Commit | Line | Data |
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da6d8c04 | 1 | /* Low level interface to ptrace, for the remote server for GDB. |
61baf725 | 2 | Copyright (C) 1995-2017 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" | |
957f3f49 DE |
53 | #ifndef ELFMAG0 |
54 | /* Don't include <linux/elf.h> here. If it got included by gdb_proc_service.h | |
55 | then ELFMAG0 will have been defined. If it didn't get included by | |
56 | gdb_proc_service.h then including it will likely introduce a duplicate | |
57 | definition of elf_fpregset_t. */ | |
58 | #include <elf.h> | |
59 | #endif | |
14d2069a | 60 | #include "nat/linux-namespaces.h" |
efcbbd14 UW |
61 | |
62 | #ifndef SPUFS_MAGIC | |
63 | #define SPUFS_MAGIC 0x23c9b64e | |
64 | #endif | |
da6d8c04 | 65 | |
03583c20 UW |
66 | #ifdef HAVE_PERSONALITY |
67 | # include <sys/personality.h> | |
68 | # if !HAVE_DECL_ADDR_NO_RANDOMIZE | |
69 | # define ADDR_NO_RANDOMIZE 0x0040000 | |
70 | # endif | |
71 | #endif | |
72 | ||
fd462a61 DJ |
73 | #ifndef O_LARGEFILE |
74 | #define O_LARGEFILE 0 | |
75 | #endif | |
1a981360 | 76 | |
db0dfaa0 LM |
77 | /* Some targets did not define these ptrace constants from the start, |
78 | so gdbserver defines them locally here. In the future, these may | |
79 | be removed after they are added to asm/ptrace.h. */ | |
80 | #if !(defined(PT_TEXT_ADDR) \ | |
81 | || defined(PT_DATA_ADDR) \ | |
82 | || defined(PT_TEXT_END_ADDR)) | |
83 | #if defined(__mcoldfire__) | |
84 | /* These are still undefined in 3.10 kernels. */ | |
85 | #define PT_TEXT_ADDR 49*4 | |
86 | #define PT_DATA_ADDR 50*4 | |
87 | #define PT_TEXT_END_ADDR 51*4 | |
88 | /* BFIN already defines these since at least 2.6.32 kernels. */ | |
89 | #elif defined(BFIN) | |
90 | #define PT_TEXT_ADDR 220 | |
91 | #define PT_TEXT_END_ADDR 224 | |
92 | #define PT_DATA_ADDR 228 | |
93 | /* These are still undefined in 3.10 kernels. */ | |
94 | #elif defined(__TMS320C6X__) | |
95 | #define PT_TEXT_ADDR (0x10000*4) | |
96 | #define PT_DATA_ADDR (0x10004*4) | |
97 | #define PT_TEXT_END_ADDR (0x10008*4) | |
98 | #endif | |
99 | #endif | |
100 | ||
9accd112 | 101 | #ifdef HAVE_LINUX_BTRACE |
125f8a3d | 102 | # include "nat/linux-btrace.h" |
734b0e4b | 103 | # include "btrace-common.h" |
9accd112 MM |
104 | #endif |
105 | ||
8365dcf5 TJB |
106 | #ifndef HAVE_ELF32_AUXV_T |
107 | /* Copied from glibc's elf.h. */ | |
108 | typedef struct | |
109 | { | |
110 | uint32_t a_type; /* Entry type */ | |
111 | union | |
112 | { | |
113 | uint32_t a_val; /* Integer value */ | |
114 | /* We use to have pointer elements added here. We cannot do that, | |
115 | though, since it does not work when using 32-bit definitions | |
116 | on 64-bit platforms and vice versa. */ | |
117 | } a_un; | |
118 | } Elf32_auxv_t; | |
119 | #endif | |
120 | ||
121 | #ifndef HAVE_ELF64_AUXV_T | |
122 | /* Copied from glibc's elf.h. */ | |
123 | typedef struct | |
124 | { | |
125 | uint64_t a_type; /* Entry type */ | |
126 | union | |
127 | { | |
128 | uint64_t a_val; /* Integer value */ | |
129 | /* We use to have pointer elements added here. We cannot do that, | |
130 | though, since it does not work when using 32-bit definitions | |
131 | on 64-bit platforms and vice versa. */ | |
132 | } a_un; | |
133 | } Elf64_auxv_t; | |
134 | #endif | |
135 | ||
ded48a5e YQ |
136 | /* Does the current host support PTRACE_GETREGSET? */ |
137 | int have_ptrace_getregset = -1; | |
138 | ||
cff068da GB |
139 | /* LWP accessors. */ |
140 | ||
141 | /* See nat/linux-nat.h. */ | |
142 | ||
143 | ptid_t | |
144 | ptid_of_lwp (struct lwp_info *lwp) | |
145 | { | |
146 | return ptid_of (get_lwp_thread (lwp)); | |
147 | } | |
148 | ||
149 | /* See nat/linux-nat.h. */ | |
150 | ||
4b134ca1 GB |
151 | void |
152 | lwp_set_arch_private_info (struct lwp_info *lwp, | |
153 | struct arch_lwp_info *info) | |
154 | { | |
155 | lwp->arch_private = info; | |
156 | } | |
157 | ||
158 | /* See nat/linux-nat.h. */ | |
159 | ||
160 | struct arch_lwp_info * | |
161 | lwp_arch_private_info (struct lwp_info *lwp) | |
162 | { | |
163 | return lwp->arch_private; | |
164 | } | |
165 | ||
166 | /* See nat/linux-nat.h. */ | |
167 | ||
cff068da GB |
168 | int |
169 | lwp_is_stopped (struct lwp_info *lwp) | |
170 | { | |
171 | return lwp->stopped; | |
172 | } | |
173 | ||
174 | /* See nat/linux-nat.h. */ | |
175 | ||
176 | enum target_stop_reason | |
177 | lwp_stop_reason (struct lwp_info *lwp) | |
178 | { | |
179 | return lwp->stop_reason; | |
180 | } | |
181 | ||
0e00e962 AA |
182 | /* See nat/linux-nat.h. */ |
183 | ||
184 | int | |
185 | lwp_is_stepping (struct lwp_info *lwp) | |
186 | { | |
187 | return lwp->stepping; | |
188 | } | |
189 | ||
05044653 PA |
190 | /* A list of all unknown processes which receive stop signals. Some |
191 | other process will presumably claim each of these as forked | |
192 | children momentarily. */ | |
24a09b5f | 193 | |
05044653 PA |
194 | struct simple_pid_list |
195 | { | |
196 | /* The process ID. */ | |
197 | int pid; | |
198 | ||
199 | /* The status as reported by waitpid. */ | |
200 | int status; | |
201 | ||
202 | /* Next in chain. */ | |
203 | struct simple_pid_list *next; | |
204 | }; | |
205 | struct simple_pid_list *stopped_pids; | |
206 | ||
207 | /* Trivial list manipulation functions to keep track of a list of new | |
208 | stopped processes. */ | |
209 | ||
210 | static void | |
211 | add_to_pid_list (struct simple_pid_list **listp, int pid, int status) | |
212 | { | |
8d749320 | 213 | struct simple_pid_list *new_pid = XNEW (struct simple_pid_list); |
05044653 PA |
214 | |
215 | new_pid->pid = pid; | |
216 | new_pid->status = status; | |
217 | new_pid->next = *listp; | |
218 | *listp = new_pid; | |
219 | } | |
220 | ||
221 | static int | |
222 | pull_pid_from_list (struct simple_pid_list **listp, int pid, int *statusp) | |
223 | { | |
224 | struct simple_pid_list **p; | |
225 | ||
226 | for (p = listp; *p != NULL; p = &(*p)->next) | |
227 | if ((*p)->pid == pid) | |
228 | { | |
229 | struct simple_pid_list *next = (*p)->next; | |
230 | ||
231 | *statusp = (*p)->status; | |
232 | xfree (*p); | |
233 | *p = next; | |
234 | return 1; | |
235 | } | |
236 | return 0; | |
237 | } | |
24a09b5f | 238 | |
bde24c0a PA |
239 | enum stopping_threads_kind |
240 | { | |
241 | /* Not stopping threads presently. */ | |
242 | NOT_STOPPING_THREADS, | |
243 | ||
244 | /* Stopping threads. */ | |
245 | STOPPING_THREADS, | |
246 | ||
247 | /* Stopping and suspending threads. */ | |
248 | STOPPING_AND_SUSPENDING_THREADS | |
249 | }; | |
250 | ||
251 | /* This is set while stop_all_lwps is in effect. */ | |
252 | enum stopping_threads_kind stopping_threads = NOT_STOPPING_THREADS; | |
0d62e5e8 DJ |
253 | |
254 | /* FIXME make into a target method? */ | |
24a09b5f | 255 | int using_threads = 1; |
24a09b5f | 256 | |
fa593d66 PA |
257 | /* True if we're presently stabilizing threads (moving them out of |
258 | jump pads). */ | |
259 | static int stabilizing_threads; | |
260 | ||
2acc282a | 261 | static void linux_resume_one_lwp (struct lwp_info *lwp, |
54a0b537 | 262 | int step, int signal, siginfo_t *info); |
2bd7c093 | 263 | static void linux_resume (struct thread_resume *resume_info, size_t n); |
7984d532 PA |
264 | static void stop_all_lwps (int suspend, struct lwp_info *except); |
265 | static void unstop_all_lwps (int unsuspend, struct lwp_info *except); | |
f50bf8e5 | 266 | static void unsuspend_all_lwps (struct lwp_info *except); |
fa96cb38 PA |
267 | static int linux_wait_for_event_filtered (ptid_t wait_ptid, ptid_t filter_ptid, |
268 | int *wstat, int options); | |
95954743 | 269 | static int linux_wait_for_event (ptid_t ptid, int *wstat, int options); |
b3312d80 | 270 | static struct lwp_info *add_lwp (ptid_t ptid); |
94585166 | 271 | static void linux_mourn (struct process_info *process); |
c35fafde | 272 | static int linux_stopped_by_watchpoint (void); |
95954743 | 273 | static void mark_lwp_dead (struct lwp_info *lwp, int wstat); |
00db26fa | 274 | static int lwp_is_marked_dead (struct lwp_info *lwp); |
d50171e4 | 275 | static void proceed_all_lwps (void); |
d50171e4 | 276 | static int finish_step_over (struct lwp_info *lwp); |
d50171e4 | 277 | static int kill_lwp (unsigned long lwpid, int signo); |
863d01bd PA |
278 | static void enqueue_pending_signal (struct lwp_info *lwp, int signal, siginfo_t *info); |
279 | static void complete_ongoing_step_over (void); | |
ece66d65 | 280 | static int linux_low_ptrace_options (int attached); |
ced2dffb | 281 | static int check_ptrace_stopped_lwp_gone (struct lwp_info *lp); |
0e9a339e | 282 | static int proceed_one_lwp (struct inferior_list_entry *entry, void *except); |
d50171e4 | 283 | |
582511be PA |
284 | /* When the event-loop is doing a step-over, this points at the thread |
285 | being stepped. */ | |
286 | ptid_t step_over_bkpt; | |
287 | ||
7d00775e | 288 | /* True if the low target can hardware single-step. */ |
d50171e4 PA |
289 | |
290 | static int | |
291 | can_hardware_single_step (void) | |
292 | { | |
7d00775e AT |
293 | if (the_low_target.supports_hardware_single_step != NULL) |
294 | return the_low_target.supports_hardware_single_step (); | |
295 | else | |
296 | return 0; | |
297 | } | |
298 | ||
299 | /* True if the low target can software single-step. Such targets | |
fa5308bd | 300 | implement the GET_NEXT_PCS callback. */ |
7d00775e AT |
301 | |
302 | static int | |
303 | can_software_single_step (void) | |
304 | { | |
fa5308bd | 305 | return (the_low_target.get_next_pcs != NULL); |
d50171e4 PA |
306 | } |
307 | ||
308 | /* True if the low target supports memory breakpoints. If so, we'll | |
309 | have a GET_PC implementation. */ | |
310 | ||
311 | static int | |
312 | supports_breakpoints (void) | |
313 | { | |
314 | return (the_low_target.get_pc != NULL); | |
315 | } | |
0d62e5e8 | 316 | |
fa593d66 PA |
317 | /* Returns true if this target can support fast tracepoints. This |
318 | does not mean that the in-process agent has been loaded in the | |
319 | inferior. */ | |
320 | ||
321 | static int | |
322 | supports_fast_tracepoints (void) | |
323 | { | |
324 | return the_low_target.install_fast_tracepoint_jump_pad != NULL; | |
325 | } | |
326 | ||
c2d6af84 PA |
327 | /* True if LWP is stopped in its stepping range. */ |
328 | ||
329 | static int | |
330 | lwp_in_step_range (struct lwp_info *lwp) | |
331 | { | |
332 | CORE_ADDR pc = lwp->stop_pc; | |
333 | ||
334 | return (pc >= lwp->step_range_start && pc < lwp->step_range_end); | |
335 | } | |
336 | ||
0d62e5e8 DJ |
337 | struct pending_signals |
338 | { | |
339 | int signal; | |
32ca6d61 | 340 | siginfo_t info; |
0d62e5e8 DJ |
341 | struct pending_signals *prev; |
342 | }; | |
611cb4a5 | 343 | |
bd99dc85 PA |
344 | /* The read/write ends of the pipe registered as waitable file in the |
345 | event loop. */ | |
346 | static int linux_event_pipe[2] = { -1, -1 }; | |
347 | ||
348 | /* True if we're currently in async mode. */ | |
349 | #define target_is_async_p() (linux_event_pipe[0] != -1) | |
350 | ||
02fc4de7 | 351 | static void send_sigstop (struct lwp_info *lwp); |
fa96cb38 | 352 | static void wait_for_sigstop (void); |
bd99dc85 | 353 | |
d0722149 DE |
354 | /* Return non-zero if HEADER is a 64-bit ELF file. */ |
355 | ||
356 | static int | |
214d508e | 357 | elf_64_header_p (const Elf64_Ehdr *header, unsigned int *machine) |
d0722149 | 358 | { |
214d508e L |
359 | if (header->e_ident[EI_MAG0] == ELFMAG0 |
360 | && header->e_ident[EI_MAG1] == ELFMAG1 | |
361 | && header->e_ident[EI_MAG2] == ELFMAG2 | |
362 | && header->e_ident[EI_MAG3] == ELFMAG3) | |
363 | { | |
364 | *machine = header->e_machine; | |
365 | return header->e_ident[EI_CLASS] == ELFCLASS64; | |
366 | ||
367 | } | |
368 | *machine = EM_NONE; | |
369 | return -1; | |
d0722149 DE |
370 | } |
371 | ||
372 | /* Return non-zero if FILE is a 64-bit ELF file, | |
373 | zero if the file is not a 64-bit ELF file, | |
374 | and -1 if the file is not accessible or doesn't exist. */ | |
375 | ||
be07f1a2 | 376 | static int |
214d508e | 377 | elf_64_file_p (const char *file, unsigned int *machine) |
d0722149 | 378 | { |
957f3f49 | 379 | Elf64_Ehdr header; |
d0722149 DE |
380 | int fd; |
381 | ||
382 | fd = open (file, O_RDONLY); | |
383 | if (fd < 0) | |
384 | return -1; | |
385 | ||
386 | if (read (fd, &header, sizeof (header)) != sizeof (header)) | |
387 | { | |
388 | close (fd); | |
389 | return 0; | |
390 | } | |
391 | close (fd); | |
392 | ||
214d508e | 393 | return elf_64_header_p (&header, machine); |
d0722149 DE |
394 | } |
395 | ||
be07f1a2 PA |
396 | /* Accepts an integer PID; Returns true if the executable PID is |
397 | running is a 64-bit ELF file.. */ | |
398 | ||
399 | int | |
214d508e | 400 | linux_pid_exe_is_elf_64_file (int pid, unsigned int *machine) |
be07f1a2 | 401 | { |
d8d2a3ee | 402 | char file[PATH_MAX]; |
be07f1a2 PA |
403 | |
404 | sprintf (file, "/proc/%d/exe", pid); | |
214d508e | 405 | return elf_64_file_p (file, machine); |
be07f1a2 PA |
406 | } |
407 | ||
bd99dc85 PA |
408 | static void |
409 | delete_lwp (struct lwp_info *lwp) | |
410 | { | |
fa96cb38 PA |
411 | struct thread_info *thr = get_lwp_thread (lwp); |
412 | ||
413 | if (debug_threads) | |
414 | debug_printf ("deleting %ld\n", lwpid_of (thr)); | |
415 | ||
416 | remove_thread (thr); | |
aa5ca48f | 417 | free (lwp->arch_private); |
bd99dc85 PA |
418 | free (lwp); |
419 | } | |
420 | ||
95954743 PA |
421 | /* Add a process to the common process list, and set its private |
422 | data. */ | |
423 | ||
424 | static struct process_info * | |
425 | linux_add_process (int pid, int attached) | |
426 | { | |
427 | struct process_info *proc; | |
428 | ||
95954743 | 429 | proc = add_process (pid, attached); |
8d749320 | 430 | proc->priv = XCNEW (struct process_info_private); |
95954743 | 431 | |
aa5ca48f | 432 | if (the_low_target.new_process != NULL) |
fe978cb0 | 433 | proc->priv->arch_private = the_low_target.new_process (); |
aa5ca48f | 434 | |
95954743 PA |
435 | return proc; |
436 | } | |
437 | ||
582511be PA |
438 | static CORE_ADDR get_pc (struct lwp_info *lwp); |
439 | ||
ece66d65 | 440 | /* Call the target arch_setup function on the current thread. */ |
94585166 DB |
441 | |
442 | static void | |
443 | linux_arch_setup (void) | |
444 | { | |
445 | the_low_target.arch_setup (); | |
446 | } | |
447 | ||
448 | /* Call the target arch_setup function on THREAD. */ | |
449 | ||
450 | static void | |
451 | linux_arch_setup_thread (struct thread_info *thread) | |
452 | { | |
453 | struct thread_info *saved_thread; | |
454 | ||
455 | saved_thread = current_thread; | |
456 | current_thread = thread; | |
457 | ||
458 | linux_arch_setup (); | |
459 | ||
460 | current_thread = saved_thread; | |
461 | } | |
462 | ||
463 | /* Handle a GNU/Linux extended wait response. If we see a clone, | |
464 | fork, or vfork event, we need to add the new LWP to our list | |
465 | (and return 0 so as not to report the trap to higher layers). | |
466 | If we see an exec event, we will modify ORIG_EVENT_LWP to point | |
467 | to a new LWP representing the new program. */ | |
0d62e5e8 | 468 | |
de0d863e | 469 | static int |
94585166 | 470 | handle_extended_wait (struct lwp_info **orig_event_lwp, int wstat) |
24a09b5f | 471 | { |
94585166 | 472 | struct lwp_info *event_lwp = *orig_event_lwp; |
89a5711c | 473 | int event = linux_ptrace_get_extended_event (wstat); |
de0d863e | 474 | struct thread_info *event_thr = get_lwp_thread (event_lwp); |
54a0b537 | 475 | struct lwp_info *new_lwp; |
24a09b5f | 476 | |
65706a29 PA |
477 | gdb_assert (event_lwp->waitstatus.kind == TARGET_WAITKIND_IGNORE); |
478 | ||
82075af2 JS |
479 | /* All extended events we currently use are mid-syscall. Only |
480 | PTRACE_EVENT_STOP is delivered more like a signal-stop, but | |
481 | you have to be using PTRACE_SEIZE to get that. */ | |
482 | event_lwp->syscall_state = TARGET_WAITKIND_SYSCALL_ENTRY; | |
483 | ||
c269dbdb DB |
484 | if ((event == PTRACE_EVENT_FORK) || (event == PTRACE_EVENT_VFORK) |
485 | || (event == PTRACE_EVENT_CLONE)) | |
24a09b5f | 486 | { |
95954743 | 487 | ptid_t ptid; |
24a09b5f | 488 | unsigned long new_pid; |
05044653 | 489 | int ret, status; |
24a09b5f | 490 | |
de0d863e | 491 | /* Get the pid of the new lwp. */ |
d86d4aaf | 492 | ptrace (PTRACE_GETEVENTMSG, lwpid_of (event_thr), (PTRACE_TYPE_ARG3) 0, |
56f7af9c | 493 | &new_pid); |
24a09b5f DJ |
494 | |
495 | /* If we haven't already seen the new PID stop, wait for it now. */ | |
05044653 | 496 | if (!pull_pid_from_list (&stopped_pids, new_pid, &status)) |
24a09b5f DJ |
497 | { |
498 | /* The new child has a pending SIGSTOP. We can't affect it until it | |
499 | hits the SIGSTOP, but we're already attached. */ | |
500 | ||
97438e3f | 501 | ret = my_waitpid (new_pid, &status, __WALL); |
24a09b5f DJ |
502 | |
503 | if (ret == -1) | |
504 | perror_with_name ("waiting for new child"); | |
505 | else if (ret != new_pid) | |
506 | warning ("wait returned unexpected PID %d", ret); | |
da5898ce | 507 | else if (!WIFSTOPPED (status)) |
24a09b5f DJ |
508 | warning ("wait returned unexpected status 0x%x", status); |
509 | } | |
510 | ||
c269dbdb | 511 | if (event == PTRACE_EVENT_FORK || event == PTRACE_EVENT_VFORK) |
de0d863e DB |
512 | { |
513 | struct process_info *parent_proc; | |
514 | struct process_info *child_proc; | |
515 | struct lwp_info *child_lwp; | |
bfacd19d | 516 | struct thread_info *child_thr; |
de0d863e DB |
517 | struct target_desc *tdesc; |
518 | ||
519 | ptid = ptid_build (new_pid, new_pid, 0); | |
520 | ||
521 | if (debug_threads) | |
522 | { | |
523 | debug_printf ("HEW: Got fork event from LWP %ld, " | |
524 | "new child is %d\n", | |
525 | ptid_get_lwp (ptid_of (event_thr)), | |
526 | ptid_get_pid (ptid)); | |
527 | } | |
528 | ||
529 | /* Add the new process to the tables and clone the breakpoint | |
530 | lists of the parent. We need to do this even if the new process | |
531 | will be detached, since we will need the process object and the | |
532 | breakpoints to remove any breakpoints from memory when we | |
533 | detach, and the client side will access registers. */ | |
534 | child_proc = linux_add_process (new_pid, 0); | |
535 | gdb_assert (child_proc != NULL); | |
536 | child_lwp = add_lwp (ptid); | |
537 | gdb_assert (child_lwp != NULL); | |
538 | child_lwp->stopped = 1; | |
bfacd19d DB |
539 | child_lwp->must_set_ptrace_flags = 1; |
540 | child_lwp->status_pending_p = 0; | |
541 | child_thr = get_lwp_thread (child_lwp); | |
542 | child_thr->last_resume_kind = resume_stop; | |
998d452a PA |
543 | child_thr->last_status.kind = TARGET_WAITKIND_STOPPED; |
544 | ||
863d01bd | 545 | /* If we're suspending all threads, leave this one suspended |
0f8288ae YQ |
546 | too. If the fork/clone parent is stepping over a breakpoint, |
547 | all other threads have been suspended already. Leave the | |
548 | child suspended too. */ | |
549 | if (stopping_threads == STOPPING_AND_SUSPENDING_THREADS | |
550 | || event_lwp->bp_reinsert != 0) | |
863d01bd PA |
551 | { |
552 | if (debug_threads) | |
553 | debug_printf ("HEW: leaving child suspended\n"); | |
554 | child_lwp->suspended = 1; | |
555 | } | |
556 | ||
de0d863e DB |
557 | parent_proc = get_thread_process (event_thr); |
558 | child_proc->attached = parent_proc->attached; | |
2e7b624b YQ |
559 | |
560 | if (event_lwp->bp_reinsert != 0 | |
561 | && can_software_single_step () | |
562 | && event == PTRACE_EVENT_VFORK) | |
563 | { | |
3b9a79ef YQ |
564 | /* If we leave single-step breakpoints there, child will |
565 | hit it, so uninsert single-step breakpoints from parent | |
2e7b624b YQ |
566 | (and child). Once vfork child is done, reinsert |
567 | them back to parent. */ | |
3b9a79ef | 568 | uninsert_single_step_breakpoints (event_thr); |
2e7b624b YQ |
569 | } |
570 | ||
63c40ec7 | 571 | clone_all_breakpoints (child_thr, event_thr); |
de0d863e | 572 | |
cc397f3a | 573 | tdesc = allocate_target_description (); |
de0d863e DB |
574 | copy_target_description (tdesc, parent_proc->tdesc); |
575 | child_proc->tdesc = tdesc; | |
de0d863e | 576 | |
3a8a0396 DB |
577 | /* Clone arch-specific process data. */ |
578 | if (the_low_target.new_fork != NULL) | |
579 | the_low_target.new_fork (parent_proc, child_proc); | |
580 | ||
de0d863e | 581 | /* Save fork info in the parent thread. */ |
c269dbdb DB |
582 | if (event == PTRACE_EVENT_FORK) |
583 | event_lwp->waitstatus.kind = TARGET_WAITKIND_FORKED; | |
584 | else if (event == PTRACE_EVENT_VFORK) | |
585 | event_lwp->waitstatus.kind = TARGET_WAITKIND_VFORKED; | |
586 | ||
de0d863e | 587 | event_lwp->waitstatus.value.related_pid = ptid; |
c269dbdb | 588 | |
de0d863e DB |
589 | /* The status_pending field contains bits denoting the |
590 | extended event, so when the pending event is handled, | |
591 | the handler will look at lwp->waitstatus. */ | |
592 | event_lwp->status_pending_p = 1; | |
593 | event_lwp->status_pending = wstat; | |
594 | ||
5a04c4cf PA |
595 | /* Link the threads until the parent event is passed on to |
596 | higher layers. */ | |
597 | event_lwp->fork_relative = child_lwp; | |
598 | child_lwp->fork_relative = event_lwp; | |
599 | ||
3b9a79ef YQ |
600 | /* If the parent thread is doing step-over with single-step |
601 | breakpoints, the list of single-step breakpoints are cloned | |
2e7b624b YQ |
602 | from the parent's. Remove them from the child process. |
603 | In case of vfork, we'll reinsert them back once vforked | |
604 | child is done. */ | |
8a81c5d7 | 605 | if (event_lwp->bp_reinsert != 0 |
2e7b624b | 606 | && can_software_single_step ()) |
8a81c5d7 | 607 | { |
8a81c5d7 YQ |
608 | /* The child process is forked and stopped, so it is safe |
609 | to access its memory without stopping all other threads | |
610 | from other processes. */ | |
3b9a79ef | 611 | delete_single_step_breakpoints (child_thr); |
8a81c5d7 | 612 | |
3b9a79ef YQ |
613 | gdb_assert (has_single_step_breakpoints (event_thr)); |
614 | gdb_assert (!has_single_step_breakpoints (child_thr)); | |
8a81c5d7 YQ |
615 | } |
616 | ||
de0d863e DB |
617 | /* Report the event. */ |
618 | return 0; | |
619 | } | |
620 | ||
fa96cb38 PA |
621 | if (debug_threads) |
622 | debug_printf ("HEW: Got clone event " | |
623 | "from LWP %ld, new child is LWP %ld\n", | |
624 | lwpid_of (event_thr), new_pid); | |
625 | ||
d86d4aaf | 626 | ptid = ptid_build (pid_of (event_thr), new_pid, 0); |
b3312d80 | 627 | new_lwp = add_lwp (ptid); |
24a09b5f | 628 | |
e27d73f6 DE |
629 | /* Either we're going to immediately resume the new thread |
630 | or leave it stopped. linux_resume_one_lwp is a nop if it | |
631 | thinks the thread is currently running, so set this first | |
632 | before calling linux_resume_one_lwp. */ | |
633 | new_lwp->stopped = 1; | |
634 | ||
0f8288ae YQ |
635 | /* If we're suspending all threads, leave this one suspended |
636 | too. If the fork/clone parent is stepping over a breakpoint, | |
637 | all other threads have been suspended already. Leave the | |
638 | child suspended too. */ | |
639 | if (stopping_threads == STOPPING_AND_SUSPENDING_THREADS | |
640 | || event_lwp->bp_reinsert != 0) | |
bde24c0a PA |
641 | new_lwp->suspended = 1; |
642 | ||
da5898ce DJ |
643 | /* Normally we will get the pending SIGSTOP. But in some cases |
644 | we might get another signal delivered to the group first. | |
f21cc1a2 | 645 | If we do get another signal, be sure not to lose it. */ |
20ba1ce6 | 646 | if (WSTOPSIG (status) != SIGSTOP) |
da5898ce | 647 | { |
54a0b537 | 648 | new_lwp->stop_expected = 1; |
20ba1ce6 PA |
649 | new_lwp->status_pending_p = 1; |
650 | new_lwp->status_pending = status; | |
da5898ce | 651 | } |
65706a29 PA |
652 | else if (report_thread_events) |
653 | { | |
654 | new_lwp->waitstatus.kind = TARGET_WAITKIND_THREAD_CREATED; | |
655 | new_lwp->status_pending_p = 1; | |
656 | new_lwp->status_pending = status; | |
657 | } | |
de0d863e DB |
658 | |
659 | /* Don't report the event. */ | |
660 | return 1; | |
24a09b5f | 661 | } |
c269dbdb DB |
662 | else if (event == PTRACE_EVENT_VFORK_DONE) |
663 | { | |
664 | event_lwp->waitstatus.kind = TARGET_WAITKIND_VFORK_DONE; | |
665 | ||
2e7b624b YQ |
666 | if (event_lwp->bp_reinsert != 0 && can_software_single_step ()) |
667 | { | |
3b9a79ef | 668 | reinsert_single_step_breakpoints (event_thr); |
2e7b624b | 669 | |
3b9a79ef | 670 | gdb_assert (has_single_step_breakpoints (event_thr)); |
2e7b624b YQ |
671 | } |
672 | ||
c269dbdb DB |
673 | /* Report the event. */ |
674 | return 0; | |
675 | } | |
94585166 DB |
676 | else if (event == PTRACE_EVENT_EXEC && report_exec_events) |
677 | { | |
678 | struct process_info *proc; | |
82075af2 | 679 | VEC (int) *syscalls_to_catch; |
94585166 DB |
680 | ptid_t event_ptid; |
681 | pid_t event_pid; | |
682 | ||
683 | if (debug_threads) | |
684 | { | |
685 | debug_printf ("HEW: Got exec event from LWP %ld\n", | |
686 | lwpid_of (event_thr)); | |
687 | } | |
688 | ||
689 | /* Get the event ptid. */ | |
690 | event_ptid = ptid_of (event_thr); | |
691 | event_pid = ptid_get_pid (event_ptid); | |
692 | ||
82075af2 | 693 | /* Save the syscall list from the execing process. */ |
94585166 | 694 | proc = get_thread_process (event_thr); |
82075af2 JS |
695 | syscalls_to_catch = proc->syscalls_to_catch; |
696 | proc->syscalls_to_catch = NULL; | |
697 | ||
698 | /* Delete the execing process and all its threads. */ | |
94585166 DB |
699 | linux_mourn (proc); |
700 | current_thread = NULL; | |
701 | ||
702 | /* Create a new process/lwp/thread. */ | |
703 | proc = linux_add_process (event_pid, 0); | |
704 | event_lwp = add_lwp (event_ptid); | |
705 | event_thr = get_lwp_thread (event_lwp); | |
706 | gdb_assert (current_thread == event_thr); | |
707 | linux_arch_setup_thread (event_thr); | |
708 | ||
709 | /* Set the event status. */ | |
710 | event_lwp->waitstatus.kind = TARGET_WAITKIND_EXECD; | |
711 | event_lwp->waitstatus.value.execd_pathname | |
712 | = xstrdup (linux_proc_pid_to_exec_file (lwpid_of (event_thr))); | |
713 | ||
714 | /* Mark the exec status as pending. */ | |
715 | event_lwp->stopped = 1; | |
716 | event_lwp->status_pending_p = 1; | |
717 | event_lwp->status_pending = wstat; | |
718 | event_thr->last_resume_kind = resume_continue; | |
719 | event_thr->last_status.kind = TARGET_WAITKIND_IGNORE; | |
720 | ||
82075af2 JS |
721 | /* Update syscall state in the new lwp, effectively mid-syscall too. */ |
722 | event_lwp->syscall_state = TARGET_WAITKIND_SYSCALL_ENTRY; | |
723 | ||
724 | /* Restore the list to catch. Don't rely on the client, which is free | |
725 | to avoid sending a new list when the architecture doesn't change. | |
726 | Also, for ANY_SYSCALL, the architecture doesn't really matter. */ | |
727 | proc->syscalls_to_catch = syscalls_to_catch; | |
728 | ||
94585166 DB |
729 | /* Report the event. */ |
730 | *orig_event_lwp = event_lwp; | |
731 | return 0; | |
732 | } | |
de0d863e DB |
733 | |
734 | internal_error (__FILE__, __LINE__, _("unknown ptrace event %d"), event); | |
24a09b5f DJ |
735 | } |
736 | ||
d50171e4 PA |
737 | /* Return the PC as read from the regcache of LWP, without any |
738 | adjustment. */ | |
739 | ||
740 | static CORE_ADDR | |
741 | get_pc (struct lwp_info *lwp) | |
742 | { | |
0bfdf32f | 743 | struct thread_info *saved_thread; |
d50171e4 PA |
744 | struct regcache *regcache; |
745 | CORE_ADDR pc; | |
746 | ||
747 | if (the_low_target.get_pc == NULL) | |
748 | return 0; | |
749 | ||
0bfdf32f GB |
750 | saved_thread = current_thread; |
751 | current_thread = get_lwp_thread (lwp); | |
d50171e4 | 752 | |
0bfdf32f | 753 | regcache = get_thread_regcache (current_thread, 1); |
d50171e4 PA |
754 | pc = (*the_low_target.get_pc) (regcache); |
755 | ||
756 | if (debug_threads) | |
87ce2a04 | 757 | debug_printf ("pc is 0x%lx\n", (long) pc); |
d50171e4 | 758 | |
0bfdf32f | 759 | current_thread = saved_thread; |
d50171e4 PA |
760 | return pc; |
761 | } | |
762 | ||
82075af2 | 763 | /* This function should only be called if LWP got a SYSCALL_SIGTRAP. |
4cc32bec | 764 | Fill *SYSNO with the syscall nr trapped. */ |
82075af2 JS |
765 | |
766 | static void | |
4cc32bec | 767 | get_syscall_trapinfo (struct lwp_info *lwp, int *sysno) |
82075af2 JS |
768 | { |
769 | struct thread_info *saved_thread; | |
770 | struct regcache *regcache; | |
771 | ||
772 | if (the_low_target.get_syscall_trapinfo == NULL) | |
773 | { | |
774 | /* If we cannot get the syscall trapinfo, report an unknown | |
4cc32bec | 775 | system call number. */ |
82075af2 | 776 | *sysno = UNKNOWN_SYSCALL; |
82075af2 JS |
777 | return; |
778 | } | |
779 | ||
780 | saved_thread = current_thread; | |
781 | current_thread = get_lwp_thread (lwp); | |
782 | ||
783 | regcache = get_thread_regcache (current_thread, 1); | |
4cc32bec | 784 | (*the_low_target.get_syscall_trapinfo) (regcache, sysno); |
82075af2 JS |
785 | |
786 | if (debug_threads) | |
4cc32bec | 787 | debug_printf ("get_syscall_trapinfo sysno %d\n", *sysno); |
82075af2 JS |
788 | |
789 | current_thread = saved_thread; | |
790 | } | |
791 | ||
e7ad2f14 | 792 | static int check_stopped_by_watchpoint (struct lwp_info *child); |
0d62e5e8 | 793 | |
e7ad2f14 PA |
794 | /* Called when the LWP stopped for a signal/trap. If it stopped for a |
795 | trap check what caused it (breakpoint, watchpoint, trace, etc.), | |
796 | and save the result in the LWP's stop_reason field. If it stopped | |
797 | for a breakpoint, decrement the PC if necessary on the lwp's | |
798 | architecture. Returns true if we now have the LWP's stop PC. */ | |
0d62e5e8 | 799 | |
582511be | 800 | static int |
e7ad2f14 | 801 | save_stop_reason (struct lwp_info *lwp) |
0d62e5e8 | 802 | { |
582511be PA |
803 | CORE_ADDR pc; |
804 | CORE_ADDR sw_breakpoint_pc; | |
805 | struct thread_info *saved_thread; | |
3e572f71 PA |
806 | #if USE_SIGTRAP_SIGINFO |
807 | siginfo_t siginfo; | |
808 | #endif | |
d50171e4 PA |
809 | |
810 | if (the_low_target.get_pc == NULL) | |
811 | return 0; | |
0d62e5e8 | 812 | |
582511be PA |
813 | pc = get_pc (lwp); |
814 | sw_breakpoint_pc = pc - the_low_target.decr_pc_after_break; | |
d50171e4 | 815 | |
582511be PA |
816 | /* breakpoint_at reads from the current thread. */ |
817 | saved_thread = current_thread; | |
818 | current_thread = get_lwp_thread (lwp); | |
47c0c975 | 819 | |
3e572f71 PA |
820 | #if USE_SIGTRAP_SIGINFO |
821 | if (ptrace (PTRACE_GETSIGINFO, lwpid_of (current_thread), | |
822 | (PTRACE_TYPE_ARG3) 0, &siginfo) == 0) | |
823 | { | |
824 | if (siginfo.si_signo == SIGTRAP) | |
825 | { | |
e7ad2f14 PA |
826 | if (GDB_ARCH_IS_TRAP_BRKPT (siginfo.si_code) |
827 | && GDB_ARCH_IS_TRAP_HWBKPT (siginfo.si_code)) | |
3e572f71 | 828 | { |
e7ad2f14 PA |
829 | /* The si_code is ambiguous on this arch -- check debug |
830 | registers. */ | |
831 | if (!check_stopped_by_watchpoint (lwp)) | |
832 | lwp->stop_reason = TARGET_STOPPED_BY_SW_BREAKPOINT; | |
833 | } | |
834 | else if (GDB_ARCH_IS_TRAP_BRKPT (siginfo.si_code)) | |
835 | { | |
836 | /* If we determine the LWP stopped for a SW breakpoint, | |
837 | trust it. Particularly don't check watchpoint | |
838 | registers, because at least on s390, we'd find | |
839 | stopped-by-watchpoint as long as there's a watchpoint | |
840 | set. */ | |
3e572f71 | 841 | lwp->stop_reason = TARGET_STOPPED_BY_SW_BREAKPOINT; |
3e572f71 | 842 | } |
e7ad2f14 | 843 | else if (GDB_ARCH_IS_TRAP_HWBKPT (siginfo.si_code)) |
3e572f71 | 844 | { |
e7ad2f14 PA |
845 | /* This can indicate either a hardware breakpoint or |
846 | hardware watchpoint. Check debug registers. */ | |
847 | if (!check_stopped_by_watchpoint (lwp)) | |
848 | lwp->stop_reason = TARGET_STOPPED_BY_HW_BREAKPOINT; | |
3e572f71 | 849 | } |
2bf6fb9d PA |
850 | else if (siginfo.si_code == TRAP_TRACE) |
851 | { | |
e7ad2f14 PA |
852 | /* We may have single stepped an instruction that |
853 | triggered a watchpoint. In that case, on some | |
854 | architectures (such as x86), instead of TRAP_HWBKPT, | |
855 | si_code indicates TRAP_TRACE, and we need to check | |
856 | the debug registers separately. */ | |
857 | if (!check_stopped_by_watchpoint (lwp)) | |
858 | lwp->stop_reason = TARGET_STOPPED_BY_SINGLE_STEP; | |
2bf6fb9d | 859 | } |
3e572f71 PA |
860 | } |
861 | } | |
862 | #else | |
582511be PA |
863 | /* We may have just stepped a breakpoint instruction. E.g., in |
864 | non-stop mode, GDB first tells the thread A to step a range, and | |
865 | then the user inserts a breakpoint inside the range. In that | |
8090aef2 PA |
866 | case we need to report the breakpoint PC. */ |
867 | if ((!lwp->stepping || lwp->stop_pc == sw_breakpoint_pc) | |
582511be | 868 | && (*the_low_target.breakpoint_at) (sw_breakpoint_pc)) |
e7ad2f14 PA |
869 | lwp->stop_reason = TARGET_STOPPED_BY_SW_BREAKPOINT; |
870 | ||
871 | if (hardware_breakpoint_inserted_here (pc)) | |
872 | lwp->stop_reason = TARGET_STOPPED_BY_HW_BREAKPOINT; | |
873 | ||
874 | if (lwp->stop_reason == TARGET_STOPPED_BY_NO_REASON) | |
875 | check_stopped_by_watchpoint (lwp); | |
876 | #endif | |
877 | ||
878 | if (lwp->stop_reason == TARGET_STOPPED_BY_SW_BREAKPOINT) | |
582511be PA |
879 | { |
880 | if (debug_threads) | |
881 | { | |
882 | struct thread_info *thr = get_lwp_thread (lwp); | |
883 | ||
884 | debug_printf ("CSBB: %s stopped by software breakpoint\n", | |
885 | target_pid_to_str (ptid_of (thr))); | |
886 | } | |
887 | ||
888 | /* Back up the PC if necessary. */ | |
889 | if (pc != sw_breakpoint_pc) | |
e7ad2f14 | 890 | { |
582511be PA |
891 | struct regcache *regcache |
892 | = get_thread_regcache (current_thread, 1); | |
893 | (*the_low_target.set_pc) (regcache, sw_breakpoint_pc); | |
894 | } | |
895 | ||
e7ad2f14 PA |
896 | /* Update this so we record the correct stop PC below. */ |
897 | pc = sw_breakpoint_pc; | |
582511be | 898 | } |
e7ad2f14 | 899 | else if (lwp->stop_reason == TARGET_STOPPED_BY_HW_BREAKPOINT) |
582511be PA |
900 | { |
901 | if (debug_threads) | |
902 | { | |
903 | struct thread_info *thr = get_lwp_thread (lwp); | |
904 | ||
905 | debug_printf ("CSBB: %s stopped by hardware breakpoint\n", | |
906 | target_pid_to_str (ptid_of (thr))); | |
907 | } | |
e7ad2f14 PA |
908 | } |
909 | else if (lwp->stop_reason == TARGET_STOPPED_BY_WATCHPOINT) | |
910 | { | |
911 | if (debug_threads) | |
912 | { | |
913 | struct thread_info *thr = get_lwp_thread (lwp); | |
47c0c975 | 914 | |
e7ad2f14 PA |
915 | debug_printf ("CSBB: %s stopped by hardware watchpoint\n", |
916 | target_pid_to_str (ptid_of (thr))); | |
917 | } | |
582511be | 918 | } |
e7ad2f14 PA |
919 | else if (lwp->stop_reason == TARGET_STOPPED_BY_SINGLE_STEP) |
920 | { | |
921 | if (debug_threads) | |
922 | { | |
923 | struct thread_info *thr = get_lwp_thread (lwp); | |
582511be | 924 | |
e7ad2f14 PA |
925 | debug_printf ("CSBB: %s stopped by trace\n", |
926 | target_pid_to_str (ptid_of (thr))); | |
927 | } | |
928 | } | |
929 | ||
930 | lwp->stop_pc = pc; | |
582511be | 931 | current_thread = saved_thread; |
e7ad2f14 | 932 | return 1; |
0d62e5e8 | 933 | } |
ce3a066d | 934 | |
b3312d80 | 935 | static struct lwp_info * |
95954743 | 936 | add_lwp (ptid_t ptid) |
611cb4a5 | 937 | { |
54a0b537 | 938 | struct lwp_info *lwp; |
0d62e5e8 | 939 | |
8d749320 | 940 | lwp = XCNEW (struct lwp_info); |
00db26fa PA |
941 | |
942 | lwp->waitstatus.kind = TARGET_WAITKIND_IGNORE; | |
0d62e5e8 | 943 | |
aa5ca48f | 944 | if (the_low_target.new_thread != NULL) |
34c703da | 945 | the_low_target.new_thread (lwp); |
aa5ca48f | 946 | |
f7667f0d | 947 | lwp->thread = add_thread (ptid, lwp); |
0d62e5e8 | 948 | |
54a0b537 | 949 | return lwp; |
0d62e5e8 | 950 | } |
611cb4a5 | 951 | |
2090129c SDJ |
952 | /* Callback to be used when calling fork_inferior, responsible for |
953 | actually initiating the tracing of the inferior. */ | |
954 | ||
955 | static void | |
956 | linux_ptrace_fun () | |
957 | { | |
958 | if (ptrace (PTRACE_TRACEME, 0, (PTRACE_TYPE_ARG3) 0, | |
959 | (PTRACE_TYPE_ARG4) 0) < 0) | |
960 | trace_start_error_with_name ("ptrace"); | |
961 | ||
962 | if (setpgid (0, 0) < 0) | |
963 | trace_start_error_with_name ("setpgid"); | |
964 | ||
965 | /* If GDBserver is connected to gdb via stdio, redirect the inferior's | |
966 | stdout to stderr so that inferior i/o doesn't corrupt the connection. | |
967 | Also, redirect stdin to /dev/null. */ | |
968 | if (remote_connection_is_stdio ()) | |
969 | { | |
970 | if (close (0) < 0) | |
971 | trace_start_error_with_name ("close"); | |
972 | if (open ("/dev/null", O_RDONLY) < 0) | |
973 | trace_start_error_with_name ("open"); | |
974 | if (dup2 (2, 1) < 0) | |
975 | trace_start_error_with_name ("dup2"); | |
976 | if (write (2, "stdin/stdout redirected\n", | |
977 | sizeof ("stdin/stdout redirected\n") - 1) < 0) | |
978 | { | |
979 | /* Errors ignored. */; | |
980 | } | |
981 | } | |
982 | } | |
983 | ||
da6d8c04 | 984 | /* Start an inferior process and returns its pid. |
2090129c SDJ |
985 | PROGRAM is the name of the program to be started, and PROGRAM_ARGS |
986 | are its arguments. */ | |
da6d8c04 | 987 | |
ce3a066d | 988 | static int |
2090129c SDJ |
989 | linux_create_inferior (const char *program, |
990 | const std::vector<char *> &program_args) | |
da6d8c04 | 991 | { |
a6dbe5df | 992 | struct lwp_info *new_lwp; |
da6d8c04 | 993 | int pid; |
95954743 | 994 | ptid_t ptid; |
8cc73a39 SDJ |
995 | struct cleanup *restore_personality |
996 | = maybe_disable_address_space_randomization (disable_randomization); | |
2090129c | 997 | std::string str_program_args = stringify_argv (program_args); |
03583c20 | 998 | |
2090129c SDJ |
999 | pid = fork_inferior (program, |
1000 | str_program_args.c_str (), | |
9a6c7d9c | 1001 | get_environ ()->envp (), linux_ptrace_fun, |
2090129c | 1002 | NULL, NULL, NULL, NULL); |
da6d8c04 | 1003 | |
8cc73a39 | 1004 | do_cleanups (restore_personality); |
03583c20 | 1005 | |
55d7b841 | 1006 | linux_add_process (pid, 0); |
95954743 PA |
1007 | |
1008 | ptid = ptid_build (pid, pid, 0); | |
1009 | new_lwp = add_lwp (ptid); | |
a6dbe5df | 1010 | new_lwp->must_set_ptrace_flags = 1; |
611cb4a5 | 1011 | |
2090129c SDJ |
1012 | post_fork_inferior (pid, program); |
1013 | ||
a9fa9f7d | 1014 | return pid; |
da6d8c04 DJ |
1015 | } |
1016 | ||
ece66d65 JS |
1017 | /* Implement the post_create_inferior target_ops method. */ |
1018 | ||
1019 | static void | |
1020 | linux_post_create_inferior (void) | |
1021 | { | |
1022 | struct lwp_info *lwp = get_thread_lwp (current_thread); | |
1023 | ||
1024 | linux_arch_setup (); | |
1025 | ||
1026 | if (lwp->must_set_ptrace_flags) | |
1027 | { | |
1028 | struct process_info *proc = current_process (); | |
1029 | int options = linux_low_ptrace_options (proc->attached); | |
1030 | ||
1031 | linux_enable_event_reporting (lwpid_of (current_thread), options); | |
1032 | lwp->must_set_ptrace_flags = 0; | |
1033 | } | |
1034 | } | |
1035 | ||
8784d563 PA |
1036 | /* Attach to an inferior process. Returns 0 on success, ERRNO on |
1037 | error. */ | |
da6d8c04 | 1038 | |
7ae1a6a6 PA |
1039 | int |
1040 | linux_attach_lwp (ptid_t ptid) | |
da6d8c04 | 1041 | { |
54a0b537 | 1042 | struct lwp_info *new_lwp; |
7ae1a6a6 | 1043 | int lwpid = ptid_get_lwp (ptid); |
611cb4a5 | 1044 | |
b8e1b30e | 1045 | if (ptrace (PTRACE_ATTACH, lwpid, (PTRACE_TYPE_ARG3) 0, (PTRACE_TYPE_ARG4) 0) |
56f7af9c | 1046 | != 0) |
7ae1a6a6 | 1047 | return errno; |
24a09b5f | 1048 | |
b3312d80 | 1049 | new_lwp = add_lwp (ptid); |
0d62e5e8 | 1050 | |
a6dbe5df PA |
1051 | /* We need to wait for SIGSTOP before being able to make the next |
1052 | ptrace call on this LWP. */ | |
1053 | new_lwp->must_set_ptrace_flags = 1; | |
1054 | ||
644cebc9 | 1055 | if (linux_proc_pid_is_stopped (lwpid)) |
c14d7ab2 PA |
1056 | { |
1057 | if (debug_threads) | |
87ce2a04 | 1058 | debug_printf ("Attached to a stopped process\n"); |
c14d7ab2 PA |
1059 | |
1060 | /* The process is definitely stopped. It is in a job control | |
1061 | stop, unless the kernel predates the TASK_STOPPED / | |
1062 | TASK_TRACED distinction, in which case it might be in a | |
1063 | ptrace stop. Make sure it is in a ptrace stop; from there we | |
1064 | can kill it, signal it, et cetera. | |
1065 | ||
1066 | First make sure there is a pending SIGSTOP. Since we are | |
1067 | already attached, the process can not transition from stopped | |
1068 | to running without a PTRACE_CONT; so we know this signal will | |
1069 | go into the queue. The SIGSTOP generated by PTRACE_ATTACH is | |
1070 | probably already in the queue (unless this kernel is old | |
1071 | enough to use TASK_STOPPED for ptrace stops); but since | |
1072 | SIGSTOP is not an RT signal, it can only be queued once. */ | |
1073 | kill_lwp (lwpid, SIGSTOP); | |
1074 | ||
1075 | /* Finally, resume the stopped process. This will deliver the | |
1076 | SIGSTOP (or a higher priority signal, just like normal | |
1077 | PTRACE_ATTACH), which we'll catch later on. */ | |
b8e1b30e | 1078 | ptrace (PTRACE_CONT, lwpid, (PTRACE_TYPE_ARG3) 0, (PTRACE_TYPE_ARG4) 0); |
c14d7ab2 PA |
1079 | } |
1080 | ||
0d62e5e8 | 1081 | /* The next time we wait for this LWP we'll see a SIGSTOP as PTRACE_ATTACH |
0e21c1ec DE |
1082 | brings it to a halt. |
1083 | ||
1084 | There are several cases to consider here: | |
1085 | ||
1086 | 1) gdbserver has already attached to the process and is being notified | |
1b3f6016 | 1087 | of a new thread that is being created. |
d50171e4 PA |
1088 | In this case we should ignore that SIGSTOP and resume the |
1089 | process. This is handled below by setting stop_expected = 1, | |
8336d594 | 1090 | and the fact that add_thread sets last_resume_kind == |
d50171e4 | 1091 | resume_continue. |
0e21c1ec DE |
1092 | |
1093 | 2) This is the first thread (the process thread), and we're attaching | |
1b3f6016 PA |
1094 | to it via attach_inferior. |
1095 | In this case we want the process thread to stop. | |
d50171e4 PA |
1096 | This is handled by having linux_attach set last_resume_kind == |
1097 | resume_stop after we return. | |
e3deef73 LM |
1098 | |
1099 | If the pid we are attaching to is also the tgid, we attach to and | |
1100 | stop all the existing threads. Otherwise, we attach to pid and | |
1101 | ignore any other threads in the same group as this pid. | |
0e21c1ec DE |
1102 | |
1103 | 3) GDB is connecting to gdbserver and is requesting an enumeration of all | |
1b3f6016 PA |
1104 | existing threads. |
1105 | In this case we want the thread to stop. | |
1106 | FIXME: This case is currently not properly handled. | |
1107 | We should wait for the SIGSTOP but don't. Things work apparently | |
1108 | because enough time passes between when we ptrace (ATTACH) and when | |
1109 | gdb makes the next ptrace call on the thread. | |
0d62e5e8 DJ |
1110 | |
1111 | On the other hand, if we are currently trying to stop all threads, we | |
1112 | should treat the new thread as if we had sent it a SIGSTOP. This works | |
54a0b537 | 1113 | because we are guaranteed that the add_lwp call above added us to the |
0e21c1ec DE |
1114 | end of the list, and so the new thread has not yet reached |
1115 | wait_for_sigstop (but will). */ | |
d50171e4 | 1116 | new_lwp->stop_expected = 1; |
0d62e5e8 | 1117 | |
7ae1a6a6 | 1118 | return 0; |
95954743 PA |
1119 | } |
1120 | ||
8784d563 PA |
1121 | /* Callback for linux_proc_attach_tgid_threads. Attach to PTID if not |
1122 | already attached. Returns true if a new LWP is found, false | |
1123 | otherwise. */ | |
1124 | ||
1125 | static int | |
1126 | attach_proc_task_lwp_callback (ptid_t ptid) | |
1127 | { | |
1128 | /* Is this a new thread? */ | |
1129 | if (find_thread_ptid (ptid) == NULL) | |
1130 | { | |
1131 | int lwpid = ptid_get_lwp (ptid); | |
1132 | int err; | |
1133 | ||
1134 | if (debug_threads) | |
1135 | debug_printf ("Found new lwp %d\n", lwpid); | |
1136 | ||
1137 | err = linux_attach_lwp (ptid); | |
1138 | ||
1139 | /* Be quiet if we simply raced with the thread exiting. EPERM | |
1140 | is returned if the thread's task still exists, and is marked | |
1141 | as exited or zombie, as well as other conditions, so in that | |
1142 | case, confirm the status in /proc/PID/status. */ | |
1143 | if (err == ESRCH | |
1144 | || (err == EPERM && linux_proc_pid_is_gone (lwpid))) | |
1145 | { | |
1146 | if (debug_threads) | |
1147 | { | |
1148 | debug_printf ("Cannot attach to lwp %d: " | |
1149 | "thread is gone (%d: %s)\n", | |
1150 | lwpid, err, strerror (err)); | |
1151 | } | |
1152 | } | |
1153 | else if (err != 0) | |
1154 | { | |
1155 | warning (_("Cannot attach to lwp %d: %s"), | |
1156 | lwpid, | |
1157 | linux_ptrace_attach_fail_reason_string (ptid, err)); | |
1158 | } | |
1159 | ||
1160 | return 1; | |
1161 | } | |
1162 | return 0; | |
1163 | } | |
1164 | ||
500c1d85 PA |
1165 | static void async_file_mark (void); |
1166 | ||
e3deef73 LM |
1167 | /* Attach to PID. If PID is the tgid, attach to it and all |
1168 | of its threads. */ | |
1169 | ||
c52daf70 | 1170 | static int |
a1928bad | 1171 | linux_attach (unsigned long pid) |
0d62e5e8 | 1172 | { |
500c1d85 PA |
1173 | struct process_info *proc; |
1174 | struct thread_info *initial_thread; | |
7ae1a6a6 PA |
1175 | ptid_t ptid = ptid_build (pid, pid, 0); |
1176 | int err; | |
1177 | ||
e3deef73 LM |
1178 | /* Attach to PID. We will check for other threads |
1179 | soon. */ | |
7ae1a6a6 PA |
1180 | err = linux_attach_lwp (ptid); |
1181 | if (err != 0) | |
1182 | error ("Cannot attach to process %ld: %s", | |
8784d563 | 1183 | pid, linux_ptrace_attach_fail_reason_string (ptid, err)); |
7ae1a6a6 | 1184 | |
500c1d85 | 1185 | proc = linux_add_process (pid, 1); |
0d62e5e8 | 1186 | |
500c1d85 PA |
1187 | /* Don't ignore the initial SIGSTOP if we just attached to this |
1188 | process. It will be collected by wait shortly. */ | |
1189 | initial_thread = find_thread_ptid (ptid_build (pid, pid, 0)); | |
1190 | initial_thread->last_resume_kind = resume_stop; | |
0d62e5e8 | 1191 | |
8784d563 PA |
1192 | /* We must attach to every LWP. If /proc is mounted, use that to |
1193 | find them now. On the one hand, the inferior may be using raw | |
1194 | clone instead of using pthreads. On the other hand, even if it | |
1195 | is using pthreads, GDB may not be connected yet (thread_db needs | |
1196 | to do symbol lookups, through qSymbol). Also, thread_db walks | |
1197 | structures in the inferior's address space to find the list of | |
1198 | threads/LWPs, and those structures may well be corrupted. Note | |
1199 | that once thread_db is loaded, we'll still use it to list threads | |
1200 | and associate pthread info with each LWP. */ | |
1201 | linux_proc_attach_tgid_threads (pid, attach_proc_task_lwp_callback); | |
500c1d85 PA |
1202 | |
1203 | /* GDB will shortly read the xml target description for this | |
1204 | process, to figure out the process' architecture. But the target | |
1205 | description is only filled in when the first process/thread in | |
1206 | the thread group reports its initial PTRACE_ATTACH SIGSTOP. Do | |
1207 | that now, otherwise, if GDB is fast enough, it could read the | |
1208 | target description _before_ that initial stop. */ | |
1209 | if (non_stop) | |
1210 | { | |
1211 | struct lwp_info *lwp; | |
1212 | int wstat, lwpid; | |
1213 | ptid_t pid_ptid = pid_to_ptid (pid); | |
1214 | ||
1215 | lwpid = linux_wait_for_event_filtered (pid_ptid, pid_ptid, | |
1216 | &wstat, __WALL); | |
1217 | gdb_assert (lwpid > 0); | |
1218 | ||
1219 | lwp = find_lwp_pid (pid_to_ptid (lwpid)); | |
1220 | ||
1221 | if (!WIFSTOPPED (wstat) || WSTOPSIG (wstat) != SIGSTOP) | |
1222 | { | |
1223 | lwp->status_pending_p = 1; | |
1224 | lwp->status_pending = wstat; | |
1225 | } | |
1226 | ||
1227 | initial_thread->last_resume_kind = resume_continue; | |
1228 | ||
1229 | async_file_mark (); | |
1230 | ||
1231 | gdb_assert (proc->tdesc != NULL); | |
1232 | } | |
1233 | ||
95954743 PA |
1234 | return 0; |
1235 | } | |
1236 | ||
1237 | struct counter | |
1238 | { | |
1239 | int pid; | |
1240 | int count; | |
1241 | }; | |
1242 | ||
1243 | static int | |
1244 | second_thread_of_pid_p (struct inferior_list_entry *entry, void *args) | |
1245 | { | |
9a3c8263 | 1246 | struct counter *counter = (struct counter *) args; |
95954743 PA |
1247 | |
1248 | if (ptid_get_pid (entry->id) == counter->pid) | |
1249 | { | |
1250 | if (++counter->count > 1) | |
1251 | return 1; | |
1252 | } | |
d61ddec4 | 1253 | |
da6d8c04 DJ |
1254 | return 0; |
1255 | } | |
1256 | ||
95954743 | 1257 | static int |
fa96cb38 | 1258 | last_thread_of_process_p (int pid) |
95954743 | 1259 | { |
95954743 | 1260 | struct counter counter = { pid , 0 }; |
da6d8c04 | 1261 | |
95954743 PA |
1262 | return (find_inferior (&all_threads, |
1263 | second_thread_of_pid_p, &counter) == NULL); | |
1264 | } | |
1265 | ||
da84f473 PA |
1266 | /* Kill LWP. */ |
1267 | ||
1268 | static void | |
1269 | linux_kill_one_lwp (struct lwp_info *lwp) | |
1270 | { | |
d86d4aaf DE |
1271 | struct thread_info *thr = get_lwp_thread (lwp); |
1272 | int pid = lwpid_of (thr); | |
da84f473 PA |
1273 | |
1274 | /* PTRACE_KILL is unreliable. After stepping into a signal handler, | |
1275 | there is no signal context, and ptrace(PTRACE_KILL) (or | |
1276 | ptrace(PTRACE_CONT, SIGKILL), pretty much the same) acts like | |
1277 | ptrace(CONT, pid, 0,0) and just resumes the tracee. A better | |
1278 | alternative is to kill with SIGKILL. We only need one SIGKILL | |
1279 | per process, not one for each thread. But since we still support | |
4a6ed09b PA |
1280 | support debugging programs using raw clone without CLONE_THREAD, |
1281 | we send one for each thread. For years, we used PTRACE_KILL | |
1282 | only, so we're being a bit paranoid about some old kernels where | |
1283 | PTRACE_KILL might work better (dubious if there are any such, but | |
1284 | that's why it's paranoia), so we try SIGKILL first, PTRACE_KILL | |
1285 | second, and so we're fine everywhere. */ | |
da84f473 PA |
1286 | |
1287 | errno = 0; | |
69ff6be5 | 1288 | kill_lwp (pid, SIGKILL); |
da84f473 | 1289 | if (debug_threads) |
ce9e3fe7 PA |
1290 | { |
1291 | int save_errno = errno; | |
1292 | ||
1293 | debug_printf ("LKL: kill_lwp (SIGKILL) %s, 0, 0 (%s)\n", | |
1294 | target_pid_to_str (ptid_of (thr)), | |
1295 | save_errno ? strerror (save_errno) : "OK"); | |
1296 | } | |
da84f473 PA |
1297 | |
1298 | errno = 0; | |
b8e1b30e | 1299 | ptrace (PTRACE_KILL, pid, (PTRACE_TYPE_ARG3) 0, (PTRACE_TYPE_ARG4) 0); |
da84f473 | 1300 | if (debug_threads) |
ce9e3fe7 PA |
1301 | { |
1302 | int save_errno = errno; | |
1303 | ||
1304 | debug_printf ("LKL: PTRACE_KILL %s, 0, 0 (%s)\n", | |
1305 | target_pid_to_str (ptid_of (thr)), | |
1306 | save_errno ? strerror (save_errno) : "OK"); | |
1307 | } | |
da84f473 PA |
1308 | } |
1309 | ||
e76126e8 PA |
1310 | /* Kill LWP and wait for it to die. */ |
1311 | ||
1312 | static void | |
1313 | kill_wait_lwp (struct lwp_info *lwp) | |
1314 | { | |
1315 | struct thread_info *thr = get_lwp_thread (lwp); | |
1316 | int pid = ptid_get_pid (ptid_of (thr)); | |
1317 | int lwpid = ptid_get_lwp (ptid_of (thr)); | |
1318 | int wstat; | |
1319 | int res; | |
1320 | ||
1321 | if (debug_threads) | |
1322 | debug_printf ("kwl: killing lwp %d, for pid: %d\n", lwpid, pid); | |
1323 | ||
1324 | do | |
1325 | { | |
1326 | linux_kill_one_lwp (lwp); | |
1327 | ||
1328 | /* Make sure it died. Notes: | |
1329 | ||
1330 | - The loop is most likely unnecessary. | |
1331 | ||
1332 | - We don't use linux_wait_for_event as that could delete lwps | |
1333 | while we're iterating over them. We're not interested in | |
1334 | any pending status at this point, only in making sure all | |
1335 | wait status on the kernel side are collected until the | |
1336 | process is reaped. | |
1337 | ||
1338 | - We don't use __WALL here as the __WALL emulation relies on | |
1339 | SIGCHLD, and killing a stopped process doesn't generate | |
1340 | one, nor an exit status. | |
1341 | */ | |
1342 | res = my_waitpid (lwpid, &wstat, 0); | |
1343 | if (res == -1 && errno == ECHILD) | |
1344 | res = my_waitpid (lwpid, &wstat, __WCLONE); | |
1345 | } while (res > 0 && WIFSTOPPED (wstat)); | |
1346 | ||
586b02a9 PA |
1347 | /* Even if it was stopped, the child may have already disappeared. |
1348 | E.g., if it was killed by SIGKILL. */ | |
1349 | if (res < 0 && errno != ECHILD) | |
1350 | perror_with_name ("kill_wait_lwp"); | |
e76126e8 PA |
1351 | } |
1352 | ||
da84f473 PA |
1353 | /* Callback for `find_inferior'. Kills an lwp of a given process, |
1354 | except the leader. */ | |
95954743 PA |
1355 | |
1356 | static int | |
da84f473 | 1357 | kill_one_lwp_callback (struct inferior_list_entry *entry, void *args) |
da6d8c04 | 1358 | { |
0d62e5e8 | 1359 | struct thread_info *thread = (struct thread_info *) entry; |
54a0b537 | 1360 | struct lwp_info *lwp = get_thread_lwp (thread); |
95954743 PA |
1361 | int pid = * (int *) args; |
1362 | ||
1363 | if (ptid_get_pid (entry->id) != pid) | |
1364 | return 0; | |
0d62e5e8 | 1365 | |
fd500816 DJ |
1366 | /* We avoid killing the first thread here, because of a Linux kernel (at |
1367 | least 2.6.0-test7 through 2.6.8-rc4) bug; if we kill the parent before | |
1368 | the children get a chance to be reaped, it will remain a zombie | |
1369 | forever. */ | |
95954743 | 1370 | |
d86d4aaf | 1371 | if (lwpid_of (thread) == pid) |
95954743 PA |
1372 | { |
1373 | if (debug_threads) | |
87ce2a04 DE |
1374 | debug_printf ("lkop: is last of process %s\n", |
1375 | target_pid_to_str (entry->id)); | |
95954743 PA |
1376 | return 0; |
1377 | } | |
fd500816 | 1378 | |
e76126e8 | 1379 | kill_wait_lwp (lwp); |
95954743 | 1380 | return 0; |
da6d8c04 DJ |
1381 | } |
1382 | ||
95954743 PA |
1383 | static int |
1384 | linux_kill (int pid) | |
0d62e5e8 | 1385 | { |
95954743 | 1386 | struct process_info *process; |
54a0b537 | 1387 | struct lwp_info *lwp; |
fd500816 | 1388 | |
95954743 PA |
1389 | process = find_process_pid (pid); |
1390 | if (process == NULL) | |
1391 | return -1; | |
9d606399 | 1392 | |
f9e39928 PA |
1393 | /* If we're killing a running inferior, make sure it is stopped |
1394 | first, as PTRACE_KILL will not work otherwise. */ | |
7984d532 | 1395 | stop_all_lwps (0, NULL); |
f9e39928 | 1396 | |
da84f473 | 1397 | find_inferior (&all_threads, kill_one_lwp_callback , &pid); |
fd500816 | 1398 | |
54a0b537 | 1399 | /* See the comment in linux_kill_one_lwp. We did not kill the first |
fd500816 | 1400 | thread in the list, so do so now. */ |
95954743 | 1401 | lwp = find_lwp_pid (pid_to_ptid (pid)); |
bd99dc85 | 1402 | |
784867a5 | 1403 | if (lwp == NULL) |
fd500816 | 1404 | { |
784867a5 | 1405 | if (debug_threads) |
d86d4aaf DE |
1406 | debug_printf ("lk_1: cannot find lwp for pid: %d\n", |
1407 | pid); | |
784867a5 JK |
1408 | } |
1409 | else | |
e76126e8 | 1410 | kill_wait_lwp (lwp); |
2d717e4f | 1411 | |
8336d594 | 1412 | the_target->mourn (process); |
f9e39928 PA |
1413 | |
1414 | /* Since we presently can only stop all lwps of all processes, we | |
1415 | need to unstop lwps of other processes. */ | |
7984d532 | 1416 | unstop_all_lwps (0, NULL); |
95954743 | 1417 | return 0; |
0d62e5e8 DJ |
1418 | } |
1419 | ||
9b224c5e PA |
1420 | /* Get pending signal of THREAD, for detaching purposes. This is the |
1421 | signal the thread last stopped for, which we need to deliver to the | |
1422 | thread when detaching, otherwise, it'd be suppressed/lost. */ | |
1423 | ||
1424 | static int | |
1425 | get_detach_signal (struct thread_info *thread) | |
1426 | { | |
a493e3e2 | 1427 | enum gdb_signal signo = GDB_SIGNAL_0; |
9b224c5e PA |
1428 | int status; |
1429 | struct lwp_info *lp = get_thread_lwp (thread); | |
1430 | ||
1431 | if (lp->status_pending_p) | |
1432 | status = lp->status_pending; | |
1433 | else | |
1434 | { | |
1435 | /* If the thread had been suspended by gdbserver, and it stopped | |
1436 | cleanly, then it'll have stopped with SIGSTOP. But we don't | |
1437 | want to deliver that SIGSTOP. */ | |
1438 | if (thread->last_status.kind != TARGET_WAITKIND_STOPPED | |
a493e3e2 | 1439 | || thread->last_status.value.sig == GDB_SIGNAL_0) |
9b224c5e PA |
1440 | return 0; |
1441 | ||
1442 | /* Otherwise, we may need to deliver the signal we | |
1443 | intercepted. */ | |
1444 | status = lp->last_status; | |
1445 | } | |
1446 | ||
1447 | if (!WIFSTOPPED (status)) | |
1448 | { | |
1449 | if (debug_threads) | |
87ce2a04 | 1450 | debug_printf ("GPS: lwp %s hasn't stopped: no pending signal\n", |
d86d4aaf | 1451 | target_pid_to_str (ptid_of (thread))); |
9b224c5e PA |
1452 | return 0; |
1453 | } | |
1454 | ||
1455 | /* Extended wait statuses aren't real SIGTRAPs. */ | |
89a5711c | 1456 | if (WSTOPSIG (status) == SIGTRAP && linux_is_extended_waitstatus (status)) |
9b224c5e PA |
1457 | { |
1458 | if (debug_threads) | |
87ce2a04 DE |
1459 | debug_printf ("GPS: lwp %s had stopped with extended " |
1460 | "status: no pending signal\n", | |
d86d4aaf | 1461 | target_pid_to_str (ptid_of (thread))); |
9b224c5e PA |
1462 | return 0; |
1463 | } | |
1464 | ||
2ea28649 | 1465 | signo = gdb_signal_from_host (WSTOPSIG (status)); |
9b224c5e PA |
1466 | |
1467 | if (program_signals_p && !program_signals[signo]) | |
1468 | { | |
1469 | if (debug_threads) | |
87ce2a04 | 1470 | debug_printf ("GPS: lwp %s had signal %s, but it is in nopass state\n", |
d86d4aaf | 1471 | target_pid_to_str (ptid_of (thread)), |
87ce2a04 | 1472 | gdb_signal_to_string (signo)); |
9b224c5e PA |
1473 | return 0; |
1474 | } | |
1475 | else if (!program_signals_p | |
1476 | /* If we have no way to know which signals GDB does not | |
1477 | want to have passed to the program, assume | |
1478 | SIGTRAP/SIGINT, which is GDB's default. */ | |
a493e3e2 | 1479 | && (signo == GDB_SIGNAL_TRAP || signo == GDB_SIGNAL_INT)) |
9b224c5e PA |
1480 | { |
1481 | if (debug_threads) | |
87ce2a04 DE |
1482 | debug_printf ("GPS: lwp %s had signal %s, " |
1483 | "but we don't know if we should pass it. " | |
1484 | "Default to not.\n", | |
d86d4aaf | 1485 | target_pid_to_str (ptid_of (thread)), |
87ce2a04 | 1486 | gdb_signal_to_string (signo)); |
9b224c5e PA |
1487 | return 0; |
1488 | } | |
1489 | else | |
1490 | { | |
1491 | if (debug_threads) | |
87ce2a04 | 1492 | debug_printf ("GPS: lwp %s has pending signal %s: delivering it.\n", |
d86d4aaf | 1493 | target_pid_to_str (ptid_of (thread)), |
87ce2a04 | 1494 | gdb_signal_to_string (signo)); |
9b224c5e PA |
1495 | |
1496 | return WSTOPSIG (status); | |
1497 | } | |
1498 | } | |
1499 | ||
ced2dffb PA |
1500 | /* Detach from LWP. */ |
1501 | ||
1502 | static void | |
1503 | linux_detach_one_lwp (struct lwp_info *lwp) | |
6ad8ae5c | 1504 | { |
ced2dffb | 1505 | struct thread_info *thread = get_lwp_thread (lwp); |
9b224c5e | 1506 | int sig; |
ced2dffb | 1507 | int lwpid; |
6ad8ae5c | 1508 | |
9b224c5e | 1509 | /* If there is a pending SIGSTOP, get rid of it. */ |
54a0b537 | 1510 | if (lwp->stop_expected) |
ae13219e | 1511 | { |
9b224c5e | 1512 | if (debug_threads) |
87ce2a04 | 1513 | debug_printf ("Sending SIGCONT to %s\n", |
d86d4aaf | 1514 | target_pid_to_str (ptid_of (thread))); |
9b224c5e | 1515 | |
d86d4aaf | 1516 | kill_lwp (lwpid_of (thread), SIGCONT); |
54a0b537 | 1517 | lwp->stop_expected = 0; |
ae13219e DJ |
1518 | } |
1519 | ||
9b224c5e PA |
1520 | /* Pass on any pending signal for this thread. */ |
1521 | sig = get_detach_signal (thread); | |
1522 | ||
ced2dffb PA |
1523 | /* Preparing to resume may try to write registers, and fail if the |
1524 | lwp is zombie. If that happens, ignore the error. We'll handle | |
1525 | it below, when detach fails with ESRCH. */ | |
1526 | TRY | |
1527 | { | |
1528 | /* Flush any pending changes to the process's registers. */ | |
1529 | regcache_invalidate_thread (thread); | |
1530 | ||
1531 | /* Finally, let it resume. */ | |
1532 | if (the_low_target.prepare_to_resume != NULL) | |
1533 | the_low_target.prepare_to_resume (lwp); | |
1534 | } | |
1535 | CATCH (ex, RETURN_MASK_ERROR) | |
1536 | { | |
1537 | if (!check_ptrace_stopped_lwp_gone (lwp)) | |
1538 | throw_exception (ex); | |
1539 | } | |
1540 | END_CATCH | |
1541 | ||
1542 | lwpid = lwpid_of (thread); | |
1543 | if (ptrace (PTRACE_DETACH, lwpid, (PTRACE_TYPE_ARG3) 0, | |
b8e1b30e | 1544 | (PTRACE_TYPE_ARG4) (long) sig) < 0) |
ced2dffb PA |
1545 | { |
1546 | int save_errno = errno; | |
1547 | ||
1548 | /* We know the thread exists, so ESRCH must mean the lwp is | |
1549 | zombie. This can happen if one of the already-detached | |
1550 | threads exits the whole thread group. In that case we're | |
1551 | still attached, and must reap the lwp. */ | |
1552 | if (save_errno == ESRCH) | |
1553 | { | |
1554 | int ret, status; | |
1555 | ||
1556 | ret = my_waitpid (lwpid, &status, __WALL); | |
1557 | if (ret == -1) | |
1558 | { | |
1559 | warning (_("Couldn't reap LWP %d while detaching: %s"), | |
1560 | lwpid, strerror (errno)); | |
1561 | } | |
1562 | else if (!WIFEXITED (status) && !WIFSIGNALED (status)) | |
1563 | { | |
1564 | warning (_("Reaping LWP %d while detaching " | |
1565 | "returned unexpected status 0x%x"), | |
1566 | lwpid, status); | |
1567 | } | |
1568 | } | |
1569 | else | |
1570 | { | |
1571 | error (_("Can't detach %s: %s"), | |
1572 | target_pid_to_str (ptid_of (thread)), | |
1573 | strerror (save_errno)); | |
1574 | } | |
1575 | } | |
1576 | else if (debug_threads) | |
1577 | { | |
1578 | debug_printf ("PTRACE_DETACH (%s, %s, 0) (OK)\n", | |
1579 | target_pid_to_str (ptid_of (thread)), | |
1580 | strsignal (sig)); | |
1581 | } | |
bd99dc85 PA |
1582 | |
1583 | delete_lwp (lwp); | |
ced2dffb PA |
1584 | } |
1585 | ||
1586 | /* Callback for find_inferior. Detaches from non-leader threads of a | |
1587 | given process. */ | |
1588 | ||
1589 | static int | |
1590 | linux_detach_lwp_callback (struct inferior_list_entry *entry, void *args) | |
1591 | { | |
1592 | struct thread_info *thread = (struct thread_info *) entry; | |
1593 | struct lwp_info *lwp = get_thread_lwp (thread); | |
1594 | int pid = *(int *) args; | |
1595 | int lwpid = lwpid_of (thread); | |
1596 | ||
1597 | /* Skip other processes. */ | |
1598 | if (ptid_get_pid (entry->id) != pid) | |
1599 | return 0; | |
1600 | ||
1601 | /* We don't actually detach from the thread group leader just yet. | |
1602 | If the thread group exits, we must reap the zombie clone lwps | |
1603 | before we're able to reap the leader. */ | |
1604 | if (ptid_get_pid (entry->id) == lwpid) | |
1605 | return 0; | |
1606 | ||
1607 | linux_detach_one_lwp (lwp); | |
95954743 | 1608 | return 0; |
6ad8ae5c DJ |
1609 | } |
1610 | ||
95954743 PA |
1611 | static int |
1612 | linux_detach (int pid) | |
1613 | { | |
1614 | struct process_info *process; | |
ced2dffb | 1615 | struct lwp_info *main_lwp; |
95954743 PA |
1616 | |
1617 | process = find_process_pid (pid); | |
1618 | if (process == NULL) | |
1619 | return -1; | |
1620 | ||
863d01bd PA |
1621 | /* As there's a step over already in progress, let it finish first, |
1622 | otherwise nesting a stabilize_threads operation on top gets real | |
1623 | messy. */ | |
1624 | complete_ongoing_step_over (); | |
1625 | ||
f9e39928 PA |
1626 | /* Stop all threads before detaching. First, ptrace requires that |
1627 | the thread is stopped to sucessfully detach. Second, thread_db | |
1628 | may need to uninstall thread event breakpoints from memory, which | |
1629 | only works with a stopped process anyway. */ | |
7984d532 | 1630 | stop_all_lwps (0, NULL); |
f9e39928 | 1631 | |
ca5c370d | 1632 | #ifdef USE_THREAD_DB |
8336d594 | 1633 | thread_db_detach (process); |
ca5c370d PA |
1634 | #endif |
1635 | ||
fa593d66 PA |
1636 | /* Stabilize threads (move out of jump pads). */ |
1637 | stabilize_threads (); | |
1638 | ||
ced2dffb PA |
1639 | /* Detach from the clone lwps first. If the thread group exits just |
1640 | while we're detaching, we must reap the clone lwps before we're | |
1641 | able to reap the leader. */ | |
1642 | find_inferior (&all_threads, linux_detach_lwp_callback, &pid); | |
1643 | ||
1644 | main_lwp = find_lwp_pid (pid_to_ptid (pid)); | |
1645 | linux_detach_one_lwp (main_lwp); | |
8336d594 PA |
1646 | |
1647 | the_target->mourn (process); | |
f9e39928 PA |
1648 | |
1649 | /* Since we presently can only stop all lwps of all processes, we | |
1650 | need to unstop lwps of other processes. */ | |
7984d532 | 1651 | unstop_all_lwps (0, NULL); |
f9e39928 PA |
1652 | return 0; |
1653 | } | |
1654 | ||
1655 | /* Remove all LWPs that belong to process PROC from the lwp list. */ | |
1656 | ||
1657 | static int | |
1658 | delete_lwp_callback (struct inferior_list_entry *entry, void *proc) | |
1659 | { | |
d86d4aaf DE |
1660 | struct thread_info *thread = (struct thread_info *) entry; |
1661 | struct lwp_info *lwp = get_thread_lwp (thread); | |
9a3c8263 | 1662 | struct process_info *process = (struct process_info *) proc; |
f9e39928 | 1663 | |
d86d4aaf | 1664 | if (pid_of (thread) == pid_of (process)) |
f9e39928 PA |
1665 | delete_lwp (lwp); |
1666 | ||
dd6953e1 | 1667 | return 0; |
6ad8ae5c DJ |
1668 | } |
1669 | ||
8336d594 PA |
1670 | static void |
1671 | linux_mourn (struct process_info *process) | |
1672 | { | |
1673 | struct process_info_private *priv; | |
1674 | ||
1675 | #ifdef USE_THREAD_DB | |
1676 | thread_db_mourn (process); | |
1677 | #endif | |
1678 | ||
d86d4aaf | 1679 | find_inferior (&all_threads, delete_lwp_callback, process); |
f9e39928 | 1680 | |
8336d594 | 1681 | /* Freeing all private data. */ |
fe978cb0 | 1682 | priv = process->priv; |
8336d594 PA |
1683 | free (priv->arch_private); |
1684 | free (priv); | |
fe978cb0 | 1685 | process->priv = NULL; |
505106cd PA |
1686 | |
1687 | remove_process (process); | |
8336d594 PA |
1688 | } |
1689 | ||
444d6139 | 1690 | static void |
95954743 | 1691 | linux_join (int pid) |
444d6139 | 1692 | { |
444d6139 PA |
1693 | int status, ret; |
1694 | ||
1695 | do { | |
95954743 | 1696 | ret = my_waitpid (pid, &status, 0); |
444d6139 PA |
1697 | if (WIFEXITED (status) || WIFSIGNALED (status)) |
1698 | break; | |
1699 | } while (ret != -1 || errno != ECHILD); | |
1700 | } | |
1701 | ||
6ad8ae5c | 1702 | /* Return nonzero if the given thread is still alive. */ |
0d62e5e8 | 1703 | static int |
95954743 | 1704 | linux_thread_alive (ptid_t ptid) |
0d62e5e8 | 1705 | { |
95954743 PA |
1706 | struct lwp_info *lwp = find_lwp_pid (ptid); |
1707 | ||
1708 | /* We assume we always know if a thread exits. If a whole process | |
1709 | exited but we still haven't been able to report it to GDB, we'll | |
1710 | hold on to the last lwp of the dead process. */ | |
1711 | if (lwp != NULL) | |
00db26fa | 1712 | return !lwp_is_marked_dead (lwp); |
0d62e5e8 DJ |
1713 | else |
1714 | return 0; | |
1715 | } | |
1716 | ||
582511be PA |
1717 | /* Return 1 if this lwp still has an interesting status pending. If |
1718 | not (e.g., it had stopped for a breakpoint that is gone), return | |
1719 | false. */ | |
1720 | ||
1721 | static int | |
1722 | thread_still_has_status_pending_p (struct thread_info *thread) | |
1723 | { | |
1724 | struct lwp_info *lp = get_thread_lwp (thread); | |
1725 | ||
1726 | if (!lp->status_pending_p) | |
1727 | return 0; | |
1728 | ||
582511be | 1729 | if (thread->last_resume_kind != resume_stop |
15c66dd6 PA |
1730 | && (lp->stop_reason == TARGET_STOPPED_BY_SW_BREAKPOINT |
1731 | || lp->stop_reason == TARGET_STOPPED_BY_HW_BREAKPOINT)) | |
582511be PA |
1732 | { |
1733 | struct thread_info *saved_thread; | |
1734 | CORE_ADDR pc; | |
1735 | int discard = 0; | |
1736 | ||
1737 | gdb_assert (lp->last_status != 0); | |
1738 | ||
1739 | pc = get_pc (lp); | |
1740 | ||
1741 | saved_thread = current_thread; | |
1742 | current_thread = thread; | |
1743 | ||
1744 | if (pc != lp->stop_pc) | |
1745 | { | |
1746 | if (debug_threads) | |
1747 | debug_printf ("PC of %ld changed\n", | |
1748 | lwpid_of (thread)); | |
1749 | discard = 1; | |
1750 | } | |
3e572f71 PA |
1751 | |
1752 | #if !USE_SIGTRAP_SIGINFO | |
15c66dd6 | 1753 | else if (lp->stop_reason == TARGET_STOPPED_BY_SW_BREAKPOINT |
582511be PA |
1754 | && !(*the_low_target.breakpoint_at) (pc)) |
1755 | { | |
1756 | if (debug_threads) | |
1757 | debug_printf ("previous SW breakpoint of %ld gone\n", | |
1758 | lwpid_of (thread)); | |
1759 | discard = 1; | |
1760 | } | |
15c66dd6 | 1761 | else if (lp->stop_reason == TARGET_STOPPED_BY_HW_BREAKPOINT |
582511be PA |
1762 | && !hardware_breakpoint_inserted_here (pc)) |
1763 | { | |
1764 | if (debug_threads) | |
1765 | debug_printf ("previous HW breakpoint of %ld gone\n", | |
1766 | lwpid_of (thread)); | |
1767 | discard = 1; | |
1768 | } | |
3e572f71 | 1769 | #endif |
582511be PA |
1770 | |
1771 | current_thread = saved_thread; | |
1772 | ||
1773 | if (discard) | |
1774 | { | |
1775 | if (debug_threads) | |
1776 | debug_printf ("discarding pending breakpoint status\n"); | |
1777 | lp->status_pending_p = 0; | |
1778 | return 0; | |
1779 | } | |
1780 | } | |
1781 | ||
1782 | return 1; | |
1783 | } | |
1784 | ||
a681f9c9 PA |
1785 | /* Returns true if LWP is resumed from the client's perspective. */ |
1786 | ||
1787 | static int | |
1788 | lwp_resumed (struct lwp_info *lwp) | |
1789 | { | |
1790 | struct thread_info *thread = get_lwp_thread (lwp); | |
1791 | ||
1792 | if (thread->last_resume_kind != resume_stop) | |
1793 | return 1; | |
1794 | ||
1795 | /* Did gdb send us a `vCont;t', but we haven't reported the | |
1796 | corresponding stop to gdb yet? If so, the thread is still | |
1797 | resumed/running from gdb's perspective. */ | |
1798 | if (thread->last_resume_kind == resume_stop | |
1799 | && thread->last_status.kind == TARGET_WAITKIND_IGNORE) | |
1800 | return 1; | |
1801 | ||
1802 | return 0; | |
1803 | } | |
1804 | ||
6bf5e0ba | 1805 | /* Return 1 if this lwp has an interesting status pending. */ |
611cb4a5 | 1806 | static int |
d50171e4 | 1807 | status_pending_p_callback (struct inferior_list_entry *entry, void *arg) |
0d62e5e8 | 1808 | { |
d86d4aaf | 1809 | struct thread_info *thread = (struct thread_info *) entry; |
582511be | 1810 | struct lwp_info *lp = get_thread_lwp (thread); |
95954743 PA |
1811 | ptid_t ptid = * (ptid_t *) arg; |
1812 | ||
1813 | /* Check if we're only interested in events from a specific process | |
afa8d396 PA |
1814 | or a specific LWP. */ |
1815 | if (!ptid_match (ptid_of (thread), ptid)) | |
95954743 | 1816 | return 0; |
0d62e5e8 | 1817 | |
a681f9c9 PA |
1818 | if (!lwp_resumed (lp)) |
1819 | return 0; | |
1820 | ||
582511be PA |
1821 | if (lp->status_pending_p |
1822 | && !thread_still_has_status_pending_p (thread)) | |
1823 | { | |
1824 | linux_resume_one_lwp (lp, lp->stepping, GDB_SIGNAL_0, NULL); | |
1825 | return 0; | |
1826 | } | |
0d62e5e8 | 1827 | |
582511be | 1828 | return lp->status_pending_p; |
0d62e5e8 DJ |
1829 | } |
1830 | ||
95954743 PA |
1831 | static int |
1832 | same_lwp (struct inferior_list_entry *entry, void *data) | |
1833 | { | |
1834 | ptid_t ptid = *(ptid_t *) data; | |
1835 | int lwp; | |
1836 | ||
1837 | if (ptid_get_lwp (ptid) != 0) | |
1838 | lwp = ptid_get_lwp (ptid); | |
1839 | else | |
1840 | lwp = ptid_get_pid (ptid); | |
1841 | ||
1842 | if (ptid_get_lwp (entry->id) == lwp) | |
1843 | return 1; | |
1844 | ||
1845 | return 0; | |
1846 | } | |
1847 | ||
1848 | struct lwp_info * | |
1849 | find_lwp_pid (ptid_t ptid) | |
1850 | { | |
d86d4aaf DE |
1851 | struct inferior_list_entry *thread |
1852 | = find_inferior (&all_threads, same_lwp, &ptid); | |
1853 | ||
1854 | if (thread == NULL) | |
1855 | return NULL; | |
1856 | ||
1857 | return get_thread_lwp ((struct thread_info *) thread); | |
95954743 PA |
1858 | } |
1859 | ||
fa96cb38 | 1860 | /* Return the number of known LWPs in the tgid given by PID. */ |
0d62e5e8 | 1861 | |
fa96cb38 PA |
1862 | static int |
1863 | num_lwps (int pid) | |
1864 | { | |
1865 | struct inferior_list_entry *inf, *tmp; | |
1866 | int count = 0; | |
0d62e5e8 | 1867 | |
fa96cb38 | 1868 | ALL_INFERIORS (&all_threads, inf, tmp) |
24a09b5f | 1869 | { |
fa96cb38 PA |
1870 | if (ptid_get_pid (inf->id) == pid) |
1871 | count++; | |
24a09b5f | 1872 | } |
3aee8918 | 1873 | |
fa96cb38 PA |
1874 | return count; |
1875 | } | |
d61ddec4 | 1876 | |
6d4ee8c6 GB |
1877 | /* The arguments passed to iterate_over_lwps. */ |
1878 | ||
1879 | struct iterate_over_lwps_args | |
1880 | { | |
1881 | /* The FILTER argument passed to iterate_over_lwps. */ | |
1882 | ptid_t filter; | |
1883 | ||
1884 | /* The CALLBACK argument passed to iterate_over_lwps. */ | |
1885 | iterate_over_lwps_ftype *callback; | |
1886 | ||
1887 | /* The DATA argument passed to iterate_over_lwps. */ | |
1888 | void *data; | |
1889 | }; | |
1890 | ||
1891 | /* Callback for find_inferior used by iterate_over_lwps to filter | |
1892 | calls to the callback supplied to that function. Returning a | |
1893 | nonzero value causes find_inferiors to stop iterating and return | |
1894 | the current inferior_list_entry. Returning zero indicates that | |
1895 | find_inferiors should continue iterating. */ | |
1896 | ||
1897 | static int | |
1898 | iterate_over_lwps_filter (struct inferior_list_entry *entry, void *args_p) | |
1899 | { | |
1900 | struct iterate_over_lwps_args *args | |
1901 | = (struct iterate_over_lwps_args *) args_p; | |
1902 | ||
1903 | if (ptid_match (entry->id, args->filter)) | |
1904 | { | |
1905 | struct thread_info *thr = (struct thread_info *) entry; | |
1906 | struct lwp_info *lwp = get_thread_lwp (thr); | |
1907 | ||
1908 | return (*args->callback) (lwp, args->data); | |
1909 | } | |
1910 | ||
1911 | return 0; | |
1912 | } | |
1913 | ||
1914 | /* See nat/linux-nat.h. */ | |
1915 | ||
1916 | struct lwp_info * | |
1917 | iterate_over_lwps (ptid_t filter, | |
1918 | iterate_over_lwps_ftype callback, | |
1919 | void *data) | |
1920 | { | |
1921 | struct iterate_over_lwps_args args = {filter, callback, data}; | |
1922 | struct inferior_list_entry *entry; | |
1923 | ||
1924 | entry = find_inferior (&all_threads, iterate_over_lwps_filter, &args); | |
1925 | if (entry == NULL) | |
1926 | return NULL; | |
1927 | ||
1928 | return get_thread_lwp ((struct thread_info *) entry); | |
1929 | } | |
1930 | ||
fa96cb38 PA |
1931 | /* Detect zombie thread group leaders, and "exit" them. We can't reap |
1932 | their exits until all other threads in the group have exited. */ | |
c3adc08c | 1933 | |
fa96cb38 PA |
1934 | static void |
1935 | check_zombie_leaders (void) | |
1936 | { | |
1937 | struct process_info *proc, *tmp; | |
c3adc08c | 1938 | |
fa96cb38 | 1939 | ALL_PROCESSES (proc, tmp) |
c3adc08c | 1940 | { |
fa96cb38 PA |
1941 | pid_t leader_pid = pid_of (proc); |
1942 | struct lwp_info *leader_lp; | |
c3adc08c | 1943 | |
fa96cb38 | 1944 | leader_lp = find_lwp_pid (pid_to_ptid (leader_pid)); |
c3adc08c | 1945 | |
fa96cb38 PA |
1946 | if (debug_threads) |
1947 | debug_printf ("leader_pid=%d, leader_lp!=NULL=%d, " | |
1948 | "num_lwps=%d, zombie=%d\n", | |
1949 | leader_pid, leader_lp!= NULL, num_lwps (leader_pid), | |
1950 | linux_proc_pid_is_zombie (leader_pid)); | |
1951 | ||
94585166 | 1952 | if (leader_lp != NULL && !leader_lp->stopped |
fa96cb38 PA |
1953 | /* Check if there are other threads in the group, as we may |
1954 | have raced with the inferior simply exiting. */ | |
1955 | && !last_thread_of_process_p (leader_pid) | |
1956 | && linux_proc_pid_is_zombie (leader_pid)) | |
1957 | { | |
1958 | /* A leader zombie can mean one of two things: | |
1959 | ||
1960 | - It exited, and there's an exit status pending | |
1961 | available, or only the leader exited (not the whole | |
1962 | program). In the latter case, we can't waitpid the | |
1963 | leader's exit status until all other threads are gone. | |
1964 | ||
1965 | - There are 3 or more threads in the group, and a thread | |
1966 | other than the leader exec'd. On an exec, the Linux | |
1967 | kernel destroys all other threads (except the execing | |
1968 | one) in the thread group, and resets the execing thread's | |
1969 | tid to the tgid. No exit notification is sent for the | |
1970 | execing thread -- from the ptracer's perspective, it | |
1971 | appears as though the execing thread just vanishes. | |
1972 | Until we reap all other threads except the leader and the | |
1973 | execing thread, the leader will be zombie, and the | |
1974 | execing thread will be in `D (disc sleep)'. As soon as | |
1975 | all other threads are reaped, the execing thread changes | |
1976 | it's tid to the tgid, and the previous (zombie) leader | |
1977 | vanishes, giving place to the "new" leader. We could try | |
1978 | distinguishing the exit and exec cases, by waiting once | |
1979 | more, and seeing if something comes out, but it doesn't | |
1980 | sound useful. The previous leader _does_ go away, and | |
1981 | we'll re-add the new one once we see the exec event | |
1982 | (which is just the same as what would happen if the | |
1983 | previous leader did exit voluntarily before some other | |
1984 | thread execs). */ | |
c3adc08c | 1985 | |
fa96cb38 | 1986 | if (debug_threads) |
4eefa7bc PA |
1987 | debug_printf ("CZL: Thread group leader %d zombie " |
1988 | "(it exited, or another thread execd).\n", | |
1989 | leader_pid); | |
c3adc08c | 1990 | |
fa96cb38 | 1991 | delete_lwp (leader_lp); |
c3adc08c PA |
1992 | } |
1993 | } | |
fa96cb38 | 1994 | } |
c3adc08c | 1995 | |
fa96cb38 PA |
1996 | /* Callback for `find_inferior'. Returns the first LWP that is not |
1997 | stopped. ARG is a PTID filter. */ | |
d50171e4 | 1998 | |
fa96cb38 PA |
1999 | static int |
2000 | not_stopped_callback (struct inferior_list_entry *entry, void *arg) | |
2001 | { | |
2002 | struct thread_info *thr = (struct thread_info *) entry; | |
2003 | struct lwp_info *lwp; | |
2004 | ptid_t filter = *(ptid_t *) arg; | |
47c0c975 | 2005 | |
fa96cb38 PA |
2006 | if (!ptid_match (ptid_of (thr), filter)) |
2007 | return 0; | |
bd99dc85 | 2008 | |
fa96cb38 PA |
2009 | lwp = get_thread_lwp (thr); |
2010 | if (!lwp->stopped) | |
2011 | return 1; | |
2012 | ||
2013 | return 0; | |
0d62e5e8 | 2014 | } |
611cb4a5 | 2015 | |
863d01bd PA |
2016 | /* Increment LWP's suspend count. */ |
2017 | ||
2018 | static void | |
2019 | lwp_suspended_inc (struct lwp_info *lwp) | |
2020 | { | |
2021 | lwp->suspended++; | |
2022 | ||
2023 | if (debug_threads && lwp->suspended > 4) | |
2024 | { | |
2025 | struct thread_info *thread = get_lwp_thread (lwp); | |
2026 | ||
2027 | debug_printf ("LWP %ld has a suspiciously high suspend count," | |
2028 | " suspended=%d\n", lwpid_of (thread), lwp->suspended); | |
2029 | } | |
2030 | } | |
2031 | ||
2032 | /* Decrement LWP's suspend count. */ | |
2033 | ||
2034 | static void | |
2035 | lwp_suspended_decr (struct lwp_info *lwp) | |
2036 | { | |
2037 | lwp->suspended--; | |
2038 | ||
2039 | if (lwp->suspended < 0) | |
2040 | { | |
2041 | struct thread_info *thread = get_lwp_thread (lwp); | |
2042 | ||
2043 | internal_error (__FILE__, __LINE__, | |
2044 | "unsuspend LWP %ld, suspended=%d\n", lwpid_of (thread), | |
2045 | lwp->suspended); | |
2046 | } | |
2047 | } | |
2048 | ||
219f2f23 PA |
2049 | /* This function should only be called if the LWP got a SIGTRAP. |
2050 | ||
2051 | Handle any tracepoint steps or hits. Return true if a tracepoint | |
2052 | event was handled, 0 otherwise. */ | |
2053 | ||
2054 | static int | |
2055 | handle_tracepoints (struct lwp_info *lwp) | |
2056 | { | |
2057 | struct thread_info *tinfo = get_lwp_thread (lwp); | |
2058 | int tpoint_related_event = 0; | |
2059 | ||
582511be PA |
2060 | gdb_assert (lwp->suspended == 0); |
2061 | ||
7984d532 PA |
2062 | /* If this tracepoint hit causes a tracing stop, we'll immediately |
2063 | uninsert tracepoints. To do this, we temporarily pause all | |
2064 | threads, unpatch away, and then unpause threads. We need to make | |
2065 | sure the unpausing doesn't resume LWP too. */ | |
863d01bd | 2066 | lwp_suspended_inc (lwp); |
7984d532 | 2067 | |
219f2f23 PA |
2068 | /* And we need to be sure that any all-threads-stopping doesn't try |
2069 | to move threads out of the jump pads, as it could deadlock the | |
2070 | inferior (LWP could be in the jump pad, maybe even holding the | |
2071 | lock.) */ | |
2072 | ||
2073 | /* Do any necessary step collect actions. */ | |
2074 | tpoint_related_event |= tracepoint_finished_step (tinfo, lwp->stop_pc); | |
2075 | ||
fa593d66 PA |
2076 | tpoint_related_event |= handle_tracepoint_bkpts (tinfo, lwp->stop_pc); |
2077 | ||
219f2f23 PA |
2078 | /* See if we just hit a tracepoint and do its main collect |
2079 | actions. */ | |
2080 | tpoint_related_event |= tracepoint_was_hit (tinfo, lwp->stop_pc); | |
2081 | ||
863d01bd | 2082 | lwp_suspended_decr (lwp); |
7984d532 PA |
2083 | |
2084 | gdb_assert (lwp->suspended == 0); | |
229d26fc SM |
2085 | gdb_assert (!stabilizing_threads |
2086 | || (lwp->collecting_fast_tracepoint | |
2087 | != fast_tpoint_collect_result::not_collecting)); | |
7984d532 | 2088 | |
219f2f23 PA |
2089 | if (tpoint_related_event) |
2090 | { | |
2091 | if (debug_threads) | |
87ce2a04 | 2092 | debug_printf ("got a tracepoint event\n"); |
219f2f23 PA |
2093 | return 1; |
2094 | } | |
2095 | ||
2096 | return 0; | |
2097 | } | |
2098 | ||
229d26fc SM |
2099 | /* Convenience wrapper. Returns information about LWP's fast tracepoint |
2100 | collection status. */ | |
fa593d66 | 2101 | |
229d26fc | 2102 | static fast_tpoint_collect_result |
fa593d66 PA |
2103 | linux_fast_tracepoint_collecting (struct lwp_info *lwp, |
2104 | struct fast_tpoint_collect_status *status) | |
2105 | { | |
2106 | CORE_ADDR thread_area; | |
d86d4aaf | 2107 | struct thread_info *thread = get_lwp_thread (lwp); |
fa593d66 PA |
2108 | |
2109 | if (the_low_target.get_thread_area == NULL) | |
229d26fc | 2110 | return fast_tpoint_collect_result::not_collecting; |
fa593d66 PA |
2111 | |
2112 | /* Get the thread area address. This is used to recognize which | |
2113 | thread is which when tracing with the in-process agent library. | |
2114 | We don't read anything from the address, and treat it as opaque; | |
2115 | it's the address itself that we assume is unique per-thread. */ | |
d86d4aaf | 2116 | if ((*the_low_target.get_thread_area) (lwpid_of (thread), &thread_area) == -1) |
229d26fc | 2117 | return fast_tpoint_collect_result::not_collecting; |
fa593d66 PA |
2118 | |
2119 | return fast_tracepoint_collecting (thread_area, lwp->stop_pc, status); | |
2120 | } | |
2121 | ||
2122 | /* The reason we resume in the caller, is because we want to be able | |
2123 | to pass lwp->status_pending as WSTAT, and we need to clear | |
2124 | status_pending_p before resuming, otherwise, linux_resume_one_lwp | |
2125 | refuses to resume. */ | |
2126 | ||
2127 | static int | |
2128 | maybe_move_out_of_jump_pad (struct lwp_info *lwp, int *wstat) | |
2129 | { | |
0bfdf32f | 2130 | struct thread_info *saved_thread; |
fa593d66 | 2131 | |
0bfdf32f GB |
2132 | saved_thread = current_thread; |
2133 | current_thread = get_lwp_thread (lwp); | |
fa593d66 PA |
2134 | |
2135 | if ((wstat == NULL | |
2136 | || (WIFSTOPPED (*wstat) && WSTOPSIG (*wstat) != SIGTRAP)) | |
2137 | && supports_fast_tracepoints () | |
58b4daa5 | 2138 | && agent_loaded_p ()) |
fa593d66 PA |
2139 | { |
2140 | struct fast_tpoint_collect_status status; | |
fa593d66 PA |
2141 | |
2142 | if (debug_threads) | |
87ce2a04 DE |
2143 | debug_printf ("Checking whether LWP %ld needs to move out of the " |
2144 | "jump pad.\n", | |
0bfdf32f | 2145 | lwpid_of (current_thread)); |
fa593d66 | 2146 | |
229d26fc SM |
2147 | fast_tpoint_collect_result r |
2148 | = linux_fast_tracepoint_collecting (lwp, &status); | |
fa593d66 PA |
2149 | |
2150 | if (wstat == NULL | |
2151 | || (WSTOPSIG (*wstat) != SIGILL | |
2152 | && WSTOPSIG (*wstat) != SIGFPE | |
2153 | && WSTOPSIG (*wstat) != SIGSEGV | |
2154 | && WSTOPSIG (*wstat) != SIGBUS)) | |
2155 | { | |
2156 | lwp->collecting_fast_tracepoint = r; | |
2157 | ||
229d26fc | 2158 | if (r != fast_tpoint_collect_result::not_collecting) |
fa593d66 | 2159 | { |
229d26fc SM |
2160 | if (r == fast_tpoint_collect_result::before_insn |
2161 | && lwp->exit_jump_pad_bkpt == NULL) | |
fa593d66 PA |
2162 | { |
2163 | /* Haven't executed the original instruction yet. | |
2164 | Set breakpoint there, and wait till it's hit, | |
2165 | then single-step until exiting the jump pad. */ | |
2166 | lwp->exit_jump_pad_bkpt | |
2167 | = set_breakpoint_at (status.adjusted_insn_addr, NULL); | |
2168 | } | |
2169 | ||
2170 | if (debug_threads) | |
87ce2a04 DE |
2171 | debug_printf ("Checking whether LWP %ld needs to move out of " |
2172 | "the jump pad...it does\n", | |
0bfdf32f GB |
2173 | lwpid_of (current_thread)); |
2174 | current_thread = saved_thread; | |
fa593d66 PA |
2175 | |
2176 | return 1; | |
2177 | } | |
2178 | } | |
2179 | else | |
2180 | { | |
2181 | /* If we get a synchronous signal while collecting, *and* | |
2182 | while executing the (relocated) original instruction, | |
2183 | reset the PC to point at the tpoint address, before | |
2184 | reporting to GDB. Otherwise, it's an IPA lib bug: just | |
2185 | report the signal to GDB, and pray for the best. */ | |
2186 | ||
229d26fc SM |
2187 | lwp->collecting_fast_tracepoint |
2188 | = fast_tpoint_collect_result::not_collecting; | |
fa593d66 | 2189 | |
229d26fc | 2190 | if (r != fast_tpoint_collect_result::not_collecting |
fa593d66 PA |
2191 | && (status.adjusted_insn_addr <= lwp->stop_pc |
2192 | && lwp->stop_pc < status.adjusted_insn_addr_end)) | |
2193 | { | |
2194 | siginfo_t info; | |
2195 | struct regcache *regcache; | |
2196 | ||
2197 | /* The si_addr on a few signals references the address | |
2198 | of the faulting instruction. Adjust that as | |
2199 | well. */ | |
2200 | if ((WSTOPSIG (*wstat) == SIGILL | |
2201 | || WSTOPSIG (*wstat) == SIGFPE | |
2202 | || WSTOPSIG (*wstat) == SIGBUS | |
2203 | || WSTOPSIG (*wstat) == SIGSEGV) | |
0bfdf32f | 2204 | && ptrace (PTRACE_GETSIGINFO, lwpid_of (current_thread), |
b8e1b30e | 2205 | (PTRACE_TYPE_ARG3) 0, &info) == 0 |
fa593d66 PA |
2206 | /* Final check just to make sure we don't clobber |
2207 | the siginfo of non-kernel-sent signals. */ | |
2208 | && (uintptr_t) info.si_addr == lwp->stop_pc) | |
2209 | { | |
2210 | info.si_addr = (void *) (uintptr_t) status.tpoint_addr; | |
0bfdf32f | 2211 | ptrace (PTRACE_SETSIGINFO, lwpid_of (current_thread), |
b8e1b30e | 2212 | (PTRACE_TYPE_ARG3) 0, &info); |
fa593d66 PA |
2213 | } |
2214 | ||
0bfdf32f | 2215 | regcache = get_thread_regcache (current_thread, 1); |
fa593d66 PA |
2216 | (*the_low_target.set_pc) (regcache, status.tpoint_addr); |
2217 | lwp->stop_pc = status.tpoint_addr; | |
2218 | ||
2219 | /* Cancel any fast tracepoint lock this thread was | |
2220 | holding. */ | |
2221 | force_unlock_trace_buffer (); | |
2222 | } | |
2223 | ||
2224 | if (lwp->exit_jump_pad_bkpt != NULL) | |
2225 | { | |
2226 | if (debug_threads) | |
87ce2a04 DE |
2227 | debug_printf ("Cancelling fast exit-jump-pad: removing bkpt. " |
2228 | "stopping all threads momentarily.\n"); | |
fa593d66 PA |
2229 | |
2230 | stop_all_lwps (1, lwp); | |
fa593d66 PA |
2231 | |
2232 | delete_breakpoint (lwp->exit_jump_pad_bkpt); | |
2233 | lwp->exit_jump_pad_bkpt = NULL; | |
2234 | ||
2235 | unstop_all_lwps (1, lwp); | |
2236 | ||
2237 | gdb_assert (lwp->suspended >= 0); | |
2238 | } | |
2239 | } | |
2240 | } | |
2241 | ||
2242 | if (debug_threads) | |
87ce2a04 DE |
2243 | debug_printf ("Checking whether LWP %ld needs to move out of the " |
2244 | "jump pad...no\n", | |
0bfdf32f | 2245 | lwpid_of (current_thread)); |
0cccb683 | 2246 | |
0bfdf32f | 2247 | current_thread = saved_thread; |
fa593d66 PA |
2248 | return 0; |
2249 | } | |
2250 | ||
2251 | /* Enqueue one signal in the "signals to report later when out of the | |
2252 | jump pad" list. */ | |
2253 | ||
2254 | static void | |
2255 | enqueue_one_deferred_signal (struct lwp_info *lwp, int *wstat) | |
2256 | { | |
2257 | struct pending_signals *p_sig; | |
d86d4aaf | 2258 | struct thread_info *thread = get_lwp_thread (lwp); |
fa593d66 PA |
2259 | |
2260 | if (debug_threads) | |
87ce2a04 | 2261 | debug_printf ("Deferring signal %d for LWP %ld.\n", |
d86d4aaf | 2262 | WSTOPSIG (*wstat), lwpid_of (thread)); |
fa593d66 PA |
2263 | |
2264 | if (debug_threads) | |
2265 | { | |
2266 | struct pending_signals *sig; | |
2267 | ||
2268 | for (sig = lwp->pending_signals_to_report; | |
2269 | sig != NULL; | |
2270 | sig = sig->prev) | |
87ce2a04 DE |
2271 | debug_printf (" Already queued %d\n", |
2272 | sig->signal); | |
fa593d66 | 2273 | |
87ce2a04 | 2274 | debug_printf (" (no more currently queued signals)\n"); |
fa593d66 PA |
2275 | } |
2276 | ||
1a981360 PA |
2277 | /* Don't enqueue non-RT signals if they are already in the deferred |
2278 | queue. (SIGSTOP being the easiest signal to see ending up here | |
2279 | twice) */ | |
2280 | if (WSTOPSIG (*wstat) < __SIGRTMIN) | |
2281 | { | |
2282 | struct pending_signals *sig; | |
2283 | ||
2284 | for (sig = lwp->pending_signals_to_report; | |
2285 | sig != NULL; | |
2286 | sig = sig->prev) | |
2287 | { | |
2288 | if (sig->signal == WSTOPSIG (*wstat)) | |
2289 | { | |
2290 | if (debug_threads) | |
87ce2a04 DE |
2291 | debug_printf ("Not requeuing already queued non-RT signal %d" |
2292 | " for LWP %ld\n", | |
2293 | sig->signal, | |
d86d4aaf | 2294 | lwpid_of (thread)); |
1a981360 PA |
2295 | return; |
2296 | } | |
2297 | } | |
2298 | } | |
2299 | ||
8d749320 | 2300 | p_sig = XCNEW (struct pending_signals); |
fa593d66 PA |
2301 | p_sig->prev = lwp->pending_signals_to_report; |
2302 | p_sig->signal = WSTOPSIG (*wstat); | |
8d749320 | 2303 | |
d86d4aaf | 2304 | ptrace (PTRACE_GETSIGINFO, lwpid_of (thread), (PTRACE_TYPE_ARG3) 0, |
56f7af9c | 2305 | &p_sig->info); |
fa593d66 PA |
2306 | |
2307 | lwp->pending_signals_to_report = p_sig; | |
2308 | } | |
2309 | ||
2310 | /* Dequeue one signal from the "signals to report later when out of | |
2311 | the jump pad" list. */ | |
2312 | ||
2313 | static int | |
2314 | dequeue_one_deferred_signal (struct lwp_info *lwp, int *wstat) | |
2315 | { | |
d86d4aaf DE |
2316 | struct thread_info *thread = get_lwp_thread (lwp); |
2317 | ||
fa593d66 PA |
2318 | if (lwp->pending_signals_to_report != NULL) |
2319 | { | |
2320 | struct pending_signals **p_sig; | |
2321 | ||
2322 | p_sig = &lwp->pending_signals_to_report; | |
2323 | while ((*p_sig)->prev != NULL) | |
2324 | p_sig = &(*p_sig)->prev; | |
2325 | ||
2326 | *wstat = W_STOPCODE ((*p_sig)->signal); | |
2327 | if ((*p_sig)->info.si_signo != 0) | |
d86d4aaf | 2328 | ptrace (PTRACE_SETSIGINFO, lwpid_of (thread), (PTRACE_TYPE_ARG3) 0, |
56f7af9c | 2329 | &(*p_sig)->info); |
fa593d66 PA |
2330 | free (*p_sig); |
2331 | *p_sig = NULL; | |
2332 | ||
2333 | if (debug_threads) | |
87ce2a04 | 2334 | debug_printf ("Reporting deferred signal %d for LWP %ld.\n", |
d86d4aaf | 2335 | WSTOPSIG (*wstat), lwpid_of (thread)); |
fa593d66 PA |
2336 | |
2337 | if (debug_threads) | |
2338 | { | |
2339 | struct pending_signals *sig; | |
2340 | ||
2341 | for (sig = lwp->pending_signals_to_report; | |
2342 | sig != NULL; | |
2343 | sig = sig->prev) | |
87ce2a04 DE |
2344 | debug_printf (" Still queued %d\n", |
2345 | sig->signal); | |
fa593d66 | 2346 | |
87ce2a04 | 2347 | debug_printf (" (no more queued signals)\n"); |
fa593d66 PA |
2348 | } |
2349 | ||
2350 | return 1; | |
2351 | } | |
2352 | ||
2353 | return 0; | |
2354 | } | |
2355 | ||
582511be PA |
2356 | /* Fetch the possibly triggered data watchpoint info and store it in |
2357 | CHILD. | |
d50171e4 | 2358 | |
582511be PA |
2359 | On some archs, like x86, that use debug registers to set |
2360 | watchpoints, it's possible that the way to know which watched | |
2361 | address trapped, is to check the register that is used to select | |
2362 | which address to watch. Problem is, between setting the watchpoint | |
2363 | and reading back which data address trapped, the user may change | |
2364 | the set of watchpoints, and, as a consequence, GDB changes the | |
2365 | debug registers in the inferior. To avoid reading back a stale | |
2366 | stopped-data-address when that happens, we cache in LP the fact | |
2367 | that a watchpoint trapped, and the corresponding data address, as | |
2368 | soon as we see CHILD stop with a SIGTRAP. If GDB changes the debug | |
2369 | registers meanwhile, we have the cached data we can rely on. */ | |
d50171e4 | 2370 | |
582511be PA |
2371 | static int |
2372 | check_stopped_by_watchpoint (struct lwp_info *child) | |
2373 | { | |
2374 | if (the_low_target.stopped_by_watchpoint != NULL) | |
d50171e4 | 2375 | { |
582511be | 2376 | struct thread_info *saved_thread; |
d50171e4 | 2377 | |
582511be PA |
2378 | saved_thread = current_thread; |
2379 | current_thread = get_lwp_thread (child); | |
2380 | ||
2381 | if (the_low_target.stopped_by_watchpoint ()) | |
d50171e4 | 2382 | { |
15c66dd6 | 2383 | child->stop_reason = TARGET_STOPPED_BY_WATCHPOINT; |
582511be PA |
2384 | |
2385 | if (the_low_target.stopped_data_address != NULL) | |
2386 | child->stopped_data_address | |
2387 | = the_low_target.stopped_data_address (); | |
2388 | else | |
2389 | child->stopped_data_address = 0; | |
d50171e4 PA |
2390 | } |
2391 | ||
0bfdf32f | 2392 | current_thread = saved_thread; |
d50171e4 PA |
2393 | } |
2394 | ||
15c66dd6 | 2395 | return child->stop_reason == TARGET_STOPPED_BY_WATCHPOINT; |
c4d9ceb6 YQ |
2396 | } |
2397 | ||
de0d863e DB |
2398 | /* Return the ptrace options that we want to try to enable. */ |
2399 | ||
2400 | static int | |
2401 | linux_low_ptrace_options (int attached) | |
2402 | { | |
2403 | int options = 0; | |
2404 | ||
2405 | if (!attached) | |
2406 | options |= PTRACE_O_EXITKILL; | |
2407 | ||
2408 | if (report_fork_events) | |
2409 | options |= PTRACE_O_TRACEFORK; | |
2410 | ||
c269dbdb DB |
2411 | if (report_vfork_events) |
2412 | options |= (PTRACE_O_TRACEVFORK | PTRACE_O_TRACEVFORKDONE); | |
2413 | ||
94585166 DB |
2414 | if (report_exec_events) |
2415 | options |= PTRACE_O_TRACEEXEC; | |
2416 | ||
82075af2 JS |
2417 | options |= PTRACE_O_TRACESYSGOOD; |
2418 | ||
de0d863e DB |
2419 | return options; |
2420 | } | |
2421 | ||
fa96cb38 PA |
2422 | /* Do low-level handling of the event, and check if we should go on |
2423 | and pass it to caller code. Return the affected lwp if we are, or | |
2424 | NULL otherwise. */ | |
2425 | ||
2426 | static struct lwp_info * | |
582511be | 2427 | linux_low_filter_event (int lwpid, int wstat) |
fa96cb38 PA |
2428 | { |
2429 | struct lwp_info *child; | |
2430 | struct thread_info *thread; | |
582511be | 2431 | int have_stop_pc = 0; |
fa96cb38 PA |
2432 | |
2433 | child = find_lwp_pid (pid_to_ptid (lwpid)); | |
2434 | ||
94585166 DB |
2435 | /* Check for stop events reported by a process we didn't already |
2436 | know about - anything not already in our LWP list. | |
2437 | ||
2438 | If we're expecting to receive stopped processes after | |
2439 | fork, vfork, and clone events, then we'll just add the | |
2440 | new one to our list and go back to waiting for the event | |
2441 | to be reported - the stopped process might be returned | |
2442 | from waitpid before or after the event is. | |
2443 | ||
2444 | But note the case of a non-leader thread exec'ing after the | |
2445 | leader having exited, and gone from our lists (because | |
2446 | check_zombie_leaders deleted it). The non-leader thread | |
2447 | changes its tid to the tgid. */ | |
2448 | ||
2449 | if (WIFSTOPPED (wstat) && child == NULL && WSTOPSIG (wstat) == SIGTRAP | |
2450 | && linux_ptrace_get_extended_event (wstat) == PTRACE_EVENT_EXEC) | |
2451 | { | |
2452 | ptid_t child_ptid; | |
2453 | ||
2454 | /* A multi-thread exec after we had seen the leader exiting. */ | |
2455 | if (debug_threads) | |
2456 | { | |
2457 | debug_printf ("LLW: Re-adding thread group leader LWP %d" | |
2458 | "after exec.\n", lwpid); | |
2459 | } | |
2460 | ||
2461 | child_ptid = ptid_build (lwpid, lwpid, 0); | |
2462 | child = add_lwp (child_ptid); | |
2463 | child->stopped = 1; | |
2464 | current_thread = child->thread; | |
2465 | } | |
2466 | ||
fa96cb38 PA |
2467 | /* If we didn't find a process, one of two things presumably happened: |
2468 | - A process we started and then detached from has exited. Ignore it. | |
2469 | - A process we are controlling has forked and the new child's stop | |
2470 | was reported to us by the kernel. Save its PID. */ | |
2471 | if (child == NULL && WIFSTOPPED (wstat)) | |
2472 | { | |
2473 | add_to_pid_list (&stopped_pids, lwpid, wstat); | |
2474 | return NULL; | |
2475 | } | |
2476 | else if (child == NULL) | |
2477 | return NULL; | |
2478 | ||
2479 | thread = get_lwp_thread (child); | |
2480 | ||
2481 | child->stopped = 1; | |
2482 | ||
2483 | child->last_status = wstat; | |
2484 | ||
582511be PA |
2485 | /* Check if the thread has exited. */ |
2486 | if ((WIFEXITED (wstat) || WIFSIGNALED (wstat))) | |
2487 | { | |
2488 | if (debug_threads) | |
2489 | debug_printf ("LLFE: %d exited.\n", lwpid); | |
f50bf8e5 YQ |
2490 | |
2491 | if (finish_step_over (child)) | |
2492 | { | |
2493 | /* Unsuspend all other LWPs, and set them back running again. */ | |
2494 | unsuspend_all_lwps (child); | |
2495 | } | |
2496 | ||
65706a29 PA |
2497 | /* If there is at least one more LWP, then the exit signal was |
2498 | not the end of the debugged application and should be | |
2499 | ignored, unless GDB wants to hear about thread exits. */ | |
2500 | if (report_thread_events | |
2501 | || last_thread_of_process_p (pid_of (thread))) | |
582511be | 2502 | { |
65706a29 PA |
2503 | /* Since events are serialized to GDB core, and we can't |
2504 | report this one right now. Leave the status pending for | |
2505 | the next time we're able to report it. */ | |
2506 | mark_lwp_dead (child, wstat); | |
2507 | return child; | |
582511be PA |
2508 | } |
2509 | else | |
2510 | { | |
65706a29 PA |
2511 | delete_lwp (child); |
2512 | return NULL; | |
582511be PA |
2513 | } |
2514 | } | |
2515 | ||
2516 | gdb_assert (WIFSTOPPED (wstat)); | |
2517 | ||
fa96cb38 PA |
2518 | if (WIFSTOPPED (wstat)) |
2519 | { | |
2520 | struct process_info *proc; | |
2521 | ||
c06cbd92 | 2522 | /* Architecture-specific setup after inferior is running. */ |
fa96cb38 | 2523 | proc = find_process_pid (pid_of (thread)); |
c06cbd92 | 2524 | if (proc->tdesc == NULL) |
fa96cb38 | 2525 | { |
c06cbd92 YQ |
2526 | if (proc->attached) |
2527 | { | |
c06cbd92 YQ |
2528 | /* This needs to happen after we have attached to the |
2529 | inferior and it is stopped for the first time, but | |
2530 | before we access any inferior registers. */ | |
94585166 | 2531 | linux_arch_setup_thread (thread); |
c06cbd92 YQ |
2532 | } |
2533 | else | |
2534 | { | |
2535 | /* The process is started, but GDBserver will do | |
2536 | architecture-specific setup after the program stops at | |
2537 | the first instruction. */ | |
2538 | child->status_pending_p = 1; | |
2539 | child->status_pending = wstat; | |
2540 | return child; | |
2541 | } | |
fa96cb38 PA |
2542 | } |
2543 | } | |
2544 | ||
fa96cb38 PA |
2545 | if (WIFSTOPPED (wstat) && child->must_set_ptrace_flags) |
2546 | { | |
beed38b8 | 2547 | struct process_info *proc = find_process_pid (pid_of (thread)); |
de0d863e | 2548 | int options = linux_low_ptrace_options (proc->attached); |
beed38b8 | 2549 | |
de0d863e | 2550 | linux_enable_event_reporting (lwpid, options); |
fa96cb38 PA |
2551 | child->must_set_ptrace_flags = 0; |
2552 | } | |
2553 | ||
82075af2 JS |
2554 | /* Always update syscall_state, even if it will be filtered later. */ |
2555 | if (WIFSTOPPED (wstat) && WSTOPSIG (wstat) == SYSCALL_SIGTRAP) | |
2556 | { | |
2557 | child->syscall_state | |
2558 | = (child->syscall_state == TARGET_WAITKIND_SYSCALL_ENTRY | |
2559 | ? TARGET_WAITKIND_SYSCALL_RETURN | |
2560 | : TARGET_WAITKIND_SYSCALL_ENTRY); | |
2561 | } | |
2562 | else | |
2563 | { | |
2564 | /* Almost all other ptrace-stops are known to be outside of system | |
2565 | calls, with further exceptions in handle_extended_wait. */ | |
2566 | child->syscall_state = TARGET_WAITKIND_IGNORE; | |
2567 | } | |
2568 | ||
e7ad2f14 PA |
2569 | /* Be careful to not overwrite stop_pc until save_stop_reason is |
2570 | called. */ | |
fa96cb38 | 2571 | if (WIFSTOPPED (wstat) && WSTOPSIG (wstat) == SIGTRAP |
89a5711c | 2572 | && linux_is_extended_waitstatus (wstat)) |
fa96cb38 | 2573 | { |
582511be | 2574 | child->stop_pc = get_pc (child); |
94585166 | 2575 | if (handle_extended_wait (&child, wstat)) |
de0d863e DB |
2576 | { |
2577 | /* The event has been handled, so just return without | |
2578 | reporting it. */ | |
2579 | return NULL; | |
2580 | } | |
fa96cb38 PA |
2581 | } |
2582 | ||
80aea927 | 2583 | if (linux_wstatus_maybe_breakpoint (wstat)) |
582511be | 2584 | { |
e7ad2f14 | 2585 | if (save_stop_reason (child)) |
582511be PA |
2586 | have_stop_pc = 1; |
2587 | } | |
2588 | ||
2589 | if (!have_stop_pc) | |
2590 | child->stop_pc = get_pc (child); | |
2591 | ||
fa96cb38 PA |
2592 | if (WIFSTOPPED (wstat) && WSTOPSIG (wstat) == SIGSTOP |
2593 | && child->stop_expected) | |
2594 | { | |
2595 | if (debug_threads) | |
2596 | debug_printf ("Expected stop.\n"); | |
2597 | child->stop_expected = 0; | |
2598 | ||
2599 | if (thread->last_resume_kind == resume_stop) | |
2600 | { | |
2601 | /* We want to report the stop to the core. Treat the | |
2602 | SIGSTOP as a normal event. */ | |
2bf6fb9d PA |
2603 | if (debug_threads) |
2604 | debug_printf ("LLW: resume_stop SIGSTOP caught for %s.\n", | |
2605 | target_pid_to_str (ptid_of (thread))); | |
fa96cb38 PA |
2606 | } |
2607 | else if (stopping_threads != NOT_STOPPING_THREADS) | |
2608 | { | |
2609 | /* Stopping threads. We don't want this SIGSTOP to end up | |
582511be | 2610 | pending. */ |
2bf6fb9d PA |
2611 | if (debug_threads) |
2612 | debug_printf ("LLW: SIGSTOP caught for %s " | |
2613 | "while stopping threads.\n", | |
2614 | target_pid_to_str (ptid_of (thread))); | |
fa96cb38 PA |
2615 | return NULL; |
2616 | } | |
2617 | else | |
2618 | { | |
2bf6fb9d PA |
2619 | /* This is a delayed SIGSTOP. Filter out the event. */ |
2620 | if (debug_threads) | |
2621 | debug_printf ("LLW: %s %s, 0, 0 (discard delayed SIGSTOP)\n", | |
2622 | child->stepping ? "step" : "continue", | |
2623 | target_pid_to_str (ptid_of (thread))); | |
2624 | ||
fa96cb38 PA |
2625 | linux_resume_one_lwp (child, child->stepping, 0, NULL); |
2626 | return NULL; | |
2627 | } | |
2628 | } | |
2629 | ||
582511be PA |
2630 | child->status_pending_p = 1; |
2631 | child->status_pending = wstat; | |
fa96cb38 PA |
2632 | return child; |
2633 | } | |
2634 | ||
f79b145d YQ |
2635 | /* Return true if THREAD is doing hardware single step. */ |
2636 | ||
2637 | static int | |
2638 | maybe_hw_step (struct thread_info *thread) | |
2639 | { | |
2640 | if (can_hardware_single_step ()) | |
2641 | return 1; | |
2642 | else | |
2643 | { | |
3b9a79ef | 2644 | /* GDBserver must insert single-step breakpoint for software |
f79b145d | 2645 | single step. */ |
3b9a79ef | 2646 | gdb_assert (has_single_step_breakpoints (thread)); |
f79b145d YQ |
2647 | return 0; |
2648 | } | |
2649 | } | |
2650 | ||
20ba1ce6 PA |
2651 | /* Resume LWPs that are currently stopped without any pending status |
2652 | to report, but are resumed from the core's perspective. */ | |
2653 | ||
2654 | static void | |
2655 | resume_stopped_resumed_lwps (struct inferior_list_entry *entry) | |
2656 | { | |
2657 | struct thread_info *thread = (struct thread_info *) entry; | |
2658 | struct lwp_info *lp = get_thread_lwp (thread); | |
2659 | ||
2660 | if (lp->stopped | |
863d01bd | 2661 | && !lp->suspended |
20ba1ce6 | 2662 | && !lp->status_pending_p |
20ba1ce6 PA |
2663 | && thread->last_status.kind == TARGET_WAITKIND_IGNORE) |
2664 | { | |
8901d193 YQ |
2665 | int step = 0; |
2666 | ||
2667 | if (thread->last_resume_kind == resume_step) | |
2668 | step = maybe_hw_step (thread); | |
20ba1ce6 PA |
2669 | |
2670 | if (debug_threads) | |
2671 | debug_printf ("RSRL: resuming stopped-resumed LWP %s at %s: step=%d\n", | |
2672 | target_pid_to_str (ptid_of (thread)), | |
2673 | paddress (lp->stop_pc), | |
2674 | step); | |
2675 | ||
2676 | linux_resume_one_lwp (lp, step, GDB_SIGNAL_0, NULL); | |
2677 | } | |
2678 | } | |
2679 | ||
fa96cb38 PA |
2680 | /* Wait for an event from child(ren) WAIT_PTID, and return any that |
2681 | match FILTER_PTID (leaving others pending). The PTIDs can be: | |
2682 | minus_one_ptid, to specify any child; a pid PTID, specifying all | |
2683 | lwps of a thread group; or a PTID representing a single lwp. Store | |
2684 | the stop status through the status pointer WSTAT. OPTIONS is | |
2685 | passed to the waitpid call. Return 0 if no event was found and | |
2686 | OPTIONS contains WNOHANG. Return -1 if no unwaited-for children | |
2687 | was found. Return the PID of the stopped child otherwise. */ | |
bd99dc85 | 2688 | |
0d62e5e8 | 2689 | static int |
fa96cb38 PA |
2690 | linux_wait_for_event_filtered (ptid_t wait_ptid, ptid_t filter_ptid, |
2691 | int *wstatp, int options) | |
0d62e5e8 | 2692 | { |
d86d4aaf | 2693 | struct thread_info *event_thread; |
d50171e4 | 2694 | struct lwp_info *event_child, *requested_child; |
fa96cb38 | 2695 | sigset_t block_mask, prev_mask; |
d50171e4 | 2696 | |
fa96cb38 | 2697 | retry: |
d86d4aaf DE |
2698 | /* N.B. event_thread points to the thread_info struct that contains |
2699 | event_child. Keep them in sync. */ | |
2700 | event_thread = NULL; | |
d50171e4 PA |
2701 | event_child = NULL; |
2702 | requested_child = NULL; | |
0d62e5e8 | 2703 | |
95954743 | 2704 | /* Check for a lwp with a pending status. */ |
bd99dc85 | 2705 | |
fa96cb38 | 2706 | if (ptid_equal (filter_ptid, minus_one_ptid) || ptid_is_pid (filter_ptid)) |
0d62e5e8 | 2707 | { |
d86d4aaf | 2708 | event_thread = (struct thread_info *) |
89342618 YQ |
2709 | find_inferior_in_random (&all_threads, status_pending_p_callback, |
2710 | &filter_ptid); | |
d86d4aaf DE |
2711 | if (event_thread != NULL) |
2712 | event_child = get_thread_lwp (event_thread); | |
2713 | if (debug_threads && event_thread) | |
2714 | debug_printf ("Got a pending child %ld\n", lwpid_of (event_thread)); | |
0d62e5e8 | 2715 | } |
fa96cb38 | 2716 | else if (!ptid_equal (filter_ptid, null_ptid)) |
0d62e5e8 | 2717 | { |
fa96cb38 | 2718 | requested_child = find_lwp_pid (filter_ptid); |
d50171e4 | 2719 | |
bde24c0a | 2720 | if (stopping_threads == NOT_STOPPING_THREADS |
fa593d66 | 2721 | && requested_child->status_pending_p |
229d26fc SM |
2722 | && (requested_child->collecting_fast_tracepoint |
2723 | != fast_tpoint_collect_result::not_collecting)) | |
fa593d66 PA |
2724 | { |
2725 | enqueue_one_deferred_signal (requested_child, | |
2726 | &requested_child->status_pending); | |
2727 | requested_child->status_pending_p = 0; | |
2728 | requested_child->status_pending = 0; | |
2729 | linux_resume_one_lwp (requested_child, 0, 0, NULL); | |
2730 | } | |
2731 | ||
2732 | if (requested_child->suspended | |
2733 | && requested_child->status_pending_p) | |
38e08fca GB |
2734 | { |
2735 | internal_error (__FILE__, __LINE__, | |
2736 | "requesting an event out of a" | |
2737 | " suspended child?"); | |
2738 | } | |
fa593d66 | 2739 | |
d50171e4 | 2740 | if (requested_child->status_pending_p) |
d86d4aaf DE |
2741 | { |
2742 | event_child = requested_child; | |
2743 | event_thread = get_lwp_thread (event_child); | |
2744 | } | |
0d62e5e8 | 2745 | } |
611cb4a5 | 2746 | |
0d62e5e8 DJ |
2747 | if (event_child != NULL) |
2748 | { | |
bd99dc85 | 2749 | if (debug_threads) |
87ce2a04 | 2750 | debug_printf ("Got an event from pending child %ld (%04x)\n", |
d86d4aaf | 2751 | lwpid_of (event_thread), event_child->status_pending); |
fa96cb38 | 2752 | *wstatp = event_child->status_pending; |
bd99dc85 PA |
2753 | event_child->status_pending_p = 0; |
2754 | event_child->status_pending = 0; | |
0bfdf32f | 2755 | current_thread = event_thread; |
d86d4aaf | 2756 | return lwpid_of (event_thread); |
0d62e5e8 DJ |
2757 | } |
2758 | ||
fa96cb38 PA |
2759 | /* But if we don't find a pending event, we'll have to wait. |
2760 | ||
2761 | We only enter this loop if no process has a pending wait status. | |
2762 | Thus any action taken in response to a wait status inside this | |
2763 | loop is responding as soon as we detect the status, not after any | |
2764 | pending events. */ | |
d8301ad1 | 2765 | |
fa96cb38 PA |
2766 | /* Make sure SIGCHLD is blocked until the sigsuspend below. Block |
2767 | all signals while here. */ | |
2768 | sigfillset (&block_mask); | |
2769 | sigprocmask (SIG_BLOCK, &block_mask, &prev_mask); | |
2770 | ||
582511be PA |
2771 | /* Always pull all events out of the kernel. We'll randomly select |
2772 | an event LWP out of all that have events, to prevent | |
2773 | starvation. */ | |
fa96cb38 | 2774 | while (event_child == NULL) |
0d62e5e8 | 2775 | { |
fa96cb38 | 2776 | pid_t ret = 0; |
0d62e5e8 | 2777 | |
fa96cb38 PA |
2778 | /* Always use -1 and WNOHANG, due to couple of a kernel/ptrace |
2779 | quirks: | |
0d62e5e8 | 2780 | |
fa96cb38 PA |
2781 | - If the thread group leader exits while other threads in the |
2782 | thread group still exist, waitpid(TGID, ...) hangs. That | |
2783 | waitpid won't return an exit status until the other threads | |
2784 | in the group are reaped. | |
611cb4a5 | 2785 | |
fa96cb38 PA |
2786 | - When a non-leader thread execs, that thread just vanishes |
2787 | without reporting an exit (so we'd hang if we waited for it | |
2788 | explicitly in that case). The exec event is reported to | |
94585166 | 2789 | the TGID pid. */ |
fa96cb38 PA |
2790 | errno = 0; |
2791 | ret = my_waitpid (-1, wstatp, options | WNOHANG); | |
d8301ad1 | 2792 | |
fa96cb38 PA |
2793 | if (debug_threads) |
2794 | debug_printf ("LWFE: waitpid(-1, ...) returned %d, %s\n", | |
2795 | ret, errno ? strerror (errno) : "ERRNO-OK"); | |
0d62e5e8 | 2796 | |
fa96cb38 | 2797 | if (ret > 0) |
0d62e5e8 | 2798 | { |
89be2091 | 2799 | if (debug_threads) |
bd99dc85 | 2800 | { |
fa96cb38 PA |
2801 | debug_printf ("LLW: waitpid %ld received %s\n", |
2802 | (long) ret, status_to_str (*wstatp)); | |
bd99dc85 | 2803 | } |
89be2091 | 2804 | |
582511be PA |
2805 | /* Filter all events. IOW, leave all events pending. We'll |
2806 | randomly select an event LWP out of all that have events | |
2807 | below. */ | |
2808 | linux_low_filter_event (ret, *wstatp); | |
fa96cb38 PA |
2809 | /* Retry until nothing comes out of waitpid. A single |
2810 | SIGCHLD can indicate more than one child stopped. */ | |
89be2091 DJ |
2811 | continue; |
2812 | } | |
2813 | ||
20ba1ce6 PA |
2814 | /* Now that we've pulled all events out of the kernel, resume |
2815 | LWPs that don't have an interesting event to report. */ | |
2816 | if (stopping_threads == NOT_STOPPING_THREADS) | |
2817 | for_each_inferior (&all_threads, resume_stopped_resumed_lwps); | |
2818 | ||
2819 | /* ... and find an LWP with a status to report to the core, if | |
2820 | any. */ | |
582511be | 2821 | event_thread = (struct thread_info *) |
89342618 YQ |
2822 | find_inferior_in_random (&all_threads, status_pending_p_callback, |
2823 | &filter_ptid); | |
582511be PA |
2824 | if (event_thread != NULL) |
2825 | { | |
2826 | event_child = get_thread_lwp (event_thread); | |
2827 | *wstatp = event_child->status_pending; | |
2828 | event_child->status_pending_p = 0; | |
2829 | event_child->status_pending = 0; | |
2830 | break; | |
2831 | } | |
2832 | ||
fa96cb38 PA |
2833 | /* Check for zombie thread group leaders. Those can't be reaped |
2834 | until all other threads in the thread group are. */ | |
2835 | check_zombie_leaders (); | |
2836 | ||
2837 | /* If there are no resumed children left in the set of LWPs we | |
2838 | want to wait for, bail. We can't just block in | |
2839 | waitpid/sigsuspend, because lwps might have been left stopped | |
2840 | in trace-stop state, and we'd be stuck forever waiting for | |
2841 | their status to change (which would only happen if we resumed | |
2842 | them). Even if WNOHANG is set, this return code is preferred | |
2843 | over 0 (below), as it is more detailed. */ | |
2844 | if ((find_inferior (&all_threads, | |
2845 | not_stopped_callback, | |
2846 | &wait_ptid) == NULL)) | |
a6dbe5df | 2847 | { |
fa96cb38 PA |
2848 | if (debug_threads) |
2849 | debug_printf ("LLW: exit (no unwaited-for LWP)\n"); | |
2850 | sigprocmask (SIG_SETMASK, &prev_mask, NULL); | |
2851 | return -1; | |
a6dbe5df PA |
2852 | } |
2853 | ||
fa96cb38 PA |
2854 | /* No interesting event to report to the caller. */ |
2855 | if ((options & WNOHANG)) | |
24a09b5f | 2856 | { |
fa96cb38 PA |
2857 | if (debug_threads) |
2858 | debug_printf ("WNOHANG set, no event found\n"); | |
2859 | ||
2860 | sigprocmask (SIG_SETMASK, &prev_mask, NULL); | |
2861 | return 0; | |
24a09b5f DJ |
2862 | } |
2863 | ||
fa96cb38 PA |
2864 | /* Block until we get an event reported with SIGCHLD. */ |
2865 | if (debug_threads) | |
2866 | debug_printf ("sigsuspend'ing\n"); | |
d50171e4 | 2867 | |
fa96cb38 PA |
2868 | sigsuspend (&prev_mask); |
2869 | sigprocmask (SIG_SETMASK, &prev_mask, NULL); | |
2870 | goto retry; | |
2871 | } | |
d50171e4 | 2872 | |
fa96cb38 | 2873 | sigprocmask (SIG_SETMASK, &prev_mask, NULL); |
d50171e4 | 2874 | |
0bfdf32f | 2875 | current_thread = event_thread; |
d50171e4 | 2876 | |
fa96cb38 PA |
2877 | return lwpid_of (event_thread); |
2878 | } | |
2879 | ||
2880 | /* Wait for an event from child(ren) PTID. PTIDs can be: | |
2881 | minus_one_ptid, to specify any child; a pid PTID, specifying all | |
2882 | lwps of a thread group; or a PTID representing a single lwp. Store | |
2883 | the stop status through the status pointer WSTAT. OPTIONS is | |
2884 | passed to the waitpid call. Return 0 if no event was found and | |
2885 | OPTIONS contains WNOHANG. Return -1 if no unwaited-for children | |
2886 | was found. Return the PID of the stopped child otherwise. */ | |
2887 | ||
2888 | static int | |
2889 | linux_wait_for_event (ptid_t ptid, int *wstatp, int options) | |
2890 | { | |
2891 | return linux_wait_for_event_filtered (ptid, ptid, wstatp, options); | |
611cb4a5 DJ |
2892 | } |
2893 | ||
6bf5e0ba PA |
2894 | /* Count the LWP's that have had events. */ |
2895 | ||
2896 | static int | |
2897 | count_events_callback (struct inferior_list_entry *entry, void *data) | |
2898 | { | |
d86d4aaf | 2899 | struct thread_info *thread = (struct thread_info *) entry; |
8bf3b159 | 2900 | struct lwp_info *lp = get_thread_lwp (thread); |
9a3c8263 | 2901 | int *count = (int *) data; |
6bf5e0ba PA |
2902 | |
2903 | gdb_assert (count != NULL); | |
2904 | ||
582511be | 2905 | /* Count only resumed LWPs that have an event pending. */ |
8336d594 | 2906 | if (thread->last_status.kind == TARGET_WAITKIND_IGNORE |
8bf3b159 | 2907 | && lp->status_pending_p) |
6bf5e0ba PA |
2908 | (*count)++; |
2909 | ||
2910 | return 0; | |
2911 | } | |
2912 | ||
2913 | /* Select the LWP (if any) that is currently being single-stepped. */ | |
2914 | ||
2915 | static int | |
2916 | select_singlestep_lwp_callback (struct inferior_list_entry *entry, void *data) | |
2917 | { | |
d86d4aaf DE |
2918 | struct thread_info *thread = (struct thread_info *) entry; |
2919 | struct lwp_info *lp = get_thread_lwp (thread); | |
6bf5e0ba | 2920 | |
8336d594 PA |
2921 | if (thread->last_status.kind == TARGET_WAITKIND_IGNORE |
2922 | && thread->last_resume_kind == resume_step | |
6bf5e0ba PA |
2923 | && lp->status_pending_p) |
2924 | return 1; | |
2925 | else | |
2926 | return 0; | |
2927 | } | |
2928 | ||
b90fc188 | 2929 | /* Select the Nth LWP that has had an event. */ |
6bf5e0ba PA |
2930 | |
2931 | static int | |
2932 | select_event_lwp_callback (struct inferior_list_entry *entry, void *data) | |
2933 | { | |
d86d4aaf | 2934 | struct thread_info *thread = (struct thread_info *) entry; |
8bf3b159 | 2935 | struct lwp_info *lp = get_thread_lwp (thread); |
9a3c8263 | 2936 | int *selector = (int *) data; |
6bf5e0ba PA |
2937 | |
2938 | gdb_assert (selector != NULL); | |
2939 | ||
582511be | 2940 | /* Select only resumed LWPs that have an event pending. */ |
91baf43f | 2941 | if (thread->last_status.kind == TARGET_WAITKIND_IGNORE |
8bf3b159 | 2942 | && lp->status_pending_p) |
6bf5e0ba PA |
2943 | if ((*selector)-- == 0) |
2944 | return 1; | |
2945 | ||
2946 | return 0; | |
2947 | } | |
2948 | ||
6bf5e0ba PA |
2949 | /* Select one LWP out of those that have events pending. */ |
2950 | ||
2951 | static void | |
2952 | select_event_lwp (struct lwp_info **orig_lp) | |
2953 | { | |
2954 | int num_events = 0; | |
2955 | int random_selector; | |
582511be PA |
2956 | struct thread_info *event_thread = NULL; |
2957 | ||
2958 | /* In all-stop, give preference to the LWP that is being | |
2959 | single-stepped. There will be at most one, and it's the LWP that | |
2960 | the core is most interested in. If we didn't do this, then we'd | |
2961 | have to handle pending step SIGTRAPs somehow in case the core | |
2962 | later continues the previously-stepped thread, otherwise we'd | |
2963 | report the pending SIGTRAP, and the core, not having stepped the | |
2964 | thread, wouldn't understand what the trap was for, and therefore | |
2965 | would report it to the user as a random signal. */ | |
2966 | if (!non_stop) | |
6bf5e0ba | 2967 | { |
582511be PA |
2968 | event_thread |
2969 | = (struct thread_info *) find_inferior (&all_threads, | |
2970 | select_singlestep_lwp_callback, | |
2971 | NULL); | |
2972 | if (event_thread != NULL) | |
2973 | { | |
2974 | if (debug_threads) | |
2975 | debug_printf ("SEL: Select single-step %s\n", | |
2976 | target_pid_to_str (ptid_of (event_thread))); | |
2977 | } | |
6bf5e0ba | 2978 | } |
582511be | 2979 | if (event_thread == NULL) |
6bf5e0ba PA |
2980 | { |
2981 | /* No single-stepping LWP. Select one at random, out of those | |
b90fc188 | 2982 | which have had events. */ |
6bf5e0ba | 2983 | |
b90fc188 | 2984 | /* First see how many events we have. */ |
d86d4aaf | 2985 | find_inferior (&all_threads, count_events_callback, &num_events); |
8bf3b159 | 2986 | gdb_assert (num_events > 0); |
6bf5e0ba | 2987 | |
b90fc188 PA |
2988 | /* Now randomly pick a LWP out of those that have had |
2989 | events. */ | |
6bf5e0ba PA |
2990 | random_selector = (int) |
2991 | ((num_events * (double) rand ()) / (RAND_MAX + 1.0)); | |
2992 | ||
2993 | if (debug_threads && num_events > 1) | |
87ce2a04 DE |
2994 | debug_printf ("SEL: Found %d SIGTRAP events, selecting #%d\n", |
2995 | num_events, random_selector); | |
6bf5e0ba | 2996 | |
d86d4aaf DE |
2997 | event_thread |
2998 | = (struct thread_info *) find_inferior (&all_threads, | |
2999 | select_event_lwp_callback, | |
3000 | &random_selector); | |
6bf5e0ba PA |
3001 | } |
3002 | ||
d86d4aaf | 3003 | if (event_thread != NULL) |
6bf5e0ba | 3004 | { |
d86d4aaf DE |
3005 | struct lwp_info *event_lp = get_thread_lwp (event_thread); |
3006 | ||
6bf5e0ba PA |
3007 | /* Switch the event LWP. */ |
3008 | *orig_lp = event_lp; | |
3009 | } | |
3010 | } | |
3011 | ||
7984d532 PA |
3012 | /* Decrement the suspend count of an LWP. */ |
3013 | ||
3014 | static int | |
3015 | unsuspend_one_lwp (struct inferior_list_entry *entry, void *except) | |
3016 | { | |
d86d4aaf DE |
3017 | struct thread_info *thread = (struct thread_info *) entry; |
3018 | struct lwp_info *lwp = get_thread_lwp (thread); | |
7984d532 PA |
3019 | |
3020 | /* Ignore EXCEPT. */ | |
3021 | if (lwp == except) | |
3022 | return 0; | |
3023 | ||
863d01bd | 3024 | lwp_suspended_decr (lwp); |
7984d532 PA |
3025 | return 0; |
3026 | } | |
3027 | ||
3028 | /* Decrement the suspend count of all LWPs, except EXCEPT, if non | |
3029 | NULL. */ | |
3030 | ||
3031 | static void | |
3032 | unsuspend_all_lwps (struct lwp_info *except) | |
3033 | { | |
d86d4aaf | 3034 | find_inferior (&all_threads, unsuspend_one_lwp, except); |
7984d532 PA |
3035 | } |
3036 | ||
fa593d66 PA |
3037 | static void move_out_of_jump_pad_callback (struct inferior_list_entry *entry); |
3038 | static int stuck_in_jump_pad_callback (struct inferior_list_entry *entry, | |
3039 | void *data); | |
3040 | static int lwp_running (struct inferior_list_entry *entry, void *data); | |
3041 | static ptid_t linux_wait_1 (ptid_t ptid, | |
3042 | struct target_waitstatus *ourstatus, | |
3043 | int target_options); | |
3044 | ||
3045 | /* Stabilize threads (move out of jump pads). | |
3046 | ||
3047 | If a thread is midway collecting a fast tracepoint, we need to | |
3048 | finish the collection and move it out of the jump pad before | |
3049 | reporting the signal. | |
3050 | ||
3051 | This avoids recursion while collecting (when a signal arrives | |
3052 | midway, and the signal handler itself collects), which would trash | |
3053 | the trace buffer. In case the user set a breakpoint in a signal | |
3054 | handler, this avoids the backtrace showing the jump pad, etc.. | |
3055 | Most importantly, there are certain things we can't do safely if | |
3056 | threads are stopped in a jump pad (or in its callee's). For | |
3057 | example: | |
3058 | ||
3059 | - starting a new trace run. A thread still collecting the | |
3060 | previous run, could trash the trace buffer when resumed. The trace | |
3061 | buffer control structures would have been reset but the thread had | |
3062 | no way to tell. The thread could even midway memcpy'ing to the | |
3063 | buffer, which would mean that when resumed, it would clobber the | |
3064 | trace buffer that had been set for a new run. | |
3065 | ||
3066 | - we can't rewrite/reuse the jump pads for new tracepoints | |
3067 | safely. Say you do tstart while a thread is stopped midway while | |
3068 | collecting. When the thread is later resumed, it finishes the | |
3069 | collection, and returns to the jump pad, to execute the original | |
3070 | instruction that was under the tracepoint jump at the time the | |
3071 | older run had been started. If the jump pad had been rewritten | |
3072 | since for something else in the new run, the thread would now | |
3073 | execute the wrong / random instructions. */ | |
3074 | ||
3075 | static void | |
3076 | linux_stabilize_threads (void) | |
3077 | { | |
0bfdf32f | 3078 | struct thread_info *saved_thread; |
d86d4aaf | 3079 | struct thread_info *thread_stuck; |
fa593d66 | 3080 | |
d86d4aaf DE |
3081 | thread_stuck |
3082 | = (struct thread_info *) find_inferior (&all_threads, | |
3083 | stuck_in_jump_pad_callback, | |
3084 | NULL); | |
3085 | if (thread_stuck != NULL) | |
fa593d66 | 3086 | { |
b4d51a55 | 3087 | if (debug_threads) |
87ce2a04 | 3088 | debug_printf ("can't stabilize, LWP %ld is stuck in jump pad\n", |
d86d4aaf | 3089 | lwpid_of (thread_stuck)); |
fa593d66 PA |
3090 | return; |
3091 | } | |
3092 | ||
0bfdf32f | 3093 | saved_thread = current_thread; |
fa593d66 PA |
3094 | |
3095 | stabilizing_threads = 1; | |
3096 | ||
3097 | /* Kick 'em all. */ | |
d86d4aaf | 3098 | for_each_inferior (&all_threads, move_out_of_jump_pad_callback); |
fa593d66 PA |
3099 | |
3100 | /* Loop until all are stopped out of the jump pads. */ | |
d86d4aaf | 3101 | while (find_inferior (&all_threads, lwp_running, NULL) != NULL) |
fa593d66 PA |
3102 | { |
3103 | struct target_waitstatus ourstatus; | |
3104 | struct lwp_info *lwp; | |
fa593d66 PA |
3105 | int wstat; |
3106 | ||
3107 | /* Note that we go through the full wait even loop. While | |
3108 | moving threads out of jump pad, we need to be able to step | |
3109 | over internal breakpoints and such. */ | |
32fcada3 | 3110 | linux_wait_1 (minus_one_ptid, &ourstatus, 0); |
fa593d66 PA |
3111 | |
3112 | if (ourstatus.kind == TARGET_WAITKIND_STOPPED) | |
3113 | { | |
0bfdf32f | 3114 | lwp = get_thread_lwp (current_thread); |
fa593d66 PA |
3115 | |
3116 | /* Lock it. */ | |
863d01bd | 3117 | lwp_suspended_inc (lwp); |
fa593d66 | 3118 | |
a493e3e2 | 3119 | if (ourstatus.value.sig != GDB_SIGNAL_0 |
0bfdf32f | 3120 | || current_thread->last_resume_kind == resume_stop) |
fa593d66 | 3121 | { |
2ea28649 | 3122 | wstat = W_STOPCODE (gdb_signal_to_host (ourstatus.value.sig)); |
fa593d66 PA |
3123 | enqueue_one_deferred_signal (lwp, &wstat); |
3124 | } | |
3125 | } | |
3126 | } | |
3127 | ||
fcdad592 | 3128 | unsuspend_all_lwps (NULL); |
fa593d66 PA |
3129 | |
3130 | stabilizing_threads = 0; | |
3131 | ||
0bfdf32f | 3132 | current_thread = saved_thread; |
fa593d66 | 3133 | |
b4d51a55 | 3134 | if (debug_threads) |
fa593d66 | 3135 | { |
d86d4aaf DE |
3136 | thread_stuck |
3137 | = (struct thread_info *) find_inferior (&all_threads, | |
3138 | stuck_in_jump_pad_callback, | |
3139 | NULL); | |
3140 | if (thread_stuck != NULL) | |
87ce2a04 | 3141 | debug_printf ("couldn't stabilize, LWP %ld got stuck in jump pad\n", |
d86d4aaf | 3142 | lwpid_of (thread_stuck)); |
fa593d66 PA |
3143 | } |
3144 | } | |
3145 | ||
582511be PA |
3146 | /* Convenience function that is called when the kernel reports an |
3147 | event that is not passed out to GDB. */ | |
3148 | ||
3149 | static ptid_t | |
3150 | ignore_event (struct target_waitstatus *ourstatus) | |
3151 | { | |
3152 | /* If we got an event, there may still be others, as a single | |
3153 | SIGCHLD can indicate more than one child stopped. This forces | |
3154 | another target_wait call. */ | |
3155 | async_file_mark (); | |
3156 | ||
3157 | ourstatus->kind = TARGET_WAITKIND_IGNORE; | |
3158 | return null_ptid; | |
3159 | } | |
3160 | ||
65706a29 PA |
3161 | /* Convenience function that is called when the kernel reports an exit |
3162 | event. This decides whether to report the event to GDB as a | |
3163 | process exit event, a thread exit event, or to suppress the | |
3164 | event. */ | |
3165 | ||
3166 | static ptid_t | |
3167 | filter_exit_event (struct lwp_info *event_child, | |
3168 | struct target_waitstatus *ourstatus) | |
3169 | { | |
3170 | struct thread_info *thread = get_lwp_thread (event_child); | |
3171 | ptid_t ptid = ptid_of (thread); | |
3172 | ||
3173 | if (!last_thread_of_process_p (pid_of (thread))) | |
3174 | { | |
3175 | if (report_thread_events) | |
3176 | ourstatus->kind = TARGET_WAITKIND_THREAD_EXITED; | |
3177 | else | |
3178 | ourstatus->kind = TARGET_WAITKIND_IGNORE; | |
3179 | ||
3180 | delete_lwp (event_child); | |
3181 | } | |
3182 | return ptid; | |
3183 | } | |
3184 | ||
82075af2 JS |
3185 | /* Returns 1 if GDB is interested in any event_child syscalls. */ |
3186 | ||
3187 | static int | |
3188 | gdb_catching_syscalls_p (struct lwp_info *event_child) | |
3189 | { | |
3190 | struct thread_info *thread = get_lwp_thread (event_child); | |
3191 | struct process_info *proc = get_thread_process (thread); | |
3192 | ||
3193 | return !VEC_empty (int, proc->syscalls_to_catch); | |
3194 | } | |
3195 | ||
3196 | /* Returns 1 if GDB is interested in the event_child syscall. | |
3197 | Only to be called when stopped reason is SYSCALL_SIGTRAP. */ | |
3198 | ||
3199 | static int | |
3200 | gdb_catch_this_syscall_p (struct lwp_info *event_child) | |
3201 | { | |
3202 | int i, iter; | |
4cc32bec | 3203 | int sysno; |
82075af2 JS |
3204 | struct thread_info *thread = get_lwp_thread (event_child); |
3205 | struct process_info *proc = get_thread_process (thread); | |
3206 | ||
3207 | if (VEC_empty (int, proc->syscalls_to_catch)) | |
3208 | return 0; | |
3209 | ||
3210 | if (VEC_index (int, proc->syscalls_to_catch, 0) == ANY_SYSCALL) | |
3211 | return 1; | |
3212 | ||
4cc32bec | 3213 | get_syscall_trapinfo (event_child, &sysno); |
82075af2 JS |
3214 | for (i = 0; |
3215 | VEC_iterate (int, proc->syscalls_to_catch, i, iter); | |
3216 | i++) | |
3217 | if (iter == sysno) | |
3218 | return 1; | |
3219 | ||
3220 | return 0; | |
3221 | } | |
3222 | ||
0d62e5e8 | 3223 | /* Wait for process, returns status. */ |
da6d8c04 | 3224 | |
95954743 PA |
3225 | static ptid_t |
3226 | linux_wait_1 (ptid_t ptid, | |
3227 | struct target_waitstatus *ourstatus, int target_options) | |
da6d8c04 | 3228 | { |
e5f1222d | 3229 | int w; |
fc7238bb | 3230 | struct lwp_info *event_child; |
bd99dc85 | 3231 | int options; |
bd99dc85 | 3232 | int pid; |
6bf5e0ba PA |
3233 | int step_over_finished; |
3234 | int bp_explains_trap; | |
3235 | int maybe_internal_trap; | |
3236 | int report_to_gdb; | |
219f2f23 | 3237 | int trace_event; |
c2d6af84 | 3238 | int in_step_range; |
f2faf941 | 3239 | int any_resumed; |
bd99dc85 | 3240 | |
87ce2a04 DE |
3241 | if (debug_threads) |
3242 | { | |
3243 | debug_enter (); | |
3244 | debug_printf ("linux_wait_1: [%s]\n", target_pid_to_str (ptid)); | |
3245 | } | |
3246 | ||
bd99dc85 PA |
3247 | /* Translate generic target options into linux options. */ |
3248 | options = __WALL; | |
3249 | if (target_options & TARGET_WNOHANG) | |
3250 | options |= WNOHANG; | |
0d62e5e8 | 3251 | |
fa593d66 PA |
3252 | bp_explains_trap = 0; |
3253 | trace_event = 0; | |
c2d6af84 | 3254 | in_step_range = 0; |
bd99dc85 PA |
3255 | ourstatus->kind = TARGET_WAITKIND_IGNORE; |
3256 | ||
f2faf941 PA |
3257 | /* Find a resumed LWP, if any. */ |
3258 | if (find_inferior (&all_threads, | |
3259 | status_pending_p_callback, | |
3260 | &minus_one_ptid) != NULL) | |
3261 | any_resumed = 1; | |
3262 | else if ((find_inferior (&all_threads, | |
3263 | not_stopped_callback, | |
3264 | &minus_one_ptid) != NULL)) | |
3265 | any_resumed = 1; | |
3266 | else | |
3267 | any_resumed = 0; | |
3268 | ||
6bf5e0ba PA |
3269 | if (ptid_equal (step_over_bkpt, null_ptid)) |
3270 | pid = linux_wait_for_event (ptid, &w, options); | |
3271 | else | |
3272 | { | |
3273 | if (debug_threads) | |
87ce2a04 DE |
3274 | debug_printf ("step_over_bkpt set [%s], doing a blocking wait\n", |
3275 | target_pid_to_str (step_over_bkpt)); | |
6bf5e0ba PA |
3276 | pid = linux_wait_for_event (step_over_bkpt, &w, options & ~WNOHANG); |
3277 | } | |
3278 | ||
f2faf941 | 3279 | if (pid == 0 || (pid == -1 && !any_resumed)) |
87ce2a04 | 3280 | { |
fa96cb38 PA |
3281 | gdb_assert (target_options & TARGET_WNOHANG); |
3282 | ||
87ce2a04 DE |
3283 | if (debug_threads) |
3284 | { | |
fa96cb38 PA |
3285 | debug_printf ("linux_wait_1 ret = null_ptid, " |
3286 | "TARGET_WAITKIND_IGNORE\n"); | |
87ce2a04 DE |
3287 | debug_exit (); |
3288 | } | |
fa96cb38 PA |
3289 | |
3290 | ourstatus->kind = TARGET_WAITKIND_IGNORE; | |
87ce2a04 DE |
3291 | return null_ptid; |
3292 | } | |
fa96cb38 PA |
3293 | else if (pid == -1) |
3294 | { | |
3295 | if (debug_threads) | |
3296 | { | |
3297 | debug_printf ("linux_wait_1 ret = null_ptid, " | |
3298 | "TARGET_WAITKIND_NO_RESUMED\n"); | |
3299 | debug_exit (); | |
3300 | } | |
bd99dc85 | 3301 | |
fa96cb38 PA |
3302 | ourstatus->kind = TARGET_WAITKIND_NO_RESUMED; |
3303 | return null_ptid; | |
3304 | } | |
0d62e5e8 | 3305 | |
0bfdf32f | 3306 | event_child = get_thread_lwp (current_thread); |
0d62e5e8 | 3307 | |
fa96cb38 PA |
3308 | /* linux_wait_for_event only returns an exit status for the last |
3309 | child of a process. Report it. */ | |
3310 | if (WIFEXITED (w) || WIFSIGNALED (w)) | |
da6d8c04 | 3311 | { |
fa96cb38 | 3312 | if (WIFEXITED (w)) |
0d62e5e8 | 3313 | { |
fa96cb38 PA |
3314 | ourstatus->kind = TARGET_WAITKIND_EXITED; |
3315 | ourstatus->value.integer = WEXITSTATUS (w); | |
bd99dc85 | 3316 | |
fa96cb38 | 3317 | if (debug_threads) |
bd99dc85 | 3318 | { |
fa96cb38 PA |
3319 | debug_printf ("linux_wait_1 ret = %s, exited with " |
3320 | "retcode %d\n", | |
0bfdf32f | 3321 | target_pid_to_str (ptid_of (current_thread)), |
fa96cb38 PA |
3322 | WEXITSTATUS (w)); |
3323 | debug_exit (); | |
bd99dc85 | 3324 | } |
fa96cb38 PA |
3325 | } |
3326 | else | |
3327 | { | |
3328 | ourstatus->kind = TARGET_WAITKIND_SIGNALLED; | |
3329 | ourstatus->value.sig = gdb_signal_from_host (WTERMSIG (w)); | |
5b1c542e | 3330 | |
fa96cb38 PA |
3331 | if (debug_threads) |
3332 | { | |
3333 | debug_printf ("linux_wait_1 ret = %s, terminated with " | |
3334 | "signal %d\n", | |
0bfdf32f | 3335 | target_pid_to_str (ptid_of (current_thread)), |
fa96cb38 PA |
3336 | WTERMSIG (w)); |
3337 | debug_exit (); | |
3338 | } | |
0d62e5e8 | 3339 | } |
fa96cb38 | 3340 | |
65706a29 PA |
3341 | if (ourstatus->kind == TARGET_WAITKIND_EXITED) |
3342 | return filter_exit_event (event_child, ourstatus); | |
3343 | ||
0bfdf32f | 3344 | return ptid_of (current_thread); |
da6d8c04 DJ |
3345 | } |
3346 | ||
2d97cd35 AT |
3347 | /* If step-over executes a breakpoint instruction, in the case of a |
3348 | hardware single step it means a gdb/gdbserver breakpoint had been | |
3349 | planted on top of a permanent breakpoint, in the case of a software | |
3350 | single step it may just mean that gdbserver hit the reinsert breakpoint. | |
e7ad2f14 | 3351 | The PC has been adjusted by save_stop_reason to point at |
2d97cd35 AT |
3352 | the breakpoint address. |
3353 | So in the case of the hardware single step advance the PC manually | |
3354 | past the breakpoint and in the case of software single step advance only | |
3b9a79ef | 3355 | if it's not the single_step_breakpoint we are hitting. |
2d97cd35 AT |
3356 | This avoids that a program would keep trapping a permanent breakpoint |
3357 | forever. */ | |
8090aef2 | 3358 | if (!ptid_equal (step_over_bkpt, null_ptid) |
2d97cd35 AT |
3359 | && event_child->stop_reason == TARGET_STOPPED_BY_SW_BREAKPOINT |
3360 | && (event_child->stepping | |
3b9a79ef | 3361 | || !single_step_breakpoint_inserted_here (event_child->stop_pc))) |
8090aef2 | 3362 | { |
dd373349 AT |
3363 | int increment_pc = 0; |
3364 | int breakpoint_kind = 0; | |
3365 | CORE_ADDR stop_pc = event_child->stop_pc; | |
3366 | ||
769ef81f AT |
3367 | breakpoint_kind = |
3368 | the_target->breakpoint_kind_from_current_state (&stop_pc); | |
dd373349 | 3369 | the_target->sw_breakpoint_from_kind (breakpoint_kind, &increment_pc); |
8090aef2 PA |
3370 | |
3371 | if (debug_threads) | |
3372 | { | |
3373 | debug_printf ("step-over for %s executed software breakpoint\n", | |
3374 | target_pid_to_str (ptid_of (current_thread))); | |
3375 | } | |
3376 | ||
3377 | if (increment_pc != 0) | |
3378 | { | |
3379 | struct regcache *regcache | |
3380 | = get_thread_regcache (current_thread, 1); | |
3381 | ||
3382 | event_child->stop_pc += increment_pc; | |
3383 | (*the_low_target.set_pc) (regcache, event_child->stop_pc); | |
3384 | ||
3385 | if (!(*the_low_target.breakpoint_at) (event_child->stop_pc)) | |
15c66dd6 | 3386 | event_child->stop_reason = TARGET_STOPPED_BY_NO_REASON; |
8090aef2 PA |
3387 | } |
3388 | } | |
3389 | ||
6bf5e0ba PA |
3390 | /* If this event was not handled before, and is not a SIGTRAP, we |
3391 | report it. SIGILL and SIGSEGV are also treated as traps in case | |
3392 | a breakpoint is inserted at the current PC. If this target does | |
3393 | not support internal breakpoints at all, we also report the | |
3394 | SIGTRAP without further processing; it's of no concern to us. */ | |
3395 | maybe_internal_trap | |
3396 | = (supports_breakpoints () | |
3397 | && (WSTOPSIG (w) == SIGTRAP | |
3398 | || ((WSTOPSIG (w) == SIGILL | |
3399 | || WSTOPSIG (w) == SIGSEGV) | |
3400 | && (*the_low_target.breakpoint_at) (event_child->stop_pc)))); | |
3401 | ||
3402 | if (maybe_internal_trap) | |
3403 | { | |
3404 | /* Handle anything that requires bookkeeping before deciding to | |
3405 | report the event or continue waiting. */ | |
3406 | ||
3407 | /* First check if we can explain the SIGTRAP with an internal | |
3408 | breakpoint, or if we should possibly report the event to GDB. | |
3409 | Do this before anything that may remove or insert a | |
3410 | breakpoint. */ | |
3411 | bp_explains_trap = breakpoint_inserted_here (event_child->stop_pc); | |
3412 | ||
3413 | /* We have a SIGTRAP, possibly a step-over dance has just | |
3414 | finished. If so, tweak the state machine accordingly, | |
3b9a79ef YQ |
3415 | reinsert breakpoints and delete any single-step |
3416 | breakpoints. */ | |
6bf5e0ba PA |
3417 | step_over_finished = finish_step_over (event_child); |
3418 | ||
3419 | /* Now invoke the callbacks of any internal breakpoints there. */ | |
3420 | check_breakpoints (event_child->stop_pc); | |
3421 | ||
219f2f23 PA |
3422 | /* Handle tracepoint data collecting. This may overflow the |
3423 | trace buffer, and cause a tracing stop, removing | |
3424 | breakpoints. */ | |
3425 | trace_event = handle_tracepoints (event_child); | |
3426 | ||
6bf5e0ba PA |
3427 | if (bp_explains_trap) |
3428 | { | |
6bf5e0ba | 3429 | if (debug_threads) |
87ce2a04 | 3430 | debug_printf ("Hit a gdbserver breakpoint.\n"); |
6bf5e0ba PA |
3431 | } |
3432 | } | |
3433 | else | |
3434 | { | |
3435 | /* We have some other signal, possibly a step-over dance was in | |
3436 | progress, and it should be cancelled too. */ | |
3437 | step_over_finished = finish_step_over (event_child); | |
fa593d66 PA |
3438 | } |
3439 | ||
3440 | /* We have all the data we need. Either report the event to GDB, or | |
3441 | resume threads and keep waiting for more. */ | |
3442 | ||
3443 | /* If we're collecting a fast tracepoint, finish the collection and | |
3444 | move out of the jump pad before delivering a signal. See | |
3445 | linux_stabilize_threads. */ | |
3446 | ||
3447 | if (WIFSTOPPED (w) | |
3448 | && WSTOPSIG (w) != SIGTRAP | |
3449 | && supports_fast_tracepoints () | |
58b4daa5 | 3450 | && agent_loaded_p ()) |
fa593d66 PA |
3451 | { |
3452 | if (debug_threads) | |
87ce2a04 DE |
3453 | debug_printf ("Got signal %d for LWP %ld. Check if we need " |
3454 | "to defer or adjust it.\n", | |
0bfdf32f | 3455 | WSTOPSIG (w), lwpid_of (current_thread)); |
fa593d66 PA |
3456 | |
3457 | /* Allow debugging the jump pad itself. */ | |
0bfdf32f | 3458 | if (current_thread->last_resume_kind != resume_step |
fa593d66 PA |
3459 | && maybe_move_out_of_jump_pad (event_child, &w)) |
3460 | { | |
3461 | enqueue_one_deferred_signal (event_child, &w); | |
3462 | ||
3463 | if (debug_threads) | |
87ce2a04 | 3464 | debug_printf ("Signal %d for LWP %ld deferred (in jump pad)\n", |
0bfdf32f | 3465 | WSTOPSIG (w), lwpid_of (current_thread)); |
fa593d66 PA |
3466 | |
3467 | linux_resume_one_lwp (event_child, 0, 0, NULL); | |
582511be | 3468 | |
edeeb602 YQ |
3469 | if (debug_threads) |
3470 | debug_exit (); | |
582511be | 3471 | return ignore_event (ourstatus); |
fa593d66 PA |
3472 | } |
3473 | } | |
219f2f23 | 3474 | |
229d26fc SM |
3475 | if (event_child->collecting_fast_tracepoint |
3476 | != fast_tpoint_collect_result::not_collecting) | |
fa593d66 PA |
3477 | { |
3478 | if (debug_threads) | |
87ce2a04 DE |
3479 | debug_printf ("LWP %ld was trying to move out of the jump pad (%d). " |
3480 | "Check if we're already there.\n", | |
0bfdf32f | 3481 | lwpid_of (current_thread), |
229d26fc | 3482 | (int) event_child->collecting_fast_tracepoint); |
fa593d66 PA |
3483 | |
3484 | trace_event = 1; | |
3485 | ||
3486 | event_child->collecting_fast_tracepoint | |
3487 | = linux_fast_tracepoint_collecting (event_child, NULL); | |
3488 | ||
229d26fc SM |
3489 | if (event_child->collecting_fast_tracepoint |
3490 | != fast_tpoint_collect_result::before_insn) | |
fa593d66 PA |
3491 | { |
3492 | /* No longer need this breakpoint. */ | |
3493 | if (event_child->exit_jump_pad_bkpt != NULL) | |
3494 | { | |
3495 | if (debug_threads) | |
87ce2a04 DE |
3496 | debug_printf ("No longer need exit-jump-pad bkpt; removing it." |
3497 | "stopping all threads momentarily.\n"); | |
fa593d66 PA |
3498 | |
3499 | /* Other running threads could hit this breakpoint. | |
3500 | We don't handle moribund locations like GDB does, | |
3501 | instead we always pause all threads when removing | |
3502 | breakpoints, so that any step-over or | |
3503 | decr_pc_after_break adjustment is always taken | |
3504 | care of while the breakpoint is still | |
3505 | inserted. */ | |
3506 | stop_all_lwps (1, event_child); | |
fa593d66 PA |
3507 | |
3508 | delete_breakpoint (event_child->exit_jump_pad_bkpt); | |
3509 | event_child->exit_jump_pad_bkpt = NULL; | |
3510 | ||
3511 | unstop_all_lwps (1, event_child); | |
3512 | ||
3513 | gdb_assert (event_child->suspended >= 0); | |
3514 | } | |
3515 | } | |
3516 | ||
229d26fc SM |
3517 | if (event_child->collecting_fast_tracepoint |
3518 | == fast_tpoint_collect_result::not_collecting) | |
fa593d66 PA |
3519 | { |
3520 | if (debug_threads) | |
87ce2a04 DE |
3521 | debug_printf ("fast tracepoint finished " |
3522 | "collecting successfully.\n"); | |
fa593d66 PA |
3523 | |
3524 | /* We may have a deferred signal to report. */ | |
3525 | if (dequeue_one_deferred_signal (event_child, &w)) | |
3526 | { | |
3527 | if (debug_threads) | |
87ce2a04 | 3528 | debug_printf ("dequeued one signal.\n"); |
fa593d66 | 3529 | } |
3c11dd79 | 3530 | else |
fa593d66 | 3531 | { |
3c11dd79 | 3532 | if (debug_threads) |
87ce2a04 | 3533 | debug_printf ("no deferred signals.\n"); |
fa593d66 PA |
3534 | |
3535 | if (stabilizing_threads) | |
3536 | { | |
3537 | ourstatus->kind = TARGET_WAITKIND_STOPPED; | |
a493e3e2 | 3538 | ourstatus->value.sig = GDB_SIGNAL_0; |
87ce2a04 DE |
3539 | |
3540 | if (debug_threads) | |
3541 | { | |
3542 | debug_printf ("linux_wait_1 ret = %s, stopped " | |
3543 | "while stabilizing threads\n", | |
0bfdf32f | 3544 | target_pid_to_str (ptid_of (current_thread))); |
87ce2a04 DE |
3545 | debug_exit (); |
3546 | } | |
3547 | ||
0bfdf32f | 3548 | return ptid_of (current_thread); |
fa593d66 PA |
3549 | } |
3550 | } | |
3551 | } | |
6bf5e0ba PA |
3552 | } |
3553 | ||
e471f25b PA |
3554 | /* Check whether GDB would be interested in this event. */ |
3555 | ||
82075af2 JS |
3556 | /* Check if GDB is interested in this syscall. */ |
3557 | if (WIFSTOPPED (w) | |
3558 | && WSTOPSIG (w) == SYSCALL_SIGTRAP | |
3559 | && !gdb_catch_this_syscall_p (event_child)) | |
3560 | { | |
3561 | if (debug_threads) | |
3562 | { | |
3563 | debug_printf ("Ignored syscall for LWP %ld.\n", | |
3564 | lwpid_of (current_thread)); | |
3565 | } | |
3566 | ||
3567 | linux_resume_one_lwp (event_child, event_child->stepping, | |
3568 | 0, NULL); | |
edeeb602 YQ |
3569 | |
3570 | if (debug_threads) | |
3571 | debug_exit (); | |
82075af2 JS |
3572 | return ignore_event (ourstatus); |
3573 | } | |
3574 | ||
e471f25b PA |
3575 | /* If GDB is not interested in this signal, don't stop other |
3576 | threads, and don't report it to GDB. Just resume the inferior | |
3577 | right away. We do this for threading-related signals as well as | |
3578 | any that GDB specifically requested we ignore. But never ignore | |
3579 | SIGSTOP if we sent it ourselves, and do not ignore signals when | |
3580 | stepping - they may require special handling to skip the signal | |
c9587f88 AT |
3581 | handler. Also never ignore signals that could be caused by a |
3582 | breakpoint. */ | |
e471f25b | 3583 | if (WIFSTOPPED (w) |
0bfdf32f | 3584 | && current_thread->last_resume_kind != resume_step |
e471f25b | 3585 | && ( |
1a981360 | 3586 | #if defined (USE_THREAD_DB) && !defined (__ANDROID__) |
fe978cb0 | 3587 | (current_process ()->priv->thread_db != NULL |
e471f25b PA |
3588 | && (WSTOPSIG (w) == __SIGRTMIN |
3589 | || WSTOPSIG (w) == __SIGRTMIN + 1)) | |
3590 | || | |
3591 | #endif | |
2ea28649 | 3592 | (pass_signals[gdb_signal_from_host (WSTOPSIG (w))] |
e471f25b | 3593 | && !(WSTOPSIG (w) == SIGSTOP |
c9587f88 AT |
3594 | && current_thread->last_resume_kind == resume_stop) |
3595 | && !linux_wstatus_maybe_breakpoint (w)))) | |
e471f25b PA |
3596 | { |
3597 | siginfo_t info, *info_p; | |
3598 | ||
3599 | if (debug_threads) | |
87ce2a04 | 3600 | debug_printf ("Ignored signal %d for LWP %ld.\n", |
0bfdf32f | 3601 | WSTOPSIG (w), lwpid_of (current_thread)); |
e471f25b | 3602 | |
0bfdf32f | 3603 | if (ptrace (PTRACE_GETSIGINFO, lwpid_of (current_thread), |
b8e1b30e | 3604 | (PTRACE_TYPE_ARG3) 0, &info) == 0) |
e471f25b PA |
3605 | info_p = &info; |
3606 | else | |
3607 | info_p = NULL; | |
863d01bd PA |
3608 | |
3609 | if (step_over_finished) | |
3610 | { | |
3611 | /* We cancelled this thread's step-over above. We still | |
3612 | need to unsuspend all other LWPs, and set them back | |
3613 | running again while the signal handler runs. */ | |
3614 | unsuspend_all_lwps (event_child); | |
3615 | ||
3616 | /* Enqueue the pending signal info so that proceed_all_lwps | |
3617 | doesn't lose it. */ | |
3618 | enqueue_pending_signal (event_child, WSTOPSIG (w), info_p); | |
3619 | ||
3620 | proceed_all_lwps (); | |
3621 | } | |
3622 | else | |
3623 | { | |
3624 | linux_resume_one_lwp (event_child, event_child->stepping, | |
3625 | WSTOPSIG (w), info_p); | |
3626 | } | |
edeeb602 YQ |
3627 | |
3628 | if (debug_threads) | |
3629 | debug_exit (); | |
3630 | ||
582511be | 3631 | return ignore_event (ourstatus); |
e471f25b PA |
3632 | } |
3633 | ||
c2d6af84 PA |
3634 | /* Note that all addresses are always "out of the step range" when |
3635 | there's no range to begin with. */ | |
3636 | in_step_range = lwp_in_step_range (event_child); | |
3637 | ||
3638 | /* If GDB wanted this thread to single step, and the thread is out | |
3639 | of the step range, we always want to report the SIGTRAP, and let | |
3640 | GDB handle it. Watchpoints should always be reported. So should | |
3641 | signals we can't explain. A SIGTRAP we can't explain could be a | |
3642 | GDB breakpoint --- we may or not support Z0 breakpoints. If we | |
3643 | do, we're be able to handle GDB breakpoints on top of internal | |
3644 | breakpoints, by handling the internal breakpoint and still | |
3645 | reporting the event to GDB. If we don't, we're out of luck, GDB | |
863d01bd PA |
3646 | won't see the breakpoint hit. If we see a single-step event but |
3647 | the thread should be continuing, don't pass the trap to gdb. | |
3648 | That indicates that we had previously finished a single-step but | |
3649 | left the single-step pending -- see | |
3650 | complete_ongoing_step_over. */ | |
6bf5e0ba | 3651 | report_to_gdb = (!maybe_internal_trap |
0bfdf32f | 3652 | || (current_thread->last_resume_kind == resume_step |
c2d6af84 | 3653 | && !in_step_range) |
15c66dd6 | 3654 | || event_child->stop_reason == TARGET_STOPPED_BY_WATCHPOINT |
863d01bd PA |
3655 | || (!in_step_range |
3656 | && !bp_explains_trap | |
3657 | && !trace_event | |
3658 | && !step_over_finished | |
3659 | && !(current_thread->last_resume_kind == resume_continue | |
3660 | && event_child->stop_reason == TARGET_STOPPED_BY_SINGLE_STEP)) | |
9f3a5c85 | 3661 | || (gdb_breakpoint_here (event_child->stop_pc) |
d3ce09f5 | 3662 | && gdb_condition_true_at_breakpoint (event_child->stop_pc) |
de0d863e | 3663 | && gdb_no_commands_at_breakpoint (event_child->stop_pc)) |
00db26fa | 3664 | || event_child->waitstatus.kind != TARGET_WAITKIND_IGNORE); |
d3ce09f5 SS |
3665 | |
3666 | run_breakpoint_commands (event_child->stop_pc); | |
6bf5e0ba PA |
3667 | |
3668 | /* We found no reason GDB would want us to stop. We either hit one | |
3669 | of our own breakpoints, or finished an internal step GDB | |
3670 | shouldn't know about. */ | |
3671 | if (!report_to_gdb) | |
3672 | { | |
3673 | if (debug_threads) | |
3674 | { | |
3675 | if (bp_explains_trap) | |
87ce2a04 | 3676 | debug_printf ("Hit a gdbserver breakpoint.\n"); |
6bf5e0ba | 3677 | if (step_over_finished) |
87ce2a04 | 3678 | debug_printf ("Step-over finished.\n"); |
219f2f23 | 3679 | if (trace_event) |
87ce2a04 | 3680 | debug_printf ("Tracepoint event.\n"); |
c2d6af84 | 3681 | if (lwp_in_step_range (event_child)) |
87ce2a04 DE |
3682 | debug_printf ("Range stepping pc 0x%s [0x%s, 0x%s).\n", |
3683 | paddress (event_child->stop_pc), | |
3684 | paddress (event_child->step_range_start), | |
3685 | paddress (event_child->step_range_end)); | |
6bf5e0ba PA |
3686 | } |
3687 | ||
3688 | /* We're not reporting this breakpoint to GDB, so apply the | |
3689 | decr_pc_after_break adjustment to the inferior's regcache | |
3690 | ourselves. */ | |
3691 | ||
3692 | if (the_low_target.set_pc != NULL) | |
3693 | { | |
3694 | struct regcache *regcache | |
0bfdf32f | 3695 | = get_thread_regcache (current_thread, 1); |
6bf5e0ba PA |
3696 | (*the_low_target.set_pc) (regcache, event_child->stop_pc); |
3697 | } | |
3698 | ||
7984d532 | 3699 | if (step_over_finished) |
e3652c84 YQ |
3700 | { |
3701 | /* If we have finished stepping over a breakpoint, we've | |
3702 | stopped and suspended all LWPs momentarily except the | |
3703 | stepping one. This is where we resume them all again. | |
3704 | We're going to keep waiting, so use proceed, which | |
3705 | handles stepping over the next breakpoint. */ | |
3706 | unsuspend_all_lwps (event_child); | |
3707 | } | |
3708 | else | |
3709 | { | |
3710 | /* Remove the single-step breakpoints if any. Note that | |
3711 | there isn't single-step breakpoint if we finished stepping | |
3712 | over. */ | |
3713 | if (can_software_single_step () | |
3714 | && has_single_step_breakpoints (current_thread)) | |
3715 | { | |
3716 | stop_all_lwps (0, event_child); | |
3717 | delete_single_step_breakpoints (current_thread); | |
3718 | unstop_all_lwps (0, event_child); | |
3719 | } | |
3720 | } | |
7984d532 | 3721 | |
e3652c84 YQ |
3722 | if (debug_threads) |
3723 | debug_printf ("proceeding all threads.\n"); | |
6bf5e0ba | 3724 | proceed_all_lwps (); |
edeeb602 YQ |
3725 | |
3726 | if (debug_threads) | |
3727 | debug_exit (); | |
3728 | ||
582511be | 3729 | return ignore_event (ourstatus); |
6bf5e0ba PA |
3730 | } |
3731 | ||
3732 | if (debug_threads) | |
3733 | { | |
00db26fa | 3734 | if (event_child->waitstatus.kind != TARGET_WAITKIND_IGNORE) |
ad071a30 | 3735 | { |
23fdd69e SM |
3736 | std::string str |
3737 | = target_waitstatus_to_string (&event_child->waitstatus); | |
ad071a30 | 3738 | |
ad071a30 | 3739 | debug_printf ("LWP %ld: extended event with waitstatus %s\n", |
23fdd69e | 3740 | lwpid_of (get_lwp_thread (event_child)), str.c_str ()); |
ad071a30 | 3741 | } |
0bfdf32f | 3742 | if (current_thread->last_resume_kind == resume_step) |
c2d6af84 PA |
3743 | { |
3744 | if (event_child->step_range_start == event_child->step_range_end) | |
87ce2a04 | 3745 | debug_printf ("GDB wanted to single-step, reporting event.\n"); |
c2d6af84 | 3746 | else if (!lwp_in_step_range (event_child)) |
87ce2a04 | 3747 | debug_printf ("Out of step range, reporting event.\n"); |
c2d6af84 | 3748 | } |
15c66dd6 | 3749 | if (event_child->stop_reason == TARGET_STOPPED_BY_WATCHPOINT) |
87ce2a04 | 3750 | debug_printf ("Stopped by watchpoint.\n"); |
582511be | 3751 | else if (gdb_breakpoint_here (event_child->stop_pc)) |
87ce2a04 | 3752 | debug_printf ("Stopped by GDB breakpoint.\n"); |
6bf5e0ba | 3753 | if (debug_threads) |
87ce2a04 | 3754 | debug_printf ("Hit a non-gdbserver trap event.\n"); |
6bf5e0ba PA |
3755 | } |
3756 | ||
3757 | /* Alright, we're going to report a stop. */ | |
3758 | ||
3b9a79ef | 3759 | /* Remove single-step breakpoints. */ |
8901d193 YQ |
3760 | if (can_software_single_step ()) |
3761 | { | |
3b9a79ef | 3762 | /* Remove single-step breakpoints or not. It it is true, stop all |
8901d193 YQ |
3763 | lwps, so that other threads won't hit the breakpoint in the |
3764 | staled memory. */ | |
3b9a79ef | 3765 | int remove_single_step_breakpoints_p = 0; |
8901d193 YQ |
3766 | |
3767 | if (non_stop) | |
3768 | { | |
3b9a79ef YQ |
3769 | remove_single_step_breakpoints_p |
3770 | = has_single_step_breakpoints (current_thread); | |
8901d193 YQ |
3771 | } |
3772 | else | |
3773 | { | |
3774 | /* In all-stop, a stop reply cancels all previous resume | |
3b9a79ef | 3775 | requests. Delete all single-step breakpoints. */ |
8901d193 YQ |
3776 | struct inferior_list_entry *inf, *tmp; |
3777 | ||
3778 | ALL_INFERIORS (&all_threads, inf, tmp) | |
3779 | { | |
3780 | struct thread_info *thread = (struct thread_info *) inf; | |
3781 | ||
3b9a79ef | 3782 | if (has_single_step_breakpoints (thread)) |
8901d193 | 3783 | { |
3b9a79ef | 3784 | remove_single_step_breakpoints_p = 1; |
8901d193 YQ |
3785 | break; |
3786 | } | |
3787 | } | |
3788 | } | |
3789 | ||
3b9a79ef | 3790 | if (remove_single_step_breakpoints_p) |
8901d193 | 3791 | { |
3b9a79ef | 3792 | /* If we remove single-step breakpoints from memory, stop all lwps, |
8901d193 YQ |
3793 | so that other threads won't hit the breakpoint in the staled |
3794 | memory. */ | |
3795 | stop_all_lwps (0, event_child); | |
3796 | ||
3797 | if (non_stop) | |
3798 | { | |
3b9a79ef YQ |
3799 | gdb_assert (has_single_step_breakpoints (current_thread)); |
3800 | delete_single_step_breakpoints (current_thread); | |
8901d193 YQ |
3801 | } |
3802 | else | |
3803 | { | |
3804 | struct inferior_list_entry *inf, *tmp; | |
3805 | ||
3806 | ALL_INFERIORS (&all_threads, inf, tmp) | |
3807 | { | |
3808 | struct thread_info *thread = (struct thread_info *) inf; | |
3809 | ||
3b9a79ef YQ |
3810 | if (has_single_step_breakpoints (thread)) |
3811 | delete_single_step_breakpoints (thread); | |
8901d193 YQ |
3812 | } |
3813 | } | |
3814 | ||
3815 | unstop_all_lwps (0, event_child); | |
3816 | } | |
3817 | } | |
3818 | ||
582511be | 3819 | if (!stabilizing_threads) |
6bf5e0ba PA |
3820 | { |
3821 | /* In all-stop, stop all threads. */ | |
582511be PA |
3822 | if (!non_stop) |
3823 | stop_all_lwps (0, NULL); | |
6bf5e0ba | 3824 | |
c03e6ccc | 3825 | if (step_over_finished) |
582511be PA |
3826 | { |
3827 | if (!non_stop) | |
3828 | { | |
3829 | /* If we were doing a step-over, all other threads but | |
3830 | the stepping one had been paused in start_step_over, | |
3831 | with their suspend counts incremented. We don't want | |
3832 | to do a full unstop/unpause, because we're in | |
3833 | all-stop mode (so we want threads stopped), but we | |
3834 | still need to unsuspend the other threads, to | |
3835 | decrement their `suspended' count back. */ | |
3836 | unsuspend_all_lwps (event_child); | |
3837 | } | |
3838 | else | |
3839 | { | |
3840 | /* If we just finished a step-over, then all threads had | |
3841 | been momentarily paused. In all-stop, that's fine, | |
3842 | we want threads stopped by now anyway. In non-stop, | |
3843 | we need to re-resume threads that GDB wanted to be | |
3844 | running. */ | |
3845 | unstop_all_lwps (1, event_child); | |
3846 | } | |
3847 | } | |
c03e6ccc | 3848 | |
3aa5cfa0 AT |
3849 | /* If we're not waiting for a specific LWP, choose an event LWP |
3850 | from among those that have had events. Giving equal priority | |
3851 | to all LWPs that have had events helps prevent | |
3852 | starvation. */ | |
3853 | if (ptid_equal (ptid, minus_one_ptid)) | |
3854 | { | |
3855 | event_child->status_pending_p = 1; | |
3856 | event_child->status_pending = w; | |
3857 | ||
3858 | select_event_lwp (&event_child); | |
3859 | ||
3860 | /* current_thread and event_child must stay in sync. */ | |
3861 | current_thread = get_lwp_thread (event_child); | |
3862 | ||
3863 | event_child->status_pending_p = 0; | |
3864 | w = event_child->status_pending; | |
3865 | } | |
3866 | ||
3867 | ||
fa593d66 | 3868 | /* Stabilize threads (move out of jump pads). */ |
582511be PA |
3869 | if (!non_stop) |
3870 | stabilize_threads (); | |
6bf5e0ba PA |
3871 | } |
3872 | else | |
3873 | { | |
3874 | /* If we just finished a step-over, then all threads had been | |
3875 | momentarily paused. In all-stop, that's fine, we want | |
3876 | threads stopped by now anyway. In non-stop, we need to | |
3877 | re-resume threads that GDB wanted to be running. */ | |
3878 | if (step_over_finished) | |
7984d532 | 3879 | unstop_all_lwps (1, event_child); |
6bf5e0ba PA |
3880 | } |
3881 | ||
00db26fa | 3882 | if (event_child->waitstatus.kind != TARGET_WAITKIND_IGNORE) |
de0d863e | 3883 | { |
00db26fa PA |
3884 | /* If the reported event is an exit, fork, vfork or exec, let |
3885 | GDB know. */ | |
5a04c4cf PA |
3886 | |
3887 | /* Break the unreported fork relationship chain. */ | |
3888 | if (event_child->waitstatus.kind == TARGET_WAITKIND_FORKED | |
3889 | || event_child->waitstatus.kind == TARGET_WAITKIND_VFORKED) | |
3890 | { | |
3891 | event_child->fork_relative->fork_relative = NULL; | |
3892 | event_child->fork_relative = NULL; | |
3893 | } | |
3894 | ||
00db26fa | 3895 | *ourstatus = event_child->waitstatus; |
de0d863e DB |
3896 | /* Clear the event lwp's waitstatus since we handled it already. */ |
3897 | event_child->waitstatus.kind = TARGET_WAITKIND_IGNORE; | |
3898 | } | |
3899 | else | |
3900 | ourstatus->kind = TARGET_WAITKIND_STOPPED; | |
5b1c542e | 3901 | |
582511be | 3902 | /* Now that we've selected our final event LWP, un-adjust its PC if |
3e572f71 PA |
3903 | it was a software breakpoint, and the client doesn't know we can |
3904 | adjust the breakpoint ourselves. */ | |
3905 | if (event_child->stop_reason == TARGET_STOPPED_BY_SW_BREAKPOINT | |
3906 | && !swbreak_feature) | |
582511be PA |
3907 | { |
3908 | int decr_pc = the_low_target.decr_pc_after_break; | |
3909 | ||
3910 | if (decr_pc != 0) | |
3911 | { | |
3912 | struct regcache *regcache | |
3913 | = get_thread_regcache (current_thread, 1); | |
3914 | (*the_low_target.set_pc) (regcache, event_child->stop_pc + decr_pc); | |
3915 | } | |
3916 | } | |
3917 | ||
82075af2 JS |
3918 | if (WSTOPSIG (w) == SYSCALL_SIGTRAP) |
3919 | { | |
82075af2 | 3920 | get_syscall_trapinfo (event_child, |
4cc32bec | 3921 | &ourstatus->value.syscall_number); |
82075af2 JS |
3922 | ourstatus->kind = event_child->syscall_state; |
3923 | } | |
3924 | else if (current_thread->last_resume_kind == resume_stop | |
3925 | && WSTOPSIG (w) == SIGSTOP) | |
bd99dc85 PA |
3926 | { |
3927 | /* A thread that has been requested to stop by GDB with vCont;t, | |
3928 | and it stopped cleanly, so report as SIG0. The use of | |
3929 | SIGSTOP is an implementation detail. */ | |
a493e3e2 | 3930 | ourstatus->value.sig = GDB_SIGNAL_0; |
bd99dc85 | 3931 | } |
0bfdf32f | 3932 | else if (current_thread->last_resume_kind == resume_stop |
8336d594 | 3933 | && WSTOPSIG (w) != SIGSTOP) |
bd99dc85 PA |
3934 | { |
3935 | /* A thread that has been requested to stop by GDB with vCont;t, | |
d50171e4 | 3936 | but, it stopped for other reasons. */ |
2ea28649 | 3937 | ourstatus->value.sig = gdb_signal_from_host (WSTOPSIG (w)); |
bd99dc85 | 3938 | } |
de0d863e | 3939 | else if (ourstatus->kind == TARGET_WAITKIND_STOPPED) |
bd99dc85 | 3940 | { |
2ea28649 | 3941 | ourstatus->value.sig = gdb_signal_from_host (WSTOPSIG (w)); |
bd99dc85 PA |
3942 | } |
3943 | ||
d50171e4 PA |
3944 | gdb_assert (ptid_equal (step_over_bkpt, null_ptid)); |
3945 | ||
bd99dc85 | 3946 | if (debug_threads) |
87ce2a04 DE |
3947 | { |
3948 | debug_printf ("linux_wait_1 ret = %s, %d, %d\n", | |
0bfdf32f | 3949 | target_pid_to_str (ptid_of (current_thread)), |
87ce2a04 DE |
3950 | ourstatus->kind, ourstatus->value.sig); |
3951 | debug_exit (); | |
3952 | } | |
bd99dc85 | 3953 | |
65706a29 PA |
3954 | if (ourstatus->kind == TARGET_WAITKIND_EXITED) |
3955 | return filter_exit_event (event_child, ourstatus); | |
3956 | ||
0bfdf32f | 3957 | return ptid_of (current_thread); |
bd99dc85 PA |
3958 | } |
3959 | ||
3960 | /* Get rid of any pending event in the pipe. */ | |
3961 | static void | |
3962 | async_file_flush (void) | |
3963 | { | |
3964 | int ret; | |
3965 | char buf; | |
3966 | ||
3967 | do | |
3968 | ret = read (linux_event_pipe[0], &buf, 1); | |
3969 | while (ret >= 0 || (ret == -1 && errno == EINTR)); | |
3970 | } | |
3971 | ||
3972 | /* Put something in the pipe, so the event loop wakes up. */ | |
3973 | static void | |
3974 | async_file_mark (void) | |
3975 | { | |
3976 | int ret; | |
3977 | ||
3978 | async_file_flush (); | |
3979 | ||
3980 | do | |
3981 | ret = write (linux_event_pipe[1], "+", 1); | |
3982 | while (ret == 0 || (ret == -1 && errno == EINTR)); | |
3983 | ||
3984 | /* Ignore EAGAIN. If the pipe is full, the event loop will already | |
3985 | be awakened anyway. */ | |
3986 | } | |
3987 | ||
95954743 PA |
3988 | static ptid_t |
3989 | linux_wait (ptid_t ptid, | |
3990 | struct target_waitstatus *ourstatus, int target_options) | |
bd99dc85 | 3991 | { |
95954743 | 3992 | ptid_t event_ptid; |
bd99dc85 | 3993 | |
bd99dc85 PA |
3994 | /* Flush the async file first. */ |
3995 | if (target_is_async_p ()) | |
3996 | async_file_flush (); | |
3997 | ||
582511be PA |
3998 | do |
3999 | { | |
4000 | event_ptid = linux_wait_1 (ptid, ourstatus, target_options); | |
4001 | } | |
4002 | while ((target_options & TARGET_WNOHANG) == 0 | |
4003 | && ptid_equal (event_ptid, null_ptid) | |
4004 | && ourstatus->kind == TARGET_WAITKIND_IGNORE); | |
bd99dc85 PA |
4005 | |
4006 | /* If at least one stop was reported, there may be more. A single | |
4007 | SIGCHLD can signal more than one child stop. */ | |
4008 | if (target_is_async_p () | |
4009 | && (target_options & TARGET_WNOHANG) != 0 | |
95954743 | 4010 | && !ptid_equal (event_ptid, null_ptid)) |
bd99dc85 PA |
4011 | async_file_mark (); |
4012 | ||
4013 | return event_ptid; | |
da6d8c04 DJ |
4014 | } |
4015 | ||
c5f62d5f | 4016 | /* Send a signal to an LWP. */ |
fd500816 DJ |
4017 | |
4018 | static int | |
a1928bad | 4019 | kill_lwp (unsigned long lwpid, int signo) |
fd500816 | 4020 | { |
4a6ed09b | 4021 | int ret; |
fd500816 | 4022 | |
4a6ed09b PA |
4023 | errno = 0; |
4024 | ret = syscall (__NR_tkill, lwpid, signo); | |
4025 | if (errno == ENOSYS) | |
4026 | { | |
4027 | /* If tkill fails, then we are not using nptl threads, a | |
4028 | configuration we no longer support. */ | |
4029 | perror_with_name (("tkill")); | |
4030 | } | |
4031 | return ret; | |
fd500816 DJ |
4032 | } |
4033 | ||
964e4306 PA |
4034 | void |
4035 | linux_stop_lwp (struct lwp_info *lwp) | |
4036 | { | |
4037 | send_sigstop (lwp); | |
4038 | } | |
4039 | ||
0d62e5e8 | 4040 | static void |
02fc4de7 | 4041 | send_sigstop (struct lwp_info *lwp) |
0d62e5e8 | 4042 | { |
bd99dc85 | 4043 | int pid; |
0d62e5e8 | 4044 | |
d86d4aaf | 4045 | pid = lwpid_of (get_lwp_thread (lwp)); |
bd99dc85 | 4046 | |
0d62e5e8 DJ |
4047 | /* If we already have a pending stop signal for this process, don't |
4048 | send another. */ | |
54a0b537 | 4049 | if (lwp->stop_expected) |
0d62e5e8 | 4050 | { |
ae13219e | 4051 | if (debug_threads) |
87ce2a04 | 4052 | debug_printf ("Have pending sigstop for lwp %d\n", pid); |
ae13219e | 4053 | |
0d62e5e8 DJ |
4054 | return; |
4055 | } | |
4056 | ||
4057 | if (debug_threads) | |
87ce2a04 | 4058 | debug_printf ("Sending sigstop to lwp %d\n", pid); |
0d62e5e8 | 4059 | |
d50171e4 | 4060 | lwp->stop_expected = 1; |
bd99dc85 | 4061 | kill_lwp (pid, SIGSTOP); |
0d62e5e8 DJ |
4062 | } |
4063 | ||
7984d532 PA |
4064 | static int |
4065 | send_sigstop_callback (struct inferior_list_entry *entry, void *except) | |
02fc4de7 | 4066 | { |
d86d4aaf DE |
4067 | struct thread_info *thread = (struct thread_info *) entry; |
4068 | struct lwp_info *lwp = get_thread_lwp (thread); | |
02fc4de7 | 4069 | |
7984d532 PA |
4070 | /* Ignore EXCEPT. */ |
4071 | if (lwp == except) | |
4072 | return 0; | |
4073 | ||
02fc4de7 | 4074 | if (lwp->stopped) |
7984d532 | 4075 | return 0; |
02fc4de7 PA |
4076 | |
4077 | send_sigstop (lwp); | |
7984d532 PA |
4078 | return 0; |
4079 | } | |
4080 | ||
4081 | /* Increment the suspend count of an LWP, and stop it, if not stopped | |
4082 | yet. */ | |
4083 | static int | |
4084 | suspend_and_send_sigstop_callback (struct inferior_list_entry *entry, | |
4085 | void *except) | |
4086 | { | |
d86d4aaf DE |
4087 | struct thread_info *thread = (struct thread_info *) entry; |
4088 | struct lwp_info *lwp = get_thread_lwp (thread); | |
7984d532 PA |
4089 | |
4090 | /* Ignore EXCEPT. */ | |
4091 | if (lwp == except) | |
4092 | return 0; | |
4093 | ||
863d01bd | 4094 | lwp_suspended_inc (lwp); |
7984d532 PA |
4095 | |
4096 | return send_sigstop_callback (entry, except); | |
02fc4de7 PA |
4097 | } |
4098 | ||
95954743 PA |
4099 | static void |
4100 | mark_lwp_dead (struct lwp_info *lwp, int wstat) | |
4101 | { | |
95954743 PA |
4102 | /* Store the exit status for later. */ |
4103 | lwp->status_pending_p = 1; | |
4104 | lwp->status_pending = wstat; | |
4105 | ||
00db26fa PA |
4106 | /* Store in waitstatus as well, as there's nothing else to process |
4107 | for this event. */ | |
4108 | if (WIFEXITED (wstat)) | |
4109 | { | |
4110 | lwp->waitstatus.kind = TARGET_WAITKIND_EXITED; | |
4111 | lwp->waitstatus.value.integer = WEXITSTATUS (wstat); | |
4112 | } | |
4113 | else if (WIFSIGNALED (wstat)) | |
4114 | { | |
4115 | lwp->waitstatus.kind = TARGET_WAITKIND_SIGNALLED; | |
4116 | lwp->waitstatus.value.sig = gdb_signal_from_host (WTERMSIG (wstat)); | |
4117 | } | |
4118 | ||
95954743 PA |
4119 | /* Prevent trying to stop it. */ |
4120 | lwp->stopped = 1; | |
4121 | ||
4122 | /* No further stops are expected from a dead lwp. */ | |
4123 | lwp->stop_expected = 0; | |
4124 | } | |
4125 | ||
00db26fa PA |
4126 | /* Return true if LWP has exited already, and has a pending exit event |
4127 | to report to GDB. */ | |
4128 | ||
4129 | static int | |
4130 | lwp_is_marked_dead (struct lwp_info *lwp) | |
4131 | { | |
4132 | return (lwp->status_pending_p | |
4133 | && (WIFEXITED (lwp->status_pending) | |
4134 | || WIFSIGNALED (lwp->status_pending))); | |
4135 | } | |
4136 | ||
fa96cb38 PA |
4137 | /* Wait for all children to stop for the SIGSTOPs we just queued. */ |
4138 | ||
0d62e5e8 | 4139 | static void |
fa96cb38 | 4140 | wait_for_sigstop (void) |
0d62e5e8 | 4141 | { |
0bfdf32f | 4142 | struct thread_info *saved_thread; |
95954743 | 4143 | ptid_t saved_tid; |
fa96cb38 PA |
4144 | int wstat; |
4145 | int ret; | |
0d62e5e8 | 4146 | |
0bfdf32f GB |
4147 | saved_thread = current_thread; |
4148 | if (saved_thread != NULL) | |
4149 | saved_tid = saved_thread->entry.id; | |
bd99dc85 | 4150 | else |
95954743 | 4151 | saved_tid = null_ptid; /* avoid bogus unused warning */ |
bd99dc85 | 4152 | |
d50171e4 | 4153 | if (debug_threads) |
fa96cb38 | 4154 | debug_printf ("wait_for_sigstop: pulling events\n"); |
d50171e4 | 4155 | |
fa96cb38 PA |
4156 | /* Passing NULL_PTID as filter indicates we want all events to be |
4157 | left pending. Eventually this returns when there are no | |
4158 | unwaited-for children left. */ | |
4159 | ret = linux_wait_for_event_filtered (minus_one_ptid, null_ptid, | |
4160 | &wstat, __WALL); | |
4161 | gdb_assert (ret == -1); | |
0d62e5e8 | 4162 | |
0bfdf32f GB |
4163 | if (saved_thread == NULL || linux_thread_alive (saved_tid)) |
4164 | current_thread = saved_thread; | |
0d62e5e8 DJ |
4165 | else |
4166 | { | |
4167 | if (debug_threads) | |
87ce2a04 | 4168 | debug_printf ("Previously current thread died.\n"); |
0d62e5e8 | 4169 | |
f0db101d PA |
4170 | /* We can't change the current inferior behind GDB's back, |
4171 | otherwise, a subsequent command may apply to the wrong | |
4172 | process. */ | |
4173 | current_thread = NULL; | |
0d62e5e8 DJ |
4174 | } |
4175 | } | |
4176 | ||
fa593d66 PA |
4177 | /* Returns true if LWP ENTRY is stopped in a jump pad, and we can't |
4178 | move it out, because we need to report the stop event to GDB. For | |
4179 | example, if the user puts a breakpoint in the jump pad, it's | |
4180 | because she wants to debug it. */ | |
4181 | ||
4182 | static int | |
4183 | stuck_in_jump_pad_callback (struct inferior_list_entry *entry, void *data) | |
4184 | { | |
d86d4aaf DE |
4185 | struct thread_info *thread = (struct thread_info *) entry; |
4186 | struct lwp_info *lwp = get_thread_lwp (thread); | |
fa593d66 | 4187 | |
863d01bd PA |
4188 | if (lwp->suspended != 0) |
4189 | { | |
4190 | internal_error (__FILE__, __LINE__, | |
4191 | "LWP %ld is suspended, suspended=%d\n", | |
4192 | lwpid_of (thread), lwp->suspended); | |
4193 | } | |
fa593d66 PA |
4194 | gdb_assert (lwp->stopped); |
4195 | ||
4196 | /* Allow debugging the jump pad, gdb_collect, etc.. */ | |
4197 | return (supports_fast_tracepoints () | |
58b4daa5 | 4198 | && agent_loaded_p () |
fa593d66 | 4199 | && (gdb_breakpoint_here (lwp->stop_pc) |
15c66dd6 | 4200 | || lwp->stop_reason == TARGET_STOPPED_BY_WATCHPOINT |
fa593d66 | 4201 | || thread->last_resume_kind == resume_step) |
229d26fc SM |
4202 | && (linux_fast_tracepoint_collecting (lwp, NULL) |
4203 | != fast_tpoint_collect_result::not_collecting)); | |
fa593d66 PA |
4204 | } |
4205 | ||
4206 | static void | |
4207 | move_out_of_jump_pad_callback (struct inferior_list_entry *entry) | |
4208 | { | |
d86d4aaf | 4209 | struct thread_info *thread = (struct thread_info *) entry; |
f0ce0d3a | 4210 | struct thread_info *saved_thread; |
d86d4aaf | 4211 | struct lwp_info *lwp = get_thread_lwp (thread); |
fa593d66 PA |
4212 | int *wstat; |
4213 | ||
863d01bd PA |
4214 | if (lwp->suspended != 0) |
4215 | { | |
4216 | internal_error (__FILE__, __LINE__, | |
4217 | "LWP %ld is suspended, suspended=%d\n", | |
4218 | lwpid_of (thread), lwp->suspended); | |
4219 | } | |
fa593d66 PA |
4220 | gdb_assert (lwp->stopped); |
4221 | ||
f0ce0d3a PA |
4222 | /* For gdb_breakpoint_here. */ |
4223 | saved_thread = current_thread; | |
4224 | current_thread = thread; | |
4225 | ||
fa593d66 PA |
4226 | wstat = lwp->status_pending_p ? &lwp->status_pending : NULL; |
4227 | ||
4228 | /* Allow debugging the jump pad, gdb_collect, etc. */ | |
4229 | if (!gdb_breakpoint_here (lwp->stop_pc) | |
15c66dd6 | 4230 | && lwp->stop_reason != TARGET_STOPPED_BY_WATCHPOINT |
fa593d66 PA |
4231 | && thread->last_resume_kind != resume_step |
4232 | && maybe_move_out_of_jump_pad (lwp, wstat)) | |
4233 | { | |
4234 | if (debug_threads) | |
87ce2a04 | 4235 | debug_printf ("LWP %ld needs stabilizing (in jump pad)\n", |
d86d4aaf | 4236 | lwpid_of (thread)); |
fa593d66 PA |
4237 | |
4238 | if (wstat) | |
4239 | { | |
4240 | lwp->status_pending_p = 0; | |
4241 | enqueue_one_deferred_signal (lwp, wstat); | |
4242 | ||
4243 | if (debug_threads) | |
87ce2a04 DE |
4244 | debug_printf ("Signal %d for LWP %ld deferred " |
4245 | "(in jump pad)\n", | |
d86d4aaf | 4246 | WSTOPSIG (*wstat), lwpid_of (thread)); |
fa593d66 PA |
4247 | } |
4248 | ||
4249 | linux_resume_one_lwp (lwp, 0, 0, NULL); | |
4250 | } | |
4251 | else | |
863d01bd | 4252 | lwp_suspended_inc (lwp); |
f0ce0d3a PA |
4253 | |
4254 | current_thread = saved_thread; | |
fa593d66 PA |
4255 | } |
4256 | ||
4257 | static int | |
4258 | lwp_running (struct inferior_list_entry *entry, void *data) | |
4259 | { | |
d86d4aaf DE |
4260 | struct thread_info *thread = (struct thread_info *) entry; |
4261 | struct lwp_info *lwp = get_thread_lwp (thread); | |
fa593d66 | 4262 | |
00db26fa | 4263 | if (lwp_is_marked_dead (lwp)) |
fa593d66 PA |
4264 | return 0; |
4265 | if (lwp->stopped) | |
4266 | return 0; | |
4267 | return 1; | |
4268 | } | |
4269 | ||
7984d532 PA |
4270 | /* Stop all lwps that aren't stopped yet, except EXCEPT, if not NULL. |
4271 | If SUSPEND, then also increase the suspend count of every LWP, | |
4272 | except EXCEPT. */ | |
4273 | ||
0d62e5e8 | 4274 | static void |
7984d532 | 4275 | stop_all_lwps (int suspend, struct lwp_info *except) |
0d62e5e8 | 4276 | { |
bde24c0a PA |
4277 | /* Should not be called recursively. */ |
4278 | gdb_assert (stopping_threads == NOT_STOPPING_THREADS); | |
4279 | ||
87ce2a04 DE |
4280 | if (debug_threads) |
4281 | { | |
4282 | debug_enter (); | |
4283 | debug_printf ("stop_all_lwps (%s, except=%s)\n", | |
4284 | suspend ? "stop-and-suspend" : "stop", | |
4285 | except != NULL | |
d86d4aaf | 4286 | ? target_pid_to_str (ptid_of (get_lwp_thread (except))) |
87ce2a04 DE |
4287 | : "none"); |
4288 | } | |
4289 | ||
bde24c0a PA |
4290 | stopping_threads = (suspend |
4291 | ? STOPPING_AND_SUSPENDING_THREADS | |
4292 | : STOPPING_THREADS); | |
7984d532 PA |
4293 | |
4294 | if (suspend) | |
d86d4aaf | 4295 | find_inferior (&all_threads, suspend_and_send_sigstop_callback, except); |
7984d532 | 4296 | else |
d86d4aaf | 4297 | find_inferior (&all_threads, send_sigstop_callback, except); |
fa96cb38 | 4298 | wait_for_sigstop (); |
bde24c0a | 4299 | stopping_threads = NOT_STOPPING_THREADS; |
87ce2a04 DE |
4300 | |
4301 | if (debug_threads) | |
4302 | { | |
4303 | debug_printf ("stop_all_lwps done, setting stopping_threads " | |
4304 | "back to !stopping\n"); | |
4305 | debug_exit (); | |
4306 | } | |
0d62e5e8 DJ |
4307 | } |
4308 | ||
863d01bd PA |
4309 | /* Enqueue one signal in the chain of signals which need to be |
4310 | delivered to this process on next resume. */ | |
4311 | ||
4312 | static void | |
4313 | enqueue_pending_signal (struct lwp_info *lwp, int signal, siginfo_t *info) | |
4314 | { | |
8d749320 | 4315 | struct pending_signals *p_sig = XNEW (struct pending_signals); |
863d01bd | 4316 | |
863d01bd PA |
4317 | p_sig->prev = lwp->pending_signals; |
4318 | p_sig->signal = signal; | |
4319 | if (info == NULL) | |
4320 | memset (&p_sig->info, 0, sizeof (siginfo_t)); | |
4321 | else | |
4322 | memcpy (&p_sig->info, info, sizeof (siginfo_t)); | |
4323 | lwp->pending_signals = p_sig; | |
4324 | } | |
4325 | ||
fa5308bd AT |
4326 | /* Install breakpoints for software single stepping. */ |
4327 | ||
4328 | static void | |
4329 | install_software_single_step_breakpoints (struct lwp_info *lwp) | |
4330 | { | |
984a2c04 YQ |
4331 | struct thread_info *thread = get_lwp_thread (lwp); |
4332 | struct regcache *regcache = get_thread_regcache (thread, 1); | |
984a2c04 YQ |
4333 | struct cleanup *old_chain = make_cleanup_restore_current_thread (); |
4334 | ||
984a2c04 | 4335 | current_thread = thread; |
a0ff9e1a | 4336 | std::vector<CORE_ADDR> next_pcs = the_low_target.get_next_pcs (regcache); |
fa5308bd | 4337 | |
a0ff9e1a | 4338 | for (CORE_ADDR pc : next_pcs) |
3b9a79ef | 4339 | set_single_step_breakpoint (pc, current_ptid); |
fa5308bd AT |
4340 | |
4341 | do_cleanups (old_chain); | |
4342 | } | |
4343 | ||
7fe5e27e AT |
4344 | /* Single step via hardware or software single step. |
4345 | Return 1 if hardware single stepping, 0 if software single stepping | |
4346 | or can't single step. */ | |
4347 | ||
4348 | static int | |
4349 | single_step (struct lwp_info* lwp) | |
4350 | { | |
4351 | int step = 0; | |
4352 | ||
4353 | if (can_hardware_single_step ()) | |
4354 | { | |
4355 | step = 1; | |
4356 | } | |
4357 | else if (can_software_single_step ()) | |
4358 | { | |
4359 | install_software_single_step_breakpoints (lwp); | |
4360 | step = 0; | |
4361 | } | |
4362 | else | |
4363 | { | |
4364 | if (debug_threads) | |
4365 | debug_printf ("stepping is not implemented on this target"); | |
4366 | } | |
4367 | ||
4368 | return step; | |
4369 | } | |
4370 | ||
35ac8b3e | 4371 | /* The signal can be delivered to the inferior if we are not trying to |
5b061e98 YQ |
4372 | finish a fast tracepoint collect. Since signal can be delivered in |
4373 | the step-over, the program may go to signal handler and trap again | |
4374 | after return from the signal handler. We can live with the spurious | |
4375 | double traps. */ | |
35ac8b3e YQ |
4376 | |
4377 | static int | |
4378 | lwp_signal_can_be_delivered (struct lwp_info *lwp) | |
4379 | { | |
229d26fc SM |
4380 | return (lwp->collecting_fast_tracepoint |
4381 | == fast_tpoint_collect_result::not_collecting); | |
35ac8b3e YQ |
4382 | } |
4383 | ||
23f238d3 PA |
4384 | /* Resume execution of LWP. If STEP is nonzero, single-step it. If |
4385 | SIGNAL is nonzero, give it that signal. */ | |
da6d8c04 | 4386 | |
ce3a066d | 4387 | static void |
23f238d3 PA |
4388 | linux_resume_one_lwp_throw (struct lwp_info *lwp, |
4389 | int step, int signal, siginfo_t *info) | |
da6d8c04 | 4390 | { |
d86d4aaf | 4391 | struct thread_info *thread = get_lwp_thread (lwp); |
0bfdf32f | 4392 | struct thread_info *saved_thread; |
82075af2 | 4393 | int ptrace_request; |
c06cbd92 YQ |
4394 | struct process_info *proc = get_thread_process (thread); |
4395 | ||
4396 | /* Note that target description may not be initialised | |
4397 | (proc->tdesc == NULL) at this point because the program hasn't | |
4398 | stopped at the first instruction yet. It means GDBserver skips | |
4399 | the extra traps from the wrapper program (see option --wrapper). | |
4400 | Code in this function that requires register access should be | |
4401 | guarded by proc->tdesc == NULL or something else. */ | |
0d62e5e8 | 4402 | |
54a0b537 | 4403 | if (lwp->stopped == 0) |
0d62e5e8 DJ |
4404 | return; |
4405 | ||
65706a29 PA |
4406 | gdb_assert (lwp->waitstatus.kind == TARGET_WAITKIND_IGNORE); |
4407 | ||
229d26fc SM |
4408 | fast_tpoint_collect_result fast_tp_collecting |
4409 | = lwp->collecting_fast_tracepoint; | |
fa593d66 | 4410 | |
229d26fc SM |
4411 | gdb_assert (!stabilizing_threads |
4412 | || (fast_tp_collecting | |
4413 | != fast_tpoint_collect_result::not_collecting)); | |
fa593d66 | 4414 | |
219f2f23 PA |
4415 | /* Cancel actions that rely on GDB not changing the PC (e.g., the |
4416 | user used the "jump" command, or "set $pc = foo"). */ | |
c06cbd92 | 4417 | if (thread->while_stepping != NULL && lwp->stop_pc != get_pc (lwp)) |
219f2f23 PA |
4418 | { |
4419 | /* Collecting 'while-stepping' actions doesn't make sense | |
4420 | anymore. */ | |
d86d4aaf | 4421 | release_while_stepping_state_list (thread); |
219f2f23 PA |
4422 | } |
4423 | ||
0d62e5e8 | 4424 | /* If we have pending signals or status, and a new signal, enqueue the |
35ac8b3e YQ |
4425 | signal. Also enqueue the signal if it can't be delivered to the |
4426 | inferior right now. */ | |
0d62e5e8 | 4427 | if (signal != 0 |
fa593d66 PA |
4428 | && (lwp->status_pending_p |
4429 | || lwp->pending_signals != NULL | |
35ac8b3e | 4430 | || !lwp_signal_can_be_delivered (lwp))) |
94610ec4 YQ |
4431 | { |
4432 | enqueue_pending_signal (lwp, signal, info); | |
4433 | ||
4434 | /* Postpone any pending signal. It was enqueued above. */ | |
4435 | signal = 0; | |
4436 | } | |
0d62e5e8 | 4437 | |
d50171e4 PA |
4438 | if (lwp->status_pending_p) |
4439 | { | |
4440 | if (debug_threads) | |
94610ec4 | 4441 | debug_printf ("Not resuming lwp %ld (%s, stop %s);" |
87ce2a04 | 4442 | " has pending status\n", |
94610ec4 | 4443 | lwpid_of (thread), step ? "step" : "continue", |
87ce2a04 | 4444 | lwp->stop_expected ? "expected" : "not expected"); |
d50171e4 PA |
4445 | return; |
4446 | } | |
0d62e5e8 | 4447 | |
0bfdf32f GB |
4448 | saved_thread = current_thread; |
4449 | current_thread = thread; | |
0d62e5e8 | 4450 | |
0d62e5e8 DJ |
4451 | /* This bit needs some thinking about. If we get a signal that |
4452 | we must report while a single-step reinsert is still pending, | |
4453 | we often end up resuming the thread. It might be better to | |
4454 | (ew) allow a stack of pending events; then we could be sure that | |
4455 | the reinsert happened right away and not lose any signals. | |
4456 | ||
4457 | Making this stack would also shrink the window in which breakpoints are | |
54a0b537 | 4458 | uninserted (see comment in linux_wait_for_lwp) but not enough for |
0d62e5e8 DJ |
4459 | complete correctness, so it won't solve that problem. It may be |
4460 | worthwhile just to solve this one, however. */ | |
54a0b537 | 4461 | if (lwp->bp_reinsert != 0) |
0d62e5e8 DJ |
4462 | { |
4463 | if (debug_threads) | |
87ce2a04 DE |
4464 | debug_printf (" pending reinsert at 0x%s\n", |
4465 | paddress (lwp->bp_reinsert)); | |
d50171e4 | 4466 | |
85e00e85 | 4467 | if (can_hardware_single_step ()) |
d50171e4 | 4468 | { |
229d26fc | 4469 | if (fast_tp_collecting == fast_tpoint_collect_result::not_collecting) |
fa593d66 PA |
4470 | { |
4471 | if (step == 0) | |
9986ba08 | 4472 | warning ("BAD - reinserting but not stepping."); |
fa593d66 | 4473 | if (lwp->suspended) |
9986ba08 PA |
4474 | warning ("BAD - reinserting and suspended(%d).", |
4475 | lwp->suspended); | |
fa593d66 | 4476 | } |
d50171e4 | 4477 | } |
f79b145d YQ |
4478 | |
4479 | step = maybe_hw_step (thread); | |
0d62e5e8 DJ |
4480 | } |
4481 | ||
229d26fc | 4482 | if (fast_tp_collecting == fast_tpoint_collect_result::before_insn) |
fa593d66 PA |
4483 | { |
4484 | if (debug_threads) | |
87ce2a04 DE |
4485 | debug_printf ("lwp %ld wants to get out of fast tracepoint jump pad" |
4486 | " (exit-jump-pad-bkpt)\n", | |
d86d4aaf | 4487 | lwpid_of (thread)); |
fa593d66 | 4488 | } |
229d26fc | 4489 | else if (fast_tp_collecting == fast_tpoint_collect_result::at_insn) |
fa593d66 PA |
4490 | { |
4491 | if (debug_threads) | |
87ce2a04 DE |
4492 | debug_printf ("lwp %ld wants to get out of fast tracepoint jump pad" |
4493 | " single-stepping\n", | |
d86d4aaf | 4494 | lwpid_of (thread)); |
fa593d66 PA |
4495 | |
4496 | if (can_hardware_single_step ()) | |
4497 | step = 1; | |
4498 | else | |
38e08fca GB |
4499 | { |
4500 | internal_error (__FILE__, __LINE__, | |
4501 | "moving out of jump pad single-stepping" | |
4502 | " not implemented on this target"); | |
4503 | } | |
fa593d66 PA |
4504 | } |
4505 | ||
219f2f23 PA |
4506 | /* If we have while-stepping actions in this thread set it stepping. |
4507 | If we have a signal to deliver, it may or may not be set to | |
4508 | SIG_IGN, we don't know. Assume so, and allow collecting | |
4509 | while-stepping into a signal handler. A possible smart thing to | |
4510 | do would be to set an internal breakpoint at the signal return | |
4511 | address, continue, and carry on catching this while-stepping | |
4512 | action only when that breakpoint is hit. A future | |
4513 | enhancement. */ | |
7fe5e27e | 4514 | if (thread->while_stepping != NULL) |
219f2f23 PA |
4515 | { |
4516 | if (debug_threads) | |
87ce2a04 | 4517 | debug_printf ("lwp %ld has a while-stepping action -> forcing step.\n", |
d86d4aaf | 4518 | lwpid_of (thread)); |
7fe5e27e AT |
4519 | |
4520 | step = single_step (lwp); | |
219f2f23 PA |
4521 | } |
4522 | ||
c06cbd92 | 4523 | if (proc->tdesc != NULL && the_low_target.get_pc != NULL) |
0d62e5e8 | 4524 | { |
0bfdf32f | 4525 | struct regcache *regcache = get_thread_regcache (current_thread, 1); |
582511be PA |
4526 | |
4527 | lwp->stop_pc = (*the_low_target.get_pc) (regcache); | |
4528 | ||
4529 | if (debug_threads) | |
4530 | { | |
4531 | debug_printf (" %s from pc 0x%lx\n", step ? "step" : "continue", | |
4532 | (long) lwp->stop_pc); | |
4533 | } | |
0d62e5e8 DJ |
4534 | } |
4535 | ||
35ac8b3e YQ |
4536 | /* If we have pending signals, consume one if it can be delivered to |
4537 | the inferior. */ | |
4538 | if (lwp->pending_signals != NULL && lwp_signal_can_be_delivered (lwp)) | |
0d62e5e8 DJ |
4539 | { |
4540 | struct pending_signals **p_sig; | |
4541 | ||
54a0b537 | 4542 | p_sig = &lwp->pending_signals; |
0d62e5e8 DJ |
4543 | while ((*p_sig)->prev != NULL) |
4544 | p_sig = &(*p_sig)->prev; | |
4545 | ||
4546 | signal = (*p_sig)->signal; | |
32ca6d61 | 4547 | if ((*p_sig)->info.si_signo != 0) |
d86d4aaf | 4548 | ptrace (PTRACE_SETSIGINFO, lwpid_of (thread), (PTRACE_TYPE_ARG3) 0, |
56f7af9c | 4549 | &(*p_sig)->info); |
32ca6d61 | 4550 | |
0d62e5e8 DJ |
4551 | free (*p_sig); |
4552 | *p_sig = NULL; | |
4553 | } | |
4554 | ||
94610ec4 YQ |
4555 | if (debug_threads) |
4556 | debug_printf ("Resuming lwp %ld (%s, signal %d, stop %s)\n", | |
4557 | lwpid_of (thread), step ? "step" : "continue", signal, | |
4558 | lwp->stop_expected ? "expected" : "not expected"); | |
4559 | ||
aa5ca48f DE |
4560 | if (the_low_target.prepare_to_resume != NULL) |
4561 | the_low_target.prepare_to_resume (lwp); | |
4562 | ||
d86d4aaf | 4563 | regcache_invalidate_thread (thread); |
da6d8c04 | 4564 | errno = 0; |
54a0b537 | 4565 | lwp->stepping = step; |
82075af2 JS |
4566 | if (step) |
4567 | ptrace_request = PTRACE_SINGLESTEP; | |
4568 | else if (gdb_catching_syscalls_p (lwp)) | |
4569 | ptrace_request = PTRACE_SYSCALL; | |
4570 | else | |
4571 | ptrace_request = PTRACE_CONT; | |
4572 | ptrace (ptrace_request, | |
4573 | lwpid_of (thread), | |
b8e1b30e | 4574 | (PTRACE_TYPE_ARG3) 0, |
14ce3065 DE |
4575 | /* Coerce to a uintptr_t first to avoid potential gcc warning |
4576 | of coercing an 8 byte integer to a 4 byte pointer. */ | |
b8e1b30e | 4577 | (PTRACE_TYPE_ARG4) (uintptr_t) signal); |
0d62e5e8 | 4578 | |
0bfdf32f | 4579 | current_thread = saved_thread; |
da6d8c04 | 4580 | if (errno) |
23f238d3 PA |
4581 | perror_with_name ("resuming thread"); |
4582 | ||
4583 | /* Successfully resumed. Clear state that no longer makes sense, | |
4584 | and mark the LWP as running. Must not do this before resuming | |
4585 | otherwise if that fails other code will be confused. E.g., we'd | |
4586 | later try to stop the LWP and hang forever waiting for a stop | |
4587 | status. Note that we must not throw after this is cleared, | |
4588 | otherwise handle_zombie_lwp_error would get confused. */ | |
4589 | lwp->stopped = 0; | |
4590 | lwp->stop_reason = TARGET_STOPPED_BY_NO_REASON; | |
4591 | } | |
4592 | ||
4593 | /* Called when we try to resume a stopped LWP and that errors out. If | |
4594 | the LWP is no longer in ptrace-stopped state (meaning it's zombie, | |
4595 | or about to become), discard the error, clear any pending status | |
4596 | the LWP may have, and return true (we'll collect the exit status | |
4597 | soon enough). Otherwise, return false. */ | |
4598 | ||
4599 | static int | |
4600 | check_ptrace_stopped_lwp_gone (struct lwp_info *lp) | |
4601 | { | |
4602 | struct thread_info *thread = get_lwp_thread (lp); | |
4603 | ||
4604 | /* If we get an error after resuming the LWP successfully, we'd | |
4605 | confuse !T state for the LWP being gone. */ | |
4606 | gdb_assert (lp->stopped); | |
4607 | ||
4608 | /* We can't just check whether the LWP is in 'Z (Zombie)' state, | |
4609 | because even if ptrace failed with ESRCH, the tracee may be "not | |
4610 | yet fully dead", but already refusing ptrace requests. In that | |
4611 | case the tracee has 'R (Running)' state for a little bit | |
4612 | (observed in Linux 3.18). See also the note on ESRCH in the | |
4613 | ptrace(2) man page. Instead, check whether the LWP has any state | |
4614 | other than ptrace-stopped. */ | |
4615 | ||
4616 | /* Don't assume anything if /proc/PID/status can't be read. */ | |
4617 | if (linux_proc_pid_is_trace_stopped_nowarn (lwpid_of (thread)) == 0) | |
3221518c | 4618 | { |
23f238d3 PA |
4619 | lp->stop_reason = TARGET_STOPPED_BY_NO_REASON; |
4620 | lp->status_pending_p = 0; | |
4621 | return 1; | |
4622 | } | |
4623 | return 0; | |
4624 | } | |
4625 | ||
4626 | /* Like linux_resume_one_lwp_throw, but no error is thrown if the LWP | |
4627 | disappears while we try to resume it. */ | |
3221518c | 4628 | |
23f238d3 PA |
4629 | static void |
4630 | linux_resume_one_lwp (struct lwp_info *lwp, | |
4631 | int step, int signal, siginfo_t *info) | |
4632 | { | |
4633 | TRY | |
4634 | { | |
4635 | linux_resume_one_lwp_throw (lwp, step, signal, info); | |
4636 | } | |
4637 | CATCH (ex, RETURN_MASK_ERROR) | |
4638 | { | |
4639 | if (!check_ptrace_stopped_lwp_gone (lwp)) | |
4640 | throw_exception (ex); | |
3221518c | 4641 | } |
23f238d3 | 4642 | END_CATCH |
da6d8c04 DJ |
4643 | } |
4644 | ||
2bd7c093 PA |
4645 | struct thread_resume_array |
4646 | { | |
4647 | struct thread_resume *resume; | |
4648 | size_t n; | |
4649 | }; | |
64386c31 | 4650 | |
ebcf782c DE |
4651 | /* This function is called once per thread via find_inferior. |
4652 | ARG is a pointer to a thread_resume_array struct. | |
4653 | We look up the thread specified by ENTRY in ARG, and mark the thread | |
4654 | with a pointer to the appropriate resume request. | |
5544ad89 DJ |
4655 | |
4656 | This algorithm is O(threads * resume elements), but resume elements | |
4657 | is small (and will remain small at least until GDB supports thread | |
4658 | suspension). */ | |
ebcf782c | 4659 | |
2bd7c093 PA |
4660 | static int |
4661 | linux_set_resume_request (struct inferior_list_entry *entry, void *arg) | |
0d62e5e8 | 4662 | { |
d86d4aaf DE |
4663 | struct thread_info *thread = (struct thread_info *) entry; |
4664 | struct lwp_info *lwp = get_thread_lwp (thread); | |
5544ad89 | 4665 | int ndx; |
2bd7c093 | 4666 | struct thread_resume_array *r; |
64386c31 | 4667 | |
9a3c8263 | 4668 | r = (struct thread_resume_array *) arg; |
64386c31 | 4669 | |
2bd7c093 | 4670 | for (ndx = 0; ndx < r->n; ndx++) |
95954743 PA |
4671 | { |
4672 | ptid_t ptid = r->resume[ndx].thread; | |
4673 | if (ptid_equal (ptid, minus_one_ptid) | |
4674 | || ptid_equal (ptid, entry->id) | |
0c9070b3 YQ |
4675 | /* Handle both 'pPID' and 'pPID.-1' as meaning 'all threads |
4676 | of PID'. */ | |
d86d4aaf | 4677 | || (ptid_get_pid (ptid) == pid_of (thread) |
0c9070b3 YQ |
4678 | && (ptid_is_pid (ptid) |
4679 | || ptid_get_lwp (ptid) == -1))) | |
95954743 | 4680 | { |
d50171e4 | 4681 | if (r->resume[ndx].kind == resume_stop |
8336d594 | 4682 | && thread->last_resume_kind == resume_stop) |
d50171e4 PA |
4683 | { |
4684 | if (debug_threads) | |
87ce2a04 DE |
4685 | debug_printf ("already %s LWP %ld at GDB's request\n", |
4686 | (thread->last_status.kind | |
4687 | == TARGET_WAITKIND_STOPPED) | |
4688 | ? "stopped" | |
4689 | : "stopping", | |
d86d4aaf | 4690 | lwpid_of (thread)); |
d50171e4 PA |
4691 | |
4692 | continue; | |
4693 | } | |
4694 | ||
5a04c4cf PA |
4695 | /* Ignore (wildcard) resume requests for already-resumed |
4696 | threads. */ | |
4697 | if (r->resume[ndx].kind != resume_stop | |
4698 | && thread->last_resume_kind != resume_stop) | |
4699 | { | |
4700 | if (debug_threads) | |
4701 | debug_printf ("already %s LWP %ld at GDB's request\n", | |
4702 | (thread->last_resume_kind | |
4703 | == resume_step) | |
4704 | ? "stepping" | |
4705 | : "continuing", | |
4706 | lwpid_of (thread)); | |
4707 | continue; | |
4708 | } | |
4709 | ||
4710 | /* Don't let wildcard resumes resume fork children that GDB | |
4711 | does not yet know are new fork children. */ | |
4712 | if (lwp->fork_relative != NULL) | |
4713 | { | |
4714 | struct inferior_list_entry *inf, *tmp; | |
4715 | struct lwp_info *rel = lwp->fork_relative; | |
4716 | ||
4717 | if (rel->status_pending_p | |
4718 | && (rel->waitstatus.kind == TARGET_WAITKIND_FORKED | |
4719 | || rel->waitstatus.kind == TARGET_WAITKIND_VFORKED)) | |
4720 | { | |
4721 | if (debug_threads) | |
4722 | debug_printf ("not resuming LWP %ld: has queued stop reply\n", | |
4723 | lwpid_of (thread)); | |
4724 | continue; | |
4725 | } | |
4726 | } | |
4727 | ||
4728 | /* If the thread has a pending event that has already been | |
4729 | reported to GDBserver core, but GDB has not pulled the | |
4730 | event out of the vStopped queue yet, likewise, ignore the | |
4731 | (wildcard) resume request. */ | |
4732 | if (in_queued_stop_replies (entry->id)) | |
4733 | { | |
4734 | if (debug_threads) | |
4735 | debug_printf ("not resuming LWP %ld: has queued stop reply\n", | |
4736 | lwpid_of (thread)); | |
4737 | continue; | |
4738 | } | |
4739 | ||
95954743 | 4740 | lwp->resume = &r->resume[ndx]; |
8336d594 | 4741 | thread->last_resume_kind = lwp->resume->kind; |
fa593d66 | 4742 | |
c2d6af84 PA |
4743 | lwp->step_range_start = lwp->resume->step_range_start; |
4744 | lwp->step_range_end = lwp->resume->step_range_end; | |
4745 | ||
fa593d66 PA |
4746 | /* If we had a deferred signal to report, dequeue one now. |
4747 | This can happen if LWP gets more than one signal while | |
4748 | trying to get out of a jump pad. */ | |
4749 | if (lwp->stopped | |
4750 | && !lwp->status_pending_p | |
4751 | && dequeue_one_deferred_signal (lwp, &lwp->status_pending)) | |
4752 | { | |
4753 | lwp->status_pending_p = 1; | |
4754 | ||
4755 | if (debug_threads) | |
87ce2a04 DE |
4756 | debug_printf ("Dequeueing deferred signal %d for LWP %ld, " |
4757 | "leaving status pending.\n", | |
d86d4aaf DE |
4758 | WSTOPSIG (lwp->status_pending), |
4759 | lwpid_of (thread)); | |
fa593d66 PA |
4760 | } |
4761 | ||
95954743 PA |
4762 | return 0; |
4763 | } | |
4764 | } | |
2bd7c093 PA |
4765 | |
4766 | /* No resume action for this thread. */ | |
4767 | lwp->resume = NULL; | |
64386c31 | 4768 | |
2bd7c093 | 4769 | return 0; |
5544ad89 DJ |
4770 | } |
4771 | ||
20ad9378 DE |
4772 | /* find_inferior callback for linux_resume. |
4773 | Set *FLAG_P if this lwp has an interesting status pending. */ | |
5544ad89 | 4774 | |
bd99dc85 PA |
4775 | static int |
4776 | resume_status_pending_p (struct inferior_list_entry *entry, void *flag_p) | |
5544ad89 | 4777 | { |
d86d4aaf DE |
4778 | struct thread_info *thread = (struct thread_info *) entry; |
4779 | struct lwp_info *lwp = get_thread_lwp (thread); | |
5544ad89 | 4780 | |
bd99dc85 PA |
4781 | /* LWPs which will not be resumed are not interesting, because |
4782 | we might not wait for them next time through linux_wait. */ | |
2bd7c093 | 4783 | if (lwp->resume == NULL) |
bd99dc85 | 4784 | return 0; |
64386c31 | 4785 | |
582511be | 4786 | if (thread_still_has_status_pending_p (thread)) |
d50171e4 PA |
4787 | * (int *) flag_p = 1; |
4788 | ||
4789 | return 0; | |
4790 | } | |
4791 | ||
4792 | /* Return 1 if this lwp that GDB wants running is stopped at an | |
4793 | internal breakpoint that we need to step over. It assumes that any | |
4794 | required STOP_PC adjustment has already been propagated to the | |
4795 | inferior's regcache. */ | |
4796 | ||
4797 | static int | |
4798 | need_step_over_p (struct inferior_list_entry *entry, void *dummy) | |
4799 | { | |
d86d4aaf DE |
4800 | struct thread_info *thread = (struct thread_info *) entry; |
4801 | struct lwp_info *lwp = get_thread_lwp (thread); | |
0bfdf32f | 4802 | struct thread_info *saved_thread; |
d50171e4 | 4803 | CORE_ADDR pc; |
c06cbd92 YQ |
4804 | struct process_info *proc = get_thread_process (thread); |
4805 | ||
4806 | /* GDBserver is skipping the extra traps from the wrapper program, | |
4807 | don't have to do step over. */ | |
4808 | if (proc->tdesc == NULL) | |
4809 | return 0; | |
d50171e4 PA |
4810 | |
4811 | /* LWPs which will not be resumed are not interesting, because we | |
4812 | might not wait for them next time through linux_wait. */ | |
4813 | ||
4814 | if (!lwp->stopped) | |
4815 | { | |
4816 | if (debug_threads) | |
87ce2a04 | 4817 | debug_printf ("Need step over [LWP %ld]? Ignoring, not stopped\n", |
d86d4aaf | 4818 | lwpid_of (thread)); |
d50171e4 PA |
4819 | return 0; |
4820 | } | |
4821 | ||
8336d594 | 4822 | if (thread->last_resume_kind == resume_stop) |
d50171e4 PA |
4823 | { |
4824 | if (debug_threads) | |
87ce2a04 DE |
4825 | debug_printf ("Need step over [LWP %ld]? Ignoring, should remain" |
4826 | " stopped\n", | |
d86d4aaf | 4827 | lwpid_of (thread)); |
d50171e4 PA |
4828 | return 0; |
4829 | } | |
4830 | ||
7984d532 PA |
4831 | gdb_assert (lwp->suspended >= 0); |
4832 | ||
4833 | if (lwp->suspended) | |
4834 | { | |
4835 | if (debug_threads) | |
87ce2a04 | 4836 | debug_printf ("Need step over [LWP %ld]? Ignoring, suspended\n", |
d86d4aaf | 4837 | lwpid_of (thread)); |
7984d532 PA |
4838 | return 0; |
4839 | } | |
4840 | ||
bd99dc85 | 4841 | if (lwp->status_pending_p) |
d50171e4 PA |
4842 | { |
4843 | if (debug_threads) | |
87ce2a04 DE |
4844 | debug_printf ("Need step over [LWP %ld]? Ignoring, has pending" |
4845 | " status.\n", | |
d86d4aaf | 4846 | lwpid_of (thread)); |
d50171e4 PA |
4847 | return 0; |
4848 | } | |
4849 | ||
4850 | /* Note: PC, not STOP_PC. Either GDB has adjusted the PC already, | |
4851 | or we have. */ | |
4852 | pc = get_pc (lwp); | |
4853 | ||
4854 | /* If the PC has changed since we stopped, then don't do anything, | |
4855 | and let the breakpoint/tracepoint be hit. This happens if, for | |
4856 | instance, GDB handled the decr_pc_after_break subtraction itself, | |
4857 | GDB is OOL stepping this thread, or the user has issued a "jump" | |
4858 | command, or poked thread's registers herself. */ | |
4859 | if (pc != lwp->stop_pc) | |
4860 | { | |
4861 | if (debug_threads) | |
87ce2a04 DE |
4862 | debug_printf ("Need step over [LWP %ld]? Cancelling, PC was changed. " |
4863 | "Old stop_pc was 0x%s, PC is now 0x%s\n", | |
d86d4aaf DE |
4864 | lwpid_of (thread), |
4865 | paddress (lwp->stop_pc), paddress (pc)); | |
d50171e4 PA |
4866 | return 0; |
4867 | } | |
4868 | ||
484b3c32 YQ |
4869 | /* On software single step target, resume the inferior with signal |
4870 | rather than stepping over. */ | |
4871 | if (can_software_single_step () | |
4872 | && lwp->pending_signals != NULL | |
4873 | && lwp_signal_can_be_delivered (lwp)) | |
4874 | { | |
4875 | if (debug_threads) | |
4876 | debug_printf ("Need step over [LWP %ld]? Ignoring, has pending" | |
4877 | " signals.\n", | |
4878 | lwpid_of (thread)); | |
4879 | ||
4880 | return 0; | |
4881 | } | |
4882 | ||
0bfdf32f GB |
4883 | saved_thread = current_thread; |
4884 | current_thread = thread; | |
d50171e4 | 4885 | |
8b07ae33 | 4886 | /* We can only step over breakpoints we know about. */ |
fa593d66 | 4887 | if (breakpoint_here (pc) || fast_tracepoint_jump_here (pc)) |
d50171e4 | 4888 | { |
8b07ae33 | 4889 | /* Don't step over a breakpoint that GDB expects to hit |
9f3a5c85 LM |
4890 | though. If the condition is being evaluated on the target's side |
4891 | and it evaluate to false, step over this breakpoint as well. */ | |
4892 | if (gdb_breakpoint_here (pc) | |
d3ce09f5 SS |
4893 | && gdb_condition_true_at_breakpoint (pc) |
4894 | && gdb_no_commands_at_breakpoint (pc)) | |
8b07ae33 PA |
4895 | { |
4896 | if (debug_threads) | |
87ce2a04 DE |
4897 | debug_printf ("Need step over [LWP %ld]? yes, but found" |
4898 | " GDB breakpoint at 0x%s; skipping step over\n", | |
d86d4aaf | 4899 | lwpid_of (thread), paddress (pc)); |
d50171e4 | 4900 | |
0bfdf32f | 4901 | current_thread = saved_thread; |
8b07ae33 PA |
4902 | return 0; |
4903 | } | |
4904 | else | |
4905 | { | |
4906 | if (debug_threads) | |
87ce2a04 DE |
4907 | debug_printf ("Need step over [LWP %ld]? yes, " |
4908 | "found breakpoint at 0x%s\n", | |
d86d4aaf | 4909 | lwpid_of (thread), paddress (pc)); |
d50171e4 | 4910 | |
8b07ae33 PA |
4911 | /* We've found an lwp that needs stepping over --- return 1 so |
4912 | that find_inferior stops looking. */ | |
0bfdf32f | 4913 | current_thread = saved_thread; |
8b07ae33 | 4914 | |
8b07ae33 PA |
4915 | return 1; |
4916 | } | |
d50171e4 PA |
4917 | } |
4918 | ||
0bfdf32f | 4919 | current_thread = saved_thread; |
d50171e4 PA |
4920 | |
4921 | if (debug_threads) | |
87ce2a04 DE |
4922 | debug_printf ("Need step over [LWP %ld]? No, no breakpoint found" |
4923 | " at 0x%s\n", | |
d86d4aaf | 4924 | lwpid_of (thread), paddress (pc)); |
c6ecbae5 | 4925 | |
bd99dc85 | 4926 | return 0; |
5544ad89 DJ |
4927 | } |
4928 | ||
d50171e4 PA |
4929 | /* Start a step-over operation on LWP. When LWP stopped at a |
4930 | breakpoint, to make progress, we need to remove the breakpoint out | |
4931 | of the way. If we let other threads run while we do that, they may | |
4932 | pass by the breakpoint location and miss hitting it. To avoid | |
4933 | that, a step-over momentarily stops all threads while LWP is | |
c40c8d4b YQ |
4934 | single-stepped by either hardware or software while the breakpoint |
4935 | is temporarily uninserted from the inferior. When the single-step | |
4936 | finishes, we reinsert the breakpoint, and let all threads that are | |
4937 | supposed to be running, run again. */ | |
d50171e4 PA |
4938 | |
4939 | static int | |
4940 | start_step_over (struct lwp_info *lwp) | |
4941 | { | |
d86d4aaf | 4942 | struct thread_info *thread = get_lwp_thread (lwp); |
0bfdf32f | 4943 | struct thread_info *saved_thread; |
d50171e4 PA |
4944 | CORE_ADDR pc; |
4945 | int step; | |
4946 | ||
4947 | if (debug_threads) | |
87ce2a04 | 4948 | debug_printf ("Starting step-over on LWP %ld. Stopping all threads\n", |
d86d4aaf | 4949 | lwpid_of (thread)); |
d50171e4 | 4950 | |
7984d532 | 4951 | stop_all_lwps (1, lwp); |
863d01bd PA |
4952 | |
4953 | if (lwp->suspended != 0) | |
4954 | { | |
4955 | internal_error (__FILE__, __LINE__, | |
4956 | "LWP %ld suspended=%d\n", lwpid_of (thread), | |
4957 | lwp->suspended); | |
4958 | } | |
d50171e4 PA |
4959 | |
4960 | if (debug_threads) | |
87ce2a04 | 4961 | debug_printf ("Done stopping all threads for step-over.\n"); |
d50171e4 PA |
4962 | |
4963 | /* Note, we should always reach here with an already adjusted PC, | |
4964 | either by GDB (if we're resuming due to GDB's request), or by our | |
4965 | caller, if we just finished handling an internal breakpoint GDB | |
4966 | shouldn't care about. */ | |
4967 | pc = get_pc (lwp); | |
4968 | ||
0bfdf32f GB |
4969 | saved_thread = current_thread; |
4970 | current_thread = thread; | |
d50171e4 PA |
4971 | |
4972 | lwp->bp_reinsert = pc; | |
4973 | uninsert_breakpoints_at (pc); | |
fa593d66 | 4974 | uninsert_fast_tracepoint_jumps_at (pc); |
d50171e4 | 4975 | |
7fe5e27e | 4976 | step = single_step (lwp); |
d50171e4 | 4977 | |
0bfdf32f | 4978 | current_thread = saved_thread; |
d50171e4 PA |
4979 | |
4980 | linux_resume_one_lwp (lwp, step, 0, NULL); | |
4981 | ||
4982 | /* Require next event from this LWP. */ | |
d86d4aaf | 4983 | step_over_bkpt = thread->entry.id; |
d50171e4 PA |
4984 | return 1; |
4985 | } | |
4986 | ||
4987 | /* Finish a step-over. Reinsert the breakpoint we had uninserted in | |
3b9a79ef | 4988 | start_step_over, if still there, and delete any single-step |
d50171e4 PA |
4989 | breakpoints we've set, on non hardware single-step targets. */ |
4990 | ||
4991 | static int | |
4992 | finish_step_over (struct lwp_info *lwp) | |
4993 | { | |
4994 | if (lwp->bp_reinsert != 0) | |
4995 | { | |
f79b145d YQ |
4996 | struct thread_info *saved_thread = current_thread; |
4997 | ||
d50171e4 | 4998 | if (debug_threads) |
87ce2a04 | 4999 | debug_printf ("Finished step over.\n"); |
d50171e4 | 5000 | |
f79b145d YQ |
5001 | current_thread = get_lwp_thread (lwp); |
5002 | ||
d50171e4 PA |
5003 | /* Reinsert any breakpoint at LWP->BP_REINSERT. Note that there |
5004 | may be no breakpoint to reinsert there by now. */ | |
5005 | reinsert_breakpoints_at (lwp->bp_reinsert); | |
fa593d66 | 5006 | reinsert_fast_tracepoint_jumps_at (lwp->bp_reinsert); |
d50171e4 PA |
5007 | |
5008 | lwp->bp_reinsert = 0; | |
5009 | ||
3b9a79ef YQ |
5010 | /* Delete any single-step breakpoints. No longer needed. We |
5011 | don't have to worry about other threads hitting this trap, | |
5012 | and later not being able to explain it, because we were | |
5013 | stepping over a breakpoint, and we hold all threads but | |
5014 | LWP stopped while doing that. */ | |
d50171e4 | 5015 | if (!can_hardware_single_step ()) |
f79b145d | 5016 | { |
3b9a79ef YQ |
5017 | gdb_assert (has_single_step_breakpoints (current_thread)); |
5018 | delete_single_step_breakpoints (current_thread); | |
f79b145d | 5019 | } |
d50171e4 PA |
5020 | |
5021 | step_over_bkpt = null_ptid; | |
f79b145d | 5022 | current_thread = saved_thread; |
d50171e4 PA |
5023 | return 1; |
5024 | } | |
5025 | else | |
5026 | return 0; | |
5027 | } | |
5028 | ||
863d01bd PA |
5029 | /* If there's a step over in progress, wait until all threads stop |
5030 | (that is, until the stepping thread finishes its step), and | |
5031 | unsuspend all lwps. The stepping thread ends with its status | |
5032 | pending, which is processed later when we get back to processing | |
5033 | events. */ | |
5034 | ||
5035 | static void | |
5036 | complete_ongoing_step_over (void) | |
5037 | { | |
5038 | if (!ptid_equal (step_over_bkpt, null_ptid)) | |
5039 | { | |
5040 | struct lwp_info *lwp; | |
5041 | int wstat; | |
5042 | int ret; | |
5043 | ||
5044 | if (debug_threads) | |
5045 | debug_printf ("detach: step over in progress, finish it first\n"); | |
5046 | ||
5047 | /* Passing NULL_PTID as filter indicates we want all events to | |
5048 | be left pending. Eventually this returns when there are no | |
5049 | unwaited-for children left. */ | |
5050 | ret = linux_wait_for_event_filtered (minus_one_ptid, null_ptid, | |
5051 | &wstat, __WALL); | |
5052 | gdb_assert (ret == -1); | |
5053 | ||
5054 | lwp = find_lwp_pid (step_over_bkpt); | |
5055 | if (lwp != NULL) | |
5056 | finish_step_over (lwp); | |
5057 | step_over_bkpt = null_ptid; | |
5058 | unsuspend_all_lwps (lwp); | |
5059 | } | |
5060 | } | |
5061 | ||
5544ad89 DJ |
5062 | /* This function is called once per thread. We check the thread's resume |
5063 | request, which will tell us whether to resume, step, or leave the thread | |
bd99dc85 | 5064 | stopped; and what signal, if any, it should be sent. |
5544ad89 | 5065 | |
bd99dc85 PA |
5066 | For threads which we aren't explicitly told otherwise, we preserve |
5067 | the stepping flag; this is used for stepping over gdbserver-placed | |
5068 | breakpoints. | |
5069 | ||
5070 | If pending_flags was set in any thread, we queue any needed | |
5071 | signals, since we won't actually resume. We already have a pending | |
5072 | event to report, so we don't need to preserve any step requests; | |
5073 | they should be re-issued if necessary. */ | |
5074 | ||
5075 | static int | |
5076 | linux_resume_one_thread (struct inferior_list_entry *entry, void *arg) | |
5544ad89 | 5077 | { |
d86d4aaf DE |
5078 | struct thread_info *thread = (struct thread_info *) entry; |
5079 | struct lwp_info *lwp = get_thread_lwp (thread); | |
d50171e4 PA |
5080 | int leave_all_stopped = * (int *) arg; |
5081 | int leave_pending; | |
5544ad89 | 5082 | |
2bd7c093 | 5083 | if (lwp->resume == NULL) |
bd99dc85 | 5084 | return 0; |
5544ad89 | 5085 | |
bd99dc85 | 5086 | if (lwp->resume->kind == resume_stop) |
5544ad89 | 5087 | { |
bd99dc85 | 5088 | if (debug_threads) |
d86d4aaf | 5089 | debug_printf ("resume_stop request for LWP %ld\n", lwpid_of (thread)); |
bd99dc85 PA |
5090 | |
5091 | if (!lwp->stopped) | |
5092 | { | |
5093 | if (debug_threads) | |
d86d4aaf | 5094 | debug_printf ("stopping LWP %ld\n", lwpid_of (thread)); |
bd99dc85 | 5095 | |
d50171e4 PA |
5096 | /* Stop the thread, and wait for the event asynchronously, |
5097 | through the event loop. */ | |
02fc4de7 | 5098 | send_sigstop (lwp); |
bd99dc85 PA |
5099 | } |
5100 | else | |
5101 | { | |
5102 | if (debug_threads) | |
87ce2a04 | 5103 | debug_printf ("already stopped LWP %ld\n", |
d86d4aaf | 5104 | lwpid_of (thread)); |
d50171e4 PA |
5105 | |
5106 | /* The LWP may have been stopped in an internal event that | |
5107 | was not meant to be notified back to GDB (e.g., gdbserver | |
5108 | breakpoint), so we should be reporting a stop event in | |
5109 | this case too. */ | |
5110 | ||
5111 | /* If the thread already has a pending SIGSTOP, this is a | |
5112 | no-op. Otherwise, something later will presumably resume | |
5113 | the thread and this will cause it to cancel any pending | |
5114 | operation, due to last_resume_kind == resume_stop. If | |
5115 | the thread already has a pending status to report, we | |
5116 | will still report it the next time we wait - see | |
5117 | status_pending_p_callback. */ | |
1a981360 PA |
5118 | |
5119 | /* If we already have a pending signal to report, then | |
5120 | there's no need to queue a SIGSTOP, as this means we're | |
5121 | midway through moving the LWP out of the jumppad, and we | |
5122 | will report the pending signal as soon as that is | |
5123 | finished. */ | |
5124 | if (lwp->pending_signals_to_report == NULL) | |
5125 | send_sigstop (lwp); | |
bd99dc85 | 5126 | } |
32ca6d61 | 5127 | |
bd99dc85 PA |
5128 | /* For stop requests, we're done. */ |
5129 | lwp->resume = NULL; | |
fc7238bb | 5130 | thread->last_status.kind = TARGET_WAITKIND_IGNORE; |
bd99dc85 | 5131 | return 0; |
5544ad89 DJ |
5132 | } |
5133 | ||
bd99dc85 | 5134 | /* If this thread which is about to be resumed has a pending status, |
863d01bd PA |
5135 | then don't resume it - we can just report the pending status. |
5136 | Likewise if it is suspended, because e.g., another thread is | |
5137 | stepping past a breakpoint. Make sure to queue any signals that | |
5138 | would otherwise be sent. In all-stop mode, we do this decision | |
5139 | based on if *any* thread has a pending status. If there's a | |
5140 | thread that needs the step-over-breakpoint dance, then don't | |
5141 | resume any other thread but that particular one. */ | |
5142 | leave_pending = (lwp->suspended | |
5143 | || lwp->status_pending_p | |
5144 | || leave_all_stopped); | |
5544ad89 | 5145 | |
0e9a339e YQ |
5146 | /* If we have a new signal, enqueue the signal. */ |
5147 | if (lwp->resume->sig != 0) | |
5148 | { | |
5149 | siginfo_t info, *info_p; | |
5150 | ||
5151 | /* If this is the same signal we were previously stopped by, | |
5152 | make sure to queue its siginfo. */ | |
5153 | if (WIFSTOPPED (lwp->last_status) | |
5154 | && WSTOPSIG (lwp->last_status) == lwp->resume->sig | |
5155 | && ptrace (PTRACE_GETSIGINFO, lwpid_of (thread), | |
5156 | (PTRACE_TYPE_ARG3) 0, &info) == 0) | |
5157 | info_p = &info; | |
5158 | else | |
5159 | info_p = NULL; | |
5160 | ||
5161 | enqueue_pending_signal (lwp, lwp->resume->sig, info_p); | |
5162 | } | |
5163 | ||
d50171e4 | 5164 | if (!leave_pending) |
bd99dc85 PA |
5165 | { |
5166 | if (debug_threads) | |
d86d4aaf | 5167 | debug_printf ("resuming LWP %ld\n", lwpid_of (thread)); |
5544ad89 | 5168 | |
0e9a339e | 5169 | proceed_one_lwp (entry, NULL); |
bd99dc85 PA |
5170 | } |
5171 | else | |
5172 | { | |
5173 | if (debug_threads) | |
d86d4aaf | 5174 | debug_printf ("leaving LWP %ld stopped\n", lwpid_of (thread)); |
bd99dc85 | 5175 | } |
5544ad89 | 5176 | |
fc7238bb | 5177 | thread->last_status.kind = TARGET_WAITKIND_IGNORE; |
bd99dc85 | 5178 | lwp->resume = NULL; |
5544ad89 | 5179 | return 0; |
0d62e5e8 DJ |
5180 | } |
5181 | ||
5182 | static void | |
2bd7c093 | 5183 | linux_resume (struct thread_resume *resume_info, size_t n) |
0d62e5e8 | 5184 | { |
2bd7c093 | 5185 | struct thread_resume_array array = { resume_info, n }; |
d86d4aaf | 5186 | struct thread_info *need_step_over = NULL; |
d50171e4 PA |
5187 | int any_pending; |
5188 | int leave_all_stopped; | |
c6ecbae5 | 5189 | |
87ce2a04 DE |
5190 | if (debug_threads) |
5191 | { | |
5192 | debug_enter (); | |
5193 | debug_printf ("linux_resume:\n"); | |
5194 | } | |
5195 | ||
2bd7c093 | 5196 | find_inferior (&all_threads, linux_set_resume_request, &array); |
5544ad89 | 5197 | |
d50171e4 PA |
5198 | /* If there is a thread which would otherwise be resumed, which has |
5199 | a pending status, then don't resume any threads - we can just | |
5200 | report the pending status. Make sure to queue any signals that | |
5201 | would otherwise be sent. In non-stop mode, we'll apply this | |
5202 | logic to each thread individually. We consume all pending events | |
5203 | before considering to start a step-over (in all-stop). */ | |
5204 | any_pending = 0; | |
bd99dc85 | 5205 | if (!non_stop) |
d86d4aaf | 5206 | find_inferior (&all_threads, resume_status_pending_p, &any_pending); |
d50171e4 PA |
5207 | |
5208 | /* If there is a thread which would otherwise be resumed, which is | |
5209 | stopped at a breakpoint that needs stepping over, then don't | |
5210 | resume any threads - have it step over the breakpoint with all | |
5211 | other threads stopped, then resume all threads again. Make sure | |
5212 | to queue any signals that would otherwise be delivered or | |
5213 | queued. */ | |
5214 | if (!any_pending && supports_breakpoints ()) | |
5215 | need_step_over | |
d86d4aaf DE |
5216 | = (struct thread_info *) find_inferior (&all_threads, |
5217 | need_step_over_p, NULL); | |
d50171e4 PA |
5218 | |
5219 | leave_all_stopped = (need_step_over != NULL || any_pending); | |
5220 | ||
5221 | if (debug_threads) | |
5222 | { | |
5223 | if (need_step_over != NULL) | |
87ce2a04 | 5224 | debug_printf ("Not resuming all, need step over\n"); |
d50171e4 | 5225 | else if (any_pending) |
87ce2a04 DE |
5226 | debug_printf ("Not resuming, all-stop and found " |
5227 | "an LWP with pending status\n"); | |
d50171e4 | 5228 | else |
87ce2a04 | 5229 | debug_printf ("Resuming, no pending status or step over needed\n"); |
d50171e4 PA |
5230 | } |
5231 | ||
5232 | /* Even if we're leaving threads stopped, queue all signals we'd | |
5233 | otherwise deliver. */ | |
5234 | find_inferior (&all_threads, linux_resume_one_thread, &leave_all_stopped); | |
5235 | ||
5236 | if (need_step_over) | |
d86d4aaf | 5237 | start_step_over (get_thread_lwp (need_step_over)); |
87ce2a04 DE |
5238 | |
5239 | if (debug_threads) | |
5240 | { | |
5241 | debug_printf ("linux_resume done\n"); | |
5242 | debug_exit (); | |
5243 | } | |
1bebeeca PA |
5244 | |
5245 | /* We may have events that were pending that can/should be sent to | |
5246 | the client now. Trigger a linux_wait call. */ | |
5247 | if (target_is_async_p ()) | |
5248 | async_file_mark (); | |
d50171e4 PA |
5249 | } |
5250 | ||
5251 | /* This function is called once per thread. We check the thread's | |
5252 | last resume request, which will tell us whether to resume, step, or | |
5253 | leave the thread stopped. Any signal the client requested to be | |
5254 | delivered has already been enqueued at this point. | |
5255 | ||
5256 | If any thread that GDB wants running is stopped at an internal | |
5257 | breakpoint that needs stepping over, we start a step-over operation | |
5258 | on that particular thread, and leave all others stopped. */ | |
5259 | ||
7984d532 PA |
5260 | static int |
5261 | proceed_one_lwp (struct inferior_list_entry *entry, void *except) | |
d50171e4 | 5262 | { |
d86d4aaf DE |
5263 | struct thread_info *thread = (struct thread_info *) entry; |
5264 | struct lwp_info *lwp = get_thread_lwp (thread); | |
d50171e4 PA |
5265 | int step; |
5266 | ||
7984d532 PA |
5267 | if (lwp == except) |
5268 | return 0; | |
d50171e4 PA |
5269 | |
5270 | if (debug_threads) | |
d86d4aaf | 5271 | debug_printf ("proceed_one_lwp: lwp %ld\n", lwpid_of (thread)); |
d50171e4 PA |
5272 | |
5273 | if (!lwp->stopped) | |
5274 | { | |
5275 | if (debug_threads) | |
d86d4aaf | 5276 | debug_printf (" LWP %ld already running\n", lwpid_of (thread)); |
7984d532 | 5277 | return 0; |
d50171e4 PA |
5278 | } |
5279 | ||
02fc4de7 PA |
5280 | if (thread->last_resume_kind == resume_stop |
5281 | && thread->last_status.kind != TARGET_WAITKIND_IGNORE) | |
d50171e4 PA |
5282 | { |
5283 | if (debug_threads) | |
87ce2a04 | 5284 | debug_printf (" client wants LWP to remain %ld stopped\n", |
d86d4aaf | 5285 | lwpid_of (thread)); |
7984d532 | 5286 | return 0; |
d50171e4 PA |
5287 | } |
5288 | ||
5289 | if (lwp->status_pending_p) | |
5290 | { | |
5291 | if (debug_threads) | |
87ce2a04 | 5292 | debug_printf (" LWP %ld has pending status, leaving stopped\n", |
d86d4aaf | 5293 | lwpid_of (thread)); |
7984d532 | 5294 | return 0; |
d50171e4 PA |
5295 | } |
5296 | ||
7984d532 PA |
5297 | gdb_assert (lwp->suspended >= 0); |
5298 | ||
d50171e4 PA |
5299 | if (lwp->suspended) |
5300 | { | |
5301 | if (debug_threads) | |
d86d4aaf | 5302 | debug_printf (" LWP %ld is suspended\n", lwpid_of (thread)); |
7984d532 | 5303 | return 0; |
d50171e4 PA |
5304 | } |
5305 | ||
1a981360 PA |
5306 | if (thread->last_resume_kind == resume_stop |
5307 | && lwp->pending_signals_to_report == NULL | |
229d26fc SM |
5308 | && (lwp->collecting_fast_tracepoint |
5309 | == fast_tpoint_collect_result::not_collecting)) | |
02fc4de7 PA |
5310 | { |
5311 | /* We haven't reported this LWP as stopped yet (otherwise, the | |
5312 | last_status.kind check above would catch it, and we wouldn't | |
5313 | reach here. This LWP may have been momentarily paused by a | |
5314 | stop_all_lwps call while handling for example, another LWP's | |
5315 | step-over. In that case, the pending expected SIGSTOP signal | |
5316 | that was queued at vCont;t handling time will have already | |
5317 | been consumed by wait_for_sigstop, and so we need to requeue | |
5318 | another one here. Note that if the LWP already has a SIGSTOP | |
5319 | pending, this is a no-op. */ | |
5320 | ||
5321 | if (debug_threads) | |
87ce2a04 DE |
5322 | debug_printf ("Client wants LWP %ld to stop. " |
5323 | "Making sure it has a SIGSTOP pending\n", | |
d86d4aaf | 5324 | lwpid_of (thread)); |
02fc4de7 PA |
5325 | |
5326 | send_sigstop (lwp); | |
5327 | } | |
5328 | ||
863d01bd PA |
5329 | if (thread->last_resume_kind == resume_step) |
5330 | { | |
5331 | if (debug_threads) | |
5332 | debug_printf (" stepping LWP %ld, client wants it stepping\n", | |
5333 | lwpid_of (thread)); | |
8901d193 | 5334 | |
3b9a79ef | 5335 | /* If resume_step is requested by GDB, install single-step |
8901d193 | 5336 | breakpoints when the thread is about to be actually resumed if |
3b9a79ef YQ |
5337 | the single-step breakpoints weren't removed. */ |
5338 | if (can_software_single_step () | |
5339 | && !has_single_step_breakpoints (thread)) | |
8901d193 YQ |
5340 | install_software_single_step_breakpoints (lwp); |
5341 | ||
5342 | step = maybe_hw_step (thread); | |
863d01bd PA |
5343 | } |
5344 | else if (lwp->bp_reinsert != 0) | |
5345 | { | |
5346 | if (debug_threads) | |
5347 | debug_printf (" stepping LWP %ld, reinsert set\n", | |
5348 | lwpid_of (thread)); | |
f79b145d YQ |
5349 | |
5350 | step = maybe_hw_step (thread); | |
863d01bd PA |
5351 | } |
5352 | else | |
5353 | step = 0; | |
5354 | ||
d50171e4 | 5355 | linux_resume_one_lwp (lwp, step, 0, NULL); |
7984d532 PA |
5356 | return 0; |
5357 | } | |
5358 | ||
5359 | static int | |
5360 | unsuspend_and_proceed_one_lwp (struct inferior_list_entry *entry, void *except) | |
5361 | { | |
d86d4aaf DE |
5362 | struct thread_info *thread = (struct thread_info *) entry; |
5363 | struct lwp_info *lwp = get_thread_lwp (thread); | |
7984d532 PA |
5364 | |
5365 | if (lwp == except) | |
5366 | return 0; | |
5367 | ||
863d01bd | 5368 | lwp_suspended_decr (lwp); |
7984d532 PA |
5369 | |
5370 | return proceed_one_lwp (entry, except); | |
d50171e4 PA |
5371 | } |
5372 | ||
5373 | /* When we finish a step-over, set threads running again. If there's | |
5374 | another thread that may need a step-over, now's the time to start | |
5375 | it. Eventually, we'll move all threads past their breakpoints. */ | |
5376 | ||
5377 | static void | |
5378 | proceed_all_lwps (void) | |
5379 | { | |
d86d4aaf | 5380 | struct thread_info *need_step_over; |
d50171e4 PA |
5381 | |
5382 | /* If there is a thread which would otherwise be resumed, which is | |
5383 | stopped at a breakpoint that needs stepping over, then don't | |
5384 | resume any threads - have it step over the breakpoint with all | |
5385 | other threads stopped, then resume all threads again. */ | |
5386 | ||
5387 | if (supports_breakpoints ()) | |
5388 | { | |
5389 | need_step_over | |
d86d4aaf DE |
5390 | = (struct thread_info *) find_inferior (&all_threads, |
5391 | need_step_over_p, NULL); | |
d50171e4 PA |
5392 | |
5393 | if (need_step_over != NULL) | |
5394 | { | |
5395 | if (debug_threads) | |
87ce2a04 DE |
5396 | debug_printf ("proceed_all_lwps: found " |
5397 | "thread %ld needing a step-over\n", | |
5398 | lwpid_of (need_step_over)); | |
d50171e4 | 5399 | |
d86d4aaf | 5400 | start_step_over (get_thread_lwp (need_step_over)); |
d50171e4 PA |
5401 | return; |
5402 | } | |
5403 | } | |
5544ad89 | 5404 | |
d50171e4 | 5405 | if (debug_threads) |
87ce2a04 | 5406 | debug_printf ("Proceeding, no step-over needed\n"); |
d50171e4 | 5407 | |
d86d4aaf | 5408 | find_inferior (&all_threads, proceed_one_lwp, NULL); |
d50171e4 PA |
5409 | } |
5410 | ||
5411 | /* Stopped LWPs that the client wanted to be running, that don't have | |
5412 | pending statuses, are set to run again, except for EXCEPT, if not | |
5413 | NULL. This undoes a stop_all_lwps call. */ | |
5414 | ||
5415 | static void | |
7984d532 | 5416 | unstop_all_lwps (int unsuspend, struct lwp_info *except) |
d50171e4 | 5417 | { |
5544ad89 DJ |
5418 | if (debug_threads) |
5419 | { | |
87ce2a04 | 5420 | debug_enter (); |
d50171e4 | 5421 | if (except) |
87ce2a04 | 5422 | debug_printf ("unstopping all lwps, except=(LWP %ld)\n", |
d86d4aaf | 5423 | lwpid_of (get_lwp_thread (except))); |
5544ad89 | 5424 | else |
87ce2a04 | 5425 | debug_printf ("unstopping all lwps\n"); |
5544ad89 DJ |
5426 | } |
5427 | ||
7984d532 | 5428 | if (unsuspend) |
d86d4aaf | 5429 | find_inferior (&all_threads, unsuspend_and_proceed_one_lwp, except); |
7984d532 | 5430 | else |
d86d4aaf | 5431 | find_inferior (&all_threads, proceed_one_lwp, except); |
87ce2a04 DE |
5432 | |
5433 | if (debug_threads) | |
5434 | { | |
5435 | debug_printf ("unstop_all_lwps done\n"); | |
5436 | debug_exit (); | |
5437 | } | |
0d62e5e8 DJ |
5438 | } |
5439 | ||
58caa3dc DJ |
5440 | |
5441 | #ifdef HAVE_LINUX_REGSETS | |
5442 | ||
1faeff08 MR |
5443 | #define use_linux_regsets 1 |
5444 | ||
030031ee PA |
5445 | /* Returns true if REGSET has been disabled. */ |
5446 | ||
5447 | static int | |
5448 | regset_disabled (struct regsets_info *info, struct regset_info *regset) | |
5449 | { | |
5450 | return (info->disabled_regsets != NULL | |
5451 | && info->disabled_regsets[regset - info->regsets]); | |
5452 | } | |
5453 | ||
5454 | /* Disable REGSET. */ | |
5455 | ||
5456 | static void | |
5457 | disable_regset (struct regsets_info *info, struct regset_info *regset) | |
5458 | { | |
5459 | int dr_offset; | |
5460 | ||
5461 | dr_offset = regset - info->regsets; | |
5462 | if (info->disabled_regsets == NULL) | |
224c3ddb | 5463 | info->disabled_regsets = (char *) xcalloc (1, info->num_regsets); |
030031ee PA |
5464 | info->disabled_regsets[dr_offset] = 1; |
5465 | } | |
5466 | ||
58caa3dc | 5467 | static int |
3aee8918 PA |
5468 | regsets_fetch_inferior_registers (struct regsets_info *regsets_info, |
5469 | struct regcache *regcache) | |
58caa3dc DJ |
5470 | { |
5471 | struct regset_info *regset; | |
e9d25b98 | 5472 | int saw_general_regs = 0; |
95954743 | 5473 | int pid; |
1570b33e | 5474 | struct iovec iov; |
58caa3dc | 5475 | |
0bfdf32f | 5476 | pid = lwpid_of (current_thread); |
28eef672 | 5477 | for (regset = regsets_info->regsets; regset->size >= 0; regset++) |
58caa3dc | 5478 | { |
1570b33e L |
5479 | void *buf, *data; |
5480 | int nt_type, res; | |
58caa3dc | 5481 | |
030031ee | 5482 | if (regset->size == 0 || regset_disabled (regsets_info, regset)) |
28eef672 | 5483 | continue; |
58caa3dc | 5484 | |
bca929d3 | 5485 | buf = xmalloc (regset->size); |
1570b33e L |
5486 | |
5487 | nt_type = regset->nt_type; | |
5488 | if (nt_type) | |
5489 | { | |
5490 | iov.iov_base = buf; | |
5491 | iov.iov_len = regset->size; | |
5492 | data = (void *) &iov; | |
5493 | } | |
5494 | else | |
5495 | data = buf; | |
5496 | ||
dfb64f85 | 5497 | #ifndef __sparc__ |
f15f9948 | 5498 | res = ptrace (regset->get_request, pid, |
b8e1b30e | 5499 | (PTRACE_TYPE_ARG3) (long) nt_type, data); |
dfb64f85 | 5500 | #else |
1570b33e | 5501 | res = ptrace (regset->get_request, pid, data, nt_type); |
dfb64f85 | 5502 | #endif |
58caa3dc DJ |
5503 | if (res < 0) |
5504 | { | |
5505 | if (errno == EIO) | |
5506 | { | |
52fa2412 | 5507 | /* If we get EIO on a regset, do not try it again for |
3aee8918 | 5508 | this process mode. */ |
030031ee | 5509 | disable_regset (regsets_info, regset); |
58caa3dc | 5510 | } |
e5a9158d AA |
5511 | else if (errno == ENODATA) |
5512 | { | |
5513 | /* ENODATA may be returned if the regset is currently | |
5514 | not "active". This can happen in normal operation, | |
5515 | so suppress the warning in this case. */ | |
5516 | } | |
fcd4a73d YQ |
5517 | else if (errno == ESRCH) |
5518 | { | |
5519 | /* At this point, ESRCH should mean the process is | |
5520 | already gone, in which case we simply ignore attempts | |
5521 | to read its registers. */ | |
5522 | } | |
58caa3dc DJ |
5523 | else |
5524 | { | |
0d62e5e8 | 5525 | char s[256]; |
95954743 PA |
5526 | sprintf (s, "ptrace(regsets_fetch_inferior_registers) PID=%d", |
5527 | pid); | |
0d62e5e8 | 5528 | perror (s); |
58caa3dc DJ |
5529 | } |
5530 | } | |
098dbe61 AA |
5531 | else |
5532 | { | |
5533 | if (regset->type == GENERAL_REGS) | |
5534 | saw_general_regs = 1; | |
5535 | regset->store_function (regcache, buf); | |
5536 | } | |
fdeb2a12 | 5537 | free (buf); |
58caa3dc | 5538 | } |
e9d25b98 DJ |
5539 | if (saw_general_regs) |
5540 | return 0; | |
5541 | else | |
5542 | return 1; | |
58caa3dc DJ |
5543 | } |
5544 | ||
5545 | static int | |
3aee8918 PA |
5546 | regsets_store_inferior_registers (struct regsets_info *regsets_info, |
5547 | struct regcache *regcache) | |
58caa3dc DJ |
5548 | { |
5549 | struct regset_info *regset; | |
e9d25b98 | 5550 | int saw_general_regs = 0; |
95954743 | 5551 | int pid; |
1570b33e | 5552 | struct iovec iov; |
58caa3dc | 5553 | |
0bfdf32f | 5554 | pid = lwpid_of (current_thread); |
28eef672 | 5555 | for (regset = regsets_info->regsets; regset->size >= 0; regset++) |
58caa3dc | 5556 | { |
1570b33e L |
5557 | void *buf, *data; |
5558 | int nt_type, res; | |
58caa3dc | 5559 | |
feea5f36 AA |
5560 | if (regset->size == 0 || regset_disabled (regsets_info, regset) |
5561 | || regset->fill_function == NULL) | |
28eef672 | 5562 | continue; |
58caa3dc | 5563 | |
bca929d3 | 5564 | buf = xmalloc (regset->size); |
545587ee DJ |
5565 | |
5566 | /* First fill the buffer with the current register set contents, | |
5567 | in case there are any items in the kernel's regset that are | |
5568 | not in gdbserver's regcache. */ | |
1570b33e L |
5569 | |
5570 | nt_type = regset->nt_type; | |
5571 | if (nt_type) | |
5572 | { | |
5573 | iov.iov_base = buf; | |
5574 | iov.iov_len = regset->size; | |
5575 | data = (void *) &iov; | |
5576 | } | |
5577 | else | |
5578 | data = buf; | |
5579 | ||
dfb64f85 | 5580 | #ifndef __sparc__ |
f15f9948 | 5581 | res = ptrace (regset->get_request, pid, |
b8e1b30e | 5582 | (PTRACE_TYPE_ARG3) (long) nt_type, data); |
dfb64f85 | 5583 | #else |
689cc2ae | 5584 | res = ptrace (regset->get_request, pid, data, nt_type); |
dfb64f85 | 5585 | #endif |
545587ee DJ |
5586 | |
5587 | if (res == 0) | |
5588 | { | |
5589 | /* Then overlay our cached registers on that. */ | |
442ea881 | 5590 | regset->fill_function (regcache, buf); |
545587ee DJ |
5591 | |
5592 | /* Only now do we write the register set. */ | |
dfb64f85 | 5593 | #ifndef __sparc__ |
f15f9948 | 5594 | res = ptrace (regset->set_request, pid, |
b8e1b30e | 5595 | (PTRACE_TYPE_ARG3) (long) nt_type, data); |
dfb64f85 | 5596 | #else |
1570b33e | 5597 | res = ptrace (regset->set_request, pid, data, nt_type); |
dfb64f85 | 5598 | #endif |
545587ee DJ |
5599 | } |
5600 | ||
58caa3dc DJ |
5601 | if (res < 0) |
5602 | { | |
5603 | if (errno == EIO) | |
5604 | { | |
52fa2412 | 5605 | /* If we get EIO on a regset, do not try it again for |
3aee8918 | 5606 | this process mode. */ |
030031ee | 5607 | disable_regset (regsets_info, regset); |
58caa3dc | 5608 | } |
3221518c UW |
5609 | else if (errno == ESRCH) |
5610 | { | |
1b3f6016 PA |
5611 | /* At this point, ESRCH should mean the process is |
5612 | already gone, in which case we simply ignore attempts | |
5613 | to change its registers. See also the related | |
5614 | comment in linux_resume_one_lwp. */ | |
fdeb2a12 | 5615 | free (buf); |
3221518c UW |
5616 | return 0; |
5617 | } | |
58caa3dc DJ |
5618 | else |
5619 | { | |
ce3a066d | 5620 | perror ("Warning: ptrace(regsets_store_inferior_registers)"); |
58caa3dc DJ |
5621 | } |
5622 | } | |
e9d25b98 DJ |
5623 | else if (regset->type == GENERAL_REGS) |
5624 | saw_general_regs = 1; | |
09ec9b38 | 5625 | free (buf); |
58caa3dc | 5626 | } |
e9d25b98 DJ |
5627 | if (saw_general_regs) |
5628 | return 0; | |
5629 | else | |
5630 | return 1; | |
58caa3dc DJ |
5631 | } |
5632 | ||
1faeff08 | 5633 | #else /* !HAVE_LINUX_REGSETS */ |
58caa3dc | 5634 | |
1faeff08 | 5635 | #define use_linux_regsets 0 |
3aee8918 PA |
5636 | #define regsets_fetch_inferior_registers(regsets_info, regcache) 1 |
5637 | #define regsets_store_inferior_registers(regsets_info, regcache) 1 | |
58caa3dc | 5638 | |
58caa3dc | 5639 | #endif |
1faeff08 MR |
5640 | |
5641 | /* Return 1 if register REGNO is supported by one of the regset ptrace | |
5642 | calls or 0 if it has to be transferred individually. */ | |
5643 | ||
5644 | static int | |
3aee8918 | 5645 | linux_register_in_regsets (const struct regs_info *regs_info, int regno) |
1faeff08 MR |
5646 | { |
5647 | unsigned char mask = 1 << (regno % 8); | |
5648 | size_t index = regno / 8; | |
5649 | ||
5650 | return (use_linux_regsets | |
3aee8918 PA |
5651 | && (regs_info->regset_bitmap == NULL |
5652 | || (regs_info->regset_bitmap[index] & mask) != 0)); | |
1faeff08 MR |
5653 | } |
5654 | ||
58caa3dc | 5655 | #ifdef HAVE_LINUX_USRREGS |
1faeff08 | 5656 | |
5b3da067 | 5657 | static int |
3aee8918 | 5658 | register_addr (const struct usrregs_info *usrregs, int regnum) |
1faeff08 MR |
5659 | { |
5660 | int addr; | |
5661 | ||
3aee8918 | 5662 | if (regnum < 0 || regnum >= usrregs->num_regs) |
1faeff08 MR |
5663 | error ("Invalid register number %d.", regnum); |
5664 | ||
3aee8918 | 5665 | addr = usrregs->regmap[regnum]; |
1faeff08 MR |
5666 | |
5667 | return addr; | |
5668 | } | |
5669 | ||
5670 | /* Fetch one register. */ | |
5671 | static void | |
3aee8918 PA |
5672 | fetch_register (const struct usrregs_info *usrregs, |
5673 | struct regcache *regcache, int regno) | |
1faeff08 MR |
5674 | { |
5675 | CORE_ADDR regaddr; | |
5676 | int i, size; | |
5677 | char *buf; | |
5678 | int pid; | |
5679 | ||
3aee8918 | 5680 | if (regno >= usrregs->num_regs) |
1faeff08 MR |
5681 | return; |
5682 | if ((*the_low_target.cannot_fetch_register) (regno)) | |
5683 | return; | |
5684 | ||
3aee8918 | 5685 | regaddr = register_addr (usrregs, regno); |
1faeff08 MR |
5686 | if (regaddr == -1) |
5687 | return; | |
5688 | ||
3aee8918 PA |
5689 | size = ((register_size (regcache->tdesc, regno) |
5690 | + sizeof (PTRACE_XFER_TYPE) - 1) | |
1faeff08 | 5691 | & -sizeof (PTRACE_XFER_TYPE)); |
224c3ddb | 5692 | buf = (char *) alloca (size); |
1faeff08 | 5693 | |
0bfdf32f | 5694 | pid = lwpid_of (current_thread); |
1faeff08 MR |
5695 | for (i = 0; i < size; i += sizeof (PTRACE_XFER_TYPE)) |
5696 | { | |
5697 | errno = 0; | |
5698 | *(PTRACE_XFER_TYPE *) (buf + i) = | |
5699 | ptrace (PTRACE_PEEKUSER, pid, | |
5700 | /* Coerce to a uintptr_t first to avoid potential gcc warning | |
5701 | of coercing an 8 byte integer to a 4 byte pointer. */ | |
b8e1b30e | 5702 | (PTRACE_TYPE_ARG3) (uintptr_t) regaddr, (PTRACE_TYPE_ARG4) 0); |
1faeff08 MR |
5703 | regaddr += sizeof (PTRACE_XFER_TYPE); |
5704 | if (errno != 0) | |
5705 | error ("reading register %d: %s", regno, strerror (errno)); | |
5706 | } | |
5707 | ||
5708 | if (the_low_target.supply_ptrace_register) | |
5709 | the_low_target.supply_ptrace_register (regcache, regno, buf); | |
5710 | else | |
5711 | supply_register (regcache, regno, buf); | |
5712 | } | |
5713 | ||
5714 | /* Store one register. */ | |
5715 | static void | |
3aee8918 PA |
5716 | store_register (const struct usrregs_info *usrregs, |
5717 | struct regcache *regcache, int regno) | |
1faeff08 MR |
5718 | { |
5719 | CORE_ADDR regaddr; | |
5720 | int i, size; | |
5721 | char *buf; | |
5722 | int pid; | |
5723 | ||
3aee8918 | 5724 | if (regno >= usrregs->num_regs) |
1faeff08 MR |
5725 | return; |
5726 | if ((*the_low_target.cannot_store_register) (regno)) | |
5727 | return; | |
5728 | ||
3aee8918 | 5729 | regaddr = register_addr (usrregs, regno); |
1faeff08 MR |
5730 | if (regaddr == -1) |
5731 | return; | |
5732 | ||
3aee8918 PA |
5733 | size = ((register_size (regcache->tdesc, regno) |
5734 | + sizeof (PTRACE_XFER_TYPE) - 1) | |
1faeff08 | 5735 | & -sizeof (PTRACE_XFER_TYPE)); |
224c3ddb | 5736 | buf = (char *) alloca (size); |
1faeff08 MR |
5737 | memset (buf, 0, size); |
5738 | ||
5739 | if (the_low_target.collect_ptrace_register) | |
5740 | the_low_target.collect_ptrace_register (regcache, regno, buf); | |
5741 | else | |
5742 | collect_register (regcache, regno, buf); | |
5743 | ||
0bfdf32f | 5744 | pid = lwpid_of (current_thread); |
1faeff08 MR |
5745 | for (i = 0; i < size; i += sizeof (PTRACE_XFER_TYPE)) |
5746 | { | |
5747 | errno = 0; | |
5748 | ptrace (PTRACE_POKEUSER, pid, | |
5749 | /* Coerce to a uintptr_t first to avoid potential gcc warning | |
5750 | about coercing an 8 byte integer to a 4 byte pointer. */ | |
b8e1b30e LM |
5751 | (PTRACE_TYPE_ARG3) (uintptr_t) regaddr, |
5752 | (PTRACE_TYPE_ARG4) *(PTRACE_XFER_TYPE *) (buf + i)); | |
1faeff08 MR |
5753 | if (errno != 0) |
5754 | { | |
5755 | /* At this point, ESRCH should mean the process is | |
5756 | already gone, in which case we simply ignore attempts | |
5757 | to change its registers. See also the related | |
5758 | comment in linux_resume_one_lwp. */ | |
5759 | if (errno == ESRCH) | |
5760 | return; | |
5761 | ||
5762 | if ((*the_low_target.cannot_store_register) (regno) == 0) | |
5763 | error ("writing register %d: %s", regno, strerror (errno)); | |
5764 | } | |
5765 | regaddr += sizeof (PTRACE_XFER_TYPE); | |
5766 | } | |
5767 | } | |
5768 | ||
5769 | /* Fetch all registers, or just one, from the child process. | |
5770 | If REGNO is -1, do this for all registers, skipping any that are | |
5771 | assumed to have been retrieved by regsets_fetch_inferior_registers, | |
5772 | unless ALL is non-zero. | |
5773 | Otherwise, REGNO specifies which register (so we can save time). */ | |
5774 | static void | |
3aee8918 PA |
5775 | usr_fetch_inferior_registers (const struct regs_info *regs_info, |
5776 | struct regcache *regcache, int regno, int all) | |
1faeff08 | 5777 | { |
3aee8918 PA |
5778 | struct usrregs_info *usr = regs_info->usrregs; |
5779 | ||
1faeff08 MR |
5780 | if (regno == -1) |
5781 | { | |
3aee8918 PA |
5782 | for (regno = 0; regno < usr->num_regs; regno++) |
5783 | if (all || !linux_register_in_regsets (regs_info, regno)) | |
5784 | fetch_register (usr, regcache, regno); | |
1faeff08 MR |
5785 | } |
5786 | else | |
3aee8918 | 5787 | fetch_register (usr, regcache, regno); |
1faeff08 MR |
5788 | } |
5789 | ||
5790 | /* Store our register values back into the inferior. | |
5791 | If REGNO is -1, do this for all registers, skipping any that are | |
5792 | assumed to have been saved by regsets_store_inferior_registers, | |
5793 | unless ALL is non-zero. | |
5794 | Otherwise, REGNO specifies which register (so we can save time). */ | |
5795 | static void | |
3aee8918 PA |
5796 | usr_store_inferior_registers (const struct regs_info *regs_info, |
5797 | struct regcache *regcache, int regno, int all) | |
1faeff08 | 5798 | { |
3aee8918 PA |
5799 | struct usrregs_info *usr = regs_info->usrregs; |
5800 | ||
1faeff08 MR |
5801 | if (regno == -1) |
5802 | { | |
3aee8918 PA |
5803 | for (regno = 0; regno < usr->num_regs; regno++) |
5804 | if (all || !linux_register_in_regsets (regs_info, regno)) | |
5805 | store_register (usr, regcache, regno); | |
1faeff08 MR |
5806 | } |
5807 | else | |
3aee8918 | 5808 | store_register (usr, regcache, regno); |
1faeff08 MR |
5809 | } |
5810 | ||
5811 | #else /* !HAVE_LINUX_USRREGS */ | |
5812 | ||
3aee8918 PA |
5813 | #define usr_fetch_inferior_registers(regs_info, regcache, regno, all) do {} while (0) |
5814 | #define usr_store_inferior_registers(regs_info, regcache, regno, all) do {} while (0) | |
1faeff08 | 5815 | |
58caa3dc | 5816 | #endif |
1faeff08 MR |
5817 | |
5818 | ||
5b3da067 | 5819 | static void |
1faeff08 MR |
5820 | linux_fetch_registers (struct regcache *regcache, int regno) |
5821 | { | |
5822 | int use_regsets; | |
5823 | int all = 0; | |
3aee8918 | 5824 | const struct regs_info *regs_info = (*the_low_target.regs_info) (); |
1faeff08 MR |
5825 | |
5826 | if (regno == -1) | |
5827 | { | |
3aee8918 PA |
5828 | if (the_low_target.fetch_register != NULL |
5829 | && regs_info->usrregs != NULL) | |
5830 | for (regno = 0; regno < regs_info->usrregs->num_regs; regno++) | |
c14dfd32 PA |
5831 | (*the_low_target.fetch_register) (regcache, regno); |
5832 | ||
3aee8918 PA |
5833 | all = regsets_fetch_inferior_registers (regs_info->regsets_info, regcache); |
5834 | if (regs_info->usrregs != NULL) | |
5835 | usr_fetch_inferior_registers (regs_info, regcache, -1, all); | |
1faeff08 MR |
5836 | } |
5837 | else | |
5838 | { | |
c14dfd32 PA |
5839 | if (the_low_target.fetch_register != NULL |
5840 | && (*the_low_target.fetch_register) (regcache, regno)) | |
5841 | return; | |
5842 | ||
3aee8918 | 5843 | use_regsets = linux_register_in_regsets (regs_info, regno); |
1faeff08 | 5844 | if (use_regsets) |
3aee8918 PA |
5845 | all = regsets_fetch_inferior_registers (regs_info->regsets_info, |
5846 | regcache); | |
5847 | if ((!use_regsets || all) && regs_info->usrregs != NULL) | |
5848 | usr_fetch_inferior_registers (regs_info, regcache, regno, 1); | |
1faeff08 | 5849 | } |
58caa3dc DJ |
5850 | } |
5851 | ||
5b3da067 | 5852 | static void |
442ea881 | 5853 | linux_store_registers (struct regcache *regcache, int regno) |
58caa3dc | 5854 | { |
1faeff08 MR |
5855 | int use_regsets; |
5856 | int all = 0; | |
3aee8918 | 5857 | const struct regs_info *regs_info = (*the_low_target.regs_info) (); |
1faeff08 MR |
5858 | |
5859 | if (regno == -1) | |
5860 | { | |
3aee8918 PA |
5861 | all = regsets_store_inferior_registers (regs_info->regsets_info, |
5862 | regcache); | |
5863 | if (regs_info->usrregs != NULL) | |
5864 | usr_store_inferior_registers (regs_info, regcache, regno, all); | |
1faeff08 MR |
5865 | } |
5866 | else | |
5867 | { | |
3aee8918 | 5868 | use_regsets = linux_register_in_regsets (regs_info, regno); |
1faeff08 | 5869 | if (use_regsets) |
3aee8918 PA |
5870 | all = regsets_store_inferior_registers (regs_info->regsets_info, |
5871 | regcache); | |
5872 | if ((!use_regsets || all) && regs_info->usrregs != NULL) | |
5873 | usr_store_inferior_registers (regs_info, regcache, regno, 1); | |
1faeff08 | 5874 | } |
58caa3dc DJ |
5875 | } |
5876 | ||
da6d8c04 | 5877 | |
da6d8c04 DJ |
5878 | /* Copy LEN bytes from inferior's memory starting at MEMADDR |
5879 | to debugger memory starting at MYADDR. */ | |
5880 | ||
c3e735a6 | 5881 | static int |
f450004a | 5882 | linux_read_memory (CORE_ADDR memaddr, unsigned char *myaddr, int len) |
da6d8c04 | 5883 | { |
0bfdf32f | 5884 | int pid = lwpid_of (current_thread); |
ae3e2ccf SM |
5885 | PTRACE_XFER_TYPE *buffer; |
5886 | CORE_ADDR addr; | |
5887 | int count; | |
4934b29e | 5888 | char filename[64]; |
ae3e2ccf | 5889 | int i; |
4934b29e | 5890 | int ret; |
fd462a61 | 5891 | int fd; |
fd462a61 DJ |
5892 | |
5893 | /* Try using /proc. Don't bother for one word. */ | |
5894 | if (len >= 3 * sizeof (long)) | |
5895 | { | |
4934b29e MR |
5896 | int bytes; |
5897 | ||
fd462a61 DJ |
5898 | /* We could keep this file open and cache it - possibly one per |
5899 | thread. That requires some juggling, but is even faster. */ | |
95954743 | 5900 | sprintf (filename, "/proc/%d/mem", pid); |
fd462a61 DJ |
5901 | fd = open (filename, O_RDONLY | O_LARGEFILE); |
5902 | if (fd == -1) | |
5903 | goto no_proc; | |
5904 | ||
5905 | /* If pread64 is available, use it. It's faster if the kernel | |
5906 | supports it (only one syscall), and it's 64-bit safe even on | |
5907 | 32-bit platforms (for instance, SPARC debugging a SPARC64 | |
5908 | application). */ | |
5909 | #ifdef HAVE_PREAD64 | |
4934b29e | 5910 | bytes = pread64 (fd, myaddr, len, memaddr); |
fd462a61 | 5911 | #else |
4934b29e MR |
5912 | bytes = -1; |
5913 | if (lseek (fd, memaddr, SEEK_SET) != -1) | |
5914 | bytes = read (fd, myaddr, len); | |
fd462a61 | 5915 | #endif |
fd462a61 DJ |
5916 | |
5917 | close (fd); | |
4934b29e MR |
5918 | if (bytes == len) |
5919 | return 0; | |
5920 | ||
5921 | /* Some data was read, we'll try to get the rest with ptrace. */ | |
5922 | if (bytes > 0) | |
5923 | { | |
5924 | memaddr += bytes; | |
5925 | myaddr += bytes; | |
5926 | len -= bytes; | |
5927 | } | |
fd462a61 | 5928 | } |
da6d8c04 | 5929 | |
fd462a61 | 5930 | no_proc: |
4934b29e MR |
5931 | /* Round starting address down to longword boundary. */ |
5932 | addr = memaddr & -(CORE_ADDR) sizeof (PTRACE_XFER_TYPE); | |
5933 | /* Round ending address up; get number of longwords that makes. */ | |
5934 | count = ((((memaddr + len) - addr) + sizeof (PTRACE_XFER_TYPE) - 1) | |
5935 | / sizeof (PTRACE_XFER_TYPE)); | |
5936 | /* Allocate buffer of that many longwords. */ | |
8d749320 | 5937 | buffer = XALLOCAVEC (PTRACE_XFER_TYPE, count); |
4934b29e | 5938 | |
da6d8c04 | 5939 | /* Read all the longwords */ |
4934b29e | 5940 | errno = 0; |
da6d8c04 DJ |
5941 | for (i = 0; i < count; i++, addr += sizeof (PTRACE_XFER_TYPE)) |
5942 | { | |
14ce3065 DE |
5943 | /* Coerce the 3rd arg to a uintptr_t first to avoid potential gcc warning |
5944 | about coercing an 8 byte integer to a 4 byte pointer. */ | |
5945 | buffer[i] = ptrace (PTRACE_PEEKTEXT, pid, | |
b8e1b30e LM |
5946 | (PTRACE_TYPE_ARG3) (uintptr_t) addr, |
5947 | (PTRACE_TYPE_ARG4) 0); | |
c3e735a6 | 5948 | if (errno) |
4934b29e | 5949 | break; |
da6d8c04 | 5950 | } |
4934b29e | 5951 | ret = errno; |
da6d8c04 DJ |
5952 | |
5953 | /* Copy appropriate bytes out of the buffer. */ | |
8d409d16 MR |
5954 | if (i > 0) |
5955 | { | |
5956 | i *= sizeof (PTRACE_XFER_TYPE); | |
5957 | i -= memaddr & (sizeof (PTRACE_XFER_TYPE) - 1); | |
5958 | memcpy (myaddr, | |
5959 | (char *) buffer + (memaddr & (sizeof (PTRACE_XFER_TYPE) - 1)), | |
5960 | i < len ? i : len); | |
5961 | } | |
c3e735a6 | 5962 | |
4934b29e | 5963 | return ret; |
da6d8c04 DJ |
5964 | } |
5965 | ||
93ae6fdc PA |
5966 | /* Copy LEN bytes of data from debugger memory at MYADDR to inferior's |
5967 | memory at MEMADDR. On failure (cannot write to the inferior) | |
f0ae6fc3 | 5968 | returns the value of errno. Always succeeds if LEN is zero. */ |
da6d8c04 | 5969 | |
ce3a066d | 5970 | static int |
f450004a | 5971 | linux_write_memory (CORE_ADDR memaddr, const unsigned char *myaddr, int len) |
da6d8c04 | 5972 | { |
ae3e2ccf | 5973 | int i; |
da6d8c04 | 5974 | /* Round starting address down to longword boundary. */ |
ae3e2ccf | 5975 | CORE_ADDR addr = memaddr & -(CORE_ADDR) sizeof (PTRACE_XFER_TYPE); |
da6d8c04 | 5976 | /* Round ending address up; get number of longwords that makes. */ |
ae3e2ccf | 5977 | int count |
493e2a69 MS |
5978 | = (((memaddr + len) - addr) + sizeof (PTRACE_XFER_TYPE) - 1) |
5979 | / sizeof (PTRACE_XFER_TYPE); | |
5980 | ||
da6d8c04 | 5981 | /* Allocate buffer of that many longwords. */ |
ae3e2ccf | 5982 | PTRACE_XFER_TYPE *buffer = XALLOCAVEC (PTRACE_XFER_TYPE, count); |
493e2a69 | 5983 | |
0bfdf32f | 5984 | int pid = lwpid_of (current_thread); |
da6d8c04 | 5985 | |
f0ae6fc3 PA |
5986 | if (len == 0) |
5987 | { | |
5988 | /* Zero length write always succeeds. */ | |
5989 | return 0; | |
5990 | } | |
5991 | ||
0d62e5e8 DJ |
5992 | if (debug_threads) |
5993 | { | |
58d6951d | 5994 | /* Dump up to four bytes. */ |
bf47e248 PA |
5995 | char str[4 * 2 + 1]; |
5996 | char *p = str; | |
5997 | int dump = len < 4 ? len : 4; | |
5998 | ||
5999 | for (i = 0; i < dump; i++) | |
6000 | { | |
6001 | sprintf (p, "%02x", myaddr[i]); | |
6002 | p += 2; | |
6003 | } | |
6004 | *p = '\0'; | |
6005 | ||
6006 | debug_printf ("Writing %s to 0x%08lx in process %d\n", | |
6007 | str, (long) memaddr, pid); | |
0d62e5e8 DJ |
6008 | } |
6009 | ||
da6d8c04 DJ |
6010 | /* Fill start and end extra bytes of buffer with existing memory data. */ |
6011 | ||
93ae6fdc | 6012 | errno = 0; |
14ce3065 DE |
6013 | /* Coerce the 3rd arg to a uintptr_t first to avoid potential gcc warning |
6014 | about coercing an 8 byte integer to a 4 byte pointer. */ | |
6015 | buffer[0] = ptrace (PTRACE_PEEKTEXT, pid, | |
b8e1b30e LM |
6016 | (PTRACE_TYPE_ARG3) (uintptr_t) addr, |
6017 | (PTRACE_TYPE_ARG4) 0); | |
93ae6fdc PA |
6018 | if (errno) |
6019 | return errno; | |
da6d8c04 DJ |
6020 | |
6021 | if (count > 1) | |
6022 | { | |
93ae6fdc | 6023 | errno = 0; |
da6d8c04 | 6024 | buffer[count - 1] |
95954743 | 6025 | = ptrace (PTRACE_PEEKTEXT, pid, |
14ce3065 DE |
6026 | /* Coerce to a uintptr_t first to avoid potential gcc warning |
6027 | about coercing an 8 byte integer to a 4 byte pointer. */ | |
b8e1b30e | 6028 | (PTRACE_TYPE_ARG3) (uintptr_t) (addr + (count - 1) |
14ce3065 | 6029 | * sizeof (PTRACE_XFER_TYPE)), |
b8e1b30e | 6030 | (PTRACE_TYPE_ARG4) 0); |
93ae6fdc PA |
6031 | if (errno) |
6032 | return errno; | |
da6d8c04 DJ |
6033 | } |
6034 | ||
93ae6fdc | 6035 | /* Copy data to be written over corresponding part of buffer. */ |
da6d8c04 | 6036 | |
493e2a69 MS |
6037 | memcpy ((char *) buffer + (memaddr & (sizeof (PTRACE_XFER_TYPE) - 1)), |
6038 | myaddr, len); | |
da6d8c04 DJ |
6039 | |
6040 | /* Write the entire buffer. */ | |
6041 | ||
6042 | for (i = 0; i < count; i++, addr += sizeof (PTRACE_XFER_TYPE)) | |
6043 | { | |
6044 | errno = 0; | |
14ce3065 DE |
6045 | ptrace (PTRACE_POKETEXT, pid, |
6046 | /* Coerce to a uintptr_t first to avoid potential gcc warning | |
6047 | about coercing an 8 byte integer to a 4 byte pointer. */ | |
b8e1b30e LM |
6048 | (PTRACE_TYPE_ARG3) (uintptr_t) addr, |
6049 | (PTRACE_TYPE_ARG4) buffer[i]); | |
da6d8c04 DJ |
6050 | if (errno) |
6051 | return errno; | |
6052 | } | |
6053 | ||
6054 | return 0; | |
6055 | } | |
2f2893d9 DJ |
6056 | |
6057 | static void | |
6058 | linux_look_up_symbols (void) | |
6059 | { | |
0d62e5e8 | 6060 | #ifdef USE_THREAD_DB |
95954743 PA |
6061 | struct process_info *proc = current_process (); |
6062 | ||
fe978cb0 | 6063 | if (proc->priv->thread_db != NULL) |
0d62e5e8 DJ |
6064 | return; |
6065 | ||
9b4c5f87 | 6066 | thread_db_init (); |
0d62e5e8 DJ |
6067 | #endif |
6068 | } | |
6069 | ||
e5379b03 | 6070 | static void |
ef57601b | 6071 | linux_request_interrupt (void) |
e5379b03 | 6072 | { |
78708b7c PA |
6073 | /* Send a SIGINT to the process group. This acts just like the user |
6074 | typed a ^C on the controlling terminal. */ | |
6075 | kill (-signal_pid, SIGINT); | |
e5379b03 DJ |
6076 | } |
6077 | ||
aa691b87 RM |
6078 | /* Copy LEN bytes from inferior's auxiliary vector starting at OFFSET |
6079 | to debugger memory starting at MYADDR. */ | |
6080 | ||
6081 | static int | |
f450004a | 6082 | linux_read_auxv (CORE_ADDR offset, unsigned char *myaddr, unsigned int len) |
aa691b87 RM |
6083 | { |
6084 | char filename[PATH_MAX]; | |
6085 | int fd, n; | |
0bfdf32f | 6086 | int pid = lwpid_of (current_thread); |
aa691b87 | 6087 | |
6cebaf6e | 6088 | xsnprintf (filename, sizeof filename, "/proc/%d/auxv", pid); |
aa691b87 RM |
6089 | |
6090 | fd = open (filename, O_RDONLY); | |
6091 | if (fd < 0) | |
6092 | return -1; | |
6093 | ||
6094 | if (offset != (CORE_ADDR) 0 | |
6095 | && lseek (fd, (off_t) offset, SEEK_SET) != (off_t) offset) | |
6096 | n = -1; | |
6097 | else | |
6098 | n = read (fd, myaddr, len); | |
6099 | ||
6100 | close (fd); | |
6101 | ||
6102 | return n; | |
6103 | } | |
6104 | ||
d993e290 PA |
6105 | /* These breakpoint and watchpoint related wrapper functions simply |
6106 | pass on the function call if the target has registered a | |
6107 | corresponding function. */ | |
e013ee27 OF |
6108 | |
6109 | static int | |
802e8e6d PA |
6110 | linux_supports_z_point_type (char z_type) |
6111 | { | |
6112 | return (the_low_target.supports_z_point_type != NULL | |
6113 | && the_low_target.supports_z_point_type (z_type)); | |
6114 | } | |
6115 | ||
6116 | static int | |
6117 | linux_insert_point (enum raw_bkpt_type type, CORE_ADDR addr, | |
6118 | int size, struct raw_breakpoint *bp) | |
e013ee27 | 6119 | { |
c8f4bfdd YQ |
6120 | if (type == raw_bkpt_type_sw) |
6121 | return insert_memory_breakpoint (bp); | |
6122 | else if (the_low_target.insert_point != NULL) | |
802e8e6d | 6123 | return the_low_target.insert_point (type, addr, size, bp); |
e013ee27 OF |
6124 | else |
6125 | /* Unsupported (see target.h). */ | |
6126 | return 1; | |
6127 | } | |
6128 | ||
6129 | static int | |
802e8e6d PA |
6130 | linux_remove_point (enum raw_bkpt_type type, CORE_ADDR addr, |
6131 | int size, struct raw_breakpoint *bp) | |
e013ee27 | 6132 | { |
c8f4bfdd YQ |
6133 | if (type == raw_bkpt_type_sw) |
6134 | return remove_memory_breakpoint (bp); | |
6135 | else if (the_low_target.remove_point != NULL) | |
802e8e6d | 6136 | return the_low_target.remove_point (type, addr, size, bp); |
e013ee27 OF |
6137 | else |
6138 | /* Unsupported (see target.h). */ | |
6139 | return 1; | |
6140 | } | |
6141 | ||
3e572f71 PA |
6142 | /* Implement the to_stopped_by_sw_breakpoint target_ops |
6143 | method. */ | |
6144 | ||
6145 | static int | |
6146 | linux_stopped_by_sw_breakpoint (void) | |
6147 | { | |
6148 | struct lwp_info *lwp = get_thread_lwp (current_thread); | |
6149 | ||
6150 | return (lwp->stop_reason == TARGET_STOPPED_BY_SW_BREAKPOINT); | |
6151 | } | |
6152 | ||
6153 | /* Implement the to_supports_stopped_by_sw_breakpoint target_ops | |
6154 | method. */ | |
6155 | ||
6156 | static int | |
6157 | linux_supports_stopped_by_sw_breakpoint (void) | |
6158 | { | |
6159 | return USE_SIGTRAP_SIGINFO; | |
6160 | } | |
6161 | ||
6162 | /* Implement the to_stopped_by_hw_breakpoint target_ops | |
6163 | method. */ | |
6164 | ||
6165 | static int | |
6166 | linux_stopped_by_hw_breakpoint (void) | |
6167 | { | |
6168 | struct lwp_info *lwp = get_thread_lwp (current_thread); | |
6169 | ||
6170 | return (lwp->stop_reason == TARGET_STOPPED_BY_HW_BREAKPOINT); | |
6171 | } | |
6172 | ||
6173 | /* Implement the to_supports_stopped_by_hw_breakpoint target_ops | |
6174 | method. */ | |
6175 | ||
6176 | static int | |
6177 | linux_supports_stopped_by_hw_breakpoint (void) | |
6178 | { | |
6179 | return USE_SIGTRAP_SIGINFO; | |
6180 | } | |
6181 | ||
70b90b91 | 6182 | /* Implement the supports_hardware_single_step target_ops method. */ |
45614f15 YQ |
6183 | |
6184 | static int | |
70b90b91 | 6185 | linux_supports_hardware_single_step (void) |
45614f15 | 6186 | { |
45614f15 YQ |
6187 | return can_hardware_single_step (); |
6188 | } | |
6189 | ||
7d00775e AT |
6190 | static int |
6191 | linux_supports_software_single_step (void) | |
6192 | { | |
6193 | return can_software_single_step (); | |
6194 | } | |
6195 | ||
e013ee27 OF |
6196 | static int |
6197 | linux_stopped_by_watchpoint (void) | |
6198 | { | |
0bfdf32f | 6199 | struct lwp_info *lwp = get_thread_lwp (current_thread); |
c3adc08c | 6200 | |
15c66dd6 | 6201 | return lwp->stop_reason == TARGET_STOPPED_BY_WATCHPOINT; |
e013ee27 OF |
6202 | } |
6203 | ||
6204 | static CORE_ADDR | |
6205 | linux_stopped_data_address (void) | |
6206 | { | |
0bfdf32f | 6207 | struct lwp_info *lwp = get_thread_lwp (current_thread); |
c3adc08c PA |
6208 | |
6209 | return lwp->stopped_data_address; | |
e013ee27 OF |
6210 | } |
6211 | ||
db0dfaa0 LM |
6212 | #if defined(__UCLIBC__) && defined(HAS_NOMMU) \ |
6213 | && defined(PT_TEXT_ADDR) && defined(PT_DATA_ADDR) \ | |
6214 | && defined(PT_TEXT_END_ADDR) | |
6215 | ||
6216 | /* This is only used for targets that define PT_TEXT_ADDR, | |
6217 | PT_DATA_ADDR and PT_TEXT_END_ADDR. If those are not defined, supposedly | |
6218 | the target has different ways of acquiring this information, like | |
6219 | loadmaps. */ | |
52fb6437 NS |
6220 | |
6221 | /* Under uClinux, programs are loaded at non-zero offsets, which we need | |
6222 | to tell gdb about. */ | |
6223 | ||
6224 | static int | |
6225 | linux_read_offsets (CORE_ADDR *text_p, CORE_ADDR *data_p) | |
6226 | { | |
52fb6437 | 6227 | unsigned long text, text_end, data; |
62828379 | 6228 | int pid = lwpid_of (current_thread); |
52fb6437 NS |
6229 | |
6230 | errno = 0; | |
6231 | ||
b8e1b30e LM |
6232 | text = ptrace (PTRACE_PEEKUSER, pid, (PTRACE_TYPE_ARG3) PT_TEXT_ADDR, |
6233 | (PTRACE_TYPE_ARG4) 0); | |
6234 | text_end = ptrace (PTRACE_PEEKUSER, pid, (PTRACE_TYPE_ARG3) PT_TEXT_END_ADDR, | |
6235 | (PTRACE_TYPE_ARG4) 0); | |
6236 | data = ptrace (PTRACE_PEEKUSER, pid, (PTRACE_TYPE_ARG3) PT_DATA_ADDR, | |
6237 | (PTRACE_TYPE_ARG4) 0); | |
52fb6437 NS |
6238 | |
6239 | if (errno == 0) | |
6240 | { | |
6241 | /* Both text and data offsets produced at compile-time (and so | |
1b3f6016 PA |
6242 | used by gdb) are relative to the beginning of the program, |
6243 | with the data segment immediately following the text segment. | |
6244 | However, the actual runtime layout in memory may put the data | |
6245 | somewhere else, so when we send gdb a data base-address, we | |
6246 | use the real data base address and subtract the compile-time | |
6247 | data base-address from it (which is just the length of the | |
6248 | text segment). BSS immediately follows data in both | |
6249 | cases. */ | |
52fb6437 NS |
6250 | *text_p = text; |
6251 | *data_p = data - (text_end - text); | |
1b3f6016 | 6252 | |
52fb6437 NS |
6253 | return 1; |
6254 | } | |
52fb6437 NS |
6255 | return 0; |
6256 | } | |
6257 | #endif | |
6258 | ||
07e059b5 VP |
6259 | static int |
6260 | linux_qxfer_osdata (const char *annex, | |
1b3f6016 PA |
6261 | unsigned char *readbuf, unsigned const char *writebuf, |
6262 | CORE_ADDR offset, int len) | |
07e059b5 | 6263 | { |
d26e3629 | 6264 | return linux_common_xfer_osdata (annex, readbuf, offset, len); |
07e059b5 VP |
6265 | } |
6266 | ||
d0722149 DE |
6267 | /* Convert a native/host siginfo object, into/from the siginfo in the |
6268 | layout of the inferiors' architecture. */ | |
6269 | ||
6270 | static void | |
8adce034 | 6271 | siginfo_fixup (siginfo_t *siginfo, gdb_byte *inf_siginfo, int direction) |
d0722149 DE |
6272 | { |
6273 | int done = 0; | |
6274 | ||
6275 | if (the_low_target.siginfo_fixup != NULL) | |
6276 | done = the_low_target.siginfo_fixup (siginfo, inf_siginfo, direction); | |
6277 | ||
6278 | /* If there was no callback, or the callback didn't do anything, | |
6279 | then just do a straight memcpy. */ | |
6280 | if (!done) | |
6281 | { | |
6282 | if (direction == 1) | |
a5362b9a | 6283 | memcpy (siginfo, inf_siginfo, sizeof (siginfo_t)); |
d0722149 | 6284 | else |
a5362b9a | 6285 | memcpy (inf_siginfo, siginfo, sizeof (siginfo_t)); |
d0722149 DE |
6286 | } |
6287 | } | |
6288 | ||
4aa995e1 PA |
6289 | static int |
6290 | linux_xfer_siginfo (const char *annex, unsigned char *readbuf, | |
6291 | unsigned const char *writebuf, CORE_ADDR offset, int len) | |
6292 | { | |
d0722149 | 6293 | int pid; |
a5362b9a | 6294 | siginfo_t siginfo; |
8adce034 | 6295 | gdb_byte inf_siginfo[sizeof (siginfo_t)]; |
4aa995e1 | 6296 | |
0bfdf32f | 6297 | if (current_thread == NULL) |
4aa995e1 PA |
6298 | return -1; |
6299 | ||
0bfdf32f | 6300 | pid = lwpid_of (current_thread); |
4aa995e1 PA |
6301 | |
6302 | if (debug_threads) | |
87ce2a04 DE |
6303 | debug_printf ("%s siginfo for lwp %d.\n", |
6304 | readbuf != NULL ? "Reading" : "Writing", | |
6305 | pid); | |
4aa995e1 | 6306 | |
0adea5f7 | 6307 | if (offset >= sizeof (siginfo)) |
4aa995e1 PA |
6308 | return -1; |
6309 | ||
b8e1b30e | 6310 | if (ptrace (PTRACE_GETSIGINFO, pid, (PTRACE_TYPE_ARG3) 0, &siginfo) != 0) |
4aa995e1 PA |
6311 | return -1; |
6312 | ||
d0722149 DE |
6313 | /* When GDBSERVER is built as a 64-bit application, ptrace writes into |
6314 | SIGINFO an object with 64-bit layout. Since debugging a 32-bit | |
6315 | inferior with a 64-bit GDBSERVER should look the same as debugging it | |
6316 | with a 32-bit GDBSERVER, we need to convert it. */ | |
6317 | siginfo_fixup (&siginfo, inf_siginfo, 0); | |
6318 | ||
4aa995e1 PA |
6319 | if (offset + len > sizeof (siginfo)) |
6320 | len = sizeof (siginfo) - offset; | |
6321 | ||
6322 | if (readbuf != NULL) | |
d0722149 | 6323 | memcpy (readbuf, inf_siginfo + offset, len); |
4aa995e1 PA |
6324 | else |
6325 | { | |
d0722149 DE |
6326 | memcpy (inf_siginfo + offset, writebuf, len); |
6327 | ||
6328 | /* Convert back to ptrace layout before flushing it out. */ | |
6329 | siginfo_fixup (&siginfo, inf_siginfo, 1); | |
6330 | ||
b8e1b30e | 6331 | if (ptrace (PTRACE_SETSIGINFO, pid, (PTRACE_TYPE_ARG3) 0, &siginfo) != 0) |
4aa995e1 PA |
6332 | return -1; |
6333 | } | |
6334 | ||
6335 | return len; | |
6336 | } | |
6337 | ||
bd99dc85 PA |
6338 | /* SIGCHLD handler that serves two purposes: In non-stop/async mode, |
6339 | so we notice when children change state; as the handler for the | |
6340 | sigsuspend in my_waitpid. */ | |
6341 | ||
6342 | static void | |
6343 | sigchld_handler (int signo) | |
6344 | { | |
6345 | int old_errno = errno; | |
6346 | ||
6347 | if (debug_threads) | |
e581f2b4 PA |
6348 | { |
6349 | do | |
6350 | { | |
6351 | /* fprintf is not async-signal-safe, so call write | |
6352 | directly. */ | |
6353 | if (write (2, "sigchld_handler\n", | |
6354 | sizeof ("sigchld_handler\n") - 1) < 0) | |
6355 | break; /* just ignore */ | |
6356 | } while (0); | |
6357 | } | |
bd99dc85 PA |
6358 | |
6359 | if (target_is_async_p ()) | |
6360 | async_file_mark (); /* trigger a linux_wait */ | |
6361 | ||
6362 | errno = old_errno; | |
6363 | } | |
6364 | ||
6365 | static int | |
6366 | linux_supports_non_stop (void) | |
6367 | { | |
6368 | return 1; | |
6369 | } | |
6370 | ||
6371 | static int | |
6372 | linux_async (int enable) | |
6373 | { | |
7089dca4 | 6374 | int previous = target_is_async_p (); |
bd99dc85 | 6375 | |
8336d594 | 6376 | if (debug_threads) |
87ce2a04 DE |
6377 | debug_printf ("linux_async (%d), previous=%d\n", |
6378 | enable, previous); | |
8336d594 | 6379 | |
bd99dc85 PA |
6380 | if (previous != enable) |
6381 | { | |
6382 | sigset_t mask; | |
6383 | sigemptyset (&mask); | |
6384 | sigaddset (&mask, SIGCHLD); | |
6385 | ||
6386 | sigprocmask (SIG_BLOCK, &mask, NULL); | |
6387 | ||
6388 | if (enable) | |
6389 | { | |
6390 | if (pipe (linux_event_pipe) == -1) | |
aa96c426 GB |
6391 | { |
6392 | linux_event_pipe[0] = -1; | |
6393 | linux_event_pipe[1] = -1; | |
6394 | sigprocmask (SIG_UNBLOCK, &mask, NULL); | |
6395 | ||
6396 | warning ("creating event pipe failed."); | |
6397 | return previous; | |
6398 | } | |
bd99dc85 PA |
6399 | |
6400 | fcntl (linux_event_pipe[0], F_SETFL, O_NONBLOCK); | |
6401 | fcntl (linux_event_pipe[1], F_SETFL, O_NONBLOCK); | |
6402 | ||
6403 | /* Register the event loop handler. */ | |
6404 | add_file_handler (linux_event_pipe[0], | |
6405 | handle_target_event, NULL); | |
6406 | ||
6407 | /* Always trigger a linux_wait. */ | |
6408 | async_file_mark (); | |
6409 | } | |
6410 | else | |
6411 | { | |
6412 | delete_file_handler (linux_event_pipe[0]); | |
6413 | ||
6414 | close (linux_event_pipe[0]); | |
6415 | close (linux_event_pipe[1]); | |
6416 | linux_event_pipe[0] = -1; | |
6417 | linux_event_pipe[1] = -1; | |
6418 | } | |
6419 | ||
6420 | sigprocmask (SIG_UNBLOCK, &mask, NULL); | |
6421 | } | |
6422 | ||
6423 | return previous; | |
6424 | } | |
6425 | ||
6426 | static int | |
6427 | linux_start_non_stop (int nonstop) | |
6428 | { | |
6429 | /* Register or unregister from event-loop accordingly. */ | |
6430 | linux_async (nonstop); | |
aa96c426 GB |
6431 | |
6432 | if (target_is_async_p () != (nonstop != 0)) | |
6433 | return -1; | |
6434 | ||
bd99dc85 PA |
6435 | return 0; |
6436 | } | |
6437 | ||
cf8fd78b PA |
6438 | static int |
6439 | linux_supports_multi_process (void) | |
6440 | { | |
6441 | return 1; | |
6442 | } | |
6443 | ||
89245bc0 DB |
6444 | /* Check if fork events are supported. */ |
6445 | ||
6446 | static int | |
6447 | linux_supports_fork_events (void) | |
6448 | { | |
6449 | return linux_supports_tracefork (); | |
6450 | } | |
6451 | ||
6452 | /* Check if vfork events are supported. */ | |
6453 | ||
6454 | static int | |
6455 | linux_supports_vfork_events (void) | |
6456 | { | |
6457 | return linux_supports_tracefork (); | |
6458 | } | |
6459 | ||
94585166 DB |
6460 | /* Check if exec events are supported. */ |
6461 | ||
6462 | static int | |
6463 | linux_supports_exec_events (void) | |
6464 | { | |
6465 | return linux_supports_traceexec (); | |
6466 | } | |
6467 | ||
de0d863e DB |
6468 | /* Callback for 'find_inferior'. Set the (possibly changed) ptrace |
6469 | options for the specified lwp. */ | |
6470 | ||
6471 | static int | |
6472 | reset_lwp_ptrace_options_callback (struct inferior_list_entry *entry, | |
6473 | void *args) | |
6474 | { | |
6475 | struct thread_info *thread = (struct thread_info *) entry; | |
6476 | struct lwp_info *lwp = get_thread_lwp (thread); | |
6477 | ||
6478 | if (!lwp->stopped) | |
6479 | { | |
6480 | /* Stop the lwp so we can modify its ptrace options. */ | |
6481 | lwp->must_set_ptrace_flags = 1; | |
6482 | linux_stop_lwp (lwp); | |
6483 | } | |
6484 | else | |
6485 | { | |
6486 | /* Already stopped; go ahead and set the ptrace options. */ | |
6487 | struct process_info *proc = find_process_pid (pid_of (thread)); | |
6488 | int options = linux_low_ptrace_options (proc->attached); | |
6489 | ||
6490 | linux_enable_event_reporting (lwpid_of (thread), options); | |
6491 | lwp->must_set_ptrace_flags = 0; | |
6492 | } | |
6493 | ||
6494 | return 0; | |
6495 | } | |
6496 | ||
6497 | /* Target hook for 'handle_new_gdb_connection'. Causes a reset of the | |
6498 | ptrace flags for all inferiors. This is in case the new GDB connection | |
6499 | doesn't support the same set of events that the previous one did. */ | |
6500 | ||
6501 | static void | |
6502 | linux_handle_new_gdb_connection (void) | |
6503 | { | |
6504 | pid_t pid; | |
6505 | ||
6506 | /* Request that all the lwps reset their ptrace options. */ | |
6507 | find_inferior (&all_threads, reset_lwp_ptrace_options_callback , &pid); | |
6508 | } | |
6509 | ||
03583c20 UW |
6510 | static int |
6511 | linux_supports_disable_randomization (void) | |
6512 | { | |
6513 | #ifdef HAVE_PERSONALITY | |
6514 | return 1; | |
6515 | #else | |
6516 | return 0; | |
6517 | #endif | |
6518 | } | |
efcbbd14 | 6519 | |
d1feda86 YQ |
6520 | static int |
6521 | linux_supports_agent (void) | |
6522 | { | |
6523 | return 1; | |
6524 | } | |
6525 | ||
c2d6af84 PA |
6526 | static int |
6527 | linux_supports_range_stepping (void) | |
6528 | { | |
c3805894 YQ |
6529 | if (can_software_single_step ()) |
6530 | return 1; | |
c2d6af84 PA |
6531 | if (*the_low_target.supports_range_stepping == NULL) |
6532 | return 0; | |
6533 | ||
6534 | return (*the_low_target.supports_range_stepping) (); | |
6535 | } | |
6536 | ||
efcbbd14 UW |
6537 | /* Enumerate spufs IDs for process PID. */ |
6538 | static int | |
6539 | spu_enumerate_spu_ids (long pid, unsigned char *buf, CORE_ADDR offset, int len) | |
6540 | { | |
6541 | int pos = 0; | |
6542 | int written = 0; | |
6543 | char path[128]; | |
6544 | DIR *dir; | |
6545 | struct dirent *entry; | |
6546 | ||
6547 | sprintf (path, "/proc/%ld/fd", pid); | |
6548 | dir = opendir (path); | |
6549 | if (!dir) | |
6550 | return -1; | |
6551 | ||
6552 | rewinddir (dir); | |
6553 | while ((entry = readdir (dir)) != NULL) | |
6554 | { | |
6555 | struct stat st; | |
6556 | struct statfs stfs; | |
6557 | int fd; | |
6558 | ||
6559 | fd = atoi (entry->d_name); | |
6560 | if (!fd) | |
6561 | continue; | |
6562 | ||
6563 | sprintf (path, "/proc/%ld/fd/%d", pid, fd); | |
6564 | if (stat (path, &st) != 0) | |
6565 | continue; | |
6566 | if (!S_ISDIR (st.st_mode)) | |
6567 | continue; | |
6568 | ||
6569 | if (statfs (path, &stfs) != 0) | |
6570 | continue; | |
6571 | if (stfs.f_type != SPUFS_MAGIC) | |
6572 | continue; | |
6573 | ||
6574 | if (pos >= offset && pos + 4 <= offset + len) | |
6575 | { | |
6576 | *(unsigned int *)(buf + pos - offset) = fd; | |
6577 | written += 4; | |
6578 | } | |
6579 | pos += 4; | |
6580 | } | |
6581 | ||
6582 | closedir (dir); | |
6583 | return written; | |
6584 | } | |
6585 | ||
6586 | /* Implements the to_xfer_partial interface for the TARGET_OBJECT_SPU | |
6587 | object type, using the /proc file system. */ | |
6588 | static int | |
6589 | linux_qxfer_spu (const char *annex, unsigned char *readbuf, | |
6590 | unsigned const char *writebuf, | |
6591 | CORE_ADDR offset, int len) | |
6592 | { | |
0bfdf32f | 6593 | long pid = lwpid_of (current_thread); |
efcbbd14 UW |
6594 | char buf[128]; |
6595 | int fd = 0; | |
6596 | int ret = 0; | |
6597 | ||
6598 | if (!writebuf && !readbuf) | |
6599 | return -1; | |
6600 | ||
6601 | if (!*annex) | |
6602 | { | |
6603 | if (!readbuf) | |
6604 | return -1; | |
6605 | else | |
6606 | return spu_enumerate_spu_ids (pid, readbuf, offset, len); | |
6607 | } | |
6608 | ||
6609 | sprintf (buf, "/proc/%ld/fd/%s", pid, annex); | |
6610 | fd = open (buf, writebuf? O_WRONLY : O_RDONLY); | |
6611 | if (fd <= 0) | |
6612 | return -1; | |
6613 | ||
6614 | if (offset != 0 | |
6615 | && lseek (fd, (off_t) offset, SEEK_SET) != (off_t) offset) | |
6616 | { | |
6617 | close (fd); | |
6618 | return 0; | |
6619 | } | |
6620 | ||
6621 | if (writebuf) | |
6622 | ret = write (fd, writebuf, (size_t) len); | |
6623 | else | |
6624 | ret = read (fd, readbuf, (size_t) len); | |
6625 | ||
6626 | close (fd); | |
6627 | return ret; | |
6628 | } | |
6629 | ||
723b724b | 6630 | #if defined PT_GETDSBT || defined PTRACE_GETFDPIC |
78d85199 YQ |
6631 | struct target_loadseg |
6632 | { | |
6633 | /* Core address to which the segment is mapped. */ | |
6634 | Elf32_Addr addr; | |
6635 | /* VMA recorded in the program header. */ | |
6636 | Elf32_Addr p_vaddr; | |
6637 | /* Size of this segment in memory. */ | |
6638 | Elf32_Word p_memsz; | |
6639 | }; | |
6640 | ||
723b724b | 6641 | # if defined PT_GETDSBT |
78d85199 YQ |
6642 | struct target_loadmap |
6643 | { | |
6644 | /* Protocol version number, must be zero. */ | |
6645 | Elf32_Word version; | |
6646 | /* Pointer to the DSBT table, its size, and the DSBT index. */ | |
6647 | unsigned *dsbt_table; | |
6648 | unsigned dsbt_size, dsbt_index; | |
6649 | /* Number of segments in this map. */ | |
6650 | Elf32_Word nsegs; | |
6651 | /* The actual memory map. */ | |
6652 | struct target_loadseg segs[/*nsegs*/]; | |
6653 | }; | |
723b724b MF |
6654 | # define LINUX_LOADMAP PT_GETDSBT |
6655 | # define LINUX_LOADMAP_EXEC PTRACE_GETDSBT_EXEC | |
6656 | # define LINUX_LOADMAP_INTERP PTRACE_GETDSBT_INTERP | |
6657 | # else | |
6658 | struct target_loadmap | |
6659 | { | |
6660 | /* Protocol version number, must be zero. */ | |
6661 | Elf32_Half version; | |
6662 | /* Number of segments in this map. */ | |
6663 | Elf32_Half nsegs; | |
6664 | /* The actual memory map. */ | |
6665 | struct target_loadseg segs[/*nsegs*/]; | |
6666 | }; | |
6667 | # define LINUX_LOADMAP PTRACE_GETFDPIC | |
6668 | # define LINUX_LOADMAP_EXEC PTRACE_GETFDPIC_EXEC | |
6669 | # define LINUX_LOADMAP_INTERP PTRACE_GETFDPIC_INTERP | |
6670 | # endif | |
78d85199 | 6671 | |
78d85199 YQ |
6672 | static int |
6673 | linux_read_loadmap (const char *annex, CORE_ADDR offset, | |
6674 | unsigned char *myaddr, unsigned int len) | |
6675 | { | |
0bfdf32f | 6676 | int pid = lwpid_of (current_thread); |
78d85199 YQ |
6677 | int addr = -1; |
6678 | struct target_loadmap *data = NULL; | |
6679 | unsigned int actual_length, copy_length; | |
6680 | ||
6681 | if (strcmp (annex, "exec") == 0) | |
723b724b | 6682 | addr = (int) LINUX_LOADMAP_EXEC; |
78d85199 | 6683 | else if (strcmp (annex, "interp") == 0) |
723b724b | 6684 | addr = (int) LINUX_LOADMAP_INTERP; |
78d85199 YQ |
6685 | else |
6686 | return -1; | |
6687 | ||
723b724b | 6688 | if (ptrace (LINUX_LOADMAP, pid, addr, &data) != 0) |
78d85199 YQ |
6689 | return -1; |
6690 | ||
6691 | if (data == NULL) | |
6692 | return -1; | |
6693 | ||
6694 | actual_length = sizeof (struct target_loadmap) | |
6695 | + sizeof (struct target_loadseg) * data->nsegs; | |
6696 | ||
6697 | if (offset < 0 || offset > actual_length) | |
6698 | return -1; | |
6699 | ||
6700 | copy_length = actual_length - offset < len ? actual_length - offset : len; | |
6701 | memcpy (myaddr, (char *) data + offset, copy_length); | |
6702 | return copy_length; | |
6703 | } | |
723b724b MF |
6704 | #else |
6705 | # define linux_read_loadmap NULL | |
6706 | #endif /* defined PT_GETDSBT || defined PTRACE_GETFDPIC */ | |
78d85199 | 6707 | |
1570b33e | 6708 | static void |
06e03fff | 6709 | linux_process_qsupported (char **features, int count) |
1570b33e L |
6710 | { |
6711 | if (the_low_target.process_qsupported != NULL) | |
06e03fff | 6712 | the_low_target.process_qsupported (features, count); |
1570b33e L |
6713 | } |
6714 | ||
82075af2 JS |
6715 | static int |
6716 | linux_supports_catch_syscall (void) | |
6717 | { | |
6718 | return (the_low_target.get_syscall_trapinfo != NULL | |
6719 | && linux_supports_tracesysgood ()); | |
6720 | } | |
6721 | ||
ae91f625 MK |
6722 | static int |
6723 | linux_get_ipa_tdesc_idx (void) | |
6724 | { | |
6725 | if (the_low_target.get_ipa_tdesc_idx == NULL) | |
6726 | return 0; | |
6727 | ||
6728 | return (*the_low_target.get_ipa_tdesc_idx) (); | |
6729 | } | |
6730 | ||
219f2f23 PA |
6731 | static int |
6732 | linux_supports_tracepoints (void) | |
6733 | { | |
6734 | if (*the_low_target.supports_tracepoints == NULL) | |
6735 | return 0; | |
6736 | ||
6737 | return (*the_low_target.supports_tracepoints) (); | |
6738 | } | |
6739 | ||
6740 | static CORE_ADDR | |
6741 | linux_read_pc (struct regcache *regcache) | |
6742 | { | |
6743 | if (the_low_target.get_pc == NULL) | |
6744 | return 0; | |
6745 | ||
6746 | return (*the_low_target.get_pc) (regcache); | |
6747 | } | |
6748 | ||
6749 | static void | |
6750 | linux_write_pc (struct regcache *regcache, CORE_ADDR pc) | |
6751 | { | |
6752 | gdb_assert (the_low_target.set_pc != NULL); | |
6753 | ||
6754 | (*the_low_target.set_pc) (regcache, pc); | |
6755 | } | |
6756 | ||
8336d594 PA |
6757 | static int |
6758 | linux_thread_stopped (struct thread_info *thread) | |
6759 | { | |
6760 | return get_thread_lwp (thread)->stopped; | |
6761 | } | |
6762 | ||
6763 | /* This exposes stop-all-threads functionality to other modules. */ | |
6764 | ||
6765 | static void | |
7984d532 | 6766 | linux_pause_all (int freeze) |
8336d594 | 6767 | { |
7984d532 PA |
6768 | stop_all_lwps (freeze, NULL); |
6769 | } | |
6770 | ||
6771 | /* This exposes unstop-all-threads functionality to other gdbserver | |
6772 | modules. */ | |
6773 | ||
6774 | static void | |
6775 | linux_unpause_all (int unfreeze) | |
6776 | { | |
6777 | unstop_all_lwps (unfreeze, NULL); | |
8336d594 PA |
6778 | } |
6779 | ||
90d74c30 PA |
6780 | static int |
6781 | linux_prepare_to_access_memory (void) | |
6782 | { | |
6783 | /* Neither ptrace nor /proc/PID/mem allow accessing memory through a | |
6784 | running LWP. */ | |
6785 | if (non_stop) | |
6786 | linux_pause_all (1); | |
6787 | return 0; | |
6788 | } | |
6789 | ||
6790 | static void | |
0146f85b | 6791 | linux_done_accessing_memory (void) |
90d74c30 PA |
6792 | { |
6793 | /* Neither ptrace nor /proc/PID/mem allow accessing memory through a | |
6794 | running LWP. */ | |
6795 | if (non_stop) | |
6796 | linux_unpause_all (1); | |
6797 | } | |
6798 | ||
fa593d66 PA |
6799 | static int |
6800 | linux_install_fast_tracepoint_jump_pad (CORE_ADDR tpoint, CORE_ADDR tpaddr, | |
6801 | CORE_ADDR collector, | |
6802 | CORE_ADDR lockaddr, | |
6803 | ULONGEST orig_size, | |
6804 | CORE_ADDR *jump_entry, | |
405f8e94 SS |
6805 | CORE_ADDR *trampoline, |
6806 | ULONGEST *trampoline_size, | |
fa593d66 PA |
6807 | unsigned char *jjump_pad_insn, |
6808 | ULONGEST *jjump_pad_insn_size, | |
6809 | CORE_ADDR *adjusted_insn_addr, | |
405f8e94 SS |
6810 | CORE_ADDR *adjusted_insn_addr_end, |
6811 | char *err) | |
fa593d66 PA |
6812 | { |
6813 | return (*the_low_target.install_fast_tracepoint_jump_pad) | |
6814 | (tpoint, tpaddr, collector, lockaddr, orig_size, | |
405f8e94 SS |
6815 | jump_entry, trampoline, trampoline_size, |
6816 | jjump_pad_insn, jjump_pad_insn_size, | |
6817 | adjusted_insn_addr, adjusted_insn_addr_end, | |
6818 | err); | |
fa593d66 PA |
6819 | } |
6820 | ||
6a271cae PA |
6821 | static struct emit_ops * |
6822 | linux_emit_ops (void) | |
6823 | { | |
6824 | if (the_low_target.emit_ops != NULL) | |
6825 | return (*the_low_target.emit_ops) (); | |
6826 | else | |
6827 | return NULL; | |
6828 | } | |
6829 | ||
405f8e94 SS |
6830 | static int |
6831 | linux_get_min_fast_tracepoint_insn_len (void) | |
6832 | { | |
6833 | return (*the_low_target.get_min_fast_tracepoint_insn_len) (); | |
6834 | } | |
6835 | ||
2268b414 JK |
6836 | /* Extract &phdr and num_phdr in the inferior. Return 0 on success. */ |
6837 | ||
6838 | static int | |
6839 | get_phdr_phnum_from_proc_auxv (const int pid, const int is_elf64, | |
6840 | CORE_ADDR *phdr_memaddr, int *num_phdr) | |
6841 | { | |
6842 | char filename[PATH_MAX]; | |
6843 | int fd; | |
6844 | const int auxv_size = is_elf64 | |
6845 | ? sizeof (Elf64_auxv_t) : sizeof (Elf32_auxv_t); | |
6846 | char buf[sizeof (Elf64_auxv_t)]; /* The larger of the two. */ | |
6847 | ||
6848 | xsnprintf (filename, sizeof filename, "/proc/%d/auxv", pid); | |
6849 | ||
6850 | fd = open (filename, O_RDONLY); | |
6851 | if (fd < 0) | |
6852 | return 1; | |
6853 | ||
6854 | *phdr_memaddr = 0; | |
6855 | *num_phdr = 0; | |
6856 | while (read (fd, buf, auxv_size) == auxv_size | |
6857 | && (*phdr_memaddr == 0 || *num_phdr == 0)) | |
6858 | { | |
6859 | if (is_elf64) | |
6860 | { | |
6861 | Elf64_auxv_t *const aux = (Elf64_auxv_t *) buf; | |
6862 | ||
6863 | switch (aux->a_type) | |
6864 | { | |
6865 | case AT_PHDR: | |
6866 | *phdr_memaddr = aux->a_un.a_val; | |
6867 | break; | |
6868 | case AT_PHNUM: | |
6869 | *num_phdr = aux->a_un.a_val; | |
6870 | break; | |
6871 | } | |
6872 | } | |
6873 | else | |
6874 | { | |
6875 | Elf32_auxv_t *const aux = (Elf32_auxv_t *) buf; | |
6876 | ||
6877 | switch (aux->a_type) | |
6878 | { | |
6879 | case AT_PHDR: | |
6880 | *phdr_memaddr = aux->a_un.a_val; | |
6881 | break; | |
6882 | case AT_PHNUM: | |
6883 | *num_phdr = aux->a_un.a_val; | |
6884 | break; | |
6885 | } | |
6886 | } | |
6887 | } | |
6888 | ||
6889 | close (fd); | |
6890 | ||
6891 | if (*phdr_memaddr == 0 || *num_phdr == 0) | |
6892 | { | |
6893 | warning ("Unexpected missing AT_PHDR and/or AT_PHNUM: " | |
6894 | "phdr_memaddr = %ld, phdr_num = %d", | |
6895 | (long) *phdr_memaddr, *num_phdr); | |
6896 | return 2; | |
6897 | } | |
6898 | ||
6899 | return 0; | |
6900 | } | |
6901 | ||
6902 | /* Return &_DYNAMIC (via PT_DYNAMIC) in the inferior, or 0 if not present. */ | |
6903 | ||
6904 | static CORE_ADDR | |
6905 | get_dynamic (const int pid, const int is_elf64) | |
6906 | { | |
6907 | CORE_ADDR phdr_memaddr, relocation; | |
db1ff28b | 6908 | int num_phdr, i; |
2268b414 | 6909 | unsigned char *phdr_buf; |
db1ff28b | 6910 | const int phdr_size = is_elf64 ? sizeof (Elf64_Phdr) : sizeof (Elf32_Phdr); |
2268b414 JK |
6911 | |
6912 | if (get_phdr_phnum_from_proc_auxv (pid, is_elf64, &phdr_memaddr, &num_phdr)) | |
6913 | return 0; | |
6914 | ||
6915 | gdb_assert (num_phdr < 100); /* Basic sanity check. */ | |
224c3ddb | 6916 | phdr_buf = (unsigned char *) alloca (num_phdr * phdr_size); |
2268b414 JK |
6917 | |
6918 | if (linux_read_memory (phdr_memaddr, phdr_buf, num_phdr * phdr_size)) | |
6919 | return 0; | |
6920 | ||
6921 | /* Compute relocation: it is expected to be 0 for "regular" executables, | |
6922 | non-zero for PIE ones. */ | |
6923 | relocation = -1; | |
db1ff28b JK |
6924 | for (i = 0; relocation == -1 && i < num_phdr; i++) |
6925 | if (is_elf64) | |
6926 | { | |
6927 | Elf64_Phdr *const p = (Elf64_Phdr *) (phdr_buf + i * phdr_size); | |
6928 | ||
6929 | if (p->p_type == PT_PHDR) | |
6930 | relocation = phdr_memaddr - p->p_vaddr; | |
6931 | } | |
6932 | else | |
6933 | { | |
6934 | Elf32_Phdr *const p = (Elf32_Phdr *) (phdr_buf + i * phdr_size); | |
6935 | ||
6936 | if (p->p_type == PT_PHDR) | |
6937 | relocation = phdr_memaddr - p->p_vaddr; | |
6938 | } | |
6939 | ||
2268b414 JK |
6940 | if (relocation == -1) |
6941 | { | |
e237a7e2 JK |
6942 | /* PT_PHDR is optional, but necessary for PIE in general. Fortunately |
6943 | any real world executables, including PIE executables, have always | |
6944 | PT_PHDR present. PT_PHDR is not present in some shared libraries or | |
6945 | in fpc (Free Pascal 2.4) binaries but neither of those have a need for | |
6946 | or present DT_DEBUG anyway (fpc binaries are statically linked). | |
6947 | ||
6948 | Therefore if there exists DT_DEBUG there is always also PT_PHDR. | |
6949 | ||
6950 | GDB could find RELOCATION also from AT_ENTRY - e_entry. */ | |
6951 | ||
2268b414 JK |
6952 | return 0; |
6953 | } | |
6954 | ||
db1ff28b JK |
6955 | for (i = 0; i < num_phdr; i++) |
6956 | { | |
6957 | if (is_elf64) | |
6958 | { | |
6959 | Elf64_Phdr *const p = (Elf64_Phdr *) (phdr_buf + i * phdr_size); | |
6960 | ||
6961 | if (p->p_type == PT_DYNAMIC) | |
6962 | return p->p_vaddr + relocation; | |
6963 | } | |
6964 | else | |
6965 | { | |
6966 | Elf32_Phdr *const p = (Elf32_Phdr *) (phdr_buf + i * phdr_size); | |
2268b414 | 6967 | |
db1ff28b JK |
6968 | if (p->p_type == PT_DYNAMIC) |
6969 | return p->p_vaddr + relocation; | |
6970 | } | |
6971 | } | |
2268b414 JK |
6972 | |
6973 | return 0; | |
6974 | } | |
6975 | ||
6976 | /* Return &_r_debug in the inferior, or -1 if not present. Return value | |
367ba2c2 MR |
6977 | can be 0 if the inferior does not yet have the library list initialized. |
6978 | We look for DT_MIPS_RLD_MAP first. MIPS executables use this instead of | |
6979 | DT_DEBUG, although they sometimes contain an unused DT_DEBUG entry too. */ | |
2268b414 JK |
6980 | |
6981 | static CORE_ADDR | |
6982 | get_r_debug (const int pid, const int is_elf64) | |
6983 | { | |
6984 | CORE_ADDR dynamic_memaddr; | |
6985 | const int dyn_size = is_elf64 ? sizeof (Elf64_Dyn) : sizeof (Elf32_Dyn); | |
6986 | unsigned char buf[sizeof (Elf64_Dyn)]; /* The larger of the two. */ | |
367ba2c2 | 6987 | CORE_ADDR map = -1; |
2268b414 JK |
6988 | |
6989 | dynamic_memaddr = get_dynamic (pid, is_elf64); | |
6990 | if (dynamic_memaddr == 0) | |
367ba2c2 | 6991 | return map; |
2268b414 JK |
6992 | |
6993 | while (linux_read_memory (dynamic_memaddr, buf, dyn_size) == 0) | |
6994 | { | |
6995 | if (is_elf64) | |
6996 | { | |
6997 | Elf64_Dyn *const dyn = (Elf64_Dyn *) buf; | |
a738da3a | 6998 | #if defined DT_MIPS_RLD_MAP || defined DT_MIPS_RLD_MAP_REL |
367ba2c2 MR |
6999 | union |
7000 | { | |
7001 | Elf64_Xword map; | |
7002 | unsigned char buf[sizeof (Elf64_Xword)]; | |
7003 | } | |
7004 | rld_map; | |
a738da3a MF |
7005 | #endif |
7006 | #ifdef DT_MIPS_RLD_MAP | |
367ba2c2 MR |
7007 | if (dyn->d_tag == DT_MIPS_RLD_MAP) |
7008 | { | |
7009 | if (linux_read_memory (dyn->d_un.d_val, | |
7010 | rld_map.buf, sizeof (rld_map.buf)) == 0) | |
7011 | return rld_map.map; | |
7012 | else | |
7013 | break; | |
7014 | } | |
75f62ce7 | 7015 | #endif /* DT_MIPS_RLD_MAP */ |
a738da3a MF |
7016 | #ifdef DT_MIPS_RLD_MAP_REL |
7017 | if (dyn->d_tag == DT_MIPS_RLD_MAP_REL) | |
7018 | { | |
7019 | if (linux_read_memory (dyn->d_un.d_val + dynamic_memaddr, | |
7020 | rld_map.buf, sizeof (rld_map.buf)) == 0) | |
7021 | return rld_map.map; | |
7022 | else | |
7023 | break; | |
7024 | } | |
7025 | #endif /* DT_MIPS_RLD_MAP_REL */ | |
2268b414 | 7026 | |
367ba2c2 MR |
7027 | if (dyn->d_tag == DT_DEBUG && map == -1) |
7028 | map = dyn->d_un.d_val; | |
2268b414 JK |
7029 | |
7030 | if (dyn->d_tag == DT_NULL) | |
7031 | break; | |
7032 | } | |
7033 | else | |
7034 | { | |
7035 | Elf32_Dyn *const dyn = (Elf32_Dyn *) buf; | |
a738da3a | 7036 | #if defined DT_MIPS_RLD_MAP || defined DT_MIPS_RLD_MAP_REL |
367ba2c2 MR |
7037 | union |
7038 | { | |
7039 | Elf32_Word map; | |
7040 | unsigned char buf[sizeof (Elf32_Word)]; | |
7041 | } | |
7042 | rld_map; | |
a738da3a MF |
7043 | #endif |
7044 | #ifdef DT_MIPS_RLD_MAP | |
367ba2c2 MR |
7045 | if (dyn->d_tag == DT_MIPS_RLD_MAP) |
7046 | { | |
7047 | if (linux_read_memory (dyn->d_un.d_val, | |
7048 | rld_map.buf, sizeof (rld_map.buf)) == 0) | |
7049 | return rld_map.map; | |
7050 | else | |
7051 | break; | |
7052 | } | |
75f62ce7 | 7053 | #endif /* DT_MIPS_RLD_MAP */ |
a738da3a MF |
7054 | #ifdef DT_MIPS_RLD_MAP_REL |
7055 | if (dyn->d_tag == DT_MIPS_RLD_MAP_REL) | |
7056 | { | |
7057 | if (linux_read_memory (dyn->d_un.d_val + dynamic_memaddr, | |
7058 | rld_map.buf, sizeof (rld_map.buf)) == 0) | |
7059 | return rld_map.map; | |
7060 | else | |
7061 | break; | |
7062 | } | |
7063 | #endif /* DT_MIPS_RLD_MAP_REL */ | |
2268b414 | 7064 | |
367ba2c2 MR |
7065 | if (dyn->d_tag == DT_DEBUG && map == -1) |
7066 | map = dyn->d_un.d_val; | |
2268b414 JK |
7067 | |
7068 | if (dyn->d_tag == DT_NULL) | |
7069 | break; | |
7070 | } | |
7071 | ||
7072 | dynamic_memaddr += dyn_size; | |
7073 | } | |
7074 | ||
367ba2c2 | 7075 | return map; |
2268b414 JK |
7076 | } |
7077 | ||
7078 | /* Read one pointer from MEMADDR in the inferior. */ | |
7079 | ||
7080 | static int | |
7081 | read_one_ptr (CORE_ADDR memaddr, CORE_ADDR *ptr, int ptr_size) | |
7082 | { | |
485f1ee4 PA |
7083 | int ret; |
7084 | ||
7085 | /* Go through a union so this works on either big or little endian | |
7086 | hosts, when the inferior's pointer size is smaller than the size | |
7087 | of CORE_ADDR. It is assumed the inferior's endianness is the | |
7088 | same of the superior's. */ | |
7089 | union | |
7090 | { | |
7091 | CORE_ADDR core_addr; | |
7092 | unsigned int ui; | |
7093 | unsigned char uc; | |
7094 | } addr; | |
7095 | ||
7096 | ret = linux_read_memory (memaddr, &addr.uc, ptr_size); | |
7097 | if (ret == 0) | |
7098 | { | |
7099 | if (ptr_size == sizeof (CORE_ADDR)) | |
7100 | *ptr = addr.core_addr; | |
7101 | else if (ptr_size == sizeof (unsigned int)) | |
7102 | *ptr = addr.ui; | |
7103 | else | |
7104 | gdb_assert_not_reached ("unhandled pointer size"); | |
7105 | } | |
7106 | return ret; | |
2268b414 JK |
7107 | } |
7108 | ||
7109 | struct link_map_offsets | |
7110 | { | |
7111 | /* Offset and size of r_debug.r_version. */ | |
7112 | int r_version_offset; | |
7113 | ||
7114 | /* Offset and size of r_debug.r_map. */ | |
7115 | int r_map_offset; | |
7116 | ||
7117 | /* Offset to l_addr field in struct link_map. */ | |
7118 | int l_addr_offset; | |
7119 | ||
7120 | /* Offset to l_name field in struct link_map. */ | |
7121 | int l_name_offset; | |
7122 | ||
7123 | /* Offset to l_ld field in struct link_map. */ | |
7124 | int l_ld_offset; | |
7125 | ||
7126 | /* Offset to l_next field in struct link_map. */ | |
7127 | int l_next_offset; | |
7128 | ||
7129 | /* Offset to l_prev field in struct link_map. */ | |
7130 | int l_prev_offset; | |
7131 | }; | |
7132 | ||
fb723180 | 7133 | /* Construct qXfer:libraries-svr4:read reply. */ |
2268b414 JK |
7134 | |
7135 | static int | |
7136 | linux_qxfer_libraries_svr4 (const char *annex, unsigned char *readbuf, | |
7137 | unsigned const char *writebuf, | |
7138 | CORE_ADDR offset, int len) | |
7139 | { | |
7140 | char *document; | |
7141 | unsigned document_len; | |
fe978cb0 | 7142 | struct process_info_private *const priv = current_process ()->priv; |
2268b414 JK |
7143 | char filename[PATH_MAX]; |
7144 | int pid, is_elf64; | |
7145 | ||
7146 | static const struct link_map_offsets lmo_32bit_offsets = | |
7147 | { | |
7148 | 0, /* r_version offset. */ | |
7149 | 4, /* r_debug.r_map offset. */ | |
7150 | 0, /* l_addr offset in link_map. */ | |
7151 | 4, /* l_name offset in link_map. */ | |
7152 | 8, /* l_ld offset in link_map. */ | |
7153 | 12, /* l_next offset in link_map. */ | |
7154 | 16 /* l_prev offset in link_map. */ | |
7155 | }; | |
7156 | ||
7157 | static const struct link_map_offsets lmo_64bit_offsets = | |
7158 | { | |
7159 | 0, /* r_version offset. */ | |
7160 | 8, /* r_debug.r_map offset. */ | |
7161 | 0, /* l_addr offset in link_map. */ | |
7162 | 8, /* l_name offset in link_map. */ | |
7163 | 16, /* l_ld offset in link_map. */ | |
7164 | 24, /* l_next offset in link_map. */ | |
7165 | 32 /* l_prev offset in link_map. */ | |
7166 | }; | |
7167 | const struct link_map_offsets *lmo; | |
214d508e | 7168 | unsigned int machine; |
b1fbec62 GB |
7169 | int ptr_size; |
7170 | CORE_ADDR lm_addr = 0, lm_prev = 0; | |
7171 | int allocated = 1024; | |
7172 | char *p; | |
7173 | CORE_ADDR l_name, l_addr, l_ld, l_next, l_prev; | |
7174 | int header_done = 0; | |
2268b414 JK |
7175 | |
7176 | if (writebuf != NULL) | |
7177 | return -2; | |
7178 | if (readbuf == NULL) | |
7179 | return -1; | |
7180 | ||
0bfdf32f | 7181 | pid = lwpid_of (current_thread); |
2268b414 | 7182 | xsnprintf (filename, sizeof filename, "/proc/%d/exe", pid); |
214d508e | 7183 | is_elf64 = elf_64_file_p (filename, &machine); |
2268b414 | 7184 | lmo = is_elf64 ? &lmo_64bit_offsets : &lmo_32bit_offsets; |
b1fbec62 | 7185 | ptr_size = is_elf64 ? 8 : 4; |
2268b414 | 7186 | |
b1fbec62 GB |
7187 | while (annex[0] != '\0') |
7188 | { | |
7189 | const char *sep; | |
7190 | CORE_ADDR *addrp; | |
7191 | int len; | |
2268b414 | 7192 | |
b1fbec62 GB |
7193 | sep = strchr (annex, '='); |
7194 | if (sep == NULL) | |
7195 | break; | |
0c5bf5a9 | 7196 | |
b1fbec62 | 7197 | len = sep - annex; |
61012eef | 7198 | if (len == 5 && startswith (annex, "start")) |
b1fbec62 | 7199 | addrp = &lm_addr; |
61012eef | 7200 | else if (len == 4 && startswith (annex, "prev")) |
b1fbec62 GB |
7201 | addrp = &lm_prev; |
7202 | else | |
7203 | { | |
7204 | annex = strchr (sep, ';'); | |
7205 | if (annex == NULL) | |
7206 | break; | |
7207 | annex++; | |
7208 | continue; | |
7209 | } | |
7210 | ||
7211 | annex = decode_address_to_semicolon (addrp, sep + 1); | |
2268b414 | 7212 | } |
b1fbec62 GB |
7213 | |
7214 | if (lm_addr == 0) | |
2268b414 | 7215 | { |
b1fbec62 GB |
7216 | int r_version = 0; |
7217 | ||
7218 | if (priv->r_debug == 0) | |
7219 | priv->r_debug = get_r_debug (pid, is_elf64); | |
7220 | ||
7221 | /* We failed to find DT_DEBUG. Such situation will not change | |
7222 | for this inferior - do not retry it. Report it to GDB as | |
7223 | E01, see for the reasons at the GDB solib-svr4.c side. */ | |
7224 | if (priv->r_debug == (CORE_ADDR) -1) | |
7225 | return -1; | |
7226 | ||
7227 | if (priv->r_debug != 0) | |
2268b414 | 7228 | { |
b1fbec62 GB |
7229 | if (linux_read_memory (priv->r_debug + lmo->r_version_offset, |
7230 | (unsigned char *) &r_version, | |
7231 | sizeof (r_version)) != 0 | |
7232 | || r_version != 1) | |
7233 | { | |
7234 | warning ("unexpected r_debug version %d", r_version); | |
7235 | } | |
7236 | else if (read_one_ptr (priv->r_debug + lmo->r_map_offset, | |
7237 | &lm_addr, ptr_size) != 0) | |
7238 | { | |
7239 | warning ("unable to read r_map from 0x%lx", | |
7240 | (long) priv->r_debug + lmo->r_map_offset); | |
7241 | } | |
2268b414 | 7242 | } |
b1fbec62 | 7243 | } |
2268b414 | 7244 | |
224c3ddb | 7245 | document = (char *) xmalloc (allocated); |
b1fbec62 GB |
7246 | strcpy (document, "<library-list-svr4 version=\"1.0\""); |
7247 | p = document + strlen (document); | |
7248 | ||
7249 | while (lm_addr | |
7250 | && read_one_ptr (lm_addr + lmo->l_name_offset, | |
7251 | &l_name, ptr_size) == 0 | |
7252 | && read_one_ptr (lm_addr + lmo->l_addr_offset, | |
7253 | &l_addr, ptr_size) == 0 | |
7254 | && read_one_ptr (lm_addr + lmo->l_ld_offset, | |
7255 | &l_ld, ptr_size) == 0 | |
7256 | && read_one_ptr (lm_addr + lmo->l_prev_offset, | |
7257 | &l_prev, ptr_size) == 0 | |
7258 | && read_one_ptr (lm_addr + lmo->l_next_offset, | |
7259 | &l_next, ptr_size) == 0) | |
7260 | { | |
7261 | unsigned char libname[PATH_MAX]; | |
7262 | ||
7263 | if (lm_prev != l_prev) | |
2268b414 | 7264 | { |
b1fbec62 GB |
7265 | warning ("Corrupted shared library list: 0x%lx != 0x%lx", |
7266 | (long) lm_prev, (long) l_prev); | |
7267 | break; | |
2268b414 JK |
7268 | } |
7269 | ||
d878444c JK |
7270 | /* Ignore the first entry even if it has valid name as the first entry |
7271 | corresponds to the main executable. The first entry should not be | |
7272 | skipped if the dynamic loader was loaded late by a static executable | |
7273 | (see solib-svr4.c parameter ignore_first). But in such case the main | |
7274 | executable does not have PT_DYNAMIC present and this function already | |
7275 | exited above due to failed get_r_debug. */ | |
7276 | if (lm_prev == 0) | |
2268b414 | 7277 | { |
d878444c JK |
7278 | sprintf (p, " main-lm=\"0x%lx\"", (unsigned long) lm_addr); |
7279 | p = p + strlen (p); | |
7280 | } | |
7281 | else | |
7282 | { | |
7283 | /* Not checking for error because reading may stop before | |
7284 | we've got PATH_MAX worth of characters. */ | |
7285 | libname[0] = '\0'; | |
7286 | linux_read_memory (l_name, libname, sizeof (libname) - 1); | |
7287 | libname[sizeof (libname) - 1] = '\0'; | |
7288 | if (libname[0] != '\0') | |
2268b414 | 7289 | { |
d878444c JK |
7290 | /* 6x the size for xml_escape_text below. */ |
7291 | size_t len = 6 * strlen ((char *) libname); | |
7292 | char *name; | |
2268b414 | 7293 | |
d878444c JK |
7294 | if (!header_done) |
7295 | { | |
7296 | /* Terminate `<library-list-svr4'. */ | |
7297 | *p++ = '>'; | |
7298 | header_done = 1; | |
7299 | } | |
2268b414 | 7300 | |
db1ff28b | 7301 | while (allocated < p - document + len + 200) |
d878444c JK |
7302 | { |
7303 | /* Expand to guarantee sufficient storage. */ | |
7304 | uintptr_t document_len = p - document; | |
2268b414 | 7305 | |
224c3ddb | 7306 | document = (char *) xrealloc (document, 2 * allocated); |
d878444c JK |
7307 | allocated *= 2; |
7308 | p = document + document_len; | |
7309 | } | |
7310 | ||
7311 | name = xml_escape_text ((char *) libname); | |
7312 | p += sprintf (p, "<library name=\"%s\" lm=\"0x%lx\" " | |
db1ff28b | 7313 | "l_addr=\"0x%lx\" l_ld=\"0x%lx\"/>", |
d878444c JK |
7314 | name, (unsigned long) lm_addr, |
7315 | (unsigned long) l_addr, (unsigned long) l_ld); | |
7316 | free (name); | |
7317 | } | |
0afae3cf | 7318 | } |
b1fbec62 GB |
7319 | |
7320 | lm_prev = lm_addr; | |
7321 | lm_addr = l_next; | |
2268b414 JK |
7322 | } |
7323 | ||
b1fbec62 GB |
7324 | if (!header_done) |
7325 | { | |
7326 | /* Empty list; terminate `<library-list-svr4'. */ | |
7327 | strcpy (p, "/>"); | |
7328 | } | |
7329 | else | |
7330 | strcpy (p, "</library-list-svr4>"); | |
7331 | ||
2268b414 JK |
7332 | document_len = strlen (document); |
7333 | if (offset < document_len) | |
7334 | document_len -= offset; | |
7335 | else | |
7336 | document_len = 0; | |
7337 | if (len > document_len) | |
7338 | len = document_len; | |
7339 | ||
7340 | memcpy (readbuf, document + offset, len); | |
7341 | xfree (document); | |
7342 | ||
7343 | return len; | |
7344 | } | |
7345 | ||
9accd112 MM |
7346 | #ifdef HAVE_LINUX_BTRACE |
7347 | ||
969c39fb | 7348 | /* See to_disable_btrace target method. */ |
9accd112 | 7349 | |
969c39fb MM |
7350 | static int |
7351 | linux_low_disable_btrace (struct btrace_target_info *tinfo) | |
7352 | { | |
7353 | enum btrace_error err; | |
7354 | ||
7355 | err = linux_disable_btrace (tinfo); | |
7356 | return (err == BTRACE_ERR_NONE ? 0 : -1); | |
7357 | } | |
7358 | ||
bc504a31 | 7359 | /* Encode an Intel Processor Trace configuration. */ |
b20a6524 MM |
7360 | |
7361 | static void | |
7362 | linux_low_encode_pt_config (struct buffer *buffer, | |
7363 | const struct btrace_data_pt_config *config) | |
7364 | { | |
7365 | buffer_grow_str (buffer, "<pt-config>\n"); | |
7366 | ||
7367 | switch (config->cpu.vendor) | |
7368 | { | |
7369 | case CV_INTEL: | |
7370 | buffer_xml_printf (buffer, "<cpu vendor=\"GenuineIntel\" family=\"%u\" " | |
7371 | "model=\"%u\" stepping=\"%u\"/>\n", | |
7372 | config->cpu.family, config->cpu.model, | |
7373 | config->cpu.stepping); | |
7374 | break; | |
7375 | ||
7376 | default: | |
7377 | break; | |
7378 | } | |
7379 | ||
7380 | buffer_grow_str (buffer, "</pt-config>\n"); | |
7381 | } | |
7382 | ||
7383 | /* Encode a raw buffer. */ | |
7384 | ||
7385 | static void | |
7386 | linux_low_encode_raw (struct buffer *buffer, const gdb_byte *data, | |
7387 | unsigned int size) | |
7388 | { | |
7389 | if (size == 0) | |
7390 | return; | |
7391 | ||
7392 | /* We use hex encoding - see common/rsp-low.h. */ | |
7393 | buffer_grow_str (buffer, "<raw>\n"); | |
7394 | ||
7395 | while (size-- > 0) | |
7396 | { | |
7397 | char elem[2]; | |
7398 | ||
7399 | elem[0] = tohex ((*data >> 4) & 0xf); | |
7400 | elem[1] = tohex (*data++ & 0xf); | |
7401 | ||
7402 | buffer_grow (buffer, elem, 2); | |
7403 | } | |
7404 | ||
7405 | buffer_grow_str (buffer, "</raw>\n"); | |
7406 | } | |
7407 | ||
969c39fb MM |
7408 | /* See to_read_btrace target method. */ |
7409 | ||
7410 | static int | |
9accd112 | 7411 | linux_low_read_btrace (struct btrace_target_info *tinfo, struct buffer *buffer, |
add67df8 | 7412 | enum btrace_read_type type) |
9accd112 | 7413 | { |
734b0e4b | 7414 | struct btrace_data btrace; |
9accd112 | 7415 | struct btrace_block *block; |
969c39fb | 7416 | enum btrace_error err; |
9accd112 MM |
7417 | int i; |
7418 | ||
734b0e4b MM |
7419 | btrace_data_init (&btrace); |
7420 | ||
969c39fb MM |
7421 | err = linux_read_btrace (&btrace, tinfo, type); |
7422 | if (err != BTRACE_ERR_NONE) | |
7423 | { | |
7424 | if (err == BTRACE_ERR_OVERFLOW) | |
7425 | buffer_grow_str0 (buffer, "E.Overflow."); | |
7426 | else | |
7427 | buffer_grow_str0 (buffer, "E.Generic Error."); | |
7428 | ||
b20a6524 | 7429 | goto err; |
969c39fb | 7430 | } |
9accd112 | 7431 | |
734b0e4b MM |
7432 | switch (btrace.format) |
7433 | { | |
7434 | case BTRACE_FORMAT_NONE: | |
7435 | buffer_grow_str0 (buffer, "E.No Trace."); | |
b20a6524 | 7436 | goto err; |
734b0e4b MM |
7437 | |
7438 | case BTRACE_FORMAT_BTS: | |
7439 | buffer_grow_str (buffer, "<!DOCTYPE btrace SYSTEM \"btrace.dtd\">\n"); | |
7440 | buffer_grow_str (buffer, "<btrace version=\"1.0\">\n"); | |
9accd112 | 7441 | |
734b0e4b MM |
7442 | for (i = 0; |
7443 | VEC_iterate (btrace_block_s, btrace.variant.bts.blocks, i, block); | |
7444 | i++) | |
7445 | buffer_xml_printf (buffer, "<block begin=\"0x%s\" end=\"0x%s\"/>\n", | |
7446 | paddress (block->begin), paddress (block->end)); | |
9accd112 | 7447 | |
734b0e4b MM |
7448 | buffer_grow_str0 (buffer, "</btrace>\n"); |
7449 | break; | |
7450 | ||
b20a6524 MM |
7451 | case BTRACE_FORMAT_PT: |
7452 | buffer_grow_str (buffer, "<!DOCTYPE btrace SYSTEM \"btrace.dtd\">\n"); | |
7453 | buffer_grow_str (buffer, "<btrace version=\"1.0\">\n"); | |
7454 | buffer_grow_str (buffer, "<pt>\n"); | |
7455 | ||
7456 | linux_low_encode_pt_config (buffer, &btrace.variant.pt.config); | |
9accd112 | 7457 | |
b20a6524 MM |
7458 | linux_low_encode_raw (buffer, btrace.variant.pt.data, |
7459 | btrace.variant.pt.size); | |
7460 | ||
7461 | buffer_grow_str (buffer, "</pt>\n"); | |
7462 | buffer_grow_str0 (buffer, "</btrace>\n"); | |
7463 | break; | |
7464 | ||
7465 | default: | |
7466 | buffer_grow_str0 (buffer, "E.Unsupported Trace Format."); | |
7467 | goto err; | |
734b0e4b | 7468 | } |
969c39fb | 7469 | |
734b0e4b | 7470 | btrace_data_fini (&btrace); |
969c39fb | 7471 | return 0; |
b20a6524 MM |
7472 | |
7473 | err: | |
7474 | btrace_data_fini (&btrace); | |
7475 | return -1; | |
9accd112 | 7476 | } |
f4abbc16 MM |
7477 | |
7478 | /* See to_btrace_conf target method. */ | |
7479 | ||
7480 | static int | |
7481 | linux_low_btrace_conf (const struct btrace_target_info *tinfo, | |
7482 | struct buffer *buffer) | |
7483 | { | |
7484 | const struct btrace_config *conf; | |
7485 | ||
7486 | buffer_grow_str (buffer, "<!DOCTYPE btrace-conf SYSTEM \"btrace-conf.dtd\">\n"); | |
7487 | buffer_grow_str (buffer, "<btrace-conf version=\"1.0\">\n"); | |
7488 | ||
7489 | conf = linux_btrace_conf (tinfo); | |
7490 | if (conf != NULL) | |
7491 | { | |
7492 | switch (conf->format) | |
7493 | { | |
7494 | case BTRACE_FORMAT_NONE: | |
7495 | break; | |
7496 | ||
7497 | case BTRACE_FORMAT_BTS: | |
d33501a5 MM |
7498 | buffer_xml_printf (buffer, "<bts"); |
7499 | buffer_xml_printf (buffer, " size=\"0x%x\"", conf->bts.size); | |
7500 | buffer_xml_printf (buffer, " />\n"); | |
f4abbc16 | 7501 | break; |
b20a6524 MM |
7502 | |
7503 | case BTRACE_FORMAT_PT: | |
7504 | buffer_xml_printf (buffer, "<pt"); | |
7505 | buffer_xml_printf (buffer, " size=\"0x%x\"", conf->pt.size); | |
7506 | buffer_xml_printf (buffer, "/>\n"); | |
7507 | break; | |
f4abbc16 MM |
7508 | } |
7509 | } | |
7510 | ||
7511 | buffer_grow_str0 (buffer, "</btrace-conf>\n"); | |
7512 | return 0; | |
7513 | } | |
9accd112 MM |
7514 | #endif /* HAVE_LINUX_BTRACE */ |
7515 | ||
7b669087 GB |
7516 | /* See nat/linux-nat.h. */ |
7517 | ||
7518 | ptid_t | |
7519 | current_lwp_ptid (void) | |
7520 | { | |
7521 | return ptid_of (current_thread); | |
7522 | } | |
7523 | ||
dd373349 AT |
7524 | /* Implementation of the target_ops method "breakpoint_kind_from_pc". */ |
7525 | ||
7526 | static int | |
7527 | linux_breakpoint_kind_from_pc (CORE_ADDR *pcptr) | |
7528 | { | |
7529 | if (the_low_target.breakpoint_kind_from_pc != NULL) | |
7530 | return (*the_low_target.breakpoint_kind_from_pc) (pcptr); | |
7531 | else | |
1652a986 | 7532 | return default_breakpoint_kind_from_pc (pcptr); |
dd373349 AT |
7533 | } |
7534 | ||
7535 | /* Implementation of the target_ops method "sw_breakpoint_from_kind". */ | |
7536 | ||
7537 | static const gdb_byte * | |
7538 | linux_sw_breakpoint_from_kind (int kind, int *size) | |
7539 | { | |
7540 | gdb_assert (the_low_target.sw_breakpoint_from_kind != NULL); | |
7541 | ||
7542 | return (*the_low_target.sw_breakpoint_from_kind) (kind, size); | |
7543 | } | |
7544 | ||
769ef81f AT |
7545 | /* Implementation of the target_ops method |
7546 | "breakpoint_kind_from_current_state". */ | |
7547 | ||
7548 | static int | |
7549 | linux_breakpoint_kind_from_current_state (CORE_ADDR *pcptr) | |
7550 | { | |
7551 | if (the_low_target.breakpoint_kind_from_current_state != NULL) | |
7552 | return (*the_low_target.breakpoint_kind_from_current_state) (pcptr); | |
7553 | else | |
7554 | return linux_breakpoint_kind_from_pc (pcptr); | |
7555 | } | |
7556 | ||
276d4552 YQ |
7557 | /* Default implementation of linux_target_ops method "set_pc" for |
7558 | 32-bit pc register which is literally named "pc". */ | |
7559 | ||
7560 | void | |
7561 | linux_set_pc_32bit (struct regcache *regcache, CORE_ADDR pc) | |
7562 | { | |
7563 | uint32_t newpc = pc; | |
7564 | ||
7565 | supply_register_by_name (regcache, "pc", &newpc); | |
7566 | } | |
7567 | ||
7568 | /* Default implementation of linux_target_ops method "get_pc" for | |
7569 | 32-bit pc register which is literally named "pc". */ | |
7570 | ||
7571 | CORE_ADDR | |
7572 | linux_get_pc_32bit (struct regcache *regcache) | |
7573 | { | |
7574 | uint32_t pc; | |
7575 | ||
7576 | collect_register_by_name (regcache, "pc", &pc); | |
7577 | if (debug_threads) | |
7578 | debug_printf ("stop pc is 0x%" PRIx32 "\n", pc); | |
7579 | return pc; | |
7580 | } | |
7581 | ||
6f69e520 YQ |
7582 | /* Default implementation of linux_target_ops method "set_pc" for |
7583 | 64-bit pc register which is literally named "pc". */ | |
7584 | ||
7585 | void | |
7586 | linux_set_pc_64bit (struct regcache *regcache, CORE_ADDR pc) | |
7587 | { | |
7588 | uint64_t newpc = pc; | |
7589 | ||
7590 | supply_register_by_name (regcache, "pc", &newpc); | |
7591 | } | |
7592 | ||
7593 | /* Default implementation of linux_target_ops method "get_pc" for | |
7594 | 64-bit pc register which is literally named "pc". */ | |
7595 | ||
7596 | CORE_ADDR | |
7597 | linux_get_pc_64bit (struct regcache *regcache) | |
7598 | { | |
7599 | uint64_t pc; | |
7600 | ||
7601 | collect_register_by_name (regcache, "pc", &pc); | |
7602 | if (debug_threads) | |
7603 | debug_printf ("stop pc is 0x%" PRIx64 "\n", pc); | |
7604 | return pc; | |
7605 | } | |
7606 | ||
7607 | ||
ce3a066d DJ |
7608 | static struct target_ops linux_target_ops = { |
7609 | linux_create_inferior, | |
ece66d65 | 7610 | linux_post_create_inferior, |
ce3a066d DJ |
7611 | linux_attach, |
7612 | linux_kill, | |
6ad8ae5c | 7613 | linux_detach, |
8336d594 | 7614 | linux_mourn, |
444d6139 | 7615 | linux_join, |
ce3a066d DJ |
7616 | linux_thread_alive, |
7617 | linux_resume, | |
7618 | linux_wait, | |
7619 | linux_fetch_registers, | |
7620 | linux_store_registers, | |
90d74c30 | 7621 | linux_prepare_to_access_memory, |
0146f85b | 7622 | linux_done_accessing_memory, |
ce3a066d DJ |
7623 | linux_read_memory, |
7624 | linux_write_memory, | |
2f2893d9 | 7625 | linux_look_up_symbols, |
ef57601b | 7626 | linux_request_interrupt, |
aa691b87 | 7627 | linux_read_auxv, |
802e8e6d | 7628 | linux_supports_z_point_type, |
d993e290 PA |
7629 | linux_insert_point, |
7630 | linux_remove_point, | |
3e572f71 PA |
7631 | linux_stopped_by_sw_breakpoint, |
7632 | linux_supports_stopped_by_sw_breakpoint, | |
7633 | linux_stopped_by_hw_breakpoint, | |
7634 | linux_supports_stopped_by_hw_breakpoint, | |
70b90b91 | 7635 | linux_supports_hardware_single_step, |
e013ee27 OF |
7636 | linux_stopped_by_watchpoint, |
7637 | linux_stopped_data_address, | |
db0dfaa0 LM |
7638 | #if defined(__UCLIBC__) && defined(HAS_NOMMU) \ |
7639 | && defined(PT_TEXT_ADDR) && defined(PT_DATA_ADDR) \ | |
7640 | && defined(PT_TEXT_END_ADDR) | |
52fb6437 | 7641 | linux_read_offsets, |
dae5f5cf DJ |
7642 | #else |
7643 | NULL, | |
7644 | #endif | |
7645 | #ifdef USE_THREAD_DB | |
7646 | thread_db_get_tls_address, | |
7647 | #else | |
7648 | NULL, | |
52fb6437 | 7649 | #endif |
efcbbd14 | 7650 | linux_qxfer_spu, |
59a016f0 | 7651 | hostio_last_error_from_errno, |
07e059b5 | 7652 | linux_qxfer_osdata, |
4aa995e1 | 7653 | linux_xfer_siginfo, |
bd99dc85 PA |
7654 | linux_supports_non_stop, |
7655 | linux_async, | |
7656 | linux_start_non_stop, | |
cdbfd419 | 7657 | linux_supports_multi_process, |
89245bc0 DB |
7658 | linux_supports_fork_events, |
7659 | linux_supports_vfork_events, | |
94585166 | 7660 | linux_supports_exec_events, |
de0d863e | 7661 | linux_handle_new_gdb_connection, |
cdbfd419 | 7662 | #ifdef USE_THREAD_DB |
dc146f7c | 7663 | thread_db_handle_monitor_command, |
cdbfd419 | 7664 | #else |
dc146f7c | 7665 | NULL, |
cdbfd419 | 7666 | #endif |
d26e3629 | 7667 | linux_common_core_of_thread, |
78d85199 | 7668 | linux_read_loadmap, |
219f2f23 PA |
7669 | linux_process_qsupported, |
7670 | linux_supports_tracepoints, | |
7671 | linux_read_pc, | |
8336d594 PA |
7672 | linux_write_pc, |
7673 | linux_thread_stopped, | |
7984d532 | 7674 | NULL, |
711e434b | 7675 | linux_pause_all, |
7984d532 | 7676 | linux_unpause_all, |
fa593d66 | 7677 | linux_stabilize_threads, |
6a271cae | 7678 | linux_install_fast_tracepoint_jump_pad, |
03583c20 UW |
7679 | linux_emit_ops, |
7680 | linux_supports_disable_randomization, | |
405f8e94 | 7681 | linux_get_min_fast_tracepoint_insn_len, |
2268b414 | 7682 | linux_qxfer_libraries_svr4, |
d1feda86 | 7683 | linux_supports_agent, |
9accd112 MM |
7684 | #ifdef HAVE_LINUX_BTRACE |
7685 | linux_supports_btrace, | |
0568462b | 7686 | linux_enable_btrace, |
969c39fb | 7687 | linux_low_disable_btrace, |
9accd112 | 7688 | linux_low_read_btrace, |
f4abbc16 | 7689 | linux_low_btrace_conf, |
9accd112 MM |
7690 | #else |
7691 | NULL, | |
7692 | NULL, | |
7693 | NULL, | |
7694 | NULL, | |
f4abbc16 | 7695 | NULL, |
9accd112 | 7696 | #endif |
c2d6af84 | 7697 | linux_supports_range_stepping, |
e57f1de3 | 7698 | linux_proc_pid_to_exec_file, |
14d2069a GB |
7699 | linux_mntns_open_cloexec, |
7700 | linux_mntns_unlink, | |
7701 | linux_mntns_readlink, | |
dd373349 | 7702 | linux_breakpoint_kind_from_pc, |
79efa585 SM |
7703 | linux_sw_breakpoint_from_kind, |
7704 | linux_proc_tid_get_name, | |
7d00775e | 7705 | linux_breakpoint_kind_from_current_state, |
82075af2 JS |
7706 | linux_supports_software_single_step, |
7707 | linux_supports_catch_syscall, | |
ae91f625 | 7708 | linux_get_ipa_tdesc_idx, |
ce3a066d DJ |
7709 | }; |
7710 | ||
3aee8918 PA |
7711 | #ifdef HAVE_LINUX_REGSETS |
7712 | void | |
7713 | initialize_regsets_info (struct regsets_info *info) | |
7714 | { | |
7715 | for (info->num_regsets = 0; | |
7716 | info->regsets[info->num_regsets].size >= 0; | |
7717 | info->num_regsets++) | |
7718 | ; | |
3aee8918 PA |
7719 | } |
7720 | #endif | |
7721 | ||
da6d8c04 DJ |
7722 | void |
7723 | initialize_low (void) | |
7724 | { | |
bd99dc85 | 7725 | struct sigaction sigchld_action; |
dd373349 | 7726 | |
bd99dc85 | 7727 | memset (&sigchld_action, 0, sizeof (sigchld_action)); |
ce3a066d | 7728 | set_target_ops (&linux_target_ops); |
dd373349 | 7729 | |
aa7c7447 | 7730 | linux_ptrace_init_warnings (); |
bd99dc85 PA |
7731 | |
7732 | sigchld_action.sa_handler = sigchld_handler; | |
7733 | sigemptyset (&sigchld_action.sa_mask); | |
7734 | sigchld_action.sa_flags = SA_RESTART; | |
7735 | sigaction (SIGCHLD, &sigchld_action, NULL); | |
3aee8918 PA |
7736 | |
7737 | initialize_low_arch (); | |
89245bc0 DB |
7738 | |
7739 | linux_check_ptrace_features (); | |
da6d8c04 | 7740 | } |