278 lines
6.8 KiB
C
278 lines
6.8 KiB
C
/* The common simulator framework for GDB, the GNU Debugger.
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Copyright 2002-2015 Free Software Foundation, Inc.
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Contributed by Andrew Cagney and Red Hat.
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This file is part of GDB.
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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 3 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, see <http://www.gnu.org/licenses/>. */
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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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unsigned long elapsed_wallclock;
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SIM_ELAPSED_TIME resume_wallclock;
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signed64 time_of_event;
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signed64 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_RC sim_events_install (SIM_DESC sd);
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/* Schedule an event DELTA_TIME ticks into the future */
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extern 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_event *sim_events_schedule_tracef
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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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const char *fmt,
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...) __attribute__ ((format (printf, 5, 6)));
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extern sim_event *sim_events_schedule_vtracef
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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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const char *fmt,
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va_list ap);
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extern 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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/* NB: signal level events can't have trace strings as malloc isn't
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available */
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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_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 test (IS_WITHIN == (VAL >= LB && VAL <=
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UB)) of the NR_BYTES value at HOST_ADDR with BYTE_ORDER endian is
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true.
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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_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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int is_within,
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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 test (IS_WITHIN == (VAL >= LB && VAL <=
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UB)) of the NR_BYTES value at CORE_ADDR in BYTE_ORDER endian is
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true.
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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_event *sim_events_watch_core
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(SIM_DESC sd,
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address_word core_addr,
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unsigned map,
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int nr_bytes,
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int byte_order,
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int is_within,
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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 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_NEXT 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.
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Separated into two parts so that the main loop can save its context
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before the event queue is processed. When sim_events_tick*()
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returns true, any simulation context should be saved and
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sim_events_process() called.
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SIM_EVENTS_TICK advances the clock by 1 cycle.
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SIM_EVENTS_TICKN advances the clock by N cycles (1..MAXINT). */
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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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int 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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/* Advance the clock by an additional SLIP cycles at the next call to
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sim_events_tick*(). For multiple calls, the effect is
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accumulative. */
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INLINE_SIM_EVENTS\
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(void) sim_events_slip
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(SIM_DESC sd,
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int slip);
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/* Progress time such that an event shall occur 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 elapsed target 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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/* local concept of elapsed host time (milliseconds) */
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INLINE_SIM_EVENTS\
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(unsigned long) sim_events_elapsed_time
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(SIM_DESC sd);
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/* Returns the time that remains before the event is raised. */
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INLINE_SIM_EVENTS\
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(signed64) sim_events_remain_time
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(SIM_DESC sd, sim_event *event);
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#endif
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