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4aa995e1 PA |
1 | /* Target-dependent code for GNU/Linux, architecture independent. |
2 | ||
4c38e0a4 | 3 | Copyright (C) 2009, 2010 Free Software Foundation, Inc. |
4aa995e1 PA |
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" | |
6b3ae818 | 21 | #include "gdbcore.h" |
4aa995e1 | 22 | #include "gdbtypes.h" |
2c0b251b | 23 | #include "linux-tdep.h" |
6b3ae818 | 24 | #include "observer.h" |
6c95b8df PA |
25 | #include "auxv.h" |
26 | #include "target.h" | |
6b3ae818 | 27 | #include "elf-bfd.h" |
6c95b8df | 28 | #include "elf/common.h" |
4aa995e1 PA |
29 | |
30 | /* This function is suitable for architectures that don't | |
31 | extend/override the standard siginfo structure. */ | |
32 | ||
33 | struct type * | |
34 | linux_get_siginfo_type (struct gdbarch *gdbarch) | |
35 | { | |
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; | |
40 | struct type *type; | |
41 | ||
e9bb382b UW |
42 | int_type = arch_integer_type (gdbarch, gdbarch_int_bit (gdbarch), |
43 | 0, "int"); | |
44 | uint_type = arch_integer_type (gdbarch, gdbarch_int_bit (gdbarch), | |
45 | 1, "unsigned int"); | |
46 | long_type = arch_integer_type (gdbarch, gdbarch_long_bit (gdbarch), | |
47 | 0, "long"); | |
4aa995e1 PA |
48 | void_ptr_type = lookup_pointer_type (builtin_type (gdbarch)->builtin_void); |
49 | ||
50 | /* sival_t */ | |
e9bb382b | 51 | sigval_type = arch_composite_type (gdbarch, NULL, TYPE_CODE_UNION); |
4aa995e1 PA |
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); | |
55 | ||
56 | /* __pid_t */ | |
e9bb382b UW |
57 | pid_type = arch_type (gdbarch, TYPE_CODE_TYPEDEF, TYPE_LENGTH (int_type), |
58 | xstrdup ("__pid_t")); | |
4aa995e1 | 59 | TYPE_TARGET_TYPE (pid_type) = int_type; |
e9bb382b | 60 | TYPE_TARGET_STUB (pid_type) = 1; |
4aa995e1 PA |
61 | |
62 | /* __uid_t */ | |
e9bb382b UW |
63 | uid_type = arch_type (gdbarch, TYPE_CODE_TYPEDEF, TYPE_LENGTH (uint_type), |
64 | xstrdup ("__uid_t")); | |
4aa995e1 | 65 | TYPE_TARGET_TYPE (uid_type) = uint_type; |
e9bb382b | 66 | TYPE_TARGET_STUB (uid_type) = 1; |
4aa995e1 PA |
67 | |
68 | /* __clock_t */ | |
e9bb382b UW |
69 | clock_type = arch_type (gdbarch, TYPE_CODE_TYPEDEF, TYPE_LENGTH (long_type), |
70 | xstrdup ("__clock_t")); | |
4aa995e1 | 71 | TYPE_TARGET_TYPE (clock_type) = long_type; |
e9bb382b | 72 | TYPE_TARGET_STUB (clock_type) = 1; |
4aa995e1 PA |
73 | |
74 | /* _sifields */ | |
e9bb382b | 75 | sifields_type = arch_composite_type (gdbarch, NULL, TYPE_CODE_UNION); |
4aa995e1 PA |
76 | |
77 | { | |
78 | const int si_max_size = 128; | |
79 | int si_pad_size; | |
80 | int size_of_int = gdbarch_int_bit (gdbarch) / HOST_CHAR_BIT; | |
81 | ||
82 | /* _pad */ | |
83 | if (gdbarch_ptr_bit (gdbarch) == 64) | |
84 | si_pad_size = (si_max_size / size_of_int) - 4; | |
85 | else | |
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)); | |
89 | } | |
90 | ||
91 | /* _kill */ | |
e9bb382b | 92 | type = arch_composite_type (gdbarch, NULL, TYPE_CODE_STRUCT); |
4aa995e1 PA |
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); | |
96 | ||
97 | /* _timer */ | |
e9bb382b | 98 | type = arch_composite_type (gdbarch, NULL, TYPE_CODE_STRUCT); |
4aa995e1 PA |
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); | |
103 | ||
104 | /* _rt */ | |
e9bb382b | 105 | type = arch_composite_type (gdbarch, NULL, TYPE_CODE_STRUCT); |
4aa995e1 PA |
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); | |
110 | ||
111 | /* _sigchld */ | |
e9bb382b | 112 | type = arch_composite_type (gdbarch, NULL, TYPE_CODE_STRUCT); |
4aa995e1 PA |
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); | |
119 | ||
120 | /* _sigfault */ | |
e9bb382b | 121 | type = arch_composite_type (gdbarch, NULL, TYPE_CODE_STRUCT); |
4aa995e1 PA |
122 | append_composite_type_field (type, "si_addr", void_ptr_type); |
123 | append_composite_type_field (sifields_type, "_sigfault", type); | |
124 | ||
125 | /* _sigpoll */ | |
e9bb382b | 126 | type = arch_composite_type (gdbarch, NULL, TYPE_CODE_STRUCT); |
4aa995e1 PA |
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); | |
130 | ||
131 | /* struct siginfo */ | |
e9bb382b | 132 | siginfo_type = arch_composite_type (gdbarch, NULL, TYPE_CODE_STRUCT); |
4aa995e1 PA |
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)); | |
140 | ||
141 | return siginfo_type; | |
142 | } | |
6b3ae818 | 143 | |
6c95b8df PA |
144 | int |
145 | linux_has_shared_address_space (void) | |
146 | { | |
147 | /* Determine whether we are running on uClinux or normal Linux | |
148 | kernel. */ | |
149 | CORE_ADDR dummy; | |
150 | int target_is_uclinux; | |
151 | ||
152 | target_is_uclinux | |
153 | = (target_auxv_search (¤t_target, AT_NULL, &dummy) > 0 | |
154 | && target_auxv_search (¤t_target, AT_PAGESZ, &dummy) == 0); | |
155 | ||
156 | return target_is_uclinux; | |
157 | } | |
158 | ||
6b3ae818 TJB |
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. */ | |
162 | ||
163 | static void | |
164 | check_is_pie_binary (void) | |
165 | { | |
166 | Elf_Internal_Ehdr *elf_hdr; | |
167 | ||
168 | if (!exec_bfd) | |
169 | return; | |
170 | else if (bfd_get_flavour (exec_bfd) != bfd_target_elf_flavour) | |
171 | return; | |
172 | ||
173 | if (elf_tdata (exec_bfd)->elf_header->e_type == ET_DYN) | |
174 | warning (_("\ | |
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")); | |
178 | } | |
179 | ||
6c95b8df PA |
180 | /* Provide a prototype to silence -Wmissing-prototypes. */ |
181 | extern initialize_file_ftype _initialize_linux_tdep; | |
182 | ||
6b3ae818 TJB |
183 | void |
184 | _initialize_linux_tdep (void) | |
185 | { | |
186 | observer_attach_executable_changed (check_is_pie_binary); | |
187 | } |