252 lines
6 KiB
C
252 lines
6 KiB
C
/* This file is part of the program psim.
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Copyright (C) 1994-1997, Andrew Cagney <cagney@highland.com.au>
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
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*/
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#ifndef _SIM_EVENTS_H_
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#define _SIM_EVENTS_H_
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/* Notes:
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When scheduling an event, the a delta of zero/one refers to the
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timeline as follows:
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epoch 0|1 1|2 2|3 3|
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**queue**|--insn--|*queue*|--insn--|*queue*|--insn--|*queue*|
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| ^ ^ | ^ ^
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`- +0 ------------ +1 --.. `----- +0 ------------- +1 --..
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When the queue is initialized, the time is set to zero with a
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number of initialization events scheduled. Consequently, as also
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illustrated above, the event queue should be processed before the
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first instruction. That instruction being executed during tick 1.
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The simulator main loop may take a form similar to:
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if (halt-/restart-setjmp)
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{
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.... // Determine who should go next
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last-cpu-nr = get-last-cpu-nr (sd);
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next-cpu-nr = get-next-cpu-nr (sd);
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events-were-last? = (last-cpu-nr >= nr-cpus);
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events-were-next? = (next-cpu-nr >= nr-cpus);
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.... // process any outstanding events
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sim_events_preprocess (sd, events-were-last?, events-were-next?);
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if (events-were-next)
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next-cpu-nr = 0;
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.... // prime main loop
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while (1)
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{
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.... // model one insn of next-cpu-nr .. nr-cpus
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if (sim_events_tick (sd))
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sim_events_process (sd);
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next-cpu-nr = 0
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}
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}
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NB. In the above pseudo code it is assumed that any cpu-nr >=
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nr-cpus is a marker for the event queue. */
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typedef void sim_event_handler(SIM_DESC sd, void *data);
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typedef struct _sim_event sim_event;
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typedef struct _sim_events sim_events;
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struct _sim_events {
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int nr_ticks_to_process;
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sim_event *queue;
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sim_event *watchpoints;
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sim_event *watchedpoints;
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sim_event *free_list;
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/* flag additional work needed */
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volatile int work_pending;
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/* the asynchronous event queue */
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#ifndef MAX_NR_SIGNAL_SIM_EVENTS
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#define MAX_NR_SIGNAL_SIM_EVENTS 2
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#endif
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sim_event *held;
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volatile int nr_held;
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/* timekeeping */
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SIM_ELAPSED_TIME initial_wallclock;
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signed64 time_of_event;
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int time_from_event;
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int trace;
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};
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/* Install the "events" module. */
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EXTERN_SIM_EVENTS\
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(SIM_RC) sim_events_install (SIM_DESC sd);
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/* Uninstall the "events" subsystem. */
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EXTERN_SIM_EVENTS\
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(void)
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sim_events_uninstall (SIM_DESC sd);
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/* Initialization */
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EXTERN_SIM_EVENTS\
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(SIM_RC) sim_events_init (SIM_DESC sd);
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/* Set Tracing Level */
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EXTERN_SIM_EVENTS\
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(void) sim_events_set_trace
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(SIM_DESC sd,
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int level);
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/* Schedule an event DELTA_TIME ticks into the future */
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EXTERN_SIM_EVENTS\
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(sim_event *) sim_events_schedule
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(SIM_DESC sd,
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signed64 delta_time,
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sim_event_handler *handler,
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void *data);
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EXTERN_SIM_EVENTS\
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(void) sim_events_schedule_after_signal
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(SIM_DESC sd,
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signed64 delta_time,
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sim_event_handler *handler,
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void *data);
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/* Schedule an event milli-seconds from NOW. The exact interpretation
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of wallclock is host dependant. */
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EXTERN_SIM_EVENTS\
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(sim_event *) sim_events_watch_clock
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(SIM_DESC sd,
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unsigned delta_ms_time,
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sim_event_handler *handler,
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void *data);
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/* Schedule an event when the NR_BYTES value at HOST_ADDR with
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BYTE_ORDER lies within LB..UB (unsigned).
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HOST_ADDR: pointer into the host address space.
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BYTE_ORDER: 0 - host endian; BIG_ENDIAN; LITTLE_ENDIAN */
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EXTERN_SIM_EVENTS\
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(sim_event*) sim_events_watch_sim
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(SIM_DESC sd,
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void *host_addr,
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int nr_bytes,
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int byte_order,
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unsigned64 lb,
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unsigned64 ub,
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sim_event_handler *handler,
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void *data);
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/* Schedule an event when the NR_BYTES value at CORE_ADDR with BYTE_ORDER
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lies between LB..UB.
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CORE_ADDR/MAP: pointer into the target address space.
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BYTE_ORDER: 0 - current target endian; BIG_ENDIAN; LITTLE_ENDIAN */
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EXTERN_SIM_EVENTS\
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(sim_event*) sim_events_watch_core
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(SIM_DESC sd,
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address_word core_addr,
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sim_core_maps core_map,
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int nr_bytes,
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int byte_order,
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unsigned64 lb,
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unsigned64 ub,
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sim_event_handler *handler,
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void *data);
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/* Deschedule the specified event */
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EXTERN_SIM_EVENTS\
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(void) sim_events_deschedule
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(SIM_DESC sd,
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sim_event *event_to_remove);
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/* Prepare for main simulator loop. Ensure that the next thing to do
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is not event processing.
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If the simulator halted part way through event processing then both
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EVENTS_WERE_LAST and EVENTS_WERE_FIRST shall be true.
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If the simulator halted after processing the last cpu, then only
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EVENTS_WERE_NEXT shall be true. */
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INLINE_SIM_EVENTS\
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(void) sim_events_preprocess
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(SIM_DESC sd,
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int events_were_last,
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int events_were_next);
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/* Progress time - separated into two parts so that the main loop can
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save its context before the event queue is processed.
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sim_events_tickn advances the clock by N cycles. */
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INLINE_SIM_EVENTS\
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(int) sim_events_tick
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(SIM_DESC sd);
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INLINE_SIM_EVENTS\
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(int) sim_events_tickn
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(SIM_DESC sd,
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unsigned n);
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INLINE_SIM_EVENTS\
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(void) sim_events_process
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(SIM_DESC sd);
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/* Progress time such that an event shall occure upon the next call to
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sim_events tick */
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#if 0
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INLINE_SIM_EVENTS\
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(void) sim_events_timewarp
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(SIM_DESC sd);
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#endif
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/* local concept of time */
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INLINE_SIM_EVENTS\
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(signed64) sim_events_time
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(SIM_DESC sd);
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#endif
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