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[/] [openrisc/] [trunk/] [gnu-stable/] [gdb-7.2/] [sim/] [common/] [sim-events.h] - Blame information for rev 330

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1 330 jeremybenn
/* The common simulator framework for GDB, the GNU Debugger.
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   Copyright 2002, 2007, 2008, 2009, 2010 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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  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_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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