1/* New version of run front end support for simulators.
2   Copyright (C) 1997, 2004, 2007, 2008, 2009, 2010, 2011
3   Free Software Foundation, Inc.
4
5This program is free software; you can redistribute it and/or modify
6it under the terms of the GNU General Public License as published by
7the Free Software Foundation; either version 3 of the License, or
8(at your option) any later version.
9
10This program is distributed in the hope that it will be useful,
11but WITHOUT ANY WARRANTY; without even the implied warranty of
12MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
13GNU General Public License for more details.
14
15You should have received a copy of the GNU General Public License
16along with this program.  If not, see <http://www.gnu.org/licenses/>.  */
17
18#include <signal.h>
19#include "sim-main.h"
20
21#include "bfd.h"
22
23#ifdef HAVE_ENVIRON
24extern char **environ;
25#endif
26
27#ifdef HAVE_UNISTD_H
28/* For chdir.  */
29#include <unistd.h>
30#endif
31
32static void usage (void);
33
34extern host_callback default_callback;
35
36static char *myname;
37
38static SIM_DESC sd;
39
40static RETSIGTYPE
41cntrl_c (int sig)
42{
43  if (! sim_stop (sd))
44    {
45      fprintf (stderr, "Quit!\n");
46      exit (1);
47    }
48}
49
50int
51main (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
221static void
222usage (void)
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}
228