sim/common/nrun.c

   1 /* New version of run front end support for simulators.
   2    Copyright (C) 1997-2013 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 /* Need to be before general includes, to pick up e.g. _GNU_SOURCE.  */
  18 #ifdef HAVE_CONFIG_H
  19 #include "cconfig.h"
  20 #include "tconfig.h"
  21 #endif
  22
  23 #include <signal.h>
  24
  25 /* For strsignal.  */
  26 #ifdef HAVE_STRING_H
  27 #include <string.h>
  28 #else
  29 #ifdef HAVE_STRINGS_H
  30 #include <strings.h>
  31 #endif
  32 #endif
  33
  34 #include "sim-main.h"
  35
  36 #include "bfd.h"
  37
  38 #ifdef HAVE_ENVIRON
  39 extern char **environ;
  40 #endif
  41
  42 #ifdef HAVE_UNISTD_H
  43 /* For chdir.  */
  44 #include <unistd.h>
  45 #endif
  46
  47 static void usage (void);
  48
  49 extern host_callback default_callback;
  50
  51 static char *myname;
  52
  53 static SIM_DESC sd;
  54
  55 static RETSIGTYPE
  56 cntrl_c (int sig)
  57 {
  58   if (! sim_stop (sd))
  59     {
  60       fprintf (stderr, "Quit!\n");
  61       exit (1);
  62     }
  63 }
  64
  65 int
  66 main (int argc, char **argv)
  67 {
  68   char *name;
  69   char **prog_argv = NULL;
  70   struct bfd *prog_bfd;
  71   enum sim_stop reason;
  72   int sigrc = 0;
  73   int single_step = 0;
  74   RETSIGTYPE (*prev_sigint) ();
  75
  76   myname = argv[0] + strlen (argv[0]);
  77   while (myname > argv[0] && myname[-1] != '/')
  78     --myname;
  79
  80   /* INTERNAL: When MYNAME is `step', single step the simulator
  81      instead of allowing it to run free.  The sole purpose of this
  82      HACK is to allow the sim_resume interface's step argument to be
  83      tested without having to build/run gdb. */
  84   if (strlen (myname) > 4 && strcmp (myname - 4, "step") == 0)
  85     {
  86       single_step = 1;
  87     }
  88
  89   /* Create an instance of the simulator.  */
  90   default_callback.init (&default_callback);
  91   sd = sim_open (SIM_OPEN_STANDALONE, &default_callback, NULL, argv);
  92   if (sd == 0)
  93     exit (1);
  94   if (STATE_MAGIC (sd) != SIM_MAGIC_NUMBER)
  95     {
  96       fprintf (stderr, "Internal error - bad magic number in simulator struct\n");
  97       abort ();
  98     }
  99
 100   /* We can't set the endianness in the callback structure until
 101      sim_config is called, which happens in sim_open.  */
 102   default_callback.target_endian
 103     = (CURRENT_TARGET_BYTE_ORDER == BIG_ENDIAN
 104        ? BFD_ENDIAN_BIG : BFD_ENDIAN_LITTLE);
 105
 106   /* Was there a program to run?  */
 107   prog_argv = STATE_PROG_ARGV (sd);
 108   prog_bfd = STATE_PROG_BFD (sd);
 109   if (prog_argv == NULL || *prog_argv == NULL)
 110     usage ();
 111
 112   name = *prog_argv;
 113
 114   /* For simulators that don't open prog during sim_open() */
 115   if (prog_bfd == NULL)
 116     {
 117       prog_bfd = bfd_openr (name, 0);
 118       if (prog_bfd == NULL)
 119         {
 120           fprintf (stderr, "%s: can't open \"%s\": %s\n",
 121                    myname, name, bfd_errmsg (bfd_get_error ()));
 122           exit (1);
 123         }
 124       if (!bfd_check_format (prog_bfd, bfd_object))
 125         {
 126           fprintf (stderr, "%s: \"%s\" is not an object file: %s\n",
 127                    myname, name, bfd_errmsg (bfd_get_error ()));
 128           exit (1);
 129         }
 130     }
 131
 132   if (STATE_VERBOSE_P (sd))
 133     printf ("%s %s\n", myname, name);
 134
 135   /* Load the program into the simulator.  */
 136   if (sim_load (sd, name, prog_bfd, 0) == SIM_RC_FAIL)
 137     exit (1);
 138
 139   /* Prepare the program for execution.  */
 140 #ifdef HAVE_ENVIRON
 141   sim_create_inferior (sd, prog_bfd, prog_argv, environ);
 142 #else
 143   sim_create_inferior (sd, prog_bfd, prog_argv, NULL);
 144 #endif
 145
 146   /* To accommodate relative file paths, chdir to sysroot now.  We
 147      mustn't do this until BFD has opened the program, else we wouldn't
 148      find the executable if it has a relative file path.  */
 149   if (simulator_sysroot[0] != '\0' && chdir (simulator_sysroot) < 0)
 150     {
 151       fprintf (stderr, "%s: can't change directory to \"%s\"\n",
 152                myname, simulator_sysroot);
 153       exit (1);
 154     }
 155
 156   /* Run/Step the program.  */
 157   if (single_step)
 158     {
 159       do
 160         {
 161           prev_sigint = signal (SIGINT, cntrl_c);
 162           sim_resume (sd, 1/*step*/, 0);
 163           signal (SIGINT, prev_sigint);
 164           sim_stop_reason (sd, &reason, &sigrc);
 165
 166           if ((reason == sim_stopped) &&
 167               (sigrc == sim_signal_to_host (sd, SIM_SIGINT)))
 168             break; /* exit on control-C */
 169         }
 170       /* remain on breakpoint or signals in oe mode*/
 171       while (((reason == sim_signalled) &&
 172               (sigrc == sim_signal_to_host (sd, SIM_SIGTRAP))) ||
 173              ((reason == sim_stopped) &&
 174               (STATE_ENVIRONMENT (sd) == OPERATING_ENVIRONMENT)));
 175     }
 176   else
 177     {
 178       do
 179         {
 180 #if defined (HAVE_SIGACTION) && defined (SA_RESTART)
 181           struct sigaction sa, osa;
 182           sa.sa_handler = cntrl_c;
 183           sigemptyset (&sa.sa_mask);
 184           sa.sa_flags = 0;
 185           sigaction (SIGINT, &sa, &osa);
 186           prev_sigint = osa.sa_handler;
 187 #else
 188           prev_sigint = signal (SIGINT, cntrl_c);
 189 #endif
 190           sim_resume (sd, 0, sigrc);
 191           signal (SIGINT, prev_sigint);
 192           sim_stop_reason (sd, &reason, &sigrc);
 193
 194           if ((reason == sim_stopped) &&
 195               (sigrc == sim_signal_to_host (sd, SIM_SIGINT)))
 196             break; /* exit on control-C */
 197
 198           /* remain on signals in oe mode */
 199         } while ((reason == sim_stopped) &&
 200                  (STATE_ENVIRONMENT (sd) == OPERATING_ENVIRONMENT));
 201
 202     }
 203   /* Print any stats the simulator collected.  */
 204   if (STATE_VERBOSE_P (sd))
 205     sim_info (sd, 0);
 206
 207   /* Shutdown the simulator.  */
 208   sim_close (sd, 0);
 209
 210   /* If reason is sim_exited, then sigrc holds the exit code which we want
 211      to return.  If reason is sim_stopped or sim_signalled, then sigrc holds
 212      the signal that the simulator received; we want to return that to
 213      indicate failure.  */
 214
 215   /* Why did we stop? */
 216   switch (reason)
 217     {
 218     case sim_signalled:
 219     case sim_stopped:
 220       if (sigrc != 0)
 221         fprintf (stderr, "program stopped with signal %d (%s).\n", sigrc,
 222                  strsignal (sigrc));
 223       break;
 224
 225     case sim_exited:
 226       break;
 227
 228     default:
 229       fprintf (stderr, "program in undefined state (%d:%d)\n", reason, sigrc);
 230       break;
 231
 232     }
 233
 234   return sigrc;
 235 }
 236
 237 static void
 238 usage (void)
 239 {
 240   fprintf (stderr, "Usage: %s [options] program [program args]\n", myname);
 241   fprintf (stderr, "Run `%s --help' for full list of options.\n", myname);
 242   exit (1);
 243 }