gnu/dist/gdb6/sim/common/sim-resume.c

   1 /* Generic simulator resume.
   2    Copyright (C) 1997 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 2, or (at your option)
  10 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 along
  18 with this program; if not, write to the Free Software Foundation, Inc.,
  19 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.  */
  20
  21 #include "sim-main.h"
  22 #include "sim-assert.h"
  23
  24 /* Halt the simulator after just one instruction */
  25
  26 static void
  27 has_stepped (SIM_DESC sd,
  28              void *data)
  29 {
  30   ASSERT (STATE_MAGIC (sd) == SIM_MAGIC_NUMBER);
  31   sim_engine_halt (sd, NULL, NULL, NULL_CIA, sim_stopped, SIM_SIGTRAP);
  32 }
  33
  34
  35 /* Generic resume - assumes the existance of sim_engine_run */
  36
  37 void
  38 sim_resume (SIM_DESC sd,
  39             int step,
  40             int siggnal)
  41 {
  42   sim_engine *engine = STATE_ENGINE (sd);
  43   jmp_buf buf;
  44   int jmpval;
  45
  46   ASSERT (STATE_MAGIC (sd) == SIM_MAGIC_NUMBER);
  47
  48   /* we only want to be single stepping the simulator once */
  49   if (engine->stepper != NULL)
  50     {
  51       sim_events_deschedule (sd, engine->stepper);
  52       engine->stepper = NULL;
  53     }
  54   if (step)
  55     engine->stepper = sim_events_schedule (sd, 1, has_stepped, sd);
  56
  57   sim_module_resume (sd);
  58
  59   /* run/resume the simulator */
  60   engine->jmpbuf = &buf;
  61   jmpval = setjmp (buf);
  62   if (jmpval == sim_engine_start_jmpval
  63       || jmpval == sim_engine_restart_jmpval)
  64     {
  65       int last_cpu_nr = sim_engine_last_cpu_nr (sd);
  66       int next_cpu_nr = sim_engine_next_cpu_nr (sd);
  67       int nr_cpus = sim_engine_nr_cpus (sd);
  68       int sig_to_deliver;
  69
  70       sim_events_preprocess (sd, last_cpu_nr >= nr_cpus, next_cpu_nr >= nr_cpus);
  71       if (next_cpu_nr >= nr_cpus)
  72         next_cpu_nr = 0;
  73
  74       /* Only deliver the SIGGNAL [sic] the first time through - don't
  75          re-deliver any SIGGNAL during a restart.  NOTE: A new local
  76          variable is used to avoid problems with the automatic
  77          variable ``siggnal'' being trashed by a long jump.  */
  78       if (jmpval == sim_engine_start_jmpval)
  79         sig_to_deliver = siggnal;
  80       else
  81         sig_to_deliver = 0;
  82
  83 #ifdef SIM_CPU_EXCEPTION_RESUME
  84       {
  85         sim_cpu* cpu = STATE_CPU (sd, next_cpu_nr);
  86         SIM_CPU_EXCEPTION_RESUME(sd, cpu, sig_to_deliver);
  87       }
  88 #endif
  89
  90       sim_engine_run (sd, next_cpu_nr, nr_cpus, sig_to_deliver);
  91     }
  92   engine->jmpbuf = NULL;
  93
  94   sim_module_suspend (sd);
  95 }