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