| 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, |
| 80 | TYPE_LENGTH (int_type), "__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, |
| 86 | TYPE_LENGTH (uint_type), "__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, |
| 92 | TYPE_LENGTH (long_type), "__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 (¤t_target, AT_NULL, &dummy) > 0 |
| 178 | && target_auxv_search (¤t_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 | } |