| 1 | /* Target-dependent code for FreeBSD, architecture-independent. |
| 2 | |
| 3 | Copyright (C) 2002-2016 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 "gdbcore.h" |
| 22 | #include "inferior.h" |
| 23 | #include "regcache.h" |
| 24 | #include "regset.h" |
| 25 | #include "gdbthread.h" |
| 26 | |
| 27 | #include "elf-bfd.h" |
| 28 | #include "fbsd-tdep.h" |
| 29 | |
| 30 | |
| 31 | /* This is how we want PTIDs from core files to be printed. */ |
| 32 | |
| 33 | static char * |
| 34 | fbsd_core_pid_to_str (struct gdbarch *gdbarch, ptid_t ptid) |
| 35 | { |
| 36 | static char buf[80]; |
| 37 | |
| 38 | if (ptid_get_lwp (ptid) != 0) |
| 39 | { |
| 40 | xsnprintf (buf, sizeof buf, "LWP %ld", ptid_get_lwp (ptid)); |
| 41 | return buf; |
| 42 | } |
| 43 | |
| 44 | return normal_pid_to_str (ptid); |
| 45 | } |
| 46 | |
| 47 | /* Extract the name assigned to a thread from a core. Returns the |
| 48 | string in a static buffer. */ |
| 49 | |
| 50 | static const char * |
| 51 | fbsd_core_thread_name (struct gdbarch *gdbarch, struct thread_info *thr) |
| 52 | { |
| 53 | static char buf[80]; |
| 54 | struct bfd_section *section; |
| 55 | bfd_size_type size; |
| 56 | char sectionstr[32]; |
| 57 | |
| 58 | if (ptid_get_lwp (thr->ptid) != 0) |
| 59 | { |
| 60 | /* FreeBSD includes a NT_FREEBSD_THRMISC note for each thread |
| 61 | whose contents are defined by a "struct thrmisc" declared in |
| 62 | <sys/procfs.h> on FreeBSD. The per-thread name is stored as |
| 63 | a null-terminated string as the first member of the |
| 64 | structure. Rather than define the full structure here, just |
| 65 | extract the null-terminated name from the start of the |
| 66 | note. */ |
| 67 | xsnprintf (sectionstr, sizeof sectionstr, ".thrmisc/%ld", |
| 68 | ptid_get_lwp (thr->ptid)); |
| 69 | section = bfd_get_section_by_name (core_bfd, sectionstr); |
| 70 | if (section != NULL && bfd_section_size (core_bfd, section) > 0) |
| 71 | { |
| 72 | /* Truncate the name if it is longer than "buf". */ |
| 73 | size = bfd_section_size (core_bfd, section); |
| 74 | if (size > sizeof buf - 1) |
| 75 | size = sizeof buf - 1; |
| 76 | if (bfd_get_section_contents (core_bfd, section, buf, (file_ptr) 0, |
| 77 | size) |
| 78 | && buf[0] != '\0') |
| 79 | { |
| 80 | buf[size] = '\0'; |
| 81 | |
| 82 | /* Note that each thread will report the process command |
| 83 | as its thread name instead of an empty name if a name |
| 84 | has not been set explicitly. Return a NULL name in |
| 85 | that case. */ |
| 86 | if (strcmp (buf, elf_tdata (core_bfd)->core->program) != 0) |
| 87 | return buf; |
| 88 | } |
| 89 | } |
| 90 | } |
| 91 | |
| 92 | return NULL; |
| 93 | } |
| 94 | |
| 95 | static int |
| 96 | find_signalled_thread (struct thread_info *info, void *data) |
| 97 | { |
| 98 | if (info->suspend.stop_signal != GDB_SIGNAL_0 |
| 99 | && ptid_get_pid (info->ptid) == ptid_get_pid (inferior_ptid)) |
| 100 | return 1; |
| 101 | |
| 102 | return 0; |
| 103 | } |
| 104 | |
| 105 | /* Structure for passing information from |
| 106 | fbsd_collect_thread_registers via an iterator to |
| 107 | fbsd_collect_regset_section_cb. */ |
| 108 | |
| 109 | struct fbsd_collect_regset_section_cb_data |
| 110 | { |
| 111 | const struct regcache *regcache; |
| 112 | bfd *obfd; |
| 113 | char *note_data; |
| 114 | int *note_size; |
| 115 | unsigned long lwp; |
| 116 | enum gdb_signal stop_signal; |
| 117 | int abort_iteration; |
| 118 | }; |
| 119 | |
| 120 | static void |
| 121 | fbsd_collect_regset_section_cb (const char *sect_name, int size, |
| 122 | const struct regset *regset, |
| 123 | const char *human_name, void *cb_data) |
| 124 | { |
| 125 | char *buf; |
| 126 | struct fbsd_collect_regset_section_cb_data *data |
| 127 | = (struct fbsd_collect_regset_section_cb_data *) cb_data; |
| 128 | |
| 129 | if (data->abort_iteration) |
| 130 | return; |
| 131 | |
| 132 | gdb_assert (regset->collect_regset); |
| 133 | |
| 134 | buf = (char *) xmalloc (size); |
| 135 | regset->collect_regset (regset, data->regcache, -1, buf, size); |
| 136 | |
| 137 | /* PRSTATUS still needs to be treated specially. */ |
| 138 | if (strcmp (sect_name, ".reg") == 0) |
| 139 | data->note_data = (char *) elfcore_write_prstatus |
| 140 | (data->obfd, data->note_data, data->note_size, data->lwp, |
| 141 | gdb_signal_to_host (data->stop_signal), buf); |
| 142 | else |
| 143 | data->note_data = (char *) elfcore_write_register_note |
| 144 | (data->obfd, data->note_data, data->note_size, |
| 145 | sect_name, buf, size); |
| 146 | xfree (buf); |
| 147 | |
| 148 | if (data->note_data == NULL) |
| 149 | data->abort_iteration = 1; |
| 150 | } |
| 151 | |
| 152 | /* Records the thread's register state for the corefile note |
| 153 | section. */ |
| 154 | |
| 155 | static char * |
| 156 | fbsd_collect_thread_registers (const struct regcache *regcache, |
| 157 | ptid_t ptid, bfd *obfd, |
| 158 | char *note_data, int *note_size, |
| 159 | enum gdb_signal stop_signal) |
| 160 | { |
| 161 | struct gdbarch *gdbarch = get_regcache_arch (regcache); |
| 162 | struct fbsd_collect_regset_section_cb_data data; |
| 163 | |
| 164 | data.regcache = regcache; |
| 165 | data.obfd = obfd; |
| 166 | data.note_data = note_data; |
| 167 | data.note_size = note_size; |
| 168 | data.stop_signal = stop_signal; |
| 169 | data.abort_iteration = 0; |
| 170 | data.lwp = ptid_get_lwp (ptid); |
| 171 | |
| 172 | gdbarch_iterate_over_regset_sections (gdbarch, |
| 173 | fbsd_collect_regset_section_cb, |
| 174 | &data, regcache); |
| 175 | return data.note_data; |
| 176 | } |
| 177 | |
| 178 | struct fbsd_corefile_thread_data |
| 179 | { |
| 180 | struct gdbarch *gdbarch; |
| 181 | bfd *obfd; |
| 182 | char *note_data; |
| 183 | int *note_size; |
| 184 | enum gdb_signal stop_signal; |
| 185 | }; |
| 186 | |
| 187 | /* Records the thread's register state for the corefile note |
| 188 | section. */ |
| 189 | |
| 190 | static void |
| 191 | fbsd_corefile_thread (struct thread_info *info, |
| 192 | struct fbsd_corefile_thread_data *args) |
| 193 | { |
| 194 | struct cleanup *old_chain; |
| 195 | struct regcache *regcache; |
| 196 | |
| 197 | regcache = get_thread_arch_regcache (info->ptid, args->gdbarch); |
| 198 | |
| 199 | old_chain = save_inferior_ptid (); |
| 200 | inferior_ptid = info->ptid; |
| 201 | target_fetch_registers (regcache, -1); |
| 202 | do_cleanups (old_chain); |
| 203 | |
| 204 | args->note_data = fbsd_collect_thread_registers |
| 205 | (regcache, info->ptid, args->obfd, args->note_data, |
| 206 | args->note_size, args->stop_signal); |
| 207 | } |
| 208 | |
| 209 | /* Create appropriate note sections for a corefile, returning them in |
| 210 | allocated memory. */ |
| 211 | |
| 212 | static char * |
| 213 | fbsd_make_corefile_notes (struct gdbarch *gdbarch, bfd *obfd, int *note_size) |
| 214 | { |
| 215 | struct fbsd_corefile_thread_data thread_args; |
| 216 | char *note_data = NULL; |
| 217 | Elf_Internal_Ehdr *i_ehdrp; |
| 218 | struct thread_info *curr_thr, *signalled_thr, *thr; |
| 219 | |
| 220 | /* Put a "FreeBSD" label in the ELF header. */ |
| 221 | i_ehdrp = elf_elfheader (obfd); |
| 222 | i_ehdrp->e_ident[EI_OSABI] = ELFOSABI_FREEBSD; |
| 223 | |
| 224 | gdb_assert (gdbarch_iterate_over_regset_sections_p (gdbarch)); |
| 225 | |
| 226 | if (get_exec_file (0)) |
| 227 | { |
| 228 | const char *fname = lbasename (get_exec_file (0)); |
| 229 | char *psargs = xstrdup (fname); |
| 230 | |
| 231 | if (get_inferior_args ()) |
| 232 | psargs = reconcat (psargs, psargs, " ", get_inferior_args (), |
| 233 | (char *) NULL); |
| 234 | |
| 235 | note_data = elfcore_write_prpsinfo (obfd, note_data, note_size, |
| 236 | fname, psargs); |
| 237 | } |
| 238 | |
| 239 | /* Thread register information. */ |
| 240 | TRY |
| 241 | { |
| 242 | update_thread_list (); |
| 243 | } |
| 244 | CATCH (e, RETURN_MASK_ERROR) |
| 245 | { |
| 246 | exception_print (gdb_stderr, e); |
| 247 | } |
| 248 | END_CATCH |
| 249 | |
| 250 | /* Like the kernel, prefer dumping the signalled thread first. |
| 251 | "First thread" is what tools use to infer the signalled thread. |
| 252 | In case there's more than one signalled thread, prefer the |
| 253 | current thread, if it is signalled. */ |
| 254 | curr_thr = inferior_thread (); |
| 255 | if (curr_thr->suspend.stop_signal != GDB_SIGNAL_0) |
| 256 | signalled_thr = curr_thr; |
| 257 | else |
| 258 | { |
| 259 | signalled_thr = iterate_over_threads (find_signalled_thread, NULL); |
| 260 | if (signalled_thr == NULL) |
| 261 | signalled_thr = curr_thr; |
| 262 | } |
| 263 | |
| 264 | thread_args.gdbarch = gdbarch; |
| 265 | thread_args.obfd = obfd; |
| 266 | thread_args.note_data = note_data; |
| 267 | thread_args.note_size = note_size; |
| 268 | thread_args.stop_signal = signalled_thr->suspend.stop_signal; |
| 269 | |
| 270 | fbsd_corefile_thread (signalled_thr, &thread_args); |
| 271 | ALL_NON_EXITED_THREADS (thr) |
| 272 | { |
| 273 | if (thr == signalled_thr) |
| 274 | continue; |
| 275 | if (ptid_get_pid (thr->ptid) != ptid_get_pid (inferior_ptid)) |
| 276 | continue; |
| 277 | |
| 278 | fbsd_corefile_thread (thr, &thread_args); |
| 279 | } |
| 280 | |
| 281 | note_data = thread_args.note_data; |
| 282 | |
| 283 | return note_data; |
| 284 | } |
| 285 | |
| 286 | /* To be called from GDB_OSABI_FREEBSD_ELF handlers. */ |
| 287 | |
| 288 | void |
| 289 | fbsd_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch) |
| 290 | { |
| 291 | set_gdbarch_core_pid_to_str (gdbarch, fbsd_core_pid_to_str); |
| 292 | set_gdbarch_core_thread_name (gdbarch, fbsd_core_thread_name); |
| 293 | set_gdbarch_make_corefile_notes (gdbarch, fbsd_make_corefile_notes); |
| 294 | } |