Commit | Line | Data |
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da6d8c04 | 1 | /* Low level interface to ptrace, for the remote server for GDB. |
88b9d363 | 2 | Copyright (C) 1995-2022 Free Software Foundation, Inc. |
da6d8c04 DJ |
3 | |
4 | This file is part of GDB. | |
5 | ||
6 | This program is free software; you can redistribute it and/or modify | |
7 | it under the terms of the GNU General Public License as published by | |
a9762ec7 | 8 | the Free Software Foundation; either version 3 of the License, or |
da6d8c04 DJ |
9 | (at your option) any later version. |
10 | ||
11 | This program is distributed in the hope that it will be useful, | |
12 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
13 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
14 | GNU General Public License for more details. | |
15 | ||
16 | You should have received a copy of the GNU General Public License | |
a9762ec7 | 17 | along with this program. If not, see <http://www.gnu.org/licenses/>. */ |
da6d8c04 DJ |
18 | |
19 | #include "server.h" | |
58caa3dc | 20 | #include "linux-low.h" |
125f8a3d | 21 | #include "nat/linux-osdata.h" |
268a13a5 | 22 | #include "gdbsupport/agent.h" |
de0d863e | 23 | #include "tdesc.h" |
268a13a5 TT |
24 | #include "gdbsupport/rsp-low.h" |
25 | #include "gdbsupport/signals-state-save-restore.h" | |
96d7229d LM |
26 | #include "nat/linux-nat.h" |
27 | #include "nat/linux-waitpid.h" | |
268a13a5 | 28 | #include "gdbsupport/gdb_wait.h" |
5826e159 | 29 | #include "nat/gdb_ptrace.h" |
125f8a3d GB |
30 | #include "nat/linux-ptrace.h" |
31 | #include "nat/linux-procfs.h" | |
8cc73a39 | 32 | #include "nat/linux-personality.h" |
da6d8c04 DJ |
33 | #include <signal.h> |
34 | #include <sys/ioctl.h> | |
35 | #include <fcntl.h> | |
0a30fbc4 | 36 | #include <unistd.h> |
fd500816 | 37 | #include <sys/syscall.h> |
f9387fc3 | 38 | #include <sched.h> |
07e059b5 VP |
39 | #include <ctype.h> |
40 | #include <pwd.h> | |
41 | #include <sys/types.h> | |
42 | #include <dirent.h> | |
53ce3c39 | 43 | #include <sys/stat.h> |
efcbbd14 | 44 | #include <sys/vfs.h> |
1570b33e | 45 | #include <sys/uio.h> |
268a13a5 | 46 | #include "gdbsupport/filestuff.h" |
c144c7a0 | 47 | #include "tracepoint.h" |
276d4552 | 48 | #include <inttypes.h> |
268a13a5 | 49 | #include "gdbsupport/common-inferior.h" |
2090129c | 50 | #include "nat/fork-inferior.h" |
268a13a5 | 51 | #include "gdbsupport/environ.h" |
21987b9c | 52 | #include "gdbsupport/gdb-sigmask.h" |
268a13a5 | 53 | #include "gdbsupport/scoped_restore.h" |
957f3f49 DE |
54 | #ifndef ELFMAG0 |
55 | /* Don't include <linux/elf.h> here. If it got included by gdb_proc_service.h | |
56 | then ELFMAG0 will have been defined. If it didn't get included by | |
57 | gdb_proc_service.h then including it will likely introduce a duplicate | |
58 | definition of elf_fpregset_t. */ | |
59 | #include <elf.h> | |
60 | #endif | |
14d2069a | 61 | #include "nat/linux-namespaces.h" |
efcbbd14 | 62 | |
fd462a61 DJ |
63 | #ifndef O_LARGEFILE |
64 | #define O_LARGEFILE 0 | |
65 | #endif | |
1a981360 | 66 | |
69f4c9cc AH |
67 | #ifndef AT_HWCAP2 |
68 | #define AT_HWCAP2 26 | |
69 | #endif | |
70 | ||
db0dfaa0 LM |
71 | /* Some targets did not define these ptrace constants from the start, |
72 | so gdbserver defines them locally here. In the future, these may | |
73 | be removed after they are added to asm/ptrace.h. */ | |
74 | #if !(defined(PT_TEXT_ADDR) \ | |
75 | || defined(PT_DATA_ADDR) \ | |
76 | || defined(PT_TEXT_END_ADDR)) | |
77 | #if defined(__mcoldfire__) | |
78 | /* These are still undefined in 3.10 kernels. */ | |
79 | #define PT_TEXT_ADDR 49*4 | |
80 | #define PT_DATA_ADDR 50*4 | |
81 | #define PT_TEXT_END_ADDR 51*4 | |
db0dfaa0 LM |
82 | /* These are still undefined in 3.10 kernels. */ |
83 | #elif defined(__TMS320C6X__) | |
84 | #define PT_TEXT_ADDR (0x10000*4) | |
85 | #define PT_DATA_ADDR (0x10004*4) | |
86 | #define PT_TEXT_END_ADDR (0x10008*4) | |
87 | #endif | |
88 | #endif | |
89 | ||
5203ae1e TBA |
90 | #if (defined(__UCLIBC__) \ |
91 | && defined(HAS_NOMMU) \ | |
92 | && defined(PT_TEXT_ADDR) \ | |
93 | && defined(PT_DATA_ADDR) \ | |
94 | && defined(PT_TEXT_END_ADDR)) | |
95 | #define SUPPORTS_READ_OFFSETS | |
96 | #endif | |
97 | ||
9accd112 | 98 | #ifdef HAVE_LINUX_BTRACE |
125f8a3d | 99 | # include "nat/linux-btrace.h" |
268a13a5 | 100 | # include "gdbsupport/btrace-common.h" |
9accd112 MM |
101 | #endif |
102 | ||
8365dcf5 TJB |
103 | #ifndef HAVE_ELF32_AUXV_T |
104 | /* Copied from glibc's elf.h. */ | |
105 | typedef struct | |
106 | { | |
107 | uint32_t a_type; /* Entry type */ | |
108 | union | |
109 | { | |
110 | uint32_t a_val; /* Integer value */ | |
111 | /* We use to have pointer elements added here. We cannot do that, | |
112 | though, since it does not work when using 32-bit definitions | |
113 | on 64-bit platforms and vice versa. */ | |
114 | } a_un; | |
115 | } Elf32_auxv_t; | |
116 | #endif | |
117 | ||
118 | #ifndef HAVE_ELF64_AUXV_T | |
119 | /* Copied from glibc's elf.h. */ | |
120 | typedef struct | |
121 | { | |
122 | uint64_t a_type; /* Entry type */ | |
123 | union | |
124 | { | |
125 | uint64_t a_val; /* Integer value */ | |
126 | /* We use to have pointer elements added here. We cannot do that, | |
127 | though, since it does not work when using 32-bit definitions | |
128 | on 64-bit platforms and vice versa. */ | |
129 | } a_un; | |
130 | } Elf64_auxv_t; | |
131 | #endif | |
132 | ||
ded48a5e YQ |
133 | /* Does the current host support PTRACE_GETREGSET? */ |
134 | int have_ptrace_getregset = -1; | |
135 | ||
cff068da GB |
136 | /* LWP accessors. */ |
137 | ||
138 | /* See nat/linux-nat.h. */ | |
139 | ||
140 | ptid_t | |
141 | ptid_of_lwp (struct lwp_info *lwp) | |
142 | { | |
143 | return ptid_of (get_lwp_thread (lwp)); | |
144 | } | |
145 | ||
146 | /* See nat/linux-nat.h. */ | |
147 | ||
4b134ca1 GB |
148 | void |
149 | lwp_set_arch_private_info (struct lwp_info *lwp, | |
150 | struct arch_lwp_info *info) | |
151 | { | |
152 | lwp->arch_private = info; | |
153 | } | |
154 | ||
155 | /* See nat/linux-nat.h. */ | |
156 | ||
157 | struct arch_lwp_info * | |
158 | lwp_arch_private_info (struct lwp_info *lwp) | |
159 | { | |
160 | return lwp->arch_private; | |
161 | } | |
162 | ||
163 | /* See nat/linux-nat.h. */ | |
164 | ||
cff068da GB |
165 | int |
166 | lwp_is_stopped (struct lwp_info *lwp) | |
167 | { | |
168 | return lwp->stopped; | |
169 | } | |
170 | ||
171 | /* See nat/linux-nat.h. */ | |
172 | ||
173 | enum target_stop_reason | |
174 | lwp_stop_reason (struct lwp_info *lwp) | |
175 | { | |
176 | return lwp->stop_reason; | |
177 | } | |
178 | ||
0e00e962 AA |
179 | /* See nat/linux-nat.h. */ |
180 | ||
181 | int | |
182 | lwp_is_stepping (struct lwp_info *lwp) | |
183 | { | |
184 | return lwp->stepping; | |
185 | } | |
186 | ||
05044653 PA |
187 | /* A list of all unknown processes which receive stop signals. Some |
188 | other process will presumably claim each of these as forked | |
189 | children momentarily. */ | |
24a09b5f | 190 | |
05044653 PA |
191 | struct simple_pid_list |
192 | { | |
193 | /* The process ID. */ | |
194 | int pid; | |
195 | ||
196 | /* The status as reported by waitpid. */ | |
197 | int status; | |
198 | ||
199 | /* Next in chain. */ | |
200 | struct simple_pid_list *next; | |
201 | }; | |
05c309a8 | 202 | static struct simple_pid_list *stopped_pids; |
05044653 PA |
203 | |
204 | /* Trivial list manipulation functions to keep track of a list of new | |
205 | stopped processes. */ | |
206 | ||
207 | static void | |
208 | add_to_pid_list (struct simple_pid_list **listp, int pid, int status) | |
209 | { | |
8d749320 | 210 | struct simple_pid_list *new_pid = XNEW (struct simple_pid_list); |
05044653 PA |
211 | |
212 | new_pid->pid = pid; | |
213 | new_pid->status = status; | |
214 | new_pid->next = *listp; | |
215 | *listp = new_pid; | |
216 | } | |
217 | ||
218 | static int | |
219 | pull_pid_from_list (struct simple_pid_list **listp, int pid, int *statusp) | |
220 | { | |
221 | struct simple_pid_list **p; | |
222 | ||
223 | for (p = listp; *p != NULL; p = &(*p)->next) | |
224 | if ((*p)->pid == pid) | |
225 | { | |
226 | struct simple_pid_list *next = (*p)->next; | |
227 | ||
228 | *statusp = (*p)->status; | |
229 | xfree (*p); | |
230 | *p = next; | |
231 | return 1; | |
232 | } | |
233 | return 0; | |
234 | } | |
24a09b5f | 235 | |
bde24c0a PA |
236 | enum stopping_threads_kind |
237 | { | |
238 | /* Not stopping threads presently. */ | |
239 | NOT_STOPPING_THREADS, | |
240 | ||
241 | /* Stopping threads. */ | |
242 | STOPPING_THREADS, | |
243 | ||
244 | /* Stopping and suspending threads. */ | |
245 | STOPPING_AND_SUSPENDING_THREADS | |
246 | }; | |
247 | ||
248 | /* This is set while stop_all_lwps is in effect. */ | |
6bd434d6 | 249 | static stopping_threads_kind stopping_threads = NOT_STOPPING_THREADS; |
0d62e5e8 DJ |
250 | |
251 | /* FIXME make into a target method? */ | |
24a09b5f | 252 | int using_threads = 1; |
24a09b5f | 253 | |
fa593d66 PA |
254 | /* True if we're presently stabilizing threads (moving them out of |
255 | jump pads). */ | |
256 | static int stabilizing_threads; | |
257 | ||
f50bf8e5 | 258 | static void unsuspend_all_lwps (struct lwp_info *except); |
95954743 | 259 | static void mark_lwp_dead (struct lwp_info *lwp, int wstat); |
00db26fa | 260 | static int lwp_is_marked_dead (struct lwp_info *lwp); |
d50171e4 | 261 | static int kill_lwp (unsigned long lwpid, int signo); |
863d01bd | 262 | static void enqueue_pending_signal (struct lwp_info *lwp, int signal, siginfo_t *info); |
ece66d65 | 263 | static int linux_low_ptrace_options (int attached); |
ced2dffb | 264 | static int check_ptrace_stopped_lwp_gone (struct lwp_info *lp); |
d50171e4 | 265 | |
582511be PA |
266 | /* When the event-loop is doing a step-over, this points at the thread |
267 | being stepped. */ | |
6bd434d6 | 268 | static ptid_t step_over_bkpt; |
582511be | 269 | |
bf9ae9d8 TBA |
270 | bool |
271 | linux_process_target::low_supports_breakpoints () | |
272 | { | |
273 | return false; | |
274 | } | |
d50171e4 | 275 | |
bf9ae9d8 TBA |
276 | CORE_ADDR |
277 | linux_process_target::low_get_pc (regcache *regcache) | |
278 | { | |
279 | return 0; | |
280 | } | |
281 | ||
282 | void | |
283 | linux_process_target::low_set_pc (regcache *regcache, CORE_ADDR newpc) | |
d50171e4 | 284 | { |
bf9ae9d8 | 285 | gdb_assert_not_reached ("linux target op low_set_pc is not implemented"); |
d50171e4 | 286 | } |
0d62e5e8 | 287 | |
7582c77c TBA |
288 | std::vector<CORE_ADDR> |
289 | linux_process_target::low_get_next_pcs (regcache *regcache) | |
290 | { | |
291 | gdb_assert_not_reached ("linux target op low_get_next_pcs is not " | |
292 | "implemented"); | |
293 | } | |
294 | ||
d4807ea2 TBA |
295 | int |
296 | linux_process_target::low_decr_pc_after_break () | |
297 | { | |
298 | return 0; | |
299 | } | |
300 | ||
c2d6af84 PA |
301 | /* True if LWP is stopped in its stepping range. */ |
302 | ||
303 | static int | |
304 | lwp_in_step_range (struct lwp_info *lwp) | |
305 | { | |
306 | CORE_ADDR pc = lwp->stop_pc; | |
307 | ||
308 | return (pc >= lwp->step_range_start && pc < lwp->step_range_end); | |
309 | } | |
310 | ||
bd99dc85 PA |
311 | /* The read/write ends of the pipe registered as waitable file in the |
312 | event loop. */ | |
313 | static int linux_event_pipe[2] = { -1, -1 }; | |
314 | ||
315 | /* True if we're currently in async mode. */ | |
316 | #define target_is_async_p() (linux_event_pipe[0] != -1) | |
317 | ||
02fc4de7 | 318 | static void send_sigstop (struct lwp_info *lwp); |
bd99dc85 | 319 | |
d0722149 DE |
320 | /* Return non-zero if HEADER is a 64-bit ELF file. */ |
321 | ||
322 | static int | |
214d508e | 323 | elf_64_header_p (const Elf64_Ehdr *header, unsigned int *machine) |
d0722149 | 324 | { |
214d508e L |
325 | if (header->e_ident[EI_MAG0] == ELFMAG0 |
326 | && header->e_ident[EI_MAG1] == ELFMAG1 | |
327 | && header->e_ident[EI_MAG2] == ELFMAG2 | |
328 | && header->e_ident[EI_MAG3] == ELFMAG3) | |
329 | { | |
330 | *machine = header->e_machine; | |
331 | return header->e_ident[EI_CLASS] == ELFCLASS64; | |
332 | ||
333 | } | |
334 | *machine = EM_NONE; | |
335 | return -1; | |
d0722149 DE |
336 | } |
337 | ||
338 | /* Return non-zero if FILE is a 64-bit ELF file, | |
339 | zero if the file is not a 64-bit ELF file, | |
340 | and -1 if the file is not accessible or doesn't exist. */ | |
341 | ||
be07f1a2 | 342 | static int |
214d508e | 343 | elf_64_file_p (const char *file, unsigned int *machine) |
d0722149 | 344 | { |
957f3f49 | 345 | Elf64_Ehdr header; |
d0722149 DE |
346 | int fd; |
347 | ||
348 | fd = open (file, O_RDONLY); | |
349 | if (fd < 0) | |
350 | return -1; | |
351 | ||
352 | if (read (fd, &header, sizeof (header)) != sizeof (header)) | |
353 | { | |
354 | close (fd); | |
355 | return 0; | |
356 | } | |
357 | close (fd); | |
358 | ||
214d508e | 359 | return elf_64_header_p (&header, machine); |
d0722149 DE |
360 | } |
361 | ||
be07f1a2 PA |
362 | /* Accepts an integer PID; Returns true if the executable PID is |
363 | running is a 64-bit ELF file.. */ | |
364 | ||
365 | int | |
214d508e | 366 | linux_pid_exe_is_elf_64_file (int pid, unsigned int *machine) |
be07f1a2 | 367 | { |
d8d2a3ee | 368 | char file[PATH_MAX]; |
be07f1a2 PA |
369 | |
370 | sprintf (file, "/proc/%d/exe", pid); | |
214d508e | 371 | return elf_64_file_p (file, machine); |
be07f1a2 PA |
372 | } |
373 | ||
fd000fb3 TBA |
374 | void |
375 | linux_process_target::delete_lwp (lwp_info *lwp) | |
bd99dc85 | 376 | { |
fa96cb38 PA |
377 | struct thread_info *thr = get_lwp_thread (lwp); |
378 | ||
379 | if (debug_threads) | |
380 | debug_printf ("deleting %ld\n", lwpid_of (thr)); | |
381 | ||
382 | remove_thread (thr); | |
466eecee | 383 | |
fd000fb3 | 384 | low_delete_thread (lwp->arch_private); |
466eecee | 385 | |
013e3554 | 386 | delete lwp; |
bd99dc85 PA |
387 | } |
388 | ||
fd000fb3 TBA |
389 | void |
390 | linux_process_target::low_delete_thread (arch_lwp_info *info) | |
391 | { | |
392 | /* Default implementation should be overridden if architecture-specific | |
393 | info is being used. */ | |
394 | gdb_assert (info == nullptr); | |
395 | } | |
95954743 | 396 | |
fd000fb3 TBA |
397 | process_info * |
398 | linux_process_target::add_linux_process (int pid, int attached) | |
95954743 PA |
399 | { |
400 | struct process_info *proc; | |
401 | ||
95954743 | 402 | proc = add_process (pid, attached); |
8d749320 | 403 | proc->priv = XCNEW (struct process_info_private); |
95954743 | 404 | |
fd000fb3 | 405 | proc->priv->arch_private = low_new_process (); |
aa5ca48f | 406 | |
95954743 PA |
407 | return proc; |
408 | } | |
409 | ||
fd000fb3 TBA |
410 | arch_process_info * |
411 | linux_process_target::low_new_process () | |
412 | { | |
413 | return nullptr; | |
414 | } | |
415 | ||
416 | void | |
417 | linux_process_target::low_delete_process (arch_process_info *info) | |
418 | { | |
419 | /* Default implementation must be overridden if architecture-specific | |
420 | info exists. */ | |
421 | gdb_assert (info == nullptr); | |
422 | } | |
423 | ||
424 | void | |
425 | linux_process_target::low_new_fork (process_info *parent, process_info *child) | |
426 | { | |
427 | /* Nop. */ | |
428 | } | |
429 | ||
797bcff5 TBA |
430 | void |
431 | linux_process_target::arch_setup_thread (thread_info *thread) | |
94585166 DB |
432 | { |
433 | struct thread_info *saved_thread; | |
434 | ||
435 | saved_thread = current_thread; | |
436 | current_thread = thread; | |
437 | ||
797bcff5 | 438 | low_arch_setup (); |
94585166 DB |
439 | |
440 | current_thread = saved_thread; | |
441 | } | |
442 | ||
d16f3f6c TBA |
443 | int |
444 | linux_process_target::handle_extended_wait (lwp_info **orig_event_lwp, | |
445 | int wstat) | |
24a09b5f | 446 | { |
c12a5089 | 447 | client_state &cs = get_client_state (); |
94585166 | 448 | struct lwp_info *event_lwp = *orig_event_lwp; |
89a5711c | 449 | int event = linux_ptrace_get_extended_event (wstat); |
de0d863e | 450 | struct thread_info *event_thr = get_lwp_thread (event_lwp); |
54a0b537 | 451 | struct lwp_info *new_lwp; |
24a09b5f | 452 | |
65706a29 PA |
453 | gdb_assert (event_lwp->waitstatus.kind == TARGET_WAITKIND_IGNORE); |
454 | ||
82075af2 JS |
455 | /* All extended events we currently use are mid-syscall. Only |
456 | PTRACE_EVENT_STOP is delivered more like a signal-stop, but | |
457 | you have to be using PTRACE_SEIZE to get that. */ | |
458 | event_lwp->syscall_state = TARGET_WAITKIND_SYSCALL_ENTRY; | |
459 | ||
c269dbdb DB |
460 | if ((event == PTRACE_EVENT_FORK) || (event == PTRACE_EVENT_VFORK) |
461 | || (event == PTRACE_EVENT_CLONE)) | |
24a09b5f | 462 | { |
95954743 | 463 | ptid_t ptid; |
24a09b5f | 464 | unsigned long new_pid; |
05044653 | 465 | int ret, status; |
24a09b5f | 466 | |
de0d863e | 467 | /* Get the pid of the new lwp. */ |
d86d4aaf | 468 | ptrace (PTRACE_GETEVENTMSG, lwpid_of (event_thr), (PTRACE_TYPE_ARG3) 0, |
56f7af9c | 469 | &new_pid); |
24a09b5f DJ |
470 | |
471 | /* If we haven't already seen the new PID stop, wait for it now. */ | |
05044653 | 472 | if (!pull_pid_from_list (&stopped_pids, new_pid, &status)) |
24a09b5f DJ |
473 | { |
474 | /* The new child has a pending SIGSTOP. We can't affect it until it | |
475 | hits the SIGSTOP, but we're already attached. */ | |
476 | ||
97438e3f | 477 | ret = my_waitpid (new_pid, &status, __WALL); |
24a09b5f DJ |
478 | |
479 | if (ret == -1) | |
480 | perror_with_name ("waiting for new child"); | |
481 | else if (ret != new_pid) | |
482 | warning ("wait returned unexpected PID %d", ret); | |
da5898ce | 483 | else if (!WIFSTOPPED (status)) |
24a09b5f DJ |
484 | warning ("wait returned unexpected status 0x%x", status); |
485 | } | |
486 | ||
c269dbdb | 487 | if (event == PTRACE_EVENT_FORK || event == PTRACE_EVENT_VFORK) |
de0d863e DB |
488 | { |
489 | struct process_info *parent_proc; | |
490 | struct process_info *child_proc; | |
491 | struct lwp_info *child_lwp; | |
bfacd19d | 492 | struct thread_info *child_thr; |
de0d863e | 493 | |
fd79271b | 494 | ptid = ptid_t (new_pid, new_pid, 0); |
de0d863e DB |
495 | |
496 | if (debug_threads) | |
497 | { | |
498 | debug_printf ("HEW: Got fork event from LWP %ld, " | |
499 | "new child is %d\n", | |
e38504b3 | 500 | ptid_of (event_thr).lwp (), |
e99b03dc | 501 | ptid.pid ()); |
de0d863e DB |
502 | } |
503 | ||
504 | /* Add the new process to the tables and clone the breakpoint | |
505 | lists of the parent. We need to do this even if the new process | |
506 | will be detached, since we will need the process object and the | |
507 | breakpoints to remove any breakpoints from memory when we | |
508 | detach, and the client side will access registers. */ | |
fd000fb3 | 509 | child_proc = add_linux_process (new_pid, 0); |
de0d863e DB |
510 | gdb_assert (child_proc != NULL); |
511 | child_lwp = add_lwp (ptid); | |
512 | gdb_assert (child_lwp != NULL); | |
513 | child_lwp->stopped = 1; | |
bfacd19d DB |
514 | child_lwp->must_set_ptrace_flags = 1; |
515 | child_lwp->status_pending_p = 0; | |
516 | child_thr = get_lwp_thread (child_lwp); | |
517 | child_thr->last_resume_kind = resume_stop; | |
998d452a PA |
518 | child_thr->last_status.kind = TARGET_WAITKIND_STOPPED; |
519 | ||
863d01bd | 520 | /* If we're suspending all threads, leave this one suspended |
0f8288ae YQ |
521 | too. If the fork/clone parent is stepping over a breakpoint, |
522 | all other threads have been suspended already. Leave the | |
523 | child suspended too. */ | |
524 | if (stopping_threads == STOPPING_AND_SUSPENDING_THREADS | |
525 | || event_lwp->bp_reinsert != 0) | |
863d01bd PA |
526 | { |
527 | if (debug_threads) | |
528 | debug_printf ("HEW: leaving child suspended\n"); | |
529 | child_lwp->suspended = 1; | |
530 | } | |
531 | ||
de0d863e DB |
532 | parent_proc = get_thread_process (event_thr); |
533 | child_proc->attached = parent_proc->attached; | |
2e7b624b YQ |
534 | |
535 | if (event_lwp->bp_reinsert != 0 | |
7582c77c | 536 | && supports_software_single_step () |
2e7b624b YQ |
537 | && event == PTRACE_EVENT_VFORK) |
538 | { | |
3b9a79ef YQ |
539 | /* If we leave single-step breakpoints there, child will |
540 | hit it, so uninsert single-step breakpoints from parent | |
2e7b624b YQ |
541 | (and child). Once vfork child is done, reinsert |
542 | them back to parent. */ | |
3b9a79ef | 543 | uninsert_single_step_breakpoints (event_thr); |
2e7b624b YQ |
544 | } |
545 | ||
63c40ec7 | 546 | clone_all_breakpoints (child_thr, event_thr); |
de0d863e | 547 | |
51a948fd AB |
548 | target_desc_up tdesc = allocate_target_description (); |
549 | copy_target_description (tdesc.get (), parent_proc->tdesc); | |
550 | child_proc->tdesc = tdesc.release (); | |
de0d863e | 551 | |
3a8a0396 | 552 | /* Clone arch-specific process data. */ |
fd000fb3 | 553 | low_new_fork (parent_proc, child_proc); |
3a8a0396 | 554 | |
de0d863e | 555 | /* Save fork info in the parent thread. */ |
c269dbdb DB |
556 | if (event == PTRACE_EVENT_FORK) |
557 | event_lwp->waitstatus.kind = TARGET_WAITKIND_FORKED; | |
558 | else if (event == PTRACE_EVENT_VFORK) | |
559 | event_lwp->waitstatus.kind = TARGET_WAITKIND_VFORKED; | |
560 | ||
de0d863e | 561 | event_lwp->waitstatus.value.related_pid = ptid; |
c269dbdb | 562 | |
de0d863e DB |
563 | /* The status_pending field contains bits denoting the |
564 | extended event, so when the pending event is handled, | |
565 | the handler will look at lwp->waitstatus. */ | |
566 | event_lwp->status_pending_p = 1; | |
567 | event_lwp->status_pending = wstat; | |
568 | ||
5a04c4cf PA |
569 | /* Link the threads until the parent event is passed on to |
570 | higher layers. */ | |
571 | event_lwp->fork_relative = child_lwp; | |
572 | child_lwp->fork_relative = event_lwp; | |
573 | ||
3b9a79ef YQ |
574 | /* If the parent thread is doing step-over with single-step |
575 | breakpoints, the list of single-step breakpoints are cloned | |
2e7b624b YQ |
576 | from the parent's. Remove them from the child process. |
577 | In case of vfork, we'll reinsert them back once vforked | |
578 | child is done. */ | |
8a81c5d7 | 579 | if (event_lwp->bp_reinsert != 0 |
7582c77c | 580 | && supports_software_single_step ()) |
8a81c5d7 | 581 | { |
8a81c5d7 YQ |
582 | /* The child process is forked and stopped, so it is safe |
583 | to access its memory without stopping all other threads | |
584 | from other processes. */ | |
3b9a79ef | 585 | delete_single_step_breakpoints (child_thr); |
8a81c5d7 | 586 | |
3b9a79ef YQ |
587 | gdb_assert (has_single_step_breakpoints (event_thr)); |
588 | gdb_assert (!has_single_step_breakpoints (child_thr)); | |
8a81c5d7 YQ |
589 | } |
590 | ||
de0d863e DB |
591 | /* Report the event. */ |
592 | return 0; | |
593 | } | |
594 | ||
fa96cb38 PA |
595 | if (debug_threads) |
596 | debug_printf ("HEW: Got clone event " | |
597 | "from LWP %ld, new child is LWP %ld\n", | |
598 | lwpid_of (event_thr), new_pid); | |
599 | ||
fd79271b | 600 | ptid = ptid_t (pid_of (event_thr), new_pid, 0); |
b3312d80 | 601 | new_lwp = add_lwp (ptid); |
24a09b5f | 602 | |
e27d73f6 | 603 | /* Either we're going to immediately resume the new thread |
df95181f | 604 | or leave it stopped. resume_one_lwp is a nop if it |
e27d73f6 | 605 | thinks the thread is currently running, so set this first |
df95181f | 606 | before calling resume_one_lwp. */ |
e27d73f6 DE |
607 | new_lwp->stopped = 1; |
608 | ||
0f8288ae YQ |
609 | /* If we're suspending all threads, leave this one suspended |
610 | too. If the fork/clone parent is stepping over a breakpoint, | |
611 | all other threads have been suspended already. Leave the | |
612 | child suspended too. */ | |
613 | if (stopping_threads == STOPPING_AND_SUSPENDING_THREADS | |
614 | || event_lwp->bp_reinsert != 0) | |
bde24c0a PA |
615 | new_lwp->suspended = 1; |
616 | ||
da5898ce DJ |
617 | /* Normally we will get the pending SIGSTOP. But in some cases |
618 | we might get another signal delivered to the group first. | |
f21cc1a2 | 619 | If we do get another signal, be sure not to lose it. */ |
20ba1ce6 | 620 | if (WSTOPSIG (status) != SIGSTOP) |
da5898ce | 621 | { |
54a0b537 | 622 | new_lwp->stop_expected = 1; |
20ba1ce6 PA |
623 | new_lwp->status_pending_p = 1; |
624 | new_lwp->status_pending = status; | |
da5898ce | 625 | } |
c12a5089 | 626 | else if (cs.report_thread_events) |
65706a29 PA |
627 | { |
628 | new_lwp->waitstatus.kind = TARGET_WAITKIND_THREAD_CREATED; | |
629 | new_lwp->status_pending_p = 1; | |
630 | new_lwp->status_pending = status; | |
631 | } | |
de0d863e | 632 | |
a0aad537 | 633 | #ifdef USE_THREAD_DB |
94c207e0 | 634 | thread_db_notice_clone (event_thr, ptid); |
a0aad537 | 635 | #endif |
86299109 | 636 | |
de0d863e DB |
637 | /* Don't report the event. */ |
638 | return 1; | |
24a09b5f | 639 | } |
c269dbdb DB |
640 | else if (event == PTRACE_EVENT_VFORK_DONE) |
641 | { | |
642 | event_lwp->waitstatus.kind = TARGET_WAITKIND_VFORK_DONE; | |
643 | ||
7582c77c | 644 | if (event_lwp->bp_reinsert != 0 && supports_software_single_step ()) |
2e7b624b | 645 | { |
3b9a79ef | 646 | reinsert_single_step_breakpoints (event_thr); |
2e7b624b | 647 | |
3b9a79ef | 648 | gdb_assert (has_single_step_breakpoints (event_thr)); |
2e7b624b YQ |
649 | } |
650 | ||
c269dbdb DB |
651 | /* Report the event. */ |
652 | return 0; | |
653 | } | |
c12a5089 | 654 | else if (event == PTRACE_EVENT_EXEC && cs.report_exec_events) |
94585166 DB |
655 | { |
656 | struct process_info *proc; | |
f27866ba | 657 | std::vector<int> syscalls_to_catch; |
94585166 DB |
658 | ptid_t event_ptid; |
659 | pid_t event_pid; | |
660 | ||
661 | if (debug_threads) | |
662 | { | |
663 | debug_printf ("HEW: Got exec event from LWP %ld\n", | |
664 | lwpid_of (event_thr)); | |
665 | } | |
666 | ||
667 | /* Get the event ptid. */ | |
668 | event_ptid = ptid_of (event_thr); | |
e99b03dc | 669 | event_pid = event_ptid.pid (); |
94585166 | 670 | |
82075af2 | 671 | /* Save the syscall list from the execing process. */ |
94585166 | 672 | proc = get_thread_process (event_thr); |
f27866ba | 673 | syscalls_to_catch = std::move (proc->syscalls_to_catch); |
82075af2 JS |
674 | |
675 | /* Delete the execing process and all its threads. */ | |
d16f3f6c | 676 | mourn (proc); |
94585166 DB |
677 | current_thread = NULL; |
678 | ||
679 | /* Create a new process/lwp/thread. */ | |
fd000fb3 | 680 | proc = add_linux_process (event_pid, 0); |
94585166 DB |
681 | event_lwp = add_lwp (event_ptid); |
682 | event_thr = get_lwp_thread (event_lwp); | |
683 | gdb_assert (current_thread == event_thr); | |
797bcff5 | 684 | arch_setup_thread (event_thr); |
94585166 DB |
685 | |
686 | /* Set the event status. */ | |
687 | event_lwp->waitstatus.kind = TARGET_WAITKIND_EXECD; | |
688 | event_lwp->waitstatus.value.execd_pathname | |
689 | = xstrdup (linux_proc_pid_to_exec_file (lwpid_of (event_thr))); | |
690 | ||
691 | /* Mark the exec status as pending. */ | |
692 | event_lwp->stopped = 1; | |
693 | event_lwp->status_pending_p = 1; | |
694 | event_lwp->status_pending = wstat; | |
695 | event_thr->last_resume_kind = resume_continue; | |
696 | event_thr->last_status.kind = TARGET_WAITKIND_IGNORE; | |
697 | ||
82075af2 JS |
698 | /* Update syscall state in the new lwp, effectively mid-syscall too. */ |
699 | event_lwp->syscall_state = TARGET_WAITKIND_SYSCALL_ENTRY; | |
700 | ||
701 | /* Restore the list to catch. Don't rely on the client, which is free | |
702 | to avoid sending a new list when the architecture doesn't change. | |
703 | Also, for ANY_SYSCALL, the architecture doesn't really matter. */ | |
f27866ba | 704 | proc->syscalls_to_catch = std::move (syscalls_to_catch); |
82075af2 | 705 | |
94585166 DB |
706 | /* Report the event. */ |
707 | *orig_event_lwp = event_lwp; | |
708 | return 0; | |
709 | } | |
de0d863e DB |
710 | |
711 | internal_error (__FILE__, __LINE__, _("unknown ptrace event %d"), event); | |
24a09b5f DJ |
712 | } |
713 | ||
df95181f TBA |
714 | CORE_ADDR |
715 | linux_process_target::get_pc (lwp_info *lwp) | |
d50171e4 | 716 | { |
0bfdf32f | 717 | struct thread_info *saved_thread; |
d50171e4 PA |
718 | struct regcache *regcache; |
719 | CORE_ADDR pc; | |
720 | ||
bf9ae9d8 | 721 | if (!low_supports_breakpoints ()) |
d50171e4 PA |
722 | return 0; |
723 | ||
0bfdf32f GB |
724 | saved_thread = current_thread; |
725 | current_thread = get_lwp_thread (lwp); | |
d50171e4 | 726 | |
0bfdf32f | 727 | regcache = get_thread_regcache (current_thread, 1); |
bf9ae9d8 | 728 | pc = low_get_pc (regcache); |
d50171e4 PA |
729 | |
730 | if (debug_threads) | |
87ce2a04 | 731 | debug_printf ("pc is 0x%lx\n", (long) pc); |
d50171e4 | 732 | |
0bfdf32f | 733 | current_thread = saved_thread; |
d50171e4 PA |
734 | return pc; |
735 | } | |
736 | ||
9eedd27d TBA |
737 | void |
738 | linux_process_target::get_syscall_trapinfo (lwp_info *lwp, int *sysno) | |
82075af2 JS |
739 | { |
740 | struct thread_info *saved_thread; | |
741 | struct regcache *regcache; | |
742 | ||
82075af2 JS |
743 | saved_thread = current_thread; |
744 | current_thread = get_lwp_thread (lwp); | |
745 | ||
746 | regcache = get_thread_regcache (current_thread, 1); | |
9eedd27d | 747 | low_get_syscall_trapinfo (regcache, sysno); |
82075af2 JS |
748 | |
749 | if (debug_threads) | |
4cc32bec | 750 | debug_printf ("get_syscall_trapinfo sysno %d\n", *sysno); |
82075af2 JS |
751 | |
752 | current_thread = saved_thread; | |
753 | } | |
754 | ||
9eedd27d TBA |
755 | void |
756 | linux_process_target::low_get_syscall_trapinfo (regcache *regcache, int *sysno) | |
757 | { | |
758 | /* By default, report an unknown system call number. */ | |
759 | *sysno = UNKNOWN_SYSCALL; | |
760 | } | |
761 | ||
df95181f TBA |
762 | bool |
763 | linux_process_target::save_stop_reason (lwp_info *lwp) | |
0d62e5e8 | 764 | { |
582511be PA |
765 | CORE_ADDR pc; |
766 | CORE_ADDR sw_breakpoint_pc; | |
767 | struct thread_info *saved_thread; | |
3e572f71 PA |
768 | #if USE_SIGTRAP_SIGINFO |
769 | siginfo_t siginfo; | |
770 | #endif | |
d50171e4 | 771 | |
bf9ae9d8 | 772 | if (!low_supports_breakpoints ()) |
df95181f | 773 | return false; |
0d62e5e8 | 774 | |
582511be | 775 | pc = get_pc (lwp); |
d4807ea2 | 776 | sw_breakpoint_pc = pc - low_decr_pc_after_break (); |
d50171e4 | 777 | |
582511be PA |
778 | /* breakpoint_at reads from the current thread. */ |
779 | saved_thread = current_thread; | |
780 | current_thread = get_lwp_thread (lwp); | |
47c0c975 | 781 | |
3e572f71 PA |
782 | #if USE_SIGTRAP_SIGINFO |
783 | if (ptrace (PTRACE_GETSIGINFO, lwpid_of (current_thread), | |
784 | (PTRACE_TYPE_ARG3) 0, &siginfo) == 0) | |
785 | { | |
786 | if (siginfo.si_signo == SIGTRAP) | |
787 | { | |
e7ad2f14 PA |
788 | if (GDB_ARCH_IS_TRAP_BRKPT (siginfo.si_code) |
789 | && GDB_ARCH_IS_TRAP_HWBKPT (siginfo.si_code)) | |
3e572f71 | 790 | { |
e7ad2f14 PA |
791 | /* The si_code is ambiguous on this arch -- check debug |
792 | registers. */ | |
793 | if (!check_stopped_by_watchpoint (lwp)) | |
794 | lwp->stop_reason = TARGET_STOPPED_BY_SW_BREAKPOINT; | |
795 | } | |
796 | else if (GDB_ARCH_IS_TRAP_BRKPT (siginfo.si_code)) | |
797 | { | |
798 | /* If we determine the LWP stopped for a SW breakpoint, | |
799 | trust it. Particularly don't check watchpoint | |
800 | registers, because at least on s390, we'd find | |
801 | stopped-by-watchpoint as long as there's a watchpoint | |
802 | set. */ | |
3e572f71 | 803 | lwp->stop_reason = TARGET_STOPPED_BY_SW_BREAKPOINT; |
3e572f71 | 804 | } |
e7ad2f14 | 805 | else if (GDB_ARCH_IS_TRAP_HWBKPT (siginfo.si_code)) |
3e572f71 | 806 | { |
e7ad2f14 PA |
807 | /* This can indicate either a hardware breakpoint or |
808 | hardware watchpoint. Check debug registers. */ | |
809 | if (!check_stopped_by_watchpoint (lwp)) | |
810 | lwp->stop_reason = TARGET_STOPPED_BY_HW_BREAKPOINT; | |
3e572f71 | 811 | } |
2bf6fb9d PA |
812 | else if (siginfo.si_code == TRAP_TRACE) |
813 | { | |
e7ad2f14 PA |
814 | /* We may have single stepped an instruction that |
815 | triggered a watchpoint. In that case, on some | |
816 | architectures (such as x86), instead of TRAP_HWBKPT, | |
817 | si_code indicates TRAP_TRACE, and we need to check | |
818 | the debug registers separately. */ | |
819 | if (!check_stopped_by_watchpoint (lwp)) | |
820 | lwp->stop_reason = TARGET_STOPPED_BY_SINGLE_STEP; | |
2bf6fb9d | 821 | } |
3e572f71 PA |
822 | } |
823 | } | |
824 | #else | |
582511be PA |
825 | /* We may have just stepped a breakpoint instruction. E.g., in |
826 | non-stop mode, GDB first tells the thread A to step a range, and | |
827 | then the user inserts a breakpoint inside the range. In that | |
8090aef2 PA |
828 | case we need to report the breakpoint PC. */ |
829 | if ((!lwp->stepping || lwp->stop_pc == sw_breakpoint_pc) | |
d7146cda | 830 | && low_breakpoint_at (sw_breakpoint_pc)) |
e7ad2f14 PA |
831 | lwp->stop_reason = TARGET_STOPPED_BY_SW_BREAKPOINT; |
832 | ||
833 | if (hardware_breakpoint_inserted_here (pc)) | |
834 | lwp->stop_reason = TARGET_STOPPED_BY_HW_BREAKPOINT; | |
835 | ||
836 | if (lwp->stop_reason == TARGET_STOPPED_BY_NO_REASON) | |
837 | check_stopped_by_watchpoint (lwp); | |
838 | #endif | |
839 | ||
840 | if (lwp->stop_reason == TARGET_STOPPED_BY_SW_BREAKPOINT) | |
582511be PA |
841 | { |
842 | if (debug_threads) | |
843 | { | |
844 | struct thread_info *thr = get_lwp_thread (lwp); | |
845 | ||
846 | debug_printf ("CSBB: %s stopped by software breakpoint\n", | |
847 | target_pid_to_str (ptid_of (thr))); | |
848 | } | |
849 | ||
850 | /* Back up the PC if necessary. */ | |
851 | if (pc != sw_breakpoint_pc) | |
e7ad2f14 | 852 | { |
582511be PA |
853 | struct regcache *regcache |
854 | = get_thread_regcache (current_thread, 1); | |
bf9ae9d8 | 855 | low_set_pc (regcache, sw_breakpoint_pc); |
582511be PA |
856 | } |
857 | ||
e7ad2f14 PA |
858 | /* Update this so we record the correct stop PC below. */ |
859 | pc = sw_breakpoint_pc; | |
582511be | 860 | } |
e7ad2f14 | 861 | else if (lwp->stop_reason == TARGET_STOPPED_BY_HW_BREAKPOINT) |
582511be PA |
862 | { |
863 | if (debug_threads) | |
864 | { | |
865 | struct thread_info *thr = get_lwp_thread (lwp); | |
866 | ||
867 | debug_printf ("CSBB: %s stopped by hardware breakpoint\n", | |
868 | target_pid_to_str (ptid_of (thr))); | |
869 | } | |
e7ad2f14 PA |
870 | } |
871 | else if (lwp->stop_reason == TARGET_STOPPED_BY_WATCHPOINT) | |
872 | { | |
873 | if (debug_threads) | |
874 | { | |
875 | struct thread_info *thr = get_lwp_thread (lwp); | |
47c0c975 | 876 | |
e7ad2f14 PA |
877 | debug_printf ("CSBB: %s stopped by hardware watchpoint\n", |
878 | target_pid_to_str (ptid_of (thr))); | |
879 | } | |
582511be | 880 | } |
e7ad2f14 PA |
881 | else if (lwp->stop_reason == TARGET_STOPPED_BY_SINGLE_STEP) |
882 | { | |
883 | if (debug_threads) | |
884 | { | |
885 | struct thread_info *thr = get_lwp_thread (lwp); | |
582511be | 886 | |
e7ad2f14 PA |
887 | debug_printf ("CSBB: %s stopped by trace\n", |
888 | target_pid_to_str (ptid_of (thr))); | |
889 | } | |
890 | } | |
891 | ||
892 | lwp->stop_pc = pc; | |
582511be | 893 | current_thread = saved_thread; |
df95181f | 894 | return true; |
0d62e5e8 | 895 | } |
ce3a066d | 896 | |
fd000fb3 TBA |
897 | lwp_info * |
898 | linux_process_target::add_lwp (ptid_t ptid) | |
611cb4a5 | 899 | { |
8cea61cb | 900 | lwp_info *lwp = new lwp_info; |
0d62e5e8 | 901 | |
754e3168 AH |
902 | lwp->thread = add_thread (ptid, lwp); |
903 | ||
fd000fb3 | 904 | low_new_thread (lwp); |
aa5ca48f | 905 | |
54a0b537 | 906 | return lwp; |
0d62e5e8 | 907 | } |
611cb4a5 | 908 | |
fd000fb3 TBA |
909 | void |
910 | linux_process_target::low_new_thread (lwp_info *info) | |
911 | { | |
912 | /* Nop. */ | |
913 | } | |
914 | ||
2090129c SDJ |
915 | /* Callback to be used when calling fork_inferior, responsible for |
916 | actually initiating the tracing of the inferior. */ | |
917 | ||
918 | static void | |
919 | linux_ptrace_fun () | |
920 | { | |
921 | if (ptrace (PTRACE_TRACEME, 0, (PTRACE_TYPE_ARG3) 0, | |
922 | (PTRACE_TYPE_ARG4) 0) < 0) | |
50fa3001 | 923 | trace_start_error_with_name ("ptrace"); |
2090129c SDJ |
924 | |
925 | if (setpgid (0, 0) < 0) | |
926 | trace_start_error_with_name ("setpgid"); | |
927 | ||
928 | /* If GDBserver is connected to gdb via stdio, redirect the inferior's | |
929 | stdout to stderr so that inferior i/o doesn't corrupt the connection. | |
930 | Also, redirect stdin to /dev/null. */ | |
931 | if (remote_connection_is_stdio ()) | |
932 | { | |
933 | if (close (0) < 0) | |
934 | trace_start_error_with_name ("close"); | |
935 | if (open ("/dev/null", O_RDONLY) < 0) | |
936 | trace_start_error_with_name ("open"); | |
937 | if (dup2 (2, 1) < 0) | |
938 | trace_start_error_with_name ("dup2"); | |
939 | if (write (2, "stdin/stdout redirected\n", | |
940 | sizeof ("stdin/stdout redirected\n") - 1) < 0) | |
941 | { | |
942 | /* Errors ignored. */; | |
943 | } | |
944 | } | |
945 | } | |
946 | ||
da6d8c04 | 947 | /* Start an inferior process and returns its pid. |
2090129c SDJ |
948 | PROGRAM is the name of the program to be started, and PROGRAM_ARGS |
949 | are its arguments. */ | |
da6d8c04 | 950 | |
15295543 TBA |
951 | int |
952 | linux_process_target::create_inferior (const char *program, | |
953 | const std::vector<char *> &program_args) | |
da6d8c04 | 954 | { |
c12a5089 | 955 | client_state &cs = get_client_state (); |
a6dbe5df | 956 | struct lwp_info *new_lwp; |
da6d8c04 | 957 | int pid; |
95954743 | 958 | ptid_t ptid; |
03583c20 | 959 | |
41272101 TT |
960 | { |
961 | maybe_disable_address_space_randomization restore_personality | |
c12a5089 | 962 | (cs.disable_randomization); |
bea571eb | 963 | std::string str_program_args = construct_inferior_arguments (program_args); |
41272101 TT |
964 | |
965 | pid = fork_inferior (program, | |
966 | str_program_args.c_str (), | |
967 | get_environ ()->envp (), linux_ptrace_fun, | |
968 | NULL, NULL, NULL, NULL); | |
969 | } | |
03583c20 | 970 | |
fd000fb3 | 971 | add_linux_process (pid, 0); |
95954743 | 972 | |
fd79271b | 973 | ptid = ptid_t (pid, pid, 0); |
95954743 | 974 | new_lwp = add_lwp (ptid); |
a6dbe5df | 975 | new_lwp->must_set_ptrace_flags = 1; |
611cb4a5 | 976 | |
2090129c SDJ |
977 | post_fork_inferior (pid, program); |
978 | ||
a9fa9f7d | 979 | return pid; |
da6d8c04 DJ |
980 | } |
981 | ||
ece66d65 JS |
982 | /* Implement the post_create_inferior target_ops method. */ |
983 | ||
6dee9afb TBA |
984 | void |
985 | linux_process_target::post_create_inferior () | |
ece66d65 JS |
986 | { |
987 | struct lwp_info *lwp = get_thread_lwp (current_thread); | |
988 | ||
797bcff5 | 989 | low_arch_setup (); |
ece66d65 JS |
990 | |
991 | if (lwp->must_set_ptrace_flags) | |
992 | { | |
993 | struct process_info *proc = current_process (); | |
994 | int options = linux_low_ptrace_options (proc->attached); | |
995 | ||
996 | linux_enable_event_reporting (lwpid_of (current_thread), options); | |
997 | lwp->must_set_ptrace_flags = 0; | |
998 | } | |
999 | } | |
1000 | ||
7ae1a6a6 | 1001 | int |
fd000fb3 | 1002 | linux_process_target::attach_lwp (ptid_t ptid) |
da6d8c04 | 1003 | { |
54a0b537 | 1004 | struct lwp_info *new_lwp; |
e38504b3 | 1005 | int lwpid = ptid.lwp (); |
611cb4a5 | 1006 | |
b8e1b30e | 1007 | if (ptrace (PTRACE_ATTACH, lwpid, (PTRACE_TYPE_ARG3) 0, (PTRACE_TYPE_ARG4) 0) |
56f7af9c | 1008 | != 0) |
7ae1a6a6 | 1009 | return errno; |
24a09b5f | 1010 | |
b3312d80 | 1011 | new_lwp = add_lwp (ptid); |
0d62e5e8 | 1012 | |
a6dbe5df PA |
1013 | /* We need to wait for SIGSTOP before being able to make the next |
1014 | ptrace call on this LWP. */ | |
1015 | new_lwp->must_set_ptrace_flags = 1; | |
1016 | ||
644cebc9 | 1017 | if (linux_proc_pid_is_stopped (lwpid)) |
c14d7ab2 PA |
1018 | { |
1019 | if (debug_threads) | |
87ce2a04 | 1020 | debug_printf ("Attached to a stopped process\n"); |
c14d7ab2 PA |
1021 | |
1022 | /* The process is definitely stopped. It is in a job control | |
1023 | stop, unless the kernel predates the TASK_STOPPED / | |
1024 | TASK_TRACED distinction, in which case it might be in a | |
1025 | ptrace stop. Make sure it is in a ptrace stop; from there we | |
1026 | can kill it, signal it, et cetera. | |
1027 | ||
1028 | First make sure there is a pending SIGSTOP. Since we are | |
1029 | already attached, the process can not transition from stopped | |
1030 | to running without a PTRACE_CONT; so we know this signal will | |
1031 | go into the queue. The SIGSTOP generated by PTRACE_ATTACH is | |
1032 | probably already in the queue (unless this kernel is old | |
1033 | enough to use TASK_STOPPED for ptrace stops); but since | |
1034 | SIGSTOP is not an RT signal, it can only be queued once. */ | |
1035 | kill_lwp (lwpid, SIGSTOP); | |
1036 | ||
1037 | /* Finally, resume the stopped process. This will deliver the | |
1038 | SIGSTOP (or a higher priority signal, just like normal | |
1039 | PTRACE_ATTACH), which we'll catch later on. */ | |
b8e1b30e | 1040 | ptrace (PTRACE_CONT, lwpid, (PTRACE_TYPE_ARG3) 0, (PTRACE_TYPE_ARG4) 0); |
c14d7ab2 PA |
1041 | } |
1042 | ||
0d62e5e8 | 1043 | /* The next time we wait for this LWP we'll see a SIGSTOP as PTRACE_ATTACH |
0e21c1ec DE |
1044 | brings it to a halt. |
1045 | ||
1046 | There are several cases to consider here: | |
1047 | ||
1048 | 1) gdbserver has already attached to the process and is being notified | |
1b3f6016 | 1049 | of a new thread that is being created. |
d50171e4 PA |
1050 | In this case we should ignore that SIGSTOP and resume the |
1051 | process. This is handled below by setting stop_expected = 1, | |
8336d594 | 1052 | and the fact that add_thread sets last_resume_kind == |
d50171e4 | 1053 | resume_continue. |
0e21c1ec DE |
1054 | |
1055 | 2) This is the first thread (the process thread), and we're attaching | |
1b3f6016 PA |
1056 | to it via attach_inferior. |
1057 | In this case we want the process thread to stop. | |
d50171e4 PA |
1058 | This is handled by having linux_attach set last_resume_kind == |
1059 | resume_stop after we return. | |
e3deef73 LM |
1060 | |
1061 | If the pid we are attaching to is also the tgid, we attach to and | |
1062 | stop all the existing threads. Otherwise, we attach to pid and | |
1063 | ignore any other threads in the same group as this pid. | |
0e21c1ec DE |
1064 | |
1065 | 3) GDB is connecting to gdbserver and is requesting an enumeration of all | |
1b3f6016 PA |
1066 | existing threads. |
1067 | In this case we want the thread to stop. | |
1068 | FIXME: This case is currently not properly handled. | |
1069 | We should wait for the SIGSTOP but don't. Things work apparently | |
1070 | because enough time passes between when we ptrace (ATTACH) and when | |
1071 | gdb makes the next ptrace call on the thread. | |
0d62e5e8 DJ |
1072 | |
1073 | On the other hand, if we are currently trying to stop all threads, we | |
1074 | should treat the new thread as if we had sent it a SIGSTOP. This works | |
54a0b537 | 1075 | because we are guaranteed that the add_lwp call above added us to the |
0e21c1ec DE |
1076 | end of the list, and so the new thread has not yet reached |
1077 | wait_for_sigstop (but will). */ | |
d50171e4 | 1078 | new_lwp->stop_expected = 1; |
0d62e5e8 | 1079 | |
7ae1a6a6 | 1080 | return 0; |
95954743 PA |
1081 | } |
1082 | ||
8784d563 PA |
1083 | /* Callback for linux_proc_attach_tgid_threads. Attach to PTID if not |
1084 | already attached. Returns true if a new LWP is found, false | |
1085 | otherwise. */ | |
1086 | ||
1087 | static int | |
1088 | attach_proc_task_lwp_callback (ptid_t ptid) | |
1089 | { | |
1090 | /* Is this a new thread? */ | |
1091 | if (find_thread_ptid (ptid) == NULL) | |
1092 | { | |
e38504b3 | 1093 | int lwpid = ptid.lwp (); |
8784d563 PA |
1094 | int err; |
1095 | ||
1096 | if (debug_threads) | |
1097 | debug_printf ("Found new lwp %d\n", lwpid); | |
1098 | ||
fd000fb3 | 1099 | err = the_linux_target->attach_lwp (ptid); |
8784d563 PA |
1100 | |
1101 | /* Be quiet if we simply raced with the thread exiting. EPERM | |
1102 | is returned if the thread's task still exists, and is marked | |
1103 | as exited or zombie, as well as other conditions, so in that | |
1104 | case, confirm the status in /proc/PID/status. */ | |
1105 | if (err == ESRCH | |
1106 | || (err == EPERM && linux_proc_pid_is_gone (lwpid))) | |
1107 | { | |
1108 | if (debug_threads) | |
1109 | { | |
1110 | debug_printf ("Cannot attach to lwp %d: " | |
1111 | "thread is gone (%d: %s)\n", | |
6d91ce9a | 1112 | lwpid, err, safe_strerror (err)); |
8784d563 PA |
1113 | } |
1114 | } | |
1115 | else if (err != 0) | |
1116 | { | |
4d9b86e1 | 1117 | std::string reason |
50fa3001 | 1118 | = linux_ptrace_attach_fail_reason_string (ptid, err); |
4d9b86e1 SM |
1119 | |
1120 | warning (_("Cannot attach to lwp %d: %s"), lwpid, reason.c_str ()); | |
8784d563 PA |
1121 | } |
1122 | ||
1123 | return 1; | |
1124 | } | |
1125 | return 0; | |
1126 | } | |
1127 | ||
500c1d85 PA |
1128 | static void async_file_mark (void); |
1129 | ||
e3deef73 LM |
1130 | /* Attach to PID. If PID is the tgid, attach to it and all |
1131 | of its threads. */ | |
1132 | ||
ef03dad8 TBA |
1133 | int |
1134 | linux_process_target::attach (unsigned long pid) | |
0d62e5e8 | 1135 | { |
500c1d85 PA |
1136 | struct process_info *proc; |
1137 | struct thread_info *initial_thread; | |
fd79271b | 1138 | ptid_t ptid = ptid_t (pid, pid, 0); |
7ae1a6a6 PA |
1139 | int err; |
1140 | ||
fd000fb3 | 1141 | proc = add_linux_process (pid, 1); |
df0da8a2 | 1142 | |
e3deef73 LM |
1143 | /* Attach to PID. We will check for other threads |
1144 | soon. */ | |
fd000fb3 | 1145 | err = attach_lwp (ptid); |
7ae1a6a6 | 1146 | if (err != 0) |
4d9b86e1 | 1147 | { |
df0da8a2 | 1148 | remove_process (proc); |
4d9b86e1 | 1149 | |
50fa3001 SDJ |
1150 | std::string reason = linux_ptrace_attach_fail_reason_string (ptid, err); |
1151 | error ("Cannot attach to process %ld: %s", pid, reason.c_str ()); | |
4d9b86e1 | 1152 | } |
7ae1a6a6 | 1153 | |
500c1d85 PA |
1154 | /* Don't ignore the initial SIGSTOP if we just attached to this |
1155 | process. It will be collected by wait shortly. */ | |
fd79271b | 1156 | initial_thread = find_thread_ptid (ptid_t (pid, pid, 0)); |
500c1d85 | 1157 | initial_thread->last_resume_kind = resume_stop; |
0d62e5e8 | 1158 | |
8784d563 PA |
1159 | /* We must attach to every LWP. If /proc is mounted, use that to |
1160 | find them now. On the one hand, the inferior may be using raw | |
1161 | clone instead of using pthreads. On the other hand, even if it | |
1162 | is using pthreads, GDB may not be connected yet (thread_db needs | |
1163 | to do symbol lookups, through qSymbol). Also, thread_db walks | |
1164 | structures in the inferior's address space to find the list of | |
1165 | threads/LWPs, and those structures may well be corrupted. Note | |
1166 | that once thread_db is loaded, we'll still use it to list threads | |
1167 | and associate pthread info with each LWP. */ | |
1168 | linux_proc_attach_tgid_threads (pid, attach_proc_task_lwp_callback); | |
500c1d85 PA |
1169 | |
1170 | /* GDB will shortly read the xml target description for this | |
1171 | process, to figure out the process' architecture. But the target | |
1172 | description is only filled in when the first process/thread in | |
1173 | the thread group reports its initial PTRACE_ATTACH SIGSTOP. Do | |
1174 | that now, otherwise, if GDB is fast enough, it could read the | |
1175 | target description _before_ that initial stop. */ | |
1176 | if (non_stop) | |
1177 | { | |
1178 | struct lwp_info *lwp; | |
1179 | int wstat, lwpid; | |
f2907e49 | 1180 | ptid_t pid_ptid = ptid_t (pid); |
500c1d85 | 1181 | |
d16f3f6c | 1182 | lwpid = wait_for_event_filtered (pid_ptid, pid_ptid, &wstat, __WALL); |
500c1d85 PA |
1183 | gdb_assert (lwpid > 0); |
1184 | ||
f2907e49 | 1185 | lwp = find_lwp_pid (ptid_t (lwpid)); |
500c1d85 PA |
1186 | |
1187 | if (!WIFSTOPPED (wstat) || WSTOPSIG (wstat) != SIGSTOP) | |
1188 | { | |
1189 | lwp->status_pending_p = 1; | |
1190 | lwp->status_pending = wstat; | |
1191 | } | |
1192 | ||
1193 | initial_thread->last_resume_kind = resume_continue; | |
1194 | ||
1195 | async_file_mark (); | |
1196 | ||
1197 | gdb_assert (proc->tdesc != NULL); | |
1198 | } | |
1199 | ||
95954743 PA |
1200 | return 0; |
1201 | } | |
1202 | ||
95954743 | 1203 | static int |
e4eb0dec | 1204 | last_thread_of_process_p (int pid) |
95954743 | 1205 | { |
e4eb0dec | 1206 | bool seen_one = false; |
95954743 | 1207 | |
da4ae14a | 1208 | thread_info *thread = find_thread (pid, [&] (thread_info *thr_arg) |
95954743 | 1209 | { |
e4eb0dec SM |
1210 | if (!seen_one) |
1211 | { | |
1212 | /* This is the first thread of this process we see. */ | |
1213 | seen_one = true; | |
1214 | return false; | |
1215 | } | |
1216 | else | |
1217 | { | |
1218 | /* This is the second thread of this process we see. */ | |
1219 | return true; | |
1220 | } | |
1221 | }); | |
da6d8c04 | 1222 | |
e4eb0dec | 1223 | return thread == NULL; |
95954743 PA |
1224 | } |
1225 | ||
da84f473 PA |
1226 | /* Kill LWP. */ |
1227 | ||
1228 | static void | |
1229 | linux_kill_one_lwp (struct lwp_info *lwp) | |
1230 | { | |
d86d4aaf DE |
1231 | struct thread_info *thr = get_lwp_thread (lwp); |
1232 | int pid = lwpid_of (thr); | |
da84f473 PA |
1233 | |
1234 | /* PTRACE_KILL is unreliable. After stepping into a signal handler, | |
1235 | there is no signal context, and ptrace(PTRACE_KILL) (or | |
1236 | ptrace(PTRACE_CONT, SIGKILL), pretty much the same) acts like | |
1237 | ptrace(CONT, pid, 0,0) and just resumes the tracee. A better | |
1238 | alternative is to kill with SIGKILL. We only need one SIGKILL | |
1239 | per process, not one for each thread. But since we still support | |
4a6ed09b PA |
1240 | support debugging programs using raw clone without CLONE_THREAD, |
1241 | we send one for each thread. For years, we used PTRACE_KILL | |
1242 | only, so we're being a bit paranoid about some old kernels where | |
1243 | PTRACE_KILL might work better (dubious if there are any such, but | |
1244 | that's why it's paranoia), so we try SIGKILL first, PTRACE_KILL | |
1245 | second, and so we're fine everywhere. */ | |
da84f473 PA |
1246 | |
1247 | errno = 0; | |
69ff6be5 | 1248 | kill_lwp (pid, SIGKILL); |
da84f473 | 1249 | if (debug_threads) |
ce9e3fe7 PA |
1250 | { |
1251 | int save_errno = errno; | |
1252 | ||
1253 | debug_printf ("LKL: kill_lwp (SIGKILL) %s, 0, 0 (%s)\n", | |
1254 | target_pid_to_str (ptid_of (thr)), | |
6d91ce9a | 1255 | save_errno ? safe_strerror (save_errno) : "OK"); |
ce9e3fe7 | 1256 | } |
da84f473 PA |
1257 | |
1258 | errno = 0; | |
b8e1b30e | 1259 | ptrace (PTRACE_KILL, pid, (PTRACE_TYPE_ARG3) 0, (PTRACE_TYPE_ARG4) 0); |
da84f473 | 1260 | if (debug_threads) |
ce9e3fe7 PA |
1261 | { |
1262 | int save_errno = errno; | |
1263 | ||
1264 | debug_printf ("LKL: PTRACE_KILL %s, 0, 0 (%s)\n", | |
1265 | target_pid_to_str (ptid_of (thr)), | |
6d91ce9a | 1266 | save_errno ? safe_strerror (save_errno) : "OK"); |
ce9e3fe7 | 1267 | } |
da84f473 PA |
1268 | } |
1269 | ||
e76126e8 PA |
1270 | /* Kill LWP and wait for it to die. */ |
1271 | ||
1272 | static void | |
1273 | kill_wait_lwp (struct lwp_info *lwp) | |
1274 | { | |
1275 | struct thread_info *thr = get_lwp_thread (lwp); | |
e99b03dc | 1276 | int pid = ptid_of (thr).pid (); |
e38504b3 | 1277 | int lwpid = ptid_of (thr).lwp (); |
e76126e8 PA |
1278 | int wstat; |
1279 | int res; | |
1280 | ||
1281 | if (debug_threads) | |
1282 | debug_printf ("kwl: killing lwp %d, for pid: %d\n", lwpid, pid); | |
1283 | ||
1284 | do | |
1285 | { | |
1286 | linux_kill_one_lwp (lwp); | |
1287 | ||
1288 | /* Make sure it died. Notes: | |
1289 | ||
1290 | - The loop is most likely unnecessary. | |
1291 | ||
d16f3f6c | 1292 | - We don't use wait_for_event as that could delete lwps |
e76126e8 PA |
1293 | while we're iterating over them. We're not interested in |
1294 | any pending status at this point, only in making sure all | |
1295 | wait status on the kernel side are collected until the | |
1296 | process is reaped. | |
1297 | ||
1298 | - We don't use __WALL here as the __WALL emulation relies on | |
1299 | SIGCHLD, and killing a stopped process doesn't generate | |
1300 | one, nor an exit status. | |
1301 | */ | |
1302 | res = my_waitpid (lwpid, &wstat, 0); | |
1303 | if (res == -1 && errno == ECHILD) | |
1304 | res = my_waitpid (lwpid, &wstat, __WCLONE); | |
1305 | } while (res > 0 && WIFSTOPPED (wstat)); | |
1306 | ||
586b02a9 PA |
1307 | /* Even if it was stopped, the child may have already disappeared. |
1308 | E.g., if it was killed by SIGKILL. */ | |
1309 | if (res < 0 && errno != ECHILD) | |
1310 | perror_with_name ("kill_wait_lwp"); | |
e76126e8 PA |
1311 | } |
1312 | ||
578290ec | 1313 | /* Callback for `for_each_thread'. Kills an lwp of a given process, |
da84f473 | 1314 | except the leader. */ |
95954743 | 1315 | |
578290ec SM |
1316 | static void |
1317 | kill_one_lwp_callback (thread_info *thread, int pid) | |
da6d8c04 | 1318 | { |
54a0b537 | 1319 | struct lwp_info *lwp = get_thread_lwp (thread); |
0d62e5e8 | 1320 | |
fd500816 DJ |
1321 | /* We avoid killing the first thread here, because of a Linux kernel (at |
1322 | least 2.6.0-test7 through 2.6.8-rc4) bug; if we kill the parent before | |
1323 | the children get a chance to be reaped, it will remain a zombie | |
1324 | forever. */ | |
95954743 | 1325 | |
d86d4aaf | 1326 | if (lwpid_of (thread) == pid) |
95954743 PA |
1327 | { |
1328 | if (debug_threads) | |
87ce2a04 | 1329 | debug_printf ("lkop: is last of process %s\n", |
9c80ecd6 | 1330 | target_pid_to_str (thread->id)); |
578290ec | 1331 | return; |
95954743 | 1332 | } |
fd500816 | 1333 | |
e76126e8 | 1334 | kill_wait_lwp (lwp); |
da6d8c04 DJ |
1335 | } |
1336 | ||
c6885a57 TBA |
1337 | int |
1338 | linux_process_target::kill (process_info *process) | |
0d62e5e8 | 1339 | { |
a780ef4f | 1340 | int pid = process->pid; |
9d606399 | 1341 | |
f9e39928 PA |
1342 | /* If we're killing a running inferior, make sure it is stopped |
1343 | first, as PTRACE_KILL will not work otherwise. */ | |
7984d532 | 1344 | stop_all_lwps (0, NULL); |
f9e39928 | 1345 | |
578290ec SM |
1346 | for_each_thread (pid, [&] (thread_info *thread) |
1347 | { | |
1348 | kill_one_lwp_callback (thread, pid); | |
1349 | }); | |
fd500816 | 1350 | |
54a0b537 | 1351 | /* See the comment in linux_kill_one_lwp. We did not kill the first |
fd500816 | 1352 | thread in the list, so do so now. */ |
a780ef4f | 1353 | lwp_info *lwp = find_lwp_pid (ptid_t (pid)); |
bd99dc85 | 1354 | |
784867a5 | 1355 | if (lwp == NULL) |
fd500816 | 1356 | { |
784867a5 | 1357 | if (debug_threads) |
d86d4aaf DE |
1358 | debug_printf ("lk_1: cannot find lwp for pid: %d\n", |
1359 | pid); | |
784867a5 JK |
1360 | } |
1361 | else | |
e76126e8 | 1362 | kill_wait_lwp (lwp); |
2d717e4f | 1363 | |
8adb37b9 | 1364 | mourn (process); |
f9e39928 PA |
1365 | |
1366 | /* Since we presently can only stop all lwps of all processes, we | |
1367 | need to unstop lwps of other processes. */ | |
7984d532 | 1368 | unstop_all_lwps (0, NULL); |
95954743 | 1369 | return 0; |
0d62e5e8 DJ |
1370 | } |
1371 | ||
9b224c5e PA |
1372 | /* Get pending signal of THREAD, for detaching purposes. This is the |
1373 | signal the thread last stopped for, which we need to deliver to the | |
1374 | thread when detaching, otherwise, it'd be suppressed/lost. */ | |
1375 | ||
1376 | static int | |
1377 | get_detach_signal (struct thread_info *thread) | |
1378 | { | |
c12a5089 | 1379 | client_state &cs = get_client_state (); |
a493e3e2 | 1380 | enum gdb_signal signo = GDB_SIGNAL_0; |
9b224c5e PA |
1381 | int status; |
1382 | struct lwp_info *lp = get_thread_lwp (thread); | |
1383 | ||
1384 | if (lp->status_pending_p) | |
1385 | status = lp->status_pending; | |
1386 | else | |
1387 | { | |
1388 | /* If the thread had been suspended by gdbserver, and it stopped | |
1389 | cleanly, then it'll have stopped with SIGSTOP. But we don't | |
1390 | want to deliver that SIGSTOP. */ | |
1391 | if (thread->last_status.kind != TARGET_WAITKIND_STOPPED | |
a493e3e2 | 1392 | || thread->last_status.value.sig == GDB_SIGNAL_0) |
9b224c5e PA |
1393 | return 0; |
1394 | ||
1395 | /* Otherwise, we may need to deliver the signal we | |
1396 | intercepted. */ | |
1397 | status = lp->last_status; | |
1398 | } | |
1399 | ||
1400 | if (!WIFSTOPPED (status)) | |
1401 | { | |
1402 | if (debug_threads) | |
87ce2a04 | 1403 | debug_printf ("GPS: lwp %s hasn't stopped: no pending signal\n", |
d86d4aaf | 1404 | target_pid_to_str (ptid_of (thread))); |
9b224c5e PA |
1405 | return 0; |
1406 | } | |
1407 | ||
1408 | /* Extended wait statuses aren't real SIGTRAPs. */ | |
89a5711c | 1409 | if (WSTOPSIG (status) == SIGTRAP && linux_is_extended_waitstatus (status)) |
9b224c5e PA |
1410 | { |
1411 | if (debug_threads) | |
87ce2a04 DE |
1412 | debug_printf ("GPS: lwp %s had stopped with extended " |
1413 | "status: no pending signal\n", | |
d86d4aaf | 1414 | target_pid_to_str (ptid_of (thread))); |
9b224c5e PA |
1415 | return 0; |
1416 | } | |
1417 | ||
2ea28649 | 1418 | signo = gdb_signal_from_host (WSTOPSIG (status)); |
9b224c5e | 1419 | |
c12a5089 | 1420 | if (cs.program_signals_p && !cs.program_signals[signo]) |
9b224c5e PA |
1421 | { |
1422 | if (debug_threads) | |
87ce2a04 | 1423 | debug_printf ("GPS: lwp %s had signal %s, but it is in nopass state\n", |
d86d4aaf | 1424 | target_pid_to_str (ptid_of (thread)), |
87ce2a04 | 1425 | gdb_signal_to_string (signo)); |
9b224c5e PA |
1426 | return 0; |
1427 | } | |
c12a5089 | 1428 | else if (!cs.program_signals_p |
9b224c5e PA |
1429 | /* If we have no way to know which signals GDB does not |
1430 | want to have passed to the program, assume | |
1431 | SIGTRAP/SIGINT, which is GDB's default. */ | |
a493e3e2 | 1432 | && (signo == GDB_SIGNAL_TRAP || signo == GDB_SIGNAL_INT)) |
9b224c5e PA |
1433 | { |
1434 | if (debug_threads) | |
87ce2a04 DE |
1435 | debug_printf ("GPS: lwp %s had signal %s, " |
1436 | "but we don't know if we should pass it. " | |
1437 | "Default to not.\n", | |
d86d4aaf | 1438 | target_pid_to_str (ptid_of (thread)), |
87ce2a04 | 1439 | gdb_signal_to_string (signo)); |
9b224c5e PA |
1440 | return 0; |
1441 | } | |
1442 | else | |
1443 | { | |
1444 | if (debug_threads) | |
87ce2a04 | 1445 | debug_printf ("GPS: lwp %s has pending signal %s: delivering it.\n", |
d86d4aaf | 1446 | target_pid_to_str (ptid_of (thread)), |
87ce2a04 | 1447 | gdb_signal_to_string (signo)); |
9b224c5e PA |
1448 | |
1449 | return WSTOPSIG (status); | |
1450 | } | |
1451 | } | |
1452 | ||
fd000fb3 TBA |
1453 | void |
1454 | linux_process_target::detach_one_lwp (lwp_info *lwp) | |
6ad8ae5c | 1455 | { |
ced2dffb | 1456 | struct thread_info *thread = get_lwp_thread (lwp); |
9b224c5e | 1457 | int sig; |
ced2dffb | 1458 | int lwpid; |
6ad8ae5c | 1459 | |
9b224c5e | 1460 | /* If there is a pending SIGSTOP, get rid of it. */ |
54a0b537 | 1461 | if (lwp->stop_expected) |
ae13219e | 1462 | { |
9b224c5e | 1463 | if (debug_threads) |
87ce2a04 | 1464 | debug_printf ("Sending SIGCONT to %s\n", |
d86d4aaf | 1465 | target_pid_to_str (ptid_of (thread))); |
9b224c5e | 1466 | |
d86d4aaf | 1467 | kill_lwp (lwpid_of (thread), SIGCONT); |
54a0b537 | 1468 | lwp->stop_expected = 0; |
ae13219e DJ |
1469 | } |
1470 | ||
9b224c5e PA |
1471 | /* Pass on any pending signal for this thread. */ |
1472 | sig = get_detach_signal (thread); | |
1473 | ||
ced2dffb PA |
1474 | /* Preparing to resume may try to write registers, and fail if the |
1475 | lwp is zombie. If that happens, ignore the error. We'll handle | |
1476 | it below, when detach fails with ESRCH. */ | |
a70b8144 | 1477 | try |
ced2dffb PA |
1478 | { |
1479 | /* Flush any pending changes to the process's registers. */ | |
1480 | regcache_invalidate_thread (thread); | |
1481 | ||
1482 | /* Finally, let it resume. */ | |
d7599cc0 | 1483 | low_prepare_to_resume (lwp); |
ced2dffb | 1484 | } |
230d2906 | 1485 | catch (const gdb_exception_error &ex) |
ced2dffb PA |
1486 | { |
1487 | if (!check_ptrace_stopped_lwp_gone (lwp)) | |
eedc3f4f | 1488 | throw; |
ced2dffb | 1489 | } |
ced2dffb PA |
1490 | |
1491 | lwpid = lwpid_of (thread); | |
1492 | if (ptrace (PTRACE_DETACH, lwpid, (PTRACE_TYPE_ARG3) 0, | |
b8e1b30e | 1493 | (PTRACE_TYPE_ARG4) (long) sig) < 0) |
ced2dffb PA |
1494 | { |
1495 | int save_errno = errno; | |
1496 | ||
1497 | /* We know the thread exists, so ESRCH must mean the lwp is | |
1498 | zombie. This can happen if one of the already-detached | |
1499 | threads exits the whole thread group. In that case we're | |
1500 | still attached, and must reap the lwp. */ | |
1501 | if (save_errno == ESRCH) | |
1502 | { | |
1503 | int ret, status; | |
1504 | ||
1505 | ret = my_waitpid (lwpid, &status, __WALL); | |
1506 | if (ret == -1) | |
1507 | { | |
1508 | warning (_("Couldn't reap LWP %d while detaching: %s"), | |
6d91ce9a | 1509 | lwpid, safe_strerror (errno)); |
ced2dffb PA |
1510 | } |
1511 | else if (!WIFEXITED (status) && !WIFSIGNALED (status)) | |
1512 | { | |
1513 | warning (_("Reaping LWP %d while detaching " | |
1514 | "returned unexpected status 0x%x"), | |
1515 | lwpid, status); | |
1516 | } | |
1517 | } | |
1518 | else | |
1519 | { | |
1520 | error (_("Can't detach %s: %s"), | |
1521 | target_pid_to_str (ptid_of (thread)), | |
6d91ce9a | 1522 | safe_strerror (save_errno)); |
ced2dffb PA |
1523 | } |
1524 | } | |
1525 | else if (debug_threads) | |
1526 | { | |
1527 | debug_printf ("PTRACE_DETACH (%s, %s, 0) (OK)\n", | |
1528 | target_pid_to_str (ptid_of (thread)), | |
1529 | strsignal (sig)); | |
1530 | } | |
bd99dc85 PA |
1531 | |
1532 | delete_lwp (lwp); | |
ced2dffb PA |
1533 | } |
1534 | ||
9061c9cf TBA |
1535 | int |
1536 | linux_process_target::detach (process_info *process) | |
95954743 | 1537 | { |
ced2dffb | 1538 | struct lwp_info *main_lwp; |
95954743 | 1539 | |
863d01bd PA |
1540 | /* As there's a step over already in progress, let it finish first, |
1541 | otherwise nesting a stabilize_threads operation on top gets real | |
1542 | messy. */ | |
1543 | complete_ongoing_step_over (); | |
1544 | ||
f9e39928 | 1545 | /* Stop all threads before detaching. First, ptrace requires that |
30baf67b | 1546 | the thread is stopped to successfully detach. Second, thread_db |
f9e39928 PA |
1547 | may need to uninstall thread event breakpoints from memory, which |
1548 | only works with a stopped process anyway. */ | |
7984d532 | 1549 | stop_all_lwps (0, NULL); |
f9e39928 | 1550 | |
ca5c370d | 1551 | #ifdef USE_THREAD_DB |
8336d594 | 1552 | thread_db_detach (process); |
ca5c370d PA |
1553 | #endif |
1554 | ||
fa593d66 | 1555 | /* Stabilize threads (move out of jump pads). */ |
5c9eb2f2 | 1556 | target_stabilize_threads (); |
fa593d66 | 1557 | |
ced2dffb PA |
1558 | /* Detach from the clone lwps first. If the thread group exits just |
1559 | while we're detaching, we must reap the clone lwps before we're | |
1560 | able to reap the leader. */ | |
fd000fb3 TBA |
1561 | for_each_thread (process->pid, [this] (thread_info *thread) |
1562 | { | |
1563 | /* We don't actually detach from the thread group leader just yet. | |
1564 | If the thread group exits, we must reap the zombie clone lwps | |
1565 | before we're able to reap the leader. */ | |
1566 | if (thread->id.pid () == thread->id.lwp ()) | |
1567 | return; | |
1568 | ||
1569 | lwp_info *lwp = get_thread_lwp (thread); | |
1570 | detach_one_lwp (lwp); | |
1571 | }); | |
ced2dffb | 1572 | |
ef2ddb33 | 1573 | main_lwp = find_lwp_pid (ptid_t (process->pid)); |
fd000fb3 | 1574 | detach_one_lwp (main_lwp); |
8336d594 | 1575 | |
8adb37b9 | 1576 | mourn (process); |
f9e39928 PA |
1577 | |
1578 | /* Since we presently can only stop all lwps of all processes, we | |
1579 | need to unstop lwps of other processes. */ | |
7984d532 | 1580 | unstop_all_lwps (0, NULL); |
f9e39928 PA |
1581 | return 0; |
1582 | } | |
1583 | ||
1584 | /* Remove all LWPs that belong to process PROC from the lwp list. */ | |
1585 | ||
8adb37b9 TBA |
1586 | void |
1587 | linux_process_target::mourn (process_info *process) | |
8336d594 PA |
1588 | { |
1589 | struct process_info_private *priv; | |
1590 | ||
1591 | #ifdef USE_THREAD_DB | |
1592 | thread_db_mourn (process); | |
1593 | #endif | |
1594 | ||
fd000fb3 | 1595 | for_each_thread (process->pid, [this] (thread_info *thread) |
6b2a85da SM |
1596 | { |
1597 | delete_lwp (get_thread_lwp (thread)); | |
1598 | }); | |
f9e39928 | 1599 | |
8336d594 | 1600 | /* Freeing all private data. */ |
fe978cb0 | 1601 | priv = process->priv; |
fd000fb3 | 1602 | low_delete_process (priv->arch_private); |
8336d594 | 1603 | free (priv); |
fe978cb0 | 1604 | process->priv = NULL; |
505106cd PA |
1605 | |
1606 | remove_process (process); | |
8336d594 PA |
1607 | } |
1608 | ||
95a49a39 TBA |
1609 | void |
1610 | linux_process_target::join (int pid) | |
444d6139 | 1611 | { |
444d6139 PA |
1612 | int status, ret; |
1613 | ||
1614 | do { | |
d105de22 | 1615 | ret = my_waitpid (pid, &status, 0); |
444d6139 PA |
1616 | if (WIFEXITED (status) || WIFSIGNALED (status)) |
1617 | break; | |
1618 | } while (ret != -1 || errno != ECHILD); | |
1619 | } | |
1620 | ||
13d3d99b TBA |
1621 | /* Return true if the given thread is still alive. */ |
1622 | ||
1623 | bool | |
1624 | linux_process_target::thread_alive (ptid_t ptid) | |
0d62e5e8 | 1625 | { |
95954743 PA |
1626 | struct lwp_info *lwp = find_lwp_pid (ptid); |
1627 | ||
1628 | /* We assume we always know if a thread exits. If a whole process | |
1629 | exited but we still haven't been able to report it to GDB, we'll | |
1630 | hold on to the last lwp of the dead process. */ | |
1631 | if (lwp != NULL) | |
00db26fa | 1632 | return !lwp_is_marked_dead (lwp); |
0d62e5e8 DJ |
1633 | else |
1634 | return 0; | |
1635 | } | |
1636 | ||
df95181f TBA |
1637 | bool |
1638 | linux_process_target::thread_still_has_status_pending (thread_info *thread) | |
582511be PA |
1639 | { |
1640 | struct lwp_info *lp = get_thread_lwp (thread); | |
1641 | ||
1642 | if (!lp->status_pending_p) | |
1643 | return 0; | |
1644 | ||
582511be | 1645 | if (thread->last_resume_kind != resume_stop |
15c66dd6 PA |
1646 | && (lp->stop_reason == TARGET_STOPPED_BY_SW_BREAKPOINT |
1647 | || lp->stop_reason == TARGET_STOPPED_BY_HW_BREAKPOINT)) | |
582511be PA |
1648 | { |
1649 | struct thread_info *saved_thread; | |
1650 | CORE_ADDR pc; | |
1651 | int discard = 0; | |
1652 | ||
1653 | gdb_assert (lp->last_status != 0); | |
1654 | ||
1655 | pc = get_pc (lp); | |
1656 | ||
1657 | saved_thread = current_thread; | |
1658 | current_thread = thread; | |
1659 | ||
1660 | if (pc != lp->stop_pc) | |
1661 | { | |
1662 | if (debug_threads) | |
1663 | debug_printf ("PC of %ld changed\n", | |
1664 | lwpid_of (thread)); | |
1665 | discard = 1; | |
1666 | } | |
3e572f71 PA |
1667 | |
1668 | #if !USE_SIGTRAP_SIGINFO | |
15c66dd6 | 1669 | else if (lp->stop_reason == TARGET_STOPPED_BY_SW_BREAKPOINT |
d7146cda | 1670 | && !low_breakpoint_at (pc)) |
582511be PA |
1671 | { |
1672 | if (debug_threads) | |
1673 | debug_printf ("previous SW breakpoint of %ld gone\n", | |
1674 | lwpid_of (thread)); | |
1675 | discard = 1; | |
1676 | } | |
15c66dd6 | 1677 | else if (lp->stop_reason == TARGET_STOPPED_BY_HW_BREAKPOINT |
582511be PA |
1678 | && !hardware_breakpoint_inserted_here (pc)) |
1679 | { | |
1680 | if (debug_threads) | |
1681 | debug_printf ("previous HW breakpoint of %ld gone\n", | |
1682 | lwpid_of (thread)); | |
1683 | discard = 1; | |
1684 | } | |
3e572f71 | 1685 | #endif |
582511be PA |
1686 | |
1687 | current_thread = saved_thread; | |
1688 | ||
1689 | if (discard) | |
1690 | { | |
1691 | if (debug_threads) | |
1692 | debug_printf ("discarding pending breakpoint status\n"); | |
1693 | lp->status_pending_p = 0; | |
1694 | return 0; | |
1695 | } | |
1696 | } | |
1697 | ||
1698 | return 1; | |
1699 | } | |
1700 | ||
a681f9c9 PA |
1701 | /* Returns true if LWP is resumed from the client's perspective. */ |
1702 | ||
1703 | static int | |
1704 | lwp_resumed (struct lwp_info *lwp) | |
1705 | { | |
1706 | struct thread_info *thread = get_lwp_thread (lwp); | |
1707 | ||
1708 | if (thread->last_resume_kind != resume_stop) | |
1709 | return 1; | |
1710 | ||
1711 | /* Did gdb send us a `vCont;t', but we haven't reported the | |
1712 | corresponding stop to gdb yet? If so, the thread is still | |
1713 | resumed/running from gdb's perspective. */ | |
1714 | if (thread->last_resume_kind == resume_stop | |
1715 | && thread->last_status.kind == TARGET_WAITKIND_IGNORE) | |
1716 | return 1; | |
1717 | ||
1718 | return 0; | |
1719 | } | |
1720 | ||
df95181f TBA |
1721 | bool |
1722 | linux_process_target::status_pending_p_callback (thread_info *thread, | |
1723 | ptid_t ptid) | |
0d62e5e8 | 1724 | { |
582511be | 1725 | struct lwp_info *lp = get_thread_lwp (thread); |
95954743 PA |
1726 | |
1727 | /* Check if we're only interested in events from a specific process | |
afa8d396 | 1728 | or a specific LWP. */ |
83e1b6c1 | 1729 | if (!thread->id.matches (ptid)) |
95954743 | 1730 | return 0; |
0d62e5e8 | 1731 | |
a681f9c9 PA |
1732 | if (!lwp_resumed (lp)) |
1733 | return 0; | |
1734 | ||
582511be | 1735 | if (lp->status_pending_p |
df95181f | 1736 | && !thread_still_has_status_pending (thread)) |
582511be | 1737 | { |
df95181f | 1738 | resume_one_lwp (lp, lp->stepping, GDB_SIGNAL_0, NULL); |
582511be PA |
1739 | return 0; |
1740 | } | |
0d62e5e8 | 1741 | |
582511be | 1742 | return lp->status_pending_p; |
0d62e5e8 DJ |
1743 | } |
1744 | ||
95954743 PA |
1745 | struct lwp_info * |
1746 | find_lwp_pid (ptid_t ptid) | |
1747 | { | |
da4ae14a | 1748 | thread_info *thread = find_thread ([&] (thread_info *thr_arg) |
454296a2 SM |
1749 | { |
1750 | int lwp = ptid.lwp () != 0 ? ptid.lwp () : ptid.pid (); | |
da4ae14a | 1751 | return thr_arg->id.lwp () == lwp; |
454296a2 | 1752 | }); |
d86d4aaf DE |
1753 | |
1754 | if (thread == NULL) | |
1755 | return NULL; | |
1756 | ||
9c80ecd6 | 1757 | return get_thread_lwp (thread); |
95954743 PA |
1758 | } |
1759 | ||
fa96cb38 | 1760 | /* Return the number of known LWPs in the tgid given by PID. */ |
0d62e5e8 | 1761 | |
fa96cb38 PA |
1762 | static int |
1763 | num_lwps (int pid) | |
1764 | { | |
fa96cb38 | 1765 | int count = 0; |
0d62e5e8 | 1766 | |
4d3bb80e SM |
1767 | for_each_thread (pid, [&] (thread_info *thread) |
1768 | { | |
9c80ecd6 | 1769 | count++; |
4d3bb80e | 1770 | }); |
3aee8918 | 1771 | |
fa96cb38 PA |
1772 | return count; |
1773 | } | |
d61ddec4 | 1774 | |
6d4ee8c6 GB |
1775 | /* See nat/linux-nat.h. */ |
1776 | ||
1777 | struct lwp_info * | |
1778 | iterate_over_lwps (ptid_t filter, | |
d3a70e03 | 1779 | gdb::function_view<iterate_over_lwps_ftype> callback) |
6d4ee8c6 | 1780 | { |
da4ae14a | 1781 | thread_info *thread = find_thread (filter, [&] (thread_info *thr_arg) |
6d1e5673 | 1782 | { |
da4ae14a | 1783 | lwp_info *lwp = get_thread_lwp (thr_arg); |
6d1e5673 | 1784 | |
d3a70e03 | 1785 | return callback (lwp); |
6d1e5673 | 1786 | }); |
6d4ee8c6 | 1787 | |
9c80ecd6 | 1788 | if (thread == NULL) |
6d4ee8c6 GB |
1789 | return NULL; |
1790 | ||
9c80ecd6 | 1791 | return get_thread_lwp (thread); |
6d4ee8c6 GB |
1792 | } |
1793 | ||
fd000fb3 TBA |
1794 | void |
1795 | linux_process_target::check_zombie_leaders () | |
fa96cb38 | 1796 | { |
fd000fb3 | 1797 | for_each_process ([this] (process_info *proc) { |
9179355e SM |
1798 | pid_t leader_pid = pid_of (proc); |
1799 | struct lwp_info *leader_lp; | |
1800 | ||
f2907e49 | 1801 | leader_lp = find_lwp_pid (ptid_t (leader_pid)); |
9179355e SM |
1802 | |
1803 | if (debug_threads) | |
1804 | debug_printf ("leader_pid=%d, leader_lp!=NULL=%d, " | |
1805 | "num_lwps=%d, zombie=%d\n", | |
1806 | leader_pid, leader_lp!= NULL, num_lwps (leader_pid), | |
1807 | linux_proc_pid_is_zombie (leader_pid)); | |
1808 | ||
1809 | if (leader_lp != NULL && !leader_lp->stopped | |
1810 | /* Check if there are other threads in the group, as we may | |
1811 | have raced with the inferior simply exiting. */ | |
1812 | && !last_thread_of_process_p (leader_pid) | |
1813 | && linux_proc_pid_is_zombie (leader_pid)) | |
1814 | { | |
1815 | /* A leader zombie can mean one of two things: | |
1816 | ||
1817 | - It exited, and there's an exit status pending | |
1818 | available, or only the leader exited (not the whole | |
1819 | program). In the latter case, we can't waitpid the | |
1820 | leader's exit status until all other threads are gone. | |
1821 | ||
1822 | - There are 3 or more threads in the group, and a thread | |
1823 | other than the leader exec'd. On an exec, the Linux | |
1824 | kernel destroys all other threads (except the execing | |
1825 | one) in the thread group, and resets the execing thread's | |
1826 | tid to the tgid. No exit notification is sent for the | |
1827 | execing thread -- from the ptracer's perspective, it | |
1828 | appears as though the execing thread just vanishes. | |
1829 | Until we reap all other threads except the leader and the | |
1830 | execing thread, the leader will be zombie, and the | |
1831 | execing thread will be in `D (disc sleep)'. As soon as | |
1832 | all other threads are reaped, the execing thread changes | |
1833 | it's tid to the tgid, and the previous (zombie) leader | |
1834 | vanishes, giving place to the "new" leader. We could try | |
1835 | distinguishing the exit and exec cases, by waiting once | |
1836 | more, and seeing if something comes out, but it doesn't | |
1837 | sound useful. The previous leader _does_ go away, and | |
1838 | we'll re-add the new one once we see the exec event | |
1839 | (which is just the same as what would happen if the | |
1840 | previous leader did exit voluntarily before some other | |
1841 | thread execs). */ | |
1842 | ||
1843 | if (debug_threads) | |
1844 | debug_printf ("CZL: Thread group leader %d zombie " | |
1845 | "(it exited, or another thread execd).\n", | |
1846 | leader_pid); | |
1847 | ||
1848 | delete_lwp (leader_lp); | |
1849 | } | |
1850 | }); | |
fa96cb38 | 1851 | } |
c3adc08c | 1852 | |
a1385b7b SM |
1853 | /* Callback for `find_thread'. Returns the first LWP that is not |
1854 | stopped. */ | |
d50171e4 | 1855 | |
a1385b7b SM |
1856 | static bool |
1857 | not_stopped_callback (thread_info *thread, ptid_t filter) | |
fa96cb38 | 1858 | { |
a1385b7b SM |
1859 | if (!thread->id.matches (filter)) |
1860 | return false; | |
47c0c975 | 1861 | |
a1385b7b | 1862 | lwp_info *lwp = get_thread_lwp (thread); |
fa96cb38 | 1863 | |
a1385b7b | 1864 | return !lwp->stopped; |
0d62e5e8 | 1865 | } |
611cb4a5 | 1866 | |
863d01bd PA |
1867 | /* Increment LWP's suspend count. */ |
1868 | ||
1869 | static void | |
1870 | lwp_suspended_inc (struct lwp_info *lwp) | |
1871 | { | |
1872 | lwp->suspended++; | |
1873 | ||
1874 | if (debug_threads && lwp->suspended > 4) | |
1875 | { | |
1876 | struct thread_info *thread = get_lwp_thread (lwp); | |
1877 | ||
1878 | debug_printf ("LWP %ld has a suspiciously high suspend count," | |
1879 | " suspended=%d\n", lwpid_of (thread), lwp->suspended); | |
1880 | } | |
1881 | } | |
1882 | ||
1883 | /* Decrement LWP's suspend count. */ | |
1884 | ||
1885 | static void | |
1886 | lwp_suspended_decr (struct lwp_info *lwp) | |
1887 | { | |
1888 | lwp->suspended--; | |
1889 | ||
1890 | if (lwp->suspended < 0) | |
1891 | { | |
1892 | struct thread_info *thread = get_lwp_thread (lwp); | |
1893 | ||
1894 | internal_error (__FILE__, __LINE__, | |
1895 | "unsuspend LWP %ld, suspended=%d\n", lwpid_of (thread), | |
1896 | lwp->suspended); | |
1897 | } | |
1898 | } | |
1899 | ||
219f2f23 PA |
1900 | /* This function should only be called if the LWP got a SIGTRAP. |
1901 | ||
1902 | Handle any tracepoint steps or hits. Return true if a tracepoint | |
1903 | event was handled, 0 otherwise. */ | |
1904 | ||
1905 | static int | |
1906 | handle_tracepoints (struct lwp_info *lwp) | |
1907 | { | |
1908 | struct thread_info *tinfo = get_lwp_thread (lwp); | |
1909 | int tpoint_related_event = 0; | |
1910 | ||
582511be PA |
1911 | gdb_assert (lwp->suspended == 0); |
1912 | ||
7984d532 PA |
1913 | /* If this tracepoint hit causes a tracing stop, we'll immediately |
1914 | uninsert tracepoints. To do this, we temporarily pause all | |
1915 | threads, unpatch away, and then unpause threads. We need to make | |
1916 | sure the unpausing doesn't resume LWP too. */ | |
863d01bd | 1917 | lwp_suspended_inc (lwp); |
7984d532 | 1918 | |
219f2f23 PA |
1919 | /* And we need to be sure that any all-threads-stopping doesn't try |
1920 | to move threads out of the jump pads, as it could deadlock the | |
1921 | inferior (LWP could be in the jump pad, maybe even holding the | |
1922 | lock.) */ | |
1923 | ||
1924 | /* Do any necessary step collect actions. */ | |
1925 | tpoint_related_event |= tracepoint_finished_step (tinfo, lwp->stop_pc); | |
1926 | ||
fa593d66 PA |
1927 | tpoint_related_event |= handle_tracepoint_bkpts (tinfo, lwp->stop_pc); |
1928 | ||
219f2f23 PA |
1929 | /* See if we just hit a tracepoint and do its main collect |
1930 | actions. */ | |
1931 | tpoint_related_event |= tracepoint_was_hit (tinfo, lwp->stop_pc); | |
1932 | ||
863d01bd | 1933 | lwp_suspended_decr (lwp); |
7984d532 PA |
1934 | |
1935 | gdb_assert (lwp->suspended == 0); | |
229d26fc SM |
1936 | gdb_assert (!stabilizing_threads |
1937 | || (lwp->collecting_fast_tracepoint | |
1938 | != fast_tpoint_collect_result::not_collecting)); | |
7984d532 | 1939 | |
219f2f23 PA |
1940 | if (tpoint_related_event) |
1941 | { | |
1942 | if (debug_threads) | |
87ce2a04 | 1943 | debug_printf ("got a tracepoint event\n"); |
219f2f23 PA |
1944 | return 1; |
1945 | } | |
1946 | ||
1947 | return 0; | |
1948 | } | |
1949 | ||
13e567af TBA |
1950 | fast_tpoint_collect_result |
1951 | linux_process_target::linux_fast_tracepoint_collecting | |
1952 | (lwp_info *lwp, fast_tpoint_collect_status *status) | |
fa593d66 PA |
1953 | { |
1954 | CORE_ADDR thread_area; | |
d86d4aaf | 1955 | struct thread_info *thread = get_lwp_thread (lwp); |
fa593d66 | 1956 | |
fa593d66 PA |
1957 | /* Get the thread area address. This is used to recognize which |
1958 | thread is which when tracing with the in-process agent library. | |
1959 | We don't read anything from the address, and treat it as opaque; | |
1960 | it's the address itself that we assume is unique per-thread. */ | |
13e567af | 1961 | if (low_get_thread_area (lwpid_of (thread), &thread_area) == -1) |
229d26fc | 1962 | return fast_tpoint_collect_result::not_collecting; |
fa593d66 PA |
1963 | |
1964 | return fast_tracepoint_collecting (thread_area, lwp->stop_pc, status); | |
1965 | } | |
1966 | ||
13e567af TBA |
1967 | int |
1968 | linux_process_target::low_get_thread_area (int lwpid, CORE_ADDR *addrp) | |
1969 | { | |
1970 | return -1; | |
1971 | } | |
1972 | ||
d16f3f6c TBA |
1973 | bool |
1974 | linux_process_target::maybe_move_out_of_jump_pad (lwp_info *lwp, int *wstat) | |
fa593d66 | 1975 | { |
0bfdf32f | 1976 | struct thread_info *saved_thread; |
fa593d66 | 1977 | |
0bfdf32f GB |
1978 | saved_thread = current_thread; |
1979 | current_thread = get_lwp_thread (lwp); | |
fa593d66 PA |
1980 | |
1981 | if ((wstat == NULL | |
1982 | || (WIFSTOPPED (*wstat) && WSTOPSIG (*wstat) != SIGTRAP)) | |
1983 | && supports_fast_tracepoints () | |
58b4daa5 | 1984 | && agent_loaded_p ()) |
fa593d66 PA |
1985 | { |
1986 | struct fast_tpoint_collect_status status; | |
fa593d66 PA |
1987 | |
1988 | if (debug_threads) | |
87ce2a04 DE |
1989 | debug_printf ("Checking whether LWP %ld needs to move out of the " |
1990 | "jump pad.\n", | |
0bfdf32f | 1991 | lwpid_of (current_thread)); |
fa593d66 | 1992 | |
229d26fc SM |
1993 | fast_tpoint_collect_result r |
1994 | = linux_fast_tracepoint_collecting (lwp, &status); | |
fa593d66 PA |
1995 | |
1996 | if (wstat == NULL | |
1997 | || (WSTOPSIG (*wstat) != SIGILL | |
1998 | && WSTOPSIG (*wstat) != SIGFPE | |
1999 | && WSTOPSIG (*wstat) != SIGSEGV | |
2000 | && WSTOPSIG (*wstat) != SIGBUS)) | |
2001 | { | |
2002 | lwp->collecting_fast_tracepoint = r; | |
2003 | ||
229d26fc | 2004 | if (r != fast_tpoint_collect_result::not_collecting) |
fa593d66 | 2005 | { |
229d26fc SM |
2006 | if (r == fast_tpoint_collect_result::before_insn |
2007 | && lwp->exit_jump_pad_bkpt == NULL) | |
fa593d66 PA |
2008 | { |
2009 | /* Haven't executed the original instruction yet. | |
2010 | Set breakpoint there, and wait till it's hit, | |
2011 | then single-step until exiting the jump pad. */ | |
2012 | lwp->exit_jump_pad_bkpt | |
2013 | = set_breakpoint_at (status.adjusted_insn_addr, NULL); | |
2014 | } | |
2015 | ||
2016 | if (debug_threads) | |
87ce2a04 DE |
2017 | debug_printf ("Checking whether LWP %ld needs to move out of " |
2018 | "the jump pad...it does\n", | |
0bfdf32f GB |
2019 | lwpid_of (current_thread)); |
2020 | current_thread = saved_thread; | |
fa593d66 | 2021 | |
d16f3f6c | 2022 | return true; |
fa593d66 PA |
2023 | } |
2024 | } | |
2025 | else | |
2026 | { | |
2027 | /* If we get a synchronous signal while collecting, *and* | |
2028 | while executing the (relocated) original instruction, | |
2029 | reset the PC to point at the tpoint address, before | |
2030 | reporting to GDB. Otherwise, it's an IPA lib bug: just | |
2031 | report the signal to GDB, and pray for the best. */ | |
2032 | ||
229d26fc SM |
2033 | lwp->collecting_fast_tracepoint |
2034 | = fast_tpoint_collect_result::not_collecting; | |
fa593d66 | 2035 | |
229d26fc | 2036 | if (r != fast_tpoint_collect_result::not_collecting |
fa593d66 PA |
2037 | && (status.adjusted_insn_addr <= lwp->stop_pc |
2038 | && lwp->stop_pc < status.adjusted_insn_addr_end)) | |
2039 | { | |
2040 | siginfo_t info; | |
2041 | struct regcache *regcache; | |
2042 | ||
2043 | /* The si_addr on a few signals references the address | |
2044 | of the faulting instruction. Adjust that as | |
2045 | well. */ | |
2046 | if ((WSTOPSIG (*wstat) == SIGILL | |
2047 | || WSTOPSIG (*wstat) == SIGFPE | |
2048 | || WSTOPSIG (*wstat) == SIGBUS | |
2049 | || WSTOPSIG (*wstat) == SIGSEGV) | |
0bfdf32f | 2050 | && ptrace (PTRACE_GETSIGINFO, lwpid_of (current_thread), |
b8e1b30e | 2051 | (PTRACE_TYPE_ARG3) 0, &info) == 0 |
fa593d66 PA |
2052 | /* Final check just to make sure we don't clobber |
2053 | the siginfo of non-kernel-sent signals. */ | |
2054 | && (uintptr_t) info.si_addr == lwp->stop_pc) | |
2055 | { | |
2056 | info.si_addr = (void *) (uintptr_t) status.tpoint_addr; | |
0bfdf32f | 2057 | ptrace (PTRACE_SETSIGINFO, lwpid_of (current_thread), |
b8e1b30e | 2058 | (PTRACE_TYPE_ARG3) 0, &info); |
fa593d66 PA |
2059 | } |
2060 | ||
0bfdf32f | 2061 | regcache = get_thread_regcache (current_thread, 1); |
bf9ae9d8 | 2062 | low_set_pc (regcache, status.tpoint_addr); |
fa593d66 PA |
2063 | lwp->stop_pc = status.tpoint_addr; |
2064 | ||
2065 | /* Cancel any fast tracepoint lock this thread was | |
2066 | holding. */ | |
2067 | force_unlock_trace_buffer (); | |
2068 | } | |
2069 | ||
2070 | if (lwp->exit_jump_pad_bkpt != NULL) | |
2071 | { | |
2072 | if (debug_threads) | |
87ce2a04 DE |
2073 | debug_printf ("Cancelling fast exit-jump-pad: removing bkpt. " |
2074 | "stopping all threads momentarily.\n"); | |
fa593d66 PA |
2075 | |
2076 | stop_all_lwps (1, lwp); | |
fa593d66 PA |
2077 | |
2078 | delete_breakpoint (lwp->exit_jump_pad_bkpt); | |
2079 | lwp->exit_jump_pad_bkpt = NULL; | |
2080 | ||
2081 | unstop_all_lwps (1, lwp); | |
2082 | ||
2083 | gdb_assert (lwp->suspended >= 0); | |
2084 | } | |
2085 | } | |
2086 | } | |
2087 | ||
2088 | if (debug_threads) | |
87ce2a04 DE |
2089 | debug_printf ("Checking whether LWP %ld needs to move out of the " |
2090 | "jump pad...no\n", | |
0bfdf32f | 2091 | lwpid_of (current_thread)); |
0cccb683 | 2092 | |
0bfdf32f | 2093 | current_thread = saved_thread; |
d16f3f6c | 2094 | return false; |
fa593d66 PA |
2095 | } |
2096 | ||
2097 | /* Enqueue one signal in the "signals to report later when out of the | |
2098 | jump pad" list. */ | |
2099 | ||
2100 | static void | |
2101 | enqueue_one_deferred_signal (struct lwp_info *lwp, int *wstat) | |
2102 | { | |
d86d4aaf | 2103 | struct thread_info *thread = get_lwp_thread (lwp); |
fa593d66 PA |
2104 | |
2105 | if (debug_threads) | |
87ce2a04 | 2106 | debug_printf ("Deferring signal %d for LWP %ld.\n", |
d86d4aaf | 2107 | WSTOPSIG (*wstat), lwpid_of (thread)); |
fa593d66 PA |
2108 | |
2109 | if (debug_threads) | |
2110 | { | |
013e3554 | 2111 | for (const auto &sig : lwp->pending_signals_to_report) |
87ce2a04 | 2112 | debug_printf (" Already queued %d\n", |
013e3554 | 2113 | sig.signal); |
fa593d66 | 2114 | |
87ce2a04 | 2115 | debug_printf (" (no more currently queued signals)\n"); |
fa593d66 PA |
2116 | } |
2117 | ||
1a981360 PA |
2118 | /* Don't enqueue non-RT signals if they are already in the deferred |
2119 | queue. (SIGSTOP being the easiest signal to see ending up here | |
2120 | twice) */ | |
2121 | if (WSTOPSIG (*wstat) < __SIGRTMIN) | |
2122 | { | |
013e3554 | 2123 | for (const auto &sig : lwp->pending_signals_to_report) |
1a981360 | 2124 | { |
013e3554 | 2125 | if (sig.signal == WSTOPSIG (*wstat)) |
1a981360 PA |
2126 | { |
2127 | if (debug_threads) | |
87ce2a04 DE |
2128 | debug_printf ("Not requeuing already queued non-RT signal %d" |
2129 | " for LWP %ld\n", | |
013e3554 | 2130 | sig.signal, |
d86d4aaf | 2131 | lwpid_of (thread)); |
1a981360 PA |
2132 | return; |
2133 | } | |
2134 | } | |
2135 | } | |
2136 | ||
013e3554 | 2137 | lwp->pending_signals_to_report.emplace_back (WSTOPSIG (*wstat)); |
8d749320 | 2138 | |
d86d4aaf | 2139 | ptrace (PTRACE_GETSIGINFO, lwpid_of (thread), (PTRACE_TYPE_ARG3) 0, |
013e3554 | 2140 | &lwp->pending_signals_to_report.back ().info); |
fa593d66 PA |
2141 | } |
2142 | ||
2143 | /* Dequeue one signal from the "signals to report later when out of | |
2144 | the jump pad" list. */ | |
2145 | ||
2146 | static int | |
2147 | dequeue_one_deferred_signal (struct lwp_info *lwp, int *wstat) | |
2148 | { | |
d86d4aaf DE |
2149 | struct thread_info *thread = get_lwp_thread (lwp); |
2150 | ||
013e3554 | 2151 | if (!lwp->pending_signals_to_report.empty ()) |
fa593d66 | 2152 | { |
013e3554 | 2153 | const pending_signal &p_sig = lwp->pending_signals_to_report.front (); |
fa593d66 | 2154 | |
013e3554 TBA |
2155 | *wstat = W_STOPCODE (p_sig.signal); |
2156 | if (p_sig.info.si_signo != 0) | |
d86d4aaf | 2157 | ptrace (PTRACE_SETSIGINFO, lwpid_of (thread), (PTRACE_TYPE_ARG3) 0, |
013e3554 TBA |
2158 | &p_sig.info); |
2159 | ||
2160 | lwp->pending_signals_to_report.pop_front (); | |
fa593d66 PA |
2161 | |
2162 | if (debug_threads) | |
87ce2a04 | 2163 | debug_printf ("Reporting deferred signal %d for LWP %ld.\n", |
d86d4aaf | 2164 | WSTOPSIG (*wstat), lwpid_of (thread)); |
fa593d66 PA |
2165 | |
2166 | if (debug_threads) | |
2167 | { | |
013e3554 | 2168 | for (const auto &sig : lwp->pending_signals_to_report) |
87ce2a04 | 2169 | debug_printf (" Still queued %d\n", |
013e3554 | 2170 | sig.signal); |
fa593d66 | 2171 | |
87ce2a04 | 2172 | debug_printf (" (no more queued signals)\n"); |
fa593d66 PA |
2173 | } |
2174 | ||
2175 | return 1; | |
2176 | } | |
2177 | ||
2178 | return 0; | |
2179 | } | |
2180 | ||
ac1bbaca TBA |
2181 | bool |
2182 | linux_process_target::check_stopped_by_watchpoint (lwp_info *child) | |
582511be | 2183 | { |
ac1bbaca TBA |
2184 | struct thread_info *saved_thread = current_thread; |
2185 | current_thread = get_lwp_thread (child); | |
d50171e4 | 2186 | |
ac1bbaca TBA |
2187 | if (low_stopped_by_watchpoint ()) |
2188 | { | |
2189 | child->stop_reason = TARGET_STOPPED_BY_WATCHPOINT; | |
2190 | child->stopped_data_address = low_stopped_data_address (); | |
2191 | } | |
582511be | 2192 | |
ac1bbaca | 2193 | current_thread = saved_thread; |
582511be | 2194 | |
ac1bbaca TBA |
2195 | return child->stop_reason == TARGET_STOPPED_BY_WATCHPOINT; |
2196 | } | |
d50171e4 | 2197 | |
ac1bbaca TBA |
2198 | bool |
2199 | linux_process_target::low_stopped_by_watchpoint () | |
2200 | { | |
2201 | return false; | |
2202 | } | |
d50171e4 | 2203 | |
ac1bbaca TBA |
2204 | CORE_ADDR |
2205 | linux_process_target::low_stopped_data_address () | |
2206 | { | |
2207 | return 0; | |
c4d9ceb6 YQ |
2208 | } |
2209 | ||
de0d863e DB |
2210 | /* Return the ptrace options that we want to try to enable. */ |
2211 | ||
2212 | static int | |
2213 | linux_low_ptrace_options (int attached) | |
2214 | { | |
c12a5089 | 2215 | client_state &cs = get_client_state (); |
de0d863e DB |
2216 | int options = 0; |
2217 | ||
2218 | if (!attached) | |
2219 | options |= PTRACE_O_EXITKILL; | |
2220 | ||
c12a5089 | 2221 | if (cs.report_fork_events) |
de0d863e DB |
2222 | options |= PTRACE_O_TRACEFORK; |
2223 | ||
c12a5089 | 2224 | if (cs.report_vfork_events) |
c269dbdb DB |
2225 | options |= (PTRACE_O_TRACEVFORK | PTRACE_O_TRACEVFORKDONE); |
2226 | ||
c12a5089 | 2227 | if (cs.report_exec_events) |
94585166 DB |
2228 | options |= PTRACE_O_TRACEEXEC; |
2229 | ||
82075af2 JS |
2230 | options |= PTRACE_O_TRACESYSGOOD; |
2231 | ||
de0d863e DB |
2232 | return options; |
2233 | } | |
2234 | ||
1a48f002 | 2235 | void |
d16f3f6c | 2236 | linux_process_target::filter_event (int lwpid, int wstat) |
fa96cb38 | 2237 | { |
c12a5089 | 2238 | client_state &cs = get_client_state (); |
fa96cb38 PA |
2239 | struct lwp_info *child; |
2240 | struct thread_info *thread; | |
582511be | 2241 | int have_stop_pc = 0; |
fa96cb38 | 2242 | |
f2907e49 | 2243 | child = find_lwp_pid (ptid_t (lwpid)); |
fa96cb38 | 2244 | |
94585166 DB |
2245 | /* Check for stop events reported by a process we didn't already |
2246 | know about - anything not already in our LWP list. | |
2247 | ||
2248 | If we're expecting to receive stopped processes after | |
2249 | fork, vfork, and clone events, then we'll just add the | |
2250 | new one to our list and go back to waiting for the event | |
2251 | to be reported - the stopped process might be returned | |
2252 | from waitpid before or after the event is. | |
2253 | ||
2254 | But note the case of a non-leader thread exec'ing after the | |
2255 | leader having exited, and gone from our lists (because | |
2256 | check_zombie_leaders deleted it). The non-leader thread | |
2257 | changes its tid to the tgid. */ | |
2258 | ||
2259 | if (WIFSTOPPED (wstat) && child == NULL && WSTOPSIG (wstat) == SIGTRAP | |
2260 | && linux_ptrace_get_extended_event (wstat) == PTRACE_EVENT_EXEC) | |
2261 | { | |
2262 | ptid_t child_ptid; | |
2263 | ||
2264 | /* A multi-thread exec after we had seen the leader exiting. */ | |
2265 | if (debug_threads) | |
2266 | { | |
2267 | debug_printf ("LLW: Re-adding thread group leader LWP %d" | |
2268 | "after exec.\n", lwpid); | |
2269 | } | |
2270 | ||
fd79271b | 2271 | child_ptid = ptid_t (lwpid, lwpid, 0); |
94585166 DB |
2272 | child = add_lwp (child_ptid); |
2273 | child->stopped = 1; | |
2274 | current_thread = child->thread; | |
2275 | } | |
2276 | ||
fa96cb38 PA |
2277 | /* If we didn't find a process, one of two things presumably happened: |
2278 | - A process we started and then detached from has exited. Ignore it. | |
2279 | - A process we are controlling has forked and the new child's stop | |
2280 | was reported to us by the kernel. Save its PID. */ | |
2281 | if (child == NULL && WIFSTOPPED (wstat)) | |
2282 | { | |
2283 | add_to_pid_list (&stopped_pids, lwpid, wstat); | |
1a48f002 | 2284 | return; |
fa96cb38 PA |
2285 | } |
2286 | else if (child == NULL) | |
1a48f002 | 2287 | return; |
fa96cb38 PA |
2288 | |
2289 | thread = get_lwp_thread (child); | |
2290 | ||
2291 | child->stopped = 1; | |
2292 | ||
2293 | child->last_status = wstat; | |
2294 | ||
582511be PA |
2295 | /* Check if the thread has exited. */ |
2296 | if ((WIFEXITED (wstat) || WIFSIGNALED (wstat))) | |
2297 | { | |
2298 | if (debug_threads) | |
2299 | debug_printf ("LLFE: %d exited.\n", lwpid); | |
f50bf8e5 YQ |
2300 | |
2301 | if (finish_step_over (child)) | |
2302 | { | |
2303 | /* Unsuspend all other LWPs, and set them back running again. */ | |
2304 | unsuspend_all_lwps (child); | |
2305 | } | |
2306 | ||
65706a29 PA |
2307 | /* If there is at least one more LWP, then the exit signal was |
2308 | not the end of the debugged application and should be | |
2309 | ignored, unless GDB wants to hear about thread exits. */ | |
c12a5089 | 2310 | if (cs.report_thread_events |
65706a29 | 2311 | || last_thread_of_process_p (pid_of (thread))) |
582511be | 2312 | { |
65706a29 PA |
2313 | /* Since events are serialized to GDB core, and we can't |
2314 | report this one right now. Leave the status pending for | |
2315 | the next time we're able to report it. */ | |
2316 | mark_lwp_dead (child, wstat); | |
1a48f002 | 2317 | return; |
582511be PA |
2318 | } |
2319 | else | |
2320 | { | |
65706a29 | 2321 | delete_lwp (child); |
1a48f002 | 2322 | return; |
582511be PA |
2323 | } |
2324 | } | |
2325 | ||
2326 | gdb_assert (WIFSTOPPED (wstat)); | |
2327 | ||
fa96cb38 PA |
2328 | if (WIFSTOPPED (wstat)) |
2329 | { | |
2330 | struct process_info *proc; | |
2331 | ||
c06cbd92 | 2332 | /* Architecture-specific setup after inferior is running. */ |
fa96cb38 | 2333 | proc = find_process_pid (pid_of (thread)); |
c06cbd92 | 2334 | if (proc->tdesc == NULL) |
fa96cb38 | 2335 | { |
c06cbd92 YQ |
2336 | if (proc->attached) |
2337 | { | |
c06cbd92 YQ |
2338 | /* This needs to happen after we have attached to the |
2339 | inferior and it is stopped for the first time, but | |
2340 | before we access any inferior registers. */ | |
797bcff5 | 2341 | arch_setup_thread (thread); |
c06cbd92 YQ |
2342 | } |
2343 | else | |
2344 | { | |
2345 | /* The process is started, but GDBserver will do | |
2346 | architecture-specific setup after the program stops at | |
2347 | the first instruction. */ | |
2348 | child->status_pending_p = 1; | |
2349 | child->status_pending = wstat; | |
1a48f002 | 2350 | return; |
c06cbd92 | 2351 | } |
fa96cb38 PA |
2352 | } |
2353 | } | |
2354 | ||
fa96cb38 PA |
2355 | if (WIFSTOPPED (wstat) && child->must_set_ptrace_flags) |
2356 | { | |
beed38b8 | 2357 | struct process_info *proc = find_process_pid (pid_of (thread)); |
de0d863e | 2358 | int options = linux_low_ptrace_options (proc->attached); |
beed38b8 | 2359 | |
de0d863e | 2360 | linux_enable_event_reporting (lwpid, options); |
fa96cb38 PA |
2361 | child->must_set_ptrace_flags = 0; |
2362 | } | |
2363 | ||
82075af2 JS |
2364 | /* Always update syscall_state, even if it will be filtered later. */ |
2365 | if (WIFSTOPPED (wstat) && WSTOPSIG (wstat) == SYSCALL_SIGTRAP) | |
2366 | { | |
2367 | child->syscall_state | |
2368 | = (child->syscall_state == TARGET_WAITKIND_SYSCALL_ENTRY | |
2369 | ? TARGET_WAITKIND_SYSCALL_RETURN | |
2370 | : TARGET_WAITKIND_SYSCALL_ENTRY); | |
2371 | } | |
2372 | else | |
2373 | { | |
2374 | /* Almost all other ptrace-stops are known to be outside of system | |
2375 | calls, with further exceptions in handle_extended_wait. */ | |
2376 | child->syscall_state = TARGET_WAITKIND_IGNORE; | |
2377 | } | |
2378 | ||
e7ad2f14 PA |
2379 | /* Be careful to not overwrite stop_pc until save_stop_reason is |
2380 | called. */ | |
fa96cb38 | 2381 | if (WIFSTOPPED (wstat) && WSTOPSIG (wstat) == SIGTRAP |
89a5711c | 2382 | && linux_is_extended_waitstatus (wstat)) |
fa96cb38 | 2383 | { |
582511be | 2384 | child->stop_pc = get_pc (child); |
94585166 | 2385 | if (handle_extended_wait (&child, wstat)) |
de0d863e DB |
2386 | { |
2387 | /* The event has been handled, so just return without | |
2388 | reporting it. */ | |
1a48f002 | 2389 | return; |
de0d863e | 2390 | } |
fa96cb38 PA |
2391 | } |
2392 | ||
80aea927 | 2393 | if (linux_wstatus_maybe_breakpoint (wstat)) |
582511be | 2394 | { |
e7ad2f14 | 2395 | if (save_stop_reason (child)) |
582511be PA |
2396 | have_stop_pc = 1; |
2397 | } | |
2398 | ||
2399 | if (!have_stop_pc) | |
2400 | child->stop_pc = get_pc (child); | |
2401 | ||
fa96cb38 PA |
2402 | if (WIFSTOPPED (wstat) && WSTOPSIG (wstat) == SIGSTOP |
2403 | && child->stop_expected) | |
2404 | { | |
2405 | if (debug_threads) | |
2406 | debug_printf ("Expected stop.\n"); | |
2407 | child->stop_expected = 0; | |
2408 | ||
2409 | if (thread->last_resume_kind == resume_stop) | |
2410 | { | |
2411 | /* We want to report the stop to the core. Treat the | |
2412 | SIGSTOP as a normal event. */ | |
2bf6fb9d PA |
2413 | if (debug_threads) |
2414 | debug_printf ("LLW: resume_stop SIGSTOP caught for %s.\n", | |
2415 | target_pid_to_str (ptid_of (thread))); | |
fa96cb38 PA |
2416 | } |
2417 | else if (stopping_threads != NOT_STOPPING_THREADS) | |
2418 | { | |
2419 | /* Stopping threads. We don't want this SIGSTOP to end up | |
582511be | 2420 | pending. */ |
2bf6fb9d PA |
2421 | if (debug_threads) |
2422 | debug_printf ("LLW: SIGSTOP caught for %s " | |
2423 | "while stopping threads.\n", | |
2424 | target_pid_to_str (ptid_of (thread))); | |
1a48f002 | 2425 | return; |
fa96cb38 PA |
2426 | } |
2427 | else | |
2428 | { | |
2bf6fb9d PA |
2429 | /* This is a delayed SIGSTOP. Filter out the event. */ |
2430 | if (debug_threads) | |
2431 | debug_printf ("LLW: %s %s, 0, 0 (discard delayed SIGSTOP)\n", | |
2432 | child->stepping ? "step" : "continue", | |
2433 | target_pid_to_str (ptid_of (thread))); | |
2434 | ||
df95181f | 2435 | resume_one_lwp (child, child->stepping, 0, NULL); |
1a48f002 | 2436 | return; |
fa96cb38 PA |
2437 | } |
2438 | } | |
2439 | ||
582511be PA |
2440 | child->status_pending_p = 1; |
2441 | child->status_pending = wstat; | |
1a48f002 | 2442 | return; |
fa96cb38 PA |
2443 | } |
2444 | ||
b31cdfa6 TBA |
2445 | bool |
2446 | linux_process_target::maybe_hw_step (thread_info *thread) | |
f79b145d | 2447 | { |
b31cdfa6 TBA |
2448 | if (supports_hardware_single_step ()) |
2449 | return true; | |
f79b145d YQ |
2450 | else |
2451 | { | |
3b9a79ef | 2452 | /* GDBserver must insert single-step breakpoint for software |
f79b145d | 2453 | single step. */ |
3b9a79ef | 2454 | gdb_assert (has_single_step_breakpoints (thread)); |
b31cdfa6 | 2455 | return false; |
f79b145d YQ |
2456 | } |
2457 | } | |
2458 | ||
df95181f TBA |
2459 | void |
2460 | linux_process_target::resume_stopped_resumed_lwps (thread_info *thread) | |
20ba1ce6 | 2461 | { |
20ba1ce6 PA |
2462 | struct lwp_info *lp = get_thread_lwp (thread); |
2463 | ||
2464 | if (lp->stopped | |
863d01bd | 2465 | && !lp->suspended |
20ba1ce6 | 2466 | && !lp->status_pending_p |
20ba1ce6 PA |
2467 | && thread->last_status.kind == TARGET_WAITKIND_IGNORE) |
2468 | { | |
8901d193 YQ |
2469 | int step = 0; |
2470 | ||
2471 | if (thread->last_resume_kind == resume_step) | |
2472 | step = maybe_hw_step (thread); | |
20ba1ce6 PA |
2473 | |
2474 | if (debug_threads) | |
2475 | debug_printf ("RSRL: resuming stopped-resumed LWP %s at %s: step=%d\n", | |
2476 | target_pid_to_str (ptid_of (thread)), | |
2477 | paddress (lp->stop_pc), | |
2478 | step); | |
2479 | ||
df95181f | 2480 | resume_one_lwp (lp, step, GDB_SIGNAL_0, NULL); |
20ba1ce6 PA |
2481 | } |
2482 | } | |
2483 | ||
d16f3f6c TBA |
2484 | int |
2485 | linux_process_target::wait_for_event_filtered (ptid_t wait_ptid, | |
2486 | ptid_t filter_ptid, | |
2487 | int *wstatp, int options) | |
0d62e5e8 | 2488 | { |
d86d4aaf | 2489 | struct thread_info *event_thread; |
d50171e4 | 2490 | struct lwp_info *event_child, *requested_child; |
fa96cb38 | 2491 | sigset_t block_mask, prev_mask; |
d50171e4 | 2492 | |
fa96cb38 | 2493 | retry: |
d86d4aaf DE |
2494 | /* N.B. event_thread points to the thread_info struct that contains |
2495 | event_child. Keep them in sync. */ | |
2496 | event_thread = NULL; | |
d50171e4 PA |
2497 | event_child = NULL; |
2498 | requested_child = NULL; | |
0d62e5e8 | 2499 | |
95954743 | 2500 | /* Check for a lwp with a pending status. */ |
bd99dc85 | 2501 | |
d7e15655 | 2502 | if (filter_ptid == minus_one_ptid || filter_ptid.is_pid ()) |
0d62e5e8 | 2503 | { |
83e1b6c1 SM |
2504 | event_thread = find_thread_in_random ([&] (thread_info *thread) |
2505 | { | |
2506 | return status_pending_p_callback (thread, filter_ptid); | |
2507 | }); | |
2508 | ||
d86d4aaf DE |
2509 | if (event_thread != NULL) |
2510 | event_child = get_thread_lwp (event_thread); | |
2511 | if (debug_threads && event_thread) | |
2512 | debug_printf ("Got a pending child %ld\n", lwpid_of (event_thread)); | |
0d62e5e8 | 2513 | } |
d7e15655 | 2514 | else if (filter_ptid != null_ptid) |
0d62e5e8 | 2515 | { |
fa96cb38 | 2516 | requested_child = find_lwp_pid (filter_ptid); |
d50171e4 | 2517 | |
bde24c0a | 2518 | if (stopping_threads == NOT_STOPPING_THREADS |
fa593d66 | 2519 | && requested_child->status_pending_p |
229d26fc SM |
2520 | && (requested_child->collecting_fast_tracepoint |
2521 | != fast_tpoint_collect_result::not_collecting)) | |
fa593d66 PA |
2522 | { |
2523 | enqueue_one_deferred_signal (requested_child, | |
2524 | &requested_child->status_pending); | |
2525 | requested_child->status_pending_p = 0; | |
2526 | requested_child->status_pending = 0; | |
df95181f | 2527 | resume_one_lwp (requested_child, 0, 0, NULL); |
fa593d66 PA |
2528 | } |
2529 | ||
2530 | if (requested_child->suspended | |
2531 | && requested_child->status_pending_p) | |
38e08fca GB |
2532 | { |
2533 | internal_error (__FILE__, __LINE__, | |
2534 | "requesting an event out of a" | |
2535 | " suspended child?"); | |
2536 | } | |
fa593d66 | 2537 | |
d50171e4 | 2538 | if (requested_child->status_pending_p) |
d86d4aaf DE |
2539 | { |
2540 | event_child = requested_child; | |
2541 | event_thread = get_lwp_thread (event_child); | |
2542 | } | |
0d62e5e8 | 2543 | } |
611cb4a5 | 2544 | |
0d62e5e8 DJ |
2545 | if (event_child != NULL) |
2546 | { | |
bd99dc85 | 2547 | if (debug_threads) |
87ce2a04 | 2548 | debug_printf ("Got an event from pending child %ld (%04x)\n", |
d86d4aaf | 2549 | lwpid_of (event_thread), event_child->status_pending); |
fa96cb38 | 2550 | *wstatp = event_child->status_pending; |
bd99dc85 PA |
2551 | event_child->status_pending_p = 0; |
2552 | event_child->status_pending = 0; | |
0bfdf32f | 2553 | current_thread = event_thread; |
d86d4aaf | 2554 | return lwpid_of (event_thread); |
0d62e5e8 DJ |
2555 | } |
2556 | ||
fa96cb38 PA |
2557 | /* But if we don't find a pending event, we'll have to wait. |
2558 | ||
2559 | We only enter this loop if no process has a pending wait status. | |
2560 | Thus any action taken in response to a wait status inside this | |
2561 | loop is responding as soon as we detect the status, not after any | |
2562 | pending events. */ | |
d8301ad1 | 2563 | |
fa96cb38 PA |
2564 | /* Make sure SIGCHLD is blocked until the sigsuspend below. Block |
2565 | all signals while here. */ | |
2566 | sigfillset (&block_mask); | |
21987b9c | 2567 | gdb_sigmask (SIG_BLOCK, &block_mask, &prev_mask); |
fa96cb38 | 2568 | |
582511be PA |
2569 | /* Always pull all events out of the kernel. We'll randomly select |
2570 | an event LWP out of all that have events, to prevent | |
2571 | starvation. */ | |
fa96cb38 | 2572 | while (event_child == NULL) |
0d62e5e8 | 2573 | { |
fa96cb38 | 2574 | pid_t ret = 0; |
0d62e5e8 | 2575 | |
fa96cb38 PA |
2576 | /* Always use -1 and WNOHANG, due to couple of a kernel/ptrace |
2577 | quirks: | |
0d62e5e8 | 2578 | |
fa96cb38 PA |
2579 | - If the thread group leader exits while other threads in the |
2580 | thread group still exist, waitpid(TGID, ...) hangs. That | |
2581 | waitpid won't return an exit status until the other threads | |
2582 | in the group are reaped. | |
611cb4a5 | 2583 | |
fa96cb38 PA |
2584 | - When a non-leader thread execs, that thread just vanishes |
2585 | without reporting an exit (so we'd hang if we waited for it | |
2586 | explicitly in that case). The exec event is reported to | |
94585166 | 2587 | the TGID pid. */ |
fa96cb38 PA |
2588 | errno = 0; |
2589 | ret = my_waitpid (-1, wstatp, options | WNOHANG); | |
d8301ad1 | 2590 | |
fa96cb38 PA |
2591 | if (debug_threads) |
2592 | debug_printf ("LWFE: waitpid(-1, ...) returned %d, %s\n", | |
6d91ce9a | 2593 | ret, errno ? safe_strerror (errno) : "ERRNO-OK"); |
0d62e5e8 | 2594 | |
fa96cb38 | 2595 | if (ret > 0) |
0d62e5e8 | 2596 | { |
89be2091 | 2597 | if (debug_threads) |
bd99dc85 | 2598 | { |
fa96cb38 | 2599 | debug_printf ("LLW: waitpid %ld received %s\n", |
8d06918f | 2600 | (long) ret, status_to_str (*wstatp).c_str ()); |
bd99dc85 | 2601 | } |
89be2091 | 2602 | |
582511be PA |
2603 | /* Filter all events. IOW, leave all events pending. We'll |
2604 | randomly select an event LWP out of all that have events | |
2605 | below. */ | |
d16f3f6c | 2606 | filter_event (ret, *wstatp); |
fa96cb38 PA |
2607 | /* Retry until nothing comes out of waitpid. A single |
2608 | SIGCHLD can indicate more than one child stopped. */ | |
89be2091 DJ |
2609 | continue; |
2610 | } | |
2611 | ||
20ba1ce6 PA |
2612 | /* Now that we've pulled all events out of the kernel, resume |
2613 | LWPs that don't have an interesting event to report. */ | |
2614 | if (stopping_threads == NOT_STOPPING_THREADS) | |
df95181f TBA |
2615 | for_each_thread ([this] (thread_info *thread) |
2616 | { | |
2617 | resume_stopped_resumed_lwps (thread); | |
2618 | }); | |
20ba1ce6 PA |
2619 | |
2620 | /* ... and find an LWP with a status to report to the core, if | |
2621 | any. */ | |
83e1b6c1 SM |
2622 | event_thread = find_thread_in_random ([&] (thread_info *thread) |
2623 | { | |
2624 | return status_pending_p_callback (thread, filter_ptid); | |
2625 | }); | |
2626 | ||
582511be PA |
2627 | if (event_thread != NULL) |
2628 | { | |
2629 | event_child = get_thread_lwp (event_thread); | |
2630 | *wstatp = event_child->status_pending; | |
2631 | event_child->status_pending_p = 0; | |
2632 | event_child->status_pending = 0; | |
2633 | break; | |
2634 | } | |
2635 | ||
fa96cb38 PA |
2636 | /* Check for zombie thread group leaders. Those can't be reaped |
2637 | until all other threads in the thread group are. */ | |
2638 | check_zombie_leaders (); | |
2639 | ||
a1385b7b SM |
2640 | auto not_stopped = [&] (thread_info *thread) |
2641 | { | |
2642 | return not_stopped_callback (thread, wait_ptid); | |
2643 | }; | |
2644 | ||
fa96cb38 PA |
2645 | /* If there are no resumed children left in the set of LWPs we |
2646 | want to wait for, bail. We can't just block in | |
2647 | waitpid/sigsuspend, because lwps might have been left stopped | |
2648 | in trace-stop state, and we'd be stuck forever waiting for | |
2649 | their status to change (which would only happen if we resumed | |
2650 | them). Even if WNOHANG is set, this return code is preferred | |
2651 | over 0 (below), as it is more detailed. */ | |
a1385b7b | 2652 | if (find_thread (not_stopped) == NULL) |
a6dbe5df | 2653 | { |
fa96cb38 PA |
2654 | if (debug_threads) |
2655 | debug_printf ("LLW: exit (no unwaited-for LWP)\n"); | |
21987b9c | 2656 | gdb_sigmask (SIG_SETMASK, &prev_mask, NULL); |
fa96cb38 | 2657 | return -1; |
a6dbe5df PA |
2658 | } |
2659 | ||
fa96cb38 PA |
2660 | /* No interesting event to report to the caller. */ |
2661 | if ((options & WNOHANG)) | |
24a09b5f | 2662 | { |
fa96cb38 PA |
2663 | if (debug_threads) |
2664 | debug_printf ("WNOHANG set, no event found\n"); | |
2665 | ||
21987b9c | 2666 | gdb_sigmask (SIG_SETMASK, &prev_mask, NULL); |
fa96cb38 | 2667 | return 0; |
24a09b5f DJ |
2668 | } |
2669 | ||
fa96cb38 PA |
2670 | /* Block until we get an event reported with SIGCHLD. */ |
2671 | if (debug_threads) | |
2672 | debug_printf ("sigsuspend'ing\n"); | |
d50171e4 | 2673 | |
fa96cb38 | 2674 | sigsuspend (&prev_mask); |
21987b9c | 2675 | gdb_sigmask (SIG_SETMASK, &prev_mask, NULL); |
fa96cb38 PA |
2676 | goto retry; |
2677 | } | |
d50171e4 | 2678 | |
21987b9c | 2679 | gdb_sigmask (SIG_SETMASK, &prev_mask, NULL); |
d50171e4 | 2680 | |
0bfdf32f | 2681 | current_thread = event_thread; |
d50171e4 | 2682 | |
fa96cb38 PA |
2683 | return lwpid_of (event_thread); |
2684 | } | |
2685 | ||
d16f3f6c TBA |
2686 | int |
2687 | linux_process_target::wait_for_event (ptid_t ptid, int *wstatp, int options) | |
fa96cb38 | 2688 | { |
d16f3f6c | 2689 | return wait_for_event_filtered (ptid, ptid, wstatp, options); |
611cb4a5 DJ |
2690 | } |
2691 | ||
6bf5e0ba PA |
2692 | /* Select one LWP out of those that have events pending. */ |
2693 | ||
2694 | static void | |
2695 | select_event_lwp (struct lwp_info **orig_lp) | |
2696 | { | |
582511be PA |
2697 | struct thread_info *event_thread = NULL; |
2698 | ||
2699 | /* In all-stop, give preference to the LWP that is being | |
2700 | single-stepped. There will be at most one, and it's the LWP that | |
2701 | the core is most interested in. If we didn't do this, then we'd | |
2702 | have to handle pending step SIGTRAPs somehow in case the core | |
2703 | later continues the previously-stepped thread, otherwise we'd | |
2704 | report the pending SIGTRAP, and the core, not having stepped the | |
2705 | thread, wouldn't understand what the trap was for, and therefore | |
2706 | would report it to the user as a random signal. */ | |
2707 | if (!non_stop) | |
6bf5e0ba | 2708 | { |
39a64da5 SM |
2709 | event_thread = find_thread ([] (thread_info *thread) |
2710 | { | |
2711 | lwp_info *lp = get_thread_lwp (thread); | |
2712 | ||
2713 | return (thread->last_status.kind == TARGET_WAITKIND_IGNORE | |
2714 | && thread->last_resume_kind == resume_step | |
2715 | && lp->status_pending_p); | |
2716 | }); | |
2717 | ||
582511be PA |
2718 | if (event_thread != NULL) |
2719 | { | |
2720 | if (debug_threads) | |
2721 | debug_printf ("SEL: Select single-step %s\n", | |
2722 | target_pid_to_str (ptid_of (event_thread))); | |
2723 | } | |
6bf5e0ba | 2724 | } |
582511be | 2725 | if (event_thread == NULL) |
6bf5e0ba PA |
2726 | { |
2727 | /* No single-stepping LWP. Select one at random, out of those | |
dda83cd7 | 2728 | which have had events. */ |
6bf5e0ba | 2729 | |
b0319eaa | 2730 | event_thread = find_thread_in_random ([&] (thread_info *thread) |
39a64da5 SM |
2731 | { |
2732 | lwp_info *lp = get_thread_lwp (thread); | |
2733 | ||
b0319eaa TT |
2734 | /* Only resumed LWPs that have an event pending. */ |
2735 | return (thread->last_status.kind == TARGET_WAITKIND_IGNORE | |
2736 | && lp->status_pending_p); | |
39a64da5 | 2737 | }); |
6bf5e0ba PA |
2738 | } |
2739 | ||
d86d4aaf | 2740 | if (event_thread != NULL) |
6bf5e0ba | 2741 | { |
d86d4aaf DE |
2742 | struct lwp_info *event_lp = get_thread_lwp (event_thread); |
2743 | ||
6bf5e0ba PA |
2744 | /* Switch the event LWP. */ |
2745 | *orig_lp = event_lp; | |
2746 | } | |
2747 | } | |
2748 | ||
7984d532 PA |
2749 | /* Decrement the suspend count of all LWPs, except EXCEPT, if non |
2750 | NULL. */ | |
2751 | ||
2752 | static void | |
2753 | unsuspend_all_lwps (struct lwp_info *except) | |
2754 | { | |
139720c5 SM |
2755 | for_each_thread ([&] (thread_info *thread) |
2756 | { | |
2757 | lwp_info *lwp = get_thread_lwp (thread); | |
2758 | ||
2759 | if (lwp != except) | |
2760 | lwp_suspended_decr (lwp); | |
2761 | }); | |
7984d532 PA |
2762 | } |
2763 | ||
5a6b0a41 | 2764 | static bool lwp_running (thread_info *thread); |
fa593d66 PA |
2765 | |
2766 | /* Stabilize threads (move out of jump pads). | |
2767 | ||
2768 | If a thread is midway collecting a fast tracepoint, we need to | |
2769 | finish the collection and move it out of the jump pad before | |
2770 | reporting the signal. | |
2771 | ||
2772 | This avoids recursion while collecting (when a signal arrives | |
2773 | midway, and the signal handler itself collects), which would trash | |
2774 | the trace buffer. In case the user set a breakpoint in a signal | |
2775 | handler, this avoids the backtrace showing the jump pad, etc.. | |
2776 | Most importantly, there are certain things we can't do safely if | |
2777 | threads are stopped in a jump pad (or in its callee's). For | |
2778 | example: | |
2779 | ||
2780 | - starting a new trace run. A thread still collecting the | |
2781 | previous run, could trash the trace buffer when resumed. The trace | |
2782 | buffer control structures would have been reset but the thread had | |
2783 | no way to tell. The thread could even midway memcpy'ing to the | |
2784 | buffer, which would mean that when resumed, it would clobber the | |
2785 | trace buffer that had been set for a new run. | |
2786 | ||
2787 | - we can't rewrite/reuse the jump pads for new tracepoints | |
2788 | safely. Say you do tstart while a thread is stopped midway while | |
2789 | collecting. When the thread is later resumed, it finishes the | |
2790 | collection, and returns to the jump pad, to execute the original | |
2791 | instruction that was under the tracepoint jump at the time the | |
2792 | older run had been started. If the jump pad had been rewritten | |
2793 | since for something else in the new run, the thread would now | |
2794 | execute the wrong / random instructions. */ | |
2795 | ||
5c9eb2f2 TBA |
2796 | void |
2797 | linux_process_target::stabilize_threads () | |
fa593d66 | 2798 | { |
13e567af TBA |
2799 | thread_info *thread_stuck = find_thread ([this] (thread_info *thread) |
2800 | { | |
2801 | return stuck_in_jump_pad (thread); | |
2802 | }); | |
fa593d66 | 2803 | |
d86d4aaf | 2804 | if (thread_stuck != NULL) |
fa593d66 | 2805 | { |
b4d51a55 | 2806 | if (debug_threads) |
87ce2a04 | 2807 | debug_printf ("can't stabilize, LWP %ld is stuck in jump pad\n", |
d86d4aaf | 2808 | lwpid_of (thread_stuck)); |
fa593d66 PA |
2809 | return; |
2810 | } | |
2811 | ||
fcb056a5 | 2812 | thread_info *saved_thread = current_thread; |
fa593d66 PA |
2813 | |
2814 | stabilizing_threads = 1; | |
2815 | ||
2816 | /* Kick 'em all. */ | |
d16f3f6c TBA |
2817 | for_each_thread ([this] (thread_info *thread) |
2818 | { | |
2819 | move_out_of_jump_pad (thread); | |
2820 | }); | |
fa593d66 PA |
2821 | |
2822 | /* Loop until all are stopped out of the jump pads. */ | |
5a6b0a41 | 2823 | while (find_thread (lwp_running) != NULL) |
fa593d66 PA |
2824 | { |
2825 | struct target_waitstatus ourstatus; | |
2826 | struct lwp_info *lwp; | |
fa593d66 PA |
2827 | int wstat; |
2828 | ||
2829 | /* Note that we go through the full wait even loop. While | |
2830 | moving threads out of jump pad, we need to be able to step | |
2831 | over internal breakpoints and such. */ | |
d16f3f6c | 2832 | wait_1 (minus_one_ptid, &ourstatus, 0); |
fa593d66 PA |
2833 | |
2834 | if (ourstatus.kind == TARGET_WAITKIND_STOPPED) | |
2835 | { | |
0bfdf32f | 2836 | lwp = get_thread_lwp (current_thread); |
fa593d66 PA |
2837 | |
2838 | /* Lock it. */ | |
863d01bd | 2839 | lwp_suspended_inc (lwp); |
fa593d66 | 2840 | |
a493e3e2 | 2841 | if (ourstatus.value.sig != GDB_SIGNAL_0 |
0bfdf32f | 2842 | || current_thread->last_resume_kind == resume_stop) |
fa593d66 | 2843 | { |
2ea28649 | 2844 | wstat = W_STOPCODE (gdb_signal_to_host (ourstatus.value.sig)); |
fa593d66 PA |
2845 | enqueue_one_deferred_signal (lwp, &wstat); |
2846 | } | |
2847 | } | |
2848 | } | |
2849 | ||
fcdad592 | 2850 | unsuspend_all_lwps (NULL); |
fa593d66 PA |
2851 | |
2852 | stabilizing_threads = 0; | |
2853 | ||
0bfdf32f | 2854 | current_thread = saved_thread; |
fa593d66 | 2855 | |
b4d51a55 | 2856 | if (debug_threads) |
fa593d66 | 2857 | { |
13e567af TBA |
2858 | thread_stuck = find_thread ([this] (thread_info *thread) |
2859 | { | |
2860 | return stuck_in_jump_pad (thread); | |
2861 | }); | |
fcb056a5 | 2862 | |
d86d4aaf | 2863 | if (thread_stuck != NULL) |
87ce2a04 | 2864 | debug_printf ("couldn't stabilize, LWP %ld got stuck in jump pad\n", |
d86d4aaf | 2865 | lwpid_of (thread_stuck)); |
fa593d66 PA |
2866 | } |
2867 | } | |
2868 | ||
582511be PA |
2869 | /* Convenience function that is called when the kernel reports an |
2870 | event that is not passed out to GDB. */ | |
2871 | ||
2872 | static ptid_t | |
2873 | ignore_event (struct target_waitstatus *ourstatus) | |
2874 | { | |
2875 | /* If we got an event, there may still be others, as a single | |
2876 | SIGCHLD can indicate more than one child stopped. This forces | |
2877 | another target_wait call. */ | |
2878 | async_file_mark (); | |
2879 | ||
2880 | ourstatus->kind = TARGET_WAITKIND_IGNORE; | |
2881 | return null_ptid; | |
2882 | } | |
2883 | ||
fd000fb3 TBA |
2884 | ptid_t |
2885 | linux_process_target::filter_exit_event (lwp_info *event_child, | |
2886 | target_waitstatus *ourstatus) | |
65706a29 | 2887 | { |
c12a5089 | 2888 | client_state &cs = get_client_state (); |
65706a29 PA |
2889 | struct thread_info *thread = get_lwp_thread (event_child); |
2890 | ptid_t ptid = ptid_of (thread); | |
2891 | ||
2892 | if (!last_thread_of_process_p (pid_of (thread))) | |
2893 | { | |
c12a5089 | 2894 | if (cs.report_thread_events) |
65706a29 PA |
2895 | ourstatus->kind = TARGET_WAITKIND_THREAD_EXITED; |
2896 | else | |
2897 | ourstatus->kind = TARGET_WAITKIND_IGNORE; | |
2898 | ||
2899 | delete_lwp (event_child); | |
2900 | } | |
2901 | return ptid; | |
2902 | } | |
2903 | ||
82075af2 JS |
2904 | /* Returns 1 if GDB is interested in any event_child syscalls. */ |
2905 | ||
2906 | static int | |
2907 | gdb_catching_syscalls_p (struct lwp_info *event_child) | |
2908 | { | |
2909 | struct thread_info *thread = get_lwp_thread (event_child); | |
2910 | struct process_info *proc = get_thread_process (thread); | |
2911 | ||
f27866ba | 2912 | return !proc->syscalls_to_catch.empty (); |
82075af2 JS |
2913 | } |
2914 | ||
9eedd27d TBA |
2915 | bool |
2916 | linux_process_target::gdb_catch_this_syscall (lwp_info *event_child) | |
82075af2 | 2917 | { |
4cc32bec | 2918 | int sysno; |
82075af2 JS |
2919 | struct thread_info *thread = get_lwp_thread (event_child); |
2920 | struct process_info *proc = get_thread_process (thread); | |
2921 | ||
f27866ba | 2922 | if (proc->syscalls_to_catch.empty ()) |
9eedd27d | 2923 | return false; |
82075af2 | 2924 | |
f27866ba | 2925 | if (proc->syscalls_to_catch[0] == ANY_SYSCALL) |
9eedd27d | 2926 | return true; |
82075af2 | 2927 | |
4cc32bec | 2928 | get_syscall_trapinfo (event_child, &sysno); |
f27866ba SM |
2929 | |
2930 | for (int iter : proc->syscalls_to_catch) | |
82075af2 | 2931 | if (iter == sysno) |
9eedd27d | 2932 | return true; |
82075af2 | 2933 | |
9eedd27d | 2934 | return false; |
82075af2 JS |
2935 | } |
2936 | ||
d16f3f6c TBA |
2937 | ptid_t |
2938 | linux_process_target::wait_1 (ptid_t ptid, target_waitstatus *ourstatus, | |
b60cea74 | 2939 | target_wait_flags target_options) |
da6d8c04 | 2940 | { |
c12a5089 | 2941 | client_state &cs = get_client_state (); |
e5f1222d | 2942 | int w; |
fc7238bb | 2943 | struct lwp_info *event_child; |
bd99dc85 | 2944 | int options; |
bd99dc85 | 2945 | int pid; |
6bf5e0ba PA |
2946 | int step_over_finished; |
2947 | int bp_explains_trap; | |
2948 | int maybe_internal_trap; | |
2949 | int report_to_gdb; | |
219f2f23 | 2950 | int trace_event; |
c2d6af84 | 2951 | int in_step_range; |
f2faf941 | 2952 | int any_resumed; |
bd99dc85 | 2953 | |
87ce2a04 DE |
2954 | if (debug_threads) |
2955 | { | |
2956 | debug_enter (); | |
d16f3f6c | 2957 | debug_printf ("wait_1: [%s]\n", target_pid_to_str (ptid)); |
87ce2a04 DE |
2958 | } |
2959 | ||
bd99dc85 PA |
2960 | /* Translate generic target options into linux options. */ |
2961 | options = __WALL; | |
2962 | if (target_options & TARGET_WNOHANG) | |
2963 | options |= WNOHANG; | |
0d62e5e8 | 2964 | |
fa593d66 PA |
2965 | bp_explains_trap = 0; |
2966 | trace_event = 0; | |
c2d6af84 | 2967 | in_step_range = 0; |
bd99dc85 PA |
2968 | ourstatus->kind = TARGET_WAITKIND_IGNORE; |
2969 | ||
83e1b6c1 SM |
2970 | auto status_pending_p_any = [&] (thread_info *thread) |
2971 | { | |
2972 | return status_pending_p_callback (thread, minus_one_ptid); | |
2973 | }; | |
2974 | ||
a1385b7b SM |
2975 | auto not_stopped = [&] (thread_info *thread) |
2976 | { | |
2977 | return not_stopped_callback (thread, minus_one_ptid); | |
2978 | }; | |
2979 | ||
f2faf941 | 2980 | /* Find a resumed LWP, if any. */ |
83e1b6c1 | 2981 | if (find_thread (status_pending_p_any) != NULL) |
f2faf941 | 2982 | any_resumed = 1; |
a1385b7b | 2983 | else if (find_thread (not_stopped) != NULL) |
f2faf941 PA |
2984 | any_resumed = 1; |
2985 | else | |
2986 | any_resumed = 0; | |
2987 | ||
d7e15655 | 2988 | if (step_over_bkpt == null_ptid) |
d16f3f6c | 2989 | pid = wait_for_event (ptid, &w, options); |
6bf5e0ba PA |
2990 | else |
2991 | { | |
2992 | if (debug_threads) | |
87ce2a04 DE |
2993 | debug_printf ("step_over_bkpt set [%s], doing a blocking wait\n", |
2994 | target_pid_to_str (step_over_bkpt)); | |
d16f3f6c | 2995 | pid = wait_for_event (step_over_bkpt, &w, options & ~WNOHANG); |
6bf5e0ba PA |
2996 | } |
2997 | ||
f2faf941 | 2998 | if (pid == 0 || (pid == -1 && !any_resumed)) |
87ce2a04 | 2999 | { |
fa96cb38 PA |
3000 | gdb_assert (target_options & TARGET_WNOHANG); |
3001 | ||
87ce2a04 DE |
3002 | if (debug_threads) |
3003 | { | |
d16f3f6c | 3004 | debug_printf ("wait_1 ret = null_ptid, " |
fa96cb38 | 3005 | "TARGET_WAITKIND_IGNORE\n"); |
87ce2a04 DE |
3006 | debug_exit (); |
3007 | } | |
fa96cb38 PA |
3008 | |
3009 | ourstatus->kind = TARGET_WAITKIND_IGNORE; | |
87ce2a04 DE |
3010 | return null_ptid; |
3011 | } | |
fa96cb38 PA |
3012 | else if (pid == -1) |
3013 | { | |
3014 | if (debug_threads) | |
3015 | { | |
d16f3f6c | 3016 | debug_printf ("wait_1 ret = null_ptid, " |
fa96cb38 PA |
3017 | "TARGET_WAITKIND_NO_RESUMED\n"); |
3018 | debug_exit (); | |
3019 | } | |
bd99dc85 | 3020 | |
fa96cb38 PA |
3021 | ourstatus->kind = TARGET_WAITKIND_NO_RESUMED; |
3022 | return null_ptid; | |
3023 | } | |
0d62e5e8 | 3024 | |
0bfdf32f | 3025 | event_child = get_thread_lwp (current_thread); |
0d62e5e8 | 3026 | |
d16f3f6c | 3027 | /* wait_for_event only returns an exit status for the last |
fa96cb38 PA |
3028 | child of a process. Report it. */ |
3029 | if (WIFEXITED (w) || WIFSIGNALED (w)) | |
da6d8c04 | 3030 | { |
fa96cb38 | 3031 | if (WIFEXITED (w)) |
0d62e5e8 | 3032 | { |
fa96cb38 PA |
3033 | ourstatus->kind = TARGET_WAITKIND_EXITED; |
3034 | ourstatus->value.integer = WEXITSTATUS (w); | |
bd99dc85 | 3035 | |
fa96cb38 | 3036 | if (debug_threads) |
bd99dc85 | 3037 | { |
d16f3f6c | 3038 | debug_printf ("wait_1 ret = %s, exited with " |
fa96cb38 | 3039 | "retcode %d\n", |
0bfdf32f | 3040 | target_pid_to_str (ptid_of (current_thread)), |
fa96cb38 PA |
3041 | WEXITSTATUS (w)); |
3042 | debug_exit (); | |
bd99dc85 | 3043 | } |
fa96cb38 PA |
3044 | } |
3045 | else | |
3046 | { | |
3047 | ourstatus->kind = TARGET_WAITKIND_SIGNALLED; | |
3048 | ourstatus->value.sig = gdb_signal_from_host (WTERMSIG (w)); | |
5b1c542e | 3049 | |
fa96cb38 PA |
3050 | if (debug_threads) |
3051 | { | |
d16f3f6c | 3052 | debug_printf ("wait_1 ret = %s, terminated with " |
fa96cb38 | 3053 | "signal %d\n", |
0bfdf32f | 3054 | target_pid_to_str (ptid_of (current_thread)), |
fa96cb38 PA |
3055 | WTERMSIG (w)); |
3056 | debug_exit (); | |
3057 | } | |
0d62e5e8 | 3058 | } |
fa96cb38 | 3059 | |
65706a29 PA |
3060 | if (ourstatus->kind == TARGET_WAITKIND_EXITED) |
3061 | return filter_exit_event (event_child, ourstatus); | |
3062 | ||
0bfdf32f | 3063 | return ptid_of (current_thread); |
da6d8c04 DJ |
3064 | } |
3065 | ||
2d97cd35 AT |
3066 | /* If step-over executes a breakpoint instruction, in the case of a |
3067 | hardware single step it means a gdb/gdbserver breakpoint had been | |
3068 | planted on top of a permanent breakpoint, in the case of a software | |
3069 | single step it may just mean that gdbserver hit the reinsert breakpoint. | |
e7ad2f14 | 3070 | The PC has been adjusted by save_stop_reason to point at |
2d97cd35 AT |
3071 | the breakpoint address. |
3072 | So in the case of the hardware single step advance the PC manually | |
3073 | past the breakpoint and in the case of software single step advance only | |
3b9a79ef | 3074 | if it's not the single_step_breakpoint we are hitting. |
2d97cd35 AT |
3075 | This avoids that a program would keep trapping a permanent breakpoint |
3076 | forever. */ | |
d7e15655 | 3077 | if (step_over_bkpt != null_ptid |
2d97cd35 AT |
3078 | && event_child->stop_reason == TARGET_STOPPED_BY_SW_BREAKPOINT |
3079 | && (event_child->stepping | |
3b9a79ef | 3080 | || !single_step_breakpoint_inserted_here (event_child->stop_pc))) |
8090aef2 | 3081 | { |
dd373349 AT |
3082 | int increment_pc = 0; |
3083 | int breakpoint_kind = 0; | |
3084 | CORE_ADDR stop_pc = event_child->stop_pc; | |
3085 | ||
d16f3f6c TBA |
3086 | breakpoint_kind = breakpoint_kind_from_current_state (&stop_pc); |
3087 | sw_breakpoint_from_kind (breakpoint_kind, &increment_pc); | |
8090aef2 PA |
3088 | |
3089 | if (debug_threads) | |
3090 | { | |
3091 | debug_printf ("step-over for %s executed software breakpoint\n", | |
3092 | target_pid_to_str (ptid_of (current_thread))); | |
3093 | } | |
3094 | ||
3095 | if (increment_pc != 0) | |
3096 | { | |
3097 | struct regcache *regcache | |
3098 | = get_thread_regcache (current_thread, 1); | |
3099 | ||
3100 | event_child->stop_pc += increment_pc; | |
bf9ae9d8 | 3101 | low_set_pc (regcache, event_child->stop_pc); |
8090aef2 | 3102 | |
d7146cda | 3103 | if (!low_breakpoint_at (event_child->stop_pc)) |
15c66dd6 | 3104 | event_child->stop_reason = TARGET_STOPPED_BY_NO_REASON; |
8090aef2 PA |
3105 | } |
3106 | } | |
3107 | ||
6bf5e0ba PA |
3108 | /* If this event was not handled before, and is not a SIGTRAP, we |
3109 | report it. SIGILL and SIGSEGV are also treated as traps in case | |
3110 | a breakpoint is inserted at the current PC. If this target does | |
3111 | not support internal breakpoints at all, we also report the | |
3112 | SIGTRAP without further processing; it's of no concern to us. */ | |
3113 | maybe_internal_trap | |
bf9ae9d8 | 3114 | = (low_supports_breakpoints () |
6bf5e0ba PA |
3115 | && (WSTOPSIG (w) == SIGTRAP |
3116 | || ((WSTOPSIG (w) == SIGILL | |
3117 | || WSTOPSIG (w) == SIGSEGV) | |
d7146cda | 3118 | && low_breakpoint_at (event_child->stop_pc)))); |
6bf5e0ba PA |
3119 | |
3120 | if (maybe_internal_trap) | |
3121 | { | |
3122 | /* Handle anything that requires bookkeeping before deciding to | |
3123 | report the event or continue waiting. */ | |
3124 | ||
3125 | /* First check if we can explain the SIGTRAP with an internal | |
3126 | breakpoint, or if we should possibly report the event to GDB. | |
3127 | Do this before anything that may remove or insert a | |
3128 | breakpoint. */ | |
3129 | bp_explains_trap = breakpoint_inserted_here (event_child->stop_pc); | |
3130 | ||
3131 | /* We have a SIGTRAP, possibly a step-over dance has just | |
3132 | finished. If so, tweak the state machine accordingly, | |
3b9a79ef YQ |
3133 | reinsert breakpoints and delete any single-step |
3134 | breakpoints. */ | |
6bf5e0ba PA |
3135 | step_over_finished = finish_step_over (event_child); |
3136 | ||
3137 | /* Now invoke the callbacks of any internal breakpoints there. */ | |
3138 | check_breakpoints (event_child->stop_pc); | |
3139 | ||
219f2f23 PA |
3140 | /* Handle tracepoint data collecting. This may overflow the |
3141 | trace buffer, and cause a tracing stop, removing | |
3142 | breakpoints. */ | |
3143 | trace_event = handle_tracepoints (event_child); | |
3144 | ||
6bf5e0ba PA |
3145 | if (bp_explains_trap) |
3146 | { | |
6bf5e0ba | 3147 | if (debug_threads) |
87ce2a04 | 3148 | debug_printf ("Hit a gdbserver breakpoint.\n"); |
6bf5e0ba PA |
3149 | } |
3150 | } | |
3151 | else | |
3152 | { | |
3153 | /* We have some other signal, possibly a step-over dance was in | |
3154 | progress, and it should be cancelled too. */ | |
3155 | step_over_finished = finish_step_over (event_child); | |
fa593d66 PA |
3156 | } |
3157 | ||
3158 | /* We have all the data we need. Either report the event to GDB, or | |
3159 | resume threads and keep waiting for more. */ | |
3160 | ||
3161 | /* If we're collecting a fast tracepoint, finish the collection and | |
3162 | move out of the jump pad before delivering a signal. See | |
3163 | linux_stabilize_threads. */ | |
3164 | ||
3165 | if (WIFSTOPPED (w) | |
3166 | && WSTOPSIG (w) != SIGTRAP | |
3167 | && supports_fast_tracepoints () | |
58b4daa5 | 3168 | && agent_loaded_p ()) |
fa593d66 PA |
3169 | { |
3170 | if (debug_threads) | |
87ce2a04 DE |
3171 | debug_printf ("Got signal %d for LWP %ld. Check if we need " |
3172 | "to defer or adjust it.\n", | |
0bfdf32f | 3173 | WSTOPSIG (w), lwpid_of (current_thread)); |
fa593d66 PA |
3174 | |
3175 | /* Allow debugging the jump pad itself. */ | |
0bfdf32f | 3176 | if (current_thread->last_resume_kind != resume_step |
fa593d66 PA |
3177 | && maybe_move_out_of_jump_pad (event_child, &w)) |
3178 | { | |
3179 | enqueue_one_deferred_signal (event_child, &w); | |
3180 | ||
3181 | if (debug_threads) | |
87ce2a04 | 3182 | debug_printf ("Signal %d for LWP %ld deferred (in jump pad)\n", |
0bfdf32f | 3183 | WSTOPSIG (w), lwpid_of (current_thread)); |
fa593d66 | 3184 | |
df95181f | 3185 | resume_one_lwp (event_child, 0, 0, NULL); |
582511be | 3186 | |
edeeb602 YQ |
3187 | if (debug_threads) |
3188 | debug_exit (); | |
582511be | 3189 | return ignore_event (ourstatus); |
fa593d66 PA |
3190 | } |
3191 | } | |
219f2f23 | 3192 | |
229d26fc SM |
3193 | if (event_child->collecting_fast_tracepoint |
3194 | != fast_tpoint_collect_result::not_collecting) | |
fa593d66 PA |
3195 | { |
3196 | if (debug_threads) | |
87ce2a04 DE |
3197 | debug_printf ("LWP %ld was trying to move out of the jump pad (%d). " |
3198 | "Check if we're already there.\n", | |
0bfdf32f | 3199 | lwpid_of (current_thread), |
229d26fc | 3200 | (int) event_child->collecting_fast_tracepoint); |
fa593d66 PA |
3201 | |
3202 | trace_event = 1; | |
3203 | ||
3204 | event_child->collecting_fast_tracepoint | |
3205 | = linux_fast_tracepoint_collecting (event_child, NULL); | |
3206 | ||
229d26fc SM |
3207 | if (event_child->collecting_fast_tracepoint |
3208 | != fast_tpoint_collect_result::before_insn) | |
fa593d66 PA |
3209 | { |
3210 | /* No longer need this breakpoint. */ | |
3211 | if (event_child->exit_jump_pad_bkpt != NULL) | |
3212 | { | |
3213 | if (debug_threads) | |
87ce2a04 DE |
3214 | debug_printf ("No longer need exit-jump-pad bkpt; removing it." |
3215 | "stopping all threads momentarily.\n"); | |
fa593d66 PA |
3216 | |
3217 | /* Other running threads could hit this breakpoint. | |
3218 | We don't handle moribund locations like GDB does, | |
3219 | instead we always pause all threads when removing | |
3220 | breakpoints, so that any step-over or | |
3221 | decr_pc_after_break adjustment is always taken | |
3222 | care of while the breakpoint is still | |
3223 | inserted. */ | |
3224 | stop_all_lwps (1, event_child); | |
fa593d66 PA |
3225 | |
3226 | delete_breakpoint (event_child->exit_jump_pad_bkpt); | |
3227 | event_child->exit_jump_pad_bkpt = NULL; | |
3228 | ||
3229 | unstop_all_lwps (1, event_child); | |
3230 | ||
3231 | gdb_assert (event_child->suspended >= 0); | |
3232 | } | |
3233 | } | |
3234 | ||
229d26fc SM |
3235 | if (event_child->collecting_fast_tracepoint |
3236 | == fast_tpoint_collect_result::not_collecting) | |
fa593d66 PA |
3237 | { |
3238 | if (debug_threads) | |
87ce2a04 DE |
3239 | debug_printf ("fast tracepoint finished " |
3240 | "collecting successfully.\n"); | |
fa593d66 PA |
3241 | |
3242 | /* We may have a deferred signal to report. */ | |
3243 | if (dequeue_one_deferred_signal (event_child, &w)) | |
3244 | { | |
3245 | if (debug_threads) | |
87ce2a04 | 3246 | debug_printf ("dequeued one signal.\n"); |
fa593d66 | 3247 | } |
3c11dd79 | 3248 | else |
fa593d66 | 3249 | { |
3c11dd79 | 3250 | if (debug_threads) |
87ce2a04 | 3251 | debug_printf ("no deferred signals.\n"); |
fa593d66 PA |
3252 | |
3253 | if (stabilizing_threads) | |
3254 | { | |
3255 | ourstatus->kind = TARGET_WAITKIND_STOPPED; | |
a493e3e2 | 3256 | ourstatus->value.sig = GDB_SIGNAL_0; |
87ce2a04 DE |
3257 | |
3258 | if (debug_threads) | |
3259 | { | |
d16f3f6c | 3260 | debug_printf ("wait_1 ret = %s, stopped " |
87ce2a04 | 3261 | "while stabilizing threads\n", |
0bfdf32f | 3262 | target_pid_to_str (ptid_of (current_thread))); |
87ce2a04 DE |
3263 | debug_exit (); |
3264 | } | |
3265 | ||
0bfdf32f | 3266 | return ptid_of (current_thread); |
fa593d66 PA |
3267 | } |
3268 | } | |
3269 | } | |
6bf5e0ba PA |
3270 | } |
3271 | ||
e471f25b PA |
3272 | /* Check whether GDB would be interested in this event. */ |
3273 | ||
82075af2 JS |
3274 | /* Check if GDB is interested in this syscall. */ |
3275 | if (WIFSTOPPED (w) | |
3276 | && WSTOPSIG (w) == SYSCALL_SIGTRAP | |
9eedd27d | 3277 | && !gdb_catch_this_syscall (event_child)) |
82075af2 JS |
3278 | { |
3279 | if (debug_threads) | |
3280 | { | |
3281 | debug_printf ("Ignored syscall for LWP %ld.\n", | |
3282 | lwpid_of (current_thread)); | |
3283 | } | |
3284 | ||
df95181f | 3285 | resume_one_lwp (event_child, event_child->stepping, 0, NULL); |
edeeb602 YQ |
3286 | |
3287 | if (debug_threads) | |
3288 | debug_exit (); | |
82075af2 JS |
3289 | return ignore_event (ourstatus); |
3290 | } | |
3291 | ||
e471f25b PA |
3292 | /* If GDB is not interested in this signal, don't stop other |
3293 | threads, and don't report it to GDB. Just resume the inferior | |
3294 | right away. We do this for threading-related signals as well as | |
3295 | any that GDB specifically requested we ignore. But never ignore | |
3296 | SIGSTOP if we sent it ourselves, and do not ignore signals when | |
3297 | stepping - they may require special handling to skip the signal | |
c9587f88 AT |
3298 | handler. Also never ignore signals that could be caused by a |
3299 | breakpoint. */ | |
e471f25b | 3300 | if (WIFSTOPPED (w) |
0bfdf32f | 3301 | && current_thread->last_resume_kind != resume_step |
e471f25b | 3302 | && ( |
1a981360 | 3303 | #if defined (USE_THREAD_DB) && !defined (__ANDROID__) |
fe978cb0 | 3304 | (current_process ()->priv->thread_db != NULL |
e471f25b PA |
3305 | && (WSTOPSIG (w) == __SIGRTMIN |
3306 | || WSTOPSIG (w) == __SIGRTMIN + 1)) | |
3307 | || | |
3308 | #endif | |
c12a5089 | 3309 | (cs.pass_signals[gdb_signal_from_host (WSTOPSIG (w))] |
e471f25b | 3310 | && !(WSTOPSIG (w) == SIGSTOP |
c9587f88 AT |
3311 | && current_thread->last_resume_kind == resume_stop) |
3312 | && !linux_wstatus_maybe_breakpoint (w)))) | |
e471f25b PA |
3313 | { |
3314 | siginfo_t info, *info_p; | |
3315 | ||
3316 | if (debug_threads) | |
87ce2a04 | 3317 | debug_printf ("Ignored signal %d for LWP %ld.\n", |
0bfdf32f | 3318 | WSTOPSIG (w), lwpid_of (current_thread)); |
e471f25b | 3319 | |
0bfdf32f | 3320 | if (ptrace (PTRACE_GETSIGINFO, lwpid_of (current_thread), |
b8e1b30e | 3321 | (PTRACE_TYPE_ARG3) 0, &info) == 0) |
e471f25b PA |
3322 | info_p = &info; |
3323 | else | |
3324 | info_p = NULL; | |
863d01bd PA |
3325 | |
3326 | if (step_over_finished) | |
3327 | { | |
3328 | /* We cancelled this thread's step-over above. We still | |
3329 | need to unsuspend all other LWPs, and set them back | |
3330 | running again while the signal handler runs. */ | |
3331 | unsuspend_all_lwps (event_child); | |
3332 | ||
3333 | /* Enqueue the pending signal info so that proceed_all_lwps | |
3334 | doesn't lose it. */ | |
3335 | enqueue_pending_signal (event_child, WSTOPSIG (w), info_p); | |
3336 | ||
3337 | proceed_all_lwps (); | |
3338 | } | |
3339 | else | |
3340 | { | |
df95181f TBA |
3341 | resume_one_lwp (event_child, event_child->stepping, |
3342 | WSTOPSIG (w), info_p); | |
863d01bd | 3343 | } |
edeeb602 YQ |
3344 | |
3345 | if (debug_threads) | |
3346 | debug_exit (); | |
3347 | ||
582511be | 3348 | return ignore_event (ourstatus); |
e471f25b PA |
3349 | } |
3350 | ||
c2d6af84 PA |
3351 | /* Note that all addresses are always "out of the step range" when |
3352 | there's no range to begin with. */ | |
3353 | in_step_range = lwp_in_step_range (event_child); | |
3354 | ||
3355 | /* If GDB wanted this thread to single step, and the thread is out | |
3356 | of the step range, we always want to report the SIGTRAP, and let | |
3357 | GDB handle it. Watchpoints should always be reported. So should | |
3358 | signals we can't explain. A SIGTRAP we can't explain could be a | |
3359 | GDB breakpoint --- we may or not support Z0 breakpoints. If we | |
3360 | do, we're be able to handle GDB breakpoints on top of internal | |
3361 | breakpoints, by handling the internal breakpoint and still | |
3362 | reporting the event to GDB. If we don't, we're out of luck, GDB | |
863d01bd PA |
3363 | won't see the breakpoint hit. If we see a single-step event but |
3364 | the thread should be continuing, don't pass the trap to gdb. | |
3365 | That indicates that we had previously finished a single-step but | |
3366 | left the single-step pending -- see | |
3367 | complete_ongoing_step_over. */ | |
6bf5e0ba | 3368 | report_to_gdb = (!maybe_internal_trap |
0bfdf32f | 3369 | || (current_thread->last_resume_kind == resume_step |
c2d6af84 | 3370 | && !in_step_range) |
15c66dd6 | 3371 | || event_child->stop_reason == TARGET_STOPPED_BY_WATCHPOINT |
863d01bd PA |
3372 | || (!in_step_range |
3373 | && !bp_explains_trap | |
3374 | && !trace_event | |
3375 | && !step_over_finished | |
3376 | && !(current_thread->last_resume_kind == resume_continue | |
3377 | && event_child->stop_reason == TARGET_STOPPED_BY_SINGLE_STEP)) | |
9f3a5c85 | 3378 | || (gdb_breakpoint_here (event_child->stop_pc) |
d3ce09f5 | 3379 | && gdb_condition_true_at_breakpoint (event_child->stop_pc) |
de0d863e | 3380 | && gdb_no_commands_at_breakpoint (event_child->stop_pc)) |
00db26fa | 3381 | || event_child->waitstatus.kind != TARGET_WAITKIND_IGNORE); |
d3ce09f5 SS |
3382 | |
3383 | run_breakpoint_commands (event_child->stop_pc); | |
6bf5e0ba PA |
3384 | |
3385 | /* We found no reason GDB would want us to stop. We either hit one | |
3386 | of our own breakpoints, or finished an internal step GDB | |
3387 | shouldn't know about. */ | |
3388 | if (!report_to_gdb) | |
3389 | { | |
3390 | if (debug_threads) | |
3391 | { | |
3392 | if (bp_explains_trap) | |
87ce2a04 | 3393 | debug_printf ("Hit a gdbserver breakpoint.\n"); |
6bf5e0ba | 3394 | if (step_over_finished) |
87ce2a04 | 3395 | debug_printf ("Step-over finished.\n"); |
219f2f23 | 3396 | if (trace_event) |
87ce2a04 | 3397 | debug_printf ("Tracepoint event.\n"); |
c2d6af84 | 3398 | if (lwp_in_step_range (event_child)) |
87ce2a04 DE |
3399 | debug_printf ("Range stepping pc 0x%s [0x%s, 0x%s).\n", |
3400 | paddress (event_child->stop_pc), | |
3401 | paddress (event_child->step_range_start), | |
3402 | paddress (event_child->step_range_end)); | |
6bf5e0ba PA |
3403 | } |
3404 | ||
3405 | /* We're not reporting this breakpoint to GDB, so apply the | |
3406 | decr_pc_after_break adjustment to the inferior's regcache | |
3407 | ourselves. */ | |
3408 | ||
bf9ae9d8 | 3409 | if (low_supports_breakpoints ()) |
6bf5e0ba PA |
3410 | { |
3411 | struct regcache *regcache | |
0bfdf32f | 3412 | = get_thread_regcache (current_thread, 1); |
bf9ae9d8 | 3413 | low_set_pc (regcache, event_child->stop_pc); |
6bf5e0ba PA |
3414 | } |
3415 | ||
7984d532 | 3416 | if (step_over_finished) |
e3652c84 YQ |
3417 | { |
3418 | /* If we have finished stepping over a breakpoint, we've | |
3419 | stopped and suspended all LWPs momentarily except the | |
3420 | stepping one. This is where we resume them all again. | |
3421 | We're going to keep waiting, so use proceed, which | |
3422 | handles stepping over the next breakpoint. */ | |
3423 | unsuspend_all_lwps (event_child); | |
3424 | } | |
3425 | else | |
3426 | { | |
3427 | /* Remove the single-step breakpoints if any. Note that | |
3428 | there isn't single-step breakpoint if we finished stepping | |
3429 | over. */ | |
7582c77c | 3430 | if (supports_software_single_step () |
e3652c84 YQ |
3431 | && has_single_step_breakpoints (current_thread)) |
3432 | { | |
3433 | stop_all_lwps (0, event_child); | |
3434 | delete_single_step_breakpoints (current_thread); | |
3435 | unstop_all_lwps (0, event_child); | |
3436 | } | |
3437 | } | |
7984d532 | 3438 | |
e3652c84 YQ |
3439 | if (debug_threads) |
3440 | debug_printf ("proceeding all threads.\n"); | |
6bf5e0ba | 3441 | proceed_all_lwps (); |
edeeb602 YQ |
3442 | |
3443 | if (debug_threads) | |
3444 | debug_exit (); | |
3445 | ||
582511be | 3446 | return ignore_event (ourstatus); |
6bf5e0ba PA |
3447 | } |
3448 | ||
3449 | if (debug_threads) | |
3450 | { | |
00db26fa | 3451 | if (event_child->waitstatus.kind != TARGET_WAITKIND_IGNORE) |
ad071a30 | 3452 | { |
23fdd69e SM |
3453 | std::string str |
3454 | = target_waitstatus_to_string (&event_child->waitstatus); | |
ad071a30 | 3455 | |
ad071a30 | 3456 | debug_printf ("LWP %ld: extended event with waitstatus %s\n", |
23fdd69e | 3457 | lwpid_of (get_lwp_thread (event_child)), str.c_str ()); |
ad071a30 | 3458 | } |
0bfdf32f | 3459 | if (current_thread->last_resume_kind == resume_step) |
c2d6af84 PA |
3460 | { |
3461 | if (event_child->step_range_start == event_child->step_range_end) | |
87ce2a04 | 3462 | debug_printf ("GDB wanted to single-step, reporting event.\n"); |
c2d6af84 | 3463 | else if (!lwp_in_step_range (event_child)) |
87ce2a04 | 3464 | debug_printf ("Out of step range, reporting event.\n"); |
c2d6af84 | 3465 | } |
15c66dd6 | 3466 | if (event_child->stop_reason == TARGET_STOPPED_BY_WATCHPOINT) |
87ce2a04 | 3467 | debug_printf ("Stopped by watchpoint.\n"); |
582511be | 3468 | else if (gdb_breakpoint_here (event_child->stop_pc)) |
87ce2a04 | 3469 | debug_printf ("Stopped by GDB breakpoint.\n"); |
6bf5e0ba | 3470 | if (debug_threads) |
87ce2a04 | 3471 | debug_printf ("Hit a non-gdbserver trap event.\n"); |
6bf5e0ba PA |
3472 | } |
3473 | ||
3474 | /* Alright, we're going to report a stop. */ | |
3475 | ||
3b9a79ef | 3476 | /* Remove single-step breakpoints. */ |
7582c77c | 3477 | if (supports_software_single_step ()) |
8901d193 | 3478 | { |
3b9a79ef | 3479 | /* Remove single-step breakpoints or not. It it is true, stop all |
8901d193 YQ |
3480 | lwps, so that other threads won't hit the breakpoint in the |
3481 | staled memory. */ | |
3b9a79ef | 3482 | int remove_single_step_breakpoints_p = 0; |
8901d193 YQ |
3483 | |
3484 | if (non_stop) | |
3485 | { | |
3b9a79ef YQ |
3486 | remove_single_step_breakpoints_p |
3487 | = has_single_step_breakpoints (current_thread); | |
8901d193 YQ |
3488 | } |
3489 | else | |
3490 | { | |
3491 | /* In all-stop, a stop reply cancels all previous resume | |
3b9a79ef | 3492 | requests. Delete all single-step breakpoints. */ |
8901d193 | 3493 | |
9c80ecd6 SM |
3494 | find_thread ([&] (thread_info *thread) { |
3495 | if (has_single_step_breakpoints (thread)) | |
3496 | { | |
3497 | remove_single_step_breakpoints_p = 1; | |
3498 | return true; | |
3499 | } | |
8901d193 | 3500 | |
9c80ecd6 SM |
3501 | return false; |
3502 | }); | |
8901d193 YQ |
3503 | } |
3504 | ||
3b9a79ef | 3505 | if (remove_single_step_breakpoints_p) |
8901d193 | 3506 | { |
3b9a79ef | 3507 | /* If we remove single-step breakpoints from memory, stop all lwps, |
8901d193 YQ |
3508 | so that other threads won't hit the breakpoint in the staled |
3509 | memory. */ | |
3510 | stop_all_lwps (0, event_child); | |
3511 | ||
3512 | if (non_stop) | |
3513 | { | |
3b9a79ef YQ |
3514 | gdb_assert (has_single_step_breakpoints (current_thread)); |
3515 | delete_single_step_breakpoints (current_thread); | |
8901d193 YQ |
3516 | } |
3517 | else | |
3518 | { | |
9c80ecd6 SM |
3519 | for_each_thread ([] (thread_info *thread){ |
3520 | if (has_single_step_breakpoints (thread)) | |
3521 | delete_single_step_breakpoints (thread); | |
3522 | }); | |
8901d193 YQ |
3523 | } |
3524 | ||
3525 | unstop_all_lwps (0, event_child); | |
3526 | } | |
3527 | } | |
3528 | ||
582511be | 3529 | if (!stabilizing_threads) |
6bf5e0ba PA |
3530 | { |
3531 | /* In all-stop, stop all threads. */ | |
582511be PA |
3532 | if (!non_stop) |
3533 | stop_all_lwps (0, NULL); | |
6bf5e0ba | 3534 | |
c03e6ccc | 3535 | if (step_over_finished) |
582511be PA |
3536 | { |
3537 | if (!non_stop) | |
3538 | { | |
3539 | /* If we were doing a step-over, all other threads but | |
3540 | the stepping one had been paused in start_step_over, | |
3541 | with their suspend counts incremented. We don't want | |
3542 | to do a full unstop/unpause, because we're in | |
3543 | all-stop mode (so we want threads stopped), but we | |
3544 | still need to unsuspend the other threads, to | |
3545 | decrement their `suspended' count back. */ | |
3546 | unsuspend_all_lwps (event_child); | |
3547 | } | |
3548 | else | |
3549 | { | |
3550 | /* If we just finished a step-over, then all threads had | |
3551 | been momentarily paused. In all-stop, that's fine, | |
3552 | we want threads stopped by now anyway. In non-stop, | |
3553 | we need to re-resume threads that GDB wanted to be | |
3554 | running. */ | |
3555 | unstop_all_lwps (1, event_child); | |
3556 | } | |
3557 | } | |
c03e6ccc | 3558 | |
3aa5cfa0 AT |
3559 | /* If we're not waiting for a specific LWP, choose an event LWP |
3560 | from among those that have had events. Giving equal priority | |
3561 | to all LWPs that have had events helps prevent | |
3562 | starvation. */ | |
d7e15655 | 3563 | if (ptid == minus_one_ptid) |
3aa5cfa0 AT |
3564 | { |
3565 | event_child->status_pending_p = 1; | |
3566 | event_child->status_pending = w; | |
3567 | ||
3568 | select_event_lwp (&event_child); | |
3569 | ||
3570 | /* current_thread and event_child must stay in sync. */ | |
3571 | current_thread = get_lwp_thread (event_child); | |
3572 | ||
3573 | event_child->status_pending_p = 0; | |
3574 | w = event_child->status_pending; | |
3575 | } | |
3576 | ||
3577 | ||
fa593d66 | 3578 | /* Stabilize threads (move out of jump pads). */ |
582511be | 3579 | if (!non_stop) |
5c9eb2f2 | 3580 | target_stabilize_threads (); |
6bf5e0ba PA |
3581 | } |
3582 | else | |
3583 | { | |
3584 | /* If we just finished a step-over, then all threads had been | |
3585 | momentarily paused. In all-stop, that's fine, we want | |
3586 | threads stopped by now anyway. In non-stop, we need to | |
3587 | re-resume threads that GDB wanted to be running. */ | |
3588 | if (step_over_finished) | |
7984d532 | 3589 | unstop_all_lwps (1, event_child); |
6bf5e0ba PA |
3590 | } |
3591 | ||
00db26fa | 3592 | if (event_child->waitstatus.kind != TARGET_WAITKIND_IGNORE) |
de0d863e | 3593 | { |
00db26fa PA |
3594 | /* If the reported event is an exit, fork, vfork or exec, let |
3595 | GDB know. */ | |
5a04c4cf PA |
3596 | |
3597 | /* Break the unreported fork relationship chain. */ | |
3598 | if (event_child->waitstatus.kind == TARGET_WAITKIND_FORKED | |
3599 | || event_child->waitstatus.kind == TARGET_WAITKIND_VFORKED) | |
3600 | { | |
3601 | event_child->fork_relative->fork_relative = NULL; | |
3602 | event_child->fork_relative = NULL; | |
3603 | } | |
3604 | ||
00db26fa | 3605 | *ourstatus = event_child->waitstatus; |
de0d863e DB |
3606 | /* Clear the event lwp's waitstatus since we handled it already. */ |
3607 | event_child->waitstatus.kind = TARGET_WAITKIND_IGNORE; | |
3608 | } | |
3609 | else | |
3610 | ourstatus->kind = TARGET_WAITKIND_STOPPED; | |
5b1c542e | 3611 | |
582511be | 3612 | /* Now that we've selected our final event LWP, un-adjust its PC if |
3e572f71 PA |
3613 | it was a software breakpoint, and the client doesn't know we can |
3614 | adjust the breakpoint ourselves. */ | |
3615 | if (event_child->stop_reason == TARGET_STOPPED_BY_SW_BREAKPOINT | |
c12a5089 | 3616 | && !cs.swbreak_feature) |
582511be | 3617 | { |
d4807ea2 | 3618 | int decr_pc = low_decr_pc_after_break (); |
582511be PA |
3619 | |
3620 | if (decr_pc != 0) | |
3621 | { | |
3622 | struct regcache *regcache | |
3623 | = get_thread_regcache (current_thread, 1); | |
bf9ae9d8 | 3624 | low_set_pc (regcache, event_child->stop_pc + decr_pc); |
582511be PA |
3625 | } |
3626 | } | |
3627 | ||
82075af2 JS |
3628 | if (WSTOPSIG (w) == SYSCALL_SIGTRAP) |
3629 | { | |
82075af2 | 3630 | get_syscall_trapinfo (event_child, |
4cc32bec | 3631 | &ourstatus->value.syscall_number); |
82075af2 JS |
3632 | ourstatus->kind = event_child->syscall_state; |
3633 | } | |
3634 | else if (current_thread->last_resume_kind == resume_stop | |
3635 | && WSTOPSIG (w) == SIGSTOP) | |
bd99dc85 PA |
3636 | { |
3637 | /* A thread that has been requested to stop by GDB with vCont;t, | |
3638 | and it stopped cleanly, so report as SIG0. The use of | |
3639 | SIGSTOP is an implementation detail. */ | |
a493e3e2 | 3640 | ourstatus->value.sig = GDB_SIGNAL_0; |
bd99dc85 | 3641 | } |
0bfdf32f | 3642 | else if (current_thread->last_resume_kind == resume_stop |
8336d594 | 3643 | && WSTOPSIG (w) != SIGSTOP) |
bd99dc85 PA |
3644 | { |
3645 | /* A thread that has been requested to stop by GDB with vCont;t, | |
d50171e4 | 3646 | but, it stopped for other reasons. */ |
2ea28649 | 3647 | ourstatus->value.sig = gdb_signal_from_host (WSTOPSIG (w)); |
bd99dc85 | 3648 | } |
de0d863e | 3649 | else if (ourstatus->kind == TARGET_WAITKIND_STOPPED) |
bd99dc85 | 3650 | { |
2ea28649 | 3651 | ourstatus->value.sig = gdb_signal_from_host (WSTOPSIG (w)); |
bd99dc85 PA |
3652 | } |
3653 | ||
d7e15655 | 3654 | gdb_assert (step_over_bkpt == null_ptid); |
d50171e4 | 3655 | |
bd99dc85 | 3656 | if (debug_threads) |
87ce2a04 | 3657 | { |
d16f3f6c | 3658 | debug_printf ("wait_1 ret = %s, %d, %d\n", |
0bfdf32f | 3659 | target_pid_to_str (ptid_of (current_thread)), |
87ce2a04 DE |
3660 | ourstatus->kind, ourstatus->value.sig); |
3661 | debug_exit (); | |
3662 | } | |
bd99dc85 | 3663 | |
65706a29 PA |
3664 | if (ourstatus->kind == TARGET_WAITKIND_EXITED) |
3665 | return filter_exit_event (event_child, ourstatus); | |
3666 | ||
0bfdf32f | 3667 | return ptid_of (current_thread); |
bd99dc85 PA |
3668 | } |
3669 | ||
3670 | /* Get rid of any pending event in the pipe. */ | |
3671 | static void | |
3672 | async_file_flush (void) | |
3673 | { | |
3674 | int ret; | |
3675 | char buf; | |
3676 | ||
3677 | do | |
3678 | ret = read (linux_event_pipe[0], &buf, 1); | |
3679 | while (ret >= 0 || (ret == -1 && errno == EINTR)); | |
3680 | } | |
3681 | ||
3682 | /* Put something in the pipe, so the event loop wakes up. */ | |
3683 | static void | |
3684 | async_file_mark (void) | |
3685 | { | |
3686 | int ret; | |
3687 | ||
3688 | async_file_flush (); | |
3689 | ||
3690 | do | |
3691 | ret = write (linux_event_pipe[1], "+", 1); | |
3692 | while (ret == 0 || (ret == -1 && errno == EINTR)); | |
3693 | ||
3694 | /* Ignore EAGAIN. If the pipe is full, the event loop will already | |
3695 | be awakened anyway. */ | |
3696 | } | |
3697 | ||
6532e7e3 TBA |
3698 | ptid_t |
3699 | linux_process_target::wait (ptid_t ptid, | |
3700 | target_waitstatus *ourstatus, | |
b60cea74 | 3701 | target_wait_flags target_options) |
bd99dc85 | 3702 | { |
95954743 | 3703 | ptid_t event_ptid; |
bd99dc85 | 3704 | |
bd99dc85 PA |
3705 | /* Flush the async file first. */ |
3706 | if (target_is_async_p ()) | |
3707 | async_file_flush (); | |
3708 | ||
582511be PA |
3709 | do |
3710 | { | |
d16f3f6c | 3711 | event_ptid = wait_1 (ptid, ourstatus, target_options); |
582511be PA |
3712 | } |
3713 | while ((target_options & TARGET_WNOHANG) == 0 | |
d7e15655 | 3714 | && event_ptid == null_ptid |
582511be | 3715 | && ourstatus->kind == TARGET_WAITKIND_IGNORE); |
bd99dc85 PA |
3716 | |
3717 | /* If at least one stop was reported, there may be more. A single | |
3718 | SIGCHLD can signal more than one child stop. */ | |
3719 | if (target_is_async_p () | |
3720 | && (target_options & TARGET_WNOHANG) != 0 | |
d7e15655 | 3721 | && event_ptid != null_ptid) |
bd99dc85 PA |
3722 | async_file_mark (); |
3723 | ||
3724 | return event_ptid; | |
da6d8c04 DJ |
3725 | } |
3726 | ||
c5f62d5f | 3727 | /* Send a signal to an LWP. */ |
fd500816 DJ |
3728 | |
3729 | static int | |
a1928bad | 3730 | kill_lwp (unsigned long lwpid, int signo) |
fd500816 | 3731 | { |
4a6ed09b | 3732 | int ret; |
fd500816 | 3733 | |
4a6ed09b PA |
3734 | errno = 0; |
3735 | ret = syscall (__NR_tkill, lwpid, signo); | |
3736 | if (errno == ENOSYS) | |
3737 | { | |
3738 | /* If tkill fails, then we are not using nptl threads, a | |
3739 | configuration we no longer support. */ | |
3740 | perror_with_name (("tkill")); | |
3741 | } | |
3742 | return ret; | |
fd500816 DJ |
3743 | } |
3744 | ||
964e4306 PA |
3745 | void |
3746 | linux_stop_lwp (struct lwp_info *lwp) | |
3747 | { | |
3748 | send_sigstop (lwp); | |
3749 | } | |
3750 | ||
0d62e5e8 | 3751 | static void |
02fc4de7 | 3752 | send_sigstop (struct lwp_info *lwp) |
0d62e5e8 | 3753 | { |
bd99dc85 | 3754 | int pid; |
0d62e5e8 | 3755 | |
d86d4aaf | 3756 | pid = lwpid_of (get_lwp_thread (lwp)); |
bd99dc85 | 3757 | |
0d62e5e8 DJ |
3758 | /* If we already have a pending stop signal for this process, don't |
3759 | send another. */ | |
54a0b537 | 3760 | if (lwp->stop_expected) |
0d62e5e8 | 3761 | { |
ae13219e | 3762 | if (debug_threads) |
87ce2a04 | 3763 | debug_printf ("Have pending sigstop for lwp %d\n", pid); |
ae13219e | 3764 | |
0d62e5e8 DJ |
3765 | return; |
3766 | } | |
3767 | ||
3768 | if (debug_threads) | |
87ce2a04 | 3769 | debug_printf ("Sending sigstop to lwp %d\n", pid); |
0d62e5e8 | 3770 | |
d50171e4 | 3771 | lwp->stop_expected = 1; |
bd99dc85 | 3772 | kill_lwp (pid, SIGSTOP); |
0d62e5e8 DJ |
3773 | } |
3774 | ||
df3e4dbe SM |
3775 | static void |
3776 | send_sigstop (thread_info *thread, lwp_info *except) | |
02fc4de7 | 3777 | { |
d86d4aaf | 3778 | struct lwp_info *lwp = get_thread_lwp (thread); |
02fc4de7 | 3779 | |
7984d532 PA |
3780 | /* Ignore EXCEPT. */ |
3781 | if (lwp == except) | |
df3e4dbe | 3782 | return; |
7984d532 | 3783 | |
02fc4de7 | 3784 | if (lwp->stopped) |
df3e4dbe | 3785 | return; |
02fc4de7 PA |
3786 | |
3787 | send_sigstop (lwp); | |
7984d532 PA |
3788 | } |
3789 | ||
3790 | /* Increment the suspend count of an LWP, and stop it, if not stopped | |
3791 | yet. */ | |
df3e4dbe SM |
3792 | static void |
3793 | suspend_and_send_sigstop (thread_info *thread, lwp_info *except) | |
7984d532 | 3794 | { |
d86d4aaf | 3795 | struct lwp_info *lwp = get_thread_lwp (thread); |
7984d532 PA |
3796 | |
3797 | /* Ignore EXCEPT. */ | |
3798 | if (lwp == except) | |
df3e4dbe | 3799 | return; |
7984d532 | 3800 | |
863d01bd | 3801 | lwp_suspended_inc (lwp); |
7984d532 | 3802 | |
df3e4dbe | 3803 | send_sigstop (thread, except); |
02fc4de7 PA |
3804 | } |
3805 | ||
95954743 PA |
3806 | static void |
3807 | mark_lwp_dead (struct lwp_info *lwp, int wstat) | |
3808 | { | |
95954743 PA |
3809 | /* Store the exit status for later. */ |
3810 | lwp->status_pending_p = 1; | |
3811 | lwp->status_pending = wstat; | |
3812 | ||
00db26fa PA |
3813 | /* Store in waitstatus as well, as there's nothing else to process |
3814 | for this event. */ | |
3815 | if (WIFEXITED (wstat)) | |
3816 | { | |
3817 | lwp->waitstatus.kind = TARGET_WAITKIND_EXITED; | |
3818 | lwp->waitstatus.value.integer = WEXITSTATUS (wstat); | |
3819 | } | |
3820 | else if (WIFSIGNALED (wstat)) | |
3821 | { | |
3822 | lwp->waitstatus.kind = TARGET_WAITKIND_SIGNALLED; | |
3823 | lwp->waitstatus.value.sig = gdb_signal_from_host (WTERMSIG (wstat)); | |
3824 | } | |
3825 | ||
95954743 PA |
3826 | /* Prevent trying to stop it. */ |
3827 | lwp->stopped = 1; | |
3828 | ||
3829 | /* No further stops are expected from a dead lwp. */ | |
3830 | lwp->stop_expected = 0; | |
3831 | } | |
3832 | ||
00db26fa PA |
3833 | /* Return true if LWP has exited already, and has a pending exit event |
3834 | to report to GDB. */ | |
3835 | ||
3836 | static int | |
3837 | lwp_is_marked_dead (struct lwp_info *lwp) | |
3838 | { | |
3839 | return (lwp->status_pending_p | |
3840 | && (WIFEXITED (lwp->status_pending) | |
3841 | || WIFSIGNALED (lwp->status_pending))); | |
3842 | } | |
3843 | ||
d16f3f6c TBA |
3844 | void |
3845 | linux_process_target::wait_for_sigstop () | |
0d62e5e8 | 3846 | { |
0bfdf32f | 3847 | struct thread_info *saved_thread; |
95954743 | 3848 | ptid_t saved_tid; |
fa96cb38 PA |
3849 | int wstat; |
3850 | int ret; | |
0d62e5e8 | 3851 | |
0bfdf32f GB |
3852 | saved_thread = current_thread; |
3853 | if (saved_thread != NULL) | |
9c80ecd6 | 3854 | saved_tid = saved_thread->id; |
bd99dc85 | 3855 | else |
95954743 | 3856 | saved_tid = null_ptid; /* avoid bogus unused warning */ |
bd99dc85 | 3857 | |
d50171e4 | 3858 | if (debug_threads) |
fa96cb38 | 3859 | debug_printf ("wait_for_sigstop: pulling events\n"); |
d50171e4 | 3860 | |
fa96cb38 PA |
3861 | /* Passing NULL_PTID as filter indicates we want all events to be |
3862 | left pending. Eventually this returns when there are no | |
3863 | unwaited-for children left. */ | |
d16f3f6c | 3864 | ret = wait_for_event_filtered (minus_one_ptid, null_ptid, &wstat, __WALL); |
fa96cb38 | 3865 | gdb_assert (ret == -1); |
0d62e5e8 | 3866 | |
13d3d99b | 3867 | if (saved_thread == NULL || mythread_alive (saved_tid)) |
0bfdf32f | 3868 | current_thread = saved_thread; |
0d62e5e8 DJ |
3869 | else |
3870 | { | |
3871 | if (debug_threads) | |
87ce2a04 | 3872 | debug_printf ("Previously current thread died.\n"); |
0d62e5e8 | 3873 | |
f0db101d PA |
3874 | /* We can't change the current inferior behind GDB's back, |
3875 | otherwise, a subsequent command may apply to the wrong | |
3876 | process. */ | |
3877 | current_thread = NULL; | |
0d62e5e8 DJ |
3878 | } |
3879 | } | |
3880 | ||
13e567af TBA |
3881 | bool |
3882 | linux_process_target::stuck_in_jump_pad (thread_info *thread) | |
fa593d66 | 3883 | { |
d86d4aaf | 3884 | struct lwp_info *lwp = get_thread_lwp (thread); |
fa593d66 | 3885 | |
863d01bd PA |
3886 | if (lwp->suspended != 0) |
3887 | { | |
3888 | internal_error (__FILE__, __LINE__, | |
3889 | "LWP %ld is suspended, suspended=%d\n", | |
3890 | lwpid_of (thread), lwp->suspended); | |
3891 | } | |
fa593d66 PA |
3892 | gdb_assert (lwp->stopped); |
3893 | ||
3894 | /* Allow debugging the jump pad, gdb_collect, etc.. */ | |
3895 | return (supports_fast_tracepoints () | |
58b4daa5 | 3896 | && agent_loaded_p () |
fa593d66 | 3897 | && (gdb_breakpoint_here (lwp->stop_pc) |
15c66dd6 | 3898 | || lwp->stop_reason == TARGET_STOPPED_BY_WATCHPOINT |
fa593d66 | 3899 | || thread->last_resume_kind == resume_step) |
229d26fc SM |
3900 | && (linux_fast_tracepoint_collecting (lwp, NULL) |
3901 | != fast_tpoint_collect_result::not_collecting)); | |
fa593d66 PA |
3902 | } |
3903 | ||
d16f3f6c TBA |
3904 | void |
3905 | linux_process_target::move_out_of_jump_pad (thread_info *thread) | |
fa593d66 | 3906 | { |
f0ce0d3a | 3907 | struct thread_info *saved_thread; |
d86d4aaf | 3908 | struct lwp_info *lwp = get_thread_lwp (thread); |
fa593d66 PA |
3909 | int *wstat; |
3910 | ||
863d01bd PA |
3911 | if (lwp->suspended != 0) |
3912 | { | |
3913 | internal_error (__FILE__, __LINE__, | |
3914 | "LWP %ld is suspended, suspended=%d\n", | |
3915 | lwpid_of (thread), lwp->suspended); | |
3916 | } | |
fa593d66 PA |
3917 | gdb_assert (lwp->stopped); |
3918 | ||
f0ce0d3a PA |
3919 | /* For gdb_breakpoint_here. */ |
3920 | saved_thread = current_thread; | |
3921 | current_thread = thread; | |
3922 | ||
fa593d66 PA |
3923 | wstat = lwp->status_pending_p ? &lwp->status_pending : NULL; |
3924 | ||
3925 | /* Allow debugging the jump pad, gdb_collect, etc. */ | |
3926 | if (!gdb_breakpoint_here (lwp->stop_pc) | |
15c66dd6 | 3927 | && lwp->stop_reason != TARGET_STOPPED_BY_WATCHPOINT |
fa593d66 PA |
3928 | && thread->last_resume_kind != resume_step |
3929 | && maybe_move_out_of_jump_pad (lwp, wstat)) | |
3930 | { | |
3931 | if (debug_threads) | |
87ce2a04 | 3932 | debug_printf ("LWP %ld needs stabilizing (in jump pad)\n", |
d86d4aaf | 3933 | lwpid_of (thread)); |
fa593d66 PA |
3934 | |
3935 | if (wstat) | |
3936 | { | |
3937 | lwp->status_pending_p = 0; | |
3938 | enqueue_one_deferred_signal (lwp, wstat); | |
3939 | ||
3940 | if (debug_threads) | |
87ce2a04 DE |
3941 | debug_printf ("Signal %d for LWP %ld deferred " |
3942 | "(in jump pad)\n", | |
d86d4aaf | 3943 | WSTOPSIG (*wstat), lwpid_of (thread)); |
fa593d66 PA |
3944 | } |
3945 | ||
df95181f | 3946 | resume_one_lwp (lwp, 0, 0, NULL); |
fa593d66 PA |
3947 | } |
3948 | else | |
863d01bd | 3949 | lwp_suspended_inc (lwp); |
f0ce0d3a PA |
3950 | |
3951 | current_thread = saved_thread; | |
fa593d66 PA |
3952 | } |
3953 | ||
5a6b0a41 SM |
3954 | static bool |
3955 | lwp_running (thread_info *thread) | |
fa593d66 | 3956 | { |
d86d4aaf | 3957 | struct lwp_info *lwp = get_thread_lwp (thread); |
fa593d66 | 3958 | |
00db26fa | 3959 | if (lwp_is_marked_dead (lwp)) |
5a6b0a41 SM |
3960 | return false; |
3961 | ||
3962 | return !lwp->stopped; | |
fa593d66 PA |
3963 | } |
3964 | ||
d16f3f6c TBA |
3965 | void |
3966 | linux_process_target::stop_all_lwps (int suspend, lwp_info *except) | |
0d62e5e8 | 3967 | { |
bde24c0a PA |
3968 | /* Should not be called recursively. */ |
3969 | gdb_assert (stopping_threads == NOT_STOPPING_THREADS); | |
3970 | ||
87ce2a04 DE |
3971 | if (debug_threads) |
3972 | { | |
3973 | debug_enter (); | |
3974 | debug_printf ("stop_all_lwps (%s, except=%s)\n", | |
3975 | suspend ? "stop-and-suspend" : "stop", | |
3976 | except != NULL | |
d86d4aaf | 3977 | ? target_pid_to_str (ptid_of (get_lwp_thread (except))) |
87ce2a04 DE |
3978 | : "none"); |
3979 | } | |
3980 | ||
bde24c0a PA |
3981 | stopping_threads = (suspend |
3982 | ? STOPPING_AND_SUSPENDING_THREADS | |
3983 | : STOPPING_THREADS); | |
7984d532 PA |
3984 | |
3985 | if (suspend) | |
df3e4dbe SM |
3986 | for_each_thread ([&] (thread_info *thread) |
3987 | { | |
3988 | suspend_and_send_sigstop (thread, except); | |
3989 | }); | |
7984d532 | 3990 | else |
df3e4dbe SM |
3991 | for_each_thread ([&] (thread_info *thread) |
3992 | { | |
3993 | send_sigstop (thread, except); | |
3994 | }); | |
3995 | ||
fa96cb38 | 3996 | wait_for_sigstop (); |
bde24c0a | 3997 | stopping_threads = NOT_STOPPING_THREADS; |
87ce2a04 DE |
3998 | |
3999 | if (debug_threads) | |
4000 | { | |
4001 | debug_printf ("stop_all_lwps done, setting stopping_threads " | |
4002 | "back to !stopping\n"); | |
4003 | debug_exit (); | |
4004 | } | |
0d62e5e8 DJ |
4005 | } |
4006 | ||
863d01bd PA |
4007 | /* Enqueue one signal in the chain of signals which need to be |
4008 | delivered to this process on next resume. */ | |
4009 | ||
4010 | static void | |
4011 | enqueue_pending_signal (struct lwp_info *lwp, int signal, siginfo_t *info) | |
4012 | { | |
013e3554 TBA |
4013 | lwp->pending_signals.emplace_back (signal); |
4014 | if (info == nullptr) | |
4015 | memset (&lwp->pending_signals.back ().info, 0, sizeof (siginfo_t)); | |
863d01bd | 4016 | else |
013e3554 | 4017 | lwp->pending_signals.back ().info = *info; |
863d01bd PA |
4018 | } |
4019 | ||
df95181f TBA |
4020 | void |
4021 | linux_process_target::install_software_single_step_breakpoints (lwp_info *lwp) | |
fa5308bd | 4022 | { |
984a2c04 YQ |
4023 | struct thread_info *thread = get_lwp_thread (lwp); |
4024 | struct regcache *regcache = get_thread_regcache (thread, 1); | |
8ce47547 TT |
4025 | |
4026 | scoped_restore save_current_thread = make_scoped_restore (¤t_thread); | |
984a2c04 | 4027 | |
984a2c04 | 4028 | current_thread = thread; |
7582c77c | 4029 | std::vector<CORE_ADDR> next_pcs = low_get_next_pcs (regcache); |
fa5308bd | 4030 | |
a0ff9e1a | 4031 | for (CORE_ADDR pc : next_pcs) |
3b9a79ef | 4032 | set_single_step_breakpoint (pc, current_ptid); |
fa5308bd AT |
4033 | } |
4034 | ||
df95181f TBA |
4035 | int |
4036 | linux_process_target::single_step (lwp_info* lwp) | |
7fe5e27e AT |
4037 | { |
4038 | int step = 0; | |
4039 | ||
b31cdfa6 | 4040 | if (supports_hardware_single_step ()) |
7fe5e27e AT |
4041 | { |
4042 | step = 1; | |
4043 | } | |
7582c77c | 4044 | else if (supports_software_single_step ()) |
7fe5e27e AT |
4045 | { |
4046 | install_software_single_step_breakpoints (lwp); | |
4047 | step = 0; | |
4048 | } | |
4049 | else | |
4050 | { | |
4051 | if (debug_threads) | |
4052 | debug_printf ("stepping is not implemented on this target"); | |
4053 | } | |
4054 | ||
4055 | return step; | |
4056 | } | |
4057 | ||
35ac8b3e | 4058 | /* The signal can be delivered to the inferior if we are not trying to |
5b061e98 YQ |
4059 | finish a fast tracepoint collect. Since signal can be delivered in |
4060 | the step-over, the program may go to signal handler and trap again | |
4061 | after return from the signal handler. We can live with the spurious | |
4062 | double traps. */ | |
35ac8b3e YQ |
4063 | |
4064 | static int | |
4065 | lwp_signal_can_be_delivered (struct lwp_info *lwp) | |
4066 | { | |
229d26fc SM |
4067 | return (lwp->collecting_fast_tracepoint |
4068 | == fast_tpoint_collect_result::not_collecting); | |
35ac8b3e YQ |
4069 | } |
4070 | ||
df95181f TBA |
4071 | void |
4072 | linux_process_target::resume_one_lwp_throw (lwp_info *lwp, int step, | |
4073 | int signal, siginfo_t *info) | |
da6d8c04 | 4074 | { |
d86d4aaf | 4075 | struct thread_info *thread = get_lwp_thread (lwp); |
0bfdf32f | 4076 | struct thread_info *saved_thread; |
82075af2 | 4077 | int ptrace_request; |
c06cbd92 YQ |
4078 | struct process_info *proc = get_thread_process (thread); |
4079 | ||
4080 | /* Note that target description may not be initialised | |
4081 | (proc->tdesc == NULL) at this point because the program hasn't | |
4082 | stopped at the first instruction yet. It means GDBserver skips | |
4083 | the extra traps from the wrapper program (see option --wrapper). | |
4084 | Code in this function that requires register access should be | |
4085 | guarded by proc->tdesc == NULL or something else. */ | |
0d62e5e8 | 4086 | |
54a0b537 | 4087 | if (lwp->stopped == 0) |
0d62e5e8 DJ |
4088 | return; |
4089 | ||
65706a29 PA |
4090 | gdb_assert (lwp->waitstatus.kind == TARGET_WAITKIND_IGNORE); |
4091 | ||
229d26fc SM |
4092 | fast_tpoint_collect_result fast_tp_collecting |
4093 | = lwp->collecting_fast_tracepoint; | |
fa593d66 | 4094 | |
229d26fc SM |
4095 | gdb_assert (!stabilizing_threads |
4096 | || (fast_tp_collecting | |
4097 | != fast_tpoint_collect_result::not_collecting)); | |
fa593d66 | 4098 | |
219f2f23 PA |
4099 | /* Cancel actions that rely on GDB not changing the PC (e.g., the |
4100 | user used the "jump" command, or "set $pc = foo"). */ | |
c06cbd92 | 4101 | if (thread->while_stepping != NULL && lwp->stop_pc != get_pc (lwp)) |
219f2f23 PA |
4102 | { |
4103 | /* Collecting 'while-stepping' actions doesn't make sense | |
4104 | anymore. */ | |
d86d4aaf | 4105 | release_while_stepping_state_list (thread); |
219f2f23 PA |
4106 | } |
4107 | ||
0d62e5e8 | 4108 | /* If we have pending signals or status, and a new signal, enqueue the |
35ac8b3e YQ |
4109 | signal. Also enqueue the signal if it can't be delivered to the |
4110 | inferior right now. */ | |
0d62e5e8 | 4111 | if (signal != 0 |
fa593d66 | 4112 | && (lwp->status_pending_p |
013e3554 | 4113 | || !lwp->pending_signals.empty () |
35ac8b3e | 4114 | || !lwp_signal_can_be_delivered (lwp))) |
94610ec4 YQ |
4115 | { |
4116 | enqueue_pending_signal (lwp, signal, info); | |
4117 | ||
4118 | /* Postpone any pending signal. It was enqueued above. */ | |
4119 | signal = 0; | |
4120 | } | |
0d62e5e8 | 4121 | |
d50171e4 PA |
4122 | if (lwp->status_pending_p) |
4123 | { | |
4124 | if (debug_threads) | |
94610ec4 | 4125 | debug_printf ("Not resuming lwp %ld (%s, stop %s);" |
87ce2a04 | 4126 | " has pending status\n", |
94610ec4 | 4127 | lwpid_of (thread), step ? "step" : "continue", |
87ce2a04 | 4128 | lwp->stop_expected ? "expected" : "not expected"); |
d50171e4 PA |
4129 | return; |
4130 | } | |
0d62e5e8 | 4131 | |
0bfdf32f GB |
4132 | saved_thread = current_thread; |
4133 | current_thread = thread; | |
0d62e5e8 | 4134 | |
0d62e5e8 DJ |
4135 | /* This bit needs some thinking about. If we get a signal that |
4136 | we must report while a single-step reinsert is still pending, | |
4137 | we often end up resuming the thread. It might be better to | |
4138 | (ew) allow a stack of pending events; then we could be sure that | |
4139 | the reinsert happened right away and not lose any signals. | |
4140 | ||
4141 | Making this stack would also shrink the window in which breakpoints are | |
54a0b537 | 4142 | uninserted (see comment in linux_wait_for_lwp) but not enough for |
0d62e5e8 DJ |
4143 | complete correctness, so it won't solve that problem. It may be |
4144 | worthwhile just to solve this one, however. */ | |
54a0b537 | 4145 | if (lwp->bp_reinsert != 0) |
0d62e5e8 DJ |
4146 | { |
4147 | if (debug_threads) | |
87ce2a04 DE |
4148 | debug_printf (" pending reinsert at 0x%s\n", |
4149 | paddress (lwp->bp_reinsert)); | |
d50171e4 | 4150 | |
b31cdfa6 | 4151 | if (supports_hardware_single_step ()) |
d50171e4 | 4152 | { |
229d26fc | 4153 | if (fast_tp_collecting == fast_tpoint_collect_result::not_collecting) |
fa593d66 PA |
4154 | { |
4155 | if (step == 0) | |
9986ba08 | 4156 | warning ("BAD - reinserting but not stepping."); |
fa593d66 | 4157 | if (lwp->suspended) |
9986ba08 PA |
4158 | warning ("BAD - reinserting and suspended(%d).", |
4159 | lwp->suspended); | |
fa593d66 | 4160 | } |
d50171e4 | 4161 | } |
f79b145d YQ |
4162 | |
4163 | step = maybe_hw_step (thread); | |
0d62e5e8 DJ |
4164 | } |
4165 | ||
229d26fc | 4166 | if (fast_tp_collecting == fast_tpoint_collect_result::before_insn) |
fa593d66 PA |
4167 | { |
4168 | if (debug_threads) | |
87ce2a04 DE |
4169 | debug_printf ("lwp %ld wants to get out of fast tracepoint jump pad" |
4170 | " (exit-jump-pad-bkpt)\n", | |
d86d4aaf | 4171 | lwpid_of (thread)); |
fa593d66 | 4172 | } |
229d26fc | 4173 | else if (fast_tp_collecting == fast_tpoint_collect_result::at_insn) |
fa593d66 PA |
4174 | { |
4175 | if (debug_threads) | |
87ce2a04 DE |
4176 | debug_printf ("lwp %ld wants to get out of fast tracepoint jump pad" |
4177 | " single-stepping\n", | |
d86d4aaf | 4178 | lwpid_of (thread)); |
fa593d66 | 4179 | |
b31cdfa6 | 4180 | if (supports_hardware_single_step ()) |
fa593d66 PA |
4181 | step = 1; |
4182 | else | |
38e08fca GB |
4183 | { |
4184 | internal_error (__FILE__, __LINE__, | |
4185 | "moving out of jump pad single-stepping" | |
4186 | " not implemented on this target"); | |
4187 | } | |
fa593d66 PA |
4188 | } |
4189 | ||
219f2f23 PA |
4190 | /* If we have while-stepping actions in this thread set it stepping. |
4191 | If we have a signal to deliver, it may or may not be set to | |
4192 | SIG_IGN, we don't know. Assume so, and allow collecting | |
4193 | while-stepping into a signal handler. A possible smart thing to | |
4194 | do would be to set an internal breakpoint at the signal return | |
4195 | address, continue, and carry on catching this while-stepping | |
4196 | action only when that breakpoint is hit. A future | |
4197 | enhancement. */ | |
7fe5e27e | 4198 | if (thread->while_stepping != NULL) |
219f2f23 PA |
4199 | { |
4200 | if (debug_threads) | |
87ce2a04 | 4201 | debug_printf ("lwp %ld has a while-stepping action -> forcing step.\n", |
d86d4aaf | 4202 | lwpid_of (thread)); |
7fe5e27e AT |
4203 | |
4204 | step = single_step (lwp); | |
219f2f23 PA |
4205 | } |
4206 | ||
bf9ae9d8 | 4207 | if (proc->tdesc != NULL && low_supports_breakpoints ()) |
0d62e5e8 | 4208 | { |
0bfdf32f | 4209 | struct regcache *regcache = get_thread_regcache (current_thread, 1); |
582511be | 4210 | |
bf9ae9d8 | 4211 | lwp->stop_pc = low_get_pc (regcache); |
582511be PA |
4212 | |
4213 | if (debug_threads) | |
4214 | { | |
4215 | debug_printf (" %s from pc 0x%lx\n", step ? "step" : "continue", | |
4216 | (long) lwp->stop_pc); | |
4217 | } | |
0d62e5e8 DJ |
4218 | } |
4219 | ||
35ac8b3e YQ |
4220 | /* If we have pending signals, consume one if it can be delivered to |
4221 | the inferior. */ | |
013e3554 | 4222 | if (!lwp->pending_signals.empty () && lwp_signal_can_be_delivered (lwp)) |
0d62e5e8 | 4223 | { |
013e3554 | 4224 | const pending_signal &p_sig = lwp->pending_signals.front (); |
0d62e5e8 | 4225 | |
013e3554 TBA |
4226 | signal = p_sig.signal; |
4227 | if (p_sig.info.si_signo != 0) | |
d86d4aaf | 4228 | ptrace (PTRACE_SETSIGINFO, lwpid_of (thread), (PTRACE_TYPE_ARG3) 0, |
013e3554 | 4229 | &p_sig.info); |
32ca6d61 | 4230 | |
013e3554 | 4231 | lwp->pending_signals.pop_front (); |
0d62e5e8 DJ |
4232 | } |
4233 | ||
94610ec4 YQ |
4234 | if (debug_threads) |
4235 | debug_printf ("Resuming lwp %ld (%s, signal %d, stop %s)\n", | |
4236 | lwpid_of (thread), step ? "step" : "continue", signal, | |
4237 | lwp->stop_expected ? "expected" : "not expected"); | |
4238 | ||
d7599cc0 | 4239 | low_prepare_to_resume (lwp); |
aa5ca48f | 4240 | |
d86d4aaf | 4241 | regcache_invalidate_thread (thread); |
da6d8c04 | 4242 | errno = 0; |
54a0b537 | 4243 | lwp->stepping = step; |
82075af2 JS |
4244 | if (step) |
4245 | ptrace_request = PTRACE_SINGLESTEP; | |
4246 | else if (gdb_catching_syscalls_p (lwp)) | |
4247 | ptrace_request = PTRACE_SYSCALL; | |
4248 | else | |
4249 | ptrace_request = PTRACE_CONT; | |
4250 | ptrace (ptrace_request, | |
4251 | lwpid_of (thread), | |
b8e1b30e | 4252 | (PTRACE_TYPE_ARG3) 0, |
14ce3065 DE |
4253 | /* Coerce to a uintptr_t first to avoid potential gcc warning |
4254 | of coercing an 8 byte integer to a 4 byte pointer. */ | |
b8e1b30e | 4255 | (PTRACE_TYPE_ARG4) (uintptr_t) signal); |
0d62e5e8 | 4256 | |
0bfdf32f | 4257 | current_thread = saved_thread; |
da6d8c04 | 4258 | if (errno) |
23f238d3 PA |
4259 | perror_with_name ("resuming thread"); |
4260 | ||
4261 | /* Successfully resumed. Clear state that no longer makes sense, | |
4262 | and mark the LWP as running. Must not do this before resuming | |
4263 | otherwise if that fails other code will be confused. E.g., we'd | |
4264 | later try to stop the LWP and hang forever waiting for a stop | |
4265 | status. Note that we must not throw after this is cleared, | |
4266 | otherwise handle_zombie_lwp_error would get confused. */ | |
4267 | lwp->stopped = 0; | |
4268 | lwp->stop_reason = TARGET_STOPPED_BY_NO_REASON; | |
4269 | } | |
4270 | ||
d7599cc0 TBA |
4271 | void |
4272 | linux_process_target::low_prepare_to_resume (lwp_info *lwp) | |
4273 | { | |
4274 | /* Nop. */ | |
4275 | } | |
4276 | ||
23f238d3 PA |
4277 | /* Called when we try to resume a stopped LWP and that errors out. If |
4278 | the LWP is no longer in ptrace-stopped state (meaning it's zombie, | |
4279 | or about to become), discard the error, clear any pending status | |
4280 | the LWP may have, and return true (we'll collect the exit status | |
4281 | soon enough). Otherwise, return false. */ | |
4282 | ||
4283 | static int | |
4284 | check_ptrace_stopped_lwp_gone (struct lwp_info *lp) | |
4285 | { | |
4286 | struct thread_info *thread = get_lwp_thread (lp); | |
4287 | ||
4288 | /* If we get an error after resuming the LWP successfully, we'd | |
4289 | confuse !T state for the LWP being gone. */ | |
4290 | gdb_assert (lp->stopped); | |
4291 | ||
4292 | /* We can't just check whether the LWP is in 'Z (Zombie)' state, | |
4293 | because even if ptrace failed with ESRCH, the tracee may be "not | |
4294 | yet fully dead", but already refusing ptrace requests. In that | |
4295 | case the tracee has 'R (Running)' state for a little bit | |
4296 | (observed in Linux 3.18). See also the note on ESRCH in the | |
4297 | ptrace(2) man page. Instead, check whether the LWP has any state | |
4298 | other than ptrace-stopped. */ | |
4299 | ||
4300 | /* Don't assume anything if /proc/PID/status can't be read. */ | |
4301 | if (linux_proc_pid_is_trace_stopped_nowarn (lwpid_of (thread)) == 0) | |
3221518c | 4302 | { |
23f238d3 PA |
4303 | lp->stop_reason = TARGET_STOPPED_BY_NO_REASON; |
4304 | lp->status_pending_p = 0; | |
4305 | return 1; | |
4306 | } | |
4307 | return 0; | |
4308 | } | |
4309 | ||
df95181f TBA |
4310 | void |
4311 | linux_process_target::resume_one_lwp (lwp_info *lwp, int step, int signal, | |
4312 | siginfo_t *info) | |
23f238d3 | 4313 | { |
a70b8144 | 4314 | try |
23f238d3 | 4315 | { |
df95181f | 4316 | resume_one_lwp_throw (lwp, step, signal, info); |
23f238d3 | 4317 | } |
230d2906 | 4318 | catch (const gdb_exception_error &ex) |
23f238d3 PA |
4319 | { |
4320 | if (!check_ptrace_stopped_lwp_gone (lwp)) | |
eedc3f4f | 4321 | throw; |
3221518c | 4322 | } |
da6d8c04 DJ |
4323 | } |
4324 | ||
5fdda392 SM |
4325 | /* This function is called once per thread via for_each_thread. |
4326 | We look up which resume request applies to THREAD and mark it with a | |
4327 | pointer to the appropriate resume request. | |
5544ad89 DJ |
4328 | |
4329 | This algorithm is O(threads * resume elements), but resume elements | |
4330 | is small (and will remain small at least until GDB supports thread | |
4331 | suspension). */ | |
ebcf782c | 4332 | |
5fdda392 SM |
4333 | static void |
4334 | linux_set_resume_request (thread_info *thread, thread_resume *resume, size_t n) | |
0d62e5e8 | 4335 | { |
d86d4aaf | 4336 | struct lwp_info *lwp = get_thread_lwp (thread); |
64386c31 | 4337 | |
5fdda392 | 4338 | for (int ndx = 0; ndx < n; ndx++) |
95954743 | 4339 | { |
5fdda392 | 4340 | ptid_t ptid = resume[ndx].thread; |
d7e15655 | 4341 | if (ptid == minus_one_ptid |
9c80ecd6 | 4342 | || ptid == thread->id |
0c9070b3 YQ |
4343 | /* Handle both 'pPID' and 'pPID.-1' as meaning 'all threads |
4344 | of PID'. */ | |
e99b03dc | 4345 | || (ptid.pid () == pid_of (thread) |
0e998d96 | 4346 | && (ptid.is_pid () |
e38504b3 | 4347 | || ptid.lwp () == -1))) |
95954743 | 4348 | { |
5fdda392 | 4349 | if (resume[ndx].kind == resume_stop |
8336d594 | 4350 | && thread->last_resume_kind == resume_stop) |
d50171e4 PA |
4351 | { |
4352 | if (debug_threads) | |
87ce2a04 DE |
4353 | debug_printf ("already %s LWP %ld at GDB's request\n", |
4354 | (thread->last_status.kind | |
4355 | == TARGET_WAITKIND_STOPPED) | |
4356 | ? "stopped" | |
4357 | : "stopping", | |
d86d4aaf | 4358 | lwpid_of (thread)); |
d50171e4 PA |
4359 | |
4360 | continue; | |
4361 | } | |
4362 | ||
5a04c4cf PA |
4363 | /* Ignore (wildcard) resume requests for already-resumed |
4364 | threads. */ | |
5fdda392 | 4365 | if (resume[ndx].kind != resume_stop |
5a04c4cf PA |
4366 | && thread->last_resume_kind != resume_stop) |
4367 | { | |
4368 | if (debug_threads) | |
4369 | debug_printf ("already %s LWP %ld at GDB's request\n", | |
4370 | (thread->last_resume_kind | |
4371 | == resume_step) | |
4372 | ? "stepping" | |
4373 | : "continuing", | |
4374 | lwpid_of (thread)); | |
4375 | continue; | |
4376 | } | |
4377 | ||
4378 | /* Don't let wildcard resumes resume fork children that GDB | |
4379 | does not yet know are new fork children. */ | |
4380 | if (lwp->fork_relative != NULL) | |
4381 | { | |
5a04c4cf PA |
4382 | struct lwp_info *rel = lwp->fork_relative; |
4383 | ||
4384 | if (rel->status_pending_p | |
4385 | && (rel->waitstatus.kind == TARGET_WAITKIND_FORKED | |
4386 | || rel->waitstatus.kind == TARGET_WAITKIND_VFORKED)) | |
4387 | { | |
4388 | if (debug_threads) | |
4389 | debug_printf ("not resuming LWP %ld: has queued stop reply\n", | |
4390 | lwpid_of (thread)); | |
4391 | continue; | |
4392 | } | |
4393 | } | |
4394 | ||
4395 | /* If the thread has a pending event that has already been | |
4396 | reported to GDBserver core, but GDB has not pulled the | |
4397 | event out of the vStopped queue yet, likewise, ignore the | |
4398 | (wildcard) resume request. */ | |
9c80ecd6 | 4399 | if (in_queued_stop_replies (thread->id)) |
5a04c4cf PA |
4400 | { |
4401 | if (debug_threads) | |
4402 | debug_printf ("not resuming LWP %ld: has queued stop reply\n", | |
4403 | lwpid_of (thread)); | |
4404 | continue; | |
4405 | } | |
4406 | ||
5fdda392 | 4407 | lwp->resume = &resume[ndx]; |
8336d594 | 4408 | thread->last_resume_kind = lwp->resume->kind; |
fa593d66 | 4409 | |
c2d6af84 PA |
4410 | lwp->step_range_start = lwp->resume->step_range_start; |
4411 | lwp->step_range_end = lwp->resume->step_range_end; | |
4412 | ||
fa593d66 PA |
4413 | /* If we had a deferred signal to report, dequeue one now. |
4414 | This can happen if LWP gets more than one signal while | |
4415 | trying to get out of a jump pad. */ | |
4416 | if (lwp->stopped | |
4417 | && !lwp->status_pending_p | |
4418 | && dequeue_one_deferred_signal (lwp, &lwp->status_pending)) | |
4419 | { | |
4420 | lwp->status_pending_p = 1; | |
4421 | ||
4422 | if (debug_threads) | |
87ce2a04 DE |
4423 | debug_printf ("Dequeueing deferred signal %d for LWP %ld, " |
4424 | "leaving status pending.\n", | |
d86d4aaf DE |
4425 | WSTOPSIG (lwp->status_pending), |
4426 | lwpid_of (thread)); | |
fa593d66 PA |
4427 | } |
4428 | ||
5fdda392 | 4429 | return; |
95954743 PA |
4430 | } |
4431 | } | |
2bd7c093 PA |
4432 | |
4433 | /* No resume action for this thread. */ | |
4434 | lwp->resume = NULL; | |
5544ad89 DJ |
4435 | } |
4436 | ||
df95181f TBA |
4437 | bool |
4438 | linux_process_target::resume_status_pending (thread_info *thread) | |
5544ad89 | 4439 | { |
d86d4aaf | 4440 | struct lwp_info *lwp = get_thread_lwp (thread); |
5544ad89 | 4441 | |
bd99dc85 PA |
4442 | /* LWPs which will not be resumed are not interesting, because |
4443 | we might not wait for them next time through linux_wait. */ | |
2bd7c093 | 4444 | if (lwp->resume == NULL) |
25c28b4d | 4445 | return false; |
64386c31 | 4446 | |
df95181f | 4447 | return thread_still_has_status_pending (thread); |
d50171e4 PA |
4448 | } |
4449 | ||
df95181f TBA |
4450 | bool |
4451 | linux_process_target::thread_needs_step_over (thread_info *thread) | |
d50171e4 | 4452 | { |
d86d4aaf | 4453 | struct lwp_info *lwp = get_thread_lwp (thread); |
0bfdf32f | 4454 | struct thread_info *saved_thread; |
d50171e4 | 4455 | CORE_ADDR pc; |
c06cbd92 YQ |
4456 | struct process_info *proc = get_thread_process (thread); |
4457 | ||
4458 | /* GDBserver is skipping the extra traps from the wrapper program, | |
4459 | don't have to do step over. */ | |
4460 | if (proc->tdesc == NULL) | |
eca55aec | 4461 | return false; |
d50171e4 PA |
4462 | |
4463 | /* LWPs which will not be resumed are not interesting, because we | |
4464 | might not wait for them next time through linux_wait. */ | |
4465 | ||
4466 | if (!lwp->stopped) | |
4467 | { | |
4468 | if (debug_threads) | |
87ce2a04 | 4469 | debug_printf ("Need step over [LWP %ld]? Ignoring, not stopped\n", |
d86d4aaf | 4470 | lwpid_of (thread)); |
eca55aec | 4471 | return false; |
d50171e4 PA |
4472 | } |
4473 | ||
8336d594 | 4474 | if (thread->last_resume_kind == resume_stop) |
d50171e4 PA |
4475 | { |
4476 | if (debug_threads) | |
87ce2a04 DE |
4477 | debug_printf ("Need step over [LWP %ld]? Ignoring, should remain" |
4478 | " stopped\n", | |
d86d4aaf | 4479 | lwpid_of (thread)); |
eca55aec | 4480 | return false; |
d50171e4 PA |
4481 | } |
4482 | ||
7984d532 PA |
4483 | gdb_assert (lwp->suspended >= 0); |
4484 | ||
4485 | if (lwp->suspended) | |
4486 | { | |
4487 | if (debug_threads) | |
87ce2a04 | 4488 | debug_printf ("Need step over [LWP %ld]? Ignoring, suspended\n", |
d86d4aaf | 4489 | lwpid_of (thread)); |
eca55aec | 4490 | return false; |
7984d532 PA |
4491 | } |
4492 | ||
bd99dc85 | 4493 | if (lwp->status_pending_p) |
d50171e4 PA |
4494 | { |
4495 | if (debug_threads) | |
87ce2a04 DE |
4496 | debug_printf ("Need step over [LWP %ld]? Ignoring, has pending" |
4497 | " status.\n", | |
d86d4aaf | 4498 | lwpid_of (thread)); |
eca55aec | 4499 | return false; |
d50171e4 PA |
4500 | } |
4501 | ||
4502 | /* Note: PC, not STOP_PC. Either GDB has adjusted the PC already, | |
4503 | or we have. */ | |
4504 | pc = get_pc (lwp); | |
4505 | ||
4506 | /* If the PC has changed since we stopped, then don't do anything, | |
4507 | and let the breakpoint/tracepoint be hit. This happens if, for | |
4508 | instance, GDB handled the decr_pc_after_break subtraction itself, | |
4509 | GDB is OOL stepping this thread, or the user has issued a "jump" | |
4510 | command, or poked thread's registers herself. */ | |
4511 | if (pc != lwp->stop_pc) | |
4512 | { | |
4513 | if (debug_threads) | |
87ce2a04 DE |
4514 | debug_printf ("Need step over [LWP %ld]? Cancelling, PC was changed. " |
4515 | "Old stop_pc was 0x%s, PC is now 0x%s\n", | |
d86d4aaf DE |
4516 | lwpid_of (thread), |
4517 | paddress (lwp->stop_pc), paddress (pc)); | |
eca55aec | 4518 | return false; |
d50171e4 PA |
4519 | } |
4520 | ||
484b3c32 YQ |
4521 | /* On software single step target, resume the inferior with signal |
4522 | rather than stepping over. */ | |
7582c77c | 4523 | if (supports_software_single_step () |
013e3554 | 4524 | && !lwp->pending_signals.empty () |
484b3c32 YQ |
4525 | && lwp_signal_can_be_delivered (lwp)) |
4526 | { | |
4527 | if (debug_threads) | |
4528 | debug_printf ("Need step over [LWP %ld]? Ignoring, has pending" | |
4529 | " signals.\n", | |
4530 | lwpid_of (thread)); | |
4531 | ||
eca55aec | 4532 | return false; |
484b3c32 YQ |
4533 | } |
4534 | ||
0bfdf32f GB |
4535 | saved_thread = current_thread; |
4536 | current_thread = thread; | |
d50171e4 | 4537 | |
8b07ae33 | 4538 | /* We can only step over breakpoints we know about. */ |
fa593d66 | 4539 | if (breakpoint_here (pc) || fast_tracepoint_jump_here (pc)) |
d50171e4 | 4540 | { |
8b07ae33 | 4541 | /* Don't step over a breakpoint that GDB expects to hit |
9f3a5c85 LM |
4542 | though. If the condition is being evaluated on the target's side |
4543 | and it evaluate to false, step over this breakpoint as well. */ | |
4544 | if (gdb_breakpoint_here (pc) | |
d3ce09f5 SS |
4545 | && gdb_condition_true_at_breakpoint (pc) |
4546 | && gdb_no_commands_at_breakpoint (pc)) | |
8b07ae33 PA |
4547 | { |
4548 | if (debug_threads) | |
87ce2a04 DE |
4549 | debug_printf ("Need step over [LWP %ld]? yes, but found" |
4550 | " GDB breakpoint at 0x%s; skipping step over\n", | |
d86d4aaf | 4551 | lwpid_of (thread), paddress (pc)); |
d50171e4 | 4552 | |
0bfdf32f | 4553 | current_thread = saved_thread; |
eca55aec | 4554 | return false; |
8b07ae33 PA |
4555 | } |
4556 | else | |
4557 | { | |
4558 | if (debug_threads) | |
87ce2a04 DE |
4559 | debug_printf ("Need step over [LWP %ld]? yes, " |
4560 | "found breakpoint at 0x%s\n", | |
d86d4aaf | 4561 | lwpid_of (thread), paddress (pc)); |
d50171e4 | 4562 | |
8b07ae33 | 4563 | /* We've found an lwp that needs stepping over --- return 1 so |
8f86d7aa | 4564 | that find_thread stops looking. */ |
0bfdf32f | 4565 | current_thread = saved_thread; |
8b07ae33 | 4566 | |
eca55aec | 4567 | return true; |
8b07ae33 | 4568 | } |
d50171e4 PA |
4569 | } |
4570 | ||
0bfdf32f | 4571 | current_thread = saved_thread; |
d50171e4 PA |
4572 | |
4573 | if (debug_threads) | |
87ce2a04 DE |
4574 | debug_printf ("Need step over [LWP %ld]? No, no breakpoint found" |
4575 | " at 0x%s\n", | |
d86d4aaf | 4576 | lwpid_of (thread), paddress (pc)); |
c6ecbae5 | 4577 | |
eca55aec | 4578 | return false; |
5544ad89 DJ |
4579 | } |
4580 | ||
d16f3f6c TBA |
4581 | void |
4582 | linux_process_target::start_step_over (lwp_info *lwp) | |
d50171e4 | 4583 | { |
d86d4aaf | 4584 | struct thread_info *thread = get_lwp_thread (lwp); |
0bfdf32f | 4585 | struct thread_info *saved_thread; |
d50171e4 PA |
4586 | CORE_ADDR pc; |
4587 | int step; | |
4588 | ||
4589 | if (debug_threads) | |
87ce2a04 | 4590 | debug_printf ("Starting step-over on LWP %ld. Stopping all threads\n", |
d86d4aaf | 4591 | lwpid_of (thread)); |
d50171e4 | 4592 | |
7984d532 | 4593 | stop_all_lwps (1, lwp); |
863d01bd PA |
4594 | |
4595 | if (lwp->suspended != 0) | |
4596 | { | |
4597 | internal_error (__FILE__, __LINE__, | |
4598 | "LWP %ld suspended=%d\n", lwpid_of (thread), | |
4599 | lwp->suspended); | |
4600 | } | |
d50171e4 PA |
4601 | |
4602 | if (debug_threads) | |
87ce2a04 | 4603 | debug_printf ("Done stopping all threads for step-over.\n"); |
d50171e4 PA |
4604 | |
4605 | /* Note, we should always reach here with an already adjusted PC, | |
4606 | either by GDB (if we're resuming due to GDB's request), or by our | |
4607 | caller, if we just finished handling an internal breakpoint GDB | |
4608 | shouldn't care about. */ | |
4609 | pc = get_pc (lwp); | |
4610 | ||
0bfdf32f GB |
4611 | saved_thread = current_thread; |
4612 | current_thread = thread; | |
d50171e4 PA |
4613 | |
4614 | lwp->bp_reinsert = pc; | |
4615 | uninsert_breakpoints_at (pc); | |
fa593d66 | 4616 | uninsert_fast_tracepoint_jumps_at (pc); |
d50171e4 | 4617 | |
7fe5e27e | 4618 | step = single_step (lwp); |
d50171e4 | 4619 | |
0bfdf32f | 4620 | current_thread = saved_thread; |
d50171e4 | 4621 | |
df95181f | 4622 | resume_one_lwp (lwp, step, 0, NULL); |
d50171e4 PA |
4623 | |
4624 | /* Require next event from this LWP. */ | |
9c80ecd6 | 4625 | step_over_bkpt = thread->id; |
d50171e4 PA |
4626 | } |
4627 | ||
b31cdfa6 TBA |
4628 | bool |
4629 | linux_process_target::finish_step_over (lwp_info *lwp) | |
d50171e4 PA |
4630 | { |
4631 | if (lwp->bp_reinsert != 0) | |
4632 | { | |
f79b145d YQ |
4633 | struct thread_info *saved_thread = current_thread; |
4634 | ||
d50171e4 | 4635 | if (debug_threads) |
87ce2a04 | 4636 | debug_printf ("Finished step over.\n"); |
d50171e4 | 4637 | |
f79b145d YQ |
4638 | current_thread = get_lwp_thread (lwp); |
4639 | ||
d50171e4 PA |
4640 | /* Reinsert any breakpoint at LWP->BP_REINSERT. Note that there |
4641 | may be no breakpoint to reinsert there by now. */ | |
4642 | reinsert_breakpoints_at (lwp->bp_reinsert); | |
fa593d66 | 4643 | reinsert_fast_tracepoint_jumps_at (lwp->bp_reinsert); |
d50171e4 PA |
4644 | |
4645 | lwp->bp_reinsert = 0; | |
4646 | ||
3b9a79ef YQ |
4647 | /* Delete any single-step breakpoints. No longer needed. We |
4648 | don't have to worry about other threads hitting this trap, | |
4649 | and later not being able to explain it, because we were | |
4650 | stepping over a breakpoint, and we hold all threads but | |
4651 | LWP stopped while doing that. */ | |
b31cdfa6 | 4652 | if (!supports_hardware_single_step ()) |
f79b145d | 4653 | { |
3b9a79ef YQ |
4654 | gdb_assert (has_single_step_breakpoints (current_thread)); |
4655 | delete_single_step_breakpoints (current_thread); | |
f79b145d | 4656 | } |
d50171e4 PA |
4657 | |
4658 | step_over_bkpt = null_ptid; | |
f79b145d | 4659 | current_thread = saved_thread; |
b31cdfa6 | 4660 | return true; |
d50171e4 PA |
4661 | } |
4662 | else | |
b31cdfa6 | 4663 | return false; |
d50171e4 PA |
4664 | } |
4665 | ||
d16f3f6c TBA |
4666 | void |
4667 | linux_process_target::complete_ongoing_step_over () | |
863d01bd | 4668 | { |
d7e15655 | 4669 | if (step_over_bkpt != null_ptid) |
863d01bd PA |
4670 | { |
4671 | struct lwp_info *lwp; | |
4672 | int wstat; | |
4673 | int ret; | |
4674 | ||
4675 | if (debug_threads) | |
4676 | debug_printf ("detach: step over in progress, finish it first\n"); | |
4677 | ||
4678 | /* Passing NULL_PTID as filter indicates we want all events to | |
4679 | be left pending. Eventually this returns when there are no | |
4680 | unwaited-for children left. */ | |
d16f3f6c TBA |
4681 | ret = wait_for_event_filtered (minus_one_ptid, null_ptid, &wstat, |
4682 | __WALL); | |
863d01bd PA |
4683 | gdb_assert (ret == -1); |
4684 | ||
4685 | lwp = find_lwp_pid (step_over_bkpt); | |
4686 | if (lwp != NULL) | |
7e9cf1fe PA |
4687 | { |
4688 | finish_step_over (lwp); | |
4689 | ||
4690 | /* If we got our step SIGTRAP, don't leave it pending, | |
4691 | otherwise we would report it to GDB as a spurious | |
4692 | SIGTRAP. */ | |
4693 | gdb_assert (lwp->status_pending_p); | |
4694 | if (WIFSTOPPED (lwp->status_pending) | |
4695 | && WSTOPSIG (lwp->status_pending) == SIGTRAP) | |
4696 | { | |
4697 | thread_info *thread = get_lwp_thread (lwp); | |
4698 | if (thread->last_resume_kind != resume_step) | |
4699 | { | |
4700 | if (debug_threads) | |
4701 | debug_printf ("detach: discard step-over SIGTRAP\n"); | |
4702 | ||
4703 | lwp->status_pending_p = 0; | |
4704 | lwp->status_pending = 0; | |
4705 | resume_one_lwp (lwp, lwp->stepping, 0, NULL); | |
4706 | } | |
4707 | else | |
4708 | { | |
4709 | if (debug_threads) | |
4710 | debug_printf ("detach: resume_step, " | |
4711 | "not discarding step-over SIGTRAP\n"); | |
4712 | } | |
4713 | } | |
4714 | } | |
863d01bd PA |
4715 | step_over_bkpt = null_ptid; |
4716 | unsuspend_all_lwps (lwp); | |
4717 | } | |
4718 | } | |
4719 | ||
df95181f TBA |
4720 | void |
4721 | linux_process_target::resume_one_thread (thread_info *thread, | |
4722 | bool leave_all_stopped) | |
5544ad89 | 4723 | { |
d86d4aaf | 4724 | struct lwp_info *lwp = get_thread_lwp (thread); |
d50171e4 | 4725 | int leave_pending; |
5544ad89 | 4726 | |
2bd7c093 | 4727 | if (lwp->resume == NULL) |
c80825ff | 4728 | return; |
5544ad89 | 4729 | |
bd99dc85 | 4730 | if (lwp->resume->kind == resume_stop) |
5544ad89 | 4731 | { |
bd99dc85 | 4732 | if (debug_threads) |
d86d4aaf | 4733 | debug_printf ("resume_stop request for LWP %ld\n", lwpid_of (thread)); |
bd99dc85 PA |
4734 | |
4735 | if (!lwp->stopped) | |
4736 | { | |
4737 | if (debug_threads) | |
d86d4aaf | 4738 | debug_printf ("stopping LWP %ld\n", lwpid_of (thread)); |
bd99dc85 | 4739 | |
d50171e4 PA |
4740 | /* Stop the thread, and wait for the event asynchronously, |
4741 | through the event loop. */ | |
02fc4de7 | 4742 | send_sigstop (lwp); |
bd99dc85 PA |
4743 | } |
4744 | else | |
4745 | { | |
4746 | if (debug_threads) | |
87ce2a04 | 4747 | debug_printf ("already stopped LWP %ld\n", |
d86d4aaf | 4748 | lwpid_of (thread)); |
d50171e4 PA |
4749 | |
4750 | /* The LWP may have been stopped in an internal event that | |
4751 | was not meant to be notified back to GDB (e.g., gdbserver | |
4752 | breakpoint), so we should be reporting a stop event in | |
4753 | this case too. */ | |
4754 | ||
4755 | /* If the thread already has a pending SIGSTOP, this is a | |
4756 | no-op. Otherwise, something later will presumably resume | |
4757 | the thread and this will cause it to cancel any pending | |
4758 | operation, due to last_resume_kind == resume_stop. If | |
4759 | the thread already has a pending status to report, we | |
4760 | will still report it the next time we wait - see | |
4761 | status_pending_p_callback. */ | |
1a981360 PA |
4762 | |
4763 | /* If we already have a pending signal to report, then | |
4764 | there's no need to queue a SIGSTOP, as this means we're | |
4765 | midway through moving the LWP out of the jumppad, and we | |
4766 | will report the pending signal as soon as that is | |
4767 | finished. */ | |
013e3554 | 4768 | if (lwp->pending_signals_to_report.empty ()) |
1a981360 | 4769 | send_sigstop (lwp); |
bd99dc85 | 4770 | } |
32ca6d61 | 4771 | |
bd99dc85 PA |
4772 | /* For stop requests, we're done. */ |
4773 | lwp->resume = NULL; | |
fc7238bb | 4774 | thread->last_status.kind = TARGET_WAITKIND_IGNORE; |
c80825ff | 4775 | return; |
5544ad89 DJ |
4776 | } |
4777 | ||
bd99dc85 | 4778 | /* If this thread which is about to be resumed has a pending status, |
863d01bd PA |
4779 | then don't resume it - we can just report the pending status. |
4780 | Likewise if it is suspended, because e.g., another thread is | |
4781 | stepping past a breakpoint. Make sure to queue any signals that | |
4782 | would otherwise be sent. In all-stop mode, we do this decision | |
4783 | based on if *any* thread has a pending status. If there's a | |
4784 | thread that needs the step-over-breakpoint dance, then don't | |
4785 | resume any other thread but that particular one. */ | |
4786 | leave_pending = (lwp->suspended | |
4787 | || lwp->status_pending_p | |
4788 | || leave_all_stopped); | |
5544ad89 | 4789 | |
0e9a339e YQ |
4790 | /* If we have a new signal, enqueue the signal. */ |
4791 | if (lwp->resume->sig != 0) | |
4792 | { | |
4793 | siginfo_t info, *info_p; | |
4794 | ||
4795 | /* If this is the same signal we were previously stopped by, | |
4796 | make sure to queue its siginfo. */ | |
4797 | if (WIFSTOPPED (lwp->last_status) | |
4798 | && WSTOPSIG (lwp->last_status) == lwp->resume->sig | |
4799 | && ptrace (PTRACE_GETSIGINFO, lwpid_of (thread), | |
4800 | (PTRACE_TYPE_ARG3) 0, &info) == 0) | |
4801 | info_p = &info; | |
4802 | else | |
4803 | info_p = NULL; | |
4804 | ||
4805 | enqueue_pending_signal (lwp, lwp->resume->sig, info_p); | |
4806 | } | |
4807 | ||
d50171e4 | 4808 | if (!leave_pending) |
bd99dc85 PA |
4809 | { |
4810 | if (debug_threads) | |
d86d4aaf | 4811 | debug_printf ("resuming LWP %ld\n", lwpid_of (thread)); |
5544ad89 | 4812 | |
9c80ecd6 | 4813 | proceed_one_lwp (thread, NULL); |
bd99dc85 PA |
4814 | } |
4815 | else | |
4816 | { | |
4817 | if (debug_threads) | |
d86d4aaf | 4818 | debug_printf ("leaving LWP %ld stopped\n", lwpid_of (thread)); |
bd99dc85 | 4819 | } |
5544ad89 | 4820 | |
fc7238bb | 4821 | thread->last_status.kind = TARGET_WAITKIND_IGNORE; |
bd99dc85 | 4822 | lwp->resume = NULL; |
0d62e5e8 DJ |
4823 | } |
4824 | ||
0e4d7e35 TBA |
4825 | void |
4826 | linux_process_target::resume (thread_resume *resume_info, size_t n) | |
0d62e5e8 | 4827 | { |
d86d4aaf | 4828 | struct thread_info *need_step_over = NULL; |
c6ecbae5 | 4829 | |
87ce2a04 DE |
4830 | if (debug_threads) |
4831 | { | |
4832 | debug_enter (); | |
4833 | debug_printf ("linux_resume:\n"); | |
4834 | } | |
4835 | ||
5fdda392 SM |
4836 | for_each_thread ([&] (thread_info *thread) |
4837 | { | |
4838 | linux_set_resume_request (thread, resume_info, n); | |
4839 | }); | |
5544ad89 | 4840 | |
d50171e4 PA |
4841 | /* If there is a thread which would otherwise be resumed, which has |
4842 | a pending status, then don't resume any threads - we can just | |
4843 | report the pending status. Make sure to queue any signals that | |
4844 | would otherwise be sent. In non-stop mode, we'll apply this | |
4845 | logic to each thread individually. We consume all pending events | |
4846 | before considering to start a step-over (in all-stop). */ | |
25c28b4d | 4847 | bool any_pending = false; |
bd99dc85 | 4848 | if (!non_stop) |
df95181f TBA |
4849 | any_pending = find_thread ([this] (thread_info *thread) |
4850 | { | |
4851 | return resume_status_pending (thread); | |
4852 | }) != nullptr; | |
d50171e4 PA |
4853 | |
4854 | /* If there is a thread which would otherwise be resumed, which is | |
4855 | stopped at a breakpoint that needs stepping over, then don't | |
4856 | resume any threads - have it step over the breakpoint with all | |
4857 | other threads stopped, then resume all threads again. Make sure | |
4858 | to queue any signals that would otherwise be delivered or | |
4859 | queued. */ | |
bf9ae9d8 | 4860 | if (!any_pending && low_supports_breakpoints ()) |
df95181f TBA |
4861 | need_step_over = find_thread ([this] (thread_info *thread) |
4862 | { | |
4863 | return thread_needs_step_over (thread); | |
4864 | }); | |
d50171e4 | 4865 | |
c80825ff | 4866 | bool leave_all_stopped = (need_step_over != NULL || any_pending); |
d50171e4 PA |
4867 | |
4868 | if (debug_threads) | |
4869 | { | |
4870 | if (need_step_over != NULL) | |
87ce2a04 | 4871 | debug_printf ("Not resuming all, need step over\n"); |
d50171e4 | 4872 | else if (any_pending) |
87ce2a04 DE |
4873 | debug_printf ("Not resuming, all-stop and found " |
4874 | "an LWP with pending status\n"); | |
d50171e4 | 4875 | else |
87ce2a04 | 4876 | debug_printf ("Resuming, no pending status or step over needed\n"); |
d50171e4 PA |
4877 | } |
4878 | ||
4879 | /* Even if we're leaving threads stopped, queue all signals we'd | |
4880 | otherwise deliver. */ | |
c80825ff SM |
4881 | for_each_thread ([&] (thread_info *thread) |
4882 | { | |
df95181f | 4883 | resume_one_thread (thread, leave_all_stopped); |
c80825ff | 4884 | }); |
d50171e4 PA |
4885 | |
4886 | if (need_step_over) | |
d86d4aaf | 4887 | start_step_over (get_thread_lwp (need_step_over)); |
87ce2a04 DE |
4888 | |
4889 | if (debug_threads) | |
4890 | { | |
4891 | debug_printf ("linux_resume done\n"); | |
4892 | debug_exit (); | |
4893 | } | |
1bebeeca PA |
4894 | |
4895 | /* We may have events that were pending that can/should be sent to | |
4896 | the client now. Trigger a linux_wait call. */ | |
4897 | if (target_is_async_p ()) | |
4898 | async_file_mark (); | |
d50171e4 PA |
4899 | } |
4900 | ||
df95181f TBA |
4901 | void |
4902 | linux_process_target::proceed_one_lwp (thread_info *thread, lwp_info *except) | |
d50171e4 | 4903 | { |
d86d4aaf | 4904 | struct lwp_info *lwp = get_thread_lwp (thread); |
d50171e4 PA |
4905 | int step; |
4906 | ||
7984d532 | 4907 | if (lwp == except) |
e2b44075 | 4908 | return; |
d50171e4 PA |
4909 | |
4910 | if (debug_threads) | |
d86d4aaf | 4911 | debug_printf ("proceed_one_lwp: lwp %ld\n", lwpid_of (thread)); |
d50171e4 PA |
4912 | |
4913 | if (!lwp->stopped) | |
4914 | { | |
4915 | if (debug_threads) | |
d86d4aaf | 4916 | debug_printf (" LWP %ld already running\n", lwpid_of (thread)); |
e2b44075 | 4917 | return; |
d50171e4 PA |
4918 | } |
4919 | ||
02fc4de7 PA |
4920 | if (thread->last_resume_kind == resume_stop |
4921 | && thread->last_status.kind != TARGET_WAITKIND_IGNORE) | |
d50171e4 PA |
4922 | { |
4923 | if (debug_threads) | |
87ce2a04 | 4924 | debug_printf (" client wants LWP to remain %ld stopped\n", |
d86d4aaf | 4925 | lwpid_of (thread)); |
e2b44075 | 4926 | return; |
d50171e4 PA |
4927 | } |
4928 | ||
4929 | if (lwp->status_pending_p) | |
4930 | { | |
4931 | if (debug_threads) | |
87ce2a04 | 4932 | debug_printf (" LWP %ld has pending status, leaving stopped\n", |
d86d4aaf | 4933 | lwpid_of (thread)); |
e2b44075 | 4934 | return; |
d50171e4 PA |
4935 | } |
4936 | ||
7984d532 PA |
4937 | gdb_assert (lwp->suspended >= 0); |
4938 | ||
d50171e4 PA |
4939 | if (lwp->suspended) |
4940 | { | |
4941 | if (debug_threads) | |
d86d4aaf | 4942 | debug_printf (" LWP %ld is suspended\n", lwpid_of (thread)); |
e2b44075 | 4943 | return; |
d50171e4 PA |
4944 | } |
4945 | ||
1a981360 | 4946 | if (thread->last_resume_kind == resume_stop |
013e3554 | 4947 | && lwp->pending_signals_to_report.empty () |
229d26fc SM |
4948 | && (lwp->collecting_fast_tracepoint |
4949 | == fast_tpoint_collect_result::not_collecting)) | |
02fc4de7 PA |
4950 | { |
4951 | /* We haven't reported this LWP as stopped yet (otherwise, the | |
4952 | last_status.kind check above would catch it, and we wouldn't | |
4953 | reach here. This LWP may have been momentarily paused by a | |
4954 | stop_all_lwps call while handling for example, another LWP's | |
4955 | step-over. In that case, the pending expected SIGSTOP signal | |
4956 | that was queued at vCont;t handling time will have already | |
4957 | been consumed by wait_for_sigstop, and so we need to requeue | |
4958 | another one here. Note that if the LWP already has a SIGSTOP | |
4959 | pending, this is a no-op. */ | |
4960 | ||
4961 | if (debug_threads) | |
87ce2a04 DE |
4962 | debug_printf ("Client wants LWP %ld to stop. " |
4963 | "Making sure it has a SIGSTOP pending\n", | |
d86d4aaf | 4964 | lwpid_of (thread)); |
02fc4de7 PA |
4965 | |
4966 | send_sigstop (lwp); | |
4967 | } | |
4968 | ||
863d01bd PA |
4969 | if (thread->last_resume_kind == resume_step) |
4970 | { | |
4971 | if (debug_threads) | |
4972 | debug_printf (" stepping LWP %ld, client wants it stepping\n", | |
4973 | lwpid_of (thread)); | |
8901d193 | 4974 | |
3b9a79ef | 4975 | /* If resume_step is requested by GDB, install single-step |
8901d193 | 4976 | breakpoints when the thread is about to be actually resumed if |
3b9a79ef | 4977 | the single-step breakpoints weren't removed. */ |
7582c77c | 4978 | if (supports_software_single_step () |
3b9a79ef | 4979 | && !has_single_step_breakpoints (thread)) |
8901d193 YQ |
4980 | install_software_single_step_breakpoints (lwp); |
4981 | ||
4982 | step = maybe_hw_step (thread); | |
863d01bd PA |
4983 | } |
4984 | else if (lwp->bp_reinsert != 0) | |
4985 | { | |
4986 | if (debug_threads) | |
4987 | debug_printf (" stepping LWP %ld, reinsert set\n", | |
4988 | lwpid_of (thread)); | |
f79b145d YQ |
4989 | |
4990 | step = maybe_hw_step (thread); | |
863d01bd PA |
4991 | } |
4992 | else | |
4993 | step = 0; | |
4994 | ||
df95181f | 4995 | resume_one_lwp (lwp, step, 0, NULL); |
7984d532 PA |
4996 | } |
4997 | ||
df95181f TBA |
4998 | void |
4999 | linux_process_target::unsuspend_and_proceed_one_lwp (thread_info *thread, | |
5000 | lwp_info *except) | |
7984d532 | 5001 | { |
d86d4aaf | 5002 | struct lwp_info *lwp = get_thread_lwp (thread); |
7984d532 PA |
5003 | |
5004 | if (lwp == except) | |
e2b44075 | 5005 | return; |
7984d532 | 5006 | |
863d01bd | 5007 | lwp_suspended_decr (lwp); |
7984d532 | 5008 | |
e2b44075 | 5009 | proceed_one_lwp (thread, except); |
d50171e4 PA |
5010 | } |
5011 | ||
d16f3f6c TBA |
5012 | void |
5013 | linux_process_target::proceed_all_lwps () | |
d50171e4 | 5014 | { |
d86d4aaf | 5015 | struct thread_info *need_step_over; |
d50171e4 PA |
5016 | |
5017 | /* If there is a thread which would otherwise be resumed, which is | |
5018 | stopped at a breakpoint that needs stepping over, then don't | |
5019 | resume any threads - have it step over the breakpoint with all | |
5020 | other threads stopped, then resume all threads again. */ | |
5021 | ||
bf9ae9d8 | 5022 | if (low_supports_breakpoints ()) |
d50171e4 | 5023 | { |
df95181f TBA |
5024 | need_step_over = find_thread ([this] (thread_info *thread) |
5025 | { | |
5026 | return thread_needs_step_over (thread); | |
5027 | }); | |
d50171e4 PA |
5028 | |
5029 | if (need_step_over != NULL) | |
5030 | { | |
5031 | if (debug_threads) | |
87ce2a04 DE |
5032 | debug_printf ("proceed_all_lwps: found " |
5033 | "thread %ld needing a step-over\n", | |
5034 | lwpid_of (need_step_over)); | |
d50171e4 | 5035 | |
d86d4aaf | 5036 | start_step_over (get_thread_lwp (need_step_over)); |
d50171e4 PA |
5037 | return; |
5038 | } | |
5039 | } | |
5544ad89 | 5040 | |
d50171e4 | 5041 | if (debug_threads) |
87ce2a04 | 5042 | debug_printf ("Proceeding, no step-over needed\n"); |
d50171e4 | 5043 | |
df95181f | 5044 | for_each_thread ([this] (thread_info *thread) |
e2b44075 SM |
5045 | { |
5046 | proceed_one_lwp (thread, NULL); | |
5047 | }); | |
d50171e4 PA |
5048 | } |
5049 | ||
d16f3f6c TBA |
5050 | void |
5051 | linux_process_target::unstop_all_lwps (int unsuspend, lwp_info *except) | |
d50171e4 | 5052 | { |
5544ad89 DJ |
5053 | if (debug_threads) |
5054 | { | |
87ce2a04 | 5055 | debug_enter (); |
d50171e4 | 5056 | if (except) |
87ce2a04 | 5057 | debug_printf ("unstopping all lwps, except=(LWP %ld)\n", |
d86d4aaf | 5058 | lwpid_of (get_lwp_thread (except))); |
5544ad89 | 5059 | else |
87ce2a04 | 5060 | debug_printf ("unstopping all lwps\n"); |
5544ad89 DJ |
5061 | } |
5062 | ||
7984d532 | 5063 | if (unsuspend) |
e2b44075 SM |
5064 | for_each_thread ([&] (thread_info *thread) |
5065 | { | |
5066 | unsuspend_and_proceed_one_lwp (thread, except); | |
5067 | }); | |
7984d532 | 5068 | else |
e2b44075 SM |
5069 | for_each_thread ([&] (thread_info *thread) |
5070 | { | |
5071 | proceed_one_lwp (thread, except); | |
5072 | }); | |
87ce2a04 DE |
5073 | |
5074 | if (debug_threads) | |
5075 | { | |
5076 | debug_printf ("unstop_all_lwps done\n"); | |
5077 | debug_exit (); | |
5078 | } | |
0d62e5e8 DJ |
5079 | } |
5080 | ||
58caa3dc DJ |
5081 | |
5082 | #ifdef HAVE_LINUX_REGSETS | |
5083 | ||
1faeff08 MR |
5084 | #define use_linux_regsets 1 |
5085 | ||
030031ee PA |
5086 | /* Returns true if REGSET has been disabled. */ |
5087 | ||
5088 | static int | |
5089 | regset_disabled (struct regsets_info *info, struct regset_info *regset) | |
5090 | { | |
5091 | return (info->disabled_regsets != NULL | |
5092 | && info->disabled_regsets[regset - info->regsets]); | |
5093 | } | |
5094 | ||
5095 | /* Disable REGSET. */ | |
5096 | ||
5097 | static void | |
5098 | disable_regset (struct regsets_info *info, struct regset_info *regset) | |
5099 | { | |
5100 | int dr_offset; | |
5101 | ||
5102 | dr_offset = regset - info->regsets; | |
5103 | if (info->disabled_regsets == NULL) | |
224c3ddb | 5104 | info->disabled_regsets = (char *) xcalloc (1, info->num_regsets); |
030031ee PA |
5105 | info->disabled_regsets[dr_offset] = 1; |
5106 | } | |
5107 | ||
58caa3dc | 5108 | static int |
3aee8918 PA |
5109 | regsets_fetch_inferior_registers (struct regsets_info *regsets_info, |
5110 | struct regcache *regcache) | |
58caa3dc DJ |
5111 | { |
5112 | struct regset_info *regset; | |
e9d25b98 | 5113 | int saw_general_regs = 0; |
95954743 | 5114 | int pid; |
1570b33e | 5115 | struct iovec iov; |
58caa3dc | 5116 | |
0bfdf32f | 5117 | pid = lwpid_of (current_thread); |
28eef672 | 5118 | for (regset = regsets_info->regsets; regset->size >= 0; regset++) |
58caa3dc | 5119 | { |
1570b33e L |
5120 | void *buf, *data; |
5121 | int nt_type, res; | |
58caa3dc | 5122 | |
030031ee | 5123 | if (regset->size == 0 || regset_disabled (regsets_info, regset)) |
28eef672 | 5124 | continue; |
58caa3dc | 5125 | |
bca929d3 | 5126 | buf = xmalloc (regset->size); |
1570b33e L |
5127 | |
5128 | nt_type = regset->nt_type; | |
5129 | if (nt_type) | |
5130 | { | |
5131 | iov.iov_base = buf; | |
5132 | iov.iov_len = regset->size; | |
5133 | data = (void *) &iov; | |
5134 | } | |
5135 | else | |
5136 | data = buf; | |
5137 | ||
dfb64f85 | 5138 | #ifndef __sparc__ |
f15f9948 | 5139 | res = ptrace (regset->get_request, pid, |
b8e1b30e | 5140 | (PTRACE_TYPE_ARG3) (long) nt_type, data); |
dfb64f85 | 5141 | #else |
1570b33e | 5142 | res = ptrace (regset->get_request, pid, data, nt_type); |
dfb64f85 | 5143 | #endif |
58caa3dc DJ |
5144 | if (res < 0) |
5145 | { | |
1ef53e6b AH |
5146 | if (errno == EIO |
5147 | || (errno == EINVAL && regset->type == OPTIONAL_REGS)) | |
58caa3dc | 5148 | { |
1ef53e6b AH |
5149 | /* If we get EIO on a regset, or an EINVAL and the regset is |
5150 | optional, do not try it again for this process mode. */ | |
030031ee | 5151 | disable_regset (regsets_info, regset); |
58caa3dc | 5152 | } |
e5a9158d AA |
5153 | else if (errno == ENODATA) |
5154 | { | |
5155 | /* ENODATA may be returned if the regset is currently | |
5156 | not "active". This can happen in normal operation, | |
5157 | so suppress the warning in this case. */ | |
5158 | } | |
fcd4a73d YQ |
5159 | else if (errno == ESRCH) |
5160 | { | |
5161 | /* At this point, ESRCH should mean the process is | |
5162 | already gone, in which case we simply ignore attempts | |
5163 | to read its registers. */ | |
5164 | } | |
58caa3dc DJ |
5165 | else |
5166 | { | |
0d62e5e8 | 5167 | char s[256]; |
95954743 PA |
5168 | sprintf (s, "ptrace(regsets_fetch_inferior_registers) PID=%d", |
5169 | pid); | |
0d62e5e8 | 5170 | perror (s); |
58caa3dc DJ |
5171 | } |
5172 | } | |
098dbe61 AA |
5173 | else |
5174 | { | |
5175 | if (regset->type == GENERAL_REGS) | |
5176 | saw_general_regs = 1; | |
5177 | regset->store_function (regcache, buf); | |
5178 | } | |
fdeb2a12 | 5179 | free (buf); |
58caa3dc | 5180 | } |
e9d25b98 DJ |
5181 | if (saw_general_regs) |
5182 | return 0; | |
5183 | else | |
5184 | return 1; | |
58caa3dc DJ |
5185 | } |
5186 | ||
5187 | static int | |
3aee8918 PA |
5188 | regsets_store_inferior_registers (struct regsets_info *regsets_info, |
5189 | struct regcache *regcache) | |
58caa3dc DJ |
5190 | { |
5191 | struct regset_info *regset; | |
e9d25b98 | 5192 | int saw_general_regs = 0; |
95954743 | 5193 | int pid; |
1570b33e | 5194 | struct iovec iov; |
58caa3dc | 5195 | |
0bfdf32f | 5196 | pid = lwpid_of (current_thread); |
28eef672 | 5197 | for (regset = regsets_info->regsets; regset->size >= 0; regset++) |
58caa3dc | 5198 | { |
1570b33e L |
5199 | void *buf, *data; |
5200 | int nt_type, res; | |
58caa3dc | 5201 | |
feea5f36 AA |
5202 | if (regset->size == 0 || regset_disabled (regsets_info, regset) |
5203 | || regset->fill_function == NULL) | |
28eef672 | 5204 | continue; |
58caa3dc | 5205 | |
bca929d3 | 5206 | buf = xmalloc (regset->size); |
545587ee DJ |
5207 | |
5208 | /* First fill the buffer with the current register set contents, | |
5209 | in case there are any items in the kernel's regset that are | |
5210 | not in gdbserver's regcache. */ | |
1570b33e L |
5211 | |
5212 | nt_type = regset->nt_type; | |
5213 | if (nt_type) | |
5214 | { | |
5215 | iov.iov_base = buf; | |
5216 | iov.iov_len = regset->size; | |
5217 | data = (void *) &iov; | |
5218 | } | |
5219 | else | |
5220 | data = buf; | |
5221 | ||
dfb64f85 | 5222 | #ifndef __sparc__ |
f15f9948 | 5223 | res = ptrace (regset->get_request, pid, |
b8e1b30e | 5224 | (PTRACE_TYPE_ARG3) (long) nt_type, data); |
dfb64f85 | 5225 | #else |
689cc2ae | 5226 | res = ptrace (regset->get_request, pid, data, nt_type); |
dfb64f85 | 5227 | #endif |
545587ee DJ |
5228 | |
5229 | if (res == 0) | |
5230 | { | |
5231 | /* Then overlay our cached registers on that. */ | |
442ea881 | 5232 | regset->fill_function (regcache, buf); |
545587ee DJ |
5233 | |
5234 | /* Only now do we write the register set. */ | |
dfb64f85 | 5235 | #ifndef __sparc__ |
f15f9948 | 5236 | res = ptrace (regset->set_request, pid, |
b8e1b30e | 5237 | (PTRACE_TYPE_ARG3) (long) nt_type, data); |
dfb64f85 | 5238 | #else |
1570b33e | 5239 | res = ptrace (regset->set_request, pid, data, nt_type); |
dfb64f85 | 5240 | #endif |
545587ee DJ |
5241 | } |
5242 | ||
58caa3dc DJ |
5243 | if (res < 0) |
5244 | { | |
1ef53e6b AH |
5245 | if (errno == EIO |
5246 | || (errno == EINVAL && regset->type == OPTIONAL_REGS)) | |
58caa3dc | 5247 | { |
1ef53e6b AH |
5248 | /* If we get EIO on a regset, or an EINVAL and the regset is |
5249 | optional, do not try it again for this process mode. */ | |
030031ee | 5250 | disable_regset (regsets_info, regset); |
58caa3dc | 5251 | } |
3221518c UW |
5252 | else if (errno == ESRCH) |
5253 | { | |
1b3f6016 PA |
5254 | /* At this point, ESRCH should mean the process is |
5255 | already gone, in which case we simply ignore attempts | |
5256 | to change its registers. See also the related | |
df95181f | 5257 | comment in resume_one_lwp. */ |
fdeb2a12 | 5258 | free (buf); |
3221518c UW |
5259 | return 0; |
5260 | } | |
58caa3dc DJ |
5261 | else |
5262 | { | |
ce3a066d | 5263 | perror ("Warning: ptrace(regsets_store_inferior_registers)"); |
58caa3dc DJ |
5264 | } |
5265 | } | |
e9d25b98 DJ |
5266 | else if (regset->type == GENERAL_REGS) |
5267 | saw_general_regs = 1; | |
09ec9b38 | 5268 | free (buf); |
58caa3dc | 5269 | } |
e9d25b98 DJ |
5270 | if (saw_general_regs) |
5271 | return 0; | |
5272 | else | |
5273 | return 1; | |
58caa3dc DJ |
5274 | } |
5275 | ||
1faeff08 | 5276 | #else /* !HAVE_LINUX_REGSETS */ |
58caa3dc | 5277 | |
1faeff08 | 5278 | #define use_linux_regsets 0 |
3aee8918 PA |
5279 | #define regsets_fetch_inferior_registers(regsets_info, regcache) 1 |
5280 | #define regsets_store_inferior_registers(regsets_info, regcache) 1 | |
58caa3dc | 5281 | |
58caa3dc | 5282 | #endif |
1faeff08 MR |
5283 | |
5284 | /* Return 1 if register REGNO is supported by one of the regset ptrace | |
5285 | calls or 0 if it has to be transferred individually. */ | |
5286 | ||
5287 | static int | |
3aee8918 | 5288 | linux_register_in_regsets (const struct regs_info *regs_info, int regno) |
1faeff08 MR |
5289 | { |
5290 | unsigned char mask = 1 << (regno % 8); | |
5291 | size_t index = regno / 8; | |
5292 | ||
5293 | return (use_linux_regsets | |
3aee8918 PA |
5294 | && (regs_info->regset_bitmap == NULL |
5295 | || (regs_info->regset_bitmap[index] & mask) != 0)); | |
1faeff08 MR |
5296 | } |
5297 | ||
58caa3dc | 5298 | #ifdef HAVE_LINUX_USRREGS |
1faeff08 | 5299 | |
5b3da067 | 5300 | static int |
3aee8918 | 5301 | register_addr (const struct usrregs_info *usrregs, int regnum) |
1faeff08 MR |
5302 | { |
5303 | int addr; | |
5304 | ||
3aee8918 | 5305 | if (regnum < 0 || regnum >= usrregs->num_regs) |
1faeff08 MR |
5306 | error ("Invalid register number %d.", regnum); |
5307 | ||
3aee8918 | 5308 | addr = usrregs->regmap[regnum]; |
1faeff08 MR |
5309 | |
5310 | return addr; | |
5311 | } | |
5312 | ||
daca57a7 TBA |
5313 | |
5314 | void | |
5315 | linux_process_target::fetch_register (const usrregs_info *usrregs, | |
5316 | regcache *regcache, int regno) | |
1faeff08 MR |
5317 | { |
5318 | CORE_ADDR regaddr; | |
5319 | int i, size; | |
5320 | char *buf; | |
5321 | int pid; | |
5322 | ||
3aee8918 | 5323 | if (regno >= usrregs->num_regs) |
1faeff08 | 5324 | return; |
daca57a7 | 5325 | if (low_cannot_fetch_register (regno)) |
1faeff08 MR |
5326 | return; |
5327 | ||
3aee8918 | 5328 | regaddr = register_addr (usrregs, regno); |
1faeff08 MR |
5329 | if (regaddr == -1) |
5330 | return; | |
5331 | ||
3aee8918 PA |
5332 | size = ((register_size (regcache->tdesc, regno) |
5333 | + sizeof (PTRACE_XFER_TYPE) - 1) | |
1faeff08 | 5334 | & -sizeof (PTRACE_XFER_TYPE)); |
224c3ddb | 5335 | buf = (char *) alloca (size); |
1faeff08 | 5336 | |
0bfdf32f | 5337 | pid = lwpid_of (current_thread); |
1faeff08 MR |
5338 | for (i = 0; i < size; i += sizeof (PTRACE_XFER_TYPE)) |
5339 | { | |
5340 | errno = 0; | |
5341 | *(PTRACE_XFER_TYPE *) (buf + i) = | |
5342 | ptrace (PTRACE_PEEKUSER, pid, | |
5343 | /* Coerce to a uintptr_t first to avoid potential gcc warning | |
5344 | of coercing an 8 byte integer to a 4 byte pointer. */ | |
b8e1b30e | 5345 | (PTRACE_TYPE_ARG3) (uintptr_t) regaddr, (PTRACE_TYPE_ARG4) 0); |
1faeff08 MR |
5346 | regaddr += sizeof (PTRACE_XFER_TYPE); |
5347 | if (errno != 0) | |
9a70f35c YQ |
5348 | { |
5349 | /* Mark register REGNO unavailable. */ | |
5350 | supply_register (regcache, regno, NULL); | |
5351 | return; | |
5352 | } | |
1faeff08 MR |
5353 | } |
5354 | ||
b35db733 | 5355 | low_supply_ptrace_register (regcache, regno, buf); |
1faeff08 MR |
5356 | } |
5357 | ||
daca57a7 TBA |
5358 | void |
5359 | linux_process_target::store_register (const usrregs_info *usrregs, | |
5360 | regcache *regcache, int regno) | |
1faeff08 MR |
5361 | { |
5362 | CORE_ADDR regaddr; | |
5363 | int i, size; | |
5364 | char *buf; | |
5365 | int pid; | |
5366 | ||
3aee8918 | 5367 | if (regno >= usrregs->num_regs) |
1faeff08 | 5368 | return; |
daca57a7 | 5369 | if (low_cannot_store_register (regno)) |
1faeff08 MR |
5370 | return; |
5371 | ||
3aee8918 | 5372 | regaddr = register_addr (usrregs, regno); |
1faeff08 MR |
5373 | if (regaddr == -1) |
5374 | return; | |
5375 | ||
3aee8918 PA |
5376 | size = ((register_size (regcache->tdesc, regno) |
5377 | + sizeof (PTRACE_XFER_TYPE) - 1) | |
1faeff08 | 5378 | & -sizeof (PTRACE_XFER_TYPE)); |
224c3ddb | 5379 | buf = (char *) alloca (size); |
1faeff08 MR |
5380 | memset (buf, 0, size); |
5381 | ||
b35db733 | 5382 | low_collect_ptrace_register (regcache, regno, buf); |
1faeff08 | 5383 | |
0bfdf32f | 5384 | pid = lwpid_of (current_thread); |
1faeff08 MR |
5385 | for (i = 0; i < size; i += sizeof (PTRACE_XFER_TYPE)) |
5386 | { | |
5387 | errno = 0; | |
5388 | ptrace (PTRACE_POKEUSER, pid, | |
5389 | /* Coerce to a uintptr_t first to avoid potential gcc warning | |
5390 | about coercing an 8 byte integer to a 4 byte pointer. */ | |
b8e1b30e LM |
5391 | (PTRACE_TYPE_ARG3) (uintptr_t) regaddr, |
5392 | (PTRACE_TYPE_ARG4) *(PTRACE_XFER_TYPE *) (buf + i)); | |
1faeff08 MR |
5393 | if (errno != 0) |
5394 | { | |
5395 | /* At this point, ESRCH should mean the process is | |
5396 | already gone, in which case we simply ignore attempts | |
5397 | to change its registers. See also the related | |
df95181f | 5398 | comment in resume_one_lwp. */ |
1faeff08 MR |
5399 | if (errno == ESRCH) |
5400 | return; | |
5401 | ||
daca57a7 TBA |
5402 | |
5403 | if (!low_cannot_store_register (regno)) | |
6d91ce9a | 5404 | error ("writing register %d: %s", regno, safe_strerror (errno)); |
1faeff08 MR |
5405 | } |
5406 | regaddr += sizeof (PTRACE_XFER_TYPE); | |
5407 | } | |
5408 | } | |
daca57a7 | 5409 | #endif /* HAVE_LINUX_USRREGS */ |
1faeff08 | 5410 | |
b35db733 TBA |
5411 | void |
5412 | linux_process_target::low_collect_ptrace_register (regcache *regcache, | |
5413 | int regno, char *buf) | |
5414 | { | |
5415 | collect_register (regcache, regno, buf); | |
5416 | } | |
5417 | ||
5418 | void | |
5419 | linux_process_target::low_supply_ptrace_register (regcache *regcache, | |
5420 | int regno, const char *buf) | |
5421 | { | |
5422 | supply_register (regcache, regno, buf); | |
5423 | } | |
5424 | ||
daca57a7 TBA |
5425 | void |
5426 | linux_process_target::usr_fetch_inferior_registers (const regs_info *regs_info, | |
5427 | regcache *regcache, | |
5428 | int regno, int all) | |
1faeff08 | 5429 | { |
daca57a7 | 5430 | #ifdef HAVE_LINUX_USRREGS |
3aee8918 PA |
5431 | struct usrregs_info *usr = regs_info->usrregs; |
5432 | ||
1faeff08 MR |
5433 | if (regno == -1) |
5434 | { | |
3aee8918 PA |
5435 | for (regno = 0; regno < usr->num_regs; regno++) |
5436 | if (all || !linux_register_in_regsets (regs_info, regno)) | |
5437 | fetch_register (usr, regcache, regno); | |
1faeff08 MR |
5438 | } |
5439 | else | |
3aee8918 | 5440 | fetch_register (usr, regcache, regno); |
daca57a7 | 5441 | #endif |
1faeff08 MR |
5442 | } |
5443 | ||
daca57a7 TBA |
5444 | void |
5445 | linux_process_target::usr_store_inferior_registers (const regs_info *regs_info, | |
5446 | regcache *regcache, | |
5447 | int regno, int all) | |
1faeff08 | 5448 | { |
daca57a7 | 5449 | #ifdef HAVE_LINUX_USRREGS |
3aee8918 PA |
5450 | struct usrregs_info *usr = regs_info->usrregs; |
5451 | ||
1faeff08 MR |
5452 | if (regno == -1) |
5453 | { | |
3aee8918 PA |
5454 | for (regno = 0; regno < usr->num_regs; regno++) |
5455 | if (all || !linux_register_in_regsets (regs_info, regno)) | |
5456 | store_register (usr, regcache, regno); | |
1faeff08 MR |
5457 | } |
5458 | else | |
3aee8918 | 5459 | store_register (usr, regcache, regno); |
58caa3dc | 5460 | #endif |
daca57a7 | 5461 | } |
1faeff08 | 5462 | |
a5a4d4cd TBA |
5463 | void |
5464 | linux_process_target::fetch_registers (regcache *regcache, int regno) | |
1faeff08 MR |
5465 | { |
5466 | int use_regsets; | |
5467 | int all = 0; | |
aa8d21c9 | 5468 | const regs_info *regs_info = get_regs_info (); |
1faeff08 MR |
5469 | |
5470 | if (regno == -1) | |
5471 | { | |
bd70b1f2 | 5472 | if (regs_info->usrregs != NULL) |
3aee8918 | 5473 | for (regno = 0; regno < regs_info->usrregs->num_regs; regno++) |
bd70b1f2 | 5474 | low_fetch_register (regcache, regno); |
c14dfd32 | 5475 | |
3aee8918 PA |
5476 | all = regsets_fetch_inferior_registers (regs_info->regsets_info, regcache); |
5477 | if (regs_info->usrregs != NULL) | |
5478 | usr_fetch_inferior_registers (regs_info, regcache, -1, all); | |
1faeff08 MR |
5479 | } |
5480 | else | |
5481 | { | |
bd70b1f2 | 5482 | if (low_fetch_register (regcache, regno)) |
c14dfd32 PA |
5483 | return; |
5484 | ||
3aee8918 | 5485 | use_regsets = linux_register_in_regsets (regs_info, regno); |
1faeff08 | 5486 | if (use_regsets) |
3aee8918 PA |
5487 | all = regsets_fetch_inferior_registers (regs_info->regsets_info, |
5488 | regcache); | |
5489 | if ((!use_regsets || all) && regs_info->usrregs != NULL) | |
5490 | usr_fetch_inferior_registers (regs_info, regcache, regno, 1); | |
1faeff08 | 5491 | } |
58caa3dc DJ |
5492 | } |
5493 | ||
a5a4d4cd TBA |
5494 | void |
5495 | linux_process_target::store_registers (regcache *regcache, int regno) | |
58caa3dc | 5496 | { |
1faeff08 MR |
5497 | int use_regsets; |
5498 | int all = 0; | |
aa8d21c9 | 5499 | const regs_info *regs_info = get_regs_info (); |
1faeff08 MR |
5500 | |
5501 | if (regno == -1) | |
5502 | { | |
3aee8918 PA |
5503 | all = regsets_store_inferior_registers (regs_info->regsets_info, |
5504 | regcache); | |
5505 | if (regs_info->usrregs != NULL) | |
5506 | usr_store_inferior_registers (regs_info, regcache, regno, all); | |
1faeff08 MR |
5507 | } |
5508 | else | |
5509 | { | |
3aee8918 | 5510 | use_regsets = linux_register_in_regsets (regs_info, regno); |
1faeff08 | 5511 | if (use_regsets) |
3aee8918 PA |
5512 | all = regsets_store_inferior_registers (regs_info->regsets_info, |
5513 | regcache); | |
5514 | if ((!use_regsets || all) && regs_info->usrregs != NULL) | |
5515 | usr_store_inferior_registers (regs_info, regcache, regno, 1); | |
1faeff08 | 5516 | } |
58caa3dc DJ |
5517 | } |
5518 | ||
bd70b1f2 TBA |
5519 | bool |
5520 | linux_process_target::low_fetch_register (regcache *regcache, int regno) | |
5521 | { | |
5522 | return false; | |
5523 | } | |
da6d8c04 | 5524 | |
e2558df3 | 5525 | /* A wrapper for the read_memory target op. */ |
da6d8c04 | 5526 | |
c3e735a6 | 5527 | static int |
f450004a | 5528 | linux_read_memory (CORE_ADDR memaddr, unsigned char *myaddr, int len) |
e2558df3 | 5529 | { |
52405d85 | 5530 | return the_target->read_memory (memaddr, myaddr, len); |
e2558df3 TBA |
5531 | } |
5532 | ||
5533 | /* Copy LEN bytes from inferior's memory starting at MEMADDR | |
5534 | to debugger memory starting at MYADDR. */ | |
5535 | ||
5536 | int | |
5537 | linux_process_target::read_memory (CORE_ADDR memaddr, | |
5538 | unsigned char *myaddr, int len) | |
da6d8c04 | 5539 | { |
0bfdf32f | 5540 | int pid = lwpid_of (current_thread); |
ae3e2ccf SM |
5541 | PTRACE_XFER_TYPE *buffer; |
5542 | CORE_ADDR addr; | |
5543 | int count; | |
4934b29e | 5544 | char filename[64]; |
ae3e2ccf | 5545 | int i; |
4934b29e | 5546 | int ret; |
fd462a61 | 5547 | int fd; |
fd462a61 DJ |
5548 | |
5549 | /* Try using /proc. Don't bother for one word. */ | |
5550 | if (len >= 3 * sizeof (long)) | |
5551 | { | |
4934b29e MR |
5552 | int bytes; |
5553 | ||
fd462a61 DJ |
5554 | /* We could keep this file open and cache it - possibly one per |
5555 | thread. That requires some juggling, but is even faster. */ | |
95954743 | 5556 | sprintf (filename, "/proc/%d/mem", pid); |
fd462a61 DJ |
5557 | fd = open (filename, O_RDONLY | O_LARGEFILE); |
5558 | if (fd == -1) | |
5559 | goto no_proc; | |
5560 | ||
5561 | /* If pread64 is available, use it. It's faster if the kernel | |
5562 | supports it (only one syscall), and it's 64-bit safe even on | |
5563 | 32-bit platforms (for instance, SPARC debugging a SPARC64 | |
5564 | application). */ | |
5565 | #ifdef HAVE_PREAD64 | |
4934b29e | 5566 | bytes = pread64 (fd, myaddr, len, memaddr); |
fd462a61 | 5567 | #else |
4934b29e MR |
5568 | bytes = -1; |
5569 | if (lseek (fd, memaddr, SEEK_SET) != -1) | |
5570 | bytes = read (fd, myaddr, len); | |
fd462a61 | 5571 | #endif |
fd462a61 DJ |
5572 | |
5573 | close (fd); | |
4934b29e MR |
5574 | if (bytes == len) |
5575 | return 0; | |
5576 | ||
5577 | /* Some data was read, we'll try to get the rest with ptrace. */ | |
5578 | if (bytes > 0) | |
5579 | { | |
5580 | memaddr += bytes; | |
5581 | myaddr += bytes; | |
5582 | len -= bytes; | |
5583 | } | |
fd462a61 | 5584 | } |
da6d8c04 | 5585 | |
fd462a61 | 5586 | no_proc: |
4934b29e MR |
5587 | /* Round starting address down to longword boundary. */ |
5588 | addr = memaddr & -(CORE_ADDR) sizeof (PTRACE_XFER_TYPE); | |
5589 | /* Round ending address up; get number of longwords that makes. */ | |
5590 | count = ((((memaddr + len) - addr) + sizeof (PTRACE_XFER_TYPE) - 1) | |
5591 | / sizeof (PTRACE_XFER_TYPE)); | |
5592 | /* Allocate buffer of that many longwords. */ | |
8d749320 | 5593 | buffer = XALLOCAVEC (PTRACE_XFER_TYPE, count); |
4934b29e | 5594 | |
da6d8c04 | 5595 | /* Read all the longwords */ |
4934b29e | 5596 | errno = 0; |
da6d8c04 DJ |
5597 | for (i = 0; i < count; i++, addr += sizeof (PTRACE_XFER_TYPE)) |
5598 | { | |
14ce3065 DE |
5599 | /* Coerce the 3rd arg to a uintptr_t first to avoid potential gcc warning |
5600 | about coercing an 8 byte integer to a 4 byte pointer. */ | |
5601 | buffer[i] = ptrace (PTRACE_PEEKTEXT, pid, | |
b8e1b30e LM |
5602 | (PTRACE_TYPE_ARG3) (uintptr_t) addr, |
5603 | (PTRACE_TYPE_ARG4) 0); | |
c3e735a6 | 5604 | if (errno) |
4934b29e | 5605 | break; |
da6d8c04 | 5606 | } |
4934b29e | 5607 | ret = errno; |
da6d8c04 DJ |
5608 | |
5609 | /* Copy appropriate bytes out of the buffer. */ | |
8d409d16 MR |
5610 | if (i > 0) |
5611 | { | |
5612 | i *= sizeof (PTRACE_XFER_TYPE); | |
5613 | i -= memaddr & (sizeof (PTRACE_XFER_TYPE) - 1); | |
5614 | memcpy (myaddr, | |
5615 | (char *) buffer + (memaddr & (sizeof (PTRACE_XFER_TYPE) - 1)), | |
5616 | i < len ? i : len); | |
5617 | } | |
c3e735a6 | 5618 | |
4934b29e | 5619 | return ret; |
da6d8c04 DJ |
5620 | } |
5621 | ||
93ae6fdc PA |
5622 | /* Copy LEN bytes of data from debugger memory at MYADDR to inferior's |
5623 | memory at MEMADDR. On failure (cannot write to the inferior) | |
f0ae6fc3 | 5624 | returns the value of errno. Always succeeds if LEN is zero. */ |
da6d8c04 | 5625 | |
e2558df3 TBA |
5626 | int |
5627 | linux_process_target::write_memory (CORE_ADDR memaddr, | |
5628 | const unsigned char *myaddr, int len) | |
da6d8c04 | 5629 | { |
ae3e2ccf | 5630 | int i; |
da6d8c04 | 5631 | /* Round starting address down to longword boundary. */ |
ae3e2ccf | 5632 | CORE_ADDR addr = memaddr & -(CORE_ADDR) sizeof (PTRACE_XFER_TYPE); |
da6d8c04 | 5633 | /* Round ending address up; get number of longwords that makes. */ |
ae3e2ccf | 5634 | int count |
493e2a69 MS |
5635 | = (((memaddr + len) - addr) + sizeof (PTRACE_XFER_TYPE) - 1) |
5636 | / sizeof (PTRACE_XFER_TYPE); | |
5637 | ||
da6d8c04 | 5638 | /* Allocate buffer of that many longwords. */ |
ae3e2ccf | 5639 | PTRACE_XFER_TYPE *buffer = XALLOCAVEC (PTRACE_XFER_TYPE, count); |
493e2a69 | 5640 | |
0bfdf32f | 5641 | int pid = lwpid_of (current_thread); |
da6d8c04 | 5642 | |
f0ae6fc3 PA |
5643 | if (len == 0) |
5644 | { | |
5645 | /* Zero length write always succeeds. */ | |
5646 | return 0; | |
5647 | } | |
5648 | ||
0d62e5e8 DJ |
5649 | if (debug_threads) |
5650 | { | |
58d6951d | 5651 | /* Dump up to four bytes. */ |
bf47e248 PA |
5652 | char str[4 * 2 + 1]; |
5653 | char *p = str; | |
5654 | int dump = len < 4 ? len : 4; | |
5655 | ||
5656 | for (i = 0; i < dump; i++) | |
5657 | { | |
5658 | sprintf (p, "%02x", myaddr[i]); | |
5659 | p += 2; | |
5660 | } | |
5661 | *p = '\0'; | |
5662 | ||
5663 | debug_printf ("Writing %s to 0x%08lx in process %d\n", | |
5664 | str, (long) memaddr, pid); | |
0d62e5e8 DJ |
5665 | } |
5666 | ||
da6d8c04 DJ |
5667 | /* Fill start and end extra bytes of buffer with existing memory data. */ |
5668 | ||
93ae6fdc | 5669 | errno = 0; |
14ce3065 DE |
5670 | /* Coerce the 3rd arg to a uintptr_t first to avoid potential gcc warning |
5671 | about coercing an 8 byte integer to a 4 byte pointer. */ | |
5672 | buffer[0] = ptrace (PTRACE_PEEKTEXT, pid, | |
b8e1b30e LM |
5673 | (PTRACE_TYPE_ARG3) (uintptr_t) addr, |
5674 | (PTRACE_TYPE_ARG4) 0); | |
93ae6fdc PA |
5675 | if (errno) |
5676 | return errno; | |
da6d8c04 DJ |
5677 | |
5678 | if (count > 1) | |
5679 | { | |
93ae6fdc | 5680 | errno = 0; |
da6d8c04 | 5681 | buffer[count - 1] |
95954743 | 5682 | = ptrace (PTRACE_PEEKTEXT, pid, |
14ce3065 DE |
5683 | /* Coerce to a uintptr_t first to avoid potential gcc warning |
5684 | about coercing an 8 byte integer to a 4 byte pointer. */ | |
b8e1b30e | 5685 | (PTRACE_TYPE_ARG3) (uintptr_t) (addr + (count - 1) |
14ce3065 | 5686 | * sizeof (PTRACE_XFER_TYPE)), |
b8e1b30e | 5687 | (PTRACE_TYPE_ARG4) 0); |
93ae6fdc PA |
5688 | if (errno) |
5689 | return errno; | |
da6d8c04 DJ |
5690 | } |
5691 | ||
93ae6fdc | 5692 | /* Copy data to be written over corresponding part of buffer. */ |
da6d8c04 | 5693 | |
493e2a69 MS |
5694 | memcpy ((char *) buffer + (memaddr & (sizeof (PTRACE_XFER_TYPE) - 1)), |
5695 | myaddr, len); | |
da6d8c04 DJ |
5696 | |
5697 | /* Write the entire buffer. */ | |
5698 | ||
5699 | for (i = 0; i < count; i++, addr += sizeof (PTRACE_XFER_TYPE)) | |
5700 | { | |
5701 | errno = 0; | |
14ce3065 DE |
5702 | ptrace (PTRACE_POKETEXT, pid, |
5703 | /* Coerce to a uintptr_t first to avoid potential gcc warning | |
5704 | about coercing an 8 byte integer to a 4 byte pointer. */ | |
b8e1b30e LM |
5705 | (PTRACE_TYPE_ARG3) (uintptr_t) addr, |
5706 | (PTRACE_TYPE_ARG4) buffer[i]); | |
da6d8c04 DJ |
5707 | if (errno) |
5708 | return errno; | |
5709 | } | |
5710 | ||
5711 | return 0; | |
5712 | } | |
2f2893d9 | 5713 | |
2a31c7aa TBA |
5714 | void |
5715 | linux_process_target::look_up_symbols () | |
2f2893d9 | 5716 | { |
0d62e5e8 | 5717 | #ifdef USE_THREAD_DB |
95954743 PA |
5718 | struct process_info *proc = current_process (); |
5719 | ||
fe978cb0 | 5720 | if (proc->priv->thread_db != NULL) |
0d62e5e8 DJ |
5721 | return; |
5722 | ||
9b4c5f87 | 5723 | thread_db_init (); |
0d62e5e8 DJ |
5724 | #endif |
5725 | } | |
5726 | ||
eb497a2a TBA |
5727 | void |
5728 | linux_process_target::request_interrupt () | |
e5379b03 | 5729 | { |
78708b7c PA |
5730 | /* Send a SIGINT to the process group. This acts just like the user |
5731 | typed a ^C on the controlling terminal. */ | |
eb497a2a | 5732 | ::kill (-signal_pid, SIGINT); |
e5379b03 DJ |
5733 | } |
5734 | ||
eac215cc TBA |
5735 | bool |
5736 | linux_process_target::supports_read_auxv () | |
5737 | { | |
5738 | return true; | |
5739 | } | |
5740 | ||
aa691b87 RM |
5741 | /* Copy LEN bytes from inferior's auxiliary vector starting at OFFSET |
5742 | to debugger memory starting at MYADDR. */ | |
5743 | ||
eac215cc TBA |
5744 | int |
5745 | linux_process_target::read_auxv (CORE_ADDR offset, unsigned char *myaddr, | |
5746 | unsigned int len) | |
aa691b87 RM |
5747 | { |
5748 | char filename[PATH_MAX]; | |
5749 | int fd, n; | |
0bfdf32f | 5750 | int pid = lwpid_of (current_thread); |
aa691b87 | 5751 | |
6cebaf6e | 5752 | xsnprintf (filename, sizeof filename, "/proc/%d/auxv", pid); |
aa691b87 RM |
5753 | |
5754 | fd = open (filename, O_RDONLY); | |
5755 | if (fd < 0) | |
5756 | return -1; | |
5757 | ||
5758 | if (offset != (CORE_ADDR) 0 | |
5759 | && lseek (fd, (off_t) offset, SEEK_SET) != (off_t) offset) | |
5760 | n = -1; | |
5761 | else | |
5762 | n = read (fd, myaddr, len); | |
5763 | ||
5764 | close (fd); | |
5765 | ||
5766 | return n; | |
5767 | } | |
5768 | ||
7e0bde70 TBA |
5769 | int |
5770 | linux_process_target::insert_point (enum raw_bkpt_type type, CORE_ADDR addr, | |
5771 | int size, raw_breakpoint *bp) | |
e013ee27 | 5772 | { |
c8f4bfdd YQ |
5773 | if (type == raw_bkpt_type_sw) |
5774 | return insert_memory_breakpoint (bp); | |
e013ee27 | 5775 | else |
9db9aa23 TBA |
5776 | return low_insert_point (type, addr, size, bp); |
5777 | } | |
5778 | ||
5779 | int | |
5780 | linux_process_target::low_insert_point (raw_bkpt_type type, CORE_ADDR addr, | |
5781 | int size, raw_breakpoint *bp) | |
5782 | { | |
5783 | /* Unsupported (see target.h). */ | |
5784 | return 1; | |
e013ee27 OF |
5785 | } |
5786 | ||
7e0bde70 TBA |
5787 | int |
5788 | linux_process_target::remove_point (enum raw_bkpt_type type, CORE_ADDR addr, | |
5789 | int size, raw_breakpoint *bp) | |
e013ee27 | 5790 | { |
c8f4bfdd YQ |
5791 | if (type == raw_bkpt_type_sw) |
5792 | return remove_memory_breakpoint (bp); | |
e013ee27 | 5793 | else |
9db9aa23 TBA |
5794 | return low_remove_point (type, addr, size, bp); |
5795 | } | |
5796 | ||
5797 | int | |
5798 | linux_process_target::low_remove_point (raw_bkpt_type type, CORE_ADDR addr, | |
5799 | int size, raw_breakpoint *bp) | |
5800 | { | |
5801 | /* Unsupported (see target.h). */ | |
5802 | return 1; | |
e013ee27 OF |
5803 | } |
5804 | ||
84320c4e | 5805 | /* Implement the stopped_by_sw_breakpoint target_ops |
3e572f71 PA |
5806 | method. */ |
5807 | ||
84320c4e TBA |
5808 | bool |
5809 | linux_process_target::stopped_by_sw_breakpoint () | |
3e572f71 PA |
5810 | { |
5811 | struct lwp_info *lwp = get_thread_lwp (current_thread); | |
5812 | ||
5813 | return (lwp->stop_reason == TARGET_STOPPED_BY_SW_BREAKPOINT); | |
5814 | } | |
5815 | ||
84320c4e | 5816 | /* Implement the supports_stopped_by_sw_breakpoint target_ops |
3e572f71 PA |
5817 | method. */ |
5818 | ||
84320c4e TBA |
5819 | bool |
5820 | linux_process_target::supports_stopped_by_sw_breakpoint () | |
3e572f71 PA |
5821 | { |
5822 | return USE_SIGTRAP_SIGINFO; | |
5823 | } | |
5824 | ||
93fe88b2 | 5825 | /* Implement the stopped_by_hw_breakpoint target_ops |
3e572f71 PA |
5826 | method. */ |
5827 | ||
93fe88b2 TBA |
5828 | bool |
5829 | linux_process_target::stopped_by_hw_breakpoint () | |
3e572f71 PA |
5830 | { |
5831 | struct lwp_info *lwp = get_thread_lwp (current_thread); | |
5832 | ||
5833 | return (lwp->stop_reason == TARGET_STOPPED_BY_HW_BREAKPOINT); | |
5834 | } | |
5835 | ||
93fe88b2 | 5836 | /* Implement the supports_stopped_by_hw_breakpoint target_ops |
3e572f71 PA |
5837 | method. */ |
5838 | ||
93fe88b2 TBA |
5839 | bool |
5840 | linux_process_target::supports_stopped_by_hw_breakpoint () | |
3e572f71 PA |
5841 | { |
5842 | return USE_SIGTRAP_SIGINFO; | |
5843 | } | |
5844 | ||
70b90b91 | 5845 | /* Implement the supports_hardware_single_step target_ops method. */ |
45614f15 | 5846 | |
22aa6223 TBA |
5847 | bool |
5848 | linux_process_target::supports_hardware_single_step () | |
45614f15 | 5849 | { |
b31cdfa6 | 5850 | return true; |
45614f15 YQ |
5851 | } |
5852 | ||
6eeb5c55 TBA |
5853 | bool |
5854 | linux_process_target::stopped_by_watchpoint () | |
e013ee27 | 5855 | { |
0bfdf32f | 5856 | struct lwp_info *lwp = get_thread_lwp (current_thread); |
c3adc08c | 5857 | |
15c66dd6 | 5858 | return lwp->stop_reason == TARGET_STOPPED_BY_WATCHPOINT; |
e013ee27 OF |
5859 | } |
5860 | ||
6eeb5c55 TBA |
5861 | CORE_ADDR |
5862 | linux_process_target::stopped_data_address () | |
e013ee27 | 5863 | { |
0bfdf32f | 5864 | struct lwp_info *lwp = get_thread_lwp (current_thread); |
c3adc08c PA |
5865 | |
5866 | return lwp->stopped_data_address; | |
e013ee27 OF |
5867 | } |
5868 | ||
db0dfaa0 LM |
5869 | /* This is only used for targets that define PT_TEXT_ADDR, |
5870 | PT_DATA_ADDR and PT_TEXT_END_ADDR. If those are not defined, supposedly | |
5871 | the target has different ways of acquiring this information, like | |
5872 | loadmaps. */ | |
52fb6437 | 5873 | |
5203ae1e TBA |
5874 | bool |
5875 | linux_process_target::supports_read_offsets () | |
5876 | { | |
5877 | #ifdef SUPPORTS_READ_OFFSETS | |
5878 | return true; | |
5879 | #else | |
5880 | return false; | |
5881 | #endif | |
5882 | } | |
5883 | ||
52fb6437 NS |
5884 | /* Under uClinux, programs are loaded at non-zero offsets, which we need |
5885 | to tell gdb about. */ | |
5886 | ||
5203ae1e TBA |
5887 | int |
5888 | linux_process_target::read_offsets (CORE_ADDR *text_p, CORE_ADDR *data_p) | |
52fb6437 | 5889 | { |
5203ae1e | 5890 | #ifdef SUPPORTS_READ_OFFSETS |
52fb6437 | 5891 | unsigned long text, text_end, data; |
62828379 | 5892 | int pid = lwpid_of (current_thread); |
52fb6437 NS |
5893 | |
5894 | errno = 0; | |
5895 | ||
b8e1b30e LM |
5896 | text = ptrace (PTRACE_PEEKUSER, pid, (PTRACE_TYPE_ARG3) PT_TEXT_ADDR, |
5897 | (PTRACE_TYPE_ARG4) 0); | |
5898 | text_end = ptrace (PTRACE_PEEKUSER, pid, (PTRACE_TYPE_ARG3) PT_TEXT_END_ADDR, | |
5899 | (PTRACE_TYPE_ARG4) 0); | |
5900 | data = ptrace (PTRACE_PEEKUSER, pid, (PTRACE_TYPE_ARG3) PT_DATA_ADDR, | |
5901 | (PTRACE_TYPE_ARG4) 0); | |
52fb6437 NS |
5902 | |
5903 | if (errno == 0) | |
5904 | { | |
5905 | /* Both text and data offsets produced at compile-time (and so | |
1b3f6016 PA |
5906 | used by gdb) are relative to the beginning of the program, |
5907 | with the data segment immediately following the text segment. | |
5908 | However, the actual runtime layout in memory may put the data | |
5909 | somewhere else, so when we send gdb a data base-address, we | |
5910 | use the real data base address and subtract the compile-time | |
5911 | data base-address from it (which is just the length of the | |
5912 | text segment). BSS immediately follows data in both | |
5913 | cases. */ | |
52fb6437 NS |
5914 | *text_p = text; |
5915 | *data_p = data - (text_end - text); | |
1b3f6016 | 5916 | |
52fb6437 NS |
5917 | return 1; |
5918 | } | |
5203ae1e TBA |
5919 | return 0; |
5920 | #else | |
5921 | gdb_assert_not_reached ("target op read_offsets not supported"); | |
52fb6437 | 5922 | #endif |
5203ae1e | 5923 | } |
52fb6437 | 5924 | |
6e3fd7e9 TBA |
5925 | bool |
5926 | linux_process_target::supports_get_tls_address () | |
5927 | { | |
5928 | #ifdef USE_THREAD_DB | |
5929 | return true; | |
5930 | #else | |
5931 | return false; | |
5932 | #endif | |
5933 | } | |
5934 | ||
5935 | int | |
5936 | linux_process_target::get_tls_address (thread_info *thread, | |
5937 | CORE_ADDR offset, | |
5938 | CORE_ADDR load_module, | |
5939 | CORE_ADDR *address) | |
5940 | { | |
5941 | #ifdef USE_THREAD_DB | |
5942 | return thread_db_get_tls_address (thread, offset, load_module, address); | |
5943 | #else | |
5944 | return -1; | |
5945 | #endif | |
5946 | } | |
5947 | ||
2d0795ee TBA |
5948 | bool |
5949 | linux_process_target::supports_qxfer_osdata () | |
5950 | { | |
5951 | return true; | |
5952 | } | |
5953 | ||
5954 | int | |
5955 | linux_process_target::qxfer_osdata (const char *annex, | |
5956 | unsigned char *readbuf, | |
5957 | unsigned const char *writebuf, | |
5958 | CORE_ADDR offset, int len) | |
07e059b5 | 5959 | { |
d26e3629 | 5960 | return linux_common_xfer_osdata (annex, readbuf, offset, len); |
07e059b5 VP |
5961 | } |
5962 | ||
cb63de7c TBA |
5963 | void |
5964 | linux_process_target::siginfo_fixup (siginfo_t *siginfo, | |
5965 | gdb_byte *inf_siginfo, int direction) | |
d0722149 | 5966 | { |
cb63de7c | 5967 | bool done = low_siginfo_fixup (siginfo, inf_siginfo, direction); |
d0722149 DE |
5968 | |
5969 | /* If there was no callback, or the callback didn't do anything, | |
5970 | then just do a straight memcpy. */ | |
5971 | if (!done) | |
5972 | { | |
5973 | if (direction == 1) | |
a5362b9a | 5974 | memcpy (siginfo, inf_siginfo, sizeof (siginfo_t)); |
d0722149 | 5975 | else |
a5362b9a | 5976 | memcpy (inf_siginfo, siginfo, sizeof (siginfo_t)); |
d0722149 DE |
5977 | } |
5978 | } | |
5979 | ||
cb63de7c TBA |
5980 | bool |
5981 | linux_process_target::low_siginfo_fixup (siginfo_t *native, gdb_byte *inf, | |
5982 | int direction) | |
5983 | { | |
5984 | return false; | |
5985 | } | |
5986 | ||
d7abedf7 TBA |
5987 | bool |
5988 | linux_process_target::supports_qxfer_siginfo () | |
5989 | { | |
5990 | return true; | |
5991 | } | |
5992 | ||
5993 | int | |
5994 | linux_process_target::qxfer_siginfo (const char *annex, | |
5995 | unsigned char *readbuf, | |
5996 | unsigned const char *writebuf, | |
5997 | CORE_ADDR offset, int len) | |
4aa995e1 | 5998 | { |
d0722149 | 5999 | int pid; |
a5362b9a | 6000 | siginfo_t siginfo; |
8adce034 | 6001 | gdb_byte inf_siginfo[sizeof (siginfo_t)]; |
4aa995e1 | 6002 | |
0bfdf32f | 6003 | if (current_thread == NULL) |
4aa995e1 PA |
6004 | return -1; |
6005 | ||
0bfdf32f | 6006 | pid = lwpid_of (current_thread); |
4aa995e1 PA |
6007 | |
6008 | if (debug_threads) | |
87ce2a04 DE |
6009 | debug_printf ("%s siginfo for lwp %d.\n", |
6010 | readbuf != NULL ? "Reading" : "Writing", | |
6011 | pid); | |
4aa995e1 | 6012 | |
0adea5f7 | 6013 | if (offset >= sizeof (siginfo)) |
4aa995e1 PA |
6014 | return -1; |
6015 | ||
b8e1b30e | 6016 | if (ptrace (PTRACE_GETSIGINFO, pid, (PTRACE_TYPE_ARG3) 0, &siginfo) != 0) |
4aa995e1 PA |
6017 | return -1; |
6018 | ||
d0722149 DE |
6019 | /* When GDBSERVER is built as a 64-bit application, ptrace writes into |
6020 | SIGINFO an object with 64-bit layout. Since debugging a 32-bit | |
6021 | inferior with a 64-bit GDBSERVER should look the same as debugging it | |
6022 | with a 32-bit GDBSERVER, we need to convert it. */ | |
6023 | siginfo_fixup (&siginfo, inf_siginfo, 0); | |
6024 | ||
4aa995e1 PA |
6025 | if (offset + len > sizeof (siginfo)) |
6026 | len = sizeof (siginfo) - offset; | |
6027 | ||
6028 | if (readbuf != NULL) | |
d0722149 | 6029 | memcpy (readbuf, inf_siginfo + offset, len); |
4aa995e1 PA |
6030 | else |
6031 | { | |
d0722149 DE |
6032 | memcpy (inf_siginfo + offset, writebuf, len); |
6033 | ||
6034 | /* Convert back to ptrace layout before flushing it out. */ | |
6035 | siginfo_fixup (&siginfo, inf_siginfo, 1); | |
6036 | ||
b8e1b30e | 6037 | if (ptrace (PTRACE_SETSIGINFO, pid, (PTRACE_TYPE_ARG3) 0, &siginfo) != 0) |
4aa995e1 PA |
6038 | return -1; |
6039 | } | |
6040 | ||
6041 | return len; | |
6042 | } | |
6043 | ||
bd99dc85 PA |
6044 | /* SIGCHLD handler that serves two purposes: In non-stop/async mode, |
6045 | so we notice when children change state; as the handler for the | |
6046 | sigsuspend in my_waitpid. */ | |
6047 | ||
6048 | static void | |
6049 | sigchld_handler (int signo) | |
6050 | { | |
6051 | int old_errno = errno; | |
6052 | ||
6053 | if (debug_threads) | |
e581f2b4 PA |
6054 | { |
6055 | do | |
6056 | { | |
a7e559cc AH |
6057 | /* Use the async signal safe debug function. */ |
6058 | if (debug_write ("sigchld_handler\n", | |
6059 | sizeof ("sigchld_handler\n") - 1) < 0) | |
e581f2b4 PA |
6060 | break; /* just ignore */ |
6061 | } while (0); | |
6062 | } | |
bd99dc85 PA |
6063 | |
6064 | if (target_is_async_p ()) | |
6065 | async_file_mark (); /* trigger a linux_wait */ | |
6066 | ||
6067 | errno = old_errno; | |
6068 | } | |
6069 | ||
0dc587d4 TBA |
6070 | bool |
6071 | linux_process_target::supports_non_stop () | |
bd99dc85 | 6072 | { |
0dc587d4 | 6073 | return true; |
bd99dc85 PA |
6074 | } |
6075 | ||
0dc587d4 TBA |
6076 | bool |
6077 | linux_process_target::async (bool enable) | |
bd99dc85 | 6078 | { |
0dc587d4 | 6079 | bool previous = target_is_async_p (); |
bd99dc85 | 6080 | |
8336d594 | 6081 | if (debug_threads) |
87ce2a04 DE |
6082 | debug_printf ("linux_async (%d), previous=%d\n", |
6083 | enable, previous); | |
8336d594 | 6084 | |
bd99dc85 PA |
6085 | if (previous != enable) |
6086 | { | |
6087 | sigset_t mask; | |
6088 | sigemptyset (&mask); | |
6089 | sigaddset (&mask, SIGCHLD); | |
6090 | ||
21987b9c | 6091 | gdb_sigmask (SIG_BLOCK, &mask, NULL); |
bd99dc85 PA |
6092 | |
6093 | if (enable) | |
6094 | { | |
6095 | if (pipe (linux_event_pipe) == -1) | |
aa96c426 GB |
6096 | { |
6097 | linux_event_pipe[0] = -1; | |
6098 | linux_event_pipe[1] = -1; | |
21987b9c | 6099 | gdb_sigmask (SIG_UNBLOCK, &mask, NULL); |
aa96c426 GB |
6100 | |
6101 | warning ("creating event pipe failed."); | |
6102 | return previous; | |
6103 | } | |
bd99dc85 PA |
6104 | |
6105 | fcntl (linux_event_pipe[0], F_SETFL, O_NONBLOCK); | |
6106 | fcntl (linux_event_pipe[1], F_SETFL, O_NONBLOCK); | |
6107 | ||
6108 | /* Register the event loop handler. */ | |
6109 | add_file_handler (linux_event_pipe[0], | |
2554f6f5 SM |
6110 | handle_target_event, NULL, |
6111 | "linux-low"); | |
bd99dc85 PA |
6112 | |
6113 | /* Always trigger a linux_wait. */ | |
6114 | async_file_mark (); | |
6115 | } | |
6116 | else | |
6117 | { | |
6118 | delete_file_handler (linux_event_pipe[0]); | |
6119 | ||
6120 | close (linux_event_pipe[0]); | |
6121 | close (linux_event_pipe[1]); | |
6122 | linux_event_pipe[0] = -1; | |
6123 | linux_event_pipe[1] = -1; | |
6124 | } | |
6125 | ||
21987b9c | 6126 | gdb_sigmask (SIG_UNBLOCK, &mask, NULL); |
bd99dc85 PA |
6127 | } |
6128 | ||
6129 | return previous; | |
6130 | } | |
6131 | ||
0dc587d4 TBA |
6132 | int |
6133 | linux_process_target::start_non_stop (bool nonstop) | |
bd99dc85 PA |
6134 | { |
6135 | /* Register or unregister from event-loop accordingly. */ | |
0dc587d4 | 6136 | target_async (nonstop); |
aa96c426 | 6137 | |
0dc587d4 | 6138 | if (target_is_async_p () != (nonstop != false)) |
aa96c426 GB |
6139 | return -1; |
6140 | ||
bd99dc85 PA |
6141 | return 0; |
6142 | } | |
6143 | ||
652aef77 TBA |
6144 | bool |
6145 | linux_process_target::supports_multi_process () | |
cf8fd78b | 6146 | { |
652aef77 | 6147 | return true; |
cf8fd78b PA |
6148 | } |
6149 | ||
89245bc0 DB |
6150 | /* Check if fork events are supported. */ |
6151 | ||
9690a72a TBA |
6152 | bool |
6153 | linux_process_target::supports_fork_events () | |
89245bc0 DB |
6154 | { |
6155 | return linux_supports_tracefork (); | |
6156 | } | |
6157 | ||
6158 | /* Check if vfork events are supported. */ | |
6159 | ||
9690a72a TBA |
6160 | bool |
6161 | linux_process_target::supports_vfork_events () | |
89245bc0 DB |
6162 | { |
6163 | return linux_supports_tracefork (); | |
6164 | } | |
6165 | ||
94585166 DB |
6166 | /* Check if exec events are supported. */ |
6167 | ||
9690a72a TBA |
6168 | bool |
6169 | linux_process_target::supports_exec_events () | |
94585166 DB |
6170 | { |
6171 | return linux_supports_traceexec (); | |
6172 | } | |
6173 | ||
de0d863e DB |
6174 | /* Target hook for 'handle_new_gdb_connection'. Causes a reset of the |
6175 | ptrace flags for all inferiors. This is in case the new GDB connection | |
6176 | doesn't support the same set of events that the previous one did. */ | |
6177 | ||
fb00dfce TBA |
6178 | void |
6179 | linux_process_target::handle_new_gdb_connection () | |
de0d863e | 6180 | { |
de0d863e | 6181 | /* Request that all the lwps reset their ptrace options. */ |
bbf550d5 SM |
6182 | for_each_thread ([] (thread_info *thread) |
6183 | { | |
6184 | struct lwp_info *lwp = get_thread_lwp (thread); | |
6185 | ||
6186 | if (!lwp->stopped) | |
6187 | { | |
6188 | /* Stop the lwp so we can modify its ptrace options. */ | |
6189 | lwp->must_set_ptrace_flags = 1; | |
6190 | linux_stop_lwp (lwp); | |
6191 | } | |
6192 | else | |
6193 | { | |
6194 | /* Already stopped; go ahead and set the ptrace options. */ | |
6195 | struct process_info *proc = find_process_pid (pid_of (thread)); | |
6196 | int options = linux_low_ptrace_options (proc->attached); | |
6197 | ||
6198 | linux_enable_event_reporting (lwpid_of (thread), options); | |
6199 | lwp->must_set_ptrace_flags = 0; | |
6200 | } | |
6201 | }); | |
de0d863e DB |
6202 | } |
6203 | ||
55cf3021 TBA |
6204 | int |
6205 | linux_process_target::handle_monitor_command (char *mon) | |
6206 | { | |
6207 | #ifdef USE_THREAD_DB | |
6208 | return thread_db_handle_monitor_command (mon); | |
6209 | #else | |
6210 | return 0; | |
6211 | #endif | |
6212 | } | |
6213 | ||
95a45fc1 TBA |
6214 | int |
6215 | linux_process_target::core_of_thread (ptid_t ptid) | |
6216 | { | |
6217 | return linux_common_core_of_thread (ptid); | |
6218 | } | |
6219 | ||
c756403b TBA |
6220 | bool |
6221 | linux_process_target::supports_disable_randomization () | |
03583c20 | 6222 | { |
c756403b | 6223 | return true; |
03583c20 | 6224 | } |
efcbbd14 | 6225 | |
c0245cb9 TBA |
6226 | bool |
6227 | linux_process_target::supports_agent () | |
d1feda86 | 6228 | { |
c0245cb9 | 6229 | return true; |
d1feda86 YQ |
6230 | } |
6231 | ||
2526e0cd TBA |
6232 | bool |
6233 | linux_process_target::supports_range_stepping () | |
c2d6af84 | 6234 | { |
7582c77c | 6235 | if (supports_software_single_step ()) |
2526e0cd | 6236 | return true; |
c2d6af84 | 6237 | |
9cfd8715 TBA |
6238 | return low_supports_range_stepping (); |
6239 | } | |
6240 | ||
6241 | bool | |
6242 | linux_process_target::low_supports_range_stepping () | |
6243 | { | |
6244 | return false; | |
c2d6af84 PA |
6245 | } |
6246 | ||
8247b823 TBA |
6247 | bool |
6248 | linux_process_target::supports_pid_to_exec_file () | |
6249 | { | |
6250 | return true; | |
6251 | } | |
6252 | ||
04977957 | 6253 | const char * |
8247b823 TBA |
6254 | linux_process_target::pid_to_exec_file (int pid) |
6255 | { | |
6256 | return linux_proc_pid_to_exec_file (pid); | |
6257 | } | |
6258 | ||
c9b7b804 TBA |
6259 | bool |
6260 | linux_process_target::supports_multifs () | |
6261 | { | |
6262 | return true; | |
6263 | } | |
6264 | ||
6265 | int | |
6266 | linux_process_target::multifs_open (int pid, const char *filename, | |
6267 | int flags, mode_t mode) | |
6268 | { | |
6269 | return linux_mntns_open_cloexec (pid, filename, flags, mode); | |
6270 | } | |
6271 | ||
6272 | int | |
6273 | linux_process_target::multifs_unlink (int pid, const char *filename) | |
6274 | { | |
6275 | return linux_mntns_unlink (pid, filename); | |
6276 | } | |
6277 | ||
6278 | ssize_t | |
6279 | linux_process_target::multifs_readlink (int pid, const char *filename, | |
6280 | char *buf, size_t bufsiz) | |
6281 | { | |
6282 | return linux_mntns_readlink (pid, filename, buf, bufsiz); | |
6283 | } | |
6284 | ||
723b724b | 6285 | #if defined PT_GETDSBT || defined PTRACE_GETFDPIC |
78d85199 YQ |
6286 | struct target_loadseg |
6287 | { | |
6288 | /* Core address to which the segment is mapped. */ | |
6289 | Elf32_Addr addr; | |
6290 | /* VMA recorded in the program header. */ | |
6291 | Elf32_Addr p_vaddr; | |
6292 | /* Size of this segment in memory. */ | |
6293 | Elf32_Word p_memsz; | |
6294 | }; | |
6295 | ||
723b724b | 6296 | # if defined PT_GETDSBT |
78d85199 YQ |
6297 | struct target_loadmap |
6298 | { | |
6299 | /* Protocol version number, must be zero. */ | |
6300 | Elf32_Word version; | |
6301 | /* Pointer to the DSBT table, its size, and the DSBT index. */ | |
6302 | unsigned *dsbt_table; | |
6303 | unsigned dsbt_size, dsbt_index; | |
6304 | /* Number of segments in this map. */ | |
6305 | Elf32_Word nsegs; | |
6306 | /* The actual memory map. */ | |
6307 | struct target_loadseg segs[/*nsegs*/]; | |
6308 | }; | |
723b724b MF |
6309 | # define LINUX_LOADMAP PT_GETDSBT |
6310 | # define LINUX_LOADMAP_EXEC PTRACE_GETDSBT_EXEC | |
6311 | # define LINUX_LOADMAP_INTERP PTRACE_GETDSBT_INTERP | |
6312 | # else | |
6313 | struct target_loadmap | |
6314 | { | |
6315 | /* Protocol version number, must be zero. */ | |
6316 | Elf32_Half version; | |
6317 | /* Number of segments in this map. */ | |
6318 | Elf32_Half nsegs; | |
6319 | /* The actual memory map. */ | |
6320 | struct target_loadseg segs[/*nsegs*/]; | |
6321 | }; | |
6322 | # define LINUX_LOADMAP PTRACE_GETFDPIC | |
6323 | # define LINUX_LOADMAP_EXEC PTRACE_GETFDPIC_EXEC | |
6324 | # define LINUX_LOADMAP_INTERP PTRACE_GETFDPIC_INTERP | |
6325 | # endif | |
78d85199 | 6326 | |
9da41fda TBA |
6327 | bool |
6328 | linux_process_target::supports_read_loadmap () | |
6329 | { | |
6330 | return true; | |
6331 | } | |
6332 | ||
6333 | int | |
6334 | linux_process_target::read_loadmap (const char *annex, CORE_ADDR offset, | |
6335 | unsigned char *myaddr, unsigned int len) | |
78d85199 | 6336 | { |
0bfdf32f | 6337 | int pid = lwpid_of (current_thread); |
78d85199 YQ |
6338 | int addr = -1; |
6339 | struct target_loadmap *data = NULL; | |
6340 | unsigned int actual_length, copy_length; | |
6341 | ||
6342 | if (strcmp (annex, "exec") == 0) | |
723b724b | 6343 | addr = (int) LINUX_LOADMAP_EXEC; |
78d85199 | 6344 | else if (strcmp (annex, "interp") == 0) |
723b724b | 6345 | addr = (int) LINUX_LOADMAP_INTERP; |
78d85199 YQ |
6346 | else |
6347 | return -1; | |
6348 | ||
723b724b | 6349 | if (ptrace (LINUX_LOADMAP, pid, addr, &data) != 0) |
78d85199 YQ |
6350 | return -1; |
6351 | ||
6352 | if (data == NULL) | |
6353 | return -1; | |
6354 | ||
6355 | actual_length = sizeof (struct target_loadmap) | |
6356 | + sizeof (struct target_loadseg) * data->nsegs; | |
6357 | ||
6358 | if (offset < 0 || offset > actual_length) | |
6359 | return -1; | |
6360 | ||
6361 | copy_length = actual_length - offset < len ? actual_length - offset : len; | |
6362 | memcpy (myaddr, (char *) data + offset, copy_length); | |
6363 | return copy_length; | |
6364 | } | |
723b724b | 6365 | #endif /* defined PT_GETDSBT || defined PTRACE_GETFDPIC */ |
78d85199 | 6366 | |
bc8d3ae4 TBA |
6367 | bool |
6368 | linux_process_target::supports_catch_syscall () | |
82075af2 | 6369 | { |
9eedd27d | 6370 | return (low_supports_catch_syscall () |
82075af2 JS |
6371 | && linux_supports_tracesysgood ()); |
6372 | } | |
6373 | ||
9eedd27d TBA |
6374 | bool |
6375 | linux_process_target::low_supports_catch_syscall () | |
6376 | { | |
6377 | return false; | |
6378 | } | |
6379 | ||
770d8f6a TBA |
6380 | CORE_ADDR |
6381 | linux_process_target::read_pc (regcache *regcache) | |
219f2f23 | 6382 | { |
bf9ae9d8 | 6383 | if (!low_supports_breakpoints ()) |
219f2f23 PA |
6384 | return 0; |
6385 | ||
bf9ae9d8 | 6386 | return low_get_pc (regcache); |
219f2f23 PA |
6387 | } |
6388 | ||
770d8f6a TBA |
6389 | void |
6390 | linux_process_target::write_pc (regcache *regcache, CORE_ADDR pc) | |
219f2f23 | 6391 | { |
bf9ae9d8 | 6392 | gdb_assert (low_supports_breakpoints ()); |
219f2f23 | 6393 | |
bf9ae9d8 | 6394 | low_set_pc (regcache, pc); |
219f2f23 PA |
6395 | } |
6396 | ||
68119632 TBA |
6397 | bool |
6398 | linux_process_target::supports_thread_stopped () | |
6399 | { | |
6400 | return true; | |
6401 | } | |
6402 | ||
6403 | bool | |
6404 | linux_process_target::thread_stopped (thread_info *thread) | |
8336d594 PA |
6405 | { |
6406 | return get_thread_lwp (thread)->stopped; | |
6407 | } | |
6408 | ||
6409 | /* This exposes stop-all-threads functionality to other modules. */ | |
6410 | ||
29e8dc09 TBA |
6411 | void |
6412 | linux_process_target::pause_all (bool freeze) | |
8336d594 | 6413 | { |
7984d532 PA |
6414 | stop_all_lwps (freeze, NULL); |
6415 | } | |
6416 | ||
6417 | /* This exposes unstop-all-threads functionality to other gdbserver | |
6418 | modules. */ | |
6419 | ||
29e8dc09 TBA |
6420 | void |
6421 | linux_process_target::unpause_all (bool unfreeze) | |
7984d532 PA |
6422 | { |
6423 | unstop_all_lwps (unfreeze, NULL); | |
8336d594 PA |
6424 | } |
6425 | ||
79b44087 TBA |
6426 | int |
6427 | linux_process_target::prepare_to_access_memory () | |
90d74c30 PA |
6428 | { |
6429 | /* Neither ptrace nor /proc/PID/mem allow accessing memory through a | |
6430 | running LWP. */ | |
6431 | if (non_stop) | |
29e8dc09 | 6432 | target_pause_all (true); |
90d74c30 PA |
6433 | return 0; |
6434 | } | |
6435 | ||
79b44087 TBA |
6436 | void |
6437 | linux_process_target::done_accessing_memory () | |
90d74c30 PA |
6438 | { |
6439 | /* Neither ptrace nor /proc/PID/mem allow accessing memory through a | |
6440 | running LWP. */ | |
6441 | if (non_stop) | |
29e8dc09 | 6442 | target_unpause_all (true); |
90d74c30 PA |
6443 | } |
6444 | ||
2268b414 JK |
6445 | /* Extract &phdr and num_phdr in the inferior. Return 0 on success. */ |
6446 | ||
6447 | static int | |
6448 | get_phdr_phnum_from_proc_auxv (const int pid, const int is_elf64, | |
6449 | CORE_ADDR *phdr_memaddr, int *num_phdr) | |
6450 | { | |
6451 | char filename[PATH_MAX]; | |
6452 | int fd; | |
6453 | const int auxv_size = is_elf64 | |
6454 | ? sizeof (Elf64_auxv_t) : sizeof (Elf32_auxv_t); | |
6455 | char buf[sizeof (Elf64_auxv_t)]; /* The larger of the two. */ | |
6456 | ||
6457 | xsnprintf (filename, sizeof filename, "/proc/%d/auxv", pid); | |
6458 | ||
6459 | fd = open (filename, O_RDONLY); | |
6460 | if (fd < 0) | |
6461 | return 1; | |
6462 | ||
6463 | *phdr_memaddr = 0; | |
6464 | *num_phdr = 0; | |
6465 | while (read (fd, buf, auxv_size) == auxv_size | |
6466 | && (*phdr_memaddr == 0 || *num_phdr == 0)) | |
6467 | { | |
6468 | if (is_elf64) | |
6469 | { | |
6470 | Elf64_auxv_t *const aux = (Elf64_auxv_t *) buf; | |
6471 | ||
6472 | switch (aux->a_type) | |
6473 | { | |
6474 | case AT_PHDR: | |
6475 | *phdr_memaddr = aux->a_un.a_val; | |
6476 | break; | |
6477 | case AT_PHNUM: | |
6478 | *num_phdr = aux->a_un.a_val; | |
6479 | break; | |
6480 | } | |
6481 | } | |
6482 | else | |
6483 | { | |
6484 | Elf32_auxv_t *const aux = (Elf32_auxv_t *) buf; | |
6485 | ||
6486 | switch (aux->a_type) | |
6487 | { | |
6488 | case AT_PHDR: | |
6489 | *phdr_memaddr = aux->a_un.a_val; | |
6490 | break; | |
6491 | case AT_PHNUM: | |
6492 | *num_phdr = aux->a_un.a_val; | |
6493 | break; | |
6494 | } | |
6495 | } | |
6496 | } | |
6497 | ||
6498 | close (fd); | |
6499 | ||
6500 | if (*phdr_memaddr == 0 || *num_phdr == 0) | |
6501 | { | |
6502 | warning ("Unexpected missing AT_PHDR and/or AT_PHNUM: " | |
6503 | "phdr_memaddr = %ld, phdr_num = %d", | |
6504 | (long) *phdr_memaddr, *num_phdr); | |
6505 | return 2; | |
6506 | } | |
6507 | ||
6508 | return 0; | |
6509 | } | |
6510 | ||
6511 | /* Return &_DYNAMIC (via PT_DYNAMIC) in the inferior, or 0 if not present. */ | |
6512 | ||
6513 | static CORE_ADDR | |
6514 | get_dynamic (const int pid, const int is_elf64) | |
6515 | { | |
6516 | CORE_ADDR phdr_memaddr, relocation; | |
db1ff28b | 6517 | int num_phdr, i; |
2268b414 | 6518 | unsigned char *phdr_buf; |
db1ff28b | 6519 | const int phdr_size = is_elf64 ? sizeof (Elf64_Phdr) : sizeof (Elf32_Phdr); |
2268b414 JK |
6520 | |
6521 | if (get_phdr_phnum_from_proc_auxv (pid, is_elf64, &phdr_memaddr, &num_phdr)) | |
6522 | return 0; | |
6523 | ||
6524 | gdb_assert (num_phdr < 100); /* Basic sanity check. */ | |
224c3ddb | 6525 | phdr_buf = (unsigned char *) alloca (num_phdr * phdr_size); |
2268b414 JK |
6526 | |
6527 | if (linux_read_memory (phdr_memaddr, phdr_buf, num_phdr * phdr_size)) | |
6528 | return 0; | |
6529 | ||
6530 | /* Compute relocation: it is expected to be 0 for "regular" executables, | |
6531 | non-zero for PIE ones. */ | |
6532 | relocation = -1; | |
db1ff28b JK |
6533 | for (i = 0; relocation == -1 && i < num_phdr; i++) |
6534 | if (is_elf64) | |
6535 | { | |
6536 | Elf64_Phdr *const p = (Elf64_Phdr *) (phdr_buf + i * phdr_size); | |
6537 | ||
6538 | if (p->p_type == PT_PHDR) | |
6539 | relocation = phdr_memaddr - p->p_vaddr; | |
6540 | } | |
6541 | else | |
6542 | { | |
6543 | Elf32_Phdr *const p = (Elf32_Phdr *) (phdr_buf + i * phdr_size); | |
6544 | ||
6545 | if (p->p_type == PT_PHDR) | |
6546 | relocation = phdr_memaddr - p->p_vaddr; | |
6547 | } | |
6548 | ||
2268b414 JK |
6549 | if (relocation == -1) |
6550 | { | |
e237a7e2 JK |
6551 | /* PT_PHDR is optional, but necessary for PIE in general. Fortunately |
6552 | any real world executables, including PIE executables, have always | |
6553 | PT_PHDR present. PT_PHDR is not present in some shared libraries or | |
6554 | in fpc (Free Pascal 2.4) binaries but neither of those have a need for | |
6555 | or present DT_DEBUG anyway (fpc binaries are statically linked). | |
6556 | ||
6557 | Therefore if there exists DT_DEBUG there is always also PT_PHDR. | |
6558 | ||
6559 | GDB could find RELOCATION also from AT_ENTRY - e_entry. */ | |
6560 | ||
2268b414 JK |
6561 | return 0; |
6562 | } | |
6563 | ||
db1ff28b JK |
6564 | for (i = 0; i < num_phdr; i++) |
6565 | { | |
6566 | if (is_elf64) | |
6567 | { | |
6568 | Elf64_Phdr *const p = (Elf64_Phdr *) (phdr_buf + i * phdr_size); | |
6569 | ||
6570 | if (p->p_type == PT_DYNAMIC) | |
6571 | return p->p_vaddr + relocation; | |
6572 | } | |
6573 | else | |
6574 | { | |
6575 | Elf32_Phdr *const p = (Elf32_Phdr *) (phdr_buf + i * phdr_size); | |
2268b414 | 6576 | |
db1ff28b JK |
6577 | if (p->p_type == PT_DYNAMIC) |
6578 | return p->p_vaddr + relocation; | |
6579 | } | |
6580 | } | |
2268b414 JK |
6581 | |
6582 | return 0; | |
6583 | } | |
6584 | ||
6585 | /* Return &_r_debug in the inferior, or -1 if not present. Return value | |
367ba2c2 MR |
6586 | can be 0 if the inferior does not yet have the library list initialized. |
6587 | We look for DT_MIPS_RLD_MAP first. MIPS executables use this instead of | |
6588 | DT_DEBUG, although they sometimes contain an unused DT_DEBUG entry too. */ | |
2268b414 JK |
6589 | |
6590 | static CORE_ADDR | |
6591 | get_r_debug (const int pid, const int is_elf64) | |
6592 | { | |
6593 | CORE_ADDR dynamic_memaddr; | |
6594 | const int dyn_size = is_elf64 ? sizeof (Elf64_Dyn) : sizeof (Elf32_Dyn); | |
6595 | unsigned char buf[sizeof (Elf64_Dyn)]; /* The larger of the two. */ | |
367ba2c2 | 6596 | CORE_ADDR map = -1; |
2268b414 JK |
6597 | |
6598 | dynamic_memaddr = get_dynamic (pid, is_elf64); | |
6599 | if (dynamic_memaddr == 0) | |
367ba2c2 | 6600 | return map; |
2268b414 JK |
6601 | |
6602 | while (linux_read_memory (dynamic_memaddr, buf, dyn_size) == 0) | |
6603 | { | |
6604 | if (is_elf64) | |
6605 | { | |
6606 | Elf64_Dyn *const dyn = (Elf64_Dyn *) buf; | |
a738da3a | 6607 | #if defined DT_MIPS_RLD_MAP || defined DT_MIPS_RLD_MAP_REL |
367ba2c2 MR |
6608 | union |
6609 | { | |
6610 | Elf64_Xword map; | |
6611 | unsigned char buf[sizeof (Elf64_Xword)]; | |
6612 | } | |
6613 | rld_map; | |
a738da3a MF |
6614 | #endif |
6615 | #ifdef DT_MIPS_RLD_MAP | |
367ba2c2 MR |
6616 | if (dyn->d_tag == DT_MIPS_RLD_MAP) |
6617 | { | |
6618 | if (linux_read_memory (dyn->d_un.d_val, | |
6619 | rld_map.buf, sizeof (rld_map.buf)) == 0) | |
6620 | return rld_map.map; | |
6621 | else | |
6622 | break; | |
6623 | } | |
75f62ce7 | 6624 | #endif /* DT_MIPS_RLD_MAP */ |
a738da3a MF |
6625 | #ifdef DT_MIPS_RLD_MAP_REL |
6626 | if (dyn->d_tag == DT_MIPS_RLD_MAP_REL) | |
6627 | { | |
6628 | if (linux_read_memory (dyn->d_un.d_val + dynamic_memaddr, | |
6629 | rld_map.buf, sizeof (rld_map.buf)) == 0) | |
6630 | return rld_map.map; | |
6631 | else | |
6632 | break; | |
6633 | } | |
6634 | #endif /* DT_MIPS_RLD_MAP_REL */ | |
2268b414 | 6635 | |
367ba2c2 MR |
6636 | if (dyn->d_tag == DT_DEBUG && map == -1) |
6637 | map = dyn->d_un.d_val; | |
2268b414 JK |
6638 | |
6639 | if (dyn->d_tag == DT_NULL) | |
6640 | break; | |
6641 | } | |
6642 | else | |
6643 | { | |
6644 | Elf32_Dyn *const dyn = (Elf32_Dyn *) buf; | |
a738da3a | 6645 | #if defined DT_MIPS_RLD_MAP || defined DT_MIPS_RLD_MAP_REL |
367ba2c2 MR |
6646 | union |
6647 | { | |
6648 | Elf32_Word map; | |
6649 | unsigned char buf[sizeof (Elf32_Word)]; | |
6650 | } | |
6651 | rld_map; | |
a738da3a MF |
6652 | #endif |
6653 | #ifdef DT_MIPS_RLD_MAP | |
367ba2c2 MR |
6654 | if (dyn->d_tag == DT_MIPS_RLD_MAP) |
6655 | { | |
6656 | if (linux_read_memory (dyn->d_un.d_val, | |
6657 | rld_map.buf, sizeof (rld_map.buf)) == 0) | |
6658 | return rld_map.map; | |
6659 | else | |
6660 | break; | |
6661 | } | |
75f62ce7 | 6662 | #endif /* DT_MIPS_RLD_MAP */ |
a738da3a MF |
6663 | #ifdef DT_MIPS_RLD_MAP_REL |
6664 | if (dyn->d_tag == DT_MIPS_RLD_MAP_REL) | |
6665 | { | |
6666 | if (linux_read_memory (dyn->d_un.d_val + dynamic_memaddr, | |
6667 | rld_map.buf, sizeof (rld_map.buf)) == 0) | |
6668 | return rld_map.map; | |
6669 | else | |
6670 | break; | |
6671 | } | |
6672 | #endif /* DT_MIPS_RLD_MAP_REL */ | |
2268b414 | 6673 | |
367ba2c2 MR |
6674 | if (dyn->d_tag == DT_DEBUG && map == -1) |
6675 | map = dyn->d_un.d_val; | |
2268b414 JK |
6676 | |
6677 | if (dyn->d_tag == DT_NULL) | |
6678 | break; | |
6679 | } | |
6680 | ||
6681 | dynamic_memaddr += dyn_size; | |
6682 | } | |
6683 | ||
367ba2c2 | 6684 | return map; |
2268b414 JK |
6685 | } |
6686 | ||
6687 | /* Read one pointer from MEMADDR in the inferior. */ | |
6688 | ||
6689 | static int | |
6690 | read_one_ptr (CORE_ADDR memaddr, CORE_ADDR *ptr, int ptr_size) | |
6691 | { | |
485f1ee4 PA |
6692 | int ret; |
6693 | ||
6694 | /* Go through a union so this works on either big or little endian | |
6695 | hosts, when the inferior's pointer size is smaller than the size | |
6696 | of CORE_ADDR. It is assumed the inferior's endianness is the | |
6697 | same of the superior's. */ | |
6698 | union | |
6699 | { | |
6700 | CORE_ADDR core_addr; | |
6701 | unsigned int ui; | |
6702 | unsigned char uc; | |
6703 | } addr; | |
6704 | ||
6705 | ret = linux_read_memory (memaddr, &addr.uc, ptr_size); | |
6706 | if (ret == 0) | |
6707 | { | |
6708 | if (ptr_size == sizeof (CORE_ADDR)) | |
6709 | *ptr = addr.core_addr; | |
6710 | else if (ptr_size == sizeof (unsigned int)) | |
6711 | *ptr = addr.ui; | |
6712 | else | |
6713 | gdb_assert_not_reached ("unhandled pointer size"); | |
6714 | } | |
6715 | return ret; | |
2268b414 JK |
6716 | } |
6717 | ||
974387bb TBA |
6718 | bool |
6719 | linux_process_target::supports_qxfer_libraries_svr4 () | |
6720 | { | |
6721 | return true; | |
6722 | } | |
6723 | ||
2268b414 JK |
6724 | struct link_map_offsets |
6725 | { | |
6726 | /* Offset and size of r_debug.r_version. */ | |
6727 | int r_version_offset; | |
6728 | ||
6729 | /* Offset and size of r_debug.r_map. */ | |
6730 | int r_map_offset; | |
6731 | ||
6732 | /* Offset to l_addr field in struct link_map. */ | |
6733 | int l_addr_offset; | |
6734 | ||
6735 | /* Offset to l_name field in struct link_map. */ | |
6736 | int l_name_offset; | |
6737 | ||
6738 | /* Offset to l_ld field in struct link_map. */ | |
6739 | int l_ld_offset; | |
6740 | ||
6741 | /* Offset to l_next field in struct link_map. */ | |
6742 | int l_next_offset; | |
6743 | ||
6744 | /* Offset to l_prev field in struct link_map. */ | |
6745 | int l_prev_offset; | |
6746 | }; | |
6747 | ||
fb723180 | 6748 | /* Construct qXfer:libraries-svr4:read reply. */ |
2268b414 | 6749 | |
974387bb TBA |
6750 | int |
6751 | linux_process_target::qxfer_libraries_svr4 (const char *annex, | |
6752 | unsigned char *readbuf, | |
6753 | unsigned const char *writebuf, | |
6754 | CORE_ADDR offset, int len) | |
2268b414 | 6755 | { |
fe978cb0 | 6756 | struct process_info_private *const priv = current_process ()->priv; |
2268b414 JK |
6757 | char filename[PATH_MAX]; |
6758 | int pid, is_elf64; | |
6759 | ||
6760 | static const struct link_map_offsets lmo_32bit_offsets = | |
6761 | { | |
6762 | 0, /* r_version offset. */ | |
6763 | 4, /* r_debug.r_map offset. */ | |
6764 | 0, /* l_addr offset in link_map. */ | |
6765 | 4, /* l_name offset in link_map. */ | |
6766 | 8, /* l_ld offset in link_map. */ | |
6767 | 12, /* l_next offset in link_map. */ | |
6768 | 16 /* l_prev offset in link_map. */ | |
6769 | }; | |
6770 | ||
6771 | static const struct link_map_offsets lmo_64bit_offsets = | |
6772 | { | |
6773 | 0, /* r_version offset. */ | |
6774 | 8, /* r_debug.r_map offset. */ | |
6775 | 0, /* l_addr offset in link_map. */ | |
6776 | 8, /* l_name offset in link_map. */ | |
6777 | 16, /* l_ld offset in link_map. */ | |
6778 | 24, /* l_next offset in link_map. */ | |
6779 | 32 /* l_prev offset in link_map. */ | |
6780 | }; | |
6781 | const struct link_map_offsets *lmo; | |
214d508e | 6782 | unsigned int machine; |
b1fbec62 GB |
6783 | int ptr_size; |
6784 | CORE_ADDR lm_addr = 0, lm_prev = 0; | |
b1fbec62 GB |
6785 | CORE_ADDR l_name, l_addr, l_ld, l_next, l_prev; |
6786 | int header_done = 0; | |
2268b414 JK |
6787 | |
6788 | if (writebuf != NULL) | |
6789 | return -2; | |
6790 | if (readbuf == NULL) | |
6791 | return -1; | |
6792 | ||
0bfdf32f | 6793 | pid = lwpid_of (current_thread); |
2268b414 | 6794 | xsnprintf (filename, sizeof filename, "/proc/%d/exe", pid); |
214d508e | 6795 | is_elf64 = elf_64_file_p (filename, &machine); |
2268b414 | 6796 | lmo = is_elf64 ? &lmo_64bit_offsets : &lmo_32bit_offsets; |
b1fbec62 | 6797 | ptr_size = is_elf64 ? 8 : 4; |
2268b414 | 6798 | |
b1fbec62 GB |
6799 | while (annex[0] != '\0') |
6800 | { | |
6801 | const char *sep; | |
6802 | CORE_ADDR *addrp; | |
da4ae14a | 6803 | int name_len; |
2268b414 | 6804 | |
b1fbec62 GB |
6805 | sep = strchr (annex, '='); |
6806 | if (sep == NULL) | |
6807 | break; | |
0c5bf5a9 | 6808 | |
da4ae14a TT |
6809 | name_len = sep - annex; |
6810 | if (name_len == 5 && startswith (annex, "start")) | |
b1fbec62 | 6811 | addrp = &lm_addr; |
da4ae14a | 6812 | else if (name_len == 4 && startswith (annex, "prev")) |
b1fbec62 GB |
6813 | addrp = &lm_prev; |
6814 | else | |
6815 | { | |
6816 | annex = strchr (sep, ';'); | |
6817 | if (annex == NULL) | |
6818 | break; | |
6819 | annex++; | |
6820 | continue; | |
6821 | } | |
6822 | ||
6823 | annex = decode_address_to_semicolon (addrp, sep + 1); | |
2268b414 | 6824 | } |
b1fbec62 GB |
6825 | |
6826 | if (lm_addr == 0) | |
2268b414 | 6827 | { |
b1fbec62 GB |
6828 | int r_version = 0; |
6829 | ||
6830 | if (priv->r_debug == 0) | |
6831 | priv->r_debug = get_r_debug (pid, is_elf64); | |
6832 | ||
6833 | /* We failed to find DT_DEBUG. Such situation will not change | |
6834 | for this inferior - do not retry it. Report it to GDB as | |
6835 | E01, see for the reasons at the GDB solib-svr4.c side. */ | |
6836 | if (priv->r_debug == (CORE_ADDR) -1) | |
6837 | return -1; | |
6838 | ||
6839 | if (priv->r_debug != 0) | |
2268b414 | 6840 | { |
b1fbec62 GB |
6841 | if (linux_read_memory (priv->r_debug + lmo->r_version_offset, |
6842 | (unsigned char *) &r_version, | |
6843 | sizeof (r_version)) != 0 | |
6844 | || r_version != 1) | |
6845 | { | |
6846 | warning ("unexpected r_debug version %d", r_version); | |
6847 | } | |
6848 | else if (read_one_ptr (priv->r_debug + lmo->r_map_offset, | |
6849 | &lm_addr, ptr_size) != 0) | |
6850 | { | |
6851 | warning ("unable to read r_map from 0x%lx", | |
6852 | (long) priv->r_debug + lmo->r_map_offset); | |
6853 | } | |
2268b414 | 6854 | } |
b1fbec62 | 6855 | } |
2268b414 | 6856 | |
f6e8a41e | 6857 | std::string document = "<library-list-svr4 version=\"1.0\""; |
b1fbec62 GB |
6858 | |
6859 | while (lm_addr | |
6860 | && read_one_ptr (lm_addr + lmo->l_name_offset, | |
6861 | &l_name, ptr_size) == 0 | |
6862 | && read_one_ptr (lm_addr + lmo->l_addr_offset, | |
6863 | &l_addr, ptr_size) == 0 | |
6864 | && read_one_ptr (lm_addr + lmo->l_ld_offset, | |
6865 | &l_ld, ptr_size) == 0 | |
6866 | && read_one_ptr (lm_addr + lmo->l_prev_offset, | |
6867 | &l_prev, ptr_size) == 0 | |
6868 | && read_one_ptr (lm_addr + lmo->l_next_offset, | |
6869 | &l_next, ptr_size) == 0) | |
6870 | { | |
6871 | unsigned char libname[PATH_MAX]; | |
6872 | ||
6873 | if (lm_prev != l_prev) | |
2268b414 | 6874 | { |
b1fbec62 GB |
6875 | warning ("Corrupted shared library list: 0x%lx != 0x%lx", |
6876 | (long) lm_prev, (long) l_prev); | |
6877 | break; | |
2268b414 JK |
6878 | } |
6879 | ||
d878444c JK |
6880 | /* Ignore the first entry even if it has valid name as the first entry |
6881 | corresponds to the main executable. The first entry should not be | |
6882 | skipped if the dynamic loader was loaded late by a static executable | |
6883 | (see solib-svr4.c parameter ignore_first). But in such case the main | |
6884 | executable does not have PT_DYNAMIC present and this function already | |
6885 | exited above due to failed get_r_debug. */ | |
6886 | if (lm_prev == 0) | |
f6e8a41e | 6887 | string_appendf (document, " main-lm=\"0x%lx\"", (unsigned long) lm_addr); |
d878444c JK |
6888 | else |
6889 | { | |
6890 | /* Not checking for error because reading may stop before | |
6891 | we've got PATH_MAX worth of characters. */ | |
6892 | libname[0] = '\0'; | |
6893 | linux_read_memory (l_name, libname, sizeof (libname) - 1); | |
6894 | libname[sizeof (libname) - 1] = '\0'; | |
6895 | if (libname[0] != '\0') | |
2268b414 | 6896 | { |
d878444c JK |
6897 | if (!header_done) |
6898 | { | |
6899 | /* Terminate `<library-list-svr4'. */ | |
f6e8a41e | 6900 | document += '>'; |
d878444c JK |
6901 | header_done = 1; |
6902 | } | |
2268b414 | 6903 | |
e6a58aa8 SM |
6904 | string_appendf (document, "<library name=\""); |
6905 | xml_escape_text_append (&document, (char *) libname); | |
6906 | string_appendf (document, "\" lm=\"0x%lx\" " | |
f6e8a41e | 6907 | "l_addr=\"0x%lx\" l_ld=\"0x%lx\"/>", |
e6a58aa8 SM |
6908 | (unsigned long) lm_addr, (unsigned long) l_addr, |
6909 | (unsigned long) l_ld); | |
d878444c | 6910 | } |
0afae3cf | 6911 | } |
b1fbec62 GB |
6912 | |
6913 | lm_prev = lm_addr; | |
6914 | lm_addr = l_next; | |
2268b414 JK |
6915 | } |
6916 | ||
b1fbec62 GB |
6917 | if (!header_done) |
6918 | { | |
6919 | /* Empty list; terminate `<library-list-svr4'. */ | |
f6e8a41e | 6920 | document += "/>"; |
b1fbec62 GB |
6921 | } |
6922 | else | |
f6e8a41e | 6923 | document += "</library-list-svr4>"; |
b1fbec62 | 6924 | |
f6e8a41e | 6925 | int document_len = document.length (); |
2268b414 JK |
6926 | if (offset < document_len) |
6927 | document_len -= offset; | |
6928 | else | |
6929 | document_len = 0; | |
6930 | if (len > document_len) | |
6931 | len = document_len; | |
6932 | ||
f6e8a41e | 6933 | memcpy (readbuf, document.data () + offset, len); |
2268b414 JK |
6934 | |
6935 | return len; | |
6936 | } | |
6937 | ||
9accd112 MM |
6938 | #ifdef HAVE_LINUX_BTRACE |
6939 | ||
79597bdd TBA |
6940 | btrace_target_info * |
6941 | linux_process_target::enable_btrace (ptid_t ptid, | |
6942 | const btrace_config *conf) | |
6943 | { | |
6944 | return linux_enable_btrace (ptid, conf); | |
6945 | } | |
6946 | ||
969c39fb | 6947 | /* See to_disable_btrace target method. */ |
9accd112 | 6948 | |
79597bdd TBA |
6949 | int |
6950 | linux_process_target::disable_btrace (btrace_target_info *tinfo) | |
969c39fb MM |
6951 | { |
6952 | enum btrace_error err; | |
6953 | ||
6954 | err = linux_disable_btrace (tinfo); | |
6955 | return (err == BTRACE_ERR_NONE ? 0 : -1); | |
6956 | } | |
6957 | ||
bc504a31 | 6958 | /* Encode an Intel Processor Trace configuration. */ |
b20a6524 MM |
6959 | |
6960 | static void | |
6961 | linux_low_encode_pt_config (struct buffer *buffer, | |
6962 | const struct btrace_data_pt_config *config) | |
6963 | { | |
6964 | buffer_grow_str (buffer, "<pt-config>\n"); | |
6965 | ||
6966 | switch (config->cpu.vendor) | |
6967 | { | |
6968 | case CV_INTEL: | |
6969 | buffer_xml_printf (buffer, "<cpu vendor=\"GenuineIntel\" family=\"%u\" " | |
6970 | "model=\"%u\" stepping=\"%u\"/>\n", | |
6971 | config->cpu.family, config->cpu.model, | |
6972 | config->cpu.stepping); | |
6973 | break; | |
6974 | ||
6975 | default: | |
6976 | break; | |
6977 | } | |
6978 | ||
6979 | buffer_grow_str (buffer, "</pt-config>\n"); | |
6980 | } | |
6981 | ||
6982 | /* Encode a raw buffer. */ | |
6983 | ||
6984 | static void | |
6985 | linux_low_encode_raw (struct buffer *buffer, const gdb_byte *data, | |
6986 | unsigned int size) | |
6987 | { | |
6988 | if (size == 0) | |
6989 | return; | |
6990 | ||
268a13a5 | 6991 | /* We use hex encoding - see gdbsupport/rsp-low.h. */ |
b20a6524 MM |
6992 | buffer_grow_str (buffer, "<raw>\n"); |
6993 | ||
6994 | while (size-- > 0) | |
6995 | { | |
6996 | char elem[2]; | |
6997 | ||
6998 | elem[0] = tohex ((*data >> 4) & 0xf); | |
6999 | elem[1] = tohex (*data++ & 0xf); | |
7000 | ||
7001 | buffer_grow (buffer, elem, 2); | |
7002 | } | |
7003 | ||
7004 | buffer_grow_str (buffer, "</raw>\n"); | |
7005 | } | |
7006 | ||
969c39fb MM |
7007 | /* See to_read_btrace target method. */ |
7008 | ||
79597bdd TBA |
7009 | int |
7010 | linux_process_target::read_btrace (btrace_target_info *tinfo, | |
7011 | buffer *buffer, | |
7012 | enum btrace_read_type type) | |
9accd112 | 7013 | { |
734b0e4b | 7014 | struct btrace_data btrace; |
969c39fb | 7015 | enum btrace_error err; |
9accd112 | 7016 | |
969c39fb MM |
7017 | err = linux_read_btrace (&btrace, tinfo, type); |
7018 | if (err != BTRACE_ERR_NONE) | |
7019 | { | |
7020 | if (err == BTRACE_ERR_OVERFLOW) | |
7021 | buffer_grow_str0 (buffer, "E.Overflow."); | |
7022 | else | |
7023 | buffer_grow_str0 (buffer, "E.Generic Error."); | |
7024 | ||
8dcc53b3 | 7025 | return -1; |
969c39fb | 7026 | } |
9accd112 | 7027 | |
734b0e4b MM |
7028 | switch (btrace.format) |
7029 | { | |
7030 | case BTRACE_FORMAT_NONE: | |
7031 | buffer_grow_str0 (buffer, "E.No Trace."); | |
8dcc53b3 | 7032 | return -1; |
734b0e4b MM |
7033 | |
7034 | case BTRACE_FORMAT_BTS: | |
7035 | buffer_grow_str (buffer, "<!DOCTYPE btrace SYSTEM \"btrace.dtd\">\n"); | |
7036 | buffer_grow_str (buffer, "<btrace version=\"1.0\">\n"); | |
9accd112 | 7037 | |
46f29a9a | 7038 | for (const btrace_block &block : *btrace.variant.bts.blocks) |
734b0e4b | 7039 | buffer_xml_printf (buffer, "<block begin=\"0x%s\" end=\"0x%s\"/>\n", |
46f29a9a | 7040 | paddress (block.begin), paddress (block.end)); |
9accd112 | 7041 | |
734b0e4b MM |
7042 | buffer_grow_str0 (buffer, "</btrace>\n"); |
7043 | break; | |
7044 | ||
b20a6524 MM |
7045 | case BTRACE_FORMAT_PT: |
7046 | buffer_grow_str (buffer, "<!DOCTYPE btrace SYSTEM \"btrace.dtd\">\n"); | |
7047 | buffer_grow_str (buffer, "<btrace version=\"1.0\">\n"); | |
7048 | buffer_grow_str (buffer, "<pt>\n"); | |
7049 | ||
7050 | linux_low_encode_pt_config (buffer, &btrace.variant.pt.config); | |
9accd112 | 7051 | |
b20a6524 MM |
7052 | linux_low_encode_raw (buffer, btrace.variant.pt.data, |
7053 | btrace.variant.pt.size); | |
7054 | ||
7055 | buffer_grow_str (buffer, "</pt>\n"); | |
7056 | buffer_grow_str0 (buffer, "</btrace>\n"); | |
7057 | break; | |
7058 | ||
7059 | default: | |
7060 | buffer_grow_str0 (buffer, "E.Unsupported Trace Format."); | |
8dcc53b3 | 7061 | return -1; |
734b0e4b | 7062 | } |
969c39fb MM |
7063 | |
7064 | return 0; | |
9accd112 | 7065 | } |
f4abbc16 MM |
7066 | |
7067 | /* See to_btrace_conf target method. */ | |
7068 | ||
79597bdd TBA |
7069 | int |
7070 | linux_process_target::read_btrace_conf (const btrace_target_info *tinfo, | |
7071 | buffer *buffer) | |
f4abbc16 MM |
7072 | { |
7073 | const struct btrace_config *conf; | |
7074 | ||
7075 | buffer_grow_str (buffer, "<!DOCTYPE btrace-conf SYSTEM \"btrace-conf.dtd\">\n"); | |
7076 | buffer_grow_str (buffer, "<btrace-conf version=\"1.0\">\n"); | |
7077 | ||
7078 | conf = linux_btrace_conf (tinfo); | |
7079 | if (conf != NULL) | |
7080 | { | |
7081 | switch (conf->format) | |
7082 | { | |
7083 | case BTRACE_FORMAT_NONE: | |
7084 | break; | |
7085 | ||
7086 | case BTRACE_FORMAT_BTS: | |
d33501a5 MM |
7087 | buffer_xml_printf (buffer, "<bts"); |
7088 | buffer_xml_printf (buffer, " size=\"0x%x\"", conf->bts.size); | |
7089 | buffer_xml_printf (buffer, " />\n"); | |
f4abbc16 | 7090 | break; |
b20a6524 MM |
7091 | |
7092 | case BTRACE_FORMAT_PT: | |
7093 | buffer_xml_printf (buffer, "<pt"); | |
7094 | buffer_xml_printf (buffer, " size=\"0x%x\"", conf->pt.size); | |
7095 | buffer_xml_printf (buffer, "/>\n"); | |
7096 | break; | |
f4abbc16 MM |
7097 | } |
7098 | } | |
7099 | ||
7100 | buffer_grow_str0 (buffer, "</btrace-conf>\n"); | |
7101 | return 0; | |
7102 | } | |
9accd112 MM |
7103 | #endif /* HAVE_LINUX_BTRACE */ |
7104 | ||
7b669087 GB |
7105 | /* See nat/linux-nat.h. */ |
7106 | ||
7107 | ptid_t | |
7108 | current_lwp_ptid (void) | |
7109 | { | |
7110 | return ptid_of (current_thread); | |
7111 | } | |
7112 | ||
7f63b89b TBA |
7113 | const char * |
7114 | linux_process_target::thread_name (ptid_t thread) | |
7115 | { | |
7116 | return linux_proc_tid_get_name (thread); | |
7117 | } | |
7118 | ||
7119 | #if USE_THREAD_DB | |
7120 | bool | |
7121 | linux_process_target::thread_handle (ptid_t ptid, gdb_byte **handle, | |
7122 | int *handle_len) | |
7123 | { | |
7124 | return thread_db_thread_handle (ptid, handle, handle_len); | |
7125 | } | |
7126 | #endif | |
7127 | ||
276d4552 YQ |
7128 | /* Default implementation of linux_target_ops method "set_pc" for |
7129 | 32-bit pc register which is literally named "pc". */ | |
7130 | ||
7131 | void | |
7132 | linux_set_pc_32bit (struct regcache *regcache, CORE_ADDR pc) | |
7133 | { | |
7134 | uint32_t newpc = pc; | |
7135 | ||
7136 | supply_register_by_name (regcache, "pc", &newpc); | |
7137 | } | |
7138 | ||
7139 | /* Default implementation of linux_target_ops method "get_pc" for | |
7140 | 32-bit pc register which is literally named "pc". */ | |
7141 | ||
7142 | CORE_ADDR | |
7143 | linux_get_pc_32bit (struct regcache *regcache) | |
7144 | { | |
7145 | uint32_t pc; | |
7146 | ||
7147 | collect_register_by_name (regcache, "pc", &pc); | |
7148 | if (debug_threads) | |
7149 | debug_printf ("stop pc is 0x%" PRIx32 "\n", pc); | |
7150 | return pc; | |
7151 | } | |
7152 | ||
6f69e520 YQ |
7153 | /* Default implementation of linux_target_ops method "set_pc" for |
7154 | 64-bit pc register which is literally named "pc". */ | |
7155 | ||
7156 | void | |
7157 | linux_set_pc_64bit (struct regcache *regcache, CORE_ADDR pc) | |
7158 | { | |
7159 | uint64_t newpc = pc; | |
7160 | ||
7161 | supply_register_by_name (regcache, "pc", &newpc); | |
7162 | } | |
7163 | ||
7164 | /* Default implementation of linux_target_ops method "get_pc" for | |
7165 | 64-bit pc register which is literally named "pc". */ | |
7166 | ||
7167 | CORE_ADDR | |
7168 | linux_get_pc_64bit (struct regcache *regcache) | |
7169 | { | |
7170 | uint64_t pc; | |
7171 | ||
7172 | collect_register_by_name (regcache, "pc", &pc); | |
7173 | if (debug_threads) | |
7174 | debug_printf ("stop pc is 0x%" PRIx64 "\n", pc); | |
7175 | return pc; | |
7176 | } | |
7177 | ||
0570503d | 7178 | /* See linux-low.h. */ |
974c89e0 | 7179 | |
0570503d PFC |
7180 | int |
7181 | linux_get_auxv (int wordsize, CORE_ADDR match, CORE_ADDR *valp) | |
974c89e0 AH |
7182 | { |
7183 | gdb_byte *data = (gdb_byte *) alloca (2 * wordsize); | |
7184 | int offset = 0; | |
7185 | ||
7186 | gdb_assert (wordsize == 4 || wordsize == 8); | |
7187 | ||
52405d85 | 7188 | while (the_target->read_auxv (offset, data, 2 * wordsize) == 2 * wordsize) |
974c89e0 AH |
7189 | { |
7190 | if (wordsize == 4) | |
7191 | { | |
0570503d | 7192 | uint32_t *data_p = (uint32_t *) data; |
974c89e0 | 7193 | if (data_p[0] == match) |
0570503d PFC |
7194 | { |
7195 | *valp = data_p[1]; | |
7196 | return 1; | |
7197 | } | |
974c89e0 AH |
7198 | } |
7199 | else | |
7200 | { | |
0570503d | 7201 | uint64_t *data_p = (uint64_t *) data; |
974c89e0 | 7202 | if (data_p[0] == match) |
0570503d PFC |
7203 | { |
7204 | *valp = data_p[1]; | |
7205 | return 1; | |
7206 | } | |
974c89e0 AH |
7207 | } |
7208 | ||
7209 | offset += 2 * wordsize; | |
7210 | } | |
7211 | ||
7212 | return 0; | |
7213 | } | |
7214 | ||
7215 | /* See linux-low.h. */ | |
7216 | ||
7217 | CORE_ADDR | |
7218 | linux_get_hwcap (int wordsize) | |
7219 | { | |
0570503d PFC |
7220 | CORE_ADDR hwcap = 0; |
7221 | linux_get_auxv (wordsize, AT_HWCAP, &hwcap); | |
7222 | return hwcap; | |
974c89e0 AH |
7223 | } |
7224 | ||
7225 | /* See linux-low.h. */ | |
7226 | ||
7227 | CORE_ADDR | |
7228 | linux_get_hwcap2 (int wordsize) | |
7229 | { | |
0570503d PFC |
7230 | CORE_ADDR hwcap2 = 0; |
7231 | linux_get_auxv (wordsize, AT_HWCAP2, &hwcap2); | |
7232 | return hwcap2; | |
974c89e0 | 7233 | } |
6f69e520 | 7234 | |
3aee8918 PA |
7235 | #ifdef HAVE_LINUX_REGSETS |
7236 | void | |
7237 | initialize_regsets_info (struct regsets_info *info) | |
7238 | { | |
7239 | for (info->num_regsets = 0; | |
7240 | info->regsets[info->num_regsets].size >= 0; | |
7241 | info->num_regsets++) | |
7242 | ; | |
3aee8918 PA |
7243 | } |
7244 | #endif | |
7245 | ||
da6d8c04 DJ |
7246 | void |
7247 | initialize_low (void) | |
7248 | { | |
bd99dc85 | 7249 | struct sigaction sigchld_action; |
dd373349 | 7250 | |
bd99dc85 | 7251 | memset (&sigchld_action, 0, sizeof (sigchld_action)); |
ef0478f6 | 7252 | set_target_ops (the_linux_target); |
dd373349 | 7253 | |
aa7c7447 | 7254 | linux_ptrace_init_warnings (); |
1b919490 | 7255 | linux_proc_init_warnings (); |
bd99dc85 PA |
7256 | |
7257 | sigchld_action.sa_handler = sigchld_handler; | |
7258 | sigemptyset (&sigchld_action.sa_mask); | |
7259 | sigchld_action.sa_flags = SA_RESTART; | |
7260 | sigaction (SIGCHLD, &sigchld_action, NULL); | |
3aee8918 PA |
7261 | |
7262 | initialize_low_arch (); | |
89245bc0 DB |
7263 | |
7264 | linux_check_ptrace_features (); | |
da6d8c04 | 7265 | } |