]>
Commit | Line | Data |
---|---|---|
da6d8c04 | 1 | /* Low level interface to ptrace, for the remote server for GDB. |
213516ef | 2 | Copyright (C) 1995-2023 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 | ||
8a841a35 PA |
138 | /* Return TRUE if THREAD is the leader thread of the process. */ |
139 | ||
140 | static bool | |
141 | is_leader (thread_info *thread) | |
142 | { | |
143 | ptid_t ptid = ptid_of (thread); | |
144 | return ptid.pid () == ptid.lwp (); | |
145 | } | |
146 | ||
48989498 PA |
147 | /* Return true if we should report thread exit events to GDB, for |
148 | THR. */ | |
149 | ||
150 | static bool | |
151 | report_exit_events_for (thread_info *thr) | |
152 | { | |
153 | client_state &cs = get_client_state (); | |
154 | ||
155 | return (cs.report_thread_events | |
156 | || (thr->thread_options & GDB_THREAD_OPTION_EXIT) != 0); | |
157 | } | |
158 | ||
cff068da GB |
159 | /* LWP accessors. */ |
160 | ||
161 | /* See nat/linux-nat.h. */ | |
162 | ||
163 | ptid_t | |
164 | ptid_of_lwp (struct lwp_info *lwp) | |
165 | { | |
166 | return ptid_of (get_lwp_thread (lwp)); | |
167 | } | |
168 | ||
169 | /* See nat/linux-nat.h. */ | |
170 | ||
4b134ca1 GB |
171 | void |
172 | lwp_set_arch_private_info (struct lwp_info *lwp, | |
173 | struct arch_lwp_info *info) | |
174 | { | |
175 | lwp->arch_private = info; | |
176 | } | |
177 | ||
178 | /* See nat/linux-nat.h. */ | |
179 | ||
180 | struct arch_lwp_info * | |
181 | lwp_arch_private_info (struct lwp_info *lwp) | |
182 | { | |
183 | return lwp->arch_private; | |
184 | } | |
185 | ||
186 | /* See nat/linux-nat.h. */ | |
187 | ||
cff068da GB |
188 | int |
189 | lwp_is_stopped (struct lwp_info *lwp) | |
190 | { | |
191 | return lwp->stopped; | |
192 | } | |
193 | ||
194 | /* See nat/linux-nat.h. */ | |
195 | ||
196 | enum target_stop_reason | |
197 | lwp_stop_reason (struct lwp_info *lwp) | |
198 | { | |
199 | return lwp->stop_reason; | |
200 | } | |
201 | ||
0e00e962 AA |
202 | /* See nat/linux-nat.h. */ |
203 | ||
204 | int | |
205 | lwp_is_stepping (struct lwp_info *lwp) | |
206 | { | |
207 | return lwp->stepping; | |
208 | } | |
209 | ||
05044653 PA |
210 | /* A list of all unknown processes which receive stop signals. Some |
211 | other process will presumably claim each of these as forked | |
212 | children momentarily. */ | |
24a09b5f | 213 | |
05044653 PA |
214 | struct simple_pid_list |
215 | { | |
216 | /* The process ID. */ | |
217 | int pid; | |
218 | ||
219 | /* The status as reported by waitpid. */ | |
220 | int status; | |
221 | ||
222 | /* Next in chain. */ | |
223 | struct simple_pid_list *next; | |
224 | }; | |
05c309a8 | 225 | static struct simple_pid_list *stopped_pids; |
05044653 PA |
226 | |
227 | /* Trivial list manipulation functions to keep track of a list of new | |
228 | stopped processes. */ | |
229 | ||
230 | static void | |
231 | add_to_pid_list (struct simple_pid_list **listp, int pid, int status) | |
232 | { | |
8d749320 | 233 | struct simple_pid_list *new_pid = XNEW (struct simple_pid_list); |
05044653 PA |
234 | |
235 | new_pid->pid = pid; | |
236 | new_pid->status = status; | |
237 | new_pid->next = *listp; | |
238 | *listp = new_pid; | |
239 | } | |
240 | ||
241 | static int | |
242 | pull_pid_from_list (struct simple_pid_list **listp, int pid, int *statusp) | |
243 | { | |
244 | struct simple_pid_list **p; | |
245 | ||
246 | for (p = listp; *p != NULL; p = &(*p)->next) | |
247 | if ((*p)->pid == pid) | |
248 | { | |
249 | struct simple_pid_list *next = (*p)->next; | |
250 | ||
251 | *statusp = (*p)->status; | |
252 | xfree (*p); | |
253 | *p = next; | |
254 | return 1; | |
255 | } | |
256 | return 0; | |
257 | } | |
24a09b5f | 258 | |
bde24c0a PA |
259 | enum stopping_threads_kind |
260 | { | |
261 | /* Not stopping threads presently. */ | |
262 | NOT_STOPPING_THREADS, | |
263 | ||
264 | /* Stopping threads. */ | |
265 | STOPPING_THREADS, | |
266 | ||
267 | /* Stopping and suspending threads. */ | |
268 | STOPPING_AND_SUSPENDING_THREADS | |
269 | }; | |
270 | ||
271 | /* This is set while stop_all_lwps is in effect. */ | |
6bd434d6 | 272 | static stopping_threads_kind stopping_threads = NOT_STOPPING_THREADS; |
0d62e5e8 DJ |
273 | |
274 | /* FIXME make into a target method? */ | |
24a09b5f | 275 | int using_threads = 1; |
24a09b5f | 276 | |
fa593d66 PA |
277 | /* True if we're presently stabilizing threads (moving them out of |
278 | jump pads). */ | |
279 | static int stabilizing_threads; | |
280 | ||
f50bf8e5 | 281 | static void unsuspend_all_lwps (struct lwp_info *except); |
95954743 | 282 | static void mark_lwp_dead (struct lwp_info *lwp, int wstat); |
00db26fa | 283 | static int lwp_is_marked_dead (struct lwp_info *lwp); |
d50171e4 | 284 | static int kill_lwp (unsigned long lwpid, int signo); |
863d01bd | 285 | static void enqueue_pending_signal (struct lwp_info *lwp, int signal, siginfo_t *info); |
ece66d65 | 286 | static int linux_low_ptrace_options (int attached); |
ced2dffb | 287 | static int check_ptrace_stopped_lwp_gone (struct lwp_info *lp); |
d50171e4 | 288 | |
582511be PA |
289 | /* When the event-loop is doing a step-over, this points at the thread |
290 | being stepped. */ | |
6bd434d6 | 291 | static ptid_t step_over_bkpt; |
582511be | 292 | |
bf9ae9d8 TBA |
293 | bool |
294 | linux_process_target::low_supports_breakpoints () | |
295 | { | |
296 | return false; | |
297 | } | |
d50171e4 | 298 | |
bf9ae9d8 TBA |
299 | CORE_ADDR |
300 | linux_process_target::low_get_pc (regcache *regcache) | |
301 | { | |
302 | return 0; | |
303 | } | |
304 | ||
305 | void | |
306 | linux_process_target::low_set_pc (regcache *regcache, CORE_ADDR newpc) | |
d50171e4 | 307 | { |
bf9ae9d8 | 308 | gdb_assert_not_reached ("linux target op low_set_pc is not implemented"); |
d50171e4 | 309 | } |
0d62e5e8 | 310 | |
7582c77c TBA |
311 | std::vector<CORE_ADDR> |
312 | linux_process_target::low_get_next_pcs (regcache *regcache) | |
313 | { | |
314 | gdb_assert_not_reached ("linux target op low_get_next_pcs is not " | |
315 | "implemented"); | |
316 | } | |
317 | ||
d4807ea2 TBA |
318 | int |
319 | linux_process_target::low_decr_pc_after_break () | |
320 | { | |
321 | return 0; | |
322 | } | |
323 | ||
c2d6af84 PA |
324 | /* True if LWP is stopped in its stepping range. */ |
325 | ||
326 | static int | |
327 | lwp_in_step_range (struct lwp_info *lwp) | |
328 | { | |
329 | CORE_ADDR pc = lwp->stop_pc; | |
330 | ||
331 | return (pc >= lwp->step_range_start && pc < lwp->step_range_end); | |
332 | } | |
333 | ||
cdc8e9b2 JB |
334 | /* The event pipe registered as a waitable file in the event loop. */ |
335 | static event_pipe linux_event_pipe; | |
bd99dc85 PA |
336 | |
337 | /* True if we're currently in async mode. */ | |
cdc8e9b2 | 338 | #define target_is_async_p() (linux_event_pipe.is_open ()) |
bd99dc85 | 339 | |
02fc4de7 | 340 | static void send_sigstop (struct lwp_info *lwp); |
bd99dc85 | 341 | |
d0722149 DE |
342 | /* Return non-zero if HEADER is a 64-bit ELF file. */ |
343 | ||
344 | static int | |
214d508e | 345 | elf_64_header_p (const Elf64_Ehdr *header, unsigned int *machine) |
d0722149 | 346 | { |
214d508e L |
347 | if (header->e_ident[EI_MAG0] == ELFMAG0 |
348 | && header->e_ident[EI_MAG1] == ELFMAG1 | |
349 | && header->e_ident[EI_MAG2] == ELFMAG2 | |
350 | && header->e_ident[EI_MAG3] == ELFMAG3) | |
351 | { | |
352 | *machine = header->e_machine; | |
353 | return header->e_ident[EI_CLASS] == ELFCLASS64; | |
354 | ||
355 | } | |
356 | *machine = EM_NONE; | |
357 | return -1; | |
d0722149 DE |
358 | } |
359 | ||
360 | /* Return non-zero if FILE is a 64-bit ELF file, | |
361 | zero if the file is not a 64-bit ELF file, | |
362 | and -1 if the file is not accessible or doesn't exist. */ | |
363 | ||
be07f1a2 | 364 | static int |
214d508e | 365 | elf_64_file_p (const char *file, unsigned int *machine) |
d0722149 | 366 | { |
957f3f49 | 367 | Elf64_Ehdr header; |
d0722149 DE |
368 | int fd; |
369 | ||
370 | fd = open (file, O_RDONLY); | |
371 | if (fd < 0) | |
372 | return -1; | |
373 | ||
374 | if (read (fd, &header, sizeof (header)) != sizeof (header)) | |
375 | { | |
376 | close (fd); | |
377 | return 0; | |
378 | } | |
379 | close (fd); | |
380 | ||
214d508e | 381 | return elf_64_header_p (&header, machine); |
d0722149 DE |
382 | } |
383 | ||
be07f1a2 PA |
384 | /* Accepts an integer PID; Returns true if the executable PID is |
385 | running is a 64-bit ELF file.. */ | |
386 | ||
387 | int | |
214d508e | 388 | linux_pid_exe_is_elf_64_file (int pid, unsigned int *machine) |
be07f1a2 | 389 | { |
d8d2a3ee | 390 | char file[PATH_MAX]; |
be07f1a2 PA |
391 | |
392 | sprintf (file, "/proc/%d/exe", pid); | |
214d508e | 393 | return elf_64_file_p (file, machine); |
be07f1a2 PA |
394 | } |
395 | ||
fd000fb3 TBA |
396 | void |
397 | linux_process_target::delete_lwp (lwp_info *lwp) | |
bd99dc85 | 398 | { |
fa96cb38 PA |
399 | struct thread_info *thr = get_lwp_thread (lwp); |
400 | ||
c058728c | 401 | threads_debug_printf ("deleting %ld", lwpid_of (thr)); |
fa96cb38 PA |
402 | |
403 | remove_thread (thr); | |
466eecee | 404 | |
fd000fb3 | 405 | low_delete_thread (lwp->arch_private); |
466eecee | 406 | |
013e3554 | 407 | delete lwp; |
bd99dc85 PA |
408 | } |
409 | ||
fd000fb3 TBA |
410 | void |
411 | linux_process_target::low_delete_thread (arch_lwp_info *info) | |
412 | { | |
413 | /* Default implementation should be overridden if architecture-specific | |
414 | info is being used. */ | |
415 | gdb_assert (info == nullptr); | |
416 | } | |
95954743 | 417 | |
421490af PA |
418 | /* Open the /proc/PID/mem file for PROC. */ |
419 | ||
420 | static void | |
421 | open_proc_mem_file (process_info *proc) | |
422 | { | |
423 | gdb_assert (proc->priv->mem_fd == -1); | |
424 | ||
425 | char filename[64]; | |
426 | xsnprintf (filename, sizeof filename, "/proc/%d/mem", proc->pid); | |
427 | ||
428 | proc->priv->mem_fd | |
429 | = gdb_open_cloexec (filename, O_RDWR | O_LARGEFILE, 0).release (); | |
430 | } | |
431 | ||
fd000fb3 | 432 | process_info * |
421490af | 433 | linux_process_target::add_linux_process_no_mem_file (int pid, int attached) |
95954743 PA |
434 | { |
435 | struct process_info *proc; | |
436 | ||
95954743 | 437 | proc = add_process (pid, attached); |
8d749320 | 438 | proc->priv = XCNEW (struct process_info_private); |
95954743 | 439 | |
fd000fb3 | 440 | proc->priv->arch_private = low_new_process (); |
421490af PA |
441 | proc->priv->mem_fd = -1; |
442 | ||
443 | return proc; | |
444 | } | |
445 | ||
aa5ca48f | 446 | |
421490af PA |
447 | process_info * |
448 | linux_process_target::add_linux_process (int pid, int attached) | |
449 | { | |
450 | process_info *proc = add_linux_process_no_mem_file (pid, attached); | |
451 | open_proc_mem_file (proc); | |
95954743 PA |
452 | return proc; |
453 | } | |
454 | ||
f551c8ef SM |
455 | void |
456 | linux_process_target::remove_linux_process (process_info *proc) | |
457 | { | |
458 | if (proc->priv->mem_fd >= 0) | |
459 | close (proc->priv->mem_fd); | |
460 | ||
461 | this->low_delete_process (proc->priv->arch_private); | |
462 | ||
463 | xfree (proc->priv); | |
464 | proc->priv = nullptr; | |
465 | ||
466 | remove_process (proc); | |
467 | } | |
468 | ||
fd000fb3 TBA |
469 | arch_process_info * |
470 | linux_process_target::low_new_process () | |
471 | { | |
472 | return nullptr; | |
473 | } | |
474 | ||
475 | void | |
476 | linux_process_target::low_delete_process (arch_process_info *info) | |
477 | { | |
478 | /* Default implementation must be overridden if architecture-specific | |
479 | info exists. */ | |
480 | gdb_assert (info == nullptr); | |
481 | } | |
482 | ||
483 | void | |
484 | linux_process_target::low_new_fork (process_info *parent, process_info *child) | |
485 | { | |
486 | /* Nop. */ | |
487 | } | |
488 | ||
797bcff5 TBA |
489 | void |
490 | linux_process_target::arch_setup_thread (thread_info *thread) | |
94585166 | 491 | { |
24583e45 TBA |
492 | scoped_restore_current_thread restore_thread; |
493 | switch_to_thread (thread); | |
94585166 | 494 | |
797bcff5 | 495 | low_arch_setup (); |
94585166 DB |
496 | } |
497 | ||
d16f3f6c TBA |
498 | int |
499 | linux_process_target::handle_extended_wait (lwp_info **orig_event_lwp, | |
500 | int wstat) | |
24a09b5f | 501 | { |
c12a5089 | 502 | client_state &cs = get_client_state (); |
94585166 | 503 | struct lwp_info *event_lwp = *orig_event_lwp; |
89a5711c | 504 | int event = linux_ptrace_get_extended_event (wstat); |
de0d863e | 505 | struct thread_info *event_thr = get_lwp_thread (event_lwp); |
24a09b5f | 506 | |
183be222 | 507 | gdb_assert (event_lwp->waitstatus.kind () == TARGET_WAITKIND_IGNORE); |
65706a29 | 508 | |
82075af2 JS |
509 | /* All extended events we currently use are mid-syscall. Only |
510 | PTRACE_EVENT_STOP is delivered more like a signal-stop, but | |
511 | you have to be using PTRACE_SEIZE to get that. */ | |
512 | event_lwp->syscall_state = TARGET_WAITKIND_SYSCALL_ENTRY; | |
513 | ||
c269dbdb DB |
514 | if ((event == PTRACE_EVENT_FORK) || (event == PTRACE_EVENT_VFORK) |
515 | || (event == PTRACE_EVENT_CLONE)) | |
24a09b5f DJ |
516 | { |
517 | unsigned long new_pid; | |
05044653 | 518 | int ret, status; |
24a09b5f | 519 | |
de0d863e | 520 | /* Get the pid of the new lwp. */ |
d86d4aaf | 521 | ptrace (PTRACE_GETEVENTMSG, lwpid_of (event_thr), (PTRACE_TYPE_ARG3) 0, |
56f7af9c | 522 | &new_pid); |
24a09b5f DJ |
523 | |
524 | /* If we haven't already seen the new PID stop, wait for it now. */ | |
05044653 | 525 | if (!pull_pid_from_list (&stopped_pids, new_pid, &status)) |
24a09b5f DJ |
526 | { |
527 | /* The new child has a pending SIGSTOP. We can't affect it until it | |
528 | hits the SIGSTOP, but we're already attached. */ | |
529 | ||
97438e3f | 530 | ret = my_waitpid (new_pid, &status, __WALL); |
24a09b5f DJ |
531 | |
532 | if (ret == -1) | |
533 | perror_with_name ("waiting for new child"); | |
534 | else if (ret != new_pid) | |
535 | warning ("wait returned unexpected PID %d", ret); | |
da5898ce | 536 | else if (!WIFSTOPPED (status)) |
24a09b5f DJ |
537 | warning ("wait returned unexpected status 0x%x", status); |
538 | } | |
539 | ||
393a6b59 | 540 | if (debug_threads) |
de0d863e | 541 | { |
393a6b59 PA |
542 | debug_printf ("HEW: Got %s event from LWP %ld, new child is %ld\n", |
543 | (event == PTRACE_EVENT_FORK ? "fork" | |
544 | : event == PTRACE_EVENT_VFORK ? "vfork" | |
545 | : event == PTRACE_EVENT_CLONE ? "clone" | |
546 | : "???"), | |
547 | ptid_of (event_thr).lwp (), | |
548 | new_pid); | |
549 | } | |
550 | ||
551 | ptid_t child_ptid = (event != PTRACE_EVENT_CLONE | |
552 | ? ptid_t (new_pid, new_pid) | |
553 | : ptid_t (ptid_of (event_thr).pid (), new_pid)); | |
de0d863e | 554 | |
393a6b59 PA |
555 | lwp_info *child_lwp = add_lwp (child_ptid); |
556 | gdb_assert (child_lwp != NULL); | |
557 | child_lwp->stopped = 1; | |
558 | if (event != PTRACE_EVENT_CLONE) | |
559 | child_lwp->must_set_ptrace_flags = 1; | |
560 | child_lwp->status_pending_p = 0; | |
de0d863e | 561 | |
393a6b59 | 562 | thread_info *child_thr = get_lwp_thread (child_lwp); |
de0d863e | 563 | |
393a6b59 PA |
564 | /* If we're suspending all threads, leave this one suspended |
565 | too. If the fork/clone parent is stepping over a breakpoint, | |
566 | all other threads have been suspended already. Leave the | |
567 | child suspended too. */ | |
568 | if (stopping_threads == STOPPING_AND_SUSPENDING_THREADS | |
569 | || event_lwp->bp_reinsert != 0) | |
570 | { | |
571 | threads_debug_printf ("leaving child suspended"); | |
572 | child_lwp->suspended = 1; | |
573 | } | |
574 | ||
575 | if (event_lwp->bp_reinsert != 0 | |
576 | && supports_software_single_step () | |
577 | && event == PTRACE_EVENT_VFORK) | |
578 | { | |
579 | /* If we leave single-step breakpoints there, child will | |
580 | hit it, so uninsert single-step breakpoints from parent | |
581 | (and child). Once vfork child is done, reinsert | |
582 | them back to parent. */ | |
583 | uninsert_single_step_breakpoints (event_thr); | |
584 | } | |
585 | ||
586 | if (event != PTRACE_EVENT_CLONE) | |
587 | { | |
de0d863e DB |
588 | /* Add the new process to the tables and clone the breakpoint |
589 | lists of the parent. We need to do this even if the new process | |
590 | will be detached, since we will need the process object and the | |
591 | breakpoints to remove any breakpoints from memory when we | |
592 | detach, and the client side will access registers. */ | |
393a6b59 | 593 | process_info *child_proc = add_linux_process (new_pid, 0); |
de0d863e | 594 | gdb_assert (child_proc != NULL); |
863d01bd | 595 | |
393a6b59 | 596 | process_info *parent_proc = get_thread_process (event_thr); |
de0d863e | 597 | child_proc->attached = parent_proc->attached; |
2e7b624b | 598 | |
63c40ec7 | 599 | clone_all_breakpoints (child_thr, event_thr); |
de0d863e | 600 | |
51a948fd AB |
601 | target_desc_up tdesc = allocate_target_description (); |
602 | copy_target_description (tdesc.get (), parent_proc->tdesc); | |
603 | child_proc->tdesc = tdesc.release (); | |
de0d863e | 604 | |
3a8a0396 | 605 | /* Clone arch-specific process data. */ |
fd000fb3 | 606 | low_new_fork (parent_proc, child_proc); |
393a6b59 | 607 | } |
3a8a0396 | 608 | |
393a6b59 PA |
609 | /* Save fork/clone info in the parent thread. */ |
610 | if (event == PTRACE_EVENT_FORK) | |
611 | event_lwp->waitstatus.set_forked (child_ptid); | |
612 | else if (event == PTRACE_EVENT_VFORK) | |
613 | event_lwp->waitstatus.set_vforked (child_ptid); | |
614 | else if (event == PTRACE_EVENT_CLONE | |
615 | && (event_thr->thread_options & GDB_THREAD_OPTION_CLONE) != 0) | |
616 | event_lwp->waitstatus.set_thread_cloned (child_ptid); | |
617 | ||
618 | if (event != PTRACE_EVENT_CLONE | |
619 | || (event_thr->thread_options & GDB_THREAD_OPTION_CLONE) != 0) | |
620 | { | |
de0d863e | 621 | /* The status_pending field contains bits denoting the |
393a6b59 PA |
622 | extended event, so when the pending event is handled, the |
623 | handler will look at lwp->waitstatus. */ | |
de0d863e DB |
624 | event_lwp->status_pending_p = 1; |
625 | event_lwp->status_pending = wstat; | |
626 | ||
393a6b59 PA |
627 | /* Link the threads until the parent's event is passed on to |
628 | GDB. */ | |
629 | event_lwp->relative = child_lwp; | |
630 | child_lwp->relative = event_lwp; | |
de0d863e DB |
631 | } |
632 | ||
393a6b59 PA |
633 | /* If the parent thread is doing step-over with single-step |
634 | breakpoints, the list of single-step breakpoints are cloned | |
635 | from the parent's. Remove them from the child process. | |
636 | In case of vfork, we'll reinsert them back once vforked | |
637 | child is done. */ | |
638 | if (event_lwp->bp_reinsert != 0 | |
639 | && supports_software_single_step ()) | |
640 | { | |
641 | /* The child process is forked and stopped, so it is safe | |
642 | to access its memory without stopping all other threads | |
643 | from other processes. */ | |
644 | delete_single_step_breakpoints (child_thr); | |
e27d73f6 | 645 | |
393a6b59 PA |
646 | gdb_assert (has_single_step_breakpoints (event_thr)); |
647 | gdb_assert (!has_single_step_breakpoints (child_thr)); | |
648 | } | |
bde24c0a | 649 | |
da5898ce DJ |
650 | /* Normally we will get the pending SIGSTOP. But in some cases |
651 | we might get another signal delivered to the group first. | |
f21cc1a2 | 652 | If we do get another signal, be sure not to lose it. */ |
20ba1ce6 | 653 | if (WSTOPSIG (status) != SIGSTOP) |
da5898ce | 654 | { |
393a6b59 PA |
655 | child_lwp->stop_expected = 1; |
656 | child_lwp->status_pending_p = 1; | |
657 | child_lwp->status_pending = status; | |
da5898ce | 658 | } |
393a6b59 | 659 | else if (event == PTRACE_EVENT_CLONE && cs.report_thread_events) |
65706a29 | 660 | { |
393a6b59 PA |
661 | child_lwp->waitstatus.set_thread_created (); |
662 | child_lwp->status_pending_p = 1; | |
663 | child_lwp->status_pending = status; | |
65706a29 | 664 | } |
de0d863e | 665 | |
393a6b59 PA |
666 | if (event == PTRACE_EVENT_CLONE) |
667 | { | |
a0aad537 | 668 | #ifdef USE_THREAD_DB |
393a6b59 | 669 | thread_db_notice_clone (event_thr, child_ptid); |
a0aad537 | 670 | #endif |
393a6b59 | 671 | } |
86299109 | 672 | |
393a6b59 PA |
673 | if (event == PTRACE_EVENT_CLONE |
674 | && (event_thr->thread_options & GDB_THREAD_OPTION_CLONE) == 0) | |
675 | { | |
676 | threads_debug_printf | |
677 | ("not reporting clone event from LWP %ld, new child is %ld\n", | |
678 | ptid_of (event_thr).lwp (), | |
679 | new_pid); | |
680 | return 1; | |
681 | } | |
682 | ||
683 | /* Leave the child stopped until GDB processes the parent | |
684 | event. */ | |
685 | child_thr->last_resume_kind = resume_stop; | |
686 | child_thr->last_status.set_stopped (GDB_SIGNAL_0); | |
687 | ||
688 | /* Report the event. */ | |
689 | threads_debug_printf | |
690 | ("reporting %s event from LWP %ld, new child is %ld\n", | |
691 | (event == PTRACE_EVENT_FORK ? "fork" | |
692 | : event == PTRACE_EVENT_VFORK ? "vfork" | |
693 | : event == PTRACE_EVENT_CLONE ? "clone" | |
694 | : "???"), | |
695 | ptid_of (event_thr).lwp (), | |
696 | new_pid); | |
697 | return 0; | |
24a09b5f | 698 | } |
c269dbdb DB |
699 | else if (event == PTRACE_EVENT_VFORK_DONE) |
700 | { | |
183be222 | 701 | event_lwp->waitstatus.set_vfork_done (); |
c269dbdb | 702 | |
7582c77c | 703 | if (event_lwp->bp_reinsert != 0 && supports_software_single_step ()) |
2e7b624b | 704 | { |
3b9a79ef | 705 | reinsert_single_step_breakpoints (event_thr); |
2e7b624b | 706 | |
3b9a79ef | 707 | gdb_assert (has_single_step_breakpoints (event_thr)); |
2e7b624b YQ |
708 | } |
709 | ||
c269dbdb DB |
710 | /* Report the event. */ |
711 | return 0; | |
712 | } | |
c12a5089 | 713 | else if (event == PTRACE_EVENT_EXEC && cs.report_exec_events) |
94585166 DB |
714 | { |
715 | struct process_info *proc; | |
f27866ba | 716 | std::vector<int> syscalls_to_catch; |
94585166 DB |
717 | ptid_t event_ptid; |
718 | pid_t event_pid; | |
719 | ||
c058728c SM |
720 | threads_debug_printf ("Got exec event from LWP %ld", |
721 | lwpid_of (event_thr)); | |
94585166 DB |
722 | |
723 | /* Get the event ptid. */ | |
724 | event_ptid = ptid_of (event_thr); | |
e99b03dc | 725 | event_pid = event_ptid.pid (); |
94585166 | 726 | |
82075af2 | 727 | /* Save the syscall list from the execing process. */ |
94585166 | 728 | proc = get_thread_process (event_thr); |
f27866ba | 729 | syscalls_to_catch = std::move (proc->syscalls_to_catch); |
82075af2 JS |
730 | |
731 | /* Delete the execing process and all its threads. */ | |
d16f3f6c | 732 | mourn (proc); |
24583e45 | 733 | switch_to_thread (nullptr); |
94585166 DB |
734 | |
735 | /* Create a new process/lwp/thread. */ | |
fd000fb3 | 736 | proc = add_linux_process (event_pid, 0); |
94585166 DB |
737 | event_lwp = add_lwp (event_ptid); |
738 | event_thr = get_lwp_thread (event_lwp); | |
739 | gdb_assert (current_thread == event_thr); | |
797bcff5 | 740 | arch_setup_thread (event_thr); |
94585166 DB |
741 | |
742 | /* Set the event status. */ | |
183be222 SM |
743 | event_lwp->waitstatus.set_execd |
744 | (make_unique_xstrdup | |
745 | (linux_proc_pid_to_exec_file (lwpid_of (event_thr)))); | |
94585166 DB |
746 | |
747 | /* Mark the exec status as pending. */ | |
748 | event_lwp->stopped = 1; | |
749 | event_lwp->status_pending_p = 1; | |
750 | event_lwp->status_pending = wstat; | |
751 | event_thr->last_resume_kind = resume_continue; | |
183be222 | 752 | event_thr->last_status.set_ignore (); |
94585166 | 753 | |
82075af2 JS |
754 | /* Update syscall state in the new lwp, effectively mid-syscall too. */ |
755 | event_lwp->syscall_state = TARGET_WAITKIND_SYSCALL_ENTRY; | |
756 | ||
757 | /* Restore the list to catch. Don't rely on the client, which is free | |
758 | to avoid sending a new list when the architecture doesn't change. | |
759 | Also, for ANY_SYSCALL, the architecture doesn't really matter. */ | |
f27866ba | 760 | proc->syscalls_to_catch = std::move (syscalls_to_catch); |
82075af2 | 761 | |
94585166 DB |
762 | /* Report the event. */ |
763 | *orig_event_lwp = event_lwp; | |
764 | return 0; | |
765 | } | |
de0d863e | 766 | |
f34652de | 767 | internal_error (_("unknown ptrace event %d"), event); |
24a09b5f DJ |
768 | } |
769 | ||
df95181f TBA |
770 | CORE_ADDR |
771 | linux_process_target::get_pc (lwp_info *lwp) | |
d50171e4 | 772 | { |
a9deee17 PA |
773 | process_info *proc = get_thread_process (get_lwp_thread (lwp)); |
774 | gdb_assert (!proc->starting_up); | |
d50171e4 | 775 | |
bf9ae9d8 | 776 | if (!low_supports_breakpoints ()) |
d50171e4 PA |
777 | return 0; |
778 | ||
24583e45 TBA |
779 | scoped_restore_current_thread restore_thread; |
780 | switch_to_thread (get_lwp_thread (lwp)); | |
d50171e4 | 781 | |
a9deee17 PA |
782 | struct regcache *regcache = get_thread_regcache (current_thread, 1); |
783 | CORE_ADDR pc = low_get_pc (regcache); | |
d50171e4 | 784 | |
c058728c | 785 | threads_debug_printf ("pc is 0x%lx", (long) pc); |
d50171e4 | 786 | |
d50171e4 PA |
787 | return pc; |
788 | } | |
789 | ||
9eedd27d TBA |
790 | void |
791 | linux_process_target::get_syscall_trapinfo (lwp_info *lwp, int *sysno) | |
82075af2 | 792 | { |
82075af2 JS |
793 | struct regcache *regcache; |
794 | ||
24583e45 TBA |
795 | scoped_restore_current_thread restore_thread; |
796 | switch_to_thread (get_lwp_thread (lwp)); | |
82075af2 JS |
797 | |
798 | regcache = get_thread_regcache (current_thread, 1); | |
9eedd27d | 799 | low_get_syscall_trapinfo (regcache, sysno); |
82075af2 | 800 | |
c058728c | 801 | threads_debug_printf ("get_syscall_trapinfo sysno %d", *sysno); |
82075af2 JS |
802 | } |
803 | ||
9eedd27d TBA |
804 | void |
805 | linux_process_target::low_get_syscall_trapinfo (regcache *regcache, int *sysno) | |
806 | { | |
807 | /* By default, report an unknown system call number. */ | |
808 | *sysno = UNKNOWN_SYSCALL; | |
809 | } | |
810 | ||
df95181f TBA |
811 | bool |
812 | linux_process_target::save_stop_reason (lwp_info *lwp) | |
0d62e5e8 | 813 | { |
582511be PA |
814 | CORE_ADDR pc; |
815 | CORE_ADDR sw_breakpoint_pc; | |
3e572f71 PA |
816 | #if USE_SIGTRAP_SIGINFO |
817 | siginfo_t siginfo; | |
818 | #endif | |
d50171e4 | 819 | |
bf9ae9d8 | 820 | if (!low_supports_breakpoints ()) |
df95181f | 821 | return false; |
0d62e5e8 | 822 | |
a9deee17 PA |
823 | process_info *proc = get_thread_process (get_lwp_thread (lwp)); |
824 | if (proc->starting_up) | |
825 | { | |
826 | /* Claim we have the stop PC so that the caller doesn't try to | |
827 | fetch it itself. */ | |
828 | return true; | |
829 | } | |
830 | ||
582511be | 831 | pc = get_pc (lwp); |
d4807ea2 | 832 | sw_breakpoint_pc = pc - low_decr_pc_after_break (); |
d50171e4 | 833 | |
582511be | 834 | /* breakpoint_at reads from the current thread. */ |
24583e45 TBA |
835 | scoped_restore_current_thread restore_thread; |
836 | switch_to_thread (get_lwp_thread (lwp)); | |
47c0c975 | 837 | |
3e572f71 PA |
838 | #if USE_SIGTRAP_SIGINFO |
839 | if (ptrace (PTRACE_GETSIGINFO, lwpid_of (current_thread), | |
840 | (PTRACE_TYPE_ARG3) 0, &siginfo) == 0) | |
841 | { | |
842 | if (siginfo.si_signo == SIGTRAP) | |
843 | { | |
e7ad2f14 PA |
844 | if (GDB_ARCH_IS_TRAP_BRKPT (siginfo.si_code) |
845 | && GDB_ARCH_IS_TRAP_HWBKPT (siginfo.si_code)) | |
3e572f71 | 846 | { |
e7ad2f14 PA |
847 | /* The si_code is ambiguous on this arch -- check debug |
848 | registers. */ | |
849 | if (!check_stopped_by_watchpoint (lwp)) | |
850 | lwp->stop_reason = TARGET_STOPPED_BY_SW_BREAKPOINT; | |
851 | } | |
852 | else if (GDB_ARCH_IS_TRAP_BRKPT (siginfo.si_code)) | |
853 | { | |
854 | /* If we determine the LWP stopped for a SW breakpoint, | |
855 | trust it. Particularly don't check watchpoint | |
856 | registers, because at least on s390, we'd find | |
857 | stopped-by-watchpoint as long as there's a watchpoint | |
858 | set. */ | |
3e572f71 | 859 | lwp->stop_reason = TARGET_STOPPED_BY_SW_BREAKPOINT; |
3e572f71 | 860 | } |
e7ad2f14 | 861 | else if (GDB_ARCH_IS_TRAP_HWBKPT (siginfo.si_code)) |
3e572f71 | 862 | { |
e7ad2f14 PA |
863 | /* This can indicate either a hardware breakpoint or |
864 | hardware watchpoint. Check debug registers. */ | |
865 | if (!check_stopped_by_watchpoint (lwp)) | |
866 | lwp->stop_reason = TARGET_STOPPED_BY_HW_BREAKPOINT; | |
3e572f71 | 867 | } |
2bf6fb9d PA |
868 | else if (siginfo.si_code == TRAP_TRACE) |
869 | { | |
e7ad2f14 PA |
870 | /* We may have single stepped an instruction that |
871 | triggered a watchpoint. In that case, on some | |
872 | architectures (such as x86), instead of TRAP_HWBKPT, | |
873 | si_code indicates TRAP_TRACE, and we need to check | |
874 | the debug registers separately. */ | |
875 | if (!check_stopped_by_watchpoint (lwp)) | |
876 | lwp->stop_reason = TARGET_STOPPED_BY_SINGLE_STEP; | |
2bf6fb9d | 877 | } |
3e572f71 PA |
878 | } |
879 | } | |
880 | #else | |
582511be PA |
881 | /* We may have just stepped a breakpoint instruction. E.g., in |
882 | non-stop mode, GDB first tells the thread A to step a range, and | |
883 | then the user inserts a breakpoint inside the range. In that | |
8090aef2 PA |
884 | case we need to report the breakpoint PC. */ |
885 | if ((!lwp->stepping || lwp->stop_pc == sw_breakpoint_pc) | |
d7146cda | 886 | && low_breakpoint_at (sw_breakpoint_pc)) |
e7ad2f14 PA |
887 | lwp->stop_reason = TARGET_STOPPED_BY_SW_BREAKPOINT; |
888 | ||
889 | if (hardware_breakpoint_inserted_here (pc)) | |
890 | lwp->stop_reason = TARGET_STOPPED_BY_HW_BREAKPOINT; | |
891 | ||
892 | if (lwp->stop_reason == TARGET_STOPPED_BY_NO_REASON) | |
893 | check_stopped_by_watchpoint (lwp); | |
894 | #endif | |
895 | ||
896 | if (lwp->stop_reason == TARGET_STOPPED_BY_SW_BREAKPOINT) | |
582511be | 897 | { |
c058728c SM |
898 | threads_debug_printf |
899 | ("%s stopped by software breakpoint", | |
900 | target_pid_to_str (ptid_of (get_lwp_thread (lwp))).c_str ()); | |
582511be PA |
901 | |
902 | /* Back up the PC if necessary. */ | |
903 | if (pc != sw_breakpoint_pc) | |
e7ad2f14 | 904 | { |
582511be PA |
905 | struct regcache *regcache |
906 | = get_thread_regcache (current_thread, 1); | |
bf9ae9d8 | 907 | low_set_pc (regcache, sw_breakpoint_pc); |
582511be PA |
908 | } |
909 | ||
e7ad2f14 PA |
910 | /* Update this so we record the correct stop PC below. */ |
911 | pc = sw_breakpoint_pc; | |
582511be | 912 | } |
e7ad2f14 | 913 | else if (lwp->stop_reason == TARGET_STOPPED_BY_HW_BREAKPOINT) |
c058728c SM |
914 | threads_debug_printf |
915 | ("%s stopped by hardware breakpoint", | |
916 | target_pid_to_str (ptid_of (get_lwp_thread (lwp))).c_str ()); | |
e7ad2f14 | 917 | else if (lwp->stop_reason == TARGET_STOPPED_BY_WATCHPOINT) |
c058728c SM |
918 | threads_debug_printf |
919 | ("%s stopped by hardware watchpoint", | |
920 | target_pid_to_str (ptid_of (get_lwp_thread (lwp))).c_str ()); | |
e7ad2f14 | 921 | else if (lwp->stop_reason == TARGET_STOPPED_BY_SINGLE_STEP) |
c058728c SM |
922 | threads_debug_printf |
923 | ("%s stopped by trace", | |
924 | target_pid_to_str (ptid_of (get_lwp_thread (lwp))).c_str ()); | |
e7ad2f14 PA |
925 | |
926 | lwp->stop_pc = pc; | |
df95181f | 927 | return true; |
0d62e5e8 | 928 | } |
ce3a066d | 929 | |
fd000fb3 TBA |
930 | lwp_info * |
931 | linux_process_target::add_lwp (ptid_t ptid) | |
611cb4a5 | 932 | { |
c360a473 | 933 | lwp_info *lwp = new lwp_info; |
0d62e5e8 | 934 | |
754e3168 AH |
935 | lwp->thread = add_thread (ptid, lwp); |
936 | ||
fd000fb3 | 937 | low_new_thread (lwp); |
aa5ca48f | 938 | |
54a0b537 | 939 | return lwp; |
0d62e5e8 | 940 | } |
611cb4a5 | 941 | |
fd000fb3 TBA |
942 | void |
943 | linux_process_target::low_new_thread (lwp_info *info) | |
944 | { | |
945 | /* Nop. */ | |
946 | } | |
947 | ||
2090129c SDJ |
948 | /* Callback to be used when calling fork_inferior, responsible for |
949 | actually initiating the tracing of the inferior. */ | |
950 | ||
951 | static void | |
952 | linux_ptrace_fun () | |
953 | { | |
954 | if (ptrace (PTRACE_TRACEME, 0, (PTRACE_TYPE_ARG3) 0, | |
955 | (PTRACE_TYPE_ARG4) 0) < 0) | |
50fa3001 | 956 | trace_start_error_with_name ("ptrace"); |
2090129c SDJ |
957 | |
958 | if (setpgid (0, 0) < 0) | |
959 | trace_start_error_with_name ("setpgid"); | |
960 | ||
961 | /* If GDBserver is connected to gdb via stdio, redirect the inferior's | |
962 | stdout to stderr so that inferior i/o doesn't corrupt the connection. | |
963 | Also, redirect stdin to /dev/null. */ | |
964 | if (remote_connection_is_stdio ()) | |
965 | { | |
966 | if (close (0) < 0) | |
967 | trace_start_error_with_name ("close"); | |
968 | if (open ("/dev/null", O_RDONLY) < 0) | |
969 | trace_start_error_with_name ("open"); | |
970 | if (dup2 (2, 1) < 0) | |
971 | trace_start_error_with_name ("dup2"); | |
972 | if (write (2, "stdin/stdout redirected\n", | |
973 | sizeof ("stdin/stdout redirected\n") - 1) < 0) | |
974 | { | |
975 | /* Errors ignored. */; | |
976 | } | |
977 | } | |
978 | } | |
979 | ||
da6d8c04 | 980 | /* Start an inferior process and returns its pid. |
2090129c SDJ |
981 | PROGRAM is the name of the program to be started, and PROGRAM_ARGS |
982 | are its arguments. */ | |
da6d8c04 | 983 | |
15295543 TBA |
984 | int |
985 | linux_process_target::create_inferior (const char *program, | |
986 | const std::vector<char *> &program_args) | |
da6d8c04 | 987 | { |
c12a5089 | 988 | client_state &cs = get_client_state (); |
a6dbe5df | 989 | struct lwp_info *new_lwp; |
da6d8c04 | 990 | int pid; |
95954743 | 991 | ptid_t ptid; |
03583c20 | 992 | |
41272101 TT |
993 | { |
994 | maybe_disable_address_space_randomization restore_personality | |
c12a5089 | 995 | (cs.disable_randomization); |
bea571eb | 996 | std::string str_program_args = construct_inferior_arguments (program_args); |
41272101 TT |
997 | |
998 | pid = fork_inferior (program, | |
999 | str_program_args.c_str (), | |
1000 | get_environ ()->envp (), linux_ptrace_fun, | |
1001 | NULL, NULL, NULL, NULL); | |
1002 | } | |
03583c20 | 1003 | |
421490af PA |
1004 | /* When spawning a new process, we can't open the mem file yet. We |
1005 | still have to nurse the process through the shell, and that execs | |
1006 | a couple times. The address space a /proc/PID/mem file is | |
1007 | accessing is destroyed on exec. */ | |
1008 | process_info *proc = add_linux_process_no_mem_file (pid, 0); | |
95954743 | 1009 | |
184ea2f7 | 1010 | ptid = ptid_t (pid, pid); |
95954743 | 1011 | new_lwp = add_lwp (ptid); |
a6dbe5df | 1012 | new_lwp->must_set_ptrace_flags = 1; |
611cb4a5 | 1013 | |
2090129c SDJ |
1014 | post_fork_inferior (pid, program); |
1015 | ||
421490af PA |
1016 | /* PROC is now past the shell running the program we want, so we can |
1017 | open the /proc/PID/mem file. */ | |
1018 | open_proc_mem_file (proc); | |
1019 | ||
a9fa9f7d | 1020 | return pid; |
da6d8c04 DJ |
1021 | } |
1022 | ||
ece66d65 JS |
1023 | /* Implement the post_create_inferior target_ops method. */ |
1024 | ||
6dee9afb TBA |
1025 | void |
1026 | linux_process_target::post_create_inferior () | |
ece66d65 JS |
1027 | { |
1028 | struct lwp_info *lwp = get_thread_lwp (current_thread); | |
1029 | ||
797bcff5 | 1030 | low_arch_setup (); |
ece66d65 JS |
1031 | |
1032 | if (lwp->must_set_ptrace_flags) | |
1033 | { | |
1034 | struct process_info *proc = current_process (); | |
1035 | int options = linux_low_ptrace_options (proc->attached); | |
1036 | ||
1037 | linux_enable_event_reporting (lwpid_of (current_thread), options); | |
1038 | lwp->must_set_ptrace_flags = 0; | |
1039 | } | |
1040 | } | |
1041 | ||
7ae1a6a6 | 1042 | int |
fd000fb3 | 1043 | linux_process_target::attach_lwp (ptid_t ptid) |
da6d8c04 | 1044 | { |
54a0b537 | 1045 | struct lwp_info *new_lwp; |
e38504b3 | 1046 | int lwpid = ptid.lwp (); |
611cb4a5 | 1047 | |
b8e1b30e | 1048 | if (ptrace (PTRACE_ATTACH, lwpid, (PTRACE_TYPE_ARG3) 0, (PTRACE_TYPE_ARG4) 0) |
56f7af9c | 1049 | != 0) |
7ae1a6a6 | 1050 | return errno; |
24a09b5f | 1051 | |
b3312d80 | 1052 | new_lwp = add_lwp (ptid); |
0d62e5e8 | 1053 | |
a6dbe5df PA |
1054 | /* We need to wait for SIGSTOP before being able to make the next |
1055 | ptrace call on this LWP. */ | |
1056 | new_lwp->must_set_ptrace_flags = 1; | |
1057 | ||
644cebc9 | 1058 | if (linux_proc_pid_is_stopped (lwpid)) |
c14d7ab2 | 1059 | { |
c058728c | 1060 | threads_debug_printf ("Attached to a stopped process"); |
c14d7ab2 PA |
1061 | |
1062 | /* The process is definitely stopped. It is in a job control | |
1063 | stop, unless the kernel predates the TASK_STOPPED / | |
1064 | TASK_TRACED distinction, in which case it might be in a | |
1065 | ptrace stop. Make sure it is in a ptrace stop; from there we | |
1066 | can kill it, signal it, et cetera. | |
1067 | ||
1068 | First make sure there is a pending SIGSTOP. Since we are | |
1069 | already attached, the process can not transition from stopped | |
1070 | to running without a PTRACE_CONT; so we know this signal will | |
1071 | go into the queue. The SIGSTOP generated by PTRACE_ATTACH is | |
1072 | probably already in the queue (unless this kernel is old | |
1073 | enough to use TASK_STOPPED for ptrace stops); but since | |
1074 | SIGSTOP is not an RT signal, it can only be queued once. */ | |
1075 | kill_lwp (lwpid, SIGSTOP); | |
1076 | ||
1077 | /* Finally, resume the stopped process. This will deliver the | |
1078 | SIGSTOP (or a higher priority signal, just like normal | |
1079 | PTRACE_ATTACH), which we'll catch later on. */ | |
b8e1b30e | 1080 | ptrace (PTRACE_CONT, lwpid, (PTRACE_TYPE_ARG3) 0, (PTRACE_TYPE_ARG4) 0); |
c14d7ab2 PA |
1081 | } |
1082 | ||
0d62e5e8 | 1083 | /* The next time we wait for this LWP we'll see a SIGSTOP as PTRACE_ATTACH |
0e21c1ec DE |
1084 | brings it to a halt. |
1085 | ||
1086 | There are several cases to consider here: | |
1087 | ||
1088 | 1) gdbserver has already attached to the process and is being notified | |
1b3f6016 | 1089 | of a new thread that is being created. |
d50171e4 PA |
1090 | In this case we should ignore that SIGSTOP and resume the |
1091 | process. This is handled below by setting stop_expected = 1, | |
8336d594 | 1092 | and the fact that add_thread sets last_resume_kind == |
d50171e4 | 1093 | resume_continue. |
0e21c1ec DE |
1094 | |
1095 | 2) This is the first thread (the process thread), and we're attaching | |
1b3f6016 PA |
1096 | to it via attach_inferior. |
1097 | In this case we want the process thread to stop. | |
d50171e4 PA |
1098 | This is handled by having linux_attach set last_resume_kind == |
1099 | resume_stop after we return. | |
e3deef73 LM |
1100 | |
1101 | If the pid we are attaching to is also the tgid, we attach to and | |
1102 | stop all the existing threads. Otherwise, we attach to pid and | |
1103 | ignore any other threads in the same group as this pid. | |
0e21c1ec DE |
1104 | |
1105 | 3) GDB is connecting to gdbserver and is requesting an enumeration of all | |
1b3f6016 PA |
1106 | existing threads. |
1107 | In this case we want the thread to stop. | |
1108 | FIXME: This case is currently not properly handled. | |
1109 | We should wait for the SIGSTOP but don't. Things work apparently | |
1110 | because enough time passes between when we ptrace (ATTACH) and when | |
1111 | gdb makes the next ptrace call on the thread. | |
0d62e5e8 DJ |
1112 | |
1113 | On the other hand, if we are currently trying to stop all threads, we | |
1114 | should treat the new thread as if we had sent it a SIGSTOP. This works | |
54a0b537 | 1115 | because we are guaranteed that the add_lwp call above added us to the |
0e21c1ec DE |
1116 | end of the list, and so the new thread has not yet reached |
1117 | wait_for_sigstop (but will). */ | |
d50171e4 | 1118 | new_lwp->stop_expected = 1; |
0d62e5e8 | 1119 | |
7ae1a6a6 | 1120 | return 0; |
95954743 PA |
1121 | } |
1122 | ||
8784d563 PA |
1123 | /* Callback for linux_proc_attach_tgid_threads. Attach to PTID if not |
1124 | already attached. Returns true if a new LWP is found, false | |
1125 | otherwise. */ | |
1126 | ||
1127 | static int | |
1128 | attach_proc_task_lwp_callback (ptid_t ptid) | |
1129 | { | |
1130 | /* Is this a new thread? */ | |
1131 | if (find_thread_ptid (ptid) == NULL) | |
1132 | { | |
e38504b3 | 1133 | int lwpid = ptid.lwp (); |
8784d563 PA |
1134 | int err; |
1135 | ||
c058728c | 1136 | threads_debug_printf ("Found new lwp %d", lwpid); |
8784d563 | 1137 | |
fd000fb3 | 1138 | err = the_linux_target->attach_lwp (ptid); |
8784d563 PA |
1139 | |
1140 | /* Be quiet if we simply raced with the thread exiting. EPERM | |
1141 | is returned if the thread's task still exists, and is marked | |
1142 | as exited or zombie, as well as other conditions, so in that | |
1143 | case, confirm the status in /proc/PID/status. */ | |
1144 | if (err == ESRCH | |
1145 | || (err == EPERM && linux_proc_pid_is_gone (lwpid))) | |
c058728c SM |
1146 | threads_debug_printf |
1147 | ("Cannot attach to lwp %d: thread is gone (%d: %s)", | |
1148 | lwpid, err, safe_strerror (err)); | |
8784d563 PA |
1149 | else if (err != 0) |
1150 | { | |
4d9b86e1 | 1151 | std::string reason |
50fa3001 | 1152 | = linux_ptrace_attach_fail_reason_string (ptid, err); |
4d9b86e1 SM |
1153 | |
1154 | warning (_("Cannot attach to lwp %d: %s"), lwpid, reason.c_str ()); | |
8784d563 PA |
1155 | } |
1156 | ||
1157 | return 1; | |
1158 | } | |
1159 | return 0; | |
1160 | } | |
1161 | ||
500c1d85 PA |
1162 | static void async_file_mark (void); |
1163 | ||
e3deef73 LM |
1164 | /* Attach to PID. If PID is the tgid, attach to it and all |
1165 | of its threads. */ | |
1166 | ||
ef03dad8 TBA |
1167 | int |
1168 | linux_process_target::attach (unsigned long pid) | |
0d62e5e8 | 1169 | { |
500c1d85 PA |
1170 | struct process_info *proc; |
1171 | struct thread_info *initial_thread; | |
184ea2f7 | 1172 | ptid_t ptid = ptid_t (pid, pid); |
7ae1a6a6 PA |
1173 | int err; |
1174 | ||
421490af PA |
1175 | /* Delay opening the /proc/PID/mem file until we've successfully |
1176 | attached. */ | |
1177 | proc = add_linux_process_no_mem_file (pid, 1); | |
df0da8a2 | 1178 | |
e3deef73 LM |
1179 | /* Attach to PID. We will check for other threads |
1180 | soon. */ | |
fd000fb3 | 1181 | err = attach_lwp (ptid); |
7ae1a6a6 | 1182 | if (err != 0) |
4d9b86e1 | 1183 | { |
f551c8ef | 1184 | this->remove_linux_process (proc); |
4d9b86e1 | 1185 | |
50fa3001 SDJ |
1186 | std::string reason = linux_ptrace_attach_fail_reason_string (ptid, err); |
1187 | error ("Cannot attach to process %ld: %s", pid, reason.c_str ()); | |
4d9b86e1 | 1188 | } |
7ae1a6a6 | 1189 | |
421490af PA |
1190 | open_proc_mem_file (proc); |
1191 | ||
500c1d85 PA |
1192 | /* Don't ignore the initial SIGSTOP if we just attached to this |
1193 | process. It will be collected by wait shortly. */ | |
184ea2f7 | 1194 | initial_thread = find_thread_ptid (ptid_t (pid, pid)); |
59487af3 | 1195 | gdb_assert (initial_thread != nullptr); |
500c1d85 | 1196 | initial_thread->last_resume_kind = resume_stop; |
0d62e5e8 | 1197 | |
8784d563 PA |
1198 | /* We must attach to every LWP. If /proc is mounted, use that to |
1199 | find them now. On the one hand, the inferior may be using raw | |
1200 | clone instead of using pthreads. On the other hand, even if it | |
1201 | is using pthreads, GDB may not be connected yet (thread_db needs | |
1202 | to do symbol lookups, through qSymbol). Also, thread_db walks | |
1203 | structures in the inferior's address space to find the list of | |
1204 | threads/LWPs, and those structures may well be corrupted. Note | |
1205 | that once thread_db is loaded, we'll still use it to list threads | |
1206 | and associate pthread info with each LWP. */ | |
1207 | linux_proc_attach_tgid_threads (pid, attach_proc_task_lwp_callback); | |
500c1d85 PA |
1208 | |
1209 | /* GDB will shortly read the xml target description for this | |
1210 | process, to figure out the process' architecture. But the target | |
1211 | description is only filled in when the first process/thread in | |
1212 | the thread group reports its initial PTRACE_ATTACH SIGSTOP. Do | |
1213 | that now, otherwise, if GDB is fast enough, it could read the | |
1214 | target description _before_ that initial stop. */ | |
1215 | if (non_stop) | |
1216 | { | |
1217 | struct lwp_info *lwp; | |
1218 | int wstat, lwpid; | |
f2907e49 | 1219 | ptid_t pid_ptid = ptid_t (pid); |
500c1d85 | 1220 | |
d16f3f6c | 1221 | lwpid = wait_for_event_filtered (pid_ptid, pid_ptid, &wstat, __WALL); |
500c1d85 PA |
1222 | gdb_assert (lwpid > 0); |
1223 | ||
f2907e49 | 1224 | lwp = find_lwp_pid (ptid_t (lwpid)); |
59487af3 | 1225 | gdb_assert (lwp != nullptr); |
500c1d85 PA |
1226 | |
1227 | if (!WIFSTOPPED (wstat) || WSTOPSIG (wstat) != SIGSTOP) | |
1228 | { | |
1229 | lwp->status_pending_p = 1; | |
1230 | lwp->status_pending = wstat; | |
1231 | } | |
1232 | ||
1233 | initial_thread->last_resume_kind = resume_continue; | |
1234 | ||
1235 | async_file_mark (); | |
1236 | ||
1237 | gdb_assert (proc->tdesc != NULL); | |
1238 | } | |
1239 | ||
95954743 PA |
1240 | return 0; |
1241 | } | |
1242 | ||
95954743 | 1243 | static int |
e4eb0dec | 1244 | last_thread_of_process_p (int pid) |
95954743 | 1245 | { |
e4eb0dec | 1246 | bool seen_one = false; |
95954743 | 1247 | |
da4ae14a | 1248 | thread_info *thread = find_thread (pid, [&] (thread_info *thr_arg) |
95954743 | 1249 | { |
e4eb0dec SM |
1250 | if (!seen_one) |
1251 | { | |
1252 | /* This is the first thread of this process we see. */ | |
1253 | seen_one = true; | |
1254 | return false; | |
1255 | } | |
1256 | else | |
1257 | { | |
1258 | /* This is the second thread of this process we see. */ | |
1259 | return true; | |
1260 | } | |
1261 | }); | |
da6d8c04 | 1262 | |
e4eb0dec | 1263 | return thread == NULL; |
95954743 PA |
1264 | } |
1265 | ||
da84f473 PA |
1266 | /* Kill LWP. */ |
1267 | ||
1268 | static void | |
1269 | linux_kill_one_lwp (struct lwp_info *lwp) | |
1270 | { | |
d86d4aaf DE |
1271 | struct thread_info *thr = get_lwp_thread (lwp); |
1272 | int pid = lwpid_of (thr); | |
da84f473 PA |
1273 | |
1274 | /* PTRACE_KILL is unreliable. After stepping into a signal handler, | |
1275 | there is no signal context, and ptrace(PTRACE_KILL) (or | |
1276 | ptrace(PTRACE_CONT, SIGKILL), pretty much the same) acts like | |
1277 | ptrace(CONT, pid, 0,0) and just resumes the tracee. A better | |
1278 | alternative is to kill with SIGKILL. We only need one SIGKILL | |
1279 | per process, not one for each thread. But since we still support | |
4a6ed09b PA |
1280 | support debugging programs using raw clone without CLONE_THREAD, |
1281 | we send one for each thread. For years, we used PTRACE_KILL | |
1282 | only, so we're being a bit paranoid about some old kernels where | |
1283 | PTRACE_KILL might work better (dubious if there are any such, but | |
1284 | that's why it's paranoia), so we try SIGKILL first, PTRACE_KILL | |
1285 | second, and so we're fine everywhere. */ | |
da84f473 PA |
1286 | |
1287 | errno = 0; | |
69ff6be5 | 1288 | kill_lwp (pid, SIGKILL); |
da84f473 | 1289 | if (debug_threads) |
ce9e3fe7 PA |
1290 | { |
1291 | int save_errno = errno; | |
1292 | ||
c058728c SM |
1293 | threads_debug_printf ("kill_lwp (SIGKILL) %s, 0, 0 (%s)", |
1294 | target_pid_to_str (ptid_of (thr)).c_str (), | |
1295 | save_errno ? safe_strerror (save_errno) : "OK"); | |
ce9e3fe7 | 1296 | } |
da84f473 PA |
1297 | |
1298 | errno = 0; | |
b8e1b30e | 1299 | ptrace (PTRACE_KILL, pid, (PTRACE_TYPE_ARG3) 0, (PTRACE_TYPE_ARG4) 0); |
da84f473 | 1300 | if (debug_threads) |
ce9e3fe7 PA |
1301 | { |
1302 | int save_errno = errno; | |
1303 | ||
c058728c SM |
1304 | threads_debug_printf ("PTRACE_KILL %s, 0, 0 (%s)", |
1305 | target_pid_to_str (ptid_of (thr)).c_str (), | |
1306 | save_errno ? safe_strerror (save_errno) : "OK"); | |
ce9e3fe7 | 1307 | } |
da84f473 PA |
1308 | } |
1309 | ||
e76126e8 PA |
1310 | /* Kill LWP and wait for it to die. */ |
1311 | ||
1312 | static void | |
1313 | kill_wait_lwp (struct lwp_info *lwp) | |
1314 | { | |
1315 | struct thread_info *thr = get_lwp_thread (lwp); | |
e99b03dc | 1316 | int pid = ptid_of (thr).pid (); |
e38504b3 | 1317 | int lwpid = ptid_of (thr).lwp (); |
e76126e8 PA |
1318 | int wstat; |
1319 | int res; | |
1320 | ||
c058728c | 1321 | threads_debug_printf ("killing lwp %d, for pid: %d", lwpid, pid); |
e76126e8 PA |
1322 | |
1323 | do | |
1324 | { | |
1325 | linux_kill_one_lwp (lwp); | |
1326 | ||
1327 | /* Make sure it died. Notes: | |
1328 | ||
1329 | - The loop is most likely unnecessary. | |
1330 | ||
d16f3f6c | 1331 | - We don't use wait_for_event as that could delete lwps |
e76126e8 PA |
1332 | while we're iterating over them. We're not interested in |
1333 | any pending status at this point, only in making sure all | |
1334 | wait status on the kernel side are collected until the | |
1335 | process is reaped. | |
1336 | ||
1337 | - We don't use __WALL here as the __WALL emulation relies on | |
1338 | SIGCHLD, and killing a stopped process doesn't generate | |
1339 | one, nor an exit status. | |
1340 | */ | |
1341 | res = my_waitpid (lwpid, &wstat, 0); | |
1342 | if (res == -1 && errno == ECHILD) | |
1343 | res = my_waitpid (lwpid, &wstat, __WCLONE); | |
1344 | } while (res > 0 && WIFSTOPPED (wstat)); | |
1345 | ||
586b02a9 PA |
1346 | /* Even if it was stopped, the child may have already disappeared. |
1347 | E.g., if it was killed by SIGKILL. */ | |
1348 | if (res < 0 && errno != ECHILD) | |
1349 | perror_with_name ("kill_wait_lwp"); | |
e76126e8 PA |
1350 | } |
1351 | ||
578290ec | 1352 | /* Callback for `for_each_thread'. Kills an lwp of a given process, |
da84f473 | 1353 | except the leader. */ |
95954743 | 1354 | |
578290ec SM |
1355 | static void |
1356 | kill_one_lwp_callback (thread_info *thread, int pid) | |
da6d8c04 | 1357 | { |
54a0b537 | 1358 | struct lwp_info *lwp = get_thread_lwp (thread); |
0d62e5e8 | 1359 | |
fd500816 DJ |
1360 | /* We avoid killing the first thread here, because of a Linux kernel (at |
1361 | least 2.6.0-test7 through 2.6.8-rc4) bug; if we kill the parent before | |
1362 | the children get a chance to be reaped, it will remain a zombie | |
1363 | forever. */ | |
95954743 | 1364 | |
d86d4aaf | 1365 | if (lwpid_of (thread) == pid) |
95954743 | 1366 | { |
c058728c SM |
1367 | threads_debug_printf ("is last of process %s", |
1368 | target_pid_to_str (thread->id).c_str ()); | |
578290ec | 1369 | return; |
95954743 | 1370 | } |
fd500816 | 1371 | |
e76126e8 | 1372 | kill_wait_lwp (lwp); |
da6d8c04 DJ |
1373 | } |
1374 | ||
c6885a57 TBA |
1375 | int |
1376 | linux_process_target::kill (process_info *process) | |
0d62e5e8 | 1377 | { |
a780ef4f | 1378 | int pid = process->pid; |
9d606399 | 1379 | |
f9e39928 PA |
1380 | /* If we're killing a running inferior, make sure it is stopped |
1381 | first, as PTRACE_KILL will not work otherwise. */ | |
7984d532 | 1382 | stop_all_lwps (0, NULL); |
f9e39928 | 1383 | |
578290ec SM |
1384 | for_each_thread (pid, [&] (thread_info *thread) |
1385 | { | |
1386 | kill_one_lwp_callback (thread, pid); | |
1387 | }); | |
fd500816 | 1388 | |
54a0b537 | 1389 | /* See the comment in linux_kill_one_lwp. We did not kill the first |
fd500816 | 1390 | thread in the list, so do so now. */ |
a780ef4f | 1391 | lwp_info *lwp = find_lwp_pid (ptid_t (pid)); |
bd99dc85 | 1392 | |
784867a5 | 1393 | if (lwp == NULL) |
c058728c | 1394 | threads_debug_printf ("cannot find lwp for pid: %d", pid); |
784867a5 | 1395 | else |
e76126e8 | 1396 | kill_wait_lwp (lwp); |
2d717e4f | 1397 | |
8adb37b9 | 1398 | mourn (process); |
f9e39928 PA |
1399 | |
1400 | /* Since we presently can only stop all lwps of all processes, we | |
1401 | need to unstop lwps of other processes. */ | |
7984d532 | 1402 | unstop_all_lwps (0, NULL); |
95954743 | 1403 | return 0; |
0d62e5e8 DJ |
1404 | } |
1405 | ||
9b224c5e PA |
1406 | /* Get pending signal of THREAD, for detaching purposes. This is the |
1407 | signal the thread last stopped for, which we need to deliver to the | |
1408 | thread when detaching, otherwise, it'd be suppressed/lost. */ | |
1409 | ||
1410 | static int | |
1411 | get_detach_signal (struct thread_info *thread) | |
1412 | { | |
c12a5089 | 1413 | client_state &cs = get_client_state (); |
a493e3e2 | 1414 | enum gdb_signal signo = GDB_SIGNAL_0; |
9b224c5e PA |
1415 | int status; |
1416 | struct lwp_info *lp = get_thread_lwp (thread); | |
1417 | ||
1418 | if (lp->status_pending_p) | |
1419 | status = lp->status_pending; | |
1420 | else | |
1421 | { | |
1422 | /* If the thread had been suspended by gdbserver, and it stopped | |
1423 | cleanly, then it'll have stopped with SIGSTOP. But we don't | |
1424 | want to deliver that SIGSTOP. */ | |
183be222 SM |
1425 | if (thread->last_status.kind () != TARGET_WAITKIND_STOPPED |
1426 | || thread->last_status.sig () == GDB_SIGNAL_0) | |
9b224c5e PA |
1427 | return 0; |
1428 | ||
1429 | /* Otherwise, we may need to deliver the signal we | |
1430 | intercepted. */ | |
1431 | status = lp->last_status; | |
1432 | } | |
1433 | ||
1434 | if (!WIFSTOPPED (status)) | |
1435 | { | |
c058728c SM |
1436 | threads_debug_printf ("lwp %s hasn't stopped: no pending signal", |
1437 | target_pid_to_str (ptid_of (thread)).c_str ()); | |
9b224c5e PA |
1438 | return 0; |
1439 | } | |
1440 | ||
1441 | /* Extended wait statuses aren't real SIGTRAPs. */ | |
89a5711c | 1442 | if (WSTOPSIG (status) == SIGTRAP && linux_is_extended_waitstatus (status)) |
9b224c5e | 1443 | { |
c058728c SM |
1444 | threads_debug_printf ("lwp %s had stopped with extended " |
1445 | "status: no pending signal", | |
1446 | target_pid_to_str (ptid_of (thread)).c_str ()); | |
9b224c5e PA |
1447 | return 0; |
1448 | } | |
1449 | ||
2ea28649 | 1450 | signo = gdb_signal_from_host (WSTOPSIG (status)); |
9b224c5e | 1451 | |
c12a5089 | 1452 | if (cs.program_signals_p && !cs.program_signals[signo]) |
9b224c5e | 1453 | { |
c058728c SM |
1454 | threads_debug_printf ("lwp %s had signal %s, but it is in nopass state", |
1455 | target_pid_to_str (ptid_of (thread)).c_str (), | |
1456 | gdb_signal_to_string (signo)); | |
9b224c5e PA |
1457 | return 0; |
1458 | } | |
c12a5089 | 1459 | else if (!cs.program_signals_p |
9b224c5e PA |
1460 | /* If we have no way to know which signals GDB does not |
1461 | want to have passed to the program, assume | |
1462 | SIGTRAP/SIGINT, which is GDB's default. */ | |
a493e3e2 | 1463 | && (signo == GDB_SIGNAL_TRAP || signo == GDB_SIGNAL_INT)) |
9b224c5e | 1464 | { |
c058728c SM |
1465 | threads_debug_printf ("lwp %s had signal %s, " |
1466 | "but we don't know if we should pass it. " | |
1467 | "Default to not.", | |
1468 | target_pid_to_str (ptid_of (thread)).c_str (), | |
1469 | gdb_signal_to_string (signo)); | |
9b224c5e PA |
1470 | return 0; |
1471 | } | |
1472 | else | |
1473 | { | |
c058728c SM |
1474 | threads_debug_printf ("lwp %s has pending signal %s: delivering it", |
1475 | target_pid_to_str (ptid_of (thread)).c_str (), | |
1476 | gdb_signal_to_string (signo)); | |
9b224c5e PA |
1477 | |
1478 | return WSTOPSIG (status); | |
1479 | } | |
1480 | } | |
1481 | ||
fd000fb3 TBA |
1482 | void |
1483 | linux_process_target::detach_one_lwp (lwp_info *lwp) | |
6ad8ae5c | 1484 | { |
ced2dffb | 1485 | struct thread_info *thread = get_lwp_thread (lwp); |
9b224c5e | 1486 | int sig; |
ced2dffb | 1487 | int lwpid; |
6ad8ae5c | 1488 | |
9b224c5e | 1489 | /* If there is a pending SIGSTOP, get rid of it. */ |
54a0b537 | 1490 | if (lwp->stop_expected) |
ae13219e | 1491 | { |
c058728c SM |
1492 | threads_debug_printf ("Sending SIGCONT to %s", |
1493 | target_pid_to_str (ptid_of (thread)).c_str ()); | |
9b224c5e | 1494 | |
d86d4aaf | 1495 | kill_lwp (lwpid_of (thread), SIGCONT); |
54a0b537 | 1496 | lwp->stop_expected = 0; |
ae13219e DJ |
1497 | } |
1498 | ||
9b224c5e PA |
1499 | /* Pass on any pending signal for this thread. */ |
1500 | sig = get_detach_signal (thread); | |
1501 | ||
ced2dffb PA |
1502 | /* Preparing to resume may try to write registers, and fail if the |
1503 | lwp is zombie. If that happens, ignore the error. We'll handle | |
1504 | it below, when detach fails with ESRCH. */ | |
a70b8144 | 1505 | try |
ced2dffb PA |
1506 | { |
1507 | /* Flush any pending changes to the process's registers. */ | |
1508 | regcache_invalidate_thread (thread); | |
1509 | ||
1510 | /* Finally, let it resume. */ | |
d7599cc0 | 1511 | low_prepare_to_resume (lwp); |
ced2dffb | 1512 | } |
230d2906 | 1513 | catch (const gdb_exception_error &ex) |
ced2dffb PA |
1514 | { |
1515 | if (!check_ptrace_stopped_lwp_gone (lwp)) | |
eedc3f4f | 1516 | throw; |
ced2dffb | 1517 | } |
ced2dffb PA |
1518 | |
1519 | lwpid = lwpid_of (thread); | |
1520 | if (ptrace (PTRACE_DETACH, lwpid, (PTRACE_TYPE_ARG3) 0, | |
b8e1b30e | 1521 | (PTRACE_TYPE_ARG4) (long) sig) < 0) |
ced2dffb PA |
1522 | { |
1523 | int save_errno = errno; | |
1524 | ||
1525 | /* We know the thread exists, so ESRCH must mean the lwp is | |
1526 | zombie. This can happen if one of the already-detached | |
1527 | threads exits the whole thread group. In that case we're | |
1528 | still attached, and must reap the lwp. */ | |
1529 | if (save_errno == ESRCH) | |
1530 | { | |
1531 | int ret, status; | |
1532 | ||
1533 | ret = my_waitpid (lwpid, &status, __WALL); | |
1534 | if (ret == -1) | |
1535 | { | |
1536 | warning (_("Couldn't reap LWP %d while detaching: %s"), | |
6d91ce9a | 1537 | lwpid, safe_strerror (errno)); |
ced2dffb PA |
1538 | } |
1539 | else if (!WIFEXITED (status) && !WIFSIGNALED (status)) | |
1540 | { | |
1541 | warning (_("Reaping LWP %d while detaching " | |
1542 | "returned unexpected status 0x%x"), | |
1543 | lwpid, status); | |
1544 | } | |
1545 | } | |
1546 | else | |
1547 | { | |
1548 | error (_("Can't detach %s: %s"), | |
61d7f128 | 1549 | target_pid_to_str (ptid_of (thread)).c_str (), |
6d91ce9a | 1550 | safe_strerror (save_errno)); |
ced2dffb PA |
1551 | } |
1552 | } | |
c058728c SM |
1553 | else |
1554 | threads_debug_printf ("PTRACE_DETACH (%s, %s, 0) (OK)", | |
1555 | target_pid_to_str (ptid_of (thread)).c_str (), | |
1556 | strsignal (sig)); | |
bd99dc85 PA |
1557 | |
1558 | delete_lwp (lwp); | |
ced2dffb PA |
1559 | } |
1560 | ||
9061c9cf TBA |
1561 | int |
1562 | linux_process_target::detach (process_info *process) | |
95954743 | 1563 | { |
ced2dffb | 1564 | struct lwp_info *main_lwp; |
95954743 | 1565 | |
863d01bd PA |
1566 | /* As there's a step over already in progress, let it finish first, |
1567 | otherwise nesting a stabilize_threads operation on top gets real | |
1568 | messy. */ | |
1569 | complete_ongoing_step_over (); | |
1570 | ||
f9e39928 | 1571 | /* Stop all threads before detaching. First, ptrace requires that |
30baf67b | 1572 | the thread is stopped to successfully detach. Second, thread_db |
f9e39928 PA |
1573 | may need to uninstall thread event breakpoints from memory, which |
1574 | only works with a stopped process anyway. */ | |
7984d532 | 1575 | stop_all_lwps (0, NULL); |
f9e39928 | 1576 | |
ca5c370d | 1577 | #ifdef USE_THREAD_DB |
8336d594 | 1578 | thread_db_detach (process); |
ca5c370d PA |
1579 | #endif |
1580 | ||
fa593d66 | 1581 | /* Stabilize threads (move out of jump pads). */ |
5c9eb2f2 | 1582 | target_stabilize_threads (); |
fa593d66 | 1583 | |
ced2dffb PA |
1584 | /* Detach from the clone lwps first. If the thread group exits just |
1585 | while we're detaching, we must reap the clone lwps before we're | |
1586 | able to reap the leader. */ | |
fd000fb3 TBA |
1587 | for_each_thread (process->pid, [this] (thread_info *thread) |
1588 | { | |
1589 | /* We don't actually detach from the thread group leader just yet. | |
1590 | If the thread group exits, we must reap the zombie clone lwps | |
1591 | before we're able to reap the leader. */ | |
1592 | if (thread->id.pid () == thread->id.lwp ()) | |
1593 | return; | |
1594 | ||
1595 | lwp_info *lwp = get_thread_lwp (thread); | |
1596 | detach_one_lwp (lwp); | |
1597 | }); | |
ced2dffb | 1598 | |
ef2ddb33 | 1599 | main_lwp = find_lwp_pid (ptid_t (process->pid)); |
59487af3 | 1600 | gdb_assert (main_lwp != nullptr); |
fd000fb3 | 1601 | detach_one_lwp (main_lwp); |
8336d594 | 1602 | |
8adb37b9 | 1603 | mourn (process); |
f9e39928 PA |
1604 | |
1605 | /* Since we presently can only stop all lwps of all processes, we | |
1606 | need to unstop lwps of other processes. */ | |
7984d532 | 1607 | unstop_all_lwps (0, NULL); |
f9e39928 PA |
1608 | return 0; |
1609 | } | |
1610 | ||
1611 | /* Remove all LWPs that belong to process PROC from the lwp list. */ | |
1612 | ||
8adb37b9 TBA |
1613 | void |
1614 | linux_process_target::mourn (process_info *process) | |
8336d594 | 1615 | { |
8336d594 PA |
1616 | #ifdef USE_THREAD_DB |
1617 | thread_db_mourn (process); | |
1618 | #endif | |
1619 | ||
fd000fb3 | 1620 | for_each_thread (process->pid, [this] (thread_info *thread) |
6b2a85da SM |
1621 | { |
1622 | delete_lwp (get_thread_lwp (thread)); | |
1623 | }); | |
f9e39928 | 1624 | |
f551c8ef | 1625 | this->remove_linux_process (process); |
8336d594 PA |
1626 | } |
1627 | ||
95a49a39 TBA |
1628 | void |
1629 | linux_process_target::join (int pid) | |
444d6139 | 1630 | { |
444d6139 PA |
1631 | int status, ret; |
1632 | ||
1633 | do { | |
d105de22 | 1634 | ret = my_waitpid (pid, &status, 0); |
444d6139 PA |
1635 | if (WIFEXITED (status) || WIFSIGNALED (status)) |
1636 | break; | |
1637 | } while (ret != -1 || errno != ECHILD); | |
1638 | } | |
1639 | ||
13d3d99b TBA |
1640 | /* Return true if the given thread is still alive. */ |
1641 | ||
1642 | bool | |
1643 | linux_process_target::thread_alive (ptid_t ptid) | |
0d62e5e8 | 1644 | { |
95954743 PA |
1645 | struct lwp_info *lwp = find_lwp_pid (ptid); |
1646 | ||
1647 | /* We assume we always know if a thread exits. If a whole process | |
1648 | exited but we still haven't been able to report it to GDB, we'll | |
1649 | hold on to the last lwp of the dead process. */ | |
1650 | if (lwp != NULL) | |
00db26fa | 1651 | return !lwp_is_marked_dead (lwp); |
0d62e5e8 DJ |
1652 | else |
1653 | return 0; | |
1654 | } | |
1655 | ||
df95181f TBA |
1656 | bool |
1657 | linux_process_target::thread_still_has_status_pending (thread_info *thread) | |
582511be PA |
1658 | { |
1659 | struct lwp_info *lp = get_thread_lwp (thread); | |
1660 | ||
1661 | if (!lp->status_pending_p) | |
1662 | return 0; | |
1663 | ||
582511be | 1664 | if (thread->last_resume_kind != resume_stop |
15c66dd6 PA |
1665 | && (lp->stop_reason == TARGET_STOPPED_BY_SW_BREAKPOINT |
1666 | || lp->stop_reason == TARGET_STOPPED_BY_HW_BREAKPOINT)) | |
582511be | 1667 | { |
582511be PA |
1668 | CORE_ADDR pc; |
1669 | int discard = 0; | |
1670 | ||
1671 | gdb_assert (lp->last_status != 0); | |
1672 | ||
1673 | pc = get_pc (lp); | |
1674 | ||
24583e45 TBA |
1675 | scoped_restore_current_thread restore_thread; |
1676 | switch_to_thread (thread); | |
582511be PA |
1677 | |
1678 | if (pc != lp->stop_pc) | |
1679 | { | |
c058728c SM |
1680 | threads_debug_printf ("PC of %ld changed", |
1681 | lwpid_of (thread)); | |
582511be PA |
1682 | discard = 1; |
1683 | } | |
3e572f71 PA |
1684 | |
1685 | #if !USE_SIGTRAP_SIGINFO | |
15c66dd6 | 1686 | else if (lp->stop_reason == TARGET_STOPPED_BY_SW_BREAKPOINT |
d7146cda | 1687 | && !low_breakpoint_at (pc)) |
582511be | 1688 | { |
c058728c SM |
1689 | threads_debug_printf ("previous SW breakpoint of %ld gone", |
1690 | lwpid_of (thread)); | |
582511be PA |
1691 | discard = 1; |
1692 | } | |
15c66dd6 | 1693 | else if (lp->stop_reason == TARGET_STOPPED_BY_HW_BREAKPOINT |
582511be PA |
1694 | && !hardware_breakpoint_inserted_here (pc)) |
1695 | { | |
c058728c SM |
1696 | threads_debug_printf ("previous HW breakpoint of %ld gone", |
1697 | lwpid_of (thread)); | |
582511be PA |
1698 | discard = 1; |
1699 | } | |
3e572f71 | 1700 | #endif |
582511be | 1701 | |
582511be PA |
1702 | if (discard) |
1703 | { | |
c058728c | 1704 | threads_debug_printf ("discarding pending breakpoint status"); |
582511be PA |
1705 | lp->status_pending_p = 0; |
1706 | return 0; | |
1707 | } | |
1708 | } | |
1709 | ||
1710 | return 1; | |
1711 | } | |
1712 | ||
a681f9c9 PA |
1713 | /* Returns true if LWP is resumed from the client's perspective. */ |
1714 | ||
1715 | static int | |
1716 | lwp_resumed (struct lwp_info *lwp) | |
1717 | { | |
1718 | struct thread_info *thread = get_lwp_thread (lwp); | |
1719 | ||
1720 | if (thread->last_resume_kind != resume_stop) | |
1721 | return 1; | |
1722 | ||
1723 | /* Did gdb send us a `vCont;t', but we haven't reported the | |
1724 | corresponding stop to gdb yet? If so, the thread is still | |
1725 | resumed/running from gdb's perspective. */ | |
1726 | if (thread->last_resume_kind == resume_stop | |
183be222 | 1727 | && thread->last_status.kind () == TARGET_WAITKIND_IGNORE) |
a681f9c9 PA |
1728 | return 1; |
1729 | ||
1730 | return 0; | |
1731 | } | |
1732 | ||
df95181f TBA |
1733 | bool |
1734 | linux_process_target::status_pending_p_callback (thread_info *thread, | |
1735 | ptid_t ptid) | |
0d62e5e8 | 1736 | { |
582511be | 1737 | struct lwp_info *lp = get_thread_lwp (thread); |
95954743 PA |
1738 | |
1739 | /* Check if we're only interested in events from a specific process | |
afa8d396 | 1740 | or a specific LWP. */ |
83e1b6c1 | 1741 | if (!thread->id.matches (ptid)) |
95954743 | 1742 | return 0; |
0d62e5e8 | 1743 | |
a681f9c9 PA |
1744 | if (!lwp_resumed (lp)) |
1745 | return 0; | |
1746 | ||
582511be | 1747 | if (lp->status_pending_p |
df95181f | 1748 | && !thread_still_has_status_pending (thread)) |
582511be | 1749 | { |
df95181f | 1750 | resume_one_lwp (lp, lp->stepping, GDB_SIGNAL_0, NULL); |
582511be PA |
1751 | return 0; |
1752 | } | |
0d62e5e8 | 1753 | |
582511be | 1754 | return lp->status_pending_p; |
0d62e5e8 DJ |
1755 | } |
1756 | ||
95954743 PA |
1757 | struct lwp_info * |
1758 | find_lwp_pid (ptid_t ptid) | |
1759 | { | |
d4895ba2 SM |
1760 | long lwp = ptid.lwp () != 0 ? ptid.lwp () : ptid.pid (); |
1761 | thread_info *thread = find_thread ([lwp] (thread_info *thr_arg) | |
454296a2 | 1762 | { |
da4ae14a | 1763 | return thr_arg->id.lwp () == lwp; |
454296a2 | 1764 | }); |
d86d4aaf DE |
1765 | |
1766 | if (thread == NULL) | |
1767 | return NULL; | |
1768 | ||
9c80ecd6 | 1769 | return get_thread_lwp (thread); |
95954743 PA |
1770 | } |
1771 | ||
fa96cb38 | 1772 | /* Return the number of known LWPs in the tgid given by PID. */ |
0d62e5e8 | 1773 | |
fa96cb38 PA |
1774 | static int |
1775 | num_lwps (int pid) | |
1776 | { | |
fa96cb38 | 1777 | int count = 0; |
0d62e5e8 | 1778 | |
4d3bb80e SM |
1779 | for_each_thread (pid, [&] (thread_info *thread) |
1780 | { | |
9c80ecd6 | 1781 | count++; |
4d3bb80e | 1782 | }); |
3aee8918 | 1783 | |
fa96cb38 PA |
1784 | return count; |
1785 | } | |
d61ddec4 | 1786 | |
6d4ee8c6 GB |
1787 | /* See nat/linux-nat.h. */ |
1788 | ||
1789 | struct lwp_info * | |
1790 | iterate_over_lwps (ptid_t filter, | |
d3a70e03 | 1791 | gdb::function_view<iterate_over_lwps_ftype> callback) |
6d4ee8c6 | 1792 | { |
da4ae14a | 1793 | thread_info *thread = find_thread (filter, [&] (thread_info *thr_arg) |
6d1e5673 | 1794 | { |
da4ae14a | 1795 | lwp_info *lwp = get_thread_lwp (thr_arg); |
6d1e5673 | 1796 | |
d3a70e03 | 1797 | return callback (lwp); |
6d1e5673 | 1798 | }); |
6d4ee8c6 | 1799 | |
9c80ecd6 | 1800 | if (thread == NULL) |
6d4ee8c6 GB |
1801 | return NULL; |
1802 | ||
9c80ecd6 | 1803 | return get_thread_lwp (thread); |
6d4ee8c6 GB |
1804 | } |
1805 | ||
fd000fb3 TBA |
1806 | void |
1807 | linux_process_target::check_zombie_leaders () | |
fa96cb38 | 1808 | { |
aa40a989 PA |
1809 | for_each_process ([this] (process_info *proc) |
1810 | { | |
1811 | pid_t leader_pid = pid_of (proc); | |
1812 | lwp_info *leader_lp = find_lwp_pid (ptid_t (leader_pid)); | |
1813 | ||
1814 | threads_debug_printf ("leader_pid=%d, leader_lp!=NULL=%d, " | |
1815 | "num_lwps=%d, zombie=%d", | |
1816 | leader_pid, leader_lp!= NULL, num_lwps (leader_pid), | |
1817 | linux_proc_pid_is_zombie (leader_pid)); | |
1818 | ||
1819 | if (leader_lp != NULL && !leader_lp->stopped | |
1820 | /* Check if there are other threads in the group, as we may | |
8a841a35 PA |
1821 | have raced with the inferior simply exiting. Note this |
1822 | isn't a watertight check. If the inferior is | |
1823 | multi-threaded and is exiting, it may be we see the | |
1824 | leader as zombie before we reap all the non-leader | |
1825 | threads. See comments below. */ | |
aa40a989 PA |
1826 | && !last_thread_of_process_p (leader_pid) |
1827 | && linux_proc_pid_is_zombie (leader_pid)) | |
1828 | { | |
8a841a35 PA |
1829 | /* A zombie leader in a multi-threaded program can mean one |
1830 | of three things: | |
1831 | ||
1832 | #1 - Only the leader exited, not the whole program, e.g., | |
1833 | with pthread_exit. Since we can't reap the leader's exit | |
1834 | status until all other threads are gone and reaped too, | |
1835 | we want to delete the zombie leader right away, as it | |
1836 | can't be debugged, we can't read its registers, etc. | |
1837 | This is the main reason we check for zombie leaders | |
1838 | disappearing. | |
1839 | ||
1840 | #2 - The whole thread-group/process exited (a group exit, | |
1841 | via e.g. exit(3), and there is (or will be shortly) an | |
1842 | exit reported for each thread in the process, and then | |
1843 | finally an exit for the leader once the non-leaders are | |
1844 | reaped. | |
1845 | ||
1846 | #3 - There are 3 or more threads in the group, and a | |
1847 | thread other than the leader exec'd. See comments on | |
1848 | exec events at the top of the file. | |
1849 | ||
1850 | Ideally we would never delete the leader for case #2. | |
1851 | Instead, we want to collect the exit status of each | |
1852 | non-leader thread, and then finally collect the exit | |
1853 | status of the leader as normal and use its exit code as | |
1854 | whole-process exit code. Unfortunately, there's no | |
1855 | race-free way to distinguish cases #1 and #2. We can't | |
1856 | assume the exit events for the non-leaders threads are | |
1857 | already pending in the kernel, nor can we assume the | |
1858 | non-leader threads are in zombie state already. Between | |
1859 | the leader becoming zombie and the non-leaders exiting | |
1860 | and becoming zombie themselves, there's a small time | |
1861 | window, so such a check would be racy. Temporarily | |
1862 | pausing all threads and checking to see if all threads | |
1863 | exit or not before re-resuming them would work in the | |
1864 | case that all threads are running right now, but it | |
1865 | wouldn't work if some thread is currently already | |
1866 | ptrace-stopped, e.g., due to scheduler-locking. | |
1867 | ||
1868 | So what we do is we delete the leader anyhow, and then | |
1869 | later on when we see its exit status, we re-add it back. | |
1870 | We also make sure that we only report a whole-process | |
1871 | exit when we see the leader exiting, as opposed to when | |
1872 | the last LWP in the LWP list exits, which can be a | |
1873 | non-leader if we deleted the leader here. */ | |
aa40a989 | 1874 | threads_debug_printf ("Thread group leader %d zombie " |
8a841a35 PA |
1875 | "(it exited, or another thread execd), " |
1876 | "deleting it.", | |
aa40a989 | 1877 | leader_pid); |
aa40a989 PA |
1878 | delete_lwp (leader_lp); |
1879 | } | |
9179355e | 1880 | }); |
fa96cb38 | 1881 | } |
c3adc08c | 1882 | |
a1385b7b SM |
1883 | /* Callback for `find_thread'. Returns the first LWP that is not |
1884 | stopped. */ | |
d50171e4 | 1885 | |
a1385b7b SM |
1886 | static bool |
1887 | not_stopped_callback (thread_info *thread, ptid_t filter) | |
fa96cb38 | 1888 | { |
a1385b7b SM |
1889 | if (!thread->id.matches (filter)) |
1890 | return false; | |
47c0c975 | 1891 | |
a1385b7b | 1892 | lwp_info *lwp = get_thread_lwp (thread); |
fa96cb38 | 1893 | |
a1385b7b | 1894 | return !lwp->stopped; |
0d62e5e8 | 1895 | } |
611cb4a5 | 1896 | |
863d01bd PA |
1897 | /* Increment LWP's suspend count. */ |
1898 | ||
1899 | static void | |
1900 | lwp_suspended_inc (struct lwp_info *lwp) | |
1901 | { | |
1902 | lwp->suspended++; | |
1903 | ||
c058728c SM |
1904 | if (lwp->suspended > 4) |
1905 | threads_debug_printf | |
1906 | ("LWP %ld has a suspiciously high suspend count, suspended=%d", | |
1907 | lwpid_of (get_lwp_thread (lwp)), lwp->suspended); | |
863d01bd PA |
1908 | } |
1909 | ||
1910 | /* Decrement LWP's suspend count. */ | |
1911 | ||
1912 | static void | |
1913 | lwp_suspended_decr (struct lwp_info *lwp) | |
1914 | { | |
1915 | lwp->suspended--; | |
1916 | ||
1917 | if (lwp->suspended < 0) | |
1918 | { | |
1919 | struct thread_info *thread = get_lwp_thread (lwp); | |
1920 | ||
f34652de | 1921 | internal_error ("unsuspend LWP %ld, suspended=%d\n", lwpid_of (thread), |
863d01bd PA |
1922 | lwp->suspended); |
1923 | } | |
1924 | } | |
1925 | ||
219f2f23 PA |
1926 | /* This function should only be called if the LWP got a SIGTRAP. |
1927 | ||
1928 | Handle any tracepoint steps or hits. Return true if a tracepoint | |
1929 | event was handled, 0 otherwise. */ | |
1930 | ||
1931 | static int | |
1932 | handle_tracepoints (struct lwp_info *lwp) | |
1933 | { | |
1934 | struct thread_info *tinfo = get_lwp_thread (lwp); | |
1935 | int tpoint_related_event = 0; | |
1936 | ||
582511be PA |
1937 | gdb_assert (lwp->suspended == 0); |
1938 | ||
7984d532 PA |
1939 | /* If this tracepoint hit causes a tracing stop, we'll immediately |
1940 | uninsert tracepoints. To do this, we temporarily pause all | |
1941 | threads, unpatch away, and then unpause threads. We need to make | |
1942 | sure the unpausing doesn't resume LWP too. */ | |
863d01bd | 1943 | lwp_suspended_inc (lwp); |
7984d532 | 1944 | |
219f2f23 PA |
1945 | /* And we need to be sure that any all-threads-stopping doesn't try |
1946 | to move threads out of the jump pads, as it could deadlock the | |
1947 | inferior (LWP could be in the jump pad, maybe even holding the | |
1948 | lock.) */ | |
1949 | ||
1950 | /* Do any necessary step collect actions. */ | |
1951 | tpoint_related_event |= tracepoint_finished_step (tinfo, lwp->stop_pc); | |
1952 | ||
fa593d66 PA |
1953 | tpoint_related_event |= handle_tracepoint_bkpts (tinfo, lwp->stop_pc); |
1954 | ||
219f2f23 PA |
1955 | /* See if we just hit a tracepoint and do its main collect |
1956 | actions. */ | |
1957 | tpoint_related_event |= tracepoint_was_hit (tinfo, lwp->stop_pc); | |
1958 | ||
863d01bd | 1959 | lwp_suspended_decr (lwp); |
7984d532 PA |
1960 | |
1961 | gdb_assert (lwp->suspended == 0); | |
229d26fc SM |
1962 | gdb_assert (!stabilizing_threads |
1963 | || (lwp->collecting_fast_tracepoint | |
1964 | != fast_tpoint_collect_result::not_collecting)); | |
7984d532 | 1965 | |
219f2f23 PA |
1966 | if (tpoint_related_event) |
1967 | { | |
c058728c | 1968 | threads_debug_printf ("got a tracepoint event"); |
219f2f23 PA |
1969 | return 1; |
1970 | } | |
1971 | ||
1972 | return 0; | |
1973 | } | |
1974 | ||
13e567af TBA |
1975 | fast_tpoint_collect_result |
1976 | linux_process_target::linux_fast_tracepoint_collecting | |
1977 | (lwp_info *lwp, fast_tpoint_collect_status *status) | |
fa593d66 PA |
1978 | { |
1979 | CORE_ADDR thread_area; | |
d86d4aaf | 1980 | struct thread_info *thread = get_lwp_thread (lwp); |
fa593d66 | 1981 | |
fa593d66 PA |
1982 | /* Get the thread area address. This is used to recognize which |
1983 | thread is which when tracing with the in-process agent library. | |
1984 | We don't read anything from the address, and treat it as opaque; | |
1985 | it's the address itself that we assume is unique per-thread. */ | |
13e567af | 1986 | if (low_get_thread_area (lwpid_of (thread), &thread_area) == -1) |
229d26fc | 1987 | return fast_tpoint_collect_result::not_collecting; |
fa593d66 PA |
1988 | |
1989 | return fast_tracepoint_collecting (thread_area, lwp->stop_pc, status); | |
1990 | } | |
1991 | ||
13e567af TBA |
1992 | int |
1993 | linux_process_target::low_get_thread_area (int lwpid, CORE_ADDR *addrp) | |
1994 | { | |
1995 | return -1; | |
1996 | } | |
1997 | ||
d16f3f6c TBA |
1998 | bool |
1999 | linux_process_target::maybe_move_out_of_jump_pad (lwp_info *lwp, int *wstat) | |
fa593d66 | 2000 | { |
24583e45 TBA |
2001 | scoped_restore_current_thread restore_thread; |
2002 | switch_to_thread (get_lwp_thread (lwp)); | |
fa593d66 PA |
2003 | |
2004 | if ((wstat == NULL | |
2005 | || (WIFSTOPPED (*wstat) && WSTOPSIG (*wstat) != SIGTRAP)) | |
2006 | && supports_fast_tracepoints () | |
58b4daa5 | 2007 | && agent_loaded_p ()) |
fa593d66 PA |
2008 | { |
2009 | struct fast_tpoint_collect_status status; | |
fa593d66 | 2010 | |
c058728c SM |
2011 | threads_debug_printf |
2012 | ("Checking whether LWP %ld needs to move out of the jump pad.", | |
2013 | lwpid_of (current_thread)); | |
fa593d66 | 2014 | |
229d26fc SM |
2015 | fast_tpoint_collect_result r |
2016 | = linux_fast_tracepoint_collecting (lwp, &status); | |
fa593d66 PA |
2017 | |
2018 | if (wstat == NULL | |
2019 | || (WSTOPSIG (*wstat) != SIGILL | |
2020 | && WSTOPSIG (*wstat) != SIGFPE | |
2021 | && WSTOPSIG (*wstat) != SIGSEGV | |
2022 | && WSTOPSIG (*wstat) != SIGBUS)) | |
2023 | { | |
2024 | lwp->collecting_fast_tracepoint = r; | |
2025 | ||
229d26fc | 2026 | if (r != fast_tpoint_collect_result::not_collecting) |
fa593d66 | 2027 | { |
229d26fc SM |
2028 | if (r == fast_tpoint_collect_result::before_insn |
2029 | && lwp->exit_jump_pad_bkpt == NULL) | |
fa593d66 PA |
2030 | { |
2031 | /* Haven't executed the original instruction yet. | |
2032 | Set breakpoint there, and wait till it's hit, | |
2033 | then single-step until exiting the jump pad. */ | |
2034 | lwp->exit_jump_pad_bkpt | |
2035 | = set_breakpoint_at (status.adjusted_insn_addr, NULL); | |
2036 | } | |
2037 | ||
c058728c SM |
2038 | threads_debug_printf |
2039 | ("Checking whether LWP %ld needs to move out of the jump pad..." | |
2040 | " it does", lwpid_of (current_thread)); | |
fa593d66 | 2041 | |
d16f3f6c | 2042 | return true; |
fa593d66 PA |
2043 | } |
2044 | } | |
2045 | else | |
2046 | { | |
2047 | /* If we get a synchronous signal while collecting, *and* | |
2048 | while executing the (relocated) original instruction, | |
2049 | reset the PC to point at the tpoint address, before | |
2050 | reporting to GDB. Otherwise, it's an IPA lib bug: just | |
2051 | report the signal to GDB, and pray for the best. */ | |
2052 | ||
229d26fc SM |
2053 | lwp->collecting_fast_tracepoint |
2054 | = fast_tpoint_collect_result::not_collecting; | |
fa593d66 | 2055 | |
229d26fc | 2056 | if (r != fast_tpoint_collect_result::not_collecting |
fa593d66 PA |
2057 | && (status.adjusted_insn_addr <= lwp->stop_pc |
2058 | && lwp->stop_pc < status.adjusted_insn_addr_end)) | |
2059 | { | |
2060 | siginfo_t info; | |
2061 | struct regcache *regcache; | |
2062 | ||
2063 | /* The si_addr on a few signals references the address | |
2064 | of the faulting instruction. Adjust that as | |
2065 | well. */ | |
2066 | if ((WSTOPSIG (*wstat) == SIGILL | |
2067 | || WSTOPSIG (*wstat) == SIGFPE | |
2068 | || WSTOPSIG (*wstat) == SIGBUS | |
2069 | || WSTOPSIG (*wstat) == SIGSEGV) | |
0bfdf32f | 2070 | && ptrace (PTRACE_GETSIGINFO, lwpid_of (current_thread), |
b8e1b30e | 2071 | (PTRACE_TYPE_ARG3) 0, &info) == 0 |
fa593d66 PA |
2072 | /* Final check just to make sure we don't clobber |
2073 | the siginfo of non-kernel-sent signals. */ | |
2074 | && (uintptr_t) info.si_addr == lwp->stop_pc) | |
2075 | { | |
2076 | info.si_addr = (void *) (uintptr_t) status.tpoint_addr; | |
0bfdf32f | 2077 | ptrace (PTRACE_SETSIGINFO, lwpid_of (current_thread), |
b8e1b30e | 2078 | (PTRACE_TYPE_ARG3) 0, &info); |
fa593d66 PA |
2079 | } |
2080 | ||
0bfdf32f | 2081 | regcache = get_thread_regcache (current_thread, 1); |
bf9ae9d8 | 2082 | low_set_pc (regcache, status.tpoint_addr); |
fa593d66 PA |
2083 | lwp->stop_pc = status.tpoint_addr; |
2084 | ||
2085 | /* Cancel any fast tracepoint lock this thread was | |
2086 | holding. */ | |
2087 | force_unlock_trace_buffer (); | |
2088 | } | |
2089 | ||
2090 | if (lwp->exit_jump_pad_bkpt != NULL) | |
2091 | { | |
c058728c SM |
2092 | threads_debug_printf |
2093 | ("Cancelling fast exit-jump-pad: removing bkpt." | |
2094 | "stopping all threads momentarily."); | |
fa593d66 PA |
2095 | |
2096 | stop_all_lwps (1, lwp); | |
fa593d66 PA |
2097 | |
2098 | delete_breakpoint (lwp->exit_jump_pad_bkpt); | |
2099 | lwp->exit_jump_pad_bkpt = NULL; | |
2100 | ||
2101 | unstop_all_lwps (1, lwp); | |
2102 | ||
2103 | gdb_assert (lwp->suspended >= 0); | |
2104 | } | |
2105 | } | |
2106 | } | |
2107 | ||
c058728c SM |
2108 | threads_debug_printf |
2109 | ("Checking whether LWP %ld needs to move out of the jump pad... no", | |
2110 | lwpid_of (current_thread)); | |
0cccb683 | 2111 | |
d16f3f6c | 2112 | return false; |
fa593d66 PA |
2113 | } |
2114 | ||
2115 | /* Enqueue one signal in the "signals to report later when out of the | |
2116 | jump pad" list. */ | |
2117 | ||
2118 | static void | |
2119 | enqueue_one_deferred_signal (struct lwp_info *lwp, int *wstat) | |
2120 | { | |
d86d4aaf | 2121 | struct thread_info *thread = get_lwp_thread (lwp); |
fa593d66 | 2122 | |
c058728c SM |
2123 | threads_debug_printf ("Deferring signal %d for LWP %ld.", |
2124 | WSTOPSIG (*wstat), lwpid_of (thread)); | |
fa593d66 PA |
2125 | |
2126 | if (debug_threads) | |
2127 | { | |
013e3554 | 2128 | for (const auto &sig : lwp->pending_signals_to_report) |
c058728c | 2129 | threads_debug_printf (" Already queued %d", sig.signal); |
fa593d66 | 2130 | |
c058728c | 2131 | threads_debug_printf (" (no more currently queued signals)"); |
fa593d66 PA |
2132 | } |
2133 | ||
1a981360 PA |
2134 | /* Don't enqueue non-RT signals if they are already in the deferred |
2135 | queue. (SIGSTOP being the easiest signal to see ending up here | |
2136 | twice) */ | |
2137 | if (WSTOPSIG (*wstat) < __SIGRTMIN) | |
2138 | { | |
013e3554 | 2139 | for (const auto &sig : lwp->pending_signals_to_report) |
1a981360 | 2140 | { |
013e3554 | 2141 | if (sig.signal == WSTOPSIG (*wstat)) |
1a981360 | 2142 | { |
c058728c SM |
2143 | threads_debug_printf |
2144 | ("Not requeuing already queued non-RT signal %d for LWP %ld", | |
2145 | sig.signal, lwpid_of (thread)); | |
1a981360 PA |
2146 | return; |
2147 | } | |
2148 | } | |
2149 | } | |
2150 | ||
013e3554 | 2151 | lwp->pending_signals_to_report.emplace_back (WSTOPSIG (*wstat)); |
8d749320 | 2152 | |
d86d4aaf | 2153 | ptrace (PTRACE_GETSIGINFO, lwpid_of (thread), (PTRACE_TYPE_ARG3) 0, |
013e3554 | 2154 | &lwp->pending_signals_to_report.back ().info); |
fa593d66 PA |
2155 | } |
2156 | ||
2157 | /* Dequeue one signal from the "signals to report later when out of | |
2158 | the jump pad" list. */ | |
2159 | ||
2160 | static int | |
2161 | dequeue_one_deferred_signal (struct lwp_info *lwp, int *wstat) | |
2162 | { | |
d86d4aaf DE |
2163 | struct thread_info *thread = get_lwp_thread (lwp); |
2164 | ||
013e3554 | 2165 | if (!lwp->pending_signals_to_report.empty ()) |
fa593d66 | 2166 | { |
013e3554 | 2167 | const pending_signal &p_sig = lwp->pending_signals_to_report.front (); |
fa593d66 | 2168 | |
013e3554 TBA |
2169 | *wstat = W_STOPCODE (p_sig.signal); |
2170 | if (p_sig.info.si_signo != 0) | |
d86d4aaf | 2171 | ptrace (PTRACE_SETSIGINFO, lwpid_of (thread), (PTRACE_TYPE_ARG3) 0, |
013e3554 TBA |
2172 | &p_sig.info); |
2173 | ||
2174 | lwp->pending_signals_to_report.pop_front (); | |
fa593d66 | 2175 | |
c058728c SM |
2176 | threads_debug_printf ("Reporting deferred signal %d for LWP %ld.", |
2177 | WSTOPSIG (*wstat), lwpid_of (thread)); | |
fa593d66 PA |
2178 | |
2179 | if (debug_threads) | |
2180 | { | |
013e3554 | 2181 | for (const auto &sig : lwp->pending_signals_to_report) |
c058728c | 2182 | threads_debug_printf (" Still queued %d", sig.signal); |
fa593d66 | 2183 | |
c058728c | 2184 | threads_debug_printf (" (no more queued signals)"); |
fa593d66 PA |
2185 | } |
2186 | ||
2187 | return 1; | |
2188 | } | |
2189 | ||
2190 | return 0; | |
2191 | } | |
2192 | ||
ac1bbaca TBA |
2193 | bool |
2194 | linux_process_target::check_stopped_by_watchpoint (lwp_info *child) | |
582511be | 2195 | { |
24583e45 TBA |
2196 | scoped_restore_current_thread restore_thread; |
2197 | switch_to_thread (get_lwp_thread (child)); | |
d50171e4 | 2198 | |
ac1bbaca TBA |
2199 | if (low_stopped_by_watchpoint ()) |
2200 | { | |
2201 | child->stop_reason = TARGET_STOPPED_BY_WATCHPOINT; | |
2202 | child->stopped_data_address = low_stopped_data_address (); | |
2203 | } | |
582511be | 2204 | |
ac1bbaca TBA |
2205 | return child->stop_reason == TARGET_STOPPED_BY_WATCHPOINT; |
2206 | } | |
d50171e4 | 2207 | |
ac1bbaca TBA |
2208 | bool |
2209 | linux_process_target::low_stopped_by_watchpoint () | |
2210 | { | |
2211 | return false; | |
2212 | } | |
d50171e4 | 2213 | |
ac1bbaca TBA |
2214 | CORE_ADDR |
2215 | linux_process_target::low_stopped_data_address () | |
2216 | { | |
2217 | return 0; | |
c4d9ceb6 YQ |
2218 | } |
2219 | ||
de0d863e DB |
2220 | /* Return the ptrace options that we want to try to enable. */ |
2221 | ||
2222 | static int | |
2223 | linux_low_ptrace_options (int attached) | |
2224 | { | |
c12a5089 | 2225 | client_state &cs = get_client_state (); |
de0d863e DB |
2226 | int options = 0; |
2227 | ||
2228 | if (!attached) | |
2229 | options |= PTRACE_O_EXITKILL; | |
2230 | ||
c12a5089 | 2231 | if (cs.report_fork_events) |
de0d863e DB |
2232 | options |= PTRACE_O_TRACEFORK; |
2233 | ||
c12a5089 | 2234 | if (cs.report_vfork_events) |
c269dbdb DB |
2235 | options |= (PTRACE_O_TRACEVFORK | PTRACE_O_TRACEVFORKDONE); |
2236 | ||
c12a5089 | 2237 | if (cs.report_exec_events) |
94585166 DB |
2238 | options |= PTRACE_O_TRACEEXEC; |
2239 | ||
82075af2 JS |
2240 | options |= PTRACE_O_TRACESYSGOOD; |
2241 | ||
de0d863e DB |
2242 | return options; |
2243 | } | |
2244 | ||
1a48f002 | 2245 | void |
d16f3f6c | 2246 | linux_process_target::filter_event (int lwpid, int wstat) |
fa96cb38 PA |
2247 | { |
2248 | struct lwp_info *child; | |
2249 | struct thread_info *thread; | |
582511be | 2250 | int have_stop_pc = 0; |
fa96cb38 | 2251 | |
f2907e49 | 2252 | child = find_lwp_pid (ptid_t (lwpid)); |
fa96cb38 | 2253 | |
5406bc3f PA |
2254 | /* Check for events reported by anything not in our LWP list. */ |
2255 | if (child == nullptr) | |
94585166 | 2256 | { |
5406bc3f PA |
2257 | if (WIFSTOPPED (wstat)) |
2258 | { | |
2259 | if (WSTOPSIG (wstat) == SIGTRAP | |
2260 | && linux_ptrace_get_extended_event (wstat) == PTRACE_EVENT_EXEC) | |
2261 | { | |
2262 | /* A non-leader thread exec'ed after we've seen the | |
2263 | leader zombie, and removed it from our lists (in | |
2264 | check_zombie_leaders). The non-leader thread changes | |
2265 | its tid to the tgid. */ | |
2266 | threads_debug_printf | |
2267 | ("Re-adding thread group leader LWP %d after exec.", | |
2268 | lwpid); | |
94585166 | 2269 | |
5406bc3f PA |
2270 | child = add_lwp (ptid_t (lwpid, lwpid)); |
2271 | child->stopped = 1; | |
2272 | switch_to_thread (child->thread); | |
2273 | } | |
2274 | else | |
2275 | { | |
2276 | /* A process we are controlling has forked and the new | |
2277 | child's stop was reported to us by the kernel. Save | |
2278 | its PID and go back to waiting for the fork event to | |
2279 | be reported - the stopped process might be returned | |
2280 | from waitpid before or after the fork event is. */ | |
2281 | threads_debug_printf | |
2282 | ("Saving LWP %d status %s in stopped_pids list", | |
2283 | lwpid, status_to_str (wstat).c_str ()); | |
2284 | add_to_pid_list (&stopped_pids, lwpid, wstat); | |
2285 | } | |
2286 | } | |
2287 | else | |
2288 | { | |
2289 | /* Don't report an event for the exit of an LWP not in our | |
2290 | list, i.e. not part of any inferior we're debugging. | |
2291 | This can happen if we detach from a program we originally | |
8a841a35 PA |
2292 | forked and then it exits. However, note that we may have |
2293 | earlier deleted a leader of an inferior we're debugging, | |
2294 | in check_zombie_leaders. Re-add it back here if so. */ | |
2295 | find_process ([&] (process_info *proc) | |
2296 | { | |
2297 | if (proc->pid == lwpid) | |
2298 | { | |
2299 | threads_debug_printf | |
2300 | ("Re-adding thread group leader LWP %d after exit.", | |
2301 | lwpid); | |
2302 | ||
2303 | child = add_lwp (ptid_t (lwpid, lwpid)); | |
2304 | return true; | |
2305 | } | |
2306 | return false; | |
2307 | }); | |
5406bc3f | 2308 | } |
94585166 | 2309 | |
5406bc3f PA |
2310 | if (child == nullptr) |
2311 | return; | |
fa96cb38 | 2312 | } |
fa96cb38 PA |
2313 | |
2314 | thread = get_lwp_thread (child); | |
2315 | ||
2316 | child->stopped = 1; | |
2317 | ||
2318 | child->last_status = wstat; | |
2319 | ||
582511be PA |
2320 | /* Check if the thread has exited. */ |
2321 | if ((WIFEXITED (wstat) || WIFSIGNALED (wstat))) | |
2322 | { | |
c058728c | 2323 | threads_debug_printf ("%d exited", lwpid); |
f50bf8e5 YQ |
2324 | |
2325 | if (finish_step_over (child)) | |
2326 | { | |
2327 | /* Unsuspend all other LWPs, and set them back running again. */ | |
2328 | unsuspend_all_lwps (child); | |
2329 | } | |
2330 | ||
8a841a35 PA |
2331 | /* If this is not the leader LWP, then the exit signal was not |
2332 | the end of the debugged application and should be ignored, | |
2333 | unless GDB wants to hear about thread exits. */ | |
48989498 | 2334 | if (report_exit_events_for (thread) || is_leader (thread)) |
582511be | 2335 | { |
65706a29 PA |
2336 | /* Since events are serialized to GDB core, and we can't |
2337 | report this one right now. Leave the status pending for | |
2338 | the next time we're able to report it. */ | |
2339 | mark_lwp_dead (child, wstat); | |
1a48f002 | 2340 | return; |
582511be PA |
2341 | } |
2342 | else | |
2343 | { | |
65706a29 | 2344 | delete_lwp (child); |
1a48f002 | 2345 | return; |
582511be PA |
2346 | } |
2347 | } | |
2348 | ||
2349 | gdb_assert (WIFSTOPPED (wstat)); | |
2350 | ||
fa96cb38 PA |
2351 | if (WIFSTOPPED (wstat)) |
2352 | { | |
2353 | struct process_info *proc; | |
2354 | ||
c06cbd92 | 2355 | /* Architecture-specific setup after inferior is running. */ |
fa96cb38 | 2356 | proc = find_process_pid (pid_of (thread)); |
c06cbd92 | 2357 | if (proc->tdesc == NULL) |
fa96cb38 | 2358 | { |
c06cbd92 YQ |
2359 | if (proc->attached) |
2360 | { | |
c06cbd92 YQ |
2361 | /* This needs to happen after we have attached to the |
2362 | inferior and it is stopped for the first time, but | |
2363 | before we access any inferior registers. */ | |
797bcff5 | 2364 | arch_setup_thread (thread); |
c06cbd92 YQ |
2365 | } |
2366 | else | |
2367 | { | |
2368 | /* The process is started, but GDBserver will do | |
2369 | architecture-specific setup after the program stops at | |
2370 | the first instruction. */ | |
2371 | child->status_pending_p = 1; | |
2372 | child->status_pending = wstat; | |
1a48f002 | 2373 | return; |
c06cbd92 | 2374 | } |
fa96cb38 PA |
2375 | } |
2376 | } | |
2377 | ||
fa96cb38 PA |
2378 | if (WIFSTOPPED (wstat) && child->must_set_ptrace_flags) |
2379 | { | |
beed38b8 | 2380 | struct process_info *proc = find_process_pid (pid_of (thread)); |
de0d863e | 2381 | int options = linux_low_ptrace_options (proc->attached); |
beed38b8 | 2382 | |
de0d863e | 2383 | linux_enable_event_reporting (lwpid, options); |
fa96cb38 PA |
2384 | child->must_set_ptrace_flags = 0; |
2385 | } | |
2386 | ||
82075af2 JS |
2387 | /* Always update syscall_state, even if it will be filtered later. */ |
2388 | if (WIFSTOPPED (wstat) && WSTOPSIG (wstat) == SYSCALL_SIGTRAP) | |
2389 | { | |
2390 | child->syscall_state | |
2391 | = (child->syscall_state == TARGET_WAITKIND_SYSCALL_ENTRY | |
2392 | ? TARGET_WAITKIND_SYSCALL_RETURN | |
2393 | : TARGET_WAITKIND_SYSCALL_ENTRY); | |
2394 | } | |
2395 | else | |
2396 | { | |
2397 | /* Almost all other ptrace-stops are known to be outside of system | |
2398 | calls, with further exceptions in handle_extended_wait. */ | |
2399 | child->syscall_state = TARGET_WAITKIND_IGNORE; | |
2400 | } | |
2401 | ||
e7ad2f14 PA |
2402 | /* Be careful to not overwrite stop_pc until save_stop_reason is |
2403 | called. */ | |
fa96cb38 | 2404 | if (WIFSTOPPED (wstat) && WSTOPSIG (wstat) == SIGTRAP |
89a5711c | 2405 | && linux_is_extended_waitstatus (wstat)) |
fa96cb38 | 2406 | { |
582511be | 2407 | child->stop_pc = get_pc (child); |
94585166 | 2408 | if (handle_extended_wait (&child, wstat)) |
de0d863e DB |
2409 | { |
2410 | /* The event has been handled, so just return without | |
2411 | reporting it. */ | |
1a48f002 | 2412 | return; |
de0d863e | 2413 | } |
fa96cb38 PA |
2414 | } |
2415 | ||
80aea927 | 2416 | if (linux_wstatus_maybe_breakpoint (wstat)) |
582511be | 2417 | { |
e7ad2f14 | 2418 | if (save_stop_reason (child)) |
582511be PA |
2419 | have_stop_pc = 1; |
2420 | } | |
2421 | ||
2422 | if (!have_stop_pc) | |
2423 | child->stop_pc = get_pc (child); | |
2424 | ||
fa96cb38 PA |
2425 | if (WIFSTOPPED (wstat) && WSTOPSIG (wstat) == SIGSTOP |
2426 | && child->stop_expected) | |
2427 | { | |
c058728c SM |
2428 | threads_debug_printf ("Expected stop."); |
2429 | ||
fa96cb38 PA |
2430 | child->stop_expected = 0; |
2431 | ||
2432 | if (thread->last_resume_kind == resume_stop) | |
2433 | { | |
2434 | /* We want to report the stop to the core. Treat the | |
2435 | SIGSTOP as a normal event. */ | |
c058728c SM |
2436 | threads_debug_printf ("resume_stop SIGSTOP caught for %s.", |
2437 | target_pid_to_str (ptid_of (thread)).c_str ()); | |
fa96cb38 PA |
2438 | } |
2439 | else if (stopping_threads != NOT_STOPPING_THREADS) | |
2440 | { | |
2441 | /* Stopping threads. We don't want this SIGSTOP to end up | |
582511be | 2442 | pending. */ |
c058728c SM |
2443 | threads_debug_printf ("SIGSTOP caught for %s while stopping threads.", |
2444 | target_pid_to_str (ptid_of (thread)).c_str ()); | |
1a48f002 | 2445 | return; |
fa96cb38 PA |
2446 | } |
2447 | else | |
2448 | { | |
2bf6fb9d | 2449 | /* This is a delayed SIGSTOP. Filter out the event. */ |
c058728c | 2450 | threads_debug_printf ("%s %s, 0, 0 (discard delayed SIGSTOP)", |
2bf6fb9d | 2451 | child->stepping ? "step" : "continue", |
61d7f128 | 2452 | target_pid_to_str (ptid_of (thread)).c_str ()); |
2bf6fb9d | 2453 | |
df95181f | 2454 | resume_one_lwp (child, child->stepping, 0, NULL); |
1a48f002 | 2455 | return; |
fa96cb38 PA |
2456 | } |
2457 | } | |
2458 | ||
582511be PA |
2459 | child->status_pending_p = 1; |
2460 | child->status_pending = wstat; | |
1a48f002 | 2461 | return; |
fa96cb38 PA |
2462 | } |
2463 | ||
b31cdfa6 TBA |
2464 | bool |
2465 | linux_process_target::maybe_hw_step (thread_info *thread) | |
f79b145d | 2466 | { |
b31cdfa6 TBA |
2467 | if (supports_hardware_single_step ()) |
2468 | return true; | |
f79b145d YQ |
2469 | else |
2470 | { | |
3b9a79ef | 2471 | /* GDBserver must insert single-step breakpoint for software |
f79b145d | 2472 | single step. */ |
3b9a79ef | 2473 | gdb_assert (has_single_step_breakpoints (thread)); |
b31cdfa6 | 2474 | return false; |
f79b145d YQ |
2475 | } |
2476 | } | |
2477 | ||
df95181f TBA |
2478 | void |
2479 | linux_process_target::resume_stopped_resumed_lwps (thread_info *thread) | |
20ba1ce6 | 2480 | { |
20ba1ce6 PA |
2481 | struct lwp_info *lp = get_thread_lwp (thread); |
2482 | ||
2483 | if (lp->stopped | |
863d01bd | 2484 | && !lp->suspended |
20ba1ce6 | 2485 | && !lp->status_pending_p |
183be222 | 2486 | && thread->last_status.kind () == TARGET_WAITKIND_IGNORE) |
20ba1ce6 | 2487 | { |
8901d193 YQ |
2488 | int step = 0; |
2489 | ||
2490 | if (thread->last_resume_kind == resume_step) | |
b6d8d612 KB |
2491 | { |
2492 | if (supports_software_single_step ()) | |
2493 | install_software_single_step_breakpoints (lp); | |
2494 | ||
2495 | step = maybe_hw_step (thread); | |
2496 | } | |
20ba1ce6 | 2497 | |
c058728c SM |
2498 | threads_debug_printf ("resuming stopped-resumed LWP %s at %s: step=%d", |
2499 | target_pid_to_str (ptid_of (thread)).c_str (), | |
2500 | paddress (lp->stop_pc), step); | |
20ba1ce6 | 2501 | |
df95181f | 2502 | resume_one_lwp (lp, step, GDB_SIGNAL_0, NULL); |
20ba1ce6 PA |
2503 | } |
2504 | } | |
2505 | ||
d16f3f6c TBA |
2506 | int |
2507 | linux_process_target::wait_for_event_filtered (ptid_t wait_ptid, | |
2508 | ptid_t filter_ptid, | |
2509 | int *wstatp, int options) | |
0d62e5e8 | 2510 | { |
d86d4aaf | 2511 | struct thread_info *event_thread; |
d50171e4 | 2512 | struct lwp_info *event_child, *requested_child; |
fa96cb38 | 2513 | sigset_t block_mask, prev_mask; |
d50171e4 | 2514 | |
fa96cb38 | 2515 | retry: |
d86d4aaf DE |
2516 | /* N.B. event_thread points to the thread_info struct that contains |
2517 | event_child. Keep them in sync. */ | |
2518 | event_thread = NULL; | |
d50171e4 PA |
2519 | event_child = NULL; |
2520 | requested_child = NULL; | |
0d62e5e8 | 2521 | |
95954743 | 2522 | /* Check for a lwp with a pending status. */ |
bd99dc85 | 2523 | |
d7e15655 | 2524 | if (filter_ptid == minus_one_ptid || filter_ptid.is_pid ()) |
0d62e5e8 | 2525 | { |
83e1b6c1 SM |
2526 | event_thread = find_thread_in_random ([&] (thread_info *thread) |
2527 | { | |
2528 | return status_pending_p_callback (thread, filter_ptid); | |
2529 | }); | |
2530 | ||
d86d4aaf | 2531 | if (event_thread != NULL) |
c058728c SM |
2532 | { |
2533 | event_child = get_thread_lwp (event_thread); | |
2534 | threads_debug_printf ("Got a pending child %ld", lwpid_of (event_thread)); | |
2535 | } | |
0d62e5e8 | 2536 | } |
d7e15655 | 2537 | else if (filter_ptid != null_ptid) |
0d62e5e8 | 2538 | { |
fa96cb38 | 2539 | requested_child = find_lwp_pid (filter_ptid); |
59487af3 | 2540 | gdb_assert (requested_child != nullptr); |
d50171e4 | 2541 | |
bde24c0a | 2542 | if (stopping_threads == NOT_STOPPING_THREADS |
fa593d66 | 2543 | && requested_child->status_pending_p |
229d26fc SM |
2544 | && (requested_child->collecting_fast_tracepoint |
2545 | != fast_tpoint_collect_result::not_collecting)) | |
fa593d66 PA |
2546 | { |
2547 | enqueue_one_deferred_signal (requested_child, | |
2548 | &requested_child->status_pending); | |
2549 | requested_child->status_pending_p = 0; | |
2550 | requested_child->status_pending = 0; | |
df95181f | 2551 | resume_one_lwp (requested_child, 0, 0, NULL); |
fa593d66 PA |
2552 | } |
2553 | ||
2554 | if (requested_child->suspended | |
2555 | && requested_child->status_pending_p) | |
38e08fca | 2556 | { |
f34652de | 2557 | internal_error ("requesting an event out of a" |
38e08fca GB |
2558 | " suspended child?"); |
2559 | } | |
fa593d66 | 2560 | |
d50171e4 | 2561 | if (requested_child->status_pending_p) |
d86d4aaf DE |
2562 | { |
2563 | event_child = requested_child; | |
2564 | event_thread = get_lwp_thread (event_child); | |
2565 | } | |
0d62e5e8 | 2566 | } |
611cb4a5 | 2567 | |
0d62e5e8 DJ |
2568 | if (event_child != NULL) |
2569 | { | |
c058728c SM |
2570 | threads_debug_printf ("Got an event from pending child %ld (%04x)", |
2571 | lwpid_of (event_thread), | |
2572 | event_child->status_pending); | |
2573 | ||
fa96cb38 | 2574 | *wstatp = event_child->status_pending; |
bd99dc85 PA |
2575 | event_child->status_pending_p = 0; |
2576 | event_child->status_pending = 0; | |
24583e45 | 2577 | switch_to_thread (event_thread); |
d86d4aaf | 2578 | return lwpid_of (event_thread); |
0d62e5e8 DJ |
2579 | } |
2580 | ||
fa96cb38 PA |
2581 | /* But if we don't find a pending event, we'll have to wait. |
2582 | ||
2583 | We only enter this loop if no process has a pending wait status. | |
2584 | Thus any action taken in response to a wait status inside this | |
2585 | loop is responding as soon as we detect the status, not after any | |
2586 | pending events. */ | |
d8301ad1 | 2587 | |
fa96cb38 PA |
2588 | /* Make sure SIGCHLD is blocked until the sigsuspend below. Block |
2589 | all signals while here. */ | |
2590 | sigfillset (&block_mask); | |
21987b9c | 2591 | gdb_sigmask (SIG_BLOCK, &block_mask, &prev_mask); |
fa96cb38 | 2592 | |
582511be PA |
2593 | /* Always pull all events out of the kernel. We'll randomly select |
2594 | an event LWP out of all that have events, to prevent | |
2595 | starvation. */ | |
fa96cb38 | 2596 | while (event_child == NULL) |
0d62e5e8 | 2597 | { |
fa96cb38 | 2598 | pid_t ret = 0; |
0d62e5e8 | 2599 | |
fa96cb38 PA |
2600 | /* Always use -1 and WNOHANG, due to couple of a kernel/ptrace |
2601 | quirks: | |
0d62e5e8 | 2602 | |
fa96cb38 PA |
2603 | - If the thread group leader exits while other threads in the |
2604 | thread group still exist, waitpid(TGID, ...) hangs. That | |
2605 | waitpid won't return an exit status until the other threads | |
2606 | in the group are reaped. | |
611cb4a5 | 2607 | |
fa96cb38 PA |
2608 | - When a non-leader thread execs, that thread just vanishes |
2609 | without reporting an exit (so we'd hang if we waited for it | |
2610 | explicitly in that case). The exec event is reported to | |
94585166 | 2611 | the TGID pid. */ |
fa96cb38 PA |
2612 | errno = 0; |
2613 | ret = my_waitpid (-1, wstatp, options | WNOHANG); | |
d8301ad1 | 2614 | |
c058728c SM |
2615 | threads_debug_printf ("waitpid(-1, ...) returned %d, %s", |
2616 | ret, errno ? safe_strerror (errno) : "ERRNO-OK"); | |
0d62e5e8 | 2617 | |
fa96cb38 | 2618 | if (ret > 0) |
0d62e5e8 | 2619 | { |
c058728c SM |
2620 | threads_debug_printf ("waitpid %ld received %s", |
2621 | (long) ret, status_to_str (*wstatp).c_str ()); | |
89be2091 | 2622 | |
582511be PA |
2623 | /* Filter all events. IOW, leave all events pending. We'll |
2624 | randomly select an event LWP out of all that have events | |
2625 | below. */ | |
d16f3f6c | 2626 | filter_event (ret, *wstatp); |
fa96cb38 PA |
2627 | /* Retry until nothing comes out of waitpid. A single |
2628 | SIGCHLD can indicate more than one child stopped. */ | |
89be2091 DJ |
2629 | continue; |
2630 | } | |
2631 | ||
20ba1ce6 PA |
2632 | /* Now that we've pulled all events out of the kernel, resume |
2633 | LWPs that don't have an interesting event to report. */ | |
2634 | if (stopping_threads == NOT_STOPPING_THREADS) | |
df95181f TBA |
2635 | for_each_thread ([this] (thread_info *thread) |
2636 | { | |
2637 | resume_stopped_resumed_lwps (thread); | |
2638 | }); | |
20ba1ce6 PA |
2639 | |
2640 | /* ... and find an LWP with a status to report to the core, if | |
2641 | any. */ | |
83e1b6c1 SM |
2642 | event_thread = find_thread_in_random ([&] (thread_info *thread) |
2643 | { | |
2644 | return status_pending_p_callback (thread, filter_ptid); | |
2645 | }); | |
2646 | ||
582511be PA |
2647 | if (event_thread != NULL) |
2648 | { | |
2649 | event_child = get_thread_lwp (event_thread); | |
2650 | *wstatp = event_child->status_pending; | |
2651 | event_child->status_pending_p = 0; | |
2652 | event_child->status_pending = 0; | |
2653 | break; | |
2654 | } | |
2655 | ||
fa96cb38 PA |
2656 | /* Check for zombie thread group leaders. Those can't be reaped |
2657 | until all other threads in the thread group are. */ | |
2658 | check_zombie_leaders (); | |
2659 | ||
a1385b7b SM |
2660 | auto not_stopped = [&] (thread_info *thread) |
2661 | { | |
2662 | return not_stopped_callback (thread, wait_ptid); | |
2663 | }; | |
2664 | ||
fa96cb38 PA |
2665 | /* If there are no resumed children left in the set of LWPs we |
2666 | want to wait for, bail. We can't just block in | |
2667 | waitpid/sigsuspend, because lwps might have been left stopped | |
2668 | in trace-stop state, and we'd be stuck forever waiting for | |
2669 | their status to change (which would only happen if we resumed | |
2670 | them). Even if WNOHANG is set, this return code is preferred | |
2671 | over 0 (below), as it is more detailed. */ | |
a1385b7b | 2672 | if (find_thread (not_stopped) == NULL) |
a6dbe5df | 2673 | { |
c058728c SM |
2674 | threads_debug_printf ("exit (no unwaited-for LWP)"); |
2675 | ||
21987b9c | 2676 | gdb_sigmask (SIG_SETMASK, &prev_mask, NULL); |
fa96cb38 | 2677 | return -1; |
a6dbe5df PA |
2678 | } |
2679 | ||
fa96cb38 PA |
2680 | /* No interesting event to report to the caller. */ |
2681 | if ((options & WNOHANG)) | |
24a09b5f | 2682 | { |
c058728c | 2683 | threads_debug_printf ("WNOHANG set, no event found"); |
fa96cb38 | 2684 | |
21987b9c | 2685 | gdb_sigmask (SIG_SETMASK, &prev_mask, NULL); |
fa96cb38 | 2686 | return 0; |
24a09b5f DJ |
2687 | } |
2688 | ||
fa96cb38 | 2689 | /* Block until we get an event reported with SIGCHLD. */ |
c058728c | 2690 | threads_debug_printf ("sigsuspend'ing"); |
d50171e4 | 2691 | |
fa96cb38 | 2692 | sigsuspend (&prev_mask); |
21987b9c | 2693 | gdb_sigmask (SIG_SETMASK, &prev_mask, NULL); |
fa96cb38 PA |
2694 | goto retry; |
2695 | } | |
d50171e4 | 2696 | |
21987b9c | 2697 | gdb_sigmask (SIG_SETMASK, &prev_mask, NULL); |
d50171e4 | 2698 | |
24583e45 | 2699 | switch_to_thread (event_thread); |
d50171e4 | 2700 | |
fa96cb38 PA |
2701 | return lwpid_of (event_thread); |
2702 | } | |
2703 | ||
d16f3f6c TBA |
2704 | int |
2705 | linux_process_target::wait_for_event (ptid_t ptid, int *wstatp, int options) | |
fa96cb38 | 2706 | { |
d16f3f6c | 2707 | return wait_for_event_filtered (ptid, ptid, wstatp, options); |
611cb4a5 DJ |
2708 | } |
2709 | ||
6bf5e0ba PA |
2710 | /* Select one LWP out of those that have events pending. */ |
2711 | ||
2712 | static void | |
2713 | select_event_lwp (struct lwp_info **orig_lp) | |
2714 | { | |
582511be PA |
2715 | struct thread_info *event_thread = NULL; |
2716 | ||
2717 | /* In all-stop, give preference to the LWP that is being | |
2718 | single-stepped. There will be at most one, and it's the LWP that | |
2719 | the core is most interested in. If we didn't do this, then we'd | |
2720 | have to handle pending step SIGTRAPs somehow in case the core | |
2721 | later continues the previously-stepped thread, otherwise we'd | |
2722 | report the pending SIGTRAP, and the core, not having stepped the | |
2723 | thread, wouldn't understand what the trap was for, and therefore | |
2724 | would report it to the user as a random signal. */ | |
2725 | if (!non_stop) | |
6bf5e0ba | 2726 | { |
39a64da5 SM |
2727 | event_thread = find_thread ([] (thread_info *thread) |
2728 | { | |
2729 | lwp_info *lp = get_thread_lwp (thread); | |
2730 | ||
183be222 | 2731 | return (thread->last_status.kind () == TARGET_WAITKIND_IGNORE |
39a64da5 SM |
2732 | && thread->last_resume_kind == resume_step |
2733 | && lp->status_pending_p); | |
2734 | }); | |
2735 | ||
582511be | 2736 | if (event_thread != NULL) |
c058728c SM |
2737 | threads_debug_printf |
2738 | ("Select single-step %s", | |
2739 | target_pid_to_str (ptid_of (event_thread)).c_str ()); | |
6bf5e0ba | 2740 | } |
582511be | 2741 | if (event_thread == NULL) |
6bf5e0ba PA |
2742 | { |
2743 | /* No single-stepping LWP. Select one at random, out of those | |
dda83cd7 | 2744 | which have had events. */ |
6bf5e0ba | 2745 | |
b0319eaa | 2746 | event_thread = find_thread_in_random ([&] (thread_info *thread) |
39a64da5 SM |
2747 | { |
2748 | lwp_info *lp = get_thread_lwp (thread); | |
2749 | ||
b0319eaa | 2750 | /* Only resumed LWPs that have an event pending. */ |
183be222 | 2751 | return (thread->last_status.kind () == TARGET_WAITKIND_IGNORE |
b0319eaa | 2752 | && lp->status_pending_p); |
39a64da5 | 2753 | }); |
6bf5e0ba PA |
2754 | } |
2755 | ||
d86d4aaf | 2756 | if (event_thread != NULL) |
6bf5e0ba | 2757 | { |
d86d4aaf DE |
2758 | struct lwp_info *event_lp = get_thread_lwp (event_thread); |
2759 | ||
6bf5e0ba PA |
2760 | /* Switch the event LWP. */ |
2761 | *orig_lp = event_lp; | |
2762 | } | |
2763 | } | |
2764 | ||
7984d532 PA |
2765 | /* Decrement the suspend count of all LWPs, except EXCEPT, if non |
2766 | NULL. */ | |
2767 | ||
2768 | static void | |
2769 | unsuspend_all_lwps (struct lwp_info *except) | |
2770 | { | |
139720c5 SM |
2771 | for_each_thread ([&] (thread_info *thread) |
2772 | { | |
2773 | lwp_info *lwp = get_thread_lwp (thread); | |
2774 | ||
2775 | if (lwp != except) | |
2776 | lwp_suspended_decr (lwp); | |
2777 | }); | |
7984d532 PA |
2778 | } |
2779 | ||
5a6b0a41 | 2780 | static bool lwp_running (thread_info *thread); |
fa593d66 PA |
2781 | |
2782 | /* Stabilize threads (move out of jump pads). | |
2783 | ||
2784 | If a thread is midway collecting a fast tracepoint, we need to | |
2785 | finish the collection and move it out of the jump pad before | |
2786 | reporting the signal. | |
2787 | ||
2788 | This avoids recursion while collecting (when a signal arrives | |
2789 | midway, and the signal handler itself collects), which would trash | |
2790 | the trace buffer. In case the user set a breakpoint in a signal | |
2791 | handler, this avoids the backtrace showing the jump pad, etc.. | |
2792 | Most importantly, there are certain things we can't do safely if | |
2793 | threads are stopped in a jump pad (or in its callee's). For | |
2794 | example: | |
2795 | ||
2796 | - starting a new trace run. A thread still collecting the | |
2797 | previous run, could trash the trace buffer when resumed. The trace | |
2798 | buffer control structures would have been reset but the thread had | |
2799 | no way to tell. The thread could even midway memcpy'ing to the | |
2800 | buffer, which would mean that when resumed, it would clobber the | |
2801 | trace buffer that had been set for a new run. | |
2802 | ||
2803 | - we can't rewrite/reuse the jump pads for new tracepoints | |
2804 | safely. Say you do tstart while a thread is stopped midway while | |
2805 | collecting. When the thread is later resumed, it finishes the | |
2806 | collection, and returns to the jump pad, to execute the original | |
2807 | instruction that was under the tracepoint jump at the time the | |
2808 | older run had been started. If the jump pad had been rewritten | |
2809 | since for something else in the new run, the thread would now | |
2810 | execute the wrong / random instructions. */ | |
2811 | ||
5c9eb2f2 TBA |
2812 | void |
2813 | linux_process_target::stabilize_threads () | |
fa593d66 | 2814 | { |
13e567af TBA |
2815 | thread_info *thread_stuck = find_thread ([this] (thread_info *thread) |
2816 | { | |
2817 | return stuck_in_jump_pad (thread); | |
2818 | }); | |
fa593d66 | 2819 | |
d86d4aaf | 2820 | if (thread_stuck != NULL) |
fa593d66 | 2821 | { |
c058728c SM |
2822 | threads_debug_printf ("can't stabilize, LWP %ld is stuck in jump pad", |
2823 | lwpid_of (thread_stuck)); | |
fa593d66 PA |
2824 | return; |
2825 | } | |
2826 | ||
24583e45 | 2827 | scoped_restore_current_thread restore_thread; |
fa593d66 PA |
2828 | |
2829 | stabilizing_threads = 1; | |
2830 | ||
2831 | /* Kick 'em all. */ | |
d16f3f6c TBA |
2832 | for_each_thread ([this] (thread_info *thread) |
2833 | { | |
2834 | move_out_of_jump_pad (thread); | |
2835 | }); | |
fa593d66 PA |
2836 | |
2837 | /* Loop until all are stopped out of the jump pads. */ | |
5a6b0a41 | 2838 | while (find_thread (lwp_running) != NULL) |
fa593d66 PA |
2839 | { |
2840 | struct target_waitstatus ourstatus; | |
2841 | struct lwp_info *lwp; | |
fa593d66 PA |
2842 | int wstat; |
2843 | ||
2844 | /* Note that we go through the full wait even loop. While | |
2845 | moving threads out of jump pad, we need to be able to step | |
2846 | over internal breakpoints and such. */ | |
d16f3f6c | 2847 | wait_1 (minus_one_ptid, &ourstatus, 0); |
fa593d66 | 2848 | |
183be222 | 2849 | if (ourstatus.kind () == TARGET_WAITKIND_STOPPED) |
fa593d66 | 2850 | { |
0bfdf32f | 2851 | lwp = get_thread_lwp (current_thread); |
fa593d66 PA |
2852 | |
2853 | /* Lock it. */ | |
863d01bd | 2854 | lwp_suspended_inc (lwp); |
fa593d66 | 2855 | |
183be222 | 2856 | if (ourstatus.sig () != GDB_SIGNAL_0 |
0bfdf32f | 2857 | || current_thread->last_resume_kind == resume_stop) |
fa593d66 | 2858 | { |
183be222 | 2859 | wstat = W_STOPCODE (gdb_signal_to_host (ourstatus.sig ())); |
fa593d66 PA |
2860 | enqueue_one_deferred_signal (lwp, &wstat); |
2861 | } | |
2862 | } | |
2863 | } | |
2864 | ||
fcdad592 | 2865 | unsuspend_all_lwps (NULL); |
fa593d66 PA |
2866 | |
2867 | stabilizing_threads = 0; | |
2868 | ||
b4d51a55 | 2869 | if (debug_threads) |
fa593d66 | 2870 | { |
13e567af TBA |
2871 | thread_stuck = find_thread ([this] (thread_info *thread) |
2872 | { | |
2873 | return stuck_in_jump_pad (thread); | |
2874 | }); | |
fcb056a5 | 2875 | |
d86d4aaf | 2876 | if (thread_stuck != NULL) |
c058728c SM |
2877 | threads_debug_printf |
2878 | ("couldn't stabilize, LWP %ld got stuck in jump pad", | |
2879 | lwpid_of (thread_stuck)); | |
fa593d66 PA |
2880 | } |
2881 | } | |
2882 | ||
582511be PA |
2883 | /* Convenience function that is called when the kernel reports an |
2884 | event that is not passed out to GDB. */ | |
2885 | ||
2886 | static ptid_t | |
2887 | ignore_event (struct target_waitstatus *ourstatus) | |
2888 | { | |
2889 | /* If we got an event, there may still be others, as a single | |
2890 | SIGCHLD can indicate more than one child stopped. This forces | |
2891 | another target_wait call. */ | |
2892 | async_file_mark (); | |
2893 | ||
183be222 | 2894 | ourstatus->set_ignore (); |
582511be PA |
2895 | return null_ptid; |
2896 | } | |
2897 | ||
fd000fb3 TBA |
2898 | ptid_t |
2899 | linux_process_target::filter_exit_event (lwp_info *event_child, | |
2900 | target_waitstatus *ourstatus) | |
65706a29 PA |
2901 | { |
2902 | struct thread_info *thread = get_lwp_thread (event_child); | |
2903 | ptid_t ptid = ptid_of (thread); | |
2904 | ||
48989498 PA |
2905 | /* Note we must filter TARGET_WAITKIND_SIGNALLED as well, otherwise |
2906 | if a non-leader thread exits with a signal, we'd report it to the | |
2907 | core which would interpret it as the whole-process exiting. | |
2908 | There is no TARGET_WAITKIND_THREAD_SIGNALLED event kind. */ | |
2909 | if (ourstatus->kind () != TARGET_WAITKIND_EXITED | |
2910 | && ourstatus->kind () != TARGET_WAITKIND_SIGNALLED) | |
2911 | return ptid; | |
2912 | ||
8a841a35 | 2913 | if (!is_leader (thread)) |
65706a29 | 2914 | { |
48989498 | 2915 | if (report_exit_events_for (thread)) |
183be222 | 2916 | ourstatus->set_thread_exited (0); |
65706a29 | 2917 | else |
183be222 | 2918 | ourstatus->set_ignore (); |
65706a29 PA |
2919 | |
2920 | delete_lwp (event_child); | |
2921 | } | |
2922 | return ptid; | |
2923 | } | |
2924 | ||
82075af2 JS |
2925 | /* Returns 1 if GDB is interested in any event_child syscalls. */ |
2926 | ||
2927 | static int | |
2928 | gdb_catching_syscalls_p (struct lwp_info *event_child) | |
2929 | { | |
2930 | struct thread_info *thread = get_lwp_thread (event_child); | |
2931 | struct process_info *proc = get_thread_process (thread); | |
2932 | ||
f27866ba | 2933 | return !proc->syscalls_to_catch.empty (); |
82075af2 JS |
2934 | } |
2935 | ||
9eedd27d TBA |
2936 | bool |
2937 | linux_process_target::gdb_catch_this_syscall (lwp_info *event_child) | |
82075af2 | 2938 | { |
4cc32bec | 2939 | int sysno; |
82075af2 JS |
2940 | struct thread_info *thread = get_lwp_thread (event_child); |
2941 | struct process_info *proc = get_thread_process (thread); | |
2942 | ||
f27866ba | 2943 | if (proc->syscalls_to_catch.empty ()) |
9eedd27d | 2944 | return false; |
82075af2 | 2945 | |
f27866ba | 2946 | if (proc->syscalls_to_catch[0] == ANY_SYSCALL) |
9eedd27d | 2947 | return true; |
82075af2 | 2948 | |
4cc32bec | 2949 | get_syscall_trapinfo (event_child, &sysno); |
f27866ba SM |
2950 | |
2951 | for (int iter : proc->syscalls_to_catch) | |
82075af2 | 2952 | if (iter == sysno) |
9eedd27d | 2953 | return true; |
82075af2 | 2954 | |
9eedd27d | 2955 | return false; |
82075af2 JS |
2956 | } |
2957 | ||
d16f3f6c TBA |
2958 | ptid_t |
2959 | linux_process_target::wait_1 (ptid_t ptid, target_waitstatus *ourstatus, | |
b60cea74 | 2960 | target_wait_flags target_options) |
da6d8c04 | 2961 | { |
c058728c SM |
2962 | THREADS_SCOPED_DEBUG_ENTER_EXIT; |
2963 | ||
c12a5089 | 2964 | client_state &cs = get_client_state (); |
e5f1222d | 2965 | int w; |
fc7238bb | 2966 | struct lwp_info *event_child; |
bd99dc85 | 2967 | int options; |
bd99dc85 | 2968 | int pid; |
6bf5e0ba PA |
2969 | int step_over_finished; |
2970 | int bp_explains_trap; | |
2971 | int maybe_internal_trap; | |
2972 | int report_to_gdb; | |
219f2f23 | 2973 | int trace_event; |
c2d6af84 | 2974 | int in_step_range; |
f2faf941 | 2975 | int any_resumed; |
bd99dc85 | 2976 | |
c058728c | 2977 | threads_debug_printf ("[%s]", target_pid_to_str (ptid).c_str ()); |
87ce2a04 | 2978 | |
bd99dc85 PA |
2979 | /* Translate generic target options into linux options. */ |
2980 | options = __WALL; | |
2981 | if (target_options & TARGET_WNOHANG) | |
2982 | options |= WNOHANG; | |
0d62e5e8 | 2983 | |
fa593d66 PA |
2984 | bp_explains_trap = 0; |
2985 | trace_event = 0; | |
c2d6af84 | 2986 | in_step_range = 0; |
183be222 | 2987 | ourstatus->set_ignore (); |
bd99dc85 | 2988 | |
83e1b6c1 SM |
2989 | auto status_pending_p_any = [&] (thread_info *thread) |
2990 | { | |
2991 | return status_pending_p_callback (thread, minus_one_ptid); | |
2992 | }; | |
2993 | ||
a1385b7b SM |
2994 | auto not_stopped = [&] (thread_info *thread) |
2995 | { | |
2996 | return not_stopped_callback (thread, minus_one_ptid); | |
2997 | }; | |
2998 | ||
f2faf941 | 2999 | /* Find a resumed LWP, if any. */ |
83e1b6c1 | 3000 | if (find_thread (status_pending_p_any) != NULL) |
f2faf941 | 3001 | any_resumed = 1; |
a1385b7b | 3002 | else if (find_thread (not_stopped) != NULL) |
f2faf941 PA |
3003 | any_resumed = 1; |
3004 | else | |
3005 | any_resumed = 0; | |
3006 | ||
d7e15655 | 3007 | if (step_over_bkpt == null_ptid) |
d16f3f6c | 3008 | pid = wait_for_event (ptid, &w, options); |
6bf5e0ba PA |
3009 | else |
3010 | { | |
c058728c SM |
3011 | threads_debug_printf ("step_over_bkpt set [%s], doing a blocking wait", |
3012 | target_pid_to_str (step_over_bkpt).c_str ()); | |
d16f3f6c | 3013 | pid = wait_for_event (step_over_bkpt, &w, options & ~WNOHANG); |
6bf5e0ba PA |
3014 | } |
3015 | ||
f2faf941 | 3016 | if (pid == 0 || (pid == -1 && !any_resumed)) |
87ce2a04 | 3017 | { |
fa96cb38 PA |
3018 | gdb_assert (target_options & TARGET_WNOHANG); |
3019 | ||
c058728c | 3020 | threads_debug_printf ("ret = null_ptid, TARGET_WAITKIND_IGNORE"); |
fa96cb38 | 3021 | |
183be222 | 3022 | ourstatus->set_ignore (); |
87ce2a04 DE |
3023 | return null_ptid; |
3024 | } | |
fa96cb38 PA |
3025 | else if (pid == -1) |
3026 | { | |
c058728c | 3027 | threads_debug_printf ("ret = null_ptid, TARGET_WAITKIND_NO_RESUMED"); |
bd99dc85 | 3028 | |
183be222 | 3029 | ourstatus->set_no_resumed (); |
fa96cb38 PA |
3030 | return null_ptid; |
3031 | } | |
0d62e5e8 | 3032 | |
0bfdf32f | 3033 | event_child = get_thread_lwp (current_thread); |
0d62e5e8 | 3034 | |
d16f3f6c | 3035 | /* wait_for_event only returns an exit status for the last |
fa96cb38 PA |
3036 | child of a process. Report it. */ |
3037 | if (WIFEXITED (w) || WIFSIGNALED (w)) | |
da6d8c04 | 3038 | { |
fa96cb38 | 3039 | if (WIFEXITED (w)) |
0d62e5e8 | 3040 | { |
183be222 | 3041 | ourstatus->set_exited (WEXITSTATUS (w)); |
bd99dc85 | 3042 | |
c058728c SM |
3043 | threads_debug_printf |
3044 | ("ret = %s, exited with retcode %d", | |
3045 | target_pid_to_str (ptid_of (current_thread)).c_str (), | |
3046 | WEXITSTATUS (w)); | |
fa96cb38 PA |
3047 | } |
3048 | else | |
3049 | { | |
183be222 | 3050 | ourstatus->set_signalled (gdb_signal_from_host (WTERMSIG (w))); |
5b1c542e | 3051 | |
c058728c SM |
3052 | threads_debug_printf |
3053 | ("ret = %s, terminated with signal %d", | |
3054 | target_pid_to_str (ptid_of (current_thread)).c_str (), | |
3055 | WTERMSIG (w)); | |
0d62e5e8 | 3056 | } |
fa96cb38 | 3057 | |
48989498 | 3058 | return filter_exit_event (event_child, ourstatus); |
da6d8c04 DJ |
3059 | } |
3060 | ||
2d97cd35 AT |
3061 | /* If step-over executes a breakpoint instruction, in the case of a |
3062 | hardware single step it means a gdb/gdbserver breakpoint had been | |
3063 | planted on top of a permanent breakpoint, in the case of a software | |
3064 | single step it may just mean that gdbserver hit the reinsert breakpoint. | |
e7ad2f14 | 3065 | The PC has been adjusted by save_stop_reason to point at |
2d97cd35 AT |
3066 | the breakpoint address. |
3067 | So in the case of the hardware single step advance the PC manually | |
3068 | past the breakpoint and in the case of software single step advance only | |
3b9a79ef | 3069 | if it's not the single_step_breakpoint we are hitting. |
2d97cd35 AT |
3070 | This avoids that a program would keep trapping a permanent breakpoint |
3071 | forever. */ | |
d7e15655 | 3072 | if (step_over_bkpt != null_ptid |
2d97cd35 AT |
3073 | && event_child->stop_reason == TARGET_STOPPED_BY_SW_BREAKPOINT |
3074 | && (event_child->stepping | |
3b9a79ef | 3075 | || !single_step_breakpoint_inserted_here (event_child->stop_pc))) |
8090aef2 | 3076 | { |
dd373349 AT |
3077 | int increment_pc = 0; |
3078 | int breakpoint_kind = 0; | |
3079 | CORE_ADDR stop_pc = event_child->stop_pc; | |
3080 | ||
d16f3f6c TBA |
3081 | breakpoint_kind = breakpoint_kind_from_current_state (&stop_pc); |
3082 | sw_breakpoint_from_kind (breakpoint_kind, &increment_pc); | |
8090aef2 | 3083 | |
c058728c SM |
3084 | threads_debug_printf |
3085 | ("step-over for %s executed software breakpoint", | |
3086 | target_pid_to_str (ptid_of (current_thread)).c_str ()); | |
8090aef2 PA |
3087 | |
3088 | if (increment_pc != 0) | |
3089 | { | |
3090 | struct regcache *regcache | |
3091 | = get_thread_regcache (current_thread, 1); | |
3092 | ||
3093 | event_child->stop_pc += increment_pc; | |
bf9ae9d8 | 3094 | low_set_pc (regcache, event_child->stop_pc); |
8090aef2 | 3095 | |
d7146cda | 3096 | if (!low_breakpoint_at (event_child->stop_pc)) |
15c66dd6 | 3097 | event_child->stop_reason = TARGET_STOPPED_BY_NO_REASON; |
8090aef2 PA |
3098 | } |
3099 | } | |
3100 | ||
6bf5e0ba PA |
3101 | /* If this event was not handled before, and is not a SIGTRAP, we |
3102 | report it. SIGILL and SIGSEGV are also treated as traps in case | |
3103 | a breakpoint is inserted at the current PC. If this target does | |
3104 | not support internal breakpoints at all, we also report the | |
3105 | SIGTRAP without further processing; it's of no concern to us. */ | |
3106 | maybe_internal_trap | |
bf9ae9d8 | 3107 | = (low_supports_breakpoints () |
6bf5e0ba PA |
3108 | && (WSTOPSIG (w) == SIGTRAP |
3109 | || ((WSTOPSIG (w) == SIGILL | |
3110 | || WSTOPSIG (w) == SIGSEGV) | |
d7146cda | 3111 | && low_breakpoint_at (event_child->stop_pc)))); |
6bf5e0ba PA |
3112 | |
3113 | if (maybe_internal_trap) | |
3114 | { | |
3115 | /* Handle anything that requires bookkeeping before deciding to | |
3116 | report the event or continue waiting. */ | |
3117 | ||
3118 | /* First check if we can explain the SIGTRAP with an internal | |
3119 | breakpoint, or if we should possibly report the event to GDB. | |
3120 | Do this before anything that may remove or insert a | |
3121 | breakpoint. */ | |
3122 | bp_explains_trap = breakpoint_inserted_here (event_child->stop_pc); | |
3123 | ||
3124 | /* We have a SIGTRAP, possibly a step-over dance has just | |
3125 | finished. If so, tweak the state machine accordingly, | |
3b9a79ef YQ |
3126 | reinsert breakpoints and delete any single-step |
3127 | breakpoints. */ | |
6bf5e0ba PA |
3128 | step_over_finished = finish_step_over (event_child); |
3129 | ||
3130 | /* Now invoke the callbacks of any internal breakpoints there. */ | |
3131 | check_breakpoints (event_child->stop_pc); | |
3132 | ||
219f2f23 PA |
3133 | /* Handle tracepoint data collecting. This may overflow the |
3134 | trace buffer, and cause a tracing stop, removing | |
3135 | breakpoints. */ | |
3136 | trace_event = handle_tracepoints (event_child); | |
3137 | ||
6bf5e0ba | 3138 | if (bp_explains_trap) |
c058728c | 3139 | threads_debug_printf ("Hit a gdbserver breakpoint."); |
6bf5e0ba PA |
3140 | } |
3141 | else | |
3142 | { | |
3143 | /* We have some other signal, possibly a step-over dance was in | |
3144 | progress, and it should be cancelled too. */ | |
3145 | step_over_finished = finish_step_over (event_child); | |
fa593d66 PA |
3146 | } |
3147 | ||
3148 | /* We have all the data we need. Either report the event to GDB, or | |
3149 | resume threads and keep waiting for more. */ | |
3150 | ||
3151 | /* If we're collecting a fast tracepoint, finish the collection and | |
3152 | move out of the jump pad before delivering a signal. See | |
3153 | linux_stabilize_threads. */ | |
3154 | ||
3155 | if (WIFSTOPPED (w) | |
3156 | && WSTOPSIG (w) != SIGTRAP | |
3157 | && supports_fast_tracepoints () | |
58b4daa5 | 3158 | && agent_loaded_p ()) |
fa593d66 | 3159 | { |
c058728c SM |
3160 | threads_debug_printf ("Got signal %d for LWP %ld. Check if we need " |
3161 | "to defer or adjust it.", | |
3162 | WSTOPSIG (w), lwpid_of (current_thread)); | |
fa593d66 PA |
3163 | |
3164 | /* Allow debugging the jump pad itself. */ | |
0bfdf32f | 3165 | if (current_thread->last_resume_kind != resume_step |
fa593d66 PA |
3166 | && maybe_move_out_of_jump_pad (event_child, &w)) |
3167 | { | |
3168 | enqueue_one_deferred_signal (event_child, &w); | |
3169 | ||
c058728c SM |
3170 | threads_debug_printf ("Signal %d for LWP %ld deferred (in jump pad)", |
3171 | WSTOPSIG (w), lwpid_of (current_thread)); | |
fa593d66 | 3172 | |
df95181f | 3173 | resume_one_lwp (event_child, 0, 0, NULL); |
582511be PA |
3174 | |
3175 | return ignore_event (ourstatus); | |
fa593d66 PA |
3176 | } |
3177 | } | |
219f2f23 | 3178 | |
229d26fc SM |
3179 | if (event_child->collecting_fast_tracepoint |
3180 | != fast_tpoint_collect_result::not_collecting) | |
fa593d66 | 3181 | { |
c058728c SM |
3182 | threads_debug_printf |
3183 | ("LWP %ld was trying to move out of the jump pad (%d). " | |
3184 | "Check if we're already there.", | |
3185 | lwpid_of (current_thread), | |
3186 | (int) event_child->collecting_fast_tracepoint); | |
fa593d66 PA |
3187 | |
3188 | trace_event = 1; | |
3189 | ||
3190 | event_child->collecting_fast_tracepoint | |
3191 | = linux_fast_tracepoint_collecting (event_child, NULL); | |
3192 | ||
229d26fc SM |
3193 | if (event_child->collecting_fast_tracepoint |
3194 | != fast_tpoint_collect_result::before_insn) | |
fa593d66 PA |
3195 | { |
3196 | /* No longer need this breakpoint. */ | |
3197 | if (event_child->exit_jump_pad_bkpt != NULL) | |
3198 | { | |
c058728c SM |
3199 | threads_debug_printf |
3200 | ("No longer need exit-jump-pad bkpt; removing it." | |
3201 | "stopping all threads momentarily."); | |
fa593d66 PA |
3202 | |
3203 | /* Other running threads could hit this breakpoint. | |
3204 | We don't handle moribund locations like GDB does, | |
3205 | instead we always pause all threads when removing | |
3206 | breakpoints, so that any step-over or | |
3207 | decr_pc_after_break adjustment is always taken | |
3208 | care of while the breakpoint is still | |
3209 | inserted. */ | |
3210 | stop_all_lwps (1, event_child); | |
fa593d66 PA |
3211 | |
3212 | delete_breakpoint (event_child->exit_jump_pad_bkpt); | |
3213 | event_child->exit_jump_pad_bkpt = NULL; | |
3214 | ||
3215 | unstop_all_lwps (1, event_child); | |
3216 | ||
3217 | gdb_assert (event_child->suspended >= 0); | |
3218 | } | |
3219 | } | |
3220 | ||
229d26fc SM |
3221 | if (event_child->collecting_fast_tracepoint |
3222 | == fast_tpoint_collect_result::not_collecting) | |
fa593d66 | 3223 | { |
c058728c SM |
3224 | threads_debug_printf |
3225 | ("fast tracepoint finished collecting successfully."); | |
fa593d66 PA |
3226 | |
3227 | /* We may have a deferred signal to report. */ | |
3228 | if (dequeue_one_deferred_signal (event_child, &w)) | |
c058728c | 3229 | threads_debug_printf ("dequeued one signal."); |
3c11dd79 | 3230 | else |
fa593d66 | 3231 | { |
c058728c | 3232 | threads_debug_printf ("no deferred signals."); |
fa593d66 PA |
3233 | |
3234 | if (stabilizing_threads) | |
3235 | { | |
183be222 | 3236 | ourstatus->set_stopped (GDB_SIGNAL_0); |
87ce2a04 | 3237 | |
c058728c SM |
3238 | threads_debug_printf |
3239 | ("ret = %s, stopped while stabilizing threads", | |
3240 | target_pid_to_str (ptid_of (current_thread)).c_str ()); | |
87ce2a04 | 3241 | |
0bfdf32f | 3242 | return ptid_of (current_thread); |
fa593d66 PA |
3243 | } |
3244 | } | |
3245 | } | |
6bf5e0ba PA |
3246 | } |
3247 | ||
e471f25b PA |
3248 | /* Check whether GDB would be interested in this event. */ |
3249 | ||
82075af2 JS |
3250 | /* Check if GDB is interested in this syscall. */ |
3251 | if (WIFSTOPPED (w) | |
3252 | && WSTOPSIG (w) == SYSCALL_SIGTRAP | |
9eedd27d | 3253 | && !gdb_catch_this_syscall (event_child)) |
82075af2 | 3254 | { |
c058728c SM |
3255 | threads_debug_printf ("Ignored syscall for LWP %ld.", |
3256 | lwpid_of (current_thread)); | |
82075af2 | 3257 | |
df95181f | 3258 | resume_one_lwp (event_child, event_child->stepping, 0, NULL); |
edeeb602 | 3259 | |
82075af2 JS |
3260 | return ignore_event (ourstatus); |
3261 | } | |
3262 | ||
e471f25b PA |
3263 | /* If GDB is not interested in this signal, don't stop other |
3264 | threads, and don't report it to GDB. Just resume the inferior | |
3265 | right away. We do this for threading-related signals as well as | |
3266 | any that GDB specifically requested we ignore. But never ignore | |
3267 | SIGSTOP if we sent it ourselves, and do not ignore signals when | |
3268 | stepping - they may require special handling to skip the signal | |
c9587f88 AT |
3269 | handler. Also never ignore signals that could be caused by a |
3270 | breakpoint. */ | |
e471f25b | 3271 | if (WIFSTOPPED (w) |
0bfdf32f | 3272 | && current_thread->last_resume_kind != resume_step |
e471f25b | 3273 | && ( |
1a981360 | 3274 | #if defined (USE_THREAD_DB) && !defined (__ANDROID__) |
fe978cb0 | 3275 | (current_process ()->priv->thread_db != NULL |
e471f25b PA |
3276 | && (WSTOPSIG (w) == __SIGRTMIN |
3277 | || WSTOPSIG (w) == __SIGRTMIN + 1)) | |
3278 | || | |
3279 | #endif | |
c12a5089 | 3280 | (cs.pass_signals[gdb_signal_from_host (WSTOPSIG (w))] |
e471f25b | 3281 | && !(WSTOPSIG (w) == SIGSTOP |
c9587f88 AT |
3282 | && current_thread->last_resume_kind == resume_stop) |
3283 | && !linux_wstatus_maybe_breakpoint (w)))) | |
e471f25b PA |
3284 | { |
3285 | siginfo_t info, *info_p; | |
3286 | ||
c058728c SM |
3287 | threads_debug_printf ("Ignored signal %d for LWP %ld.", |
3288 | WSTOPSIG (w), lwpid_of (current_thread)); | |
e471f25b | 3289 | |
0bfdf32f | 3290 | if (ptrace (PTRACE_GETSIGINFO, lwpid_of (current_thread), |
b8e1b30e | 3291 | (PTRACE_TYPE_ARG3) 0, &info) == 0) |
e471f25b PA |
3292 | info_p = &info; |
3293 | else | |
3294 | info_p = NULL; | |
863d01bd PA |
3295 | |
3296 | if (step_over_finished) | |
3297 | { | |
3298 | /* We cancelled this thread's step-over above. We still | |
3299 | need to unsuspend all other LWPs, and set them back | |
3300 | running again while the signal handler runs. */ | |
3301 | unsuspend_all_lwps (event_child); | |
3302 | ||
3303 | /* Enqueue the pending signal info so that proceed_all_lwps | |
3304 | doesn't lose it. */ | |
3305 | enqueue_pending_signal (event_child, WSTOPSIG (w), info_p); | |
3306 | ||
3307 | proceed_all_lwps (); | |
3308 | } | |
3309 | else | |
3310 | { | |
df95181f TBA |
3311 | resume_one_lwp (event_child, event_child->stepping, |
3312 | WSTOPSIG (w), info_p); | |
863d01bd | 3313 | } |
edeeb602 | 3314 | |
582511be | 3315 | return ignore_event (ourstatus); |
e471f25b PA |
3316 | } |
3317 | ||
c2d6af84 PA |
3318 | /* Note that all addresses are always "out of the step range" when |
3319 | there's no range to begin with. */ | |
3320 | in_step_range = lwp_in_step_range (event_child); | |
3321 | ||
3322 | /* If GDB wanted this thread to single step, and the thread is out | |
3323 | of the step range, we always want to report the SIGTRAP, and let | |
3324 | GDB handle it. Watchpoints should always be reported. So should | |
3325 | signals we can't explain. A SIGTRAP we can't explain could be a | |
3326 | GDB breakpoint --- we may or not support Z0 breakpoints. If we | |
3327 | do, we're be able to handle GDB breakpoints on top of internal | |
3328 | breakpoints, by handling the internal breakpoint and still | |
3329 | reporting the event to GDB. If we don't, we're out of luck, GDB | |
863d01bd PA |
3330 | won't see the breakpoint hit. If we see a single-step event but |
3331 | the thread should be continuing, don't pass the trap to gdb. | |
3332 | That indicates that we had previously finished a single-step but | |
3333 | left the single-step pending -- see | |
3334 | complete_ongoing_step_over. */ | |
6bf5e0ba | 3335 | report_to_gdb = (!maybe_internal_trap |
0bfdf32f | 3336 | || (current_thread->last_resume_kind == resume_step |
c2d6af84 | 3337 | && !in_step_range) |
15c66dd6 | 3338 | || event_child->stop_reason == TARGET_STOPPED_BY_WATCHPOINT |
863d01bd PA |
3339 | || (!in_step_range |
3340 | && !bp_explains_trap | |
3341 | && !trace_event | |
3342 | && !step_over_finished | |
3343 | && !(current_thread->last_resume_kind == resume_continue | |
3344 | && event_child->stop_reason == TARGET_STOPPED_BY_SINGLE_STEP)) | |
9f3a5c85 | 3345 | || (gdb_breakpoint_here (event_child->stop_pc) |
d3ce09f5 | 3346 | && gdb_condition_true_at_breakpoint (event_child->stop_pc) |
de0d863e | 3347 | && gdb_no_commands_at_breakpoint (event_child->stop_pc)) |
183be222 | 3348 | || event_child->waitstatus.kind () != TARGET_WAITKIND_IGNORE); |
d3ce09f5 SS |
3349 | |
3350 | run_breakpoint_commands (event_child->stop_pc); | |
6bf5e0ba PA |
3351 | |
3352 | /* We found no reason GDB would want us to stop. We either hit one | |
3353 | of our own breakpoints, or finished an internal step GDB | |
3354 | shouldn't know about. */ | |
3355 | if (!report_to_gdb) | |
3356 | { | |
c058728c SM |
3357 | if (bp_explains_trap) |
3358 | threads_debug_printf ("Hit a gdbserver breakpoint."); | |
3359 | ||
3360 | if (step_over_finished) | |
3361 | threads_debug_printf ("Step-over finished."); | |
3362 | ||
3363 | if (trace_event) | |
3364 | threads_debug_printf ("Tracepoint event."); | |
3365 | ||
3366 | if (lwp_in_step_range (event_child)) | |
3367 | threads_debug_printf ("Range stepping pc 0x%s [0x%s, 0x%s).", | |
3368 | paddress (event_child->stop_pc), | |
3369 | paddress (event_child->step_range_start), | |
3370 | paddress (event_child->step_range_end)); | |
6bf5e0ba PA |
3371 | |
3372 | /* We're not reporting this breakpoint to GDB, so apply the | |
3373 | decr_pc_after_break adjustment to the inferior's regcache | |
3374 | ourselves. */ | |
3375 | ||
bf9ae9d8 | 3376 | if (low_supports_breakpoints ()) |
6bf5e0ba PA |
3377 | { |
3378 | struct regcache *regcache | |
0bfdf32f | 3379 | = get_thread_regcache (current_thread, 1); |
bf9ae9d8 | 3380 | low_set_pc (regcache, event_child->stop_pc); |
6bf5e0ba PA |
3381 | } |
3382 | ||
7984d532 | 3383 | if (step_over_finished) |
e3652c84 YQ |
3384 | { |
3385 | /* If we have finished stepping over a breakpoint, we've | |
3386 | stopped and suspended all LWPs momentarily except the | |
3387 | stepping one. This is where we resume them all again. | |
3388 | We're going to keep waiting, so use proceed, which | |
3389 | handles stepping over the next breakpoint. */ | |
3390 | unsuspend_all_lwps (event_child); | |
3391 | } | |
3392 | else | |
3393 | { | |
3394 | /* Remove the single-step breakpoints if any. Note that | |
3395 | there isn't single-step breakpoint if we finished stepping | |
3396 | over. */ | |
7582c77c | 3397 | if (supports_software_single_step () |
e3652c84 YQ |
3398 | && has_single_step_breakpoints (current_thread)) |
3399 | { | |
3400 | stop_all_lwps (0, event_child); | |
3401 | delete_single_step_breakpoints (current_thread); | |
3402 | unstop_all_lwps (0, event_child); | |
3403 | } | |
3404 | } | |
7984d532 | 3405 | |
c058728c | 3406 | threads_debug_printf ("proceeding all threads."); |
edeeb602 | 3407 | |
c058728c | 3408 | proceed_all_lwps (); |
edeeb602 | 3409 | |
582511be | 3410 | return ignore_event (ourstatus); |
6bf5e0ba PA |
3411 | } |
3412 | ||
c058728c SM |
3413 | if (debug_threads) |
3414 | { | |
3415 | if (event_child->waitstatus.kind () != TARGET_WAITKIND_IGNORE) | |
3416 | threads_debug_printf ("LWP %ld: extended event with waitstatus %s", | |
3417 | lwpid_of (get_lwp_thread (event_child)), | |
3418 | event_child->waitstatus.to_string ().c_str ()); | |
3419 | ||
3420 | if (current_thread->last_resume_kind == resume_step) | |
3421 | { | |
3422 | if (event_child->step_range_start == event_child->step_range_end) | |
3423 | threads_debug_printf | |
3424 | ("GDB wanted to single-step, reporting event."); | |
3425 | else if (!lwp_in_step_range (event_child)) | |
3426 | threads_debug_printf ("Out of step range, reporting event."); | |
3427 | } | |
3428 | ||
3429 | if (event_child->stop_reason == TARGET_STOPPED_BY_WATCHPOINT) | |
3430 | threads_debug_printf ("Stopped by watchpoint."); | |
3431 | else if (gdb_breakpoint_here (event_child->stop_pc)) | |
3432 | threads_debug_printf ("Stopped by GDB breakpoint."); | |
3433 | } | |
3434 | ||
3435 | threads_debug_printf ("Hit a non-gdbserver trap event."); | |
6bf5e0ba PA |
3436 | |
3437 | /* Alright, we're going to report a stop. */ | |
3438 | ||
3b9a79ef | 3439 | /* Remove single-step breakpoints. */ |
7582c77c | 3440 | if (supports_software_single_step ()) |
8901d193 | 3441 | { |
3b9a79ef | 3442 | /* Remove single-step breakpoints or not. It it is true, stop all |
8901d193 YQ |
3443 | lwps, so that other threads won't hit the breakpoint in the |
3444 | staled memory. */ | |
3b9a79ef | 3445 | int remove_single_step_breakpoints_p = 0; |
8901d193 YQ |
3446 | |
3447 | if (non_stop) | |
3448 | { | |
3b9a79ef YQ |
3449 | remove_single_step_breakpoints_p |
3450 | = has_single_step_breakpoints (current_thread); | |
8901d193 YQ |
3451 | } |
3452 | else | |
3453 | { | |
3454 | /* In all-stop, a stop reply cancels all previous resume | |
3b9a79ef | 3455 | requests. Delete all single-step breakpoints. */ |
8901d193 | 3456 | |
9c80ecd6 SM |
3457 | find_thread ([&] (thread_info *thread) { |
3458 | if (has_single_step_breakpoints (thread)) | |
3459 | { | |
3460 | remove_single_step_breakpoints_p = 1; | |
3461 | return true; | |
3462 | } | |
8901d193 | 3463 | |
9c80ecd6 SM |
3464 | return false; |
3465 | }); | |
8901d193 YQ |
3466 | } |
3467 | ||
3b9a79ef | 3468 | if (remove_single_step_breakpoints_p) |
8901d193 | 3469 | { |
3b9a79ef | 3470 | /* If we remove single-step breakpoints from memory, stop all lwps, |
8901d193 YQ |
3471 | so that other threads won't hit the breakpoint in the staled |
3472 | memory. */ | |
3473 | stop_all_lwps (0, event_child); | |
3474 | ||
3475 | if (non_stop) | |
3476 | { | |
3b9a79ef YQ |
3477 | gdb_assert (has_single_step_breakpoints (current_thread)); |
3478 | delete_single_step_breakpoints (current_thread); | |
8901d193 YQ |
3479 | } |
3480 | else | |
3481 | { | |
9c80ecd6 SM |
3482 | for_each_thread ([] (thread_info *thread){ |
3483 | if (has_single_step_breakpoints (thread)) | |
3484 | delete_single_step_breakpoints (thread); | |
3485 | }); | |
8901d193 YQ |
3486 | } |
3487 | ||
3488 | unstop_all_lwps (0, event_child); | |
3489 | } | |
3490 | } | |
3491 | ||
582511be | 3492 | if (!stabilizing_threads) |
6bf5e0ba PA |
3493 | { |
3494 | /* In all-stop, stop all threads. */ | |
582511be PA |
3495 | if (!non_stop) |
3496 | stop_all_lwps (0, NULL); | |
6bf5e0ba | 3497 | |
c03e6ccc | 3498 | if (step_over_finished) |
582511be PA |
3499 | { |
3500 | if (!non_stop) | |
3501 | { | |
3502 | /* If we were doing a step-over, all other threads but | |
3503 | the stepping one had been paused in start_step_over, | |
3504 | with their suspend counts incremented. We don't want | |
3505 | to do a full unstop/unpause, because we're in | |
3506 | all-stop mode (so we want threads stopped), but we | |
3507 | still need to unsuspend the other threads, to | |
3508 | decrement their `suspended' count back. */ | |
3509 | unsuspend_all_lwps (event_child); | |
3510 | } | |
3511 | else | |
3512 | { | |
3513 | /* If we just finished a step-over, then all threads had | |
3514 | been momentarily paused. In all-stop, that's fine, | |
3515 | we want threads stopped by now anyway. In non-stop, | |
3516 | we need to re-resume threads that GDB wanted to be | |
3517 | running. */ | |
3518 | unstop_all_lwps (1, event_child); | |
3519 | } | |
3520 | } | |
c03e6ccc | 3521 | |
3aa5cfa0 AT |
3522 | /* If we're not waiting for a specific LWP, choose an event LWP |
3523 | from among those that have had events. Giving equal priority | |
3524 | to all LWPs that have had events helps prevent | |
3525 | starvation. */ | |
d7e15655 | 3526 | if (ptid == minus_one_ptid) |
3aa5cfa0 AT |
3527 | { |
3528 | event_child->status_pending_p = 1; | |
3529 | event_child->status_pending = w; | |
3530 | ||
3531 | select_event_lwp (&event_child); | |
3532 | ||
3533 | /* current_thread and event_child must stay in sync. */ | |
24583e45 | 3534 | switch_to_thread (get_lwp_thread (event_child)); |
3aa5cfa0 AT |
3535 | |
3536 | event_child->status_pending_p = 0; | |
3537 | w = event_child->status_pending; | |
3538 | } | |
3539 | ||
3540 | ||
fa593d66 | 3541 | /* Stabilize threads (move out of jump pads). */ |
582511be | 3542 | if (!non_stop) |
5c9eb2f2 | 3543 | target_stabilize_threads (); |
6bf5e0ba PA |
3544 | } |
3545 | else | |
3546 | { | |
3547 | /* If we just finished a step-over, then all threads had been | |
3548 | momentarily paused. In all-stop, that's fine, we want | |
3549 | threads stopped by now anyway. In non-stop, we need to | |
3550 | re-resume threads that GDB wanted to be running. */ | |
3551 | if (step_over_finished) | |
7984d532 | 3552 | unstop_all_lwps (1, event_child); |
6bf5e0ba PA |
3553 | } |
3554 | ||
e88cf517 SM |
3555 | /* At this point, we haven't set OURSTATUS. This is where we do it. */ |
3556 | gdb_assert (ourstatus->kind () == TARGET_WAITKIND_IGNORE); | |
3557 | ||
183be222 | 3558 | if (event_child->waitstatus.kind () != TARGET_WAITKIND_IGNORE) |
de0d863e | 3559 | { |
393a6b59 PA |
3560 | /* If the reported event is an exit, fork, vfork, clone or exec, |
3561 | let GDB know. */ | |
5a04c4cf | 3562 | |
393a6b59 PA |
3563 | /* Break the unreported fork/vfork/clone relationship chain. */ |
3564 | if (is_new_child_status (event_child->waitstatus.kind ())) | |
5a04c4cf | 3565 | { |
393a6b59 PA |
3566 | event_child->relative->relative = NULL; |
3567 | event_child->relative = NULL; | |
5a04c4cf PA |
3568 | } |
3569 | ||
00db26fa | 3570 | *ourstatus = event_child->waitstatus; |
de0d863e | 3571 | /* Clear the event lwp's waitstatus since we handled it already. */ |
183be222 | 3572 | event_child->waitstatus.set_ignore (); |
de0d863e DB |
3573 | } |
3574 | else | |
183be222 | 3575 | { |
e88cf517 | 3576 | /* The LWP stopped due to a plain signal or a syscall signal. Either way, |
3bfdcabb | 3577 | event_child->waitstatus wasn't filled in with the details, so look at |
e88cf517 SM |
3578 | the wait status W. */ |
3579 | if (WSTOPSIG (w) == SYSCALL_SIGTRAP) | |
3580 | { | |
3581 | int syscall_number; | |
3582 | ||
3583 | get_syscall_trapinfo (event_child, &syscall_number); | |
3584 | if (event_child->syscall_state == TARGET_WAITKIND_SYSCALL_ENTRY) | |
3585 | ourstatus->set_syscall_entry (syscall_number); | |
3586 | else if (event_child->syscall_state == TARGET_WAITKIND_SYSCALL_RETURN) | |
3587 | ourstatus->set_syscall_return (syscall_number); | |
3588 | else | |
3589 | gdb_assert_not_reached ("unexpected syscall state"); | |
3590 | } | |
3591 | else if (current_thread->last_resume_kind == resume_stop | |
3592 | && WSTOPSIG (w) == SIGSTOP) | |
3593 | { | |
3594 | /* A thread that has been requested to stop by GDB with vCont;t, | |
3595 | and it stopped cleanly, so report as SIG0. The use of | |
3596 | SIGSTOP is an implementation detail. */ | |
3597 | ourstatus->set_stopped (GDB_SIGNAL_0); | |
3598 | } | |
3599 | else | |
3600 | ourstatus->set_stopped (gdb_signal_from_host (WSTOPSIG (w))); | |
183be222 | 3601 | } |
5b1c542e | 3602 | |
582511be | 3603 | /* Now that we've selected our final event LWP, un-adjust its PC if |
3e572f71 PA |
3604 | it was a software breakpoint, and the client doesn't know we can |
3605 | adjust the breakpoint ourselves. */ | |
3606 | if (event_child->stop_reason == TARGET_STOPPED_BY_SW_BREAKPOINT | |
c12a5089 | 3607 | && !cs.swbreak_feature) |
582511be | 3608 | { |
d4807ea2 | 3609 | int decr_pc = low_decr_pc_after_break (); |
582511be PA |
3610 | |
3611 | if (decr_pc != 0) | |
3612 | { | |
3613 | struct regcache *regcache | |
3614 | = get_thread_regcache (current_thread, 1); | |
bf9ae9d8 | 3615 | low_set_pc (regcache, event_child->stop_pc + decr_pc); |
582511be PA |
3616 | } |
3617 | } | |
3618 | ||
d7e15655 | 3619 | gdb_assert (step_over_bkpt == null_ptid); |
d50171e4 | 3620 | |
e48359ea | 3621 | threads_debug_printf ("ret = %s, %s", |
c058728c | 3622 | target_pid_to_str (ptid_of (current_thread)).c_str (), |
e48359ea | 3623 | ourstatus->to_string ().c_str ()); |
bd99dc85 | 3624 | |
48989498 | 3625 | return filter_exit_event (event_child, ourstatus); |
bd99dc85 PA |
3626 | } |
3627 | ||
3628 | /* Get rid of any pending event in the pipe. */ | |
3629 | static void | |
3630 | async_file_flush (void) | |
3631 | { | |
cdc8e9b2 | 3632 | linux_event_pipe.flush (); |
bd99dc85 PA |
3633 | } |
3634 | ||
3635 | /* Put something in the pipe, so the event loop wakes up. */ | |
3636 | static void | |
3637 | async_file_mark (void) | |
3638 | { | |
cdc8e9b2 | 3639 | linux_event_pipe.mark (); |
bd99dc85 PA |
3640 | } |
3641 | ||
6532e7e3 TBA |
3642 | ptid_t |
3643 | linux_process_target::wait (ptid_t ptid, | |
3644 | target_waitstatus *ourstatus, | |
b60cea74 | 3645 | target_wait_flags target_options) |
bd99dc85 | 3646 | { |
95954743 | 3647 | ptid_t event_ptid; |
bd99dc85 | 3648 | |
bd99dc85 PA |
3649 | /* Flush the async file first. */ |
3650 | if (target_is_async_p ()) | |
3651 | async_file_flush (); | |
3652 | ||
582511be PA |
3653 | do |
3654 | { | |
d16f3f6c | 3655 | event_ptid = wait_1 (ptid, ourstatus, target_options); |
582511be PA |
3656 | } |
3657 | while ((target_options & TARGET_WNOHANG) == 0 | |
183be222 | 3658 | && ourstatus->kind () == TARGET_WAITKIND_IGNORE); |
bd99dc85 PA |
3659 | |
3660 | /* If at least one stop was reported, there may be more. A single | |
3661 | SIGCHLD can signal more than one child stop. */ | |
3662 | if (target_is_async_p () | |
3663 | && (target_options & TARGET_WNOHANG) != 0 | |
d7e15655 | 3664 | && event_ptid != null_ptid) |
bd99dc85 PA |
3665 | async_file_mark (); |
3666 | ||
3667 | return event_ptid; | |
da6d8c04 DJ |
3668 | } |
3669 | ||
c5f62d5f | 3670 | /* Send a signal to an LWP. */ |
fd500816 DJ |
3671 | |
3672 | static int | |
a1928bad | 3673 | kill_lwp (unsigned long lwpid, int signo) |
fd500816 | 3674 | { |
4a6ed09b | 3675 | int ret; |
fd500816 | 3676 | |
4a6ed09b PA |
3677 | errno = 0; |
3678 | ret = syscall (__NR_tkill, lwpid, signo); | |
3679 | if (errno == ENOSYS) | |
3680 | { | |
3681 | /* If tkill fails, then we are not using nptl threads, a | |
3682 | configuration we no longer support. */ | |
3683 | perror_with_name (("tkill")); | |
3684 | } | |
3685 | return ret; | |
fd500816 DJ |
3686 | } |
3687 | ||
964e4306 PA |
3688 | void |
3689 | linux_stop_lwp (struct lwp_info *lwp) | |
3690 | { | |
3691 | send_sigstop (lwp); | |
3692 | } | |
3693 | ||
0d62e5e8 | 3694 | static void |
02fc4de7 | 3695 | send_sigstop (struct lwp_info *lwp) |
0d62e5e8 | 3696 | { |
bd99dc85 | 3697 | int pid; |
0d62e5e8 | 3698 | |
d86d4aaf | 3699 | pid = lwpid_of (get_lwp_thread (lwp)); |
bd99dc85 | 3700 | |
0d62e5e8 DJ |
3701 | /* If we already have a pending stop signal for this process, don't |
3702 | send another. */ | |
54a0b537 | 3703 | if (lwp->stop_expected) |
0d62e5e8 | 3704 | { |
c058728c | 3705 | threads_debug_printf ("Have pending sigstop for lwp %d", pid); |
ae13219e | 3706 | |
0d62e5e8 DJ |
3707 | return; |
3708 | } | |
3709 | ||
c058728c | 3710 | threads_debug_printf ("Sending sigstop to lwp %d", pid); |
0d62e5e8 | 3711 | |
d50171e4 | 3712 | lwp->stop_expected = 1; |
bd99dc85 | 3713 | kill_lwp (pid, SIGSTOP); |
0d62e5e8 DJ |
3714 | } |
3715 | ||
df3e4dbe SM |
3716 | static void |
3717 | send_sigstop (thread_info *thread, lwp_info *except) | |
02fc4de7 | 3718 | { |
d86d4aaf | 3719 | struct lwp_info *lwp = get_thread_lwp (thread); |
02fc4de7 | 3720 | |
7984d532 PA |
3721 | /* Ignore EXCEPT. */ |
3722 | if (lwp == except) | |
df3e4dbe | 3723 | return; |
7984d532 | 3724 | |
02fc4de7 | 3725 | if (lwp->stopped) |
df3e4dbe | 3726 | return; |
02fc4de7 PA |
3727 | |
3728 | send_sigstop (lwp); | |
7984d532 PA |
3729 | } |
3730 | ||
3731 | /* Increment the suspend count of an LWP, and stop it, if not stopped | |
3732 | yet. */ | |
df3e4dbe SM |
3733 | static void |
3734 | suspend_and_send_sigstop (thread_info *thread, lwp_info *except) | |
7984d532 | 3735 | { |
d86d4aaf | 3736 | struct lwp_info *lwp = get_thread_lwp (thread); |
7984d532 PA |
3737 | |
3738 | /* Ignore EXCEPT. */ | |
3739 | if (lwp == except) | |
df3e4dbe | 3740 | return; |
7984d532 | 3741 | |
863d01bd | 3742 | lwp_suspended_inc (lwp); |
7984d532 | 3743 | |
df3e4dbe | 3744 | send_sigstop (thread, except); |
02fc4de7 PA |
3745 | } |
3746 | ||
95954743 PA |
3747 | static void |
3748 | mark_lwp_dead (struct lwp_info *lwp, int wstat) | |
3749 | { | |
95954743 PA |
3750 | /* Store the exit status for later. */ |
3751 | lwp->status_pending_p = 1; | |
3752 | lwp->status_pending = wstat; | |
3753 | ||
00db26fa PA |
3754 | /* Store in waitstatus as well, as there's nothing else to process |
3755 | for this event. */ | |
3756 | if (WIFEXITED (wstat)) | |
183be222 | 3757 | lwp->waitstatus.set_exited (WEXITSTATUS (wstat)); |
00db26fa | 3758 | else if (WIFSIGNALED (wstat)) |
183be222 | 3759 | lwp->waitstatus.set_signalled (gdb_signal_from_host (WTERMSIG (wstat))); |
00db26fa | 3760 | |
95954743 PA |
3761 | /* Prevent trying to stop it. */ |
3762 | lwp->stopped = 1; | |
3763 | ||
3764 | /* No further stops are expected from a dead lwp. */ | |
3765 | lwp->stop_expected = 0; | |
3766 | } | |
3767 | ||
00db26fa PA |
3768 | /* Return true if LWP has exited already, and has a pending exit event |
3769 | to report to GDB. */ | |
3770 | ||
3771 | static int | |
3772 | lwp_is_marked_dead (struct lwp_info *lwp) | |
3773 | { | |
3774 | return (lwp->status_pending_p | |
3775 | && (WIFEXITED (lwp->status_pending) | |
3776 | || WIFSIGNALED (lwp->status_pending))); | |
3777 | } | |
3778 | ||
d16f3f6c TBA |
3779 | void |
3780 | linux_process_target::wait_for_sigstop () | |
0d62e5e8 | 3781 | { |
0bfdf32f | 3782 | struct thread_info *saved_thread; |
95954743 | 3783 | ptid_t saved_tid; |
fa96cb38 PA |
3784 | int wstat; |
3785 | int ret; | |
0d62e5e8 | 3786 | |
0bfdf32f GB |
3787 | saved_thread = current_thread; |
3788 | if (saved_thread != NULL) | |
9c80ecd6 | 3789 | saved_tid = saved_thread->id; |
bd99dc85 | 3790 | else |
95954743 | 3791 | saved_tid = null_ptid; /* avoid bogus unused warning */ |
bd99dc85 | 3792 | |
20ac1cdb TBA |
3793 | scoped_restore_current_thread restore_thread; |
3794 | ||
c058728c | 3795 | threads_debug_printf ("pulling events"); |
d50171e4 | 3796 | |
fa96cb38 PA |
3797 | /* Passing NULL_PTID as filter indicates we want all events to be |
3798 | left pending. Eventually this returns when there are no | |
3799 | unwaited-for children left. */ | |
d16f3f6c | 3800 | ret = wait_for_event_filtered (minus_one_ptid, null_ptid, &wstat, __WALL); |
fa96cb38 | 3801 | gdb_assert (ret == -1); |
0d62e5e8 | 3802 | |
13d3d99b | 3803 | if (saved_thread == NULL || mythread_alive (saved_tid)) |
20ac1cdb | 3804 | return; |
0d62e5e8 DJ |
3805 | else |
3806 | { | |
c058728c | 3807 | threads_debug_printf ("Previously current thread died."); |
0d62e5e8 | 3808 | |
f0db101d PA |
3809 | /* We can't change the current inferior behind GDB's back, |
3810 | otherwise, a subsequent command may apply to the wrong | |
3811 | process. */ | |
20ac1cdb TBA |
3812 | restore_thread.dont_restore (); |
3813 | switch_to_thread (nullptr); | |
0d62e5e8 DJ |
3814 | } |
3815 | } | |
3816 | ||
13e567af TBA |
3817 | bool |
3818 | linux_process_target::stuck_in_jump_pad (thread_info *thread) | |
fa593d66 | 3819 | { |
d86d4aaf | 3820 | struct lwp_info *lwp = get_thread_lwp (thread); |
fa593d66 | 3821 | |
863d01bd PA |
3822 | if (lwp->suspended != 0) |
3823 | { | |
f34652de | 3824 | internal_error ("LWP %ld is suspended, suspended=%d\n", |
863d01bd PA |
3825 | lwpid_of (thread), lwp->suspended); |
3826 | } | |
fa593d66 PA |
3827 | gdb_assert (lwp->stopped); |
3828 | ||
3829 | /* Allow debugging the jump pad, gdb_collect, etc.. */ | |
3830 | return (supports_fast_tracepoints () | |
58b4daa5 | 3831 | && agent_loaded_p () |
fa593d66 | 3832 | && (gdb_breakpoint_here (lwp->stop_pc) |
15c66dd6 | 3833 | || lwp->stop_reason == TARGET_STOPPED_BY_WATCHPOINT |
fa593d66 | 3834 | || thread->last_resume_kind == resume_step) |
229d26fc SM |
3835 | && (linux_fast_tracepoint_collecting (lwp, NULL) |
3836 | != fast_tpoint_collect_result::not_collecting)); | |
fa593d66 PA |
3837 | } |
3838 | ||
d16f3f6c TBA |
3839 | void |
3840 | linux_process_target::move_out_of_jump_pad (thread_info *thread) | |
fa593d66 | 3841 | { |
d86d4aaf | 3842 | struct lwp_info *lwp = get_thread_lwp (thread); |
fa593d66 PA |
3843 | int *wstat; |
3844 | ||
863d01bd PA |
3845 | if (lwp->suspended != 0) |
3846 | { | |
f34652de | 3847 | internal_error ("LWP %ld is suspended, suspended=%d\n", |
863d01bd PA |
3848 | lwpid_of (thread), lwp->suspended); |
3849 | } | |
fa593d66 PA |
3850 | gdb_assert (lwp->stopped); |
3851 | ||
f0ce0d3a | 3852 | /* For gdb_breakpoint_here. */ |
24583e45 TBA |
3853 | scoped_restore_current_thread restore_thread; |
3854 | switch_to_thread (thread); | |
f0ce0d3a | 3855 | |
fa593d66 PA |
3856 | wstat = lwp->status_pending_p ? &lwp->status_pending : NULL; |
3857 | ||
3858 | /* Allow debugging the jump pad, gdb_collect, etc. */ | |
3859 | if (!gdb_breakpoint_here (lwp->stop_pc) | |
15c66dd6 | 3860 | && lwp->stop_reason != TARGET_STOPPED_BY_WATCHPOINT |
fa593d66 PA |
3861 | && thread->last_resume_kind != resume_step |
3862 | && maybe_move_out_of_jump_pad (lwp, wstat)) | |
3863 | { | |
c058728c SM |
3864 | threads_debug_printf ("LWP %ld needs stabilizing (in jump pad)", |
3865 | lwpid_of (thread)); | |
fa593d66 PA |
3866 | |
3867 | if (wstat) | |
3868 | { | |
3869 | lwp->status_pending_p = 0; | |
3870 | enqueue_one_deferred_signal (lwp, wstat); | |
3871 | ||
c058728c SM |
3872 | threads_debug_printf ("Signal %d for LWP %ld deferred (in jump pad", |
3873 | WSTOPSIG (*wstat), lwpid_of (thread)); | |
fa593d66 PA |
3874 | } |
3875 | ||
df95181f | 3876 | resume_one_lwp (lwp, 0, 0, NULL); |
fa593d66 PA |
3877 | } |
3878 | else | |
863d01bd | 3879 | lwp_suspended_inc (lwp); |
fa593d66 PA |
3880 | } |
3881 | ||
5a6b0a41 SM |
3882 | static bool |
3883 | lwp_running (thread_info *thread) | |
fa593d66 | 3884 | { |
d86d4aaf | 3885 | struct lwp_info *lwp = get_thread_lwp (thread); |
fa593d66 | 3886 | |
00db26fa | 3887 | if (lwp_is_marked_dead (lwp)) |
5a6b0a41 SM |
3888 | return false; |
3889 | ||
3890 | return !lwp->stopped; | |
fa593d66 PA |
3891 | } |
3892 | ||
d16f3f6c TBA |
3893 | void |
3894 | linux_process_target::stop_all_lwps (int suspend, lwp_info *except) | |
0d62e5e8 | 3895 | { |
bde24c0a PA |
3896 | /* Should not be called recursively. */ |
3897 | gdb_assert (stopping_threads == NOT_STOPPING_THREADS); | |
3898 | ||
c058728c SM |
3899 | THREADS_SCOPED_DEBUG_ENTER_EXIT; |
3900 | ||
3901 | threads_debug_printf | |
3902 | ("%s, except=%s", suspend ? "stop-and-suspend" : "stop", | |
3903 | (except != NULL | |
3904 | ? target_pid_to_str (ptid_of (get_lwp_thread (except))).c_str () | |
3905 | : "none")); | |
87ce2a04 | 3906 | |
bde24c0a PA |
3907 | stopping_threads = (suspend |
3908 | ? STOPPING_AND_SUSPENDING_THREADS | |
3909 | : STOPPING_THREADS); | |
7984d532 PA |
3910 | |
3911 | if (suspend) | |
df3e4dbe SM |
3912 | for_each_thread ([&] (thread_info *thread) |
3913 | { | |
3914 | suspend_and_send_sigstop (thread, except); | |
3915 | }); | |
7984d532 | 3916 | else |
df3e4dbe SM |
3917 | for_each_thread ([&] (thread_info *thread) |
3918 | { | |
3919 | send_sigstop (thread, except); | |
3920 | }); | |
3921 | ||
fa96cb38 | 3922 | wait_for_sigstop (); |
bde24c0a | 3923 | stopping_threads = NOT_STOPPING_THREADS; |
87ce2a04 | 3924 | |
c058728c | 3925 | threads_debug_printf ("setting stopping_threads back to !stopping"); |
0d62e5e8 DJ |
3926 | } |
3927 | ||
863d01bd PA |
3928 | /* Enqueue one signal in the chain of signals which need to be |
3929 | delivered to this process on next resume. */ | |
3930 | ||
3931 | static void | |
3932 | enqueue_pending_signal (struct lwp_info *lwp, int signal, siginfo_t *info) | |
3933 | { | |
013e3554 TBA |
3934 | lwp->pending_signals.emplace_back (signal); |
3935 | if (info == nullptr) | |
3936 | memset (&lwp->pending_signals.back ().info, 0, sizeof (siginfo_t)); | |
863d01bd | 3937 | else |
013e3554 | 3938 | lwp->pending_signals.back ().info = *info; |
863d01bd PA |
3939 | } |
3940 | ||
df95181f TBA |
3941 | void |
3942 | linux_process_target::install_software_single_step_breakpoints (lwp_info *lwp) | |
fa5308bd | 3943 | { |
984a2c04 YQ |
3944 | struct thread_info *thread = get_lwp_thread (lwp); |
3945 | struct regcache *regcache = get_thread_regcache (thread, 1); | |
8ce47547 | 3946 | |
24583e45 | 3947 | scoped_restore_current_thread restore_thread; |
984a2c04 | 3948 | |
24583e45 | 3949 | switch_to_thread (thread); |
7582c77c | 3950 | std::vector<CORE_ADDR> next_pcs = low_get_next_pcs (regcache); |
fa5308bd | 3951 | |
a0ff9e1a | 3952 | for (CORE_ADDR pc : next_pcs) |
3b9a79ef | 3953 | set_single_step_breakpoint (pc, current_ptid); |
fa5308bd AT |
3954 | } |
3955 | ||
df95181f TBA |
3956 | int |
3957 | linux_process_target::single_step (lwp_info* lwp) | |
7fe5e27e AT |
3958 | { |
3959 | int step = 0; | |
3960 | ||
b31cdfa6 | 3961 | if (supports_hardware_single_step ()) |
7fe5e27e AT |
3962 | { |
3963 | step = 1; | |
3964 | } | |
7582c77c | 3965 | else if (supports_software_single_step ()) |
7fe5e27e AT |
3966 | { |
3967 | install_software_single_step_breakpoints (lwp); | |
3968 | step = 0; | |
3969 | } | |
3970 | else | |
c058728c | 3971 | threads_debug_printf ("stepping is not implemented on this target"); |
7fe5e27e AT |
3972 | |
3973 | return step; | |
3974 | } | |
3975 | ||
35ac8b3e | 3976 | /* The signal can be delivered to the inferior if we are not trying to |
5b061e98 YQ |
3977 | finish a fast tracepoint collect. Since signal can be delivered in |
3978 | the step-over, the program may go to signal handler and trap again | |
3979 | after return from the signal handler. We can live with the spurious | |
3980 | double traps. */ | |
35ac8b3e YQ |
3981 | |
3982 | static int | |
3983 | lwp_signal_can_be_delivered (struct lwp_info *lwp) | |
3984 | { | |
229d26fc SM |
3985 | return (lwp->collecting_fast_tracepoint |
3986 | == fast_tpoint_collect_result::not_collecting); | |
35ac8b3e YQ |
3987 | } |
3988 | ||
df95181f TBA |
3989 | void |
3990 | linux_process_target::resume_one_lwp_throw (lwp_info *lwp, int step, | |
3991 | int signal, siginfo_t *info) | |
da6d8c04 | 3992 | { |
d86d4aaf | 3993 | struct thread_info *thread = get_lwp_thread (lwp); |
82075af2 | 3994 | int ptrace_request; |
c06cbd92 YQ |
3995 | struct process_info *proc = get_thread_process (thread); |
3996 | ||
3997 | /* Note that target description may not be initialised | |
3998 | (proc->tdesc == NULL) at this point because the program hasn't | |
3999 | stopped at the first instruction yet. It means GDBserver skips | |
4000 | the extra traps from the wrapper program (see option --wrapper). | |
4001 | Code in this function that requires register access should be | |
4002 | guarded by proc->tdesc == NULL or something else. */ | |
0d62e5e8 | 4003 | |
54a0b537 | 4004 | if (lwp->stopped == 0) |
0d62e5e8 DJ |
4005 | return; |
4006 | ||
183be222 | 4007 | gdb_assert (lwp->waitstatus.kind () == TARGET_WAITKIND_IGNORE); |
65706a29 | 4008 | |
229d26fc SM |
4009 | fast_tpoint_collect_result fast_tp_collecting |
4010 | = lwp->collecting_fast_tracepoint; | |
fa593d66 | 4011 | |
229d26fc SM |
4012 | gdb_assert (!stabilizing_threads |
4013 | || (fast_tp_collecting | |
4014 | != fast_tpoint_collect_result::not_collecting)); | |
fa593d66 | 4015 | |
219f2f23 PA |
4016 | /* Cancel actions that rely on GDB not changing the PC (e.g., the |
4017 | user used the "jump" command, or "set $pc = foo"). */ | |
c06cbd92 | 4018 | if (thread->while_stepping != NULL && lwp->stop_pc != get_pc (lwp)) |
219f2f23 PA |
4019 | { |
4020 | /* Collecting 'while-stepping' actions doesn't make sense | |
4021 | anymore. */ | |
d86d4aaf | 4022 | release_while_stepping_state_list (thread); |
219f2f23 PA |
4023 | } |
4024 | ||
0d62e5e8 | 4025 | /* If we have pending signals or status, and a new signal, enqueue the |
35ac8b3e YQ |
4026 | signal. Also enqueue the signal if it can't be delivered to the |
4027 | inferior right now. */ | |
0d62e5e8 | 4028 | if (signal != 0 |
fa593d66 | 4029 | && (lwp->status_pending_p |
013e3554 | 4030 | || !lwp->pending_signals.empty () |
35ac8b3e | 4031 | || !lwp_signal_can_be_delivered (lwp))) |
94610ec4 YQ |
4032 | { |
4033 | enqueue_pending_signal (lwp, signal, info); | |
4034 | ||
4035 | /* Postpone any pending signal. It was enqueued above. */ | |
4036 | signal = 0; | |
4037 | } | |
0d62e5e8 | 4038 | |
d50171e4 PA |
4039 | if (lwp->status_pending_p) |
4040 | { | |
c058728c SM |
4041 | threads_debug_printf |
4042 | ("Not resuming lwp %ld (%s, stop %s); has pending status", | |
4043 | lwpid_of (thread), step ? "step" : "continue", | |
4044 | lwp->stop_expected ? "expected" : "not expected"); | |
d50171e4 PA |
4045 | return; |
4046 | } | |
0d62e5e8 | 4047 | |
24583e45 TBA |
4048 | scoped_restore_current_thread restore_thread; |
4049 | switch_to_thread (thread); | |
0d62e5e8 | 4050 | |
0d62e5e8 DJ |
4051 | /* This bit needs some thinking about. If we get a signal that |
4052 | we must report while a single-step reinsert is still pending, | |
4053 | we often end up resuming the thread. It might be better to | |
4054 | (ew) allow a stack of pending events; then we could be sure that | |
4055 | the reinsert happened right away and not lose any signals. | |
4056 | ||
4057 | Making this stack would also shrink the window in which breakpoints are | |
54a0b537 | 4058 | uninserted (see comment in linux_wait_for_lwp) but not enough for |
0d62e5e8 DJ |
4059 | complete correctness, so it won't solve that problem. It may be |
4060 | worthwhile just to solve this one, however. */ | |
54a0b537 | 4061 | if (lwp->bp_reinsert != 0) |
0d62e5e8 | 4062 | { |
c058728c SM |
4063 | threads_debug_printf (" pending reinsert at 0x%s", |
4064 | paddress (lwp->bp_reinsert)); | |
d50171e4 | 4065 | |
b31cdfa6 | 4066 | if (supports_hardware_single_step ()) |
d50171e4 | 4067 | { |
229d26fc | 4068 | if (fast_tp_collecting == fast_tpoint_collect_result::not_collecting) |
fa593d66 PA |
4069 | { |
4070 | if (step == 0) | |
9986ba08 | 4071 | warning ("BAD - reinserting but not stepping."); |
fa593d66 | 4072 | if (lwp->suspended) |
9986ba08 PA |
4073 | warning ("BAD - reinserting and suspended(%d).", |
4074 | lwp->suspended); | |
fa593d66 | 4075 | } |
d50171e4 | 4076 | } |
f79b145d YQ |
4077 | |
4078 | step = maybe_hw_step (thread); | |
0d62e5e8 DJ |
4079 | } |
4080 | ||
229d26fc | 4081 | if (fast_tp_collecting == fast_tpoint_collect_result::before_insn) |
c058728c SM |
4082 | threads_debug_printf |
4083 | ("lwp %ld wants to get out of fast tracepoint jump pad " | |
4084 | "(exit-jump-pad-bkpt)", lwpid_of (thread)); | |
4085 | ||
229d26fc | 4086 | else if (fast_tp_collecting == fast_tpoint_collect_result::at_insn) |
fa593d66 | 4087 | { |
c058728c SM |
4088 | threads_debug_printf |
4089 | ("lwp %ld wants to get out of fast tracepoint jump pad single-stepping", | |
4090 | lwpid_of (thread)); | |
fa593d66 | 4091 | |
b31cdfa6 | 4092 | if (supports_hardware_single_step ()) |
fa593d66 PA |
4093 | step = 1; |
4094 | else | |
38e08fca | 4095 | { |
f34652de | 4096 | internal_error ("moving out of jump pad single-stepping" |
38e08fca GB |
4097 | " not implemented on this target"); |
4098 | } | |
fa593d66 PA |
4099 | } |
4100 | ||
219f2f23 PA |
4101 | /* If we have while-stepping actions in this thread set it stepping. |
4102 | If we have a signal to deliver, it may or may not be set to | |
4103 | SIG_IGN, we don't know. Assume so, and allow collecting | |
4104 | while-stepping into a signal handler. A possible smart thing to | |
4105 | do would be to set an internal breakpoint at the signal return | |
4106 | address, continue, and carry on catching this while-stepping | |
4107 | action only when that breakpoint is hit. A future | |
4108 | enhancement. */ | |
7fe5e27e | 4109 | if (thread->while_stepping != NULL) |
219f2f23 | 4110 | { |
c058728c SM |
4111 | threads_debug_printf |
4112 | ("lwp %ld has a while-stepping action -> forcing step.", | |
4113 | lwpid_of (thread)); | |
7fe5e27e AT |
4114 | |
4115 | step = single_step (lwp); | |
219f2f23 PA |
4116 | } |
4117 | ||
bf9ae9d8 | 4118 | if (proc->tdesc != NULL && low_supports_breakpoints ()) |
0d62e5e8 | 4119 | { |
0bfdf32f | 4120 | struct regcache *regcache = get_thread_regcache (current_thread, 1); |
582511be | 4121 | |
bf9ae9d8 | 4122 | lwp->stop_pc = low_get_pc (regcache); |
582511be | 4123 | |
c058728c SM |
4124 | threads_debug_printf (" %s from pc 0x%lx", step ? "step" : "continue", |
4125 | (long) lwp->stop_pc); | |
0d62e5e8 DJ |
4126 | } |
4127 | ||
35ac8b3e YQ |
4128 | /* If we have pending signals, consume one if it can be delivered to |
4129 | the inferior. */ | |
013e3554 | 4130 | if (!lwp->pending_signals.empty () && lwp_signal_can_be_delivered (lwp)) |
0d62e5e8 | 4131 | { |
013e3554 | 4132 | const pending_signal &p_sig = lwp->pending_signals.front (); |
0d62e5e8 | 4133 | |
013e3554 TBA |
4134 | signal = p_sig.signal; |
4135 | if (p_sig.info.si_signo != 0) | |
d86d4aaf | 4136 | ptrace (PTRACE_SETSIGINFO, lwpid_of (thread), (PTRACE_TYPE_ARG3) 0, |
013e3554 | 4137 | &p_sig.info); |
32ca6d61 | 4138 | |
013e3554 | 4139 | lwp->pending_signals.pop_front (); |
0d62e5e8 DJ |
4140 | } |
4141 | ||
c058728c SM |
4142 | threads_debug_printf ("Resuming lwp %ld (%s, signal %d, stop %s)", |
4143 | lwpid_of (thread), step ? "step" : "continue", signal, | |
4144 | lwp->stop_expected ? "expected" : "not expected"); | |
94610ec4 | 4145 | |
d7599cc0 | 4146 | low_prepare_to_resume (lwp); |
aa5ca48f | 4147 | |
d86d4aaf | 4148 | regcache_invalidate_thread (thread); |
da6d8c04 | 4149 | errno = 0; |
54a0b537 | 4150 | lwp->stepping = step; |
82075af2 JS |
4151 | if (step) |
4152 | ptrace_request = PTRACE_SINGLESTEP; | |
4153 | else if (gdb_catching_syscalls_p (lwp)) | |
4154 | ptrace_request = PTRACE_SYSCALL; | |
4155 | else | |
4156 | ptrace_request = PTRACE_CONT; | |
4157 | ptrace (ptrace_request, | |
4158 | lwpid_of (thread), | |
b8e1b30e | 4159 | (PTRACE_TYPE_ARG3) 0, |
14ce3065 DE |
4160 | /* Coerce to a uintptr_t first to avoid potential gcc warning |
4161 | of coercing an 8 byte integer to a 4 byte pointer. */ | |
b8e1b30e | 4162 | (PTRACE_TYPE_ARG4) (uintptr_t) signal); |
0d62e5e8 | 4163 | |
da6d8c04 | 4164 | if (errno) |
20471e00 SM |
4165 | { |
4166 | int saved_errno = errno; | |
4167 | ||
4168 | threads_debug_printf ("ptrace errno = %d (%s)", | |
4169 | saved_errno, strerror (saved_errno)); | |
4170 | ||
4171 | errno = saved_errno; | |
4172 | perror_with_name ("resuming thread"); | |
4173 | } | |
23f238d3 PA |
4174 | |
4175 | /* Successfully resumed. Clear state that no longer makes sense, | |
4176 | and mark the LWP as running. Must not do this before resuming | |
4177 | otherwise if that fails other code will be confused. E.g., we'd | |
4178 | later try to stop the LWP and hang forever waiting for a stop | |
4179 | status. Note that we must not throw after this is cleared, | |
4180 | otherwise handle_zombie_lwp_error would get confused. */ | |
4181 | lwp->stopped = 0; | |
4182 | lwp->stop_reason = TARGET_STOPPED_BY_NO_REASON; | |
4183 | } | |
4184 | ||
d7599cc0 TBA |
4185 | void |
4186 | linux_process_target::low_prepare_to_resume (lwp_info *lwp) | |
4187 | { | |
4188 | /* Nop. */ | |
4189 | } | |
4190 | ||
23f238d3 PA |
4191 | /* Called when we try to resume a stopped LWP and that errors out. If |
4192 | the LWP is no longer in ptrace-stopped state (meaning it's zombie, | |
4193 | or about to become), discard the error, clear any pending status | |
4194 | the LWP may have, and return true (we'll collect the exit status | |
4195 | soon enough). Otherwise, return false. */ | |
4196 | ||
4197 | static int | |
4198 | check_ptrace_stopped_lwp_gone (struct lwp_info *lp) | |
4199 | { | |
4200 | struct thread_info *thread = get_lwp_thread (lp); | |
4201 | ||
4202 | /* If we get an error after resuming the LWP successfully, we'd | |
4203 | confuse !T state for the LWP being gone. */ | |
4204 | gdb_assert (lp->stopped); | |
4205 | ||
4206 | /* We can't just check whether the LWP is in 'Z (Zombie)' state, | |
4207 | because even if ptrace failed with ESRCH, the tracee may be "not | |
4208 | yet fully dead", but already refusing ptrace requests. In that | |
4209 | case the tracee has 'R (Running)' state for a little bit | |
4210 | (observed in Linux 3.18). See also the note on ESRCH in the | |
4211 | ptrace(2) man page. Instead, check whether the LWP has any state | |
4212 | other than ptrace-stopped. */ | |
4213 | ||
4214 | /* Don't assume anything if /proc/PID/status can't be read. */ | |
4215 | if (linux_proc_pid_is_trace_stopped_nowarn (lwpid_of (thread)) == 0) | |
3221518c | 4216 | { |
23f238d3 PA |
4217 | lp->stop_reason = TARGET_STOPPED_BY_NO_REASON; |
4218 | lp->status_pending_p = 0; | |
4219 | return 1; | |
4220 | } | |
4221 | return 0; | |
4222 | } | |
4223 | ||
df95181f TBA |
4224 | void |
4225 | linux_process_target::resume_one_lwp (lwp_info *lwp, int step, int signal, | |
4226 | siginfo_t *info) | |
23f238d3 | 4227 | { |
a70b8144 | 4228 | try |
23f238d3 | 4229 | { |
df95181f | 4230 | resume_one_lwp_throw (lwp, step, signal, info); |
23f238d3 | 4231 | } |
230d2906 | 4232 | catch (const gdb_exception_error &ex) |
23f238d3 | 4233 | { |
20471e00 SM |
4234 | if (check_ptrace_stopped_lwp_gone (lwp)) |
4235 | { | |
4236 | /* This could because we tried to resume an LWP after its leader | |
4237 | exited. Mark it as resumed, so we can collect an exit event | |
4238 | from it. */ | |
4239 | lwp->stopped = 0; | |
4240 | lwp->stop_reason = TARGET_STOPPED_BY_NO_REASON; | |
4241 | } | |
4242 | else | |
eedc3f4f | 4243 | throw; |
3221518c | 4244 | } |
da6d8c04 DJ |
4245 | } |
4246 | ||
5fdda392 SM |
4247 | /* This function is called once per thread via for_each_thread. |
4248 | We look up which resume request applies to THREAD and mark it with a | |
4249 | pointer to the appropriate resume request. | |
5544ad89 DJ |
4250 | |
4251 | This algorithm is O(threads * resume elements), but resume elements | |
4252 | is small (and will remain small at least until GDB supports thread | |
4253 | suspension). */ | |
ebcf782c | 4254 | |
5fdda392 SM |
4255 | static void |
4256 | linux_set_resume_request (thread_info *thread, thread_resume *resume, size_t n) | |
0d62e5e8 | 4257 | { |
d86d4aaf | 4258 | struct lwp_info *lwp = get_thread_lwp (thread); |
64386c31 | 4259 | |
5fdda392 | 4260 | for (int ndx = 0; ndx < n; ndx++) |
95954743 | 4261 | { |
5fdda392 | 4262 | ptid_t ptid = resume[ndx].thread; |
d7e15655 | 4263 | if (ptid == minus_one_ptid |
9c80ecd6 | 4264 | || ptid == thread->id |
0c9070b3 YQ |
4265 | /* Handle both 'pPID' and 'pPID.-1' as meaning 'all threads |
4266 | of PID'. */ | |
e99b03dc | 4267 | || (ptid.pid () == pid_of (thread) |
0e998d96 | 4268 | && (ptid.is_pid () |
e38504b3 | 4269 | || ptid.lwp () == -1))) |
95954743 | 4270 | { |
5fdda392 | 4271 | if (resume[ndx].kind == resume_stop |
8336d594 | 4272 | && thread->last_resume_kind == resume_stop) |
d50171e4 | 4273 | { |
c058728c SM |
4274 | threads_debug_printf |
4275 | ("already %s LWP %ld at GDB's request", | |
4276 | (thread->last_status.kind () == TARGET_WAITKIND_STOPPED | |
4277 | ? "stopped" : "stopping"), | |
4278 | lwpid_of (thread)); | |
d50171e4 PA |
4279 | |
4280 | continue; | |
4281 | } | |
4282 | ||
5a04c4cf PA |
4283 | /* Ignore (wildcard) resume requests for already-resumed |
4284 | threads. */ | |
5fdda392 | 4285 | if (resume[ndx].kind != resume_stop |
5a04c4cf PA |
4286 | && thread->last_resume_kind != resume_stop) |
4287 | { | |
c058728c SM |
4288 | threads_debug_printf |
4289 | ("already %s LWP %ld at GDB's request", | |
4290 | (thread->last_resume_kind == resume_step | |
4291 | ? "stepping" : "continuing"), | |
4292 | lwpid_of (thread)); | |
5a04c4cf PA |
4293 | continue; |
4294 | } | |
4295 | ||
393a6b59 PA |
4296 | /* Don't let wildcard resumes resume fork/vfork/clone |
4297 | children that GDB does not yet know are new children. */ | |
4298 | if (lwp->relative != NULL) | |
5a04c4cf | 4299 | { |
393a6b59 | 4300 | struct lwp_info *rel = lwp->relative; |
5a04c4cf PA |
4301 | |
4302 | if (rel->status_pending_p | |
393a6b59 | 4303 | && is_new_child_status (rel->waitstatus.kind ())) |
5a04c4cf | 4304 | { |
c058728c SM |
4305 | threads_debug_printf |
4306 | ("not resuming LWP %ld: has queued stop reply", | |
4307 | lwpid_of (thread)); | |
5a04c4cf PA |
4308 | continue; |
4309 | } | |
4310 | } | |
4311 | ||
4312 | /* If the thread has a pending event that has already been | |
4313 | reported to GDBserver core, but GDB has not pulled the | |
4314 | event out of the vStopped queue yet, likewise, ignore the | |
4315 | (wildcard) resume request. */ | |
9c80ecd6 | 4316 | if (in_queued_stop_replies (thread->id)) |
5a04c4cf | 4317 | { |
c058728c SM |
4318 | threads_debug_printf |
4319 | ("not resuming LWP %ld: has queued stop reply", | |
4320 | lwpid_of (thread)); | |
5a04c4cf PA |
4321 | continue; |
4322 | } | |
4323 | ||
5fdda392 | 4324 | lwp->resume = &resume[ndx]; |
8336d594 | 4325 | thread->last_resume_kind = lwp->resume->kind; |
fa593d66 | 4326 | |
c2d6af84 PA |
4327 | lwp->step_range_start = lwp->resume->step_range_start; |
4328 | lwp->step_range_end = lwp->resume->step_range_end; | |
4329 | ||
fa593d66 PA |
4330 | /* If we had a deferred signal to report, dequeue one now. |
4331 | This can happen if LWP gets more than one signal while | |
4332 | trying to get out of a jump pad. */ | |
4333 | if (lwp->stopped | |
4334 | && !lwp->status_pending_p | |
4335 | && dequeue_one_deferred_signal (lwp, &lwp->status_pending)) | |
4336 | { | |
4337 | lwp->status_pending_p = 1; | |
4338 | ||
c058728c SM |
4339 | threads_debug_printf |
4340 | ("Dequeueing deferred signal %d for LWP %ld, " | |
4341 | "leaving status pending.", | |
4342 | WSTOPSIG (lwp->status_pending), | |
4343 | lwpid_of (thread)); | |
fa593d66 PA |
4344 | } |
4345 | ||
5fdda392 | 4346 | return; |
95954743 PA |
4347 | } |
4348 | } | |
2bd7c093 PA |
4349 | |
4350 | /* No resume action for this thread. */ | |
4351 | lwp->resume = NULL; | |
5544ad89 DJ |
4352 | } |
4353 | ||
df95181f TBA |
4354 | bool |
4355 | linux_process_target::resume_status_pending (thread_info *thread) | |
5544ad89 | 4356 | { |
d86d4aaf | 4357 | struct lwp_info *lwp = get_thread_lwp (thread); |
5544ad89 | 4358 | |
bd99dc85 PA |
4359 | /* LWPs which will not be resumed are not interesting, because |
4360 | we might not wait for them next time through linux_wait. */ | |
2bd7c093 | 4361 | if (lwp->resume == NULL) |
25c28b4d | 4362 | return false; |
64386c31 | 4363 | |
df95181f | 4364 | return thread_still_has_status_pending (thread); |
d50171e4 PA |
4365 | } |
4366 | ||
df95181f TBA |
4367 | bool |
4368 | linux_process_target::thread_needs_step_over (thread_info *thread) | |
d50171e4 | 4369 | { |
d86d4aaf | 4370 | struct lwp_info *lwp = get_thread_lwp (thread); |
d50171e4 | 4371 | CORE_ADDR pc; |
c06cbd92 YQ |
4372 | struct process_info *proc = get_thread_process (thread); |
4373 | ||
4374 | /* GDBserver is skipping the extra traps from the wrapper program, | |
4375 | don't have to do step over. */ | |
4376 | if (proc->tdesc == NULL) | |
eca55aec | 4377 | return false; |
d50171e4 PA |
4378 | |
4379 | /* LWPs which will not be resumed are not interesting, because we | |
4380 | might not wait for them next time through linux_wait. */ | |
4381 | ||
4382 | if (!lwp->stopped) | |
4383 | { | |
c058728c SM |
4384 | threads_debug_printf ("Need step over [LWP %ld]? Ignoring, not stopped", |
4385 | lwpid_of (thread)); | |
eca55aec | 4386 | return false; |
d50171e4 PA |
4387 | } |
4388 | ||
8336d594 | 4389 | if (thread->last_resume_kind == resume_stop) |
d50171e4 | 4390 | { |
c058728c SM |
4391 | threads_debug_printf |
4392 | ("Need step over [LWP %ld]? Ignoring, should remain stopped", | |
4393 | lwpid_of (thread)); | |
eca55aec | 4394 | return false; |
d50171e4 PA |
4395 | } |
4396 | ||
7984d532 PA |
4397 | gdb_assert (lwp->suspended >= 0); |
4398 | ||
4399 | if (lwp->suspended) | |
4400 | { | |
c058728c SM |
4401 | threads_debug_printf ("Need step over [LWP %ld]? Ignoring, suspended", |
4402 | lwpid_of (thread)); | |
eca55aec | 4403 | return false; |
7984d532 PA |
4404 | } |
4405 | ||
bd99dc85 | 4406 | if (lwp->status_pending_p) |
d50171e4 | 4407 | { |
c058728c SM |
4408 | threads_debug_printf |
4409 | ("Need step over [LWP %ld]? Ignoring, has pending status.", | |
4410 | lwpid_of (thread)); | |
eca55aec | 4411 | return false; |
d50171e4 PA |
4412 | } |
4413 | ||
4414 | /* Note: PC, not STOP_PC. Either GDB has adjusted the PC already, | |
4415 | or we have. */ | |
4416 | pc = get_pc (lwp); | |
4417 | ||
4418 | /* If the PC has changed since we stopped, then don't do anything, | |
4419 | and let the breakpoint/tracepoint be hit. This happens if, for | |
4420 | instance, GDB handled the decr_pc_after_break subtraction itself, | |
4421 | GDB is OOL stepping this thread, or the user has issued a "jump" | |
4422 | command, or poked thread's registers herself. */ | |
4423 | if (pc != lwp->stop_pc) | |
4424 | { | |
c058728c SM |
4425 | threads_debug_printf |
4426 | ("Need step over [LWP %ld]? Cancelling, PC was changed. " | |
4427 | "Old stop_pc was 0x%s, PC is now 0x%s", lwpid_of (thread), | |
4428 | paddress (lwp->stop_pc), paddress (pc)); | |
eca55aec | 4429 | return false; |
d50171e4 PA |
4430 | } |
4431 | ||
484b3c32 YQ |
4432 | /* On software single step target, resume the inferior with signal |
4433 | rather than stepping over. */ | |
7582c77c | 4434 | if (supports_software_single_step () |
013e3554 | 4435 | && !lwp->pending_signals.empty () |
484b3c32 YQ |
4436 | && lwp_signal_can_be_delivered (lwp)) |
4437 | { | |
c058728c SM |
4438 | threads_debug_printf |
4439 | ("Need step over [LWP %ld]? Ignoring, has pending signals.", | |
4440 | lwpid_of (thread)); | |
484b3c32 | 4441 | |
eca55aec | 4442 | return false; |
484b3c32 YQ |
4443 | } |
4444 | ||
24583e45 TBA |
4445 | scoped_restore_current_thread restore_thread; |
4446 | switch_to_thread (thread); | |
d50171e4 | 4447 | |
8b07ae33 | 4448 | /* We can only step over breakpoints we know about. */ |
fa593d66 | 4449 | if (breakpoint_here (pc) || fast_tracepoint_jump_here (pc)) |
d50171e4 | 4450 | { |
8b07ae33 | 4451 | /* Don't step over a breakpoint that GDB expects to hit |
9f3a5c85 LM |
4452 | though. If the condition is being evaluated on the target's side |
4453 | and it evaluate to false, step over this breakpoint as well. */ | |
4454 | if (gdb_breakpoint_here (pc) | |
d3ce09f5 SS |
4455 | && gdb_condition_true_at_breakpoint (pc) |
4456 | && gdb_no_commands_at_breakpoint (pc)) | |
8b07ae33 | 4457 | { |
c058728c SM |
4458 | threads_debug_printf ("Need step over [LWP %ld]? yes, but found" |
4459 | " GDB breakpoint at 0x%s; skipping step over", | |
4460 | lwpid_of (thread), paddress (pc)); | |
d50171e4 | 4461 | |
eca55aec | 4462 | return false; |
8b07ae33 PA |
4463 | } |
4464 | else | |
4465 | { | |
c058728c SM |
4466 | threads_debug_printf ("Need step over [LWP %ld]? yes, " |
4467 | "found breakpoint at 0x%s", | |
4468 | lwpid_of (thread), paddress (pc)); | |
d50171e4 | 4469 | |
8b07ae33 | 4470 | /* We've found an lwp that needs stepping over --- return 1 so |
8f86d7aa | 4471 | that find_thread stops looking. */ |
eca55aec | 4472 | return true; |
8b07ae33 | 4473 | } |
d50171e4 PA |
4474 | } |
4475 | ||
c058728c SM |
4476 | threads_debug_printf |
4477 | ("Need step over [LWP %ld]? No, no breakpoint found at 0x%s", | |
4478 | lwpid_of (thread), paddress (pc)); | |
c6ecbae5 | 4479 | |
eca55aec | 4480 | return false; |
5544ad89 DJ |
4481 | } |
4482 | ||
d16f3f6c TBA |
4483 | void |
4484 | linux_process_target::start_step_over (lwp_info *lwp) | |
d50171e4 | 4485 | { |
d86d4aaf | 4486 | struct thread_info *thread = get_lwp_thread (lwp); |
d50171e4 | 4487 | CORE_ADDR pc; |
d50171e4 | 4488 | |
c058728c SM |
4489 | threads_debug_printf ("Starting step-over on LWP %ld. Stopping all threads", |
4490 | lwpid_of (thread)); | |
d50171e4 | 4491 | |
7984d532 | 4492 | stop_all_lwps (1, lwp); |
863d01bd PA |
4493 | |
4494 | if (lwp->suspended != 0) | |
4495 | { | |
f34652de | 4496 | internal_error ("LWP %ld suspended=%d\n", lwpid_of (thread), |
863d01bd PA |
4497 | lwp->suspended); |
4498 | } | |
d50171e4 | 4499 | |
c058728c | 4500 | threads_debug_printf ("Done stopping all threads for step-over."); |
d50171e4 PA |
4501 | |
4502 | /* Note, we should always reach here with an already adjusted PC, | |
4503 | either by GDB (if we're resuming due to GDB's request), or by our | |
4504 | caller, if we just finished handling an internal breakpoint GDB | |
4505 | shouldn't care about. */ | |
4506 | pc = get_pc (lwp); | |
4507 | ||
24583e45 TBA |
4508 | bool step = false; |
4509 | { | |
4510 | scoped_restore_current_thread restore_thread; | |
4511 | switch_to_thread (thread); | |
d50171e4 | 4512 | |
24583e45 TBA |
4513 | lwp->bp_reinsert = pc; |
4514 | uninsert_breakpoints_at (pc); | |
4515 | uninsert_fast_tracepoint_jumps_at (pc); | |
d50171e4 | 4516 | |
24583e45 TBA |
4517 | step = single_step (lwp); |
4518 | } | |
d50171e4 | 4519 | |
df95181f | 4520 | resume_one_lwp (lwp, step, 0, NULL); |
d50171e4 PA |
4521 | |
4522 | /* Require next event from this LWP. */ | |
9c80ecd6 | 4523 | step_over_bkpt = thread->id; |
d50171e4 PA |
4524 | } |
4525 | ||
b31cdfa6 TBA |
4526 | bool |
4527 | linux_process_target::finish_step_over (lwp_info *lwp) | |
d50171e4 PA |
4528 | { |
4529 | if (lwp->bp_reinsert != 0) | |
4530 | { | |
24583e45 | 4531 | scoped_restore_current_thread restore_thread; |
f79b145d | 4532 | |
c058728c | 4533 | threads_debug_printf ("Finished step over."); |
d50171e4 | 4534 | |
24583e45 | 4535 | switch_to_thread (get_lwp_thread (lwp)); |
f79b145d | 4536 | |
d50171e4 PA |
4537 | /* Reinsert any breakpoint at LWP->BP_REINSERT. Note that there |
4538 | may be no breakpoint to reinsert there by now. */ | |
4539 | reinsert_breakpoints_at (lwp->bp_reinsert); | |
fa593d66 | 4540 | reinsert_fast_tracepoint_jumps_at (lwp->bp_reinsert); |
d50171e4 PA |
4541 | |
4542 | lwp->bp_reinsert = 0; | |
4543 | ||
3b9a79ef YQ |
4544 | /* Delete any single-step breakpoints. No longer needed. We |
4545 | don't have to worry about other threads hitting this trap, | |
4546 | and later not being able to explain it, because we were | |
4547 | stepping over a breakpoint, and we hold all threads but | |
4548 | LWP stopped while doing that. */ | |
b31cdfa6 | 4549 | if (!supports_hardware_single_step ()) |
f79b145d | 4550 | { |
3b9a79ef YQ |
4551 | gdb_assert (has_single_step_breakpoints (current_thread)); |
4552 | delete_single_step_breakpoints (current_thread); | |
f79b145d | 4553 | } |
d50171e4 PA |
4554 | |
4555 | step_over_bkpt = null_ptid; | |
b31cdfa6 | 4556 | return true; |
d50171e4 PA |
4557 | } |
4558 | else | |
b31cdfa6 | 4559 | return false; |
d50171e4 PA |
4560 | } |
4561 | ||
d16f3f6c TBA |
4562 | void |
4563 | linux_process_target::complete_ongoing_step_over () | |
863d01bd | 4564 | { |
d7e15655 | 4565 | if (step_over_bkpt != null_ptid) |
863d01bd PA |
4566 | { |
4567 | struct lwp_info *lwp; | |
4568 | int wstat; | |
4569 | int ret; | |
4570 | ||
c058728c | 4571 | threads_debug_printf ("detach: step over in progress, finish it first"); |
863d01bd PA |
4572 | |
4573 | /* Passing NULL_PTID as filter indicates we want all events to | |
4574 | be left pending. Eventually this returns when there are no | |
4575 | unwaited-for children left. */ | |
d16f3f6c TBA |
4576 | ret = wait_for_event_filtered (minus_one_ptid, null_ptid, &wstat, |
4577 | __WALL); | |
863d01bd PA |
4578 | gdb_assert (ret == -1); |
4579 | ||
4580 | lwp = find_lwp_pid (step_over_bkpt); | |
4581 | if (lwp != NULL) | |
7e9cf1fe PA |
4582 | { |
4583 | finish_step_over (lwp); | |
4584 | ||
4585 | /* If we got our step SIGTRAP, don't leave it pending, | |
4586 | otherwise we would report it to GDB as a spurious | |
4587 | SIGTRAP. */ | |
4588 | gdb_assert (lwp->status_pending_p); | |
4589 | if (WIFSTOPPED (lwp->status_pending) | |
4590 | && WSTOPSIG (lwp->status_pending) == SIGTRAP) | |
4591 | { | |
4592 | thread_info *thread = get_lwp_thread (lwp); | |
4593 | if (thread->last_resume_kind != resume_step) | |
4594 | { | |
c058728c | 4595 | threads_debug_printf ("detach: discard step-over SIGTRAP"); |
7e9cf1fe PA |
4596 | |
4597 | lwp->status_pending_p = 0; | |
4598 | lwp->status_pending = 0; | |
4599 | resume_one_lwp (lwp, lwp->stepping, 0, NULL); | |
4600 | } | |
4601 | else | |
c058728c SM |
4602 | threads_debug_printf |
4603 | ("detach: resume_step, not discarding step-over SIGTRAP"); | |
7e9cf1fe PA |
4604 | } |
4605 | } | |
863d01bd PA |
4606 | step_over_bkpt = null_ptid; |
4607 | unsuspend_all_lwps (lwp); | |
4608 | } | |
4609 | } | |
4610 | ||
df95181f TBA |
4611 | void |
4612 | linux_process_target::resume_one_thread (thread_info *thread, | |
4613 | bool leave_all_stopped) | |
5544ad89 | 4614 | { |
d86d4aaf | 4615 | struct lwp_info *lwp = get_thread_lwp (thread); |
d50171e4 | 4616 | int leave_pending; |
5544ad89 | 4617 | |
2bd7c093 | 4618 | if (lwp->resume == NULL) |
c80825ff | 4619 | return; |
5544ad89 | 4620 | |
bd99dc85 | 4621 | if (lwp->resume->kind == resume_stop) |
5544ad89 | 4622 | { |
c058728c SM |
4623 | threads_debug_printf ("resume_stop request for LWP %ld", |
4624 | lwpid_of (thread)); | |
bd99dc85 PA |
4625 | |
4626 | if (!lwp->stopped) | |
4627 | { | |
c058728c | 4628 | threads_debug_printf ("stopping LWP %ld", lwpid_of (thread)); |
bd99dc85 | 4629 | |
d50171e4 PA |
4630 | /* Stop the thread, and wait for the event asynchronously, |
4631 | through the event loop. */ | |
02fc4de7 | 4632 | send_sigstop (lwp); |
bd99dc85 PA |
4633 | } |
4634 | else | |
4635 | { | |
c058728c | 4636 | threads_debug_printf ("already stopped LWP %ld", lwpid_of (thread)); |
d50171e4 PA |
4637 | |
4638 | /* The LWP may have been stopped in an internal event that | |
4639 | was not meant to be notified back to GDB (e.g., gdbserver | |
4640 | breakpoint), so we should be reporting a stop event in | |
4641 | this case too. */ | |
4642 | ||
4643 | /* If the thread already has a pending SIGSTOP, this is a | |
4644 | no-op. Otherwise, something later will presumably resume | |
4645 | the thread and this will cause it to cancel any pending | |
4646 | operation, due to last_resume_kind == resume_stop. If | |
4647 | the thread already has a pending status to report, we | |
4648 | will still report it the next time we wait - see | |
4649 | status_pending_p_callback. */ | |
1a981360 PA |
4650 | |
4651 | /* If we already have a pending signal to report, then | |
4652 | there's no need to queue a SIGSTOP, as this means we're | |
4653 | midway through moving the LWP out of the jumppad, and we | |
4654 | will report the pending signal as soon as that is | |
4655 | finished. */ | |
013e3554 | 4656 | if (lwp->pending_signals_to_report.empty ()) |
1a981360 | 4657 | send_sigstop (lwp); |
bd99dc85 | 4658 | } |
32ca6d61 | 4659 | |
bd99dc85 PA |
4660 | /* For stop requests, we're done. */ |
4661 | lwp->resume = NULL; | |
183be222 | 4662 | thread->last_status.set_ignore (); |
c80825ff | 4663 | return; |
5544ad89 DJ |
4664 | } |
4665 | ||
bd99dc85 | 4666 | /* If this thread which is about to be resumed has a pending status, |
863d01bd PA |
4667 | then don't resume it - we can just report the pending status. |
4668 | Likewise if it is suspended, because e.g., another thread is | |
4669 | stepping past a breakpoint. Make sure to queue any signals that | |
4670 | would otherwise be sent. In all-stop mode, we do this decision | |
4671 | based on if *any* thread has a pending status. If there's a | |
4672 | thread that needs the step-over-breakpoint dance, then don't | |
4673 | resume any other thread but that particular one. */ | |
4674 | leave_pending = (lwp->suspended | |
4675 | || lwp->status_pending_p | |
4676 | || leave_all_stopped); | |
5544ad89 | 4677 | |
0e9a339e YQ |
4678 | /* If we have a new signal, enqueue the signal. */ |
4679 | if (lwp->resume->sig != 0) | |
4680 | { | |
4681 | siginfo_t info, *info_p; | |
4682 | ||
4683 | /* If this is the same signal we were previously stopped by, | |
4684 | make sure to queue its siginfo. */ | |
4685 | if (WIFSTOPPED (lwp->last_status) | |
4686 | && WSTOPSIG (lwp->last_status) == lwp->resume->sig | |
4687 | && ptrace (PTRACE_GETSIGINFO, lwpid_of (thread), | |
4688 | (PTRACE_TYPE_ARG3) 0, &info) == 0) | |
4689 | info_p = &info; | |
4690 | else | |
4691 | info_p = NULL; | |
4692 | ||
4693 | enqueue_pending_signal (lwp, lwp->resume->sig, info_p); | |
4694 | } | |
4695 | ||
d50171e4 | 4696 | if (!leave_pending) |
bd99dc85 | 4697 | { |
c058728c | 4698 | threads_debug_printf ("resuming LWP %ld", lwpid_of (thread)); |
5544ad89 | 4699 | |
9c80ecd6 | 4700 | proceed_one_lwp (thread, NULL); |
bd99dc85 PA |
4701 | } |
4702 | else | |
c058728c | 4703 | threads_debug_printf ("leaving LWP %ld stopped", lwpid_of (thread)); |
5544ad89 | 4704 | |
183be222 | 4705 | thread->last_status.set_ignore (); |
bd99dc85 | 4706 | lwp->resume = NULL; |
0d62e5e8 DJ |
4707 | } |
4708 | ||
0e4d7e35 TBA |
4709 | void |
4710 | linux_process_target::resume (thread_resume *resume_info, size_t n) | |
0d62e5e8 | 4711 | { |
d86d4aaf | 4712 | struct thread_info *need_step_over = NULL; |
c6ecbae5 | 4713 | |
c058728c | 4714 | THREADS_SCOPED_DEBUG_ENTER_EXIT; |
87ce2a04 | 4715 | |
5fdda392 SM |
4716 | for_each_thread ([&] (thread_info *thread) |
4717 | { | |
4718 | linux_set_resume_request (thread, resume_info, n); | |
4719 | }); | |
5544ad89 | 4720 | |
d50171e4 PA |
4721 | /* If there is a thread which would otherwise be resumed, which has |
4722 | a pending status, then don't resume any threads - we can just | |
4723 | report the pending status. Make sure to queue any signals that | |
4724 | would otherwise be sent. In non-stop mode, we'll apply this | |
4725 | logic to each thread individually. We consume all pending events | |
4726 | before considering to start a step-over (in all-stop). */ | |
25c28b4d | 4727 | bool any_pending = false; |
bd99dc85 | 4728 | if (!non_stop) |
df95181f TBA |
4729 | any_pending = find_thread ([this] (thread_info *thread) |
4730 | { | |
4731 | return resume_status_pending (thread); | |
4732 | }) != nullptr; | |
d50171e4 PA |
4733 | |
4734 | /* If there is a thread which would otherwise be resumed, which is | |
4735 | stopped at a breakpoint that needs stepping over, then don't | |
4736 | resume any threads - have it step over the breakpoint with all | |
4737 | other threads stopped, then resume all threads again. Make sure | |
4738 | to queue any signals that would otherwise be delivered or | |
4739 | queued. */ | |
bf9ae9d8 | 4740 | if (!any_pending && low_supports_breakpoints ()) |
df95181f TBA |
4741 | need_step_over = find_thread ([this] (thread_info *thread) |
4742 | { | |
4743 | return thread_needs_step_over (thread); | |
4744 | }); | |
d50171e4 | 4745 | |
c80825ff | 4746 | bool leave_all_stopped = (need_step_over != NULL || any_pending); |
d50171e4 | 4747 | |
c058728c SM |
4748 | if (need_step_over != NULL) |
4749 | threads_debug_printf ("Not resuming all, need step over"); | |
4750 | else if (any_pending) | |
4751 | threads_debug_printf ("Not resuming, all-stop and found " | |
4752 | "an LWP with pending status"); | |
4753 | else | |
4754 | threads_debug_printf ("Resuming, no pending status or step over needed"); | |
d50171e4 PA |
4755 | |
4756 | /* Even if we're leaving threads stopped, queue all signals we'd | |
4757 | otherwise deliver. */ | |
c80825ff SM |
4758 | for_each_thread ([&] (thread_info *thread) |
4759 | { | |
df95181f | 4760 | resume_one_thread (thread, leave_all_stopped); |
c80825ff | 4761 | }); |
d50171e4 PA |
4762 | |
4763 | if (need_step_over) | |
d86d4aaf | 4764 | start_step_over (get_thread_lwp (need_step_over)); |
87ce2a04 | 4765 | |
1bebeeca PA |
4766 | /* We may have events that were pending that can/should be sent to |
4767 | the client now. Trigger a linux_wait call. */ | |
4768 | if (target_is_async_p ()) | |
4769 | async_file_mark (); | |
d50171e4 PA |
4770 | } |
4771 | ||
df95181f TBA |
4772 | void |
4773 | linux_process_target::proceed_one_lwp (thread_info *thread, lwp_info *except) | |
d50171e4 | 4774 | { |
d86d4aaf | 4775 | struct lwp_info *lwp = get_thread_lwp (thread); |
d50171e4 PA |
4776 | int step; |
4777 | ||
7984d532 | 4778 | if (lwp == except) |
e2b44075 | 4779 | return; |
d50171e4 | 4780 | |
c058728c | 4781 | threads_debug_printf ("lwp %ld", lwpid_of (thread)); |
d50171e4 PA |
4782 | |
4783 | if (!lwp->stopped) | |
4784 | { | |
c058728c | 4785 | threads_debug_printf (" LWP %ld already running", lwpid_of (thread)); |
e2b44075 | 4786 | return; |
d50171e4 PA |
4787 | } |
4788 | ||
02fc4de7 | 4789 | if (thread->last_resume_kind == resume_stop |
183be222 | 4790 | && thread->last_status.kind () != TARGET_WAITKIND_IGNORE) |
d50171e4 | 4791 | { |
c058728c SM |
4792 | threads_debug_printf (" client wants LWP to remain %ld stopped", |
4793 | lwpid_of (thread)); | |
e2b44075 | 4794 | return; |
d50171e4 PA |
4795 | } |
4796 | ||
4797 | if (lwp->status_pending_p) | |
4798 | { | |
c058728c SM |
4799 | threads_debug_printf (" LWP %ld has pending status, leaving stopped", |
4800 | lwpid_of (thread)); | |
e2b44075 | 4801 | return; |
d50171e4 PA |
4802 | } |
4803 | ||
7984d532 PA |
4804 | gdb_assert (lwp->suspended >= 0); |
4805 | ||
d50171e4 PA |
4806 | if (lwp->suspended) |
4807 | { | |
c058728c | 4808 | threads_debug_printf (" LWP %ld is suspended", lwpid_of (thread)); |
e2b44075 | 4809 | return; |
d50171e4 PA |
4810 | } |
4811 | ||
1a981360 | 4812 | if (thread->last_resume_kind == resume_stop |
013e3554 | 4813 | && lwp->pending_signals_to_report.empty () |
229d26fc SM |
4814 | && (lwp->collecting_fast_tracepoint |
4815 | == fast_tpoint_collect_result::not_collecting)) | |
02fc4de7 PA |
4816 | { |
4817 | /* We haven't reported this LWP as stopped yet (otherwise, the | |
4818 | last_status.kind check above would catch it, and we wouldn't | |
4819 | reach here. This LWP may have been momentarily paused by a | |
4820 | stop_all_lwps call while handling for example, another LWP's | |
4821 | step-over. In that case, the pending expected SIGSTOP signal | |
4822 | that was queued at vCont;t handling time will have already | |
4823 | been consumed by wait_for_sigstop, and so we need to requeue | |
4824 | another one here. Note that if the LWP already has a SIGSTOP | |
4825 | pending, this is a no-op. */ | |
4826 | ||
c058728c SM |
4827 | threads_debug_printf |
4828 | ("Client wants LWP %ld to stop. Making sure it has a SIGSTOP pending", | |
4829 | lwpid_of (thread)); | |
02fc4de7 PA |
4830 | |
4831 | send_sigstop (lwp); | |
4832 | } | |
4833 | ||
863d01bd PA |
4834 | if (thread->last_resume_kind == resume_step) |
4835 | { | |
c058728c SM |
4836 | threads_debug_printf (" stepping LWP %ld, client wants it stepping", |
4837 | lwpid_of (thread)); | |
8901d193 | 4838 | |
3b9a79ef | 4839 | /* If resume_step is requested by GDB, install single-step |
8901d193 | 4840 | breakpoints when the thread is about to be actually resumed if |
3b9a79ef | 4841 | the single-step breakpoints weren't removed. */ |
7582c77c | 4842 | if (supports_software_single_step () |
3b9a79ef | 4843 | && !has_single_step_breakpoints (thread)) |
8901d193 YQ |
4844 | install_software_single_step_breakpoints (lwp); |
4845 | ||
4846 | step = maybe_hw_step (thread); | |
863d01bd PA |
4847 | } |
4848 | else if (lwp->bp_reinsert != 0) | |
4849 | { | |
c058728c SM |
4850 | threads_debug_printf (" stepping LWP %ld, reinsert set", |
4851 | lwpid_of (thread)); | |
f79b145d YQ |
4852 | |
4853 | step = maybe_hw_step (thread); | |
863d01bd PA |
4854 | } |
4855 | else | |
4856 | step = 0; | |
4857 | ||
df95181f | 4858 | resume_one_lwp (lwp, step, 0, NULL); |
7984d532 PA |
4859 | } |
4860 | ||
df95181f TBA |
4861 | void |
4862 | linux_process_target::unsuspend_and_proceed_one_lwp (thread_info *thread, | |
4863 | lwp_info *except) | |
7984d532 | 4864 | { |
d86d4aaf | 4865 | struct lwp_info *lwp = get_thread_lwp (thread); |
7984d532 PA |
4866 | |
4867 | if (lwp == except) | |
e2b44075 | 4868 | return; |
7984d532 | 4869 | |
863d01bd | 4870 | lwp_suspended_decr (lwp); |
7984d532 | 4871 | |
e2b44075 | 4872 | proceed_one_lwp (thread, except); |
d50171e4 PA |
4873 | } |
4874 | ||
d16f3f6c TBA |
4875 | void |
4876 | linux_process_target::proceed_all_lwps () | |
d50171e4 | 4877 | { |
d86d4aaf | 4878 | struct thread_info *need_step_over; |
d50171e4 PA |
4879 | |
4880 | /* If there is a thread which would otherwise be resumed, which is | |
4881 | stopped at a breakpoint that needs stepping over, then don't | |
4882 | resume any threads - have it step over the breakpoint with all | |
4883 | other threads stopped, then resume all threads again. */ | |
4884 | ||
bf9ae9d8 | 4885 | if (low_supports_breakpoints ()) |
d50171e4 | 4886 | { |
df95181f TBA |
4887 | need_step_over = find_thread ([this] (thread_info *thread) |
4888 | { | |
4889 | return thread_needs_step_over (thread); | |
4890 | }); | |
d50171e4 PA |
4891 | |
4892 | if (need_step_over != NULL) | |
4893 | { | |
c058728c SM |
4894 | threads_debug_printf ("found thread %ld needing a step-over", |
4895 | lwpid_of (need_step_over)); | |
d50171e4 | 4896 | |
d86d4aaf | 4897 | start_step_over (get_thread_lwp (need_step_over)); |
d50171e4 PA |
4898 | return; |
4899 | } | |
4900 | } | |
5544ad89 | 4901 | |
c058728c | 4902 | threads_debug_printf ("Proceeding, no step-over needed"); |
d50171e4 | 4903 | |
df95181f | 4904 | for_each_thread ([this] (thread_info *thread) |
e2b44075 SM |
4905 | { |
4906 | proceed_one_lwp (thread, NULL); | |
4907 | }); | |
d50171e4 PA |
4908 | } |
4909 | ||
d16f3f6c TBA |
4910 | void |
4911 | linux_process_target::unstop_all_lwps (int unsuspend, lwp_info *except) | |
d50171e4 | 4912 | { |
c058728c SM |
4913 | THREADS_SCOPED_DEBUG_ENTER_EXIT; |
4914 | ||
4915 | if (except) | |
4916 | threads_debug_printf ("except=(LWP %ld)", | |
4917 | lwpid_of (get_lwp_thread (except))); | |
4918 | else | |
4919 | threads_debug_printf ("except=nullptr"); | |
5544ad89 | 4920 | |
7984d532 | 4921 | if (unsuspend) |
e2b44075 SM |
4922 | for_each_thread ([&] (thread_info *thread) |
4923 | { | |
4924 | unsuspend_and_proceed_one_lwp (thread, except); | |
4925 | }); | |
7984d532 | 4926 | else |
e2b44075 SM |
4927 | for_each_thread ([&] (thread_info *thread) |
4928 | { | |
4929 | proceed_one_lwp (thread, except); | |
4930 | }); | |
0d62e5e8 DJ |
4931 | } |
4932 | ||
58caa3dc DJ |
4933 | |
4934 | #ifdef HAVE_LINUX_REGSETS | |
4935 | ||
1faeff08 MR |
4936 | #define use_linux_regsets 1 |
4937 | ||
030031ee PA |
4938 | /* Returns true if REGSET has been disabled. */ |
4939 | ||
4940 | static int | |
4941 | regset_disabled (struct regsets_info *info, struct regset_info *regset) | |
4942 | { | |
4943 | return (info->disabled_regsets != NULL | |
4944 | && info->disabled_regsets[regset - info->regsets]); | |
4945 | } | |
4946 | ||
4947 | /* Disable REGSET. */ | |
4948 | ||
4949 | static void | |
4950 | disable_regset (struct regsets_info *info, struct regset_info *regset) | |
4951 | { | |
4952 | int dr_offset; | |
4953 | ||
4954 | dr_offset = regset - info->regsets; | |
4955 | if (info->disabled_regsets == NULL) | |
224c3ddb | 4956 | info->disabled_regsets = (char *) xcalloc (1, info->num_regsets); |
030031ee PA |
4957 | info->disabled_regsets[dr_offset] = 1; |
4958 | } | |
4959 | ||
58caa3dc | 4960 | static int |
3aee8918 PA |
4961 | regsets_fetch_inferior_registers (struct regsets_info *regsets_info, |
4962 | struct regcache *regcache) | |
58caa3dc DJ |
4963 | { |
4964 | struct regset_info *regset; | |
e9d25b98 | 4965 | int saw_general_regs = 0; |
95954743 | 4966 | int pid; |
1570b33e | 4967 | struct iovec iov; |
58caa3dc | 4968 | |
0bfdf32f | 4969 | pid = lwpid_of (current_thread); |
28eef672 | 4970 | for (regset = regsets_info->regsets; regset->size >= 0; regset++) |
58caa3dc | 4971 | { |
1570b33e L |
4972 | void *buf, *data; |
4973 | int nt_type, res; | |
58caa3dc | 4974 | |
030031ee | 4975 | if (regset->size == 0 || regset_disabled (regsets_info, regset)) |
28eef672 | 4976 | continue; |
58caa3dc | 4977 | |
bca929d3 | 4978 | buf = xmalloc (regset->size); |
1570b33e L |
4979 | |
4980 | nt_type = regset->nt_type; | |
4981 | if (nt_type) | |
4982 | { | |
4983 | iov.iov_base = buf; | |
4984 | iov.iov_len = regset->size; | |
4985 | data = (void *) &iov; | |
4986 | } | |
4987 | else | |
4988 | data = buf; | |
4989 | ||
dfb64f85 | 4990 | #ifndef __sparc__ |
f15f9948 | 4991 | res = ptrace (regset->get_request, pid, |
b8e1b30e | 4992 | (PTRACE_TYPE_ARG3) (long) nt_type, data); |
dfb64f85 | 4993 | #else |
1570b33e | 4994 | res = ptrace (regset->get_request, pid, data, nt_type); |
dfb64f85 | 4995 | #endif |
58caa3dc DJ |
4996 | if (res < 0) |
4997 | { | |
1ef53e6b AH |
4998 | if (errno == EIO |
4999 | || (errno == EINVAL && regset->type == OPTIONAL_REGS)) | |
58caa3dc | 5000 | { |
1ef53e6b AH |
5001 | /* If we get EIO on a regset, or an EINVAL and the regset is |
5002 | optional, do not try it again for this process mode. */ | |
030031ee | 5003 | disable_regset (regsets_info, regset); |
58caa3dc | 5004 | } |
e5a9158d AA |
5005 | else if (errno == ENODATA) |
5006 | { | |
5007 | /* ENODATA may be returned if the regset is currently | |
5008 | not "active". This can happen in normal operation, | |
5009 | so suppress the warning in this case. */ | |
5010 | } | |
fcd4a73d YQ |
5011 | else if (errno == ESRCH) |
5012 | { | |
5013 | /* At this point, ESRCH should mean the process is | |
5014 | already gone, in which case we simply ignore attempts | |
5015 | to read its registers. */ | |
5016 | } | |
58caa3dc DJ |
5017 | else |
5018 | { | |
0d62e5e8 | 5019 | char s[256]; |
95954743 PA |
5020 | sprintf (s, "ptrace(regsets_fetch_inferior_registers) PID=%d", |
5021 | pid); | |
0d62e5e8 | 5022 | perror (s); |
58caa3dc DJ |
5023 | } |
5024 | } | |
098dbe61 AA |
5025 | else |
5026 | { | |
5027 | if (regset->type == GENERAL_REGS) | |
5028 | saw_general_regs = 1; | |
5029 | regset->store_function (regcache, buf); | |
5030 | } | |
fdeb2a12 | 5031 | free (buf); |
58caa3dc | 5032 | } |
e9d25b98 DJ |
5033 | if (saw_general_regs) |
5034 | return 0; | |
5035 | else | |
5036 | return 1; | |
58caa3dc DJ |
5037 | } |
5038 | ||
5039 | static int | |
3aee8918 PA |
5040 | regsets_store_inferior_registers (struct regsets_info *regsets_info, |
5041 | struct regcache *regcache) | |
58caa3dc DJ |
5042 | { |
5043 | struct regset_info *regset; | |
e9d25b98 | 5044 | int saw_general_regs = 0; |
95954743 | 5045 | int pid; |
1570b33e | 5046 | struct iovec iov; |
58caa3dc | 5047 | |
0bfdf32f | 5048 | pid = lwpid_of (current_thread); |
28eef672 | 5049 | for (regset = regsets_info->regsets; regset->size >= 0; regset++) |
58caa3dc | 5050 | { |
1570b33e L |
5051 | void *buf, *data; |
5052 | int nt_type, res; | |
58caa3dc | 5053 | |
feea5f36 AA |
5054 | if (regset->size == 0 || regset_disabled (regsets_info, regset) |
5055 | || regset->fill_function == NULL) | |
28eef672 | 5056 | continue; |
58caa3dc | 5057 | |
bca929d3 | 5058 | buf = xmalloc (regset->size); |
545587ee DJ |
5059 | |
5060 | /* First fill the buffer with the current register set contents, | |
5061 | in case there are any items in the kernel's regset that are | |
5062 | not in gdbserver's regcache. */ | |
1570b33e L |
5063 | |
5064 | nt_type = regset->nt_type; | |
5065 | if (nt_type) | |
5066 | { | |
5067 | iov.iov_base = buf; | |
5068 | iov.iov_len = regset->size; | |
5069 | data = (void *) &iov; | |
5070 | } | |
5071 | else | |
5072 | data = buf; | |
5073 | ||
dfb64f85 | 5074 | #ifndef __sparc__ |
f15f9948 | 5075 | res = ptrace (regset->get_request, pid, |
b8e1b30e | 5076 | (PTRACE_TYPE_ARG3) (long) nt_type, data); |
dfb64f85 | 5077 | #else |
689cc2ae | 5078 | res = ptrace (regset->get_request, pid, data, nt_type); |
dfb64f85 | 5079 | #endif |
545587ee DJ |
5080 | |
5081 | if (res == 0) | |
5082 | { | |
5083 | /* Then overlay our cached registers on that. */ | |
442ea881 | 5084 | regset->fill_function (regcache, buf); |
545587ee DJ |
5085 | |
5086 | /* Only now do we write the register set. */ | |
dfb64f85 | 5087 | #ifndef __sparc__ |
f15f9948 | 5088 | res = ptrace (regset->set_request, pid, |
b8e1b30e | 5089 | (PTRACE_TYPE_ARG3) (long) nt_type, data); |
dfb64f85 | 5090 | #else |
1570b33e | 5091 | res = ptrace (regset->set_request, pid, data, nt_type); |
dfb64f85 | 5092 | #endif |
545587ee DJ |
5093 | } |
5094 | ||
58caa3dc DJ |
5095 | if (res < 0) |
5096 | { | |
1ef53e6b AH |
5097 | if (errno == EIO |
5098 | || (errno == EINVAL && regset->type == OPTIONAL_REGS)) | |
58caa3dc | 5099 | { |
1ef53e6b AH |
5100 | /* If we get EIO on a regset, or an EINVAL and the regset is |
5101 | optional, do not try it again for this process mode. */ | |
030031ee | 5102 | disable_regset (regsets_info, regset); |
58caa3dc | 5103 | } |
3221518c UW |
5104 | else if (errno == ESRCH) |
5105 | { | |
1b3f6016 PA |
5106 | /* At this point, ESRCH should mean the process is |
5107 | already gone, in which case we simply ignore attempts | |
5108 | to change its registers. See also the related | |
df95181f | 5109 | comment in resume_one_lwp. */ |
fdeb2a12 | 5110 | free (buf); |
3221518c UW |
5111 | return 0; |
5112 | } | |
58caa3dc DJ |
5113 | else |
5114 | { | |
ce3a066d | 5115 | perror ("Warning: ptrace(regsets_store_inferior_registers)"); |
58caa3dc DJ |
5116 | } |
5117 | } | |
e9d25b98 DJ |
5118 | else if (regset->type == GENERAL_REGS) |
5119 | saw_general_regs = 1; | |
09ec9b38 | 5120 | free (buf); |
58caa3dc | 5121 | } |
e9d25b98 DJ |
5122 | if (saw_general_regs) |
5123 | return 0; | |
5124 | else | |
5125 | return 1; | |
58caa3dc DJ |
5126 | } |
5127 | ||
1faeff08 | 5128 | #else /* !HAVE_LINUX_REGSETS */ |
58caa3dc | 5129 | |
1faeff08 | 5130 | #define use_linux_regsets 0 |
3aee8918 PA |
5131 | #define regsets_fetch_inferior_registers(regsets_info, regcache) 1 |
5132 | #define regsets_store_inferior_registers(regsets_info, regcache) 1 | |
58caa3dc | 5133 | |
58caa3dc | 5134 | #endif |
1faeff08 MR |
5135 | |
5136 | /* Return 1 if register REGNO is supported by one of the regset ptrace | |
5137 | calls or 0 if it has to be transferred individually. */ | |
5138 | ||
5139 | static int | |
3aee8918 | 5140 | linux_register_in_regsets (const struct regs_info *regs_info, int regno) |
1faeff08 MR |
5141 | { |
5142 | unsigned char mask = 1 << (regno % 8); | |
5143 | size_t index = regno / 8; | |
5144 | ||
5145 | return (use_linux_regsets | |
3aee8918 PA |
5146 | && (regs_info->regset_bitmap == NULL |
5147 | || (regs_info->regset_bitmap[index] & mask) != 0)); | |
1faeff08 MR |
5148 | } |
5149 | ||
58caa3dc | 5150 | #ifdef HAVE_LINUX_USRREGS |
1faeff08 | 5151 | |
5b3da067 | 5152 | static int |
3aee8918 | 5153 | register_addr (const struct usrregs_info *usrregs, int regnum) |
1faeff08 MR |
5154 | { |
5155 | int addr; | |
5156 | ||
3aee8918 | 5157 | if (regnum < 0 || regnum >= usrregs->num_regs) |
1faeff08 MR |
5158 | error ("Invalid register number %d.", regnum); |
5159 | ||
3aee8918 | 5160 | addr = usrregs->regmap[regnum]; |
1faeff08 MR |
5161 | |
5162 | return addr; | |
5163 | } | |
5164 | ||
daca57a7 TBA |
5165 | |
5166 | void | |
5167 | linux_process_target::fetch_register (const usrregs_info *usrregs, | |
5168 | regcache *regcache, int regno) | |
1faeff08 MR |
5169 | { |
5170 | CORE_ADDR regaddr; | |
5171 | int i, size; | |
5172 | char *buf; | |
5173 | int pid; | |
5174 | ||
3aee8918 | 5175 | if (regno >= usrregs->num_regs) |
1faeff08 | 5176 | return; |
daca57a7 | 5177 | if (low_cannot_fetch_register (regno)) |
1faeff08 MR |
5178 | return; |
5179 | ||
3aee8918 | 5180 | regaddr = register_addr (usrregs, regno); |
1faeff08 MR |
5181 | if (regaddr == -1) |
5182 | return; | |
5183 | ||
3aee8918 PA |
5184 | size = ((register_size (regcache->tdesc, regno) |
5185 | + sizeof (PTRACE_XFER_TYPE) - 1) | |
1faeff08 | 5186 | & -sizeof (PTRACE_XFER_TYPE)); |
224c3ddb | 5187 | buf = (char *) alloca (size); |
1faeff08 | 5188 | |
0bfdf32f | 5189 | pid = lwpid_of (current_thread); |
1faeff08 MR |
5190 | for (i = 0; i < size; i += sizeof (PTRACE_XFER_TYPE)) |
5191 | { | |
5192 | errno = 0; | |
5193 | *(PTRACE_XFER_TYPE *) (buf + i) = | |
5194 | ptrace (PTRACE_PEEKUSER, pid, | |
5195 | /* Coerce to a uintptr_t first to avoid potential gcc warning | |
5196 | of coercing an 8 byte integer to a 4 byte pointer. */ | |
b8e1b30e | 5197 | (PTRACE_TYPE_ARG3) (uintptr_t) regaddr, (PTRACE_TYPE_ARG4) 0); |
1faeff08 MR |
5198 | regaddr += sizeof (PTRACE_XFER_TYPE); |
5199 | if (errno != 0) | |
9a70f35c YQ |
5200 | { |
5201 | /* Mark register REGNO unavailable. */ | |
5202 | supply_register (regcache, regno, NULL); | |
5203 | return; | |
5204 | } | |
1faeff08 MR |
5205 | } |
5206 | ||
b35db733 | 5207 | low_supply_ptrace_register (regcache, regno, buf); |
1faeff08 MR |
5208 | } |
5209 | ||
daca57a7 TBA |
5210 | void |
5211 | linux_process_target::store_register (const usrregs_info *usrregs, | |
5212 | regcache *regcache, int regno) | |
1faeff08 MR |
5213 | { |
5214 | CORE_ADDR regaddr; | |
5215 | int i, size; | |
5216 | char *buf; | |
5217 | int pid; | |
5218 | ||
3aee8918 | 5219 | if (regno >= usrregs->num_regs) |
1faeff08 | 5220 | return; |
daca57a7 | 5221 | if (low_cannot_store_register (regno)) |
1faeff08 MR |
5222 | return; |
5223 | ||
3aee8918 | 5224 | regaddr = register_addr (usrregs, regno); |
1faeff08 MR |
5225 | if (regaddr == -1) |
5226 | return; | |
5227 | ||
3aee8918 PA |
5228 | size = ((register_size (regcache->tdesc, regno) |
5229 | + sizeof (PTRACE_XFER_TYPE) - 1) | |
1faeff08 | 5230 | & -sizeof (PTRACE_XFER_TYPE)); |
224c3ddb | 5231 | buf = (char *) alloca (size); |
1faeff08 MR |
5232 | memset (buf, 0, size); |
5233 | ||
b35db733 | 5234 | low_collect_ptrace_register (regcache, regno, buf); |
1faeff08 | 5235 | |
0bfdf32f | 5236 | pid = lwpid_of (current_thread); |
1faeff08 MR |
5237 | for (i = 0; i < size; i += sizeof (PTRACE_XFER_TYPE)) |
5238 | { | |
5239 | errno = 0; | |
5240 | ptrace (PTRACE_POKEUSER, pid, | |
5241 | /* Coerce to a uintptr_t first to avoid potential gcc warning | |
5242 | about coercing an 8 byte integer to a 4 byte pointer. */ | |
b8e1b30e LM |
5243 | (PTRACE_TYPE_ARG3) (uintptr_t) regaddr, |
5244 | (PTRACE_TYPE_ARG4) *(PTRACE_XFER_TYPE *) (buf + i)); | |
1faeff08 MR |
5245 | if (errno != 0) |
5246 | { | |
5247 | /* At this point, ESRCH should mean the process is | |
5248 | already gone, in which case we simply ignore attempts | |
5249 | to change its registers. See also the related | |
df95181f | 5250 | comment in resume_one_lwp. */ |
1faeff08 MR |
5251 | if (errno == ESRCH) |
5252 | return; | |
5253 | ||
daca57a7 TBA |
5254 | |
5255 | if (!low_cannot_store_register (regno)) | |
6d91ce9a | 5256 | error ("writing register %d: %s", regno, safe_strerror (errno)); |
1faeff08 MR |
5257 | } |
5258 | regaddr += sizeof (PTRACE_XFER_TYPE); | |
5259 | } | |
5260 | } | |
daca57a7 | 5261 | #endif /* HAVE_LINUX_USRREGS */ |
1faeff08 | 5262 | |
b35db733 TBA |
5263 | void |
5264 | linux_process_target::low_collect_ptrace_register (regcache *regcache, | |
5265 | int regno, char *buf) | |
5266 | { | |
5267 | collect_register (regcache, regno, buf); | |
5268 | } | |
5269 | ||
5270 | void | |
5271 | linux_process_target::low_supply_ptrace_register (regcache *regcache, | |
5272 | int regno, const char *buf) | |
5273 | { | |
5274 | supply_register (regcache, regno, buf); | |
5275 | } | |
5276 | ||
daca57a7 TBA |
5277 | void |
5278 | linux_process_target::usr_fetch_inferior_registers (const regs_info *regs_info, | |
5279 | regcache *regcache, | |
5280 | int regno, int all) | |
1faeff08 | 5281 | { |
daca57a7 | 5282 | #ifdef HAVE_LINUX_USRREGS |
3aee8918 PA |
5283 | struct usrregs_info *usr = regs_info->usrregs; |
5284 | ||
1faeff08 MR |
5285 | if (regno == -1) |
5286 | { | |
3aee8918 PA |
5287 | for (regno = 0; regno < usr->num_regs; regno++) |
5288 | if (all || !linux_register_in_regsets (regs_info, regno)) | |
5289 | fetch_register (usr, regcache, regno); | |
1faeff08 MR |
5290 | } |
5291 | else | |
3aee8918 | 5292 | fetch_register (usr, regcache, regno); |
daca57a7 | 5293 | #endif |
1faeff08 MR |
5294 | } |
5295 | ||
daca57a7 TBA |
5296 | void |
5297 | linux_process_target::usr_store_inferior_registers (const regs_info *regs_info, | |
5298 | regcache *regcache, | |
5299 | int regno, int all) | |
1faeff08 | 5300 | { |
daca57a7 | 5301 | #ifdef HAVE_LINUX_USRREGS |
3aee8918 PA |
5302 | struct usrregs_info *usr = regs_info->usrregs; |
5303 | ||
1faeff08 MR |
5304 | if (regno == -1) |
5305 | { | |
3aee8918 PA |
5306 | for (regno = 0; regno < usr->num_regs; regno++) |
5307 | if (all || !linux_register_in_regsets (regs_info, regno)) | |
5308 | store_register (usr, regcache, regno); | |
1faeff08 MR |
5309 | } |
5310 | else | |
3aee8918 | 5311 | store_register (usr, regcache, regno); |
58caa3dc | 5312 | #endif |
daca57a7 | 5313 | } |
1faeff08 | 5314 | |
a5a4d4cd TBA |
5315 | void |
5316 | linux_process_target::fetch_registers (regcache *regcache, int regno) | |
1faeff08 MR |
5317 | { |
5318 | int use_regsets; | |
5319 | int all = 0; | |
aa8d21c9 | 5320 | const regs_info *regs_info = get_regs_info (); |
1faeff08 MR |
5321 | |
5322 | if (regno == -1) | |
5323 | { | |
bd70b1f2 | 5324 | if (regs_info->usrregs != NULL) |
3aee8918 | 5325 | for (regno = 0; regno < regs_info->usrregs->num_regs; regno++) |
bd70b1f2 | 5326 | low_fetch_register (regcache, regno); |
c14dfd32 | 5327 | |
3aee8918 PA |
5328 | all = regsets_fetch_inferior_registers (regs_info->regsets_info, regcache); |
5329 | if (regs_info->usrregs != NULL) | |
5330 | usr_fetch_inferior_registers (regs_info, regcache, -1, all); | |
1faeff08 MR |
5331 | } |
5332 | else | |
5333 | { | |
bd70b1f2 | 5334 | if (low_fetch_register (regcache, regno)) |
c14dfd32 PA |
5335 | return; |
5336 | ||
3aee8918 | 5337 | use_regsets = linux_register_in_regsets (regs_info, regno); |
1faeff08 | 5338 | if (use_regsets) |
3aee8918 PA |
5339 | all = regsets_fetch_inferior_registers (regs_info->regsets_info, |
5340 | regcache); | |
5341 | if ((!use_regsets || all) && regs_info->usrregs != NULL) | |
5342 | usr_fetch_inferior_registers (regs_info, regcache, regno, 1); | |
1faeff08 | 5343 | } |
58caa3dc DJ |
5344 | } |
5345 | ||
a5a4d4cd TBA |
5346 | void |
5347 | linux_process_target::store_registers (regcache *regcache, int regno) | |
58caa3dc | 5348 | { |
1faeff08 MR |
5349 | int use_regsets; |
5350 | int all = 0; | |
aa8d21c9 | 5351 | const regs_info *regs_info = get_regs_info (); |
1faeff08 MR |
5352 | |
5353 | if (regno == -1) | |
5354 | { | |
3aee8918 PA |
5355 | all = regsets_store_inferior_registers (regs_info->regsets_info, |
5356 | regcache); | |
5357 | if (regs_info->usrregs != NULL) | |
5358 | usr_store_inferior_registers (regs_info, regcache, regno, all); | |
1faeff08 MR |
5359 | } |
5360 | else | |
5361 | { | |
3aee8918 | 5362 | use_regsets = linux_register_in_regsets (regs_info, regno); |
1faeff08 | 5363 | if (use_regsets) |
3aee8918 PA |
5364 | all = regsets_store_inferior_registers (regs_info->regsets_info, |
5365 | regcache); | |
5366 | if ((!use_regsets || all) && regs_info->usrregs != NULL) | |
5367 | usr_store_inferior_registers (regs_info, regcache, regno, 1); | |
1faeff08 | 5368 | } |
58caa3dc DJ |
5369 | } |
5370 | ||
bd70b1f2 TBA |
5371 | bool |
5372 | linux_process_target::low_fetch_register (regcache *regcache, int regno) | |
5373 | { | |
5374 | return false; | |
5375 | } | |
da6d8c04 | 5376 | |
e2558df3 | 5377 | /* A wrapper for the read_memory target op. */ |
da6d8c04 | 5378 | |
c3e735a6 | 5379 | static int |
f450004a | 5380 | linux_read_memory (CORE_ADDR memaddr, unsigned char *myaddr, int len) |
e2558df3 | 5381 | { |
52405d85 | 5382 | return the_target->read_memory (memaddr, myaddr, len); |
e2558df3 TBA |
5383 | } |
5384 | ||
e2558df3 | 5385 | |
421490af PA |
5386 | /* Helper for read_memory/write_memory using /proc/PID/mem. Because |
5387 | we can use a single read/write call, this can be much more | |
5388 | efficient than banging away at PTRACE_PEEKTEXT. Also, unlike | |
5389 | PTRACE_PEEKTEXT/PTRACE_POKETEXT, this works with running threads. | |
5390 | One an only one of READBUF and WRITEBUF is non-null. If READBUF is | |
5391 | not null, then we're reading, otherwise we're writing. */ | |
5392 | ||
5393 | static int | |
5394 | proc_xfer_memory (CORE_ADDR memaddr, unsigned char *readbuf, | |
5395 | const gdb_byte *writebuf, int len) | |
da6d8c04 | 5396 | { |
421490af | 5397 | gdb_assert ((readbuf == nullptr) != (writebuf == nullptr)); |
fd462a61 | 5398 | |
421490af PA |
5399 | process_info *proc = current_process (); |
5400 | ||
5401 | int fd = proc->priv->mem_fd; | |
5402 | if (fd == -1) | |
5403 | return EIO; | |
5404 | ||
5405 | while (len > 0) | |
fd462a61 | 5406 | { |
4934b29e MR |
5407 | int bytes; |
5408 | ||
31a56a22 PA |
5409 | /* Use pread64/pwrite64 if available, since they save a syscall |
5410 | and can handle 64-bit offsets even on 32-bit platforms (for | |
5411 | instance, SPARC debugging a SPARC64 application). But only | |
5412 | use them if the offset isn't so high that when cast to off_t | |
5413 | it'd be negative, as seen on SPARC64. pread64/pwrite64 | |
5414 | outright reject such offsets. lseek does not. */ | |
fd462a61 | 5415 | #ifdef HAVE_PREAD64 |
31a56a22 | 5416 | if ((off_t) memaddr >= 0) |
421490af | 5417 | bytes = (readbuf != nullptr |
31a56a22 PA |
5418 | ? pread64 (fd, readbuf, len, memaddr) |
5419 | : pwrite64 (fd, writebuf, len, memaddr)); | |
5420 | else | |
fd462a61 | 5421 | #endif |
31a56a22 PA |
5422 | { |
5423 | bytes = -1; | |
5424 | if (lseek (fd, memaddr, SEEK_SET) != -1) | |
5425 | bytes = (readbuf != nullptr | |
5426 | ? read (fd, readbuf, len) | |
5427 | : write (fd, writebuf, len)); | |
5428 | } | |
fd462a61 | 5429 | |
421490af PA |
5430 | if (bytes < 0) |
5431 | return errno; | |
5432 | else if (bytes == 0) | |
4934b29e | 5433 | { |
421490af PA |
5434 | /* EOF means the address space is gone, the whole process |
5435 | exited or execed. */ | |
5436 | return EIO; | |
4934b29e | 5437 | } |
da6d8c04 | 5438 | |
421490af PA |
5439 | memaddr += bytes; |
5440 | if (readbuf != nullptr) | |
5441 | readbuf += bytes; | |
5442 | else | |
5443 | writebuf += bytes; | |
5444 | len -= bytes; | |
da6d8c04 DJ |
5445 | } |
5446 | ||
421490af PA |
5447 | return 0; |
5448 | } | |
c3e735a6 | 5449 | |
421490af PA |
5450 | int |
5451 | linux_process_target::read_memory (CORE_ADDR memaddr, | |
5452 | unsigned char *myaddr, int len) | |
5453 | { | |
5454 | return proc_xfer_memory (memaddr, myaddr, nullptr, len); | |
da6d8c04 DJ |
5455 | } |
5456 | ||
93ae6fdc PA |
5457 | /* Copy LEN bytes of data from debugger memory at MYADDR to inferior's |
5458 | memory at MEMADDR. On failure (cannot write to the inferior) | |
f0ae6fc3 | 5459 | returns the value of errno. Always succeeds if LEN is zero. */ |
da6d8c04 | 5460 | |
e2558df3 TBA |
5461 | int |
5462 | linux_process_target::write_memory (CORE_ADDR memaddr, | |
5463 | const unsigned char *myaddr, int len) | |
da6d8c04 | 5464 | { |
0d62e5e8 DJ |
5465 | if (debug_threads) |
5466 | { | |
58d6951d | 5467 | /* Dump up to four bytes. */ |
bf47e248 PA |
5468 | char str[4 * 2 + 1]; |
5469 | char *p = str; | |
5470 | int dump = len < 4 ? len : 4; | |
5471 | ||
421490af | 5472 | for (int i = 0; i < dump; i++) |
bf47e248 PA |
5473 | { |
5474 | sprintf (p, "%02x", myaddr[i]); | |
5475 | p += 2; | |
5476 | } | |
5477 | *p = '\0'; | |
5478 | ||
c058728c | 5479 | threads_debug_printf ("Writing %s to 0x%08lx in process %d", |
421490af | 5480 | str, (long) memaddr, current_process ()->pid); |
0d62e5e8 DJ |
5481 | } |
5482 | ||
421490af | 5483 | return proc_xfer_memory (memaddr, nullptr, myaddr, len); |
da6d8c04 | 5484 | } |
2f2893d9 | 5485 | |
2a31c7aa TBA |
5486 | void |
5487 | linux_process_target::look_up_symbols () | |
2f2893d9 | 5488 | { |
0d62e5e8 | 5489 | #ifdef USE_THREAD_DB |
95954743 PA |
5490 | struct process_info *proc = current_process (); |
5491 | ||
fe978cb0 | 5492 | if (proc->priv->thread_db != NULL) |
0d62e5e8 DJ |
5493 | return; |
5494 | ||
9b4c5f87 | 5495 | thread_db_init (); |
0d62e5e8 DJ |
5496 | #endif |
5497 | } | |
5498 | ||
eb497a2a TBA |
5499 | void |
5500 | linux_process_target::request_interrupt () | |
e5379b03 | 5501 | { |
78708b7c PA |
5502 | /* Send a SIGINT to the process group. This acts just like the user |
5503 | typed a ^C on the controlling terminal. */ | |
4c35c4c6 TV |
5504 | int res = ::kill (-signal_pid, SIGINT); |
5505 | if (res == -1) | |
5506 | warning (_("Sending SIGINT to process group of pid %ld failed: %s"), | |
5507 | signal_pid, safe_strerror (errno)); | |
e5379b03 DJ |
5508 | } |
5509 | ||
eac215cc TBA |
5510 | bool |
5511 | linux_process_target::supports_read_auxv () | |
5512 | { | |
5513 | return true; | |
5514 | } | |
5515 | ||
aa691b87 RM |
5516 | /* Copy LEN bytes from inferior's auxiliary vector starting at OFFSET |
5517 | to debugger memory starting at MYADDR. */ | |
5518 | ||
eac215cc | 5519 | int |
43e5fbd8 TJB |
5520 | linux_process_target::read_auxv (int pid, CORE_ADDR offset, |
5521 | unsigned char *myaddr, unsigned int len) | |
aa691b87 RM |
5522 | { |
5523 | char filename[PATH_MAX]; | |
5524 | int fd, n; | |
5525 | ||
6cebaf6e | 5526 | xsnprintf (filename, sizeof filename, "/proc/%d/auxv", pid); |
aa691b87 RM |
5527 | |
5528 | fd = open (filename, O_RDONLY); | |
5529 | if (fd < 0) | |
5530 | return -1; | |
5531 | ||
5532 | if (offset != (CORE_ADDR) 0 | |
5533 | && lseek (fd, (off_t) offset, SEEK_SET) != (off_t) offset) | |
5534 | n = -1; | |
5535 | else | |
5536 | n = read (fd, myaddr, len); | |
5537 | ||
5538 | close (fd); | |
5539 | ||
5540 | return n; | |
5541 | } | |
5542 | ||
7e0bde70 TBA |
5543 | int |
5544 | linux_process_target::insert_point (enum raw_bkpt_type type, CORE_ADDR addr, | |
5545 | int size, raw_breakpoint *bp) | |
e013ee27 | 5546 | { |
c8f4bfdd YQ |
5547 | if (type == raw_bkpt_type_sw) |
5548 | return insert_memory_breakpoint (bp); | |
e013ee27 | 5549 | else |
9db9aa23 TBA |
5550 | return low_insert_point (type, addr, size, bp); |
5551 | } | |
5552 | ||
5553 | int | |
5554 | linux_process_target::low_insert_point (raw_bkpt_type type, CORE_ADDR addr, | |
5555 | int size, raw_breakpoint *bp) | |
5556 | { | |
5557 | /* Unsupported (see target.h). */ | |
5558 | return 1; | |
e013ee27 OF |
5559 | } |
5560 | ||
7e0bde70 TBA |
5561 | int |
5562 | linux_process_target::remove_point (enum raw_bkpt_type type, CORE_ADDR addr, | |
5563 | int size, raw_breakpoint *bp) | |
e013ee27 | 5564 | { |
c8f4bfdd YQ |
5565 | if (type == raw_bkpt_type_sw) |
5566 | return remove_memory_breakpoint (bp); | |
e013ee27 | 5567 | else |
9db9aa23 TBA |
5568 | return low_remove_point (type, addr, size, bp); |
5569 | } | |
5570 | ||
5571 | int | |
5572 | linux_process_target::low_remove_point (raw_bkpt_type type, CORE_ADDR addr, | |
5573 | int size, raw_breakpoint *bp) | |
5574 | { | |
5575 | /* Unsupported (see target.h). */ | |
5576 | return 1; | |
e013ee27 OF |
5577 | } |
5578 | ||
84320c4e | 5579 | /* Implement the stopped_by_sw_breakpoint target_ops |
3e572f71 PA |
5580 | method. */ |
5581 | ||
84320c4e TBA |
5582 | bool |
5583 | linux_process_target::stopped_by_sw_breakpoint () | |
3e572f71 PA |
5584 | { |
5585 | struct lwp_info *lwp = get_thread_lwp (current_thread); | |
5586 | ||
5587 | return (lwp->stop_reason == TARGET_STOPPED_BY_SW_BREAKPOINT); | |
5588 | } | |
5589 | ||
84320c4e | 5590 | /* Implement the supports_stopped_by_sw_breakpoint target_ops |
3e572f71 PA |
5591 | method. */ |
5592 | ||
84320c4e TBA |
5593 | bool |
5594 | linux_process_target::supports_stopped_by_sw_breakpoint () | |
3e572f71 PA |
5595 | { |
5596 | return USE_SIGTRAP_SIGINFO; | |
5597 | } | |
5598 | ||
93fe88b2 | 5599 | /* Implement the stopped_by_hw_breakpoint target_ops |
3e572f71 PA |
5600 | method. */ |
5601 | ||
93fe88b2 TBA |
5602 | bool |
5603 | linux_process_target::stopped_by_hw_breakpoint () | |
3e572f71 PA |
5604 | { |
5605 | struct lwp_info *lwp = get_thread_lwp (current_thread); | |
5606 | ||
5607 | return (lwp->stop_reason == TARGET_STOPPED_BY_HW_BREAKPOINT); | |
5608 | } | |
5609 | ||
93fe88b2 | 5610 | /* Implement the supports_stopped_by_hw_breakpoint target_ops |
3e572f71 PA |
5611 | method. */ |
5612 | ||
93fe88b2 TBA |
5613 | bool |
5614 | linux_process_target::supports_stopped_by_hw_breakpoint () | |
3e572f71 PA |
5615 | { |
5616 | return USE_SIGTRAP_SIGINFO; | |
5617 | } | |
5618 | ||
70b90b91 | 5619 | /* Implement the supports_hardware_single_step target_ops method. */ |
45614f15 | 5620 | |
22aa6223 TBA |
5621 | bool |
5622 | linux_process_target::supports_hardware_single_step () | |
45614f15 | 5623 | { |
b31cdfa6 | 5624 | return true; |
45614f15 YQ |
5625 | } |
5626 | ||
6eeb5c55 TBA |
5627 | bool |
5628 | linux_process_target::stopped_by_watchpoint () | |
e013ee27 | 5629 | { |
0bfdf32f | 5630 | struct lwp_info *lwp = get_thread_lwp (current_thread); |
c3adc08c | 5631 | |
15c66dd6 | 5632 | return lwp->stop_reason == TARGET_STOPPED_BY_WATCHPOINT; |
e013ee27 OF |
5633 | } |
5634 | ||
6eeb5c55 TBA |
5635 | CORE_ADDR |
5636 | linux_process_target::stopped_data_address () | |
e013ee27 | 5637 | { |
0bfdf32f | 5638 | struct lwp_info *lwp = get_thread_lwp (current_thread); |
c3adc08c PA |
5639 | |
5640 | return lwp->stopped_data_address; | |
e013ee27 OF |
5641 | } |
5642 | ||
db0dfaa0 LM |
5643 | /* This is only used for targets that define PT_TEXT_ADDR, |
5644 | PT_DATA_ADDR and PT_TEXT_END_ADDR. If those are not defined, supposedly | |
5645 | the target has different ways of acquiring this information, like | |
5646 | loadmaps. */ | |
52fb6437 | 5647 | |
5203ae1e TBA |
5648 | bool |
5649 | linux_process_target::supports_read_offsets () | |
5650 | { | |
5651 | #ifdef SUPPORTS_READ_OFFSETS | |
5652 | return true; | |
5653 | #else | |
5654 | return false; | |
5655 | #endif | |
5656 | } | |
5657 | ||
52fb6437 NS |
5658 | /* Under uClinux, programs are loaded at non-zero offsets, which we need |
5659 | to tell gdb about. */ | |
5660 | ||
5203ae1e TBA |
5661 | int |
5662 | linux_process_target::read_offsets (CORE_ADDR *text_p, CORE_ADDR *data_p) | |
52fb6437 | 5663 | { |
5203ae1e | 5664 | #ifdef SUPPORTS_READ_OFFSETS |
52fb6437 | 5665 | unsigned long text, text_end, data; |
62828379 | 5666 | int pid = lwpid_of (current_thread); |
52fb6437 NS |
5667 | |
5668 | errno = 0; | |
5669 | ||
b8e1b30e LM |
5670 | text = ptrace (PTRACE_PEEKUSER, pid, (PTRACE_TYPE_ARG3) PT_TEXT_ADDR, |
5671 | (PTRACE_TYPE_ARG4) 0); | |
5672 | text_end = ptrace (PTRACE_PEEKUSER, pid, (PTRACE_TYPE_ARG3) PT_TEXT_END_ADDR, | |
5673 | (PTRACE_TYPE_ARG4) 0); | |
5674 | data = ptrace (PTRACE_PEEKUSER, pid, (PTRACE_TYPE_ARG3) PT_DATA_ADDR, | |
5675 | (PTRACE_TYPE_ARG4) 0); | |
52fb6437 NS |
5676 | |
5677 | if (errno == 0) | |
5678 | { | |
5679 | /* Both text and data offsets produced at compile-time (and so | |
1b3f6016 PA |
5680 | used by gdb) are relative to the beginning of the program, |
5681 | with the data segment immediately following the text segment. | |
5682 | However, the actual runtime layout in memory may put the data | |
5683 | somewhere else, so when we send gdb a data base-address, we | |
5684 | use the real data base address and subtract the compile-time | |
5685 | data base-address from it (which is just the length of the | |
5686 | text segment). BSS immediately follows data in both | |
5687 | cases. */ | |
52fb6437 NS |
5688 | *text_p = text; |
5689 | *data_p = data - (text_end - text); | |
1b3f6016 | 5690 | |
52fb6437 NS |
5691 | return 1; |
5692 | } | |
5203ae1e TBA |
5693 | return 0; |
5694 | #else | |
5695 | gdb_assert_not_reached ("target op read_offsets not supported"); | |
52fb6437 | 5696 | #endif |
5203ae1e | 5697 | } |
52fb6437 | 5698 | |
6e3fd7e9 TBA |
5699 | bool |
5700 | linux_process_target::supports_get_tls_address () | |
5701 | { | |
5702 | #ifdef USE_THREAD_DB | |
5703 | return true; | |
5704 | #else | |
5705 | return false; | |
5706 | #endif | |
5707 | } | |
5708 | ||
5709 | int | |
5710 | linux_process_target::get_tls_address (thread_info *thread, | |
5711 | CORE_ADDR offset, | |
5712 | CORE_ADDR load_module, | |
5713 | CORE_ADDR *address) | |
5714 | { | |
5715 | #ifdef USE_THREAD_DB | |
5716 | return thread_db_get_tls_address (thread, offset, load_module, address); | |
5717 | #else | |
5718 | return -1; | |
5719 | #endif | |
5720 | } | |
5721 | ||
2d0795ee TBA |
5722 | bool |
5723 | linux_process_target::supports_qxfer_osdata () | |
5724 | { | |
5725 | return true; | |
5726 | } | |
5727 | ||
5728 | int | |
5729 | linux_process_target::qxfer_osdata (const char *annex, | |
5730 | unsigned char *readbuf, | |
5731 | unsigned const char *writebuf, | |
5732 | CORE_ADDR offset, int len) | |
07e059b5 | 5733 | { |
d26e3629 | 5734 | return linux_common_xfer_osdata (annex, readbuf, offset, len); |
07e059b5 VP |
5735 | } |
5736 | ||
cb63de7c TBA |
5737 | void |
5738 | linux_process_target::siginfo_fixup (siginfo_t *siginfo, | |
5739 | gdb_byte *inf_siginfo, int direction) | |
d0722149 | 5740 | { |
cb63de7c | 5741 | bool done = low_siginfo_fixup (siginfo, inf_siginfo, direction); |
d0722149 DE |
5742 | |
5743 | /* If there was no callback, or the callback didn't do anything, | |
5744 | then just do a straight memcpy. */ | |
5745 | if (!done) | |
5746 | { | |
5747 | if (direction == 1) | |
a5362b9a | 5748 | memcpy (siginfo, inf_siginfo, sizeof (siginfo_t)); |
d0722149 | 5749 | else |
a5362b9a | 5750 | memcpy (inf_siginfo, siginfo, sizeof (siginfo_t)); |
d0722149 DE |
5751 | } |
5752 | } | |
5753 | ||
cb63de7c TBA |
5754 | bool |
5755 | linux_process_target::low_siginfo_fixup (siginfo_t *native, gdb_byte *inf, | |
5756 | int direction) | |
5757 | { | |
5758 | return false; | |
5759 | } | |
5760 | ||
d7abedf7 TBA |
5761 | bool |
5762 | linux_process_target::supports_qxfer_siginfo () | |
5763 | { | |
5764 | return true; | |
5765 | } | |
5766 | ||
5767 | int | |
5768 | linux_process_target::qxfer_siginfo (const char *annex, | |
5769 | unsigned char *readbuf, | |
5770 | unsigned const char *writebuf, | |
5771 | CORE_ADDR offset, int len) | |
4aa995e1 | 5772 | { |
d0722149 | 5773 | int pid; |
a5362b9a | 5774 | siginfo_t siginfo; |
8adce034 | 5775 | gdb_byte inf_siginfo[sizeof (siginfo_t)]; |
4aa995e1 | 5776 | |
0bfdf32f | 5777 | if (current_thread == NULL) |
4aa995e1 PA |
5778 | return -1; |
5779 | ||
0bfdf32f | 5780 | pid = lwpid_of (current_thread); |
4aa995e1 | 5781 | |
c058728c SM |
5782 | threads_debug_printf ("%s siginfo for lwp %d.", |
5783 | readbuf != NULL ? "Reading" : "Writing", | |
5784 | pid); | |
4aa995e1 | 5785 | |
0adea5f7 | 5786 | if (offset >= sizeof (siginfo)) |
4aa995e1 PA |
5787 | return -1; |
5788 | ||
b8e1b30e | 5789 | if (ptrace (PTRACE_GETSIGINFO, pid, (PTRACE_TYPE_ARG3) 0, &siginfo) != 0) |
4aa995e1 PA |
5790 | return -1; |
5791 | ||
d0722149 DE |
5792 | /* When GDBSERVER is built as a 64-bit application, ptrace writes into |
5793 | SIGINFO an object with 64-bit layout. Since debugging a 32-bit | |
5794 | inferior with a 64-bit GDBSERVER should look the same as debugging it | |
5795 | with a 32-bit GDBSERVER, we need to convert it. */ | |
5796 | siginfo_fixup (&siginfo, inf_siginfo, 0); | |
5797 | ||
4aa995e1 PA |
5798 | if (offset + len > sizeof (siginfo)) |
5799 | len = sizeof (siginfo) - offset; | |
5800 | ||
5801 | if (readbuf != NULL) | |
d0722149 | 5802 | memcpy (readbuf, inf_siginfo + offset, len); |
4aa995e1 PA |
5803 | else |
5804 | { | |
d0722149 DE |
5805 | memcpy (inf_siginfo + offset, writebuf, len); |
5806 | ||
5807 | /* Convert back to ptrace layout before flushing it out. */ | |
5808 | siginfo_fixup (&siginfo, inf_siginfo, 1); | |
5809 | ||
b8e1b30e | 5810 | if (ptrace (PTRACE_SETSIGINFO, pid, (PTRACE_TYPE_ARG3) 0, &siginfo) != 0) |
4aa995e1 PA |
5811 | return -1; |
5812 | } | |
5813 | ||
5814 | return len; | |
5815 | } | |
5816 | ||
bd99dc85 PA |
5817 | /* SIGCHLD handler that serves two purposes: In non-stop/async mode, |
5818 | so we notice when children change state; as the handler for the | |
5819 | sigsuspend in my_waitpid. */ | |
5820 | ||
5821 | static void | |
5822 | sigchld_handler (int signo) | |
5823 | { | |
5824 | int old_errno = errno; | |
5825 | ||
5826 | if (debug_threads) | |
e581f2b4 PA |
5827 | { |
5828 | do | |
5829 | { | |
a7e559cc AH |
5830 | /* Use the async signal safe debug function. */ |
5831 | if (debug_write ("sigchld_handler\n", | |
5832 | sizeof ("sigchld_handler\n") - 1) < 0) | |
e581f2b4 PA |
5833 | break; /* just ignore */ |
5834 | } while (0); | |
5835 | } | |
bd99dc85 PA |
5836 | |
5837 | if (target_is_async_p ()) | |
5838 | async_file_mark (); /* trigger a linux_wait */ | |
5839 | ||
5840 | errno = old_errno; | |
5841 | } | |
5842 | ||
0dc587d4 TBA |
5843 | bool |
5844 | linux_process_target::supports_non_stop () | |
bd99dc85 | 5845 | { |
0dc587d4 | 5846 | return true; |
bd99dc85 PA |
5847 | } |
5848 | ||
0dc587d4 TBA |
5849 | bool |
5850 | linux_process_target::async (bool enable) | |
bd99dc85 | 5851 | { |
0dc587d4 | 5852 | bool previous = target_is_async_p (); |
bd99dc85 | 5853 | |
c058728c SM |
5854 | threads_debug_printf ("async (%d), previous=%d", |
5855 | enable, previous); | |
8336d594 | 5856 | |
bd99dc85 PA |
5857 | if (previous != enable) |
5858 | { | |
5859 | sigset_t mask; | |
5860 | sigemptyset (&mask); | |
5861 | sigaddset (&mask, SIGCHLD); | |
5862 | ||
21987b9c | 5863 | gdb_sigmask (SIG_BLOCK, &mask, NULL); |
bd99dc85 PA |
5864 | |
5865 | if (enable) | |
5866 | { | |
8674f082 | 5867 | if (!linux_event_pipe.open_pipe ()) |
aa96c426 | 5868 | { |
21987b9c | 5869 | gdb_sigmask (SIG_UNBLOCK, &mask, NULL); |
aa96c426 GB |
5870 | |
5871 | warning ("creating event pipe failed."); | |
5872 | return previous; | |
5873 | } | |
bd99dc85 | 5874 | |
bd99dc85 | 5875 | /* Register the event loop handler. */ |
cdc8e9b2 | 5876 | add_file_handler (linux_event_pipe.event_fd (), |
2554f6f5 SM |
5877 | handle_target_event, NULL, |
5878 | "linux-low"); | |
bd99dc85 PA |
5879 | |
5880 | /* Always trigger a linux_wait. */ | |
5881 | async_file_mark (); | |
5882 | } | |
5883 | else | |
5884 | { | |
cdc8e9b2 | 5885 | delete_file_handler (linux_event_pipe.event_fd ()); |
bd99dc85 | 5886 | |
8674f082 | 5887 | linux_event_pipe.close_pipe (); |
bd99dc85 PA |
5888 | } |
5889 | ||
21987b9c | 5890 | gdb_sigmask (SIG_UNBLOCK, &mask, NULL); |
bd99dc85 PA |
5891 | } |
5892 | ||
5893 | return previous; | |
5894 | } | |
5895 | ||
0dc587d4 TBA |
5896 | int |
5897 | linux_process_target::start_non_stop (bool nonstop) | |
bd99dc85 PA |
5898 | { |
5899 | /* Register or unregister from event-loop accordingly. */ | |
0dc587d4 | 5900 | target_async (nonstop); |
aa96c426 | 5901 | |
0dc587d4 | 5902 | if (target_is_async_p () != (nonstop != false)) |
aa96c426 GB |
5903 | return -1; |
5904 | ||
bd99dc85 PA |
5905 | return 0; |
5906 | } | |
5907 | ||
652aef77 TBA |
5908 | bool |
5909 | linux_process_target::supports_multi_process () | |
cf8fd78b | 5910 | { |
652aef77 | 5911 | return true; |
cf8fd78b PA |
5912 | } |
5913 | ||
89245bc0 DB |
5914 | /* Check if fork events are supported. */ |
5915 | ||
9690a72a TBA |
5916 | bool |
5917 | linux_process_target::supports_fork_events () | |
89245bc0 | 5918 | { |
a2885186 | 5919 | return true; |
89245bc0 DB |
5920 | } |
5921 | ||
5922 | /* Check if vfork events are supported. */ | |
5923 | ||
9690a72a TBA |
5924 | bool |
5925 | linux_process_target::supports_vfork_events () | |
89245bc0 | 5926 | { |
a2885186 | 5927 | return true; |
89245bc0 DB |
5928 | } |
5929 | ||
393a6b59 PA |
5930 | /* Return the set of supported thread options. */ |
5931 | ||
5932 | gdb_thread_options | |
5933 | linux_process_target::supported_thread_options () | |
5934 | { | |
48989498 | 5935 | return GDB_THREAD_OPTION_CLONE | GDB_THREAD_OPTION_EXIT; |
393a6b59 PA |
5936 | } |
5937 | ||
94585166 DB |
5938 | /* Check if exec events are supported. */ |
5939 | ||
9690a72a TBA |
5940 | bool |
5941 | linux_process_target::supports_exec_events () | |
94585166 | 5942 | { |
a2885186 | 5943 | return true; |
94585166 DB |
5944 | } |
5945 | ||
de0d863e DB |
5946 | /* Target hook for 'handle_new_gdb_connection'. Causes a reset of the |
5947 | ptrace flags for all inferiors. This is in case the new GDB connection | |
5948 | doesn't support the same set of events that the previous one did. */ | |
5949 | ||
fb00dfce TBA |
5950 | void |
5951 | linux_process_target::handle_new_gdb_connection () | |
de0d863e | 5952 | { |
de0d863e | 5953 | /* Request that all the lwps reset their ptrace options. */ |
bbf550d5 SM |
5954 | for_each_thread ([] (thread_info *thread) |
5955 | { | |
5956 | struct lwp_info *lwp = get_thread_lwp (thread); | |
5957 | ||
5958 | if (!lwp->stopped) | |
5959 | { | |
5960 | /* Stop the lwp so we can modify its ptrace options. */ | |
5961 | lwp->must_set_ptrace_flags = 1; | |
5962 | linux_stop_lwp (lwp); | |
5963 | } | |
5964 | else | |
5965 | { | |
5966 | /* Already stopped; go ahead and set the ptrace options. */ | |
5967 | struct process_info *proc = find_process_pid (pid_of (thread)); | |
5968 | int options = linux_low_ptrace_options (proc->attached); | |
5969 | ||
5970 | linux_enable_event_reporting (lwpid_of (thread), options); | |
5971 | lwp->must_set_ptrace_flags = 0; | |
5972 | } | |
5973 | }); | |
de0d863e DB |
5974 | } |
5975 | ||
55cf3021 TBA |
5976 | int |
5977 | linux_process_target::handle_monitor_command (char *mon) | |
5978 | { | |
5979 | #ifdef USE_THREAD_DB | |
5980 | return thread_db_handle_monitor_command (mon); | |
5981 | #else | |
5982 | return 0; | |
5983 | #endif | |
5984 | } | |
5985 | ||
95a45fc1 TBA |
5986 | int |
5987 | linux_process_target::core_of_thread (ptid_t ptid) | |
5988 | { | |
5989 | return linux_common_core_of_thread (ptid); | |
5990 | } | |
5991 | ||
c756403b TBA |
5992 | bool |
5993 | linux_process_target::supports_disable_randomization () | |
03583c20 | 5994 | { |
c756403b | 5995 | return true; |
03583c20 | 5996 | } |
efcbbd14 | 5997 | |
c0245cb9 TBA |
5998 | bool |
5999 | linux_process_target::supports_agent () | |
d1feda86 | 6000 | { |
c0245cb9 | 6001 | return true; |
d1feda86 YQ |
6002 | } |
6003 | ||
2526e0cd TBA |
6004 | bool |
6005 | linux_process_target::supports_range_stepping () | |
c2d6af84 | 6006 | { |
7582c77c | 6007 | if (supports_software_single_step ()) |
2526e0cd | 6008 | return true; |
c2d6af84 | 6009 | |
9cfd8715 TBA |
6010 | return low_supports_range_stepping (); |
6011 | } | |
6012 | ||
6013 | bool | |
6014 | linux_process_target::low_supports_range_stepping () | |
6015 | { | |
6016 | return false; | |
c2d6af84 PA |
6017 | } |
6018 | ||
8247b823 TBA |
6019 | bool |
6020 | linux_process_target::supports_pid_to_exec_file () | |
6021 | { | |
6022 | return true; | |
6023 | } | |
6024 | ||
04977957 | 6025 | const char * |
8247b823 TBA |
6026 | linux_process_target::pid_to_exec_file (int pid) |
6027 | { | |
6028 | return linux_proc_pid_to_exec_file (pid); | |
6029 | } | |
6030 | ||
c9b7b804 TBA |
6031 | bool |
6032 | linux_process_target::supports_multifs () | |
6033 | { | |
6034 | return true; | |
6035 | } | |
6036 | ||
6037 | int | |
6038 | linux_process_target::multifs_open (int pid, const char *filename, | |
6039 | int flags, mode_t mode) | |
6040 | { | |
6041 | return linux_mntns_open_cloexec (pid, filename, flags, mode); | |
6042 | } | |
6043 | ||
6044 | int | |
6045 | linux_process_target::multifs_unlink (int pid, const char *filename) | |
6046 | { | |
6047 | return linux_mntns_unlink (pid, filename); | |
6048 | } | |
6049 | ||
6050 | ssize_t | |
6051 | linux_process_target::multifs_readlink (int pid, const char *filename, | |
6052 | char *buf, size_t bufsiz) | |
6053 | { | |
6054 | return linux_mntns_readlink (pid, filename, buf, bufsiz); | |
6055 | } | |
6056 | ||
723b724b | 6057 | #if defined PT_GETDSBT || defined PTRACE_GETFDPIC |
78d85199 YQ |
6058 | struct target_loadseg |
6059 | { | |
6060 | /* Core address to which the segment is mapped. */ | |
6061 | Elf32_Addr addr; | |
6062 | /* VMA recorded in the program header. */ | |
6063 | Elf32_Addr p_vaddr; | |
6064 | /* Size of this segment in memory. */ | |
6065 | Elf32_Word p_memsz; | |
6066 | }; | |
6067 | ||
723b724b | 6068 | # if defined PT_GETDSBT |
78d85199 YQ |
6069 | struct target_loadmap |
6070 | { | |
6071 | /* Protocol version number, must be zero. */ | |
6072 | Elf32_Word version; | |
6073 | /* Pointer to the DSBT table, its size, and the DSBT index. */ | |
6074 | unsigned *dsbt_table; | |
6075 | unsigned dsbt_size, dsbt_index; | |
6076 | /* Number of segments in this map. */ | |
6077 | Elf32_Word nsegs; | |
6078 | /* The actual memory map. */ | |
6079 | struct target_loadseg segs[/*nsegs*/]; | |
6080 | }; | |
723b724b MF |
6081 | # define LINUX_LOADMAP PT_GETDSBT |
6082 | # define LINUX_LOADMAP_EXEC PTRACE_GETDSBT_EXEC | |
6083 | # define LINUX_LOADMAP_INTERP PTRACE_GETDSBT_INTERP | |
6084 | # else | |
6085 | struct target_loadmap | |
6086 | { | |
6087 | /* Protocol version number, must be zero. */ | |
6088 | Elf32_Half version; | |
6089 | /* Number of segments in this map. */ | |
6090 | Elf32_Half nsegs; | |
6091 | /* The actual memory map. */ | |
6092 | struct target_loadseg segs[/*nsegs*/]; | |
6093 | }; | |
6094 | # define LINUX_LOADMAP PTRACE_GETFDPIC | |
6095 | # define LINUX_LOADMAP_EXEC PTRACE_GETFDPIC_EXEC | |
6096 | # define LINUX_LOADMAP_INTERP PTRACE_GETFDPIC_INTERP | |
6097 | # endif | |
78d85199 | 6098 | |
9da41fda TBA |
6099 | bool |
6100 | linux_process_target::supports_read_loadmap () | |
6101 | { | |
6102 | return true; | |
6103 | } | |
6104 | ||
6105 | int | |
6106 | linux_process_target::read_loadmap (const char *annex, CORE_ADDR offset, | |
6107 | unsigned char *myaddr, unsigned int len) | |
78d85199 | 6108 | { |
0bfdf32f | 6109 | int pid = lwpid_of (current_thread); |
78d85199 YQ |
6110 | int addr = -1; |
6111 | struct target_loadmap *data = NULL; | |
6112 | unsigned int actual_length, copy_length; | |
6113 | ||
6114 | if (strcmp (annex, "exec") == 0) | |
723b724b | 6115 | addr = (int) LINUX_LOADMAP_EXEC; |
78d85199 | 6116 | else if (strcmp (annex, "interp") == 0) |
723b724b | 6117 | addr = (int) LINUX_LOADMAP_INTERP; |
78d85199 YQ |
6118 | else |
6119 | return -1; | |
6120 | ||
723b724b | 6121 | if (ptrace (LINUX_LOADMAP, pid, addr, &data) != 0) |
78d85199 YQ |
6122 | return -1; |
6123 | ||
6124 | if (data == NULL) | |
6125 | return -1; | |
6126 | ||
6127 | actual_length = sizeof (struct target_loadmap) | |
6128 | + sizeof (struct target_loadseg) * data->nsegs; | |
6129 | ||
6130 | if (offset < 0 || offset > actual_length) | |
6131 | return -1; | |
6132 | ||
6133 | copy_length = actual_length - offset < len ? actual_length - offset : len; | |
6134 | memcpy (myaddr, (char *) data + offset, copy_length); | |
6135 | return copy_length; | |
6136 | } | |
723b724b | 6137 | #endif /* defined PT_GETDSBT || defined PTRACE_GETFDPIC */ |
78d85199 | 6138 | |
bc8d3ae4 TBA |
6139 | bool |
6140 | linux_process_target::supports_catch_syscall () | |
82075af2 | 6141 | { |
a2885186 | 6142 | return low_supports_catch_syscall (); |
82075af2 JS |
6143 | } |
6144 | ||
9eedd27d TBA |
6145 | bool |
6146 | linux_process_target::low_supports_catch_syscall () | |
6147 | { | |
6148 | return false; | |
6149 | } | |
6150 | ||
770d8f6a TBA |
6151 | CORE_ADDR |
6152 | linux_process_target::read_pc (regcache *regcache) | |
219f2f23 | 6153 | { |
bf9ae9d8 | 6154 | if (!low_supports_breakpoints ()) |
219f2f23 PA |
6155 | return 0; |
6156 | ||
bf9ae9d8 | 6157 | return low_get_pc (regcache); |
219f2f23 PA |
6158 | } |
6159 | ||
770d8f6a TBA |
6160 | void |
6161 | linux_process_target::write_pc (regcache *regcache, CORE_ADDR pc) | |
219f2f23 | 6162 | { |
bf9ae9d8 | 6163 | gdb_assert (low_supports_breakpoints ()); |
219f2f23 | 6164 | |
bf9ae9d8 | 6165 | low_set_pc (regcache, pc); |
219f2f23 PA |
6166 | } |
6167 | ||
68119632 TBA |
6168 | bool |
6169 | linux_process_target::supports_thread_stopped () | |
6170 | { | |
6171 | return true; | |
6172 | } | |
6173 | ||
6174 | bool | |
6175 | linux_process_target::thread_stopped (thread_info *thread) | |
8336d594 PA |
6176 | { |
6177 | return get_thread_lwp (thread)->stopped; | |
6178 | } | |
6179 | ||
6180 | /* This exposes stop-all-threads functionality to other modules. */ | |
6181 | ||
29e8dc09 TBA |
6182 | void |
6183 | linux_process_target::pause_all (bool freeze) | |
8336d594 | 6184 | { |
7984d532 PA |
6185 | stop_all_lwps (freeze, NULL); |
6186 | } | |
6187 | ||
6188 | /* This exposes unstop-all-threads functionality to other gdbserver | |
6189 | modules. */ | |
6190 | ||
29e8dc09 TBA |
6191 | void |
6192 | linux_process_target::unpause_all (bool unfreeze) | |
7984d532 PA |
6193 | { |
6194 | unstop_all_lwps (unfreeze, NULL); | |
8336d594 PA |
6195 | } |
6196 | ||
2268b414 JK |
6197 | /* Extract &phdr and num_phdr in the inferior. Return 0 on success. */ |
6198 | ||
6199 | static int | |
6200 | get_phdr_phnum_from_proc_auxv (const int pid, const int is_elf64, | |
6201 | CORE_ADDR *phdr_memaddr, int *num_phdr) | |
6202 | { | |
6203 | char filename[PATH_MAX]; | |
6204 | int fd; | |
6205 | const int auxv_size = is_elf64 | |
6206 | ? sizeof (Elf64_auxv_t) : sizeof (Elf32_auxv_t); | |
6207 | char buf[sizeof (Elf64_auxv_t)]; /* The larger of the two. */ | |
6208 | ||
6209 | xsnprintf (filename, sizeof filename, "/proc/%d/auxv", pid); | |
6210 | ||
6211 | fd = open (filename, O_RDONLY); | |
6212 | if (fd < 0) | |
6213 | return 1; | |
6214 | ||
6215 | *phdr_memaddr = 0; | |
6216 | *num_phdr = 0; | |
6217 | while (read (fd, buf, auxv_size) == auxv_size | |
6218 | && (*phdr_memaddr == 0 || *num_phdr == 0)) | |
6219 | { | |
6220 | if (is_elf64) | |
6221 | { | |
6222 | Elf64_auxv_t *const aux = (Elf64_auxv_t *) buf; | |
6223 | ||
6224 | switch (aux->a_type) | |
6225 | { | |
6226 | case AT_PHDR: | |
6227 | *phdr_memaddr = aux->a_un.a_val; | |
6228 | break; | |
6229 | case AT_PHNUM: | |
6230 | *num_phdr = aux->a_un.a_val; | |
6231 | break; | |
6232 | } | |
6233 | } | |
6234 | else | |
6235 | { | |
6236 | Elf32_auxv_t *const aux = (Elf32_auxv_t *) buf; | |
6237 | ||
6238 | switch (aux->a_type) | |
6239 | { | |
6240 | case AT_PHDR: | |
6241 | *phdr_memaddr = aux->a_un.a_val; | |
6242 | break; | |
6243 | case AT_PHNUM: | |
6244 | *num_phdr = aux->a_un.a_val; | |
6245 | break; | |
6246 | } | |
6247 | } | |
6248 | } | |
6249 | ||
6250 | close (fd); | |
6251 | ||
6252 | if (*phdr_memaddr == 0 || *num_phdr == 0) | |
6253 | { | |
6254 | warning ("Unexpected missing AT_PHDR and/or AT_PHNUM: " | |
6255 | "phdr_memaddr = %ld, phdr_num = %d", | |
6256 | (long) *phdr_memaddr, *num_phdr); | |
6257 | return 2; | |
6258 | } | |
6259 | ||
6260 | return 0; | |
6261 | } | |
6262 | ||
6263 | /* Return &_DYNAMIC (via PT_DYNAMIC) in the inferior, or 0 if not present. */ | |
6264 | ||
6265 | static CORE_ADDR | |
6266 | get_dynamic (const int pid, const int is_elf64) | |
6267 | { | |
6268 | CORE_ADDR phdr_memaddr, relocation; | |
db1ff28b | 6269 | int num_phdr, i; |
2268b414 | 6270 | unsigned char *phdr_buf; |
db1ff28b | 6271 | const int phdr_size = is_elf64 ? sizeof (Elf64_Phdr) : sizeof (Elf32_Phdr); |
2268b414 JK |
6272 | |
6273 | if (get_phdr_phnum_from_proc_auxv (pid, is_elf64, &phdr_memaddr, &num_phdr)) | |
6274 | return 0; | |
6275 | ||
6276 | gdb_assert (num_phdr < 100); /* Basic sanity check. */ | |
224c3ddb | 6277 | phdr_buf = (unsigned char *) alloca (num_phdr * phdr_size); |
2268b414 JK |
6278 | |
6279 | if (linux_read_memory (phdr_memaddr, phdr_buf, num_phdr * phdr_size)) | |
6280 | return 0; | |
6281 | ||
6282 | /* Compute relocation: it is expected to be 0 for "regular" executables, | |
6283 | non-zero for PIE ones. */ | |
6284 | relocation = -1; | |
db1ff28b JK |
6285 | for (i = 0; relocation == -1 && i < num_phdr; i++) |
6286 | if (is_elf64) | |
6287 | { | |
6288 | Elf64_Phdr *const p = (Elf64_Phdr *) (phdr_buf + i * phdr_size); | |
6289 | ||
6290 | if (p->p_type == PT_PHDR) | |
6291 | relocation = phdr_memaddr - p->p_vaddr; | |
6292 | } | |
6293 | else | |
6294 | { | |
6295 | Elf32_Phdr *const p = (Elf32_Phdr *) (phdr_buf + i * phdr_size); | |
6296 | ||
6297 | if (p->p_type == PT_PHDR) | |
6298 | relocation = phdr_memaddr - p->p_vaddr; | |
6299 | } | |
6300 | ||
2268b414 JK |
6301 | if (relocation == -1) |
6302 | { | |
e237a7e2 JK |
6303 | /* PT_PHDR is optional, but necessary for PIE in general. Fortunately |
6304 | any real world executables, including PIE executables, have always | |
6305 | PT_PHDR present. PT_PHDR is not present in some shared libraries or | |
6306 | in fpc (Free Pascal 2.4) binaries but neither of those have a need for | |
6307 | or present DT_DEBUG anyway (fpc binaries are statically linked). | |
6308 | ||
6309 | Therefore if there exists DT_DEBUG there is always also PT_PHDR. | |
6310 | ||
6311 | GDB could find RELOCATION also from AT_ENTRY - e_entry. */ | |
6312 | ||
2268b414 JK |
6313 | return 0; |
6314 | } | |
6315 | ||
db1ff28b JK |
6316 | for (i = 0; i < num_phdr; i++) |
6317 | { | |
6318 | if (is_elf64) | |
6319 | { | |
6320 | Elf64_Phdr *const p = (Elf64_Phdr *) (phdr_buf + i * phdr_size); | |
6321 | ||
6322 | if (p->p_type == PT_DYNAMIC) | |
6323 | return p->p_vaddr + relocation; | |
6324 | } | |
6325 | else | |
6326 | { | |
6327 | Elf32_Phdr *const p = (Elf32_Phdr *) (phdr_buf + i * phdr_size); | |
2268b414 | 6328 | |
db1ff28b JK |
6329 | if (p->p_type == PT_DYNAMIC) |
6330 | return p->p_vaddr + relocation; | |
6331 | } | |
6332 | } | |
2268b414 JK |
6333 | |
6334 | return 0; | |
6335 | } | |
6336 | ||
6337 | /* Return &_r_debug in the inferior, or -1 if not present. Return value | |
367ba2c2 MR |
6338 | can be 0 if the inferior does not yet have the library list initialized. |
6339 | We look for DT_MIPS_RLD_MAP first. MIPS executables use this instead of | |
6340 | DT_DEBUG, although they sometimes contain an unused DT_DEBUG entry too. */ | |
2268b414 JK |
6341 | |
6342 | static CORE_ADDR | |
6343 | get_r_debug (const int pid, const int is_elf64) | |
6344 | { | |
6345 | CORE_ADDR dynamic_memaddr; | |
6346 | const int dyn_size = is_elf64 ? sizeof (Elf64_Dyn) : sizeof (Elf32_Dyn); | |
6347 | unsigned char buf[sizeof (Elf64_Dyn)]; /* The larger of the two. */ | |
367ba2c2 | 6348 | CORE_ADDR map = -1; |
2268b414 JK |
6349 | |
6350 | dynamic_memaddr = get_dynamic (pid, is_elf64); | |
6351 | if (dynamic_memaddr == 0) | |
367ba2c2 | 6352 | return map; |
2268b414 JK |
6353 | |
6354 | while (linux_read_memory (dynamic_memaddr, buf, dyn_size) == 0) | |
6355 | { | |
6356 | if (is_elf64) | |
6357 | { | |
6358 | Elf64_Dyn *const dyn = (Elf64_Dyn *) buf; | |
a738da3a | 6359 | #if defined DT_MIPS_RLD_MAP || defined DT_MIPS_RLD_MAP_REL |
367ba2c2 MR |
6360 | union |
6361 | { | |
6362 | Elf64_Xword map; | |
6363 | unsigned char buf[sizeof (Elf64_Xword)]; | |
6364 | } | |
6365 | rld_map; | |
a738da3a MF |
6366 | #endif |
6367 | #ifdef DT_MIPS_RLD_MAP | |
367ba2c2 MR |
6368 | if (dyn->d_tag == DT_MIPS_RLD_MAP) |
6369 | { | |
6370 | if (linux_read_memory (dyn->d_un.d_val, | |
6371 | rld_map.buf, sizeof (rld_map.buf)) == 0) | |
6372 | return rld_map.map; | |
6373 | else | |
6374 | break; | |
6375 | } | |
75f62ce7 | 6376 | #endif /* DT_MIPS_RLD_MAP */ |
a738da3a MF |
6377 | #ifdef DT_MIPS_RLD_MAP_REL |
6378 | if (dyn->d_tag == DT_MIPS_RLD_MAP_REL) | |
6379 | { | |
6380 | if (linux_read_memory (dyn->d_un.d_val + dynamic_memaddr, | |
6381 | rld_map.buf, sizeof (rld_map.buf)) == 0) | |
6382 | return rld_map.map; | |
6383 | else | |
6384 | break; | |
6385 | } | |
6386 | #endif /* DT_MIPS_RLD_MAP_REL */ | |
2268b414 | 6387 | |
367ba2c2 MR |
6388 | if (dyn->d_tag == DT_DEBUG && map == -1) |
6389 | map = dyn->d_un.d_val; | |
2268b414 JK |
6390 | |
6391 | if (dyn->d_tag == DT_NULL) | |
6392 | break; | |
6393 | } | |
6394 | else | |
6395 | { | |
6396 | Elf32_Dyn *const dyn = (Elf32_Dyn *) buf; | |
a738da3a | 6397 | #if defined DT_MIPS_RLD_MAP || defined DT_MIPS_RLD_MAP_REL |
367ba2c2 MR |
6398 | union |
6399 | { | |
6400 | Elf32_Word map; | |
6401 | unsigned char buf[sizeof (Elf32_Word)]; | |
6402 | } | |
6403 | rld_map; | |
a738da3a MF |
6404 | #endif |
6405 | #ifdef DT_MIPS_RLD_MAP | |
367ba2c2 MR |
6406 | if (dyn->d_tag == DT_MIPS_RLD_MAP) |
6407 | { | |
6408 | if (linux_read_memory (dyn->d_un.d_val, | |
6409 | rld_map.buf, sizeof (rld_map.buf)) == 0) | |
6410 | return rld_map.map; | |
6411 | else | |
6412 | break; | |
6413 | } | |
75f62ce7 | 6414 | #endif /* DT_MIPS_RLD_MAP */ |
a738da3a MF |
6415 | #ifdef DT_MIPS_RLD_MAP_REL |
6416 | if (dyn->d_tag == DT_MIPS_RLD_MAP_REL) | |
6417 | { | |
6418 | if (linux_read_memory (dyn->d_un.d_val + dynamic_memaddr, | |
6419 | rld_map.buf, sizeof (rld_map.buf)) == 0) | |
6420 | return rld_map.map; | |
6421 | else | |
6422 | break; | |
6423 | } | |
6424 | #endif /* DT_MIPS_RLD_MAP_REL */ | |
2268b414 | 6425 | |
367ba2c2 MR |
6426 | if (dyn->d_tag == DT_DEBUG && map == -1) |
6427 | map = dyn->d_un.d_val; | |
2268b414 JK |
6428 | |
6429 | if (dyn->d_tag == DT_NULL) | |
6430 | break; | |
6431 | } | |
6432 | ||
6433 | dynamic_memaddr += dyn_size; | |
6434 | } | |
6435 | ||
367ba2c2 | 6436 | return map; |
2268b414 JK |
6437 | } |
6438 | ||
6439 | /* Read one pointer from MEMADDR in the inferior. */ | |
6440 | ||
6441 | static int | |
6442 | read_one_ptr (CORE_ADDR memaddr, CORE_ADDR *ptr, int ptr_size) | |
6443 | { | |
485f1ee4 PA |
6444 | int ret; |
6445 | ||
6446 | /* Go through a union so this works on either big or little endian | |
6447 | hosts, when the inferior's pointer size is smaller than the size | |
6448 | of CORE_ADDR. It is assumed the inferior's endianness is the | |
6449 | same of the superior's. */ | |
6450 | union | |
6451 | { | |
6452 | CORE_ADDR core_addr; | |
6453 | unsigned int ui; | |
6454 | unsigned char uc; | |
6455 | } addr; | |
6456 | ||
6457 | ret = linux_read_memory (memaddr, &addr.uc, ptr_size); | |
6458 | if (ret == 0) | |
6459 | { | |
6460 | if (ptr_size == sizeof (CORE_ADDR)) | |
6461 | *ptr = addr.core_addr; | |
6462 | else if (ptr_size == sizeof (unsigned int)) | |
6463 | *ptr = addr.ui; | |
6464 | else | |
6465 | gdb_assert_not_reached ("unhandled pointer size"); | |
6466 | } | |
6467 | return ret; | |
2268b414 JK |
6468 | } |
6469 | ||
974387bb TBA |
6470 | bool |
6471 | linux_process_target::supports_qxfer_libraries_svr4 () | |
6472 | { | |
6473 | return true; | |
6474 | } | |
6475 | ||
2268b414 JK |
6476 | struct link_map_offsets |
6477 | { | |
6478 | /* Offset and size of r_debug.r_version. */ | |
6479 | int r_version_offset; | |
6480 | ||
6481 | /* Offset and size of r_debug.r_map. */ | |
6482 | int r_map_offset; | |
6483 | ||
8d56636a MM |
6484 | /* Offset of r_debug_extended.r_next. */ |
6485 | int r_next_offset; | |
6486 | ||
2268b414 JK |
6487 | /* Offset to l_addr field in struct link_map. */ |
6488 | int l_addr_offset; | |
6489 | ||
6490 | /* Offset to l_name field in struct link_map. */ | |
6491 | int l_name_offset; | |
6492 | ||
6493 | /* Offset to l_ld field in struct link_map. */ | |
6494 | int l_ld_offset; | |
6495 | ||
6496 | /* Offset to l_next field in struct link_map. */ | |
6497 | int l_next_offset; | |
6498 | ||
6499 | /* Offset to l_prev field in struct link_map. */ | |
6500 | int l_prev_offset; | |
6501 | }; | |
6502 | ||
8d56636a MM |
6503 | static const link_map_offsets lmo_32bit_offsets = |
6504 | { | |
6505 | 0, /* r_version offset. */ | |
6506 | 4, /* r_debug.r_map offset. */ | |
6507 | 20, /* r_debug_extended.r_next. */ | |
6508 | 0, /* l_addr offset in link_map. */ | |
6509 | 4, /* l_name offset in link_map. */ | |
6510 | 8, /* l_ld offset in link_map. */ | |
6511 | 12, /* l_next offset in link_map. */ | |
6512 | 16 /* l_prev offset in link_map. */ | |
6513 | }; | |
6514 | ||
6515 | static const link_map_offsets lmo_64bit_offsets = | |
6516 | { | |
6517 | 0, /* r_version offset. */ | |
6518 | 8, /* r_debug.r_map offset. */ | |
6519 | 40, /* r_debug_extended.r_next. */ | |
6520 | 0, /* l_addr offset in link_map. */ | |
6521 | 8, /* l_name offset in link_map. */ | |
6522 | 16, /* l_ld offset in link_map. */ | |
6523 | 24, /* l_next offset in link_map. */ | |
6524 | 32 /* l_prev offset in link_map. */ | |
6525 | }; | |
6526 | ||
6527 | /* Get the loaded shared libraries from one namespace. */ | |
6528 | ||
6529 | static void | |
2733d9d5 MM |
6530 | read_link_map (std::string &document, CORE_ADDR lmid, CORE_ADDR lm_addr, |
6531 | CORE_ADDR lm_prev, int ptr_size, const link_map_offsets *lmo) | |
8d56636a MM |
6532 | { |
6533 | CORE_ADDR l_name, l_addr, l_ld, l_next, l_prev; | |
6534 | ||
6535 | while (lm_addr | |
6536 | && read_one_ptr (lm_addr + lmo->l_name_offset, | |
6537 | &l_name, ptr_size) == 0 | |
6538 | && read_one_ptr (lm_addr + lmo->l_addr_offset, | |
6539 | &l_addr, ptr_size) == 0 | |
6540 | && read_one_ptr (lm_addr + lmo->l_ld_offset, | |
6541 | &l_ld, ptr_size) == 0 | |
6542 | && read_one_ptr (lm_addr + lmo->l_prev_offset, | |
6543 | &l_prev, ptr_size) == 0 | |
6544 | && read_one_ptr (lm_addr + lmo->l_next_offset, | |
6545 | &l_next, ptr_size) == 0) | |
6546 | { | |
6547 | unsigned char libname[PATH_MAX]; | |
6548 | ||
6549 | if (lm_prev != l_prev) | |
6550 | { | |
6551 | warning ("Corrupted shared library list: 0x%s != 0x%s", | |
6552 | paddress (lm_prev), paddress (l_prev)); | |
6553 | break; | |
6554 | } | |
6555 | ||
ad10f44e MM |
6556 | /* Not checking for error because reading may stop before we've got |
6557 | PATH_MAX worth of characters. */ | |
6558 | libname[0] = '\0'; | |
6559 | linux_read_memory (l_name, libname, sizeof (libname) - 1); | |
6560 | libname[sizeof (libname) - 1] = '\0'; | |
6561 | if (libname[0] != '\0') | |
8d56636a | 6562 | { |
ad10f44e | 6563 | string_appendf (document, "<library name=\""); |
de75275f | 6564 | xml_escape_text_append (document, (char *) libname); |
ad10f44e | 6565 | string_appendf (document, "\" lm=\"0x%s\" l_addr=\"0x%s\" " |
2733d9d5 | 6566 | "l_ld=\"0x%s\" lmid=\"0x%s\"/>", |
ad10f44e | 6567 | paddress (lm_addr), paddress (l_addr), |
2733d9d5 | 6568 | paddress (l_ld), paddress (lmid)); |
8d56636a MM |
6569 | } |
6570 | ||
6571 | lm_prev = lm_addr; | |
6572 | lm_addr = l_next; | |
6573 | } | |
6574 | } | |
6575 | ||
fb723180 | 6576 | /* Construct qXfer:libraries-svr4:read reply. */ |
2268b414 | 6577 | |
974387bb TBA |
6578 | int |
6579 | linux_process_target::qxfer_libraries_svr4 (const char *annex, | |
6580 | unsigned char *readbuf, | |
6581 | unsigned const char *writebuf, | |
6582 | CORE_ADDR offset, int len) | |
2268b414 | 6583 | { |
fe978cb0 | 6584 | struct process_info_private *const priv = current_process ()->priv; |
2268b414 JK |
6585 | char filename[PATH_MAX]; |
6586 | int pid, is_elf64; | |
214d508e | 6587 | unsigned int machine; |
2733d9d5 | 6588 | CORE_ADDR lmid = 0, lm_addr = 0, lm_prev = 0; |
2268b414 JK |
6589 | |
6590 | if (writebuf != NULL) | |
6591 | return -2; | |
6592 | if (readbuf == NULL) | |
6593 | return -1; | |
6594 | ||
0bfdf32f | 6595 | pid = lwpid_of (current_thread); |
2268b414 | 6596 | xsnprintf (filename, sizeof filename, "/proc/%d/exe", pid); |
214d508e | 6597 | is_elf64 = elf_64_file_p (filename, &machine); |
8d56636a MM |
6598 | const link_map_offsets *lmo; |
6599 | int ptr_size; | |
6600 | if (is_elf64) | |
6601 | { | |
6602 | lmo = &lmo_64bit_offsets; | |
6603 | ptr_size = 8; | |
6604 | } | |
6605 | else | |
6606 | { | |
6607 | lmo = &lmo_32bit_offsets; | |
6608 | ptr_size = 4; | |
6609 | } | |
2268b414 | 6610 | |
b1fbec62 GB |
6611 | while (annex[0] != '\0') |
6612 | { | |
6613 | const char *sep; | |
6614 | CORE_ADDR *addrp; | |
da4ae14a | 6615 | int name_len; |
2268b414 | 6616 | |
b1fbec62 GB |
6617 | sep = strchr (annex, '='); |
6618 | if (sep == NULL) | |
6619 | break; | |
0c5bf5a9 | 6620 | |
da4ae14a | 6621 | name_len = sep - annex; |
2733d9d5 MM |
6622 | if (name_len == 4 && startswith (annex, "lmid")) |
6623 | addrp = &lmid; | |
6624 | else if (name_len == 5 && startswith (annex, "start")) | |
b1fbec62 | 6625 | addrp = &lm_addr; |
da4ae14a | 6626 | else if (name_len == 4 && startswith (annex, "prev")) |
b1fbec62 GB |
6627 | addrp = &lm_prev; |
6628 | else | |
6629 | { | |
6630 | annex = strchr (sep, ';'); | |
6631 | if (annex == NULL) | |
6632 | break; | |
6633 | annex++; | |
6634 | continue; | |
6635 | } | |
6636 | ||
6637 | annex = decode_address_to_semicolon (addrp, sep + 1); | |
2268b414 | 6638 | } |
b1fbec62 | 6639 | |
8d56636a MM |
6640 | std::string document = "<library-list-svr4 version=\"1.0\""; |
6641 | ||
6642 | /* When the starting LM_ADDR is passed in the annex, only traverse that | |
2733d9d5 | 6643 | namespace, which is assumed to be identified by LMID. |
8d56636a MM |
6644 | |
6645 | Otherwise, start with R_DEBUG and traverse all namespaces we find. */ | |
6646 | if (lm_addr != 0) | |
ad10f44e MM |
6647 | { |
6648 | document += ">"; | |
2733d9d5 | 6649 | read_link_map (document, lmid, lm_addr, lm_prev, ptr_size, lmo); |
ad10f44e | 6650 | } |
8d56636a | 6651 | else |
2268b414 | 6652 | { |
8d56636a MM |
6653 | if (lm_prev != 0) |
6654 | warning ("ignoring prev=0x%s without start", paddress (lm_prev)); | |
b1fbec62 | 6655 | |
2733d9d5 MM |
6656 | /* We could interpret LMID as 'provide only the libraries for this |
6657 | namespace' but GDB is currently only providing lmid, start, and | |
6658 | prev, or nothing. */ | |
6659 | if (lmid != 0) | |
6660 | warning ("ignoring lmid=0x%s without start", paddress (lmid)); | |
6661 | ||
8d56636a MM |
6662 | CORE_ADDR r_debug = priv->r_debug; |
6663 | if (r_debug == 0) | |
6664 | r_debug = priv->r_debug = get_r_debug (pid, is_elf64); | |
b1fbec62 GB |
6665 | |
6666 | /* We failed to find DT_DEBUG. Such situation will not change | |
6667 | for this inferior - do not retry it. Report it to GDB as | |
6668 | E01, see for the reasons at the GDB solib-svr4.c side. */ | |
8d56636a | 6669 | if (r_debug == (CORE_ADDR) -1) |
b1fbec62 GB |
6670 | return -1; |
6671 | ||
ad10f44e MM |
6672 | /* Terminate the header if we end up with an empty list. */ |
6673 | if (r_debug == 0) | |
6674 | document += ">"; | |
6675 | ||
8d56636a | 6676 | while (r_debug != 0) |
2268b414 | 6677 | { |
8d56636a MM |
6678 | int r_version = 0; |
6679 | if (linux_read_memory (r_debug + lmo->r_version_offset, | |
b1fbec62 | 6680 | (unsigned char *) &r_version, |
8d56636a MM |
6681 | sizeof (r_version)) != 0) |
6682 | { | |
6683 | warning ("unable to read r_version from 0x%s", | |
6684 | paddress (r_debug + lmo->r_version_offset)); | |
6685 | break; | |
6686 | } | |
6687 | ||
6688 | if (r_version < 1) | |
b1fbec62 GB |
6689 | { |
6690 | warning ("unexpected r_debug version %d", r_version); | |
8d56636a | 6691 | break; |
b1fbec62 | 6692 | } |
8d56636a MM |
6693 | |
6694 | if (read_one_ptr (r_debug + lmo->r_map_offset, &lm_addr, | |
6695 | ptr_size) != 0) | |
b1fbec62 | 6696 | { |
8d56636a MM |
6697 | warning ("unable to read r_map from 0x%s", |
6698 | paddress (r_debug + lmo->r_map_offset)); | |
6699 | break; | |
b1fbec62 | 6700 | } |
2268b414 | 6701 | |
ad10f44e MM |
6702 | /* We read the entire namespace. */ |
6703 | lm_prev = 0; | |
6704 | ||
6705 | /* The first entry corresponds to the main executable unless the | |
6706 | dynamic loader was loaded late by a static executable. But | |
6707 | in such case the main executable does not have PT_DYNAMIC | |
6708 | present and we would not have gotten here. */ | |
6709 | if (r_debug == priv->r_debug) | |
6710 | { | |
6711 | if (lm_addr != 0) | |
6712 | string_appendf (document, " main-lm=\"0x%s\">", | |
6713 | paddress (lm_addr)); | |
6714 | else | |
6715 | document += ">"; | |
6716 | ||
6717 | lm_prev = lm_addr; | |
6718 | if (read_one_ptr (lm_addr + lmo->l_next_offset, | |
6719 | &lm_addr, ptr_size) != 0) | |
6720 | { | |
6721 | warning ("unable to read l_next from 0x%s", | |
6722 | paddress (lm_addr + lmo->l_next_offset)); | |
6723 | break; | |
6724 | } | |
6725 | } | |
6726 | ||
2733d9d5 | 6727 | read_link_map (document, r_debug, lm_addr, lm_prev, ptr_size, lmo); |
b1fbec62 | 6728 | |
8d56636a MM |
6729 | if (r_version < 2) |
6730 | break; | |
b1fbec62 | 6731 | |
8d56636a MM |
6732 | if (read_one_ptr (r_debug + lmo->r_next_offset, &r_debug, |
6733 | ptr_size) != 0) | |
2268b414 | 6734 | { |
8d56636a MM |
6735 | warning ("unable to read r_next from 0x%s", |
6736 | paddress (r_debug + lmo->r_next_offset)); | |
6737 | break; | |
d878444c | 6738 | } |
0afae3cf | 6739 | } |
2268b414 JK |
6740 | } |
6741 | ||
ad10f44e | 6742 | document += "</library-list-svr4>"; |
b1fbec62 | 6743 | |
f6e8a41e | 6744 | int document_len = document.length (); |
2268b414 JK |
6745 | if (offset < document_len) |
6746 | document_len -= offset; | |
6747 | else | |
6748 | document_len = 0; | |
6749 | if (len > document_len) | |
6750 | len = document_len; | |
6751 | ||
f6e8a41e | 6752 | memcpy (readbuf, document.data () + offset, len); |
2268b414 JK |
6753 | |
6754 | return len; | |
6755 | } | |
6756 | ||
9accd112 MM |
6757 | #ifdef HAVE_LINUX_BTRACE |
6758 | ||
8263b346 TBA |
6759 | bool |
6760 | linux_process_target::supports_btrace () | |
6761 | { | |
6762 | return true; | |
6763 | } | |
6764 | ||
79597bdd | 6765 | btrace_target_info * |
696c0d5e | 6766 | linux_process_target::enable_btrace (thread_info *tp, |
79597bdd TBA |
6767 | const btrace_config *conf) |
6768 | { | |
696c0d5e | 6769 | return linux_enable_btrace (tp->id, conf); |
79597bdd TBA |
6770 | } |
6771 | ||
969c39fb | 6772 | /* See to_disable_btrace target method. */ |
9accd112 | 6773 | |
79597bdd TBA |
6774 | int |
6775 | linux_process_target::disable_btrace (btrace_target_info *tinfo) | |
969c39fb MM |
6776 | { |
6777 | enum btrace_error err; | |
6778 | ||
6779 | err = linux_disable_btrace (tinfo); | |
6780 | return (err == BTRACE_ERR_NONE ? 0 : -1); | |
6781 | } | |
6782 | ||
bc504a31 | 6783 | /* Encode an Intel Processor Trace configuration. */ |
b20a6524 MM |
6784 | |
6785 | static void | |
873a185b | 6786 | linux_low_encode_pt_config (std::string *buffer, |
b20a6524 MM |
6787 | const struct btrace_data_pt_config *config) |
6788 | { | |
873a185b | 6789 | *buffer += "<pt-config>\n"; |
b20a6524 MM |
6790 | |
6791 | switch (config->cpu.vendor) | |
6792 | { | |
6793 | case CV_INTEL: | |
873a185b TT |
6794 | string_xml_appendf (*buffer, "<cpu vendor=\"GenuineIntel\" family=\"%u\" " |
6795 | "model=\"%u\" stepping=\"%u\"/>\n", | |
6796 | config->cpu.family, config->cpu.model, | |
6797 | config->cpu.stepping); | |
b20a6524 MM |
6798 | break; |
6799 | ||
6800 | default: | |
6801 | break; | |
6802 | } | |
6803 | ||
873a185b | 6804 | *buffer += "</pt-config>\n"; |
b20a6524 MM |
6805 | } |
6806 | ||
6807 | /* Encode a raw buffer. */ | |
6808 | ||
6809 | static void | |
873a185b | 6810 | linux_low_encode_raw (std::string *buffer, const gdb_byte *data, |
b20a6524 MM |
6811 | unsigned int size) |
6812 | { | |
6813 | if (size == 0) | |
6814 | return; | |
6815 | ||
268a13a5 | 6816 | /* We use hex encoding - see gdbsupport/rsp-low.h. */ |
873a185b | 6817 | *buffer += "<raw>\n"; |
b20a6524 MM |
6818 | |
6819 | while (size-- > 0) | |
6820 | { | |
6821 | char elem[2]; | |
6822 | ||
6823 | elem[0] = tohex ((*data >> 4) & 0xf); | |
6824 | elem[1] = tohex (*data++ & 0xf); | |
6825 | ||
8b2d5ef8 | 6826 | buffer->append (elem, 2); |
b20a6524 MM |
6827 | } |
6828 | ||
873a185b | 6829 | *buffer += "</raw>\n"; |
b20a6524 MM |
6830 | } |
6831 | ||
969c39fb MM |
6832 | /* See to_read_btrace target method. */ |
6833 | ||
79597bdd TBA |
6834 | int |
6835 | linux_process_target::read_btrace (btrace_target_info *tinfo, | |
873a185b | 6836 | std::string *buffer, |
79597bdd | 6837 | enum btrace_read_type type) |
9accd112 | 6838 | { |
734b0e4b | 6839 | struct btrace_data btrace; |
969c39fb | 6840 | enum btrace_error err; |
9accd112 | 6841 | |
969c39fb MM |
6842 | err = linux_read_btrace (&btrace, tinfo, type); |
6843 | if (err != BTRACE_ERR_NONE) | |
6844 | { | |
6845 | if (err == BTRACE_ERR_OVERFLOW) | |
873a185b | 6846 | *buffer += "E.Overflow."; |
969c39fb | 6847 | else |
873a185b | 6848 | *buffer += "E.Generic Error."; |
969c39fb | 6849 | |
8dcc53b3 | 6850 | return -1; |
969c39fb | 6851 | } |
9accd112 | 6852 | |
734b0e4b MM |
6853 | switch (btrace.format) |
6854 | { | |
6855 | case BTRACE_FORMAT_NONE: | |
873a185b | 6856 | *buffer += "E.No Trace."; |
8dcc53b3 | 6857 | return -1; |
734b0e4b MM |
6858 | |
6859 | case BTRACE_FORMAT_BTS: | |
873a185b TT |
6860 | *buffer += "<!DOCTYPE btrace SYSTEM \"btrace.dtd\">\n"; |
6861 | *buffer += "<btrace version=\"1.0\">\n"; | |
9accd112 | 6862 | |
46f29a9a | 6863 | for (const btrace_block &block : *btrace.variant.bts.blocks) |
873a185b TT |
6864 | string_xml_appendf (*buffer, "<block begin=\"0x%s\" end=\"0x%s\"/>\n", |
6865 | paddress (block.begin), paddress (block.end)); | |
9accd112 | 6866 | |
873a185b | 6867 | *buffer += "</btrace>\n"; |
734b0e4b MM |
6868 | break; |
6869 | ||
b20a6524 | 6870 | case BTRACE_FORMAT_PT: |
873a185b TT |
6871 | *buffer += "<!DOCTYPE btrace SYSTEM \"btrace.dtd\">\n"; |
6872 | *buffer += "<btrace version=\"1.0\">\n"; | |
6873 | *buffer += "<pt>\n"; | |
b20a6524 MM |
6874 | |
6875 | linux_low_encode_pt_config (buffer, &btrace.variant.pt.config); | |
9accd112 | 6876 | |
b20a6524 MM |
6877 | linux_low_encode_raw (buffer, btrace.variant.pt.data, |
6878 | btrace.variant.pt.size); | |
6879 | ||
873a185b TT |
6880 | *buffer += "</pt>\n"; |
6881 | *buffer += "</btrace>\n"; | |
b20a6524 MM |
6882 | break; |
6883 | ||
6884 | default: | |
873a185b | 6885 | *buffer += "E.Unsupported Trace Format."; |
8dcc53b3 | 6886 | return -1; |
734b0e4b | 6887 | } |
969c39fb MM |
6888 | |
6889 | return 0; | |
9accd112 | 6890 | } |
f4abbc16 MM |
6891 | |
6892 | /* See to_btrace_conf target method. */ | |
6893 | ||
79597bdd TBA |
6894 | int |
6895 | linux_process_target::read_btrace_conf (const btrace_target_info *tinfo, | |
873a185b | 6896 | std::string *buffer) |
f4abbc16 MM |
6897 | { |
6898 | const struct btrace_config *conf; | |
6899 | ||
873a185b TT |
6900 | *buffer += "<!DOCTYPE btrace-conf SYSTEM \"btrace-conf.dtd\">\n"; |
6901 | *buffer += "<btrace-conf version=\"1.0\">\n"; | |
f4abbc16 MM |
6902 | |
6903 | conf = linux_btrace_conf (tinfo); | |
6904 | if (conf != NULL) | |
6905 | { | |
6906 | switch (conf->format) | |
6907 | { | |
6908 | case BTRACE_FORMAT_NONE: | |
6909 | break; | |
6910 | ||
6911 | case BTRACE_FORMAT_BTS: | |
873a185b TT |
6912 | string_xml_appendf (*buffer, "<bts"); |
6913 | string_xml_appendf (*buffer, " size=\"0x%x\"", conf->bts.size); | |
6914 | string_xml_appendf (*buffer, " />\n"); | |
f4abbc16 | 6915 | break; |
b20a6524 MM |
6916 | |
6917 | case BTRACE_FORMAT_PT: | |
873a185b TT |
6918 | string_xml_appendf (*buffer, "<pt"); |
6919 | string_xml_appendf (*buffer, " size=\"0x%x\"", conf->pt.size); | |
6920 | string_xml_appendf (*buffer, "/>\n"); | |
b20a6524 | 6921 | break; |
f4abbc16 MM |
6922 | } |
6923 | } | |
6924 | ||
873a185b | 6925 | *buffer += "</btrace-conf>\n"; |
f4abbc16 MM |
6926 | return 0; |
6927 | } | |
9accd112 MM |
6928 | #endif /* HAVE_LINUX_BTRACE */ |
6929 | ||
7b669087 GB |
6930 | /* See nat/linux-nat.h. */ |
6931 | ||
6932 | ptid_t | |
6933 | current_lwp_ptid (void) | |
6934 | { | |
6935 | return ptid_of (current_thread); | |
6936 | } | |
6937 | ||
7f63b89b TBA |
6938 | const char * |
6939 | linux_process_target::thread_name (ptid_t thread) | |
6940 | { | |
6941 | return linux_proc_tid_get_name (thread); | |
6942 | } | |
6943 | ||
6944 | #if USE_THREAD_DB | |
6945 | bool | |
6946 | linux_process_target::thread_handle (ptid_t ptid, gdb_byte **handle, | |
6947 | int *handle_len) | |
6948 | { | |
6949 | return thread_db_thread_handle (ptid, handle, handle_len); | |
6950 | } | |
6951 | #endif | |
6952 | ||
7b961964 SM |
6953 | thread_info * |
6954 | linux_process_target::thread_pending_parent (thread_info *thread) | |
6955 | { | |
6956 | lwp_info *parent = get_thread_lwp (thread)->pending_parent (); | |
6957 | ||
6958 | if (parent == nullptr) | |
6959 | return nullptr; | |
6960 | ||
6961 | return get_lwp_thread (parent); | |
6962 | } | |
6963 | ||
df5ad102 | 6964 | thread_info * |
faf44a31 PA |
6965 | linux_process_target::thread_pending_child (thread_info *thread, |
6966 | target_waitkind *kind) | |
df5ad102 | 6967 | { |
faf44a31 | 6968 | lwp_info *child = get_thread_lwp (thread)->pending_child (kind); |
df5ad102 SM |
6969 | |
6970 | if (child == nullptr) | |
6971 | return nullptr; | |
6972 | ||
6973 | return get_lwp_thread (child); | |
6974 | } | |
6975 | ||
276d4552 YQ |
6976 | /* Default implementation of linux_target_ops method "set_pc" for |
6977 | 32-bit pc register which is literally named "pc". */ | |
6978 | ||
6979 | void | |
6980 | linux_set_pc_32bit (struct regcache *regcache, CORE_ADDR pc) | |
6981 | { | |
6982 | uint32_t newpc = pc; | |
6983 | ||
6984 | supply_register_by_name (regcache, "pc", &newpc); | |
6985 | } | |
6986 | ||
6987 | /* Default implementation of linux_target_ops method "get_pc" for | |
6988 | 32-bit pc register which is literally named "pc". */ | |
6989 | ||
6990 | CORE_ADDR | |
6991 | linux_get_pc_32bit (struct regcache *regcache) | |
6992 | { | |
6993 | uint32_t pc; | |
6994 | ||
6995 | collect_register_by_name (regcache, "pc", &pc); | |
c058728c | 6996 | threads_debug_printf ("stop pc is 0x%" PRIx32, pc); |
276d4552 YQ |
6997 | return pc; |
6998 | } | |
6999 | ||
6f69e520 YQ |
7000 | /* Default implementation of linux_target_ops method "set_pc" for |
7001 | 64-bit pc register which is literally named "pc". */ | |
7002 | ||
7003 | void | |
7004 | linux_set_pc_64bit (struct regcache *regcache, CORE_ADDR pc) | |
7005 | { | |
7006 | uint64_t newpc = pc; | |
7007 | ||
7008 | supply_register_by_name (regcache, "pc", &newpc); | |
7009 | } | |
7010 | ||
7011 | /* Default implementation of linux_target_ops method "get_pc" for | |
7012 | 64-bit pc register which is literally named "pc". */ | |
7013 | ||
7014 | CORE_ADDR | |
7015 | linux_get_pc_64bit (struct regcache *regcache) | |
7016 | { | |
7017 | uint64_t pc; | |
7018 | ||
7019 | collect_register_by_name (regcache, "pc", &pc); | |
c058728c | 7020 | threads_debug_printf ("stop pc is 0x%" PRIx64, pc); |
6f69e520 YQ |
7021 | return pc; |
7022 | } | |
7023 | ||
0570503d | 7024 | /* See linux-low.h. */ |
974c89e0 | 7025 | |
0570503d | 7026 | int |
43e5fbd8 | 7027 | linux_get_auxv (int pid, int wordsize, CORE_ADDR match, CORE_ADDR *valp) |
974c89e0 AH |
7028 | { |
7029 | gdb_byte *data = (gdb_byte *) alloca (2 * wordsize); | |
7030 | int offset = 0; | |
7031 | ||
7032 | gdb_assert (wordsize == 4 || wordsize == 8); | |
7033 | ||
43e5fbd8 TJB |
7034 | while (the_target->read_auxv (pid, offset, data, 2 * wordsize) |
7035 | == 2 * wordsize) | |
974c89e0 AH |
7036 | { |
7037 | if (wordsize == 4) | |
7038 | { | |
0570503d | 7039 | uint32_t *data_p = (uint32_t *) data; |
974c89e0 | 7040 | if (data_p[0] == match) |
0570503d PFC |
7041 | { |
7042 | *valp = data_p[1]; | |
7043 | return 1; | |
7044 | } | |
974c89e0 AH |
7045 | } |
7046 | else | |
7047 | { | |
0570503d | 7048 | uint64_t *data_p = (uint64_t *) data; |
974c89e0 | 7049 | if (data_p[0] == match) |
0570503d PFC |
7050 | { |
7051 | *valp = data_p[1]; | |
7052 | return 1; | |
7053 | } | |
974c89e0 AH |
7054 | } |
7055 | ||
7056 | offset += 2 * wordsize; | |
7057 | } | |
7058 | ||
7059 | return 0; | |
7060 | } | |
7061 | ||
7062 | /* See linux-low.h. */ | |
7063 | ||
7064 | CORE_ADDR | |
43e5fbd8 | 7065 | linux_get_hwcap (int pid, int wordsize) |
974c89e0 | 7066 | { |
0570503d | 7067 | CORE_ADDR hwcap = 0; |
43e5fbd8 | 7068 | linux_get_auxv (pid, wordsize, AT_HWCAP, &hwcap); |
0570503d | 7069 | return hwcap; |
974c89e0 AH |
7070 | } |
7071 | ||
7072 | /* See linux-low.h. */ | |
7073 | ||
7074 | CORE_ADDR | |
43e5fbd8 | 7075 | linux_get_hwcap2 (int pid, int wordsize) |
974c89e0 | 7076 | { |
0570503d | 7077 | CORE_ADDR hwcap2 = 0; |
43e5fbd8 | 7078 | linux_get_auxv (pid, wordsize, AT_HWCAP2, &hwcap2); |
0570503d | 7079 | return hwcap2; |
974c89e0 | 7080 | } |
6f69e520 | 7081 | |
3aee8918 PA |
7082 | #ifdef HAVE_LINUX_REGSETS |
7083 | void | |
7084 | initialize_regsets_info (struct regsets_info *info) | |
7085 | { | |
7086 | for (info->num_regsets = 0; | |
7087 | info->regsets[info->num_regsets].size >= 0; | |
7088 | info->num_regsets++) | |
7089 | ; | |
3aee8918 PA |
7090 | } |
7091 | #endif | |
7092 | ||
da6d8c04 DJ |
7093 | void |
7094 | initialize_low (void) | |
7095 | { | |
bd99dc85 | 7096 | struct sigaction sigchld_action; |
dd373349 | 7097 | |
bd99dc85 | 7098 | memset (&sigchld_action, 0, sizeof (sigchld_action)); |
ef0478f6 | 7099 | set_target_ops (the_linux_target); |
dd373349 | 7100 | |
aa7c7447 | 7101 | linux_ptrace_init_warnings (); |
1b919490 | 7102 | linux_proc_init_warnings (); |
bd99dc85 PA |
7103 | |
7104 | sigchld_action.sa_handler = sigchld_handler; | |
7105 | sigemptyset (&sigchld_action.sa_mask); | |
7106 | sigchld_action.sa_flags = SA_RESTART; | |
7107 | sigaction (SIGCHLD, &sigchld_action, NULL); | |
3aee8918 PA |
7108 | |
7109 | initialize_low_arch (); | |
89245bc0 DB |
7110 | |
7111 | linux_check_ptrace_features (); | |
da6d8c04 | 7112 | } |