1/* Generic simulator resume.
2   Copyright (C) 1997, 2007, 2008, 2009, 2010, 2011
3   Free Software Foundation, Inc.
4   Contributed by Cygnus Support.
5
6This file is part of GDB, the GNU debugger.
7
8This program is free software; you can redistribute it and/or modify
9it under the terms of the GNU General Public License as published by
10the Free Software Foundation; either version 3 of the License, or
11(at your option) any later version.
12
13This program is distributed in the hope that it will be useful,
14but WITHOUT ANY WARRANTY; without even the implied warranty of
15MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
16GNU General Public License for more details.
17
18You should have received a copy of the GNU General Public License
19along with this program.  If not, see <http://www.gnu.org/licenses/>.  */
20
21#include "sim-main.h"
22#include "sim-assert.h"
23
24/* Halt the simulator after just one instruction */
25
26static void
27has_stepped (SIM_DESC sd,
28	     void *data)
29{
30  ASSERT (STATE_MAGIC (sd) == SIM_MAGIC_NUMBER);
31  sim_engine_halt (sd, NULL, NULL, NULL_CIA, sim_stopped, SIM_SIGTRAP);
32}
33
34
35/* Generic resume - assumes the existance of sim_engine_run */
36
37void
38sim_resume (SIM_DESC sd,
39	    int step,
40	    int siggnal)
41{
42  sim_engine *engine = STATE_ENGINE (sd);
43  jmp_buf buf;
44  int jmpval;
45
46  ASSERT (STATE_MAGIC (sd) == SIM_MAGIC_NUMBER);
47
48  /* we only want to be single stepping the simulator once */
49  if (engine->stepper != NULL)
50    {
51      sim_events_deschedule (sd, engine->stepper);
52      engine->stepper = NULL;
53    }
54  if (step)
55    engine->stepper = sim_events_schedule (sd, 1, has_stepped, sd);
56
57  sim_module_resume (sd);
58
59  /* run/resume the simulator */
60  engine->jmpbuf = &buf;
61  jmpval = setjmp (buf);
62  if (jmpval == sim_engine_start_jmpval
63      || jmpval == sim_engine_restart_jmpval)
64    {
65      int last_cpu_nr = sim_engine_last_cpu_nr (sd);
66      int next_cpu_nr = sim_engine_next_cpu_nr (sd);
67      int nr_cpus = sim_engine_nr_cpus (sd);
68      int sig_to_deliver;
69
70      sim_events_preprocess (sd, last_cpu_nr >= nr_cpus, next_cpu_nr >= nr_cpus);
71      if (next_cpu_nr >= nr_cpus)
72	next_cpu_nr = 0;
73
74      /* Only deliver the SIGGNAL [sic] the first time through - don't
75         re-deliver any SIGGNAL during a restart.  NOTE: A new local
76         variable is used to avoid problems with the automatic
77         variable ``siggnal'' being trashed by a long jump.  */
78      if (jmpval == sim_engine_start_jmpval)
79	sig_to_deliver = siggnal;
80      else
81	sig_to_deliver = 0;
82
83#ifdef SIM_CPU_EXCEPTION_RESUME
84      {
85	sim_cpu* cpu = STATE_CPU (sd, next_cpu_nr);
86	SIM_CPU_EXCEPTION_RESUME(sd, cpu, sig_to_deliver);
87      }
88#endif
89
90      sim_engine_run (sd, next_cpu_nr, nr_cpus, sig_to_deliver);
91    }
92  engine->jmpbuf = NULL;
93
94  sim_module_suspend (sd);
95}
96