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