target-alpha/cpu.h

   1 /*
   2  *  Alpha emulation cpu definitions for qemu.
   3  *
   4  *  Copyright (c) 2007 Jocelyn Mayer
   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
  20 #if !defined (__CPU_ALPHA_H__)
  21 #define __CPU_ALPHA_H__
  22
  23 #include "config.h"
  24
  25 #define TARGET_LONG_BITS 64
  26
  27 #define CPUState struct CPUAlphaState
  28
  29 #include "cpu-defs.h"
  30
  31 #include <setjmp.h>
  32
  33 #include "softfloat.h"
  34
  35 #define TARGET_HAS_ICE 1
  36
  37 #define ELF_MACHINE     EM_ALPHA
  38
  39 #define ICACHE_LINE_SIZE 32
  40 #define DCACHE_LINE_SIZE 32
  41
  42 #define TARGET_PAGE_BITS 13
  43
  44 /* ??? EV4 has 34 phys addr bits, EV5 has 40, EV6 has 44.  */
  45 #define TARGET_PHYS_ADDR_SPACE_BITS     44
  46 #define TARGET_VIRT_ADDR_SPACE_BITS     (30 + TARGET_PAGE_BITS)
  47
  48 /* Alpha major type */
  49 enum {
  50     ALPHA_EV3  = 1,
  51     ALPHA_EV4  = 2,
  52     ALPHA_SIM  = 3,
  53     ALPHA_LCA  = 4,
  54     ALPHA_EV5  = 5, /* 21164 */
  55     ALPHA_EV45 = 6, /* 21064A */
  56     ALPHA_EV56 = 7, /* 21164A */
  57 };
  58
  59 /* EV4 minor type */
  60 enum {
  61     ALPHA_EV4_2 = 0,
  62     ALPHA_EV4_3 = 1,
  63 };
  64
  65 /* LCA minor type */
  66 enum {
  67     ALPHA_LCA_1 = 1, /* 21066 */
  68     ALPHA_LCA_2 = 2, /* 20166 */
  69     ALPHA_LCA_3 = 3, /* 21068 */
  70     ALPHA_LCA_4 = 4, /* 21068 */
  71     ALPHA_LCA_5 = 5, /* 21066A */
  72     ALPHA_LCA_6 = 6, /* 21068A */
  73 };
  74
  75 /* EV5 minor type */
  76 enum {
  77     ALPHA_EV5_1 = 1, /* Rev BA, CA */
  78     ALPHA_EV5_2 = 2, /* Rev DA, EA */
  79     ALPHA_EV5_3 = 3, /* Pass 3 */
  80     ALPHA_EV5_4 = 4, /* Pass 3.2 */
  81     ALPHA_EV5_5 = 5, /* Pass 4 */
  82 };
  83
  84 /* EV45 minor type */
  85 enum {
  86     ALPHA_EV45_1 = 1, /* Pass 1 */
  87     ALPHA_EV45_2 = 2, /* Pass 1.1 */
  88     ALPHA_EV45_3 = 3, /* Pass 2 */
  89 };
  90
  91 /* EV56 minor type */
  92 enum {
  93     ALPHA_EV56_1 = 1, /* Pass 1 */
  94     ALPHA_EV56_2 = 2, /* Pass 2 */
  95 };
  96
  97 enum {
  98     IMPLVER_2106x = 0, /* EV4, EV45 & LCA45 */
  99     IMPLVER_21164 = 1, /* EV5, EV56 & PCA45 */
 100     IMPLVER_21264 = 2, /* EV6, EV67 & EV68x */
 101     IMPLVER_21364 = 3, /* EV7 & EV79 */
 102 };
 103
 104 enum {
 105     AMASK_BWX      = 0x00000001,
 106     AMASK_FIX      = 0x00000002,
 107     AMASK_CIX      = 0x00000004,
 108     AMASK_MVI      = 0x00000100,
 109     AMASK_TRAP     = 0x00000200,
 110     AMASK_PREFETCH = 0x00001000,
 111 };
 112
 113 enum {
 114     VAX_ROUND_NORMAL = 0,
 115     VAX_ROUND_CHOPPED,
 116 };
 117
 118 enum {
 119     IEEE_ROUND_NORMAL = 0,
 120     IEEE_ROUND_DYNAMIC,
 121     IEEE_ROUND_PLUS,
 122     IEEE_ROUND_MINUS,
 123     IEEE_ROUND_CHOPPED,
 124 };
 125
 126 /* IEEE floating-point operations encoding */
 127 /* Trap mode */
 128 enum {
 129     FP_TRAP_I   = 0x0,
 130     FP_TRAP_U   = 0x1,
 131     FP_TRAP_S  = 0x4,
 132     FP_TRAP_SU  = 0x5,
 133     FP_TRAP_SUI = 0x7,
 134 };
 135
 136 /* Rounding mode */
 137 enum {
 138     FP_ROUND_CHOPPED = 0x0,
 139     FP_ROUND_MINUS   = 0x1,
 140     FP_ROUND_NORMAL  = 0x2,
 141     FP_ROUND_DYNAMIC = 0x3,
 142 };
 143
 144 /* FPCR bits */
 145 #define FPCR_SUM                (1ULL << 63)
 146 #define FPCR_INED               (1ULL << 62)
 147 #define FPCR_UNFD               (1ULL << 61)
 148 #define FPCR_UNDZ               (1ULL << 60)
 149 #define FPCR_DYN_SHIFT          58
 150 #define FPCR_DYN_CHOPPED        (0ULL << FPCR_DYN_SHIFT)
 151 #define FPCR_DYN_MINUS          (1ULL << FPCR_DYN_SHIFT)
 152 #define FPCR_DYN_NORMAL         (2ULL << FPCR_DYN_SHIFT)
 153 #define FPCR_DYN_PLUS           (3ULL << FPCR_DYN_SHIFT)
 154 #define FPCR_DYN_MASK           (3ULL << FPCR_DYN_SHIFT)
 155 #define FPCR_IOV                (1ULL << 57)
 156 #define FPCR_INE                (1ULL << 56)
 157 #define FPCR_UNF                (1ULL << 55)
 158 #define FPCR_OVF                (1ULL << 54)
 159 #define FPCR_DZE                (1ULL << 53)
 160 #define FPCR_INV                (1ULL << 52)
 161 #define FPCR_OVFD               (1ULL << 51)
 162 #define FPCR_DZED               (1ULL << 50)
 163 #define FPCR_INVD               (1ULL << 49)
 164 #define FPCR_DNZ                (1ULL << 48)
 165 #define FPCR_DNOD               (1ULL << 47)
 166 #define FPCR_STATUS_MASK        (FPCR_IOV | FPCR_INE | FPCR_UNF \
 167                                  | FPCR_OVF | FPCR_DZE | FPCR_INV)
 168
 169 /* The silly software trap enables implemented by the kernel emulation.
 170    These are more or less architecturally required, since the real hardware
 171    has read-as-zero bits in the FPCR when the features aren't implemented.
 172    For the purposes of QEMU, we pretend the FPCR can hold everything.  */
 173 #define SWCR_TRAP_ENABLE_INV    (1ULL << 1)
 174 #define SWCR_TRAP_ENABLE_DZE    (1ULL << 2)
 175 #define SWCR_TRAP_ENABLE_OVF    (1ULL << 3)
 176 #define SWCR_TRAP_ENABLE_UNF    (1ULL << 4)
 177 #define SWCR_TRAP_ENABLE_INE    (1ULL << 5)
 178 #define SWCR_TRAP_ENABLE_DNO    (1ULL << 6)
 179 #define SWCR_TRAP_ENABLE_MASK   ((1ULL << 7) - (1ULL << 1))
 180
 181 #define SWCR_MAP_DMZ            (1ULL << 12)
 182 #define SWCR_MAP_UMZ            (1ULL << 13)
 183 #define SWCR_MAP_MASK           (SWCR_MAP_DMZ | SWCR_MAP_UMZ)
 184
 185 #define SWCR_STATUS_INV         (1ULL << 17)
 186 #define SWCR_STATUS_DZE         (1ULL << 18)
 187 #define SWCR_STATUS_OVF         (1ULL << 19)
 188 #define SWCR_STATUS_UNF         (1ULL << 20)
 189 #define SWCR_STATUS_INE         (1ULL << 21)
 190 #define SWCR_STATUS_DNO         (1ULL << 22)
 191 #define SWCR_STATUS_MASK        ((1ULL << 23) - (1ULL << 17))
 192
 193 #define SWCR_MASK  (SWCR_TRAP_ENABLE_MASK | SWCR_MAP_MASK | SWCR_STATUS_MASK)
 194
 195 /* Internal processor registers */
 196 /* XXX: TOFIX: most of those registers are implementation dependant */
 197 enum {
 198 #if defined(CONFIG_USER_ONLY)
 199     IPR_EXC_ADDR,
 200     IPR_EXC_SUM,
 201     IPR_EXC_MASK,
 202 #else
 203     /* Ebox IPRs */
 204     IPR_CC           = 0xC0,            /* 21264 */
 205     IPR_CC_CTL       = 0xC1,            /* 21264 */
 206 #define IPR_CC_CTL_ENA_SHIFT 32
 207 #define IPR_CC_CTL_COUNTER_MASK 0xfffffff0UL
 208     IPR_VA           = 0xC2,            /* 21264 */
 209     IPR_VA_CTL       = 0xC4,            /* 21264 */
 210 #define IPR_VA_CTL_VA_48_SHIFT 1
 211 #define IPR_VA_CTL_VPTB_SHIFT 30
 212     IPR_VA_FORM      = 0xC3,            /* 21264 */
 213     /* Ibox IPRs */
 214     IPR_ITB_TAG      = 0x00,            /* 21264 */
 215     IPR_ITB_PTE      = 0x01,            /* 21264 */
 216     IPR_ITB_IAP      = 0x02,
 217     IPR_ITB_IA       = 0x03,            /* 21264 */
 218     IPR_ITB_IS       = 0x04,            /* 21264 */
 219     IPR_PMPC         = 0x05,
 220     IPR_EXC_ADDR     = 0x06,            /* 21264 */
 221     IPR_IVA_FORM     = 0x07,            /* 21264 */
 222     IPR_CM           = 0x09,            /* 21264 */
 223 #define IPR_CM_SHIFT 3
 224 #define IPR_CM_MASK (3ULL << IPR_CM_SHIFT)      /* 21264 */
 225     IPR_IER          = 0x0A,            /* 21264 */
 226 #define IPR_IER_MASK 0x0000007fffffe000ULL
 227     IPR_IER_CM       = 0x0B,            /* 21264: = CM | IER */
 228     IPR_SIRR         = 0x0C,            /* 21264 */
 229 #define IPR_SIRR_SHIFT 14
 230 #define IPR_SIRR_MASK 0x7fff
 231     IPR_ISUM         = 0x0D,            /* 21264 */
 232     IPR_HW_INT_CLR   = 0x0E,            /* 21264 */
 233     IPR_EXC_SUM      = 0x0F,
 234     IPR_PAL_BASE     = 0x10,
 235     IPR_I_CTL        = 0x11,
 236 #define IPR_I_CTL_CHIP_ID_SHIFT 24      /* 21264 */
 237 #define IPR_I_CTL_BIST_FAIL (1 << 23)   /* 21264 */
 238 #define IPR_I_CTL_IC_EN_SHIFT 2         /* 21264 */
 239 #define IPR_I_CTL_SDE1_SHIFT 7          /* 21264 */
 240 #define IPR_I_CTL_HWE_SHIFT 12          /* 21264 */
 241 #define IPR_I_CTL_VA_48_SHIFT 15        /* 21264 */
 242 #define IPR_I_CTL_SPE_SHIFT 3           /* 21264 */
 243 #define IPR_I_CTL_CALL_PAL_R23_SHIFT 20 /* 21264 */
 244     IPR_I_STAT       = 0x16,            /* 21264 */
 245     IPR_IC_FLUSH     = 0x13,            /* 21264 */
 246     IPR_IC_FLUSH_ASM = 0x12,            /* 21264 */
 247     IPR_CLR_MAP      = 0x15,
 248     IPR_SLEEP        = 0x17,
 249     IPR_PCTX         = 0x40,
 250     IPR_PCTX_ASN       = 0x01,  /* field */
 251 #define IPR_PCTX_ASN_SHIFT 39
 252     IPR_PCTX_ASTER     = 0x02,  /* field */
 253 #define IPR_PCTX_ASTER_SHIFT 5
 254     IPR_PCTX_ASTRR     = 0x04,  /* field */
 255 #define IPR_PCTX_ASTRR_SHIFT 9
 256     IPR_PCTX_PPCE      = 0x08,  /* field */
 257 #define IPR_PCTX_PPCE_SHIFT 1
 258     IPR_PCTX_FPE       = 0x10,  /* field */
 259 #define IPR_PCTX_FPE_SHIFT 2
 260     IPR_PCTX_ALL       = 0x5f,  /* all fields */
 261     IPR_PCTR_CTL     = 0x14,            /* 21264 */
 262     /* Mbox IPRs */
 263     IPR_DTB_TAG0     = 0x20,            /* 21264 */
 264     IPR_DTB_TAG1     = 0xA0,            /* 21264 */
 265     IPR_DTB_PTE0     = 0x21,            /* 21264 */
 266     IPR_DTB_PTE1     = 0xA1,            /* 21264 */
 267     IPR_DTB_ALTMODE  = 0xA6,
 268     IPR_DTB_ALTMODE0 = 0x26,            /* 21264 */
 269 #define IPR_DTB_ALTMODE_MASK 3
 270     IPR_DTB_IAP      = 0xA2,
 271     IPR_DTB_IA       = 0xA3,            /* 21264 */
 272     IPR_DTB_IS0      = 0x24,
 273     IPR_DTB_IS1      = 0xA4,
 274     IPR_DTB_ASN0     = 0x25,            /* 21264 */
 275     IPR_DTB_ASN1     = 0xA5,            /* 21264 */
 276 #define IPR_DTB_ASN_SHIFT 56
 277     IPR_MM_STAT      = 0x27,            /* 21264 */
 278     IPR_M_CTL        = 0x28,            /* 21264 */
 279 #define IPR_M_CTL_SPE_SHIFT 1
 280 #define IPR_M_CTL_SPE_MASK 7
 281     IPR_DC_CTL       = 0x29,            /* 21264 */
 282     IPR_DC_STAT      = 0x2A,            /* 21264 */
 283     /* Cbox IPRs */
 284     IPR_C_DATA       = 0x2B,
 285     IPR_C_SHIFT      = 0x2C,
 286
 287     IPR_ASN,
 288     IPR_ASTEN,
 289     IPR_ASTSR,
 290     IPR_DATFX,
 291     IPR_ESP,
 292     IPR_FEN,
 293     IPR_IPIR,
 294     IPR_IPL,
 295     IPR_KSP,
 296     IPR_MCES,
 297     IPR_PERFMON,
 298     IPR_PCBB,
 299     IPR_PRBR,
 300     IPR_PTBR,
 301     IPR_SCBB,
 302     IPR_SISR,
 303     IPR_SSP,
 304     IPR_SYSPTBR,
 305     IPR_TBCHK,
 306     IPR_TBIA,
 307     IPR_TBIAP,
 308     IPR_TBIS,
 309     IPR_TBISD,
 310     IPR_TBISI,
 311     IPR_USP,
 312     IPR_VIRBND,
 313     IPR_VPTB,
 314     IPR_WHAMI,
 315     IPR_ALT_MODE,
 316 #endif
 317     IPR_LAST,
 318 };
 319
 320 typedef struct CPUAlphaState CPUAlphaState;
 321
 322 typedef struct pal_handler_t pal_handler_t;
 323 struct pal_handler_t {
 324     /* Reset */
 325     void (*reset)(CPUAlphaState *env);
 326     /* Uncorrectable hardware error */
 327     void (*machine_check)(CPUAlphaState *env);
 328     /* Arithmetic exception */
 329     void (*arithmetic)(CPUAlphaState *env);
 330     /* Interrupt / correctable hardware error */
 331     void (*interrupt)(CPUAlphaState *env);
 332     /* Data fault */
 333     void (*dfault)(CPUAlphaState *env);
 334     /* DTB miss pal */
 335     void (*dtb_miss_pal)(CPUAlphaState *env);
 336     /* DTB miss native */
 337     void (*dtb_miss_native)(CPUAlphaState *env);
 338     /* Unaligned access */
 339     void (*unalign)(CPUAlphaState *env);
 340     /* ITB miss */
 341     void (*itb_miss)(CPUAlphaState *env);
 342     /* Instruction stream access violation */
 343     void (*itb_acv)(CPUAlphaState *env);
 344     /* Reserved or privileged opcode */
 345     void (*opcdec)(CPUAlphaState *env);
 346     /* Floating point exception */
 347     void (*fen)(CPUAlphaState *env);
 348     /* Call pal instruction */
 349     void (*call_pal)(CPUAlphaState *env, uint32_t palcode);
 350 };
 351
 352 #define NB_MMU_MODES 4
 353
 354 struct CPUAlphaState {
 355     uint64_t ir[31];
 356     float64 fir[31];
 357     uint64_t pc;
 358     uint64_t lock;
 359     uint32_t pcc[2];
 360     uint64_t ipr[IPR_LAST];
 361     uint64_t ps;
 362     uint64_t unique;
 363     float_status fp_status;
 364     /* The following fields make up the FPCR, but in FP_STATUS format.  */
 365     uint8_t fpcr_exc_status;
 366     uint8_t fpcr_exc_mask;
 367     uint8_t fpcr_dyn_round;
 368     uint8_t fpcr_flush_to_zero;
 369     uint8_t fpcr_dnz;
 370     uint8_t fpcr_dnod;
 371     uint8_t fpcr_undz;
 372
 373     /* Used for HW_LD / HW_ST */
 374     uint8_t saved_mode;
 375     /* For RC and RS */
 376     uint8_t intr_flag;
 377
 378 #if TARGET_LONG_BITS > HOST_LONG_BITS
 379     /* temporary fixed-point registers
 380      * used to emulate 64 bits target on 32 bits hosts
 381      */
 382     target_ulong t0, t1;
 383 #endif
 384
 385     /* Those resources are used only in Qemu core */
 386     CPU_COMMON
 387
 388     uint32_t hflags;
 389
 390     int error_code;
 391
 392     uint32_t features;
 393     uint32_t amask;
 394     int implver;
 395     pal_handler_t *pal_handler;
 396 };
 397
 398 #define cpu_init cpu_alpha_init
 399 #define cpu_exec cpu_alpha_exec
 400 #define cpu_gen_code cpu_alpha_gen_code
 401 #define cpu_signal_handler cpu_alpha_signal_handler
 402
 403 /* MMU modes definitions */
 404 #define MMU_MODE0_SUFFIX _kernel
 405 #define MMU_MODE1_SUFFIX _executive
 406 #define MMU_MODE2_SUFFIX _supervisor
 407 #define MMU_MODE3_SUFFIX _user
 408 #define MMU_USER_IDX 3
 409 static inline int cpu_mmu_index (CPUState *env)
 410 {
 411     return (env->ps >> 3) & 3;
 412 }
 413
 414 #if defined(CONFIG_USER_ONLY)
 415 static inline void cpu_clone_regs(CPUState *env, target_ulong newsp)
 416 {
 417     if (newsp)
 418         env->ir[30] = newsp;
 419     /* FIXME: Zero syscall return value.  */
 420 }
 421 #endif
 422
 423 #include "cpu-all.h"
 424 #include "exec-all.h"
 425
 426 enum {
 427     FEATURE_ASN    = 0x00000001,
 428     FEATURE_SPS    = 0x00000002,
 429     FEATURE_VIRBND = 0x00000004,
 430     FEATURE_TBCHK  = 0x00000008,
 431 };
 432
 433 enum {
 434     EXCP_RESET            = 0x0000,
 435     EXCP_MCHK             = 0x0020,
 436     EXCP_ARITH            = 0x0060,
 437     EXCP_HW_INTERRUPT     = 0x00E0,
 438     EXCP_DFAULT           = 0x01E0,
 439     EXCP_DTB_MISS_PAL     = 0x09E0,
 440     EXCP_ITB_MISS         = 0x03E0,
 441     EXCP_ITB_ACV          = 0x07E0,
 442     EXCP_DTB_MISS_NATIVE  = 0x08E0,
 443     EXCP_UNALIGN          = 0x11E0,
 444     EXCP_OPCDEC           = 0x13E0,
 445     EXCP_FEN              = 0x17E0,
 446     EXCP_CALL_PAL         = 0x2000,
 447     EXCP_CALL_PALP        = 0x3000,
 448     EXCP_CALL_PALE        = 0x4000,
 449     /* Pseudo exception for console */
 450     EXCP_CONSOLE_DISPATCH = 0x4001,
 451     EXCP_CONSOLE_FIXUP    = 0x4002,
 452 };
 453
 454 /* Arithmetic exception */
 455 #define EXC_M_IOV       (1<<16)         /* Integer Overflow */
 456 #define EXC_M_INE       (1<<15)         /* Inexact result */
 457 #define EXC_M_UNF       (1<<14)         /* Underflow */
 458 #define EXC_M_FOV       (1<<13)         /* Overflow */
 459 #define EXC_M_DZE       (1<<12)         /* Division by zero */
 460 #define EXC_M_INV       (1<<11)         /* Invalid operation */
 461 #define EXC_M_SWC       (1<<10)         /* Software completion */
 462
 463 enum {
 464     IR_V0   = 0,
 465     IR_T0   = 1,
 466     IR_T1   = 2,
 467     IR_T2   = 3,
 468     IR_T3   = 4,
 469     IR_T4   = 5,
 470     IR_T5   = 6,
 471     IR_T6   = 7,
 472     IR_T7   = 8,
 473     IR_S0   = 9,
 474     IR_S1   = 10,
 475     IR_S2   = 11,
 476     IR_S3   = 12,
 477     IR_S4   = 13,
 478     IR_S5   = 14,
 479     IR_S6   = 15,
 480 #define IR_FP IR_S6
 481     IR_A0   = 16,
 482     IR_A1   = 17,
 483     IR_A2   = 18,
 484     IR_A3   = 19,
 485     IR_A4   = 20,
 486     IR_A5   = 21,
 487     IR_T8   = 22,
 488     IR_T9   = 23,
 489     IR_T10  = 24,
 490     IR_T11  = 25,
 491     IR_RA   = 26,
 492     IR_T12  = 27,
 493 #define IR_PV IR_T12
 494     IR_AT   = 28,
 495     IR_GP   = 29,
 496     IR_SP   = 30,
 497     IR_ZERO = 31,
 498 };
 499
 500 CPUAlphaState * cpu_alpha_init (const char *cpu_model);
 501 int cpu_alpha_exec(CPUAlphaState *s);
 502 /* you can call this signal handler from your SIGBUS and SIGSEGV
 503    signal handlers to inform the virtual CPU of exceptions. non zero
 504    is returned if the signal was handled by the virtual CPU.  */
 505 int cpu_alpha_signal_handler(int host_signum, void *pinfo,
 506                              void *puc);
 507 int cpu_alpha_handle_mmu_fault (CPUState *env, uint64_t address, int rw,
 508                                 int mmu_idx, int is_softmmu);
 509 #define cpu_handle_mmu_fault cpu_alpha_handle_mmu_fault
 510 void do_interrupt (CPUState *env);
 511
 512 uint64_t cpu_alpha_load_fpcr (CPUState *env);
 513 void cpu_alpha_store_fpcr (CPUState *env, uint64_t val);
 514 int cpu_alpha_mfpr (CPUState *env, int iprn, uint64_t *valp);
 515 int cpu_alpha_mtpr (CPUState *env, int iprn, uint64_t val, uint64_t *oldvalp);
 516 #if !defined (CONFIG_USER_ONLY)
 517 void pal_init (CPUState *env);
 518 void call_pal (CPUState *env);
 519 #endif
 520
 521 static inline void cpu_pc_from_tb(CPUState *env, TranslationBlock *tb)
 522 {
 523     env->pc = tb->pc;
 524 }
 525
 526 static inline void cpu_get_tb_cpu_state(CPUState *env, target_ulong *pc,
 527                                         target_ulong *cs_base, int *flags)
 528 {
 529     *pc = env->pc;
 530     *cs_base = 0;
 531     *flags = env->ps;
 532 }
 533
 534 #endif /* !defined (__CPU_ALPHA_H__) */