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/* Generic simulator halt/resume.
Copyright (C) 1997-2021 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) CPU_PC_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_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_PRINTF (4, 0) 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);
#endif
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