sim/common/nrun.c

   1 /* New version of run front end support for simulators.
   2    Copyright (C) 1997-2019 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 "config.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 const 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   const 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 = lbasename (argv[0]);
  76
  77   /* INTERNAL: When MYNAME is `step', single step the simulator
  78      instead of allowing it to run free.  The sole purpose of this
  79      HACK is to allow the sim_resume interface's step argument to be
  80      tested without having to build/run gdb. */
  81   if (strlen (myname) > 4 && strcmp (myname - 4, "step") == 0)
  82     {
  83       single_step = 1;
  84     }
  85
  86   /* Create an instance of the simulator.  */
  87   default_callback.init (&default_callback);
  88   sd = sim_open (SIM_OPEN_STANDALONE, &default_callback, NULL, argv);
  89   if (sd == 0)
  90     exit (1);
  91   if (STATE_MAGIC (sd) != SIM_MAGIC_NUMBER)
  92     {
  93       fprintf (stderr, "Internal error - bad magic number in simulator struct\n");
  94       abort ();
  95     }
  96
  97   /* We can't set the endianness in the callback structure until
  98      sim_config is called, which happens in sim_open.  */
  99   default_callback.target_endian
 100     = (CURRENT_TARGET_BYTE_ORDER == BFD_ENDIAN_BIG
 101        ? BFD_ENDIAN_BIG : BFD_ENDIAN_LITTLE);
 102
 103   /* Was there a program to run?  */
 104   prog_argv = STATE_PROG_ARGV (sd);
 105   prog_bfd = STATE_PROG_BFD (sd);
 106   if (prog_argv == NULL || *prog_argv == NULL)
 107     usage ();
 108
 109   name = *prog_argv;
 110
 111   /* For simulators that don't open prog during sim_open() */
 112   if (prog_bfd == NULL)
 113     {
 114       prog_bfd = bfd_openr (name, 0);
 115       if (prog_bfd == NULL)
 116         {
 117           fprintf (stderr, "%s: can't open \"%s\": %s\n",
 118                    myname, name, bfd_errmsg (bfd_get_error ()));
 119           exit (1);
 120         }
 121       if (!bfd_check_format (prog_bfd, bfd_object))
 122         {
 123           fprintf (stderr, "%s: \"%s\" is not an object file: %s\n",
 124                    myname, name, bfd_errmsg (bfd_get_error ()));
 125           exit (1);
 126         }
 127     }
 128
 129   if (STATE_VERBOSE_P (sd))
 130     printf ("%s %s\n", myname, name);
 131
 132   /* Load the program into the simulator.  */
 133   if (sim_load (sd, name, prog_bfd, 0) == SIM_RC_FAIL)
 134     exit (1);
 135
 136   /* Prepare the program for execution.  */
 137 #ifdef HAVE_ENVIRON
 138   sim_create_inferior (sd, prog_bfd, prog_argv, environ);
 139 #else
 140   sim_create_inferior (sd, prog_bfd, prog_argv, NULL);
 141 #endif
 142
 143   /* To accommodate relative file paths, chdir to sysroot now.  We
 144      mustn't do this until BFD has opened the program, else we wouldn't
 145      find the executable if it has a relative file path.  */
 146   if (simulator_sysroot[0] != '\0' && chdir (simulator_sysroot) < 0)
 147     {
 148       fprintf (stderr, "%s: can't change directory to \"%s\"\n",
 149                myname, simulator_sysroot);
 150       exit (1);
 151     }
 152
 153   /* Run/Step the program.  */
 154   if (single_step)
 155     {
 156       do
 157         {
 158           prev_sigint = signal (SIGINT, cntrl_c);
 159           sim_resume (sd, 1/*step*/, 0);
 160           signal (SIGINT, prev_sigint);
 161           sim_stop_reason (sd, &reason, &sigrc);
 162
 163           if ((reason == sim_stopped) &&
 164               (sigrc == sim_signal_to_host (sd, SIM_SIGINT)))
 165             break; /* exit on control-C */
 166         }
 167       /* remain on breakpoint or signals in oe mode*/
 168       while (((reason == sim_signalled) &&
 169               (sigrc == sim_signal_to_host (sd, SIM_SIGTRAP))) ||
 170              ((reason == sim_stopped) &&
 171               (STATE_ENVIRONMENT (sd) == OPERATING_ENVIRONMENT)));
 172     }
 173   else
 174     {
 175       do
 176         {
 177 #if defined (HAVE_SIGACTION) && defined (SA_RESTART)
 178           struct sigaction sa, osa;
 179           sa.sa_handler = cntrl_c;
 180           sigemptyset (&sa.sa_mask);
 181           sa.sa_flags = 0;
 182           sigaction (SIGINT, &sa, &osa);
 183           prev_sigint = osa.sa_handler;
 184 #else
 185           prev_sigint = signal (SIGINT, cntrl_c);
 186 #endif
 187           sim_resume (sd, 0, sigrc);
 188           signal (SIGINT, prev_sigint);
 189           sim_stop_reason (sd, &reason, &sigrc);
 190
 191           if ((reason == sim_stopped) &&
 192               (sigrc == sim_signal_to_host (sd, SIM_SIGINT)))
 193             break; /* exit on control-C */
 194
 195           /* remain on signals in oe mode */
 196         } while ((reason == sim_stopped) &&
 197                  (STATE_ENVIRONMENT (sd) == OPERATING_ENVIRONMENT));
 198
 199     }
 200   /* Print any stats the simulator collected.  */
 201   if (STATE_VERBOSE_P (sd))
 202     sim_info (sd, 0);
 203
 204   /* Shutdown the simulator.  */
 205   sim_close (sd, 0);
 206
 207   /* If reason is sim_exited, then sigrc holds the exit code which we want
 208      to return.  If reason is sim_stopped or sim_signalled, then sigrc holds
 209      the signal that the simulator received; we want to return that to
 210      indicate failure.  */
 211
 212   /* Why did we stop? */
 213   switch (reason)
 214     {
 215     case sim_signalled:
 216     case sim_stopped:
 217       if (sigrc != 0)
 218         fprintf (stderr, "program stopped with signal %d (%s).\n", sigrc,
 219                  strsignal (sigrc));
 220       break;
 221
 222     case sim_exited:
 223       break;
 224
 225     default:
 226       fprintf (stderr, "program in undefined state (%d:%d)\n", reason, sigrc);
 227       break;
 228
 229     }
 230
 231   return sigrc;
 232 }
 233
 234 static void
 235 usage (void)
 236 {
 237   fprintf (stderr, "Usage: %s [options] program [program args]\n", myname);
 238   fprintf (stderr, "Run `%s --help' for full list of options.\n", myname);
 239   exit (1);
 240 }