arch/sparc/kernel/visemul.c

   1 /* visemul.c: Emulation of VIS instructions.
   2  *
   3  * Copyright (C) 2006 David S. Miller (davem@davemloft.net)
   4  */
   5 #include <linux/kernel.h>
   6 #include <linux/errno.h>
   7 #include <linux/thread_info.h>
   8
   9 #include <asm/ptrace.h>
  10 #include <asm/pstate.h>
  11 #include <asm/system.h>
  12 #include <asm/fpumacro.h>
  13 #include <asm/uaccess.h>
  14
  15 /* OPF field of various VIS instructions.  */
  16
  17 /* 000111011 - four 16-bit packs  */
  18 #define FPACK16_OPF     0x03b
  19
  20 /* 000111010 - two 32-bit packs  */
  21 #define FPACK32_OPF     0x03a
  22
  23 /* 000111101 - four 16-bit packs  */
  24 #define FPACKFIX_OPF    0x03d
  25
  26 /* 001001101 - four 16-bit expands  */
  27 #define FEXPAND_OPF     0x04d
  28
  29 /* 001001011 - two 32-bit merges */
  30 #define FPMERGE_OPF     0x04b
  31
  32 /* 000110001 - 8-by-16-bit partitoned product  */
  33 #define FMUL8x16_OPF    0x031
  34
  35 /* 000110011 - 8-by-16-bit upper alpha partitioned product  */
  36 #define FMUL8x16AU_OPF  0x033
  37
  38 /* 000110101 - 8-by-16-bit lower alpha partitioned product  */
  39 #define FMUL8x16AL_OPF  0x035
  40
  41 /* 000110110 - upper 8-by-16-bit partitioned product  */
  42 #define FMUL8SUx16_OPF  0x036
  43
  44 /* 000110111 - lower 8-by-16-bit partitioned product  */
  45 #define FMUL8ULx16_OPF  0x037
  46
  47 /* 000111000 - upper 8-by-16-bit partitioned product  */
  48 #define FMULD8SUx16_OPF 0x038
  49
  50 /* 000111001 - lower unsigned 8-by-16-bit partitioned product  */
  51 #define FMULD8ULx16_OPF 0x039
  52
  53 /* 000101000 - four 16-bit compare; set rd if src1 > src2  */
  54 #define FCMPGT16_OPF    0x028
  55
  56 /* 000101100 - two 32-bit compare; set rd if src1 > src2  */
  57 #define FCMPGT32_OPF    0x02c
  58
  59 /* 000100000 - four 16-bit compare; set rd if src1 <= src2  */
  60 #define FCMPLE16_OPF    0x020
  61
  62 /* 000100100 - two 32-bit compare; set rd if src1 <= src2  */
  63 #define FCMPLE32_OPF    0x024
  64
  65 /* 000100010 - four 16-bit compare; set rd if src1 != src2  */
  66 #define FCMPNE16_OPF    0x022
  67
  68 /* 000100110 - two 32-bit compare; set rd if src1 != src2  */
  69 #define FCMPNE32_OPF    0x026
  70
  71 /* 000101010 - four 16-bit compare; set rd if src1 == src2  */
  72 #define FCMPEQ16_OPF    0x02a
  73
  74 /* 000101110 - two 32-bit compare; set rd if src1 == src2  */
  75 #define FCMPEQ32_OPF    0x02e
  76
  77 /* 000000000 - Eight 8-bit edge boundary processing  */
  78 #define EDGE8_OPF       0x000
  79
  80 /* 000000001 - Eight 8-bit edge boundary processing, no CC */
  81 #define EDGE8N_OPF      0x001
  82
  83 /* 000000010 - Eight 8-bit edge boundary processing, little-endian  */
  84 #define EDGE8L_OPF      0x002
  85
  86 /* 000000011 - Eight 8-bit edge boundary processing, little-endian, no CC  */
  87 #define EDGE8LN_OPF     0x003
  88
  89 /* 000000100 - Four 16-bit edge boundary processing  */
  90 #define EDGE16_OPF      0x004
  91
  92 /* 000000101 - Four 16-bit edge boundary processing, no CC  */
  93 #define EDGE16N_OPF     0x005
  94
  95 /* 000000110 - Four 16-bit edge boundary processing, little-endian  */
  96 #define EDGE16L_OPF     0x006
  97
  98 /* 000000111 - Four 16-bit edge boundary processing, little-endian, no CC  */
  99 #define EDGE16LN_OPF    0x007
 100
 101 /* 000001000 - Two 32-bit edge boundary processing  */
 102 #define EDGE32_OPF      0x008
 103
 104 /* 000001001 - Two 32-bit edge boundary processing, no CC  */
 105 #define EDGE32N_OPF     0x009
 106
 107 /* 000001010 - Two 32-bit edge boundary processing, little-endian  */
 108 #define EDGE32L_OPF     0x00a
 109
 110 /* 000001011 - Two 32-bit edge boundary processing, little-endian, no CC  */
 111 #define EDGE32LN_OPF    0x00b
 112
 113 /* 000111110 - distance between 8 8-bit components  */
 114 #define PDIST_OPF       0x03e
 115
 116 /* 000010000 - convert 8-bit 3-D address to blocked byte address  */
 117 #define ARRAY8_OPF      0x010
 118
 119 /* 000010010 - convert 16-bit 3-D address to blocked byte address  */
 120 #define ARRAY16_OPF     0x012
 121
 122 /* 000010100 - convert 32-bit 3-D address to blocked byte address  */
 123 #define ARRAY32_OPF     0x014
 124
 125 /* 000011001 - Set the GSR.MASK field in preparation for a BSHUFFLE  */
 126 #define BMASK_OPF       0x019
 127
 128 /* 001001100 - Permute bytes as specified by GSR.MASK  */
 129 #define BSHUFFLE_OPF    0x04c
 130
 131 #define VIS_OPF_SHIFT   5
 132 #define VIS_OPF_MASK    (0x1ff << VIS_OPF_SHIFT)
 133
 134 #define RS1(INSN)       (((INSN) >> 14) & 0x1f)
 135 #define RS2(INSN)       (((INSN) >>  0) & 0x1f)
 136 #define RD(INSN)        (((INSN) >> 25) & 0x1f)
 137
 138 static inline void maybe_flush_windows(unsigned int rs1, unsigned int rs2,
 139                                        unsigned int rd, int from_kernel)
 140 {
 141         if (rs2 >= 16 || rs1 >= 16 || rd >= 16) {
 142                 if (from_kernel != 0)
 143                         __asm__ __volatile__("flushw");
 144                 else
 145                         flushw_user();
 146         }
 147 }
 148
 149 static unsigned long fetch_reg(unsigned int reg, struct pt_regs *regs)
 150 {
 151         unsigned long value;
 152
 153         if (reg < 16)
 154                 return (!reg ? 0 : regs->u_regs[reg]);
 155         if (regs->tstate & TSTATE_PRIV) {
 156                 struct reg_window *win;
 157                 win = (struct reg_window *)(regs->u_regs[UREG_FP] + STACK_BIAS);
 158                 value = win->locals[reg - 16];
 159         } else if (test_thread_flag(TIF_32BIT)) {
 160                 struct reg_window32 __user *win32;
 161                 win32 = (struct reg_window32 __user *)((unsigned long)((u32)regs->u_regs[UREG_FP]));
 162                 get_user(value, &win32->locals[reg - 16]);
 163         } else {
 164                 struct reg_window __user *win;
 165                 win = (struct reg_window __user *)(regs->u_regs[UREG_FP] + STACK_BIAS);
 166                 get_user(value, &win->locals[reg - 16]);
 167         }
 168         return value;
 169 }
 170
 171 static inline unsigned long __user *__fetch_reg_addr_user(unsigned int reg,
 172                                                           struct pt_regs *regs)
 173 {
 174         BUG_ON(reg < 16);
 175         BUG_ON(regs->tstate & TSTATE_PRIV);
 176
 177         if (test_thread_flag(TIF_32BIT)) {
 178                 struct reg_window32 __user *win32;
 179                 win32 = (struct reg_window32 __user *)((unsigned long)((u32)regs->u_regs[UREG_FP]));
 180                 return (unsigned long __user *)&win32->locals[reg - 16];
 181         } else {
 182                 struct reg_window __user *win;
 183                 win = (struct reg_window __user *)(regs->u_regs[UREG_FP] + STACK_BIAS);
 184                 return &win->locals[reg - 16];
 185         }
 186 }
 187
 188 static inline unsigned long *__fetch_reg_addr_kern(unsigned int reg,
 189                                                    struct pt_regs *regs)
 190 {
 191         BUG_ON(reg >= 16);
 192         BUG_ON(regs->tstate & TSTATE_PRIV);
 193
 194         return &regs->u_regs[reg];
 195 }
 196
 197 static void store_reg(struct pt_regs *regs, unsigned long val, unsigned long rd)
 198 {
 199         if (rd < 16) {
 200                 unsigned long *rd_kern = __fetch_reg_addr_kern(rd, regs);
 201
 202                 *rd_kern = val;
 203         } else {
 204                 unsigned long __user *rd_user = __fetch_reg_addr_user(rd, regs);
 205
 206                 if (test_thread_flag(TIF_32BIT))
 207                         __put_user((u32)val, (u32 __user *)rd_user);
 208                 else
 209                         __put_user(val, rd_user);
 210         }
 211 }
 212
 213 static inline unsigned long fpd_regval(struct fpustate *f,
 214                                        unsigned int insn_regnum)
 215 {
 216         insn_regnum = (((insn_regnum & 1) << 5) |
 217                        (insn_regnum & 0x1e));
 218
 219         return *(unsigned long *) &f->regs[insn_regnum];
 220 }
 221
 222 static inline unsigned long *fpd_regaddr(struct fpustate *f,
 223                                          unsigned int insn_regnum)
 224 {
 225         insn_regnum = (((insn_regnum & 1) << 5) |
 226                        (insn_regnum & 0x1e));
 227
 228         return (unsigned long *) &f->regs[insn_regnum];
 229 }
 230
 231 static inline unsigned int fps_regval(struct fpustate *f,
 232                                       unsigned int insn_regnum)
 233 {
 234         return f->regs[insn_regnum];
 235 }
 236
 237 static inline unsigned int *fps_regaddr(struct fpustate *f,
 238                                         unsigned int insn_regnum)
 239 {
 240         return &f->regs[insn_regnum];
 241 }
 242
 243 struct edge_tab {
 244         u16 left, right;
 245 };
 246 static struct edge_tab edge8_tab[8] = {
 247         { 0xff, 0x80 },
 248         { 0x7f, 0xc0 },
 249         { 0x3f, 0xe0 },
 250         { 0x1f, 0xf0 },
 251         { 0x0f, 0xf8 },
 252         { 0x07, 0xfc },
 253         { 0x03, 0xfe },
 254         { 0x01, 0xff },
 255 };
 256 static struct edge_tab edge8_tab_l[8] = {
 257         { 0xff, 0x01 },
 258         { 0xfe, 0x03 },
 259         { 0xfc, 0x07 },
 260         { 0xf8, 0x0f },
 261         { 0xf0, 0x1f },
 262         { 0xe0, 0x3f },
 263         { 0xc0, 0x7f },
 264         { 0x80, 0xff },
 265 };
 266 static struct edge_tab edge16_tab[4] = {
 267         { 0xf, 0x8 },
 268         { 0x7, 0xc },
 269         { 0x3, 0xe },
 270         { 0x1, 0xf },
 271 };
 272 static struct edge_tab edge16_tab_l[4] = {
 273         { 0xf, 0x1 },
 274         { 0xe, 0x3 },
 275         { 0xc, 0x7 },
 276         { 0x8, 0xf },
 277 };
 278 static struct edge_tab edge32_tab[2] = {
 279         { 0x3, 0x2 },
 280         { 0x1, 0x3 },
 281 };
 282 static struct edge_tab edge32_tab_l[2] = {
 283         { 0x3, 0x1 },
 284         { 0x2, 0x3 },
 285 };
 286
 287 static void edge(struct pt_regs *regs, unsigned int insn, unsigned int opf)
 288 {
 289         unsigned long orig_rs1, rs1, orig_rs2, rs2, rd_val;
 290         u16 left, right;
 291
 292         maybe_flush_windows(RS1(insn), RS2(insn), RD(insn), 0);
 293         orig_rs1 = rs1 = fetch_reg(RS1(insn), regs);
 294         orig_rs2 = rs2 = fetch_reg(RS2(insn), regs);
 295
 296         if (test_thread_flag(TIF_32BIT)) {
 297                 rs1 = rs1 & 0xffffffff;
 298                 rs2 = rs2 & 0xffffffff;
 299         }
 300         switch (opf) {
 301         default:
 302         case EDGE8_OPF:
 303         case EDGE8N_OPF:
 304                 left = edge8_tab[rs1 & 0x7].left;
 305                 right = edge8_tab[rs2 & 0x7].right;
 306                 break;
 307         case EDGE8L_OPF:
 308         case EDGE8LN_OPF:
 309                 left = edge8_tab_l[rs1 & 0x7].left;
 310                 right = edge8_tab_l[rs2 & 0x7].right;
 311                 break;
 312
 313         case EDGE16_OPF:
 314         case EDGE16N_OPF:
 315                 left = edge16_tab[(rs1 >> 1) & 0x3].left;
 316                 right = edge16_tab[(rs2 >> 1) & 0x3].right;
 317                 break;
 318
 319         case EDGE16L_OPF:
 320         case EDGE16LN_OPF:
 321                 left = edge16_tab_l[(rs1 >> 1) & 0x3].left;
 322                 right = edge16_tab_l[(rs2 >> 1) & 0x3].right;
 323                 break;
 324
 325         case EDGE32_OPF:
 326         case EDGE32N_OPF:
 327                 left = edge32_tab[(rs1 >> 2) & 0x1].left;
 328                 right = edge32_tab[(rs2 >> 2) & 0x1].right;
 329                 break;
 330
 331         case EDGE32L_OPF:
 332         case EDGE32LN_OPF:
 333                 left = edge32_tab_l[(rs1 >> 2) & 0x1].left;
 334                 right = edge32_tab_l[(rs2 >> 2) & 0x1].right;
 335                 break;
 336         };
 337
 338         if ((rs1 & ~0x7UL) == (rs2 & ~0x7UL))
 339                 rd_val = right & left;
 340         else
 341                 rd_val = left;
 342
 343         store_reg(regs, rd_val, RD(insn));
 344
 345         switch (opf) {
 346         case EDGE8_OPF:
 347         case EDGE8L_OPF:
 348         case EDGE16_OPF:
 349         case EDGE16L_OPF:
 350         case EDGE32_OPF:
 351         case EDGE32L_OPF: {
 352                 unsigned long ccr, tstate;
 353
 354                 __asm__ __volatile__("subcc     %1, %2, %%g0\n\t"
 355                                      "rd        %%ccr, %0"
 356                                      : "=r" (ccr)
 357                                      : "r" (orig_rs1), "r" (orig_rs2)
 358                                      : "cc");
 359                 tstate = regs->tstate & ~(TSTATE_XCC | TSTATE_ICC);
 360                 regs->tstate = tstate | (ccr << 32UL);
 361         }
 362         };
 363 }
 364
 365 static void array(struct pt_regs *regs, unsigned int insn, unsigned int opf)
 366 {
 367         unsigned long rs1, rs2, rd_val;
 368         unsigned int bits, bits_mask;
 369
 370         maybe_flush_windows(RS1(insn), RS2(insn), RD(insn), 0);
 371         rs1 = fetch_reg(RS1(insn), regs);
 372         rs2 = fetch_reg(RS2(insn), regs);
 373
 374         bits = (rs2 > 5 ? 5 : rs2);
 375         bits_mask = (1UL << bits) - 1UL;
 376
 377         rd_val = ((((rs1 >> 11) & 0x3) <<  0) |
 378                   (((rs1 >> 33) & 0x3) <<  2) |
 379                   (((rs1 >> 55) & 0x1) <<  4) |
 380                   (((rs1 >> 13) & 0xf) <<  5) |
 381                   (((rs1 >> 35) & 0xf) <<  9) |
 382                   (((rs1 >> 56) & 0xf) << 13) |
 383                   (((rs1 >> 17) & bits_mask) << 17) |
 384                   (((rs1 >> 39) & bits_mask) << (17 + bits)) |
 385                   (((rs1 >> 60) & 0xf)       << (17 + (2*bits))));
 386
 387         switch (opf) {
 388         case ARRAY16_OPF:
 389                 rd_val <<= 1;
 390                 break;
 391
 392         case ARRAY32_OPF:
 393                 rd_val <<= 2;
 394         };
 395
 396         store_reg(regs, rd_val, RD(insn));
 397 }
 398
 399 static void bmask(struct pt_regs *regs, unsigned int insn)
 400 {
 401         unsigned long rs1, rs2, rd_val, gsr;
 402
 403         maybe_flush_windows(RS1(insn), RS2(insn), RD(insn), 0);
 404         rs1 = fetch_reg(RS1(insn), regs);
 405         rs2 = fetch_reg(RS2(insn), regs);
 406         rd_val = rs1 + rs2;
 407
 408         store_reg(regs, rd_val, RD(insn));
 409
 410         gsr = current_thread_info()->gsr[0] & 0xffffffff;
 411         gsr |= rd_val << 32UL;
 412         current_thread_info()->gsr[0] = gsr;
 413 }
 414
 415 static void bshuffle(struct pt_regs *regs, unsigned int insn)
 416 {
 417         struct fpustate *f = FPUSTATE;
 418         unsigned long rs1, rs2, rd_val;
 419         unsigned long bmask, i;
 420
 421         bmask = current_thread_info()->gsr[0] >> 32UL;
 422
 423         rs1 = fpd_regval(f, RS1(insn));
 424         rs2 = fpd_regval(f, RS2(insn));
 425
 426         rd_val = 0UL;
 427         for (i = 0; i < 8; i++) {
 428                 unsigned long which = (bmask >> (i * 4)) & 0xf;
 429                 unsigned long byte;
 430
 431                 if (which < 8)
 432                         byte = (rs1 >> (which * 8)) & 0xff;
 433                 else
 434                         byte = (rs2 >> ((which-8)*8)) & 0xff;
 435                 rd_val |= (byte << (i * 8));
 436         }
 437
 438         *fpd_regaddr(f, RD(insn)) = rd_val;
 439 }
 440
 441 static void pdist(struct pt_regs *regs, unsigned int insn)
 442 {
 443         struct fpustate *f = FPUSTATE;
 444         unsigned long rs1, rs2, *rd, rd_val;
 445         unsigned long i;
 446
 447         rs1 = fpd_regval(f, RS1(insn));
 448         rs2 = fpd_regval(f, RS2(insn));
 449         rd = fpd_regaddr(f, RD(insn));
 450
 451         rd_val = *rd;
 452
 453         for (i = 0; i < 8; i++) {
 454                 s16 s1, s2;
 455
 456                 s1 = (rs1 >> (56 - (i * 8))) & 0xff;
 457                 s2 = (rs2 >> (56 - (i * 8))) & 0xff;
 458
 459                 /* Absolute value of difference. */
 460                 s1 -= s2;
 461                 if (s1 < 0)
 462                         s1 = ~s1 + 1;
 463
 464                 rd_val += s1;
 465         }
 466
 467         *rd = rd_val;
 468 }
 469
 470 static void pformat(struct pt_regs *regs, unsigned int insn, unsigned int opf)
 471 {
 472         struct fpustate *f = FPUSTATE;
 473         unsigned long rs1, rs2, gsr, scale, rd_val;
 474
 475         gsr = current_thread_info()->gsr[0];
 476         scale = (gsr >> 3) & (opf == FPACK16_OPF ? 0xf : 0x1f);
 477         switch (opf) {
 478         case FPACK16_OPF: {
 479                 unsigned long byte;
 480
 481                 rs2 = fpd_regval(f, RS2(insn));
 482                 rd_val = 0;
 483                 for (byte = 0; byte < 4; byte++) {
 484                         unsigned int val;
 485                         s16 src = (rs2 >> (byte * 16UL)) & 0xffffUL;
 486                         int scaled = src << scale;
 487                         int from_fixed = scaled >> 7;
 488
 489                         val = ((from_fixed < 0) ?
 490                                0 :
 491                                (from_fixed > 255) ?
 492                                255 : from_fixed);
 493
 494                         rd_val |= (val << (8 * byte));
 495                 }
 496                 *fps_regaddr(f, RD(insn)) = rd_val;
 497                 break;
 498         }
 499
 500         case FPACK32_OPF: {
 501                 unsigned long word;
 502
 503                 rs1 = fpd_regval(f, RS1(insn));
 504                 rs2 = fpd_regval(f, RS2(insn));
 505                 rd_val = (rs1 << 8) & ~(0x000000ff000000ffUL);
 506                 for (word = 0; word < 2; word++) {
 507                         unsigned long val;
 508                         s32 src = (rs2 >> (word * 32UL));
 509                         s64 scaled = src << scale;
 510                         s64 from_fixed = scaled >> 23;
 511
 512                         val = ((from_fixed < 0) ?
 513                                0 :
 514                                (from_fixed > 255) ?
 515                                255 : from_fixed);
 516
 517                         rd_val |= (val << (32 * word));
 518                 }
 519                 *fpd_regaddr(f, RD(insn)) = rd_val;
 520                 break;
 521         }
 522
 523         case FPACKFIX_OPF: {
 524                 unsigned long word;
 525
 526                 rs2 = fpd_regval(f, RS2(insn));
 527
 528                 rd_val = 0;
 529                 for (word = 0; word < 2; word++) {
 530                         long val;
 531                         s32 src = (rs2 >> (word * 32UL));
 532                         s64 scaled = src << scale;
 533                         s64 from_fixed = scaled >> 16;
 534
 535                         val = ((from_fixed < -32768) ?
 536                                -32768 :
 537                                (from_fixed > 32767) ?
 538                                32767 : from_fixed);
 539
 540                         rd_val |= ((val & 0xffff) << (word * 16));
 541                 }
 542                 *fps_regaddr(f, RD(insn)) = rd_val;
 543                 break;
 544         }
 545
 546         case FEXPAND_OPF: {
 547                 unsigned long byte;
 548
 549                 rs2 = fps_regval(f, RS2(insn));
 550
 551                 rd_val = 0;
 552                 for (byte = 0; byte < 4; byte++) {
 553                         unsigned long val;
 554                         u8 src = (rs2 >> (byte * 8)) & 0xff;
 555
 556                         val = src << 4;
 557
 558                         rd_val |= (val << (byte * 16));
 559                 }
 560                 *fpd_regaddr(f, RD(insn)) = rd_val;
 561                 break;
 562         }
 563
 564         case FPMERGE_OPF: {
 565                 rs1 = fps_regval(f, RS1(insn));
 566                 rs2 = fps_regval(f, RS2(insn));
 567
 568                 rd_val = (((rs2 & 0x000000ff) <<  0) |
 569                           ((rs1 & 0x000000ff) <<  8) |
 570                           ((rs2 & 0x0000ff00) <<  8) |
 571                           ((rs1 & 0x0000ff00) << 16) |
 572                           ((rs2 & 0x00ff0000) << 16) |
 573                           ((rs1 & 0x00ff0000) << 24) |
 574                           ((rs2 & 0xff000000) << 24) |
 575                           ((rs1 & 0xff000000) << 32));
 576                 *fpd_regaddr(f, RD(insn)) = rd_val;
 577                 break;
 578         }
 579         };
 580 }
 581
 582 static void pmul(struct pt_regs *regs, unsigned int insn, unsigned int opf)
 583 {
 584         struct fpustate *f = FPUSTATE;
 585         unsigned long rs1, rs2, rd_val;
 586
 587         switch (opf) {
 588         case FMUL8x16_OPF: {
 589                 unsigned long byte;
 590
 591                 rs1 = fps_regval(f, RS1(insn));
 592                 rs2 = fpd_regval(f, RS2(insn));
 593
 594                 rd_val = 0;
 595                 for (byte = 0; byte < 4; byte++) {
 596                         u16 src1 = (rs1 >> (byte *  8)) & 0x00ff;
 597                         s16 src2 = (rs2 >> (byte * 16)) & 0xffff;
 598                         u32 prod = src1 * src2;
 599                         u16 scaled = ((prod & 0x00ffff00) >> 8);
 600
 601                         /* Round up.  */
 602                         if (prod & 0x80)
 603                                 scaled++;
 604                         rd_val |= ((scaled & 0xffffUL) << (byte * 16UL));
 605                 }
 606
 607                 *fpd_regaddr(f, RD(insn)) = rd_val;
 608                 break;
 609         }
 610
 611         case FMUL8x16AU_OPF:
 612         case FMUL8x16AL_OPF: {
 613                 unsigned long byte;
 614                 s16 src2;
 615
 616                 rs1 = fps_regval(f, RS1(insn));
 617                 rs2 = fps_regval(f, RS2(insn));
 618
 619                 rd_val = 0;
 620                 src2 = (rs2 >> (opf == FMUL8x16AU_OPF) ? 16 : 0);
 621                 for (byte = 0; byte < 4; byte++) {
 622                         u16 src1 = (rs1 >> (byte * 8)) & 0x00ff;
 623                         u32 prod = src1 * src2;
 624                         u16 scaled = ((prod & 0x00ffff00) >> 8);
 625
 626                         /* Round up.  */
 627                         if (prod & 0x80)
 628                                 scaled++;
 629                         rd_val |= ((scaled & 0xffffUL) << (byte * 16UL));
 630                 }
 631
 632                 *fpd_regaddr(f, RD(insn)) = rd_val;
 633                 break;
 634         }
 635
 636         case FMUL8SUx16_OPF:
 637         case FMUL8ULx16_OPF: {
 638                 unsigned long byte, ushift;
 639
 640                 rs1 = fpd_regval(f, RS1(insn));
 641                 rs2 = fpd_regval(f, RS2(insn));
 642
 643                 rd_val = 0;
 644                 ushift = (opf == FMUL8SUx16_OPF) ? 8 : 0;
 645                 for (byte = 0; byte < 4; byte++) {
 646                         u16 src1;
 647                         s16 src2;
 648                         u32 prod;
 649                         u16 scaled;
 650
 651                         src1 = ((rs1 >> ((16 * byte) + ushift)) & 0x00ff);
 652                         src2 = ((rs2 >> (16 * byte)) & 0xffff);
 653                         prod = src1 * src2;
 654                         scaled = ((prod & 0x00ffff00) >> 8);
 655
 656                         /* Round up.  */
 657                         if (prod & 0x80)
 658                                 scaled++;
 659                         rd_val |= ((scaled & 0xffffUL) << (byte * 16UL));
 660                 }
 661
 662                 *fpd_regaddr(f, RD(insn)) = rd_val;
 663                 break;
 664         }
 665
 666         case FMULD8SUx16_OPF:
 667         case FMULD8ULx16_OPF: {
 668                 unsigned long byte, ushift;
 669
 670                 rs1 = fps_regval(f, RS1(insn));
 671                 rs2 = fps_regval(f, RS2(insn));
 672
 673                 rd_val = 0;
 674                 ushift = (opf == FMULD8SUx16_OPF) ? 8 : 0;
 675                 for (byte = 0; byte < 2; byte++) {
 676                         u16 src1;
 677                         s16 src2;
 678                         u32 prod;
 679                         u16 scaled;
 680
 681                         src1 = ((rs1 >> ((16 * byte) + ushift)) & 0x00ff);
 682                         src2 = ((rs2 >> (16 * byte)) & 0xffff);
 683                         prod = src1 * src2;
 684                         scaled = ((prod & 0x00ffff00) >> 8);
 685
 686                         /* Round up.  */
 687                         if (prod & 0x80)
 688                                 scaled++;
 689                         rd_val |= ((scaled & 0xffffUL) <<
 690                                    ((byte * 32UL) + 7UL));
 691                 }
 692                 *fpd_regaddr(f, RD(insn)) = rd_val;
 693                 break;
 694         }
 695         };
 696 }
 697
 698 static void pcmp(struct pt_regs *regs, unsigned int insn, unsigned int opf)
 699 {
 700         struct fpustate *f = FPUSTATE;
 701         unsigned long rs1, rs2, rd_val, i;
 702
 703         rs1 = fpd_regval(f, RS1(insn));
 704         rs2 = fpd_regval(f, RS2(insn));
 705
 706         rd_val = 0;
 707
 708         switch (opf) {
 709         case FCMPGT16_OPF:
 710                 for (i = 0; i < 4; i++) {
 711                         s16 a = (rs1 >> (i * 16)) & 0xffff;
 712                         s16 b = (rs2 >> (i * 16)) & 0xffff;
 713
 714                         if (a > b)
 715                                 rd_val |= 1 << i;
 716                 }
 717                 break;
 718
 719         case FCMPGT32_OPF:
 720                 for (i = 0; i < 2; i++) {
 721                         s32 a = (rs1 >> (i * 32)) & 0xffff;
 722                         s32 b = (rs2 >> (i * 32)) & 0xffff;
 723
 724                         if (a > b)
 725                                 rd_val |= 1 << i;
 726                 }
 727                 break;
 728
 729         case FCMPLE16_OPF:
 730                 for (i = 0; i < 4; i++) {
 731                         s16 a = (rs1 >> (i * 16)) & 0xffff;
 732                         s16 b = (rs2 >> (i * 16)) & 0xffff;
 733
 734                         if (a <= b)
 735                                 rd_val |= 1 << i;
 736                 }
 737                 break;
 738
 739         case FCMPLE32_OPF:
 740                 for (i = 0; i < 2; i++) {
 741                         s32 a = (rs1 >> (i * 32)) & 0xffff;
 742                         s32 b = (rs2 >> (i * 32)) & 0xffff;
 743
 744                         if (a <= b)
 745                                 rd_val |= 1 << i;
 746                 }
 747                 break;
 748
 749         case FCMPNE16_OPF:
 750                 for (i = 0; i < 4; i++) {
 751                         s16 a = (rs1 >> (i * 16)) & 0xffff;
 752                         s16 b = (rs2 >> (i * 16)) & 0xffff;
 753
 754                         if (a != b)
 755                                 rd_val |= 1 << i;
 756                 }
 757                 break;
 758
 759         case FCMPNE32_OPF:
 760                 for (i = 0; i < 2; i++) {
 761                         s32 a = (rs1 >> (i * 32)) & 0xffff;
 762                         s32 b = (rs2 >> (i * 32)) & 0xffff;
 763
 764                         if (a != b)
 765                                 rd_val |= 1 << i;
 766                 }
 767                 break;
 768
 769         case FCMPEQ16_OPF:
 770                 for (i = 0; i < 4; i++) {
 771                         s16 a = (rs1 >> (i * 16)) & 0xffff;
 772                         s16 b = (rs2 >> (i * 16)) & 0xffff;
 773
 774                         if (a == b)
 775                                 rd_val |= 1 << i;
 776                 }
 777                 break;
 778
 779         case FCMPEQ32_OPF:
 780                 for (i = 0; i < 2; i++) {
 781                         s32 a = (rs1 >> (i * 32)) & 0xffff;
 782                         s32 b = (rs2 >> (i * 32)) & 0xffff;
 783
 784                         if (a == b)
 785                                 rd_val |= 1 << i;
 786                 }
 787                 break;
 788         };
 789
 790         maybe_flush_windows(0, 0, RD(insn), 0);
 791         store_reg(regs, rd_val, RD(insn));
 792 }
 793
 794 /* Emulate the VIS instructions which are not implemented in
 795  * hardware on Niagara.
 796  */
 797 int vis_emul(struct pt_regs *regs, unsigned int insn)
 798 {
 799         unsigned long pc = regs->tpc;
 800         unsigned int opf;
 801
 802         BUG_ON(regs->tstate & TSTATE_PRIV);
 803
 804         if (test_thread_flag(TIF_32BIT))
 805                 pc = (u32)pc;
 806
 807         if (get_user(insn, (u32 __user *) pc))
 808                 return -EFAULT;
 809
 810         save_and_clear_fpu();
 811
 812         opf = (insn & VIS_OPF_MASK) >> VIS_OPF_SHIFT;
 813         switch (opf) {
 814         default:
 815                 return -EINVAL;
 816
 817         /* Pixel Formatting Instructions.  */
 818         case FPACK16_OPF:
 819         case FPACK32_OPF:
 820         case FPACKFIX_OPF:
 821         case FEXPAND_OPF:
 822         case FPMERGE_OPF:
 823                 pformat(regs, insn, opf);
 824                 break;
 825
 826         /* Partitioned Multiply Instructions  */
 827         case FMUL8x16_OPF:
 828         case FMUL8x16AU_OPF:
 829         case FMUL8x16AL_OPF:
 830         case FMUL8SUx16_OPF:
 831         case FMUL8ULx16_OPF:
 832         case FMULD8SUx16_OPF:
 833         case FMULD8ULx16_OPF:
 834                 pmul(regs, insn, opf);
 835                 break;
 836
 837         /* Pixel Compare Instructions  */
 838         case FCMPGT16_OPF:
 839         case FCMPGT32_OPF:
 840         case FCMPLE16_OPF:
 841         case FCMPLE32_OPF:
 842         case FCMPNE16_OPF:
 843         case FCMPNE32_OPF:
 844         case FCMPEQ16_OPF:
 845         case FCMPEQ32_OPF:
 846                 pcmp(regs, insn, opf);
 847                 break;
 848
 849         /* Edge Handling Instructions  */
 850         case EDGE8_OPF:
 851         case EDGE8N_OPF:
 852         case EDGE8L_OPF:
 853         case EDGE8LN_OPF:
 854         case EDGE16_OPF:
 855         case EDGE16N_OPF:
 856         case EDGE16L_OPF:
 857         case EDGE16LN_OPF:
 858         case EDGE32_OPF:
 859         case EDGE32N_OPF:
 860         case EDGE32L_OPF:
 861         case EDGE32LN_OPF:
 862                 edge(regs, insn, opf);
 863                 break;
 864
 865         /* Pixel Component Distance  */
 866         case PDIST_OPF:
 867                 pdist(regs, insn);
 868                 break;
 869
 870         /* Three-Dimensional Array Addressing Instructions  */
 871         case ARRAY8_OPF:
 872         case ARRAY16_OPF:
 873         case ARRAY32_OPF:
 874                 array(regs, insn, opf);
 875                 break;
 876
 877         /* Byte Mask and Shuffle Instructions  */
 878         case BMASK_OPF:
 879                 bmask(regs, insn);
 880                 break;
 881
 882         case BSHUFFLE_OPF:
 883                 bshuffle(regs, insn);
 884                 break;
 885         };
 886
 887         regs->tpc = regs->tnpc;
 888         regs->tnpc += 4;
 889         return 0;
 890 }