arch/sparc64/kernel/unaligned.c

   1 /* $Id: unaligned.c,v 1.24 2002/02/09 19:49:31 davem Exp $
   2  * unaligned.c: Unaligned load/store trap handling with special
   3  *              cases for the kernel to do them more quickly.
   4  *
   5  * Copyright (C) 1996 David S. Miller (davem@caip.rutgers.edu)
   6  * Copyright (C) 1996,1997 Jakub Jelinek (jj@sunsite.mff.cuni.cz)
   7  */
   8
   9
  10 <<<<<<< HEAD:arch/sparc64/kernel/unaligned.c
  11 =======
  12 #include <linux/jiffies.h>
  13 >>>>>>> 264e3e889d86e552b4191d69bb60f4f3b383135a:arch/sparc64/kernel/unaligned.c
  14 #include <linux/kernel.h>
  15 #include <linux/sched.h>
  16 #include <linux/mm.h>
  17 #include <linux/module.h>
  18 #include <asm/asi.h>
  19 #include <asm/ptrace.h>
  20 #include <asm/pstate.h>
  21 #include <asm/processor.h>
  22 #include <asm/system.h>
  23 #include <asm/uaccess.h>
  24 #include <linux/smp.h>
  25 #include <linux/bitops.h>
  26 #include <linux/kallsyms.h>
  27 #include <asm/fpumacro.h>
  28
  29 /* #define DEBUG_MNA */
  30
  31 enum direction {
  32         load,    /* ld, ldd, ldh, ldsh */
  33         store,   /* st, std, sth, stsh */
  34         both,    /* Swap, ldstub, cas, ... */
  35         fpld,
  36         fpst,
  37         invalid,
  38 };
  39
  40 #ifdef DEBUG_MNA
  41 static char *dirstrings[] = {
  42   "load", "store", "both", "fpload", "fpstore", "invalid"
  43 };
  44 #endif
  45
  46 static inline enum direction decode_direction(unsigned int insn)
  47 {
  48         unsigned long tmp = (insn >> 21) & 1;
  49
  50         if (!tmp)
  51                 return load;
  52         else {
  53                 switch ((insn>>19)&0xf) {
  54                 case 15: /* swap* */
  55                         return both;
  56                 default:
  57                         return store;
  58                 }
  59         }
  60 }
  61
  62 /* 16 = double-word, 8 = extra-word, 4 = word, 2 = half-word */
  63 static inline int decode_access_size(unsigned int insn)
  64 {
  65         unsigned int tmp;
  66
  67         tmp = ((insn >> 19) & 0xf);
  68         if (tmp == 11 || tmp == 14) /* ldx/stx */
  69                 return 8;
  70         tmp &= 3;
  71         if (!tmp)
  72                 return 4;
  73         else if (tmp == 3)
  74                 return 16;      /* ldd/std - Although it is actually 8 */
  75         else if (tmp == 2)
  76                 return 2;
  77         else {
  78                 printk("Impossible unaligned trap. insn=%08x\n", insn);
  79                 die_if_kernel("Byte sized unaligned access?!?!", current_thread_info()->kregs);
  80
  81                 /* GCC should never warn that control reaches the end
  82                  * of this function without returning a value because
  83                  * die_if_kernel() is marked with attribute 'noreturn'.
  84                  * Alas, some versions do...
  85                  */
  86
  87                 return 0;
  88         }
  89 }
  90
  91 static inline int decode_asi(unsigned int insn, struct pt_regs *regs)
  92 {
  93         if (insn & 0x800000) {
  94                 if (insn & 0x2000)
  95                         return (unsigned char)(regs->tstate >> 24);     /* %asi */
  96                 else
  97                         return (unsigned char)(insn >> 5);              /* imm_asi */
  98         } else
  99                 return ASI_P;
 100 }
 101
 102 /* 0x400000 = signed, 0 = unsigned */
 103 static inline int decode_signedness(unsigned int insn)
 104 {
 105         return (insn & 0x400000);
 106 }
 107
 108 static inline void maybe_flush_windows(unsigned int rs1, unsigned int rs2,
 109                                        unsigned int rd, int from_kernel)
 110 {
 111         if (rs2 >= 16 || rs1 >= 16 || rd >= 16) {
 112                 if (from_kernel != 0)
 113                         __asm__ __volatile__("flushw");
 114                 else
 115                         flushw_user();
 116         }
 117 }
 118
 119 static inline long sign_extend_imm13(long imm)
 120 {
 121         return imm << 51 >> 51;
 122 }
 123
 124 static unsigned long fetch_reg(unsigned int reg, struct pt_regs *regs)
 125 {
 126         unsigned long value;
 127
 128         if (reg < 16)
 129                 return (!reg ? 0 : regs->u_regs[reg]);
 130         if (regs->tstate & TSTATE_PRIV) {
 131                 struct reg_window *win;
 132                 win = (struct reg_window *)(regs->u_regs[UREG_FP] + STACK_BIAS);
 133                 value = win->locals[reg - 16];
 134         } else if (test_thread_flag(TIF_32BIT)) {
 135                 struct reg_window32 __user *win32;
 136                 win32 = (struct reg_window32 __user *)((unsigned long)((u32)regs->u_regs[UREG_FP]));
 137                 get_user(value, &win32->locals[reg - 16]);
 138         } else {
 139                 struct reg_window __user *win;
 140                 win = (struct reg_window __user *)(regs->u_regs[UREG_FP] + STACK_BIAS);
 141                 get_user(value, &win->locals[reg - 16]);
 142         }
 143         return value;
 144 }
 145
 146 static unsigned long *fetch_reg_addr(unsigned int reg, struct pt_regs *regs)
 147 {
 148         if (reg < 16)
 149                 return &regs->u_regs[reg];
 150         if (regs->tstate & TSTATE_PRIV) {
 151                 struct reg_window *win;
 152                 win = (struct reg_window *)(regs->u_regs[UREG_FP] + STACK_BIAS);
 153                 return &win->locals[reg - 16];
 154         } else if (test_thread_flag(TIF_32BIT)) {
 155                 struct reg_window32 *win32;
 156                 win32 = (struct reg_window32 *)((unsigned long)((u32)regs->u_regs[UREG_FP]));
 157                 return (unsigned long *)&win32->locals[reg - 16];
 158         } else {
 159                 struct reg_window *win;
 160                 win = (struct reg_window *)(regs->u_regs[UREG_FP] + STACK_BIAS);
 161                 return &win->locals[reg - 16];
 162         }
 163 }
 164
 165 unsigned long compute_effective_address(struct pt_regs *regs,
 166                                         unsigned int insn, unsigned int rd)
 167 {
 168         unsigned int rs1 = (insn >> 14) & 0x1f;
 169         unsigned int rs2 = insn & 0x1f;
 170         int from_kernel = (regs->tstate & TSTATE_PRIV) != 0;
 171
 172         if (insn & 0x2000) {
 173                 maybe_flush_windows(rs1, 0, rd, from_kernel);
 174                 return (fetch_reg(rs1, regs) + sign_extend_imm13(insn));
 175         } else {
 176                 maybe_flush_windows(rs1, rs2, rd, from_kernel);
 177                 return (fetch_reg(rs1, regs) + fetch_reg(rs2, regs));
 178         }
 179 }
 180
 181 /* This is just to make gcc think die_if_kernel does return... */
 182 static void __used unaligned_panic(char *str, struct pt_regs *regs)
 183 {
 184         die_if_kernel(str, regs);
 185 }
 186
 187 extern int do_int_load(unsigned long *dest_reg, int size,
 188                        unsigned long *saddr, int is_signed, int asi);
 189
 190 extern int __do_int_store(unsigned long *dst_addr, int size,
 191                           unsigned long src_val, int asi);
 192
 193 static inline int do_int_store(int reg_num, int size, unsigned long *dst_addr,
 194                                struct pt_regs *regs, int asi, int orig_asi)
 195 {
 196         unsigned long zero = 0;
 197         unsigned long *src_val_p = &zero;
 198         unsigned long src_val;
 199
 200         if (size == 16) {
 201                 size = 8;
 202                 zero = (((long)(reg_num ?
 203                         (unsigned)fetch_reg(reg_num, regs) : 0)) << 32) |
 204                         (unsigned)fetch_reg(reg_num + 1, regs);
 205         } else if (reg_num) {
 206                 src_val_p = fetch_reg_addr(reg_num, regs);
 207         }
 208         src_val = *src_val_p;
 209         if (unlikely(asi != orig_asi)) {
 210                 switch (size) {
 211                 case 2:
 212                         src_val = swab16(src_val);
 213                         break;
 214                 case 4:
 215                         src_val = swab32(src_val);
 216                         break;
 217                 case 8:
 218                         src_val = swab64(src_val);
 219                         break;
 220                 case 16:
 221                 default:
 222                         BUG();
 223                         break;
 224                 };
 225         }
 226         return __do_int_store(dst_addr, size, src_val, asi);
 227 }
 228
 229 static inline void advance(struct pt_regs *regs)
 230 {
 231         regs->tpc   = regs->tnpc;
 232         regs->tnpc += 4;
 233         if (test_thread_flag(TIF_32BIT)) {
 234                 regs->tpc &= 0xffffffff;
 235                 regs->tnpc &= 0xffffffff;
 236         }
 237 }
 238
 239 static inline int floating_point_load_or_store_p(unsigned int insn)
 240 {
 241         return (insn >> 24) & 1;
 242 }
 243
 244 static inline int ok_for_kernel(unsigned int insn)
 245 {
 246         return !floating_point_load_or_store_p(insn);
 247 }
 248
 249 static void kernel_mna_trap_fault(int fixup_tstate_asi)
 250 {
 251         struct pt_regs *regs = current_thread_info()->kern_una_regs;
 252         unsigned int insn = current_thread_info()->kern_una_insn;
 253         const struct exception_table_entry *entry;
 254
 255         entry = search_exception_tables(regs->tpc);
 256         if (!entry) {
 257                 unsigned long address;
 258
 259                 address = compute_effective_address(regs, insn,
 260                                                     ((insn >> 25) & 0x1f));
 261                 if (address < PAGE_SIZE) {
 262                         printk(KERN_ALERT "Unable to handle kernel NULL "
 263                                "pointer dereference in mna handler");
 264                 } else
 265                         printk(KERN_ALERT "Unable to handle kernel paging "
 266                                "request in mna handler");
 267                 printk(KERN_ALERT " at virtual address %016lx\n",address);
 268                 printk(KERN_ALERT "current->{active_,}mm->context = %016lx\n",
 269                         (current->mm ? CTX_HWBITS(current->mm->context) :
 270                         CTX_HWBITS(current->active_mm->context)));
 271                 printk(KERN_ALERT "current->{active_,}mm->pgd = %016lx\n",
 272                         (current->mm ? (unsigned long) current->mm->pgd :
 273                         (unsigned long) current->active_mm->pgd));
 274                 die_if_kernel("Oops", regs);
 275                 /* Not reached */
 276         }
 277         regs->tpc = entry->fixup;
 278         regs->tnpc = regs->tpc + 4;
 279
 280         if (fixup_tstate_asi) {
 281                 regs->tstate &= ~TSTATE_ASI;
 282                 regs->tstate |= (ASI_AIUS << 24UL);
 283         }
 284 }
 285
 286 static void log_unaligned(struct pt_regs *regs)
 287 {
 288         static unsigned long count, last_time;
 289
 290 <<<<<<< HEAD:arch/sparc64/kernel/unaligned.c
 291         if (jiffies - last_time > 5 * HZ)
 292 =======
 293         if (time_after(jiffies, last_time + 5 * HZ))
 294 >>>>>>> 264e3e889d86e552b4191d69bb60f4f3b383135a:arch/sparc64/kernel/unaligned.c
 295                 count = 0;
 296         if (count < 5) {
 297                 last_time = jiffies;
 298                 count++;
 299                 printk("Kernel unaligned access at TPC[%lx] ", regs->tpc);
 300                 print_symbol("%s\n", regs->tpc);
 301         }
 302 }
 303
 304 asmlinkage void kernel_unaligned_trap(struct pt_regs *regs, unsigned int insn)
 305 {
 306         enum direction dir = decode_direction(insn);
 307         int size = decode_access_size(insn);
 308         int orig_asi, asi;
 309
 310         current_thread_info()->kern_una_regs = regs;
 311         current_thread_info()->kern_una_insn = insn;
 312
 313         orig_asi = asi = decode_asi(insn, regs);
 314
 315         /* If this is a {get,put}_user() on an unaligned userspace pointer,
 316          * just signal a fault and do not log the event.
 317          */
 318         if (asi == ASI_AIUS) {
 319                 kernel_mna_trap_fault(0);
 320                 return;
 321         }
 322
 323         log_unaligned(regs);
 324
 325         if (!ok_for_kernel(insn) || dir == both) {
 326                 printk("Unsupported unaligned load/store trap for kernel "
 327                        "at <%016lx>.\n", regs->tpc);
 328                 unaligned_panic("Kernel does fpu/atomic "
 329                                 "unaligned load/store.", regs);
 330
 331                 kernel_mna_trap_fault(0);
 332         } else {
 333                 unsigned long addr, *reg_addr;
 334                 int err;
 335
 336                 addr = compute_effective_address(regs, insn,
 337                                                  ((insn >> 25) & 0x1f));
 338 #ifdef DEBUG_MNA
 339                 printk("KMNA: pc=%016lx [dir=%s addr=%016lx size=%d] "
 340                        "retpc[%016lx]\n",
 341                        regs->tpc, dirstrings[dir], addr, size,
 342                        regs->u_regs[UREG_RETPC]);
 343 #endif
 344                 switch (asi) {
 345                 case ASI_NL:
 346                 case ASI_AIUPL:
 347                 case ASI_AIUSL:
 348                 case ASI_PL:
 349                 case ASI_SL:
 350                 case ASI_PNFL:
 351                 case ASI_SNFL:
 352                         asi &= ~0x08;
 353                         break;
 354                 };
 355                 switch (dir) {
 356                 case load:
 357                         reg_addr = fetch_reg_addr(((insn>>25)&0x1f), regs);
 358                         err = do_int_load(reg_addr, size,
 359                                           (unsigned long *) addr,
 360                                           decode_signedness(insn), asi);
 361                         if (likely(!err) && unlikely(asi != orig_asi)) {
 362                                 unsigned long val_in = *reg_addr;
 363                                 switch (size) {
 364                                 case 2:
 365                                         val_in = swab16(val_in);
 366                                         break;
 367                                 case 4:
 368                                         val_in = swab32(val_in);
 369                                         break;
 370                                 case 8:
 371                                         val_in = swab64(val_in);
 372                                         break;
 373                                 case 16:
 374                                 default:
 375                                         BUG();
 376                                         break;
 377                                 };
 378                                 *reg_addr = val_in;
 379                         }
 380                         break;
 381
 382                 case store:
 383                         err = do_int_store(((insn>>25)&0x1f), size,
 384                                            (unsigned long *) addr, regs,
 385                                            asi, orig_asi);
 386                         break;
 387
 388                 default:
 389                         panic("Impossible kernel unaligned trap.");
 390                         /* Not reached... */
 391                 }
 392                 if (unlikely(err))
 393                         kernel_mna_trap_fault(1);
 394                 else
 395                         advance(regs);
 396         }
 397 }
 398
 399 static char popc_helper[] = {
 400 0, 1, 1, 2, 1, 2, 2, 3,
 401 1, 2, 2, 3, 2, 3, 3, 4,
 402 };
 403
 404 int handle_popc(u32 insn, struct pt_regs *regs)
 405 {
 406         u64 value;
 407         int ret, i, rd = ((insn >> 25) & 0x1f);
 408         int from_kernel = (regs->tstate & TSTATE_PRIV) != 0;
 409
 410         if (insn & 0x2000) {
 411                 maybe_flush_windows(0, 0, rd, from_kernel);
 412                 value = sign_extend_imm13(insn);
 413         } else {
 414                 maybe_flush_windows(0, insn & 0x1f, rd, from_kernel);
 415                 value = fetch_reg(insn & 0x1f, regs);
 416         }
 417         for (ret = 0, i = 0; i < 16; i++) {
 418                 ret += popc_helper[value & 0xf];
 419                 value >>= 4;
 420         }
 421         if (rd < 16) {
 422                 if (rd)
 423                         regs->u_regs[rd] = ret;
 424         } else {
 425                 if (test_thread_flag(TIF_32BIT)) {
 426                         struct reg_window32 __user *win32;
 427                         win32 = (struct reg_window32 __user *)((unsigned long)((u32)regs->u_regs[UREG_FP]));
 428                         put_user(ret, &win32->locals[rd - 16]);
 429                 } else {
 430                         struct reg_window __user *win;
 431                         win = (struct reg_window __user *)(regs->u_regs[UREG_FP] + STACK_BIAS);
 432                         put_user(ret, &win->locals[rd - 16]);
 433                 }
 434         }
 435         advance(regs);
 436         return 1;
 437 }
 438
 439 extern void do_fpother(struct pt_regs *regs);
 440 extern void do_privact(struct pt_regs *regs);
 441 extern void spitfire_data_access_exception(struct pt_regs *regs,
 442                                            unsigned long sfsr,
 443                                            unsigned long sfar);
 444 extern void sun4v_data_access_exception(struct pt_regs *regs,
 445                                         unsigned long addr,
 446                                         unsigned long type_ctx);
 447
 448 int handle_ldf_stq(u32 insn, struct pt_regs *regs)
 449 {
 450         unsigned long addr = compute_effective_address(regs, insn, 0);
 451         int freg = ((insn >> 25) & 0x1e) | ((insn >> 20) & 0x20);
 452         struct fpustate *f = FPUSTATE;
 453         int asi = decode_asi(insn, regs);
 454         int flag = (freg < 32) ? FPRS_DL : FPRS_DU;
 455
 456         save_and_clear_fpu();
 457         current_thread_info()->xfsr[0] &= ~0x1c000;
 458         if (freg & 3) {
 459                 current_thread_info()->xfsr[0] |= (6 << 14) /* invalid_fp_register */;
 460                 do_fpother(regs);
 461                 return 0;
 462         }
 463         if (insn & 0x200000) {
 464                 /* STQ */
 465                 u64 first = 0, second = 0;
 466
 467                 if (current_thread_info()->fpsaved[0] & flag) {
 468                         first = *(u64 *)&f->regs[freg];
 469                         second = *(u64 *)&f->regs[freg+2];
 470                 }
 471                 if (asi < 0x80) {
 472                         do_privact(regs);
 473                         return 1;
 474                 }
 475                 switch (asi) {
 476                 case ASI_P:
 477                 case ASI_S: break;
 478                 case ASI_PL:
 479                 case ASI_SL:
 480                         {
 481                                 /* Need to convert endians */
 482                                 u64 tmp = __swab64p(&first);
 483
 484                                 first = __swab64p(&second);
 485                                 second = tmp;
 486                                 break;
 487                         }
 488                 default:
 489                         if (tlb_type == hypervisor)
 490                                 sun4v_data_access_exception(regs, addr, 0);
 491                         else
 492                                 spitfire_data_access_exception(regs, 0, addr);
 493                         return 1;
 494                 }
 495                 if (put_user (first >> 32, (u32 __user *)addr) ||
 496                     __put_user ((u32)first, (u32 __user *)(addr + 4)) ||
 497                     __put_user (second >> 32, (u32 __user *)(addr + 8)) ||
 498                     __put_user ((u32)second, (u32 __user *)(addr + 12))) {
 499                         if (tlb_type == hypervisor)
 500                                 sun4v_data_access_exception(regs, addr, 0);
 501                         else
 502                                 spitfire_data_access_exception(regs, 0, addr);
 503                         return 1;
 504                 }
 505         } else {
 506                 /* LDF, LDDF, LDQF */
 507                 u32 data[4] __attribute__ ((aligned(8)));
 508                 int size, i;
 509                 int err;
 510
 511                 if (asi < 0x80) {
 512                         do_privact(regs);
 513                         return 1;
 514                 } else if (asi > ASI_SNFL) {
 515                         if (tlb_type == hypervisor)
 516                                 sun4v_data_access_exception(regs, addr, 0);
 517                         else
 518                                 spitfire_data_access_exception(regs, 0, addr);
 519                         return 1;
 520                 }
 521                 switch (insn & 0x180000) {
 522                 case 0x000000: size = 1; break;
 523                 case 0x100000: size = 4; break;
 524                 default: size = 2; break;
 525                 }
 526                 for (i = 0; i < size; i++)
 527                         data[i] = 0;
 528
 529                 err = get_user (data[0], (u32 __user *) addr);
 530                 if (!err) {
 531                         for (i = 1; i < size; i++)
 532                                 err |= __get_user (data[i], (u32 __user *)(addr + 4*i));
 533                 }
 534                 if (err && !(asi & 0x2 /* NF */)) {
 535                         if (tlb_type == hypervisor)
 536                                 sun4v_data_access_exception(regs, addr, 0);
 537                         else
 538                                 spitfire_data_access_exception(regs, 0, addr);
 539                         return 1;
 540                 }
 541                 if (asi & 0x8) /* Little */ {
 542                         u64 tmp;
 543
 544                         switch (size) {
 545                         case 1: data[0] = le32_to_cpup(data + 0); break;
 546                         default:*(u64 *)(data + 0) = le64_to_cpup((u64 *)(data + 0));
 547                                 break;
 548                         case 4: tmp = le64_to_cpup((u64 *)(data + 0));
 549                                 *(u64 *)(data + 0) = le64_to_cpup((u64 *)(data + 2));
 550                                 *(u64 *)(data + 2) = tmp;
 551                                 break;
 552                         }
 553                 }
 554                 if (!(current_thread_info()->fpsaved[0] & FPRS_FEF)) {
 555                         current_thread_info()->fpsaved[0] = FPRS_FEF;
 556                         current_thread_info()->gsr[0] = 0;
 557                 }
 558                 if (!(current_thread_info()->fpsaved[0] & flag)) {
 559                         if (freg < 32)
 560                                 memset(f->regs, 0, 32*sizeof(u32));
 561                         else
 562                                 memset(f->regs+32, 0, 32*sizeof(u32));
 563                 }
 564                 memcpy(f->regs + freg, data, size * 4);
 565                 current_thread_info()->fpsaved[0] |= flag;
 566         }
 567         advance(regs);
 568         return 1;
 569 }
 570
 571 void handle_ld_nf(u32 insn, struct pt_regs *regs)
 572 {
 573         int rd = ((insn >> 25) & 0x1f);
 574         int from_kernel = (regs->tstate & TSTATE_PRIV) != 0;
 575         unsigned long *reg;
 576
 577         maybe_flush_windows(0, 0, rd, from_kernel);
 578         reg = fetch_reg_addr(rd, regs);
 579         if (from_kernel || rd < 16) {
 580                 reg[0] = 0;
 581                 if ((insn & 0x780000) == 0x180000)
 582                         reg[1] = 0;
 583         } else if (test_thread_flag(TIF_32BIT)) {
 584                 put_user(0, (int __user *) reg);
 585                 if ((insn & 0x780000) == 0x180000)
 586                         put_user(0, ((int __user *) reg) + 1);
 587         } else {
 588                 put_user(0, (unsigned long __user *) reg);
 589                 if ((insn & 0x780000) == 0x180000)
 590                         put_user(0, (unsigned long __user *) reg + 1);
 591         }
 592         advance(regs);
 593 }
 594
 595 void handle_lddfmna(struct pt_regs *regs, unsigned long sfar, unsigned long sfsr)
 596 {
 597         unsigned long pc = regs->tpc;
 598         unsigned long tstate = regs->tstate;
 599         u32 insn;
 600         u32 first, second;
 601         u64 value;
 602         u8 freg;
 603         int flag;
 604         struct fpustate *f = FPUSTATE;
 605
 606         if (tstate & TSTATE_PRIV)
 607                 die_if_kernel("lddfmna from kernel", regs);
 608         if (test_thread_flag(TIF_32BIT))
 609                 pc = (u32)pc;
 610         if (get_user(insn, (u32 __user *) pc) != -EFAULT) {
 611                 int asi = decode_asi(insn, regs);
 612                 if ((asi > ASI_SNFL) ||
 613                     (asi < ASI_P))
 614                         goto daex;
 615                 if (get_user(first, (u32 __user *)sfar) ||
 616                      get_user(second, (u32 __user *)(sfar + 4))) {
 617                         if (asi & 0x2) /* NF */ {
 618                                 first = 0; second = 0;
 619                         } else
 620                                 goto daex;
 621                 }
 622                 save_and_clear_fpu();
 623                 freg = ((insn >> 25) & 0x1e) | ((insn >> 20) & 0x20);
 624                 value = (((u64)first) << 32) | second;
 625                 if (asi & 0x8) /* Little */
 626                         value = __swab64p(&value);
 627                 flag = (freg < 32) ? FPRS_DL : FPRS_DU;
 628                 if (!(current_thread_info()->fpsaved[0] & FPRS_FEF)) {
 629                         current_thread_info()->fpsaved[0] = FPRS_FEF;
 630                         current_thread_info()->gsr[0] = 0;
 631                 }
 632                 if (!(current_thread_info()->fpsaved[0] & flag)) {
 633                         if (freg < 32)
 634                                 memset(f->regs, 0, 32*sizeof(u32));
 635                         else
 636                                 memset(f->regs+32, 0, 32*sizeof(u32));
 637                 }
 638                 *(u64 *)(f->regs + freg) = value;
 639                 current_thread_info()->fpsaved[0] |= flag;
 640         } else {
 641 daex:
 642                 if (tlb_type == hypervisor)
 643                         sun4v_data_access_exception(regs, sfar, sfsr);
 644                 else
 645                         spitfire_data_access_exception(regs, sfsr, sfar);
 646                 return;
 647         }
 648         advance(regs);
 649         return;
 650 }
 651
 652 void handle_stdfmna(struct pt_regs *regs, unsigned long sfar, unsigned long sfsr)
 653 {
 654         unsigned long pc = regs->tpc;
 655         unsigned long tstate = regs->tstate;
 656         u32 insn;
 657         u64 value;
 658         u8 freg;
 659         int flag;
 660         struct fpustate *f = FPUSTATE;
 661
 662         if (tstate & TSTATE_PRIV)
 663                 die_if_kernel("stdfmna from kernel", regs);
 664         if (test_thread_flag(TIF_32BIT))
 665                 pc = (u32)pc;
 666         if (get_user(insn, (u32 __user *) pc) != -EFAULT) {
 667                 int asi = decode_asi(insn, regs);
 668                 freg = ((insn >> 25) & 0x1e) | ((insn >> 20) & 0x20);
 669                 value = 0;
 670                 flag = (freg < 32) ? FPRS_DL : FPRS_DU;
 671                 if ((asi > ASI_SNFL) ||
 672                     (asi < ASI_P))
 673                         goto daex;
 674                 save_and_clear_fpu();
 675                 if (current_thread_info()->fpsaved[0] & flag)
 676                         value = *(u64 *)&f->regs[freg];
 677                 switch (asi) {
 678                 case ASI_P:
 679                 case ASI_S: break;
 680                 case ASI_PL:
 681                 case ASI_SL:
 682                         value = __swab64p(&value); break;
 683                 default: goto daex;
 684                 }
 685                 if (put_user (value >> 32, (u32 __user *) sfar) ||
 686                     __put_user ((u32)value, (u32 __user *)(sfar + 4)))
 687                         goto daex;
 688         } else {
 689 daex:
 690                 if (tlb_type == hypervisor)
 691                         sun4v_data_access_exception(regs, sfar, sfsr);
 692                 else
 693                         spitfire_data_access_exception(regs, sfsr, sfar);
 694                 return;
 695         }
 696         advance(regs);
 697         return;
 698 }