Initial creation of sourceware repositorygdb-4_18-branchpoint

1 files changed, 271 insertions, 0 deletions

diff --git a/sim/common/sim-events.h b/sim/common/sim-events.h
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+/*  This file is part of the program psim.
+
+    Copyright (C) 1994-1997, Andrew Cagney <cagney@highland.com.au>
+
+    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 2 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, write to the Free Software
+    Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
+ 
+    */
+
+
+#ifndef SIM_EVENTS_H
+#define SIM_EVENTS_H
+
+
+/* Notes:
+
+   When scheduling an event, the a delta of zero/one refers to the
+   timeline as follows:
+
+   epoch   0|1              1|2              2|3              3|
+   **queue**|--insn--|*queue*|--insn--|*queue*|--insn--|*queue*|
+     |   ^               ^        |       ^                ^
+     `- +0 ------------ +1 --..   `----- +0 ------------- +1 --..
+
+   When the queue is initialized, the time is set to zero with a
+   number of initialization events scheduled.  Consequently, as also
+   illustrated above, the event queue should be processed before the
+   first instruction.  That instruction being executed during tick 1.
+
+   The simulator main loop may take a form similar to:
+
+       if (halt-/restart-setjmp)
+         {
+
+	   .... // Determine who should go next
+	   last-cpu-nr = get-last-cpu-nr (sd);
+	   next-cpu-nr = get-next-cpu-nr (sd);
+	   events-were-last? = (last-cpu-nr >= nr-cpus);
+	   events-were-next? = (next-cpu-nr >= nr-cpus);
+
+           .... // process any outstanding events
+           sim_events_preprocess (sd, events-were-last?, events-were-next?);
+	   if (events-were-next)
+	     next-cpu-nr = 0;
+
+           .... // prime main loop 
+
+           while (1)
+             {
+	        .... // model one insn of next-cpu-nr .. nr-cpus
+                if (sim_events_tick (sd))
+	          sim_events_process (sd);
+                next-cpu-nr = 0
+	     }
+         }
+
+   NB.  In the above pseudo code it is assumed that any cpu-nr >=
+   nr-cpus is a marker for the event queue. */
+
+
+typedef void sim_event_handler(SIM_DESC sd, void *data);
+
+typedef struct _sim_event sim_event;
+
+typedef struct _sim_events sim_events;
+struct _sim_events {
+  int nr_ticks_to_process;
+  sim_event *queue;
+  sim_event *watchpoints;
+  sim_event *watchedpoints;
+  sim_event *free_list;
+  /* flag additional work needed */
+  volatile int work_pending;
+  /* the asynchronous event queue */
+#ifndef MAX_NR_SIGNAL_SIM_EVENTS
+#define MAX_NR_SIGNAL_SIM_EVENTS 2
+#endif
+  sim_event *held;
+  volatile int nr_held;
+  /* timekeeping */
+  unsigned long elapsed_wallclock;
+  SIM_ELAPSED_TIME resume_wallclock;
+  signed64 time_of_event;
+  int time_from_event;
+  int trace;
+};
+
+
+
+/* Install the "events" module.  */
+
+extern SIM_RC sim_events_install (SIM_DESC sd);
+
+
+/* Schedule an event DELTA_TIME ticks into the future */
+
+extern sim_event *sim_events_schedule
+(SIM_DESC sd,
+ signed64 delta_time,
+ sim_event_handler *handler,
+ void *data);
+
+extern sim_event *sim_events_schedule_tracef
+(SIM_DESC sd,
+ signed64 delta_time,
+ sim_event_handler *handler,
+ void *data,
+ const char *fmt,
+ ...) __attribute__ ((format (printf, 5, 6)));
+
+extern sim_event *sim_events_schedule_vtracef
+(SIM_DESC sd,
+ signed64 delta_time,
+ sim_event_handler *handler,
+ void *data,
+ const char *fmt,
+ va_list ap);
+
+
+extern void sim_events_schedule_after_signal
+(SIM_DESC sd,
+ signed64 delta_time,
+ sim_event_handler *handler,
+ void *data);
+
+/* NB: signal level events can't have trace strings as malloc isn't
+   available */
+
+
+
+/* Schedule an event milli-seconds from NOW.  The exact interpretation
+   of wallclock is host dependant. */
+
+extern sim_event *sim_events_watch_clock
+(SIM_DESC sd,
+ unsigned delta_ms_time,
+ sim_event_handler *handler,
+ void *data);
+
+
+/* Schedule an event when the test (IS_WITHIN == (VAL >= LB && VAL <=
+   UB)) of the NR_BYTES value at HOST_ADDR with BYTE_ORDER endian is
+   true.
+
+   HOST_ADDR: pointer into the host address space.
+   BYTE_ORDER: 0 - host endian; BIG_ENDIAN; LITTLE_ENDIAN */
+
+extern sim_event *sim_events_watch_sim
+(SIM_DESC sd,
+ void *host_addr,
+ int nr_bytes,
+ int byte_order,
+ int is_within,
+ unsigned64 lb,
+ unsigned64 ub,
+ sim_event_handler *handler,
+ void *data);
+
+
+/* Schedule an event when the test (IS_WITHIN == (VAL >= LB && VAL <=
+   UB)) of the NR_BYTES value at CORE_ADDR in BYTE_ORDER endian is
+   true.
+
+   CORE_ADDR/MAP: pointer into the target address space.
+   BYTE_ORDER: 0 - current target endian; BIG_ENDIAN; LITTLE_ENDIAN */
+
+extern sim_event *sim_events_watch_core
+(SIM_DESC sd,
+ address_word core_addr,
+ unsigned map,
+ int nr_bytes,
+ int byte_order,
+ int is_within,
+ unsigned64 lb,
+ unsigned64 ub,
+ sim_event_handler *handler,
+ void *data);
+
+/* Deschedule the specified event */
+
+extern void sim_events_deschedule
+(SIM_DESC sd,
+ sim_event *event_to_remove);
+
+
+/* Prepare for main simulator loop.  Ensure that the next thing to do
+   is not event processing.
+
+   If the simulator halted part way through event processing then both
+   EVENTS_WERE_LAST and EVENTS_WERE_NEXT shall be true.
+
+   If the simulator halted after processing the last cpu, then only
+   EVENTS_WERE_NEXT shall be true. */
+
+INLINE_SIM_EVENTS\
+(void) sim_events_preprocess
+(SIM_DESC sd,
+ int events_were_last,
+ int events_were_next);
+
+
+/* Progress time.
+
+   Separated into two parts so that the main loop can save its context
+   before the event queue is processed.  When sim_events_tick*()
+   returns true, any simulation context should be saved and
+   sim_events_process() called.
+
+   SIM_EVENTS_TICK advances the clock by 1 cycle.
+
+   SIM_EVENTS_TICKN advances the clock by N cycles (1..MAXINT). */
+
+INLINE_SIM_EVENTS\
+(int) sim_events_tick
+(SIM_DESC sd);
+
+INLINE_SIM_EVENTS\
+(int) sim_events_tickn
+(SIM_DESC sd,
+ int n);
+
+INLINE_SIM_EVENTS\
+(void) sim_events_process
+(SIM_DESC sd);
+
+
+/* Advance the clock by an additional SLIP cycles at the next call to
+   sim_events_tick*().  For multiple calls, the effect is
+   accumulative. */
+
+INLINE_SIM_EVENTS\
+(void) sim_events_slip
+(SIM_DESC sd,
+ int slip);
+
+
+/* Progress time such that an event shall occure upon the next call to
+   sim_events tick */
+
+#if 0
+INLINE_SIM_EVENTS\
+(void) sim_events_timewarp
+(SIM_DESC sd);
+#endif
+
+
+/* local concept of elapsed target time */
+
+INLINE_SIM_EVENTS\
+(signed64) sim_events_time
+(SIM_DESC sd);
+
+
+/* local concept of elapsed host time (milliseconds) */
+
+INLINE_SIM_EVENTS\
+(unsigned long) sim_events_elapsed_time
+(SIM_DESC sd);
+
+#endif