target-arm/cpu.h

   1 /*
   2  * ARM virtual CPU header
   3  *
   4  *  Copyright (c) 2003 Fabrice Bellard
   5  *
   6  * This library is free software; you can redistribute it and/or
   7  * modify it under the terms of the GNU Lesser General Public
   8  * License as published by the Free Software Foundation; either
   9  * version 2 of the License, or (at your option) any later version.
  10  *
  11  * This library is distributed in the hope that it will be useful,
  12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  14  * Lesser General Public License for more details.
  15  *
  16  * You should have received a copy of the GNU Lesser General Public
  17  * License along with this library; if not, see <http://www.gnu.org/licenses/>.
  18  */
  19 #ifndef CPU_ARM_H
  20 #define CPU_ARM_H
  21
  22 #define TARGET_LONG_BITS 32
  23
  24 #define ELF_MACHINE     EM_ARM
  25
  26 #define CPUState struct CPUARMState
  27
  28 #include "config.h"
  29 #include "qemu-common.h"
  30 #include "cpu-defs.h"
  31
  32 #include "softfloat.h"
  33
  34 #define TARGET_HAS_ICE 1
  35
  36 #define EXCP_UDEF            1   /* undefined instruction */
  37 #define EXCP_SWI             2   /* software interrupt */
  38 #define EXCP_PREFETCH_ABORT  3
  39 #define EXCP_DATA_ABORT      4
  40 #define EXCP_IRQ             5
  41 #define EXCP_FIQ             6
  42 #define EXCP_BKPT            7
  43 #define EXCP_EXCEPTION_EXIT  8   /* Return from v7M exception.  */
  44 #define EXCP_KERNEL_TRAP     9   /* Jumped to kernel code page.  */
  45 #define EXCP_STREX          10
  46
  47 #define ARMV7M_EXCP_RESET   1
  48 #define ARMV7M_EXCP_NMI     2
  49 #define ARMV7M_EXCP_HARD    3
  50 #define ARMV7M_EXCP_MEM     4
  51 #define ARMV7M_EXCP_BUS     5
  52 #define ARMV7M_EXCP_USAGE   6
  53 #define ARMV7M_EXCP_SVC     11
  54 #define ARMV7M_EXCP_DEBUG   12
  55 #define ARMV7M_EXCP_PENDSV  14
  56 #define ARMV7M_EXCP_SYSTICK 15
  57
  58 typedef void ARMWriteCPFunc(void *opaque, int cp_info,
  59                             int srcreg, int operand, uint32_t value);
  60 typedef uint32_t ARMReadCPFunc(void *opaque, int cp_info,
  61                                int dstreg, int operand);
  62
  63 struct arm_boot_info;
  64
  65 #define NB_MMU_MODES 2
  66
  67 /* We currently assume float and double are IEEE single and double
  68    precision respectively.
  69    Doing runtime conversions is tricky because VFP registers may contain
  70    integer values (eg. as the result of a FTOSI instruction).
  71    s<2n> maps to the least significant half of d<n>
  72    s<2n+1> maps to the most significant half of d<n>
  73  */
  74
  75 typedef struct CPUARMState {
  76     /* Regs for current mode.  */
  77     uint32_t regs[16];
  78     /* Frequently accessed CPSR bits are stored separately for efficiently.
  79        This contains all the other bits.  Use cpsr_{read,write} to access
  80        the whole CPSR.  */
  81     uint32_t uncached_cpsr;
  82     uint32_t spsr;
  83
  84     /* Banked registers.  */
  85     uint32_t banked_spsr[6];
  86     uint32_t banked_r13[6];
  87     uint32_t banked_r14[6];
  88
  89     /* These hold r8-r12.  */
  90     uint32_t usr_regs[5];
  91     uint32_t fiq_regs[5];
  92
  93     /* cpsr flag cache for faster execution */
  94     uint32_t CF; /* 0 or 1 */
  95     uint32_t VF; /* V is the bit 31. All other bits are undefined */
  96     uint32_t NF; /* N is bit 31. All other bits are undefined.  */
  97     uint32_t ZF; /* Z set if zero.  */
  98     uint32_t QF; /* 0 or 1 */
  99     uint32_t GE; /* cpsr[19:16] */
 100     uint32_t thumb; /* cpsr[5]. 0 = arm mode, 1 = thumb mode. */
 101     uint32_t condexec_bits; /* IT bits.  cpsr[15:10,26:25].  */
 102
 103     /* System control coprocessor (cp15) */
 104     struct {
 105         uint32_t c0_cpuid;
 106         uint32_t c0_cachetype;
 107         uint32_t c0_ccsid[16]; /* Cache size.  */
 108         uint32_t c0_clid; /* Cache level.  */
 109         uint32_t c0_cssel; /* Cache size selection.  */
 110         uint32_t c0_c1[8]; /* Feature registers.  */
 111         uint32_t c0_c2[8]; /* Instruction set registers.  */
 112         uint32_t c1_sys; /* System control register.  */
 113         uint32_t c1_coproc; /* Coprocessor access register.  */
 114         uint32_t c1_xscaleauxcr; /* XScale auxiliary control register.  */
 115         uint32_t c2_base0; /* MMU translation table base 0.  */
 116         uint32_t c2_base1; /* MMU translation table base 1.  */
 117         uint32_t c2_control; /* MMU translation table base control.  */
 118         uint32_t c2_mask; /* MMU translation table base selection mask.  */
 119         uint32_t c2_base_mask; /* MMU translation table base 0 mask. */
 120         uint32_t c2_data; /* MPU data cachable bits.  */
 121         uint32_t c2_insn; /* MPU instruction cachable bits.  */
 122         uint32_t c3; /* MMU domain access control register
 123                         MPU write buffer control.  */
 124         uint32_t c5_insn; /* Fault status registers.  */
 125         uint32_t c5_data;
 126         uint32_t c6_region[8]; /* MPU base/size registers.  */
 127         uint32_t c6_insn; /* Fault address registers.  */
 128         uint32_t c6_data;
 129         uint32_t c9_insn; /* Cache lockdown registers.  */
 130         uint32_t c9_data;
 131         uint32_t c13_fcse; /* FCSE PID.  */
 132         uint32_t c13_context; /* Context ID.  */
 133         uint32_t c13_tls1; /* User RW Thread register.  */
 134         uint32_t c13_tls2; /* User RO Thread register.  */
 135         uint32_t c13_tls3; /* Privileged Thread register.  */
 136         uint32_t c15_cpar; /* XScale Coprocessor Access Register */
 137         uint32_t c15_ticonfig; /* TI925T configuration byte.  */
 138         uint32_t c15_i_max; /* Maximum D-cache dirty line index.  */
 139         uint32_t c15_i_min; /* Minimum D-cache dirty line index.  */
 140         uint32_t c15_threadid; /* TI debugger thread-ID.  */
 141     } cp15;
 142
 143     struct {
 144         uint32_t other_sp;
 145         uint32_t vecbase;
 146         uint32_t basepri;
 147         uint32_t control;
 148         int current_sp;
 149         int exception;
 150         int pending_exception;
 151     } v7m;
 152
 153     /* Thumb-2 EE state.  */
 154     uint32_t teecr;
 155     uint32_t teehbr;
 156
 157     /* Internal CPU feature flags.  */
 158     uint32_t features;
 159
 160     /* VFP coprocessor state.  */
 161     struct {
 162         float64 regs[32];
 163
 164         uint32_t xregs[16];
 165         /* We store these fpcsr fields separately for convenience.  */
 166         int vec_len;
 167         int vec_stride;
 168
 169         /* scratch space when Tn are not sufficient.  */
 170         uint32_t scratch[8];
 171
 172         /* fp_status is the "normal" fp status. standard_fp_status retains
 173          * values corresponding to the ARM "Standard FPSCR Value", ie
 174          * default-NaN, flush-to-zero, round-to-nearest and is used by
 175          * any operations (generally Neon) which the architecture defines
 176          * as controlled by the standard FPSCR value rather than the FPSCR.
 177          *
 178          * To avoid having to transfer exception bits around, we simply
 179          * say that the FPSCR cumulative exception flags are the logical
 180          * OR of the flags in the two fp statuses. This relies on the
 181          * only thing which needs to read the exception flags being
 182          * an explicit FPSCR read.
 183          */
 184         float_status fp_status;
 185         float_status standard_fp_status;
 186     } vfp;
 187     uint32_t exclusive_addr;
 188     uint32_t exclusive_val;
 189     uint32_t exclusive_high;
 190 #if defined(CONFIG_USER_ONLY)
 191     uint32_t exclusive_test;
 192     uint32_t exclusive_info;
 193 #endif
 194
 195     /* iwMMXt coprocessor state.  */
 196     struct {
 197         uint64_t regs[16];
 198         uint64_t val;
 199
 200         uint32_t cregs[16];
 201     } iwmmxt;
 202
 203 #if defined(CONFIG_USER_ONLY)
 204     /* For usermode syscall translation.  */
 205     int eabi;
 206 #endif
 207
 208     CPU_COMMON
 209
 210     /* These fields after the common ones so they are preserved on reset.  */
 211
 212     /* Coprocessor IO used by peripherals */
 213     struct {
 214         ARMReadCPFunc *cp_read;
 215         ARMWriteCPFunc *cp_write;
 216         void *opaque;
 217     } cp[15];
 218     void *nvic;
 219     struct arm_boot_info *boot_info;
 220 } CPUARMState;
 221
 222 CPUARMState *cpu_arm_init(const char *cpu_model);
 223 void arm_translate_init(void);
 224 int cpu_arm_exec(CPUARMState *s);
 225 void cpu_arm_close(CPUARMState *s);
 226 void do_interrupt(CPUARMState *);
 227 void switch_mode(CPUARMState *, int);
 228 uint32_t do_arm_semihosting(CPUARMState *env);
 229
 230 /* you can call this signal handler from your SIGBUS and SIGSEGV
 231    signal handlers to inform the virtual CPU of exceptions. non zero
 232    is returned if the signal was handled by the virtual CPU.  */
 233 int cpu_arm_signal_handler(int host_signum, void *pinfo,
 234                            void *puc);
 235 int cpu_arm_handle_mmu_fault (CPUARMState *env, target_ulong address, int rw,
 236                               int mmu_idx, int is_softmuu);
 237 #define cpu_handle_mmu_fault cpu_arm_handle_mmu_fault
 238
 239 static inline void cpu_set_tls(CPUARMState *env, target_ulong newtls)
 240 {
 241   env->cp15.c13_tls2 = newtls;
 242 }
 243
 244 #define CPSR_M (0x1f)
 245 #define CPSR_T (1 << 5)
 246 #define CPSR_F (1 << 6)
 247 #define CPSR_I (1 << 7)
 248 #define CPSR_A (1 << 8)
 249 #define CPSR_E (1 << 9)
 250 #define CPSR_IT_2_7 (0xfc00)
 251 #define CPSR_GE (0xf << 16)
 252 #define CPSR_RESERVED (0xf << 20)
 253 #define CPSR_J (1 << 24)
 254 #define CPSR_IT_0_1 (3 << 25)
 255 #define CPSR_Q (1 << 27)
 256 #define CPSR_V (1 << 28)
 257 #define CPSR_C (1 << 29)
 258 #define CPSR_Z (1 << 30)
 259 #define CPSR_N (1 << 31)
 260 #define CPSR_NZCV (CPSR_N | CPSR_Z | CPSR_C | CPSR_V)
 261
 262 #define CPSR_IT (CPSR_IT_0_1 | CPSR_IT_2_7)
 263 #define CACHED_CPSR_BITS (CPSR_T | CPSR_GE | CPSR_IT | CPSR_Q | CPSR_NZCV)
 264 /* Bits writable in user mode.  */
 265 #define CPSR_USER (CPSR_NZCV | CPSR_Q | CPSR_GE)
 266 /* Execution state bits.  MRS read as zero, MSR writes ignored.  */
 267 #define CPSR_EXEC (CPSR_T | CPSR_IT | CPSR_J)
 268
 269 /* Return the current CPSR value.  */
 270 uint32_t cpsr_read(CPUARMState *env);
 271 /* Set the CPSR.  Note that some bits of mask must be all-set or all-clear.  */
 272 void cpsr_write(CPUARMState *env, uint32_t val, uint32_t mask);
 273
 274 /* Return the current xPSR value.  */
 275 static inline uint32_t xpsr_read(CPUARMState *env)
 276 {
 277     int ZF;
 278     ZF = (env->ZF == 0);
 279     return (env->NF & 0x80000000) | (ZF << 30)
 280         | (env->CF << 29) | ((env->VF & 0x80000000) >> 3) | (env->QF << 27)
 281         | (env->thumb << 24) | ((env->condexec_bits & 3) << 25)
 282         | ((env->condexec_bits & 0xfc) << 8)
 283         | env->v7m.exception;
 284 }
 285
 286 /* Set the xPSR.  Note that some bits of mask must be all-set or all-clear.  */
 287 static inline void xpsr_write(CPUARMState *env, uint32_t val, uint32_t mask)
 288 {
 289     if (mask & CPSR_NZCV) {
 290         env->ZF = (~val) & CPSR_Z;
 291         env->NF = val;
 292         env->CF = (val >> 29) & 1;
 293         env->VF = (val << 3) & 0x80000000;
 294     }
 295     if (mask & CPSR_Q)
 296         env->QF = ((val & CPSR_Q) != 0);
 297     if (mask & (1 << 24))
 298         env->thumb = ((val & (1 << 24)) != 0);
 299     if (mask & CPSR_IT_0_1) {
 300         env->condexec_bits &= ~3;
 301         env->condexec_bits |= (val >> 25) & 3;
 302     }
 303     if (mask & CPSR_IT_2_7) {
 304         env->condexec_bits &= 3;
 305         env->condexec_bits |= (val >> 8) & 0xfc;
 306     }
 307     if (mask & 0x1ff) {
 308         env->v7m.exception = val & 0x1ff;
 309     }
 310 }
 311
 312 /* Return the current FPSCR value.  */
 313 uint32_t vfp_get_fpscr(CPUARMState *env);
 314 void vfp_set_fpscr(CPUARMState *env, uint32_t val);
 315
 316 enum arm_cpu_mode {
 317   ARM_CPU_MODE_USR = 0x10,
 318   ARM_CPU_MODE_FIQ = 0x11,
 319   ARM_CPU_MODE_IRQ = 0x12,
 320   ARM_CPU_MODE_SVC = 0x13,
 321   ARM_CPU_MODE_ABT = 0x17,
 322   ARM_CPU_MODE_UND = 0x1b,
 323   ARM_CPU_MODE_SYS = 0x1f
 324 };
 325
 326 /* VFP system registers.  */
 327 #define ARM_VFP_FPSID   0
 328 #define ARM_VFP_FPSCR   1
 329 #define ARM_VFP_MVFR1   6
 330 #define ARM_VFP_MVFR0   7
 331 #define ARM_VFP_FPEXC   8
 332 #define ARM_VFP_FPINST  9
 333 #define ARM_VFP_FPINST2 10
 334
 335 /* iwMMXt coprocessor control registers.  */
 336 #define ARM_IWMMXT_wCID         0
 337 #define ARM_IWMMXT_wCon         1
 338 #define ARM_IWMMXT_wCSSF        2
 339 #define ARM_IWMMXT_wCASF        3
 340 #define ARM_IWMMXT_wCGR0        8
 341 #define ARM_IWMMXT_wCGR1        9
 342 #define ARM_IWMMXT_wCGR2        10
 343 #define ARM_IWMMXT_wCGR3        11
 344
 345 enum arm_features {
 346     ARM_FEATURE_VFP,
 347     ARM_FEATURE_AUXCR,  /* ARM1026 Auxiliary control register.  */
 348     ARM_FEATURE_XSCALE, /* Intel XScale extensions.  */
 349     ARM_FEATURE_IWMMXT, /* Intel iwMMXt extension.  */
 350     ARM_FEATURE_V6,
 351     ARM_FEATURE_V6K,
 352     ARM_FEATURE_V7,
 353     ARM_FEATURE_THUMB2,
 354     ARM_FEATURE_MPU,    /* Only has Memory Protection Unit, not full MMU.  */
 355     ARM_FEATURE_VFP3,
 356     ARM_FEATURE_VFP_FP16,
 357     ARM_FEATURE_NEON,
 358     ARM_FEATURE_DIV,
 359     ARM_FEATURE_M, /* Microcontroller profile.  */
 360     ARM_FEATURE_OMAPCP, /* OMAP specific CP15 ops handling.  */
 361     ARM_FEATURE_THUMB2EE,
 362     ARM_FEATURE_V7MP    /* v7 Multiprocessing Extensions */
 363 };
 364
 365 static inline int arm_feature(CPUARMState *env, int feature)
 366 {
 367     return (env->features & (1u << feature)) != 0;
 368 }
 369
 370 void arm_cpu_list(FILE *f, fprintf_function cpu_fprintf);
 371
 372 /* Interface between CPU and Interrupt controller.  */
 373 void armv7m_nvic_set_pending(void *opaque, int irq);
 374 int armv7m_nvic_acknowledge_irq(void *opaque);
 375 void armv7m_nvic_complete_irq(void *opaque, int irq);
 376
 377 void cpu_arm_set_cp_io(CPUARMState *env, int cpnum,
 378                        ARMReadCPFunc *cp_read, ARMWriteCPFunc *cp_write,
 379                        void *opaque);
 380
 381 /* Does the core conform to the the "MicroController" profile. e.g. Cortex-M3.
 382    Note the M in older cores (eg. ARM7TDMI) stands for Multiply. These are
 383    conventional cores (ie. Application or Realtime profile).  */
 384
 385 #define IS_M(env) arm_feature(env, ARM_FEATURE_M)
 386 #define ARM_CPUID(env) (env->cp15.c0_cpuid)
 387
 388 #define ARM_CPUID_ARM1026     0x4106a262
 389 #define ARM_CPUID_ARM926      0x41069265
 390 #define ARM_CPUID_ARM946      0x41059461
 391 #define ARM_CPUID_TI915T      0x54029152
 392 #define ARM_CPUID_TI925T      0x54029252
 393 #define ARM_CPUID_PXA250      0x69052100
 394 #define ARM_CPUID_PXA255      0x69052d00
 395 #define ARM_CPUID_PXA260      0x69052903
 396 #define ARM_CPUID_PXA261      0x69052d05
 397 #define ARM_CPUID_PXA262      0x69052d06
 398 #define ARM_CPUID_PXA270      0x69054110
 399 #define ARM_CPUID_PXA270_A0   0x69054110
 400 #define ARM_CPUID_PXA270_A1   0x69054111
 401 #define ARM_CPUID_PXA270_B0   0x69054112
 402 #define ARM_CPUID_PXA270_B1   0x69054113
 403 #define ARM_CPUID_PXA270_C0   0x69054114
 404 #define ARM_CPUID_PXA270_C5   0x69054117
 405 #define ARM_CPUID_ARM1136     0x4117b363
 406 #define ARM_CPUID_ARM1136_R2  0x4107b362
 407 #define ARM_CPUID_ARM11MPCORE 0x410fb022
 408 #define ARM_CPUID_CORTEXA8    0x410fc080
 409 #define ARM_CPUID_CORTEXA9    0x410fc090
 410 #define ARM_CPUID_CORTEXM3    0x410fc231
 411 #define ARM_CPUID_ANY         0xffffffff
 412
 413 #if defined(CONFIG_USER_ONLY)
 414 #define TARGET_PAGE_BITS 12
 415 #else
 416 /* The ARM MMU allows 1k pages.  */
 417 /* ??? Linux doesn't actually use these, and they're deprecated in recent
 418    architecture revisions.  Maybe a configure option to disable them.  */
 419 #define TARGET_PAGE_BITS 10
 420 #endif
 421
 422 #define TARGET_PHYS_ADDR_SPACE_BITS 32
 423 #define TARGET_VIRT_ADDR_SPACE_BITS 32
 424
 425 #define cpu_init cpu_arm_init
 426 #define cpu_exec cpu_arm_exec
 427 #define cpu_gen_code cpu_arm_gen_code
 428 #define cpu_signal_handler cpu_arm_signal_handler
 429 #define cpu_list arm_cpu_list
 430
 431 #define CPU_SAVE_VERSION 2
 432
 433 /* MMU modes definitions */
 434 #define MMU_MODE0_SUFFIX _kernel
 435 #define MMU_MODE1_SUFFIX _user
 436 #define MMU_USER_IDX 1
 437 static inline int cpu_mmu_index (CPUState *env)
 438 {
 439     return (env->uncached_cpsr & CPSR_M) == ARM_CPU_MODE_USR ? 1 : 0;
 440 }
 441
 442 #if defined(CONFIG_USER_ONLY)
 443 static inline void cpu_clone_regs(CPUState *env, target_ulong newsp)
 444 {
 445     if (newsp)
 446         env->regs[13] = newsp;
 447     env->regs[0] = 0;
 448 }
 449 #endif
 450
 451 #include "cpu-all.h"
 452
 453 /* Bit usage in the TB flags field: */
 454 #define ARM_TBFLAG_THUMB_SHIFT      0
 455 #define ARM_TBFLAG_THUMB_MASK       (1 << ARM_TBFLAG_THUMB_SHIFT)
 456 #define ARM_TBFLAG_VECLEN_SHIFT     1
 457 #define ARM_TBFLAG_VECLEN_MASK      (0x7 << ARM_TBFLAG_VECLEN_SHIFT)
 458 #define ARM_TBFLAG_VECSTRIDE_SHIFT  4
 459 #define ARM_TBFLAG_VECSTRIDE_MASK   (0x3 << ARM_TBFLAG_VECSTRIDE_SHIFT)
 460 #define ARM_TBFLAG_PRIV_SHIFT       6
 461 #define ARM_TBFLAG_PRIV_MASK        (1 << ARM_TBFLAG_PRIV_SHIFT)
 462 #define ARM_TBFLAG_VFPEN_SHIFT      7
 463 #define ARM_TBFLAG_VFPEN_MASK       (1 << ARM_TBFLAG_VFPEN_SHIFT)
 464 #define ARM_TBFLAG_CONDEXEC_SHIFT   8
 465 #define ARM_TBFLAG_CONDEXEC_MASK    (0xff << ARM_TBFLAG_CONDEXEC_SHIFT)
 466 /* Bits 31..16 are currently unused. */
 467
 468 /* some convenience accessor macros */
 469 #define ARM_TBFLAG_THUMB(F) \
 470     (((F) & ARM_TBFLAG_THUMB_MASK) >> ARM_TBFLAG_THUMB_SHIFT)
 471 #define ARM_TBFLAG_VECLEN(F) \
 472     (((F) & ARM_TBFLAG_VECLEN_MASK) >> ARM_TBFLAG_VECLEN_SHIFT)
 473 #define ARM_TBFLAG_VECSTRIDE(F) \
 474     (((F) & ARM_TBFLAG_VECSTRIDE_MASK) >> ARM_TBFLAG_VECSTRIDE_SHIFT)
 475 #define ARM_TBFLAG_PRIV(F) \
 476     (((F) & ARM_TBFLAG_PRIV_MASK) >> ARM_TBFLAG_PRIV_SHIFT)
 477 #define ARM_TBFLAG_VFPEN(F) \
 478     (((F) & ARM_TBFLAG_VFPEN_MASK) >> ARM_TBFLAG_VFPEN_SHIFT)
 479 #define ARM_TBFLAG_CONDEXEC(F) \
 480     (((F) & ARM_TBFLAG_CONDEXEC_MASK) >> ARM_TBFLAG_CONDEXEC_SHIFT)
 481
 482 static inline void cpu_get_tb_cpu_state(CPUState *env, target_ulong *pc,
 483                                         target_ulong *cs_base, int *flags)
 484 {
 485     int privmode;
 486     *pc = env->regs[15];
 487     *cs_base = 0;
 488     *flags = (env->thumb << ARM_TBFLAG_THUMB_SHIFT)
 489         | (env->vfp.vec_len << ARM_TBFLAG_VECLEN_SHIFT)
 490         | (env->vfp.vec_stride << ARM_TBFLAG_VECSTRIDE_SHIFT)
 491         | (env->condexec_bits << ARM_TBFLAG_CONDEXEC_SHIFT);
 492     if (arm_feature(env, ARM_FEATURE_M)) {
 493         privmode = !((env->v7m.exception == 0) && (env->v7m.control & 1));
 494     } else {
 495         privmode = (env->uncached_cpsr & CPSR_M) != ARM_CPU_MODE_USR;
 496     }
 497     if (privmode) {
 498         *flags |= ARM_TBFLAG_PRIV_MASK;
 499     }
 500     if (env->vfp.xregs[ARM_VFP_FPEXC] & (1 << 30)) {
 501         *flags |= ARM_TBFLAG_VFPEN_MASK;
 502     }
 503 }
 504
 505 #endif