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