Commit | Line | Data |
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da6d8c04 | 1 | /* Low level interface to ptrace, for the remote server for GDB. |
e2882c85 | 2 | Copyright (C) 1995-2018 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" |
58b4daa5 | 22 | #include "agent.h" |
de0d863e | 23 | #include "tdesc.h" |
b20a6524 | 24 | #include "rsp-low.h" |
f348d89a | 25 | #include "signals-state-save-restore.h" |
96d7229d LM |
26 | #include "nat/linux-nat.h" |
27 | #include "nat/linux-waitpid.h" | |
8bdce1ff | 28 | #include "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> |
602e3198 | 46 | #include "filestuff.h" |
c144c7a0 | 47 | #include "tracepoint.h" |
533b0600 | 48 | #include "hostio.h" |
276d4552 | 49 | #include <inttypes.h> |
2090129c SDJ |
50 | #include "common-inferior.h" |
51 | #include "nat/fork-inferior.h" | |
52 | #include "environ.h" | |
8ce47547 | 53 | #include "common/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 UW |
62 | |
63 | #ifndef SPUFS_MAGIC | |
64 | #define SPUFS_MAGIC 0x23c9b64e | |
65 | #endif | |
da6d8c04 | 66 | |
03583c20 UW |
67 | #ifdef HAVE_PERSONALITY |
68 | # include <sys/personality.h> | |
69 | # if !HAVE_DECL_ADDR_NO_RANDOMIZE | |
70 | # define ADDR_NO_RANDOMIZE 0x0040000 | |
71 | # endif | |
72 | #endif | |
73 | ||
fd462a61 DJ |
74 | #ifndef O_LARGEFILE |
75 | #define O_LARGEFILE 0 | |
76 | #endif | |
1a981360 | 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 | ||
9accd112 | 102 | #ifdef HAVE_LINUX_BTRACE |
125f8a3d | 103 | # include "nat/linux-btrace.h" |
734b0e4b | 104 | # include "btrace-common.h" |
9accd112 MM |
105 | #endif |
106 | ||
8365dcf5 TJB |
107 | #ifndef HAVE_ELF32_AUXV_T |
108 | /* Copied from glibc's elf.h. */ | |
109 | typedef struct | |
110 | { | |
111 | uint32_t a_type; /* Entry type */ | |
112 | union | |
113 | { | |
114 | uint32_t a_val; /* Integer value */ | |
115 | /* We use to have pointer elements added here. We cannot do that, | |
116 | though, since it does not work when using 32-bit definitions | |
117 | on 64-bit platforms and vice versa. */ | |
118 | } a_un; | |
119 | } Elf32_auxv_t; | |
120 | #endif | |
121 | ||
122 | #ifndef HAVE_ELF64_AUXV_T | |
123 | /* Copied from glibc's elf.h. */ | |
124 | typedef struct | |
125 | { | |
126 | uint64_t a_type; /* Entry type */ | |
127 | union | |
128 | { | |
129 | uint64_t a_val; /* Integer value */ | |
130 | /* We use to have pointer elements added here. We cannot do that, | |
131 | though, since it does not work when using 32-bit definitions | |
132 | on 64-bit platforms and vice versa. */ | |
133 | } a_un; | |
134 | } Elf64_auxv_t; | |
135 | #endif | |
136 | ||
ded48a5e YQ |
137 | /* Does the current host support PTRACE_GETREGSET? */ |
138 | int have_ptrace_getregset = -1; | |
139 | ||
cff068da GB |
140 | /* LWP accessors. */ |
141 | ||
142 | /* See nat/linux-nat.h. */ | |
143 | ||
144 | ptid_t | |
145 | ptid_of_lwp (struct lwp_info *lwp) | |
146 | { | |
147 | return ptid_of (get_lwp_thread (lwp)); | |
148 | } | |
149 | ||
150 | /* See nat/linux-nat.h. */ | |
151 | ||
4b134ca1 GB |
152 | void |
153 | lwp_set_arch_private_info (struct lwp_info *lwp, | |
154 | struct arch_lwp_info *info) | |
155 | { | |
156 | lwp->arch_private = info; | |
157 | } | |
158 | ||
159 | /* See nat/linux-nat.h. */ | |
160 | ||
161 | struct arch_lwp_info * | |
162 | lwp_arch_private_info (struct lwp_info *lwp) | |
163 | { | |
164 | return lwp->arch_private; | |
165 | } | |
166 | ||
167 | /* See nat/linux-nat.h. */ | |
168 | ||
cff068da GB |
169 | int |
170 | lwp_is_stopped (struct lwp_info *lwp) | |
171 | { | |
172 | return lwp->stopped; | |
173 | } | |
174 | ||
175 | /* See nat/linux-nat.h. */ | |
176 | ||
177 | enum target_stop_reason | |
178 | lwp_stop_reason (struct lwp_info *lwp) | |
179 | { | |
180 | return lwp->stop_reason; | |
181 | } | |
182 | ||
0e00e962 AA |
183 | /* See nat/linux-nat.h. */ |
184 | ||
185 | int | |
186 | lwp_is_stepping (struct lwp_info *lwp) | |
187 | { | |
188 | return lwp->stepping; | |
189 | } | |
190 | ||
05044653 PA |
191 | /* A list of all unknown processes which receive stop signals. Some |
192 | other process will presumably claim each of these as forked | |
193 | children momentarily. */ | |
24a09b5f | 194 | |
05044653 PA |
195 | struct simple_pid_list |
196 | { | |
197 | /* The process ID. */ | |
198 | int pid; | |
199 | ||
200 | /* The status as reported by waitpid. */ | |
201 | int status; | |
202 | ||
203 | /* Next in chain. */ | |
204 | struct simple_pid_list *next; | |
205 | }; | |
206 | struct simple_pid_list *stopped_pids; | |
207 | ||
208 | /* Trivial list manipulation functions to keep track of a list of new | |
209 | stopped processes. */ | |
210 | ||
211 | static void | |
212 | add_to_pid_list (struct simple_pid_list **listp, int pid, int status) | |
213 | { | |
8d749320 | 214 | struct simple_pid_list *new_pid = XNEW (struct simple_pid_list); |
05044653 PA |
215 | |
216 | new_pid->pid = pid; | |
217 | new_pid->status = status; | |
218 | new_pid->next = *listp; | |
219 | *listp = new_pid; | |
220 | } | |
221 | ||
222 | static int | |
223 | pull_pid_from_list (struct simple_pid_list **listp, int pid, int *statusp) | |
224 | { | |
225 | struct simple_pid_list **p; | |
226 | ||
227 | for (p = listp; *p != NULL; p = &(*p)->next) | |
228 | if ((*p)->pid == pid) | |
229 | { | |
230 | struct simple_pid_list *next = (*p)->next; | |
231 | ||
232 | *statusp = (*p)->status; | |
233 | xfree (*p); | |
234 | *p = next; | |
235 | return 1; | |
236 | } | |
237 | return 0; | |
238 | } | |
24a09b5f | 239 | |
bde24c0a PA |
240 | enum stopping_threads_kind |
241 | { | |
242 | /* Not stopping threads presently. */ | |
243 | NOT_STOPPING_THREADS, | |
244 | ||
245 | /* Stopping threads. */ | |
246 | STOPPING_THREADS, | |
247 | ||
248 | /* Stopping and suspending threads. */ | |
249 | STOPPING_AND_SUSPENDING_THREADS | |
250 | }; | |
251 | ||
252 | /* This is set while stop_all_lwps is in effect. */ | |
253 | enum stopping_threads_kind stopping_threads = NOT_STOPPING_THREADS; | |
0d62e5e8 DJ |
254 | |
255 | /* FIXME make into a target method? */ | |
24a09b5f | 256 | int using_threads = 1; |
24a09b5f | 257 | |
fa593d66 PA |
258 | /* True if we're presently stabilizing threads (moving them out of |
259 | jump pads). */ | |
260 | static int stabilizing_threads; | |
261 | ||
2acc282a | 262 | static void linux_resume_one_lwp (struct lwp_info *lwp, |
54a0b537 | 263 | int step, int signal, siginfo_t *info); |
2bd7c093 | 264 | static void linux_resume (struct thread_resume *resume_info, size_t n); |
7984d532 PA |
265 | static void stop_all_lwps (int suspend, struct lwp_info *except); |
266 | static void unstop_all_lwps (int unsuspend, struct lwp_info *except); | |
f50bf8e5 | 267 | static void unsuspend_all_lwps (struct lwp_info *except); |
fa96cb38 PA |
268 | static int linux_wait_for_event_filtered (ptid_t wait_ptid, ptid_t filter_ptid, |
269 | int *wstat, int options); | |
95954743 | 270 | static int linux_wait_for_event (ptid_t ptid, int *wstat, int options); |
b3312d80 | 271 | static struct lwp_info *add_lwp (ptid_t ptid); |
94585166 | 272 | static void linux_mourn (struct process_info *process); |
c35fafde | 273 | static int linux_stopped_by_watchpoint (void); |
95954743 | 274 | static void mark_lwp_dead (struct lwp_info *lwp, int wstat); |
00db26fa | 275 | static int lwp_is_marked_dead (struct lwp_info *lwp); |
d50171e4 | 276 | static void proceed_all_lwps (void); |
d50171e4 | 277 | static int finish_step_over (struct lwp_info *lwp); |
d50171e4 | 278 | static int kill_lwp (unsigned long lwpid, int signo); |
863d01bd PA |
279 | static void enqueue_pending_signal (struct lwp_info *lwp, int signal, siginfo_t *info); |
280 | static void complete_ongoing_step_over (void); | |
ece66d65 | 281 | static int linux_low_ptrace_options (int attached); |
ced2dffb | 282 | static int check_ptrace_stopped_lwp_gone (struct lwp_info *lp); |
e2b44075 | 283 | static void proceed_one_lwp (thread_info *thread, lwp_info *except); |
d50171e4 | 284 | |
582511be PA |
285 | /* When the event-loop is doing a step-over, this points at the thread |
286 | being stepped. */ | |
287 | ptid_t step_over_bkpt; | |
288 | ||
7d00775e | 289 | /* True if the low target can hardware single-step. */ |
d50171e4 PA |
290 | |
291 | static int | |
292 | can_hardware_single_step (void) | |
293 | { | |
7d00775e AT |
294 | if (the_low_target.supports_hardware_single_step != NULL) |
295 | return the_low_target.supports_hardware_single_step (); | |
296 | else | |
297 | return 0; | |
298 | } | |
299 | ||
300 | /* True if the low target can software single-step. Such targets | |
fa5308bd | 301 | implement the GET_NEXT_PCS callback. */ |
7d00775e AT |
302 | |
303 | static int | |
304 | can_software_single_step (void) | |
305 | { | |
fa5308bd | 306 | return (the_low_target.get_next_pcs != NULL); |
d50171e4 PA |
307 | } |
308 | ||
309 | /* True if the low target supports memory breakpoints. If so, we'll | |
310 | have a GET_PC implementation. */ | |
311 | ||
312 | static int | |
313 | supports_breakpoints (void) | |
314 | { | |
315 | return (the_low_target.get_pc != NULL); | |
316 | } | |
0d62e5e8 | 317 | |
fa593d66 PA |
318 | /* Returns true if this target can support fast tracepoints. This |
319 | does not mean that the in-process agent has been loaded in the | |
320 | inferior. */ | |
321 | ||
322 | static int | |
323 | supports_fast_tracepoints (void) | |
324 | { | |
325 | return the_low_target.install_fast_tracepoint_jump_pad != NULL; | |
326 | } | |
327 | ||
c2d6af84 PA |
328 | /* True if LWP is stopped in its stepping range. */ |
329 | ||
330 | static int | |
331 | lwp_in_step_range (struct lwp_info *lwp) | |
332 | { | |
333 | CORE_ADDR pc = lwp->stop_pc; | |
334 | ||
335 | return (pc >= lwp->step_range_start && pc < lwp->step_range_end); | |
336 | } | |
337 | ||
0d62e5e8 DJ |
338 | struct pending_signals |
339 | { | |
340 | int signal; | |
32ca6d61 | 341 | siginfo_t info; |
0d62e5e8 DJ |
342 | struct pending_signals *prev; |
343 | }; | |
611cb4a5 | 344 | |
bd99dc85 PA |
345 | /* The read/write ends of the pipe registered as waitable file in the |
346 | event loop. */ | |
347 | static int linux_event_pipe[2] = { -1, -1 }; | |
348 | ||
349 | /* True if we're currently in async mode. */ | |
350 | #define target_is_async_p() (linux_event_pipe[0] != -1) | |
351 | ||
02fc4de7 | 352 | static void send_sigstop (struct lwp_info *lwp); |
fa96cb38 | 353 | static void wait_for_sigstop (void); |
bd99dc85 | 354 | |
d0722149 DE |
355 | /* Return non-zero if HEADER is a 64-bit ELF file. */ |
356 | ||
357 | static int | |
214d508e | 358 | elf_64_header_p (const Elf64_Ehdr *header, unsigned int *machine) |
d0722149 | 359 | { |
214d508e L |
360 | if (header->e_ident[EI_MAG0] == ELFMAG0 |
361 | && header->e_ident[EI_MAG1] == ELFMAG1 | |
362 | && header->e_ident[EI_MAG2] == ELFMAG2 | |
363 | && header->e_ident[EI_MAG3] == ELFMAG3) | |
364 | { | |
365 | *machine = header->e_machine; | |
366 | return header->e_ident[EI_CLASS] == ELFCLASS64; | |
367 | ||
368 | } | |
369 | *machine = EM_NONE; | |
370 | return -1; | |
d0722149 DE |
371 | } |
372 | ||
373 | /* Return non-zero if FILE is a 64-bit ELF file, | |
374 | zero if the file is not a 64-bit ELF file, | |
375 | and -1 if the file is not accessible or doesn't exist. */ | |
376 | ||
be07f1a2 | 377 | static int |
214d508e | 378 | elf_64_file_p (const char *file, unsigned int *machine) |
d0722149 | 379 | { |
957f3f49 | 380 | Elf64_Ehdr header; |
d0722149 DE |
381 | int fd; |
382 | ||
383 | fd = open (file, O_RDONLY); | |
384 | if (fd < 0) | |
385 | return -1; | |
386 | ||
387 | if (read (fd, &header, sizeof (header)) != sizeof (header)) | |
388 | { | |
389 | close (fd); | |
390 | return 0; | |
391 | } | |
392 | close (fd); | |
393 | ||
214d508e | 394 | return elf_64_header_p (&header, machine); |
d0722149 DE |
395 | } |
396 | ||
be07f1a2 PA |
397 | /* Accepts an integer PID; Returns true if the executable PID is |
398 | running is a 64-bit ELF file.. */ | |
399 | ||
400 | int | |
214d508e | 401 | linux_pid_exe_is_elf_64_file (int pid, unsigned int *machine) |
be07f1a2 | 402 | { |
d8d2a3ee | 403 | char file[PATH_MAX]; |
be07f1a2 PA |
404 | |
405 | sprintf (file, "/proc/%d/exe", pid); | |
214d508e | 406 | return elf_64_file_p (file, machine); |
be07f1a2 PA |
407 | } |
408 | ||
bd99dc85 PA |
409 | static void |
410 | delete_lwp (struct lwp_info *lwp) | |
411 | { | |
fa96cb38 PA |
412 | struct thread_info *thr = get_lwp_thread (lwp); |
413 | ||
414 | if (debug_threads) | |
415 | debug_printf ("deleting %ld\n", lwpid_of (thr)); | |
416 | ||
417 | remove_thread (thr); | |
466eecee SM |
418 | |
419 | if (the_low_target.delete_thread != NULL) | |
420 | the_low_target.delete_thread (lwp->arch_private); | |
421 | else | |
422 | gdb_assert (lwp->arch_private == NULL); | |
423 | ||
bd99dc85 PA |
424 | free (lwp); |
425 | } | |
426 | ||
95954743 PA |
427 | /* Add a process to the common process list, and set its private |
428 | data. */ | |
429 | ||
430 | static struct process_info * | |
431 | linux_add_process (int pid, int attached) | |
432 | { | |
433 | struct process_info *proc; | |
434 | ||
95954743 | 435 | proc = add_process (pid, attached); |
8d749320 | 436 | proc->priv = XCNEW (struct process_info_private); |
95954743 | 437 | |
aa5ca48f | 438 | if (the_low_target.new_process != NULL) |
fe978cb0 | 439 | proc->priv->arch_private = the_low_target.new_process (); |
aa5ca48f | 440 | |
95954743 PA |
441 | return proc; |
442 | } | |
443 | ||
582511be PA |
444 | static CORE_ADDR get_pc (struct lwp_info *lwp); |
445 | ||
ece66d65 | 446 | /* Call the target arch_setup function on the current thread. */ |
94585166 DB |
447 | |
448 | static void | |
449 | linux_arch_setup (void) | |
450 | { | |
451 | the_low_target.arch_setup (); | |
452 | } | |
453 | ||
454 | /* Call the target arch_setup function on THREAD. */ | |
455 | ||
456 | static void | |
457 | linux_arch_setup_thread (struct thread_info *thread) | |
458 | { | |
459 | struct thread_info *saved_thread; | |
460 | ||
461 | saved_thread = current_thread; | |
462 | current_thread = thread; | |
463 | ||
464 | linux_arch_setup (); | |
465 | ||
466 | current_thread = saved_thread; | |
467 | } | |
468 | ||
469 | /* Handle a GNU/Linux extended wait response. If we see a clone, | |
470 | fork, or vfork event, we need to add the new LWP to our list | |
471 | (and return 0 so as not to report the trap to higher layers). | |
472 | If we see an exec event, we will modify ORIG_EVENT_LWP to point | |
473 | to a new LWP representing the new program. */ | |
0d62e5e8 | 474 | |
de0d863e | 475 | static int |
94585166 | 476 | handle_extended_wait (struct lwp_info **orig_event_lwp, int wstat) |
24a09b5f | 477 | { |
c12a5089 | 478 | client_state &cs = get_client_state (); |
94585166 | 479 | struct lwp_info *event_lwp = *orig_event_lwp; |
89a5711c | 480 | int event = linux_ptrace_get_extended_event (wstat); |
de0d863e | 481 | struct thread_info *event_thr = get_lwp_thread (event_lwp); |
54a0b537 | 482 | struct lwp_info *new_lwp; |
24a09b5f | 483 | |
65706a29 PA |
484 | gdb_assert (event_lwp->waitstatus.kind == TARGET_WAITKIND_IGNORE); |
485 | ||
82075af2 JS |
486 | /* All extended events we currently use are mid-syscall. Only |
487 | PTRACE_EVENT_STOP is delivered more like a signal-stop, but | |
488 | you have to be using PTRACE_SEIZE to get that. */ | |
489 | event_lwp->syscall_state = TARGET_WAITKIND_SYSCALL_ENTRY; | |
490 | ||
c269dbdb DB |
491 | if ((event == PTRACE_EVENT_FORK) || (event == PTRACE_EVENT_VFORK) |
492 | || (event == PTRACE_EVENT_CLONE)) | |
24a09b5f | 493 | { |
95954743 | 494 | ptid_t ptid; |
24a09b5f | 495 | unsigned long new_pid; |
05044653 | 496 | int ret, status; |
24a09b5f | 497 | |
de0d863e | 498 | /* Get the pid of the new lwp. */ |
d86d4aaf | 499 | ptrace (PTRACE_GETEVENTMSG, lwpid_of (event_thr), (PTRACE_TYPE_ARG3) 0, |
56f7af9c | 500 | &new_pid); |
24a09b5f DJ |
501 | |
502 | /* If we haven't already seen the new PID stop, wait for it now. */ | |
05044653 | 503 | if (!pull_pid_from_list (&stopped_pids, new_pid, &status)) |
24a09b5f DJ |
504 | { |
505 | /* The new child has a pending SIGSTOP. We can't affect it until it | |
506 | hits the SIGSTOP, but we're already attached. */ | |
507 | ||
97438e3f | 508 | ret = my_waitpid (new_pid, &status, __WALL); |
24a09b5f DJ |
509 | |
510 | if (ret == -1) | |
511 | perror_with_name ("waiting for new child"); | |
512 | else if (ret != new_pid) | |
513 | warning ("wait returned unexpected PID %d", ret); | |
da5898ce | 514 | else if (!WIFSTOPPED (status)) |
24a09b5f DJ |
515 | warning ("wait returned unexpected status 0x%x", status); |
516 | } | |
517 | ||
c269dbdb | 518 | if (event == PTRACE_EVENT_FORK || event == PTRACE_EVENT_VFORK) |
de0d863e DB |
519 | { |
520 | struct process_info *parent_proc; | |
521 | struct process_info *child_proc; | |
522 | struct lwp_info *child_lwp; | |
bfacd19d | 523 | struct thread_info *child_thr; |
de0d863e DB |
524 | struct target_desc *tdesc; |
525 | ||
fd79271b | 526 | ptid = ptid_t (new_pid, new_pid, 0); |
de0d863e DB |
527 | |
528 | if (debug_threads) | |
529 | { | |
530 | debug_printf ("HEW: Got fork event from LWP %ld, " | |
531 | "new child is %d\n", | |
e38504b3 | 532 | ptid_of (event_thr).lwp (), |
e99b03dc | 533 | ptid.pid ()); |
de0d863e DB |
534 | } |
535 | ||
536 | /* Add the new process to the tables and clone the breakpoint | |
537 | lists of the parent. We need to do this even if the new process | |
538 | will be detached, since we will need the process object and the | |
539 | breakpoints to remove any breakpoints from memory when we | |
540 | detach, and the client side will access registers. */ | |
541 | child_proc = linux_add_process (new_pid, 0); | |
542 | gdb_assert (child_proc != NULL); | |
543 | child_lwp = add_lwp (ptid); | |
544 | gdb_assert (child_lwp != NULL); | |
545 | child_lwp->stopped = 1; | |
bfacd19d DB |
546 | child_lwp->must_set_ptrace_flags = 1; |
547 | child_lwp->status_pending_p = 0; | |
548 | child_thr = get_lwp_thread (child_lwp); | |
549 | child_thr->last_resume_kind = resume_stop; | |
998d452a PA |
550 | child_thr->last_status.kind = TARGET_WAITKIND_STOPPED; |
551 | ||
863d01bd | 552 | /* If we're suspending all threads, leave this one suspended |
0f8288ae YQ |
553 | too. If the fork/clone parent is stepping over a breakpoint, |
554 | all other threads have been suspended already. Leave the | |
555 | child suspended too. */ | |
556 | if (stopping_threads == STOPPING_AND_SUSPENDING_THREADS | |
557 | || event_lwp->bp_reinsert != 0) | |
863d01bd PA |
558 | { |
559 | if (debug_threads) | |
560 | debug_printf ("HEW: leaving child suspended\n"); | |
561 | child_lwp->suspended = 1; | |
562 | } | |
563 | ||
de0d863e DB |
564 | parent_proc = get_thread_process (event_thr); |
565 | child_proc->attached = parent_proc->attached; | |
2e7b624b YQ |
566 | |
567 | if (event_lwp->bp_reinsert != 0 | |
568 | && can_software_single_step () | |
569 | && event == PTRACE_EVENT_VFORK) | |
570 | { | |
3b9a79ef YQ |
571 | /* If we leave single-step breakpoints there, child will |
572 | hit it, so uninsert single-step breakpoints from parent | |
2e7b624b YQ |
573 | (and child). Once vfork child is done, reinsert |
574 | them back to parent. */ | |
3b9a79ef | 575 | uninsert_single_step_breakpoints (event_thr); |
2e7b624b YQ |
576 | } |
577 | ||
63c40ec7 | 578 | clone_all_breakpoints (child_thr, event_thr); |
de0d863e | 579 | |
cc397f3a | 580 | tdesc = allocate_target_description (); |
de0d863e DB |
581 | copy_target_description (tdesc, parent_proc->tdesc); |
582 | child_proc->tdesc = tdesc; | |
de0d863e | 583 | |
3a8a0396 DB |
584 | /* Clone arch-specific process data. */ |
585 | if (the_low_target.new_fork != NULL) | |
586 | the_low_target.new_fork (parent_proc, child_proc); | |
587 | ||
de0d863e | 588 | /* Save fork info in the parent thread. */ |
c269dbdb DB |
589 | if (event == PTRACE_EVENT_FORK) |
590 | event_lwp->waitstatus.kind = TARGET_WAITKIND_FORKED; | |
591 | else if (event == PTRACE_EVENT_VFORK) | |
592 | event_lwp->waitstatus.kind = TARGET_WAITKIND_VFORKED; | |
593 | ||
de0d863e | 594 | event_lwp->waitstatus.value.related_pid = ptid; |
c269dbdb | 595 | |
de0d863e DB |
596 | /* The status_pending field contains bits denoting the |
597 | extended event, so when the pending event is handled, | |
598 | the handler will look at lwp->waitstatus. */ | |
599 | event_lwp->status_pending_p = 1; | |
600 | event_lwp->status_pending = wstat; | |
601 | ||
5a04c4cf PA |
602 | /* Link the threads until the parent event is passed on to |
603 | higher layers. */ | |
604 | event_lwp->fork_relative = child_lwp; | |
605 | child_lwp->fork_relative = event_lwp; | |
606 | ||
3b9a79ef YQ |
607 | /* If the parent thread is doing step-over with single-step |
608 | breakpoints, the list of single-step breakpoints are cloned | |
2e7b624b YQ |
609 | from the parent's. Remove them from the child process. |
610 | In case of vfork, we'll reinsert them back once vforked | |
611 | child is done. */ | |
8a81c5d7 | 612 | if (event_lwp->bp_reinsert != 0 |
2e7b624b | 613 | && can_software_single_step ()) |
8a81c5d7 | 614 | { |
8a81c5d7 YQ |
615 | /* The child process is forked and stopped, so it is safe |
616 | to access its memory without stopping all other threads | |
617 | from other processes. */ | |
3b9a79ef | 618 | delete_single_step_breakpoints (child_thr); |
8a81c5d7 | 619 | |
3b9a79ef YQ |
620 | gdb_assert (has_single_step_breakpoints (event_thr)); |
621 | gdb_assert (!has_single_step_breakpoints (child_thr)); | |
8a81c5d7 YQ |
622 | } |
623 | ||
de0d863e DB |
624 | /* Report the event. */ |
625 | return 0; | |
626 | } | |
627 | ||
fa96cb38 PA |
628 | if (debug_threads) |
629 | debug_printf ("HEW: Got clone event " | |
630 | "from LWP %ld, new child is LWP %ld\n", | |
631 | lwpid_of (event_thr), new_pid); | |
632 | ||
fd79271b | 633 | ptid = ptid_t (pid_of (event_thr), new_pid, 0); |
b3312d80 | 634 | new_lwp = add_lwp (ptid); |
24a09b5f | 635 | |
e27d73f6 DE |
636 | /* Either we're going to immediately resume the new thread |
637 | or leave it stopped. linux_resume_one_lwp is a nop if it | |
638 | thinks the thread is currently running, so set this first | |
639 | before calling linux_resume_one_lwp. */ | |
640 | new_lwp->stopped = 1; | |
641 | ||
0f8288ae YQ |
642 | /* If we're suspending all threads, leave this one suspended |
643 | too. If the fork/clone parent is stepping over a breakpoint, | |
644 | all other threads have been suspended already. Leave the | |
645 | child suspended too. */ | |
646 | if (stopping_threads == STOPPING_AND_SUSPENDING_THREADS | |
647 | || event_lwp->bp_reinsert != 0) | |
bde24c0a PA |
648 | new_lwp->suspended = 1; |
649 | ||
da5898ce DJ |
650 | /* Normally we will get the pending SIGSTOP. But in some cases |
651 | we might get another signal delivered to the group first. | |
f21cc1a2 | 652 | If we do get another signal, be sure not to lose it. */ |
20ba1ce6 | 653 | if (WSTOPSIG (status) != SIGSTOP) |
da5898ce | 654 | { |
54a0b537 | 655 | new_lwp->stop_expected = 1; |
20ba1ce6 PA |
656 | new_lwp->status_pending_p = 1; |
657 | new_lwp->status_pending = status; | |
da5898ce | 658 | } |
c12a5089 | 659 | else if (cs.report_thread_events) |
65706a29 PA |
660 | { |
661 | new_lwp->waitstatus.kind = TARGET_WAITKIND_THREAD_CREATED; | |
662 | new_lwp->status_pending_p = 1; | |
663 | new_lwp->status_pending = status; | |
664 | } | |
de0d863e | 665 | |
a0aad537 | 666 | #ifdef USE_THREAD_DB |
94c207e0 | 667 | thread_db_notice_clone (event_thr, ptid); |
a0aad537 | 668 | #endif |
86299109 | 669 | |
de0d863e DB |
670 | /* Don't report the event. */ |
671 | return 1; | |
24a09b5f | 672 | } |
c269dbdb DB |
673 | else if (event == PTRACE_EVENT_VFORK_DONE) |
674 | { | |
675 | event_lwp->waitstatus.kind = TARGET_WAITKIND_VFORK_DONE; | |
676 | ||
2e7b624b YQ |
677 | if (event_lwp->bp_reinsert != 0 && can_software_single_step ()) |
678 | { | |
3b9a79ef | 679 | reinsert_single_step_breakpoints (event_thr); |
2e7b624b | 680 | |
3b9a79ef | 681 | gdb_assert (has_single_step_breakpoints (event_thr)); |
2e7b624b YQ |
682 | } |
683 | ||
c269dbdb DB |
684 | /* Report the event. */ |
685 | return 0; | |
686 | } | |
c12a5089 | 687 | else if (event == PTRACE_EVENT_EXEC && cs.report_exec_events) |
94585166 DB |
688 | { |
689 | struct process_info *proc; | |
f27866ba | 690 | std::vector<int> syscalls_to_catch; |
94585166 DB |
691 | ptid_t event_ptid; |
692 | pid_t event_pid; | |
693 | ||
694 | if (debug_threads) | |
695 | { | |
696 | debug_printf ("HEW: Got exec event from LWP %ld\n", | |
697 | lwpid_of (event_thr)); | |
698 | } | |
699 | ||
700 | /* Get the event ptid. */ | |
701 | event_ptid = ptid_of (event_thr); | |
e99b03dc | 702 | event_pid = event_ptid.pid (); |
94585166 | 703 | |
82075af2 | 704 | /* Save the syscall list from the execing process. */ |
94585166 | 705 | proc = get_thread_process (event_thr); |
f27866ba | 706 | syscalls_to_catch = std::move (proc->syscalls_to_catch); |
82075af2 JS |
707 | |
708 | /* Delete the execing process and all its threads. */ | |
94585166 DB |
709 | linux_mourn (proc); |
710 | current_thread = NULL; | |
711 | ||
712 | /* Create a new process/lwp/thread. */ | |
713 | proc = linux_add_process (event_pid, 0); | |
714 | event_lwp = add_lwp (event_ptid); | |
715 | event_thr = get_lwp_thread (event_lwp); | |
716 | gdb_assert (current_thread == event_thr); | |
717 | linux_arch_setup_thread (event_thr); | |
718 | ||
719 | /* Set the event status. */ | |
720 | event_lwp->waitstatus.kind = TARGET_WAITKIND_EXECD; | |
721 | event_lwp->waitstatus.value.execd_pathname | |
722 | = xstrdup (linux_proc_pid_to_exec_file (lwpid_of (event_thr))); | |
723 | ||
724 | /* Mark the exec status as pending. */ | |
725 | event_lwp->stopped = 1; | |
726 | event_lwp->status_pending_p = 1; | |
727 | event_lwp->status_pending = wstat; | |
728 | event_thr->last_resume_kind = resume_continue; | |
729 | event_thr->last_status.kind = TARGET_WAITKIND_IGNORE; | |
730 | ||
82075af2 JS |
731 | /* Update syscall state in the new lwp, effectively mid-syscall too. */ |
732 | event_lwp->syscall_state = TARGET_WAITKIND_SYSCALL_ENTRY; | |
733 | ||
734 | /* Restore the list to catch. Don't rely on the client, which is free | |
735 | to avoid sending a new list when the architecture doesn't change. | |
736 | Also, for ANY_SYSCALL, the architecture doesn't really matter. */ | |
f27866ba | 737 | proc->syscalls_to_catch = std::move (syscalls_to_catch); |
82075af2 | 738 | |
94585166 DB |
739 | /* Report the event. */ |
740 | *orig_event_lwp = event_lwp; | |
741 | return 0; | |
742 | } | |
de0d863e DB |
743 | |
744 | internal_error (__FILE__, __LINE__, _("unknown ptrace event %d"), event); | |
24a09b5f DJ |
745 | } |
746 | ||
d50171e4 PA |
747 | /* Return the PC as read from the regcache of LWP, without any |
748 | adjustment. */ | |
749 | ||
750 | static CORE_ADDR | |
751 | get_pc (struct lwp_info *lwp) | |
752 | { | |
0bfdf32f | 753 | struct thread_info *saved_thread; |
d50171e4 PA |
754 | struct regcache *regcache; |
755 | CORE_ADDR pc; | |
756 | ||
757 | if (the_low_target.get_pc == NULL) | |
758 | return 0; | |
759 | ||
0bfdf32f GB |
760 | saved_thread = current_thread; |
761 | current_thread = get_lwp_thread (lwp); | |
d50171e4 | 762 | |
0bfdf32f | 763 | regcache = get_thread_regcache (current_thread, 1); |
d50171e4 PA |
764 | pc = (*the_low_target.get_pc) (regcache); |
765 | ||
766 | if (debug_threads) | |
87ce2a04 | 767 | debug_printf ("pc is 0x%lx\n", (long) pc); |
d50171e4 | 768 | |
0bfdf32f | 769 | current_thread = saved_thread; |
d50171e4 PA |
770 | return pc; |
771 | } | |
772 | ||
82075af2 | 773 | /* This function should only be called if LWP got a SYSCALL_SIGTRAP. |
4cc32bec | 774 | Fill *SYSNO with the syscall nr trapped. */ |
82075af2 JS |
775 | |
776 | static void | |
4cc32bec | 777 | get_syscall_trapinfo (struct lwp_info *lwp, int *sysno) |
82075af2 JS |
778 | { |
779 | struct thread_info *saved_thread; | |
780 | struct regcache *regcache; | |
781 | ||
782 | if (the_low_target.get_syscall_trapinfo == NULL) | |
783 | { | |
784 | /* If we cannot get the syscall trapinfo, report an unknown | |
4cc32bec | 785 | system call number. */ |
82075af2 | 786 | *sysno = UNKNOWN_SYSCALL; |
82075af2 JS |
787 | return; |
788 | } | |
789 | ||
790 | saved_thread = current_thread; | |
791 | current_thread = get_lwp_thread (lwp); | |
792 | ||
793 | regcache = get_thread_regcache (current_thread, 1); | |
4cc32bec | 794 | (*the_low_target.get_syscall_trapinfo) (regcache, sysno); |
82075af2 JS |
795 | |
796 | if (debug_threads) | |
4cc32bec | 797 | debug_printf ("get_syscall_trapinfo sysno %d\n", *sysno); |
82075af2 JS |
798 | |
799 | current_thread = saved_thread; | |
800 | } | |
801 | ||
e7ad2f14 | 802 | static int check_stopped_by_watchpoint (struct lwp_info *child); |
0d62e5e8 | 803 | |
e7ad2f14 PA |
804 | /* Called when the LWP stopped for a signal/trap. If it stopped for a |
805 | trap check what caused it (breakpoint, watchpoint, trace, etc.), | |
806 | and save the result in the LWP's stop_reason field. If it stopped | |
807 | for a breakpoint, decrement the PC if necessary on the lwp's | |
808 | architecture. Returns true if we now have the LWP's stop PC. */ | |
0d62e5e8 | 809 | |
582511be | 810 | static int |
e7ad2f14 | 811 | save_stop_reason (struct lwp_info *lwp) |
0d62e5e8 | 812 | { |
582511be PA |
813 | CORE_ADDR pc; |
814 | CORE_ADDR sw_breakpoint_pc; | |
815 | struct thread_info *saved_thread; | |
3e572f71 PA |
816 | #if USE_SIGTRAP_SIGINFO |
817 | siginfo_t siginfo; | |
818 | #endif | |
d50171e4 PA |
819 | |
820 | if (the_low_target.get_pc == NULL) | |
821 | return 0; | |
0d62e5e8 | 822 | |
582511be PA |
823 | pc = get_pc (lwp); |
824 | sw_breakpoint_pc = pc - the_low_target.decr_pc_after_break; | |
d50171e4 | 825 | |
582511be PA |
826 | /* breakpoint_at reads from the current thread. */ |
827 | saved_thread = current_thread; | |
828 | current_thread = get_lwp_thread (lwp); | |
47c0c975 | 829 | |
3e572f71 PA |
830 | #if USE_SIGTRAP_SIGINFO |
831 | if (ptrace (PTRACE_GETSIGINFO, lwpid_of (current_thread), | |
832 | (PTRACE_TYPE_ARG3) 0, &siginfo) == 0) | |
833 | { | |
834 | if (siginfo.si_signo == SIGTRAP) | |
835 | { | |
e7ad2f14 PA |
836 | if (GDB_ARCH_IS_TRAP_BRKPT (siginfo.si_code) |
837 | && GDB_ARCH_IS_TRAP_HWBKPT (siginfo.si_code)) | |
3e572f71 | 838 | { |
e7ad2f14 PA |
839 | /* The si_code is ambiguous on this arch -- check debug |
840 | registers. */ | |
841 | if (!check_stopped_by_watchpoint (lwp)) | |
842 | lwp->stop_reason = TARGET_STOPPED_BY_SW_BREAKPOINT; | |
843 | } | |
844 | else if (GDB_ARCH_IS_TRAP_BRKPT (siginfo.si_code)) | |
845 | { | |
846 | /* If we determine the LWP stopped for a SW breakpoint, | |
847 | trust it. Particularly don't check watchpoint | |
848 | registers, because at least on s390, we'd find | |
849 | stopped-by-watchpoint as long as there's a watchpoint | |
850 | set. */ | |
3e572f71 | 851 | lwp->stop_reason = TARGET_STOPPED_BY_SW_BREAKPOINT; |
3e572f71 | 852 | } |
e7ad2f14 | 853 | else if (GDB_ARCH_IS_TRAP_HWBKPT (siginfo.si_code)) |
3e572f71 | 854 | { |
e7ad2f14 PA |
855 | /* This can indicate either a hardware breakpoint or |
856 | hardware watchpoint. Check debug registers. */ | |
857 | if (!check_stopped_by_watchpoint (lwp)) | |
858 | lwp->stop_reason = TARGET_STOPPED_BY_HW_BREAKPOINT; | |
3e572f71 | 859 | } |
2bf6fb9d PA |
860 | else if (siginfo.si_code == TRAP_TRACE) |
861 | { | |
e7ad2f14 PA |
862 | /* We may have single stepped an instruction that |
863 | triggered a watchpoint. In that case, on some | |
864 | architectures (such as x86), instead of TRAP_HWBKPT, | |
865 | si_code indicates TRAP_TRACE, and we need to check | |
866 | the debug registers separately. */ | |
867 | if (!check_stopped_by_watchpoint (lwp)) | |
868 | lwp->stop_reason = TARGET_STOPPED_BY_SINGLE_STEP; | |
2bf6fb9d | 869 | } |
3e572f71 PA |
870 | } |
871 | } | |
872 | #else | |
582511be PA |
873 | /* We may have just stepped a breakpoint instruction. E.g., in |
874 | non-stop mode, GDB first tells the thread A to step a range, and | |
875 | then the user inserts a breakpoint inside the range. In that | |
8090aef2 PA |
876 | case we need to report the breakpoint PC. */ |
877 | if ((!lwp->stepping || lwp->stop_pc == sw_breakpoint_pc) | |
582511be | 878 | && (*the_low_target.breakpoint_at) (sw_breakpoint_pc)) |
e7ad2f14 PA |
879 | lwp->stop_reason = TARGET_STOPPED_BY_SW_BREAKPOINT; |
880 | ||
881 | if (hardware_breakpoint_inserted_here (pc)) | |
882 | lwp->stop_reason = TARGET_STOPPED_BY_HW_BREAKPOINT; | |
883 | ||
884 | if (lwp->stop_reason == TARGET_STOPPED_BY_NO_REASON) | |
885 | check_stopped_by_watchpoint (lwp); | |
886 | #endif | |
887 | ||
888 | if (lwp->stop_reason == TARGET_STOPPED_BY_SW_BREAKPOINT) | |
582511be PA |
889 | { |
890 | if (debug_threads) | |
891 | { | |
892 | struct thread_info *thr = get_lwp_thread (lwp); | |
893 | ||
894 | debug_printf ("CSBB: %s stopped by software breakpoint\n", | |
895 | target_pid_to_str (ptid_of (thr))); | |
896 | } | |
897 | ||
898 | /* Back up the PC if necessary. */ | |
899 | if (pc != sw_breakpoint_pc) | |
e7ad2f14 | 900 | { |
582511be PA |
901 | struct regcache *regcache |
902 | = get_thread_regcache (current_thread, 1); | |
903 | (*the_low_target.set_pc) (regcache, sw_breakpoint_pc); | |
904 | } | |
905 | ||
e7ad2f14 PA |
906 | /* Update this so we record the correct stop PC below. */ |
907 | pc = sw_breakpoint_pc; | |
582511be | 908 | } |
e7ad2f14 | 909 | else if (lwp->stop_reason == TARGET_STOPPED_BY_HW_BREAKPOINT) |
582511be PA |
910 | { |
911 | if (debug_threads) | |
912 | { | |
913 | struct thread_info *thr = get_lwp_thread (lwp); | |
914 | ||
915 | debug_printf ("CSBB: %s stopped by hardware breakpoint\n", | |
916 | target_pid_to_str (ptid_of (thr))); | |
917 | } | |
e7ad2f14 PA |
918 | } |
919 | else if (lwp->stop_reason == TARGET_STOPPED_BY_WATCHPOINT) | |
920 | { | |
921 | if (debug_threads) | |
922 | { | |
923 | struct thread_info *thr = get_lwp_thread (lwp); | |
47c0c975 | 924 | |
e7ad2f14 PA |
925 | debug_printf ("CSBB: %s stopped by hardware watchpoint\n", |
926 | target_pid_to_str (ptid_of (thr))); | |
927 | } | |
582511be | 928 | } |
e7ad2f14 PA |
929 | else if (lwp->stop_reason == TARGET_STOPPED_BY_SINGLE_STEP) |
930 | { | |
931 | if (debug_threads) | |
932 | { | |
933 | struct thread_info *thr = get_lwp_thread (lwp); | |
582511be | 934 | |
e7ad2f14 PA |
935 | debug_printf ("CSBB: %s stopped by trace\n", |
936 | target_pid_to_str (ptid_of (thr))); | |
937 | } | |
938 | } | |
939 | ||
940 | lwp->stop_pc = pc; | |
582511be | 941 | current_thread = saved_thread; |
e7ad2f14 | 942 | return 1; |
0d62e5e8 | 943 | } |
ce3a066d | 944 | |
b3312d80 | 945 | static struct lwp_info * |
95954743 | 946 | add_lwp (ptid_t ptid) |
611cb4a5 | 947 | { |
54a0b537 | 948 | struct lwp_info *lwp; |
0d62e5e8 | 949 | |
8d749320 | 950 | lwp = XCNEW (struct lwp_info); |
00db26fa PA |
951 | |
952 | lwp->waitstatus.kind = TARGET_WAITKIND_IGNORE; | |
0d62e5e8 | 953 | |
aa5ca48f | 954 | if (the_low_target.new_thread != NULL) |
34c703da | 955 | the_low_target.new_thread (lwp); |
aa5ca48f | 956 | |
f7667f0d | 957 | lwp->thread = add_thread (ptid, lwp); |
0d62e5e8 | 958 | |
54a0b537 | 959 | return lwp; |
0d62e5e8 | 960 | } |
611cb4a5 | 961 | |
2090129c SDJ |
962 | /* Callback to be used when calling fork_inferior, responsible for |
963 | actually initiating the tracing of the inferior. */ | |
964 | ||
965 | static void | |
966 | linux_ptrace_fun () | |
967 | { | |
968 | if (ptrace (PTRACE_TRACEME, 0, (PTRACE_TYPE_ARG3) 0, | |
969 | (PTRACE_TYPE_ARG4) 0) < 0) | |
970 | trace_start_error_with_name ("ptrace"); | |
971 | ||
972 | if (setpgid (0, 0) < 0) | |
973 | trace_start_error_with_name ("setpgid"); | |
974 | ||
975 | /* If GDBserver is connected to gdb via stdio, redirect the inferior's | |
976 | stdout to stderr so that inferior i/o doesn't corrupt the connection. | |
977 | Also, redirect stdin to /dev/null. */ | |
978 | if (remote_connection_is_stdio ()) | |
979 | { | |
980 | if (close (0) < 0) | |
981 | trace_start_error_with_name ("close"); | |
982 | if (open ("/dev/null", O_RDONLY) < 0) | |
983 | trace_start_error_with_name ("open"); | |
984 | if (dup2 (2, 1) < 0) | |
985 | trace_start_error_with_name ("dup2"); | |
986 | if (write (2, "stdin/stdout redirected\n", | |
987 | sizeof ("stdin/stdout redirected\n") - 1) < 0) | |
988 | { | |
989 | /* Errors ignored. */; | |
990 | } | |
991 | } | |
992 | } | |
993 | ||
da6d8c04 | 994 | /* Start an inferior process and returns its pid. |
2090129c SDJ |
995 | PROGRAM is the name of the program to be started, and PROGRAM_ARGS |
996 | are its arguments. */ | |
da6d8c04 | 997 | |
ce3a066d | 998 | static int |
2090129c SDJ |
999 | linux_create_inferior (const char *program, |
1000 | const std::vector<char *> &program_args) | |
da6d8c04 | 1001 | { |
c12a5089 | 1002 | client_state &cs = get_client_state (); |
a6dbe5df | 1003 | struct lwp_info *new_lwp; |
da6d8c04 | 1004 | int pid; |
95954743 | 1005 | ptid_t ptid; |
03583c20 | 1006 | |
41272101 TT |
1007 | { |
1008 | maybe_disable_address_space_randomization restore_personality | |
c12a5089 | 1009 | (cs.disable_randomization); |
41272101 TT |
1010 | std::string str_program_args = stringify_argv (program_args); |
1011 | ||
1012 | pid = fork_inferior (program, | |
1013 | str_program_args.c_str (), | |
1014 | get_environ ()->envp (), linux_ptrace_fun, | |
1015 | NULL, NULL, NULL, NULL); | |
1016 | } | |
03583c20 | 1017 | |
55d7b841 | 1018 | linux_add_process (pid, 0); |
95954743 | 1019 | |
fd79271b | 1020 | ptid = ptid_t (pid, pid, 0); |
95954743 | 1021 | new_lwp = add_lwp (ptid); |
a6dbe5df | 1022 | new_lwp->must_set_ptrace_flags = 1; |
611cb4a5 | 1023 | |
2090129c SDJ |
1024 | post_fork_inferior (pid, program); |
1025 | ||
a9fa9f7d | 1026 | return pid; |
da6d8c04 DJ |
1027 | } |
1028 | ||
ece66d65 JS |
1029 | /* Implement the post_create_inferior target_ops method. */ |
1030 | ||
1031 | static void | |
1032 | linux_post_create_inferior (void) | |
1033 | { | |
1034 | struct lwp_info *lwp = get_thread_lwp (current_thread); | |
1035 | ||
1036 | linux_arch_setup (); | |
1037 | ||
1038 | if (lwp->must_set_ptrace_flags) | |
1039 | { | |
1040 | struct process_info *proc = current_process (); | |
1041 | int options = linux_low_ptrace_options (proc->attached); | |
1042 | ||
1043 | linux_enable_event_reporting (lwpid_of (current_thread), options); | |
1044 | lwp->must_set_ptrace_flags = 0; | |
1045 | } | |
1046 | } | |
1047 | ||
8784d563 PA |
1048 | /* Attach to an inferior process. Returns 0 on success, ERRNO on |
1049 | error. */ | |
da6d8c04 | 1050 | |
7ae1a6a6 PA |
1051 | int |
1052 | linux_attach_lwp (ptid_t ptid) | |
da6d8c04 | 1053 | { |
54a0b537 | 1054 | struct lwp_info *new_lwp; |
e38504b3 | 1055 | int lwpid = ptid.lwp (); |
611cb4a5 | 1056 | |
b8e1b30e | 1057 | if (ptrace (PTRACE_ATTACH, lwpid, (PTRACE_TYPE_ARG3) 0, (PTRACE_TYPE_ARG4) 0) |
56f7af9c | 1058 | != 0) |
7ae1a6a6 | 1059 | return errno; |
24a09b5f | 1060 | |
b3312d80 | 1061 | new_lwp = add_lwp (ptid); |
0d62e5e8 | 1062 | |
a6dbe5df PA |
1063 | /* We need to wait for SIGSTOP before being able to make the next |
1064 | ptrace call on this LWP. */ | |
1065 | new_lwp->must_set_ptrace_flags = 1; | |
1066 | ||
644cebc9 | 1067 | if (linux_proc_pid_is_stopped (lwpid)) |
c14d7ab2 PA |
1068 | { |
1069 | if (debug_threads) | |
87ce2a04 | 1070 | debug_printf ("Attached to a stopped process\n"); |
c14d7ab2 PA |
1071 | |
1072 | /* The process is definitely stopped. It is in a job control | |
1073 | stop, unless the kernel predates the TASK_STOPPED / | |
1074 | TASK_TRACED distinction, in which case it might be in a | |
1075 | ptrace stop. Make sure it is in a ptrace stop; from there we | |
1076 | can kill it, signal it, et cetera. | |
1077 | ||
1078 | First make sure there is a pending SIGSTOP. Since we are | |
1079 | already attached, the process can not transition from stopped | |
1080 | to running without a PTRACE_CONT; so we know this signal will | |
1081 | go into the queue. The SIGSTOP generated by PTRACE_ATTACH is | |
1082 | probably already in the queue (unless this kernel is old | |
1083 | enough to use TASK_STOPPED for ptrace stops); but since | |
1084 | SIGSTOP is not an RT signal, it can only be queued once. */ | |
1085 | kill_lwp (lwpid, SIGSTOP); | |
1086 | ||
1087 | /* Finally, resume the stopped process. This will deliver the | |
1088 | SIGSTOP (or a higher priority signal, just like normal | |
1089 | PTRACE_ATTACH), which we'll catch later on. */ | |
b8e1b30e | 1090 | ptrace (PTRACE_CONT, lwpid, (PTRACE_TYPE_ARG3) 0, (PTRACE_TYPE_ARG4) 0); |
c14d7ab2 PA |
1091 | } |
1092 | ||
0d62e5e8 | 1093 | /* The next time we wait for this LWP we'll see a SIGSTOP as PTRACE_ATTACH |
0e21c1ec DE |
1094 | brings it to a halt. |
1095 | ||
1096 | There are several cases to consider here: | |
1097 | ||
1098 | 1) gdbserver has already attached to the process and is being notified | |
1b3f6016 | 1099 | of a new thread that is being created. |
d50171e4 PA |
1100 | In this case we should ignore that SIGSTOP and resume the |
1101 | process. This is handled below by setting stop_expected = 1, | |
8336d594 | 1102 | and the fact that add_thread sets last_resume_kind == |
d50171e4 | 1103 | resume_continue. |
0e21c1ec DE |
1104 | |
1105 | 2) This is the first thread (the process thread), and we're attaching | |
1b3f6016 PA |
1106 | to it via attach_inferior. |
1107 | In this case we want the process thread to stop. | |
d50171e4 PA |
1108 | This is handled by having linux_attach set last_resume_kind == |
1109 | resume_stop after we return. | |
e3deef73 LM |
1110 | |
1111 | If the pid we are attaching to is also the tgid, we attach to and | |
1112 | stop all the existing threads. Otherwise, we attach to pid and | |
1113 | ignore any other threads in the same group as this pid. | |
0e21c1ec DE |
1114 | |
1115 | 3) GDB is connecting to gdbserver and is requesting an enumeration of all | |
1b3f6016 PA |
1116 | existing threads. |
1117 | In this case we want the thread to stop. | |
1118 | FIXME: This case is currently not properly handled. | |
1119 | We should wait for the SIGSTOP but don't. Things work apparently | |
1120 | because enough time passes between when we ptrace (ATTACH) and when | |
1121 | gdb makes the next ptrace call on the thread. | |
0d62e5e8 DJ |
1122 | |
1123 | On the other hand, if we are currently trying to stop all threads, we | |
1124 | should treat the new thread as if we had sent it a SIGSTOP. This works | |
54a0b537 | 1125 | because we are guaranteed that the add_lwp call above added us to the |
0e21c1ec DE |
1126 | end of the list, and so the new thread has not yet reached |
1127 | wait_for_sigstop (but will). */ | |
d50171e4 | 1128 | new_lwp->stop_expected = 1; |
0d62e5e8 | 1129 | |
7ae1a6a6 | 1130 | return 0; |
95954743 PA |
1131 | } |
1132 | ||
8784d563 PA |
1133 | /* Callback for linux_proc_attach_tgid_threads. Attach to PTID if not |
1134 | already attached. Returns true if a new LWP is found, false | |
1135 | otherwise. */ | |
1136 | ||
1137 | static int | |
1138 | attach_proc_task_lwp_callback (ptid_t ptid) | |
1139 | { | |
1140 | /* Is this a new thread? */ | |
1141 | if (find_thread_ptid (ptid) == NULL) | |
1142 | { | |
e38504b3 | 1143 | int lwpid = ptid.lwp (); |
8784d563 PA |
1144 | int err; |
1145 | ||
1146 | if (debug_threads) | |
1147 | debug_printf ("Found new lwp %d\n", lwpid); | |
1148 | ||
1149 | err = linux_attach_lwp (ptid); | |
1150 | ||
1151 | /* Be quiet if we simply raced with the thread exiting. EPERM | |
1152 | is returned if the thread's task still exists, and is marked | |
1153 | as exited or zombie, as well as other conditions, so in that | |
1154 | case, confirm the status in /proc/PID/status. */ | |
1155 | if (err == ESRCH | |
1156 | || (err == EPERM && linux_proc_pid_is_gone (lwpid))) | |
1157 | { | |
1158 | if (debug_threads) | |
1159 | { | |
1160 | debug_printf ("Cannot attach to lwp %d: " | |
1161 | "thread is gone (%d: %s)\n", | |
1162 | lwpid, err, strerror (err)); | |
1163 | } | |
1164 | } | |
1165 | else if (err != 0) | |
1166 | { | |
4d9b86e1 SM |
1167 | std::string reason |
1168 | = linux_ptrace_attach_fail_reason_string (ptid, err); | |
1169 | ||
1170 | warning (_("Cannot attach to lwp %d: %s"), lwpid, reason.c_str ()); | |
8784d563 PA |
1171 | } |
1172 | ||
1173 | return 1; | |
1174 | } | |
1175 | return 0; | |
1176 | } | |
1177 | ||
500c1d85 PA |
1178 | static void async_file_mark (void); |
1179 | ||
e3deef73 LM |
1180 | /* Attach to PID. If PID is the tgid, attach to it and all |
1181 | of its threads. */ | |
1182 | ||
c52daf70 | 1183 | static int |
a1928bad | 1184 | linux_attach (unsigned long pid) |
0d62e5e8 | 1185 | { |
500c1d85 PA |
1186 | struct process_info *proc; |
1187 | struct thread_info *initial_thread; | |
fd79271b | 1188 | ptid_t ptid = ptid_t (pid, pid, 0); |
7ae1a6a6 PA |
1189 | int err; |
1190 | ||
e3deef73 LM |
1191 | /* Attach to PID. We will check for other threads |
1192 | soon. */ | |
7ae1a6a6 PA |
1193 | err = linux_attach_lwp (ptid); |
1194 | if (err != 0) | |
4d9b86e1 SM |
1195 | { |
1196 | std::string reason = linux_ptrace_attach_fail_reason_string (ptid, err); | |
1197 | ||
1198 | error ("Cannot attach to process %ld: %s", pid, reason.c_str ()); | |
1199 | } | |
7ae1a6a6 | 1200 | |
500c1d85 | 1201 | proc = linux_add_process (pid, 1); |
0d62e5e8 | 1202 | |
500c1d85 PA |
1203 | /* Don't ignore the initial SIGSTOP if we just attached to this |
1204 | process. It will be collected by wait shortly. */ | |
fd79271b | 1205 | initial_thread = find_thread_ptid (ptid_t (pid, pid, 0)); |
500c1d85 | 1206 | initial_thread->last_resume_kind = resume_stop; |
0d62e5e8 | 1207 | |
8784d563 PA |
1208 | /* We must attach to every LWP. If /proc is mounted, use that to |
1209 | find them now. On the one hand, the inferior may be using raw | |
1210 | clone instead of using pthreads. On the other hand, even if it | |
1211 | is using pthreads, GDB may not be connected yet (thread_db needs | |
1212 | to do symbol lookups, through qSymbol). Also, thread_db walks | |
1213 | structures in the inferior's address space to find the list of | |
1214 | threads/LWPs, and those structures may well be corrupted. Note | |
1215 | that once thread_db is loaded, we'll still use it to list threads | |
1216 | and associate pthread info with each LWP. */ | |
1217 | linux_proc_attach_tgid_threads (pid, attach_proc_task_lwp_callback); | |
500c1d85 PA |
1218 | |
1219 | /* GDB will shortly read the xml target description for this | |
1220 | process, to figure out the process' architecture. But the target | |
1221 | description is only filled in when the first process/thread in | |
1222 | the thread group reports its initial PTRACE_ATTACH SIGSTOP. Do | |
1223 | that now, otherwise, if GDB is fast enough, it could read the | |
1224 | target description _before_ that initial stop. */ | |
1225 | if (non_stop) | |
1226 | { | |
1227 | struct lwp_info *lwp; | |
1228 | int wstat, lwpid; | |
f2907e49 | 1229 | ptid_t pid_ptid = ptid_t (pid); |
500c1d85 PA |
1230 | |
1231 | lwpid = linux_wait_for_event_filtered (pid_ptid, pid_ptid, | |
1232 | &wstat, __WALL); | |
1233 | gdb_assert (lwpid > 0); | |
1234 | ||
f2907e49 | 1235 | lwp = find_lwp_pid (ptid_t (lwpid)); |
500c1d85 PA |
1236 | |
1237 | if (!WIFSTOPPED (wstat) || WSTOPSIG (wstat) != SIGSTOP) | |
1238 | { | |
1239 | lwp->status_pending_p = 1; | |
1240 | lwp->status_pending = wstat; | |
1241 | } | |
1242 | ||
1243 | initial_thread->last_resume_kind = resume_continue; | |
1244 | ||
1245 | async_file_mark (); | |
1246 | ||
1247 | gdb_assert (proc->tdesc != NULL); | |
1248 | } | |
1249 | ||
95954743 PA |
1250 | return 0; |
1251 | } | |
1252 | ||
95954743 | 1253 | static int |
e4eb0dec | 1254 | last_thread_of_process_p (int pid) |
95954743 | 1255 | { |
e4eb0dec | 1256 | bool seen_one = false; |
95954743 | 1257 | |
e4eb0dec | 1258 | thread_info *thread = find_thread (pid, [&] (thread_info *thread) |
95954743 | 1259 | { |
e4eb0dec SM |
1260 | if (!seen_one) |
1261 | { | |
1262 | /* This is the first thread of this process we see. */ | |
1263 | seen_one = true; | |
1264 | return false; | |
1265 | } | |
1266 | else | |
1267 | { | |
1268 | /* This is the second thread of this process we see. */ | |
1269 | return true; | |
1270 | } | |
1271 | }); | |
da6d8c04 | 1272 | |
e4eb0dec | 1273 | return thread == NULL; |
95954743 PA |
1274 | } |
1275 | ||
da84f473 PA |
1276 | /* Kill LWP. */ |
1277 | ||
1278 | static void | |
1279 | linux_kill_one_lwp (struct lwp_info *lwp) | |
1280 | { | |
d86d4aaf DE |
1281 | struct thread_info *thr = get_lwp_thread (lwp); |
1282 | int pid = lwpid_of (thr); | |
da84f473 PA |
1283 | |
1284 | /* PTRACE_KILL is unreliable. After stepping into a signal handler, | |
1285 | there is no signal context, and ptrace(PTRACE_KILL) (or | |
1286 | ptrace(PTRACE_CONT, SIGKILL), pretty much the same) acts like | |
1287 | ptrace(CONT, pid, 0,0) and just resumes the tracee. A better | |
1288 | alternative is to kill with SIGKILL. We only need one SIGKILL | |
1289 | per process, not one for each thread. But since we still support | |
4a6ed09b PA |
1290 | support debugging programs using raw clone without CLONE_THREAD, |
1291 | we send one for each thread. For years, we used PTRACE_KILL | |
1292 | only, so we're being a bit paranoid about some old kernels where | |
1293 | PTRACE_KILL might work better (dubious if there are any such, but | |
1294 | that's why it's paranoia), so we try SIGKILL first, PTRACE_KILL | |
1295 | second, and so we're fine everywhere. */ | |
da84f473 PA |
1296 | |
1297 | errno = 0; | |
69ff6be5 | 1298 | kill_lwp (pid, SIGKILL); |
da84f473 | 1299 | if (debug_threads) |
ce9e3fe7 PA |
1300 | { |
1301 | int save_errno = errno; | |
1302 | ||
1303 | debug_printf ("LKL: kill_lwp (SIGKILL) %s, 0, 0 (%s)\n", | |
1304 | target_pid_to_str (ptid_of (thr)), | |
1305 | save_errno ? strerror (save_errno) : "OK"); | |
1306 | } | |
da84f473 PA |
1307 | |
1308 | errno = 0; | |
b8e1b30e | 1309 | ptrace (PTRACE_KILL, pid, (PTRACE_TYPE_ARG3) 0, (PTRACE_TYPE_ARG4) 0); |
da84f473 | 1310 | if (debug_threads) |
ce9e3fe7 PA |
1311 | { |
1312 | int save_errno = errno; | |
1313 | ||
1314 | debug_printf ("LKL: PTRACE_KILL %s, 0, 0 (%s)\n", | |
1315 | target_pid_to_str (ptid_of (thr)), | |
1316 | save_errno ? strerror (save_errno) : "OK"); | |
1317 | } | |
da84f473 PA |
1318 | } |
1319 | ||
e76126e8 PA |
1320 | /* Kill LWP and wait for it to die. */ |
1321 | ||
1322 | static void | |
1323 | kill_wait_lwp (struct lwp_info *lwp) | |
1324 | { | |
1325 | struct thread_info *thr = get_lwp_thread (lwp); | |
e99b03dc | 1326 | int pid = ptid_of (thr).pid (); |
e38504b3 | 1327 | int lwpid = ptid_of (thr).lwp (); |
e76126e8 PA |
1328 | int wstat; |
1329 | int res; | |
1330 | ||
1331 | if (debug_threads) | |
1332 | debug_printf ("kwl: killing lwp %d, for pid: %d\n", lwpid, pid); | |
1333 | ||
1334 | do | |
1335 | { | |
1336 | linux_kill_one_lwp (lwp); | |
1337 | ||
1338 | /* Make sure it died. Notes: | |
1339 | ||
1340 | - The loop is most likely unnecessary. | |
1341 | ||
1342 | - We don't use linux_wait_for_event as that could delete lwps | |
1343 | while we're iterating over them. We're not interested in | |
1344 | any pending status at this point, only in making sure all | |
1345 | wait status on the kernel side are collected until the | |
1346 | process is reaped. | |
1347 | ||
1348 | - We don't use __WALL here as the __WALL emulation relies on | |
1349 | SIGCHLD, and killing a stopped process doesn't generate | |
1350 | one, nor an exit status. | |
1351 | */ | |
1352 | res = my_waitpid (lwpid, &wstat, 0); | |
1353 | if (res == -1 && errno == ECHILD) | |
1354 | res = my_waitpid (lwpid, &wstat, __WCLONE); | |
1355 | } while (res > 0 && WIFSTOPPED (wstat)); | |
1356 | ||
586b02a9 PA |
1357 | /* Even if it was stopped, the child may have already disappeared. |
1358 | E.g., if it was killed by SIGKILL. */ | |
1359 | if (res < 0 && errno != ECHILD) | |
1360 | perror_with_name ("kill_wait_lwp"); | |
e76126e8 PA |
1361 | } |
1362 | ||
578290ec | 1363 | /* Callback for `for_each_thread'. Kills an lwp of a given process, |
da84f473 | 1364 | except the leader. */ |
95954743 | 1365 | |
578290ec SM |
1366 | static void |
1367 | kill_one_lwp_callback (thread_info *thread, int pid) | |
da6d8c04 | 1368 | { |
54a0b537 | 1369 | struct lwp_info *lwp = get_thread_lwp (thread); |
0d62e5e8 | 1370 | |
fd500816 DJ |
1371 | /* We avoid killing the first thread here, because of a Linux kernel (at |
1372 | least 2.6.0-test7 through 2.6.8-rc4) bug; if we kill the parent before | |
1373 | the children get a chance to be reaped, it will remain a zombie | |
1374 | forever. */ | |
95954743 | 1375 | |
d86d4aaf | 1376 | if (lwpid_of (thread) == pid) |
95954743 PA |
1377 | { |
1378 | if (debug_threads) | |
87ce2a04 | 1379 | debug_printf ("lkop: is last of process %s\n", |
9c80ecd6 | 1380 | target_pid_to_str (thread->id)); |
578290ec | 1381 | return; |
95954743 | 1382 | } |
fd500816 | 1383 | |
e76126e8 | 1384 | kill_wait_lwp (lwp); |
da6d8c04 DJ |
1385 | } |
1386 | ||
95954743 | 1387 | static int |
a780ef4f | 1388 | linux_kill (process_info *process) |
0d62e5e8 | 1389 | { |
a780ef4f | 1390 | int pid = process->pid; |
9d606399 | 1391 | |
f9e39928 PA |
1392 | /* If we're killing a running inferior, make sure it is stopped |
1393 | first, as PTRACE_KILL will not work otherwise. */ | |
7984d532 | 1394 | stop_all_lwps (0, NULL); |
f9e39928 | 1395 | |
578290ec SM |
1396 | for_each_thread (pid, [&] (thread_info *thread) |
1397 | { | |
1398 | kill_one_lwp_callback (thread, pid); | |
1399 | }); | |
fd500816 | 1400 | |
54a0b537 | 1401 | /* See the comment in linux_kill_one_lwp. We did not kill the first |
fd500816 | 1402 | thread in the list, so do so now. */ |
a780ef4f | 1403 | lwp_info *lwp = find_lwp_pid (ptid_t (pid)); |
bd99dc85 | 1404 | |
784867a5 | 1405 | if (lwp == NULL) |
fd500816 | 1406 | { |
784867a5 | 1407 | if (debug_threads) |
d86d4aaf DE |
1408 | debug_printf ("lk_1: cannot find lwp for pid: %d\n", |
1409 | pid); | |
784867a5 JK |
1410 | } |
1411 | else | |
e76126e8 | 1412 | kill_wait_lwp (lwp); |
2d717e4f | 1413 | |
8336d594 | 1414 | the_target->mourn (process); |
f9e39928 PA |
1415 | |
1416 | /* Since we presently can only stop all lwps of all processes, we | |
1417 | need to unstop lwps of other processes. */ | |
7984d532 | 1418 | unstop_all_lwps (0, NULL); |
95954743 | 1419 | return 0; |
0d62e5e8 DJ |
1420 | } |
1421 | ||
9b224c5e PA |
1422 | /* Get pending signal of THREAD, for detaching purposes. This is the |
1423 | signal the thread last stopped for, which we need to deliver to the | |
1424 | thread when detaching, otherwise, it'd be suppressed/lost. */ | |
1425 | ||
1426 | static int | |
1427 | get_detach_signal (struct thread_info *thread) | |
1428 | { | |
c12a5089 | 1429 | client_state &cs = get_client_state (); |
a493e3e2 | 1430 | enum gdb_signal signo = GDB_SIGNAL_0; |
9b224c5e PA |
1431 | int status; |
1432 | struct lwp_info *lp = get_thread_lwp (thread); | |
1433 | ||
1434 | if (lp->status_pending_p) | |
1435 | status = lp->status_pending; | |
1436 | else | |
1437 | { | |
1438 | /* If the thread had been suspended by gdbserver, and it stopped | |
1439 | cleanly, then it'll have stopped with SIGSTOP. But we don't | |
1440 | want to deliver that SIGSTOP. */ | |
1441 | if (thread->last_status.kind != TARGET_WAITKIND_STOPPED | |
a493e3e2 | 1442 | || thread->last_status.value.sig == GDB_SIGNAL_0) |
9b224c5e PA |
1443 | return 0; |
1444 | ||
1445 | /* Otherwise, we may need to deliver the signal we | |
1446 | intercepted. */ | |
1447 | status = lp->last_status; | |
1448 | } | |
1449 | ||
1450 | if (!WIFSTOPPED (status)) | |
1451 | { | |
1452 | if (debug_threads) | |
87ce2a04 | 1453 | debug_printf ("GPS: lwp %s hasn't stopped: no pending signal\n", |
d86d4aaf | 1454 | target_pid_to_str (ptid_of (thread))); |
9b224c5e PA |
1455 | return 0; |
1456 | } | |
1457 | ||
1458 | /* Extended wait statuses aren't real SIGTRAPs. */ | |
89a5711c | 1459 | if (WSTOPSIG (status) == SIGTRAP && linux_is_extended_waitstatus (status)) |
9b224c5e PA |
1460 | { |
1461 | if (debug_threads) | |
87ce2a04 DE |
1462 | debug_printf ("GPS: lwp %s had stopped with extended " |
1463 | "status: no pending signal\n", | |
d86d4aaf | 1464 | target_pid_to_str (ptid_of (thread))); |
9b224c5e PA |
1465 | return 0; |
1466 | } | |
1467 | ||
2ea28649 | 1468 | signo = gdb_signal_from_host (WSTOPSIG (status)); |
9b224c5e | 1469 | |
c12a5089 | 1470 | if (cs.program_signals_p && !cs.program_signals[signo]) |
9b224c5e PA |
1471 | { |
1472 | if (debug_threads) | |
87ce2a04 | 1473 | debug_printf ("GPS: lwp %s had signal %s, but it is in nopass state\n", |
d86d4aaf | 1474 | target_pid_to_str (ptid_of (thread)), |
87ce2a04 | 1475 | gdb_signal_to_string (signo)); |
9b224c5e PA |
1476 | return 0; |
1477 | } | |
c12a5089 | 1478 | else if (!cs.program_signals_p |
9b224c5e PA |
1479 | /* If we have no way to know which signals GDB does not |
1480 | want to have passed to the program, assume | |
1481 | SIGTRAP/SIGINT, which is GDB's default. */ | |
a493e3e2 | 1482 | && (signo == GDB_SIGNAL_TRAP || signo == GDB_SIGNAL_INT)) |
9b224c5e PA |
1483 | { |
1484 | if (debug_threads) | |
87ce2a04 DE |
1485 | debug_printf ("GPS: lwp %s had signal %s, " |
1486 | "but we don't know if we should pass it. " | |
1487 | "Default to not.\n", | |
d86d4aaf | 1488 | target_pid_to_str (ptid_of (thread)), |
87ce2a04 | 1489 | gdb_signal_to_string (signo)); |
9b224c5e PA |
1490 | return 0; |
1491 | } | |
1492 | else | |
1493 | { | |
1494 | if (debug_threads) | |
87ce2a04 | 1495 | debug_printf ("GPS: lwp %s has pending signal %s: delivering it.\n", |
d86d4aaf | 1496 | target_pid_to_str (ptid_of (thread)), |
87ce2a04 | 1497 | gdb_signal_to_string (signo)); |
9b224c5e PA |
1498 | |
1499 | return WSTOPSIG (status); | |
1500 | } | |
1501 | } | |
1502 | ||
ced2dffb PA |
1503 | /* Detach from LWP. */ |
1504 | ||
1505 | static void | |
1506 | linux_detach_one_lwp (struct lwp_info *lwp) | |
6ad8ae5c | 1507 | { |
ced2dffb | 1508 | struct thread_info *thread = get_lwp_thread (lwp); |
9b224c5e | 1509 | int sig; |
ced2dffb | 1510 | int lwpid; |
6ad8ae5c | 1511 | |
9b224c5e | 1512 | /* If there is a pending SIGSTOP, get rid of it. */ |
54a0b537 | 1513 | if (lwp->stop_expected) |
ae13219e | 1514 | { |
9b224c5e | 1515 | if (debug_threads) |
87ce2a04 | 1516 | debug_printf ("Sending SIGCONT to %s\n", |
d86d4aaf | 1517 | target_pid_to_str (ptid_of (thread))); |
9b224c5e | 1518 | |
d86d4aaf | 1519 | kill_lwp (lwpid_of (thread), SIGCONT); |
54a0b537 | 1520 | lwp->stop_expected = 0; |
ae13219e DJ |
1521 | } |
1522 | ||
9b224c5e PA |
1523 | /* Pass on any pending signal for this thread. */ |
1524 | sig = get_detach_signal (thread); | |
1525 | ||
ced2dffb PA |
1526 | /* Preparing to resume may try to write registers, and fail if the |
1527 | lwp is zombie. If that happens, ignore the error. We'll handle | |
1528 | it below, when detach fails with ESRCH. */ | |
1529 | TRY | |
1530 | { | |
1531 | /* Flush any pending changes to the process's registers. */ | |
1532 | regcache_invalidate_thread (thread); | |
1533 | ||
1534 | /* Finally, let it resume. */ | |
1535 | if (the_low_target.prepare_to_resume != NULL) | |
1536 | the_low_target.prepare_to_resume (lwp); | |
1537 | } | |
1538 | CATCH (ex, RETURN_MASK_ERROR) | |
1539 | { | |
1540 | if (!check_ptrace_stopped_lwp_gone (lwp)) | |
1541 | throw_exception (ex); | |
1542 | } | |
1543 | END_CATCH | |
1544 | ||
1545 | lwpid = lwpid_of (thread); | |
1546 | if (ptrace (PTRACE_DETACH, lwpid, (PTRACE_TYPE_ARG3) 0, | |
b8e1b30e | 1547 | (PTRACE_TYPE_ARG4) (long) sig) < 0) |
ced2dffb PA |
1548 | { |
1549 | int save_errno = errno; | |
1550 | ||
1551 | /* We know the thread exists, so ESRCH must mean the lwp is | |
1552 | zombie. This can happen if one of the already-detached | |
1553 | threads exits the whole thread group. In that case we're | |
1554 | still attached, and must reap the lwp. */ | |
1555 | if (save_errno == ESRCH) | |
1556 | { | |
1557 | int ret, status; | |
1558 | ||
1559 | ret = my_waitpid (lwpid, &status, __WALL); | |
1560 | if (ret == -1) | |
1561 | { | |
1562 | warning (_("Couldn't reap LWP %d while detaching: %s"), | |
1563 | lwpid, strerror (errno)); | |
1564 | } | |
1565 | else if (!WIFEXITED (status) && !WIFSIGNALED (status)) | |
1566 | { | |
1567 | warning (_("Reaping LWP %d while detaching " | |
1568 | "returned unexpected status 0x%x"), | |
1569 | lwpid, status); | |
1570 | } | |
1571 | } | |
1572 | else | |
1573 | { | |
1574 | error (_("Can't detach %s: %s"), | |
1575 | target_pid_to_str (ptid_of (thread)), | |
1576 | strerror (save_errno)); | |
1577 | } | |
1578 | } | |
1579 | else if (debug_threads) | |
1580 | { | |
1581 | debug_printf ("PTRACE_DETACH (%s, %s, 0) (OK)\n", | |
1582 | target_pid_to_str (ptid_of (thread)), | |
1583 | strsignal (sig)); | |
1584 | } | |
bd99dc85 PA |
1585 | |
1586 | delete_lwp (lwp); | |
ced2dffb PA |
1587 | } |
1588 | ||
798a38e8 | 1589 | /* Callback for for_each_thread. Detaches from non-leader threads of a |
ced2dffb PA |
1590 | given process. */ |
1591 | ||
798a38e8 SM |
1592 | static void |
1593 | linux_detach_lwp_callback (thread_info *thread) | |
ced2dffb | 1594 | { |
ced2dffb PA |
1595 | /* We don't actually detach from the thread group leader just yet. |
1596 | If the thread group exits, we must reap the zombie clone lwps | |
1597 | before we're able to reap the leader. */ | |
798a38e8 SM |
1598 | if (thread->id.pid () == thread->id.lwp ()) |
1599 | return; | |
ced2dffb | 1600 | |
798a38e8 | 1601 | lwp_info *lwp = get_thread_lwp (thread); |
ced2dffb | 1602 | linux_detach_one_lwp (lwp); |
6ad8ae5c DJ |
1603 | } |
1604 | ||
95954743 | 1605 | static int |
ef2ddb33 | 1606 | linux_detach (process_info *process) |
95954743 | 1607 | { |
ced2dffb | 1608 | struct lwp_info *main_lwp; |
95954743 | 1609 | |
863d01bd PA |
1610 | /* As there's a step over already in progress, let it finish first, |
1611 | otherwise nesting a stabilize_threads operation on top gets real | |
1612 | messy. */ | |
1613 | complete_ongoing_step_over (); | |
1614 | ||
f9e39928 PA |
1615 | /* Stop all threads before detaching. First, ptrace requires that |
1616 | the thread is stopped to sucessfully detach. Second, thread_db | |
1617 | may need to uninstall thread event breakpoints from memory, which | |
1618 | only works with a stopped process anyway. */ | |
7984d532 | 1619 | stop_all_lwps (0, NULL); |
f9e39928 | 1620 | |
ca5c370d | 1621 | #ifdef USE_THREAD_DB |
8336d594 | 1622 | thread_db_detach (process); |
ca5c370d PA |
1623 | #endif |
1624 | ||
fa593d66 PA |
1625 | /* Stabilize threads (move out of jump pads). */ |
1626 | stabilize_threads (); | |
1627 | ||
ced2dffb PA |
1628 | /* Detach from the clone lwps first. If the thread group exits just |
1629 | while we're detaching, we must reap the clone lwps before we're | |
1630 | able to reap the leader. */ | |
ef2ddb33 | 1631 | for_each_thread (process->pid, linux_detach_lwp_callback); |
ced2dffb | 1632 | |
ef2ddb33 | 1633 | main_lwp = find_lwp_pid (ptid_t (process->pid)); |
ced2dffb | 1634 | linux_detach_one_lwp (main_lwp); |
8336d594 PA |
1635 | |
1636 | the_target->mourn (process); | |
f9e39928 PA |
1637 | |
1638 | /* Since we presently can only stop all lwps of all processes, we | |
1639 | need to unstop lwps of other processes. */ | |
7984d532 | 1640 | unstop_all_lwps (0, NULL); |
f9e39928 PA |
1641 | return 0; |
1642 | } | |
1643 | ||
1644 | /* Remove all LWPs that belong to process PROC from the lwp list. */ | |
1645 | ||
8336d594 PA |
1646 | static void |
1647 | linux_mourn (struct process_info *process) | |
1648 | { | |
1649 | struct process_info_private *priv; | |
1650 | ||
1651 | #ifdef USE_THREAD_DB | |
1652 | thread_db_mourn (process); | |
1653 | #endif | |
1654 | ||
6b2a85da SM |
1655 | for_each_thread (process->pid, [] (thread_info *thread) |
1656 | { | |
1657 | delete_lwp (get_thread_lwp (thread)); | |
1658 | }); | |
f9e39928 | 1659 | |
8336d594 | 1660 | /* Freeing all private data. */ |
fe978cb0 | 1661 | priv = process->priv; |
04ec7890 SM |
1662 | if (the_low_target.delete_process != NULL) |
1663 | the_low_target.delete_process (priv->arch_private); | |
1664 | else | |
1665 | gdb_assert (priv->arch_private == NULL); | |
8336d594 | 1666 | free (priv); |
fe978cb0 | 1667 | process->priv = NULL; |
505106cd PA |
1668 | |
1669 | remove_process (process); | |
8336d594 PA |
1670 | } |
1671 | ||
444d6139 | 1672 | static void |
ef2ddb33 | 1673 | linux_join (process_info *proc) |
444d6139 | 1674 | { |
444d6139 PA |
1675 | int status, ret; |
1676 | ||
1677 | do { | |
ef2ddb33 | 1678 | ret = my_waitpid (proc->pid, &status, 0); |
444d6139 PA |
1679 | if (WIFEXITED (status) || WIFSIGNALED (status)) |
1680 | break; | |
1681 | } while (ret != -1 || errno != ECHILD); | |
1682 | } | |
1683 | ||
6ad8ae5c | 1684 | /* Return nonzero if the given thread is still alive. */ |
0d62e5e8 | 1685 | static int |
95954743 | 1686 | linux_thread_alive (ptid_t ptid) |
0d62e5e8 | 1687 | { |
95954743 PA |
1688 | struct lwp_info *lwp = find_lwp_pid (ptid); |
1689 | ||
1690 | /* We assume we always know if a thread exits. If a whole process | |
1691 | exited but we still haven't been able to report it to GDB, we'll | |
1692 | hold on to the last lwp of the dead process. */ | |
1693 | if (lwp != NULL) | |
00db26fa | 1694 | return !lwp_is_marked_dead (lwp); |
0d62e5e8 DJ |
1695 | else |
1696 | return 0; | |
1697 | } | |
1698 | ||
582511be PA |
1699 | /* Return 1 if this lwp still has an interesting status pending. If |
1700 | not (e.g., it had stopped for a breakpoint that is gone), return | |
1701 | false. */ | |
1702 | ||
1703 | static int | |
1704 | thread_still_has_status_pending_p (struct thread_info *thread) | |
1705 | { | |
1706 | struct lwp_info *lp = get_thread_lwp (thread); | |
1707 | ||
1708 | if (!lp->status_pending_p) | |
1709 | return 0; | |
1710 | ||
582511be | 1711 | if (thread->last_resume_kind != resume_stop |
15c66dd6 PA |
1712 | && (lp->stop_reason == TARGET_STOPPED_BY_SW_BREAKPOINT |
1713 | || lp->stop_reason == TARGET_STOPPED_BY_HW_BREAKPOINT)) | |
582511be PA |
1714 | { |
1715 | struct thread_info *saved_thread; | |
1716 | CORE_ADDR pc; | |
1717 | int discard = 0; | |
1718 | ||
1719 | gdb_assert (lp->last_status != 0); | |
1720 | ||
1721 | pc = get_pc (lp); | |
1722 | ||
1723 | saved_thread = current_thread; | |
1724 | current_thread = thread; | |
1725 | ||
1726 | if (pc != lp->stop_pc) | |
1727 | { | |
1728 | if (debug_threads) | |
1729 | debug_printf ("PC of %ld changed\n", | |
1730 | lwpid_of (thread)); | |
1731 | discard = 1; | |
1732 | } | |
3e572f71 PA |
1733 | |
1734 | #if !USE_SIGTRAP_SIGINFO | |
15c66dd6 | 1735 | else if (lp->stop_reason == TARGET_STOPPED_BY_SW_BREAKPOINT |
582511be PA |
1736 | && !(*the_low_target.breakpoint_at) (pc)) |
1737 | { | |
1738 | if (debug_threads) | |
1739 | debug_printf ("previous SW breakpoint of %ld gone\n", | |
1740 | lwpid_of (thread)); | |
1741 | discard = 1; | |
1742 | } | |
15c66dd6 | 1743 | else if (lp->stop_reason == TARGET_STOPPED_BY_HW_BREAKPOINT |
582511be PA |
1744 | && !hardware_breakpoint_inserted_here (pc)) |
1745 | { | |
1746 | if (debug_threads) | |
1747 | debug_printf ("previous HW breakpoint of %ld gone\n", | |
1748 | lwpid_of (thread)); | |
1749 | discard = 1; | |
1750 | } | |
3e572f71 | 1751 | #endif |
582511be PA |
1752 | |
1753 | current_thread = saved_thread; | |
1754 | ||
1755 | if (discard) | |
1756 | { | |
1757 | if (debug_threads) | |
1758 | debug_printf ("discarding pending breakpoint status\n"); | |
1759 | lp->status_pending_p = 0; | |
1760 | return 0; | |
1761 | } | |
1762 | } | |
1763 | ||
1764 | return 1; | |
1765 | } | |
1766 | ||
a681f9c9 PA |
1767 | /* Returns true if LWP is resumed from the client's perspective. */ |
1768 | ||
1769 | static int | |
1770 | lwp_resumed (struct lwp_info *lwp) | |
1771 | { | |
1772 | struct thread_info *thread = get_lwp_thread (lwp); | |
1773 | ||
1774 | if (thread->last_resume_kind != resume_stop) | |
1775 | return 1; | |
1776 | ||
1777 | /* Did gdb send us a `vCont;t', but we haven't reported the | |
1778 | corresponding stop to gdb yet? If so, the thread is still | |
1779 | resumed/running from gdb's perspective. */ | |
1780 | if (thread->last_resume_kind == resume_stop | |
1781 | && thread->last_status.kind == TARGET_WAITKIND_IGNORE) | |
1782 | return 1; | |
1783 | ||
1784 | return 0; | |
1785 | } | |
1786 | ||
83e1b6c1 SM |
1787 | /* Return true if this lwp has an interesting status pending. */ |
1788 | static bool | |
1789 | status_pending_p_callback (thread_info *thread, ptid_t ptid) | |
0d62e5e8 | 1790 | { |
582511be | 1791 | struct lwp_info *lp = get_thread_lwp (thread); |
95954743 PA |
1792 | |
1793 | /* Check if we're only interested in events from a specific process | |
afa8d396 | 1794 | or a specific LWP. */ |
83e1b6c1 | 1795 | if (!thread->id.matches (ptid)) |
95954743 | 1796 | return 0; |
0d62e5e8 | 1797 | |
a681f9c9 PA |
1798 | if (!lwp_resumed (lp)) |
1799 | return 0; | |
1800 | ||
582511be PA |
1801 | if (lp->status_pending_p |
1802 | && !thread_still_has_status_pending_p (thread)) | |
1803 | { | |
1804 | linux_resume_one_lwp (lp, lp->stepping, GDB_SIGNAL_0, NULL); | |
1805 | return 0; | |
1806 | } | |
0d62e5e8 | 1807 | |
582511be | 1808 | return lp->status_pending_p; |
0d62e5e8 DJ |
1809 | } |
1810 | ||
95954743 PA |
1811 | struct lwp_info * |
1812 | find_lwp_pid (ptid_t ptid) | |
1813 | { | |
454296a2 SM |
1814 | thread_info *thread = find_thread ([&] (thread_info *thread) |
1815 | { | |
1816 | int lwp = ptid.lwp () != 0 ? ptid.lwp () : ptid.pid (); | |
1817 | return thread->id.lwp () == lwp; | |
1818 | }); | |
d86d4aaf DE |
1819 | |
1820 | if (thread == NULL) | |
1821 | return NULL; | |
1822 | ||
9c80ecd6 | 1823 | return get_thread_lwp (thread); |
95954743 PA |
1824 | } |
1825 | ||
fa96cb38 | 1826 | /* Return the number of known LWPs in the tgid given by PID. */ |
0d62e5e8 | 1827 | |
fa96cb38 PA |
1828 | static int |
1829 | num_lwps (int pid) | |
1830 | { | |
fa96cb38 | 1831 | int count = 0; |
0d62e5e8 | 1832 | |
4d3bb80e SM |
1833 | for_each_thread (pid, [&] (thread_info *thread) |
1834 | { | |
9c80ecd6 | 1835 | count++; |
4d3bb80e | 1836 | }); |
3aee8918 | 1837 | |
fa96cb38 PA |
1838 | return count; |
1839 | } | |
d61ddec4 | 1840 | |
6d4ee8c6 GB |
1841 | /* See nat/linux-nat.h. */ |
1842 | ||
1843 | struct lwp_info * | |
1844 | iterate_over_lwps (ptid_t filter, | |
1845 | iterate_over_lwps_ftype callback, | |
1846 | void *data) | |
1847 | { | |
6d1e5673 SM |
1848 | thread_info *thread = find_thread (filter, [&] (thread_info *thread) |
1849 | { | |
1850 | lwp_info *lwp = get_thread_lwp (thread); | |
1851 | ||
1852 | return callback (lwp, data); | |
1853 | }); | |
6d4ee8c6 | 1854 | |
9c80ecd6 | 1855 | if (thread == NULL) |
6d4ee8c6 GB |
1856 | return NULL; |
1857 | ||
9c80ecd6 | 1858 | return get_thread_lwp (thread); |
6d4ee8c6 GB |
1859 | } |
1860 | ||
fa96cb38 PA |
1861 | /* Detect zombie thread group leaders, and "exit" them. We can't reap |
1862 | their exits until all other threads in the group have exited. */ | |
c3adc08c | 1863 | |
fa96cb38 PA |
1864 | static void |
1865 | check_zombie_leaders (void) | |
1866 | { | |
9179355e SM |
1867 | for_each_process ([] (process_info *proc) { |
1868 | pid_t leader_pid = pid_of (proc); | |
1869 | struct lwp_info *leader_lp; | |
1870 | ||
f2907e49 | 1871 | leader_lp = find_lwp_pid (ptid_t (leader_pid)); |
9179355e SM |
1872 | |
1873 | if (debug_threads) | |
1874 | debug_printf ("leader_pid=%d, leader_lp!=NULL=%d, " | |
1875 | "num_lwps=%d, zombie=%d\n", | |
1876 | leader_pid, leader_lp!= NULL, num_lwps (leader_pid), | |
1877 | linux_proc_pid_is_zombie (leader_pid)); | |
1878 | ||
1879 | if (leader_lp != NULL && !leader_lp->stopped | |
1880 | /* Check if there are other threads in the group, as we may | |
1881 | have raced with the inferior simply exiting. */ | |
1882 | && !last_thread_of_process_p (leader_pid) | |
1883 | && linux_proc_pid_is_zombie (leader_pid)) | |
1884 | { | |
1885 | /* A leader zombie can mean one of two things: | |
1886 | ||
1887 | - It exited, and there's an exit status pending | |
1888 | available, or only the leader exited (not the whole | |
1889 | program). In the latter case, we can't waitpid the | |
1890 | leader's exit status until all other threads are gone. | |
1891 | ||
1892 | - There are 3 or more threads in the group, and a thread | |
1893 | other than the leader exec'd. On an exec, the Linux | |
1894 | kernel destroys all other threads (except the execing | |
1895 | one) in the thread group, and resets the execing thread's | |
1896 | tid to the tgid. No exit notification is sent for the | |
1897 | execing thread -- from the ptracer's perspective, it | |
1898 | appears as though the execing thread just vanishes. | |
1899 | Until we reap all other threads except the leader and the | |
1900 | execing thread, the leader will be zombie, and the | |
1901 | execing thread will be in `D (disc sleep)'. As soon as | |
1902 | all other threads are reaped, the execing thread changes | |
1903 | it's tid to the tgid, and the previous (zombie) leader | |
1904 | vanishes, giving place to the "new" leader. We could try | |
1905 | distinguishing the exit and exec cases, by waiting once | |
1906 | more, and seeing if something comes out, but it doesn't | |
1907 | sound useful. The previous leader _does_ go away, and | |
1908 | we'll re-add the new one once we see the exec event | |
1909 | (which is just the same as what would happen if the | |
1910 | previous leader did exit voluntarily before some other | |
1911 | thread execs). */ | |
1912 | ||
1913 | if (debug_threads) | |
1914 | debug_printf ("CZL: Thread group leader %d zombie " | |
1915 | "(it exited, or another thread execd).\n", | |
1916 | leader_pid); | |
1917 | ||
1918 | delete_lwp (leader_lp); | |
1919 | } | |
1920 | }); | |
fa96cb38 | 1921 | } |
c3adc08c | 1922 | |
a1385b7b SM |
1923 | /* Callback for `find_thread'. Returns the first LWP that is not |
1924 | stopped. */ | |
d50171e4 | 1925 | |
a1385b7b SM |
1926 | static bool |
1927 | not_stopped_callback (thread_info *thread, ptid_t filter) | |
fa96cb38 | 1928 | { |
a1385b7b SM |
1929 | if (!thread->id.matches (filter)) |
1930 | return false; | |
47c0c975 | 1931 | |
a1385b7b | 1932 | lwp_info *lwp = get_thread_lwp (thread); |
fa96cb38 | 1933 | |
a1385b7b | 1934 | return !lwp->stopped; |
0d62e5e8 | 1935 | } |
611cb4a5 | 1936 | |
863d01bd PA |
1937 | /* Increment LWP's suspend count. */ |
1938 | ||
1939 | static void | |
1940 | lwp_suspended_inc (struct lwp_info *lwp) | |
1941 | { | |
1942 | lwp->suspended++; | |
1943 | ||
1944 | if (debug_threads && lwp->suspended > 4) | |
1945 | { | |
1946 | struct thread_info *thread = get_lwp_thread (lwp); | |
1947 | ||
1948 | debug_printf ("LWP %ld has a suspiciously high suspend count," | |
1949 | " suspended=%d\n", lwpid_of (thread), lwp->suspended); | |
1950 | } | |
1951 | } | |
1952 | ||
1953 | /* Decrement LWP's suspend count. */ | |
1954 | ||
1955 | static void | |
1956 | lwp_suspended_decr (struct lwp_info *lwp) | |
1957 | { | |
1958 | lwp->suspended--; | |
1959 | ||
1960 | if (lwp->suspended < 0) | |
1961 | { | |
1962 | struct thread_info *thread = get_lwp_thread (lwp); | |
1963 | ||
1964 | internal_error (__FILE__, __LINE__, | |
1965 | "unsuspend LWP %ld, suspended=%d\n", lwpid_of (thread), | |
1966 | lwp->suspended); | |
1967 | } | |
1968 | } | |
1969 | ||
219f2f23 PA |
1970 | /* This function should only be called if the LWP got a SIGTRAP. |
1971 | ||
1972 | Handle any tracepoint steps or hits. Return true if a tracepoint | |
1973 | event was handled, 0 otherwise. */ | |
1974 | ||
1975 | static int | |
1976 | handle_tracepoints (struct lwp_info *lwp) | |
1977 | { | |
1978 | struct thread_info *tinfo = get_lwp_thread (lwp); | |
1979 | int tpoint_related_event = 0; | |
1980 | ||
582511be PA |
1981 | gdb_assert (lwp->suspended == 0); |
1982 | ||
7984d532 PA |
1983 | /* If this tracepoint hit causes a tracing stop, we'll immediately |
1984 | uninsert tracepoints. To do this, we temporarily pause all | |
1985 | threads, unpatch away, and then unpause threads. We need to make | |
1986 | sure the unpausing doesn't resume LWP too. */ | |
863d01bd | 1987 | lwp_suspended_inc (lwp); |
7984d532 | 1988 | |
219f2f23 PA |
1989 | /* And we need to be sure that any all-threads-stopping doesn't try |
1990 | to move threads out of the jump pads, as it could deadlock the | |
1991 | inferior (LWP could be in the jump pad, maybe even holding the | |
1992 | lock.) */ | |
1993 | ||
1994 | /* Do any necessary step collect actions. */ | |
1995 | tpoint_related_event |= tracepoint_finished_step (tinfo, lwp->stop_pc); | |
1996 | ||
fa593d66 PA |
1997 | tpoint_related_event |= handle_tracepoint_bkpts (tinfo, lwp->stop_pc); |
1998 | ||
219f2f23 PA |
1999 | /* See if we just hit a tracepoint and do its main collect |
2000 | actions. */ | |
2001 | tpoint_related_event |= tracepoint_was_hit (tinfo, lwp->stop_pc); | |
2002 | ||
863d01bd | 2003 | lwp_suspended_decr (lwp); |
7984d532 PA |
2004 | |
2005 | gdb_assert (lwp->suspended == 0); | |
229d26fc SM |
2006 | gdb_assert (!stabilizing_threads |
2007 | || (lwp->collecting_fast_tracepoint | |
2008 | != fast_tpoint_collect_result::not_collecting)); | |
7984d532 | 2009 | |
219f2f23 PA |
2010 | if (tpoint_related_event) |
2011 | { | |
2012 | if (debug_threads) | |
87ce2a04 | 2013 | debug_printf ("got a tracepoint event\n"); |
219f2f23 PA |
2014 | return 1; |
2015 | } | |
2016 | ||
2017 | return 0; | |
2018 | } | |
2019 | ||
229d26fc SM |
2020 | /* Convenience wrapper. Returns information about LWP's fast tracepoint |
2021 | collection status. */ | |
fa593d66 | 2022 | |
229d26fc | 2023 | static fast_tpoint_collect_result |
fa593d66 PA |
2024 | linux_fast_tracepoint_collecting (struct lwp_info *lwp, |
2025 | struct fast_tpoint_collect_status *status) | |
2026 | { | |
2027 | CORE_ADDR thread_area; | |
d86d4aaf | 2028 | struct thread_info *thread = get_lwp_thread (lwp); |
fa593d66 PA |
2029 | |
2030 | if (the_low_target.get_thread_area == NULL) | |
229d26fc | 2031 | return fast_tpoint_collect_result::not_collecting; |
fa593d66 PA |
2032 | |
2033 | /* Get the thread area address. This is used to recognize which | |
2034 | thread is which when tracing with the in-process agent library. | |
2035 | We don't read anything from the address, and treat it as opaque; | |
2036 | it's the address itself that we assume is unique per-thread. */ | |
d86d4aaf | 2037 | if ((*the_low_target.get_thread_area) (lwpid_of (thread), &thread_area) == -1) |
229d26fc | 2038 | return fast_tpoint_collect_result::not_collecting; |
fa593d66 PA |
2039 | |
2040 | return fast_tracepoint_collecting (thread_area, lwp->stop_pc, status); | |
2041 | } | |
2042 | ||
2043 | /* The reason we resume in the caller, is because we want to be able | |
2044 | to pass lwp->status_pending as WSTAT, and we need to clear | |
2045 | status_pending_p before resuming, otherwise, linux_resume_one_lwp | |
2046 | refuses to resume. */ | |
2047 | ||
2048 | static int | |
2049 | maybe_move_out_of_jump_pad (struct lwp_info *lwp, int *wstat) | |
2050 | { | |
0bfdf32f | 2051 | struct thread_info *saved_thread; |
fa593d66 | 2052 | |
0bfdf32f GB |
2053 | saved_thread = current_thread; |
2054 | current_thread = get_lwp_thread (lwp); | |
fa593d66 PA |
2055 | |
2056 | if ((wstat == NULL | |
2057 | || (WIFSTOPPED (*wstat) && WSTOPSIG (*wstat) != SIGTRAP)) | |
2058 | && supports_fast_tracepoints () | |
58b4daa5 | 2059 | && agent_loaded_p ()) |
fa593d66 PA |
2060 | { |
2061 | struct fast_tpoint_collect_status status; | |
fa593d66 PA |
2062 | |
2063 | if (debug_threads) | |
87ce2a04 DE |
2064 | debug_printf ("Checking whether LWP %ld needs to move out of the " |
2065 | "jump pad.\n", | |
0bfdf32f | 2066 | lwpid_of (current_thread)); |
fa593d66 | 2067 | |
229d26fc SM |
2068 | fast_tpoint_collect_result r |
2069 | = linux_fast_tracepoint_collecting (lwp, &status); | |
fa593d66 PA |
2070 | |
2071 | if (wstat == NULL | |
2072 | || (WSTOPSIG (*wstat) != SIGILL | |
2073 | && WSTOPSIG (*wstat) != SIGFPE | |
2074 | && WSTOPSIG (*wstat) != SIGSEGV | |
2075 | && WSTOPSIG (*wstat) != SIGBUS)) | |
2076 | { | |
2077 | lwp->collecting_fast_tracepoint = r; | |
2078 | ||
229d26fc | 2079 | if (r != fast_tpoint_collect_result::not_collecting) |
fa593d66 | 2080 | { |
229d26fc SM |
2081 | if (r == fast_tpoint_collect_result::before_insn |
2082 | && lwp->exit_jump_pad_bkpt == NULL) | |
fa593d66 PA |
2083 | { |
2084 | /* Haven't executed the original instruction yet. | |
2085 | Set breakpoint there, and wait till it's hit, | |
2086 | then single-step until exiting the jump pad. */ | |
2087 | lwp->exit_jump_pad_bkpt | |
2088 | = set_breakpoint_at (status.adjusted_insn_addr, NULL); | |
2089 | } | |
2090 | ||
2091 | if (debug_threads) | |
87ce2a04 DE |
2092 | debug_printf ("Checking whether LWP %ld needs to move out of " |
2093 | "the jump pad...it does\n", | |
0bfdf32f GB |
2094 | lwpid_of (current_thread)); |
2095 | current_thread = saved_thread; | |
fa593d66 PA |
2096 | |
2097 | return 1; | |
2098 | } | |
2099 | } | |
2100 | else | |
2101 | { | |
2102 | /* If we get a synchronous signal while collecting, *and* | |
2103 | while executing the (relocated) original instruction, | |
2104 | reset the PC to point at the tpoint address, before | |
2105 | reporting to GDB. Otherwise, it's an IPA lib bug: just | |
2106 | report the signal to GDB, and pray for the best. */ | |
2107 | ||
229d26fc SM |
2108 | lwp->collecting_fast_tracepoint |
2109 | = fast_tpoint_collect_result::not_collecting; | |
fa593d66 | 2110 | |
229d26fc | 2111 | if (r != fast_tpoint_collect_result::not_collecting |
fa593d66 PA |
2112 | && (status.adjusted_insn_addr <= lwp->stop_pc |
2113 | && lwp->stop_pc < status.adjusted_insn_addr_end)) | |
2114 | { | |
2115 | siginfo_t info; | |
2116 | struct regcache *regcache; | |
2117 | ||
2118 | /* The si_addr on a few signals references the address | |
2119 | of the faulting instruction. Adjust that as | |
2120 | well. */ | |
2121 | if ((WSTOPSIG (*wstat) == SIGILL | |
2122 | || WSTOPSIG (*wstat) == SIGFPE | |
2123 | || WSTOPSIG (*wstat) == SIGBUS | |
2124 | || WSTOPSIG (*wstat) == SIGSEGV) | |
0bfdf32f | 2125 | && ptrace (PTRACE_GETSIGINFO, lwpid_of (current_thread), |
b8e1b30e | 2126 | (PTRACE_TYPE_ARG3) 0, &info) == 0 |
fa593d66 PA |
2127 | /* Final check just to make sure we don't clobber |
2128 | the siginfo of non-kernel-sent signals. */ | |
2129 | && (uintptr_t) info.si_addr == lwp->stop_pc) | |
2130 | { | |
2131 | info.si_addr = (void *) (uintptr_t) status.tpoint_addr; | |
0bfdf32f | 2132 | ptrace (PTRACE_SETSIGINFO, lwpid_of (current_thread), |
b8e1b30e | 2133 | (PTRACE_TYPE_ARG3) 0, &info); |
fa593d66 PA |
2134 | } |
2135 | ||
0bfdf32f | 2136 | regcache = get_thread_regcache (current_thread, 1); |
fa593d66 PA |
2137 | (*the_low_target.set_pc) (regcache, status.tpoint_addr); |
2138 | lwp->stop_pc = status.tpoint_addr; | |
2139 | ||
2140 | /* Cancel any fast tracepoint lock this thread was | |
2141 | holding. */ | |
2142 | force_unlock_trace_buffer (); | |
2143 | } | |
2144 | ||
2145 | if (lwp->exit_jump_pad_bkpt != NULL) | |
2146 | { | |
2147 | if (debug_threads) | |
87ce2a04 DE |
2148 | debug_printf ("Cancelling fast exit-jump-pad: removing bkpt. " |
2149 | "stopping all threads momentarily.\n"); | |
fa593d66 PA |
2150 | |
2151 | stop_all_lwps (1, lwp); | |
fa593d66 PA |
2152 | |
2153 | delete_breakpoint (lwp->exit_jump_pad_bkpt); | |
2154 | lwp->exit_jump_pad_bkpt = NULL; | |
2155 | ||
2156 | unstop_all_lwps (1, lwp); | |
2157 | ||
2158 | gdb_assert (lwp->suspended >= 0); | |
2159 | } | |
2160 | } | |
2161 | } | |
2162 | ||
2163 | if (debug_threads) | |
87ce2a04 DE |
2164 | debug_printf ("Checking whether LWP %ld needs to move out of the " |
2165 | "jump pad...no\n", | |
0bfdf32f | 2166 | lwpid_of (current_thread)); |
0cccb683 | 2167 | |
0bfdf32f | 2168 | current_thread = saved_thread; |
fa593d66 PA |
2169 | return 0; |
2170 | } | |
2171 | ||
2172 | /* Enqueue one signal in the "signals to report later when out of the | |
2173 | jump pad" list. */ | |
2174 | ||
2175 | static void | |
2176 | enqueue_one_deferred_signal (struct lwp_info *lwp, int *wstat) | |
2177 | { | |
2178 | struct pending_signals *p_sig; | |
d86d4aaf | 2179 | struct thread_info *thread = get_lwp_thread (lwp); |
fa593d66 PA |
2180 | |
2181 | if (debug_threads) | |
87ce2a04 | 2182 | debug_printf ("Deferring signal %d for LWP %ld.\n", |
d86d4aaf | 2183 | WSTOPSIG (*wstat), lwpid_of (thread)); |
fa593d66 PA |
2184 | |
2185 | if (debug_threads) | |
2186 | { | |
2187 | struct pending_signals *sig; | |
2188 | ||
2189 | for (sig = lwp->pending_signals_to_report; | |
2190 | sig != NULL; | |
2191 | sig = sig->prev) | |
87ce2a04 DE |
2192 | debug_printf (" Already queued %d\n", |
2193 | sig->signal); | |
fa593d66 | 2194 | |
87ce2a04 | 2195 | debug_printf (" (no more currently queued signals)\n"); |
fa593d66 PA |
2196 | } |
2197 | ||
1a981360 PA |
2198 | /* Don't enqueue non-RT signals if they are already in the deferred |
2199 | queue. (SIGSTOP being the easiest signal to see ending up here | |
2200 | twice) */ | |
2201 | if (WSTOPSIG (*wstat) < __SIGRTMIN) | |
2202 | { | |
2203 | struct pending_signals *sig; | |
2204 | ||
2205 | for (sig = lwp->pending_signals_to_report; | |
2206 | sig != NULL; | |
2207 | sig = sig->prev) | |
2208 | { | |
2209 | if (sig->signal == WSTOPSIG (*wstat)) | |
2210 | { | |
2211 | if (debug_threads) | |
87ce2a04 DE |
2212 | debug_printf ("Not requeuing already queued non-RT signal %d" |
2213 | " for LWP %ld\n", | |
2214 | sig->signal, | |
d86d4aaf | 2215 | lwpid_of (thread)); |
1a981360 PA |
2216 | return; |
2217 | } | |
2218 | } | |
2219 | } | |
2220 | ||
8d749320 | 2221 | p_sig = XCNEW (struct pending_signals); |
fa593d66 PA |
2222 | p_sig->prev = lwp->pending_signals_to_report; |
2223 | p_sig->signal = WSTOPSIG (*wstat); | |
8d749320 | 2224 | |
d86d4aaf | 2225 | ptrace (PTRACE_GETSIGINFO, lwpid_of (thread), (PTRACE_TYPE_ARG3) 0, |
56f7af9c | 2226 | &p_sig->info); |
fa593d66 PA |
2227 | |
2228 | lwp->pending_signals_to_report = p_sig; | |
2229 | } | |
2230 | ||
2231 | /* Dequeue one signal from the "signals to report later when out of | |
2232 | the jump pad" list. */ | |
2233 | ||
2234 | static int | |
2235 | dequeue_one_deferred_signal (struct lwp_info *lwp, int *wstat) | |
2236 | { | |
d86d4aaf DE |
2237 | struct thread_info *thread = get_lwp_thread (lwp); |
2238 | ||
fa593d66 PA |
2239 | if (lwp->pending_signals_to_report != NULL) |
2240 | { | |
2241 | struct pending_signals **p_sig; | |
2242 | ||
2243 | p_sig = &lwp->pending_signals_to_report; | |
2244 | while ((*p_sig)->prev != NULL) | |
2245 | p_sig = &(*p_sig)->prev; | |
2246 | ||
2247 | *wstat = W_STOPCODE ((*p_sig)->signal); | |
2248 | if ((*p_sig)->info.si_signo != 0) | |
d86d4aaf | 2249 | ptrace (PTRACE_SETSIGINFO, lwpid_of (thread), (PTRACE_TYPE_ARG3) 0, |
56f7af9c | 2250 | &(*p_sig)->info); |
fa593d66 PA |
2251 | free (*p_sig); |
2252 | *p_sig = NULL; | |
2253 | ||
2254 | if (debug_threads) | |
87ce2a04 | 2255 | debug_printf ("Reporting deferred signal %d for LWP %ld.\n", |
d86d4aaf | 2256 | WSTOPSIG (*wstat), lwpid_of (thread)); |
fa593d66 PA |
2257 | |
2258 | if (debug_threads) | |
2259 | { | |
2260 | struct pending_signals *sig; | |
2261 | ||
2262 | for (sig = lwp->pending_signals_to_report; | |
2263 | sig != NULL; | |
2264 | sig = sig->prev) | |
87ce2a04 DE |
2265 | debug_printf (" Still queued %d\n", |
2266 | sig->signal); | |
fa593d66 | 2267 | |
87ce2a04 | 2268 | debug_printf (" (no more queued signals)\n"); |
fa593d66 PA |
2269 | } |
2270 | ||
2271 | return 1; | |
2272 | } | |
2273 | ||
2274 | return 0; | |
2275 | } | |
2276 | ||
582511be PA |
2277 | /* Fetch the possibly triggered data watchpoint info and store it in |
2278 | CHILD. | |
d50171e4 | 2279 | |
582511be PA |
2280 | On some archs, like x86, that use debug registers to set |
2281 | watchpoints, it's possible that the way to know which watched | |
2282 | address trapped, is to check the register that is used to select | |
2283 | which address to watch. Problem is, between setting the watchpoint | |
2284 | and reading back which data address trapped, the user may change | |
2285 | the set of watchpoints, and, as a consequence, GDB changes the | |
2286 | debug registers in the inferior. To avoid reading back a stale | |
2287 | stopped-data-address when that happens, we cache in LP the fact | |
2288 | that a watchpoint trapped, and the corresponding data address, as | |
2289 | soon as we see CHILD stop with a SIGTRAP. If GDB changes the debug | |
2290 | registers meanwhile, we have the cached data we can rely on. */ | |
d50171e4 | 2291 | |
582511be PA |
2292 | static int |
2293 | check_stopped_by_watchpoint (struct lwp_info *child) | |
2294 | { | |
2295 | if (the_low_target.stopped_by_watchpoint != NULL) | |
d50171e4 | 2296 | { |
582511be | 2297 | struct thread_info *saved_thread; |
d50171e4 | 2298 | |
582511be PA |
2299 | saved_thread = current_thread; |
2300 | current_thread = get_lwp_thread (child); | |
2301 | ||
2302 | if (the_low_target.stopped_by_watchpoint ()) | |
d50171e4 | 2303 | { |
15c66dd6 | 2304 | child->stop_reason = TARGET_STOPPED_BY_WATCHPOINT; |
582511be PA |
2305 | |
2306 | if (the_low_target.stopped_data_address != NULL) | |
2307 | child->stopped_data_address | |
2308 | = the_low_target.stopped_data_address (); | |
2309 | else | |
2310 | child->stopped_data_address = 0; | |
d50171e4 PA |
2311 | } |
2312 | ||
0bfdf32f | 2313 | current_thread = saved_thread; |
d50171e4 PA |
2314 | } |
2315 | ||
15c66dd6 | 2316 | return child->stop_reason == TARGET_STOPPED_BY_WATCHPOINT; |
c4d9ceb6 YQ |
2317 | } |
2318 | ||
de0d863e DB |
2319 | /* Return the ptrace options that we want to try to enable. */ |
2320 | ||
2321 | static int | |
2322 | linux_low_ptrace_options (int attached) | |
2323 | { | |
c12a5089 | 2324 | client_state &cs = get_client_state (); |
de0d863e DB |
2325 | int options = 0; |
2326 | ||
2327 | if (!attached) | |
2328 | options |= PTRACE_O_EXITKILL; | |
2329 | ||
c12a5089 | 2330 | if (cs.report_fork_events) |
de0d863e DB |
2331 | options |= PTRACE_O_TRACEFORK; |
2332 | ||
c12a5089 | 2333 | if (cs.report_vfork_events) |
c269dbdb DB |
2334 | options |= (PTRACE_O_TRACEVFORK | PTRACE_O_TRACEVFORKDONE); |
2335 | ||
c12a5089 | 2336 | if (cs.report_exec_events) |
94585166 DB |
2337 | options |= PTRACE_O_TRACEEXEC; |
2338 | ||
82075af2 JS |
2339 | options |= PTRACE_O_TRACESYSGOOD; |
2340 | ||
de0d863e DB |
2341 | return options; |
2342 | } | |
2343 | ||
fa96cb38 PA |
2344 | /* Do low-level handling of the event, and check if we should go on |
2345 | and pass it to caller code. Return the affected lwp if we are, or | |
2346 | NULL otherwise. */ | |
2347 | ||
2348 | static struct lwp_info * | |
582511be | 2349 | linux_low_filter_event (int lwpid, int wstat) |
fa96cb38 | 2350 | { |
c12a5089 | 2351 | client_state &cs = get_client_state (); |
fa96cb38 PA |
2352 | struct lwp_info *child; |
2353 | struct thread_info *thread; | |
582511be | 2354 | int have_stop_pc = 0; |
fa96cb38 | 2355 | |
f2907e49 | 2356 | child = find_lwp_pid (ptid_t (lwpid)); |
fa96cb38 | 2357 | |
94585166 DB |
2358 | /* Check for stop events reported by a process we didn't already |
2359 | know about - anything not already in our LWP list. | |
2360 | ||
2361 | If we're expecting to receive stopped processes after | |
2362 | fork, vfork, and clone events, then we'll just add the | |
2363 | new one to our list and go back to waiting for the event | |
2364 | to be reported - the stopped process might be returned | |
2365 | from waitpid before or after the event is. | |
2366 | ||
2367 | But note the case of a non-leader thread exec'ing after the | |
2368 | leader having exited, and gone from our lists (because | |
2369 | check_zombie_leaders deleted it). The non-leader thread | |
2370 | changes its tid to the tgid. */ | |
2371 | ||
2372 | if (WIFSTOPPED (wstat) && child == NULL && WSTOPSIG (wstat) == SIGTRAP | |
2373 | && linux_ptrace_get_extended_event (wstat) == PTRACE_EVENT_EXEC) | |
2374 | { | |
2375 | ptid_t child_ptid; | |
2376 | ||
2377 | /* A multi-thread exec after we had seen the leader exiting. */ | |
2378 | if (debug_threads) | |
2379 | { | |
2380 | debug_printf ("LLW: Re-adding thread group leader LWP %d" | |
2381 | "after exec.\n", lwpid); | |
2382 | } | |
2383 | ||
fd79271b | 2384 | child_ptid = ptid_t (lwpid, lwpid, 0); |
94585166 DB |
2385 | child = add_lwp (child_ptid); |
2386 | child->stopped = 1; | |
2387 | current_thread = child->thread; | |
2388 | } | |
2389 | ||
fa96cb38 PA |
2390 | /* If we didn't find a process, one of two things presumably happened: |
2391 | - A process we started and then detached from has exited. Ignore it. | |
2392 | - A process we are controlling has forked and the new child's stop | |
2393 | was reported to us by the kernel. Save its PID. */ | |
2394 | if (child == NULL && WIFSTOPPED (wstat)) | |
2395 | { | |
2396 | add_to_pid_list (&stopped_pids, lwpid, wstat); | |
2397 | return NULL; | |
2398 | } | |
2399 | else if (child == NULL) | |
2400 | return NULL; | |
2401 | ||
2402 | thread = get_lwp_thread (child); | |
2403 | ||
2404 | child->stopped = 1; | |
2405 | ||
2406 | child->last_status = wstat; | |
2407 | ||
582511be PA |
2408 | /* Check if the thread has exited. */ |
2409 | if ((WIFEXITED (wstat) || WIFSIGNALED (wstat))) | |
2410 | { | |
2411 | if (debug_threads) | |
2412 | debug_printf ("LLFE: %d exited.\n", lwpid); | |
f50bf8e5 YQ |
2413 | |
2414 | if (finish_step_over (child)) | |
2415 | { | |
2416 | /* Unsuspend all other LWPs, and set them back running again. */ | |
2417 | unsuspend_all_lwps (child); | |
2418 | } | |
2419 | ||
65706a29 PA |
2420 | /* If there is at least one more LWP, then the exit signal was |
2421 | not the end of the debugged application and should be | |
2422 | ignored, unless GDB wants to hear about thread exits. */ | |
c12a5089 | 2423 | if (cs.report_thread_events |
65706a29 | 2424 | || last_thread_of_process_p (pid_of (thread))) |
582511be | 2425 | { |
65706a29 PA |
2426 | /* Since events are serialized to GDB core, and we can't |
2427 | report this one right now. Leave the status pending for | |
2428 | the next time we're able to report it. */ | |
2429 | mark_lwp_dead (child, wstat); | |
2430 | return child; | |
582511be PA |
2431 | } |
2432 | else | |
2433 | { | |
65706a29 PA |
2434 | delete_lwp (child); |
2435 | return NULL; | |
582511be PA |
2436 | } |
2437 | } | |
2438 | ||
2439 | gdb_assert (WIFSTOPPED (wstat)); | |
2440 | ||
fa96cb38 PA |
2441 | if (WIFSTOPPED (wstat)) |
2442 | { | |
2443 | struct process_info *proc; | |
2444 | ||
c06cbd92 | 2445 | /* Architecture-specific setup after inferior is running. */ |
fa96cb38 | 2446 | proc = find_process_pid (pid_of (thread)); |
c06cbd92 | 2447 | if (proc->tdesc == NULL) |
fa96cb38 | 2448 | { |
c06cbd92 YQ |
2449 | if (proc->attached) |
2450 | { | |
c06cbd92 YQ |
2451 | /* This needs to happen after we have attached to the |
2452 | inferior and it is stopped for the first time, but | |
2453 | before we access any inferior registers. */ | |
94585166 | 2454 | linux_arch_setup_thread (thread); |
c06cbd92 YQ |
2455 | } |
2456 | else | |
2457 | { | |
2458 | /* The process is started, but GDBserver will do | |
2459 | architecture-specific setup after the program stops at | |
2460 | the first instruction. */ | |
2461 | child->status_pending_p = 1; | |
2462 | child->status_pending = wstat; | |
2463 | return child; | |
2464 | } | |
fa96cb38 PA |
2465 | } |
2466 | } | |
2467 | ||
fa96cb38 PA |
2468 | if (WIFSTOPPED (wstat) && child->must_set_ptrace_flags) |
2469 | { | |
beed38b8 | 2470 | struct process_info *proc = find_process_pid (pid_of (thread)); |
de0d863e | 2471 | int options = linux_low_ptrace_options (proc->attached); |
beed38b8 | 2472 | |
de0d863e | 2473 | linux_enable_event_reporting (lwpid, options); |
fa96cb38 PA |
2474 | child->must_set_ptrace_flags = 0; |
2475 | } | |
2476 | ||
82075af2 JS |
2477 | /* Always update syscall_state, even if it will be filtered later. */ |
2478 | if (WIFSTOPPED (wstat) && WSTOPSIG (wstat) == SYSCALL_SIGTRAP) | |
2479 | { | |
2480 | child->syscall_state | |
2481 | = (child->syscall_state == TARGET_WAITKIND_SYSCALL_ENTRY | |
2482 | ? TARGET_WAITKIND_SYSCALL_RETURN | |
2483 | : TARGET_WAITKIND_SYSCALL_ENTRY); | |
2484 | } | |
2485 | else | |
2486 | { | |
2487 | /* Almost all other ptrace-stops are known to be outside of system | |
2488 | calls, with further exceptions in handle_extended_wait. */ | |
2489 | child->syscall_state = TARGET_WAITKIND_IGNORE; | |
2490 | } | |
2491 | ||
e7ad2f14 PA |
2492 | /* Be careful to not overwrite stop_pc until save_stop_reason is |
2493 | called. */ | |
fa96cb38 | 2494 | if (WIFSTOPPED (wstat) && WSTOPSIG (wstat) == SIGTRAP |
89a5711c | 2495 | && linux_is_extended_waitstatus (wstat)) |
fa96cb38 | 2496 | { |
582511be | 2497 | child->stop_pc = get_pc (child); |
94585166 | 2498 | if (handle_extended_wait (&child, wstat)) |
de0d863e DB |
2499 | { |
2500 | /* The event has been handled, so just return without | |
2501 | reporting it. */ | |
2502 | return NULL; | |
2503 | } | |
fa96cb38 PA |
2504 | } |
2505 | ||
80aea927 | 2506 | if (linux_wstatus_maybe_breakpoint (wstat)) |
582511be | 2507 | { |
e7ad2f14 | 2508 | if (save_stop_reason (child)) |
582511be PA |
2509 | have_stop_pc = 1; |
2510 | } | |
2511 | ||
2512 | if (!have_stop_pc) | |
2513 | child->stop_pc = get_pc (child); | |
2514 | ||
fa96cb38 PA |
2515 | if (WIFSTOPPED (wstat) && WSTOPSIG (wstat) == SIGSTOP |
2516 | && child->stop_expected) | |
2517 | { | |
2518 | if (debug_threads) | |
2519 | debug_printf ("Expected stop.\n"); | |
2520 | child->stop_expected = 0; | |
2521 | ||
2522 | if (thread->last_resume_kind == resume_stop) | |
2523 | { | |
2524 | /* We want to report the stop to the core. Treat the | |
2525 | SIGSTOP as a normal event. */ | |
2bf6fb9d PA |
2526 | if (debug_threads) |
2527 | debug_printf ("LLW: resume_stop SIGSTOP caught for %s.\n", | |
2528 | target_pid_to_str (ptid_of (thread))); | |
fa96cb38 PA |
2529 | } |
2530 | else if (stopping_threads != NOT_STOPPING_THREADS) | |
2531 | { | |
2532 | /* Stopping threads. We don't want this SIGSTOP to end up | |
582511be | 2533 | pending. */ |
2bf6fb9d PA |
2534 | if (debug_threads) |
2535 | debug_printf ("LLW: SIGSTOP caught for %s " | |
2536 | "while stopping threads.\n", | |
2537 | target_pid_to_str (ptid_of (thread))); | |
fa96cb38 PA |
2538 | return NULL; |
2539 | } | |
2540 | else | |
2541 | { | |
2bf6fb9d PA |
2542 | /* This is a delayed SIGSTOP. Filter out the event. */ |
2543 | if (debug_threads) | |
2544 | debug_printf ("LLW: %s %s, 0, 0 (discard delayed SIGSTOP)\n", | |
2545 | child->stepping ? "step" : "continue", | |
2546 | target_pid_to_str (ptid_of (thread))); | |
2547 | ||
fa96cb38 PA |
2548 | linux_resume_one_lwp (child, child->stepping, 0, NULL); |
2549 | return NULL; | |
2550 | } | |
2551 | } | |
2552 | ||
582511be PA |
2553 | child->status_pending_p = 1; |
2554 | child->status_pending = wstat; | |
fa96cb38 PA |
2555 | return child; |
2556 | } | |
2557 | ||
f79b145d YQ |
2558 | /* Return true if THREAD is doing hardware single step. */ |
2559 | ||
2560 | static int | |
2561 | maybe_hw_step (struct thread_info *thread) | |
2562 | { | |
2563 | if (can_hardware_single_step ()) | |
2564 | return 1; | |
2565 | else | |
2566 | { | |
3b9a79ef | 2567 | /* GDBserver must insert single-step breakpoint for software |
f79b145d | 2568 | single step. */ |
3b9a79ef | 2569 | gdb_assert (has_single_step_breakpoints (thread)); |
f79b145d YQ |
2570 | return 0; |
2571 | } | |
2572 | } | |
2573 | ||
20ba1ce6 PA |
2574 | /* Resume LWPs that are currently stopped without any pending status |
2575 | to report, but are resumed from the core's perspective. */ | |
2576 | ||
2577 | static void | |
9c80ecd6 | 2578 | resume_stopped_resumed_lwps (thread_info *thread) |
20ba1ce6 | 2579 | { |
20ba1ce6 PA |
2580 | struct lwp_info *lp = get_thread_lwp (thread); |
2581 | ||
2582 | if (lp->stopped | |
863d01bd | 2583 | && !lp->suspended |
20ba1ce6 | 2584 | && !lp->status_pending_p |
20ba1ce6 PA |
2585 | && thread->last_status.kind == TARGET_WAITKIND_IGNORE) |
2586 | { | |
8901d193 YQ |
2587 | int step = 0; |
2588 | ||
2589 | if (thread->last_resume_kind == resume_step) | |
2590 | step = maybe_hw_step (thread); | |
20ba1ce6 PA |
2591 | |
2592 | if (debug_threads) | |
2593 | debug_printf ("RSRL: resuming stopped-resumed LWP %s at %s: step=%d\n", | |
2594 | target_pid_to_str (ptid_of (thread)), | |
2595 | paddress (lp->stop_pc), | |
2596 | step); | |
2597 | ||
2598 | linux_resume_one_lwp (lp, step, GDB_SIGNAL_0, NULL); | |
2599 | } | |
2600 | } | |
2601 | ||
fa96cb38 PA |
2602 | /* Wait for an event from child(ren) WAIT_PTID, and return any that |
2603 | match FILTER_PTID (leaving others pending). The PTIDs can be: | |
2604 | minus_one_ptid, to specify any child; a pid PTID, specifying all | |
2605 | lwps of a thread group; or a PTID representing a single lwp. Store | |
2606 | the stop status through the status pointer WSTAT. OPTIONS is | |
2607 | passed to the waitpid call. Return 0 if no event was found and | |
2608 | OPTIONS contains WNOHANG. Return -1 if no unwaited-for children | |
2609 | was found. Return the PID of the stopped child otherwise. */ | |
bd99dc85 | 2610 | |
0d62e5e8 | 2611 | static int |
fa96cb38 PA |
2612 | linux_wait_for_event_filtered (ptid_t wait_ptid, ptid_t filter_ptid, |
2613 | int *wstatp, int options) | |
0d62e5e8 | 2614 | { |
d86d4aaf | 2615 | struct thread_info *event_thread; |
d50171e4 | 2616 | struct lwp_info *event_child, *requested_child; |
fa96cb38 | 2617 | sigset_t block_mask, prev_mask; |
d50171e4 | 2618 | |
fa96cb38 | 2619 | retry: |
d86d4aaf DE |
2620 | /* N.B. event_thread points to the thread_info struct that contains |
2621 | event_child. Keep them in sync. */ | |
2622 | event_thread = NULL; | |
d50171e4 PA |
2623 | event_child = NULL; |
2624 | requested_child = NULL; | |
0d62e5e8 | 2625 | |
95954743 | 2626 | /* Check for a lwp with a pending status. */ |
bd99dc85 | 2627 | |
d7e15655 | 2628 | if (filter_ptid == minus_one_ptid || filter_ptid.is_pid ()) |
0d62e5e8 | 2629 | { |
83e1b6c1 SM |
2630 | event_thread = find_thread_in_random ([&] (thread_info *thread) |
2631 | { | |
2632 | return status_pending_p_callback (thread, filter_ptid); | |
2633 | }); | |
2634 | ||
d86d4aaf DE |
2635 | if (event_thread != NULL) |
2636 | event_child = get_thread_lwp (event_thread); | |
2637 | if (debug_threads && event_thread) | |
2638 | debug_printf ("Got a pending child %ld\n", lwpid_of (event_thread)); | |
0d62e5e8 | 2639 | } |
d7e15655 | 2640 | else if (filter_ptid != null_ptid) |
0d62e5e8 | 2641 | { |
fa96cb38 | 2642 | requested_child = find_lwp_pid (filter_ptid); |
d50171e4 | 2643 | |
bde24c0a | 2644 | if (stopping_threads == NOT_STOPPING_THREADS |
fa593d66 | 2645 | && requested_child->status_pending_p |
229d26fc SM |
2646 | && (requested_child->collecting_fast_tracepoint |
2647 | != fast_tpoint_collect_result::not_collecting)) | |
fa593d66 PA |
2648 | { |
2649 | enqueue_one_deferred_signal (requested_child, | |
2650 | &requested_child->status_pending); | |
2651 | requested_child->status_pending_p = 0; | |
2652 | requested_child->status_pending = 0; | |
2653 | linux_resume_one_lwp (requested_child, 0, 0, NULL); | |
2654 | } | |
2655 | ||
2656 | if (requested_child->suspended | |
2657 | && requested_child->status_pending_p) | |
38e08fca GB |
2658 | { |
2659 | internal_error (__FILE__, __LINE__, | |
2660 | "requesting an event out of a" | |
2661 | " suspended child?"); | |
2662 | } | |
fa593d66 | 2663 | |
d50171e4 | 2664 | if (requested_child->status_pending_p) |
d86d4aaf DE |
2665 | { |
2666 | event_child = requested_child; | |
2667 | event_thread = get_lwp_thread (event_child); | |
2668 | } | |
0d62e5e8 | 2669 | } |
611cb4a5 | 2670 | |
0d62e5e8 DJ |
2671 | if (event_child != NULL) |
2672 | { | |
bd99dc85 | 2673 | if (debug_threads) |
87ce2a04 | 2674 | debug_printf ("Got an event from pending child %ld (%04x)\n", |
d86d4aaf | 2675 | lwpid_of (event_thread), event_child->status_pending); |
fa96cb38 | 2676 | *wstatp = event_child->status_pending; |
bd99dc85 PA |
2677 | event_child->status_pending_p = 0; |
2678 | event_child->status_pending = 0; | |
0bfdf32f | 2679 | current_thread = event_thread; |
d86d4aaf | 2680 | return lwpid_of (event_thread); |
0d62e5e8 DJ |
2681 | } |
2682 | ||
fa96cb38 PA |
2683 | /* But if we don't find a pending event, we'll have to wait. |
2684 | ||
2685 | We only enter this loop if no process has a pending wait status. | |
2686 | Thus any action taken in response to a wait status inside this | |
2687 | loop is responding as soon as we detect the status, not after any | |
2688 | pending events. */ | |
d8301ad1 | 2689 | |
fa96cb38 PA |
2690 | /* Make sure SIGCHLD is blocked until the sigsuspend below. Block |
2691 | all signals while here. */ | |
2692 | sigfillset (&block_mask); | |
2693 | sigprocmask (SIG_BLOCK, &block_mask, &prev_mask); | |
2694 | ||
582511be PA |
2695 | /* Always pull all events out of the kernel. We'll randomly select |
2696 | an event LWP out of all that have events, to prevent | |
2697 | starvation. */ | |
fa96cb38 | 2698 | while (event_child == NULL) |
0d62e5e8 | 2699 | { |
fa96cb38 | 2700 | pid_t ret = 0; |
0d62e5e8 | 2701 | |
fa96cb38 PA |
2702 | /* Always use -1 and WNOHANG, due to couple of a kernel/ptrace |
2703 | quirks: | |
0d62e5e8 | 2704 | |
fa96cb38 PA |
2705 | - If the thread group leader exits while other threads in the |
2706 | thread group still exist, waitpid(TGID, ...) hangs. That | |
2707 | waitpid won't return an exit status until the other threads | |
2708 | in the group are reaped. | |
611cb4a5 | 2709 | |
fa96cb38 PA |
2710 | - When a non-leader thread execs, that thread just vanishes |
2711 | without reporting an exit (so we'd hang if we waited for it | |
2712 | explicitly in that case). The exec event is reported to | |
94585166 | 2713 | the TGID pid. */ |
fa96cb38 PA |
2714 | errno = 0; |
2715 | ret = my_waitpid (-1, wstatp, options | WNOHANG); | |
d8301ad1 | 2716 | |
fa96cb38 PA |
2717 | if (debug_threads) |
2718 | debug_printf ("LWFE: waitpid(-1, ...) returned %d, %s\n", | |
2719 | ret, errno ? strerror (errno) : "ERRNO-OK"); | |
0d62e5e8 | 2720 | |
fa96cb38 | 2721 | if (ret > 0) |
0d62e5e8 | 2722 | { |
89be2091 | 2723 | if (debug_threads) |
bd99dc85 | 2724 | { |
fa96cb38 PA |
2725 | debug_printf ("LLW: waitpid %ld received %s\n", |
2726 | (long) ret, status_to_str (*wstatp)); | |
bd99dc85 | 2727 | } |
89be2091 | 2728 | |
582511be PA |
2729 | /* Filter all events. IOW, leave all events pending. We'll |
2730 | randomly select an event LWP out of all that have events | |
2731 | below. */ | |
2732 | linux_low_filter_event (ret, *wstatp); | |
fa96cb38 PA |
2733 | /* Retry until nothing comes out of waitpid. A single |
2734 | SIGCHLD can indicate more than one child stopped. */ | |
89be2091 DJ |
2735 | continue; |
2736 | } | |
2737 | ||
20ba1ce6 PA |
2738 | /* Now that we've pulled all events out of the kernel, resume |
2739 | LWPs that don't have an interesting event to report. */ | |
2740 | if (stopping_threads == NOT_STOPPING_THREADS) | |
f0045347 | 2741 | for_each_thread (resume_stopped_resumed_lwps); |
20ba1ce6 PA |
2742 | |
2743 | /* ... and find an LWP with a status to report to the core, if | |
2744 | any. */ | |
83e1b6c1 SM |
2745 | event_thread = find_thread_in_random ([&] (thread_info *thread) |
2746 | { | |
2747 | return status_pending_p_callback (thread, filter_ptid); | |
2748 | }); | |
2749 | ||
582511be PA |
2750 | if (event_thread != NULL) |
2751 | { | |
2752 | event_child = get_thread_lwp (event_thread); | |
2753 | *wstatp = event_child->status_pending; | |
2754 | event_child->status_pending_p = 0; | |
2755 | event_child->status_pending = 0; | |
2756 | break; | |
2757 | } | |
2758 | ||
fa96cb38 PA |
2759 | /* Check for zombie thread group leaders. Those can't be reaped |
2760 | until all other threads in the thread group are. */ | |
2761 | check_zombie_leaders (); | |
2762 | ||
a1385b7b SM |
2763 | auto not_stopped = [&] (thread_info *thread) |
2764 | { | |
2765 | return not_stopped_callback (thread, wait_ptid); | |
2766 | }; | |
2767 | ||
fa96cb38 PA |
2768 | /* If there are no resumed children left in the set of LWPs we |
2769 | want to wait for, bail. We can't just block in | |
2770 | waitpid/sigsuspend, because lwps might have been left stopped | |
2771 | in trace-stop state, and we'd be stuck forever waiting for | |
2772 | their status to change (which would only happen if we resumed | |
2773 | them). Even if WNOHANG is set, this return code is preferred | |
2774 | over 0 (below), as it is more detailed. */ | |
a1385b7b | 2775 | if (find_thread (not_stopped) == NULL) |
a6dbe5df | 2776 | { |
fa96cb38 PA |
2777 | if (debug_threads) |
2778 | debug_printf ("LLW: exit (no unwaited-for LWP)\n"); | |
2779 | sigprocmask (SIG_SETMASK, &prev_mask, NULL); | |
2780 | return -1; | |
a6dbe5df PA |
2781 | } |
2782 | ||
fa96cb38 PA |
2783 | /* No interesting event to report to the caller. */ |
2784 | if ((options & WNOHANG)) | |
24a09b5f | 2785 | { |
fa96cb38 PA |
2786 | if (debug_threads) |
2787 | debug_printf ("WNOHANG set, no event found\n"); | |
2788 | ||
2789 | sigprocmask (SIG_SETMASK, &prev_mask, NULL); | |
2790 | return 0; | |
24a09b5f DJ |
2791 | } |
2792 | ||
fa96cb38 PA |
2793 | /* Block until we get an event reported with SIGCHLD. */ |
2794 | if (debug_threads) | |
2795 | debug_printf ("sigsuspend'ing\n"); | |
d50171e4 | 2796 | |
fa96cb38 PA |
2797 | sigsuspend (&prev_mask); |
2798 | sigprocmask (SIG_SETMASK, &prev_mask, NULL); | |
2799 | goto retry; | |
2800 | } | |
d50171e4 | 2801 | |
fa96cb38 | 2802 | sigprocmask (SIG_SETMASK, &prev_mask, NULL); |
d50171e4 | 2803 | |
0bfdf32f | 2804 | current_thread = event_thread; |
d50171e4 | 2805 | |
fa96cb38 PA |
2806 | return lwpid_of (event_thread); |
2807 | } | |
2808 | ||
2809 | /* Wait for an event from child(ren) PTID. PTIDs can be: | |
2810 | minus_one_ptid, to specify any child; a pid PTID, specifying all | |
2811 | lwps of a thread group; or a PTID representing a single lwp. Store | |
2812 | the stop status through the status pointer WSTAT. OPTIONS is | |
2813 | passed to the waitpid call. Return 0 if no event was found and | |
2814 | OPTIONS contains WNOHANG. Return -1 if no unwaited-for children | |
2815 | was found. Return the PID of the stopped child otherwise. */ | |
2816 | ||
2817 | static int | |
2818 | linux_wait_for_event (ptid_t ptid, int *wstatp, int options) | |
2819 | { | |
2820 | return linux_wait_for_event_filtered (ptid, ptid, wstatp, options); | |
611cb4a5 DJ |
2821 | } |
2822 | ||
6bf5e0ba PA |
2823 | /* Select one LWP out of those that have events pending. */ |
2824 | ||
2825 | static void | |
2826 | select_event_lwp (struct lwp_info **orig_lp) | |
2827 | { | |
6bf5e0ba | 2828 | int random_selector; |
582511be PA |
2829 | struct thread_info *event_thread = NULL; |
2830 | ||
2831 | /* In all-stop, give preference to the LWP that is being | |
2832 | single-stepped. There will be at most one, and it's the LWP that | |
2833 | the core is most interested in. If we didn't do this, then we'd | |
2834 | have to handle pending step SIGTRAPs somehow in case the core | |
2835 | later continues the previously-stepped thread, otherwise we'd | |
2836 | report the pending SIGTRAP, and the core, not having stepped the | |
2837 | thread, wouldn't understand what the trap was for, and therefore | |
2838 | would report it to the user as a random signal. */ | |
2839 | if (!non_stop) | |
6bf5e0ba | 2840 | { |
39a64da5 SM |
2841 | event_thread = find_thread ([] (thread_info *thread) |
2842 | { | |
2843 | lwp_info *lp = get_thread_lwp (thread); | |
2844 | ||
2845 | return (thread->last_status.kind == TARGET_WAITKIND_IGNORE | |
2846 | && thread->last_resume_kind == resume_step | |
2847 | && lp->status_pending_p); | |
2848 | }); | |
2849 | ||
582511be PA |
2850 | if (event_thread != NULL) |
2851 | { | |
2852 | if (debug_threads) | |
2853 | debug_printf ("SEL: Select single-step %s\n", | |
2854 | target_pid_to_str (ptid_of (event_thread))); | |
2855 | } | |
6bf5e0ba | 2856 | } |
582511be | 2857 | if (event_thread == NULL) |
6bf5e0ba PA |
2858 | { |
2859 | /* No single-stepping LWP. Select one at random, out of those | |
b90fc188 | 2860 | which have had events. */ |
6bf5e0ba | 2861 | |
b90fc188 | 2862 | /* First see how many events we have. */ |
39a64da5 SM |
2863 | int num_events = 0; |
2864 | for_each_thread ([&] (thread_info *thread) | |
2865 | { | |
2866 | lwp_info *lp = get_thread_lwp (thread); | |
2867 | ||
2868 | /* Count only resumed LWPs that have an event pending. */ | |
2869 | if (thread->last_status.kind == TARGET_WAITKIND_IGNORE | |
2870 | && lp->status_pending_p) | |
2871 | num_events++; | |
2872 | }); | |
8bf3b159 | 2873 | gdb_assert (num_events > 0); |
6bf5e0ba | 2874 | |
b90fc188 PA |
2875 | /* Now randomly pick a LWP out of those that have had |
2876 | events. */ | |
6bf5e0ba PA |
2877 | random_selector = (int) |
2878 | ((num_events * (double) rand ()) / (RAND_MAX + 1.0)); | |
2879 | ||
2880 | if (debug_threads && num_events > 1) | |
87ce2a04 DE |
2881 | debug_printf ("SEL: Found %d SIGTRAP events, selecting #%d\n", |
2882 | num_events, random_selector); | |
6bf5e0ba | 2883 | |
39a64da5 SM |
2884 | event_thread = find_thread ([&] (thread_info *thread) |
2885 | { | |
2886 | lwp_info *lp = get_thread_lwp (thread); | |
2887 | ||
2888 | /* Select only resumed LWPs that have an event pending. */ | |
2889 | if (thread->last_status.kind == TARGET_WAITKIND_IGNORE | |
2890 | && lp->status_pending_p) | |
2891 | if (random_selector-- == 0) | |
2892 | return true; | |
2893 | ||
2894 | return false; | |
2895 | }); | |
6bf5e0ba PA |
2896 | } |
2897 | ||
d86d4aaf | 2898 | if (event_thread != NULL) |
6bf5e0ba | 2899 | { |
d86d4aaf DE |
2900 | struct lwp_info *event_lp = get_thread_lwp (event_thread); |
2901 | ||
6bf5e0ba PA |
2902 | /* Switch the event LWP. */ |
2903 | *orig_lp = event_lp; | |
2904 | } | |
2905 | } | |
2906 | ||
7984d532 PA |
2907 | /* Decrement the suspend count of all LWPs, except EXCEPT, if non |
2908 | NULL. */ | |
2909 | ||
2910 | static void | |
2911 | unsuspend_all_lwps (struct lwp_info *except) | |
2912 | { | |
139720c5 SM |
2913 | for_each_thread ([&] (thread_info *thread) |
2914 | { | |
2915 | lwp_info *lwp = get_thread_lwp (thread); | |
2916 | ||
2917 | if (lwp != except) | |
2918 | lwp_suspended_decr (lwp); | |
2919 | }); | |
7984d532 PA |
2920 | } |
2921 | ||
9c80ecd6 | 2922 | static void move_out_of_jump_pad_callback (thread_info *thread); |
fcb056a5 | 2923 | static bool stuck_in_jump_pad_callback (thread_info *thread); |
5a6b0a41 | 2924 | static bool lwp_running (thread_info *thread); |
fa593d66 PA |
2925 | static ptid_t linux_wait_1 (ptid_t ptid, |
2926 | struct target_waitstatus *ourstatus, | |
2927 | int target_options); | |
2928 | ||
2929 | /* Stabilize threads (move out of jump pads). | |
2930 | ||
2931 | If a thread is midway collecting a fast tracepoint, we need to | |
2932 | finish the collection and move it out of the jump pad before | |
2933 | reporting the signal. | |
2934 | ||
2935 | This avoids recursion while collecting (when a signal arrives | |
2936 | midway, and the signal handler itself collects), which would trash | |
2937 | the trace buffer. In case the user set a breakpoint in a signal | |
2938 | handler, this avoids the backtrace showing the jump pad, etc.. | |
2939 | Most importantly, there are certain things we can't do safely if | |
2940 | threads are stopped in a jump pad (or in its callee's). For | |
2941 | example: | |
2942 | ||
2943 | - starting a new trace run. A thread still collecting the | |
2944 | previous run, could trash the trace buffer when resumed. The trace | |
2945 | buffer control structures would have been reset but the thread had | |
2946 | no way to tell. The thread could even midway memcpy'ing to the | |
2947 | buffer, which would mean that when resumed, it would clobber the | |
2948 | trace buffer that had been set for a new run. | |
2949 | ||
2950 | - we can't rewrite/reuse the jump pads for new tracepoints | |
2951 | safely. Say you do tstart while a thread is stopped midway while | |
2952 | collecting. When the thread is later resumed, it finishes the | |
2953 | collection, and returns to the jump pad, to execute the original | |
2954 | instruction that was under the tracepoint jump at the time the | |
2955 | older run had been started. If the jump pad had been rewritten | |
2956 | since for something else in the new run, the thread would now | |
2957 | execute the wrong / random instructions. */ | |
2958 | ||
2959 | static void | |
2960 | linux_stabilize_threads (void) | |
2961 | { | |
fcb056a5 | 2962 | thread_info *thread_stuck = find_thread (stuck_in_jump_pad_callback); |
fa593d66 | 2963 | |
d86d4aaf | 2964 | if (thread_stuck != NULL) |
fa593d66 | 2965 | { |
b4d51a55 | 2966 | if (debug_threads) |
87ce2a04 | 2967 | debug_printf ("can't stabilize, LWP %ld is stuck in jump pad\n", |
d86d4aaf | 2968 | lwpid_of (thread_stuck)); |
fa593d66 PA |
2969 | return; |
2970 | } | |
2971 | ||
fcb056a5 | 2972 | thread_info *saved_thread = current_thread; |
fa593d66 PA |
2973 | |
2974 | stabilizing_threads = 1; | |
2975 | ||
2976 | /* Kick 'em all. */ | |
f0045347 | 2977 | for_each_thread (move_out_of_jump_pad_callback); |
fa593d66 PA |
2978 | |
2979 | /* Loop until all are stopped out of the jump pads. */ | |
5a6b0a41 | 2980 | while (find_thread (lwp_running) != NULL) |
fa593d66 PA |
2981 | { |
2982 | struct target_waitstatus ourstatus; | |
2983 | struct lwp_info *lwp; | |
fa593d66 PA |
2984 | int wstat; |
2985 | ||
2986 | /* Note that we go through the full wait even loop. While | |
2987 | moving threads out of jump pad, we need to be able to step | |
2988 | over internal breakpoints and such. */ | |
32fcada3 | 2989 | linux_wait_1 (minus_one_ptid, &ourstatus, 0); |
fa593d66 PA |
2990 | |
2991 | if (ourstatus.kind == TARGET_WAITKIND_STOPPED) | |
2992 | { | |
0bfdf32f | 2993 | lwp = get_thread_lwp (current_thread); |
fa593d66 PA |
2994 | |
2995 | /* Lock it. */ | |
863d01bd | 2996 | lwp_suspended_inc (lwp); |
fa593d66 | 2997 | |
a493e3e2 | 2998 | if (ourstatus.value.sig != GDB_SIGNAL_0 |
0bfdf32f | 2999 | || current_thread->last_resume_kind == resume_stop) |
fa593d66 | 3000 | { |
2ea28649 | 3001 | wstat = W_STOPCODE (gdb_signal_to_host (ourstatus.value.sig)); |
fa593d66 PA |
3002 | enqueue_one_deferred_signal (lwp, &wstat); |
3003 | } | |
3004 | } | |
3005 | } | |
3006 | ||
fcdad592 | 3007 | unsuspend_all_lwps (NULL); |
fa593d66 PA |
3008 | |
3009 | stabilizing_threads = 0; | |
3010 | ||
0bfdf32f | 3011 | current_thread = saved_thread; |
fa593d66 | 3012 | |
b4d51a55 | 3013 | if (debug_threads) |
fa593d66 | 3014 | { |
fcb056a5 SM |
3015 | thread_stuck = find_thread (stuck_in_jump_pad_callback); |
3016 | ||
d86d4aaf | 3017 | if (thread_stuck != NULL) |
87ce2a04 | 3018 | debug_printf ("couldn't stabilize, LWP %ld got stuck in jump pad\n", |
d86d4aaf | 3019 | lwpid_of (thread_stuck)); |
fa593d66 PA |
3020 | } |
3021 | } | |
3022 | ||
582511be PA |
3023 | /* Convenience function that is called when the kernel reports an |
3024 | event that is not passed out to GDB. */ | |
3025 | ||
3026 | static ptid_t | |
3027 | ignore_event (struct target_waitstatus *ourstatus) | |
3028 | { | |
3029 | /* If we got an event, there may still be others, as a single | |
3030 | SIGCHLD can indicate more than one child stopped. This forces | |
3031 | another target_wait call. */ | |
3032 | async_file_mark (); | |
3033 | ||
3034 | ourstatus->kind = TARGET_WAITKIND_IGNORE; | |
3035 | return null_ptid; | |
3036 | } | |
3037 | ||
65706a29 PA |
3038 | /* Convenience function that is called when the kernel reports an exit |
3039 | event. This decides whether to report the event to GDB as a | |
3040 | process exit event, a thread exit event, or to suppress the | |
3041 | event. */ | |
3042 | ||
3043 | static ptid_t | |
3044 | filter_exit_event (struct lwp_info *event_child, | |
3045 | struct target_waitstatus *ourstatus) | |
3046 | { | |
c12a5089 | 3047 | client_state &cs = get_client_state (); |
65706a29 PA |
3048 | struct thread_info *thread = get_lwp_thread (event_child); |
3049 | ptid_t ptid = ptid_of (thread); | |
3050 | ||
3051 | if (!last_thread_of_process_p (pid_of (thread))) | |
3052 | { | |
c12a5089 | 3053 | if (cs.report_thread_events) |
65706a29 PA |
3054 | ourstatus->kind = TARGET_WAITKIND_THREAD_EXITED; |
3055 | else | |
3056 | ourstatus->kind = TARGET_WAITKIND_IGNORE; | |
3057 | ||
3058 | delete_lwp (event_child); | |
3059 | } | |
3060 | return ptid; | |
3061 | } | |
3062 | ||
82075af2 JS |
3063 | /* Returns 1 if GDB is interested in any event_child syscalls. */ |
3064 | ||
3065 | static int | |
3066 | gdb_catching_syscalls_p (struct lwp_info *event_child) | |
3067 | { | |
3068 | struct thread_info *thread = get_lwp_thread (event_child); | |
3069 | struct process_info *proc = get_thread_process (thread); | |
3070 | ||
f27866ba | 3071 | return !proc->syscalls_to_catch.empty (); |
82075af2 JS |
3072 | } |
3073 | ||
3074 | /* Returns 1 if GDB is interested in the event_child syscall. | |
3075 | Only to be called when stopped reason is SYSCALL_SIGTRAP. */ | |
3076 | ||
3077 | static int | |
3078 | gdb_catch_this_syscall_p (struct lwp_info *event_child) | |
3079 | { | |
4cc32bec | 3080 | int sysno; |
82075af2 JS |
3081 | struct thread_info *thread = get_lwp_thread (event_child); |
3082 | struct process_info *proc = get_thread_process (thread); | |
3083 | ||
f27866ba | 3084 | if (proc->syscalls_to_catch.empty ()) |
82075af2 JS |
3085 | return 0; |
3086 | ||
f27866ba | 3087 | if (proc->syscalls_to_catch[0] == ANY_SYSCALL) |
82075af2 JS |
3088 | return 1; |
3089 | ||
4cc32bec | 3090 | get_syscall_trapinfo (event_child, &sysno); |
f27866ba SM |
3091 | |
3092 | for (int iter : proc->syscalls_to_catch) | |
82075af2 JS |
3093 | if (iter == sysno) |
3094 | return 1; | |
3095 | ||
3096 | return 0; | |
3097 | } | |
3098 | ||
0d62e5e8 | 3099 | /* Wait for process, returns status. */ |
da6d8c04 | 3100 | |
95954743 PA |
3101 | static ptid_t |
3102 | linux_wait_1 (ptid_t ptid, | |
3103 | struct target_waitstatus *ourstatus, int target_options) | |
da6d8c04 | 3104 | { |
c12a5089 | 3105 | client_state &cs = get_client_state (); |
e5f1222d | 3106 | int w; |
fc7238bb | 3107 | struct lwp_info *event_child; |
bd99dc85 | 3108 | int options; |
bd99dc85 | 3109 | int pid; |
6bf5e0ba PA |
3110 | int step_over_finished; |
3111 | int bp_explains_trap; | |
3112 | int maybe_internal_trap; | |
3113 | int report_to_gdb; | |
219f2f23 | 3114 | int trace_event; |
c2d6af84 | 3115 | int in_step_range; |
f2faf941 | 3116 | int any_resumed; |
bd99dc85 | 3117 | |
87ce2a04 DE |
3118 | if (debug_threads) |
3119 | { | |
3120 | debug_enter (); | |
3121 | debug_printf ("linux_wait_1: [%s]\n", target_pid_to_str (ptid)); | |
3122 | } | |
3123 | ||
bd99dc85 PA |
3124 | /* Translate generic target options into linux options. */ |
3125 | options = __WALL; | |
3126 | if (target_options & TARGET_WNOHANG) | |
3127 | options |= WNOHANG; | |
0d62e5e8 | 3128 | |
fa593d66 PA |
3129 | bp_explains_trap = 0; |
3130 | trace_event = 0; | |
c2d6af84 | 3131 | in_step_range = 0; |
bd99dc85 PA |
3132 | ourstatus->kind = TARGET_WAITKIND_IGNORE; |
3133 | ||
83e1b6c1 SM |
3134 | auto status_pending_p_any = [&] (thread_info *thread) |
3135 | { | |
3136 | return status_pending_p_callback (thread, minus_one_ptid); | |
3137 | }; | |
3138 | ||
a1385b7b SM |
3139 | auto not_stopped = [&] (thread_info *thread) |
3140 | { | |
3141 | return not_stopped_callback (thread, minus_one_ptid); | |
3142 | }; | |
3143 | ||
f2faf941 | 3144 | /* Find a resumed LWP, if any. */ |
83e1b6c1 | 3145 | if (find_thread (status_pending_p_any) != NULL) |
f2faf941 | 3146 | any_resumed = 1; |
a1385b7b | 3147 | else if (find_thread (not_stopped) != NULL) |
f2faf941 PA |
3148 | any_resumed = 1; |
3149 | else | |
3150 | any_resumed = 0; | |
3151 | ||
d7e15655 | 3152 | if (step_over_bkpt == null_ptid) |
6bf5e0ba PA |
3153 | pid = linux_wait_for_event (ptid, &w, options); |
3154 | else | |
3155 | { | |
3156 | if (debug_threads) | |
87ce2a04 DE |
3157 | debug_printf ("step_over_bkpt set [%s], doing a blocking wait\n", |
3158 | target_pid_to_str (step_over_bkpt)); | |
6bf5e0ba PA |
3159 | pid = linux_wait_for_event (step_over_bkpt, &w, options & ~WNOHANG); |
3160 | } | |
3161 | ||
f2faf941 | 3162 | if (pid == 0 || (pid == -1 && !any_resumed)) |
87ce2a04 | 3163 | { |
fa96cb38 PA |
3164 | gdb_assert (target_options & TARGET_WNOHANG); |
3165 | ||
87ce2a04 DE |
3166 | if (debug_threads) |
3167 | { | |
fa96cb38 PA |
3168 | debug_printf ("linux_wait_1 ret = null_ptid, " |
3169 | "TARGET_WAITKIND_IGNORE\n"); | |
87ce2a04 DE |
3170 | debug_exit (); |
3171 | } | |
fa96cb38 PA |
3172 | |
3173 | ourstatus->kind = TARGET_WAITKIND_IGNORE; | |
87ce2a04 DE |
3174 | return null_ptid; |
3175 | } | |
fa96cb38 PA |
3176 | else if (pid == -1) |
3177 | { | |
3178 | if (debug_threads) | |
3179 | { | |
3180 | debug_printf ("linux_wait_1 ret = null_ptid, " | |
3181 | "TARGET_WAITKIND_NO_RESUMED\n"); | |
3182 | debug_exit (); | |
3183 | } | |
bd99dc85 | 3184 | |
fa96cb38 PA |
3185 | ourstatus->kind = TARGET_WAITKIND_NO_RESUMED; |
3186 | return null_ptid; | |
3187 | } | |
0d62e5e8 | 3188 | |
0bfdf32f | 3189 | event_child = get_thread_lwp (current_thread); |
0d62e5e8 | 3190 | |
fa96cb38 PA |
3191 | /* linux_wait_for_event only returns an exit status for the last |
3192 | child of a process. Report it. */ | |
3193 | if (WIFEXITED (w) || WIFSIGNALED (w)) | |
da6d8c04 | 3194 | { |
fa96cb38 | 3195 | if (WIFEXITED (w)) |
0d62e5e8 | 3196 | { |
fa96cb38 PA |
3197 | ourstatus->kind = TARGET_WAITKIND_EXITED; |
3198 | ourstatus->value.integer = WEXITSTATUS (w); | |
bd99dc85 | 3199 | |
fa96cb38 | 3200 | if (debug_threads) |
bd99dc85 | 3201 | { |
fa96cb38 PA |
3202 | debug_printf ("linux_wait_1 ret = %s, exited with " |
3203 | "retcode %d\n", | |
0bfdf32f | 3204 | target_pid_to_str (ptid_of (current_thread)), |
fa96cb38 PA |
3205 | WEXITSTATUS (w)); |
3206 | debug_exit (); | |
bd99dc85 | 3207 | } |
fa96cb38 PA |
3208 | } |
3209 | else | |
3210 | { | |
3211 | ourstatus->kind = TARGET_WAITKIND_SIGNALLED; | |
3212 | ourstatus->value.sig = gdb_signal_from_host (WTERMSIG (w)); | |
5b1c542e | 3213 | |
fa96cb38 PA |
3214 | if (debug_threads) |
3215 | { | |
3216 | debug_printf ("linux_wait_1 ret = %s, terminated with " | |
3217 | "signal %d\n", | |
0bfdf32f | 3218 | target_pid_to_str (ptid_of (current_thread)), |
fa96cb38 PA |
3219 | WTERMSIG (w)); |
3220 | debug_exit (); | |
3221 | } | |
0d62e5e8 | 3222 | } |
fa96cb38 | 3223 | |
65706a29 PA |
3224 | if (ourstatus->kind == TARGET_WAITKIND_EXITED) |
3225 | return filter_exit_event (event_child, ourstatus); | |
3226 | ||
0bfdf32f | 3227 | return ptid_of (current_thread); |
da6d8c04 DJ |
3228 | } |
3229 | ||
2d97cd35 AT |
3230 | /* If step-over executes a breakpoint instruction, in the case of a |
3231 | hardware single step it means a gdb/gdbserver breakpoint had been | |
3232 | planted on top of a permanent breakpoint, in the case of a software | |
3233 | single step it may just mean that gdbserver hit the reinsert breakpoint. | |
e7ad2f14 | 3234 | The PC has been adjusted by save_stop_reason to point at |
2d97cd35 AT |
3235 | the breakpoint address. |
3236 | So in the case of the hardware single step advance the PC manually | |
3237 | past the breakpoint and in the case of software single step advance only | |
3b9a79ef | 3238 | if it's not the single_step_breakpoint we are hitting. |
2d97cd35 AT |
3239 | This avoids that a program would keep trapping a permanent breakpoint |
3240 | forever. */ | |
d7e15655 | 3241 | if (step_over_bkpt != null_ptid |
2d97cd35 AT |
3242 | && event_child->stop_reason == TARGET_STOPPED_BY_SW_BREAKPOINT |
3243 | && (event_child->stepping | |
3b9a79ef | 3244 | || !single_step_breakpoint_inserted_here (event_child->stop_pc))) |
8090aef2 | 3245 | { |
dd373349 AT |
3246 | int increment_pc = 0; |
3247 | int breakpoint_kind = 0; | |
3248 | CORE_ADDR stop_pc = event_child->stop_pc; | |
3249 | ||
769ef81f AT |
3250 | breakpoint_kind = |
3251 | the_target->breakpoint_kind_from_current_state (&stop_pc); | |
dd373349 | 3252 | the_target->sw_breakpoint_from_kind (breakpoint_kind, &increment_pc); |
8090aef2 PA |
3253 | |
3254 | if (debug_threads) | |
3255 | { | |
3256 | debug_printf ("step-over for %s executed software breakpoint\n", | |
3257 | target_pid_to_str (ptid_of (current_thread))); | |
3258 | } | |
3259 | ||
3260 | if (increment_pc != 0) | |
3261 | { | |
3262 | struct regcache *regcache | |
3263 | = get_thread_regcache (current_thread, 1); | |
3264 | ||
3265 | event_child->stop_pc += increment_pc; | |
3266 | (*the_low_target.set_pc) (regcache, event_child->stop_pc); | |
3267 | ||
3268 | if (!(*the_low_target.breakpoint_at) (event_child->stop_pc)) | |
15c66dd6 | 3269 | event_child->stop_reason = TARGET_STOPPED_BY_NO_REASON; |
8090aef2 PA |
3270 | } |
3271 | } | |
3272 | ||
6bf5e0ba PA |
3273 | /* If this event was not handled before, and is not a SIGTRAP, we |
3274 | report it. SIGILL and SIGSEGV are also treated as traps in case | |
3275 | a breakpoint is inserted at the current PC. If this target does | |
3276 | not support internal breakpoints at all, we also report the | |
3277 | SIGTRAP without further processing; it's of no concern to us. */ | |
3278 | maybe_internal_trap | |
3279 | = (supports_breakpoints () | |
3280 | && (WSTOPSIG (w) == SIGTRAP | |
3281 | || ((WSTOPSIG (w) == SIGILL | |
3282 | || WSTOPSIG (w) == SIGSEGV) | |
3283 | && (*the_low_target.breakpoint_at) (event_child->stop_pc)))); | |
3284 | ||
3285 | if (maybe_internal_trap) | |
3286 | { | |
3287 | /* Handle anything that requires bookkeeping before deciding to | |
3288 | report the event or continue waiting. */ | |
3289 | ||
3290 | /* First check if we can explain the SIGTRAP with an internal | |
3291 | breakpoint, or if we should possibly report the event to GDB. | |
3292 | Do this before anything that may remove or insert a | |
3293 | breakpoint. */ | |
3294 | bp_explains_trap = breakpoint_inserted_here (event_child->stop_pc); | |
3295 | ||
3296 | /* We have a SIGTRAP, possibly a step-over dance has just | |
3297 | finished. If so, tweak the state machine accordingly, | |
3b9a79ef YQ |
3298 | reinsert breakpoints and delete any single-step |
3299 | breakpoints. */ | |
6bf5e0ba PA |
3300 | step_over_finished = finish_step_over (event_child); |
3301 | ||
3302 | /* Now invoke the callbacks of any internal breakpoints there. */ | |
3303 | check_breakpoints (event_child->stop_pc); | |
3304 | ||
219f2f23 PA |
3305 | /* Handle tracepoint data collecting. This may overflow the |
3306 | trace buffer, and cause a tracing stop, removing | |
3307 | breakpoints. */ | |
3308 | trace_event = handle_tracepoints (event_child); | |
3309 | ||
6bf5e0ba PA |
3310 | if (bp_explains_trap) |
3311 | { | |
6bf5e0ba | 3312 | if (debug_threads) |
87ce2a04 | 3313 | debug_printf ("Hit a gdbserver breakpoint.\n"); |
6bf5e0ba PA |
3314 | } |
3315 | } | |
3316 | else | |
3317 | { | |
3318 | /* We have some other signal, possibly a step-over dance was in | |
3319 | progress, and it should be cancelled too. */ | |
3320 | step_over_finished = finish_step_over (event_child); | |
fa593d66 PA |
3321 | } |
3322 | ||
3323 | /* We have all the data we need. Either report the event to GDB, or | |
3324 | resume threads and keep waiting for more. */ | |
3325 | ||
3326 | /* If we're collecting a fast tracepoint, finish the collection and | |
3327 | move out of the jump pad before delivering a signal. See | |
3328 | linux_stabilize_threads. */ | |
3329 | ||
3330 | if (WIFSTOPPED (w) | |
3331 | && WSTOPSIG (w) != SIGTRAP | |
3332 | && supports_fast_tracepoints () | |
58b4daa5 | 3333 | && agent_loaded_p ()) |
fa593d66 PA |
3334 | { |
3335 | if (debug_threads) | |
87ce2a04 DE |
3336 | debug_printf ("Got signal %d for LWP %ld. Check if we need " |
3337 | "to defer or adjust it.\n", | |
0bfdf32f | 3338 | WSTOPSIG (w), lwpid_of (current_thread)); |
fa593d66 PA |
3339 | |
3340 | /* Allow debugging the jump pad itself. */ | |
0bfdf32f | 3341 | if (current_thread->last_resume_kind != resume_step |
fa593d66 PA |
3342 | && maybe_move_out_of_jump_pad (event_child, &w)) |
3343 | { | |
3344 | enqueue_one_deferred_signal (event_child, &w); | |
3345 | ||
3346 | if (debug_threads) | |
87ce2a04 | 3347 | debug_printf ("Signal %d for LWP %ld deferred (in jump pad)\n", |
0bfdf32f | 3348 | WSTOPSIG (w), lwpid_of (current_thread)); |
fa593d66 PA |
3349 | |
3350 | linux_resume_one_lwp (event_child, 0, 0, NULL); | |
582511be | 3351 | |
edeeb602 YQ |
3352 | if (debug_threads) |
3353 | debug_exit (); | |
582511be | 3354 | return ignore_event (ourstatus); |
fa593d66 PA |
3355 | } |
3356 | } | |
219f2f23 | 3357 | |
229d26fc SM |
3358 | if (event_child->collecting_fast_tracepoint |
3359 | != fast_tpoint_collect_result::not_collecting) | |
fa593d66 PA |
3360 | { |
3361 | if (debug_threads) | |
87ce2a04 DE |
3362 | debug_printf ("LWP %ld was trying to move out of the jump pad (%d). " |
3363 | "Check if we're already there.\n", | |
0bfdf32f | 3364 | lwpid_of (current_thread), |
229d26fc | 3365 | (int) event_child->collecting_fast_tracepoint); |
fa593d66 PA |
3366 | |
3367 | trace_event = 1; | |
3368 | ||
3369 | event_child->collecting_fast_tracepoint | |
3370 | = linux_fast_tracepoint_collecting (event_child, NULL); | |
3371 | ||
229d26fc SM |
3372 | if (event_child->collecting_fast_tracepoint |
3373 | != fast_tpoint_collect_result::before_insn) | |
fa593d66 PA |
3374 | { |
3375 | /* No longer need this breakpoint. */ | |
3376 | if (event_child->exit_jump_pad_bkpt != NULL) | |
3377 | { | |
3378 | if (debug_threads) | |
87ce2a04 DE |
3379 | debug_printf ("No longer need exit-jump-pad bkpt; removing it." |
3380 | "stopping all threads momentarily.\n"); | |
fa593d66 PA |
3381 | |
3382 | /* Other running threads could hit this breakpoint. | |
3383 | We don't handle moribund locations like GDB does, | |
3384 | instead we always pause all threads when removing | |
3385 | breakpoints, so that any step-over or | |
3386 | decr_pc_after_break adjustment is always taken | |
3387 | care of while the breakpoint is still | |
3388 | inserted. */ | |
3389 | stop_all_lwps (1, event_child); | |
fa593d66 PA |
3390 | |
3391 | delete_breakpoint (event_child->exit_jump_pad_bkpt); | |
3392 | event_child->exit_jump_pad_bkpt = NULL; | |
3393 | ||
3394 | unstop_all_lwps (1, event_child); | |
3395 | ||
3396 | gdb_assert (event_child->suspended >= 0); | |
3397 | } | |
3398 | } | |
3399 | ||
229d26fc SM |
3400 | if (event_child->collecting_fast_tracepoint |
3401 | == fast_tpoint_collect_result::not_collecting) | |
fa593d66 PA |
3402 | { |
3403 | if (debug_threads) | |
87ce2a04 DE |
3404 | debug_printf ("fast tracepoint finished " |
3405 | "collecting successfully.\n"); | |
fa593d66 PA |
3406 | |
3407 | /* We may have a deferred signal to report. */ | |
3408 | if (dequeue_one_deferred_signal (event_child, &w)) | |
3409 | { | |
3410 | if (debug_threads) | |
87ce2a04 | 3411 | debug_printf ("dequeued one signal.\n"); |
fa593d66 | 3412 | } |
3c11dd79 | 3413 | else |
fa593d66 | 3414 | { |
3c11dd79 | 3415 | if (debug_threads) |
87ce2a04 | 3416 | debug_printf ("no deferred signals.\n"); |
fa593d66 PA |
3417 | |
3418 | if (stabilizing_threads) | |
3419 | { | |
3420 | ourstatus->kind = TARGET_WAITKIND_STOPPED; | |
a493e3e2 | 3421 | ourstatus->value.sig = GDB_SIGNAL_0; |
87ce2a04 DE |
3422 | |
3423 | if (debug_threads) | |
3424 | { | |
3425 | debug_printf ("linux_wait_1 ret = %s, stopped " | |
3426 | "while stabilizing threads\n", | |
0bfdf32f | 3427 | target_pid_to_str (ptid_of (current_thread))); |
87ce2a04 DE |
3428 | debug_exit (); |
3429 | } | |
3430 | ||
0bfdf32f | 3431 | return ptid_of (current_thread); |
fa593d66 PA |
3432 | } |
3433 | } | |
3434 | } | |
6bf5e0ba PA |
3435 | } |
3436 | ||
e471f25b PA |
3437 | /* Check whether GDB would be interested in this event. */ |
3438 | ||
82075af2 JS |
3439 | /* Check if GDB is interested in this syscall. */ |
3440 | if (WIFSTOPPED (w) | |
3441 | && WSTOPSIG (w) == SYSCALL_SIGTRAP | |
3442 | && !gdb_catch_this_syscall_p (event_child)) | |
3443 | { | |
3444 | if (debug_threads) | |
3445 | { | |
3446 | debug_printf ("Ignored syscall for LWP %ld.\n", | |
3447 | lwpid_of (current_thread)); | |
3448 | } | |
3449 | ||
3450 | linux_resume_one_lwp (event_child, event_child->stepping, | |
3451 | 0, NULL); | |
edeeb602 YQ |
3452 | |
3453 | if (debug_threads) | |
3454 | debug_exit (); | |
82075af2 JS |
3455 | return ignore_event (ourstatus); |
3456 | } | |
3457 | ||
e471f25b PA |
3458 | /* If GDB is not interested in this signal, don't stop other |
3459 | threads, and don't report it to GDB. Just resume the inferior | |
3460 | right away. We do this for threading-related signals as well as | |
3461 | any that GDB specifically requested we ignore. But never ignore | |
3462 | SIGSTOP if we sent it ourselves, and do not ignore signals when | |
3463 | stepping - they may require special handling to skip the signal | |
c9587f88 AT |
3464 | handler. Also never ignore signals that could be caused by a |
3465 | breakpoint. */ | |
e471f25b | 3466 | if (WIFSTOPPED (w) |
0bfdf32f | 3467 | && current_thread->last_resume_kind != resume_step |
e471f25b | 3468 | && ( |
1a981360 | 3469 | #if defined (USE_THREAD_DB) && !defined (__ANDROID__) |
fe978cb0 | 3470 | (current_process ()->priv->thread_db != NULL |
e471f25b PA |
3471 | && (WSTOPSIG (w) == __SIGRTMIN |
3472 | || WSTOPSIG (w) == __SIGRTMIN + 1)) | |
3473 | || | |
3474 | #endif | |
c12a5089 | 3475 | (cs.pass_signals[gdb_signal_from_host (WSTOPSIG (w))] |
e471f25b | 3476 | && !(WSTOPSIG (w) == SIGSTOP |
c9587f88 AT |
3477 | && current_thread->last_resume_kind == resume_stop) |
3478 | && !linux_wstatus_maybe_breakpoint (w)))) | |
e471f25b PA |
3479 | { |
3480 | siginfo_t info, *info_p; | |
3481 | ||
3482 | if (debug_threads) | |
87ce2a04 | 3483 | debug_printf ("Ignored signal %d for LWP %ld.\n", |
0bfdf32f | 3484 | WSTOPSIG (w), lwpid_of (current_thread)); |
e471f25b | 3485 | |
0bfdf32f | 3486 | if (ptrace (PTRACE_GETSIGINFO, lwpid_of (current_thread), |
b8e1b30e | 3487 | (PTRACE_TYPE_ARG3) 0, &info) == 0) |
e471f25b PA |
3488 | info_p = &info; |
3489 | else | |
3490 | info_p = NULL; | |
863d01bd PA |
3491 | |
3492 | if (step_over_finished) | |
3493 | { | |
3494 | /* We cancelled this thread's step-over above. We still | |
3495 | need to unsuspend all other LWPs, and set them back | |
3496 | running again while the signal handler runs. */ | |
3497 | unsuspend_all_lwps (event_child); | |
3498 | ||
3499 | /* Enqueue the pending signal info so that proceed_all_lwps | |
3500 | doesn't lose it. */ | |
3501 | enqueue_pending_signal (event_child, WSTOPSIG (w), info_p); | |
3502 | ||
3503 | proceed_all_lwps (); | |
3504 | } | |
3505 | else | |
3506 | { | |
3507 | linux_resume_one_lwp (event_child, event_child->stepping, | |
3508 | WSTOPSIG (w), info_p); | |
3509 | } | |
edeeb602 YQ |
3510 | |
3511 | if (debug_threads) | |
3512 | debug_exit (); | |
3513 | ||
582511be | 3514 | return ignore_event (ourstatus); |
e471f25b PA |
3515 | } |
3516 | ||
c2d6af84 PA |
3517 | /* Note that all addresses are always "out of the step range" when |
3518 | there's no range to begin with. */ | |
3519 | in_step_range = lwp_in_step_range (event_child); | |
3520 | ||
3521 | /* If GDB wanted this thread to single step, and the thread is out | |
3522 | of the step range, we always want to report the SIGTRAP, and let | |
3523 | GDB handle it. Watchpoints should always be reported. So should | |
3524 | signals we can't explain. A SIGTRAP we can't explain could be a | |
3525 | GDB breakpoint --- we may or not support Z0 breakpoints. If we | |
3526 | do, we're be able to handle GDB breakpoints on top of internal | |
3527 | breakpoints, by handling the internal breakpoint and still | |
3528 | reporting the event to GDB. If we don't, we're out of luck, GDB | |
863d01bd PA |
3529 | won't see the breakpoint hit. If we see a single-step event but |
3530 | the thread should be continuing, don't pass the trap to gdb. | |
3531 | That indicates that we had previously finished a single-step but | |
3532 | left the single-step pending -- see | |
3533 | complete_ongoing_step_over. */ | |
6bf5e0ba | 3534 | report_to_gdb = (!maybe_internal_trap |
0bfdf32f | 3535 | || (current_thread->last_resume_kind == resume_step |
c2d6af84 | 3536 | && !in_step_range) |
15c66dd6 | 3537 | || event_child->stop_reason == TARGET_STOPPED_BY_WATCHPOINT |
863d01bd PA |
3538 | || (!in_step_range |
3539 | && !bp_explains_trap | |
3540 | && !trace_event | |
3541 | && !step_over_finished | |
3542 | && !(current_thread->last_resume_kind == resume_continue | |
3543 | && event_child->stop_reason == TARGET_STOPPED_BY_SINGLE_STEP)) | |
9f3a5c85 | 3544 | || (gdb_breakpoint_here (event_child->stop_pc) |
d3ce09f5 | 3545 | && gdb_condition_true_at_breakpoint (event_child->stop_pc) |
de0d863e | 3546 | && gdb_no_commands_at_breakpoint (event_child->stop_pc)) |
00db26fa | 3547 | || event_child->waitstatus.kind != TARGET_WAITKIND_IGNORE); |
d3ce09f5 SS |
3548 | |
3549 | run_breakpoint_commands (event_child->stop_pc); | |
6bf5e0ba PA |
3550 | |
3551 | /* We found no reason GDB would want us to stop. We either hit one | |
3552 | of our own breakpoints, or finished an internal step GDB | |
3553 | shouldn't know about. */ | |
3554 | if (!report_to_gdb) | |
3555 | { | |
3556 | if (debug_threads) | |
3557 | { | |
3558 | if (bp_explains_trap) | |
87ce2a04 | 3559 | debug_printf ("Hit a gdbserver breakpoint.\n"); |
6bf5e0ba | 3560 | if (step_over_finished) |
87ce2a04 | 3561 | debug_printf ("Step-over finished.\n"); |
219f2f23 | 3562 | if (trace_event) |
87ce2a04 | 3563 | debug_printf ("Tracepoint event.\n"); |
c2d6af84 | 3564 | if (lwp_in_step_range (event_child)) |
87ce2a04 DE |
3565 | debug_printf ("Range stepping pc 0x%s [0x%s, 0x%s).\n", |
3566 | paddress (event_child->stop_pc), | |
3567 | paddress (event_child->step_range_start), | |
3568 | paddress (event_child->step_range_end)); | |
6bf5e0ba PA |
3569 | } |
3570 | ||
3571 | /* We're not reporting this breakpoint to GDB, so apply the | |
3572 | decr_pc_after_break adjustment to the inferior's regcache | |
3573 | ourselves. */ | |
3574 | ||
3575 | if (the_low_target.set_pc != NULL) | |
3576 | { | |
3577 | struct regcache *regcache | |
0bfdf32f | 3578 | = get_thread_regcache (current_thread, 1); |
6bf5e0ba PA |
3579 | (*the_low_target.set_pc) (regcache, event_child->stop_pc); |
3580 | } | |
3581 | ||
7984d532 | 3582 | if (step_over_finished) |
e3652c84 YQ |
3583 | { |
3584 | /* If we have finished stepping over a breakpoint, we've | |
3585 | stopped and suspended all LWPs momentarily except the | |
3586 | stepping one. This is where we resume them all again. | |
3587 | We're going to keep waiting, so use proceed, which | |
3588 | handles stepping over the next breakpoint. */ | |
3589 | unsuspend_all_lwps (event_child); | |
3590 | } | |
3591 | else | |
3592 | { | |
3593 | /* Remove the single-step breakpoints if any. Note that | |
3594 | there isn't single-step breakpoint if we finished stepping | |
3595 | over. */ | |
3596 | if (can_software_single_step () | |
3597 | && has_single_step_breakpoints (current_thread)) | |
3598 | { | |
3599 | stop_all_lwps (0, event_child); | |
3600 | delete_single_step_breakpoints (current_thread); | |
3601 | unstop_all_lwps (0, event_child); | |
3602 | } | |
3603 | } | |
7984d532 | 3604 | |
e3652c84 YQ |
3605 | if (debug_threads) |
3606 | debug_printf ("proceeding all threads.\n"); | |
6bf5e0ba | 3607 | proceed_all_lwps (); |
edeeb602 YQ |
3608 | |
3609 | if (debug_threads) | |
3610 | debug_exit (); | |
3611 | ||
582511be | 3612 | return ignore_event (ourstatus); |
6bf5e0ba PA |
3613 | } |
3614 | ||
3615 | if (debug_threads) | |
3616 | { | |
00db26fa | 3617 | if (event_child->waitstatus.kind != TARGET_WAITKIND_IGNORE) |
ad071a30 | 3618 | { |
23fdd69e SM |
3619 | std::string str |
3620 | = target_waitstatus_to_string (&event_child->waitstatus); | |
ad071a30 | 3621 | |
ad071a30 | 3622 | debug_printf ("LWP %ld: extended event with waitstatus %s\n", |
23fdd69e | 3623 | lwpid_of (get_lwp_thread (event_child)), str.c_str ()); |
ad071a30 | 3624 | } |
0bfdf32f | 3625 | if (current_thread->last_resume_kind == resume_step) |
c2d6af84 PA |
3626 | { |
3627 | if (event_child->step_range_start == event_child->step_range_end) | |
87ce2a04 | 3628 | debug_printf ("GDB wanted to single-step, reporting event.\n"); |
c2d6af84 | 3629 | else if (!lwp_in_step_range (event_child)) |
87ce2a04 | 3630 | debug_printf ("Out of step range, reporting event.\n"); |
c2d6af84 | 3631 | } |
15c66dd6 | 3632 | if (event_child->stop_reason == TARGET_STOPPED_BY_WATCHPOINT) |
87ce2a04 | 3633 | debug_printf ("Stopped by watchpoint.\n"); |
582511be | 3634 | else if (gdb_breakpoint_here (event_child->stop_pc)) |
87ce2a04 | 3635 | debug_printf ("Stopped by GDB breakpoint.\n"); |
6bf5e0ba | 3636 | if (debug_threads) |
87ce2a04 | 3637 | debug_printf ("Hit a non-gdbserver trap event.\n"); |
6bf5e0ba PA |
3638 | } |
3639 | ||
3640 | /* Alright, we're going to report a stop. */ | |
3641 | ||
3b9a79ef | 3642 | /* Remove single-step breakpoints. */ |
8901d193 YQ |
3643 | if (can_software_single_step ()) |
3644 | { | |
3b9a79ef | 3645 | /* Remove single-step breakpoints or not. It it is true, stop all |
8901d193 YQ |
3646 | lwps, so that other threads won't hit the breakpoint in the |
3647 | staled memory. */ | |
3b9a79ef | 3648 | int remove_single_step_breakpoints_p = 0; |
8901d193 YQ |
3649 | |
3650 | if (non_stop) | |
3651 | { | |
3b9a79ef YQ |
3652 | remove_single_step_breakpoints_p |
3653 | = has_single_step_breakpoints (current_thread); | |
8901d193 YQ |
3654 | } |
3655 | else | |
3656 | { | |
3657 | /* In all-stop, a stop reply cancels all previous resume | |
3b9a79ef | 3658 | requests. Delete all single-step breakpoints. */ |
8901d193 | 3659 | |
9c80ecd6 SM |
3660 | find_thread ([&] (thread_info *thread) { |
3661 | if (has_single_step_breakpoints (thread)) | |
3662 | { | |
3663 | remove_single_step_breakpoints_p = 1; | |
3664 | return true; | |
3665 | } | |
8901d193 | 3666 | |
9c80ecd6 SM |
3667 | return false; |
3668 | }); | |
8901d193 YQ |
3669 | } |
3670 | ||
3b9a79ef | 3671 | if (remove_single_step_breakpoints_p) |
8901d193 | 3672 | { |
3b9a79ef | 3673 | /* If we remove single-step breakpoints from memory, stop all lwps, |
8901d193 YQ |
3674 | so that other threads won't hit the breakpoint in the staled |
3675 | memory. */ | |
3676 | stop_all_lwps (0, event_child); | |
3677 | ||
3678 | if (non_stop) | |
3679 | { | |
3b9a79ef YQ |
3680 | gdb_assert (has_single_step_breakpoints (current_thread)); |
3681 | delete_single_step_breakpoints (current_thread); | |
8901d193 YQ |
3682 | } |
3683 | else | |
3684 | { | |
9c80ecd6 SM |
3685 | for_each_thread ([] (thread_info *thread){ |
3686 | if (has_single_step_breakpoints (thread)) | |
3687 | delete_single_step_breakpoints (thread); | |
3688 | }); | |
8901d193 YQ |
3689 | } |
3690 | ||
3691 | unstop_all_lwps (0, event_child); | |
3692 | } | |
3693 | } | |
3694 | ||
582511be | 3695 | if (!stabilizing_threads) |
6bf5e0ba PA |
3696 | { |
3697 | /* In all-stop, stop all threads. */ | |
582511be PA |
3698 | if (!non_stop) |
3699 | stop_all_lwps (0, NULL); | |
6bf5e0ba | 3700 | |
c03e6ccc | 3701 | if (step_over_finished) |
582511be PA |
3702 | { |
3703 | if (!non_stop) | |
3704 | { | |
3705 | /* If we were doing a step-over, all other threads but | |
3706 | the stepping one had been paused in start_step_over, | |
3707 | with their suspend counts incremented. We don't want | |
3708 | to do a full unstop/unpause, because we're in | |
3709 | all-stop mode (so we want threads stopped), but we | |
3710 | still need to unsuspend the other threads, to | |
3711 | decrement their `suspended' count back. */ | |
3712 | unsuspend_all_lwps (event_child); | |
3713 | } | |
3714 | else | |
3715 | { | |
3716 | /* If we just finished a step-over, then all threads had | |
3717 | been momentarily paused. In all-stop, that's fine, | |
3718 | we want threads stopped by now anyway. In non-stop, | |
3719 | we need to re-resume threads that GDB wanted to be | |
3720 | running. */ | |
3721 | unstop_all_lwps (1, event_child); | |
3722 | } | |
3723 | } | |
c03e6ccc | 3724 | |
3aa5cfa0 AT |
3725 | /* If we're not waiting for a specific LWP, choose an event LWP |
3726 | from among those that have had events. Giving equal priority | |
3727 | to all LWPs that have had events helps prevent | |
3728 | starvation. */ | |
d7e15655 | 3729 | if (ptid == minus_one_ptid) |
3aa5cfa0 AT |
3730 | { |
3731 | event_child->status_pending_p = 1; | |
3732 | event_child->status_pending = w; | |
3733 | ||
3734 | select_event_lwp (&event_child); | |
3735 | ||
3736 | /* current_thread and event_child must stay in sync. */ | |
3737 | current_thread = get_lwp_thread (event_child); | |
3738 | ||
3739 | event_child->status_pending_p = 0; | |
3740 | w = event_child->status_pending; | |
3741 | } | |
3742 | ||
3743 | ||
fa593d66 | 3744 | /* Stabilize threads (move out of jump pads). */ |
582511be PA |
3745 | if (!non_stop) |
3746 | stabilize_threads (); | |
6bf5e0ba PA |
3747 | } |
3748 | else | |
3749 | { | |
3750 | /* If we just finished a step-over, then all threads had been | |
3751 | momentarily paused. In all-stop, that's fine, we want | |
3752 | threads stopped by now anyway. In non-stop, we need to | |
3753 | re-resume threads that GDB wanted to be running. */ | |
3754 | if (step_over_finished) | |
7984d532 | 3755 | unstop_all_lwps (1, event_child); |
6bf5e0ba PA |
3756 | } |
3757 | ||
00db26fa | 3758 | if (event_child->waitstatus.kind != TARGET_WAITKIND_IGNORE) |
de0d863e | 3759 | { |
00db26fa PA |
3760 | /* If the reported event is an exit, fork, vfork or exec, let |
3761 | GDB know. */ | |
5a04c4cf PA |
3762 | |
3763 | /* Break the unreported fork relationship chain. */ | |
3764 | if (event_child->waitstatus.kind == TARGET_WAITKIND_FORKED | |
3765 | || event_child->waitstatus.kind == TARGET_WAITKIND_VFORKED) | |
3766 | { | |
3767 | event_child->fork_relative->fork_relative = NULL; | |
3768 | event_child->fork_relative = NULL; | |
3769 | } | |
3770 | ||
00db26fa | 3771 | *ourstatus = event_child->waitstatus; |
de0d863e DB |
3772 | /* Clear the event lwp's waitstatus since we handled it already. */ |
3773 | event_child->waitstatus.kind = TARGET_WAITKIND_IGNORE; | |
3774 | } | |
3775 | else | |
3776 | ourstatus->kind = TARGET_WAITKIND_STOPPED; | |
5b1c542e | 3777 | |
582511be | 3778 | /* Now that we've selected our final event LWP, un-adjust its PC if |
3e572f71 PA |
3779 | it was a software breakpoint, and the client doesn't know we can |
3780 | adjust the breakpoint ourselves. */ | |
3781 | if (event_child->stop_reason == TARGET_STOPPED_BY_SW_BREAKPOINT | |
c12a5089 | 3782 | && !cs.swbreak_feature) |
582511be PA |
3783 | { |
3784 | int decr_pc = the_low_target.decr_pc_after_break; | |
3785 | ||
3786 | if (decr_pc != 0) | |
3787 | { | |
3788 | struct regcache *regcache | |
3789 | = get_thread_regcache (current_thread, 1); | |
3790 | (*the_low_target.set_pc) (regcache, event_child->stop_pc + decr_pc); | |
3791 | } | |
3792 | } | |
3793 | ||
82075af2 JS |
3794 | if (WSTOPSIG (w) == SYSCALL_SIGTRAP) |
3795 | { | |
82075af2 | 3796 | get_syscall_trapinfo (event_child, |
4cc32bec | 3797 | &ourstatus->value.syscall_number); |
82075af2 JS |
3798 | ourstatus->kind = event_child->syscall_state; |
3799 | } | |
3800 | else if (current_thread->last_resume_kind == resume_stop | |
3801 | && WSTOPSIG (w) == SIGSTOP) | |
bd99dc85 PA |
3802 | { |
3803 | /* A thread that has been requested to stop by GDB with vCont;t, | |
3804 | and it stopped cleanly, so report as SIG0. The use of | |
3805 | SIGSTOP is an implementation detail. */ | |
a493e3e2 | 3806 | ourstatus->value.sig = GDB_SIGNAL_0; |
bd99dc85 | 3807 | } |
0bfdf32f | 3808 | else if (current_thread->last_resume_kind == resume_stop |
8336d594 | 3809 | && WSTOPSIG (w) != SIGSTOP) |
bd99dc85 PA |
3810 | { |
3811 | /* A thread that has been requested to stop by GDB with vCont;t, | |
d50171e4 | 3812 | but, it stopped for other reasons. */ |
2ea28649 | 3813 | ourstatus->value.sig = gdb_signal_from_host (WSTOPSIG (w)); |
bd99dc85 | 3814 | } |
de0d863e | 3815 | else if (ourstatus->kind == TARGET_WAITKIND_STOPPED) |
bd99dc85 | 3816 | { |
2ea28649 | 3817 | ourstatus->value.sig = gdb_signal_from_host (WSTOPSIG (w)); |
bd99dc85 PA |
3818 | } |
3819 | ||
d7e15655 | 3820 | gdb_assert (step_over_bkpt == null_ptid); |
d50171e4 | 3821 | |
bd99dc85 | 3822 | if (debug_threads) |
87ce2a04 DE |
3823 | { |
3824 | debug_printf ("linux_wait_1 ret = %s, %d, %d\n", | |
0bfdf32f | 3825 | target_pid_to_str (ptid_of (current_thread)), |
87ce2a04 DE |
3826 | ourstatus->kind, ourstatus->value.sig); |
3827 | debug_exit (); | |
3828 | } | |
bd99dc85 | 3829 | |
65706a29 PA |
3830 | if (ourstatus->kind == TARGET_WAITKIND_EXITED) |
3831 | return filter_exit_event (event_child, ourstatus); | |
3832 | ||
0bfdf32f | 3833 | return ptid_of (current_thread); |
bd99dc85 PA |
3834 | } |
3835 | ||
3836 | /* Get rid of any pending event in the pipe. */ | |
3837 | static void | |
3838 | async_file_flush (void) | |
3839 | { | |
3840 | int ret; | |
3841 | char buf; | |
3842 | ||
3843 | do | |
3844 | ret = read (linux_event_pipe[0], &buf, 1); | |
3845 | while (ret >= 0 || (ret == -1 && errno == EINTR)); | |
3846 | } | |
3847 | ||
3848 | /* Put something in the pipe, so the event loop wakes up. */ | |
3849 | static void | |
3850 | async_file_mark (void) | |
3851 | { | |
3852 | int ret; | |
3853 | ||
3854 | async_file_flush (); | |
3855 | ||
3856 | do | |
3857 | ret = write (linux_event_pipe[1], "+", 1); | |
3858 | while (ret == 0 || (ret == -1 && errno == EINTR)); | |
3859 | ||
3860 | /* Ignore EAGAIN. If the pipe is full, the event loop will already | |
3861 | be awakened anyway. */ | |
3862 | } | |
3863 | ||
95954743 PA |
3864 | static ptid_t |
3865 | linux_wait (ptid_t ptid, | |
3866 | struct target_waitstatus *ourstatus, int target_options) | |
bd99dc85 | 3867 | { |
95954743 | 3868 | ptid_t event_ptid; |
bd99dc85 | 3869 | |
bd99dc85 PA |
3870 | /* Flush the async file first. */ |
3871 | if (target_is_async_p ()) | |
3872 | async_file_flush (); | |
3873 | ||
582511be PA |
3874 | do |
3875 | { | |
3876 | event_ptid = linux_wait_1 (ptid, ourstatus, target_options); | |
3877 | } | |
3878 | while ((target_options & TARGET_WNOHANG) == 0 | |
d7e15655 | 3879 | && event_ptid == null_ptid |
582511be | 3880 | && ourstatus->kind == TARGET_WAITKIND_IGNORE); |
bd99dc85 PA |
3881 | |
3882 | /* If at least one stop was reported, there may be more. A single | |
3883 | SIGCHLD can signal more than one child stop. */ | |
3884 | if (target_is_async_p () | |
3885 | && (target_options & TARGET_WNOHANG) != 0 | |
d7e15655 | 3886 | && event_ptid != null_ptid) |
bd99dc85 PA |
3887 | async_file_mark (); |
3888 | ||
3889 | return event_ptid; | |
da6d8c04 DJ |
3890 | } |
3891 | ||
c5f62d5f | 3892 | /* Send a signal to an LWP. */ |
fd500816 DJ |
3893 | |
3894 | static int | |
a1928bad | 3895 | kill_lwp (unsigned long lwpid, int signo) |
fd500816 | 3896 | { |
4a6ed09b | 3897 | int ret; |
fd500816 | 3898 | |
4a6ed09b PA |
3899 | errno = 0; |
3900 | ret = syscall (__NR_tkill, lwpid, signo); | |
3901 | if (errno == ENOSYS) | |
3902 | { | |
3903 | /* If tkill fails, then we are not using nptl threads, a | |
3904 | configuration we no longer support. */ | |
3905 | perror_with_name (("tkill")); | |
3906 | } | |
3907 | return ret; | |
fd500816 DJ |
3908 | } |
3909 | ||
964e4306 PA |
3910 | void |
3911 | linux_stop_lwp (struct lwp_info *lwp) | |
3912 | { | |
3913 | send_sigstop (lwp); | |
3914 | } | |
3915 | ||
0d62e5e8 | 3916 | static void |
02fc4de7 | 3917 | send_sigstop (struct lwp_info *lwp) |
0d62e5e8 | 3918 | { |
bd99dc85 | 3919 | int pid; |
0d62e5e8 | 3920 | |
d86d4aaf | 3921 | pid = lwpid_of (get_lwp_thread (lwp)); |
bd99dc85 | 3922 | |
0d62e5e8 DJ |
3923 | /* If we already have a pending stop signal for this process, don't |
3924 | send another. */ | |
54a0b537 | 3925 | if (lwp->stop_expected) |
0d62e5e8 | 3926 | { |
ae13219e | 3927 | if (debug_threads) |
87ce2a04 | 3928 | debug_printf ("Have pending sigstop for lwp %d\n", pid); |
ae13219e | 3929 | |
0d62e5e8 DJ |
3930 | return; |
3931 | } | |
3932 | ||
3933 | if (debug_threads) | |
87ce2a04 | 3934 | debug_printf ("Sending sigstop to lwp %d\n", pid); |
0d62e5e8 | 3935 | |
d50171e4 | 3936 | lwp->stop_expected = 1; |
bd99dc85 | 3937 | kill_lwp (pid, SIGSTOP); |
0d62e5e8 DJ |
3938 | } |
3939 | ||
df3e4dbe SM |
3940 | static void |
3941 | send_sigstop (thread_info *thread, lwp_info *except) | |
02fc4de7 | 3942 | { |
d86d4aaf | 3943 | struct lwp_info *lwp = get_thread_lwp (thread); |
02fc4de7 | 3944 | |
7984d532 PA |
3945 | /* Ignore EXCEPT. */ |
3946 | if (lwp == except) | |
df3e4dbe | 3947 | return; |
7984d532 | 3948 | |
02fc4de7 | 3949 | if (lwp->stopped) |
df3e4dbe | 3950 | return; |
02fc4de7 PA |
3951 | |
3952 | send_sigstop (lwp); | |
7984d532 PA |
3953 | } |
3954 | ||
3955 | /* Increment the suspend count of an LWP, and stop it, if not stopped | |
3956 | yet. */ | |
df3e4dbe SM |
3957 | static void |
3958 | suspend_and_send_sigstop (thread_info *thread, lwp_info *except) | |
7984d532 | 3959 | { |
d86d4aaf | 3960 | struct lwp_info *lwp = get_thread_lwp (thread); |
7984d532 PA |
3961 | |
3962 | /* Ignore EXCEPT. */ | |
3963 | if (lwp == except) | |
df3e4dbe | 3964 | return; |
7984d532 | 3965 | |
863d01bd | 3966 | lwp_suspended_inc (lwp); |
7984d532 | 3967 | |
df3e4dbe | 3968 | send_sigstop (thread, except); |
02fc4de7 PA |
3969 | } |
3970 | ||
95954743 PA |
3971 | static void |
3972 | mark_lwp_dead (struct lwp_info *lwp, int wstat) | |
3973 | { | |
95954743 PA |
3974 | /* Store the exit status for later. */ |
3975 | lwp->status_pending_p = 1; | |
3976 | lwp->status_pending = wstat; | |
3977 | ||
00db26fa PA |
3978 | /* Store in waitstatus as well, as there's nothing else to process |
3979 | for this event. */ | |
3980 | if (WIFEXITED (wstat)) | |
3981 | { | |
3982 | lwp->waitstatus.kind = TARGET_WAITKIND_EXITED; | |
3983 | lwp->waitstatus.value.integer = WEXITSTATUS (wstat); | |
3984 | } | |
3985 | else if (WIFSIGNALED (wstat)) | |
3986 | { | |
3987 | lwp->waitstatus.kind = TARGET_WAITKIND_SIGNALLED; | |
3988 | lwp->waitstatus.value.sig = gdb_signal_from_host (WTERMSIG (wstat)); | |
3989 | } | |
3990 | ||
95954743 PA |
3991 | /* Prevent trying to stop it. */ |
3992 | lwp->stopped = 1; | |
3993 | ||
3994 | /* No further stops are expected from a dead lwp. */ | |
3995 | lwp->stop_expected = 0; | |
3996 | } | |
3997 | ||
00db26fa PA |
3998 | /* Return true if LWP has exited already, and has a pending exit event |
3999 | to report to GDB. */ | |
4000 | ||
4001 | static int | |
4002 | lwp_is_marked_dead (struct lwp_info *lwp) | |
4003 | { | |
4004 | return (lwp->status_pending_p | |
4005 | && (WIFEXITED (lwp->status_pending) | |
4006 | || WIFSIGNALED (lwp->status_pending))); | |
4007 | } | |
4008 | ||
fa96cb38 PA |
4009 | /* Wait for all children to stop for the SIGSTOPs we just queued. */ |
4010 | ||
0d62e5e8 | 4011 | static void |
fa96cb38 | 4012 | wait_for_sigstop (void) |
0d62e5e8 | 4013 | { |
0bfdf32f | 4014 | struct thread_info *saved_thread; |
95954743 | 4015 | ptid_t saved_tid; |
fa96cb38 PA |
4016 | int wstat; |
4017 | int ret; | |
0d62e5e8 | 4018 | |
0bfdf32f GB |
4019 | saved_thread = current_thread; |
4020 | if (saved_thread != NULL) | |
9c80ecd6 | 4021 | saved_tid = saved_thread->id; |
bd99dc85 | 4022 | else |
95954743 | 4023 | saved_tid = null_ptid; /* avoid bogus unused warning */ |
bd99dc85 | 4024 | |
d50171e4 | 4025 | if (debug_threads) |
fa96cb38 | 4026 | debug_printf ("wait_for_sigstop: pulling events\n"); |
d50171e4 | 4027 | |
fa96cb38 PA |
4028 | /* Passing NULL_PTID as filter indicates we want all events to be |
4029 | left pending. Eventually this returns when there are no | |
4030 | unwaited-for children left. */ | |
4031 | ret = linux_wait_for_event_filtered (minus_one_ptid, null_ptid, | |
4032 | &wstat, __WALL); | |
4033 | gdb_assert (ret == -1); | |
0d62e5e8 | 4034 | |
0bfdf32f GB |
4035 | if (saved_thread == NULL || linux_thread_alive (saved_tid)) |
4036 | current_thread = saved_thread; | |
0d62e5e8 DJ |
4037 | else |
4038 | { | |
4039 | if (debug_threads) | |
87ce2a04 | 4040 | debug_printf ("Previously current thread died.\n"); |
0d62e5e8 | 4041 | |
f0db101d PA |
4042 | /* We can't change the current inferior behind GDB's back, |
4043 | otherwise, a subsequent command may apply to the wrong | |
4044 | process. */ | |
4045 | current_thread = NULL; | |
0d62e5e8 DJ |
4046 | } |
4047 | } | |
4048 | ||
fcb056a5 | 4049 | /* Returns true if THREAD is stopped in a jump pad, and we can't |
fa593d66 PA |
4050 | move it out, because we need to report the stop event to GDB. For |
4051 | example, if the user puts a breakpoint in the jump pad, it's | |
4052 | because she wants to debug it. */ | |
4053 | ||
fcb056a5 SM |
4054 | static bool |
4055 | stuck_in_jump_pad_callback (thread_info *thread) | |
fa593d66 | 4056 | { |
d86d4aaf | 4057 | struct lwp_info *lwp = get_thread_lwp (thread); |
fa593d66 | 4058 | |
863d01bd PA |
4059 | if (lwp->suspended != 0) |
4060 | { | |
4061 | internal_error (__FILE__, __LINE__, | |
4062 | "LWP %ld is suspended, suspended=%d\n", | |
4063 | lwpid_of (thread), lwp->suspended); | |
4064 | } | |
fa593d66 PA |
4065 | gdb_assert (lwp->stopped); |
4066 | ||
4067 | /* Allow debugging the jump pad, gdb_collect, etc.. */ | |
4068 | return (supports_fast_tracepoints () | |
58b4daa5 | 4069 | && agent_loaded_p () |
fa593d66 | 4070 | && (gdb_breakpoint_here (lwp->stop_pc) |
15c66dd6 | 4071 | || lwp->stop_reason == TARGET_STOPPED_BY_WATCHPOINT |
fa593d66 | 4072 | || thread->last_resume_kind == resume_step) |
229d26fc SM |
4073 | && (linux_fast_tracepoint_collecting (lwp, NULL) |
4074 | != fast_tpoint_collect_result::not_collecting)); | |
fa593d66 PA |
4075 | } |
4076 | ||
4077 | static void | |
9c80ecd6 | 4078 | move_out_of_jump_pad_callback (thread_info *thread) |
fa593d66 | 4079 | { |
f0ce0d3a | 4080 | struct thread_info *saved_thread; |
d86d4aaf | 4081 | struct lwp_info *lwp = get_thread_lwp (thread); |
fa593d66 PA |
4082 | int *wstat; |
4083 | ||
863d01bd PA |
4084 | if (lwp->suspended != 0) |
4085 | { | |
4086 | internal_error (__FILE__, __LINE__, | |
4087 | "LWP %ld is suspended, suspended=%d\n", | |
4088 | lwpid_of (thread), lwp->suspended); | |
4089 | } | |
fa593d66 PA |
4090 | gdb_assert (lwp->stopped); |
4091 | ||
f0ce0d3a PA |
4092 | /* For gdb_breakpoint_here. */ |
4093 | saved_thread = current_thread; | |
4094 | current_thread = thread; | |
4095 | ||
fa593d66 PA |
4096 | wstat = lwp->status_pending_p ? &lwp->status_pending : NULL; |
4097 | ||
4098 | /* Allow debugging the jump pad, gdb_collect, etc. */ | |
4099 | if (!gdb_breakpoint_here (lwp->stop_pc) | |
15c66dd6 | 4100 | && lwp->stop_reason != TARGET_STOPPED_BY_WATCHPOINT |
fa593d66 PA |
4101 | && thread->last_resume_kind != resume_step |
4102 | && maybe_move_out_of_jump_pad (lwp, wstat)) | |
4103 | { | |
4104 | if (debug_threads) | |
87ce2a04 | 4105 | debug_printf ("LWP %ld needs stabilizing (in jump pad)\n", |
d86d4aaf | 4106 | lwpid_of (thread)); |
fa593d66 PA |
4107 | |
4108 | if (wstat) | |
4109 | { | |
4110 | lwp->status_pending_p = 0; | |
4111 | enqueue_one_deferred_signal (lwp, wstat); | |
4112 | ||
4113 | if (debug_threads) | |
87ce2a04 DE |
4114 | debug_printf ("Signal %d for LWP %ld deferred " |
4115 | "(in jump pad)\n", | |
d86d4aaf | 4116 | WSTOPSIG (*wstat), lwpid_of (thread)); |
fa593d66 PA |
4117 | } |
4118 | ||
4119 | linux_resume_one_lwp (lwp, 0, 0, NULL); | |
4120 | } | |
4121 | else | |
863d01bd | 4122 | lwp_suspended_inc (lwp); |
f0ce0d3a PA |
4123 | |
4124 | current_thread = saved_thread; | |
fa593d66 PA |
4125 | } |
4126 | ||
5a6b0a41 SM |
4127 | static bool |
4128 | lwp_running (thread_info *thread) | |
fa593d66 | 4129 | { |
d86d4aaf | 4130 | struct lwp_info *lwp = get_thread_lwp (thread); |
fa593d66 | 4131 | |
00db26fa | 4132 | if (lwp_is_marked_dead (lwp)) |
5a6b0a41 SM |
4133 | return false; |
4134 | ||
4135 | return !lwp->stopped; | |
fa593d66 PA |
4136 | } |
4137 | ||
7984d532 PA |
4138 | /* Stop all lwps that aren't stopped yet, except EXCEPT, if not NULL. |
4139 | If SUSPEND, then also increase the suspend count of every LWP, | |
4140 | except EXCEPT. */ | |
4141 | ||
0d62e5e8 | 4142 | static void |
7984d532 | 4143 | stop_all_lwps (int suspend, struct lwp_info *except) |
0d62e5e8 | 4144 | { |
bde24c0a PA |
4145 | /* Should not be called recursively. */ |
4146 | gdb_assert (stopping_threads == NOT_STOPPING_THREADS); | |
4147 | ||
87ce2a04 DE |
4148 | if (debug_threads) |
4149 | { | |
4150 | debug_enter (); | |
4151 | debug_printf ("stop_all_lwps (%s, except=%s)\n", | |
4152 | suspend ? "stop-and-suspend" : "stop", | |
4153 | except != NULL | |
d86d4aaf | 4154 | ? target_pid_to_str (ptid_of (get_lwp_thread (except))) |
87ce2a04 DE |
4155 | : "none"); |
4156 | } | |
4157 | ||
bde24c0a PA |
4158 | stopping_threads = (suspend |
4159 | ? STOPPING_AND_SUSPENDING_THREADS | |
4160 | : STOPPING_THREADS); | |
7984d532 PA |
4161 | |
4162 | if (suspend) | |
df3e4dbe SM |
4163 | for_each_thread ([&] (thread_info *thread) |
4164 | { | |
4165 | suspend_and_send_sigstop (thread, except); | |
4166 | }); | |
7984d532 | 4167 | else |
df3e4dbe SM |
4168 | for_each_thread ([&] (thread_info *thread) |
4169 | { | |
4170 | send_sigstop (thread, except); | |
4171 | }); | |
4172 | ||
fa96cb38 | 4173 | wait_for_sigstop (); |
bde24c0a | 4174 | stopping_threads = NOT_STOPPING_THREADS; |
87ce2a04 DE |
4175 | |
4176 | if (debug_threads) | |
4177 | { | |
4178 | debug_printf ("stop_all_lwps done, setting stopping_threads " | |
4179 | "back to !stopping\n"); | |
4180 | debug_exit (); | |
4181 | } | |
0d62e5e8 DJ |
4182 | } |
4183 | ||
863d01bd PA |
4184 | /* Enqueue one signal in the chain of signals which need to be |
4185 | delivered to this process on next resume. */ | |
4186 | ||
4187 | static void | |
4188 | enqueue_pending_signal (struct lwp_info *lwp, int signal, siginfo_t *info) | |
4189 | { | |
8d749320 | 4190 | struct pending_signals *p_sig = XNEW (struct pending_signals); |
863d01bd | 4191 | |
863d01bd PA |
4192 | p_sig->prev = lwp->pending_signals; |
4193 | p_sig->signal = signal; | |
4194 | if (info == NULL) | |
4195 | memset (&p_sig->info, 0, sizeof (siginfo_t)); | |
4196 | else | |
4197 | memcpy (&p_sig->info, info, sizeof (siginfo_t)); | |
4198 | lwp->pending_signals = p_sig; | |
4199 | } | |
4200 | ||
fa5308bd AT |
4201 | /* Install breakpoints for software single stepping. */ |
4202 | ||
4203 | static void | |
4204 | install_software_single_step_breakpoints (struct lwp_info *lwp) | |
4205 | { | |
984a2c04 YQ |
4206 | struct thread_info *thread = get_lwp_thread (lwp); |
4207 | struct regcache *regcache = get_thread_regcache (thread, 1); | |
8ce47547 TT |
4208 | |
4209 | scoped_restore save_current_thread = make_scoped_restore (¤t_thread); | |
984a2c04 | 4210 | |
984a2c04 | 4211 | current_thread = thread; |
a0ff9e1a | 4212 | std::vector<CORE_ADDR> next_pcs = the_low_target.get_next_pcs (regcache); |
fa5308bd | 4213 | |
a0ff9e1a | 4214 | for (CORE_ADDR pc : next_pcs) |
3b9a79ef | 4215 | set_single_step_breakpoint (pc, current_ptid); |
fa5308bd AT |
4216 | } |
4217 | ||
7fe5e27e AT |
4218 | /* Single step via hardware or software single step. |
4219 | Return 1 if hardware single stepping, 0 if software single stepping | |
4220 | or can't single step. */ | |
4221 | ||
4222 | static int | |
4223 | single_step (struct lwp_info* lwp) | |
4224 | { | |
4225 | int step = 0; | |
4226 | ||
4227 | if (can_hardware_single_step ()) | |
4228 | { | |
4229 | step = 1; | |
4230 | } | |
4231 | else if (can_software_single_step ()) | |
4232 | { | |
4233 | install_software_single_step_breakpoints (lwp); | |
4234 | step = 0; | |
4235 | } | |
4236 | else | |
4237 | { | |
4238 | if (debug_threads) | |
4239 | debug_printf ("stepping is not implemented on this target"); | |
4240 | } | |
4241 | ||
4242 | return step; | |
4243 | } | |
4244 | ||
35ac8b3e | 4245 | /* The signal can be delivered to the inferior if we are not trying to |
5b061e98 YQ |
4246 | finish a fast tracepoint collect. Since signal can be delivered in |
4247 | the step-over, the program may go to signal handler and trap again | |
4248 | after return from the signal handler. We can live with the spurious | |
4249 | double traps. */ | |
35ac8b3e YQ |
4250 | |
4251 | static int | |
4252 | lwp_signal_can_be_delivered (struct lwp_info *lwp) | |
4253 | { | |
229d26fc SM |
4254 | return (lwp->collecting_fast_tracepoint |
4255 | == fast_tpoint_collect_result::not_collecting); | |
35ac8b3e YQ |
4256 | } |
4257 | ||
23f238d3 PA |
4258 | /* Resume execution of LWP. If STEP is nonzero, single-step it. If |
4259 | SIGNAL is nonzero, give it that signal. */ | |
da6d8c04 | 4260 | |
ce3a066d | 4261 | static void |
23f238d3 PA |
4262 | linux_resume_one_lwp_throw (struct lwp_info *lwp, |
4263 | int step, int signal, siginfo_t *info) | |
da6d8c04 | 4264 | { |
d86d4aaf | 4265 | struct thread_info *thread = get_lwp_thread (lwp); |
0bfdf32f | 4266 | struct thread_info *saved_thread; |
82075af2 | 4267 | int ptrace_request; |
c06cbd92 YQ |
4268 | struct process_info *proc = get_thread_process (thread); |
4269 | ||
4270 | /* Note that target description may not be initialised | |
4271 | (proc->tdesc == NULL) at this point because the program hasn't | |
4272 | stopped at the first instruction yet. It means GDBserver skips | |
4273 | the extra traps from the wrapper program (see option --wrapper). | |
4274 | Code in this function that requires register access should be | |
4275 | guarded by proc->tdesc == NULL or something else. */ | |
0d62e5e8 | 4276 | |
54a0b537 | 4277 | if (lwp->stopped == 0) |
0d62e5e8 DJ |
4278 | return; |
4279 | ||
65706a29 PA |
4280 | gdb_assert (lwp->waitstatus.kind == TARGET_WAITKIND_IGNORE); |
4281 | ||
229d26fc SM |
4282 | fast_tpoint_collect_result fast_tp_collecting |
4283 | = lwp->collecting_fast_tracepoint; | |
fa593d66 | 4284 | |
229d26fc SM |
4285 | gdb_assert (!stabilizing_threads |
4286 | || (fast_tp_collecting | |
4287 | != fast_tpoint_collect_result::not_collecting)); | |
fa593d66 | 4288 | |
219f2f23 PA |
4289 | /* Cancel actions that rely on GDB not changing the PC (e.g., the |
4290 | user used the "jump" command, or "set $pc = foo"). */ | |
c06cbd92 | 4291 | if (thread->while_stepping != NULL && lwp->stop_pc != get_pc (lwp)) |
219f2f23 PA |
4292 | { |
4293 | /* Collecting 'while-stepping' actions doesn't make sense | |
4294 | anymore. */ | |
d86d4aaf | 4295 | release_while_stepping_state_list (thread); |
219f2f23 PA |
4296 | } |
4297 | ||
0d62e5e8 | 4298 | /* If we have pending signals or status, and a new signal, enqueue the |
35ac8b3e YQ |
4299 | signal. Also enqueue the signal if it can't be delivered to the |
4300 | inferior right now. */ | |
0d62e5e8 | 4301 | if (signal != 0 |
fa593d66 PA |
4302 | && (lwp->status_pending_p |
4303 | || lwp->pending_signals != NULL | |
35ac8b3e | 4304 | || !lwp_signal_can_be_delivered (lwp))) |
94610ec4 YQ |
4305 | { |
4306 | enqueue_pending_signal (lwp, signal, info); | |
4307 | ||
4308 | /* Postpone any pending signal. It was enqueued above. */ | |
4309 | signal = 0; | |
4310 | } | |
0d62e5e8 | 4311 | |
d50171e4 PA |
4312 | if (lwp->status_pending_p) |
4313 | { | |
4314 | if (debug_threads) | |
94610ec4 | 4315 | debug_printf ("Not resuming lwp %ld (%s, stop %s);" |
87ce2a04 | 4316 | " has pending status\n", |
94610ec4 | 4317 | lwpid_of (thread), step ? "step" : "continue", |
87ce2a04 | 4318 | lwp->stop_expected ? "expected" : "not expected"); |
d50171e4 PA |
4319 | return; |
4320 | } | |
0d62e5e8 | 4321 | |
0bfdf32f GB |
4322 | saved_thread = current_thread; |
4323 | current_thread = thread; | |
0d62e5e8 | 4324 | |
0d62e5e8 DJ |
4325 | /* This bit needs some thinking about. If we get a signal that |
4326 | we must report while a single-step reinsert is still pending, | |
4327 | we often end up resuming the thread. It might be better to | |
4328 | (ew) allow a stack of pending events; then we could be sure that | |
4329 | the reinsert happened right away and not lose any signals. | |
4330 | ||
4331 | Making this stack would also shrink the window in which breakpoints are | |
54a0b537 | 4332 | uninserted (see comment in linux_wait_for_lwp) but not enough for |
0d62e5e8 DJ |
4333 | complete correctness, so it won't solve that problem. It may be |
4334 | worthwhile just to solve this one, however. */ | |
54a0b537 | 4335 | if (lwp->bp_reinsert != 0) |
0d62e5e8 DJ |
4336 | { |
4337 | if (debug_threads) | |
87ce2a04 DE |
4338 | debug_printf (" pending reinsert at 0x%s\n", |
4339 | paddress (lwp->bp_reinsert)); | |
d50171e4 | 4340 | |
85e00e85 | 4341 | if (can_hardware_single_step ()) |
d50171e4 | 4342 | { |
229d26fc | 4343 | if (fast_tp_collecting == fast_tpoint_collect_result::not_collecting) |
fa593d66 PA |
4344 | { |
4345 | if (step == 0) | |
9986ba08 | 4346 | warning ("BAD - reinserting but not stepping."); |
fa593d66 | 4347 | if (lwp->suspended) |
9986ba08 PA |
4348 | warning ("BAD - reinserting and suspended(%d).", |
4349 | lwp->suspended); | |
fa593d66 | 4350 | } |
d50171e4 | 4351 | } |
f79b145d YQ |
4352 | |
4353 | step = maybe_hw_step (thread); | |
0d62e5e8 DJ |
4354 | } |
4355 | ||
229d26fc | 4356 | if (fast_tp_collecting == fast_tpoint_collect_result::before_insn) |
fa593d66 PA |
4357 | { |
4358 | if (debug_threads) | |
87ce2a04 DE |
4359 | debug_printf ("lwp %ld wants to get out of fast tracepoint jump pad" |
4360 | " (exit-jump-pad-bkpt)\n", | |
d86d4aaf | 4361 | lwpid_of (thread)); |
fa593d66 | 4362 | } |
229d26fc | 4363 | else if (fast_tp_collecting == fast_tpoint_collect_result::at_insn) |
fa593d66 PA |
4364 | { |
4365 | if (debug_threads) | |
87ce2a04 DE |
4366 | debug_printf ("lwp %ld wants to get out of fast tracepoint jump pad" |
4367 | " single-stepping\n", | |
d86d4aaf | 4368 | lwpid_of (thread)); |
fa593d66 PA |
4369 | |
4370 | if (can_hardware_single_step ()) | |
4371 | step = 1; | |
4372 | else | |
38e08fca GB |
4373 | { |
4374 | internal_error (__FILE__, __LINE__, | |
4375 | "moving out of jump pad single-stepping" | |
4376 | " not implemented on this target"); | |
4377 | } | |
fa593d66 PA |
4378 | } |
4379 | ||
219f2f23 PA |
4380 | /* If we have while-stepping actions in this thread set it stepping. |
4381 | If we have a signal to deliver, it may or may not be set to | |
4382 | SIG_IGN, we don't know. Assume so, and allow collecting | |
4383 | while-stepping into a signal handler. A possible smart thing to | |
4384 | do would be to set an internal breakpoint at the signal return | |
4385 | address, continue, and carry on catching this while-stepping | |
4386 | action only when that breakpoint is hit. A future | |
4387 | enhancement. */ | |
7fe5e27e | 4388 | if (thread->while_stepping != NULL) |
219f2f23 PA |
4389 | { |
4390 | if (debug_threads) | |
87ce2a04 | 4391 | debug_printf ("lwp %ld has a while-stepping action -> forcing step.\n", |
d86d4aaf | 4392 | lwpid_of (thread)); |
7fe5e27e AT |
4393 | |
4394 | step = single_step (lwp); | |
219f2f23 PA |
4395 | } |
4396 | ||
c06cbd92 | 4397 | if (proc->tdesc != NULL && the_low_target.get_pc != NULL) |
0d62e5e8 | 4398 | { |
0bfdf32f | 4399 | struct regcache *regcache = get_thread_regcache (current_thread, 1); |
582511be PA |
4400 | |
4401 | lwp->stop_pc = (*the_low_target.get_pc) (regcache); | |
4402 | ||
4403 | if (debug_threads) | |
4404 | { | |
4405 | debug_printf (" %s from pc 0x%lx\n", step ? "step" : "continue", | |
4406 | (long) lwp->stop_pc); | |
4407 | } | |
0d62e5e8 DJ |
4408 | } |
4409 | ||
35ac8b3e YQ |
4410 | /* If we have pending signals, consume one if it can be delivered to |
4411 | the inferior. */ | |
4412 | if (lwp->pending_signals != NULL && lwp_signal_can_be_delivered (lwp)) | |
0d62e5e8 DJ |
4413 | { |
4414 | struct pending_signals **p_sig; | |
4415 | ||
54a0b537 | 4416 | p_sig = &lwp->pending_signals; |
0d62e5e8 DJ |
4417 | while ((*p_sig)->prev != NULL) |
4418 | p_sig = &(*p_sig)->prev; | |
4419 | ||
4420 | signal = (*p_sig)->signal; | |
32ca6d61 | 4421 | if ((*p_sig)->info.si_signo != 0) |
d86d4aaf | 4422 | ptrace (PTRACE_SETSIGINFO, lwpid_of (thread), (PTRACE_TYPE_ARG3) 0, |
56f7af9c | 4423 | &(*p_sig)->info); |
32ca6d61 | 4424 | |
0d62e5e8 DJ |
4425 | free (*p_sig); |
4426 | *p_sig = NULL; | |
4427 | } | |
4428 | ||
94610ec4 YQ |
4429 | if (debug_threads) |
4430 | debug_printf ("Resuming lwp %ld (%s, signal %d, stop %s)\n", | |
4431 | lwpid_of (thread), step ? "step" : "continue", signal, | |
4432 | lwp->stop_expected ? "expected" : "not expected"); | |
4433 | ||
aa5ca48f DE |
4434 | if (the_low_target.prepare_to_resume != NULL) |
4435 | the_low_target.prepare_to_resume (lwp); | |
4436 | ||
d86d4aaf | 4437 | regcache_invalidate_thread (thread); |
da6d8c04 | 4438 | errno = 0; |
54a0b537 | 4439 | lwp->stepping = step; |
82075af2 JS |
4440 | if (step) |
4441 | ptrace_request = PTRACE_SINGLESTEP; | |
4442 | else if (gdb_catching_syscalls_p (lwp)) | |
4443 | ptrace_request = PTRACE_SYSCALL; | |
4444 | else | |
4445 | ptrace_request = PTRACE_CONT; | |
4446 | ptrace (ptrace_request, | |
4447 | lwpid_of (thread), | |
b8e1b30e | 4448 | (PTRACE_TYPE_ARG3) 0, |
14ce3065 DE |
4449 | /* Coerce to a uintptr_t first to avoid potential gcc warning |
4450 | of coercing an 8 byte integer to a 4 byte pointer. */ | |
b8e1b30e | 4451 | (PTRACE_TYPE_ARG4) (uintptr_t) signal); |
0d62e5e8 | 4452 | |
0bfdf32f | 4453 | current_thread = saved_thread; |
da6d8c04 | 4454 | if (errno) |
23f238d3 PA |
4455 | perror_with_name ("resuming thread"); |
4456 | ||
4457 | /* Successfully resumed. Clear state that no longer makes sense, | |
4458 | and mark the LWP as running. Must not do this before resuming | |
4459 | otherwise if that fails other code will be confused. E.g., we'd | |
4460 | later try to stop the LWP and hang forever waiting for a stop | |
4461 | status. Note that we must not throw after this is cleared, | |
4462 | otherwise handle_zombie_lwp_error would get confused. */ | |
4463 | lwp->stopped = 0; | |
4464 | lwp->stop_reason = TARGET_STOPPED_BY_NO_REASON; | |
4465 | } | |
4466 | ||
4467 | /* Called when we try to resume a stopped LWP and that errors out. If | |
4468 | the LWP is no longer in ptrace-stopped state (meaning it's zombie, | |
4469 | or about to become), discard the error, clear any pending status | |
4470 | the LWP may have, and return true (we'll collect the exit status | |
4471 | soon enough). Otherwise, return false. */ | |
4472 | ||
4473 | static int | |
4474 | check_ptrace_stopped_lwp_gone (struct lwp_info *lp) | |
4475 | { | |
4476 | struct thread_info *thread = get_lwp_thread (lp); | |
4477 | ||
4478 | /* If we get an error after resuming the LWP successfully, we'd | |
4479 | confuse !T state for the LWP being gone. */ | |
4480 | gdb_assert (lp->stopped); | |
4481 | ||
4482 | /* We can't just check whether the LWP is in 'Z (Zombie)' state, | |
4483 | because even if ptrace failed with ESRCH, the tracee may be "not | |
4484 | yet fully dead", but already refusing ptrace requests. In that | |
4485 | case the tracee has 'R (Running)' state for a little bit | |
4486 | (observed in Linux 3.18). See also the note on ESRCH in the | |
4487 | ptrace(2) man page. Instead, check whether the LWP has any state | |
4488 | other than ptrace-stopped. */ | |
4489 | ||
4490 | /* Don't assume anything if /proc/PID/status can't be read. */ | |
4491 | if (linux_proc_pid_is_trace_stopped_nowarn (lwpid_of (thread)) == 0) | |
3221518c | 4492 | { |
23f238d3 PA |
4493 | lp->stop_reason = TARGET_STOPPED_BY_NO_REASON; |
4494 | lp->status_pending_p = 0; | |
4495 | return 1; | |
4496 | } | |
4497 | return 0; | |
4498 | } | |
4499 | ||
4500 | /* Like linux_resume_one_lwp_throw, but no error is thrown if the LWP | |
4501 | disappears while we try to resume it. */ | |
3221518c | 4502 | |
23f238d3 PA |
4503 | static void |
4504 | linux_resume_one_lwp (struct lwp_info *lwp, | |
4505 | int step, int signal, siginfo_t *info) | |
4506 | { | |
4507 | TRY | |
4508 | { | |
4509 | linux_resume_one_lwp_throw (lwp, step, signal, info); | |
4510 | } | |
4511 | CATCH (ex, RETURN_MASK_ERROR) | |
4512 | { | |
4513 | if (!check_ptrace_stopped_lwp_gone (lwp)) | |
4514 | throw_exception (ex); | |
3221518c | 4515 | } |
23f238d3 | 4516 | END_CATCH |
da6d8c04 DJ |
4517 | } |
4518 | ||
5fdda392 SM |
4519 | /* This function is called once per thread via for_each_thread. |
4520 | We look up which resume request applies to THREAD and mark it with a | |
4521 | pointer to the appropriate resume request. | |
5544ad89 DJ |
4522 | |
4523 | This algorithm is O(threads * resume elements), but resume elements | |
4524 | is small (and will remain small at least until GDB supports thread | |
4525 | suspension). */ | |
ebcf782c | 4526 | |
5fdda392 SM |
4527 | static void |
4528 | linux_set_resume_request (thread_info *thread, thread_resume *resume, size_t n) | |
0d62e5e8 | 4529 | { |
d86d4aaf | 4530 | struct lwp_info *lwp = get_thread_lwp (thread); |
64386c31 | 4531 | |
5fdda392 | 4532 | for (int ndx = 0; ndx < n; ndx++) |
95954743 | 4533 | { |
5fdda392 | 4534 | ptid_t ptid = resume[ndx].thread; |
d7e15655 | 4535 | if (ptid == minus_one_ptid |
9c80ecd6 | 4536 | || ptid == thread->id |
0c9070b3 YQ |
4537 | /* Handle both 'pPID' and 'pPID.-1' as meaning 'all threads |
4538 | of PID'. */ | |
e99b03dc | 4539 | || (ptid.pid () == pid_of (thread) |
0e998d96 | 4540 | && (ptid.is_pid () |
e38504b3 | 4541 | || ptid.lwp () == -1))) |
95954743 | 4542 | { |
5fdda392 | 4543 | if (resume[ndx].kind == resume_stop |
8336d594 | 4544 | && thread->last_resume_kind == resume_stop) |
d50171e4 PA |
4545 | { |
4546 | if (debug_threads) | |
87ce2a04 DE |
4547 | debug_printf ("already %s LWP %ld at GDB's request\n", |
4548 | (thread->last_status.kind | |
4549 | == TARGET_WAITKIND_STOPPED) | |
4550 | ? "stopped" | |
4551 | : "stopping", | |
d86d4aaf | 4552 | lwpid_of (thread)); |
d50171e4 PA |
4553 | |
4554 | continue; | |
4555 | } | |
4556 | ||
5a04c4cf PA |
4557 | /* Ignore (wildcard) resume requests for already-resumed |
4558 | threads. */ | |
5fdda392 | 4559 | if (resume[ndx].kind != resume_stop |
5a04c4cf PA |
4560 | && thread->last_resume_kind != resume_stop) |
4561 | { | |
4562 | if (debug_threads) | |
4563 | debug_printf ("already %s LWP %ld at GDB's request\n", | |
4564 | (thread->last_resume_kind | |
4565 | == resume_step) | |
4566 | ? "stepping" | |
4567 | : "continuing", | |
4568 | lwpid_of (thread)); | |
4569 | continue; | |
4570 | } | |
4571 | ||
4572 | /* Don't let wildcard resumes resume fork children that GDB | |
4573 | does not yet know are new fork children. */ | |
4574 | if (lwp->fork_relative != NULL) | |
4575 | { | |
5a04c4cf PA |
4576 | struct lwp_info *rel = lwp->fork_relative; |
4577 | ||
4578 | if (rel->status_pending_p | |
4579 | && (rel->waitstatus.kind == TARGET_WAITKIND_FORKED | |
4580 | || rel->waitstatus.kind == TARGET_WAITKIND_VFORKED)) | |
4581 | { | |
4582 | if (debug_threads) | |
4583 | debug_printf ("not resuming LWP %ld: has queued stop reply\n", | |
4584 | lwpid_of (thread)); | |
4585 | continue; | |
4586 | } | |
4587 | } | |
4588 | ||
4589 | /* If the thread has a pending event that has already been | |
4590 | reported to GDBserver core, but GDB has not pulled the | |
4591 | event out of the vStopped queue yet, likewise, ignore the | |
4592 | (wildcard) resume request. */ | |
9c80ecd6 | 4593 | if (in_queued_stop_replies (thread->id)) |
5a04c4cf PA |
4594 | { |
4595 | if (debug_threads) | |
4596 | debug_printf ("not resuming LWP %ld: has queued stop reply\n", | |
4597 | lwpid_of (thread)); | |
4598 | continue; | |
4599 | } | |
4600 | ||
5fdda392 | 4601 | lwp->resume = &resume[ndx]; |
8336d594 | 4602 | thread->last_resume_kind = lwp->resume->kind; |
fa593d66 | 4603 | |
c2d6af84 PA |
4604 | lwp->step_range_start = lwp->resume->step_range_start; |
4605 | lwp->step_range_end = lwp->resume->step_range_end; | |
4606 | ||
fa593d66 PA |
4607 | /* If we had a deferred signal to report, dequeue one now. |
4608 | This can happen if LWP gets more than one signal while | |
4609 | trying to get out of a jump pad. */ | |
4610 | if (lwp->stopped | |
4611 | && !lwp->status_pending_p | |
4612 | && dequeue_one_deferred_signal (lwp, &lwp->status_pending)) | |
4613 | { | |
4614 | lwp->status_pending_p = 1; | |
4615 | ||
4616 | if (debug_threads) | |
87ce2a04 DE |
4617 | debug_printf ("Dequeueing deferred signal %d for LWP %ld, " |
4618 | "leaving status pending.\n", | |
d86d4aaf DE |
4619 | WSTOPSIG (lwp->status_pending), |
4620 | lwpid_of (thread)); | |
fa593d66 PA |
4621 | } |
4622 | ||
5fdda392 | 4623 | return; |
95954743 PA |
4624 | } |
4625 | } | |
2bd7c093 PA |
4626 | |
4627 | /* No resume action for this thread. */ | |
4628 | lwp->resume = NULL; | |
5544ad89 DJ |
4629 | } |
4630 | ||
8f86d7aa SM |
4631 | /* find_thread callback for linux_resume. Return true if this lwp has an |
4632 | interesting status pending. */ | |
5544ad89 | 4633 | |
25c28b4d SM |
4634 | static bool |
4635 | resume_status_pending_p (thread_info *thread) | |
5544ad89 | 4636 | { |
d86d4aaf | 4637 | struct lwp_info *lwp = get_thread_lwp (thread); |
5544ad89 | 4638 | |
bd99dc85 PA |
4639 | /* LWPs which will not be resumed are not interesting, because |
4640 | we might not wait for them next time through linux_wait. */ | |
2bd7c093 | 4641 | if (lwp->resume == NULL) |
25c28b4d | 4642 | return false; |
64386c31 | 4643 | |
25c28b4d | 4644 | return thread_still_has_status_pending_p (thread); |
d50171e4 PA |
4645 | } |
4646 | ||
4647 | /* Return 1 if this lwp that GDB wants running is stopped at an | |
4648 | internal breakpoint that we need to step over. It assumes that any | |
4649 | required STOP_PC adjustment has already been propagated to the | |
4650 | inferior's regcache. */ | |
4651 | ||
eca55aec SM |
4652 | static bool |
4653 | need_step_over_p (thread_info *thread) | |
d50171e4 | 4654 | { |
d86d4aaf | 4655 | struct lwp_info *lwp = get_thread_lwp (thread); |
0bfdf32f | 4656 | struct thread_info *saved_thread; |
d50171e4 | 4657 | CORE_ADDR pc; |
c06cbd92 YQ |
4658 | struct process_info *proc = get_thread_process (thread); |
4659 | ||
4660 | /* GDBserver is skipping the extra traps from the wrapper program, | |
4661 | don't have to do step over. */ | |
4662 | if (proc->tdesc == NULL) | |
eca55aec | 4663 | return false; |
d50171e4 PA |
4664 | |
4665 | /* LWPs which will not be resumed are not interesting, because we | |
4666 | might not wait for them next time through linux_wait. */ | |
4667 | ||
4668 | if (!lwp->stopped) | |
4669 | { | |
4670 | if (debug_threads) | |
87ce2a04 | 4671 | debug_printf ("Need step over [LWP %ld]? Ignoring, not stopped\n", |
d86d4aaf | 4672 | lwpid_of (thread)); |
eca55aec | 4673 | return false; |
d50171e4 PA |
4674 | } |
4675 | ||
8336d594 | 4676 | if (thread->last_resume_kind == resume_stop) |
d50171e4 PA |
4677 | { |
4678 | if (debug_threads) | |
87ce2a04 DE |
4679 | debug_printf ("Need step over [LWP %ld]? Ignoring, should remain" |
4680 | " stopped\n", | |
d86d4aaf | 4681 | lwpid_of (thread)); |
eca55aec | 4682 | return false; |
d50171e4 PA |
4683 | } |
4684 | ||
7984d532 PA |
4685 | gdb_assert (lwp->suspended >= 0); |
4686 | ||
4687 | if (lwp->suspended) | |
4688 | { | |
4689 | if (debug_threads) | |
87ce2a04 | 4690 | debug_printf ("Need step over [LWP %ld]? Ignoring, suspended\n", |
d86d4aaf | 4691 | lwpid_of (thread)); |
eca55aec | 4692 | return false; |
7984d532 PA |
4693 | } |
4694 | ||
bd99dc85 | 4695 | if (lwp->status_pending_p) |
d50171e4 PA |
4696 | { |
4697 | if (debug_threads) | |
87ce2a04 DE |
4698 | debug_printf ("Need step over [LWP %ld]? Ignoring, has pending" |
4699 | " status.\n", | |
d86d4aaf | 4700 | lwpid_of (thread)); |
eca55aec | 4701 | return false; |
d50171e4 PA |
4702 | } |
4703 | ||
4704 | /* Note: PC, not STOP_PC. Either GDB has adjusted the PC already, | |
4705 | or we have. */ | |
4706 | pc = get_pc (lwp); | |
4707 | ||
4708 | /* If the PC has changed since we stopped, then don't do anything, | |
4709 | and let the breakpoint/tracepoint be hit. This happens if, for | |
4710 | instance, GDB handled the decr_pc_after_break subtraction itself, | |
4711 | GDB is OOL stepping this thread, or the user has issued a "jump" | |
4712 | command, or poked thread's registers herself. */ | |
4713 | if (pc != lwp->stop_pc) | |
4714 | { | |
4715 | if (debug_threads) | |
87ce2a04 DE |
4716 | debug_printf ("Need step over [LWP %ld]? Cancelling, PC was changed. " |
4717 | "Old stop_pc was 0x%s, PC is now 0x%s\n", | |
d86d4aaf DE |
4718 | lwpid_of (thread), |
4719 | paddress (lwp->stop_pc), paddress (pc)); | |
eca55aec | 4720 | return false; |
d50171e4 PA |
4721 | } |
4722 | ||
484b3c32 YQ |
4723 | /* On software single step target, resume the inferior with signal |
4724 | rather than stepping over. */ | |
4725 | if (can_software_single_step () | |
4726 | && lwp->pending_signals != NULL | |
4727 | && lwp_signal_can_be_delivered (lwp)) | |
4728 | { | |
4729 | if (debug_threads) | |
4730 | debug_printf ("Need step over [LWP %ld]? Ignoring, has pending" | |
4731 | " signals.\n", | |
4732 | lwpid_of (thread)); | |
4733 | ||
eca55aec | 4734 | return false; |
484b3c32 YQ |
4735 | } |
4736 | ||
0bfdf32f GB |
4737 | saved_thread = current_thread; |
4738 | current_thread = thread; | |
d50171e4 | 4739 | |
8b07ae33 | 4740 | /* We can only step over breakpoints we know about. */ |
fa593d66 | 4741 | if (breakpoint_here (pc) || fast_tracepoint_jump_here (pc)) |
d50171e4 | 4742 | { |
8b07ae33 | 4743 | /* Don't step over a breakpoint that GDB expects to hit |
9f3a5c85 LM |
4744 | though. If the condition is being evaluated on the target's side |
4745 | and it evaluate to false, step over this breakpoint as well. */ | |
4746 | if (gdb_breakpoint_here (pc) | |
d3ce09f5 SS |
4747 | && gdb_condition_true_at_breakpoint (pc) |
4748 | && gdb_no_commands_at_breakpoint (pc)) | |
8b07ae33 PA |
4749 | { |
4750 | if (debug_threads) | |
87ce2a04 DE |
4751 | debug_printf ("Need step over [LWP %ld]? yes, but found" |
4752 | " GDB breakpoint at 0x%s; skipping step over\n", | |
d86d4aaf | 4753 | lwpid_of (thread), paddress (pc)); |
d50171e4 | 4754 | |
0bfdf32f | 4755 | current_thread = saved_thread; |
eca55aec | 4756 | return false; |
8b07ae33 PA |
4757 | } |
4758 | else | |
4759 | { | |
4760 | if (debug_threads) | |
87ce2a04 DE |
4761 | debug_printf ("Need step over [LWP %ld]? yes, " |
4762 | "found breakpoint at 0x%s\n", | |
d86d4aaf | 4763 | lwpid_of (thread), paddress (pc)); |
d50171e4 | 4764 | |
8b07ae33 | 4765 | /* We've found an lwp that needs stepping over --- return 1 so |
8f86d7aa | 4766 | that find_thread stops looking. */ |
0bfdf32f | 4767 | current_thread = saved_thread; |
8b07ae33 | 4768 | |
eca55aec | 4769 | return true; |
8b07ae33 | 4770 | } |
d50171e4 PA |
4771 | } |
4772 | ||
0bfdf32f | 4773 | current_thread = saved_thread; |
d50171e4 PA |
4774 | |
4775 | if (debug_threads) | |
87ce2a04 DE |
4776 | debug_printf ("Need step over [LWP %ld]? No, no breakpoint found" |
4777 | " at 0x%s\n", | |
d86d4aaf | 4778 | lwpid_of (thread), paddress (pc)); |
c6ecbae5 | 4779 | |
eca55aec | 4780 | return false; |
5544ad89 DJ |
4781 | } |
4782 | ||
d50171e4 PA |
4783 | /* Start a step-over operation on LWP. When LWP stopped at a |
4784 | breakpoint, to make progress, we need to remove the breakpoint out | |
4785 | of the way. If we let other threads run while we do that, they may | |
4786 | pass by the breakpoint location and miss hitting it. To avoid | |
4787 | that, a step-over momentarily stops all threads while LWP is | |
c40c8d4b YQ |
4788 | single-stepped by either hardware or software while the breakpoint |
4789 | is temporarily uninserted from the inferior. When the single-step | |
4790 | finishes, we reinsert the breakpoint, and let all threads that are | |
4791 | supposed to be running, run again. */ | |
d50171e4 PA |
4792 | |
4793 | static int | |
4794 | start_step_over (struct lwp_info *lwp) | |
4795 | { | |
d86d4aaf | 4796 | struct thread_info *thread = get_lwp_thread (lwp); |
0bfdf32f | 4797 | struct thread_info *saved_thread; |
d50171e4 PA |
4798 | CORE_ADDR pc; |
4799 | int step; | |
4800 | ||
4801 | if (debug_threads) | |
87ce2a04 | 4802 | debug_printf ("Starting step-over on LWP %ld. Stopping all threads\n", |
d86d4aaf | 4803 | lwpid_of (thread)); |
d50171e4 | 4804 | |
7984d532 | 4805 | stop_all_lwps (1, lwp); |
863d01bd PA |
4806 | |
4807 | if (lwp->suspended != 0) | |
4808 | { | |
4809 | internal_error (__FILE__, __LINE__, | |
4810 | "LWP %ld suspended=%d\n", lwpid_of (thread), | |
4811 | lwp->suspended); | |
4812 | } | |
d50171e4 PA |
4813 | |
4814 | if (debug_threads) | |
87ce2a04 | 4815 | debug_printf ("Done stopping all threads for step-over.\n"); |
d50171e4 PA |
4816 | |
4817 | /* Note, we should always reach here with an already adjusted PC, | |
4818 | either by GDB (if we're resuming due to GDB's request), or by our | |
4819 | caller, if we just finished handling an internal breakpoint GDB | |
4820 | shouldn't care about. */ | |
4821 | pc = get_pc (lwp); | |
4822 | ||
0bfdf32f GB |
4823 | saved_thread = current_thread; |
4824 | current_thread = thread; | |
d50171e4 PA |
4825 | |
4826 | lwp->bp_reinsert = pc; | |
4827 | uninsert_breakpoints_at (pc); | |
fa593d66 | 4828 | uninsert_fast_tracepoint_jumps_at (pc); |
d50171e4 | 4829 | |
7fe5e27e | 4830 | step = single_step (lwp); |
d50171e4 | 4831 | |
0bfdf32f | 4832 | current_thread = saved_thread; |
d50171e4 PA |
4833 | |
4834 | linux_resume_one_lwp (lwp, step, 0, NULL); | |
4835 | ||
4836 | /* Require next event from this LWP. */ | |
9c80ecd6 | 4837 | step_over_bkpt = thread->id; |
d50171e4 PA |
4838 | return 1; |
4839 | } | |
4840 | ||
4841 | /* Finish a step-over. Reinsert the breakpoint we had uninserted in | |
3b9a79ef | 4842 | start_step_over, if still there, and delete any single-step |
d50171e4 PA |
4843 | breakpoints we've set, on non hardware single-step targets. */ |
4844 | ||
4845 | static int | |
4846 | finish_step_over (struct lwp_info *lwp) | |
4847 | { | |
4848 | if (lwp->bp_reinsert != 0) | |
4849 | { | |
f79b145d YQ |
4850 | struct thread_info *saved_thread = current_thread; |
4851 | ||
d50171e4 | 4852 | if (debug_threads) |
87ce2a04 | 4853 | debug_printf ("Finished step over.\n"); |
d50171e4 | 4854 | |
f79b145d YQ |
4855 | current_thread = get_lwp_thread (lwp); |
4856 | ||
d50171e4 PA |
4857 | /* Reinsert any breakpoint at LWP->BP_REINSERT. Note that there |
4858 | may be no breakpoint to reinsert there by now. */ | |
4859 | reinsert_breakpoints_at (lwp->bp_reinsert); | |
fa593d66 | 4860 | reinsert_fast_tracepoint_jumps_at (lwp->bp_reinsert); |
d50171e4 PA |
4861 | |
4862 | lwp->bp_reinsert = 0; | |
4863 | ||
3b9a79ef YQ |
4864 | /* Delete any single-step breakpoints. No longer needed. We |
4865 | don't have to worry about other threads hitting this trap, | |
4866 | and later not being able to explain it, because we were | |
4867 | stepping over a breakpoint, and we hold all threads but | |
4868 | LWP stopped while doing that. */ | |
d50171e4 | 4869 | if (!can_hardware_single_step ()) |
f79b145d | 4870 | { |
3b9a79ef YQ |
4871 | gdb_assert (has_single_step_breakpoints (current_thread)); |
4872 | delete_single_step_breakpoints (current_thread); | |
f79b145d | 4873 | } |
d50171e4 PA |
4874 | |
4875 | step_over_bkpt = null_ptid; | |
f79b145d | 4876 | current_thread = saved_thread; |
d50171e4 PA |
4877 | return 1; |
4878 | } | |
4879 | else | |
4880 | return 0; | |
4881 | } | |
4882 | ||
863d01bd PA |
4883 | /* If there's a step over in progress, wait until all threads stop |
4884 | (that is, until the stepping thread finishes its step), and | |
4885 | unsuspend all lwps. The stepping thread ends with its status | |
4886 | pending, which is processed later when we get back to processing | |
4887 | events. */ | |
4888 | ||
4889 | static void | |
4890 | complete_ongoing_step_over (void) | |
4891 | { | |
d7e15655 | 4892 | if (step_over_bkpt != null_ptid) |
863d01bd PA |
4893 | { |
4894 | struct lwp_info *lwp; | |
4895 | int wstat; | |
4896 | int ret; | |
4897 | ||
4898 | if (debug_threads) | |
4899 | debug_printf ("detach: step over in progress, finish it first\n"); | |
4900 | ||
4901 | /* Passing NULL_PTID as filter indicates we want all events to | |
4902 | be left pending. Eventually this returns when there are no | |
4903 | unwaited-for children left. */ | |
4904 | ret = linux_wait_for_event_filtered (minus_one_ptid, null_ptid, | |
4905 | &wstat, __WALL); | |
4906 | gdb_assert (ret == -1); | |
4907 | ||
4908 | lwp = find_lwp_pid (step_over_bkpt); | |
4909 | if (lwp != NULL) | |
4910 | finish_step_over (lwp); | |
4911 | step_over_bkpt = null_ptid; | |
4912 | unsuspend_all_lwps (lwp); | |
4913 | } | |
4914 | } | |
4915 | ||
5544ad89 DJ |
4916 | /* This function is called once per thread. We check the thread's resume |
4917 | request, which will tell us whether to resume, step, or leave the thread | |
bd99dc85 | 4918 | stopped; and what signal, if any, it should be sent. |
5544ad89 | 4919 | |
bd99dc85 PA |
4920 | For threads which we aren't explicitly told otherwise, we preserve |
4921 | the stepping flag; this is used for stepping over gdbserver-placed | |
4922 | breakpoints. | |
4923 | ||
4924 | If pending_flags was set in any thread, we queue any needed | |
4925 | signals, since we won't actually resume. We already have a pending | |
4926 | event to report, so we don't need to preserve any step requests; | |
4927 | they should be re-issued if necessary. */ | |
4928 | ||
c80825ff SM |
4929 | static void |
4930 | linux_resume_one_thread (thread_info *thread, bool leave_all_stopped) | |
5544ad89 | 4931 | { |
d86d4aaf | 4932 | struct lwp_info *lwp = get_thread_lwp (thread); |
d50171e4 | 4933 | int leave_pending; |
5544ad89 | 4934 | |
2bd7c093 | 4935 | if (lwp->resume == NULL) |
c80825ff | 4936 | return; |
5544ad89 | 4937 | |
bd99dc85 | 4938 | if (lwp->resume->kind == resume_stop) |
5544ad89 | 4939 | { |
bd99dc85 | 4940 | if (debug_threads) |
d86d4aaf | 4941 | debug_printf ("resume_stop request for LWP %ld\n", lwpid_of (thread)); |
bd99dc85 PA |
4942 | |
4943 | if (!lwp->stopped) | |
4944 | { | |
4945 | if (debug_threads) | |
d86d4aaf | 4946 | debug_printf ("stopping LWP %ld\n", lwpid_of (thread)); |
bd99dc85 | 4947 | |
d50171e4 PA |
4948 | /* Stop the thread, and wait for the event asynchronously, |
4949 | through the event loop. */ | |
02fc4de7 | 4950 | send_sigstop (lwp); |
bd99dc85 PA |
4951 | } |
4952 | else | |
4953 | { | |
4954 | if (debug_threads) | |
87ce2a04 | 4955 | debug_printf ("already stopped LWP %ld\n", |
d86d4aaf | 4956 | lwpid_of (thread)); |
d50171e4 PA |
4957 | |
4958 | /* The LWP may have been stopped in an internal event that | |
4959 | was not meant to be notified back to GDB (e.g., gdbserver | |
4960 | breakpoint), so we should be reporting a stop event in | |
4961 | this case too. */ | |
4962 | ||
4963 | /* If the thread already has a pending SIGSTOP, this is a | |
4964 | no-op. Otherwise, something later will presumably resume | |
4965 | the thread and this will cause it to cancel any pending | |
4966 | operation, due to last_resume_kind == resume_stop. If | |
4967 | the thread already has a pending status to report, we | |
4968 | will still report it the next time we wait - see | |
4969 | status_pending_p_callback. */ | |
1a981360 PA |
4970 | |
4971 | /* If we already have a pending signal to report, then | |
4972 | there's no need to queue a SIGSTOP, as this means we're | |
4973 | midway through moving the LWP out of the jumppad, and we | |
4974 | will report the pending signal as soon as that is | |
4975 | finished. */ | |
4976 | if (lwp->pending_signals_to_report == NULL) | |
4977 | send_sigstop (lwp); | |
bd99dc85 | 4978 | } |
32ca6d61 | 4979 | |
bd99dc85 PA |
4980 | /* For stop requests, we're done. */ |
4981 | lwp->resume = NULL; | |
fc7238bb | 4982 | thread->last_status.kind = TARGET_WAITKIND_IGNORE; |
c80825ff | 4983 | return; |
5544ad89 DJ |
4984 | } |
4985 | ||
bd99dc85 | 4986 | /* If this thread which is about to be resumed has a pending status, |
863d01bd PA |
4987 | then don't resume it - we can just report the pending status. |
4988 | Likewise if it is suspended, because e.g., another thread is | |
4989 | stepping past a breakpoint. Make sure to queue any signals that | |
4990 | would otherwise be sent. In all-stop mode, we do this decision | |
4991 | based on if *any* thread has a pending status. If there's a | |
4992 | thread that needs the step-over-breakpoint dance, then don't | |
4993 | resume any other thread but that particular one. */ | |
4994 | leave_pending = (lwp->suspended | |
4995 | || lwp->status_pending_p | |
4996 | || leave_all_stopped); | |
5544ad89 | 4997 | |
0e9a339e YQ |
4998 | /* If we have a new signal, enqueue the signal. */ |
4999 | if (lwp->resume->sig != 0) | |
5000 | { | |
5001 | siginfo_t info, *info_p; | |
5002 | ||
5003 | /* If this is the same signal we were previously stopped by, | |
5004 | make sure to queue its siginfo. */ | |
5005 | if (WIFSTOPPED (lwp->last_status) | |
5006 | && WSTOPSIG (lwp->last_status) == lwp->resume->sig | |
5007 | && ptrace (PTRACE_GETSIGINFO, lwpid_of (thread), | |
5008 | (PTRACE_TYPE_ARG3) 0, &info) == 0) | |
5009 | info_p = &info; | |
5010 | else | |
5011 | info_p = NULL; | |
5012 | ||
5013 | enqueue_pending_signal (lwp, lwp->resume->sig, info_p); | |
5014 | } | |
5015 | ||
d50171e4 | 5016 | if (!leave_pending) |
bd99dc85 PA |
5017 | { |
5018 | if (debug_threads) | |
d86d4aaf | 5019 | debug_printf ("resuming LWP %ld\n", lwpid_of (thread)); |
5544ad89 | 5020 | |
9c80ecd6 | 5021 | proceed_one_lwp (thread, NULL); |
bd99dc85 PA |
5022 | } |
5023 | else | |
5024 | { | |
5025 | if (debug_threads) | |
d86d4aaf | 5026 | debug_printf ("leaving LWP %ld stopped\n", lwpid_of (thread)); |
bd99dc85 | 5027 | } |
5544ad89 | 5028 | |
fc7238bb | 5029 | thread->last_status.kind = TARGET_WAITKIND_IGNORE; |
bd99dc85 | 5030 | lwp->resume = NULL; |
0d62e5e8 DJ |
5031 | } |
5032 | ||
5033 | static void | |
2bd7c093 | 5034 | linux_resume (struct thread_resume *resume_info, size_t n) |
0d62e5e8 | 5035 | { |
d86d4aaf | 5036 | struct thread_info *need_step_over = NULL; |
c6ecbae5 | 5037 | |
87ce2a04 DE |
5038 | if (debug_threads) |
5039 | { | |
5040 | debug_enter (); | |
5041 | debug_printf ("linux_resume:\n"); | |
5042 | } | |
5043 | ||
5fdda392 SM |
5044 | for_each_thread ([&] (thread_info *thread) |
5045 | { | |
5046 | linux_set_resume_request (thread, resume_info, n); | |
5047 | }); | |
5544ad89 | 5048 | |
d50171e4 PA |
5049 | /* If there is a thread which would otherwise be resumed, which has |
5050 | a pending status, then don't resume any threads - we can just | |
5051 | report the pending status. Make sure to queue any signals that | |
5052 | would otherwise be sent. In non-stop mode, we'll apply this | |
5053 | logic to each thread individually. We consume all pending events | |
5054 | before considering to start a step-over (in all-stop). */ | |
25c28b4d | 5055 | bool any_pending = false; |
bd99dc85 | 5056 | if (!non_stop) |
25c28b4d | 5057 | any_pending = find_thread (resume_status_pending_p) != NULL; |
d50171e4 PA |
5058 | |
5059 | /* If there is a thread which would otherwise be resumed, which is | |
5060 | stopped at a breakpoint that needs stepping over, then don't | |
5061 | resume any threads - have it step over the breakpoint with all | |
5062 | other threads stopped, then resume all threads again. Make sure | |
5063 | to queue any signals that would otherwise be delivered or | |
5064 | queued. */ | |
5065 | if (!any_pending && supports_breakpoints ()) | |
eca55aec | 5066 | need_step_over = find_thread (need_step_over_p); |
d50171e4 | 5067 | |
c80825ff | 5068 | bool leave_all_stopped = (need_step_over != NULL || any_pending); |
d50171e4 PA |
5069 | |
5070 | if (debug_threads) | |
5071 | { | |
5072 | if (need_step_over != NULL) | |
87ce2a04 | 5073 | debug_printf ("Not resuming all, need step over\n"); |
d50171e4 | 5074 | else if (any_pending) |
87ce2a04 DE |
5075 | debug_printf ("Not resuming, all-stop and found " |
5076 | "an LWP with pending status\n"); | |
d50171e4 | 5077 | else |
87ce2a04 | 5078 | debug_printf ("Resuming, no pending status or step over needed\n"); |
d50171e4 PA |
5079 | } |
5080 | ||
5081 | /* Even if we're leaving threads stopped, queue all signals we'd | |
5082 | otherwise deliver. */ | |
c80825ff SM |
5083 | for_each_thread ([&] (thread_info *thread) |
5084 | { | |
5085 | linux_resume_one_thread (thread, leave_all_stopped); | |
5086 | }); | |
d50171e4 PA |
5087 | |
5088 | if (need_step_over) | |
d86d4aaf | 5089 | start_step_over (get_thread_lwp (need_step_over)); |
87ce2a04 DE |
5090 | |
5091 | if (debug_threads) | |
5092 | { | |
5093 | debug_printf ("linux_resume done\n"); | |
5094 | debug_exit (); | |
5095 | } | |
1bebeeca PA |
5096 | |
5097 | /* We may have events that were pending that can/should be sent to | |
5098 | the client now. Trigger a linux_wait call. */ | |
5099 | if (target_is_async_p ()) | |
5100 | async_file_mark (); | |
d50171e4 PA |
5101 | } |
5102 | ||
5103 | /* This function is called once per thread. We check the thread's | |
5104 | last resume request, which will tell us whether to resume, step, or | |
5105 | leave the thread stopped. Any signal the client requested to be | |
5106 | delivered has already been enqueued at this point. | |
5107 | ||
5108 | If any thread that GDB wants running is stopped at an internal | |
5109 | breakpoint that needs stepping over, we start a step-over operation | |
5110 | on that particular thread, and leave all others stopped. */ | |
5111 | ||
e2b44075 SM |
5112 | static void |
5113 | proceed_one_lwp (thread_info *thread, lwp_info *except) | |
d50171e4 | 5114 | { |
d86d4aaf | 5115 | struct lwp_info *lwp = get_thread_lwp (thread); |
d50171e4 PA |
5116 | int step; |
5117 | ||
7984d532 | 5118 | if (lwp == except) |
e2b44075 | 5119 | return; |
d50171e4 PA |
5120 | |
5121 | if (debug_threads) | |
d86d4aaf | 5122 | debug_printf ("proceed_one_lwp: lwp %ld\n", lwpid_of (thread)); |
d50171e4 PA |
5123 | |
5124 | if (!lwp->stopped) | |
5125 | { | |
5126 | if (debug_threads) | |
d86d4aaf | 5127 | debug_printf (" LWP %ld already running\n", lwpid_of (thread)); |
e2b44075 | 5128 | return; |
d50171e4 PA |
5129 | } |
5130 | ||
02fc4de7 PA |
5131 | if (thread->last_resume_kind == resume_stop |
5132 | && thread->last_status.kind != TARGET_WAITKIND_IGNORE) | |
d50171e4 PA |
5133 | { |
5134 | if (debug_threads) | |
87ce2a04 | 5135 | debug_printf (" client wants LWP to remain %ld stopped\n", |
d86d4aaf | 5136 | lwpid_of (thread)); |
e2b44075 | 5137 | return; |
d50171e4 PA |
5138 | } |
5139 | ||
5140 | if (lwp->status_pending_p) | |
5141 | { | |
5142 | if (debug_threads) | |
87ce2a04 | 5143 | debug_printf (" LWP %ld has pending status, leaving stopped\n", |
d86d4aaf | 5144 | lwpid_of (thread)); |
e2b44075 | 5145 | return; |
d50171e4 PA |
5146 | } |
5147 | ||
7984d532 PA |
5148 | gdb_assert (lwp->suspended >= 0); |
5149 | ||
d50171e4 PA |
5150 | if (lwp->suspended) |
5151 | { | |
5152 | if (debug_threads) | |
d86d4aaf | 5153 | debug_printf (" LWP %ld is suspended\n", lwpid_of (thread)); |
e2b44075 | 5154 | return; |
d50171e4 PA |
5155 | } |
5156 | ||
1a981360 PA |
5157 | if (thread->last_resume_kind == resume_stop |
5158 | && lwp->pending_signals_to_report == NULL | |
229d26fc SM |
5159 | && (lwp->collecting_fast_tracepoint |
5160 | == fast_tpoint_collect_result::not_collecting)) | |
02fc4de7 PA |
5161 | { |
5162 | /* We haven't reported this LWP as stopped yet (otherwise, the | |
5163 | last_status.kind check above would catch it, and we wouldn't | |
5164 | reach here. This LWP may have been momentarily paused by a | |
5165 | stop_all_lwps call while handling for example, another LWP's | |
5166 | step-over. In that case, the pending expected SIGSTOP signal | |
5167 | that was queued at vCont;t handling time will have already | |
5168 | been consumed by wait_for_sigstop, and so we need to requeue | |
5169 | another one here. Note that if the LWP already has a SIGSTOP | |
5170 | pending, this is a no-op. */ | |
5171 | ||
5172 | if (debug_threads) | |
87ce2a04 DE |
5173 | debug_printf ("Client wants LWP %ld to stop. " |
5174 | "Making sure it has a SIGSTOP pending\n", | |
d86d4aaf | 5175 | lwpid_of (thread)); |
02fc4de7 PA |
5176 | |
5177 | send_sigstop (lwp); | |
5178 | } | |
5179 | ||
863d01bd PA |
5180 | if (thread->last_resume_kind == resume_step) |
5181 | { | |
5182 | if (debug_threads) | |
5183 | debug_printf (" stepping LWP %ld, client wants it stepping\n", | |
5184 | lwpid_of (thread)); | |
8901d193 | 5185 | |
3b9a79ef | 5186 | /* If resume_step is requested by GDB, install single-step |
8901d193 | 5187 | breakpoints when the thread is about to be actually resumed if |
3b9a79ef YQ |
5188 | the single-step breakpoints weren't removed. */ |
5189 | if (can_software_single_step () | |
5190 | && !has_single_step_breakpoints (thread)) | |
8901d193 YQ |
5191 | install_software_single_step_breakpoints (lwp); |
5192 | ||
5193 | step = maybe_hw_step (thread); | |
863d01bd PA |
5194 | } |
5195 | else if (lwp->bp_reinsert != 0) | |
5196 | { | |
5197 | if (debug_threads) | |
5198 | debug_printf (" stepping LWP %ld, reinsert set\n", | |
5199 | lwpid_of (thread)); | |
f79b145d YQ |
5200 | |
5201 | step = maybe_hw_step (thread); | |
863d01bd PA |
5202 | } |
5203 | else | |
5204 | step = 0; | |
5205 | ||
d50171e4 | 5206 | linux_resume_one_lwp (lwp, step, 0, NULL); |
7984d532 PA |
5207 | } |
5208 | ||
e2b44075 SM |
5209 | static void |
5210 | unsuspend_and_proceed_one_lwp (thread_info *thread, lwp_info *except) | |
7984d532 | 5211 | { |
d86d4aaf | 5212 | struct lwp_info *lwp = get_thread_lwp (thread); |
7984d532 PA |
5213 | |
5214 | if (lwp == except) | |
e2b44075 | 5215 | return; |
7984d532 | 5216 | |
863d01bd | 5217 | lwp_suspended_decr (lwp); |
7984d532 | 5218 | |
e2b44075 | 5219 | proceed_one_lwp (thread, except); |
d50171e4 PA |
5220 | } |
5221 | ||
5222 | /* When we finish a step-over, set threads running again. If there's | |
5223 | another thread that may need a step-over, now's the time to start | |
5224 | it. Eventually, we'll move all threads past their breakpoints. */ | |
5225 | ||
5226 | static void | |
5227 | proceed_all_lwps (void) | |
5228 | { | |
d86d4aaf | 5229 | struct thread_info *need_step_over; |
d50171e4 PA |
5230 | |
5231 | /* If there is a thread which would otherwise be resumed, which is | |
5232 | stopped at a breakpoint that needs stepping over, then don't | |
5233 | resume any threads - have it step over the breakpoint with all | |
5234 | other threads stopped, then resume all threads again. */ | |
5235 | ||
5236 | if (supports_breakpoints ()) | |
5237 | { | |
eca55aec | 5238 | need_step_over = find_thread (need_step_over_p); |
d50171e4 PA |
5239 | |
5240 | if (need_step_over != NULL) | |
5241 | { | |
5242 | if (debug_threads) | |
87ce2a04 DE |
5243 | debug_printf ("proceed_all_lwps: found " |
5244 | "thread %ld needing a step-over\n", | |
5245 | lwpid_of (need_step_over)); | |
d50171e4 | 5246 | |
d86d4aaf | 5247 | start_step_over (get_thread_lwp (need_step_over)); |
d50171e4 PA |
5248 | return; |
5249 | } | |
5250 | } | |
5544ad89 | 5251 | |
d50171e4 | 5252 | if (debug_threads) |
87ce2a04 | 5253 | debug_printf ("Proceeding, no step-over needed\n"); |
d50171e4 | 5254 | |
e2b44075 SM |
5255 | for_each_thread ([] (thread_info *thread) |
5256 | { | |
5257 | proceed_one_lwp (thread, NULL); | |
5258 | }); | |
d50171e4 PA |
5259 | } |
5260 | ||
5261 | /* Stopped LWPs that the client wanted to be running, that don't have | |
5262 | pending statuses, are set to run again, except for EXCEPT, if not | |
5263 | NULL. This undoes a stop_all_lwps call. */ | |
5264 | ||
5265 | static void | |
7984d532 | 5266 | unstop_all_lwps (int unsuspend, struct lwp_info *except) |
d50171e4 | 5267 | { |
5544ad89 DJ |
5268 | if (debug_threads) |
5269 | { | |
87ce2a04 | 5270 | debug_enter (); |
d50171e4 | 5271 | if (except) |
87ce2a04 | 5272 | debug_printf ("unstopping all lwps, except=(LWP %ld)\n", |
d86d4aaf | 5273 | lwpid_of (get_lwp_thread (except))); |
5544ad89 | 5274 | else |
87ce2a04 | 5275 | debug_printf ("unstopping all lwps\n"); |
5544ad89 DJ |
5276 | } |
5277 | ||
7984d532 | 5278 | if (unsuspend) |
e2b44075 SM |
5279 | for_each_thread ([&] (thread_info *thread) |
5280 | { | |
5281 | unsuspend_and_proceed_one_lwp (thread, except); | |
5282 | }); | |
7984d532 | 5283 | else |
e2b44075 SM |
5284 | for_each_thread ([&] (thread_info *thread) |
5285 | { | |
5286 | proceed_one_lwp (thread, except); | |
5287 | }); | |
87ce2a04 DE |
5288 | |
5289 | if (debug_threads) | |
5290 | { | |
5291 | debug_printf ("unstop_all_lwps done\n"); | |
5292 | debug_exit (); | |
5293 | } | |
0d62e5e8 DJ |
5294 | } |
5295 | ||
58caa3dc DJ |
5296 | |
5297 | #ifdef HAVE_LINUX_REGSETS | |
5298 | ||
1faeff08 MR |
5299 | #define use_linux_regsets 1 |
5300 | ||
030031ee PA |
5301 | /* Returns true if REGSET has been disabled. */ |
5302 | ||
5303 | static int | |
5304 | regset_disabled (struct regsets_info *info, struct regset_info *regset) | |
5305 | { | |
5306 | return (info->disabled_regsets != NULL | |
5307 | && info->disabled_regsets[regset - info->regsets]); | |
5308 | } | |
5309 | ||
5310 | /* Disable REGSET. */ | |
5311 | ||
5312 | static void | |
5313 | disable_regset (struct regsets_info *info, struct regset_info *regset) | |
5314 | { | |
5315 | int dr_offset; | |
5316 | ||
5317 | dr_offset = regset - info->regsets; | |
5318 | if (info->disabled_regsets == NULL) | |
224c3ddb | 5319 | info->disabled_regsets = (char *) xcalloc (1, info->num_regsets); |
030031ee PA |
5320 | info->disabled_regsets[dr_offset] = 1; |
5321 | } | |
5322 | ||
58caa3dc | 5323 | static int |
3aee8918 PA |
5324 | regsets_fetch_inferior_registers (struct regsets_info *regsets_info, |
5325 | struct regcache *regcache) | |
58caa3dc DJ |
5326 | { |
5327 | struct regset_info *regset; | |
e9d25b98 | 5328 | int saw_general_regs = 0; |
95954743 | 5329 | int pid; |
1570b33e | 5330 | struct iovec iov; |
58caa3dc | 5331 | |
0bfdf32f | 5332 | pid = lwpid_of (current_thread); |
28eef672 | 5333 | for (regset = regsets_info->regsets; regset->size >= 0; regset++) |
58caa3dc | 5334 | { |
1570b33e L |
5335 | void *buf, *data; |
5336 | int nt_type, res; | |
58caa3dc | 5337 | |
030031ee | 5338 | if (regset->size == 0 || regset_disabled (regsets_info, regset)) |
28eef672 | 5339 | continue; |
58caa3dc | 5340 | |
bca929d3 | 5341 | buf = xmalloc (regset->size); |
1570b33e L |
5342 | |
5343 | nt_type = regset->nt_type; | |
5344 | if (nt_type) | |
5345 | { | |
5346 | iov.iov_base = buf; | |
5347 | iov.iov_len = regset->size; | |
5348 | data = (void *) &iov; | |
5349 | } | |
5350 | else | |
5351 | data = buf; | |
5352 | ||
dfb64f85 | 5353 | #ifndef __sparc__ |
f15f9948 | 5354 | res = ptrace (regset->get_request, pid, |
b8e1b30e | 5355 | (PTRACE_TYPE_ARG3) (long) nt_type, data); |
dfb64f85 | 5356 | #else |
1570b33e | 5357 | res = ptrace (regset->get_request, pid, data, nt_type); |
dfb64f85 | 5358 | #endif |
58caa3dc DJ |
5359 | if (res < 0) |
5360 | { | |
5361 | if (errno == EIO) | |
5362 | { | |
52fa2412 | 5363 | /* If we get EIO on a regset, do not try it again for |
3aee8918 | 5364 | this process mode. */ |
030031ee | 5365 | disable_regset (regsets_info, regset); |
58caa3dc | 5366 | } |
e5a9158d AA |
5367 | else if (errno == ENODATA) |
5368 | { | |
5369 | /* ENODATA may be returned if the regset is currently | |
5370 | not "active". This can happen in normal operation, | |
5371 | so suppress the warning in this case. */ | |
5372 | } | |
fcd4a73d YQ |
5373 | else if (errno == ESRCH) |
5374 | { | |
5375 | /* At this point, ESRCH should mean the process is | |
5376 | already gone, in which case we simply ignore attempts | |
5377 | to read its registers. */ | |
5378 | } | |
58caa3dc DJ |
5379 | else |
5380 | { | |
0d62e5e8 | 5381 | char s[256]; |
95954743 PA |
5382 | sprintf (s, "ptrace(regsets_fetch_inferior_registers) PID=%d", |
5383 | pid); | |
0d62e5e8 | 5384 | perror (s); |
58caa3dc DJ |
5385 | } |
5386 | } | |
098dbe61 AA |
5387 | else |
5388 | { | |
5389 | if (regset->type == GENERAL_REGS) | |
5390 | saw_general_regs = 1; | |
5391 | regset->store_function (regcache, buf); | |
5392 | } | |
fdeb2a12 | 5393 | free (buf); |
58caa3dc | 5394 | } |
e9d25b98 DJ |
5395 | if (saw_general_regs) |
5396 | return 0; | |
5397 | else | |
5398 | return 1; | |
58caa3dc DJ |
5399 | } |
5400 | ||
5401 | static int | |
3aee8918 PA |
5402 | regsets_store_inferior_registers (struct regsets_info *regsets_info, |
5403 | struct regcache *regcache) | |
58caa3dc DJ |
5404 | { |
5405 | struct regset_info *regset; | |
e9d25b98 | 5406 | int saw_general_regs = 0; |
95954743 | 5407 | int pid; |
1570b33e | 5408 | struct iovec iov; |
58caa3dc | 5409 | |
0bfdf32f | 5410 | pid = lwpid_of (current_thread); |
28eef672 | 5411 | for (regset = regsets_info->regsets; regset->size >= 0; regset++) |
58caa3dc | 5412 | { |
1570b33e L |
5413 | void *buf, *data; |
5414 | int nt_type, res; | |
58caa3dc | 5415 | |
feea5f36 AA |
5416 | if (regset->size == 0 || regset_disabled (regsets_info, regset) |
5417 | || regset->fill_function == NULL) | |
28eef672 | 5418 | continue; |
58caa3dc | 5419 | |
bca929d3 | 5420 | buf = xmalloc (regset->size); |
545587ee DJ |
5421 | |
5422 | /* First fill the buffer with the current register set contents, | |
5423 | in case there are any items in the kernel's regset that are | |
5424 | not in gdbserver's regcache. */ | |
1570b33e L |
5425 | |
5426 | nt_type = regset->nt_type; | |
5427 | if (nt_type) | |
5428 | { | |
5429 | iov.iov_base = buf; | |
5430 | iov.iov_len = regset->size; | |
5431 | data = (void *) &iov; | |
5432 | } | |
5433 | else | |
5434 | data = buf; | |
5435 | ||
dfb64f85 | 5436 | #ifndef __sparc__ |
f15f9948 | 5437 | res = ptrace (regset->get_request, pid, |
b8e1b30e | 5438 | (PTRACE_TYPE_ARG3) (long) nt_type, data); |
dfb64f85 | 5439 | #else |
689cc2ae | 5440 | res = ptrace (regset->get_request, pid, data, nt_type); |
dfb64f85 | 5441 | #endif |
545587ee DJ |
5442 | |
5443 | if (res == 0) | |
5444 | { | |
5445 | /* Then overlay our cached registers on that. */ | |
442ea881 | 5446 | regset->fill_function (regcache, buf); |
545587ee DJ |
5447 | |
5448 | /* Only now do we write the register set. */ | |
dfb64f85 | 5449 | #ifndef __sparc__ |
f15f9948 | 5450 | res = ptrace (regset->set_request, pid, |
b8e1b30e | 5451 | (PTRACE_TYPE_ARG3) (long) nt_type, data); |
dfb64f85 | 5452 | #else |
1570b33e | 5453 | res = ptrace (regset->set_request, pid, data, nt_type); |
dfb64f85 | 5454 | #endif |
545587ee DJ |
5455 | } |
5456 | ||
58caa3dc DJ |
5457 | if (res < 0) |
5458 | { | |
5459 | if (errno == EIO) | |
5460 | { | |
52fa2412 | 5461 | /* If we get EIO on a regset, do not try it again for |
3aee8918 | 5462 | this process mode. */ |
030031ee | 5463 | disable_regset (regsets_info, regset); |
58caa3dc | 5464 | } |
3221518c UW |
5465 | else if (errno == ESRCH) |
5466 | { | |
1b3f6016 PA |
5467 | /* At this point, ESRCH should mean the process is |
5468 | already gone, in which case we simply ignore attempts | |
5469 | to change its registers. See also the related | |
5470 | comment in linux_resume_one_lwp. */ | |
fdeb2a12 | 5471 | free (buf); |
3221518c UW |
5472 | return 0; |
5473 | } | |
58caa3dc DJ |
5474 | else |
5475 | { | |
ce3a066d | 5476 | perror ("Warning: ptrace(regsets_store_inferior_registers)"); |
58caa3dc DJ |
5477 | } |
5478 | } | |
e9d25b98 DJ |
5479 | else if (regset->type == GENERAL_REGS) |
5480 | saw_general_regs = 1; | |
09ec9b38 | 5481 | free (buf); |
58caa3dc | 5482 | } |
e9d25b98 DJ |
5483 | if (saw_general_regs) |
5484 | return 0; | |
5485 | else | |
5486 | return 1; | |
58caa3dc DJ |
5487 | } |
5488 | ||
1faeff08 | 5489 | #else /* !HAVE_LINUX_REGSETS */ |
58caa3dc | 5490 | |
1faeff08 | 5491 | #define use_linux_regsets 0 |
3aee8918 PA |
5492 | #define regsets_fetch_inferior_registers(regsets_info, regcache) 1 |
5493 | #define regsets_store_inferior_registers(regsets_info, regcache) 1 | |
58caa3dc | 5494 | |
58caa3dc | 5495 | #endif |
1faeff08 MR |
5496 | |
5497 | /* Return 1 if register REGNO is supported by one of the regset ptrace | |
5498 | calls or 0 if it has to be transferred individually. */ | |
5499 | ||
5500 | static int | |
3aee8918 | 5501 | linux_register_in_regsets (const struct regs_info *regs_info, int regno) |
1faeff08 MR |
5502 | { |
5503 | unsigned char mask = 1 << (regno % 8); | |
5504 | size_t index = regno / 8; | |
5505 | ||
5506 | return (use_linux_regsets | |
3aee8918 PA |
5507 | && (regs_info->regset_bitmap == NULL |
5508 | || (regs_info->regset_bitmap[index] & mask) != 0)); | |
1faeff08 MR |
5509 | } |
5510 | ||
58caa3dc | 5511 | #ifdef HAVE_LINUX_USRREGS |
1faeff08 | 5512 | |
5b3da067 | 5513 | static int |
3aee8918 | 5514 | register_addr (const struct usrregs_info *usrregs, int regnum) |
1faeff08 MR |
5515 | { |
5516 | int addr; | |
5517 | ||
3aee8918 | 5518 | if (regnum < 0 || regnum >= usrregs->num_regs) |
1faeff08 MR |
5519 | error ("Invalid register number %d.", regnum); |
5520 | ||
3aee8918 | 5521 | addr = usrregs->regmap[regnum]; |
1faeff08 MR |
5522 | |
5523 | return addr; | |
5524 | } | |
5525 | ||
5526 | /* Fetch one register. */ | |
5527 | static void | |
3aee8918 PA |
5528 | fetch_register (const struct usrregs_info *usrregs, |
5529 | struct regcache *regcache, int regno) | |
1faeff08 MR |
5530 | { |
5531 | CORE_ADDR regaddr; | |
5532 | int i, size; | |
5533 | char *buf; | |
5534 | int pid; | |
5535 | ||
3aee8918 | 5536 | if (regno >= usrregs->num_regs) |
1faeff08 MR |
5537 | return; |
5538 | if ((*the_low_target.cannot_fetch_register) (regno)) | |
5539 | return; | |
5540 | ||
3aee8918 | 5541 | regaddr = register_addr (usrregs, regno); |
1faeff08 MR |
5542 | if (regaddr == -1) |
5543 | return; | |
5544 | ||
3aee8918 PA |
5545 | size = ((register_size (regcache->tdesc, regno) |
5546 | + sizeof (PTRACE_XFER_TYPE) - 1) | |
1faeff08 | 5547 | & -sizeof (PTRACE_XFER_TYPE)); |
224c3ddb | 5548 | buf = (char *) alloca (size); |
1faeff08 | 5549 | |
0bfdf32f | 5550 | pid = lwpid_of (current_thread); |
1faeff08 MR |
5551 | for (i = 0; i < size; i += sizeof (PTRACE_XFER_TYPE)) |
5552 | { | |
5553 | errno = 0; | |
5554 | *(PTRACE_XFER_TYPE *) (buf + i) = | |
5555 | ptrace (PTRACE_PEEKUSER, pid, | |
5556 | /* Coerce to a uintptr_t first to avoid potential gcc warning | |
5557 | of coercing an 8 byte integer to a 4 byte pointer. */ | |
b8e1b30e | 5558 | (PTRACE_TYPE_ARG3) (uintptr_t) regaddr, (PTRACE_TYPE_ARG4) 0); |
1faeff08 MR |
5559 | regaddr += sizeof (PTRACE_XFER_TYPE); |
5560 | if (errno != 0) | |
9a70f35c YQ |
5561 | { |
5562 | /* Mark register REGNO unavailable. */ | |
5563 | supply_register (regcache, regno, NULL); | |
5564 | return; | |
5565 | } | |
1faeff08 MR |
5566 | } |
5567 | ||
5568 | if (the_low_target.supply_ptrace_register) | |
5569 | the_low_target.supply_ptrace_register (regcache, regno, buf); | |
5570 | else | |
5571 | supply_register (regcache, regno, buf); | |
5572 | } | |
5573 | ||
5574 | /* Store one register. */ | |
5575 | static void | |
3aee8918 PA |
5576 | store_register (const struct usrregs_info *usrregs, |
5577 | struct regcache *regcache, int regno) | |
1faeff08 MR |
5578 | { |
5579 | CORE_ADDR regaddr; | |
5580 | int i, size; | |
5581 | char *buf; | |
5582 | int pid; | |
5583 | ||
3aee8918 | 5584 | if (regno >= usrregs->num_regs) |
1faeff08 MR |
5585 | return; |
5586 | if ((*the_low_target.cannot_store_register) (regno)) | |
5587 | return; | |
5588 | ||
3aee8918 | 5589 | regaddr = register_addr (usrregs, regno); |
1faeff08 MR |
5590 | if (regaddr == -1) |
5591 | return; | |
5592 | ||
3aee8918 PA |
5593 | size = ((register_size (regcache->tdesc, regno) |
5594 | + sizeof (PTRACE_XFER_TYPE) - 1) | |
1faeff08 | 5595 | & -sizeof (PTRACE_XFER_TYPE)); |
224c3ddb | 5596 | buf = (char *) alloca (size); |
1faeff08 MR |
5597 | memset (buf, 0, size); |
5598 | ||
5599 | if (the_low_target.collect_ptrace_register) | |
5600 | the_low_target.collect_ptrace_register (regcache, regno, buf); | |
5601 | else | |
5602 | collect_register (regcache, regno, buf); | |
5603 | ||
0bfdf32f | 5604 | pid = lwpid_of (current_thread); |
1faeff08 MR |
5605 | for (i = 0; i < size; i += sizeof (PTRACE_XFER_TYPE)) |
5606 | { | |
5607 | errno = 0; | |
5608 | ptrace (PTRACE_POKEUSER, pid, | |
5609 | /* Coerce to a uintptr_t first to avoid potential gcc warning | |
5610 | about coercing an 8 byte integer to a 4 byte pointer. */ | |
b8e1b30e LM |
5611 | (PTRACE_TYPE_ARG3) (uintptr_t) regaddr, |
5612 | (PTRACE_TYPE_ARG4) *(PTRACE_XFER_TYPE *) (buf + i)); | |
1faeff08 MR |
5613 | if (errno != 0) |
5614 | { | |
5615 | /* At this point, ESRCH should mean the process is | |
5616 | already gone, in which case we simply ignore attempts | |
5617 | to change its registers. See also the related | |
5618 | comment in linux_resume_one_lwp. */ | |
5619 | if (errno == ESRCH) | |
5620 | return; | |
5621 | ||
5622 | if ((*the_low_target.cannot_store_register) (regno) == 0) | |
5623 | error ("writing register %d: %s", regno, strerror (errno)); | |
5624 | } | |
5625 | regaddr += sizeof (PTRACE_XFER_TYPE); | |
5626 | } | |
5627 | } | |
5628 | ||
5629 | /* Fetch all registers, or just one, from the child process. | |
5630 | If REGNO is -1, do this for all registers, skipping any that are | |
5631 | assumed to have been retrieved by regsets_fetch_inferior_registers, | |
5632 | unless ALL is non-zero. | |
5633 | Otherwise, REGNO specifies which register (so we can save time). */ | |
5634 | static void | |
3aee8918 PA |
5635 | usr_fetch_inferior_registers (const struct regs_info *regs_info, |
5636 | struct regcache *regcache, int regno, int all) | |
1faeff08 | 5637 | { |
3aee8918 PA |
5638 | struct usrregs_info *usr = regs_info->usrregs; |
5639 | ||
1faeff08 MR |
5640 | if (regno == -1) |
5641 | { | |
3aee8918 PA |
5642 | for (regno = 0; regno < usr->num_regs; regno++) |
5643 | if (all || !linux_register_in_regsets (regs_info, regno)) | |
5644 | fetch_register (usr, regcache, regno); | |
1faeff08 MR |
5645 | } |
5646 | else | |
3aee8918 | 5647 | fetch_register (usr, regcache, regno); |
1faeff08 MR |
5648 | } |
5649 | ||
5650 | /* Store our register values back into the inferior. | |
5651 | If REGNO is -1, do this for all registers, skipping any that are | |
5652 | assumed to have been saved by regsets_store_inferior_registers, | |
5653 | unless ALL is non-zero. | |
5654 | Otherwise, REGNO specifies which register (so we can save time). */ | |
5655 | static void | |
3aee8918 PA |
5656 | usr_store_inferior_registers (const struct regs_info *regs_info, |
5657 | struct regcache *regcache, int regno, int all) | |
1faeff08 | 5658 | { |
3aee8918 PA |
5659 | struct usrregs_info *usr = regs_info->usrregs; |
5660 | ||
1faeff08 MR |
5661 | if (regno == -1) |
5662 | { | |
3aee8918 PA |
5663 | for (regno = 0; regno < usr->num_regs; regno++) |
5664 | if (all || !linux_register_in_regsets (regs_info, regno)) | |
5665 | store_register (usr, regcache, regno); | |
1faeff08 MR |
5666 | } |
5667 | else | |
3aee8918 | 5668 | store_register (usr, regcache, regno); |
1faeff08 MR |
5669 | } |
5670 | ||
5671 | #else /* !HAVE_LINUX_USRREGS */ | |
5672 | ||
3aee8918 PA |
5673 | #define usr_fetch_inferior_registers(regs_info, regcache, regno, all) do {} while (0) |
5674 | #define usr_store_inferior_registers(regs_info, regcache, regno, all) do {} while (0) | |
1faeff08 | 5675 | |
58caa3dc | 5676 | #endif |
1faeff08 MR |
5677 | |
5678 | ||
5b3da067 | 5679 | static void |
1faeff08 MR |
5680 | linux_fetch_registers (struct regcache *regcache, int regno) |
5681 | { | |
5682 | int use_regsets; | |
5683 | int all = 0; | |
3aee8918 | 5684 | const struct regs_info *regs_info = (*the_low_target.regs_info) (); |
1faeff08 MR |
5685 | |
5686 | if (regno == -1) | |
5687 | { | |
3aee8918 PA |
5688 | if (the_low_target.fetch_register != NULL |
5689 | && regs_info->usrregs != NULL) | |
5690 | for (regno = 0; regno < regs_info->usrregs->num_regs; regno++) | |
c14dfd32 PA |
5691 | (*the_low_target.fetch_register) (regcache, regno); |
5692 | ||
3aee8918 PA |
5693 | all = regsets_fetch_inferior_registers (regs_info->regsets_info, regcache); |
5694 | if (regs_info->usrregs != NULL) | |
5695 | usr_fetch_inferior_registers (regs_info, regcache, -1, all); | |
1faeff08 MR |
5696 | } |
5697 | else | |
5698 | { | |
c14dfd32 PA |
5699 | if (the_low_target.fetch_register != NULL |
5700 | && (*the_low_target.fetch_register) (regcache, regno)) | |
5701 | return; | |
5702 | ||
3aee8918 | 5703 | use_regsets = linux_register_in_regsets (regs_info, regno); |
1faeff08 | 5704 | if (use_regsets) |
3aee8918 PA |
5705 | all = regsets_fetch_inferior_registers (regs_info->regsets_info, |
5706 | regcache); | |
5707 | if ((!use_regsets || all) && regs_info->usrregs != NULL) | |
5708 | usr_fetch_inferior_registers (regs_info, regcache, regno, 1); | |
1faeff08 | 5709 | } |
58caa3dc DJ |
5710 | } |
5711 | ||
5b3da067 | 5712 | static void |
442ea881 | 5713 | linux_store_registers (struct regcache *regcache, int regno) |
58caa3dc | 5714 | { |
1faeff08 MR |
5715 | int use_regsets; |
5716 | int all = 0; | |
3aee8918 | 5717 | const struct regs_info *regs_info = (*the_low_target.regs_info) (); |
1faeff08 MR |
5718 | |
5719 | if (regno == -1) | |
5720 | { | |
3aee8918 PA |
5721 | all = regsets_store_inferior_registers (regs_info->regsets_info, |
5722 | regcache); | |
5723 | if (regs_info->usrregs != NULL) | |
5724 | usr_store_inferior_registers (regs_info, regcache, regno, all); | |
1faeff08 MR |
5725 | } |
5726 | else | |
5727 | { | |
3aee8918 | 5728 | use_regsets = linux_register_in_regsets (regs_info, regno); |
1faeff08 | 5729 | if (use_regsets) |
3aee8918 PA |
5730 | all = regsets_store_inferior_registers (regs_info->regsets_info, |
5731 | regcache); | |
5732 | if ((!use_regsets || all) && regs_info->usrregs != NULL) | |
5733 | usr_store_inferior_registers (regs_info, regcache, regno, 1); | |
1faeff08 | 5734 | } |
58caa3dc DJ |
5735 | } |
5736 | ||
da6d8c04 | 5737 | |
da6d8c04 DJ |
5738 | /* Copy LEN bytes from inferior's memory starting at MEMADDR |
5739 | to debugger memory starting at MYADDR. */ | |
5740 | ||
c3e735a6 | 5741 | static int |
f450004a | 5742 | linux_read_memory (CORE_ADDR memaddr, unsigned char *myaddr, int len) |
da6d8c04 | 5743 | { |
0bfdf32f | 5744 | int pid = lwpid_of (current_thread); |
ae3e2ccf SM |
5745 | PTRACE_XFER_TYPE *buffer; |
5746 | CORE_ADDR addr; | |
5747 | int count; | |
4934b29e | 5748 | char filename[64]; |
ae3e2ccf | 5749 | int i; |
4934b29e | 5750 | int ret; |
fd462a61 | 5751 | int fd; |
fd462a61 DJ |
5752 | |
5753 | /* Try using /proc. Don't bother for one word. */ | |
5754 | if (len >= 3 * sizeof (long)) | |
5755 | { | |
4934b29e MR |
5756 | int bytes; |
5757 | ||
fd462a61 DJ |
5758 | /* We could keep this file open and cache it - possibly one per |
5759 | thread. That requires some juggling, but is even faster. */ | |
95954743 | 5760 | sprintf (filename, "/proc/%d/mem", pid); |
fd462a61 DJ |
5761 | fd = open (filename, O_RDONLY | O_LARGEFILE); |
5762 | if (fd == -1) | |
5763 | goto no_proc; | |
5764 | ||
5765 | /* If pread64 is available, use it. It's faster if the kernel | |
5766 | supports it (only one syscall), and it's 64-bit safe even on | |
5767 | 32-bit platforms (for instance, SPARC debugging a SPARC64 | |
5768 | application). */ | |
5769 | #ifdef HAVE_PREAD64 | |
4934b29e | 5770 | bytes = pread64 (fd, myaddr, len, memaddr); |
fd462a61 | 5771 | #else |
4934b29e MR |
5772 | bytes = -1; |
5773 | if (lseek (fd, memaddr, SEEK_SET) != -1) | |
5774 | bytes = read (fd, myaddr, len); | |
fd462a61 | 5775 | #endif |
fd462a61 DJ |
5776 | |
5777 | close (fd); | |
4934b29e MR |
5778 | if (bytes == len) |
5779 | return 0; | |
5780 | ||
5781 | /* Some data was read, we'll try to get the rest with ptrace. */ | |
5782 | if (bytes > 0) | |
5783 | { | |
5784 | memaddr += bytes; | |
5785 | myaddr += bytes; | |
5786 | len -= bytes; | |
5787 | } | |
fd462a61 | 5788 | } |
da6d8c04 | 5789 | |
fd462a61 | 5790 | no_proc: |
4934b29e MR |
5791 | /* Round starting address down to longword boundary. */ |
5792 | addr = memaddr & -(CORE_ADDR) sizeof (PTRACE_XFER_TYPE); | |
5793 | /* Round ending address up; get number of longwords that makes. */ | |
5794 | count = ((((memaddr + len) - addr) + sizeof (PTRACE_XFER_TYPE) - 1) | |
5795 | / sizeof (PTRACE_XFER_TYPE)); | |
5796 | /* Allocate buffer of that many longwords. */ | |
8d749320 | 5797 | buffer = XALLOCAVEC (PTRACE_XFER_TYPE, count); |
4934b29e | 5798 | |
da6d8c04 | 5799 | /* Read all the longwords */ |
4934b29e | 5800 | errno = 0; |
da6d8c04 DJ |
5801 | for (i = 0; i < count; i++, addr += sizeof (PTRACE_XFER_TYPE)) |
5802 | { | |
14ce3065 DE |
5803 | /* Coerce the 3rd arg to a uintptr_t first to avoid potential gcc warning |
5804 | about coercing an 8 byte integer to a 4 byte pointer. */ | |
5805 | buffer[i] = ptrace (PTRACE_PEEKTEXT, pid, | |
b8e1b30e LM |
5806 | (PTRACE_TYPE_ARG3) (uintptr_t) addr, |
5807 | (PTRACE_TYPE_ARG4) 0); | |
c3e735a6 | 5808 | if (errno) |
4934b29e | 5809 | break; |
da6d8c04 | 5810 | } |
4934b29e | 5811 | ret = errno; |
da6d8c04 DJ |
5812 | |
5813 | /* Copy appropriate bytes out of the buffer. */ | |
8d409d16 MR |
5814 | if (i > 0) |
5815 | { | |
5816 | i *= sizeof (PTRACE_XFER_TYPE); | |
5817 | i -= memaddr & (sizeof (PTRACE_XFER_TYPE) - 1); | |
5818 | memcpy (myaddr, | |
5819 | (char *) buffer + (memaddr & (sizeof (PTRACE_XFER_TYPE) - 1)), | |
5820 | i < len ? i : len); | |
5821 | } | |
c3e735a6 | 5822 | |
4934b29e | 5823 | return ret; |
da6d8c04 DJ |
5824 | } |
5825 | ||
93ae6fdc PA |
5826 | /* Copy LEN bytes of data from debugger memory at MYADDR to inferior's |
5827 | memory at MEMADDR. On failure (cannot write to the inferior) | |
f0ae6fc3 | 5828 | returns the value of errno. Always succeeds if LEN is zero. */ |
da6d8c04 | 5829 | |
ce3a066d | 5830 | static int |
f450004a | 5831 | linux_write_memory (CORE_ADDR memaddr, const unsigned char *myaddr, int len) |
da6d8c04 | 5832 | { |
ae3e2ccf | 5833 | int i; |
da6d8c04 | 5834 | /* Round starting address down to longword boundary. */ |
ae3e2ccf | 5835 | CORE_ADDR addr = memaddr & -(CORE_ADDR) sizeof (PTRACE_XFER_TYPE); |
da6d8c04 | 5836 | /* Round ending address up; get number of longwords that makes. */ |
ae3e2ccf | 5837 | int count |
493e2a69 MS |
5838 | = (((memaddr + len) - addr) + sizeof (PTRACE_XFER_TYPE) - 1) |
5839 | / sizeof (PTRACE_XFER_TYPE); | |
5840 | ||
da6d8c04 | 5841 | /* Allocate buffer of that many longwords. */ |
ae3e2ccf | 5842 | PTRACE_XFER_TYPE *buffer = XALLOCAVEC (PTRACE_XFER_TYPE, count); |
493e2a69 | 5843 | |
0bfdf32f | 5844 | int pid = lwpid_of (current_thread); |
da6d8c04 | 5845 | |
f0ae6fc3 PA |
5846 | if (len == 0) |
5847 | { | |
5848 | /* Zero length write always succeeds. */ | |
5849 | return 0; | |
5850 | } | |
5851 | ||
0d62e5e8 DJ |
5852 | if (debug_threads) |
5853 | { | |
58d6951d | 5854 | /* Dump up to four bytes. */ |
bf47e248 PA |
5855 | char str[4 * 2 + 1]; |
5856 | char *p = str; | |
5857 | int dump = len < 4 ? len : 4; | |
5858 | ||
5859 | for (i = 0; i < dump; i++) | |
5860 | { | |
5861 | sprintf (p, "%02x", myaddr[i]); | |
5862 | p += 2; | |
5863 | } | |
5864 | *p = '\0'; | |
5865 | ||
5866 | debug_printf ("Writing %s to 0x%08lx in process %d\n", | |
5867 | str, (long) memaddr, pid); | |
0d62e5e8 DJ |
5868 | } |
5869 | ||
da6d8c04 DJ |
5870 | /* Fill start and end extra bytes of buffer with existing memory data. */ |
5871 | ||
93ae6fdc | 5872 | errno = 0; |
14ce3065 DE |
5873 | /* Coerce the 3rd arg to a uintptr_t first to avoid potential gcc warning |
5874 | about coercing an 8 byte integer to a 4 byte pointer. */ | |
5875 | buffer[0] = ptrace (PTRACE_PEEKTEXT, pid, | |
b8e1b30e LM |
5876 | (PTRACE_TYPE_ARG3) (uintptr_t) addr, |
5877 | (PTRACE_TYPE_ARG4) 0); | |
93ae6fdc PA |
5878 | if (errno) |
5879 | return errno; | |
da6d8c04 DJ |
5880 | |
5881 | if (count > 1) | |
5882 | { | |
93ae6fdc | 5883 | errno = 0; |
da6d8c04 | 5884 | buffer[count - 1] |
95954743 | 5885 | = ptrace (PTRACE_PEEKTEXT, pid, |
14ce3065 DE |
5886 | /* Coerce to a uintptr_t first to avoid potential gcc warning |
5887 | about coercing an 8 byte integer to a 4 byte pointer. */ | |
b8e1b30e | 5888 | (PTRACE_TYPE_ARG3) (uintptr_t) (addr + (count - 1) |
14ce3065 | 5889 | * sizeof (PTRACE_XFER_TYPE)), |
b8e1b30e | 5890 | (PTRACE_TYPE_ARG4) 0); |
93ae6fdc PA |
5891 | if (errno) |
5892 | return errno; | |
da6d8c04 DJ |
5893 | } |
5894 | ||
93ae6fdc | 5895 | /* Copy data to be written over corresponding part of buffer. */ |
da6d8c04 | 5896 | |
493e2a69 MS |
5897 | memcpy ((char *) buffer + (memaddr & (sizeof (PTRACE_XFER_TYPE) - 1)), |
5898 | myaddr, len); | |
da6d8c04 DJ |
5899 | |
5900 | /* Write the entire buffer. */ | |
5901 | ||
5902 | for (i = 0; i < count; i++, addr += sizeof (PTRACE_XFER_TYPE)) | |
5903 | { | |
5904 | errno = 0; | |
14ce3065 DE |
5905 | ptrace (PTRACE_POKETEXT, pid, |
5906 | /* Coerce to a uintptr_t first to avoid potential gcc warning | |
5907 | about coercing an 8 byte integer to a 4 byte pointer. */ | |
b8e1b30e LM |
5908 | (PTRACE_TYPE_ARG3) (uintptr_t) addr, |
5909 | (PTRACE_TYPE_ARG4) buffer[i]); | |
da6d8c04 DJ |
5910 | if (errno) |
5911 | return errno; | |
5912 | } | |
5913 | ||
5914 | return 0; | |
5915 | } | |
2f2893d9 DJ |
5916 | |
5917 | static void | |
5918 | linux_look_up_symbols (void) | |
5919 | { | |
0d62e5e8 | 5920 | #ifdef USE_THREAD_DB |
95954743 PA |
5921 | struct process_info *proc = current_process (); |
5922 | ||
fe978cb0 | 5923 | if (proc->priv->thread_db != NULL) |
0d62e5e8 DJ |
5924 | return; |
5925 | ||
9b4c5f87 | 5926 | thread_db_init (); |
0d62e5e8 DJ |
5927 | #endif |
5928 | } | |
5929 | ||
e5379b03 | 5930 | static void |
ef57601b | 5931 | linux_request_interrupt (void) |
e5379b03 | 5932 | { |
78708b7c PA |
5933 | /* Send a SIGINT to the process group. This acts just like the user |
5934 | typed a ^C on the controlling terminal. */ | |
5935 | kill (-signal_pid, SIGINT); | |
e5379b03 DJ |
5936 | } |
5937 | ||
aa691b87 RM |
5938 | /* Copy LEN bytes from inferior's auxiliary vector starting at OFFSET |
5939 | to debugger memory starting at MYADDR. */ | |
5940 | ||
5941 | static int | |
f450004a | 5942 | linux_read_auxv (CORE_ADDR offset, unsigned char *myaddr, unsigned int len) |
aa691b87 RM |
5943 | { |
5944 | char filename[PATH_MAX]; | |
5945 | int fd, n; | |
0bfdf32f | 5946 | int pid = lwpid_of (current_thread); |
aa691b87 | 5947 | |
6cebaf6e | 5948 | xsnprintf (filename, sizeof filename, "/proc/%d/auxv", pid); |
aa691b87 RM |
5949 | |
5950 | fd = open (filename, O_RDONLY); | |
5951 | if (fd < 0) | |
5952 | return -1; | |
5953 | ||
5954 | if (offset != (CORE_ADDR) 0 | |
5955 | && lseek (fd, (off_t) offset, SEEK_SET) != (off_t) offset) | |
5956 | n = -1; | |
5957 | else | |
5958 | n = read (fd, myaddr, len); | |
5959 | ||
5960 | close (fd); | |
5961 | ||
5962 | return n; | |
5963 | } | |
5964 | ||
d993e290 PA |
5965 | /* These breakpoint and watchpoint related wrapper functions simply |
5966 | pass on the function call if the target has registered a | |
5967 | corresponding function. */ | |
e013ee27 OF |
5968 | |
5969 | static int | |
802e8e6d PA |
5970 | linux_supports_z_point_type (char z_type) |
5971 | { | |
5972 | return (the_low_target.supports_z_point_type != NULL | |
5973 | && the_low_target.supports_z_point_type (z_type)); | |
5974 | } | |
5975 | ||
5976 | static int | |
5977 | linux_insert_point (enum raw_bkpt_type type, CORE_ADDR addr, | |
5978 | int size, struct raw_breakpoint *bp) | |
e013ee27 | 5979 | { |
c8f4bfdd YQ |
5980 | if (type == raw_bkpt_type_sw) |
5981 | return insert_memory_breakpoint (bp); | |
5982 | else if (the_low_target.insert_point != NULL) | |
802e8e6d | 5983 | return the_low_target.insert_point (type, addr, size, bp); |
e013ee27 OF |
5984 | else |
5985 | /* Unsupported (see target.h). */ | |
5986 | return 1; | |
5987 | } | |
5988 | ||
5989 | static int | |
802e8e6d PA |
5990 | linux_remove_point (enum raw_bkpt_type type, CORE_ADDR addr, |
5991 | int size, struct raw_breakpoint *bp) | |
e013ee27 | 5992 | { |
c8f4bfdd YQ |
5993 | if (type == raw_bkpt_type_sw) |
5994 | return remove_memory_breakpoint (bp); | |
5995 | else if (the_low_target.remove_point != NULL) | |
802e8e6d | 5996 | return the_low_target.remove_point (type, addr, size, bp); |
e013ee27 OF |
5997 | else |
5998 | /* Unsupported (see target.h). */ | |
5999 | return 1; | |
6000 | } | |
6001 | ||
3e572f71 PA |
6002 | /* Implement the to_stopped_by_sw_breakpoint target_ops |
6003 | method. */ | |
6004 | ||
6005 | static int | |
6006 | linux_stopped_by_sw_breakpoint (void) | |
6007 | { | |
6008 | struct lwp_info *lwp = get_thread_lwp (current_thread); | |
6009 | ||
6010 | return (lwp->stop_reason == TARGET_STOPPED_BY_SW_BREAKPOINT); | |
6011 | } | |
6012 | ||
6013 | /* Implement the to_supports_stopped_by_sw_breakpoint target_ops | |
6014 | method. */ | |
6015 | ||
6016 | static int | |
6017 | linux_supports_stopped_by_sw_breakpoint (void) | |
6018 | { | |
6019 | return USE_SIGTRAP_SIGINFO; | |
6020 | } | |
6021 | ||
6022 | /* Implement the to_stopped_by_hw_breakpoint target_ops | |
6023 | method. */ | |
6024 | ||
6025 | static int | |
6026 | linux_stopped_by_hw_breakpoint (void) | |
6027 | { | |
6028 | struct lwp_info *lwp = get_thread_lwp (current_thread); | |
6029 | ||
6030 | return (lwp->stop_reason == TARGET_STOPPED_BY_HW_BREAKPOINT); | |
6031 | } | |
6032 | ||
6033 | /* Implement the to_supports_stopped_by_hw_breakpoint target_ops | |
6034 | method. */ | |
6035 | ||
6036 | static int | |
6037 | linux_supports_stopped_by_hw_breakpoint (void) | |
6038 | { | |
6039 | return USE_SIGTRAP_SIGINFO; | |
6040 | } | |
6041 | ||
70b90b91 | 6042 | /* Implement the supports_hardware_single_step target_ops method. */ |
45614f15 YQ |
6043 | |
6044 | static int | |
70b90b91 | 6045 | linux_supports_hardware_single_step (void) |
45614f15 | 6046 | { |
45614f15 YQ |
6047 | return can_hardware_single_step (); |
6048 | } | |
6049 | ||
7d00775e AT |
6050 | static int |
6051 | linux_supports_software_single_step (void) | |
6052 | { | |
6053 | return can_software_single_step (); | |
6054 | } | |
6055 | ||
e013ee27 OF |
6056 | static int |
6057 | linux_stopped_by_watchpoint (void) | |
6058 | { | |
0bfdf32f | 6059 | struct lwp_info *lwp = get_thread_lwp (current_thread); |
c3adc08c | 6060 | |
15c66dd6 | 6061 | return lwp->stop_reason == TARGET_STOPPED_BY_WATCHPOINT; |
e013ee27 OF |
6062 | } |
6063 | ||
6064 | static CORE_ADDR | |
6065 | linux_stopped_data_address (void) | |
6066 | { | |
0bfdf32f | 6067 | struct lwp_info *lwp = get_thread_lwp (current_thread); |
c3adc08c PA |
6068 | |
6069 | return lwp->stopped_data_address; | |
e013ee27 OF |
6070 | } |
6071 | ||
db0dfaa0 LM |
6072 | #if defined(__UCLIBC__) && defined(HAS_NOMMU) \ |
6073 | && defined(PT_TEXT_ADDR) && defined(PT_DATA_ADDR) \ | |
6074 | && defined(PT_TEXT_END_ADDR) | |
6075 | ||
6076 | /* This is only used for targets that define PT_TEXT_ADDR, | |
6077 | PT_DATA_ADDR and PT_TEXT_END_ADDR. If those are not defined, supposedly | |
6078 | the target has different ways of acquiring this information, like | |
6079 | loadmaps. */ | |
52fb6437 NS |
6080 | |
6081 | /* Under uClinux, programs are loaded at non-zero offsets, which we need | |
6082 | to tell gdb about. */ | |
6083 | ||
6084 | static int | |
6085 | linux_read_offsets (CORE_ADDR *text_p, CORE_ADDR *data_p) | |
6086 | { | |
52fb6437 | 6087 | unsigned long text, text_end, data; |
62828379 | 6088 | int pid = lwpid_of (current_thread); |
52fb6437 NS |
6089 | |
6090 | errno = 0; | |
6091 | ||
b8e1b30e LM |
6092 | text = ptrace (PTRACE_PEEKUSER, pid, (PTRACE_TYPE_ARG3) PT_TEXT_ADDR, |
6093 | (PTRACE_TYPE_ARG4) 0); | |
6094 | text_end = ptrace (PTRACE_PEEKUSER, pid, (PTRACE_TYPE_ARG3) PT_TEXT_END_ADDR, | |
6095 | (PTRACE_TYPE_ARG4) 0); | |
6096 | data = ptrace (PTRACE_PEEKUSER, pid, (PTRACE_TYPE_ARG3) PT_DATA_ADDR, | |
6097 | (PTRACE_TYPE_ARG4) 0); | |
52fb6437 NS |
6098 | |
6099 | if (errno == 0) | |
6100 | { | |
6101 | /* Both text and data offsets produced at compile-time (and so | |
1b3f6016 PA |
6102 | used by gdb) are relative to the beginning of the program, |
6103 | with the data segment immediately following the text segment. | |
6104 | However, the actual runtime layout in memory may put the data | |
6105 | somewhere else, so when we send gdb a data base-address, we | |
6106 | use the real data base address and subtract the compile-time | |
6107 | data base-address from it (which is just the length of the | |
6108 | text segment). BSS immediately follows data in both | |
6109 | cases. */ | |
52fb6437 NS |
6110 | *text_p = text; |
6111 | *data_p = data - (text_end - text); | |
1b3f6016 | 6112 | |
52fb6437 NS |
6113 | return 1; |
6114 | } | |
52fb6437 NS |
6115 | return 0; |
6116 | } | |
6117 | #endif | |
6118 | ||
07e059b5 VP |
6119 | static int |
6120 | linux_qxfer_osdata (const char *annex, | |
1b3f6016 PA |
6121 | unsigned char *readbuf, unsigned const char *writebuf, |
6122 | CORE_ADDR offset, int len) | |
07e059b5 | 6123 | { |
d26e3629 | 6124 | return linux_common_xfer_osdata (annex, readbuf, offset, len); |
07e059b5 VP |
6125 | } |
6126 | ||
d0722149 DE |
6127 | /* Convert a native/host siginfo object, into/from the siginfo in the |
6128 | layout of the inferiors' architecture. */ | |
6129 | ||
6130 | static void | |
8adce034 | 6131 | siginfo_fixup (siginfo_t *siginfo, gdb_byte *inf_siginfo, int direction) |
d0722149 DE |
6132 | { |
6133 | int done = 0; | |
6134 | ||
6135 | if (the_low_target.siginfo_fixup != NULL) | |
6136 | done = the_low_target.siginfo_fixup (siginfo, inf_siginfo, direction); | |
6137 | ||
6138 | /* If there was no callback, or the callback didn't do anything, | |
6139 | then just do a straight memcpy. */ | |
6140 | if (!done) | |
6141 | { | |
6142 | if (direction == 1) | |
a5362b9a | 6143 | memcpy (siginfo, inf_siginfo, sizeof (siginfo_t)); |
d0722149 | 6144 | else |
a5362b9a | 6145 | memcpy (inf_siginfo, siginfo, sizeof (siginfo_t)); |
d0722149 DE |
6146 | } |
6147 | } | |
6148 | ||
4aa995e1 PA |
6149 | static int |
6150 | linux_xfer_siginfo (const char *annex, unsigned char *readbuf, | |
6151 | unsigned const char *writebuf, CORE_ADDR offset, int len) | |
6152 | { | |
d0722149 | 6153 | int pid; |
a5362b9a | 6154 | siginfo_t siginfo; |
8adce034 | 6155 | gdb_byte inf_siginfo[sizeof (siginfo_t)]; |
4aa995e1 | 6156 | |
0bfdf32f | 6157 | if (current_thread == NULL) |
4aa995e1 PA |
6158 | return -1; |
6159 | ||
0bfdf32f | 6160 | pid = lwpid_of (current_thread); |
4aa995e1 PA |
6161 | |
6162 | if (debug_threads) | |
87ce2a04 DE |
6163 | debug_printf ("%s siginfo for lwp %d.\n", |
6164 | readbuf != NULL ? "Reading" : "Writing", | |
6165 | pid); | |
4aa995e1 | 6166 | |
0adea5f7 | 6167 | if (offset >= sizeof (siginfo)) |
4aa995e1 PA |
6168 | return -1; |
6169 | ||
b8e1b30e | 6170 | if (ptrace (PTRACE_GETSIGINFO, pid, (PTRACE_TYPE_ARG3) 0, &siginfo) != 0) |
4aa995e1 PA |
6171 | return -1; |
6172 | ||
d0722149 DE |
6173 | /* When GDBSERVER is built as a 64-bit application, ptrace writes into |
6174 | SIGINFO an object with 64-bit layout. Since debugging a 32-bit | |
6175 | inferior with a 64-bit GDBSERVER should look the same as debugging it | |
6176 | with a 32-bit GDBSERVER, we need to convert it. */ | |
6177 | siginfo_fixup (&siginfo, inf_siginfo, 0); | |
6178 | ||
4aa995e1 PA |
6179 | if (offset + len > sizeof (siginfo)) |
6180 | len = sizeof (siginfo) - offset; | |
6181 | ||
6182 | if (readbuf != NULL) | |
d0722149 | 6183 | memcpy (readbuf, inf_siginfo + offset, len); |
4aa995e1 PA |
6184 | else |
6185 | { | |
d0722149 DE |
6186 | memcpy (inf_siginfo + offset, writebuf, len); |
6187 | ||
6188 | /* Convert back to ptrace layout before flushing it out. */ | |
6189 | siginfo_fixup (&siginfo, inf_siginfo, 1); | |
6190 | ||
b8e1b30e | 6191 | if (ptrace (PTRACE_SETSIGINFO, pid, (PTRACE_TYPE_ARG3) 0, &siginfo) != 0) |
4aa995e1 PA |
6192 | return -1; |
6193 | } | |
6194 | ||
6195 | return len; | |
6196 | } | |
6197 | ||
bd99dc85 PA |
6198 | /* SIGCHLD handler that serves two purposes: In non-stop/async mode, |
6199 | so we notice when children change state; as the handler for the | |
6200 | sigsuspend in my_waitpid. */ | |
6201 | ||
6202 | static void | |
6203 | sigchld_handler (int signo) | |
6204 | { | |
6205 | int old_errno = errno; | |
6206 | ||
6207 | if (debug_threads) | |
e581f2b4 PA |
6208 | { |
6209 | do | |
6210 | { | |
6211 | /* fprintf is not async-signal-safe, so call write | |
6212 | directly. */ | |
6213 | if (write (2, "sigchld_handler\n", | |
6214 | sizeof ("sigchld_handler\n") - 1) < 0) | |
6215 | break; /* just ignore */ | |
6216 | } while (0); | |
6217 | } | |
bd99dc85 PA |
6218 | |
6219 | if (target_is_async_p ()) | |
6220 | async_file_mark (); /* trigger a linux_wait */ | |
6221 | ||
6222 | errno = old_errno; | |
6223 | } | |
6224 | ||
6225 | static int | |
6226 | linux_supports_non_stop (void) | |
6227 | { | |
6228 | return 1; | |
6229 | } | |
6230 | ||
6231 | static int | |
6232 | linux_async (int enable) | |
6233 | { | |
7089dca4 | 6234 | int previous = target_is_async_p (); |
bd99dc85 | 6235 | |
8336d594 | 6236 | if (debug_threads) |
87ce2a04 DE |
6237 | debug_printf ("linux_async (%d), previous=%d\n", |
6238 | enable, previous); | |
8336d594 | 6239 | |
bd99dc85 PA |
6240 | if (previous != enable) |
6241 | { | |
6242 | sigset_t mask; | |
6243 | sigemptyset (&mask); | |
6244 | sigaddset (&mask, SIGCHLD); | |
6245 | ||
6246 | sigprocmask (SIG_BLOCK, &mask, NULL); | |
6247 | ||
6248 | if (enable) | |
6249 | { | |
6250 | if (pipe (linux_event_pipe) == -1) | |
aa96c426 GB |
6251 | { |
6252 | linux_event_pipe[0] = -1; | |
6253 | linux_event_pipe[1] = -1; | |
6254 | sigprocmask (SIG_UNBLOCK, &mask, NULL); | |
6255 | ||
6256 | warning ("creating event pipe failed."); | |
6257 | return previous; | |
6258 | } | |
bd99dc85 PA |
6259 | |
6260 | fcntl (linux_event_pipe[0], F_SETFL, O_NONBLOCK); | |
6261 | fcntl (linux_event_pipe[1], F_SETFL, O_NONBLOCK); | |
6262 | ||
6263 | /* Register the event loop handler. */ | |
6264 | add_file_handler (linux_event_pipe[0], | |
6265 | handle_target_event, NULL); | |
6266 | ||
6267 | /* Always trigger a linux_wait. */ | |
6268 | async_file_mark (); | |
6269 | } | |
6270 | else | |
6271 | { | |
6272 | delete_file_handler (linux_event_pipe[0]); | |
6273 | ||
6274 | close (linux_event_pipe[0]); | |
6275 | close (linux_event_pipe[1]); | |
6276 | linux_event_pipe[0] = -1; | |
6277 | linux_event_pipe[1] = -1; | |
6278 | } | |
6279 | ||
6280 | sigprocmask (SIG_UNBLOCK, &mask, NULL); | |
6281 | } | |
6282 | ||
6283 | return previous; | |
6284 | } | |
6285 | ||
6286 | static int | |
6287 | linux_start_non_stop (int nonstop) | |
6288 | { | |
6289 | /* Register or unregister from event-loop accordingly. */ | |
6290 | linux_async (nonstop); | |
aa96c426 GB |
6291 | |
6292 | if (target_is_async_p () != (nonstop != 0)) | |
6293 | return -1; | |
6294 | ||
bd99dc85 PA |
6295 | return 0; |
6296 | } | |
6297 | ||
cf8fd78b PA |
6298 | static int |
6299 | linux_supports_multi_process (void) | |
6300 | { | |
6301 | return 1; | |
6302 | } | |
6303 | ||
89245bc0 DB |
6304 | /* Check if fork events are supported. */ |
6305 | ||
6306 | static int | |
6307 | linux_supports_fork_events (void) | |
6308 | { | |
6309 | return linux_supports_tracefork (); | |
6310 | } | |
6311 | ||
6312 | /* Check if vfork events are supported. */ | |
6313 | ||
6314 | static int | |
6315 | linux_supports_vfork_events (void) | |
6316 | { | |
6317 | return linux_supports_tracefork (); | |
6318 | } | |
6319 | ||
94585166 DB |
6320 | /* Check if exec events are supported. */ |
6321 | ||
6322 | static int | |
6323 | linux_supports_exec_events (void) | |
6324 | { | |
6325 | return linux_supports_traceexec (); | |
6326 | } | |
6327 | ||
de0d863e DB |
6328 | /* Target hook for 'handle_new_gdb_connection'. Causes a reset of the |
6329 | ptrace flags for all inferiors. This is in case the new GDB connection | |
6330 | doesn't support the same set of events that the previous one did. */ | |
6331 | ||
6332 | static void | |
6333 | linux_handle_new_gdb_connection (void) | |
6334 | { | |
de0d863e | 6335 | /* Request that all the lwps reset their ptrace options. */ |
bbf550d5 SM |
6336 | for_each_thread ([] (thread_info *thread) |
6337 | { | |
6338 | struct lwp_info *lwp = get_thread_lwp (thread); | |
6339 | ||
6340 | if (!lwp->stopped) | |
6341 | { | |
6342 | /* Stop the lwp so we can modify its ptrace options. */ | |
6343 | lwp->must_set_ptrace_flags = 1; | |
6344 | linux_stop_lwp (lwp); | |
6345 | } | |
6346 | else | |
6347 | { | |
6348 | /* Already stopped; go ahead and set the ptrace options. */ | |
6349 | struct process_info *proc = find_process_pid (pid_of (thread)); | |
6350 | int options = linux_low_ptrace_options (proc->attached); | |
6351 | ||
6352 | linux_enable_event_reporting (lwpid_of (thread), options); | |
6353 | lwp->must_set_ptrace_flags = 0; | |
6354 | } | |
6355 | }); | |
de0d863e DB |
6356 | } |
6357 | ||
03583c20 UW |
6358 | static int |
6359 | linux_supports_disable_randomization (void) | |
6360 | { | |
6361 | #ifdef HAVE_PERSONALITY | |
6362 | return 1; | |
6363 | #else | |
6364 | return 0; | |
6365 | #endif | |
6366 | } | |
efcbbd14 | 6367 | |
d1feda86 YQ |
6368 | static int |
6369 | linux_supports_agent (void) | |
6370 | { | |
6371 | return 1; | |
6372 | } | |
6373 | ||
c2d6af84 PA |
6374 | static int |
6375 | linux_supports_range_stepping (void) | |
6376 | { | |
c3805894 YQ |
6377 | if (can_software_single_step ()) |
6378 | return 1; | |
c2d6af84 PA |
6379 | if (*the_low_target.supports_range_stepping == NULL) |
6380 | return 0; | |
6381 | ||
6382 | return (*the_low_target.supports_range_stepping) (); | |
6383 | } | |
6384 | ||
efcbbd14 UW |
6385 | /* Enumerate spufs IDs for process PID. */ |
6386 | static int | |
6387 | spu_enumerate_spu_ids (long pid, unsigned char *buf, CORE_ADDR offset, int len) | |
6388 | { | |
6389 | int pos = 0; | |
6390 | int written = 0; | |
6391 | char path[128]; | |
6392 | DIR *dir; | |
6393 | struct dirent *entry; | |
6394 | ||
6395 | sprintf (path, "/proc/%ld/fd", pid); | |
6396 | dir = opendir (path); | |
6397 | if (!dir) | |
6398 | return -1; | |
6399 | ||
6400 | rewinddir (dir); | |
6401 | while ((entry = readdir (dir)) != NULL) | |
6402 | { | |
6403 | struct stat st; | |
6404 | struct statfs stfs; | |
6405 | int fd; | |
6406 | ||
6407 | fd = atoi (entry->d_name); | |
6408 | if (!fd) | |
6409 | continue; | |
6410 | ||
6411 | sprintf (path, "/proc/%ld/fd/%d", pid, fd); | |
6412 | if (stat (path, &st) != 0) | |
6413 | continue; | |
6414 | if (!S_ISDIR (st.st_mode)) | |
6415 | continue; | |
6416 | ||
6417 | if (statfs (path, &stfs) != 0) | |
6418 | continue; | |
6419 | if (stfs.f_type != SPUFS_MAGIC) | |
6420 | continue; | |
6421 | ||
6422 | if (pos >= offset && pos + 4 <= offset + len) | |
6423 | { | |
6424 | *(unsigned int *)(buf + pos - offset) = fd; | |
6425 | written += 4; | |
6426 | } | |
6427 | pos += 4; | |
6428 | } | |
6429 | ||
6430 | closedir (dir); | |
6431 | return written; | |
6432 | } | |
6433 | ||
6434 | /* Implements the to_xfer_partial interface for the TARGET_OBJECT_SPU | |
6435 | object type, using the /proc file system. */ | |
6436 | static int | |
6437 | linux_qxfer_spu (const char *annex, unsigned char *readbuf, | |
6438 | unsigned const char *writebuf, | |
6439 | CORE_ADDR offset, int len) | |
6440 | { | |
0bfdf32f | 6441 | long pid = lwpid_of (current_thread); |
efcbbd14 UW |
6442 | char buf[128]; |
6443 | int fd = 0; | |
6444 | int ret = 0; | |
6445 | ||
6446 | if (!writebuf && !readbuf) | |
6447 | return -1; | |
6448 | ||
6449 | if (!*annex) | |
6450 | { | |
6451 | if (!readbuf) | |
6452 | return -1; | |
6453 | else | |
6454 | return spu_enumerate_spu_ids (pid, readbuf, offset, len); | |
6455 | } | |
6456 | ||
6457 | sprintf (buf, "/proc/%ld/fd/%s", pid, annex); | |
6458 | fd = open (buf, writebuf? O_WRONLY : O_RDONLY); | |
6459 | if (fd <= 0) | |
6460 | return -1; | |
6461 | ||
6462 | if (offset != 0 | |
6463 | && lseek (fd, (off_t) offset, SEEK_SET) != (off_t) offset) | |
6464 | { | |
6465 | close (fd); | |
6466 | return 0; | |
6467 | } | |
6468 | ||
6469 | if (writebuf) | |
6470 | ret = write (fd, writebuf, (size_t) len); | |
6471 | else | |
6472 | ret = read (fd, readbuf, (size_t) len); | |
6473 | ||
6474 | close (fd); | |
6475 | return ret; | |
6476 | } | |
6477 | ||
723b724b | 6478 | #if defined PT_GETDSBT || defined PTRACE_GETFDPIC |
78d85199 YQ |
6479 | struct target_loadseg |
6480 | { | |
6481 | /* Core address to which the segment is mapped. */ | |
6482 | Elf32_Addr addr; | |
6483 | /* VMA recorded in the program header. */ | |
6484 | Elf32_Addr p_vaddr; | |
6485 | /* Size of this segment in memory. */ | |
6486 | Elf32_Word p_memsz; | |
6487 | }; | |
6488 | ||
723b724b | 6489 | # if defined PT_GETDSBT |
78d85199 YQ |
6490 | struct target_loadmap |
6491 | { | |
6492 | /* Protocol version number, must be zero. */ | |
6493 | Elf32_Word version; | |
6494 | /* Pointer to the DSBT table, its size, and the DSBT index. */ | |
6495 | unsigned *dsbt_table; | |
6496 | unsigned dsbt_size, dsbt_index; | |
6497 | /* Number of segments in this map. */ | |
6498 | Elf32_Word nsegs; | |
6499 | /* The actual memory map. */ | |
6500 | struct target_loadseg segs[/*nsegs*/]; | |
6501 | }; | |
723b724b MF |
6502 | # define LINUX_LOADMAP PT_GETDSBT |
6503 | # define LINUX_LOADMAP_EXEC PTRACE_GETDSBT_EXEC | |
6504 | # define LINUX_LOADMAP_INTERP PTRACE_GETDSBT_INTERP | |
6505 | # else | |
6506 | struct target_loadmap | |
6507 | { | |
6508 | /* Protocol version number, must be zero. */ | |
6509 | Elf32_Half version; | |
6510 | /* Number of segments in this map. */ | |
6511 | Elf32_Half nsegs; | |
6512 | /* The actual memory map. */ | |
6513 | struct target_loadseg segs[/*nsegs*/]; | |
6514 | }; | |
6515 | # define LINUX_LOADMAP PTRACE_GETFDPIC | |
6516 | # define LINUX_LOADMAP_EXEC PTRACE_GETFDPIC_EXEC | |
6517 | # define LINUX_LOADMAP_INTERP PTRACE_GETFDPIC_INTERP | |
6518 | # endif | |
78d85199 | 6519 | |
78d85199 YQ |
6520 | static int |
6521 | linux_read_loadmap (const char *annex, CORE_ADDR offset, | |
6522 | unsigned char *myaddr, unsigned int len) | |
6523 | { | |
0bfdf32f | 6524 | int pid = lwpid_of (current_thread); |
78d85199 YQ |
6525 | int addr = -1; |
6526 | struct target_loadmap *data = NULL; | |
6527 | unsigned int actual_length, copy_length; | |
6528 | ||
6529 | if (strcmp (annex, "exec") == 0) | |
723b724b | 6530 | addr = (int) LINUX_LOADMAP_EXEC; |
78d85199 | 6531 | else if (strcmp (annex, "interp") == 0) |
723b724b | 6532 | addr = (int) LINUX_LOADMAP_INTERP; |
78d85199 YQ |
6533 | else |
6534 | return -1; | |
6535 | ||
723b724b | 6536 | if (ptrace (LINUX_LOADMAP, pid, addr, &data) != 0) |
78d85199 YQ |
6537 | return -1; |
6538 | ||
6539 | if (data == NULL) | |
6540 | return -1; | |
6541 | ||
6542 | actual_length = sizeof (struct target_loadmap) | |
6543 | + sizeof (struct target_loadseg) * data->nsegs; | |
6544 | ||
6545 | if (offset < 0 || offset > actual_length) | |
6546 | return -1; | |
6547 | ||
6548 | copy_length = actual_length - offset < len ? actual_length - offset : len; | |
6549 | memcpy (myaddr, (char *) data + offset, copy_length); | |
6550 | return copy_length; | |
6551 | } | |
723b724b MF |
6552 | #else |
6553 | # define linux_read_loadmap NULL | |
6554 | #endif /* defined PT_GETDSBT || defined PTRACE_GETFDPIC */ | |
78d85199 | 6555 | |
1570b33e | 6556 | static void |
06e03fff | 6557 | linux_process_qsupported (char **features, int count) |
1570b33e L |
6558 | { |
6559 | if (the_low_target.process_qsupported != NULL) | |
06e03fff | 6560 | the_low_target.process_qsupported (features, count); |
1570b33e L |
6561 | } |
6562 | ||
82075af2 JS |
6563 | static int |
6564 | linux_supports_catch_syscall (void) | |
6565 | { | |
6566 | return (the_low_target.get_syscall_trapinfo != NULL | |
6567 | && linux_supports_tracesysgood ()); | |
6568 | } | |
6569 | ||
ae91f625 MK |
6570 | static int |
6571 | linux_get_ipa_tdesc_idx (void) | |
6572 | { | |
6573 | if (the_low_target.get_ipa_tdesc_idx == NULL) | |
6574 | return 0; | |
6575 | ||
6576 | return (*the_low_target.get_ipa_tdesc_idx) (); | |
6577 | } | |
6578 | ||
219f2f23 PA |
6579 | static int |
6580 | linux_supports_tracepoints (void) | |
6581 | { | |
6582 | if (*the_low_target.supports_tracepoints == NULL) | |
6583 | return 0; | |
6584 | ||
6585 | return (*the_low_target.supports_tracepoints) (); | |
6586 | } | |
6587 | ||
6588 | static CORE_ADDR | |
6589 | linux_read_pc (struct regcache *regcache) | |
6590 | { | |
6591 | if (the_low_target.get_pc == NULL) | |
6592 | return 0; | |
6593 | ||
6594 | return (*the_low_target.get_pc) (regcache); | |
6595 | } | |
6596 | ||
6597 | static void | |
6598 | linux_write_pc (struct regcache *regcache, CORE_ADDR pc) | |
6599 | { | |
6600 | gdb_assert (the_low_target.set_pc != NULL); | |
6601 | ||
6602 | (*the_low_target.set_pc) (regcache, pc); | |
6603 | } | |
6604 | ||
8336d594 PA |
6605 | static int |
6606 | linux_thread_stopped (struct thread_info *thread) | |
6607 | { | |
6608 | return get_thread_lwp (thread)->stopped; | |
6609 | } | |
6610 | ||
6611 | /* This exposes stop-all-threads functionality to other modules. */ | |
6612 | ||
6613 | static void | |
7984d532 | 6614 | linux_pause_all (int freeze) |
8336d594 | 6615 | { |
7984d532 PA |
6616 | stop_all_lwps (freeze, NULL); |
6617 | } | |
6618 | ||
6619 | /* This exposes unstop-all-threads functionality to other gdbserver | |
6620 | modules. */ | |
6621 | ||
6622 | static void | |
6623 | linux_unpause_all (int unfreeze) | |
6624 | { | |
6625 | unstop_all_lwps (unfreeze, NULL); | |
8336d594 PA |
6626 | } |
6627 | ||
90d74c30 PA |
6628 | static int |
6629 | linux_prepare_to_access_memory (void) | |
6630 | { | |
6631 | /* Neither ptrace nor /proc/PID/mem allow accessing memory through a | |
6632 | running LWP. */ | |
6633 | if (non_stop) | |
6634 | linux_pause_all (1); | |
6635 | return 0; | |
6636 | } | |
6637 | ||
6638 | static void | |
0146f85b | 6639 | linux_done_accessing_memory (void) |
90d74c30 PA |
6640 | { |
6641 | /* Neither ptrace nor /proc/PID/mem allow accessing memory through a | |
6642 | running LWP. */ | |
6643 | if (non_stop) | |
6644 | linux_unpause_all (1); | |
6645 | } | |
6646 | ||
fa593d66 PA |
6647 | static int |
6648 | linux_install_fast_tracepoint_jump_pad (CORE_ADDR tpoint, CORE_ADDR tpaddr, | |
6649 | CORE_ADDR collector, | |
6650 | CORE_ADDR lockaddr, | |
6651 | ULONGEST orig_size, | |
6652 | CORE_ADDR *jump_entry, | |
405f8e94 SS |
6653 | CORE_ADDR *trampoline, |
6654 | ULONGEST *trampoline_size, | |
fa593d66 PA |
6655 | unsigned char *jjump_pad_insn, |
6656 | ULONGEST *jjump_pad_insn_size, | |
6657 | CORE_ADDR *adjusted_insn_addr, | |
405f8e94 SS |
6658 | CORE_ADDR *adjusted_insn_addr_end, |
6659 | char *err) | |
fa593d66 PA |
6660 | { |
6661 | return (*the_low_target.install_fast_tracepoint_jump_pad) | |
6662 | (tpoint, tpaddr, collector, lockaddr, orig_size, | |
405f8e94 SS |
6663 | jump_entry, trampoline, trampoline_size, |
6664 | jjump_pad_insn, jjump_pad_insn_size, | |
6665 | adjusted_insn_addr, adjusted_insn_addr_end, | |
6666 | err); | |
fa593d66 PA |
6667 | } |
6668 | ||
6a271cae PA |
6669 | static struct emit_ops * |
6670 | linux_emit_ops (void) | |
6671 | { | |
6672 | if (the_low_target.emit_ops != NULL) | |
6673 | return (*the_low_target.emit_ops) (); | |
6674 | else | |
6675 | return NULL; | |
6676 | } | |
6677 | ||
405f8e94 SS |
6678 | static int |
6679 | linux_get_min_fast_tracepoint_insn_len (void) | |
6680 | { | |
6681 | return (*the_low_target.get_min_fast_tracepoint_insn_len) (); | |
6682 | } | |
6683 | ||
2268b414 JK |
6684 | /* Extract &phdr and num_phdr in the inferior. Return 0 on success. */ |
6685 | ||
6686 | static int | |
6687 | get_phdr_phnum_from_proc_auxv (const int pid, const int is_elf64, | |
6688 | CORE_ADDR *phdr_memaddr, int *num_phdr) | |
6689 | { | |
6690 | char filename[PATH_MAX]; | |
6691 | int fd; | |
6692 | const int auxv_size = is_elf64 | |
6693 | ? sizeof (Elf64_auxv_t) : sizeof (Elf32_auxv_t); | |
6694 | char buf[sizeof (Elf64_auxv_t)]; /* The larger of the two. */ | |
6695 | ||
6696 | xsnprintf (filename, sizeof filename, "/proc/%d/auxv", pid); | |
6697 | ||
6698 | fd = open (filename, O_RDONLY); | |
6699 | if (fd < 0) | |
6700 | return 1; | |
6701 | ||
6702 | *phdr_memaddr = 0; | |
6703 | *num_phdr = 0; | |
6704 | while (read (fd, buf, auxv_size) == auxv_size | |
6705 | && (*phdr_memaddr == 0 || *num_phdr == 0)) | |
6706 | { | |
6707 | if (is_elf64) | |
6708 | { | |
6709 | Elf64_auxv_t *const aux = (Elf64_auxv_t *) buf; | |
6710 | ||
6711 | switch (aux->a_type) | |
6712 | { | |
6713 | case AT_PHDR: | |
6714 | *phdr_memaddr = aux->a_un.a_val; | |
6715 | break; | |
6716 | case AT_PHNUM: | |
6717 | *num_phdr = aux->a_un.a_val; | |
6718 | break; | |
6719 | } | |
6720 | } | |
6721 | else | |
6722 | { | |
6723 | Elf32_auxv_t *const aux = (Elf32_auxv_t *) buf; | |
6724 | ||
6725 | switch (aux->a_type) | |
6726 | { | |
6727 | case AT_PHDR: | |
6728 | *phdr_memaddr = aux->a_un.a_val; | |
6729 | break; | |
6730 | case AT_PHNUM: | |
6731 | *num_phdr = aux->a_un.a_val; | |
6732 | break; | |
6733 | } | |
6734 | } | |
6735 | } | |
6736 | ||
6737 | close (fd); | |
6738 | ||
6739 | if (*phdr_memaddr == 0 || *num_phdr == 0) | |
6740 | { | |
6741 | warning ("Unexpected missing AT_PHDR and/or AT_PHNUM: " | |
6742 | "phdr_memaddr = %ld, phdr_num = %d", | |
6743 | (long) *phdr_memaddr, *num_phdr); | |
6744 | return 2; | |
6745 | } | |
6746 | ||
6747 | return 0; | |
6748 | } | |
6749 | ||
6750 | /* Return &_DYNAMIC (via PT_DYNAMIC) in the inferior, or 0 if not present. */ | |
6751 | ||
6752 | static CORE_ADDR | |
6753 | get_dynamic (const int pid, const int is_elf64) | |
6754 | { | |
6755 | CORE_ADDR phdr_memaddr, relocation; | |
db1ff28b | 6756 | int num_phdr, i; |
2268b414 | 6757 | unsigned char *phdr_buf; |
db1ff28b | 6758 | const int phdr_size = is_elf64 ? sizeof (Elf64_Phdr) : sizeof (Elf32_Phdr); |
2268b414 JK |
6759 | |
6760 | if (get_phdr_phnum_from_proc_auxv (pid, is_elf64, &phdr_memaddr, &num_phdr)) | |
6761 | return 0; | |
6762 | ||
6763 | gdb_assert (num_phdr < 100); /* Basic sanity check. */ | |
224c3ddb | 6764 | phdr_buf = (unsigned char *) alloca (num_phdr * phdr_size); |
2268b414 JK |
6765 | |
6766 | if (linux_read_memory (phdr_memaddr, phdr_buf, num_phdr * phdr_size)) | |
6767 | return 0; | |
6768 | ||
6769 | /* Compute relocation: it is expected to be 0 for "regular" executables, | |
6770 | non-zero for PIE ones. */ | |
6771 | relocation = -1; | |
db1ff28b JK |
6772 | for (i = 0; relocation == -1 && i < num_phdr; i++) |
6773 | if (is_elf64) | |
6774 | { | |
6775 | Elf64_Phdr *const p = (Elf64_Phdr *) (phdr_buf + i * phdr_size); | |
6776 | ||
6777 | if (p->p_type == PT_PHDR) | |
6778 | relocation = phdr_memaddr - p->p_vaddr; | |
6779 | } | |
6780 | else | |
6781 | { | |
6782 | Elf32_Phdr *const p = (Elf32_Phdr *) (phdr_buf + i * phdr_size); | |
6783 | ||
6784 | if (p->p_type == PT_PHDR) | |
6785 | relocation = phdr_memaddr - p->p_vaddr; | |
6786 | } | |
6787 | ||
2268b414 JK |
6788 | if (relocation == -1) |
6789 | { | |
e237a7e2 JK |
6790 | /* PT_PHDR is optional, but necessary for PIE in general. Fortunately |
6791 | any real world executables, including PIE executables, have always | |
6792 | PT_PHDR present. PT_PHDR is not present in some shared libraries or | |
6793 | in fpc (Free Pascal 2.4) binaries but neither of those have a need for | |
6794 | or present DT_DEBUG anyway (fpc binaries are statically linked). | |
6795 | ||
6796 | Therefore if there exists DT_DEBUG there is always also PT_PHDR. | |
6797 | ||
6798 | GDB could find RELOCATION also from AT_ENTRY - e_entry. */ | |
6799 | ||
2268b414 JK |
6800 | return 0; |
6801 | } | |
6802 | ||
db1ff28b JK |
6803 | for (i = 0; i < num_phdr; i++) |
6804 | { | |
6805 | if (is_elf64) | |
6806 | { | |
6807 | Elf64_Phdr *const p = (Elf64_Phdr *) (phdr_buf + i * phdr_size); | |
6808 | ||
6809 | if (p->p_type == PT_DYNAMIC) | |
6810 | return p->p_vaddr + relocation; | |
6811 | } | |
6812 | else | |
6813 | { | |
6814 | Elf32_Phdr *const p = (Elf32_Phdr *) (phdr_buf + i * phdr_size); | |
2268b414 | 6815 | |
db1ff28b JK |
6816 | if (p->p_type == PT_DYNAMIC) |
6817 | return p->p_vaddr + relocation; | |
6818 | } | |
6819 | } | |
2268b414 JK |
6820 | |
6821 | return 0; | |
6822 | } | |
6823 | ||
6824 | /* Return &_r_debug in the inferior, or -1 if not present. Return value | |
367ba2c2 MR |
6825 | can be 0 if the inferior does not yet have the library list initialized. |
6826 | We look for DT_MIPS_RLD_MAP first. MIPS executables use this instead of | |
6827 | DT_DEBUG, although they sometimes contain an unused DT_DEBUG entry too. */ | |
2268b414 JK |
6828 | |
6829 | static CORE_ADDR | |
6830 | get_r_debug (const int pid, const int is_elf64) | |
6831 | { | |
6832 | CORE_ADDR dynamic_memaddr; | |
6833 | const int dyn_size = is_elf64 ? sizeof (Elf64_Dyn) : sizeof (Elf32_Dyn); | |
6834 | unsigned char buf[sizeof (Elf64_Dyn)]; /* The larger of the two. */ | |
367ba2c2 | 6835 | CORE_ADDR map = -1; |
2268b414 JK |
6836 | |
6837 | dynamic_memaddr = get_dynamic (pid, is_elf64); | |
6838 | if (dynamic_memaddr == 0) | |
367ba2c2 | 6839 | return map; |
2268b414 JK |
6840 | |
6841 | while (linux_read_memory (dynamic_memaddr, buf, dyn_size) == 0) | |
6842 | { | |
6843 | if (is_elf64) | |
6844 | { | |
6845 | Elf64_Dyn *const dyn = (Elf64_Dyn *) buf; | |
a738da3a | 6846 | #if defined DT_MIPS_RLD_MAP || defined DT_MIPS_RLD_MAP_REL |
367ba2c2 MR |
6847 | union |
6848 | { | |
6849 | Elf64_Xword map; | |
6850 | unsigned char buf[sizeof (Elf64_Xword)]; | |
6851 | } | |
6852 | rld_map; | |
a738da3a MF |
6853 | #endif |
6854 | #ifdef DT_MIPS_RLD_MAP | |
367ba2c2 MR |
6855 | if (dyn->d_tag == DT_MIPS_RLD_MAP) |
6856 | { | |
6857 | if (linux_read_memory (dyn->d_un.d_val, | |
6858 | rld_map.buf, sizeof (rld_map.buf)) == 0) | |
6859 | return rld_map.map; | |
6860 | else | |
6861 | break; | |
6862 | } | |
75f62ce7 | 6863 | #endif /* DT_MIPS_RLD_MAP */ |
a738da3a MF |
6864 | #ifdef DT_MIPS_RLD_MAP_REL |
6865 | if (dyn->d_tag == DT_MIPS_RLD_MAP_REL) | |
6866 | { | |
6867 | if (linux_read_memory (dyn->d_un.d_val + dynamic_memaddr, | |
6868 | rld_map.buf, sizeof (rld_map.buf)) == 0) | |
6869 | return rld_map.map; | |
6870 | else | |
6871 | break; | |
6872 | } | |
6873 | #endif /* DT_MIPS_RLD_MAP_REL */ | |
2268b414 | 6874 | |
367ba2c2 MR |
6875 | if (dyn->d_tag == DT_DEBUG && map == -1) |
6876 | map = dyn->d_un.d_val; | |
2268b414 JK |
6877 | |
6878 | if (dyn->d_tag == DT_NULL) | |
6879 | break; | |
6880 | } | |
6881 | else | |
6882 | { | |
6883 | Elf32_Dyn *const dyn = (Elf32_Dyn *) buf; | |
a738da3a | 6884 | #if defined DT_MIPS_RLD_MAP || defined DT_MIPS_RLD_MAP_REL |
367ba2c2 MR |
6885 | union |
6886 | { | |
6887 | Elf32_Word map; | |
6888 | unsigned char buf[sizeof (Elf32_Word)]; | |
6889 | } | |
6890 | rld_map; | |
a738da3a MF |
6891 | #endif |
6892 | #ifdef DT_MIPS_RLD_MAP | |
367ba2c2 MR |
6893 | if (dyn->d_tag == DT_MIPS_RLD_MAP) |
6894 | { | |
6895 | if (linux_read_memory (dyn->d_un.d_val, | |
6896 | rld_map.buf, sizeof (rld_map.buf)) == 0) | |
6897 | return rld_map.map; | |
6898 | else | |
6899 | break; | |
6900 | } | |
75f62ce7 | 6901 | #endif /* DT_MIPS_RLD_MAP */ |
a738da3a MF |
6902 | #ifdef DT_MIPS_RLD_MAP_REL |
6903 | if (dyn->d_tag == DT_MIPS_RLD_MAP_REL) | |
6904 | { | |
6905 | if (linux_read_memory (dyn->d_un.d_val + dynamic_memaddr, | |
6906 | rld_map.buf, sizeof (rld_map.buf)) == 0) | |
6907 | return rld_map.map; | |
6908 | else | |
6909 | break; | |
6910 | } | |
6911 | #endif /* DT_MIPS_RLD_MAP_REL */ | |
2268b414 | 6912 | |
367ba2c2 MR |
6913 | if (dyn->d_tag == DT_DEBUG && map == -1) |
6914 | map = dyn->d_un.d_val; | |
2268b414 JK |
6915 | |
6916 | if (dyn->d_tag == DT_NULL) | |
6917 | break; | |
6918 | } | |
6919 | ||
6920 | dynamic_memaddr += dyn_size; | |
6921 | } | |
6922 | ||
367ba2c2 | 6923 | return map; |
2268b414 JK |
6924 | } |
6925 | ||
6926 | /* Read one pointer from MEMADDR in the inferior. */ | |
6927 | ||
6928 | static int | |
6929 | read_one_ptr (CORE_ADDR memaddr, CORE_ADDR *ptr, int ptr_size) | |
6930 | { | |
485f1ee4 PA |
6931 | int ret; |
6932 | ||
6933 | /* Go through a union so this works on either big or little endian | |
6934 | hosts, when the inferior's pointer size is smaller than the size | |
6935 | of CORE_ADDR. It is assumed the inferior's endianness is the | |
6936 | same of the superior's. */ | |
6937 | union | |
6938 | { | |
6939 | CORE_ADDR core_addr; | |
6940 | unsigned int ui; | |
6941 | unsigned char uc; | |
6942 | } addr; | |
6943 | ||
6944 | ret = linux_read_memory (memaddr, &addr.uc, ptr_size); | |
6945 | if (ret == 0) | |
6946 | { | |
6947 | if (ptr_size == sizeof (CORE_ADDR)) | |
6948 | *ptr = addr.core_addr; | |
6949 | else if (ptr_size == sizeof (unsigned int)) | |
6950 | *ptr = addr.ui; | |
6951 | else | |
6952 | gdb_assert_not_reached ("unhandled pointer size"); | |
6953 | } | |
6954 | return ret; | |
2268b414 JK |
6955 | } |
6956 | ||
6957 | struct link_map_offsets | |
6958 | { | |
6959 | /* Offset and size of r_debug.r_version. */ | |
6960 | int r_version_offset; | |
6961 | ||
6962 | /* Offset and size of r_debug.r_map. */ | |
6963 | int r_map_offset; | |
6964 | ||
6965 | /* Offset to l_addr field in struct link_map. */ | |
6966 | int l_addr_offset; | |
6967 | ||
6968 | /* Offset to l_name field in struct link_map. */ | |
6969 | int l_name_offset; | |
6970 | ||
6971 | /* Offset to l_ld field in struct link_map. */ | |
6972 | int l_ld_offset; | |
6973 | ||
6974 | /* Offset to l_next field in struct link_map. */ | |
6975 | int l_next_offset; | |
6976 | ||
6977 | /* Offset to l_prev field in struct link_map. */ | |
6978 | int l_prev_offset; | |
6979 | }; | |
6980 | ||
fb723180 | 6981 | /* Construct qXfer:libraries-svr4:read reply. */ |
2268b414 JK |
6982 | |
6983 | static int | |
6984 | linux_qxfer_libraries_svr4 (const char *annex, unsigned char *readbuf, | |
6985 | unsigned const char *writebuf, | |
6986 | CORE_ADDR offset, int len) | |
6987 | { | |
fe978cb0 | 6988 | struct process_info_private *const priv = current_process ()->priv; |
2268b414 JK |
6989 | char filename[PATH_MAX]; |
6990 | int pid, is_elf64; | |
6991 | ||
6992 | static const struct link_map_offsets lmo_32bit_offsets = | |
6993 | { | |
6994 | 0, /* r_version offset. */ | |
6995 | 4, /* r_debug.r_map offset. */ | |
6996 | 0, /* l_addr offset in link_map. */ | |
6997 | 4, /* l_name offset in link_map. */ | |
6998 | 8, /* l_ld offset in link_map. */ | |
6999 | 12, /* l_next offset in link_map. */ | |
7000 | 16 /* l_prev offset in link_map. */ | |
7001 | }; | |
7002 | ||
7003 | static const struct link_map_offsets lmo_64bit_offsets = | |
7004 | { | |
7005 | 0, /* r_version offset. */ | |
7006 | 8, /* r_debug.r_map offset. */ | |
7007 | 0, /* l_addr offset in link_map. */ | |
7008 | 8, /* l_name offset in link_map. */ | |
7009 | 16, /* l_ld offset in link_map. */ | |
7010 | 24, /* l_next offset in link_map. */ | |
7011 | 32 /* l_prev offset in link_map. */ | |
7012 | }; | |
7013 | const struct link_map_offsets *lmo; | |
214d508e | 7014 | unsigned int machine; |
b1fbec62 GB |
7015 | int ptr_size; |
7016 | CORE_ADDR lm_addr = 0, lm_prev = 0; | |
b1fbec62 GB |
7017 | CORE_ADDR l_name, l_addr, l_ld, l_next, l_prev; |
7018 | int header_done = 0; | |
2268b414 JK |
7019 | |
7020 | if (writebuf != NULL) | |
7021 | return -2; | |
7022 | if (readbuf == NULL) | |
7023 | return -1; | |
7024 | ||
0bfdf32f | 7025 | pid = lwpid_of (current_thread); |
2268b414 | 7026 | xsnprintf (filename, sizeof filename, "/proc/%d/exe", pid); |
214d508e | 7027 | is_elf64 = elf_64_file_p (filename, &machine); |
2268b414 | 7028 | lmo = is_elf64 ? &lmo_64bit_offsets : &lmo_32bit_offsets; |
b1fbec62 | 7029 | ptr_size = is_elf64 ? 8 : 4; |
2268b414 | 7030 | |
b1fbec62 GB |
7031 | while (annex[0] != '\0') |
7032 | { | |
7033 | const char *sep; | |
7034 | CORE_ADDR *addrp; | |
7035 | int len; | |
2268b414 | 7036 | |
b1fbec62 GB |
7037 | sep = strchr (annex, '='); |
7038 | if (sep == NULL) | |
7039 | break; | |
0c5bf5a9 | 7040 | |
b1fbec62 | 7041 | len = sep - annex; |
61012eef | 7042 | if (len == 5 && startswith (annex, "start")) |
b1fbec62 | 7043 | addrp = &lm_addr; |
61012eef | 7044 | else if (len == 4 && startswith (annex, "prev")) |
b1fbec62 GB |
7045 | addrp = &lm_prev; |
7046 | else | |
7047 | { | |
7048 | annex = strchr (sep, ';'); | |
7049 | if (annex == NULL) | |
7050 | break; | |
7051 | annex++; | |
7052 | continue; | |
7053 | } | |
7054 | ||
7055 | annex = decode_address_to_semicolon (addrp, sep + 1); | |
2268b414 | 7056 | } |
b1fbec62 GB |
7057 | |
7058 | if (lm_addr == 0) | |
2268b414 | 7059 | { |
b1fbec62 GB |
7060 | int r_version = 0; |
7061 | ||
7062 | if (priv->r_debug == 0) | |
7063 | priv->r_debug = get_r_debug (pid, is_elf64); | |
7064 | ||
7065 | /* We failed to find DT_DEBUG. Such situation will not change | |
7066 | for this inferior - do not retry it. Report it to GDB as | |
7067 | E01, see for the reasons at the GDB solib-svr4.c side. */ | |
7068 | if (priv->r_debug == (CORE_ADDR) -1) | |
7069 | return -1; | |
7070 | ||
7071 | if (priv->r_debug != 0) | |
2268b414 | 7072 | { |
b1fbec62 GB |
7073 | if (linux_read_memory (priv->r_debug + lmo->r_version_offset, |
7074 | (unsigned char *) &r_version, | |
7075 | sizeof (r_version)) != 0 | |
7076 | || r_version != 1) | |
7077 | { | |
7078 | warning ("unexpected r_debug version %d", r_version); | |
7079 | } | |
7080 | else if (read_one_ptr (priv->r_debug + lmo->r_map_offset, | |
7081 | &lm_addr, ptr_size) != 0) | |
7082 | { | |
7083 | warning ("unable to read r_map from 0x%lx", | |
7084 | (long) priv->r_debug + lmo->r_map_offset); | |
7085 | } | |
2268b414 | 7086 | } |
b1fbec62 | 7087 | } |
2268b414 | 7088 | |
f6e8a41e | 7089 | std::string document = "<library-list-svr4 version=\"1.0\""; |
b1fbec62 GB |
7090 | |
7091 | while (lm_addr | |
7092 | && read_one_ptr (lm_addr + lmo->l_name_offset, | |
7093 | &l_name, ptr_size) == 0 | |
7094 | && read_one_ptr (lm_addr + lmo->l_addr_offset, | |
7095 | &l_addr, ptr_size) == 0 | |
7096 | && read_one_ptr (lm_addr + lmo->l_ld_offset, | |
7097 | &l_ld, ptr_size) == 0 | |
7098 | && read_one_ptr (lm_addr + lmo->l_prev_offset, | |
7099 | &l_prev, ptr_size) == 0 | |
7100 | && read_one_ptr (lm_addr + lmo->l_next_offset, | |
7101 | &l_next, ptr_size) == 0) | |
7102 | { | |
7103 | unsigned char libname[PATH_MAX]; | |
7104 | ||
7105 | if (lm_prev != l_prev) | |
2268b414 | 7106 | { |
b1fbec62 GB |
7107 | warning ("Corrupted shared library list: 0x%lx != 0x%lx", |
7108 | (long) lm_prev, (long) l_prev); | |
7109 | break; | |
2268b414 JK |
7110 | } |
7111 | ||
d878444c JK |
7112 | /* Ignore the first entry even if it has valid name as the first entry |
7113 | corresponds to the main executable. The first entry should not be | |
7114 | skipped if the dynamic loader was loaded late by a static executable | |
7115 | (see solib-svr4.c parameter ignore_first). But in such case the main | |
7116 | executable does not have PT_DYNAMIC present and this function already | |
7117 | exited above due to failed get_r_debug. */ | |
7118 | if (lm_prev == 0) | |
f6e8a41e | 7119 | string_appendf (document, " main-lm=\"0x%lx\"", (unsigned long) lm_addr); |
d878444c JK |
7120 | else |
7121 | { | |
7122 | /* Not checking for error because reading may stop before | |
7123 | we've got PATH_MAX worth of characters. */ | |
7124 | libname[0] = '\0'; | |
7125 | linux_read_memory (l_name, libname, sizeof (libname) - 1); | |
7126 | libname[sizeof (libname) - 1] = '\0'; | |
7127 | if (libname[0] != '\0') | |
2268b414 | 7128 | { |
d878444c JK |
7129 | if (!header_done) |
7130 | { | |
7131 | /* Terminate `<library-list-svr4'. */ | |
f6e8a41e | 7132 | document += '>'; |
d878444c JK |
7133 | header_done = 1; |
7134 | } | |
2268b414 | 7135 | |
e6a58aa8 SM |
7136 | string_appendf (document, "<library name=\""); |
7137 | xml_escape_text_append (&document, (char *) libname); | |
7138 | string_appendf (document, "\" lm=\"0x%lx\" " | |
f6e8a41e | 7139 | "l_addr=\"0x%lx\" l_ld=\"0x%lx\"/>", |
e6a58aa8 SM |
7140 | (unsigned long) lm_addr, (unsigned long) l_addr, |
7141 | (unsigned long) l_ld); | |
d878444c | 7142 | } |
0afae3cf | 7143 | } |
b1fbec62 GB |
7144 | |
7145 | lm_prev = lm_addr; | |
7146 | lm_addr = l_next; | |
2268b414 JK |
7147 | } |
7148 | ||
b1fbec62 GB |
7149 | if (!header_done) |
7150 | { | |
7151 | /* Empty list; terminate `<library-list-svr4'. */ | |
f6e8a41e | 7152 | document += "/>"; |
b1fbec62 GB |
7153 | } |
7154 | else | |
f6e8a41e | 7155 | document += "</library-list-svr4>"; |
b1fbec62 | 7156 | |
f6e8a41e | 7157 | int document_len = document.length (); |
2268b414 JK |
7158 | if (offset < document_len) |
7159 | document_len -= offset; | |
7160 | else | |
7161 | document_len = 0; | |
7162 | if (len > document_len) | |
7163 | len = document_len; | |
7164 | ||
f6e8a41e | 7165 | memcpy (readbuf, document.data () + offset, len); |
2268b414 JK |
7166 | |
7167 | return len; | |
7168 | } | |
7169 | ||
9accd112 MM |
7170 | #ifdef HAVE_LINUX_BTRACE |
7171 | ||
969c39fb | 7172 | /* See to_disable_btrace target method. */ |
9accd112 | 7173 | |
969c39fb MM |
7174 | static int |
7175 | linux_low_disable_btrace (struct btrace_target_info *tinfo) | |
7176 | { | |
7177 | enum btrace_error err; | |
7178 | ||
7179 | err = linux_disable_btrace (tinfo); | |
7180 | return (err == BTRACE_ERR_NONE ? 0 : -1); | |
7181 | } | |
7182 | ||
bc504a31 | 7183 | /* Encode an Intel Processor Trace configuration. */ |
b20a6524 MM |
7184 | |
7185 | static void | |
7186 | linux_low_encode_pt_config (struct buffer *buffer, | |
7187 | const struct btrace_data_pt_config *config) | |
7188 | { | |
7189 | buffer_grow_str (buffer, "<pt-config>\n"); | |
7190 | ||
7191 | switch (config->cpu.vendor) | |
7192 | { | |
7193 | case CV_INTEL: | |
7194 | buffer_xml_printf (buffer, "<cpu vendor=\"GenuineIntel\" family=\"%u\" " | |
7195 | "model=\"%u\" stepping=\"%u\"/>\n", | |
7196 | config->cpu.family, config->cpu.model, | |
7197 | config->cpu.stepping); | |
7198 | break; | |
7199 | ||
7200 | default: | |
7201 | break; | |
7202 | } | |
7203 | ||
7204 | buffer_grow_str (buffer, "</pt-config>\n"); | |
7205 | } | |
7206 | ||
7207 | /* Encode a raw buffer. */ | |
7208 | ||
7209 | static void | |
7210 | linux_low_encode_raw (struct buffer *buffer, const gdb_byte *data, | |
7211 | unsigned int size) | |
7212 | { | |
7213 | if (size == 0) | |
7214 | return; | |
7215 | ||
7216 | /* We use hex encoding - see common/rsp-low.h. */ | |
7217 | buffer_grow_str (buffer, "<raw>\n"); | |
7218 | ||
7219 | while (size-- > 0) | |
7220 | { | |
7221 | char elem[2]; | |
7222 | ||
7223 | elem[0] = tohex ((*data >> 4) & 0xf); | |
7224 | elem[1] = tohex (*data++ & 0xf); | |
7225 | ||
7226 | buffer_grow (buffer, elem, 2); | |
7227 | } | |
7228 | ||
7229 | buffer_grow_str (buffer, "</raw>\n"); | |
7230 | } | |
7231 | ||
969c39fb MM |
7232 | /* See to_read_btrace target method. */ |
7233 | ||
7234 | static int | |
9accd112 | 7235 | linux_low_read_btrace (struct btrace_target_info *tinfo, struct buffer *buffer, |
add67df8 | 7236 | enum btrace_read_type type) |
9accd112 | 7237 | { |
734b0e4b | 7238 | struct btrace_data btrace; |
9accd112 | 7239 | struct btrace_block *block; |
969c39fb | 7240 | enum btrace_error err; |
9accd112 MM |
7241 | int i; |
7242 | ||
969c39fb MM |
7243 | err = linux_read_btrace (&btrace, tinfo, type); |
7244 | if (err != BTRACE_ERR_NONE) | |
7245 | { | |
7246 | if (err == BTRACE_ERR_OVERFLOW) | |
7247 | buffer_grow_str0 (buffer, "E.Overflow."); | |
7248 | else | |
7249 | buffer_grow_str0 (buffer, "E.Generic Error."); | |
7250 | ||
8dcc53b3 | 7251 | return -1; |
969c39fb | 7252 | } |
9accd112 | 7253 | |
734b0e4b MM |
7254 | switch (btrace.format) |
7255 | { | |
7256 | case BTRACE_FORMAT_NONE: | |
7257 | buffer_grow_str0 (buffer, "E.No Trace."); | |
8dcc53b3 | 7258 | return -1; |
734b0e4b MM |
7259 | |
7260 | case BTRACE_FORMAT_BTS: | |
7261 | buffer_grow_str (buffer, "<!DOCTYPE btrace SYSTEM \"btrace.dtd\">\n"); | |
7262 | buffer_grow_str (buffer, "<btrace version=\"1.0\">\n"); | |
9accd112 | 7263 | |
734b0e4b MM |
7264 | for (i = 0; |
7265 | VEC_iterate (btrace_block_s, btrace.variant.bts.blocks, i, block); | |
7266 | i++) | |
7267 | buffer_xml_printf (buffer, "<block begin=\"0x%s\" end=\"0x%s\"/>\n", | |
7268 | paddress (block->begin), paddress (block->end)); | |
9accd112 | 7269 | |
734b0e4b MM |
7270 | buffer_grow_str0 (buffer, "</btrace>\n"); |
7271 | break; | |
7272 | ||
b20a6524 MM |
7273 | case BTRACE_FORMAT_PT: |
7274 | buffer_grow_str (buffer, "<!DOCTYPE btrace SYSTEM \"btrace.dtd\">\n"); | |
7275 | buffer_grow_str (buffer, "<btrace version=\"1.0\">\n"); | |
7276 | buffer_grow_str (buffer, "<pt>\n"); | |
7277 | ||
7278 | linux_low_encode_pt_config (buffer, &btrace.variant.pt.config); | |
9accd112 | 7279 | |
b20a6524 MM |
7280 | linux_low_encode_raw (buffer, btrace.variant.pt.data, |
7281 | btrace.variant.pt.size); | |
7282 | ||
7283 | buffer_grow_str (buffer, "</pt>\n"); | |
7284 | buffer_grow_str0 (buffer, "</btrace>\n"); | |
7285 | break; | |
7286 | ||
7287 | default: | |
7288 | buffer_grow_str0 (buffer, "E.Unsupported Trace Format."); | |
8dcc53b3 | 7289 | return -1; |
734b0e4b | 7290 | } |
969c39fb MM |
7291 | |
7292 | return 0; | |
9accd112 | 7293 | } |
f4abbc16 MM |
7294 | |
7295 | /* See to_btrace_conf target method. */ | |
7296 | ||
7297 | static int | |
7298 | linux_low_btrace_conf (const struct btrace_target_info *tinfo, | |
7299 | struct buffer *buffer) | |
7300 | { | |
7301 | const struct btrace_config *conf; | |
7302 | ||
7303 | buffer_grow_str (buffer, "<!DOCTYPE btrace-conf SYSTEM \"btrace-conf.dtd\">\n"); | |
7304 | buffer_grow_str (buffer, "<btrace-conf version=\"1.0\">\n"); | |
7305 | ||
7306 | conf = linux_btrace_conf (tinfo); | |
7307 | if (conf != NULL) | |
7308 | { | |
7309 | switch (conf->format) | |
7310 | { | |
7311 | case BTRACE_FORMAT_NONE: | |
7312 | break; | |
7313 | ||
7314 | case BTRACE_FORMAT_BTS: | |
d33501a5 MM |
7315 | buffer_xml_printf (buffer, "<bts"); |
7316 | buffer_xml_printf (buffer, " size=\"0x%x\"", conf->bts.size); | |
7317 | buffer_xml_printf (buffer, " />\n"); | |
f4abbc16 | 7318 | break; |
b20a6524 MM |
7319 | |
7320 | case BTRACE_FORMAT_PT: | |
7321 | buffer_xml_printf (buffer, "<pt"); | |
7322 | buffer_xml_printf (buffer, " size=\"0x%x\"", conf->pt.size); | |
7323 | buffer_xml_printf (buffer, "/>\n"); | |
7324 | break; | |
f4abbc16 MM |
7325 | } |
7326 | } | |
7327 | ||
7328 | buffer_grow_str0 (buffer, "</btrace-conf>\n"); | |
7329 | return 0; | |
7330 | } | |
9accd112 MM |
7331 | #endif /* HAVE_LINUX_BTRACE */ |
7332 | ||
7b669087 GB |
7333 | /* See nat/linux-nat.h. */ |
7334 | ||
7335 | ptid_t | |
7336 | current_lwp_ptid (void) | |
7337 | { | |
7338 | return ptid_of (current_thread); | |
7339 | } | |
7340 | ||
dd373349 AT |
7341 | /* Implementation of the target_ops method "breakpoint_kind_from_pc". */ |
7342 | ||
7343 | static int | |
7344 | linux_breakpoint_kind_from_pc (CORE_ADDR *pcptr) | |
7345 | { | |
7346 | if (the_low_target.breakpoint_kind_from_pc != NULL) | |
7347 | return (*the_low_target.breakpoint_kind_from_pc) (pcptr); | |
7348 | else | |
1652a986 | 7349 | return default_breakpoint_kind_from_pc (pcptr); |
dd373349 AT |
7350 | } |
7351 | ||
7352 | /* Implementation of the target_ops method "sw_breakpoint_from_kind". */ | |
7353 | ||
7354 | static const gdb_byte * | |
7355 | linux_sw_breakpoint_from_kind (int kind, int *size) | |
7356 | { | |
7357 | gdb_assert (the_low_target.sw_breakpoint_from_kind != NULL); | |
7358 | ||
7359 | return (*the_low_target.sw_breakpoint_from_kind) (kind, size); | |
7360 | } | |
7361 | ||
769ef81f AT |
7362 | /* Implementation of the target_ops method |
7363 | "breakpoint_kind_from_current_state". */ | |
7364 | ||
7365 | static int | |
7366 | linux_breakpoint_kind_from_current_state (CORE_ADDR *pcptr) | |
7367 | { | |
7368 | if (the_low_target.breakpoint_kind_from_current_state != NULL) | |
7369 | return (*the_low_target.breakpoint_kind_from_current_state) (pcptr); | |
7370 | else | |
7371 | return linux_breakpoint_kind_from_pc (pcptr); | |
7372 | } | |
7373 | ||
276d4552 YQ |
7374 | /* Default implementation of linux_target_ops method "set_pc" for |
7375 | 32-bit pc register which is literally named "pc". */ | |
7376 | ||
7377 | void | |
7378 | linux_set_pc_32bit (struct regcache *regcache, CORE_ADDR pc) | |
7379 | { | |
7380 | uint32_t newpc = pc; | |
7381 | ||
7382 | supply_register_by_name (regcache, "pc", &newpc); | |
7383 | } | |
7384 | ||
7385 | /* Default implementation of linux_target_ops method "get_pc" for | |
7386 | 32-bit pc register which is literally named "pc". */ | |
7387 | ||
7388 | CORE_ADDR | |
7389 | linux_get_pc_32bit (struct regcache *regcache) | |
7390 | { | |
7391 | uint32_t pc; | |
7392 | ||
7393 | collect_register_by_name (regcache, "pc", &pc); | |
7394 | if (debug_threads) | |
7395 | debug_printf ("stop pc is 0x%" PRIx32 "\n", pc); | |
7396 | return pc; | |
7397 | } | |
7398 | ||
6f69e520 YQ |
7399 | /* Default implementation of linux_target_ops method "set_pc" for |
7400 | 64-bit pc register which is literally named "pc". */ | |
7401 | ||
7402 | void | |
7403 | linux_set_pc_64bit (struct regcache *regcache, CORE_ADDR pc) | |
7404 | { | |
7405 | uint64_t newpc = pc; | |
7406 | ||
7407 | supply_register_by_name (regcache, "pc", &newpc); | |
7408 | } | |
7409 | ||
7410 | /* Default implementation of linux_target_ops method "get_pc" for | |
7411 | 64-bit pc register which is literally named "pc". */ | |
7412 | ||
7413 | CORE_ADDR | |
7414 | linux_get_pc_64bit (struct regcache *regcache) | |
7415 | { | |
7416 | uint64_t pc; | |
7417 | ||
7418 | collect_register_by_name (regcache, "pc", &pc); | |
7419 | if (debug_threads) | |
7420 | debug_printf ("stop pc is 0x%" PRIx64 "\n", pc); | |
7421 | return pc; | |
7422 | } | |
7423 | ||
7424 | ||
ce3a066d DJ |
7425 | static struct target_ops linux_target_ops = { |
7426 | linux_create_inferior, | |
ece66d65 | 7427 | linux_post_create_inferior, |
ce3a066d DJ |
7428 | linux_attach, |
7429 | linux_kill, | |
6ad8ae5c | 7430 | linux_detach, |
8336d594 | 7431 | linux_mourn, |
444d6139 | 7432 | linux_join, |
ce3a066d DJ |
7433 | linux_thread_alive, |
7434 | linux_resume, | |
7435 | linux_wait, | |
7436 | linux_fetch_registers, | |
7437 | linux_store_registers, | |
90d74c30 | 7438 | linux_prepare_to_access_memory, |
0146f85b | 7439 | linux_done_accessing_memory, |
ce3a066d DJ |
7440 | linux_read_memory, |
7441 | linux_write_memory, | |
2f2893d9 | 7442 | linux_look_up_symbols, |
ef57601b | 7443 | linux_request_interrupt, |
aa691b87 | 7444 | linux_read_auxv, |
802e8e6d | 7445 | linux_supports_z_point_type, |
d993e290 PA |
7446 | linux_insert_point, |
7447 | linux_remove_point, | |
3e572f71 PA |
7448 | linux_stopped_by_sw_breakpoint, |
7449 | linux_supports_stopped_by_sw_breakpoint, | |
7450 | linux_stopped_by_hw_breakpoint, | |
7451 | linux_supports_stopped_by_hw_breakpoint, | |
70b90b91 | 7452 | linux_supports_hardware_single_step, |
e013ee27 OF |
7453 | linux_stopped_by_watchpoint, |
7454 | linux_stopped_data_address, | |
db0dfaa0 LM |
7455 | #if defined(__UCLIBC__) && defined(HAS_NOMMU) \ |
7456 | && defined(PT_TEXT_ADDR) && defined(PT_DATA_ADDR) \ | |
7457 | && defined(PT_TEXT_END_ADDR) | |
52fb6437 | 7458 | linux_read_offsets, |
dae5f5cf DJ |
7459 | #else |
7460 | NULL, | |
7461 | #endif | |
7462 | #ifdef USE_THREAD_DB | |
7463 | thread_db_get_tls_address, | |
7464 | #else | |
7465 | NULL, | |
52fb6437 | 7466 | #endif |
efcbbd14 | 7467 | linux_qxfer_spu, |
59a016f0 | 7468 | hostio_last_error_from_errno, |
07e059b5 | 7469 | linux_qxfer_osdata, |
4aa995e1 | 7470 | linux_xfer_siginfo, |
bd99dc85 PA |
7471 | linux_supports_non_stop, |
7472 | linux_async, | |
7473 | linux_start_non_stop, | |
cdbfd419 | 7474 | linux_supports_multi_process, |
89245bc0 DB |
7475 | linux_supports_fork_events, |
7476 | linux_supports_vfork_events, | |
94585166 | 7477 | linux_supports_exec_events, |
de0d863e | 7478 | linux_handle_new_gdb_connection, |
cdbfd419 | 7479 | #ifdef USE_THREAD_DB |
dc146f7c | 7480 | thread_db_handle_monitor_command, |
cdbfd419 | 7481 | #else |
dc146f7c | 7482 | NULL, |
cdbfd419 | 7483 | #endif |
d26e3629 | 7484 | linux_common_core_of_thread, |
78d85199 | 7485 | linux_read_loadmap, |
219f2f23 PA |
7486 | linux_process_qsupported, |
7487 | linux_supports_tracepoints, | |
7488 | linux_read_pc, | |
8336d594 PA |
7489 | linux_write_pc, |
7490 | linux_thread_stopped, | |
7984d532 | 7491 | NULL, |
711e434b | 7492 | linux_pause_all, |
7984d532 | 7493 | linux_unpause_all, |
fa593d66 | 7494 | linux_stabilize_threads, |
6a271cae | 7495 | linux_install_fast_tracepoint_jump_pad, |
03583c20 UW |
7496 | linux_emit_ops, |
7497 | linux_supports_disable_randomization, | |
405f8e94 | 7498 | linux_get_min_fast_tracepoint_insn_len, |
2268b414 | 7499 | linux_qxfer_libraries_svr4, |
d1feda86 | 7500 | linux_supports_agent, |
9accd112 | 7501 | #ifdef HAVE_LINUX_BTRACE |
0568462b | 7502 | linux_enable_btrace, |
969c39fb | 7503 | linux_low_disable_btrace, |
9accd112 | 7504 | linux_low_read_btrace, |
f4abbc16 | 7505 | linux_low_btrace_conf, |
9accd112 MM |
7506 | #else |
7507 | NULL, | |
7508 | NULL, | |
7509 | NULL, | |
7510 | NULL, | |
9accd112 | 7511 | #endif |
c2d6af84 | 7512 | linux_supports_range_stepping, |
e57f1de3 | 7513 | linux_proc_pid_to_exec_file, |
14d2069a GB |
7514 | linux_mntns_open_cloexec, |
7515 | linux_mntns_unlink, | |
7516 | linux_mntns_readlink, | |
dd373349 | 7517 | linux_breakpoint_kind_from_pc, |
79efa585 SM |
7518 | linux_sw_breakpoint_from_kind, |
7519 | linux_proc_tid_get_name, | |
7d00775e | 7520 | linux_breakpoint_kind_from_current_state, |
82075af2 JS |
7521 | linux_supports_software_single_step, |
7522 | linux_supports_catch_syscall, | |
ae91f625 | 7523 | linux_get_ipa_tdesc_idx, |
f6327dcb KB |
7524 | #if USE_THREAD_DB |
7525 | thread_db_thread_handle, | |
7526 | #else | |
7527 | NULL, | |
7528 | #endif | |
ce3a066d DJ |
7529 | }; |
7530 | ||
3aee8918 PA |
7531 | #ifdef HAVE_LINUX_REGSETS |
7532 | void | |
7533 | initialize_regsets_info (struct regsets_info *info) | |
7534 | { | |
7535 | for (info->num_regsets = 0; | |
7536 | info->regsets[info->num_regsets].size >= 0; | |
7537 | info->num_regsets++) | |
7538 | ; | |
3aee8918 PA |
7539 | } |
7540 | #endif | |
7541 | ||
da6d8c04 DJ |
7542 | void |
7543 | initialize_low (void) | |
7544 | { | |
bd99dc85 | 7545 | struct sigaction sigchld_action; |
dd373349 | 7546 | |
bd99dc85 | 7547 | memset (&sigchld_action, 0, sizeof (sigchld_action)); |
ce3a066d | 7548 | set_target_ops (&linux_target_ops); |
dd373349 | 7549 | |
aa7c7447 | 7550 | linux_ptrace_init_warnings (); |
1b919490 | 7551 | linux_proc_init_warnings (); |
bd99dc85 PA |
7552 | |
7553 | sigchld_action.sa_handler = sigchld_handler; | |
7554 | sigemptyset (&sigchld_action.sa_mask); | |
7555 | sigchld_action.sa_flags = SA_RESTART; | |
7556 | sigaction (SIGCHLD, &sigchld_action, NULL); | |
3aee8918 PA |
7557 | |
7558 | initialize_low_arch (); | |
89245bc0 DB |
7559 | |
7560 | linux_check_ptrace_features (); | |
da6d8c04 | 7561 | } |