Initial creation of sourceware repositorygdb-4_18-branchpoint

1 files changed, 318 insertions, 0 deletions

diff --git a/sim/ppc/main.c b/sim/ppc/main.c
new file mode 100644
index 0000000..a2948e0
--- /dev/null
+++ b/sim/ppc/main.c
@@ -0,0 +1,318 @@
+/*  This file is part of the program psim.
+
+    Copyright (C) 1994-1997, Andrew Cagney <cagney@highland.com.au>
+
+    This program is free software; you can redistribute it and/or modify
+    it under the terms of the GNU General Public License as published by
+    the Free Software Foundation; either version 2 of the License, or
+    (at your option) any later version.
+
+    This program is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+    GNU General Public License for more details.
+ 
+    You should have received a copy of the GNU General Public License
+    along with this program; if not, write to the Free Software
+    Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
+ 
+    */
+
+
+#include <stdarg.h>
+#include <stdio.h>
+#include <fcntl.h>
+
+#include <signal.h>
+
+#include "psim.h"
+#include "options.h"
+#include "device.h" /* FIXME: psim should provide the interface */
+#include "events.h" /* FIXME: psim should provide the interface */
+
+#ifdef HAVE_STDLIB_H
+#include <stdlib.h>
+#endif
+
+#ifdef HAVE_UNISTD_H
+#include <unistd.h>
+#endif
+
+#ifdef HAVE_STRING_H
+#include <string.h>
+#else
+#ifdef HAVE_STRINGS_H
+#include <strings.h>
+#endif
+#endif
+
+#include <errno.h>
+
+#if !defined(O_NDELAY) || !defined(F_GETFL) || !defined(F_SETFL)
+#undef WITH_STDIO
+#define WITH_STDIO DO_USE_STDIO
+#endif
+
+
+extern char **environ;
+
+static psim *simulation = NULL;
+
+
+void
+sim_io_poll_quit (void)
+{
+  /* nothing to do */
+}
+
+void
+sim_io_printf_filtered(const char *msg, ...)
+{
+  va_list ap;
+  va_start(ap, msg);
+  vprintf(msg, ap);
+  va_end(ap);
+}
+
+void
+error (const char *msg, ...)
+{
+  va_list ap;
+  va_start(ap, msg);
+  vprintf(msg, ap);
+  printf("\n");
+  va_end(ap);
+
+  /* any final clean up */
+  if (ppc_trace[trace_print_info] && simulation != NULL)
+    psim_print_info (simulation, ppc_trace[trace_print_info]);
+
+  exit (1);
+}
+
+int
+sim_io_write_stdout(const char *buf,
+		    int sizeof_buf)
+{
+  switch (CURRENT_STDIO) {
+  case DO_USE_STDIO:
+    {
+      int i;
+      for (i = 0; i < sizeof_buf; i++) {
+	putchar(buf[i]);
+      }
+      return i;
+    }
+    break;
+  case DONT_USE_STDIO:
+    return write(1, buf, sizeof_buf);
+    break;
+  default:
+    error("sim_io_write_stdout: invalid switch\n");
+  }
+  return 0;
+}
+
+int
+sim_io_write_stderr(const char *buf,
+		    int sizeof_buf)
+{
+  switch (CURRENT_STDIO) {
+  case DO_USE_STDIO:
+    {
+      int i;
+      for (i = 0; i < sizeof_buf; i++) {
+	fputc(buf[i], stderr);
+      }
+      return i;
+    }
+    break;
+  case DONT_USE_STDIO:
+    return write(2, buf, sizeof_buf);
+    break;
+  default:
+    error("sim_io_write_stdout: invalid switch\n");
+  }
+  return 0;
+}
+
+int
+sim_io_read_stdin(char *buf,
+		  int sizeof_buf)
+{
+  switch (CURRENT_STDIO) {
+  case DO_USE_STDIO:
+    if (sizeof_buf > 1) {
+      if (fgets(buf, sizeof_buf, stdin) != NULL)
+	return strlen(buf);
+    }
+    else if (sizeof_buf == 1) {
+      char b[2];
+      if (fgets(b, sizeof(b), stdin) != NULL) {
+	memcpy(buf, b, strlen(b));
+	return strlen(b);
+      }
+    }
+    else if (sizeof_buf == 0)
+      return 0;
+    return sim_io_eof;
+    break;
+  case DONT_USE_STDIO:
+#if defined(O_NDELAY) && defined(F_GETFL) && defined(F_SETFL)
+    {
+      /* check for input */
+      int flags;
+      int status;
+      int nr_read;
+      int result;
+      /* get the old status */
+      flags = fcntl(0, F_GETFL, 0);
+      if (flags == -1) {
+	perror("sim_io_read_stdin");
+	return sim_io_eof;
+      }
+      /* temp, disable blocking IO */
+      status = fcntl(0, F_SETFL, flags | O_NDELAY);
+      if (status == -1) {
+	perror("sim_io_read_stdin");
+	return sim_io_eof;
+      }
+      /* try for input */
+      nr_read = read(0, buf, sizeof_buf);
+      if (nr_read > 0
+	  || (nr_read == 0 && sizeof_buf == 0))
+	result = nr_read;
+      else if (nr_read == 0)
+	result = sim_io_eof;
+      else { /* nr_read < 0 */
+	if (errno == EAGAIN)
+	  result = sim_io_not_ready;
+	else 
+	  result = sim_io_eof;
+      }
+      /* return to regular vewing */
+      status = fcntl(0, F_SETFL, flags);
+      if (status == -1) {
+	perror("sim_io_read_stdin");
+	return sim_io_eof;
+      }
+      return result;
+    }
+    break;
+#endif
+  default:
+    error("sim_io_read_stdin: invalid switch\n");
+    break;
+  }
+  return 0;
+}
+
+void
+sim_io_flush_stdoutput(void)
+{
+  switch (CURRENT_STDIO) {
+  case DO_USE_STDIO:
+    fflush (stdout);
+    break;
+  case DONT_USE_STDIO:
+    break;
+  default:
+    error("sim_io_flush_stdoutput: invalid switch\n");
+    break;
+  }
+}
+
+
+void *
+zalloc(long size)
+{
+  void *memory = malloc(size);
+  if (memory == NULL)
+    error("zmalloc failed\n");
+  memset(memory, 0, size);
+  return memory;
+}
+
+void
+zfree(void *chunk)
+{
+  free(chunk);
+}
+
+/* When a CNTRL-C occures, queue an event to shut down the simulation */
+
+static RETSIGTYPE
+cntrl_c(int sig)
+{
+  psim_stop (simulation);
+}
+
+
+int
+main(int argc, char **argv)
+{
+  const char *name_of_file;
+  char *arg_;
+  psim_status status;
+  device *root = psim_tree();
+
+  /* parse the arguments */
+  argv = psim_options(root, argv + 1);
+  if (argv[0] == NULL) {
+    if (ppc_trace[trace_opts]) {
+      print_options ();
+      return 0;
+    } else {
+      psim_usage(0);
+    }
+  }
+  name_of_file = argv[0];
+
+  if (ppc_trace[trace_opts])
+    print_options ();
+
+  /* create the simulator */
+  simulation = psim_create(name_of_file, root);
+
+  /* fudge the environment so that _=prog-name */
+  arg_ = (char*)zalloc(strlen(argv[0]) + strlen("_=") + 1);
+  strcpy(arg_, "_=");
+  strcat(arg_, argv[0]);
+  putenv(arg_);
+
+  /* initialize it */
+  psim_init(simulation);
+  psim_stack(simulation, argv, environ);
+
+  {
+    RETSIGTYPE (*prev) ();
+    prev = signal(SIGINT, cntrl_c);
+    psim_run(simulation);
+    signal(SIGINT, prev);
+  }
+
+  /* any final clean up */
+  if (ppc_trace[trace_print_info])
+    psim_print_info (simulation, ppc_trace[trace_print_info]);
+
+  /* why did we stop */
+  status = psim_get_status(simulation);
+  switch (status.reason) {
+  case was_continuing:
+    error("psim: continuing while stoped!\n");
+    return 0;
+  case was_trap:
+    error("psim: no trap insn\n");
+    return 0;
+  case was_exited:
+    return status.signal;
+  case was_signalled:
+    printf ("%s: Caught signal %d at address 0x%lx\n",
+ 	    name_of_file, (int)status.signal,
+ 	    (long)status.program_counter);
+    return status.signal;
+  default:
+    error("unknown halt condition\n");
+    return 0;
+  }
+}