sim/common/sim-resume.c

   1 /* Generic simulator resume.
   2    Copyright (C) 1997-2021 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 /* This must come before any other includes.  */
  21 #include "defs.h"
  22
  23 #include "sim-main.h"
  24 #include "sim-assert.h"
  25 #include "sim-signal.h"
  26
  27 /* Halt the simulator after just one instruction */
  28
  29 static void
  30 has_stepped (SIM_DESC sd,
  31              void *data)
  32 {
  33   ASSERT (STATE_MAGIC (sd) == SIM_MAGIC_NUMBER);
  34   sim_engine_halt (sd, NULL, NULL, NULL_CIA, sim_stopped, SIM_SIGTRAP);
  35 }
  36
  37
  38 /* Generic resume - assumes the existance of sim_engine_run */
  39
  40 void
  41 sim_resume (SIM_DESC sd,
  42             int step,
  43             int siggnal)
  44 {
  45   sim_engine *engine = STATE_ENGINE (sd);
  46   jmp_buf buf;
  47   int jmpval;
  48
  49   ASSERT (STATE_MAGIC (sd) == SIM_MAGIC_NUMBER);
  50
  51   /* we only want to be single stepping the simulator once */
  52   if (engine->stepper != NULL)
  53     {
  54       sim_events_deschedule (sd, engine->stepper);
  55       engine->stepper = NULL;
  56     }
  57   if (step)
  58     engine->stepper = sim_events_schedule (sd, 1, has_stepped, sd);
  59
  60   sim_module_resume (sd);
  61
  62   /* run/resume the simulator */
  63   engine->jmpbuf = &buf;
  64   jmpval = setjmp (buf);
  65   if (jmpval == sim_engine_start_jmpval
  66       || jmpval == sim_engine_restart_jmpval)
  67     {
  68       int last_cpu_nr = sim_engine_last_cpu_nr (sd);
  69       int next_cpu_nr = sim_engine_next_cpu_nr (sd);
  70       int nr_cpus = sim_engine_nr_cpus (sd);
  71       int sig_to_deliver;
  72
  73       sim_events_preprocess (sd, last_cpu_nr >= nr_cpus, next_cpu_nr >= nr_cpus);
  74       if (next_cpu_nr >= nr_cpus)
  75         next_cpu_nr = 0;
  76
  77       /* Only deliver the SIGGNAL [sic] the first time through - don't
  78          re-deliver any SIGGNAL during a restart.  NOTE: A new local
  79          variable is used to avoid problems with the automatic
  80          variable ``siggnal'' being trashed by a long jump.  */
  81       if (jmpval == sim_engine_start_jmpval)
  82         sig_to_deliver = siggnal;
  83       else
  84         sig_to_deliver = 0;
  85
  86 #ifdef SIM_CPU_EXCEPTION_RESUME
  87       {
  88         sim_cpu* cpu = STATE_CPU (sd, next_cpu_nr);
  89         SIM_CPU_EXCEPTION_RESUME (sd, cpu, sig_to_deliver);
  90       }
  91 #endif
  92
  93       sim_engine_run (sd, next_cpu_nr, nr_cpus, sig_to_deliver);
  94     }
  95   engine->jmpbuf = NULL;
  96
  97   sim_module_suspend (sd);
  98 }