--- /dev/null
+# Simulator main loop for m32r2. -*- C -*-
+# Copyright (C) 1996, 1997, 1998, 2003 Free Software Foundation, Inc.
+#
+# This file is part of GDB, the GNU debugger.
+#
+# 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 2, 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, write to the Free Software Foundation, Inc.,
+# 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
+
+# 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, or if
+# the slow (full featured) version is `simple', then the fast version can be
+# one of scache/pbb.
+# A target can't provide more than this.
+
+# ??? 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
+
+/* Emit insns to write back the results of insns executed in parallel.
+ SC points to a sufficient number of scache entries for the writeback
+ handlers.
+ SC1/ID1 is the first insn (left slot, lower address).
+ SC2/ID2 is the second insn (right slot, higher address). */
+
+static INLINE void
+emit_par_finish (SIM_CPU *current_cpu, PCADDR pc, SCACHE *sc,
+ SCACHE *sc1, const IDESC *id1, SCACHE *sc2, const IDESC *id2)
+{
+ ARGBUF *abuf;
+
+ abuf = &sc->argbuf;
+ id1 = id1->par_idesc;
+ abuf->fields.write.abuf = &sc1->argbuf;
+ @cpu@_fill_argbuf (current_cpu, abuf, id1, pc, 0);
+ /* no need to set trace_p,profile_p */
+#if 0 /* not currently needed for id2 since results written directly */
+ abuf = &sc[1].argbuf;
+ id2 = id2->par_idesc;
+ abuf->fields.write.abuf = &sc2->argbuf;
+ @cpu@_fill_argbuf (current_cpu, abuf, id2, pc + 2, 0);
+ /* no need to set trace_p,profile_p */
+#endif
+}
+
+static INLINE const IDESC *
+emit_16 (SIM_CPU *current_cpu, PCADDR pc, CGEN_INSN_INT insn,
+ SCACHE *sc, int fast_p, int parallel_p)
+{
+ ARGBUF *abuf = &sc->argbuf;
+ const IDESC *id = @cpu@_decode (current_cpu, pc, insn, insn, abuf);
+
+ if (parallel_p)
+ id = id->par_idesc;
+ @cpu@_fill_argbuf (current_cpu, abuf, id, pc, fast_p);
+ return id;
+}
+
+static INLINE const IDESC *
+emit_full16 (SIM_CPU *current_cpu, PCADDR pc, CGEN_INSN_INT insn, SCACHE *sc,
+ int trace_p, int profile_p)
+{
+ const IDESC *id;
+
+ @cpu@_emit_before (current_cpu, sc, pc, 1);
+ id = emit_16 (current_cpu, pc, insn, sc + 1, 0, 0);
+ @cpu@_emit_after (current_cpu, sc + 2, pc);
+ sc[1].argbuf.trace_p = trace_p;
+ sc[1].argbuf.profile_p = profile_p;
+ return id;
+}
+
+static INLINE const IDESC *
+emit_parallel (SIM_CPU *current_cpu, PCADDR pc, CGEN_INSN_INT insn,
+ SCACHE *sc, int fast_p)
+{
+ const IDESC *id,*id2;
+
+ /* Emit both insns, then emit a finisher-upper.
+ We speed things up by handling the second insn serially
+ [not parallelly]. Then the writeback only has to deal
+ with the first insn. */
+ /* ??? Revisit to handle exceptions right. */
+
+ /* FIXME: No need to handle this parallely if second is nop. */
+ id = emit_16 (current_cpu, pc, insn >> 16, sc, fast_p, 1);
+
+ /* Note that this can never be a cti. No cti's go in the S pipeline. */
+ id2 = emit_16 (current_cpu, pc + 2, insn & 0x7fff, sc + 1, fast_p, 0);
+
+ /* Set sc/snc insns notion of where to skip to. */
+ if (IDESC_SKIP_P (id))
+ SEM_SKIP_COMPILE (current_cpu, sc, 1);
+
+ /* Emit code to finish executing the semantics
+ (write back the results). */
+ emit_par_finish (current_cpu, pc, sc + 2, sc, id, sc + 1, id2);
+
+ return id;
+}
+
+static INLINE const IDESC *
+emit_full_parallel (SIM_CPU *current_cpu, PCADDR pc, CGEN_INSN_INT insn,
+ SCACHE *sc, int trace_p, int profile_p)
+{
+ const IDESC *id,*id2;
+
+ /* Emit both insns, then emit a finisher-upper.
+ We speed things up by handling the second insn serially
+ [not parallelly]. Then the writeback only has to deal
+ with the first insn. */
+ /* ??? Revisit to handle exceptions right. */
+
+ @cpu@_emit_before (current_cpu, sc, pc, 1);
+
+ /* FIXME: No need to handle this parallelly if second is nop. */
+ id = emit_16 (current_cpu, pc, insn >> 16, sc + 1, 0, 1);
+ sc[1].argbuf.trace_p = trace_p;
+ sc[1].argbuf.profile_p = profile_p;
+
+ @cpu@_emit_before (current_cpu, sc + 2, pc, 0);
+
+ /* Note that this can never be a cti. No cti's go in the S pipeline. */
+ id2 = emit_16 (current_cpu, pc + 2, insn & 0x7fff, sc + 3, 0, 0);
+ sc[3].argbuf.trace_p = trace_p;
+ sc[3].argbuf.profile_p = profile_p;
+
+ /* Set sc/snc insns notion of where to skip to. */
+ if (IDESC_SKIP_P (id))
+ SEM_SKIP_COMPILE (current_cpu, sc, 4);
+
+ /* Emit code to finish executing the semantics
+ (write back the results). */
+ emit_par_finish (current_cpu, pc, sc + 4, sc + 1, id, sc + 3, id2);
+
+ @cpu@_emit_after (current_cpu, sc + 5, pc);
+
+ return id;
+}
+
+static INLINE const IDESC *
+emit_32 (SIM_CPU *current_cpu, PCADDR pc, CGEN_INSN_INT insn,
+ SCACHE *sc, int fast_p)
+{
+ ARGBUF *abuf = &sc->argbuf;
+ const IDESC *id = @cpu@_decode (current_cpu, pc,
+ (USI) insn >> 16, insn, abuf);
+
+ @cpu@_fill_argbuf (current_cpu, abuf, id, pc, fast_p);
+ return id;
+}
+
+static INLINE const IDESC *
+emit_full32 (SIM_CPU *current_cpu, PCADDR pc, CGEN_INSN_INT insn, SCACHE *sc,
+ int trace_p, int profile_p)
+{
+ const IDESC *id;
+
+ @cpu@_emit_before (current_cpu, sc, pc, 1);
+ id = emit_32 (current_cpu, pc, insn, sc + 1, 0);
+ @cpu@_emit_after (current_cpu, sc + 2, pc);
+ sc[1].argbuf.trace_p = trace_p;
+ sc[1].argbuf.profile_p = profile_p;
+ return id;
+}
+
+EOF
+
+;;
+
+xinit)
+
+# Nothing needed.
+
+;;
+
+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
+{
+ const IDESC *idesc;
+ int icount = 0;
+
+ if ((pc & 3) != 0)
+ {
+ /* This occurs when single stepping and when compiling the not-taken
+ part of conditional branches. */
+ UHI insn = GETIMEMUHI (current_cpu, pc);
+ int trace_p = PC_IN_TRACE_RANGE_P (current_cpu, pc);
+ int profile_p = PC_IN_PROFILE_RANGE_P (current_cpu, pc);
+ SCACHE *cti_sc; /* ??? tmp hack */
+
+ /* A parallel insn isn't allowed here, but we don't mind nops.
+ ??? We need to wait until the insn is executed before signalling
+ the error, for situations where such signalling is wanted. */
+#if 0
+ if ((insn & 0x8000) != 0
+ && (insn & 0x7fff) != 0x7000) /* parallel nops are ok */
+ sim_engine_invalid_insn (current_cpu, pc, 0);
+#endif
+
+ /* Only emit before/after handlers if necessary. */
+ if (FAST_P || (! trace_p && ! profile_p))
+ {
+ idesc = emit_16 (current_cpu, pc, insn & 0x7fff, sc, FAST_P, 0);
+ cti_sc = sc;
+ ++sc;
+ --max_insns;
+ }
+ else
+ {
+ idesc = emit_full16 (current_cpu, pc, insn & 0x7fff, sc,
+ trace_p, profile_p);
+ cti_sc = sc + 1;
+ sc += 3;
+ max_insns -= 3;
+ }
+ ++icount;
+ pc += 2;
+ if (IDESC_CTI_P (idesc))
+ {
+ SET_CTI_VPC (cti_sc);
+ goto Finish;
+ }
+ }
+
+ /* There are two copies of the compiler: full(!fast) and fast.
+ The "full" case emits before/after handlers for each insn.
+ Having two copies of this code is a tradeoff, having one copy
+ seemed a bit more difficult to read (due to constantly testing
+ FAST_P). ??? On the other hand, with address ranges we'll want to
+ omit before/after handlers for unwanted insns. Having separate loops
+ for FAST/!FAST avoids constantly doing the test in the loop, but
+ typically FAST_P is a constant and such tests will get optimized out. */
+
+ if (FAST_P)
+ {
+ while (max_insns > 0)
+ {
+ USI insn = GETIMEMUSI (current_cpu, pc);
+ if ((SI) insn < 0)
+ {
+ /* 32 bit insn */
+ idesc = emit_32 (current_cpu, pc, insn, sc, 1);
+ ++sc;
+ --max_insns;
+ ++icount;
+ pc += 4;
+ if (IDESC_CTI_P (idesc))
+ {
+ SET_CTI_VPC (sc - 1);
+ break;
+ }
+ }
+ else
+ {
+ if ((insn & 0x8000) != 0) /* parallel? */
+ {
+ /* Yep. Here's the "interesting" [sic] part. */
+ idesc = emit_parallel (current_cpu, pc, insn, sc, 1);
+ sc += 3;
+ max_insns -= 3;
+ icount += 2;
+ pc += 4;
+ if (IDESC_CTI_P (idesc))
+ {
+ SET_CTI_VPC (sc - 3);
+ break;
+ }
+ }
+ else /* 2 serial 16 bit insns */
+ {
+ idesc = emit_16 (current_cpu, pc, insn >> 16, sc, 1, 0);
+ ++sc;
+ --max_insns;
+ ++icount;
+ pc += 2;
+ if (IDESC_CTI_P (idesc))
+ {
+ SET_CTI_VPC (sc - 1);
+ break;
+ }
+ /* While we're guaranteed that there's room to extract the
+ insn, when single stepping we can't; the pbb must stop
+ after the first insn. */
+ if (max_insns == 0)
+ break;
+ idesc = emit_16 (current_cpu, pc, insn & 0x7fff, sc, 1, 0);
+ ++sc;
+ --max_insns;
+ ++icount;
+ pc += 2;
+ if (IDESC_CTI_P (idesc))
+ {
+ SET_CTI_VPC (sc - 1);
+ break;
+ }
+ }
+ }
+ }
+ }
+ else /* ! FAST_P */
+ {
+ while (max_insns > 0)
+ {
+ USI insn = GETIMEMUSI (current_cpu, pc);
+ int trace_p = PC_IN_TRACE_RANGE_P (current_cpu, pc);
+ int profile_p = PC_IN_PROFILE_RANGE_P (current_cpu, pc);
+ SCACHE *cti_sc; /* ??? tmp hack */
+ if ((SI) insn < 0)
+ {
+ /* 32 bit insn
+ Only emit before/after handlers if necessary. */
+ if (trace_p || profile_p)
+ {
+ idesc = emit_full32 (current_cpu, pc, insn, sc,
+ trace_p, profile_p);
+ cti_sc = sc + 1;
+ sc += 3;
+ max_insns -= 3;
+ }
+ else
+ {
+ idesc = emit_32 (current_cpu, pc, insn, sc, 0);
+ cti_sc = sc;
+ ++sc;
+ --max_insns;
+ }
+ ++icount;
+ pc += 4;
+ if (IDESC_CTI_P (idesc))
+ {
+ SET_CTI_VPC (cti_sc);
+ break;
+ }
+ }
+ else
+ {
+ if ((insn & 0x8000) != 0) /* parallel? */
+ {
+ /* Yep. Here's the "interesting" [sic] part.
+ Only emit before/after handlers if necessary. */
+ if (trace_p || profile_p)
+ {
+ idesc = emit_full_parallel (current_cpu, pc, insn, sc,
+ trace_p, profile_p);
+ cti_sc = sc + 1;
+ sc += 6;
+ max_insns -= 6;
+ }
+ else
+ {
+ idesc = emit_parallel (current_cpu, pc, insn, sc, 0);
+ cti_sc = sc;
+ sc += 3;
+ max_insns -= 3;
+ }
+ icount += 2;
+ pc += 4;
+ if (IDESC_CTI_P (idesc))
+ {
+ SET_CTI_VPC (cti_sc);
+ break;
+ }
+ }
+ else /* 2 serial 16 bit insns */
+ {
+ /* Only emit before/after handlers if necessary. */
+ if (trace_p || profile_p)
+ {
+ idesc = emit_full16 (current_cpu, pc, insn >> 16, sc,
+ trace_p, profile_p);
+ cti_sc = sc + 1;
+ sc += 3;
+ max_insns -= 3;
+ }
+ else
+ {
+ idesc = emit_16 (current_cpu, pc, insn >> 16, sc, 0, 0);
+ cti_sc = sc;
+ ++sc;
+ --max_insns;
+ }
+ ++icount;
+ pc += 2;
+ if (IDESC_CTI_P (idesc))
+ {
+ SET_CTI_VPC (cti_sc);
+ break;
+ }
+ /* While we're guaranteed that there's room to extract the
+ insn, when single stepping we can't; the pbb must stop
+ after the first insn. */
+ if (max_insns <= 0)
+ break;
+ /* Use the same trace/profile address for the 2nd insn.
+ Saves us having to compute it and they come in pairs
+ anyway (e.g. can never branch to the 2nd insn). */
+ if (trace_p || profile_p)
+ {
+ idesc = emit_full16 (current_cpu, pc, insn & 0x7fff, sc,
+ trace_p, profile_p);
+ cti_sc = sc + 1;
+ sc += 3;
+ max_insns -= 3;
+ }
+ else
+ {
+ idesc = emit_16 (current_cpu, pc, insn & 0x7fff, sc, 0, 0);
+ cti_sc = sc;
+ ++sc;
+ --max_insns;
+ }
+ ++icount;
+ pc += 2;
+ if (IDESC_CTI_P (idesc))
+ {
+ SET_CTI_VPC (cti_sc);
+ break;
+ }
+ }
+ }
+ }
+ }
+
+ Finish:
+ SET_INSN_COUNT (icount);
+}
+EOF
+
+;;
+
+xfull-exec-pbb)
+
+# Inputs: current_cpu, vpc, FAST_P
+# Outputs: vpc
+# vpc is the virtual program counter.
+
+cat <<EOF
+#define DEFINE_SWITCH
+#include "sem2-switch.c"
+EOF
+
+;;
+
+*)
+ echo "Invalid argument to mainloop.in: $1" >&2
+ exit 1
+ ;;
+
+esac
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