Commit | Line | Data |
---|---|---|
da6d8c04 | 1 | /* Low level interface to ptrace, for the remote server for GDB. |
618f726f | 2 | Copyright (C) 1995-2016 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> |
957f3f49 DE |
50 | #ifndef ELFMAG0 |
51 | /* Don't include <linux/elf.h> here. If it got included by gdb_proc_service.h | |
52 | then ELFMAG0 will have been defined. If it didn't get included by | |
53 | gdb_proc_service.h then including it will likely introduce a duplicate | |
54 | definition of elf_fpregset_t. */ | |
55 | #include <elf.h> | |
56 | #endif | |
14d2069a | 57 | #include "nat/linux-namespaces.h" |
efcbbd14 UW |
58 | |
59 | #ifndef SPUFS_MAGIC | |
60 | #define SPUFS_MAGIC 0x23c9b64e | |
61 | #endif | |
da6d8c04 | 62 | |
03583c20 UW |
63 | #ifdef HAVE_PERSONALITY |
64 | # include <sys/personality.h> | |
65 | # if !HAVE_DECL_ADDR_NO_RANDOMIZE | |
66 | # define ADDR_NO_RANDOMIZE 0x0040000 | |
67 | # endif | |
68 | #endif | |
69 | ||
fd462a61 DJ |
70 | #ifndef O_LARGEFILE |
71 | #define O_LARGEFILE 0 | |
72 | #endif | |
1a981360 | 73 | |
db0dfaa0 LM |
74 | /* Some targets did not define these ptrace constants from the start, |
75 | so gdbserver defines them locally here. In the future, these may | |
76 | be removed after they are added to asm/ptrace.h. */ | |
77 | #if !(defined(PT_TEXT_ADDR) \ | |
78 | || defined(PT_DATA_ADDR) \ | |
79 | || defined(PT_TEXT_END_ADDR)) | |
80 | #if defined(__mcoldfire__) | |
81 | /* These are still undefined in 3.10 kernels. */ | |
82 | #define PT_TEXT_ADDR 49*4 | |
83 | #define PT_DATA_ADDR 50*4 | |
84 | #define PT_TEXT_END_ADDR 51*4 | |
85 | /* BFIN already defines these since at least 2.6.32 kernels. */ | |
86 | #elif defined(BFIN) | |
87 | #define PT_TEXT_ADDR 220 | |
88 | #define PT_TEXT_END_ADDR 224 | |
89 | #define PT_DATA_ADDR 228 | |
90 | /* These are still undefined in 3.10 kernels. */ | |
91 | #elif defined(__TMS320C6X__) | |
92 | #define PT_TEXT_ADDR (0x10000*4) | |
93 | #define PT_DATA_ADDR (0x10004*4) | |
94 | #define PT_TEXT_END_ADDR (0x10008*4) | |
95 | #endif | |
96 | #endif | |
97 | ||
9accd112 | 98 | #ifdef HAVE_LINUX_BTRACE |
125f8a3d | 99 | # include "nat/linux-btrace.h" |
734b0e4b | 100 | # include "btrace-common.h" |
9accd112 MM |
101 | #endif |
102 | ||
8365dcf5 TJB |
103 | #ifndef HAVE_ELF32_AUXV_T |
104 | /* Copied from glibc's elf.h. */ | |
105 | typedef struct | |
106 | { | |
107 | uint32_t a_type; /* Entry type */ | |
108 | union | |
109 | { | |
110 | uint32_t a_val; /* Integer value */ | |
111 | /* We use to have pointer elements added here. We cannot do that, | |
112 | though, since it does not work when using 32-bit definitions | |
113 | on 64-bit platforms and vice versa. */ | |
114 | } a_un; | |
115 | } Elf32_auxv_t; | |
116 | #endif | |
117 | ||
118 | #ifndef HAVE_ELF64_AUXV_T | |
119 | /* Copied from glibc's elf.h. */ | |
120 | typedef struct | |
121 | { | |
122 | uint64_t a_type; /* Entry type */ | |
123 | union | |
124 | { | |
125 | uint64_t a_val; /* Integer value */ | |
126 | /* We use to have pointer elements added here. We cannot do that, | |
127 | though, since it does not work when using 32-bit definitions | |
128 | on 64-bit platforms and vice versa. */ | |
129 | } a_un; | |
130 | } Elf64_auxv_t; | |
131 | #endif | |
132 | ||
ded48a5e YQ |
133 | /* Does the current host support PTRACE_GETREGSET? */ |
134 | int have_ptrace_getregset = -1; | |
135 | ||
cff068da GB |
136 | /* LWP accessors. */ |
137 | ||
138 | /* See nat/linux-nat.h. */ | |
139 | ||
140 | ptid_t | |
141 | ptid_of_lwp (struct lwp_info *lwp) | |
142 | { | |
143 | return ptid_of (get_lwp_thread (lwp)); | |
144 | } | |
145 | ||
146 | /* See nat/linux-nat.h. */ | |
147 | ||
4b134ca1 GB |
148 | void |
149 | lwp_set_arch_private_info (struct lwp_info *lwp, | |
150 | struct arch_lwp_info *info) | |
151 | { | |
152 | lwp->arch_private = info; | |
153 | } | |
154 | ||
155 | /* See nat/linux-nat.h. */ | |
156 | ||
157 | struct arch_lwp_info * | |
158 | lwp_arch_private_info (struct lwp_info *lwp) | |
159 | { | |
160 | return lwp->arch_private; | |
161 | } | |
162 | ||
163 | /* See nat/linux-nat.h. */ | |
164 | ||
cff068da GB |
165 | int |
166 | lwp_is_stopped (struct lwp_info *lwp) | |
167 | { | |
168 | return lwp->stopped; | |
169 | } | |
170 | ||
171 | /* See nat/linux-nat.h. */ | |
172 | ||
173 | enum target_stop_reason | |
174 | lwp_stop_reason (struct lwp_info *lwp) | |
175 | { | |
176 | return lwp->stop_reason; | |
177 | } | |
178 | ||
0e00e962 AA |
179 | /* See nat/linux-nat.h. */ |
180 | ||
181 | int | |
182 | lwp_is_stepping (struct lwp_info *lwp) | |
183 | { | |
184 | return lwp->stepping; | |
185 | } | |
186 | ||
05044653 PA |
187 | /* A list of all unknown processes which receive stop signals. Some |
188 | other process will presumably claim each of these as forked | |
189 | children momentarily. */ | |
24a09b5f | 190 | |
05044653 PA |
191 | struct simple_pid_list |
192 | { | |
193 | /* The process ID. */ | |
194 | int pid; | |
195 | ||
196 | /* The status as reported by waitpid. */ | |
197 | int status; | |
198 | ||
199 | /* Next in chain. */ | |
200 | struct simple_pid_list *next; | |
201 | }; | |
202 | struct simple_pid_list *stopped_pids; | |
203 | ||
204 | /* Trivial list manipulation functions to keep track of a list of new | |
205 | stopped processes. */ | |
206 | ||
207 | static void | |
208 | add_to_pid_list (struct simple_pid_list **listp, int pid, int status) | |
209 | { | |
8d749320 | 210 | struct simple_pid_list *new_pid = XNEW (struct simple_pid_list); |
05044653 PA |
211 | |
212 | new_pid->pid = pid; | |
213 | new_pid->status = status; | |
214 | new_pid->next = *listp; | |
215 | *listp = new_pid; | |
216 | } | |
217 | ||
218 | static int | |
219 | pull_pid_from_list (struct simple_pid_list **listp, int pid, int *statusp) | |
220 | { | |
221 | struct simple_pid_list **p; | |
222 | ||
223 | for (p = listp; *p != NULL; p = &(*p)->next) | |
224 | if ((*p)->pid == pid) | |
225 | { | |
226 | struct simple_pid_list *next = (*p)->next; | |
227 | ||
228 | *statusp = (*p)->status; | |
229 | xfree (*p); | |
230 | *p = next; | |
231 | return 1; | |
232 | } | |
233 | return 0; | |
234 | } | |
24a09b5f | 235 | |
bde24c0a PA |
236 | enum stopping_threads_kind |
237 | { | |
238 | /* Not stopping threads presently. */ | |
239 | NOT_STOPPING_THREADS, | |
240 | ||
241 | /* Stopping threads. */ | |
242 | STOPPING_THREADS, | |
243 | ||
244 | /* Stopping and suspending threads. */ | |
245 | STOPPING_AND_SUSPENDING_THREADS | |
246 | }; | |
247 | ||
248 | /* This is set while stop_all_lwps is in effect. */ | |
249 | enum stopping_threads_kind stopping_threads = NOT_STOPPING_THREADS; | |
0d62e5e8 DJ |
250 | |
251 | /* FIXME make into a target method? */ | |
24a09b5f | 252 | int using_threads = 1; |
24a09b5f | 253 | |
fa593d66 PA |
254 | /* True if we're presently stabilizing threads (moving them out of |
255 | jump pads). */ | |
256 | static int stabilizing_threads; | |
257 | ||
2acc282a | 258 | static void linux_resume_one_lwp (struct lwp_info *lwp, |
54a0b537 | 259 | int step, int signal, siginfo_t *info); |
2bd7c093 | 260 | static void linux_resume (struct thread_resume *resume_info, size_t n); |
7984d532 PA |
261 | static void stop_all_lwps (int suspend, struct lwp_info *except); |
262 | static void unstop_all_lwps (int unsuspend, struct lwp_info *except); | |
f50bf8e5 | 263 | static void unsuspend_all_lwps (struct lwp_info *except); |
fa96cb38 PA |
264 | static int linux_wait_for_event_filtered (ptid_t wait_ptid, ptid_t filter_ptid, |
265 | int *wstat, int options); | |
95954743 | 266 | static int linux_wait_for_event (ptid_t ptid, int *wstat, int options); |
b3312d80 | 267 | static struct lwp_info *add_lwp (ptid_t ptid); |
94585166 | 268 | static void linux_mourn (struct process_info *process); |
c35fafde | 269 | static int linux_stopped_by_watchpoint (void); |
95954743 | 270 | static void mark_lwp_dead (struct lwp_info *lwp, int wstat); |
00db26fa | 271 | static int lwp_is_marked_dead (struct lwp_info *lwp); |
d50171e4 | 272 | static void proceed_all_lwps (void); |
d50171e4 | 273 | static int finish_step_over (struct lwp_info *lwp); |
d50171e4 | 274 | static int kill_lwp (unsigned long lwpid, int signo); |
863d01bd PA |
275 | static void enqueue_pending_signal (struct lwp_info *lwp, int signal, siginfo_t *info); |
276 | static void complete_ongoing_step_over (void); | |
ece66d65 | 277 | static int linux_low_ptrace_options (int attached); |
ced2dffb | 278 | static int check_ptrace_stopped_lwp_gone (struct lwp_info *lp); |
0e9a339e | 279 | static int proceed_one_lwp (struct inferior_list_entry *entry, void *except); |
d50171e4 | 280 | |
582511be PA |
281 | /* When the event-loop is doing a step-over, this points at the thread |
282 | being stepped. */ | |
283 | ptid_t step_over_bkpt; | |
284 | ||
7d00775e | 285 | /* True if the low target can hardware single-step. */ |
d50171e4 PA |
286 | |
287 | static int | |
288 | can_hardware_single_step (void) | |
289 | { | |
7d00775e AT |
290 | if (the_low_target.supports_hardware_single_step != NULL) |
291 | return the_low_target.supports_hardware_single_step (); | |
292 | else | |
293 | return 0; | |
294 | } | |
295 | ||
296 | /* True if the low target can software single-step. Such targets | |
fa5308bd | 297 | implement the GET_NEXT_PCS callback. */ |
7d00775e AT |
298 | |
299 | static int | |
300 | can_software_single_step (void) | |
301 | { | |
fa5308bd | 302 | return (the_low_target.get_next_pcs != NULL); |
d50171e4 PA |
303 | } |
304 | ||
305 | /* True if the low target supports memory breakpoints. If so, we'll | |
306 | have a GET_PC implementation. */ | |
307 | ||
308 | static int | |
309 | supports_breakpoints (void) | |
310 | { | |
311 | return (the_low_target.get_pc != NULL); | |
312 | } | |
0d62e5e8 | 313 | |
fa593d66 PA |
314 | /* Returns true if this target can support fast tracepoints. This |
315 | does not mean that the in-process agent has been loaded in the | |
316 | inferior. */ | |
317 | ||
318 | static int | |
319 | supports_fast_tracepoints (void) | |
320 | { | |
321 | return the_low_target.install_fast_tracepoint_jump_pad != NULL; | |
322 | } | |
323 | ||
c2d6af84 PA |
324 | /* True if LWP is stopped in its stepping range. */ |
325 | ||
326 | static int | |
327 | lwp_in_step_range (struct lwp_info *lwp) | |
328 | { | |
329 | CORE_ADDR pc = lwp->stop_pc; | |
330 | ||
331 | return (pc >= lwp->step_range_start && pc < lwp->step_range_end); | |
332 | } | |
333 | ||
0d62e5e8 DJ |
334 | struct pending_signals |
335 | { | |
336 | int signal; | |
32ca6d61 | 337 | siginfo_t info; |
0d62e5e8 DJ |
338 | struct pending_signals *prev; |
339 | }; | |
611cb4a5 | 340 | |
bd99dc85 PA |
341 | /* The read/write ends of the pipe registered as waitable file in the |
342 | event loop. */ | |
343 | static int linux_event_pipe[2] = { -1, -1 }; | |
344 | ||
345 | /* True if we're currently in async mode. */ | |
346 | #define target_is_async_p() (linux_event_pipe[0] != -1) | |
347 | ||
02fc4de7 | 348 | static void send_sigstop (struct lwp_info *lwp); |
fa96cb38 | 349 | static void wait_for_sigstop (void); |
bd99dc85 | 350 | |
d0722149 DE |
351 | /* Return non-zero if HEADER is a 64-bit ELF file. */ |
352 | ||
353 | static int | |
214d508e | 354 | elf_64_header_p (const Elf64_Ehdr *header, unsigned int *machine) |
d0722149 | 355 | { |
214d508e L |
356 | if (header->e_ident[EI_MAG0] == ELFMAG0 |
357 | && header->e_ident[EI_MAG1] == ELFMAG1 | |
358 | && header->e_ident[EI_MAG2] == ELFMAG2 | |
359 | && header->e_ident[EI_MAG3] == ELFMAG3) | |
360 | { | |
361 | *machine = header->e_machine; | |
362 | return header->e_ident[EI_CLASS] == ELFCLASS64; | |
363 | ||
364 | } | |
365 | *machine = EM_NONE; | |
366 | return -1; | |
d0722149 DE |
367 | } |
368 | ||
369 | /* Return non-zero if FILE is a 64-bit ELF file, | |
370 | zero if the file is not a 64-bit ELF file, | |
371 | and -1 if the file is not accessible or doesn't exist. */ | |
372 | ||
be07f1a2 | 373 | static int |
214d508e | 374 | elf_64_file_p (const char *file, unsigned int *machine) |
d0722149 | 375 | { |
957f3f49 | 376 | Elf64_Ehdr header; |
d0722149 DE |
377 | int fd; |
378 | ||
379 | fd = open (file, O_RDONLY); | |
380 | if (fd < 0) | |
381 | return -1; | |
382 | ||
383 | if (read (fd, &header, sizeof (header)) != sizeof (header)) | |
384 | { | |
385 | close (fd); | |
386 | return 0; | |
387 | } | |
388 | close (fd); | |
389 | ||
214d508e | 390 | return elf_64_header_p (&header, machine); |
d0722149 DE |
391 | } |
392 | ||
be07f1a2 PA |
393 | /* Accepts an integer PID; Returns true if the executable PID is |
394 | running is a 64-bit ELF file.. */ | |
395 | ||
396 | int | |
214d508e | 397 | linux_pid_exe_is_elf_64_file (int pid, unsigned int *machine) |
be07f1a2 | 398 | { |
d8d2a3ee | 399 | char file[PATH_MAX]; |
be07f1a2 PA |
400 | |
401 | sprintf (file, "/proc/%d/exe", pid); | |
214d508e | 402 | return elf_64_file_p (file, machine); |
be07f1a2 PA |
403 | } |
404 | ||
bd99dc85 PA |
405 | static void |
406 | delete_lwp (struct lwp_info *lwp) | |
407 | { | |
fa96cb38 PA |
408 | struct thread_info *thr = get_lwp_thread (lwp); |
409 | ||
410 | if (debug_threads) | |
411 | debug_printf ("deleting %ld\n", lwpid_of (thr)); | |
412 | ||
413 | remove_thread (thr); | |
aa5ca48f | 414 | free (lwp->arch_private); |
bd99dc85 PA |
415 | free (lwp); |
416 | } | |
417 | ||
95954743 PA |
418 | /* Add a process to the common process list, and set its private |
419 | data. */ | |
420 | ||
421 | static struct process_info * | |
422 | linux_add_process (int pid, int attached) | |
423 | { | |
424 | struct process_info *proc; | |
425 | ||
95954743 | 426 | proc = add_process (pid, attached); |
8d749320 | 427 | proc->priv = XCNEW (struct process_info_private); |
95954743 | 428 | |
aa5ca48f | 429 | if (the_low_target.new_process != NULL) |
fe978cb0 | 430 | proc->priv->arch_private = the_low_target.new_process (); |
aa5ca48f | 431 | |
95954743 PA |
432 | return proc; |
433 | } | |
434 | ||
582511be PA |
435 | static CORE_ADDR get_pc (struct lwp_info *lwp); |
436 | ||
ece66d65 | 437 | /* Call the target arch_setup function on the current thread. */ |
94585166 DB |
438 | |
439 | static void | |
440 | linux_arch_setup (void) | |
441 | { | |
442 | the_low_target.arch_setup (); | |
443 | } | |
444 | ||
445 | /* Call the target arch_setup function on THREAD. */ | |
446 | ||
447 | static void | |
448 | linux_arch_setup_thread (struct thread_info *thread) | |
449 | { | |
450 | struct thread_info *saved_thread; | |
451 | ||
452 | saved_thread = current_thread; | |
453 | current_thread = thread; | |
454 | ||
455 | linux_arch_setup (); | |
456 | ||
457 | current_thread = saved_thread; | |
458 | } | |
459 | ||
460 | /* Handle a GNU/Linux extended wait response. If we see a clone, | |
461 | fork, or vfork event, we need to add the new LWP to our list | |
462 | (and return 0 so as not to report the trap to higher layers). | |
463 | If we see an exec event, we will modify ORIG_EVENT_LWP to point | |
464 | to a new LWP representing the new program. */ | |
0d62e5e8 | 465 | |
de0d863e | 466 | static int |
94585166 | 467 | handle_extended_wait (struct lwp_info **orig_event_lwp, int wstat) |
24a09b5f | 468 | { |
94585166 | 469 | struct lwp_info *event_lwp = *orig_event_lwp; |
89a5711c | 470 | int event = linux_ptrace_get_extended_event (wstat); |
de0d863e | 471 | struct thread_info *event_thr = get_lwp_thread (event_lwp); |
54a0b537 | 472 | struct lwp_info *new_lwp; |
24a09b5f | 473 | |
65706a29 PA |
474 | gdb_assert (event_lwp->waitstatus.kind == TARGET_WAITKIND_IGNORE); |
475 | ||
82075af2 JS |
476 | /* All extended events we currently use are mid-syscall. Only |
477 | PTRACE_EVENT_STOP is delivered more like a signal-stop, but | |
478 | you have to be using PTRACE_SEIZE to get that. */ | |
479 | event_lwp->syscall_state = TARGET_WAITKIND_SYSCALL_ENTRY; | |
480 | ||
c269dbdb DB |
481 | if ((event == PTRACE_EVENT_FORK) || (event == PTRACE_EVENT_VFORK) |
482 | || (event == PTRACE_EVENT_CLONE)) | |
24a09b5f | 483 | { |
95954743 | 484 | ptid_t ptid; |
24a09b5f | 485 | unsigned long new_pid; |
05044653 | 486 | int ret, status; |
24a09b5f | 487 | |
de0d863e | 488 | /* Get the pid of the new lwp. */ |
d86d4aaf | 489 | ptrace (PTRACE_GETEVENTMSG, lwpid_of (event_thr), (PTRACE_TYPE_ARG3) 0, |
56f7af9c | 490 | &new_pid); |
24a09b5f DJ |
491 | |
492 | /* If we haven't already seen the new PID stop, wait for it now. */ | |
05044653 | 493 | if (!pull_pid_from_list (&stopped_pids, new_pid, &status)) |
24a09b5f DJ |
494 | { |
495 | /* The new child has a pending SIGSTOP. We can't affect it until it | |
496 | hits the SIGSTOP, but we're already attached. */ | |
497 | ||
97438e3f | 498 | ret = my_waitpid (new_pid, &status, __WALL); |
24a09b5f DJ |
499 | |
500 | if (ret == -1) | |
501 | perror_with_name ("waiting for new child"); | |
502 | else if (ret != new_pid) | |
503 | warning ("wait returned unexpected PID %d", ret); | |
da5898ce | 504 | else if (!WIFSTOPPED (status)) |
24a09b5f DJ |
505 | warning ("wait returned unexpected status 0x%x", status); |
506 | } | |
507 | ||
c269dbdb | 508 | if (event == PTRACE_EVENT_FORK || event == PTRACE_EVENT_VFORK) |
de0d863e DB |
509 | { |
510 | struct process_info *parent_proc; | |
511 | struct process_info *child_proc; | |
512 | struct lwp_info *child_lwp; | |
bfacd19d | 513 | struct thread_info *child_thr; |
de0d863e DB |
514 | struct target_desc *tdesc; |
515 | ||
516 | ptid = ptid_build (new_pid, new_pid, 0); | |
517 | ||
518 | if (debug_threads) | |
519 | { | |
520 | debug_printf ("HEW: Got fork event from LWP %ld, " | |
521 | "new child is %d\n", | |
522 | ptid_get_lwp (ptid_of (event_thr)), | |
523 | ptid_get_pid (ptid)); | |
524 | } | |
525 | ||
526 | /* Add the new process to the tables and clone the breakpoint | |
527 | lists of the parent. We need to do this even if the new process | |
528 | will be detached, since we will need the process object and the | |
529 | breakpoints to remove any breakpoints from memory when we | |
530 | detach, and the client side will access registers. */ | |
531 | child_proc = linux_add_process (new_pid, 0); | |
532 | gdb_assert (child_proc != NULL); | |
533 | child_lwp = add_lwp (ptid); | |
534 | gdb_assert (child_lwp != NULL); | |
535 | child_lwp->stopped = 1; | |
bfacd19d DB |
536 | child_lwp->must_set_ptrace_flags = 1; |
537 | child_lwp->status_pending_p = 0; | |
538 | child_thr = get_lwp_thread (child_lwp); | |
539 | child_thr->last_resume_kind = resume_stop; | |
998d452a PA |
540 | child_thr->last_status.kind = TARGET_WAITKIND_STOPPED; |
541 | ||
863d01bd | 542 | /* If we're suspending all threads, leave this one suspended |
0f8288ae YQ |
543 | too. If the fork/clone parent is stepping over a breakpoint, |
544 | all other threads have been suspended already. Leave the | |
545 | child suspended too. */ | |
546 | if (stopping_threads == STOPPING_AND_SUSPENDING_THREADS | |
547 | || event_lwp->bp_reinsert != 0) | |
863d01bd PA |
548 | { |
549 | if (debug_threads) | |
550 | debug_printf ("HEW: leaving child suspended\n"); | |
551 | child_lwp->suspended = 1; | |
552 | } | |
553 | ||
de0d863e DB |
554 | parent_proc = get_thread_process (event_thr); |
555 | child_proc->attached = parent_proc->attached; | |
2e7b624b YQ |
556 | |
557 | if (event_lwp->bp_reinsert != 0 | |
558 | && can_software_single_step () | |
559 | && event == PTRACE_EVENT_VFORK) | |
560 | { | |
3b9a79ef YQ |
561 | /* If we leave single-step breakpoints there, child will |
562 | hit it, so uninsert single-step breakpoints from parent | |
2e7b624b YQ |
563 | (and child). Once vfork child is done, reinsert |
564 | them back to parent. */ | |
3b9a79ef | 565 | uninsert_single_step_breakpoints (event_thr); |
2e7b624b YQ |
566 | } |
567 | ||
63c40ec7 | 568 | clone_all_breakpoints (child_thr, event_thr); |
de0d863e | 569 | |
8d749320 | 570 | tdesc = XNEW (struct target_desc); |
de0d863e DB |
571 | copy_target_description (tdesc, parent_proc->tdesc); |
572 | child_proc->tdesc = tdesc; | |
de0d863e | 573 | |
3a8a0396 DB |
574 | /* Clone arch-specific process data. */ |
575 | if (the_low_target.new_fork != NULL) | |
576 | the_low_target.new_fork (parent_proc, child_proc); | |
577 | ||
de0d863e | 578 | /* Save fork info in the parent thread. */ |
c269dbdb DB |
579 | if (event == PTRACE_EVENT_FORK) |
580 | event_lwp->waitstatus.kind = TARGET_WAITKIND_FORKED; | |
581 | else if (event == PTRACE_EVENT_VFORK) | |
582 | event_lwp->waitstatus.kind = TARGET_WAITKIND_VFORKED; | |
583 | ||
de0d863e | 584 | event_lwp->waitstatus.value.related_pid = ptid; |
c269dbdb | 585 | |
de0d863e DB |
586 | /* The status_pending field contains bits denoting the |
587 | extended event, so when the pending event is handled, | |
588 | the handler will look at lwp->waitstatus. */ | |
589 | event_lwp->status_pending_p = 1; | |
590 | event_lwp->status_pending = wstat; | |
591 | ||
5a04c4cf PA |
592 | /* Link the threads until the parent event is passed on to |
593 | higher layers. */ | |
594 | event_lwp->fork_relative = child_lwp; | |
595 | child_lwp->fork_relative = event_lwp; | |
596 | ||
3b9a79ef YQ |
597 | /* If the parent thread is doing step-over with single-step |
598 | breakpoints, the list of single-step breakpoints are cloned | |
2e7b624b YQ |
599 | from the parent's. Remove them from the child process. |
600 | In case of vfork, we'll reinsert them back once vforked | |
601 | child is done. */ | |
8a81c5d7 | 602 | if (event_lwp->bp_reinsert != 0 |
2e7b624b | 603 | && can_software_single_step ()) |
8a81c5d7 | 604 | { |
8a81c5d7 YQ |
605 | /* The child process is forked and stopped, so it is safe |
606 | to access its memory without stopping all other threads | |
607 | from other processes. */ | |
3b9a79ef | 608 | delete_single_step_breakpoints (child_thr); |
8a81c5d7 | 609 | |
3b9a79ef YQ |
610 | gdb_assert (has_single_step_breakpoints (event_thr)); |
611 | gdb_assert (!has_single_step_breakpoints (child_thr)); | |
8a81c5d7 YQ |
612 | } |
613 | ||
de0d863e DB |
614 | /* Report the event. */ |
615 | return 0; | |
616 | } | |
617 | ||
fa96cb38 PA |
618 | if (debug_threads) |
619 | debug_printf ("HEW: Got clone event " | |
620 | "from LWP %ld, new child is LWP %ld\n", | |
621 | lwpid_of (event_thr), new_pid); | |
622 | ||
d86d4aaf | 623 | ptid = ptid_build (pid_of (event_thr), new_pid, 0); |
b3312d80 | 624 | new_lwp = add_lwp (ptid); |
24a09b5f | 625 | |
e27d73f6 DE |
626 | /* Either we're going to immediately resume the new thread |
627 | or leave it stopped. linux_resume_one_lwp is a nop if it | |
628 | thinks the thread is currently running, so set this first | |
629 | before calling linux_resume_one_lwp. */ | |
630 | new_lwp->stopped = 1; | |
631 | ||
0f8288ae YQ |
632 | /* If we're suspending all threads, leave this one suspended |
633 | too. If the fork/clone parent is stepping over a breakpoint, | |
634 | all other threads have been suspended already. Leave the | |
635 | child suspended too. */ | |
636 | if (stopping_threads == STOPPING_AND_SUSPENDING_THREADS | |
637 | || event_lwp->bp_reinsert != 0) | |
bde24c0a PA |
638 | new_lwp->suspended = 1; |
639 | ||
da5898ce DJ |
640 | /* Normally we will get the pending SIGSTOP. But in some cases |
641 | we might get another signal delivered to the group first. | |
f21cc1a2 | 642 | If we do get another signal, be sure not to lose it. */ |
20ba1ce6 | 643 | if (WSTOPSIG (status) != SIGSTOP) |
da5898ce | 644 | { |
54a0b537 | 645 | new_lwp->stop_expected = 1; |
20ba1ce6 PA |
646 | new_lwp->status_pending_p = 1; |
647 | new_lwp->status_pending = status; | |
da5898ce | 648 | } |
65706a29 PA |
649 | else if (report_thread_events) |
650 | { | |
651 | new_lwp->waitstatus.kind = TARGET_WAITKIND_THREAD_CREATED; | |
652 | new_lwp->status_pending_p = 1; | |
653 | new_lwp->status_pending = status; | |
654 | } | |
de0d863e DB |
655 | |
656 | /* Don't report the event. */ | |
657 | return 1; | |
24a09b5f | 658 | } |
c269dbdb DB |
659 | else if (event == PTRACE_EVENT_VFORK_DONE) |
660 | { | |
661 | event_lwp->waitstatus.kind = TARGET_WAITKIND_VFORK_DONE; | |
662 | ||
2e7b624b YQ |
663 | if (event_lwp->bp_reinsert != 0 && can_software_single_step ()) |
664 | { | |
3b9a79ef | 665 | reinsert_single_step_breakpoints (event_thr); |
2e7b624b | 666 | |
3b9a79ef | 667 | gdb_assert (has_single_step_breakpoints (event_thr)); |
2e7b624b YQ |
668 | } |
669 | ||
c269dbdb DB |
670 | /* Report the event. */ |
671 | return 0; | |
672 | } | |
94585166 DB |
673 | else if (event == PTRACE_EVENT_EXEC && report_exec_events) |
674 | { | |
675 | struct process_info *proc; | |
82075af2 | 676 | VEC (int) *syscalls_to_catch; |
94585166 DB |
677 | ptid_t event_ptid; |
678 | pid_t event_pid; | |
679 | ||
680 | if (debug_threads) | |
681 | { | |
682 | debug_printf ("HEW: Got exec event from LWP %ld\n", | |
683 | lwpid_of (event_thr)); | |
684 | } | |
685 | ||
686 | /* Get the event ptid. */ | |
687 | event_ptid = ptid_of (event_thr); | |
688 | event_pid = ptid_get_pid (event_ptid); | |
689 | ||
82075af2 | 690 | /* Save the syscall list from the execing process. */ |
94585166 | 691 | proc = get_thread_process (event_thr); |
82075af2 JS |
692 | syscalls_to_catch = proc->syscalls_to_catch; |
693 | proc->syscalls_to_catch = NULL; | |
694 | ||
695 | /* Delete the execing process and all its threads. */ | |
94585166 DB |
696 | linux_mourn (proc); |
697 | current_thread = NULL; | |
698 | ||
699 | /* Create a new process/lwp/thread. */ | |
700 | proc = linux_add_process (event_pid, 0); | |
701 | event_lwp = add_lwp (event_ptid); | |
702 | event_thr = get_lwp_thread (event_lwp); | |
703 | gdb_assert (current_thread == event_thr); | |
704 | linux_arch_setup_thread (event_thr); | |
705 | ||
706 | /* Set the event status. */ | |
707 | event_lwp->waitstatus.kind = TARGET_WAITKIND_EXECD; | |
708 | event_lwp->waitstatus.value.execd_pathname | |
709 | = xstrdup (linux_proc_pid_to_exec_file (lwpid_of (event_thr))); | |
710 | ||
711 | /* Mark the exec status as pending. */ | |
712 | event_lwp->stopped = 1; | |
713 | event_lwp->status_pending_p = 1; | |
714 | event_lwp->status_pending = wstat; | |
715 | event_thr->last_resume_kind = resume_continue; | |
716 | event_thr->last_status.kind = TARGET_WAITKIND_IGNORE; | |
717 | ||
82075af2 JS |
718 | /* Update syscall state in the new lwp, effectively mid-syscall too. */ |
719 | event_lwp->syscall_state = TARGET_WAITKIND_SYSCALL_ENTRY; | |
720 | ||
721 | /* Restore the list to catch. Don't rely on the client, which is free | |
722 | to avoid sending a new list when the architecture doesn't change. | |
723 | Also, for ANY_SYSCALL, the architecture doesn't really matter. */ | |
724 | proc->syscalls_to_catch = syscalls_to_catch; | |
725 | ||
94585166 DB |
726 | /* Report the event. */ |
727 | *orig_event_lwp = event_lwp; | |
728 | return 0; | |
729 | } | |
de0d863e DB |
730 | |
731 | internal_error (__FILE__, __LINE__, _("unknown ptrace event %d"), event); | |
24a09b5f DJ |
732 | } |
733 | ||
d50171e4 PA |
734 | /* Return the PC as read from the regcache of LWP, without any |
735 | adjustment. */ | |
736 | ||
737 | static CORE_ADDR | |
738 | get_pc (struct lwp_info *lwp) | |
739 | { | |
0bfdf32f | 740 | struct thread_info *saved_thread; |
d50171e4 PA |
741 | struct regcache *regcache; |
742 | CORE_ADDR pc; | |
743 | ||
744 | if (the_low_target.get_pc == NULL) | |
745 | return 0; | |
746 | ||
0bfdf32f GB |
747 | saved_thread = current_thread; |
748 | current_thread = get_lwp_thread (lwp); | |
d50171e4 | 749 | |
0bfdf32f | 750 | regcache = get_thread_regcache (current_thread, 1); |
d50171e4 PA |
751 | pc = (*the_low_target.get_pc) (regcache); |
752 | ||
753 | if (debug_threads) | |
87ce2a04 | 754 | debug_printf ("pc is 0x%lx\n", (long) pc); |
d50171e4 | 755 | |
0bfdf32f | 756 | current_thread = saved_thread; |
d50171e4 PA |
757 | return pc; |
758 | } | |
759 | ||
82075af2 | 760 | /* This function should only be called if LWP got a SYSCALL_SIGTRAP. |
4cc32bec | 761 | Fill *SYSNO with the syscall nr trapped. */ |
82075af2 JS |
762 | |
763 | static void | |
4cc32bec | 764 | get_syscall_trapinfo (struct lwp_info *lwp, int *sysno) |
82075af2 JS |
765 | { |
766 | struct thread_info *saved_thread; | |
767 | struct regcache *regcache; | |
768 | ||
769 | if (the_low_target.get_syscall_trapinfo == NULL) | |
770 | { | |
771 | /* If we cannot get the syscall trapinfo, report an unknown | |
4cc32bec | 772 | system call number. */ |
82075af2 | 773 | *sysno = UNKNOWN_SYSCALL; |
82075af2 JS |
774 | return; |
775 | } | |
776 | ||
777 | saved_thread = current_thread; | |
778 | current_thread = get_lwp_thread (lwp); | |
779 | ||
780 | regcache = get_thread_regcache (current_thread, 1); | |
4cc32bec | 781 | (*the_low_target.get_syscall_trapinfo) (regcache, sysno); |
82075af2 JS |
782 | |
783 | if (debug_threads) | |
4cc32bec | 784 | debug_printf ("get_syscall_trapinfo sysno %d\n", *sysno); |
82075af2 JS |
785 | |
786 | current_thread = saved_thread; | |
787 | } | |
788 | ||
e7ad2f14 | 789 | static int check_stopped_by_watchpoint (struct lwp_info *child); |
0d62e5e8 | 790 | |
e7ad2f14 PA |
791 | /* Called when the LWP stopped for a signal/trap. If it stopped for a |
792 | trap check what caused it (breakpoint, watchpoint, trace, etc.), | |
793 | and save the result in the LWP's stop_reason field. If it stopped | |
794 | for a breakpoint, decrement the PC if necessary on the lwp's | |
795 | architecture. Returns true if we now have the LWP's stop PC. */ | |
0d62e5e8 | 796 | |
582511be | 797 | static int |
e7ad2f14 | 798 | save_stop_reason (struct lwp_info *lwp) |
0d62e5e8 | 799 | { |
582511be PA |
800 | CORE_ADDR pc; |
801 | CORE_ADDR sw_breakpoint_pc; | |
802 | struct thread_info *saved_thread; | |
3e572f71 PA |
803 | #if USE_SIGTRAP_SIGINFO |
804 | siginfo_t siginfo; | |
805 | #endif | |
d50171e4 PA |
806 | |
807 | if (the_low_target.get_pc == NULL) | |
808 | return 0; | |
0d62e5e8 | 809 | |
582511be PA |
810 | pc = get_pc (lwp); |
811 | sw_breakpoint_pc = pc - the_low_target.decr_pc_after_break; | |
d50171e4 | 812 | |
582511be PA |
813 | /* breakpoint_at reads from the current thread. */ |
814 | saved_thread = current_thread; | |
815 | current_thread = get_lwp_thread (lwp); | |
47c0c975 | 816 | |
3e572f71 PA |
817 | #if USE_SIGTRAP_SIGINFO |
818 | if (ptrace (PTRACE_GETSIGINFO, lwpid_of (current_thread), | |
819 | (PTRACE_TYPE_ARG3) 0, &siginfo) == 0) | |
820 | { | |
821 | if (siginfo.si_signo == SIGTRAP) | |
822 | { | |
e7ad2f14 PA |
823 | if (GDB_ARCH_IS_TRAP_BRKPT (siginfo.si_code) |
824 | && GDB_ARCH_IS_TRAP_HWBKPT (siginfo.si_code)) | |
3e572f71 | 825 | { |
e7ad2f14 PA |
826 | /* The si_code is ambiguous on this arch -- check debug |
827 | registers. */ | |
828 | if (!check_stopped_by_watchpoint (lwp)) | |
829 | lwp->stop_reason = TARGET_STOPPED_BY_SW_BREAKPOINT; | |
830 | } | |
831 | else if (GDB_ARCH_IS_TRAP_BRKPT (siginfo.si_code)) | |
832 | { | |
833 | /* If we determine the LWP stopped for a SW breakpoint, | |
834 | trust it. Particularly don't check watchpoint | |
835 | registers, because at least on s390, we'd find | |
836 | stopped-by-watchpoint as long as there's a watchpoint | |
837 | set. */ | |
3e572f71 | 838 | lwp->stop_reason = TARGET_STOPPED_BY_SW_BREAKPOINT; |
3e572f71 | 839 | } |
e7ad2f14 | 840 | else if (GDB_ARCH_IS_TRAP_HWBKPT (siginfo.si_code)) |
3e572f71 | 841 | { |
e7ad2f14 PA |
842 | /* This can indicate either a hardware breakpoint or |
843 | hardware watchpoint. Check debug registers. */ | |
844 | if (!check_stopped_by_watchpoint (lwp)) | |
845 | lwp->stop_reason = TARGET_STOPPED_BY_HW_BREAKPOINT; | |
3e572f71 | 846 | } |
2bf6fb9d PA |
847 | else if (siginfo.si_code == TRAP_TRACE) |
848 | { | |
e7ad2f14 PA |
849 | /* We may have single stepped an instruction that |
850 | triggered a watchpoint. In that case, on some | |
851 | architectures (such as x86), instead of TRAP_HWBKPT, | |
852 | si_code indicates TRAP_TRACE, and we need to check | |
853 | the debug registers separately. */ | |
854 | if (!check_stopped_by_watchpoint (lwp)) | |
855 | lwp->stop_reason = TARGET_STOPPED_BY_SINGLE_STEP; | |
2bf6fb9d | 856 | } |
3e572f71 PA |
857 | } |
858 | } | |
859 | #else | |
582511be PA |
860 | /* We may have just stepped a breakpoint instruction. E.g., in |
861 | non-stop mode, GDB first tells the thread A to step a range, and | |
862 | then the user inserts a breakpoint inside the range. In that | |
8090aef2 PA |
863 | case we need to report the breakpoint PC. */ |
864 | if ((!lwp->stepping || lwp->stop_pc == sw_breakpoint_pc) | |
582511be | 865 | && (*the_low_target.breakpoint_at) (sw_breakpoint_pc)) |
e7ad2f14 PA |
866 | lwp->stop_reason = TARGET_STOPPED_BY_SW_BREAKPOINT; |
867 | ||
868 | if (hardware_breakpoint_inserted_here (pc)) | |
869 | lwp->stop_reason = TARGET_STOPPED_BY_HW_BREAKPOINT; | |
870 | ||
871 | if (lwp->stop_reason == TARGET_STOPPED_BY_NO_REASON) | |
872 | check_stopped_by_watchpoint (lwp); | |
873 | #endif | |
874 | ||
875 | if (lwp->stop_reason == TARGET_STOPPED_BY_SW_BREAKPOINT) | |
582511be PA |
876 | { |
877 | if (debug_threads) | |
878 | { | |
879 | struct thread_info *thr = get_lwp_thread (lwp); | |
880 | ||
881 | debug_printf ("CSBB: %s stopped by software breakpoint\n", | |
882 | target_pid_to_str (ptid_of (thr))); | |
883 | } | |
884 | ||
885 | /* Back up the PC if necessary. */ | |
886 | if (pc != sw_breakpoint_pc) | |
e7ad2f14 | 887 | { |
582511be PA |
888 | struct regcache *regcache |
889 | = get_thread_regcache (current_thread, 1); | |
890 | (*the_low_target.set_pc) (regcache, sw_breakpoint_pc); | |
891 | } | |
892 | ||
e7ad2f14 PA |
893 | /* Update this so we record the correct stop PC below. */ |
894 | pc = sw_breakpoint_pc; | |
582511be | 895 | } |
e7ad2f14 | 896 | else if (lwp->stop_reason == TARGET_STOPPED_BY_HW_BREAKPOINT) |
582511be PA |
897 | { |
898 | if (debug_threads) | |
899 | { | |
900 | struct thread_info *thr = get_lwp_thread (lwp); | |
901 | ||
902 | debug_printf ("CSBB: %s stopped by hardware breakpoint\n", | |
903 | target_pid_to_str (ptid_of (thr))); | |
904 | } | |
e7ad2f14 PA |
905 | } |
906 | else if (lwp->stop_reason == TARGET_STOPPED_BY_WATCHPOINT) | |
907 | { | |
908 | if (debug_threads) | |
909 | { | |
910 | struct thread_info *thr = get_lwp_thread (lwp); | |
47c0c975 | 911 | |
e7ad2f14 PA |
912 | debug_printf ("CSBB: %s stopped by hardware watchpoint\n", |
913 | target_pid_to_str (ptid_of (thr))); | |
914 | } | |
582511be | 915 | } |
e7ad2f14 PA |
916 | else if (lwp->stop_reason == TARGET_STOPPED_BY_SINGLE_STEP) |
917 | { | |
918 | if (debug_threads) | |
919 | { | |
920 | struct thread_info *thr = get_lwp_thread (lwp); | |
582511be | 921 | |
e7ad2f14 PA |
922 | debug_printf ("CSBB: %s stopped by trace\n", |
923 | target_pid_to_str (ptid_of (thr))); | |
924 | } | |
925 | } | |
926 | ||
927 | lwp->stop_pc = pc; | |
582511be | 928 | current_thread = saved_thread; |
e7ad2f14 | 929 | return 1; |
0d62e5e8 | 930 | } |
ce3a066d | 931 | |
b3312d80 | 932 | static struct lwp_info * |
95954743 | 933 | add_lwp (ptid_t ptid) |
611cb4a5 | 934 | { |
54a0b537 | 935 | struct lwp_info *lwp; |
0d62e5e8 | 936 | |
8d749320 | 937 | lwp = XCNEW (struct lwp_info); |
00db26fa PA |
938 | |
939 | lwp->waitstatus.kind = TARGET_WAITKIND_IGNORE; | |
0d62e5e8 | 940 | |
aa5ca48f | 941 | if (the_low_target.new_thread != NULL) |
34c703da | 942 | the_low_target.new_thread (lwp); |
aa5ca48f | 943 | |
f7667f0d | 944 | lwp->thread = add_thread (ptid, lwp); |
0d62e5e8 | 945 | |
54a0b537 | 946 | return lwp; |
0d62e5e8 | 947 | } |
611cb4a5 | 948 | |
da6d8c04 DJ |
949 | /* Start an inferior process and returns its pid. |
950 | ALLARGS is a vector of program-name and args. */ | |
951 | ||
ce3a066d DJ |
952 | static int |
953 | linux_create_inferior (char *program, char **allargs) | |
da6d8c04 | 954 | { |
a6dbe5df | 955 | struct lwp_info *new_lwp; |
da6d8c04 | 956 | int pid; |
95954743 | 957 | ptid_t ptid; |
8cc73a39 SDJ |
958 | struct cleanup *restore_personality |
959 | = maybe_disable_address_space_randomization (disable_randomization); | |
03583c20 | 960 | |
42c81e2a | 961 | #if defined(__UCLIBC__) && defined(HAS_NOMMU) |
52fb6437 NS |
962 | pid = vfork (); |
963 | #else | |
da6d8c04 | 964 | pid = fork (); |
52fb6437 | 965 | #endif |
da6d8c04 DJ |
966 | if (pid < 0) |
967 | perror_with_name ("fork"); | |
968 | ||
969 | if (pid == 0) | |
970 | { | |
602e3198 | 971 | close_most_fds (); |
b8e1b30e | 972 | ptrace (PTRACE_TRACEME, 0, (PTRACE_TYPE_ARG3) 0, (PTRACE_TYPE_ARG4) 0); |
da6d8c04 | 973 | |
a9fa9f7d DJ |
974 | setpgid (0, 0); |
975 | ||
e0f9f062 DE |
976 | /* If gdbserver is connected to gdb via stdio, redirect the inferior's |
977 | stdout to stderr so that inferior i/o doesn't corrupt the connection. | |
978 | Also, redirect stdin to /dev/null. */ | |
979 | if (remote_connection_is_stdio ()) | |
980 | { | |
981 | close (0); | |
982 | open ("/dev/null", O_RDONLY); | |
983 | dup2 (2, 1); | |
3e52c33d JK |
984 | if (write (2, "stdin/stdout redirected\n", |
985 | sizeof ("stdin/stdout redirected\n") - 1) < 0) | |
8c29b58e YQ |
986 | { |
987 | /* Errors ignored. */; | |
988 | } | |
e0f9f062 DE |
989 | } |
990 | ||
f348d89a PA |
991 | restore_original_signals_state (); |
992 | ||
2b876972 DJ |
993 | execv (program, allargs); |
994 | if (errno == ENOENT) | |
995 | execvp (program, allargs); | |
da6d8c04 DJ |
996 | |
997 | fprintf (stderr, "Cannot exec %s: %s.\n", program, | |
d07c63e7 | 998 | strerror (errno)); |
da6d8c04 DJ |
999 | fflush (stderr); |
1000 | _exit (0177); | |
1001 | } | |
1002 | ||
8cc73a39 | 1003 | do_cleanups (restore_personality); |
03583c20 | 1004 | |
55d7b841 | 1005 | linux_add_process (pid, 0); |
95954743 PA |
1006 | |
1007 | ptid = ptid_build (pid, pid, 0); | |
1008 | new_lwp = add_lwp (ptid); | |
a6dbe5df | 1009 | new_lwp->must_set_ptrace_flags = 1; |
611cb4a5 | 1010 | |
a9fa9f7d | 1011 | return pid; |
da6d8c04 DJ |
1012 | } |
1013 | ||
ece66d65 JS |
1014 | /* Implement the post_create_inferior target_ops method. */ |
1015 | ||
1016 | static void | |
1017 | linux_post_create_inferior (void) | |
1018 | { | |
1019 | struct lwp_info *lwp = get_thread_lwp (current_thread); | |
1020 | ||
1021 | linux_arch_setup (); | |
1022 | ||
1023 | if (lwp->must_set_ptrace_flags) | |
1024 | { | |
1025 | struct process_info *proc = current_process (); | |
1026 | int options = linux_low_ptrace_options (proc->attached); | |
1027 | ||
1028 | linux_enable_event_reporting (lwpid_of (current_thread), options); | |
1029 | lwp->must_set_ptrace_flags = 0; | |
1030 | } | |
1031 | } | |
1032 | ||
8784d563 PA |
1033 | /* Attach to an inferior process. Returns 0 on success, ERRNO on |
1034 | error. */ | |
da6d8c04 | 1035 | |
7ae1a6a6 PA |
1036 | int |
1037 | linux_attach_lwp (ptid_t ptid) | |
da6d8c04 | 1038 | { |
54a0b537 | 1039 | struct lwp_info *new_lwp; |
7ae1a6a6 | 1040 | int lwpid = ptid_get_lwp (ptid); |
611cb4a5 | 1041 | |
b8e1b30e | 1042 | if (ptrace (PTRACE_ATTACH, lwpid, (PTRACE_TYPE_ARG3) 0, (PTRACE_TYPE_ARG4) 0) |
56f7af9c | 1043 | != 0) |
7ae1a6a6 | 1044 | return errno; |
24a09b5f | 1045 | |
b3312d80 | 1046 | new_lwp = add_lwp (ptid); |
0d62e5e8 | 1047 | |
a6dbe5df PA |
1048 | /* We need to wait for SIGSTOP before being able to make the next |
1049 | ptrace call on this LWP. */ | |
1050 | new_lwp->must_set_ptrace_flags = 1; | |
1051 | ||
644cebc9 | 1052 | if (linux_proc_pid_is_stopped (lwpid)) |
c14d7ab2 PA |
1053 | { |
1054 | if (debug_threads) | |
87ce2a04 | 1055 | debug_printf ("Attached to a stopped process\n"); |
c14d7ab2 PA |
1056 | |
1057 | /* The process is definitely stopped. It is in a job control | |
1058 | stop, unless the kernel predates the TASK_STOPPED / | |
1059 | TASK_TRACED distinction, in which case it might be in a | |
1060 | ptrace stop. Make sure it is in a ptrace stop; from there we | |
1061 | can kill it, signal it, et cetera. | |
1062 | ||
1063 | First make sure there is a pending SIGSTOP. Since we are | |
1064 | already attached, the process can not transition from stopped | |
1065 | to running without a PTRACE_CONT; so we know this signal will | |
1066 | go into the queue. The SIGSTOP generated by PTRACE_ATTACH is | |
1067 | probably already in the queue (unless this kernel is old | |
1068 | enough to use TASK_STOPPED for ptrace stops); but since | |
1069 | SIGSTOP is not an RT signal, it can only be queued once. */ | |
1070 | kill_lwp (lwpid, SIGSTOP); | |
1071 | ||
1072 | /* Finally, resume the stopped process. This will deliver the | |
1073 | SIGSTOP (or a higher priority signal, just like normal | |
1074 | PTRACE_ATTACH), which we'll catch later on. */ | |
b8e1b30e | 1075 | ptrace (PTRACE_CONT, lwpid, (PTRACE_TYPE_ARG3) 0, (PTRACE_TYPE_ARG4) 0); |
c14d7ab2 PA |
1076 | } |
1077 | ||
0d62e5e8 | 1078 | /* The next time we wait for this LWP we'll see a SIGSTOP as PTRACE_ATTACH |
0e21c1ec DE |
1079 | brings it to a halt. |
1080 | ||
1081 | There are several cases to consider here: | |
1082 | ||
1083 | 1) gdbserver has already attached to the process and is being notified | |
1b3f6016 | 1084 | of a new thread that is being created. |
d50171e4 PA |
1085 | In this case we should ignore that SIGSTOP and resume the |
1086 | process. This is handled below by setting stop_expected = 1, | |
8336d594 | 1087 | and the fact that add_thread sets last_resume_kind == |
d50171e4 | 1088 | resume_continue. |
0e21c1ec DE |
1089 | |
1090 | 2) This is the first thread (the process thread), and we're attaching | |
1b3f6016 PA |
1091 | to it via attach_inferior. |
1092 | In this case we want the process thread to stop. | |
d50171e4 PA |
1093 | This is handled by having linux_attach set last_resume_kind == |
1094 | resume_stop after we return. | |
e3deef73 LM |
1095 | |
1096 | If the pid we are attaching to is also the tgid, we attach to and | |
1097 | stop all the existing threads. Otherwise, we attach to pid and | |
1098 | ignore any other threads in the same group as this pid. | |
0e21c1ec DE |
1099 | |
1100 | 3) GDB is connecting to gdbserver and is requesting an enumeration of all | |
1b3f6016 PA |
1101 | existing threads. |
1102 | In this case we want the thread to stop. | |
1103 | FIXME: This case is currently not properly handled. | |
1104 | We should wait for the SIGSTOP but don't. Things work apparently | |
1105 | because enough time passes between when we ptrace (ATTACH) and when | |
1106 | gdb makes the next ptrace call on the thread. | |
0d62e5e8 DJ |
1107 | |
1108 | On the other hand, if we are currently trying to stop all threads, we | |
1109 | should treat the new thread as if we had sent it a SIGSTOP. This works | |
54a0b537 | 1110 | because we are guaranteed that the add_lwp call above added us to the |
0e21c1ec DE |
1111 | end of the list, and so the new thread has not yet reached |
1112 | wait_for_sigstop (but will). */ | |
d50171e4 | 1113 | new_lwp->stop_expected = 1; |
0d62e5e8 | 1114 | |
7ae1a6a6 | 1115 | return 0; |
95954743 PA |
1116 | } |
1117 | ||
8784d563 PA |
1118 | /* Callback for linux_proc_attach_tgid_threads. Attach to PTID if not |
1119 | already attached. Returns true if a new LWP is found, false | |
1120 | otherwise. */ | |
1121 | ||
1122 | static int | |
1123 | attach_proc_task_lwp_callback (ptid_t ptid) | |
1124 | { | |
1125 | /* Is this a new thread? */ | |
1126 | if (find_thread_ptid (ptid) == NULL) | |
1127 | { | |
1128 | int lwpid = ptid_get_lwp (ptid); | |
1129 | int err; | |
1130 | ||
1131 | if (debug_threads) | |
1132 | debug_printf ("Found new lwp %d\n", lwpid); | |
1133 | ||
1134 | err = linux_attach_lwp (ptid); | |
1135 | ||
1136 | /* Be quiet if we simply raced with the thread exiting. EPERM | |
1137 | is returned if the thread's task still exists, and is marked | |
1138 | as exited or zombie, as well as other conditions, so in that | |
1139 | case, confirm the status in /proc/PID/status. */ | |
1140 | if (err == ESRCH | |
1141 | || (err == EPERM && linux_proc_pid_is_gone (lwpid))) | |
1142 | { | |
1143 | if (debug_threads) | |
1144 | { | |
1145 | debug_printf ("Cannot attach to lwp %d: " | |
1146 | "thread is gone (%d: %s)\n", | |
1147 | lwpid, err, strerror (err)); | |
1148 | } | |
1149 | } | |
1150 | else if (err != 0) | |
1151 | { | |
1152 | warning (_("Cannot attach to lwp %d: %s"), | |
1153 | lwpid, | |
1154 | linux_ptrace_attach_fail_reason_string (ptid, err)); | |
1155 | } | |
1156 | ||
1157 | return 1; | |
1158 | } | |
1159 | return 0; | |
1160 | } | |
1161 | ||
500c1d85 PA |
1162 | static void async_file_mark (void); |
1163 | ||
e3deef73 LM |
1164 | /* Attach to PID. If PID is the tgid, attach to it and all |
1165 | of its threads. */ | |
1166 | ||
c52daf70 | 1167 | static int |
a1928bad | 1168 | linux_attach (unsigned long pid) |
0d62e5e8 | 1169 | { |
500c1d85 PA |
1170 | struct process_info *proc; |
1171 | struct thread_info *initial_thread; | |
7ae1a6a6 PA |
1172 | ptid_t ptid = ptid_build (pid, pid, 0); |
1173 | int err; | |
1174 | ||
e3deef73 LM |
1175 | /* Attach to PID. We will check for other threads |
1176 | soon. */ | |
7ae1a6a6 PA |
1177 | err = linux_attach_lwp (ptid); |
1178 | if (err != 0) | |
1179 | error ("Cannot attach to process %ld: %s", | |
8784d563 | 1180 | pid, linux_ptrace_attach_fail_reason_string (ptid, err)); |
7ae1a6a6 | 1181 | |
500c1d85 | 1182 | proc = linux_add_process (pid, 1); |
0d62e5e8 | 1183 | |
500c1d85 PA |
1184 | /* Don't ignore the initial SIGSTOP if we just attached to this |
1185 | process. It will be collected by wait shortly. */ | |
1186 | initial_thread = find_thread_ptid (ptid_build (pid, pid, 0)); | |
1187 | initial_thread->last_resume_kind = resume_stop; | |
0d62e5e8 | 1188 | |
8784d563 PA |
1189 | /* We must attach to every LWP. If /proc is mounted, use that to |
1190 | find them now. On the one hand, the inferior may be using raw | |
1191 | clone instead of using pthreads. On the other hand, even if it | |
1192 | is using pthreads, GDB may not be connected yet (thread_db needs | |
1193 | to do symbol lookups, through qSymbol). Also, thread_db walks | |
1194 | structures in the inferior's address space to find the list of | |
1195 | threads/LWPs, and those structures may well be corrupted. Note | |
1196 | that once thread_db is loaded, we'll still use it to list threads | |
1197 | and associate pthread info with each LWP. */ | |
1198 | linux_proc_attach_tgid_threads (pid, attach_proc_task_lwp_callback); | |
500c1d85 PA |
1199 | |
1200 | /* GDB will shortly read the xml target description for this | |
1201 | process, to figure out the process' architecture. But the target | |
1202 | description is only filled in when the first process/thread in | |
1203 | the thread group reports its initial PTRACE_ATTACH SIGSTOP. Do | |
1204 | that now, otherwise, if GDB is fast enough, it could read the | |
1205 | target description _before_ that initial stop. */ | |
1206 | if (non_stop) | |
1207 | { | |
1208 | struct lwp_info *lwp; | |
1209 | int wstat, lwpid; | |
1210 | ptid_t pid_ptid = pid_to_ptid (pid); | |
1211 | ||
1212 | lwpid = linux_wait_for_event_filtered (pid_ptid, pid_ptid, | |
1213 | &wstat, __WALL); | |
1214 | gdb_assert (lwpid > 0); | |
1215 | ||
1216 | lwp = find_lwp_pid (pid_to_ptid (lwpid)); | |
1217 | ||
1218 | if (!WIFSTOPPED (wstat) || WSTOPSIG (wstat) != SIGSTOP) | |
1219 | { | |
1220 | lwp->status_pending_p = 1; | |
1221 | lwp->status_pending = wstat; | |
1222 | } | |
1223 | ||
1224 | initial_thread->last_resume_kind = resume_continue; | |
1225 | ||
1226 | async_file_mark (); | |
1227 | ||
1228 | gdb_assert (proc->tdesc != NULL); | |
1229 | } | |
1230 | ||
95954743 PA |
1231 | return 0; |
1232 | } | |
1233 | ||
1234 | struct counter | |
1235 | { | |
1236 | int pid; | |
1237 | int count; | |
1238 | }; | |
1239 | ||
1240 | static int | |
1241 | second_thread_of_pid_p (struct inferior_list_entry *entry, void *args) | |
1242 | { | |
9a3c8263 | 1243 | struct counter *counter = (struct counter *) args; |
95954743 PA |
1244 | |
1245 | if (ptid_get_pid (entry->id) == counter->pid) | |
1246 | { | |
1247 | if (++counter->count > 1) | |
1248 | return 1; | |
1249 | } | |
d61ddec4 | 1250 | |
da6d8c04 DJ |
1251 | return 0; |
1252 | } | |
1253 | ||
95954743 | 1254 | static int |
fa96cb38 | 1255 | last_thread_of_process_p (int pid) |
95954743 | 1256 | { |
95954743 | 1257 | struct counter counter = { pid , 0 }; |
da6d8c04 | 1258 | |
95954743 PA |
1259 | return (find_inferior (&all_threads, |
1260 | second_thread_of_pid_p, &counter) == NULL); | |
1261 | } | |
1262 | ||
da84f473 PA |
1263 | /* Kill LWP. */ |
1264 | ||
1265 | static void | |
1266 | linux_kill_one_lwp (struct lwp_info *lwp) | |
1267 | { | |
d86d4aaf DE |
1268 | struct thread_info *thr = get_lwp_thread (lwp); |
1269 | int pid = lwpid_of (thr); | |
da84f473 PA |
1270 | |
1271 | /* PTRACE_KILL is unreliable. After stepping into a signal handler, | |
1272 | there is no signal context, and ptrace(PTRACE_KILL) (or | |
1273 | ptrace(PTRACE_CONT, SIGKILL), pretty much the same) acts like | |
1274 | ptrace(CONT, pid, 0,0) and just resumes the tracee. A better | |
1275 | alternative is to kill with SIGKILL. We only need one SIGKILL | |
1276 | per process, not one for each thread. But since we still support | |
4a6ed09b PA |
1277 | support debugging programs using raw clone without CLONE_THREAD, |
1278 | we send one for each thread. For years, we used PTRACE_KILL | |
1279 | only, so we're being a bit paranoid about some old kernels where | |
1280 | PTRACE_KILL might work better (dubious if there are any such, but | |
1281 | that's why it's paranoia), so we try SIGKILL first, PTRACE_KILL | |
1282 | second, and so we're fine everywhere. */ | |
da84f473 PA |
1283 | |
1284 | errno = 0; | |
69ff6be5 | 1285 | kill_lwp (pid, SIGKILL); |
da84f473 | 1286 | if (debug_threads) |
ce9e3fe7 PA |
1287 | { |
1288 | int save_errno = errno; | |
1289 | ||
1290 | debug_printf ("LKL: kill_lwp (SIGKILL) %s, 0, 0 (%s)\n", | |
1291 | target_pid_to_str (ptid_of (thr)), | |
1292 | save_errno ? strerror (save_errno) : "OK"); | |
1293 | } | |
da84f473 PA |
1294 | |
1295 | errno = 0; | |
b8e1b30e | 1296 | ptrace (PTRACE_KILL, pid, (PTRACE_TYPE_ARG3) 0, (PTRACE_TYPE_ARG4) 0); |
da84f473 | 1297 | if (debug_threads) |
ce9e3fe7 PA |
1298 | { |
1299 | int save_errno = errno; | |
1300 | ||
1301 | debug_printf ("LKL: PTRACE_KILL %s, 0, 0 (%s)\n", | |
1302 | target_pid_to_str (ptid_of (thr)), | |
1303 | save_errno ? strerror (save_errno) : "OK"); | |
1304 | } | |
da84f473 PA |
1305 | } |
1306 | ||
e76126e8 PA |
1307 | /* Kill LWP and wait for it to die. */ |
1308 | ||
1309 | static void | |
1310 | kill_wait_lwp (struct lwp_info *lwp) | |
1311 | { | |
1312 | struct thread_info *thr = get_lwp_thread (lwp); | |
1313 | int pid = ptid_get_pid (ptid_of (thr)); | |
1314 | int lwpid = ptid_get_lwp (ptid_of (thr)); | |
1315 | int wstat; | |
1316 | int res; | |
1317 | ||
1318 | if (debug_threads) | |
1319 | debug_printf ("kwl: killing lwp %d, for pid: %d\n", lwpid, pid); | |
1320 | ||
1321 | do | |
1322 | { | |
1323 | linux_kill_one_lwp (lwp); | |
1324 | ||
1325 | /* Make sure it died. Notes: | |
1326 | ||
1327 | - The loop is most likely unnecessary. | |
1328 | ||
1329 | - We don't use linux_wait_for_event as that could delete lwps | |
1330 | while we're iterating over them. We're not interested in | |
1331 | any pending status at this point, only in making sure all | |
1332 | wait status on the kernel side are collected until the | |
1333 | process is reaped. | |
1334 | ||
1335 | - We don't use __WALL here as the __WALL emulation relies on | |
1336 | SIGCHLD, and killing a stopped process doesn't generate | |
1337 | one, nor an exit status. | |
1338 | */ | |
1339 | res = my_waitpid (lwpid, &wstat, 0); | |
1340 | if (res == -1 && errno == ECHILD) | |
1341 | res = my_waitpid (lwpid, &wstat, __WCLONE); | |
1342 | } while (res > 0 && WIFSTOPPED (wstat)); | |
1343 | ||
586b02a9 PA |
1344 | /* Even if it was stopped, the child may have already disappeared. |
1345 | E.g., if it was killed by SIGKILL. */ | |
1346 | if (res < 0 && errno != ECHILD) | |
1347 | perror_with_name ("kill_wait_lwp"); | |
e76126e8 PA |
1348 | } |
1349 | ||
da84f473 PA |
1350 | /* Callback for `find_inferior'. Kills an lwp of a given process, |
1351 | except the leader. */ | |
95954743 PA |
1352 | |
1353 | static int | |
da84f473 | 1354 | kill_one_lwp_callback (struct inferior_list_entry *entry, void *args) |
da6d8c04 | 1355 | { |
0d62e5e8 | 1356 | struct thread_info *thread = (struct thread_info *) entry; |
54a0b537 | 1357 | struct lwp_info *lwp = get_thread_lwp (thread); |
95954743 PA |
1358 | int pid = * (int *) args; |
1359 | ||
1360 | if (ptid_get_pid (entry->id) != pid) | |
1361 | return 0; | |
0d62e5e8 | 1362 | |
fd500816 DJ |
1363 | /* We avoid killing the first thread here, because of a Linux kernel (at |
1364 | least 2.6.0-test7 through 2.6.8-rc4) bug; if we kill the parent before | |
1365 | the children get a chance to be reaped, it will remain a zombie | |
1366 | forever. */ | |
95954743 | 1367 | |
d86d4aaf | 1368 | if (lwpid_of (thread) == pid) |
95954743 PA |
1369 | { |
1370 | if (debug_threads) | |
87ce2a04 DE |
1371 | debug_printf ("lkop: is last of process %s\n", |
1372 | target_pid_to_str (entry->id)); | |
95954743 PA |
1373 | return 0; |
1374 | } | |
fd500816 | 1375 | |
e76126e8 | 1376 | kill_wait_lwp (lwp); |
95954743 | 1377 | return 0; |
da6d8c04 DJ |
1378 | } |
1379 | ||
95954743 PA |
1380 | static int |
1381 | linux_kill (int pid) | |
0d62e5e8 | 1382 | { |
95954743 | 1383 | struct process_info *process; |
54a0b537 | 1384 | struct lwp_info *lwp; |
fd500816 | 1385 | |
95954743 PA |
1386 | process = find_process_pid (pid); |
1387 | if (process == NULL) | |
1388 | return -1; | |
9d606399 | 1389 | |
f9e39928 PA |
1390 | /* If we're killing a running inferior, make sure it is stopped |
1391 | first, as PTRACE_KILL will not work otherwise. */ | |
7984d532 | 1392 | stop_all_lwps (0, NULL); |
f9e39928 | 1393 | |
da84f473 | 1394 | find_inferior (&all_threads, kill_one_lwp_callback , &pid); |
fd500816 | 1395 | |
54a0b537 | 1396 | /* See the comment in linux_kill_one_lwp. We did not kill the first |
fd500816 | 1397 | thread in the list, so do so now. */ |
95954743 | 1398 | lwp = find_lwp_pid (pid_to_ptid (pid)); |
bd99dc85 | 1399 | |
784867a5 | 1400 | if (lwp == NULL) |
fd500816 | 1401 | { |
784867a5 | 1402 | if (debug_threads) |
d86d4aaf DE |
1403 | debug_printf ("lk_1: cannot find lwp for pid: %d\n", |
1404 | pid); | |
784867a5 JK |
1405 | } |
1406 | else | |
e76126e8 | 1407 | kill_wait_lwp (lwp); |
2d717e4f | 1408 | |
8336d594 | 1409 | the_target->mourn (process); |
f9e39928 PA |
1410 | |
1411 | /* Since we presently can only stop all lwps of all processes, we | |
1412 | need to unstop lwps of other processes. */ | |
7984d532 | 1413 | unstop_all_lwps (0, NULL); |
95954743 | 1414 | return 0; |
0d62e5e8 DJ |
1415 | } |
1416 | ||
9b224c5e PA |
1417 | /* Get pending signal of THREAD, for detaching purposes. This is the |
1418 | signal the thread last stopped for, which we need to deliver to the | |
1419 | thread when detaching, otherwise, it'd be suppressed/lost. */ | |
1420 | ||
1421 | static int | |
1422 | get_detach_signal (struct thread_info *thread) | |
1423 | { | |
a493e3e2 | 1424 | enum gdb_signal signo = GDB_SIGNAL_0; |
9b224c5e PA |
1425 | int status; |
1426 | struct lwp_info *lp = get_thread_lwp (thread); | |
1427 | ||
1428 | if (lp->status_pending_p) | |
1429 | status = lp->status_pending; | |
1430 | else | |
1431 | { | |
1432 | /* If the thread had been suspended by gdbserver, and it stopped | |
1433 | cleanly, then it'll have stopped with SIGSTOP. But we don't | |
1434 | want to deliver that SIGSTOP. */ | |
1435 | if (thread->last_status.kind != TARGET_WAITKIND_STOPPED | |
a493e3e2 | 1436 | || thread->last_status.value.sig == GDB_SIGNAL_0) |
9b224c5e PA |
1437 | return 0; |
1438 | ||
1439 | /* Otherwise, we may need to deliver the signal we | |
1440 | intercepted. */ | |
1441 | status = lp->last_status; | |
1442 | } | |
1443 | ||
1444 | if (!WIFSTOPPED (status)) | |
1445 | { | |
1446 | if (debug_threads) | |
87ce2a04 | 1447 | debug_printf ("GPS: lwp %s hasn't stopped: no pending signal\n", |
d86d4aaf | 1448 | target_pid_to_str (ptid_of (thread))); |
9b224c5e PA |
1449 | return 0; |
1450 | } | |
1451 | ||
1452 | /* Extended wait statuses aren't real SIGTRAPs. */ | |
89a5711c | 1453 | if (WSTOPSIG (status) == SIGTRAP && linux_is_extended_waitstatus (status)) |
9b224c5e PA |
1454 | { |
1455 | if (debug_threads) | |
87ce2a04 DE |
1456 | debug_printf ("GPS: lwp %s had stopped with extended " |
1457 | "status: no pending signal\n", | |
d86d4aaf | 1458 | target_pid_to_str (ptid_of (thread))); |
9b224c5e PA |
1459 | return 0; |
1460 | } | |
1461 | ||
2ea28649 | 1462 | signo = gdb_signal_from_host (WSTOPSIG (status)); |
9b224c5e PA |
1463 | |
1464 | if (program_signals_p && !program_signals[signo]) | |
1465 | { | |
1466 | if (debug_threads) | |
87ce2a04 | 1467 | debug_printf ("GPS: lwp %s had signal %s, but it is in nopass state\n", |
d86d4aaf | 1468 | target_pid_to_str (ptid_of (thread)), |
87ce2a04 | 1469 | gdb_signal_to_string (signo)); |
9b224c5e PA |
1470 | return 0; |
1471 | } | |
1472 | else if (!program_signals_p | |
1473 | /* If we have no way to know which signals GDB does not | |
1474 | want to have passed to the program, assume | |
1475 | SIGTRAP/SIGINT, which is GDB's default. */ | |
a493e3e2 | 1476 | && (signo == GDB_SIGNAL_TRAP || signo == GDB_SIGNAL_INT)) |
9b224c5e PA |
1477 | { |
1478 | if (debug_threads) | |
87ce2a04 DE |
1479 | debug_printf ("GPS: lwp %s had signal %s, " |
1480 | "but we don't know if we should pass it. " | |
1481 | "Default to not.\n", | |
d86d4aaf | 1482 | target_pid_to_str (ptid_of (thread)), |
87ce2a04 | 1483 | gdb_signal_to_string (signo)); |
9b224c5e PA |
1484 | return 0; |
1485 | } | |
1486 | else | |
1487 | { | |
1488 | if (debug_threads) | |
87ce2a04 | 1489 | debug_printf ("GPS: lwp %s has pending signal %s: delivering it.\n", |
d86d4aaf | 1490 | target_pid_to_str (ptid_of (thread)), |
87ce2a04 | 1491 | gdb_signal_to_string (signo)); |
9b224c5e PA |
1492 | |
1493 | return WSTOPSIG (status); | |
1494 | } | |
1495 | } | |
1496 | ||
ced2dffb PA |
1497 | /* Detach from LWP. */ |
1498 | ||
1499 | static void | |
1500 | linux_detach_one_lwp (struct lwp_info *lwp) | |
6ad8ae5c | 1501 | { |
ced2dffb | 1502 | struct thread_info *thread = get_lwp_thread (lwp); |
9b224c5e | 1503 | int sig; |
ced2dffb | 1504 | int lwpid; |
6ad8ae5c | 1505 | |
9b224c5e | 1506 | /* If there is a pending SIGSTOP, get rid of it. */ |
54a0b537 | 1507 | if (lwp->stop_expected) |
ae13219e | 1508 | { |
9b224c5e | 1509 | if (debug_threads) |
87ce2a04 | 1510 | debug_printf ("Sending SIGCONT to %s\n", |
d86d4aaf | 1511 | target_pid_to_str (ptid_of (thread))); |
9b224c5e | 1512 | |
d86d4aaf | 1513 | kill_lwp (lwpid_of (thread), SIGCONT); |
54a0b537 | 1514 | lwp->stop_expected = 0; |
ae13219e DJ |
1515 | } |
1516 | ||
9b224c5e PA |
1517 | /* Pass on any pending signal for this thread. */ |
1518 | sig = get_detach_signal (thread); | |
1519 | ||
ced2dffb PA |
1520 | /* Preparing to resume may try to write registers, and fail if the |
1521 | lwp is zombie. If that happens, ignore the error. We'll handle | |
1522 | it below, when detach fails with ESRCH. */ | |
1523 | TRY | |
1524 | { | |
1525 | /* Flush any pending changes to the process's registers. */ | |
1526 | regcache_invalidate_thread (thread); | |
1527 | ||
1528 | /* Finally, let it resume. */ | |
1529 | if (the_low_target.prepare_to_resume != NULL) | |
1530 | the_low_target.prepare_to_resume (lwp); | |
1531 | } | |
1532 | CATCH (ex, RETURN_MASK_ERROR) | |
1533 | { | |
1534 | if (!check_ptrace_stopped_lwp_gone (lwp)) | |
1535 | throw_exception (ex); | |
1536 | } | |
1537 | END_CATCH | |
1538 | ||
1539 | lwpid = lwpid_of (thread); | |
1540 | if (ptrace (PTRACE_DETACH, lwpid, (PTRACE_TYPE_ARG3) 0, | |
b8e1b30e | 1541 | (PTRACE_TYPE_ARG4) (long) sig) < 0) |
ced2dffb PA |
1542 | { |
1543 | int save_errno = errno; | |
1544 | ||
1545 | /* We know the thread exists, so ESRCH must mean the lwp is | |
1546 | zombie. This can happen if one of the already-detached | |
1547 | threads exits the whole thread group. In that case we're | |
1548 | still attached, and must reap the lwp. */ | |
1549 | if (save_errno == ESRCH) | |
1550 | { | |
1551 | int ret, status; | |
1552 | ||
1553 | ret = my_waitpid (lwpid, &status, __WALL); | |
1554 | if (ret == -1) | |
1555 | { | |
1556 | warning (_("Couldn't reap LWP %d while detaching: %s"), | |
1557 | lwpid, strerror (errno)); | |
1558 | } | |
1559 | else if (!WIFEXITED (status) && !WIFSIGNALED (status)) | |
1560 | { | |
1561 | warning (_("Reaping LWP %d while detaching " | |
1562 | "returned unexpected status 0x%x"), | |
1563 | lwpid, status); | |
1564 | } | |
1565 | } | |
1566 | else | |
1567 | { | |
1568 | error (_("Can't detach %s: %s"), | |
1569 | target_pid_to_str (ptid_of (thread)), | |
1570 | strerror (save_errno)); | |
1571 | } | |
1572 | } | |
1573 | else if (debug_threads) | |
1574 | { | |
1575 | debug_printf ("PTRACE_DETACH (%s, %s, 0) (OK)\n", | |
1576 | target_pid_to_str (ptid_of (thread)), | |
1577 | strsignal (sig)); | |
1578 | } | |
bd99dc85 PA |
1579 | |
1580 | delete_lwp (lwp); | |
ced2dffb PA |
1581 | } |
1582 | ||
1583 | /* Callback for find_inferior. Detaches from non-leader threads of a | |
1584 | given process. */ | |
1585 | ||
1586 | static int | |
1587 | linux_detach_lwp_callback (struct inferior_list_entry *entry, void *args) | |
1588 | { | |
1589 | struct thread_info *thread = (struct thread_info *) entry; | |
1590 | struct lwp_info *lwp = get_thread_lwp (thread); | |
1591 | int pid = *(int *) args; | |
1592 | int lwpid = lwpid_of (thread); | |
1593 | ||
1594 | /* Skip other processes. */ | |
1595 | if (ptid_get_pid (entry->id) != pid) | |
1596 | return 0; | |
1597 | ||
1598 | /* We don't actually detach from the thread group leader just yet. | |
1599 | If the thread group exits, we must reap the zombie clone lwps | |
1600 | before we're able to reap the leader. */ | |
1601 | if (ptid_get_pid (entry->id) == lwpid) | |
1602 | return 0; | |
1603 | ||
1604 | linux_detach_one_lwp (lwp); | |
95954743 | 1605 | return 0; |
6ad8ae5c DJ |
1606 | } |
1607 | ||
95954743 PA |
1608 | static int |
1609 | linux_detach (int pid) | |
1610 | { | |
1611 | struct process_info *process; | |
ced2dffb | 1612 | struct lwp_info *main_lwp; |
95954743 PA |
1613 | |
1614 | process = find_process_pid (pid); | |
1615 | if (process == NULL) | |
1616 | return -1; | |
1617 | ||
863d01bd PA |
1618 | /* As there's a step over already in progress, let it finish first, |
1619 | otherwise nesting a stabilize_threads operation on top gets real | |
1620 | messy. */ | |
1621 | complete_ongoing_step_over (); | |
1622 | ||
f9e39928 PA |
1623 | /* Stop all threads before detaching. First, ptrace requires that |
1624 | the thread is stopped to sucessfully detach. Second, thread_db | |
1625 | may need to uninstall thread event breakpoints from memory, which | |
1626 | only works with a stopped process anyway. */ | |
7984d532 | 1627 | stop_all_lwps (0, NULL); |
f9e39928 | 1628 | |
ca5c370d | 1629 | #ifdef USE_THREAD_DB |
8336d594 | 1630 | thread_db_detach (process); |
ca5c370d PA |
1631 | #endif |
1632 | ||
fa593d66 PA |
1633 | /* Stabilize threads (move out of jump pads). */ |
1634 | stabilize_threads (); | |
1635 | ||
ced2dffb PA |
1636 | /* Detach from the clone lwps first. If the thread group exits just |
1637 | while we're detaching, we must reap the clone lwps before we're | |
1638 | able to reap the leader. */ | |
1639 | find_inferior (&all_threads, linux_detach_lwp_callback, &pid); | |
1640 | ||
1641 | main_lwp = find_lwp_pid (pid_to_ptid (pid)); | |
1642 | linux_detach_one_lwp (main_lwp); | |
8336d594 PA |
1643 | |
1644 | the_target->mourn (process); | |
f9e39928 PA |
1645 | |
1646 | /* Since we presently can only stop all lwps of all processes, we | |
1647 | need to unstop lwps of other processes. */ | |
7984d532 | 1648 | unstop_all_lwps (0, NULL); |
f9e39928 PA |
1649 | return 0; |
1650 | } | |
1651 | ||
1652 | /* Remove all LWPs that belong to process PROC from the lwp list. */ | |
1653 | ||
1654 | static int | |
1655 | delete_lwp_callback (struct inferior_list_entry *entry, void *proc) | |
1656 | { | |
d86d4aaf DE |
1657 | struct thread_info *thread = (struct thread_info *) entry; |
1658 | struct lwp_info *lwp = get_thread_lwp (thread); | |
9a3c8263 | 1659 | struct process_info *process = (struct process_info *) proc; |
f9e39928 | 1660 | |
d86d4aaf | 1661 | if (pid_of (thread) == pid_of (process)) |
f9e39928 PA |
1662 | delete_lwp (lwp); |
1663 | ||
dd6953e1 | 1664 | return 0; |
6ad8ae5c DJ |
1665 | } |
1666 | ||
8336d594 PA |
1667 | static void |
1668 | linux_mourn (struct process_info *process) | |
1669 | { | |
1670 | struct process_info_private *priv; | |
1671 | ||
1672 | #ifdef USE_THREAD_DB | |
1673 | thread_db_mourn (process); | |
1674 | #endif | |
1675 | ||
d86d4aaf | 1676 | find_inferior (&all_threads, delete_lwp_callback, process); |
f9e39928 | 1677 | |
8336d594 | 1678 | /* Freeing all private data. */ |
fe978cb0 | 1679 | priv = process->priv; |
8336d594 PA |
1680 | free (priv->arch_private); |
1681 | free (priv); | |
fe978cb0 | 1682 | process->priv = NULL; |
505106cd PA |
1683 | |
1684 | remove_process (process); | |
8336d594 PA |
1685 | } |
1686 | ||
444d6139 | 1687 | static void |
95954743 | 1688 | linux_join (int pid) |
444d6139 | 1689 | { |
444d6139 PA |
1690 | int status, ret; |
1691 | ||
1692 | do { | |
95954743 | 1693 | ret = my_waitpid (pid, &status, 0); |
444d6139 PA |
1694 | if (WIFEXITED (status) || WIFSIGNALED (status)) |
1695 | break; | |
1696 | } while (ret != -1 || errno != ECHILD); | |
1697 | } | |
1698 | ||
6ad8ae5c | 1699 | /* Return nonzero if the given thread is still alive. */ |
0d62e5e8 | 1700 | static int |
95954743 | 1701 | linux_thread_alive (ptid_t ptid) |
0d62e5e8 | 1702 | { |
95954743 PA |
1703 | struct lwp_info *lwp = find_lwp_pid (ptid); |
1704 | ||
1705 | /* We assume we always know if a thread exits. If a whole process | |
1706 | exited but we still haven't been able to report it to GDB, we'll | |
1707 | hold on to the last lwp of the dead process. */ | |
1708 | if (lwp != NULL) | |
00db26fa | 1709 | return !lwp_is_marked_dead (lwp); |
0d62e5e8 DJ |
1710 | else |
1711 | return 0; | |
1712 | } | |
1713 | ||
582511be PA |
1714 | /* Return 1 if this lwp still has an interesting status pending. If |
1715 | not (e.g., it had stopped for a breakpoint that is gone), return | |
1716 | false. */ | |
1717 | ||
1718 | static int | |
1719 | thread_still_has_status_pending_p (struct thread_info *thread) | |
1720 | { | |
1721 | struct lwp_info *lp = get_thread_lwp (thread); | |
1722 | ||
1723 | if (!lp->status_pending_p) | |
1724 | return 0; | |
1725 | ||
582511be | 1726 | if (thread->last_resume_kind != resume_stop |
15c66dd6 PA |
1727 | && (lp->stop_reason == TARGET_STOPPED_BY_SW_BREAKPOINT |
1728 | || lp->stop_reason == TARGET_STOPPED_BY_HW_BREAKPOINT)) | |
582511be PA |
1729 | { |
1730 | struct thread_info *saved_thread; | |
1731 | CORE_ADDR pc; | |
1732 | int discard = 0; | |
1733 | ||
1734 | gdb_assert (lp->last_status != 0); | |
1735 | ||
1736 | pc = get_pc (lp); | |
1737 | ||
1738 | saved_thread = current_thread; | |
1739 | current_thread = thread; | |
1740 | ||
1741 | if (pc != lp->stop_pc) | |
1742 | { | |
1743 | if (debug_threads) | |
1744 | debug_printf ("PC of %ld changed\n", | |
1745 | lwpid_of (thread)); | |
1746 | discard = 1; | |
1747 | } | |
3e572f71 PA |
1748 | |
1749 | #if !USE_SIGTRAP_SIGINFO | |
15c66dd6 | 1750 | else if (lp->stop_reason == TARGET_STOPPED_BY_SW_BREAKPOINT |
582511be PA |
1751 | && !(*the_low_target.breakpoint_at) (pc)) |
1752 | { | |
1753 | if (debug_threads) | |
1754 | debug_printf ("previous SW breakpoint of %ld gone\n", | |
1755 | lwpid_of (thread)); | |
1756 | discard = 1; | |
1757 | } | |
15c66dd6 | 1758 | else if (lp->stop_reason == TARGET_STOPPED_BY_HW_BREAKPOINT |
582511be PA |
1759 | && !hardware_breakpoint_inserted_here (pc)) |
1760 | { | |
1761 | if (debug_threads) | |
1762 | debug_printf ("previous HW breakpoint of %ld gone\n", | |
1763 | lwpid_of (thread)); | |
1764 | discard = 1; | |
1765 | } | |
3e572f71 | 1766 | #endif |
582511be PA |
1767 | |
1768 | current_thread = saved_thread; | |
1769 | ||
1770 | if (discard) | |
1771 | { | |
1772 | if (debug_threads) | |
1773 | debug_printf ("discarding pending breakpoint status\n"); | |
1774 | lp->status_pending_p = 0; | |
1775 | return 0; | |
1776 | } | |
1777 | } | |
1778 | ||
1779 | return 1; | |
1780 | } | |
1781 | ||
a681f9c9 PA |
1782 | /* Returns true if LWP is resumed from the client's perspective. */ |
1783 | ||
1784 | static int | |
1785 | lwp_resumed (struct lwp_info *lwp) | |
1786 | { | |
1787 | struct thread_info *thread = get_lwp_thread (lwp); | |
1788 | ||
1789 | if (thread->last_resume_kind != resume_stop) | |
1790 | return 1; | |
1791 | ||
1792 | /* Did gdb send us a `vCont;t', but we haven't reported the | |
1793 | corresponding stop to gdb yet? If so, the thread is still | |
1794 | resumed/running from gdb's perspective. */ | |
1795 | if (thread->last_resume_kind == resume_stop | |
1796 | && thread->last_status.kind == TARGET_WAITKIND_IGNORE) | |
1797 | return 1; | |
1798 | ||
1799 | return 0; | |
1800 | } | |
1801 | ||
6bf5e0ba | 1802 | /* Return 1 if this lwp has an interesting status pending. */ |
611cb4a5 | 1803 | static int |
d50171e4 | 1804 | status_pending_p_callback (struct inferior_list_entry *entry, void *arg) |
0d62e5e8 | 1805 | { |
d86d4aaf | 1806 | struct thread_info *thread = (struct thread_info *) entry; |
582511be | 1807 | struct lwp_info *lp = get_thread_lwp (thread); |
95954743 PA |
1808 | ptid_t ptid = * (ptid_t *) arg; |
1809 | ||
1810 | /* Check if we're only interested in events from a specific process | |
afa8d396 PA |
1811 | or a specific LWP. */ |
1812 | if (!ptid_match (ptid_of (thread), ptid)) | |
95954743 | 1813 | return 0; |
0d62e5e8 | 1814 | |
a681f9c9 PA |
1815 | if (!lwp_resumed (lp)) |
1816 | return 0; | |
1817 | ||
582511be PA |
1818 | if (lp->status_pending_p |
1819 | && !thread_still_has_status_pending_p (thread)) | |
1820 | { | |
1821 | linux_resume_one_lwp (lp, lp->stepping, GDB_SIGNAL_0, NULL); | |
1822 | return 0; | |
1823 | } | |
0d62e5e8 | 1824 | |
582511be | 1825 | return lp->status_pending_p; |
0d62e5e8 DJ |
1826 | } |
1827 | ||
95954743 PA |
1828 | static int |
1829 | same_lwp (struct inferior_list_entry *entry, void *data) | |
1830 | { | |
1831 | ptid_t ptid = *(ptid_t *) data; | |
1832 | int lwp; | |
1833 | ||
1834 | if (ptid_get_lwp (ptid) != 0) | |
1835 | lwp = ptid_get_lwp (ptid); | |
1836 | else | |
1837 | lwp = ptid_get_pid (ptid); | |
1838 | ||
1839 | if (ptid_get_lwp (entry->id) == lwp) | |
1840 | return 1; | |
1841 | ||
1842 | return 0; | |
1843 | } | |
1844 | ||
1845 | struct lwp_info * | |
1846 | find_lwp_pid (ptid_t ptid) | |
1847 | { | |
d86d4aaf DE |
1848 | struct inferior_list_entry *thread |
1849 | = find_inferior (&all_threads, same_lwp, &ptid); | |
1850 | ||
1851 | if (thread == NULL) | |
1852 | return NULL; | |
1853 | ||
1854 | return get_thread_lwp ((struct thread_info *) thread); | |
95954743 PA |
1855 | } |
1856 | ||
fa96cb38 | 1857 | /* Return the number of known LWPs in the tgid given by PID. */ |
0d62e5e8 | 1858 | |
fa96cb38 PA |
1859 | static int |
1860 | num_lwps (int pid) | |
1861 | { | |
1862 | struct inferior_list_entry *inf, *tmp; | |
1863 | int count = 0; | |
0d62e5e8 | 1864 | |
fa96cb38 | 1865 | ALL_INFERIORS (&all_threads, inf, tmp) |
24a09b5f | 1866 | { |
fa96cb38 PA |
1867 | if (ptid_get_pid (inf->id) == pid) |
1868 | count++; | |
24a09b5f | 1869 | } |
3aee8918 | 1870 | |
fa96cb38 PA |
1871 | return count; |
1872 | } | |
d61ddec4 | 1873 | |
6d4ee8c6 GB |
1874 | /* The arguments passed to iterate_over_lwps. */ |
1875 | ||
1876 | struct iterate_over_lwps_args | |
1877 | { | |
1878 | /* The FILTER argument passed to iterate_over_lwps. */ | |
1879 | ptid_t filter; | |
1880 | ||
1881 | /* The CALLBACK argument passed to iterate_over_lwps. */ | |
1882 | iterate_over_lwps_ftype *callback; | |
1883 | ||
1884 | /* The DATA argument passed to iterate_over_lwps. */ | |
1885 | void *data; | |
1886 | }; | |
1887 | ||
1888 | /* Callback for find_inferior used by iterate_over_lwps to filter | |
1889 | calls to the callback supplied to that function. Returning a | |
1890 | nonzero value causes find_inferiors to stop iterating and return | |
1891 | the current inferior_list_entry. Returning zero indicates that | |
1892 | find_inferiors should continue iterating. */ | |
1893 | ||
1894 | static int | |
1895 | iterate_over_lwps_filter (struct inferior_list_entry *entry, void *args_p) | |
1896 | { | |
1897 | struct iterate_over_lwps_args *args | |
1898 | = (struct iterate_over_lwps_args *) args_p; | |
1899 | ||
1900 | if (ptid_match (entry->id, args->filter)) | |
1901 | { | |
1902 | struct thread_info *thr = (struct thread_info *) entry; | |
1903 | struct lwp_info *lwp = get_thread_lwp (thr); | |
1904 | ||
1905 | return (*args->callback) (lwp, args->data); | |
1906 | } | |
1907 | ||
1908 | return 0; | |
1909 | } | |
1910 | ||
1911 | /* See nat/linux-nat.h. */ | |
1912 | ||
1913 | struct lwp_info * | |
1914 | iterate_over_lwps (ptid_t filter, | |
1915 | iterate_over_lwps_ftype callback, | |
1916 | void *data) | |
1917 | { | |
1918 | struct iterate_over_lwps_args args = {filter, callback, data}; | |
1919 | struct inferior_list_entry *entry; | |
1920 | ||
1921 | entry = find_inferior (&all_threads, iterate_over_lwps_filter, &args); | |
1922 | if (entry == NULL) | |
1923 | return NULL; | |
1924 | ||
1925 | return get_thread_lwp ((struct thread_info *) entry); | |
1926 | } | |
1927 | ||
fa96cb38 PA |
1928 | /* Detect zombie thread group leaders, and "exit" them. We can't reap |
1929 | their exits until all other threads in the group have exited. */ | |
c3adc08c | 1930 | |
fa96cb38 PA |
1931 | static void |
1932 | check_zombie_leaders (void) | |
1933 | { | |
1934 | struct process_info *proc, *tmp; | |
c3adc08c | 1935 | |
fa96cb38 | 1936 | ALL_PROCESSES (proc, tmp) |
c3adc08c | 1937 | { |
fa96cb38 PA |
1938 | pid_t leader_pid = pid_of (proc); |
1939 | struct lwp_info *leader_lp; | |
c3adc08c | 1940 | |
fa96cb38 | 1941 | leader_lp = find_lwp_pid (pid_to_ptid (leader_pid)); |
c3adc08c | 1942 | |
fa96cb38 PA |
1943 | if (debug_threads) |
1944 | debug_printf ("leader_pid=%d, leader_lp!=NULL=%d, " | |
1945 | "num_lwps=%d, zombie=%d\n", | |
1946 | leader_pid, leader_lp!= NULL, num_lwps (leader_pid), | |
1947 | linux_proc_pid_is_zombie (leader_pid)); | |
1948 | ||
94585166 | 1949 | if (leader_lp != NULL && !leader_lp->stopped |
fa96cb38 PA |
1950 | /* Check if there are other threads in the group, as we may |
1951 | have raced with the inferior simply exiting. */ | |
1952 | && !last_thread_of_process_p (leader_pid) | |
1953 | && linux_proc_pid_is_zombie (leader_pid)) | |
1954 | { | |
1955 | /* A leader zombie can mean one of two things: | |
1956 | ||
1957 | - It exited, and there's an exit status pending | |
1958 | available, or only the leader exited (not the whole | |
1959 | program). In the latter case, we can't waitpid the | |
1960 | leader's exit status until all other threads are gone. | |
1961 | ||
1962 | - There are 3 or more threads in the group, and a thread | |
1963 | other than the leader exec'd. On an exec, the Linux | |
1964 | kernel destroys all other threads (except the execing | |
1965 | one) in the thread group, and resets the execing thread's | |
1966 | tid to the tgid. No exit notification is sent for the | |
1967 | execing thread -- from the ptracer's perspective, it | |
1968 | appears as though the execing thread just vanishes. | |
1969 | Until we reap all other threads except the leader and the | |
1970 | execing thread, the leader will be zombie, and the | |
1971 | execing thread will be in `D (disc sleep)'. As soon as | |
1972 | all other threads are reaped, the execing thread changes | |
1973 | it's tid to the tgid, and the previous (zombie) leader | |
1974 | vanishes, giving place to the "new" leader. We could try | |
1975 | distinguishing the exit and exec cases, by waiting once | |
1976 | more, and seeing if something comes out, but it doesn't | |
1977 | sound useful. The previous leader _does_ go away, and | |
1978 | we'll re-add the new one once we see the exec event | |
1979 | (which is just the same as what would happen if the | |
1980 | previous leader did exit voluntarily before some other | |
1981 | thread execs). */ | |
c3adc08c | 1982 | |
fa96cb38 PA |
1983 | if (debug_threads) |
1984 | fprintf (stderr, | |
1985 | "CZL: Thread group leader %d zombie " | |
1986 | "(it exited, or another thread execd).\n", | |
1987 | leader_pid); | |
c3adc08c | 1988 | |
fa96cb38 | 1989 | delete_lwp (leader_lp); |
c3adc08c PA |
1990 | } |
1991 | } | |
fa96cb38 | 1992 | } |
c3adc08c | 1993 | |
fa96cb38 PA |
1994 | /* Callback for `find_inferior'. Returns the first LWP that is not |
1995 | stopped. ARG is a PTID filter. */ | |
d50171e4 | 1996 | |
fa96cb38 PA |
1997 | static int |
1998 | not_stopped_callback (struct inferior_list_entry *entry, void *arg) | |
1999 | { | |
2000 | struct thread_info *thr = (struct thread_info *) entry; | |
2001 | struct lwp_info *lwp; | |
2002 | ptid_t filter = *(ptid_t *) arg; | |
47c0c975 | 2003 | |
fa96cb38 PA |
2004 | if (!ptid_match (ptid_of (thr), filter)) |
2005 | return 0; | |
bd99dc85 | 2006 | |
fa96cb38 PA |
2007 | lwp = get_thread_lwp (thr); |
2008 | if (!lwp->stopped) | |
2009 | return 1; | |
2010 | ||
2011 | return 0; | |
0d62e5e8 | 2012 | } |
611cb4a5 | 2013 | |
863d01bd PA |
2014 | /* Increment LWP's suspend count. */ |
2015 | ||
2016 | static void | |
2017 | lwp_suspended_inc (struct lwp_info *lwp) | |
2018 | { | |
2019 | lwp->suspended++; | |
2020 | ||
2021 | if (debug_threads && lwp->suspended > 4) | |
2022 | { | |
2023 | struct thread_info *thread = get_lwp_thread (lwp); | |
2024 | ||
2025 | debug_printf ("LWP %ld has a suspiciously high suspend count," | |
2026 | " suspended=%d\n", lwpid_of (thread), lwp->suspended); | |
2027 | } | |
2028 | } | |
2029 | ||
2030 | /* Decrement LWP's suspend count. */ | |
2031 | ||
2032 | static void | |
2033 | lwp_suspended_decr (struct lwp_info *lwp) | |
2034 | { | |
2035 | lwp->suspended--; | |
2036 | ||
2037 | if (lwp->suspended < 0) | |
2038 | { | |
2039 | struct thread_info *thread = get_lwp_thread (lwp); | |
2040 | ||
2041 | internal_error (__FILE__, __LINE__, | |
2042 | "unsuspend LWP %ld, suspended=%d\n", lwpid_of (thread), | |
2043 | lwp->suspended); | |
2044 | } | |
2045 | } | |
2046 | ||
219f2f23 PA |
2047 | /* This function should only be called if the LWP got a SIGTRAP. |
2048 | ||
2049 | Handle any tracepoint steps or hits. Return true if a tracepoint | |
2050 | event was handled, 0 otherwise. */ | |
2051 | ||
2052 | static int | |
2053 | handle_tracepoints (struct lwp_info *lwp) | |
2054 | { | |
2055 | struct thread_info *tinfo = get_lwp_thread (lwp); | |
2056 | int tpoint_related_event = 0; | |
2057 | ||
582511be PA |
2058 | gdb_assert (lwp->suspended == 0); |
2059 | ||
7984d532 PA |
2060 | /* If this tracepoint hit causes a tracing stop, we'll immediately |
2061 | uninsert tracepoints. To do this, we temporarily pause all | |
2062 | threads, unpatch away, and then unpause threads. We need to make | |
2063 | sure the unpausing doesn't resume LWP too. */ | |
863d01bd | 2064 | lwp_suspended_inc (lwp); |
7984d532 | 2065 | |
219f2f23 PA |
2066 | /* And we need to be sure that any all-threads-stopping doesn't try |
2067 | to move threads out of the jump pads, as it could deadlock the | |
2068 | inferior (LWP could be in the jump pad, maybe even holding the | |
2069 | lock.) */ | |
2070 | ||
2071 | /* Do any necessary step collect actions. */ | |
2072 | tpoint_related_event |= tracepoint_finished_step (tinfo, lwp->stop_pc); | |
2073 | ||
fa593d66 PA |
2074 | tpoint_related_event |= handle_tracepoint_bkpts (tinfo, lwp->stop_pc); |
2075 | ||
219f2f23 PA |
2076 | /* See if we just hit a tracepoint and do its main collect |
2077 | actions. */ | |
2078 | tpoint_related_event |= tracepoint_was_hit (tinfo, lwp->stop_pc); | |
2079 | ||
863d01bd | 2080 | lwp_suspended_decr (lwp); |
7984d532 PA |
2081 | |
2082 | gdb_assert (lwp->suspended == 0); | |
fa593d66 | 2083 | gdb_assert (!stabilizing_threads || lwp->collecting_fast_tracepoint); |
7984d532 | 2084 | |
219f2f23 PA |
2085 | if (tpoint_related_event) |
2086 | { | |
2087 | if (debug_threads) | |
87ce2a04 | 2088 | debug_printf ("got a tracepoint event\n"); |
219f2f23 PA |
2089 | return 1; |
2090 | } | |
2091 | ||
2092 | return 0; | |
2093 | } | |
2094 | ||
fa593d66 PA |
2095 | /* Convenience wrapper. Returns true if LWP is presently collecting a |
2096 | fast tracepoint. */ | |
2097 | ||
2098 | static int | |
2099 | linux_fast_tracepoint_collecting (struct lwp_info *lwp, | |
2100 | struct fast_tpoint_collect_status *status) | |
2101 | { | |
2102 | CORE_ADDR thread_area; | |
d86d4aaf | 2103 | struct thread_info *thread = get_lwp_thread (lwp); |
fa593d66 PA |
2104 | |
2105 | if (the_low_target.get_thread_area == NULL) | |
2106 | return 0; | |
2107 | ||
2108 | /* Get the thread area address. This is used to recognize which | |
2109 | thread is which when tracing with the in-process agent library. | |
2110 | We don't read anything from the address, and treat it as opaque; | |
2111 | it's the address itself that we assume is unique per-thread. */ | |
d86d4aaf | 2112 | if ((*the_low_target.get_thread_area) (lwpid_of (thread), &thread_area) == -1) |
fa593d66 PA |
2113 | return 0; |
2114 | ||
2115 | return fast_tracepoint_collecting (thread_area, lwp->stop_pc, status); | |
2116 | } | |
2117 | ||
2118 | /* The reason we resume in the caller, is because we want to be able | |
2119 | to pass lwp->status_pending as WSTAT, and we need to clear | |
2120 | status_pending_p before resuming, otherwise, linux_resume_one_lwp | |
2121 | refuses to resume. */ | |
2122 | ||
2123 | static int | |
2124 | maybe_move_out_of_jump_pad (struct lwp_info *lwp, int *wstat) | |
2125 | { | |
0bfdf32f | 2126 | struct thread_info *saved_thread; |
fa593d66 | 2127 | |
0bfdf32f GB |
2128 | saved_thread = current_thread; |
2129 | current_thread = get_lwp_thread (lwp); | |
fa593d66 PA |
2130 | |
2131 | if ((wstat == NULL | |
2132 | || (WIFSTOPPED (*wstat) && WSTOPSIG (*wstat) != SIGTRAP)) | |
2133 | && supports_fast_tracepoints () | |
58b4daa5 | 2134 | && agent_loaded_p ()) |
fa593d66 PA |
2135 | { |
2136 | struct fast_tpoint_collect_status status; | |
2137 | int r; | |
2138 | ||
2139 | if (debug_threads) | |
87ce2a04 DE |
2140 | debug_printf ("Checking whether LWP %ld needs to move out of the " |
2141 | "jump pad.\n", | |
0bfdf32f | 2142 | lwpid_of (current_thread)); |
fa593d66 PA |
2143 | |
2144 | r = linux_fast_tracepoint_collecting (lwp, &status); | |
2145 | ||
2146 | if (wstat == NULL | |
2147 | || (WSTOPSIG (*wstat) != SIGILL | |
2148 | && WSTOPSIG (*wstat) != SIGFPE | |
2149 | && WSTOPSIG (*wstat) != SIGSEGV | |
2150 | && WSTOPSIG (*wstat) != SIGBUS)) | |
2151 | { | |
2152 | lwp->collecting_fast_tracepoint = r; | |
2153 | ||
2154 | if (r != 0) | |
2155 | { | |
2156 | if (r == 1 && lwp->exit_jump_pad_bkpt == NULL) | |
2157 | { | |
2158 | /* Haven't executed the original instruction yet. | |
2159 | Set breakpoint there, and wait till it's hit, | |
2160 | then single-step until exiting the jump pad. */ | |
2161 | lwp->exit_jump_pad_bkpt | |
2162 | = set_breakpoint_at (status.adjusted_insn_addr, NULL); | |
2163 | } | |
2164 | ||
2165 | if (debug_threads) | |
87ce2a04 DE |
2166 | debug_printf ("Checking whether LWP %ld needs to move out of " |
2167 | "the jump pad...it does\n", | |
0bfdf32f GB |
2168 | lwpid_of (current_thread)); |
2169 | current_thread = saved_thread; | |
fa593d66 PA |
2170 | |
2171 | return 1; | |
2172 | } | |
2173 | } | |
2174 | else | |
2175 | { | |
2176 | /* If we get a synchronous signal while collecting, *and* | |
2177 | while executing the (relocated) original instruction, | |
2178 | reset the PC to point at the tpoint address, before | |
2179 | reporting to GDB. Otherwise, it's an IPA lib bug: just | |
2180 | report the signal to GDB, and pray for the best. */ | |
2181 | ||
2182 | lwp->collecting_fast_tracepoint = 0; | |
2183 | ||
2184 | if (r != 0 | |
2185 | && (status.adjusted_insn_addr <= lwp->stop_pc | |
2186 | && lwp->stop_pc < status.adjusted_insn_addr_end)) | |
2187 | { | |
2188 | siginfo_t info; | |
2189 | struct regcache *regcache; | |
2190 | ||
2191 | /* The si_addr on a few signals references the address | |
2192 | of the faulting instruction. Adjust that as | |
2193 | well. */ | |
2194 | if ((WSTOPSIG (*wstat) == SIGILL | |
2195 | || WSTOPSIG (*wstat) == SIGFPE | |
2196 | || WSTOPSIG (*wstat) == SIGBUS | |
2197 | || WSTOPSIG (*wstat) == SIGSEGV) | |
0bfdf32f | 2198 | && ptrace (PTRACE_GETSIGINFO, lwpid_of (current_thread), |
b8e1b30e | 2199 | (PTRACE_TYPE_ARG3) 0, &info) == 0 |
fa593d66 PA |
2200 | /* Final check just to make sure we don't clobber |
2201 | the siginfo of non-kernel-sent signals. */ | |
2202 | && (uintptr_t) info.si_addr == lwp->stop_pc) | |
2203 | { | |
2204 | info.si_addr = (void *) (uintptr_t) status.tpoint_addr; | |
0bfdf32f | 2205 | ptrace (PTRACE_SETSIGINFO, lwpid_of (current_thread), |
b8e1b30e | 2206 | (PTRACE_TYPE_ARG3) 0, &info); |
fa593d66 PA |
2207 | } |
2208 | ||
0bfdf32f | 2209 | regcache = get_thread_regcache (current_thread, 1); |
fa593d66 PA |
2210 | (*the_low_target.set_pc) (regcache, status.tpoint_addr); |
2211 | lwp->stop_pc = status.tpoint_addr; | |
2212 | ||
2213 | /* Cancel any fast tracepoint lock this thread was | |
2214 | holding. */ | |
2215 | force_unlock_trace_buffer (); | |
2216 | } | |
2217 | ||
2218 | if (lwp->exit_jump_pad_bkpt != NULL) | |
2219 | { | |
2220 | if (debug_threads) | |
87ce2a04 DE |
2221 | debug_printf ("Cancelling fast exit-jump-pad: removing bkpt. " |
2222 | "stopping all threads momentarily.\n"); | |
fa593d66 PA |
2223 | |
2224 | stop_all_lwps (1, lwp); | |
fa593d66 PA |
2225 | |
2226 | delete_breakpoint (lwp->exit_jump_pad_bkpt); | |
2227 | lwp->exit_jump_pad_bkpt = NULL; | |
2228 | ||
2229 | unstop_all_lwps (1, lwp); | |
2230 | ||
2231 | gdb_assert (lwp->suspended >= 0); | |
2232 | } | |
2233 | } | |
2234 | } | |
2235 | ||
2236 | if (debug_threads) | |
87ce2a04 DE |
2237 | debug_printf ("Checking whether LWP %ld needs to move out of the " |
2238 | "jump pad...no\n", | |
0bfdf32f | 2239 | lwpid_of (current_thread)); |
0cccb683 | 2240 | |
0bfdf32f | 2241 | current_thread = saved_thread; |
fa593d66 PA |
2242 | return 0; |
2243 | } | |
2244 | ||
2245 | /* Enqueue one signal in the "signals to report later when out of the | |
2246 | jump pad" list. */ | |
2247 | ||
2248 | static void | |
2249 | enqueue_one_deferred_signal (struct lwp_info *lwp, int *wstat) | |
2250 | { | |
2251 | struct pending_signals *p_sig; | |
d86d4aaf | 2252 | struct thread_info *thread = get_lwp_thread (lwp); |
fa593d66 PA |
2253 | |
2254 | if (debug_threads) | |
87ce2a04 | 2255 | debug_printf ("Deferring signal %d for LWP %ld.\n", |
d86d4aaf | 2256 | WSTOPSIG (*wstat), lwpid_of (thread)); |
fa593d66 PA |
2257 | |
2258 | if (debug_threads) | |
2259 | { | |
2260 | struct pending_signals *sig; | |
2261 | ||
2262 | for (sig = lwp->pending_signals_to_report; | |
2263 | sig != NULL; | |
2264 | sig = sig->prev) | |
87ce2a04 DE |
2265 | debug_printf (" Already queued %d\n", |
2266 | sig->signal); | |
fa593d66 | 2267 | |
87ce2a04 | 2268 | debug_printf (" (no more currently queued signals)\n"); |
fa593d66 PA |
2269 | } |
2270 | ||
1a981360 PA |
2271 | /* Don't enqueue non-RT signals if they are already in the deferred |
2272 | queue. (SIGSTOP being the easiest signal to see ending up here | |
2273 | twice) */ | |
2274 | if (WSTOPSIG (*wstat) < __SIGRTMIN) | |
2275 | { | |
2276 | struct pending_signals *sig; | |
2277 | ||
2278 | for (sig = lwp->pending_signals_to_report; | |
2279 | sig != NULL; | |
2280 | sig = sig->prev) | |
2281 | { | |
2282 | if (sig->signal == WSTOPSIG (*wstat)) | |
2283 | { | |
2284 | if (debug_threads) | |
87ce2a04 DE |
2285 | debug_printf ("Not requeuing already queued non-RT signal %d" |
2286 | " for LWP %ld\n", | |
2287 | sig->signal, | |
d86d4aaf | 2288 | lwpid_of (thread)); |
1a981360 PA |
2289 | return; |
2290 | } | |
2291 | } | |
2292 | } | |
2293 | ||
8d749320 | 2294 | p_sig = XCNEW (struct pending_signals); |
fa593d66 PA |
2295 | p_sig->prev = lwp->pending_signals_to_report; |
2296 | p_sig->signal = WSTOPSIG (*wstat); | |
8d749320 | 2297 | |
d86d4aaf | 2298 | ptrace (PTRACE_GETSIGINFO, lwpid_of (thread), (PTRACE_TYPE_ARG3) 0, |
56f7af9c | 2299 | &p_sig->info); |
fa593d66 PA |
2300 | |
2301 | lwp->pending_signals_to_report = p_sig; | |
2302 | } | |
2303 | ||
2304 | /* Dequeue one signal from the "signals to report later when out of | |
2305 | the jump pad" list. */ | |
2306 | ||
2307 | static int | |
2308 | dequeue_one_deferred_signal (struct lwp_info *lwp, int *wstat) | |
2309 | { | |
d86d4aaf DE |
2310 | struct thread_info *thread = get_lwp_thread (lwp); |
2311 | ||
fa593d66 PA |
2312 | if (lwp->pending_signals_to_report != NULL) |
2313 | { | |
2314 | struct pending_signals **p_sig; | |
2315 | ||
2316 | p_sig = &lwp->pending_signals_to_report; | |
2317 | while ((*p_sig)->prev != NULL) | |
2318 | p_sig = &(*p_sig)->prev; | |
2319 | ||
2320 | *wstat = W_STOPCODE ((*p_sig)->signal); | |
2321 | if ((*p_sig)->info.si_signo != 0) | |
d86d4aaf | 2322 | ptrace (PTRACE_SETSIGINFO, lwpid_of (thread), (PTRACE_TYPE_ARG3) 0, |
56f7af9c | 2323 | &(*p_sig)->info); |
fa593d66 PA |
2324 | free (*p_sig); |
2325 | *p_sig = NULL; | |
2326 | ||
2327 | if (debug_threads) | |
87ce2a04 | 2328 | debug_printf ("Reporting deferred signal %d for LWP %ld.\n", |
d86d4aaf | 2329 | WSTOPSIG (*wstat), lwpid_of (thread)); |
fa593d66 PA |
2330 | |
2331 | if (debug_threads) | |
2332 | { | |
2333 | struct pending_signals *sig; | |
2334 | ||
2335 | for (sig = lwp->pending_signals_to_report; | |
2336 | sig != NULL; | |
2337 | sig = sig->prev) | |
87ce2a04 DE |
2338 | debug_printf (" Still queued %d\n", |
2339 | sig->signal); | |
fa593d66 | 2340 | |
87ce2a04 | 2341 | debug_printf (" (no more queued signals)\n"); |
fa593d66 PA |
2342 | } |
2343 | ||
2344 | return 1; | |
2345 | } | |
2346 | ||
2347 | return 0; | |
2348 | } | |
2349 | ||
582511be PA |
2350 | /* Fetch the possibly triggered data watchpoint info and store it in |
2351 | CHILD. | |
d50171e4 | 2352 | |
582511be PA |
2353 | On some archs, like x86, that use debug registers to set |
2354 | watchpoints, it's possible that the way to know which watched | |
2355 | address trapped, is to check the register that is used to select | |
2356 | which address to watch. Problem is, between setting the watchpoint | |
2357 | and reading back which data address trapped, the user may change | |
2358 | the set of watchpoints, and, as a consequence, GDB changes the | |
2359 | debug registers in the inferior. To avoid reading back a stale | |
2360 | stopped-data-address when that happens, we cache in LP the fact | |
2361 | that a watchpoint trapped, and the corresponding data address, as | |
2362 | soon as we see CHILD stop with a SIGTRAP. If GDB changes the debug | |
2363 | registers meanwhile, we have the cached data we can rely on. */ | |
d50171e4 | 2364 | |
582511be PA |
2365 | static int |
2366 | check_stopped_by_watchpoint (struct lwp_info *child) | |
2367 | { | |
2368 | if (the_low_target.stopped_by_watchpoint != NULL) | |
d50171e4 | 2369 | { |
582511be | 2370 | struct thread_info *saved_thread; |
d50171e4 | 2371 | |
582511be PA |
2372 | saved_thread = current_thread; |
2373 | current_thread = get_lwp_thread (child); | |
2374 | ||
2375 | if (the_low_target.stopped_by_watchpoint ()) | |
d50171e4 | 2376 | { |
15c66dd6 | 2377 | child->stop_reason = TARGET_STOPPED_BY_WATCHPOINT; |
582511be PA |
2378 | |
2379 | if (the_low_target.stopped_data_address != NULL) | |
2380 | child->stopped_data_address | |
2381 | = the_low_target.stopped_data_address (); | |
2382 | else | |
2383 | child->stopped_data_address = 0; | |
d50171e4 PA |
2384 | } |
2385 | ||
0bfdf32f | 2386 | current_thread = saved_thread; |
d50171e4 PA |
2387 | } |
2388 | ||
15c66dd6 | 2389 | return child->stop_reason == TARGET_STOPPED_BY_WATCHPOINT; |
c4d9ceb6 YQ |
2390 | } |
2391 | ||
de0d863e DB |
2392 | /* Return the ptrace options that we want to try to enable. */ |
2393 | ||
2394 | static int | |
2395 | linux_low_ptrace_options (int attached) | |
2396 | { | |
2397 | int options = 0; | |
2398 | ||
2399 | if (!attached) | |
2400 | options |= PTRACE_O_EXITKILL; | |
2401 | ||
2402 | if (report_fork_events) | |
2403 | options |= PTRACE_O_TRACEFORK; | |
2404 | ||
c269dbdb DB |
2405 | if (report_vfork_events) |
2406 | options |= (PTRACE_O_TRACEVFORK | PTRACE_O_TRACEVFORKDONE); | |
2407 | ||
94585166 DB |
2408 | if (report_exec_events) |
2409 | options |= PTRACE_O_TRACEEXEC; | |
2410 | ||
82075af2 JS |
2411 | options |= PTRACE_O_TRACESYSGOOD; |
2412 | ||
de0d863e DB |
2413 | return options; |
2414 | } | |
2415 | ||
fa96cb38 PA |
2416 | /* Do low-level handling of the event, and check if we should go on |
2417 | and pass it to caller code. Return the affected lwp if we are, or | |
2418 | NULL otherwise. */ | |
2419 | ||
2420 | static struct lwp_info * | |
582511be | 2421 | linux_low_filter_event (int lwpid, int wstat) |
fa96cb38 PA |
2422 | { |
2423 | struct lwp_info *child; | |
2424 | struct thread_info *thread; | |
582511be | 2425 | int have_stop_pc = 0; |
fa96cb38 PA |
2426 | |
2427 | child = find_lwp_pid (pid_to_ptid (lwpid)); | |
2428 | ||
94585166 DB |
2429 | /* Check for stop events reported by a process we didn't already |
2430 | know about - anything not already in our LWP list. | |
2431 | ||
2432 | If we're expecting to receive stopped processes after | |
2433 | fork, vfork, and clone events, then we'll just add the | |
2434 | new one to our list and go back to waiting for the event | |
2435 | to be reported - the stopped process might be returned | |
2436 | from waitpid before or after the event is. | |
2437 | ||
2438 | But note the case of a non-leader thread exec'ing after the | |
2439 | leader having exited, and gone from our lists (because | |
2440 | check_zombie_leaders deleted it). The non-leader thread | |
2441 | changes its tid to the tgid. */ | |
2442 | ||
2443 | if (WIFSTOPPED (wstat) && child == NULL && WSTOPSIG (wstat) == SIGTRAP | |
2444 | && linux_ptrace_get_extended_event (wstat) == PTRACE_EVENT_EXEC) | |
2445 | { | |
2446 | ptid_t child_ptid; | |
2447 | ||
2448 | /* A multi-thread exec after we had seen the leader exiting. */ | |
2449 | if (debug_threads) | |
2450 | { | |
2451 | debug_printf ("LLW: Re-adding thread group leader LWP %d" | |
2452 | "after exec.\n", lwpid); | |
2453 | } | |
2454 | ||
2455 | child_ptid = ptid_build (lwpid, lwpid, 0); | |
2456 | child = add_lwp (child_ptid); | |
2457 | child->stopped = 1; | |
2458 | current_thread = child->thread; | |
2459 | } | |
2460 | ||
fa96cb38 PA |
2461 | /* If we didn't find a process, one of two things presumably happened: |
2462 | - A process we started and then detached from has exited. Ignore it. | |
2463 | - A process we are controlling has forked and the new child's stop | |
2464 | was reported to us by the kernel. Save its PID. */ | |
2465 | if (child == NULL && WIFSTOPPED (wstat)) | |
2466 | { | |
2467 | add_to_pid_list (&stopped_pids, lwpid, wstat); | |
2468 | return NULL; | |
2469 | } | |
2470 | else if (child == NULL) | |
2471 | return NULL; | |
2472 | ||
2473 | thread = get_lwp_thread (child); | |
2474 | ||
2475 | child->stopped = 1; | |
2476 | ||
2477 | child->last_status = wstat; | |
2478 | ||
582511be PA |
2479 | /* Check if the thread has exited. */ |
2480 | if ((WIFEXITED (wstat) || WIFSIGNALED (wstat))) | |
2481 | { | |
2482 | if (debug_threads) | |
2483 | debug_printf ("LLFE: %d exited.\n", lwpid); | |
f50bf8e5 YQ |
2484 | |
2485 | if (finish_step_over (child)) | |
2486 | { | |
2487 | /* Unsuspend all other LWPs, and set them back running again. */ | |
2488 | unsuspend_all_lwps (child); | |
2489 | } | |
2490 | ||
65706a29 PA |
2491 | /* If there is at least one more LWP, then the exit signal was |
2492 | not the end of the debugged application and should be | |
2493 | ignored, unless GDB wants to hear about thread exits. */ | |
2494 | if (report_thread_events | |
2495 | || last_thread_of_process_p (pid_of (thread))) | |
582511be | 2496 | { |
65706a29 PA |
2497 | /* Since events are serialized to GDB core, and we can't |
2498 | report this one right now. Leave the status pending for | |
2499 | the next time we're able to report it. */ | |
2500 | mark_lwp_dead (child, wstat); | |
2501 | return child; | |
582511be PA |
2502 | } |
2503 | else | |
2504 | { | |
65706a29 PA |
2505 | delete_lwp (child); |
2506 | return NULL; | |
582511be PA |
2507 | } |
2508 | } | |
2509 | ||
2510 | gdb_assert (WIFSTOPPED (wstat)); | |
2511 | ||
fa96cb38 PA |
2512 | if (WIFSTOPPED (wstat)) |
2513 | { | |
2514 | struct process_info *proc; | |
2515 | ||
c06cbd92 | 2516 | /* Architecture-specific setup after inferior is running. */ |
fa96cb38 | 2517 | proc = find_process_pid (pid_of (thread)); |
c06cbd92 | 2518 | if (proc->tdesc == NULL) |
fa96cb38 | 2519 | { |
c06cbd92 YQ |
2520 | if (proc->attached) |
2521 | { | |
c06cbd92 YQ |
2522 | /* This needs to happen after we have attached to the |
2523 | inferior and it is stopped for the first time, but | |
2524 | before we access any inferior registers. */ | |
94585166 | 2525 | linux_arch_setup_thread (thread); |
c06cbd92 YQ |
2526 | } |
2527 | else | |
2528 | { | |
2529 | /* The process is started, but GDBserver will do | |
2530 | architecture-specific setup after the program stops at | |
2531 | the first instruction. */ | |
2532 | child->status_pending_p = 1; | |
2533 | child->status_pending = wstat; | |
2534 | return child; | |
2535 | } | |
fa96cb38 PA |
2536 | } |
2537 | } | |
2538 | ||
fa96cb38 PA |
2539 | if (WIFSTOPPED (wstat) && child->must_set_ptrace_flags) |
2540 | { | |
beed38b8 | 2541 | struct process_info *proc = find_process_pid (pid_of (thread)); |
de0d863e | 2542 | int options = linux_low_ptrace_options (proc->attached); |
beed38b8 | 2543 | |
de0d863e | 2544 | linux_enable_event_reporting (lwpid, options); |
fa96cb38 PA |
2545 | child->must_set_ptrace_flags = 0; |
2546 | } | |
2547 | ||
82075af2 JS |
2548 | /* Always update syscall_state, even if it will be filtered later. */ |
2549 | if (WIFSTOPPED (wstat) && WSTOPSIG (wstat) == SYSCALL_SIGTRAP) | |
2550 | { | |
2551 | child->syscall_state | |
2552 | = (child->syscall_state == TARGET_WAITKIND_SYSCALL_ENTRY | |
2553 | ? TARGET_WAITKIND_SYSCALL_RETURN | |
2554 | : TARGET_WAITKIND_SYSCALL_ENTRY); | |
2555 | } | |
2556 | else | |
2557 | { | |
2558 | /* Almost all other ptrace-stops are known to be outside of system | |
2559 | calls, with further exceptions in handle_extended_wait. */ | |
2560 | child->syscall_state = TARGET_WAITKIND_IGNORE; | |
2561 | } | |
2562 | ||
e7ad2f14 PA |
2563 | /* Be careful to not overwrite stop_pc until save_stop_reason is |
2564 | called. */ | |
fa96cb38 | 2565 | if (WIFSTOPPED (wstat) && WSTOPSIG (wstat) == SIGTRAP |
89a5711c | 2566 | && linux_is_extended_waitstatus (wstat)) |
fa96cb38 | 2567 | { |
582511be | 2568 | child->stop_pc = get_pc (child); |
94585166 | 2569 | if (handle_extended_wait (&child, wstat)) |
de0d863e DB |
2570 | { |
2571 | /* The event has been handled, so just return without | |
2572 | reporting it. */ | |
2573 | return NULL; | |
2574 | } | |
fa96cb38 PA |
2575 | } |
2576 | ||
80aea927 | 2577 | if (linux_wstatus_maybe_breakpoint (wstat)) |
582511be | 2578 | { |
e7ad2f14 | 2579 | if (save_stop_reason (child)) |
582511be PA |
2580 | have_stop_pc = 1; |
2581 | } | |
2582 | ||
2583 | if (!have_stop_pc) | |
2584 | child->stop_pc = get_pc (child); | |
2585 | ||
fa96cb38 PA |
2586 | if (WIFSTOPPED (wstat) && WSTOPSIG (wstat) == SIGSTOP |
2587 | && child->stop_expected) | |
2588 | { | |
2589 | if (debug_threads) | |
2590 | debug_printf ("Expected stop.\n"); | |
2591 | child->stop_expected = 0; | |
2592 | ||
2593 | if (thread->last_resume_kind == resume_stop) | |
2594 | { | |
2595 | /* We want to report the stop to the core. Treat the | |
2596 | SIGSTOP as a normal event. */ | |
2bf6fb9d PA |
2597 | if (debug_threads) |
2598 | debug_printf ("LLW: resume_stop SIGSTOP caught for %s.\n", | |
2599 | target_pid_to_str (ptid_of (thread))); | |
fa96cb38 PA |
2600 | } |
2601 | else if (stopping_threads != NOT_STOPPING_THREADS) | |
2602 | { | |
2603 | /* Stopping threads. We don't want this SIGSTOP to end up | |
582511be | 2604 | pending. */ |
2bf6fb9d PA |
2605 | if (debug_threads) |
2606 | debug_printf ("LLW: SIGSTOP caught for %s " | |
2607 | "while stopping threads.\n", | |
2608 | target_pid_to_str (ptid_of (thread))); | |
fa96cb38 PA |
2609 | return NULL; |
2610 | } | |
2611 | else | |
2612 | { | |
2bf6fb9d PA |
2613 | /* This is a delayed SIGSTOP. Filter out the event. */ |
2614 | if (debug_threads) | |
2615 | debug_printf ("LLW: %s %s, 0, 0 (discard delayed SIGSTOP)\n", | |
2616 | child->stepping ? "step" : "continue", | |
2617 | target_pid_to_str (ptid_of (thread))); | |
2618 | ||
fa96cb38 PA |
2619 | linux_resume_one_lwp (child, child->stepping, 0, NULL); |
2620 | return NULL; | |
2621 | } | |
2622 | } | |
2623 | ||
582511be PA |
2624 | child->status_pending_p = 1; |
2625 | child->status_pending = wstat; | |
fa96cb38 PA |
2626 | return child; |
2627 | } | |
2628 | ||
f79b145d YQ |
2629 | /* Return true if THREAD is doing hardware single step. */ |
2630 | ||
2631 | static int | |
2632 | maybe_hw_step (struct thread_info *thread) | |
2633 | { | |
2634 | if (can_hardware_single_step ()) | |
2635 | return 1; | |
2636 | else | |
2637 | { | |
3b9a79ef | 2638 | /* GDBserver must insert single-step breakpoint for software |
f79b145d | 2639 | single step. */ |
3b9a79ef | 2640 | gdb_assert (has_single_step_breakpoints (thread)); |
f79b145d YQ |
2641 | return 0; |
2642 | } | |
2643 | } | |
2644 | ||
20ba1ce6 PA |
2645 | /* Resume LWPs that are currently stopped without any pending status |
2646 | to report, but are resumed from the core's perspective. */ | |
2647 | ||
2648 | static void | |
2649 | resume_stopped_resumed_lwps (struct inferior_list_entry *entry) | |
2650 | { | |
2651 | struct thread_info *thread = (struct thread_info *) entry; | |
2652 | struct lwp_info *lp = get_thread_lwp (thread); | |
2653 | ||
2654 | if (lp->stopped | |
863d01bd | 2655 | && !lp->suspended |
20ba1ce6 | 2656 | && !lp->status_pending_p |
20ba1ce6 PA |
2657 | && thread->last_status.kind == TARGET_WAITKIND_IGNORE) |
2658 | { | |
8901d193 YQ |
2659 | int step = 0; |
2660 | ||
2661 | if (thread->last_resume_kind == resume_step) | |
2662 | step = maybe_hw_step (thread); | |
20ba1ce6 PA |
2663 | |
2664 | if (debug_threads) | |
2665 | debug_printf ("RSRL: resuming stopped-resumed LWP %s at %s: step=%d\n", | |
2666 | target_pid_to_str (ptid_of (thread)), | |
2667 | paddress (lp->stop_pc), | |
2668 | step); | |
2669 | ||
2670 | linux_resume_one_lwp (lp, step, GDB_SIGNAL_0, NULL); | |
2671 | } | |
2672 | } | |
2673 | ||
fa96cb38 PA |
2674 | /* Wait for an event from child(ren) WAIT_PTID, and return any that |
2675 | match FILTER_PTID (leaving others pending). The PTIDs can be: | |
2676 | minus_one_ptid, to specify any child; a pid PTID, specifying all | |
2677 | lwps of a thread group; or a PTID representing a single lwp. Store | |
2678 | the stop status through the status pointer WSTAT. OPTIONS is | |
2679 | passed to the waitpid call. Return 0 if no event was found and | |
2680 | OPTIONS contains WNOHANG. Return -1 if no unwaited-for children | |
2681 | was found. Return the PID of the stopped child otherwise. */ | |
bd99dc85 | 2682 | |
0d62e5e8 | 2683 | static int |
fa96cb38 PA |
2684 | linux_wait_for_event_filtered (ptid_t wait_ptid, ptid_t filter_ptid, |
2685 | int *wstatp, int options) | |
0d62e5e8 | 2686 | { |
d86d4aaf | 2687 | struct thread_info *event_thread; |
d50171e4 | 2688 | struct lwp_info *event_child, *requested_child; |
fa96cb38 | 2689 | sigset_t block_mask, prev_mask; |
d50171e4 | 2690 | |
fa96cb38 | 2691 | retry: |
d86d4aaf DE |
2692 | /* N.B. event_thread points to the thread_info struct that contains |
2693 | event_child. Keep them in sync. */ | |
2694 | event_thread = NULL; | |
d50171e4 PA |
2695 | event_child = NULL; |
2696 | requested_child = NULL; | |
0d62e5e8 | 2697 | |
95954743 | 2698 | /* Check for a lwp with a pending status. */ |
bd99dc85 | 2699 | |
fa96cb38 | 2700 | if (ptid_equal (filter_ptid, minus_one_ptid) || ptid_is_pid (filter_ptid)) |
0d62e5e8 | 2701 | { |
d86d4aaf | 2702 | event_thread = (struct thread_info *) |
89342618 YQ |
2703 | find_inferior_in_random (&all_threads, status_pending_p_callback, |
2704 | &filter_ptid); | |
d86d4aaf DE |
2705 | if (event_thread != NULL) |
2706 | event_child = get_thread_lwp (event_thread); | |
2707 | if (debug_threads && event_thread) | |
2708 | debug_printf ("Got a pending child %ld\n", lwpid_of (event_thread)); | |
0d62e5e8 | 2709 | } |
fa96cb38 | 2710 | else if (!ptid_equal (filter_ptid, null_ptid)) |
0d62e5e8 | 2711 | { |
fa96cb38 | 2712 | requested_child = find_lwp_pid (filter_ptid); |
d50171e4 | 2713 | |
bde24c0a | 2714 | if (stopping_threads == NOT_STOPPING_THREADS |
fa593d66 PA |
2715 | && requested_child->status_pending_p |
2716 | && requested_child->collecting_fast_tracepoint) | |
2717 | { | |
2718 | enqueue_one_deferred_signal (requested_child, | |
2719 | &requested_child->status_pending); | |
2720 | requested_child->status_pending_p = 0; | |
2721 | requested_child->status_pending = 0; | |
2722 | linux_resume_one_lwp (requested_child, 0, 0, NULL); | |
2723 | } | |
2724 | ||
2725 | if (requested_child->suspended | |
2726 | && requested_child->status_pending_p) | |
38e08fca GB |
2727 | { |
2728 | internal_error (__FILE__, __LINE__, | |
2729 | "requesting an event out of a" | |
2730 | " suspended child?"); | |
2731 | } | |
fa593d66 | 2732 | |
d50171e4 | 2733 | if (requested_child->status_pending_p) |
d86d4aaf DE |
2734 | { |
2735 | event_child = requested_child; | |
2736 | event_thread = get_lwp_thread (event_child); | |
2737 | } | |
0d62e5e8 | 2738 | } |
611cb4a5 | 2739 | |
0d62e5e8 DJ |
2740 | if (event_child != NULL) |
2741 | { | |
bd99dc85 | 2742 | if (debug_threads) |
87ce2a04 | 2743 | debug_printf ("Got an event from pending child %ld (%04x)\n", |
d86d4aaf | 2744 | lwpid_of (event_thread), event_child->status_pending); |
fa96cb38 | 2745 | *wstatp = event_child->status_pending; |
bd99dc85 PA |
2746 | event_child->status_pending_p = 0; |
2747 | event_child->status_pending = 0; | |
0bfdf32f | 2748 | current_thread = event_thread; |
d86d4aaf | 2749 | return lwpid_of (event_thread); |
0d62e5e8 DJ |
2750 | } |
2751 | ||
fa96cb38 PA |
2752 | /* But if we don't find a pending event, we'll have to wait. |
2753 | ||
2754 | We only enter this loop if no process has a pending wait status. | |
2755 | Thus any action taken in response to a wait status inside this | |
2756 | loop is responding as soon as we detect the status, not after any | |
2757 | pending events. */ | |
d8301ad1 | 2758 | |
fa96cb38 PA |
2759 | /* Make sure SIGCHLD is blocked until the sigsuspend below. Block |
2760 | all signals while here. */ | |
2761 | sigfillset (&block_mask); | |
2762 | sigprocmask (SIG_BLOCK, &block_mask, &prev_mask); | |
2763 | ||
582511be PA |
2764 | /* Always pull all events out of the kernel. We'll randomly select |
2765 | an event LWP out of all that have events, to prevent | |
2766 | starvation. */ | |
fa96cb38 | 2767 | while (event_child == NULL) |
0d62e5e8 | 2768 | { |
fa96cb38 | 2769 | pid_t ret = 0; |
0d62e5e8 | 2770 | |
fa96cb38 PA |
2771 | /* Always use -1 and WNOHANG, due to couple of a kernel/ptrace |
2772 | quirks: | |
0d62e5e8 | 2773 | |
fa96cb38 PA |
2774 | - If the thread group leader exits while other threads in the |
2775 | thread group still exist, waitpid(TGID, ...) hangs. That | |
2776 | waitpid won't return an exit status until the other threads | |
2777 | in the group are reaped. | |
611cb4a5 | 2778 | |
fa96cb38 PA |
2779 | - When a non-leader thread execs, that thread just vanishes |
2780 | without reporting an exit (so we'd hang if we waited for it | |
2781 | explicitly in that case). The exec event is reported to | |
94585166 | 2782 | the TGID pid. */ |
fa96cb38 PA |
2783 | errno = 0; |
2784 | ret = my_waitpid (-1, wstatp, options | WNOHANG); | |
d8301ad1 | 2785 | |
fa96cb38 PA |
2786 | if (debug_threads) |
2787 | debug_printf ("LWFE: waitpid(-1, ...) returned %d, %s\n", | |
2788 | ret, errno ? strerror (errno) : "ERRNO-OK"); | |
0d62e5e8 | 2789 | |
fa96cb38 | 2790 | if (ret > 0) |
0d62e5e8 | 2791 | { |
89be2091 | 2792 | if (debug_threads) |
bd99dc85 | 2793 | { |
fa96cb38 PA |
2794 | debug_printf ("LLW: waitpid %ld received %s\n", |
2795 | (long) ret, status_to_str (*wstatp)); | |
bd99dc85 | 2796 | } |
89be2091 | 2797 | |
582511be PA |
2798 | /* Filter all events. IOW, leave all events pending. We'll |
2799 | randomly select an event LWP out of all that have events | |
2800 | below. */ | |
2801 | linux_low_filter_event (ret, *wstatp); | |
fa96cb38 PA |
2802 | /* Retry until nothing comes out of waitpid. A single |
2803 | SIGCHLD can indicate more than one child stopped. */ | |
89be2091 DJ |
2804 | continue; |
2805 | } | |
2806 | ||
20ba1ce6 PA |
2807 | /* Now that we've pulled all events out of the kernel, resume |
2808 | LWPs that don't have an interesting event to report. */ | |
2809 | if (stopping_threads == NOT_STOPPING_THREADS) | |
2810 | for_each_inferior (&all_threads, resume_stopped_resumed_lwps); | |
2811 | ||
2812 | /* ... and find an LWP with a status to report to the core, if | |
2813 | any. */ | |
582511be | 2814 | event_thread = (struct thread_info *) |
89342618 YQ |
2815 | find_inferior_in_random (&all_threads, status_pending_p_callback, |
2816 | &filter_ptid); | |
582511be PA |
2817 | if (event_thread != NULL) |
2818 | { | |
2819 | event_child = get_thread_lwp (event_thread); | |
2820 | *wstatp = event_child->status_pending; | |
2821 | event_child->status_pending_p = 0; | |
2822 | event_child->status_pending = 0; | |
2823 | break; | |
2824 | } | |
2825 | ||
fa96cb38 PA |
2826 | /* Check for zombie thread group leaders. Those can't be reaped |
2827 | until all other threads in the thread group are. */ | |
2828 | check_zombie_leaders (); | |
2829 | ||
2830 | /* If there are no resumed children left in the set of LWPs we | |
2831 | want to wait for, bail. We can't just block in | |
2832 | waitpid/sigsuspend, because lwps might have been left stopped | |
2833 | in trace-stop state, and we'd be stuck forever waiting for | |
2834 | their status to change (which would only happen if we resumed | |
2835 | them). Even if WNOHANG is set, this return code is preferred | |
2836 | over 0 (below), as it is more detailed. */ | |
2837 | if ((find_inferior (&all_threads, | |
2838 | not_stopped_callback, | |
2839 | &wait_ptid) == NULL)) | |
a6dbe5df | 2840 | { |
fa96cb38 PA |
2841 | if (debug_threads) |
2842 | debug_printf ("LLW: exit (no unwaited-for LWP)\n"); | |
2843 | sigprocmask (SIG_SETMASK, &prev_mask, NULL); | |
2844 | return -1; | |
a6dbe5df PA |
2845 | } |
2846 | ||
fa96cb38 PA |
2847 | /* No interesting event to report to the caller. */ |
2848 | if ((options & WNOHANG)) | |
24a09b5f | 2849 | { |
fa96cb38 PA |
2850 | if (debug_threads) |
2851 | debug_printf ("WNOHANG set, no event found\n"); | |
2852 | ||
2853 | sigprocmask (SIG_SETMASK, &prev_mask, NULL); | |
2854 | return 0; | |
24a09b5f DJ |
2855 | } |
2856 | ||
fa96cb38 PA |
2857 | /* Block until we get an event reported with SIGCHLD. */ |
2858 | if (debug_threads) | |
2859 | debug_printf ("sigsuspend'ing\n"); | |
d50171e4 | 2860 | |
fa96cb38 PA |
2861 | sigsuspend (&prev_mask); |
2862 | sigprocmask (SIG_SETMASK, &prev_mask, NULL); | |
2863 | goto retry; | |
2864 | } | |
d50171e4 | 2865 | |
fa96cb38 | 2866 | sigprocmask (SIG_SETMASK, &prev_mask, NULL); |
d50171e4 | 2867 | |
0bfdf32f | 2868 | current_thread = event_thread; |
d50171e4 | 2869 | |
fa96cb38 PA |
2870 | return lwpid_of (event_thread); |
2871 | } | |
2872 | ||
2873 | /* Wait for an event from child(ren) PTID. PTIDs can be: | |
2874 | minus_one_ptid, to specify any child; a pid PTID, specifying all | |
2875 | lwps of a thread group; or a PTID representing a single lwp. Store | |
2876 | the stop status through the status pointer WSTAT. OPTIONS is | |
2877 | passed to the waitpid call. Return 0 if no event was found and | |
2878 | OPTIONS contains WNOHANG. Return -1 if no unwaited-for children | |
2879 | was found. Return the PID of the stopped child otherwise. */ | |
2880 | ||
2881 | static int | |
2882 | linux_wait_for_event (ptid_t ptid, int *wstatp, int options) | |
2883 | { | |
2884 | return linux_wait_for_event_filtered (ptid, ptid, wstatp, options); | |
611cb4a5 DJ |
2885 | } |
2886 | ||
6bf5e0ba PA |
2887 | /* Count the LWP's that have had events. */ |
2888 | ||
2889 | static int | |
2890 | count_events_callback (struct inferior_list_entry *entry, void *data) | |
2891 | { | |
d86d4aaf | 2892 | struct thread_info *thread = (struct thread_info *) entry; |
8bf3b159 | 2893 | struct lwp_info *lp = get_thread_lwp (thread); |
9a3c8263 | 2894 | int *count = (int *) data; |
6bf5e0ba PA |
2895 | |
2896 | gdb_assert (count != NULL); | |
2897 | ||
582511be | 2898 | /* Count only resumed LWPs that have an event pending. */ |
8336d594 | 2899 | if (thread->last_status.kind == TARGET_WAITKIND_IGNORE |
8bf3b159 | 2900 | && lp->status_pending_p) |
6bf5e0ba PA |
2901 | (*count)++; |
2902 | ||
2903 | return 0; | |
2904 | } | |
2905 | ||
2906 | /* Select the LWP (if any) that is currently being single-stepped. */ | |
2907 | ||
2908 | static int | |
2909 | select_singlestep_lwp_callback (struct inferior_list_entry *entry, void *data) | |
2910 | { | |
d86d4aaf DE |
2911 | struct thread_info *thread = (struct thread_info *) entry; |
2912 | struct lwp_info *lp = get_thread_lwp (thread); | |
6bf5e0ba | 2913 | |
8336d594 PA |
2914 | if (thread->last_status.kind == TARGET_WAITKIND_IGNORE |
2915 | && thread->last_resume_kind == resume_step | |
6bf5e0ba PA |
2916 | && lp->status_pending_p) |
2917 | return 1; | |
2918 | else | |
2919 | return 0; | |
2920 | } | |
2921 | ||
b90fc188 | 2922 | /* Select the Nth LWP that has had an event. */ |
6bf5e0ba PA |
2923 | |
2924 | static int | |
2925 | select_event_lwp_callback (struct inferior_list_entry *entry, void *data) | |
2926 | { | |
d86d4aaf | 2927 | struct thread_info *thread = (struct thread_info *) entry; |
8bf3b159 | 2928 | struct lwp_info *lp = get_thread_lwp (thread); |
9a3c8263 | 2929 | int *selector = (int *) data; |
6bf5e0ba PA |
2930 | |
2931 | gdb_assert (selector != NULL); | |
2932 | ||
582511be | 2933 | /* Select only resumed LWPs that have an event pending. */ |
91baf43f | 2934 | if (thread->last_status.kind == TARGET_WAITKIND_IGNORE |
8bf3b159 | 2935 | && lp->status_pending_p) |
6bf5e0ba PA |
2936 | if ((*selector)-- == 0) |
2937 | return 1; | |
2938 | ||
2939 | return 0; | |
2940 | } | |
2941 | ||
6bf5e0ba PA |
2942 | /* Select one LWP out of those that have events pending. */ |
2943 | ||
2944 | static void | |
2945 | select_event_lwp (struct lwp_info **orig_lp) | |
2946 | { | |
2947 | int num_events = 0; | |
2948 | int random_selector; | |
582511be PA |
2949 | struct thread_info *event_thread = NULL; |
2950 | ||
2951 | /* In all-stop, give preference to the LWP that is being | |
2952 | single-stepped. There will be at most one, and it's the LWP that | |
2953 | the core is most interested in. If we didn't do this, then we'd | |
2954 | have to handle pending step SIGTRAPs somehow in case the core | |
2955 | later continues the previously-stepped thread, otherwise we'd | |
2956 | report the pending SIGTRAP, and the core, not having stepped the | |
2957 | thread, wouldn't understand what the trap was for, and therefore | |
2958 | would report it to the user as a random signal. */ | |
2959 | if (!non_stop) | |
6bf5e0ba | 2960 | { |
582511be PA |
2961 | event_thread |
2962 | = (struct thread_info *) find_inferior (&all_threads, | |
2963 | select_singlestep_lwp_callback, | |
2964 | NULL); | |
2965 | if (event_thread != NULL) | |
2966 | { | |
2967 | if (debug_threads) | |
2968 | debug_printf ("SEL: Select single-step %s\n", | |
2969 | target_pid_to_str (ptid_of (event_thread))); | |
2970 | } | |
6bf5e0ba | 2971 | } |
582511be | 2972 | if (event_thread == NULL) |
6bf5e0ba PA |
2973 | { |
2974 | /* No single-stepping LWP. Select one at random, out of those | |
b90fc188 | 2975 | which have had events. */ |
6bf5e0ba | 2976 | |
b90fc188 | 2977 | /* First see how many events we have. */ |
d86d4aaf | 2978 | find_inferior (&all_threads, count_events_callback, &num_events); |
8bf3b159 | 2979 | gdb_assert (num_events > 0); |
6bf5e0ba | 2980 | |
b90fc188 PA |
2981 | /* Now randomly pick a LWP out of those that have had |
2982 | events. */ | |
6bf5e0ba PA |
2983 | random_selector = (int) |
2984 | ((num_events * (double) rand ()) / (RAND_MAX + 1.0)); | |
2985 | ||
2986 | if (debug_threads && num_events > 1) | |
87ce2a04 DE |
2987 | debug_printf ("SEL: Found %d SIGTRAP events, selecting #%d\n", |
2988 | num_events, random_selector); | |
6bf5e0ba | 2989 | |
d86d4aaf DE |
2990 | event_thread |
2991 | = (struct thread_info *) find_inferior (&all_threads, | |
2992 | select_event_lwp_callback, | |
2993 | &random_selector); | |
6bf5e0ba PA |
2994 | } |
2995 | ||
d86d4aaf | 2996 | if (event_thread != NULL) |
6bf5e0ba | 2997 | { |
d86d4aaf DE |
2998 | struct lwp_info *event_lp = get_thread_lwp (event_thread); |
2999 | ||
6bf5e0ba PA |
3000 | /* Switch the event LWP. */ |
3001 | *orig_lp = event_lp; | |
3002 | } | |
3003 | } | |
3004 | ||
7984d532 PA |
3005 | /* Decrement the suspend count of an LWP. */ |
3006 | ||
3007 | static int | |
3008 | unsuspend_one_lwp (struct inferior_list_entry *entry, void *except) | |
3009 | { | |
d86d4aaf DE |
3010 | struct thread_info *thread = (struct thread_info *) entry; |
3011 | struct lwp_info *lwp = get_thread_lwp (thread); | |
7984d532 PA |
3012 | |
3013 | /* Ignore EXCEPT. */ | |
3014 | if (lwp == except) | |
3015 | return 0; | |
3016 | ||
863d01bd | 3017 | lwp_suspended_decr (lwp); |
7984d532 PA |
3018 | return 0; |
3019 | } | |
3020 | ||
3021 | /* Decrement the suspend count of all LWPs, except EXCEPT, if non | |
3022 | NULL. */ | |
3023 | ||
3024 | static void | |
3025 | unsuspend_all_lwps (struct lwp_info *except) | |
3026 | { | |
d86d4aaf | 3027 | find_inferior (&all_threads, unsuspend_one_lwp, except); |
7984d532 PA |
3028 | } |
3029 | ||
fa593d66 PA |
3030 | static void move_out_of_jump_pad_callback (struct inferior_list_entry *entry); |
3031 | static int stuck_in_jump_pad_callback (struct inferior_list_entry *entry, | |
3032 | void *data); | |
3033 | static int lwp_running (struct inferior_list_entry *entry, void *data); | |
3034 | static ptid_t linux_wait_1 (ptid_t ptid, | |
3035 | struct target_waitstatus *ourstatus, | |
3036 | int target_options); | |
3037 | ||
3038 | /* Stabilize threads (move out of jump pads). | |
3039 | ||
3040 | If a thread is midway collecting a fast tracepoint, we need to | |
3041 | finish the collection and move it out of the jump pad before | |
3042 | reporting the signal. | |
3043 | ||
3044 | This avoids recursion while collecting (when a signal arrives | |
3045 | midway, and the signal handler itself collects), which would trash | |
3046 | the trace buffer. In case the user set a breakpoint in a signal | |
3047 | handler, this avoids the backtrace showing the jump pad, etc.. | |
3048 | Most importantly, there are certain things we can't do safely if | |
3049 | threads are stopped in a jump pad (or in its callee's). For | |
3050 | example: | |
3051 | ||
3052 | - starting a new trace run. A thread still collecting the | |
3053 | previous run, could trash the trace buffer when resumed. The trace | |
3054 | buffer control structures would have been reset but the thread had | |
3055 | no way to tell. The thread could even midway memcpy'ing to the | |
3056 | buffer, which would mean that when resumed, it would clobber the | |
3057 | trace buffer that had been set for a new run. | |
3058 | ||
3059 | - we can't rewrite/reuse the jump pads for new tracepoints | |
3060 | safely. Say you do tstart while a thread is stopped midway while | |
3061 | collecting. When the thread is later resumed, it finishes the | |
3062 | collection, and returns to the jump pad, to execute the original | |
3063 | instruction that was under the tracepoint jump at the time the | |
3064 | older run had been started. If the jump pad had been rewritten | |
3065 | since for something else in the new run, the thread would now | |
3066 | execute the wrong / random instructions. */ | |
3067 | ||
3068 | static void | |
3069 | linux_stabilize_threads (void) | |
3070 | { | |
0bfdf32f | 3071 | struct thread_info *saved_thread; |
d86d4aaf | 3072 | struct thread_info *thread_stuck; |
fa593d66 | 3073 | |
d86d4aaf DE |
3074 | thread_stuck |
3075 | = (struct thread_info *) find_inferior (&all_threads, | |
3076 | stuck_in_jump_pad_callback, | |
3077 | NULL); | |
3078 | if (thread_stuck != NULL) | |
fa593d66 | 3079 | { |
b4d51a55 | 3080 | if (debug_threads) |
87ce2a04 | 3081 | debug_printf ("can't stabilize, LWP %ld is stuck in jump pad\n", |
d86d4aaf | 3082 | lwpid_of (thread_stuck)); |
fa593d66 PA |
3083 | return; |
3084 | } | |
3085 | ||
0bfdf32f | 3086 | saved_thread = current_thread; |
fa593d66 PA |
3087 | |
3088 | stabilizing_threads = 1; | |
3089 | ||
3090 | /* Kick 'em all. */ | |
d86d4aaf | 3091 | for_each_inferior (&all_threads, move_out_of_jump_pad_callback); |
fa593d66 PA |
3092 | |
3093 | /* Loop until all are stopped out of the jump pads. */ | |
d86d4aaf | 3094 | while (find_inferior (&all_threads, lwp_running, NULL) != NULL) |
fa593d66 PA |
3095 | { |
3096 | struct target_waitstatus ourstatus; | |
3097 | struct lwp_info *lwp; | |
fa593d66 PA |
3098 | int wstat; |
3099 | ||
3100 | /* Note that we go through the full wait even loop. While | |
3101 | moving threads out of jump pad, we need to be able to step | |
3102 | over internal breakpoints and such. */ | |
32fcada3 | 3103 | linux_wait_1 (minus_one_ptid, &ourstatus, 0); |
fa593d66 PA |
3104 | |
3105 | if (ourstatus.kind == TARGET_WAITKIND_STOPPED) | |
3106 | { | |
0bfdf32f | 3107 | lwp = get_thread_lwp (current_thread); |
fa593d66 PA |
3108 | |
3109 | /* Lock it. */ | |
863d01bd | 3110 | lwp_suspended_inc (lwp); |
fa593d66 | 3111 | |
a493e3e2 | 3112 | if (ourstatus.value.sig != GDB_SIGNAL_0 |
0bfdf32f | 3113 | || current_thread->last_resume_kind == resume_stop) |
fa593d66 | 3114 | { |
2ea28649 | 3115 | wstat = W_STOPCODE (gdb_signal_to_host (ourstatus.value.sig)); |
fa593d66 PA |
3116 | enqueue_one_deferred_signal (lwp, &wstat); |
3117 | } | |
3118 | } | |
3119 | } | |
3120 | ||
fcdad592 | 3121 | unsuspend_all_lwps (NULL); |
fa593d66 PA |
3122 | |
3123 | stabilizing_threads = 0; | |
3124 | ||
0bfdf32f | 3125 | current_thread = saved_thread; |
fa593d66 | 3126 | |
b4d51a55 | 3127 | if (debug_threads) |
fa593d66 | 3128 | { |
d86d4aaf DE |
3129 | thread_stuck |
3130 | = (struct thread_info *) find_inferior (&all_threads, | |
3131 | stuck_in_jump_pad_callback, | |
3132 | NULL); | |
3133 | if (thread_stuck != NULL) | |
87ce2a04 | 3134 | debug_printf ("couldn't stabilize, LWP %ld got stuck in jump pad\n", |
d86d4aaf | 3135 | lwpid_of (thread_stuck)); |
fa593d66 PA |
3136 | } |
3137 | } | |
3138 | ||
582511be PA |
3139 | /* Convenience function that is called when the kernel reports an |
3140 | event that is not passed out to GDB. */ | |
3141 | ||
3142 | static ptid_t | |
3143 | ignore_event (struct target_waitstatus *ourstatus) | |
3144 | { | |
3145 | /* If we got an event, there may still be others, as a single | |
3146 | SIGCHLD can indicate more than one child stopped. This forces | |
3147 | another target_wait call. */ | |
3148 | async_file_mark (); | |
3149 | ||
3150 | ourstatus->kind = TARGET_WAITKIND_IGNORE; | |
3151 | return null_ptid; | |
3152 | } | |
3153 | ||
65706a29 PA |
3154 | /* Convenience function that is called when the kernel reports an exit |
3155 | event. This decides whether to report the event to GDB as a | |
3156 | process exit event, a thread exit event, or to suppress the | |
3157 | event. */ | |
3158 | ||
3159 | static ptid_t | |
3160 | filter_exit_event (struct lwp_info *event_child, | |
3161 | struct target_waitstatus *ourstatus) | |
3162 | { | |
3163 | struct thread_info *thread = get_lwp_thread (event_child); | |
3164 | ptid_t ptid = ptid_of (thread); | |
3165 | ||
3166 | if (!last_thread_of_process_p (pid_of (thread))) | |
3167 | { | |
3168 | if (report_thread_events) | |
3169 | ourstatus->kind = TARGET_WAITKIND_THREAD_EXITED; | |
3170 | else | |
3171 | ourstatus->kind = TARGET_WAITKIND_IGNORE; | |
3172 | ||
3173 | delete_lwp (event_child); | |
3174 | } | |
3175 | return ptid; | |
3176 | } | |
3177 | ||
82075af2 JS |
3178 | /* Returns 1 if GDB is interested in any event_child syscalls. */ |
3179 | ||
3180 | static int | |
3181 | gdb_catching_syscalls_p (struct lwp_info *event_child) | |
3182 | { | |
3183 | struct thread_info *thread = get_lwp_thread (event_child); | |
3184 | struct process_info *proc = get_thread_process (thread); | |
3185 | ||
3186 | return !VEC_empty (int, proc->syscalls_to_catch); | |
3187 | } | |
3188 | ||
3189 | /* Returns 1 if GDB is interested in the event_child syscall. | |
3190 | Only to be called when stopped reason is SYSCALL_SIGTRAP. */ | |
3191 | ||
3192 | static int | |
3193 | gdb_catch_this_syscall_p (struct lwp_info *event_child) | |
3194 | { | |
3195 | int i, iter; | |
4cc32bec | 3196 | int sysno; |
82075af2 JS |
3197 | struct thread_info *thread = get_lwp_thread (event_child); |
3198 | struct process_info *proc = get_thread_process (thread); | |
3199 | ||
3200 | if (VEC_empty (int, proc->syscalls_to_catch)) | |
3201 | return 0; | |
3202 | ||
3203 | if (VEC_index (int, proc->syscalls_to_catch, 0) == ANY_SYSCALL) | |
3204 | return 1; | |
3205 | ||
4cc32bec | 3206 | get_syscall_trapinfo (event_child, &sysno); |
82075af2 JS |
3207 | for (i = 0; |
3208 | VEC_iterate (int, proc->syscalls_to_catch, i, iter); | |
3209 | i++) | |
3210 | if (iter == sysno) | |
3211 | return 1; | |
3212 | ||
3213 | return 0; | |
3214 | } | |
3215 | ||
0d62e5e8 | 3216 | /* Wait for process, returns status. */ |
da6d8c04 | 3217 | |
95954743 PA |
3218 | static ptid_t |
3219 | linux_wait_1 (ptid_t ptid, | |
3220 | struct target_waitstatus *ourstatus, int target_options) | |
da6d8c04 | 3221 | { |
e5f1222d | 3222 | int w; |
fc7238bb | 3223 | struct lwp_info *event_child; |
bd99dc85 | 3224 | int options; |
bd99dc85 | 3225 | int pid; |
6bf5e0ba PA |
3226 | int step_over_finished; |
3227 | int bp_explains_trap; | |
3228 | int maybe_internal_trap; | |
3229 | int report_to_gdb; | |
219f2f23 | 3230 | int trace_event; |
c2d6af84 | 3231 | int in_step_range; |
f2faf941 | 3232 | int any_resumed; |
bd99dc85 | 3233 | |
87ce2a04 DE |
3234 | if (debug_threads) |
3235 | { | |
3236 | debug_enter (); | |
3237 | debug_printf ("linux_wait_1: [%s]\n", target_pid_to_str (ptid)); | |
3238 | } | |
3239 | ||
bd99dc85 PA |
3240 | /* Translate generic target options into linux options. */ |
3241 | options = __WALL; | |
3242 | if (target_options & TARGET_WNOHANG) | |
3243 | options |= WNOHANG; | |
0d62e5e8 | 3244 | |
fa593d66 PA |
3245 | bp_explains_trap = 0; |
3246 | trace_event = 0; | |
c2d6af84 | 3247 | in_step_range = 0; |
bd99dc85 PA |
3248 | ourstatus->kind = TARGET_WAITKIND_IGNORE; |
3249 | ||
f2faf941 PA |
3250 | /* Find a resumed LWP, if any. */ |
3251 | if (find_inferior (&all_threads, | |
3252 | status_pending_p_callback, | |
3253 | &minus_one_ptid) != NULL) | |
3254 | any_resumed = 1; | |
3255 | else if ((find_inferior (&all_threads, | |
3256 | not_stopped_callback, | |
3257 | &minus_one_ptid) != NULL)) | |
3258 | any_resumed = 1; | |
3259 | else | |
3260 | any_resumed = 0; | |
3261 | ||
6bf5e0ba PA |
3262 | if (ptid_equal (step_over_bkpt, null_ptid)) |
3263 | pid = linux_wait_for_event (ptid, &w, options); | |
3264 | else | |
3265 | { | |
3266 | if (debug_threads) | |
87ce2a04 DE |
3267 | debug_printf ("step_over_bkpt set [%s], doing a blocking wait\n", |
3268 | target_pid_to_str (step_over_bkpt)); | |
6bf5e0ba PA |
3269 | pid = linux_wait_for_event (step_over_bkpt, &w, options & ~WNOHANG); |
3270 | } | |
3271 | ||
f2faf941 | 3272 | if (pid == 0 || (pid == -1 && !any_resumed)) |
87ce2a04 | 3273 | { |
fa96cb38 PA |
3274 | gdb_assert (target_options & TARGET_WNOHANG); |
3275 | ||
87ce2a04 DE |
3276 | if (debug_threads) |
3277 | { | |
fa96cb38 PA |
3278 | debug_printf ("linux_wait_1 ret = null_ptid, " |
3279 | "TARGET_WAITKIND_IGNORE\n"); | |
87ce2a04 DE |
3280 | debug_exit (); |
3281 | } | |
fa96cb38 PA |
3282 | |
3283 | ourstatus->kind = TARGET_WAITKIND_IGNORE; | |
87ce2a04 DE |
3284 | return null_ptid; |
3285 | } | |
fa96cb38 PA |
3286 | else if (pid == -1) |
3287 | { | |
3288 | if (debug_threads) | |
3289 | { | |
3290 | debug_printf ("linux_wait_1 ret = null_ptid, " | |
3291 | "TARGET_WAITKIND_NO_RESUMED\n"); | |
3292 | debug_exit (); | |
3293 | } | |
bd99dc85 | 3294 | |
fa96cb38 PA |
3295 | ourstatus->kind = TARGET_WAITKIND_NO_RESUMED; |
3296 | return null_ptid; | |
3297 | } | |
0d62e5e8 | 3298 | |
0bfdf32f | 3299 | event_child = get_thread_lwp (current_thread); |
0d62e5e8 | 3300 | |
fa96cb38 PA |
3301 | /* linux_wait_for_event only returns an exit status for the last |
3302 | child of a process. Report it. */ | |
3303 | if (WIFEXITED (w) || WIFSIGNALED (w)) | |
da6d8c04 | 3304 | { |
fa96cb38 | 3305 | if (WIFEXITED (w)) |
0d62e5e8 | 3306 | { |
fa96cb38 PA |
3307 | ourstatus->kind = TARGET_WAITKIND_EXITED; |
3308 | ourstatus->value.integer = WEXITSTATUS (w); | |
bd99dc85 | 3309 | |
fa96cb38 | 3310 | if (debug_threads) |
bd99dc85 | 3311 | { |
fa96cb38 PA |
3312 | debug_printf ("linux_wait_1 ret = %s, exited with " |
3313 | "retcode %d\n", | |
0bfdf32f | 3314 | target_pid_to_str (ptid_of (current_thread)), |
fa96cb38 PA |
3315 | WEXITSTATUS (w)); |
3316 | debug_exit (); | |
bd99dc85 | 3317 | } |
fa96cb38 PA |
3318 | } |
3319 | else | |
3320 | { | |
3321 | ourstatus->kind = TARGET_WAITKIND_SIGNALLED; | |
3322 | ourstatus->value.sig = gdb_signal_from_host (WTERMSIG (w)); | |
5b1c542e | 3323 | |
fa96cb38 PA |
3324 | if (debug_threads) |
3325 | { | |
3326 | debug_printf ("linux_wait_1 ret = %s, terminated with " | |
3327 | "signal %d\n", | |
0bfdf32f | 3328 | target_pid_to_str (ptid_of (current_thread)), |
fa96cb38 PA |
3329 | WTERMSIG (w)); |
3330 | debug_exit (); | |
3331 | } | |
0d62e5e8 | 3332 | } |
fa96cb38 | 3333 | |
65706a29 PA |
3334 | if (ourstatus->kind == TARGET_WAITKIND_EXITED) |
3335 | return filter_exit_event (event_child, ourstatus); | |
3336 | ||
0bfdf32f | 3337 | return ptid_of (current_thread); |
da6d8c04 DJ |
3338 | } |
3339 | ||
2d97cd35 AT |
3340 | /* If step-over executes a breakpoint instruction, in the case of a |
3341 | hardware single step it means a gdb/gdbserver breakpoint had been | |
3342 | planted on top of a permanent breakpoint, in the case of a software | |
3343 | single step it may just mean that gdbserver hit the reinsert breakpoint. | |
e7ad2f14 | 3344 | The PC has been adjusted by save_stop_reason to point at |
2d97cd35 AT |
3345 | the breakpoint address. |
3346 | So in the case of the hardware single step advance the PC manually | |
3347 | past the breakpoint and in the case of software single step advance only | |
3b9a79ef | 3348 | if it's not the single_step_breakpoint we are hitting. |
2d97cd35 AT |
3349 | This avoids that a program would keep trapping a permanent breakpoint |
3350 | forever. */ | |
8090aef2 | 3351 | if (!ptid_equal (step_over_bkpt, null_ptid) |
2d97cd35 AT |
3352 | && event_child->stop_reason == TARGET_STOPPED_BY_SW_BREAKPOINT |
3353 | && (event_child->stepping | |
3b9a79ef | 3354 | || !single_step_breakpoint_inserted_here (event_child->stop_pc))) |
8090aef2 | 3355 | { |
dd373349 AT |
3356 | int increment_pc = 0; |
3357 | int breakpoint_kind = 0; | |
3358 | CORE_ADDR stop_pc = event_child->stop_pc; | |
3359 | ||
769ef81f AT |
3360 | breakpoint_kind = |
3361 | the_target->breakpoint_kind_from_current_state (&stop_pc); | |
dd373349 | 3362 | the_target->sw_breakpoint_from_kind (breakpoint_kind, &increment_pc); |
8090aef2 PA |
3363 | |
3364 | if (debug_threads) | |
3365 | { | |
3366 | debug_printf ("step-over for %s executed software breakpoint\n", | |
3367 | target_pid_to_str (ptid_of (current_thread))); | |
3368 | } | |
3369 | ||
3370 | if (increment_pc != 0) | |
3371 | { | |
3372 | struct regcache *regcache | |
3373 | = get_thread_regcache (current_thread, 1); | |
3374 | ||
3375 | event_child->stop_pc += increment_pc; | |
3376 | (*the_low_target.set_pc) (regcache, event_child->stop_pc); | |
3377 | ||
3378 | if (!(*the_low_target.breakpoint_at) (event_child->stop_pc)) | |
15c66dd6 | 3379 | event_child->stop_reason = TARGET_STOPPED_BY_NO_REASON; |
8090aef2 PA |
3380 | } |
3381 | } | |
3382 | ||
6bf5e0ba PA |
3383 | /* If this event was not handled before, and is not a SIGTRAP, we |
3384 | report it. SIGILL and SIGSEGV are also treated as traps in case | |
3385 | a breakpoint is inserted at the current PC. If this target does | |
3386 | not support internal breakpoints at all, we also report the | |
3387 | SIGTRAP without further processing; it's of no concern to us. */ | |
3388 | maybe_internal_trap | |
3389 | = (supports_breakpoints () | |
3390 | && (WSTOPSIG (w) == SIGTRAP | |
3391 | || ((WSTOPSIG (w) == SIGILL | |
3392 | || WSTOPSIG (w) == SIGSEGV) | |
3393 | && (*the_low_target.breakpoint_at) (event_child->stop_pc)))); | |
3394 | ||
3395 | if (maybe_internal_trap) | |
3396 | { | |
3397 | /* Handle anything that requires bookkeeping before deciding to | |
3398 | report the event or continue waiting. */ | |
3399 | ||
3400 | /* First check if we can explain the SIGTRAP with an internal | |
3401 | breakpoint, or if we should possibly report the event to GDB. | |
3402 | Do this before anything that may remove or insert a | |
3403 | breakpoint. */ | |
3404 | bp_explains_trap = breakpoint_inserted_here (event_child->stop_pc); | |
3405 | ||
3406 | /* We have a SIGTRAP, possibly a step-over dance has just | |
3407 | finished. If so, tweak the state machine accordingly, | |
3b9a79ef YQ |
3408 | reinsert breakpoints and delete any single-step |
3409 | breakpoints. */ | |
6bf5e0ba PA |
3410 | step_over_finished = finish_step_over (event_child); |
3411 | ||
3412 | /* Now invoke the callbacks of any internal breakpoints there. */ | |
3413 | check_breakpoints (event_child->stop_pc); | |
3414 | ||
219f2f23 PA |
3415 | /* Handle tracepoint data collecting. This may overflow the |
3416 | trace buffer, and cause a tracing stop, removing | |
3417 | breakpoints. */ | |
3418 | trace_event = handle_tracepoints (event_child); | |
3419 | ||
6bf5e0ba PA |
3420 | if (bp_explains_trap) |
3421 | { | |
6bf5e0ba | 3422 | if (debug_threads) |
87ce2a04 | 3423 | debug_printf ("Hit a gdbserver breakpoint.\n"); |
6bf5e0ba PA |
3424 | } |
3425 | } | |
3426 | else | |
3427 | { | |
3428 | /* We have some other signal, possibly a step-over dance was in | |
3429 | progress, and it should be cancelled too. */ | |
3430 | step_over_finished = finish_step_over (event_child); | |
fa593d66 PA |
3431 | } |
3432 | ||
3433 | /* We have all the data we need. Either report the event to GDB, or | |
3434 | resume threads and keep waiting for more. */ | |
3435 | ||
3436 | /* If we're collecting a fast tracepoint, finish the collection and | |
3437 | move out of the jump pad before delivering a signal. See | |
3438 | linux_stabilize_threads. */ | |
3439 | ||
3440 | if (WIFSTOPPED (w) | |
3441 | && WSTOPSIG (w) != SIGTRAP | |
3442 | && supports_fast_tracepoints () | |
58b4daa5 | 3443 | && agent_loaded_p ()) |
fa593d66 PA |
3444 | { |
3445 | if (debug_threads) | |
87ce2a04 DE |
3446 | debug_printf ("Got signal %d for LWP %ld. Check if we need " |
3447 | "to defer or adjust it.\n", | |
0bfdf32f | 3448 | WSTOPSIG (w), lwpid_of (current_thread)); |
fa593d66 PA |
3449 | |
3450 | /* Allow debugging the jump pad itself. */ | |
0bfdf32f | 3451 | if (current_thread->last_resume_kind != resume_step |
fa593d66 PA |
3452 | && maybe_move_out_of_jump_pad (event_child, &w)) |
3453 | { | |
3454 | enqueue_one_deferred_signal (event_child, &w); | |
3455 | ||
3456 | if (debug_threads) | |
87ce2a04 | 3457 | debug_printf ("Signal %d for LWP %ld deferred (in jump pad)\n", |
0bfdf32f | 3458 | WSTOPSIG (w), lwpid_of (current_thread)); |
fa593d66 PA |
3459 | |
3460 | linux_resume_one_lwp (event_child, 0, 0, NULL); | |
582511be | 3461 | |
edeeb602 YQ |
3462 | if (debug_threads) |
3463 | debug_exit (); | |
582511be | 3464 | return ignore_event (ourstatus); |
fa593d66 PA |
3465 | } |
3466 | } | |
219f2f23 | 3467 | |
fa593d66 PA |
3468 | if (event_child->collecting_fast_tracepoint) |
3469 | { | |
3470 | if (debug_threads) | |
87ce2a04 DE |
3471 | debug_printf ("LWP %ld was trying to move out of the jump pad (%d). " |
3472 | "Check if we're already there.\n", | |
0bfdf32f | 3473 | lwpid_of (current_thread), |
87ce2a04 | 3474 | event_child->collecting_fast_tracepoint); |
fa593d66 PA |
3475 | |
3476 | trace_event = 1; | |
3477 | ||
3478 | event_child->collecting_fast_tracepoint | |
3479 | = linux_fast_tracepoint_collecting (event_child, NULL); | |
3480 | ||
3481 | if (event_child->collecting_fast_tracepoint != 1) | |
3482 | { | |
3483 | /* No longer need this breakpoint. */ | |
3484 | if (event_child->exit_jump_pad_bkpt != NULL) | |
3485 | { | |
3486 | if (debug_threads) | |
87ce2a04 DE |
3487 | debug_printf ("No longer need exit-jump-pad bkpt; removing it." |
3488 | "stopping all threads momentarily.\n"); | |
fa593d66 PA |
3489 | |
3490 | /* Other running threads could hit this breakpoint. | |
3491 | We don't handle moribund locations like GDB does, | |
3492 | instead we always pause all threads when removing | |
3493 | breakpoints, so that any step-over or | |
3494 | decr_pc_after_break adjustment is always taken | |
3495 | care of while the breakpoint is still | |
3496 | inserted. */ | |
3497 | stop_all_lwps (1, event_child); | |
fa593d66 PA |
3498 | |
3499 | delete_breakpoint (event_child->exit_jump_pad_bkpt); | |
3500 | event_child->exit_jump_pad_bkpt = NULL; | |
3501 | ||
3502 | unstop_all_lwps (1, event_child); | |
3503 | ||
3504 | gdb_assert (event_child->suspended >= 0); | |
3505 | } | |
3506 | } | |
3507 | ||
3508 | if (event_child->collecting_fast_tracepoint == 0) | |
3509 | { | |
3510 | if (debug_threads) | |
87ce2a04 DE |
3511 | debug_printf ("fast tracepoint finished " |
3512 | "collecting successfully.\n"); | |
fa593d66 PA |
3513 | |
3514 | /* We may have a deferred signal to report. */ | |
3515 | if (dequeue_one_deferred_signal (event_child, &w)) | |
3516 | { | |
3517 | if (debug_threads) | |
87ce2a04 | 3518 | debug_printf ("dequeued one signal.\n"); |
fa593d66 | 3519 | } |
3c11dd79 | 3520 | else |
fa593d66 | 3521 | { |
3c11dd79 | 3522 | if (debug_threads) |
87ce2a04 | 3523 | debug_printf ("no deferred signals.\n"); |
fa593d66 PA |
3524 | |
3525 | if (stabilizing_threads) | |
3526 | { | |
3527 | ourstatus->kind = TARGET_WAITKIND_STOPPED; | |
a493e3e2 | 3528 | ourstatus->value.sig = GDB_SIGNAL_0; |
87ce2a04 DE |
3529 | |
3530 | if (debug_threads) | |
3531 | { | |
3532 | debug_printf ("linux_wait_1 ret = %s, stopped " | |
3533 | "while stabilizing threads\n", | |
0bfdf32f | 3534 | target_pid_to_str (ptid_of (current_thread))); |
87ce2a04 DE |
3535 | debug_exit (); |
3536 | } | |
3537 | ||
0bfdf32f | 3538 | return ptid_of (current_thread); |
fa593d66 PA |
3539 | } |
3540 | } | |
3541 | } | |
6bf5e0ba PA |
3542 | } |
3543 | ||
e471f25b PA |
3544 | /* Check whether GDB would be interested in this event. */ |
3545 | ||
82075af2 JS |
3546 | /* Check if GDB is interested in this syscall. */ |
3547 | if (WIFSTOPPED (w) | |
3548 | && WSTOPSIG (w) == SYSCALL_SIGTRAP | |
3549 | && !gdb_catch_this_syscall_p (event_child)) | |
3550 | { | |
3551 | if (debug_threads) | |
3552 | { | |
3553 | debug_printf ("Ignored syscall for LWP %ld.\n", | |
3554 | lwpid_of (current_thread)); | |
3555 | } | |
3556 | ||
3557 | linux_resume_one_lwp (event_child, event_child->stepping, | |
3558 | 0, NULL); | |
edeeb602 YQ |
3559 | |
3560 | if (debug_threads) | |
3561 | debug_exit (); | |
82075af2 JS |
3562 | return ignore_event (ourstatus); |
3563 | } | |
3564 | ||
e471f25b PA |
3565 | /* If GDB is not interested in this signal, don't stop other |
3566 | threads, and don't report it to GDB. Just resume the inferior | |
3567 | right away. We do this for threading-related signals as well as | |
3568 | any that GDB specifically requested we ignore. But never ignore | |
3569 | SIGSTOP if we sent it ourselves, and do not ignore signals when | |
3570 | stepping - they may require special handling to skip the signal | |
c9587f88 AT |
3571 | handler. Also never ignore signals that could be caused by a |
3572 | breakpoint. */ | |
e471f25b | 3573 | if (WIFSTOPPED (w) |
0bfdf32f | 3574 | && current_thread->last_resume_kind != resume_step |
e471f25b | 3575 | && ( |
1a981360 | 3576 | #if defined (USE_THREAD_DB) && !defined (__ANDROID__) |
fe978cb0 | 3577 | (current_process ()->priv->thread_db != NULL |
e471f25b PA |
3578 | && (WSTOPSIG (w) == __SIGRTMIN |
3579 | || WSTOPSIG (w) == __SIGRTMIN + 1)) | |
3580 | || | |
3581 | #endif | |
2ea28649 | 3582 | (pass_signals[gdb_signal_from_host (WSTOPSIG (w))] |
e471f25b | 3583 | && !(WSTOPSIG (w) == SIGSTOP |
c9587f88 AT |
3584 | && current_thread->last_resume_kind == resume_stop) |
3585 | && !linux_wstatus_maybe_breakpoint (w)))) | |
e471f25b PA |
3586 | { |
3587 | siginfo_t info, *info_p; | |
3588 | ||
3589 | if (debug_threads) | |
87ce2a04 | 3590 | debug_printf ("Ignored signal %d for LWP %ld.\n", |
0bfdf32f | 3591 | WSTOPSIG (w), lwpid_of (current_thread)); |
e471f25b | 3592 | |
0bfdf32f | 3593 | if (ptrace (PTRACE_GETSIGINFO, lwpid_of (current_thread), |
b8e1b30e | 3594 | (PTRACE_TYPE_ARG3) 0, &info) == 0) |
e471f25b PA |
3595 | info_p = &info; |
3596 | else | |
3597 | info_p = NULL; | |
863d01bd PA |
3598 | |
3599 | if (step_over_finished) | |
3600 | { | |
3601 | /* We cancelled this thread's step-over above. We still | |
3602 | need to unsuspend all other LWPs, and set them back | |
3603 | running again while the signal handler runs. */ | |
3604 | unsuspend_all_lwps (event_child); | |
3605 | ||
3606 | /* Enqueue the pending signal info so that proceed_all_lwps | |
3607 | doesn't lose it. */ | |
3608 | enqueue_pending_signal (event_child, WSTOPSIG (w), info_p); | |
3609 | ||
3610 | proceed_all_lwps (); | |
3611 | } | |
3612 | else | |
3613 | { | |
3614 | linux_resume_one_lwp (event_child, event_child->stepping, | |
3615 | WSTOPSIG (w), info_p); | |
3616 | } | |
edeeb602 YQ |
3617 | |
3618 | if (debug_threads) | |
3619 | debug_exit (); | |
3620 | ||
582511be | 3621 | return ignore_event (ourstatus); |
e471f25b PA |
3622 | } |
3623 | ||
c2d6af84 PA |
3624 | /* Note that all addresses are always "out of the step range" when |
3625 | there's no range to begin with. */ | |
3626 | in_step_range = lwp_in_step_range (event_child); | |
3627 | ||
3628 | /* If GDB wanted this thread to single step, and the thread is out | |
3629 | of the step range, we always want to report the SIGTRAP, and let | |
3630 | GDB handle it. Watchpoints should always be reported. So should | |
3631 | signals we can't explain. A SIGTRAP we can't explain could be a | |
3632 | GDB breakpoint --- we may or not support Z0 breakpoints. If we | |
3633 | do, we're be able to handle GDB breakpoints on top of internal | |
3634 | breakpoints, by handling the internal breakpoint and still | |
3635 | reporting the event to GDB. If we don't, we're out of luck, GDB | |
863d01bd PA |
3636 | won't see the breakpoint hit. If we see a single-step event but |
3637 | the thread should be continuing, don't pass the trap to gdb. | |
3638 | That indicates that we had previously finished a single-step but | |
3639 | left the single-step pending -- see | |
3640 | complete_ongoing_step_over. */ | |
6bf5e0ba | 3641 | report_to_gdb = (!maybe_internal_trap |
0bfdf32f | 3642 | || (current_thread->last_resume_kind == resume_step |
c2d6af84 | 3643 | && !in_step_range) |
15c66dd6 | 3644 | || event_child->stop_reason == TARGET_STOPPED_BY_WATCHPOINT |
863d01bd PA |
3645 | || (!in_step_range |
3646 | && !bp_explains_trap | |
3647 | && !trace_event | |
3648 | && !step_over_finished | |
3649 | && !(current_thread->last_resume_kind == resume_continue | |
3650 | && event_child->stop_reason == TARGET_STOPPED_BY_SINGLE_STEP)) | |
9f3a5c85 | 3651 | || (gdb_breakpoint_here (event_child->stop_pc) |
d3ce09f5 | 3652 | && gdb_condition_true_at_breakpoint (event_child->stop_pc) |
de0d863e | 3653 | && gdb_no_commands_at_breakpoint (event_child->stop_pc)) |
00db26fa | 3654 | || event_child->waitstatus.kind != TARGET_WAITKIND_IGNORE); |
d3ce09f5 SS |
3655 | |
3656 | run_breakpoint_commands (event_child->stop_pc); | |
6bf5e0ba PA |
3657 | |
3658 | /* We found no reason GDB would want us to stop. We either hit one | |
3659 | of our own breakpoints, or finished an internal step GDB | |
3660 | shouldn't know about. */ | |
3661 | if (!report_to_gdb) | |
3662 | { | |
3663 | if (debug_threads) | |
3664 | { | |
3665 | if (bp_explains_trap) | |
87ce2a04 | 3666 | debug_printf ("Hit a gdbserver breakpoint.\n"); |
6bf5e0ba | 3667 | if (step_over_finished) |
87ce2a04 | 3668 | debug_printf ("Step-over finished.\n"); |
219f2f23 | 3669 | if (trace_event) |
87ce2a04 | 3670 | debug_printf ("Tracepoint event.\n"); |
c2d6af84 | 3671 | if (lwp_in_step_range (event_child)) |
87ce2a04 DE |
3672 | debug_printf ("Range stepping pc 0x%s [0x%s, 0x%s).\n", |
3673 | paddress (event_child->stop_pc), | |
3674 | paddress (event_child->step_range_start), | |
3675 | paddress (event_child->step_range_end)); | |
6bf5e0ba PA |
3676 | } |
3677 | ||
3678 | /* We're not reporting this breakpoint to GDB, so apply the | |
3679 | decr_pc_after_break adjustment to the inferior's regcache | |
3680 | ourselves. */ | |
3681 | ||
3682 | if (the_low_target.set_pc != NULL) | |
3683 | { | |
3684 | struct regcache *regcache | |
0bfdf32f | 3685 | = get_thread_regcache (current_thread, 1); |
6bf5e0ba PA |
3686 | (*the_low_target.set_pc) (regcache, event_child->stop_pc); |
3687 | } | |
3688 | ||
7984d532 | 3689 | if (step_over_finished) |
e3652c84 YQ |
3690 | { |
3691 | /* If we have finished stepping over a breakpoint, we've | |
3692 | stopped and suspended all LWPs momentarily except the | |
3693 | stepping one. This is where we resume them all again. | |
3694 | We're going to keep waiting, so use proceed, which | |
3695 | handles stepping over the next breakpoint. */ | |
3696 | unsuspend_all_lwps (event_child); | |
3697 | } | |
3698 | else | |
3699 | { | |
3700 | /* Remove the single-step breakpoints if any. Note that | |
3701 | there isn't single-step breakpoint if we finished stepping | |
3702 | over. */ | |
3703 | if (can_software_single_step () | |
3704 | && has_single_step_breakpoints (current_thread)) | |
3705 | { | |
3706 | stop_all_lwps (0, event_child); | |
3707 | delete_single_step_breakpoints (current_thread); | |
3708 | unstop_all_lwps (0, event_child); | |
3709 | } | |
3710 | } | |
7984d532 | 3711 | |
e3652c84 YQ |
3712 | if (debug_threads) |
3713 | debug_printf ("proceeding all threads.\n"); | |
6bf5e0ba | 3714 | proceed_all_lwps (); |
edeeb602 YQ |
3715 | |
3716 | if (debug_threads) | |
3717 | debug_exit (); | |
3718 | ||
582511be | 3719 | return ignore_event (ourstatus); |
6bf5e0ba PA |
3720 | } |
3721 | ||
3722 | if (debug_threads) | |
3723 | { | |
00db26fa | 3724 | if (event_child->waitstatus.kind != TARGET_WAITKIND_IGNORE) |
ad071a30 PA |
3725 | { |
3726 | char *str; | |
3727 | ||
3728 | str = target_waitstatus_to_string (&event_child->waitstatus); | |
3729 | debug_printf ("LWP %ld: extended event with waitstatus %s\n", | |
3730 | lwpid_of (get_lwp_thread (event_child)), str); | |
3731 | xfree (str); | |
3732 | } | |
0bfdf32f | 3733 | if (current_thread->last_resume_kind == resume_step) |
c2d6af84 PA |
3734 | { |
3735 | if (event_child->step_range_start == event_child->step_range_end) | |
87ce2a04 | 3736 | debug_printf ("GDB wanted to single-step, reporting event.\n"); |
c2d6af84 | 3737 | else if (!lwp_in_step_range (event_child)) |
87ce2a04 | 3738 | debug_printf ("Out of step range, reporting event.\n"); |
c2d6af84 | 3739 | } |
15c66dd6 | 3740 | if (event_child->stop_reason == TARGET_STOPPED_BY_WATCHPOINT) |
87ce2a04 | 3741 | debug_printf ("Stopped by watchpoint.\n"); |
582511be | 3742 | else if (gdb_breakpoint_here (event_child->stop_pc)) |
87ce2a04 | 3743 | debug_printf ("Stopped by GDB breakpoint.\n"); |
6bf5e0ba | 3744 | if (debug_threads) |
87ce2a04 | 3745 | debug_printf ("Hit a non-gdbserver trap event.\n"); |
6bf5e0ba PA |
3746 | } |
3747 | ||
3748 | /* Alright, we're going to report a stop. */ | |
3749 | ||
3b9a79ef | 3750 | /* Remove single-step breakpoints. */ |
8901d193 YQ |
3751 | if (can_software_single_step ()) |
3752 | { | |
3b9a79ef | 3753 | /* Remove single-step breakpoints or not. It it is true, stop all |
8901d193 YQ |
3754 | lwps, so that other threads won't hit the breakpoint in the |
3755 | staled memory. */ | |
3b9a79ef | 3756 | int remove_single_step_breakpoints_p = 0; |
8901d193 YQ |
3757 | |
3758 | if (non_stop) | |
3759 | { | |
3b9a79ef YQ |
3760 | remove_single_step_breakpoints_p |
3761 | = has_single_step_breakpoints (current_thread); | |
8901d193 YQ |
3762 | } |
3763 | else | |
3764 | { | |
3765 | /* In all-stop, a stop reply cancels all previous resume | |
3b9a79ef | 3766 | requests. Delete all single-step breakpoints. */ |
8901d193 YQ |
3767 | struct inferior_list_entry *inf, *tmp; |
3768 | ||
3769 | ALL_INFERIORS (&all_threads, inf, tmp) | |
3770 | { | |
3771 | struct thread_info *thread = (struct thread_info *) inf; | |
3772 | ||
3b9a79ef | 3773 | if (has_single_step_breakpoints (thread)) |
8901d193 | 3774 | { |
3b9a79ef | 3775 | remove_single_step_breakpoints_p = 1; |
8901d193 YQ |
3776 | break; |
3777 | } | |
3778 | } | |
3779 | } | |
3780 | ||
3b9a79ef | 3781 | if (remove_single_step_breakpoints_p) |
8901d193 | 3782 | { |
3b9a79ef | 3783 | /* If we remove single-step breakpoints from memory, stop all lwps, |
8901d193 YQ |
3784 | so that other threads won't hit the breakpoint in the staled |
3785 | memory. */ | |
3786 | stop_all_lwps (0, event_child); | |
3787 | ||
3788 | if (non_stop) | |
3789 | { | |
3b9a79ef YQ |
3790 | gdb_assert (has_single_step_breakpoints (current_thread)); |
3791 | delete_single_step_breakpoints (current_thread); | |
8901d193 YQ |
3792 | } |
3793 | else | |
3794 | { | |
3795 | struct inferior_list_entry *inf, *tmp; | |
3796 | ||
3797 | ALL_INFERIORS (&all_threads, inf, tmp) | |
3798 | { | |
3799 | struct thread_info *thread = (struct thread_info *) inf; | |
3800 | ||
3b9a79ef YQ |
3801 | if (has_single_step_breakpoints (thread)) |
3802 | delete_single_step_breakpoints (thread); | |
8901d193 YQ |
3803 | } |
3804 | } | |
3805 | ||
3806 | unstop_all_lwps (0, event_child); | |
3807 | } | |
3808 | } | |
3809 | ||
582511be | 3810 | if (!stabilizing_threads) |
6bf5e0ba PA |
3811 | { |
3812 | /* In all-stop, stop all threads. */ | |
582511be PA |
3813 | if (!non_stop) |
3814 | stop_all_lwps (0, NULL); | |
6bf5e0ba | 3815 | |
c03e6ccc | 3816 | if (step_over_finished) |
582511be PA |
3817 | { |
3818 | if (!non_stop) | |
3819 | { | |
3820 | /* If we were doing a step-over, all other threads but | |
3821 | the stepping one had been paused in start_step_over, | |
3822 | with their suspend counts incremented. We don't want | |
3823 | to do a full unstop/unpause, because we're in | |
3824 | all-stop mode (so we want threads stopped), but we | |
3825 | still need to unsuspend the other threads, to | |
3826 | decrement their `suspended' count back. */ | |
3827 | unsuspend_all_lwps (event_child); | |
3828 | } | |
3829 | else | |
3830 | { | |
3831 | /* If we just finished a step-over, then all threads had | |
3832 | been momentarily paused. In all-stop, that's fine, | |
3833 | we want threads stopped by now anyway. In non-stop, | |
3834 | we need to re-resume threads that GDB wanted to be | |
3835 | running. */ | |
3836 | unstop_all_lwps (1, event_child); | |
3837 | } | |
3838 | } | |
c03e6ccc | 3839 | |
3aa5cfa0 AT |
3840 | /* If we're not waiting for a specific LWP, choose an event LWP |
3841 | from among those that have had events. Giving equal priority | |
3842 | to all LWPs that have had events helps prevent | |
3843 | starvation. */ | |
3844 | if (ptid_equal (ptid, minus_one_ptid)) | |
3845 | { | |
3846 | event_child->status_pending_p = 1; | |
3847 | event_child->status_pending = w; | |
3848 | ||
3849 | select_event_lwp (&event_child); | |
3850 | ||
3851 | /* current_thread and event_child must stay in sync. */ | |
3852 | current_thread = get_lwp_thread (event_child); | |
3853 | ||
3854 | event_child->status_pending_p = 0; | |
3855 | w = event_child->status_pending; | |
3856 | } | |
3857 | ||
3858 | ||
fa593d66 | 3859 | /* Stabilize threads (move out of jump pads). */ |
582511be PA |
3860 | if (!non_stop) |
3861 | stabilize_threads (); | |
6bf5e0ba PA |
3862 | } |
3863 | else | |
3864 | { | |
3865 | /* If we just finished a step-over, then all threads had been | |
3866 | momentarily paused. In all-stop, that's fine, we want | |
3867 | threads stopped by now anyway. In non-stop, we need to | |
3868 | re-resume threads that GDB wanted to be running. */ | |
3869 | if (step_over_finished) | |
7984d532 | 3870 | unstop_all_lwps (1, event_child); |
6bf5e0ba PA |
3871 | } |
3872 | ||
00db26fa | 3873 | if (event_child->waitstatus.kind != TARGET_WAITKIND_IGNORE) |
de0d863e | 3874 | { |
00db26fa PA |
3875 | /* If the reported event is an exit, fork, vfork or exec, let |
3876 | GDB know. */ | |
5a04c4cf PA |
3877 | |
3878 | /* Break the unreported fork relationship chain. */ | |
3879 | if (event_child->waitstatus.kind == TARGET_WAITKIND_FORKED | |
3880 | || event_child->waitstatus.kind == TARGET_WAITKIND_VFORKED) | |
3881 | { | |
3882 | event_child->fork_relative->fork_relative = NULL; | |
3883 | event_child->fork_relative = NULL; | |
3884 | } | |
3885 | ||
00db26fa | 3886 | *ourstatus = event_child->waitstatus; |
de0d863e DB |
3887 | /* Clear the event lwp's waitstatus since we handled it already. */ |
3888 | event_child->waitstatus.kind = TARGET_WAITKIND_IGNORE; | |
3889 | } | |
3890 | else | |
3891 | ourstatus->kind = TARGET_WAITKIND_STOPPED; | |
5b1c542e | 3892 | |
582511be | 3893 | /* Now that we've selected our final event LWP, un-adjust its PC if |
3e572f71 PA |
3894 | it was a software breakpoint, and the client doesn't know we can |
3895 | adjust the breakpoint ourselves. */ | |
3896 | if (event_child->stop_reason == TARGET_STOPPED_BY_SW_BREAKPOINT | |
3897 | && !swbreak_feature) | |
582511be PA |
3898 | { |
3899 | int decr_pc = the_low_target.decr_pc_after_break; | |
3900 | ||
3901 | if (decr_pc != 0) | |
3902 | { | |
3903 | struct regcache *regcache | |
3904 | = get_thread_regcache (current_thread, 1); | |
3905 | (*the_low_target.set_pc) (regcache, event_child->stop_pc + decr_pc); | |
3906 | } | |
3907 | } | |
3908 | ||
82075af2 JS |
3909 | if (WSTOPSIG (w) == SYSCALL_SIGTRAP) |
3910 | { | |
82075af2 | 3911 | get_syscall_trapinfo (event_child, |
4cc32bec | 3912 | &ourstatus->value.syscall_number); |
82075af2 JS |
3913 | ourstatus->kind = event_child->syscall_state; |
3914 | } | |
3915 | else if (current_thread->last_resume_kind == resume_stop | |
3916 | && WSTOPSIG (w) == SIGSTOP) | |
bd99dc85 PA |
3917 | { |
3918 | /* A thread that has been requested to stop by GDB with vCont;t, | |
3919 | and it stopped cleanly, so report as SIG0. The use of | |
3920 | SIGSTOP is an implementation detail. */ | |
a493e3e2 | 3921 | ourstatus->value.sig = GDB_SIGNAL_0; |
bd99dc85 | 3922 | } |
0bfdf32f | 3923 | else if (current_thread->last_resume_kind == resume_stop |
8336d594 | 3924 | && WSTOPSIG (w) != SIGSTOP) |
bd99dc85 PA |
3925 | { |
3926 | /* A thread that has been requested to stop by GDB with vCont;t, | |
d50171e4 | 3927 | but, it stopped for other reasons. */ |
2ea28649 | 3928 | ourstatus->value.sig = gdb_signal_from_host (WSTOPSIG (w)); |
bd99dc85 | 3929 | } |
de0d863e | 3930 | else if (ourstatus->kind == TARGET_WAITKIND_STOPPED) |
bd99dc85 | 3931 | { |
2ea28649 | 3932 | ourstatus->value.sig = gdb_signal_from_host (WSTOPSIG (w)); |
bd99dc85 PA |
3933 | } |
3934 | ||
d50171e4 PA |
3935 | gdb_assert (ptid_equal (step_over_bkpt, null_ptid)); |
3936 | ||
bd99dc85 | 3937 | if (debug_threads) |
87ce2a04 DE |
3938 | { |
3939 | debug_printf ("linux_wait_1 ret = %s, %d, %d\n", | |
0bfdf32f | 3940 | target_pid_to_str (ptid_of (current_thread)), |
87ce2a04 DE |
3941 | ourstatus->kind, ourstatus->value.sig); |
3942 | debug_exit (); | |
3943 | } | |
bd99dc85 | 3944 | |
65706a29 PA |
3945 | if (ourstatus->kind == TARGET_WAITKIND_EXITED) |
3946 | return filter_exit_event (event_child, ourstatus); | |
3947 | ||
0bfdf32f | 3948 | return ptid_of (current_thread); |
bd99dc85 PA |
3949 | } |
3950 | ||
3951 | /* Get rid of any pending event in the pipe. */ | |
3952 | static void | |
3953 | async_file_flush (void) | |
3954 | { | |
3955 | int ret; | |
3956 | char buf; | |
3957 | ||
3958 | do | |
3959 | ret = read (linux_event_pipe[0], &buf, 1); | |
3960 | while (ret >= 0 || (ret == -1 && errno == EINTR)); | |
3961 | } | |
3962 | ||
3963 | /* Put something in the pipe, so the event loop wakes up. */ | |
3964 | static void | |
3965 | async_file_mark (void) | |
3966 | { | |
3967 | int ret; | |
3968 | ||
3969 | async_file_flush (); | |
3970 | ||
3971 | do | |
3972 | ret = write (linux_event_pipe[1], "+", 1); | |
3973 | while (ret == 0 || (ret == -1 && errno == EINTR)); | |
3974 | ||
3975 | /* Ignore EAGAIN. If the pipe is full, the event loop will already | |
3976 | be awakened anyway. */ | |
3977 | } | |
3978 | ||
95954743 PA |
3979 | static ptid_t |
3980 | linux_wait (ptid_t ptid, | |
3981 | struct target_waitstatus *ourstatus, int target_options) | |
bd99dc85 | 3982 | { |
95954743 | 3983 | ptid_t event_ptid; |
bd99dc85 | 3984 | |
bd99dc85 PA |
3985 | /* Flush the async file first. */ |
3986 | if (target_is_async_p ()) | |
3987 | async_file_flush (); | |
3988 | ||
582511be PA |
3989 | do |
3990 | { | |
3991 | event_ptid = linux_wait_1 (ptid, ourstatus, target_options); | |
3992 | } | |
3993 | while ((target_options & TARGET_WNOHANG) == 0 | |
3994 | && ptid_equal (event_ptid, null_ptid) | |
3995 | && ourstatus->kind == TARGET_WAITKIND_IGNORE); | |
bd99dc85 PA |
3996 | |
3997 | /* If at least one stop was reported, there may be more. A single | |
3998 | SIGCHLD can signal more than one child stop. */ | |
3999 | if (target_is_async_p () | |
4000 | && (target_options & TARGET_WNOHANG) != 0 | |
95954743 | 4001 | && !ptid_equal (event_ptid, null_ptid)) |
bd99dc85 PA |
4002 | async_file_mark (); |
4003 | ||
4004 | return event_ptid; | |
da6d8c04 DJ |
4005 | } |
4006 | ||
c5f62d5f | 4007 | /* Send a signal to an LWP. */ |
fd500816 DJ |
4008 | |
4009 | static int | |
a1928bad | 4010 | kill_lwp (unsigned long lwpid, int signo) |
fd500816 | 4011 | { |
4a6ed09b | 4012 | int ret; |
fd500816 | 4013 | |
4a6ed09b PA |
4014 | errno = 0; |
4015 | ret = syscall (__NR_tkill, lwpid, signo); | |
4016 | if (errno == ENOSYS) | |
4017 | { | |
4018 | /* If tkill fails, then we are not using nptl threads, a | |
4019 | configuration we no longer support. */ | |
4020 | perror_with_name (("tkill")); | |
4021 | } | |
4022 | return ret; | |
fd500816 DJ |
4023 | } |
4024 | ||
964e4306 PA |
4025 | void |
4026 | linux_stop_lwp (struct lwp_info *lwp) | |
4027 | { | |
4028 | send_sigstop (lwp); | |
4029 | } | |
4030 | ||
0d62e5e8 | 4031 | static void |
02fc4de7 | 4032 | send_sigstop (struct lwp_info *lwp) |
0d62e5e8 | 4033 | { |
bd99dc85 | 4034 | int pid; |
0d62e5e8 | 4035 | |
d86d4aaf | 4036 | pid = lwpid_of (get_lwp_thread (lwp)); |
bd99dc85 | 4037 | |
0d62e5e8 DJ |
4038 | /* If we already have a pending stop signal for this process, don't |
4039 | send another. */ | |
54a0b537 | 4040 | if (lwp->stop_expected) |
0d62e5e8 | 4041 | { |
ae13219e | 4042 | if (debug_threads) |
87ce2a04 | 4043 | debug_printf ("Have pending sigstop for lwp %d\n", pid); |
ae13219e | 4044 | |
0d62e5e8 DJ |
4045 | return; |
4046 | } | |
4047 | ||
4048 | if (debug_threads) | |
87ce2a04 | 4049 | debug_printf ("Sending sigstop to lwp %d\n", pid); |
0d62e5e8 | 4050 | |
d50171e4 | 4051 | lwp->stop_expected = 1; |
bd99dc85 | 4052 | kill_lwp (pid, SIGSTOP); |
0d62e5e8 DJ |
4053 | } |
4054 | ||
7984d532 PA |
4055 | static int |
4056 | send_sigstop_callback (struct inferior_list_entry *entry, void *except) | |
02fc4de7 | 4057 | { |
d86d4aaf DE |
4058 | struct thread_info *thread = (struct thread_info *) entry; |
4059 | struct lwp_info *lwp = get_thread_lwp (thread); | |
02fc4de7 | 4060 | |
7984d532 PA |
4061 | /* Ignore EXCEPT. */ |
4062 | if (lwp == except) | |
4063 | return 0; | |
4064 | ||
02fc4de7 | 4065 | if (lwp->stopped) |
7984d532 | 4066 | return 0; |
02fc4de7 PA |
4067 | |
4068 | send_sigstop (lwp); | |
7984d532 PA |
4069 | return 0; |
4070 | } | |
4071 | ||
4072 | /* Increment the suspend count of an LWP, and stop it, if not stopped | |
4073 | yet. */ | |
4074 | static int | |
4075 | suspend_and_send_sigstop_callback (struct inferior_list_entry *entry, | |
4076 | void *except) | |
4077 | { | |
d86d4aaf DE |
4078 | struct thread_info *thread = (struct thread_info *) entry; |
4079 | struct lwp_info *lwp = get_thread_lwp (thread); | |
7984d532 PA |
4080 | |
4081 | /* Ignore EXCEPT. */ | |
4082 | if (lwp == except) | |
4083 | return 0; | |
4084 | ||
863d01bd | 4085 | lwp_suspended_inc (lwp); |
7984d532 PA |
4086 | |
4087 | return send_sigstop_callback (entry, except); | |
02fc4de7 PA |
4088 | } |
4089 | ||
95954743 PA |
4090 | static void |
4091 | mark_lwp_dead (struct lwp_info *lwp, int wstat) | |
4092 | { | |
95954743 PA |
4093 | /* Store the exit status for later. */ |
4094 | lwp->status_pending_p = 1; | |
4095 | lwp->status_pending = wstat; | |
4096 | ||
00db26fa PA |
4097 | /* Store in waitstatus as well, as there's nothing else to process |
4098 | for this event. */ | |
4099 | if (WIFEXITED (wstat)) | |
4100 | { | |
4101 | lwp->waitstatus.kind = TARGET_WAITKIND_EXITED; | |
4102 | lwp->waitstatus.value.integer = WEXITSTATUS (wstat); | |
4103 | } | |
4104 | else if (WIFSIGNALED (wstat)) | |
4105 | { | |
4106 | lwp->waitstatus.kind = TARGET_WAITKIND_SIGNALLED; | |
4107 | lwp->waitstatus.value.sig = gdb_signal_from_host (WTERMSIG (wstat)); | |
4108 | } | |
4109 | ||
95954743 PA |
4110 | /* Prevent trying to stop it. */ |
4111 | lwp->stopped = 1; | |
4112 | ||
4113 | /* No further stops are expected from a dead lwp. */ | |
4114 | lwp->stop_expected = 0; | |
4115 | } | |
4116 | ||
00db26fa PA |
4117 | /* Return true if LWP has exited already, and has a pending exit event |
4118 | to report to GDB. */ | |
4119 | ||
4120 | static int | |
4121 | lwp_is_marked_dead (struct lwp_info *lwp) | |
4122 | { | |
4123 | return (lwp->status_pending_p | |
4124 | && (WIFEXITED (lwp->status_pending) | |
4125 | || WIFSIGNALED (lwp->status_pending))); | |
4126 | } | |
4127 | ||
fa96cb38 PA |
4128 | /* Wait for all children to stop for the SIGSTOPs we just queued. */ |
4129 | ||
0d62e5e8 | 4130 | static void |
fa96cb38 | 4131 | wait_for_sigstop (void) |
0d62e5e8 | 4132 | { |
0bfdf32f | 4133 | struct thread_info *saved_thread; |
95954743 | 4134 | ptid_t saved_tid; |
fa96cb38 PA |
4135 | int wstat; |
4136 | int ret; | |
0d62e5e8 | 4137 | |
0bfdf32f GB |
4138 | saved_thread = current_thread; |
4139 | if (saved_thread != NULL) | |
4140 | saved_tid = saved_thread->entry.id; | |
bd99dc85 | 4141 | else |
95954743 | 4142 | saved_tid = null_ptid; /* avoid bogus unused warning */ |
bd99dc85 | 4143 | |
d50171e4 | 4144 | if (debug_threads) |
fa96cb38 | 4145 | debug_printf ("wait_for_sigstop: pulling events\n"); |
d50171e4 | 4146 | |
fa96cb38 PA |
4147 | /* Passing NULL_PTID as filter indicates we want all events to be |
4148 | left pending. Eventually this returns when there are no | |
4149 | unwaited-for children left. */ | |
4150 | ret = linux_wait_for_event_filtered (minus_one_ptid, null_ptid, | |
4151 | &wstat, __WALL); | |
4152 | gdb_assert (ret == -1); | |
0d62e5e8 | 4153 | |
0bfdf32f GB |
4154 | if (saved_thread == NULL || linux_thread_alive (saved_tid)) |
4155 | current_thread = saved_thread; | |
0d62e5e8 DJ |
4156 | else |
4157 | { | |
4158 | if (debug_threads) | |
87ce2a04 | 4159 | debug_printf ("Previously current thread died.\n"); |
0d62e5e8 | 4160 | |
f0db101d PA |
4161 | /* We can't change the current inferior behind GDB's back, |
4162 | otherwise, a subsequent command may apply to the wrong | |
4163 | process. */ | |
4164 | current_thread = NULL; | |
0d62e5e8 DJ |
4165 | } |
4166 | } | |
4167 | ||
fa593d66 PA |
4168 | /* Returns true if LWP ENTRY is stopped in a jump pad, and we can't |
4169 | move it out, because we need to report the stop event to GDB. For | |
4170 | example, if the user puts a breakpoint in the jump pad, it's | |
4171 | because she wants to debug it. */ | |
4172 | ||
4173 | static int | |
4174 | stuck_in_jump_pad_callback (struct inferior_list_entry *entry, void *data) | |
4175 | { | |
d86d4aaf DE |
4176 | struct thread_info *thread = (struct thread_info *) entry; |
4177 | struct lwp_info *lwp = get_thread_lwp (thread); | |
fa593d66 | 4178 | |
863d01bd PA |
4179 | if (lwp->suspended != 0) |
4180 | { | |
4181 | internal_error (__FILE__, __LINE__, | |
4182 | "LWP %ld is suspended, suspended=%d\n", | |
4183 | lwpid_of (thread), lwp->suspended); | |
4184 | } | |
fa593d66 PA |
4185 | gdb_assert (lwp->stopped); |
4186 | ||
4187 | /* Allow debugging the jump pad, gdb_collect, etc.. */ | |
4188 | return (supports_fast_tracepoints () | |
58b4daa5 | 4189 | && agent_loaded_p () |
fa593d66 | 4190 | && (gdb_breakpoint_here (lwp->stop_pc) |
15c66dd6 | 4191 | || lwp->stop_reason == TARGET_STOPPED_BY_WATCHPOINT |
fa593d66 PA |
4192 | || thread->last_resume_kind == resume_step) |
4193 | && linux_fast_tracepoint_collecting (lwp, NULL)); | |
4194 | } | |
4195 | ||
4196 | static void | |
4197 | move_out_of_jump_pad_callback (struct inferior_list_entry *entry) | |
4198 | { | |
d86d4aaf | 4199 | struct thread_info *thread = (struct thread_info *) entry; |
f0ce0d3a | 4200 | struct thread_info *saved_thread; |
d86d4aaf | 4201 | struct lwp_info *lwp = get_thread_lwp (thread); |
fa593d66 PA |
4202 | int *wstat; |
4203 | ||
863d01bd PA |
4204 | if (lwp->suspended != 0) |
4205 | { | |
4206 | internal_error (__FILE__, __LINE__, | |
4207 | "LWP %ld is suspended, suspended=%d\n", | |
4208 | lwpid_of (thread), lwp->suspended); | |
4209 | } | |
fa593d66 PA |
4210 | gdb_assert (lwp->stopped); |
4211 | ||
f0ce0d3a PA |
4212 | /* For gdb_breakpoint_here. */ |
4213 | saved_thread = current_thread; | |
4214 | current_thread = thread; | |
4215 | ||
fa593d66 PA |
4216 | wstat = lwp->status_pending_p ? &lwp->status_pending : NULL; |
4217 | ||
4218 | /* Allow debugging the jump pad, gdb_collect, etc. */ | |
4219 | if (!gdb_breakpoint_here (lwp->stop_pc) | |
15c66dd6 | 4220 | && lwp->stop_reason != TARGET_STOPPED_BY_WATCHPOINT |
fa593d66 PA |
4221 | && thread->last_resume_kind != resume_step |
4222 | && maybe_move_out_of_jump_pad (lwp, wstat)) | |
4223 | { | |
4224 | if (debug_threads) | |
87ce2a04 | 4225 | debug_printf ("LWP %ld needs stabilizing (in jump pad)\n", |
d86d4aaf | 4226 | lwpid_of (thread)); |
fa593d66 PA |
4227 | |
4228 | if (wstat) | |
4229 | { | |
4230 | lwp->status_pending_p = 0; | |
4231 | enqueue_one_deferred_signal (lwp, wstat); | |
4232 | ||
4233 | if (debug_threads) | |
87ce2a04 DE |
4234 | debug_printf ("Signal %d for LWP %ld deferred " |
4235 | "(in jump pad)\n", | |
d86d4aaf | 4236 | WSTOPSIG (*wstat), lwpid_of (thread)); |
fa593d66 PA |
4237 | } |
4238 | ||
4239 | linux_resume_one_lwp (lwp, 0, 0, NULL); | |
4240 | } | |
4241 | else | |
863d01bd | 4242 | lwp_suspended_inc (lwp); |
f0ce0d3a PA |
4243 | |
4244 | current_thread = saved_thread; | |
fa593d66 PA |
4245 | } |
4246 | ||
4247 | static int | |
4248 | lwp_running (struct inferior_list_entry *entry, void *data) | |
4249 | { | |
d86d4aaf DE |
4250 | struct thread_info *thread = (struct thread_info *) entry; |
4251 | struct lwp_info *lwp = get_thread_lwp (thread); | |
fa593d66 | 4252 | |
00db26fa | 4253 | if (lwp_is_marked_dead (lwp)) |
fa593d66 PA |
4254 | return 0; |
4255 | if (lwp->stopped) | |
4256 | return 0; | |
4257 | return 1; | |
4258 | } | |
4259 | ||
7984d532 PA |
4260 | /* Stop all lwps that aren't stopped yet, except EXCEPT, if not NULL. |
4261 | If SUSPEND, then also increase the suspend count of every LWP, | |
4262 | except EXCEPT. */ | |
4263 | ||
0d62e5e8 | 4264 | static void |
7984d532 | 4265 | stop_all_lwps (int suspend, struct lwp_info *except) |
0d62e5e8 | 4266 | { |
bde24c0a PA |
4267 | /* Should not be called recursively. */ |
4268 | gdb_assert (stopping_threads == NOT_STOPPING_THREADS); | |
4269 | ||
87ce2a04 DE |
4270 | if (debug_threads) |
4271 | { | |
4272 | debug_enter (); | |
4273 | debug_printf ("stop_all_lwps (%s, except=%s)\n", | |
4274 | suspend ? "stop-and-suspend" : "stop", | |
4275 | except != NULL | |
d86d4aaf | 4276 | ? target_pid_to_str (ptid_of (get_lwp_thread (except))) |
87ce2a04 DE |
4277 | : "none"); |
4278 | } | |
4279 | ||
bde24c0a PA |
4280 | stopping_threads = (suspend |
4281 | ? STOPPING_AND_SUSPENDING_THREADS | |
4282 | : STOPPING_THREADS); | |
7984d532 PA |
4283 | |
4284 | if (suspend) | |
d86d4aaf | 4285 | find_inferior (&all_threads, suspend_and_send_sigstop_callback, except); |
7984d532 | 4286 | else |
d86d4aaf | 4287 | find_inferior (&all_threads, send_sigstop_callback, except); |
fa96cb38 | 4288 | wait_for_sigstop (); |
bde24c0a | 4289 | stopping_threads = NOT_STOPPING_THREADS; |
87ce2a04 DE |
4290 | |
4291 | if (debug_threads) | |
4292 | { | |
4293 | debug_printf ("stop_all_lwps done, setting stopping_threads " | |
4294 | "back to !stopping\n"); | |
4295 | debug_exit (); | |
4296 | } | |
0d62e5e8 DJ |
4297 | } |
4298 | ||
863d01bd PA |
4299 | /* Enqueue one signal in the chain of signals which need to be |
4300 | delivered to this process on next resume. */ | |
4301 | ||
4302 | static void | |
4303 | enqueue_pending_signal (struct lwp_info *lwp, int signal, siginfo_t *info) | |
4304 | { | |
8d749320 | 4305 | struct pending_signals *p_sig = XNEW (struct pending_signals); |
863d01bd | 4306 | |
863d01bd PA |
4307 | p_sig->prev = lwp->pending_signals; |
4308 | p_sig->signal = signal; | |
4309 | if (info == NULL) | |
4310 | memset (&p_sig->info, 0, sizeof (siginfo_t)); | |
4311 | else | |
4312 | memcpy (&p_sig->info, info, sizeof (siginfo_t)); | |
4313 | lwp->pending_signals = p_sig; | |
4314 | } | |
4315 | ||
fa5308bd AT |
4316 | /* Install breakpoints for software single stepping. */ |
4317 | ||
4318 | static void | |
4319 | install_software_single_step_breakpoints (struct lwp_info *lwp) | |
4320 | { | |
4321 | int i; | |
4322 | CORE_ADDR pc; | |
984a2c04 YQ |
4323 | struct thread_info *thread = get_lwp_thread (lwp); |
4324 | struct regcache *regcache = get_thread_regcache (thread, 1); | |
fa5308bd | 4325 | VEC (CORE_ADDR) *next_pcs = NULL; |
984a2c04 YQ |
4326 | struct cleanup *old_chain = make_cleanup_restore_current_thread (); |
4327 | ||
4328 | make_cleanup (VEC_cleanup (CORE_ADDR), &next_pcs); | |
fa5308bd | 4329 | |
984a2c04 | 4330 | current_thread = thread; |
4d18591b | 4331 | next_pcs = (*the_low_target.get_next_pcs) (regcache); |
fa5308bd AT |
4332 | |
4333 | for (i = 0; VEC_iterate (CORE_ADDR, next_pcs, i, pc); ++i) | |
3b9a79ef | 4334 | set_single_step_breakpoint (pc, current_ptid); |
fa5308bd AT |
4335 | |
4336 | do_cleanups (old_chain); | |
4337 | } | |
4338 | ||
7fe5e27e AT |
4339 | /* Single step via hardware or software single step. |
4340 | Return 1 if hardware single stepping, 0 if software single stepping | |
4341 | or can't single step. */ | |
4342 | ||
4343 | static int | |
4344 | single_step (struct lwp_info* lwp) | |
4345 | { | |
4346 | int step = 0; | |
4347 | ||
4348 | if (can_hardware_single_step ()) | |
4349 | { | |
4350 | step = 1; | |
4351 | } | |
4352 | else if (can_software_single_step ()) | |
4353 | { | |
4354 | install_software_single_step_breakpoints (lwp); | |
4355 | step = 0; | |
4356 | } | |
4357 | else | |
4358 | { | |
4359 | if (debug_threads) | |
4360 | debug_printf ("stepping is not implemented on this target"); | |
4361 | } | |
4362 | ||
4363 | return step; | |
4364 | } | |
4365 | ||
35ac8b3e | 4366 | /* The signal can be delivered to the inferior if we are not trying to |
5b061e98 YQ |
4367 | finish a fast tracepoint collect. Since signal can be delivered in |
4368 | the step-over, the program may go to signal handler and trap again | |
4369 | after return from the signal handler. We can live with the spurious | |
4370 | double traps. */ | |
35ac8b3e YQ |
4371 | |
4372 | static int | |
4373 | lwp_signal_can_be_delivered (struct lwp_info *lwp) | |
4374 | { | |
484b3c32 | 4375 | return !lwp->collecting_fast_tracepoint; |
35ac8b3e YQ |
4376 | } |
4377 | ||
23f238d3 PA |
4378 | /* Resume execution of LWP. If STEP is nonzero, single-step it. If |
4379 | SIGNAL is nonzero, give it that signal. */ | |
da6d8c04 | 4380 | |
ce3a066d | 4381 | static void |
23f238d3 PA |
4382 | linux_resume_one_lwp_throw (struct lwp_info *lwp, |
4383 | int step, int signal, siginfo_t *info) | |
da6d8c04 | 4384 | { |
d86d4aaf | 4385 | struct thread_info *thread = get_lwp_thread (lwp); |
0bfdf32f | 4386 | struct thread_info *saved_thread; |
fa593d66 | 4387 | int fast_tp_collecting; |
82075af2 | 4388 | int ptrace_request; |
c06cbd92 YQ |
4389 | struct process_info *proc = get_thread_process (thread); |
4390 | ||
4391 | /* Note that target description may not be initialised | |
4392 | (proc->tdesc == NULL) at this point because the program hasn't | |
4393 | stopped at the first instruction yet. It means GDBserver skips | |
4394 | the extra traps from the wrapper program (see option --wrapper). | |
4395 | Code in this function that requires register access should be | |
4396 | guarded by proc->tdesc == NULL or something else. */ | |
0d62e5e8 | 4397 | |
54a0b537 | 4398 | if (lwp->stopped == 0) |
0d62e5e8 DJ |
4399 | return; |
4400 | ||
65706a29 PA |
4401 | gdb_assert (lwp->waitstatus.kind == TARGET_WAITKIND_IGNORE); |
4402 | ||
fa593d66 PA |
4403 | fast_tp_collecting = lwp->collecting_fast_tracepoint; |
4404 | ||
4405 | gdb_assert (!stabilizing_threads || fast_tp_collecting); | |
4406 | ||
219f2f23 PA |
4407 | /* Cancel actions that rely on GDB not changing the PC (e.g., the |
4408 | user used the "jump" command, or "set $pc = foo"). */ | |
c06cbd92 | 4409 | if (thread->while_stepping != NULL && lwp->stop_pc != get_pc (lwp)) |
219f2f23 PA |
4410 | { |
4411 | /* Collecting 'while-stepping' actions doesn't make sense | |
4412 | anymore. */ | |
d86d4aaf | 4413 | release_while_stepping_state_list (thread); |
219f2f23 PA |
4414 | } |
4415 | ||
0d62e5e8 | 4416 | /* If we have pending signals or status, and a new signal, enqueue the |
35ac8b3e YQ |
4417 | signal. Also enqueue the signal if it can't be delivered to the |
4418 | inferior right now. */ | |
0d62e5e8 | 4419 | if (signal != 0 |
fa593d66 PA |
4420 | && (lwp->status_pending_p |
4421 | || lwp->pending_signals != NULL | |
35ac8b3e | 4422 | || !lwp_signal_can_be_delivered (lwp))) |
94610ec4 YQ |
4423 | { |
4424 | enqueue_pending_signal (lwp, signal, info); | |
4425 | ||
4426 | /* Postpone any pending signal. It was enqueued above. */ | |
4427 | signal = 0; | |
4428 | } | |
0d62e5e8 | 4429 | |
d50171e4 PA |
4430 | if (lwp->status_pending_p) |
4431 | { | |
4432 | if (debug_threads) | |
94610ec4 | 4433 | debug_printf ("Not resuming lwp %ld (%s, stop %s);" |
87ce2a04 | 4434 | " has pending status\n", |
94610ec4 | 4435 | lwpid_of (thread), step ? "step" : "continue", |
87ce2a04 | 4436 | lwp->stop_expected ? "expected" : "not expected"); |
d50171e4 PA |
4437 | return; |
4438 | } | |
0d62e5e8 | 4439 | |
0bfdf32f GB |
4440 | saved_thread = current_thread; |
4441 | current_thread = thread; | |
0d62e5e8 | 4442 | |
0d62e5e8 DJ |
4443 | /* This bit needs some thinking about. If we get a signal that |
4444 | we must report while a single-step reinsert is still pending, | |
4445 | we often end up resuming the thread. It might be better to | |
4446 | (ew) allow a stack of pending events; then we could be sure that | |
4447 | the reinsert happened right away and not lose any signals. | |
4448 | ||
4449 | Making this stack would also shrink the window in which breakpoints are | |
54a0b537 | 4450 | uninserted (see comment in linux_wait_for_lwp) but not enough for |
0d62e5e8 DJ |
4451 | complete correctness, so it won't solve that problem. It may be |
4452 | worthwhile just to solve this one, however. */ | |
54a0b537 | 4453 | if (lwp->bp_reinsert != 0) |
0d62e5e8 DJ |
4454 | { |
4455 | if (debug_threads) | |
87ce2a04 DE |
4456 | debug_printf (" pending reinsert at 0x%s\n", |
4457 | paddress (lwp->bp_reinsert)); | |
d50171e4 | 4458 | |
85e00e85 | 4459 | if (can_hardware_single_step ()) |
d50171e4 | 4460 | { |
fa593d66 PA |
4461 | if (fast_tp_collecting == 0) |
4462 | { | |
4463 | if (step == 0) | |
4464 | fprintf (stderr, "BAD - reinserting but not stepping.\n"); | |
4465 | if (lwp->suspended) | |
4466 | fprintf (stderr, "BAD - reinserting and suspended(%d).\n", | |
4467 | lwp->suspended); | |
4468 | } | |
d50171e4 | 4469 | } |
f79b145d YQ |
4470 | |
4471 | step = maybe_hw_step (thread); | |
0d62e5e8 DJ |
4472 | } |
4473 | ||
fa593d66 PA |
4474 | if (fast_tp_collecting == 1) |
4475 | { | |
4476 | if (debug_threads) | |
87ce2a04 DE |
4477 | debug_printf ("lwp %ld wants to get out of fast tracepoint jump pad" |
4478 | " (exit-jump-pad-bkpt)\n", | |
d86d4aaf | 4479 | lwpid_of (thread)); |
fa593d66 PA |
4480 | } |
4481 | else if (fast_tp_collecting == 2) | |
4482 | { | |
4483 | if (debug_threads) | |
87ce2a04 DE |
4484 | debug_printf ("lwp %ld wants to get out of fast tracepoint jump pad" |
4485 | " single-stepping\n", | |
d86d4aaf | 4486 | lwpid_of (thread)); |
fa593d66 PA |
4487 | |
4488 | if (can_hardware_single_step ()) | |
4489 | step = 1; | |
4490 | else | |
38e08fca GB |
4491 | { |
4492 | internal_error (__FILE__, __LINE__, | |
4493 | "moving out of jump pad single-stepping" | |
4494 | " not implemented on this target"); | |
4495 | } | |
fa593d66 PA |
4496 | } |
4497 | ||
219f2f23 PA |
4498 | /* If we have while-stepping actions in this thread set it stepping. |
4499 | If we have a signal to deliver, it may or may not be set to | |
4500 | SIG_IGN, we don't know. Assume so, and allow collecting | |
4501 | while-stepping into a signal handler. A possible smart thing to | |
4502 | do would be to set an internal breakpoint at the signal return | |
4503 | address, continue, and carry on catching this while-stepping | |
4504 | action only when that breakpoint is hit. A future | |
4505 | enhancement. */ | |
7fe5e27e | 4506 | if (thread->while_stepping != NULL) |
219f2f23 PA |
4507 | { |
4508 | if (debug_threads) | |
87ce2a04 | 4509 | debug_printf ("lwp %ld has a while-stepping action -> forcing step.\n", |
d86d4aaf | 4510 | lwpid_of (thread)); |
7fe5e27e AT |
4511 | |
4512 | step = single_step (lwp); | |
219f2f23 PA |
4513 | } |
4514 | ||
c06cbd92 | 4515 | if (proc->tdesc != NULL && the_low_target.get_pc != NULL) |
0d62e5e8 | 4516 | { |
0bfdf32f | 4517 | struct regcache *regcache = get_thread_regcache (current_thread, 1); |
582511be PA |
4518 | |
4519 | lwp->stop_pc = (*the_low_target.get_pc) (regcache); | |
4520 | ||
4521 | if (debug_threads) | |
4522 | { | |
4523 | debug_printf (" %s from pc 0x%lx\n", step ? "step" : "continue", | |
4524 | (long) lwp->stop_pc); | |
4525 | } | |
0d62e5e8 DJ |
4526 | } |
4527 | ||
35ac8b3e YQ |
4528 | /* If we have pending signals, consume one if it can be delivered to |
4529 | the inferior. */ | |
4530 | if (lwp->pending_signals != NULL && lwp_signal_can_be_delivered (lwp)) | |
0d62e5e8 DJ |
4531 | { |
4532 | struct pending_signals **p_sig; | |
4533 | ||
54a0b537 | 4534 | p_sig = &lwp->pending_signals; |
0d62e5e8 DJ |
4535 | while ((*p_sig)->prev != NULL) |
4536 | p_sig = &(*p_sig)->prev; | |
4537 | ||
4538 | signal = (*p_sig)->signal; | |
32ca6d61 | 4539 | if ((*p_sig)->info.si_signo != 0) |
d86d4aaf | 4540 | ptrace (PTRACE_SETSIGINFO, lwpid_of (thread), (PTRACE_TYPE_ARG3) 0, |
56f7af9c | 4541 | &(*p_sig)->info); |
32ca6d61 | 4542 | |
0d62e5e8 DJ |
4543 | free (*p_sig); |
4544 | *p_sig = NULL; | |
4545 | } | |
4546 | ||
94610ec4 YQ |
4547 | if (debug_threads) |
4548 | debug_printf ("Resuming lwp %ld (%s, signal %d, stop %s)\n", | |
4549 | lwpid_of (thread), step ? "step" : "continue", signal, | |
4550 | lwp->stop_expected ? "expected" : "not expected"); | |
4551 | ||
aa5ca48f DE |
4552 | if (the_low_target.prepare_to_resume != NULL) |
4553 | the_low_target.prepare_to_resume (lwp); | |
4554 | ||
d86d4aaf | 4555 | regcache_invalidate_thread (thread); |
da6d8c04 | 4556 | errno = 0; |
54a0b537 | 4557 | lwp->stepping = step; |
82075af2 JS |
4558 | if (step) |
4559 | ptrace_request = PTRACE_SINGLESTEP; | |
4560 | else if (gdb_catching_syscalls_p (lwp)) | |
4561 | ptrace_request = PTRACE_SYSCALL; | |
4562 | else | |
4563 | ptrace_request = PTRACE_CONT; | |
4564 | ptrace (ptrace_request, | |
4565 | lwpid_of (thread), | |
b8e1b30e | 4566 | (PTRACE_TYPE_ARG3) 0, |
14ce3065 DE |
4567 | /* Coerce to a uintptr_t first to avoid potential gcc warning |
4568 | of coercing an 8 byte integer to a 4 byte pointer. */ | |
b8e1b30e | 4569 | (PTRACE_TYPE_ARG4) (uintptr_t) signal); |
0d62e5e8 | 4570 | |
0bfdf32f | 4571 | current_thread = saved_thread; |
da6d8c04 | 4572 | if (errno) |
23f238d3 PA |
4573 | perror_with_name ("resuming thread"); |
4574 | ||
4575 | /* Successfully resumed. Clear state that no longer makes sense, | |
4576 | and mark the LWP as running. Must not do this before resuming | |
4577 | otherwise if that fails other code will be confused. E.g., we'd | |
4578 | later try to stop the LWP and hang forever waiting for a stop | |
4579 | status. Note that we must not throw after this is cleared, | |
4580 | otherwise handle_zombie_lwp_error would get confused. */ | |
4581 | lwp->stopped = 0; | |
4582 | lwp->stop_reason = TARGET_STOPPED_BY_NO_REASON; | |
4583 | } | |
4584 | ||
4585 | /* Called when we try to resume a stopped LWP and that errors out. If | |
4586 | the LWP is no longer in ptrace-stopped state (meaning it's zombie, | |
4587 | or about to become), discard the error, clear any pending status | |
4588 | the LWP may have, and return true (we'll collect the exit status | |
4589 | soon enough). Otherwise, return false. */ | |
4590 | ||
4591 | static int | |
4592 | check_ptrace_stopped_lwp_gone (struct lwp_info *lp) | |
4593 | { | |
4594 | struct thread_info *thread = get_lwp_thread (lp); | |
4595 | ||
4596 | /* If we get an error after resuming the LWP successfully, we'd | |
4597 | confuse !T state for the LWP being gone. */ | |
4598 | gdb_assert (lp->stopped); | |
4599 | ||
4600 | /* We can't just check whether the LWP is in 'Z (Zombie)' state, | |
4601 | because even if ptrace failed with ESRCH, the tracee may be "not | |
4602 | yet fully dead", but already refusing ptrace requests. In that | |
4603 | case the tracee has 'R (Running)' state for a little bit | |
4604 | (observed in Linux 3.18). See also the note on ESRCH in the | |
4605 | ptrace(2) man page. Instead, check whether the LWP has any state | |
4606 | other than ptrace-stopped. */ | |
4607 | ||
4608 | /* Don't assume anything if /proc/PID/status can't be read. */ | |
4609 | if (linux_proc_pid_is_trace_stopped_nowarn (lwpid_of (thread)) == 0) | |
3221518c | 4610 | { |
23f238d3 PA |
4611 | lp->stop_reason = TARGET_STOPPED_BY_NO_REASON; |
4612 | lp->status_pending_p = 0; | |
4613 | return 1; | |
4614 | } | |
4615 | return 0; | |
4616 | } | |
4617 | ||
4618 | /* Like linux_resume_one_lwp_throw, but no error is thrown if the LWP | |
4619 | disappears while we try to resume it. */ | |
3221518c | 4620 | |
23f238d3 PA |
4621 | static void |
4622 | linux_resume_one_lwp (struct lwp_info *lwp, | |
4623 | int step, int signal, siginfo_t *info) | |
4624 | { | |
4625 | TRY | |
4626 | { | |
4627 | linux_resume_one_lwp_throw (lwp, step, signal, info); | |
4628 | } | |
4629 | CATCH (ex, RETURN_MASK_ERROR) | |
4630 | { | |
4631 | if (!check_ptrace_stopped_lwp_gone (lwp)) | |
4632 | throw_exception (ex); | |
3221518c | 4633 | } |
23f238d3 | 4634 | END_CATCH |
da6d8c04 DJ |
4635 | } |
4636 | ||
2bd7c093 PA |
4637 | struct thread_resume_array |
4638 | { | |
4639 | struct thread_resume *resume; | |
4640 | size_t n; | |
4641 | }; | |
64386c31 | 4642 | |
ebcf782c DE |
4643 | /* This function is called once per thread via find_inferior. |
4644 | ARG is a pointer to a thread_resume_array struct. | |
4645 | We look up the thread specified by ENTRY in ARG, and mark the thread | |
4646 | with a pointer to the appropriate resume request. | |
5544ad89 DJ |
4647 | |
4648 | This algorithm is O(threads * resume elements), but resume elements | |
4649 | is small (and will remain small at least until GDB supports thread | |
4650 | suspension). */ | |
ebcf782c | 4651 | |
2bd7c093 PA |
4652 | static int |
4653 | linux_set_resume_request (struct inferior_list_entry *entry, void *arg) | |
0d62e5e8 | 4654 | { |
d86d4aaf DE |
4655 | struct thread_info *thread = (struct thread_info *) entry; |
4656 | struct lwp_info *lwp = get_thread_lwp (thread); | |
5544ad89 | 4657 | int ndx; |
2bd7c093 | 4658 | struct thread_resume_array *r; |
64386c31 | 4659 | |
9a3c8263 | 4660 | r = (struct thread_resume_array *) arg; |
64386c31 | 4661 | |
2bd7c093 | 4662 | for (ndx = 0; ndx < r->n; ndx++) |
95954743 PA |
4663 | { |
4664 | ptid_t ptid = r->resume[ndx].thread; | |
4665 | if (ptid_equal (ptid, minus_one_ptid) | |
4666 | || ptid_equal (ptid, entry->id) | |
0c9070b3 YQ |
4667 | /* Handle both 'pPID' and 'pPID.-1' as meaning 'all threads |
4668 | of PID'. */ | |
d86d4aaf | 4669 | || (ptid_get_pid (ptid) == pid_of (thread) |
0c9070b3 YQ |
4670 | && (ptid_is_pid (ptid) |
4671 | || ptid_get_lwp (ptid) == -1))) | |
95954743 | 4672 | { |
d50171e4 | 4673 | if (r->resume[ndx].kind == resume_stop |
8336d594 | 4674 | && thread->last_resume_kind == resume_stop) |
d50171e4 PA |
4675 | { |
4676 | if (debug_threads) | |
87ce2a04 DE |
4677 | debug_printf ("already %s LWP %ld at GDB's request\n", |
4678 | (thread->last_status.kind | |
4679 | == TARGET_WAITKIND_STOPPED) | |
4680 | ? "stopped" | |
4681 | : "stopping", | |
d86d4aaf | 4682 | lwpid_of (thread)); |
d50171e4 PA |
4683 | |
4684 | continue; | |
4685 | } | |
4686 | ||
5a04c4cf PA |
4687 | /* Ignore (wildcard) resume requests for already-resumed |
4688 | threads. */ | |
4689 | if (r->resume[ndx].kind != resume_stop | |
4690 | && thread->last_resume_kind != resume_stop) | |
4691 | { | |
4692 | if (debug_threads) | |
4693 | debug_printf ("already %s LWP %ld at GDB's request\n", | |
4694 | (thread->last_resume_kind | |
4695 | == resume_step) | |
4696 | ? "stepping" | |
4697 | : "continuing", | |
4698 | lwpid_of (thread)); | |
4699 | continue; | |
4700 | } | |
4701 | ||
4702 | /* Don't let wildcard resumes resume fork children that GDB | |
4703 | does not yet know are new fork children. */ | |
4704 | if (lwp->fork_relative != NULL) | |
4705 | { | |
4706 | struct inferior_list_entry *inf, *tmp; | |
4707 | struct lwp_info *rel = lwp->fork_relative; | |
4708 | ||
4709 | if (rel->status_pending_p | |
4710 | && (rel->waitstatus.kind == TARGET_WAITKIND_FORKED | |
4711 | || rel->waitstatus.kind == TARGET_WAITKIND_VFORKED)) | |
4712 | { | |
4713 | if (debug_threads) | |
4714 | debug_printf ("not resuming LWP %ld: has queued stop reply\n", | |
4715 | lwpid_of (thread)); | |
4716 | continue; | |
4717 | } | |
4718 | } | |
4719 | ||
4720 | /* If the thread has a pending event that has already been | |
4721 | reported to GDBserver core, but GDB has not pulled the | |
4722 | event out of the vStopped queue yet, likewise, ignore the | |
4723 | (wildcard) resume request. */ | |
4724 | if (in_queued_stop_replies (entry->id)) | |
4725 | { | |
4726 | if (debug_threads) | |
4727 | debug_printf ("not resuming LWP %ld: has queued stop reply\n", | |
4728 | lwpid_of (thread)); | |
4729 | continue; | |
4730 | } | |
4731 | ||
95954743 | 4732 | lwp->resume = &r->resume[ndx]; |
8336d594 | 4733 | thread->last_resume_kind = lwp->resume->kind; |
fa593d66 | 4734 | |
c2d6af84 PA |
4735 | lwp->step_range_start = lwp->resume->step_range_start; |
4736 | lwp->step_range_end = lwp->resume->step_range_end; | |
4737 | ||
fa593d66 PA |
4738 | /* If we had a deferred signal to report, dequeue one now. |
4739 | This can happen if LWP gets more than one signal while | |
4740 | trying to get out of a jump pad. */ | |
4741 | if (lwp->stopped | |
4742 | && !lwp->status_pending_p | |
4743 | && dequeue_one_deferred_signal (lwp, &lwp->status_pending)) | |
4744 | { | |
4745 | lwp->status_pending_p = 1; | |
4746 | ||
4747 | if (debug_threads) | |
87ce2a04 DE |
4748 | debug_printf ("Dequeueing deferred signal %d for LWP %ld, " |
4749 | "leaving status pending.\n", | |
d86d4aaf DE |
4750 | WSTOPSIG (lwp->status_pending), |
4751 | lwpid_of (thread)); | |
fa593d66 PA |
4752 | } |
4753 | ||
95954743 PA |
4754 | return 0; |
4755 | } | |
4756 | } | |
2bd7c093 PA |
4757 | |
4758 | /* No resume action for this thread. */ | |
4759 | lwp->resume = NULL; | |
64386c31 | 4760 | |
2bd7c093 | 4761 | return 0; |
5544ad89 DJ |
4762 | } |
4763 | ||
20ad9378 DE |
4764 | /* find_inferior callback for linux_resume. |
4765 | Set *FLAG_P if this lwp has an interesting status pending. */ | |
5544ad89 | 4766 | |
bd99dc85 PA |
4767 | static int |
4768 | resume_status_pending_p (struct inferior_list_entry *entry, void *flag_p) | |
5544ad89 | 4769 | { |
d86d4aaf DE |
4770 | struct thread_info *thread = (struct thread_info *) entry; |
4771 | struct lwp_info *lwp = get_thread_lwp (thread); | |
5544ad89 | 4772 | |
bd99dc85 PA |
4773 | /* LWPs which will not be resumed are not interesting, because |
4774 | we might not wait for them next time through linux_wait. */ | |
2bd7c093 | 4775 | if (lwp->resume == NULL) |
bd99dc85 | 4776 | return 0; |
64386c31 | 4777 | |
582511be | 4778 | if (thread_still_has_status_pending_p (thread)) |
d50171e4 PA |
4779 | * (int *) flag_p = 1; |
4780 | ||
4781 | return 0; | |
4782 | } | |
4783 | ||
4784 | /* Return 1 if this lwp that GDB wants running is stopped at an | |
4785 | internal breakpoint that we need to step over. It assumes that any | |
4786 | required STOP_PC adjustment has already been propagated to the | |
4787 | inferior's regcache. */ | |
4788 | ||
4789 | static int | |
4790 | need_step_over_p (struct inferior_list_entry *entry, void *dummy) | |
4791 | { | |
d86d4aaf DE |
4792 | struct thread_info *thread = (struct thread_info *) entry; |
4793 | struct lwp_info *lwp = get_thread_lwp (thread); | |
0bfdf32f | 4794 | struct thread_info *saved_thread; |
d50171e4 | 4795 | CORE_ADDR pc; |
c06cbd92 YQ |
4796 | struct process_info *proc = get_thread_process (thread); |
4797 | ||
4798 | /* GDBserver is skipping the extra traps from the wrapper program, | |
4799 | don't have to do step over. */ | |
4800 | if (proc->tdesc == NULL) | |
4801 | return 0; | |
d50171e4 PA |
4802 | |
4803 | /* LWPs which will not be resumed are not interesting, because we | |
4804 | might not wait for them next time through linux_wait. */ | |
4805 | ||
4806 | if (!lwp->stopped) | |
4807 | { | |
4808 | if (debug_threads) | |
87ce2a04 | 4809 | debug_printf ("Need step over [LWP %ld]? Ignoring, not stopped\n", |
d86d4aaf | 4810 | lwpid_of (thread)); |
d50171e4 PA |
4811 | return 0; |
4812 | } | |
4813 | ||
8336d594 | 4814 | if (thread->last_resume_kind == resume_stop) |
d50171e4 PA |
4815 | { |
4816 | if (debug_threads) | |
87ce2a04 DE |
4817 | debug_printf ("Need step over [LWP %ld]? Ignoring, should remain" |
4818 | " stopped\n", | |
d86d4aaf | 4819 | lwpid_of (thread)); |
d50171e4 PA |
4820 | return 0; |
4821 | } | |
4822 | ||
7984d532 PA |
4823 | gdb_assert (lwp->suspended >= 0); |
4824 | ||
4825 | if (lwp->suspended) | |
4826 | { | |
4827 | if (debug_threads) | |
87ce2a04 | 4828 | debug_printf ("Need step over [LWP %ld]? Ignoring, suspended\n", |
d86d4aaf | 4829 | lwpid_of (thread)); |
7984d532 PA |
4830 | return 0; |
4831 | } | |
4832 | ||
bd99dc85 | 4833 | if (lwp->status_pending_p) |
d50171e4 PA |
4834 | { |
4835 | if (debug_threads) | |
87ce2a04 DE |
4836 | debug_printf ("Need step over [LWP %ld]? Ignoring, has pending" |
4837 | " status.\n", | |
d86d4aaf | 4838 | lwpid_of (thread)); |
d50171e4 PA |
4839 | return 0; |
4840 | } | |
4841 | ||
4842 | /* Note: PC, not STOP_PC. Either GDB has adjusted the PC already, | |
4843 | or we have. */ | |
4844 | pc = get_pc (lwp); | |
4845 | ||
4846 | /* If the PC has changed since we stopped, then don't do anything, | |
4847 | and let the breakpoint/tracepoint be hit. This happens if, for | |
4848 | instance, GDB handled the decr_pc_after_break subtraction itself, | |
4849 | GDB is OOL stepping this thread, or the user has issued a "jump" | |
4850 | command, or poked thread's registers herself. */ | |
4851 | if (pc != lwp->stop_pc) | |
4852 | { | |
4853 | if (debug_threads) | |
87ce2a04 DE |
4854 | debug_printf ("Need step over [LWP %ld]? Cancelling, PC was changed. " |
4855 | "Old stop_pc was 0x%s, PC is now 0x%s\n", | |
d86d4aaf DE |
4856 | lwpid_of (thread), |
4857 | paddress (lwp->stop_pc), paddress (pc)); | |
d50171e4 PA |
4858 | return 0; |
4859 | } | |
4860 | ||
484b3c32 YQ |
4861 | /* On software single step target, resume the inferior with signal |
4862 | rather than stepping over. */ | |
4863 | if (can_software_single_step () | |
4864 | && lwp->pending_signals != NULL | |
4865 | && lwp_signal_can_be_delivered (lwp)) | |
4866 | { | |
4867 | if (debug_threads) | |
4868 | debug_printf ("Need step over [LWP %ld]? Ignoring, has pending" | |
4869 | " signals.\n", | |
4870 | lwpid_of (thread)); | |
4871 | ||
4872 | return 0; | |
4873 | } | |
4874 | ||
0bfdf32f GB |
4875 | saved_thread = current_thread; |
4876 | current_thread = thread; | |
d50171e4 | 4877 | |
8b07ae33 | 4878 | /* We can only step over breakpoints we know about. */ |
fa593d66 | 4879 | if (breakpoint_here (pc) || fast_tracepoint_jump_here (pc)) |
d50171e4 | 4880 | { |
8b07ae33 | 4881 | /* Don't step over a breakpoint that GDB expects to hit |
9f3a5c85 LM |
4882 | though. If the condition is being evaluated on the target's side |
4883 | and it evaluate to false, step over this breakpoint as well. */ | |
4884 | if (gdb_breakpoint_here (pc) | |
d3ce09f5 SS |
4885 | && gdb_condition_true_at_breakpoint (pc) |
4886 | && gdb_no_commands_at_breakpoint (pc)) | |
8b07ae33 PA |
4887 | { |
4888 | if (debug_threads) | |
87ce2a04 DE |
4889 | debug_printf ("Need step over [LWP %ld]? yes, but found" |
4890 | " GDB breakpoint at 0x%s; skipping step over\n", | |
d86d4aaf | 4891 | lwpid_of (thread), paddress (pc)); |
d50171e4 | 4892 | |
0bfdf32f | 4893 | current_thread = saved_thread; |
8b07ae33 PA |
4894 | return 0; |
4895 | } | |
4896 | else | |
4897 | { | |
4898 | if (debug_threads) | |
87ce2a04 DE |
4899 | debug_printf ("Need step over [LWP %ld]? yes, " |
4900 | "found breakpoint at 0x%s\n", | |
d86d4aaf | 4901 | lwpid_of (thread), paddress (pc)); |
d50171e4 | 4902 | |
8b07ae33 PA |
4903 | /* We've found an lwp that needs stepping over --- return 1 so |
4904 | that find_inferior stops looking. */ | |
0bfdf32f | 4905 | current_thread = saved_thread; |
8b07ae33 | 4906 | |
8b07ae33 PA |
4907 | return 1; |
4908 | } | |
d50171e4 PA |
4909 | } |
4910 | ||
0bfdf32f | 4911 | current_thread = saved_thread; |
d50171e4 PA |
4912 | |
4913 | if (debug_threads) | |
87ce2a04 DE |
4914 | debug_printf ("Need step over [LWP %ld]? No, no breakpoint found" |
4915 | " at 0x%s\n", | |
d86d4aaf | 4916 | lwpid_of (thread), paddress (pc)); |
c6ecbae5 | 4917 | |
bd99dc85 | 4918 | return 0; |
5544ad89 DJ |
4919 | } |
4920 | ||
d50171e4 PA |
4921 | /* Start a step-over operation on LWP. When LWP stopped at a |
4922 | breakpoint, to make progress, we need to remove the breakpoint out | |
4923 | of the way. If we let other threads run while we do that, they may | |
4924 | pass by the breakpoint location and miss hitting it. To avoid | |
4925 | that, a step-over momentarily stops all threads while LWP is | |
c40c8d4b YQ |
4926 | single-stepped by either hardware or software while the breakpoint |
4927 | is temporarily uninserted from the inferior. When the single-step | |
4928 | finishes, we reinsert the breakpoint, and let all threads that are | |
4929 | supposed to be running, run again. */ | |
d50171e4 PA |
4930 | |
4931 | static int | |
4932 | start_step_over (struct lwp_info *lwp) | |
4933 | { | |
d86d4aaf | 4934 | struct thread_info *thread = get_lwp_thread (lwp); |
0bfdf32f | 4935 | struct thread_info *saved_thread; |
d50171e4 PA |
4936 | CORE_ADDR pc; |
4937 | int step; | |
4938 | ||
4939 | if (debug_threads) | |
87ce2a04 | 4940 | debug_printf ("Starting step-over on LWP %ld. Stopping all threads\n", |
d86d4aaf | 4941 | lwpid_of (thread)); |
d50171e4 | 4942 | |
7984d532 | 4943 | stop_all_lwps (1, lwp); |
863d01bd PA |
4944 | |
4945 | if (lwp->suspended != 0) | |
4946 | { | |
4947 | internal_error (__FILE__, __LINE__, | |
4948 | "LWP %ld suspended=%d\n", lwpid_of (thread), | |
4949 | lwp->suspended); | |
4950 | } | |
d50171e4 PA |
4951 | |
4952 | if (debug_threads) | |
87ce2a04 | 4953 | debug_printf ("Done stopping all threads for step-over.\n"); |
d50171e4 PA |
4954 | |
4955 | /* Note, we should always reach here with an already adjusted PC, | |
4956 | either by GDB (if we're resuming due to GDB's request), or by our | |
4957 | caller, if we just finished handling an internal breakpoint GDB | |
4958 | shouldn't care about. */ | |
4959 | pc = get_pc (lwp); | |
4960 | ||
0bfdf32f GB |
4961 | saved_thread = current_thread; |
4962 | current_thread = thread; | |
d50171e4 PA |
4963 | |
4964 | lwp->bp_reinsert = pc; | |
4965 | uninsert_breakpoints_at (pc); | |
fa593d66 | 4966 | uninsert_fast_tracepoint_jumps_at (pc); |
d50171e4 | 4967 | |
7fe5e27e | 4968 | step = single_step (lwp); |
d50171e4 | 4969 | |
0bfdf32f | 4970 | current_thread = saved_thread; |
d50171e4 PA |
4971 | |
4972 | linux_resume_one_lwp (lwp, step, 0, NULL); | |
4973 | ||
4974 | /* Require next event from this LWP. */ | |
d86d4aaf | 4975 | step_over_bkpt = thread->entry.id; |
d50171e4 PA |
4976 | return 1; |
4977 | } | |
4978 | ||
4979 | /* Finish a step-over. Reinsert the breakpoint we had uninserted in | |
3b9a79ef | 4980 | start_step_over, if still there, and delete any single-step |
d50171e4 PA |
4981 | breakpoints we've set, on non hardware single-step targets. */ |
4982 | ||
4983 | static int | |
4984 | finish_step_over (struct lwp_info *lwp) | |
4985 | { | |
4986 | if (lwp->bp_reinsert != 0) | |
4987 | { | |
f79b145d YQ |
4988 | struct thread_info *saved_thread = current_thread; |
4989 | ||
d50171e4 | 4990 | if (debug_threads) |
87ce2a04 | 4991 | debug_printf ("Finished step over.\n"); |
d50171e4 | 4992 | |
f79b145d YQ |
4993 | current_thread = get_lwp_thread (lwp); |
4994 | ||
d50171e4 PA |
4995 | /* Reinsert any breakpoint at LWP->BP_REINSERT. Note that there |
4996 | may be no breakpoint to reinsert there by now. */ | |
4997 | reinsert_breakpoints_at (lwp->bp_reinsert); | |
fa593d66 | 4998 | reinsert_fast_tracepoint_jumps_at (lwp->bp_reinsert); |
d50171e4 PA |
4999 | |
5000 | lwp->bp_reinsert = 0; | |
5001 | ||
3b9a79ef YQ |
5002 | /* Delete any single-step breakpoints. No longer needed. We |
5003 | don't have to worry about other threads hitting this trap, | |
5004 | and later not being able to explain it, because we were | |
5005 | stepping over a breakpoint, and we hold all threads but | |
5006 | LWP stopped while doing that. */ | |
d50171e4 | 5007 | if (!can_hardware_single_step ()) |
f79b145d | 5008 | { |
3b9a79ef YQ |
5009 | gdb_assert (has_single_step_breakpoints (current_thread)); |
5010 | delete_single_step_breakpoints (current_thread); | |
f79b145d | 5011 | } |
d50171e4 PA |
5012 | |
5013 | step_over_bkpt = null_ptid; | |
f79b145d | 5014 | current_thread = saved_thread; |
d50171e4 PA |
5015 | return 1; |
5016 | } | |
5017 | else | |
5018 | return 0; | |
5019 | } | |
5020 | ||
863d01bd PA |
5021 | /* If there's a step over in progress, wait until all threads stop |
5022 | (that is, until the stepping thread finishes its step), and | |
5023 | unsuspend all lwps. The stepping thread ends with its status | |
5024 | pending, which is processed later when we get back to processing | |
5025 | events. */ | |
5026 | ||
5027 | static void | |
5028 | complete_ongoing_step_over (void) | |
5029 | { | |
5030 | if (!ptid_equal (step_over_bkpt, null_ptid)) | |
5031 | { | |
5032 | struct lwp_info *lwp; | |
5033 | int wstat; | |
5034 | int ret; | |
5035 | ||
5036 | if (debug_threads) | |
5037 | debug_printf ("detach: step over in progress, finish it first\n"); | |
5038 | ||
5039 | /* Passing NULL_PTID as filter indicates we want all events to | |
5040 | be left pending. Eventually this returns when there are no | |
5041 | unwaited-for children left. */ | |
5042 | ret = linux_wait_for_event_filtered (minus_one_ptid, null_ptid, | |
5043 | &wstat, __WALL); | |
5044 | gdb_assert (ret == -1); | |
5045 | ||
5046 | lwp = find_lwp_pid (step_over_bkpt); | |
5047 | if (lwp != NULL) | |
5048 | finish_step_over (lwp); | |
5049 | step_over_bkpt = null_ptid; | |
5050 | unsuspend_all_lwps (lwp); | |
5051 | } | |
5052 | } | |
5053 | ||
5544ad89 DJ |
5054 | /* This function is called once per thread. We check the thread's resume |
5055 | request, which will tell us whether to resume, step, or leave the thread | |
bd99dc85 | 5056 | stopped; and what signal, if any, it should be sent. |
5544ad89 | 5057 | |
bd99dc85 PA |
5058 | For threads which we aren't explicitly told otherwise, we preserve |
5059 | the stepping flag; this is used for stepping over gdbserver-placed | |
5060 | breakpoints. | |
5061 | ||
5062 | If pending_flags was set in any thread, we queue any needed | |
5063 | signals, since we won't actually resume. We already have a pending | |
5064 | event to report, so we don't need to preserve any step requests; | |
5065 | they should be re-issued if necessary. */ | |
5066 | ||
5067 | static int | |
5068 | linux_resume_one_thread (struct inferior_list_entry *entry, void *arg) | |
5544ad89 | 5069 | { |
d86d4aaf DE |
5070 | struct thread_info *thread = (struct thread_info *) entry; |
5071 | struct lwp_info *lwp = get_thread_lwp (thread); | |
d50171e4 PA |
5072 | int leave_all_stopped = * (int *) arg; |
5073 | int leave_pending; | |
5544ad89 | 5074 | |
2bd7c093 | 5075 | if (lwp->resume == NULL) |
bd99dc85 | 5076 | return 0; |
5544ad89 | 5077 | |
bd99dc85 | 5078 | if (lwp->resume->kind == resume_stop) |
5544ad89 | 5079 | { |
bd99dc85 | 5080 | if (debug_threads) |
d86d4aaf | 5081 | debug_printf ("resume_stop request for LWP %ld\n", lwpid_of (thread)); |
bd99dc85 PA |
5082 | |
5083 | if (!lwp->stopped) | |
5084 | { | |
5085 | if (debug_threads) | |
d86d4aaf | 5086 | debug_printf ("stopping LWP %ld\n", lwpid_of (thread)); |
bd99dc85 | 5087 | |
d50171e4 PA |
5088 | /* Stop the thread, and wait for the event asynchronously, |
5089 | through the event loop. */ | |
02fc4de7 | 5090 | send_sigstop (lwp); |
bd99dc85 PA |
5091 | } |
5092 | else | |
5093 | { | |
5094 | if (debug_threads) | |
87ce2a04 | 5095 | debug_printf ("already stopped LWP %ld\n", |
d86d4aaf | 5096 | lwpid_of (thread)); |
d50171e4 PA |
5097 | |
5098 | /* The LWP may have been stopped in an internal event that | |
5099 | was not meant to be notified back to GDB (e.g., gdbserver | |
5100 | breakpoint), so we should be reporting a stop event in | |
5101 | this case too. */ | |
5102 | ||
5103 | /* If the thread already has a pending SIGSTOP, this is a | |
5104 | no-op. Otherwise, something later will presumably resume | |
5105 | the thread and this will cause it to cancel any pending | |
5106 | operation, due to last_resume_kind == resume_stop. If | |
5107 | the thread already has a pending status to report, we | |
5108 | will still report it the next time we wait - see | |
5109 | status_pending_p_callback. */ | |
1a981360 PA |
5110 | |
5111 | /* If we already have a pending signal to report, then | |
5112 | there's no need to queue a SIGSTOP, as this means we're | |
5113 | midway through moving the LWP out of the jumppad, and we | |
5114 | will report the pending signal as soon as that is | |
5115 | finished. */ | |
5116 | if (lwp->pending_signals_to_report == NULL) | |
5117 | send_sigstop (lwp); | |
bd99dc85 | 5118 | } |
32ca6d61 | 5119 | |
bd99dc85 PA |
5120 | /* For stop requests, we're done. */ |
5121 | lwp->resume = NULL; | |
fc7238bb | 5122 | thread->last_status.kind = TARGET_WAITKIND_IGNORE; |
bd99dc85 | 5123 | return 0; |
5544ad89 DJ |
5124 | } |
5125 | ||
bd99dc85 | 5126 | /* If this thread which is about to be resumed has a pending status, |
863d01bd PA |
5127 | then don't resume it - we can just report the pending status. |
5128 | Likewise if it is suspended, because e.g., another thread is | |
5129 | stepping past a breakpoint. Make sure to queue any signals that | |
5130 | would otherwise be sent. In all-stop mode, we do this decision | |
5131 | based on if *any* thread has a pending status. If there's a | |
5132 | thread that needs the step-over-breakpoint dance, then don't | |
5133 | resume any other thread but that particular one. */ | |
5134 | leave_pending = (lwp->suspended | |
5135 | || lwp->status_pending_p | |
5136 | || leave_all_stopped); | |
5544ad89 | 5137 | |
0e9a339e YQ |
5138 | /* If we have a new signal, enqueue the signal. */ |
5139 | if (lwp->resume->sig != 0) | |
5140 | { | |
5141 | siginfo_t info, *info_p; | |
5142 | ||
5143 | /* If this is the same signal we were previously stopped by, | |
5144 | make sure to queue its siginfo. */ | |
5145 | if (WIFSTOPPED (lwp->last_status) | |
5146 | && WSTOPSIG (lwp->last_status) == lwp->resume->sig | |
5147 | && ptrace (PTRACE_GETSIGINFO, lwpid_of (thread), | |
5148 | (PTRACE_TYPE_ARG3) 0, &info) == 0) | |
5149 | info_p = &info; | |
5150 | else | |
5151 | info_p = NULL; | |
5152 | ||
5153 | enqueue_pending_signal (lwp, lwp->resume->sig, info_p); | |
5154 | } | |
5155 | ||
d50171e4 | 5156 | if (!leave_pending) |
bd99dc85 PA |
5157 | { |
5158 | if (debug_threads) | |
d86d4aaf | 5159 | debug_printf ("resuming LWP %ld\n", lwpid_of (thread)); |
5544ad89 | 5160 | |
0e9a339e | 5161 | proceed_one_lwp (entry, NULL); |
bd99dc85 PA |
5162 | } |
5163 | else | |
5164 | { | |
5165 | if (debug_threads) | |
d86d4aaf | 5166 | debug_printf ("leaving LWP %ld stopped\n", lwpid_of (thread)); |
bd99dc85 | 5167 | } |
5544ad89 | 5168 | |
fc7238bb | 5169 | thread->last_status.kind = TARGET_WAITKIND_IGNORE; |
bd99dc85 | 5170 | lwp->resume = NULL; |
5544ad89 | 5171 | return 0; |
0d62e5e8 DJ |
5172 | } |
5173 | ||
5174 | static void | |
2bd7c093 | 5175 | linux_resume (struct thread_resume *resume_info, size_t n) |
0d62e5e8 | 5176 | { |
2bd7c093 | 5177 | struct thread_resume_array array = { resume_info, n }; |
d86d4aaf | 5178 | struct thread_info *need_step_over = NULL; |
d50171e4 PA |
5179 | int any_pending; |
5180 | int leave_all_stopped; | |
c6ecbae5 | 5181 | |
87ce2a04 DE |
5182 | if (debug_threads) |
5183 | { | |
5184 | debug_enter (); | |
5185 | debug_printf ("linux_resume:\n"); | |
5186 | } | |
5187 | ||
2bd7c093 | 5188 | find_inferior (&all_threads, linux_set_resume_request, &array); |
5544ad89 | 5189 | |
d50171e4 PA |
5190 | /* If there is a thread which would otherwise be resumed, which has |
5191 | a pending status, then don't resume any threads - we can just | |
5192 | report the pending status. Make sure to queue any signals that | |
5193 | would otherwise be sent. In non-stop mode, we'll apply this | |
5194 | logic to each thread individually. We consume all pending events | |
5195 | before considering to start a step-over (in all-stop). */ | |
5196 | any_pending = 0; | |
bd99dc85 | 5197 | if (!non_stop) |
d86d4aaf | 5198 | find_inferior (&all_threads, resume_status_pending_p, &any_pending); |
d50171e4 PA |
5199 | |
5200 | /* If there is a thread which would otherwise be resumed, which is | |
5201 | stopped at a breakpoint that needs stepping over, then don't | |
5202 | resume any threads - have it step over the breakpoint with all | |
5203 | other threads stopped, then resume all threads again. Make sure | |
5204 | to queue any signals that would otherwise be delivered or | |
5205 | queued. */ | |
5206 | if (!any_pending && supports_breakpoints ()) | |
5207 | need_step_over | |
d86d4aaf DE |
5208 | = (struct thread_info *) find_inferior (&all_threads, |
5209 | need_step_over_p, NULL); | |
d50171e4 PA |
5210 | |
5211 | leave_all_stopped = (need_step_over != NULL || any_pending); | |
5212 | ||
5213 | if (debug_threads) | |
5214 | { | |
5215 | if (need_step_over != NULL) | |
87ce2a04 | 5216 | debug_printf ("Not resuming all, need step over\n"); |
d50171e4 | 5217 | else if (any_pending) |
87ce2a04 DE |
5218 | debug_printf ("Not resuming, all-stop and found " |
5219 | "an LWP with pending status\n"); | |
d50171e4 | 5220 | else |
87ce2a04 | 5221 | debug_printf ("Resuming, no pending status or step over needed\n"); |
d50171e4 PA |
5222 | } |
5223 | ||
5224 | /* Even if we're leaving threads stopped, queue all signals we'd | |
5225 | otherwise deliver. */ | |
5226 | find_inferior (&all_threads, linux_resume_one_thread, &leave_all_stopped); | |
5227 | ||
5228 | if (need_step_over) | |
d86d4aaf | 5229 | start_step_over (get_thread_lwp (need_step_over)); |
87ce2a04 DE |
5230 | |
5231 | if (debug_threads) | |
5232 | { | |
5233 | debug_printf ("linux_resume done\n"); | |
5234 | debug_exit (); | |
5235 | } | |
1bebeeca PA |
5236 | |
5237 | /* We may have events that were pending that can/should be sent to | |
5238 | the client now. Trigger a linux_wait call. */ | |
5239 | if (target_is_async_p ()) | |
5240 | async_file_mark (); | |
d50171e4 PA |
5241 | } |
5242 | ||
5243 | /* This function is called once per thread. We check the thread's | |
5244 | last resume request, which will tell us whether to resume, step, or | |
5245 | leave the thread stopped. Any signal the client requested to be | |
5246 | delivered has already been enqueued at this point. | |
5247 | ||
5248 | If any thread that GDB wants running is stopped at an internal | |
5249 | breakpoint that needs stepping over, we start a step-over operation | |
5250 | on that particular thread, and leave all others stopped. */ | |
5251 | ||
7984d532 PA |
5252 | static int |
5253 | proceed_one_lwp (struct inferior_list_entry *entry, void *except) | |
d50171e4 | 5254 | { |
d86d4aaf DE |
5255 | struct thread_info *thread = (struct thread_info *) entry; |
5256 | struct lwp_info *lwp = get_thread_lwp (thread); | |
d50171e4 PA |
5257 | int step; |
5258 | ||
7984d532 PA |
5259 | if (lwp == except) |
5260 | return 0; | |
d50171e4 PA |
5261 | |
5262 | if (debug_threads) | |
d86d4aaf | 5263 | debug_printf ("proceed_one_lwp: lwp %ld\n", lwpid_of (thread)); |
d50171e4 PA |
5264 | |
5265 | if (!lwp->stopped) | |
5266 | { | |
5267 | if (debug_threads) | |
d86d4aaf | 5268 | debug_printf (" LWP %ld already running\n", lwpid_of (thread)); |
7984d532 | 5269 | return 0; |
d50171e4 PA |
5270 | } |
5271 | ||
02fc4de7 PA |
5272 | if (thread->last_resume_kind == resume_stop |
5273 | && thread->last_status.kind != TARGET_WAITKIND_IGNORE) | |
d50171e4 PA |
5274 | { |
5275 | if (debug_threads) | |
87ce2a04 | 5276 | debug_printf (" client wants LWP to remain %ld stopped\n", |
d86d4aaf | 5277 | lwpid_of (thread)); |
7984d532 | 5278 | return 0; |
d50171e4 PA |
5279 | } |
5280 | ||
5281 | if (lwp->status_pending_p) | |
5282 | { | |
5283 | if (debug_threads) | |
87ce2a04 | 5284 | debug_printf (" LWP %ld has pending status, leaving stopped\n", |
d86d4aaf | 5285 | lwpid_of (thread)); |
7984d532 | 5286 | return 0; |
d50171e4 PA |
5287 | } |
5288 | ||
7984d532 PA |
5289 | gdb_assert (lwp->suspended >= 0); |
5290 | ||
d50171e4 PA |
5291 | if (lwp->suspended) |
5292 | { | |
5293 | if (debug_threads) | |
d86d4aaf | 5294 | debug_printf (" LWP %ld is suspended\n", lwpid_of (thread)); |
7984d532 | 5295 | return 0; |
d50171e4 PA |
5296 | } |
5297 | ||
1a981360 PA |
5298 | if (thread->last_resume_kind == resume_stop |
5299 | && lwp->pending_signals_to_report == NULL | |
5300 | && lwp->collecting_fast_tracepoint == 0) | |
02fc4de7 PA |
5301 | { |
5302 | /* We haven't reported this LWP as stopped yet (otherwise, the | |
5303 | last_status.kind check above would catch it, and we wouldn't | |
5304 | reach here. This LWP may have been momentarily paused by a | |
5305 | stop_all_lwps call while handling for example, another LWP's | |
5306 | step-over. In that case, the pending expected SIGSTOP signal | |
5307 | that was queued at vCont;t handling time will have already | |
5308 | been consumed by wait_for_sigstop, and so we need to requeue | |
5309 | another one here. Note that if the LWP already has a SIGSTOP | |
5310 | pending, this is a no-op. */ | |
5311 | ||
5312 | if (debug_threads) | |
87ce2a04 DE |
5313 | debug_printf ("Client wants LWP %ld to stop. " |
5314 | "Making sure it has a SIGSTOP pending\n", | |
d86d4aaf | 5315 | lwpid_of (thread)); |
02fc4de7 PA |
5316 | |
5317 | send_sigstop (lwp); | |
5318 | } | |
5319 | ||
863d01bd PA |
5320 | if (thread->last_resume_kind == resume_step) |
5321 | { | |
5322 | if (debug_threads) | |
5323 | debug_printf (" stepping LWP %ld, client wants it stepping\n", | |
5324 | lwpid_of (thread)); | |
8901d193 | 5325 | |
3b9a79ef | 5326 | /* If resume_step is requested by GDB, install single-step |
8901d193 | 5327 | breakpoints when the thread is about to be actually resumed if |
3b9a79ef YQ |
5328 | the single-step breakpoints weren't removed. */ |
5329 | if (can_software_single_step () | |
5330 | && !has_single_step_breakpoints (thread)) | |
8901d193 YQ |
5331 | install_software_single_step_breakpoints (lwp); |
5332 | ||
5333 | step = maybe_hw_step (thread); | |
863d01bd PA |
5334 | } |
5335 | else if (lwp->bp_reinsert != 0) | |
5336 | { | |
5337 | if (debug_threads) | |
5338 | debug_printf (" stepping LWP %ld, reinsert set\n", | |
5339 | lwpid_of (thread)); | |
f79b145d YQ |
5340 | |
5341 | step = maybe_hw_step (thread); | |
863d01bd PA |
5342 | } |
5343 | else | |
5344 | step = 0; | |
5345 | ||
d50171e4 | 5346 | linux_resume_one_lwp (lwp, step, 0, NULL); |
7984d532 PA |
5347 | return 0; |
5348 | } | |
5349 | ||
5350 | static int | |
5351 | unsuspend_and_proceed_one_lwp (struct inferior_list_entry *entry, void *except) | |
5352 | { | |
d86d4aaf DE |
5353 | struct thread_info *thread = (struct thread_info *) entry; |
5354 | struct lwp_info *lwp = get_thread_lwp (thread); | |
7984d532 PA |
5355 | |
5356 | if (lwp == except) | |
5357 | return 0; | |
5358 | ||
863d01bd | 5359 | lwp_suspended_decr (lwp); |
7984d532 PA |
5360 | |
5361 | return proceed_one_lwp (entry, except); | |
d50171e4 PA |
5362 | } |
5363 | ||
5364 | /* When we finish a step-over, set threads running again. If there's | |
5365 | another thread that may need a step-over, now's the time to start | |
5366 | it. Eventually, we'll move all threads past their breakpoints. */ | |
5367 | ||
5368 | static void | |
5369 | proceed_all_lwps (void) | |
5370 | { | |
d86d4aaf | 5371 | struct thread_info *need_step_over; |
d50171e4 PA |
5372 | |
5373 | /* If there is a thread which would otherwise be resumed, which is | |
5374 | stopped at a breakpoint that needs stepping over, then don't | |
5375 | resume any threads - have it step over the breakpoint with all | |
5376 | other threads stopped, then resume all threads again. */ | |
5377 | ||
5378 | if (supports_breakpoints ()) | |
5379 | { | |
5380 | need_step_over | |
d86d4aaf DE |
5381 | = (struct thread_info *) find_inferior (&all_threads, |
5382 | need_step_over_p, NULL); | |
d50171e4 PA |
5383 | |
5384 | if (need_step_over != NULL) | |
5385 | { | |
5386 | if (debug_threads) | |
87ce2a04 DE |
5387 | debug_printf ("proceed_all_lwps: found " |
5388 | "thread %ld needing a step-over\n", | |
5389 | lwpid_of (need_step_over)); | |
d50171e4 | 5390 | |
d86d4aaf | 5391 | start_step_over (get_thread_lwp (need_step_over)); |
d50171e4 PA |
5392 | return; |
5393 | } | |
5394 | } | |
5544ad89 | 5395 | |
d50171e4 | 5396 | if (debug_threads) |
87ce2a04 | 5397 | debug_printf ("Proceeding, no step-over needed\n"); |
d50171e4 | 5398 | |
d86d4aaf | 5399 | find_inferior (&all_threads, proceed_one_lwp, NULL); |
d50171e4 PA |
5400 | } |
5401 | ||
5402 | /* Stopped LWPs that the client wanted to be running, that don't have | |
5403 | pending statuses, are set to run again, except for EXCEPT, if not | |
5404 | NULL. This undoes a stop_all_lwps call. */ | |
5405 | ||
5406 | static void | |
7984d532 | 5407 | unstop_all_lwps (int unsuspend, struct lwp_info *except) |
d50171e4 | 5408 | { |
5544ad89 DJ |
5409 | if (debug_threads) |
5410 | { | |
87ce2a04 | 5411 | debug_enter (); |
d50171e4 | 5412 | if (except) |
87ce2a04 | 5413 | debug_printf ("unstopping all lwps, except=(LWP %ld)\n", |
d86d4aaf | 5414 | lwpid_of (get_lwp_thread (except))); |
5544ad89 | 5415 | else |
87ce2a04 | 5416 | debug_printf ("unstopping all lwps\n"); |
5544ad89 DJ |
5417 | } |
5418 | ||
7984d532 | 5419 | if (unsuspend) |
d86d4aaf | 5420 | find_inferior (&all_threads, unsuspend_and_proceed_one_lwp, except); |
7984d532 | 5421 | else |
d86d4aaf | 5422 | find_inferior (&all_threads, proceed_one_lwp, except); |
87ce2a04 DE |
5423 | |
5424 | if (debug_threads) | |
5425 | { | |
5426 | debug_printf ("unstop_all_lwps done\n"); | |
5427 | debug_exit (); | |
5428 | } | |
0d62e5e8 DJ |
5429 | } |
5430 | ||
58caa3dc DJ |
5431 | |
5432 | #ifdef HAVE_LINUX_REGSETS | |
5433 | ||
1faeff08 MR |
5434 | #define use_linux_regsets 1 |
5435 | ||
030031ee PA |
5436 | /* Returns true if REGSET has been disabled. */ |
5437 | ||
5438 | static int | |
5439 | regset_disabled (struct regsets_info *info, struct regset_info *regset) | |
5440 | { | |
5441 | return (info->disabled_regsets != NULL | |
5442 | && info->disabled_regsets[regset - info->regsets]); | |
5443 | } | |
5444 | ||
5445 | /* Disable REGSET. */ | |
5446 | ||
5447 | static void | |
5448 | disable_regset (struct regsets_info *info, struct regset_info *regset) | |
5449 | { | |
5450 | int dr_offset; | |
5451 | ||
5452 | dr_offset = regset - info->regsets; | |
5453 | if (info->disabled_regsets == NULL) | |
224c3ddb | 5454 | info->disabled_regsets = (char *) xcalloc (1, info->num_regsets); |
030031ee PA |
5455 | info->disabled_regsets[dr_offset] = 1; |
5456 | } | |
5457 | ||
58caa3dc | 5458 | static int |
3aee8918 PA |
5459 | regsets_fetch_inferior_registers (struct regsets_info *regsets_info, |
5460 | struct regcache *regcache) | |
58caa3dc DJ |
5461 | { |
5462 | struct regset_info *regset; | |
e9d25b98 | 5463 | int saw_general_regs = 0; |
95954743 | 5464 | int pid; |
1570b33e | 5465 | struct iovec iov; |
58caa3dc | 5466 | |
0bfdf32f | 5467 | pid = lwpid_of (current_thread); |
28eef672 | 5468 | for (regset = regsets_info->regsets; regset->size >= 0; regset++) |
58caa3dc | 5469 | { |
1570b33e L |
5470 | void *buf, *data; |
5471 | int nt_type, res; | |
58caa3dc | 5472 | |
030031ee | 5473 | if (regset->size == 0 || regset_disabled (regsets_info, regset)) |
28eef672 | 5474 | continue; |
58caa3dc | 5475 | |
bca929d3 | 5476 | buf = xmalloc (regset->size); |
1570b33e L |
5477 | |
5478 | nt_type = regset->nt_type; | |
5479 | if (nt_type) | |
5480 | { | |
5481 | iov.iov_base = buf; | |
5482 | iov.iov_len = regset->size; | |
5483 | data = (void *) &iov; | |
5484 | } | |
5485 | else | |
5486 | data = buf; | |
5487 | ||
dfb64f85 | 5488 | #ifndef __sparc__ |
f15f9948 | 5489 | res = ptrace (regset->get_request, pid, |
b8e1b30e | 5490 | (PTRACE_TYPE_ARG3) (long) nt_type, data); |
dfb64f85 | 5491 | #else |
1570b33e | 5492 | res = ptrace (regset->get_request, pid, data, nt_type); |
dfb64f85 | 5493 | #endif |
58caa3dc DJ |
5494 | if (res < 0) |
5495 | { | |
5496 | if (errno == EIO) | |
5497 | { | |
52fa2412 | 5498 | /* If we get EIO on a regset, do not try it again for |
3aee8918 | 5499 | this process mode. */ |
030031ee | 5500 | disable_regset (regsets_info, regset); |
58caa3dc | 5501 | } |
e5a9158d AA |
5502 | else if (errno == ENODATA) |
5503 | { | |
5504 | /* ENODATA may be returned if the regset is currently | |
5505 | not "active". This can happen in normal operation, | |
5506 | so suppress the warning in this case. */ | |
5507 | } | |
fcd4a73d YQ |
5508 | else if (errno == ESRCH) |
5509 | { | |
5510 | /* At this point, ESRCH should mean the process is | |
5511 | already gone, in which case we simply ignore attempts | |
5512 | to read its registers. */ | |
5513 | } | |
58caa3dc DJ |
5514 | else |
5515 | { | |
0d62e5e8 | 5516 | char s[256]; |
95954743 PA |
5517 | sprintf (s, "ptrace(regsets_fetch_inferior_registers) PID=%d", |
5518 | pid); | |
0d62e5e8 | 5519 | perror (s); |
58caa3dc DJ |
5520 | } |
5521 | } | |
098dbe61 AA |
5522 | else |
5523 | { | |
5524 | if (regset->type == GENERAL_REGS) | |
5525 | saw_general_regs = 1; | |
5526 | regset->store_function (regcache, buf); | |
5527 | } | |
fdeb2a12 | 5528 | free (buf); |
58caa3dc | 5529 | } |
e9d25b98 DJ |
5530 | if (saw_general_regs) |
5531 | return 0; | |
5532 | else | |
5533 | return 1; | |
58caa3dc DJ |
5534 | } |
5535 | ||
5536 | static int | |
3aee8918 PA |
5537 | regsets_store_inferior_registers (struct regsets_info *regsets_info, |
5538 | struct regcache *regcache) | |
58caa3dc DJ |
5539 | { |
5540 | struct regset_info *regset; | |
e9d25b98 | 5541 | int saw_general_regs = 0; |
95954743 | 5542 | int pid; |
1570b33e | 5543 | struct iovec iov; |
58caa3dc | 5544 | |
0bfdf32f | 5545 | pid = lwpid_of (current_thread); |
28eef672 | 5546 | for (regset = regsets_info->regsets; regset->size >= 0; regset++) |
58caa3dc | 5547 | { |
1570b33e L |
5548 | void *buf, *data; |
5549 | int nt_type, res; | |
58caa3dc | 5550 | |
feea5f36 AA |
5551 | if (regset->size == 0 || regset_disabled (regsets_info, regset) |
5552 | || regset->fill_function == NULL) | |
28eef672 | 5553 | continue; |
58caa3dc | 5554 | |
bca929d3 | 5555 | buf = xmalloc (regset->size); |
545587ee DJ |
5556 | |
5557 | /* First fill the buffer with the current register set contents, | |
5558 | in case there are any items in the kernel's regset that are | |
5559 | not in gdbserver's regcache. */ | |
1570b33e L |
5560 | |
5561 | nt_type = regset->nt_type; | |
5562 | if (nt_type) | |
5563 | { | |
5564 | iov.iov_base = buf; | |
5565 | iov.iov_len = regset->size; | |
5566 | data = (void *) &iov; | |
5567 | } | |
5568 | else | |
5569 | data = buf; | |
5570 | ||
dfb64f85 | 5571 | #ifndef __sparc__ |
f15f9948 | 5572 | res = ptrace (regset->get_request, pid, |
b8e1b30e | 5573 | (PTRACE_TYPE_ARG3) (long) nt_type, data); |
dfb64f85 | 5574 | #else |
689cc2ae | 5575 | res = ptrace (regset->get_request, pid, data, nt_type); |
dfb64f85 | 5576 | #endif |
545587ee DJ |
5577 | |
5578 | if (res == 0) | |
5579 | { | |
5580 | /* Then overlay our cached registers on that. */ | |
442ea881 | 5581 | regset->fill_function (regcache, buf); |
545587ee DJ |
5582 | |
5583 | /* Only now do we write the register set. */ | |
dfb64f85 | 5584 | #ifndef __sparc__ |
f15f9948 | 5585 | res = ptrace (regset->set_request, pid, |
b8e1b30e | 5586 | (PTRACE_TYPE_ARG3) (long) nt_type, data); |
dfb64f85 | 5587 | #else |
1570b33e | 5588 | res = ptrace (regset->set_request, pid, data, nt_type); |
dfb64f85 | 5589 | #endif |
545587ee DJ |
5590 | } |
5591 | ||
58caa3dc DJ |
5592 | if (res < 0) |
5593 | { | |
5594 | if (errno == EIO) | |
5595 | { | |
52fa2412 | 5596 | /* If we get EIO on a regset, do not try it again for |
3aee8918 | 5597 | this process mode. */ |
030031ee | 5598 | disable_regset (regsets_info, regset); |
58caa3dc | 5599 | } |
3221518c UW |
5600 | else if (errno == ESRCH) |
5601 | { | |
1b3f6016 PA |
5602 | /* At this point, ESRCH should mean the process is |
5603 | already gone, in which case we simply ignore attempts | |
5604 | to change its registers. See also the related | |
5605 | comment in linux_resume_one_lwp. */ | |
fdeb2a12 | 5606 | free (buf); |
3221518c UW |
5607 | return 0; |
5608 | } | |
58caa3dc DJ |
5609 | else |
5610 | { | |
ce3a066d | 5611 | perror ("Warning: ptrace(regsets_store_inferior_registers)"); |
58caa3dc DJ |
5612 | } |
5613 | } | |
e9d25b98 DJ |
5614 | else if (regset->type == GENERAL_REGS) |
5615 | saw_general_regs = 1; | |
09ec9b38 | 5616 | free (buf); |
58caa3dc | 5617 | } |
e9d25b98 DJ |
5618 | if (saw_general_regs) |
5619 | return 0; | |
5620 | else | |
5621 | return 1; | |
58caa3dc DJ |
5622 | } |
5623 | ||
1faeff08 | 5624 | #else /* !HAVE_LINUX_REGSETS */ |
58caa3dc | 5625 | |
1faeff08 | 5626 | #define use_linux_regsets 0 |
3aee8918 PA |
5627 | #define regsets_fetch_inferior_registers(regsets_info, regcache) 1 |
5628 | #define regsets_store_inferior_registers(regsets_info, regcache) 1 | |
58caa3dc | 5629 | |
58caa3dc | 5630 | #endif |
1faeff08 MR |
5631 | |
5632 | /* Return 1 if register REGNO is supported by one of the regset ptrace | |
5633 | calls or 0 if it has to be transferred individually. */ | |
5634 | ||
5635 | static int | |
3aee8918 | 5636 | linux_register_in_regsets (const struct regs_info *regs_info, int regno) |
1faeff08 MR |
5637 | { |
5638 | unsigned char mask = 1 << (regno % 8); | |
5639 | size_t index = regno / 8; | |
5640 | ||
5641 | return (use_linux_regsets | |
3aee8918 PA |
5642 | && (regs_info->regset_bitmap == NULL |
5643 | || (regs_info->regset_bitmap[index] & mask) != 0)); | |
1faeff08 MR |
5644 | } |
5645 | ||
58caa3dc | 5646 | #ifdef HAVE_LINUX_USRREGS |
1faeff08 | 5647 | |
5b3da067 | 5648 | static int |
3aee8918 | 5649 | register_addr (const struct usrregs_info *usrregs, int regnum) |
1faeff08 MR |
5650 | { |
5651 | int addr; | |
5652 | ||
3aee8918 | 5653 | if (regnum < 0 || regnum >= usrregs->num_regs) |
1faeff08 MR |
5654 | error ("Invalid register number %d.", regnum); |
5655 | ||
3aee8918 | 5656 | addr = usrregs->regmap[regnum]; |
1faeff08 MR |
5657 | |
5658 | return addr; | |
5659 | } | |
5660 | ||
5661 | /* Fetch one register. */ | |
5662 | static void | |
3aee8918 PA |
5663 | fetch_register (const struct usrregs_info *usrregs, |
5664 | struct regcache *regcache, int regno) | |
1faeff08 MR |
5665 | { |
5666 | CORE_ADDR regaddr; | |
5667 | int i, size; | |
5668 | char *buf; | |
5669 | int pid; | |
5670 | ||
3aee8918 | 5671 | if (regno >= usrregs->num_regs) |
1faeff08 MR |
5672 | return; |
5673 | if ((*the_low_target.cannot_fetch_register) (regno)) | |
5674 | return; | |
5675 | ||
3aee8918 | 5676 | regaddr = register_addr (usrregs, regno); |
1faeff08 MR |
5677 | if (regaddr == -1) |
5678 | return; | |
5679 | ||
3aee8918 PA |
5680 | size = ((register_size (regcache->tdesc, regno) |
5681 | + sizeof (PTRACE_XFER_TYPE) - 1) | |
1faeff08 | 5682 | & -sizeof (PTRACE_XFER_TYPE)); |
224c3ddb | 5683 | buf = (char *) alloca (size); |
1faeff08 | 5684 | |
0bfdf32f | 5685 | pid = lwpid_of (current_thread); |
1faeff08 MR |
5686 | for (i = 0; i < size; i += sizeof (PTRACE_XFER_TYPE)) |
5687 | { | |
5688 | errno = 0; | |
5689 | *(PTRACE_XFER_TYPE *) (buf + i) = | |
5690 | ptrace (PTRACE_PEEKUSER, pid, | |
5691 | /* Coerce to a uintptr_t first to avoid potential gcc warning | |
5692 | of coercing an 8 byte integer to a 4 byte pointer. */ | |
b8e1b30e | 5693 | (PTRACE_TYPE_ARG3) (uintptr_t) regaddr, (PTRACE_TYPE_ARG4) 0); |
1faeff08 MR |
5694 | regaddr += sizeof (PTRACE_XFER_TYPE); |
5695 | if (errno != 0) | |
5696 | error ("reading register %d: %s", regno, strerror (errno)); | |
5697 | } | |
5698 | ||
5699 | if (the_low_target.supply_ptrace_register) | |
5700 | the_low_target.supply_ptrace_register (regcache, regno, buf); | |
5701 | else | |
5702 | supply_register (regcache, regno, buf); | |
5703 | } | |
5704 | ||
5705 | /* Store one register. */ | |
5706 | static void | |
3aee8918 PA |
5707 | store_register (const struct usrregs_info *usrregs, |
5708 | struct regcache *regcache, int regno) | |
1faeff08 MR |
5709 | { |
5710 | CORE_ADDR regaddr; | |
5711 | int i, size; | |
5712 | char *buf; | |
5713 | int pid; | |
5714 | ||
3aee8918 | 5715 | if (regno >= usrregs->num_regs) |
1faeff08 MR |
5716 | return; |
5717 | if ((*the_low_target.cannot_store_register) (regno)) | |
5718 | return; | |
5719 | ||
3aee8918 | 5720 | regaddr = register_addr (usrregs, regno); |
1faeff08 MR |
5721 | if (regaddr == -1) |
5722 | return; | |
5723 | ||
3aee8918 PA |
5724 | size = ((register_size (regcache->tdesc, regno) |
5725 | + sizeof (PTRACE_XFER_TYPE) - 1) | |
1faeff08 | 5726 | & -sizeof (PTRACE_XFER_TYPE)); |
224c3ddb | 5727 | buf = (char *) alloca (size); |
1faeff08 MR |
5728 | memset (buf, 0, size); |
5729 | ||
5730 | if (the_low_target.collect_ptrace_register) | |
5731 | the_low_target.collect_ptrace_register (regcache, regno, buf); | |
5732 | else | |
5733 | collect_register (regcache, regno, buf); | |
5734 | ||
0bfdf32f | 5735 | pid = lwpid_of (current_thread); |
1faeff08 MR |
5736 | for (i = 0; i < size; i += sizeof (PTRACE_XFER_TYPE)) |
5737 | { | |
5738 | errno = 0; | |
5739 | ptrace (PTRACE_POKEUSER, pid, | |
5740 | /* Coerce to a uintptr_t first to avoid potential gcc warning | |
5741 | about coercing an 8 byte integer to a 4 byte pointer. */ | |
b8e1b30e LM |
5742 | (PTRACE_TYPE_ARG3) (uintptr_t) regaddr, |
5743 | (PTRACE_TYPE_ARG4) *(PTRACE_XFER_TYPE *) (buf + i)); | |
1faeff08 MR |
5744 | if (errno != 0) |
5745 | { | |
5746 | /* At this point, ESRCH should mean the process is | |
5747 | already gone, in which case we simply ignore attempts | |
5748 | to change its registers. See also the related | |
5749 | comment in linux_resume_one_lwp. */ | |
5750 | if (errno == ESRCH) | |
5751 | return; | |
5752 | ||
5753 | if ((*the_low_target.cannot_store_register) (regno) == 0) | |
5754 | error ("writing register %d: %s", regno, strerror (errno)); | |
5755 | } | |
5756 | regaddr += sizeof (PTRACE_XFER_TYPE); | |
5757 | } | |
5758 | } | |
5759 | ||
5760 | /* Fetch all registers, or just one, from the child process. | |
5761 | If REGNO is -1, do this for all registers, skipping any that are | |
5762 | assumed to have been retrieved by regsets_fetch_inferior_registers, | |
5763 | unless ALL is non-zero. | |
5764 | Otherwise, REGNO specifies which register (so we can save time). */ | |
5765 | static void | |
3aee8918 PA |
5766 | usr_fetch_inferior_registers (const struct regs_info *regs_info, |
5767 | struct regcache *regcache, int regno, int all) | |
1faeff08 | 5768 | { |
3aee8918 PA |
5769 | struct usrregs_info *usr = regs_info->usrregs; |
5770 | ||
1faeff08 MR |
5771 | if (regno == -1) |
5772 | { | |
3aee8918 PA |
5773 | for (regno = 0; regno < usr->num_regs; regno++) |
5774 | if (all || !linux_register_in_regsets (regs_info, regno)) | |
5775 | fetch_register (usr, regcache, regno); | |
1faeff08 MR |
5776 | } |
5777 | else | |
3aee8918 | 5778 | fetch_register (usr, regcache, regno); |
1faeff08 MR |
5779 | } |
5780 | ||
5781 | /* Store our register values back into the inferior. | |
5782 | If REGNO is -1, do this for all registers, skipping any that are | |
5783 | assumed to have been saved by regsets_store_inferior_registers, | |
5784 | unless ALL is non-zero. | |
5785 | Otherwise, REGNO specifies which register (so we can save time). */ | |
5786 | static void | |
3aee8918 PA |
5787 | usr_store_inferior_registers (const struct regs_info *regs_info, |
5788 | struct regcache *regcache, int regno, int all) | |
1faeff08 | 5789 | { |
3aee8918 PA |
5790 | struct usrregs_info *usr = regs_info->usrregs; |
5791 | ||
1faeff08 MR |
5792 | if (regno == -1) |
5793 | { | |
3aee8918 PA |
5794 | for (regno = 0; regno < usr->num_regs; regno++) |
5795 | if (all || !linux_register_in_regsets (regs_info, regno)) | |
5796 | store_register (usr, regcache, regno); | |
1faeff08 MR |
5797 | } |
5798 | else | |
3aee8918 | 5799 | store_register (usr, regcache, regno); |
1faeff08 MR |
5800 | } |
5801 | ||
5802 | #else /* !HAVE_LINUX_USRREGS */ | |
5803 | ||
3aee8918 PA |
5804 | #define usr_fetch_inferior_registers(regs_info, regcache, regno, all) do {} while (0) |
5805 | #define usr_store_inferior_registers(regs_info, regcache, regno, all) do {} while (0) | |
1faeff08 | 5806 | |
58caa3dc | 5807 | #endif |
1faeff08 MR |
5808 | |
5809 | ||
5b3da067 | 5810 | static void |
1faeff08 MR |
5811 | linux_fetch_registers (struct regcache *regcache, int regno) |
5812 | { | |
5813 | int use_regsets; | |
5814 | int all = 0; | |
3aee8918 | 5815 | const struct regs_info *regs_info = (*the_low_target.regs_info) (); |
1faeff08 MR |
5816 | |
5817 | if (regno == -1) | |
5818 | { | |
3aee8918 PA |
5819 | if (the_low_target.fetch_register != NULL |
5820 | && regs_info->usrregs != NULL) | |
5821 | for (regno = 0; regno < regs_info->usrregs->num_regs; regno++) | |
c14dfd32 PA |
5822 | (*the_low_target.fetch_register) (regcache, regno); |
5823 | ||
3aee8918 PA |
5824 | all = regsets_fetch_inferior_registers (regs_info->regsets_info, regcache); |
5825 | if (regs_info->usrregs != NULL) | |
5826 | usr_fetch_inferior_registers (regs_info, regcache, -1, all); | |
1faeff08 MR |
5827 | } |
5828 | else | |
5829 | { | |
c14dfd32 PA |
5830 | if (the_low_target.fetch_register != NULL |
5831 | && (*the_low_target.fetch_register) (regcache, regno)) | |
5832 | return; | |
5833 | ||
3aee8918 | 5834 | use_regsets = linux_register_in_regsets (regs_info, regno); |
1faeff08 | 5835 | if (use_regsets) |
3aee8918 PA |
5836 | all = regsets_fetch_inferior_registers (regs_info->regsets_info, |
5837 | regcache); | |
5838 | if ((!use_regsets || all) && regs_info->usrregs != NULL) | |
5839 | usr_fetch_inferior_registers (regs_info, regcache, regno, 1); | |
1faeff08 | 5840 | } |
58caa3dc DJ |
5841 | } |
5842 | ||
5b3da067 | 5843 | static void |
442ea881 | 5844 | linux_store_registers (struct regcache *regcache, int regno) |
58caa3dc | 5845 | { |
1faeff08 MR |
5846 | int use_regsets; |
5847 | int all = 0; | |
3aee8918 | 5848 | const struct regs_info *regs_info = (*the_low_target.regs_info) (); |
1faeff08 MR |
5849 | |
5850 | if (regno == -1) | |
5851 | { | |
3aee8918 PA |
5852 | all = regsets_store_inferior_registers (regs_info->regsets_info, |
5853 | regcache); | |
5854 | if (regs_info->usrregs != NULL) | |
5855 | usr_store_inferior_registers (regs_info, regcache, regno, all); | |
1faeff08 MR |
5856 | } |
5857 | else | |
5858 | { | |
3aee8918 | 5859 | use_regsets = linux_register_in_regsets (regs_info, regno); |
1faeff08 | 5860 | if (use_regsets) |
3aee8918 PA |
5861 | all = regsets_store_inferior_registers (regs_info->regsets_info, |
5862 | regcache); | |
5863 | if ((!use_regsets || all) && regs_info->usrregs != NULL) | |
5864 | usr_store_inferior_registers (regs_info, regcache, regno, 1); | |
1faeff08 | 5865 | } |
58caa3dc DJ |
5866 | } |
5867 | ||
da6d8c04 | 5868 | |
da6d8c04 DJ |
5869 | /* Copy LEN bytes from inferior's memory starting at MEMADDR |
5870 | to debugger memory starting at MYADDR. */ | |
5871 | ||
c3e735a6 | 5872 | static int |
f450004a | 5873 | linux_read_memory (CORE_ADDR memaddr, unsigned char *myaddr, int len) |
da6d8c04 | 5874 | { |
0bfdf32f | 5875 | int pid = lwpid_of (current_thread); |
4934b29e MR |
5876 | register PTRACE_XFER_TYPE *buffer; |
5877 | register CORE_ADDR addr; | |
5878 | register int count; | |
5879 | char filename[64]; | |
da6d8c04 | 5880 | register int i; |
4934b29e | 5881 | int ret; |
fd462a61 | 5882 | int fd; |
fd462a61 DJ |
5883 | |
5884 | /* Try using /proc. Don't bother for one word. */ | |
5885 | if (len >= 3 * sizeof (long)) | |
5886 | { | |
4934b29e MR |
5887 | int bytes; |
5888 | ||
fd462a61 DJ |
5889 | /* We could keep this file open and cache it - possibly one per |
5890 | thread. That requires some juggling, but is even faster. */ | |
95954743 | 5891 | sprintf (filename, "/proc/%d/mem", pid); |
fd462a61 DJ |
5892 | fd = open (filename, O_RDONLY | O_LARGEFILE); |
5893 | if (fd == -1) | |
5894 | goto no_proc; | |
5895 | ||
5896 | /* If pread64 is available, use it. It's faster if the kernel | |
5897 | supports it (only one syscall), and it's 64-bit safe even on | |
5898 | 32-bit platforms (for instance, SPARC debugging a SPARC64 | |
5899 | application). */ | |
5900 | #ifdef HAVE_PREAD64 | |
4934b29e | 5901 | bytes = pread64 (fd, myaddr, len, memaddr); |
fd462a61 | 5902 | #else |
4934b29e MR |
5903 | bytes = -1; |
5904 | if (lseek (fd, memaddr, SEEK_SET) != -1) | |
5905 | bytes = read (fd, myaddr, len); | |
fd462a61 | 5906 | #endif |
fd462a61 DJ |
5907 | |
5908 | close (fd); | |
4934b29e MR |
5909 | if (bytes == len) |
5910 | return 0; | |
5911 | ||
5912 | /* Some data was read, we'll try to get the rest with ptrace. */ | |
5913 | if (bytes > 0) | |
5914 | { | |
5915 | memaddr += bytes; | |
5916 | myaddr += bytes; | |
5917 | len -= bytes; | |
5918 | } | |
fd462a61 | 5919 | } |
da6d8c04 | 5920 | |
fd462a61 | 5921 | no_proc: |
4934b29e MR |
5922 | /* Round starting address down to longword boundary. */ |
5923 | addr = memaddr & -(CORE_ADDR) sizeof (PTRACE_XFER_TYPE); | |
5924 | /* Round ending address up; get number of longwords that makes. */ | |
5925 | count = ((((memaddr + len) - addr) + sizeof (PTRACE_XFER_TYPE) - 1) | |
5926 | / sizeof (PTRACE_XFER_TYPE)); | |
5927 | /* Allocate buffer of that many longwords. */ | |
8d749320 | 5928 | buffer = XALLOCAVEC (PTRACE_XFER_TYPE, count); |
4934b29e | 5929 | |
da6d8c04 | 5930 | /* Read all the longwords */ |
4934b29e | 5931 | errno = 0; |
da6d8c04 DJ |
5932 | for (i = 0; i < count; i++, addr += sizeof (PTRACE_XFER_TYPE)) |
5933 | { | |
14ce3065 DE |
5934 | /* Coerce the 3rd arg to a uintptr_t first to avoid potential gcc warning |
5935 | about coercing an 8 byte integer to a 4 byte pointer. */ | |
5936 | buffer[i] = ptrace (PTRACE_PEEKTEXT, pid, | |
b8e1b30e LM |
5937 | (PTRACE_TYPE_ARG3) (uintptr_t) addr, |
5938 | (PTRACE_TYPE_ARG4) 0); | |
c3e735a6 | 5939 | if (errno) |
4934b29e | 5940 | break; |
da6d8c04 | 5941 | } |
4934b29e | 5942 | ret = errno; |
da6d8c04 DJ |
5943 | |
5944 | /* Copy appropriate bytes out of the buffer. */ | |
8d409d16 MR |
5945 | if (i > 0) |
5946 | { | |
5947 | i *= sizeof (PTRACE_XFER_TYPE); | |
5948 | i -= memaddr & (sizeof (PTRACE_XFER_TYPE) - 1); | |
5949 | memcpy (myaddr, | |
5950 | (char *) buffer + (memaddr & (sizeof (PTRACE_XFER_TYPE) - 1)), | |
5951 | i < len ? i : len); | |
5952 | } | |
c3e735a6 | 5953 | |
4934b29e | 5954 | return ret; |
da6d8c04 DJ |
5955 | } |
5956 | ||
93ae6fdc PA |
5957 | /* Copy LEN bytes of data from debugger memory at MYADDR to inferior's |
5958 | memory at MEMADDR. On failure (cannot write to the inferior) | |
f0ae6fc3 | 5959 | returns the value of errno. Always succeeds if LEN is zero. */ |
da6d8c04 | 5960 | |
ce3a066d | 5961 | static int |
f450004a | 5962 | linux_write_memory (CORE_ADDR memaddr, const unsigned char *myaddr, int len) |
da6d8c04 DJ |
5963 | { |
5964 | register int i; | |
5965 | /* Round starting address down to longword boundary. */ | |
5966 | register CORE_ADDR addr = memaddr & -(CORE_ADDR) sizeof (PTRACE_XFER_TYPE); | |
5967 | /* Round ending address up; get number of longwords that makes. */ | |
5968 | register int count | |
493e2a69 MS |
5969 | = (((memaddr + len) - addr) + sizeof (PTRACE_XFER_TYPE) - 1) |
5970 | / sizeof (PTRACE_XFER_TYPE); | |
5971 | ||
da6d8c04 | 5972 | /* Allocate buffer of that many longwords. */ |
8d749320 | 5973 | register PTRACE_XFER_TYPE *buffer = XALLOCAVEC (PTRACE_XFER_TYPE, count); |
493e2a69 | 5974 | |
0bfdf32f | 5975 | int pid = lwpid_of (current_thread); |
da6d8c04 | 5976 | |
f0ae6fc3 PA |
5977 | if (len == 0) |
5978 | { | |
5979 | /* Zero length write always succeeds. */ | |
5980 | return 0; | |
5981 | } | |
5982 | ||
0d62e5e8 DJ |
5983 | if (debug_threads) |
5984 | { | |
58d6951d | 5985 | /* Dump up to four bytes. */ |
bf47e248 PA |
5986 | char str[4 * 2 + 1]; |
5987 | char *p = str; | |
5988 | int dump = len < 4 ? len : 4; | |
5989 | ||
5990 | for (i = 0; i < dump; i++) | |
5991 | { | |
5992 | sprintf (p, "%02x", myaddr[i]); | |
5993 | p += 2; | |
5994 | } | |
5995 | *p = '\0'; | |
5996 | ||
5997 | debug_printf ("Writing %s to 0x%08lx in process %d\n", | |
5998 | str, (long) memaddr, pid); | |
0d62e5e8 DJ |
5999 | } |
6000 | ||
da6d8c04 DJ |
6001 | /* Fill start and end extra bytes of buffer with existing memory data. */ |
6002 | ||
93ae6fdc | 6003 | errno = 0; |
14ce3065 DE |
6004 | /* Coerce the 3rd arg to a uintptr_t first to avoid potential gcc warning |
6005 | about coercing an 8 byte integer to a 4 byte pointer. */ | |
6006 | buffer[0] = ptrace (PTRACE_PEEKTEXT, pid, | |
b8e1b30e LM |
6007 | (PTRACE_TYPE_ARG3) (uintptr_t) addr, |
6008 | (PTRACE_TYPE_ARG4) 0); | |
93ae6fdc PA |
6009 | if (errno) |
6010 | return errno; | |
da6d8c04 DJ |
6011 | |
6012 | if (count > 1) | |
6013 | { | |
93ae6fdc | 6014 | errno = 0; |
da6d8c04 | 6015 | buffer[count - 1] |
95954743 | 6016 | = ptrace (PTRACE_PEEKTEXT, pid, |
14ce3065 DE |
6017 | /* Coerce to a uintptr_t first to avoid potential gcc warning |
6018 | about coercing an 8 byte integer to a 4 byte pointer. */ | |
b8e1b30e | 6019 | (PTRACE_TYPE_ARG3) (uintptr_t) (addr + (count - 1) |
14ce3065 | 6020 | * sizeof (PTRACE_XFER_TYPE)), |
b8e1b30e | 6021 | (PTRACE_TYPE_ARG4) 0); |
93ae6fdc PA |
6022 | if (errno) |
6023 | return errno; | |
da6d8c04 DJ |
6024 | } |
6025 | ||
93ae6fdc | 6026 | /* Copy data to be written over corresponding part of buffer. */ |
da6d8c04 | 6027 | |
493e2a69 MS |
6028 | memcpy ((char *) buffer + (memaddr & (sizeof (PTRACE_XFER_TYPE) - 1)), |
6029 | myaddr, len); | |
da6d8c04 DJ |
6030 | |
6031 | /* Write the entire buffer. */ | |
6032 | ||
6033 | for (i = 0; i < count; i++, addr += sizeof (PTRACE_XFER_TYPE)) | |
6034 | { | |
6035 | errno = 0; | |
14ce3065 DE |
6036 | ptrace (PTRACE_POKETEXT, pid, |
6037 | /* Coerce to a uintptr_t first to avoid potential gcc warning | |
6038 | about coercing an 8 byte integer to a 4 byte pointer. */ | |
b8e1b30e LM |
6039 | (PTRACE_TYPE_ARG3) (uintptr_t) addr, |
6040 | (PTRACE_TYPE_ARG4) buffer[i]); | |
da6d8c04 DJ |
6041 | if (errno) |
6042 | return errno; | |
6043 | } | |
6044 | ||
6045 | return 0; | |
6046 | } | |
2f2893d9 DJ |
6047 | |
6048 | static void | |
6049 | linux_look_up_symbols (void) | |
6050 | { | |
0d62e5e8 | 6051 | #ifdef USE_THREAD_DB |
95954743 PA |
6052 | struct process_info *proc = current_process (); |
6053 | ||
fe978cb0 | 6054 | if (proc->priv->thread_db != NULL) |
0d62e5e8 DJ |
6055 | return; |
6056 | ||
9b4c5f87 | 6057 | thread_db_init (); |
0d62e5e8 DJ |
6058 | #endif |
6059 | } | |
6060 | ||
e5379b03 | 6061 | static void |
ef57601b | 6062 | linux_request_interrupt (void) |
e5379b03 | 6063 | { |
a1928bad | 6064 | extern unsigned long signal_pid; |
e5379b03 | 6065 | |
78708b7c PA |
6066 | /* Send a SIGINT to the process group. This acts just like the user |
6067 | typed a ^C on the controlling terminal. */ | |
6068 | kill (-signal_pid, SIGINT); | |
e5379b03 DJ |
6069 | } |
6070 | ||
aa691b87 RM |
6071 | /* Copy LEN bytes from inferior's auxiliary vector starting at OFFSET |
6072 | to debugger memory starting at MYADDR. */ | |
6073 | ||
6074 | static int | |
f450004a | 6075 | linux_read_auxv (CORE_ADDR offset, unsigned char *myaddr, unsigned int len) |
aa691b87 RM |
6076 | { |
6077 | char filename[PATH_MAX]; | |
6078 | int fd, n; | |
0bfdf32f | 6079 | int pid = lwpid_of (current_thread); |
aa691b87 | 6080 | |
6cebaf6e | 6081 | xsnprintf (filename, sizeof filename, "/proc/%d/auxv", pid); |
aa691b87 RM |
6082 | |
6083 | fd = open (filename, O_RDONLY); | |
6084 | if (fd < 0) | |
6085 | return -1; | |
6086 | ||
6087 | if (offset != (CORE_ADDR) 0 | |
6088 | && lseek (fd, (off_t) offset, SEEK_SET) != (off_t) offset) | |
6089 | n = -1; | |
6090 | else | |
6091 | n = read (fd, myaddr, len); | |
6092 | ||
6093 | close (fd); | |
6094 | ||
6095 | return n; | |
6096 | } | |
6097 | ||
d993e290 PA |
6098 | /* These breakpoint and watchpoint related wrapper functions simply |
6099 | pass on the function call if the target has registered a | |
6100 | corresponding function. */ | |
e013ee27 OF |
6101 | |
6102 | static int | |
802e8e6d PA |
6103 | linux_supports_z_point_type (char z_type) |
6104 | { | |
6105 | return (the_low_target.supports_z_point_type != NULL | |
6106 | && the_low_target.supports_z_point_type (z_type)); | |
6107 | } | |
6108 | ||
6109 | static int | |
6110 | linux_insert_point (enum raw_bkpt_type type, CORE_ADDR addr, | |
6111 | int size, struct raw_breakpoint *bp) | |
e013ee27 | 6112 | { |
c8f4bfdd YQ |
6113 | if (type == raw_bkpt_type_sw) |
6114 | return insert_memory_breakpoint (bp); | |
6115 | else if (the_low_target.insert_point != NULL) | |
802e8e6d | 6116 | return the_low_target.insert_point (type, addr, size, bp); |
e013ee27 OF |
6117 | else |
6118 | /* Unsupported (see target.h). */ | |
6119 | return 1; | |
6120 | } | |
6121 | ||
6122 | static int | |
802e8e6d PA |
6123 | linux_remove_point (enum raw_bkpt_type type, CORE_ADDR addr, |
6124 | int size, struct raw_breakpoint *bp) | |
e013ee27 | 6125 | { |
c8f4bfdd YQ |
6126 | if (type == raw_bkpt_type_sw) |
6127 | return remove_memory_breakpoint (bp); | |
6128 | else if (the_low_target.remove_point != NULL) | |
802e8e6d | 6129 | return the_low_target.remove_point (type, addr, size, bp); |
e013ee27 OF |
6130 | else |
6131 | /* Unsupported (see target.h). */ | |
6132 | return 1; | |
6133 | } | |
6134 | ||
3e572f71 PA |
6135 | /* Implement the to_stopped_by_sw_breakpoint target_ops |
6136 | method. */ | |
6137 | ||
6138 | static int | |
6139 | linux_stopped_by_sw_breakpoint (void) | |
6140 | { | |
6141 | struct lwp_info *lwp = get_thread_lwp (current_thread); | |
6142 | ||
6143 | return (lwp->stop_reason == TARGET_STOPPED_BY_SW_BREAKPOINT); | |
6144 | } | |
6145 | ||
6146 | /* Implement the to_supports_stopped_by_sw_breakpoint target_ops | |
6147 | method. */ | |
6148 | ||
6149 | static int | |
6150 | linux_supports_stopped_by_sw_breakpoint (void) | |
6151 | { | |
6152 | return USE_SIGTRAP_SIGINFO; | |
6153 | } | |
6154 | ||
6155 | /* Implement the to_stopped_by_hw_breakpoint target_ops | |
6156 | method. */ | |
6157 | ||
6158 | static int | |
6159 | linux_stopped_by_hw_breakpoint (void) | |
6160 | { | |
6161 | struct lwp_info *lwp = get_thread_lwp (current_thread); | |
6162 | ||
6163 | return (lwp->stop_reason == TARGET_STOPPED_BY_HW_BREAKPOINT); | |
6164 | } | |
6165 | ||
6166 | /* Implement the to_supports_stopped_by_hw_breakpoint target_ops | |
6167 | method. */ | |
6168 | ||
6169 | static int | |
6170 | linux_supports_stopped_by_hw_breakpoint (void) | |
6171 | { | |
6172 | return USE_SIGTRAP_SIGINFO; | |
6173 | } | |
6174 | ||
70b90b91 | 6175 | /* Implement the supports_hardware_single_step target_ops method. */ |
45614f15 YQ |
6176 | |
6177 | static int | |
70b90b91 | 6178 | linux_supports_hardware_single_step (void) |
45614f15 | 6179 | { |
45614f15 YQ |
6180 | return can_hardware_single_step (); |
6181 | } | |
6182 | ||
7d00775e AT |
6183 | static int |
6184 | linux_supports_software_single_step (void) | |
6185 | { | |
6186 | return can_software_single_step (); | |
6187 | } | |
6188 | ||
e013ee27 OF |
6189 | static int |
6190 | linux_stopped_by_watchpoint (void) | |
6191 | { | |
0bfdf32f | 6192 | struct lwp_info *lwp = get_thread_lwp (current_thread); |
c3adc08c | 6193 | |
15c66dd6 | 6194 | return lwp->stop_reason == TARGET_STOPPED_BY_WATCHPOINT; |
e013ee27 OF |
6195 | } |
6196 | ||
6197 | static CORE_ADDR | |
6198 | linux_stopped_data_address (void) | |
6199 | { | |
0bfdf32f | 6200 | struct lwp_info *lwp = get_thread_lwp (current_thread); |
c3adc08c PA |
6201 | |
6202 | return lwp->stopped_data_address; | |
e013ee27 OF |
6203 | } |
6204 | ||
db0dfaa0 LM |
6205 | #if defined(__UCLIBC__) && defined(HAS_NOMMU) \ |
6206 | && defined(PT_TEXT_ADDR) && defined(PT_DATA_ADDR) \ | |
6207 | && defined(PT_TEXT_END_ADDR) | |
6208 | ||
6209 | /* This is only used for targets that define PT_TEXT_ADDR, | |
6210 | PT_DATA_ADDR and PT_TEXT_END_ADDR. If those are not defined, supposedly | |
6211 | the target has different ways of acquiring this information, like | |
6212 | loadmaps. */ | |
52fb6437 NS |
6213 | |
6214 | /* Under uClinux, programs are loaded at non-zero offsets, which we need | |
6215 | to tell gdb about. */ | |
6216 | ||
6217 | static int | |
6218 | linux_read_offsets (CORE_ADDR *text_p, CORE_ADDR *data_p) | |
6219 | { | |
52fb6437 | 6220 | unsigned long text, text_end, data; |
62828379 | 6221 | int pid = lwpid_of (current_thread); |
52fb6437 NS |
6222 | |
6223 | errno = 0; | |
6224 | ||
b8e1b30e LM |
6225 | text = ptrace (PTRACE_PEEKUSER, pid, (PTRACE_TYPE_ARG3) PT_TEXT_ADDR, |
6226 | (PTRACE_TYPE_ARG4) 0); | |
6227 | text_end = ptrace (PTRACE_PEEKUSER, pid, (PTRACE_TYPE_ARG3) PT_TEXT_END_ADDR, | |
6228 | (PTRACE_TYPE_ARG4) 0); | |
6229 | data = ptrace (PTRACE_PEEKUSER, pid, (PTRACE_TYPE_ARG3) PT_DATA_ADDR, | |
6230 | (PTRACE_TYPE_ARG4) 0); | |
52fb6437 NS |
6231 | |
6232 | if (errno == 0) | |
6233 | { | |
6234 | /* Both text and data offsets produced at compile-time (and so | |
1b3f6016 PA |
6235 | used by gdb) are relative to the beginning of the program, |
6236 | with the data segment immediately following the text segment. | |
6237 | However, the actual runtime layout in memory may put the data | |
6238 | somewhere else, so when we send gdb a data base-address, we | |
6239 | use the real data base address and subtract the compile-time | |
6240 | data base-address from it (which is just the length of the | |
6241 | text segment). BSS immediately follows data in both | |
6242 | cases. */ | |
52fb6437 NS |
6243 | *text_p = text; |
6244 | *data_p = data - (text_end - text); | |
1b3f6016 | 6245 | |
52fb6437 NS |
6246 | return 1; |
6247 | } | |
52fb6437 NS |
6248 | return 0; |
6249 | } | |
6250 | #endif | |
6251 | ||
07e059b5 VP |
6252 | static int |
6253 | linux_qxfer_osdata (const char *annex, | |
1b3f6016 PA |
6254 | unsigned char *readbuf, unsigned const char *writebuf, |
6255 | CORE_ADDR offset, int len) | |
07e059b5 | 6256 | { |
d26e3629 | 6257 | return linux_common_xfer_osdata (annex, readbuf, offset, len); |
07e059b5 VP |
6258 | } |
6259 | ||
d0722149 DE |
6260 | /* Convert a native/host siginfo object, into/from the siginfo in the |
6261 | layout of the inferiors' architecture. */ | |
6262 | ||
6263 | static void | |
8adce034 | 6264 | siginfo_fixup (siginfo_t *siginfo, gdb_byte *inf_siginfo, int direction) |
d0722149 DE |
6265 | { |
6266 | int done = 0; | |
6267 | ||
6268 | if (the_low_target.siginfo_fixup != NULL) | |
6269 | done = the_low_target.siginfo_fixup (siginfo, inf_siginfo, direction); | |
6270 | ||
6271 | /* If there was no callback, or the callback didn't do anything, | |
6272 | then just do a straight memcpy. */ | |
6273 | if (!done) | |
6274 | { | |
6275 | if (direction == 1) | |
a5362b9a | 6276 | memcpy (siginfo, inf_siginfo, sizeof (siginfo_t)); |
d0722149 | 6277 | else |
a5362b9a | 6278 | memcpy (inf_siginfo, siginfo, sizeof (siginfo_t)); |
d0722149 DE |
6279 | } |
6280 | } | |
6281 | ||
4aa995e1 PA |
6282 | static int |
6283 | linux_xfer_siginfo (const char *annex, unsigned char *readbuf, | |
6284 | unsigned const char *writebuf, CORE_ADDR offset, int len) | |
6285 | { | |
d0722149 | 6286 | int pid; |
a5362b9a | 6287 | siginfo_t siginfo; |
8adce034 | 6288 | gdb_byte inf_siginfo[sizeof (siginfo_t)]; |
4aa995e1 | 6289 | |
0bfdf32f | 6290 | if (current_thread == NULL) |
4aa995e1 PA |
6291 | return -1; |
6292 | ||
0bfdf32f | 6293 | pid = lwpid_of (current_thread); |
4aa995e1 PA |
6294 | |
6295 | if (debug_threads) | |
87ce2a04 DE |
6296 | debug_printf ("%s siginfo for lwp %d.\n", |
6297 | readbuf != NULL ? "Reading" : "Writing", | |
6298 | pid); | |
4aa995e1 | 6299 | |
0adea5f7 | 6300 | if (offset >= sizeof (siginfo)) |
4aa995e1 PA |
6301 | return -1; |
6302 | ||
b8e1b30e | 6303 | if (ptrace (PTRACE_GETSIGINFO, pid, (PTRACE_TYPE_ARG3) 0, &siginfo) != 0) |
4aa995e1 PA |
6304 | return -1; |
6305 | ||
d0722149 DE |
6306 | /* When GDBSERVER is built as a 64-bit application, ptrace writes into |
6307 | SIGINFO an object with 64-bit layout. Since debugging a 32-bit | |
6308 | inferior with a 64-bit GDBSERVER should look the same as debugging it | |
6309 | with a 32-bit GDBSERVER, we need to convert it. */ | |
6310 | siginfo_fixup (&siginfo, inf_siginfo, 0); | |
6311 | ||
4aa995e1 PA |
6312 | if (offset + len > sizeof (siginfo)) |
6313 | len = sizeof (siginfo) - offset; | |
6314 | ||
6315 | if (readbuf != NULL) | |
d0722149 | 6316 | memcpy (readbuf, inf_siginfo + offset, len); |
4aa995e1 PA |
6317 | else |
6318 | { | |
d0722149 DE |
6319 | memcpy (inf_siginfo + offset, writebuf, len); |
6320 | ||
6321 | /* Convert back to ptrace layout before flushing it out. */ | |
6322 | siginfo_fixup (&siginfo, inf_siginfo, 1); | |
6323 | ||
b8e1b30e | 6324 | if (ptrace (PTRACE_SETSIGINFO, pid, (PTRACE_TYPE_ARG3) 0, &siginfo) != 0) |
4aa995e1 PA |
6325 | return -1; |
6326 | } | |
6327 | ||
6328 | return len; | |
6329 | } | |
6330 | ||
bd99dc85 PA |
6331 | /* SIGCHLD handler that serves two purposes: In non-stop/async mode, |
6332 | so we notice when children change state; as the handler for the | |
6333 | sigsuspend in my_waitpid. */ | |
6334 | ||
6335 | static void | |
6336 | sigchld_handler (int signo) | |
6337 | { | |
6338 | int old_errno = errno; | |
6339 | ||
6340 | if (debug_threads) | |
e581f2b4 PA |
6341 | { |
6342 | do | |
6343 | { | |
6344 | /* fprintf is not async-signal-safe, so call write | |
6345 | directly. */ | |
6346 | if (write (2, "sigchld_handler\n", | |
6347 | sizeof ("sigchld_handler\n") - 1) < 0) | |
6348 | break; /* just ignore */ | |
6349 | } while (0); | |
6350 | } | |
bd99dc85 PA |
6351 | |
6352 | if (target_is_async_p ()) | |
6353 | async_file_mark (); /* trigger a linux_wait */ | |
6354 | ||
6355 | errno = old_errno; | |
6356 | } | |
6357 | ||
6358 | static int | |
6359 | linux_supports_non_stop (void) | |
6360 | { | |
6361 | return 1; | |
6362 | } | |
6363 | ||
6364 | static int | |
6365 | linux_async (int enable) | |
6366 | { | |
7089dca4 | 6367 | int previous = target_is_async_p (); |
bd99dc85 | 6368 | |
8336d594 | 6369 | if (debug_threads) |
87ce2a04 DE |
6370 | debug_printf ("linux_async (%d), previous=%d\n", |
6371 | enable, previous); | |
8336d594 | 6372 | |
bd99dc85 PA |
6373 | if (previous != enable) |
6374 | { | |
6375 | sigset_t mask; | |
6376 | sigemptyset (&mask); | |
6377 | sigaddset (&mask, SIGCHLD); | |
6378 | ||
6379 | sigprocmask (SIG_BLOCK, &mask, NULL); | |
6380 | ||
6381 | if (enable) | |
6382 | { | |
6383 | if (pipe (linux_event_pipe) == -1) | |
aa96c426 GB |
6384 | { |
6385 | linux_event_pipe[0] = -1; | |
6386 | linux_event_pipe[1] = -1; | |
6387 | sigprocmask (SIG_UNBLOCK, &mask, NULL); | |
6388 | ||
6389 | warning ("creating event pipe failed."); | |
6390 | return previous; | |
6391 | } | |
bd99dc85 PA |
6392 | |
6393 | fcntl (linux_event_pipe[0], F_SETFL, O_NONBLOCK); | |
6394 | fcntl (linux_event_pipe[1], F_SETFL, O_NONBLOCK); | |
6395 | ||
6396 | /* Register the event loop handler. */ | |
6397 | add_file_handler (linux_event_pipe[0], | |
6398 | handle_target_event, NULL); | |
6399 | ||
6400 | /* Always trigger a linux_wait. */ | |
6401 | async_file_mark (); | |
6402 | } | |
6403 | else | |
6404 | { | |
6405 | delete_file_handler (linux_event_pipe[0]); | |
6406 | ||
6407 | close (linux_event_pipe[0]); | |
6408 | close (linux_event_pipe[1]); | |
6409 | linux_event_pipe[0] = -1; | |
6410 | linux_event_pipe[1] = -1; | |
6411 | } | |
6412 | ||
6413 | sigprocmask (SIG_UNBLOCK, &mask, NULL); | |
6414 | } | |
6415 | ||
6416 | return previous; | |
6417 | } | |
6418 | ||
6419 | static int | |
6420 | linux_start_non_stop (int nonstop) | |
6421 | { | |
6422 | /* Register or unregister from event-loop accordingly. */ | |
6423 | linux_async (nonstop); | |
aa96c426 GB |
6424 | |
6425 | if (target_is_async_p () != (nonstop != 0)) | |
6426 | return -1; | |
6427 | ||
bd99dc85 PA |
6428 | return 0; |
6429 | } | |
6430 | ||
cf8fd78b PA |
6431 | static int |
6432 | linux_supports_multi_process (void) | |
6433 | { | |
6434 | return 1; | |
6435 | } | |
6436 | ||
89245bc0 DB |
6437 | /* Check if fork events are supported. */ |
6438 | ||
6439 | static int | |
6440 | linux_supports_fork_events (void) | |
6441 | { | |
6442 | return linux_supports_tracefork (); | |
6443 | } | |
6444 | ||
6445 | /* Check if vfork events are supported. */ | |
6446 | ||
6447 | static int | |
6448 | linux_supports_vfork_events (void) | |
6449 | { | |
6450 | return linux_supports_tracefork (); | |
6451 | } | |
6452 | ||
94585166 DB |
6453 | /* Check if exec events are supported. */ |
6454 | ||
6455 | static int | |
6456 | linux_supports_exec_events (void) | |
6457 | { | |
6458 | return linux_supports_traceexec (); | |
6459 | } | |
6460 | ||
de0d863e DB |
6461 | /* Callback for 'find_inferior'. Set the (possibly changed) ptrace |
6462 | options for the specified lwp. */ | |
6463 | ||
6464 | static int | |
6465 | reset_lwp_ptrace_options_callback (struct inferior_list_entry *entry, | |
6466 | void *args) | |
6467 | { | |
6468 | struct thread_info *thread = (struct thread_info *) entry; | |
6469 | struct lwp_info *lwp = get_thread_lwp (thread); | |
6470 | ||
6471 | if (!lwp->stopped) | |
6472 | { | |
6473 | /* Stop the lwp so we can modify its ptrace options. */ | |
6474 | lwp->must_set_ptrace_flags = 1; | |
6475 | linux_stop_lwp (lwp); | |
6476 | } | |
6477 | else | |
6478 | { | |
6479 | /* Already stopped; go ahead and set the ptrace options. */ | |
6480 | struct process_info *proc = find_process_pid (pid_of (thread)); | |
6481 | int options = linux_low_ptrace_options (proc->attached); | |
6482 | ||
6483 | linux_enable_event_reporting (lwpid_of (thread), options); | |
6484 | lwp->must_set_ptrace_flags = 0; | |
6485 | } | |
6486 | ||
6487 | return 0; | |
6488 | } | |
6489 | ||
6490 | /* Target hook for 'handle_new_gdb_connection'. Causes a reset of the | |
6491 | ptrace flags for all inferiors. This is in case the new GDB connection | |
6492 | doesn't support the same set of events that the previous one did. */ | |
6493 | ||
6494 | static void | |
6495 | linux_handle_new_gdb_connection (void) | |
6496 | { | |
6497 | pid_t pid; | |
6498 | ||
6499 | /* Request that all the lwps reset their ptrace options. */ | |
6500 | find_inferior (&all_threads, reset_lwp_ptrace_options_callback , &pid); | |
6501 | } | |
6502 | ||
03583c20 UW |
6503 | static int |
6504 | linux_supports_disable_randomization (void) | |
6505 | { | |
6506 | #ifdef HAVE_PERSONALITY | |
6507 | return 1; | |
6508 | #else | |
6509 | return 0; | |
6510 | #endif | |
6511 | } | |
efcbbd14 | 6512 | |
d1feda86 YQ |
6513 | static int |
6514 | linux_supports_agent (void) | |
6515 | { | |
6516 | return 1; | |
6517 | } | |
6518 | ||
c2d6af84 PA |
6519 | static int |
6520 | linux_supports_range_stepping (void) | |
6521 | { | |
c3805894 YQ |
6522 | if (can_software_single_step ()) |
6523 | return 1; | |
c2d6af84 PA |
6524 | if (*the_low_target.supports_range_stepping == NULL) |
6525 | return 0; | |
6526 | ||
6527 | return (*the_low_target.supports_range_stepping) (); | |
6528 | } | |
6529 | ||
efcbbd14 UW |
6530 | /* Enumerate spufs IDs for process PID. */ |
6531 | static int | |
6532 | spu_enumerate_spu_ids (long pid, unsigned char *buf, CORE_ADDR offset, int len) | |
6533 | { | |
6534 | int pos = 0; | |
6535 | int written = 0; | |
6536 | char path[128]; | |
6537 | DIR *dir; | |
6538 | struct dirent *entry; | |
6539 | ||
6540 | sprintf (path, "/proc/%ld/fd", pid); | |
6541 | dir = opendir (path); | |
6542 | if (!dir) | |
6543 | return -1; | |
6544 | ||
6545 | rewinddir (dir); | |
6546 | while ((entry = readdir (dir)) != NULL) | |
6547 | { | |
6548 | struct stat st; | |
6549 | struct statfs stfs; | |
6550 | int fd; | |
6551 | ||
6552 | fd = atoi (entry->d_name); | |
6553 | if (!fd) | |
6554 | continue; | |
6555 | ||
6556 | sprintf (path, "/proc/%ld/fd/%d", pid, fd); | |
6557 | if (stat (path, &st) != 0) | |
6558 | continue; | |
6559 | if (!S_ISDIR (st.st_mode)) | |
6560 | continue; | |
6561 | ||
6562 | if (statfs (path, &stfs) != 0) | |
6563 | continue; | |
6564 | if (stfs.f_type != SPUFS_MAGIC) | |
6565 | continue; | |
6566 | ||
6567 | if (pos >= offset && pos + 4 <= offset + len) | |
6568 | { | |
6569 | *(unsigned int *)(buf + pos - offset) = fd; | |
6570 | written += 4; | |
6571 | } | |
6572 | pos += 4; | |
6573 | } | |
6574 | ||
6575 | closedir (dir); | |
6576 | return written; | |
6577 | } | |
6578 | ||
6579 | /* Implements the to_xfer_partial interface for the TARGET_OBJECT_SPU | |
6580 | object type, using the /proc file system. */ | |
6581 | static int | |
6582 | linux_qxfer_spu (const char *annex, unsigned char *readbuf, | |
6583 | unsigned const char *writebuf, | |
6584 | CORE_ADDR offset, int len) | |
6585 | { | |
0bfdf32f | 6586 | long pid = lwpid_of (current_thread); |
efcbbd14 UW |
6587 | char buf[128]; |
6588 | int fd = 0; | |
6589 | int ret = 0; | |
6590 | ||
6591 | if (!writebuf && !readbuf) | |
6592 | return -1; | |
6593 | ||
6594 | if (!*annex) | |
6595 | { | |
6596 | if (!readbuf) | |
6597 | return -1; | |
6598 | else | |
6599 | return spu_enumerate_spu_ids (pid, readbuf, offset, len); | |
6600 | } | |
6601 | ||
6602 | sprintf (buf, "/proc/%ld/fd/%s", pid, annex); | |
6603 | fd = open (buf, writebuf? O_WRONLY : O_RDONLY); | |
6604 | if (fd <= 0) | |
6605 | return -1; | |
6606 | ||
6607 | if (offset != 0 | |
6608 | && lseek (fd, (off_t) offset, SEEK_SET) != (off_t) offset) | |
6609 | { | |
6610 | close (fd); | |
6611 | return 0; | |
6612 | } | |
6613 | ||
6614 | if (writebuf) | |
6615 | ret = write (fd, writebuf, (size_t) len); | |
6616 | else | |
6617 | ret = read (fd, readbuf, (size_t) len); | |
6618 | ||
6619 | close (fd); | |
6620 | return ret; | |
6621 | } | |
6622 | ||
723b724b | 6623 | #if defined PT_GETDSBT || defined PTRACE_GETFDPIC |
78d85199 YQ |
6624 | struct target_loadseg |
6625 | { | |
6626 | /* Core address to which the segment is mapped. */ | |
6627 | Elf32_Addr addr; | |
6628 | /* VMA recorded in the program header. */ | |
6629 | Elf32_Addr p_vaddr; | |
6630 | /* Size of this segment in memory. */ | |
6631 | Elf32_Word p_memsz; | |
6632 | }; | |
6633 | ||
723b724b | 6634 | # if defined PT_GETDSBT |
78d85199 YQ |
6635 | struct target_loadmap |
6636 | { | |
6637 | /* Protocol version number, must be zero. */ | |
6638 | Elf32_Word version; | |
6639 | /* Pointer to the DSBT table, its size, and the DSBT index. */ | |
6640 | unsigned *dsbt_table; | |
6641 | unsigned dsbt_size, dsbt_index; | |
6642 | /* Number of segments in this map. */ | |
6643 | Elf32_Word nsegs; | |
6644 | /* The actual memory map. */ | |
6645 | struct target_loadseg segs[/*nsegs*/]; | |
6646 | }; | |
723b724b MF |
6647 | # define LINUX_LOADMAP PT_GETDSBT |
6648 | # define LINUX_LOADMAP_EXEC PTRACE_GETDSBT_EXEC | |
6649 | # define LINUX_LOADMAP_INTERP PTRACE_GETDSBT_INTERP | |
6650 | # else | |
6651 | struct target_loadmap | |
6652 | { | |
6653 | /* Protocol version number, must be zero. */ | |
6654 | Elf32_Half version; | |
6655 | /* Number of segments in this map. */ | |
6656 | Elf32_Half nsegs; | |
6657 | /* The actual memory map. */ | |
6658 | struct target_loadseg segs[/*nsegs*/]; | |
6659 | }; | |
6660 | # define LINUX_LOADMAP PTRACE_GETFDPIC | |
6661 | # define LINUX_LOADMAP_EXEC PTRACE_GETFDPIC_EXEC | |
6662 | # define LINUX_LOADMAP_INTERP PTRACE_GETFDPIC_INTERP | |
6663 | # endif | |
78d85199 | 6664 | |
78d85199 YQ |
6665 | static int |
6666 | linux_read_loadmap (const char *annex, CORE_ADDR offset, | |
6667 | unsigned char *myaddr, unsigned int len) | |
6668 | { | |
0bfdf32f | 6669 | int pid = lwpid_of (current_thread); |
78d85199 YQ |
6670 | int addr = -1; |
6671 | struct target_loadmap *data = NULL; | |
6672 | unsigned int actual_length, copy_length; | |
6673 | ||
6674 | if (strcmp (annex, "exec") == 0) | |
723b724b | 6675 | addr = (int) LINUX_LOADMAP_EXEC; |
78d85199 | 6676 | else if (strcmp (annex, "interp") == 0) |
723b724b | 6677 | addr = (int) LINUX_LOADMAP_INTERP; |
78d85199 YQ |
6678 | else |
6679 | return -1; | |
6680 | ||
723b724b | 6681 | if (ptrace (LINUX_LOADMAP, pid, addr, &data) != 0) |
78d85199 YQ |
6682 | return -1; |
6683 | ||
6684 | if (data == NULL) | |
6685 | return -1; | |
6686 | ||
6687 | actual_length = sizeof (struct target_loadmap) | |
6688 | + sizeof (struct target_loadseg) * data->nsegs; | |
6689 | ||
6690 | if (offset < 0 || offset > actual_length) | |
6691 | return -1; | |
6692 | ||
6693 | copy_length = actual_length - offset < len ? actual_length - offset : len; | |
6694 | memcpy (myaddr, (char *) data + offset, copy_length); | |
6695 | return copy_length; | |
6696 | } | |
723b724b MF |
6697 | #else |
6698 | # define linux_read_loadmap NULL | |
6699 | #endif /* defined PT_GETDSBT || defined PTRACE_GETFDPIC */ | |
78d85199 | 6700 | |
1570b33e | 6701 | static void |
06e03fff | 6702 | linux_process_qsupported (char **features, int count) |
1570b33e L |
6703 | { |
6704 | if (the_low_target.process_qsupported != NULL) | |
06e03fff | 6705 | the_low_target.process_qsupported (features, count); |
1570b33e L |
6706 | } |
6707 | ||
82075af2 JS |
6708 | static int |
6709 | linux_supports_catch_syscall (void) | |
6710 | { | |
6711 | return (the_low_target.get_syscall_trapinfo != NULL | |
6712 | && linux_supports_tracesysgood ()); | |
6713 | } | |
6714 | ||
ae91f625 MK |
6715 | static int |
6716 | linux_get_ipa_tdesc_idx (void) | |
6717 | { | |
6718 | if (the_low_target.get_ipa_tdesc_idx == NULL) | |
6719 | return 0; | |
6720 | ||
6721 | return (*the_low_target.get_ipa_tdesc_idx) (); | |
6722 | } | |
6723 | ||
219f2f23 PA |
6724 | static int |
6725 | linux_supports_tracepoints (void) | |
6726 | { | |
6727 | if (*the_low_target.supports_tracepoints == NULL) | |
6728 | return 0; | |
6729 | ||
6730 | return (*the_low_target.supports_tracepoints) (); | |
6731 | } | |
6732 | ||
6733 | static CORE_ADDR | |
6734 | linux_read_pc (struct regcache *regcache) | |
6735 | { | |
6736 | if (the_low_target.get_pc == NULL) | |
6737 | return 0; | |
6738 | ||
6739 | return (*the_low_target.get_pc) (regcache); | |
6740 | } | |
6741 | ||
6742 | static void | |
6743 | linux_write_pc (struct regcache *regcache, CORE_ADDR pc) | |
6744 | { | |
6745 | gdb_assert (the_low_target.set_pc != NULL); | |
6746 | ||
6747 | (*the_low_target.set_pc) (regcache, pc); | |
6748 | } | |
6749 | ||
8336d594 PA |
6750 | static int |
6751 | linux_thread_stopped (struct thread_info *thread) | |
6752 | { | |
6753 | return get_thread_lwp (thread)->stopped; | |
6754 | } | |
6755 | ||
6756 | /* This exposes stop-all-threads functionality to other modules. */ | |
6757 | ||
6758 | static void | |
7984d532 | 6759 | linux_pause_all (int freeze) |
8336d594 | 6760 | { |
7984d532 PA |
6761 | stop_all_lwps (freeze, NULL); |
6762 | } | |
6763 | ||
6764 | /* This exposes unstop-all-threads functionality to other gdbserver | |
6765 | modules. */ | |
6766 | ||
6767 | static void | |
6768 | linux_unpause_all (int unfreeze) | |
6769 | { | |
6770 | unstop_all_lwps (unfreeze, NULL); | |
8336d594 PA |
6771 | } |
6772 | ||
90d74c30 PA |
6773 | static int |
6774 | linux_prepare_to_access_memory (void) | |
6775 | { | |
6776 | /* Neither ptrace nor /proc/PID/mem allow accessing memory through a | |
6777 | running LWP. */ | |
6778 | if (non_stop) | |
6779 | linux_pause_all (1); | |
6780 | return 0; | |
6781 | } | |
6782 | ||
6783 | static void | |
0146f85b | 6784 | linux_done_accessing_memory (void) |
90d74c30 PA |
6785 | { |
6786 | /* Neither ptrace nor /proc/PID/mem allow accessing memory through a | |
6787 | running LWP. */ | |
6788 | if (non_stop) | |
6789 | linux_unpause_all (1); | |
6790 | } | |
6791 | ||
fa593d66 PA |
6792 | static int |
6793 | linux_install_fast_tracepoint_jump_pad (CORE_ADDR tpoint, CORE_ADDR tpaddr, | |
6794 | CORE_ADDR collector, | |
6795 | CORE_ADDR lockaddr, | |
6796 | ULONGEST orig_size, | |
6797 | CORE_ADDR *jump_entry, | |
405f8e94 SS |
6798 | CORE_ADDR *trampoline, |
6799 | ULONGEST *trampoline_size, | |
fa593d66 PA |
6800 | unsigned char *jjump_pad_insn, |
6801 | ULONGEST *jjump_pad_insn_size, | |
6802 | CORE_ADDR *adjusted_insn_addr, | |
405f8e94 SS |
6803 | CORE_ADDR *adjusted_insn_addr_end, |
6804 | char *err) | |
fa593d66 PA |
6805 | { |
6806 | return (*the_low_target.install_fast_tracepoint_jump_pad) | |
6807 | (tpoint, tpaddr, collector, lockaddr, orig_size, | |
405f8e94 SS |
6808 | jump_entry, trampoline, trampoline_size, |
6809 | jjump_pad_insn, jjump_pad_insn_size, | |
6810 | adjusted_insn_addr, adjusted_insn_addr_end, | |
6811 | err); | |
fa593d66 PA |
6812 | } |
6813 | ||
6a271cae PA |
6814 | static struct emit_ops * |
6815 | linux_emit_ops (void) | |
6816 | { | |
6817 | if (the_low_target.emit_ops != NULL) | |
6818 | return (*the_low_target.emit_ops) (); | |
6819 | else | |
6820 | return NULL; | |
6821 | } | |
6822 | ||
405f8e94 SS |
6823 | static int |
6824 | linux_get_min_fast_tracepoint_insn_len (void) | |
6825 | { | |
6826 | return (*the_low_target.get_min_fast_tracepoint_insn_len) (); | |
6827 | } | |
6828 | ||
2268b414 JK |
6829 | /* Extract &phdr and num_phdr in the inferior. Return 0 on success. */ |
6830 | ||
6831 | static int | |
6832 | get_phdr_phnum_from_proc_auxv (const int pid, const int is_elf64, | |
6833 | CORE_ADDR *phdr_memaddr, int *num_phdr) | |
6834 | { | |
6835 | char filename[PATH_MAX]; | |
6836 | int fd; | |
6837 | const int auxv_size = is_elf64 | |
6838 | ? sizeof (Elf64_auxv_t) : sizeof (Elf32_auxv_t); | |
6839 | char buf[sizeof (Elf64_auxv_t)]; /* The larger of the two. */ | |
6840 | ||
6841 | xsnprintf (filename, sizeof filename, "/proc/%d/auxv", pid); | |
6842 | ||
6843 | fd = open (filename, O_RDONLY); | |
6844 | if (fd < 0) | |
6845 | return 1; | |
6846 | ||
6847 | *phdr_memaddr = 0; | |
6848 | *num_phdr = 0; | |
6849 | while (read (fd, buf, auxv_size) == auxv_size | |
6850 | && (*phdr_memaddr == 0 || *num_phdr == 0)) | |
6851 | { | |
6852 | if (is_elf64) | |
6853 | { | |
6854 | Elf64_auxv_t *const aux = (Elf64_auxv_t *) buf; | |
6855 | ||
6856 | switch (aux->a_type) | |
6857 | { | |
6858 | case AT_PHDR: | |
6859 | *phdr_memaddr = aux->a_un.a_val; | |
6860 | break; | |
6861 | case AT_PHNUM: | |
6862 | *num_phdr = aux->a_un.a_val; | |
6863 | break; | |
6864 | } | |
6865 | } | |
6866 | else | |
6867 | { | |
6868 | Elf32_auxv_t *const aux = (Elf32_auxv_t *) buf; | |
6869 | ||
6870 | switch (aux->a_type) | |
6871 | { | |
6872 | case AT_PHDR: | |
6873 | *phdr_memaddr = aux->a_un.a_val; | |
6874 | break; | |
6875 | case AT_PHNUM: | |
6876 | *num_phdr = aux->a_un.a_val; | |
6877 | break; | |
6878 | } | |
6879 | } | |
6880 | } | |
6881 | ||
6882 | close (fd); | |
6883 | ||
6884 | if (*phdr_memaddr == 0 || *num_phdr == 0) | |
6885 | { | |
6886 | warning ("Unexpected missing AT_PHDR and/or AT_PHNUM: " | |
6887 | "phdr_memaddr = %ld, phdr_num = %d", | |
6888 | (long) *phdr_memaddr, *num_phdr); | |
6889 | return 2; | |
6890 | } | |
6891 | ||
6892 | return 0; | |
6893 | } | |
6894 | ||
6895 | /* Return &_DYNAMIC (via PT_DYNAMIC) in the inferior, or 0 if not present. */ | |
6896 | ||
6897 | static CORE_ADDR | |
6898 | get_dynamic (const int pid, const int is_elf64) | |
6899 | { | |
6900 | CORE_ADDR phdr_memaddr, relocation; | |
db1ff28b | 6901 | int num_phdr, i; |
2268b414 | 6902 | unsigned char *phdr_buf; |
db1ff28b | 6903 | const int phdr_size = is_elf64 ? sizeof (Elf64_Phdr) : sizeof (Elf32_Phdr); |
2268b414 JK |
6904 | |
6905 | if (get_phdr_phnum_from_proc_auxv (pid, is_elf64, &phdr_memaddr, &num_phdr)) | |
6906 | return 0; | |
6907 | ||
6908 | gdb_assert (num_phdr < 100); /* Basic sanity check. */ | |
224c3ddb | 6909 | phdr_buf = (unsigned char *) alloca (num_phdr * phdr_size); |
2268b414 JK |
6910 | |
6911 | if (linux_read_memory (phdr_memaddr, phdr_buf, num_phdr * phdr_size)) | |
6912 | return 0; | |
6913 | ||
6914 | /* Compute relocation: it is expected to be 0 for "regular" executables, | |
6915 | non-zero for PIE ones. */ | |
6916 | relocation = -1; | |
db1ff28b JK |
6917 | for (i = 0; relocation == -1 && i < num_phdr; i++) |
6918 | if (is_elf64) | |
6919 | { | |
6920 | Elf64_Phdr *const p = (Elf64_Phdr *) (phdr_buf + i * phdr_size); | |
6921 | ||
6922 | if (p->p_type == PT_PHDR) | |
6923 | relocation = phdr_memaddr - p->p_vaddr; | |
6924 | } | |
6925 | else | |
6926 | { | |
6927 | Elf32_Phdr *const p = (Elf32_Phdr *) (phdr_buf + i * phdr_size); | |
6928 | ||
6929 | if (p->p_type == PT_PHDR) | |
6930 | relocation = phdr_memaddr - p->p_vaddr; | |
6931 | } | |
6932 | ||
2268b414 JK |
6933 | if (relocation == -1) |
6934 | { | |
e237a7e2 JK |
6935 | /* PT_PHDR is optional, but necessary for PIE in general. Fortunately |
6936 | any real world executables, including PIE executables, have always | |
6937 | PT_PHDR present. PT_PHDR is not present in some shared libraries or | |
6938 | in fpc (Free Pascal 2.4) binaries but neither of those have a need for | |
6939 | or present DT_DEBUG anyway (fpc binaries are statically linked). | |
6940 | ||
6941 | Therefore if there exists DT_DEBUG there is always also PT_PHDR. | |
6942 | ||
6943 | GDB could find RELOCATION also from AT_ENTRY - e_entry. */ | |
6944 | ||
2268b414 JK |
6945 | return 0; |
6946 | } | |
6947 | ||
db1ff28b JK |
6948 | for (i = 0; i < num_phdr; i++) |
6949 | { | |
6950 | if (is_elf64) | |
6951 | { | |
6952 | Elf64_Phdr *const p = (Elf64_Phdr *) (phdr_buf + i * phdr_size); | |
6953 | ||
6954 | if (p->p_type == PT_DYNAMIC) | |
6955 | return p->p_vaddr + relocation; | |
6956 | } | |
6957 | else | |
6958 | { | |
6959 | Elf32_Phdr *const p = (Elf32_Phdr *) (phdr_buf + i * phdr_size); | |
2268b414 | 6960 | |
db1ff28b JK |
6961 | if (p->p_type == PT_DYNAMIC) |
6962 | return p->p_vaddr + relocation; | |
6963 | } | |
6964 | } | |
2268b414 JK |
6965 | |
6966 | return 0; | |
6967 | } | |
6968 | ||
6969 | /* Return &_r_debug in the inferior, or -1 if not present. Return value | |
367ba2c2 MR |
6970 | can be 0 if the inferior does not yet have the library list initialized. |
6971 | We look for DT_MIPS_RLD_MAP first. MIPS executables use this instead of | |
6972 | DT_DEBUG, although they sometimes contain an unused DT_DEBUG entry too. */ | |
2268b414 JK |
6973 | |
6974 | static CORE_ADDR | |
6975 | get_r_debug (const int pid, const int is_elf64) | |
6976 | { | |
6977 | CORE_ADDR dynamic_memaddr; | |
6978 | const int dyn_size = is_elf64 ? sizeof (Elf64_Dyn) : sizeof (Elf32_Dyn); | |
6979 | unsigned char buf[sizeof (Elf64_Dyn)]; /* The larger of the two. */ | |
367ba2c2 | 6980 | CORE_ADDR map = -1; |
2268b414 JK |
6981 | |
6982 | dynamic_memaddr = get_dynamic (pid, is_elf64); | |
6983 | if (dynamic_memaddr == 0) | |
367ba2c2 | 6984 | return map; |
2268b414 JK |
6985 | |
6986 | while (linux_read_memory (dynamic_memaddr, buf, dyn_size) == 0) | |
6987 | { | |
6988 | if (is_elf64) | |
6989 | { | |
6990 | Elf64_Dyn *const dyn = (Elf64_Dyn *) buf; | |
a738da3a | 6991 | #if defined DT_MIPS_RLD_MAP || defined DT_MIPS_RLD_MAP_REL |
367ba2c2 MR |
6992 | union |
6993 | { | |
6994 | Elf64_Xword map; | |
6995 | unsigned char buf[sizeof (Elf64_Xword)]; | |
6996 | } | |
6997 | rld_map; | |
a738da3a MF |
6998 | #endif |
6999 | #ifdef DT_MIPS_RLD_MAP | |
367ba2c2 MR |
7000 | if (dyn->d_tag == DT_MIPS_RLD_MAP) |
7001 | { | |
7002 | if (linux_read_memory (dyn->d_un.d_val, | |
7003 | rld_map.buf, sizeof (rld_map.buf)) == 0) | |
7004 | return rld_map.map; | |
7005 | else | |
7006 | break; | |
7007 | } | |
75f62ce7 | 7008 | #endif /* DT_MIPS_RLD_MAP */ |
a738da3a MF |
7009 | #ifdef DT_MIPS_RLD_MAP_REL |
7010 | if (dyn->d_tag == DT_MIPS_RLD_MAP_REL) | |
7011 | { | |
7012 | if (linux_read_memory (dyn->d_un.d_val + dynamic_memaddr, | |
7013 | rld_map.buf, sizeof (rld_map.buf)) == 0) | |
7014 | return rld_map.map; | |
7015 | else | |
7016 | break; | |
7017 | } | |
7018 | #endif /* DT_MIPS_RLD_MAP_REL */ | |
2268b414 | 7019 | |
367ba2c2 MR |
7020 | if (dyn->d_tag == DT_DEBUG && map == -1) |
7021 | map = dyn->d_un.d_val; | |
2268b414 JK |
7022 | |
7023 | if (dyn->d_tag == DT_NULL) | |
7024 | break; | |
7025 | } | |
7026 | else | |
7027 | { | |
7028 | Elf32_Dyn *const dyn = (Elf32_Dyn *) buf; | |
a738da3a | 7029 | #if defined DT_MIPS_RLD_MAP || defined DT_MIPS_RLD_MAP_REL |
367ba2c2 MR |
7030 | union |
7031 | { | |
7032 | Elf32_Word map; | |
7033 | unsigned char buf[sizeof (Elf32_Word)]; | |
7034 | } | |
7035 | rld_map; | |
a738da3a MF |
7036 | #endif |
7037 | #ifdef DT_MIPS_RLD_MAP | |
367ba2c2 MR |
7038 | if (dyn->d_tag == DT_MIPS_RLD_MAP) |
7039 | { | |
7040 | if (linux_read_memory (dyn->d_un.d_val, | |
7041 | rld_map.buf, sizeof (rld_map.buf)) == 0) | |
7042 | return rld_map.map; | |
7043 | else | |
7044 | break; | |
7045 | } | |
75f62ce7 | 7046 | #endif /* DT_MIPS_RLD_MAP */ |
a738da3a MF |
7047 | #ifdef DT_MIPS_RLD_MAP_REL |
7048 | if (dyn->d_tag == DT_MIPS_RLD_MAP_REL) | |
7049 | { | |
7050 | if (linux_read_memory (dyn->d_un.d_val + dynamic_memaddr, | |
7051 | rld_map.buf, sizeof (rld_map.buf)) == 0) | |
7052 | return rld_map.map; | |
7053 | else | |
7054 | break; | |
7055 | } | |
7056 | #endif /* DT_MIPS_RLD_MAP_REL */ | |
2268b414 | 7057 | |
367ba2c2 MR |
7058 | if (dyn->d_tag == DT_DEBUG && map == -1) |
7059 | map = dyn->d_un.d_val; | |
2268b414 JK |
7060 | |
7061 | if (dyn->d_tag == DT_NULL) | |
7062 | break; | |
7063 | } | |
7064 | ||
7065 | dynamic_memaddr += dyn_size; | |
7066 | } | |
7067 | ||
367ba2c2 | 7068 | return map; |
2268b414 JK |
7069 | } |
7070 | ||
7071 | /* Read one pointer from MEMADDR in the inferior. */ | |
7072 | ||
7073 | static int | |
7074 | read_one_ptr (CORE_ADDR memaddr, CORE_ADDR *ptr, int ptr_size) | |
7075 | { | |
485f1ee4 PA |
7076 | int ret; |
7077 | ||
7078 | /* Go through a union so this works on either big or little endian | |
7079 | hosts, when the inferior's pointer size is smaller than the size | |
7080 | of CORE_ADDR. It is assumed the inferior's endianness is the | |
7081 | same of the superior's. */ | |
7082 | union | |
7083 | { | |
7084 | CORE_ADDR core_addr; | |
7085 | unsigned int ui; | |
7086 | unsigned char uc; | |
7087 | } addr; | |
7088 | ||
7089 | ret = linux_read_memory (memaddr, &addr.uc, ptr_size); | |
7090 | if (ret == 0) | |
7091 | { | |
7092 | if (ptr_size == sizeof (CORE_ADDR)) | |
7093 | *ptr = addr.core_addr; | |
7094 | else if (ptr_size == sizeof (unsigned int)) | |
7095 | *ptr = addr.ui; | |
7096 | else | |
7097 | gdb_assert_not_reached ("unhandled pointer size"); | |
7098 | } | |
7099 | return ret; | |
2268b414 JK |
7100 | } |
7101 | ||
7102 | struct link_map_offsets | |
7103 | { | |
7104 | /* Offset and size of r_debug.r_version. */ | |
7105 | int r_version_offset; | |
7106 | ||
7107 | /* Offset and size of r_debug.r_map. */ | |
7108 | int r_map_offset; | |
7109 | ||
7110 | /* Offset to l_addr field in struct link_map. */ | |
7111 | int l_addr_offset; | |
7112 | ||
7113 | /* Offset to l_name field in struct link_map. */ | |
7114 | int l_name_offset; | |
7115 | ||
7116 | /* Offset to l_ld field in struct link_map. */ | |
7117 | int l_ld_offset; | |
7118 | ||
7119 | /* Offset to l_next field in struct link_map. */ | |
7120 | int l_next_offset; | |
7121 | ||
7122 | /* Offset to l_prev field in struct link_map. */ | |
7123 | int l_prev_offset; | |
7124 | }; | |
7125 | ||
fb723180 | 7126 | /* Construct qXfer:libraries-svr4:read reply. */ |
2268b414 JK |
7127 | |
7128 | static int | |
7129 | linux_qxfer_libraries_svr4 (const char *annex, unsigned char *readbuf, | |
7130 | unsigned const char *writebuf, | |
7131 | CORE_ADDR offset, int len) | |
7132 | { | |
7133 | char *document; | |
7134 | unsigned document_len; | |
fe978cb0 | 7135 | struct process_info_private *const priv = current_process ()->priv; |
2268b414 JK |
7136 | char filename[PATH_MAX]; |
7137 | int pid, is_elf64; | |
7138 | ||
7139 | static const struct link_map_offsets lmo_32bit_offsets = | |
7140 | { | |
7141 | 0, /* r_version offset. */ | |
7142 | 4, /* r_debug.r_map offset. */ | |
7143 | 0, /* l_addr offset in link_map. */ | |
7144 | 4, /* l_name offset in link_map. */ | |
7145 | 8, /* l_ld offset in link_map. */ | |
7146 | 12, /* l_next offset in link_map. */ | |
7147 | 16 /* l_prev offset in link_map. */ | |
7148 | }; | |
7149 | ||
7150 | static const struct link_map_offsets lmo_64bit_offsets = | |
7151 | { | |
7152 | 0, /* r_version offset. */ | |
7153 | 8, /* r_debug.r_map offset. */ | |
7154 | 0, /* l_addr offset in link_map. */ | |
7155 | 8, /* l_name offset in link_map. */ | |
7156 | 16, /* l_ld offset in link_map. */ | |
7157 | 24, /* l_next offset in link_map. */ | |
7158 | 32 /* l_prev offset in link_map. */ | |
7159 | }; | |
7160 | const struct link_map_offsets *lmo; | |
214d508e | 7161 | unsigned int machine; |
b1fbec62 GB |
7162 | int ptr_size; |
7163 | CORE_ADDR lm_addr = 0, lm_prev = 0; | |
7164 | int allocated = 1024; | |
7165 | char *p; | |
7166 | CORE_ADDR l_name, l_addr, l_ld, l_next, l_prev; | |
7167 | int header_done = 0; | |
2268b414 JK |
7168 | |
7169 | if (writebuf != NULL) | |
7170 | return -2; | |
7171 | if (readbuf == NULL) | |
7172 | return -1; | |
7173 | ||
0bfdf32f | 7174 | pid = lwpid_of (current_thread); |
2268b414 | 7175 | xsnprintf (filename, sizeof filename, "/proc/%d/exe", pid); |
214d508e | 7176 | is_elf64 = elf_64_file_p (filename, &machine); |
2268b414 | 7177 | lmo = is_elf64 ? &lmo_64bit_offsets : &lmo_32bit_offsets; |
b1fbec62 | 7178 | ptr_size = is_elf64 ? 8 : 4; |
2268b414 | 7179 | |
b1fbec62 GB |
7180 | while (annex[0] != '\0') |
7181 | { | |
7182 | const char *sep; | |
7183 | CORE_ADDR *addrp; | |
7184 | int len; | |
2268b414 | 7185 | |
b1fbec62 GB |
7186 | sep = strchr (annex, '='); |
7187 | if (sep == NULL) | |
7188 | break; | |
0c5bf5a9 | 7189 | |
b1fbec62 | 7190 | len = sep - annex; |
61012eef | 7191 | if (len == 5 && startswith (annex, "start")) |
b1fbec62 | 7192 | addrp = &lm_addr; |
61012eef | 7193 | else if (len == 4 && startswith (annex, "prev")) |
b1fbec62 GB |
7194 | addrp = &lm_prev; |
7195 | else | |
7196 | { | |
7197 | annex = strchr (sep, ';'); | |
7198 | if (annex == NULL) | |
7199 | break; | |
7200 | annex++; | |
7201 | continue; | |
7202 | } | |
7203 | ||
7204 | annex = decode_address_to_semicolon (addrp, sep + 1); | |
2268b414 | 7205 | } |
b1fbec62 GB |
7206 | |
7207 | if (lm_addr == 0) | |
2268b414 | 7208 | { |
b1fbec62 GB |
7209 | int r_version = 0; |
7210 | ||
7211 | if (priv->r_debug == 0) | |
7212 | priv->r_debug = get_r_debug (pid, is_elf64); | |
7213 | ||
7214 | /* We failed to find DT_DEBUG. Such situation will not change | |
7215 | for this inferior - do not retry it. Report it to GDB as | |
7216 | E01, see for the reasons at the GDB solib-svr4.c side. */ | |
7217 | if (priv->r_debug == (CORE_ADDR) -1) | |
7218 | return -1; | |
7219 | ||
7220 | if (priv->r_debug != 0) | |
2268b414 | 7221 | { |
b1fbec62 GB |
7222 | if (linux_read_memory (priv->r_debug + lmo->r_version_offset, |
7223 | (unsigned char *) &r_version, | |
7224 | sizeof (r_version)) != 0 | |
7225 | || r_version != 1) | |
7226 | { | |
7227 | warning ("unexpected r_debug version %d", r_version); | |
7228 | } | |
7229 | else if (read_one_ptr (priv->r_debug + lmo->r_map_offset, | |
7230 | &lm_addr, ptr_size) != 0) | |
7231 | { | |
7232 | warning ("unable to read r_map from 0x%lx", | |
7233 | (long) priv->r_debug + lmo->r_map_offset); | |
7234 | } | |
2268b414 | 7235 | } |
b1fbec62 | 7236 | } |
2268b414 | 7237 | |
224c3ddb | 7238 | document = (char *) xmalloc (allocated); |
b1fbec62 GB |
7239 | strcpy (document, "<library-list-svr4 version=\"1.0\""); |
7240 | p = document + strlen (document); | |
7241 | ||
7242 | while (lm_addr | |
7243 | && read_one_ptr (lm_addr + lmo->l_name_offset, | |
7244 | &l_name, ptr_size) == 0 | |
7245 | && read_one_ptr (lm_addr + lmo->l_addr_offset, | |
7246 | &l_addr, ptr_size) == 0 | |
7247 | && read_one_ptr (lm_addr + lmo->l_ld_offset, | |
7248 | &l_ld, ptr_size) == 0 | |
7249 | && read_one_ptr (lm_addr + lmo->l_prev_offset, | |
7250 | &l_prev, ptr_size) == 0 | |
7251 | && read_one_ptr (lm_addr + lmo->l_next_offset, | |
7252 | &l_next, ptr_size) == 0) | |
7253 | { | |
7254 | unsigned char libname[PATH_MAX]; | |
7255 | ||
7256 | if (lm_prev != l_prev) | |
2268b414 | 7257 | { |
b1fbec62 GB |
7258 | warning ("Corrupted shared library list: 0x%lx != 0x%lx", |
7259 | (long) lm_prev, (long) l_prev); | |
7260 | break; | |
2268b414 JK |
7261 | } |
7262 | ||
d878444c JK |
7263 | /* Ignore the first entry even if it has valid name as the first entry |
7264 | corresponds to the main executable. The first entry should not be | |
7265 | skipped if the dynamic loader was loaded late by a static executable | |
7266 | (see solib-svr4.c parameter ignore_first). But in such case the main | |
7267 | executable does not have PT_DYNAMIC present and this function already | |
7268 | exited above due to failed get_r_debug. */ | |
7269 | if (lm_prev == 0) | |
2268b414 | 7270 | { |
d878444c JK |
7271 | sprintf (p, " main-lm=\"0x%lx\"", (unsigned long) lm_addr); |
7272 | p = p + strlen (p); | |
7273 | } | |
7274 | else | |
7275 | { | |
7276 | /* Not checking for error because reading may stop before | |
7277 | we've got PATH_MAX worth of characters. */ | |
7278 | libname[0] = '\0'; | |
7279 | linux_read_memory (l_name, libname, sizeof (libname) - 1); | |
7280 | libname[sizeof (libname) - 1] = '\0'; | |
7281 | if (libname[0] != '\0') | |
2268b414 | 7282 | { |
d878444c JK |
7283 | /* 6x the size for xml_escape_text below. */ |
7284 | size_t len = 6 * strlen ((char *) libname); | |
7285 | char *name; | |
2268b414 | 7286 | |
d878444c JK |
7287 | if (!header_done) |
7288 | { | |
7289 | /* Terminate `<library-list-svr4'. */ | |
7290 | *p++ = '>'; | |
7291 | header_done = 1; | |
7292 | } | |
2268b414 | 7293 | |
db1ff28b | 7294 | while (allocated < p - document + len + 200) |
d878444c JK |
7295 | { |
7296 | /* Expand to guarantee sufficient storage. */ | |
7297 | uintptr_t document_len = p - document; | |
2268b414 | 7298 | |
224c3ddb | 7299 | document = (char *) xrealloc (document, 2 * allocated); |
d878444c JK |
7300 | allocated *= 2; |
7301 | p = document + document_len; | |
7302 | } | |
7303 | ||
7304 | name = xml_escape_text ((char *) libname); | |
7305 | p += sprintf (p, "<library name=\"%s\" lm=\"0x%lx\" " | |
db1ff28b | 7306 | "l_addr=\"0x%lx\" l_ld=\"0x%lx\"/>", |
d878444c JK |
7307 | name, (unsigned long) lm_addr, |
7308 | (unsigned long) l_addr, (unsigned long) l_ld); | |
7309 | free (name); | |
7310 | } | |
0afae3cf | 7311 | } |
b1fbec62 GB |
7312 | |
7313 | lm_prev = lm_addr; | |
7314 | lm_addr = l_next; | |
2268b414 JK |
7315 | } |
7316 | ||
b1fbec62 GB |
7317 | if (!header_done) |
7318 | { | |
7319 | /* Empty list; terminate `<library-list-svr4'. */ | |
7320 | strcpy (p, "/>"); | |
7321 | } | |
7322 | else | |
7323 | strcpy (p, "</library-list-svr4>"); | |
7324 | ||
2268b414 JK |
7325 | document_len = strlen (document); |
7326 | if (offset < document_len) | |
7327 | document_len -= offset; | |
7328 | else | |
7329 | document_len = 0; | |
7330 | if (len > document_len) | |
7331 | len = document_len; | |
7332 | ||
7333 | memcpy (readbuf, document + offset, len); | |
7334 | xfree (document); | |
7335 | ||
7336 | return len; | |
7337 | } | |
7338 | ||
9accd112 MM |
7339 | #ifdef HAVE_LINUX_BTRACE |
7340 | ||
969c39fb | 7341 | /* See to_disable_btrace target method. */ |
9accd112 | 7342 | |
969c39fb MM |
7343 | static int |
7344 | linux_low_disable_btrace (struct btrace_target_info *tinfo) | |
7345 | { | |
7346 | enum btrace_error err; | |
7347 | ||
7348 | err = linux_disable_btrace (tinfo); | |
7349 | return (err == BTRACE_ERR_NONE ? 0 : -1); | |
7350 | } | |
7351 | ||
bc504a31 | 7352 | /* Encode an Intel Processor Trace configuration. */ |
b20a6524 MM |
7353 | |
7354 | static void | |
7355 | linux_low_encode_pt_config (struct buffer *buffer, | |
7356 | const struct btrace_data_pt_config *config) | |
7357 | { | |
7358 | buffer_grow_str (buffer, "<pt-config>\n"); | |
7359 | ||
7360 | switch (config->cpu.vendor) | |
7361 | { | |
7362 | case CV_INTEL: | |
7363 | buffer_xml_printf (buffer, "<cpu vendor=\"GenuineIntel\" family=\"%u\" " | |
7364 | "model=\"%u\" stepping=\"%u\"/>\n", | |
7365 | config->cpu.family, config->cpu.model, | |
7366 | config->cpu.stepping); | |
7367 | break; | |
7368 | ||
7369 | default: | |
7370 | break; | |
7371 | } | |
7372 | ||
7373 | buffer_grow_str (buffer, "</pt-config>\n"); | |
7374 | } | |
7375 | ||
7376 | /* Encode a raw buffer. */ | |
7377 | ||
7378 | static void | |
7379 | linux_low_encode_raw (struct buffer *buffer, const gdb_byte *data, | |
7380 | unsigned int size) | |
7381 | { | |
7382 | if (size == 0) | |
7383 | return; | |
7384 | ||
7385 | /* We use hex encoding - see common/rsp-low.h. */ | |
7386 | buffer_grow_str (buffer, "<raw>\n"); | |
7387 | ||
7388 | while (size-- > 0) | |
7389 | { | |
7390 | char elem[2]; | |
7391 | ||
7392 | elem[0] = tohex ((*data >> 4) & 0xf); | |
7393 | elem[1] = tohex (*data++ & 0xf); | |
7394 | ||
7395 | buffer_grow (buffer, elem, 2); | |
7396 | } | |
7397 | ||
7398 | buffer_grow_str (buffer, "</raw>\n"); | |
7399 | } | |
7400 | ||
969c39fb MM |
7401 | /* See to_read_btrace target method. */ |
7402 | ||
7403 | static int | |
9accd112 | 7404 | linux_low_read_btrace (struct btrace_target_info *tinfo, struct buffer *buffer, |
add67df8 | 7405 | enum btrace_read_type type) |
9accd112 | 7406 | { |
734b0e4b | 7407 | struct btrace_data btrace; |
9accd112 | 7408 | struct btrace_block *block; |
969c39fb | 7409 | enum btrace_error err; |
9accd112 MM |
7410 | int i; |
7411 | ||
734b0e4b MM |
7412 | btrace_data_init (&btrace); |
7413 | ||
969c39fb MM |
7414 | err = linux_read_btrace (&btrace, tinfo, type); |
7415 | if (err != BTRACE_ERR_NONE) | |
7416 | { | |
7417 | if (err == BTRACE_ERR_OVERFLOW) | |
7418 | buffer_grow_str0 (buffer, "E.Overflow."); | |
7419 | else | |
7420 | buffer_grow_str0 (buffer, "E.Generic Error."); | |
7421 | ||
b20a6524 | 7422 | goto err; |
969c39fb | 7423 | } |
9accd112 | 7424 | |
734b0e4b MM |
7425 | switch (btrace.format) |
7426 | { | |
7427 | case BTRACE_FORMAT_NONE: | |
7428 | buffer_grow_str0 (buffer, "E.No Trace."); | |
b20a6524 | 7429 | goto err; |
734b0e4b MM |
7430 | |
7431 | case BTRACE_FORMAT_BTS: | |
7432 | buffer_grow_str (buffer, "<!DOCTYPE btrace SYSTEM \"btrace.dtd\">\n"); | |
7433 | buffer_grow_str (buffer, "<btrace version=\"1.0\">\n"); | |
9accd112 | 7434 | |
734b0e4b MM |
7435 | for (i = 0; |
7436 | VEC_iterate (btrace_block_s, btrace.variant.bts.blocks, i, block); | |
7437 | i++) | |
7438 | buffer_xml_printf (buffer, "<block begin=\"0x%s\" end=\"0x%s\"/>\n", | |
7439 | paddress (block->begin), paddress (block->end)); | |
9accd112 | 7440 | |
734b0e4b MM |
7441 | buffer_grow_str0 (buffer, "</btrace>\n"); |
7442 | break; | |
7443 | ||
b20a6524 MM |
7444 | case BTRACE_FORMAT_PT: |
7445 | buffer_grow_str (buffer, "<!DOCTYPE btrace SYSTEM \"btrace.dtd\">\n"); | |
7446 | buffer_grow_str (buffer, "<btrace version=\"1.0\">\n"); | |
7447 | buffer_grow_str (buffer, "<pt>\n"); | |
7448 | ||
7449 | linux_low_encode_pt_config (buffer, &btrace.variant.pt.config); | |
9accd112 | 7450 | |
b20a6524 MM |
7451 | linux_low_encode_raw (buffer, btrace.variant.pt.data, |
7452 | btrace.variant.pt.size); | |
7453 | ||
7454 | buffer_grow_str (buffer, "</pt>\n"); | |
7455 | buffer_grow_str0 (buffer, "</btrace>\n"); | |
7456 | break; | |
7457 | ||
7458 | default: | |
7459 | buffer_grow_str0 (buffer, "E.Unsupported Trace Format."); | |
7460 | goto err; | |
734b0e4b | 7461 | } |
969c39fb | 7462 | |
734b0e4b | 7463 | btrace_data_fini (&btrace); |
969c39fb | 7464 | return 0; |
b20a6524 MM |
7465 | |
7466 | err: | |
7467 | btrace_data_fini (&btrace); | |
7468 | return -1; | |
9accd112 | 7469 | } |
f4abbc16 MM |
7470 | |
7471 | /* See to_btrace_conf target method. */ | |
7472 | ||
7473 | static int | |
7474 | linux_low_btrace_conf (const struct btrace_target_info *tinfo, | |
7475 | struct buffer *buffer) | |
7476 | { | |
7477 | const struct btrace_config *conf; | |
7478 | ||
7479 | buffer_grow_str (buffer, "<!DOCTYPE btrace-conf SYSTEM \"btrace-conf.dtd\">\n"); | |
7480 | buffer_grow_str (buffer, "<btrace-conf version=\"1.0\">\n"); | |
7481 | ||
7482 | conf = linux_btrace_conf (tinfo); | |
7483 | if (conf != NULL) | |
7484 | { | |
7485 | switch (conf->format) | |
7486 | { | |
7487 | case BTRACE_FORMAT_NONE: | |
7488 | break; | |
7489 | ||
7490 | case BTRACE_FORMAT_BTS: | |
d33501a5 MM |
7491 | buffer_xml_printf (buffer, "<bts"); |
7492 | buffer_xml_printf (buffer, " size=\"0x%x\"", conf->bts.size); | |
7493 | buffer_xml_printf (buffer, " />\n"); | |
f4abbc16 | 7494 | break; |
b20a6524 MM |
7495 | |
7496 | case BTRACE_FORMAT_PT: | |
7497 | buffer_xml_printf (buffer, "<pt"); | |
7498 | buffer_xml_printf (buffer, " size=\"0x%x\"", conf->pt.size); | |
7499 | buffer_xml_printf (buffer, "/>\n"); | |
7500 | break; | |
f4abbc16 MM |
7501 | } |
7502 | } | |
7503 | ||
7504 | buffer_grow_str0 (buffer, "</btrace-conf>\n"); | |
7505 | return 0; | |
7506 | } | |
9accd112 MM |
7507 | #endif /* HAVE_LINUX_BTRACE */ |
7508 | ||
7b669087 GB |
7509 | /* See nat/linux-nat.h. */ |
7510 | ||
7511 | ptid_t | |
7512 | current_lwp_ptid (void) | |
7513 | { | |
7514 | return ptid_of (current_thread); | |
7515 | } | |
7516 | ||
dd373349 AT |
7517 | /* Implementation of the target_ops method "breakpoint_kind_from_pc". */ |
7518 | ||
7519 | static int | |
7520 | linux_breakpoint_kind_from_pc (CORE_ADDR *pcptr) | |
7521 | { | |
7522 | if (the_low_target.breakpoint_kind_from_pc != NULL) | |
7523 | return (*the_low_target.breakpoint_kind_from_pc) (pcptr); | |
7524 | else | |
1652a986 | 7525 | return default_breakpoint_kind_from_pc (pcptr); |
dd373349 AT |
7526 | } |
7527 | ||
7528 | /* Implementation of the target_ops method "sw_breakpoint_from_kind". */ | |
7529 | ||
7530 | static const gdb_byte * | |
7531 | linux_sw_breakpoint_from_kind (int kind, int *size) | |
7532 | { | |
7533 | gdb_assert (the_low_target.sw_breakpoint_from_kind != NULL); | |
7534 | ||
7535 | return (*the_low_target.sw_breakpoint_from_kind) (kind, size); | |
7536 | } | |
7537 | ||
769ef81f AT |
7538 | /* Implementation of the target_ops method |
7539 | "breakpoint_kind_from_current_state". */ | |
7540 | ||
7541 | static int | |
7542 | linux_breakpoint_kind_from_current_state (CORE_ADDR *pcptr) | |
7543 | { | |
7544 | if (the_low_target.breakpoint_kind_from_current_state != NULL) | |
7545 | return (*the_low_target.breakpoint_kind_from_current_state) (pcptr); | |
7546 | else | |
7547 | return linux_breakpoint_kind_from_pc (pcptr); | |
7548 | } | |
7549 | ||
276d4552 YQ |
7550 | /* Default implementation of linux_target_ops method "set_pc" for |
7551 | 32-bit pc register which is literally named "pc". */ | |
7552 | ||
7553 | void | |
7554 | linux_set_pc_32bit (struct regcache *regcache, CORE_ADDR pc) | |
7555 | { | |
7556 | uint32_t newpc = pc; | |
7557 | ||
7558 | supply_register_by_name (regcache, "pc", &newpc); | |
7559 | } | |
7560 | ||
7561 | /* Default implementation of linux_target_ops method "get_pc" for | |
7562 | 32-bit pc register which is literally named "pc". */ | |
7563 | ||
7564 | CORE_ADDR | |
7565 | linux_get_pc_32bit (struct regcache *regcache) | |
7566 | { | |
7567 | uint32_t pc; | |
7568 | ||
7569 | collect_register_by_name (regcache, "pc", &pc); | |
7570 | if (debug_threads) | |
7571 | debug_printf ("stop pc is 0x%" PRIx32 "\n", pc); | |
7572 | return pc; | |
7573 | } | |
7574 | ||
6f69e520 YQ |
7575 | /* Default implementation of linux_target_ops method "set_pc" for |
7576 | 64-bit pc register which is literally named "pc". */ | |
7577 | ||
7578 | void | |
7579 | linux_set_pc_64bit (struct regcache *regcache, CORE_ADDR pc) | |
7580 | { | |
7581 | uint64_t newpc = pc; | |
7582 | ||
7583 | supply_register_by_name (regcache, "pc", &newpc); | |
7584 | } | |
7585 | ||
7586 | /* Default implementation of linux_target_ops method "get_pc" for | |
7587 | 64-bit pc register which is literally named "pc". */ | |
7588 | ||
7589 | CORE_ADDR | |
7590 | linux_get_pc_64bit (struct regcache *regcache) | |
7591 | { | |
7592 | uint64_t pc; | |
7593 | ||
7594 | collect_register_by_name (regcache, "pc", &pc); | |
7595 | if (debug_threads) | |
7596 | debug_printf ("stop pc is 0x%" PRIx64 "\n", pc); | |
7597 | return pc; | |
7598 | } | |
7599 | ||
7600 | ||
ce3a066d DJ |
7601 | static struct target_ops linux_target_ops = { |
7602 | linux_create_inferior, | |
ece66d65 | 7603 | linux_post_create_inferior, |
ce3a066d DJ |
7604 | linux_attach, |
7605 | linux_kill, | |
6ad8ae5c | 7606 | linux_detach, |
8336d594 | 7607 | linux_mourn, |
444d6139 | 7608 | linux_join, |
ce3a066d DJ |
7609 | linux_thread_alive, |
7610 | linux_resume, | |
7611 | linux_wait, | |
7612 | linux_fetch_registers, | |
7613 | linux_store_registers, | |
90d74c30 | 7614 | linux_prepare_to_access_memory, |
0146f85b | 7615 | linux_done_accessing_memory, |
ce3a066d DJ |
7616 | linux_read_memory, |
7617 | linux_write_memory, | |
2f2893d9 | 7618 | linux_look_up_symbols, |
ef57601b | 7619 | linux_request_interrupt, |
aa691b87 | 7620 | linux_read_auxv, |
802e8e6d | 7621 | linux_supports_z_point_type, |
d993e290 PA |
7622 | linux_insert_point, |
7623 | linux_remove_point, | |
3e572f71 PA |
7624 | linux_stopped_by_sw_breakpoint, |
7625 | linux_supports_stopped_by_sw_breakpoint, | |
7626 | linux_stopped_by_hw_breakpoint, | |
7627 | linux_supports_stopped_by_hw_breakpoint, | |
70b90b91 | 7628 | linux_supports_hardware_single_step, |
e013ee27 OF |
7629 | linux_stopped_by_watchpoint, |
7630 | linux_stopped_data_address, | |
db0dfaa0 LM |
7631 | #if defined(__UCLIBC__) && defined(HAS_NOMMU) \ |
7632 | && defined(PT_TEXT_ADDR) && defined(PT_DATA_ADDR) \ | |
7633 | && defined(PT_TEXT_END_ADDR) | |
52fb6437 | 7634 | linux_read_offsets, |
dae5f5cf DJ |
7635 | #else |
7636 | NULL, | |
7637 | #endif | |
7638 | #ifdef USE_THREAD_DB | |
7639 | thread_db_get_tls_address, | |
7640 | #else | |
7641 | NULL, | |
52fb6437 | 7642 | #endif |
efcbbd14 | 7643 | linux_qxfer_spu, |
59a016f0 | 7644 | hostio_last_error_from_errno, |
07e059b5 | 7645 | linux_qxfer_osdata, |
4aa995e1 | 7646 | linux_xfer_siginfo, |
bd99dc85 PA |
7647 | linux_supports_non_stop, |
7648 | linux_async, | |
7649 | linux_start_non_stop, | |
cdbfd419 | 7650 | linux_supports_multi_process, |
89245bc0 DB |
7651 | linux_supports_fork_events, |
7652 | linux_supports_vfork_events, | |
94585166 | 7653 | linux_supports_exec_events, |
de0d863e | 7654 | linux_handle_new_gdb_connection, |
cdbfd419 | 7655 | #ifdef USE_THREAD_DB |
dc146f7c | 7656 | thread_db_handle_monitor_command, |
cdbfd419 | 7657 | #else |
dc146f7c | 7658 | NULL, |
cdbfd419 | 7659 | #endif |
d26e3629 | 7660 | linux_common_core_of_thread, |
78d85199 | 7661 | linux_read_loadmap, |
219f2f23 PA |
7662 | linux_process_qsupported, |
7663 | linux_supports_tracepoints, | |
7664 | linux_read_pc, | |
8336d594 PA |
7665 | linux_write_pc, |
7666 | linux_thread_stopped, | |
7984d532 | 7667 | NULL, |
711e434b | 7668 | linux_pause_all, |
7984d532 | 7669 | linux_unpause_all, |
fa593d66 | 7670 | linux_stabilize_threads, |
6a271cae | 7671 | linux_install_fast_tracepoint_jump_pad, |
03583c20 UW |
7672 | linux_emit_ops, |
7673 | linux_supports_disable_randomization, | |
405f8e94 | 7674 | linux_get_min_fast_tracepoint_insn_len, |
2268b414 | 7675 | linux_qxfer_libraries_svr4, |
d1feda86 | 7676 | linux_supports_agent, |
9accd112 MM |
7677 | #ifdef HAVE_LINUX_BTRACE |
7678 | linux_supports_btrace, | |
0568462b | 7679 | linux_enable_btrace, |
969c39fb | 7680 | linux_low_disable_btrace, |
9accd112 | 7681 | linux_low_read_btrace, |
f4abbc16 | 7682 | linux_low_btrace_conf, |
9accd112 MM |
7683 | #else |
7684 | NULL, | |
7685 | NULL, | |
7686 | NULL, | |
7687 | NULL, | |
f4abbc16 | 7688 | NULL, |
9accd112 | 7689 | #endif |
c2d6af84 | 7690 | linux_supports_range_stepping, |
e57f1de3 | 7691 | linux_proc_pid_to_exec_file, |
14d2069a GB |
7692 | linux_mntns_open_cloexec, |
7693 | linux_mntns_unlink, | |
7694 | linux_mntns_readlink, | |
dd373349 | 7695 | linux_breakpoint_kind_from_pc, |
79efa585 SM |
7696 | linux_sw_breakpoint_from_kind, |
7697 | linux_proc_tid_get_name, | |
7d00775e | 7698 | linux_breakpoint_kind_from_current_state, |
82075af2 JS |
7699 | linux_supports_software_single_step, |
7700 | linux_supports_catch_syscall, | |
ae91f625 | 7701 | linux_get_ipa_tdesc_idx, |
ce3a066d DJ |
7702 | }; |
7703 | ||
3aee8918 PA |
7704 | #ifdef HAVE_LINUX_REGSETS |
7705 | void | |
7706 | initialize_regsets_info (struct regsets_info *info) | |
7707 | { | |
7708 | for (info->num_regsets = 0; | |
7709 | info->regsets[info->num_regsets].size >= 0; | |
7710 | info->num_regsets++) | |
7711 | ; | |
3aee8918 PA |
7712 | } |
7713 | #endif | |
7714 | ||
da6d8c04 DJ |
7715 | void |
7716 | initialize_low (void) | |
7717 | { | |
bd99dc85 | 7718 | struct sigaction sigchld_action; |
dd373349 | 7719 | |
bd99dc85 | 7720 | memset (&sigchld_action, 0, sizeof (sigchld_action)); |
ce3a066d | 7721 | set_target_ops (&linux_target_ops); |
dd373349 | 7722 | |
aa7c7447 | 7723 | linux_ptrace_init_warnings (); |
bd99dc85 PA |
7724 | |
7725 | sigchld_action.sa_handler = sigchld_handler; | |
7726 | sigemptyset (&sigchld_action.sa_mask); | |
7727 | sigchld_action.sa_flags = SA_RESTART; | |
7728 | sigaction (SIGCHLD, &sigchld_action, NULL); | |
3aee8918 PA |
7729 | |
7730 | initialize_low_arch (); | |
89245bc0 DB |
7731 | |
7732 | linux_check_ptrace_features (); | |
da6d8c04 | 7733 | } |