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/* Generic simulator halt/resume.

   Copyright (C) 1997, 1998, 2007, 2008, 2009, 2010

   Free Software Foundation, Inc.

   Contributed by Cygnus Support.

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 3 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, see <http://www.gnu.org/licenses/>.  */

#ifndef SIM_ENGINE_H

#define SIM_ENGINE_H

typedef struct _sim_engine sim_engine;

struct _sim_engine

{

  void *jmpbuf;

  sim_cpu *last_cpu;

  sim_cpu *next_cpu;

  int nr_cpus;

  enum sim_stop reason;

  sim_event *stepper;

  int sigrc;

};

/* jmpval: 0 (initial use) start simulator

           1               halt simulator

           2               restart simulator

   This is required by the ISO C standard (the only time 0 is returned

   is at the initial call to setjmp). */

enum {

  sim_engine_start_jmpval,

  sim_engine_halt_jmpval,

  sim_engine_restart_jmpval,

};

/* Get/set the run state of CPU to REASON/SIGRC.

   REASON/SIGRC are the values returned by sim_stop_reason.  */

void sim_engine_get_run_state (SIM_DESC sd, enum sim_stop *reason, int *sigrc);

void sim_engine_set_run_state (SIM_DESC sd, enum sim_stop reason, int sigrc);

/* Halt the simulator *now* */

extern void sim_engine_halt

(SIM_DESC sd,

 sim_cpu *last_cpu, /* NULL -> in event-mgr */

 sim_cpu *next_cpu, /* NULL -> succ (last_cpu) or event-mgr */

 sim_cia cia,

 enum sim_stop reason,

 int sigrc) __attribute__ ((noreturn));

/* Halt hook - allow target specific operation when halting a

   simulator */

#if !defined (SIM_ENGINE_HALT_HOOK)

#define SIM_ENGINE_HALT_HOOK(SD, LAST_CPU, CIA) \

if ((LAST_CPU) != NULL) CIA_SET (LAST_CPU, CIA)

#endif

/* NB: If a port uses the SIM_CPU_EXCEPTION_* hooks, the default

   SIM_ENGINE_HALT_HOOK and SIM_ENGINE_RESUME_HOOK must not be used.

   They conflict in that the PC set by the HALT_HOOK may overwrite the

   proper one, as intended to be saved by the EXCEPTION_TRIGGER

   hook. */

/* restart the simulator *now* */

extern void sim_engine_restart

(SIM_DESC sd,

 sim_cpu *last_cpu, /* NULL -> in event-mgr */

 sim_cpu *next_cpu, /* NULL -> succ (last_cpu) or event-mgr */

 sim_cia cia);

/* Restart hook - allow target specific operation when restarting a

   simulator */

#if !defined (SIM_ENGINE_RESTART_HOOK)

#define SIM_ENGINE_RESTART_HOOK(SD, LAST_CPU, CIA) SIM_ENGINE_HALT_HOOK(SD, LAST_CPU, CIA)

#endif

/* Abort the simulator *now*.

   This function is NULL safe.  It can be called when either of SD or

   CIA are NULL.

   This function is setjmp/longjmp safe.  It can be called when of

   the sim_engine setjmp/longjmp buffer has not been established.

   Simulators that are using components such as sim-core but are not

   yet using this sim-engine module should link in file sim-abort.o

   which implements a non setjmp/longjmp version of

   sim_engine_abort. */

extern void sim_engine_abort

(SIM_DESC sd,

 sim_cpu *cpu,

 sim_cia cia,

 const char *fmt,

 ...) __attribute__ ((format (printf, 4, 5))) __attribute__ ((noreturn));

extern void sim_engine_vabort

(SIM_DESC sd,

 sim_cpu *cpu,

 sim_cia cia,

 const char *fmt,

 va_list ap) __attribute__ ((noreturn));

/* No abort hook - when possible this function exits using the

   engine_halt function (and SIM_ENGINE_HALT_HOOK). */

/* Called by the generic sim_resume to run the simulation within the

   above safty net.

   An example implementation of sim_engine_run can be found in the

   file sim-run.c */

extern void sim_engine_run

(SIM_DESC sd,

 int next_cpu_nr,

 int nr_cpus,

 int siggnal); /* most simulators ignore siggnal */

/* Determine the state of next/last cpu when the simulator was last

   halted - a value >= MAX_NR_PROCESSORS indicates that the

   event-queue was next/last. */

extern int sim_engine_next_cpu_nr (SIM_DESC sd);

extern int sim_engine_last_cpu_nr (SIM_DESC sd);

extern int sim_engine_nr_cpus (SIM_DESC sd);

/* Establish the simulator engine */

MODULE_INSTALL_FN sim_engine_install;

#endif