sim/common/cgen-utils.c

   1 /* Support code for various pieces of CGEN simulators.
   2    Copyright (C) 1996, 1997, 1998, 1999, 2007, 2008, 2009, 2010
   3    Free Software Foundation, Inc.
   4    Contributed by Cygnus Support.
   5
   6 This file is part of GDB, the GNU debugger.
   7
   8 This program is free software; you can redistribute it and/or modify
   9 it under the terms of the GNU General Public License as published by
  10 the Free Software Foundation; either version 3 of the License, or
  11 (at your option) any later version.
  12
  13 This program is distributed in the hope that it will be useful,
  14 but WITHOUT ANY WARRANTY; without even the implied warranty of
  15 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16 GNU General Public License for more details.
  17
  18 You should have received a copy of the GNU General Public License
  19 along with this program.  If not, see <http://www.gnu.org/licenses/>.  */
  20
  21 #include "bfd.h"
  22 #include "sim-main.h"
  23 #include "dis-asm.h"
  24
  25 #define MEMOPS_DEFINE_INLINE
  26 #include "cgen-mem.h"
  27
  28 #define SEMOPS_DEFINE_INLINE
  29 #include "cgen-ops.h"
  30
  31 #undef min
  32 #define min(a,b) ((a) < (b) ? (a) : (b))
  33
  34 const char *mode_names[] = {
  35   "VOID",
  36   "BI",
  37   "QI",
  38   "HI",
  39   "SI",
  40   "DI",
  41   "UQI",
  42   "UHI",
  43   "USI",
  44   "UDI",
  45   "SF",
  46   "DF",
  47   "XF",
  48   "TF",
  49   0, /* MODE_TARGET_MAX */
  50   "INT",
  51   "UINT",
  52   "PTR"
  53 };
  54
  55 /* Opcode table for virtual insns used by the simulator.  */
  56
  57 #define V CGEN_ATTR_MASK (CGEN_INSN_VIRTUAL)
  58
  59 static const CGEN_IBASE virtual_insn_entries[] =
  60 {
  61   {
  62     VIRTUAL_INSN_X_INVALID, "--invalid--", NULL, 0, { V, { 0 } }
  63   },
  64   {
  65     VIRTUAL_INSN_X_BEFORE, "--before--", NULL, 0, { V, { 0 } }
  66   },
  67   {
  68     VIRTUAL_INSN_X_AFTER, "--after--", NULL, 0, { V, { 0 } }
  69   },
  70   {
  71     VIRTUAL_INSN_X_BEGIN, "--begin--", NULL, 0, { V, { 0 } }
  72   },
  73   {
  74     VIRTUAL_INSN_X_CHAIN, "--chain--", NULL, 0, { V, { 0 } }
  75   },
  76   {
  77     VIRTUAL_INSN_X_CTI_CHAIN, "--cti-chain--", NULL, 0, { V, { 0 } }
  78   }
  79 };
  80
  81 #undef V
  82
  83 const CGEN_INSN cgen_virtual_insn_table[] =
  84 {
  85   { & virtual_insn_entries[0] },
  86   { & virtual_insn_entries[1] },
  87   { & virtual_insn_entries[2] },
  88   { & virtual_insn_entries[3] },
  89   { & virtual_insn_entries[4] },
  90   { & virtual_insn_entries[5] }
  91 };
  92
  93 /* Initialize cgen things.
  94    This is called after sim_post_argv_init.  */
  95
  96 void
  97 cgen_init (SIM_DESC sd)
  98 {
  99   int i, c;
 100
 101   /* If no profiling or tracing has been enabled, run in fast mode.  */
 102   {
 103     int run_fast_p = 1;
 104
 105     for (c = 0; c < MAX_NR_PROCESSORS; ++c)
 106       {
 107         SIM_CPU *cpu = STATE_CPU (sd, c);
 108
 109         for (i = 0; i < MAX_PROFILE_VALUES; ++i)
 110           if (CPU_PROFILE_FLAGS (cpu) [i])
 111             {
 112               run_fast_p = 0;
 113               break;
 114             }
 115         for (i = 0; i < MAX_TRACE_VALUES; ++i)
 116           if (CPU_TRACE_FLAGS (cpu) [i])
 117             {
 118               run_fast_p = 0;
 119               break;
 120             }
 121         if (! run_fast_p)
 122           break;
 123       }
 124     STATE_RUN_FAST_P (sd) = run_fast_p;
 125   }
 126 }
 127
 128 /* Return the name of insn number I.  */
 129
 130 const char *
 131 cgen_insn_name (SIM_CPU *cpu, int i)
 132 {
 133   return CGEN_INSN_NAME ((* CPU_GET_IDATA (cpu)) ((cpu), (i)));
 134 }
 135
 136 /* Return the maximum number of extra bytes required for a SIM_CPU struct.  */
 137
 138 int
 139 cgen_cpu_max_extra_bytes (void)
 140 {
 141   int i;
 142   int extra = 0;
 143
 144   for (i = 0; sim_machs[i] != 0; ++i)
 145     {
 146       int size = IMP_PROPS_SIM_CPU_SIZE (MACH_IMP_PROPS (sim_machs[i]));
 147       if (size > extra)
 148         extra = size;
 149     }
 150   return extra;
 151 }
 152 \f
 153 #ifdef DI_FN_SUPPORT
 154
 155 DI
 156 make_struct_di (hi, lo)
 157      SI hi, lo;
 158 {
 159   DI result;
 160
 161   result.hi = hi;
 162   result.lo = lo;
 163   return result;
 164 }
 165
 166 DI
 167 ANDDI (a, b)
 168      DI a, b;
 169 {
 170   SI ahi = GETHIDI (a);
 171   SI alo = GETLODI (a);
 172   SI bhi = GETHIDI (b);
 173   SI blo = GETLODI (b);
 174   return MAKEDI (ahi & bhi, alo & blo);
 175 }
 176
 177 DI
 178 ORDI (a, b)
 179      DI a, b;
 180 {
 181   SI ahi = GETHIDI (a);
 182   SI alo = GETLODI (a);
 183   SI bhi = GETHIDI (b);
 184   SI blo = GETLODI (b);
 185   return MAKEDI (ahi | bhi, alo | blo);
 186 }
 187
 188 DI
 189 ADDDI (a, b)
 190      DI a, b;
 191 {
 192   USI ahi = GETHIDI (a);
 193   USI alo = GETLODI (a);
 194   USI bhi = GETHIDI (b);
 195   USI blo = GETLODI (b);
 196   USI x = alo + blo;
 197   return MAKEDI (ahi + bhi + (x < alo), x);
 198 }
 199
 200 DI
 201 MULDI (a, b)
 202      DI a, b;
 203 {
 204   USI ahi = GETHIDI (a);
 205   USI alo = GETLODI (a);
 206   USI bhi = GETHIDI (b);
 207   USI blo = GETLODI (b);
 208   USI rhi,rlo;
 209   USI x0, x1, x2, x3;
 210
 211   x0 = alo * blo;
 212   x1 = alo * bhi;
 213   x2 = ahi * blo;
 214   x3 = ahi * bhi;
 215
 216 #define SI_TYPE_SIZE 32
 217 #define BITS4 (SI_TYPE_SIZE / 4)
 218 #define ll_B (1L << (SI_TYPE_SIZE / 2))
 219 #define ll_lowpart(t) ((USI) (t) % ll_B)
 220 #define ll_highpart(t) ((USI) (t) / ll_B)
 221   x1 += ll_highpart (x0);       /* this can't give carry */
 222   x1 += x2;                     /* but this indeed can */
 223   if (x1 < x2)                  /* did we get it? */
 224     x3 += ll_B;                 /* yes, add it in the proper pos. */
 225
 226   rhi = x3 + ll_highpart (x1);
 227   rlo = ll_lowpart (x1) * ll_B + ll_lowpart (x0);
 228   return MAKEDI (rhi + (alo * bhi) + (ahi * blo), rlo);
 229 }
 230
 231 DI
 232 SHLDI (val, shift)
 233      DI val;
 234      SI shift;
 235 {
 236   USI hi = GETHIDI (val);
 237   USI lo = GETLODI (val);
 238   /* FIXME: Need to worry about shift < 0 || shift >= 32.  */
 239   return MAKEDI ((hi << shift) | (lo >> (32 - shift)), lo << shift);
 240 }
 241
 242 DI
 243 SLADI (val, shift)
 244      DI val;
 245      SI shift;
 246 {
 247   SI hi = GETHIDI (val);
 248   USI lo = GETLODI (val);
 249   /* FIXME: Need to worry about shift < 0 || shift >= 32.  */
 250   return MAKEDI ((hi << shift) | (lo >> (32 - shift)), lo << shift);
 251 }
 252
 253 DI
 254 SRADI (val, shift)
 255      DI val;
 256      SI shift;
 257 {
 258   SI hi = GETHIDI (val);
 259   USI lo = GETLODI (val);
 260   /* We use SRASI because the result is implementation defined if hi < 0.  */
 261   /* FIXME: Need to worry about shift < 0 || shift >= 32.  */
 262   return MAKEDI (SRASI (hi, shift), (hi << (32 - shift)) | (lo >> shift));
 263 }
 264
 265 int
 266 GEDI (a, b)
 267      DI a, b;
 268 {
 269   SI ahi = GETHIDI (a);
 270   USI alo = GETLODI (a);
 271   SI bhi = GETHIDI (b);
 272   USI blo = GETLODI (b);
 273   if (ahi > bhi)
 274     return 1;
 275   if (ahi == bhi)
 276     return alo >= blo;
 277   return 0;
 278 }
 279
 280 int
 281 LEDI (a, b)
 282      DI a, b;
 283 {
 284   SI ahi = GETHIDI (a);
 285   USI alo = GETLODI (a);
 286   SI bhi = GETHIDI (b);
 287   USI blo = GETLODI (b);
 288   if (ahi < bhi)
 289     return 1;
 290   if (ahi == bhi)
 291     return alo <= blo;
 292   return 0;
 293 }
 294
 295 DI
 296 CONVHIDI (val)
 297      HI val;
 298 {
 299   if (val < 0)
 300     return MAKEDI (-1, val);
 301   else
 302     return MAKEDI (0, val);
 303 }
 304
 305 DI
 306 CONVSIDI (val)
 307      SI val;
 308 {
 309   if (val < 0)
 310     return MAKEDI (-1, val);
 311   else
 312     return MAKEDI (0, val);
 313 }
 314
 315 SI
 316 CONVDISI (val)
 317      DI val;
 318 {
 319   return GETLODI (val);
 320 }
 321
 322 #endif /* DI_FN_SUPPORT */
 323 \f
 324 QI
 325 RORQI (val, shift)
 326      QI  val;
 327      int shift;
 328 {
 329   if (shift != 0)
 330     {
 331       int remain = 8 - shift;
 332       int mask = (1 << shift) - 1;
 333       QI result = (val & mask) << remain;
 334       mask = (1 << remain) - 1;
 335       result |= (val >> shift) & mask;
 336       return result;
 337     }
 338   return val;
 339 }
 340
 341 QI
 342 ROLQI (val, shift)
 343      QI  val;
 344      int shift;
 345 {
 346   if (shift != 0)
 347     {
 348       int remain = 8 - shift;
 349       int mask = (1 << remain) - 1;
 350       QI result = (val & mask) << shift;
 351       mask = (1 << shift) - 1;
 352       result |= (val >> remain) & mask;
 353       return result;
 354     }
 355   return val;
 356 }
 357
 358 HI
 359 RORHI (val, shift)
 360      HI  val;
 361      int shift;
 362 {
 363   if (shift != 0)
 364     {
 365       int remain = 16 - shift;
 366       int mask = (1 << shift) - 1;
 367       HI result = (val & mask) << remain;
 368       mask = (1 << remain) - 1;
 369       result |= (val >> shift) & mask;
 370       return result;
 371     }
 372   return val;
 373 }
 374
 375 HI
 376 ROLHI (val, shift)
 377      HI  val;
 378      int shift;
 379 {
 380   if (shift != 0)
 381     {
 382       int remain = 16 - shift;
 383       int mask = (1 << remain) - 1;
 384       HI result = (val & mask) << shift;
 385       mask = (1 << shift) - 1;
 386       result |= (val >> remain) & mask;
 387       return result;
 388     }
 389   return val;
 390 }
 391
 392 SI
 393 RORSI (val, shift)
 394      SI  val;
 395      int shift;
 396 {
 397   if (shift != 0)
 398     {
 399       int remain = 32 - shift;
 400       int mask = (1 << shift) - 1;
 401       SI result = (val & mask) << remain;
 402       mask = (1 << remain) - 1;
 403       result |= (val >> shift) & mask;
 404       return result;
 405     }
 406   return val;
 407 }
 408
 409 SI
 410 ROLSI (val, shift)
 411      SI  val;
 412      int shift;
 413 {
 414   if (shift != 0)
 415     {
 416       int remain = 32 - shift;
 417       int mask = (1 << remain) - 1;
 418       SI result = (val & mask) << shift;
 419       mask = (1 << shift) - 1;
 420       result |= (val >> remain) & mask;
 421       return result;
 422     }
 423
 424   return val;
 425 }
 426
 427 /* Emit an error message from CGEN RTL.  */
 428
 429 void
 430 cgen_rtx_error (SIM_CPU *cpu, const char * msg)
 431 {
 432   SIM_DESC sd = CPU_STATE (cpu);
 433
 434   sim_io_printf (sd, msg);
 435   sim_io_printf (sd, "\n");
 436
 437   sim_engine_halt (sd, cpu, NULL, CIA_GET (cpu), sim_stopped, SIM_SIGTRAP);
 438 }