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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 <asm/uaccess.h>
18 #include <asm/cputable.h>
19
20 extern char system_call_common[];
21
22 #ifdef CONFIG_PPC64
23 /* Bits in SRR1 that are copied from MSR */
24 #define MSR_MASK 0xffffffff87c0ffffUL
25 #else
26 #define MSR_MASK 0x87c0ffff
27 #endif
28
29 /* Bits in XER */
30 #define XER_SO 0x80000000U
31 #define XER_OV 0x40000000U
32 #define XER_CA 0x20000000U
33
34 #ifdef CONFIG_PPC_FPU
35 /*
36 * Functions in ldstfp.S
37 */
38 extern int do_lfs(int rn, unsigned long ea);
39 extern int do_lfd(int rn, unsigned long ea);
40 extern int do_stfs(int rn, unsigned long ea);
41 extern int do_stfd(int rn, unsigned long ea);
42 extern int do_lvx(int rn, unsigned long ea);
43 extern int do_stvx(int rn, unsigned long ea);
44 extern int do_lxvd2x(int rn, unsigned long ea);
45 extern int do_stxvd2x(int rn, unsigned long ea);
46 #endif
47
48 /*
49 * Emulate the truncation of 64 bit values in 32-bit mode.
50 */
51 static unsigned long truncate_if_32bit(unsigned long msr, unsigned long val)
52 {
53 #ifdef __powerpc64__
54 if ((msr & MSR_64BIT) == 0)
55 val &= 0xffffffffUL;
56 #endif
57 return val;
58 }
59
60 /*
61 * Determine whether a conditional branch instruction would branch.
62 */
63 static int __kprobes branch_taken(unsigned int instr, struct pt_regs *regs)
64 {
65 unsigned int bo = (instr >> 21) & 0x1f;
66 unsigned int bi;
67
68 if ((bo & 4) == 0) {
69 /* decrement counter */
70 --regs->ctr;
71 if (((bo >> 1) & 1) ^ (regs->ctr == 0))
72 return 0;
73 }
74 if ((bo & 0x10) == 0) {
75 /* check bit from CR */
76 bi = (instr >> 16) & 0x1f;
77 if (((regs->ccr >> (31 - bi)) & 1) != ((bo >> 3) & 1))
78 return 0;
79 }
80 return 1;
81 }
82
83
84 static long __kprobes address_ok(struct pt_regs *regs, unsigned long ea, int nb)
85 {
86 if (!user_mode(regs))
87 return 1;
88 return __access_ok(ea, nb, USER_DS);
89 }
90
91 /*
92 * Calculate effective address for a D-form instruction
93 */
94 static unsigned long __kprobes dform_ea(unsigned int instr, struct pt_regs *regs)
95 {
96 int ra;
97 unsigned long ea;
98
99 ra = (instr >> 16) & 0x1f;
100 ea = (signed short) instr; /* sign-extend */
101 if (ra) {
102 ea += regs->gpr[ra];
103 if (instr & 0x04000000) { /* update forms */
104 if ((instr>>26) != 47) /* stmw is not an update form */
105 regs->gpr[ra] = ea;
106 }
107 }
108
109 return truncate_if_32bit(regs->msr, ea);
110 }
111
112 #ifdef __powerpc64__
113 /*
114 * Calculate effective address for a DS-form instruction
115 */
116 static unsigned long __kprobes dsform_ea(unsigned int instr, struct pt_regs *regs)
117 {
118 int ra;
119 unsigned long ea;
120
121 ra = (instr >> 16) & 0x1f;
122 ea = (signed short) (instr & ~3); /* sign-extend */
123 if (ra) {
124 ea += regs->gpr[ra];
125 if ((instr & 3) == 1) /* update forms */
126 regs->gpr[ra] = ea;
127 }
128
129 return truncate_if_32bit(regs->msr, ea);
130 }
131 #endif /* __powerpc64 */
132
133 /*
134 * Calculate effective address for an X-form instruction
135 */
136 static unsigned long __kprobes xform_ea(unsigned int instr, struct pt_regs *regs,
137 int do_update)
138 {
139 int ra, rb;
140 unsigned long ea;
141
142 ra = (instr >> 16) & 0x1f;
143 rb = (instr >> 11) & 0x1f;
144 ea = regs->gpr[rb];
145 if (ra) {
146 ea += regs->gpr[ra];
147 if (do_update) /* update forms */
148 regs->gpr[ra] = ea;
149 }
150
151 return truncate_if_32bit(regs->msr, ea);
152 }
153
154 /*
155 * Return the largest power of 2, not greater than sizeof(unsigned long),
156 * such that x is a multiple of it.
157 */
158 static inline unsigned long max_align(unsigned long x)
159 {
160 x |= sizeof(unsigned long);
161 return x & -x; /* isolates rightmost bit */
162 }
163
164
165 static inline unsigned long byterev_2(unsigned long x)
166 {
167 return ((x >> 8) & 0xff) | ((x & 0xff) << 8);
168 }
169
170 static inline unsigned long byterev_4(unsigned long x)
171 {
172 return ((x >> 24) & 0xff) | ((x >> 8) & 0xff00) |
173 ((x & 0xff00) << 8) | ((x & 0xff) << 24);
174 }
175
176 #ifdef __powerpc64__
177 static inline unsigned long byterev_8(unsigned long x)
178 {
179 return (byterev_4(x) << 32) | byterev_4(x >> 32);
180 }
181 #endif
182
183 static int __kprobes read_mem_aligned(unsigned long *dest, unsigned long ea,
184 int nb)
185 {
186 int err = 0;
187 unsigned long x = 0;
188
189 switch (nb) {
190 case 1:
191 err = __get_user(x, (unsigned char __user *) ea);
192 break;
193 case 2:
194 err = __get_user(x, (unsigned short __user *) ea);
195 break;
196 case 4:
197 err = __get_user(x, (unsigned int __user *) ea);
198 break;
199 #ifdef __powerpc64__
200 case 8:
201 err = __get_user(x, (unsigned long __user *) ea);
202 break;
203 #endif
204 }
205 if (!err)
206 *dest = x;
207 return err;
208 }
209
210 static int __kprobes read_mem_unaligned(unsigned long *dest, unsigned long ea,
211 int nb, struct pt_regs *regs)
212 {
213 int err;
214 unsigned long x, b, c;
215 #ifdef __LITTLE_ENDIAN__
216 int len = nb; /* save a copy of the length for byte reversal */
217 #endif
218
219 /* unaligned, do this in pieces */
220 x = 0;
221 for (; nb > 0; nb -= c) {
222 #ifdef __LITTLE_ENDIAN__
223 c = 1;
224 #endif
225 #ifdef __BIG_ENDIAN__
226 c = max_align(ea);
227 #endif
228 if (c > nb)
229 c = max_align(nb);
230 err = read_mem_aligned(&b, ea, c);
231 if (err)
232 return err;
233 x = (x << (8 * c)) + b;
234 ea += c;
235 }
236 #ifdef __LITTLE_ENDIAN__
237 switch (len) {
238 case 2:
239 *dest = byterev_2(x);
240 break;
241 case 4:
242 *dest = byterev_4(x);
243 break;
244 #ifdef __powerpc64__
245 case 8:
246 *dest = byterev_8(x);
247 break;
248 #endif
249 }
250 #endif
251 #ifdef __BIG_ENDIAN__
252 *dest = x;
253 #endif
254 return 0;
255 }
256
257 /*
258 * Read memory at address ea for nb bytes, return 0 for success
259 * or -EFAULT if an error occurred.
260 */
261 static int __kprobes read_mem(unsigned long *dest, unsigned long ea, int nb,
262 struct pt_regs *regs)
263 {
264 if (!address_ok(regs, ea, nb))
265 return -EFAULT;
266 if ((ea & (nb - 1)) == 0)
267 return read_mem_aligned(dest, ea, nb);
268 return read_mem_unaligned(dest, ea, nb, regs);
269 }
270
271 static int __kprobes write_mem_aligned(unsigned long val, unsigned long ea,
272 int nb)
273 {
274 int err = 0;
275
276 switch (nb) {
277 case 1:
278 err = __put_user(val, (unsigned char __user *) ea);
279 break;
280 case 2:
281 err = __put_user(val, (unsigned short __user *) ea);
282 break;
283 case 4:
284 err = __put_user(val, (unsigned int __user *) ea);
285 break;
286 #ifdef __powerpc64__
287 case 8:
288 err = __put_user(val, (unsigned long __user *) ea);
289 break;
290 #endif
291 }
292 return err;
293 }
294
295 static int __kprobes write_mem_unaligned(unsigned long val, unsigned long ea,
296 int nb, struct pt_regs *regs)
297 {
298 int err;
299 unsigned long c;
300
301 #ifdef __LITTLE_ENDIAN__
302 switch (nb) {
303 case 2:
304 val = byterev_2(val);
305 break;
306 case 4:
307 val = byterev_4(val);
308 break;
309 #ifdef __powerpc64__
310 case 8:
311 val = byterev_8(val);
312 break;
313 #endif
314 }
315 #endif
316 /* unaligned or little-endian, do this in pieces */
317 for (; nb > 0; nb -= c) {
318 #ifdef __LITTLE_ENDIAN__
319 c = 1;
320 #endif
321 #ifdef __BIG_ENDIAN__
322 c = max_align(ea);
323 #endif
324 if (c > nb)
325 c = max_align(nb);
326 err = write_mem_aligned(val >> (nb - c) * 8, ea, c);
327 if (err)
328 return err;
329 ea += c;
330 }
331 return 0;
332 }
333
334 /*
335 * Write memory at address ea for nb bytes, return 0 for success
336 * or -EFAULT if an error occurred.
337 */
338 static int __kprobes write_mem(unsigned long val, unsigned long ea, int nb,
339 struct pt_regs *regs)
340 {
341 if (!address_ok(regs, ea, nb))
342 return -EFAULT;
343 if ((ea & (nb - 1)) == 0)
344 return write_mem_aligned(val, ea, nb);
345 return write_mem_unaligned(val, ea, nb, regs);
346 }
347
348 #ifdef CONFIG_PPC_FPU
349 /*
350 * Check the address and alignment, and call func to do the actual
351 * load or store.
352 */
353 static int __kprobes do_fp_load(int rn, int (*func)(int, unsigned long),
354 unsigned long ea, int nb,
355 struct pt_regs *regs)
356 {
357 int err;
358 union {
359 double dbl;
360 unsigned long ul[2];
361 struct {
362 #ifdef __BIG_ENDIAN__
363 unsigned _pad_;
364 unsigned word;
365 #endif
366 #ifdef __LITTLE_ENDIAN__
367 unsigned word;
368 unsigned _pad_;
369 #endif
370 } single;
371 } data;
372 unsigned long ptr;
373
374 if (!address_ok(regs, ea, nb))
375 return -EFAULT;
376 if ((ea & 3) == 0)
377 return (*func)(rn, ea);
378 ptr = (unsigned long) &data.ul;
379 if (sizeof(unsigned long) == 8 || nb == 4) {
380 err = read_mem_unaligned(&data.ul[0], ea, nb, regs);
381 if (nb == 4)
382 ptr = (unsigned long)&(data.single.word);
383 } else {
384 /* reading a double on 32-bit */
385 err = read_mem_unaligned(&data.ul[0], ea, 4, regs);
386 if (!err)
387 err = read_mem_unaligned(&data.ul[1], ea + 4, 4, regs);
388 }
389 if (err)
390 return err;
391 return (*func)(rn, ptr);
392 }
393
394 static int __kprobes do_fp_store(int rn, int (*func)(int, unsigned long),
395 unsigned long ea, int nb,
396 struct pt_regs *regs)
397 {
398 int err;
399 union {
400 double dbl;
401 unsigned long ul[2];
402 struct {
403 #ifdef __BIG_ENDIAN__
404 unsigned _pad_;
405 unsigned word;
406 #endif
407 #ifdef __LITTLE_ENDIAN__
408 unsigned word;
409 unsigned _pad_;
410 #endif
411 } single;
412 } data;
413 unsigned long ptr;
414
415 if (!address_ok(regs, ea, nb))
416 return -EFAULT;
417 if ((ea & 3) == 0)
418 return (*func)(rn, ea);
419 ptr = (unsigned long) &data.ul[0];
420 if (sizeof(unsigned long) == 8 || nb == 4) {
421 if (nb == 4)
422 ptr = (unsigned long)&(data.single.word);
423 err = (*func)(rn, ptr);
424 if (err)
425 return err;
426 err = write_mem_unaligned(data.ul[0], ea, nb, regs);
427 } else {
428 /* writing a double on 32-bit */
429 err = (*func)(rn, ptr);
430 if (err)
431 return err;
432 err = write_mem_unaligned(data.ul[0], ea, 4, regs);
433 if (!err)
434 err = write_mem_unaligned(data.ul[1], ea + 4, 4, regs);
435 }
436 return err;
437 }
438 #endif
439
440 #ifdef CONFIG_ALTIVEC
441 /* For Altivec/VMX, no need to worry about alignment */
442 static int __kprobes do_vec_load(int rn, int (*func)(int, unsigned long),
443 unsigned long ea, struct pt_regs *regs)
444 {
445 if (!address_ok(regs, ea & ~0xfUL, 16))
446 return -EFAULT;
447 return (*func)(rn, ea);
448 }
449
450 static int __kprobes do_vec_store(int rn, int (*func)(int, unsigned long),
451 unsigned long ea, struct pt_regs *regs)
452 {
453 if (!address_ok(regs, ea & ~0xfUL, 16))
454 return -EFAULT;
455 return (*func)(rn, ea);
456 }
457 #endif /* CONFIG_ALTIVEC */
458
459 #ifdef CONFIG_VSX
460 static int __kprobes do_vsx_load(int rn, int (*func)(int, unsigned long),
461 unsigned long ea, struct pt_regs *regs)
462 {
463 int err;
464 unsigned long val[2];
465
466 if (!address_ok(regs, ea, 16))
467 return -EFAULT;
468 if ((ea & 3) == 0)
469 return (*func)(rn, ea);
470 err = read_mem_unaligned(&val[0], ea, 8, regs);
471 if (!err)
472 err = read_mem_unaligned(&val[1], ea + 8, 8, regs);
473 if (!err)
474 err = (*func)(rn, (unsigned long) &val[0]);
475 return err;
476 }
477
478 static int __kprobes do_vsx_store(int rn, int (*func)(int, unsigned long),
479 unsigned long ea, struct pt_regs *regs)
480 {
481 int err;
482 unsigned long val[2];
483
484 if (!address_ok(regs, ea, 16))
485 return -EFAULT;
486 if ((ea & 3) == 0)
487 return (*func)(rn, ea);
488 err = (*func)(rn, (unsigned long) &val[0]);
489 if (err)
490 return err;
491 err = write_mem_unaligned(val[0], ea, 8, regs);
492 if (!err)
493 err = write_mem_unaligned(val[1], ea + 8, 8, regs);
494 return err;
495 }
496 #endif /* CONFIG_VSX */
497
498 #define __put_user_asmx(x, addr, err, op, cr) \
499 __asm__ __volatile__( \
500 "1: " op " %2,0,%3\n" \
501 " mfcr %1\n" \
502 "2:\n" \
503 ".section .fixup,\"ax\"\n" \
504 "3: li %0,%4\n" \
505 " b 2b\n" \
506 ".previous\n" \
507 ".section __ex_table,\"a\"\n" \
508 PPC_LONG_ALIGN "\n" \
509 PPC_LONG "1b,3b\n" \
510 ".previous" \
511 : "=r" (err), "=r" (cr) \
512 : "r" (x), "r" (addr), "i" (-EFAULT), "0" (err))
513
514 #define __get_user_asmx(x, addr, err, op) \
515 __asm__ __volatile__( \
516 "1: "op" %1,0,%2\n" \
517 "2:\n" \
518 ".section .fixup,\"ax\"\n" \
519 "3: li %0,%3\n" \
520 " b 2b\n" \
521 ".previous\n" \
522 ".section __ex_table,\"a\"\n" \
523 PPC_LONG_ALIGN "\n" \
524 PPC_LONG "1b,3b\n" \
525 ".previous" \
526 : "=r" (err), "=r" (x) \
527 : "r" (addr), "i" (-EFAULT), "0" (err))
528
529 #define __cacheop_user_asmx(addr, err, op) \
530 __asm__ __volatile__( \
531 "1: "op" 0,%1\n" \
532 "2:\n" \
533 ".section .fixup,\"ax\"\n" \
534 "3: li %0,%3\n" \
535 " b 2b\n" \
536 ".previous\n" \
537 ".section __ex_table,\"a\"\n" \
538 PPC_LONG_ALIGN "\n" \
539 PPC_LONG "1b,3b\n" \
540 ".previous" \
541 : "=r" (err) \
542 : "r" (addr), "i" (-EFAULT), "0" (err))
543
544 static void __kprobes set_cr0(struct pt_regs *regs, int rd)
545 {
546 long val = regs->gpr[rd];
547
548 regs->ccr = (regs->ccr & 0x0fffffff) | ((regs->xer >> 3) & 0x10000000);
549 #ifdef __powerpc64__
550 if (!(regs->msr & MSR_64BIT))
551 val = (int) val;
552 #endif
553 if (val < 0)
554 regs->ccr |= 0x80000000;
555 else if (val > 0)
556 regs->ccr |= 0x40000000;
557 else
558 regs->ccr |= 0x20000000;
559 }
560
561 static void __kprobes add_with_carry(struct pt_regs *regs, int rd,
562 unsigned long val1, unsigned long val2,
563 unsigned long carry_in)
564 {
565 unsigned long val = val1 + val2;
566
567 if (carry_in)
568 ++val;
569 regs->gpr[rd] = val;
570 #ifdef __powerpc64__
571 if (!(regs->msr & MSR_64BIT)) {
572 val = (unsigned int) val;
573 val1 = (unsigned int) val1;
574 }
575 #endif
576 if (val < val1 || (carry_in && val == val1))
577 regs->xer |= XER_CA;
578 else
579 regs->xer &= ~XER_CA;
580 }
581
582 static void __kprobes do_cmp_signed(struct pt_regs *regs, long v1, long v2,
583 int crfld)
584 {
585 unsigned int crval, shift;
586
587 crval = (regs->xer >> 31) & 1; /* get SO bit */
588 if (v1 < v2)
589 crval |= 8;
590 else if (v1 > v2)
591 crval |= 4;
592 else
593 crval |= 2;
594 shift = (7 - crfld) * 4;
595 regs->ccr = (regs->ccr & ~(0xf << shift)) | (crval << shift);
596 }
597
598 static void __kprobes do_cmp_unsigned(struct pt_regs *regs, unsigned long v1,
599 unsigned long v2, int crfld)
600 {
601 unsigned int crval, shift;
602
603 crval = (regs->xer >> 31) & 1; /* get SO bit */
604 if (v1 < v2)
605 crval |= 8;
606 else if (v1 > v2)
607 crval |= 4;
608 else
609 crval |= 2;
610 shift = (7 - crfld) * 4;
611 regs->ccr = (regs->ccr & ~(0xf << shift)) | (crval << shift);
612 }
613
614 /*
615 * Elements of 32-bit rotate and mask instructions.
616 */
617 #define MASK32(mb, me) ((0xffffffffUL >> (mb)) + \
618 ((signed long)-0x80000000L >> (me)) + ((me) >= (mb)))
619 #ifdef __powerpc64__
620 #define MASK64_L(mb) (~0UL >> (mb))
621 #define MASK64_R(me) ((signed long)-0x8000000000000000L >> (me))
622 #define MASK64(mb, me) (MASK64_L(mb) + MASK64_R(me) + ((me) >= (mb)))
623 #define DATA32(x) (((x) & 0xffffffffUL) | (((x) & 0xffffffffUL) << 32))
624 #else
625 #define DATA32(x) (x)
626 #endif
627 #define ROTATE(x, n) ((n) ? (((x) << (n)) | ((x) >> (8 * sizeof(long) - (n)))) : (x))
628
629 /*
630 * Emulate instructions that cause a transfer of control,
631 * loads and stores, and a few other instructions.
632 * Returns 1 if the step was emulated, 0 if not,
633 * or -1 if the instruction is one that should not be stepped,
634 * such as an rfid, or a mtmsrd that would clear MSR_RI.
635 */
636 int __kprobes emulate_step(struct pt_regs *regs, unsigned int instr)
637 {
638 unsigned int opcode, ra, rb, rd, spr, u;
639 unsigned long int imm;
640 unsigned long int val, val2;
641 unsigned long int ea;
642 unsigned int cr, mb, me, sh;
643 int err;
644 unsigned long old_ra, val3;
645 long ival;
646
647 opcode = instr >> 26;
648 switch (opcode) {
649 case 16: /* bc */
650 imm = (signed short)(instr & 0xfffc);
651 if ((instr & 2) == 0)
652 imm += regs->nip;
653 regs->nip += 4;
654 regs->nip = truncate_if_32bit(regs->msr, regs->nip);
655 if (instr & 1)
656 regs->link = regs->nip;
657 if (branch_taken(instr, regs))
658 regs->nip = truncate_if_32bit(regs->msr, imm);
659 return 1;
660 #ifdef CONFIG_PPC64
661 case 17: /* sc */
662 /*
663 * N.B. this uses knowledge about how the syscall
664 * entry code works. If that is changed, this will
665 * need to be changed also.
666 */
667 if (regs->gpr[0] == 0x1ebe &&
668 cpu_has_feature(CPU_FTR_REAL_LE)) {
669 regs->msr ^= MSR_LE;
670 goto instr_done;
671 }
672 regs->gpr[9] = regs->gpr[13];
673 regs->gpr[10] = MSR_KERNEL;
674 regs->gpr[11] = regs->nip + 4;
675 regs->gpr[12] = regs->msr & MSR_MASK;
676 regs->gpr[13] = (unsigned long) get_paca();
677 regs->nip = (unsigned long) &system_call_common;
678 regs->msr = MSR_KERNEL;
679 return 1;
680 #endif
681 case 18: /* b */
682 imm = instr & 0x03fffffc;
683 if (imm & 0x02000000)
684 imm -= 0x04000000;
685 if ((instr & 2) == 0)
686 imm += regs->nip;
687 if (instr & 1)
688 regs->link = truncate_if_32bit(regs->msr, regs->nip + 4);
689 imm = truncate_if_32bit(regs->msr, imm);
690 regs->nip = imm;
691 return 1;
692 case 19:
693 switch ((instr >> 1) & 0x3ff) {
694 case 16: /* bclr */
695 case 528: /* bcctr */
696 imm = (instr & 0x400)? regs->ctr: regs->link;
697 regs->nip = truncate_if_32bit(regs->msr, regs->nip + 4);
698 imm = truncate_if_32bit(regs->msr, imm);
699 if (instr & 1)
700 regs->link = regs->nip;
701 if (branch_taken(instr, regs))
702 regs->nip = imm;
703 return 1;
704
705 case 18: /* rfid, scary */
706 return -1;
707
708 case 150: /* isync */
709 isync();
710 goto instr_done;
711
712 case 33: /* crnor */
713 case 129: /* crandc */
714 case 193: /* crxor */
715 case 225: /* crnand */
716 case 257: /* crand */
717 case 289: /* creqv */
718 case 417: /* crorc */
719 case 449: /* cror */
720 ra = (instr >> 16) & 0x1f;
721 rb = (instr >> 11) & 0x1f;
722 rd = (instr >> 21) & 0x1f;
723 ra = (regs->ccr >> (31 - ra)) & 1;
724 rb = (regs->ccr >> (31 - rb)) & 1;
725 val = (instr >> (6 + ra * 2 + rb)) & 1;
726 regs->ccr = (regs->ccr & ~(1UL << (31 - rd))) |
727 (val << (31 - rd));
728 goto instr_done;
729 }
730 break;
731 case 31:
732 switch ((instr >> 1) & 0x3ff) {
733 case 598: /* sync */
734 #ifdef __powerpc64__
735 switch ((instr >> 21) & 3) {
736 case 1: /* lwsync */
737 asm volatile("lwsync" : : : "memory");
738 goto instr_done;
739 case 2: /* ptesync */
740 asm volatile("ptesync" : : : "memory");
741 goto instr_done;
742 }
743 #endif
744 mb();
745 goto instr_done;
746
747 case 854: /* eieio */
748 eieio();
749 goto instr_done;
750 }
751 break;
752 }
753
754 /* Following cases refer to regs->gpr[], so we need all regs */
755 if (!FULL_REGS(regs))
756 return 0;
757
758 rd = (instr >> 21) & 0x1f;
759 ra = (instr >> 16) & 0x1f;
760 rb = (instr >> 11) & 0x1f;
761
762 switch (opcode) {
763 case 7: /* mulli */
764 regs->gpr[rd] = regs->gpr[ra] * (short) instr;
765 goto instr_done;
766
767 case 8: /* subfic */
768 imm = (short) instr;
769 add_with_carry(regs, rd, ~regs->gpr[ra], imm, 1);
770 goto instr_done;
771
772 case 10: /* cmpli */
773 imm = (unsigned short) instr;
774 val = regs->gpr[ra];
775 #ifdef __powerpc64__
776 if ((rd & 1) == 0)
777 val = (unsigned int) val;
778 #endif
779 do_cmp_unsigned(regs, val, imm, rd >> 2);
780 goto instr_done;
781
782 case 11: /* cmpi */
783 imm = (short) instr;
784 val = regs->gpr[ra];
785 #ifdef __powerpc64__
786 if ((rd & 1) == 0)
787 val = (int) val;
788 #endif
789 do_cmp_signed(regs, val, imm, rd >> 2);
790 goto instr_done;
791
792 case 12: /* addic */
793 imm = (short) instr;
794 add_with_carry(regs, rd, regs->gpr[ra], imm, 0);
795 goto instr_done;
796
797 case 13: /* addic. */
798 imm = (short) instr;
799 add_with_carry(regs, rd, regs->gpr[ra], imm, 0);
800 set_cr0(regs, rd);
801 goto instr_done;
802
803 case 14: /* addi */
804 imm = (short) instr;
805 if (ra)
806 imm += regs->gpr[ra];
807 regs->gpr[rd] = imm;
808 goto instr_done;
809
810 case 15: /* addis */
811 imm = ((short) instr) << 16;
812 if (ra)
813 imm += regs->gpr[ra];
814 regs->gpr[rd] = imm;
815 goto instr_done;
816
817 case 20: /* rlwimi */
818 mb = (instr >> 6) & 0x1f;
819 me = (instr >> 1) & 0x1f;
820 val = DATA32(regs->gpr[rd]);
821 imm = MASK32(mb, me);
822 regs->gpr[ra] = (regs->gpr[ra] & ~imm) | (ROTATE(val, rb) & imm);
823 goto logical_done;
824
825 case 21: /* rlwinm */
826 mb = (instr >> 6) & 0x1f;
827 me = (instr >> 1) & 0x1f;
828 val = DATA32(regs->gpr[rd]);
829 regs->gpr[ra] = ROTATE(val, rb) & MASK32(mb, me);
830 goto logical_done;
831
832 case 23: /* rlwnm */
833 mb = (instr >> 6) & 0x1f;
834 me = (instr >> 1) & 0x1f;
835 rb = regs->gpr[rb] & 0x1f;
836 val = DATA32(regs->gpr[rd]);
837 regs->gpr[ra] = ROTATE(val, rb) & MASK32(mb, me);
838 goto logical_done;
839
840 case 24: /* ori */
841 imm = (unsigned short) instr;
842 regs->gpr[ra] = regs->gpr[rd] | imm;
843 goto instr_done;
844
845 case 25: /* oris */
846 imm = (unsigned short) instr;
847 regs->gpr[ra] = regs->gpr[rd] | (imm << 16);
848 goto instr_done;
849
850 case 26: /* xori */
851 imm = (unsigned short) instr;
852 regs->gpr[ra] = regs->gpr[rd] ^ imm;
853 goto instr_done;
854
855 case 27: /* xoris */
856 imm = (unsigned short) instr;
857 regs->gpr[ra] = regs->gpr[rd] ^ (imm << 16);
858 goto instr_done;
859
860 case 28: /* andi. */
861 imm = (unsigned short) instr;
862 regs->gpr[ra] = regs->gpr[rd] & imm;
863 set_cr0(regs, ra);
864 goto instr_done;
865
866 case 29: /* andis. */
867 imm = (unsigned short) instr;
868 regs->gpr[ra] = regs->gpr[rd] & (imm << 16);
869 set_cr0(regs, ra);
870 goto instr_done;
871
872 #ifdef __powerpc64__
873 case 30: /* rld* */
874 mb = ((instr >> 6) & 0x1f) | (instr & 0x20);
875 val = regs->gpr[rd];
876 if ((instr & 0x10) == 0) {
877 sh = rb | ((instr & 2) << 4);
878 val = ROTATE(val, sh);
879 switch ((instr >> 2) & 3) {
880 case 0: /* rldicl */
881 regs->gpr[ra] = val & MASK64_L(mb);
882 goto logical_done;
883 case 1: /* rldicr */
884 regs->gpr[ra] = val & MASK64_R(mb);
885 goto logical_done;
886 case 2: /* rldic */
887 regs->gpr[ra] = val & MASK64(mb, 63 - sh);
888 goto logical_done;
889 case 3: /* rldimi */
890 imm = MASK64(mb, 63 - sh);
891 regs->gpr[ra] = (regs->gpr[ra] & ~imm) |
892 (val & imm);
893 goto logical_done;
894 }
895 } else {
896 sh = regs->gpr[rb] & 0x3f;
897 val = ROTATE(val, sh);
898 switch ((instr >> 1) & 7) {
899 case 0: /* rldcl */
900 regs->gpr[ra] = val & MASK64_L(mb);
901 goto logical_done;
902 case 1: /* rldcr */
903 regs->gpr[ra] = val & MASK64_R(mb);
904 goto logical_done;
905 }
906 }
907 #endif
908
909 case 31:
910 switch ((instr >> 1) & 0x3ff) {
911 case 83: /* mfmsr */
912 if (regs->msr & MSR_PR)
913 break;
914 regs->gpr[rd] = regs->msr & MSR_MASK;
915 goto instr_done;
916 case 146: /* mtmsr */
917 if (regs->msr & MSR_PR)
918 break;
919 imm = regs->gpr[rd];
920 if ((imm & MSR_RI) == 0)
921 /* can't step mtmsr that would clear MSR_RI */
922 return -1;
923 regs->msr = imm;
924 goto instr_done;
925 #ifdef CONFIG_PPC64
926 case 178: /* mtmsrd */
927 /* only MSR_EE and MSR_RI get changed if bit 15 set */
928 /* mtmsrd doesn't change MSR_HV and MSR_ME */
929 if (regs->msr & MSR_PR)
930 break;
931 imm = (instr & 0x10000)? 0x8002: 0xefffffffffffefffUL;
932 imm = (regs->msr & MSR_MASK & ~imm)
933 | (regs->gpr[rd] & imm);
934 if ((imm & MSR_RI) == 0)
935 /* can't step mtmsrd that would clear MSR_RI */
936 return -1;
937 regs->msr = imm;
938 goto instr_done;
939 #endif
940 case 19: /* mfcr */
941 regs->gpr[rd] = regs->ccr;
942 regs->gpr[rd] &= 0xffffffffUL;
943 goto instr_done;
944
945 case 144: /* mtcrf */
946 imm = 0xf0000000UL;
947 val = regs->gpr[rd];
948 for (sh = 0; sh < 8; ++sh) {
949 if (instr & (0x80000 >> sh))
950 regs->ccr = (regs->ccr & ~imm) |
951 (val & imm);
952 imm >>= 4;
953 }
954 goto instr_done;
955
956 case 339: /* mfspr */
957 spr = (instr >> 11) & 0x3ff;
958 switch (spr) {
959 case 0x20: /* mfxer */
960 regs->gpr[rd] = regs->xer;
961 regs->gpr[rd] &= 0xffffffffUL;
962 goto instr_done;
963 case 0x100: /* mflr */
964 regs->gpr[rd] = regs->link;
965 goto instr_done;
966 case 0x120: /* mfctr */
967 regs->gpr[rd] = regs->ctr;
968 goto instr_done;
969 }
970 break;
971
972 case 467: /* mtspr */
973 spr = (instr >> 11) & 0x3ff;
974 switch (spr) {
975 case 0x20: /* mtxer */
976 regs->xer = (regs->gpr[rd] & 0xffffffffUL);
977 goto instr_done;
978 case 0x100: /* mtlr */
979 regs->link = regs->gpr[rd];
980 goto instr_done;
981 case 0x120: /* mtctr */
982 regs->ctr = regs->gpr[rd];
983 goto instr_done;
984 }
985 break;
986
987 /*
988 * Compare instructions
989 */
990 case 0: /* cmp */
991 val = regs->gpr[ra];
992 val2 = regs->gpr[rb];
993 #ifdef __powerpc64__
994 if ((rd & 1) == 0) {
995 /* word (32-bit) compare */
996 val = (int) val;
997 val2 = (int) val2;
998 }
999 #endif
1000 do_cmp_signed(regs, val, val2, rd >> 2);
1001 goto instr_done;
1002
1003 case 32: /* cmpl */
1004 val = regs->gpr[ra];
1005 val2 = regs->gpr[rb];
1006 #ifdef __powerpc64__
1007 if ((rd & 1) == 0) {
1008 /* word (32-bit) compare */
1009 val = (unsigned int) val;
1010 val2 = (unsigned int) val2;
1011 }
1012 #endif
1013 do_cmp_unsigned(regs, val, val2, rd >> 2);
1014 goto instr_done;
1015
1016 /*
1017 * Arithmetic instructions
1018 */
1019 case 8: /* subfc */
1020 add_with_carry(regs, rd, ~regs->gpr[ra],
1021 regs->gpr[rb], 1);
1022 goto arith_done;
1023 #ifdef __powerpc64__
1024 case 9: /* mulhdu */
1025 asm("mulhdu %0,%1,%2" : "=r" (regs->gpr[rd]) :
1026 "r" (regs->gpr[ra]), "r" (regs->gpr[rb]));
1027 goto arith_done;
1028 #endif
1029 case 10: /* addc */
1030 add_with_carry(regs, rd, regs->gpr[ra],
1031 regs->gpr[rb], 0);
1032 goto arith_done;
1033
1034 case 11: /* mulhwu */
1035 asm("mulhwu %0,%1,%2" : "=r" (regs->gpr[rd]) :
1036 "r" (regs->gpr[ra]), "r" (regs->gpr[rb]));
1037 goto arith_done;
1038
1039 case 40: /* subf */
1040 regs->gpr[rd] = regs->gpr[rb] - regs->gpr[ra];
1041 goto arith_done;
1042 #ifdef __powerpc64__
1043 case 73: /* mulhd */
1044 asm("mulhd %0,%1,%2" : "=r" (regs->gpr[rd]) :
1045 "r" (regs->gpr[ra]), "r" (regs->gpr[rb]));
1046 goto arith_done;
1047 #endif
1048 case 75: /* mulhw */
1049 asm("mulhw %0,%1,%2" : "=r" (regs->gpr[rd]) :
1050 "r" (regs->gpr[ra]), "r" (regs->gpr[rb]));
1051 goto arith_done;
1052
1053 case 104: /* neg */
1054 regs->gpr[rd] = -regs->gpr[ra];
1055 goto arith_done;
1056
1057 case 136: /* subfe */
1058 add_with_carry(regs, rd, ~regs->gpr[ra], regs->gpr[rb],
1059 regs->xer & XER_CA);
1060 goto arith_done;
1061
1062 case 138: /* adde */
1063 add_with_carry(regs, rd, regs->gpr[ra], regs->gpr[rb],
1064 regs->xer & XER_CA);
1065 goto arith_done;
1066
1067 case 200: /* subfze */
1068 add_with_carry(regs, rd, ~regs->gpr[ra], 0L,
1069 regs->xer & XER_CA);
1070 goto arith_done;
1071
1072 case 202: /* addze */
1073 add_with_carry(regs, rd, regs->gpr[ra], 0L,
1074 regs->xer & XER_CA);
1075 goto arith_done;
1076
1077 case 232: /* subfme */
1078 add_with_carry(regs, rd, ~regs->gpr[ra], -1L,
1079 regs->xer & XER_CA);
1080 goto arith_done;
1081 #ifdef __powerpc64__
1082 case 233: /* mulld */
1083 regs->gpr[rd] = regs->gpr[ra] * regs->gpr[rb];
1084 goto arith_done;
1085 #endif
1086 case 234: /* addme */
1087 add_with_carry(regs, rd, regs->gpr[ra], -1L,
1088 regs->xer & XER_CA);
1089 goto arith_done;
1090
1091 case 235: /* mullw */
1092 regs->gpr[rd] = (unsigned int) regs->gpr[ra] *
1093 (unsigned int) regs->gpr[rb];
1094 goto arith_done;
1095
1096 case 266: /* add */
1097 regs->gpr[rd] = regs->gpr[ra] + regs->gpr[rb];
1098 goto arith_done;
1099 #ifdef __powerpc64__
1100 case 457: /* divdu */
1101 regs->gpr[rd] = regs->gpr[ra] / regs->gpr[rb];
1102 goto arith_done;
1103 #endif
1104 case 459: /* divwu */
1105 regs->gpr[rd] = (unsigned int) regs->gpr[ra] /
1106 (unsigned int) regs->gpr[rb];
1107 goto arith_done;
1108 #ifdef __powerpc64__
1109 case 489: /* divd */
1110 regs->gpr[rd] = (long int) regs->gpr[ra] /
1111 (long int) regs->gpr[rb];
1112 goto arith_done;
1113 #endif
1114 case 491: /* divw */
1115 regs->gpr[rd] = (int) regs->gpr[ra] /
1116 (int) regs->gpr[rb];
1117 goto arith_done;
1118
1119
1120 /*
1121 * Logical instructions
1122 */
1123 case 26: /* cntlzw */
1124 asm("cntlzw %0,%1" : "=r" (regs->gpr[ra]) :
1125 "r" (regs->gpr[rd]));
1126 goto logical_done;
1127 #ifdef __powerpc64__
1128 case 58: /* cntlzd */
1129 asm("cntlzd %0,%1" : "=r" (regs->gpr[ra]) :
1130 "r" (regs->gpr[rd]));
1131 goto logical_done;
1132 #endif
1133 case 28: /* and */
1134 regs->gpr[ra] = regs->gpr[rd] & regs->gpr[rb];
1135 goto logical_done;
1136
1137 case 60: /* andc */
1138 regs->gpr[ra] = regs->gpr[rd] & ~regs->gpr[rb];
1139 goto logical_done;
1140
1141 case 124: /* nor */
1142 regs->gpr[ra] = ~(regs->gpr[rd] | regs->gpr[rb]);
1143 goto logical_done;
1144
1145 case 284: /* xor */
1146 regs->gpr[ra] = ~(regs->gpr[rd] ^ regs->gpr[rb]);
1147 goto logical_done;
1148
1149 case 316: /* xor */
1150 regs->gpr[ra] = regs->gpr[rd] ^ regs->gpr[rb];
1151 goto logical_done;
1152
1153 case 412: /* orc */
1154 regs->gpr[ra] = regs->gpr[rd] | ~regs->gpr[rb];
1155 goto logical_done;
1156
1157 case 444: /* or */
1158 regs->gpr[ra] = regs->gpr[rd] | regs->gpr[rb];
1159 goto logical_done;
1160
1161 case 476: /* nand */
1162 regs->gpr[ra] = ~(regs->gpr[rd] & regs->gpr[rb]);
1163 goto logical_done;
1164
1165 case 922: /* extsh */
1166 regs->gpr[ra] = (signed short) regs->gpr[rd];
1167 goto logical_done;
1168
1169 case 954: /* extsb */
1170 regs->gpr[ra] = (signed char) regs->gpr[rd];
1171 goto logical_done;
1172 #ifdef __powerpc64__
1173 case 986: /* extsw */
1174 regs->gpr[ra] = (signed int) regs->gpr[rd];
1175 goto logical_done;
1176 #endif
1177
1178 /*
1179 * Shift instructions
1180 */
1181 case 24: /* slw */
1182 sh = regs->gpr[rb] & 0x3f;
1183 if (sh < 32)
1184 regs->gpr[ra] = (regs->gpr[rd] << sh) & 0xffffffffUL;
1185 else
1186 regs->gpr[ra] = 0;
1187 goto logical_done;
1188
1189 case 536: /* srw */
1190 sh = regs->gpr[rb] & 0x3f;
1191 if (sh < 32)
1192 regs->gpr[ra] = (regs->gpr[rd] & 0xffffffffUL) >> sh;
1193 else
1194 regs->gpr[ra] = 0;
1195 goto logical_done;
1196
1197 case 792: /* sraw */
1198 sh = regs->gpr[rb] & 0x3f;
1199 ival = (signed int) regs->gpr[rd];
1200 regs->gpr[ra] = ival >> (sh < 32 ? sh : 31);
1201 if (ival < 0 && (sh >= 32 || (ival & ((1 << sh) - 1)) != 0))
1202 regs->xer |= XER_CA;
1203 else
1204 regs->xer &= ~XER_CA;
1205 goto logical_done;
1206
1207 case 824: /* srawi */
1208 sh = rb;
1209 ival = (signed int) regs->gpr[rd];
1210 regs->gpr[ra] = ival >> sh;
1211 if (ival < 0 && (ival & ((1 << sh) - 1)) != 0)
1212 regs->xer |= XER_CA;
1213 else
1214 regs->xer &= ~XER_CA;
1215 goto logical_done;
1216
1217 #ifdef __powerpc64__
1218 case 27: /* sld */
1219 sh = regs->gpr[rd] & 0x7f;
1220 if (sh < 64)
1221 regs->gpr[ra] = regs->gpr[rd] << sh;
1222 else
1223 regs->gpr[ra] = 0;
1224 goto logical_done;
1225
1226 case 539: /* srd */
1227 sh = regs->gpr[rb] & 0x7f;
1228 if (sh < 64)
1229 regs->gpr[ra] = regs->gpr[rd] >> sh;
1230 else
1231 regs->gpr[ra] = 0;
1232 goto logical_done;
1233
1234 case 794: /* srad */
1235 sh = regs->gpr[rb] & 0x7f;
1236 ival = (signed long int) regs->gpr[rd];
1237 regs->gpr[ra] = ival >> (sh < 64 ? sh : 63);
1238 if (ival < 0 && (sh >= 64 || (ival & ((1 << sh) - 1)) != 0))
1239 regs->xer |= XER_CA;
1240 else
1241 regs->xer &= ~XER_CA;
1242 goto logical_done;
1243
1244 case 826: /* sradi with sh_5 = 0 */
1245 case 827: /* sradi with sh_5 = 1 */
1246 sh = rb | ((instr & 2) << 4);
1247 ival = (signed long int) regs->gpr[rd];
1248 regs->gpr[ra] = ival >> sh;
1249 if (ival < 0 && (ival & ((1 << sh) - 1)) != 0)
1250 regs->xer |= XER_CA;
1251 else
1252 regs->xer &= ~XER_CA;
1253 goto logical_done;
1254 #endif /* __powerpc64__ */
1255
1256 /*
1257 * Cache instructions
1258 */
1259 case 54: /* dcbst */
1260 ea = xform_ea(instr, regs, 0);
1261 if (!address_ok(regs, ea, 8))
1262 return 0;
1263 err = 0;
1264 __cacheop_user_asmx(ea, err, "dcbst");
1265 if (err)
1266 return 0;
1267 goto instr_done;
1268
1269 case 86: /* dcbf */
1270 ea = xform_ea(instr, regs, 0);
1271 if (!address_ok(regs, ea, 8))
1272 return 0;
1273 err = 0;
1274 __cacheop_user_asmx(ea, err, "dcbf");
1275 if (err)
1276 return 0;
1277 goto instr_done;
1278
1279 case 246: /* dcbtst */
1280 if (rd == 0) {
1281 ea = xform_ea(instr, regs, 0);
1282 prefetchw((void *) ea);
1283 }
1284 goto instr_done;
1285
1286 case 278: /* dcbt */
1287 if (rd == 0) {
1288 ea = xform_ea(instr, regs, 0);
1289 prefetch((void *) ea);
1290 }
1291 goto instr_done;
1292
1293 }
1294 break;
1295 }
1296
1297 /*
1298 * Following cases are for loads and stores, so bail out
1299 * if we're in little-endian mode.
1300 */
1301 if (regs->msr & MSR_LE)
1302 return 0;
1303
1304 /*
1305 * Save register RA in case it's an update form load or store
1306 * and the access faults.
1307 */
1308 old_ra = regs->gpr[ra];
1309
1310 switch (opcode) {
1311 case 31:
1312 u = instr & 0x40;
1313 switch ((instr >> 1) & 0x3ff) {
1314 case 20: /* lwarx */
1315 ea = xform_ea(instr, regs, 0);
1316 if (ea & 3)
1317 break; /* can't handle misaligned */
1318 err = -EFAULT;
1319 if (!address_ok(regs, ea, 4))
1320 goto ldst_done;
1321 err = 0;
1322 __get_user_asmx(val, ea, err, "lwarx");
1323 if (!err)
1324 regs->gpr[rd] = val;
1325 goto ldst_done;
1326
1327 case 150: /* stwcx. */
1328 ea = xform_ea(instr, regs, 0);
1329 if (ea & 3)
1330 break; /* can't handle misaligned */
1331 err = -EFAULT;
1332 if (!address_ok(regs, ea, 4))
1333 goto ldst_done;
1334 err = 0;
1335 __put_user_asmx(regs->gpr[rd], ea, err, "stwcx.", cr);
1336 if (!err)
1337 regs->ccr = (regs->ccr & 0x0fffffff) |
1338 (cr & 0xe0000000) |
1339 ((regs->xer >> 3) & 0x10000000);
1340 goto ldst_done;
1341
1342 #ifdef __powerpc64__
1343 case 84: /* ldarx */
1344 ea = xform_ea(instr, regs, 0);
1345 if (ea & 7)
1346 break; /* can't handle misaligned */
1347 err = -EFAULT;
1348 if (!address_ok(regs, ea, 8))
1349 goto ldst_done;
1350 err = 0;
1351 __get_user_asmx(val, ea, err, "ldarx");
1352 if (!err)
1353 regs->gpr[rd] = val;
1354 goto ldst_done;
1355
1356 case 214: /* stdcx. */
1357 ea = xform_ea(instr, regs, 0);
1358 if (ea & 7)
1359 break; /* can't handle misaligned */
1360 err = -EFAULT;
1361 if (!address_ok(regs, ea, 8))
1362 goto ldst_done;
1363 err = 0;
1364 __put_user_asmx(regs->gpr[rd], ea, err, "stdcx.", cr);
1365 if (!err)
1366 regs->ccr = (regs->ccr & 0x0fffffff) |
1367 (cr & 0xe0000000) |
1368 ((regs->xer >> 3) & 0x10000000);
1369 goto ldst_done;
1370
1371 case 21: /* ldx */
1372 case 53: /* ldux */
1373 err = read_mem(&regs->gpr[rd], xform_ea(instr, regs, u),
1374 8, regs);
1375 goto ldst_done;
1376 #endif
1377
1378 case 23: /* lwzx */
1379 case 55: /* lwzux */
1380 err = read_mem(&regs->gpr[rd], xform_ea(instr, regs, u),
1381 4, regs);
1382 goto ldst_done;
1383
1384 case 87: /* lbzx */
1385 case 119: /* lbzux */
1386 err = read_mem(&regs->gpr[rd], xform_ea(instr, regs, u),
1387 1, regs);
1388 goto ldst_done;
1389
1390 #ifdef CONFIG_ALTIVEC
1391 case 103: /* lvx */
1392 case 359: /* lvxl */
1393 if (!(regs->msr & MSR_VEC))
1394 break;
1395 ea = xform_ea(instr, regs, 0);
1396 err = do_vec_load(rd, do_lvx, ea, regs);
1397 goto ldst_done;
1398
1399 case 231: /* stvx */
1400 case 487: /* stvxl */
1401 if (!(regs->msr & MSR_VEC))
1402 break;
1403 ea = xform_ea(instr, regs, 0);
1404 err = do_vec_store(rd, do_stvx, ea, regs);
1405 goto ldst_done;
1406 #endif /* CONFIG_ALTIVEC */
1407
1408 #ifdef __powerpc64__
1409 case 149: /* stdx */
1410 case 181: /* stdux */
1411 val = regs->gpr[rd];
1412 err = write_mem(val, xform_ea(instr, regs, u), 8, regs);
1413 goto ldst_done;
1414 #endif
1415
1416 case 151: /* stwx */
1417 case 183: /* stwux */
1418 val = regs->gpr[rd];
1419 err = write_mem(val, xform_ea(instr, regs, u), 4, regs);
1420 goto ldst_done;
1421
1422 case 215: /* stbx */
1423 case 247: /* stbux */
1424 val = regs->gpr[rd];
1425 err = write_mem(val, xform_ea(instr, regs, u), 1, regs);
1426 goto ldst_done;
1427
1428 case 279: /* lhzx */
1429 case 311: /* lhzux */
1430 err = read_mem(&regs->gpr[rd], xform_ea(instr, regs, u),
1431 2, regs);
1432 goto ldst_done;
1433
1434 #ifdef __powerpc64__
1435 case 341: /* lwax */
1436 case 373: /* lwaux */
1437 err = read_mem(&regs->gpr[rd], xform_ea(instr, regs, u),
1438 4, regs);
1439 if (!err)
1440 regs->gpr[rd] = (signed int) regs->gpr[rd];
1441 goto ldst_done;
1442 #endif
1443
1444 case 343: /* lhax */
1445 case 375: /* lhaux */
1446 err = read_mem(&regs->gpr[rd], xform_ea(instr, regs, u),
1447 2, regs);
1448 if (!err)
1449 regs->gpr[rd] = (signed short) regs->gpr[rd];
1450 goto ldst_done;
1451
1452 case 407: /* sthx */
1453 case 439: /* sthux */
1454 val = regs->gpr[rd];
1455 err = write_mem(val, xform_ea(instr, regs, u), 2, regs);
1456 goto ldst_done;
1457
1458 #ifdef __powerpc64__
1459 case 532: /* ldbrx */
1460 err = read_mem(&val, xform_ea(instr, regs, 0), 8, regs);
1461 if (!err)
1462 regs->gpr[rd] = byterev_8(val);
1463 goto ldst_done;
1464
1465 #endif
1466
1467 case 534: /* lwbrx */
1468 err = read_mem(&val, xform_ea(instr, regs, 0), 4, regs);
1469 if (!err)
1470 regs->gpr[rd] = byterev_4(val);
1471 goto ldst_done;
1472
1473 #ifdef CONFIG_PPC_FPU
1474 case 535: /* lfsx */
1475 case 567: /* lfsux */
1476 if (!(regs->msr & MSR_FP))
1477 break;
1478 ea = xform_ea(instr, regs, u);
1479 err = do_fp_load(rd, do_lfs, ea, 4, regs);
1480 goto ldst_done;
1481
1482 case 599: /* lfdx */
1483 case 631: /* lfdux */
1484 if (!(regs->msr & MSR_FP))
1485 break;
1486 ea = xform_ea(instr, regs, u);
1487 err = do_fp_load(rd, do_lfd, ea, 8, regs);
1488 goto ldst_done;
1489
1490 case 663: /* stfsx */
1491 case 695: /* stfsux */
1492 if (!(regs->msr & MSR_FP))
1493 break;
1494 ea = xform_ea(instr, regs, u);
1495 err = do_fp_store(rd, do_stfs, ea, 4, regs);
1496 goto ldst_done;
1497
1498 case 727: /* stfdx */
1499 case 759: /* stfdux */
1500 if (!(regs->msr & MSR_FP))
1501 break;
1502 ea = xform_ea(instr, regs, u);
1503 err = do_fp_store(rd, do_stfd, ea, 8, regs);
1504 goto ldst_done;
1505 #endif
1506
1507 #ifdef __powerpc64__
1508 case 660: /* stdbrx */
1509 val = byterev_8(regs->gpr[rd]);
1510 err = write_mem(val, xform_ea(instr, regs, 0), 8, regs);
1511 goto ldst_done;
1512
1513 #endif
1514 case 662: /* stwbrx */
1515 val = byterev_4(regs->gpr[rd]);
1516 err = write_mem(val, xform_ea(instr, regs, 0), 4, regs);
1517 goto ldst_done;
1518
1519 case 790: /* lhbrx */
1520 err = read_mem(&val, xform_ea(instr, regs, 0), 2, regs);
1521 if (!err)
1522 regs->gpr[rd] = byterev_2(val);
1523 goto ldst_done;
1524
1525 case 918: /* sthbrx */
1526 val = byterev_2(regs->gpr[rd]);
1527 err = write_mem(val, xform_ea(instr, regs, 0), 2, regs);
1528 goto ldst_done;
1529
1530 #ifdef CONFIG_VSX
1531 case 844: /* lxvd2x */
1532 case 876: /* lxvd2ux */
1533 if (!(regs->msr & MSR_VSX))
1534 break;
1535 rd |= (instr & 1) << 5;
1536 ea = xform_ea(instr, regs, u);
1537 err = do_vsx_load(rd, do_lxvd2x, ea, regs);
1538 goto ldst_done;
1539
1540 case 972: /* stxvd2x */
1541 case 1004: /* stxvd2ux */
1542 if (!(regs->msr & MSR_VSX))
1543 break;
1544 rd |= (instr & 1) << 5;
1545 ea = xform_ea(instr, regs, u);
1546 err = do_vsx_store(rd, do_stxvd2x, ea, regs);
1547 goto ldst_done;
1548
1549 #endif /* CONFIG_VSX */
1550 }
1551 break;
1552
1553 case 32: /* lwz */
1554 case 33: /* lwzu */
1555 err = read_mem(&regs->gpr[rd], dform_ea(instr, regs), 4, regs);
1556 goto ldst_done;
1557
1558 case 34: /* lbz */
1559 case 35: /* lbzu */
1560 err = read_mem(&regs->gpr[rd], dform_ea(instr, regs), 1, regs);
1561 goto ldst_done;
1562
1563 case 36: /* stw */
1564 val = regs->gpr[rd];
1565 err = write_mem(val, dform_ea(instr, regs), 4, regs);
1566 goto ldst_done;
1567
1568 case 37: /* stwu */
1569 val = regs->gpr[rd];
1570 val3 = dform_ea(instr, regs);
1571 /*
1572 * For PPC32 we always use stwu to change stack point with r1. So
1573 * this emulated store may corrupt the exception frame, now we
1574 * have to provide the exception frame trampoline, which is pushed
1575 * below the kprobed function stack. So we only update gpr[1] but
1576 * don't emulate the real store operation. We will do real store
1577 * operation safely in exception return code by checking this flag.
1578 */
1579 if ((ra == 1) && !(regs->msr & MSR_PR) \
1580 && (val3 >= (regs->gpr[1] - STACK_INT_FRAME_SIZE))) {
1581 #ifdef CONFIG_PPC32
1582 /*
1583 * Check if we will touch kernel sack overflow
1584 */
1585 if (val3 - STACK_INT_FRAME_SIZE <= current->thread.ksp_limit) {
1586 printk(KERN_CRIT "Can't kprobe this since Kernel stack overflow.\n");
1587 err = -EINVAL;
1588 break;
1589 }
1590 #endif /* CONFIG_PPC32 */
1591 /*
1592 * Check if we already set since that means we'll
1593 * lose the previous value.
1594 */
1595 WARN_ON(test_thread_flag(TIF_EMULATE_STACK_STORE));
1596 set_thread_flag(TIF_EMULATE_STACK_STORE);
1597 err = 0;
1598 } else
1599 err = write_mem(val, val3, 4, regs);
1600 goto ldst_done;
1601
1602 case 38: /* stb */
1603 case 39: /* stbu */
1604 val = regs->gpr[rd];
1605 err = write_mem(val, dform_ea(instr, regs), 1, regs);
1606 goto ldst_done;
1607
1608 case 40: /* lhz */
1609 case 41: /* lhzu */
1610 err = read_mem(&regs->gpr[rd], dform_ea(instr, regs), 2, regs);
1611 goto ldst_done;
1612
1613 case 42: /* lha */
1614 case 43: /* lhau */
1615 err = read_mem(&regs->gpr[rd], dform_ea(instr, regs), 2, regs);
1616 if (!err)
1617 regs->gpr[rd] = (signed short) regs->gpr[rd];
1618 goto ldst_done;
1619
1620 case 44: /* sth */
1621 case 45: /* sthu */
1622 val = regs->gpr[rd];
1623 err = write_mem(val, dform_ea(instr, regs), 2, regs);
1624 goto ldst_done;
1625
1626 case 46: /* lmw */
1627 ra = (instr >> 16) & 0x1f;
1628 if (ra >= rd)
1629 break; /* invalid form, ra in range to load */
1630 ea = dform_ea(instr, regs);
1631 do {
1632 err = read_mem(&regs->gpr[rd], ea, 4, regs);
1633 if (err)
1634 return 0;
1635 ea += 4;
1636 } while (++rd < 32);
1637 goto instr_done;
1638
1639 case 47: /* stmw */
1640 ea = dform_ea(instr, regs);
1641 do {
1642 err = write_mem(regs->gpr[rd], ea, 4, regs);
1643 if (err)
1644 return 0;
1645 ea += 4;
1646 } while (++rd < 32);
1647 goto instr_done;
1648
1649 #ifdef CONFIG_PPC_FPU
1650 case 48: /* lfs */
1651 case 49: /* lfsu */
1652 if (!(regs->msr & MSR_FP))
1653 break;
1654 ea = dform_ea(instr, regs);
1655 err = do_fp_load(rd, do_lfs, ea, 4, regs);
1656 goto ldst_done;
1657
1658 case 50: /* lfd */
1659 case 51: /* lfdu */
1660 if (!(regs->msr & MSR_FP))
1661 break;
1662 ea = dform_ea(instr, regs);
1663 err = do_fp_load(rd, do_lfd, ea, 8, regs);
1664 goto ldst_done;
1665
1666 case 52: /* stfs */
1667 case 53: /* stfsu */
1668 if (!(regs->msr & MSR_FP))
1669 break;
1670 ea = dform_ea(instr, regs);
1671 err = do_fp_store(rd, do_stfs, ea, 4, regs);
1672 goto ldst_done;
1673
1674 case 54: /* stfd */
1675 case 55: /* stfdu */
1676 if (!(regs->msr & MSR_FP))
1677 break;
1678 ea = dform_ea(instr, regs);
1679 err = do_fp_store(rd, do_stfd, ea, 8, regs);
1680 goto ldst_done;
1681 #endif
1682
1683 #ifdef __powerpc64__
1684 case 58: /* ld[u], lwa */
1685 switch (instr & 3) {
1686 case 0: /* ld */
1687 err = read_mem(&regs->gpr[rd], dsform_ea(instr, regs),
1688 8, regs);
1689 goto ldst_done;
1690 case 1: /* ldu */
1691 err = read_mem(&regs->gpr[rd], dsform_ea(instr, regs),
1692 8, regs);
1693 goto ldst_done;
1694 case 2: /* lwa */
1695 err = read_mem(&regs->gpr[rd], dsform_ea(instr, regs),
1696 4, regs);
1697 if (!err)
1698 regs->gpr[rd] = (signed int) regs->gpr[rd];
1699 goto ldst_done;
1700 }
1701 break;
1702
1703 case 62: /* std[u] */
1704 val = regs->gpr[rd];
1705 switch (instr & 3) {
1706 case 0: /* std */
1707 err = write_mem(val, dsform_ea(instr, regs), 8, regs);
1708 goto ldst_done;
1709 case 1: /* stdu */
1710 err = write_mem(val, dsform_ea(instr, regs), 8, regs);
1711 goto ldst_done;
1712 }
1713 break;
1714 #endif /* __powerpc64__ */
1715
1716 }
1717 err = -EINVAL;
1718
1719 ldst_done:
1720 if (err) {
1721 regs->gpr[ra] = old_ra;
1722 return 0; /* invoke DSI if -EFAULT? */
1723 }
1724 instr_done:
1725 regs->nip = truncate_if_32bit(regs->msr, regs->nip + 4);
1726 return 1;
1727
1728 logical_done:
1729 if (instr & 1)
1730 set_cr0(regs, ra);
1731 goto instr_done;
1732
1733 arith_done:
1734 if (instr & 1)
1735 set_cr0(regs, rd);
1736 goto instr_done;
1737 }
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