| 1 | /* Target-dependent code for GNU/Linux, architecture independent. |
| 2 | |
| 3 | Copyright (C) 2009, 2010 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 | |
| 27 | /* This function is suitable for architectures that don't |
| 28 | extend/override the standard siginfo structure. */ |
| 29 | |
| 30 | struct type * |
| 31 | linux_get_siginfo_type (struct gdbarch *gdbarch) |
| 32 | { |
| 33 | struct type *int_type, *uint_type, *long_type, *void_ptr_type; |
| 34 | struct type *uid_type, *pid_type; |
| 35 | struct type *sigval_type, *clock_type; |
| 36 | struct type *siginfo_type, *sifields_type; |
| 37 | struct type *type; |
| 38 | |
| 39 | int_type = arch_integer_type (gdbarch, gdbarch_int_bit (gdbarch), |
| 40 | 0, "int"); |
| 41 | uint_type = arch_integer_type (gdbarch, gdbarch_int_bit (gdbarch), |
| 42 | 1, "unsigned int"); |
| 43 | long_type = arch_integer_type (gdbarch, gdbarch_long_bit (gdbarch), |
| 44 | 0, "long"); |
| 45 | void_ptr_type = lookup_pointer_type (builtin_type (gdbarch)->builtin_void); |
| 46 | |
| 47 | /* sival_t */ |
| 48 | sigval_type = arch_composite_type (gdbarch, NULL, TYPE_CODE_UNION); |
| 49 | TYPE_NAME (sigval_type) = xstrdup ("sigval_t"); |
| 50 | append_composite_type_field (sigval_type, "sival_int", int_type); |
| 51 | append_composite_type_field (sigval_type, "sival_ptr", void_ptr_type); |
| 52 | |
| 53 | /* __pid_t */ |
| 54 | pid_type = arch_type (gdbarch, TYPE_CODE_TYPEDEF, TYPE_LENGTH (int_type), |
| 55 | xstrdup ("__pid_t")); |
| 56 | TYPE_TARGET_TYPE (pid_type) = int_type; |
| 57 | TYPE_TARGET_STUB (pid_type) = 1; |
| 58 | |
| 59 | /* __uid_t */ |
| 60 | uid_type = arch_type (gdbarch, TYPE_CODE_TYPEDEF, TYPE_LENGTH (uint_type), |
| 61 | xstrdup ("__uid_t")); |
| 62 | TYPE_TARGET_TYPE (uid_type) = uint_type; |
| 63 | TYPE_TARGET_STUB (uid_type) = 1; |
| 64 | |
| 65 | /* __clock_t */ |
| 66 | clock_type = arch_type (gdbarch, TYPE_CODE_TYPEDEF, TYPE_LENGTH (long_type), |
| 67 | xstrdup ("__clock_t")); |
| 68 | TYPE_TARGET_TYPE (clock_type) = long_type; |
| 69 | TYPE_TARGET_STUB (clock_type) = 1; |
| 70 | |
| 71 | /* _sifields */ |
| 72 | sifields_type = arch_composite_type (gdbarch, NULL, TYPE_CODE_UNION); |
| 73 | |
| 74 | { |
| 75 | const int si_max_size = 128; |
| 76 | int si_pad_size; |
| 77 | int size_of_int = gdbarch_int_bit (gdbarch) / HOST_CHAR_BIT; |
| 78 | |
| 79 | /* _pad */ |
| 80 | if (gdbarch_ptr_bit (gdbarch) == 64) |
| 81 | si_pad_size = (si_max_size / size_of_int) - 4; |
| 82 | else |
| 83 | si_pad_size = (si_max_size / size_of_int) - 3; |
| 84 | append_composite_type_field (sifields_type, "_pad", |
| 85 | init_vector_type (int_type, si_pad_size)); |
| 86 | } |
| 87 | |
| 88 | /* _kill */ |
| 89 | type = arch_composite_type (gdbarch, NULL, TYPE_CODE_STRUCT); |
| 90 | append_composite_type_field (type, "si_pid", pid_type); |
| 91 | append_composite_type_field (type, "si_uid", uid_type); |
| 92 | append_composite_type_field (sifields_type, "_kill", type); |
| 93 | |
| 94 | /* _timer */ |
| 95 | type = arch_composite_type (gdbarch, NULL, TYPE_CODE_STRUCT); |
| 96 | append_composite_type_field (type, "si_tid", int_type); |
| 97 | append_composite_type_field (type, "si_overrun", int_type); |
| 98 | append_composite_type_field (type, "si_sigval", sigval_type); |
| 99 | append_composite_type_field (sifields_type, "_timer", type); |
| 100 | |
| 101 | /* _rt */ |
| 102 | type = arch_composite_type (gdbarch, NULL, TYPE_CODE_STRUCT); |
| 103 | append_composite_type_field (type, "si_pid", pid_type); |
| 104 | append_composite_type_field (type, "si_uid", uid_type); |
| 105 | append_composite_type_field (type, "si_sigval", sigval_type); |
| 106 | append_composite_type_field (sifields_type, "_rt", type); |
| 107 | |
| 108 | /* _sigchld */ |
| 109 | type = arch_composite_type (gdbarch, NULL, TYPE_CODE_STRUCT); |
| 110 | append_composite_type_field (type, "si_pid", pid_type); |
| 111 | append_composite_type_field (type, "si_uid", uid_type); |
| 112 | append_composite_type_field (type, "si_status", int_type); |
| 113 | append_composite_type_field (type, "si_utime", clock_type); |
| 114 | append_composite_type_field (type, "si_stime", clock_type); |
| 115 | append_composite_type_field (sifields_type, "_sigchld", type); |
| 116 | |
| 117 | /* _sigfault */ |
| 118 | type = arch_composite_type (gdbarch, NULL, TYPE_CODE_STRUCT); |
| 119 | append_composite_type_field (type, "si_addr", void_ptr_type); |
| 120 | append_composite_type_field (sifields_type, "_sigfault", type); |
| 121 | |
| 122 | /* _sigpoll */ |
| 123 | type = arch_composite_type (gdbarch, NULL, TYPE_CODE_STRUCT); |
| 124 | append_composite_type_field (type, "si_band", long_type); |
| 125 | append_composite_type_field (type, "si_fd", int_type); |
| 126 | append_composite_type_field (sifields_type, "_sigpoll", type); |
| 127 | |
| 128 | /* struct siginfo */ |
| 129 | siginfo_type = arch_composite_type (gdbarch, NULL, TYPE_CODE_STRUCT); |
| 130 | TYPE_NAME (siginfo_type) = xstrdup ("siginfo"); |
| 131 | append_composite_type_field (siginfo_type, "si_signo", int_type); |
| 132 | append_composite_type_field (siginfo_type, "si_errno", int_type); |
| 133 | append_composite_type_field (siginfo_type, "si_code", int_type); |
| 134 | append_composite_type_field_aligned (siginfo_type, |
| 135 | "_sifields", sifields_type, |
| 136 | TYPE_LENGTH (long_type)); |
| 137 | |
| 138 | return siginfo_type; |
| 139 | } |
| 140 | |
| 141 | int |
| 142 | linux_has_shared_address_space (void) |
| 143 | { |
| 144 | /* Determine whether we are running on uClinux or normal Linux |
| 145 | kernel. */ |
| 146 | CORE_ADDR dummy; |
| 147 | int target_is_uclinux; |
| 148 | |
| 149 | target_is_uclinux |
| 150 | = (target_auxv_search (¤t_target, AT_NULL, &dummy) > 0 |
| 151 | && target_auxv_search (¤t_target, AT_PAGESZ, &dummy) == 0); |
| 152 | |
| 153 | return target_is_uclinux; |
| 154 | } |