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da6d8c04 | 1 | /* Low level interface to ptrace, for the remote server for GDB. |
b811d2c2 | 2 | Copyright (C) 1995-2020 Free Software Foundation, Inc. |
da6d8c04 DJ |
3 | |
4 | This file is part of GDB. | |
5 | ||
6 | This program is free software; you can redistribute it and/or modify | |
7 | it under the terms of the GNU General Public License as published by | |
a9762ec7 | 8 | the Free Software Foundation; either version 3 of the License, or |
da6d8c04 DJ |
9 | (at your option) any later version. |
10 | ||
11 | This program is distributed in the hope that it will be useful, | |
12 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
13 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
14 | GNU General Public License for more details. | |
15 | ||
16 | You should have received a copy of the GNU General Public License | |
a9762ec7 | 17 | along with this program. If not, see <http://www.gnu.org/licenses/>. */ |
da6d8c04 DJ |
18 | |
19 | #include "server.h" | |
58caa3dc | 20 | #include "linux-low.h" |
125f8a3d | 21 | #include "nat/linux-osdata.h" |
268a13a5 | 22 | #include "gdbsupport/agent.h" |
de0d863e | 23 | #include "tdesc.h" |
268a13a5 TT |
24 | #include "gdbsupport/rsp-low.h" |
25 | #include "gdbsupport/signals-state-save-restore.h" | |
96d7229d LM |
26 | #include "nat/linux-nat.h" |
27 | #include "nat/linux-waitpid.h" | |
268a13a5 | 28 | #include "gdbsupport/gdb_wait.h" |
5826e159 | 29 | #include "nat/gdb_ptrace.h" |
125f8a3d GB |
30 | #include "nat/linux-ptrace.h" |
31 | #include "nat/linux-procfs.h" | |
8cc73a39 | 32 | #include "nat/linux-personality.h" |
da6d8c04 DJ |
33 | #include <signal.h> |
34 | #include <sys/ioctl.h> | |
35 | #include <fcntl.h> | |
0a30fbc4 | 36 | #include <unistd.h> |
fd500816 | 37 | #include <sys/syscall.h> |
f9387fc3 | 38 | #include <sched.h> |
07e059b5 VP |
39 | #include <ctype.h> |
40 | #include <pwd.h> | |
41 | #include <sys/types.h> | |
42 | #include <dirent.h> | |
53ce3c39 | 43 | #include <sys/stat.h> |
efcbbd14 | 44 | #include <sys/vfs.h> |
1570b33e | 45 | #include <sys/uio.h> |
268a13a5 | 46 | #include "gdbsupport/filestuff.h" |
c144c7a0 | 47 | #include "tracepoint.h" |
276d4552 | 48 | #include <inttypes.h> |
268a13a5 | 49 | #include "gdbsupport/common-inferior.h" |
2090129c | 50 | #include "nat/fork-inferior.h" |
268a13a5 | 51 | #include "gdbsupport/environ.h" |
21987b9c | 52 | #include "gdbsupport/gdb-sigmask.h" |
268a13a5 | 53 | #include "gdbsupport/scoped_restore.h" |
957f3f49 DE |
54 | #ifndef ELFMAG0 |
55 | /* Don't include <linux/elf.h> here. If it got included by gdb_proc_service.h | |
56 | then ELFMAG0 will have been defined. If it didn't get included by | |
57 | gdb_proc_service.h then including it will likely introduce a duplicate | |
58 | definition of elf_fpregset_t. */ | |
59 | #include <elf.h> | |
60 | #endif | |
14d2069a | 61 | #include "nat/linux-namespaces.h" |
efcbbd14 | 62 | |
03583c20 UW |
63 | #ifdef HAVE_PERSONALITY |
64 | # include <sys/personality.h> | |
65 | # if !HAVE_DECL_ADDR_NO_RANDOMIZE | |
66 | # define ADDR_NO_RANDOMIZE 0x0040000 | |
67 | # endif | |
68 | #endif | |
69 | ||
fd462a61 DJ |
70 | #ifndef O_LARGEFILE |
71 | #define O_LARGEFILE 0 | |
72 | #endif | |
1a981360 | 73 | |
69f4c9cc AH |
74 | #ifndef AT_HWCAP2 |
75 | #define AT_HWCAP2 26 | |
76 | #endif | |
77 | ||
db0dfaa0 LM |
78 | /* Some targets did not define these ptrace constants from the start, |
79 | so gdbserver defines them locally here. In the future, these may | |
80 | be removed after they are added to asm/ptrace.h. */ | |
81 | #if !(defined(PT_TEXT_ADDR) \ | |
82 | || defined(PT_DATA_ADDR) \ | |
83 | || defined(PT_TEXT_END_ADDR)) | |
84 | #if defined(__mcoldfire__) | |
85 | /* These are still undefined in 3.10 kernels. */ | |
86 | #define PT_TEXT_ADDR 49*4 | |
87 | #define PT_DATA_ADDR 50*4 | |
88 | #define PT_TEXT_END_ADDR 51*4 | |
89 | /* BFIN already defines these since at least 2.6.32 kernels. */ | |
90 | #elif defined(BFIN) | |
91 | #define PT_TEXT_ADDR 220 | |
92 | #define PT_TEXT_END_ADDR 224 | |
93 | #define PT_DATA_ADDR 228 | |
94 | /* These are still undefined in 3.10 kernels. */ | |
95 | #elif defined(__TMS320C6X__) | |
96 | #define PT_TEXT_ADDR (0x10000*4) | |
97 | #define PT_DATA_ADDR (0x10004*4) | |
98 | #define PT_TEXT_END_ADDR (0x10008*4) | |
99 | #endif | |
100 | #endif | |
101 | ||
5203ae1e TBA |
102 | #if (defined(__UCLIBC__) \ |
103 | && defined(HAS_NOMMU) \ | |
104 | && defined(PT_TEXT_ADDR) \ | |
105 | && defined(PT_DATA_ADDR) \ | |
106 | && defined(PT_TEXT_END_ADDR)) | |
107 | #define SUPPORTS_READ_OFFSETS | |
108 | #endif | |
109 | ||
9accd112 | 110 | #ifdef HAVE_LINUX_BTRACE |
125f8a3d | 111 | # include "nat/linux-btrace.h" |
268a13a5 | 112 | # include "gdbsupport/btrace-common.h" |
9accd112 MM |
113 | #endif |
114 | ||
8365dcf5 TJB |
115 | #ifndef HAVE_ELF32_AUXV_T |
116 | /* Copied from glibc's elf.h. */ | |
117 | typedef struct | |
118 | { | |
119 | uint32_t a_type; /* Entry type */ | |
120 | union | |
121 | { | |
122 | uint32_t a_val; /* Integer value */ | |
123 | /* We use to have pointer elements added here. We cannot do that, | |
124 | though, since it does not work when using 32-bit definitions | |
125 | on 64-bit platforms and vice versa. */ | |
126 | } a_un; | |
127 | } Elf32_auxv_t; | |
128 | #endif | |
129 | ||
130 | #ifndef HAVE_ELF64_AUXV_T | |
131 | /* Copied from glibc's elf.h. */ | |
132 | typedef struct | |
133 | { | |
134 | uint64_t a_type; /* Entry type */ | |
135 | union | |
136 | { | |
137 | uint64_t a_val; /* Integer value */ | |
138 | /* We use to have pointer elements added here. We cannot do that, | |
139 | though, since it does not work when using 32-bit definitions | |
140 | on 64-bit platforms and vice versa. */ | |
141 | } a_un; | |
142 | } Elf64_auxv_t; | |
143 | #endif | |
144 | ||
ded48a5e YQ |
145 | /* Does the current host support PTRACE_GETREGSET? */ |
146 | int have_ptrace_getregset = -1; | |
147 | ||
cff068da GB |
148 | /* LWP accessors. */ |
149 | ||
150 | /* See nat/linux-nat.h. */ | |
151 | ||
152 | ptid_t | |
153 | ptid_of_lwp (struct lwp_info *lwp) | |
154 | { | |
155 | return ptid_of (get_lwp_thread (lwp)); | |
156 | } | |
157 | ||
158 | /* See nat/linux-nat.h. */ | |
159 | ||
4b134ca1 GB |
160 | void |
161 | lwp_set_arch_private_info (struct lwp_info *lwp, | |
162 | struct arch_lwp_info *info) | |
163 | { | |
164 | lwp->arch_private = info; | |
165 | } | |
166 | ||
167 | /* See nat/linux-nat.h. */ | |
168 | ||
169 | struct arch_lwp_info * | |
170 | lwp_arch_private_info (struct lwp_info *lwp) | |
171 | { | |
172 | return lwp->arch_private; | |
173 | } | |
174 | ||
175 | /* See nat/linux-nat.h. */ | |
176 | ||
cff068da GB |
177 | int |
178 | lwp_is_stopped (struct lwp_info *lwp) | |
179 | { | |
180 | return lwp->stopped; | |
181 | } | |
182 | ||
183 | /* See nat/linux-nat.h. */ | |
184 | ||
185 | enum target_stop_reason | |
186 | lwp_stop_reason (struct lwp_info *lwp) | |
187 | { | |
188 | return lwp->stop_reason; | |
189 | } | |
190 | ||
0e00e962 AA |
191 | /* See nat/linux-nat.h. */ |
192 | ||
193 | int | |
194 | lwp_is_stepping (struct lwp_info *lwp) | |
195 | { | |
196 | return lwp->stepping; | |
197 | } | |
198 | ||
05044653 PA |
199 | /* A list of all unknown processes which receive stop signals. Some |
200 | other process will presumably claim each of these as forked | |
201 | children momentarily. */ | |
24a09b5f | 202 | |
05044653 PA |
203 | struct simple_pid_list |
204 | { | |
205 | /* The process ID. */ | |
206 | int pid; | |
207 | ||
208 | /* The status as reported by waitpid. */ | |
209 | int status; | |
210 | ||
211 | /* Next in chain. */ | |
212 | struct simple_pid_list *next; | |
213 | }; | |
214 | struct simple_pid_list *stopped_pids; | |
215 | ||
216 | /* Trivial list manipulation functions to keep track of a list of new | |
217 | stopped processes. */ | |
218 | ||
219 | static void | |
220 | add_to_pid_list (struct simple_pid_list **listp, int pid, int status) | |
221 | { | |
8d749320 | 222 | struct simple_pid_list *new_pid = XNEW (struct simple_pid_list); |
05044653 PA |
223 | |
224 | new_pid->pid = pid; | |
225 | new_pid->status = status; | |
226 | new_pid->next = *listp; | |
227 | *listp = new_pid; | |
228 | } | |
229 | ||
230 | static int | |
231 | pull_pid_from_list (struct simple_pid_list **listp, int pid, int *statusp) | |
232 | { | |
233 | struct simple_pid_list **p; | |
234 | ||
235 | for (p = listp; *p != NULL; p = &(*p)->next) | |
236 | if ((*p)->pid == pid) | |
237 | { | |
238 | struct simple_pid_list *next = (*p)->next; | |
239 | ||
240 | *statusp = (*p)->status; | |
241 | xfree (*p); | |
242 | *p = next; | |
243 | return 1; | |
244 | } | |
245 | return 0; | |
246 | } | |
24a09b5f | 247 | |
bde24c0a PA |
248 | enum stopping_threads_kind |
249 | { | |
250 | /* Not stopping threads presently. */ | |
251 | NOT_STOPPING_THREADS, | |
252 | ||
253 | /* Stopping threads. */ | |
254 | STOPPING_THREADS, | |
255 | ||
256 | /* Stopping and suspending threads. */ | |
257 | STOPPING_AND_SUSPENDING_THREADS | |
258 | }; | |
259 | ||
260 | /* This is set while stop_all_lwps is in effect. */ | |
261 | enum stopping_threads_kind stopping_threads = NOT_STOPPING_THREADS; | |
0d62e5e8 DJ |
262 | |
263 | /* FIXME make into a target method? */ | |
24a09b5f | 264 | int using_threads = 1; |
24a09b5f | 265 | |
fa593d66 PA |
266 | /* True if we're presently stabilizing threads (moving them out of |
267 | jump pads). */ | |
268 | static int stabilizing_threads; | |
269 | ||
f50bf8e5 | 270 | static void unsuspend_all_lwps (struct lwp_info *except); |
b3312d80 | 271 | static struct lwp_info *add_lwp (ptid_t ptid); |
95954743 | 272 | static void mark_lwp_dead (struct lwp_info *lwp, int wstat); |
00db26fa | 273 | static int lwp_is_marked_dead (struct lwp_info *lwp); |
d50171e4 | 274 | static int finish_step_over (struct lwp_info *lwp); |
d50171e4 | 275 | static int kill_lwp (unsigned long lwpid, int signo); |
863d01bd | 276 | static void enqueue_pending_signal (struct lwp_info *lwp, int signal, siginfo_t *info); |
ece66d65 | 277 | static int linux_low_ptrace_options (int attached); |
ced2dffb | 278 | static int check_ptrace_stopped_lwp_gone (struct lwp_info *lp); |
d50171e4 | 279 | |
582511be PA |
280 | /* When the event-loop is doing a step-over, this points at the thread |
281 | being stepped. */ | |
282 | ptid_t step_over_bkpt; | |
283 | ||
7d00775e | 284 | /* True if the low target can hardware single-step. */ |
d50171e4 PA |
285 | |
286 | static int | |
287 | can_hardware_single_step (void) | |
288 | { | |
7d00775e AT |
289 | if (the_low_target.supports_hardware_single_step != NULL) |
290 | return the_low_target.supports_hardware_single_step (); | |
291 | else | |
292 | return 0; | |
293 | } | |
294 | ||
295 | /* True if the low target can software single-step. Such targets | |
fa5308bd | 296 | implement the GET_NEXT_PCS callback. */ |
7d00775e AT |
297 | |
298 | static int | |
299 | can_software_single_step (void) | |
300 | { | |
fa5308bd | 301 | return (the_low_target.get_next_pcs != NULL); |
d50171e4 PA |
302 | } |
303 | ||
304 | /* True if the low target supports memory breakpoints. If so, we'll | |
305 | have a GET_PC implementation. */ | |
306 | ||
307 | static int | |
308 | supports_breakpoints (void) | |
309 | { | |
310 | return (the_low_target.get_pc != NULL); | |
311 | } | |
0d62e5e8 | 312 | |
fa593d66 PA |
313 | /* Returns true if this target can support fast tracepoints. This |
314 | does not mean that the in-process agent has been loaded in the | |
315 | inferior. */ | |
316 | ||
317 | static int | |
318 | supports_fast_tracepoints (void) | |
319 | { | |
320 | return the_low_target.install_fast_tracepoint_jump_pad != NULL; | |
321 | } | |
322 | ||
c2d6af84 PA |
323 | /* True if LWP is stopped in its stepping range. */ |
324 | ||
325 | static int | |
326 | lwp_in_step_range (struct lwp_info *lwp) | |
327 | { | |
328 | CORE_ADDR pc = lwp->stop_pc; | |
329 | ||
330 | return (pc >= lwp->step_range_start && pc < lwp->step_range_end); | |
331 | } | |
332 | ||
0d62e5e8 DJ |
333 | struct pending_signals |
334 | { | |
335 | int signal; | |
32ca6d61 | 336 | siginfo_t info; |
0d62e5e8 DJ |
337 | struct pending_signals *prev; |
338 | }; | |
611cb4a5 | 339 | |
bd99dc85 PA |
340 | /* The read/write ends of the pipe registered as waitable file in the |
341 | event loop. */ | |
342 | static int linux_event_pipe[2] = { -1, -1 }; | |
343 | ||
344 | /* True if we're currently in async mode. */ | |
345 | #define target_is_async_p() (linux_event_pipe[0] != -1) | |
346 | ||
02fc4de7 | 347 | static void send_sigstop (struct lwp_info *lwp); |
bd99dc85 | 348 | |
d0722149 DE |
349 | /* Return non-zero if HEADER is a 64-bit ELF file. */ |
350 | ||
351 | static int | |
214d508e | 352 | elf_64_header_p (const Elf64_Ehdr *header, unsigned int *machine) |
d0722149 | 353 | { |
214d508e L |
354 | if (header->e_ident[EI_MAG0] == ELFMAG0 |
355 | && header->e_ident[EI_MAG1] == ELFMAG1 | |
356 | && header->e_ident[EI_MAG2] == ELFMAG2 | |
357 | && header->e_ident[EI_MAG3] == ELFMAG3) | |
358 | { | |
359 | *machine = header->e_machine; | |
360 | return header->e_ident[EI_CLASS] == ELFCLASS64; | |
361 | ||
362 | } | |
363 | *machine = EM_NONE; | |
364 | return -1; | |
d0722149 DE |
365 | } |
366 | ||
367 | /* Return non-zero if FILE is a 64-bit ELF file, | |
368 | zero if the file is not a 64-bit ELF file, | |
369 | and -1 if the file is not accessible or doesn't exist. */ | |
370 | ||
be07f1a2 | 371 | static int |
214d508e | 372 | elf_64_file_p (const char *file, unsigned int *machine) |
d0722149 | 373 | { |
957f3f49 | 374 | Elf64_Ehdr header; |
d0722149 DE |
375 | int fd; |
376 | ||
377 | fd = open (file, O_RDONLY); | |
378 | if (fd < 0) | |
379 | return -1; | |
380 | ||
381 | if (read (fd, &header, sizeof (header)) != sizeof (header)) | |
382 | { | |
383 | close (fd); | |
384 | return 0; | |
385 | } | |
386 | close (fd); | |
387 | ||
214d508e | 388 | return elf_64_header_p (&header, machine); |
d0722149 DE |
389 | } |
390 | ||
be07f1a2 PA |
391 | /* Accepts an integer PID; Returns true if the executable PID is |
392 | running is a 64-bit ELF file.. */ | |
393 | ||
394 | int | |
214d508e | 395 | linux_pid_exe_is_elf_64_file (int pid, unsigned int *machine) |
be07f1a2 | 396 | { |
d8d2a3ee | 397 | char file[PATH_MAX]; |
be07f1a2 PA |
398 | |
399 | sprintf (file, "/proc/%d/exe", pid); | |
214d508e | 400 | return elf_64_file_p (file, machine); |
be07f1a2 PA |
401 | } |
402 | ||
bd99dc85 PA |
403 | static void |
404 | delete_lwp (struct lwp_info *lwp) | |
405 | { | |
fa96cb38 PA |
406 | struct thread_info *thr = get_lwp_thread (lwp); |
407 | ||
408 | if (debug_threads) | |
409 | debug_printf ("deleting %ld\n", lwpid_of (thr)); | |
410 | ||
411 | remove_thread (thr); | |
466eecee SM |
412 | |
413 | if (the_low_target.delete_thread != NULL) | |
414 | the_low_target.delete_thread (lwp->arch_private); | |
415 | else | |
416 | gdb_assert (lwp->arch_private == NULL); | |
417 | ||
bd99dc85 PA |
418 | free (lwp); |
419 | } | |
420 | ||
95954743 PA |
421 | /* Add a process to the common process list, and set its private |
422 | data. */ | |
423 | ||
424 | static struct process_info * | |
425 | linux_add_process (int pid, int attached) | |
426 | { | |
427 | struct process_info *proc; | |
428 | ||
95954743 | 429 | proc = add_process (pid, attached); |
8d749320 | 430 | proc->priv = XCNEW (struct process_info_private); |
95954743 | 431 | |
aa5ca48f | 432 | if (the_low_target.new_process != NULL) |
fe978cb0 | 433 | proc->priv->arch_private = the_low_target.new_process (); |
aa5ca48f | 434 | |
95954743 PA |
435 | return proc; |
436 | } | |
437 | ||
797bcff5 TBA |
438 | void |
439 | linux_process_target::arch_setup_thread (thread_info *thread) | |
94585166 DB |
440 | { |
441 | struct thread_info *saved_thread; | |
442 | ||
443 | saved_thread = current_thread; | |
444 | current_thread = thread; | |
445 | ||
797bcff5 | 446 | low_arch_setup (); |
94585166 DB |
447 | |
448 | current_thread = saved_thread; | |
449 | } | |
450 | ||
d16f3f6c TBA |
451 | int |
452 | linux_process_target::handle_extended_wait (lwp_info **orig_event_lwp, | |
453 | int wstat) | |
24a09b5f | 454 | { |
c12a5089 | 455 | client_state &cs = get_client_state (); |
94585166 | 456 | struct lwp_info *event_lwp = *orig_event_lwp; |
89a5711c | 457 | int event = linux_ptrace_get_extended_event (wstat); |
de0d863e | 458 | struct thread_info *event_thr = get_lwp_thread (event_lwp); |
54a0b537 | 459 | struct lwp_info *new_lwp; |
24a09b5f | 460 | |
65706a29 PA |
461 | gdb_assert (event_lwp->waitstatus.kind == TARGET_WAITKIND_IGNORE); |
462 | ||
82075af2 JS |
463 | /* All extended events we currently use are mid-syscall. Only |
464 | PTRACE_EVENT_STOP is delivered more like a signal-stop, but | |
465 | you have to be using PTRACE_SEIZE to get that. */ | |
466 | event_lwp->syscall_state = TARGET_WAITKIND_SYSCALL_ENTRY; | |
467 | ||
c269dbdb DB |
468 | if ((event == PTRACE_EVENT_FORK) || (event == PTRACE_EVENT_VFORK) |
469 | || (event == PTRACE_EVENT_CLONE)) | |
24a09b5f | 470 | { |
95954743 | 471 | ptid_t ptid; |
24a09b5f | 472 | unsigned long new_pid; |
05044653 | 473 | int ret, status; |
24a09b5f | 474 | |
de0d863e | 475 | /* Get the pid of the new lwp. */ |
d86d4aaf | 476 | ptrace (PTRACE_GETEVENTMSG, lwpid_of (event_thr), (PTRACE_TYPE_ARG3) 0, |
56f7af9c | 477 | &new_pid); |
24a09b5f DJ |
478 | |
479 | /* If we haven't already seen the new PID stop, wait for it now. */ | |
05044653 | 480 | if (!pull_pid_from_list (&stopped_pids, new_pid, &status)) |
24a09b5f DJ |
481 | { |
482 | /* The new child has a pending SIGSTOP. We can't affect it until it | |
483 | hits the SIGSTOP, but we're already attached. */ | |
484 | ||
97438e3f | 485 | ret = my_waitpid (new_pid, &status, __WALL); |
24a09b5f DJ |
486 | |
487 | if (ret == -1) | |
488 | perror_with_name ("waiting for new child"); | |
489 | else if (ret != new_pid) | |
490 | warning ("wait returned unexpected PID %d", ret); | |
da5898ce | 491 | else if (!WIFSTOPPED (status)) |
24a09b5f DJ |
492 | warning ("wait returned unexpected status 0x%x", status); |
493 | } | |
494 | ||
c269dbdb | 495 | if (event == PTRACE_EVENT_FORK || event == PTRACE_EVENT_VFORK) |
de0d863e DB |
496 | { |
497 | struct process_info *parent_proc; | |
498 | struct process_info *child_proc; | |
499 | struct lwp_info *child_lwp; | |
bfacd19d | 500 | struct thread_info *child_thr; |
de0d863e DB |
501 | struct target_desc *tdesc; |
502 | ||
fd79271b | 503 | ptid = ptid_t (new_pid, new_pid, 0); |
de0d863e DB |
504 | |
505 | if (debug_threads) | |
506 | { | |
507 | debug_printf ("HEW: Got fork event from LWP %ld, " | |
508 | "new child is %d\n", | |
e38504b3 | 509 | ptid_of (event_thr).lwp (), |
e99b03dc | 510 | ptid.pid ()); |
de0d863e DB |
511 | } |
512 | ||
513 | /* Add the new process to the tables and clone the breakpoint | |
514 | lists of the parent. We need to do this even if the new process | |
515 | will be detached, since we will need the process object and the | |
516 | breakpoints to remove any breakpoints from memory when we | |
517 | detach, and the client side will access registers. */ | |
518 | child_proc = linux_add_process (new_pid, 0); | |
519 | gdb_assert (child_proc != NULL); | |
520 | child_lwp = add_lwp (ptid); | |
521 | gdb_assert (child_lwp != NULL); | |
522 | child_lwp->stopped = 1; | |
bfacd19d DB |
523 | child_lwp->must_set_ptrace_flags = 1; |
524 | child_lwp->status_pending_p = 0; | |
525 | child_thr = get_lwp_thread (child_lwp); | |
526 | child_thr->last_resume_kind = resume_stop; | |
998d452a PA |
527 | child_thr->last_status.kind = TARGET_WAITKIND_STOPPED; |
528 | ||
863d01bd | 529 | /* If we're suspending all threads, leave this one suspended |
0f8288ae YQ |
530 | too. If the fork/clone parent is stepping over a breakpoint, |
531 | all other threads have been suspended already. Leave the | |
532 | child suspended too. */ | |
533 | if (stopping_threads == STOPPING_AND_SUSPENDING_THREADS | |
534 | || event_lwp->bp_reinsert != 0) | |
863d01bd PA |
535 | { |
536 | if (debug_threads) | |
537 | debug_printf ("HEW: leaving child suspended\n"); | |
538 | child_lwp->suspended = 1; | |
539 | } | |
540 | ||
de0d863e DB |
541 | parent_proc = get_thread_process (event_thr); |
542 | child_proc->attached = parent_proc->attached; | |
2e7b624b YQ |
543 | |
544 | if (event_lwp->bp_reinsert != 0 | |
545 | && can_software_single_step () | |
546 | && event == PTRACE_EVENT_VFORK) | |
547 | { | |
3b9a79ef YQ |
548 | /* If we leave single-step breakpoints there, child will |
549 | hit it, so uninsert single-step breakpoints from parent | |
2e7b624b YQ |
550 | (and child). Once vfork child is done, reinsert |
551 | them back to parent. */ | |
3b9a79ef | 552 | uninsert_single_step_breakpoints (event_thr); |
2e7b624b YQ |
553 | } |
554 | ||
63c40ec7 | 555 | clone_all_breakpoints (child_thr, event_thr); |
de0d863e | 556 | |
cc397f3a | 557 | tdesc = allocate_target_description (); |
de0d863e DB |
558 | copy_target_description (tdesc, parent_proc->tdesc); |
559 | child_proc->tdesc = tdesc; | |
de0d863e | 560 | |
3a8a0396 DB |
561 | /* Clone arch-specific process data. */ |
562 | if (the_low_target.new_fork != NULL) | |
563 | the_low_target.new_fork (parent_proc, child_proc); | |
564 | ||
de0d863e | 565 | /* Save fork info in the parent thread. */ |
c269dbdb DB |
566 | if (event == PTRACE_EVENT_FORK) |
567 | event_lwp->waitstatus.kind = TARGET_WAITKIND_FORKED; | |
568 | else if (event == PTRACE_EVENT_VFORK) | |
569 | event_lwp->waitstatus.kind = TARGET_WAITKIND_VFORKED; | |
570 | ||
de0d863e | 571 | event_lwp->waitstatus.value.related_pid = ptid; |
c269dbdb | 572 | |
de0d863e DB |
573 | /* The status_pending field contains bits denoting the |
574 | extended event, so when the pending event is handled, | |
575 | the handler will look at lwp->waitstatus. */ | |
576 | event_lwp->status_pending_p = 1; | |
577 | event_lwp->status_pending = wstat; | |
578 | ||
5a04c4cf PA |
579 | /* Link the threads until the parent event is passed on to |
580 | higher layers. */ | |
581 | event_lwp->fork_relative = child_lwp; | |
582 | child_lwp->fork_relative = event_lwp; | |
583 | ||
3b9a79ef YQ |
584 | /* If the parent thread is doing step-over with single-step |
585 | breakpoints, the list of single-step breakpoints are cloned | |
2e7b624b YQ |
586 | from the parent's. Remove them from the child process. |
587 | In case of vfork, we'll reinsert them back once vforked | |
588 | child is done. */ | |
8a81c5d7 | 589 | if (event_lwp->bp_reinsert != 0 |
2e7b624b | 590 | && can_software_single_step ()) |
8a81c5d7 | 591 | { |
8a81c5d7 YQ |
592 | /* The child process is forked and stopped, so it is safe |
593 | to access its memory without stopping all other threads | |
594 | from other processes. */ | |
3b9a79ef | 595 | delete_single_step_breakpoints (child_thr); |
8a81c5d7 | 596 | |
3b9a79ef YQ |
597 | gdb_assert (has_single_step_breakpoints (event_thr)); |
598 | gdb_assert (!has_single_step_breakpoints (child_thr)); | |
8a81c5d7 YQ |
599 | } |
600 | ||
de0d863e DB |
601 | /* Report the event. */ |
602 | return 0; | |
603 | } | |
604 | ||
fa96cb38 PA |
605 | if (debug_threads) |
606 | debug_printf ("HEW: Got clone event " | |
607 | "from LWP %ld, new child is LWP %ld\n", | |
608 | lwpid_of (event_thr), new_pid); | |
609 | ||
fd79271b | 610 | ptid = ptid_t (pid_of (event_thr), new_pid, 0); |
b3312d80 | 611 | new_lwp = add_lwp (ptid); |
24a09b5f | 612 | |
e27d73f6 | 613 | /* Either we're going to immediately resume the new thread |
df95181f | 614 | or leave it stopped. resume_one_lwp is a nop if it |
e27d73f6 | 615 | thinks the thread is currently running, so set this first |
df95181f | 616 | before calling resume_one_lwp. */ |
e27d73f6 DE |
617 | new_lwp->stopped = 1; |
618 | ||
0f8288ae YQ |
619 | /* If we're suspending all threads, leave this one suspended |
620 | too. If the fork/clone parent is stepping over a breakpoint, | |
621 | all other threads have been suspended already. Leave the | |
622 | child suspended too. */ | |
623 | if (stopping_threads == STOPPING_AND_SUSPENDING_THREADS | |
624 | || event_lwp->bp_reinsert != 0) | |
bde24c0a PA |
625 | new_lwp->suspended = 1; |
626 | ||
da5898ce DJ |
627 | /* Normally we will get the pending SIGSTOP. But in some cases |
628 | we might get another signal delivered to the group first. | |
f21cc1a2 | 629 | If we do get another signal, be sure not to lose it. */ |
20ba1ce6 | 630 | if (WSTOPSIG (status) != SIGSTOP) |
da5898ce | 631 | { |
54a0b537 | 632 | new_lwp->stop_expected = 1; |
20ba1ce6 PA |
633 | new_lwp->status_pending_p = 1; |
634 | new_lwp->status_pending = status; | |
da5898ce | 635 | } |
c12a5089 | 636 | else if (cs.report_thread_events) |
65706a29 PA |
637 | { |
638 | new_lwp->waitstatus.kind = TARGET_WAITKIND_THREAD_CREATED; | |
639 | new_lwp->status_pending_p = 1; | |
640 | new_lwp->status_pending = status; | |
641 | } | |
de0d863e | 642 | |
a0aad537 | 643 | #ifdef USE_THREAD_DB |
94c207e0 | 644 | thread_db_notice_clone (event_thr, ptid); |
a0aad537 | 645 | #endif |
86299109 | 646 | |
de0d863e DB |
647 | /* Don't report the event. */ |
648 | return 1; | |
24a09b5f | 649 | } |
c269dbdb DB |
650 | else if (event == PTRACE_EVENT_VFORK_DONE) |
651 | { | |
652 | event_lwp->waitstatus.kind = TARGET_WAITKIND_VFORK_DONE; | |
653 | ||
2e7b624b YQ |
654 | if (event_lwp->bp_reinsert != 0 && can_software_single_step ()) |
655 | { | |
3b9a79ef | 656 | reinsert_single_step_breakpoints (event_thr); |
2e7b624b | 657 | |
3b9a79ef | 658 | gdb_assert (has_single_step_breakpoints (event_thr)); |
2e7b624b YQ |
659 | } |
660 | ||
c269dbdb DB |
661 | /* Report the event. */ |
662 | return 0; | |
663 | } | |
c12a5089 | 664 | else if (event == PTRACE_EVENT_EXEC && cs.report_exec_events) |
94585166 DB |
665 | { |
666 | struct process_info *proc; | |
f27866ba | 667 | std::vector<int> syscalls_to_catch; |
94585166 DB |
668 | ptid_t event_ptid; |
669 | pid_t event_pid; | |
670 | ||
671 | if (debug_threads) | |
672 | { | |
673 | debug_printf ("HEW: Got exec event from LWP %ld\n", | |
674 | lwpid_of (event_thr)); | |
675 | } | |
676 | ||
677 | /* Get the event ptid. */ | |
678 | event_ptid = ptid_of (event_thr); | |
e99b03dc | 679 | event_pid = event_ptid.pid (); |
94585166 | 680 | |
82075af2 | 681 | /* Save the syscall list from the execing process. */ |
94585166 | 682 | proc = get_thread_process (event_thr); |
f27866ba | 683 | syscalls_to_catch = std::move (proc->syscalls_to_catch); |
82075af2 JS |
684 | |
685 | /* Delete the execing process and all its threads. */ | |
d16f3f6c | 686 | mourn (proc); |
94585166 DB |
687 | current_thread = NULL; |
688 | ||
689 | /* Create a new process/lwp/thread. */ | |
690 | proc = linux_add_process (event_pid, 0); | |
691 | event_lwp = add_lwp (event_ptid); | |
692 | event_thr = get_lwp_thread (event_lwp); | |
693 | gdb_assert (current_thread == event_thr); | |
797bcff5 | 694 | arch_setup_thread (event_thr); |
94585166 DB |
695 | |
696 | /* Set the event status. */ | |
697 | event_lwp->waitstatus.kind = TARGET_WAITKIND_EXECD; | |
698 | event_lwp->waitstatus.value.execd_pathname | |
699 | = xstrdup (linux_proc_pid_to_exec_file (lwpid_of (event_thr))); | |
700 | ||
701 | /* Mark the exec status as pending. */ | |
702 | event_lwp->stopped = 1; | |
703 | event_lwp->status_pending_p = 1; | |
704 | event_lwp->status_pending = wstat; | |
705 | event_thr->last_resume_kind = resume_continue; | |
706 | event_thr->last_status.kind = TARGET_WAITKIND_IGNORE; | |
707 | ||
82075af2 JS |
708 | /* Update syscall state in the new lwp, effectively mid-syscall too. */ |
709 | event_lwp->syscall_state = TARGET_WAITKIND_SYSCALL_ENTRY; | |
710 | ||
711 | /* Restore the list to catch. Don't rely on the client, which is free | |
712 | to avoid sending a new list when the architecture doesn't change. | |
713 | Also, for ANY_SYSCALL, the architecture doesn't really matter. */ | |
f27866ba | 714 | proc->syscalls_to_catch = std::move (syscalls_to_catch); |
82075af2 | 715 | |
94585166 DB |
716 | /* Report the event. */ |
717 | *orig_event_lwp = event_lwp; | |
718 | return 0; | |
719 | } | |
de0d863e DB |
720 | |
721 | internal_error (__FILE__, __LINE__, _("unknown ptrace event %d"), event); | |
24a09b5f DJ |
722 | } |
723 | ||
df95181f TBA |
724 | CORE_ADDR |
725 | linux_process_target::get_pc (lwp_info *lwp) | |
d50171e4 | 726 | { |
0bfdf32f | 727 | struct thread_info *saved_thread; |
d50171e4 PA |
728 | struct regcache *regcache; |
729 | CORE_ADDR pc; | |
730 | ||
731 | if (the_low_target.get_pc == NULL) | |
732 | return 0; | |
733 | ||
0bfdf32f GB |
734 | saved_thread = current_thread; |
735 | current_thread = get_lwp_thread (lwp); | |
d50171e4 | 736 | |
0bfdf32f | 737 | regcache = get_thread_regcache (current_thread, 1); |
d50171e4 PA |
738 | pc = (*the_low_target.get_pc) (regcache); |
739 | ||
740 | if (debug_threads) | |
87ce2a04 | 741 | debug_printf ("pc is 0x%lx\n", (long) pc); |
d50171e4 | 742 | |
0bfdf32f | 743 | current_thread = saved_thread; |
d50171e4 PA |
744 | return pc; |
745 | } | |
746 | ||
82075af2 | 747 | /* This function should only be called if LWP got a SYSCALL_SIGTRAP. |
4cc32bec | 748 | Fill *SYSNO with the syscall nr trapped. */ |
82075af2 JS |
749 | |
750 | static void | |
4cc32bec | 751 | get_syscall_trapinfo (struct lwp_info *lwp, int *sysno) |
82075af2 JS |
752 | { |
753 | struct thread_info *saved_thread; | |
754 | struct regcache *regcache; | |
755 | ||
756 | if (the_low_target.get_syscall_trapinfo == NULL) | |
757 | { | |
758 | /* If we cannot get the syscall trapinfo, report an unknown | |
4cc32bec | 759 | system call number. */ |
82075af2 | 760 | *sysno = UNKNOWN_SYSCALL; |
82075af2 JS |
761 | return; |
762 | } | |
763 | ||
764 | saved_thread = current_thread; | |
765 | current_thread = get_lwp_thread (lwp); | |
766 | ||
767 | regcache = get_thread_regcache (current_thread, 1); | |
4cc32bec | 768 | (*the_low_target.get_syscall_trapinfo) (regcache, sysno); |
82075af2 JS |
769 | |
770 | if (debug_threads) | |
4cc32bec | 771 | debug_printf ("get_syscall_trapinfo sysno %d\n", *sysno); |
82075af2 JS |
772 | |
773 | current_thread = saved_thread; | |
774 | } | |
775 | ||
e7ad2f14 | 776 | static int check_stopped_by_watchpoint (struct lwp_info *child); |
0d62e5e8 | 777 | |
df95181f TBA |
778 | bool |
779 | linux_process_target::save_stop_reason (lwp_info *lwp) | |
0d62e5e8 | 780 | { |
582511be PA |
781 | CORE_ADDR pc; |
782 | CORE_ADDR sw_breakpoint_pc; | |
783 | struct thread_info *saved_thread; | |
3e572f71 PA |
784 | #if USE_SIGTRAP_SIGINFO |
785 | siginfo_t siginfo; | |
786 | #endif | |
d50171e4 PA |
787 | |
788 | if (the_low_target.get_pc == NULL) | |
df95181f | 789 | return false; |
0d62e5e8 | 790 | |
582511be PA |
791 | pc = get_pc (lwp); |
792 | sw_breakpoint_pc = pc - the_low_target.decr_pc_after_break; | |
d50171e4 | 793 | |
582511be PA |
794 | /* breakpoint_at reads from the current thread. */ |
795 | saved_thread = current_thread; | |
796 | current_thread = get_lwp_thread (lwp); | |
47c0c975 | 797 | |
3e572f71 PA |
798 | #if USE_SIGTRAP_SIGINFO |
799 | if (ptrace (PTRACE_GETSIGINFO, lwpid_of (current_thread), | |
800 | (PTRACE_TYPE_ARG3) 0, &siginfo) == 0) | |
801 | { | |
802 | if (siginfo.si_signo == SIGTRAP) | |
803 | { | |
e7ad2f14 PA |
804 | if (GDB_ARCH_IS_TRAP_BRKPT (siginfo.si_code) |
805 | && GDB_ARCH_IS_TRAP_HWBKPT (siginfo.si_code)) | |
3e572f71 | 806 | { |
e7ad2f14 PA |
807 | /* The si_code is ambiguous on this arch -- check debug |
808 | registers. */ | |
809 | if (!check_stopped_by_watchpoint (lwp)) | |
810 | lwp->stop_reason = TARGET_STOPPED_BY_SW_BREAKPOINT; | |
811 | } | |
812 | else if (GDB_ARCH_IS_TRAP_BRKPT (siginfo.si_code)) | |
813 | { | |
814 | /* If we determine the LWP stopped for a SW breakpoint, | |
815 | trust it. Particularly don't check watchpoint | |
816 | registers, because at least on s390, we'd find | |
817 | stopped-by-watchpoint as long as there's a watchpoint | |
818 | set. */ | |
3e572f71 | 819 | lwp->stop_reason = TARGET_STOPPED_BY_SW_BREAKPOINT; |
3e572f71 | 820 | } |
e7ad2f14 | 821 | else if (GDB_ARCH_IS_TRAP_HWBKPT (siginfo.si_code)) |
3e572f71 | 822 | { |
e7ad2f14 PA |
823 | /* This can indicate either a hardware breakpoint or |
824 | hardware watchpoint. Check debug registers. */ | |
825 | if (!check_stopped_by_watchpoint (lwp)) | |
826 | lwp->stop_reason = TARGET_STOPPED_BY_HW_BREAKPOINT; | |
3e572f71 | 827 | } |
2bf6fb9d PA |
828 | else if (siginfo.si_code == TRAP_TRACE) |
829 | { | |
e7ad2f14 PA |
830 | /* We may have single stepped an instruction that |
831 | triggered a watchpoint. In that case, on some | |
832 | architectures (such as x86), instead of TRAP_HWBKPT, | |
833 | si_code indicates TRAP_TRACE, and we need to check | |
834 | the debug registers separately. */ | |
835 | if (!check_stopped_by_watchpoint (lwp)) | |
836 | lwp->stop_reason = TARGET_STOPPED_BY_SINGLE_STEP; | |
2bf6fb9d | 837 | } |
3e572f71 PA |
838 | } |
839 | } | |
840 | #else | |
582511be PA |
841 | /* We may have just stepped a breakpoint instruction. E.g., in |
842 | non-stop mode, GDB first tells the thread A to step a range, and | |
843 | then the user inserts a breakpoint inside the range. In that | |
8090aef2 PA |
844 | case we need to report the breakpoint PC. */ |
845 | if ((!lwp->stepping || lwp->stop_pc == sw_breakpoint_pc) | |
582511be | 846 | && (*the_low_target.breakpoint_at) (sw_breakpoint_pc)) |
e7ad2f14 PA |
847 | lwp->stop_reason = TARGET_STOPPED_BY_SW_BREAKPOINT; |
848 | ||
849 | if (hardware_breakpoint_inserted_here (pc)) | |
850 | lwp->stop_reason = TARGET_STOPPED_BY_HW_BREAKPOINT; | |
851 | ||
852 | if (lwp->stop_reason == TARGET_STOPPED_BY_NO_REASON) | |
853 | check_stopped_by_watchpoint (lwp); | |
854 | #endif | |
855 | ||
856 | if (lwp->stop_reason == TARGET_STOPPED_BY_SW_BREAKPOINT) | |
582511be PA |
857 | { |
858 | if (debug_threads) | |
859 | { | |
860 | struct thread_info *thr = get_lwp_thread (lwp); | |
861 | ||
862 | debug_printf ("CSBB: %s stopped by software breakpoint\n", | |
863 | target_pid_to_str (ptid_of (thr))); | |
864 | } | |
865 | ||
866 | /* Back up the PC if necessary. */ | |
867 | if (pc != sw_breakpoint_pc) | |
e7ad2f14 | 868 | { |
582511be PA |
869 | struct regcache *regcache |
870 | = get_thread_regcache (current_thread, 1); | |
871 | (*the_low_target.set_pc) (regcache, sw_breakpoint_pc); | |
872 | } | |
873 | ||
e7ad2f14 PA |
874 | /* Update this so we record the correct stop PC below. */ |
875 | pc = sw_breakpoint_pc; | |
582511be | 876 | } |
e7ad2f14 | 877 | else if (lwp->stop_reason == TARGET_STOPPED_BY_HW_BREAKPOINT) |
582511be PA |
878 | { |
879 | if (debug_threads) | |
880 | { | |
881 | struct thread_info *thr = get_lwp_thread (lwp); | |
882 | ||
883 | debug_printf ("CSBB: %s stopped by hardware breakpoint\n", | |
884 | target_pid_to_str (ptid_of (thr))); | |
885 | } | |
e7ad2f14 PA |
886 | } |
887 | else if (lwp->stop_reason == TARGET_STOPPED_BY_WATCHPOINT) | |
888 | { | |
889 | if (debug_threads) | |
890 | { | |
891 | struct thread_info *thr = get_lwp_thread (lwp); | |
47c0c975 | 892 | |
e7ad2f14 PA |
893 | debug_printf ("CSBB: %s stopped by hardware watchpoint\n", |
894 | target_pid_to_str (ptid_of (thr))); | |
895 | } | |
582511be | 896 | } |
e7ad2f14 PA |
897 | else if (lwp->stop_reason == TARGET_STOPPED_BY_SINGLE_STEP) |
898 | { | |
899 | if (debug_threads) | |
900 | { | |
901 | struct thread_info *thr = get_lwp_thread (lwp); | |
582511be | 902 | |
e7ad2f14 PA |
903 | debug_printf ("CSBB: %s stopped by trace\n", |
904 | target_pid_to_str (ptid_of (thr))); | |
905 | } | |
906 | } | |
907 | ||
908 | lwp->stop_pc = pc; | |
582511be | 909 | current_thread = saved_thread; |
df95181f | 910 | return true; |
0d62e5e8 | 911 | } |
ce3a066d | 912 | |
b3312d80 | 913 | static struct lwp_info * |
95954743 | 914 | add_lwp (ptid_t ptid) |
611cb4a5 | 915 | { |
54a0b537 | 916 | struct lwp_info *lwp; |
0d62e5e8 | 917 | |
8d749320 | 918 | lwp = XCNEW (struct lwp_info); |
00db26fa PA |
919 | |
920 | lwp->waitstatus.kind = TARGET_WAITKIND_IGNORE; | |
0d62e5e8 | 921 | |
754e3168 AH |
922 | lwp->thread = add_thread (ptid, lwp); |
923 | ||
aa5ca48f | 924 | if (the_low_target.new_thread != NULL) |
34c703da | 925 | the_low_target.new_thread (lwp); |
aa5ca48f | 926 | |
54a0b537 | 927 | return lwp; |
0d62e5e8 | 928 | } |
611cb4a5 | 929 | |
2090129c SDJ |
930 | /* Callback to be used when calling fork_inferior, responsible for |
931 | actually initiating the tracing of the inferior. */ | |
932 | ||
933 | static void | |
934 | linux_ptrace_fun () | |
935 | { | |
936 | if (ptrace (PTRACE_TRACEME, 0, (PTRACE_TYPE_ARG3) 0, | |
937 | (PTRACE_TYPE_ARG4) 0) < 0) | |
50fa3001 | 938 | trace_start_error_with_name ("ptrace"); |
2090129c SDJ |
939 | |
940 | if (setpgid (0, 0) < 0) | |
941 | trace_start_error_with_name ("setpgid"); | |
942 | ||
943 | /* If GDBserver is connected to gdb via stdio, redirect the inferior's | |
944 | stdout to stderr so that inferior i/o doesn't corrupt the connection. | |
945 | Also, redirect stdin to /dev/null. */ | |
946 | if (remote_connection_is_stdio ()) | |
947 | { | |
948 | if (close (0) < 0) | |
949 | trace_start_error_with_name ("close"); | |
950 | if (open ("/dev/null", O_RDONLY) < 0) | |
951 | trace_start_error_with_name ("open"); | |
952 | if (dup2 (2, 1) < 0) | |
953 | trace_start_error_with_name ("dup2"); | |
954 | if (write (2, "stdin/stdout redirected\n", | |
955 | sizeof ("stdin/stdout redirected\n") - 1) < 0) | |
956 | { | |
957 | /* Errors ignored. */; | |
958 | } | |
959 | } | |
960 | } | |
961 | ||
da6d8c04 | 962 | /* Start an inferior process and returns its pid. |
2090129c SDJ |
963 | PROGRAM is the name of the program to be started, and PROGRAM_ARGS |
964 | are its arguments. */ | |
da6d8c04 | 965 | |
15295543 TBA |
966 | int |
967 | linux_process_target::create_inferior (const char *program, | |
968 | const std::vector<char *> &program_args) | |
da6d8c04 | 969 | { |
c12a5089 | 970 | client_state &cs = get_client_state (); |
a6dbe5df | 971 | struct lwp_info *new_lwp; |
da6d8c04 | 972 | int pid; |
95954743 | 973 | ptid_t ptid; |
03583c20 | 974 | |
41272101 TT |
975 | { |
976 | maybe_disable_address_space_randomization restore_personality | |
c12a5089 | 977 | (cs.disable_randomization); |
41272101 TT |
978 | std::string str_program_args = stringify_argv (program_args); |
979 | ||
980 | pid = fork_inferior (program, | |
981 | str_program_args.c_str (), | |
982 | get_environ ()->envp (), linux_ptrace_fun, | |
983 | NULL, NULL, NULL, NULL); | |
984 | } | |
03583c20 | 985 | |
55d7b841 | 986 | linux_add_process (pid, 0); |
95954743 | 987 | |
fd79271b | 988 | ptid = ptid_t (pid, pid, 0); |
95954743 | 989 | new_lwp = add_lwp (ptid); |
a6dbe5df | 990 | new_lwp->must_set_ptrace_flags = 1; |
611cb4a5 | 991 | |
2090129c SDJ |
992 | post_fork_inferior (pid, program); |
993 | ||
a9fa9f7d | 994 | return pid; |
da6d8c04 DJ |
995 | } |
996 | ||
ece66d65 JS |
997 | /* Implement the post_create_inferior target_ops method. */ |
998 | ||
6dee9afb TBA |
999 | void |
1000 | linux_process_target::post_create_inferior () | |
ece66d65 JS |
1001 | { |
1002 | struct lwp_info *lwp = get_thread_lwp (current_thread); | |
1003 | ||
797bcff5 | 1004 | low_arch_setup (); |
ece66d65 JS |
1005 | |
1006 | if (lwp->must_set_ptrace_flags) | |
1007 | { | |
1008 | struct process_info *proc = current_process (); | |
1009 | int options = linux_low_ptrace_options (proc->attached); | |
1010 | ||
1011 | linux_enable_event_reporting (lwpid_of (current_thread), options); | |
1012 | lwp->must_set_ptrace_flags = 0; | |
1013 | } | |
1014 | } | |
1015 | ||
8784d563 PA |
1016 | /* Attach to an inferior process. Returns 0 on success, ERRNO on |
1017 | error. */ | |
da6d8c04 | 1018 | |
7ae1a6a6 PA |
1019 | int |
1020 | linux_attach_lwp (ptid_t ptid) | |
da6d8c04 | 1021 | { |
54a0b537 | 1022 | struct lwp_info *new_lwp; |
e38504b3 | 1023 | int lwpid = ptid.lwp (); |
611cb4a5 | 1024 | |
b8e1b30e | 1025 | if (ptrace (PTRACE_ATTACH, lwpid, (PTRACE_TYPE_ARG3) 0, (PTRACE_TYPE_ARG4) 0) |
56f7af9c | 1026 | != 0) |
7ae1a6a6 | 1027 | return errno; |
24a09b5f | 1028 | |
b3312d80 | 1029 | new_lwp = add_lwp (ptid); |
0d62e5e8 | 1030 | |
a6dbe5df PA |
1031 | /* We need to wait for SIGSTOP before being able to make the next |
1032 | ptrace call on this LWP. */ | |
1033 | new_lwp->must_set_ptrace_flags = 1; | |
1034 | ||
644cebc9 | 1035 | if (linux_proc_pid_is_stopped (lwpid)) |
c14d7ab2 PA |
1036 | { |
1037 | if (debug_threads) | |
87ce2a04 | 1038 | debug_printf ("Attached to a stopped process\n"); |
c14d7ab2 PA |
1039 | |
1040 | /* The process is definitely stopped. It is in a job control | |
1041 | stop, unless the kernel predates the TASK_STOPPED / | |
1042 | TASK_TRACED distinction, in which case it might be in a | |
1043 | ptrace stop. Make sure it is in a ptrace stop; from there we | |
1044 | can kill it, signal it, et cetera. | |
1045 | ||
1046 | First make sure there is a pending SIGSTOP. Since we are | |
1047 | already attached, the process can not transition from stopped | |
1048 | to running without a PTRACE_CONT; so we know this signal will | |
1049 | go into the queue. The SIGSTOP generated by PTRACE_ATTACH is | |
1050 | probably already in the queue (unless this kernel is old | |
1051 | enough to use TASK_STOPPED for ptrace stops); but since | |
1052 | SIGSTOP is not an RT signal, it can only be queued once. */ | |
1053 | kill_lwp (lwpid, SIGSTOP); | |
1054 | ||
1055 | /* Finally, resume the stopped process. This will deliver the | |
1056 | SIGSTOP (or a higher priority signal, just like normal | |
1057 | PTRACE_ATTACH), which we'll catch later on. */ | |
b8e1b30e | 1058 | ptrace (PTRACE_CONT, lwpid, (PTRACE_TYPE_ARG3) 0, (PTRACE_TYPE_ARG4) 0); |
c14d7ab2 PA |
1059 | } |
1060 | ||
0d62e5e8 | 1061 | /* The next time we wait for this LWP we'll see a SIGSTOP as PTRACE_ATTACH |
0e21c1ec DE |
1062 | brings it to a halt. |
1063 | ||
1064 | There are several cases to consider here: | |
1065 | ||
1066 | 1) gdbserver has already attached to the process and is being notified | |
1b3f6016 | 1067 | of a new thread that is being created. |
d50171e4 PA |
1068 | In this case we should ignore that SIGSTOP and resume the |
1069 | process. This is handled below by setting stop_expected = 1, | |
8336d594 | 1070 | and the fact that add_thread sets last_resume_kind == |
d50171e4 | 1071 | resume_continue. |
0e21c1ec DE |
1072 | |
1073 | 2) This is the first thread (the process thread), and we're attaching | |
1b3f6016 PA |
1074 | to it via attach_inferior. |
1075 | In this case we want the process thread to stop. | |
d50171e4 PA |
1076 | This is handled by having linux_attach set last_resume_kind == |
1077 | resume_stop after we return. | |
e3deef73 LM |
1078 | |
1079 | If the pid we are attaching to is also the tgid, we attach to and | |
1080 | stop all the existing threads. Otherwise, we attach to pid and | |
1081 | ignore any other threads in the same group as this pid. | |
0e21c1ec DE |
1082 | |
1083 | 3) GDB is connecting to gdbserver and is requesting an enumeration of all | |
1b3f6016 PA |
1084 | existing threads. |
1085 | In this case we want the thread to stop. | |
1086 | FIXME: This case is currently not properly handled. | |
1087 | We should wait for the SIGSTOP but don't. Things work apparently | |
1088 | because enough time passes between when we ptrace (ATTACH) and when | |
1089 | gdb makes the next ptrace call on the thread. | |
0d62e5e8 DJ |
1090 | |
1091 | On the other hand, if we are currently trying to stop all threads, we | |
1092 | should treat the new thread as if we had sent it a SIGSTOP. This works | |
54a0b537 | 1093 | because we are guaranteed that the add_lwp call above added us to the |
0e21c1ec DE |
1094 | end of the list, and so the new thread has not yet reached |
1095 | wait_for_sigstop (but will). */ | |
d50171e4 | 1096 | new_lwp->stop_expected = 1; |
0d62e5e8 | 1097 | |
7ae1a6a6 | 1098 | return 0; |
95954743 PA |
1099 | } |
1100 | ||
8784d563 PA |
1101 | /* Callback for linux_proc_attach_tgid_threads. Attach to PTID if not |
1102 | already attached. Returns true if a new LWP is found, false | |
1103 | otherwise. */ | |
1104 | ||
1105 | static int | |
1106 | attach_proc_task_lwp_callback (ptid_t ptid) | |
1107 | { | |
1108 | /* Is this a new thread? */ | |
1109 | if (find_thread_ptid (ptid) == NULL) | |
1110 | { | |
e38504b3 | 1111 | int lwpid = ptid.lwp (); |
8784d563 PA |
1112 | int err; |
1113 | ||
1114 | if (debug_threads) | |
1115 | debug_printf ("Found new lwp %d\n", lwpid); | |
1116 | ||
1117 | err = linux_attach_lwp (ptid); | |
1118 | ||
1119 | /* Be quiet if we simply raced with the thread exiting. EPERM | |
1120 | is returned if the thread's task still exists, and is marked | |
1121 | as exited or zombie, as well as other conditions, so in that | |
1122 | case, confirm the status in /proc/PID/status. */ | |
1123 | if (err == ESRCH | |
1124 | || (err == EPERM && linux_proc_pid_is_gone (lwpid))) | |
1125 | { | |
1126 | if (debug_threads) | |
1127 | { | |
1128 | debug_printf ("Cannot attach to lwp %d: " | |
1129 | "thread is gone (%d: %s)\n", | |
6d91ce9a | 1130 | lwpid, err, safe_strerror (err)); |
8784d563 PA |
1131 | } |
1132 | } | |
1133 | else if (err != 0) | |
1134 | { | |
4d9b86e1 | 1135 | std::string reason |
50fa3001 | 1136 | = linux_ptrace_attach_fail_reason_string (ptid, err); |
4d9b86e1 SM |
1137 | |
1138 | warning (_("Cannot attach to lwp %d: %s"), lwpid, reason.c_str ()); | |
8784d563 PA |
1139 | } |
1140 | ||
1141 | return 1; | |
1142 | } | |
1143 | return 0; | |
1144 | } | |
1145 | ||
500c1d85 PA |
1146 | static void async_file_mark (void); |
1147 | ||
e3deef73 LM |
1148 | /* Attach to PID. If PID is the tgid, attach to it and all |
1149 | of its threads. */ | |
1150 | ||
ef03dad8 TBA |
1151 | int |
1152 | linux_process_target::attach (unsigned long pid) | |
0d62e5e8 | 1153 | { |
500c1d85 PA |
1154 | struct process_info *proc; |
1155 | struct thread_info *initial_thread; | |
fd79271b | 1156 | ptid_t ptid = ptid_t (pid, pid, 0); |
7ae1a6a6 PA |
1157 | int err; |
1158 | ||
df0da8a2 AH |
1159 | proc = linux_add_process (pid, 1); |
1160 | ||
e3deef73 LM |
1161 | /* Attach to PID. We will check for other threads |
1162 | soon. */ | |
7ae1a6a6 PA |
1163 | err = linux_attach_lwp (ptid); |
1164 | if (err != 0) | |
4d9b86e1 | 1165 | { |
df0da8a2 | 1166 | remove_process (proc); |
4d9b86e1 | 1167 | |
50fa3001 SDJ |
1168 | std::string reason = linux_ptrace_attach_fail_reason_string (ptid, err); |
1169 | error ("Cannot attach to process %ld: %s", pid, reason.c_str ()); | |
4d9b86e1 | 1170 | } |
7ae1a6a6 | 1171 | |
500c1d85 PA |
1172 | /* Don't ignore the initial SIGSTOP if we just attached to this |
1173 | process. It will be collected by wait shortly. */ | |
fd79271b | 1174 | initial_thread = find_thread_ptid (ptid_t (pid, pid, 0)); |
500c1d85 | 1175 | initial_thread->last_resume_kind = resume_stop; |
0d62e5e8 | 1176 | |
8784d563 PA |
1177 | /* We must attach to every LWP. If /proc is mounted, use that to |
1178 | find them now. On the one hand, the inferior may be using raw | |
1179 | clone instead of using pthreads. On the other hand, even if it | |
1180 | is using pthreads, GDB may not be connected yet (thread_db needs | |
1181 | to do symbol lookups, through qSymbol). Also, thread_db walks | |
1182 | structures in the inferior's address space to find the list of | |
1183 | threads/LWPs, and those structures may well be corrupted. Note | |
1184 | that once thread_db is loaded, we'll still use it to list threads | |
1185 | and associate pthread info with each LWP. */ | |
1186 | linux_proc_attach_tgid_threads (pid, attach_proc_task_lwp_callback); | |
500c1d85 PA |
1187 | |
1188 | /* GDB will shortly read the xml target description for this | |
1189 | process, to figure out the process' architecture. But the target | |
1190 | description is only filled in when the first process/thread in | |
1191 | the thread group reports its initial PTRACE_ATTACH SIGSTOP. Do | |
1192 | that now, otherwise, if GDB is fast enough, it could read the | |
1193 | target description _before_ that initial stop. */ | |
1194 | if (non_stop) | |
1195 | { | |
1196 | struct lwp_info *lwp; | |
1197 | int wstat, lwpid; | |
f2907e49 | 1198 | ptid_t pid_ptid = ptid_t (pid); |
500c1d85 | 1199 | |
d16f3f6c | 1200 | lwpid = wait_for_event_filtered (pid_ptid, pid_ptid, &wstat, __WALL); |
500c1d85 PA |
1201 | gdb_assert (lwpid > 0); |
1202 | ||
f2907e49 | 1203 | lwp = find_lwp_pid (ptid_t (lwpid)); |
500c1d85 PA |
1204 | |
1205 | if (!WIFSTOPPED (wstat) || WSTOPSIG (wstat) != SIGSTOP) | |
1206 | { | |
1207 | lwp->status_pending_p = 1; | |
1208 | lwp->status_pending = wstat; | |
1209 | } | |
1210 | ||
1211 | initial_thread->last_resume_kind = resume_continue; | |
1212 | ||
1213 | async_file_mark (); | |
1214 | ||
1215 | gdb_assert (proc->tdesc != NULL); | |
1216 | } | |
1217 | ||
95954743 PA |
1218 | return 0; |
1219 | } | |
1220 | ||
95954743 | 1221 | static int |
e4eb0dec | 1222 | last_thread_of_process_p (int pid) |
95954743 | 1223 | { |
e4eb0dec | 1224 | bool seen_one = false; |
95954743 | 1225 | |
da4ae14a | 1226 | thread_info *thread = find_thread (pid, [&] (thread_info *thr_arg) |
95954743 | 1227 | { |
e4eb0dec SM |
1228 | if (!seen_one) |
1229 | { | |
1230 | /* This is the first thread of this process we see. */ | |
1231 | seen_one = true; | |
1232 | return false; | |
1233 | } | |
1234 | else | |
1235 | { | |
1236 | /* This is the second thread of this process we see. */ | |
1237 | return true; | |
1238 | } | |
1239 | }); | |
da6d8c04 | 1240 | |
e4eb0dec | 1241 | return thread == NULL; |
95954743 PA |
1242 | } |
1243 | ||
da84f473 PA |
1244 | /* Kill LWP. */ |
1245 | ||
1246 | static void | |
1247 | linux_kill_one_lwp (struct lwp_info *lwp) | |
1248 | { | |
d86d4aaf DE |
1249 | struct thread_info *thr = get_lwp_thread (lwp); |
1250 | int pid = lwpid_of (thr); | |
da84f473 PA |
1251 | |
1252 | /* PTRACE_KILL is unreliable. After stepping into a signal handler, | |
1253 | there is no signal context, and ptrace(PTRACE_KILL) (or | |
1254 | ptrace(PTRACE_CONT, SIGKILL), pretty much the same) acts like | |
1255 | ptrace(CONT, pid, 0,0) and just resumes the tracee. A better | |
1256 | alternative is to kill with SIGKILL. We only need one SIGKILL | |
1257 | per process, not one for each thread. But since we still support | |
4a6ed09b PA |
1258 | support debugging programs using raw clone without CLONE_THREAD, |
1259 | we send one for each thread. For years, we used PTRACE_KILL | |
1260 | only, so we're being a bit paranoid about some old kernels where | |
1261 | PTRACE_KILL might work better (dubious if there are any such, but | |
1262 | that's why it's paranoia), so we try SIGKILL first, PTRACE_KILL | |
1263 | second, and so we're fine everywhere. */ | |
da84f473 PA |
1264 | |
1265 | errno = 0; | |
69ff6be5 | 1266 | kill_lwp (pid, SIGKILL); |
da84f473 | 1267 | if (debug_threads) |
ce9e3fe7 PA |
1268 | { |
1269 | int save_errno = errno; | |
1270 | ||
1271 | debug_printf ("LKL: kill_lwp (SIGKILL) %s, 0, 0 (%s)\n", | |
1272 | target_pid_to_str (ptid_of (thr)), | |
6d91ce9a | 1273 | save_errno ? safe_strerror (save_errno) : "OK"); |
ce9e3fe7 | 1274 | } |
da84f473 PA |
1275 | |
1276 | errno = 0; | |
b8e1b30e | 1277 | ptrace (PTRACE_KILL, pid, (PTRACE_TYPE_ARG3) 0, (PTRACE_TYPE_ARG4) 0); |
da84f473 | 1278 | if (debug_threads) |
ce9e3fe7 PA |
1279 | { |
1280 | int save_errno = errno; | |
1281 | ||
1282 | debug_printf ("LKL: PTRACE_KILL %s, 0, 0 (%s)\n", | |
1283 | target_pid_to_str (ptid_of (thr)), | |
6d91ce9a | 1284 | save_errno ? safe_strerror (save_errno) : "OK"); |
ce9e3fe7 | 1285 | } |
da84f473 PA |
1286 | } |
1287 | ||
e76126e8 PA |
1288 | /* Kill LWP and wait for it to die. */ |
1289 | ||
1290 | static void | |
1291 | kill_wait_lwp (struct lwp_info *lwp) | |
1292 | { | |
1293 | struct thread_info *thr = get_lwp_thread (lwp); | |
e99b03dc | 1294 | int pid = ptid_of (thr).pid (); |
e38504b3 | 1295 | int lwpid = ptid_of (thr).lwp (); |
e76126e8 PA |
1296 | int wstat; |
1297 | int res; | |
1298 | ||
1299 | if (debug_threads) | |
1300 | debug_printf ("kwl: killing lwp %d, for pid: %d\n", lwpid, pid); | |
1301 | ||
1302 | do | |
1303 | { | |
1304 | linux_kill_one_lwp (lwp); | |
1305 | ||
1306 | /* Make sure it died. Notes: | |
1307 | ||
1308 | - The loop is most likely unnecessary. | |
1309 | ||
d16f3f6c | 1310 | - We don't use wait_for_event as that could delete lwps |
e76126e8 PA |
1311 | while we're iterating over them. We're not interested in |
1312 | any pending status at this point, only in making sure all | |
1313 | wait status on the kernel side are collected until the | |
1314 | process is reaped. | |
1315 | ||
1316 | - We don't use __WALL here as the __WALL emulation relies on | |
1317 | SIGCHLD, and killing a stopped process doesn't generate | |
1318 | one, nor an exit status. | |
1319 | */ | |
1320 | res = my_waitpid (lwpid, &wstat, 0); | |
1321 | if (res == -1 && errno == ECHILD) | |
1322 | res = my_waitpid (lwpid, &wstat, __WCLONE); | |
1323 | } while (res > 0 && WIFSTOPPED (wstat)); | |
1324 | ||
586b02a9 PA |
1325 | /* Even if it was stopped, the child may have already disappeared. |
1326 | E.g., if it was killed by SIGKILL. */ | |
1327 | if (res < 0 && errno != ECHILD) | |
1328 | perror_with_name ("kill_wait_lwp"); | |
e76126e8 PA |
1329 | } |
1330 | ||
578290ec | 1331 | /* Callback for `for_each_thread'. Kills an lwp of a given process, |
da84f473 | 1332 | except the leader. */ |
95954743 | 1333 | |
578290ec SM |
1334 | static void |
1335 | kill_one_lwp_callback (thread_info *thread, int pid) | |
da6d8c04 | 1336 | { |
54a0b537 | 1337 | struct lwp_info *lwp = get_thread_lwp (thread); |
0d62e5e8 | 1338 | |
fd500816 DJ |
1339 | /* We avoid killing the first thread here, because of a Linux kernel (at |
1340 | least 2.6.0-test7 through 2.6.8-rc4) bug; if we kill the parent before | |
1341 | the children get a chance to be reaped, it will remain a zombie | |
1342 | forever. */ | |
95954743 | 1343 | |
d86d4aaf | 1344 | if (lwpid_of (thread) == pid) |
95954743 PA |
1345 | { |
1346 | if (debug_threads) | |
87ce2a04 | 1347 | debug_printf ("lkop: is last of process %s\n", |
9c80ecd6 | 1348 | target_pid_to_str (thread->id)); |
578290ec | 1349 | return; |
95954743 | 1350 | } |
fd500816 | 1351 | |
e76126e8 | 1352 | kill_wait_lwp (lwp); |
da6d8c04 DJ |
1353 | } |
1354 | ||
c6885a57 TBA |
1355 | int |
1356 | linux_process_target::kill (process_info *process) | |
0d62e5e8 | 1357 | { |
a780ef4f | 1358 | int pid = process->pid; |
9d606399 | 1359 | |
f9e39928 PA |
1360 | /* If we're killing a running inferior, make sure it is stopped |
1361 | first, as PTRACE_KILL will not work otherwise. */ | |
7984d532 | 1362 | stop_all_lwps (0, NULL); |
f9e39928 | 1363 | |
578290ec SM |
1364 | for_each_thread (pid, [&] (thread_info *thread) |
1365 | { | |
1366 | kill_one_lwp_callback (thread, pid); | |
1367 | }); | |
fd500816 | 1368 | |
54a0b537 | 1369 | /* See the comment in linux_kill_one_lwp. We did not kill the first |
fd500816 | 1370 | thread in the list, so do so now. */ |
a780ef4f | 1371 | lwp_info *lwp = find_lwp_pid (ptid_t (pid)); |
bd99dc85 | 1372 | |
784867a5 | 1373 | if (lwp == NULL) |
fd500816 | 1374 | { |
784867a5 | 1375 | if (debug_threads) |
d86d4aaf DE |
1376 | debug_printf ("lk_1: cannot find lwp for pid: %d\n", |
1377 | pid); | |
784867a5 JK |
1378 | } |
1379 | else | |
e76126e8 | 1380 | kill_wait_lwp (lwp); |
2d717e4f | 1381 | |
8adb37b9 | 1382 | mourn (process); |
f9e39928 PA |
1383 | |
1384 | /* Since we presently can only stop all lwps of all processes, we | |
1385 | need to unstop lwps of other processes. */ | |
7984d532 | 1386 | unstop_all_lwps (0, NULL); |
95954743 | 1387 | return 0; |
0d62e5e8 DJ |
1388 | } |
1389 | ||
9b224c5e PA |
1390 | /* Get pending signal of THREAD, for detaching purposes. This is the |
1391 | signal the thread last stopped for, which we need to deliver to the | |
1392 | thread when detaching, otherwise, it'd be suppressed/lost. */ | |
1393 | ||
1394 | static int | |
1395 | get_detach_signal (struct thread_info *thread) | |
1396 | { | |
c12a5089 | 1397 | client_state &cs = get_client_state (); |
a493e3e2 | 1398 | enum gdb_signal signo = GDB_SIGNAL_0; |
9b224c5e PA |
1399 | int status; |
1400 | struct lwp_info *lp = get_thread_lwp (thread); | |
1401 | ||
1402 | if (lp->status_pending_p) | |
1403 | status = lp->status_pending; | |
1404 | else | |
1405 | { | |
1406 | /* If the thread had been suspended by gdbserver, and it stopped | |
1407 | cleanly, then it'll have stopped with SIGSTOP. But we don't | |
1408 | want to deliver that SIGSTOP. */ | |
1409 | if (thread->last_status.kind != TARGET_WAITKIND_STOPPED | |
a493e3e2 | 1410 | || thread->last_status.value.sig == GDB_SIGNAL_0) |
9b224c5e PA |
1411 | return 0; |
1412 | ||
1413 | /* Otherwise, we may need to deliver the signal we | |
1414 | intercepted. */ | |
1415 | status = lp->last_status; | |
1416 | } | |
1417 | ||
1418 | if (!WIFSTOPPED (status)) | |
1419 | { | |
1420 | if (debug_threads) | |
87ce2a04 | 1421 | debug_printf ("GPS: lwp %s hasn't stopped: no pending signal\n", |
d86d4aaf | 1422 | target_pid_to_str (ptid_of (thread))); |
9b224c5e PA |
1423 | return 0; |
1424 | } | |
1425 | ||
1426 | /* Extended wait statuses aren't real SIGTRAPs. */ | |
89a5711c | 1427 | if (WSTOPSIG (status) == SIGTRAP && linux_is_extended_waitstatus (status)) |
9b224c5e PA |
1428 | { |
1429 | if (debug_threads) | |
87ce2a04 DE |
1430 | debug_printf ("GPS: lwp %s had stopped with extended " |
1431 | "status: no pending signal\n", | |
d86d4aaf | 1432 | target_pid_to_str (ptid_of (thread))); |
9b224c5e PA |
1433 | return 0; |
1434 | } | |
1435 | ||
2ea28649 | 1436 | signo = gdb_signal_from_host (WSTOPSIG (status)); |
9b224c5e | 1437 | |
c12a5089 | 1438 | if (cs.program_signals_p && !cs.program_signals[signo]) |
9b224c5e PA |
1439 | { |
1440 | if (debug_threads) | |
87ce2a04 | 1441 | debug_printf ("GPS: lwp %s had signal %s, but it is in nopass state\n", |
d86d4aaf | 1442 | target_pid_to_str (ptid_of (thread)), |
87ce2a04 | 1443 | gdb_signal_to_string (signo)); |
9b224c5e PA |
1444 | return 0; |
1445 | } | |
c12a5089 | 1446 | else if (!cs.program_signals_p |
9b224c5e PA |
1447 | /* If we have no way to know which signals GDB does not |
1448 | want to have passed to the program, assume | |
1449 | SIGTRAP/SIGINT, which is GDB's default. */ | |
a493e3e2 | 1450 | && (signo == GDB_SIGNAL_TRAP || signo == GDB_SIGNAL_INT)) |
9b224c5e PA |
1451 | { |
1452 | if (debug_threads) | |
87ce2a04 DE |
1453 | debug_printf ("GPS: lwp %s had signal %s, " |
1454 | "but we don't know if we should pass it. " | |
1455 | "Default to not.\n", | |
d86d4aaf | 1456 | target_pid_to_str (ptid_of (thread)), |
87ce2a04 | 1457 | gdb_signal_to_string (signo)); |
9b224c5e PA |
1458 | return 0; |
1459 | } | |
1460 | else | |
1461 | { | |
1462 | if (debug_threads) | |
87ce2a04 | 1463 | debug_printf ("GPS: lwp %s has pending signal %s: delivering it.\n", |
d86d4aaf | 1464 | target_pid_to_str (ptid_of (thread)), |
87ce2a04 | 1465 | gdb_signal_to_string (signo)); |
9b224c5e PA |
1466 | |
1467 | return WSTOPSIG (status); | |
1468 | } | |
1469 | } | |
1470 | ||
ced2dffb PA |
1471 | /* Detach from LWP. */ |
1472 | ||
1473 | static void | |
1474 | linux_detach_one_lwp (struct lwp_info *lwp) | |
6ad8ae5c | 1475 | { |
ced2dffb | 1476 | struct thread_info *thread = get_lwp_thread (lwp); |
9b224c5e | 1477 | int sig; |
ced2dffb | 1478 | int lwpid; |
6ad8ae5c | 1479 | |
9b224c5e | 1480 | /* If there is a pending SIGSTOP, get rid of it. */ |
54a0b537 | 1481 | if (lwp->stop_expected) |
ae13219e | 1482 | { |
9b224c5e | 1483 | if (debug_threads) |
87ce2a04 | 1484 | debug_printf ("Sending SIGCONT to %s\n", |
d86d4aaf | 1485 | target_pid_to_str (ptid_of (thread))); |
9b224c5e | 1486 | |
d86d4aaf | 1487 | kill_lwp (lwpid_of (thread), SIGCONT); |
54a0b537 | 1488 | lwp->stop_expected = 0; |
ae13219e DJ |
1489 | } |
1490 | ||
9b224c5e PA |
1491 | /* Pass on any pending signal for this thread. */ |
1492 | sig = get_detach_signal (thread); | |
1493 | ||
ced2dffb PA |
1494 | /* Preparing to resume may try to write registers, and fail if the |
1495 | lwp is zombie. If that happens, ignore the error. We'll handle | |
1496 | it below, when detach fails with ESRCH. */ | |
a70b8144 | 1497 | try |
ced2dffb PA |
1498 | { |
1499 | /* Flush any pending changes to the process's registers. */ | |
1500 | regcache_invalidate_thread (thread); | |
1501 | ||
1502 | /* Finally, let it resume. */ | |
1503 | if (the_low_target.prepare_to_resume != NULL) | |
1504 | the_low_target.prepare_to_resume (lwp); | |
1505 | } | |
230d2906 | 1506 | catch (const gdb_exception_error &ex) |
ced2dffb PA |
1507 | { |
1508 | if (!check_ptrace_stopped_lwp_gone (lwp)) | |
eedc3f4f | 1509 | throw; |
ced2dffb | 1510 | } |
ced2dffb PA |
1511 | |
1512 | lwpid = lwpid_of (thread); | |
1513 | if (ptrace (PTRACE_DETACH, lwpid, (PTRACE_TYPE_ARG3) 0, | |
b8e1b30e | 1514 | (PTRACE_TYPE_ARG4) (long) sig) < 0) |
ced2dffb PA |
1515 | { |
1516 | int save_errno = errno; | |
1517 | ||
1518 | /* We know the thread exists, so ESRCH must mean the lwp is | |
1519 | zombie. This can happen if one of the already-detached | |
1520 | threads exits the whole thread group. In that case we're | |
1521 | still attached, and must reap the lwp. */ | |
1522 | if (save_errno == ESRCH) | |
1523 | { | |
1524 | int ret, status; | |
1525 | ||
1526 | ret = my_waitpid (lwpid, &status, __WALL); | |
1527 | if (ret == -1) | |
1528 | { | |
1529 | warning (_("Couldn't reap LWP %d while detaching: %s"), | |
6d91ce9a | 1530 | lwpid, safe_strerror (errno)); |
ced2dffb PA |
1531 | } |
1532 | else if (!WIFEXITED (status) && !WIFSIGNALED (status)) | |
1533 | { | |
1534 | warning (_("Reaping LWP %d while detaching " | |
1535 | "returned unexpected status 0x%x"), | |
1536 | lwpid, status); | |
1537 | } | |
1538 | } | |
1539 | else | |
1540 | { | |
1541 | error (_("Can't detach %s: %s"), | |
1542 | target_pid_to_str (ptid_of (thread)), | |
6d91ce9a | 1543 | safe_strerror (save_errno)); |
ced2dffb PA |
1544 | } |
1545 | } | |
1546 | else if (debug_threads) | |
1547 | { | |
1548 | debug_printf ("PTRACE_DETACH (%s, %s, 0) (OK)\n", | |
1549 | target_pid_to_str (ptid_of (thread)), | |
1550 | strsignal (sig)); | |
1551 | } | |
bd99dc85 PA |
1552 | |
1553 | delete_lwp (lwp); | |
ced2dffb PA |
1554 | } |
1555 | ||
798a38e8 | 1556 | /* Callback for for_each_thread. Detaches from non-leader threads of a |
ced2dffb PA |
1557 | given process. */ |
1558 | ||
798a38e8 SM |
1559 | static void |
1560 | linux_detach_lwp_callback (thread_info *thread) | |
ced2dffb | 1561 | { |
ced2dffb PA |
1562 | /* We don't actually detach from the thread group leader just yet. |
1563 | If the thread group exits, we must reap the zombie clone lwps | |
1564 | before we're able to reap the leader. */ | |
798a38e8 SM |
1565 | if (thread->id.pid () == thread->id.lwp ()) |
1566 | return; | |
ced2dffb | 1567 | |
798a38e8 | 1568 | lwp_info *lwp = get_thread_lwp (thread); |
ced2dffb | 1569 | linux_detach_one_lwp (lwp); |
6ad8ae5c DJ |
1570 | } |
1571 | ||
9061c9cf TBA |
1572 | int |
1573 | linux_process_target::detach (process_info *process) | |
95954743 | 1574 | { |
ced2dffb | 1575 | struct lwp_info *main_lwp; |
95954743 | 1576 | |
863d01bd PA |
1577 | /* As there's a step over already in progress, let it finish first, |
1578 | otherwise nesting a stabilize_threads operation on top gets real | |
1579 | messy. */ | |
1580 | complete_ongoing_step_over (); | |
1581 | ||
f9e39928 | 1582 | /* Stop all threads before detaching. First, ptrace requires that |
30baf67b | 1583 | the thread is stopped to successfully detach. Second, thread_db |
f9e39928 PA |
1584 | may need to uninstall thread event breakpoints from memory, which |
1585 | only works with a stopped process anyway. */ | |
7984d532 | 1586 | stop_all_lwps (0, NULL); |
f9e39928 | 1587 | |
ca5c370d | 1588 | #ifdef USE_THREAD_DB |
8336d594 | 1589 | thread_db_detach (process); |
ca5c370d PA |
1590 | #endif |
1591 | ||
fa593d66 | 1592 | /* Stabilize threads (move out of jump pads). */ |
5c9eb2f2 | 1593 | target_stabilize_threads (); |
fa593d66 | 1594 | |
ced2dffb PA |
1595 | /* Detach from the clone lwps first. If the thread group exits just |
1596 | while we're detaching, we must reap the clone lwps before we're | |
1597 | able to reap the leader. */ | |
ef2ddb33 | 1598 | for_each_thread (process->pid, linux_detach_lwp_callback); |
ced2dffb | 1599 | |
ef2ddb33 | 1600 | main_lwp = find_lwp_pid (ptid_t (process->pid)); |
ced2dffb | 1601 | linux_detach_one_lwp (main_lwp); |
8336d594 | 1602 | |
8adb37b9 | 1603 | mourn (process); |
f9e39928 PA |
1604 | |
1605 | /* Since we presently can only stop all lwps of all processes, we | |
1606 | need to unstop lwps of other processes. */ | |
7984d532 | 1607 | unstop_all_lwps (0, NULL); |
f9e39928 PA |
1608 | return 0; |
1609 | } | |
1610 | ||
1611 | /* Remove all LWPs that belong to process PROC from the lwp list. */ | |
1612 | ||
8adb37b9 TBA |
1613 | void |
1614 | linux_process_target::mourn (process_info *process) | |
8336d594 PA |
1615 | { |
1616 | struct process_info_private *priv; | |
1617 | ||
1618 | #ifdef USE_THREAD_DB | |
1619 | thread_db_mourn (process); | |
1620 | #endif | |
1621 | ||
6b2a85da SM |
1622 | for_each_thread (process->pid, [] (thread_info *thread) |
1623 | { | |
1624 | delete_lwp (get_thread_lwp (thread)); | |
1625 | }); | |
f9e39928 | 1626 | |
8336d594 | 1627 | /* Freeing all private data. */ |
fe978cb0 | 1628 | priv = process->priv; |
04ec7890 SM |
1629 | if (the_low_target.delete_process != NULL) |
1630 | the_low_target.delete_process (priv->arch_private); | |
1631 | else | |
1632 | gdb_assert (priv->arch_private == NULL); | |
8336d594 | 1633 | free (priv); |
fe978cb0 | 1634 | process->priv = NULL; |
505106cd PA |
1635 | |
1636 | remove_process (process); | |
8336d594 PA |
1637 | } |
1638 | ||
95a49a39 TBA |
1639 | void |
1640 | linux_process_target::join (int pid) | |
444d6139 | 1641 | { |
444d6139 PA |
1642 | int status, ret; |
1643 | ||
1644 | do { | |
d105de22 | 1645 | ret = my_waitpid (pid, &status, 0); |
444d6139 PA |
1646 | if (WIFEXITED (status) || WIFSIGNALED (status)) |
1647 | break; | |
1648 | } while (ret != -1 || errno != ECHILD); | |
1649 | } | |
1650 | ||
13d3d99b TBA |
1651 | /* Return true if the given thread is still alive. */ |
1652 | ||
1653 | bool | |
1654 | linux_process_target::thread_alive (ptid_t ptid) | |
0d62e5e8 | 1655 | { |
95954743 PA |
1656 | struct lwp_info *lwp = find_lwp_pid (ptid); |
1657 | ||
1658 | /* We assume we always know if a thread exits. If a whole process | |
1659 | exited but we still haven't been able to report it to GDB, we'll | |
1660 | hold on to the last lwp of the dead process. */ | |
1661 | if (lwp != NULL) | |
00db26fa | 1662 | return !lwp_is_marked_dead (lwp); |
0d62e5e8 DJ |
1663 | else |
1664 | return 0; | |
1665 | } | |
1666 | ||
df95181f TBA |
1667 | bool |
1668 | linux_process_target::thread_still_has_status_pending (thread_info *thread) | |
582511be PA |
1669 | { |
1670 | struct lwp_info *lp = get_thread_lwp (thread); | |
1671 | ||
1672 | if (!lp->status_pending_p) | |
1673 | return 0; | |
1674 | ||
582511be | 1675 | if (thread->last_resume_kind != resume_stop |
15c66dd6 PA |
1676 | && (lp->stop_reason == TARGET_STOPPED_BY_SW_BREAKPOINT |
1677 | || lp->stop_reason == TARGET_STOPPED_BY_HW_BREAKPOINT)) | |
582511be PA |
1678 | { |
1679 | struct thread_info *saved_thread; | |
1680 | CORE_ADDR pc; | |
1681 | int discard = 0; | |
1682 | ||
1683 | gdb_assert (lp->last_status != 0); | |
1684 | ||
1685 | pc = get_pc (lp); | |
1686 | ||
1687 | saved_thread = current_thread; | |
1688 | current_thread = thread; | |
1689 | ||
1690 | if (pc != lp->stop_pc) | |
1691 | { | |
1692 | if (debug_threads) | |
1693 | debug_printf ("PC of %ld changed\n", | |
1694 | lwpid_of (thread)); | |
1695 | discard = 1; | |
1696 | } | |
3e572f71 PA |
1697 | |
1698 | #if !USE_SIGTRAP_SIGINFO | |
15c66dd6 | 1699 | else if (lp->stop_reason == TARGET_STOPPED_BY_SW_BREAKPOINT |
582511be PA |
1700 | && !(*the_low_target.breakpoint_at) (pc)) |
1701 | { | |
1702 | if (debug_threads) | |
1703 | debug_printf ("previous SW breakpoint of %ld gone\n", | |
1704 | lwpid_of (thread)); | |
1705 | discard = 1; | |
1706 | } | |
15c66dd6 | 1707 | else if (lp->stop_reason == TARGET_STOPPED_BY_HW_BREAKPOINT |
582511be PA |
1708 | && !hardware_breakpoint_inserted_here (pc)) |
1709 | { | |
1710 | if (debug_threads) | |
1711 | debug_printf ("previous HW breakpoint of %ld gone\n", | |
1712 | lwpid_of (thread)); | |
1713 | discard = 1; | |
1714 | } | |
3e572f71 | 1715 | #endif |
582511be PA |
1716 | |
1717 | current_thread = saved_thread; | |
1718 | ||
1719 | if (discard) | |
1720 | { | |
1721 | if (debug_threads) | |
1722 | debug_printf ("discarding pending breakpoint status\n"); | |
1723 | lp->status_pending_p = 0; | |
1724 | return 0; | |
1725 | } | |
1726 | } | |
1727 | ||
1728 | return 1; | |
1729 | } | |
1730 | ||
a681f9c9 PA |
1731 | /* Returns true if LWP is resumed from the client's perspective. */ |
1732 | ||
1733 | static int | |
1734 | lwp_resumed (struct lwp_info *lwp) | |
1735 | { | |
1736 | struct thread_info *thread = get_lwp_thread (lwp); | |
1737 | ||
1738 | if (thread->last_resume_kind != resume_stop) | |
1739 | return 1; | |
1740 | ||
1741 | /* Did gdb send us a `vCont;t', but we haven't reported the | |
1742 | corresponding stop to gdb yet? If so, the thread is still | |
1743 | resumed/running from gdb's perspective. */ | |
1744 | if (thread->last_resume_kind == resume_stop | |
1745 | && thread->last_status.kind == TARGET_WAITKIND_IGNORE) | |
1746 | return 1; | |
1747 | ||
1748 | return 0; | |
1749 | } | |
1750 | ||
df95181f TBA |
1751 | bool |
1752 | linux_process_target::status_pending_p_callback (thread_info *thread, | |
1753 | ptid_t ptid) | |
0d62e5e8 | 1754 | { |
582511be | 1755 | struct lwp_info *lp = get_thread_lwp (thread); |
95954743 PA |
1756 | |
1757 | /* Check if we're only interested in events from a specific process | |
afa8d396 | 1758 | or a specific LWP. */ |
83e1b6c1 | 1759 | if (!thread->id.matches (ptid)) |
95954743 | 1760 | return 0; |
0d62e5e8 | 1761 | |
a681f9c9 PA |
1762 | if (!lwp_resumed (lp)) |
1763 | return 0; | |
1764 | ||
582511be | 1765 | if (lp->status_pending_p |
df95181f | 1766 | && !thread_still_has_status_pending (thread)) |
582511be | 1767 | { |
df95181f | 1768 | resume_one_lwp (lp, lp->stepping, GDB_SIGNAL_0, NULL); |
582511be PA |
1769 | return 0; |
1770 | } | |
0d62e5e8 | 1771 | |
582511be | 1772 | return lp->status_pending_p; |
0d62e5e8 DJ |
1773 | } |
1774 | ||
95954743 PA |
1775 | struct lwp_info * |
1776 | find_lwp_pid (ptid_t ptid) | |
1777 | { | |
da4ae14a | 1778 | thread_info *thread = find_thread ([&] (thread_info *thr_arg) |
454296a2 SM |
1779 | { |
1780 | int lwp = ptid.lwp () != 0 ? ptid.lwp () : ptid.pid (); | |
da4ae14a | 1781 | return thr_arg->id.lwp () == lwp; |
454296a2 | 1782 | }); |
d86d4aaf DE |
1783 | |
1784 | if (thread == NULL) | |
1785 | return NULL; | |
1786 | ||
9c80ecd6 | 1787 | return get_thread_lwp (thread); |
95954743 PA |
1788 | } |
1789 | ||
fa96cb38 | 1790 | /* Return the number of known LWPs in the tgid given by PID. */ |
0d62e5e8 | 1791 | |
fa96cb38 PA |
1792 | static int |
1793 | num_lwps (int pid) | |
1794 | { | |
fa96cb38 | 1795 | int count = 0; |
0d62e5e8 | 1796 | |
4d3bb80e SM |
1797 | for_each_thread (pid, [&] (thread_info *thread) |
1798 | { | |
9c80ecd6 | 1799 | count++; |
4d3bb80e | 1800 | }); |
3aee8918 | 1801 | |
fa96cb38 PA |
1802 | return count; |
1803 | } | |
d61ddec4 | 1804 | |
6d4ee8c6 GB |
1805 | /* See nat/linux-nat.h. */ |
1806 | ||
1807 | struct lwp_info * | |
1808 | iterate_over_lwps (ptid_t filter, | |
d3a70e03 | 1809 | gdb::function_view<iterate_over_lwps_ftype> callback) |
6d4ee8c6 | 1810 | { |
da4ae14a | 1811 | thread_info *thread = find_thread (filter, [&] (thread_info *thr_arg) |
6d1e5673 | 1812 | { |
da4ae14a | 1813 | lwp_info *lwp = get_thread_lwp (thr_arg); |
6d1e5673 | 1814 | |
d3a70e03 | 1815 | return callback (lwp); |
6d1e5673 | 1816 | }); |
6d4ee8c6 | 1817 | |
9c80ecd6 | 1818 | if (thread == NULL) |
6d4ee8c6 GB |
1819 | return NULL; |
1820 | ||
9c80ecd6 | 1821 | return get_thread_lwp (thread); |
6d4ee8c6 GB |
1822 | } |
1823 | ||
fa96cb38 PA |
1824 | /* Detect zombie thread group leaders, and "exit" them. We can't reap |
1825 | their exits until all other threads in the group have exited. */ | |
c3adc08c | 1826 | |
fa96cb38 PA |
1827 | static void |
1828 | check_zombie_leaders (void) | |
1829 | { | |
9179355e SM |
1830 | for_each_process ([] (process_info *proc) { |
1831 | pid_t leader_pid = pid_of (proc); | |
1832 | struct lwp_info *leader_lp; | |
1833 | ||
f2907e49 | 1834 | leader_lp = find_lwp_pid (ptid_t (leader_pid)); |
9179355e SM |
1835 | |
1836 | if (debug_threads) | |
1837 | debug_printf ("leader_pid=%d, leader_lp!=NULL=%d, " | |
1838 | "num_lwps=%d, zombie=%d\n", | |
1839 | leader_pid, leader_lp!= NULL, num_lwps (leader_pid), | |
1840 | linux_proc_pid_is_zombie (leader_pid)); | |
1841 | ||
1842 | if (leader_lp != NULL && !leader_lp->stopped | |
1843 | /* Check if there are other threads in the group, as we may | |
1844 | have raced with the inferior simply exiting. */ | |
1845 | && !last_thread_of_process_p (leader_pid) | |
1846 | && linux_proc_pid_is_zombie (leader_pid)) | |
1847 | { | |
1848 | /* A leader zombie can mean one of two things: | |
1849 | ||
1850 | - It exited, and there's an exit status pending | |
1851 | available, or only the leader exited (not the whole | |
1852 | program). In the latter case, we can't waitpid the | |
1853 | leader's exit status until all other threads are gone. | |
1854 | ||
1855 | - There are 3 or more threads in the group, and a thread | |
1856 | other than the leader exec'd. On an exec, the Linux | |
1857 | kernel destroys all other threads (except the execing | |
1858 | one) in the thread group, and resets the execing thread's | |
1859 | tid to the tgid. No exit notification is sent for the | |
1860 | execing thread -- from the ptracer's perspective, it | |
1861 | appears as though the execing thread just vanishes. | |
1862 | Until we reap all other threads except the leader and the | |
1863 | execing thread, the leader will be zombie, and the | |
1864 | execing thread will be in `D (disc sleep)'. As soon as | |
1865 | all other threads are reaped, the execing thread changes | |
1866 | it's tid to the tgid, and the previous (zombie) leader | |
1867 | vanishes, giving place to the "new" leader. We could try | |
1868 | distinguishing the exit and exec cases, by waiting once | |
1869 | more, and seeing if something comes out, but it doesn't | |
1870 | sound useful. The previous leader _does_ go away, and | |
1871 | we'll re-add the new one once we see the exec event | |
1872 | (which is just the same as what would happen if the | |
1873 | previous leader did exit voluntarily before some other | |
1874 | thread execs). */ | |
1875 | ||
1876 | if (debug_threads) | |
1877 | debug_printf ("CZL: Thread group leader %d zombie " | |
1878 | "(it exited, or another thread execd).\n", | |
1879 | leader_pid); | |
1880 | ||
1881 | delete_lwp (leader_lp); | |
1882 | } | |
1883 | }); | |
fa96cb38 | 1884 | } |
c3adc08c | 1885 | |
a1385b7b SM |
1886 | /* Callback for `find_thread'. Returns the first LWP that is not |
1887 | stopped. */ | |
d50171e4 | 1888 | |
a1385b7b SM |
1889 | static bool |
1890 | not_stopped_callback (thread_info *thread, ptid_t filter) | |
fa96cb38 | 1891 | { |
a1385b7b SM |
1892 | if (!thread->id.matches (filter)) |
1893 | return false; | |
47c0c975 | 1894 | |
a1385b7b | 1895 | lwp_info *lwp = get_thread_lwp (thread); |
fa96cb38 | 1896 | |
a1385b7b | 1897 | return !lwp->stopped; |
0d62e5e8 | 1898 | } |
611cb4a5 | 1899 | |
863d01bd PA |
1900 | /* Increment LWP's suspend count. */ |
1901 | ||
1902 | static void | |
1903 | lwp_suspended_inc (struct lwp_info *lwp) | |
1904 | { | |
1905 | lwp->suspended++; | |
1906 | ||
1907 | if (debug_threads && lwp->suspended > 4) | |
1908 | { | |
1909 | struct thread_info *thread = get_lwp_thread (lwp); | |
1910 | ||
1911 | debug_printf ("LWP %ld has a suspiciously high suspend count," | |
1912 | " suspended=%d\n", lwpid_of (thread), lwp->suspended); | |
1913 | } | |
1914 | } | |
1915 | ||
1916 | /* Decrement LWP's suspend count. */ | |
1917 | ||
1918 | static void | |
1919 | lwp_suspended_decr (struct lwp_info *lwp) | |
1920 | { | |
1921 | lwp->suspended--; | |
1922 | ||
1923 | if (lwp->suspended < 0) | |
1924 | { | |
1925 | struct thread_info *thread = get_lwp_thread (lwp); | |
1926 | ||
1927 | internal_error (__FILE__, __LINE__, | |
1928 | "unsuspend LWP %ld, suspended=%d\n", lwpid_of (thread), | |
1929 | lwp->suspended); | |
1930 | } | |
1931 | } | |
1932 | ||
219f2f23 PA |
1933 | /* This function should only be called if the LWP got a SIGTRAP. |
1934 | ||
1935 | Handle any tracepoint steps or hits. Return true if a tracepoint | |
1936 | event was handled, 0 otherwise. */ | |
1937 | ||
1938 | static int | |
1939 | handle_tracepoints (struct lwp_info *lwp) | |
1940 | { | |
1941 | struct thread_info *tinfo = get_lwp_thread (lwp); | |
1942 | int tpoint_related_event = 0; | |
1943 | ||
582511be PA |
1944 | gdb_assert (lwp->suspended == 0); |
1945 | ||
7984d532 PA |
1946 | /* If this tracepoint hit causes a tracing stop, we'll immediately |
1947 | uninsert tracepoints. To do this, we temporarily pause all | |
1948 | threads, unpatch away, and then unpause threads. We need to make | |
1949 | sure the unpausing doesn't resume LWP too. */ | |
863d01bd | 1950 | lwp_suspended_inc (lwp); |
7984d532 | 1951 | |
219f2f23 PA |
1952 | /* And we need to be sure that any all-threads-stopping doesn't try |
1953 | to move threads out of the jump pads, as it could deadlock the | |
1954 | inferior (LWP could be in the jump pad, maybe even holding the | |
1955 | lock.) */ | |
1956 | ||
1957 | /* Do any necessary step collect actions. */ | |
1958 | tpoint_related_event |= tracepoint_finished_step (tinfo, lwp->stop_pc); | |
1959 | ||
fa593d66 PA |
1960 | tpoint_related_event |= handle_tracepoint_bkpts (tinfo, lwp->stop_pc); |
1961 | ||
219f2f23 PA |
1962 | /* See if we just hit a tracepoint and do its main collect |
1963 | actions. */ | |
1964 | tpoint_related_event |= tracepoint_was_hit (tinfo, lwp->stop_pc); | |
1965 | ||
863d01bd | 1966 | lwp_suspended_decr (lwp); |
7984d532 PA |
1967 | |
1968 | gdb_assert (lwp->suspended == 0); | |
229d26fc SM |
1969 | gdb_assert (!stabilizing_threads |
1970 | || (lwp->collecting_fast_tracepoint | |
1971 | != fast_tpoint_collect_result::not_collecting)); | |
7984d532 | 1972 | |
219f2f23 PA |
1973 | if (tpoint_related_event) |
1974 | { | |
1975 | if (debug_threads) | |
87ce2a04 | 1976 | debug_printf ("got a tracepoint event\n"); |
219f2f23 PA |
1977 | return 1; |
1978 | } | |
1979 | ||
1980 | return 0; | |
1981 | } | |
1982 | ||
229d26fc SM |
1983 | /* Convenience wrapper. Returns information about LWP's fast tracepoint |
1984 | collection status. */ | |
fa593d66 | 1985 | |
229d26fc | 1986 | static fast_tpoint_collect_result |
fa593d66 PA |
1987 | linux_fast_tracepoint_collecting (struct lwp_info *lwp, |
1988 | struct fast_tpoint_collect_status *status) | |
1989 | { | |
1990 | CORE_ADDR thread_area; | |
d86d4aaf | 1991 | struct thread_info *thread = get_lwp_thread (lwp); |
fa593d66 PA |
1992 | |
1993 | if (the_low_target.get_thread_area == NULL) | |
229d26fc | 1994 | return fast_tpoint_collect_result::not_collecting; |
fa593d66 PA |
1995 | |
1996 | /* Get the thread area address. This is used to recognize which | |
1997 | thread is which when tracing with the in-process agent library. | |
1998 | We don't read anything from the address, and treat it as opaque; | |
1999 | it's the address itself that we assume is unique per-thread. */ | |
d86d4aaf | 2000 | if ((*the_low_target.get_thread_area) (lwpid_of (thread), &thread_area) == -1) |
229d26fc | 2001 | return fast_tpoint_collect_result::not_collecting; |
fa593d66 PA |
2002 | |
2003 | return fast_tracepoint_collecting (thread_area, lwp->stop_pc, status); | |
2004 | } | |
2005 | ||
d16f3f6c TBA |
2006 | bool |
2007 | linux_process_target::maybe_move_out_of_jump_pad (lwp_info *lwp, int *wstat) | |
fa593d66 | 2008 | { |
0bfdf32f | 2009 | struct thread_info *saved_thread; |
fa593d66 | 2010 | |
0bfdf32f GB |
2011 | saved_thread = current_thread; |
2012 | current_thread = get_lwp_thread (lwp); | |
fa593d66 PA |
2013 | |
2014 | if ((wstat == NULL | |
2015 | || (WIFSTOPPED (*wstat) && WSTOPSIG (*wstat) != SIGTRAP)) | |
2016 | && supports_fast_tracepoints () | |
58b4daa5 | 2017 | && agent_loaded_p ()) |
fa593d66 PA |
2018 | { |
2019 | struct fast_tpoint_collect_status status; | |
fa593d66 PA |
2020 | |
2021 | if (debug_threads) | |
87ce2a04 DE |
2022 | debug_printf ("Checking whether LWP %ld needs to move out of the " |
2023 | "jump pad.\n", | |
0bfdf32f | 2024 | lwpid_of (current_thread)); |
fa593d66 | 2025 | |
229d26fc SM |
2026 | fast_tpoint_collect_result r |
2027 | = linux_fast_tracepoint_collecting (lwp, &status); | |
fa593d66 PA |
2028 | |
2029 | if (wstat == NULL | |
2030 | || (WSTOPSIG (*wstat) != SIGILL | |
2031 | && WSTOPSIG (*wstat) != SIGFPE | |
2032 | && WSTOPSIG (*wstat) != SIGSEGV | |
2033 | && WSTOPSIG (*wstat) != SIGBUS)) | |
2034 | { | |
2035 | lwp->collecting_fast_tracepoint = r; | |
2036 | ||
229d26fc | 2037 | if (r != fast_tpoint_collect_result::not_collecting) |
fa593d66 | 2038 | { |
229d26fc SM |
2039 | if (r == fast_tpoint_collect_result::before_insn |
2040 | && lwp->exit_jump_pad_bkpt == NULL) | |
fa593d66 PA |
2041 | { |
2042 | /* Haven't executed the original instruction yet. | |
2043 | Set breakpoint there, and wait till it's hit, | |
2044 | then single-step until exiting the jump pad. */ | |
2045 | lwp->exit_jump_pad_bkpt | |
2046 | = set_breakpoint_at (status.adjusted_insn_addr, NULL); | |
2047 | } | |
2048 | ||
2049 | if (debug_threads) | |
87ce2a04 DE |
2050 | debug_printf ("Checking whether LWP %ld needs to move out of " |
2051 | "the jump pad...it does\n", | |
0bfdf32f GB |
2052 | lwpid_of (current_thread)); |
2053 | current_thread = saved_thread; | |
fa593d66 | 2054 | |
d16f3f6c | 2055 | return true; |
fa593d66 PA |
2056 | } |
2057 | } | |
2058 | else | |
2059 | { | |
2060 | /* If we get a synchronous signal while collecting, *and* | |
2061 | while executing the (relocated) original instruction, | |
2062 | reset the PC to point at the tpoint address, before | |
2063 | reporting to GDB. Otherwise, it's an IPA lib bug: just | |
2064 | report the signal to GDB, and pray for the best. */ | |
2065 | ||
229d26fc SM |
2066 | lwp->collecting_fast_tracepoint |
2067 | = fast_tpoint_collect_result::not_collecting; | |
fa593d66 | 2068 | |
229d26fc | 2069 | if (r != fast_tpoint_collect_result::not_collecting |
fa593d66 PA |
2070 | && (status.adjusted_insn_addr <= lwp->stop_pc |
2071 | && lwp->stop_pc < status.adjusted_insn_addr_end)) | |
2072 | { | |
2073 | siginfo_t info; | |
2074 | struct regcache *regcache; | |
2075 | ||
2076 | /* The si_addr on a few signals references the address | |
2077 | of the faulting instruction. Adjust that as | |
2078 | well. */ | |
2079 | if ((WSTOPSIG (*wstat) == SIGILL | |
2080 | || WSTOPSIG (*wstat) == SIGFPE | |
2081 | || WSTOPSIG (*wstat) == SIGBUS | |
2082 | || WSTOPSIG (*wstat) == SIGSEGV) | |
0bfdf32f | 2083 | && ptrace (PTRACE_GETSIGINFO, lwpid_of (current_thread), |
b8e1b30e | 2084 | (PTRACE_TYPE_ARG3) 0, &info) == 0 |
fa593d66 PA |
2085 | /* Final check just to make sure we don't clobber |
2086 | the siginfo of non-kernel-sent signals. */ | |
2087 | && (uintptr_t) info.si_addr == lwp->stop_pc) | |
2088 | { | |
2089 | info.si_addr = (void *) (uintptr_t) status.tpoint_addr; | |
0bfdf32f | 2090 | ptrace (PTRACE_SETSIGINFO, lwpid_of (current_thread), |
b8e1b30e | 2091 | (PTRACE_TYPE_ARG3) 0, &info); |
fa593d66 PA |
2092 | } |
2093 | ||
0bfdf32f | 2094 | regcache = get_thread_regcache (current_thread, 1); |
fa593d66 PA |
2095 | (*the_low_target.set_pc) (regcache, status.tpoint_addr); |
2096 | lwp->stop_pc = status.tpoint_addr; | |
2097 | ||
2098 | /* Cancel any fast tracepoint lock this thread was | |
2099 | holding. */ | |
2100 | force_unlock_trace_buffer (); | |
2101 | } | |
2102 | ||
2103 | if (lwp->exit_jump_pad_bkpt != NULL) | |
2104 | { | |
2105 | if (debug_threads) | |
87ce2a04 DE |
2106 | debug_printf ("Cancelling fast exit-jump-pad: removing bkpt. " |
2107 | "stopping all threads momentarily.\n"); | |
fa593d66 PA |
2108 | |
2109 | stop_all_lwps (1, lwp); | |
fa593d66 PA |
2110 | |
2111 | delete_breakpoint (lwp->exit_jump_pad_bkpt); | |
2112 | lwp->exit_jump_pad_bkpt = NULL; | |
2113 | ||
2114 | unstop_all_lwps (1, lwp); | |
2115 | ||
2116 | gdb_assert (lwp->suspended >= 0); | |
2117 | } | |
2118 | } | |
2119 | } | |
2120 | ||
2121 | if (debug_threads) | |
87ce2a04 DE |
2122 | debug_printf ("Checking whether LWP %ld needs to move out of the " |
2123 | "jump pad...no\n", | |
0bfdf32f | 2124 | lwpid_of (current_thread)); |
0cccb683 | 2125 | |
0bfdf32f | 2126 | current_thread = saved_thread; |
d16f3f6c | 2127 | return false; |
fa593d66 PA |
2128 | } |
2129 | ||
2130 | /* Enqueue one signal in the "signals to report later when out of the | |
2131 | jump pad" list. */ | |
2132 | ||
2133 | static void | |
2134 | enqueue_one_deferred_signal (struct lwp_info *lwp, int *wstat) | |
2135 | { | |
2136 | struct pending_signals *p_sig; | |
d86d4aaf | 2137 | struct thread_info *thread = get_lwp_thread (lwp); |
fa593d66 PA |
2138 | |
2139 | if (debug_threads) | |
87ce2a04 | 2140 | debug_printf ("Deferring signal %d for LWP %ld.\n", |
d86d4aaf | 2141 | WSTOPSIG (*wstat), lwpid_of (thread)); |
fa593d66 PA |
2142 | |
2143 | if (debug_threads) | |
2144 | { | |
2145 | struct pending_signals *sig; | |
2146 | ||
2147 | for (sig = lwp->pending_signals_to_report; | |
2148 | sig != NULL; | |
2149 | sig = sig->prev) | |
87ce2a04 DE |
2150 | debug_printf (" Already queued %d\n", |
2151 | sig->signal); | |
fa593d66 | 2152 | |
87ce2a04 | 2153 | debug_printf (" (no more currently queued signals)\n"); |
fa593d66 PA |
2154 | } |
2155 | ||
1a981360 PA |
2156 | /* Don't enqueue non-RT signals if they are already in the deferred |
2157 | queue. (SIGSTOP being the easiest signal to see ending up here | |
2158 | twice) */ | |
2159 | if (WSTOPSIG (*wstat) < __SIGRTMIN) | |
2160 | { | |
2161 | struct pending_signals *sig; | |
2162 | ||
2163 | for (sig = lwp->pending_signals_to_report; | |
2164 | sig != NULL; | |
2165 | sig = sig->prev) | |
2166 | { | |
2167 | if (sig->signal == WSTOPSIG (*wstat)) | |
2168 | { | |
2169 | if (debug_threads) | |
87ce2a04 DE |
2170 | debug_printf ("Not requeuing already queued non-RT signal %d" |
2171 | " for LWP %ld\n", | |
2172 | sig->signal, | |
d86d4aaf | 2173 | lwpid_of (thread)); |
1a981360 PA |
2174 | return; |
2175 | } | |
2176 | } | |
2177 | } | |
2178 | ||
8d749320 | 2179 | p_sig = XCNEW (struct pending_signals); |
fa593d66 PA |
2180 | p_sig->prev = lwp->pending_signals_to_report; |
2181 | p_sig->signal = WSTOPSIG (*wstat); | |
8d749320 | 2182 | |
d86d4aaf | 2183 | ptrace (PTRACE_GETSIGINFO, lwpid_of (thread), (PTRACE_TYPE_ARG3) 0, |
56f7af9c | 2184 | &p_sig->info); |
fa593d66 PA |
2185 | |
2186 | lwp->pending_signals_to_report = p_sig; | |
2187 | } | |
2188 | ||
2189 | /* Dequeue one signal from the "signals to report later when out of | |
2190 | the jump pad" list. */ | |
2191 | ||
2192 | static int | |
2193 | dequeue_one_deferred_signal (struct lwp_info *lwp, int *wstat) | |
2194 | { | |
d86d4aaf DE |
2195 | struct thread_info *thread = get_lwp_thread (lwp); |
2196 | ||
fa593d66 PA |
2197 | if (lwp->pending_signals_to_report != NULL) |
2198 | { | |
2199 | struct pending_signals **p_sig; | |
2200 | ||
2201 | p_sig = &lwp->pending_signals_to_report; | |
2202 | while ((*p_sig)->prev != NULL) | |
2203 | p_sig = &(*p_sig)->prev; | |
2204 | ||
2205 | *wstat = W_STOPCODE ((*p_sig)->signal); | |
2206 | if ((*p_sig)->info.si_signo != 0) | |
d86d4aaf | 2207 | ptrace (PTRACE_SETSIGINFO, lwpid_of (thread), (PTRACE_TYPE_ARG3) 0, |
56f7af9c | 2208 | &(*p_sig)->info); |
fa593d66 PA |
2209 | free (*p_sig); |
2210 | *p_sig = NULL; | |
2211 | ||
2212 | if (debug_threads) | |
87ce2a04 | 2213 | debug_printf ("Reporting deferred signal %d for LWP %ld.\n", |
d86d4aaf | 2214 | WSTOPSIG (*wstat), lwpid_of (thread)); |
fa593d66 PA |
2215 | |
2216 | if (debug_threads) | |
2217 | { | |
2218 | struct pending_signals *sig; | |
2219 | ||
2220 | for (sig = lwp->pending_signals_to_report; | |
2221 | sig != NULL; | |
2222 | sig = sig->prev) | |
87ce2a04 DE |
2223 | debug_printf (" Still queued %d\n", |
2224 | sig->signal); | |
fa593d66 | 2225 | |
87ce2a04 | 2226 | debug_printf (" (no more queued signals)\n"); |
fa593d66 PA |
2227 | } |
2228 | ||
2229 | return 1; | |
2230 | } | |
2231 | ||
2232 | return 0; | |
2233 | } | |
2234 | ||
582511be PA |
2235 | /* Fetch the possibly triggered data watchpoint info and store it in |
2236 | CHILD. | |
d50171e4 | 2237 | |
582511be PA |
2238 | On some archs, like x86, that use debug registers to set |
2239 | watchpoints, it's possible that the way to know which watched | |
2240 | address trapped, is to check the register that is used to select | |
2241 | which address to watch. Problem is, between setting the watchpoint | |
2242 | and reading back which data address trapped, the user may change | |
2243 | the set of watchpoints, and, as a consequence, GDB changes the | |
2244 | debug registers in the inferior. To avoid reading back a stale | |
2245 | stopped-data-address when that happens, we cache in LP the fact | |
2246 | that a watchpoint trapped, and the corresponding data address, as | |
2247 | soon as we see CHILD stop with a SIGTRAP. If GDB changes the debug | |
2248 | registers meanwhile, we have the cached data we can rely on. */ | |
d50171e4 | 2249 | |
582511be PA |
2250 | static int |
2251 | check_stopped_by_watchpoint (struct lwp_info *child) | |
2252 | { | |
2253 | if (the_low_target.stopped_by_watchpoint != NULL) | |
d50171e4 | 2254 | { |
582511be | 2255 | struct thread_info *saved_thread; |
d50171e4 | 2256 | |
582511be PA |
2257 | saved_thread = current_thread; |
2258 | current_thread = get_lwp_thread (child); | |
2259 | ||
2260 | if (the_low_target.stopped_by_watchpoint ()) | |
d50171e4 | 2261 | { |
15c66dd6 | 2262 | child->stop_reason = TARGET_STOPPED_BY_WATCHPOINT; |
582511be PA |
2263 | |
2264 | if (the_low_target.stopped_data_address != NULL) | |
2265 | child->stopped_data_address | |
2266 | = the_low_target.stopped_data_address (); | |
2267 | else | |
2268 | child->stopped_data_address = 0; | |
d50171e4 PA |
2269 | } |
2270 | ||
0bfdf32f | 2271 | current_thread = saved_thread; |
d50171e4 PA |
2272 | } |
2273 | ||
15c66dd6 | 2274 | return child->stop_reason == TARGET_STOPPED_BY_WATCHPOINT; |
c4d9ceb6 YQ |
2275 | } |
2276 | ||
de0d863e DB |
2277 | /* Return the ptrace options that we want to try to enable. */ |
2278 | ||
2279 | static int | |
2280 | linux_low_ptrace_options (int attached) | |
2281 | { | |
c12a5089 | 2282 | client_state &cs = get_client_state (); |
de0d863e DB |
2283 | int options = 0; |
2284 | ||
2285 | if (!attached) | |
2286 | options |= PTRACE_O_EXITKILL; | |
2287 | ||
c12a5089 | 2288 | if (cs.report_fork_events) |
de0d863e DB |
2289 | options |= PTRACE_O_TRACEFORK; |
2290 | ||
c12a5089 | 2291 | if (cs.report_vfork_events) |
c269dbdb DB |
2292 | options |= (PTRACE_O_TRACEVFORK | PTRACE_O_TRACEVFORKDONE); |
2293 | ||
c12a5089 | 2294 | if (cs.report_exec_events) |
94585166 DB |
2295 | options |= PTRACE_O_TRACEEXEC; |
2296 | ||
82075af2 JS |
2297 | options |= PTRACE_O_TRACESYSGOOD; |
2298 | ||
de0d863e DB |
2299 | return options; |
2300 | } | |
2301 | ||
d16f3f6c TBA |
2302 | lwp_info * |
2303 | linux_process_target::filter_event (int lwpid, int wstat) | |
fa96cb38 | 2304 | { |
c12a5089 | 2305 | client_state &cs = get_client_state (); |
fa96cb38 PA |
2306 | struct lwp_info *child; |
2307 | struct thread_info *thread; | |
582511be | 2308 | int have_stop_pc = 0; |
fa96cb38 | 2309 | |
f2907e49 | 2310 | child = find_lwp_pid (ptid_t (lwpid)); |
fa96cb38 | 2311 | |
94585166 DB |
2312 | /* Check for stop events reported by a process we didn't already |
2313 | know about - anything not already in our LWP list. | |
2314 | ||
2315 | If we're expecting to receive stopped processes after | |
2316 | fork, vfork, and clone events, then we'll just add the | |
2317 | new one to our list and go back to waiting for the event | |
2318 | to be reported - the stopped process might be returned | |
2319 | from waitpid before or after the event is. | |
2320 | ||
2321 | But note the case of a non-leader thread exec'ing after the | |
2322 | leader having exited, and gone from our lists (because | |
2323 | check_zombie_leaders deleted it). The non-leader thread | |
2324 | changes its tid to the tgid. */ | |
2325 | ||
2326 | if (WIFSTOPPED (wstat) && child == NULL && WSTOPSIG (wstat) == SIGTRAP | |
2327 | && linux_ptrace_get_extended_event (wstat) == PTRACE_EVENT_EXEC) | |
2328 | { | |
2329 | ptid_t child_ptid; | |
2330 | ||
2331 | /* A multi-thread exec after we had seen the leader exiting. */ | |
2332 | if (debug_threads) | |
2333 | { | |
2334 | debug_printf ("LLW: Re-adding thread group leader LWP %d" | |
2335 | "after exec.\n", lwpid); | |
2336 | } | |
2337 | ||
fd79271b | 2338 | child_ptid = ptid_t (lwpid, lwpid, 0); |
94585166 DB |
2339 | child = add_lwp (child_ptid); |
2340 | child->stopped = 1; | |
2341 | current_thread = child->thread; | |
2342 | } | |
2343 | ||
fa96cb38 PA |
2344 | /* If we didn't find a process, one of two things presumably happened: |
2345 | - A process we started and then detached from has exited. Ignore it. | |
2346 | - A process we are controlling has forked and the new child's stop | |
2347 | was reported to us by the kernel. Save its PID. */ | |
2348 | if (child == NULL && WIFSTOPPED (wstat)) | |
2349 | { | |
2350 | add_to_pid_list (&stopped_pids, lwpid, wstat); | |
2351 | return NULL; | |
2352 | } | |
2353 | else if (child == NULL) | |
2354 | return NULL; | |
2355 | ||
2356 | thread = get_lwp_thread (child); | |
2357 | ||
2358 | child->stopped = 1; | |
2359 | ||
2360 | child->last_status = wstat; | |
2361 | ||
582511be PA |
2362 | /* Check if the thread has exited. */ |
2363 | if ((WIFEXITED (wstat) || WIFSIGNALED (wstat))) | |
2364 | { | |
2365 | if (debug_threads) | |
2366 | debug_printf ("LLFE: %d exited.\n", lwpid); | |
f50bf8e5 YQ |
2367 | |
2368 | if (finish_step_over (child)) | |
2369 | { | |
2370 | /* Unsuspend all other LWPs, and set them back running again. */ | |
2371 | unsuspend_all_lwps (child); | |
2372 | } | |
2373 | ||
65706a29 PA |
2374 | /* If there is at least one more LWP, then the exit signal was |
2375 | not the end of the debugged application and should be | |
2376 | ignored, unless GDB wants to hear about thread exits. */ | |
c12a5089 | 2377 | if (cs.report_thread_events |
65706a29 | 2378 | || last_thread_of_process_p (pid_of (thread))) |
582511be | 2379 | { |
65706a29 PA |
2380 | /* Since events are serialized to GDB core, and we can't |
2381 | report this one right now. Leave the status pending for | |
2382 | the next time we're able to report it. */ | |
2383 | mark_lwp_dead (child, wstat); | |
2384 | return child; | |
582511be PA |
2385 | } |
2386 | else | |
2387 | { | |
65706a29 PA |
2388 | delete_lwp (child); |
2389 | return NULL; | |
582511be PA |
2390 | } |
2391 | } | |
2392 | ||
2393 | gdb_assert (WIFSTOPPED (wstat)); | |
2394 | ||
fa96cb38 PA |
2395 | if (WIFSTOPPED (wstat)) |
2396 | { | |
2397 | struct process_info *proc; | |
2398 | ||
c06cbd92 | 2399 | /* Architecture-specific setup after inferior is running. */ |
fa96cb38 | 2400 | proc = find_process_pid (pid_of (thread)); |
c06cbd92 | 2401 | if (proc->tdesc == NULL) |
fa96cb38 | 2402 | { |
c06cbd92 YQ |
2403 | if (proc->attached) |
2404 | { | |
c06cbd92 YQ |
2405 | /* This needs to happen after we have attached to the |
2406 | inferior and it is stopped for the first time, but | |
2407 | before we access any inferior registers. */ | |
797bcff5 | 2408 | arch_setup_thread (thread); |
c06cbd92 YQ |
2409 | } |
2410 | else | |
2411 | { | |
2412 | /* The process is started, but GDBserver will do | |
2413 | architecture-specific setup after the program stops at | |
2414 | the first instruction. */ | |
2415 | child->status_pending_p = 1; | |
2416 | child->status_pending = wstat; | |
2417 | return child; | |
2418 | } | |
fa96cb38 PA |
2419 | } |
2420 | } | |
2421 | ||
fa96cb38 PA |
2422 | if (WIFSTOPPED (wstat) && child->must_set_ptrace_flags) |
2423 | { | |
beed38b8 | 2424 | struct process_info *proc = find_process_pid (pid_of (thread)); |
de0d863e | 2425 | int options = linux_low_ptrace_options (proc->attached); |
beed38b8 | 2426 | |
de0d863e | 2427 | linux_enable_event_reporting (lwpid, options); |
fa96cb38 PA |
2428 | child->must_set_ptrace_flags = 0; |
2429 | } | |
2430 | ||
82075af2 JS |
2431 | /* Always update syscall_state, even if it will be filtered later. */ |
2432 | if (WIFSTOPPED (wstat) && WSTOPSIG (wstat) == SYSCALL_SIGTRAP) | |
2433 | { | |
2434 | child->syscall_state | |
2435 | = (child->syscall_state == TARGET_WAITKIND_SYSCALL_ENTRY | |
2436 | ? TARGET_WAITKIND_SYSCALL_RETURN | |
2437 | : TARGET_WAITKIND_SYSCALL_ENTRY); | |
2438 | } | |
2439 | else | |
2440 | { | |
2441 | /* Almost all other ptrace-stops are known to be outside of system | |
2442 | calls, with further exceptions in handle_extended_wait. */ | |
2443 | child->syscall_state = TARGET_WAITKIND_IGNORE; | |
2444 | } | |
2445 | ||
e7ad2f14 PA |
2446 | /* Be careful to not overwrite stop_pc until save_stop_reason is |
2447 | called. */ | |
fa96cb38 | 2448 | if (WIFSTOPPED (wstat) && WSTOPSIG (wstat) == SIGTRAP |
89a5711c | 2449 | && linux_is_extended_waitstatus (wstat)) |
fa96cb38 | 2450 | { |
582511be | 2451 | child->stop_pc = get_pc (child); |
94585166 | 2452 | if (handle_extended_wait (&child, wstat)) |
de0d863e DB |
2453 | { |
2454 | /* The event has been handled, so just return without | |
2455 | reporting it. */ | |
2456 | return NULL; | |
2457 | } | |
fa96cb38 PA |
2458 | } |
2459 | ||
80aea927 | 2460 | if (linux_wstatus_maybe_breakpoint (wstat)) |
582511be | 2461 | { |
e7ad2f14 | 2462 | if (save_stop_reason (child)) |
582511be PA |
2463 | have_stop_pc = 1; |
2464 | } | |
2465 | ||
2466 | if (!have_stop_pc) | |
2467 | child->stop_pc = get_pc (child); | |
2468 | ||
fa96cb38 PA |
2469 | if (WIFSTOPPED (wstat) && WSTOPSIG (wstat) == SIGSTOP |
2470 | && child->stop_expected) | |
2471 | { | |
2472 | if (debug_threads) | |
2473 | debug_printf ("Expected stop.\n"); | |
2474 | child->stop_expected = 0; | |
2475 | ||
2476 | if (thread->last_resume_kind == resume_stop) | |
2477 | { | |
2478 | /* We want to report the stop to the core. Treat the | |
2479 | SIGSTOP as a normal event. */ | |
2bf6fb9d PA |
2480 | if (debug_threads) |
2481 | debug_printf ("LLW: resume_stop SIGSTOP caught for %s.\n", | |
2482 | target_pid_to_str (ptid_of (thread))); | |
fa96cb38 PA |
2483 | } |
2484 | else if (stopping_threads != NOT_STOPPING_THREADS) | |
2485 | { | |
2486 | /* Stopping threads. We don't want this SIGSTOP to end up | |
582511be | 2487 | pending. */ |
2bf6fb9d PA |
2488 | if (debug_threads) |
2489 | debug_printf ("LLW: SIGSTOP caught for %s " | |
2490 | "while stopping threads.\n", | |
2491 | target_pid_to_str (ptid_of (thread))); | |
fa96cb38 PA |
2492 | return NULL; |
2493 | } | |
2494 | else | |
2495 | { | |
2bf6fb9d PA |
2496 | /* This is a delayed SIGSTOP. Filter out the event. */ |
2497 | if (debug_threads) | |
2498 | debug_printf ("LLW: %s %s, 0, 0 (discard delayed SIGSTOP)\n", | |
2499 | child->stepping ? "step" : "continue", | |
2500 | target_pid_to_str (ptid_of (thread))); | |
2501 | ||
df95181f | 2502 | resume_one_lwp (child, child->stepping, 0, NULL); |
fa96cb38 PA |
2503 | return NULL; |
2504 | } | |
2505 | } | |
2506 | ||
582511be PA |
2507 | child->status_pending_p = 1; |
2508 | child->status_pending = wstat; | |
fa96cb38 PA |
2509 | return child; |
2510 | } | |
2511 | ||
f79b145d YQ |
2512 | /* Return true if THREAD is doing hardware single step. */ |
2513 | ||
2514 | static int | |
2515 | maybe_hw_step (struct thread_info *thread) | |
2516 | { | |
2517 | if (can_hardware_single_step ()) | |
2518 | return 1; | |
2519 | else | |
2520 | { | |
3b9a79ef | 2521 | /* GDBserver must insert single-step breakpoint for software |
f79b145d | 2522 | single step. */ |
3b9a79ef | 2523 | gdb_assert (has_single_step_breakpoints (thread)); |
f79b145d YQ |
2524 | return 0; |
2525 | } | |
2526 | } | |
2527 | ||
df95181f TBA |
2528 | void |
2529 | linux_process_target::resume_stopped_resumed_lwps (thread_info *thread) | |
20ba1ce6 | 2530 | { |
20ba1ce6 PA |
2531 | struct lwp_info *lp = get_thread_lwp (thread); |
2532 | ||
2533 | if (lp->stopped | |
863d01bd | 2534 | && !lp->suspended |
20ba1ce6 | 2535 | && !lp->status_pending_p |
20ba1ce6 PA |
2536 | && thread->last_status.kind == TARGET_WAITKIND_IGNORE) |
2537 | { | |
8901d193 YQ |
2538 | int step = 0; |
2539 | ||
2540 | if (thread->last_resume_kind == resume_step) | |
2541 | step = maybe_hw_step (thread); | |
20ba1ce6 PA |
2542 | |
2543 | if (debug_threads) | |
2544 | debug_printf ("RSRL: resuming stopped-resumed LWP %s at %s: step=%d\n", | |
2545 | target_pid_to_str (ptid_of (thread)), | |
2546 | paddress (lp->stop_pc), | |
2547 | step); | |
2548 | ||
df95181f | 2549 | resume_one_lwp (lp, step, GDB_SIGNAL_0, NULL); |
20ba1ce6 PA |
2550 | } |
2551 | } | |
2552 | ||
d16f3f6c TBA |
2553 | int |
2554 | linux_process_target::wait_for_event_filtered (ptid_t wait_ptid, | |
2555 | ptid_t filter_ptid, | |
2556 | int *wstatp, int options) | |
0d62e5e8 | 2557 | { |
d86d4aaf | 2558 | struct thread_info *event_thread; |
d50171e4 | 2559 | struct lwp_info *event_child, *requested_child; |
fa96cb38 | 2560 | sigset_t block_mask, prev_mask; |
d50171e4 | 2561 | |
fa96cb38 | 2562 | retry: |
d86d4aaf DE |
2563 | /* N.B. event_thread points to the thread_info struct that contains |
2564 | event_child. Keep them in sync. */ | |
2565 | event_thread = NULL; | |
d50171e4 PA |
2566 | event_child = NULL; |
2567 | requested_child = NULL; | |
0d62e5e8 | 2568 | |
95954743 | 2569 | /* Check for a lwp with a pending status. */ |
bd99dc85 | 2570 | |
d7e15655 | 2571 | if (filter_ptid == minus_one_ptid || filter_ptid.is_pid ()) |
0d62e5e8 | 2572 | { |
83e1b6c1 SM |
2573 | event_thread = find_thread_in_random ([&] (thread_info *thread) |
2574 | { | |
2575 | return status_pending_p_callback (thread, filter_ptid); | |
2576 | }); | |
2577 | ||
d86d4aaf DE |
2578 | if (event_thread != NULL) |
2579 | event_child = get_thread_lwp (event_thread); | |
2580 | if (debug_threads && event_thread) | |
2581 | debug_printf ("Got a pending child %ld\n", lwpid_of (event_thread)); | |
0d62e5e8 | 2582 | } |
d7e15655 | 2583 | else if (filter_ptid != null_ptid) |
0d62e5e8 | 2584 | { |
fa96cb38 | 2585 | requested_child = find_lwp_pid (filter_ptid); |
d50171e4 | 2586 | |
bde24c0a | 2587 | if (stopping_threads == NOT_STOPPING_THREADS |
fa593d66 | 2588 | && requested_child->status_pending_p |
229d26fc SM |
2589 | && (requested_child->collecting_fast_tracepoint |
2590 | != fast_tpoint_collect_result::not_collecting)) | |
fa593d66 PA |
2591 | { |
2592 | enqueue_one_deferred_signal (requested_child, | |
2593 | &requested_child->status_pending); | |
2594 | requested_child->status_pending_p = 0; | |
2595 | requested_child->status_pending = 0; | |
df95181f | 2596 | resume_one_lwp (requested_child, 0, 0, NULL); |
fa593d66 PA |
2597 | } |
2598 | ||
2599 | if (requested_child->suspended | |
2600 | && requested_child->status_pending_p) | |
38e08fca GB |
2601 | { |
2602 | internal_error (__FILE__, __LINE__, | |
2603 | "requesting an event out of a" | |
2604 | " suspended child?"); | |
2605 | } | |
fa593d66 | 2606 | |
d50171e4 | 2607 | if (requested_child->status_pending_p) |
d86d4aaf DE |
2608 | { |
2609 | event_child = requested_child; | |
2610 | event_thread = get_lwp_thread (event_child); | |
2611 | } | |
0d62e5e8 | 2612 | } |
611cb4a5 | 2613 | |
0d62e5e8 DJ |
2614 | if (event_child != NULL) |
2615 | { | |
bd99dc85 | 2616 | if (debug_threads) |
87ce2a04 | 2617 | debug_printf ("Got an event from pending child %ld (%04x)\n", |
d86d4aaf | 2618 | lwpid_of (event_thread), event_child->status_pending); |
fa96cb38 | 2619 | *wstatp = event_child->status_pending; |
bd99dc85 PA |
2620 | event_child->status_pending_p = 0; |
2621 | event_child->status_pending = 0; | |
0bfdf32f | 2622 | current_thread = event_thread; |
d86d4aaf | 2623 | return lwpid_of (event_thread); |
0d62e5e8 DJ |
2624 | } |
2625 | ||
fa96cb38 PA |
2626 | /* But if we don't find a pending event, we'll have to wait. |
2627 | ||
2628 | We only enter this loop if no process has a pending wait status. | |
2629 | Thus any action taken in response to a wait status inside this | |
2630 | loop is responding as soon as we detect the status, not after any | |
2631 | pending events. */ | |
d8301ad1 | 2632 | |
fa96cb38 PA |
2633 | /* Make sure SIGCHLD is blocked until the sigsuspend below. Block |
2634 | all signals while here. */ | |
2635 | sigfillset (&block_mask); | |
21987b9c | 2636 | gdb_sigmask (SIG_BLOCK, &block_mask, &prev_mask); |
fa96cb38 | 2637 | |
582511be PA |
2638 | /* Always pull all events out of the kernel. We'll randomly select |
2639 | an event LWP out of all that have events, to prevent | |
2640 | starvation. */ | |
fa96cb38 | 2641 | while (event_child == NULL) |
0d62e5e8 | 2642 | { |
fa96cb38 | 2643 | pid_t ret = 0; |
0d62e5e8 | 2644 | |
fa96cb38 PA |
2645 | /* Always use -1 and WNOHANG, due to couple of a kernel/ptrace |
2646 | quirks: | |
0d62e5e8 | 2647 | |
fa96cb38 PA |
2648 | - If the thread group leader exits while other threads in the |
2649 | thread group still exist, waitpid(TGID, ...) hangs. That | |
2650 | waitpid won't return an exit status until the other threads | |
2651 | in the group are reaped. | |
611cb4a5 | 2652 | |
fa96cb38 PA |
2653 | - When a non-leader thread execs, that thread just vanishes |
2654 | without reporting an exit (so we'd hang if we waited for it | |
2655 | explicitly in that case). The exec event is reported to | |
94585166 | 2656 | the TGID pid. */ |
fa96cb38 PA |
2657 | errno = 0; |
2658 | ret = my_waitpid (-1, wstatp, options | WNOHANG); | |
d8301ad1 | 2659 | |
fa96cb38 PA |
2660 | if (debug_threads) |
2661 | debug_printf ("LWFE: waitpid(-1, ...) returned %d, %s\n", | |
6d91ce9a | 2662 | ret, errno ? safe_strerror (errno) : "ERRNO-OK"); |
0d62e5e8 | 2663 | |
fa96cb38 | 2664 | if (ret > 0) |
0d62e5e8 | 2665 | { |
89be2091 | 2666 | if (debug_threads) |
bd99dc85 | 2667 | { |
fa96cb38 PA |
2668 | debug_printf ("LLW: waitpid %ld received %s\n", |
2669 | (long) ret, status_to_str (*wstatp)); | |
bd99dc85 | 2670 | } |
89be2091 | 2671 | |
582511be PA |
2672 | /* Filter all events. IOW, leave all events pending. We'll |
2673 | randomly select an event LWP out of all that have events | |
2674 | below. */ | |
d16f3f6c | 2675 | filter_event (ret, *wstatp); |
fa96cb38 PA |
2676 | /* Retry until nothing comes out of waitpid. A single |
2677 | SIGCHLD can indicate more than one child stopped. */ | |
89be2091 DJ |
2678 | continue; |
2679 | } | |
2680 | ||
20ba1ce6 PA |
2681 | /* Now that we've pulled all events out of the kernel, resume |
2682 | LWPs that don't have an interesting event to report. */ | |
2683 | if (stopping_threads == NOT_STOPPING_THREADS) | |
df95181f TBA |
2684 | for_each_thread ([this] (thread_info *thread) |
2685 | { | |
2686 | resume_stopped_resumed_lwps (thread); | |
2687 | }); | |
20ba1ce6 PA |
2688 | |
2689 | /* ... and find an LWP with a status to report to the core, if | |
2690 | any. */ | |
83e1b6c1 SM |
2691 | event_thread = find_thread_in_random ([&] (thread_info *thread) |
2692 | { | |
2693 | return status_pending_p_callback (thread, filter_ptid); | |
2694 | }); | |
2695 | ||
582511be PA |
2696 | if (event_thread != NULL) |
2697 | { | |
2698 | event_child = get_thread_lwp (event_thread); | |
2699 | *wstatp = event_child->status_pending; | |
2700 | event_child->status_pending_p = 0; | |
2701 | event_child->status_pending = 0; | |
2702 | break; | |
2703 | } | |
2704 | ||
fa96cb38 PA |
2705 | /* Check for zombie thread group leaders. Those can't be reaped |
2706 | until all other threads in the thread group are. */ | |
2707 | check_zombie_leaders (); | |
2708 | ||
a1385b7b SM |
2709 | auto not_stopped = [&] (thread_info *thread) |
2710 | { | |
2711 | return not_stopped_callback (thread, wait_ptid); | |
2712 | }; | |
2713 | ||
fa96cb38 PA |
2714 | /* If there are no resumed children left in the set of LWPs we |
2715 | want to wait for, bail. We can't just block in | |
2716 | waitpid/sigsuspend, because lwps might have been left stopped | |
2717 | in trace-stop state, and we'd be stuck forever waiting for | |
2718 | their status to change (which would only happen if we resumed | |
2719 | them). Even if WNOHANG is set, this return code is preferred | |
2720 | over 0 (below), as it is more detailed. */ | |
a1385b7b | 2721 | if (find_thread (not_stopped) == NULL) |
a6dbe5df | 2722 | { |
fa96cb38 PA |
2723 | if (debug_threads) |
2724 | debug_printf ("LLW: exit (no unwaited-for LWP)\n"); | |
21987b9c | 2725 | gdb_sigmask (SIG_SETMASK, &prev_mask, NULL); |
fa96cb38 | 2726 | return -1; |
a6dbe5df PA |
2727 | } |
2728 | ||
fa96cb38 PA |
2729 | /* No interesting event to report to the caller. */ |
2730 | if ((options & WNOHANG)) | |
24a09b5f | 2731 | { |
fa96cb38 PA |
2732 | if (debug_threads) |
2733 | debug_printf ("WNOHANG set, no event found\n"); | |
2734 | ||
21987b9c | 2735 | gdb_sigmask (SIG_SETMASK, &prev_mask, NULL); |
fa96cb38 | 2736 | return 0; |
24a09b5f DJ |
2737 | } |
2738 | ||
fa96cb38 PA |
2739 | /* Block until we get an event reported with SIGCHLD. */ |
2740 | if (debug_threads) | |
2741 | debug_printf ("sigsuspend'ing\n"); | |
d50171e4 | 2742 | |
fa96cb38 | 2743 | sigsuspend (&prev_mask); |
21987b9c | 2744 | gdb_sigmask (SIG_SETMASK, &prev_mask, NULL); |
fa96cb38 PA |
2745 | goto retry; |
2746 | } | |
d50171e4 | 2747 | |
21987b9c | 2748 | gdb_sigmask (SIG_SETMASK, &prev_mask, NULL); |
d50171e4 | 2749 | |
0bfdf32f | 2750 | current_thread = event_thread; |
d50171e4 | 2751 | |
fa96cb38 PA |
2752 | return lwpid_of (event_thread); |
2753 | } | |
2754 | ||
d16f3f6c TBA |
2755 | int |
2756 | linux_process_target::wait_for_event (ptid_t ptid, int *wstatp, int options) | |
fa96cb38 | 2757 | { |
d16f3f6c | 2758 | return wait_for_event_filtered (ptid, ptid, wstatp, options); |
611cb4a5 DJ |
2759 | } |
2760 | ||
6bf5e0ba PA |
2761 | /* Select one LWP out of those that have events pending. */ |
2762 | ||
2763 | static void | |
2764 | select_event_lwp (struct lwp_info **orig_lp) | |
2765 | { | |
582511be PA |
2766 | struct thread_info *event_thread = NULL; |
2767 | ||
2768 | /* In all-stop, give preference to the LWP that is being | |
2769 | single-stepped. There will be at most one, and it's the LWP that | |
2770 | the core is most interested in. If we didn't do this, then we'd | |
2771 | have to handle pending step SIGTRAPs somehow in case the core | |
2772 | later continues the previously-stepped thread, otherwise we'd | |
2773 | report the pending SIGTRAP, and the core, not having stepped the | |
2774 | thread, wouldn't understand what the trap was for, and therefore | |
2775 | would report it to the user as a random signal. */ | |
2776 | if (!non_stop) | |
6bf5e0ba | 2777 | { |
39a64da5 SM |
2778 | event_thread = find_thread ([] (thread_info *thread) |
2779 | { | |
2780 | lwp_info *lp = get_thread_lwp (thread); | |
2781 | ||
2782 | return (thread->last_status.kind == TARGET_WAITKIND_IGNORE | |
2783 | && thread->last_resume_kind == resume_step | |
2784 | && lp->status_pending_p); | |
2785 | }); | |
2786 | ||
582511be PA |
2787 | if (event_thread != NULL) |
2788 | { | |
2789 | if (debug_threads) | |
2790 | debug_printf ("SEL: Select single-step %s\n", | |
2791 | target_pid_to_str (ptid_of (event_thread))); | |
2792 | } | |
6bf5e0ba | 2793 | } |
582511be | 2794 | if (event_thread == NULL) |
6bf5e0ba PA |
2795 | { |
2796 | /* No single-stepping LWP. Select one at random, out of those | |
b90fc188 | 2797 | which have had events. */ |
6bf5e0ba | 2798 | |
b0319eaa | 2799 | event_thread = find_thread_in_random ([&] (thread_info *thread) |
39a64da5 SM |
2800 | { |
2801 | lwp_info *lp = get_thread_lwp (thread); | |
2802 | ||
b0319eaa TT |
2803 | /* Only resumed LWPs that have an event pending. */ |
2804 | return (thread->last_status.kind == TARGET_WAITKIND_IGNORE | |
2805 | && lp->status_pending_p); | |
39a64da5 | 2806 | }); |
6bf5e0ba PA |
2807 | } |
2808 | ||
d86d4aaf | 2809 | if (event_thread != NULL) |
6bf5e0ba | 2810 | { |
d86d4aaf DE |
2811 | struct lwp_info *event_lp = get_thread_lwp (event_thread); |
2812 | ||
6bf5e0ba PA |
2813 | /* Switch the event LWP. */ |
2814 | *orig_lp = event_lp; | |
2815 | } | |
2816 | } | |
2817 | ||
7984d532 PA |
2818 | /* Decrement the suspend count of all LWPs, except EXCEPT, if non |
2819 | NULL. */ | |
2820 | ||
2821 | static void | |
2822 | unsuspend_all_lwps (struct lwp_info *except) | |
2823 | { | |
139720c5 SM |
2824 | for_each_thread ([&] (thread_info *thread) |
2825 | { | |
2826 | lwp_info *lwp = get_thread_lwp (thread); | |
2827 | ||
2828 | if (lwp != except) | |
2829 | lwp_suspended_decr (lwp); | |
2830 | }); | |
7984d532 PA |
2831 | } |
2832 | ||
fcb056a5 | 2833 | static bool stuck_in_jump_pad_callback (thread_info *thread); |
5a6b0a41 | 2834 | static bool lwp_running (thread_info *thread); |
fa593d66 PA |
2835 | |
2836 | /* Stabilize threads (move out of jump pads). | |
2837 | ||
2838 | If a thread is midway collecting a fast tracepoint, we need to | |
2839 | finish the collection and move it out of the jump pad before | |
2840 | reporting the signal. | |
2841 | ||
2842 | This avoids recursion while collecting (when a signal arrives | |
2843 | midway, and the signal handler itself collects), which would trash | |
2844 | the trace buffer. In case the user set a breakpoint in a signal | |
2845 | handler, this avoids the backtrace showing the jump pad, etc.. | |
2846 | Most importantly, there are certain things we can't do safely if | |
2847 | threads are stopped in a jump pad (or in its callee's). For | |
2848 | example: | |
2849 | ||
2850 | - starting a new trace run. A thread still collecting the | |
2851 | previous run, could trash the trace buffer when resumed. The trace | |
2852 | buffer control structures would have been reset but the thread had | |
2853 | no way to tell. The thread could even midway memcpy'ing to the | |
2854 | buffer, which would mean that when resumed, it would clobber the | |
2855 | trace buffer that had been set for a new run. | |
2856 | ||
2857 | - we can't rewrite/reuse the jump pads for new tracepoints | |
2858 | safely. Say you do tstart while a thread is stopped midway while | |
2859 | collecting. When the thread is later resumed, it finishes the | |
2860 | collection, and returns to the jump pad, to execute the original | |
2861 | instruction that was under the tracepoint jump at the time the | |
2862 | older run had been started. If the jump pad had been rewritten | |
2863 | since for something else in the new run, the thread would now | |
2864 | execute the wrong / random instructions. */ | |
2865 | ||
5c9eb2f2 TBA |
2866 | void |
2867 | linux_process_target::stabilize_threads () | |
fa593d66 | 2868 | { |
fcb056a5 | 2869 | thread_info *thread_stuck = find_thread (stuck_in_jump_pad_callback); |
fa593d66 | 2870 | |
d86d4aaf | 2871 | if (thread_stuck != NULL) |
fa593d66 | 2872 | { |
b4d51a55 | 2873 | if (debug_threads) |
87ce2a04 | 2874 | debug_printf ("can't stabilize, LWP %ld is stuck in jump pad\n", |
d86d4aaf | 2875 | lwpid_of (thread_stuck)); |
fa593d66 PA |
2876 | return; |
2877 | } | |
2878 | ||
fcb056a5 | 2879 | thread_info *saved_thread = current_thread; |
fa593d66 PA |
2880 | |
2881 | stabilizing_threads = 1; | |
2882 | ||
2883 | /* Kick 'em all. */ | |
d16f3f6c TBA |
2884 | for_each_thread ([this] (thread_info *thread) |
2885 | { | |
2886 | move_out_of_jump_pad (thread); | |
2887 | }); | |
fa593d66 PA |
2888 | |
2889 | /* Loop until all are stopped out of the jump pads. */ | |
5a6b0a41 | 2890 | while (find_thread (lwp_running) != NULL) |
fa593d66 PA |
2891 | { |
2892 | struct target_waitstatus ourstatus; | |
2893 | struct lwp_info *lwp; | |
fa593d66 PA |
2894 | int wstat; |
2895 | ||
2896 | /* Note that we go through the full wait even loop. While | |
2897 | moving threads out of jump pad, we need to be able to step | |
2898 | over internal breakpoints and such. */ | |
d16f3f6c | 2899 | wait_1 (minus_one_ptid, &ourstatus, 0); |
fa593d66 PA |
2900 | |
2901 | if (ourstatus.kind == TARGET_WAITKIND_STOPPED) | |
2902 | { | |
0bfdf32f | 2903 | lwp = get_thread_lwp (current_thread); |
fa593d66 PA |
2904 | |
2905 | /* Lock it. */ | |
863d01bd | 2906 | lwp_suspended_inc (lwp); |
fa593d66 | 2907 | |
a493e3e2 | 2908 | if (ourstatus.value.sig != GDB_SIGNAL_0 |
0bfdf32f | 2909 | || current_thread->last_resume_kind == resume_stop) |
fa593d66 | 2910 | { |
2ea28649 | 2911 | wstat = W_STOPCODE (gdb_signal_to_host (ourstatus.value.sig)); |
fa593d66 PA |
2912 | enqueue_one_deferred_signal (lwp, &wstat); |
2913 | } | |
2914 | } | |
2915 | } | |
2916 | ||
fcdad592 | 2917 | unsuspend_all_lwps (NULL); |
fa593d66 PA |
2918 | |
2919 | stabilizing_threads = 0; | |
2920 | ||
0bfdf32f | 2921 | current_thread = saved_thread; |
fa593d66 | 2922 | |
b4d51a55 | 2923 | if (debug_threads) |
fa593d66 | 2924 | { |
fcb056a5 SM |
2925 | thread_stuck = find_thread (stuck_in_jump_pad_callback); |
2926 | ||
d86d4aaf | 2927 | if (thread_stuck != NULL) |
87ce2a04 | 2928 | debug_printf ("couldn't stabilize, LWP %ld got stuck in jump pad\n", |
d86d4aaf | 2929 | lwpid_of (thread_stuck)); |
fa593d66 PA |
2930 | } |
2931 | } | |
2932 | ||
582511be PA |
2933 | /* Convenience function that is called when the kernel reports an |
2934 | event that is not passed out to GDB. */ | |
2935 | ||
2936 | static ptid_t | |
2937 | ignore_event (struct target_waitstatus *ourstatus) | |
2938 | { | |
2939 | /* If we got an event, there may still be others, as a single | |
2940 | SIGCHLD can indicate more than one child stopped. This forces | |
2941 | another target_wait call. */ | |
2942 | async_file_mark (); | |
2943 | ||
2944 | ourstatus->kind = TARGET_WAITKIND_IGNORE; | |
2945 | return null_ptid; | |
2946 | } | |
2947 | ||
65706a29 PA |
2948 | /* Convenience function that is called when the kernel reports an exit |
2949 | event. This decides whether to report the event to GDB as a | |
2950 | process exit event, a thread exit event, or to suppress the | |
2951 | event. */ | |
2952 | ||
2953 | static ptid_t | |
2954 | filter_exit_event (struct lwp_info *event_child, | |
2955 | struct target_waitstatus *ourstatus) | |
2956 | { | |
c12a5089 | 2957 | client_state &cs = get_client_state (); |
65706a29 PA |
2958 | struct thread_info *thread = get_lwp_thread (event_child); |
2959 | ptid_t ptid = ptid_of (thread); | |
2960 | ||
2961 | if (!last_thread_of_process_p (pid_of (thread))) | |
2962 | { | |
c12a5089 | 2963 | if (cs.report_thread_events) |
65706a29 PA |
2964 | ourstatus->kind = TARGET_WAITKIND_THREAD_EXITED; |
2965 | else | |
2966 | ourstatus->kind = TARGET_WAITKIND_IGNORE; | |
2967 | ||
2968 | delete_lwp (event_child); | |
2969 | } | |
2970 | return ptid; | |
2971 | } | |
2972 | ||
82075af2 JS |
2973 | /* Returns 1 if GDB is interested in any event_child syscalls. */ |
2974 | ||
2975 | static int | |
2976 | gdb_catching_syscalls_p (struct lwp_info *event_child) | |
2977 | { | |
2978 | struct thread_info *thread = get_lwp_thread (event_child); | |
2979 | struct process_info *proc = get_thread_process (thread); | |
2980 | ||
f27866ba | 2981 | return !proc->syscalls_to_catch.empty (); |
82075af2 JS |
2982 | } |
2983 | ||
2984 | /* Returns 1 if GDB is interested in the event_child syscall. | |
2985 | Only to be called when stopped reason is SYSCALL_SIGTRAP. */ | |
2986 | ||
2987 | static int | |
2988 | gdb_catch_this_syscall_p (struct lwp_info *event_child) | |
2989 | { | |
4cc32bec | 2990 | int sysno; |
82075af2 JS |
2991 | struct thread_info *thread = get_lwp_thread (event_child); |
2992 | struct process_info *proc = get_thread_process (thread); | |
2993 | ||
f27866ba | 2994 | if (proc->syscalls_to_catch.empty ()) |
82075af2 JS |
2995 | return 0; |
2996 | ||
f27866ba | 2997 | if (proc->syscalls_to_catch[0] == ANY_SYSCALL) |
82075af2 JS |
2998 | return 1; |
2999 | ||
4cc32bec | 3000 | get_syscall_trapinfo (event_child, &sysno); |
f27866ba SM |
3001 | |
3002 | for (int iter : proc->syscalls_to_catch) | |
82075af2 JS |
3003 | if (iter == sysno) |
3004 | return 1; | |
3005 | ||
3006 | return 0; | |
3007 | } | |
3008 | ||
d16f3f6c TBA |
3009 | ptid_t |
3010 | linux_process_target::wait_1 (ptid_t ptid, target_waitstatus *ourstatus, | |
3011 | int target_options) | |
da6d8c04 | 3012 | { |
c12a5089 | 3013 | client_state &cs = get_client_state (); |
e5f1222d | 3014 | int w; |
fc7238bb | 3015 | struct lwp_info *event_child; |
bd99dc85 | 3016 | int options; |
bd99dc85 | 3017 | int pid; |
6bf5e0ba PA |
3018 | int step_over_finished; |
3019 | int bp_explains_trap; | |
3020 | int maybe_internal_trap; | |
3021 | int report_to_gdb; | |
219f2f23 | 3022 | int trace_event; |
c2d6af84 | 3023 | int in_step_range; |
f2faf941 | 3024 | int any_resumed; |
bd99dc85 | 3025 | |
87ce2a04 DE |
3026 | if (debug_threads) |
3027 | { | |
3028 | debug_enter (); | |
d16f3f6c | 3029 | debug_printf ("wait_1: [%s]\n", target_pid_to_str (ptid)); |
87ce2a04 DE |
3030 | } |
3031 | ||
bd99dc85 PA |
3032 | /* Translate generic target options into linux options. */ |
3033 | options = __WALL; | |
3034 | if (target_options & TARGET_WNOHANG) | |
3035 | options |= WNOHANG; | |
0d62e5e8 | 3036 | |
fa593d66 PA |
3037 | bp_explains_trap = 0; |
3038 | trace_event = 0; | |
c2d6af84 | 3039 | in_step_range = 0; |
bd99dc85 PA |
3040 | ourstatus->kind = TARGET_WAITKIND_IGNORE; |
3041 | ||
83e1b6c1 SM |
3042 | auto status_pending_p_any = [&] (thread_info *thread) |
3043 | { | |
3044 | return status_pending_p_callback (thread, minus_one_ptid); | |
3045 | }; | |
3046 | ||
a1385b7b SM |
3047 | auto not_stopped = [&] (thread_info *thread) |
3048 | { | |
3049 | return not_stopped_callback (thread, minus_one_ptid); | |
3050 | }; | |
3051 | ||
f2faf941 | 3052 | /* Find a resumed LWP, if any. */ |
83e1b6c1 | 3053 | if (find_thread (status_pending_p_any) != NULL) |
f2faf941 | 3054 | any_resumed = 1; |
a1385b7b | 3055 | else if (find_thread (not_stopped) != NULL) |
f2faf941 PA |
3056 | any_resumed = 1; |
3057 | else | |
3058 | any_resumed = 0; | |
3059 | ||
d7e15655 | 3060 | if (step_over_bkpt == null_ptid) |
d16f3f6c | 3061 | pid = wait_for_event (ptid, &w, options); |
6bf5e0ba PA |
3062 | else |
3063 | { | |
3064 | if (debug_threads) | |
87ce2a04 DE |
3065 | debug_printf ("step_over_bkpt set [%s], doing a blocking wait\n", |
3066 | target_pid_to_str (step_over_bkpt)); | |
d16f3f6c | 3067 | pid = wait_for_event (step_over_bkpt, &w, options & ~WNOHANG); |
6bf5e0ba PA |
3068 | } |
3069 | ||
f2faf941 | 3070 | if (pid == 0 || (pid == -1 && !any_resumed)) |
87ce2a04 | 3071 | { |
fa96cb38 PA |
3072 | gdb_assert (target_options & TARGET_WNOHANG); |
3073 | ||
87ce2a04 DE |
3074 | if (debug_threads) |
3075 | { | |
d16f3f6c | 3076 | debug_printf ("wait_1 ret = null_ptid, " |
fa96cb38 | 3077 | "TARGET_WAITKIND_IGNORE\n"); |
87ce2a04 DE |
3078 | debug_exit (); |
3079 | } | |
fa96cb38 PA |
3080 | |
3081 | ourstatus->kind = TARGET_WAITKIND_IGNORE; | |
87ce2a04 DE |
3082 | return null_ptid; |
3083 | } | |
fa96cb38 PA |
3084 | else if (pid == -1) |
3085 | { | |
3086 | if (debug_threads) | |
3087 | { | |
d16f3f6c | 3088 | debug_printf ("wait_1 ret = null_ptid, " |
fa96cb38 PA |
3089 | "TARGET_WAITKIND_NO_RESUMED\n"); |
3090 | debug_exit (); | |
3091 | } | |
bd99dc85 | 3092 | |
fa96cb38 PA |
3093 | ourstatus->kind = TARGET_WAITKIND_NO_RESUMED; |
3094 | return null_ptid; | |
3095 | } | |
0d62e5e8 | 3096 | |
0bfdf32f | 3097 | event_child = get_thread_lwp (current_thread); |
0d62e5e8 | 3098 | |
d16f3f6c | 3099 | /* wait_for_event only returns an exit status for the last |
fa96cb38 PA |
3100 | child of a process. Report it. */ |
3101 | if (WIFEXITED (w) || WIFSIGNALED (w)) | |
da6d8c04 | 3102 | { |
fa96cb38 | 3103 | if (WIFEXITED (w)) |
0d62e5e8 | 3104 | { |
fa96cb38 PA |
3105 | ourstatus->kind = TARGET_WAITKIND_EXITED; |
3106 | ourstatus->value.integer = WEXITSTATUS (w); | |
bd99dc85 | 3107 | |
fa96cb38 | 3108 | if (debug_threads) |
bd99dc85 | 3109 | { |
d16f3f6c | 3110 | debug_printf ("wait_1 ret = %s, exited with " |
fa96cb38 | 3111 | "retcode %d\n", |
0bfdf32f | 3112 | target_pid_to_str (ptid_of (current_thread)), |
fa96cb38 PA |
3113 | WEXITSTATUS (w)); |
3114 | debug_exit (); | |
bd99dc85 | 3115 | } |
fa96cb38 PA |
3116 | } |
3117 | else | |
3118 | { | |
3119 | ourstatus->kind = TARGET_WAITKIND_SIGNALLED; | |
3120 | ourstatus->value.sig = gdb_signal_from_host (WTERMSIG (w)); | |
5b1c542e | 3121 | |
fa96cb38 PA |
3122 | if (debug_threads) |
3123 | { | |
d16f3f6c | 3124 | debug_printf ("wait_1 ret = %s, terminated with " |
fa96cb38 | 3125 | "signal %d\n", |
0bfdf32f | 3126 | target_pid_to_str (ptid_of (current_thread)), |
fa96cb38 PA |
3127 | WTERMSIG (w)); |
3128 | debug_exit (); | |
3129 | } | |
0d62e5e8 | 3130 | } |
fa96cb38 | 3131 | |
65706a29 PA |
3132 | if (ourstatus->kind == TARGET_WAITKIND_EXITED) |
3133 | return filter_exit_event (event_child, ourstatus); | |
3134 | ||
0bfdf32f | 3135 | return ptid_of (current_thread); |
da6d8c04 DJ |
3136 | } |
3137 | ||
2d97cd35 AT |
3138 | /* If step-over executes a breakpoint instruction, in the case of a |
3139 | hardware single step it means a gdb/gdbserver breakpoint had been | |
3140 | planted on top of a permanent breakpoint, in the case of a software | |
3141 | single step it may just mean that gdbserver hit the reinsert breakpoint. | |
e7ad2f14 | 3142 | The PC has been adjusted by save_stop_reason to point at |
2d97cd35 AT |
3143 | the breakpoint address. |
3144 | So in the case of the hardware single step advance the PC manually | |
3145 | past the breakpoint and in the case of software single step advance only | |
3b9a79ef | 3146 | if it's not the single_step_breakpoint we are hitting. |
2d97cd35 AT |
3147 | This avoids that a program would keep trapping a permanent breakpoint |
3148 | forever. */ | |
d7e15655 | 3149 | if (step_over_bkpt != null_ptid |
2d97cd35 AT |
3150 | && event_child->stop_reason == TARGET_STOPPED_BY_SW_BREAKPOINT |
3151 | && (event_child->stepping | |
3b9a79ef | 3152 | || !single_step_breakpoint_inserted_here (event_child->stop_pc))) |
8090aef2 | 3153 | { |
dd373349 AT |
3154 | int increment_pc = 0; |
3155 | int breakpoint_kind = 0; | |
3156 | CORE_ADDR stop_pc = event_child->stop_pc; | |
3157 | ||
d16f3f6c TBA |
3158 | breakpoint_kind = breakpoint_kind_from_current_state (&stop_pc); |
3159 | sw_breakpoint_from_kind (breakpoint_kind, &increment_pc); | |
8090aef2 PA |
3160 | |
3161 | if (debug_threads) | |
3162 | { | |
3163 | debug_printf ("step-over for %s executed software breakpoint\n", | |
3164 | target_pid_to_str (ptid_of (current_thread))); | |
3165 | } | |
3166 | ||
3167 | if (increment_pc != 0) | |
3168 | { | |
3169 | struct regcache *regcache | |
3170 | = get_thread_regcache (current_thread, 1); | |
3171 | ||
3172 | event_child->stop_pc += increment_pc; | |
3173 | (*the_low_target.set_pc) (regcache, event_child->stop_pc); | |
3174 | ||
3175 | if (!(*the_low_target.breakpoint_at) (event_child->stop_pc)) | |
15c66dd6 | 3176 | event_child->stop_reason = TARGET_STOPPED_BY_NO_REASON; |
8090aef2 PA |
3177 | } |
3178 | } | |
3179 | ||
6bf5e0ba PA |
3180 | /* If this event was not handled before, and is not a SIGTRAP, we |
3181 | report it. SIGILL and SIGSEGV are also treated as traps in case | |
3182 | a breakpoint is inserted at the current PC. If this target does | |
3183 | not support internal breakpoints at all, we also report the | |
3184 | SIGTRAP without further processing; it's of no concern to us. */ | |
3185 | maybe_internal_trap | |
3186 | = (supports_breakpoints () | |
3187 | && (WSTOPSIG (w) == SIGTRAP | |
3188 | || ((WSTOPSIG (w) == SIGILL | |
3189 | || WSTOPSIG (w) == SIGSEGV) | |
3190 | && (*the_low_target.breakpoint_at) (event_child->stop_pc)))); | |
3191 | ||
3192 | if (maybe_internal_trap) | |
3193 | { | |
3194 | /* Handle anything that requires bookkeeping before deciding to | |
3195 | report the event or continue waiting. */ | |
3196 | ||
3197 | /* First check if we can explain the SIGTRAP with an internal | |
3198 | breakpoint, or if we should possibly report the event to GDB. | |
3199 | Do this before anything that may remove or insert a | |
3200 | breakpoint. */ | |
3201 | bp_explains_trap = breakpoint_inserted_here (event_child->stop_pc); | |
3202 | ||
3203 | /* We have a SIGTRAP, possibly a step-over dance has just | |
3204 | finished. If so, tweak the state machine accordingly, | |
3b9a79ef YQ |
3205 | reinsert breakpoints and delete any single-step |
3206 | breakpoints. */ | |
6bf5e0ba PA |
3207 | step_over_finished = finish_step_over (event_child); |
3208 | ||
3209 | /* Now invoke the callbacks of any internal breakpoints there. */ | |
3210 | check_breakpoints (event_child->stop_pc); | |
3211 | ||
219f2f23 PA |
3212 | /* Handle tracepoint data collecting. This may overflow the |
3213 | trace buffer, and cause a tracing stop, removing | |
3214 | breakpoints. */ | |
3215 | trace_event = handle_tracepoints (event_child); | |
3216 | ||
6bf5e0ba PA |
3217 | if (bp_explains_trap) |
3218 | { | |
6bf5e0ba | 3219 | if (debug_threads) |
87ce2a04 | 3220 | debug_printf ("Hit a gdbserver breakpoint.\n"); |
6bf5e0ba PA |
3221 | } |
3222 | } | |
3223 | else | |
3224 | { | |
3225 | /* We have some other signal, possibly a step-over dance was in | |
3226 | progress, and it should be cancelled too. */ | |
3227 | step_over_finished = finish_step_over (event_child); | |
fa593d66 PA |
3228 | } |
3229 | ||
3230 | /* We have all the data we need. Either report the event to GDB, or | |
3231 | resume threads and keep waiting for more. */ | |
3232 | ||
3233 | /* If we're collecting a fast tracepoint, finish the collection and | |
3234 | move out of the jump pad before delivering a signal. See | |
3235 | linux_stabilize_threads. */ | |
3236 | ||
3237 | if (WIFSTOPPED (w) | |
3238 | && WSTOPSIG (w) != SIGTRAP | |
3239 | && supports_fast_tracepoints () | |
58b4daa5 | 3240 | && agent_loaded_p ()) |
fa593d66 PA |
3241 | { |
3242 | if (debug_threads) | |
87ce2a04 DE |
3243 | debug_printf ("Got signal %d for LWP %ld. Check if we need " |
3244 | "to defer or adjust it.\n", | |
0bfdf32f | 3245 | WSTOPSIG (w), lwpid_of (current_thread)); |
fa593d66 PA |
3246 | |
3247 | /* Allow debugging the jump pad itself. */ | |
0bfdf32f | 3248 | if (current_thread->last_resume_kind != resume_step |
fa593d66 PA |
3249 | && maybe_move_out_of_jump_pad (event_child, &w)) |
3250 | { | |
3251 | enqueue_one_deferred_signal (event_child, &w); | |
3252 | ||
3253 | if (debug_threads) | |
87ce2a04 | 3254 | debug_printf ("Signal %d for LWP %ld deferred (in jump pad)\n", |
0bfdf32f | 3255 | WSTOPSIG (w), lwpid_of (current_thread)); |
fa593d66 | 3256 | |
df95181f | 3257 | resume_one_lwp (event_child, 0, 0, NULL); |
582511be | 3258 | |
edeeb602 YQ |
3259 | if (debug_threads) |
3260 | debug_exit (); | |
582511be | 3261 | return ignore_event (ourstatus); |
fa593d66 PA |
3262 | } |
3263 | } | |
219f2f23 | 3264 | |
229d26fc SM |
3265 | if (event_child->collecting_fast_tracepoint |
3266 | != fast_tpoint_collect_result::not_collecting) | |
fa593d66 PA |
3267 | { |
3268 | if (debug_threads) | |
87ce2a04 DE |
3269 | debug_printf ("LWP %ld was trying to move out of the jump pad (%d). " |
3270 | "Check if we're already there.\n", | |
0bfdf32f | 3271 | lwpid_of (current_thread), |
229d26fc | 3272 | (int) event_child->collecting_fast_tracepoint); |
fa593d66 PA |
3273 | |
3274 | trace_event = 1; | |
3275 | ||
3276 | event_child->collecting_fast_tracepoint | |
3277 | = linux_fast_tracepoint_collecting (event_child, NULL); | |
3278 | ||
229d26fc SM |
3279 | if (event_child->collecting_fast_tracepoint |
3280 | != fast_tpoint_collect_result::before_insn) | |
fa593d66 PA |
3281 | { |
3282 | /* No longer need this breakpoint. */ | |
3283 | if (event_child->exit_jump_pad_bkpt != NULL) | |
3284 | { | |
3285 | if (debug_threads) | |
87ce2a04 DE |
3286 | debug_printf ("No longer need exit-jump-pad bkpt; removing it." |
3287 | "stopping all threads momentarily.\n"); | |
fa593d66 PA |
3288 | |
3289 | /* Other running threads could hit this breakpoint. | |
3290 | We don't handle moribund locations like GDB does, | |
3291 | instead we always pause all threads when removing | |
3292 | breakpoints, so that any step-over or | |
3293 | decr_pc_after_break adjustment is always taken | |
3294 | care of while the breakpoint is still | |
3295 | inserted. */ | |
3296 | stop_all_lwps (1, event_child); | |
fa593d66 PA |
3297 | |
3298 | delete_breakpoint (event_child->exit_jump_pad_bkpt); | |
3299 | event_child->exit_jump_pad_bkpt = NULL; | |
3300 | ||
3301 | unstop_all_lwps (1, event_child); | |
3302 | ||
3303 | gdb_assert (event_child->suspended >= 0); | |
3304 | } | |
3305 | } | |
3306 | ||
229d26fc SM |
3307 | if (event_child->collecting_fast_tracepoint |
3308 | == fast_tpoint_collect_result::not_collecting) | |
fa593d66 PA |
3309 | { |
3310 | if (debug_threads) | |
87ce2a04 DE |
3311 | debug_printf ("fast tracepoint finished " |
3312 | "collecting successfully.\n"); | |
fa593d66 PA |
3313 | |
3314 | /* We may have a deferred signal to report. */ | |
3315 | if (dequeue_one_deferred_signal (event_child, &w)) | |
3316 | { | |
3317 | if (debug_threads) | |
87ce2a04 | 3318 | debug_printf ("dequeued one signal.\n"); |
fa593d66 | 3319 | } |
3c11dd79 | 3320 | else |
fa593d66 | 3321 | { |
3c11dd79 | 3322 | if (debug_threads) |
87ce2a04 | 3323 | debug_printf ("no deferred signals.\n"); |
fa593d66 PA |
3324 | |
3325 | if (stabilizing_threads) | |
3326 | { | |
3327 | ourstatus->kind = TARGET_WAITKIND_STOPPED; | |
a493e3e2 | 3328 | ourstatus->value.sig = GDB_SIGNAL_0; |
87ce2a04 DE |
3329 | |
3330 | if (debug_threads) | |
3331 | { | |
d16f3f6c | 3332 | debug_printf ("wait_1 ret = %s, stopped " |
87ce2a04 | 3333 | "while stabilizing threads\n", |
0bfdf32f | 3334 | target_pid_to_str (ptid_of (current_thread))); |
87ce2a04 DE |
3335 | debug_exit (); |
3336 | } | |
3337 | ||
0bfdf32f | 3338 | return ptid_of (current_thread); |
fa593d66 PA |
3339 | } |
3340 | } | |
3341 | } | |
6bf5e0ba PA |
3342 | } |
3343 | ||
e471f25b PA |
3344 | /* Check whether GDB would be interested in this event. */ |
3345 | ||
82075af2 JS |
3346 | /* Check if GDB is interested in this syscall. */ |
3347 | if (WIFSTOPPED (w) | |
3348 | && WSTOPSIG (w) == SYSCALL_SIGTRAP | |
3349 | && !gdb_catch_this_syscall_p (event_child)) | |
3350 | { | |
3351 | if (debug_threads) | |
3352 | { | |
3353 | debug_printf ("Ignored syscall for LWP %ld.\n", | |
3354 | lwpid_of (current_thread)); | |
3355 | } | |
3356 | ||
df95181f | 3357 | resume_one_lwp (event_child, event_child->stepping, 0, NULL); |
edeeb602 YQ |
3358 | |
3359 | if (debug_threads) | |
3360 | debug_exit (); | |
82075af2 JS |
3361 | return ignore_event (ourstatus); |
3362 | } | |
3363 | ||
e471f25b PA |
3364 | /* If GDB is not interested in this signal, don't stop other |
3365 | threads, and don't report it to GDB. Just resume the inferior | |
3366 | right away. We do this for threading-related signals as well as | |
3367 | any that GDB specifically requested we ignore. But never ignore | |
3368 | SIGSTOP if we sent it ourselves, and do not ignore signals when | |
3369 | stepping - they may require special handling to skip the signal | |
c9587f88 AT |
3370 | handler. Also never ignore signals that could be caused by a |
3371 | breakpoint. */ | |
e471f25b | 3372 | if (WIFSTOPPED (w) |
0bfdf32f | 3373 | && current_thread->last_resume_kind != resume_step |
e471f25b | 3374 | && ( |
1a981360 | 3375 | #if defined (USE_THREAD_DB) && !defined (__ANDROID__) |
fe978cb0 | 3376 | (current_process ()->priv->thread_db != NULL |
e471f25b PA |
3377 | && (WSTOPSIG (w) == __SIGRTMIN |
3378 | || WSTOPSIG (w) == __SIGRTMIN + 1)) | |
3379 | || | |
3380 | #endif | |
c12a5089 | 3381 | (cs.pass_signals[gdb_signal_from_host (WSTOPSIG (w))] |
e471f25b | 3382 | && !(WSTOPSIG (w) == SIGSTOP |
c9587f88 AT |
3383 | && current_thread->last_resume_kind == resume_stop) |
3384 | && !linux_wstatus_maybe_breakpoint (w)))) | |
e471f25b PA |
3385 | { |
3386 | siginfo_t info, *info_p; | |
3387 | ||
3388 | if (debug_threads) | |
87ce2a04 | 3389 | debug_printf ("Ignored signal %d for LWP %ld.\n", |
0bfdf32f | 3390 | WSTOPSIG (w), lwpid_of (current_thread)); |
e471f25b | 3391 | |
0bfdf32f | 3392 | if (ptrace (PTRACE_GETSIGINFO, lwpid_of (current_thread), |
b8e1b30e | 3393 | (PTRACE_TYPE_ARG3) 0, &info) == 0) |
e471f25b PA |
3394 | info_p = &info; |
3395 | else | |
3396 | info_p = NULL; | |
863d01bd PA |
3397 | |
3398 | if (step_over_finished) | |
3399 | { | |
3400 | /* We cancelled this thread's step-over above. We still | |
3401 | need to unsuspend all other LWPs, and set them back | |
3402 | running again while the signal handler runs. */ | |
3403 | unsuspend_all_lwps (event_child); | |
3404 | ||
3405 | /* Enqueue the pending signal info so that proceed_all_lwps | |
3406 | doesn't lose it. */ | |
3407 | enqueue_pending_signal (event_child, WSTOPSIG (w), info_p); | |
3408 | ||
3409 | proceed_all_lwps (); | |
3410 | } | |
3411 | else | |
3412 | { | |
df95181f TBA |
3413 | resume_one_lwp (event_child, event_child->stepping, |
3414 | WSTOPSIG (w), info_p); | |
863d01bd | 3415 | } |
edeeb602 YQ |
3416 | |
3417 | if (debug_threads) | |
3418 | debug_exit (); | |
3419 | ||
582511be | 3420 | return ignore_event (ourstatus); |
e471f25b PA |
3421 | } |
3422 | ||
c2d6af84 PA |
3423 | /* Note that all addresses are always "out of the step range" when |
3424 | there's no range to begin with. */ | |
3425 | in_step_range = lwp_in_step_range (event_child); | |
3426 | ||
3427 | /* If GDB wanted this thread to single step, and the thread is out | |
3428 | of the step range, we always want to report the SIGTRAP, and let | |
3429 | GDB handle it. Watchpoints should always be reported. So should | |
3430 | signals we can't explain. A SIGTRAP we can't explain could be a | |
3431 | GDB breakpoint --- we may or not support Z0 breakpoints. If we | |
3432 | do, we're be able to handle GDB breakpoints on top of internal | |
3433 | breakpoints, by handling the internal breakpoint and still | |
3434 | reporting the event to GDB. If we don't, we're out of luck, GDB | |
863d01bd PA |
3435 | won't see the breakpoint hit. If we see a single-step event but |
3436 | the thread should be continuing, don't pass the trap to gdb. | |
3437 | That indicates that we had previously finished a single-step but | |
3438 | left the single-step pending -- see | |
3439 | complete_ongoing_step_over. */ | |
6bf5e0ba | 3440 | report_to_gdb = (!maybe_internal_trap |
0bfdf32f | 3441 | || (current_thread->last_resume_kind == resume_step |
c2d6af84 | 3442 | && !in_step_range) |
15c66dd6 | 3443 | || event_child->stop_reason == TARGET_STOPPED_BY_WATCHPOINT |
863d01bd PA |
3444 | || (!in_step_range |
3445 | && !bp_explains_trap | |
3446 | && !trace_event | |
3447 | && !step_over_finished | |
3448 | && !(current_thread->last_resume_kind == resume_continue | |
3449 | && event_child->stop_reason == TARGET_STOPPED_BY_SINGLE_STEP)) | |
9f3a5c85 | 3450 | || (gdb_breakpoint_here (event_child->stop_pc) |
d3ce09f5 | 3451 | && gdb_condition_true_at_breakpoint (event_child->stop_pc) |
de0d863e | 3452 | && gdb_no_commands_at_breakpoint (event_child->stop_pc)) |
00db26fa | 3453 | || event_child->waitstatus.kind != TARGET_WAITKIND_IGNORE); |
d3ce09f5 SS |
3454 | |
3455 | run_breakpoint_commands (event_child->stop_pc); | |
6bf5e0ba PA |
3456 | |
3457 | /* We found no reason GDB would want us to stop. We either hit one | |
3458 | of our own breakpoints, or finished an internal step GDB | |
3459 | shouldn't know about. */ | |
3460 | if (!report_to_gdb) | |
3461 | { | |
3462 | if (debug_threads) | |
3463 | { | |
3464 | if (bp_explains_trap) | |
87ce2a04 | 3465 | debug_printf ("Hit a gdbserver breakpoint.\n"); |
6bf5e0ba | 3466 | if (step_over_finished) |
87ce2a04 | 3467 | debug_printf ("Step-over finished.\n"); |
219f2f23 | 3468 | if (trace_event) |
87ce2a04 | 3469 | debug_printf ("Tracepoint event.\n"); |
c2d6af84 | 3470 | if (lwp_in_step_range (event_child)) |
87ce2a04 DE |
3471 | debug_printf ("Range stepping pc 0x%s [0x%s, 0x%s).\n", |
3472 | paddress (event_child->stop_pc), | |
3473 | paddress (event_child->step_range_start), | |
3474 | paddress (event_child->step_range_end)); | |
6bf5e0ba PA |
3475 | } |
3476 | ||
3477 | /* We're not reporting this breakpoint to GDB, so apply the | |
3478 | decr_pc_after_break adjustment to the inferior's regcache | |
3479 | ourselves. */ | |
3480 | ||
3481 | if (the_low_target.set_pc != NULL) | |
3482 | { | |
3483 | struct regcache *regcache | |
0bfdf32f | 3484 | = get_thread_regcache (current_thread, 1); |
6bf5e0ba PA |
3485 | (*the_low_target.set_pc) (regcache, event_child->stop_pc); |
3486 | } | |
3487 | ||
7984d532 | 3488 | if (step_over_finished) |
e3652c84 YQ |
3489 | { |
3490 | /* If we have finished stepping over a breakpoint, we've | |
3491 | stopped and suspended all LWPs momentarily except the | |
3492 | stepping one. This is where we resume them all again. | |
3493 | We're going to keep waiting, so use proceed, which | |
3494 | handles stepping over the next breakpoint. */ | |
3495 | unsuspend_all_lwps (event_child); | |
3496 | } | |
3497 | else | |
3498 | { | |
3499 | /* Remove the single-step breakpoints if any. Note that | |
3500 | there isn't single-step breakpoint if we finished stepping | |
3501 | over. */ | |
3502 | if (can_software_single_step () | |
3503 | && has_single_step_breakpoints (current_thread)) | |
3504 | { | |
3505 | stop_all_lwps (0, event_child); | |
3506 | delete_single_step_breakpoints (current_thread); | |
3507 | unstop_all_lwps (0, event_child); | |
3508 | } | |
3509 | } | |
7984d532 | 3510 | |
e3652c84 YQ |
3511 | if (debug_threads) |
3512 | debug_printf ("proceeding all threads.\n"); | |
6bf5e0ba | 3513 | proceed_all_lwps (); |
edeeb602 YQ |
3514 | |
3515 | if (debug_threads) | |
3516 | debug_exit (); | |
3517 | ||
582511be | 3518 | return ignore_event (ourstatus); |
6bf5e0ba PA |
3519 | } |
3520 | ||
3521 | if (debug_threads) | |
3522 | { | |
00db26fa | 3523 | if (event_child->waitstatus.kind != TARGET_WAITKIND_IGNORE) |
ad071a30 | 3524 | { |
23fdd69e SM |
3525 | std::string str |
3526 | = target_waitstatus_to_string (&event_child->waitstatus); | |
ad071a30 | 3527 | |
ad071a30 | 3528 | debug_printf ("LWP %ld: extended event with waitstatus %s\n", |
23fdd69e | 3529 | lwpid_of (get_lwp_thread (event_child)), str.c_str ()); |
ad071a30 | 3530 | } |
0bfdf32f | 3531 | if (current_thread->last_resume_kind == resume_step) |
c2d6af84 PA |
3532 | { |
3533 | if (event_child->step_range_start == event_child->step_range_end) | |
87ce2a04 | 3534 | debug_printf ("GDB wanted to single-step, reporting event.\n"); |
c2d6af84 | 3535 | else if (!lwp_in_step_range (event_child)) |
87ce2a04 | 3536 | debug_printf ("Out of step range, reporting event.\n"); |
c2d6af84 | 3537 | } |
15c66dd6 | 3538 | if (event_child->stop_reason == TARGET_STOPPED_BY_WATCHPOINT) |
87ce2a04 | 3539 | debug_printf ("Stopped by watchpoint.\n"); |
582511be | 3540 | else if (gdb_breakpoint_here (event_child->stop_pc)) |
87ce2a04 | 3541 | debug_printf ("Stopped by GDB breakpoint.\n"); |
6bf5e0ba | 3542 | if (debug_threads) |
87ce2a04 | 3543 | debug_printf ("Hit a non-gdbserver trap event.\n"); |
6bf5e0ba PA |
3544 | } |
3545 | ||
3546 | /* Alright, we're going to report a stop. */ | |
3547 | ||
3b9a79ef | 3548 | /* Remove single-step breakpoints. */ |
8901d193 YQ |
3549 | if (can_software_single_step ()) |
3550 | { | |
3b9a79ef | 3551 | /* Remove single-step breakpoints or not. It it is true, stop all |
8901d193 YQ |
3552 | lwps, so that other threads won't hit the breakpoint in the |
3553 | staled memory. */ | |
3b9a79ef | 3554 | int remove_single_step_breakpoints_p = 0; |
8901d193 YQ |
3555 | |
3556 | if (non_stop) | |
3557 | { | |
3b9a79ef YQ |
3558 | remove_single_step_breakpoints_p |
3559 | = has_single_step_breakpoints (current_thread); | |
8901d193 YQ |
3560 | } |
3561 | else | |
3562 | { | |
3563 | /* In all-stop, a stop reply cancels all previous resume | |
3b9a79ef | 3564 | requests. Delete all single-step breakpoints. */ |
8901d193 | 3565 | |
9c80ecd6 SM |
3566 | find_thread ([&] (thread_info *thread) { |
3567 | if (has_single_step_breakpoints (thread)) | |
3568 | { | |
3569 | remove_single_step_breakpoints_p = 1; | |
3570 | return true; | |
3571 | } | |
8901d193 | 3572 | |
9c80ecd6 SM |
3573 | return false; |
3574 | }); | |
8901d193 YQ |
3575 | } |
3576 | ||
3b9a79ef | 3577 | if (remove_single_step_breakpoints_p) |
8901d193 | 3578 | { |
3b9a79ef | 3579 | /* If we remove single-step breakpoints from memory, stop all lwps, |
8901d193 YQ |
3580 | so that other threads won't hit the breakpoint in the staled |
3581 | memory. */ | |
3582 | stop_all_lwps (0, event_child); | |
3583 | ||
3584 | if (non_stop) | |
3585 | { | |
3b9a79ef YQ |
3586 | gdb_assert (has_single_step_breakpoints (current_thread)); |
3587 | delete_single_step_breakpoints (current_thread); | |
8901d193 YQ |
3588 | } |
3589 | else | |
3590 | { | |
9c80ecd6 SM |
3591 | for_each_thread ([] (thread_info *thread){ |
3592 | if (has_single_step_breakpoints (thread)) | |
3593 | delete_single_step_breakpoints (thread); | |
3594 | }); | |
8901d193 YQ |
3595 | } |
3596 | ||
3597 | unstop_all_lwps (0, event_child); | |
3598 | } | |
3599 | } | |
3600 | ||
582511be | 3601 | if (!stabilizing_threads) |
6bf5e0ba PA |
3602 | { |
3603 | /* In all-stop, stop all threads. */ | |
582511be PA |
3604 | if (!non_stop) |
3605 | stop_all_lwps (0, NULL); | |
6bf5e0ba | 3606 | |
c03e6ccc | 3607 | if (step_over_finished) |
582511be PA |
3608 | { |
3609 | if (!non_stop) | |
3610 | { | |
3611 | /* If we were doing a step-over, all other threads but | |
3612 | the stepping one had been paused in start_step_over, | |
3613 | with their suspend counts incremented. We don't want | |
3614 | to do a full unstop/unpause, because we're in | |
3615 | all-stop mode (so we want threads stopped), but we | |
3616 | still need to unsuspend the other threads, to | |
3617 | decrement their `suspended' count back. */ | |
3618 | unsuspend_all_lwps (event_child); | |
3619 | } | |
3620 | else | |
3621 | { | |
3622 | /* If we just finished a step-over, then all threads had | |
3623 | been momentarily paused. In all-stop, that's fine, | |
3624 | we want threads stopped by now anyway. In non-stop, | |
3625 | we need to re-resume threads that GDB wanted to be | |
3626 | running. */ | |
3627 | unstop_all_lwps (1, event_child); | |
3628 | } | |
3629 | } | |
c03e6ccc | 3630 | |
3aa5cfa0 AT |
3631 | /* If we're not waiting for a specific LWP, choose an event LWP |
3632 | from among those that have had events. Giving equal priority | |
3633 | to all LWPs that have had events helps prevent | |
3634 | starvation. */ | |
d7e15655 | 3635 | if (ptid == minus_one_ptid) |
3aa5cfa0 AT |
3636 | { |
3637 | event_child->status_pending_p = 1; | |
3638 | event_child->status_pending = w; | |
3639 | ||
3640 | select_event_lwp (&event_child); | |
3641 | ||
3642 | /* current_thread and event_child must stay in sync. */ | |
3643 | current_thread = get_lwp_thread (event_child); | |
3644 | ||
3645 | event_child->status_pending_p = 0; | |
3646 | w = event_child->status_pending; | |
3647 | } | |
3648 | ||
3649 | ||
fa593d66 | 3650 | /* Stabilize threads (move out of jump pads). */ |
582511be | 3651 | if (!non_stop) |
5c9eb2f2 | 3652 | target_stabilize_threads (); |
6bf5e0ba PA |
3653 | } |
3654 | else | |
3655 | { | |
3656 | /* If we just finished a step-over, then all threads had been | |
3657 | momentarily paused. In all-stop, that's fine, we want | |
3658 | threads stopped by now anyway. In non-stop, we need to | |
3659 | re-resume threads that GDB wanted to be running. */ | |
3660 | if (step_over_finished) | |
7984d532 | 3661 | unstop_all_lwps (1, event_child); |
6bf5e0ba PA |
3662 | } |
3663 | ||
00db26fa | 3664 | if (event_child->waitstatus.kind != TARGET_WAITKIND_IGNORE) |
de0d863e | 3665 | { |
00db26fa PA |
3666 | /* If the reported event is an exit, fork, vfork or exec, let |
3667 | GDB know. */ | |
5a04c4cf PA |
3668 | |
3669 | /* Break the unreported fork relationship chain. */ | |
3670 | if (event_child->waitstatus.kind == TARGET_WAITKIND_FORKED | |
3671 | || event_child->waitstatus.kind == TARGET_WAITKIND_VFORKED) | |
3672 | { | |
3673 | event_child->fork_relative->fork_relative = NULL; | |
3674 | event_child->fork_relative = NULL; | |
3675 | } | |
3676 | ||
00db26fa | 3677 | *ourstatus = event_child->waitstatus; |
de0d863e DB |
3678 | /* Clear the event lwp's waitstatus since we handled it already. */ |
3679 | event_child->waitstatus.kind = TARGET_WAITKIND_IGNORE; | |
3680 | } | |
3681 | else | |
3682 | ourstatus->kind = TARGET_WAITKIND_STOPPED; | |
5b1c542e | 3683 | |
582511be | 3684 | /* Now that we've selected our final event LWP, un-adjust its PC if |
3e572f71 PA |
3685 | it was a software breakpoint, and the client doesn't know we can |
3686 | adjust the breakpoint ourselves. */ | |
3687 | if (event_child->stop_reason == TARGET_STOPPED_BY_SW_BREAKPOINT | |
c12a5089 | 3688 | && !cs.swbreak_feature) |
582511be PA |
3689 | { |
3690 | int decr_pc = the_low_target.decr_pc_after_break; | |
3691 | ||
3692 | if (decr_pc != 0) | |
3693 | { | |
3694 | struct regcache *regcache | |
3695 | = get_thread_regcache (current_thread, 1); | |
3696 | (*the_low_target.set_pc) (regcache, event_child->stop_pc + decr_pc); | |
3697 | } | |
3698 | } | |
3699 | ||
82075af2 JS |
3700 | if (WSTOPSIG (w) == SYSCALL_SIGTRAP) |
3701 | { | |
82075af2 | 3702 | get_syscall_trapinfo (event_child, |
4cc32bec | 3703 | &ourstatus->value.syscall_number); |
82075af2 JS |
3704 | ourstatus->kind = event_child->syscall_state; |
3705 | } | |
3706 | else if (current_thread->last_resume_kind == resume_stop | |
3707 | && WSTOPSIG (w) == SIGSTOP) | |
bd99dc85 PA |
3708 | { |
3709 | /* A thread that has been requested to stop by GDB with vCont;t, | |
3710 | and it stopped cleanly, so report as SIG0. The use of | |
3711 | SIGSTOP is an implementation detail. */ | |
a493e3e2 | 3712 | ourstatus->value.sig = GDB_SIGNAL_0; |
bd99dc85 | 3713 | } |
0bfdf32f | 3714 | else if (current_thread->last_resume_kind == resume_stop |
8336d594 | 3715 | && WSTOPSIG (w) != SIGSTOP) |
bd99dc85 PA |
3716 | { |
3717 | /* A thread that has been requested to stop by GDB with vCont;t, | |
d50171e4 | 3718 | but, it stopped for other reasons. */ |
2ea28649 | 3719 | ourstatus->value.sig = gdb_signal_from_host (WSTOPSIG (w)); |
bd99dc85 | 3720 | } |
de0d863e | 3721 | else if (ourstatus->kind == TARGET_WAITKIND_STOPPED) |
bd99dc85 | 3722 | { |
2ea28649 | 3723 | ourstatus->value.sig = gdb_signal_from_host (WSTOPSIG (w)); |
bd99dc85 PA |
3724 | } |
3725 | ||
d7e15655 | 3726 | gdb_assert (step_over_bkpt == null_ptid); |
d50171e4 | 3727 | |
bd99dc85 | 3728 | if (debug_threads) |
87ce2a04 | 3729 | { |
d16f3f6c | 3730 | debug_printf ("wait_1 ret = %s, %d, %d\n", |
0bfdf32f | 3731 | target_pid_to_str (ptid_of (current_thread)), |
87ce2a04 DE |
3732 | ourstatus->kind, ourstatus->value.sig); |
3733 | debug_exit (); | |
3734 | } | |
bd99dc85 | 3735 | |
65706a29 PA |
3736 | if (ourstatus->kind == TARGET_WAITKIND_EXITED) |
3737 | return filter_exit_event (event_child, ourstatus); | |
3738 | ||
0bfdf32f | 3739 | return ptid_of (current_thread); |
bd99dc85 PA |
3740 | } |
3741 | ||
3742 | /* Get rid of any pending event in the pipe. */ | |
3743 | static void | |
3744 | async_file_flush (void) | |
3745 | { | |
3746 | int ret; | |
3747 | char buf; | |
3748 | ||
3749 | do | |
3750 | ret = read (linux_event_pipe[0], &buf, 1); | |
3751 | while (ret >= 0 || (ret == -1 && errno == EINTR)); | |
3752 | } | |
3753 | ||
3754 | /* Put something in the pipe, so the event loop wakes up. */ | |
3755 | static void | |
3756 | async_file_mark (void) | |
3757 | { | |
3758 | int ret; | |
3759 | ||
3760 | async_file_flush (); | |
3761 | ||
3762 | do | |
3763 | ret = write (linux_event_pipe[1], "+", 1); | |
3764 | while (ret == 0 || (ret == -1 && errno == EINTR)); | |
3765 | ||
3766 | /* Ignore EAGAIN. If the pipe is full, the event loop will already | |
3767 | be awakened anyway. */ | |
3768 | } | |
3769 | ||
6532e7e3 TBA |
3770 | ptid_t |
3771 | linux_process_target::wait (ptid_t ptid, | |
3772 | target_waitstatus *ourstatus, | |
3773 | int target_options) | |
bd99dc85 | 3774 | { |
95954743 | 3775 | ptid_t event_ptid; |
bd99dc85 | 3776 | |
bd99dc85 PA |
3777 | /* Flush the async file first. */ |
3778 | if (target_is_async_p ()) | |
3779 | async_file_flush (); | |
3780 | ||
582511be PA |
3781 | do |
3782 | { | |
d16f3f6c | 3783 | event_ptid = wait_1 (ptid, ourstatus, target_options); |
582511be PA |
3784 | } |
3785 | while ((target_options & TARGET_WNOHANG) == 0 | |
d7e15655 | 3786 | && event_ptid == null_ptid |
582511be | 3787 | && ourstatus->kind == TARGET_WAITKIND_IGNORE); |
bd99dc85 PA |
3788 | |
3789 | /* If at least one stop was reported, there may be more. A single | |
3790 | SIGCHLD can signal more than one child stop. */ | |
3791 | if (target_is_async_p () | |
3792 | && (target_options & TARGET_WNOHANG) != 0 | |
d7e15655 | 3793 | && event_ptid != null_ptid) |
bd99dc85 PA |
3794 | async_file_mark (); |
3795 | ||
3796 | return event_ptid; | |
da6d8c04 DJ |
3797 | } |
3798 | ||
c5f62d5f | 3799 | /* Send a signal to an LWP. */ |
fd500816 DJ |
3800 | |
3801 | static int | |
a1928bad | 3802 | kill_lwp (unsigned long lwpid, int signo) |
fd500816 | 3803 | { |
4a6ed09b | 3804 | int ret; |
fd500816 | 3805 | |
4a6ed09b PA |
3806 | errno = 0; |
3807 | ret = syscall (__NR_tkill, lwpid, signo); | |
3808 | if (errno == ENOSYS) | |
3809 | { | |
3810 | /* If tkill fails, then we are not using nptl threads, a | |
3811 | configuration we no longer support. */ | |
3812 | perror_with_name (("tkill")); | |
3813 | } | |
3814 | return ret; | |
fd500816 DJ |
3815 | } |
3816 | ||
964e4306 PA |
3817 | void |
3818 | linux_stop_lwp (struct lwp_info *lwp) | |
3819 | { | |
3820 | send_sigstop (lwp); | |
3821 | } | |
3822 | ||
0d62e5e8 | 3823 | static void |
02fc4de7 | 3824 | send_sigstop (struct lwp_info *lwp) |
0d62e5e8 | 3825 | { |
bd99dc85 | 3826 | int pid; |
0d62e5e8 | 3827 | |
d86d4aaf | 3828 | pid = lwpid_of (get_lwp_thread (lwp)); |
bd99dc85 | 3829 | |
0d62e5e8 DJ |
3830 | /* If we already have a pending stop signal for this process, don't |
3831 | send another. */ | |
54a0b537 | 3832 | if (lwp->stop_expected) |
0d62e5e8 | 3833 | { |
ae13219e | 3834 | if (debug_threads) |
87ce2a04 | 3835 | debug_printf ("Have pending sigstop for lwp %d\n", pid); |
ae13219e | 3836 | |
0d62e5e8 DJ |
3837 | return; |
3838 | } | |
3839 | ||
3840 | if (debug_threads) | |
87ce2a04 | 3841 | debug_printf ("Sending sigstop to lwp %d\n", pid); |
0d62e5e8 | 3842 | |
d50171e4 | 3843 | lwp->stop_expected = 1; |
bd99dc85 | 3844 | kill_lwp (pid, SIGSTOP); |
0d62e5e8 DJ |
3845 | } |
3846 | ||
df3e4dbe SM |
3847 | static void |
3848 | send_sigstop (thread_info *thread, lwp_info *except) | |
02fc4de7 | 3849 | { |
d86d4aaf | 3850 | struct lwp_info *lwp = get_thread_lwp (thread); |
02fc4de7 | 3851 | |
7984d532 PA |
3852 | /* Ignore EXCEPT. */ |
3853 | if (lwp == except) | |
df3e4dbe | 3854 | return; |
7984d532 | 3855 | |
02fc4de7 | 3856 | if (lwp->stopped) |
df3e4dbe | 3857 | return; |
02fc4de7 PA |
3858 | |
3859 | send_sigstop (lwp); | |
7984d532 PA |
3860 | } |
3861 | ||
3862 | /* Increment the suspend count of an LWP, and stop it, if not stopped | |
3863 | yet. */ | |
df3e4dbe SM |
3864 | static void |
3865 | suspend_and_send_sigstop (thread_info *thread, lwp_info *except) | |
7984d532 | 3866 | { |
d86d4aaf | 3867 | struct lwp_info *lwp = get_thread_lwp (thread); |
7984d532 PA |
3868 | |
3869 | /* Ignore EXCEPT. */ | |
3870 | if (lwp == except) | |
df3e4dbe | 3871 | return; |
7984d532 | 3872 | |
863d01bd | 3873 | lwp_suspended_inc (lwp); |
7984d532 | 3874 | |
df3e4dbe | 3875 | send_sigstop (thread, except); |
02fc4de7 PA |
3876 | } |
3877 | ||
95954743 PA |
3878 | static void |
3879 | mark_lwp_dead (struct lwp_info *lwp, int wstat) | |
3880 | { | |
95954743 PA |
3881 | /* Store the exit status for later. */ |
3882 | lwp->status_pending_p = 1; | |
3883 | lwp->status_pending = wstat; | |
3884 | ||
00db26fa PA |
3885 | /* Store in waitstatus as well, as there's nothing else to process |
3886 | for this event. */ | |
3887 | if (WIFEXITED (wstat)) | |
3888 | { | |
3889 | lwp->waitstatus.kind = TARGET_WAITKIND_EXITED; | |
3890 | lwp->waitstatus.value.integer = WEXITSTATUS (wstat); | |
3891 | } | |
3892 | else if (WIFSIGNALED (wstat)) | |
3893 | { | |
3894 | lwp->waitstatus.kind = TARGET_WAITKIND_SIGNALLED; | |
3895 | lwp->waitstatus.value.sig = gdb_signal_from_host (WTERMSIG (wstat)); | |
3896 | } | |
3897 | ||
95954743 PA |
3898 | /* Prevent trying to stop it. */ |
3899 | lwp->stopped = 1; | |
3900 | ||
3901 | /* No further stops are expected from a dead lwp. */ | |
3902 | lwp->stop_expected = 0; | |
3903 | } | |
3904 | ||
00db26fa PA |
3905 | /* Return true if LWP has exited already, and has a pending exit event |
3906 | to report to GDB. */ | |
3907 | ||
3908 | static int | |
3909 | lwp_is_marked_dead (struct lwp_info *lwp) | |
3910 | { | |
3911 | return (lwp->status_pending_p | |
3912 | && (WIFEXITED (lwp->status_pending) | |
3913 | || WIFSIGNALED (lwp->status_pending))); | |
3914 | } | |
3915 | ||
d16f3f6c TBA |
3916 | void |
3917 | linux_process_target::wait_for_sigstop () | |
0d62e5e8 | 3918 | { |
0bfdf32f | 3919 | struct thread_info *saved_thread; |
95954743 | 3920 | ptid_t saved_tid; |
fa96cb38 PA |
3921 | int wstat; |
3922 | int ret; | |
0d62e5e8 | 3923 | |
0bfdf32f GB |
3924 | saved_thread = current_thread; |
3925 | if (saved_thread != NULL) | |
9c80ecd6 | 3926 | saved_tid = saved_thread->id; |
bd99dc85 | 3927 | else |
95954743 | 3928 | saved_tid = null_ptid; /* avoid bogus unused warning */ |
bd99dc85 | 3929 | |
d50171e4 | 3930 | if (debug_threads) |
fa96cb38 | 3931 | debug_printf ("wait_for_sigstop: pulling events\n"); |
d50171e4 | 3932 | |
fa96cb38 PA |
3933 | /* Passing NULL_PTID as filter indicates we want all events to be |
3934 | left pending. Eventually this returns when there are no | |
3935 | unwaited-for children left. */ | |
d16f3f6c | 3936 | ret = wait_for_event_filtered (minus_one_ptid, null_ptid, &wstat, __WALL); |
fa96cb38 | 3937 | gdb_assert (ret == -1); |
0d62e5e8 | 3938 | |
13d3d99b | 3939 | if (saved_thread == NULL || mythread_alive (saved_tid)) |
0bfdf32f | 3940 | current_thread = saved_thread; |
0d62e5e8 DJ |
3941 | else |
3942 | { | |
3943 | if (debug_threads) | |
87ce2a04 | 3944 | debug_printf ("Previously current thread died.\n"); |
0d62e5e8 | 3945 | |
f0db101d PA |
3946 | /* We can't change the current inferior behind GDB's back, |
3947 | otherwise, a subsequent command may apply to the wrong | |
3948 | process. */ | |
3949 | current_thread = NULL; | |
0d62e5e8 DJ |
3950 | } |
3951 | } | |
3952 | ||
fcb056a5 | 3953 | /* Returns true if THREAD is stopped in a jump pad, and we can't |
fa593d66 PA |
3954 | move it out, because we need to report the stop event to GDB. For |
3955 | example, if the user puts a breakpoint in the jump pad, it's | |
3956 | because she wants to debug it. */ | |
3957 | ||
fcb056a5 SM |
3958 | static bool |
3959 | stuck_in_jump_pad_callback (thread_info *thread) | |
fa593d66 | 3960 | { |
d86d4aaf | 3961 | struct lwp_info *lwp = get_thread_lwp (thread); |
fa593d66 | 3962 | |
863d01bd PA |
3963 | if (lwp->suspended != 0) |
3964 | { | |
3965 | internal_error (__FILE__, __LINE__, | |
3966 | "LWP %ld is suspended, suspended=%d\n", | |
3967 | lwpid_of (thread), lwp->suspended); | |
3968 | } | |
fa593d66 PA |
3969 | gdb_assert (lwp->stopped); |
3970 | ||
3971 | /* Allow debugging the jump pad, gdb_collect, etc.. */ | |
3972 | return (supports_fast_tracepoints () | |
58b4daa5 | 3973 | && agent_loaded_p () |
fa593d66 | 3974 | && (gdb_breakpoint_here (lwp->stop_pc) |
15c66dd6 | 3975 | || lwp->stop_reason == TARGET_STOPPED_BY_WATCHPOINT |
fa593d66 | 3976 | || thread->last_resume_kind == resume_step) |
229d26fc SM |
3977 | && (linux_fast_tracepoint_collecting (lwp, NULL) |
3978 | != fast_tpoint_collect_result::not_collecting)); | |
fa593d66 PA |
3979 | } |
3980 | ||
d16f3f6c TBA |
3981 | void |
3982 | linux_process_target::move_out_of_jump_pad (thread_info *thread) | |
fa593d66 | 3983 | { |
f0ce0d3a | 3984 | struct thread_info *saved_thread; |
d86d4aaf | 3985 | struct lwp_info *lwp = get_thread_lwp (thread); |
fa593d66 PA |
3986 | int *wstat; |
3987 | ||
863d01bd PA |
3988 | if (lwp->suspended != 0) |
3989 | { | |
3990 | internal_error (__FILE__, __LINE__, | |
3991 | "LWP %ld is suspended, suspended=%d\n", | |
3992 | lwpid_of (thread), lwp->suspended); | |
3993 | } | |
fa593d66 PA |
3994 | gdb_assert (lwp->stopped); |
3995 | ||
f0ce0d3a PA |
3996 | /* For gdb_breakpoint_here. */ |
3997 | saved_thread = current_thread; | |
3998 | current_thread = thread; | |
3999 | ||
fa593d66 PA |
4000 | wstat = lwp->status_pending_p ? &lwp->status_pending : NULL; |
4001 | ||
4002 | /* Allow debugging the jump pad, gdb_collect, etc. */ | |
4003 | if (!gdb_breakpoint_here (lwp->stop_pc) | |
15c66dd6 | 4004 | && lwp->stop_reason != TARGET_STOPPED_BY_WATCHPOINT |
fa593d66 PA |
4005 | && thread->last_resume_kind != resume_step |
4006 | && maybe_move_out_of_jump_pad (lwp, wstat)) | |
4007 | { | |
4008 | if (debug_threads) | |
87ce2a04 | 4009 | debug_printf ("LWP %ld needs stabilizing (in jump pad)\n", |
d86d4aaf | 4010 | lwpid_of (thread)); |
fa593d66 PA |
4011 | |
4012 | if (wstat) | |
4013 | { | |
4014 | lwp->status_pending_p = 0; | |
4015 | enqueue_one_deferred_signal (lwp, wstat); | |
4016 | ||
4017 | if (debug_threads) | |
87ce2a04 DE |
4018 | debug_printf ("Signal %d for LWP %ld deferred " |
4019 | "(in jump pad)\n", | |
d86d4aaf | 4020 | WSTOPSIG (*wstat), lwpid_of (thread)); |
fa593d66 PA |
4021 | } |
4022 | ||
df95181f | 4023 | resume_one_lwp (lwp, 0, 0, NULL); |
fa593d66 PA |
4024 | } |
4025 | else | |
863d01bd | 4026 | lwp_suspended_inc (lwp); |
f0ce0d3a PA |
4027 | |
4028 | current_thread = saved_thread; | |
fa593d66 PA |
4029 | } |
4030 | ||
5a6b0a41 SM |
4031 | static bool |
4032 | lwp_running (thread_info *thread) | |
fa593d66 | 4033 | { |
d86d4aaf | 4034 | struct lwp_info *lwp = get_thread_lwp (thread); |
fa593d66 | 4035 | |
00db26fa | 4036 | if (lwp_is_marked_dead (lwp)) |
5a6b0a41 SM |
4037 | return false; |
4038 | ||
4039 | return !lwp->stopped; | |
fa593d66 PA |
4040 | } |
4041 | ||
d16f3f6c TBA |
4042 | void |
4043 | linux_process_target::stop_all_lwps (int suspend, lwp_info *except) | |
0d62e5e8 | 4044 | { |
bde24c0a PA |
4045 | /* Should not be called recursively. */ |
4046 | gdb_assert (stopping_threads == NOT_STOPPING_THREADS); | |
4047 | ||
87ce2a04 DE |
4048 | if (debug_threads) |
4049 | { | |
4050 | debug_enter (); | |
4051 | debug_printf ("stop_all_lwps (%s, except=%s)\n", | |
4052 | suspend ? "stop-and-suspend" : "stop", | |
4053 | except != NULL | |
d86d4aaf | 4054 | ? target_pid_to_str (ptid_of (get_lwp_thread (except))) |
87ce2a04 DE |
4055 | : "none"); |
4056 | } | |
4057 | ||
bde24c0a PA |
4058 | stopping_threads = (suspend |
4059 | ? STOPPING_AND_SUSPENDING_THREADS | |
4060 | : STOPPING_THREADS); | |
7984d532 PA |
4061 | |
4062 | if (suspend) | |
df3e4dbe SM |
4063 | for_each_thread ([&] (thread_info *thread) |
4064 | { | |
4065 | suspend_and_send_sigstop (thread, except); | |
4066 | }); | |
7984d532 | 4067 | else |
df3e4dbe SM |
4068 | for_each_thread ([&] (thread_info *thread) |
4069 | { | |
4070 | send_sigstop (thread, except); | |
4071 | }); | |
4072 | ||
fa96cb38 | 4073 | wait_for_sigstop (); |
bde24c0a | 4074 | stopping_threads = NOT_STOPPING_THREADS; |
87ce2a04 DE |
4075 | |
4076 | if (debug_threads) | |
4077 | { | |
4078 | debug_printf ("stop_all_lwps done, setting stopping_threads " | |
4079 | "back to !stopping\n"); | |
4080 | debug_exit (); | |
4081 | } | |
0d62e5e8 DJ |
4082 | } |
4083 | ||
863d01bd PA |
4084 | /* Enqueue one signal in the chain of signals which need to be |
4085 | delivered to this process on next resume. */ | |
4086 | ||
4087 | static void | |
4088 | enqueue_pending_signal (struct lwp_info *lwp, int signal, siginfo_t *info) | |
4089 | { | |
8d749320 | 4090 | struct pending_signals *p_sig = XNEW (struct pending_signals); |
863d01bd | 4091 | |
863d01bd PA |
4092 | p_sig->prev = lwp->pending_signals; |
4093 | p_sig->signal = signal; | |
4094 | if (info == NULL) | |
4095 | memset (&p_sig->info, 0, sizeof (siginfo_t)); | |
4096 | else | |
4097 | memcpy (&p_sig->info, info, sizeof (siginfo_t)); | |
4098 | lwp->pending_signals = p_sig; | |
4099 | } | |
4100 | ||
df95181f TBA |
4101 | void |
4102 | linux_process_target::install_software_single_step_breakpoints (lwp_info *lwp) | |
fa5308bd | 4103 | { |
984a2c04 YQ |
4104 | struct thread_info *thread = get_lwp_thread (lwp); |
4105 | struct regcache *regcache = get_thread_regcache (thread, 1); | |
8ce47547 TT |
4106 | |
4107 | scoped_restore save_current_thread = make_scoped_restore (¤t_thread); | |
984a2c04 | 4108 | |
984a2c04 | 4109 | current_thread = thread; |
a0ff9e1a | 4110 | std::vector<CORE_ADDR> next_pcs = the_low_target.get_next_pcs (regcache); |
fa5308bd | 4111 | |
a0ff9e1a | 4112 | for (CORE_ADDR pc : next_pcs) |
3b9a79ef | 4113 | set_single_step_breakpoint (pc, current_ptid); |
fa5308bd AT |
4114 | } |
4115 | ||
df95181f TBA |
4116 | int |
4117 | linux_process_target::single_step (lwp_info* lwp) | |
7fe5e27e AT |
4118 | { |
4119 | int step = 0; | |
4120 | ||
4121 | if (can_hardware_single_step ()) | |
4122 | { | |
4123 | step = 1; | |
4124 | } | |
4125 | else if (can_software_single_step ()) | |
4126 | { | |
4127 | install_software_single_step_breakpoints (lwp); | |
4128 | step = 0; | |
4129 | } | |
4130 | else | |
4131 | { | |
4132 | if (debug_threads) | |
4133 | debug_printf ("stepping is not implemented on this target"); | |
4134 | } | |
4135 | ||
4136 | return step; | |
4137 | } | |
4138 | ||
35ac8b3e | 4139 | /* The signal can be delivered to the inferior if we are not trying to |
5b061e98 YQ |
4140 | finish a fast tracepoint collect. Since signal can be delivered in |
4141 | the step-over, the program may go to signal handler and trap again | |
4142 | after return from the signal handler. We can live with the spurious | |
4143 | double traps. */ | |
35ac8b3e YQ |
4144 | |
4145 | static int | |
4146 | lwp_signal_can_be_delivered (struct lwp_info *lwp) | |
4147 | { | |
229d26fc SM |
4148 | return (lwp->collecting_fast_tracepoint |
4149 | == fast_tpoint_collect_result::not_collecting); | |
35ac8b3e YQ |
4150 | } |
4151 | ||
df95181f TBA |
4152 | void |
4153 | linux_process_target::resume_one_lwp_throw (lwp_info *lwp, int step, | |
4154 | int signal, siginfo_t *info) | |
da6d8c04 | 4155 | { |
d86d4aaf | 4156 | struct thread_info *thread = get_lwp_thread (lwp); |
0bfdf32f | 4157 | struct thread_info *saved_thread; |
82075af2 | 4158 | int ptrace_request; |
c06cbd92 YQ |
4159 | struct process_info *proc = get_thread_process (thread); |
4160 | ||
4161 | /* Note that target description may not be initialised | |
4162 | (proc->tdesc == NULL) at this point because the program hasn't | |
4163 | stopped at the first instruction yet. It means GDBserver skips | |
4164 | the extra traps from the wrapper program (see option --wrapper). | |
4165 | Code in this function that requires register access should be | |
4166 | guarded by proc->tdesc == NULL or something else. */ | |
0d62e5e8 | 4167 | |
54a0b537 | 4168 | if (lwp->stopped == 0) |
0d62e5e8 DJ |
4169 | return; |
4170 | ||
65706a29 PA |
4171 | gdb_assert (lwp->waitstatus.kind == TARGET_WAITKIND_IGNORE); |
4172 | ||
229d26fc SM |
4173 | fast_tpoint_collect_result fast_tp_collecting |
4174 | = lwp->collecting_fast_tracepoint; | |
fa593d66 | 4175 | |
229d26fc SM |
4176 | gdb_assert (!stabilizing_threads |
4177 | || (fast_tp_collecting | |
4178 | != fast_tpoint_collect_result::not_collecting)); | |
fa593d66 | 4179 | |
219f2f23 PA |
4180 | /* Cancel actions that rely on GDB not changing the PC (e.g., the |
4181 | user used the "jump" command, or "set $pc = foo"). */ | |
c06cbd92 | 4182 | if (thread->while_stepping != NULL && lwp->stop_pc != get_pc (lwp)) |
219f2f23 PA |
4183 | { |
4184 | /* Collecting 'while-stepping' actions doesn't make sense | |
4185 | anymore. */ | |
d86d4aaf | 4186 | release_while_stepping_state_list (thread); |
219f2f23 PA |
4187 | } |
4188 | ||
0d62e5e8 | 4189 | /* If we have pending signals or status, and a new signal, enqueue the |
35ac8b3e YQ |
4190 | signal. Also enqueue the signal if it can't be delivered to the |
4191 | inferior right now. */ | |
0d62e5e8 | 4192 | if (signal != 0 |
fa593d66 PA |
4193 | && (lwp->status_pending_p |
4194 | || lwp->pending_signals != NULL | |
35ac8b3e | 4195 | || !lwp_signal_can_be_delivered (lwp))) |
94610ec4 YQ |
4196 | { |
4197 | enqueue_pending_signal (lwp, signal, info); | |
4198 | ||
4199 | /* Postpone any pending signal. It was enqueued above. */ | |
4200 | signal = 0; | |
4201 | } | |
0d62e5e8 | 4202 | |
d50171e4 PA |
4203 | if (lwp->status_pending_p) |
4204 | { | |
4205 | if (debug_threads) | |
94610ec4 | 4206 | debug_printf ("Not resuming lwp %ld (%s, stop %s);" |
87ce2a04 | 4207 | " has pending status\n", |
94610ec4 | 4208 | lwpid_of (thread), step ? "step" : "continue", |
87ce2a04 | 4209 | lwp->stop_expected ? "expected" : "not expected"); |
d50171e4 PA |
4210 | return; |
4211 | } | |
0d62e5e8 | 4212 | |
0bfdf32f GB |
4213 | saved_thread = current_thread; |
4214 | current_thread = thread; | |
0d62e5e8 | 4215 | |
0d62e5e8 DJ |
4216 | /* This bit needs some thinking about. If we get a signal that |
4217 | we must report while a single-step reinsert is still pending, | |
4218 | we often end up resuming the thread. It might be better to | |
4219 | (ew) allow a stack of pending events; then we could be sure that | |
4220 | the reinsert happened right away and not lose any signals. | |
4221 | ||
4222 | Making this stack would also shrink the window in which breakpoints are | |
54a0b537 | 4223 | uninserted (see comment in linux_wait_for_lwp) but not enough for |
0d62e5e8 DJ |
4224 | complete correctness, so it won't solve that problem. It may be |
4225 | worthwhile just to solve this one, however. */ | |
54a0b537 | 4226 | if (lwp->bp_reinsert != 0) |
0d62e5e8 DJ |
4227 | { |
4228 | if (debug_threads) | |
87ce2a04 DE |
4229 | debug_printf (" pending reinsert at 0x%s\n", |
4230 | paddress (lwp->bp_reinsert)); | |
d50171e4 | 4231 | |
85e00e85 | 4232 | if (can_hardware_single_step ()) |
d50171e4 | 4233 | { |
229d26fc | 4234 | if (fast_tp_collecting == fast_tpoint_collect_result::not_collecting) |
fa593d66 PA |
4235 | { |
4236 | if (step == 0) | |
9986ba08 | 4237 | warning ("BAD - reinserting but not stepping."); |
fa593d66 | 4238 | if (lwp->suspended) |
9986ba08 PA |
4239 | warning ("BAD - reinserting and suspended(%d).", |
4240 | lwp->suspended); | |
fa593d66 | 4241 | } |
d50171e4 | 4242 | } |
f79b145d YQ |
4243 | |
4244 | step = maybe_hw_step (thread); | |
0d62e5e8 DJ |
4245 | } |
4246 | ||
229d26fc | 4247 | if (fast_tp_collecting == fast_tpoint_collect_result::before_insn) |
fa593d66 PA |
4248 | { |
4249 | if (debug_threads) | |
87ce2a04 DE |
4250 | debug_printf ("lwp %ld wants to get out of fast tracepoint jump pad" |
4251 | " (exit-jump-pad-bkpt)\n", | |
d86d4aaf | 4252 | lwpid_of (thread)); |
fa593d66 | 4253 | } |
229d26fc | 4254 | else if (fast_tp_collecting == fast_tpoint_collect_result::at_insn) |
fa593d66 PA |
4255 | { |
4256 | if (debug_threads) | |
87ce2a04 DE |
4257 | debug_printf ("lwp %ld wants to get out of fast tracepoint jump pad" |
4258 | " single-stepping\n", | |
d86d4aaf | 4259 | lwpid_of (thread)); |
fa593d66 PA |
4260 | |
4261 | if (can_hardware_single_step ()) | |
4262 | step = 1; | |
4263 | else | |
38e08fca GB |
4264 | { |
4265 | internal_error (__FILE__, __LINE__, | |
4266 | "moving out of jump pad single-stepping" | |
4267 | " not implemented on this target"); | |
4268 | } | |
fa593d66 PA |
4269 | } |
4270 | ||
219f2f23 PA |
4271 | /* If we have while-stepping actions in this thread set it stepping. |
4272 | If we have a signal to deliver, it may or may not be set to | |
4273 | SIG_IGN, we don't know. Assume so, and allow collecting | |
4274 | while-stepping into a signal handler. A possible smart thing to | |
4275 | do would be to set an internal breakpoint at the signal return | |
4276 | address, continue, and carry on catching this while-stepping | |
4277 | action only when that breakpoint is hit. A future | |
4278 | enhancement. */ | |
7fe5e27e | 4279 | if (thread->while_stepping != NULL) |
219f2f23 PA |
4280 | { |
4281 | if (debug_threads) | |
87ce2a04 | 4282 | debug_printf ("lwp %ld has a while-stepping action -> forcing step.\n", |
d86d4aaf | 4283 | lwpid_of (thread)); |
7fe5e27e AT |
4284 | |
4285 | step = single_step (lwp); | |
219f2f23 PA |
4286 | } |
4287 | ||
c06cbd92 | 4288 | if (proc->tdesc != NULL && the_low_target.get_pc != NULL) |
0d62e5e8 | 4289 | { |
0bfdf32f | 4290 | struct regcache *regcache = get_thread_regcache (current_thread, 1); |
582511be PA |
4291 | |
4292 | lwp->stop_pc = (*the_low_target.get_pc) (regcache); | |
4293 | ||
4294 | if (debug_threads) | |
4295 | { | |
4296 | debug_printf (" %s from pc 0x%lx\n", step ? "step" : "continue", | |
4297 | (long) lwp->stop_pc); | |
4298 | } | |
0d62e5e8 DJ |
4299 | } |
4300 | ||
35ac8b3e YQ |
4301 | /* If we have pending signals, consume one if it can be delivered to |
4302 | the inferior. */ | |
4303 | if (lwp->pending_signals != NULL && lwp_signal_can_be_delivered (lwp)) | |
0d62e5e8 DJ |
4304 | { |
4305 | struct pending_signals **p_sig; | |
4306 | ||
54a0b537 | 4307 | p_sig = &lwp->pending_signals; |
0d62e5e8 DJ |
4308 | while ((*p_sig)->prev != NULL) |
4309 | p_sig = &(*p_sig)->prev; | |
4310 | ||
4311 | signal = (*p_sig)->signal; | |
32ca6d61 | 4312 | if ((*p_sig)->info.si_signo != 0) |
d86d4aaf | 4313 | ptrace (PTRACE_SETSIGINFO, lwpid_of (thread), (PTRACE_TYPE_ARG3) 0, |
56f7af9c | 4314 | &(*p_sig)->info); |
32ca6d61 | 4315 | |
0d62e5e8 DJ |
4316 | free (*p_sig); |
4317 | *p_sig = NULL; | |
4318 | } | |
4319 | ||
94610ec4 YQ |
4320 | if (debug_threads) |
4321 | debug_printf ("Resuming lwp %ld (%s, signal %d, stop %s)\n", | |
4322 | lwpid_of (thread), step ? "step" : "continue", signal, | |
4323 | lwp->stop_expected ? "expected" : "not expected"); | |
4324 | ||
aa5ca48f DE |
4325 | if (the_low_target.prepare_to_resume != NULL) |
4326 | the_low_target.prepare_to_resume (lwp); | |
4327 | ||
d86d4aaf | 4328 | regcache_invalidate_thread (thread); |
da6d8c04 | 4329 | errno = 0; |
54a0b537 | 4330 | lwp->stepping = step; |
82075af2 JS |
4331 | if (step) |
4332 | ptrace_request = PTRACE_SINGLESTEP; | |
4333 | else if (gdb_catching_syscalls_p (lwp)) | |
4334 | ptrace_request = PTRACE_SYSCALL; | |
4335 | else | |
4336 | ptrace_request = PTRACE_CONT; | |
4337 | ptrace (ptrace_request, | |
4338 | lwpid_of (thread), | |
b8e1b30e | 4339 | (PTRACE_TYPE_ARG3) 0, |
14ce3065 DE |
4340 | /* Coerce to a uintptr_t first to avoid potential gcc warning |
4341 | of coercing an 8 byte integer to a 4 byte pointer. */ | |
b8e1b30e | 4342 | (PTRACE_TYPE_ARG4) (uintptr_t) signal); |
0d62e5e8 | 4343 | |
0bfdf32f | 4344 | current_thread = saved_thread; |
da6d8c04 | 4345 | if (errno) |
23f238d3 PA |
4346 | perror_with_name ("resuming thread"); |
4347 | ||
4348 | /* Successfully resumed. Clear state that no longer makes sense, | |
4349 | and mark the LWP as running. Must not do this before resuming | |
4350 | otherwise if that fails other code will be confused. E.g., we'd | |
4351 | later try to stop the LWP and hang forever waiting for a stop | |
4352 | status. Note that we must not throw after this is cleared, | |
4353 | otherwise handle_zombie_lwp_error would get confused. */ | |
4354 | lwp->stopped = 0; | |
4355 | lwp->stop_reason = TARGET_STOPPED_BY_NO_REASON; | |
4356 | } | |
4357 | ||
4358 | /* Called when we try to resume a stopped LWP and that errors out. If | |
4359 | the LWP is no longer in ptrace-stopped state (meaning it's zombie, | |
4360 | or about to become), discard the error, clear any pending status | |
4361 | the LWP may have, and return true (we'll collect the exit status | |
4362 | soon enough). Otherwise, return false. */ | |
4363 | ||
4364 | static int | |
4365 | check_ptrace_stopped_lwp_gone (struct lwp_info *lp) | |
4366 | { | |
4367 | struct thread_info *thread = get_lwp_thread (lp); | |
4368 | ||
4369 | /* If we get an error after resuming the LWP successfully, we'd | |
4370 | confuse !T state for the LWP being gone. */ | |
4371 | gdb_assert (lp->stopped); | |
4372 | ||
4373 | /* We can't just check whether the LWP is in 'Z (Zombie)' state, | |
4374 | because even if ptrace failed with ESRCH, the tracee may be "not | |
4375 | yet fully dead", but already refusing ptrace requests. In that | |
4376 | case the tracee has 'R (Running)' state for a little bit | |
4377 | (observed in Linux 3.18). See also the note on ESRCH in the | |
4378 | ptrace(2) man page. Instead, check whether the LWP has any state | |
4379 | other than ptrace-stopped. */ | |
4380 | ||
4381 | /* Don't assume anything if /proc/PID/status can't be read. */ | |
4382 | if (linux_proc_pid_is_trace_stopped_nowarn (lwpid_of (thread)) == 0) | |
3221518c | 4383 | { |
23f238d3 PA |
4384 | lp->stop_reason = TARGET_STOPPED_BY_NO_REASON; |
4385 | lp->status_pending_p = 0; | |
4386 | return 1; | |
4387 | } | |
4388 | return 0; | |
4389 | } | |
4390 | ||
df95181f TBA |
4391 | void |
4392 | linux_process_target::resume_one_lwp (lwp_info *lwp, int step, int signal, | |
4393 | siginfo_t *info) | |
23f238d3 | 4394 | { |
a70b8144 | 4395 | try |
23f238d3 | 4396 | { |
df95181f | 4397 | resume_one_lwp_throw (lwp, step, signal, info); |
23f238d3 | 4398 | } |
230d2906 | 4399 | catch (const gdb_exception_error &ex) |
23f238d3 PA |
4400 | { |
4401 | if (!check_ptrace_stopped_lwp_gone (lwp)) | |
eedc3f4f | 4402 | throw; |
3221518c | 4403 | } |
da6d8c04 DJ |
4404 | } |
4405 | ||
5fdda392 SM |
4406 | /* This function is called once per thread via for_each_thread. |
4407 | We look up which resume request applies to THREAD and mark it with a | |
4408 | pointer to the appropriate resume request. | |
5544ad89 DJ |
4409 | |
4410 | This algorithm is O(threads * resume elements), but resume elements | |
4411 | is small (and will remain small at least until GDB supports thread | |
4412 | suspension). */ | |
ebcf782c | 4413 | |
5fdda392 SM |
4414 | static void |
4415 | linux_set_resume_request (thread_info *thread, thread_resume *resume, size_t n) | |
0d62e5e8 | 4416 | { |
d86d4aaf | 4417 | struct lwp_info *lwp = get_thread_lwp (thread); |
64386c31 | 4418 | |
5fdda392 | 4419 | for (int ndx = 0; ndx < n; ndx++) |
95954743 | 4420 | { |
5fdda392 | 4421 | ptid_t ptid = resume[ndx].thread; |
d7e15655 | 4422 | if (ptid == minus_one_ptid |
9c80ecd6 | 4423 | || ptid == thread->id |
0c9070b3 YQ |
4424 | /* Handle both 'pPID' and 'pPID.-1' as meaning 'all threads |
4425 | of PID'. */ | |
e99b03dc | 4426 | || (ptid.pid () == pid_of (thread) |
0e998d96 | 4427 | && (ptid.is_pid () |
e38504b3 | 4428 | || ptid.lwp () == -1))) |
95954743 | 4429 | { |
5fdda392 | 4430 | if (resume[ndx].kind == resume_stop |
8336d594 | 4431 | && thread->last_resume_kind == resume_stop) |
d50171e4 PA |
4432 | { |
4433 | if (debug_threads) | |
87ce2a04 DE |
4434 | debug_printf ("already %s LWP %ld at GDB's request\n", |
4435 | (thread->last_status.kind | |
4436 | == TARGET_WAITKIND_STOPPED) | |
4437 | ? "stopped" | |
4438 | : "stopping", | |
d86d4aaf | 4439 | lwpid_of (thread)); |
d50171e4 PA |
4440 | |
4441 | continue; | |
4442 | } | |
4443 | ||
5a04c4cf PA |
4444 | /* Ignore (wildcard) resume requests for already-resumed |
4445 | threads. */ | |
5fdda392 | 4446 | if (resume[ndx].kind != resume_stop |
5a04c4cf PA |
4447 | && thread->last_resume_kind != resume_stop) |
4448 | { | |
4449 | if (debug_threads) | |
4450 | debug_printf ("already %s LWP %ld at GDB's request\n", | |
4451 | (thread->last_resume_kind | |
4452 | == resume_step) | |
4453 | ? "stepping" | |
4454 | : "continuing", | |
4455 | lwpid_of (thread)); | |
4456 | continue; | |
4457 | } | |
4458 | ||
4459 | /* Don't let wildcard resumes resume fork children that GDB | |
4460 | does not yet know are new fork children. */ | |
4461 | if (lwp->fork_relative != NULL) | |
4462 | { | |
5a04c4cf PA |
4463 | struct lwp_info *rel = lwp->fork_relative; |
4464 | ||
4465 | if (rel->status_pending_p | |
4466 | && (rel->waitstatus.kind == TARGET_WAITKIND_FORKED | |
4467 | || rel->waitstatus.kind == TARGET_WAITKIND_VFORKED)) | |
4468 | { | |
4469 | if (debug_threads) | |
4470 | debug_printf ("not resuming LWP %ld: has queued stop reply\n", | |
4471 | lwpid_of (thread)); | |
4472 | continue; | |
4473 | } | |
4474 | } | |
4475 | ||
4476 | /* If the thread has a pending event that has already been | |
4477 | reported to GDBserver core, but GDB has not pulled the | |
4478 | event out of the vStopped queue yet, likewise, ignore the | |
4479 | (wildcard) resume request. */ | |
9c80ecd6 | 4480 | if (in_queued_stop_replies (thread->id)) |
5a04c4cf PA |
4481 | { |
4482 | if (debug_threads) | |
4483 | debug_printf ("not resuming LWP %ld: has queued stop reply\n", | |
4484 | lwpid_of (thread)); | |
4485 | continue; | |
4486 | } | |
4487 | ||
5fdda392 | 4488 | lwp->resume = &resume[ndx]; |
8336d594 | 4489 | thread->last_resume_kind = lwp->resume->kind; |
fa593d66 | 4490 | |
c2d6af84 PA |
4491 | lwp->step_range_start = lwp->resume->step_range_start; |
4492 | lwp->step_range_end = lwp->resume->step_range_end; | |
4493 | ||
fa593d66 PA |
4494 | /* If we had a deferred signal to report, dequeue one now. |
4495 | This can happen if LWP gets more than one signal while | |
4496 | trying to get out of a jump pad. */ | |
4497 | if (lwp->stopped | |
4498 | && !lwp->status_pending_p | |
4499 | && dequeue_one_deferred_signal (lwp, &lwp->status_pending)) | |
4500 | { | |
4501 | lwp->status_pending_p = 1; | |
4502 | ||
4503 | if (debug_threads) | |
87ce2a04 DE |
4504 | debug_printf ("Dequeueing deferred signal %d for LWP %ld, " |
4505 | "leaving status pending.\n", | |
d86d4aaf DE |
4506 | WSTOPSIG (lwp->status_pending), |
4507 | lwpid_of (thread)); | |
fa593d66 PA |
4508 | } |
4509 | ||
5fdda392 | 4510 | return; |
95954743 PA |
4511 | } |
4512 | } | |
2bd7c093 PA |
4513 | |
4514 | /* No resume action for this thread. */ | |
4515 | lwp->resume = NULL; | |
5544ad89 DJ |
4516 | } |
4517 | ||
df95181f TBA |
4518 | bool |
4519 | linux_process_target::resume_status_pending (thread_info *thread) | |
5544ad89 | 4520 | { |
d86d4aaf | 4521 | struct lwp_info *lwp = get_thread_lwp (thread); |
5544ad89 | 4522 | |
bd99dc85 PA |
4523 | /* LWPs which will not be resumed are not interesting, because |
4524 | we might not wait for them next time through linux_wait. */ | |
2bd7c093 | 4525 | if (lwp->resume == NULL) |
25c28b4d | 4526 | return false; |
64386c31 | 4527 | |
df95181f | 4528 | return thread_still_has_status_pending (thread); |
d50171e4 PA |
4529 | } |
4530 | ||
df95181f TBA |
4531 | bool |
4532 | linux_process_target::thread_needs_step_over (thread_info *thread) | |
d50171e4 | 4533 | { |
d86d4aaf | 4534 | struct lwp_info *lwp = get_thread_lwp (thread); |
0bfdf32f | 4535 | struct thread_info *saved_thread; |
d50171e4 | 4536 | CORE_ADDR pc; |
c06cbd92 YQ |
4537 | struct process_info *proc = get_thread_process (thread); |
4538 | ||
4539 | /* GDBserver is skipping the extra traps from the wrapper program, | |
4540 | don't have to do step over. */ | |
4541 | if (proc->tdesc == NULL) | |
eca55aec | 4542 | return false; |
d50171e4 PA |
4543 | |
4544 | /* LWPs which will not be resumed are not interesting, because we | |
4545 | might not wait for them next time through linux_wait. */ | |
4546 | ||
4547 | if (!lwp->stopped) | |
4548 | { | |
4549 | if (debug_threads) | |
87ce2a04 | 4550 | debug_printf ("Need step over [LWP %ld]? Ignoring, not stopped\n", |
d86d4aaf | 4551 | lwpid_of (thread)); |
eca55aec | 4552 | return false; |
d50171e4 PA |
4553 | } |
4554 | ||
8336d594 | 4555 | if (thread->last_resume_kind == resume_stop) |
d50171e4 PA |
4556 | { |
4557 | if (debug_threads) | |
87ce2a04 DE |
4558 | debug_printf ("Need step over [LWP %ld]? Ignoring, should remain" |
4559 | " stopped\n", | |
d86d4aaf | 4560 | lwpid_of (thread)); |
eca55aec | 4561 | return false; |
d50171e4 PA |
4562 | } |
4563 | ||
7984d532 PA |
4564 | gdb_assert (lwp->suspended >= 0); |
4565 | ||
4566 | if (lwp->suspended) | |
4567 | { | |
4568 | if (debug_threads) | |
87ce2a04 | 4569 | debug_printf ("Need step over [LWP %ld]? Ignoring, suspended\n", |
d86d4aaf | 4570 | lwpid_of (thread)); |
eca55aec | 4571 | return false; |
7984d532 PA |
4572 | } |
4573 | ||
bd99dc85 | 4574 | if (lwp->status_pending_p) |
d50171e4 PA |
4575 | { |
4576 | if (debug_threads) | |
87ce2a04 DE |
4577 | debug_printf ("Need step over [LWP %ld]? Ignoring, has pending" |
4578 | " status.\n", | |
d86d4aaf | 4579 | lwpid_of (thread)); |
eca55aec | 4580 | return false; |
d50171e4 PA |
4581 | } |
4582 | ||
4583 | /* Note: PC, not STOP_PC. Either GDB has adjusted the PC already, | |
4584 | or we have. */ | |
4585 | pc = get_pc (lwp); | |
4586 | ||
4587 | /* If the PC has changed since we stopped, then don't do anything, | |
4588 | and let the breakpoint/tracepoint be hit. This happens if, for | |
4589 | instance, GDB handled the decr_pc_after_break subtraction itself, | |
4590 | GDB is OOL stepping this thread, or the user has issued a "jump" | |
4591 | command, or poked thread's registers herself. */ | |
4592 | if (pc != lwp->stop_pc) | |
4593 | { | |
4594 | if (debug_threads) | |
87ce2a04 DE |
4595 | debug_printf ("Need step over [LWP %ld]? Cancelling, PC was changed. " |
4596 | "Old stop_pc was 0x%s, PC is now 0x%s\n", | |
d86d4aaf DE |
4597 | lwpid_of (thread), |
4598 | paddress (lwp->stop_pc), paddress (pc)); | |
eca55aec | 4599 | return false; |
d50171e4 PA |
4600 | } |
4601 | ||
484b3c32 YQ |
4602 | /* On software single step target, resume the inferior with signal |
4603 | rather than stepping over. */ | |
4604 | if (can_software_single_step () | |
4605 | && lwp->pending_signals != NULL | |
4606 | && lwp_signal_can_be_delivered (lwp)) | |
4607 | { | |
4608 | if (debug_threads) | |
4609 | debug_printf ("Need step over [LWP %ld]? Ignoring, has pending" | |
4610 | " signals.\n", | |
4611 | lwpid_of (thread)); | |
4612 | ||
eca55aec | 4613 | return false; |
484b3c32 YQ |
4614 | } |
4615 | ||
0bfdf32f GB |
4616 | saved_thread = current_thread; |
4617 | current_thread = thread; | |
d50171e4 | 4618 | |
8b07ae33 | 4619 | /* We can only step over breakpoints we know about. */ |
fa593d66 | 4620 | if (breakpoint_here (pc) || fast_tracepoint_jump_here (pc)) |
d50171e4 | 4621 | { |
8b07ae33 | 4622 | /* Don't step over a breakpoint that GDB expects to hit |
9f3a5c85 LM |
4623 | though. If the condition is being evaluated on the target's side |
4624 | and it evaluate to false, step over this breakpoint as well. */ | |
4625 | if (gdb_breakpoint_here (pc) | |
d3ce09f5 SS |
4626 | && gdb_condition_true_at_breakpoint (pc) |
4627 | && gdb_no_commands_at_breakpoint (pc)) | |
8b07ae33 PA |
4628 | { |
4629 | if (debug_threads) | |
87ce2a04 DE |
4630 | debug_printf ("Need step over [LWP %ld]? yes, but found" |
4631 | " GDB breakpoint at 0x%s; skipping step over\n", | |
d86d4aaf | 4632 | lwpid_of (thread), paddress (pc)); |
d50171e4 | 4633 | |
0bfdf32f | 4634 | current_thread = saved_thread; |
eca55aec | 4635 | return false; |
8b07ae33 PA |
4636 | } |
4637 | else | |
4638 | { | |
4639 | if (debug_threads) | |
87ce2a04 DE |
4640 | debug_printf ("Need step over [LWP %ld]? yes, " |
4641 | "found breakpoint at 0x%s\n", | |
d86d4aaf | 4642 | lwpid_of (thread), paddress (pc)); |
d50171e4 | 4643 | |
8b07ae33 | 4644 | /* We've found an lwp that needs stepping over --- return 1 so |
8f86d7aa | 4645 | that find_thread stops looking. */ |
0bfdf32f | 4646 | current_thread = saved_thread; |
8b07ae33 | 4647 | |
eca55aec | 4648 | return true; |
8b07ae33 | 4649 | } |
d50171e4 PA |
4650 | } |
4651 | ||
0bfdf32f | 4652 | current_thread = saved_thread; |
d50171e4 PA |
4653 | |
4654 | if (debug_threads) | |
87ce2a04 DE |
4655 | debug_printf ("Need step over [LWP %ld]? No, no breakpoint found" |
4656 | " at 0x%s\n", | |
d86d4aaf | 4657 | lwpid_of (thread), paddress (pc)); |
c6ecbae5 | 4658 | |
eca55aec | 4659 | return false; |
5544ad89 DJ |
4660 | } |
4661 | ||
d16f3f6c TBA |
4662 | void |
4663 | linux_process_target::start_step_over (lwp_info *lwp) | |
d50171e4 | 4664 | { |
d86d4aaf | 4665 | struct thread_info *thread = get_lwp_thread (lwp); |
0bfdf32f | 4666 | struct thread_info *saved_thread; |
d50171e4 PA |
4667 | CORE_ADDR pc; |
4668 | int step; | |
4669 | ||
4670 | if (debug_threads) | |
87ce2a04 | 4671 | debug_printf ("Starting step-over on LWP %ld. Stopping all threads\n", |
d86d4aaf | 4672 | lwpid_of (thread)); |
d50171e4 | 4673 | |
7984d532 | 4674 | stop_all_lwps (1, lwp); |
863d01bd PA |
4675 | |
4676 | if (lwp->suspended != 0) | |
4677 | { | |
4678 | internal_error (__FILE__, __LINE__, | |
4679 | "LWP %ld suspended=%d\n", lwpid_of (thread), | |
4680 | lwp->suspended); | |
4681 | } | |
d50171e4 PA |
4682 | |
4683 | if (debug_threads) | |
87ce2a04 | 4684 | debug_printf ("Done stopping all threads for step-over.\n"); |
d50171e4 PA |
4685 | |
4686 | /* Note, we should always reach here with an already adjusted PC, | |
4687 | either by GDB (if we're resuming due to GDB's request), or by our | |
4688 | caller, if we just finished handling an internal breakpoint GDB | |
4689 | shouldn't care about. */ | |
4690 | pc = get_pc (lwp); | |
4691 | ||
0bfdf32f GB |
4692 | saved_thread = current_thread; |
4693 | current_thread = thread; | |
d50171e4 PA |
4694 | |
4695 | lwp->bp_reinsert = pc; | |
4696 | uninsert_breakpoints_at (pc); | |
fa593d66 | 4697 | uninsert_fast_tracepoint_jumps_at (pc); |
d50171e4 | 4698 | |
7fe5e27e | 4699 | step = single_step (lwp); |
d50171e4 | 4700 | |
0bfdf32f | 4701 | current_thread = saved_thread; |
d50171e4 | 4702 | |
df95181f | 4703 | resume_one_lwp (lwp, step, 0, NULL); |
d50171e4 PA |
4704 | |
4705 | /* Require next event from this LWP. */ | |
9c80ecd6 | 4706 | step_over_bkpt = thread->id; |
d50171e4 PA |
4707 | } |
4708 | ||
4709 | /* Finish a step-over. Reinsert the breakpoint we had uninserted in | |
3b9a79ef | 4710 | start_step_over, if still there, and delete any single-step |
d50171e4 PA |
4711 | breakpoints we've set, on non hardware single-step targets. */ |
4712 | ||
4713 | static int | |
4714 | finish_step_over (struct lwp_info *lwp) | |
4715 | { | |
4716 | if (lwp->bp_reinsert != 0) | |
4717 | { | |
f79b145d YQ |
4718 | struct thread_info *saved_thread = current_thread; |
4719 | ||
d50171e4 | 4720 | if (debug_threads) |
87ce2a04 | 4721 | debug_printf ("Finished step over.\n"); |
d50171e4 | 4722 | |
f79b145d YQ |
4723 | current_thread = get_lwp_thread (lwp); |
4724 | ||
d50171e4 PA |
4725 | /* Reinsert any breakpoint at LWP->BP_REINSERT. Note that there |
4726 | may be no breakpoint to reinsert there by now. */ | |
4727 | reinsert_breakpoints_at (lwp->bp_reinsert); | |
fa593d66 | 4728 | reinsert_fast_tracepoint_jumps_at (lwp->bp_reinsert); |
d50171e4 PA |
4729 | |
4730 | lwp->bp_reinsert = 0; | |
4731 | ||
3b9a79ef YQ |
4732 | /* Delete any single-step breakpoints. No longer needed. We |
4733 | don't have to worry about other threads hitting this trap, | |
4734 | and later not being able to explain it, because we were | |
4735 | stepping over a breakpoint, and we hold all threads but | |
4736 | LWP stopped while doing that. */ | |
d50171e4 | 4737 | if (!can_hardware_single_step ()) |
f79b145d | 4738 | { |
3b9a79ef YQ |
4739 | gdb_assert (has_single_step_breakpoints (current_thread)); |
4740 | delete_single_step_breakpoints (current_thread); | |
f79b145d | 4741 | } |
d50171e4 PA |
4742 | |
4743 | step_over_bkpt = null_ptid; | |
f79b145d | 4744 | current_thread = saved_thread; |
d50171e4 PA |
4745 | return 1; |
4746 | } | |
4747 | else | |
4748 | return 0; | |
4749 | } | |
4750 | ||
d16f3f6c TBA |
4751 | void |
4752 | linux_process_target::complete_ongoing_step_over () | |
863d01bd | 4753 | { |
d7e15655 | 4754 | if (step_over_bkpt != null_ptid) |
863d01bd PA |
4755 | { |
4756 | struct lwp_info *lwp; | |
4757 | int wstat; | |
4758 | int ret; | |
4759 | ||
4760 | if (debug_threads) | |
4761 | debug_printf ("detach: step over in progress, finish it first\n"); | |
4762 | ||
4763 | /* Passing NULL_PTID as filter indicates we want all events to | |
4764 | be left pending. Eventually this returns when there are no | |
4765 | unwaited-for children left. */ | |
d16f3f6c TBA |
4766 | ret = wait_for_event_filtered (minus_one_ptid, null_ptid, &wstat, |
4767 | __WALL); | |
863d01bd PA |
4768 | gdb_assert (ret == -1); |
4769 | ||
4770 | lwp = find_lwp_pid (step_over_bkpt); | |
4771 | if (lwp != NULL) | |
4772 | finish_step_over (lwp); | |
4773 | step_over_bkpt = null_ptid; | |
4774 | unsuspend_all_lwps (lwp); | |
4775 | } | |
4776 | } | |
4777 | ||
df95181f TBA |
4778 | void |
4779 | linux_process_target::resume_one_thread (thread_info *thread, | |
4780 | bool leave_all_stopped) | |
5544ad89 | 4781 | { |
d86d4aaf | 4782 | struct lwp_info *lwp = get_thread_lwp (thread); |
d50171e4 | 4783 | int leave_pending; |
5544ad89 | 4784 | |
2bd7c093 | 4785 | if (lwp->resume == NULL) |
c80825ff | 4786 | return; |
5544ad89 | 4787 | |
bd99dc85 | 4788 | if (lwp->resume->kind == resume_stop) |
5544ad89 | 4789 | { |
bd99dc85 | 4790 | if (debug_threads) |
d86d4aaf | 4791 | debug_printf ("resume_stop request for LWP %ld\n", lwpid_of (thread)); |
bd99dc85 PA |
4792 | |
4793 | if (!lwp->stopped) | |
4794 | { | |
4795 | if (debug_threads) | |
d86d4aaf | 4796 | debug_printf ("stopping LWP %ld\n", lwpid_of (thread)); |
bd99dc85 | 4797 | |
d50171e4 PA |
4798 | /* Stop the thread, and wait for the event asynchronously, |
4799 | through the event loop. */ | |
02fc4de7 | 4800 | send_sigstop (lwp); |
bd99dc85 PA |
4801 | } |
4802 | else | |
4803 | { | |
4804 | if (debug_threads) | |
87ce2a04 | 4805 | debug_printf ("already stopped LWP %ld\n", |
d86d4aaf | 4806 | lwpid_of (thread)); |
d50171e4 PA |
4807 | |
4808 | /* The LWP may have been stopped in an internal event that | |
4809 | was not meant to be notified back to GDB (e.g., gdbserver | |
4810 | breakpoint), so we should be reporting a stop event in | |
4811 | this case too. */ | |
4812 | ||
4813 | /* If the thread already has a pending SIGSTOP, this is a | |
4814 | no-op. Otherwise, something later will presumably resume | |
4815 | the thread and this will cause it to cancel any pending | |
4816 | operation, due to last_resume_kind == resume_stop. If | |
4817 | the thread already has a pending status to report, we | |
4818 | will still report it the next time we wait - see | |
4819 | status_pending_p_callback. */ | |
1a981360 PA |
4820 | |
4821 | /* If we already have a pending signal to report, then | |
4822 | there's no need to queue a SIGSTOP, as this means we're | |
4823 | midway through moving the LWP out of the jumppad, and we | |
4824 | will report the pending signal as soon as that is | |
4825 | finished. */ | |
4826 | if (lwp->pending_signals_to_report == NULL) | |
4827 | send_sigstop (lwp); | |
bd99dc85 | 4828 | } |
32ca6d61 | 4829 | |
bd99dc85 PA |
4830 | /* For stop requests, we're done. */ |
4831 | lwp->resume = NULL; | |
fc7238bb | 4832 | thread->last_status.kind = TARGET_WAITKIND_IGNORE; |
c80825ff | 4833 | return; |
5544ad89 DJ |
4834 | } |
4835 | ||
bd99dc85 | 4836 | /* If this thread which is about to be resumed has a pending status, |
863d01bd PA |
4837 | then don't resume it - we can just report the pending status. |
4838 | Likewise if it is suspended, because e.g., another thread is | |
4839 | stepping past a breakpoint. Make sure to queue any signals that | |
4840 | would otherwise be sent. In all-stop mode, we do this decision | |
4841 | based on if *any* thread has a pending status. If there's a | |
4842 | thread that needs the step-over-breakpoint dance, then don't | |
4843 | resume any other thread but that particular one. */ | |
4844 | leave_pending = (lwp->suspended | |
4845 | || lwp->status_pending_p | |
4846 | || leave_all_stopped); | |
5544ad89 | 4847 | |
0e9a339e YQ |
4848 | /* If we have a new signal, enqueue the signal. */ |
4849 | if (lwp->resume->sig != 0) | |
4850 | { | |
4851 | siginfo_t info, *info_p; | |
4852 | ||
4853 | /* If this is the same signal we were previously stopped by, | |
4854 | make sure to queue its siginfo. */ | |
4855 | if (WIFSTOPPED (lwp->last_status) | |
4856 | && WSTOPSIG (lwp->last_status) == lwp->resume->sig | |
4857 | && ptrace (PTRACE_GETSIGINFO, lwpid_of (thread), | |
4858 | (PTRACE_TYPE_ARG3) 0, &info) == 0) | |
4859 | info_p = &info; | |
4860 | else | |
4861 | info_p = NULL; | |
4862 | ||
4863 | enqueue_pending_signal (lwp, lwp->resume->sig, info_p); | |
4864 | } | |
4865 | ||
d50171e4 | 4866 | if (!leave_pending) |
bd99dc85 PA |
4867 | { |
4868 | if (debug_threads) | |
d86d4aaf | 4869 | debug_printf ("resuming LWP %ld\n", lwpid_of (thread)); |
5544ad89 | 4870 | |
9c80ecd6 | 4871 | proceed_one_lwp (thread, NULL); |
bd99dc85 PA |
4872 | } |
4873 | else | |
4874 | { | |
4875 | if (debug_threads) | |
d86d4aaf | 4876 | debug_printf ("leaving LWP %ld stopped\n", lwpid_of (thread)); |
bd99dc85 | 4877 | } |
5544ad89 | 4878 | |
fc7238bb | 4879 | thread->last_status.kind = TARGET_WAITKIND_IGNORE; |
bd99dc85 | 4880 | lwp->resume = NULL; |
0d62e5e8 DJ |
4881 | } |
4882 | ||
0e4d7e35 TBA |
4883 | void |
4884 | linux_process_target::resume (thread_resume *resume_info, size_t n) | |
0d62e5e8 | 4885 | { |
d86d4aaf | 4886 | struct thread_info *need_step_over = NULL; |
c6ecbae5 | 4887 | |
87ce2a04 DE |
4888 | if (debug_threads) |
4889 | { | |
4890 | debug_enter (); | |
4891 | debug_printf ("linux_resume:\n"); | |
4892 | } | |
4893 | ||
5fdda392 SM |
4894 | for_each_thread ([&] (thread_info *thread) |
4895 | { | |
4896 | linux_set_resume_request (thread, resume_info, n); | |
4897 | }); | |
5544ad89 | 4898 | |
d50171e4 PA |
4899 | /* If there is a thread which would otherwise be resumed, which has |
4900 | a pending status, then don't resume any threads - we can just | |
4901 | report the pending status. Make sure to queue any signals that | |
4902 | would otherwise be sent. In non-stop mode, we'll apply this | |
4903 | logic to each thread individually. We consume all pending events | |
4904 | before considering to start a step-over (in all-stop). */ | |
25c28b4d | 4905 | bool any_pending = false; |
bd99dc85 | 4906 | if (!non_stop) |
df95181f TBA |
4907 | any_pending = find_thread ([this] (thread_info *thread) |
4908 | { | |
4909 | return resume_status_pending (thread); | |
4910 | }) != nullptr; | |
d50171e4 PA |
4911 | |
4912 | /* If there is a thread which would otherwise be resumed, which is | |
4913 | stopped at a breakpoint that needs stepping over, then don't | |
4914 | resume any threads - have it step over the breakpoint with all | |
4915 | other threads stopped, then resume all threads again. Make sure | |
4916 | to queue any signals that would otherwise be delivered or | |
4917 | queued. */ | |
4918 | if (!any_pending && supports_breakpoints ()) | |
df95181f TBA |
4919 | need_step_over = find_thread ([this] (thread_info *thread) |
4920 | { | |
4921 | return thread_needs_step_over (thread); | |
4922 | }); | |
d50171e4 | 4923 | |
c80825ff | 4924 | bool leave_all_stopped = (need_step_over != NULL || any_pending); |
d50171e4 PA |
4925 | |
4926 | if (debug_threads) | |
4927 | { | |
4928 | if (need_step_over != NULL) | |
87ce2a04 | 4929 | debug_printf ("Not resuming all, need step over\n"); |
d50171e4 | 4930 | else if (any_pending) |
87ce2a04 DE |
4931 | debug_printf ("Not resuming, all-stop and found " |
4932 | "an LWP with pending status\n"); | |
d50171e4 | 4933 | else |
87ce2a04 | 4934 | debug_printf ("Resuming, no pending status or step over needed\n"); |
d50171e4 PA |
4935 | } |
4936 | ||
4937 | /* Even if we're leaving threads stopped, queue all signals we'd | |
4938 | otherwise deliver. */ | |
c80825ff SM |
4939 | for_each_thread ([&] (thread_info *thread) |
4940 | { | |
df95181f | 4941 | resume_one_thread (thread, leave_all_stopped); |
c80825ff | 4942 | }); |
d50171e4 PA |
4943 | |
4944 | if (need_step_over) | |
d86d4aaf | 4945 | start_step_over (get_thread_lwp (need_step_over)); |
87ce2a04 DE |
4946 | |
4947 | if (debug_threads) | |
4948 | { | |
4949 | debug_printf ("linux_resume done\n"); | |
4950 | debug_exit (); | |
4951 | } | |
1bebeeca PA |
4952 | |
4953 | /* We may have events that were pending that can/should be sent to | |
4954 | the client now. Trigger a linux_wait call. */ | |
4955 | if (target_is_async_p ()) | |
4956 | async_file_mark (); | |
d50171e4 PA |
4957 | } |
4958 | ||
df95181f TBA |
4959 | void |
4960 | linux_process_target::proceed_one_lwp (thread_info *thread, lwp_info *except) | |
d50171e4 | 4961 | { |
d86d4aaf | 4962 | struct lwp_info *lwp = get_thread_lwp (thread); |
d50171e4 PA |
4963 | int step; |
4964 | ||
7984d532 | 4965 | if (lwp == except) |
e2b44075 | 4966 | return; |
d50171e4 PA |
4967 | |
4968 | if (debug_threads) | |
d86d4aaf | 4969 | debug_printf ("proceed_one_lwp: lwp %ld\n", lwpid_of (thread)); |
d50171e4 PA |
4970 | |
4971 | if (!lwp->stopped) | |
4972 | { | |
4973 | if (debug_threads) | |
d86d4aaf | 4974 | debug_printf (" LWP %ld already running\n", lwpid_of (thread)); |
e2b44075 | 4975 | return; |
d50171e4 PA |
4976 | } |
4977 | ||
02fc4de7 PA |
4978 | if (thread->last_resume_kind == resume_stop |
4979 | && thread->last_status.kind != TARGET_WAITKIND_IGNORE) | |
d50171e4 PA |
4980 | { |
4981 | if (debug_threads) | |
87ce2a04 | 4982 | debug_printf (" client wants LWP to remain %ld stopped\n", |
d86d4aaf | 4983 | lwpid_of (thread)); |
e2b44075 | 4984 | return; |
d50171e4 PA |
4985 | } |
4986 | ||
4987 | if (lwp->status_pending_p) | |
4988 | { | |
4989 | if (debug_threads) | |
87ce2a04 | 4990 | debug_printf (" LWP %ld has pending status, leaving stopped\n", |
d86d4aaf | 4991 | lwpid_of (thread)); |
e2b44075 | 4992 | return; |
d50171e4 PA |
4993 | } |
4994 | ||
7984d532 PA |
4995 | gdb_assert (lwp->suspended >= 0); |
4996 | ||
d50171e4 PA |
4997 | if (lwp->suspended) |
4998 | { | |
4999 | if (debug_threads) | |
d86d4aaf | 5000 | debug_printf (" LWP %ld is suspended\n", lwpid_of (thread)); |
e2b44075 | 5001 | return; |
d50171e4 PA |
5002 | } |
5003 | ||
1a981360 PA |
5004 | if (thread->last_resume_kind == resume_stop |
5005 | && lwp->pending_signals_to_report == NULL | |
229d26fc SM |
5006 | && (lwp->collecting_fast_tracepoint |
5007 | == fast_tpoint_collect_result::not_collecting)) | |
02fc4de7 PA |
5008 | { |
5009 | /* We haven't reported this LWP as stopped yet (otherwise, the | |
5010 | last_status.kind check above would catch it, and we wouldn't | |
5011 | reach here. This LWP may have been momentarily paused by a | |
5012 | stop_all_lwps call while handling for example, another LWP's | |
5013 | step-over. In that case, the pending expected SIGSTOP signal | |
5014 | that was queued at vCont;t handling time will have already | |
5015 | been consumed by wait_for_sigstop, and so we need to requeue | |
5016 | another one here. Note that if the LWP already has a SIGSTOP | |
5017 | pending, this is a no-op. */ | |
5018 | ||
5019 | if (debug_threads) | |
87ce2a04 DE |
5020 | debug_printf ("Client wants LWP %ld to stop. " |
5021 | "Making sure it has a SIGSTOP pending\n", | |
d86d4aaf | 5022 | lwpid_of (thread)); |
02fc4de7 PA |
5023 | |
5024 | send_sigstop (lwp); | |
5025 | } | |
5026 | ||
863d01bd PA |
5027 | if (thread->last_resume_kind == resume_step) |
5028 | { | |
5029 | if (debug_threads) | |
5030 | debug_printf (" stepping LWP %ld, client wants it stepping\n", | |
5031 | lwpid_of (thread)); | |
8901d193 | 5032 | |
3b9a79ef | 5033 | /* If resume_step is requested by GDB, install single-step |
8901d193 | 5034 | breakpoints when the thread is about to be actually resumed if |
3b9a79ef YQ |
5035 | the single-step breakpoints weren't removed. */ |
5036 | if (can_software_single_step () | |
5037 | && !has_single_step_breakpoints (thread)) | |
8901d193 YQ |
5038 | install_software_single_step_breakpoints (lwp); |
5039 | ||
5040 | step = maybe_hw_step (thread); | |
863d01bd PA |
5041 | } |
5042 | else if (lwp->bp_reinsert != 0) | |
5043 | { | |
5044 | if (debug_threads) | |
5045 | debug_printf (" stepping LWP %ld, reinsert set\n", | |
5046 | lwpid_of (thread)); | |
f79b145d YQ |
5047 | |
5048 | step = maybe_hw_step (thread); | |
863d01bd PA |
5049 | } |
5050 | else | |
5051 | step = 0; | |
5052 | ||
df95181f | 5053 | resume_one_lwp (lwp, step, 0, NULL); |
7984d532 PA |
5054 | } |
5055 | ||
df95181f TBA |
5056 | void |
5057 | linux_process_target::unsuspend_and_proceed_one_lwp (thread_info *thread, | |
5058 | lwp_info *except) | |
7984d532 | 5059 | { |
d86d4aaf | 5060 | struct lwp_info *lwp = get_thread_lwp (thread); |
7984d532 PA |
5061 | |
5062 | if (lwp == except) | |
e2b44075 | 5063 | return; |
7984d532 | 5064 | |
863d01bd | 5065 | lwp_suspended_decr (lwp); |
7984d532 | 5066 | |
e2b44075 | 5067 | proceed_one_lwp (thread, except); |
d50171e4 PA |
5068 | } |
5069 | ||
d16f3f6c TBA |
5070 | void |
5071 | linux_process_target::proceed_all_lwps () | |
d50171e4 | 5072 | { |
d86d4aaf | 5073 | struct thread_info *need_step_over; |
d50171e4 PA |
5074 | |
5075 | /* If there is a thread which would otherwise be resumed, which is | |
5076 | stopped at a breakpoint that needs stepping over, then don't | |
5077 | resume any threads - have it step over the breakpoint with all | |
5078 | other threads stopped, then resume all threads again. */ | |
5079 | ||
5080 | if (supports_breakpoints ()) | |
5081 | { | |
df95181f TBA |
5082 | need_step_over = find_thread ([this] (thread_info *thread) |
5083 | { | |
5084 | return thread_needs_step_over (thread); | |
5085 | }); | |
d50171e4 PA |
5086 | |
5087 | if (need_step_over != NULL) | |
5088 | { | |
5089 | if (debug_threads) | |
87ce2a04 DE |
5090 | debug_printf ("proceed_all_lwps: found " |
5091 | "thread %ld needing a step-over\n", | |
5092 | lwpid_of (need_step_over)); | |
d50171e4 | 5093 | |
d86d4aaf | 5094 | start_step_over (get_thread_lwp (need_step_over)); |
d50171e4 PA |
5095 | return; |
5096 | } | |
5097 | } | |
5544ad89 | 5098 | |
d50171e4 | 5099 | if (debug_threads) |
87ce2a04 | 5100 | debug_printf ("Proceeding, no step-over needed\n"); |
d50171e4 | 5101 | |
df95181f | 5102 | for_each_thread ([this] (thread_info *thread) |
e2b44075 SM |
5103 | { |
5104 | proceed_one_lwp (thread, NULL); | |
5105 | }); | |
d50171e4 PA |
5106 | } |
5107 | ||
d16f3f6c TBA |
5108 | void |
5109 | linux_process_target::unstop_all_lwps (int unsuspend, lwp_info *except) | |
d50171e4 | 5110 | { |
5544ad89 DJ |
5111 | if (debug_threads) |
5112 | { | |
87ce2a04 | 5113 | debug_enter (); |
d50171e4 | 5114 | if (except) |
87ce2a04 | 5115 | debug_printf ("unstopping all lwps, except=(LWP %ld)\n", |
d86d4aaf | 5116 | lwpid_of (get_lwp_thread (except))); |
5544ad89 | 5117 | else |
87ce2a04 | 5118 | debug_printf ("unstopping all lwps\n"); |
5544ad89 DJ |
5119 | } |
5120 | ||
7984d532 | 5121 | if (unsuspend) |
e2b44075 SM |
5122 | for_each_thread ([&] (thread_info *thread) |
5123 | { | |
5124 | unsuspend_and_proceed_one_lwp (thread, except); | |
5125 | }); | |
7984d532 | 5126 | else |
e2b44075 SM |
5127 | for_each_thread ([&] (thread_info *thread) |
5128 | { | |
5129 | proceed_one_lwp (thread, except); | |
5130 | }); | |
87ce2a04 DE |
5131 | |
5132 | if (debug_threads) | |
5133 | { | |
5134 | debug_printf ("unstop_all_lwps done\n"); | |
5135 | debug_exit (); | |
5136 | } | |
0d62e5e8 DJ |
5137 | } |
5138 | ||
58caa3dc DJ |
5139 | |
5140 | #ifdef HAVE_LINUX_REGSETS | |
5141 | ||
1faeff08 MR |
5142 | #define use_linux_regsets 1 |
5143 | ||
030031ee PA |
5144 | /* Returns true if REGSET has been disabled. */ |
5145 | ||
5146 | static int | |
5147 | regset_disabled (struct regsets_info *info, struct regset_info *regset) | |
5148 | { | |
5149 | return (info->disabled_regsets != NULL | |
5150 | && info->disabled_regsets[regset - info->regsets]); | |
5151 | } | |
5152 | ||
5153 | /* Disable REGSET. */ | |
5154 | ||
5155 | static void | |
5156 | disable_regset (struct regsets_info *info, struct regset_info *regset) | |
5157 | { | |
5158 | int dr_offset; | |
5159 | ||
5160 | dr_offset = regset - info->regsets; | |
5161 | if (info->disabled_regsets == NULL) | |
224c3ddb | 5162 | info->disabled_regsets = (char *) xcalloc (1, info->num_regsets); |
030031ee PA |
5163 | info->disabled_regsets[dr_offset] = 1; |
5164 | } | |
5165 | ||
58caa3dc | 5166 | static int |
3aee8918 PA |
5167 | regsets_fetch_inferior_registers (struct regsets_info *regsets_info, |
5168 | struct regcache *regcache) | |
58caa3dc DJ |
5169 | { |
5170 | struct regset_info *regset; | |
e9d25b98 | 5171 | int saw_general_regs = 0; |
95954743 | 5172 | int pid; |
1570b33e | 5173 | struct iovec iov; |
58caa3dc | 5174 | |
0bfdf32f | 5175 | pid = lwpid_of (current_thread); |
28eef672 | 5176 | for (regset = regsets_info->regsets; regset->size >= 0; regset++) |
58caa3dc | 5177 | { |
1570b33e L |
5178 | void *buf, *data; |
5179 | int nt_type, res; | |
58caa3dc | 5180 | |
030031ee | 5181 | if (regset->size == 0 || regset_disabled (regsets_info, regset)) |
28eef672 | 5182 | continue; |
58caa3dc | 5183 | |
bca929d3 | 5184 | buf = xmalloc (regset->size); |
1570b33e L |
5185 | |
5186 | nt_type = regset->nt_type; | |
5187 | if (nt_type) | |
5188 | { | |
5189 | iov.iov_base = buf; | |
5190 | iov.iov_len = regset->size; | |
5191 | data = (void *) &iov; | |
5192 | } | |
5193 | else | |
5194 | data = buf; | |
5195 | ||
dfb64f85 | 5196 | #ifndef __sparc__ |
f15f9948 | 5197 | res = ptrace (regset->get_request, pid, |
b8e1b30e | 5198 | (PTRACE_TYPE_ARG3) (long) nt_type, data); |
dfb64f85 | 5199 | #else |
1570b33e | 5200 | res = ptrace (regset->get_request, pid, data, nt_type); |
dfb64f85 | 5201 | #endif |
58caa3dc DJ |
5202 | if (res < 0) |
5203 | { | |
1ef53e6b AH |
5204 | if (errno == EIO |
5205 | || (errno == EINVAL && regset->type == OPTIONAL_REGS)) | |
58caa3dc | 5206 | { |
1ef53e6b AH |
5207 | /* If we get EIO on a regset, or an EINVAL and the regset is |
5208 | optional, do not try it again for this process mode. */ | |
030031ee | 5209 | disable_regset (regsets_info, regset); |
58caa3dc | 5210 | } |
e5a9158d AA |
5211 | else if (errno == ENODATA) |
5212 | { | |
5213 | /* ENODATA may be returned if the regset is currently | |
5214 | not "active". This can happen in normal operation, | |
5215 | so suppress the warning in this case. */ | |
5216 | } | |
fcd4a73d YQ |
5217 | else if (errno == ESRCH) |
5218 | { | |
5219 | /* At this point, ESRCH should mean the process is | |
5220 | already gone, in which case we simply ignore attempts | |
5221 | to read its registers. */ | |
5222 | } | |
58caa3dc DJ |
5223 | else |
5224 | { | |
0d62e5e8 | 5225 | char s[256]; |
95954743 PA |
5226 | sprintf (s, "ptrace(regsets_fetch_inferior_registers) PID=%d", |
5227 | pid); | |
0d62e5e8 | 5228 | perror (s); |
58caa3dc DJ |
5229 | } |
5230 | } | |
098dbe61 AA |
5231 | else |
5232 | { | |
5233 | if (regset->type == GENERAL_REGS) | |
5234 | saw_general_regs = 1; | |
5235 | regset->store_function (regcache, buf); | |
5236 | } | |
fdeb2a12 | 5237 | free (buf); |
58caa3dc | 5238 | } |
e9d25b98 DJ |
5239 | if (saw_general_regs) |
5240 | return 0; | |
5241 | else | |
5242 | return 1; | |
58caa3dc DJ |
5243 | } |
5244 | ||
5245 | static int | |
3aee8918 PA |
5246 | regsets_store_inferior_registers (struct regsets_info *regsets_info, |
5247 | struct regcache *regcache) | |
58caa3dc DJ |
5248 | { |
5249 | struct regset_info *regset; | |
e9d25b98 | 5250 | int saw_general_regs = 0; |
95954743 | 5251 | int pid; |
1570b33e | 5252 | struct iovec iov; |
58caa3dc | 5253 | |
0bfdf32f | 5254 | pid = lwpid_of (current_thread); |
28eef672 | 5255 | for (regset = regsets_info->regsets; regset->size >= 0; regset++) |
58caa3dc | 5256 | { |
1570b33e L |
5257 | void *buf, *data; |
5258 | int nt_type, res; | |
58caa3dc | 5259 | |
feea5f36 AA |
5260 | if (regset->size == 0 || regset_disabled (regsets_info, regset) |
5261 | || regset->fill_function == NULL) | |
28eef672 | 5262 | continue; |
58caa3dc | 5263 | |
bca929d3 | 5264 | buf = xmalloc (regset->size); |
545587ee DJ |
5265 | |
5266 | /* First fill the buffer with the current register set contents, | |
5267 | in case there are any items in the kernel's regset that are | |
5268 | not in gdbserver's regcache. */ | |
1570b33e L |
5269 | |
5270 | nt_type = regset->nt_type; | |
5271 | if (nt_type) | |
5272 | { | |
5273 | iov.iov_base = buf; | |
5274 | iov.iov_len = regset->size; | |
5275 | data = (void *) &iov; | |
5276 | } | |
5277 | else | |
5278 | data = buf; | |
5279 | ||
dfb64f85 | 5280 | #ifndef __sparc__ |
f15f9948 | 5281 | res = ptrace (regset->get_request, pid, |
b8e1b30e | 5282 | (PTRACE_TYPE_ARG3) (long) nt_type, data); |
dfb64f85 | 5283 | #else |
689cc2ae | 5284 | res = ptrace (regset->get_request, pid, data, nt_type); |
dfb64f85 | 5285 | #endif |
545587ee DJ |
5286 | |
5287 | if (res == 0) | |
5288 | { | |
5289 | /* Then overlay our cached registers on that. */ | |
442ea881 | 5290 | regset->fill_function (regcache, buf); |
545587ee DJ |
5291 | |
5292 | /* Only now do we write the register set. */ | |
dfb64f85 | 5293 | #ifndef __sparc__ |
f15f9948 | 5294 | res = ptrace (regset->set_request, pid, |
b8e1b30e | 5295 | (PTRACE_TYPE_ARG3) (long) nt_type, data); |
dfb64f85 | 5296 | #else |
1570b33e | 5297 | res = ptrace (regset->set_request, pid, data, nt_type); |
dfb64f85 | 5298 | #endif |
545587ee DJ |
5299 | } |
5300 | ||
58caa3dc DJ |
5301 | if (res < 0) |
5302 | { | |
1ef53e6b AH |
5303 | if (errno == EIO |
5304 | || (errno == EINVAL && regset->type == OPTIONAL_REGS)) | |
58caa3dc | 5305 | { |
1ef53e6b AH |
5306 | /* If we get EIO on a regset, or an EINVAL and the regset is |
5307 | optional, do not try it again for this process mode. */ | |
030031ee | 5308 | disable_regset (regsets_info, regset); |
58caa3dc | 5309 | } |
3221518c UW |
5310 | else if (errno == ESRCH) |
5311 | { | |
1b3f6016 PA |
5312 | /* At this point, ESRCH should mean the process is |
5313 | already gone, in which case we simply ignore attempts | |
5314 | to change its registers. See also the related | |
df95181f | 5315 | comment in resume_one_lwp. */ |
fdeb2a12 | 5316 | free (buf); |
3221518c UW |
5317 | return 0; |
5318 | } | |
58caa3dc DJ |
5319 | else |
5320 | { | |
ce3a066d | 5321 | perror ("Warning: ptrace(regsets_store_inferior_registers)"); |
58caa3dc DJ |
5322 | } |
5323 | } | |
e9d25b98 DJ |
5324 | else if (regset->type == GENERAL_REGS) |
5325 | saw_general_regs = 1; | |
09ec9b38 | 5326 | free (buf); |
58caa3dc | 5327 | } |
e9d25b98 DJ |
5328 | if (saw_general_regs) |
5329 | return 0; | |
5330 | else | |
5331 | return 1; | |
58caa3dc DJ |
5332 | } |
5333 | ||
1faeff08 | 5334 | #else /* !HAVE_LINUX_REGSETS */ |
58caa3dc | 5335 | |
1faeff08 | 5336 | #define use_linux_regsets 0 |
3aee8918 PA |
5337 | #define regsets_fetch_inferior_registers(regsets_info, regcache) 1 |
5338 | #define regsets_store_inferior_registers(regsets_info, regcache) 1 | |
58caa3dc | 5339 | |
58caa3dc | 5340 | #endif |
1faeff08 MR |
5341 | |
5342 | /* Return 1 if register REGNO is supported by one of the regset ptrace | |
5343 | calls or 0 if it has to be transferred individually. */ | |
5344 | ||
5345 | static int | |
3aee8918 | 5346 | linux_register_in_regsets (const struct regs_info *regs_info, int regno) |
1faeff08 MR |
5347 | { |
5348 | unsigned char mask = 1 << (regno % 8); | |
5349 | size_t index = regno / 8; | |
5350 | ||
5351 | return (use_linux_regsets | |
3aee8918 PA |
5352 | && (regs_info->regset_bitmap == NULL |
5353 | || (regs_info->regset_bitmap[index] & mask) != 0)); | |
1faeff08 MR |
5354 | } |
5355 | ||
58caa3dc | 5356 | #ifdef HAVE_LINUX_USRREGS |
1faeff08 | 5357 | |
5b3da067 | 5358 | static int |
3aee8918 | 5359 | register_addr (const struct usrregs_info *usrregs, int regnum) |
1faeff08 MR |
5360 | { |
5361 | int addr; | |
5362 | ||
3aee8918 | 5363 | if (regnum < 0 || regnum >= usrregs->num_regs) |
1faeff08 MR |
5364 | error ("Invalid register number %d.", regnum); |
5365 | ||
3aee8918 | 5366 | addr = usrregs->regmap[regnum]; |
1faeff08 MR |
5367 | |
5368 | return addr; | |
5369 | } | |
5370 | ||
daca57a7 TBA |
5371 | |
5372 | void | |
5373 | linux_process_target::fetch_register (const usrregs_info *usrregs, | |
5374 | regcache *regcache, int regno) | |
1faeff08 MR |
5375 | { |
5376 | CORE_ADDR regaddr; | |
5377 | int i, size; | |
5378 | char *buf; | |
5379 | int pid; | |
5380 | ||
3aee8918 | 5381 | if (regno >= usrregs->num_regs) |
1faeff08 | 5382 | return; |
daca57a7 | 5383 | if (low_cannot_fetch_register (regno)) |
1faeff08 MR |
5384 | return; |
5385 | ||
3aee8918 | 5386 | regaddr = register_addr (usrregs, regno); |
1faeff08 MR |
5387 | if (regaddr == -1) |
5388 | return; | |
5389 | ||
3aee8918 PA |
5390 | size = ((register_size (regcache->tdesc, regno) |
5391 | + sizeof (PTRACE_XFER_TYPE) - 1) | |
1faeff08 | 5392 | & -sizeof (PTRACE_XFER_TYPE)); |
224c3ddb | 5393 | buf = (char *) alloca (size); |
1faeff08 | 5394 | |
0bfdf32f | 5395 | pid = lwpid_of (current_thread); |
1faeff08 MR |
5396 | for (i = 0; i < size; i += sizeof (PTRACE_XFER_TYPE)) |
5397 | { | |
5398 | errno = 0; | |
5399 | *(PTRACE_XFER_TYPE *) (buf + i) = | |
5400 | ptrace (PTRACE_PEEKUSER, pid, | |
5401 | /* Coerce to a uintptr_t first to avoid potential gcc warning | |
5402 | of coercing an 8 byte integer to a 4 byte pointer. */ | |
b8e1b30e | 5403 | (PTRACE_TYPE_ARG3) (uintptr_t) regaddr, (PTRACE_TYPE_ARG4) 0); |
1faeff08 MR |
5404 | regaddr += sizeof (PTRACE_XFER_TYPE); |
5405 | if (errno != 0) | |
9a70f35c YQ |
5406 | { |
5407 | /* Mark register REGNO unavailable. */ | |
5408 | supply_register (regcache, regno, NULL); | |
5409 | return; | |
5410 | } | |
1faeff08 MR |
5411 | } |
5412 | ||
5413 | if (the_low_target.supply_ptrace_register) | |
5414 | the_low_target.supply_ptrace_register (regcache, regno, buf); | |
5415 | else | |
5416 | supply_register (regcache, regno, buf); | |
5417 | } | |
5418 | ||
daca57a7 TBA |
5419 | void |
5420 | linux_process_target::store_register (const usrregs_info *usrregs, | |
5421 | regcache *regcache, int regno) | |
1faeff08 MR |
5422 | { |
5423 | CORE_ADDR regaddr; | |
5424 | int i, size; | |
5425 | char *buf; | |
5426 | int pid; | |
5427 | ||
3aee8918 | 5428 | if (regno >= usrregs->num_regs) |
1faeff08 | 5429 | return; |
daca57a7 | 5430 | if (low_cannot_store_register (regno)) |
1faeff08 MR |
5431 | return; |
5432 | ||
3aee8918 | 5433 | regaddr = register_addr (usrregs, regno); |
1faeff08 MR |
5434 | if (regaddr == -1) |
5435 | return; | |
5436 | ||
3aee8918 PA |
5437 | size = ((register_size (regcache->tdesc, regno) |
5438 | + sizeof (PTRACE_XFER_TYPE) - 1) | |
1faeff08 | 5439 | & -sizeof (PTRACE_XFER_TYPE)); |
224c3ddb | 5440 | buf = (char *) alloca (size); |
1faeff08 MR |
5441 | memset (buf, 0, size); |
5442 | ||
5443 | if (the_low_target.collect_ptrace_register) | |
5444 | the_low_target.collect_ptrace_register (regcache, regno, buf); | |
5445 | else | |
5446 | collect_register (regcache, regno, buf); | |
5447 | ||
0bfdf32f | 5448 | pid = lwpid_of (current_thread); |
1faeff08 MR |
5449 | for (i = 0; i < size; i += sizeof (PTRACE_XFER_TYPE)) |
5450 | { | |
5451 | errno = 0; | |
5452 | ptrace (PTRACE_POKEUSER, pid, | |
5453 | /* Coerce to a uintptr_t first to avoid potential gcc warning | |
5454 | about coercing an 8 byte integer to a 4 byte pointer. */ | |
b8e1b30e LM |
5455 | (PTRACE_TYPE_ARG3) (uintptr_t) regaddr, |
5456 | (PTRACE_TYPE_ARG4) *(PTRACE_XFER_TYPE *) (buf + i)); | |
1faeff08 MR |
5457 | if (errno != 0) |
5458 | { | |
5459 | /* At this point, ESRCH should mean the process is | |
5460 | already gone, in which case we simply ignore attempts | |
5461 | to change its registers. See also the related | |
df95181f | 5462 | comment in resume_one_lwp. */ |
1faeff08 MR |
5463 | if (errno == ESRCH) |
5464 | return; | |
5465 | ||
daca57a7 TBA |
5466 | |
5467 | if (!low_cannot_store_register (regno)) | |
6d91ce9a | 5468 | error ("writing register %d: %s", regno, safe_strerror (errno)); |
1faeff08 MR |
5469 | } |
5470 | regaddr += sizeof (PTRACE_XFER_TYPE); | |
5471 | } | |
5472 | } | |
daca57a7 | 5473 | #endif /* HAVE_LINUX_USRREGS */ |
1faeff08 | 5474 | |
daca57a7 TBA |
5475 | void |
5476 | linux_process_target::usr_fetch_inferior_registers (const regs_info *regs_info, | |
5477 | regcache *regcache, | |
5478 | int regno, int all) | |
1faeff08 | 5479 | { |
daca57a7 | 5480 | #ifdef HAVE_LINUX_USRREGS |
3aee8918 PA |
5481 | struct usrregs_info *usr = regs_info->usrregs; |
5482 | ||
1faeff08 MR |
5483 | if (regno == -1) |
5484 | { | |
3aee8918 PA |
5485 | for (regno = 0; regno < usr->num_regs; regno++) |
5486 | if (all || !linux_register_in_regsets (regs_info, regno)) | |
5487 | fetch_register (usr, regcache, regno); | |
1faeff08 MR |
5488 | } |
5489 | else | |
3aee8918 | 5490 | fetch_register (usr, regcache, regno); |
daca57a7 | 5491 | #endif |
1faeff08 MR |
5492 | } |
5493 | ||
daca57a7 TBA |
5494 | void |
5495 | linux_process_target::usr_store_inferior_registers (const regs_info *regs_info, | |
5496 | regcache *regcache, | |
5497 | int regno, int all) | |
1faeff08 | 5498 | { |
daca57a7 | 5499 | #ifdef HAVE_LINUX_USRREGS |
3aee8918 PA |
5500 | struct usrregs_info *usr = regs_info->usrregs; |
5501 | ||
1faeff08 MR |
5502 | if (regno == -1) |
5503 | { | |
3aee8918 PA |
5504 | for (regno = 0; regno < usr->num_regs; regno++) |
5505 | if (all || !linux_register_in_regsets (regs_info, regno)) | |
5506 | store_register (usr, regcache, regno); | |
1faeff08 MR |
5507 | } |
5508 | else | |
3aee8918 | 5509 | store_register (usr, regcache, regno); |
58caa3dc | 5510 | #endif |
daca57a7 | 5511 | } |
1faeff08 | 5512 | |
a5a4d4cd TBA |
5513 | void |
5514 | linux_process_target::fetch_registers (regcache *regcache, int regno) | |
1faeff08 MR |
5515 | { |
5516 | int use_regsets; | |
5517 | int all = 0; | |
aa8d21c9 | 5518 | const regs_info *regs_info = get_regs_info (); |
1faeff08 MR |
5519 | |
5520 | if (regno == -1) | |
5521 | { | |
bd70b1f2 | 5522 | if (regs_info->usrregs != NULL) |
3aee8918 | 5523 | for (regno = 0; regno < regs_info->usrregs->num_regs; regno++) |
bd70b1f2 | 5524 | low_fetch_register (regcache, regno); |
c14dfd32 | 5525 | |
3aee8918 PA |
5526 | all = regsets_fetch_inferior_registers (regs_info->regsets_info, regcache); |
5527 | if (regs_info->usrregs != NULL) | |
5528 | usr_fetch_inferior_registers (regs_info, regcache, -1, all); | |
1faeff08 MR |
5529 | } |
5530 | else | |
5531 | { | |
bd70b1f2 | 5532 | if (low_fetch_register (regcache, regno)) |
c14dfd32 PA |
5533 | return; |
5534 | ||
3aee8918 | 5535 | use_regsets = linux_register_in_regsets (regs_info, regno); |
1faeff08 | 5536 | if (use_regsets) |
3aee8918 PA |
5537 | all = regsets_fetch_inferior_registers (regs_info->regsets_info, |
5538 | regcache); | |
5539 | if ((!use_regsets || all) && regs_info->usrregs != NULL) | |
5540 | usr_fetch_inferior_registers (regs_info, regcache, regno, 1); | |
1faeff08 | 5541 | } |
58caa3dc DJ |
5542 | } |
5543 | ||
a5a4d4cd TBA |
5544 | void |
5545 | linux_process_target::store_registers (regcache *regcache, int regno) | |
58caa3dc | 5546 | { |
1faeff08 MR |
5547 | int use_regsets; |
5548 | int all = 0; | |
aa8d21c9 | 5549 | const regs_info *regs_info = get_regs_info (); |
1faeff08 MR |
5550 | |
5551 | if (regno == -1) | |
5552 | { | |
3aee8918 PA |
5553 | all = regsets_store_inferior_registers (regs_info->regsets_info, |
5554 | regcache); | |
5555 | if (regs_info->usrregs != NULL) | |
5556 | usr_store_inferior_registers (regs_info, regcache, regno, all); | |
1faeff08 MR |
5557 | } |
5558 | else | |
5559 | { | |
3aee8918 | 5560 | use_regsets = linux_register_in_regsets (regs_info, regno); |
1faeff08 | 5561 | if (use_regsets) |
3aee8918 PA |
5562 | all = regsets_store_inferior_registers (regs_info->regsets_info, |
5563 | regcache); | |
5564 | if ((!use_regsets || all) && regs_info->usrregs != NULL) | |
5565 | usr_store_inferior_registers (regs_info, regcache, regno, 1); | |
1faeff08 | 5566 | } |
58caa3dc DJ |
5567 | } |
5568 | ||
bd70b1f2 TBA |
5569 | bool |
5570 | linux_process_target::low_fetch_register (regcache *regcache, int regno) | |
5571 | { | |
5572 | return false; | |
5573 | } | |
da6d8c04 | 5574 | |
e2558df3 | 5575 | /* A wrapper for the read_memory target op. */ |
da6d8c04 | 5576 | |
c3e735a6 | 5577 | static int |
f450004a | 5578 | linux_read_memory (CORE_ADDR memaddr, unsigned char *myaddr, int len) |
e2558df3 | 5579 | { |
52405d85 | 5580 | return the_target->read_memory (memaddr, myaddr, len); |
e2558df3 TBA |
5581 | } |
5582 | ||
5583 | /* Copy LEN bytes from inferior's memory starting at MEMADDR | |
5584 | to debugger memory starting at MYADDR. */ | |
5585 | ||
5586 | int | |
5587 | linux_process_target::read_memory (CORE_ADDR memaddr, | |
5588 | unsigned char *myaddr, int len) | |
da6d8c04 | 5589 | { |
0bfdf32f | 5590 | int pid = lwpid_of (current_thread); |
ae3e2ccf SM |
5591 | PTRACE_XFER_TYPE *buffer; |
5592 | CORE_ADDR addr; | |
5593 | int count; | |
4934b29e | 5594 | char filename[64]; |
ae3e2ccf | 5595 | int i; |
4934b29e | 5596 | int ret; |
fd462a61 | 5597 | int fd; |
fd462a61 DJ |
5598 | |
5599 | /* Try using /proc. Don't bother for one word. */ | |
5600 | if (len >= 3 * sizeof (long)) | |
5601 | { | |
4934b29e MR |
5602 | int bytes; |
5603 | ||
fd462a61 DJ |
5604 | /* We could keep this file open and cache it - possibly one per |
5605 | thread. That requires some juggling, but is even faster. */ | |
95954743 | 5606 | sprintf (filename, "/proc/%d/mem", pid); |
fd462a61 DJ |
5607 | fd = open (filename, O_RDONLY | O_LARGEFILE); |
5608 | if (fd == -1) | |
5609 | goto no_proc; | |
5610 | ||
5611 | /* If pread64 is available, use it. It's faster if the kernel | |
5612 | supports it (only one syscall), and it's 64-bit safe even on | |
5613 | 32-bit platforms (for instance, SPARC debugging a SPARC64 | |
5614 | application). */ | |
5615 | #ifdef HAVE_PREAD64 | |
4934b29e | 5616 | bytes = pread64 (fd, myaddr, len, memaddr); |
fd462a61 | 5617 | #else |
4934b29e MR |
5618 | bytes = -1; |
5619 | if (lseek (fd, memaddr, SEEK_SET) != -1) | |
5620 | bytes = read (fd, myaddr, len); | |
fd462a61 | 5621 | #endif |
fd462a61 DJ |
5622 | |
5623 | close (fd); | |
4934b29e MR |
5624 | if (bytes == len) |
5625 | return 0; | |
5626 | ||
5627 | /* Some data was read, we'll try to get the rest with ptrace. */ | |
5628 | if (bytes > 0) | |
5629 | { | |
5630 | memaddr += bytes; | |
5631 | myaddr += bytes; | |
5632 | len -= bytes; | |
5633 | } | |
fd462a61 | 5634 | } |
da6d8c04 | 5635 | |
fd462a61 | 5636 | no_proc: |
4934b29e MR |
5637 | /* Round starting address down to longword boundary. */ |
5638 | addr = memaddr & -(CORE_ADDR) sizeof (PTRACE_XFER_TYPE); | |
5639 | /* Round ending address up; get number of longwords that makes. */ | |
5640 | count = ((((memaddr + len) - addr) + sizeof (PTRACE_XFER_TYPE) - 1) | |
5641 | / sizeof (PTRACE_XFER_TYPE)); | |
5642 | /* Allocate buffer of that many longwords. */ | |
8d749320 | 5643 | buffer = XALLOCAVEC (PTRACE_XFER_TYPE, count); |
4934b29e | 5644 | |
da6d8c04 | 5645 | /* Read all the longwords */ |
4934b29e | 5646 | errno = 0; |
da6d8c04 DJ |
5647 | for (i = 0; i < count; i++, addr += sizeof (PTRACE_XFER_TYPE)) |
5648 | { | |
14ce3065 DE |
5649 | /* Coerce the 3rd arg to a uintptr_t first to avoid potential gcc warning |
5650 | about coercing an 8 byte integer to a 4 byte pointer. */ | |
5651 | buffer[i] = ptrace (PTRACE_PEEKTEXT, pid, | |
b8e1b30e LM |
5652 | (PTRACE_TYPE_ARG3) (uintptr_t) addr, |
5653 | (PTRACE_TYPE_ARG4) 0); | |
c3e735a6 | 5654 | if (errno) |
4934b29e | 5655 | break; |
da6d8c04 | 5656 | } |
4934b29e | 5657 | ret = errno; |
da6d8c04 DJ |
5658 | |
5659 | /* Copy appropriate bytes out of the buffer. */ | |
8d409d16 MR |
5660 | if (i > 0) |
5661 | { | |
5662 | i *= sizeof (PTRACE_XFER_TYPE); | |
5663 | i -= memaddr & (sizeof (PTRACE_XFER_TYPE) - 1); | |
5664 | memcpy (myaddr, | |
5665 | (char *) buffer + (memaddr & (sizeof (PTRACE_XFER_TYPE) - 1)), | |
5666 | i < len ? i : len); | |
5667 | } | |
c3e735a6 | 5668 | |
4934b29e | 5669 | return ret; |
da6d8c04 DJ |
5670 | } |
5671 | ||
93ae6fdc PA |
5672 | /* Copy LEN bytes of data from debugger memory at MYADDR to inferior's |
5673 | memory at MEMADDR. On failure (cannot write to the inferior) | |
f0ae6fc3 | 5674 | returns the value of errno. Always succeeds if LEN is zero. */ |
da6d8c04 | 5675 | |
e2558df3 TBA |
5676 | int |
5677 | linux_process_target::write_memory (CORE_ADDR memaddr, | |
5678 | const unsigned char *myaddr, int len) | |
da6d8c04 | 5679 | { |
ae3e2ccf | 5680 | int i; |
da6d8c04 | 5681 | /* Round starting address down to longword boundary. */ |
ae3e2ccf | 5682 | CORE_ADDR addr = memaddr & -(CORE_ADDR) sizeof (PTRACE_XFER_TYPE); |
da6d8c04 | 5683 | /* Round ending address up; get number of longwords that makes. */ |
ae3e2ccf | 5684 | int count |
493e2a69 MS |
5685 | = (((memaddr + len) - addr) + sizeof (PTRACE_XFER_TYPE) - 1) |
5686 | / sizeof (PTRACE_XFER_TYPE); | |
5687 | ||
da6d8c04 | 5688 | /* Allocate buffer of that many longwords. */ |
ae3e2ccf | 5689 | PTRACE_XFER_TYPE *buffer = XALLOCAVEC (PTRACE_XFER_TYPE, count); |
493e2a69 | 5690 | |
0bfdf32f | 5691 | int pid = lwpid_of (current_thread); |
da6d8c04 | 5692 | |
f0ae6fc3 PA |
5693 | if (len == 0) |
5694 | { | |
5695 | /* Zero length write always succeeds. */ | |
5696 | return 0; | |
5697 | } | |
5698 | ||
0d62e5e8 DJ |
5699 | if (debug_threads) |
5700 | { | |
58d6951d | 5701 | /* Dump up to four bytes. */ |
bf47e248 PA |
5702 | char str[4 * 2 + 1]; |
5703 | char *p = str; | |
5704 | int dump = len < 4 ? len : 4; | |
5705 | ||
5706 | for (i = 0; i < dump; i++) | |
5707 | { | |
5708 | sprintf (p, "%02x", myaddr[i]); | |
5709 | p += 2; | |
5710 | } | |
5711 | *p = '\0'; | |
5712 | ||
5713 | debug_printf ("Writing %s to 0x%08lx in process %d\n", | |
5714 | str, (long) memaddr, pid); | |
0d62e5e8 DJ |
5715 | } |
5716 | ||
da6d8c04 DJ |
5717 | /* Fill start and end extra bytes of buffer with existing memory data. */ |
5718 | ||
93ae6fdc | 5719 | errno = 0; |
14ce3065 DE |
5720 | /* Coerce the 3rd arg to a uintptr_t first to avoid potential gcc warning |
5721 | about coercing an 8 byte integer to a 4 byte pointer. */ | |
5722 | buffer[0] = ptrace (PTRACE_PEEKTEXT, pid, | |
b8e1b30e LM |
5723 | (PTRACE_TYPE_ARG3) (uintptr_t) addr, |
5724 | (PTRACE_TYPE_ARG4) 0); | |
93ae6fdc PA |
5725 | if (errno) |
5726 | return errno; | |
da6d8c04 DJ |
5727 | |
5728 | if (count > 1) | |
5729 | { | |
93ae6fdc | 5730 | errno = 0; |
da6d8c04 | 5731 | buffer[count - 1] |
95954743 | 5732 | = ptrace (PTRACE_PEEKTEXT, pid, |
14ce3065 DE |
5733 | /* Coerce to a uintptr_t first to avoid potential gcc warning |
5734 | about coercing an 8 byte integer to a 4 byte pointer. */ | |
b8e1b30e | 5735 | (PTRACE_TYPE_ARG3) (uintptr_t) (addr + (count - 1) |
14ce3065 | 5736 | * sizeof (PTRACE_XFER_TYPE)), |
b8e1b30e | 5737 | (PTRACE_TYPE_ARG4) 0); |
93ae6fdc PA |
5738 | if (errno) |
5739 | return errno; | |
da6d8c04 DJ |
5740 | } |
5741 | ||
93ae6fdc | 5742 | /* Copy data to be written over corresponding part of buffer. */ |
da6d8c04 | 5743 | |
493e2a69 MS |
5744 | memcpy ((char *) buffer + (memaddr & (sizeof (PTRACE_XFER_TYPE) - 1)), |
5745 | myaddr, len); | |
da6d8c04 DJ |
5746 | |
5747 | /* Write the entire buffer. */ | |
5748 | ||
5749 | for (i = 0; i < count; i++, addr += sizeof (PTRACE_XFER_TYPE)) | |
5750 | { | |
5751 | errno = 0; | |
14ce3065 DE |
5752 | ptrace (PTRACE_POKETEXT, pid, |
5753 | /* Coerce to a uintptr_t first to avoid potential gcc warning | |
5754 | about coercing an 8 byte integer to a 4 byte pointer. */ | |
b8e1b30e LM |
5755 | (PTRACE_TYPE_ARG3) (uintptr_t) addr, |
5756 | (PTRACE_TYPE_ARG4) buffer[i]); | |
da6d8c04 DJ |
5757 | if (errno) |
5758 | return errno; | |
5759 | } | |
5760 | ||
5761 | return 0; | |
5762 | } | |
2f2893d9 | 5763 | |
2a31c7aa TBA |
5764 | void |
5765 | linux_process_target::look_up_symbols () | |
2f2893d9 | 5766 | { |
0d62e5e8 | 5767 | #ifdef USE_THREAD_DB |
95954743 PA |
5768 | struct process_info *proc = current_process (); |
5769 | ||
fe978cb0 | 5770 | if (proc->priv->thread_db != NULL) |
0d62e5e8 DJ |
5771 | return; |
5772 | ||
9b4c5f87 | 5773 | thread_db_init (); |
0d62e5e8 DJ |
5774 | #endif |
5775 | } | |
5776 | ||
eb497a2a TBA |
5777 | void |
5778 | linux_process_target::request_interrupt () | |
e5379b03 | 5779 | { |
78708b7c PA |
5780 | /* Send a SIGINT to the process group. This acts just like the user |
5781 | typed a ^C on the controlling terminal. */ | |
eb497a2a | 5782 | ::kill (-signal_pid, SIGINT); |
e5379b03 DJ |
5783 | } |
5784 | ||
eac215cc TBA |
5785 | bool |
5786 | linux_process_target::supports_read_auxv () | |
5787 | { | |
5788 | return true; | |
5789 | } | |
5790 | ||
aa691b87 RM |
5791 | /* Copy LEN bytes from inferior's auxiliary vector starting at OFFSET |
5792 | to debugger memory starting at MYADDR. */ | |
5793 | ||
eac215cc TBA |
5794 | int |
5795 | linux_process_target::read_auxv (CORE_ADDR offset, unsigned char *myaddr, | |
5796 | unsigned int len) | |
aa691b87 RM |
5797 | { |
5798 | char filename[PATH_MAX]; | |
5799 | int fd, n; | |
0bfdf32f | 5800 | int pid = lwpid_of (current_thread); |
aa691b87 | 5801 | |
6cebaf6e | 5802 | xsnprintf (filename, sizeof filename, "/proc/%d/auxv", pid); |
aa691b87 RM |
5803 | |
5804 | fd = open (filename, O_RDONLY); | |
5805 | if (fd < 0) | |
5806 | return -1; | |
5807 | ||
5808 | if (offset != (CORE_ADDR) 0 | |
5809 | && lseek (fd, (off_t) offset, SEEK_SET) != (off_t) offset) | |
5810 | n = -1; | |
5811 | else | |
5812 | n = read (fd, myaddr, len); | |
5813 | ||
5814 | close (fd); | |
5815 | ||
5816 | return n; | |
5817 | } | |
5818 | ||
d993e290 PA |
5819 | /* These breakpoint and watchpoint related wrapper functions simply |
5820 | pass on the function call if the target has registered a | |
5821 | corresponding function. */ | |
e013ee27 | 5822 | |
a2b2297a TBA |
5823 | bool |
5824 | linux_process_target::supports_z_point_type (char z_type) | |
802e8e6d PA |
5825 | { |
5826 | return (the_low_target.supports_z_point_type != NULL | |
5827 | && the_low_target.supports_z_point_type (z_type)); | |
5828 | } | |
5829 | ||
7e0bde70 TBA |
5830 | int |
5831 | linux_process_target::insert_point (enum raw_bkpt_type type, CORE_ADDR addr, | |
5832 | int size, raw_breakpoint *bp) | |
e013ee27 | 5833 | { |
c8f4bfdd YQ |
5834 | if (type == raw_bkpt_type_sw) |
5835 | return insert_memory_breakpoint (bp); | |
5836 | else if (the_low_target.insert_point != NULL) | |
802e8e6d | 5837 | return the_low_target.insert_point (type, addr, size, bp); |
e013ee27 OF |
5838 | else |
5839 | /* Unsupported (see target.h). */ | |
5840 | return 1; | |
5841 | } | |
5842 | ||
7e0bde70 TBA |
5843 | int |
5844 | linux_process_target::remove_point (enum raw_bkpt_type type, CORE_ADDR addr, | |
5845 | int size, raw_breakpoint *bp) | |
e013ee27 | 5846 | { |
c8f4bfdd YQ |
5847 | if (type == raw_bkpt_type_sw) |
5848 | return remove_memory_breakpoint (bp); | |
5849 | else if (the_low_target.remove_point != NULL) | |
802e8e6d | 5850 | return the_low_target.remove_point (type, addr, size, bp); |
e013ee27 OF |
5851 | else |
5852 | /* Unsupported (see target.h). */ | |
5853 | return 1; | |
5854 | } | |
5855 | ||
84320c4e | 5856 | /* Implement the stopped_by_sw_breakpoint target_ops |
3e572f71 PA |
5857 | method. */ |
5858 | ||
84320c4e TBA |
5859 | bool |
5860 | linux_process_target::stopped_by_sw_breakpoint () | |
3e572f71 PA |
5861 | { |
5862 | struct lwp_info *lwp = get_thread_lwp (current_thread); | |
5863 | ||
5864 | return (lwp->stop_reason == TARGET_STOPPED_BY_SW_BREAKPOINT); | |
5865 | } | |
5866 | ||
84320c4e | 5867 | /* Implement the supports_stopped_by_sw_breakpoint target_ops |
3e572f71 PA |
5868 | method. */ |
5869 | ||
84320c4e TBA |
5870 | bool |
5871 | linux_process_target::supports_stopped_by_sw_breakpoint () | |
3e572f71 PA |
5872 | { |
5873 | return USE_SIGTRAP_SIGINFO; | |
5874 | } | |
5875 | ||
93fe88b2 | 5876 | /* Implement the stopped_by_hw_breakpoint target_ops |
3e572f71 PA |
5877 | method. */ |
5878 | ||
93fe88b2 TBA |
5879 | bool |
5880 | linux_process_target::stopped_by_hw_breakpoint () | |
3e572f71 PA |
5881 | { |
5882 | struct lwp_info *lwp = get_thread_lwp (current_thread); | |
5883 | ||
5884 | return (lwp->stop_reason == TARGET_STOPPED_BY_HW_BREAKPOINT); | |
5885 | } | |
5886 | ||
93fe88b2 | 5887 | /* Implement the supports_stopped_by_hw_breakpoint target_ops |
3e572f71 PA |
5888 | method. */ |
5889 | ||
93fe88b2 TBA |
5890 | bool |
5891 | linux_process_target::supports_stopped_by_hw_breakpoint () | |
3e572f71 PA |
5892 | { |
5893 | return USE_SIGTRAP_SIGINFO; | |
5894 | } | |
5895 | ||
70b90b91 | 5896 | /* Implement the supports_hardware_single_step target_ops method. */ |
45614f15 | 5897 | |
22aa6223 TBA |
5898 | bool |
5899 | linux_process_target::supports_hardware_single_step () | |
45614f15 | 5900 | { |
45614f15 YQ |
5901 | return can_hardware_single_step (); |
5902 | } | |
5903 | ||
5303a34f TBA |
5904 | bool |
5905 | linux_process_target::supports_software_single_step () | |
7d00775e AT |
5906 | { |
5907 | return can_software_single_step (); | |
5908 | } | |
5909 | ||
6eeb5c55 TBA |
5910 | bool |
5911 | linux_process_target::stopped_by_watchpoint () | |
e013ee27 | 5912 | { |
0bfdf32f | 5913 | struct lwp_info *lwp = get_thread_lwp (current_thread); |
c3adc08c | 5914 | |
15c66dd6 | 5915 | return lwp->stop_reason == TARGET_STOPPED_BY_WATCHPOINT; |
e013ee27 OF |
5916 | } |
5917 | ||
6eeb5c55 TBA |
5918 | CORE_ADDR |
5919 | linux_process_target::stopped_data_address () | |
e013ee27 | 5920 | { |
0bfdf32f | 5921 | struct lwp_info *lwp = get_thread_lwp (current_thread); |
c3adc08c PA |
5922 | |
5923 | return lwp->stopped_data_address; | |
e013ee27 OF |
5924 | } |
5925 | ||
db0dfaa0 LM |
5926 | /* This is only used for targets that define PT_TEXT_ADDR, |
5927 | PT_DATA_ADDR and PT_TEXT_END_ADDR. If those are not defined, supposedly | |
5928 | the target has different ways of acquiring this information, like | |
5929 | loadmaps. */ | |
52fb6437 | 5930 | |
5203ae1e TBA |
5931 | bool |
5932 | linux_process_target::supports_read_offsets () | |
5933 | { | |
5934 | #ifdef SUPPORTS_READ_OFFSETS | |
5935 | return true; | |
5936 | #else | |
5937 | return false; | |
5938 | #endif | |
5939 | } | |
5940 | ||
52fb6437 NS |
5941 | /* Under uClinux, programs are loaded at non-zero offsets, which we need |
5942 | to tell gdb about. */ | |
5943 | ||
5203ae1e TBA |
5944 | int |
5945 | linux_process_target::read_offsets (CORE_ADDR *text_p, CORE_ADDR *data_p) | |
52fb6437 | 5946 | { |
5203ae1e | 5947 | #ifdef SUPPORTS_READ_OFFSETS |
52fb6437 | 5948 | unsigned long text, text_end, data; |
62828379 | 5949 | int pid = lwpid_of (current_thread); |
52fb6437 NS |
5950 | |
5951 | errno = 0; | |
5952 | ||
b8e1b30e LM |
5953 | text = ptrace (PTRACE_PEEKUSER, pid, (PTRACE_TYPE_ARG3) PT_TEXT_ADDR, |
5954 | (PTRACE_TYPE_ARG4) 0); | |
5955 | text_end = ptrace (PTRACE_PEEKUSER, pid, (PTRACE_TYPE_ARG3) PT_TEXT_END_ADDR, | |
5956 | (PTRACE_TYPE_ARG4) 0); | |
5957 | data = ptrace (PTRACE_PEEKUSER, pid, (PTRACE_TYPE_ARG3) PT_DATA_ADDR, | |
5958 | (PTRACE_TYPE_ARG4) 0); | |
52fb6437 NS |
5959 | |
5960 | if (errno == 0) | |
5961 | { | |
5962 | /* Both text and data offsets produced at compile-time (and so | |
1b3f6016 PA |
5963 | used by gdb) are relative to the beginning of the program, |
5964 | with the data segment immediately following the text segment. | |
5965 | However, the actual runtime layout in memory may put the data | |
5966 | somewhere else, so when we send gdb a data base-address, we | |
5967 | use the real data base address and subtract the compile-time | |
5968 | data base-address from it (which is just the length of the | |
5969 | text segment). BSS immediately follows data in both | |
5970 | cases. */ | |
52fb6437 NS |
5971 | *text_p = text; |
5972 | *data_p = data - (text_end - text); | |
1b3f6016 | 5973 | |
52fb6437 NS |
5974 | return 1; |
5975 | } | |
5203ae1e TBA |
5976 | return 0; |
5977 | #else | |
5978 | gdb_assert_not_reached ("target op read_offsets not supported"); | |
52fb6437 | 5979 | #endif |
5203ae1e | 5980 | } |
52fb6437 | 5981 | |
6e3fd7e9 TBA |
5982 | bool |
5983 | linux_process_target::supports_get_tls_address () | |
5984 | { | |
5985 | #ifdef USE_THREAD_DB | |
5986 | return true; | |
5987 | #else | |
5988 | return false; | |
5989 | #endif | |
5990 | } | |
5991 | ||
5992 | int | |
5993 | linux_process_target::get_tls_address (thread_info *thread, | |
5994 | CORE_ADDR offset, | |
5995 | CORE_ADDR load_module, | |
5996 | CORE_ADDR *address) | |
5997 | { | |
5998 | #ifdef USE_THREAD_DB | |
5999 | return thread_db_get_tls_address (thread, offset, load_module, address); | |
6000 | #else | |
6001 | return -1; | |
6002 | #endif | |
6003 | } | |
6004 | ||
2d0795ee TBA |
6005 | bool |
6006 | linux_process_target::supports_qxfer_osdata () | |
6007 | { | |
6008 | return true; | |
6009 | } | |
6010 | ||
6011 | int | |
6012 | linux_process_target::qxfer_osdata (const char *annex, | |
6013 | unsigned char *readbuf, | |
6014 | unsigned const char *writebuf, | |
6015 | CORE_ADDR offset, int len) | |
07e059b5 | 6016 | { |
d26e3629 | 6017 | return linux_common_xfer_osdata (annex, readbuf, offset, len); |
07e059b5 VP |
6018 | } |
6019 | ||
d0722149 DE |
6020 | /* Convert a native/host siginfo object, into/from the siginfo in the |
6021 | layout of the inferiors' architecture. */ | |
6022 | ||
6023 | static void | |
8adce034 | 6024 | siginfo_fixup (siginfo_t *siginfo, gdb_byte *inf_siginfo, int direction) |
d0722149 DE |
6025 | { |
6026 | int done = 0; | |
6027 | ||
6028 | if (the_low_target.siginfo_fixup != NULL) | |
6029 | done = the_low_target.siginfo_fixup (siginfo, inf_siginfo, direction); | |
6030 | ||
6031 | /* If there was no callback, or the callback didn't do anything, | |
6032 | then just do a straight memcpy. */ | |
6033 | if (!done) | |
6034 | { | |
6035 | if (direction == 1) | |
a5362b9a | 6036 | memcpy (siginfo, inf_siginfo, sizeof (siginfo_t)); |
d0722149 | 6037 | else |
a5362b9a | 6038 | memcpy (inf_siginfo, siginfo, sizeof (siginfo_t)); |
d0722149 DE |
6039 | } |
6040 | } | |
6041 | ||
d7abedf7 TBA |
6042 | bool |
6043 | linux_process_target::supports_qxfer_siginfo () | |
6044 | { | |
6045 | return true; | |
6046 | } | |
6047 | ||
6048 | int | |
6049 | linux_process_target::qxfer_siginfo (const char *annex, | |
6050 | unsigned char *readbuf, | |
6051 | unsigned const char *writebuf, | |
6052 | CORE_ADDR offset, int len) | |
4aa995e1 | 6053 | { |
d0722149 | 6054 | int pid; |
a5362b9a | 6055 | siginfo_t siginfo; |
8adce034 | 6056 | gdb_byte inf_siginfo[sizeof (siginfo_t)]; |
4aa995e1 | 6057 | |
0bfdf32f | 6058 | if (current_thread == NULL) |
4aa995e1 PA |
6059 | return -1; |
6060 | ||
0bfdf32f | 6061 | pid = lwpid_of (current_thread); |
4aa995e1 PA |
6062 | |
6063 | if (debug_threads) | |
87ce2a04 DE |
6064 | debug_printf ("%s siginfo for lwp %d.\n", |
6065 | readbuf != NULL ? "Reading" : "Writing", | |
6066 | pid); | |
4aa995e1 | 6067 | |
0adea5f7 | 6068 | if (offset >= sizeof (siginfo)) |
4aa995e1 PA |
6069 | return -1; |
6070 | ||
b8e1b30e | 6071 | if (ptrace (PTRACE_GETSIGINFO, pid, (PTRACE_TYPE_ARG3) 0, &siginfo) != 0) |
4aa995e1 PA |
6072 | return -1; |
6073 | ||
d0722149 DE |
6074 | /* When GDBSERVER is built as a 64-bit application, ptrace writes into |
6075 | SIGINFO an object with 64-bit layout. Since debugging a 32-bit | |
6076 | inferior with a 64-bit GDBSERVER should look the same as debugging it | |
6077 | with a 32-bit GDBSERVER, we need to convert it. */ | |
6078 | siginfo_fixup (&siginfo, inf_siginfo, 0); | |
6079 | ||
4aa995e1 PA |
6080 | if (offset + len > sizeof (siginfo)) |
6081 | len = sizeof (siginfo) - offset; | |
6082 | ||
6083 | if (readbuf != NULL) | |
d0722149 | 6084 | memcpy (readbuf, inf_siginfo + offset, len); |
4aa995e1 PA |
6085 | else |
6086 | { | |
d0722149 DE |
6087 | memcpy (inf_siginfo + offset, writebuf, len); |
6088 | ||
6089 | /* Convert back to ptrace layout before flushing it out. */ | |
6090 | siginfo_fixup (&siginfo, inf_siginfo, 1); | |
6091 | ||
b8e1b30e | 6092 | if (ptrace (PTRACE_SETSIGINFO, pid, (PTRACE_TYPE_ARG3) 0, &siginfo) != 0) |
4aa995e1 PA |
6093 | return -1; |
6094 | } | |
6095 | ||
6096 | return len; | |
6097 | } | |
6098 | ||
bd99dc85 PA |
6099 | /* SIGCHLD handler that serves two purposes: In non-stop/async mode, |
6100 | so we notice when children change state; as the handler for the | |
6101 | sigsuspend in my_waitpid. */ | |
6102 | ||
6103 | static void | |
6104 | sigchld_handler (int signo) | |
6105 | { | |
6106 | int old_errno = errno; | |
6107 | ||
6108 | if (debug_threads) | |
e581f2b4 PA |
6109 | { |
6110 | do | |
6111 | { | |
a7e559cc AH |
6112 | /* Use the async signal safe debug function. */ |
6113 | if (debug_write ("sigchld_handler\n", | |
6114 | sizeof ("sigchld_handler\n") - 1) < 0) | |
e581f2b4 PA |
6115 | break; /* just ignore */ |
6116 | } while (0); | |
6117 | } | |
bd99dc85 PA |
6118 | |
6119 | if (target_is_async_p ()) | |
6120 | async_file_mark (); /* trigger a linux_wait */ | |
6121 | ||
6122 | errno = old_errno; | |
6123 | } | |
6124 | ||
0dc587d4 TBA |
6125 | bool |
6126 | linux_process_target::supports_non_stop () | |
bd99dc85 | 6127 | { |
0dc587d4 | 6128 | return true; |
bd99dc85 PA |
6129 | } |
6130 | ||
0dc587d4 TBA |
6131 | bool |
6132 | linux_process_target::async (bool enable) | |
bd99dc85 | 6133 | { |
0dc587d4 | 6134 | bool previous = target_is_async_p (); |
bd99dc85 | 6135 | |
8336d594 | 6136 | if (debug_threads) |
87ce2a04 DE |
6137 | debug_printf ("linux_async (%d), previous=%d\n", |
6138 | enable, previous); | |
8336d594 | 6139 | |
bd99dc85 PA |
6140 | if (previous != enable) |
6141 | { | |
6142 | sigset_t mask; | |
6143 | sigemptyset (&mask); | |
6144 | sigaddset (&mask, SIGCHLD); | |
6145 | ||
21987b9c | 6146 | gdb_sigmask (SIG_BLOCK, &mask, NULL); |
bd99dc85 PA |
6147 | |
6148 | if (enable) | |
6149 | { | |
6150 | if (pipe (linux_event_pipe) == -1) | |
aa96c426 GB |
6151 | { |
6152 | linux_event_pipe[0] = -1; | |
6153 | linux_event_pipe[1] = -1; | |
21987b9c | 6154 | gdb_sigmask (SIG_UNBLOCK, &mask, NULL); |
aa96c426 GB |
6155 | |
6156 | warning ("creating event pipe failed."); | |
6157 | return previous; | |
6158 | } | |
bd99dc85 PA |
6159 | |
6160 | fcntl (linux_event_pipe[0], F_SETFL, O_NONBLOCK); | |
6161 | fcntl (linux_event_pipe[1], F_SETFL, O_NONBLOCK); | |
6162 | ||
6163 | /* Register the event loop handler. */ | |
6164 | add_file_handler (linux_event_pipe[0], | |
6165 | handle_target_event, NULL); | |
6166 | ||
6167 | /* Always trigger a linux_wait. */ | |
6168 | async_file_mark (); | |
6169 | } | |
6170 | else | |
6171 | { | |
6172 | delete_file_handler (linux_event_pipe[0]); | |
6173 | ||
6174 | close (linux_event_pipe[0]); | |
6175 | close (linux_event_pipe[1]); | |
6176 | linux_event_pipe[0] = -1; | |
6177 | linux_event_pipe[1] = -1; | |
6178 | } | |
6179 | ||
21987b9c | 6180 | gdb_sigmask (SIG_UNBLOCK, &mask, NULL); |
bd99dc85 PA |
6181 | } |
6182 | ||
6183 | return previous; | |
6184 | } | |
6185 | ||
0dc587d4 TBA |
6186 | int |
6187 | linux_process_target::start_non_stop (bool nonstop) | |
bd99dc85 PA |
6188 | { |
6189 | /* Register or unregister from event-loop accordingly. */ | |
0dc587d4 | 6190 | target_async (nonstop); |
aa96c426 | 6191 | |
0dc587d4 | 6192 | if (target_is_async_p () != (nonstop != false)) |
aa96c426 GB |
6193 | return -1; |
6194 | ||
bd99dc85 PA |
6195 | return 0; |
6196 | } | |
6197 | ||
652aef77 TBA |
6198 | bool |
6199 | linux_process_target::supports_multi_process () | |
cf8fd78b | 6200 | { |
652aef77 | 6201 | return true; |
cf8fd78b PA |
6202 | } |
6203 | ||
89245bc0 DB |
6204 | /* Check if fork events are supported. */ |
6205 | ||
9690a72a TBA |
6206 | bool |
6207 | linux_process_target::supports_fork_events () | |
89245bc0 DB |
6208 | { |
6209 | return linux_supports_tracefork (); | |
6210 | } | |
6211 | ||
6212 | /* Check if vfork events are supported. */ | |
6213 | ||
9690a72a TBA |
6214 | bool |
6215 | linux_process_target::supports_vfork_events () | |
89245bc0 DB |
6216 | { |
6217 | return linux_supports_tracefork (); | |
6218 | } | |
6219 | ||
94585166 DB |
6220 | /* Check if exec events are supported. */ |
6221 | ||
9690a72a TBA |
6222 | bool |
6223 | linux_process_target::supports_exec_events () | |
94585166 DB |
6224 | { |
6225 | return linux_supports_traceexec (); | |
6226 | } | |
6227 | ||
de0d863e DB |
6228 | /* Target hook for 'handle_new_gdb_connection'. Causes a reset of the |
6229 | ptrace flags for all inferiors. This is in case the new GDB connection | |
6230 | doesn't support the same set of events that the previous one did. */ | |
6231 | ||
fb00dfce TBA |
6232 | void |
6233 | linux_process_target::handle_new_gdb_connection () | |
de0d863e | 6234 | { |
de0d863e | 6235 | /* Request that all the lwps reset their ptrace options. */ |
bbf550d5 SM |
6236 | for_each_thread ([] (thread_info *thread) |
6237 | { | |
6238 | struct lwp_info *lwp = get_thread_lwp (thread); | |
6239 | ||
6240 | if (!lwp->stopped) | |
6241 | { | |
6242 | /* Stop the lwp so we can modify its ptrace options. */ | |
6243 | lwp->must_set_ptrace_flags = 1; | |
6244 | linux_stop_lwp (lwp); | |
6245 | } | |
6246 | else | |
6247 | { | |
6248 | /* Already stopped; go ahead and set the ptrace options. */ | |
6249 | struct process_info *proc = find_process_pid (pid_of (thread)); | |
6250 | int options = linux_low_ptrace_options (proc->attached); | |
6251 | ||
6252 | linux_enable_event_reporting (lwpid_of (thread), options); | |
6253 | lwp->must_set_ptrace_flags = 0; | |
6254 | } | |
6255 | }); | |
de0d863e DB |
6256 | } |
6257 | ||
55cf3021 TBA |
6258 | int |
6259 | linux_process_target::handle_monitor_command (char *mon) | |
6260 | { | |
6261 | #ifdef USE_THREAD_DB | |
6262 | return thread_db_handle_monitor_command (mon); | |
6263 | #else | |
6264 | return 0; | |
6265 | #endif | |
6266 | } | |
6267 | ||
95a45fc1 TBA |
6268 | int |
6269 | linux_process_target::core_of_thread (ptid_t ptid) | |
6270 | { | |
6271 | return linux_common_core_of_thread (ptid); | |
6272 | } | |
6273 | ||
c756403b TBA |
6274 | bool |
6275 | linux_process_target::supports_disable_randomization () | |
03583c20 UW |
6276 | { |
6277 | #ifdef HAVE_PERSONALITY | |
c756403b | 6278 | return true; |
03583c20 | 6279 | #else |
c756403b | 6280 | return false; |
03583c20 UW |
6281 | #endif |
6282 | } | |
efcbbd14 | 6283 | |
c0245cb9 TBA |
6284 | bool |
6285 | linux_process_target::supports_agent () | |
d1feda86 | 6286 | { |
c0245cb9 | 6287 | return true; |
d1feda86 YQ |
6288 | } |
6289 | ||
2526e0cd TBA |
6290 | bool |
6291 | linux_process_target::supports_range_stepping () | |
c2d6af84 | 6292 | { |
c3805894 | 6293 | if (can_software_single_step ()) |
2526e0cd | 6294 | return true; |
c2d6af84 | 6295 | if (*the_low_target.supports_range_stepping == NULL) |
2526e0cd | 6296 | return false; |
c2d6af84 PA |
6297 | |
6298 | return (*the_low_target.supports_range_stepping) (); | |
6299 | } | |
6300 | ||
8247b823 TBA |
6301 | bool |
6302 | linux_process_target::supports_pid_to_exec_file () | |
6303 | { | |
6304 | return true; | |
6305 | } | |
6306 | ||
6307 | char * | |
6308 | linux_process_target::pid_to_exec_file (int pid) | |
6309 | { | |
6310 | return linux_proc_pid_to_exec_file (pid); | |
6311 | } | |
6312 | ||
c9b7b804 TBA |
6313 | bool |
6314 | linux_process_target::supports_multifs () | |
6315 | { | |
6316 | return true; | |
6317 | } | |
6318 | ||
6319 | int | |
6320 | linux_process_target::multifs_open (int pid, const char *filename, | |
6321 | int flags, mode_t mode) | |
6322 | { | |
6323 | return linux_mntns_open_cloexec (pid, filename, flags, mode); | |
6324 | } | |
6325 | ||
6326 | int | |
6327 | linux_process_target::multifs_unlink (int pid, const char *filename) | |
6328 | { | |
6329 | return linux_mntns_unlink (pid, filename); | |
6330 | } | |
6331 | ||
6332 | ssize_t | |
6333 | linux_process_target::multifs_readlink (int pid, const char *filename, | |
6334 | char *buf, size_t bufsiz) | |
6335 | { | |
6336 | return linux_mntns_readlink (pid, filename, buf, bufsiz); | |
6337 | } | |
6338 | ||
723b724b | 6339 | #if defined PT_GETDSBT || defined PTRACE_GETFDPIC |
78d85199 YQ |
6340 | struct target_loadseg |
6341 | { | |
6342 | /* Core address to which the segment is mapped. */ | |
6343 | Elf32_Addr addr; | |
6344 | /* VMA recorded in the program header. */ | |
6345 | Elf32_Addr p_vaddr; | |
6346 | /* Size of this segment in memory. */ | |
6347 | Elf32_Word p_memsz; | |
6348 | }; | |
6349 | ||
723b724b | 6350 | # if defined PT_GETDSBT |
78d85199 YQ |
6351 | struct target_loadmap |
6352 | { | |
6353 | /* Protocol version number, must be zero. */ | |
6354 | Elf32_Word version; | |
6355 | /* Pointer to the DSBT table, its size, and the DSBT index. */ | |
6356 | unsigned *dsbt_table; | |
6357 | unsigned dsbt_size, dsbt_index; | |
6358 | /* Number of segments in this map. */ | |
6359 | Elf32_Word nsegs; | |
6360 | /* The actual memory map. */ | |
6361 | struct target_loadseg segs[/*nsegs*/]; | |
6362 | }; | |
723b724b MF |
6363 | # define LINUX_LOADMAP PT_GETDSBT |
6364 | # define LINUX_LOADMAP_EXEC PTRACE_GETDSBT_EXEC | |
6365 | # define LINUX_LOADMAP_INTERP PTRACE_GETDSBT_INTERP | |
6366 | # else | |
6367 | struct target_loadmap | |
6368 | { | |
6369 | /* Protocol version number, must be zero. */ | |
6370 | Elf32_Half version; | |
6371 | /* Number of segments in this map. */ | |
6372 | Elf32_Half nsegs; | |
6373 | /* The actual memory map. */ | |
6374 | struct target_loadseg segs[/*nsegs*/]; | |
6375 | }; | |
6376 | # define LINUX_LOADMAP PTRACE_GETFDPIC | |
6377 | # define LINUX_LOADMAP_EXEC PTRACE_GETFDPIC_EXEC | |
6378 | # define LINUX_LOADMAP_INTERP PTRACE_GETFDPIC_INTERP | |
6379 | # endif | |
78d85199 | 6380 | |
9da41fda TBA |
6381 | bool |
6382 | linux_process_target::supports_read_loadmap () | |
6383 | { | |
6384 | return true; | |
6385 | } | |
6386 | ||
6387 | int | |
6388 | linux_process_target::read_loadmap (const char *annex, CORE_ADDR offset, | |
6389 | unsigned char *myaddr, unsigned int len) | |
78d85199 | 6390 | { |
0bfdf32f | 6391 | int pid = lwpid_of (current_thread); |
78d85199 YQ |
6392 | int addr = -1; |
6393 | struct target_loadmap *data = NULL; | |
6394 | unsigned int actual_length, copy_length; | |
6395 | ||
6396 | if (strcmp (annex, "exec") == 0) | |
723b724b | 6397 | addr = (int) LINUX_LOADMAP_EXEC; |
78d85199 | 6398 | else if (strcmp (annex, "interp") == 0) |
723b724b | 6399 | addr = (int) LINUX_LOADMAP_INTERP; |
78d85199 YQ |
6400 | else |
6401 | return -1; | |
6402 | ||
723b724b | 6403 | if (ptrace (LINUX_LOADMAP, pid, addr, &data) != 0) |
78d85199 YQ |
6404 | return -1; |
6405 | ||
6406 | if (data == NULL) | |
6407 | return -1; | |
6408 | ||
6409 | actual_length = sizeof (struct target_loadmap) | |
6410 | + sizeof (struct target_loadseg) * data->nsegs; | |
6411 | ||
6412 | if (offset < 0 || offset > actual_length) | |
6413 | return -1; | |
6414 | ||
6415 | copy_length = actual_length - offset < len ? actual_length - offset : len; | |
6416 | memcpy (myaddr, (char *) data + offset, copy_length); | |
6417 | return copy_length; | |
6418 | } | |
723b724b | 6419 | #endif /* defined PT_GETDSBT || defined PTRACE_GETFDPIC */ |
78d85199 | 6420 | |
0df28b1b TBA |
6421 | void |
6422 | linux_process_target::process_qsupported (char **features, int count) | |
1570b33e L |
6423 | { |
6424 | if (the_low_target.process_qsupported != NULL) | |
06e03fff | 6425 | the_low_target.process_qsupported (features, count); |
1570b33e L |
6426 | } |
6427 | ||
bc8d3ae4 TBA |
6428 | bool |
6429 | linux_process_target::supports_catch_syscall () | |
82075af2 JS |
6430 | { |
6431 | return (the_low_target.get_syscall_trapinfo != NULL | |
6432 | && linux_supports_tracesysgood ()); | |
6433 | } | |
6434 | ||
d633e831 TBA |
6435 | int |
6436 | linux_process_target::get_ipa_tdesc_idx () | |
ae91f625 MK |
6437 | { |
6438 | if (the_low_target.get_ipa_tdesc_idx == NULL) | |
6439 | return 0; | |
6440 | ||
6441 | return (*the_low_target.get_ipa_tdesc_idx) (); | |
6442 | } | |
6443 | ||
290732bf TBA |
6444 | bool |
6445 | linux_process_target::supports_tracepoints () | |
219f2f23 PA |
6446 | { |
6447 | if (*the_low_target.supports_tracepoints == NULL) | |
290732bf | 6448 | return false; |
219f2f23 PA |
6449 | |
6450 | return (*the_low_target.supports_tracepoints) (); | |
6451 | } | |
6452 | ||
770d8f6a TBA |
6453 | CORE_ADDR |
6454 | linux_process_target::read_pc (regcache *regcache) | |
219f2f23 PA |
6455 | { |
6456 | if (the_low_target.get_pc == NULL) | |
6457 | return 0; | |
6458 | ||
6459 | return (*the_low_target.get_pc) (regcache); | |
6460 | } | |
6461 | ||
770d8f6a TBA |
6462 | void |
6463 | linux_process_target::write_pc (regcache *regcache, CORE_ADDR pc) | |
219f2f23 PA |
6464 | { |
6465 | gdb_assert (the_low_target.set_pc != NULL); | |
6466 | ||
6467 | (*the_low_target.set_pc) (regcache, pc); | |
6468 | } | |
6469 | ||
68119632 TBA |
6470 | bool |
6471 | linux_process_target::supports_thread_stopped () | |
6472 | { | |
6473 | return true; | |
6474 | } | |
6475 | ||
6476 | bool | |
6477 | linux_process_target::thread_stopped (thread_info *thread) | |
8336d594 PA |
6478 | { |
6479 | return get_thread_lwp (thread)->stopped; | |
6480 | } | |
6481 | ||
6482 | /* This exposes stop-all-threads functionality to other modules. */ | |
6483 | ||
29e8dc09 TBA |
6484 | void |
6485 | linux_process_target::pause_all (bool freeze) | |
8336d594 | 6486 | { |
7984d532 PA |
6487 | stop_all_lwps (freeze, NULL); |
6488 | } | |
6489 | ||
6490 | /* This exposes unstop-all-threads functionality to other gdbserver | |
6491 | modules. */ | |
6492 | ||
29e8dc09 TBA |
6493 | void |
6494 | linux_process_target::unpause_all (bool unfreeze) | |
7984d532 PA |
6495 | { |
6496 | unstop_all_lwps (unfreeze, NULL); | |
8336d594 PA |
6497 | } |
6498 | ||
79b44087 TBA |
6499 | int |
6500 | linux_process_target::prepare_to_access_memory () | |
90d74c30 PA |
6501 | { |
6502 | /* Neither ptrace nor /proc/PID/mem allow accessing memory through a | |
6503 | running LWP. */ | |
6504 | if (non_stop) | |
29e8dc09 | 6505 | target_pause_all (true); |
90d74c30 PA |
6506 | return 0; |
6507 | } | |
6508 | ||
79b44087 TBA |
6509 | void |
6510 | linux_process_target::done_accessing_memory () | |
90d74c30 PA |
6511 | { |
6512 | /* Neither ptrace nor /proc/PID/mem allow accessing memory through a | |
6513 | running LWP. */ | |
6514 | if (non_stop) | |
29e8dc09 | 6515 | target_unpause_all (true); |
90d74c30 PA |
6516 | } |
6517 | ||
c23c9391 TBA |
6518 | bool |
6519 | linux_process_target::supports_fast_tracepoints () | |
6520 | { | |
6521 | return the_low_target.install_fast_tracepoint_jump_pad != nullptr; | |
6522 | } | |
6523 | ||
6524 | int | |
6525 | linux_process_target::install_fast_tracepoint_jump_pad | |
6526 | (CORE_ADDR tpoint, CORE_ADDR tpaddr, CORE_ADDR collector, | |
6527 | CORE_ADDR lockaddr, ULONGEST orig_size, CORE_ADDR *jump_entry, | |
6528 | CORE_ADDR *trampoline, ULONGEST *trampoline_size, | |
6529 | unsigned char *jjump_pad_insn, ULONGEST *jjump_pad_insn_size, | |
6530 | CORE_ADDR *adjusted_insn_addr, CORE_ADDR *adjusted_insn_addr_end, | |
6531 | char *err) | |
fa593d66 PA |
6532 | { |
6533 | return (*the_low_target.install_fast_tracepoint_jump_pad) | |
6534 | (tpoint, tpaddr, collector, lockaddr, orig_size, | |
405f8e94 SS |
6535 | jump_entry, trampoline, trampoline_size, |
6536 | jjump_pad_insn, jjump_pad_insn_size, | |
6537 | adjusted_insn_addr, adjusted_insn_addr_end, | |
6538 | err); | |
fa593d66 PA |
6539 | } |
6540 | ||
345dafad TBA |
6541 | emit_ops * |
6542 | linux_process_target::emit_ops () | |
6a271cae PA |
6543 | { |
6544 | if (the_low_target.emit_ops != NULL) | |
6545 | return (*the_low_target.emit_ops) (); | |
6546 | else | |
6547 | return NULL; | |
6548 | } | |
6549 | ||
c23c9391 TBA |
6550 | int |
6551 | linux_process_target::get_min_fast_tracepoint_insn_len () | |
405f8e94 SS |
6552 | { |
6553 | return (*the_low_target.get_min_fast_tracepoint_insn_len) (); | |
6554 | } | |
6555 | ||
2268b414 JK |
6556 | /* Extract &phdr and num_phdr in the inferior. Return 0 on success. */ |
6557 | ||
6558 | static int | |
6559 | get_phdr_phnum_from_proc_auxv (const int pid, const int is_elf64, | |
6560 | CORE_ADDR *phdr_memaddr, int *num_phdr) | |
6561 | { | |
6562 | char filename[PATH_MAX]; | |
6563 | int fd; | |
6564 | const int auxv_size = is_elf64 | |
6565 | ? sizeof (Elf64_auxv_t) : sizeof (Elf32_auxv_t); | |
6566 | char buf[sizeof (Elf64_auxv_t)]; /* The larger of the two. */ | |
6567 | ||
6568 | xsnprintf (filename, sizeof filename, "/proc/%d/auxv", pid); | |
6569 | ||
6570 | fd = open (filename, O_RDONLY); | |
6571 | if (fd < 0) | |
6572 | return 1; | |
6573 | ||
6574 | *phdr_memaddr = 0; | |
6575 | *num_phdr = 0; | |
6576 | while (read (fd, buf, auxv_size) == auxv_size | |
6577 | && (*phdr_memaddr == 0 || *num_phdr == 0)) | |
6578 | { | |
6579 | if (is_elf64) | |
6580 | { | |
6581 | Elf64_auxv_t *const aux = (Elf64_auxv_t *) buf; | |
6582 | ||
6583 | switch (aux->a_type) | |
6584 | { | |
6585 | case AT_PHDR: | |
6586 | *phdr_memaddr = aux->a_un.a_val; | |
6587 | break; | |
6588 | case AT_PHNUM: | |
6589 | *num_phdr = aux->a_un.a_val; | |
6590 | break; | |
6591 | } | |
6592 | } | |
6593 | else | |
6594 | { | |
6595 | Elf32_auxv_t *const aux = (Elf32_auxv_t *) buf; | |
6596 | ||
6597 | switch (aux->a_type) | |
6598 | { | |
6599 | case AT_PHDR: | |
6600 | *phdr_memaddr = aux->a_un.a_val; | |
6601 | break; | |
6602 | case AT_PHNUM: | |
6603 | *num_phdr = aux->a_un.a_val; | |
6604 | break; | |
6605 | } | |
6606 | } | |
6607 | } | |
6608 | ||
6609 | close (fd); | |
6610 | ||
6611 | if (*phdr_memaddr == 0 || *num_phdr == 0) | |
6612 | { | |
6613 | warning ("Unexpected missing AT_PHDR and/or AT_PHNUM: " | |
6614 | "phdr_memaddr = %ld, phdr_num = %d", | |
6615 | (long) *phdr_memaddr, *num_phdr); | |
6616 | return 2; | |
6617 | } | |
6618 | ||
6619 | return 0; | |
6620 | } | |
6621 | ||
6622 | /* Return &_DYNAMIC (via PT_DYNAMIC) in the inferior, or 0 if not present. */ | |
6623 | ||
6624 | static CORE_ADDR | |
6625 | get_dynamic (const int pid, const int is_elf64) | |
6626 | { | |
6627 | CORE_ADDR phdr_memaddr, relocation; | |
db1ff28b | 6628 | int num_phdr, i; |
2268b414 | 6629 | unsigned char *phdr_buf; |
db1ff28b | 6630 | const int phdr_size = is_elf64 ? sizeof (Elf64_Phdr) : sizeof (Elf32_Phdr); |
2268b414 JK |
6631 | |
6632 | if (get_phdr_phnum_from_proc_auxv (pid, is_elf64, &phdr_memaddr, &num_phdr)) | |
6633 | return 0; | |
6634 | ||
6635 | gdb_assert (num_phdr < 100); /* Basic sanity check. */ | |
224c3ddb | 6636 | phdr_buf = (unsigned char *) alloca (num_phdr * phdr_size); |
2268b414 JK |
6637 | |
6638 | if (linux_read_memory (phdr_memaddr, phdr_buf, num_phdr * phdr_size)) | |
6639 | return 0; | |
6640 | ||
6641 | /* Compute relocation: it is expected to be 0 for "regular" executables, | |
6642 | non-zero for PIE ones. */ | |
6643 | relocation = -1; | |
db1ff28b JK |
6644 | for (i = 0; relocation == -1 && i < num_phdr; i++) |
6645 | if (is_elf64) | |
6646 | { | |
6647 | Elf64_Phdr *const p = (Elf64_Phdr *) (phdr_buf + i * phdr_size); | |
6648 | ||
6649 | if (p->p_type == PT_PHDR) | |
6650 | relocation = phdr_memaddr - p->p_vaddr; | |
6651 | } | |
6652 | else | |
6653 | { | |
6654 | Elf32_Phdr *const p = (Elf32_Phdr *) (phdr_buf + i * phdr_size); | |
6655 | ||
6656 | if (p->p_type == PT_PHDR) | |
6657 | relocation = phdr_memaddr - p->p_vaddr; | |
6658 | } | |
6659 | ||
2268b414 JK |
6660 | if (relocation == -1) |
6661 | { | |
e237a7e2 JK |
6662 | /* PT_PHDR is optional, but necessary for PIE in general. Fortunately |
6663 | any real world executables, including PIE executables, have always | |
6664 | PT_PHDR present. PT_PHDR is not present in some shared libraries or | |
6665 | in fpc (Free Pascal 2.4) binaries but neither of those have a need for | |
6666 | or present DT_DEBUG anyway (fpc binaries are statically linked). | |
6667 | ||
6668 | Therefore if there exists DT_DEBUG there is always also PT_PHDR. | |
6669 | ||
6670 | GDB could find RELOCATION also from AT_ENTRY - e_entry. */ | |
6671 | ||
2268b414 JK |
6672 | return 0; |
6673 | } | |
6674 | ||
db1ff28b JK |
6675 | for (i = 0; i < num_phdr; i++) |
6676 | { | |
6677 | if (is_elf64) | |
6678 | { | |
6679 | Elf64_Phdr *const p = (Elf64_Phdr *) (phdr_buf + i * phdr_size); | |
6680 | ||
6681 | if (p->p_type == PT_DYNAMIC) | |
6682 | return p->p_vaddr + relocation; | |
6683 | } | |
6684 | else | |
6685 | { | |
6686 | Elf32_Phdr *const p = (Elf32_Phdr *) (phdr_buf + i * phdr_size); | |
2268b414 | 6687 | |
db1ff28b JK |
6688 | if (p->p_type == PT_DYNAMIC) |
6689 | return p->p_vaddr + relocation; | |
6690 | } | |
6691 | } | |
2268b414 JK |
6692 | |
6693 | return 0; | |
6694 | } | |
6695 | ||
6696 | /* Return &_r_debug in the inferior, or -1 if not present. Return value | |
367ba2c2 MR |
6697 | can be 0 if the inferior does not yet have the library list initialized. |
6698 | We look for DT_MIPS_RLD_MAP first. MIPS executables use this instead of | |
6699 | DT_DEBUG, although they sometimes contain an unused DT_DEBUG entry too. */ | |
2268b414 JK |
6700 | |
6701 | static CORE_ADDR | |
6702 | get_r_debug (const int pid, const int is_elf64) | |
6703 | { | |
6704 | CORE_ADDR dynamic_memaddr; | |
6705 | const int dyn_size = is_elf64 ? sizeof (Elf64_Dyn) : sizeof (Elf32_Dyn); | |
6706 | unsigned char buf[sizeof (Elf64_Dyn)]; /* The larger of the two. */ | |
367ba2c2 | 6707 | CORE_ADDR map = -1; |
2268b414 JK |
6708 | |
6709 | dynamic_memaddr = get_dynamic (pid, is_elf64); | |
6710 | if (dynamic_memaddr == 0) | |
367ba2c2 | 6711 | return map; |
2268b414 JK |
6712 | |
6713 | while (linux_read_memory (dynamic_memaddr, buf, dyn_size) == 0) | |
6714 | { | |
6715 | if (is_elf64) | |
6716 | { | |
6717 | Elf64_Dyn *const dyn = (Elf64_Dyn *) buf; | |
a738da3a | 6718 | #if defined DT_MIPS_RLD_MAP || defined DT_MIPS_RLD_MAP_REL |
367ba2c2 MR |
6719 | union |
6720 | { | |
6721 | Elf64_Xword map; | |
6722 | unsigned char buf[sizeof (Elf64_Xword)]; | |
6723 | } | |
6724 | rld_map; | |
a738da3a MF |
6725 | #endif |
6726 | #ifdef DT_MIPS_RLD_MAP | |
367ba2c2 MR |
6727 | if (dyn->d_tag == DT_MIPS_RLD_MAP) |
6728 | { | |
6729 | if (linux_read_memory (dyn->d_un.d_val, | |
6730 | rld_map.buf, sizeof (rld_map.buf)) == 0) | |
6731 | return rld_map.map; | |
6732 | else | |
6733 | break; | |
6734 | } | |
75f62ce7 | 6735 | #endif /* DT_MIPS_RLD_MAP */ |
a738da3a MF |
6736 | #ifdef DT_MIPS_RLD_MAP_REL |
6737 | if (dyn->d_tag == DT_MIPS_RLD_MAP_REL) | |
6738 | { | |
6739 | if (linux_read_memory (dyn->d_un.d_val + dynamic_memaddr, | |
6740 | rld_map.buf, sizeof (rld_map.buf)) == 0) | |
6741 | return rld_map.map; | |
6742 | else | |
6743 | break; | |
6744 | } | |
6745 | #endif /* DT_MIPS_RLD_MAP_REL */ | |
2268b414 | 6746 | |
367ba2c2 MR |
6747 | if (dyn->d_tag == DT_DEBUG && map == -1) |
6748 | map = dyn->d_un.d_val; | |
2268b414 JK |
6749 | |
6750 | if (dyn->d_tag == DT_NULL) | |
6751 | break; | |
6752 | } | |
6753 | else | |
6754 | { | |
6755 | Elf32_Dyn *const dyn = (Elf32_Dyn *) buf; | |
a738da3a | 6756 | #if defined DT_MIPS_RLD_MAP || defined DT_MIPS_RLD_MAP_REL |
367ba2c2 MR |
6757 | union |
6758 | { | |
6759 | Elf32_Word map; | |
6760 | unsigned char buf[sizeof (Elf32_Word)]; | |
6761 | } | |
6762 | rld_map; | |
a738da3a MF |
6763 | #endif |
6764 | #ifdef DT_MIPS_RLD_MAP | |
367ba2c2 MR |
6765 | if (dyn->d_tag == DT_MIPS_RLD_MAP) |
6766 | { | |
6767 | if (linux_read_memory (dyn->d_un.d_val, | |
6768 | rld_map.buf, sizeof (rld_map.buf)) == 0) | |
6769 | return rld_map.map; | |
6770 | else | |
6771 | break; | |
6772 | } | |
75f62ce7 | 6773 | #endif /* DT_MIPS_RLD_MAP */ |
a738da3a MF |
6774 | #ifdef DT_MIPS_RLD_MAP_REL |
6775 | if (dyn->d_tag == DT_MIPS_RLD_MAP_REL) | |
6776 | { | |
6777 | if (linux_read_memory (dyn->d_un.d_val + dynamic_memaddr, | |
6778 | rld_map.buf, sizeof (rld_map.buf)) == 0) | |
6779 | return rld_map.map; | |
6780 | else | |
6781 | break; | |
6782 | } | |
6783 | #endif /* DT_MIPS_RLD_MAP_REL */ | |
2268b414 | 6784 | |
367ba2c2 MR |
6785 | if (dyn->d_tag == DT_DEBUG && map == -1) |
6786 | map = dyn->d_un.d_val; | |
2268b414 JK |
6787 | |
6788 | if (dyn->d_tag == DT_NULL) | |
6789 | break; | |
6790 | } | |
6791 | ||
6792 | dynamic_memaddr += dyn_size; | |
6793 | } | |
6794 | ||
367ba2c2 | 6795 | return map; |
2268b414 JK |
6796 | } |
6797 | ||
6798 | /* Read one pointer from MEMADDR in the inferior. */ | |
6799 | ||
6800 | static int | |
6801 | read_one_ptr (CORE_ADDR memaddr, CORE_ADDR *ptr, int ptr_size) | |
6802 | { | |
485f1ee4 PA |
6803 | int ret; |
6804 | ||
6805 | /* Go through a union so this works on either big or little endian | |
6806 | hosts, when the inferior's pointer size is smaller than the size | |
6807 | of CORE_ADDR. It is assumed the inferior's endianness is the | |
6808 | same of the superior's. */ | |
6809 | union | |
6810 | { | |
6811 | CORE_ADDR core_addr; | |
6812 | unsigned int ui; | |
6813 | unsigned char uc; | |
6814 | } addr; | |
6815 | ||
6816 | ret = linux_read_memory (memaddr, &addr.uc, ptr_size); | |
6817 | if (ret == 0) | |
6818 | { | |
6819 | if (ptr_size == sizeof (CORE_ADDR)) | |
6820 | *ptr = addr.core_addr; | |
6821 | else if (ptr_size == sizeof (unsigned int)) | |
6822 | *ptr = addr.ui; | |
6823 | else | |
6824 | gdb_assert_not_reached ("unhandled pointer size"); | |
6825 | } | |
6826 | return ret; | |
2268b414 JK |
6827 | } |
6828 | ||
974387bb TBA |
6829 | bool |
6830 | linux_process_target::supports_qxfer_libraries_svr4 () | |
6831 | { | |
6832 | return true; | |
6833 | } | |
6834 | ||
2268b414 JK |
6835 | struct link_map_offsets |
6836 | { | |
6837 | /* Offset and size of r_debug.r_version. */ | |
6838 | int r_version_offset; | |
6839 | ||
6840 | /* Offset and size of r_debug.r_map. */ | |
6841 | int r_map_offset; | |
6842 | ||
6843 | /* Offset to l_addr field in struct link_map. */ | |
6844 | int l_addr_offset; | |
6845 | ||
6846 | /* Offset to l_name field in struct link_map. */ | |
6847 | int l_name_offset; | |
6848 | ||
6849 | /* Offset to l_ld field in struct link_map. */ | |
6850 | int l_ld_offset; | |
6851 | ||
6852 | /* Offset to l_next field in struct link_map. */ | |
6853 | int l_next_offset; | |
6854 | ||
6855 | /* Offset to l_prev field in struct link_map. */ | |
6856 | int l_prev_offset; | |
6857 | }; | |
6858 | ||
fb723180 | 6859 | /* Construct qXfer:libraries-svr4:read reply. */ |
2268b414 | 6860 | |
974387bb TBA |
6861 | int |
6862 | linux_process_target::qxfer_libraries_svr4 (const char *annex, | |
6863 | unsigned char *readbuf, | |
6864 | unsigned const char *writebuf, | |
6865 | CORE_ADDR offset, int len) | |
2268b414 | 6866 | { |
fe978cb0 | 6867 | struct process_info_private *const priv = current_process ()->priv; |
2268b414 JK |
6868 | char filename[PATH_MAX]; |
6869 | int pid, is_elf64; | |
6870 | ||
6871 | static const struct link_map_offsets lmo_32bit_offsets = | |
6872 | { | |
6873 | 0, /* r_version offset. */ | |
6874 | 4, /* r_debug.r_map offset. */ | |
6875 | 0, /* l_addr offset in link_map. */ | |
6876 | 4, /* l_name offset in link_map. */ | |
6877 | 8, /* l_ld offset in link_map. */ | |
6878 | 12, /* l_next offset in link_map. */ | |
6879 | 16 /* l_prev offset in link_map. */ | |
6880 | }; | |
6881 | ||
6882 | static const struct link_map_offsets lmo_64bit_offsets = | |
6883 | { | |
6884 | 0, /* r_version offset. */ | |
6885 | 8, /* r_debug.r_map offset. */ | |
6886 | 0, /* l_addr offset in link_map. */ | |
6887 | 8, /* l_name offset in link_map. */ | |
6888 | 16, /* l_ld offset in link_map. */ | |
6889 | 24, /* l_next offset in link_map. */ | |
6890 | 32 /* l_prev offset in link_map. */ | |
6891 | }; | |
6892 | const struct link_map_offsets *lmo; | |
214d508e | 6893 | unsigned int machine; |
b1fbec62 GB |
6894 | int ptr_size; |
6895 | CORE_ADDR lm_addr = 0, lm_prev = 0; | |
b1fbec62 GB |
6896 | CORE_ADDR l_name, l_addr, l_ld, l_next, l_prev; |
6897 | int header_done = 0; | |
2268b414 JK |
6898 | |
6899 | if (writebuf != NULL) | |
6900 | return -2; | |
6901 | if (readbuf == NULL) | |
6902 | return -1; | |
6903 | ||
0bfdf32f | 6904 | pid = lwpid_of (current_thread); |
2268b414 | 6905 | xsnprintf (filename, sizeof filename, "/proc/%d/exe", pid); |
214d508e | 6906 | is_elf64 = elf_64_file_p (filename, &machine); |
2268b414 | 6907 | lmo = is_elf64 ? &lmo_64bit_offsets : &lmo_32bit_offsets; |
b1fbec62 | 6908 | ptr_size = is_elf64 ? 8 : 4; |
2268b414 | 6909 | |
b1fbec62 GB |
6910 | while (annex[0] != '\0') |
6911 | { | |
6912 | const char *sep; | |
6913 | CORE_ADDR *addrp; | |
da4ae14a | 6914 | int name_len; |
2268b414 | 6915 | |
b1fbec62 GB |
6916 | sep = strchr (annex, '='); |
6917 | if (sep == NULL) | |
6918 | break; | |
0c5bf5a9 | 6919 | |
da4ae14a TT |
6920 | name_len = sep - annex; |
6921 | if (name_len == 5 && startswith (annex, "start")) | |
b1fbec62 | 6922 | addrp = &lm_addr; |
da4ae14a | 6923 | else if (name_len == 4 && startswith (annex, "prev")) |
b1fbec62 GB |
6924 | addrp = &lm_prev; |
6925 | else | |
6926 | { | |
6927 | annex = strchr (sep, ';'); | |
6928 | if (annex == NULL) | |
6929 | break; | |
6930 | annex++; | |
6931 | continue; | |
6932 | } | |
6933 | ||
6934 | annex = decode_address_to_semicolon (addrp, sep + 1); | |
2268b414 | 6935 | } |
b1fbec62 GB |
6936 | |
6937 | if (lm_addr == 0) | |
2268b414 | 6938 | { |
b1fbec62 GB |
6939 | int r_version = 0; |
6940 | ||
6941 | if (priv->r_debug == 0) | |
6942 | priv->r_debug = get_r_debug (pid, is_elf64); | |
6943 | ||
6944 | /* We failed to find DT_DEBUG. Such situation will not change | |
6945 | for this inferior - do not retry it. Report it to GDB as | |
6946 | E01, see for the reasons at the GDB solib-svr4.c side. */ | |
6947 | if (priv->r_debug == (CORE_ADDR) -1) | |
6948 | return -1; | |
6949 | ||
6950 | if (priv->r_debug != 0) | |
2268b414 | 6951 | { |
b1fbec62 GB |
6952 | if (linux_read_memory (priv->r_debug + lmo->r_version_offset, |
6953 | (unsigned char *) &r_version, | |
6954 | sizeof (r_version)) != 0 | |
6955 | || r_version != 1) | |
6956 | { | |
6957 | warning ("unexpected r_debug version %d", r_version); | |
6958 | } | |
6959 | else if (read_one_ptr (priv->r_debug + lmo->r_map_offset, | |
6960 | &lm_addr, ptr_size) != 0) | |
6961 | { | |
6962 | warning ("unable to read r_map from 0x%lx", | |
6963 | (long) priv->r_debug + lmo->r_map_offset); | |
6964 | } | |
2268b414 | 6965 | } |
b1fbec62 | 6966 | } |
2268b414 | 6967 | |
f6e8a41e | 6968 | std::string document = "<library-list-svr4 version=\"1.0\""; |
b1fbec62 GB |
6969 | |
6970 | while (lm_addr | |
6971 | && read_one_ptr (lm_addr + lmo->l_name_offset, | |
6972 | &l_name, ptr_size) == 0 | |
6973 | && read_one_ptr (lm_addr + lmo->l_addr_offset, | |
6974 | &l_addr, ptr_size) == 0 | |
6975 | && read_one_ptr (lm_addr + lmo->l_ld_offset, | |
6976 | &l_ld, ptr_size) == 0 | |
6977 | && read_one_ptr (lm_addr + lmo->l_prev_offset, | |
6978 | &l_prev, ptr_size) == 0 | |
6979 | && read_one_ptr (lm_addr + lmo->l_next_offset, | |
6980 | &l_next, ptr_size) == 0) | |
6981 | { | |
6982 | unsigned char libname[PATH_MAX]; | |
6983 | ||
6984 | if (lm_prev != l_prev) | |
2268b414 | 6985 | { |
b1fbec62 GB |
6986 | warning ("Corrupted shared library list: 0x%lx != 0x%lx", |
6987 | (long) lm_prev, (long) l_prev); | |
6988 | break; | |
2268b414 JK |
6989 | } |
6990 | ||
d878444c JK |
6991 | /* Ignore the first entry even if it has valid name as the first entry |
6992 | corresponds to the main executable. The first entry should not be | |
6993 | skipped if the dynamic loader was loaded late by a static executable | |
6994 | (see solib-svr4.c parameter ignore_first). But in such case the main | |
6995 | executable does not have PT_DYNAMIC present and this function already | |
6996 | exited above due to failed get_r_debug. */ | |
6997 | if (lm_prev == 0) | |
f6e8a41e | 6998 | string_appendf (document, " main-lm=\"0x%lx\"", (unsigned long) lm_addr); |
d878444c JK |
6999 | else |
7000 | { | |
7001 | /* Not checking for error because reading may stop before | |
7002 | we've got PATH_MAX worth of characters. */ | |
7003 | libname[0] = '\0'; | |
7004 | linux_read_memory (l_name, libname, sizeof (libname) - 1); | |
7005 | libname[sizeof (libname) - 1] = '\0'; | |
7006 | if (libname[0] != '\0') | |
2268b414 | 7007 | { |
d878444c JK |
7008 | if (!header_done) |
7009 | { | |
7010 | /* Terminate `<library-list-svr4'. */ | |
f6e8a41e | 7011 | document += '>'; |
d878444c JK |
7012 | header_done = 1; |
7013 | } | |
2268b414 | 7014 | |
e6a58aa8 SM |
7015 | string_appendf (document, "<library name=\""); |
7016 | xml_escape_text_append (&document, (char *) libname); | |
7017 | string_appendf (document, "\" lm=\"0x%lx\" " | |
f6e8a41e | 7018 | "l_addr=\"0x%lx\" l_ld=\"0x%lx\"/>", |
e6a58aa8 SM |
7019 | (unsigned long) lm_addr, (unsigned long) l_addr, |
7020 | (unsigned long) l_ld); | |
d878444c | 7021 | } |
0afae3cf | 7022 | } |
b1fbec62 GB |
7023 | |
7024 | lm_prev = lm_addr; | |
7025 | lm_addr = l_next; | |
2268b414 JK |
7026 | } |
7027 | ||
b1fbec62 GB |
7028 | if (!header_done) |
7029 | { | |
7030 | /* Empty list; terminate `<library-list-svr4'. */ | |
f6e8a41e | 7031 | document += "/>"; |
b1fbec62 GB |
7032 | } |
7033 | else | |
f6e8a41e | 7034 | document += "</library-list-svr4>"; |
b1fbec62 | 7035 | |
f6e8a41e | 7036 | int document_len = document.length (); |
2268b414 JK |
7037 | if (offset < document_len) |
7038 | document_len -= offset; | |
7039 | else | |
7040 | document_len = 0; | |
7041 | if (len > document_len) | |
7042 | len = document_len; | |
7043 | ||
f6e8a41e | 7044 | memcpy (readbuf, document.data () + offset, len); |
2268b414 JK |
7045 | |
7046 | return len; | |
7047 | } | |
7048 | ||
9accd112 MM |
7049 | #ifdef HAVE_LINUX_BTRACE |
7050 | ||
79597bdd TBA |
7051 | btrace_target_info * |
7052 | linux_process_target::enable_btrace (ptid_t ptid, | |
7053 | const btrace_config *conf) | |
7054 | { | |
7055 | return linux_enable_btrace (ptid, conf); | |
7056 | } | |
7057 | ||
969c39fb | 7058 | /* See to_disable_btrace target method. */ |
9accd112 | 7059 | |
79597bdd TBA |
7060 | int |
7061 | linux_process_target::disable_btrace (btrace_target_info *tinfo) | |
969c39fb MM |
7062 | { |
7063 | enum btrace_error err; | |
7064 | ||
7065 | err = linux_disable_btrace (tinfo); | |
7066 | return (err == BTRACE_ERR_NONE ? 0 : -1); | |
7067 | } | |
7068 | ||
bc504a31 | 7069 | /* Encode an Intel Processor Trace configuration. */ |
b20a6524 MM |
7070 | |
7071 | static void | |
7072 | linux_low_encode_pt_config (struct buffer *buffer, | |
7073 | const struct btrace_data_pt_config *config) | |
7074 | { | |
7075 | buffer_grow_str (buffer, "<pt-config>\n"); | |
7076 | ||
7077 | switch (config->cpu.vendor) | |
7078 | { | |
7079 | case CV_INTEL: | |
7080 | buffer_xml_printf (buffer, "<cpu vendor=\"GenuineIntel\" family=\"%u\" " | |
7081 | "model=\"%u\" stepping=\"%u\"/>\n", | |
7082 | config->cpu.family, config->cpu.model, | |
7083 | config->cpu.stepping); | |
7084 | break; | |
7085 | ||
7086 | default: | |
7087 | break; | |
7088 | } | |
7089 | ||
7090 | buffer_grow_str (buffer, "</pt-config>\n"); | |
7091 | } | |
7092 | ||
7093 | /* Encode a raw buffer. */ | |
7094 | ||
7095 | static void | |
7096 | linux_low_encode_raw (struct buffer *buffer, const gdb_byte *data, | |
7097 | unsigned int size) | |
7098 | { | |
7099 | if (size == 0) | |
7100 | return; | |
7101 | ||
268a13a5 | 7102 | /* We use hex encoding - see gdbsupport/rsp-low.h. */ |
b20a6524 MM |
7103 | buffer_grow_str (buffer, "<raw>\n"); |
7104 | ||
7105 | while (size-- > 0) | |
7106 | { | |
7107 | char elem[2]; | |
7108 | ||
7109 | elem[0] = tohex ((*data >> 4) & 0xf); | |
7110 | elem[1] = tohex (*data++ & 0xf); | |
7111 | ||
7112 | buffer_grow (buffer, elem, 2); | |
7113 | } | |
7114 | ||
7115 | buffer_grow_str (buffer, "</raw>\n"); | |
7116 | } | |
7117 | ||
969c39fb MM |
7118 | /* See to_read_btrace target method. */ |
7119 | ||
79597bdd TBA |
7120 | int |
7121 | linux_process_target::read_btrace (btrace_target_info *tinfo, | |
7122 | buffer *buffer, | |
7123 | enum btrace_read_type type) | |
9accd112 | 7124 | { |
734b0e4b | 7125 | struct btrace_data btrace; |
969c39fb | 7126 | enum btrace_error err; |
9accd112 | 7127 | |
969c39fb MM |
7128 | err = linux_read_btrace (&btrace, tinfo, type); |
7129 | if (err != BTRACE_ERR_NONE) | |
7130 | { | |
7131 | if (err == BTRACE_ERR_OVERFLOW) | |
7132 | buffer_grow_str0 (buffer, "E.Overflow."); | |
7133 | else | |
7134 | buffer_grow_str0 (buffer, "E.Generic Error."); | |
7135 | ||
8dcc53b3 | 7136 | return -1; |
969c39fb | 7137 | } |
9accd112 | 7138 | |
734b0e4b MM |
7139 | switch (btrace.format) |
7140 | { | |
7141 | case BTRACE_FORMAT_NONE: | |
7142 | buffer_grow_str0 (buffer, "E.No Trace."); | |
8dcc53b3 | 7143 | return -1; |
734b0e4b MM |
7144 | |
7145 | case BTRACE_FORMAT_BTS: | |
7146 | buffer_grow_str (buffer, "<!DOCTYPE btrace SYSTEM \"btrace.dtd\">\n"); | |
7147 | buffer_grow_str (buffer, "<btrace version=\"1.0\">\n"); | |
9accd112 | 7148 | |
46f29a9a | 7149 | for (const btrace_block &block : *btrace.variant.bts.blocks) |
734b0e4b | 7150 | buffer_xml_printf (buffer, "<block begin=\"0x%s\" end=\"0x%s\"/>\n", |
46f29a9a | 7151 | paddress (block.begin), paddress (block.end)); |
9accd112 | 7152 | |
734b0e4b MM |
7153 | buffer_grow_str0 (buffer, "</btrace>\n"); |
7154 | break; | |
7155 | ||
b20a6524 MM |
7156 | case BTRACE_FORMAT_PT: |
7157 | buffer_grow_str (buffer, "<!DOCTYPE btrace SYSTEM \"btrace.dtd\">\n"); | |
7158 | buffer_grow_str (buffer, "<btrace version=\"1.0\">\n"); | |
7159 | buffer_grow_str (buffer, "<pt>\n"); | |
7160 | ||
7161 | linux_low_encode_pt_config (buffer, &btrace.variant.pt.config); | |
9accd112 | 7162 | |
b20a6524 MM |
7163 | linux_low_encode_raw (buffer, btrace.variant.pt.data, |
7164 | btrace.variant.pt.size); | |
7165 | ||
7166 | buffer_grow_str (buffer, "</pt>\n"); | |
7167 | buffer_grow_str0 (buffer, "</btrace>\n"); | |
7168 | break; | |
7169 | ||
7170 | default: | |
7171 | buffer_grow_str0 (buffer, "E.Unsupported Trace Format."); | |
8dcc53b3 | 7172 | return -1; |
734b0e4b | 7173 | } |
969c39fb MM |
7174 | |
7175 | return 0; | |
9accd112 | 7176 | } |
f4abbc16 MM |
7177 | |
7178 | /* See to_btrace_conf target method. */ | |
7179 | ||
79597bdd TBA |
7180 | int |
7181 | linux_process_target::read_btrace_conf (const btrace_target_info *tinfo, | |
7182 | buffer *buffer) | |
f4abbc16 MM |
7183 | { |
7184 | const struct btrace_config *conf; | |
7185 | ||
7186 | buffer_grow_str (buffer, "<!DOCTYPE btrace-conf SYSTEM \"btrace-conf.dtd\">\n"); | |
7187 | buffer_grow_str (buffer, "<btrace-conf version=\"1.0\">\n"); | |
7188 | ||
7189 | conf = linux_btrace_conf (tinfo); | |
7190 | if (conf != NULL) | |
7191 | { | |
7192 | switch (conf->format) | |
7193 | { | |
7194 | case BTRACE_FORMAT_NONE: | |
7195 | break; | |
7196 | ||
7197 | case BTRACE_FORMAT_BTS: | |
d33501a5 MM |
7198 | buffer_xml_printf (buffer, "<bts"); |
7199 | buffer_xml_printf (buffer, " size=\"0x%x\"", conf->bts.size); | |
7200 | buffer_xml_printf (buffer, " />\n"); | |
f4abbc16 | 7201 | break; |
b20a6524 MM |
7202 | |
7203 | case BTRACE_FORMAT_PT: | |
7204 | buffer_xml_printf (buffer, "<pt"); | |
7205 | buffer_xml_printf (buffer, " size=\"0x%x\"", conf->pt.size); | |
7206 | buffer_xml_printf (buffer, "/>\n"); | |
7207 | break; | |
f4abbc16 MM |
7208 | } |
7209 | } | |
7210 | ||
7211 | buffer_grow_str0 (buffer, "</btrace-conf>\n"); | |
7212 | return 0; | |
7213 | } | |
9accd112 MM |
7214 | #endif /* HAVE_LINUX_BTRACE */ |
7215 | ||
7b669087 GB |
7216 | /* See nat/linux-nat.h. */ |
7217 | ||
7218 | ptid_t | |
7219 | current_lwp_ptid (void) | |
7220 | { | |
7221 | return ptid_of (current_thread); | |
7222 | } | |
7223 | ||
dd373349 AT |
7224 | /* Implementation of the target_ops method "breakpoint_kind_from_pc". */ |
7225 | ||
d367006f TBA |
7226 | int |
7227 | linux_process_target::breakpoint_kind_from_pc (CORE_ADDR *pcptr) | |
dd373349 AT |
7228 | { |
7229 | if (the_low_target.breakpoint_kind_from_pc != NULL) | |
7230 | return (*the_low_target.breakpoint_kind_from_pc) (pcptr); | |
7231 | else | |
52405d85 | 7232 | return process_stratum_target::breakpoint_kind_from_pc (pcptr); |
dd373349 AT |
7233 | } |
7234 | ||
7235 | /* Implementation of the target_ops method "sw_breakpoint_from_kind". */ | |
7236 | ||
d367006f TBA |
7237 | const gdb_byte * |
7238 | linux_process_target::sw_breakpoint_from_kind (int kind, int *size) | |
dd373349 AT |
7239 | { |
7240 | gdb_assert (the_low_target.sw_breakpoint_from_kind != NULL); | |
7241 | ||
7242 | return (*the_low_target.sw_breakpoint_from_kind) (kind, size); | |
7243 | } | |
7244 | ||
769ef81f AT |
7245 | /* Implementation of the target_ops method |
7246 | "breakpoint_kind_from_current_state". */ | |
7247 | ||
d367006f TBA |
7248 | int |
7249 | linux_process_target::breakpoint_kind_from_current_state (CORE_ADDR *pcptr) | |
769ef81f AT |
7250 | { |
7251 | if (the_low_target.breakpoint_kind_from_current_state != NULL) | |
7252 | return (*the_low_target.breakpoint_kind_from_current_state) (pcptr); | |
7253 | else | |
d367006f | 7254 | return breakpoint_kind_from_pc (pcptr); |
769ef81f AT |
7255 | } |
7256 | ||
7f63b89b TBA |
7257 | const char * |
7258 | linux_process_target::thread_name (ptid_t thread) | |
7259 | { | |
7260 | return linux_proc_tid_get_name (thread); | |
7261 | } | |
7262 | ||
7263 | #if USE_THREAD_DB | |
7264 | bool | |
7265 | linux_process_target::thread_handle (ptid_t ptid, gdb_byte **handle, | |
7266 | int *handle_len) | |
7267 | { | |
7268 | return thread_db_thread_handle (ptid, handle, handle_len); | |
7269 | } | |
7270 | #endif | |
7271 | ||
276d4552 YQ |
7272 | /* Default implementation of linux_target_ops method "set_pc" for |
7273 | 32-bit pc register which is literally named "pc". */ | |
7274 | ||
7275 | void | |
7276 | linux_set_pc_32bit (struct regcache *regcache, CORE_ADDR pc) | |
7277 | { | |
7278 | uint32_t newpc = pc; | |
7279 | ||
7280 | supply_register_by_name (regcache, "pc", &newpc); | |
7281 | } | |
7282 | ||
7283 | /* Default implementation of linux_target_ops method "get_pc" for | |
7284 | 32-bit pc register which is literally named "pc". */ | |
7285 | ||
7286 | CORE_ADDR | |
7287 | linux_get_pc_32bit (struct regcache *regcache) | |
7288 | { | |
7289 | uint32_t pc; | |
7290 | ||
7291 | collect_register_by_name (regcache, "pc", &pc); | |
7292 | if (debug_threads) | |
7293 | debug_printf ("stop pc is 0x%" PRIx32 "\n", pc); | |
7294 | return pc; | |
7295 | } | |
7296 | ||
6f69e520 YQ |
7297 | /* Default implementation of linux_target_ops method "set_pc" for |
7298 | 64-bit pc register which is literally named "pc". */ | |
7299 | ||
7300 | void | |
7301 | linux_set_pc_64bit (struct regcache *regcache, CORE_ADDR pc) | |
7302 | { | |
7303 | uint64_t newpc = pc; | |
7304 | ||
7305 | supply_register_by_name (regcache, "pc", &newpc); | |
7306 | } | |
7307 | ||
7308 | /* Default implementation of linux_target_ops method "get_pc" for | |
7309 | 64-bit pc register which is literally named "pc". */ | |
7310 | ||
7311 | CORE_ADDR | |
7312 | linux_get_pc_64bit (struct regcache *regcache) | |
7313 | { | |
7314 | uint64_t pc; | |
7315 | ||
7316 | collect_register_by_name (regcache, "pc", &pc); | |
7317 | if (debug_threads) | |
7318 | debug_printf ("stop pc is 0x%" PRIx64 "\n", pc); | |
7319 | return pc; | |
7320 | } | |
7321 | ||
0570503d | 7322 | /* See linux-low.h. */ |
974c89e0 | 7323 | |
0570503d PFC |
7324 | int |
7325 | linux_get_auxv (int wordsize, CORE_ADDR match, CORE_ADDR *valp) | |
974c89e0 AH |
7326 | { |
7327 | gdb_byte *data = (gdb_byte *) alloca (2 * wordsize); | |
7328 | int offset = 0; | |
7329 | ||
7330 | gdb_assert (wordsize == 4 || wordsize == 8); | |
7331 | ||
52405d85 | 7332 | while (the_target->read_auxv (offset, data, 2 * wordsize) == 2 * wordsize) |
974c89e0 AH |
7333 | { |
7334 | if (wordsize == 4) | |
7335 | { | |
0570503d | 7336 | uint32_t *data_p = (uint32_t *) data; |
974c89e0 | 7337 | if (data_p[0] == match) |
0570503d PFC |
7338 | { |
7339 | *valp = data_p[1]; | |
7340 | return 1; | |
7341 | } | |
974c89e0 AH |
7342 | } |
7343 | else | |
7344 | { | |
0570503d | 7345 | uint64_t *data_p = (uint64_t *) data; |
974c89e0 | 7346 | if (data_p[0] == match) |
0570503d PFC |
7347 | { |
7348 | *valp = data_p[1]; | |
7349 | return 1; | |
7350 | } | |
974c89e0 AH |
7351 | } |
7352 | ||
7353 | offset += 2 * wordsize; | |
7354 | } | |
7355 | ||
7356 | return 0; | |
7357 | } | |
7358 | ||
7359 | /* See linux-low.h. */ | |
7360 | ||
7361 | CORE_ADDR | |
7362 | linux_get_hwcap (int wordsize) | |
7363 | { | |
0570503d PFC |
7364 | CORE_ADDR hwcap = 0; |
7365 | linux_get_auxv (wordsize, AT_HWCAP, &hwcap); | |
7366 | return hwcap; | |
974c89e0 AH |
7367 | } |
7368 | ||
7369 | /* See linux-low.h. */ | |
7370 | ||
7371 | CORE_ADDR | |
7372 | linux_get_hwcap2 (int wordsize) | |
7373 | { | |
0570503d PFC |
7374 | CORE_ADDR hwcap2 = 0; |
7375 | linux_get_auxv (wordsize, AT_HWCAP2, &hwcap2); | |
7376 | return hwcap2; | |
974c89e0 | 7377 | } |
6f69e520 | 7378 | |
3aee8918 PA |
7379 | #ifdef HAVE_LINUX_REGSETS |
7380 | void | |
7381 | initialize_regsets_info (struct regsets_info *info) | |
7382 | { | |
7383 | for (info->num_regsets = 0; | |
7384 | info->regsets[info->num_regsets].size >= 0; | |
7385 | info->num_regsets++) | |
7386 | ; | |
3aee8918 PA |
7387 | } |
7388 | #endif | |
7389 | ||
da6d8c04 DJ |
7390 | void |
7391 | initialize_low (void) | |
7392 | { | |
bd99dc85 | 7393 | struct sigaction sigchld_action; |
dd373349 | 7394 | |
bd99dc85 | 7395 | memset (&sigchld_action, 0, sizeof (sigchld_action)); |
ef0478f6 | 7396 | set_target_ops (the_linux_target); |
dd373349 | 7397 | |
aa7c7447 | 7398 | linux_ptrace_init_warnings (); |
1b919490 | 7399 | linux_proc_init_warnings (); |
bd99dc85 PA |
7400 | |
7401 | sigchld_action.sa_handler = sigchld_handler; | |
7402 | sigemptyset (&sigchld_action.sa_mask); | |
7403 | sigchld_action.sa_flags = SA_RESTART; | |
7404 | sigaction (SIGCHLD, &sigchld_action, NULL); | |
3aee8918 PA |
7405 | |
7406 | initialize_low_arch (); | |
89245bc0 DB |
7407 | |
7408 | linux_check_ptrace_features (); | |
da6d8c04 | 7409 | } |