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 #ifndef ALPHA_CPU_H
  21 #define ALPHA_CPU_H
  22
  23 #include "cpu-qom.h"
  24 #include "exec/cpu-defs.h"
  25
  26 /* Alpha processors have a weak memory model */
  27 #define TCG_GUEST_DEFAULT_MO      (0)
  28
  29 #define ICACHE_LINE_SIZE 32
  30 #define DCACHE_LINE_SIZE 32
  31
  32 /* Alpha major type */
  33 enum {
  34     ALPHA_EV3  = 1,
  35     ALPHA_EV4  = 2,
  36     ALPHA_SIM  = 3,
  37     ALPHA_LCA  = 4,
  38     ALPHA_EV5  = 5, /* 21164 */
  39     ALPHA_EV45 = 6, /* 21064A */
  40     ALPHA_EV56 = 7, /* 21164A */
  41 };
  42
  43 /* EV4 minor type */
  44 enum {
  45     ALPHA_EV4_2 = 0,
  46     ALPHA_EV4_3 = 1,
  47 };
  48
  49 /* LCA minor type */
  50 enum {
  51     ALPHA_LCA_1 = 1, /* 21066 */
  52     ALPHA_LCA_2 = 2, /* 20166 */
  53     ALPHA_LCA_3 = 3, /* 21068 */
  54     ALPHA_LCA_4 = 4, /* 21068 */
  55     ALPHA_LCA_5 = 5, /* 21066A */
  56     ALPHA_LCA_6 = 6, /* 21068A */
  57 };
  58
  59 /* EV5 minor type */
  60 enum {
  61     ALPHA_EV5_1 = 1, /* Rev BA, CA */
  62     ALPHA_EV5_2 = 2, /* Rev DA, EA */
  63     ALPHA_EV5_3 = 3, /* Pass 3 */
  64     ALPHA_EV5_4 = 4, /* Pass 3.2 */
  65     ALPHA_EV5_5 = 5, /* Pass 4 */
  66 };
  67
  68 /* EV45 minor type */
  69 enum {
  70     ALPHA_EV45_1 = 1, /* Pass 1 */
  71     ALPHA_EV45_2 = 2, /* Pass 1.1 */
  72     ALPHA_EV45_3 = 3, /* Pass 2 */
  73 };
  74
  75 /* EV56 minor type */
  76 enum {
  77     ALPHA_EV56_1 = 1, /* Pass 1 */
  78     ALPHA_EV56_2 = 2, /* Pass 2 */
  79 };
  80
  81 enum {
  82     IMPLVER_2106x = 0, /* EV4, EV45 & LCA45 */
  83     IMPLVER_21164 = 1, /* EV5, EV56 & PCA45 */
  84     IMPLVER_21264 = 2, /* EV6, EV67 & EV68x */
  85     IMPLVER_21364 = 3, /* EV7 & EV79 */
  86 };
  87
  88 enum {
  89     AMASK_BWX      = 0x00000001,
  90     AMASK_FIX      = 0x00000002,
  91     AMASK_CIX      = 0x00000004,
  92     AMASK_MVI      = 0x00000100,
  93     AMASK_TRAP     = 0x00000200,
  94     AMASK_PREFETCH = 0x00001000,
  95 };
  96
  97 enum {
  98     VAX_ROUND_NORMAL = 0,
  99     VAX_ROUND_CHOPPED,
 100 };
 101
 102 enum {
 103     IEEE_ROUND_NORMAL = 0,
 104     IEEE_ROUND_DYNAMIC,
 105     IEEE_ROUND_PLUS,
 106     IEEE_ROUND_MINUS,
 107     IEEE_ROUND_CHOPPED,
 108 };
 109
 110 /* IEEE floating-point operations encoding */
 111 /* Trap mode */
 112 enum {
 113     FP_TRAP_I   = 0x0,
 114     FP_TRAP_U   = 0x1,
 115     FP_TRAP_S  = 0x4,
 116     FP_TRAP_SU  = 0x5,
 117     FP_TRAP_SUI = 0x7,
 118 };
 119
 120 /* Rounding mode */
 121 enum {
 122     FP_ROUND_CHOPPED = 0x0,
 123     FP_ROUND_MINUS   = 0x1,
 124     FP_ROUND_NORMAL  = 0x2,
 125     FP_ROUND_DYNAMIC = 0x3,
 126 };
 127
 128 /* FPCR bits -- right-shifted 32 so we can use a uint32_t.  */
 129 #define FPCR_SUM                (1U << (63 - 32))
 130 #define FPCR_INED               (1U << (62 - 32))
 131 #define FPCR_UNFD               (1U << (61 - 32))
 132 #define FPCR_UNDZ               (1U << (60 - 32))
 133 #define FPCR_DYN_SHIFT          (58 - 32)
 134 #define FPCR_DYN_CHOPPED        (0U << FPCR_DYN_SHIFT)
 135 #define FPCR_DYN_MINUS          (1U << FPCR_DYN_SHIFT)
 136 #define FPCR_DYN_NORMAL         (2U << FPCR_DYN_SHIFT)
 137 #define FPCR_DYN_PLUS           (3U << FPCR_DYN_SHIFT)
 138 #define FPCR_DYN_MASK           (3U << FPCR_DYN_SHIFT)
 139 #define FPCR_IOV                (1U << (57 - 32))
 140 #define FPCR_INE                (1U << (56 - 32))
 141 #define FPCR_UNF                (1U << (55 - 32))
 142 #define FPCR_OVF                (1U << (54 - 32))
 143 #define FPCR_DZE                (1U << (53 - 32))
 144 #define FPCR_INV                (1U << (52 - 32))
 145 #define FPCR_OVFD               (1U << (51 - 32))
 146 #define FPCR_DZED               (1U << (50 - 32))
 147 #define FPCR_INVD               (1U << (49 - 32))
 148 #define FPCR_DNZ                (1U << (48 - 32))
 149 #define FPCR_DNOD               (1U << (47 - 32))
 150 #define FPCR_STATUS_MASK        (FPCR_IOV | FPCR_INE | FPCR_UNF \
 151                                  | FPCR_OVF | FPCR_DZE | FPCR_INV)
 152
 153 /* The silly software trap enables implemented by the kernel emulation.
 154    These are more or less architecturally required, since the real hardware
 155    has read-as-zero bits in the FPCR when the features aren't implemented.
 156    For the purposes of QEMU, we pretend the FPCR can hold everything.  */
 157 #define SWCR_TRAP_ENABLE_INV    (1U << 1)
 158 #define SWCR_TRAP_ENABLE_DZE    (1U << 2)
 159 #define SWCR_TRAP_ENABLE_OVF    (1U << 3)
 160 #define SWCR_TRAP_ENABLE_UNF    (1U << 4)
 161 #define SWCR_TRAP_ENABLE_INE    (1U << 5)
 162 #define SWCR_TRAP_ENABLE_DNO    (1U << 6)
 163 #define SWCR_TRAP_ENABLE_MASK   ((1U << 7) - (1U << 1))
 164
 165 #define SWCR_MAP_DMZ            (1U << 12)
 166 #define SWCR_MAP_UMZ            (1U << 13)
 167 #define SWCR_MAP_MASK           (SWCR_MAP_DMZ | SWCR_MAP_UMZ)
 168
 169 #define SWCR_STATUS_INV         (1U << 17)
 170 #define SWCR_STATUS_DZE         (1U << 18)
 171 #define SWCR_STATUS_OVF         (1U << 19)
 172 #define SWCR_STATUS_UNF         (1U << 20)
 173 #define SWCR_STATUS_INE         (1U << 21)
 174 #define SWCR_STATUS_DNO         (1U << 22)
 175 #define SWCR_STATUS_MASK        ((1U << 23) - (1U << 17))
 176
 177 #define SWCR_STATUS_TO_EXCSUM_SHIFT  16
 178
 179 #define SWCR_MASK  (SWCR_TRAP_ENABLE_MASK | SWCR_MAP_MASK | SWCR_STATUS_MASK)
 180
 181 /* MMU modes definitions */
 182
 183 /* Alpha has 5 MMU modes: PALcode, Kernel, Executive, Supervisor, and User.
 184    The Unix PALcode only exposes the kernel and user modes; presumably
 185    executive and supervisor are used by VMS.
 186
 187    PALcode itself uses physical mode for code and kernel mode for data;
 188    there are PALmode instructions that can access data via physical mode
 189    or via an os-installed "alternate mode", which is one of the 4 above.
 190
 191    That said, we're only emulating Unix PALcode, and not attempting VMS,
 192    so we don't need to implement Executive and Supervisor.  QEMU's own
 193    PALcode cheats and usees the KSEG mapping for its code+data rather than
 194    physical addresses.  */
 195
 196 #define MMU_KERNEL_IDX   0
 197 #define MMU_USER_IDX     1
 198 #define MMU_PHYS_IDX     2
 199
 200 typedef struct CPUAlphaState CPUAlphaState;
 201
 202 struct CPUAlphaState {
 203     uint64_t ir[31];
 204     float64 fir[31];
 205     uint64_t pc;
 206     uint64_t unique;
 207     uint64_t lock_addr;
 208     uint64_t lock_value;
 209
 210     /* The FPCR, and disassembled portions thereof.  */
 211     uint32_t fpcr;
 212 #ifdef CONFIG_USER_ONLY
 213     uint32_t swcr;
 214 #endif
 215     uint32_t fpcr_exc_enable;
 216     float_status fp_status;
 217     uint8_t fpcr_dyn_round;
 218     uint8_t fpcr_flush_to_zero;
 219
 220     /* Mask of PALmode, Processor State et al.  Most of this gets copied
 221        into the TranslatorBlock flags and controls code generation.  */
 222     uint32_t flags;
 223
 224     /* The high 32-bits of the processor cycle counter.  */
 225     uint32_t pcc_ofs;
 226
 227     /* These pass data from the exception logic in the translator and
 228        helpers to the OS entry point.  This is used for both system
 229        emulation and user-mode.  */
 230     uint64_t trap_arg0;
 231     uint64_t trap_arg1;
 232     uint64_t trap_arg2;
 233
 234 #if !defined(CONFIG_USER_ONLY)
 235     /* The internal data required by our emulation of the Unix PALcode.  */
 236     uint64_t exc_addr;
 237     uint64_t palbr;
 238     uint64_t ptbr;
 239     uint64_t vptptr;
 240     uint64_t sysval;
 241     uint64_t usp;
 242     uint64_t shadow[8];
 243     uint64_t scratch[24];
 244 #endif
 245
 246     /* This alarm doesn't exist in real hardware; we wish it did.  */
 247     uint64_t alarm_expire;
 248
 249     int error_code;
 250
 251     uint32_t features;
 252     uint32_t amask;
 253     int implver;
 254 };
 255
 256 /**
 257  * AlphaCPU:
 258  * @env: #CPUAlphaState
 259  *
 260  * An Alpha CPU.
 261  */
 262 struct AlphaCPU {
 263     /*< private >*/
 264     CPUState parent_obj;
 265     /*< public >*/
 266
 267     CPUNegativeOffsetState neg;
 268     CPUAlphaState env;
 269
 270     /* This alarm doesn't exist in real hardware; we wish it did.  */
 271     QEMUTimer *alarm_timer;
 272 };
 273
 274
 275 #ifndef CONFIG_USER_ONLY
 276 extern const VMStateDescription vmstate_alpha_cpu;
 277 #endif
 278
 279 void alpha_cpu_do_interrupt(CPUState *cpu);
 280 bool alpha_cpu_exec_interrupt(CPUState *cpu, int int_req);
 281 void alpha_cpu_dump_state(CPUState *cs, FILE *f, int flags);
 282 hwaddr alpha_cpu_get_phys_page_debug(CPUState *cpu, vaddr addr);
 283 int alpha_cpu_gdb_read_register(CPUState *cpu, GByteArray *buf, int reg);
 284 int alpha_cpu_gdb_write_register(CPUState *cpu, uint8_t *buf, int reg);
 285 void alpha_cpu_do_unaligned_access(CPUState *cpu, vaddr addr,
 286                                    MMUAccessType access_type,
 287                                    int mmu_idx, uintptr_t retaddr);
 288
 289 #define cpu_list alpha_cpu_list
 290 #define cpu_signal_handler cpu_alpha_signal_handler
 291
 292 typedef CPUAlphaState CPUArchState;
 293 typedef AlphaCPU ArchCPU;
 294
 295 #include "exec/cpu-all.h"
 296
 297 enum {
 298     FEATURE_ASN    = 0x00000001,
 299     FEATURE_SPS    = 0x00000002,
 300     FEATURE_VIRBND = 0x00000004,
 301     FEATURE_TBCHK  = 0x00000008,
 302 };
 303
 304 enum {
 305     EXCP_RESET,
 306     EXCP_MCHK,
 307     EXCP_SMP_INTERRUPT,
 308     EXCP_CLK_INTERRUPT,
 309     EXCP_DEV_INTERRUPT,
 310     EXCP_MMFAULT,
 311     EXCP_UNALIGN,
 312     EXCP_OPCDEC,
 313     EXCP_ARITH,
 314     EXCP_FEN,
 315     EXCP_CALL_PAL,
 316 };
 317
 318 /* Alpha-specific interrupt pending bits.  */
 319 #define CPU_INTERRUPT_TIMER     CPU_INTERRUPT_TGT_EXT_0
 320 #define CPU_INTERRUPT_SMP       CPU_INTERRUPT_TGT_EXT_1
 321 #define CPU_INTERRUPT_MCHK      CPU_INTERRUPT_TGT_EXT_2
 322
 323 /* OSF/1 Page table bits.  */
 324 enum {
 325     PTE_VALID = 0x0001,
 326     PTE_FOR   = 0x0002,  /* used for page protection (fault on read) */
 327     PTE_FOW   = 0x0004,  /* used for page protection (fault on write) */
 328     PTE_FOE   = 0x0008,  /* used for page protection (fault on exec) */
 329     PTE_ASM   = 0x0010,
 330     PTE_KRE   = 0x0100,
 331     PTE_URE   = 0x0200,
 332     PTE_KWE   = 0x1000,
 333     PTE_UWE   = 0x2000
 334 };
 335
 336 /* Hardware interrupt (entInt) constants.  */
 337 enum {
 338     INT_K_IP,
 339     INT_K_CLK,
 340     INT_K_MCHK,
 341     INT_K_DEV,
 342     INT_K_PERF,
 343 };
 344
 345 /* Memory management (entMM) constants.  */
 346 enum {
 347     MM_K_TNV,
 348     MM_K_ACV,
 349     MM_K_FOR,
 350     MM_K_FOE,
 351     MM_K_FOW
 352 };
 353
 354 /* Arithmetic exception (entArith) constants.  */
 355 enum {
 356     EXC_M_SWC = 1,      /* Software completion */
 357     EXC_M_INV = 2,      /* Invalid operation */
 358     EXC_M_DZE = 4,      /* Division by zero */
 359     EXC_M_FOV = 8,      /* Overflow */
 360     EXC_M_UNF = 16,     /* Underflow */
 361     EXC_M_INE = 32,     /* Inexact result */
 362     EXC_M_IOV = 64      /* Integer Overflow */
 363 };
 364
 365 /* Processor status constants.  */
 366 /* Low 3 bits are interrupt mask level.  */
 367 #define PS_INT_MASK   7u
 368
 369 /* Bits 4 and 5 are the mmu mode.  The VMS PALcode uses all 4 modes;
 370    The Unix PALcode only uses bit 4.  */
 371 #define PS_USER_MODE  8u
 372
 373 /* CPUAlphaState->flags constants.  These are layed out so that we
 374    can set or reset the pieces individually by assigning to the byte,
 375    or manipulated as a whole.  */
 376
 377 #define ENV_FLAG_PAL_SHIFT    0
 378 #define ENV_FLAG_PS_SHIFT     8
 379 #define ENV_FLAG_RX_SHIFT     16
 380 #define ENV_FLAG_FEN_SHIFT    24
 381
 382 #define ENV_FLAG_PAL_MODE     (1u << ENV_FLAG_PAL_SHIFT)
 383 #define ENV_FLAG_PS_USER      (PS_USER_MODE << ENV_FLAG_PS_SHIFT)
 384 #define ENV_FLAG_RX_FLAG      (1u << ENV_FLAG_RX_SHIFT)
 385 #define ENV_FLAG_FEN          (1u << ENV_FLAG_FEN_SHIFT)
 386
 387 #define ENV_FLAG_TB_MASK \
 388     (ENV_FLAG_PAL_MODE | ENV_FLAG_PS_USER | ENV_FLAG_FEN)
 389
 390 static inline int cpu_mmu_index(CPUAlphaState *env, bool ifetch)
 391 {
 392     int ret = env->flags & ENV_FLAG_PS_USER ? MMU_USER_IDX : MMU_KERNEL_IDX;
 393     if (env->flags & ENV_FLAG_PAL_MODE) {
 394         ret = MMU_KERNEL_IDX;
 395     }
 396     return ret;
 397 }
 398
 399 enum {
 400     IR_V0   = 0,
 401     IR_T0   = 1,
 402     IR_T1   = 2,
 403     IR_T2   = 3,
 404     IR_T3   = 4,
 405     IR_T4   = 5,
 406     IR_T5   = 6,
 407     IR_T6   = 7,
 408     IR_T7   = 8,
 409     IR_S0   = 9,
 410     IR_S1   = 10,
 411     IR_S2   = 11,
 412     IR_S3   = 12,
 413     IR_S4   = 13,
 414     IR_S5   = 14,
 415     IR_S6   = 15,
 416     IR_FP   = IR_S6,
 417     IR_A0   = 16,
 418     IR_A1   = 17,
 419     IR_A2   = 18,
 420     IR_A3   = 19,
 421     IR_A4   = 20,
 422     IR_A5   = 21,
 423     IR_T8   = 22,
 424     IR_T9   = 23,
 425     IR_T10  = 24,
 426     IR_T11  = 25,
 427     IR_RA   = 26,
 428     IR_T12  = 27,
 429     IR_PV   = IR_T12,
 430     IR_AT   = 28,
 431     IR_GP   = 29,
 432     IR_SP   = 30,
 433     IR_ZERO = 31,
 434 };
 435
 436 void alpha_translate_init(void);
 437
 438 #define ALPHA_CPU_TYPE_SUFFIX "-" TYPE_ALPHA_CPU
 439 #define ALPHA_CPU_TYPE_NAME(model) model ALPHA_CPU_TYPE_SUFFIX
 440 #define CPU_RESOLVING_TYPE TYPE_ALPHA_CPU
 441
 442 void alpha_cpu_list(void);
 443 /* you can call this signal handler from your SIGBUS and SIGSEGV
 444    signal handlers to inform the virtual CPU of exceptions. non zero
 445    is returned if the signal was handled by the virtual CPU.  */
 446 int cpu_alpha_signal_handler(int host_signum, void *pinfo,
 447                              void *puc);
 448 bool alpha_cpu_tlb_fill(CPUState *cs, vaddr address, int size,
 449                         MMUAccessType access_type, int mmu_idx,
 450                         bool probe, uintptr_t retaddr);
 451 void QEMU_NORETURN dynamic_excp(CPUAlphaState *, uintptr_t, int, int);
 452 void QEMU_NORETURN arith_excp(CPUAlphaState *, uintptr_t, int, uint64_t);
 453
 454 uint64_t cpu_alpha_load_fpcr (CPUAlphaState *env);
 455 void cpu_alpha_store_fpcr (CPUAlphaState *env, uint64_t val);
 456 uint64_t cpu_alpha_load_gr(CPUAlphaState *env, unsigned reg);
 457 void cpu_alpha_store_gr(CPUAlphaState *env, unsigned reg, uint64_t val);
 458 #ifndef CONFIG_USER_ONLY
 459 void alpha_cpu_do_transaction_failed(CPUState *cs, hwaddr physaddr,
 460                                      vaddr addr, unsigned size,
 461                                      MMUAccessType access_type,
 462                                      int mmu_idx, MemTxAttrs attrs,
 463                                      MemTxResult response, uintptr_t retaddr);
 464 #endif
 465
 466 static inline void cpu_get_tb_cpu_state(CPUAlphaState *env, target_ulong *pc,
 467                                         target_ulong *cs_base, uint32_t *pflags)
 468 {
 469     *pc = env->pc;
 470     *cs_base = 0;
 471     *pflags = env->flags & ENV_FLAG_TB_MASK;
 472 }
 473
 474 #ifdef CONFIG_USER_ONLY
 475 /* Copied from linux ieee_swcr_to_fpcr.  */
 476 static inline uint64_t alpha_ieee_swcr_to_fpcr(uint64_t swcr)
 477 {
 478     uint64_t fpcr = 0;
 479
 480     fpcr |= (swcr & SWCR_STATUS_MASK) << 35;
 481     fpcr |= (swcr & SWCR_MAP_DMZ) << 36;
 482     fpcr |= (~swcr & (SWCR_TRAP_ENABLE_INV
 483                       | SWCR_TRAP_ENABLE_DZE
 484                       | SWCR_TRAP_ENABLE_OVF)) << 48;
 485     fpcr |= (~swcr & (SWCR_TRAP_ENABLE_UNF
 486                       | SWCR_TRAP_ENABLE_INE)) << 57;
 487     fpcr |= (swcr & SWCR_MAP_UMZ ? FPCR_UNDZ | FPCR_UNFD : 0);
 488     fpcr |= (~swcr & SWCR_TRAP_ENABLE_DNO) << 41;
 489
 490     return fpcr;
 491 }
 492
 493 /* Copied from linux ieee_fpcr_to_swcr.  */
 494 static inline uint64_t alpha_ieee_fpcr_to_swcr(uint64_t fpcr)
 495 {
 496     uint64_t swcr = 0;
 497
 498     swcr |= (fpcr >> 35) & SWCR_STATUS_MASK;
 499     swcr |= (fpcr >> 36) & SWCR_MAP_DMZ;
 500     swcr |= (~fpcr >> 48) & (SWCR_TRAP_ENABLE_INV
 501                              | SWCR_TRAP_ENABLE_DZE
 502                              | SWCR_TRAP_ENABLE_OVF);
 503     swcr |= (~fpcr >> 57) & (SWCR_TRAP_ENABLE_UNF | SWCR_TRAP_ENABLE_INE);
 504     swcr |= (fpcr >> 47) & SWCR_MAP_UMZ;
 505     swcr |= (~fpcr >> 41) & SWCR_TRAP_ENABLE_DNO;
 506
 507     return swcr;
 508 }
 509 #endif /* CONFIG_USER_ONLY */
 510
 511 #endif /* ALPHA_CPU_H */