sim/common/nrun.c

   1 /* New version of run front end support for simulators.
   2    Copyright (C) 1997, 2004, 2007, 2008 Free Software Foundation, Inc.
   3
   4 This program is free software; you can redistribute it and/or modify
   5 it under the terms of the GNU General Public License as published by
   6 the Free Software Foundation; either version 3 of the License, or
   7 (at your option) any later version.
   8
   9 This program is distributed in the hope that it will be useful,
  10 but WITHOUT ANY WARRANTY; without even the implied warranty of
  11 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12 GNU General Public License for more details.
  13
  14 You should have received a copy of the GNU General Public License
  15 along with this program.  If not, see <http://www.gnu.org/licenses/>.  */
  16
  17 #include <signal.h>
  18 #include "sim-main.h"
  19
  20 #include "bfd.h"
  21
  22 #ifdef HAVE_ENVIRON
  23 extern char **environ;
  24 #endif
  25
  26 #ifdef HAVE_UNISTD_H
  27 /* For chdir.  */
  28 #include <unistd.h>
  29 #endif
  30
  31 static void usage (void);
  32
  33 extern host_callback default_callback;
  34
  35 static char *myname;
  36
  37 static SIM_DESC sd;
  38
  39 static RETSIGTYPE
  40 cntrl_c (int sig)
  41 {
  42   if (! sim_stop (sd))
  43     {
  44       fprintf (stderr, "Quit!\n");
  45       exit (1);
  46     }
  47 }
  48
  49 int
  50 main (int argc, char **argv)
  51 {
  52   char *name;
  53   char **prog_argv = NULL;
  54   struct bfd *prog_bfd;
  55   enum sim_stop reason;
  56   int sigrc = 0;
  57   int single_step = 0;
  58   RETSIGTYPE (*prev_sigint) ();
  59
  60   myname = argv[0] + strlen (argv[0]);
  61   while (myname > argv[0] && myname[-1] != '/')
  62     --myname;
  63
  64   /* INTERNAL: When MYNAME is `step', single step the simulator
  65      instead of allowing it to run free.  The sole purpose of this
  66      HACK is to allow the sim_resume interface's step argument to be
  67      tested without having to build/run gdb. */
  68   if (strlen (myname) > 4 && strcmp (myname - 4, "step") == 0)
  69     {
  70       single_step = 1;
  71     }
  72
  73   /* Create an instance of the simulator.  */
  74   default_callback.init (&default_callback);
  75   sd = sim_open (SIM_OPEN_STANDALONE, &default_callback, NULL, argv);
  76   if (sd == 0)
  77     exit (1);
  78   if (STATE_MAGIC (sd) != SIM_MAGIC_NUMBER)
  79     {
  80       fprintf (stderr, "Internal error - bad magic number in simulator struct\n");
  81       abort ();
  82     }
  83
  84   /* We can't set the endianness in the callback structure until
  85      sim_config is called, which happens in sim_open.  */
  86   default_callback.target_endian
  87     = (CURRENT_TARGET_BYTE_ORDER == BIG_ENDIAN
  88        ? BFD_ENDIAN_BIG : BFD_ENDIAN_LITTLE);
  89
  90   /* Was there a program to run?  */
  91   prog_argv = STATE_PROG_ARGV (sd);
  92   prog_bfd = STATE_PROG_BFD (sd);
  93   if (prog_argv == NULL || *prog_argv == NULL)
  94     usage ();
  95
  96   name = *prog_argv;
  97
  98   /* For simulators that don't open prog during sim_open() */
  99   if (prog_bfd == NULL)
 100     {
 101       prog_bfd = bfd_openr (name, 0);
 102       if (prog_bfd == NULL)
 103         {
 104           fprintf (stderr, "%s: can't open \"%s\": %s\n",
 105                    myname, name, bfd_errmsg (bfd_get_error ()));
 106           exit (1);
 107         }
 108       if (!bfd_check_format (prog_bfd, bfd_object))
 109         {
 110           fprintf (stderr, "%s: \"%s\" is not an object file: %s\n",
 111                    myname, name, bfd_errmsg (bfd_get_error ()));
 112           exit (1);
 113         }
 114     }
 115
 116   if (STATE_VERBOSE_P (sd))
 117     printf ("%s %s\n", myname, name);
 118
 119   /* Load the program into the simulator.  */
 120   if (sim_load (sd, name, prog_bfd, 0) == SIM_RC_FAIL)
 121     exit (1);
 122
 123   /* Prepare the program for execution.  */
 124 #ifdef HAVE_ENVIRON
 125   sim_create_inferior (sd, prog_bfd, prog_argv, environ);
 126 #else
 127   sim_create_inferior (sd, prog_bfd, prog_argv, NULL);
 128 #endif
 129
 130   /* To accommodate relative file paths, chdir to sysroot now.  We
 131      mustn't do this until BFD has opened the program, else we wouldn't
 132      find the executable if it has a relative file path.  */
 133   if (simulator_sysroot[0] != '\0' && chdir (simulator_sysroot) < 0)
 134     {
 135       fprintf (stderr, "%s: can't change directory to \"%s\"\n",
 136                myname, simulator_sysroot);
 137       exit (1);
 138     }
 139
 140   /* Run/Step the program.  */
 141   if (single_step)
 142     {
 143       do
 144         {
 145           prev_sigint = signal (SIGINT, cntrl_c);
 146           sim_resume (sd, 1/*step*/, 0);
 147           signal (SIGINT, prev_sigint);
 148           sim_stop_reason (sd, &reason, &sigrc);
 149
 150           if ((reason == sim_stopped) &&
 151               (sigrc == sim_signal_to_host (sd, SIM_SIGINT)))
 152             break; /* exit on control-C */
 153         }
 154       /* remain on breakpoint or signals in oe mode*/
 155       while (((reason == sim_signalled) &&
 156               (sigrc == sim_signal_to_host (sd, SIM_SIGTRAP))) ||
 157              ((reason == sim_stopped) &&
 158               (STATE_ENVIRONMENT (sd) == OPERATING_ENVIRONMENT)));
 159     }
 160   else
 161     {
 162       do
 163         {
 164 #if defined (HAVE_SIGACTION) && defined (SA_RESTART)
 165           struct sigaction sa, osa;
 166           sa.sa_handler = cntrl_c;
 167           sigemptyset (&sa.sa_mask);
 168           sa.sa_flags = 0;
 169           sigaction (SIGINT, &sa, &osa);
 170           prev_sigint = osa.sa_handler;
 171 #else
 172           prev_sigint = signal (SIGINT, cntrl_c);
 173 #endif
 174           sim_resume (sd, 0, sigrc);
 175           signal (SIGINT, prev_sigint);
 176           sim_stop_reason (sd, &reason, &sigrc);
 177
 178           if ((reason == sim_stopped) &&
 179               (sigrc == sim_signal_to_host (sd, SIM_SIGINT)))
 180             break; /* exit on control-C */
 181
 182           /* remain on signals in oe mode */
 183         } while ((reason == sim_stopped) &&
 184                  (STATE_ENVIRONMENT (sd) == OPERATING_ENVIRONMENT));
 185
 186     }
 187   /* Print any stats the simulator collected.  */
 188   if (STATE_VERBOSE_P (sd))
 189     sim_info (sd, 0);
 190
 191   /* Shutdown the simulator.  */
 192   sim_close (sd, 0);
 193
 194   /* If reason is sim_exited, then sigrc holds the exit code which we want
 195      to return.  If reason is sim_stopped or sim_signalled, then sigrc holds
 196      the signal that the simulator received; we want to return that to
 197      indicate failure.  */
 198
 199   /* Why did we stop? */
 200   switch (reason)
 201     {
 202     case sim_signalled:
 203     case sim_stopped:
 204       if (sigrc != 0)
 205         fprintf (stderr, "program stopped with signal %d.\n", sigrc);
 206       break;
 207
 208     case sim_exited:
 209       break;
 210
 211     default:
 212       fprintf (stderr, "program in undefined state (%d:%d)\n", reason, sigrc);
 213       break;
 214
 215     }
 216
 217   return sigrc;
 218 }
 219
 220 static void
 221 usage ()
 222 {
 223   fprintf (stderr, "Usage: %s [options] program [program args]\n", myname);
 224   fprintf (stderr, "Run `%s --help' for full list of options.\n", myname);
 225   exit (1);
 226 }