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