sim/common/sim-resume.c

   1 /* Generic simulator resume.
   2    Copyright (C) 1997-2020 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
  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
  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 }