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 #include "qemu-common.h"
  25
  26 #define TARGET_LONG_BITS 64
  27
  28 #define CPUArchState struct CPUAlphaState
  29
  30 #include "cpu-defs.h"
  31
  32 #include "softfloat.h"
  33
  34 #define TARGET_HAS_ICE 1
  35
  36 #define ELF_MACHINE     EM_ALPHA
  37
  38 #define ICACHE_LINE_SIZE 32
  39 #define DCACHE_LINE_SIZE 32
  40
  41 #define TARGET_PAGE_BITS 13
  42
  43 #ifdef CONFIG_USER_ONLY
  44 /* ??? The kernel likes to give addresses in high memory.  If the host has
  45    more virtual address space than the guest, this can lead to impossible
  46    allocations.  Honor the long-standing assumption that only kernel addrs
  47    are negative, but otherwise allow allocations anywhere.  This could lead
  48    to tricky emulation problems for programs doing tagged addressing, but
  49    that's far fewer than encounter the impossible allocation problem.  */
  50 #define TARGET_PHYS_ADDR_SPACE_BITS  63
  51 #define TARGET_VIRT_ADDR_SPACE_BITS  63
  52 #else
  53 /* ??? EV4 has 34 phys addr bits, EV5 has 40, EV6 has 44.  */
  54 #define TARGET_PHYS_ADDR_SPACE_BITS  44
  55 #define TARGET_VIRT_ADDR_SPACE_BITS  (30 + TARGET_PAGE_BITS)
  56 #endif
  57
  58 /* Alpha major type */
  59 enum {
  60     ALPHA_EV3  = 1,
  61     ALPHA_EV4  = 2,
  62     ALPHA_SIM  = 3,
  63     ALPHA_LCA  = 4,
  64     ALPHA_EV5  = 5, /* 21164 */
  65     ALPHA_EV45 = 6, /* 21064A */
  66     ALPHA_EV56 = 7, /* 21164A */
  67 };
  68
  69 /* EV4 minor type */
  70 enum {
  71     ALPHA_EV4_2 = 0,
  72     ALPHA_EV4_3 = 1,
  73 };
  74
  75 /* LCA minor type */
  76 enum {
  77     ALPHA_LCA_1 = 1, /* 21066 */
  78     ALPHA_LCA_2 = 2, /* 20166 */
  79     ALPHA_LCA_3 = 3, /* 21068 */
  80     ALPHA_LCA_4 = 4, /* 21068 */
  81     ALPHA_LCA_5 = 5, /* 21066A */
  82     ALPHA_LCA_6 = 6, /* 21068A */
  83 };
  84
  85 /* EV5 minor type */
  86 enum {
  87     ALPHA_EV5_1 = 1, /* Rev BA, CA */
  88     ALPHA_EV5_2 = 2, /* Rev DA, EA */
  89     ALPHA_EV5_3 = 3, /* Pass 3 */
  90     ALPHA_EV5_4 = 4, /* Pass 3.2 */
  91     ALPHA_EV5_5 = 5, /* Pass 4 */
  92 };
  93
  94 /* EV45 minor type */
  95 enum {
  96     ALPHA_EV45_1 = 1, /* Pass 1 */
  97     ALPHA_EV45_2 = 2, /* Pass 1.1 */
  98     ALPHA_EV45_3 = 3, /* Pass 2 */
  99 };
 100
 101 /* EV56 minor type */
 102 enum {
 103     ALPHA_EV56_1 = 1, /* Pass 1 */
 104     ALPHA_EV56_2 = 2, /* Pass 2 */
 105 };
 106
 107 enum {
 108     IMPLVER_2106x = 0, /* EV4, EV45 & LCA45 */
 109     IMPLVER_21164 = 1, /* EV5, EV56 & PCA45 */
 110     IMPLVER_21264 = 2, /* EV6, EV67 & EV68x */
 111     IMPLVER_21364 = 3, /* EV7 & EV79 */
 112 };
 113
 114 enum {
 115     AMASK_BWX      = 0x00000001,
 116     AMASK_FIX      = 0x00000002,
 117     AMASK_CIX      = 0x00000004,
 118     AMASK_MVI      = 0x00000100,
 119     AMASK_TRAP     = 0x00000200,
 120     AMASK_PREFETCH = 0x00001000,
 121 };
 122
 123 enum {
 124     VAX_ROUND_NORMAL = 0,
 125     VAX_ROUND_CHOPPED,
 126 };
 127
 128 enum {
 129     IEEE_ROUND_NORMAL = 0,
 130     IEEE_ROUND_DYNAMIC,
 131     IEEE_ROUND_PLUS,
 132     IEEE_ROUND_MINUS,
 133     IEEE_ROUND_CHOPPED,
 134 };
 135
 136 /* IEEE floating-point operations encoding */
 137 /* Trap mode */
 138 enum {
 139     FP_TRAP_I   = 0x0,
 140     FP_TRAP_U   = 0x1,
 141     FP_TRAP_S  = 0x4,
 142     FP_TRAP_SU  = 0x5,
 143     FP_TRAP_SUI = 0x7,
 144 };
 145
 146 /* Rounding mode */
 147 enum {
 148     FP_ROUND_CHOPPED = 0x0,
 149     FP_ROUND_MINUS   = 0x1,
 150     FP_ROUND_NORMAL  = 0x2,
 151     FP_ROUND_DYNAMIC = 0x3,
 152 };
 153
 154 /* FPCR bits */
 155 #define FPCR_SUM                (1ULL << 63)
 156 #define FPCR_INED               (1ULL << 62)
 157 #define FPCR_UNFD               (1ULL << 61)
 158 #define FPCR_UNDZ               (1ULL << 60)
 159 #define FPCR_DYN_SHIFT          58
 160 #define FPCR_DYN_CHOPPED        (0ULL << FPCR_DYN_SHIFT)
 161 #define FPCR_DYN_MINUS          (1ULL << FPCR_DYN_SHIFT)
 162 #define FPCR_DYN_NORMAL         (2ULL << FPCR_DYN_SHIFT)
 163 #define FPCR_DYN_PLUS           (3ULL << FPCR_DYN_SHIFT)
 164 #define FPCR_DYN_MASK           (3ULL << FPCR_DYN_SHIFT)
 165 #define FPCR_IOV                (1ULL << 57)
 166 #define FPCR_INE                (1ULL << 56)
 167 #define FPCR_UNF                (1ULL << 55)
 168 #define FPCR_OVF                (1ULL << 54)
 169 #define FPCR_DZE                (1ULL << 53)
 170 #define FPCR_INV                (1ULL << 52)
 171 #define FPCR_OVFD               (1ULL << 51)
 172 #define FPCR_DZED               (1ULL << 50)
 173 #define FPCR_INVD               (1ULL << 49)
 174 #define FPCR_DNZ                (1ULL << 48)
 175 #define FPCR_DNOD               (1ULL << 47)
 176 #define FPCR_STATUS_MASK        (FPCR_IOV | FPCR_INE | FPCR_UNF \
 177                                  | FPCR_OVF | FPCR_DZE | FPCR_INV)
 178
 179 /* The silly software trap enables implemented by the kernel emulation.
 180    These are more or less architecturally required, since the real hardware
 181    has read-as-zero bits in the FPCR when the features aren't implemented.
 182    For the purposes of QEMU, we pretend the FPCR can hold everything.  */
 183 #define SWCR_TRAP_ENABLE_INV    (1ULL << 1)
 184 #define SWCR_TRAP_ENABLE_DZE    (1ULL << 2)
 185 #define SWCR_TRAP_ENABLE_OVF    (1ULL << 3)
 186 #define SWCR_TRAP_ENABLE_UNF    (1ULL << 4)
 187 #define SWCR_TRAP_ENABLE_INE    (1ULL << 5)
 188 #define SWCR_TRAP_ENABLE_DNO    (1ULL << 6)
 189 #define SWCR_TRAP_ENABLE_MASK   ((1ULL << 7) - (1ULL << 1))
 190
 191 #define SWCR_MAP_DMZ            (1ULL << 12)
 192 #define SWCR_MAP_UMZ            (1ULL << 13)
 193 #define SWCR_MAP_MASK           (SWCR_MAP_DMZ | SWCR_MAP_UMZ)
 194
 195 #define SWCR_STATUS_INV         (1ULL << 17)
 196 #define SWCR_STATUS_DZE         (1ULL << 18)
 197 #define SWCR_STATUS_OVF         (1ULL << 19)
 198 #define SWCR_STATUS_UNF         (1ULL << 20)
 199 #define SWCR_STATUS_INE         (1ULL << 21)
 200 #define SWCR_STATUS_DNO         (1ULL << 22)
 201 #define SWCR_STATUS_MASK        ((1ULL << 23) - (1ULL << 17))
 202
 203 #define SWCR_MASK  (SWCR_TRAP_ENABLE_MASK | SWCR_MAP_MASK | SWCR_STATUS_MASK)
 204
 205 /* MMU modes definitions */
 206
 207 /* Alpha has 5 MMU modes: PALcode, kernel, executive, supervisor, and user.
 208    The Unix PALcode only exposes the kernel and user modes; presumably
 209    executive and supervisor are used by VMS.
 210
 211    PALcode itself uses physical mode for code and kernel mode for data;
 212    there are PALmode instructions that can access data via physical mode
 213    or via an os-installed "alternate mode", which is one of the 4 above.
 214
 215    QEMU does not currently properly distinguish between code/data when
 216    looking up addresses.  To avoid having to address this issue, our
 217    emulated PALcode will cheat and use the KSEG mapping for its code+data
 218    rather than physical addresses.
 219
 220    Moreover, we're only emulating Unix PALcode, and not attempting VMS.
 221
 222    All of which allows us to drop all but kernel and user modes.
 223    Elide the unused MMU modes to save space.  */
 224
 225 #define NB_MMU_MODES 2
 226
 227 #define MMU_MODE0_SUFFIX _kernel
 228 #define MMU_MODE1_SUFFIX _user
 229 #define MMU_KERNEL_IDX   0
 230 #define MMU_USER_IDX     1
 231
 232 typedef struct CPUAlphaState CPUAlphaState;
 233
 234 struct CPUAlphaState {
 235     uint64_t ir[31];
 236     float64 fir[31];
 237     uint64_t pc;
 238     uint64_t unique;
 239     uint64_t lock_addr;
 240     uint64_t lock_st_addr;
 241     uint64_t lock_value;
 242     float_status fp_status;
 243     /* The following fields make up the FPCR, but in FP_STATUS format.  */
 244     uint8_t fpcr_exc_status;
 245     uint8_t fpcr_exc_mask;
 246     uint8_t fpcr_dyn_round;
 247     uint8_t fpcr_flush_to_zero;
 248     uint8_t fpcr_dnod;
 249     uint8_t fpcr_undz;
 250
 251     /* The Internal Processor Registers.  Some of these we assume always
 252        exist for use in user-mode.  */
 253     uint8_t ps;
 254     uint8_t intr_flag;
 255     uint8_t pal_mode;
 256     uint8_t fen;
 257
 258     uint32_t pcc_ofs;
 259
 260     /* These pass data from the exception logic in the translator and
 261        helpers to the OS entry point.  This is used for both system
 262        emulation and user-mode.  */
 263     uint64_t trap_arg0;
 264     uint64_t trap_arg1;
 265     uint64_t trap_arg2;
 266
 267 #if !defined(CONFIG_USER_ONLY)
 268     /* The internal data required by our emulation of the Unix PALcode.  */
 269     uint64_t exc_addr;
 270     uint64_t palbr;
 271     uint64_t ptbr;
 272     uint64_t vptptr;
 273     uint64_t sysval;
 274     uint64_t usp;
 275     uint64_t shadow[8];
 276     uint64_t scratch[24];
 277 #endif
 278
 279     /* This alarm doesn't exist in real hardware; we wish it did.  */
 280     struct QEMUTimer *alarm_timer;
 281     uint64_t alarm_expire;
 282
 283     /* Those resources are used only in QEMU core */
 284     CPU_COMMON
 285
 286     int error_code;
 287
 288     uint32_t features;
 289     uint32_t amask;
 290     int implver;
 291 };
 292
 293 #define cpu_init cpu_alpha_init
 294 #define cpu_exec cpu_alpha_exec
 295 #define cpu_gen_code cpu_alpha_gen_code
 296 #define cpu_signal_handler cpu_alpha_signal_handler
 297
 298 #include "cpu-all.h"
 299 #include "cpu-qom.h"
 300
 301 enum {
 302     FEATURE_ASN    = 0x00000001,
 303     FEATURE_SPS    = 0x00000002,
 304     FEATURE_VIRBND = 0x00000004,
 305     FEATURE_TBCHK  = 0x00000008,
 306 };
 307
 308 enum {
 309     EXCP_RESET,
 310     EXCP_MCHK,
 311     EXCP_SMP_INTERRUPT,
 312     EXCP_CLK_INTERRUPT,
 313     EXCP_DEV_INTERRUPT,
 314     EXCP_MMFAULT,
 315     EXCP_UNALIGN,
 316     EXCP_OPCDEC,
 317     EXCP_ARITH,
 318     EXCP_FEN,
 319     EXCP_CALL_PAL,
 320     /* For Usermode emulation.  */
 321     EXCP_STL_C,
 322     EXCP_STQ_C,
 323 };
 324
 325 /* Alpha-specific interrupt pending bits.  */
 326 #define CPU_INTERRUPT_TIMER     CPU_INTERRUPT_TGT_EXT_0
 327 #define CPU_INTERRUPT_SMP       CPU_INTERRUPT_TGT_EXT_1
 328 #define CPU_INTERRUPT_MCHK      CPU_INTERRUPT_TGT_EXT_2
 329
 330 /* OSF/1 Page table bits.  */
 331 enum {
 332     PTE_VALID = 0x0001,
 333     PTE_FOR   = 0x0002,  /* used for page protection (fault on read) */
 334     PTE_FOW   = 0x0004,  /* used for page protection (fault on write) */
 335     PTE_FOE   = 0x0008,  /* used for page protection (fault on exec) */
 336     PTE_ASM   = 0x0010,
 337     PTE_KRE   = 0x0100,
 338     PTE_URE   = 0x0200,
 339     PTE_KWE   = 0x1000,
 340     PTE_UWE   = 0x2000
 341 };
 342
 343 /* Hardware interrupt (entInt) constants.  */
 344 enum {
 345     INT_K_IP,
 346     INT_K_CLK,
 347     INT_K_MCHK,
 348     INT_K_DEV,
 349     INT_K_PERF,
 350 };
 351
 352 /* Memory management (entMM) constants.  */
 353 enum {
 354     MM_K_TNV,
 355     MM_K_ACV,
 356     MM_K_FOR,
 357     MM_K_FOE,
 358     MM_K_FOW
 359 };
 360
 361 /* Arithmetic exception (entArith) constants.  */
 362 enum {
 363     EXC_M_SWC = 1,      /* Software completion */
 364     EXC_M_INV = 2,      /* Invalid operation */
 365     EXC_M_DZE = 4,      /* Division by zero */
 366     EXC_M_FOV = 8,      /* Overflow */
 367     EXC_M_UNF = 16,     /* Underflow */
 368     EXC_M_INE = 32,     /* Inexact result */
 369     EXC_M_IOV = 64      /* Integer Overflow */
 370 };
 371
 372 /* Processor status constants.  */
 373 enum {
 374     /* Low 3 bits are interrupt mask level.  */
 375     PS_INT_MASK = 7,
 376
 377     /* Bits 4 and 5 are the mmu mode.  The VMS PALcode uses all 4 modes;
 378        The Unix PALcode only uses bit 4.  */
 379     PS_USER_MODE = 8
 380 };
 381
 382 static inline int cpu_mmu_index(CPUAlphaState *env)
 383 {
 384     if (env->pal_mode) {
 385         return MMU_KERNEL_IDX;
 386     } else if (env->ps & PS_USER_MODE) {
 387         return MMU_USER_IDX;
 388     } else {
 389         return MMU_KERNEL_IDX;
 390     }
 391 }
 392
 393 enum {
 394     IR_V0   = 0,
 395     IR_T0   = 1,
 396     IR_T1   = 2,
 397     IR_T2   = 3,
 398     IR_T3   = 4,
 399     IR_T4   = 5,
 400     IR_T5   = 6,
 401     IR_T6   = 7,
 402     IR_T7   = 8,
 403     IR_S0   = 9,
 404     IR_S1   = 10,
 405     IR_S2   = 11,
 406     IR_S3   = 12,
 407     IR_S4   = 13,
 408     IR_S5   = 14,
 409     IR_S6   = 15,
 410     IR_FP   = IR_S6,
 411     IR_A0   = 16,
 412     IR_A1   = 17,
 413     IR_A2   = 18,
 414     IR_A3   = 19,
 415     IR_A4   = 20,
 416     IR_A5   = 21,
 417     IR_T8   = 22,
 418     IR_T9   = 23,
 419     IR_T10  = 24,
 420     IR_T11  = 25,
 421     IR_RA   = 26,
 422     IR_T12  = 27,
 423     IR_PV   = IR_T12,
 424     IR_AT   = 28,
 425     IR_GP   = 29,
 426     IR_SP   = 30,
 427     IR_ZERO = 31,
 428 };
 429
 430 CPUAlphaState * cpu_alpha_init (const char *cpu_model);
 431 int cpu_alpha_exec(CPUAlphaState *s);
 432 /* you can call this signal handler from your SIGBUS and SIGSEGV
 433    signal handlers to inform the virtual CPU of exceptions. non zero
 434    is returned if the signal was handled by the virtual CPU.  */
 435 int cpu_alpha_signal_handler(int host_signum, void *pinfo,
 436                              void *puc);
 437 int cpu_alpha_handle_mmu_fault (CPUAlphaState *env, uint64_t address, int rw,
 438                                 int mmu_idx);
 439 #define cpu_handle_mmu_fault cpu_alpha_handle_mmu_fault
 440 void do_interrupt (CPUAlphaState *env);
 441 void do_restore_state(CPUAlphaState *, uintptr_t retaddr);
 442 void QEMU_NORETURN dynamic_excp(CPUAlphaState *, uintptr_t, int, int);
 443 void QEMU_NORETURN arith_excp(CPUAlphaState *, uintptr_t, int, uint64_t);
 444
 445 uint64_t cpu_alpha_load_fpcr (CPUAlphaState *env);
 446 void cpu_alpha_store_fpcr (CPUAlphaState *env, uint64_t val);
 447 #ifndef CONFIG_USER_ONLY
 448 void swap_shadow_regs(CPUAlphaState *env);
 449 QEMU_NORETURN void cpu_unassigned_access(CPUAlphaState *env1,
 450                                          hwaddr addr, int is_write,
 451                                          int is_exec, int unused, int size);
 452 #endif
 453
 454 /* Bits in TB->FLAGS that control how translation is processed.  */
 455 enum {
 456     TB_FLAGS_PAL_MODE = 1,
 457     TB_FLAGS_FEN = 2,
 458     TB_FLAGS_USER_MODE = 8,
 459
 460     TB_FLAGS_AMASK_SHIFT = 4,
 461     TB_FLAGS_AMASK_BWX = AMASK_BWX << TB_FLAGS_AMASK_SHIFT,
 462     TB_FLAGS_AMASK_FIX = AMASK_FIX << TB_FLAGS_AMASK_SHIFT,
 463     TB_FLAGS_AMASK_CIX = AMASK_CIX << TB_FLAGS_AMASK_SHIFT,
 464     TB_FLAGS_AMASK_MVI = AMASK_MVI << TB_FLAGS_AMASK_SHIFT,
 465     TB_FLAGS_AMASK_TRAP = AMASK_TRAP << TB_FLAGS_AMASK_SHIFT,
 466     TB_FLAGS_AMASK_PREFETCH = AMASK_PREFETCH << TB_FLAGS_AMASK_SHIFT,
 467 };
 468
 469 static inline void cpu_get_tb_cpu_state(CPUAlphaState *env, target_ulong *pc,
 470                                         target_ulong *cs_base, int *pflags)
 471 {
 472     int flags = 0;
 473
 474     *pc = env->pc;
 475     *cs_base = 0;
 476
 477     if (env->pal_mode) {
 478         flags = TB_FLAGS_PAL_MODE;
 479     } else {
 480         flags = env->ps & PS_USER_MODE;
 481     }
 482     if (env->fen) {
 483         flags |= TB_FLAGS_FEN;
 484     }
 485     flags |= env->amask << TB_FLAGS_AMASK_SHIFT;
 486
 487     *pflags = flags;
 488 }
 489
 490 #if defined(CONFIG_USER_ONLY)
 491 static inline void cpu_clone_regs(CPUAlphaState *env, target_ulong newsp)
 492 {
 493     if (newsp) {
 494         env->ir[IR_SP] = newsp;
 495     }
 496     env->ir[IR_V0] = 0;
 497     env->ir[IR_A3] = 0;
 498 }
 499
 500 static inline void cpu_set_tls(CPUAlphaState *env, target_ulong newtls)
 501 {
 502     env->unique = newtls;
 503 }
 504 #endif
 505
 506 static inline bool cpu_has_work(CPUState *cpu)
 507 {
 508     CPUAlphaState *env = &ALPHA_CPU(cpu)->env;
 509
 510     /* Here we are checking to see if the CPU should wake up from HALT.
 511        We will have gotten into this state only for WTINT from PALmode.  */
 512     /* ??? I'm not sure how the IPL state works with WTINT to keep a CPU
 513        asleep even if (some) interrupts have been asserted.  For now,
 514        assume that if a CPU really wants to stay asleep, it will mask
 515        interrupts at the chipset level, which will prevent these bits
 516        from being set in the first place.  */
 517     return env->interrupt_request & (CPU_INTERRUPT_HARD
 518                                      | CPU_INTERRUPT_TIMER
 519                                      | CPU_INTERRUPT_SMP
 520                                      | CPU_INTERRUPT_MCHK);
 521 }
 522
 523 #include "exec-all.h"
 524
 525 static inline void cpu_pc_from_tb(CPUAlphaState *env, TranslationBlock *tb)
 526 {
 527     env->pc = tb->pc;
 528 }
 529
 530 #endif /* !defined (__CPU_ALPHA_H__) */