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