sim/tic80/interp.c

   1 /*  This file is part of the GDB simulators.
   2
   3     Copyright (C) 1997, Free Software Foundation
   4     Condtributed by Cyngnus Solutions.
   5
   6     This program is free software; you can redistribute it and/or modify
   7     it under the terms of the GNU General Public License as published by
   8     the Free Software Foundation; either version 2 of the License, or
   9     (at your option) any later version.
  10
  11     This program is distributed in the hope that it will be useful,
  12     but WITHOUT ANY WARRANTY; without even the implied warranty of
  13     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14     GNU General Public License for more details.
  15
  16     You should have received a copy of the GNU General Public License
  17     along with this program; if not, write to the Free Software
  18     Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
  19
  20     */
  21
  22
  23
  24 #include "sim-main.h"
  25
  26 #include "idecode.h"
  27
  28 #include <signal.h>
  29
  30 void
  31 engine_init (SIM_DESC sd)
  32 {
  33   memset (&STATE_CPU (sd, 0)->reg, 0, sizeof STATE_CPU (sd, 0)->reg);
  34   memset (&STATE_CPU (sd, 0)->cia, 0, sizeof STATE_CPU (sd, 0)->cia);
  35   CPU_STATE (STATE_CPU (sd, 0)) = sd;
  36 }
  37
  38
  39 /* Mechanisms for stopping/restarting the simulation */
  40
  41 void
  42 engine_error (SIM_DESC sd,
  43               instruction_address cia,
  44               const char *fmt,
  45               ...)
  46 {
  47   va_list ap;
  48   va_start (ap, fmt);
  49   sim_io_evprintf (sd, fmt, ap);
  50   va_end (ap);
  51
  52   if (sd->halt_ok)
  53     {
  54       sim_io_printf (sd, "\n");
  55       engine_halt (sd, cia, sim_signalled, SIGABRT);
  56     }
  57   else
  58     sim_io_error (sd, " - aborting simulation");
  59 }
  60
  61 void
  62 engine_halt (SIM_DESC sd,
  63              instruction_address cia,
  64              enum sim_stop reason,
  65              int siggnal)
  66 {
  67   if (!sd->halt_ok)
  68     sim_io_error (sd, "engine_halt - bad longjmp");
  69   sd->reason = reason;
  70   sd->siggnal = siggnal;
  71   sd->halt_ok = 0;
  72   sd->restart_ok = 0;
  73   sd->cpu.cia = cia;
  74   longjmp (sd->path_to_halt, 1);
  75 }
  76
  77 void
  78 engine_restart (SIM_DESC sd,
  79                 instruction_address cia)
  80 {
  81   if (!sd->restart_ok)
  82     sim_io_error (sd, "engine_restart - bad longjmp");
  83   sd->restart_ok = 0;
  84   sd->cpu.cia = cia;
  85   longjmp(sd->path_to_restart, 1);
  86 }
  87
  88
  89 void
  90 engine_run_until_stop (SIM_DESC sd,
  91                        volatile int *keep_running)
  92 {
  93   if (!setjmp (sd->path_to_halt))
  94     {
  95       instruction_address cia;
  96       sd->halt_ok = 1;
  97       setjmp (sd->path_to_restart);
  98       sd->restart_ok = 1;
  99       cia = STATE_CPU (sd, 0)->cia;
 100       do
 101         {
 102           if (cia.ip == -1)
 103             {
 104               /* anulled instruction */
 105               cia.ip = cia.dp;
 106               cia.dp = cia.dp + sizeof (instruction_word);
 107             }
 108           else
 109             {
 110               instruction_word insn = IMEM (cia.ip);
 111               cia = idecode_issue (sd, insn, cia);
 112             }
 113         }
 114       while (*keep_running);
 115       engine_halt (sd, cia, sim_stopped, SIGINT);
 116     }
 117 }