244 lines
6 KiB
C
244 lines
6 KiB
C
# Simulator main loop for IQ2000. -*- C -*-
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# Copyright (C) 1998-2022 Free Software Foundation, Inc.
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# Contributed by Cygnus Solutions.
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#
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# This file is part of the GNU Simulators.
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#
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# This program is free software; you can redistribute it and/or modify
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# it under the terms of the GNU General Public License as published by
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# the Free Software Foundation; either version 3 of the License, or
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# (at your option) any later version.
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#
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# This program is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU General Public License for more details.
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#
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# You should have received a copy of the GNU General Public License
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# along with this program. If not, see <http://www.gnu.org/licenses/>.
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# Syntax:
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# /bin/sh mainloop.in command
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#
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# Command is one of:
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#
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# init
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# support
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# extract-{simple,scache,pbb}
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# {full,fast}-exec-{simple,scache,pbb}
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#
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# A target need only provide a "full" version of one of simple,scache,pbb.
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# If the target wants it can also provide a fast version of same.
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# It can't provide more than this, however for illustration's sake the IQ2000
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# port provides examples of all.
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# ??? After a few more ports are done, revisit.
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# Will eventually need to machine generate a lot of this.
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case "x$1" in
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xsupport)
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cat <<EOF
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#include <stdlib.h>
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static INLINE const IDESC *
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extract (SIM_CPU *current_cpu, PCADDR pc, CGEN_INSN_INT insn, ARGBUF *abuf,
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int fast_p)
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{
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const IDESC *id = @cpu@_decode (current_cpu, pc, insn, insn, abuf);
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@cpu@_fill_argbuf (current_cpu, abuf, id, pc, fast_p);
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if (! fast_p)
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{
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int trace_p = PC_IN_TRACE_RANGE_P (current_cpu, pc);
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int profile_p = PC_IN_PROFILE_RANGE_P (current_cpu, pc);
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@cpu@_fill_argbuf_tp (current_cpu, abuf, trace_p, profile_p);
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}
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return id;
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}
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static INLINE SEM_PC
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execute (SIM_CPU *current_cpu, SCACHE *sc, int fast_p)
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{
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SEM_PC vpc;
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/* Force R0 to zero before every insn. */
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@cpu@_h_gr_set (current_cpu, 0, 0);
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if (fast_p)
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{
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#if ! WITH_SEM_SWITCH_FAST
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#if WITH_SCACHE
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vpc = (*sc->argbuf.semantic.sem_fast) (current_cpu, sc);
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#else
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vpc = (*sc->argbuf.semantic.sem_fast) (current_cpu, &sc->argbuf);
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#endif
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#else
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abort ();
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#endif /* WITH_SEM_SWITCH_FAST */
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}
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else
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{
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#if ! WITH_SEM_SWITCH_FULL
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ARGBUF *abuf = &sc->argbuf;
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const IDESC *idesc = abuf->idesc;
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#if WITH_SCACHE_PBB
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int virtual_p = CGEN_ATTR_VALUE (NULL, idesc->attrs, CGEN_INSN_VIRTUAL);
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#else
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int virtual_p = 0;
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#endif
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if (! virtual_p)
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{
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/* FIXME: call x-before */
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if (ARGBUF_PROFILE_P (abuf))
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PROFILE_COUNT_INSN (current_cpu, abuf->addr, idesc->num);
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/* FIXME: Later make cover macros: PROFILE_INSN_{INIT,FINI}. */
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if (PROFILE_MODEL_P (current_cpu)
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&& ARGBUF_PROFILE_P (abuf))
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@cpu@_model_insn_before (current_cpu, 1 /*first_p*/);
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CGEN_TRACE_INSN_INIT (current_cpu, abuf, 1);
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CGEN_TRACE_INSN (current_cpu, idesc->idata,
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(const struct argbuf *) abuf, abuf->addr);
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}
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#if WITH_SCACHE
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vpc = (*sc->argbuf.semantic.sem_full) (current_cpu, sc);
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#else
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vpc = (*sc->argbuf.semantic.sem_full) (current_cpu, abuf);
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#endif
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if (! virtual_p)
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{
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/* FIXME: call x-after */
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if (PROFILE_MODEL_P (current_cpu)
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&& ARGBUF_PROFILE_P (abuf))
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{
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int cycles;
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cycles = (*idesc->timing->model_fn) (current_cpu, sc);
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@cpu@_model_insn_after (current_cpu, 1 /*last_p*/, cycles);
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}
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CGEN_TRACE_INSN_FINI (current_cpu, abuf, 1);
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}
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#else
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abort ();
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#endif /* WITH_SEM_SWITCH_FULL */
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}
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return vpc;
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}
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EOF
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;;
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xinit)
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;;
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xextract-simple | xextract-scache)
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# Inputs: current_cpu, vpc, sc, FAST_P
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# Outputs: sc filled in
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cat <<EOF
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{
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CGEN_INSN_INT insn = GETIMEMUSI (current_cpu, CPU2INSN(vpc));
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extract (current_cpu, vpc, insn, SEM_ARGBUF (sc), FAST_P);
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SEM_SKIP_COMPILE (current_cpu, sc, 1);
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}
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EOF
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;;
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xextract-pbb)
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# Inputs: current_cpu, pc, sc, max_insns, FAST_P
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# Outputs: sc, pc
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# sc must be left pointing past the last created entry.
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# pc must be left pointing past the last created entry.
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# If the pbb is terminated by a cti insn, SET_CTI_VPC(sc) must be called
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# to record the vpc of the cti insn.
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# SET_INSN_COUNT(n) must be called to record number of real insns.
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cat <<EOF
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{
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const IDESC *idesc;
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int icount = 0;
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/* Is the CTI instruction at the end of the PBB a likely branch? */
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int likely_cti;
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while (max_insns > 0)
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{
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USI insn = GETIMEMUSI (current_cpu, CPU2INSN(pc));
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idesc = extract (current_cpu, pc, insn, &sc->argbuf, FAST_P);
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SEM_SKIP_COMPILE (current_cpu, sc, 1);
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++sc;
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--max_insns;
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++icount;
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pc += idesc->length;
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if (IDESC_CTI_P (idesc))
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{
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/* Likely branches annul their delay slot if the branch is
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not taken by using the (skip ..) rtx. We'll rely on
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that. */
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likely_cti = (IDESC_SKIP_P (idesc));
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SET_CTI_VPC (sc - 1);
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if (CGEN_ATTR_VALUE (NULL, idesc->attrs, CGEN_INSN_DELAY_SLOT))
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{
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USI insn = GETIMEMUSI (current_cpu, CPU2INSN(pc));
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idesc = extract (current_cpu, pc, insn, &sc->argbuf, FAST_P);
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if (likely_cti && IDESC_CTI_P (idesc))
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{
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/* malformed program */
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sim_io_eprintf (CPU_STATE (current_cpu),
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"malformed program, \`%s' insn in branch likely delay slot\n",
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CGEN_INSN_NAME (idesc->idata));
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}
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else
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{
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++sc;
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--max_insns;
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++icount;
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pc += idesc->length;
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}
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}
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break;
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}
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}
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Finish:
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SET_INSN_COUNT (icount);
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}
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EOF
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;;
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xfull-exec-* | xfast-exec-*)
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# Inputs: current_cpu, sc, FAST_P
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# Outputs: vpc
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# vpc contains the address of the next insn to execute
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cat <<EOF
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{
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#if (! FAST_P && WITH_SEM_SWITCH_FULL) || (FAST_P && WITH_SEM_SWITCH_FAST)
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#define DEFINE_SWITCH
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#include "sem-switch.c"
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#else
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vpc = execute (current_cpu, vpc, FAST_P);
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#endif
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}
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EOF
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;;
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*)
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echo "Invalid argument to mainloop.in: $1" >&2
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exit 1
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;;
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esac
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