302 lines
7.0 KiB
C
302 lines
7.0 KiB
C
# Simulator main loop for i960. -*- C -*-
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# Copyright (C) 1996, 1997, 1998, 1999 Free Software Foundation, Inc.
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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 2, or (at your option)
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# 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 along
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# with this program; if not, write to the Free Software Foundation, Inc.,
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# 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
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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 M32R
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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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/*static INLINE*/ const IDESC *
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extract32 (SIM_CPU *current_cpu, PCADDR pc, CGEN_INSN_INT insn,
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ARGBUF *abuf, int fast_p)
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{
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/* ??? wilson, instructions are 32 bits. */
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const IDESC *d = @cpu@_decode (current_cpu, pc, (USI) insn, abuf);
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@cpu@_fill_argbuf (current_cpu, abuf, d, 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 d;
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}
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#if 0
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/*static INLINE*/ const IDESC *
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/* ??? wilson, Some instructions are 64 bits. */
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extract64 (SIM_CPU *current_cpu, PCADDR pc, insn_t insn,
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ARGBUF *abuf, int fast_p)
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{
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const IDESC *d = @cpu@_decode (current_cpu, pc, (UDI) insn >> 32, abuf);
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SEM_SET_CODE (abuf, d, fast_p);
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abuf->idesc = d;
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abuf->addr = pc;
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return d;
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}
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#endif
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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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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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const CGEN_INSN *insn = idesc->idata;
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#if WITH_SCACHE_PBB
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int virtual_p = CGEN_INSN_ATTR_VALUE (insn, 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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@cpu@_model_insn_before (current_cpu, 1 /*first_p*/);
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TRACE_INSN_INIT (current_cpu, abuf, 1);
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TRACE_INSN (current_cpu, insn,
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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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{
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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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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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cat <<EOF
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/*xxxinit*/
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EOF
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;;
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xextract-simple | xextract-scache)
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cat <<EOF
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{
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if ((pc & 3) != 0)
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{
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abort ();
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#if 0
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/* This only occurs when single stepping.
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The test is unnecessary otherwise, but the cost is teensy,
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compared with decoding/extraction. */
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UHI insn = GETIMEMUHI (current_cpu, pc);
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extract16 (current_cpu, pc, insn & 0x7fff, sc, FAST_P);
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#endif
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}
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else
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{
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USI insn = GETIMEMUSI (current_cpu, pc);
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/* ??? wilson, insns are 32 bits, unless MEMB with displacement, which
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has high bit set, bit 12 set, and mode of 5, 12, 13, 14, or 15. */
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if (((SI) insn > 0)
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|| ! (((insn & 0x3000) == 0x3000)
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|| ((insn & 0x3C00) == 0x1400)))
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{
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extract32 (current_cpu, pc, insn, sc, FAST_P);
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}
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else
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{
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UDI llinsn = (((UDI) insn << 32) || GETIMEMUSI (current_cpu, pc+4));
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extract64 (current_cpu, pc, llinsn, sc, FAST_P);
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}
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}
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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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if ((pc & 3) != 0)
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{
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abort ();
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#if 0
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/* This only occurs when single stepping.
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The test is unnecessary otherwise, but the cost is teensy,
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compared with decoding/extraction. */
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UHI insn = GETIMEMUHI (current_cpu, pc);
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idesc = extract16 (current_cpu, pc, insn & 0x7fff, &sc->argbuf, FAST_P);
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++sc;
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--max_insns;
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++icount;
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pc += 2;
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if (IDESC_CTI_P (idesc))
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{
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SET_CTI_VPC (sc - 1);
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goto Finish;
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}
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#endif
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}
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while (max_insns > 0)
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{
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USI insn = GETIMEMUSI (current_cpu, pc);
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#if 0
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/* ??? wilson, insns are 32 bits, unless MEMB with displacement, which
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has high bit set, bit 12 set, and mode of 5, 12, 13, 14, or 15. */
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if (((SI) insn > 0)
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|| ! (((insn & 0x3000) == 0x3000)
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|| ((insn & 0x3C00) == 0x1400)))
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{
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idesc = extract32 (current_cpu, pc, insn, &sc->argbuf, FAST_P);
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++sc;
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--max_insns;
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++icount;
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pc += 4;
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if (IDESC_CTI_P (idesc))
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{
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SET_CTI_VPC (sc - 1);
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break;
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}
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}
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else
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{
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idesc = extract64 (current_cpu, pc, insn, &sc->argbuf, FAST_P);
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++sc;
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--max_insns;
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++icount;
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pc += 8;
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if (IDESC_CTI_P (idesc))
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{
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SET_CTI_VPC (sc - 1);
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break;
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}
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}
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#else
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idesc = extract32 (current_cpu, pc, insn, &sc->argbuf, FAST_P);
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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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SET_CTI_VPC (sc - 1);
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break;
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}
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}
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#endif
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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, vpc, FAST_P
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# Outputs: vpc
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# vpc is the virtual program counter.
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cat <<EOF
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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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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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