1 /* Target-dependent code for GNU/Linux, architecture independent.
3 Copyright (C) 2009, 2010 Free Software Foundation, Inc.
5 This file is part of GDB.
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.
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.
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/>. */
23 #include "linux-tdep.h"
28 #include "elf/common.h"
30 /* This function is suitable for architectures that don't
31 extend/override the standard siginfo structure. */
34 linux_get_siginfo_type (struct gdbarch
*gdbarch
)
36 struct type
*int_type
, *uint_type
, *long_type
, *void_ptr_type
;
37 struct type
*uid_type
, *pid_type
;
38 struct type
*sigval_type
, *clock_type
;
39 struct type
*siginfo_type
, *sifields_type
;
42 int_type
= arch_integer_type (gdbarch
, gdbarch_int_bit (gdbarch
),
44 uint_type
= arch_integer_type (gdbarch
, gdbarch_int_bit (gdbarch
),
46 long_type
= arch_integer_type (gdbarch
, gdbarch_long_bit (gdbarch
),
48 void_ptr_type
= lookup_pointer_type (builtin_type (gdbarch
)->builtin_void
);
51 sigval_type
= arch_composite_type (gdbarch
, NULL
, TYPE_CODE_UNION
);
52 TYPE_NAME (sigval_type
) = xstrdup ("sigval_t");
53 append_composite_type_field (sigval_type
, "sival_int", int_type
);
54 append_composite_type_field (sigval_type
, "sival_ptr", void_ptr_type
);
57 pid_type
= arch_type (gdbarch
, TYPE_CODE_TYPEDEF
, TYPE_LENGTH (int_type
),
59 TYPE_TARGET_TYPE (pid_type
) = int_type
;
60 TYPE_TARGET_STUB (pid_type
) = 1;
63 uid_type
= arch_type (gdbarch
, TYPE_CODE_TYPEDEF
, TYPE_LENGTH (uint_type
),
65 TYPE_TARGET_TYPE (uid_type
) = uint_type
;
66 TYPE_TARGET_STUB (uid_type
) = 1;
69 clock_type
= arch_type (gdbarch
, TYPE_CODE_TYPEDEF
, TYPE_LENGTH (long_type
),
70 xstrdup ("__clock_t"));
71 TYPE_TARGET_TYPE (clock_type
) = long_type
;
72 TYPE_TARGET_STUB (clock_type
) = 1;
75 sifields_type
= arch_composite_type (gdbarch
, NULL
, TYPE_CODE_UNION
);
78 const int si_max_size
= 128;
80 int size_of_int
= gdbarch_int_bit (gdbarch
) / HOST_CHAR_BIT
;
83 if (gdbarch_ptr_bit (gdbarch
) == 64)
84 si_pad_size
= (si_max_size
/ size_of_int
) - 4;
86 si_pad_size
= (si_max_size
/ size_of_int
) - 3;
87 append_composite_type_field (sifields_type
, "_pad",
88 init_vector_type (int_type
, si_pad_size
));
92 type
= arch_composite_type (gdbarch
, NULL
, TYPE_CODE_STRUCT
);
93 append_composite_type_field (type
, "si_pid", pid_type
);
94 append_composite_type_field (type
, "si_uid", uid_type
);
95 append_composite_type_field (sifields_type
, "_kill", type
);
98 type
= arch_composite_type (gdbarch
, NULL
, TYPE_CODE_STRUCT
);
99 append_composite_type_field (type
, "si_tid", int_type
);
100 append_composite_type_field (type
, "si_overrun", int_type
);
101 append_composite_type_field (type
, "si_sigval", sigval_type
);
102 append_composite_type_field (sifields_type
, "_timer", type
);
105 type
= arch_composite_type (gdbarch
, NULL
, TYPE_CODE_STRUCT
);
106 append_composite_type_field (type
, "si_pid", pid_type
);
107 append_composite_type_field (type
, "si_uid", uid_type
);
108 append_composite_type_field (type
, "si_sigval", sigval_type
);
109 append_composite_type_field (sifields_type
, "_rt", type
);
112 type
= arch_composite_type (gdbarch
, NULL
, TYPE_CODE_STRUCT
);
113 append_composite_type_field (type
, "si_pid", pid_type
);
114 append_composite_type_field (type
, "si_uid", uid_type
);
115 append_composite_type_field (type
, "si_status", int_type
);
116 append_composite_type_field (type
, "si_utime", clock_type
);
117 append_composite_type_field (type
, "si_stime", clock_type
);
118 append_composite_type_field (sifields_type
, "_sigchld", type
);
121 type
= arch_composite_type (gdbarch
, NULL
, TYPE_CODE_STRUCT
);
122 append_composite_type_field (type
, "si_addr", void_ptr_type
);
123 append_composite_type_field (sifields_type
, "_sigfault", type
);
126 type
= arch_composite_type (gdbarch
, NULL
, TYPE_CODE_STRUCT
);
127 append_composite_type_field (type
, "si_band", long_type
);
128 append_composite_type_field (type
, "si_fd", int_type
);
129 append_composite_type_field (sifields_type
, "_sigpoll", type
);
132 siginfo_type
= arch_composite_type (gdbarch
, NULL
, TYPE_CODE_STRUCT
);
133 TYPE_NAME (siginfo_type
) = xstrdup ("siginfo");
134 append_composite_type_field (siginfo_type
, "si_signo", int_type
);
135 append_composite_type_field (siginfo_type
, "si_errno", int_type
);
136 append_composite_type_field (siginfo_type
, "si_code", int_type
);
137 append_composite_type_field_aligned (siginfo_type
,
138 "_sifields", sifields_type
,
139 TYPE_LENGTH (long_type
));
145 linux_has_shared_address_space (void)
147 /* Determine whether we are running on uClinux or normal Linux
150 int target_is_uclinux
;
153 = (target_auxv_search (¤t_target
, AT_NULL
, &dummy
) > 0
154 && target_auxv_search (¤t_target
, AT_PAGESZ
, &dummy
) == 0);
156 return target_is_uclinux
;
159 /* Observer for the executable_changed event, to check whether the new
160 exec binary is a PIE (Position Independent Executable) specimen, which
161 is currently unsupported. */
164 check_is_pie_binary (void)
166 Elf_Internal_Ehdr
*elf_hdr
;
170 else if (bfd_get_flavour (exec_bfd
) != bfd_target_elf_flavour
)
173 if (elf_tdata (exec_bfd
)->elf_header
->e_type
== ET_DYN
)
175 The current binary is a PIE (Position Independent Executable), which\n\
176 GDB does NOT currently support. Most debugger features will fail if used\n\
177 in this session.\n"));
180 /* Provide a prototype to silence -Wmissing-prototypes. */
181 extern initialize_file_ftype _initialize_linux_tdep
;
184 _initialize_linux_tdep (void)
186 observer_attach_executable_changed (check_is_pie_binary
);