gdb/linux-tdep.c

   1 /* Target-dependent code for GNU/Linux, architecture independent.
   2
   3    Copyright (C) 2009, 2010, 2011 Free Software Foundation, Inc.
   4
   5    This file is part of GDB.
   6
   7    This program is free software; you can redistribute it and/or modify
   8    it under the terms of the GNU General Public License as published by
   9    the Free Software Foundation; either version 3 of the License, or
  10    (at your option) any later version.
  11
  12    This program is distributed in the hope that it will be useful,
  13    but WITHOUT ANY WARRANTY; without even the implied warranty of
  14    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15    GNU General Public License for more details.
  16
  17    You should have received a copy of the GNU General Public License
  18    along with this program.  If not, see <http://www.gnu.org/licenses/>.  */
  19
  20 #include "defs.h"
  21 #include "gdbtypes.h"
  22 #include "linux-tdep.h"
  23 #include "auxv.h"
  24 #include "target.h"
  25 #include "elf/common.h"
  26 #include "inferior.h"
  27
  28 static struct gdbarch_data *linux_gdbarch_data_handle;
  29
  30 struct linux_gdbarch_data
  31   {
  32     struct type *siginfo_type;
  33   };
  34
  35 static void *
  36 init_linux_gdbarch_data (struct gdbarch *gdbarch)
  37 {
  38   return GDBARCH_OBSTACK_ZALLOC (gdbarch, struct linux_gdbarch_data);
  39 }
  40
  41 static struct linux_gdbarch_data *
  42 get_linux_gdbarch_data (struct gdbarch *gdbarch)
  43 {
  44   return gdbarch_data (gdbarch, linux_gdbarch_data_handle);
  45 }
  46
  47 /* This function is suitable for architectures that don't
  48    extend/override the standard siginfo structure.  */
  49
  50 struct type *
  51 linux_get_siginfo_type (struct gdbarch *gdbarch)
  52 {
  53   struct linux_gdbarch_data *linux_gdbarch_data;
  54   struct type *int_type, *uint_type, *long_type, *void_ptr_type;
  55   struct type *uid_type, *pid_type;
  56   struct type *sigval_type, *clock_type;
  57   struct type *siginfo_type, *sifields_type;
  58   struct type *type;
  59
  60   linux_gdbarch_data = get_linux_gdbarch_data (gdbarch);
  61   if (linux_gdbarch_data->siginfo_type != NULL)
  62     return linux_gdbarch_data->siginfo_type;
  63
  64   int_type = arch_integer_type (gdbarch, gdbarch_int_bit (gdbarch),
  65                                 0, "int");
  66   uint_type = arch_integer_type (gdbarch, gdbarch_int_bit (gdbarch),
  67                                  1, "unsigned int");
  68   long_type = arch_integer_type (gdbarch, gdbarch_long_bit (gdbarch),
  69                                  0, "long");
  70   void_ptr_type = lookup_pointer_type (builtin_type (gdbarch)->builtin_void);
  71
  72   /* sival_t */
  73   sigval_type = arch_composite_type (gdbarch, NULL, TYPE_CODE_UNION);
  74   TYPE_NAME (sigval_type) = xstrdup ("sigval_t");
  75   append_composite_type_field (sigval_type, "sival_int", int_type);
  76   append_composite_type_field (sigval_type, "sival_ptr", void_ptr_type);
  77
  78   /* __pid_t */
  79   pid_type = arch_type (gdbarch, TYPE_CODE_TYPEDEF, TYPE_LENGTH (int_type),
  80                         xstrdup ("__pid_t"));
  81   TYPE_TARGET_TYPE (pid_type) = int_type;
  82   TYPE_TARGET_STUB (pid_type) = 1;
  83
  84   /* __uid_t */
  85   uid_type = arch_type (gdbarch, TYPE_CODE_TYPEDEF, TYPE_LENGTH (uint_type),
  86                         xstrdup ("__uid_t"));
  87   TYPE_TARGET_TYPE (uid_type) = uint_type;
  88   TYPE_TARGET_STUB (uid_type) = 1;
  89
  90   /* __clock_t */
  91   clock_type = arch_type (gdbarch, TYPE_CODE_TYPEDEF, TYPE_LENGTH (long_type),
  92                           xstrdup ("__clock_t"));
  93   TYPE_TARGET_TYPE (clock_type) = long_type;
  94   TYPE_TARGET_STUB (clock_type) = 1;
  95
  96   /* _sifields */
  97   sifields_type = arch_composite_type (gdbarch, NULL, TYPE_CODE_UNION);
  98
  99   {
 100     const int si_max_size = 128;
 101     int si_pad_size;
 102     int size_of_int = gdbarch_int_bit (gdbarch) / HOST_CHAR_BIT;
 103
 104     /* _pad */
 105     if (gdbarch_ptr_bit (gdbarch) == 64)
 106       si_pad_size = (si_max_size / size_of_int) - 4;
 107     else
 108       si_pad_size = (si_max_size / size_of_int) - 3;
 109     append_composite_type_field (sifields_type, "_pad",
 110                                  init_vector_type (int_type, si_pad_size));
 111   }
 112
 113   /* _kill */
 114   type = arch_composite_type (gdbarch, NULL, TYPE_CODE_STRUCT);
 115   append_composite_type_field (type, "si_pid", pid_type);
 116   append_composite_type_field (type, "si_uid", uid_type);
 117   append_composite_type_field (sifields_type, "_kill", type);
 118
 119   /* _timer */
 120   type = arch_composite_type (gdbarch, NULL, TYPE_CODE_STRUCT);
 121   append_composite_type_field (type, "si_tid", int_type);
 122   append_composite_type_field (type, "si_overrun", int_type);
 123   append_composite_type_field (type, "si_sigval", sigval_type);
 124   append_composite_type_field (sifields_type, "_timer", type);
 125
 126   /* _rt */
 127   type = arch_composite_type (gdbarch, NULL, TYPE_CODE_STRUCT);
 128   append_composite_type_field (type, "si_pid", pid_type);
 129   append_composite_type_field (type, "si_uid", uid_type);
 130   append_composite_type_field (type, "si_sigval", sigval_type);
 131   append_composite_type_field (sifields_type, "_rt", type);
 132
 133   /* _sigchld */
 134   type = arch_composite_type (gdbarch, NULL, TYPE_CODE_STRUCT);
 135   append_composite_type_field (type, "si_pid", pid_type);
 136   append_composite_type_field (type, "si_uid", uid_type);
 137   append_composite_type_field (type, "si_status", int_type);
 138   append_composite_type_field (type, "si_utime", clock_type);
 139   append_composite_type_field (type, "si_stime", clock_type);
 140   append_composite_type_field (sifields_type, "_sigchld", type);
 141
 142   /* _sigfault */
 143   type = arch_composite_type (gdbarch, NULL, TYPE_CODE_STRUCT);
 144   append_composite_type_field (type, "si_addr", void_ptr_type);
 145   append_composite_type_field (sifields_type, "_sigfault", type);
 146
 147   /* _sigpoll */
 148   type = arch_composite_type (gdbarch, NULL, TYPE_CODE_STRUCT);
 149   append_composite_type_field (type, "si_band", long_type);
 150   append_composite_type_field (type, "si_fd", int_type);
 151   append_composite_type_field (sifields_type, "_sigpoll", type);
 152
 153   /* struct siginfo */
 154   siginfo_type = arch_composite_type (gdbarch, NULL, TYPE_CODE_STRUCT);
 155   TYPE_NAME (siginfo_type) = xstrdup ("siginfo");
 156   append_composite_type_field (siginfo_type, "si_signo", int_type);
 157   append_composite_type_field (siginfo_type, "si_errno", int_type);
 158   append_composite_type_field (siginfo_type, "si_code", int_type);
 159   append_composite_type_field_aligned (siginfo_type,
 160                                        "_sifields", sifields_type,
 161                                        TYPE_LENGTH (long_type));
 162
 163   linux_gdbarch_data->siginfo_type = siginfo_type;
 164
 165   return siginfo_type;
 166 }
 167
 168 int
 169 linux_has_shared_address_space (void)
 170 {
 171   /* Determine whether we are running on uClinux or normal Linux
 172      kernel.  */
 173   CORE_ADDR dummy;
 174   int target_is_uclinux;
 175
 176   target_is_uclinux
 177     = (target_auxv_search (&current_target, AT_NULL, &dummy) > 0
 178        && target_auxv_search (&current_target, AT_PAGESZ, &dummy) == 0);
 179
 180   return target_is_uclinux;
 181 }
 182
 183 /* This is how we want PTIDs from core files to be printed.  */
 184
 185 static char *
 186 linux_core_pid_to_str (struct gdbarch *gdbarch, ptid_t ptid)
 187 {
 188   static char buf[80];
 189
 190   if (ptid_get_lwp (ptid) != 0)
 191     {
 192       snprintf (buf, sizeof (buf), "LWP %ld", ptid_get_lwp (ptid));
 193       return buf;
 194     }
 195
 196   return normal_pid_to_str (ptid);
 197 }
 198
 199 /* To be called from the various GDB_OSABI_LINUX handlers for the
 200    various GNU/Linux architectures and machine types.  */
 201
 202 void
 203 linux_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch)
 204 {
 205   set_gdbarch_core_pid_to_str (gdbarch, linux_core_pid_to_str);
 206 }
 207
 208 void
 209 _initialize_linux_tdep (void)
 210 {
 211   linux_gdbarch_data_handle =
 212     gdbarch_data_register_post_init (init_linux_gdbarch_data);
 213 }