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|
# Simulator main loop for IQ2000. -*- C -*-
# Copyright (C) 1998-2023 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 <http://www.gnu.org/licenses/>.
# 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 <<EOF
#line $LINENO "$0"
#include <stdlib.h>
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*/);
CGEN_TRACE_INSN_INIT (current_cpu, abuf, 1);
CGEN_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);
}
CGEN_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 <<EOF
#line $LINENO "$0"
{
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 <<EOF
#line $LINENO "$0"
{
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))
{
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 <<EOF
#line $LINENO "$0"
{
#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
|
