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4aa995e1 PA |
1 | /* Target-dependent code for GNU/Linux, architecture independent. |
2 | ||
3666a048 | 3 | Copyright (C) 2009-2021 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" | |
21 | #include "gdbtypes.h" | |
2c0b251b | 22 | #include "linux-tdep.h" |
6c95b8df PA |
23 | #include "auxv.h" |
24 | #include "target.h" | |
6432734d UW |
25 | #include "gdbthread.h" |
26 | #include "gdbcore.h" | |
27 | #include "regcache.h" | |
28 | #include "regset.h" | |
6c95b8df | 29 | #include "elf/common.h" |
6432734d | 30 | #include "elf-bfd.h" /* for elfcore_write_* */ |
a5ee0f0c | 31 | #include "inferior.h" |
3030c96e | 32 | #include "cli/cli-utils.h" |
451b7c33 TT |
33 | #include "arch-utils.h" |
34 | #include "gdb_obstack.h" | |
76727919 | 35 | #include "observable.h" |
3bc3cebe JK |
36 | #include "objfiles.h" |
37 | #include "infcall.h" | |
df8411da | 38 | #include "gdbcmd.h" |
db1ff28b | 39 | #include "gdb_regex.h" |
268a13a5 TT |
40 | #include "gdbsupport/enum-flags.h" |
41 | #include "gdbsupport/gdb_optional.h" | |
f3a5df7b AB |
42 | #include "gcore.h" |
43 | #include "gcore-elf.h" | |
3030c96e UW |
44 | |
45 | #include <ctype.h> | |
4aa995e1 | 46 | |
db1ff28b JK |
47 | /* This enum represents the values that the user can choose when |
48 | informing the Linux kernel about which memory mappings will be | |
49 | dumped in a corefile. They are described in the file | |
50 | Documentation/filesystems/proc.txt, inside the Linux kernel | |
51 | tree. */ | |
52 | ||
8d297bbf | 53 | enum filter_flag |
db1ff28b JK |
54 | { |
55 | COREFILTER_ANON_PRIVATE = 1 << 0, | |
56 | COREFILTER_ANON_SHARED = 1 << 1, | |
57 | COREFILTER_MAPPED_PRIVATE = 1 << 2, | |
58 | COREFILTER_MAPPED_SHARED = 1 << 3, | |
59 | COREFILTER_ELF_HEADERS = 1 << 4, | |
60 | COREFILTER_HUGETLB_PRIVATE = 1 << 5, | |
61 | COREFILTER_HUGETLB_SHARED = 1 << 6, | |
62 | }; | |
8d297bbf | 63 | DEF_ENUM_FLAGS_TYPE (enum filter_flag, filter_flags); |
db1ff28b JK |
64 | |
65 | /* This struct is used to map flags found in the "VmFlags:" field (in | |
66 | the /proc/<PID>/smaps file). */ | |
67 | ||
68 | struct smaps_vmflags | |
69 | { | |
70 | /* Zero if this structure has not been initialized yet. It | |
71 | probably means that the Linux kernel being used does not emit | |
72 | the "VmFlags:" field on "/proc/PID/smaps". */ | |
73 | ||
74 | unsigned int initialized_p : 1; | |
75 | ||
76 | /* Memory mapped I/O area (VM_IO, "io"). */ | |
77 | ||
78 | unsigned int io_page : 1; | |
79 | ||
80 | /* Area uses huge TLB pages (VM_HUGETLB, "ht"). */ | |
81 | ||
82 | unsigned int uses_huge_tlb : 1; | |
83 | ||
84 | /* Do not include this memory region on the coredump (VM_DONTDUMP, "dd"). */ | |
85 | ||
86 | unsigned int exclude_coredump : 1; | |
87 | ||
88 | /* Is this a MAP_SHARED mapping (VM_SHARED, "sh"). */ | |
89 | ||
90 | unsigned int shared_mapping : 1; | |
1e735120 LM |
91 | |
92 | /* Memory map has memory tagging enabled. */ | |
93 | ||
94 | unsigned int memory_tagging : 1; | |
db1ff28b JK |
95 | }; |
96 | ||
1e735120 LM |
97 | /* Data structure that holds the information contained in the |
98 | /proc/<pid>/smaps file. */ | |
99 | ||
100 | struct smaps_data | |
101 | { | |
102 | ULONGEST start_address; | |
103 | ULONGEST end_address; | |
104 | std::string filename; | |
105 | struct smaps_vmflags vmflags; | |
106 | bool read; | |
107 | bool write; | |
108 | bool exec; | |
109 | bool priv; | |
110 | bool has_anonymous; | |
111 | bool mapping_anon_p; | |
112 | bool mapping_file_p; | |
113 | ||
114 | ULONGEST inode; | |
115 | ULONGEST offset; | |
116 | }; | |
117 | ||
df8411da SDJ |
118 | /* Whether to take the /proc/PID/coredump_filter into account when |
119 | generating a corefile. */ | |
120 | ||
491144b5 | 121 | static bool use_coredump_filter = true; |
df8411da | 122 | |
afa840dc SL |
123 | /* Whether the value of smaps_vmflags->exclude_coredump should be |
124 | ignored, including mappings marked with the VM_DONTDUMP flag in | |
125 | the dump. */ | |
491144b5 | 126 | static bool dump_excluded_mappings = false; |
afa840dc | 127 | |
eb14d406 SDJ |
128 | /* This enum represents the signals' numbers on a generic architecture |
129 | running the Linux kernel. The definition of "generic" comes from | |
130 | the file <include/uapi/asm-generic/signal.h>, from the Linux kernel | |
131 | tree, which is the "de facto" implementation of signal numbers to | |
132 | be used by new architecture ports. | |
133 | ||
134 | For those architectures which have differences between the generic | |
135 | standard (e.g., Alpha), we define the different signals (and *only* | |
136 | those) in the specific target-dependent file (e.g., | |
137 | alpha-linux-tdep.c, for Alpha). Please refer to the architecture's | |
138 | tdep file for more information. | |
139 | ||
140 | ARM deserves a special mention here. On the file | |
141 | <arch/arm/include/uapi/asm/signal.h>, it defines only one different | |
142 | (and ARM-only) signal, which is SIGSWI, with the same number as | |
143 | SIGRTMIN. This signal is used only for a very specific target, | |
144 | called ArthurOS (from RISCOS). Therefore, we do not handle it on | |
145 | the ARM-tdep file, and we can safely use the generic signal handler | |
146 | here for ARM targets. | |
147 | ||
148 | As stated above, this enum is derived from | |
149 | <include/uapi/asm-generic/signal.h>, from the Linux kernel | |
150 | tree. */ | |
151 | ||
152 | enum | |
153 | { | |
154 | LINUX_SIGHUP = 1, | |
155 | LINUX_SIGINT = 2, | |
156 | LINUX_SIGQUIT = 3, | |
157 | LINUX_SIGILL = 4, | |
158 | LINUX_SIGTRAP = 5, | |
159 | LINUX_SIGABRT = 6, | |
160 | LINUX_SIGIOT = 6, | |
161 | LINUX_SIGBUS = 7, | |
162 | LINUX_SIGFPE = 8, | |
163 | LINUX_SIGKILL = 9, | |
164 | LINUX_SIGUSR1 = 10, | |
165 | LINUX_SIGSEGV = 11, | |
166 | LINUX_SIGUSR2 = 12, | |
167 | LINUX_SIGPIPE = 13, | |
168 | LINUX_SIGALRM = 14, | |
169 | LINUX_SIGTERM = 15, | |
170 | LINUX_SIGSTKFLT = 16, | |
171 | LINUX_SIGCHLD = 17, | |
172 | LINUX_SIGCONT = 18, | |
173 | LINUX_SIGSTOP = 19, | |
174 | LINUX_SIGTSTP = 20, | |
175 | LINUX_SIGTTIN = 21, | |
176 | LINUX_SIGTTOU = 22, | |
177 | LINUX_SIGURG = 23, | |
178 | LINUX_SIGXCPU = 24, | |
179 | LINUX_SIGXFSZ = 25, | |
180 | LINUX_SIGVTALRM = 26, | |
181 | LINUX_SIGPROF = 27, | |
182 | LINUX_SIGWINCH = 28, | |
183 | LINUX_SIGIO = 29, | |
184 | LINUX_SIGPOLL = LINUX_SIGIO, | |
185 | LINUX_SIGPWR = 30, | |
186 | LINUX_SIGSYS = 31, | |
187 | LINUX_SIGUNUSED = 31, | |
188 | ||
189 | LINUX_SIGRTMIN = 32, | |
190 | LINUX_SIGRTMAX = 64, | |
191 | }; | |
192 | ||
06253dd3 JK |
193 | static struct gdbarch_data *linux_gdbarch_data_handle; |
194 | ||
195 | struct linux_gdbarch_data | |
480af54c SM |
196 | { |
197 | struct type *siginfo_type; | |
198 | int num_disp_step_buffers; | |
199 | }; | |
06253dd3 JK |
200 | |
201 | static void * | |
d9655058 | 202 | init_linux_gdbarch_data (struct obstack *obstack) |
06253dd3 | 203 | { |
d9655058 | 204 | return obstack_zalloc<linux_gdbarch_data> (obstack); |
06253dd3 JK |
205 | } |
206 | ||
207 | static struct linux_gdbarch_data * | |
208 | get_linux_gdbarch_data (struct gdbarch *gdbarch) | |
209 | { | |
9a3c8263 SM |
210 | return ((struct linux_gdbarch_data *) |
211 | gdbarch_data (gdbarch, linux_gdbarch_data_handle)); | |
06253dd3 JK |
212 | } |
213 | ||
cdfa0b0a PA |
214 | /* Linux-specific cached data. This is used by GDB for caching |
215 | purposes for each inferior. This helps reduce the overhead of | |
216 | transfering data from a remote target to the local host. */ | |
217 | struct linux_info | |
218 | { | |
219 | /* Cache of the inferior's vsyscall/vDSO mapping range. Only valid | |
220 | if VSYSCALL_RANGE_P is positive. This is cached because getting | |
221 | at this info requires an auxv lookup (which is itself cached), | |
222 | and looking through the inferior's mappings (which change | |
223 | throughout execution and therefore cannot be cached). */ | |
89fb8848 | 224 | struct mem_range vsyscall_range {}; |
cdfa0b0a PA |
225 | |
226 | /* Zero if we haven't tried looking up the vsyscall's range before | |
227 | yet. Positive if we tried looking it up, and found it. Negative | |
228 | if we tried looking it up but failed. */ | |
89fb8848 | 229 | int vsyscall_range_p = 0; |
187b041e | 230 | |
480af54c SM |
231 | /* Inferior's displaced step buffers. */ |
232 | gdb::optional<displaced_step_buffers> disp_step_bufs; | |
cdfa0b0a PA |
233 | }; |
234 | ||
89fb8848 TT |
235 | /* Per-inferior data key. */ |
236 | static const struct inferior_key<linux_info> linux_inferior_data; | |
237 | ||
cdfa0b0a PA |
238 | /* Frees whatever allocated space there is to be freed and sets INF's |
239 | linux cache data pointer to NULL. */ | |
240 | ||
241 | static void | |
242 | invalidate_linux_cache_inf (struct inferior *inf) | |
243 | { | |
89fb8848 | 244 | linux_inferior_data.clear (inf); |
cdfa0b0a PA |
245 | } |
246 | ||
247 | /* Fetch the linux cache info for INF. This function always returns a | |
248 | valid INFO pointer. */ | |
249 | ||
250 | static struct linux_info * | |
94b24c74 | 251 | get_linux_inferior_data (inferior *inf) |
cdfa0b0a | 252 | { |
94b24c74 | 253 | linux_info *info = linux_inferior_data.get (inf); |
cdfa0b0a | 254 | |
94b24c74 | 255 | if (info == nullptr) |
89fb8848 | 256 | info = linux_inferior_data.emplace (inf); |
cdfa0b0a PA |
257 | |
258 | return info; | |
259 | } | |
260 | ||
190b495d | 261 | /* See linux-tdep.h. */ |
4aa995e1 | 262 | |
190b495d | 263 | struct type * |
43564574 WT |
264 | linux_get_siginfo_type_with_fields (struct gdbarch *gdbarch, |
265 | linux_siginfo_extra_fields extra_fields) | |
4aa995e1 | 266 | { |
06253dd3 | 267 | struct linux_gdbarch_data *linux_gdbarch_data; |
96b5c49f | 268 | struct type *int_type, *uint_type, *long_type, *void_ptr_type, *short_type; |
4aa995e1 PA |
269 | struct type *uid_type, *pid_type; |
270 | struct type *sigval_type, *clock_type; | |
271 | struct type *siginfo_type, *sifields_type; | |
272 | struct type *type; | |
273 | ||
06253dd3 JK |
274 | linux_gdbarch_data = get_linux_gdbarch_data (gdbarch); |
275 | if (linux_gdbarch_data->siginfo_type != NULL) | |
276 | return linux_gdbarch_data->siginfo_type; | |
277 | ||
e9bb382b UW |
278 | int_type = arch_integer_type (gdbarch, gdbarch_int_bit (gdbarch), |
279 | 0, "int"); | |
280 | uint_type = arch_integer_type (gdbarch, gdbarch_int_bit (gdbarch), | |
281 | 1, "unsigned int"); | |
282 | long_type = arch_integer_type (gdbarch, gdbarch_long_bit (gdbarch), | |
283 | 0, "long"); | |
96b5c49f WT |
284 | short_type = arch_integer_type (gdbarch, gdbarch_long_bit (gdbarch), |
285 | 0, "short"); | |
4aa995e1 PA |
286 | void_ptr_type = lookup_pointer_type (builtin_type (gdbarch)->builtin_void); |
287 | ||
288 | /* sival_t */ | |
e9bb382b | 289 | sigval_type = arch_composite_type (gdbarch, NULL, TYPE_CODE_UNION); |
d0e39ea2 | 290 | sigval_type->set_name (xstrdup ("sigval_t")); |
4aa995e1 PA |
291 | append_composite_type_field (sigval_type, "sival_int", int_type); |
292 | append_composite_type_field (sigval_type, "sival_ptr", void_ptr_type); | |
293 | ||
294 | /* __pid_t */ | |
e3aa49af | 295 | pid_type = arch_type (gdbarch, TYPE_CODE_TYPEDEF, |
77b7c781 | 296 | TYPE_LENGTH (int_type) * TARGET_CHAR_BIT, "__pid_t"); |
4aa995e1 | 297 | TYPE_TARGET_TYPE (pid_type) = int_type; |
8f53807e | 298 | pid_type->set_target_is_stub (true); |
4aa995e1 PA |
299 | |
300 | /* __uid_t */ | |
e3aa49af | 301 | uid_type = arch_type (gdbarch, TYPE_CODE_TYPEDEF, |
77b7c781 | 302 | TYPE_LENGTH (uint_type) * TARGET_CHAR_BIT, "__uid_t"); |
4aa995e1 | 303 | TYPE_TARGET_TYPE (uid_type) = uint_type; |
8f53807e | 304 | uid_type->set_target_is_stub (true); |
4aa995e1 PA |
305 | |
306 | /* __clock_t */ | |
e3aa49af | 307 | clock_type = arch_type (gdbarch, TYPE_CODE_TYPEDEF, |
77b7c781 UW |
308 | TYPE_LENGTH (long_type) * TARGET_CHAR_BIT, |
309 | "__clock_t"); | |
4aa995e1 | 310 | TYPE_TARGET_TYPE (clock_type) = long_type; |
8f53807e | 311 | clock_type->set_target_is_stub (true); |
4aa995e1 PA |
312 | |
313 | /* _sifields */ | |
e9bb382b | 314 | sifields_type = arch_composite_type (gdbarch, NULL, TYPE_CODE_UNION); |
4aa995e1 PA |
315 | |
316 | { | |
317 | const int si_max_size = 128; | |
318 | int si_pad_size; | |
319 | int size_of_int = gdbarch_int_bit (gdbarch) / HOST_CHAR_BIT; | |
320 | ||
321 | /* _pad */ | |
322 | if (gdbarch_ptr_bit (gdbarch) == 64) | |
323 | si_pad_size = (si_max_size / size_of_int) - 4; | |
324 | else | |
325 | si_pad_size = (si_max_size / size_of_int) - 3; | |
326 | append_composite_type_field (sifields_type, "_pad", | |
327 | init_vector_type (int_type, si_pad_size)); | |
328 | } | |
329 | ||
330 | /* _kill */ | |
e9bb382b | 331 | type = arch_composite_type (gdbarch, NULL, TYPE_CODE_STRUCT); |
4aa995e1 PA |
332 | append_composite_type_field (type, "si_pid", pid_type); |
333 | append_composite_type_field (type, "si_uid", uid_type); | |
334 | append_composite_type_field (sifields_type, "_kill", type); | |
335 | ||
336 | /* _timer */ | |
e9bb382b | 337 | type = arch_composite_type (gdbarch, NULL, TYPE_CODE_STRUCT); |
4aa995e1 PA |
338 | append_composite_type_field (type, "si_tid", int_type); |
339 | append_composite_type_field (type, "si_overrun", int_type); | |
340 | append_composite_type_field (type, "si_sigval", sigval_type); | |
341 | append_composite_type_field (sifields_type, "_timer", type); | |
342 | ||
343 | /* _rt */ | |
e9bb382b | 344 | type = arch_composite_type (gdbarch, NULL, TYPE_CODE_STRUCT); |
4aa995e1 PA |
345 | append_composite_type_field (type, "si_pid", pid_type); |
346 | append_composite_type_field (type, "si_uid", uid_type); | |
347 | append_composite_type_field (type, "si_sigval", sigval_type); | |
348 | append_composite_type_field (sifields_type, "_rt", type); | |
349 | ||
350 | /* _sigchld */ | |
e9bb382b | 351 | type = arch_composite_type (gdbarch, NULL, TYPE_CODE_STRUCT); |
4aa995e1 PA |
352 | append_composite_type_field (type, "si_pid", pid_type); |
353 | append_composite_type_field (type, "si_uid", uid_type); | |
354 | append_composite_type_field (type, "si_status", int_type); | |
355 | append_composite_type_field (type, "si_utime", clock_type); | |
356 | append_composite_type_field (type, "si_stime", clock_type); | |
357 | append_composite_type_field (sifields_type, "_sigchld", type); | |
358 | ||
359 | /* _sigfault */ | |
e9bb382b | 360 | type = arch_composite_type (gdbarch, NULL, TYPE_CODE_STRUCT); |
4aa995e1 | 361 | append_composite_type_field (type, "si_addr", void_ptr_type); |
96b5c49f WT |
362 | |
363 | /* Additional bound fields for _sigfault in case they were requested. */ | |
364 | if ((extra_fields & LINUX_SIGINFO_FIELD_ADDR_BND) != 0) | |
365 | { | |
366 | struct type *sigfault_bnd_fields; | |
367 | ||
368 | append_composite_type_field (type, "_addr_lsb", short_type); | |
369 | sigfault_bnd_fields = arch_composite_type (gdbarch, NULL, TYPE_CODE_STRUCT); | |
370 | append_composite_type_field (sigfault_bnd_fields, "_lower", void_ptr_type); | |
371 | append_composite_type_field (sigfault_bnd_fields, "_upper", void_ptr_type); | |
372 | append_composite_type_field (type, "_addr_bnd", sigfault_bnd_fields); | |
373 | } | |
4aa995e1 PA |
374 | append_composite_type_field (sifields_type, "_sigfault", type); |
375 | ||
376 | /* _sigpoll */ | |
e9bb382b | 377 | type = arch_composite_type (gdbarch, NULL, TYPE_CODE_STRUCT); |
4aa995e1 PA |
378 | append_composite_type_field (type, "si_band", long_type); |
379 | append_composite_type_field (type, "si_fd", int_type); | |
380 | append_composite_type_field (sifields_type, "_sigpoll", type); | |
381 | ||
382 | /* struct siginfo */ | |
e9bb382b | 383 | siginfo_type = arch_composite_type (gdbarch, NULL, TYPE_CODE_STRUCT); |
d0e39ea2 | 384 | siginfo_type->set_name (xstrdup ("siginfo")); |
4aa995e1 PA |
385 | append_composite_type_field (siginfo_type, "si_signo", int_type); |
386 | append_composite_type_field (siginfo_type, "si_errno", int_type); | |
387 | append_composite_type_field (siginfo_type, "si_code", int_type); | |
388 | append_composite_type_field_aligned (siginfo_type, | |
389 | "_sifields", sifields_type, | |
390 | TYPE_LENGTH (long_type)); | |
391 | ||
06253dd3 JK |
392 | linux_gdbarch_data->siginfo_type = siginfo_type; |
393 | ||
4aa995e1 PA |
394 | return siginfo_type; |
395 | } | |
6b3ae818 | 396 | |
43564574 WT |
397 | /* This function is suitable for architectures that don't |
398 | extend/override the standard siginfo structure. */ | |
399 | ||
400 | static struct type * | |
401 | linux_get_siginfo_type (struct gdbarch *gdbarch) | |
402 | { | |
403 | return linux_get_siginfo_type_with_fields (gdbarch, 0); | |
404 | } | |
405 | ||
c01cbb3d YQ |
406 | /* Return true if the target is running on uClinux instead of normal |
407 | Linux kernel. */ | |
408 | ||
409 | int | |
410 | linux_is_uclinux (void) | |
6c95b8df | 411 | { |
6c95b8df | 412 | CORE_ADDR dummy; |
328d42d8 | 413 | target_ops *target = current_inferior ()->top_target (); |
6c95b8df | 414 | |
328d42d8 SM |
415 | return (target_auxv_search (target, AT_NULL, &dummy) > 0 |
416 | && target_auxv_search (target, AT_PAGESZ, &dummy) == 0); | |
c01cbb3d | 417 | } |
6c95b8df | 418 | |
c01cbb3d YQ |
419 | static int |
420 | linux_has_shared_address_space (struct gdbarch *gdbarch) | |
421 | { | |
422 | return linux_is_uclinux (); | |
6c95b8df | 423 | } |
a5ee0f0c PA |
424 | |
425 | /* This is how we want PTIDs from core files to be printed. */ | |
426 | ||
a068643d | 427 | static std::string |
a5ee0f0c PA |
428 | linux_core_pid_to_str (struct gdbarch *gdbarch, ptid_t ptid) |
429 | { | |
e38504b3 | 430 | if (ptid.lwp () != 0) |
a068643d | 431 | return string_printf ("LWP %ld", ptid.lwp ()); |
a5ee0f0c PA |
432 | |
433 | return normal_pid_to_str (ptid); | |
434 | } | |
435 | ||
db1ff28b JK |
436 | /* Service function for corefiles and info proc. */ |
437 | ||
438 | static void | |
439 | read_mapping (const char *line, | |
440 | ULONGEST *addr, ULONGEST *endaddr, | |
441 | const char **permissions, size_t *permissions_len, | |
442 | ULONGEST *offset, | |
dda83cd7 | 443 | const char **device, size_t *device_len, |
db1ff28b JK |
444 | ULONGEST *inode, |
445 | const char **filename) | |
446 | { | |
447 | const char *p = line; | |
448 | ||
449 | *addr = strtoulst (p, &p, 16); | |
450 | if (*p == '-') | |
451 | p++; | |
452 | *endaddr = strtoulst (p, &p, 16); | |
453 | ||
f1735a53 | 454 | p = skip_spaces (p); |
db1ff28b JK |
455 | *permissions = p; |
456 | while (*p && !isspace (*p)) | |
457 | p++; | |
458 | *permissions_len = p - *permissions; | |
459 | ||
460 | *offset = strtoulst (p, &p, 16); | |
461 | ||
f1735a53 | 462 | p = skip_spaces (p); |
db1ff28b JK |
463 | *device = p; |
464 | while (*p && !isspace (*p)) | |
465 | p++; | |
466 | *device_len = p - *device; | |
467 | ||
468 | *inode = strtoulst (p, &p, 10); | |
469 | ||
f1735a53 | 470 | p = skip_spaces (p); |
db1ff28b JK |
471 | *filename = p; |
472 | } | |
473 | ||
474 | /* Helper function to decode the "VmFlags" field in /proc/PID/smaps. | |
475 | ||
476 | This function was based on the documentation found on | |
477 | <Documentation/filesystems/proc.txt>, on the Linux kernel. | |
478 | ||
479 | Linux kernels before commit | |
480 | 834f82e2aa9a8ede94b17b656329f850c1471514 (3.10) do not have this | |
481 | field on smaps. */ | |
482 | ||
483 | static void | |
484 | decode_vmflags (char *p, struct smaps_vmflags *v) | |
485 | { | |
486 | char *saveptr = NULL; | |
487 | const char *s; | |
488 | ||
489 | v->initialized_p = 1; | |
490 | p = skip_to_space (p); | |
491 | p = skip_spaces (p); | |
492 | ||
493 | for (s = strtok_r (p, " ", &saveptr); | |
494 | s != NULL; | |
495 | s = strtok_r (NULL, " ", &saveptr)) | |
496 | { | |
497 | if (strcmp (s, "io") == 0) | |
498 | v->io_page = 1; | |
499 | else if (strcmp (s, "ht") == 0) | |
500 | v->uses_huge_tlb = 1; | |
501 | else if (strcmp (s, "dd") == 0) | |
502 | v->exclude_coredump = 1; | |
503 | else if (strcmp (s, "sh") == 0) | |
504 | v->shared_mapping = 1; | |
1e735120 LM |
505 | else if (strcmp (s, "mt") == 0) |
506 | v->memory_tagging = 1; | |
db1ff28b JK |
507 | } |
508 | } | |
509 | ||
2d7cc5c7 PA |
510 | /* Regexes used by mapping_is_anonymous_p. Put in a structure because |
511 | they're initialized lazily. */ | |
512 | ||
513 | struct mapping_regexes | |
514 | { | |
515 | /* Matches "/dev/zero" filenames (with or without the "(deleted)" | |
516 | string in the end). We know for sure, based on the Linux kernel | |
517 | code, that memory mappings whose associated filename is | |
518 | "/dev/zero" are guaranteed to be MAP_ANONYMOUS. */ | |
519 | compiled_regex dev_zero | |
520 | {"^/dev/zero\\( (deleted)\\)\\?$", REG_NOSUB, | |
521 | _("Could not compile regex to match /dev/zero filename")}; | |
522 | ||
523 | /* Matches "/SYSV%08x" filenames (with or without the "(deleted)" | |
524 | string in the end). These filenames refer to shared memory | |
525 | (shmem), and memory mappings associated with them are | |
526 | MAP_ANONYMOUS as well. */ | |
527 | compiled_regex shmem_file | |
528 | {"^/\\?SYSV[0-9a-fA-F]\\{8\\}\\( (deleted)\\)\\?$", REG_NOSUB, | |
529 | _("Could not compile regex to match shmem filenames")}; | |
530 | ||
531 | /* A heuristic we use to try to mimic the Linux kernel's 'n_link == | |
532 | 0' code, which is responsible to decide if it is dealing with a | |
533 | 'MAP_SHARED | MAP_ANONYMOUS' mapping. In other words, if | |
534 | FILE_DELETED matches, it does not necessarily mean that we are | |
535 | dealing with an anonymous shared mapping. However, there is no | |
536 | easy way to detect this currently, so this is the best | |
537 | approximation we have. | |
538 | ||
539 | As a result, GDB will dump readonly pages of deleted executables | |
540 | when using the default value of coredump_filter (0x33), while the | |
541 | Linux kernel will not dump those pages. But we can live with | |
542 | that. */ | |
543 | compiled_regex file_deleted | |
544 | {" (deleted)$", REG_NOSUB, | |
545 | _("Could not compile regex to match '<file> (deleted)'")}; | |
546 | }; | |
547 | ||
db1ff28b JK |
548 | /* Return 1 if the memory mapping is anonymous, 0 otherwise. |
549 | ||
550 | FILENAME is the name of the file present in the first line of the | |
551 | memory mapping, in the "/proc/PID/smaps" output. For example, if | |
552 | the first line is: | |
553 | ||
554 | 7fd0ca877000-7fd0d0da0000 r--p 00000000 fd:02 2100770 /path/to/file | |
555 | ||
556 | Then FILENAME will be "/path/to/file". */ | |
557 | ||
558 | static int | |
559 | mapping_is_anonymous_p (const char *filename) | |
560 | { | |
2d7cc5c7 | 561 | static gdb::optional<mapping_regexes> regexes; |
db1ff28b JK |
562 | static int init_regex_p = 0; |
563 | ||
564 | if (!init_regex_p) | |
565 | { | |
db1ff28b JK |
566 | /* Let's be pessimistic and assume there will be an error while |
567 | compiling the regex'es. */ | |
568 | init_regex_p = -1; | |
569 | ||
2d7cc5c7 | 570 | regexes.emplace (); |
db1ff28b JK |
571 | |
572 | /* If we reached this point, then everything succeeded. */ | |
573 | init_regex_p = 1; | |
574 | } | |
575 | ||
576 | if (init_regex_p == -1) | |
577 | { | |
578 | const char deleted[] = " (deleted)"; | |
579 | size_t del_len = sizeof (deleted) - 1; | |
580 | size_t filename_len = strlen (filename); | |
581 | ||
582 | /* There was an error while compiling the regex'es above. In | |
583 | order to try to give some reliable information to the caller, | |
584 | we just try to find the string " (deleted)" in the filename. | |
585 | If we managed to find it, then we assume the mapping is | |
586 | anonymous. */ | |
587 | return (filename_len >= del_len | |
588 | && strcmp (filename + filename_len - del_len, deleted) == 0); | |
589 | } | |
590 | ||
591 | if (*filename == '\0' | |
2d7cc5c7 PA |
592 | || regexes->dev_zero.exec (filename, 0, NULL, 0) == 0 |
593 | || regexes->shmem_file.exec (filename, 0, NULL, 0) == 0 | |
594 | || regexes->file_deleted.exec (filename, 0, NULL, 0) == 0) | |
db1ff28b JK |
595 | return 1; |
596 | ||
597 | return 0; | |
598 | } | |
599 | ||
600 | /* Return 0 if the memory mapping (which is related to FILTERFLAGS, V, | |
57e5e645 SDJ |
601 | MAYBE_PRIVATE_P, MAPPING_ANONYMOUS_P, ADDR and OFFSET) should not |
602 | be dumped, or greater than 0 if it should. | |
db1ff28b JK |
603 | |
604 | In a nutshell, this is the logic that we follow in order to decide | |
605 | if a mapping should be dumped or not. | |
606 | ||
607 | - If the mapping is associated to a file whose name ends with | |
608 | " (deleted)", or if the file is "/dev/zero", or if it is | |
609 | "/SYSV%08x" (shared memory), or if there is no file associated | |
610 | with it, or if the AnonHugePages: or the Anonymous: fields in the | |
611 | /proc/PID/smaps have contents, then GDB considers this mapping to | |
612 | be anonymous. Otherwise, GDB considers this mapping to be a | |
613 | file-backed mapping (because there will be a file associated with | |
614 | it). | |
615 | ||
616 | It is worth mentioning that, from all those checks described | |
617 | above, the most fragile is the one to see if the file name ends | |
618 | with " (deleted)". This does not necessarily mean that the | |
619 | mapping is anonymous, because the deleted file associated with | |
620 | the mapping may have been a hard link to another file, for | |
621 | example. The Linux kernel checks to see if "i_nlink == 0", but | |
622 | GDB cannot easily (and normally) do this check (iff running as | |
623 | root, it could find the mapping in /proc/PID/map_files/ and | |
624 | determine whether there still are other hard links to the | |
625 | inode/file). Therefore, we made a compromise here, and we assume | |
626 | that if the file name ends with " (deleted)", then the mapping is | |
627 | indeed anonymous. FWIW, this is something the Linux kernel could | |
628 | do better: expose this information in a more direct way. | |
629 | ||
630 | - If we see the flag "sh" in the "VmFlags:" field (in | |
631 | /proc/PID/smaps), then certainly the memory mapping is shared | |
632 | (VM_SHARED). If we have access to the VmFlags, and we don't see | |
633 | the "sh" there, then certainly the mapping is private. However, | |
634 | Linux kernels before commit | |
635 | 834f82e2aa9a8ede94b17b656329f850c1471514 (3.10) do not have the | |
636 | "VmFlags:" field; in that case, we use another heuristic: if we | |
637 | see 'p' in the permission flags, then we assume that the mapping | |
638 | is private, even though the presence of the 's' flag there would | |
639 | mean VM_MAYSHARE, which means the mapping could still be private. | |
57e5e645 SDJ |
640 | This should work OK enough, however. |
641 | ||
642 | - Even if, at the end, we decided that we should not dump the | |
643 | mapping, we still have to check if it is something like an ELF | |
644 | header (of a DSO or an executable, for example). If it is, and | |
645 | if the user is interested in dump it, then we should dump it. */ | |
db1ff28b JK |
646 | |
647 | static int | |
8d297bbf | 648 | dump_mapping_p (filter_flags filterflags, const struct smaps_vmflags *v, |
db1ff28b | 649 | int maybe_private_p, int mapping_anon_p, int mapping_file_p, |
57e5e645 | 650 | const char *filename, ULONGEST addr, ULONGEST offset) |
db1ff28b JK |
651 | { |
652 | /* Initially, we trust in what we received from our caller. This | |
653 | value may not be very precise (i.e., it was probably gathered | |
654 | from the permission line in the /proc/PID/smaps list, which | |
655 | actually refers to VM_MAYSHARE, and not VM_SHARED), but it is | |
656 | what we have until we take a look at the "VmFlags:" field | |
657 | (assuming that the version of the Linux kernel being used | |
658 | supports it, of course). */ | |
659 | int private_p = maybe_private_p; | |
57e5e645 | 660 | int dump_p; |
db1ff28b JK |
661 | |
662 | /* We always dump vDSO and vsyscall mappings, because it's likely that | |
663 | there'll be no file to read the contents from at core load time. | |
664 | The kernel does the same. */ | |
665 | if (strcmp ("[vdso]", filename) == 0 | |
666 | || strcmp ("[vsyscall]", filename) == 0) | |
667 | return 1; | |
668 | ||
669 | if (v->initialized_p) | |
670 | { | |
671 | /* We never dump I/O mappings. */ | |
672 | if (v->io_page) | |
673 | return 0; | |
674 | ||
675 | /* Check if we should exclude this mapping. */ | |
afa840dc | 676 | if (!dump_excluded_mappings && v->exclude_coredump) |
db1ff28b JK |
677 | return 0; |
678 | ||
679 | /* Update our notion of whether this mapping is shared or | |
680 | private based on a trustworthy value. */ | |
681 | private_p = !v->shared_mapping; | |
682 | ||
683 | /* HugeTLB checking. */ | |
684 | if (v->uses_huge_tlb) | |
685 | { | |
686 | if ((private_p && (filterflags & COREFILTER_HUGETLB_PRIVATE)) | |
687 | || (!private_p && (filterflags & COREFILTER_HUGETLB_SHARED))) | |
688 | return 1; | |
689 | ||
690 | return 0; | |
691 | } | |
692 | } | |
693 | ||
694 | if (private_p) | |
695 | { | |
696 | if (mapping_anon_p && mapping_file_p) | |
697 | { | |
698 | /* This is a special situation. It can happen when we see a | |
699 | mapping that is file-backed, but that contains anonymous | |
700 | pages. */ | |
57e5e645 SDJ |
701 | dump_p = ((filterflags & COREFILTER_ANON_PRIVATE) != 0 |
702 | || (filterflags & COREFILTER_MAPPED_PRIVATE) != 0); | |
db1ff28b JK |
703 | } |
704 | else if (mapping_anon_p) | |
57e5e645 | 705 | dump_p = (filterflags & COREFILTER_ANON_PRIVATE) != 0; |
db1ff28b | 706 | else |
57e5e645 | 707 | dump_p = (filterflags & COREFILTER_MAPPED_PRIVATE) != 0; |
db1ff28b JK |
708 | } |
709 | else | |
710 | { | |
711 | if (mapping_anon_p && mapping_file_p) | |
712 | { | |
713 | /* This is a special situation. It can happen when we see a | |
714 | mapping that is file-backed, but that contains anonymous | |
715 | pages. */ | |
57e5e645 SDJ |
716 | dump_p = ((filterflags & COREFILTER_ANON_SHARED) != 0 |
717 | || (filterflags & COREFILTER_MAPPED_SHARED) != 0); | |
db1ff28b JK |
718 | } |
719 | else if (mapping_anon_p) | |
57e5e645 | 720 | dump_p = (filterflags & COREFILTER_ANON_SHARED) != 0; |
db1ff28b | 721 | else |
57e5e645 | 722 | dump_p = (filterflags & COREFILTER_MAPPED_SHARED) != 0; |
db1ff28b | 723 | } |
57e5e645 SDJ |
724 | |
725 | /* Even if we decided that we shouldn't dump this mapping, we still | |
726 | have to check whether (a) the user wants us to dump mappings | |
727 | containing an ELF header, and (b) the mapping in question | |
728 | contains an ELF header. If (a) and (b) are true, then we should | |
729 | dump this mapping. | |
730 | ||
731 | A mapping contains an ELF header if it is a private mapping, its | |
732 | offset is zero, and its first word is ELFMAG. */ | |
733 | if (!dump_p && private_p && offset == 0 | |
734 | && (filterflags & COREFILTER_ELF_HEADERS) != 0) | |
735 | { | |
57e5e645 SDJ |
736 | /* Useful define specifying the size of the ELF magical |
737 | header. */ | |
738 | #ifndef SELFMAG | |
739 | #define SELFMAG 4 | |
740 | #endif | |
741 | ||
a5d871dd TT |
742 | /* Let's check if we have an ELF header. */ |
743 | gdb_byte h[SELFMAG]; | |
744 | if (target_read_memory (addr, h, SELFMAG) == 0) | |
57e5e645 | 745 | { |
57e5e645 SDJ |
746 | /* The EI_MAG* and ELFMAG* constants come from |
747 | <elf/common.h>. */ | |
748 | if (h[EI_MAG0] == ELFMAG0 && h[EI_MAG1] == ELFMAG1 | |
749 | && h[EI_MAG2] == ELFMAG2 && h[EI_MAG3] == ELFMAG3) | |
750 | { | |
751 | /* This mapping contains an ELF header, so we | |
752 | should dump it. */ | |
753 | dump_p = 1; | |
754 | } | |
755 | } | |
756 | } | |
757 | ||
758 | return dump_p; | |
db1ff28b JK |
759 | } |
760 | ||
4ba11f89 KB |
761 | /* As above, but return true only when we should dump the NT_FILE |
762 | entry. */ | |
763 | ||
764 | static int | |
765 | dump_note_entry_p (filter_flags filterflags, const struct smaps_vmflags *v, | |
766 | int maybe_private_p, int mapping_anon_p, int mapping_file_p, | |
767 | const char *filename, ULONGEST addr, ULONGEST offset) | |
768 | { | |
769 | /* vDSO and vsyscall mappings will end up in the core file. Don't | |
770 | put them in the NT_FILE note. */ | |
771 | if (strcmp ("[vdso]", filename) == 0 | |
772 | || strcmp ("[vsyscall]", filename) == 0) | |
773 | return 0; | |
774 | ||
775 | /* Otherwise, any other file-based mapping should be placed in the | |
776 | note. */ | |
5b7d45d3 | 777 | return 1; |
4ba11f89 KB |
778 | } |
779 | ||
3030c96e UW |
780 | /* Implement the "info proc" command. */ |
781 | ||
782 | static void | |
7bc112c1 | 783 | linux_info_proc (struct gdbarch *gdbarch, const char *args, |
3030c96e UW |
784 | enum info_proc_what what) |
785 | { | |
786 | /* A long is used for pid instead of an int to avoid a loss of precision | |
787 | compiler warning from the output of strtoul. */ | |
788 | long pid; | |
789 | int cmdline_f = (what == IP_MINIMAL || what == IP_CMDLINE || what == IP_ALL); | |
790 | int cwd_f = (what == IP_MINIMAL || what == IP_CWD || what == IP_ALL); | |
791 | int exe_f = (what == IP_MINIMAL || what == IP_EXE || what == IP_ALL); | |
792 | int mappings_f = (what == IP_MAPPINGS || what == IP_ALL); | |
793 | int status_f = (what == IP_STATUS || what == IP_ALL); | |
794 | int stat_f = (what == IP_STAT || what == IP_ALL); | |
795 | char filename[100]; | |
3030c96e UW |
796 | int target_errno; |
797 | ||
798 | if (args && isdigit (args[0])) | |
7bc112c1 TT |
799 | { |
800 | char *tem; | |
801 | ||
802 | pid = strtoul (args, &tem, 10); | |
803 | args = tem; | |
804 | } | |
3030c96e UW |
805 | else |
806 | { | |
55f6301a | 807 | if (!target_has_execution ()) |
3030c96e UW |
808 | error (_("No current process: you must name one.")); |
809 | if (current_inferior ()->fake_pid_p) | |
810 | error (_("Can't determine the current process's PID: you must name one.")); | |
811 | ||
812 | pid = current_inferior ()->pid; | |
813 | } | |
814 | ||
f1735a53 | 815 | args = skip_spaces (args); |
3030c96e UW |
816 | if (args && args[0]) |
817 | error (_("Too many parameters: %s"), args); | |
818 | ||
819 | printf_filtered (_("process %ld\n"), pid); | |
820 | if (cmdline_f) | |
821 | { | |
822 | xsnprintf (filename, sizeof filename, "/proc/%ld/cmdline", pid); | |
26d6cec4 AA |
823 | gdb_byte *buffer; |
824 | ssize_t len = target_fileio_read_alloc (NULL, filename, &buffer); | |
825 | ||
826 | if (len > 0) | |
827 | { | |
828 | gdb::unique_xmalloc_ptr<char> cmdline ((char *) buffer); | |
829 | ssize_t pos; | |
830 | ||
831 | for (pos = 0; pos < len - 1; pos++) | |
832 | { | |
833 | if (buffer[pos] == '\0') | |
834 | buffer[pos] = ' '; | |
835 | } | |
836 | buffer[len - 1] = '\0'; | |
837 | printf_filtered ("cmdline = '%s'\n", buffer); | |
838 | } | |
3030c96e UW |
839 | else |
840 | warning (_("unable to open /proc file '%s'"), filename); | |
841 | } | |
842 | if (cwd_f) | |
843 | { | |
844 | xsnprintf (filename, sizeof filename, "/proc/%ld/cwd", pid); | |
e0d3522b TT |
845 | gdb::optional<std::string> contents |
846 | = target_fileio_readlink (NULL, filename, &target_errno); | |
847 | if (contents.has_value ()) | |
848 | printf_filtered ("cwd = '%s'\n", contents->c_str ()); | |
3030c96e UW |
849 | else |
850 | warning (_("unable to read link '%s'"), filename); | |
851 | } | |
852 | if (exe_f) | |
853 | { | |
854 | xsnprintf (filename, sizeof filename, "/proc/%ld/exe", pid); | |
e0d3522b TT |
855 | gdb::optional<std::string> contents |
856 | = target_fileio_readlink (NULL, filename, &target_errno); | |
857 | if (contents.has_value ()) | |
858 | printf_filtered ("exe = '%s'\n", contents->c_str ()); | |
3030c96e UW |
859 | else |
860 | warning (_("unable to read link '%s'"), filename); | |
861 | } | |
862 | if (mappings_f) | |
863 | { | |
864 | xsnprintf (filename, sizeof filename, "/proc/%ld/maps", pid); | |
87028b87 TT |
865 | gdb::unique_xmalloc_ptr<char> map |
866 | = target_fileio_read_stralloc (NULL, filename); | |
867 | if (map != NULL) | |
3030c96e | 868 | { |
3030c96e UW |
869 | char *line; |
870 | ||
871 | printf_filtered (_("Mapped address spaces:\n\n")); | |
872 | if (gdbarch_addr_bit (gdbarch) == 32) | |
873 | { | |
874 | printf_filtered ("\t%10s %10s %10s %10s %s\n", | |
875 | "Start Addr", | |
876 | " End Addr", | |
877 | " Size", " Offset", "objfile"); | |
dda83cd7 | 878 | } |
3030c96e | 879 | else |
dda83cd7 | 880 | { |
3030c96e UW |
881 | printf_filtered (" %18s %18s %10s %10s %s\n", |
882 | "Start Addr", | |
883 | " End Addr", | |
884 | " Size", " Offset", "objfile"); | |
885 | } | |
886 | ||
ca3a04f6 CB |
887 | char *saveptr; |
888 | for (line = strtok_r (map.get (), "\n", &saveptr); | |
87028b87 | 889 | line; |
ca3a04f6 | 890 | line = strtok_r (NULL, "\n", &saveptr)) |
3030c96e UW |
891 | { |
892 | ULONGEST addr, endaddr, offset, inode; | |
b926417a | 893 | const char *permissions, *device, *mapping_filename; |
3030c96e UW |
894 | size_t permissions_len, device_len; |
895 | ||
896 | read_mapping (line, &addr, &endaddr, | |
897 | &permissions, &permissions_len, | |
898 | &offset, &device, &device_len, | |
b926417a | 899 | &inode, &mapping_filename); |
3030c96e UW |
900 | |
901 | if (gdbarch_addr_bit (gdbarch) == 32) | |
dda83cd7 SM |
902 | { |
903 | printf_filtered ("\t%10s %10s %10s %10s %s\n", | |
3030c96e UW |
904 | paddress (gdbarch, addr), |
905 | paddress (gdbarch, endaddr), | |
906 | hex_string (endaddr - addr), | |
907 | hex_string (offset), | |
b926417a | 908 | *mapping_filename ? mapping_filename : ""); |
3030c96e UW |
909 | } |
910 | else | |
dda83cd7 SM |
911 | { |
912 | printf_filtered (" %18s %18s %10s %10s %s\n", | |
3030c96e UW |
913 | paddress (gdbarch, addr), |
914 | paddress (gdbarch, endaddr), | |
915 | hex_string (endaddr - addr), | |
916 | hex_string (offset), | |
b926417a | 917 | *mapping_filename ? mapping_filename : ""); |
dda83cd7 | 918 | } |
3030c96e | 919 | } |
3030c96e UW |
920 | } |
921 | else | |
922 | warning (_("unable to open /proc file '%s'"), filename); | |
923 | } | |
924 | if (status_f) | |
925 | { | |
926 | xsnprintf (filename, sizeof filename, "/proc/%ld/status", pid); | |
87028b87 TT |
927 | gdb::unique_xmalloc_ptr<char> status |
928 | = target_fileio_read_stralloc (NULL, filename); | |
929 | if (status) | |
930 | puts_filtered (status.get ()); | |
3030c96e UW |
931 | else |
932 | warning (_("unable to open /proc file '%s'"), filename); | |
933 | } | |
934 | if (stat_f) | |
935 | { | |
936 | xsnprintf (filename, sizeof filename, "/proc/%ld/stat", pid); | |
87028b87 TT |
937 | gdb::unique_xmalloc_ptr<char> statstr |
938 | = target_fileio_read_stralloc (NULL, filename); | |
939 | if (statstr) | |
3030c96e | 940 | { |
87028b87 | 941 | const char *p = statstr.get (); |
3030c96e UW |
942 | |
943 | printf_filtered (_("Process: %s\n"), | |
944 | pulongest (strtoulst (p, &p, 10))); | |
945 | ||
f1735a53 | 946 | p = skip_spaces (p); |
a71b5a38 | 947 | if (*p == '(') |
3030c96e | 948 | { |
184cd072 JK |
949 | /* ps command also relies on no trailing fields |
950 | ever contain ')'. */ | |
951 | const char *ep = strrchr (p, ')'); | |
a71b5a38 UW |
952 | if (ep != NULL) |
953 | { | |
954 | printf_filtered ("Exec file: %.*s\n", | |
955 | (int) (ep - p - 1), p + 1); | |
956 | p = ep + 1; | |
957 | } | |
3030c96e UW |
958 | } |
959 | ||
f1735a53 | 960 | p = skip_spaces (p); |
3030c96e UW |
961 | if (*p) |
962 | printf_filtered (_("State: %c\n"), *p++); | |
963 | ||
964 | if (*p) | |
965 | printf_filtered (_("Parent process: %s\n"), | |
966 | pulongest (strtoulst (p, &p, 10))); | |
967 | if (*p) | |
968 | printf_filtered (_("Process group: %s\n"), | |
969 | pulongest (strtoulst (p, &p, 10))); | |
970 | if (*p) | |
971 | printf_filtered (_("Session id: %s\n"), | |
972 | pulongest (strtoulst (p, &p, 10))); | |
973 | if (*p) | |
974 | printf_filtered (_("TTY: %s\n"), | |
975 | pulongest (strtoulst (p, &p, 10))); | |
976 | if (*p) | |
977 | printf_filtered (_("TTY owner process group: %s\n"), | |
978 | pulongest (strtoulst (p, &p, 10))); | |
979 | ||
980 | if (*p) | |
981 | printf_filtered (_("Flags: %s\n"), | |
982 | hex_string (strtoulst (p, &p, 10))); | |
983 | if (*p) | |
984 | printf_filtered (_("Minor faults (no memory page): %s\n"), | |
985 | pulongest (strtoulst (p, &p, 10))); | |
986 | if (*p) | |
987 | printf_filtered (_("Minor faults, children: %s\n"), | |
988 | pulongest (strtoulst (p, &p, 10))); | |
989 | if (*p) | |
990 | printf_filtered (_("Major faults (memory page faults): %s\n"), | |
991 | pulongest (strtoulst (p, &p, 10))); | |
992 | if (*p) | |
993 | printf_filtered (_("Major faults, children: %s\n"), | |
994 | pulongest (strtoulst (p, &p, 10))); | |
995 | if (*p) | |
996 | printf_filtered (_("utime: %s\n"), | |
997 | pulongest (strtoulst (p, &p, 10))); | |
998 | if (*p) | |
999 | printf_filtered (_("stime: %s\n"), | |
1000 | pulongest (strtoulst (p, &p, 10))); | |
1001 | if (*p) | |
1002 | printf_filtered (_("utime, children: %s\n"), | |
1003 | pulongest (strtoulst (p, &p, 10))); | |
1004 | if (*p) | |
1005 | printf_filtered (_("stime, children: %s\n"), | |
1006 | pulongest (strtoulst (p, &p, 10))); | |
1007 | if (*p) | |
1008 | printf_filtered (_("jiffies remaining in current " | |
1009 | "time slice: %s\n"), | |
1010 | pulongest (strtoulst (p, &p, 10))); | |
1011 | if (*p) | |
1012 | printf_filtered (_("'nice' value: %s\n"), | |
1013 | pulongest (strtoulst (p, &p, 10))); | |
1014 | if (*p) | |
1015 | printf_filtered (_("jiffies until next timeout: %s\n"), | |
1016 | pulongest (strtoulst (p, &p, 10))); | |
1017 | if (*p) | |
1018 | printf_filtered (_("jiffies until next SIGALRM: %s\n"), | |
1019 | pulongest (strtoulst (p, &p, 10))); | |
1020 | if (*p) | |
1021 | printf_filtered (_("start time (jiffies since " | |
1022 | "system boot): %s\n"), | |
1023 | pulongest (strtoulst (p, &p, 10))); | |
1024 | if (*p) | |
1025 | printf_filtered (_("Virtual memory size: %s\n"), | |
1026 | pulongest (strtoulst (p, &p, 10))); | |
1027 | if (*p) | |
1028 | printf_filtered (_("Resident set size: %s\n"), | |
1029 | pulongest (strtoulst (p, &p, 10))); | |
1030 | if (*p) | |
1031 | printf_filtered (_("rlim: %s\n"), | |
1032 | pulongest (strtoulst (p, &p, 10))); | |
1033 | if (*p) | |
1034 | printf_filtered (_("Start of text: %s\n"), | |
1035 | hex_string (strtoulst (p, &p, 10))); | |
1036 | if (*p) | |
1037 | printf_filtered (_("End of text: %s\n"), | |
1038 | hex_string (strtoulst (p, &p, 10))); | |
1039 | if (*p) | |
1040 | printf_filtered (_("Start of stack: %s\n"), | |
1041 | hex_string (strtoulst (p, &p, 10))); | |
1042 | #if 0 /* Don't know how architecture-dependent the rest is... | |
1043 | Anyway the signal bitmap info is available from "status". */ | |
1044 | if (*p) | |
1045 | printf_filtered (_("Kernel stack pointer: %s\n"), | |
1046 | hex_string (strtoulst (p, &p, 10))); | |
1047 | if (*p) | |
1048 | printf_filtered (_("Kernel instr pointer: %s\n"), | |
1049 | hex_string (strtoulst (p, &p, 10))); | |
1050 | if (*p) | |
1051 | printf_filtered (_("Pending signals bitmap: %s\n"), | |
1052 | hex_string (strtoulst (p, &p, 10))); | |
1053 | if (*p) | |
1054 | printf_filtered (_("Blocked signals bitmap: %s\n"), | |
1055 | hex_string (strtoulst (p, &p, 10))); | |
1056 | if (*p) | |
1057 | printf_filtered (_("Ignored signals bitmap: %s\n"), | |
1058 | hex_string (strtoulst (p, &p, 10))); | |
1059 | if (*p) | |
1060 | printf_filtered (_("Catched signals bitmap: %s\n"), | |
1061 | hex_string (strtoulst (p, &p, 10))); | |
1062 | if (*p) | |
1063 | printf_filtered (_("wchan (system call): %s\n"), | |
1064 | hex_string (strtoulst (p, &p, 10))); | |
1065 | #endif | |
3030c96e UW |
1066 | } |
1067 | else | |
1068 | warning (_("unable to open /proc file '%s'"), filename); | |
1069 | } | |
1070 | } | |
1071 | ||
db082f59 KB |
1072 | /* Implementation of `gdbarch_read_core_file_mappings', as defined in |
1073 | gdbarch.h. | |
1074 | ||
1075 | This function reads the NT_FILE note (which BFD turns into the | |
1076 | section ".note.linuxcore.file"). The format of this note / section | |
1077 | is described as follows in the Linux kernel sources in | |
1078 | fs/binfmt_elf.c: | |
1079 | ||
1080 | long count -- how many files are mapped | |
1081 | long page_size -- units for file_ofs | |
1082 | array of [COUNT] elements of | |
1083 | long start | |
1084 | long end | |
1085 | long file_ofs | |
1086 | followed by COUNT filenames in ASCII: "FILE1" NUL "FILE2" NUL... | |
1087 | ||
1088 | CBFD is the BFD of the core file. | |
1089 | ||
1090 | PRE_LOOP_CB is the callback function to invoke prior to starting | |
1091 | the loop which processes individual entries. This callback will | |
1092 | only be executed after the note has been examined in enough | |
1093 | detail to verify that it's not malformed in some way. | |
1094 | ||
1095 | LOOP_CB is the callback function that will be executed once | |
1096 | for each mapping. */ | |
451b7c33 TT |
1097 | |
1098 | static void | |
db082f59 KB |
1099 | linux_read_core_file_mappings (struct gdbarch *gdbarch, |
1100 | struct bfd *cbfd, | |
1101 | gdb::function_view<void (ULONGEST count)> | |
dda83cd7 | 1102 | pre_loop_cb, |
db082f59 | 1103 | gdb::function_view<void (int num, |
dda83cd7 | 1104 | ULONGEST start, |
db082f59 KB |
1105 | ULONGEST end, |
1106 | ULONGEST file_ofs, | |
70125a45 | 1107 | const char *filename)> |
db082f59 | 1108 | loop_cb) |
451b7c33 | 1109 | { |
db082f59 | 1110 | /* Ensure that ULONGEST is big enough for reading 64-bit core files. */ |
451b7c33 TT |
1111 | gdb_static_assert (sizeof (ULONGEST) >= 8); |
1112 | ||
db082f59 KB |
1113 | /* It's not required that the NT_FILE note exists, so return silently |
1114 | if it's not found. Beyond this point though, we'll complain | |
1115 | if problems are found. */ | |
1116 | asection *section = bfd_get_section_by_name (cbfd, ".note.linuxcore.file"); | |
1117 | if (section == nullptr) | |
1118 | return; | |
451b7c33 | 1119 | |
db082f59 KB |
1120 | unsigned int addr_size_bits = gdbarch_addr_bit (gdbarch); |
1121 | unsigned int addr_size = addr_size_bits / 8; | |
1122 | size_t note_size = bfd_section_size (section); | |
451b7c33 TT |
1123 | |
1124 | if (note_size < 2 * addr_size) | |
db082f59 KB |
1125 | { |
1126 | warning (_("malformed core note - too short for header")); | |
1127 | return; | |
1128 | } | |
451b7c33 | 1129 | |
db082f59 | 1130 | gdb::def_vector<gdb_byte> contents (note_size); |
9f584b37 TT |
1131 | if (!bfd_get_section_contents (core_bfd, section, contents.data (), |
1132 | 0, note_size)) | |
db082f59 KB |
1133 | { |
1134 | warning (_("could not get core note contents")); | |
1135 | return; | |
1136 | } | |
451b7c33 | 1137 | |
db082f59 KB |
1138 | gdb_byte *descdata = contents.data (); |
1139 | char *descend = (char *) descdata + note_size; | |
451b7c33 TT |
1140 | |
1141 | if (descdata[note_size - 1] != '\0') | |
db082f59 KB |
1142 | { |
1143 | warning (_("malformed note - does not end with \\0")); | |
1144 | return; | |
1145 | } | |
451b7c33 | 1146 | |
db082f59 | 1147 | ULONGEST count = bfd_get (addr_size_bits, core_bfd, descdata); |
451b7c33 TT |
1148 | descdata += addr_size; |
1149 | ||
db082f59 | 1150 | ULONGEST page_size = bfd_get (addr_size_bits, core_bfd, descdata); |
451b7c33 TT |
1151 | descdata += addr_size; |
1152 | ||
1153 | if (note_size < 2 * addr_size + count * 3 * addr_size) | |
451b7c33 | 1154 | { |
db082f59 KB |
1155 | warning (_("malformed note - too short for supplied file count")); |
1156 | return; | |
451b7c33 TT |
1157 | } |
1158 | ||
db082f59 KB |
1159 | char *filenames = (char *) descdata + count * 3 * addr_size; |
1160 | ||
1161 | /* Make sure that the correct number of filenames exist. Complain | |
1162 | if there aren't enough or are too many. */ | |
1163 | char *f = filenames; | |
1164 | for (int i = 0; i < count; i++) | |
451b7c33 | 1165 | { |
db082f59 | 1166 | if (f >= descend) |
dda83cd7 | 1167 | { |
db082f59 KB |
1168 | warning (_("malformed note - filename area is too small")); |
1169 | return; | |
1170 | } | |
1171 | f += strnlen (f, descend - f) + 1; | |
1172 | } | |
1173 | /* Complain, but don't return early if the filename area is too big. */ | |
1174 | if (f != descend) | |
1175 | warning (_("malformed note - filename area is too big")); | |
451b7c33 | 1176 | |
db082f59 | 1177 | pre_loop_cb (count); |
451b7c33 | 1178 | |
db082f59 KB |
1179 | for (int i = 0; i < count; i++) |
1180 | { | |
1181 | ULONGEST start = bfd_get (addr_size_bits, core_bfd, descdata); | |
451b7c33 | 1182 | descdata += addr_size; |
db082f59 | 1183 | ULONGEST end = bfd_get (addr_size_bits, core_bfd, descdata); |
451b7c33 | 1184 | descdata += addr_size; |
db082f59 | 1185 | ULONGEST file_ofs |
dda83cd7 | 1186 | = bfd_get (addr_size_bits, core_bfd, descdata) * page_size; |
451b7c33 | 1187 | descdata += addr_size; |
db082f59 KB |
1188 | char * filename = filenames; |
1189 | filenames += strlen ((char *) filenames) + 1; | |
451b7c33 | 1190 | |
70125a45 | 1191 | loop_cb (i, start, end, file_ofs, filename); |
451b7c33 | 1192 | } |
451b7c33 TT |
1193 | } |
1194 | ||
db082f59 KB |
1195 | /* Implement "info proc mappings" for a corefile. */ |
1196 | ||
1197 | static void | |
1198 | linux_core_info_proc_mappings (struct gdbarch *gdbarch, const char *args) | |
1199 | { | |
1200 | linux_read_core_file_mappings (gdbarch, core_bfd, | |
1201 | [=] (ULONGEST count) | |
1202 | { | |
1203 | printf_filtered (_("Mapped address spaces:\n\n")); | |
1204 | if (gdbarch_addr_bit (gdbarch) == 32) | |
1205 | { | |
1206 | printf_filtered ("\t%10s %10s %10s %10s %s\n", | |
1207 | "Start Addr", | |
1208 | " End Addr", | |
1209 | " Size", " Offset", "objfile"); | |
1210 | } | |
1211 | else | |
1212 | { | |
1213 | printf_filtered (" %18s %18s %10s %10s %s\n", | |
1214 | "Start Addr", | |
1215 | " End Addr", | |
1216 | " Size", " Offset", "objfile"); | |
1217 | } | |
1218 | }, | |
1219 | [=] (int num, ULONGEST start, ULONGEST end, ULONGEST file_ofs, | |
70125a45 | 1220 | const char *filename) |
db082f59 KB |
1221 | { |
1222 | if (gdbarch_addr_bit (gdbarch) == 32) | |
1223 | printf_filtered ("\t%10s %10s %10s %10s %s\n", | |
1224 | paddress (gdbarch, start), | |
1225 | paddress (gdbarch, end), | |
1226 | hex_string (end - start), | |
1227 | hex_string (file_ofs), | |
1228 | filename); | |
1229 | else | |
1230 | printf_filtered (" %18s %18s %10s %10s %s\n", | |
1231 | paddress (gdbarch, start), | |
1232 | paddress (gdbarch, end), | |
1233 | hex_string (end - start), | |
1234 | hex_string (file_ofs), | |
1235 | filename); | |
1236 | }); | |
1237 | } | |
1238 | ||
451b7c33 TT |
1239 | /* Implement "info proc" for a corefile. */ |
1240 | ||
1241 | static void | |
7bc112c1 | 1242 | linux_core_info_proc (struct gdbarch *gdbarch, const char *args, |
451b7c33 TT |
1243 | enum info_proc_what what) |
1244 | { | |
1245 | int exe_f = (what == IP_MINIMAL || what == IP_EXE || what == IP_ALL); | |
1246 | int mappings_f = (what == IP_MAPPINGS || what == IP_ALL); | |
1247 | ||
1248 | if (exe_f) | |
1249 | { | |
1250 | const char *exe; | |
1251 | ||
1252 | exe = bfd_core_file_failing_command (core_bfd); | |
1253 | if (exe != NULL) | |
1254 | printf_filtered ("exe = '%s'\n", exe); | |
1255 | else | |
1256 | warning (_("unable to find command name in core file")); | |
1257 | } | |
1258 | ||
1259 | if (mappings_f) | |
1260 | linux_core_info_proc_mappings (gdbarch, args); | |
1261 | ||
1262 | if (!exe_f && !mappings_f) | |
1263 | error (_("unable to handle request")); | |
1264 | } | |
1265 | ||
382b69bb JB |
1266 | /* Read siginfo data from the core, if possible. Returns -1 on |
1267 | failure. Otherwise, returns the number of bytes read. READBUF, | |
1268 | OFFSET, and LEN are all as specified by the to_xfer_partial | |
1269 | interface. */ | |
1270 | ||
1271 | static LONGEST | |
1272 | linux_core_xfer_siginfo (struct gdbarch *gdbarch, gdb_byte *readbuf, | |
1273 | ULONGEST offset, ULONGEST len) | |
1274 | { | |
1275 | thread_section_name section_name (".note.linuxcore.siginfo", inferior_ptid); | |
1276 | asection *section = bfd_get_section_by_name (core_bfd, section_name.c_str ()); | |
1277 | if (section == NULL) | |
1278 | return -1; | |
1279 | ||
1280 | if (!bfd_get_section_contents (core_bfd, section, readbuf, offset, len)) | |
1281 | return -1; | |
1282 | ||
1283 | return len; | |
1284 | } | |
1285 | ||
db1ff28b JK |
1286 | typedef int linux_find_memory_region_ftype (ULONGEST vaddr, ULONGEST size, |
1287 | ULONGEST offset, ULONGEST inode, | |
1288 | int read, int write, | |
1289 | int exec, int modified, | |
1290 | const char *filename, | |
1291 | void *data); | |
451b7c33 | 1292 | |
4ba11f89 KB |
1293 | typedef int linux_dump_mapping_p_ftype (filter_flags filterflags, |
1294 | const struct smaps_vmflags *v, | |
1295 | int maybe_private_p, | |
1296 | int mapping_anon_p, | |
1297 | int mapping_file_p, | |
1298 | const char *filename, | |
1299 | ULONGEST addr, | |
1300 | ULONGEST offset); | |
1301 | ||
1e735120 LM |
1302 | /* Helper function to parse the contents of /proc/<pid>/smaps into a data |
1303 | structure, for easy access. | |
1304 | ||
1305 | DATA is the contents of the smaps file. The parsed contents are stored | |
1306 | into the SMAPS vector. */ | |
1307 | ||
1308 | static std::vector<struct smaps_data> | |
1309 | parse_smaps_data (const char *data, | |
1310 | const std::string maps_filename) | |
1311 | { | |
1312 | char *line, *t; | |
1313 | ||
1314 | gdb_assert (data != nullptr); | |
1315 | ||
1316 | line = strtok_r ((char *) data, "\n", &t); | |
1317 | ||
1318 | std::vector<struct smaps_data> smaps; | |
1319 | ||
1320 | while (line != NULL) | |
1321 | { | |
1322 | ULONGEST addr, endaddr, offset, inode; | |
1323 | const char *permissions, *device, *filename; | |
1324 | struct smaps_vmflags v; | |
1325 | size_t permissions_len, device_len; | |
1326 | int read, write, exec, priv; | |
1327 | int has_anonymous = 0; | |
1328 | int mapping_anon_p; | |
1329 | int mapping_file_p; | |
1330 | ||
1331 | memset (&v, 0, sizeof (v)); | |
1332 | read_mapping (line, &addr, &endaddr, &permissions, &permissions_len, | |
1333 | &offset, &device, &device_len, &inode, &filename); | |
1334 | mapping_anon_p = mapping_is_anonymous_p (filename); | |
1335 | /* If the mapping is not anonymous, then we can consider it | |
1336 | to be file-backed. These two states (anonymous or | |
1337 | file-backed) seem to be exclusive, but they can actually | |
1338 | coexist. For example, if a file-backed mapping has | |
1339 | "Anonymous:" pages (see more below), then the Linux | |
1340 | kernel will dump this mapping when the user specified | |
1341 | that she only wants anonymous mappings in the corefile | |
1342 | (*even* when she explicitly disabled the dumping of | |
1343 | file-backed mappings). */ | |
1344 | mapping_file_p = !mapping_anon_p; | |
1345 | ||
1346 | /* Decode permissions. */ | |
1347 | read = (memchr (permissions, 'r', permissions_len) != 0); | |
1348 | write = (memchr (permissions, 'w', permissions_len) != 0); | |
1349 | exec = (memchr (permissions, 'x', permissions_len) != 0); | |
1350 | /* 'private' here actually means VM_MAYSHARE, and not | |
1351 | VM_SHARED. In order to know if a mapping is really | |
1352 | private or not, we must check the flag "sh" in the | |
1353 | VmFlags field. This is done by decode_vmflags. However, | |
1354 | if we are using a Linux kernel released before the commit | |
1355 | 834f82e2aa9a8ede94b17b656329f850c1471514 (3.10), we will | |
1356 | not have the VmFlags there. In this case, there is | |
1357 | really no way to know if we are dealing with VM_SHARED, | |
1358 | so we just assume that VM_MAYSHARE is enough. */ | |
1359 | priv = memchr (permissions, 'p', permissions_len) != 0; | |
1360 | ||
1361 | /* Try to detect if region should be dumped by parsing smaps | |
1362 | counters. */ | |
1363 | for (line = strtok_r (NULL, "\n", &t); | |
1364 | line != NULL && line[0] >= 'A' && line[0] <= 'Z'; | |
1365 | line = strtok_r (NULL, "\n", &t)) | |
1366 | { | |
1367 | char keyword[64 + 1]; | |
1368 | ||
1369 | if (sscanf (line, "%64s", keyword) != 1) | |
1370 | { | |
1371 | warning (_("Error parsing {s,}maps file '%s'"), | |
1372 | maps_filename.c_str ()); | |
1373 | break; | |
1374 | } | |
1375 | ||
1376 | if (strcmp (keyword, "Anonymous:") == 0) | |
1377 | { | |
1378 | /* Older Linux kernels did not support the | |
1379 | "Anonymous:" counter. Check it here. */ | |
1380 | has_anonymous = 1; | |
1381 | } | |
1382 | else if (strcmp (keyword, "VmFlags:") == 0) | |
1383 | decode_vmflags (line, &v); | |
1384 | ||
1385 | if (strcmp (keyword, "AnonHugePages:") == 0 | |
1386 | || strcmp (keyword, "Anonymous:") == 0) | |
1387 | { | |
1388 | unsigned long number; | |
1389 | ||
1390 | if (sscanf (line, "%*s%lu", &number) != 1) | |
1391 | { | |
1392 | warning (_("Error parsing {s,}maps file '%s' number"), | |
1393 | maps_filename.c_str ()); | |
1394 | break; | |
1395 | } | |
1396 | if (number > 0) | |
1397 | { | |
1398 | /* Even if we are dealing with a file-backed | |
1399 | mapping, if it contains anonymous pages we | |
1400 | consider it to be *also* an anonymous | |
1401 | mapping, because this is what the Linux | |
1402 | kernel does: | |
1403 | ||
1404 | // Dump segments that have been written to. | |
1405 | if (vma->anon_vma && FILTER(ANON_PRIVATE)) | |
1406 | goto whole; | |
1407 | ||
1408 | Note that if the mapping is already marked as | |
1409 | file-backed (i.e., mapping_file_p is | |
1410 | non-zero), then this is a special case, and | |
1411 | this mapping will be dumped either when the | |
1412 | user wants to dump file-backed *or* anonymous | |
1413 | mappings. */ | |
1414 | mapping_anon_p = 1; | |
1415 | } | |
1416 | } | |
1417 | } | |
1418 | /* Save the smaps entry to the vector. */ | |
1419 | struct smaps_data map; | |
1420 | ||
1421 | map.start_address = addr; | |
1422 | map.end_address = endaddr; | |
1423 | map.filename = filename; | |
1424 | map.vmflags = v; | |
1425 | map.read = read? true : false; | |
1426 | map.write = write? true : false; | |
1427 | map.exec = exec? true : false; | |
1428 | map.priv = priv? true : false; | |
1429 | map.has_anonymous = has_anonymous; | |
1430 | map.mapping_anon_p = mapping_anon_p? true : false; | |
1431 | map.mapping_file_p = mapping_file_p? true : false; | |
1432 | map.offset = offset; | |
1433 | map.inode = inode; | |
1434 | ||
1435 | smaps.emplace_back (map); | |
1436 | } | |
1437 | ||
1438 | return smaps; | |
1439 | } | |
1440 | ||
1441 | /* See linux-tdep.h. */ | |
1442 | ||
1443 | bool | |
1444 | linux_address_in_memtag_page (CORE_ADDR address) | |
1445 | { | |
1446 | if (current_inferior ()->fake_pid_p) | |
1447 | return false; | |
1448 | ||
1449 | pid_t pid = current_inferior ()->pid; | |
1450 | ||
1451 | std::string smaps_file = string_printf ("/proc/%d/smaps", pid); | |
1452 | ||
1453 | gdb::unique_xmalloc_ptr<char> data | |
1454 | = target_fileio_read_stralloc (NULL, smaps_file.c_str ()); | |
1455 | ||
1456 | if (data == nullptr) | |
1457 | return false; | |
1458 | ||
1459 | /* Parse the contents of smaps into a vector. */ | |
1460 | std::vector<struct smaps_data> smaps | |
1461 | = parse_smaps_data (data.get (), smaps_file); | |
1462 | ||
1463 | for (const smaps_data &map : smaps) | |
1464 | { | |
1465 | /* Is the address within [start_address, end_address) in a page | |
1466 | mapped with memory tagging? */ | |
1467 | if (address >= map.start_address | |
1468 | && address < map.end_address | |
1469 | && map.vmflags.memory_tagging) | |
1470 | return true; | |
1471 | } | |
1472 | ||
1473 | return false; | |
1474 | } | |
1475 | ||
db1ff28b | 1476 | /* List memory regions in the inferior for a corefile. */ |
451b7c33 TT |
1477 | |
1478 | static int | |
db1ff28b | 1479 | linux_find_memory_regions_full (struct gdbarch *gdbarch, |
4ba11f89 | 1480 | linux_dump_mapping_p_ftype *should_dump_mapping_p, |
db1ff28b JK |
1481 | linux_find_memory_region_ftype *func, |
1482 | void *obfd) | |
f7af1fcd JK |
1483 | { |
1484 | pid_t pid; | |
1485 | /* Default dump behavior of coredump_filter (0x33), according to | |
1486 | Documentation/filesystems/proc.txt from the Linux kernel | |
1487 | tree. */ | |
8d297bbf PA |
1488 | filter_flags filterflags = (COREFILTER_ANON_PRIVATE |
1489 | | COREFILTER_ANON_SHARED | |
1490 | | COREFILTER_ELF_HEADERS | |
1491 | | COREFILTER_HUGETLB_PRIVATE); | |
f7af1fcd | 1492 | |
db1ff28b | 1493 | /* We need to know the real target PID to access /proc. */ |
f7af1fcd | 1494 | if (current_inferior ()->fake_pid_p) |
db1ff28b | 1495 | return 1; |
f7af1fcd JK |
1496 | |
1497 | pid = current_inferior ()->pid; | |
1498 | ||
1499 | if (use_coredump_filter) | |
1500 | { | |
93e447c6 LM |
1501 | std::string core_dump_filter_name |
1502 | = string_printf ("/proc/%d/coredump_filter", pid); | |
1503 | ||
87028b87 | 1504 | gdb::unique_xmalloc_ptr<char> coredumpfilterdata |
93e447c6 LM |
1505 | = target_fileio_read_stralloc (NULL, core_dump_filter_name.c_str ()); |
1506 | ||
f7af1fcd JK |
1507 | if (coredumpfilterdata != NULL) |
1508 | { | |
8d297bbf PA |
1509 | unsigned int flags; |
1510 | ||
87028b87 | 1511 | sscanf (coredumpfilterdata.get (), "%x", &flags); |
8d297bbf | 1512 | filterflags = (enum filter_flag) flags; |
f7af1fcd JK |
1513 | } |
1514 | } | |
1515 | ||
93e447c6 LM |
1516 | std::string maps_filename = string_printf ("/proc/%d/smaps", pid); |
1517 | ||
87028b87 | 1518 | gdb::unique_xmalloc_ptr<char> data |
93e447c6 LM |
1519 | = target_fileio_read_stralloc (NULL, maps_filename.c_str ()); |
1520 | ||
db1ff28b JK |
1521 | if (data == NULL) |
1522 | { | |
1523 | /* Older Linux kernels did not support /proc/PID/smaps. */ | |
93e447c6 LM |
1524 | maps_filename = string_printf ("/proc/%d/maps", pid); |
1525 | data = target_fileio_read_stralloc (NULL, maps_filename.c_str ()); | |
1e735120 LM |
1526 | |
1527 | if (data == nullptr) | |
1528 | return 1; | |
db1ff28b JK |
1529 | } |
1530 | ||
1e735120 LM |
1531 | /* Parse the contents of smaps into a vector. */ |
1532 | std::vector<struct smaps_data> smaps | |
1533 | = parse_smaps_data (data.get (), maps_filename.c_str ()); | |
1534 | ||
1535 | for (const struct smaps_data &map : smaps) | |
db1ff28b | 1536 | { |
1e735120 | 1537 | int should_dump_p = 0; |
db1ff28b | 1538 | |
1e735120 | 1539 | if (map.has_anonymous) |
db1ff28b | 1540 | { |
1e735120 LM |
1541 | should_dump_p |
1542 | = should_dump_mapping_p (filterflags, &map.vmflags, | |
1543 | map.priv, | |
1544 | map.mapping_anon_p, | |
1545 | map.mapping_file_p, | |
1546 | map.filename.c_str (), | |
1547 | map.start_address, | |
1548 | map.offset); | |
1549 | } | |
1550 | else | |
1551 | { | |
1552 | /* Older Linux kernels did not support the "Anonymous:" counter. | |
1553 | If it is missing, we can't be sure - dump all the pages. */ | |
1554 | should_dump_p = 1; | |
db1ff28b JK |
1555 | } |
1556 | ||
1e735120 LM |
1557 | /* Invoke the callback function to create the corefile segment. */ |
1558 | if (should_dump_p) | |
1559 | { | |
1560 | func (map.start_address, map.end_address - map.start_address, | |
1561 | map.offset, map.inode, map.read, map.write, map.exec, | |
1562 | 1, /* MODIFIED is true because we want to dump | |
1563 | the mapping. */ | |
1564 | map.filename.c_str (), obfd); | |
1565 | } | |
db1ff28b JK |
1566 | } |
1567 | ||
1e735120 | 1568 | return 0; |
db1ff28b JK |
1569 | } |
1570 | ||
1571 | /* A structure for passing information through | |
1572 | linux_find_memory_regions_full. */ | |
1573 | ||
1574 | struct linux_find_memory_regions_data | |
1575 | { | |
1576 | /* The original callback. */ | |
1577 | ||
1578 | find_memory_region_ftype func; | |
1579 | ||
1580 | /* The original datum. */ | |
1581 | ||
1582 | void *obfd; | |
1583 | }; | |
1584 | ||
1585 | /* A callback for linux_find_memory_regions that converts between the | |
1586 | "full"-style callback and find_memory_region_ftype. */ | |
1587 | ||
1588 | static int | |
1589 | linux_find_memory_regions_thunk (ULONGEST vaddr, ULONGEST size, | |
1590 | ULONGEST offset, ULONGEST inode, | |
1591 | int read, int write, int exec, int modified, | |
1592 | const char *filename, void *arg) | |
1593 | { | |
9a3c8263 SM |
1594 | struct linux_find_memory_regions_data *data |
1595 | = (struct linux_find_memory_regions_data *) arg; | |
db1ff28b JK |
1596 | |
1597 | return data->func (vaddr, size, read, write, exec, modified, data->obfd); | |
451b7c33 TT |
1598 | } |
1599 | ||
1600 | /* A variant of linux_find_memory_regions_full that is suitable as the | |
1601 | gdbarch find_memory_regions method. */ | |
1602 | ||
1603 | static int | |
1604 | linux_find_memory_regions (struct gdbarch *gdbarch, | |
db1ff28b | 1605 | find_memory_region_ftype func, void *obfd) |
451b7c33 TT |
1606 | { |
1607 | struct linux_find_memory_regions_data data; | |
1608 | ||
1609 | data.func = func; | |
db1ff28b | 1610 | data.obfd = obfd; |
451b7c33 | 1611 | |
db1ff28b | 1612 | return linux_find_memory_regions_full (gdbarch, |
4ba11f89 | 1613 | dump_mapping_p, |
db1ff28b JK |
1614 | linux_find_memory_regions_thunk, |
1615 | &data); | |
451b7c33 TT |
1616 | } |
1617 | ||
451b7c33 TT |
1618 | /* This is used to pass information from |
1619 | linux_make_mappings_corefile_notes through | |
1620 | linux_find_memory_regions_full. */ | |
1621 | ||
1622 | struct linux_make_mappings_data | |
1623 | { | |
1624 | /* Number of files mapped. */ | |
1625 | ULONGEST file_count; | |
1626 | ||
1627 | /* The obstack for the main part of the data. */ | |
1628 | struct obstack *data_obstack; | |
1629 | ||
1630 | /* The filename obstack. */ | |
1631 | struct obstack *filename_obstack; | |
1632 | ||
1633 | /* The architecture's "long" type. */ | |
1634 | struct type *long_type; | |
1635 | }; | |
1636 | ||
1637 | static linux_find_memory_region_ftype linux_make_mappings_callback; | |
1638 | ||
1639 | /* A callback for linux_find_memory_regions_full that updates the | |
1640 | mappings data for linux_make_mappings_corefile_notes. */ | |
1641 | ||
1642 | static int | |
1643 | linux_make_mappings_callback (ULONGEST vaddr, ULONGEST size, | |
1644 | ULONGEST offset, ULONGEST inode, | |
1645 | int read, int write, int exec, int modified, | |
1646 | const char *filename, void *data) | |
1647 | { | |
9a3c8263 SM |
1648 | struct linux_make_mappings_data *map_data |
1649 | = (struct linux_make_mappings_data *) data; | |
451b7c33 TT |
1650 | gdb_byte buf[sizeof (ULONGEST)]; |
1651 | ||
1652 | if (*filename == '\0' || inode == 0) | |
1653 | return 0; | |
1654 | ||
1655 | ++map_data->file_count; | |
1656 | ||
1657 | pack_long (buf, map_data->long_type, vaddr); | |
1658 | obstack_grow (map_data->data_obstack, buf, TYPE_LENGTH (map_data->long_type)); | |
1659 | pack_long (buf, map_data->long_type, vaddr + size); | |
1660 | obstack_grow (map_data->data_obstack, buf, TYPE_LENGTH (map_data->long_type)); | |
1661 | pack_long (buf, map_data->long_type, offset); | |
1662 | obstack_grow (map_data->data_obstack, buf, TYPE_LENGTH (map_data->long_type)); | |
1663 | ||
1664 | obstack_grow_str0 (map_data->filename_obstack, filename); | |
1665 | ||
1666 | return 0; | |
1667 | } | |
1668 | ||
1669 | /* Write the file mapping data to the core file, if possible. OBFD is | |
1670 | the output BFD. NOTE_DATA is the current note data, and NOTE_SIZE | |
c21f37a8 | 1671 | is a pointer to the note size. Updates NOTE_DATA and NOTE_SIZE. */ |
451b7c33 | 1672 | |
c21f37a8 | 1673 | static void |
451b7c33 | 1674 | linux_make_mappings_corefile_notes (struct gdbarch *gdbarch, bfd *obfd, |
c21f37a8 SM |
1675 | gdb::unique_xmalloc_ptr<char> ¬e_data, |
1676 | int *note_size) | |
451b7c33 | 1677 | { |
451b7c33 TT |
1678 | struct linux_make_mappings_data mapping_data; |
1679 | struct type *long_type | |
1680 | = arch_integer_type (gdbarch, gdbarch_long_bit (gdbarch), 0, "long"); | |
1681 | gdb_byte buf[sizeof (ULONGEST)]; | |
1682 | ||
8268c778 | 1683 | auto_obstack data_obstack, filename_obstack; |
451b7c33 TT |
1684 | |
1685 | mapping_data.file_count = 0; | |
1686 | mapping_data.data_obstack = &data_obstack; | |
1687 | mapping_data.filename_obstack = &filename_obstack; | |
1688 | mapping_data.long_type = long_type; | |
1689 | ||
1690 | /* Reserve space for the count. */ | |
1691 | obstack_blank (&data_obstack, TYPE_LENGTH (long_type)); | |
1692 | /* We always write the page size as 1 since we have no good way to | |
1693 | determine the correct value. */ | |
1694 | pack_long (buf, long_type, 1); | |
1695 | obstack_grow (&data_obstack, buf, TYPE_LENGTH (long_type)); | |
1696 | ||
4ba11f89 KB |
1697 | linux_find_memory_regions_full (gdbarch, |
1698 | dump_note_entry_p, | |
1699 | linux_make_mappings_callback, | |
db1ff28b | 1700 | &mapping_data); |
451b7c33 TT |
1701 | |
1702 | if (mapping_data.file_count != 0) | |
1703 | { | |
1704 | /* Write the count to the obstack. */ | |
51a5cd90 PA |
1705 | pack_long ((gdb_byte *) obstack_base (&data_obstack), |
1706 | long_type, mapping_data.file_count); | |
451b7c33 TT |
1707 | |
1708 | /* Copy the filenames to the data obstack. */ | |
3fba72f7 | 1709 | int size = obstack_object_size (&filename_obstack); |
451b7c33 | 1710 | obstack_grow (&data_obstack, obstack_base (&filename_obstack), |
3fba72f7 | 1711 | size); |
451b7c33 | 1712 | |
4cb1265b MS |
1713 | note_data.reset (elfcore_write_file_note (obfd, note_data.release (), note_size, |
1714 | obstack_base (&data_obstack), | |
1715 | obstack_object_size (&data_obstack))); | |
451b7c33 | 1716 | } |
451b7c33 TT |
1717 | } |
1718 | ||
2989a365 | 1719 | /* Fetch the siginfo data for the specified thread, if it exists. If |
9f584b37 TT |
1720 | there is no data, or we could not read it, return an empty |
1721 | buffer. */ | |
1722 | ||
1723 | static gdb::byte_vector | |
1724 | linux_get_siginfo_data (thread_info *thread, struct gdbarch *gdbarch) | |
9015683b TT |
1725 | { |
1726 | struct type *siginfo_type; | |
9015683b | 1727 | LONGEST bytes_read; |
9015683b TT |
1728 | |
1729 | if (!gdbarch_get_siginfo_type_p (gdbarch)) | |
9f584b37 TT |
1730 | return gdb::byte_vector (); |
1731 | ||
41792d68 PA |
1732 | scoped_restore_current_thread save_current_thread; |
1733 | switch_to_thread (thread); | |
2989a365 | 1734 | |
9015683b TT |
1735 | siginfo_type = gdbarch_get_siginfo_type (gdbarch); |
1736 | ||
9f584b37 | 1737 | gdb::byte_vector buf (TYPE_LENGTH (siginfo_type)); |
9015683b | 1738 | |
328d42d8 SM |
1739 | bytes_read = target_read (current_inferior ()->top_target (), |
1740 | TARGET_OBJECT_SIGNAL_INFO, NULL, | |
9f584b37 TT |
1741 | buf.data (), 0, TYPE_LENGTH (siginfo_type)); |
1742 | if (bytes_read != TYPE_LENGTH (siginfo_type)) | |
1743 | buf.clear (); | |
9015683b TT |
1744 | |
1745 | return buf; | |
1746 | } | |
1747 | ||
6432734d UW |
1748 | struct linux_corefile_thread_data |
1749 | { | |
c21f37a8 SM |
1750 | linux_corefile_thread_data (struct gdbarch *gdbarch, bfd *obfd, |
1751 | gdb::unique_xmalloc_ptr<char> ¬e_data, | |
1752 | int *note_size, gdb_signal stop_signal) | |
1753 | : gdbarch (gdbarch), obfd (obfd), note_data (note_data), | |
1754 | note_size (note_size), stop_signal (stop_signal) | |
1755 | {} | |
1756 | ||
6432734d | 1757 | struct gdbarch *gdbarch; |
6432734d | 1758 | bfd *obfd; |
c21f37a8 | 1759 | gdb::unique_xmalloc_ptr<char> ¬e_data; |
6432734d | 1760 | int *note_size; |
2ea28649 | 1761 | enum gdb_signal stop_signal; |
6432734d UW |
1762 | }; |
1763 | ||
050c224b PA |
1764 | /* Records the thread's register state for the corefile note |
1765 | section. */ | |
6432734d | 1766 | |
050c224b PA |
1767 | static void |
1768 | linux_corefile_thread (struct thread_info *info, | |
1769 | struct linux_corefile_thread_data *args) | |
6432734d | 1770 | { |
f3a5df7b AB |
1771 | gcore_elf_build_thread_register_notes (args->gdbarch, info, |
1772 | args->stop_signal, | |
1773 | args->obfd, &args->note_data, | |
1774 | args->note_size); | |
050c224b PA |
1775 | |
1776 | /* Don't return anything if we got no register information above, | |
1777 | such a core file is useless. */ | |
1778 | if (args->note_data != NULL) | |
c21f37a8 | 1779 | { |
f3a5df7b AB |
1780 | gdb::byte_vector siginfo_data |
1781 | = linux_get_siginfo_data (info, args->gdbarch); | |
c21f37a8 SM |
1782 | if (!siginfo_data.empty ()) |
1783 | args->note_data.reset (elfcore_write_note (args->obfd, | |
1784 | args->note_data.release (), | |
1785 | args->note_size, | |
1786 | "CORE", NT_SIGINFO, | |
1787 | siginfo_data.data (), | |
1788 | siginfo_data.size ())); | |
1789 | } | |
6432734d UW |
1790 | } |
1791 | ||
b3ac9c77 SDJ |
1792 | /* Fill the PRPSINFO structure with information about the process being |
1793 | debugged. Returns 1 in case of success, 0 for failures. Please note that | |
1794 | even if the structure cannot be entirely filled (e.g., GDB was unable to | |
1795 | gather information about the process UID/GID), this function will still | |
1796 | return 1 since some information was already recorded. It will only return | |
1797 | 0 iff nothing can be gathered. */ | |
1798 | ||
1799 | static int | |
1800 | linux_fill_prpsinfo (struct elf_internal_linux_prpsinfo *p) | |
1801 | { | |
1802 | /* The filename which we will use to obtain some info about the process. | |
1803 | We will basically use this to store the `/proc/PID/FILENAME' file. */ | |
1804 | char filename[100]; | |
b3ac9c77 SDJ |
1805 | /* The basename of the executable. */ |
1806 | const char *basename; | |
cbaaa0ca | 1807 | const char *infargs; |
b3ac9c77 SDJ |
1808 | /* Temporary buffer. */ |
1809 | char *tmpstr; | |
1810 | /* The valid states of a process, according to the Linux kernel. */ | |
1811 | const char valid_states[] = "RSDTZW"; | |
1812 | /* The program state. */ | |
1813 | const char *prog_state; | |
1814 | /* The state of the process. */ | |
1815 | char pr_sname; | |
1816 | /* The PID of the program which generated the corefile. */ | |
1817 | pid_t pid; | |
1818 | /* Process flags. */ | |
1819 | unsigned int pr_flag; | |
1820 | /* Process nice value. */ | |
1821 | long pr_nice; | |
1822 | /* The number of fields read by `sscanf'. */ | |
1823 | int n_fields = 0; | |
b3ac9c77 SDJ |
1824 | |
1825 | gdb_assert (p != NULL); | |
1826 | ||
1827 | /* Obtaining PID and filename. */ | |
e99b03dc | 1828 | pid = inferior_ptid.pid (); |
b3ac9c77 | 1829 | xsnprintf (filename, sizeof (filename), "/proc/%d/cmdline", (int) pid); |
87028b87 TT |
1830 | /* The full name of the program which generated the corefile. */ |
1831 | gdb::unique_xmalloc_ptr<char> fname | |
1832 | = target_fileio_read_stralloc (NULL, filename); | |
b3ac9c77 | 1833 | |
87028b87 | 1834 | if (fname == NULL || fname.get ()[0] == '\0') |
b3ac9c77 SDJ |
1835 | { |
1836 | /* No program name was read, so we won't be able to retrieve more | |
1837 | information about the process. */ | |
b3ac9c77 SDJ |
1838 | return 0; |
1839 | } | |
1840 | ||
b3ac9c77 SDJ |
1841 | memset (p, 0, sizeof (*p)); |
1842 | ||
1843 | /* Defining the PID. */ | |
1844 | p->pr_pid = pid; | |
1845 | ||
1846 | /* Copying the program name. Only the basename matters. */ | |
87028b87 | 1847 | basename = lbasename (fname.get ()); |
f67210ff | 1848 | strncpy (p->pr_fname, basename, sizeof (p->pr_fname) - 1); |
b3ac9c77 SDJ |
1849 | p->pr_fname[sizeof (p->pr_fname) - 1] = '\0'; |
1850 | ||
1851 | infargs = get_inferior_args (); | |
1852 | ||
87028b87 TT |
1853 | /* The arguments of the program. */ |
1854 | std::string psargs = fname.get (); | |
b3ac9c77 | 1855 | if (infargs != NULL) |
87028b87 | 1856 | psargs = psargs + " " + infargs; |
b3ac9c77 | 1857 | |
f67210ff | 1858 | strncpy (p->pr_psargs, psargs.c_str (), sizeof (p->pr_psargs) - 1); |
b3ac9c77 SDJ |
1859 | p->pr_psargs[sizeof (p->pr_psargs) - 1] = '\0'; |
1860 | ||
1861 | xsnprintf (filename, sizeof (filename), "/proc/%d/stat", (int) pid); | |
87028b87 TT |
1862 | /* The contents of `/proc/PID/stat'. */ |
1863 | gdb::unique_xmalloc_ptr<char> proc_stat_contents | |
1864 | = target_fileio_read_stralloc (NULL, filename); | |
1865 | char *proc_stat = proc_stat_contents.get (); | |
b3ac9c77 SDJ |
1866 | |
1867 | if (proc_stat == NULL || *proc_stat == '\0') | |
1868 | { | |
1869 | /* Despite being unable to read more information about the | |
1870 | process, we return 1 here because at least we have its | |
1871 | command line, PID and arguments. */ | |
b3ac9c77 SDJ |
1872 | return 1; |
1873 | } | |
1874 | ||
1875 | /* Ok, we have the stats. It's time to do a little parsing of the | |
1876 | contents of the buffer, so that we end up reading what we want. | |
1877 | ||
1878 | The following parsing mechanism is strongly based on the | |
1879 | information generated by the `fs/proc/array.c' file, present in | |
1880 | the Linux kernel tree. More details about how the information is | |
1881 | displayed can be obtained by seeing the manpage of proc(5), | |
1882 | specifically under the entry of `/proc/[pid]/stat'. */ | |
1883 | ||
1884 | /* Getting rid of the PID, since we already have it. */ | |
1885 | while (isdigit (*proc_stat)) | |
1886 | ++proc_stat; | |
1887 | ||
1888 | proc_stat = skip_spaces (proc_stat); | |
1889 | ||
184cd072 JK |
1890 | /* ps command also relies on no trailing fields ever contain ')'. */ |
1891 | proc_stat = strrchr (proc_stat, ')'); | |
1892 | if (proc_stat == NULL) | |
87028b87 | 1893 | return 1; |
184cd072 | 1894 | proc_stat++; |
b3ac9c77 SDJ |
1895 | |
1896 | proc_stat = skip_spaces (proc_stat); | |
1897 | ||
1898 | n_fields = sscanf (proc_stat, | |
1899 | "%c" /* Process state. */ | |
1900 | "%d%d%d" /* Parent PID, group ID, session ID. */ | |
1901 | "%*d%*d" /* tty_nr, tpgid (not used). */ | |
1902 | "%u" /* Flags. */ | |
1903 | "%*s%*s%*s%*s" /* minflt, cminflt, majflt, | |
1904 | cmajflt (not used). */ | |
1905 | "%*s%*s%*s%*s" /* utime, stime, cutime, | |
1906 | cstime (not used). */ | |
1907 | "%*s" /* Priority (not used). */ | |
1908 | "%ld", /* Nice. */ | |
1909 | &pr_sname, | |
1910 | &p->pr_ppid, &p->pr_pgrp, &p->pr_sid, | |
1911 | &pr_flag, | |
1912 | &pr_nice); | |
1913 | ||
1914 | if (n_fields != 6) | |
1915 | { | |
1916 | /* Again, we couldn't read the complementary information about | |
1917 | the process state. However, we already have minimal | |
1918 | information, so we just return 1 here. */ | |
b3ac9c77 SDJ |
1919 | return 1; |
1920 | } | |
1921 | ||
1922 | /* Filling the structure fields. */ | |
1923 | prog_state = strchr (valid_states, pr_sname); | |
1924 | if (prog_state != NULL) | |
1925 | p->pr_state = prog_state - valid_states; | |
1926 | else | |
1927 | { | |
1928 | /* Zero means "Running". */ | |
1929 | p->pr_state = 0; | |
1930 | } | |
1931 | ||
1932 | p->pr_sname = p->pr_state > 5 ? '.' : pr_sname; | |
1933 | p->pr_zomb = p->pr_sname == 'Z'; | |
1934 | p->pr_nice = pr_nice; | |
1935 | p->pr_flag = pr_flag; | |
1936 | ||
1937 | /* Finally, obtaining the UID and GID. For that, we read and parse the | |
1938 | contents of the `/proc/PID/status' file. */ | |
1939 | xsnprintf (filename, sizeof (filename), "/proc/%d/status", (int) pid); | |
87028b87 TT |
1940 | /* The contents of `/proc/PID/status'. */ |
1941 | gdb::unique_xmalloc_ptr<char> proc_status_contents | |
1942 | = target_fileio_read_stralloc (NULL, filename); | |
1943 | char *proc_status = proc_status_contents.get (); | |
b3ac9c77 SDJ |
1944 | |
1945 | if (proc_status == NULL || *proc_status == '\0') | |
1946 | { | |
1947 | /* Returning 1 since we already have a bunch of information. */ | |
b3ac9c77 SDJ |
1948 | return 1; |
1949 | } | |
1950 | ||
1951 | /* Extracting the UID. */ | |
1952 | tmpstr = strstr (proc_status, "Uid:"); | |
1953 | if (tmpstr != NULL) | |
1954 | { | |
1955 | /* Advancing the pointer to the beginning of the UID. */ | |
1956 | tmpstr += sizeof ("Uid:"); | |
1957 | while (*tmpstr != '\0' && !isdigit (*tmpstr)) | |
1958 | ++tmpstr; | |
1959 | ||
1960 | if (isdigit (*tmpstr)) | |
1961 | p->pr_uid = strtol (tmpstr, &tmpstr, 10); | |
1962 | } | |
1963 | ||
1964 | /* Extracting the GID. */ | |
1965 | tmpstr = strstr (proc_status, "Gid:"); | |
1966 | if (tmpstr != NULL) | |
1967 | { | |
1968 | /* Advancing the pointer to the beginning of the GID. */ | |
1969 | tmpstr += sizeof ("Gid:"); | |
1970 | while (*tmpstr != '\0' && !isdigit (*tmpstr)) | |
1971 | ++tmpstr; | |
1972 | ||
1973 | if (isdigit (*tmpstr)) | |
1974 | p->pr_gid = strtol (tmpstr, &tmpstr, 10); | |
1975 | } | |
1976 | ||
b3ac9c77 SDJ |
1977 | return 1; |
1978 | } | |
1979 | ||
f968fe80 AA |
1980 | /* Build the note section for a corefile, and return it in a malloc |
1981 | buffer. */ | |
6432734d | 1982 | |
c21f37a8 | 1983 | static gdb::unique_xmalloc_ptr<char> |
f968fe80 | 1984 | linux_make_corefile_notes (struct gdbarch *gdbarch, bfd *obfd, int *note_size) |
6432734d | 1985 | { |
b3ac9c77 | 1986 | struct elf_internal_linux_prpsinfo prpsinfo; |
c21f37a8 | 1987 | gdb::unique_xmalloc_ptr<char> note_data; |
6432734d | 1988 | |
f968fe80 AA |
1989 | if (! gdbarch_iterate_over_regset_sections_p (gdbarch)) |
1990 | return NULL; | |
1991 | ||
b3ac9c77 | 1992 | if (linux_fill_prpsinfo (&prpsinfo)) |
6432734d | 1993 | { |
fe220226 | 1994 | if (gdbarch_ptr_bit (gdbarch) == 64) |
c21f37a8 SM |
1995 | note_data.reset (elfcore_write_linux_prpsinfo64 (obfd, |
1996 | note_data.release (), | |
1997 | note_size, &prpsinfo)); | |
b3ac9c77 | 1998 | else |
c21f37a8 SM |
1999 | note_data.reset (elfcore_write_linux_prpsinfo32 (obfd, |
2000 | note_data.release (), | |
2001 | note_size, &prpsinfo)); | |
6432734d UW |
2002 | } |
2003 | ||
2004 | /* Thread register information. */ | |
a70b8144 | 2005 | try |
22fd09ae JK |
2006 | { |
2007 | update_thread_list (); | |
2008 | } | |
230d2906 | 2009 | catch (const gdb_exception_error &e) |
492d29ea PA |
2010 | { |
2011 | exception_print (gdb_stderr, e); | |
2012 | } | |
492d29ea | 2013 | |
050c224b | 2014 | /* Like the kernel, prefer dumping the signalled thread first. |
8df01799 PA |
2015 | "First thread" is what tools use to infer the signalled |
2016 | thread. */ | |
f3a5df7b | 2017 | thread_info *signalled_thr = gcore_find_signalled_thread (); |
c21f37a8 | 2018 | gdb_signal stop_signal; |
8df01799 | 2019 | if (signalled_thr != nullptr) |
c21f37a8 | 2020 | stop_signal = signalled_thr->suspend.stop_signal; |
8df01799 | 2021 | else |
c21f37a8 SM |
2022 | stop_signal = GDB_SIGNAL_0; |
2023 | ||
2024 | linux_corefile_thread_data thread_args (gdbarch, obfd, note_data, note_size, | |
2025 | stop_signal); | |
050c224b | 2026 | |
8df01799 PA |
2027 | if (signalled_thr != nullptr) |
2028 | linux_corefile_thread (signalled_thr, &thread_args); | |
08036331 | 2029 | for (thread_info *thr : current_inferior ()->non_exited_threads ()) |
050c224b PA |
2030 | { |
2031 | if (thr == signalled_thr) | |
2032 | continue; | |
050c224b PA |
2033 | |
2034 | linux_corefile_thread (thr, &thread_args); | |
2035 | } | |
2036 | ||
6432734d UW |
2037 | if (!note_data) |
2038 | return NULL; | |
2039 | ||
2040 | /* Auxillary vector. */ | |
9018be22 | 2041 | gdb::optional<gdb::byte_vector> auxv = |
328d42d8 SM |
2042 | target_read_alloc (current_inferior ()->top_target (), |
2043 | TARGET_OBJECT_AUXV, NULL); | |
9018be22 | 2044 | if (auxv && !auxv->empty ()) |
6432734d | 2045 | { |
c21f37a8 SM |
2046 | note_data.reset (elfcore_write_note (obfd, note_data.release (), |
2047 | note_size, "CORE", NT_AUXV, | |
2048 | auxv->data (), auxv->size ())); | |
6432734d UW |
2049 | |
2050 | if (!note_data) | |
2051 | return NULL; | |
2052 | } | |
2053 | ||
451b7c33 | 2054 | /* File mappings. */ |
c21f37a8 | 2055 | linux_make_mappings_corefile_notes (gdbarch, obfd, note_data, note_size); |
451b7c33 | 2056 | |
95ce627a AB |
2057 | /* Target description. */ |
2058 | gcore_elf_make_tdesc_note (obfd, ¬e_data, note_size); | |
2059 | ||
6432734d UW |
2060 | return note_data; |
2061 | } | |
2062 | ||
eb14d406 SDJ |
2063 | /* Implementation of `gdbarch_gdb_signal_from_target', as defined in |
2064 | gdbarch.h. This function is not static because it is exported to | |
2065 | other -tdep files. */ | |
2066 | ||
2067 | enum gdb_signal | |
2068 | linux_gdb_signal_from_target (struct gdbarch *gdbarch, int signal) | |
2069 | { | |
2070 | switch (signal) | |
2071 | { | |
2072 | case 0: | |
2073 | return GDB_SIGNAL_0; | |
2074 | ||
2075 | case LINUX_SIGHUP: | |
2076 | return GDB_SIGNAL_HUP; | |
2077 | ||
2078 | case LINUX_SIGINT: | |
2079 | return GDB_SIGNAL_INT; | |
2080 | ||
2081 | case LINUX_SIGQUIT: | |
2082 | return GDB_SIGNAL_QUIT; | |
2083 | ||
2084 | case LINUX_SIGILL: | |
2085 | return GDB_SIGNAL_ILL; | |
2086 | ||
2087 | case LINUX_SIGTRAP: | |
2088 | return GDB_SIGNAL_TRAP; | |
2089 | ||
2090 | case LINUX_SIGABRT: | |
2091 | return GDB_SIGNAL_ABRT; | |
2092 | ||
2093 | case LINUX_SIGBUS: | |
2094 | return GDB_SIGNAL_BUS; | |
2095 | ||
2096 | case LINUX_SIGFPE: | |
2097 | return GDB_SIGNAL_FPE; | |
2098 | ||
2099 | case LINUX_SIGKILL: | |
2100 | return GDB_SIGNAL_KILL; | |
2101 | ||
2102 | case LINUX_SIGUSR1: | |
2103 | return GDB_SIGNAL_USR1; | |
2104 | ||
2105 | case LINUX_SIGSEGV: | |
2106 | return GDB_SIGNAL_SEGV; | |
2107 | ||
2108 | case LINUX_SIGUSR2: | |
2109 | return GDB_SIGNAL_USR2; | |
2110 | ||
2111 | case LINUX_SIGPIPE: | |
2112 | return GDB_SIGNAL_PIPE; | |
2113 | ||
2114 | case LINUX_SIGALRM: | |
2115 | return GDB_SIGNAL_ALRM; | |
2116 | ||
2117 | case LINUX_SIGTERM: | |
2118 | return GDB_SIGNAL_TERM; | |
2119 | ||
2120 | case LINUX_SIGCHLD: | |
2121 | return GDB_SIGNAL_CHLD; | |
2122 | ||
2123 | case LINUX_SIGCONT: | |
2124 | return GDB_SIGNAL_CONT; | |
2125 | ||
2126 | case LINUX_SIGSTOP: | |
2127 | return GDB_SIGNAL_STOP; | |
2128 | ||
2129 | case LINUX_SIGTSTP: | |
2130 | return GDB_SIGNAL_TSTP; | |
2131 | ||
2132 | case LINUX_SIGTTIN: | |
2133 | return GDB_SIGNAL_TTIN; | |
2134 | ||
2135 | case LINUX_SIGTTOU: | |
2136 | return GDB_SIGNAL_TTOU; | |
2137 | ||
2138 | case LINUX_SIGURG: | |
2139 | return GDB_SIGNAL_URG; | |
2140 | ||
2141 | case LINUX_SIGXCPU: | |
2142 | return GDB_SIGNAL_XCPU; | |
2143 | ||
2144 | case LINUX_SIGXFSZ: | |
2145 | return GDB_SIGNAL_XFSZ; | |
2146 | ||
2147 | case LINUX_SIGVTALRM: | |
2148 | return GDB_SIGNAL_VTALRM; | |
2149 | ||
2150 | case LINUX_SIGPROF: | |
2151 | return GDB_SIGNAL_PROF; | |
2152 | ||
2153 | case LINUX_SIGWINCH: | |
2154 | return GDB_SIGNAL_WINCH; | |
2155 | ||
2156 | /* No way to differentiate between SIGIO and SIGPOLL. | |
2157 | Therefore, we just handle the first one. */ | |
2158 | case LINUX_SIGIO: | |
2159 | return GDB_SIGNAL_IO; | |
2160 | ||
2161 | case LINUX_SIGPWR: | |
2162 | return GDB_SIGNAL_PWR; | |
2163 | ||
2164 | case LINUX_SIGSYS: | |
2165 | return GDB_SIGNAL_SYS; | |
2166 | ||
2167 | /* SIGRTMIN and SIGRTMAX are not continuous in <gdb/signals.def>, | |
2168 | therefore we have to handle them here. */ | |
2169 | case LINUX_SIGRTMIN: | |
2170 | return GDB_SIGNAL_REALTIME_32; | |
2171 | ||
2172 | case LINUX_SIGRTMAX: | |
2173 | return GDB_SIGNAL_REALTIME_64; | |
2174 | } | |
2175 | ||
2176 | if (signal >= LINUX_SIGRTMIN + 1 && signal <= LINUX_SIGRTMAX - 1) | |
2177 | { | |
2178 | int offset = signal - LINUX_SIGRTMIN + 1; | |
2179 | ||
2180 | return (enum gdb_signal) ((int) GDB_SIGNAL_REALTIME_33 + offset); | |
2181 | } | |
2182 | ||
2183 | return GDB_SIGNAL_UNKNOWN; | |
2184 | } | |
2185 | ||
2186 | /* Implementation of `gdbarch_gdb_signal_to_target', as defined in | |
2187 | gdbarch.h. This function is not static because it is exported to | |
2188 | other -tdep files. */ | |
2189 | ||
2190 | int | |
2191 | linux_gdb_signal_to_target (struct gdbarch *gdbarch, | |
2192 | enum gdb_signal signal) | |
2193 | { | |
2194 | switch (signal) | |
2195 | { | |
2196 | case GDB_SIGNAL_0: | |
2197 | return 0; | |
2198 | ||
2199 | case GDB_SIGNAL_HUP: | |
2200 | return LINUX_SIGHUP; | |
2201 | ||
2202 | case GDB_SIGNAL_INT: | |
2203 | return LINUX_SIGINT; | |
2204 | ||
2205 | case GDB_SIGNAL_QUIT: | |
2206 | return LINUX_SIGQUIT; | |
2207 | ||
2208 | case GDB_SIGNAL_ILL: | |
2209 | return LINUX_SIGILL; | |
2210 | ||
2211 | case GDB_SIGNAL_TRAP: | |
2212 | return LINUX_SIGTRAP; | |
2213 | ||
2214 | case GDB_SIGNAL_ABRT: | |
2215 | return LINUX_SIGABRT; | |
2216 | ||
2217 | case GDB_SIGNAL_FPE: | |
2218 | return LINUX_SIGFPE; | |
2219 | ||
2220 | case GDB_SIGNAL_KILL: | |
2221 | return LINUX_SIGKILL; | |
2222 | ||
2223 | case GDB_SIGNAL_BUS: | |
2224 | return LINUX_SIGBUS; | |
2225 | ||
2226 | case GDB_SIGNAL_SEGV: | |
2227 | return LINUX_SIGSEGV; | |
2228 | ||
2229 | case GDB_SIGNAL_SYS: | |
2230 | return LINUX_SIGSYS; | |
2231 | ||
2232 | case GDB_SIGNAL_PIPE: | |
2233 | return LINUX_SIGPIPE; | |
2234 | ||
2235 | case GDB_SIGNAL_ALRM: | |
2236 | return LINUX_SIGALRM; | |
2237 | ||
2238 | case GDB_SIGNAL_TERM: | |
2239 | return LINUX_SIGTERM; | |
2240 | ||
2241 | case GDB_SIGNAL_URG: | |
2242 | return LINUX_SIGURG; | |
2243 | ||
2244 | case GDB_SIGNAL_STOP: | |
2245 | return LINUX_SIGSTOP; | |
2246 | ||
2247 | case GDB_SIGNAL_TSTP: | |
2248 | return LINUX_SIGTSTP; | |
2249 | ||
2250 | case GDB_SIGNAL_CONT: | |
2251 | return LINUX_SIGCONT; | |
2252 | ||
2253 | case GDB_SIGNAL_CHLD: | |
2254 | return LINUX_SIGCHLD; | |
2255 | ||
2256 | case GDB_SIGNAL_TTIN: | |
2257 | return LINUX_SIGTTIN; | |
2258 | ||
2259 | case GDB_SIGNAL_TTOU: | |
2260 | return LINUX_SIGTTOU; | |
2261 | ||
2262 | case GDB_SIGNAL_IO: | |
2263 | return LINUX_SIGIO; | |
2264 | ||
2265 | case GDB_SIGNAL_XCPU: | |
2266 | return LINUX_SIGXCPU; | |
2267 | ||
2268 | case GDB_SIGNAL_XFSZ: | |
2269 | return LINUX_SIGXFSZ; | |
2270 | ||
2271 | case GDB_SIGNAL_VTALRM: | |
2272 | return LINUX_SIGVTALRM; | |
2273 | ||
2274 | case GDB_SIGNAL_PROF: | |
2275 | return LINUX_SIGPROF; | |
2276 | ||
2277 | case GDB_SIGNAL_WINCH: | |
2278 | return LINUX_SIGWINCH; | |
2279 | ||
2280 | case GDB_SIGNAL_USR1: | |
2281 | return LINUX_SIGUSR1; | |
2282 | ||
2283 | case GDB_SIGNAL_USR2: | |
2284 | return LINUX_SIGUSR2; | |
2285 | ||
2286 | case GDB_SIGNAL_PWR: | |
2287 | return LINUX_SIGPWR; | |
2288 | ||
2289 | case GDB_SIGNAL_POLL: | |
2290 | return LINUX_SIGPOLL; | |
2291 | ||
2292 | /* GDB_SIGNAL_REALTIME_32 is not continuous in <gdb/signals.def>, | |
2293 | therefore we have to handle it here. */ | |
2294 | case GDB_SIGNAL_REALTIME_32: | |
2295 | return LINUX_SIGRTMIN; | |
2296 | ||
2297 | /* Same comment applies to _64. */ | |
2298 | case GDB_SIGNAL_REALTIME_64: | |
2299 | return LINUX_SIGRTMAX; | |
2300 | } | |
2301 | ||
2302 | /* GDB_SIGNAL_REALTIME_33 to _64 are continuous. */ | |
2303 | if (signal >= GDB_SIGNAL_REALTIME_33 | |
2304 | && signal <= GDB_SIGNAL_REALTIME_63) | |
2305 | { | |
2306 | int offset = signal - GDB_SIGNAL_REALTIME_33; | |
2307 | ||
2308 | return LINUX_SIGRTMIN + 1 + offset; | |
2309 | } | |
2310 | ||
2311 | return -1; | |
2312 | } | |
2313 | ||
cdfa0b0a PA |
2314 | /* Helper for linux_vsyscall_range that does the real work of finding |
2315 | the vsyscall's address range. */ | |
3437254d PA |
2316 | |
2317 | static int | |
cdfa0b0a | 2318 | linux_vsyscall_range_raw (struct gdbarch *gdbarch, struct mem_range *range) |
3437254d | 2319 | { |
95e94c3f PA |
2320 | char filename[100]; |
2321 | long pid; | |
95e94c3f | 2322 | |
328d42d8 SM |
2323 | if (target_auxv_search (current_inferior ()->top_target (), |
2324 | AT_SYSINFO_EHDR, &range->start) <= 0) | |
95e94c3f PA |
2325 | return 0; |
2326 | ||
6bb90213 PA |
2327 | /* It doesn't make sense to access the host's /proc when debugging a |
2328 | core file. Instead, look for the PT_LOAD segment that matches | |
2329 | the vDSO. */ | |
55f6301a | 2330 | if (!target_has_execution ()) |
6bb90213 | 2331 | { |
6bb90213 PA |
2332 | long phdrs_size; |
2333 | int num_phdrs, i; | |
2334 | ||
2335 | phdrs_size = bfd_get_elf_phdr_upper_bound (core_bfd); | |
2336 | if (phdrs_size == -1) | |
2337 | return 0; | |
2338 | ||
31aceee8 TV |
2339 | gdb::unique_xmalloc_ptr<Elf_Internal_Phdr> |
2340 | phdrs ((Elf_Internal_Phdr *) xmalloc (phdrs_size)); | |
2341 | num_phdrs = bfd_get_elf_phdrs (core_bfd, phdrs.get ()); | |
6bb90213 PA |
2342 | if (num_phdrs == -1) |
2343 | return 0; | |
2344 | ||
2345 | for (i = 0; i < num_phdrs; i++) | |
31aceee8 TV |
2346 | if (phdrs.get ()[i].p_type == PT_LOAD |
2347 | && phdrs.get ()[i].p_vaddr == range->start) | |
6bb90213 | 2348 | { |
31aceee8 | 2349 | range->length = phdrs.get ()[i].p_memsz; |
6bb90213 PA |
2350 | return 1; |
2351 | } | |
2352 | ||
2353 | return 0; | |
2354 | } | |
2355 | ||
95e94c3f PA |
2356 | /* We need to know the real target PID to access /proc. */ |
2357 | if (current_inferior ()->fake_pid_p) | |
2358 | return 0; | |
2359 | ||
95e94c3f | 2360 | pid = current_inferior ()->pid; |
3437254d | 2361 | |
95e94c3f PA |
2362 | /* Note that reading /proc/PID/task/PID/maps (1) is much faster than |
2363 | reading /proc/PID/maps (2). The later identifies thread stacks | |
2364 | in the output, which requires scanning every thread in the thread | |
2365 | group to check whether a VMA is actually a thread's stack. With | |
2366 | Linux 4.4 on an Intel i7-4810MQ @ 2.80GHz, with an inferior with | |
2367 | a few thousand threads, (1) takes a few miliseconds, while (2) | |
2368 | takes several seconds. Also note that "smaps", what we read for | |
2369 | determining core dump mappings, is even slower than "maps". */ | |
2370 | xsnprintf (filename, sizeof filename, "/proc/%ld/task/%ld/maps", pid, pid); | |
87028b87 TT |
2371 | gdb::unique_xmalloc_ptr<char> data |
2372 | = target_fileio_read_stralloc (NULL, filename); | |
95e94c3f PA |
2373 | if (data != NULL) |
2374 | { | |
95e94c3f PA |
2375 | char *line; |
2376 | char *saveptr = NULL; | |
2377 | ||
87028b87 | 2378 | for (line = strtok_r (data.get (), "\n", &saveptr); |
95e94c3f PA |
2379 | line != NULL; |
2380 | line = strtok_r (NULL, "\n", &saveptr)) | |
2381 | { | |
2382 | ULONGEST addr, endaddr; | |
2383 | const char *p = line; | |
2384 | ||
2385 | addr = strtoulst (p, &p, 16); | |
2386 | if (addr == range->start) | |
2387 | { | |
2388 | if (*p == '-') | |
2389 | p++; | |
2390 | endaddr = strtoulst (p, &p, 16); | |
2391 | range->length = endaddr - addr; | |
95e94c3f PA |
2392 | return 1; |
2393 | } | |
2394 | } | |
95e94c3f PA |
2395 | } |
2396 | else | |
2397 | warning (_("unable to open /proc file '%s'"), filename); | |
2398 | ||
2399 | return 0; | |
3437254d PA |
2400 | } |
2401 | ||
cdfa0b0a PA |
2402 | /* Implementation of the "vsyscall_range" gdbarch hook. Handles |
2403 | caching, and defers the real work to linux_vsyscall_range_raw. */ | |
2404 | ||
2405 | static int | |
2406 | linux_vsyscall_range (struct gdbarch *gdbarch, struct mem_range *range) | |
2407 | { | |
94b24c74 | 2408 | struct linux_info *info = get_linux_inferior_data (current_inferior ()); |
cdfa0b0a PA |
2409 | |
2410 | if (info->vsyscall_range_p == 0) | |
2411 | { | |
2412 | if (linux_vsyscall_range_raw (gdbarch, &info->vsyscall_range)) | |
2413 | info->vsyscall_range_p = 1; | |
2414 | else | |
2415 | info->vsyscall_range_p = -1; | |
2416 | } | |
2417 | ||
2418 | if (info->vsyscall_range_p < 0) | |
2419 | return 0; | |
2420 | ||
2421 | *range = info->vsyscall_range; | |
2422 | return 1; | |
2423 | } | |
2424 | ||
3bc3cebe JK |
2425 | /* Symbols for linux_infcall_mmap's ARG_FLAGS; their Linux MAP_* system |
2426 | definitions would be dependent on compilation host. */ | |
2427 | #define GDB_MMAP_MAP_PRIVATE 0x02 /* Changes are private. */ | |
2428 | #define GDB_MMAP_MAP_ANONYMOUS 0x20 /* Don't use a file. */ | |
2429 | ||
2430 | /* See gdbarch.sh 'infcall_mmap'. */ | |
2431 | ||
2432 | static CORE_ADDR | |
2433 | linux_infcall_mmap (CORE_ADDR size, unsigned prot) | |
2434 | { | |
2435 | struct objfile *objf; | |
2436 | /* Do there still exist any Linux systems without "mmap64"? | |
2437 | "mmap" uses 64-bit off_t on x86_64 and 32-bit off_t on i386 and x32. */ | |
2438 | struct value *mmap_val = find_function_in_inferior ("mmap64", &objf); | |
2439 | struct value *addr_val; | |
08feed99 | 2440 | struct gdbarch *gdbarch = objf->arch (); |
3bc3cebe JK |
2441 | CORE_ADDR retval; |
2442 | enum | |
2443 | { | |
2a546367 | 2444 | ARG_ADDR, ARG_LENGTH, ARG_PROT, ARG_FLAGS, ARG_FD, ARG_OFFSET, ARG_LAST |
3bc3cebe | 2445 | }; |
2a546367 | 2446 | struct value *arg[ARG_LAST]; |
3bc3cebe JK |
2447 | |
2448 | arg[ARG_ADDR] = value_from_pointer (builtin_type (gdbarch)->builtin_data_ptr, | |
2449 | 0); | |
2450 | /* Assuming sizeof (unsigned long) == sizeof (size_t). */ | |
2451 | arg[ARG_LENGTH] = value_from_ulongest | |
2452 | (builtin_type (gdbarch)->builtin_unsigned_long, size); | |
2453 | gdb_assert ((prot & ~(GDB_MMAP_PROT_READ | GDB_MMAP_PROT_WRITE | |
2454 | | GDB_MMAP_PROT_EXEC)) | |
2455 | == 0); | |
2456 | arg[ARG_PROT] = value_from_longest (builtin_type (gdbarch)->builtin_int, prot); | |
2457 | arg[ARG_FLAGS] = value_from_longest (builtin_type (gdbarch)->builtin_int, | |
2458 | GDB_MMAP_MAP_PRIVATE | |
2459 | | GDB_MMAP_MAP_ANONYMOUS); | |
2460 | arg[ARG_FD] = value_from_longest (builtin_type (gdbarch)->builtin_int, -1); | |
2461 | arg[ARG_OFFSET] = value_from_longest (builtin_type (gdbarch)->builtin_int64, | |
2462 | 0); | |
e71585ff | 2463 | addr_val = call_function_by_hand (mmap_val, NULL, arg); |
3bc3cebe JK |
2464 | retval = value_as_address (addr_val); |
2465 | if (retval == (CORE_ADDR) -1) | |
2466 | error (_("Failed inferior mmap call for %s bytes, errno is changed."), | |
2467 | pulongest (size)); | |
2468 | return retval; | |
2469 | } | |
2470 | ||
7f361056 JK |
2471 | /* See gdbarch.sh 'infcall_munmap'. */ |
2472 | ||
2473 | static void | |
2474 | linux_infcall_munmap (CORE_ADDR addr, CORE_ADDR size) | |
2475 | { | |
2476 | struct objfile *objf; | |
2477 | struct value *munmap_val = find_function_in_inferior ("munmap", &objf); | |
2478 | struct value *retval_val; | |
08feed99 | 2479 | struct gdbarch *gdbarch = objf->arch (); |
7f361056 JK |
2480 | LONGEST retval; |
2481 | enum | |
2482 | { | |
2483 | ARG_ADDR, ARG_LENGTH, ARG_LAST | |
2484 | }; | |
2485 | struct value *arg[ARG_LAST]; | |
2486 | ||
2487 | arg[ARG_ADDR] = value_from_pointer (builtin_type (gdbarch)->builtin_data_ptr, | |
2488 | addr); | |
2489 | /* Assuming sizeof (unsigned long) == sizeof (size_t). */ | |
2490 | arg[ARG_LENGTH] = value_from_ulongest | |
2491 | (builtin_type (gdbarch)->builtin_unsigned_long, size); | |
e71585ff | 2492 | retval_val = call_function_by_hand (munmap_val, NULL, arg); |
7f361056 JK |
2493 | retval = value_as_long (retval_val); |
2494 | if (retval != 0) | |
2495 | warning (_("Failed inferior munmap call at %s for %s bytes, " | |
2496 | "errno is changed."), | |
2497 | hex_string (addr), pulongest (size)); | |
2498 | } | |
2499 | ||
906d60cf PA |
2500 | /* See linux-tdep.h. */ |
2501 | ||
2502 | CORE_ADDR | |
2503 | linux_displaced_step_location (struct gdbarch *gdbarch) | |
2504 | { | |
2505 | CORE_ADDR addr; | |
2506 | int bp_len; | |
2507 | ||
2508 | /* Determine entry point from target auxiliary vector. This avoids | |
2509 | the need for symbols. Also, when debugging a stand-alone SPU | |
2510 | executable, entry_point_address () will point to an SPU | |
2511 | local-store address and is thus not usable as displaced stepping | |
2512 | location. The auxiliary vector gets us the PowerPC-side entry | |
2513 | point address instead. */ | |
328d42d8 SM |
2514 | if (target_auxv_search (current_inferior ()->top_target (), |
2515 | AT_ENTRY, &addr) <= 0) | |
16b41842 PA |
2516 | throw_error (NOT_SUPPORTED_ERROR, |
2517 | _("Cannot find AT_ENTRY auxiliary vector entry.")); | |
906d60cf PA |
2518 | |
2519 | /* Make certain that the address points at real code, and not a | |
2520 | function descriptor. */ | |
328d42d8 SM |
2521 | addr = gdbarch_convert_from_func_ptr_addr |
2522 | (gdbarch, addr, current_inferior ()->top_target ()); | |
906d60cf PA |
2523 | |
2524 | /* Inferior calls also use the entry point as a breakpoint location. | |
2525 | We don't want displaced stepping to interfere with those | |
2526 | breakpoints, so leave space. */ | |
2527 | gdbarch_breakpoint_from_pc (gdbarch, &addr, &bp_len); | |
2528 | addr += bp_len * 2; | |
2529 | ||
2530 | return addr; | |
2531 | } | |
2532 | ||
0f83012e AH |
2533 | /* See linux-tdep.h. */ |
2534 | ||
187b041e SM |
2535 | displaced_step_prepare_status |
2536 | linux_displaced_step_prepare (gdbarch *arch, thread_info *thread, | |
2537 | CORE_ADDR &displaced_pc) | |
2538 | { | |
2539 | linux_info *per_inferior = get_linux_inferior_data (thread->inf); | |
2540 | ||
480af54c | 2541 | if (!per_inferior->disp_step_bufs.has_value ()) |
187b041e | 2542 | { |
480af54c SM |
2543 | /* Figure out the location of the buffers. They are contiguous, starting |
2544 | at DISP_STEP_BUF_ADDR. They are all of size BUF_LEN. */ | |
187b041e SM |
2545 | CORE_ADDR disp_step_buf_addr |
2546 | = linux_displaced_step_location (thread->inf->gdbarch); | |
480af54c | 2547 | int buf_len = gdbarch_max_insn_length (arch); |
187b041e | 2548 | |
480af54c SM |
2549 | linux_gdbarch_data *gdbarch_data = get_linux_gdbarch_data (arch); |
2550 | gdb_assert (gdbarch_data->num_disp_step_buffers > 0); | |
2551 | ||
2552 | std::vector<CORE_ADDR> buffers; | |
2553 | for (int i = 0; i < gdbarch_data->num_disp_step_buffers; i++) | |
2554 | buffers.push_back (disp_step_buf_addr + i * buf_len); | |
2555 | ||
2556 | per_inferior->disp_step_bufs.emplace (buffers); | |
187b041e SM |
2557 | } |
2558 | ||
480af54c | 2559 | return per_inferior->disp_step_bufs->prepare (thread, displaced_pc); |
187b041e SM |
2560 | } |
2561 | ||
2562 | /* See linux-tdep.h. */ | |
2563 | ||
2564 | displaced_step_finish_status | |
2565 | linux_displaced_step_finish (gdbarch *arch, thread_info *thread, gdb_signal sig) | |
2566 | { | |
2567 | linux_info *per_inferior = get_linux_inferior_data (thread->inf); | |
2568 | ||
480af54c | 2569 | gdb_assert (per_inferior->disp_step_bufs.has_value ()); |
187b041e | 2570 | |
480af54c | 2571 | return per_inferior->disp_step_bufs->finish (arch, thread, sig); |
187b041e SM |
2572 | } |
2573 | ||
2574 | /* See linux-tdep.h. */ | |
2575 | ||
2576 | const displaced_step_copy_insn_closure * | |
2577 | linux_displaced_step_copy_insn_closure_by_addr (inferior *inf, CORE_ADDR addr) | |
2578 | { | |
2579 | linux_info *per_inferior = linux_inferior_data.get (inf); | |
2580 | ||
2581 | if (per_inferior == nullptr | |
480af54c | 2582 | || !per_inferior->disp_step_bufs.has_value ()) |
187b041e SM |
2583 | return nullptr; |
2584 | ||
480af54c | 2585 | return per_inferior->disp_step_bufs->copy_insn_closure_by_addr (addr); |
187b041e SM |
2586 | } |
2587 | ||
2588 | /* See linux-tdep.h. */ | |
2589 | ||
2590 | void | |
2591 | linux_displaced_step_restore_all_in_ptid (inferior *parent_inf, ptid_t ptid) | |
2592 | { | |
2593 | linux_info *per_inferior = linux_inferior_data.get (parent_inf); | |
2594 | ||
2595 | if (per_inferior == nullptr | |
480af54c | 2596 | || !per_inferior->disp_step_bufs.has_value ()) |
187b041e SM |
2597 | return; |
2598 | ||
480af54c | 2599 | per_inferior->disp_step_bufs->restore_in_ptid (ptid); |
187b041e SM |
2600 | } |
2601 | ||
2602 | /* See linux-tdep.h. */ | |
2603 | ||
0f83012e AH |
2604 | CORE_ADDR |
2605 | linux_get_hwcap (struct target_ops *target) | |
2606 | { | |
2607 | CORE_ADDR field; | |
2608 | if (target_auxv_search (target, AT_HWCAP, &field) != 1) | |
2609 | return 0; | |
2610 | return field; | |
2611 | } | |
2612 | ||
2613 | /* See linux-tdep.h. */ | |
2614 | ||
2615 | CORE_ADDR | |
2616 | linux_get_hwcap2 (struct target_ops *target) | |
2617 | { | |
2618 | CORE_ADDR field; | |
2619 | if (target_auxv_search (target, AT_HWCAP2, &field) != 1) | |
2620 | return 0; | |
2621 | return field; | |
2622 | } | |
2623 | ||
df8411da SDJ |
2624 | /* Display whether the gcore command is using the |
2625 | /proc/PID/coredump_filter file. */ | |
2626 | ||
2627 | static void | |
2628 | show_use_coredump_filter (struct ui_file *file, int from_tty, | |
2629 | struct cmd_list_element *c, const char *value) | |
2630 | { | |
2631 | fprintf_filtered (file, _("Use of /proc/PID/coredump_filter file to generate" | |
2632 | " corefiles is %s.\n"), value); | |
2633 | } | |
2634 | ||
afa840dc SL |
2635 | /* Display whether the gcore command is dumping mappings marked with |
2636 | the VM_DONTDUMP flag. */ | |
2637 | ||
2638 | static void | |
2639 | show_dump_excluded_mappings (struct ui_file *file, int from_tty, | |
2640 | struct cmd_list_element *c, const char *value) | |
2641 | { | |
2642 | fprintf_filtered (file, _("Dumping of mappings marked with the VM_DONTDUMP" | |
2643 | " flag is %s.\n"), value); | |
2644 | } | |
2645 | ||
a5ee0f0c | 2646 | /* To be called from the various GDB_OSABI_LINUX handlers for the |
480af54c SM |
2647 | various GNU/Linux architectures and machine types. |
2648 | ||
2649 | NUM_DISP_STEP_BUFFERS is the number of displaced step buffers to use. If 0, | |
2650 | displaced stepping is not supported. */ | |
a5ee0f0c PA |
2651 | |
2652 | void | |
187b041e | 2653 | linux_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch, |
480af54c | 2654 | int num_disp_step_buffers) |
a5ee0f0c | 2655 | { |
480af54c | 2656 | if (num_disp_step_buffers > 0) |
187b041e | 2657 | { |
480af54c SM |
2658 | linux_gdbarch_data *gdbarch_data = get_linux_gdbarch_data (gdbarch); |
2659 | gdbarch_data->num_disp_step_buffers = num_disp_step_buffers; | |
2660 | ||
2661 | set_gdbarch_displaced_step_prepare (gdbarch, | |
2662 | linux_displaced_step_prepare); | |
187b041e SM |
2663 | set_gdbarch_displaced_step_finish (gdbarch, linux_displaced_step_finish); |
2664 | set_gdbarch_displaced_step_copy_insn_closure_by_addr | |
2665 | (gdbarch, linux_displaced_step_copy_insn_closure_by_addr); | |
2666 | set_gdbarch_displaced_step_restore_all_in_ptid | |
2667 | (gdbarch, linux_displaced_step_restore_all_in_ptid); | |
2668 | } | |
2669 | ||
a5ee0f0c | 2670 | set_gdbarch_core_pid_to_str (gdbarch, linux_core_pid_to_str); |
3030c96e | 2671 | set_gdbarch_info_proc (gdbarch, linux_info_proc); |
451b7c33 | 2672 | set_gdbarch_core_info_proc (gdbarch, linux_core_info_proc); |
382b69bb | 2673 | set_gdbarch_core_xfer_siginfo (gdbarch, linux_core_xfer_siginfo); |
db082f59 | 2674 | set_gdbarch_read_core_file_mappings (gdbarch, linux_read_core_file_mappings); |
35c2fab7 | 2675 | set_gdbarch_find_memory_regions (gdbarch, linux_find_memory_regions); |
f968fe80 | 2676 | set_gdbarch_make_corefile_notes (gdbarch, linux_make_corefile_notes); |
33fbcbee PA |
2677 | set_gdbarch_has_shared_address_space (gdbarch, |
2678 | linux_has_shared_address_space); | |
eb14d406 SDJ |
2679 | set_gdbarch_gdb_signal_from_target (gdbarch, |
2680 | linux_gdb_signal_from_target); | |
2681 | set_gdbarch_gdb_signal_to_target (gdbarch, | |
2682 | linux_gdb_signal_to_target); | |
3437254d | 2683 | set_gdbarch_vsyscall_range (gdbarch, linux_vsyscall_range); |
3bc3cebe | 2684 | set_gdbarch_infcall_mmap (gdbarch, linux_infcall_mmap); |
7f361056 | 2685 | set_gdbarch_infcall_munmap (gdbarch, linux_infcall_munmap); |
5cd867b4 | 2686 | set_gdbarch_get_siginfo_type (gdbarch, linux_get_siginfo_type); |
a5ee0f0c | 2687 | } |
06253dd3 | 2688 | |
6c265988 | 2689 | void _initialize_linux_tdep (); |
06253dd3 | 2690 | void |
6c265988 | 2691 | _initialize_linux_tdep () |
06253dd3 JK |
2692 | { |
2693 | linux_gdbarch_data_handle = | |
d9655058 | 2694 | gdbarch_data_register_pre_init (init_linux_gdbarch_data); |
cdfa0b0a | 2695 | |
cdfa0b0a | 2696 | /* Observers used to invalidate the cache when needed. */ |
c90e7d63 SM |
2697 | gdb::observers::inferior_exit.attach (invalidate_linux_cache_inf, |
2698 | "linux-tdep"); | |
2699 | gdb::observers::inferior_appeared.attach (invalidate_linux_cache_inf, | |
2700 | "linux-tdep"); | |
2701 | gdb::observers::inferior_execd.attach (invalidate_linux_cache_inf, | |
2702 | "linux-tdep"); | |
df8411da SDJ |
2703 | |
2704 | add_setshow_boolean_cmd ("use-coredump-filter", class_files, | |
2705 | &use_coredump_filter, _("\ | |
2706 | Set whether gcore should consider /proc/PID/coredump_filter."), | |
2707 | _("\ | |
2708 | Show whether gcore should consider /proc/PID/coredump_filter."), | |
2709 | _("\ | |
2710 | Use this command to set whether gcore should consider the contents\n\ | |
2711 | of /proc/PID/coredump_filter when generating the corefile. For more information\n\ | |
2712 | about this file, refer to the manpage of core(5)."), | |
2713 | NULL, show_use_coredump_filter, | |
2714 | &setlist, &showlist); | |
afa840dc SL |
2715 | |
2716 | add_setshow_boolean_cmd ("dump-excluded-mappings", class_files, | |
2717 | &dump_excluded_mappings, _("\ | |
2718 | Set whether gcore should dump mappings marked with the VM_DONTDUMP flag."), | |
2719 | _("\ | |
2720 | Show whether gcore should dump mappings marked with the VM_DONTDUMP flag."), | |
2721 | _("\ | |
2722 | Use this command to set whether gcore should dump mappings marked with the\n\ | |
2723 | VM_DONTDUMP flag (\"dd\" in /proc/PID/smaps) when generating the corefile. For\n\ | |
2724 | more information about this file, refer to the manpage of proc(5) and core(5)."), | |
2725 | NULL, show_dump_excluded_mappings, | |
2726 | &setlist, &showlist); | |
06253dd3 | 2727 | } |