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);