sim/common/nrun.c

   1 /* New version of run front end support for simulators.
   2    Copyright (C) 1997-2016 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 #endif
  21
  22 #include <signal.h>
  23
  24 /* For strsignal.  */
  25 #ifdef HAVE_STRING_H
  26 #include <string.h>
  27 #else
  28 #ifdef HAVE_STRINGS_H
  29 #include <strings.h>
  30 #endif
  31 #endif
  32
  33 #include "sim-main.h"
  34
  35 #include "bfd.h"
  36
  37 #ifdef HAVE_ENVIRON
  38 extern char **environ;
  39 #endif
  40
  41 #ifdef HAVE_UNISTD_H
  42 /* For chdir.  */
  43 #include <unistd.h>
  44 #endif
  45
  46 static void usage (void);
  47
  48 extern host_callback default_callback;
  49
  50 static char *myname;
  51
  52 static SIM_DESC sd;
  53
  54 static RETSIGTYPE
  55 cntrl_c (int sig)
  56 {
  57   if (! sim_stop (sd))
  58     {
  59       fprintf (stderr, "Quit!\n");
  60       exit (1);
  61     }
  62 }
  63
  64 int
  65 main (int argc, char **argv)
  66 {
  67   char *name;
  68   char **prog_argv = NULL;
  69   struct bfd *prog_bfd;
  70   enum sim_stop reason;
  71   int sigrc = 0;
  72   int single_step = 0;
  73   RETSIGTYPE (*prev_sigint) ();
  74
  75   myname = argv[0] + strlen (argv[0]);
  76   while (myname > argv[0] && myname[-1] != '/')
  77     --myname;
  78
  79   /* INTERNAL: When MYNAME is `step', single step the simulator
  80      instead of allowing it to run free.  The sole purpose of this
  81      HACK is to allow the sim_resume interface's step argument to be
  82      tested without having to build/run gdb. */
  83   if (strlen (myname) > 4 && strcmp (myname - 4, "step") == 0)
  84     {
  85       single_step = 1;
  86     }
  87
  88   /* Create an instance of the simulator.  */
  89   default_callback.init (&default_callback);
  90   sd = sim_open (SIM_OPEN_STANDALONE, &default_callback, NULL, argv);
  91   if (sd == 0)
  92     exit (1);
  93   if (STATE_MAGIC (sd) != SIM_MAGIC_NUMBER)
  94     {
  95       fprintf (stderr, "Internal error - bad magic number in simulator struct\n");
  96       abort ();
  97     }
  98
  99   /* We can't set the endianness in the callback structure until
 100      sim_config is called, which happens in sim_open.  */
 101   default_callback.target_endian
 102     = (CURRENT_TARGET_BYTE_ORDER == BIG_ENDIAN
 103        ? BFD_ENDIAN_BIG : BFD_ENDIAN_LITTLE);
 104
 105   /* Was there a program to run?  */
 106   prog_argv = STATE_PROG_ARGV (sd);
 107   prog_bfd = STATE_PROG_BFD (sd);
 108   if (prog_argv == NULL || *prog_argv == NULL)
 109     usage ();
 110
 111   name = *prog_argv;
 112
 113   /* For simulators that don't open prog during sim_open() */
 114   if (prog_bfd == NULL)
 115     {
 116       prog_bfd = bfd_openr (name, 0);
 117       if (prog_bfd == NULL)
 118         {
 119           fprintf (stderr, "%s: can't open \"%s\": %s\n",
 120                    myname, name, bfd_errmsg (bfd_get_error ()));
 121           exit (1);
 122         }
 123       if (!bfd_check_format (prog_bfd, bfd_object))
 124         {
 125           fprintf (stderr, "%s: \"%s\" is not an object file: %s\n",
 126                    myname, name, bfd_errmsg (bfd_get_error ()));
 127           exit (1);
 128         }
 129     }
 130
 131   if (STATE_VERBOSE_P (sd))
 132     printf ("%s %s\n", myname, name);
 133
 134   /* Load the program into the simulator.  */
 135   if (sim_load (sd, name, prog_bfd, 0) == SIM_RC_FAIL)
 136     exit (1);
 137
 138   /* Prepare the program for execution.  */
 139 #ifdef HAVE_ENVIRON
 140   sim_create_inferior (sd, prog_bfd, prog_argv, environ);
 141 #else
 142   sim_create_inferior (sd, prog_bfd, prog_argv, NULL);
 143 #endif
 144
 145   /* To accommodate relative file paths, chdir to sysroot now.  We
 146      mustn't do this until BFD has opened the program, else we wouldn't
 147      find the executable if it has a relative file path.  */
 148   if (simulator_sysroot[0] != '\0' && chdir (simulator_sysroot) < 0)
 149     {
 150       fprintf (stderr, "%s: can't change directory to \"%s\"\n",
 151                myname, simulator_sysroot);
 152       exit (1);
 153     }
 154
 155   /* Run/Step the program.  */
 156   if (single_step)
 157     {
 158       do
 159         {
 160           prev_sigint = signal (SIGINT, cntrl_c);
 161           sim_resume (sd, 1/*step*/, 0);
 162           signal (SIGINT, prev_sigint);
 163           sim_stop_reason (sd, &reason, &sigrc);
 164
 165           if ((reason == sim_stopped) &&
 166               (sigrc == sim_signal_to_host (sd, SIM_SIGINT)))
 167             break; /* exit on control-C */
 168         }
 169       /* remain on breakpoint or signals in oe mode*/
 170       while (((reason == sim_signalled) &&
 171               (sigrc == sim_signal_to_host (sd, SIM_SIGTRAP))) ||
 172              ((reason == sim_stopped) &&
 173               (STATE_ENVIRONMENT (sd) == OPERATING_ENVIRONMENT)));
 174     }
 175   else
 176     {
 177       do
 178         {
 179 #if defined (HAVE_SIGACTION) && defined (SA_RESTART)
 180           struct sigaction sa, osa;
 181           sa.sa_handler = cntrl_c;
 182           sigemptyset (&sa.sa_mask);
 183           sa.sa_flags = 0;
 184           sigaction (SIGINT, &sa, &osa);
 185           prev_sigint = osa.sa_handler;
 186 #else
 187           prev_sigint = signal (SIGINT, cntrl_c);
 188 #endif
 189           sim_resume (sd, 0, sigrc);
 190           signal (SIGINT, prev_sigint);
 191           sim_stop_reason (sd, &reason, &sigrc);
 192
 193           if ((reason == sim_stopped) &&
 194               (sigrc == sim_signal_to_host (sd, SIM_SIGINT)))
 195             break; /* exit on control-C */
 196
 197           /* remain on signals in oe mode */
 198         } while ((reason == sim_stopped) &&
 199                  (STATE_ENVIRONMENT (sd) == OPERATING_ENVIRONMENT));
 200
 201     }
 202   /* Print any stats the simulator collected.  */
 203   if (STATE_VERBOSE_P (sd))
 204     sim_info (sd, 0);
 205
 206   /* Shutdown the simulator.  */
 207   sim_close (sd, 0);
 208
 209   /* If reason is sim_exited, then sigrc holds the exit code which we want
 210      to return.  If reason is sim_stopped or sim_signalled, then sigrc holds
 211      the signal that the simulator received; we want to return that to
 212      indicate failure.  */
 213
 214   /* Why did we stop? */
 215   switch (reason)
 216     {
 217     case sim_signalled:
 218     case sim_stopped:
 219       if (sigrc != 0)
 220         fprintf (stderr, "program stopped with signal %d (%s).\n", sigrc,
 221                  strsignal (sigrc));
 222       break;
 223
 224     case sim_exited:
 225       break;
 226
 227     default:
 228       fprintf (stderr, "program in undefined state (%d:%d)\n", reason, sigrc);
 229       break;
 230
 231     }
 232
 233   return sigrc;
 234 }
 235
 236 static void
 237 usage (void)
 238 {
 239   fprintf (stderr, "Usage: %s [options] program [program args]\n", myname);
 240   fprintf (stderr, "Run `%s --help' for full list of options.\n", myname);
 241   exit (1);
 242 }