Initial creation of sourceware repositorygdb-4_18-branchpoint

1 files changed, 445 insertions, 0 deletions

diff --git a/sim/ppc/sim_calls.c b/sim/ppc/sim_calls.c
new file mode 100644
index 0000000..bb84539
--- /dev/null
+++ b/sim/ppc/sim_calls.c
@@ -0,0 +1,445 @@
+/*  This file is part of the program psim.
+
+    Copyright (C) 1994-1996,1998, 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 <signal.h> /* FIXME - should be machine dependant version */
+#include <stdarg.h>
+#include <ctype.h>
+
+#include "psim.h"
+#include "options.h"
+
+#undef printf_filtered /* blow away the mapping */
+
+#ifdef HAVE_STDLIB_H
+#include <stdlib.h>
+#endif
+
+#ifdef HAVE_STRING_H
+#include <string.h>
+#else
+#ifdef HAVE_STRINGS_H
+#include <strings.h>
+#endif
+#endif
+
+#include "defs.h"
+#include "bfd.h"
+#include "callback.h"
+#include "remote-sim.h"
+
+
+/* Structures used by the simulator, for gdb just have static structures */
+
+static psim *simulator;
+static device *root_device;
+static host_callback *callbacks;
+
+/* We use GDB's reg_names array to map GDB register numbers onto
+   names, which we can then look up in the register table.
+
+   We used to just use the REGISTER_NAMES macro, from GDB's
+   target-dependent header files.  That was kind of nice, because it
+   meant that libsim.a had only a compile-time dependency on GDB;
+   using reg_names directly means that there are now link-time and
+   run-time dependencies too.
+
+   However, the GDB PPC back-end now modifies the reg_names array when
+   the user runs the `set processor' command, which affects the
+   meanings of the register numbers.  So the sim needs to see the
+   register names GDB is actually using.
+
+   Perhaps the host_callback structure could contain a pointer to the
+   register name table; that would be cleaner.  */
+
+SIM_DESC
+sim_open (SIM_OPEN_KIND kind,
+	  host_callback *callback,
+	  struct _bfd *abfd,
+	  char **argv)
+{
+  callbacks = callback;
+
+  /* Note: The simulation is not created by sim_open() because
+     complete information is not yet available */
+  /* trace the call */
+  TRACE(trace_gdb, ("sim_open called\n"));
+
+  if (root_device != NULL)
+    sim_io_printf_filtered("Warning - re-open of simulator leaks memory\n");
+  root_device = psim_tree();
+  simulator = NULL;
+
+  psim_options(root_device, argv + 1);
+
+  if (ppc_trace[trace_opts])
+    print_options ();
+
+  /* fudge our descriptor for now */
+  return (SIM_DESC) 1;
+}
+
+
+void
+sim_close (SIM_DESC sd, int quitting)
+{
+  TRACE(trace_gdb, ("sim_close(quitting=%d) called\n", quitting));
+  if (ppc_trace[trace_print_info] && simulator != NULL)
+    psim_print_info (simulator, ppc_trace[trace_print_info]);
+}
+
+
+SIM_RC
+sim_load (SIM_DESC sd, char *prog, bfd *abfd, int from_tty)
+{
+  TRACE(trace_gdb, ("sim_load(prog=%s, from_tty=%d) called\n",
+		    prog, from_tty));
+  ASSERT(prog != NULL);
+
+  /* create the simulator */
+  TRACE(trace_gdb, ("sim_load() - first time, create the simulator\n"));
+  simulator = psim_create(prog, root_device);
+
+  /* bring in all the data section */
+  psim_init(simulator);
+
+  /* get the start address */
+  if (abfd == NULL)
+    {
+      abfd = bfd_openr (prog, 0);
+      if (abfd == NULL)
+	error ("psim: can't open \"%s\": %s\n", 
+	       prog, bfd_errmsg (bfd_get_error ()));
+      if (!bfd_check_format (abfd, bfd_object)) 
+	{
+	  const char *errmsg = bfd_errmsg (bfd_get_error ());
+	  bfd_close (abfd);
+	  error ("psim: \"%s\" is not an object file: %s\n",
+		 prog, errmsg);
+	}
+      bfd_close (abfd);
+    }
+
+  return SIM_RC_OK;
+}
+
+
+int
+sim_read (SIM_DESC sd, SIM_ADDR mem, unsigned char *buf, int length)
+{
+  int result = psim_read_memory(simulator, MAX_NR_PROCESSORS,
+				buf, mem, length);
+  TRACE(trace_gdb, ("sim_read(mem=0x%lx, buf=0x%lx, length=%d) = %d\n",
+		    (long)mem, (long)buf, length, result));
+  return result;
+}
+
+
+int
+sim_write (SIM_DESC sd, SIM_ADDR mem, unsigned char *buf, int length)
+{
+  int result = psim_write_memory(simulator, MAX_NR_PROCESSORS,
+				 buf, mem, length,
+				 1/*violate_ro*/);
+  TRACE(trace_gdb, ("sim_write(mem=0x%lx, buf=0x%lx, length=%d) = %d\n",
+		    (long)mem, (long)buf, length, result));
+  return result;
+}
+
+
+int
+sim_fetch_register (SIM_DESC sd, int regno, unsigned char *buf, int length)
+{
+  char *regname;
+
+  if (simulator == NULL) {
+    return 0;
+  }
+
+  /* GDB will sometimes ask for the contents of a register named "";
+     we ignore such requests, and leave garbage in *BUF.  In
+     REG_NAMES, the empty string means "the register with this
+     number is not present in the currently selected architecture
+     variant."  That's following the kludge we're using for the MIPS
+     processors.  But there are loops that just walk through the
+     entire list of names and try to get everything.  */
+  regname = REGISTER_NAME (regno);
+  if (! regname || regname[0] == '\0')
+    return -1;
+
+  TRACE(trace_gdb, ("sim_fetch_register(regno=%d(%s), buf=0x%lx)\n",
+		    regno, regname, (long)buf));
+  psim_read_register(simulator, MAX_NR_PROCESSORS,
+		     buf, regname, raw_transfer);
+  return -1;
+}
+
+
+int
+sim_store_register (SIM_DESC sd, int regno, unsigned char *buf, int length)
+{
+  char *regname;
+
+  if (simulator == NULL)
+    return 0;
+
+  /* See comments in sim_fetch_register, above.  */
+  regname = REGISTER_NAME (regno);
+  if (! regname || regname[0] == '\0')
+    return -1;
+
+  TRACE(trace_gdb, ("sim_store_register(regno=%d(%s), buf=0x%lx)\n",
+		    regno, regname, (long)buf));
+  psim_write_register(simulator, MAX_NR_PROCESSORS,
+		      buf, regname, raw_transfer);
+  return -1;
+}
+
+
+void
+sim_info (SIM_DESC sd, int verbose)
+{
+  TRACE(trace_gdb, ("sim_info(verbose=%d) called\n", verbose));
+  psim_print_info (simulator, verbose);
+}
+
+
+SIM_RC
+sim_create_inferior (SIM_DESC sd,
+		     struct _bfd *abfd,
+		     char **argv,
+		     char **envp)
+{
+  unsigned_word entry_point;
+  TRACE(trace_gdb, ("sim_create_inferior(start_address=0x%x, ...)\n",
+		    entry_point));
+
+  if (simulator == NULL)
+    error ("No program loaded");
+
+  if (abfd != NULL)
+    entry_point = bfd_get_start_address (abfd);
+  else
+    entry_point = 0xfff00000; /* ??? */
+
+  psim_init(simulator);
+  psim_stack(simulator, argv, envp);
+
+  psim_write_register(simulator, -1 /* all start at same PC */,
+		      &entry_point, "pc", cooked_transfer);
+  return SIM_RC_OK;
+}
+
+
+void
+sim_stop_reason (SIM_DESC sd, enum sim_stop *reason, int *sigrc)
+{
+  psim_status status = psim_get_status(simulator);
+
+  switch (status.reason) {
+  case was_continuing:
+    *reason = sim_stopped;
+    if (status.signal == 0)
+      *sigrc = SIGTRAP;
+    else
+      *sigrc = status.signal;
+    break;
+  case was_trap:
+    *reason = sim_stopped;
+    *sigrc = SIGTRAP;
+    break;
+  case was_exited:
+    *reason = sim_exited;
+    *sigrc = status.signal;
+    break;
+  case was_signalled:
+    *reason = sim_signalled;
+    *sigrc = status.signal;
+    break;
+  }
+
+  TRACE(trace_gdb, ("sim_stop_reason(reason=0x%lx(%ld), sigrc=0x%lx(%ld))\n",
+		    (long)reason, (long)*reason, (long)sigrc, (long)*sigrc));
+}
+
+
+
+/* Run (or resume) the program.  */
+
+int
+sim_stop (SIM_DESC sd)
+{
+  psim_stop (simulator);
+  return 1;
+}
+
+void
+sim_resume (SIM_DESC sd, int step, int siggnal)
+{
+  TRACE(trace_gdb, ("sim_resume(step=%d, siggnal=%d)\n",
+		    step, siggnal));
+
+  if (step)
+    {
+      psim_step (simulator);
+    }
+  else
+    {
+      psim_run (simulator);
+    }
+}
+
+void
+sim_do_command (SIM_DESC sd, char *cmd)
+{
+  TRACE(trace_gdb, ("sim_do_commands(cmd=%s) called\n",
+		    cmd ? cmd : "(null)"));
+  if (cmd != NULL) {
+    char **argv = buildargv(cmd);
+    psim_command(root_device, argv);
+    freeargv(argv);
+  }
+}
+
+
+/* Polling, if required */
+
+void
+sim_io_poll_quit (void)
+{
+  if (callbacks->poll_quit != NULL)
+    {
+      if (callbacks->poll_quit (callbacks))
+	psim_stop (simulator);
+    }
+}
+
+
+
+/* Map simulator IO operations onto the corresponding GDB I/O
+   functions.
+   
+   NB: Only a limited subset of operations are mapped across.  More
+   advanced operations (such as dup or write) must either be mapped to
+   one of the below calls or handled internally */
+
+int
+sim_io_read_stdin(char *buf,
+		  int sizeof_buf)
+{
+  switch (CURRENT_STDIO) {
+  case DO_USE_STDIO:
+    return callbacks->read_stdin(callbacks, buf, sizeof_buf);
+    break;
+  case DONT_USE_STDIO:
+    return callbacks->read(callbacks, 0, buf, sizeof_buf);
+    break;
+  default:
+    error("sim_io_read_stdin: unaccounted switch\n");
+    break;
+  }
+  return 0;
+}
+
+int
+sim_io_write_stdout(const char *buf,
+		    int sizeof_buf)
+{
+  switch (CURRENT_STDIO) {
+  case DO_USE_STDIO:
+    return callbacks->write_stdout(callbacks, buf, sizeof_buf);
+    break;
+  case DONT_USE_STDIO:
+    return callbacks->write(callbacks, 1, buf, sizeof_buf);
+    break;
+  default:
+    error("sim_io_write_stdout: unaccounted switch\n");
+    break;
+  }
+  return 0;
+}
+
+int
+sim_io_write_stderr(const char *buf,
+		    int sizeof_buf)
+{
+  switch (CURRENT_STDIO) {
+  case DO_USE_STDIO:
+    /* NB: I think there should be an explicit write_stderr callback */
+    return callbacks->write(callbacks, 3, buf, sizeof_buf);
+    break;
+  case DONT_USE_STDIO:
+    return callbacks->write(callbacks, 3, buf, sizeof_buf);
+    break;
+  default:
+    error("sim_io_write_stderr: unaccounted switch\n");
+    break;
+  }
+  return 0;
+}
+
+
+void
+sim_io_printf_filtered(const char *fmt,
+		       ...)
+{
+  char message[1024];
+  va_list ap;
+  /* format the message */
+  va_start(ap, fmt);
+  vsprintf(message, fmt, ap);
+  va_end(ap);
+  /* sanity check */
+  if (strlen(message) >= sizeof(message))
+    error("sim_io_printf_filtered: buffer overflow\n");
+  callbacks->printf_filtered(callbacks, "%s", message);
+}
+
+void
+sim_io_flush_stdoutput(void)
+{
+  switch (CURRENT_STDIO) {
+  case DO_USE_STDIO:
+    callbacks->flush_stdout (callbacks);
+    break;
+  case DONT_USE_STDIO:
+    break;
+  default:
+    error("sim_io_read_stdin: unaccounted switch\n");
+    break;
+  }
+}
+
+/****/
+
+void *
+zalloc(long size)
+{
+  void *memory = (void*)xmalloc(size);
+  if (memory == NULL)
+    error("xmalloc failed\n");
+  memset(memory, 0, size);
+  return memory;
+}
+
+void zfree(void *data)
+{
+  free(data);
+}