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1d506c26d9
This commit is the result of the following actions:
- Running gdb/copyright.py to update all of the copyright headers to
include 2024,
- Manually updating a few files the copyright.py script told me to
update, these files had copyright headers embedded within the
file,
- Regenerating gdbsupport/Makefile.in to refresh it's copyright
date,
- Using grep to find other files that still mentioned 2023. If
these files were updated last year from 2022 to 2023 then I've
updated them this year to 2024.
I'm sure I've probably missed some dates. Feel free to fix them up as
you spot them.
294 lines
7.1 KiB
C
294 lines
7.1 KiB
C
/* The common simulator framework for GDB, the GNU Debugger.
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Copyright 2002-2024 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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#include <stdarg.h>
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#include "ansidecl.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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int64_t time_of_event;
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int64_t time_from_event;
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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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int64_t 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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int64_t 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_NULL_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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int64_t 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) ATTRIBUTE_NULL_PRINTF (5, 0);
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extern void sim_events_schedule_after_signal
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(SIM_DESC sd,
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int64_t 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 a PC matches a range. */
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extern sim_event *sim_events_watch_pc
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(SIM_DESC sd,
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int is_within,
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uint64_t lb,
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uint64_t 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 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: BFD_ENDIAN_UNKNOWN - host endian; BFD_ENDIAN_BIG;
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BFD_ENDIAN_LITTLE. */
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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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enum bfd_endian byte_order,
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int is_within,
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uint64_t lb,
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uint64_t 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: BFD_ENDIAN_UNKNOWN - host endian; BFD_ENDIAN_BIG;
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BFD_ENDIAN_LITTLE. */
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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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enum bfd_endian byte_order,
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int is_within,
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uint64_t lb,
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uint64_t 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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(int64_t) 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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(int64_t) sim_events_remain_time
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(SIM_DESC sd, sim_event *event);
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#endif
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