sim/mips/sim-main.h

   1 /* MIPS Simulator definition.
   2    Copyright (C) 1997 Free Software Foundation, Inc.
   3    Contributed by Cygnus Support.
   4
   5 This file is part of GDB, the GNU debugger.
   6
   7 This program is free software; you can redistribute it and/or modify
   8 it under the terms of the GNU General Public License as published by
   9 the Free Software Foundation; either version 2, or (at your option)
  10 any later version.
  11
  12 This program is distributed in the hope that it will be useful,
  13 but WITHOUT ANY WARRANTY; without even the implied warranty of
  14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15 GNU General Public License for more details.
  16
  17 You should have received a copy of the GNU General Public License along
  18 with this program; if not, write to the Free Software Foundation, Inc.,
  19 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.  */
  20
  21 #ifndef SIM_MAIN_H
  22 #define SIM_MAIN_H
  23
  24 /* This simulator doesn't cache the Current Instruction Address */
  25 /* #define SIM_ENGINE_HALT_HOOK(SD, LAST_CPU, CIA) */
  26 /* #define SIM_ENGINE_RESUME_HOOK(SD, LAST_CPU, CIA) */
  27
  28 #define SIM_HAVE_BIENDIAN
  29
  30
  31 /* hobble some common features for moment */
  32 #define WITH_WATCHPOINTS 1
  33 #define WITH_MODULO_MEMORY 1
  34
  35 #include "sim-basics.h"
  36
  37 typedef address_word sim_cia;
  38
  39 #if (WITH_IGEN)
  40 /* Get the number of instructions.  FIXME: must be a more elegant way
  41    of doing this.  */
  42 #include "itable.h"
  43 #define MAX_INSNS (nr_itable_entries)
  44 #define INSN_NAME(i) itable[(i)].name
  45 #endif
  46
  47 #include "sim-base.h"
  48
  49
  50 /* Depreciated macros and types for manipulating 64bit values.  Use
  51    ../common/sim-bits.h and ../common/sim-endian.h macros instead. */
  52
  53 typedef signed64 word64;
  54 typedef unsigned64 uword64;
  55
  56 #define WORD64LO(t)     (unsigned int)((t)&0xFFFFFFFF)
  57 #define WORD64HI(t)     (unsigned int)(((uword64)(t))>>32)
  58 #define SET64LO(t)      (((uword64)(t))&0xFFFFFFFF)
  59 #define SET64HI(t)      (((uword64)(t))<<32)
  60 #define WORD64(h,l)     ((word64)((SET64HI(h)|SET64LO(l))))
  61 #define UWORD64(h,l)     (SET64HI(h)|SET64LO(l))
  62
  63 /* Sign-extend the given value (e) as a value (b) bits long. We cannot
  64    assume the HI32bits of the operand are zero, so we must perform a
  65    mask to ensure we can use the simple subtraction to sign-extend. */
  66 #define SIGNEXTEND(e,b) \
  67  ((unsigned_word) \
  68   (((e) & ((uword64) 1 << ((b) - 1))) \
  69    ? (((e) & (((uword64) 1 << (b)) - 1)) - ((uword64)1 << (b))) \
  70    : ((e) & (((((uword64) 1 << ((b) - 1)) - 1) << 1) | 1))))
  71
  72 /* Check if a value will fit within a halfword: */
  73 #define NOTHALFWORDVALUE(v) ((((((uword64)(v)>>16) == 0) && !((v) & ((unsigned)1 << 15))) || (((((uword64)(v)>>32) == 0xFFFFFFFF) && ((((uword64)(v)>>16) & 0xFFFF) == 0xFFFF)) && ((v) & ((unsigned)1 << 15)))) ? (1 == 0) : (1 == 1))
  74
  75
  76
  77 /* Floating-point operations: */
  78
  79 #include "sim-fpu.h"
  80
  81 /* FPU registers must be one of the following types. All other values
  82    are reserved (and undefined). */
  83 typedef enum {
  84  fmt_single  = 0,
  85  fmt_double  = 1,
  86  fmt_word    = 4,
  87  fmt_long    = 5,
  88  /* The following are well outside the normal acceptable format
  89     range, and are used in the register status vector. */
  90  fmt_unknown       = 0x10000000,
  91  fmt_uninterpreted = 0x20000000,
  92  fmt_uninterpreted_32 = 0x40000000,
  93  fmt_uninterpreted_64 = 0x80000000,
  94 } FP_formats;
  95
  96 unsigned64 value_fpr PARAMS ((SIM_DESC sd, sim_cpu *cpu, address_word cia, int fpr, FP_formats));
  97 #define ValueFPR(FPR,FMT) value_fpr (SD, CPU, cia, (FPR), (FMT))
  98
  99 void store_fpr PARAMS ((SIM_DESC sd, sim_cpu *cpu, address_word cia, int fpr, FP_formats fmt, unsigned64 value));
 100 #define StoreFPR(FPR,FMT,VALUE) store_fpr (SD, CPU, cia, (FPR), (FMT), (VALUE))
 101
 102 int NaN PARAMS ((unsigned64 op, FP_formats fmt));
 103 int Infinity PARAMS ((unsigned64 op, FP_formats fmt));
 104 int Less PARAMS ((unsigned64 op1, unsigned64 op2, FP_formats fmt));
 105 int Equal PARAMS ((unsigned64 op1, unsigned64 op2, FP_formats fmt));
 106 unsigned64 AbsoluteValue PARAMS ((unsigned64 op, FP_formats fmt));
 107 unsigned64 Negate PARAMS ((unsigned64 op, FP_formats fmt));
 108 unsigned64 Add PARAMS ((unsigned64 op1, unsigned64 op2, FP_formats fmt));
 109 unsigned64 Sub PARAMS ((unsigned64 op1, unsigned64 op2, FP_formats fmt));
 110 unsigned64 Multiply PARAMS ((unsigned64 op1, unsigned64 op2, FP_formats fmt));
 111 unsigned64 Divide PARAMS ((unsigned64 op1, unsigned64 op2, FP_formats fmt));
 112 unsigned64 Recip PARAMS ((unsigned64 op, FP_formats fmt));
 113 unsigned64 SquareRoot PARAMS ((unsigned64 op, FP_formats fmt));
 114 unsigned64 Max PARAMS ((unsigned64 op1, unsigned64 op2, FP_formats fmt));
 115 unsigned64 Min PARAMS ((unsigned64 op1, unsigned64 op2, FP_formats fmt));
 116 unsigned64 convert PARAMS ((SIM_DESC sd, sim_cpu *cpu, address_word cia, int rm, unsigned64 op, FP_formats from, FP_formats to));
 117 #define Convert(rm,op,from,to) \
 118 convert (SD, CPU, cia, rm, op, from, to)
 119
 120 /* Macro to update FPSR condition-code field. This is complicated by
 121    the fact that there is a hole in the index range of the bits within
 122    the FCSR register. Also, the number of bits visible depends on the
 123    MIPS ISA version being supported. */
 124
 125 #define SETFCC(cc,v) {\
 126   int bit = ((cc == 0) ? 23 : (24 + (cc)));\
 127   FCSR = ((FCSR & ~(1 << bit)) | ((v) << bit));\
 128 }
 129 #define GETFCC(cc) (((((cc) == 0) ? (FCSR & (1 << 23)) : (FCSR & (1 << (24 + (cc))))) != 0) ? 1U : 0)
 130
 131 /* This should be the COC1 value at the start of the preceding
 132    instruction: */
 133 #define PREVCOC1() ((STATE & simPCOC1) ? 1 : 0)
 134
 135 #if 1
 136 #define SizeFGR() (WITH_TARGET_FLOATING_POINT_BITSIZE)
 137 #else
 138 /* They depend on the CPU being simulated */
 139 #define SizeFGR() ((WITH_TARGET_WORD_BITSIZE == 64 && ((SR & status_FR) == 1)) ? 64 : 32)
 140 #endif
 141
 142 /* Standard FCRS bits: */
 143 #define IR (0) /* Inexact Result */
 144 #define UF (1) /* UnderFlow */
 145 #define OF (2) /* OverFlow */
 146 #define DZ (3) /* Division by Zero */
 147 #define IO (4) /* Invalid Operation */
 148 #define UO (5) /* Unimplemented Operation */
 149
 150 /* Get masks for individual flags: */
 151 #if 1 /* SAFE version */
 152 #define FP_FLAGS(b)  (((unsigned)(b) < 5) ? (1 << ((b) + 2)) : 0)
 153 #define FP_ENABLE(b) (((unsigned)(b) < 5) ? (1 << ((b) + 7)) : 0)
 154 #define FP_CAUSE(b)  (((unsigned)(b) < 6) ? (1 << ((b) + 12)) : 0)
 155 #else
 156 #define FP_FLAGS(b)  (1 << ((b) + 2))
 157 #define FP_ENABLE(b) (1 << ((b) + 7))
 158 #define FP_CAUSE(b)  (1 << ((b) + 12))
 159 #endif
 160
 161 #define FP_FS         (1 << 24) /* MIPS III onwards : Flush to Zero */
 162
 163 #define FP_MASK_RM    (0x3)
 164 #define FP_SH_RM      (0)
 165 #define FP_RM_NEAREST (0) /* Round to nearest        (Round) */
 166 #define FP_RM_TOZERO  (1) /* Round to zero           (Trunc) */
 167 #define FP_RM_TOPINF  (2) /* Round to Plus infinity  (Ceil) */
 168 #define FP_RM_TOMINF  (3) /* Round to Minus infinity (Floor) */
 169 #define GETRM()       (int)((FCSR >> FP_SH_RM) & FP_MASK_RM)
 170
 171
 172
 173 /* Integer ALU operations: */
 174
 175 #include "sim-alu.h"
 176
 177 #define ALU32_END(ANS) \
 178   if (ALU32_HAD_OVERFLOW) \
 179     SignalExceptionIntegerOverflow (); \
 180   (ANS) = ALU32_OVERFLOW_RESULT
 181
 182
 183 #define ALU64_END(ANS) \
 184   if (ALU64_HAD_OVERFLOW) \
 185     SignalExceptionIntegerOverflow (); \
 186   (ANS) = ALU64_OVERFLOW_RESULT;
 187
 188
 189 /* start-sanitize-r5900 */
 190
 191 /* Figure 10-5 FPU Control/Status Register.
 192    Note: some of these bits are different to what is found in a
 193    standard MIPS manual. */
 194 enum {
 195   R5900_FCSR_C = BIT (23), /* OK */
 196   R5900_FCSR_I = BIT (17),
 197   R5900_FCSR_D = BIT (16),
 198   R5900_FCSR_O = BIT (15),
 199   R5900_FCSR_U = BIT (14),
 200   R5900_FCSR_CAUSE = MASK (16,14),
 201   R5900_FCSR_SI = BIT (6),
 202   R5900_FCSR_SD = BIT (5),
 203   R5900_FCSR_SO = BIT (4),
 204   R5900_FCSR_SU = BIT (3),
 205 };
 206
 207 typedef struct _sim_r5900_cpu {
 208
 209   /* The R5900 has 32 x 128bit general purpose registers.
 210      Fortunatly, the high 64 bits are only touched by multimedia (MMI)
 211      instructions.  The normal mips instructions just use the lower 64
 212      bits.  To avoid changing the older parts of the simulator to
 213      handle this weirdness, the high 64 bits of each register are kept
 214      in a separate array (registers1).  The high 64 bits of any
 215      register are by convention refered by adding a '1' to the end of
 216      the normal register's name.  So LO still refers to the low 64
 217      bits of the LO register, LO1 refers to the high 64 bits of that
 218      same register.  */
 219   signed_word gpr1[32];
 220 #define GPR1     ((CPU)->r5900.gpr1)
 221   signed_word lo1;
 222   signed_word hi1;
 223 #define LO1      ((CPU)->r5900.lo1)
 224 #define HI1      ((CPU)->r5900.hi1)
 225
 226   /* The R5900 defines a shift amount register, that controls the
 227      amount of certain shift instructions */
 228   unsigned_word sa;        /* the shift amount register */
 229 #define REGISTER_SA     (124) /* GET RID IF THIS! */
 230 #define SA ((CPU)->r5900.sa)
 231
 232   /* The R5900, in addition to the (almost) standard floating point
 233      registers, defines a 32 bit accumulator.  This is used in
 234      multiply/accumulate style instructions */
 235   fp_word acc; /* floating-point accumulator */
 236 #define ACC ((CPU)->r5900.acc)
 237
 238   /* See comments below about needing to count cycles between updating
 239      and setting HI/LO registers */
 240   int hi1access;
 241   int lo1access;
 242 #define HI1ACCESS ((CPU)->r5900.hi1access)
 243 #define LO1ACCESS ((CPU)->r5900.lo1access)
 244 #if 0
 245 #define CHECKHILO(s) {\
 246   if ((HIACCESS != 0) || (LOACCESS != 0) || (HI1ACCESS != 0) || (LO1ACCESS != 0))\
 247     sim_io_eprintf(sd,"%s over-writing HI and LO registers values (PC = 0x%s HLPC = 0x%s)\n",(s),pr_addr(PC),pr_addr(HLPC));\
 248 }
 249 #endif
 250
 251 } sim_r5900_cpu;
 252
 253 #define BYTES_IN_MMI_REGS       (sizeof(signed_word) + sizeof(signed_word))
 254 #define HALFWORDS_IN_MMI_REGS   (BYTES_IN_MMI_REGS/2)
 255 #define WORDS_IN_MMI_REGS       (BYTES_IN_MMI_REGS/4)
 256 #define DOUBLEWORDS_IN_MMI_REGS (BYTES_IN_MMI_REGS/8)
 257
 258 #define BYTES_IN_MIPS_REGS       (sizeof(signed_word))
 259 #define HALFWORDS_IN_MIPS_REGS   (BYTES_IN_MIPS_REGS/2)
 260 #define WORDS_IN_MIPS_REGS       (BYTES_IN_MIPS_REGS/4)
 261 #define DOUBLEWORDS_IN_MIPS_REGS (BYTES_IN_MIPS_REGS/8)
 262
 263 /* SUB_REG_FETCH - return as lvalue some sub-part of a "register"
 264    T  - type of the sub part
 265    TC - # of T's in the mips part of the "register"
 266    I  - index (from 0) of desired sub part
 267    A  - low part of "register"
 268    A1 - high part of register
 269 */
 270 #define SUB_REG_FETCH(T,TC,A,A1,I) \
 271 (*(((I) < (TC) ? (T*)(A) : (T*)(A1)) \
 272    + (CURRENT_HOST_BYTE_ORDER == BIG_ENDIAN \
 273       ? ((TC) - 1 - (I) % (TC)) \
 274       : ((I) % (TC)) \
 275       ) \
 276    ) \
 277  )
 278
 279 /*
 280 GPR_<type>(R,I) - return, as lvalue, the I'th <type> of general register R
 281             where <type> has two letters:
 282                   1 is S=signed or U=unsigned
 283                   2 is B=byte H=halfword W=word D=doubleword
 284 */
 285
 286 #define SUB_REG_SB(A,A1,I) SUB_REG_FETCH(signed8,  BYTES_IN_MIPS_REGS,       A, A1, I)
 287 #define SUB_REG_SH(A,A1,I) SUB_REG_FETCH(signed16, HALFWORDS_IN_MIPS_REGS,   A, A1, I)
 288 #define SUB_REG_SW(A,A1,I) SUB_REG_FETCH(signed32, WORDS_IN_MIPS_REGS,       A, A1, I)
 289 #define SUB_REG_SD(A,A1,I) SUB_REG_FETCH(signed64, DOUBLEWORDS_IN_MIPS_REGS, A, A1, I)
 290
 291 #define SUB_REG_UB(A,A1,I) SUB_REG_FETCH(unsigned8,  BYTES_IN_MIPS_REGS,       A, A1, I)
 292 #define SUB_REG_UH(A,A1,I) SUB_REG_FETCH(unsigned16, HALFWORDS_IN_MIPS_REGS,   A, A1, I)
 293 #define SUB_REG_UW(A,A1,I) SUB_REG_FETCH(unsigned32, WORDS_IN_MIPS_REGS,       A, A1, I)
 294 #define SUB_REG_UD(A,A1,I) SUB_REG_FETCH(unsigned64, DOUBLEWORDS_IN_MIPS_REGS, A, A1, I)
 295
 296 #define GPR_SB(R,I) SUB_REG_SB(&GPR[R], &GPR1[R], I)
 297 #define GPR_SH(R,I) SUB_REG_SH(&GPR[R], &GPR1[R], I)
 298 #define GPR_SW(R,I) SUB_REG_SW(&GPR[R], &GPR1[R], I)
 299 #define GPR_SD(R,I) SUB_REG_SD(&GPR[R], &GPR1[R], I)
 300
 301 #define GPR_UB(R,I) SUB_REG_UB(&GPR[R], &GPR1[R], I)
 302 #define GPR_UH(R,I) SUB_REG_UH(&GPR[R], &GPR1[R], I)
 303 #define GPR_UW(R,I) SUB_REG_UW(&GPR[R], &GPR1[R], I)
 304 #define GPR_UD(R,I) SUB_REG_UD(&GPR[R], &GPR1[R], I)
 305
 306
 307 #define RS_SB(I) SUB_REG_SB(&rs_reg, &rs_reg1, I)
 308 #define RS_SH(I) SUB_REG_SH(&rs_reg, &rs_reg1, I)
 309 #define RS_SW(I) SUB_REG_SW(&rs_reg, &rs_reg1, I)
 310 #define RS_SD(I) SUB_REG_SD(&rs_reg, &rs_reg1, I)
 311
 312 #define RS_UB(I) SUB_REG_UB(&rs_reg, &rs_reg1, I)
 313 #define RS_UH(I) SUB_REG_UH(&rs_reg, &rs_reg1, I)
 314 #define RS_UW(I) SUB_REG_UW(&rs_reg, &rs_reg1, I)
 315 #define RS_UD(I) SUB_REG_UD(&rs_reg, &rs_reg1, I)
 316
 317 #define RT_SB(I) SUB_REG_SB(&rt_reg, &rt_reg1, I)
 318 #define RT_SH(I) SUB_REG_SH(&rt_reg, &rt_reg1, I)
 319 #define RT_SW(I) SUB_REG_SW(&rt_reg, &rt_reg1, I)
 320 #define RT_SD(I) SUB_REG_SD(&rt_reg, &rt_reg1, I)
 321
 322 #define RT_UB(I) SUB_REG_UB(&rt_reg, &rt_reg1, I)
 323 #define RT_UH(I) SUB_REG_UH(&rt_reg, &rt_reg1, I)
 324 #define RT_UW(I) SUB_REG_UW(&rt_reg, &rt_reg1, I)
 325 #define RT_UD(I) SUB_REG_UD(&rt_reg, &rt_reg1, I)
 326
 327
 328
 329 #define LO_SB(I) SUB_REG_SB(&LO, &LO1, I)
 330 #define LO_SH(I) SUB_REG_SH(&LO, &LO1, I)
 331 #define LO_SW(I) SUB_REG_SW(&LO, &LO1, I)
 332 #define LO_SD(I) SUB_REG_SD(&LO, &LO1, I)
 333
 334 #define LO_UB(I) SUB_REG_UB(&LO, &LO1, I)
 335 #define LO_UH(I) SUB_REG_UH(&LO, &LO1, I)
 336 #define LO_UW(I) SUB_REG_UW(&LO, &LO1, I)
 337 #define LO_UD(I) SUB_REG_UD(&LO, &LO1, I)
 338
 339 #define HI_SB(I) SUB_REG_SB(&HI, &HI1, I)
 340 #define HI_SH(I) SUB_REG_SH(&HI, &HI1, I)
 341 #define HI_SW(I) SUB_REG_SW(&HI, &HI1, I)
 342 #define HI_SD(I) SUB_REG_SD(&HI, &HI1, I)
 343
 344 #define HI_UB(I) SUB_REG_UB(&HI, &HI1, I)
 345 #define HI_UH(I) SUB_REG_UH(&HI, &HI1, I)
 346 #define HI_UW(I) SUB_REG_UW(&HI, &HI1, I)
 347 #define HI_UD(I) SUB_REG_UD(&HI, &HI1, I)
 348
 349 /* end-sanitize-r5900 */
 350
 351
 352
 353 /* The following is probably not used for MIPS IV onwards: */
 354 /* Slots for delayed register updates. For the moment we just have a
 355    fixed number of slots (rather than a more generic, dynamic
 356    system). This keeps the simulator fast. However, we only allow
 357    for the register update to be delayed for a single instruction
 358    cycle. */
 359 #define PSLOTS (8) /* Maximum number of instruction cycles */
 360
 361 typedef struct _pending_write_queue {
 362   int in;
 363   int out;
 364   int total;
 365   int slot_delay[PSLOTS];
 366   int slot_size[PSLOTS];
 367   int slot_bit[PSLOTS];
 368   void *slot_dest[PSLOTS];
 369   unsigned64 slot_value[PSLOTS];
 370 } pending_write_queue;
 371
 372 #ifndef PENDING_TRACE
 373 #define PENDING_TRACE 0
 374 #endif
 375 #define PENDING_IN ((CPU)->pending.in)
 376 #define PENDING_OUT ((CPU)->pending.out)
 377 #define PENDING_TOTAL ((CPU)->pending.total)
 378 #define PENDING_SLOT_SIZE ((CPU)->pending.slot_size)
 379 #define PENDING_SLOT_BIT ((CPU)->pending.slot_size)
 380 #define PENDING_SLOT_DELAY ((CPU)->pending.slot_delay)
 381 #define PENDING_SLOT_DEST ((CPU)->pending.slot_dest)
 382 #define PENDING_SLOT_VALUE ((CPU)->pending.slot_value)
 383
 384 /* Invalidate the pending write queue, all pending writes are
 385    discarded. */
 386
 387 #define PENDING_INVALIDATE() \
 388 memset (&(CPU)->pending, 0, sizeof ((CPU)->pending))
 389
 390 /* Schedule a write to DEST for N cycles time.  For 64 bit
 391    destinations, schedule two writes.  For floating point registers,
 392    the caller should schedule a write to both the dest register and
 393    the FPR_STATE register.  When BIT is non-negative, only BIT of DEST
 394    is updated. */
 395
 396 #define PENDING_SCHED(DEST,VAL,DELAY,BIT)                               \
 397   do {                                                                  \
 398     if (PENDING_SLOT_DEST[PENDING_IN] != NULL)                          \
 399       sim_engine_abort (SD, CPU, cia,                                   \
 400                         "PENDING_SCHED - buffer overflow\n");           \
 401     if (PENDING_TRACE)                                                  \
 402       sim_io_printf (SD, "PENDING_SCHED - dest 0x%lx, val 0x%lx, pending_in %d, pending_out %d, pending_total %d\n", (unsigned long) (DEST), (unsigned long) (VAL), PENDING_IN, PENDING_OUT, PENDING_TOTAL); \
 403     PENDING_SLOT_DELAY[PENDING_IN] = (DELAY) + 1;                       \
 404     PENDING_SLOT_DEST[PENDING_IN] = &(DEST);                            \
 405     PENDING_SLOT_VALUE[PENDING_IN] = (VAL);                             \
 406     PENDING_SLOT_SIZE[PENDING_IN] = sizeof (DEST);                      \
 407     PENDING_SLOT_BIT[PENDING_IN] = (BIT);                               \
 408   } while (0)
 409
 410 #define PENDING_WRITE(DEST,VAL,DELAY) PENDING_SCHED(DEST,VAL,DELAY,-1)
 411 #define PENDING_BIT(DEST,VAL,DELAY,BIT) PENDING_SCHED(DEST,VAL,DELAY,BIT)
 412
 413 #define PENDING_TICK() pending_tick (SD, CPU, cia)
 414
 415 #define PENDING_FLUSH() abort () /* think about this one */
 416 #define PENDING_FP() abort () /* think about this one */
 417
 418 /* For backward compatibility */
 419 #define PENDING_FILL(R,VAL)                                             \
 420 {                                                                       \
 421   if ((R) >= FGRIDX && (R) < FGRIDX + NR_FGR)                           \
 422     PENDING_SCHED(FGR[(R) - FGRIDX], VAL, 2, -1);                       \
 423   else                                                                  \
 424     PENDING_SCHED(GPR[(R)], VAL, 2, -1);                                \
 425 }
 426
 427
 428
 429 struct _sim_cpu {
 430
 431
 432   /* The following are internal simulator state variables: */
 433 #define CIA_GET(CPU) ((CPU)->registers[PCIDX] + 0)
 434 #define CIA_SET(CPU,CIA) ((CPU)->registers[PCIDX] = (CIA))
 435   address_word dspc;  /* delay-slot PC */
 436 #define DSPC ((CPU)->dspc)
 437
 438   /* Issue a delay slot instruction immediatly by re-calling
 439      idecode_issue */
 440 #define DELAY_SLOT(TARGET) \
 441   do { \
 442     address_word target = (TARGET); \
 443     instruction_word delay_insn; \
 444     sim_events_slip (SD, 1); \
 445     CIA = CIA + 4; /* NOTE not mips16 */ \
 446     STATE |= simDELAYSLOT; \
 447     delay_insn = IMEM32 (CIA); /* NOTE not mips16 */ \
 448     idecode_issue (CPU_, delay_insn, (CIA)); \
 449     STATE &= ~simDELAYSLOT; \
 450     NIA = target; \
 451   } while (0)
 452 #define NULLIFY_NEXT_INSTRUCTION() \
 453   do { \
 454     sim_events_slip (SD, 1); \
 455     dotrace (SD, CPU, tracefh, 2, NIA, 4, "load instruction"); \
 456     NIA = CIA + 8; \
 457   } while (0)
 458
 459
 460
 461   /* State of the simulator */
 462   unsigned int state;
 463   unsigned int dsstate;
 464 #define STATE ((CPU)->state)
 465 #define DSSTATE ((CPU)->dsstate)
 466
 467 /* Flags in the "state" variable: */
 468 #define simHALTEX       (1 << 2)  /* 0 = run; 1 = halt on exception */
 469 #define simHALTIN       (1 << 3)  /* 0 = run; 1 = halt on interrupt */
 470 #define simTRACE        (1 << 8)  /* 0 = do nothing; 1 = trace address activity */
 471 #define simPCOC0        (1 << 17) /* COC[1] from current */
 472 #define simPCOC1        (1 << 18) /* COC[1] from previous */
 473 #define simDELAYSLOT    (1 << 24) /* 0 = do nothing; 1 = delay slot entry exists */
 474 #define simSKIPNEXT     (1 << 25) /* 0 = do nothing; 1 = skip instruction */
 475 #define simSIGINT       (1 << 28)  /* 0 = do nothing; 1 = SIGINT has occured */
 476 #define simJALDELAYSLOT (1 << 29) /* 1 = in jal delay slot */
 477
 478 #define ENGINE_ISSUE_PREFIX_HOOK() \
 479   { \
 480     /* Perform any pending writes */ \
 481     PENDING_TICK(); \
 482     /* Set previous flag, depending on current: */ \
 483     if (STATE & simPCOC0) \
 484      STATE |= simPCOC1; \
 485     else \
 486      STATE &= ~simPCOC1; \
 487     /* and update the current value: */ \
 488     if (GETFCC(0)) \
 489      STATE |= simPCOC0; \
 490     else \
 491      STATE &= ~simPCOC0; \
 492   }
 493
 494
 495 /* This is nasty, since we have to rely on matching the register
 496    numbers used by GDB. Unfortunately, depending on the MIPS target
 497    GDB uses different register numbers. We cannot just include the
 498    relevant "gdb/tm.h" link, since GDB may not be configured before
 499    the sim world, and also the GDB header file requires too much other
 500    state. */
 501
 502 #ifndef TM_MIPS_H
 503 #define LAST_EMBED_REGNUM (89)
 504 #define NUM_REGS (LAST_EMBED_REGNUM + 1)
 505 /* start-sanitize-r5900 */
 506 #undef NUM_REGS
 507 #define NUM_REGS (128)
 508 /* end-sanitize-r5900 */
 509 #endif
 510
 511 /* start-sanitize-sky */
 512 #ifdef TARGET_SKY
 513 #ifndef TM_TXVU_H
 514
 515 /* Number of machine registers */
 516 #define NUM_VU_REGS     153
 517 #define NUM_VU_INTEGER_REGS 16
 518
 519 #define FIRST_VEC_REG   25
 520 #define NUM_R5900_REGS  128
 521
 522 #undef NUM_REGS
 523 #define NUM_REGS (NUM_R5900_REGS + 2*(NUM_VU_REGS))
 524 #endif /* no tm-txvu.h */
 525 #endif
 526 /* end-sanitize-sky */
 527
 528 /* To keep this default simulator simple, and fast, we use a direct
 529    vector of registers. The internal simulator engine then uses
 530    manifests to access the correct slot. */
 531
 532   unsigned_word registers[LAST_EMBED_REGNUM + 1];
 533   int register_widths[NUM_REGS];
 534 #define REGISTERS       ((CPU)->registers)
 535
 536 #define GPR     (&REGISTERS[0])
 537 #define GPR_SET(N,VAL) (REGISTERS[(N)] = (VAL))
 538
 539   /* While space is allocated for the floating point registers in the
 540      main registers array, they are stored separatly.  This is because
 541      their size may not necessarily match the size of either the
 542      general-purpose or system specific registers */
 543 #define NR_FGR  (32)
 544 #define FGRIDX  (38)
 545   fp_word fgr[NR_FGR];
 546 #define FGR     ((CPU)->fgr)
 547
 548 #define LO      (REGISTERS[33])
 549 #define HI      (REGISTERS[34])
 550 #define PCIDX   37
 551 #define PC      (REGISTERS[PCIDX])
 552 #define CAUSE   (REGISTERS[36])
 553 #define SRIDX   (32)
 554 #define SR      (REGISTERS[SRIDX])      /* CPU status register */
 555 #define FCR0IDX  (71)
 556 #define FCR0    (REGISTERS[FCR0IDX])    /* really a 32bit register */
 557 #define FCR31IDX (70)
 558 #define FCR31   (REGISTERS[FCR31IDX])   /* really a 32bit register */
 559 #define FCSR    (FCR31)
 560 #define Debug   (REGISTERS[86])
 561 #define DEPC    (REGISTERS[87])
 562 #define EPC     (REGISTERS[88])
 563 #define COCIDX  (LAST_EMBED_REGNUM + 2) /* special case : outside the normal range */
 564
 565   unsigned_word c0_config_reg;
 566 #define C0_CONFIG ((CPU)->c0_config_reg)
 567
 568 /* The following are pseudonyms for standard registers */
 569 #define ZERO    (REGISTERS[0])
 570 #define V0      (REGISTERS[2])
 571 #define A0      (REGISTERS[4])
 572 #define A1      (REGISTERS[5])
 573 #define A2      (REGISTERS[6])
 574 #define A3      (REGISTERS[7])
 575 #define SP      (REGISTERS[29])
 576 #define RA      (REGISTERS[31])
 577
 578   /* Keep the current format state for each register: */
 579   FP_formats fpr_state[32];
 580 #define FPR_STATE ((CPU)->fpr_state)
 581
 582   pending_write_queue pending;
 583
 584   /* LLBIT = Load-Linked bit. A bit of "virtual" state used by atomic
 585      read-write instructions. It is set when a linked load occurs. It
 586      is tested and cleared by the conditional store. It is cleared
 587      (during other CPU operations) when a store to the location would
 588      no longer be atomic. In particular, it is cleared by exception
 589      return instructions. */
 590   int llbit;
 591 #define LLBIT ((CPU)->llbit)
 592
 593
 594 /* The HIACCESS and LOACCESS counts are used to ensure that
 595    corruptions caused by using the HI or LO register to close to a
 596    following operation are spotted. */
 597
 598   int hiaccess;
 599   int loaccess;
 600 #define HIACCESS ((CPU)->hiaccess)
 601 #define LOACCESS ((CPU)->loaccess)
 602
 603 #if 0
 604   unsigned_word HLPC;
 605   /* If either of the preceding two instructions have accessed the HI
 606      or LO registers, then the values they see should be
 607      undefined. However, to keep the simulator world simple, we just
 608      let them use the value read and raise a warning to notify the
 609      user: */
 610 #define CHECKHILO(s) {\
 611   if ((HIACCESS != 0) || (LOACCESS != 0)) \
 612     sim_io_eprintf(sd,"%s over-writing HI and LO registers values (PC = 0x%s HLPC = 0x%s)\n",(s),pr_addr(PC),pr_addr(HLPC));\
 613 }
 614 #endif
 615
 616 #if !defined CHECKHILO
 617   /* The 4300 and a few other processors have interlocks on hi/lo
 618      register reads, and hence do not have this problem.  To avoid
 619      spurious warnings, we just disable this always.  */
 620 #define CHECKHILO(s)
 621 #endif
 622
 623   /* start-sanitize-r5900 */
 624   sim_r5900_cpu r5900;
 625
 626   /* end-sanitize-r5900 */
 627   /* start-sanitize-vr5400 */
 628
 629   /* The MDMX ISA has a very very large accumulator */
 630   unsigned8 acc[3 * 8];
 631   /* end-sanitize-vr5400 */
 632
 633   sim_cpu_base base;
 634 };
 635
 636
 637 /* MIPS specific simulator watch config */
 638
 639 void watch_options_install PARAMS ((SIM_DESC sd));
 640
 641 struct swatch {
 642   sim_event *pc;
 643   sim_event *clock;
 644   sim_event *cycles;
 645 };
 646
 647
 648 /* FIXME: At present much of the simulator is still static */
 649 struct sim_state {
 650
 651   struct swatch watch;
 652
 653   sim_cpu cpu[MAX_NR_PROCESSORS];
 654 #if (WITH_SMP)
 655 #define STATE_CPU(sd,n) (&(sd)->cpu[n])
 656 #else
 657 #define STATE_CPU(sd,n) (&(sd)->cpu[0])
 658 #endif
 659
 660   sim_state_base base;
 661 };
 662
 663
 664
 665 /* Status information: */
 666
 667 /* TODO : these should be the bitmasks for these bits within the
 668    status register. At the moment the following are VR4300
 669    bit-positions: */
 670 #define status_KSU_mask  (0x3)          /* mask for KSU bits */
 671 #define status_KSU_shift (3)            /* shift for field */
 672 #define ksu_kernel       (0x0)
 673 #define ksu_supervisor   (0x1)
 674 #define ksu_user         (0x2)
 675 #define ksu_unknown      (0x3)
 676
 677 #define status_IE        (1 <<  0)      /* Interrupt enable */
 678 #define status_EXL       (1 <<  1)      /* Exception level */
 679 #define status_RE        (1 << 25)      /* Reverse Endian in user mode */
 680 #define status_FR        (1 << 26)      /* enables MIPS III additional FP registers */
 681 #define status_SR        (1 << 20)      /* soft reset or NMI */
 682 #define status_BEV       (1 << 22)      /* Location of general exception vectors */
 683 #define status_TS        (1 << 21)      /* TLB shutdown has occurred */
 684 #define status_ERL       (1 <<  2)      /* Error level */
 685 #define status_RP        (1 << 27)      /* Reduced Power mode */
 686 /* begin-sanitize-r5900 */
 687 #define status_CU0       (1 << 28)      /* COP0 usable */
 688 #define status_CU1       (1 << 29)      /* COP1 usable */
 689 #define status_CU2       (1 << 30)      /* COP2 usable */
 690 /* begin-sanitize-r5900 */
 691
 692 #define cause_BD        ((unsigned)1 << 31)     /* Exception in branch delay slot */
 693
 694 /* NOTE: We keep the following status flags as bit values (1 for true,
 695    0 for false). This allows them to be used in binary boolean
 696    operations without worrying about what exactly the non-zero true
 697    value is. */
 698
 699 /* UserMode */
 700 #define UserMode        ((((SR & status_KSU_mask) >> status_KSU_shift) == ksu_user) ? 1 : 0)
 701
 702 /* BigEndianMem */
 703 /* Hardware configuration. Affects endianness of LoadMemory and
 704    StoreMemory and the endianness of Kernel and Supervisor mode
 705    execution. The value is 0 for little-endian; 1 for big-endian. */
 706 #define BigEndianMem    (CURRENT_TARGET_BYTE_ORDER == BIG_ENDIAN)
 707 /*(state & simBE) ? 1 : 0)*/
 708
 709 /* ReverseEndian */
 710 /* This mode is selected if in User mode with the RE bit being set in
 711    SR (Status Register). It reverses the endianness of load and store
 712    instructions. */
 713 #define ReverseEndian   (((SR & status_RE) && UserMode) ? 1 : 0)
 714
 715 /* BigEndianCPU */
 716 /* The endianness for load and store instructions (0=little;1=big). In
 717    User mode this endianness may be switched by setting the state_RE
 718    bit in the SR register. Thus, BigEndianCPU may be computed as
 719    (BigEndianMem EOR ReverseEndian). */
 720 #define BigEndianCPU    (BigEndianMem ^ ReverseEndian) /* Already bits */
 721
 722
 723
 724 /* Exceptions: */
 725
 726 /* NOTE: These numbers depend on the processor architecture being
 727    simulated: */
 728 #define Interrupt               (0)
 729 #define TLBModification         (1)
 730 #define TLBLoad                 (2)
 731 #define TLBStore                (3)
 732 #define AddressLoad             (4)
 733 #define AddressStore            (5)
 734 #define InstructionFetch        (6)
 735 #define DataReference           (7)
 736 #define SystemCall              (8)
 737 #define BreakPoint              (9)
 738 #define ReservedInstruction     (10)
 739 #define CoProcessorUnusable     (11)
 740 #define IntegerOverflow         (12)    /* Arithmetic overflow (IDT monitor raises SIGFPE) */
 741 #define Trap                    (13)
 742 #define FPE                     (15)
 743 #define DebugBreakPoint         (16)
 744 #define Watch                   (23)
 745
 746 /* The following exception code is actually private to the simulator
 747    world. It is *NOT* a processor feature, and is used to signal
 748    run-time errors in the simulator. */
 749 #define SimulatorFault      (0xFFFFFFFF)
 750
 751 void signal_exception (SIM_DESC sd, sim_cpu *cpu, address_word cia, int exception, ...);
 752 #define SignalException(exc,instruction)     signal_exception (SD, CPU, cia, (exc), (instruction))
 753 #define SignalExceptionInterrupt()           signal_exception (SD, CPU, NULL_CIA, Interrupt)
 754 #define SignalExceptionInstructionFetch()    signal_exception (SD, CPU, cia, InstructionFetch)
 755 #define SignalExceptionAddressStore()        signal_exception (SD, CPU, cia, AddressStore)
 756 #define SignalExceptionAddressLoad()         signal_exception (SD, CPU, cia, AddressLoad)
 757 #define SignalExceptionSimulatorFault(buf)   signal_exception (SD, CPU, cia, SimulatorFault, buf)
 758 #define SignalExceptionFPE()                 signal_exception (SD, CPU, cia, FPE)
 759 #define SignalExceptionIntegerOverflow()     signal_exception (SD, CPU, cia, IntegerOverflow)
 760 #define SignalExceptionCoProcessorUnusable() signal_exception (SD, CPU, cia, CoProcessorUnusable)
 761
 762
 763 /* Co-processor accesses */
 764
 765 void cop_lw  PARAMS ((SIM_DESC sd, sim_cpu *cpu, address_word cia, int coproc_num, int coproc_reg, unsigned int memword));
 766 void cop_ld  PARAMS ((SIM_DESC sd, sim_cpu *cpu, address_word cia, int coproc_num, int coproc_reg, uword64 memword));
 767 unsigned int cop_sw PARAMS ((SIM_DESC sd, sim_cpu *cpu, address_word cia, int coproc_num, int coproc_reg));
 768 uword64 cop_sd PARAMS ((SIM_DESC sd, sim_cpu *cpu, address_word cia, int coproc_num, int coproc_reg));
 769
 770 #define COP_LW(coproc_num,coproc_reg,memword) \
 771 cop_lw (SD, CPU, cia, coproc_num, coproc_reg, memword)
 772 #define COP_LD(coproc_num,coproc_reg,memword) \
 773 cop_ld (SD, CPU, cia, coproc_num, coproc_reg, memword)
 774 #define COP_SW(coproc_num,coproc_reg) \
 775 cop_sw (SD, CPU, cia, coproc_num, coproc_reg)
 776 #define COP_SD(coproc_num,coproc_reg) \
 777 cop_sd (SD, CPU, cia, coproc_num, coproc_reg)
 778
 779 /* start-sanitize-sky */
 780 void cop_lq  PARAMS ((SIM_DESC sd, sim_cpu *cpu, address_word cia, int coproc_num, int coproc_reg, unsigned128 memword));
 781 unsigned128 cop_sq PARAMS ((SIM_DESC sd, sim_cpu *cpu, address_word cia, int coproc_num, int coproc_reg));
 782 #define COP_LQ(coproc_num,coproc_reg,memword) \
 783 cop_lq (SD, CPU, cia, coproc_num, coproc_reg, memword)
 784 #define COP_SQ(coproc_num,coproc_reg) \
 785 cop_sq (SD, CPU, cia, coproc_num, coproc_reg)
 786 /* end-sanitize-sky */
 787
 788 void decode_coproc PARAMS ((SIM_DESC sd, sim_cpu *cpu, address_word cia, unsigned int instruction));
 789 #define DecodeCoproc(instruction) \
 790 decode_coproc (SD, CPU, cia, (instruction))
 791
 792
 793
 794 /* Memory accesses */
 795
 796 /* The following are generic to all versions of the MIPS architecture
 797    to date: */
 798
 799 /* Memory Access Types (for CCA): */
 800 #define Uncached                (0)
 801 #define CachedNoncoherent       (1)
 802 #define CachedCoherent          (2)
 803 #define Cached                  (3)
 804
 805 #define isINSTRUCTION   (1 == 0) /* FALSE */
 806 #define isDATA          (1 == 1) /* TRUE */
 807 #define isLOAD          (1 == 0) /* FALSE */
 808 #define isSTORE         (1 == 1) /* TRUE */
 809 #define isREAL          (1 == 0) /* FALSE */
 810 #define isRAW           (1 == 1) /* TRUE */
 811 /* The parameter HOST (isTARGET / isHOST) is ignored */
 812 #define isTARGET        (1 == 0) /* FALSE */
 813 /* #define isHOST          (1 == 1) TRUE */
 814
 815 /* The "AccessLength" specifications for Loads and Stores. NOTE: This
 816    is the number of bytes minus 1. */
 817 #define AccessLength_BYTE       (0)
 818 #define AccessLength_HALFWORD   (1)
 819 #define AccessLength_TRIPLEBYTE (2)
 820 #define AccessLength_WORD       (3)
 821 #define AccessLength_QUINTIBYTE (4)
 822 #define AccessLength_SEXTIBYTE  (5)
 823 #define AccessLength_SEPTIBYTE  (6)
 824 #define AccessLength_DOUBLEWORD (7)
 825 #define AccessLength_QUADWORD   (15)
 826
 827 int address_translation PARAMS ((SIM_DESC sd, sim_cpu *, address_word cia, address_word vAddr, int IorD, int LorS, address_word *pAddr, int *CCA, int raw));
 828 #define AddressTranslation(vAddr,IorD,LorS,pAddr,CCA,host,raw) \
 829 address_translation (SD, CPU, cia, vAddr, IorD, LorS, pAddr, CCA, raw)
 830
 831 void load_memory PARAMS ((SIM_DESC sd, sim_cpu *cpu, address_word cia, uword64* memvalp, uword64* memval1p, int CCA, int AccessLength, address_word pAddr, address_word vAddr, int IorD));
 832 #define LoadMemory(memvalp,memval1p,CCA,AccessLength,pAddr,vAddr,IorD,raw) \
 833 load_memory (SD, CPU, cia, memvalp, memval1p, CCA, AccessLength, pAddr, vAddr, IorD)
 834
 835 void store_memory PARAMS ((SIM_DESC sd, sim_cpu *cpu, address_word cia, int CCA, int AccessLength, uword64 MemElem, uword64 MemElem1, address_word pAddr, address_word vAddr));
 836 #define StoreMemory(CCA,AccessLength,MemElem,MemElem1,pAddr,vAddr,raw) \
 837 store_memory (SD, CPU, cia, CCA, AccessLength, MemElem, MemElem1, pAddr, vAddr)
 838
 839 void cache_op PARAMS ((SIM_DESC sd, sim_cpu *cpu, address_word cia, int op, address_word pAddr, address_word vAddr, unsigned int instruction));
 840 #define CacheOp(op,pAddr,vAddr,instruction) \
 841 cache_op (SD, CPU, cia, op, pAddr, vAddr, instruction)
 842
 843 void sync_operation PARAMS ((SIM_DESC sd, sim_cpu *cpu, address_word cia, int stype));
 844 #define SyncOperation(stype) \
 845 sync_operation (SD, CPU, cia, (stype))
 846
 847 void prefetch PARAMS ((SIM_DESC sd, sim_cpu *cpu, address_word cia, int CCA, address_word pAddr, address_word vAddr, int DATA, int hint));
 848 #define Prefetch(CCA,pAddr,vAddr,DATA,hint) \
 849 prefetch (SD, CPU, cia, CCA, pAddr, vAddr, DATA, hint)
 850
 851 unsigned32 ifetch32 PARAMS ((SIM_DESC sd, sim_cpu *cpu, address_word cia, address_word vaddr));
 852 #define IMEM32(CIA) ifetch32 (SD, CPU, (CIA), (CIA))
 853 unsigned16 ifetch16 PARAMS ((SIM_DESC sd, sim_cpu *cpu, address_word cia, address_word vaddr));
 854 #define IMEM16(CIA,NR) ifetch16 (SD, CPU, (CIA), ((CIA) & ~1) + 2 * (NR))
 855 #define IMEM16_IMMED(CIA,NR) ifetch16 (SD, CPU, (CIA), ((CIA) & ~1) + 2 * (NR))
 856
 857 void dotrace PARAMS ((SIM_DESC sd, sim_cpu *cpu, FILE *tracefh, int type, SIM_ADDR address, int width, char *comment, ...));
 858 FILE *tracefh;
 859
 860 void pending_tick PARAMS ((SIM_DESC sd, sim_cpu *cpu, address_word cia));
 861
 862 #endif