sim/m32r/mloop.in

   1 # Simulator main loop for m32r. -*- C -*-
   2 #
   3 # Copyright (C) 1996-2024 Free Software Foundation, Inc.
   4 #
   5 # This file is part of the GNU Simulators.
   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 3 of the License, or
  10 # (at your option) 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
  18 # along with this program.  If not, see <http://www.gnu.org/licenses/>.
  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, or if
  32 # the slow (full featured) version is `simple', then the fast version can be
  33 # one of scache/pbb.
  34 # A target can't provide more than this.
  35 # However for illustration's sake this file provides examples of all.
  36
  37 # ??? After a few more ports are done, revisit.
  38 # Will eventually need to machine generate a lot of this.
  39
  40 case "x$1" in
  41
  42 xsupport)
  43
  44 cat <<EOF
  45 #line $LINENO "$0"
  46 #include <stdlib.h>
  47
  48 static INLINE const IDESC *
  49 extract16 (SIM_CPU *current_cpu, PCADDR pc, CGEN_INSN_INT insn,
  50            ARGBUF *abuf, int fast_p)
  51 {
  52   const IDESC *id = @cpu@_decode (current_cpu, pc, insn, insn, abuf);
  53
  54   @cpu@_fill_argbuf (current_cpu, abuf, id, pc, fast_p);
  55   if (! fast_p)
  56     {
  57       int trace_p = PC_IN_TRACE_RANGE_P (current_cpu, pc);
  58       int profile_p = PC_IN_PROFILE_RANGE_P (current_cpu, pc);
  59       @cpu@_fill_argbuf_tp (current_cpu, abuf, trace_p, profile_p);
  60     }
  61   return id;
  62 }
  63
  64 static INLINE const IDESC *
  65 extract32 (SIM_CPU *current_cpu, PCADDR pc, CGEN_INSN_INT insn,
  66            ARGBUF *abuf, int fast_p)
  67 {
  68   const IDESC *id = @cpu@_decode (current_cpu, pc, (USI) insn >> 16, insn, abuf);
  69
  70   @cpu@_fill_argbuf (current_cpu, abuf, id, pc, fast_p);
  71   if (! fast_p)
  72     {
  73       int trace_p = PC_IN_TRACE_RANGE_P (current_cpu, pc);
  74       int profile_p = PC_IN_PROFILE_RANGE_P (current_cpu, pc);
  75       @cpu@_fill_argbuf_tp (current_cpu, abuf, trace_p, profile_p);
  76     }
  77   return id;
  78 }
  79
  80 static INLINE SEM_PC
  81 execute (SIM_CPU *current_cpu, SCACHE *sc, int fast_p)
  82 {
  83   SEM_PC vpc;
  84
  85   if (fast_p)
  86     {
  87 #if ! WITH_SEM_SWITCH_FAST
  88 #if WITH_SCACHE
  89       vpc = (*sc->argbuf.semantic.sem_fast) (current_cpu, sc);
  90 #else
  91       vpc = (*sc->argbuf.semantic.sem_fast) (current_cpu, &sc->argbuf);
  92 #endif
  93 #else
  94       abort ();
  95 #endif /* WITH_SEM_SWITCH_FAST */
  96     }
  97   else
  98     {
  99 #if ! WITH_SEM_SWITCH_FULL
 100       ARGBUF *abuf = &sc->argbuf;
 101       const IDESC *idesc = abuf->idesc;
 102       const CGEN_INSN *idata = idesc->idata;
 103 #if WITH_SCACHE_PBB
 104       int virtual_p = CGEN_INSN_ATTR_VALUE (idata, CGEN_INSN_VIRTUAL);
 105 #else
 106       int virtual_p = 0;
 107 #endif
 108
 109       if (! virtual_p)
 110         {
 111           /* FIXME: call x-before */
 112           if (ARGBUF_PROFILE_P (abuf))
 113             PROFILE_COUNT_INSN (current_cpu, abuf->addr, idesc->num);
 114           /* FIXME: Later make cover macros: PROFILE_INSN_{INIT,FINI}.  */
 115           if (PROFILE_MODEL_P (current_cpu)
 116               && ARGBUF_PROFILE_P (abuf))
 117             @cpu@_model_insn_before (current_cpu, 1 /*first_p*/);
 118           CGEN_TRACE_INSN_INIT (current_cpu, abuf, 1);
 119           CGEN_TRACE_INSN (current_cpu, idata,
 120                       (const struct argbuf *) abuf, abuf->addr);
 121         }
 122 #if WITH_SCACHE
 123       vpc = (*sc->argbuf.semantic.sem_full) (current_cpu, sc);
 124 #else
 125       vpc = (*sc->argbuf.semantic.sem_full) (current_cpu, abuf);
 126 #endif
 127       if (! virtual_p)
 128         {
 129           /* FIXME: call x-after */
 130           if (PROFILE_MODEL_P (current_cpu)
 131               && ARGBUF_PROFILE_P (abuf))
 132             {
 133               int cycles;
 134
 135               cycles = (*idesc->timing->model_fn) (current_cpu, sc);
 136               @cpu@_model_insn_after (current_cpu, 1 /*last_p*/, cycles);
 137             }
 138           CGEN_TRACE_INSN_FINI (current_cpu, abuf, 1);
 139         }
 140 #else
 141       abort ();
 142 #endif /* WITH_SEM_SWITCH_FULL */
 143     }
 144
 145   return vpc;
 146 }
 147
 148 EOF
 149
 150 ;;
 151
 152 xinit)
 153
 154 # Nothing needed.
 155
 156 ;;
 157
 158 xextract-simple | xextract-scache)
 159
 160 cat <<EOF
 161 #line $LINENO "$0"
 162 {
 163   if ((pc & 3) != 0)
 164     {
 165       /* This only occurs when single stepping.
 166          The test is unnecessary otherwise, but the cost is teensy,
 167          compared with decoding/extraction.  */
 168       UHI insn = GETIMEMUHI (current_cpu, pc);
 169       extract16 (current_cpu, pc, insn & 0x7fff, sc, FAST_P);
 170     }
 171   else
 172     {
 173       USI insn = GETIMEMUSI (current_cpu, pc);
 174       if ((SI) insn < 0)
 175         {
 176           extract32 (current_cpu, pc, insn, sc, FAST_P);
 177         }
 178       else
 179         {
 180           extract16 (current_cpu, pc, insn >> 16, sc, FAST_P);
 181           extract16 (current_cpu, pc + 2, insn & 0x7fff, sc + 1, FAST_P);
 182           /* The m32r doesn't support parallel execution.  */
 183           if ((insn & 0x8000) != 0
 184               && (insn & 0x7fff) != 0x7000) /* parallel nops are ok */
 185             sim_engine_illegal_insn (current_cpu, pc);
 186         }
 187     }
 188 }
 189 EOF
 190
 191 ;;
 192
 193 xextract-pbb)
 194
 195 # Inputs:  current_cpu, pc, sc, max_insns, FAST_P
 196 # Outputs: sc, pc
 197 # sc must be left pointing past the last created entry.
 198 # pc must be left pointing past the last created entry.
 199 # If the pbb is terminated by a cti insn, SET_CTI_VPC(sc) must be called
 200 # to record the vpc of the cti insn.
 201 # SET_INSN_COUNT(n) must be called to record number of real insns.
 202
 203 cat <<EOF
 204 #line $LINENO "$0"
 205 {
 206   const IDESC *idesc;
 207   int icount = 0;
 208
 209   if ((pc & 3) != 0)
 210     {
 211       /* This only occurs when single stepping.
 212          The test is unnecessary otherwise, but the cost is teensy,
 213          compared with decoding/extraction.  */
 214       UHI insn = GETIMEMUHI (current_cpu, pc);
 215       idesc = extract16 (current_cpu, pc, insn & 0x7fff, &sc->argbuf, FAST_P);
 216       ++sc;
 217       --max_insns;
 218       ++icount;
 219       pc += 2;
 220       if (IDESC_CTI_P (idesc))
 221         {
 222           SET_CTI_VPC (sc - 1);
 223           goto Finish;
 224         }
 225     }
 226
 227   while (max_insns > 0)
 228     {
 229       USI insn = GETIMEMUSI (current_cpu, pc);
 230       if ((SI) insn < 0)
 231         {
 232           idesc = extract32 (current_cpu, pc, insn, &sc->argbuf, FAST_P);
 233           ++sc;
 234           --max_insns;
 235           ++icount;
 236           pc += 4;
 237           if (IDESC_CTI_P (idesc))
 238             {
 239               SET_CTI_VPC (sc - 1);
 240               break;
 241             }
 242         }
 243       else
 244         {
 245           idesc = extract16 (current_cpu, pc, insn >> 16, &sc->argbuf, FAST_P);
 246           ++sc;
 247           --max_insns;
 248           ++icount;
 249           pc += 2;
 250           if (IDESC_CTI_P (idesc))
 251             {
 252               SET_CTI_VPC (sc - 1);
 253               break;
 254             }
 255           /* The m32r doesn't support parallel execution.  */
 256           if ((insn & 0x8000) != 0)
 257             {
 258               /* ??? Defer signalling to execution.  */
 259               if ((insn & 0x7fff) != 0x7000) /* parallel nops are ok */
 260                 sim_engine_invalid_insn (current_cpu, pc - 2, 0);
 261               /* There's no point in processing parallel nops in fast mode.
 262                  We might as well do this test since we've already tested
 263                  that we have a parallel nop.  */
 264               if (0 && FAST_P)
 265                 {
 266                   pc += 2;
 267                   continue;
 268                 }
 269             }
 270           else
 271             {
 272               /* Non-parallel case.
 273                  While we're guaranteed that there's room to extract the
 274                  insn, when single stepping we can't; the pbb must stop
 275                  after the first insn.  */
 276               if (max_insns == 0)
 277                 break;
 278             }
 279           /* We're guaranteed that we can always process 16 bit insns in
 280              pairs.  */
 281           idesc = extract16 (current_cpu, pc, insn & 0x7fff, &sc->argbuf, FAST_P);
 282           ++sc;
 283           --max_insns;
 284           ++icount;
 285           pc += 2;
 286           if (IDESC_CTI_P (idesc))
 287             {
 288               SET_CTI_VPC (sc - 1);
 289               break;
 290             }
 291         }
 292     }
 293
 294  Finish:
 295   SET_INSN_COUNT (icount);
 296 }
 297 EOF
 298
 299 ;;
 300
 301 xfull-exec-* | xfast-exec-*)
 302
 303 # Inputs: current_cpu, vpc, FAST_P
 304 # Outputs: vpc
 305 # vpc is the virtual program counter.
 306
 307 cat <<EOF
 308 #line $LINENO "$0"
 309 #if (! FAST_P && WITH_SEM_SWITCH_FULL) || (FAST_P && WITH_SEM_SWITCH_FAST)
 310 #define DEFINE_SWITCH
 311 #include "sem-switch.c"
 312 #else
 313   vpc = execute (current_cpu, vpc, FAST_P);
 314 #endif
 315 EOF
 316
 317 ;;
 318
 319 *)
 320   echo "Invalid argument to mainloop.in: $1" >&2
 321   exit 1
 322   ;;
 323
 324 esac