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