Subversion Repositories openrisc_2011-10-31

# Simulator main loop for IQ2000. -*- C -*-

# Copyright (C) 1998, 1999, 2007, 2008 Free Software Foundation, Inc.

# Contributed by Cygnus Solutions.

#

# This file is part of the GNU Simulators.

#

# This program is free software; you can redistribute it and/or modify

# it under the terms of the GNU General Public License as published by

# the Free Software Foundation; either version 3 of the License, or

# (at your option) any later version.

#

# This program is distributed in the hope that it will be useful,

# but WITHOUT ANY WARRANTY; without even the implied warranty of

# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the

# GNU General Public License for more details.

#

# You should have received a copy of the GNU General Public License

# along with this program.  If not, see .

# Syntax:

# /bin/sh mainloop.in command

#

# Command is one of:

#

# init

# support

# extract-{simple,scache,pbb}

# {full,fast}-exec-{simple,scache,pbb}

#

# A target need only provide a "full" version of one of simple,scache,pbb.

# If the target wants it can also provide a fast version of same.

# It can't provide more than this, however for illustration's sake the IQ2000

# port provides examples of all.

# ??? After a few more ports are done, revisit.

# Will eventually need to machine generate a lot of this.

case "x$1" in

xsupport)

cat <

static INLINE const IDESC *

extract (SIM_CPU *current_cpu, PCADDR pc, CGEN_INSN_INT insn, ARGBUF *abuf,

         int fast_p)

{

  const IDESC *id = @cpu@_decode (current_cpu, pc, insn, insn, abuf);

  @cpu@_fill_argbuf (current_cpu, abuf, id, pc, fast_p);

  if (! fast_p)

    {

      int trace_p = PC_IN_TRACE_RANGE_P (current_cpu, pc);

      int profile_p = PC_IN_PROFILE_RANGE_P (current_cpu, pc);

      @cpu@_fill_argbuf_tp (current_cpu, abuf, trace_p, profile_p);

    }

  return id;

}

static INLINE SEM_PC

execute (SIM_CPU *current_cpu, SCACHE *sc, int fast_p)

{

  SEM_PC vpc;

  /* Force R0 to zero before every insn.  */

  @cpu@_h_gr_set (current_cpu, 0, 0);

  if (fast_p)

    {

#if ! WITH_SEM_SWITCH_FAST

#if WITH_SCACHE

      vpc = (*sc->argbuf.semantic.sem_fast) (current_cpu, sc);

#else

      vpc = (*sc->argbuf.semantic.sem_fast) (current_cpu, &sc->argbuf);

#endif

#else

      abort ();

#endif /* WITH_SEM_SWITCH_FAST */

    }

  else

    {

#if ! WITH_SEM_SWITCH_FULL

      ARGBUF *abuf = &sc->argbuf;

      const IDESC *idesc = abuf->idesc;

#if WITH_SCACHE_PBB

      int virtual_p = CGEN_ATTR_VALUE (NULL, idesc->attrs, CGEN_INSN_VIRTUAL);

#else

      int virtual_p = 0;

#endif

      if (! virtual_p)

        {

          /* FIXME: call x-before */

          if (ARGBUF_PROFILE_P (abuf))

            PROFILE_COUNT_INSN (current_cpu, abuf->addr, idesc->num);

          /* FIXME: Later make cover macros: PROFILE_INSN_{INIT,FINI}.  */

          if (PROFILE_MODEL_P (current_cpu)

              && ARGBUF_PROFILE_P (abuf))

            @cpu@_model_insn_before (current_cpu, 1 /*first_p*/);

          TRACE_INSN_INIT (current_cpu, abuf, 1);

          TRACE_INSN (current_cpu, idesc->idata,

                      (const struct argbuf *) abuf, abuf->addr);

        }

#if WITH_SCACHE

      vpc = (*sc->argbuf.semantic.sem_full) (current_cpu, sc);

#else

      vpc = (*sc->argbuf.semantic.sem_full) (current_cpu, abuf);

#endif

      if (! virtual_p)

        {

          /* FIXME: call x-after */

          if (PROFILE_MODEL_P (current_cpu)

              && ARGBUF_PROFILE_P (abuf))

            {

              int cycles;

              cycles = (*idesc->timing->model_fn) (current_cpu, sc);

              @cpu@_model_insn_after (current_cpu, 1 /*last_p*/, cycles);

            }

          TRACE_INSN_FINI (current_cpu, abuf, 1);

        }

#else

      abort ();

#endif /* WITH_SEM_SWITCH_FULL */

    }

  return vpc;

}

EOF

;;

xinit)

;;

xextract-simple | xextract-scache)

# Inputs:  current_cpu, vpc, sc, FAST_P

# Outputs: sc filled in

cat <

{

  CGEN_INSN_INT insn = GETIMEMUSI (current_cpu, CPU2INSN(vpc));

  extract (current_cpu, vpc, insn, SEM_ARGBUF (sc), FAST_P);

  SEM_SKIP_COMPILE (current_cpu, sc, 1);

}

EOF

;;

xextract-pbb)

# Inputs:  current_cpu, pc, sc, max_insns, FAST_P

# Outputs: sc, pc

# sc must be left pointing past the last created entry.

# pc must be left pointing past the last created entry.

# If the pbb is terminated by a cti insn, SET_CTI_VPC(sc) must be called

# to record the vpc of the cti insn.

# SET_INSN_COUNT(n) must be called to record number of real insns.

cat <

{

  const IDESC *idesc;

  int icount = 0;

  /* Is the CTI instruction at the end of the PBB a likely branch?  */

  int likely_cti;

  while (max_insns > 0)

    {

      USI insn = GETIMEMUSI (current_cpu, CPU2INSN(pc));

      idesc = extract (current_cpu, pc, insn, &sc->argbuf, FAST_P);

      SEM_SKIP_COMPILE (current_cpu, sc, 1);

      ++sc;

      --max_insns;

      ++icount;

      pc += idesc->length;

      if (IDESC_CTI_P (idesc))

        {

          /* Likely branches annul their delay slot if the branch is

             not taken by using the (skip ..) rtx.  We'll rely on

             that.  */

          likely_cti = (IDESC_SKIP_P (idesc));

          SET_CTI_VPC (sc - 1);

          if (CGEN_ATTR_VALUE (NULL, idesc->attrs, CGEN_INSN_DELAY_SLOT))

            {

              USI insn = GETIMEMUSI (current_cpu, CPU2INSN(pc));

              idesc = extract (current_cpu, pc, insn, &sc->argbuf, FAST_P);

              if (likely_cti && IDESC_CTI_P (idesc))

                {

                  /* malformed program */

                  sim_io_eprintf (CPU_STATE (current_cpu),

                    "malformed program, \`%s' insn in branch likely delay slot\n",

                    CGEN_INSN_NAME (idesc->idata));

                }

              else

                {

                  ++sc;

                  --max_insns;

                  ++icount;

                  pc += idesc->length;

                }

            }

          break;

        }

    }

 Finish:

  SET_INSN_COUNT (icount);

}

EOF

;;

xfull-exec-* | xfast-exec-*)

# Inputs: current_cpu, sc, FAST_P

# Outputs: vpc

# vpc contains the address of the next insn to execute

cat <

{

#if (! FAST_P && WITH_SEM_SWITCH_FULL) || (FAST_P && WITH_SEM_SWITCH_FAST)

#define DEFINE_SWITCH

#include "sem-switch.c"

#else

  vpc = execute (current_cpu, vpc, FAST_P);

#endif

}

EOF

;;

*)

  echo "Invalid argument to mainloop.in: $1" >&2

  exit 1

  ;;

esac