gdb/kod.c

   1 /* Kernel Object Display generic routines and callbacks
   2    Copyright 1998, 1999 Free Software Foundation, Inc.
   3
   4    Written by Fernando Nasser <fnasser@cygnus.com> for Cygnus Solutions.
   5
   6    This file is part of GDB.
   7
   8    This program is free software; you can redistribute it and/or modify
   9    it under the terms of the GNU General Public License as published by
  10    the Free Software Foundation; either version 2 of the License, or
  11    (at your option) any later version.
  12
  13    This program is distributed in the hope that it will be useful,
  14    but WITHOUT ANY WARRANTY; without even the implied warranty of
  15    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16    GNU General Public License for more details.
  17
  18    You should have received a copy of the GNU General Public License
  19    along with this program; if not, write to the Free Software
  20    Foundation, Inc., 59 Temple Place - Suite 330,
  21    Boston, MA 02111-1307, USA.  */
  22
  23 #include "defs.h"
  24 #include "command.h"
  25 #include "gdbcmd.h"
  26 #include "target.h"
  27 #include "gdb_string.h"
  28
  29 /* Prototypes for exported functions.  */
  30 void _initialize_kod (void);
  31
  32 /* Prototypes for local functions.  */
  33 static void show_kod (char *, int);
  34 static void info_kod_command (char *, int);
  35 static void load_kod_library (char *);
  36
  37 /* Prototypes for callbacks.  These are passed into the KOD modules.  */
  38 static void gdb_kod_display (char *);
  39 static void gdb_kod_query (char *, char *, int *);
  40
  41 /* These functions are imported from the KOD module.
  42
  43    gdb_kod_open - initiates the KOD connection to the remote.  The
  44    first argument is the display function the module should use to
  45    communicate with the user.  The second argument is the query
  46    function the display should use to communicate with the target.
  47    This should call error() if there is an error.  Otherwise it should
  48    return a malloc()d string of the form:
  49
  50    NAME VERSION - DESCRIPTION
  51
  52    Neither NAME nor VERSION should contain a hyphen.
  53
  54
  55    gdb_kod_request - This is used when the user enters an "info
  56    <module>" request.  The remaining arguments are passed as the first
  57    argument.  The second argument is the standard `from_tty'
  58    argument.
  59
  60
  61    gdb_kod_close - This is called when the KOD connection to the
  62    remote should be terminated.  */
  63
  64 static char *(*gdb_kod_open) (void *, void *);
  65 static void (*gdb_kod_request) (char *, int);
  66 static void (*gdb_kod_close) ();
  67
  68
  69 /* Name of inferior's operating system.  */
  70 char *operating_system;
  71
  72 /* We save a copy of the OS so that we can properly reset when
  73    switching OS's.  */
  74 static char *old_operating_system;
  75
  76 /* Functions imported from the library for all supported OSes.
  77    FIXME: we really should do something better, such as dynamically
  78    loading the KOD modules.  */
  79 extern char *ecos_kod_open (void *, void *);
  80 extern void ecos_kod_request (char *, int);
  81 extern void ecos_kod_close ();
  82 extern char *cisco_kod_open (void *, void *);
  83 extern void cisco_kod_request (char *, int);
  84 extern void cisco_kod_close ();
  85
  86
  87 /* Print a line of data generated by the module.  */
  88
  89 static void
  90 gdb_kod_display (char *arg)
  91 {
  92   printf_filtered ("%s", arg);
  93 }
  94
  95 /* Queries the target on behalf of the module.  */
  96
  97 static void
  98 gdb_kod_query (char *arg, char *result, int *maxsiz)
  99 {
 100   int bufsiz = 0;
 101
 102   /* Check if current target has remote_query capabilities.
 103      If not, it does not have kod either.  */
 104   if (! current_target.to_query)
 105     {
 106       strcpy (result,
 107               "ERR: Kernel Object Display not supported by current target\n");
 108       return;
 109     }
 110
 111   /* Just get the maximum buffer size.  */
 112   target_query ((int) 'K', 0, 0, &bufsiz);
 113
 114   /* Check if *we* were called just for getting the buffer size.  */
 115   if (*maxsiz == 0)
 116     {
 117       *maxsiz = bufsiz;
 118       strcpy (result, "OK");
 119       return;
 120     }
 121
 122   /* Check if caller can handle a buffer this large, if not, adjust.  */
 123   if (bufsiz > *maxsiz)
 124     bufsiz = *maxsiz;
 125
 126   /* See if buffer can hold the query (usually it can, as the query is
 127      short).  */
 128   if (strlen (arg) >= bufsiz)
 129     error ("kod: query argument too long");
 130
 131   /* Send actual request.  */
 132   if (target_query ((int) 'K', arg, result, &bufsiz))
 133     strcpy (result, "ERR: remote query failed");
 134 }
 135
 136 /* Print name of kod command after selecting the appropriate kod
 137    formatting library module.  As a side effect we create a new "info"
 138    subcommand which is what the user actually uses to query the OS.  */
 139
 140 static void
 141 kod_set_os (char *arg, int from_tty, struct cmd_list_element *command)
 142 {
 143   char *p;
 144
 145   if (command->type != set_cmd)
 146     return;
 147
 148   /* If we had already had an open OS, close it.  */
 149   if (gdb_kod_close)
 150     (*gdb_kod_close) ();
 151
 152   /* Also remove the old OS's command.  */
 153   if (old_operating_system)
 154     {
 155       delete_cmd (old_operating_system, &infolist);
 156       free (old_operating_system);
 157     }
 158   old_operating_system = strdup (operating_system);
 159
 160   if (! operating_system || ! *operating_system)
 161     {
 162       /* If user set operating system to empty, we want to forget we
 163          had a module open.  Setting these variables is just nice for
 164          debugging and clarity.  */
 165       gdb_kod_open = NULL;
 166       gdb_kod_request = NULL;
 167       gdb_kod_close = NULL;
 168     }
 169   else
 170     {
 171       char *kodlib;
 172
 173       load_kod_library (operating_system);
 174
 175       kodlib = (*gdb_kod_open) (gdb_kod_display, gdb_kod_query);
 176
 177       /* Add kod related info commands to gdb.  */
 178       add_info (operating_system, info_kod_command,
 179                 "Displays information about Kernel Objects.");
 180
 181       p = strrchr (kodlib, '-');
 182       if (p != NULL)
 183         p++;
 184       else
 185         p = "Unknown KOD library";
 186       printf_filtered ("%s - %s\n", operating_system, p);
 187
 188       free (kodlib);
 189     }
 190 }
 191
 192 /* Print information about currently known kernel objects of the
 193    specified type or a list of all known kernel object types if
 194    argument is empty.  */
 195
 196 static void
 197 info_kod_command (char *arg, int from_tty)
 198 {
 199   (*gdb_kod_request) (arg, from_tty);
 200 }
 201
 202 /* Print name of kod command after selecting the appropriate kod
 203    formatting library module.  */
 204
 205 static void
 206 load_kod_library (char *lib)
 207 {
 208 #if 0
 209   /* FIXME: Don't have the eCos code here.  */
 210   if (! strcmp (lib, "ecos"))
 211     {
 212       gdb_kod_open = ecos_kod_open;
 213       gdb_kod_request = ecos_kod_request;
 214       gdb_kod_close = ecos_kod_close;
 215     }
 216   else
 217 #endif /* 0 */
 218    if (! strcmp (lib, "cisco"))
 219     {
 220       gdb_kod_open = cisco_kod_open;
 221       gdb_kod_request = cisco_kod_request;
 222       gdb_kod_close = cisco_kod_close;
 223     }
 224   else
 225     error ("Unknown operating system: %s\n", operating_system);
 226 }
 227
 228 void
 229 _initialize_kod ()
 230 {
 231   struct cmd_list_element *c;
 232
 233   c = add_set_cmd ("os", no_class, var_string,
 234                    (char *) &operating_system,
 235                    "Set operating system",
 236                    &setlist);
 237   c->function.sfunc = kod_set_os;
 238   add_show_from_set (c, &showlist);
 239 }