sim/common/sim-engine.c

   1 /* Generic simulator halt/restart.
   2    Copyright (C) 1997, 1998 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 <stdio.h>
  22
  23 #include "sim-main.h"
  24 #include "sim-assert.h"
  25
  26 /* Get the run state.
  27    REASON/SIGRC are the values returned by sim_stop_reason.
  28    ??? Should each cpu have its own copy?  */
  29
  30 void
  31 sim_engine_get_run_state (SIM_DESC sd, enum sim_stop *reason, int *sigrc)
  32 {
  33   sim_engine *engine = STATE_ENGINE (sd);
  34   ASSERT (STATE_MAGIC (sd) == SIM_MAGIC_NUMBER);
  35   *reason = engine->reason;
  36   *sigrc = engine->sigrc;
  37 }
  38
  39 /* Set the run state to REASON/SIGRC.
  40    REASON/SIGRC are the values returned by sim_stop_reason.
  41    ??? Should each cpu have its own copy?  */
  42
  43 void
  44 sim_engine_set_run_state (SIM_DESC sd, enum sim_stop reason, int sigrc)
  45 {
  46   sim_engine *engine = STATE_ENGINE (sd);
  47   ASSERT (STATE_MAGIC (sd) == SIM_MAGIC_NUMBER);
  48   engine->reason = reason;
  49   engine->sigrc = sigrc;
  50 }
  51
  52 /* Generic halt */
  53
  54 void
  55 sim_engine_halt (SIM_DESC sd,
  56                  sim_cpu *last_cpu,
  57                  sim_cpu *next_cpu, /* NULL - use default */
  58                  sim_cia cia,
  59                  enum sim_stop reason,
  60                  int sigrc)
  61 {
  62   sim_engine *engine = STATE_ENGINE (sd);
  63   ASSERT (STATE_MAGIC (sd) == SIM_MAGIC_NUMBER);
  64   if (engine->jmpbuf != NULL)
  65     {
  66       jmp_buf *halt_buf = engine->jmpbuf;
  67       engine->last_cpu = last_cpu;
  68       engine->next_cpu = next_cpu;
  69       engine->reason = reason;
  70       engine->sigrc = sigrc;
  71
  72       SIM_ENGINE_HALT_HOOK (sd, last_cpu, cia);
  73
  74 #ifdef SIM_CPU_EXCEPTION_SUSPEND
  75       if (last_cpu != NULL && reason != sim_exited)
  76         SIM_CPU_EXCEPTION_SUSPEND (sd, last_cpu, sim_signal_to_host (sd, sigrc));
  77 #endif
  78
  79       longjmp (*halt_buf, sim_engine_halt_jmpval);
  80     }
  81   else
  82     sim_io_error (sd, "sim_halt - bad long jump");
  83 }
  84
  85
  86 /* Generic restart */
  87
  88 void
  89 sim_engine_restart (SIM_DESC sd,
  90                     sim_cpu *last_cpu,
  91                     sim_cpu *next_cpu,
  92                     sim_cia cia)
  93 {
  94   sim_engine *engine = STATE_ENGINE (sd);
  95   ASSERT (STATE_MAGIC (sd) == SIM_MAGIC_NUMBER);
  96   if (engine->jmpbuf != NULL)
  97     {
  98       jmp_buf *halt_buf = engine->jmpbuf;
  99       engine->last_cpu = last_cpu;
 100       engine->next_cpu = next_cpu;
 101       SIM_ENGINE_RESTART_HOOK (sd, last_cpu, cia);
 102       longjmp (*halt_buf, sim_engine_restart_jmpval);
 103     }
 104   else
 105     sim_io_error (sd, "sim_restart - bad long jump");
 106 }
 107
 108
 109 /* Generic error code */
 110
 111 void
 112 sim_engine_vabort (SIM_DESC sd,
 113                    sim_cpu *cpu,
 114                    sim_cia cia,
 115                    const char *fmt,
 116                    va_list ap)
 117 {
 118   ASSERT (sd == NULL || STATE_MAGIC (sd) == SIM_MAGIC_NUMBER);
 119   if (sd == NULL)
 120     {
 121       vfprintf (stderr, fmt, ap);
 122       fprintf (stderr, "\nQuit\n");
 123       abort ();
 124     }
 125   else if (STATE_ENGINE (sd)->jmpbuf == NULL)
 126     {
 127       sim_io_evprintf (sd, fmt, ap);
 128       sim_io_eprintf (sd, "\n");
 129       sim_io_error (sd, "Quit Simulator");
 130     }
 131   else
 132     {
 133       sim_io_evprintf (sd, fmt, ap);
 134       sim_io_eprintf (sd, "\n");
 135       sim_engine_halt (sd, cpu, NULL, cia, sim_stopped, SIM_SIGABRT);
 136     }
 137 }
 138
 139 void
 140 sim_engine_abort (SIM_DESC sd,
 141                   sim_cpu *cpu,
 142                   sim_cia cia,
 143                   const char *fmt,
 144                   ...)
 145 {
 146   va_list ap;
 147   ASSERT (sd == NULL || STATE_MAGIC (sd) == SIM_MAGIC_NUMBER);
 148   va_start(ap, fmt);
 149   sim_engine_vabort (sd, cpu, cia, fmt, ap);
 150   va_end (ap);
 151 }
 152
 153
 154 /* Generic next/last cpu */
 155
 156 int
 157 sim_engine_last_cpu_nr (SIM_DESC sd)
 158 {
 159   sim_engine *engine = STATE_ENGINE (sd);
 160   if (engine->last_cpu != NULL)
 161     return engine->last_cpu - STATE_CPU (sd, 0);
 162   else
 163     return MAX_NR_PROCESSORS;
 164 }
 165
 166 int
 167 sim_engine_next_cpu_nr (SIM_DESC sd)
 168 {
 169   sim_engine *engine = STATE_ENGINE (sd);
 170   if (engine->next_cpu != NULL)
 171     return engine->next_cpu - STATE_CPU (sd, 0);
 172   else
 173     return sim_engine_last_cpu_nr (sd) + 1;
 174 }
 175
 176 int
 177 sim_engine_nr_cpus (SIM_DESC sd)
 178 {
 179   sim_engine *engine = STATE_ENGINE (sd);
 180   return engine->nr_cpus;
 181 }
 182
 183
 184
 185
 186 /* Initialization */
 187
 188 static SIM_RC
 189 sim_engine_init (SIM_DESC sd)
 190 {
 191   /* initialize the start/stop/resume engine */
 192   sim_engine *engine = STATE_ENGINE (sd);
 193   engine->jmpbuf = NULL;
 194   engine->last_cpu = NULL;
 195   engine->next_cpu = NULL;
 196   engine->nr_cpus = MAX_NR_PROCESSORS;
 197   engine->reason = sim_running;
 198   engine->sigrc = 0;
 199   engine->stepper = NULL; /* sim_events_init will clean it up */
 200   return SIM_RC_OK;
 201 }
 202
 203
 204 SIM_RC
 205 sim_engine_install (SIM_DESC sd)
 206 {
 207   SIM_ASSERT (STATE_MAGIC (sd) == SIM_MAGIC_NUMBER);
 208   sim_module_add_init_fn (sd, sim_engine_init);
 209   return SIM_RC_OK;
 210 }