) {
2976 emulate_update_regs(regs, &op);
2977 return 1;
2978 }
2979
2980 err = 0;
2981 type = op.type & INSTR_TYPE_MASK;
2982
2983 if (OP_IS_LOAD_STORE(type)) {
2984 err = emulate_loadstore(regs, &op);
2985 if (err)
2986 return 0;
2987 goto instr_done;
2988 }
2989
2990 switch (type) {
2991 case CACHEOP:
2992 ea = truncate_if_32bit(regs->msr, op.ea);
2993 if (!address_ok(regs, ea, 8))
2994 return 0;
2995 switch (op.type & CACHEOP_MASK) {
2996 case DCBST:
2997 __cacheop_user_asmx(ea, err, "dcbst");
2998 break;
2999 case DCBF:
3000 __cacheop_user_asmx(ea, err, "dcbf");
3001 break;
3002 case DCBTST:
3003 if (op.reg == 0)
3004 prefetchw((void *) ea);
3005 break;
3006 case DCBT:
3007 if (op.reg == 0)
3008 prefetch((void *) ea);
3009 break;
3010 case ICBI:
3011 __cacheop_user_asmx(ea, err, "icbi");
3012 break;
3013 case DCBZ:
3014 err = emulate_dcbz(ea, regs);
3015 break;
3016 }
3017 if (err) {
3018 regs->dar = ea;
3019 return 0;
3020 }
3021 goto instr_done;
3022
3023 case MFMSR:
3024 regs->gpr[op.reg] = regs->msr & MSR_MASK;
3025 goto instr_done;
3026
3027 case MTMSR:
3028 val = regs->gpr[op.reg];
3029 if ((val & MSR_RI) == 0)
3030 /* can't step mtmsr[d] that would clear MSR_RI */
3031 return -1;
3032 /* here op.val is the mask of bits to change */
3033 regs->msr = (regs->msr & ~op.val) | (val & op.val);
3034 goto instr_done;
3035
3036 #ifdef CONFIG_PPC64
3037 case SYSCALL: /* sc */
3038 /*
3039 * N.B. this uses knowledge about how the syscall
3040 * entry code works. If that is changed, this will
3041 * need to be changed also.
3042 */
3043 if (regs->gpr[0] == 0x1ebe &&
3044 cpu_has_feature(CPU_FTR_REAL_LE)) {
3045 regs->msr ^= MSR_LE;
3046 goto instr_done;
3047 }
3048 regs->gpr[9] = regs->gpr[13];
3049 regs->gpr[10] = MSR_KERNEL;
3050 regs->gpr[11] = regs->nip + 4;
3051 regs->gpr[12] = regs->msr & MSR_MASK;
3052 regs->gpr[13] = (unsigned long) get_paca();
3053 regs->nip = (unsigned long) &system_call_common;
3054 regs->msr = MSR_KERNEL;
3055 return 1;
3056
3057 case RFI:
3058 return -1;
3059 #endif
3060 }
3061 return 0;
3062
3063 instr_done:
3064 regs->nip = truncate_if_32bit(regs->msr, regs->nip + 4);
3065 return 1;
3066 }
3067 NOKPROBE_SYMBOL(emulate_step);
ubuntu-bionic-kernel mirror