sim/common/nrun.c

   1 /* New version of run front end support for simulators.
   2    Copyright (C) 1997, 2004, 2007-2012 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
  19 /* For strsignal.  */
  20 #ifdef HAVE_STRING_H
  21 #include <string.h>
  22 #else
  23 #ifdef HAVE_STRINGS_H
  24 #include <strings.h>
  25 #endif
  26 #endif
  27
  28 #include "sim-main.h"
  29
  30 #include "bfd.h"
  31
  32 #ifdef HAVE_ENVIRON
  33 extern char **environ;
  34 #endif
  35
  36 #ifdef HAVE_UNISTD_H
  37 /* For chdir.  */
  38 #include <unistd.h>
  39 #endif
  40
  41 static void usage (void);
  42
  43 extern host_callback default_callback;
  44
  45 static char *myname;
  46
  47 static SIM_DESC sd;
  48
  49 static RETSIGTYPE
  50 cntrl_c (int sig)
  51 {
  52   if (! sim_stop (sd))
  53     {
  54       fprintf (stderr, "Quit!\n");
  55       exit (1);
  56     }
  57 }
  58
  59 int
  60 main (int argc, char **argv)
  61 {
  62   char *name;
  63   char **prog_argv = NULL;
  64   struct bfd *prog_bfd;
  65   enum sim_stop reason;
  66   int sigrc = 0;
  67   int single_step = 0;
  68   RETSIGTYPE (*prev_sigint) ();
  69
  70   myname = argv[0] + strlen (argv[0]);
  71   while (myname > argv[0] && myname[-1] != '/')
  72     --myname;
  73
  74   /* INTERNAL: When MYNAME is `step', single step the simulator
  75      instead of allowing it to run free.  The sole purpose of this
  76      HACK is to allow the sim_resume interface's step argument to be
  77      tested without having to build/run gdb. */
  78   if (strlen (myname) > 4 && strcmp (myname - 4, "step") == 0)
  79     {
  80       single_step = 1;
  81     }
  82
  83   /* Create an instance of the simulator.  */
  84   default_callback.init (&default_callback);
  85   sd = sim_open (SIM_OPEN_STANDALONE, &default_callback, NULL, argv);
  86   if (sd == 0)
  87     exit (1);
  88   if (STATE_MAGIC (sd) != SIM_MAGIC_NUMBER)
  89     {
  90       fprintf (stderr, "Internal error - bad magic number in simulator struct\n");
  91       abort ();
  92     }
  93
  94   /* We can't set the endianness in the callback structure until
  95      sim_config is called, which happens in sim_open.  */
  96   default_callback.target_endian
  97     = (CURRENT_TARGET_BYTE_ORDER == BIG_ENDIAN
  98        ? BFD_ENDIAN_BIG : BFD_ENDIAN_LITTLE);
  99
 100   /* Was there a program to run?  */
 101   prog_argv = STATE_PROG_ARGV (sd);
 102   prog_bfd = STATE_PROG_BFD (sd);
 103   if (prog_argv == NULL || *prog_argv == NULL)
 104     usage ();
 105
 106   name = *prog_argv;
 107
 108   /* For simulators that don't open prog during sim_open() */
 109   if (prog_bfd == NULL)
 110     {
 111       prog_bfd = bfd_openr (name, 0);
 112       if (prog_bfd == NULL)
 113         {
 114           fprintf (stderr, "%s: can't open \"%s\": %s\n",
 115                    myname, name, bfd_errmsg (bfd_get_error ()));
 116           exit (1);
 117         }
 118       if (!bfd_check_format (prog_bfd, bfd_object))
 119         {
 120           fprintf (stderr, "%s: \"%s\" is not an object file: %s\n",
 121                    myname, name, bfd_errmsg (bfd_get_error ()));
 122           exit (1);
 123         }
 124     }
 125
 126   if (STATE_VERBOSE_P (sd))
 127     printf ("%s %s\n", myname, name);
 128
 129   /* Load the program into the simulator.  */
 130   if (sim_load (sd, name, prog_bfd, 0) == SIM_RC_FAIL)
 131     exit (1);
 132
 133   /* Prepare the program for execution.  */
 134 #ifdef HAVE_ENVIRON
 135   sim_create_inferior (sd, prog_bfd, prog_argv, environ);
 136 #else
 137   sim_create_inferior (sd, prog_bfd, prog_argv, NULL);
 138 #endif
 139
 140   /* To accommodate relative file paths, chdir to sysroot now.  We
 141      mustn't do this until BFD has opened the program, else we wouldn't
 142      find the executable if it has a relative file path.  */
 143   if (simulator_sysroot[0] != '\0' && chdir (simulator_sysroot) < 0)
 144     {
 145       fprintf (stderr, "%s: can't change directory to \"%s\"\n",
 146                myname, simulator_sysroot);
 147       exit (1);
 148     }
 149
 150   /* Run/Step the program.  */
 151   if (single_step)
 152     {
 153       do
 154         {
 155           prev_sigint = signal (SIGINT, cntrl_c);
 156           sim_resume (sd, 1/*step*/, 0);
 157           signal (SIGINT, prev_sigint);
 158           sim_stop_reason (sd, &reason, &sigrc);
 159
 160           if ((reason == sim_stopped) &&
 161               (sigrc == sim_signal_to_host (sd, SIM_SIGINT)))
 162             break; /* exit on control-C */
 163         }
 164       /* remain on breakpoint or signals in oe mode*/
 165       while (((reason == sim_signalled) &&
 166               (sigrc == sim_signal_to_host (sd, SIM_SIGTRAP))) ||
 167              ((reason == sim_stopped) &&
 168               (STATE_ENVIRONMENT (sd) == OPERATING_ENVIRONMENT)));
 169     }
 170   else
 171     {
 172       do
 173         {
 174 #if defined (HAVE_SIGACTION) && defined (SA_RESTART)
 175           struct sigaction sa, osa;
 176           sa.sa_handler = cntrl_c;
 177           sigemptyset (&sa.sa_mask);
 178           sa.sa_flags = 0;
 179           sigaction (SIGINT, &sa, &osa);
 180           prev_sigint = osa.sa_handler;
 181 #else
 182           prev_sigint = signal (SIGINT, cntrl_c);
 183 #endif
 184           sim_resume (sd, 0, sigrc);
 185           signal (SIGINT, prev_sigint);
 186           sim_stop_reason (sd, &reason, &sigrc);
 187
 188           if ((reason == sim_stopped) &&
 189               (sigrc == sim_signal_to_host (sd, SIM_SIGINT)))
 190             break; /* exit on control-C */
 191
 192           /* remain on signals in oe mode */
 193         } while ((reason == sim_stopped) &&
 194                  (STATE_ENVIRONMENT (sd) == OPERATING_ENVIRONMENT));
 195
 196     }
 197   /* Print any stats the simulator collected.  */
 198   if (STATE_VERBOSE_P (sd))
 199     sim_info (sd, 0);
 200
 201   /* Shutdown the simulator.  */
 202   sim_close (sd, 0);
 203
 204   /* If reason is sim_exited, then sigrc holds the exit code which we want
 205      to return.  If reason is sim_stopped or sim_signalled, then sigrc holds
 206      the signal that the simulator received; we want to return that to
 207      indicate failure.  */
 208
 209   /* Why did we stop? */
 210   switch (reason)
 211     {
 212     case sim_signalled:
 213     case sim_stopped:
 214       if (sigrc != 0)
 215         fprintf (stderr, "program stopped with signal %d (%s).\n", sigrc,
 216                  strsignal (sigrc));
 217       break;
 218
 219     case sim_exited:
 220       break;
 221
 222     default:
 223       fprintf (stderr, "program in undefined state (%d:%d)\n", reason, sigrc);
 224       break;
 225
 226     }
 227
 228   return sigrc;
 229 }
 230
 231 static void
 232 usage (void)
 233 {
 234   fprintf (stderr, "Usage: %s [options] program [program args]\n", myname);
 235   fprintf (stderr, "Run `%s --help' for full list of options.\n", myname);
 236   exit (1);
 237 }