gnu/dist/gdb6/sim/common/nrun.c

   1 /* New version of run front end support for simulators.
   2    Copyright (C) 1997, 2004 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 2, or (at your option)
   7 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 along
  15 with this program; if not, write to the Free Software Foundation, Inc.,
  16 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.  */
  17
  18 #include <signal.h>
  19 #include "sim-main.h"
  20
  21 #include "bfd.h"
  22
  23 #ifdef HAVE_ENVIRON
  24 extern char **environ;
  25 #endif
  26
  27 #ifdef HAVE_UNISTD_H
  28 /* For chdir.  */
  29 #include <unistd.h>
  30 #endif
  31
  32 static void usage (void);
  33
  34 extern host_callback default_callback;
  35
  36 static char *myname;
  37
  38 static SIM_DESC sd;
  39
  40 static RETSIGTYPE
  41 cntrl_c (int sig)
  42 {
  43   if (! sim_stop (sd))
  44     {
  45       fprintf (stderr, "Quit!\n");
  46       exit (1);
  47     }
  48 }
  49
  50 int
  51 main (int argc, char **argv)
  52 {
  53   char *name;
  54   char **prog_argv = NULL;
  55   struct bfd *prog_bfd;
  56   enum sim_stop reason;
  57   int sigrc = 0;
  58   int single_step = 0;
  59   RETSIGTYPE (*prev_sigint) ();
  60
  61   myname = argv[0] + strlen (argv[0]);
  62   while (myname > argv[0] && myname[-1] != '/')
  63     --myname;
  64
  65   /* INTERNAL: When MYNAME is `step', single step the simulator
  66      instead of allowing it to run free.  The sole purpose of this
  67      HACK is to allow the sim_resume interface's step argument to be
  68      tested without having to build/run gdb. */
  69   if (strlen (myname) > 4 && strcmp (myname - 4, "step") == 0)
  70     {
  71       single_step = 1;
  72     }
  73
  74   /* Create an instance of the simulator.  */
  75   default_callback.init (&default_callback);
  76   sd = sim_open (SIM_OPEN_STANDALONE, &default_callback, NULL, argv);
  77   if (sd == 0)
  78     exit (1);
  79   if (STATE_MAGIC (sd) != SIM_MAGIC_NUMBER)
  80     {
  81       fprintf (stderr, "Internal error - bad magic number in simulator struct\n");
  82       abort ();
  83     }
  84
  85   /* We can't set the endianness in the callback structure until
  86      sim_config is called, which happens in sim_open.  */
  87   default_callback.target_endian
  88     = (CURRENT_TARGET_BYTE_ORDER == BIG_ENDIAN
  89        ? BFD_ENDIAN_BIG : BFD_ENDIAN_LITTLE);
  90
  91   /* Was there a program to run?  */
  92   prog_argv = STATE_PROG_ARGV (sd);
  93   prog_bfd = STATE_PROG_BFD (sd);
  94   if (prog_argv == NULL || *prog_argv == NULL)
  95     usage ();
  96
  97   name = *prog_argv;
  98
  99   /* For simulators that don't open prog during sim_open() */
 100   if (prog_bfd == NULL)
 101     {
 102       prog_bfd = bfd_openr (name, 0);
 103       if (prog_bfd == NULL)
 104         {
 105           fprintf (stderr, "%s: can't open \"%s\": %s\n",
 106                    myname, name, bfd_errmsg (bfd_get_error ()));
 107           exit (1);
 108         }
 109       if (!bfd_check_format (prog_bfd, bfd_object))
 110         {
 111           fprintf (stderr, "%s: \"%s\" is not an object file: %s\n",
 112                    myname, name, bfd_errmsg (bfd_get_error ()));
 113           exit (1);
 114         }
 115     }
 116
 117   if (STATE_VERBOSE_P (sd))
 118     printf ("%s %s\n", myname, name);
 119
 120   /* Load the program into the simulator.  */
 121   if (sim_load (sd, name, prog_bfd, 0) == SIM_RC_FAIL)
 122     exit (1);
 123
 124   /* Prepare the program for execution.  */
 125 #ifdef HAVE_ENVIRON
 126   sim_create_inferior (sd, prog_bfd, prog_argv, environ);
 127 #else
 128   sim_create_inferior (sd, prog_bfd, prog_argv, NULL);
 129 #endif
 130
 131   /* To accommodate relative file paths, chdir to sysroot now.  We
 132      mustn't do this until BFD has opened the program, else we wouldn't
 133      find the executable if it has a relative file path.  */
 134   if (simulator_sysroot[0] != '\0' && chdir (simulator_sysroot) < 0)
 135     {
 136       fprintf (stderr, "%s: can't change directory to \"%s\"\n",
 137                myname, simulator_sysroot);
 138       exit (1);
 139     }
 140
 141   /* Run/Step the program.  */
 142   if (single_step)
 143     {
 144       do
 145         {
 146           prev_sigint = signal (SIGINT, cntrl_c);
 147           sim_resume (sd, 1/*step*/, 0);
 148           signal (SIGINT, prev_sigint);
 149           sim_stop_reason (sd, &reason, &sigrc);
 150
 151           if ((reason == sim_stopped) &&
 152               (sigrc == sim_signal_to_host (sd, SIM_SIGINT)))
 153             break; /* exit on control-C */
 154         }
 155       /* remain on breakpoint or signals in oe mode*/
 156       while (((reason == sim_signalled) &&
 157               (sigrc == sim_signal_to_host (sd, SIM_SIGTRAP))) ||
 158              ((reason == sim_stopped) &&
 159               (STATE_ENVIRONMENT (sd) == OPERATING_ENVIRONMENT)));
 160     }
 161   else
 162     {
 163       do
 164         {
 165 #if defined (HAVE_SIGACTION) && defined (SA_RESTART)
 166           struct sigaction sa, osa;
 167           sa.sa_handler = cntrl_c;
 168           sigemptyset (&sa.sa_mask);
 169           sa.sa_flags = 0;
 170           sigaction (SIGINT, &sa, &osa);
 171           prev_sigint = osa.sa_handler;
 172 #else
 173           prev_sigint = signal (SIGINT, cntrl_c);
 174 #endif
 175           sim_resume (sd, 0, sigrc);
 176           signal (SIGINT, prev_sigint);
 177           sim_stop_reason (sd, &reason, &sigrc);
 178
 179           if ((reason == sim_stopped) &&
 180               (sigrc == sim_signal_to_host (sd, SIM_SIGINT)))
 181             break; /* exit on control-C */
 182
 183           /* remain on signals in oe mode */
 184         } while ((reason == sim_stopped) &&
 185                  (STATE_ENVIRONMENT (sd) == OPERATING_ENVIRONMENT));
 186
 187     }
 188   /* Print any stats the simulator collected.  */
 189   if (STATE_VERBOSE_P (sd))
 190     sim_info (sd, 0);
 191
 192   /* Shutdown the simulator.  */
 193   sim_close (sd, 0);
 194
 195   /* If reason is sim_exited, then sigrc holds the exit code which we want
 196      to return.  If reason is sim_stopped or sim_signalled, then sigrc holds
 197      the signal that the simulator received; we want to return that to
 198      indicate failure.  */
 199
 200   /* Why did we stop? */
 201   switch (reason)
 202     {
 203     case sim_signalled:
 204     case sim_stopped:
 205       if (sigrc != 0)
 206         fprintf (stderr, "program stopped with signal %d.\n", sigrc);
 207       break;
 208
 209     case sim_exited:
 210       break;
 211
 212     default:
 213       fprintf (stderr, "program in undefined state (%d:%d)\n", reason, sigrc);
 214       break;
 215
 216     }
 217
 218   return sigrc;
 219 }
 220
 221 static void
 222 usage ()
 223 {
 224   fprintf (stderr, "Usage: %s [options] program [program args]\n", myname);
 225   fprintf (stderr, "Run `%s --help' for full list of options.\n", myname);
 226   exit (1);
 227 }