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/* This file is part of the GDB simulators.
Copyright (C) 1997, Free Software Foundation
Condtributed by Cyngnus Solutions.
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 of the License, 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.
*/
#include "sim-main.h"
#include "idecode.h"
#include "itable.h"
#include <signal.h>
#ifdef HAVE_STRING_H
#include <string.h>
#else
#ifdef HAVE_STRINGS_H
#include <strings.h>
#endif
#endif
void
engine_init (SIM_DESC sd)
{
memset (&STATE_CPU (sd, 0)->reg, 0, sizeof STATE_CPU (sd, 0)->reg);
memset (&STATE_CPU (sd, 0)->cia, 0, sizeof STATE_CPU (sd, 0)->cia);
CPU_STATE (STATE_CPU (sd, 0)) = sd;
}
/* Mechanisms for stopping/restarting the simulation */
void
engine_error (SIM_DESC sd,
sim_cpu *cpu,
instruction_address cia,
const char *fmt,
...)
{
va_list ap;
va_start (ap, fmt);
sim_io_evprintf (sd, fmt, ap);
va_end (ap);
if (sd->halt_ok)
{
sim_io_eprintf (sd, "\n");
engine_halt (sd, cpu, cia, sim_stopped, SIGABRT);
}
else
sim_io_error (sd, " - aborting simulation");
}
void
engine_halt (SIM_DESC sd,
sim_cpu *cpu,
instruction_address cia,
enum sim_stop reason,
int siggnal)
{
if (!sd->halt_ok)
sim_io_error (sd, "engine_halt - bad longjmp");
sd->reason = reason;
sd->siggnal = siggnal;
sd->halt_ok = 0;
sd->restart_ok = 0;
if (cpu != NULL)
cpu->cia = cia;
longjmp (sd->path_to_halt, 1);
}
void
engine_restart (SIM_DESC sd,
sim_cpu *cpu,
instruction_address cia)
{
if (!sd->restart_ok)
sim_io_error (sd, "engine_restart - bad longjmp");
sd->restart_ok = 0;
cpu->cia = cia;
longjmp(sd->path_to_restart, 1);
}
void
engine_run_until_stop (SIM_DESC sd,
volatile int *keep_running)
{
if (!setjmp (sd->path_to_halt))
{
instruction_address cia;
sim_cpu *cpu = STATE_CPU (sd, 0);
sd->halt_ok = 1;
setjmp (sd->path_to_restart);
sd->restart_ok = 1;
cia = cpu->cia;
do
{
instruction_word insn = IMEM (cia);
cia = idecode_issue (sd, insn, cia);
}
while (*keep_running);
engine_halt (sd, cpu, cia, sim_stopped, SIGINT);
}
}
void
engine_step (SIM_DESC sd)
{
if (!setjmp (sd->path_to_halt))
{
instruction_address cia;
instruction_word insn;
sim_cpu *cpu = STATE_CPU (sd, 0);
sd->halt_ok = 1;
setjmp (sd->path_to_restart);
sd->restart_ok = 1;
cia = cpu->cia;
insn = IMEM (cia);
cia = idecode_issue (sd, insn, cia);
engine_halt (sd, cpu, cia, sim_stopped, SIGTRAP);
}
}
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