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 #include "itable.h"
  28
  29 #include <signal.h>
  30
  31 #ifdef HAVE_STRING_H
  32 #include <string.h>
  33 #else
  34 #ifdef HAVE_STRINGS_H
  35 #include <strings.h>
  36 #endif
  37 #endif
  38
  39 void
  40 engine_init (SIM_DESC sd)
  41 {
  42   memset (&STATE_CPU (sd, 0)->reg, 0, sizeof STATE_CPU (sd, 0)->reg);
  43   memset (&STATE_CPU (sd, 0)->cia, 0, sizeof STATE_CPU (sd, 0)->cia);
  44   CPU_STATE (STATE_CPU (sd, 0)) = sd;
  45 }
  46
  47
  48 /* Mechanisms for stopping/restarting the simulation */
  49
  50 void
  51 engine_error (SIM_DESC sd,
  52               sim_cpu *cpu,
  53               instruction_address cia,
  54               const char *fmt,
  55               ...)
  56 {
  57   va_list ap;
  58   va_start (ap, fmt);
  59   sim_io_evprintf (sd, fmt, ap);
  60   va_end (ap);
  61
  62   if (sd->halt_ok)
  63     {
  64       sim_io_eprintf (sd, "\n");
  65       engine_halt (sd, cpu, cia, sim_stopped, SIGABRT);
  66     }
  67   else
  68     sim_io_error (sd, " - aborting simulation");
  69 }
  70
  71 void
  72 engine_halt (SIM_DESC sd,
  73              sim_cpu *cpu,
  74              instruction_address cia,
  75              enum sim_stop reason,
  76              int siggnal)
  77 {
  78   if (!sd->halt_ok)
  79     sim_io_error (sd, "engine_halt - bad longjmp");
  80   sd->reason = reason;
  81   sd->siggnal = siggnal;
  82   sd->halt_ok = 0;
  83   sd->restart_ok = 0;
  84   if (cpu != NULL)
  85     cpu->cia = cia;
  86   longjmp (sd->path_to_halt, 1);
  87 }
  88
  89 void
  90 engine_restart (SIM_DESC sd,
  91                 sim_cpu *cpu,
  92                 instruction_address cia)
  93 {
  94   if (!sd->restart_ok)
  95     sim_io_error (sd, "engine_restart - bad longjmp");
  96   sd->restart_ok = 0;
  97   cpu->cia = cia;
  98   longjmp(sd->path_to_restart, 1);
  99 }
 100
 101
 102 void
 103 engine_run_until_stop (SIM_DESC sd,
 104                        volatile int *keep_running)
 105 {
 106   if (!setjmp (sd->path_to_halt))
 107     {
 108       instruction_address cia;
 109       sim_cpu *cpu = STATE_CPU (sd, 0);
 110       sd->halt_ok = 1;
 111       setjmp (sd->path_to_restart);
 112       sd->restart_ok = 1;
 113       cia = cpu->cia;
 114       do
 115         {
 116           instruction_word insn = IMEM (cia);
 117           cia = idecode_issue (sd, insn, cia);
 118         }
 119       while (*keep_running);
 120       engine_halt (sd, cpu, cia, sim_stopped, SIGINT);
 121     }
 122 }
 123
 124
 125 void
 126 engine_step (SIM_DESC sd)
 127 {
 128   if (!setjmp (sd->path_to_halt))
 129     {
 130       instruction_address cia;
 131       instruction_word insn;
 132       sim_cpu *cpu = STATE_CPU (sd, 0);
 133       sd->halt_ok = 1;
 134       setjmp (sd->path_to_restart);
 135       sd->restart_ok = 1;
 136       cia = cpu->cia;
 137       insn = IMEM (cia);
 138       cia = idecode_issue (sd, insn, cia);
 139       engine_halt (sd, cpu, cia, sim_stopped, SIGTRAP);
 140     }
 141 }