import gdb-1999-08-09 snapshot

1 files changed, 239 insertions, 0 deletions

diff --git a/gdb/kod.c b/gdb/kod.c
new file mode 100644
index 0000000..a096910
--- /dev/null
+++ b/gdb/kod.c
@@ -0,0 +1,239 @@
+/* Kernel Object Display generic routines and callbacks
+   Copyright 1998, 1999 Free Software Foundation, Inc.
+
+   Written by Fernando Nasser <fnasser@cygnus.com> for Cygnus Solutions.
+
+   This file is part of GDB.
+
+   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 "defs.h"
+#include "command.h"
+#include "gdbcmd.h"
+#include "target.h"
+#include "gdb_string.h"
+
+/* Prototypes for exported functions.  */
+void _initialize_kod (void);
+
+/* Prototypes for local functions.  */
+static void show_kod (char *, int);
+static void info_kod_command (char *, int);
+static void load_kod_library (char *);
+
+/* Prototypes for callbacks.  These are passed into the KOD modules.  */
+static void gdb_kod_display (char *);
+static void gdb_kod_query (char *, char *, int *);
+
+/* These functions are imported from the KOD module.
+   
+   gdb_kod_open - initiates the KOD connection to the remote.  The
+   first argument is the display function the module should use to
+   communicate with the user.  The second argument is the query
+   function the display should use to communicate with the target.
+   This should call error() if there is an error.  Otherwise it should
+   return a malloc()d string of the form:
+   
+   NAME VERSION - DESCRIPTION
+   
+   Neither NAME nor VERSION should contain a hyphen.
+
+   
+   gdb_kod_request - This is used when the user enters an "info
+   <module>" request.  The remaining arguments are passed as the first
+   argument.  The second argument is the standard `from_tty'
+   argument.
+
+   
+   gdb_kod_close - This is called when the KOD connection to the
+   remote should be terminated.  */
+
+static char *(*gdb_kod_open) (void *, void *);
+static void (*gdb_kod_request) (char *, int);
+static void (*gdb_kod_close) ();
+
+
+/* Name of inferior's operating system.  */
+char *operating_system;
+
+/* We save a copy of the OS so that we can properly reset when
+   switching OS's.  */
+static char *old_operating_system;
+
+/* Functions imported from the library for all supported OSes.
+   FIXME: we really should do something better, such as dynamically
+   loading the KOD modules.  */
+extern char *ecos_kod_open (void *, void *);
+extern void ecos_kod_request (char *, int);
+extern void ecos_kod_close ();
+extern char *cisco_kod_open (void *, void *);
+extern void cisco_kod_request (char *, int);
+extern void cisco_kod_close ();
+
+
+/* Print a line of data generated by the module.  */
+
+static void
+gdb_kod_display (char *arg)
+{
+  printf_filtered ("%s", arg);
+}
+
+/* Queries the target on behalf of the module.  */
+
+static void
+gdb_kod_query (char *arg, char *result, int *maxsiz)
+{
+  int bufsiz = 0;
+
+  /* Check if current target has remote_query capabilities.
+     If not, it does not have kod either.  */
+  if (! current_target.to_query)
+    {
+      strcpy (result,
+              "ERR: Kernel Object Display not supported by current target\n");
+      return;
+    }
+
+  /* Just get the maximum buffer size.  */
+  target_query ((int) 'K', 0, 0, &bufsiz);
+
+  /* Check if *we* were called just for getting the buffer size.  */
+  if (*maxsiz == 0)
+    {
+      *maxsiz = bufsiz;
+      strcpy (result, "OK");
+      return;
+    }
+
+  /* Check if caller can handle a buffer this large, if not, adjust.  */
+  if (bufsiz > *maxsiz)
+    bufsiz = *maxsiz;
+
+  /* See if buffer can hold the query (usually it can, as the query is
+     short).  */
+  if (strlen (arg) >= bufsiz)
+    error ("kod: query argument too long");
+
+  /* Send actual request.  */
+  if (target_query ((int) 'K', arg, result, &bufsiz))
+    strcpy (result, "ERR: remote query failed");
+}
+
+/* Print name of kod command after selecting the appropriate kod
+   formatting library module.  As a side effect we create a new "info"
+   subcommand which is what the user actually uses to query the OS.  */
+
+static void
+kod_set_os (char *arg, int from_tty, struct cmd_list_element *command)
+{
+  char *p;
+
+  if (command->type != set_cmd)
+    return;
+
+  /* If we had already had an open OS, close it.  */
+  if (gdb_kod_close)
+    (*gdb_kod_close) ();
+
+  /* Also remove the old OS's command.  */
+  if (old_operating_system)
+    {
+      delete_cmd (old_operating_system, &infolist);
+      free (old_operating_system);
+    }
+  old_operating_system = strdup (operating_system);
+
+  if (! operating_system || ! *operating_system)
+    {
+      /* If user set operating system to empty, we want to forget we
+	 had a module open.  Setting these variables is just nice for
+	 debugging and clarity.  */
+      gdb_kod_open = NULL;
+      gdb_kod_request = NULL;
+      gdb_kod_close = NULL;
+    }
+  else
+    {
+      char *kodlib;
+
+      load_kod_library (operating_system);
+
+      kodlib = (*gdb_kod_open) (gdb_kod_display, gdb_kod_query);
+
+      /* Add kod related info commands to gdb.  */
+      add_info (operating_system, info_kod_command,
+		"Displays information about Kernel Objects.");
+
+      p = strrchr (kodlib, '-');
+      if (p != NULL)
+	p++;
+      else
+	p = "Unknown KOD library";
+      printf_filtered ("%s - %s\n", operating_system, p);
+
+      free (kodlib);
+    }
+}
+
+/* Print information about currently known kernel objects of the
+   specified type or a list of all known kernel object types if
+   argument is empty.  */
+
+static void
+info_kod_command (char *arg, int from_tty)
+{
+  (*gdb_kod_request) (arg, from_tty);
+}
+
+/* Print name of kod command after selecting the appropriate kod
+   formatting library module.  */
+
+static void
+load_kod_library (char *lib)
+{
+#if 0
+  /* FIXME: Don't have the eCos code here.  */
+  if (! strcmp (lib, "ecos"))
+    {
+      gdb_kod_open = ecos_kod_open;
+      gdb_kod_request = ecos_kod_request;
+      gdb_kod_close = ecos_kod_close;
+    }
+  else
+#endif /* 0 */
+   if (! strcmp (lib, "cisco"))
+    {
+      gdb_kod_open = cisco_kod_open;
+      gdb_kod_request = cisco_kod_request;
+      gdb_kod_close = cisco_kod_close;
+    }
+  else
+    error ("Unknown operating system: %s\n", operating_system);
+}
+
+void
+_initialize_kod ()
+{
+  struct cmd_list_element *c;
+
+  c = add_set_cmd ("os", no_class, var_string,
+		   (char *) &operating_system,
+		   "Set operating system",
+		   &setlist);
+  c->function.sfunc = kod_set_os;
+  add_show_from_set (c, &showlist);
+}