1/* New version of run front end support for simulators.
2   Copyright (C) 1997, 2004, 2007 Free Software Foundation, Inc.
3
4This program is free software; you can redistribute it and/or modify
5it under the terms of the GNU General Public License as published by
6the Free Software Foundation; either version 3 of the License, or
7(at your option) any later version.
8
9This program is distributed in the hope that it will be useful,
10but WITHOUT ANY WARRANTY; without even the implied warranty of
11MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
12GNU General Public License for more details.
13
14You should have received a copy of the GNU General Public License
15along with this program.  If not, see <http://www.gnu.org/licenses/>.  */
16
17#include <signal.h>
18#include "sim-main.h"
19
20#include "bfd.h"
21
22#ifdef HAVE_ENVIRON
23extern char **environ;
24#endif
25
26#ifdef HAVE_UNISTD_H
27/* For chdir.  */
28#include <unistd.h>
29#endif
30
31static void usage (void);
32
33extern host_callback default_callback;
34
35static char *myname;
36
37static SIM_DESC sd;
38
39static RETSIGTYPE
40cntrl_c (int sig)
41{
42  if (! sim_stop (sd))
43    {
44      fprintf (stderr, "Quit!\n");
45      exit (1);
46    }
47}
48
49int
50main (int argc, char **argv)
51{
52  char *name;
53  char **prog_argv = NULL;
54  struct bfd *prog_bfd;
55  enum sim_stop reason;
56  int sigrc = 0;
57  int single_step = 0;
58  RETSIGTYPE (*prev_sigint) ();
59
60  myname = argv[0] + strlen (argv[0]);
61  while (myname > argv[0] && myname[-1] != '/')
62    --myname;
63
64  /* INTERNAL: When MYNAME is `step', single step the simulator
65     instead of allowing it to run free.  The sole purpose of this
66     HACK is to allow the sim_resume interface's step argument to be
67     tested without having to build/run gdb. */
68  if (strlen (myname) > 4 && strcmp (myname - 4, "step") == 0)
69    {
70      single_step = 1;
71    }
72
73  /* Create an instance of the simulator.  */
74  default_callback.init (&default_callback);
75  sd = sim_open (SIM_OPEN_STANDALONE, &default_callback, NULL, argv);
76  if (sd == 0)
77    exit (1);
78  if (STATE_MAGIC (sd) != SIM_MAGIC_NUMBER)
79    {
80      fprintf (stderr, "Internal error - bad magic number in simulator struct\n");
81      abort ();
82    }
83
84  /* We can't set the endianness in the callback structure until
85     sim_config is called, which happens in sim_open.  */
86  default_callback.target_endian
87    = (CURRENT_TARGET_BYTE_ORDER == BIG_ENDIAN
88       ? BFD_ENDIAN_BIG : BFD_ENDIAN_LITTLE);
89
90  /* Was there a program to run?  */
91  prog_argv = STATE_PROG_ARGV (sd);
92  prog_bfd = STATE_PROG_BFD (sd);
93  if (prog_argv == NULL || *prog_argv == NULL)
94    usage ();
95
96  name = *prog_argv;
97
98  /* For simulators that don't open prog during sim_open() */
99  if (prog_bfd == NULL)
100    {
101      prog_bfd = bfd_openr (name, 0);
102      if (prog_bfd == NULL)
103	{
104	  fprintf (stderr, "%s: can't open \"%s\": %s\n",
105		   myname, name, bfd_errmsg (bfd_get_error ()));
106	  exit (1);
107	}
108      if (!bfd_check_format (prog_bfd, bfd_object))
109	{
110	  fprintf (stderr, "%s: \"%s\" is not an object file: %s\n",
111		   myname, name, bfd_errmsg (bfd_get_error ()));
112	  exit (1);
113	}
114    }
115
116  if (STATE_VERBOSE_P (sd))
117    printf ("%s %s\n", myname, name);
118
119  /* Load the program into the simulator.  */
120  if (sim_load (sd, name, prog_bfd, 0) == SIM_RC_FAIL)
121    exit (1);
122
123  /* Prepare the program for execution.  */
124#ifdef HAVE_ENVIRON
125  sim_create_inferior (sd, prog_bfd, prog_argv, environ);
126#else
127  sim_create_inferior (sd, prog_bfd, prog_argv, NULL);
128#endif
129
130  /* To accommodate relative file paths, chdir to sysroot now.  We
131     mustn't do this until BFD has opened the program, else we wouldn't
132     find the executable if it has a relative file path.  */
133  if (simulator_sysroot[0] != '\0' && chdir (simulator_sysroot) < 0)
134    {
135      fprintf (stderr, "%s: can't change directory to \"%s\"\n",
136	       myname, simulator_sysroot);
137      exit (1);
138    }
139
140  /* Run/Step the program.  */
141  if (single_step)
142    {
143      do
144	{
145	  prev_sigint = signal (SIGINT, cntrl_c);
146	  sim_resume (sd, 1/*step*/, 0);
147	  signal (SIGINT, prev_sigint);
148	  sim_stop_reason (sd, &reason, &sigrc);
149
150	  if ((reason == sim_stopped) &&
151	      (sigrc == sim_signal_to_host (sd, SIM_SIGINT)))
152	    break; /* exit on control-C */
153	}
154      /* remain on breakpoint or signals in oe mode*/
155      while (((reason == sim_signalled) &&
156	      (sigrc == sim_signal_to_host (sd, SIM_SIGTRAP))) ||
157	     ((reason == sim_stopped) &&
158	      (STATE_ENVIRONMENT (sd) == OPERATING_ENVIRONMENT)));
159    }
160  else
161    {
162      do
163	{
164#if defined (HAVE_SIGACTION) && defined (SA_RESTART)
165	  struct sigaction sa, osa;
166	  sa.sa_handler = cntrl_c;
167	  sigemptyset (&sa.sa_mask);
168	  sa.sa_flags = 0;
169	  sigaction (SIGINT, &sa, &osa);
170	  prev_sigint = osa.sa_handler;
171#else
172	  prev_sigint = signal (SIGINT, cntrl_c);
173#endif
174	  sim_resume (sd, 0, sigrc);
175	  signal (SIGINT, prev_sigint);
176	  sim_stop_reason (sd, &reason, &sigrc);
177
178	  if ((reason == sim_stopped) &&
179	      (sigrc == sim_signal_to_host (sd, SIM_SIGINT)))
180	    break; /* exit on control-C */
181
182	  /* remain on signals in oe mode */
183	} while ((reason == sim_stopped) &&
184		 (STATE_ENVIRONMENT (sd) == OPERATING_ENVIRONMENT));
185
186    }
187  /* Print any stats the simulator collected.  */
188  if (STATE_VERBOSE_P (sd))
189    sim_info (sd, 0);
190
191  /* Shutdown the simulator.  */
192  sim_close (sd, 0);
193
194  /* If reason is sim_exited, then sigrc holds the exit code which we want
195     to return.  If reason is sim_stopped or sim_signalled, then sigrc holds
196     the signal that the simulator received; we want to return that to
197     indicate failure.  */
198
199  /* Why did we stop? */
200  switch (reason)
201    {
202    case sim_signalled:
203    case sim_stopped:
204      if (sigrc != 0)
205        fprintf (stderr, "program stopped with signal %d.\n", sigrc);
206      break;
207
208    case sim_exited:
209      break;
210
211    default:
212      fprintf (stderr, "program in undefined state (%d:%d)\n", reason, sigrc);
213      break;
214
215    }
216
217  return sigrc;
218}
219
220static void
221usage ()
222{
223  fprintf (stderr, "Usage: %s [options] program [program args]\n", myname);
224  fprintf (stderr, "Run `%s --help' for full list of options.\n", myname);
225  exit (1);
226}
227