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da6d8c04 | 1 | /* Low level interface to ptrace, for the remote server for GDB. |
4a94e368 | 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" |
cdc8e9b2 JB |
24 | #include "gdbsupport/event-loop.h" |
25 | #include "gdbsupport/event-pipe.h" | |
268a13a5 TT |
26 | #include "gdbsupport/rsp-low.h" |
27 | #include "gdbsupport/signals-state-save-restore.h" | |
96d7229d LM |
28 | #include "nat/linux-nat.h" |
29 | #include "nat/linux-waitpid.h" | |
268a13a5 | 30 | #include "gdbsupport/gdb_wait.h" |
5826e159 | 31 | #include "nat/gdb_ptrace.h" |
125f8a3d GB |
32 | #include "nat/linux-ptrace.h" |
33 | #include "nat/linux-procfs.h" | |
8cc73a39 | 34 | #include "nat/linux-personality.h" |
da6d8c04 DJ |
35 | #include <signal.h> |
36 | #include <sys/ioctl.h> | |
37 | #include <fcntl.h> | |
0a30fbc4 | 38 | #include <unistd.h> |
fd500816 | 39 | #include <sys/syscall.h> |
f9387fc3 | 40 | #include <sched.h> |
07e059b5 VP |
41 | #include <ctype.h> |
42 | #include <pwd.h> | |
43 | #include <sys/types.h> | |
44 | #include <dirent.h> | |
53ce3c39 | 45 | #include <sys/stat.h> |
efcbbd14 | 46 | #include <sys/vfs.h> |
1570b33e | 47 | #include <sys/uio.h> |
268a13a5 | 48 | #include "gdbsupport/filestuff.h" |
c144c7a0 | 49 | #include "tracepoint.h" |
276d4552 | 50 | #include <inttypes.h> |
268a13a5 | 51 | #include "gdbsupport/common-inferior.h" |
2090129c | 52 | #include "nat/fork-inferior.h" |
268a13a5 | 53 | #include "gdbsupport/environ.h" |
21987b9c | 54 | #include "gdbsupport/gdb-sigmask.h" |
268a13a5 | 55 | #include "gdbsupport/scoped_restore.h" |
957f3f49 DE |
56 | #ifndef ELFMAG0 |
57 | /* Don't include <linux/elf.h> here. If it got included by gdb_proc_service.h | |
58 | then ELFMAG0 will have been defined. If it didn't get included by | |
59 | gdb_proc_service.h then including it will likely introduce a duplicate | |
60 | definition of elf_fpregset_t. */ | |
61 | #include <elf.h> | |
62 | #endif | |
14d2069a | 63 | #include "nat/linux-namespaces.h" |
efcbbd14 | 64 | |
fd462a61 DJ |
65 | #ifndef O_LARGEFILE |
66 | #define O_LARGEFILE 0 | |
67 | #endif | |
1a981360 | 68 | |
69f4c9cc AH |
69 | #ifndef AT_HWCAP2 |
70 | #define AT_HWCAP2 26 | |
71 | #endif | |
72 | ||
db0dfaa0 LM |
73 | /* Some targets did not define these ptrace constants from the start, |
74 | so gdbserver defines them locally here. In the future, these may | |
75 | be removed after they are added to asm/ptrace.h. */ | |
76 | #if !(defined(PT_TEXT_ADDR) \ | |
77 | || defined(PT_DATA_ADDR) \ | |
78 | || defined(PT_TEXT_END_ADDR)) | |
79 | #if defined(__mcoldfire__) | |
80 | /* These are still undefined in 3.10 kernels. */ | |
81 | #define PT_TEXT_ADDR 49*4 | |
82 | #define PT_DATA_ADDR 50*4 | |
83 | #define PT_TEXT_END_ADDR 51*4 | |
db0dfaa0 LM |
84 | /* These are still undefined in 3.10 kernels. */ |
85 | #elif defined(__TMS320C6X__) | |
86 | #define PT_TEXT_ADDR (0x10000*4) | |
87 | #define PT_DATA_ADDR (0x10004*4) | |
88 | #define PT_TEXT_END_ADDR (0x10008*4) | |
89 | #endif | |
90 | #endif | |
91 | ||
5203ae1e TBA |
92 | #if (defined(__UCLIBC__) \ |
93 | && defined(HAS_NOMMU) \ | |
94 | && defined(PT_TEXT_ADDR) \ | |
95 | && defined(PT_DATA_ADDR) \ | |
96 | && defined(PT_TEXT_END_ADDR)) | |
97 | #define SUPPORTS_READ_OFFSETS | |
98 | #endif | |
99 | ||
9accd112 | 100 | #ifdef HAVE_LINUX_BTRACE |
125f8a3d | 101 | # include "nat/linux-btrace.h" |
268a13a5 | 102 | # include "gdbsupport/btrace-common.h" |
9accd112 MM |
103 | #endif |
104 | ||
8365dcf5 TJB |
105 | #ifndef HAVE_ELF32_AUXV_T |
106 | /* Copied from glibc's elf.h. */ | |
107 | typedef struct | |
108 | { | |
109 | uint32_t a_type; /* Entry type */ | |
110 | union | |
111 | { | |
112 | uint32_t a_val; /* Integer value */ | |
113 | /* We use to have pointer elements added here. We cannot do that, | |
114 | though, since it does not work when using 32-bit definitions | |
115 | on 64-bit platforms and vice versa. */ | |
116 | } a_un; | |
117 | } Elf32_auxv_t; | |
118 | #endif | |
119 | ||
120 | #ifndef HAVE_ELF64_AUXV_T | |
121 | /* Copied from glibc's elf.h. */ | |
122 | typedef struct | |
123 | { | |
124 | uint64_t a_type; /* Entry type */ | |
125 | union | |
126 | { | |
127 | uint64_t a_val; /* Integer value */ | |
128 | /* We use to have pointer elements added here. We cannot do that, | |
129 | though, since it does not work when using 32-bit definitions | |
130 | on 64-bit platforms and vice versa. */ | |
131 | } a_un; | |
132 | } Elf64_auxv_t; | |
133 | #endif | |
134 | ||
ded48a5e YQ |
135 | /* Does the current host support PTRACE_GETREGSET? */ |
136 | int have_ptrace_getregset = -1; | |
137 | ||
cff068da GB |
138 | /* LWP accessors. */ |
139 | ||
140 | /* See nat/linux-nat.h. */ | |
141 | ||
142 | ptid_t | |
143 | ptid_of_lwp (struct lwp_info *lwp) | |
144 | { | |
145 | return ptid_of (get_lwp_thread (lwp)); | |
146 | } | |
147 | ||
148 | /* See nat/linux-nat.h. */ | |
149 | ||
4b134ca1 GB |
150 | void |
151 | lwp_set_arch_private_info (struct lwp_info *lwp, | |
152 | struct arch_lwp_info *info) | |
153 | { | |
154 | lwp->arch_private = info; | |
155 | } | |
156 | ||
157 | /* See nat/linux-nat.h. */ | |
158 | ||
159 | struct arch_lwp_info * | |
160 | lwp_arch_private_info (struct lwp_info *lwp) | |
161 | { | |
162 | return lwp->arch_private; | |
163 | } | |
164 | ||
165 | /* See nat/linux-nat.h. */ | |
166 | ||
cff068da GB |
167 | int |
168 | lwp_is_stopped (struct lwp_info *lwp) | |
169 | { | |
170 | return lwp->stopped; | |
171 | } | |
172 | ||
173 | /* See nat/linux-nat.h. */ | |
174 | ||
175 | enum target_stop_reason | |
176 | lwp_stop_reason (struct lwp_info *lwp) | |
177 | { | |
178 | return lwp->stop_reason; | |
179 | } | |
180 | ||
0e00e962 AA |
181 | /* See nat/linux-nat.h. */ |
182 | ||
183 | int | |
184 | lwp_is_stepping (struct lwp_info *lwp) | |
185 | { | |
186 | return lwp->stepping; | |
187 | } | |
188 | ||
05044653 PA |
189 | /* A list of all unknown processes which receive stop signals. Some |
190 | other process will presumably claim each of these as forked | |
191 | children momentarily. */ | |
24a09b5f | 192 | |
05044653 PA |
193 | struct simple_pid_list |
194 | { | |
195 | /* The process ID. */ | |
196 | int pid; | |
197 | ||
198 | /* The status as reported by waitpid. */ | |
199 | int status; | |
200 | ||
201 | /* Next in chain. */ | |
202 | struct simple_pid_list *next; | |
203 | }; | |
05c309a8 | 204 | static struct simple_pid_list *stopped_pids; |
05044653 PA |
205 | |
206 | /* Trivial list manipulation functions to keep track of a list of new | |
207 | stopped processes. */ | |
208 | ||
209 | static void | |
210 | add_to_pid_list (struct simple_pid_list **listp, int pid, int status) | |
211 | { | |
8d749320 | 212 | struct simple_pid_list *new_pid = XNEW (struct simple_pid_list); |
05044653 PA |
213 | |
214 | new_pid->pid = pid; | |
215 | new_pid->status = status; | |
216 | new_pid->next = *listp; | |
217 | *listp = new_pid; | |
218 | } | |
219 | ||
220 | static int | |
221 | pull_pid_from_list (struct simple_pid_list **listp, int pid, int *statusp) | |
222 | { | |
223 | struct simple_pid_list **p; | |
224 | ||
225 | for (p = listp; *p != NULL; p = &(*p)->next) | |
226 | if ((*p)->pid == pid) | |
227 | { | |
228 | struct simple_pid_list *next = (*p)->next; | |
229 | ||
230 | *statusp = (*p)->status; | |
231 | xfree (*p); | |
232 | *p = next; | |
233 | return 1; | |
234 | } | |
235 | return 0; | |
236 | } | |
24a09b5f | 237 | |
bde24c0a PA |
238 | enum stopping_threads_kind |
239 | { | |
240 | /* Not stopping threads presently. */ | |
241 | NOT_STOPPING_THREADS, | |
242 | ||
243 | /* Stopping threads. */ | |
244 | STOPPING_THREADS, | |
245 | ||
246 | /* Stopping and suspending threads. */ | |
247 | STOPPING_AND_SUSPENDING_THREADS | |
248 | }; | |
249 | ||
250 | /* This is set while stop_all_lwps is in effect. */ | |
6bd434d6 | 251 | static stopping_threads_kind stopping_threads = NOT_STOPPING_THREADS; |
0d62e5e8 DJ |
252 | |
253 | /* FIXME make into a target method? */ | |
24a09b5f | 254 | int using_threads = 1; |
24a09b5f | 255 | |
fa593d66 PA |
256 | /* True if we're presently stabilizing threads (moving them out of |
257 | jump pads). */ | |
258 | static int stabilizing_threads; | |
259 | ||
f50bf8e5 | 260 | static void unsuspend_all_lwps (struct lwp_info *except); |
95954743 | 261 | static void mark_lwp_dead (struct lwp_info *lwp, int wstat); |
00db26fa | 262 | static int lwp_is_marked_dead (struct lwp_info *lwp); |
d50171e4 | 263 | static int kill_lwp (unsigned long lwpid, int signo); |
863d01bd | 264 | static void enqueue_pending_signal (struct lwp_info *lwp, int signal, siginfo_t *info); |
ece66d65 | 265 | static int linux_low_ptrace_options (int attached); |
ced2dffb | 266 | static int check_ptrace_stopped_lwp_gone (struct lwp_info *lp); |
d50171e4 | 267 | |
582511be PA |
268 | /* When the event-loop is doing a step-over, this points at the thread |
269 | being stepped. */ | |
6bd434d6 | 270 | static ptid_t step_over_bkpt; |
582511be | 271 | |
bf9ae9d8 TBA |
272 | bool |
273 | linux_process_target::low_supports_breakpoints () | |
274 | { | |
275 | return false; | |
276 | } | |
d50171e4 | 277 | |
bf9ae9d8 TBA |
278 | CORE_ADDR |
279 | linux_process_target::low_get_pc (regcache *regcache) | |
280 | { | |
281 | return 0; | |
282 | } | |
283 | ||
284 | void | |
285 | linux_process_target::low_set_pc (regcache *regcache, CORE_ADDR newpc) | |
d50171e4 | 286 | { |
bf9ae9d8 | 287 | gdb_assert_not_reached ("linux target op low_set_pc is not implemented"); |
d50171e4 | 288 | } |
0d62e5e8 | 289 | |
7582c77c TBA |
290 | std::vector<CORE_ADDR> |
291 | linux_process_target::low_get_next_pcs (regcache *regcache) | |
292 | { | |
293 | gdb_assert_not_reached ("linux target op low_get_next_pcs is not " | |
294 | "implemented"); | |
295 | } | |
296 | ||
d4807ea2 TBA |
297 | int |
298 | linux_process_target::low_decr_pc_after_break () | |
299 | { | |
300 | return 0; | |
301 | } | |
302 | ||
c2d6af84 PA |
303 | /* True if LWP is stopped in its stepping range. */ |
304 | ||
305 | static int | |
306 | lwp_in_step_range (struct lwp_info *lwp) | |
307 | { | |
308 | CORE_ADDR pc = lwp->stop_pc; | |
309 | ||
310 | return (pc >= lwp->step_range_start && pc < lwp->step_range_end); | |
311 | } | |
312 | ||
cdc8e9b2 JB |
313 | /* The event pipe registered as a waitable file in the event loop. */ |
314 | static event_pipe linux_event_pipe; | |
bd99dc85 PA |
315 | |
316 | /* True if we're currently in async mode. */ | |
cdc8e9b2 | 317 | #define target_is_async_p() (linux_event_pipe.is_open ()) |
bd99dc85 | 318 | |
02fc4de7 | 319 | static void send_sigstop (struct lwp_info *lwp); |
bd99dc85 | 320 | |
d0722149 DE |
321 | /* Return non-zero if HEADER is a 64-bit ELF file. */ |
322 | ||
323 | static int | |
214d508e | 324 | elf_64_header_p (const Elf64_Ehdr *header, unsigned int *machine) |
d0722149 | 325 | { |
214d508e L |
326 | if (header->e_ident[EI_MAG0] == ELFMAG0 |
327 | && header->e_ident[EI_MAG1] == ELFMAG1 | |
328 | && header->e_ident[EI_MAG2] == ELFMAG2 | |
329 | && header->e_ident[EI_MAG3] == ELFMAG3) | |
330 | { | |
331 | *machine = header->e_machine; | |
332 | return header->e_ident[EI_CLASS] == ELFCLASS64; | |
333 | ||
334 | } | |
335 | *machine = EM_NONE; | |
336 | return -1; | |
d0722149 DE |
337 | } |
338 | ||
339 | /* Return non-zero if FILE is a 64-bit ELF file, | |
340 | zero if the file is not a 64-bit ELF file, | |
341 | and -1 if the file is not accessible or doesn't exist. */ | |
342 | ||
be07f1a2 | 343 | static int |
214d508e | 344 | elf_64_file_p (const char *file, unsigned int *machine) |
d0722149 | 345 | { |
957f3f49 | 346 | Elf64_Ehdr header; |
d0722149 DE |
347 | int fd; |
348 | ||
349 | fd = open (file, O_RDONLY); | |
350 | if (fd < 0) | |
351 | return -1; | |
352 | ||
353 | if (read (fd, &header, sizeof (header)) != sizeof (header)) | |
354 | { | |
355 | close (fd); | |
356 | return 0; | |
357 | } | |
358 | close (fd); | |
359 | ||
214d508e | 360 | return elf_64_header_p (&header, machine); |
d0722149 DE |
361 | } |
362 | ||
be07f1a2 PA |
363 | /* Accepts an integer PID; Returns true if the executable PID is |
364 | running is a 64-bit ELF file.. */ | |
365 | ||
366 | int | |
214d508e | 367 | linux_pid_exe_is_elf_64_file (int pid, unsigned int *machine) |
be07f1a2 | 368 | { |
d8d2a3ee | 369 | char file[PATH_MAX]; |
be07f1a2 PA |
370 | |
371 | sprintf (file, "/proc/%d/exe", pid); | |
214d508e | 372 | return elf_64_file_p (file, machine); |
be07f1a2 PA |
373 | } |
374 | ||
fd000fb3 TBA |
375 | void |
376 | linux_process_target::delete_lwp (lwp_info *lwp) | |
bd99dc85 | 377 | { |
fa96cb38 PA |
378 | struct thread_info *thr = get_lwp_thread (lwp); |
379 | ||
c058728c | 380 | threads_debug_printf ("deleting %ld", lwpid_of (thr)); |
fa96cb38 PA |
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 | 432 | { |
24583e45 TBA |
433 | scoped_restore_current_thread restore_thread; |
434 | switch_to_thread (thread); | |
94585166 | 435 | |
797bcff5 | 436 | low_arch_setup (); |
94585166 DB |
437 | } |
438 | ||
d16f3f6c TBA |
439 | int |
440 | linux_process_target::handle_extended_wait (lwp_info **orig_event_lwp, | |
441 | int wstat) | |
24a09b5f | 442 | { |
c12a5089 | 443 | client_state &cs = get_client_state (); |
94585166 | 444 | struct lwp_info *event_lwp = *orig_event_lwp; |
89a5711c | 445 | int event = linux_ptrace_get_extended_event (wstat); |
de0d863e | 446 | struct thread_info *event_thr = get_lwp_thread (event_lwp); |
54a0b537 | 447 | struct lwp_info *new_lwp; |
24a09b5f | 448 | |
183be222 | 449 | gdb_assert (event_lwp->waitstatus.kind () == TARGET_WAITKIND_IGNORE); |
65706a29 | 450 | |
82075af2 JS |
451 | /* All extended events we currently use are mid-syscall. Only |
452 | PTRACE_EVENT_STOP is delivered more like a signal-stop, but | |
453 | you have to be using PTRACE_SEIZE to get that. */ | |
454 | event_lwp->syscall_state = TARGET_WAITKIND_SYSCALL_ENTRY; | |
455 | ||
c269dbdb DB |
456 | if ((event == PTRACE_EVENT_FORK) || (event == PTRACE_EVENT_VFORK) |
457 | || (event == PTRACE_EVENT_CLONE)) | |
24a09b5f | 458 | { |
95954743 | 459 | ptid_t ptid; |
24a09b5f | 460 | unsigned long new_pid; |
05044653 | 461 | int ret, status; |
24a09b5f | 462 | |
de0d863e | 463 | /* Get the pid of the new lwp. */ |
d86d4aaf | 464 | ptrace (PTRACE_GETEVENTMSG, lwpid_of (event_thr), (PTRACE_TYPE_ARG3) 0, |
56f7af9c | 465 | &new_pid); |
24a09b5f DJ |
466 | |
467 | /* If we haven't already seen the new PID stop, wait for it now. */ | |
05044653 | 468 | if (!pull_pid_from_list (&stopped_pids, new_pid, &status)) |
24a09b5f DJ |
469 | { |
470 | /* The new child has a pending SIGSTOP. We can't affect it until it | |
471 | hits the SIGSTOP, but we're already attached. */ | |
472 | ||
97438e3f | 473 | ret = my_waitpid (new_pid, &status, __WALL); |
24a09b5f DJ |
474 | |
475 | if (ret == -1) | |
476 | perror_with_name ("waiting for new child"); | |
477 | else if (ret != new_pid) | |
478 | warning ("wait returned unexpected PID %d", ret); | |
da5898ce | 479 | else if (!WIFSTOPPED (status)) |
24a09b5f DJ |
480 | warning ("wait returned unexpected status 0x%x", status); |
481 | } | |
482 | ||
c269dbdb | 483 | if (event == PTRACE_EVENT_FORK || event == PTRACE_EVENT_VFORK) |
de0d863e DB |
484 | { |
485 | struct process_info *parent_proc; | |
486 | struct process_info *child_proc; | |
487 | struct lwp_info *child_lwp; | |
bfacd19d | 488 | struct thread_info *child_thr; |
de0d863e | 489 | |
184ea2f7 | 490 | ptid = ptid_t (new_pid, new_pid); |
de0d863e | 491 | |
c058728c SM |
492 | threads_debug_printf ("Got fork event from LWP %ld, " |
493 | "new child is %d", | |
494 | ptid_of (event_thr).lwp (), | |
495 | ptid.pid ()); | |
de0d863e DB |
496 | |
497 | /* Add the new process to the tables and clone the breakpoint | |
498 | lists of the parent. We need to do this even if the new process | |
499 | will be detached, since we will need the process object and the | |
500 | breakpoints to remove any breakpoints from memory when we | |
501 | detach, and the client side will access registers. */ | |
fd000fb3 | 502 | child_proc = add_linux_process (new_pid, 0); |
de0d863e DB |
503 | gdb_assert (child_proc != NULL); |
504 | child_lwp = add_lwp (ptid); | |
505 | gdb_assert (child_lwp != NULL); | |
506 | child_lwp->stopped = 1; | |
bfacd19d DB |
507 | child_lwp->must_set_ptrace_flags = 1; |
508 | child_lwp->status_pending_p = 0; | |
509 | child_thr = get_lwp_thread (child_lwp); | |
510 | child_thr->last_resume_kind = resume_stop; | |
183be222 | 511 | child_thr->last_status.set_stopped (GDB_SIGNAL_0); |
998d452a | 512 | |
863d01bd | 513 | /* If we're suspending all threads, leave this one suspended |
0f8288ae YQ |
514 | too. If the fork/clone parent is stepping over a breakpoint, |
515 | all other threads have been suspended already. Leave the | |
516 | child suspended too. */ | |
517 | if (stopping_threads == STOPPING_AND_SUSPENDING_THREADS | |
518 | || event_lwp->bp_reinsert != 0) | |
863d01bd | 519 | { |
c058728c | 520 | threads_debug_printf ("leaving child suspended"); |
863d01bd PA |
521 | child_lwp->suspended = 1; |
522 | } | |
523 | ||
de0d863e DB |
524 | parent_proc = get_thread_process (event_thr); |
525 | child_proc->attached = parent_proc->attached; | |
2e7b624b YQ |
526 | |
527 | if (event_lwp->bp_reinsert != 0 | |
7582c77c | 528 | && supports_software_single_step () |
2e7b624b YQ |
529 | && event == PTRACE_EVENT_VFORK) |
530 | { | |
3b9a79ef YQ |
531 | /* If we leave single-step breakpoints there, child will |
532 | hit it, so uninsert single-step breakpoints from parent | |
2e7b624b YQ |
533 | (and child). Once vfork child is done, reinsert |
534 | them back to parent. */ | |
3b9a79ef | 535 | uninsert_single_step_breakpoints (event_thr); |
2e7b624b YQ |
536 | } |
537 | ||
63c40ec7 | 538 | clone_all_breakpoints (child_thr, event_thr); |
de0d863e | 539 | |
51a948fd AB |
540 | target_desc_up tdesc = allocate_target_description (); |
541 | copy_target_description (tdesc.get (), parent_proc->tdesc); | |
542 | child_proc->tdesc = tdesc.release (); | |
de0d863e | 543 | |
3a8a0396 | 544 | /* Clone arch-specific process data. */ |
fd000fb3 | 545 | low_new_fork (parent_proc, child_proc); |
3a8a0396 | 546 | |
de0d863e | 547 | /* Save fork info in the parent thread. */ |
c269dbdb | 548 | if (event == PTRACE_EVENT_FORK) |
183be222 | 549 | event_lwp->waitstatus.set_forked (ptid); |
c269dbdb | 550 | else if (event == PTRACE_EVENT_VFORK) |
183be222 | 551 | event_lwp->waitstatus.set_vforked (ptid); |
c269dbdb | 552 | |
de0d863e DB |
553 | /* The status_pending field contains bits denoting the |
554 | extended event, so when the pending event is handled, | |
555 | the handler will look at lwp->waitstatus. */ | |
556 | event_lwp->status_pending_p = 1; | |
557 | event_lwp->status_pending = wstat; | |
558 | ||
5a04c4cf PA |
559 | /* Link the threads until the parent event is passed on to |
560 | higher layers. */ | |
561 | event_lwp->fork_relative = child_lwp; | |
562 | child_lwp->fork_relative = event_lwp; | |
563 | ||
3b9a79ef YQ |
564 | /* If the parent thread is doing step-over with single-step |
565 | breakpoints, the list of single-step breakpoints are cloned | |
2e7b624b YQ |
566 | from the parent's. Remove them from the child process. |
567 | In case of vfork, we'll reinsert them back once vforked | |
568 | child is done. */ | |
8a81c5d7 | 569 | if (event_lwp->bp_reinsert != 0 |
7582c77c | 570 | && supports_software_single_step ()) |
8a81c5d7 | 571 | { |
8a81c5d7 YQ |
572 | /* The child process is forked and stopped, so it is safe |
573 | to access its memory without stopping all other threads | |
574 | from other processes. */ | |
3b9a79ef | 575 | delete_single_step_breakpoints (child_thr); |
8a81c5d7 | 576 | |
3b9a79ef YQ |
577 | gdb_assert (has_single_step_breakpoints (event_thr)); |
578 | gdb_assert (!has_single_step_breakpoints (child_thr)); | |
8a81c5d7 YQ |
579 | } |
580 | ||
de0d863e DB |
581 | /* Report the event. */ |
582 | return 0; | |
583 | } | |
584 | ||
c058728c SM |
585 | threads_debug_printf |
586 | ("Got clone event from LWP %ld, new child is LWP %ld", | |
587 | lwpid_of (event_thr), new_pid); | |
fa96cb38 | 588 | |
184ea2f7 | 589 | ptid = ptid_t (pid_of (event_thr), new_pid); |
b3312d80 | 590 | new_lwp = add_lwp (ptid); |
24a09b5f | 591 | |
e27d73f6 | 592 | /* Either we're going to immediately resume the new thread |
df95181f | 593 | or leave it stopped. resume_one_lwp is a nop if it |
e27d73f6 | 594 | thinks the thread is currently running, so set this first |
df95181f | 595 | before calling resume_one_lwp. */ |
e27d73f6 DE |
596 | new_lwp->stopped = 1; |
597 | ||
0f8288ae YQ |
598 | /* If we're suspending all threads, leave this one suspended |
599 | too. If the fork/clone parent is stepping over a breakpoint, | |
600 | all other threads have been suspended already. Leave the | |
601 | child suspended too. */ | |
602 | if (stopping_threads == STOPPING_AND_SUSPENDING_THREADS | |
603 | || event_lwp->bp_reinsert != 0) | |
bde24c0a PA |
604 | new_lwp->suspended = 1; |
605 | ||
da5898ce DJ |
606 | /* Normally we will get the pending SIGSTOP. But in some cases |
607 | we might get another signal delivered to the group first. | |
f21cc1a2 | 608 | If we do get another signal, be sure not to lose it. */ |
20ba1ce6 | 609 | if (WSTOPSIG (status) != SIGSTOP) |
da5898ce | 610 | { |
54a0b537 | 611 | new_lwp->stop_expected = 1; |
20ba1ce6 PA |
612 | new_lwp->status_pending_p = 1; |
613 | new_lwp->status_pending = status; | |
da5898ce | 614 | } |
c12a5089 | 615 | else if (cs.report_thread_events) |
65706a29 | 616 | { |
183be222 | 617 | new_lwp->waitstatus.set_thread_created (); |
65706a29 PA |
618 | new_lwp->status_pending_p = 1; |
619 | new_lwp->status_pending = status; | |
620 | } | |
de0d863e | 621 | |
a0aad537 | 622 | #ifdef USE_THREAD_DB |
94c207e0 | 623 | thread_db_notice_clone (event_thr, ptid); |
a0aad537 | 624 | #endif |
86299109 | 625 | |
de0d863e DB |
626 | /* Don't report the event. */ |
627 | return 1; | |
24a09b5f | 628 | } |
c269dbdb DB |
629 | else if (event == PTRACE_EVENT_VFORK_DONE) |
630 | { | |
183be222 | 631 | event_lwp->waitstatus.set_vfork_done (); |
c269dbdb | 632 | |
7582c77c | 633 | if (event_lwp->bp_reinsert != 0 && supports_software_single_step ()) |
2e7b624b | 634 | { |
3b9a79ef | 635 | reinsert_single_step_breakpoints (event_thr); |
2e7b624b | 636 | |
3b9a79ef | 637 | gdb_assert (has_single_step_breakpoints (event_thr)); |
2e7b624b YQ |
638 | } |
639 | ||
c269dbdb DB |
640 | /* Report the event. */ |
641 | return 0; | |
642 | } | |
c12a5089 | 643 | else if (event == PTRACE_EVENT_EXEC && cs.report_exec_events) |
94585166 DB |
644 | { |
645 | struct process_info *proc; | |
f27866ba | 646 | std::vector<int> syscalls_to_catch; |
94585166 DB |
647 | ptid_t event_ptid; |
648 | pid_t event_pid; | |
649 | ||
c058728c SM |
650 | threads_debug_printf ("Got exec event from LWP %ld", |
651 | lwpid_of (event_thr)); | |
94585166 DB |
652 | |
653 | /* Get the event ptid. */ | |
654 | event_ptid = ptid_of (event_thr); | |
e99b03dc | 655 | event_pid = event_ptid.pid (); |
94585166 | 656 | |
82075af2 | 657 | /* Save the syscall list from the execing process. */ |
94585166 | 658 | proc = get_thread_process (event_thr); |
f27866ba | 659 | syscalls_to_catch = std::move (proc->syscalls_to_catch); |
82075af2 JS |
660 | |
661 | /* Delete the execing process and all its threads. */ | |
d16f3f6c | 662 | mourn (proc); |
24583e45 | 663 | switch_to_thread (nullptr); |
94585166 DB |
664 | |
665 | /* Create a new process/lwp/thread. */ | |
fd000fb3 | 666 | proc = add_linux_process (event_pid, 0); |
94585166 DB |
667 | event_lwp = add_lwp (event_ptid); |
668 | event_thr = get_lwp_thread (event_lwp); | |
669 | gdb_assert (current_thread == event_thr); | |
797bcff5 | 670 | arch_setup_thread (event_thr); |
94585166 DB |
671 | |
672 | /* Set the event status. */ | |
183be222 SM |
673 | event_lwp->waitstatus.set_execd |
674 | (make_unique_xstrdup | |
675 | (linux_proc_pid_to_exec_file (lwpid_of (event_thr)))); | |
94585166 DB |
676 | |
677 | /* Mark the exec status as pending. */ | |
678 | event_lwp->stopped = 1; | |
679 | event_lwp->status_pending_p = 1; | |
680 | event_lwp->status_pending = wstat; | |
681 | event_thr->last_resume_kind = resume_continue; | |
183be222 | 682 | event_thr->last_status.set_ignore (); |
94585166 | 683 | |
82075af2 JS |
684 | /* Update syscall state in the new lwp, effectively mid-syscall too. */ |
685 | event_lwp->syscall_state = TARGET_WAITKIND_SYSCALL_ENTRY; | |
686 | ||
687 | /* Restore the list to catch. Don't rely on the client, which is free | |
688 | to avoid sending a new list when the architecture doesn't change. | |
689 | Also, for ANY_SYSCALL, the architecture doesn't really matter. */ | |
f27866ba | 690 | proc->syscalls_to_catch = std::move (syscalls_to_catch); |
82075af2 | 691 | |
94585166 DB |
692 | /* Report the event. */ |
693 | *orig_event_lwp = event_lwp; | |
694 | return 0; | |
695 | } | |
de0d863e DB |
696 | |
697 | internal_error (__FILE__, __LINE__, _("unknown ptrace event %d"), event); | |
24a09b5f DJ |
698 | } |
699 | ||
df95181f TBA |
700 | CORE_ADDR |
701 | linux_process_target::get_pc (lwp_info *lwp) | |
d50171e4 | 702 | { |
d50171e4 PA |
703 | struct regcache *regcache; |
704 | CORE_ADDR pc; | |
705 | ||
bf9ae9d8 | 706 | if (!low_supports_breakpoints ()) |
d50171e4 PA |
707 | return 0; |
708 | ||
24583e45 TBA |
709 | scoped_restore_current_thread restore_thread; |
710 | switch_to_thread (get_lwp_thread (lwp)); | |
d50171e4 | 711 | |
0bfdf32f | 712 | regcache = get_thread_regcache (current_thread, 1); |
bf9ae9d8 | 713 | pc = low_get_pc (regcache); |
d50171e4 | 714 | |
c058728c | 715 | threads_debug_printf ("pc is 0x%lx", (long) pc); |
d50171e4 | 716 | |
d50171e4 PA |
717 | return pc; |
718 | } | |
719 | ||
9eedd27d TBA |
720 | void |
721 | linux_process_target::get_syscall_trapinfo (lwp_info *lwp, int *sysno) | |
82075af2 | 722 | { |
82075af2 JS |
723 | struct regcache *regcache; |
724 | ||
24583e45 TBA |
725 | scoped_restore_current_thread restore_thread; |
726 | switch_to_thread (get_lwp_thread (lwp)); | |
82075af2 JS |
727 | |
728 | regcache = get_thread_regcache (current_thread, 1); | |
9eedd27d | 729 | low_get_syscall_trapinfo (regcache, sysno); |
82075af2 | 730 | |
c058728c | 731 | threads_debug_printf ("get_syscall_trapinfo sysno %d", *sysno); |
82075af2 JS |
732 | } |
733 | ||
9eedd27d TBA |
734 | void |
735 | linux_process_target::low_get_syscall_trapinfo (regcache *regcache, int *sysno) | |
736 | { | |
737 | /* By default, report an unknown system call number. */ | |
738 | *sysno = UNKNOWN_SYSCALL; | |
739 | } | |
740 | ||
df95181f TBA |
741 | bool |
742 | linux_process_target::save_stop_reason (lwp_info *lwp) | |
0d62e5e8 | 743 | { |
582511be PA |
744 | CORE_ADDR pc; |
745 | CORE_ADDR sw_breakpoint_pc; | |
3e572f71 PA |
746 | #if USE_SIGTRAP_SIGINFO |
747 | siginfo_t siginfo; | |
748 | #endif | |
d50171e4 | 749 | |
bf9ae9d8 | 750 | if (!low_supports_breakpoints ()) |
df95181f | 751 | return false; |
0d62e5e8 | 752 | |
582511be | 753 | pc = get_pc (lwp); |
d4807ea2 | 754 | sw_breakpoint_pc = pc - low_decr_pc_after_break (); |
d50171e4 | 755 | |
582511be | 756 | /* breakpoint_at reads from the current thread. */ |
24583e45 TBA |
757 | scoped_restore_current_thread restore_thread; |
758 | switch_to_thread (get_lwp_thread (lwp)); | |
47c0c975 | 759 | |
3e572f71 PA |
760 | #if USE_SIGTRAP_SIGINFO |
761 | if (ptrace (PTRACE_GETSIGINFO, lwpid_of (current_thread), | |
762 | (PTRACE_TYPE_ARG3) 0, &siginfo) == 0) | |
763 | { | |
764 | if (siginfo.si_signo == SIGTRAP) | |
765 | { | |
e7ad2f14 PA |
766 | if (GDB_ARCH_IS_TRAP_BRKPT (siginfo.si_code) |
767 | && GDB_ARCH_IS_TRAP_HWBKPT (siginfo.si_code)) | |
3e572f71 | 768 | { |
e7ad2f14 PA |
769 | /* The si_code is ambiguous on this arch -- check debug |
770 | registers. */ | |
771 | if (!check_stopped_by_watchpoint (lwp)) | |
772 | lwp->stop_reason = TARGET_STOPPED_BY_SW_BREAKPOINT; | |
773 | } | |
774 | else if (GDB_ARCH_IS_TRAP_BRKPT (siginfo.si_code)) | |
775 | { | |
776 | /* If we determine the LWP stopped for a SW breakpoint, | |
777 | trust it. Particularly don't check watchpoint | |
778 | registers, because at least on s390, we'd find | |
779 | stopped-by-watchpoint as long as there's a watchpoint | |
780 | set. */ | |
3e572f71 | 781 | lwp->stop_reason = TARGET_STOPPED_BY_SW_BREAKPOINT; |
3e572f71 | 782 | } |
e7ad2f14 | 783 | else if (GDB_ARCH_IS_TRAP_HWBKPT (siginfo.si_code)) |
3e572f71 | 784 | { |
e7ad2f14 PA |
785 | /* This can indicate either a hardware breakpoint or |
786 | hardware watchpoint. Check debug registers. */ | |
787 | if (!check_stopped_by_watchpoint (lwp)) | |
788 | lwp->stop_reason = TARGET_STOPPED_BY_HW_BREAKPOINT; | |
3e572f71 | 789 | } |
2bf6fb9d PA |
790 | else if (siginfo.si_code == TRAP_TRACE) |
791 | { | |
e7ad2f14 PA |
792 | /* We may have single stepped an instruction that |
793 | triggered a watchpoint. In that case, on some | |
794 | architectures (such as x86), instead of TRAP_HWBKPT, | |
795 | si_code indicates TRAP_TRACE, and we need to check | |
796 | the debug registers separately. */ | |
797 | if (!check_stopped_by_watchpoint (lwp)) | |
798 | lwp->stop_reason = TARGET_STOPPED_BY_SINGLE_STEP; | |
2bf6fb9d | 799 | } |
3e572f71 PA |
800 | } |
801 | } | |
802 | #else | |
582511be PA |
803 | /* We may have just stepped a breakpoint instruction. E.g., in |
804 | non-stop mode, GDB first tells the thread A to step a range, and | |
805 | then the user inserts a breakpoint inside the range. In that | |
8090aef2 PA |
806 | case we need to report the breakpoint PC. */ |
807 | if ((!lwp->stepping || lwp->stop_pc == sw_breakpoint_pc) | |
d7146cda | 808 | && low_breakpoint_at (sw_breakpoint_pc)) |
e7ad2f14 PA |
809 | lwp->stop_reason = TARGET_STOPPED_BY_SW_BREAKPOINT; |
810 | ||
811 | if (hardware_breakpoint_inserted_here (pc)) | |
812 | lwp->stop_reason = TARGET_STOPPED_BY_HW_BREAKPOINT; | |
813 | ||
814 | if (lwp->stop_reason == TARGET_STOPPED_BY_NO_REASON) | |
815 | check_stopped_by_watchpoint (lwp); | |
816 | #endif | |
817 | ||
818 | if (lwp->stop_reason == TARGET_STOPPED_BY_SW_BREAKPOINT) | |
582511be | 819 | { |
c058728c SM |
820 | threads_debug_printf |
821 | ("%s stopped by software breakpoint", | |
822 | target_pid_to_str (ptid_of (get_lwp_thread (lwp))).c_str ()); | |
582511be PA |
823 | |
824 | /* Back up the PC if necessary. */ | |
825 | if (pc != sw_breakpoint_pc) | |
e7ad2f14 | 826 | { |
582511be PA |
827 | struct regcache *regcache |
828 | = get_thread_regcache (current_thread, 1); | |
bf9ae9d8 | 829 | low_set_pc (regcache, sw_breakpoint_pc); |
582511be PA |
830 | } |
831 | ||
e7ad2f14 PA |
832 | /* Update this so we record the correct stop PC below. */ |
833 | pc = sw_breakpoint_pc; | |
582511be | 834 | } |
e7ad2f14 | 835 | else if (lwp->stop_reason == TARGET_STOPPED_BY_HW_BREAKPOINT) |
c058728c SM |
836 | threads_debug_printf |
837 | ("%s stopped by hardware breakpoint", | |
838 | target_pid_to_str (ptid_of (get_lwp_thread (lwp))).c_str ()); | |
e7ad2f14 | 839 | else if (lwp->stop_reason == TARGET_STOPPED_BY_WATCHPOINT) |
c058728c SM |
840 | threads_debug_printf |
841 | ("%s stopped by hardware watchpoint", | |
842 | target_pid_to_str (ptid_of (get_lwp_thread (lwp))).c_str ()); | |
e7ad2f14 | 843 | else if (lwp->stop_reason == TARGET_STOPPED_BY_SINGLE_STEP) |
c058728c SM |
844 | threads_debug_printf |
845 | ("%s stopped by trace", | |
846 | target_pid_to_str (ptid_of (get_lwp_thread (lwp))).c_str ()); | |
e7ad2f14 PA |
847 | |
848 | lwp->stop_pc = pc; | |
df95181f | 849 | return true; |
0d62e5e8 | 850 | } |
ce3a066d | 851 | |
fd000fb3 TBA |
852 | lwp_info * |
853 | linux_process_target::add_lwp (ptid_t ptid) | |
611cb4a5 | 854 | { |
c360a473 | 855 | lwp_info *lwp = new lwp_info; |
0d62e5e8 | 856 | |
754e3168 AH |
857 | lwp->thread = add_thread (ptid, lwp); |
858 | ||
fd000fb3 | 859 | low_new_thread (lwp); |
aa5ca48f | 860 | |
54a0b537 | 861 | return lwp; |
0d62e5e8 | 862 | } |
611cb4a5 | 863 | |
fd000fb3 TBA |
864 | void |
865 | linux_process_target::low_new_thread (lwp_info *info) | |
866 | { | |
867 | /* Nop. */ | |
868 | } | |
869 | ||
2090129c SDJ |
870 | /* Callback to be used when calling fork_inferior, responsible for |
871 | actually initiating the tracing of the inferior. */ | |
872 | ||
873 | static void | |
874 | linux_ptrace_fun () | |
875 | { | |
876 | if (ptrace (PTRACE_TRACEME, 0, (PTRACE_TYPE_ARG3) 0, | |
877 | (PTRACE_TYPE_ARG4) 0) < 0) | |
50fa3001 | 878 | trace_start_error_with_name ("ptrace"); |
2090129c SDJ |
879 | |
880 | if (setpgid (0, 0) < 0) | |
881 | trace_start_error_with_name ("setpgid"); | |
882 | ||
883 | /* If GDBserver is connected to gdb via stdio, redirect the inferior's | |
884 | stdout to stderr so that inferior i/o doesn't corrupt the connection. | |
885 | Also, redirect stdin to /dev/null. */ | |
886 | if (remote_connection_is_stdio ()) | |
887 | { | |
888 | if (close (0) < 0) | |
889 | trace_start_error_with_name ("close"); | |
890 | if (open ("/dev/null", O_RDONLY) < 0) | |
891 | trace_start_error_with_name ("open"); | |
892 | if (dup2 (2, 1) < 0) | |
893 | trace_start_error_with_name ("dup2"); | |
894 | if (write (2, "stdin/stdout redirected\n", | |
895 | sizeof ("stdin/stdout redirected\n") - 1) < 0) | |
896 | { | |
897 | /* Errors ignored. */; | |
898 | } | |
899 | } | |
900 | } | |
901 | ||
da6d8c04 | 902 | /* Start an inferior process and returns its pid. |
2090129c SDJ |
903 | PROGRAM is the name of the program to be started, and PROGRAM_ARGS |
904 | are its arguments. */ | |
da6d8c04 | 905 | |
15295543 TBA |
906 | int |
907 | linux_process_target::create_inferior (const char *program, | |
908 | const std::vector<char *> &program_args) | |
da6d8c04 | 909 | { |
c12a5089 | 910 | client_state &cs = get_client_state (); |
a6dbe5df | 911 | struct lwp_info *new_lwp; |
da6d8c04 | 912 | int pid; |
95954743 | 913 | ptid_t ptid; |
03583c20 | 914 | |
41272101 TT |
915 | { |
916 | maybe_disable_address_space_randomization restore_personality | |
c12a5089 | 917 | (cs.disable_randomization); |
bea571eb | 918 | std::string str_program_args = construct_inferior_arguments (program_args); |
41272101 TT |
919 | |
920 | pid = fork_inferior (program, | |
921 | str_program_args.c_str (), | |
922 | get_environ ()->envp (), linux_ptrace_fun, | |
923 | NULL, NULL, NULL, NULL); | |
924 | } | |
03583c20 | 925 | |
fd000fb3 | 926 | add_linux_process (pid, 0); |
95954743 | 927 | |
184ea2f7 | 928 | ptid = ptid_t (pid, pid); |
95954743 | 929 | new_lwp = add_lwp (ptid); |
a6dbe5df | 930 | new_lwp->must_set_ptrace_flags = 1; |
611cb4a5 | 931 | |
2090129c SDJ |
932 | post_fork_inferior (pid, program); |
933 | ||
a9fa9f7d | 934 | return pid; |
da6d8c04 DJ |
935 | } |
936 | ||
ece66d65 JS |
937 | /* Implement the post_create_inferior target_ops method. */ |
938 | ||
6dee9afb TBA |
939 | void |
940 | linux_process_target::post_create_inferior () | |
ece66d65 JS |
941 | { |
942 | struct lwp_info *lwp = get_thread_lwp (current_thread); | |
943 | ||
797bcff5 | 944 | low_arch_setup (); |
ece66d65 JS |
945 | |
946 | if (lwp->must_set_ptrace_flags) | |
947 | { | |
948 | struct process_info *proc = current_process (); | |
949 | int options = linux_low_ptrace_options (proc->attached); | |
950 | ||
951 | linux_enable_event_reporting (lwpid_of (current_thread), options); | |
952 | lwp->must_set_ptrace_flags = 0; | |
953 | } | |
954 | } | |
955 | ||
7ae1a6a6 | 956 | int |
fd000fb3 | 957 | linux_process_target::attach_lwp (ptid_t ptid) |
da6d8c04 | 958 | { |
54a0b537 | 959 | struct lwp_info *new_lwp; |
e38504b3 | 960 | int lwpid = ptid.lwp (); |
611cb4a5 | 961 | |
b8e1b30e | 962 | if (ptrace (PTRACE_ATTACH, lwpid, (PTRACE_TYPE_ARG3) 0, (PTRACE_TYPE_ARG4) 0) |
56f7af9c | 963 | != 0) |
7ae1a6a6 | 964 | return errno; |
24a09b5f | 965 | |
b3312d80 | 966 | new_lwp = add_lwp (ptid); |
0d62e5e8 | 967 | |
a6dbe5df PA |
968 | /* We need to wait for SIGSTOP before being able to make the next |
969 | ptrace call on this LWP. */ | |
970 | new_lwp->must_set_ptrace_flags = 1; | |
971 | ||
644cebc9 | 972 | if (linux_proc_pid_is_stopped (lwpid)) |
c14d7ab2 | 973 | { |
c058728c | 974 | threads_debug_printf ("Attached to a stopped process"); |
c14d7ab2 PA |
975 | |
976 | /* The process is definitely stopped. It is in a job control | |
977 | stop, unless the kernel predates the TASK_STOPPED / | |
978 | TASK_TRACED distinction, in which case it might be in a | |
979 | ptrace stop. Make sure it is in a ptrace stop; from there we | |
980 | can kill it, signal it, et cetera. | |
981 | ||
982 | First make sure there is a pending SIGSTOP. Since we are | |
983 | already attached, the process can not transition from stopped | |
984 | to running without a PTRACE_CONT; so we know this signal will | |
985 | go into the queue. The SIGSTOP generated by PTRACE_ATTACH is | |
986 | probably already in the queue (unless this kernel is old | |
987 | enough to use TASK_STOPPED for ptrace stops); but since | |
988 | SIGSTOP is not an RT signal, it can only be queued once. */ | |
989 | kill_lwp (lwpid, SIGSTOP); | |
990 | ||
991 | /* Finally, resume the stopped process. This will deliver the | |
992 | SIGSTOP (or a higher priority signal, just like normal | |
993 | PTRACE_ATTACH), which we'll catch later on. */ | |
b8e1b30e | 994 | ptrace (PTRACE_CONT, lwpid, (PTRACE_TYPE_ARG3) 0, (PTRACE_TYPE_ARG4) 0); |
c14d7ab2 PA |
995 | } |
996 | ||
0d62e5e8 | 997 | /* The next time we wait for this LWP we'll see a SIGSTOP as PTRACE_ATTACH |
0e21c1ec DE |
998 | brings it to a halt. |
999 | ||
1000 | There are several cases to consider here: | |
1001 | ||
1002 | 1) gdbserver has already attached to the process and is being notified | |
1b3f6016 | 1003 | of a new thread that is being created. |
d50171e4 PA |
1004 | In this case we should ignore that SIGSTOP and resume the |
1005 | process. This is handled below by setting stop_expected = 1, | |
8336d594 | 1006 | and the fact that add_thread sets last_resume_kind == |
d50171e4 | 1007 | resume_continue. |
0e21c1ec DE |
1008 | |
1009 | 2) This is the first thread (the process thread), and we're attaching | |
1b3f6016 PA |
1010 | to it via attach_inferior. |
1011 | In this case we want the process thread to stop. | |
d50171e4 PA |
1012 | This is handled by having linux_attach set last_resume_kind == |
1013 | resume_stop after we return. | |
e3deef73 LM |
1014 | |
1015 | If the pid we are attaching to is also the tgid, we attach to and | |
1016 | stop all the existing threads. Otherwise, we attach to pid and | |
1017 | ignore any other threads in the same group as this pid. | |
0e21c1ec DE |
1018 | |
1019 | 3) GDB is connecting to gdbserver and is requesting an enumeration of all | |
1b3f6016 PA |
1020 | existing threads. |
1021 | In this case we want the thread to stop. | |
1022 | FIXME: This case is currently not properly handled. | |
1023 | We should wait for the SIGSTOP but don't. Things work apparently | |
1024 | because enough time passes between when we ptrace (ATTACH) and when | |
1025 | gdb makes the next ptrace call on the thread. | |
0d62e5e8 DJ |
1026 | |
1027 | On the other hand, if we are currently trying to stop all threads, we | |
1028 | should treat the new thread as if we had sent it a SIGSTOP. This works | |
54a0b537 | 1029 | because we are guaranteed that the add_lwp call above added us to the |
0e21c1ec DE |
1030 | end of the list, and so the new thread has not yet reached |
1031 | wait_for_sigstop (but will). */ | |
d50171e4 | 1032 | new_lwp->stop_expected = 1; |
0d62e5e8 | 1033 | |
7ae1a6a6 | 1034 | return 0; |
95954743 PA |
1035 | } |
1036 | ||
8784d563 PA |
1037 | /* Callback for linux_proc_attach_tgid_threads. Attach to PTID if not |
1038 | already attached. Returns true if a new LWP is found, false | |
1039 | otherwise. */ | |
1040 | ||
1041 | static int | |
1042 | attach_proc_task_lwp_callback (ptid_t ptid) | |
1043 | { | |
1044 | /* Is this a new thread? */ | |
1045 | if (find_thread_ptid (ptid) == NULL) | |
1046 | { | |
e38504b3 | 1047 | int lwpid = ptid.lwp (); |
8784d563 PA |
1048 | int err; |
1049 | ||
c058728c | 1050 | threads_debug_printf ("Found new lwp %d", lwpid); |
8784d563 | 1051 | |
fd000fb3 | 1052 | err = the_linux_target->attach_lwp (ptid); |
8784d563 PA |
1053 | |
1054 | /* Be quiet if we simply raced with the thread exiting. EPERM | |
1055 | is returned if the thread's task still exists, and is marked | |
1056 | as exited or zombie, as well as other conditions, so in that | |
1057 | case, confirm the status in /proc/PID/status. */ | |
1058 | if (err == ESRCH | |
1059 | || (err == EPERM && linux_proc_pid_is_gone (lwpid))) | |
c058728c SM |
1060 | threads_debug_printf |
1061 | ("Cannot attach to lwp %d: thread is gone (%d: %s)", | |
1062 | lwpid, err, safe_strerror (err)); | |
8784d563 PA |
1063 | else if (err != 0) |
1064 | { | |
4d9b86e1 | 1065 | std::string reason |
50fa3001 | 1066 | = linux_ptrace_attach_fail_reason_string (ptid, err); |
4d9b86e1 SM |
1067 | |
1068 | warning (_("Cannot attach to lwp %d: %s"), lwpid, reason.c_str ()); | |
8784d563 PA |
1069 | } |
1070 | ||
1071 | return 1; | |
1072 | } | |
1073 | return 0; | |
1074 | } | |
1075 | ||
500c1d85 PA |
1076 | static void async_file_mark (void); |
1077 | ||
e3deef73 LM |
1078 | /* Attach to PID. If PID is the tgid, attach to it and all |
1079 | of its threads. */ | |
1080 | ||
ef03dad8 TBA |
1081 | int |
1082 | linux_process_target::attach (unsigned long pid) | |
0d62e5e8 | 1083 | { |
500c1d85 PA |
1084 | struct process_info *proc; |
1085 | struct thread_info *initial_thread; | |
184ea2f7 | 1086 | ptid_t ptid = ptid_t (pid, pid); |
7ae1a6a6 PA |
1087 | int err; |
1088 | ||
fd000fb3 | 1089 | proc = add_linux_process (pid, 1); |
df0da8a2 | 1090 | |
e3deef73 LM |
1091 | /* Attach to PID. We will check for other threads |
1092 | soon. */ | |
fd000fb3 | 1093 | err = attach_lwp (ptid); |
7ae1a6a6 | 1094 | if (err != 0) |
4d9b86e1 | 1095 | { |
df0da8a2 | 1096 | remove_process (proc); |
4d9b86e1 | 1097 | |
50fa3001 SDJ |
1098 | std::string reason = linux_ptrace_attach_fail_reason_string (ptid, err); |
1099 | error ("Cannot attach to process %ld: %s", pid, reason.c_str ()); | |
4d9b86e1 | 1100 | } |
7ae1a6a6 | 1101 | |
500c1d85 PA |
1102 | /* Don't ignore the initial SIGSTOP if we just attached to this |
1103 | process. It will be collected by wait shortly. */ | |
184ea2f7 | 1104 | initial_thread = find_thread_ptid (ptid_t (pid, pid)); |
500c1d85 | 1105 | initial_thread->last_resume_kind = resume_stop; |
0d62e5e8 | 1106 | |
8784d563 PA |
1107 | /* We must attach to every LWP. If /proc is mounted, use that to |
1108 | find them now. On the one hand, the inferior may be using raw | |
1109 | clone instead of using pthreads. On the other hand, even if it | |
1110 | is using pthreads, GDB may not be connected yet (thread_db needs | |
1111 | to do symbol lookups, through qSymbol). Also, thread_db walks | |
1112 | structures in the inferior's address space to find the list of | |
1113 | threads/LWPs, and those structures may well be corrupted. Note | |
1114 | that once thread_db is loaded, we'll still use it to list threads | |
1115 | and associate pthread info with each LWP. */ | |
1116 | linux_proc_attach_tgid_threads (pid, attach_proc_task_lwp_callback); | |
500c1d85 PA |
1117 | |
1118 | /* GDB will shortly read the xml target description for this | |
1119 | process, to figure out the process' architecture. But the target | |
1120 | description is only filled in when the first process/thread in | |
1121 | the thread group reports its initial PTRACE_ATTACH SIGSTOP. Do | |
1122 | that now, otherwise, if GDB is fast enough, it could read the | |
1123 | target description _before_ that initial stop. */ | |
1124 | if (non_stop) | |
1125 | { | |
1126 | struct lwp_info *lwp; | |
1127 | int wstat, lwpid; | |
f2907e49 | 1128 | ptid_t pid_ptid = ptid_t (pid); |
500c1d85 | 1129 | |
d16f3f6c | 1130 | lwpid = wait_for_event_filtered (pid_ptid, pid_ptid, &wstat, __WALL); |
500c1d85 PA |
1131 | gdb_assert (lwpid > 0); |
1132 | ||
f2907e49 | 1133 | lwp = find_lwp_pid (ptid_t (lwpid)); |
500c1d85 PA |
1134 | |
1135 | if (!WIFSTOPPED (wstat) || WSTOPSIG (wstat) != SIGSTOP) | |
1136 | { | |
1137 | lwp->status_pending_p = 1; | |
1138 | lwp->status_pending = wstat; | |
1139 | } | |
1140 | ||
1141 | initial_thread->last_resume_kind = resume_continue; | |
1142 | ||
1143 | async_file_mark (); | |
1144 | ||
1145 | gdb_assert (proc->tdesc != NULL); | |
1146 | } | |
1147 | ||
95954743 PA |
1148 | return 0; |
1149 | } | |
1150 | ||
95954743 | 1151 | static int |
e4eb0dec | 1152 | last_thread_of_process_p (int pid) |
95954743 | 1153 | { |
e4eb0dec | 1154 | bool seen_one = false; |
95954743 | 1155 | |
da4ae14a | 1156 | thread_info *thread = find_thread (pid, [&] (thread_info *thr_arg) |
95954743 | 1157 | { |
e4eb0dec SM |
1158 | if (!seen_one) |
1159 | { | |
1160 | /* This is the first thread of this process we see. */ | |
1161 | seen_one = true; | |
1162 | return false; | |
1163 | } | |
1164 | else | |
1165 | { | |
1166 | /* This is the second thread of this process we see. */ | |
1167 | return true; | |
1168 | } | |
1169 | }); | |
da6d8c04 | 1170 | |
e4eb0dec | 1171 | return thread == NULL; |
95954743 PA |
1172 | } |
1173 | ||
da84f473 PA |
1174 | /* Kill LWP. */ |
1175 | ||
1176 | static void | |
1177 | linux_kill_one_lwp (struct lwp_info *lwp) | |
1178 | { | |
d86d4aaf DE |
1179 | struct thread_info *thr = get_lwp_thread (lwp); |
1180 | int pid = lwpid_of (thr); | |
da84f473 PA |
1181 | |
1182 | /* PTRACE_KILL is unreliable. After stepping into a signal handler, | |
1183 | there is no signal context, and ptrace(PTRACE_KILL) (or | |
1184 | ptrace(PTRACE_CONT, SIGKILL), pretty much the same) acts like | |
1185 | ptrace(CONT, pid, 0,0) and just resumes the tracee. A better | |
1186 | alternative is to kill with SIGKILL. We only need one SIGKILL | |
1187 | per process, not one for each thread. But since we still support | |
4a6ed09b PA |
1188 | support debugging programs using raw clone without CLONE_THREAD, |
1189 | we send one for each thread. For years, we used PTRACE_KILL | |
1190 | only, so we're being a bit paranoid about some old kernels where | |
1191 | PTRACE_KILL might work better (dubious if there are any such, but | |
1192 | that's why it's paranoia), so we try SIGKILL first, PTRACE_KILL | |
1193 | second, and so we're fine everywhere. */ | |
da84f473 PA |
1194 | |
1195 | errno = 0; | |
69ff6be5 | 1196 | kill_lwp (pid, SIGKILL); |
da84f473 | 1197 | if (debug_threads) |
ce9e3fe7 PA |
1198 | { |
1199 | int save_errno = errno; | |
1200 | ||
c058728c SM |
1201 | threads_debug_printf ("kill_lwp (SIGKILL) %s, 0, 0 (%s)", |
1202 | target_pid_to_str (ptid_of (thr)).c_str (), | |
1203 | save_errno ? safe_strerror (save_errno) : "OK"); | |
ce9e3fe7 | 1204 | } |
da84f473 PA |
1205 | |
1206 | errno = 0; | |
b8e1b30e | 1207 | ptrace (PTRACE_KILL, pid, (PTRACE_TYPE_ARG3) 0, (PTRACE_TYPE_ARG4) 0); |
da84f473 | 1208 | if (debug_threads) |
ce9e3fe7 PA |
1209 | { |
1210 | int save_errno = errno; | |
1211 | ||
c058728c SM |
1212 | threads_debug_printf ("PTRACE_KILL %s, 0, 0 (%s)", |
1213 | target_pid_to_str (ptid_of (thr)).c_str (), | |
1214 | save_errno ? safe_strerror (save_errno) : "OK"); | |
ce9e3fe7 | 1215 | } |
da84f473 PA |
1216 | } |
1217 | ||
e76126e8 PA |
1218 | /* Kill LWP and wait for it to die. */ |
1219 | ||
1220 | static void | |
1221 | kill_wait_lwp (struct lwp_info *lwp) | |
1222 | { | |
1223 | struct thread_info *thr = get_lwp_thread (lwp); | |
e99b03dc | 1224 | int pid = ptid_of (thr).pid (); |
e38504b3 | 1225 | int lwpid = ptid_of (thr).lwp (); |
e76126e8 PA |
1226 | int wstat; |
1227 | int res; | |
1228 | ||
c058728c | 1229 | threads_debug_printf ("killing lwp %d, for pid: %d", lwpid, pid); |
e76126e8 PA |
1230 | |
1231 | do | |
1232 | { | |
1233 | linux_kill_one_lwp (lwp); | |
1234 | ||
1235 | /* Make sure it died. Notes: | |
1236 | ||
1237 | - The loop is most likely unnecessary. | |
1238 | ||
d16f3f6c | 1239 | - We don't use wait_for_event as that could delete lwps |
e76126e8 PA |
1240 | while we're iterating over them. We're not interested in |
1241 | any pending status at this point, only in making sure all | |
1242 | wait status on the kernel side are collected until the | |
1243 | process is reaped. | |
1244 | ||
1245 | - We don't use __WALL here as the __WALL emulation relies on | |
1246 | SIGCHLD, and killing a stopped process doesn't generate | |
1247 | one, nor an exit status. | |
1248 | */ | |
1249 | res = my_waitpid (lwpid, &wstat, 0); | |
1250 | if (res == -1 && errno == ECHILD) | |
1251 | res = my_waitpid (lwpid, &wstat, __WCLONE); | |
1252 | } while (res > 0 && WIFSTOPPED (wstat)); | |
1253 | ||
586b02a9 PA |
1254 | /* Even if it was stopped, the child may have already disappeared. |
1255 | E.g., if it was killed by SIGKILL. */ | |
1256 | if (res < 0 && errno != ECHILD) | |
1257 | perror_with_name ("kill_wait_lwp"); | |
e76126e8 PA |
1258 | } |
1259 | ||
578290ec | 1260 | /* Callback for `for_each_thread'. Kills an lwp of a given process, |
da84f473 | 1261 | except the leader. */ |
95954743 | 1262 | |
578290ec SM |
1263 | static void |
1264 | kill_one_lwp_callback (thread_info *thread, int pid) | |
da6d8c04 | 1265 | { |
54a0b537 | 1266 | struct lwp_info *lwp = get_thread_lwp (thread); |
0d62e5e8 | 1267 | |
fd500816 DJ |
1268 | /* We avoid killing the first thread here, because of a Linux kernel (at |
1269 | least 2.6.0-test7 through 2.6.8-rc4) bug; if we kill the parent before | |
1270 | the children get a chance to be reaped, it will remain a zombie | |
1271 | forever. */ | |
95954743 | 1272 | |
d86d4aaf | 1273 | if (lwpid_of (thread) == pid) |
95954743 | 1274 | { |
c058728c SM |
1275 | threads_debug_printf ("is last of process %s", |
1276 | target_pid_to_str (thread->id).c_str ()); | |
578290ec | 1277 | return; |
95954743 | 1278 | } |
fd500816 | 1279 | |
e76126e8 | 1280 | kill_wait_lwp (lwp); |
da6d8c04 DJ |
1281 | } |
1282 | ||
c6885a57 TBA |
1283 | int |
1284 | linux_process_target::kill (process_info *process) | |
0d62e5e8 | 1285 | { |
a780ef4f | 1286 | int pid = process->pid; |
9d606399 | 1287 | |
f9e39928 PA |
1288 | /* If we're killing a running inferior, make sure it is stopped |
1289 | first, as PTRACE_KILL will not work otherwise. */ | |
7984d532 | 1290 | stop_all_lwps (0, NULL); |
f9e39928 | 1291 | |
578290ec SM |
1292 | for_each_thread (pid, [&] (thread_info *thread) |
1293 | { | |
1294 | kill_one_lwp_callback (thread, pid); | |
1295 | }); | |
fd500816 | 1296 | |
54a0b537 | 1297 | /* See the comment in linux_kill_one_lwp. We did not kill the first |
fd500816 | 1298 | thread in the list, so do so now. */ |
a780ef4f | 1299 | lwp_info *lwp = find_lwp_pid (ptid_t (pid)); |
bd99dc85 | 1300 | |
784867a5 | 1301 | if (lwp == NULL) |
c058728c | 1302 | threads_debug_printf ("cannot find lwp for pid: %d", pid); |
784867a5 | 1303 | else |
e76126e8 | 1304 | kill_wait_lwp (lwp); |
2d717e4f | 1305 | |
8adb37b9 | 1306 | mourn (process); |
f9e39928 PA |
1307 | |
1308 | /* Since we presently can only stop all lwps of all processes, we | |
1309 | need to unstop lwps of other processes. */ | |
7984d532 | 1310 | unstop_all_lwps (0, NULL); |
95954743 | 1311 | return 0; |
0d62e5e8 DJ |
1312 | } |
1313 | ||
9b224c5e PA |
1314 | /* Get pending signal of THREAD, for detaching purposes. This is the |
1315 | signal the thread last stopped for, which we need to deliver to the | |
1316 | thread when detaching, otherwise, it'd be suppressed/lost. */ | |
1317 | ||
1318 | static int | |
1319 | get_detach_signal (struct thread_info *thread) | |
1320 | { | |
c12a5089 | 1321 | client_state &cs = get_client_state (); |
a493e3e2 | 1322 | enum gdb_signal signo = GDB_SIGNAL_0; |
9b224c5e PA |
1323 | int status; |
1324 | struct lwp_info *lp = get_thread_lwp (thread); | |
1325 | ||
1326 | if (lp->status_pending_p) | |
1327 | status = lp->status_pending; | |
1328 | else | |
1329 | { | |
1330 | /* If the thread had been suspended by gdbserver, and it stopped | |
1331 | cleanly, then it'll have stopped with SIGSTOP. But we don't | |
1332 | want to deliver that SIGSTOP. */ | |
183be222 SM |
1333 | if (thread->last_status.kind () != TARGET_WAITKIND_STOPPED |
1334 | || thread->last_status.sig () == GDB_SIGNAL_0) | |
9b224c5e PA |
1335 | return 0; |
1336 | ||
1337 | /* Otherwise, we may need to deliver the signal we | |
1338 | intercepted. */ | |
1339 | status = lp->last_status; | |
1340 | } | |
1341 | ||
1342 | if (!WIFSTOPPED (status)) | |
1343 | { | |
c058728c SM |
1344 | threads_debug_printf ("lwp %s hasn't stopped: no pending signal", |
1345 | target_pid_to_str (ptid_of (thread)).c_str ()); | |
9b224c5e PA |
1346 | return 0; |
1347 | } | |
1348 | ||
1349 | /* Extended wait statuses aren't real SIGTRAPs. */ | |
89a5711c | 1350 | if (WSTOPSIG (status) == SIGTRAP && linux_is_extended_waitstatus (status)) |
9b224c5e | 1351 | { |
c058728c SM |
1352 | threads_debug_printf ("lwp %s had stopped with extended " |
1353 | "status: no pending signal", | |
1354 | target_pid_to_str (ptid_of (thread)).c_str ()); | |
9b224c5e PA |
1355 | return 0; |
1356 | } | |
1357 | ||
2ea28649 | 1358 | signo = gdb_signal_from_host (WSTOPSIG (status)); |
9b224c5e | 1359 | |
c12a5089 | 1360 | if (cs.program_signals_p && !cs.program_signals[signo]) |
9b224c5e | 1361 | { |
c058728c SM |
1362 | threads_debug_printf ("lwp %s had signal %s, but it is in nopass state", |
1363 | target_pid_to_str (ptid_of (thread)).c_str (), | |
1364 | gdb_signal_to_string (signo)); | |
9b224c5e PA |
1365 | return 0; |
1366 | } | |
c12a5089 | 1367 | else if (!cs.program_signals_p |
9b224c5e PA |
1368 | /* If we have no way to know which signals GDB does not |
1369 | want to have passed to the program, assume | |
1370 | SIGTRAP/SIGINT, which is GDB's default. */ | |
a493e3e2 | 1371 | && (signo == GDB_SIGNAL_TRAP || signo == GDB_SIGNAL_INT)) |
9b224c5e | 1372 | { |
c058728c SM |
1373 | threads_debug_printf ("lwp %s had signal %s, " |
1374 | "but we don't know if we should pass it. " | |
1375 | "Default to not.", | |
1376 | target_pid_to_str (ptid_of (thread)).c_str (), | |
1377 | gdb_signal_to_string (signo)); | |
9b224c5e PA |
1378 | return 0; |
1379 | } | |
1380 | else | |
1381 | { | |
c058728c SM |
1382 | threads_debug_printf ("lwp %s has pending signal %s: delivering it", |
1383 | target_pid_to_str (ptid_of (thread)).c_str (), | |
1384 | gdb_signal_to_string (signo)); | |
9b224c5e PA |
1385 | |
1386 | return WSTOPSIG (status); | |
1387 | } | |
1388 | } | |
1389 | ||
fd000fb3 TBA |
1390 | void |
1391 | linux_process_target::detach_one_lwp (lwp_info *lwp) | |
6ad8ae5c | 1392 | { |
ced2dffb | 1393 | struct thread_info *thread = get_lwp_thread (lwp); |
9b224c5e | 1394 | int sig; |
ced2dffb | 1395 | int lwpid; |
6ad8ae5c | 1396 | |
9b224c5e | 1397 | /* If there is a pending SIGSTOP, get rid of it. */ |
54a0b537 | 1398 | if (lwp->stop_expected) |
ae13219e | 1399 | { |
c058728c SM |
1400 | threads_debug_printf ("Sending SIGCONT to %s", |
1401 | target_pid_to_str (ptid_of (thread)).c_str ()); | |
9b224c5e | 1402 | |
d86d4aaf | 1403 | kill_lwp (lwpid_of (thread), SIGCONT); |
54a0b537 | 1404 | lwp->stop_expected = 0; |
ae13219e DJ |
1405 | } |
1406 | ||
9b224c5e PA |
1407 | /* Pass on any pending signal for this thread. */ |
1408 | sig = get_detach_signal (thread); | |
1409 | ||
ced2dffb PA |
1410 | /* Preparing to resume may try to write registers, and fail if the |
1411 | lwp is zombie. If that happens, ignore the error. We'll handle | |
1412 | it below, when detach fails with ESRCH. */ | |
a70b8144 | 1413 | try |
ced2dffb PA |
1414 | { |
1415 | /* Flush any pending changes to the process's registers. */ | |
1416 | regcache_invalidate_thread (thread); | |
1417 | ||
1418 | /* Finally, let it resume. */ | |
d7599cc0 | 1419 | low_prepare_to_resume (lwp); |
ced2dffb | 1420 | } |
230d2906 | 1421 | catch (const gdb_exception_error &ex) |
ced2dffb PA |
1422 | { |
1423 | if (!check_ptrace_stopped_lwp_gone (lwp)) | |
eedc3f4f | 1424 | throw; |
ced2dffb | 1425 | } |
ced2dffb PA |
1426 | |
1427 | lwpid = lwpid_of (thread); | |
1428 | if (ptrace (PTRACE_DETACH, lwpid, (PTRACE_TYPE_ARG3) 0, | |
b8e1b30e | 1429 | (PTRACE_TYPE_ARG4) (long) sig) < 0) |
ced2dffb PA |
1430 | { |
1431 | int save_errno = errno; | |
1432 | ||
1433 | /* We know the thread exists, so ESRCH must mean the lwp is | |
1434 | zombie. This can happen if one of the already-detached | |
1435 | threads exits the whole thread group. In that case we're | |
1436 | still attached, and must reap the lwp. */ | |
1437 | if (save_errno == ESRCH) | |
1438 | { | |
1439 | int ret, status; | |
1440 | ||
1441 | ret = my_waitpid (lwpid, &status, __WALL); | |
1442 | if (ret == -1) | |
1443 | { | |
1444 | warning (_("Couldn't reap LWP %d while detaching: %s"), | |
6d91ce9a | 1445 | lwpid, safe_strerror (errno)); |
ced2dffb PA |
1446 | } |
1447 | else if (!WIFEXITED (status) && !WIFSIGNALED (status)) | |
1448 | { | |
1449 | warning (_("Reaping LWP %d while detaching " | |
1450 | "returned unexpected status 0x%x"), | |
1451 | lwpid, status); | |
1452 | } | |
1453 | } | |
1454 | else | |
1455 | { | |
1456 | error (_("Can't detach %s: %s"), | |
61d7f128 | 1457 | target_pid_to_str (ptid_of (thread)).c_str (), |
6d91ce9a | 1458 | safe_strerror (save_errno)); |
ced2dffb PA |
1459 | } |
1460 | } | |
c058728c SM |
1461 | else |
1462 | threads_debug_printf ("PTRACE_DETACH (%s, %s, 0) (OK)", | |
1463 | target_pid_to_str (ptid_of (thread)).c_str (), | |
1464 | strsignal (sig)); | |
bd99dc85 PA |
1465 | |
1466 | delete_lwp (lwp); | |
ced2dffb PA |
1467 | } |
1468 | ||
9061c9cf TBA |
1469 | int |
1470 | linux_process_target::detach (process_info *process) | |
95954743 | 1471 | { |
ced2dffb | 1472 | struct lwp_info *main_lwp; |
95954743 | 1473 | |
863d01bd PA |
1474 | /* As there's a step over already in progress, let it finish first, |
1475 | otherwise nesting a stabilize_threads operation on top gets real | |
1476 | messy. */ | |
1477 | complete_ongoing_step_over (); | |
1478 | ||
f9e39928 | 1479 | /* Stop all threads before detaching. First, ptrace requires that |
30baf67b | 1480 | the thread is stopped to successfully detach. Second, thread_db |
f9e39928 PA |
1481 | may need to uninstall thread event breakpoints from memory, which |
1482 | only works with a stopped process anyway. */ | |
7984d532 | 1483 | stop_all_lwps (0, NULL); |
f9e39928 | 1484 | |
ca5c370d | 1485 | #ifdef USE_THREAD_DB |
8336d594 | 1486 | thread_db_detach (process); |
ca5c370d PA |
1487 | #endif |
1488 | ||
fa593d66 | 1489 | /* Stabilize threads (move out of jump pads). */ |
5c9eb2f2 | 1490 | target_stabilize_threads (); |
fa593d66 | 1491 | |
ced2dffb PA |
1492 | /* Detach from the clone lwps first. If the thread group exits just |
1493 | while we're detaching, we must reap the clone lwps before we're | |
1494 | able to reap the leader. */ | |
fd000fb3 TBA |
1495 | for_each_thread (process->pid, [this] (thread_info *thread) |
1496 | { | |
1497 | /* We don't actually detach from the thread group leader just yet. | |
1498 | If the thread group exits, we must reap the zombie clone lwps | |
1499 | before we're able to reap the leader. */ | |
1500 | if (thread->id.pid () == thread->id.lwp ()) | |
1501 | return; | |
1502 | ||
1503 | lwp_info *lwp = get_thread_lwp (thread); | |
1504 | detach_one_lwp (lwp); | |
1505 | }); | |
ced2dffb | 1506 | |
ef2ddb33 | 1507 | main_lwp = find_lwp_pid (ptid_t (process->pid)); |
fd000fb3 | 1508 | detach_one_lwp (main_lwp); |
8336d594 | 1509 | |
8adb37b9 | 1510 | mourn (process); |
f9e39928 PA |
1511 | |
1512 | /* Since we presently can only stop all lwps of all processes, we | |
1513 | need to unstop lwps of other processes. */ | |
7984d532 | 1514 | unstop_all_lwps (0, NULL); |
f9e39928 PA |
1515 | return 0; |
1516 | } | |
1517 | ||
1518 | /* Remove all LWPs that belong to process PROC from the lwp list. */ | |
1519 | ||
8adb37b9 TBA |
1520 | void |
1521 | linux_process_target::mourn (process_info *process) | |
8336d594 PA |
1522 | { |
1523 | struct process_info_private *priv; | |
1524 | ||
1525 | #ifdef USE_THREAD_DB | |
1526 | thread_db_mourn (process); | |
1527 | #endif | |
1528 | ||
fd000fb3 | 1529 | for_each_thread (process->pid, [this] (thread_info *thread) |
6b2a85da SM |
1530 | { |
1531 | delete_lwp (get_thread_lwp (thread)); | |
1532 | }); | |
f9e39928 | 1533 | |
8336d594 | 1534 | /* Freeing all private data. */ |
fe978cb0 | 1535 | priv = process->priv; |
fd000fb3 | 1536 | low_delete_process (priv->arch_private); |
8336d594 | 1537 | free (priv); |
fe978cb0 | 1538 | process->priv = NULL; |
505106cd PA |
1539 | |
1540 | remove_process (process); | |
8336d594 PA |
1541 | } |
1542 | ||
95a49a39 TBA |
1543 | void |
1544 | linux_process_target::join (int pid) | |
444d6139 | 1545 | { |
444d6139 PA |
1546 | int status, ret; |
1547 | ||
1548 | do { | |
d105de22 | 1549 | ret = my_waitpid (pid, &status, 0); |
444d6139 PA |
1550 | if (WIFEXITED (status) || WIFSIGNALED (status)) |
1551 | break; | |
1552 | } while (ret != -1 || errno != ECHILD); | |
1553 | } | |
1554 | ||
13d3d99b TBA |
1555 | /* Return true if the given thread is still alive. */ |
1556 | ||
1557 | bool | |
1558 | linux_process_target::thread_alive (ptid_t ptid) | |
0d62e5e8 | 1559 | { |
95954743 PA |
1560 | struct lwp_info *lwp = find_lwp_pid (ptid); |
1561 | ||
1562 | /* We assume we always know if a thread exits. If a whole process | |
1563 | exited but we still haven't been able to report it to GDB, we'll | |
1564 | hold on to the last lwp of the dead process. */ | |
1565 | if (lwp != NULL) | |
00db26fa | 1566 | return !lwp_is_marked_dead (lwp); |
0d62e5e8 DJ |
1567 | else |
1568 | return 0; | |
1569 | } | |
1570 | ||
df95181f TBA |
1571 | bool |
1572 | linux_process_target::thread_still_has_status_pending (thread_info *thread) | |
582511be PA |
1573 | { |
1574 | struct lwp_info *lp = get_thread_lwp (thread); | |
1575 | ||
1576 | if (!lp->status_pending_p) | |
1577 | return 0; | |
1578 | ||
582511be | 1579 | if (thread->last_resume_kind != resume_stop |
15c66dd6 PA |
1580 | && (lp->stop_reason == TARGET_STOPPED_BY_SW_BREAKPOINT |
1581 | || lp->stop_reason == TARGET_STOPPED_BY_HW_BREAKPOINT)) | |
582511be | 1582 | { |
582511be PA |
1583 | CORE_ADDR pc; |
1584 | int discard = 0; | |
1585 | ||
1586 | gdb_assert (lp->last_status != 0); | |
1587 | ||
1588 | pc = get_pc (lp); | |
1589 | ||
24583e45 TBA |
1590 | scoped_restore_current_thread restore_thread; |
1591 | switch_to_thread (thread); | |
582511be PA |
1592 | |
1593 | if (pc != lp->stop_pc) | |
1594 | { | |
c058728c SM |
1595 | threads_debug_printf ("PC of %ld changed", |
1596 | lwpid_of (thread)); | |
582511be PA |
1597 | discard = 1; |
1598 | } | |
3e572f71 PA |
1599 | |
1600 | #if !USE_SIGTRAP_SIGINFO | |
15c66dd6 | 1601 | else if (lp->stop_reason == TARGET_STOPPED_BY_SW_BREAKPOINT |
d7146cda | 1602 | && !low_breakpoint_at (pc)) |
582511be | 1603 | { |
c058728c SM |
1604 | threads_debug_printf ("previous SW breakpoint of %ld gone", |
1605 | lwpid_of (thread)); | |
582511be PA |
1606 | discard = 1; |
1607 | } | |
15c66dd6 | 1608 | else if (lp->stop_reason == TARGET_STOPPED_BY_HW_BREAKPOINT |
582511be PA |
1609 | && !hardware_breakpoint_inserted_here (pc)) |
1610 | { | |
c058728c SM |
1611 | threads_debug_printf ("previous HW breakpoint of %ld gone", |
1612 | lwpid_of (thread)); | |
582511be PA |
1613 | discard = 1; |
1614 | } | |
3e572f71 | 1615 | #endif |
582511be | 1616 | |
582511be PA |
1617 | if (discard) |
1618 | { | |
c058728c | 1619 | threads_debug_printf ("discarding pending breakpoint status"); |
582511be PA |
1620 | lp->status_pending_p = 0; |
1621 | return 0; | |
1622 | } | |
1623 | } | |
1624 | ||
1625 | return 1; | |
1626 | } | |
1627 | ||
a681f9c9 PA |
1628 | /* Returns true if LWP is resumed from the client's perspective. */ |
1629 | ||
1630 | static int | |
1631 | lwp_resumed (struct lwp_info *lwp) | |
1632 | { | |
1633 | struct thread_info *thread = get_lwp_thread (lwp); | |
1634 | ||
1635 | if (thread->last_resume_kind != resume_stop) | |
1636 | return 1; | |
1637 | ||
1638 | /* Did gdb send us a `vCont;t', but we haven't reported the | |
1639 | corresponding stop to gdb yet? If so, the thread is still | |
1640 | resumed/running from gdb's perspective. */ | |
1641 | if (thread->last_resume_kind == resume_stop | |
183be222 | 1642 | && thread->last_status.kind () == TARGET_WAITKIND_IGNORE) |
a681f9c9 PA |
1643 | return 1; |
1644 | ||
1645 | return 0; | |
1646 | } | |
1647 | ||
df95181f TBA |
1648 | bool |
1649 | linux_process_target::status_pending_p_callback (thread_info *thread, | |
1650 | ptid_t ptid) | |
0d62e5e8 | 1651 | { |
582511be | 1652 | struct lwp_info *lp = get_thread_lwp (thread); |
95954743 PA |
1653 | |
1654 | /* Check if we're only interested in events from a specific process | |
afa8d396 | 1655 | or a specific LWP. */ |
83e1b6c1 | 1656 | if (!thread->id.matches (ptid)) |
95954743 | 1657 | return 0; |
0d62e5e8 | 1658 | |
a681f9c9 PA |
1659 | if (!lwp_resumed (lp)) |
1660 | return 0; | |
1661 | ||
582511be | 1662 | if (lp->status_pending_p |
df95181f | 1663 | && !thread_still_has_status_pending (thread)) |
582511be | 1664 | { |
df95181f | 1665 | resume_one_lwp (lp, lp->stepping, GDB_SIGNAL_0, NULL); |
582511be PA |
1666 | return 0; |
1667 | } | |
0d62e5e8 | 1668 | |
582511be | 1669 | return lp->status_pending_p; |
0d62e5e8 DJ |
1670 | } |
1671 | ||
95954743 PA |
1672 | struct lwp_info * |
1673 | find_lwp_pid (ptid_t ptid) | |
1674 | { | |
da4ae14a | 1675 | thread_info *thread = find_thread ([&] (thread_info *thr_arg) |
454296a2 SM |
1676 | { |
1677 | int lwp = ptid.lwp () != 0 ? ptid.lwp () : ptid.pid (); | |
da4ae14a | 1678 | return thr_arg->id.lwp () == lwp; |
454296a2 | 1679 | }); |
d86d4aaf DE |
1680 | |
1681 | if (thread == NULL) | |
1682 | return NULL; | |
1683 | ||
9c80ecd6 | 1684 | return get_thread_lwp (thread); |
95954743 PA |
1685 | } |
1686 | ||
fa96cb38 | 1687 | /* Return the number of known LWPs in the tgid given by PID. */ |
0d62e5e8 | 1688 | |
fa96cb38 PA |
1689 | static int |
1690 | num_lwps (int pid) | |
1691 | { | |
fa96cb38 | 1692 | int count = 0; |
0d62e5e8 | 1693 | |
4d3bb80e SM |
1694 | for_each_thread (pid, [&] (thread_info *thread) |
1695 | { | |
9c80ecd6 | 1696 | count++; |
4d3bb80e | 1697 | }); |
3aee8918 | 1698 | |
fa96cb38 PA |
1699 | return count; |
1700 | } | |
d61ddec4 | 1701 | |
6d4ee8c6 GB |
1702 | /* See nat/linux-nat.h. */ |
1703 | ||
1704 | struct lwp_info * | |
1705 | iterate_over_lwps (ptid_t filter, | |
d3a70e03 | 1706 | gdb::function_view<iterate_over_lwps_ftype> callback) |
6d4ee8c6 | 1707 | { |
da4ae14a | 1708 | thread_info *thread = find_thread (filter, [&] (thread_info *thr_arg) |
6d1e5673 | 1709 | { |
da4ae14a | 1710 | lwp_info *lwp = get_thread_lwp (thr_arg); |
6d1e5673 | 1711 | |
d3a70e03 | 1712 | return callback (lwp); |
6d1e5673 | 1713 | }); |
6d4ee8c6 | 1714 | |
9c80ecd6 | 1715 | if (thread == NULL) |
6d4ee8c6 GB |
1716 | return NULL; |
1717 | ||
9c80ecd6 | 1718 | return get_thread_lwp (thread); |
6d4ee8c6 GB |
1719 | } |
1720 | ||
fd000fb3 TBA |
1721 | void |
1722 | linux_process_target::check_zombie_leaders () | |
fa96cb38 | 1723 | { |
fd000fb3 | 1724 | for_each_process ([this] (process_info *proc) { |
9179355e SM |
1725 | pid_t leader_pid = pid_of (proc); |
1726 | struct lwp_info *leader_lp; | |
1727 | ||
f2907e49 | 1728 | leader_lp = find_lwp_pid (ptid_t (leader_pid)); |
9179355e | 1729 | |
c058728c SM |
1730 | threads_debug_printf ("leader_pid=%d, leader_lp!=NULL=%d, " |
1731 | "num_lwps=%d, zombie=%d", | |
1732 | leader_pid, leader_lp!= NULL, num_lwps (leader_pid), | |
1733 | linux_proc_pid_is_zombie (leader_pid)); | |
9179355e SM |
1734 | |
1735 | if (leader_lp != NULL && !leader_lp->stopped | |
1736 | /* Check if there are other threads in the group, as we may | |
1737 | have raced with the inferior simply exiting. */ | |
1738 | && !last_thread_of_process_p (leader_pid) | |
1739 | && linux_proc_pid_is_zombie (leader_pid)) | |
1740 | { | |
1741 | /* A leader zombie can mean one of two things: | |
1742 | ||
1743 | - It exited, and there's an exit status pending | |
1744 | available, or only the leader exited (not the whole | |
1745 | program). In the latter case, we can't waitpid the | |
1746 | leader's exit status until all other threads are gone. | |
1747 | ||
1748 | - There are 3 or more threads in the group, and a thread | |
1749 | other than the leader exec'd. On an exec, the Linux | |
1750 | kernel destroys all other threads (except the execing | |
1751 | one) in the thread group, and resets the execing thread's | |
1752 | tid to the tgid. No exit notification is sent for the | |
1753 | execing thread -- from the ptracer's perspective, it | |
1754 | appears as though the execing thread just vanishes. | |
1755 | Until we reap all other threads except the leader and the | |
1756 | execing thread, the leader will be zombie, and the | |
1757 | execing thread will be in `D (disc sleep)'. As soon as | |
1758 | all other threads are reaped, the execing thread changes | |
1759 | it's tid to the tgid, and the previous (zombie) leader | |
1760 | vanishes, giving place to the "new" leader. We could try | |
1761 | distinguishing the exit and exec cases, by waiting once | |
1762 | more, and seeing if something comes out, but it doesn't | |
1763 | sound useful. The previous leader _does_ go away, and | |
1764 | we'll re-add the new one once we see the exec event | |
1765 | (which is just the same as what would happen if the | |
1766 | previous leader did exit voluntarily before some other | |
1767 | thread execs). */ | |
1768 | ||
c058728c SM |
1769 | threads_debug_printf ("Thread group leader %d zombie " |
1770 | "(it exited, or another thread execd).", | |
1771 | leader_pid); | |
9179355e SM |
1772 | |
1773 | delete_lwp (leader_lp); | |
1774 | } | |
1775 | }); | |
fa96cb38 | 1776 | } |
c3adc08c | 1777 | |
a1385b7b SM |
1778 | /* Callback for `find_thread'. Returns the first LWP that is not |
1779 | stopped. */ | |
d50171e4 | 1780 | |
a1385b7b SM |
1781 | static bool |
1782 | not_stopped_callback (thread_info *thread, ptid_t filter) | |
fa96cb38 | 1783 | { |
a1385b7b SM |
1784 | if (!thread->id.matches (filter)) |
1785 | return false; | |
47c0c975 | 1786 | |
a1385b7b | 1787 | lwp_info *lwp = get_thread_lwp (thread); |
fa96cb38 | 1788 | |
a1385b7b | 1789 | return !lwp->stopped; |
0d62e5e8 | 1790 | } |
611cb4a5 | 1791 | |
863d01bd PA |
1792 | /* Increment LWP's suspend count. */ |
1793 | ||
1794 | static void | |
1795 | lwp_suspended_inc (struct lwp_info *lwp) | |
1796 | { | |
1797 | lwp->suspended++; | |
1798 | ||
c058728c SM |
1799 | if (lwp->suspended > 4) |
1800 | threads_debug_printf | |
1801 | ("LWP %ld has a suspiciously high suspend count, suspended=%d", | |
1802 | lwpid_of (get_lwp_thread (lwp)), lwp->suspended); | |
863d01bd PA |
1803 | } |
1804 | ||
1805 | /* Decrement LWP's suspend count. */ | |
1806 | ||
1807 | static void | |
1808 | lwp_suspended_decr (struct lwp_info *lwp) | |
1809 | { | |
1810 | lwp->suspended--; | |
1811 | ||
1812 | if (lwp->suspended < 0) | |
1813 | { | |
1814 | struct thread_info *thread = get_lwp_thread (lwp); | |
1815 | ||
1816 | internal_error (__FILE__, __LINE__, | |
1817 | "unsuspend LWP %ld, suspended=%d\n", lwpid_of (thread), | |
1818 | lwp->suspended); | |
1819 | } | |
1820 | } | |
1821 | ||
219f2f23 PA |
1822 | /* This function should only be called if the LWP got a SIGTRAP. |
1823 | ||
1824 | Handle any tracepoint steps or hits. Return true if a tracepoint | |
1825 | event was handled, 0 otherwise. */ | |
1826 | ||
1827 | static int | |
1828 | handle_tracepoints (struct lwp_info *lwp) | |
1829 | { | |
1830 | struct thread_info *tinfo = get_lwp_thread (lwp); | |
1831 | int tpoint_related_event = 0; | |
1832 | ||
582511be PA |
1833 | gdb_assert (lwp->suspended == 0); |
1834 | ||
7984d532 PA |
1835 | /* If this tracepoint hit causes a tracing stop, we'll immediately |
1836 | uninsert tracepoints. To do this, we temporarily pause all | |
1837 | threads, unpatch away, and then unpause threads. We need to make | |
1838 | sure the unpausing doesn't resume LWP too. */ | |
863d01bd | 1839 | lwp_suspended_inc (lwp); |
7984d532 | 1840 | |
219f2f23 PA |
1841 | /* And we need to be sure that any all-threads-stopping doesn't try |
1842 | to move threads out of the jump pads, as it could deadlock the | |
1843 | inferior (LWP could be in the jump pad, maybe even holding the | |
1844 | lock.) */ | |
1845 | ||
1846 | /* Do any necessary step collect actions. */ | |
1847 | tpoint_related_event |= tracepoint_finished_step (tinfo, lwp->stop_pc); | |
1848 | ||
fa593d66 PA |
1849 | tpoint_related_event |= handle_tracepoint_bkpts (tinfo, lwp->stop_pc); |
1850 | ||
219f2f23 PA |
1851 | /* See if we just hit a tracepoint and do its main collect |
1852 | actions. */ | |
1853 | tpoint_related_event |= tracepoint_was_hit (tinfo, lwp->stop_pc); | |
1854 | ||
863d01bd | 1855 | lwp_suspended_decr (lwp); |
7984d532 PA |
1856 | |
1857 | gdb_assert (lwp->suspended == 0); | |
229d26fc SM |
1858 | gdb_assert (!stabilizing_threads |
1859 | || (lwp->collecting_fast_tracepoint | |
1860 | != fast_tpoint_collect_result::not_collecting)); | |
7984d532 | 1861 | |
219f2f23 PA |
1862 | if (tpoint_related_event) |
1863 | { | |
c058728c | 1864 | threads_debug_printf ("got a tracepoint event"); |
219f2f23 PA |
1865 | return 1; |
1866 | } | |
1867 | ||
1868 | return 0; | |
1869 | } | |
1870 | ||
13e567af TBA |
1871 | fast_tpoint_collect_result |
1872 | linux_process_target::linux_fast_tracepoint_collecting | |
1873 | (lwp_info *lwp, fast_tpoint_collect_status *status) | |
fa593d66 PA |
1874 | { |
1875 | CORE_ADDR thread_area; | |
d86d4aaf | 1876 | struct thread_info *thread = get_lwp_thread (lwp); |
fa593d66 | 1877 | |
fa593d66 PA |
1878 | /* Get the thread area address. This is used to recognize which |
1879 | thread is which when tracing with the in-process agent library. | |
1880 | We don't read anything from the address, and treat it as opaque; | |
1881 | it's the address itself that we assume is unique per-thread. */ | |
13e567af | 1882 | if (low_get_thread_area (lwpid_of (thread), &thread_area) == -1) |
229d26fc | 1883 | return fast_tpoint_collect_result::not_collecting; |
fa593d66 PA |
1884 | |
1885 | return fast_tracepoint_collecting (thread_area, lwp->stop_pc, status); | |
1886 | } | |
1887 | ||
13e567af TBA |
1888 | int |
1889 | linux_process_target::low_get_thread_area (int lwpid, CORE_ADDR *addrp) | |
1890 | { | |
1891 | return -1; | |
1892 | } | |
1893 | ||
d16f3f6c TBA |
1894 | bool |
1895 | linux_process_target::maybe_move_out_of_jump_pad (lwp_info *lwp, int *wstat) | |
fa593d66 | 1896 | { |
24583e45 TBA |
1897 | scoped_restore_current_thread restore_thread; |
1898 | switch_to_thread (get_lwp_thread (lwp)); | |
fa593d66 PA |
1899 | |
1900 | if ((wstat == NULL | |
1901 | || (WIFSTOPPED (*wstat) && WSTOPSIG (*wstat) != SIGTRAP)) | |
1902 | && supports_fast_tracepoints () | |
58b4daa5 | 1903 | && agent_loaded_p ()) |
fa593d66 PA |
1904 | { |
1905 | struct fast_tpoint_collect_status status; | |
fa593d66 | 1906 | |
c058728c SM |
1907 | threads_debug_printf |
1908 | ("Checking whether LWP %ld needs to move out of the jump pad.", | |
1909 | lwpid_of (current_thread)); | |
fa593d66 | 1910 | |
229d26fc SM |
1911 | fast_tpoint_collect_result r |
1912 | = linux_fast_tracepoint_collecting (lwp, &status); | |
fa593d66 PA |
1913 | |
1914 | if (wstat == NULL | |
1915 | || (WSTOPSIG (*wstat) != SIGILL | |
1916 | && WSTOPSIG (*wstat) != SIGFPE | |
1917 | && WSTOPSIG (*wstat) != SIGSEGV | |
1918 | && WSTOPSIG (*wstat) != SIGBUS)) | |
1919 | { | |
1920 | lwp->collecting_fast_tracepoint = r; | |
1921 | ||
229d26fc | 1922 | if (r != fast_tpoint_collect_result::not_collecting) |
fa593d66 | 1923 | { |
229d26fc SM |
1924 | if (r == fast_tpoint_collect_result::before_insn |
1925 | && lwp->exit_jump_pad_bkpt == NULL) | |
fa593d66 PA |
1926 | { |
1927 | /* Haven't executed the original instruction yet. | |
1928 | Set breakpoint there, and wait till it's hit, | |
1929 | then single-step until exiting the jump pad. */ | |
1930 | lwp->exit_jump_pad_bkpt | |
1931 | = set_breakpoint_at (status.adjusted_insn_addr, NULL); | |
1932 | } | |
1933 | ||
c058728c SM |
1934 | threads_debug_printf |
1935 | ("Checking whether LWP %ld needs to move out of the jump pad..." | |
1936 | " it does", lwpid_of (current_thread)); | |
fa593d66 | 1937 | |
d16f3f6c | 1938 | return true; |
fa593d66 PA |
1939 | } |
1940 | } | |
1941 | else | |
1942 | { | |
1943 | /* If we get a synchronous signal while collecting, *and* | |
1944 | while executing the (relocated) original instruction, | |
1945 | reset the PC to point at the tpoint address, before | |
1946 | reporting to GDB. Otherwise, it's an IPA lib bug: just | |
1947 | report the signal to GDB, and pray for the best. */ | |
1948 | ||
229d26fc SM |
1949 | lwp->collecting_fast_tracepoint |
1950 | = fast_tpoint_collect_result::not_collecting; | |
fa593d66 | 1951 | |
229d26fc | 1952 | if (r != fast_tpoint_collect_result::not_collecting |
fa593d66 PA |
1953 | && (status.adjusted_insn_addr <= lwp->stop_pc |
1954 | && lwp->stop_pc < status.adjusted_insn_addr_end)) | |
1955 | { | |
1956 | siginfo_t info; | |
1957 | struct regcache *regcache; | |
1958 | ||
1959 | /* The si_addr on a few signals references the address | |
1960 | of the faulting instruction. Adjust that as | |
1961 | well. */ | |
1962 | if ((WSTOPSIG (*wstat) == SIGILL | |
1963 | || WSTOPSIG (*wstat) == SIGFPE | |
1964 | || WSTOPSIG (*wstat) == SIGBUS | |
1965 | || WSTOPSIG (*wstat) == SIGSEGV) | |
0bfdf32f | 1966 | && ptrace (PTRACE_GETSIGINFO, lwpid_of (current_thread), |
b8e1b30e | 1967 | (PTRACE_TYPE_ARG3) 0, &info) == 0 |
fa593d66 PA |
1968 | /* Final check just to make sure we don't clobber |
1969 | the siginfo of non-kernel-sent signals. */ | |
1970 | && (uintptr_t) info.si_addr == lwp->stop_pc) | |
1971 | { | |
1972 | info.si_addr = (void *) (uintptr_t) status.tpoint_addr; | |
0bfdf32f | 1973 | ptrace (PTRACE_SETSIGINFO, lwpid_of (current_thread), |
b8e1b30e | 1974 | (PTRACE_TYPE_ARG3) 0, &info); |
fa593d66 PA |
1975 | } |
1976 | ||
0bfdf32f | 1977 | regcache = get_thread_regcache (current_thread, 1); |
bf9ae9d8 | 1978 | low_set_pc (regcache, status.tpoint_addr); |
fa593d66 PA |
1979 | lwp->stop_pc = status.tpoint_addr; |
1980 | ||
1981 | /* Cancel any fast tracepoint lock this thread was | |
1982 | holding. */ | |
1983 | force_unlock_trace_buffer (); | |
1984 | } | |
1985 | ||
1986 | if (lwp->exit_jump_pad_bkpt != NULL) | |
1987 | { | |
c058728c SM |
1988 | threads_debug_printf |
1989 | ("Cancelling fast exit-jump-pad: removing bkpt." | |
1990 | "stopping all threads momentarily."); | |
fa593d66 PA |
1991 | |
1992 | stop_all_lwps (1, lwp); | |
fa593d66 PA |
1993 | |
1994 | delete_breakpoint (lwp->exit_jump_pad_bkpt); | |
1995 | lwp->exit_jump_pad_bkpt = NULL; | |
1996 | ||
1997 | unstop_all_lwps (1, lwp); | |
1998 | ||
1999 | gdb_assert (lwp->suspended >= 0); | |
2000 | } | |
2001 | } | |
2002 | } | |
2003 | ||
c058728c SM |
2004 | threads_debug_printf |
2005 | ("Checking whether LWP %ld needs to move out of the jump pad... no", | |
2006 | lwpid_of (current_thread)); | |
0cccb683 | 2007 | |
d16f3f6c | 2008 | return false; |
fa593d66 PA |
2009 | } |
2010 | ||
2011 | /* Enqueue one signal in the "signals to report later when out of the | |
2012 | jump pad" list. */ | |
2013 | ||
2014 | static void | |
2015 | enqueue_one_deferred_signal (struct lwp_info *lwp, int *wstat) | |
2016 | { | |
d86d4aaf | 2017 | struct thread_info *thread = get_lwp_thread (lwp); |
fa593d66 | 2018 | |
c058728c SM |
2019 | threads_debug_printf ("Deferring signal %d for LWP %ld.", |
2020 | WSTOPSIG (*wstat), lwpid_of (thread)); | |
fa593d66 PA |
2021 | |
2022 | if (debug_threads) | |
2023 | { | |
013e3554 | 2024 | for (const auto &sig : lwp->pending_signals_to_report) |
c058728c | 2025 | threads_debug_printf (" Already queued %d", sig.signal); |
fa593d66 | 2026 | |
c058728c | 2027 | threads_debug_printf (" (no more currently queued signals)"); |
fa593d66 PA |
2028 | } |
2029 | ||
1a981360 PA |
2030 | /* Don't enqueue non-RT signals if they are already in the deferred |
2031 | queue. (SIGSTOP being the easiest signal to see ending up here | |
2032 | twice) */ | |
2033 | if (WSTOPSIG (*wstat) < __SIGRTMIN) | |
2034 | { | |
013e3554 | 2035 | for (const auto &sig : lwp->pending_signals_to_report) |
1a981360 | 2036 | { |
013e3554 | 2037 | if (sig.signal == WSTOPSIG (*wstat)) |
1a981360 | 2038 | { |
c058728c SM |
2039 | threads_debug_printf |
2040 | ("Not requeuing already queued non-RT signal %d for LWP %ld", | |
2041 | sig.signal, lwpid_of (thread)); | |
1a981360 PA |
2042 | return; |
2043 | } | |
2044 | } | |
2045 | } | |
2046 | ||
013e3554 | 2047 | lwp->pending_signals_to_report.emplace_back (WSTOPSIG (*wstat)); |
8d749320 | 2048 | |
d86d4aaf | 2049 | ptrace (PTRACE_GETSIGINFO, lwpid_of (thread), (PTRACE_TYPE_ARG3) 0, |
013e3554 | 2050 | &lwp->pending_signals_to_report.back ().info); |
fa593d66 PA |
2051 | } |
2052 | ||
2053 | /* Dequeue one signal from the "signals to report later when out of | |
2054 | the jump pad" list. */ | |
2055 | ||
2056 | static int | |
2057 | dequeue_one_deferred_signal (struct lwp_info *lwp, int *wstat) | |
2058 | { | |
d86d4aaf DE |
2059 | struct thread_info *thread = get_lwp_thread (lwp); |
2060 | ||
013e3554 | 2061 | if (!lwp->pending_signals_to_report.empty ()) |
fa593d66 | 2062 | { |
013e3554 | 2063 | const pending_signal &p_sig = lwp->pending_signals_to_report.front (); |
fa593d66 | 2064 | |
013e3554 TBA |
2065 | *wstat = W_STOPCODE (p_sig.signal); |
2066 | if (p_sig.info.si_signo != 0) | |
d86d4aaf | 2067 | ptrace (PTRACE_SETSIGINFO, lwpid_of (thread), (PTRACE_TYPE_ARG3) 0, |
013e3554 TBA |
2068 | &p_sig.info); |
2069 | ||
2070 | lwp->pending_signals_to_report.pop_front (); | |
fa593d66 | 2071 | |
c058728c SM |
2072 | threads_debug_printf ("Reporting deferred signal %d for LWP %ld.", |
2073 | WSTOPSIG (*wstat), lwpid_of (thread)); | |
fa593d66 PA |
2074 | |
2075 | if (debug_threads) | |
2076 | { | |
013e3554 | 2077 | for (const auto &sig : lwp->pending_signals_to_report) |
c058728c | 2078 | threads_debug_printf (" Still queued %d", sig.signal); |
fa593d66 | 2079 | |
c058728c | 2080 | threads_debug_printf (" (no more queued signals)"); |
fa593d66 PA |
2081 | } |
2082 | ||
2083 | return 1; | |
2084 | } | |
2085 | ||
2086 | return 0; | |
2087 | } | |
2088 | ||
ac1bbaca TBA |
2089 | bool |
2090 | linux_process_target::check_stopped_by_watchpoint (lwp_info *child) | |
582511be | 2091 | { |
24583e45 TBA |
2092 | scoped_restore_current_thread restore_thread; |
2093 | switch_to_thread (get_lwp_thread (child)); | |
d50171e4 | 2094 | |
ac1bbaca TBA |
2095 | if (low_stopped_by_watchpoint ()) |
2096 | { | |
2097 | child->stop_reason = TARGET_STOPPED_BY_WATCHPOINT; | |
2098 | child->stopped_data_address = low_stopped_data_address (); | |
2099 | } | |
582511be | 2100 | |
ac1bbaca TBA |
2101 | return child->stop_reason == TARGET_STOPPED_BY_WATCHPOINT; |
2102 | } | |
d50171e4 | 2103 | |
ac1bbaca TBA |
2104 | bool |
2105 | linux_process_target::low_stopped_by_watchpoint () | |
2106 | { | |
2107 | return false; | |
2108 | } | |
d50171e4 | 2109 | |
ac1bbaca TBA |
2110 | CORE_ADDR |
2111 | linux_process_target::low_stopped_data_address () | |
2112 | { | |
2113 | return 0; | |
c4d9ceb6 YQ |
2114 | } |
2115 | ||
de0d863e DB |
2116 | /* Return the ptrace options that we want to try to enable. */ |
2117 | ||
2118 | static int | |
2119 | linux_low_ptrace_options (int attached) | |
2120 | { | |
c12a5089 | 2121 | client_state &cs = get_client_state (); |
de0d863e DB |
2122 | int options = 0; |
2123 | ||
2124 | if (!attached) | |
2125 | options |= PTRACE_O_EXITKILL; | |
2126 | ||
c12a5089 | 2127 | if (cs.report_fork_events) |
de0d863e DB |
2128 | options |= PTRACE_O_TRACEFORK; |
2129 | ||
c12a5089 | 2130 | if (cs.report_vfork_events) |
c269dbdb DB |
2131 | options |= (PTRACE_O_TRACEVFORK | PTRACE_O_TRACEVFORKDONE); |
2132 | ||
c12a5089 | 2133 | if (cs.report_exec_events) |
94585166 DB |
2134 | options |= PTRACE_O_TRACEEXEC; |
2135 | ||
82075af2 JS |
2136 | options |= PTRACE_O_TRACESYSGOOD; |
2137 | ||
de0d863e DB |
2138 | return options; |
2139 | } | |
2140 | ||
1a48f002 | 2141 | void |
d16f3f6c | 2142 | linux_process_target::filter_event (int lwpid, int wstat) |
fa96cb38 | 2143 | { |
c12a5089 | 2144 | client_state &cs = get_client_state (); |
fa96cb38 PA |
2145 | struct lwp_info *child; |
2146 | struct thread_info *thread; | |
582511be | 2147 | int have_stop_pc = 0; |
fa96cb38 | 2148 | |
f2907e49 | 2149 | child = find_lwp_pid (ptid_t (lwpid)); |
fa96cb38 | 2150 | |
5406bc3f PA |
2151 | /* Check for events reported by anything not in our LWP list. */ |
2152 | if (child == nullptr) | |
94585166 | 2153 | { |
5406bc3f PA |
2154 | if (WIFSTOPPED (wstat)) |
2155 | { | |
2156 | if (WSTOPSIG (wstat) == SIGTRAP | |
2157 | && linux_ptrace_get_extended_event (wstat) == PTRACE_EVENT_EXEC) | |
2158 | { | |
2159 | /* A non-leader thread exec'ed after we've seen the | |
2160 | leader zombie, and removed it from our lists (in | |
2161 | check_zombie_leaders). The non-leader thread changes | |
2162 | its tid to the tgid. */ | |
2163 | threads_debug_printf | |
2164 | ("Re-adding thread group leader LWP %d after exec.", | |
2165 | lwpid); | |
94585166 | 2166 | |
5406bc3f PA |
2167 | child = add_lwp (ptid_t (lwpid, lwpid)); |
2168 | child->stopped = 1; | |
2169 | switch_to_thread (child->thread); | |
2170 | } | |
2171 | else | |
2172 | { | |
2173 | /* A process we are controlling has forked and the new | |
2174 | child's stop was reported to us by the kernel. Save | |
2175 | its PID and go back to waiting for the fork event to | |
2176 | be reported - the stopped process might be returned | |
2177 | from waitpid before or after the fork event is. */ | |
2178 | threads_debug_printf | |
2179 | ("Saving LWP %d status %s in stopped_pids list", | |
2180 | lwpid, status_to_str (wstat).c_str ()); | |
2181 | add_to_pid_list (&stopped_pids, lwpid, wstat); | |
2182 | } | |
2183 | } | |
2184 | else | |
2185 | { | |
2186 | /* Don't report an event for the exit of an LWP not in our | |
2187 | list, i.e. not part of any inferior we're debugging. | |
2188 | This can happen if we detach from a program we originally | |
2189 | forked and then it exits. */ | |
2190 | } | |
94585166 | 2191 | |
5406bc3f PA |
2192 | if (child == nullptr) |
2193 | return; | |
fa96cb38 | 2194 | } |
fa96cb38 PA |
2195 | |
2196 | thread = get_lwp_thread (child); | |
2197 | ||
2198 | child->stopped = 1; | |
2199 | ||
2200 | child->last_status = wstat; | |
2201 | ||
582511be PA |
2202 | /* Check if the thread has exited. */ |
2203 | if ((WIFEXITED (wstat) || WIFSIGNALED (wstat))) | |
2204 | { | |
c058728c | 2205 | threads_debug_printf ("%d exited", lwpid); |
f50bf8e5 YQ |
2206 | |
2207 | if (finish_step_over (child)) | |
2208 | { | |
2209 | /* Unsuspend all other LWPs, and set them back running again. */ | |
2210 | unsuspend_all_lwps (child); | |
2211 | } | |
2212 | ||
65706a29 PA |
2213 | /* If there is at least one more LWP, then the exit signal was |
2214 | not the end of the debugged application and should be | |
2215 | ignored, unless GDB wants to hear about thread exits. */ | |
c12a5089 | 2216 | if (cs.report_thread_events |
65706a29 | 2217 | || last_thread_of_process_p (pid_of (thread))) |
582511be | 2218 | { |
65706a29 PA |
2219 | /* Since events are serialized to GDB core, and we can't |
2220 | report this one right now. Leave the status pending for | |
2221 | the next time we're able to report it. */ | |
2222 | mark_lwp_dead (child, wstat); | |
1a48f002 | 2223 | return; |
582511be PA |
2224 | } |
2225 | else | |
2226 | { | |
65706a29 | 2227 | delete_lwp (child); |
1a48f002 | 2228 | return; |
582511be PA |
2229 | } |
2230 | } | |
2231 | ||
2232 | gdb_assert (WIFSTOPPED (wstat)); | |
2233 | ||
fa96cb38 PA |
2234 | if (WIFSTOPPED (wstat)) |
2235 | { | |
2236 | struct process_info *proc; | |
2237 | ||
c06cbd92 | 2238 | /* Architecture-specific setup after inferior is running. */ |
fa96cb38 | 2239 | proc = find_process_pid (pid_of (thread)); |
c06cbd92 | 2240 | if (proc->tdesc == NULL) |
fa96cb38 | 2241 | { |
c06cbd92 YQ |
2242 | if (proc->attached) |
2243 | { | |
c06cbd92 YQ |
2244 | /* This needs to happen after we have attached to the |
2245 | inferior and it is stopped for the first time, but | |
2246 | before we access any inferior registers. */ | |
797bcff5 | 2247 | arch_setup_thread (thread); |
c06cbd92 YQ |
2248 | } |
2249 | else | |
2250 | { | |
2251 | /* The process is started, but GDBserver will do | |
2252 | architecture-specific setup after the program stops at | |
2253 | the first instruction. */ | |
2254 | child->status_pending_p = 1; | |
2255 | child->status_pending = wstat; | |
1a48f002 | 2256 | return; |
c06cbd92 | 2257 | } |
fa96cb38 PA |
2258 | } |
2259 | } | |
2260 | ||
fa96cb38 PA |
2261 | if (WIFSTOPPED (wstat) && child->must_set_ptrace_flags) |
2262 | { | |
beed38b8 | 2263 | struct process_info *proc = find_process_pid (pid_of (thread)); |
de0d863e | 2264 | int options = linux_low_ptrace_options (proc->attached); |
beed38b8 | 2265 | |
de0d863e | 2266 | linux_enable_event_reporting (lwpid, options); |
fa96cb38 PA |
2267 | child->must_set_ptrace_flags = 0; |
2268 | } | |
2269 | ||
82075af2 JS |
2270 | /* Always update syscall_state, even if it will be filtered later. */ |
2271 | if (WIFSTOPPED (wstat) && WSTOPSIG (wstat) == SYSCALL_SIGTRAP) | |
2272 | { | |
2273 | child->syscall_state | |
2274 | = (child->syscall_state == TARGET_WAITKIND_SYSCALL_ENTRY | |
2275 | ? TARGET_WAITKIND_SYSCALL_RETURN | |
2276 | : TARGET_WAITKIND_SYSCALL_ENTRY); | |
2277 | } | |
2278 | else | |
2279 | { | |
2280 | /* Almost all other ptrace-stops are known to be outside of system | |
2281 | calls, with further exceptions in handle_extended_wait. */ | |
2282 | child->syscall_state = TARGET_WAITKIND_IGNORE; | |
2283 | } | |
2284 | ||
e7ad2f14 PA |
2285 | /* Be careful to not overwrite stop_pc until save_stop_reason is |
2286 | called. */ | |
fa96cb38 | 2287 | if (WIFSTOPPED (wstat) && WSTOPSIG (wstat) == SIGTRAP |
89a5711c | 2288 | && linux_is_extended_waitstatus (wstat)) |
fa96cb38 | 2289 | { |
582511be | 2290 | child->stop_pc = get_pc (child); |
94585166 | 2291 | if (handle_extended_wait (&child, wstat)) |
de0d863e DB |
2292 | { |
2293 | /* The event has been handled, so just return without | |
2294 | reporting it. */ | |
1a48f002 | 2295 | return; |
de0d863e | 2296 | } |
fa96cb38 PA |
2297 | } |
2298 | ||
80aea927 | 2299 | if (linux_wstatus_maybe_breakpoint (wstat)) |
582511be | 2300 | { |
e7ad2f14 | 2301 | if (save_stop_reason (child)) |
582511be PA |
2302 | have_stop_pc = 1; |
2303 | } | |
2304 | ||
2305 | if (!have_stop_pc) | |
2306 | child->stop_pc = get_pc (child); | |
2307 | ||
fa96cb38 PA |
2308 | if (WIFSTOPPED (wstat) && WSTOPSIG (wstat) == SIGSTOP |
2309 | && child->stop_expected) | |
2310 | { | |
c058728c SM |
2311 | threads_debug_printf ("Expected stop."); |
2312 | ||
fa96cb38 PA |
2313 | child->stop_expected = 0; |
2314 | ||
2315 | if (thread->last_resume_kind == resume_stop) | |
2316 | { | |
2317 | /* We want to report the stop to the core. Treat the | |
2318 | SIGSTOP as a normal event. */ | |
c058728c SM |
2319 | threads_debug_printf ("resume_stop SIGSTOP caught for %s.", |
2320 | target_pid_to_str (ptid_of (thread)).c_str ()); | |
fa96cb38 PA |
2321 | } |
2322 | else if (stopping_threads != NOT_STOPPING_THREADS) | |
2323 | { | |
2324 | /* Stopping threads. We don't want this SIGSTOP to end up | |
582511be | 2325 | pending. */ |
c058728c SM |
2326 | threads_debug_printf ("SIGSTOP caught for %s while stopping threads.", |
2327 | target_pid_to_str (ptid_of (thread)).c_str ()); | |
1a48f002 | 2328 | return; |
fa96cb38 PA |
2329 | } |
2330 | else | |
2331 | { | |
2bf6fb9d | 2332 | /* This is a delayed SIGSTOP. Filter out the event. */ |
c058728c | 2333 | threads_debug_printf ("%s %s, 0, 0 (discard delayed SIGSTOP)", |
2bf6fb9d | 2334 | child->stepping ? "step" : "continue", |
61d7f128 | 2335 | target_pid_to_str (ptid_of (thread)).c_str ()); |
2bf6fb9d | 2336 | |
df95181f | 2337 | resume_one_lwp (child, child->stepping, 0, NULL); |
1a48f002 | 2338 | return; |
fa96cb38 PA |
2339 | } |
2340 | } | |
2341 | ||
582511be PA |
2342 | child->status_pending_p = 1; |
2343 | child->status_pending = wstat; | |
1a48f002 | 2344 | return; |
fa96cb38 PA |
2345 | } |
2346 | ||
b31cdfa6 TBA |
2347 | bool |
2348 | linux_process_target::maybe_hw_step (thread_info *thread) | |
f79b145d | 2349 | { |
b31cdfa6 TBA |
2350 | if (supports_hardware_single_step ()) |
2351 | return true; | |
f79b145d YQ |
2352 | else |
2353 | { | |
3b9a79ef | 2354 | /* GDBserver must insert single-step breakpoint for software |
f79b145d | 2355 | single step. */ |
3b9a79ef | 2356 | gdb_assert (has_single_step_breakpoints (thread)); |
b31cdfa6 | 2357 | return false; |
f79b145d YQ |
2358 | } |
2359 | } | |
2360 | ||
df95181f TBA |
2361 | void |
2362 | linux_process_target::resume_stopped_resumed_lwps (thread_info *thread) | |
20ba1ce6 | 2363 | { |
20ba1ce6 PA |
2364 | struct lwp_info *lp = get_thread_lwp (thread); |
2365 | ||
2366 | if (lp->stopped | |
863d01bd | 2367 | && !lp->suspended |
20ba1ce6 | 2368 | && !lp->status_pending_p |
183be222 | 2369 | && thread->last_status.kind () == TARGET_WAITKIND_IGNORE) |
20ba1ce6 | 2370 | { |
8901d193 YQ |
2371 | int step = 0; |
2372 | ||
2373 | if (thread->last_resume_kind == resume_step) | |
2374 | step = maybe_hw_step (thread); | |
20ba1ce6 | 2375 | |
c058728c SM |
2376 | threads_debug_printf ("resuming stopped-resumed LWP %s at %s: step=%d", |
2377 | target_pid_to_str (ptid_of (thread)).c_str (), | |
2378 | paddress (lp->stop_pc), step); | |
20ba1ce6 | 2379 | |
df95181f | 2380 | resume_one_lwp (lp, step, GDB_SIGNAL_0, NULL); |
20ba1ce6 PA |
2381 | } |
2382 | } | |
2383 | ||
d16f3f6c TBA |
2384 | int |
2385 | linux_process_target::wait_for_event_filtered (ptid_t wait_ptid, | |
2386 | ptid_t filter_ptid, | |
2387 | int *wstatp, int options) | |
0d62e5e8 | 2388 | { |
d86d4aaf | 2389 | struct thread_info *event_thread; |
d50171e4 | 2390 | struct lwp_info *event_child, *requested_child; |
fa96cb38 | 2391 | sigset_t block_mask, prev_mask; |
d50171e4 | 2392 | |
fa96cb38 | 2393 | retry: |
d86d4aaf DE |
2394 | /* N.B. event_thread points to the thread_info struct that contains |
2395 | event_child. Keep them in sync. */ | |
2396 | event_thread = NULL; | |
d50171e4 PA |
2397 | event_child = NULL; |
2398 | requested_child = NULL; | |
0d62e5e8 | 2399 | |
95954743 | 2400 | /* Check for a lwp with a pending status. */ |
bd99dc85 | 2401 | |
d7e15655 | 2402 | if (filter_ptid == minus_one_ptid || filter_ptid.is_pid ()) |
0d62e5e8 | 2403 | { |
83e1b6c1 SM |
2404 | event_thread = find_thread_in_random ([&] (thread_info *thread) |
2405 | { | |
2406 | return status_pending_p_callback (thread, filter_ptid); | |
2407 | }); | |
2408 | ||
d86d4aaf | 2409 | if (event_thread != NULL) |
c058728c SM |
2410 | { |
2411 | event_child = get_thread_lwp (event_thread); | |
2412 | threads_debug_printf ("Got a pending child %ld", lwpid_of (event_thread)); | |
2413 | } | |
0d62e5e8 | 2414 | } |
d7e15655 | 2415 | else if (filter_ptid != null_ptid) |
0d62e5e8 | 2416 | { |
fa96cb38 | 2417 | requested_child = find_lwp_pid (filter_ptid); |
d50171e4 | 2418 | |
bde24c0a | 2419 | if (stopping_threads == NOT_STOPPING_THREADS |
fa593d66 | 2420 | && requested_child->status_pending_p |
229d26fc SM |
2421 | && (requested_child->collecting_fast_tracepoint |
2422 | != fast_tpoint_collect_result::not_collecting)) | |
fa593d66 PA |
2423 | { |
2424 | enqueue_one_deferred_signal (requested_child, | |
2425 | &requested_child->status_pending); | |
2426 | requested_child->status_pending_p = 0; | |
2427 | requested_child->status_pending = 0; | |
df95181f | 2428 | resume_one_lwp (requested_child, 0, 0, NULL); |
fa593d66 PA |
2429 | } |
2430 | ||
2431 | if (requested_child->suspended | |
2432 | && requested_child->status_pending_p) | |
38e08fca GB |
2433 | { |
2434 | internal_error (__FILE__, __LINE__, | |
2435 | "requesting an event out of a" | |
2436 | " suspended child?"); | |
2437 | } | |
fa593d66 | 2438 | |
d50171e4 | 2439 | if (requested_child->status_pending_p) |
d86d4aaf DE |
2440 | { |
2441 | event_child = requested_child; | |
2442 | event_thread = get_lwp_thread (event_child); | |
2443 | } | |
0d62e5e8 | 2444 | } |
611cb4a5 | 2445 | |
0d62e5e8 DJ |
2446 | if (event_child != NULL) |
2447 | { | |
c058728c SM |
2448 | threads_debug_printf ("Got an event from pending child %ld (%04x)", |
2449 | lwpid_of (event_thread), | |
2450 | event_child->status_pending); | |
2451 | ||
fa96cb38 | 2452 | *wstatp = event_child->status_pending; |
bd99dc85 PA |
2453 | event_child->status_pending_p = 0; |
2454 | event_child->status_pending = 0; | |
24583e45 | 2455 | switch_to_thread (event_thread); |
d86d4aaf | 2456 | return lwpid_of (event_thread); |
0d62e5e8 DJ |
2457 | } |
2458 | ||
fa96cb38 PA |
2459 | /* But if we don't find a pending event, we'll have to wait. |
2460 | ||
2461 | We only enter this loop if no process has a pending wait status. | |
2462 | Thus any action taken in response to a wait status inside this | |
2463 | loop is responding as soon as we detect the status, not after any | |
2464 | pending events. */ | |
d8301ad1 | 2465 | |
fa96cb38 PA |
2466 | /* Make sure SIGCHLD is blocked until the sigsuspend below. Block |
2467 | all signals while here. */ | |
2468 | sigfillset (&block_mask); | |
21987b9c | 2469 | gdb_sigmask (SIG_BLOCK, &block_mask, &prev_mask); |
fa96cb38 | 2470 | |
582511be PA |
2471 | /* Always pull all events out of the kernel. We'll randomly select |
2472 | an event LWP out of all that have events, to prevent | |
2473 | starvation. */ | |
fa96cb38 | 2474 | while (event_child == NULL) |
0d62e5e8 | 2475 | { |
fa96cb38 | 2476 | pid_t ret = 0; |
0d62e5e8 | 2477 | |
fa96cb38 PA |
2478 | /* Always use -1 and WNOHANG, due to couple of a kernel/ptrace |
2479 | quirks: | |
0d62e5e8 | 2480 | |
fa96cb38 PA |
2481 | - If the thread group leader exits while other threads in the |
2482 | thread group still exist, waitpid(TGID, ...) hangs. That | |
2483 | waitpid won't return an exit status until the other threads | |
2484 | in the group are reaped. | |
611cb4a5 | 2485 | |
fa96cb38 PA |
2486 | - When a non-leader thread execs, that thread just vanishes |
2487 | without reporting an exit (so we'd hang if we waited for it | |
2488 | explicitly in that case). The exec event is reported to | |
94585166 | 2489 | the TGID pid. */ |
fa96cb38 PA |
2490 | errno = 0; |
2491 | ret = my_waitpid (-1, wstatp, options | WNOHANG); | |
d8301ad1 | 2492 | |
c058728c SM |
2493 | threads_debug_printf ("waitpid(-1, ...) returned %d, %s", |
2494 | ret, errno ? safe_strerror (errno) : "ERRNO-OK"); | |
0d62e5e8 | 2495 | |
fa96cb38 | 2496 | if (ret > 0) |
0d62e5e8 | 2497 | { |
c058728c SM |
2498 | threads_debug_printf ("waitpid %ld received %s", |
2499 | (long) ret, status_to_str (*wstatp).c_str ()); | |
89be2091 | 2500 | |
582511be PA |
2501 | /* Filter all events. IOW, leave all events pending. We'll |
2502 | randomly select an event LWP out of all that have events | |
2503 | below. */ | |
d16f3f6c | 2504 | filter_event (ret, *wstatp); |
fa96cb38 PA |
2505 | /* Retry until nothing comes out of waitpid. A single |
2506 | SIGCHLD can indicate more than one child stopped. */ | |
89be2091 DJ |
2507 | continue; |
2508 | } | |
2509 | ||
20ba1ce6 PA |
2510 | /* Now that we've pulled all events out of the kernel, resume |
2511 | LWPs that don't have an interesting event to report. */ | |
2512 | if (stopping_threads == NOT_STOPPING_THREADS) | |
df95181f TBA |
2513 | for_each_thread ([this] (thread_info *thread) |
2514 | { | |
2515 | resume_stopped_resumed_lwps (thread); | |
2516 | }); | |
20ba1ce6 PA |
2517 | |
2518 | /* ... and find an LWP with a status to report to the core, if | |
2519 | any. */ | |
83e1b6c1 SM |
2520 | event_thread = find_thread_in_random ([&] (thread_info *thread) |
2521 | { | |
2522 | return status_pending_p_callback (thread, filter_ptid); | |
2523 | }); | |
2524 | ||
582511be PA |
2525 | if (event_thread != NULL) |
2526 | { | |
2527 | event_child = get_thread_lwp (event_thread); | |
2528 | *wstatp = event_child->status_pending; | |
2529 | event_child->status_pending_p = 0; | |
2530 | event_child->status_pending = 0; | |
2531 | break; | |
2532 | } | |
2533 | ||
fa96cb38 PA |
2534 | /* Check for zombie thread group leaders. Those can't be reaped |
2535 | until all other threads in the thread group are. */ | |
2536 | check_zombie_leaders (); | |
2537 | ||
a1385b7b SM |
2538 | auto not_stopped = [&] (thread_info *thread) |
2539 | { | |
2540 | return not_stopped_callback (thread, wait_ptid); | |
2541 | }; | |
2542 | ||
fa96cb38 PA |
2543 | /* If there are no resumed children left in the set of LWPs we |
2544 | want to wait for, bail. We can't just block in | |
2545 | waitpid/sigsuspend, because lwps might have been left stopped | |
2546 | in trace-stop state, and we'd be stuck forever waiting for | |
2547 | their status to change (which would only happen if we resumed | |
2548 | them). Even if WNOHANG is set, this return code is preferred | |
2549 | over 0 (below), as it is more detailed. */ | |
a1385b7b | 2550 | if (find_thread (not_stopped) == NULL) |
a6dbe5df | 2551 | { |
c058728c SM |
2552 | threads_debug_printf ("exit (no unwaited-for LWP)"); |
2553 | ||
21987b9c | 2554 | gdb_sigmask (SIG_SETMASK, &prev_mask, NULL); |
fa96cb38 | 2555 | return -1; |
a6dbe5df PA |
2556 | } |
2557 | ||
fa96cb38 PA |
2558 | /* No interesting event to report to the caller. */ |
2559 | if ((options & WNOHANG)) | |
24a09b5f | 2560 | { |
c058728c | 2561 | threads_debug_printf ("WNOHANG set, no event found"); |
fa96cb38 | 2562 | |
21987b9c | 2563 | gdb_sigmask (SIG_SETMASK, &prev_mask, NULL); |
fa96cb38 | 2564 | return 0; |
24a09b5f DJ |
2565 | } |
2566 | ||
fa96cb38 | 2567 | /* Block until we get an event reported with SIGCHLD. */ |
c058728c | 2568 | threads_debug_printf ("sigsuspend'ing"); |
d50171e4 | 2569 | |
fa96cb38 | 2570 | sigsuspend (&prev_mask); |
21987b9c | 2571 | gdb_sigmask (SIG_SETMASK, &prev_mask, NULL); |
fa96cb38 PA |
2572 | goto retry; |
2573 | } | |
d50171e4 | 2574 | |
21987b9c | 2575 | gdb_sigmask (SIG_SETMASK, &prev_mask, NULL); |
d50171e4 | 2576 | |
24583e45 | 2577 | switch_to_thread (event_thread); |
d50171e4 | 2578 | |
fa96cb38 PA |
2579 | return lwpid_of (event_thread); |
2580 | } | |
2581 | ||
d16f3f6c TBA |
2582 | int |
2583 | linux_process_target::wait_for_event (ptid_t ptid, int *wstatp, int options) | |
fa96cb38 | 2584 | { |
d16f3f6c | 2585 | return wait_for_event_filtered (ptid, ptid, wstatp, options); |
611cb4a5 DJ |
2586 | } |
2587 | ||
6bf5e0ba PA |
2588 | /* Select one LWP out of those that have events pending. */ |
2589 | ||
2590 | static void | |
2591 | select_event_lwp (struct lwp_info **orig_lp) | |
2592 | { | |
582511be PA |
2593 | struct thread_info *event_thread = NULL; |
2594 | ||
2595 | /* In all-stop, give preference to the LWP that is being | |
2596 | single-stepped. There will be at most one, and it's the LWP that | |
2597 | the core is most interested in. If we didn't do this, then we'd | |
2598 | have to handle pending step SIGTRAPs somehow in case the core | |
2599 | later continues the previously-stepped thread, otherwise we'd | |
2600 | report the pending SIGTRAP, and the core, not having stepped the | |
2601 | thread, wouldn't understand what the trap was for, and therefore | |
2602 | would report it to the user as a random signal. */ | |
2603 | if (!non_stop) | |
6bf5e0ba | 2604 | { |
39a64da5 SM |
2605 | event_thread = find_thread ([] (thread_info *thread) |
2606 | { | |
2607 | lwp_info *lp = get_thread_lwp (thread); | |
2608 | ||
183be222 | 2609 | return (thread->last_status.kind () == TARGET_WAITKIND_IGNORE |
39a64da5 SM |
2610 | && thread->last_resume_kind == resume_step |
2611 | && lp->status_pending_p); | |
2612 | }); | |
2613 | ||
582511be | 2614 | if (event_thread != NULL) |
c058728c SM |
2615 | threads_debug_printf |
2616 | ("Select single-step %s", | |
2617 | target_pid_to_str (ptid_of (event_thread)).c_str ()); | |
6bf5e0ba | 2618 | } |
582511be | 2619 | if (event_thread == NULL) |
6bf5e0ba PA |
2620 | { |
2621 | /* No single-stepping LWP. Select one at random, out of those | |
dda83cd7 | 2622 | which have had events. */ |
6bf5e0ba | 2623 | |
b0319eaa | 2624 | event_thread = find_thread_in_random ([&] (thread_info *thread) |
39a64da5 SM |
2625 | { |
2626 | lwp_info *lp = get_thread_lwp (thread); | |
2627 | ||
b0319eaa | 2628 | /* Only resumed LWPs that have an event pending. */ |
183be222 | 2629 | return (thread->last_status.kind () == TARGET_WAITKIND_IGNORE |
b0319eaa | 2630 | && lp->status_pending_p); |
39a64da5 | 2631 | }); |
6bf5e0ba PA |
2632 | } |
2633 | ||
d86d4aaf | 2634 | if (event_thread != NULL) |
6bf5e0ba | 2635 | { |
d86d4aaf DE |
2636 | struct lwp_info *event_lp = get_thread_lwp (event_thread); |
2637 | ||
6bf5e0ba PA |
2638 | /* Switch the event LWP. */ |
2639 | *orig_lp = event_lp; | |
2640 | } | |
2641 | } | |
2642 | ||
7984d532 PA |
2643 | /* Decrement the suspend count of all LWPs, except EXCEPT, if non |
2644 | NULL. */ | |
2645 | ||
2646 | static void | |
2647 | unsuspend_all_lwps (struct lwp_info *except) | |
2648 | { | |
139720c5 SM |
2649 | for_each_thread ([&] (thread_info *thread) |
2650 | { | |
2651 | lwp_info *lwp = get_thread_lwp (thread); | |
2652 | ||
2653 | if (lwp != except) | |
2654 | lwp_suspended_decr (lwp); | |
2655 | }); | |
7984d532 PA |
2656 | } |
2657 | ||
5a6b0a41 | 2658 | static bool lwp_running (thread_info *thread); |
fa593d66 PA |
2659 | |
2660 | /* Stabilize threads (move out of jump pads). | |
2661 | ||
2662 | If a thread is midway collecting a fast tracepoint, we need to | |
2663 | finish the collection and move it out of the jump pad before | |
2664 | reporting the signal. | |
2665 | ||
2666 | This avoids recursion while collecting (when a signal arrives | |
2667 | midway, and the signal handler itself collects), which would trash | |
2668 | the trace buffer. In case the user set a breakpoint in a signal | |
2669 | handler, this avoids the backtrace showing the jump pad, etc.. | |
2670 | Most importantly, there are certain things we can't do safely if | |
2671 | threads are stopped in a jump pad (or in its callee's). For | |
2672 | example: | |
2673 | ||
2674 | - starting a new trace run. A thread still collecting the | |
2675 | previous run, could trash the trace buffer when resumed. The trace | |
2676 | buffer control structures would have been reset but the thread had | |
2677 | no way to tell. The thread could even midway memcpy'ing to the | |
2678 | buffer, which would mean that when resumed, it would clobber the | |
2679 | trace buffer that had been set for a new run. | |
2680 | ||
2681 | - we can't rewrite/reuse the jump pads for new tracepoints | |
2682 | safely. Say you do tstart while a thread is stopped midway while | |
2683 | collecting. When the thread is later resumed, it finishes the | |
2684 | collection, and returns to the jump pad, to execute the original | |
2685 | instruction that was under the tracepoint jump at the time the | |
2686 | older run had been started. If the jump pad had been rewritten | |
2687 | since for something else in the new run, the thread would now | |
2688 | execute the wrong / random instructions. */ | |
2689 | ||
5c9eb2f2 TBA |
2690 | void |
2691 | linux_process_target::stabilize_threads () | |
fa593d66 | 2692 | { |
13e567af TBA |
2693 | thread_info *thread_stuck = find_thread ([this] (thread_info *thread) |
2694 | { | |
2695 | return stuck_in_jump_pad (thread); | |
2696 | }); | |
fa593d66 | 2697 | |
d86d4aaf | 2698 | if (thread_stuck != NULL) |
fa593d66 | 2699 | { |
c058728c SM |
2700 | threads_debug_printf ("can't stabilize, LWP %ld is stuck in jump pad", |
2701 | lwpid_of (thread_stuck)); | |
fa593d66 PA |
2702 | return; |
2703 | } | |
2704 | ||
24583e45 | 2705 | scoped_restore_current_thread restore_thread; |
fa593d66 PA |
2706 | |
2707 | stabilizing_threads = 1; | |
2708 | ||
2709 | /* Kick 'em all. */ | |
d16f3f6c TBA |
2710 | for_each_thread ([this] (thread_info *thread) |
2711 | { | |
2712 | move_out_of_jump_pad (thread); | |
2713 | }); | |
fa593d66 PA |
2714 | |
2715 | /* Loop until all are stopped out of the jump pads. */ | |
5a6b0a41 | 2716 | while (find_thread (lwp_running) != NULL) |
fa593d66 PA |
2717 | { |
2718 | struct target_waitstatus ourstatus; | |
2719 | struct lwp_info *lwp; | |
fa593d66 PA |
2720 | int wstat; |
2721 | ||
2722 | /* Note that we go through the full wait even loop. While | |
2723 | moving threads out of jump pad, we need to be able to step | |
2724 | over internal breakpoints and such. */ | |
d16f3f6c | 2725 | wait_1 (minus_one_ptid, &ourstatus, 0); |
fa593d66 | 2726 | |
183be222 | 2727 | if (ourstatus.kind () == TARGET_WAITKIND_STOPPED) |
fa593d66 | 2728 | { |
0bfdf32f | 2729 | lwp = get_thread_lwp (current_thread); |
fa593d66 PA |
2730 | |
2731 | /* Lock it. */ | |
863d01bd | 2732 | lwp_suspended_inc (lwp); |
fa593d66 | 2733 | |
183be222 | 2734 | if (ourstatus.sig () != GDB_SIGNAL_0 |
0bfdf32f | 2735 | || current_thread->last_resume_kind == resume_stop) |
fa593d66 | 2736 | { |
183be222 | 2737 | wstat = W_STOPCODE (gdb_signal_to_host (ourstatus.sig ())); |
fa593d66 PA |
2738 | enqueue_one_deferred_signal (lwp, &wstat); |
2739 | } | |
2740 | } | |
2741 | } | |
2742 | ||
fcdad592 | 2743 | unsuspend_all_lwps (NULL); |
fa593d66 PA |
2744 | |
2745 | stabilizing_threads = 0; | |
2746 | ||
b4d51a55 | 2747 | if (debug_threads) |
fa593d66 | 2748 | { |
13e567af TBA |
2749 | thread_stuck = find_thread ([this] (thread_info *thread) |
2750 | { | |
2751 | return stuck_in_jump_pad (thread); | |
2752 | }); | |
fcb056a5 | 2753 | |
d86d4aaf | 2754 | if (thread_stuck != NULL) |
c058728c SM |
2755 | threads_debug_printf |
2756 | ("couldn't stabilize, LWP %ld got stuck in jump pad", | |
2757 | lwpid_of (thread_stuck)); | |
fa593d66 PA |
2758 | } |
2759 | } | |
2760 | ||
582511be PA |
2761 | /* Convenience function that is called when the kernel reports an |
2762 | event that is not passed out to GDB. */ | |
2763 | ||
2764 | static ptid_t | |
2765 | ignore_event (struct target_waitstatus *ourstatus) | |
2766 | { | |
2767 | /* If we got an event, there may still be others, as a single | |
2768 | SIGCHLD can indicate more than one child stopped. This forces | |
2769 | another target_wait call. */ | |
2770 | async_file_mark (); | |
2771 | ||
183be222 | 2772 | ourstatus->set_ignore (); |
582511be PA |
2773 | return null_ptid; |
2774 | } | |
2775 | ||
fd000fb3 TBA |
2776 | ptid_t |
2777 | linux_process_target::filter_exit_event (lwp_info *event_child, | |
2778 | target_waitstatus *ourstatus) | |
65706a29 | 2779 | { |
c12a5089 | 2780 | client_state &cs = get_client_state (); |
65706a29 PA |
2781 | struct thread_info *thread = get_lwp_thread (event_child); |
2782 | ptid_t ptid = ptid_of (thread); | |
2783 | ||
2784 | if (!last_thread_of_process_p (pid_of (thread))) | |
2785 | { | |
c12a5089 | 2786 | if (cs.report_thread_events) |
183be222 | 2787 | ourstatus->set_thread_exited (0); |
65706a29 | 2788 | else |
183be222 | 2789 | ourstatus->set_ignore (); |
65706a29 PA |
2790 | |
2791 | delete_lwp (event_child); | |
2792 | } | |
2793 | return ptid; | |
2794 | } | |
2795 | ||
82075af2 JS |
2796 | /* Returns 1 if GDB is interested in any event_child syscalls. */ |
2797 | ||
2798 | static int | |
2799 | gdb_catching_syscalls_p (struct lwp_info *event_child) | |
2800 | { | |
2801 | struct thread_info *thread = get_lwp_thread (event_child); | |
2802 | struct process_info *proc = get_thread_process (thread); | |
2803 | ||
f27866ba | 2804 | return !proc->syscalls_to_catch.empty (); |
82075af2 JS |
2805 | } |
2806 | ||
9eedd27d TBA |
2807 | bool |
2808 | linux_process_target::gdb_catch_this_syscall (lwp_info *event_child) | |
82075af2 | 2809 | { |
4cc32bec | 2810 | int sysno; |
82075af2 JS |
2811 | struct thread_info *thread = get_lwp_thread (event_child); |
2812 | struct process_info *proc = get_thread_process (thread); | |
2813 | ||
f27866ba | 2814 | if (proc->syscalls_to_catch.empty ()) |
9eedd27d | 2815 | return false; |
82075af2 | 2816 | |
f27866ba | 2817 | if (proc->syscalls_to_catch[0] == ANY_SYSCALL) |
9eedd27d | 2818 | return true; |
82075af2 | 2819 | |
4cc32bec | 2820 | get_syscall_trapinfo (event_child, &sysno); |
f27866ba SM |
2821 | |
2822 | for (int iter : proc->syscalls_to_catch) | |
82075af2 | 2823 | if (iter == sysno) |
9eedd27d | 2824 | return true; |
82075af2 | 2825 | |
9eedd27d | 2826 | return false; |
82075af2 JS |
2827 | } |
2828 | ||
d16f3f6c TBA |
2829 | ptid_t |
2830 | linux_process_target::wait_1 (ptid_t ptid, target_waitstatus *ourstatus, | |
b60cea74 | 2831 | target_wait_flags target_options) |
da6d8c04 | 2832 | { |
c058728c SM |
2833 | THREADS_SCOPED_DEBUG_ENTER_EXIT; |
2834 | ||
c12a5089 | 2835 | client_state &cs = get_client_state (); |
e5f1222d | 2836 | int w; |
fc7238bb | 2837 | struct lwp_info *event_child; |
bd99dc85 | 2838 | int options; |
bd99dc85 | 2839 | int pid; |
6bf5e0ba PA |
2840 | int step_over_finished; |
2841 | int bp_explains_trap; | |
2842 | int maybe_internal_trap; | |
2843 | int report_to_gdb; | |
219f2f23 | 2844 | int trace_event; |
c2d6af84 | 2845 | int in_step_range; |
f2faf941 | 2846 | int any_resumed; |
bd99dc85 | 2847 | |
c058728c | 2848 | threads_debug_printf ("[%s]", target_pid_to_str (ptid).c_str ()); |
87ce2a04 | 2849 | |
bd99dc85 PA |
2850 | /* Translate generic target options into linux options. */ |
2851 | options = __WALL; | |
2852 | if (target_options & TARGET_WNOHANG) | |
2853 | options |= WNOHANG; | |
0d62e5e8 | 2854 | |
fa593d66 PA |
2855 | bp_explains_trap = 0; |
2856 | trace_event = 0; | |
c2d6af84 | 2857 | in_step_range = 0; |
183be222 | 2858 | ourstatus->set_ignore (); |
bd99dc85 | 2859 | |
83e1b6c1 SM |
2860 | auto status_pending_p_any = [&] (thread_info *thread) |
2861 | { | |
2862 | return status_pending_p_callback (thread, minus_one_ptid); | |
2863 | }; | |
2864 | ||
a1385b7b SM |
2865 | auto not_stopped = [&] (thread_info *thread) |
2866 | { | |
2867 | return not_stopped_callback (thread, minus_one_ptid); | |
2868 | }; | |
2869 | ||
f2faf941 | 2870 | /* Find a resumed LWP, if any. */ |
83e1b6c1 | 2871 | if (find_thread (status_pending_p_any) != NULL) |
f2faf941 | 2872 | any_resumed = 1; |
a1385b7b | 2873 | else if (find_thread (not_stopped) != NULL) |
f2faf941 PA |
2874 | any_resumed = 1; |
2875 | else | |
2876 | any_resumed = 0; | |
2877 | ||
d7e15655 | 2878 | if (step_over_bkpt == null_ptid) |
d16f3f6c | 2879 | pid = wait_for_event (ptid, &w, options); |
6bf5e0ba PA |
2880 | else |
2881 | { | |
c058728c SM |
2882 | threads_debug_printf ("step_over_bkpt set [%s], doing a blocking wait", |
2883 | target_pid_to_str (step_over_bkpt).c_str ()); | |
d16f3f6c | 2884 | pid = wait_for_event (step_over_bkpt, &w, options & ~WNOHANG); |
6bf5e0ba PA |
2885 | } |
2886 | ||
f2faf941 | 2887 | if (pid == 0 || (pid == -1 && !any_resumed)) |
87ce2a04 | 2888 | { |
fa96cb38 PA |
2889 | gdb_assert (target_options & TARGET_WNOHANG); |
2890 | ||
c058728c | 2891 | threads_debug_printf ("ret = null_ptid, TARGET_WAITKIND_IGNORE"); |
fa96cb38 | 2892 | |
183be222 | 2893 | ourstatus->set_ignore (); |
87ce2a04 DE |
2894 | return null_ptid; |
2895 | } | |
fa96cb38 PA |
2896 | else if (pid == -1) |
2897 | { | |
c058728c | 2898 | threads_debug_printf ("ret = null_ptid, TARGET_WAITKIND_NO_RESUMED"); |
bd99dc85 | 2899 | |
183be222 | 2900 | ourstatus->set_no_resumed (); |
fa96cb38 PA |
2901 | return null_ptid; |
2902 | } | |
0d62e5e8 | 2903 | |
0bfdf32f | 2904 | event_child = get_thread_lwp (current_thread); |
0d62e5e8 | 2905 | |
d16f3f6c | 2906 | /* wait_for_event only returns an exit status for the last |
fa96cb38 PA |
2907 | child of a process. Report it. */ |
2908 | if (WIFEXITED (w) || WIFSIGNALED (w)) | |
da6d8c04 | 2909 | { |
fa96cb38 | 2910 | if (WIFEXITED (w)) |
0d62e5e8 | 2911 | { |
183be222 | 2912 | ourstatus->set_exited (WEXITSTATUS (w)); |
bd99dc85 | 2913 | |
c058728c SM |
2914 | threads_debug_printf |
2915 | ("ret = %s, exited with retcode %d", | |
2916 | target_pid_to_str (ptid_of (current_thread)).c_str (), | |
2917 | WEXITSTATUS (w)); | |
fa96cb38 PA |
2918 | } |
2919 | else | |
2920 | { | |
183be222 | 2921 | ourstatus->set_signalled (gdb_signal_from_host (WTERMSIG (w))); |
5b1c542e | 2922 | |
c058728c SM |
2923 | threads_debug_printf |
2924 | ("ret = %s, terminated with signal %d", | |
2925 | target_pid_to_str (ptid_of (current_thread)).c_str (), | |
2926 | WTERMSIG (w)); | |
0d62e5e8 | 2927 | } |
fa96cb38 | 2928 | |
183be222 | 2929 | if (ourstatus->kind () == TARGET_WAITKIND_EXITED) |
65706a29 PA |
2930 | return filter_exit_event (event_child, ourstatus); |
2931 | ||
0bfdf32f | 2932 | return ptid_of (current_thread); |
da6d8c04 DJ |
2933 | } |
2934 | ||
2d97cd35 AT |
2935 | /* If step-over executes a breakpoint instruction, in the case of a |
2936 | hardware single step it means a gdb/gdbserver breakpoint had been | |
2937 | planted on top of a permanent breakpoint, in the case of a software | |
2938 | single step it may just mean that gdbserver hit the reinsert breakpoint. | |
e7ad2f14 | 2939 | The PC has been adjusted by save_stop_reason to point at |
2d97cd35 AT |
2940 | the breakpoint address. |
2941 | So in the case of the hardware single step advance the PC manually | |
2942 | past the breakpoint and in the case of software single step advance only | |
3b9a79ef | 2943 | if it's not the single_step_breakpoint we are hitting. |
2d97cd35 AT |
2944 | This avoids that a program would keep trapping a permanent breakpoint |
2945 | forever. */ | |
d7e15655 | 2946 | if (step_over_bkpt != null_ptid |
2d97cd35 AT |
2947 | && event_child->stop_reason == TARGET_STOPPED_BY_SW_BREAKPOINT |
2948 | && (event_child->stepping | |
3b9a79ef | 2949 | || !single_step_breakpoint_inserted_here (event_child->stop_pc))) |
8090aef2 | 2950 | { |
dd373349 AT |
2951 | int increment_pc = 0; |
2952 | int breakpoint_kind = 0; | |
2953 | CORE_ADDR stop_pc = event_child->stop_pc; | |
2954 | ||
d16f3f6c TBA |
2955 | breakpoint_kind = breakpoint_kind_from_current_state (&stop_pc); |
2956 | sw_breakpoint_from_kind (breakpoint_kind, &increment_pc); | |
8090aef2 | 2957 | |
c058728c SM |
2958 | threads_debug_printf |
2959 | ("step-over for %s executed software breakpoint", | |
2960 | target_pid_to_str (ptid_of (current_thread)).c_str ()); | |
8090aef2 PA |
2961 | |
2962 | if (increment_pc != 0) | |
2963 | { | |
2964 | struct regcache *regcache | |
2965 | = get_thread_regcache (current_thread, 1); | |
2966 | ||
2967 | event_child->stop_pc += increment_pc; | |
bf9ae9d8 | 2968 | low_set_pc (regcache, event_child->stop_pc); |
8090aef2 | 2969 | |
d7146cda | 2970 | if (!low_breakpoint_at (event_child->stop_pc)) |
15c66dd6 | 2971 | event_child->stop_reason = TARGET_STOPPED_BY_NO_REASON; |
8090aef2 PA |
2972 | } |
2973 | } | |
2974 | ||
6bf5e0ba PA |
2975 | /* If this event was not handled before, and is not a SIGTRAP, we |
2976 | report it. SIGILL and SIGSEGV are also treated as traps in case | |
2977 | a breakpoint is inserted at the current PC. If this target does | |
2978 | not support internal breakpoints at all, we also report the | |
2979 | SIGTRAP without further processing; it's of no concern to us. */ | |
2980 | maybe_internal_trap | |
bf9ae9d8 | 2981 | = (low_supports_breakpoints () |
6bf5e0ba PA |
2982 | && (WSTOPSIG (w) == SIGTRAP |
2983 | || ((WSTOPSIG (w) == SIGILL | |
2984 | || WSTOPSIG (w) == SIGSEGV) | |
d7146cda | 2985 | && low_breakpoint_at (event_child->stop_pc)))); |
6bf5e0ba PA |
2986 | |
2987 | if (maybe_internal_trap) | |
2988 | { | |
2989 | /* Handle anything that requires bookkeeping before deciding to | |
2990 | report the event or continue waiting. */ | |
2991 | ||
2992 | /* First check if we can explain the SIGTRAP with an internal | |
2993 | breakpoint, or if we should possibly report the event to GDB. | |
2994 | Do this before anything that may remove or insert a | |
2995 | breakpoint. */ | |
2996 | bp_explains_trap = breakpoint_inserted_here (event_child->stop_pc); | |
2997 | ||
2998 | /* We have a SIGTRAP, possibly a step-over dance has just | |
2999 | finished. If so, tweak the state machine accordingly, | |
3b9a79ef YQ |
3000 | reinsert breakpoints and delete any single-step |
3001 | breakpoints. */ | |
6bf5e0ba PA |
3002 | step_over_finished = finish_step_over (event_child); |
3003 | ||
3004 | /* Now invoke the callbacks of any internal breakpoints there. */ | |
3005 | check_breakpoints (event_child->stop_pc); | |
3006 | ||
219f2f23 PA |
3007 | /* Handle tracepoint data collecting. This may overflow the |
3008 | trace buffer, and cause a tracing stop, removing | |
3009 | breakpoints. */ | |
3010 | trace_event = handle_tracepoints (event_child); | |
3011 | ||
6bf5e0ba | 3012 | if (bp_explains_trap) |
c058728c | 3013 | threads_debug_printf ("Hit a gdbserver breakpoint."); |
6bf5e0ba PA |
3014 | } |
3015 | else | |
3016 | { | |
3017 | /* We have some other signal, possibly a step-over dance was in | |
3018 | progress, and it should be cancelled too. */ | |
3019 | step_over_finished = finish_step_over (event_child); | |
fa593d66 PA |
3020 | } |
3021 | ||
3022 | /* We have all the data we need. Either report the event to GDB, or | |
3023 | resume threads and keep waiting for more. */ | |
3024 | ||
3025 | /* If we're collecting a fast tracepoint, finish the collection and | |
3026 | move out of the jump pad before delivering a signal. See | |
3027 | linux_stabilize_threads. */ | |
3028 | ||
3029 | if (WIFSTOPPED (w) | |
3030 | && WSTOPSIG (w) != SIGTRAP | |
3031 | && supports_fast_tracepoints () | |
58b4daa5 | 3032 | && agent_loaded_p ()) |
fa593d66 | 3033 | { |
c058728c SM |
3034 | threads_debug_printf ("Got signal %d for LWP %ld. Check if we need " |
3035 | "to defer or adjust it.", | |
3036 | WSTOPSIG (w), lwpid_of (current_thread)); | |
fa593d66 PA |
3037 | |
3038 | /* Allow debugging the jump pad itself. */ | |
0bfdf32f | 3039 | if (current_thread->last_resume_kind != resume_step |
fa593d66 PA |
3040 | && maybe_move_out_of_jump_pad (event_child, &w)) |
3041 | { | |
3042 | enqueue_one_deferred_signal (event_child, &w); | |
3043 | ||
c058728c SM |
3044 | threads_debug_printf ("Signal %d for LWP %ld deferred (in jump pad)", |
3045 | WSTOPSIG (w), lwpid_of (current_thread)); | |
fa593d66 | 3046 | |
df95181f | 3047 | resume_one_lwp (event_child, 0, 0, NULL); |
582511be PA |
3048 | |
3049 | return ignore_event (ourstatus); | |
fa593d66 PA |
3050 | } |
3051 | } | |
219f2f23 | 3052 | |
229d26fc SM |
3053 | if (event_child->collecting_fast_tracepoint |
3054 | != fast_tpoint_collect_result::not_collecting) | |
fa593d66 | 3055 | { |
c058728c SM |
3056 | threads_debug_printf |
3057 | ("LWP %ld was trying to move out of the jump pad (%d). " | |
3058 | "Check if we're already there.", | |
3059 | lwpid_of (current_thread), | |
3060 | (int) event_child->collecting_fast_tracepoint); | |
fa593d66 PA |
3061 | |
3062 | trace_event = 1; | |
3063 | ||
3064 | event_child->collecting_fast_tracepoint | |
3065 | = linux_fast_tracepoint_collecting (event_child, NULL); | |
3066 | ||
229d26fc SM |
3067 | if (event_child->collecting_fast_tracepoint |
3068 | != fast_tpoint_collect_result::before_insn) | |
fa593d66 PA |
3069 | { |
3070 | /* No longer need this breakpoint. */ | |
3071 | if (event_child->exit_jump_pad_bkpt != NULL) | |
3072 | { | |
c058728c SM |
3073 | threads_debug_printf |
3074 | ("No longer need exit-jump-pad bkpt; removing it." | |
3075 | "stopping all threads momentarily."); | |
fa593d66 PA |
3076 | |
3077 | /* Other running threads could hit this breakpoint. | |
3078 | We don't handle moribund locations like GDB does, | |
3079 | instead we always pause all threads when removing | |
3080 | breakpoints, so that any step-over or | |
3081 | decr_pc_after_break adjustment is always taken | |
3082 | care of while the breakpoint is still | |
3083 | inserted. */ | |
3084 | stop_all_lwps (1, event_child); | |
fa593d66 PA |
3085 | |
3086 | delete_breakpoint (event_child->exit_jump_pad_bkpt); | |
3087 | event_child->exit_jump_pad_bkpt = NULL; | |
3088 | ||
3089 | unstop_all_lwps (1, event_child); | |
3090 | ||
3091 | gdb_assert (event_child->suspended >= 0); | |
3092 | } | |
3093 | } | |
3094 | ||
229d26fc SM |
3095 | if (event_child->collecting_fast_tracepoint |
3096 | == fast_tpoint_collect_result::not_collecting) | |
fa593d66 | 3097 | { |
c058728c SM |
3098 | threads_debug_printf |
3099 | ("fast tracepoint finished collecting successfully."); | |
fa593d66 PA |
3100 | |
3101 | /* We may have a deferred signal to report. */ | |
3102 | if (dequeue_one_deferred_signal (event_child, &w)) | |
c058728c | 3103 | threads_debug_printf ("dequeued one signal."); |
3c11dd79 | 3104 | else |
fa593d66 | 3105 | { |
c058728c | 3106 | threads_debug_printf ("no deferred signals."); |
fa593d66 PA |
3107 | |
3108 | if (stabilizing_threads) | |
3109 | { | |
183be222 | 3110 | ourstatus->set_stopped (GDB_SIGNAL_0); |
87ce2a04 | 3111 | |
c058728c SM |
3112 | threads_debug_printf |
3113 | ("ret = %s, stopped while stabilizing threads", | |
3114 | target_pid_to_str (ptid_of (current_thread)).c_str ()); | |
87ce2a04 | 3115 | |
0bfdf32f | 3116 | return ptid_of (current_thread); |
fa593d66 PA |
3117 | } |
3118 | } | |
3119 | } | |
6bf5e0ba PA |
3120 | } |
3121 | ||
e471f25b PA |
3122 | /* Check whether GDB would be interested in this event. */ |
3123 | ||
82075af2 JS |
3124 | /* Check if GDB is interested in this syscall. */ |
3125 | if (WIFSTOPPED (w) | |
3126 | && WSTOPSIG (w) == SYSCALL_SIGTRAP | |
9eedd27d | 3127 | && !gdb_catch_this_syscall (event_child)) |
82075af2 | 3128 | { |
c058728c SM |
3129 | threads_debug_printf ("Ignored syscall for LWP %ld.", |
3130 | lwpid_of (current_thread)); | |
82075af2 | 3131 | |
df95181f | 3132 | resume_one_lwp (event_child, event_child->stepping, 0, NULL); |
edeeb602 | 3133 | |
82075af2 JS |
3134 | return ignore_event (ourstatus); |
3135 | } | |
3136 | ||
e471f25b PA |
3137 | /* If GDB is not interested in this signal, don't stop other |
3138 | threads, and don't report it to GDB. Just resume the inferior | |
3139 | right away. We do this for threading-related signals as well as | |
3140 | any that GDB specifically requested we ignore. But never ignore | |
3141 | SIGSTOP if we sent it ourselves, and do not ignore signals when | |
3142 | stepping - they may require special handling to skip the signal | |
c9587f88 AT |
3143 | handler. Also never ignore signals that could be caused by a |
3144 | breakpoint. */ | |
e471f25b | 3145 | if (WIFSTOPPED (w) |
0bfdf32f | 3146 | && current_thread->last_resume_kind != resume_step |
e471f25b | 3147 | && ( |
1a981360 | 3148 | #if defined (USE_THREAD_DB) && !defined (__ANDROID__) |
fe978cb0 | 3149 | (current_process ()->priv->thread_db != NULL |
e471f25b PA |
3150 | && (WSTOPSIG (w) == __SIGRTMIN |
3151 | || WSTOPSIG (w) == __SIGRTMIN + 1)) | |
3152 | || | |
3153 | #endif | |
c12a5089 | 3154 | (cs.pass_signals[gdb_signal_from_host (WSTOPSIG (w))] |
e471f25b | 3155 | && !(WSTOPSIG (w) == SIGSTOP |
c9587f88 AT |
3156 | && current_thread->last_resume_kind == resume_stop) |
3157 | && !linux_wstatus_maybe_breakpoint (w)))) | |
e471f25b PA |
3158 | { |
3159 | siginfo_t info, *info_p; | |
3160 | ||
c058728c SM |
3161 | threads_debug_printf ("Ignored signal %d for LWP %ld.", |
3162 | WSTOPSIG (w), lwpid_of (current_thread)); | |
e471f25b | 3163 | |
0bfdf32f | 3164 | if (ptrace (PTRACE_GETSIGINFO, lwpid_of (current_thread), |
b8e1b30e | 3165 | (PTRACE_TYPE_ARG3) 0, &info) == 0) |
e471f25b PA |
3166 | info_p = &info; |
3167 | else | |
3168 | info_p = NULL; | |
863d01bd PA |
3169 | |
3170 | if (step_over_finished) | |
3171 | { | |
3172 | /* We cancelled this thread's step-over above. We still | |
3173 | need to unsuspend all other LWPs, and set them back | |
3174 | running again while the signal handler runs. */ | |
3175 | unsuspend_all_lwps (event_child); | |
3176 | ||
3177 | /* Enqueue the pending signal info so that proceed_all_lwps | |
3178 | doesn't lose it. */ | |
3179 | enqueue_pending_signal (event_child, WSTOPSIG (w), info_p); | |
3180 | ||
3181 | proceed_all_lwps (); | |
3182 | } | |
3183 | else | |
3184 | { | |
df95181f TBA |
3185 | resume_one_lwp (event_child, event_child->stepping, |
3186 | WSTOPSIG (w), info_p); | |
863d01bd | 3187 | } |
edeeb602 | 3188 | |
582511be | 3189 | return ignore_event (ourstatus); |
e471f25b PA |
3190 | } |
3191 | ||
c2d6af84 PA |
3192 | /* Note that all addresses are always "out of the step range" when |
3193 | there's no range to begin with. */ | |
3194 | in_step_range = lwp_in_step_range (event_child); | |
3195 | ||
3196 | /* If GDB wanted this thread to single step, and the thread is out | |
3197 | of the step range, we always want to report the SIGTRAP, and let | |
3198 | GDB handle it. Watchpoints should always be reported. So should | |
3199 | signals we can't explain. A SIGTRAP we can't explain could be a | |
3200 | GDB breakpoint --- we may or not support Z0 breakpoints. If we | |
3201 | do, we're be able to handle GDB breakpoints on top of internal | |
3202 | breakpoints, by handling the internal breakpoint and still | |
3203 | reporting the event to GDB. If we don't, we're out of luck, GDB | |
863d01bd PA |
3204 | won't see the breakpoint hit. If we see a single-step event but |
3205 | the thread should be continuing, don't pass the trap to gdb. | |
3206 | That indicates that we had previously finished a single-step but | |
3207 | left the single-step pending -- see | |
3208 | complete_ongoing_step_over. */ | |
6bf5e0ba | 3209 | report_to_gdb = (!maybe_internal_trap |
0bfdf32f | 3210 | || (current_thread->last_resume_kind == resume_step |
c2d6af84 | 3211 | && !in_step_range) |
15c66dd6 | 3212 | || event_child->stop_reason == TARGET_STOPPED_BY_WATCHPOINT |
863d01bd PA |
3213 | || (!in_step_range |
3214 | && !bp_explains_trap | |
3215 | && !trace_event | |
3216 | && !step_over_finished | |
3217 | && !(current_thread->last_resume_kind == resume_continue | |
3218 | && event_child->stop_reason == TARGET_STOPPED_BY_SINGLE_STEP)) | |
9f3a5c85 | 3219 | || (gdb_breakpoint_here (event_child->stop_pc) |
d3ce09f5 | 3220 | && gdb_condition_true_at_breakpoint (event_child->stop_pc) |
de0d863e | 3221 | && gdb_no_commands_at_breakpoint (event_child->stop_pc)) |
183be222 | 3222 | || event_child->waitstatus.kind () != TARGET_WAITKIND_IGNORE); |
d3ce09f5 SS |
3223 | |
3224 | run_breakpoint_commands (event_child->stop_pc); | |
6bf5e0ba PA |
3225 | |
3226 | /* We found no reason GDB would want us to stop. We either hit one | |
3227 | of our own breakpoints, or finished an internal step GDB | |
3228 | shouldn't know about. */ | |
3229 | if (!report_to_gdb) | |
3230 | { | |
c058728c SM |
3231 | if (bp_explains_trap) |
3232 | threads_debug_printf ("Hit a gdbserver breakpoint."); | |
3233 | ||
3234 | if (step_over_finished) | |
3235 | threads_debug_printf ("Step-over finished."); | |
3236 | ||
3237 | if (trace_event) | |
3238 | threads_debug_printf ("Tracepoint event."); | |
3239 | ||
3240 | if (lwp_in_step_range (event_child)) | |
3241 | threads_debug_printf ("Range stepping pc 0x%s [0x%s, 0x%s).", | |
3242 | paddress (event_child->stop_pc), | |
3243 | paddress (event_child->step_range_start), | |
3244 | paddress (event_child->step_range_end)); | |
6bf5e0ba PA |
3245 | |
3246 | /* We're not reporting this breakpoint to GDB, so apply the | |
3247 | decr_pc_after_break adjustment to the inferior's regcache | |
3248 | ourselves. */ | |
3249 | ||
bf9ae9d8 | 3250 | if (low_supports_breakpoints ()) |
6bf5e0ba PA |
3251 | { |
3252 | struct regcache *regcache | |
0bfdf32f | 3253 | = get_thread_regcache (current_thread, 1); |
bf9ae9d8 | 3254 | low_set_pc (regcache, event_child->stop_pc); |
6bf5e0ba PA |
3255 | } |
3256 | ||
7984d532 | 3257 | if (step_over_finished) |
e3652c84 YQ |
3258 | { |
3259 | /* If we have finished stepping over a breakpoint, we've | |
3260 | stopped and suspended all LWPs momentarily except the | |
3261 | stepping one. This is where we resume them all again. | |
3262 | We're going to keep waiting, so use proceed, which | |
3263 | handles stepping over the next breakpoint. */ | |
3264 | unsuspend_all_lwps (event_child); | |
3265 | } | |
3266 | else | |
3267 | { | |
3268 | /* Remove the single-step breakpoints if any. Note that | |
3269 | there isn't single-step breakpoint if we finished stepping | |
3270 | over. */ | |
7582c77c | 3271 | if (supports_software_single_step () |
e3652c84 YQ |
3272 | && has_single_step_breakpoints (current_thread)) |
3273 | { | |
3274 | stop_all_lwps (0, event_child); | |
3275 | delete_single_step_breakpoints (current_thread); | |
3276 | unstop_all_lwps (0, event_child); | |
3277 | } | |
3278 | } | |
7984d532 | 3279 | |
c058728c | 3280 | threads_debug_printf ("proceeding all threads."); |
edeeb602 | 3281 | |
c058728c | 3282 | proceed_all_lwps (); |
edeeb602 | 3283 | |
582511be | 3284 | return ignore_event (ourstatus); |
6bf5e0ba PA |
3285 | } |
3286 | ||
c058728c SM |
3287 | if (debug_threads) |
3288 | { | |
3289 | if (event_child->waitstatus.kind () != TARGET_WAITKIND_IGNORE) | |
3290 | threads_debug_printf ("LWP %ld: extended event with waitstatus %s", | |
3291 | lwpid_of (get_lwp_thread (event_child)), | |
3292 | event_child->waitstatus.to_string ().c_str ()); | |
3293 | ||
3294 | if (current_thread->last_resume_kind == resume_step) | |
3295 | { | |
3296 | if (event_child->step_range_start == event_child->step_range_end) | |
3297 | threads_debug_printf | |
3298 | ("GDB wanted to single-step, reporting event."); | |
3299 | else if (!lwp_in_step_range (event_child)) | |
3300 | threads_debug_printf ("Out of step range, reporting event."); | |
3301 | } | |
3302 | ||
3303 | if (event_child->stop_reason == TARGET_STOPPED_BY_WATCHPOINT) | |
3304 | threads_debug_printf ("Stopped by watchpoint."); | |
3305 | else if (gdb_breakpoint_here (event_child->stop_pc)) | |
3306 | threads_debug_printf ("Stopped by GDB breakpoint."); | |
3307 | } | |
3308 | ||
3309 | threads_debug_printf ("Hit a non-gdbserver trap event."); | |
6bf5e0ba PA |
3310 | |
3311 | /* Alright, we're going to report a stop. */ | |
3312 | ||
3b9a79ef | 3313 | /* Remove single-step breakpoints. */ |
7582c77c | 3314 | if (supports_software_single_step ()) |
8901d193 | 3315 | { |
3b9a79ef | 3316 | /* Remove single-step breakpoints or not. It it is true, stop all |
8901d193 YQ |
3317 | lwps, so that other threads won't hit the breakpoint in the |
3318 | staled memory. */ | |
3b9a79ef | 3319 | int remove_single_step_breakpoints_p = 0; |
8901d193 YQ |
3320 | |
3321 | if (non_stop) | |
3322 | { | |
3b9a79ef YQ |
3323 | remove_single_step_breakpoints_p |
3324 | = has_single_step_breakpoints (current_thread); | |
8901d193 YQ |
3325 | } |
3326 | else | |
3327 | { | |
3328 | /* In all-stop, a stop reply cancels all previous resume | |
3b9a79ef | 3329 | requests. Delete all single-step breakpoints. */ |
8901d193 | 3330 | |
9c80ecd6 SM |
3331 | find_thread ([&] (thread_info *thread) { |
3332 | if (has_single_step_breakpoints (thread)) | |
3333 | { | |
3334 | remove_single_step_breakpoints_p = 1; | |
3335 | return true; | |
3336 | } | |
8901d193 | 3337 | |
9c80ecd6 SM |
3338 | return false; |
3339 | }); | |
8901d193 YQ |
3340 | } |
3341 | ||
3b9a79ef | 3342 | if (remove_single_step_breakpoints_p) |
8901d193 | 3343 | { |
3b9a79ef | 3344 | /* If we remove single-step breakpoints from memory, stop all lwps, |
8901d193 YQ |
3345 | so that other threads won't hit the breakpoint in the staled |
3346 | memory. */ | |
3347 | stop_all_lwps (0, event_child); | |
3348 | ||
3349 | if (non_stop) | |
3350 | { | |
3b9a79ef YQ |
3351 | gdb_assert (has_single_step_breakpoints (current_thread)); |
3352 | delete_single_step_breakpoints (current_thread); | |
8901d193 YQ |
3353 | } |
3354 | else | |
3355 | { | |
9c80ecd6 SM |
3356 | for_each_thread ([] (thread_info *thread){ |
3357 | if (has_single_step_breakpoints (thread)) | |
3358 | delete_single_step_breakpoints (thread); | |
3359 | }); | |
8901d193 YQ |
3360 | } |
3361 | ||
3362 | unstop_all_lwps (0, event_child); | |
3363 | } | |
3364 | } | |
3365 | ||
582511be | 3366 | if (!stabilizing_threads) |
6bf5e0ba PA |
3367 | { |
3368 | /* In all-stop, stop all threads. */ | |
582511be PA |
3369 | if (!non_stop) |
3370 | stop_all_lwps (0, NULL); | |
6bf5e0ba | 3371 | |
c03e6ccc | 3372 | if (step_over_finished) |
582511be PA |
3373 | { |
3374 | if (!non_stop) | |
3375 | { | |
3376 | /* If we were doing a step-over, all other threads but | |
3377 | the stepping one had been paused in start_step_over, | |
3378 | with their suspend counts incremented. We don't want | |
3379 | to do a full unstop/unpause, because we're in | |
3380 | all-stop mode (so we want threads stopped), but we | |
3381 | still need to unsuspend the other threads, to | |
3382 | decrement their `suspended' count back. */ | |
3383 | unsuspend_all_lwps (event_child); | |
3384 | } | |
3385 | else | |
3386 | { | |
3387 | /* If we just finished a step-over, then all threads had | |
3388 | been momentarily paused. In all-stop, that's fine, | |
3389 | we want threads stopped by now anyway. In non-stop, | |
3390 | we need to re-resume threads that GDB wanted to be | |
3391 | running. */ | |
3392 | unstop_all_lwps (1, event_child); | |
3393 | } | |
3394 | } | |
c03e6ccc | 3395 | |
3aa5cfa0 AT |
3396 | /* If we're not waiting for a specific LWP, choose an event LWP |
3397 | from among those that have had events. Giving equal priority | |
3398 | to all LWPs that have had events helps prevent | |
3399 | starvation. */ | |
d7e15655 | 3400 | if (ptid == minus_one_ptid) |
3aa5cfa0 AT |
3401 | { |
3402 | event_child->status_pending_p = 1; | |
3403 | event_child->status_pending = w; | |
3404 | ||
3405 | select_event_lwp (&event_child); | |
3406 | ||
3407 | /* current_thread and event_child must stay in sync. */ | |
24583e45 | 3408 | switch_to_thread (get_lwp_thread (event_child)); |
3aa5cfa0 AT |
3409 | |
3410 | event_child->status_pending_p = 0; | |
3411 | w = event_child->status_pending; | |
3412 | } | |
3413 | ||
3414 | ||
fa593d66 | 3415 | /* Stabilize threads (move out of jump pads). */ |
582511be | 3416 | if (!non_stop) |
5c9eb2f2 | 3417 | target_stabilize_threads (); |
6bf5e0ba PA |
3418 | } |
3419 | else | |
3420 | { | |
3421 | /* If we just finished a step-over, then all threads had been | |
3422 | momentarily paused. In all-stop, that's fine, we want | |
3423 | threads stopped by now anyway. In non-stop, we need to | |
3424 | re-resume threads that GDB wanted to be running. */ | |
3425 | if (step_over_finished) | |
7984d532 | 3426 | unstop_all_lwps (1, event_child); |
6bf5e0ba PA |
3427 | } |
3428 | ||
183be222 | 3429 | if (event_child->waitstatus.kind () != TARGET_WAITKIND_IGNORE) |
de0d863e | 3430 | { |
00db26fa PA |
3431 | /* If the reported event is an exit, fork, vfork or exec, let |
3432 | GDB know. */ | |
5a04c4cf PA |
3433 | |
3434 | /* Break the unreported fork relationship chain. */ | |
183be222 SM |
3435 | if (event_child->waitstatus.kind () == TARGET_WAITKIND_FORKED |
3436 | || event_child->waitstatus.kind () == TARGET_WAITKIND_VFORKED) | |
5a04c4cf PA |
3437 | { |
3438 | event_child->fork_relative->fork_relative = NULL; | |
3439 | event_child->fork_relative = NULL; | |
3440 | } | |
3441 | ||
00db26fa | 3442 | *ourstatus = event_child->waitstatus; |
de0d863e | 3443 | /* Clear the event lwp's waitstatus since we handled it already. */ |
183be222 | 3444 | event_child->waitstatus.set_ignore (); |
de0d863e DB |
3445 | } |
3446 | else | |
183be222 SM |
3447 | { |
3448 | /* The actual stop signal is overwritten below. */ | |
3449 | ourstatus->set_stopped (GDB_SIGNAL_0); | |
3450 | } | |
5b1c542e | 3451 | |
582511be | 3452 | /* Now that we've selected our final event LWP, un-adjust its PC if |
3e572f71 PA |
3453 | it was a software breakpoint, and the client doesn't know we can |
3454 | adjust the breakpoint ourselves. */ | |
3455 | if (event_child->stop_reason == TARGET_STOPPED_BY_SW_BREAKPOINT | |
c12a5089 | 3456 | && !cs.swbreak_feature) |
582511be | 3457 | { |
d4807ea2 | 3458 | int decr_pc = low_decr_pc_after_break (); |
582511be PA |
3459 | |
3460 | if (decr_pc != 0) | |
3461 | { | |
3462 | struct regcache *regcache | |
3463 | = get_thread_regcache (current_thread, 1); | |
bf9ae9d8 | 3464 | low_set_pc (regcache, event_child->stop_pc + decr_pc); |
582511be PA |
3465 | } |
3466 | } | |
3467 | ||
82075af2 JS |
3468 | if (WSTOPSIG (w) == SYSCALL_SIGTRAP) |
3469 | { | |
183be222 SM |
3470 | int syscall_number; |
3471 | ||
3472 | get_syscall_trapinfo (event_child, &syscall_number); | |
3473 | if (event_child->syscall_state == TARGET_WAITKIND_SYSCALL_ENTRY) | |
3474 | ourstatus->set_syscall_entry (syscall_number); | |
3475 | else if (event_child->syscall_state == TARGET_WAITKIND_SYSCALL_RETURN) | |
3476 | ourstatus->set_syscall_return (syscall_number); | |
3477 | else | |
3478 | gdb_assert_not_reached ("unexpected syscall state"); | |
82075af2 JS |
3479 | } |
3480 | else if (current_thread->last_resume_kind == resume_stop | |
3481 | && WSTOPSIG (w) == SIGSTOP) | |
bd99dc85 PA |
3482 | { |
3483 | /* A thread that has been requested to stop by GDB with vCont;t, | |
3484 | and it stopped cleanly, so report as SIG0. The use of | |
3485 | SIGSTOP is an implementation detail. */ | |
183be222 | 3486 | ourstatus->set_stopped (GDB_SIGNAL_0); |
bd99dc85 | 3487 | } |
0bfdf32f | 3488 | else if (current_thread->last_resume_kind == resume_stop |
8336d594 | 3489 | && WSTOPSIG (w) != SIGSTOP) |
bd99dc85 PA |
3490 | { |
3491 | /* A thread that has been requested to stop by GDB with vCont;t, | |
d50171e4 | 3492 | but, it stopped for other reasons. */ |
183be222 | 3493 | ourstatus->set_stopped (gdb_signal_from_host (WSTOPSIG (w))); |
bd99dc85 | 3494 | } |
183be222 SM |
3495 | else if (ourstatus->kind () == TARGET_WAITKIND_STOPPED) |
3496 | ourstatus->set_stopped (gdb_signal_from_host (WSTOPSIG (w))); | |
bd99dc85 | 3497 | |
d7e15655 | 3498 | gdb_assert (step_over_bkpt == null_ptid); |
d50171e4 | 3499 | |
e48359ea | 3500 | threads_debug_printf ("ret = %s, %s", |
c058728c | 3501 | target_pid_to_str (ptid_of (current_thread)).c_str (), |
e48359ea | 3502 | ourstatus->to_string ().c_str ()); |
bd99dc85 | 3503 | |
183be222 | 3504 | if (ourstatus->kind () == TARGET_WAITKIND_EXITED) |
65706a29 PA |
3505 | return filter_exit_event (event_child, ourstatus); |
3506 | ||
0bfdf32f | 3507 | return ptid_of (current_thread); |
bd99dc85 PA |
3508 | } |
3509 | ||
3510 | /* Get rid of any pending event in the pipe. */ | |
3511 | static void | |
3512 | async_file_flush (void) | |
3513 | { | |
cdc8e9b2 | 3514 | linux_event_pipe.flush (); |
bd99dc85 PA |
3515 | } |
3516 | ||
3517 | /* Put something in the pipe, so the event loop wakes up. */ | |
3518 | static void | |
3519 | async_file_mark (void) | |
3520 | { | |
cdc8e9b2 | 3521 | linux_event_pipe.mark (); |
bd99dc85 PA |
3522 | } |
3523 | ||
6532e7e3 TBA |
3524 | ptid_t |
3525 | linux_process_target::wait (ptid_t ptid, | |
3526 | target_waitstatus *ourstatus, | |
b60cea74 | 3527 | target_wait_flags target_options) |
bd99dc85 | 3528 | { |
95954743 | 3529 | ptid_t event_ptid; |
bd99dc85 | 3530 | |
bd99dc85 PA |
3531 | /* Flush the async file first. */ |
3532 | if (target_is_async_p ()) | |
3533 | async_file_flush (); | |
3534 | ||
582511be PA |
3535 | do |
3536 | { | |
d16f3f6c | 3537 | event_ptid = wait_1 (ptid, ourstatus, target_options); |
582511be PA |
3538 | } |
3539 | while ((target_options & TARGET_WNOHANG) == 0 | |
d7e15655 | 3540 | && event_ptid == null_ptid |
183be222 | 3541 | && ourstatus->kind () == TARGET_WAITKIND_IGNORE); |
bd99dc85 PA |
3542 | |
3543 | /* If at least one stop was reported, there may be more. A single | |
3544 | SIGCHLD can signal more than one child stop. */ | |
3545 | if (target_is_async_p () | |
3546 | && (target_options & TARGET_WNOHANG) != 0 | |
d7e15655 | 3547 | && event_ptid != null_ptid) |
bd99dc85 PA |
3548 | async_file_mark (); |
3549 | ||
3550 | return event_ptid; | |
da6d8c04 DJ |
3551 | } |
3552 | ||
c5f62d5f | 3553 | /* Send a signal to an LWP. */ |
fd500816 DJ |
3554 | |
3555 | static int | |
a1928bad | 3556 | kill_lwp (unsigned long lwpid, int signo) |
fd500816 | 3557 | { |
4a6ed09b | 3558 | int ret; |
fd500816 | 3559 | |
4a6ed09b PA |
3560 | errno = 0; |
3561 | ret = syscall (__NR_tkill, lwpid, signo); | |
3562 | if (errno == ENOSYS) | |
3563 | { | |
3564 | /* If tkill fails, then we are not using nptl threads, a | |
3565 | configuration we no longer support. */ | |
3566 | perror_with_name (("tkill")); | |
3567 | } | |
3568 | return ret; | |
fd500816 DJ |
3569 | } |
3570 | ||
964e4306 PA |
3571 | void |
3572 | linux_stop_lwp (struct lwp_info *lwp) | |
3573 | { | |
3574 | send_sigstop (lwp); | |
3575 | } | |
3576 | ||
0d62e5e8 | 3577 | static void |
02fc4de7 | 3578 | send_sigstop (struct lwp_info *lwp) |
0d62e5e8 | 3579 | { |
bd99dc85 | 3580 | int pid; |
0d62e5e8 | 3581 | |
d86d4aaf | 3582 | pid = lwpid_of (get_lwp_thread (lwp)); |
bd99dc85 | 3583 | |
0d62e5e8 DJ |
3584 | /* If we already have a pending stop signal for this process, don't |
3585 | send another. */ | |
54a0b537 | 3586 | if (lwp->stop_expected) |
0d62e5e8 | 3587 | { |
c058728c | 3588 | threads_debug_printf ("Have pending sigstop for lwp %d", pid); |
ae13219e | 3589 | |
0d62e5e8 DJ |
3590 | return; |
3591 | } | |
3592 | ||
c058728c | 3593 | threads_debug_printf ("Sending sigstop to lwp %d", pid); |
0d62e5e8 | 3594 | |
d50171e4 | 3595 | lwp->stop_expected = 1; |
bd99dc85 | 3596 | kill_lwp (pid, SIGSTOP); |
0d62e5e8 DJ |
3597 | } |
3598 | ||
df3e4dbe SM |
3599 | static void |
3600 | send_sigstop (thread_info *thread, lwp_info *except) | |
02fc4de7 | 3601 | { |
d86d4aaf | 3602 | struct lwp_info *lwp = get_thread_lwp (thread); |
02fc4de7 | 3603 | |
7984d532 PA |
3604 | /* Ignore EXCEPT. */ |
3605 | if (lwp == except) | |
df3e4dbe | 3606 | return; |
7984d532 | 3607 | |
02fc4de7 | 3608 | if (lwp->stopped) |
df3e4dbe | 3609 | return; |
02fc4de7 PA |
3610 | |
3611 | send_sigstop (lwp); | |
7984d532 PA |
3612 | } |
3613 | ||
3614 | /* Increment the suspend count of an LWP, and stop it, if not stopped | |
3615 | yet. */ | |
df3e4dbe SM |
3616 | static void |
3617 | suspend_and_send_sigstop (thread_info *thread, lwp_info *except) | |
7984d532 | 3618 | { |
d86d4aaf | 3619 | struct lwp_info *lwp = get_thread_lwp (thread); |
7984d532 PA |
3620 | |
3621 | /* Ignore EXCEPT. */ | |
3622 | if (lwp == except) | |
df3e4dbe | 3623 | return; |
7984d532 | 3624 | |
863d01bd | 3625 | lwp_suspended_inc (lwp); |
7984d532 | 3626 | |
df3e4dbe | 3627 | send_sigstop (thread, except); |
02fc4de7 PA |
3628 | } |
3629 | ||
95954743 PA |
3630 | static void |
3631 | mark_lwp_dead (struct lwp_info *lwp, int wstat) | |
3632 | { | |
95954743 PA |
3633 | /* Store the exit status for later. */ |
3634 | lwp->status_pending_p = 1; | |
3635 | lwp->status_pending = wstat; | |
3636 | ||
00db26fa PA |
3637 | /* Store in waitstatus as well, as there's nothing else to process |
3638 | for this event. */ | |
3639 | if (WIFEXITED (wstat)) | |
183be222 | 3640 | lwp->waitstatus.set_exited (WEXITSTATUS (wstat)); |
00db26fa | 3641 | else if (WIFSIGNALED (wstat)) |
183be222 | 3642 | lwp->waitstatus.set_signalled (gdb_signal_from_host (WTERMSIG (wstat))); |
00db26fa | 3643 | |
95954743 PA |
3644 | /* Prevent trying to stop it. */ |
3645 | lwp->stopped = 1; | |
3646 | ||
3647 | /* No further stops are expected from a dead lwp. */ | |
3648 | lwp->stop_expected = 0; | |
3649 | } | |
3650 | ||
00db26fa PA |
3651 | /* Return true if LWP has exited already, and has a pending exit event |
3652 | to report to GDB. */ | |
3653 | ||
3654 | static int | |
3655 | lwp_is_marked_dead (struct lwp_info *lwp) | |
3656 | { | |
3657 | return (lwp->status_pending_p | |
3658 | && (WIFEXITED (lwp->status_pending) | |
3659 | || WIFSIGNALED (lwp->status_pending))); | |
3660 | } | |
3661 | ||
d16f3f6c TBA |
3662 | void |
3663 | linux_process_target::wait_for_sigstop () | |
0d62e5e8 | 3664 | { |
0bfdf32f | 3665 | struct thread_info *saved_thread; |
95954743 | 3666 | ptid_t saved_tid; |
fa96cb38 PA |
3667 | int wstat; |
3668 | int ret; | |
0d62e5e8 | 3669 | |
0bfdf32f GB |
3670 | saved_thread = current_thread; |
3671 | if (saved_thread != NULL) | |
9c80ecd6 | 3672 | saved_tid = saved_thread->id; |
bd99dc85 | 3673 | else |
95954743 | 3674 | saved_tid = null_ptid; /* avoid bogus unused warning */ |
bd99dc85 | 3675 | |
20ac1cdb TBA |
3676 | scoped_restore_current_thread restore_thread; |
3677 | ||
c058728c | 3678 | threads_debug_printf ("pulling events"); |
d50171e4 | 3679 | |
fa96cb38 PA |
3680 | /* Passing NULL_PTID as filter indicates we want all events to be |
3681 | left pending. Eventually this returns when there are no | |
3682 | unwaited-for children left. */ | |
d16f3f6c | 3683 | ret = wait_for_event_filtered (minus_one_ptid, null_ptid, &wstat, __WALL); |
fa96cb38 | 3684 | gdb_assert (ret == -1); |
0d62e5e8 | 3685 | |
13d3d99b | 3686 | if (saved_thread == NULL || mythread_alive (saved_tid)) |
20ac1cdb | 3687 | return; |
0d62e5e8 DJ |
3688 | else |
3689 | { | |
c058728c | 3690 | threads_debug_printf ("Previously current thread died."); |
0d62e5e8 | 3691 | |
f0db101d PA |
3692 | /* We can't change the current inferior behind GDB's back, |
3693 | otherwise, a subsequent command may apply to the wrong | |
3694 | process. */ | |
20ac1cdb TBA |
3695 | restore_thread.dont_restore (); |
3696 | switch_to_thread (nullptr); | |
0d62e5e8 DJ |
3697 | } |
3698 | } | |
3699 | ||
13e567af TBA |
3700 | bool |
3701 | linux_process_target::stuck_in_jump_pad (thread_info *thread) | |
fa593d66 | 3702 | { |
d86d4aaf | 3703 | struct lwp_info *lwp = get_thread_lwp (thread); |
fa593d66 | 3704 | |
863d01bd PA |
3705 | if (lwp->suspended != 0) |
3706 | { | |
3707 | internal_error (__FILE__, __LINE__, | |
3708 | "LWP %ld is suspended, suspended=%d\n", | |
3709 | lwpid_of (thread), lwp->suspended); | |
3710 | } | |
fa593d66 PA |
3711 | gdb_assert (lwp->stopped); |
3712 | ||
3713 | /* Allow debugging the jump pad, gdb_collect, etc.. */ | |
3714 | return (supports_fast_tracepoints () | |
58b4daa5 | 3715 | && agent_loaded_p () |
fa593d66 | 3716 | && (gdb_breakpoint_here (lwp->stop_pc) |
15c66dd6 | 3717 | || lwp->stop_reason == TARGET_STOPPED_BY_WATCHPOINT |
fa593d66 | 3718 | || thread->last_resume_kind == resume_step) |
229d26fc SM |
3719 | && (linux_fast_tracepoint_collecting (lwp, NULL) |
3720 | != fast_tpoint_collect_result::not_collecting)); | |
fa593d66 PA |
3721 | } |
3722 | ||
d16f3f6c TBA |
3723 | void |
3724 | linux_process_target::move_out_of_jump_pad (thread_info *thread) | |
fa593d66 | 3725 | { |
d86d4aaf | 3726 | struct lwp_info *lwp = get_thread_lwp (thread); |
fa593d66 PA |
3727 | int *wstat; |
3728 | ||
863d01bd PA |
3729 | if (lwp->suspended != 0) |
3730 | { | |
3731 | internal_error (__FILE__, __LINE__, | |
3732 | "LWP %ld is suspended, suspended=%d\n", | |
3733 | lwpid_of (thread), lwp->suspended); | |
3734 | } | |
fa593d66 PA |
3735 | gdb_assert (lwp->stopped); |
3736 | ||
f0ce0d3a | 3737 | /* For gdb_breakpoint_here. */ |
24583e45 TBA |
3738 | scoped_restore_current_thread restore_thread; |
3739 | switch_to_thread (thread); | |
f0ce0d3a | 3740 | |
fa593d66 PA |
3741 | wstat = lwp->status_pending_p ? &lwp->status_pending : NULL; |
3742 | ||
3743 | /* Allow debugging the jump pad, gdb_collect, etc. */ | |
3744 | if (!gdb_breakpoint_here (lwp->stop_pc) | |
15c66dd6 | 3745 | && lwp->stop_reason != TARGET_STOPPED_BY_WATCHPOINT |
fa593d66 PA |
3746 | && thread->last_resume_kind != resume_step |
3747 | && maybe_move_out_of_jump_pad (lwp, wstat)) | |
3748 | { | |
c058728c SM |
3749 | threads_debug_printf ("LWP %ld needs stabilizing (in jump pad)", |
3750 | lwpid_of (thread)); | |
fa593d66 PA |
3751 | |
3752 | if (wstat) | |
3753 | { | |
3754 | lwp->status_pending_p = 0; | |
3755 | enqueue_one_deferred_signal (lwp, wstat); | |
3756 | ||
c058728c SM |
3757 | threads_debug_printf ("Signal %d for LWP %ld deferred (in jump pad", |
3758 | WSTOPSIG (*wstat), lwpid_of (thread)); | |
fa593d66 PA |
3759 | } |
3760 | ||
df95181f | 3761 | resume_one_lwp (lwp, 0, 0, NULL); |
fa593d66 PA |
3762 | } |
3763 | else | |
863d01bd | 3764 | lwp_suspended_inc (lwp); |
fa593d66 PA |
3765 | } |
3766 | ||
5a6b0a41 SM |
3767 | static bool |
3768 | lwp_running (thread_info *thread) | |
fa593d66 | 3769 | { |
d86d4aaf | 3770 | struct lwp_info *lwp = get_thread_lwp (thread); |
fa593d66 | 3771 | |
00db26fa | 3772 | if (lwp_is_marked_dead (lwp)) |
5a6b0a41 SM |
3773 | return false; |
3774 | ||
3775 | return !lwp->stopped; | |
fa593d66 PA |
3776 | } |
3777 | ||
d16f3f6c TBA |
3778 | void |
3779 | linux_process_target::stop_all_lwps (int suspend, lwp_info *except) | |
0d62e5e8 | 3780 | { |
bde24c0a PA |
3781 | /* Should not be called recursively. */ |
3782 | gdb_assert (stopping_threads == NOT_STOPPING_THREADS); | |
3783 | ||
c058728c SM |
3784 | THREADS_SCOPED_DEBUG_ENTER_EXIT; |
3785 | ||
3786 | threads_debug_printf | |
3787 | ("%s, except=%s", suspend ? "stop-and-suspend" : "stop", | |
3788 | (except != NULL | |
3789 | ? target_pid_to_str (ptid_of (get_lwp_thread (except))).c_str () | |
3790 | : "none")); | |
87ce2a04 | 3791 | |
bde24c0a PA |
3792 | stopping_threads = (suspend |
3793 | ? STOPPING_AND_SUSPENDING_THREADS | |
3794 | : STOPPING_THREADS); | |
7984d532 PA |
3795 | |
3796 | if (suspend) | |
df3e4dbe SM |
3797 | for_each_thread ([&] (thread_info *thread) |
3798 | { | |
3799 | suspend_and_send_sigstop (thread, except); | |
3800 | }); | |
7984d532 | 3801 | else |
df3e4dbe SM |
3802 | for_each_thread ([&] (thread_info *thread) |
3803 | { | |
3804 | send_sigstop (thread, except); | |
3805 | }); | |
3806 | ||
fa96cb38 | 3807 | wait_for_sigstop (); |
bde24c0a | 3808 | stopping_threads = NOT_STOPPING_THREADS; |
87ce2a04 | 3809 | |
c058728c | 3810 | threads_debug_printf ("setting stopping_threads back to !stopping"); |
0d62e5e8 DJ |
3811 | } |
3812 | ||
863d01bd PA |
3813 | /* Enqueue one signal in the chain of signals which need to be |
3814 | delivered to this process on next resume. */ | |
3815 | ||
3816 | static void | |
3817 | enqueue_pending_signal (struct lwp_info *lwp, int signal, siginfo_t *info) | |
3818 | { | |
013e3554 TBA |
3819 | lwp->pending_signals.emplace_back (signal); |
3820 | if (info == nullptr) | |
3821 | memset (&lwp->pending_signals.back ().info, 0, sizeof (siginfo_t)); | |
863d01bd | 3822 | else |
013e3554 | 3823 | lwp->pending_signals.back ().info = *info; |
863d01bd PA |
3824 | } |
3825 | ||
df95181f TBA |
3826 | void |
3827 | linux_process_target::install_software_single_step_breakpoints (lwp_info *lwp) | |
fa5308bd | 3828 | { |
984a2c04 YQ |
3829 | struct thread_info *thread = get_lwp_thread (lwp); |
3830 | struct regcache *regcache = get_thread_regcache (thread, 1); | |
8ce47547 | 3831 | |
24583e45 | 3832 | scoped_restore_current_thread restore_thread; |
984a2c04 | 3833 | |
24583e45 | 3834 | switch_to_thread (thread); |
7582c77c | 3835 | std::vector<CORE_ADDR> next_pcs = low_get_next_pcs (regcache); |
fa5308bd | 3836 | |
a0ff9e1a | 3837 | for (CORE_ADDR pc : next_pcs) |
3b9a79ef | 3838 | set_single_step_breakpoint (pc, current_ptid); |
fa5308bd AT |
3839 | } |
3840 | ||
df95181f TBA |
3841 | int |
3842 | linux_process_target::single_step (lwp_info* lwp) | |
7fe5e27e AT |
3843 | { |
3844 | int step = 0; | |
3845 | ||
b31cdfa6 | 3846 | if (supports_hardware_single_step ()) |
7fe5e27e AT |
3847 | { |
3848 | step = 1; | |
3849 | } | |
7582c77c | 3850 | else if (supports_software_single_step ()) |
7fe5e27e AT |
3851 | { |
3852 | install_software_single_step_breakpoints (lwp); | |
3853 | step = 0; | |
3854 | } | |
3855 | else | |
c058728c | 3856 | threads_debug_printf ("stepping is not implemented on this target"); |
7fe5e27e AT |
3857 | |
3858 | return step; | |
3859 | } | |
3860 | ||
35ac8b3e | 3861 | /* The signal can be delivered to the inferior if we are not trying to |
5b061e98 YQ |
3862 | finish a fast tracepoint collect. Since signal can be delivered in |
3863 | the step-over, the program may go to signal handler and trap again | |
3864 | after return from the signal handler. We can live with the spurious | |
3865 | double traps. */ | |
35ac8b3e YQ |
3866 | |
3867 | static int | |
3868 | lwp_signal_can_be_delivered (struct lwp_info *lwp) | |
3869 | { | |
229d26fc SM |
3870 | return (lwp->collecting_fast_tracepoint |
3871 | == fast_tpoint_collect_result::not_collecting); | |
35ac8b3e YQ |
3872 | } |
3873 | ||
df95181f TBA |
3874 | void |
3875 | linux_process_target::resume_one_lwp_throw (lwp_info *lwp, int step, | |
3876 | int signal, siginfo_t *info) | |
da6d8c04 | 3877 | { |
d86d4aaf | 3878 | struct thread_info *thread = get_lwp_thread (lwp); |
82075af2 | 3879 | int ptrace_request; |
c06cbd92 YQ |
3880 | struct process_info *proc = get_thread_process (thread); |
3881 | ||
3882 | /* Note that target description may not be initialised | |
3883 | (proc->tdesc == NULL) at this point because the program hasn't | |
3884 | stopped at the first instruction yet. It means GDBserver skips | |
3885 | the extra traps from the wrapper program (see option --wrapper). | |
3886 | Code in this function that requires register access should be | |
3887 | guarded by proc->tdesc == NULL or something else. */ | |
0d62e5e8 | 3888 | |
54a0b537 | 3889 | if (lwp->stopped == 0) |
0d62e5e8 DJ |
3890 | return; |
3891 | ||
183be222 | 3892 | gdb_assert (lwp->waitstatus.kind () == TARGET_WAITKIND_IGNORE); |
65706a29 | 3893 | |
229d26fc SM |
3894 | fast_tpoint_collect_result fast_tp_collecting |
3895 | = lwp->collecting_fast_tracepoint; | |
fa593d66 | 3896 | |
229d26fc SM |
3897 | gdb_assert (!stabilizing_threads |
3898 | || (fast_tp_collecting | |
3899 | != fast_tpoint_collect_result::not_collecting)); | |
fa593d66 | 3900 | |
219f2f23 PA |
3901 | /* Cancel actions that rely on GDB not changing the PC (e.g., the |
3902 | user used the "jump" command, or "set $pc = foo"). */ | |
c06cbd92 | 3903 | if (thread->while_stepping != NULL && lwp->stop_pc != get_pc (lwp)) |
219f2f23 PA |
3904 | { |
3905 | /* Collecting 'while-stepping' actions doesn't make sense | |
3906 | anymore. */ | |
d86d4aaf | 3907 | release_while_stepping_state_list (thread); |
219f2f23 PA |
3908 | } |
3909 | ||
0d62e5e8 | 3910 | /* If we have pending signals or status, and a new signal, enqueue the |
35ac8b3e YQ |
3911 | signal. Also enqueue the signal if it can't be delivered to the |
3912 | inferior right now. */ | |
0d62e5e8 | 3913 | if (signal != 0 |
fa593d66 | 3914 | && (lwp->status_pending_p |
013e3554 | 3915 | || !lwp->pending_signals.empty () |
35ac8b3e | 3916 | || !lwp_signal_can_be_delivered (lwp))) |
94610ec4 YQ |
3917 | { |
3918 | enqueue_pending_signal (lwp, signal, info); | |
3919 | ||
3920 | /* Postpone any pending signal. It was enqueued above. */ | |
3921 | signal = 0; | |
3922 | } | |
0d62e5e8 | 3923 | |
d50171e4 PA |
3924 | if (lwp->status_pending_p) |
3925 | { | |
c058728c SM |
3926 | threads_debug_printf |
3927 | ("Not resuming lwp %ld (%s, stop %s); has pending status", | |
3928 | lwpid_of (thread), step ? "step" : "continue", | |
3929 | lwp->stop_expected ? "expected" : "not expected"); | |
d50171e4 PA |
3930 | return; |
3931 | } | |
0d62e5e8 | 3932 | |
24583e45 TBA |
3933 | scoped_restore_current_thread restore_thread; |
3934 | switch_to_thread (thread); | |
0d62e5e8 | 3935 | |
0d62e5e8 DJ |
3936 | /* This bit needs some thinking about. If we get a signal that |
3937 | we must report while a single-step reinsert is still pending, | |
3938 | we often end up resuming the thread. It might be better to | |
3939 | (ew) allow a stack of pending events; then we could be sure that | |
3940 | the reinsert happened right away and not lose any signals. | |
3941 | ||
3942 | Making this stack would also shrink the window in which breakpoints are | |
54a0b537 | 3943 | uninserted (see comment in linux_wait_for_lwp) but not enough for |
0d62e5e8 DJ |
3944 | complete correctness, so it won't solve that problem. It may be |
3945 | worthwhile just to solve this one, however. */ | |
54a0b537 | 3946 | if (lwp->bp_reinsert != 0) |
0d62e5e8 | 3947 | { |
c058728c SM |
3948 | threads_debug_printf (" pending reinsert at 0x%s", |
3949 | paddress (lwp->bp_reinsert)); | |
d50171e4 | 3950 | |
b31cdfa6 | 3951 | if (supports_hardware_single_step ()) |
d50171e4 | 3952 | { |
229d26fc | 3953 | if (fast_tp_collecting == fast_tpoint_collect_result::not_collecting) |
fa593d66 PA |
3954 | { |
3955 | if (step == 0) | |
9986ba08 | 3956 | warning ("BAD - reinserting but not stepping."); |
fa593d66 | 3957 | if (lwp->suspended) |
9986ba08 PA |
3958 | warning ("BAD - reinserting and suspended(%d).", |
3959 | lwp->suspended); | |
fa593d66 | 3960 | } |
d50171e4 | 3961 | } |
f79b145d YQ |
3962 | |
3963 | step = maybe_hw_step (thread); | |
0d62e5e8 DJ |
3964 | } |
3965 | ||
229d26fc | 3966 | if (fast_tp_collecting == fast_tpoint_collect_result::before_insn) |
c058728c SM |
3967 | threads_debug_printf |
3968 | ("lwp %ld wants to get out of fast tracepoint jump pad " | |
3969 | "(exit-jump-pad-bkpt)", lwpid_of (thread)); | |
3970 | ||
229d26fc | 3971 | else if (fast_tp_collecting == fast_tpoint_collect_result::at_insn) |
fa593d66 | 3972 | { |
c058728c SM |
3973 | threads_debug_printf |
3974 | ("lwp %ld wants to get out of fast tracepoint jump pad single-stepping", | |
3975 | lwpid_of (thread)); | |
fa593d66 | 3976 | |
b31cdfa6 | 3977 | if (supports_hardware_single_step ()) |
fa593d66 PA |
3978 | step = 1; |
3979 | else | |
38e08fca GB |
3980 | { |
3981 | internal_error (__FILE__, __LINE__, | |
3982 | "moving out of jump pad single-stepping" | |
3983 | " not implemented on this target"); | |
3984 | } | |
fa593d66 PA |
3985 | } |
3986 | ||
219f2f23 PA |
3987 | /* If we have while-stepping actions in this thread set it stepping. |
3988 | If we have a signal to deliver, it may or may not be set to | |
3989 | SIG_IGN, we don't know. Assume so, and allow collecting | |
3990 | while-stepping into a signal handler. A possible smart thing to | |
3991 | do would be to set an internal breakpoint at the signal return | |
3992 | address, continue, and carry on catching this while-stepping | |
3993 | action only when that breakpoint is hit. A future | |
3994 | enhancement. */ | |
7fe5e27e | 3995 | if (thread->while_stepping != NULL) |
219f2f23 | 3996 | { |
c058728c SM |
3997 | threads_debug_printf |
3998 | ("lwp %ld has a while-stepping action -> forcing step.", | |
3999 | lwpid_of (thread)); | |
7fe5e27e AT |
4000 | |
4001 | step = single_step (lwp); | |
219f2f23 PA |
4002 | } |
4003 | ||
bf9ae9d8 | 4004 | if (proc->tdesc != NULL && low_supports_breakpoints ()) |
0d62e5e8 | 4005 | { |
0bfdf32f | 4006 | struct regcache *regcache = get_thread_regcache (current_thread, 1); |
582511be | 4007 | |
bf9ae9d8 | 4008 | lwp->stop_pc = low_get_pc (regcache); |
582511be | 4009 | |
c058728c SM |
4010 | threads_debug_printf (" %s from pc 0x%lx", step ? "step" : "continue", |
4011 | (long) lwp->stop_pc); | |
0d62e5e8 DJ |
4012 | } |
4013 | ||
35ac8b3e YQ |
4014 | /* If we have pending signals, consume one if it can be delivered to |
4015 | the inferior. */ | |
013e3554 | 4016 | if (!lwp->pending_signals.empty () && lwp_signal_can_be_delivered (lwp)) |
0d62e5e8 | 4017 | { |
013e3554 | 4018 | const pending_signal &p_sig = lwp->pending_signals.front (); |
0d62e5e8 | 4019 | |
013e3554 TBA |
4020 | signal = p_sig.signal; |
4021 | if (p_sig.info.si_signo != 0) | |
d86d4aaf | 4022 | ptrace (PTRACE_SETSIGINFO, lwpid_of (thread), (PTRACE_TYPE_ARG3) 0, |
013e3554 | 4023 | &p_sig.info); |
32ca6d61 | 4024 | |
013e3554 | 4025 | lwp->pending_signals.pop_front (); |
0d62e5e8 DJ |
4026 | } |
4027 | ||
c058728c SM |
4028 | threads_debug_printf ("Resuming lwp %ld (%s, signal %d, stop %s)", |
4029 | lwpid_of (thread), step ? "step" : "continue", signal, | |
4030 | lwp->stop_expected ? "expected" : "not expected"); | |
94610ec4 | 4031 | |
d7599cc0 | 4032 | low_prepare_to_resume (lwp); |
aa5ca48f | 4033 | |
d86d4aaf | 4034 | regcache_invalidate_thread (thread); |
da6d8c04 | 4035 | errno = 0; |
54a0b537 | 4036 | lwp->stepping = step; |
82075af2 JS |
4037 | if (step) |
4038 | ptrace_request = PTRACE_SINGLESTEP; | |
4039 | else if (gdb_catching_syscalls_p (lwp)) | |
4040 | ptrace_request = PTRACE_SYSCALL; | |
4041 | else | |
4042 | ptrace_request = PTRACE_CONT; | |
4043 | ptrace (ptrace_request, | |
4044 | lwpid_of (thread), | |
b8e1b30e | 4045 | (PTRACE_TYPE_ARG3) 0, |
14ce3065 DE |
4046 | /* Coerce to a uintptr_t first to avoid potential gcc warning |
4047 | of coercing an 8 byte integer to a 4 byte pointer. */ | |
b8e1b30e | 4048 | (PTRACE_TYPE_ARG4) (uintptr_t) signal); |
0d62e5e8 | 4049 | |
da6d8c04 | 4050 | if (errno) |
23f238d3 PA |
4051 | perror_with_name ("resuming thread"); |
4052 | ||
4053 | /* Successfully resumed. Clear state that no longer makes sense, | |
4054 | and mark the LWP as running. Must not do this before resuming | |
4055 | otherwise if that fails other code will be confused. E.g., we'd | |
4056 | later try to stop the LWP and hang forever waiting for a stop | |
4057 | status. Note that we must not throw after this is cleared, | |
4058 | otherwise handle_zombie_lwp_error would get confused. */ | |
4059 | lwp->stopped = 0; | |
4060 | lwp->stop_reason = TARGET_STOPPED_BY_NO_REASON; | |
4061 | } | |
4062 | ||
d7599cc0 TBA |
4063 | void |
4064 | linux_process_target::low_prepare_to_resume (lwp_info *lwp) | |
4065 | { | |
4066 | /* Nop. */ | |
4067 | } | |
4068 | ||
23f238d3 PA |
4069 | /* Called when we try to resume a stopped LWP and that errors out. If |
4070 | the LWP is no longer in ptrace-stopped state (meaning it's zombie, | |
4071 | or about to become), discard the error, clear any pending status | |
4072 | the LWP may have, and return true (we'll collect the exit status | |
4073 | soon enough). Otherwise, return false. */ | |
4074 | ||
4075 | static int | |
4076 | check_ptrace_stopped_lwp_gone (struct lwp_info *lp) | |
4077 | { | |
4078 | struct thread_info *thread = get_lwp_thread (lp); | |
4079 | ||
4080 | /* If we get an error after resuming the LWP successfully, we'd | |
4081 | confuse !T state for the LWP being gone. */ | |
4082 | gdb_assert (lp->stopped); | |
4083 | ||
4084 | /* We can't just check whether the LWP is in 'Z (Zombie)' state, | |
4085 | because even if ptrace failed with ESRCH, the tracee may be "not | |
4086 | yet fully dead", but already refusing ptrace requests. In that | |
4087 | case the tracee has 'R (Running)' state for a little bit | |
4088 | (observed in Linux 3.18). See also the note on ESRCH in the | |
4089 | ptrace(2) man page. Instead, check whether the LWP has any state | |
4090 | other than ptrace-stopped. */ | |
4091 | ||
4092 | /* Don't assume anything if /proc/PID/status can't be read. */ | |
4093 | if (linux_proc_pid_is_trace_stopped_nowarn (lwpid_of (thread)) == 0) | |
3221518c | 4094 | { |
23f238d3 PA |
4095 | lp->stop_reason = TARGET_STOPPED_BY_NO_REASON; |
4096 | lp->status_pending_p = 0; | |
4097 | return 1; | |
4098 | } | |
4099 | return 0; | |
4100 | } | |
4101 | ||
df95181f TBA |
4102 | void |
4103 | linux_process_target::resume_one_lwp (lwp_info *lwp, int step, int signal, | |
4104 | siginfo_t *info) | |
23f238d3 | 4105 | { |
a70b8144 | 4106 | try |
23f238d3 | 4107 | { |
df95181f | 4108 | resume_one_lwp_throw (lwp, step, signal, info); |
23f238d3 | 4109 | } |
230d2906 | 4110 | catch (const gdb_exception_error &ex) |
23f238d3 PA |
4111 | { |
4112 | if (!check_ptrace_stopped_lwp_gone (lwp)) | |
eedc3f4f | 4113 | throw; |
3221518c | 4114 | } |
da6d8c04 DJ |
4115 | } |
4116 | ||
5fdda392 SM |
4117 | /* This function is called once per thread via for_each_thread. |
4118 | We look up which resume request applies to THREAD and mark it with a | |
4119 | pointer to the appropriate resume request. | |
5544ad89 DJ |
4120 | |
4121 | This algorithm is O(threads * resume elements), but resume elements | |
4122 | is small (and will remain small at least until GDB supports thread | |
4123 | suspension). */ | |
ebcf782c | 4124 | |
5fdda392 SM |
4125 | static void |
4126 | linux_set_resume_request (thread_info *thread, thread_resume *resume, size_t n) | |
0d62e5e8 | 4127 | { |
d86d4aaf | 4128 | struct lwp_info *lwp = get_thread_lwp (thread); |
64386c31 | 4129 | |
5fdda392 | 4130 | for (int ndx = 0; ndx < n; ndx++) |
95954743 | 4131 | { |
5fdda392 | 4132 | ptid_t ptid = resume[ndx].thread; |
d7e15655 | 4133 | if (ptid == minus_one_ptid |
9c80ecd6 | 4134 | || ptid == thread->id |
0c9070b3 YQ |
4135 | /* Handle both 'pPID' and 'pPID.-1' as meaning 'all threads |
4136 | of PID'. */ | |
e99b03dc | 4137 | || (ptid.pid () == pid_of (thread) |
0e998d96 | 4138 | && (ptid.is_pid () |
e38504b3 | 4139 | || ptid.lwp () == -1))) |
95954743 | 4140 | { |
5fdda392 | 4141 | if (resume[ndx].kind == resume_stop |
8336d594 | 4142 | && thread->last_resume_kind == resume_stop) |
d50171e4 | 4143 | { |
c058728c SM |
4144 | threads_debug_printf |
4145 | ("already %s LWP %ld at GDB's request", | |
4146 | (thread->last_status.kind () == TARGET_WAITKIND_STOPPED | |
4147 | ? "stopped" : "stopping"), | |
4148 | lwpid_of (thread)); | |
d50171e4 PA |
4149 | |
4150 | continue; | |
4151 | } | |
4152 | ||
5a04c4cf PA |
4153 | /* Ignore (wildcard) resume requests for already-resumed |
4154 | threads. */ | |
5fdda392 | 4155 | if (resume[ndx].kind != resume_stop |
5a04c4cf PA |
4156 | && thread->last_resume_kind != resume_stop) |
4157 | { | |
c058728c SM |
4158 | threads_debug_printf |
4159 | ("already %s LWP %ld at GDB's request", | |
4160 | (thread->last_resume_kind == resume_step | |
4161 | ? "stepping" : "continuing"), | |
4162 | lwpid_of (thread)); | |
5a04c4cf PA |
4163 | continue; |
4164 | } | |
4165 | ||
4166 | /* Don't let wildcard resumes resume fork children that GDB | |
4167 | does not yet know are new fork children. */ | |
4168 | if (lwp->fork_relative != NULL) | |
4169 | { | |
5a04c4cf PA |
4170 | struct lwp_info *rel = lwp->fork_relative; |
4171 | ||
4172 | if (rel->status_pending_p | |
183be222 SM |
4173 | && (rel->waitstatus.kind () == TARGET_WAITKIND_FORKED |
4174 | || rel->waitstatus.kind () == TARGET_WAITKIND_VFORKED)) | |
5a04c4cf | 4175 | { |
c058728c SM |
4176 | threads_debug_printf |
4177 | ("not resuming LWP %ld: has queued stop reply", | |
4178 | lwpid_of (thread)); | |
5a04c4cf PA |
4179 | continue; |
4180 | } | |
4181 | } | |
4182 | ||
4183 | /* If the thread has a pending event that has already been | |
4184 | reported to GDBserver core, but GDB has not pulled the | |
4185 | event out of the vStopped queue yet, likewise, ignore the | |
4186 | (wildcard) resume request. */ | |
9c80ecd6 | 4187 | if (in_queued_stop_replies (thread->id)) |
5a04c4cf | 4188 | { |
c058728c SM |
4189 | threads_debug_printf |
4190 | ("not resuming LWP %ld: has queued stop reply", | |
4191 | lwpid_of (thread)); | |
5a04c4cf PA |
4192 | continue; |
4193 | } | |
4194 | ||
5fdda392 | 4195 | lwp->resume = &resume[ndx]; |
8336d594 | 4196 | thread->last_resume_kind = lwp->resume->kind; |
fa593d66 | 4197 | |
c2d6af84 PA |
4198 | lwp->step_range_start = lwp->resume->step_range_start; |
4199 | lwp->step_range_end = lwp->resume->step_range_end; | |
4200 | ||
fa593d66 PA |
4201 | /* If we had a deferred signal to report, dequeue one now. |
4202 | This can happen if LWP gets more than one signal while | |
4203 | trying to get out of a jump pad. */ | |
4204 | if (lwp->stopped | |
4205 | && !lwp->status_pending_p | |
4206 | && dequeue_one_deferred_signal (lwp, &lwp->status_pending)) | |
4207 | { | |
4208 | lwp->status_pending_p = 1; | |
4209 | ||
c058728c SM |
4210 | threads_debug_printf |
4211 | ("Dequeueing deferred signal %d for LWP %ld, " | |
4212 | "leaving status pending.", | |
4213 | WSTOPSIG (lwp->status_pending), | |
4214 | lwpid_of (thread)); | |
fa593d66 PA |
4215 | } |
4216 | ||
5fdda392 | 4217 | return; |
95954743 PA |
4218 | } |
4219 | } | |
2bd7c093 PA |
4220 | |
4221 | /* No resume action for this thread. */ | |
4222 | lwp->resume = NULL; | |
5544ad89 DJ |
4223 | } |
4224 | ||
df95181f TBA |
4225 | bool |
4226 | linux_process_target::resume_status_pending (thread_info *thread) | |
5544ad89 | 4227 | { |
d86d4aaf | 4228 | struct lwp_info *lwp = get_thread_lwp (thread); |
5544ad89 | 4229 | |
bd99dc85 PA |
4230 | /* LWPs which will not be resumed are not interesting, because |
4231 | we might not wait for them next time through linux_wait. */ | |
2bd7c093 | 4232 | if (lwp->resume == NULL) |
25c28b4d | 4233 | return false; |
64386c31 | 4234 | |
df95181f | 4235 | return thread_still_has_status_pending (thread); |
d50171e4 PA |
4236 | } |
4237 | ||
df95181f TBA |
4238 | bool |
4239 | linux_process_target::thread_needs_step_over (thread_info *thread) | |
d50171e4 | 4240 | { |
d86d4aaf | 4241 | struct lwp_info *lwp = get_thread_lwp (thread); |
d50171e4 | 4242 | CORE_ADDR pc; |
c06cbd92 YQ |
4243 | struct process_info *proc = get_thread_process (thread); |
4244 | ||
4245 | /* GDBserver is skipping the extra traps from the wrapper program, | |
4246 | don't have to do step over. */ | |
4247 | if (proc->tdesc == NULL) | |
eca55aec | 4248 | return false; |
d50171e4 PA |
4249 | |
4250 | /* LWPs which will not be resumed are not interesting, because we | |
4251 | might not wait for them next time through linux_wait. */ | |
4252 | ||
4253 | if (!lwp->stopped) | |
4254 | { | |
c058728c SM |
4255 | threads_debug_printf ("Need step over [LWP %ld]? Ignoring, not stopped", |
4256 | lwpid_of (thread)); | |
eca55aec | 4257 | return false; |
d50171e4 PA |
4258 | } |
4259 | ||
8336d594 | 4260 | if (thread->last_resume_kind == resume_stop) |
d50171e4 | 4261 | { |
c058728c SM |
4262 | threads_debug_printf |
4263 | ("Need step over [LWP %ld]? Ignoring, should remain stopped", | |
4264 | lwpid_of (thread)); | |
eca55aec | 4265 | return false; |
d50171e4 PA |
4266 | } |
4267 | ||
7984d532 PA |
4268 | gdb_assert (lwp->suspended >= 0); |
4269 | ||
4270 | if (lwp->suspended) | |
4271 | { | |
c058728c SM |
4272 | threads_debug_printf ("Need step over [LWP %ld]? Ignoring, suspended", |
4273 | lwpid_of (thread)); | |
eca55aec | 4274 | return false; |
7984d532 PA |
4275 | } |
4276 | ||
bd99dc85 | 4277 | if (lwp->status_pending_p) |
d50171e4 | 4278 | { |
c058728c SM |
4279 | threads_debug_printf |
4280 | ("Need step over [LWP %ld]? Ignoring, has pending status.", | |
4281 | lwpid_of (thread)); | |
eca55aec | 4282 | return false; |
d50171e4 PA |
4283 | } |
4284 | ||
4285 | /* Note: PC, not STOP_PC. Either GDB has adjusted the PC already, | |
4286 | or we have. */ | |
4287 | pc = get_pc (lwp); | |
4288 | ||
4289 | /* If the PC has changed since we stopped, then don't do anything, | |
4290 | and let the breakpoint/tracepoint be hit. This happens if, for | |
4291 | instance, GDB handled the decr_pc_after_break subtraction itself, | |
4292 | GDB is OOL stepping this thread, or the user has issued a "jump" | |
4293 | command, or poked thread's registers herself. */ | |
4294 | if (pc != lwp->stop_pc) | |
4295 | { | |
c058728c SM |
4296 | threads_debug_printf |
4297 | ("Need step over [LWP %ld]? Cancelling, PC was changed. " | |
4298 | "Old stop_pc was 0x%s, PC is now 0x%s", lwpid_of (thread), | |
4299 | paddress (lwp->stop_pc), paddress (pc)); | |
eca55aec | 4300 | return false; |
d50171e4 PA |
4301 | } |
4302 | ||
484b3c32 YQ |
4303 | /* On software single step target, resume the inferior with signal |
4304 | rather than stepping over. */ | |
7582c77c | 4305 | if (supports_software_single_step () |
013e3554 | 4306 | && !lwp->pending_signals.empty () |
484b3c32 YQ |
4307 | && lwp_signal_can_be_delivered (lwp)) |
4308 | { | |
c058728c SM |
4309 | threads_debug_printf |
4310 | ("Need step over [LWP %ld]? Ignoring, has pending signals.", | |
4311 | lwpid_of (thread)); | |
484b3c32 | 4312 | |
eca55aec | 4313 | return false; |
484b3c32 YQ |
4314 | } |
4315 | ||
24583e45 TBA |
4316 | scoped_restore_current_thread restore_thread; |
4317 | switch_to_thread (thread); | |
d50171e4 | 4318 | |
8b07ae33 | 4319 | /* We can only step over breakpoints we know about. */ |
fa593d66 | 4320 | if (breakpoint_here (pc) || fast_tracepoint_jump_here (pc)) |
d50171e4 | 4321 | { |
8b07ae33 | 4322 | /* Don't step over a breakpoint that GDB expects to hit |
9f3a5c85 LM |
4323 | though. If the condition is being evaluated on the target's side |
4324 | and it evaluate to false, step over this breakpoint as well. */ | |
4325 | if (gdb_breakpoint_here (pc) | |
d3ce09f5 SS |
4326 | && gdb_condition_true_at_breakpoint (pc) |
4327 | && gdb_no_commands_at_breakpoint (pc)) | |
8b07ae33 | 4328 | { |
c058728c SM |
4329 | threads_debug_printf ("Need step over [LWP %ld]? yes, but found" |
4330 | " GDB breakpoint at 0x%s; skipping step over", | |
4331 | lwpid_of (thread), paddress (pc)); | |
d50171e4 | 4332 | |
eca55aec | 4333 | return false; |
8b07ae33 PA |
4334 | } |
4335 | else | |
4336 | { | |
c058728c SM |
4337 | threads_debug_printf ("Need step over [LWP %ld]? yes, " |
4338 | "found breakpoint at 0x%s", | |
4339 | lwpid_of (thread), paddress (pc)); | |
d50171e4 | 4340 | |
8b07ae33 | 4341 | /* We've found an lwp that needs stepping over --- return 1 so |
8f86d7aa | 4342 | that find_thread stops looking. */ |
eca55aec | 4343 | return true; |
8b07ae33 | 4344 | } |
d50171e4 PA |
4345 | } |
4346 | ||
c058728c SM |
4347 | threads_debug_printf |
4348 | ("Need step over [LWP %ld]? No, no breakpoint found at 0x%s", | |
4349 | lwpid_of (thread), paddress (pc)); | |
c6ecbae5 | 4350 | |
eca55aec | 4351 | return false; |
5544ad89 DJ |
4352 | } |
4353 | ||
d16f3f6c TBA |
4354 | void |
4355 | linux_process_target::start_step_over (lwp_info *lwp) | |
d50171e4 | 4356 | { |
d86d4aaf | 4357 | struct thread_info *thread = get_lwp_thread (lwp); |
d50171e4 | 4358 | CORE_ADDR pc; |
d50171e4 | 4359 | |
c058728c SM |
4360 | threads_debug_printf ("Starting step-over on LWP %ld. Stopping all threads", |
4361 | lwpid_of (thread)); | |
d50171e4 | 4362 | |
7984d532 | 4363 | stop_all_lwps (1, lwp); |
863d01bd PA |
4364 | |
4365 | if (lwp->suspended != 0) | |
4366 | { | |
4367 | internal_error (__FILE__, __LINE__, | |
4368 | "LWP %ld suspended=%d\n", lwpid_of (thread), | |
4369 | lwp->suspended); | |
4370 | } | |
d50171e4 | 4371 | |
c058728c | 4372 | threads_debug_printf ("Done stopping all threads for step-over."); |
d50171e4 PA |
4373 | |
4374 | /* Note, we should always reach here with an already adjusted PC, | |
4375 | either by GDB (if we're resuming due to GDB's request), or by our | |
4376 | caller, if we just finished handling an internal breakpoint GDB | |
4377 | shouldn't care about. */ | |
4378 | pc = get_pc (lwp); | |
4379 | ||
24583e45 TBA |
4380 | bool step = false; |
4381 | { | |
4382 | scoped_restore_current_thread restore_thread; | |
4383 | switch_to_thread (thread); | |
d50171e4 | 4384 | |
24583e45 TBA |
4385 | lwp->bp_reinsert = pc; |
4386 | uninsert_breakpoints_at (pc); | |
4387 | uninsert_fast_tracepoint_jumps_at (pc); | |
d50171e4 | 4388 | |
24583e45 TBA |
4389 | step = single_step (lwp); |
4390 | } | |
d50171e4 | 4391 | |
df95181f | 4392 | resume_one_lwp (lwp, step, 0, NULL); |
d50171e4 PA |
4393 | |
4394 | /* Require next event from this LWP. */ | |
9c80ecd6 | 4395 | step_over_bkpt = thread->id; |
d50171e4 PA |
4396 | } |
4397 | ||
b31cdfa6 TBA |
4398 | bool |
4399 | linux_process_target::finish_step_over (lwp_info *lwp) | |
d50171e4 PA |
4400 | { |
4401 | if (lwp->bp_reinsert != 0) | |
4402 | { | |
24583e45 | 4403 | scoped_restore_current_thread restore_thread; |
f79b145d | 4404 | |
c058728c | 4405 | threads_debug_printf ("Finished step over."); |
d50171e4 | 4406 | |
24583e45 | 4407 | switch_to_thread (get_lwp_thread (lwp)); |
f79b145d | 4408 | |
d50171e4 PA |
4409 | /* Reinsert any breakpoint at LWP->BP_REINSERT. Note that there |
4410 | may be no breakpoint to reinsert there by now. */ | |
4411 | reinsert_breakpoints_at (lwp->bp_reinsert); | |
fa593d66 | 4412 | reinsert_fast_tracepoint_jumps_at (lwp->bp_reinsert); |
d50171e4 PA |
4413 | |
4414 | lwp->bp_reinsert = 0; | |
4415 | ||
3b9a79ef YQ |
4416 | /* Delete any single-step breakpoints. No longer needed. We |
4417 | don't have to worry about other threads hitting this trap, | |
4418 | and later not being able to explain it, because we were | |
4419 | stepping over a breakpoint, and we hold all threads but | |
4420 | LWP stopped while doing that. */ | |
b31cdfa6 | 4421 | if (!supports_hardware_single_step ()) |
f79b145d | 4422 | { |
3b9a79ef YQ |
4423 | gdb_assert (has_single_step_breakpoints (current_thread)); |
4424 | delete_single_step_breakpoints (current_thread); | |
f79b145d | 4425 | } |
d50171e4 PA |
4426 | |
4427 | step_over_bkpt = null_ptid; | |
b31cdfa6 | 4428 | return true; |
d50171e4 PA |
4429 | } |
4430 | else | |
b31cdfa6 | 4431 | return false; |
d50171e4 PA |
4432 | } |
4433 | ||
d16f3f6c TBA |
4434 | void |
4435 | linux_process_target::complete_ongoing_step_over () | |
863d01bd | 4436 | { |
d7e15655 | 4437 | if (step_over_bkpt != null_ptid) |
863d01bd PA |
4438 | { |
4439 | struct lwp_info *lwp; | |
4440 | int wstat; | |
4441 | int ret; | |
4442 | ||
c058728c | 4443 | threads_debug_printf ("detach: step over in progress, finish it first"); |
863d01bd PA |
4444 | |
4445 | /* Passing NULL_PTID as filter indicates we want all events to | |
4446 | be left pending. Eventually this returns when there are no | |
4447 | unwaited-for children left. */ | |
d16f3f6c TBA |
4448 | ret = wait_for_event_filtered (minus_one_ptid, null_ptid, &wstat, |
4449 | __WALL); | |
863d01bd PA |
4450 | gdb_assert (ret == -1); |
4451 | ||
4452 | lwp = find_lwp_pid (step_over_bkpt); | |
4453 | if (lwp != NULL) | |
7e9cf1fe PA |
4454 | { |
4455 | finish_step_over (lwp); | |
4456 | ||
4457 | /* If we got our step SIGTRAP, don't leave it pending, | |
4458 | otherwise we would report it to GDB as a spurious | |
4459 | SIGTRAP. */ | |
4460 | gdb_assert (lwp->status_pending_p); | |
4461 | if (WIFSTOPPED (lwp->status_pending) | |
4462 | && WSTOPSIG (lwp->status_pending) == SIGTRAP) | |
4463 | { | |
4464 | thread_info *thread = get_lwp_thread (lwp); | |
4465 | if (thread->last_resume_kind != resume_step) | |
4466 | { | |
c058728c | 4467 | threads_debug_printf ("detach: discard step-over SIGTRAP"); |
7e9cf1fe PA |
4468 | |
4469 | lwp->status_pending_p = 0; | |
4470 | lwp->status_pending = 0; | |
4471 | resume_one_lwp (lwp, lwp->stepping, 0, NULL); | |
4472 | } | |
4473 | else | |
c058728c SM |
4474 | threads_debug_printf |
4475 | ("detach: resume_step, not discarding step-over SIGTRAP"); | |
7e9cf1fe PA |
4476 | } |
4477 | } | |
863d01bd PA |
4478 | step_over_bkpt = null_ptid; |
4479 | unsuspend_all_lwps (lwp); | |
4480 | } | |
4481 | } | |
4482 | ||
df95181f TBA |
4483 | void |
4484 | linux_process_target::resume_one_thread (thread_info *thread, | |
4485 | bool leave_all_stopped) | |
5544ad89 | 4486 | { |
d86d4aaf | 4487 | struct lwp_info *lwp = get_thread_lwp (thread); |
d50171e4 | 4488 | int leave_pending; |
5544ad89 | 4489 | |
2bd7c093 | 4490 | if (lwp->resume == NULL) |
c80825ff | 4491 | return; |
5544ad89 | 4492 | |
bd99dc85 | 4493 | if (lwp->resume->kind == resume_stop) |
5544ad89 | 4494 | { |
c058728c SM |
4495 | threads_debug_printf ("resume_stop request for LWP %ld", |
4496 | lwpid_of (thread)); | |
bd99dc85 PA |
4497 | |
4498 | if (!lwp->stopped) | |
4499 | { | |
c058728c | 4500 | threads_debug_printf ("stopping LWP %ld", lwpid_of (thread)); |
bd99dc85 | 4501 | |
d50171e4 PA |
4502 | /* Stop the thread, and wait for the event asynchronously, |
4503 | through the event loop. */ | |
02fc4de7 | 4504 | send_sigstop (lwp); |
bd99dc85 PA |
4505 | } |
4506 | else | |
4507 | { | |
c058728c | 4508 | threads_debug_printf ("already stopped LWP %ld", lwpid_of (thread)); |
d50171e4 PA |
4509 | |
4510 | /* The LWP may have been stopped in an internal event that | |
4511 | was not meant to be notified back to GDB (e.g., gdbserver | |
4512 | breakpoint), so we should be reporting a stop event in | |
4513 | this case too. */ | |
4514 | ||
4515 | /* If the thread already has a pending SIGSTOP, this is a | |
4516 | no-op. Otherwise, something later will presumably resume | |
4517 | the thread and this will cause it to cancel any pending | |
4518 | operation, due to last_resume_kind == resume_stop. If | |
4519 | the thread already has a pending status to report, we | |
4520 | will still report it the next time we wait - see | |
4521 | status_pending_p_callback. */ | |
1a981360 PA |
4522 | |
4523 | /* If we already have a pending signal to report, then | |
4524 | there's no need to queue a SIGSTOP, as this means we're | |
4525 | midway through moving the LWP out of the jumppad, and we | |
4526 | will report the pending signal as soon as that is | |
4527 | finished. */ | |
013e3554 | 4528 | if (lwp->pending_signals_to_report.empty ()) |
1a981360 | 4529 | send_sigstop (lwp); |
bd99dc85 | 4530 | } |
32ca6d61 | 4531 | |
bd99dc85 PA |
4532 | /* For stop requests, we're done. */ |
4533 | lwp->resume = NULL; | |
183be222 | 4534 | thread->last_status.set_ignore (); |
c80825ff | 4535 | return; |
5544ad89 DJ |
4536 | } |
4537 | ||
bd99dc85 | 4538 | /* If this thread which is about to be resumed has a pending status, |
863d01bd PA |
4539 | then don't resume it - we can just report the pending status. |
4540 | Likewise if it is suspended, because e.g., another thread is | |
4541 | stepping past a breakpoint. Make sure to queue any signals that | |
4542 | would otherwise be sent. In all-stop mode, we do this decision | |
4543 | based on if *any* thread has a pending status. If there's a | |
4544 | thread that needs the step-over-breakpoint dance, then don't | |
4545 | resume any other thread but that particular one. */ | |
4546 | leave_pending = (lwp->suspended | |
4547 | || lwp->status_pending_p | |
4548 | || leave_all_stopped); | |
5544ad89 | 4549 | |
0e9a339e YQ |
4550 | /* If we have a new signal, enqueue the signal. */ |
4551 | if (lwp->resume->sig != 0) | |
4552 | { | |
4553 | siginfo_t info, *info_p; | |
4554 | ||
4555 | /* If this is the same signal we were previously stopped by, | |
4556 | make sure to queue its siginfo. */ | |
4557 | if (WIFSTOPPED (lwp->last_status) | |
4558 | && WSTOPSIG (lwp->last_status) == lwp->resume->sig | |
4559 | && ptrace (PTRACE_GETSIGINFO, lwpid_of (thread), | |
4560 | (PTRACE_TYPE_ARG3) 0, &info) == 0) | |
4561 | info_p = &info; | |
4562 | else | |
4563 | info_p = NULL; | |
4564 | ||
4565 | enqueue_pending_signal (lwp, lwp->resume->sig, info_p); | |
4566 | } | |
4567 | ||
d50171e4 | 4568 | if (!leave_pending) |
bd99dc85 | 4569 | { |
c058728c | 4570 | threads_debug_printf ("resuming LWP %ld", lwpid_of (thread)); |
5544ad89 | 4571 | |
9c80ecd6 | 4572 | proceed_one_lwp (thread, NULL); |
bd99dc85 PA |
4573 | } |
4574 | else | |
c058728c | 4575 | threads_debug_printf ("leaving LWP %ld stopped", lwpid_of (thread)); |
5544ad89 | 4576 | |
183be222 | 4577 | thread->last_status.set_ignore (); |
bd99dc85 | 4578 | lwp->resume = NULL; |
0d62e5e8 DJ |
4579 | } |
4580 | ||
0e4d7e35 TBA |
4581 | void |
4582 | linux_process_target::resume (thread_resume *resume_info, size_t n) | |
0d62e5e8 | 4583 | { |
d86d4aaf | 4584 | struct thread_info *need_step_over = NULL; |
c6ecbae5 | 4585 | |
c058728c | 4586 | THREADS_SCOPED_DEBUG_ENTER_EXIT; |
87ce2a04 | 4587 | |
5fdda392 SM |
4588 | for_each_thread ([&] (thread_info *thread) |
4589 | { | |
4590 | linux_set_resume_request (thread, resume_info, n); | |
4591 | }); | |
5544ad89 | 4592 | |
d50171e4 PA |
4593 | /* If there is a thread which would otherwise be resumed, which has |
4594 | a pending status, then don't resume any threads - we can just | |
4595 | report the pending status. Make sure to queue any signals that | |
4596 | would otherwise be sent. In non-stop mode, we'll apply this | |
4597 | logic to each thread individually. We consume all pending events | |
4598 | before considering to start a step-over (in all-stop). */ | |
25c28b4d | 4599 | bool any_pending = false; |
bd99dc85 | 4600 | if (!non_stop) |
df95181f TBA |
4601 | any_pending = find_thread ([this] (thread_info *thread) |
4602 | { | |
4603 | return resume_status_pending (thread); | |
4604 | }) != nullptr; | |
d50171e4 PA |
4605 | |
4606 | /* If there is a thread which would otherwise be resumed, which is | |
4607 | stopped at a breakpoint that needs stepping over, then don't | |
4608 | resume any threads - have it step over the breakpoint with all | |
4609 | other threads stopped, then resume all threads again. Make sure | |
4610 | to queue any signals that would otherwise be delivered or | |
4611 | queued. */ | |
bf9ae9d8 | 4612 | if (!any_pending && low_supports_breakpoints ()) |
df95181f TBA |
4613 | need_step_over = find_thread ([this] (thread_info *thread) |
4614 | { | |
4615 | return thread_needs_step_over (thread); | |
4616 | }); | |
d50171e4 | 4617 | |
c80825ff | 4618 | bool leave_all_stopped = (need_step_over != NULL || any_pending); |
d50171e4 | 4619 | |
c058728c SM |
4620 | if (need_step_over != NULL) |
4621 | threads_debug_printf ("Not resuming all, need step over"); | |
4622 | else if (any_pending) | |
4623 | threads_debug_printf ("Not resuming, all-stop and found " | |
4624 | "an LWP with pending status"); | |
4625 | else | |
4626 | threads_debug_printf ("Resuming, no pending status or step over needed"); | |
d50171e4 PA |
4627 | |
4628 | /* Even if we're leaving threads stopped, queue all signals we'd | |
4629 | otherwise deliver. */ | |
c80825ff SM |
4630 | for_each_thread ([&] (thread_info *thread) |
4631 | { | |
df95181f | 4632 | resume_one_thread (thread, leave_all_stopped); |
c80825ff | 4633 | }); |
d50171e4 PA |
4634 | |
4635 | if (need_step_over) | |
d86d4aaf | 4636 | start_step_over (get_thread_lwp (need_step_over)); |
87ce2a04 | 4637 | |
1bebeeca PA |
4638 | /* We may have events that were pending that can/should be sent to |
4639 | the client now. Trigger a linux_wait call. */ | |
4640 | if (target_is_async_p ()) | |
4641 | async_file_mark (); | |
d50171e4 PA |
4642 | } |
4643 | ||
df95181f TBA |
4644 | void |
4645 | linux_process_target::proceed_one_lwp (thread_info *thread, lwp_info *except) | |
d50171e4 | 4646 | { |
d86d4aaf | 4647 | struct lwp_info *lwp = get_thread_lwp (thread); |
d50171e4 PA |
4648 | int step; |
4649 | ||
7984d532 | 4650 | if (lwp == except) |
e2b44075 | 4651 | return; |
d50171e4 | 4652 | |
c058728c | 4653 | threads_debug_printf ("lwp %ld", lwpid_of (thread)); |
d50171e4 PA |
4654 | |
4655 | if (!lwp->stopped) | |
4656 | { | |
c058728c | 4657 | threads_debug_printf (" LWP %ld already running", lwpid_of (thread)); |
e2b44075 | 4658 | return; |
d50171e4 PA |
4659 | } |
4660 | ||
02fc4de7 | 4661 | if (thread->last_resume_kind == resume_stop |
183be222 | 4662 | && thread->last_status.kind () != TARGET_WAITKIND_IGNORE) |
d50171e4 | 4663 | { |
c058728c SM |
4664 | threads_debug_printf (" client wants LWP to remain %ld stopped", |
4665 | lwpid_of (thread)); | |
e2b44075 | 4666 | return; |
d50171e4 PA |
4667 | } |
4668 | ||
4669 | if (lwp->status_pending_p) | |
4670 | { | |
c058728c SM |
4671 | threads_debug_printf (" LWP %ld has pending status, leaving stopped", |
4672 | lwpid_of (thread)); | |
e2b44075 | 4673 | return; |
d50171e4 PA |
4674 | } |
4675 | ||
7984d532 PA |
4676 | gdb_assert (lwp->suspended >= 0); |
4677 | ||
d50171e4 PA |
4678 | if (lwp->suspended) |
4679 | { | |
c058728c | 4680 | threads_debug_printf (" LWP %ld is suspended", lwpid_of (thread)); |
e2b44075 | 4681 | return; |
d50171e4 PA |
4682 | } |
4683 | ||
1a981360 | 4684 | if (thread->last_resume_kind == resume_stop |
013e3554 | 4685 | && lwp->pending_signals_to_report.empty () |
229d26fc SM |
4686 | && (lwp->collecting_fast_tracepoint |
4687 | == fast_tpoint_collect_result::not_collecting)) | |
02fc4de7 PA |
4688 | { |
4689 | /* We haven't reported this LWP as stopped yet (otherwise, the | |
4690 | last_status.kind check above would catch it, and we wouldn't | |
4691 | reach here. This LWP may have been momentarily paused by a | |
4692 | stop_all_lwps call while handling for example, another LWP's | |
4693 | step-over. In that case, the pending expected SIGSTOP signal | |
4694 | that was queued at vCont;t handling time will have already | |
4695 | been consumed by wait_for_sigstop, and so we need to requeue | |
4696 | another one here. Note that if the LWP already has a SIGSTOP | |
4697 | pending, this is a no-op. */ | |
4698 | ||
c058728c SM |
4699 | threads_debug_printf |
4700 | ("Client wants LWP %ld to stop. Making sure it has a SIGSTOP pending", | |
4701 | lwpid_of (thread)); | |
02fc4de7 PA |
4702 | |
4703 | send_sigstop (lwp); | |
4704 | } | |
4705 | ||
863d01bd PA |
4706 | if (thread->last_resume_kind == resume_step) |
4707 | { | |
c058728c SM |
4708 | threads_debug_printf (" stepping LWP %ld, client wants it stepping", |
4709 | lwpid_of (thread)); | |
8901d193 | 4710 | |
3b9a79ef | 4711 | /* If resume_step is requested by GDB, install single-step |
8901d193 | 4712 | breakpoints when the thread is about to be actually resumed if |
3b9a79ef | 4713 | the single-step breakpoints weren't removed. */ |
7582c77c | 4714 | if (supports_software_single_step () |
3b9a79ef | 4715 | && !has_single_step_breakpoints (thread)) |
8901d193 YQ |
4716 | install_software_single_step_breakpoints (lwp); |
4717 | ||
4718 | step = maybe_hw_step (thread); | |
863d01bd PA |
4719 | } |
4720 | else if (lwp->bp_reinsert != 0) | |
4721 | { | |
c058728c SM |
4722 | threads_debug_printf (" stepping LWP %ld, reinsert set", |
4723 | lwpid_of (thread)); | |
f79b145d YQ |
4724 | |
4725 | step = maybe_hw_step (thread); | |
863d01bd PA |
4726 | } |
4727 | else | |
4728 | step = 0; | |
4729 | ||
df95181f | 4730 | resume_one_lwp (lwp, step, 0, NULL); |
7984d532 PA |
4731 | } |
4732 | ||
df95181f TBA |
4733 | void |
4734 | linux_process_target::unsuspend_and_proceed_one_lwp (thread_info *thread, | |
4735 | lwp_info *except) | |
7984d532 | 4736 | { |
d86d4aaf | 4737 | struct lwp_info *lwp = get_thread_lwp (thread); |
7984d532 PA |
4738 | |
4739 | if (lwp == except) | |
e2b44075 | 4740 | return; |
7984d532 | 4741 | |
863d01bd | 4742 | lwp_suspended_decr (lwp); |
7984d532 | 4743 | |
e2b44075 | 4744 | proceed_one_lwp (thread, except); |
d50171e4 PA |
4745 | } |
4746 | ||
d16f3f6c TBA |
4747 | void |
4748 | linux_process_target::proceed_all_lwps () | |
d50171e4 | 4749 | { |
d86d4aaf | 4750 | struct thread_info *need_step_over; |
d50171e4 PA |
4751 | |
4752 | /* If there is a thread which would otherwise be resumed, which is | |
4753 | stopped at a breakpoint that needs stepping over, then don't | |
4754 | resume any threads - have it step over the breakpoint with all | |
4755 | other threads stopped, then resume all threads again. */ | |
4756 | ||
bf9ae9d8 | 4757 | if (low_supports_breakpoints ()) |
d50171e4 | 4758 | { |
df95181f TBA |
4759 | need_step_over = find_thread ([this] (thread_info *thread) |
4760 | { | |
4761 | return thread_needs_step_over (thread); | |
4762 | }); | |
d50171e4 PA |
4763 | |
4764 | if (need_step_over != NULL) | |
4765 | { | |
c058728c SM |
4766 | threads_debug_printf ("found thread %ld needing a step-over", |
4767 | lwpid_of (need_step_over)); | |
d50171e4 | 4768 | |
d86d4aaf | 4769 | start_step_over (get_thread_lwp (need_step_over)); |
d50171e4 PA |
4770 | return; |
4771 | } | |
4772 | } | |
5544ad89 | 4773 | |
c058728c | 4774 | threads_debug_printf ("Proceeding, no step-over needed"); |
d50171e4 | 4775 | |
df95181f | 4776 | for_each_thread ([this] (thread_info *thread) |
e2b44075 SM |
4777 | { |
4778 | proceed_one_lwp (thread, NULL); | |
4779 | }); | |
d50171e4 PA |
4780 | } |
4781 | ||
d16f3f6c TBA |
4782 | void |
4783 | linux_process_target::unstop_all_lwps (int unsuspend, lwp_info *except) | |
d50171e4 | 4784 | { |
c058728c SM |
4785 | THREADS_SCOPED_DEBUG_ENTER_EXIT; |
4786 | ||
4787 | if (except) | |
4788 | threads_debug_printf ("except=(LWP %ld)", | |
4789 | lwpid_of (get_lwp_thread (except))); | |
4790 | else | |
4791 | threads_debug_printf ("except=nullptr"); | |
5544ad89 | 4792 | |
7984d532 | 4793 | if (unsuspend) |
e2b44075 SM |
4794 | for_each_thread ([&] (thread_info *thread) |
4795 | { | |
4796 | unsuspend_and_proceed_one_lwp (thread, except); | |
4797 | }); | |
7984d532 | 4798 | else |
e2b44075 SM |
4799 | for_each_thread ([&] (thread_info *thread) |
4800 | { | |
4801 | proceed_one_lwp (thread, except); | |
4802 | }); | |
0d62e5e8 DJ |
4803 | } |
4804 | ||
58caa3dc DJ |
4805 | |
4806 | #ifdef HAVE_LINUX_REGSETS | |
4807 | ||
1faeff08 MR |
4808 | #define use_linux_regsets 1 |
4809 | ||
030031ee PA |
4810 | /* Returns true if REGSET has been disabled. */ |
4811 | ||
4812 | static int | |
4813 | regset_disabled (struct regsets_info *info, struct regset_info *regset) | |
4814 | { | |
4815 | return (info->disabled_regsets != NULL | |
4816 | && info->disabled_regsets[regset - info->regsets]); | |
4817 | } | |
4818 | ||
4819 | /* Disable REGSET. */ | |
4820 | ||
4821 | static void | |
4822 | disable_regset (struct regsets_info *info, struct regset_info *regset) | |
4823 | { | |
4824 | int dr_offset; | |
4825 | ||
4826 | dr_offset = regset - info->regsets; | |
4827 | if (info->disabled_regsets == NULL) | |
224c3ddb | 4828 | info->disabled_regsets = (char *) xcalloc (1, info->num_regsets); |
030031ee PA |
4829 | info->disabled_regsets[dr_offset] = 1; |
4830 | } | |
4831 | ||
58caa3dc | 4832 | static int |
3aee8918 PA |
4833 | regsets_fetch_inferior_registers (struct regsets_info *regsets_info, |
4834 | struct regcache *regcache) | |
58caa3dc DJ |
4835 | { |
4836 | struct regset_info *regset; | |
e9d25b98 | 4837 | int saw_general_regs = 0; |
95954743 | 4838 | int pid; |
1570b33e | 4839 | struct iovec iov; |
58caa3dc | 4840 | |
0bfdf32f | 4841 | pid = lwpid_of (current_thread); |
28eef672 | 4842 | for (regset = regsets_info->regsets; regset->size >= 0; regset++) |
58caa3dc | 4843 | { |
1570b33e L |
4844 | void *buf, *data; |
4845 | int nt_type, res; | |
58caa3dc | 4846 | |
030031ee | 4847 | if (regset->size == 0 || regset_disabled (regsets_info, regset)) |
28eef672 | 4848 | continue; |
58caa3dc | 4849 | |
bca929d3 | 4850 | buf = xmalloc (regset->size); |
1570b33e L |
4851 | |
4852 | nt_type = regset->nt_type; | |
4853 | if (nt_type) | |
4854 | { | |
4855 | iov.iov_base = buf; | |
4856 | iov.iov_len = regset->size; | |
4857 | data = (void *) &iov; | |
4858 | } | |
4859 | else | |
4860 | data = buf; | |
4861 | ||
dfb64f85 | 4862 | #ifndef __sparc__ |
f15f9948 | 4863 | res = ptrace (regset->get_request, pid, |
b8e1b30e | 4864 | (PTRACE_TYPE_ARG3) (long) nt_type, data); |
dfb64f85 | 4865 | #else |
1570b33e | 4866 | res = ptrace (regset->get_request, pid, data, nt_type); |
dfb64f85 | 4867 | #endif |
58caa3dc DJ |
4868 | if (res < 0) |
4869 | { | |
1ef53e6b AH |
4870 | if (errno == EIO |
4871 | || (errno == EINVAL && regset->type == OPTIONAL_REGS)) | |
58caa3dc | 4872 | { |
1ef53e6b AH |
4873 | /* If we get EIO on a regset, or an EINVAL and the regset is |
4874 | optional, do not try it again for this process mode. */ | |
030031ee | 4875 | disable_regset (regsets_info, regset); |
58caa3dc | 4876 | } |
e5a9158d AA |
4877 | else if (errno == ENODATA) |
4878 | { | |
4879 | /* ENODATA may be returned if the regset is currently | |
4880 | not "active". This can happen in normal operation, | |
4881 | so suppress the warning in this case. */ | |
4882 | } | |
fcd4a73d YQ |
4883 | else if (errno == ESRCH) |
4884 | { | |
4885 | /* At this point, ESRCH should mean the process is | |
4886 | already gone, in which case we simply ignore attempts | |
4887 | to read its registers. */ | |
4888 | } | |
58caa3dc DJ |
4889 | else |
4890 | { | |
0d62e5e8 | 4891 | char s[256]; |
95954743 PA |
4892 | sprintf (s, "ptrace(regsets_fetch_inferior_registers) PID=%d", |
4893 | pid); | |
0d62e5e8 | 4894 | perror (s); |
58caa3dc DJ |
4895 | } |
4896 | } | |
098dbe61 AA |
4897 | else |
4898 | { | |
4899 | if (regset->type == GENERAL_REGS) | |
4900 | saw_general_regs = 1; | |
4901 | regset->store_function (regcache, buf); | |
4902 | } | |
fdeb2a12 | 4903 | free (buf); |
58caa3dc | 4904 | } |
e9d25b98 DJ |
4905 | if (saw_general_regs) |
4906 | return 0; | |
4907 | else | |
4908 | return 1; | |
58caa3dc DJ |
4909 | } |
4910 | ||
4911 | static int | |
3aee8918 PA |
4912 | regsets_store_inferior_registers (struct regsets_info *regsets_info, |
4913 | struct regcache *regcache) | |
58caa3dc DJ |
4914 | { |
4915 | struct regset_info *regset; | |
e9d25b98 | 4916 | int saw_general_regs = 0; |
95954743 | 4917 | int pid; |
1570b33e | 4918 | struct iovec iov; |
58caa3dc | 4919 | |
0bfdf32f | 4920 | pid = lwpid_of (current_thread); |
28eef672 | 4921 | for (regset = regsets_info->regsets; regset->size >= 0; regset++) |
58caa3dc | 4922 | { |
1570b33e L |
4923 | void *buf, *data; |
4924 | int nt_type, res; | |
58caa3dc | 4925 | |
feea5f36 AA |
4926 | if (regset->size == 0 || regset_disabled (regsets_info, regset) |
4927 | || regset->fill_function == NULL) | |
28eef672 | 4928 | continue; |
58caa3dc | 4929 | |
bca929d3 | 4930 | buf = xmalloc (regset->size); |
545587ee DJ |
4931 | |
4932 | /* First fill the buffer with the current register set contents, | |
4933 | in case there are any items in the kernel's regset that are | |
4934 | not in gdbserver's regcache. */ | |
1570b33e L |
4935 | |
4936 | nt_type = regset->nt_type; | |
4937 | if (nt_type) | |
4938 | { | |
4939 | iov.iov_base = buf; | |
4940 | iov.iov_len = regset->size; | |
4941 | data = (void *) &iov; | |
4942 | } | |
4943 | else | |
4944 | data = buf; | |
4945 | ||
dfb64f85 | 4946 | #ifndef __sparc__ |
f15f9948 | 4947 | res = ptrace (regset->get_request, pid, |
b8e1b30e | 4948 | (PTRACE_TYPE_ARG3) (long) nt_type, data); |
dfb64f85 | 4949 | #else |
689cc2ae | 4950 | res = ptrace (regset->get_request, pid, data, nt_type); |
dfb64f85 | 4951 | #endif |
545587ee DJ |
4952 | |
4953 | if (res == 0) | |
4954 | { | |
4955 | /* Then overlay our cached registers on that. */ | |
442ea881 | 4956 | regset->fill_function (regcache, buf); |
545587ee DJ |
4957 | |
4958 | /* Only now do we write the register set. */ | |
dfb64f85 | 4959 | #ifndef __sparc__ |
f15f9948 | 4960 | res = ptrace (regset->set_request, pid, |
b8e1b30e | 4961 | (PTRACE_TYPE_ARG3) (long) nt_type, data); |
dfb64f85 | 4962 | #else |
1570b33e | 4963 | res = ptrace (regset->set_request, pid, data, nt_type); |
dfb64f85 | 4964 | #endif |
545587ee DJ |
4965 | } |
4966 | ||
58caa3dc DJ |
4967 | if (res < 0) |
4968 | { | |
1ef53e6b AH |
4969 | if (errno == EIO |
4970 | || (errno == EINVAL && regset->type == OPTIONAL_REGS)) | |
58caa3dc | 4971 | { |
1ef53e6b AH |
4972 | /* If we get EIO on a regset, or an EINVAL and the regset is |
4973 | optional, do not try it again for this process mode. */ | |
030031ee | 4974 | disable_regset (regsets_info, regset); |
58caa3dc | 4975 | } |
3221518c UW |
4976 | else if (errno == ESRCH) |
4977 | { | |
1b3f6016 PA |
4978 | /* At this point, ESRCH should mean the process is |
4979 | already gone, in which case we simply ignore attempts | |
4980 | to change its registers. See also the related | |
df95181f | 4981 | comment in resume_one_lwp. */ |
fdeb2a12 | 4982 | free (buf); |
3221518c UW |
4983 | return 0; |
4984 | } | |
58caa3dc DJ |
4985 | else |
4986 | { | |
ce3a066d | 4987 | perror ("Warning: ptrace(regsets_store_inferior_registers)"); |
58caa3dc DJ |
4988 | } |
4989 | } | |
e9d25b98 DJ |
4990 | else if (regset->type == GENERAL_REGS) |
4991 | saw_general_regs = 1; | |
09ec9b38 | 4992 | free (buf); |
58caa3dc | 4993 | } |
e9d25b98 DJ |
4994 | if (saw_general_regs) |
4995 | return 0; | |
4996 | else | |
4997 | return 1; | |
58caa3dc DJ |
4998 | } |
4999 | ||
1faeff08 | 5000 | #else /* !HAVE_LINUX_REGSETS */ |
58caa3dc | 5001 | |
1faeff08 | 5002 | #define use_linux_regsets 0 |
3aee8918 PA |
5003 | #define regsets_fetch_inferior_registers(regsets_info, regcache) 1 |
5004 | #define regsets_store_inferior_registers(regsets_info, regcache) 1 | |
58caa3dc | 5005 | |
58caa3dc | 5006 | #endif |
1faeff08 MR |
5007 | |
5008 | /* Return 1 if register REGNO is supported by one of the regset ptrace | |
5009 | calls or 0 if it has to be transferred individually. */ | |
5010 | ||
5011 | static int | |
3aee8918 | 5012 | linux_register_in_regsets (const struct regs_info *regs_info, int regno) |
1faeff08 MR |
5013 | { |
5014 | unsigned char mask = 1 << (regno % 8); | |
5015 | size_t index = regno / 8; | |
5016 | ||
5017 | return (use_linux_regsets | |
3aee8918 PA |
5018 | && (regs_info->regset_bitmap == NULL |
5019 | || (regs_info->regset_bitmap[index] & mask) != 0)); | |
1faeff08 MR |
5020 | } |
5021 | ||
58caa3dc | 5022 | #ifdef HAVE_LINUX_USRREGS |
1faeff08 | 5023 | |
5b3da067 | 5024 | static int |
3aee8918 | 5025 | register_addr (const struct usrregs_info *usrregs, int regnum) |
1faeff08 MR |
5026 | { |
5027 | int addr; | |
5028 | ||
3aee8918 | 5029 | if (regnum < 0 || regnum >= usrregs->num_regs) |
1faeff08 MR |
5030 | error ("Invalid register number %d.", regnum); |
5031 | ||
3aee8918 | 5032 | addr = usrregs->regmap[regnum]; |
1faeff08 MR |
5033 | |
5034 | return addr; | |
5035 | } | |
5036 | ||
daca57a7 TBA |
5037 | |
5038 | void | |
5039 | linux_process_target::fetch_register (const usrregs_info *usrregs, | |
5040 | regcache *regcache, int regno) | |
1faeff08 MR |
5041 | { |
5042 | CORE_ADDR regaddr; | |
5043 | int i, size; | |
5044 | char *buf; | |
5045 | int pid; | |
5046 | ||
3aee8918 | 5047 | if (regno >= usrregs->num_regs) |
1faeff08 | 5048 | return; |
daca57a7 | 5049 | if (low_cannot_fetch_register (regno)) |
1faeff08 MR |
5050 | return; |
5051 | ||
3aee8918 | 5052 | regaddr = register_addr (usrregs, regno); |
1faeff08 MR |
5053 | if (regaddr == -1) |
5054 | return; | |
5055 | ||
3aee8918 PA |
5056 | size = ((register_size (regcache->tdesc, regno) |
5057 | + sizeof (PTRACE_XFER_TYPE) - 1) | |
1faeff08 | 5058 | & -sizeof (PTRACE_XFER_TYPE)); |
224c3ddb | 5059 | buf = (char *) alloca (size); |
1faeff08 | 5060 | |
0bfdf32f | 5061 | pid = lwpid_of (current_thread); |
1faeff08 MR |
5062 | for (i = 0; i < size; i += sizeof (PTRACE_XFER_TYPE)) |
5063 | { | |
5064 | errno = 0; | |
5065 | *(PTRACE_XFER_TYPE *) (buf + i) = | |
5066 | ptrace (PTRACE_PEEKUSER, pid, | |
5067 | /* Coerce to a uintptr_t first to avoid potential gcc warning | |
5068 | of coercing an 8 byte integer to a 4 byte pointer. */ | |
b8e1b30e | 5069 | (PTRACE_TYPE_ARG3) (uintptr_t) regaddr, (PTRACE_TYPE_ARG4) 0); |
1faeff08 MR |
5070 | regaddr += sizeof (PTRACE_XFER_TYPE); |
5071 | if (errno != 0) | |
9a70f35c YQ |
5072 | { |
5073 | /* Mark register REGNO unavailable. */ | |
5074 | supply_register (regcache, regno, NULL); | |
5075 | return; | |
5076 | } | |
1faeff08 MR |
5077 | } |
5078 | ||
b35db733 | 5079 | low_supply_ptrace_register (regcache, regno, buf); |
1faeff08 MR |
5080 | } |
5081 | ||
daca57a7 TBA |
5082 | void |
5083 | linux_process_target::store_register (const usrregs_info *usrregs, | |
5084 | regcache *regcache, int regno) | |
1faeff08 MR |
5085 | { |
5086 | CORE_ADDR regaddr; | |
5087 | int i, size; | |
5088 | char *buf; | |
5089 | int pid; | |
5090 | ||
3aee8918 | 5091 | if (regno >= usrregs->num_regs) |
1faeff08 | 5092 | return; |
daca57a7 | 5093 | if (low_cannot_store_register (regno)) |
1faeff08 MR |
5094 | return; |
5095 | ||
3aee8918 | 5096 | regaddr = register_addr (usrregs, regno); |
1faeff08 MR |
5097 | if (regaddr == -1) |
5098 | return; | |
5099 | ||
3aee8918 PA |
5100 | size = ((register_size (regcache->tdesc, regno) |
5101 | + sizeof (PTRACE_XFER_TYPE) - 1) | |
1faeff08 | 5102 | & -sizeof (PTRACE_XFER_TYPE)); |
224c3ddb | 5103 | buf = (char *) alloca (size); |
1faeff08 MR |
5104 | memset (buf, 0, size); |
5105 | ||
b35db733 | 5106 | low_collect_ptrace_register (regcache, regno, buf); |
1faeff08 | 5107 | |
0bfdf32f | 5108 | pid = lwpid_of (current_thread); |
1faeff08 MR |
5109 | for (i = 0; i < size; i += sizeof (PTRACE_XFER_TYPE)) |
5110 | { | |
5111 | errno = 0; | |
5112 | ptrace (PTRACE_POKEUSER, pid, | |
5113 | /* Coerce to a uintptr_t first to avoid potential gcc warning | |
5114 | about coercing an 8 byte integer to a 4 byte pointer. */ | |
b8e1b30e LM |
5115 | (PTRACE_TYPE_ARG3) (uintptr_t) regaddr, |
5116 | (PTRACE_TYPE_ARG4) *(PTRACE_XFER_TYPE *) (buf + i)); | |
1faeff08 MR |
5117 | if (errno != 0) |
5118 | { | |
5119 | /* At this point, ESRCH should mean the process is | |
5120 | already gone, in which case we simply ignore attempts | |
5121 | to change its registers. See also the related | |
df95181f | 5122 | comment in resume_one_lwp. */ |
1faeff08 MR |
5123 | if (errno == ESRCH) |
5124 | return; | |
5125 | ||
daca57a7 TBA |
5126 | |
5127 | if (!low_cannot_store_register (regno)) | |
6d91ce9a | 5128 | error ("writing register %d: %s", regno, safe_strerror (errno)); |
1faeff08 MR |
5129 | } |
5130 | regaddr += sizeof (PTRACE_XFER_TYPE); | |
5131 | } | |
5132 | } | |
daca57a7 | 5133 | #endif /* HAVE_LINUX_USRREGS */ |
1faeff08 | 5134 | |
b35db733 TBA |
5135 | void |
5136 | linux_process_target::low_collect_ptrace_register (regcache *regcache, | |
5137 | int regno, char *buf) | |
5138 | { | |
5139 | collect_register (regcache, regno, buf); | |
5140 | } | |
5141 | ||
5142 | void | |
5143 | linux_process_target::low_supply_ptrace_register (regcache *regcache, | |
5144 | int regno, const char *buf) | |
5145 | { | |
5146 | supply_register (regcache, regno, buf); | |
5147 | } | |
5148 | ||
daca57a7 TBA |
5149 | void |
5150 | linux_process_target::usr_fetch_inferior_registers (const regs_info *regs_info, | |
5151 | regcache *regcache, | |
5152 | int regno, int all) | |
1faeff08 | 5153 | { |
daca57a7 | 5154 | #ifdef HAVE_LINUX_USRREGS |
3aee8918 PA |
5155 | struct usrregs_info *usr = regs_info->usrregs; |
5156 | ||
1faeff08 MR |
5157 | if (regno == -1) |
5158 | { | |
3aee8918 PA |
5159 | for (regno = 0; regno < usr->num_regs; regno++) |
5160 | if (all || !linux_register_in_regsets (regs_info, regno)) | |
5161 | fetch_register (usr, regcache, regno); | |
1faeff08 MR |
5162 | } |
5163 | else | |
3aee8918 | 5164 | fetch_register (usr, regcache, regno); |
daca57a7 | 5165 | #endif |
1faeff08 MR |
5166 | } |
5167 | ||
daca57a7 TBA |
5168 | void |
5169 | linux_process_target::usr_store_inferior_registers (const regs_info *regs_info, | |
5170 | regcache *regcache, | |
5171 | int regno, int all) | |
1faeff08 | 5172 | { |
daca57a7 | 5173 | #ifdef HAVE_LINUX_USRREGS |
3aee8918 PA |
5174 | struct usrregs_info *usr = regs_info->usrregs; |
5175 | ||
1faeff08 MR |
5176 | if (regno == -1) |
5177 | { | |
3aee8918 PA |
5178 | for (regno = 0; regno < usr->num_regs; regno++) |
5179 | if (all || !linux_register_in_regsets (regs_info, regno)) | |
5180 | store_register (usr, regcache, regno); | |
1faeff08 MR |
5181 | } |
5182 | else | |
3aee8918 | 5183 | store_register (usr, regcache, regno); |
58caa3dc | 5184 | #endif |
daca57a7 | 5185 | } |
1faeff08 | 5186 | |
a5a4d4cd TBA |
5187 | void |
5188 | linux_process_target::fetch_registers (regcache *regcache, int regno) | |
1faeff08 MR |
5189 | { |
5190 | int use_regsets; | |
5191 | int all = 0; | |
aa8d21c9 | 5192 | const regs_info *regs_info = get_regs_info (); |
1faeff08 MR |
5193 | |
5194 | if (regno == -1) | |
5195 | { | |
bd70b1f2 | 5196 | if (regs_info->usrregs != NULL) |
3aee8918 | 5197 | for (regno = 0; regno < regs_info->usrregs->num_regs; regno++) |
bd70b1f2 | 5198 | low_fetch_register (regcache, regno); |
c14dfd32 | 5199 | |
3aee8918 PA |
5200 | all = regsets_fetch_inferior_registers (regs_info->regsets_info, regcache); |
5201 | if (regs_info->usrregs != NULL) | |
5202 | usr_fetch_inferior_registers (regs_info, regcache, -1, all); | |
1faeff08 MR |
5203 | } |
5204 | else | |
5205 | { | |
bd70b1f2 | 5206 | if (low_fetch_register (regcache, regno)) |
c14dfd32 PA |
5207 | return; |
5208 | ||
3aee8918 | 5209 | use_regsets = linux_register_in_regsets (regs_info, regno); |
1faeff08 | 5210 | if (use_regsets) |
3aee8918 PA |
5211 | all = regsets_fetch_inferior_registers (regs_info->regsets_info, |
5212 | regcache); | |
5213 | if ((!use_regsets || all) && regs_info->usrregs != NULL) | |
5214 | usr_fetch_inferior_registers (regs_info, regcache, regno, 1); | |
1faeff08 | 5215 | } |
58caa3dc DJ |
5216 | } |
5217 | ||
a5a4d4cd TBA |
5218 | void |
5219 | linux_process_target::store_registers (regcache *regcache, int regno) | |
58caa3dc | 5220 | { |
1faeff08 MR |
5221 | int use_regsets; |
5222 | int all = 0; | |
aa8d21c9 | 5223 | const regs_info *regs_info = get_regs_info (); |
1faeff08 MR |
5224 | |
5225 | if (regno == -1) | |
5226 | { | |
3aee8918 PA |
5227 | all = regsets_store_inferior_registers (regs_info->regsets_info, |
5228 | regcache); | |
5229 | if (regs_info->usrregs != NULL) | |
5230 | usr_store_inferior_registers (regs_info, regcache, regno, all); | |
1faeff08 MR |
5231 | } |
5232 | else | |
5233 | { | |
3aee8918 | 5234 | use_regsets = linux_register_in_regsets (regs_info, regno); |
1faeff08 | 5235 | if (use_regsets) |
3aee8918 PA |
5236 | all = regsets_store_inferior_registers (regs_info->regsets_info, |
5237 | regcache); | |
5238 | if ((!use_regsets || all) && regs_info->usrregs != NULL) | |
5239 | usr_store_inferior_registers (regs_info, regcache, regno, 1); | |
1faeff08 | 5240 | } |
58caa3dc DJ |
5241 | } |
5242 | ||
bd70b1f2 TBA |
5243 | bool |
5244 | linux_process_target::low_fetch_register (regcache *regcache, int regno) | |
5245 | { | |
5246 | return false; | |
5247 | } | |
da6d8c04 | 5248 | |
e2558df3 | 5249 | /* A wrapper for the read_memory target op. */ |
da6d8c04 | 5250 | |
c3e735a6 | 5251 | static int |
f450004a | 5252 | linux_read_memory (CORE_ADDR memaddr, unsigned char *myaddr, int len) |
e2558df3 | 5253 | { |
52405d85 | 5254 | return the_target->read_memory (memaddr, myaddr, len); |
e2558df3 TBA |
5255 | } |
5256 | ||
5257 | /* Copy LEN bytes from inferior's memory starting at MEMADDR | |
5258 | to debugger memory starting at MYADDR. */ | |
5259 | ||
5260 | int | |
5261 | linux_process_target::read_memory (CORE_ADDR memaddr, | |
5262 | unsigned char *myaddr, int len) | |
da6d8c04 | 5263 | { |
0bfdf32f | 5264 | int pid = lwpid_of (current_thread); |
ae3e2ccf SM |
5265 | PTRACE_XFER_TYPE *buffer; |
5266 | CORE_ADDR addr; | |
5267 | int count; | |
4934b29e | 5268 | char filename[64]; |
ae3e2ccf | 5269 | int i; |
4934b29e | 5270 | int ret; |
fd462a61 | 5271 | int fd; |
fd462a61 DJ |
5272 | |
5273 | /* Try using /proc. Don't bother for one word. */ | |
5274 | if (len >= 3 * sizeof (long)) | |
5275 | { | |
4934b29e MR |
5276 | int bytes; |
5277 | ||
fd462a61 DJ |
5278 | /* We could keep this file open and cache it - possibly one per |
5279 | thread. That requires some juggling, but is even faster. */ | |
95954743 | 5280 | sprintf (filename, "/proc/%d/mem", pid); |
fd462a61 DJ |
5281 | fd = open (filename, O_RDONLY | O_LARGEFILE); |
5282 | if (fd == -1) | |
5283 | goto no_proc; | |
5284 | ||
5285 | /* If pread64 is available, use it. It's faster if the kernel | |
5286 | supports it (only one syscall), and it's 64-bit safe even on | |
5287 | 32-bit platforms (for instance, SPARC debugging a SPARC64 | |
5288 | application). */ | |
5289 | #ifdef HAVE_PREAD64 | |
4934b29e | 5290 | bytes = pread64 (fd, myaddr, len, memaddr); |
fd462a61 | 5291 | #else |
4934b29e MR |
5292 | bytes = -1; |
5293 | if (lseek (fd, memaddr, SEEK_SET) != -1) | |
5294 | bytes = read (fd, myaddr, len); | |
fd462a61 | 5295 | #endif |
fd462a61 DJ |
5296 | |
5297 | close (fd); | |
4934b29e MR |
5298 | if (bytes == len) |
5299 | return 0; | |
5300 | ||
5301 | /* Some data was read, we'll try to get the rest with ptrace. */ | |
5302 | if (bytes > 0) | |
5303 | { | |
5304 | memaddr += bytes; | |
5305 | myaddr += bytes; | |
5306 | len -= bytes; | |
5307 | } | |
fd462a61 | 5308 | } |
da6d8c04 | 5309 | |
fd462a61 | 5310 | no_proc: |
4934b29e MR |
5311 | /* Round starting address down to longword boundary. */ |
5312 | addr = memaddr & -(CORE_ADDR) sizeof (PTRACE_XFER_TYPE); | |
5313 | /* Round ending address up; get number of longwords that makes. */ | |
5314 | count = ((((memaddr + len) - addr) + sizeof (PTRACE_XFER_TYPE) - 1) | |
5315 | / sizeof (PTRACE_XFER_TYPE)); | |
5316 | /* Allocate buffer of that many longwords. */ | |
8d749320 | 5317 | buffer = XALLOCAVEC (PTRACE_XFER_TYPE, count); |
4934b29e | 5318 | |
da6d8c04 | 5319 | /* Read all the longwords */ |
4934b29e | 5320 | errno = 0; |
da6d8c04 DJ |
5321 | for (i = 0; i < count; i++, addr += sizeof (PTRACE_XFER_TYPE)) |
5322 | { | |
14ce3065 DE |
5323 | /* Coerce the 3rd arg to a uintptr_t first to avoid potential gcc warning |
5324 | about coercing an 8 byte integer to a 4 byte pointer. */ | |
5325 | buffer[i] = ptrace (PTRACE_PEEKTEXT, pid, | |
b8e1b30e LM |
5326 | (PTRACE_TYPE_ARG3) (uintptr_t) addr, |
5327 | (PTRACE_TYPE_ARG4) 0); | |
c3e735a6 | 5328 | if (errno) |
4934b29e | 5329 | break; |
da6d8c04 | 5330 | } |
4934b29e | 5331 | ret = errno; |
da6d8c04 DJ |
5332 | |
5333 | /* Copy appropriate bytes out of the buffer. */ | |
8d409d16 MR |
5334 | if (i > 0) |
5335 | { | |
5336 | i *= sizeof (PTRACE_XFER_TYPE); | |
5337 | i -= memaddr & (sizeof (PTRACE_XFER_TYPE) - 1); | |
5338 | memcpy (myaddr, | |
5339 | (char *) buffer + (memaddr & (sizeof (PTRACE_XFER_TYPE) - 1)), | |
5340 | i < len ? i : len); | |
5341 | } | |
c3e735a6 | 5342 | |
4934b29e | 5343 | return ret; |
da6d8c04 DJ |
5344 | } |
5345 | ||
93ae6fdc PA |
5346 | /* Copy LEN bytes of data from debugger memory at MYADDR to inferior's |
5347 | memory at MEMADDR. On failure (cannot write to the inferior) | |
f0ae6fc3 | 5348 | returns the value of errno. Always succeeds if LEN is zero. */ |
da6d8c04 | 5349 | |
e2558df3 TBA |
5350 | int |
5351 | linux_process_target::write_memory (CORE_ADDR memaddr, | |
5352 | const unsigned char *myaddr, int len) | |
da6d8c04 | 5353 | { |
ae3e2ccf | 5354 | int i; |
da6d8c04 | 5355 | /* Round starting address down to longword boundary. */ |
ae3e2ccf | 5356 | CORE_ADDR addr = memaddr & -(CORE_ADDR) sizeof (PTRACE_XFER_TYPE); |
da6d8c04 | 5357 | /* Round ending address up; get number of longwords that makes. */ |
ae3e2ccf | 5358 | int count |
493e2a69 MS |
5359 | = (((memaddr + len) - addr) + sizeof (PTRACE_XFER_TYPE) - 1) |
5360 | / sizeof (PTRACE_XFER_TYPE); | |
5361 | ||
da6d8c04 | 5362 | /* Allocate buffer of that many longwords. */ |
ae3e2ccf | 5363 | PTRACE_XFER_TYPE *buffer = XALLOCAVEC (PTRACE_XFER_TYPE, count); |
493e2a69 | 5364 | |
0bfdf32f | 5365 | int pid = lwpid_of (current_thread); |
da6d8c04 | 5366 | |
f0ae6fc3 PA |
5367 | if (len == 0) |
5368 | { | |
5369 | /* Zero length write always succeeds. */ | |
5370 | return 0; | |
5371 | } | |
5372 | ||
0d62e5e8 DJ |
5373 | if (debug_threads) |
5374 | { | |
58d6951d | 5375 | /* Dump up to four bytes. */ |
bf47e248 PA |
5376 | char str[4 * 2 + 1]; |
5377 | char *p = str; | |
5378 | int dump = len < 4 ? len : 4; | |
5379 | ||
5380 | for (i = 0; i < dump; i++) | |
5381 | { | |
5382 | sprintf (p, "%02x", myaddr[i]); | |
5383 | p += 2; | |
5384 | } | |
5385 | *p = '\0'; | |
5386 | ||
c058728c SM |
5387 | threads_debug_printf ("Writing %s to 0x%08lx in process %d", |
5388 | str, (long) memaddr, pid); | |
0d62e5e8 DJ |
5389 | } |
5390 | ||
da6d8c04 DJ |
5391 | /* Fill start and end extra bytes of buffer with existing memory data. */ |
5392 | ||
93ae6fdc | 5393 | errno = 0; |
14ce3065 DE |
5394 | /* Coerce the 3rd arg to a uintptr_t first to avoid potential gcc warning |
5395 | about coercing an 8 byte integer to a 4 byte pointer. */ | |
5396 | buffer[0] = ptrace (PTRACE_PEEKTEXT, pid, | |
b8e1b30e LM |
5397 | (PTRACE_TYPE_ARG3) (uintptr_t) addr, |
5398 | (PTRACE_TYPE_ARG4) 0); | |
93ae6fdc PA |
5399 | if (errno) |
5400 | return errno; | |
da6d8c04 DJ |
5401 | |
5402 | if (count > 1) | |
5403 | { | |
93ae6fdc | 5404 | errno = 0; |
da6d8c04 | 5405 | buffer[count - 1] |
95954743 | 5406 | = ptrace (PTRACE_PEEKTEXT, pid, |
14ce3065 DE |
5407 | /* Coerce to a uintptr_t first to avoid potential gcc warning |
5408 | about coercing an 8 byte integer to a 4 byte pointer. */ | |
b8e1b30e | 5409 | (PTRACE_TYPE_ARG3) (uintptr_t) (addr + (count - 1) |
14ce3065 | 5410 | * sizeof (PTRACE_XFER_TYPE)), |
b8e1b30e | 5411 | (PTRACE_TYPE_ARG4) 0); |
93ae6fdc PA |
5412 | if (errno) |
5413 | return errno; | |
da6d8c04 DJ |
5414 | } |
5415 | ||
93ae6fdc | 5416 | /* Copy data to be written over corresponding part of buffer. */ |
da6d8c04 | 5417 | |
493e2a69 MS |
5418 | memcpy ((char *) buffer + (memaddr & (sizeof (PTRACE_XFER_TYPE) - 1)), |
5419 | myaddr, len); | |
da6d8c04 DJ |
5420 | |
5421 | /* Write the entire buffer. */ | |
5422 | ||
5423 | for (i = 0; i < count; i++, addr += sizeof (PTRACE_XFER_TYPE)) | |
5424 | { | |
5425 | errno = 0; | |
14ce3065 DE |
5426 | ptrace (PTRACE_POKETEXT, pid, |
5427 | /* Coerce to a uintptr_t first to avoid potential gcc warning | |
5428 | about coercing an 8 byte integer to a 4 byte pointer. */ | |
b8e1b30e LM |
5429 | (PTRACE_TYPE_ARG3) (uintptr_t) addr, |
5430 | (PTRACE_TYPE_ARG4) buffer[i]); | |
da6d8c04 DJ |
5431 | if (errno) |
5432 | return errno; | |
5433 | } | |
5434 | ||
5435 | return 0; | |
5436 | } | |
2f2893d9 | 5437 | |
2a31c7aa TBA |
5438 | void |
5439 | linux_process_target::look_up_symbols () | |
2f2893d9 | 5440 | { |
0d62e5e8 | 5441 | #ifdef USE_THREAD_DB |
95954743 PA |
5442 | struct process_info *proc = current_process (); |
5443 | ||
fe978cb0 | 5444 | if (proc->priv->thread_db != NULL) |
0d62e5e8 DJ |
5445 | return; |
5446 | ||
9b4c5f87 | 5447 | thread_db_init (); |
0d62e5e8 DJ |
5448 | #endif |
5449 | } | |
5450 | ||
eb497a2a TBA |
5451 | void |
5452 | linux_process_target::request_interrupt () | |
e5379b03 | 5453 | { |
78708b7c PA |
5454 | /* Send a SIGINT to the process group. This acts just like the user |
5455 | typed a ^C on the controlling terminal. */ | |
eb497a2a | 5456 | ::kill (-signal_pid, SIGINT); |
e5379b03 DJ |
5457 | } |
5458 | ||
eac215cc TBA |
5459 | bool |
5460 | linux_process_target::supports_read_auxv () | |
5461 | { | |
5462 | return true; | |
5463 | } | |
5464 | ||
aa691b87 RM |
5465 | /* Copy LEN bytes from inferior's auxiliary vector starting at OFFSET |
5466 | to debugger memory starting at MYADDR. */ | |
5467 | ||
eac215cc TBA |
5468 | int |
5469 | linux_process_target::read_auxv (CORE_ADDR offset, unsigned char *myaddr, | |
5470 | unsigned int len) | |
aa691b87 RM |
5471 | { |
5472 | char filename[PATH_MAX]; | |
5473 | int fd, n; | |
0bfdf32f | 5474 | int pid = lwpid_of (current_thread); |
aa691b87 | 5475 | |
6cebaf6e | 5476 | xsnprintf (filename, sizeof filename, "/proc/%d/auxv", pid); |
aa691b87 RM |
5477 | |
5478 | fd = open (filename, O_RDONLY); | |
5479 | if (fd < 0) | |
5480 | return -1; | |
5481 | ||
5482 | if (offset != (CORE_ADDR) 0 | |
5483 | && lseek (fd, (off_t) offset, SEEK_SET) != (off_t) offset) | |
5484 | n = -1; | |
5485 | else | |
5486 | n = read (fd, myaddr, len); | |
5487 | ||
5488 | close (fd); | |
5489 | ||
5490 | return n; | |
5491 | } | |
5492 | ||
7e0bde70 TBA |
5493 | int |
5494 | linux_process_target::insert_point (enum raw_bkpt_type type, CORE_ADDR addr, | |
5495 | int size, raw_breakpoint *bp) | |
e013ee27 | 5496 | { |
c8f4bfdd YQ |
5497 | if (type == raw_bkpt_type_sw) |
5498 | return insert_memory_breakpoint (bp); | |
e013ee27 | 5499 | else |
9db9aa23 TBA |
5500 | return low_insert_point (type, addr, size, bp); |
5501 | } | |
5502 | ||
5503 | int | |
5504 | linux_process_target::low_insert_point (raw_bkpt_type type, CORE_ADDR addr, | |
5505 | int size, raw_breakpoint *bp) | |
5506 | { | |
5507 | /* Unsupported (see target.h). */ | |
5508 | return 1; | |
e013ee27 OF |
5509 | } |
5510 | ||
7e0bde70 TBA |
5511 | int |
5512 | linux_process_target::remove_point (enum raw_bkpt_type type, CORE_ADDR addr, | |
5513 | int size, raw_breakpoint *bp) | |
e013ee27 | 5514 | { |
c8f4bfdd YQ |
5515 | if (type == raw_bkpt_type_sw) |
5516 | return remove_memory_breakpoint (bp); | |
e013ee27 | 5517 | else |
9db9aa23 TBA |
5518 | return low_remove_point (type, addr, size, bp); |
5519 | } | |
5520 | ||
5521 | int | |
5522 | linux_process_target::low_remove_point (raw_bkpt_type type, CORE_ADDR addr, | |
5523 | int size, raw_breakpoint *bp) | |
5524 | { | |
5525 | /* Unsupported (see target.h). */ | |
5526 | return 1; | |
e013ee27 OF |
5527 | } |
5528 | ||
84320c4e | 5529 | /* Implement the stopped_by_sw_breakpoint target_ops |
3e572f71 PA |
5530 | method. */ |
5531 | ||
84320c4e TBA |
5532 | bool |
5533 | linux_process_target::stopped_by_sw_breakpoint () | |
3e572f71 PA |
5534 | { |
5535 | struct lwp_info *lwp = get_thread_lwp (current_thread); | |
5536 | ||
5537 | return (lwp->stop_reason == TARGET_STOPPED_BY_SW_BREAKPOINT); | |
5538 | } | |
5539 | ||
84320c4e | 5540 | /* Implement the supports_stopped_by_sw_breakpoint target_ops |
3e572f71 PA |
5541 | method. */ |
5542 | ||
84320c4e TBA |
5543 | bool |
5544 | linux_process_target::supports_stopped_by_sw_breakpoint () | |
3e572f71 PA |
5545 | { |
5546 | return USE_SIGTRAP_SIGINFO; | |
5547 | } | |
5548 | ||
93fe88b2 | 5549 | /* Implement the stopped_by_hw_breakpoint target_ops |
3e572f71 PA |
5550 | method. */ |
5551 | ||
93fe88b2 TBA |
5552 | bool |
5553 | linux_process_target::stopped_by_hw_breakpoint () | |
3e572f71 PA |
5554 | { |
5555 | struct lwp_info *lwp = get_thread_lwp (current_thread); | |
5556 | ||
5557 | return (lwp->stop_reason == TARGET_STOPPED_BY_HW_BREAKPOINT); | |
5558 | } | |
5559 | ||
93fe88b2 | 5560 | /* Implement the supports_stopped_by_hw_breakpoint target_ops |
3e572f71 PA |
5561 | method. */ |
5562 | ||
93fe88b2 TBA |
5563 | bool |
5564 | linux_process_target::supports_stopped_by_hw_breakpoint () | |
3e572f71 PA |
5565 | { |
5566 | return USE_SIGTRAP_SIGINFO; | |
5567 | } | |
5568 | ||
70b90b91 | 5569 | /* Implement the supports_hardware_single_step target_ops method. */ |
45614f15 | 5570 | |
22aa6223 TBA |
5571 | bool |
5572 | linux_process_target::supports_hardware_single_step () | |
45614f15 | 5573 | { |
b31cdfa6 | 5574 | return true; |
45614f15 YQ |
5575 | } |
5576 | ||
6eeb5c55 TBA |
5577 | bool |
5578 | linux_process_target::stopped_by_watchpoint () | |
e013ee27 | 5579 | { |
0bfdf32f | 5580 | struct lwp_info *lwp = get_thread_lwp (current_thread); |
c3adc08c | 5581 | |
15c66dd6 | 5582 | return lwp->stop_reason == TARGET_STOPPED_BY_WATCHPOINT; |
e013ee27 OF |
5583 | } |
5584 | ||
6eeb5c55 TBA |
5585 | CORE_ADDR |
5586 | linux_process_target::stopped_data_address () | |
e013ee27 | 5587 | { |
0bfdf32f | 5588 | struct lwp_info *lwp = get_thread_lwp (current_thread); |
c3adc08c PA |
5589 | |
5590 | return lwp->stopped_data_address; | |
e013ee27 OF |
5591 | } |
5592 | ||
db0dfaa0 LM |
5593 | /* This is only used for targets that define PT_TEXT_ADDR, |
5594 | PT_DATA_ADDR and PT_TEXT_END_ADDR. If those are not defined, supposedly | |
5595 | the target has different ways of acquiring this information, like | |
5596 | loadmaps. */ | |
52fb6437 | 5597 | |
5203ae1e TBA |
5598 | bool |
5599 | linux_process_target::supports_read_offsets () | |
5600 | { | |
5601 | #ifdef SUPPORTS_READ_OFFSETS | |
5602 | return true; | |
5603 | #else | |
5604 | return false; | |
5605 | #endif | |
5606 | } | |
5607 | ||
52fb6437 NS |
5608 | /* Under uClinux, programs are loaded at non-zero offsets, which we need |
5609 | to tell gdb about. */ | |
5610 | ||
5203ae1e TBA |
5611 | int |
5612 | linux_process_target::read_offsets (CORE_ADDR *text_p, CORE_ADDR *data_p) | |
52fb6437 | 5613 | { |
5203ae1e | 5614 | #ifdef SUPPORTS_READ_OFFSETS |
52fb6437 | 5615 | unsigned long text, text_end, data; |
62828379 | 5616 | int pid = lwpid_of (current_thread); |
52fb6437 NS |
5617 | |
5618 | errno = 0; | |
5619 | ||
b8e1b30e LM |
5620 | text = ptrace (PTRACE_PEEKUSER, pid, (PTRACE_TYPE_ARG3) PT_TEXT_ADDR, |
5621 | (PTRACE_TYPE_ARG4) 0); | |
5622 | text_end = ptrace (PTRACE_PEEKUSER, pid, (PTRACE_TYPE_ARG3) PT_TEXT_END_ADDR, | |
5623 | (PTRACE_TYPE_ARG4) 0); | |
5624 | data = ptrace (PTRACE_PEEKUSER, pid, (PTRACE_TYPE_ARG3) PT_DATA_ADDR, | |
5625 | (PTRACE_TYPE_ARG4) 0); | |
52fb6437 NS |
5626 | |
5627 | if (errno == 0) | |
5628 | { | |
5629 | /* Both text and data offsets produced at compile-time (and so | |
1b3f6016 PA |
5630 | used by gdb) are relative to the beginning of the program, |
5631 | with the data segment immediately following the text segment. | |
5632 | However, the actual runtime layout in memory may put the data | |
5633 | somewhere else, so when we send gdb a data base-address, we | |
5634 | use the real data base address and subtract the compile-time | |
5635 | data base-address from it (which is just the length of the | |
5636 | text segment). BSS immediately follows data in both | |
5637 | cases. */ | |
52fb6437 NS |
5638 | *text_p = text; |
5639 | *data_p = data - (text_end - text); | |
1b3f6016 | 5640 | |
52fb6437 NS |
5641 | return 1; |
5642 | } | |
5203ae1e TBA |
5643 | return 0; |
5644 | #else | |
5645 | gdb_assert_not_reached ("target op read_offsets not supported"); | |
52fb6437 | 5646 | #endif |
5203ae1e | 5647 | } |
52fb6437 | 5648 | |
6e3fd7e9 TBA |
5649 | bool |
5650 | linux_process_target::supports_get_tls_address () | |
5651 | { | |
5652 | #ifdef USE_THREAD_DB | |
5653 | return true; | |
5654 | #else | |
5655 | return false; | |
5656 | #endif | |
5657 | } | |
5658 | ||
5659 | int | |
5660 | linux_process_target::get_tls_address (thread_info *thread, | |
5661 | CORE_ADDR offset, | |
5662 | CORE_ADDR load_module, | |
5663 | CORE_ADDR *address) | |
5664 | { | |
5665 | #ifdef USE_THREAD_DB | |
5666 | return thread_db_get_tls_address (thread, offset, load_module, address); | |
5667 | #else | |
5668 | return -1; | |
5669 | #endif | |
5670 | } | |
5671 | ||
2d0795ee TBA |
5672 | bool |
5673 | linux_process_target::supports_qxfer_osdata () | |
5674 | { | |
5675 | return true; | |
5676 | } | |
5677 | ||
5678 | int | |
5679 | linux_process_target::qxfer_osdata (const char *annex, | |
5680 | unsigned char *readbuf, | |
5681 | unsigned const char *writebuf, | |
5682 | CORE_ADDR offset, int len) | |
07e059b5 | 5683 | { |
d26e3629 | 5684 | return linux_common_xfer_osdata (annex, readbuf, offset, len); |
07e059b5 VP |
5685 | } |
5686 | ||
cb63de7c TBA |
5687 | void |
5688 | linux_process_target::siginfo_fixup (siginfo_t *siginfo, | |
5689 | gdb_byte *inf_siginfo, int direction) | |
d0722149 | 5690 | { |
cb63de7c | 5691 | bool done = low_siginfo_fixup (siginfo, inf_siginfo, direction); |
d0722149 DE |
5692 | |
5693 | /* If there was no callback, or the callback didn't do anything, | |
5694 | then just do a straight memcpy. */ | |
5695 | if (!done) | |
5696 | { | |
5697 | if (direction == 1) | |
a5362b9a | 5698 | memcpy (siginfo, inf_siginfo, sizeof (siginfo_t)); |
d0722149 | 5699 | else |
a5362b9a | 5700 | memcpy (inf_siginfo, siginfo, sizeof (siginfo_t)); |
d0722149 DE |
5701 | } |
5702 | } | |
5703 | ||
cb63de7c TBA |
5704 | bool |
5705 | linux_process_target::low_siginfo_fixup (siginfo_t *native, gdb_byte *inf, | |
5706 | int direction) | |
5707 | { | |
5708 | return false; | |
5709 | } | |
5710 | ||
d7abedf7 TBA |
5711 | bool |
5712 | linux_process_target::supports_qxfer_siginfo () | |
5713 | { | |
5714 | return true; | |
5715 | } | |
5716 | ||
5717 | int | |
5718 | linux_process_target::qxfer_siginfo (const char *annex, | |
5719 | unsigned char *readbuf, | |
5720 | unsigned const char *writebuf, | |
5721 | CORE_ADDR offset, int len) | |
4aa995e1 | 5722 | { |
d0722149 | 5723 | int pid; |
a5362b9a | 5724 | siginfo_t siginfo; |
8adce034 | 5725 | gdb_byte inf_siginfo[sizeof (siginfo_t)]; |
4aa995e1 | 5726 | |
0bfdf32f | 5727 | if (current_thread == NULL) |
4aa995e1 PA |
5728 | return -1; |
5729 | ||
0bfdf32f | 5730 | pid = lwpid_of (current_thread); |
4aa995e1 | 5731 | |
c058728c SM |
5732 | threads_debug_printf ("%s siginfo for lwp %d.", |
5733 | readbuf != NULL ? "Reading" : "Writing", | |
5734 | pid); | |
4aa995e1 | 5735 | |
0adea5f7 | 5736 | if (offset >= sizeof (siginfo)) |
4aa995e1 PA |
5737 | return -1; |
5738 | ||
b8e1b30e | 5739 | if (ptrace (PTRACE_GETSIGINFO, pid, (PTRACE_TYPE_ARG3) 0, &siginfo) != 0) |
4aa995e1 PA |
5740 | return -1; |
5741 | ||
d0722149 DE |
5742 | /* When GDBSERVER is built as a 64-bit application, ptrace writes into |
5743 | SIGINFO an object with 64-bit layout. Since debugging a 32-bit | |
5744 | inferior with a 64-bit GDBSERVER should look the same as debugging it | |
5745 | with a 32-bit GDBSERVER, we need to convert it. */ | |
5746 | siginfo_fixup (&siginfo, inf_siginfo, 0); | |
5747 | ||
4aa995e1 PA |
5748 | if (offset + len > sizeof (siginfo)) |
5749 | len = sizeof (siginfo) - offset; | |
5750 | ||
5751 | if (readbuf != NULL) | |
d0722149 | 5752 | memcpy (readbuf, inf_siginfo + offset, len); |
4aa995e1 PA |
5753 | else |
5754 | { | |
d0722149 DE |
5755 | memcpy (inf_siginfo + offset, writebuf, len); |
5756 | ||
5757 | /* Convert back to ptrace layout before flushing it out. */ | |
5758 | siginfo_fixup (&siginfo, inf_siginfo, 1); | |
5759 | ||
b8e1b30e | 5760 | if (ptrace (PTRACE_SETSIGINFO, pid, (PTRACE_TYPE_ARG3) 0, &siginfo) != 0) |
4aa995e1 PA |
5761 | return -1; |
5762 | } | |
5763 | ||
5764 | return len; | |
5765 | } | |
5766 | ||
bd99dc85 PA |
5767 | /* SIGCHLD handler that serves two purposes: In non-stop/async mode, |
5768 | so we notice when children change state; as the handler for the | |
5769 | sigsuspend in my_waitpid. */ | |
5770 | ||
5771 | static void | |
5772 | sigchld_handler (int signo) | |
5773 | { | |
5774 | int old_errno = errno; | |
5775 | ||
5776 | if (debug_threads) | |
e581f2b4 PA |
5777 | { |
5778 | do | |
5779 | { | |
a7e559cc AH |
5780 | /* Use the async signal safe debug function. */ |
5781 | if (debug_write ("sigchld_handler\n", | |
5782 | sizeof ("sigchld_handler\n") - 1) < 0) | |
e581f2b4 PA |
5783 | break; /* just ignore */ |
5784 | } while (0); | |
5785 | } | |
bd99dc85 PA |
5786 | |
5787 | if (target_is_async_p ()) | |
5788 | async_file_mark (); /* trigger a linux_wait */ | |
5789 | ||
5790 | errno = old_errno; | |
5791 | } | |
5792 | ||
0dc587d4 TBA |
5793 | bool |
5794 | linux_process_target::supports_non_stop () | |
bd99dc85 | 5795 | { |
0dc587d4 | 5796 | return true; |
bd99dc85 PA |
5797 | } |
5798 | ||
0dc587d4 TBA |
5799 | bool |
5800 | linux_process_target::async (bool enable) | |
bd99dc85 | 5801 | { |
0dc587d4 | 5802 | bool previous = target_is_async_p (); |
bd99dc85 | 5803 | |
c058728c SM |
5804 | threads_debug_printf ("async (%d), previous=%d", |
5805 | enable, previous); | |
8336d594 | 5806 | |
bd99dc85 PA |
5807 | if (previous != enable) |
5808 | { | |
5809 | sigset_t mask; | |
5810 | sigemptyset (&mask); | |
5811 | sigaddset (&mask, SIGCHLD); | |
5812 | ||
21987b9c | 5813 | gdb_sigmask (SIG_BLOCK, &mask, NULL); |
bd99dc85 PA |
5814 | |
5815 | if (enable) | |
5816 | { | |
8674f082 | 5817 | if (!linux_event_pipe.open_pipe ()) |
aa96c426 | 5818 | { |
21987b9c | 5819 | gdb_sigmask (SIG_UNBLOCK, &mask, NULL); |
aa96c426 GB |
5820 | |
5821 | warning ("creating event pipe failed."); | |
5822 | return previous; | |
5823 | } | |
bd99dc85 | 5824 | |
bd99dc85 | 5825 | /* Register the event loop handler. */ |
cdc8e9b2 | 5826 | add_file_handler (linux_event_pipe.event_fd (), |
2554f6f5 SM |
5827 | handle_target_event, NULL, |
5828 | "linux-low"); | |
bd99dc85 PA |
5829 | |
5830 | /* Always trigger a linux_wait. */ | |
5831 | async_file_mark (); | |
5832 | } | |
5833 | else | |
5834 | { | |
cdc8e9b2 | 5835 | delete_file_handler (linux_event_pipe.event_fd ()); |
bd99dc85 | 5836 | |
8674f082 | 5837 | linux_event_pipe.close_pipe (); |
bd99dc85 PA |
5838 | } |
5839 | ||
21987b9c | 5840 | gdb_sigmask (SIG_UNBLOCK, &mask, NULL); |
bd99dc85 PA |
5841 | } |
5842 | ||
5843 | return previous; | |
5844 | } | |
5845 | ||
0dc587d4 TBA |
5846 | int |
5847 | linux_process_target::start_non_stop (bool nonstop) | |
bd99dc85 PA |
5848 | { |
5849 | /* Register or unregister from event-loop accordingly. */ | |
0dc587d4 | 5850 | target_async (nonstop); |
aa96c426 | 5851 | |
0dc587d4 | 5852 | if (target_is_async_p () != (nonstop != false)) |
aa96c426 GB |
5853 | return -1; |
5854 | ||
bd99dc85 PA |
5855 | return 0; |
5856 | } | |
5857 | ||
652aef77 TBA |
5858 | bool |
5859 | linux_process_target::supports_multi_process () | |
cf8fd78b | 5860 | { |
652aef77 | 5861 | return true; |
cf8fd78b PA |
5862 | } |
5863 | ||
89245bc0 DB |
5864 | /* Check if fork events are supported. */ |
5865 | ||
9690a72a TBA |
5866 | bool |
5867 | linux_process_target::supports_fork_events () | |
89245bc0 | 5868 | { |
a2885186 | 5869 | return true; |
89245bc0 DB |
5870 | } |
5871 | ||
5872 | /* Check if vfork events are supported. */ | |
5873 | ||
9690a72a TBA |
5874 | bool |
5875 | linux_process_target::supports_vfork_events () | |
89245bc0 | 5876 | { |
a2885186 | 5877 | return true; |
89245bc0 DB |
5878 | } |
5879 | ||
94585166 DB |
5880 | /* Check if exec events are supported. */ |
5881 | ||
9690a72a TBA |
5882 | bool |
5883 | linux_process_target::supports_exec_events () | |
94585166 | 5884 | { |
a2885186 | 5885 | return true; |
94585166 DB |
5886 | } |
5887 | ||
de0d863e DB |
5888 | /* Target hook for 'handle_new_gdb_connection'. Causes a reset of the |
5889 | ptrace flags for all inferiors. This is in case the new GDB connection | |
5890 | doesn't support the same set of events that the previous one did. */ | |
5891 | ||
fb00dfce TBA |
5892 | void |
5893 | linux_process_target::handle_new_gdb_connection () | |
de0d863e | 5894 | { |
de0d863e | 5895 | /* Request that all the lwps reset their ptrace options. */ |
bbf550d5 SM |
5896 | for_each_thread ([] (thread_info *thread) |
5897 | { | |
5898 | struct lwp_info *lwp = get_thread_lwp (thread); | |
5899 | ||
5900 | if (!lwp->stopped) | |
5901 | { | |
5902 | /* Stop the lwp so we can modify its ptrace options. */ | |
5903 | lwp->must_set_ptrace_flags = 1; | |
5904 | linux_stop_lwp (lwp); | |
5905 | } | |
5906 | else | |
5907 | { | |
5908 | /* Already stopped; go ahead and set the ptrace options. */ | |
5909 | struct process_info *proc = find_process_pid (pid_of (thread)); | |
5910 | int options = linux_low_ptrace_options (proc->attached); | |
5911 | ||
5912 | linux_enable_event_reporting (lwpid_of (thread), options); | |
5913 | lwp->must_set_ptrace_flags = 0; | |
5914 | } | |
5915 | }); | |
de0d863e DB |
5916 | } |
5917 | ||
55cf3021 TBA |
5918 | int |
5919 | linux_process_target::handle_monitor_command (char *mon) | |
5920 | { | |
5921 | #ifdef USE_THREAD_DB | |
5922 | return thread_db_handle_monitor_command (mon); | |
5923 | #else | |
5924 | return 0; | |
5925 | #endif | |
5926 | } | |
5927 | ||
95a45fc1 TBA |
5928 | int |
5929 | linux_process_target::core_of_thread (ptid_t ptid) | |
5930 | { | |
5931 | return linux_common_core_of_thread (ptid); | |
5932 | } | |
5933 | ||
c756403b TBA |
5934 | bool |
5935 | linux_process_target::supports_disable_randomization () | |
03583c20 | 5936 | { |
c756403b | 5937 | return true; |
03583c20 | 5938 | } |
efcbbd14 | 5939 | |
c0245cb9 TBA |
5940 | bool |
5941 | linux_process_target::supports_agent () | |
d1feda86 | 5942 | { |
c0245cb9 | 5943 | return true; |
d1feda86 YQ |
5944 | } |
5945 | ||
2526e0cd TBA |
5946 | bool |
5947 | linux_process_target::supports_range_stepping () | |
c2d6af84 | 5948 | { |
7582c77c | 5949 | if (supports_software_single_step ()) |
2526e0cd | 5950 | return true; |
c2d6af84 | 5951 | |
9cfd8715 TBA |
5952 | return low_supports_range_stepping (); |
5953 | } | |
5954 | ||
5955 | bool | |
5956 | linux_process_target::low_supports_range_stepping () | |
5957 | { | |
5958 | return false; | |
c2d6af84 PA |
5959 | } |
5960 | ||
8247b823 TBA |
5961 | bool |
5962 | linux_process_target::supports_pid_to_exec_file () | |
5963 | { | |
5964 | return true; | |
5965 | } | |
5966 | ||
04977957 | 5967 | const char * |
8247b823 TBA |
5968 | linux_process_target::pid_to_exec_file (int pid) |
5969 | { | |
5970 | return linux_proc_pid_to_exec_file (pid); | |
5971 | } | |
5972 | ||
c9b7b804 TBA |
5973 | bool |
5974 | linux_process_target::supports_multifs () | |
5975 | { | |
5976 | return true; | |
5977 | } | |
5978 | ||
5979 | int | |
5980 | linux_process_target::multifs_open (int pid, const char *filename, | |
5981 | int flags, mode_t mode) | |
5982 | { | |
5983 | return linux_mntns_open_cloexec (pid, filename, flags, mode); | |
5984 | } | |
5985 | ||
5986 | int | |
5987 | linux_process_target::multifs_unlink (int pid, const char *filename) | |
5988 | { | |
5989 | return linux_mntns_unlink (pid, filename); | |
5990 | } | |
5991 | ||
5992 | ssize_t | |
5993 | linux_process_target::multifs_readlink (int pid, const char *filename, | |
5994 | char *buf, size_t bufsiz) | |
5995 | { | |
5996 | return linux_mntns_readlink (pid, filename, buf, bufsiz); | |
5997 | } | |
5998 | ||
723b724b | 5999 | #if defined PT_GETDSBT || defined PTRACE_GETFDPIC |
78d85199 YQ |
6000 | struct target_loadseg |
6001 | { | |
6002 | /* Core address to which the segment is mapped. */ | |
6003 | Elf32_Addr addr; | |
6004 | /* VMA recorded in the program header. */ | |
6005 | Elf32_Addr p_vaddr; | |
6006 | /* Size of this segment in memory. */ | |
6007 | Elf32_Word p_memsz; | |
6008 | }; | |
6009 | ||
723b724b | 6010 | # if defined PT_GETDSBT |
78d85199 YQ |
6011 | struct target_loadmap |
6012 | { | |
6013 | /* Protocol version number, must be zero. */ | |
6014 | Elf32_Word version; | |
6015 | /* Pointer to the DSBT table, its size, and the DSBT index. */ | |
6016 | unsigned *dsbt_table; | |
6017 | unsigned dsbt_size, dsbt_index; | |
6018 | /* Number of segments in this map. */ | |
6019 | Elf32_Word nsegs; | |
6020 | /* The actual memory map. */ | |
6021 | struct target_loadseg segs[/*nsegs*/]; | |
6022 | }; | |
723b724b MF |
6023 | # define LINUX_LOADMAP PT_GETDSBT |
6024 | # define LINUX_LOADMAP_EXEC PTRACE_GETDSBT_EXEC | |
6025 | # define LINUX_LOADMAP_INTERP PTRACE_GETDSBT_INTERP | |
6026 | # else | |
6027 | struct target_loadmap | |
6028 | { | |
6029 | /* Protocol version number, must be zero. */ | |
6030 | Elf32_Half version; | |
6031 | /* Number of segments in this map. */ | |
6032 | Elf32_Half nsegs; | |
6033 | /* The actual memory map. */ | |
6034 | struct target_loadseg segs[/*nsegs*/]; | |
6035 | }; | |
6036 | # define LINUX_LOADMAP PTRACE_GETFDPIC | |
6037 | # define LINUX_LOADMAP_EXEC PTRACE_GETFDPIC_EXEC | |
6038 | # define LINUX_LOADMAP_INTERP PTRACE_GETFDPIC_INTERP | |
6039 | # endif | |
78d85199 | 6040 | |
9da41fda TBA |
6041 | bool |
6042 | linux_process_target::supports_read_loadmap () | |
6043 | { | |
6044 | return true; | |
6045 | } | |
6046 | ||
6047 | int | |
6048 | linux_process_target::read_loadmap (const char *annex, CORE_ADDR offset, | |
6049 | unsigned char *myaddr, unsigned int len) | |
78d85199 | 6050 | { |
0bfdf32f | 6051 | int pid = lwpid_of (current_thread); |
78d85199 YQ |
6052 | int addr = -1; |
6053 | struct target_loadmap *data = NULL; | |
6054 | unsigned int actual_length, copy_length; | |
6055 | ||
6056 | if (strcmp (annex, "exec") == 0) | |
723b724b | 6057 | addr = (int) LINUX_LOADMAP_EXEC; |
78d85199 | 6058 | else if (strcmp (annex, "interp") == 0) |
723b724b | 6059 | addr = (int) LINUX_LOADMAP_INTERP; |
78d85199 YQ |
6060 | else |
6061 | return -1; | |
6062 | ||
723b724b | 6063 | if (ptrace (LINUX_LOADMAP, pid, addr, &data) != 0) |
78d85199 YQ |
6064 | return -1; |
6065 | ||
6066 | if (data == NULL) | |
6067 | return -1; | |
6068 | ||
6069 | actual_length = sizeof (struct target_loadmap) | |
6070 | + sizeof (struct target_loadseg) * data->nsegs; | |
6071 | ||
6072 | if (offset < 0 || offset > actual_length) | |
6073 | return -1; | |
6074 | ||
6075 | copy_length = actual_length - offset < len ? actual_length - offset : len; | |
6076 | memcpy (myaddr, (char *) data + offset, copy_length); | |
6077 | return copy_length; | |
6078 | } | |
723b724b | 6079 | #endif /* defined PT_GETDSBT || defined PTRACE_GETFDPIC */ |
78d85199 | 6080 | |
bc8d3ae4 TBA |
6081 | bool |
6082 | linux_process_target::supports_catch_syscall () | |
82075af2 | 6083 | { |
a2885186 | 6084 | return low_supports_catch_syscall (); |
82075af2 JS |
6085 | } |
6086 | ||
9eedd27d TBA |
6087 | bool |
6088 | linux_process_target::low_supports_catch_syscall () | |
6089 | { | |
6090 | return false; | |
6091 | } | |
6092 | ||
770d8f6a TBA |
6093 | CORE_ADDR |
6094 | linux_process_target::read_pc (regcache *regcache) | |
219f2f23 | 6095 | { |
bf9ae9d8 | 6096 | if (!low_supports_breakpoints ()) |
219f2f23 PA |
6097 | return 0; |
6098 | ||
bf9ae9d8 | 6099 | return low_get_pc (regcache); |
219f2f23 PA |
6100 | } |
6101 | ||
770d8f6a TBA |
6102 | void |
6103 | linux_process_target::write_pc (regcache *regcache, CORE_ADDR pc) | |
219f2f23 | 6104 | { |
bf9ae9d8 | 6105 | gdb_assert (low_supports_breakpoints ()); |
219f2f23 | 6106 | |
bf9ae9d8 | 6107 | low_set_pc (regcache, pc); |
219f2f23 PA |
6108 | } |
6109 | ||
68119632 TBA |
6110 | bool |
6111 | linux_process_target::supports_thread_stopped () | |
6112 | { | |
6113 | return true; | |
6114 | } | |
6115 | ||
6116 | bool | |
6117 | linux_process_target::thread_stopped (thread_info *thread) | |
8336d594 PA |
6118 | { |
6119 | return get_thread_lwp (thread)->stopped; | |
6120 | } | |
6121 | ||
6122 | /* This exposes stop-all-threads functionality to other modules. */ | |
6123 | ||
29e8dc09 TBA |
6124 | void |
6125 | linux_process_target::pause_all (bool freeze) | |
8336d594 | 6126 | { |
7984d532 PA |
6127 | stop_all_lwps (freeze, NULL); |
6128 | } | |
6129 | ||
6130 | /* This exposes unstop-all-threads functionality to other gdbserver | |
6131 | modules. */ | |
6132 | ||
29e8dc09 TBA |
6133 | void |
6134 | linux_process_target::unpause_all (bool unfreeze) | |
7984d532 PA |
6135 | { |
6136 | unstop_all_lwps (unfreeze, NULL); | |
8336d594 PA |
6137 | } |
6138 | ||
79b44087 TBA |
6139 | int |
6140 | linux_process_target::prepare_to_access_memory () | |
90d74c30 PA |
6141 | { |
6142 | /* Neither ptrace nor /proc/PID/mem allow accessing memory through a | |
6143 | running LWP. */ | |
6144 | if (non_stop) | |
29e8dc09 | 6145 | target_pause_all (true); |
90d74c30 PA |
6146 | return 0; |
6147 | } | |
6148 | ||
79b44087 TBA |
6149 | void |
6150 | linux_process_target::done_accessing_memory () | |
90d74c30 PA |
6151 | { |
6152 | /* Neither ptrace nor /proc/PID/mem allow accessing memory through a | |
6153 | running LWP. */ | |
6154 | if (non_stop) | |
29e8dc09 | 6155 | target_unpause_all (true); |
90d74c30 PA |
6156 | } |
6157 | ||
2268b414 JK |
6158 | /* Extract &phdr and num_phdr in the inferior. Return 0 on success. */ |
6159 | ||
6160 | static int | |
6161 | get_phdr_phnum_from_proc_auxv (const int pid, const int is_elf64, | |
6162 | CORE_ADDR *phdr_memaddr, int *num_phdr) | |
6163 | { | |
6164 | char filename[PATH_MAX]; | |
6165 | int fd; | |
6166 | const int auxv_size = is_elf64 | |
6167 | ? sizeof (Elf64_auxv_t) : sizeof (Elf32_auxv_t); | |
6168 | char buf[sizeof (Elf64_auxv_t)]; /* The larger of the two. */ | |
6169 | ||
6170 | xsnprintf (filename, sizeof filename, "/proc/%d/auxv", pid); | |
6171 | ||
6172 | fd = open (filename, O_RDONLY); | |
6173 | if (fd < 0) | |
6174 | return 1; | |
6175 | ||
6176 | *phdr_memaddr = 0; | |
6177 | *num_phdr = 0; | |
6178 | while (read (fd, buf, auxv_size) == auxv_size | |
6179 | && (*phdr_memaddr == 0 || *num_phdr == 0)) | |
6180 | { | |
6181 | if (is_elf64) | |
6182 | { | |
6183 | Elf64_auxv_t *const aux = (Elf64_auxv_t *) buf; | |
6184 | ||
6185 | switch (aux->a_type) | |
6186 | { | |
6187 | case AT_PHDR: | |
6188 | *phdr_memaddr = aux->a_un.a_val; | |
6189 | break; | |
6190 | case AT_PHNUM: | |
6191 | *num_phdr = aux->a_un.a_val; | |
6192 | break; | |
6193 | } | |
6194 | } | |
6195 | else | |
6196 | { | |
6197 | Elf32_auxv_t *const aux = (Elf32_auxv_t *) buf; | |
6198 | ||
6199 | switch (aux->a_type) | |
6200 | { | |
6201 | case AT_PHDR: | |
6202 | *phdr_memaddr = aux->a_un.a_val; | |
6203 | break; | |
6204 | case AT_PHNUM: | |
6205 | *num_phdr = aux->a_un.a_val; | |
6206 | break; | |
6207 | } | |
6208 | } | |
6209 | } | |
6210 | ||
6211 | close (fd); | |
6212 | ||
6213 | if (*phdr_memaddr == 0 || *num_phdr == 0) | |
6214 | { | |
6215 | warning ("Unexpected missing AT_PHDR and/or AT_PHNUM: " | |
6216 | "phdr_memaddr = %ld, phdr_num = %d", | |
6217 | (long) *phdr_memaddr, *num_phdr); | |
6218 | return 2; | |
6219 | } | |
6220 | ||
6221 | return 0; | |
6222 | } | |
6223 | ||
6224 | /* Return &_DYNAMIC (via PT_DYNAMIC) in the inferior, or 0 if not present. */ | |
6225 | ||
6226 | static CORE_ADDR | |
6227 | get_dynamic (const int pid, const int is_elf64) | |
6228 | { | |
6229 | CORE_ADDR phdr_memaddr, relocation; | |
db1ff28b | 6230 | int num_phdr, i; |
2268b414 | 6231 | unsigned char *phdr_buf; |
db1ff28b | 6232 | const int phdr_size = is_elf64 ? sizeof (Elf64_Phdr) : sizeof (Elf32_Phdr); |
2268b414 JK |
6233 | |
6234 | if (get_phdr_phnum_from_proc_auxv (pid, is_elf64, &phdr_memaddr, &num_phdr)) | |
6235 | return 0; | |
6236 | ||
6237 | gdb_assert (num_phdr < 100); /* Basic sanity check. */ | |
224c3ddb | 6238 | phdr_buf = (unsigned char *) alloca (num_phdr * phdr_size); |
2268b414 JK |
6239 | |
6240 | if (linux_read_memory (phdr_memaddr, phdr_buf, num_phdr * phdr_size)) | |
6241 | return 0; | |
6242 | ||
6243 | /* Compute relocation: it is expected to be 0 for "regular" executables, | |
6244 | non-zero for PIE ones. */ | |
6245 | relocation = -1; | |
db1ff28b JK |
6246 | for (i = 0; relocation == -1 && i < num_phdr; i++) |
6247 | if (is_elf64) | |
6248 | { | |
6249 | Elf64_Phdr *const p = (Elf64_Phdr *) (phdr_buf + i * phdr_size); | |
6250 | ||
6251 | if (p->p_type == PT_PHDR) | |
6252 | relocation = phdr_memaddr - p->p_vaddr; | |
6253 | } | |
6254 | else | |
6255 | { | |
6256 | Elf32_Phdr *const p = (Elf32_Phdr *) (phdr_buf + i * phdr_size); | |
6257 | ||
6258 | if (p->p_type == PT_PHDR) | |
6259 | relocation = phdr_memaddr - p->p_vaddr; | |
6260 | } | |
6261 | ||
2268b414 JK |
6262 | if (relocation == -1) |
6263 | { | |
e237a7e2 JK |
6264 | /* PT_PHDR is optional, but necessary for PIE in general. Fortunately |
6265 | any real world executables, including PIE executables, have always | |
6266 | PT_PHDR present. PT_PHDR is not present in some shared libraries or | |
6267 | in fpc (Free Pascal 2.4) binaries but neither of those have a need for | |
6268 | or present DT_DEBUG anyway (fpc binaries are statically linked). | |
6269 | ||
6270 | Therefore if there exists DT_DEBUG there is always also PT_PHDR. | |
6271 | ||
6272 | GDB could find RELOCATION also from AT_ENTRY - e_entry. */ | |
6273 | ||
2268b414 JK |
6274 | return 0; |
6275 | } | |
6276 | ||
db1ff28b JK |
6277 | for (i = 0; i < num_phdr; i++) |
6278 | { | |
6279 | if (is_elf64) | |
6280 | { | |
6281 | Elf64_Phdr *const p = (Elf64_Phdr *) (phdr_buf + i * phdr_size); | |
6282 | ||
6283 | if (p->p_type == PT_DYNAMIC) | |
6284 | return p->p_vaddr + relocation; | |
6285 | } | |
6286 | else | |
6287 | { | |
6288 | Elf32_Phdr *const p = (Elf32_Phdr *) (phdr_buf + i * phdr_size); | |
2268b414 | 6289 | |
db1ff28b JK |
6290 | if (p->p_type == PT_DYNAMIC) |
6291 | return p->p_vaddr + relocation; | |
6292 | } | |
6293 | } | |
2268b414 JK |
6294 | |
6295 | return 0; | |
6296 | } | |
6297 | ||
6298 | /* Return &_r_debug in the inferior, or -1 if not present. Return value | |
367ba2c2 MR |
6299 | can be 0 if the inferior does not yet have the library list initialized. |
6300 | We look for DT_MIPS_RLD_MAP first. MIPS executables use this instead of | |
6301 | DT_DEBUG, although they sometimes contain an unused DT_DEBUG entry too. */ | |
2268b414 JK |
6302 | |
6303 | static CORE_ADDR | |
6304 | get_r_debug (const int pid, const int is_elf64) | |
6305 | { | |
6306 | CORE_ADDR dynamic_memaddr; | |
6307 | const int dyn_size = is_elf64 ? sizeof (Elf64_Dyn) : sizeof (Elf32_Dyn); | |
6308 | unsigned char buf[sizeof (Elf64_Dyn)]; /* The larger of the two. */ | |
367ba2c2 | 6309 | CORE_ADDR map = -1; |
2268b414 JK |
6310 | |
6311 | dynamic_memaddr = get_dynamic (pid, is_elf64); | |
6312 | if (dynamic_memaddr == 0) | |
367ba2c2 | 6313 | return map; |
2268b414 JK |
6314 | |
6315 | while (linux_read_memory (dynamic_memaddr, buf, dyn_size) == 0) | |
6316 | { | |
6317 | if (is_elf64) | |
6318 | { | |
6319 | Elf64_Dyn *const dyn = (Elf64_Dyn *) buf; | |
a738da3a | 6320 | #if defined DT_MIPS_RLD_MAP || defined DT_MIPS_RLD_MAP_REL |
367ba2c2 MR |
6321 | union |
6322 | { | |
6323 | Elf64_Xword map; | |
6324 | unsigned char buf[sizeof (Elf64_Xword)]; | |
6325 | } | |
6326 | rld_map; | |
a738da3a MF |
6327 | #endif |
6328 | #ifdef DT_MIPS_RLD_MAP | |
367ba2c2 MR |
6329 | if (dyn->d_tag == DT_MIPS_RLD_MAP) |
6330 | { | |
6331 | if (linux_read_memory (dyn->d_un.d_val, | |
6332 | rld_map.buf, sizeof (rld_map.buf)) == 0) | |
6333 | return rld_map.map; | |
6334 | else | |
6335 | break; | |
6336 | } | |
75f62ce7 | 6337 | #endif /* DT_MIPS_RLD_MAP */ |
a738da3a MF |
6338 | #ifdef DT_MIPS_RLD_MAP_REL |
6339 | if (dyn->d_tag == DT_MIPS_RLD_MAP_REL) | |
6340 | { | |
6341 | if (linux_read_memory (dyn->d_un.d_val + dynamic_memaddr, | |
6342 | rld_map.buf, sizeof (rld_map.buf)) == 0) | |
6343 | return rld_map.map; | |
6344 | else | |
6345 | break; | |
6346 | } | |
6347 | #endif /* DT_MIPS_RLD_MAP_REL */ | |
2268b414 | 6348 | |
367ba2c2 MR |
6349 | if (dyn->d_tag == DT_DEBUG && map == -1) |
6350 | map = dyn->d_un.d_val; | |
2268b414 JK |
6351 | |
6352 | if (dyn->d_tag == DT_NULL) | |
6353 | break; | |
6354 | } | |
6355 | else | |
6356 | { | |
6357 | Elf32_Dyn *const dyn = (Elf32_Dyn *) buf; | |
a738da3a | 6358 | #if defined DT_MIPS_RLD_MAP || defined DT_MIPS_RLD_MAP_REL |
367ba2c2 MR |
6359 | union |
6360 | { | |
6361 | Elf32_Word map; | |
6362 | unsigned char buf[sizeof (Elf32_Word)]; | |
6363 | } | |
6364 | rld_map; | |
a738da3a MF |
6365 | #endif |
6366 | #ifdef DT_MIPS_RLD_MAP | |
367ba2c2 MR |
6367 | if (dyn->d_tag == DT_MIPS_RLD_MAP) |
6368 | { | |
6369 | if (linux_read_memory (dyn->d_un.d_val, | |
6370 | rld_map.buf, sizeof (rld_map.buf)) == 0) | |
6371 | return rld_map.map; | |
6372 | else | |
6373 | break; | |
6374 | } | |
75f62ce7 | 6375 | #endif /* DT_MIPS_RLD_MAP */ |
a738da3a MF |
6376 | #ifdef DT_MIPS_RLD_MAP_REL |
6377 | if (dyn->d_tag == DT_MIPS_RLD_MAP_REL) | |
6378 | { | |
6379 | if (linux_read_memory (dyn->d_un.d_val + dynamic_memaddr, | |
6380 | rld_map.buf, sizeof (rld_map.buf)) == 0) | |
6381 | return rld_map.map; | |
6382 | else | |
6383 | break; | |
6384 | } | |
6385 | #endif /* DT_MIPS_RLD_MAP_REL */ | |
2268b414 | 6386 | |
367ba2c2 MR |
6387 | if (dyn->d_tag == DT_DEBUG && map == -1) |
6388 | map = dyn->d_un.d_val; | |
2268b414 JK |
6389 | |
6390 | if (dyn->d_tag == DT_NULL) | |
6391 | break; | |
6392 | } | |
6393 | ||
6394 | dynamic_memaddr += dyn_size; | |
6395 | } | |
6396 | ||
367ba2c2 | 6397 | return map; |
2268b414 JK |
6398 | } |
6399 | ||
6400 | /* Read one pointer from MEMADDR in the inferior. */ | |
6401 | ||
6402 | static int | |
6403 | read_one_ptr (CORE_ADDR memaddr, CORE_ADDR *ptr, int ptr_size) | |
6404 | { | |
485f1ee4 PA |
6405 | int ret; |
6406 | ||
6407 | /* Go through a union so this works on either big or little endian | |
6408 | hosts, when the inferior's pointer size is smaller than the size | |
6409 | of CORE_ADDR. It is assumed the inferior's endianness is the | |
6410 | same of the superior's. */ | |
6411 | union | |
6412 | { | |
6413 | CORE_ADDR core_addr; | |
6414 | unsigned int ui; | |
6415 | unsigned char uc; | |
6416 | } addr; | |
6417 | ||
6418 | ret = linux_read_memory (memaddr, &addr.uc, ptr_size); | |
6419 | if (ret == 0) | |
6420 | { | |
6421 | if (ptr_size == sizeof (CORE_ADDR)) | |
6422 | *ptr = addr.core_addr; | |
6423 | else if (ptr_size == sizeof (unsigned int)) | |
6424 | *ptr = addr.ui; | |
6425 | else | |
6426 | gdb_assert_not_reached ("unhandled pointer size"); | |
6427 | } | |
6428 | return ret; | |
2268b414 JK |
6429 | } |
6430 | ||
974387bb TBA |
6431 | bool |
6432 | linux_process_target::supports_qxfer_libraries_svr4 () | |
6433 | { | |
6434 | return true; | |
6435 | } | |
6436 | ||
2268b414 JK |
6437 | struct link_map_offsets |
6438 | { | |
6439 | /* Offset and size of r_debug.r_version. */ | |
6440 | int r_version_offset; | |
6441 | ||
6442 | /* Offset and size of r_debug.r_map. */ | |
6443 | int r_map_offset; | |
6444 | ||
6445 | /* Offset to l_addr field in struct link_map. */ | |
6446 | int l_addr_offset; | |
6447 | ||
6448 | /* Offset to l_name field in struct link_map. */ | |
6449 | int l_name_offset; | |
6450 | ||
6451 | /* Offset to l_ld field in struct link_map. */ | |
6452 | int l_ld_offset; | |
6453 | ||
6454 | /* Offset to l_next field in struct link_map. */ | |
6455 | int l_next_offset; | |
6456 | ||
6457 | /* Offset to l_prev field in struct link_map. */ | |
6458 | int l_prev_offset; | |
6459 | }; | |
6460 | ||
fb723180 | 6461 | /* Construct qXfer:libraries-svr4:read reply. */ |
2268b414 | 6462 | |
974387bb TBA |
6463 | int |
6464 | linux_process_target::qxfer_libraries_svr4 (const char *annex, | |
6465 | unsigned char *readbuf, | |
6466 | unsigned const char *writebuf, | |
6467 | CORE_ADDR offset, int len) | |
2268b414 | 6468 | { |
fe978cb0 | 6469 | struct process_info_private *const priv = current_process ()->priv; |
2268b414 JK |
6470 | char filename[PATH_MAX]; |
6471 | int pid, is_elf64; | |
6472 | ||
6473 | static const struct link_map_offsets lmo_32bit_offsets = | |
6474 | { | |
6475 | 0, /* r_version offset. */ | |
6476 | 4, /* r_debug.r_map offset. */ | |
6477 | 0, /* l_addr offset in link_map. */ | |
6478 | 4, /* l_name offset in link_map. */ | |
6479 | 8, /* l_ld offset in link_map. */ | |
6480 | 12, /* l_next offset in link_map. */ | |
6481 | 16 /* l_prev offset in link_map. */ | |
6482 | }; | |
6483 | ||
6484 | static const struct link_map_offsets lmo_64bit_offsets = | |
6485 | { | |
6486 | 0, /* r_version offset. */ | |
6487 | 8, /* r_debug.r_map offset. */ | |
6488 | 0, /* l_addr offset in link_map. */ | |
6489 | 8, /* l_name offset in link_map. */ | |
6490 | 16, /* l_ld offset in link_map. */ | |
6491 | 24, /* l_next offset in link_map. */ | |
6492 | 32 /* l_prev offset in link_map. */ | |
6493 | }; | |
6494 | const struct link_map_offsets *lmo; | |
214d508e | 6495 | unsigned int machine; |
b1fbec62 GB |
6496 | int ptr_size; |
6497 | CORE_ADDR lm_addr = 0, lm_prev = 0; | |
b1fbec62 GB |
6498 | CORE_ADDR l_name, l_addr, l_ld, l_next, l_prev; |
6499 | int header_done = 0; | |
2268b414 JK |
6500 | |
6501 | if (writebuf != NULL) | |
6502 | return -2; | |
6503 | if (readbuf == NULL) | |
6504 | return -1; | |
6505 | ||
0bfdf32f | 6506 | pid = lwpid_of (current_thread); |
2268b414 | 6507 | xsnprintf (filename, sizeof filename, "/proc/%d/exe", pid); |
214d508e | 6508 | is_elf64 = elf_64_file_p (filename, &machine); |
2268b414 | 6509 | lmo = is_elf64 ? &lmo_64bit_offsets : &lmo_32bit_offsets; |
b1fbec62 | 6510 | ptr_size = is_elf64 ? 8 : 4; |
2268b414 | 6511 | |
b1fbec62 GB |
6512 | while (annex[0] != '\0') |
6513 | { | |
6514 | const char *sep; | |
6515 | CORE_ADDR *addrp; | |
da4ae14a | 6516 | int name_len; |
2268b414 | 6517 | |
b1fbec62 GB |
6518 | sep = strchr (annex, '='); |
6519 | if (sep == NULL) | |
6520 | break; | |
0c5bf5a9 | 6521 | |
da4ae14a TT |
6522 | name_len = sep - annex; |
6523 | if (name_len == 5 && startswith (annex, "start")) | |
b1fbec62 | 6524 | addrp = &lm_addr; |
da4ae14a | 6525 | else if (name_len == 4 && startswith (annex, "prev")) |
b1fbec62 GB |
6526 | addrp = &lm_prev; |
6527 | else | |
6528 | { | |
6529 | annex = strchr (sep, ';'); | |
6530 | if (annex == NULL) | |
6531 | break; | |
6532 | annex++; | |
6533 | continue; | |
6534 | } | |
6535 | ||
6536 | annex = decode_address_to_semicolon (addrp, sep + 1); | |
2268b414 | 6537 | } |
b1fbec62 GB |
6538 | |
6539 | if (lm_addr == 0) | |
2268b414 | 6540 | { |
b1fbec62 GB |
6541 | int r_version = 0; |
6542 | ||
6543 | if (priv->r_debug == 0) | |
6544 | priv->r_debug = get_r_debug (pid, is_elf64); | |
6545 | ||
6546 | /* We failed to find DT_DEBUG. Such situation will not change | |
6547 | for this inferior - do not retry it. Report it to GDB as | |
6548 | E01, see for the reasons at the GDB solib-svr4.c side. */ | |
6549 | if (priv->r_debug == (CORE_ADDR) -1) | |
6550 | return -1; | |
6551 | ||
6552 | if (priv->r_debug != 0) | |
2268b414 | 6553 | { |
b1fbec62 GB |
6554 | if (linux_read_memory (priv->r_debug + lmo->r_version_offset, |
6555 | (unsigned char *) &r_version, | |
6556 | sizeof (r_version)) != 0 | |
4eb629d5 | 6557 | || r_version < 1) |
b1fbec62 GB |
6558 | { |
6559 | warning ("unexpected r_debug version %d", r_version); | |
6560 | } | |
6561 | else if (read_one_ptr (priv->r_debug + lmo->r_map_offset, | |
6562 | &lm_addr, ptr_size) != 0) | |
6563 | { | |
6564 | warning ("unable to read r_map from 0x%lx", | |
6565 | (long) priv->r_debug + lmo->r_map_offset); | |
6566 | } | |
2268b414 | 6567 | } |
b1fbec62 | 6568 | } |
2268b414 | 6569 | |
f6e8a41e | 6570 | std::string document = "<library-list-svr4 version=\"1.0\""; |
b1fbec62 GB |
6571 | |
6572 | while (lm_addr | |
6573 | && read_one_ptr (lm_addr + lmo->l_name_offset, | |
6574 | &l_name, ptr_size) == 0 | |
6575 | && read_one_ptr (lm_addr + lmo->l_addr_offset, | |
6576 | &l_addr, ptr_size) == 0 | |
6577 | && read_one_ptr (lm_addr + lmo->l_ld_offset, | |
6578 | &l_ld, ptr_size) == 0 | |
6579 | && read_one_ptr (lm_addr + lmo->l_prev_offset, | |
6580 | &l_prev, ptr_size) == 0 | |
6581 | && read_one_ptr (lm_addr + lmo->l_next_offset, | |
6582 | &l_next, ptr_size) == 0) | |
6583 | { | |
6584 | unsigned char libname[PATH_MAX]; | |
6585 | ||
6586 | if (lm_prev != l_prev) | |
2268b414 | 6587 | { |
b1fbec62 GB |
6588 | warning ("Corrupted shared library list: 0x%lx != 0x%lx", |
6589 | (long) lm_prev, (long) l_prev); | |
6590 | break; | |
2268b414 JK |
6591 | } |
6592 | ||
d878444c JK |
6593 | /* Ignore the first entry even if it has valid name as the first entry |
6594 | corresponds to the main executable. The first entry should not be | |
6595 | skipped if the dynamic loader was loaded late by a static executable | |
6596 | (see solib-svr4.c parameter ignore_first). But in such case the main | |
6597 | executable does not have PT_DYNAMIC present and this function already | |
6598 | exited above due to failed get_r_debug. */ | |
6599 | if (lm_prev == 0) | |
f6e8a41e | 6600 | string_appendf (document, " main-lm=\"0x%lx\"", (unsigned long) lm_addr); |
d878444c JK |
6601 | else |
6602 | { | |
6603 | /* Not checking for error because reading may stop before | |
6604 | we've got PATH_MAX worth of characters. */ | |
6605 | libname[0] = '\0'; | |
6606 | linux_read_memory (l_name, libname, sizeof (libname) - 1); | |
6607 | libname[sizeof (libname) - 1] = '\0'; | |
6608 | if (libname[0] != '\0') | |
2268b414 | 6609 | { |
d878444c JK |
6610 | if (!header_done) |
6611 | { | |
6612 | /* Terminate `<library-list-svr4'. */ | |
f6e8a41e | 6613 | document += '>'; |
d878444c JK |
6614 | header_done = 1; |
6615 | } | |
2268b414 | 6616 | |
e6a58aa8 SM |
6617 | string_appendf (document, "<library name=\""); |
6618 | xml_escape_text_append (&document, (char *) libname); | |
6619 | string_appendf (document, "\" lm=\"0x%lx\" " | |
f6e8a41e | 6620 | "l_addr=\"0x%lx\" l_ld=\"0x%lx\"/>", |
e6a58aa8 SM |
6621 | (unsigned long) lm_addr, (unsigned long) l_addr, |
6622 | (unsigned long) l_ld); | |
d878444c | 6623 | } |
0afae3cf | 6624 | } |
b1fbec62 GB |
6625 | |
6626 | lm_prev = lm_addr; | |
6627 | lm_addr = l_next; | |
2268b414 JK |
6628 | } |
6629 | ||
b1fbec62 GB |
6630 | if (!header_done) |
6631 | { | |
6632 | /* Empty list; terminate `<library-list-svr4'. */ | |
f6e8a41e | 6633 | document += "/>"; |
b1fbec62 GB |
6634 | } |
6635 | else | |
f6e8a41e | 6636 | document += "</library-list-svr4>"; |
b1fbec62 | 6637 | |
f6e8a41e | 6638 | int document_len = document.length (); |
2268b414 JK |
6639 | if (offset < document_len) |
6640 | document_len -= offset; | |
6641 | else | |
6642 | document_len = 0; | |
6643 | if (len > document_len) | |
6644 | len = document_len; | |
6645 | ||
f6e8a41e | 6646 | memcpy (readbuf, document.data () + offset, len); |
2268b414 JK |
6647 | |
6648 | return len; | |
6649 | } | |
6650 | ||
9accd112 MM |
6651 | #ifdef HAVE_LINUX_BTRACE |
6652 | ||
79597bdd | 6653 | btrace_target_info * |
696c0d5e | 6654 | linux_process_target::enable_btrace (thread_info *tp, |
79597bdd TBA |
6655 | const btrace_config *conf) |
6656 | { | |
696c0d5e | 6657 | return linux_enable_btrace (tp->id, conf); |
79597bdd TBA |
6658 | } |
6659 | ||
969c39fb | 6660 | /* See to_disable_btrace target method. */ |
9accd112 | 6661 | |
79597bdd TBA |
6662 | int |
6663 | linux_process_target::disable_btrace (btrace_target_info *tinfo) | |
969c39fb MM |
6664 | { |
6665 | enum btrace_error err; | |
6666 | ||
6667 | err = linux_disable_btrace (tinfo); | |
6668 | return (err == BTRACE_ERR_NONE ? 0 : -1); | |
6669 | } | |
6670 | ||
bc504a31 | 6671 | /* Encode an Intel Processor Trace configuration. */ |
b20a6524 MM |
6672 | |
6673 | static void | |
6674 | linux_low_encode_pt_config (struct buffer *buffer, | |
6675 | const struct btrace_data_pt_config *config) | |
6676 | { | |
6677 | buffer_grow_str (buffer, "<pt-config>\n"); | |
6678 | ||
6679 | switch (config->cpu.vendor) | |
6680 | { | |
6681 | case CV_INTEL: | |
6682 | buffer_xml_printf (buffer, "<cpu vendor=\"GenuineIntel\" family=\"%u\" " | |
6683 | "model=\"%u\" stepping=\"%u\"/>\n", | |
6684 | config->cpu.family, config->cpu.model, | |
6685 | config->cpu.stepping); | |
6686 | break; | |
6687 | ||
6688 | default: | |
6689 | break; | |
6690 | } | |
6691 | ||
6692 | buffer_grow_str (buffer, "</pt-config>\n"); | |
6693 | } | |
6694 | ||
6695 | /* Encode a raw buffer. */ | |
6696 | ||
6697 | static void | |
6698 | linux_low_encode_raw (struct buffer *buffer, const gdb_byte *data, | |
6699 | unsigned int size) | |
6700 | { | |
6701 | if (size == 0) | |
6702 | return; | |
6703 | ||
268a13a5 | 6704 | /* We use hex encoding - see gdbsupport/rsp-low.h. */ |
b20a6524 MM |
6705 | buffer_grow_str (buffer, "<raw>\n"); |
6706 | ||
6707 | while (size-- > 0) | |
6708 | { | |
6709 | char elem[2]; | |
6710 | ||
6711 | elem[0] = tohex ((*data >> 4) & 0xf); | |
6712 | elem[1] = tohex (*data++ & 0xf); | |
6713 | ||
6714 | buffer_grow (buffer, elem, 2); | |
6715 | } | |
6716 | ||
6717 | buffer_grow_str (buffer, "</raw>\n"); | |
6718 | } | |
6719 | ||
969c39fb MM |
6720 | /* See to_read_btrace target method. */ |
6721 | ||
79597bdd TBA |
6722 | int |
6723 | linux_process_target::read_btrace (btrace_target_info *tinfo, | |
6724 | buffer *buffer, | |
6725 | enum btrace_read_type type) | |
9accd112 | 6726 | { |
734b0e4b | 6727 | struct btrace_data btrace; |
969c39fb | 6728 | enum btrace_error err; |
9accd112 | 6729 | |
969c39fb MM |
6730 | err = linux_read_btrace (&btrace, tinfo, type); |
6731 | if (err != BTRACE_ERR_NONE) | |
6732 | { | |
6733 | if (err == BTRACE_ERR_OVERFLOW) | |
6734 | buffer_grow_str0 (buffer, "E.Overflow."); | |
6735 | else | |
6736 | buffer_grow_str0 (buffer, "E.Generic Error."); | |
6737 | ||
8dcc53b3 | 6738 | return -1; |
969c39fb | 6739 | } |
9accd112 | 6740 | |
734b0e4b MM |
6741 | switch (btrace.format) |
6742 | { | |
6743 | case BTRACE_FORMAT_NONE: | |
6744 | buffer_grow_str0 (buffer, "E.No Trace."); | |
8dcc53b3 | 6745 | return -1; |
734b0e4b MM |
6746 | |
6747 | case BTRACE_FORMAT_BTS: | |
6748 | buffer_grow_str (buffer, "<!DOCTYPE btrace SYSTEM \"btrace.dtd\">\n"); | |
6749 | buffer_grow_str (buffer, "<btrace version=\"1.0\">\n"); | |
9accd112 | 6750 | |
46f29a9a | 6751 | for (const btrace_block &block : *btrace.variant.bts.blocks) |
734b0e4b | 6752 | buffer_xml_printf (buffer, "<block begin=\"0x%s\" end=\"0x%s\"/>\n", |
46f29a9a | 6753 | paddress (block.begin), paddress (block.end)); |
9accd112 | 6754 | |
734b0e4b MM |
6755 | buffer_grow_str0 (buffer, "</btrace>\n"); |
6756 | break; | |
6757 | ||
b20a6524 MM |
6758 | case BTRACE_FORMAT_PT: |
6759 | buffer_grow_str (buffer, "<!DOCTYPE btrace SYSTEM \"btrace.dtd\">\n"); | |
6760 | buffer_grow_str (buffer, "<btrace version=\"1.0\">\n"); | |
6761 | buffer_grow_str (buffer, "<pt>\n"); | |
6762 | ||
6763 | linux_low_encode_pt_config (buffer, &btrace.variant.pt.config); | |
9accd112 | 6764 | |
b20a6524 MM |
6765 | linux_low_encode_raw (buffer, btrace.variant.pt.data, |
6766 | btrace.variant.pt.size); | |
6767 | ||
6768 | buffer_grow_str (buffer, "</pt>\n"); | |
6769 | buffer_grow_str0 (buffer, "</btrace>\n"); | |
6770 | break; | |
6771 | ||
6772 | default: | |
6773 | buffer_grow_str0 (buffer, "E.Unsupported Trace Format."); | |
8dcc53b3 | 6774 | return -1; |
734b0e4b | 6775 | } |
969c39fb MM |
6776 | |
6777 | return 0; | |
9accd112 | 6778 | } |
f4abbc16 MM |
6779 | |
6780 | /* See to_btrace_conf target method. */ | |
6781 | ||
79597bdd TBA |
6782 | int |
6783 | linux_process_target::read_btrace_conf (const btrace_target_info *tinfo, | |
6784 | buffer *buffer) | |
f4abbc16 MM |
6785 | { |
6786 | const struct btrace_config *conf; | |
6787 | ||
6788 | buffer_grow_str (buffer, "<!DOCTYPE btrace-conf SYSTEM \"btrace-conf.dtd\">\n"); | |
6789 | buffer_grow_str (buffer, "<btrace-conf version=\"1.0\">\n"); | |
6790 | ||
6791 | conf = linux_btrace_conf (tinfo); | |
6792 | if (conf != NULL) | |
6793 | { | |
6794 | switch (conf->format) | |
6795 | { | |
6796 | case BTRACE_FORMAT_NONE: | |
6797 | break; | |
6798 | ||
6799 | case BTRACE_FORMAT_BTS: | |
d33501a5 MM |
6800 | buffer_xml_printf (buffer, "<bts"); |
6801 | buffer_xml_printf (buffer, " size=\"0x%x\"", conf->bts.size); | |
6802 | buffer_xml_printf (buffer, " />\n"); | |
f4abbc16 | 6803 | break; |
b20a6524 MM |
6804 | |
6805 | case BTRACE_FORMAT_PT: | |
6806 | buffer_xml_printf (buffer, "<pt"); | |
6807 | buffer_xml_printf (buffer, " size=\"0x%x\"", conf->pt.size); | |
6808 | buffer_xml_printf (buffer, "/>\n"); | |
6809 | break; | |
f4abbc16 MM |
6810 | } |
6811 | } | |
6812 | ||
6813 | buffer_grow_str0 (buffer, "</btrace-conf>\n"); | |
6814 | return 0; | |
6815 | } | |
9accd112 MM |
6816 | #endif /* HAVE_LINUX_BTRACE */ |
6817 | ||
7b669087 GB |
6818 | /* See nat/linux-nat.h. */ |
6819 | ||
6820 | ptid_t | |
6821 | current_lwp_ptid (void) | |
6822 | { | |
6823 | return ptid_of (current_thread); | |
6824 | } | |
6825 | ||
7f63b89b TBA |
6826 | const char * |
6827 | linux_process_target::thread_name (ptid_t thread) | |
6828 | { | |
6829 | return linux_proc_tid_get_name (thread); | |
6830 | } | |
6831 | ||
6832 | #if USE_THREAD_DB | |
6833 | bool | |
6834 | linux_process_target::thread_handle (ptid_t ptid, gdb_byte **handle, | |
6835 | int *handle_len) | |
6836 | { | |
6837 | return thread_db_thread_handle (ptid, handle, handle_len); | |
6838 | } | |
6839 | #endif | |
6840 | ||
7b961964 SM |
6841 | thread_info * |
6842 | linux_process_target::thread_pending_parent (thread_info *thread) | |
6843 | { | |
6844 | lwp_info *parent = get_thread_lwp (thread)->pending_parent (); | |
6845 | ||
6846 | if (parent == nullptr) | |
6847 | return nullptr; | |
6848 | ||
6849 | return get_lwp_thread (parent); | |
6850 | } | |
6851 | ||
df5ad102 SM |
6852 | thread_info * |
6853 | linux_process_target::thread_pending_child (thread_info *thread) | |
6854 | { | |
6855 | lwp_info *child = get_thread_lwp (thread)->pending_child (); | |
6856 | ||
6857 | if (child == nullptr) | |
6858 | return nullptr; | |
6859 | ||
6860 | return get_lwp_thread (child); | |
6861 | } | |
6862 | ||
276d4552 YQ |
6863 | /* Default implementation of linux_target_ops method "set_pc" for |
6864 | 32-bit pc register which is literally named "pc". */ | |
6865 | ||
6866 | void | |
6867 | linux_set_pc_32bit (struct regcache *regcache, CORE_ADDR pc) | |
6868 | { | |
6869 | uint32_t newpc = pc; | |
6870 | ||
6871 | supply_register_by_name (regcache, "pc", &newpc); | |
6872 | } | |
6873 | ||
6874 | /* Default implementation of linux_target_ops method "get_pc" for | |
6875 | 32-bit pc register which is literally named "pc". */ | |
6876 | ||
6877 | CORE_ADDR | |
6878 | linux_get_pc_32bit (struct regcache *regcache) | |
6879 | { | |
6880 | uint32_t pc; | |
6881 | ||
6882 | collect_register_by_name (regcache, "pc", &pc); | |
c058728c | 6883 | threads_debug_printf ("stop pc is 0x%" PRIx32, pc); |
276d4552 YQ |
6884 | return pc; |
6885 | } | |
6886 | ||
6f69e520 YQ |
6887 | /* Default implementation of linux_target_ops method "set_pc" for |
6888 | 64-bit pc register which is literally named "pc". */ | |
6889 | ||
6890 | void | |
6891 | linux_set_pc_64bit (struct regcache *regcache, CORE_ADDR pc) | |
6892 | { | |
6893 | uint64_t newpc = pc; | |
6894 | ||
6895 | supply_register_by_name (regcache, "pc", &newpc); | |
6896 | } | |
6897 | ||
6898 | /* Default implementation of linux_target_ops method "get_pc" for | |
6899 | 64-bit pc register which is literally named "pc". */ | |
6900 | ||
6901 | CORE_ADDR | |
6902 | linux_get_pc_64bit (struct regcache *regcache) | |
6903 | { | |
6904 | uint64_t pc; | |
6905 | ||
6906 | collect_register_by_name (regcache, "pc", &pc); | |
c058728c | 6907 | threads_debug_printf ("stop pc is 0x%" PRIx64, pc); |
6f69e520 YQ |
6908 | return pc; |
6909 | } | |
6910 | ||
0570503d | 6911 | /* See linux-low.h. */ |
974c89e0 | 6912 | |
0570503d PFC |
6913 | int |
6914 | linux_get_auxv (int wordsize, CORE_ADDR match, CORE_ADDR *valp) | |
974c89e0 AH |
6915 | { |
6916 | gdb_byte *data = (gdb_byte *) alloca (2 * wordsize); | |
6917 | int offset = 0; | |
6918 | ||
6919 | gdb_assert (wordsize == 4 || wordsize == 8); | |
6920 | ||
52405d85 | 6921 | while (the_target->read_auxv (offset, data, 2 * wordsize) == 2 * wordsize) |
974c89e0 AH |
6922 | { |
6923 | if (wordsize == 4) | |
6924 | { | |
0570503d | 6925 | uint32_t *data_p = (uint32_t *) data; |
974c89e0 | 6926 | if (data_p[0] == match) |
0570503d PFC |
6927 | { |
6928 | *valp = data_p[1]; | |
6929 | return 1; | |
6930 | } | |
974c89e0 AH |
6931 | } |
6932 | else | |
6933 | { | |
0570503d | 6934 | uint64_t *data_p = (uint64_t *) data; |
974c89e0 | 6935 | if (data_p[0] == match) |
0570503d PFC |
6936 | { |
6937 | *valp = data_p[1]; | |
6938 | return 1; | |
6939 | } | |
974c89e0 AH |
6940 | } |
6941 | ||
6942 | offset += 2 * wordsize; | |
6943 | } | |
6944 | ||
6945 | return 0; | |
6946 | } | |
6947 | ||
6948 | /* See linux-low.h. */ | |
6949 | ||
6950 | CORE_ADDR | |
6951 | linux_get_hwcap (int wordsize) | |
6952 | { | |
0570503d PFC |
6953 | CORE_ADDR hwcap = 0; |
6954 | linux_get_auxv (wordsize, AT_HWCAP, &hwcap); | |
6955 | return hwcap; | |
974c89e0 AH |
6956 | } |
6957 | ||
6958 | /* See linux-low.h. */ | |
6959 | ||
6960 | CORE_ADDR | |
6961 | linux_get_hwcap2 (int wordsize) | |
6962 | { | |
0570503d PFC |
6963 | CORE_ADDR hwcap2 = 0; |
6964 | linux_get_auxv (wordsize, AT_HWCAP2, &hwcap2); | |
6965 | return hwcap2; | |
974c89e0 | 6966 | } |
6f69e520 | 6967 | |
3aee8918 PA |
6968 | #ifdef HAVE_LINUX_REGSETS |
6969 | void | |
6970 | initialize_regsets_info (struct regsets_info *info) | |
6971 | { | |
6972 | for (info->num_regsets = 0; | |
6973 | info->regsets[info->num_regsets].size >= 0; | |
6974 | info->num_regsets++) | |
6975 | ; | |
3aee8918 PA |
6976 | } |
6977 | #endif | |
6978 | ||
da6d8c04 DJ |
6979 | void |
6980 | initialize_low (void) | |
6981 | { | |
bd99dc85 | 6982 | struct sigaction sigchld_action; |
dd373349 | 6983 | |
bd99dc85 | 6984 | memset (&sigchld_action, 0, sizeof (sigchld_action)); |
ef0478f6 | 6985 | set_target_ops (the_linux_target); |
dd373349 | 6986 | |
aa7c7447 | 6987 | linux_ptrace_init_warnings (); |
1b919490 | 6988 | linux_proc_init_warnings (); |
bd99dc85 PA |
6989 | |
6990 | sigchld_action.sa_handler = sigchld_handler; | |
6991 | sigemptyset (&sigchld_action.sa_mask); | |
6992 | sigchld_action.sa_flags = SA_RESTART; | |
6993 | sigaction (SIGCHLD, &sigchld_action, NULL); | |
3aee8918 PA |
6994 | |
6995 | initialize_low_arch (); | |
89245bc0 DB |
6996 | |
6997 | linux_check_ptrace_features (); | |
da6d8c04 | 6998 | } |