sim/common/genmloop.sh

   1 # This shell script emits a C file. -*- C -*-
   2 # Generate the main loop of the simulator.
   3 # Syntax: genmloop.sh mono|multi cpu mainloop.in
   4 # FIXME: "multi" support is wip.
   5
   6 type=$1
   7 cpu=$2
   8 file=$3
   9
  10 cat <<EOF
  11 /* This file is is generated by the genmloop script.  DO NOT EDIT! */
  12
  13 /* Main loop for CGEN-based simulators.
  14    Copyright (C) 1996, 1997 Free Software Foundation, Inc.
  15    Contributed by Cygnus Support.
  16
  17 This file is part of GDB, the GNU debugger.
  18
  19 This program is free software; you can redistribute it and/or modify
  20 it under the terms of the GNU General Public License as published by
  21 the Free Software Foundation; either version 2, or (at your option)
  22 any later version.
  23
  24 This program is distributed in the hope that it will be useful,
  25 but WITHOUT ANY WARRANTY; without even the implied warranty of
  26 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  27 GNU General Public License for more details.
  28
  29 You should have received a copy of the GNU General Public License along
  30 with this program; if not, write to the Free Software Foundation, Inc.,
  31 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.  */
  32
  33 /* We want the simcache version of SEM_ARG.  */
  34 #define SCACHE_P
  35
  36 #include "sim-main.h"
  37 #include "bfd.h"
  38 #include "mem-ops.h"
  39 #include "sem-ops.h"
  40 #include "cgen-scache.h"
  41 #include "cpu-opc.h"
  42 #include "cpu-sim.h"
  43
  44 /* Tell sim_main_loop to use the cache if it's active.
  45    Collecting profile data and tracing slow us down so we don't do them in
  46    "fast mode".
  47    There are 2 possibilities on 2 axes:
  48    - use or don't use the cache
  49    - run normally (full featured) or run fast
  50    Supporting all four possibilities in one executable is a bit much but
  51    supporting normal/fast seems reasonable.
  52    If the cache is configured in it is always used.
  53    ??? Need to see whether it speeds up profiling significantly or not.
  54    Speeding up tracing doesn't seem worth it.
  55    ??? Sometimes supporting more than one set of semantic functions will make
  56    the simulator too large - this should be configurable.
  57 */
  58
  59 #if WITH_SCACHE
  60 #define RUN_FAST_P(cpu) (STATE_RUN_FAST_P (CPU_STATE (cpu)))
  61 #else
  62 #define RUN_FAST_P(cpu) 0
  63 #endif
  64
  65 #ifndef SIM_PRE_EXEC_HOOK
  66 #define SIM_PRE_EXEC_HOOK(state)
  67 #endif
  68
  69 #ifndef SIM_POST_EXEC_HOOK
  70 #define SIM_POST_EXEC_HOOK(state)
  71 #endif
  72
  73 EOF
  74
  75 ${SHELL} $file support
  76
  77 cat <<EOF
  78
  79 static volatile int keep_running;
  80
  81 int
  82 engine_stop (SIM_DESC sd)
  83 {
  84   keep_running = 0;
  85   return 1;
  86 }
  87
  88 void
  89 engine_run (SIM_DESC sd, int step, int siggnal)
  90 {
  91   current_state = sd;
  92 #if WITH_SCACHE
  93   if (USING_SCACHE_P (sd))
  94     scache_flush (sd);
  95 #endif
  96   engine_resume (sd, step, siggnal);
  97 }
  98
  99 void
 100 engine_resume (SIM_DESC sd, int step, int siggnal)
 101 {
 102 #ifdef __STDC__
 103   /* These are volatile to survive setjmp/longjmp.
 104      This will slow down the simulation a teensy bit, but we want to
 105      measure simulator speed even in fast mode.  */
 106   volatile unsigned long insn_count;
 107   volatile SIM_ELAPSED_TIME start_time;
 108 #else
 109   /* ??? Not sure what to do for K&R C.  */
 110   static unsigned long insn_count;
 111   static SIM_ELAPSED_TIME start_time;
 112 #endif
 113   SIM_DESC current_state = sd;
 114   sim_cpu *current_cpu = STATE_CPU (sd, 0);
 115
 116   keep_running = 1;
 117   start_time = sim_elapsed_time_get ();
 118   insn_count = 0;
 119
 120   if (setjmp (STATE_HALT_JMP_BUF (sd)))
 121     {
 122       TRACE_INSN_FINI (current_cpu);
 123       PROFILE_EXEC_TIME (CPU_PROFILE_DATA (current_cpu))
 124         += sim_elapsed_time_since (start_time);
 125       PROFILE_TOTAL_INSN_COUNT (CPU_PROFILE_DATA (current_cpu))
 126         += insn_count;
 127       return;
 128     }
 129
 130 EOF
 131
 132 # Any initialization code before looping starts.
 133 ${SHELL} $file init
 134
 135 cat <<EOF
 136
 137   /* ??? Restart support to be added in time.  */
 138
 139   if (step
 140       || !RUN_FAST_P (current_cpu))
 141     {
 142       do
 143         {
 144 #define FAST 0 /* ??? Hopefully this name won't collide with anything.  */
 145           /* FIXME: Later check every insn for events and such.  */
 146
 147           SIM_PRE_EXEC_HOOK (current_cpu);
 148
 149 EOF
 150
 151 # Copy of main loop that uses the various compiled in features.
 152 # FIXME: May want more than one copy of this.
 153 ${SHELL} $file normal
 154
 155 cat <<EOF
 156
 157           SIM_POST_EXEC_HOOK (current_cpu);
 158
 159           ++insn_count;
 160           if (step)
 161             engine_halt (current_cpu, EXEC_STATE_STOPPED, SIM_SIGTRAP);
 162         }
 163       while (keep_running);
 164       /* If the loop exists, engine_stop was called.  */
 165       engine_halt (current_cpu, EXEC_STATE_STOPPED, SIM_SIGINT);
 166 #undef FAST
 167     }
 168   else
 169     {
 170       do
 171         {
 172 #define FAST 1
 173
 174 EOF
 175
 176 # Copy of main loop that is run purely for fast execution.
 177 ${SHELL} $file fast
 178
 179 cat <<EOF
 180
 181 #undef FAST
 182           ++insn_count;
 183         }
 184       while (keep_running);
 185       /* If the loop exists, engine_stop was called.  */
 186       engine_halt (current_cpu, EXEC_STATE_STOPPED, SIM_SIGINT);
 187     }
 188 }
 189 EOF