sim/i960/mloop.in

   1 # Simulator main loop for i960. -*- C -*-
   2 # Copyright (C) 1996, 1997, 1998, 1999 Free Software Foundation, Inc.
   3 #
   4 # This file is part of the GNU Simulators.
   5 #
   6 # This program is free software; you can redistribute it and/or modify
   7 # it under the terms of the GNU General Public License as published by
   8 # the Free Software Foundation; either version 2, or (at your option)
   9 # any later version.
  10 #
  11 # This program 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
  14 # GNU General Public License for more details.
  15 #
  16 # You should have received a copy of the GNU General Public License along
  17 # with this program; if not, write to the Free Software Foundation, Inc.,
  18 # 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
  19
  20 # Syntax:
  21 # /bin/sh mainloop.in command
  22 #
  23 # Command is one of:
  24 #
  25 # init
  26 # support
  27 # extract-{simple,scache,pbb}
  28 # {full,fast}-exec-{simple,scache,pbb}
  29 #
  30 # A target need only provide a "full" version of one of simple,scache,pbb.
  31 # If the target wants it can also provide a fast version of same.
  32 # It can't provide more than this, however for illustration's sake the M32R
  33 # port provides examples of all.
  34
  35 # ??? After a few more ports are done, revisit.
  36 # Will eventually need to machine generate a lot of this.
  37
  38 case "x$1" in
  39
  40 xsupport)
  41
  42 cat <<EOF
  43
  44 /*static INLINE*/ const IDESC *
  45 extract32 (SIM_CPU *current_cpu, PCADDR pc, CGEN_INSN_INT insn,
  46            ARGBUF *abuf, int fast_p)
  47 {
  48   /* ??? wilson, instructions are 32 bits.  */
  49   const IDESC *d = @cpu@_decode (current_cpu, pc, (USI) insn, abuf);
  50   @cpu@_fill_argbuf (current_cpu, abuf, d, pc, fast_p);
  51   if (! fast_p)
  52     {
  53       int trace_p = PC_IN_TRACE_RANGE_P (current_cpu, pc);
  54       int profile_p = PC_IN_PROFILE_RANGE_P (current_cpu, pc);
  55       @cpu@_fill_argbuf_tp (current_cpu, abuf, trace_p, profile_p);
  56     }
  57   return d;
  58 }
  59
  60 #if 0
  61 /*static INLINE*/ const IDESC *
  62 /* ??? wilson, Some instructions are 64 bits.  */
  63 extract64 (SIM_CPU *current_cpu, PCADDR pc, insn_t insn,
  64            ARGBUF *abuf, int fast_p)
  65 {
  66   const IDESC *d = @cpu@_decode (current_cpu, pc, (UDI) insn >> 32, abuf);
  67   SEM_SET_CODE (abuf, d, fast_p);
  68   abuf->idesc = d;
  69   abuf->addr = pc;
  70   return d;
  71 }
  72 #endif
  73
  74 static INLINE SEM_PC
  75 execute (SIM_CPU *current_cpu, SCACHE *sc, int fast_p)
  76 {
  77   SEM_PC vpc;
  78
  79   if (fast_p)
  80     {
  81 #if ! WITH_SEM_SWITCH_FAST
  82 #if WITH_SCACHE
  83       vpc = (*sc->argbuf.semantic.sem_fast) (current_cpu, sc);
  84 #else
  85       vpc = (*sc->argbuf.semantic.sem_fast) (current_cpu, &sc->argbuf);
  86 #endif
  87 #else
  88       abort ();
  89 #endif /* WITH_SEM_SWITCH_FAST */
  90     }
  91   else
  92     {
  93 #if ! WITH_SEM_SWITCH_FULL
  94       ARGBUF *abuf = &sc->argbuf;
  95       const IDESC *idesc = abuf->idesc;
  96       const CGEN_INSN *insn = idesc->idata;
  97 #if WITH_SCACHE_PBB
  98       int virtual_p = CGEN_INSN_ATTR_VALUE (insn, CGEN_INSN_VIRTUAL);
  99 #else
 100       int virtual_p = 0;
 101 #endif
 102
 103       if (! virtual_p)
 104         {
 105           /* FIXME: call x-before */
 106           if (ARGBUF_PROFILE_P (abuf))
 107             PROFILE_COUNT_INSN (current_cpu, abuf->addr, idesc->num);
 108           /* FIXME: Later make cover macros: PROFILE_INSN_{INIT,FINI}.  */
 109           if (PROFILE_MODEL_P (current_cpu))
 110             @cpu@_model_insn_before (current_cpu, 1 /*first_p*/);
 111           TRACE_INSN_INIT (current_cpu, abuf, 1);
 112           TRACE_INSN (current_cpu, insn,
 113                       (const struct argbuf *) abuf, abuf->addr);
 114         }
 115 #if WITH_SCACHE
 116       vpc = (*sc->argbuf.semantic.sem_full) (current_cpu, sc);
 117 #else
 118       vpc = (*sc->argbuf.semantic.sem_full) (current_cpu, abuf);
 119 #endif
 120       if (! virtual_p)
 121         {
 122           /* FIXME: call x-after */
 123           if (PROFILE_MODEL_P (current_cpu))
 124             {
 125               int cycles;
 126
 127               cycles = (*idesc->timing->model_fn) (current_cpu, sc);
 128               @cpu@_model_insn_after (current_cpu, 1 /*last_p*/, cycles);
 129             }
 130           TRACE_INSN_FINI (current_cpu, abuf, 1);
 131         }
 132 #else
 133       abort ();
 134 #endif /* WITH_SEM_SWITCH_FULL */
 135     }
 136
 137   return vpc;
 138 }
 139
 140 EOF
 141
 142 ;;
 143
 144 xinit)
 145
 146 cat <<EOF
 147 /*xxxinit*/
 148 EOF
 149
 150 ;;
 151
 152 xextract-simple | xextract-scache)
 153
 154 cat <<EOF
 155 {
 156   if ((pc & 3) != 0)
 157     {
 158       abort ();
 159 #if 0
 160       /* This only occurs when single stepping.
 161          The test is unnecessary otherwise, but the cost is teensy,
 162          compared with decoding/extraction.  */
 163       UHI insn = GETIMEMUHI (current_cpu, pc);
 164       extract16 (current_cpu, pc, insn & 0x7fff, sc, FAST_P);
 165 #endif
 166     }
 167   else
 168     {
 169       USI insn = GETIMEMUSI (current_cpu, pc);
 170       /* ??? wilson, insns are 32 bits, unless MEMB with displacement, which
 171          has high bit set, bit 12 set, and mode of 5, 12, 13, 14, or 15.  */
 172       if (((SI) insn > 0)
 173           || ! (((insn & 0x3000) == 0x3000)
 174                 || ((insn & 0x3C00) == 0x1400)))
 175         {
 176           extract32 (current_cpu, pc, insn, sc, FAST_P);
 177         }
 178       else
 179         {
 180           UDI llinsn = (((UDI) insn << 32) || GETIMEMUSI (current_cpu, pc+4));
 181           extract64 (current_cpu, pc, llinsn, sc, FAST_P);
 182         }
 183     }
 184 }
 185 EOF
 186
 187 ;;
 188
 189 xextract-pbb)
 190
 191 # Inputs:  current_cpu, pc, sc, max_insns, FAST_P
 192 # Outputs: sc, pc
 193 # sc must be left pointing past the last created entry.
 194 # pc must be left pointing past the last created entry.
 195 # If the pbb is terminated by a cti insn, SET_CTI_VPC(sc) must be called
 196 # to record the vpc of the cti insn.
 197 # SET_INSN_COUNT(n) must be called to record number of real insns.
 198
 199 cat <<EOF
 200 {
 201   const IDESC *idesc;
 202   int icount = 0;
 203
 204   if ((pc & 3) != 0)
 205     {
 206       abort ();
 207 #if 0
 208       /* This only occurs when single stepping.
 209          The test is unnecessary otherwise, but the cost is teensy,
 210          compared with decoding/extraction.  */
 211       UHI insn = GETIMEMUHI (current_cpu, pc);
 212       idesc = extract16 (current_cpu, pc, insn & 0x7fff, &sc->argbuf, FAST_P);
 213       ++sc;
 214       --max_insns;
 215       ++icount;
 216       pc += 2;
 217       if (IDESC_CTI_P (idesc))
 218         {
 219           SET_CTI_VPC (sc - 1);
 220           goto Finish;
 221         }
 222 #endif
 223     }
 224
 225   while (max_insns > 0)
 226     {
 227       USI insn = GETIMEMUSI (current_cpu, pc);
 228 #if 0
 229       /* ??? wilson, insns are 32 bits, unless MEMB with displacement, which
 230          has high bit set, bit 12 set, and mode of 5, 12, 13, 14, or 15.  */
 231       if (((SI) insn > 0)
 232           || ! (((insn & 0x3000) == 0x3000)
 233                 || ((insn & 0x3C00) == 0x1400)))
 234         {
 235           idesc = extract32 (current_cpu, pc, insn, &sc->argbuf, FAST_P);
 236           ++sc;
 237           --max_insns;
 238           ++icount;
 239           pc += 4;
 240           if (IDESC_CTI_P (idesc))
 241             {
 242               SET_CTI_VPC (sc - 1);
 243               break;
 244             }
 245         }
 246       else
 247         {
 248           idesc = extract64 (current_cpu, pc, insn, &sc->argbuf, FAST_P);
 249           ++sc;
 250           --max_insns;
 251           ++icount;
 252           pc += 8;
 253           if (IDESC_CTI_P (idesc))
 254             {
 255               SET_CTI_VPC (sc - 1);
 256               break;
 257             }
 258         }
 259 #else
 260       idesc = extract32 (current_cpu, pc, insn, &sc->argbuf, FAST_P);
 261       ++sc;
 262       --max_insns;
 263       ++icount;
 264       pc += idesc->length;
 265       if (IDESC_CTI_P (idesc))
 266         {
 267           SET_CTI_VPC (sc - 1);
 268           break;
 269         }
 270     }
 271 #endif
 272  Finish:
 273   SET_INSN_COUNT (icount);
 274 }
 275 EOF
 276
 277 ;;
 278
 279 xfull-exec-* | xfast-exec-*)
 280
 281 # Inputs: current_cpu, vpc, FAST_P
 282 # Outputs: vpc
 283 # vpc is the virtual program counter.
 284
 285 cat <<EOF
 286 #if (! FAST_P && WITH_SEM_SWITCH_FULL) || (FAST_P && WITH_SEM_SWITCH_FAST)
 287 #define DEFINE_SWITCH
 288 #include "sem-switch.c"
 289 #else
 290   vpc = execute (current_cpu, vpc, FAST_P);
 291 #endif
 292 EOF
 293
 294 ;;
 295
 296 *)
 297   echo "Invalid argument to mainloop.in: $1" >&2
 298   exit 1
 299   ;;
 300
 301 esac