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