1 /* Generic simulator resume.
2 Copyright (C) 1997-2013 Free Software Foundation, Inc.
3 Contributed by Cygnus Support.
4
5 This file is part of GDB, the GNU debugger.
6
7 This program is free software; you can redistribute it and/or modify
8 it under the terms of the GNU General Public License as published by
9 the Free Software Foundation; either version 3 of the License, or
10 (at your option) any later version.
11
12 This program is distributed in the hope that it will be useful,
13 but WITHOUT ANY WARRANTY; without even the implied warranty of
14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 GNU General Public License for more details.
16
17 You should have received a copy of the GNU General Public License
18 along 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
25 static void
has_stepped(SIM_DESC sd,void * data)26 has_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
36 void
sim_resume(SIM_DESC sd,int step,int siggnal)37 sim_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