Commit | Line | Data |
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da6d8c04 | 1 | /* Low level interface to ptrace, for the remote server for GDB. |
b811d2c2 | 2 | Copyright (C) 1995-2020 Free Software Foundation, Inc. |
da6d8c04 DJ |
3 | |
4 | This file is part of GDB. | |
5 | ||
6 | This program is free software; you can redistribute it and/or modify | |
7 | it under the terms of the GNU General Public License as published by | |
a9762ec7 | 8 | the Free Software Foundation; either version 3 of the License, or |
da6d8c04 DJ |
9 | (at your option) any later version. |
10 | ||
11 | This program is distributed in the hope that it will be useful, | |
12 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
13 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
14 | GNU General Public License for more details. | |
15 | ||
16 | You should have received a copy of the GNU General Public License | |
a9762ec7 | 17 | along with this program. If not, see <http://www.gnu.org/licenses/>. */ |
da6d8c04 DJ |
18 | |
19 | #include "server.h" | |
58caa3dc | 20 | #include "linux-low.h" |
125f8a3d | 21 | #include "nat/linux-osdata.h" |
268a13a5 | 22 | #include "gdbsupport/agent.h" |
de0d863e | 23 | #include "tdesc.h" |
268a13a5 TT |
24 | #include "gdbsupport/rsp-low.h" |
25 | #include "gdbsupport/signals-state-save-restore.h" | |
96d7229d LM |
26 | #include "nat/linux-nat.h" |
27 | #include "nat/linux-waitpid.h" | |
268a13a5 | 28 | #include "gdbsupport/gdb_wait.h" |
5826e159 | 29 | #include "nat/gdb_ptrace.h" |
125f8a3d GB |
30 | #include "nat/linux-ptrace.h" |
31 | #include "nat/linux-procfs.h" | |
8cc73a39 | 32 | #include "nat/linux-personality.h" |
da6d8c04 DJ |
33 | #include <signal.h> |
34 | #include <sys/ioctl.h> | |
35 | #include <fcntl.h> | |
0a30fbc4 | 36 | #include <unistd.h> |
fd500816 | 37 | #include <sys/syscall.h> |
f9387fc3 | 38 | #include <sched.h> |
07e059b5 VP |
39 | #include <ctype.h> |
40 | #include <pwd.h> | |
41 | #include <sys/types.h> | |
42 | #include <dirent.h> | |
53ce3c39 | 43 | #include <sys/stat.h> |
efcbbd14 | 44 | #include <sys/vfs.h> |
1570b33e | 45 | #include <sys/uio.h> |
268a13a5 | 46 | #include "gdbsupport/filestuff.h" |
c144c7a0 | 47 | #include "tracepoint.h" |
276d4552 | 48 | #include <inttypes.h> |
268a13a5 | 49 | #include "gdbsupport/common-inferior.h" |
2090129c | 50 | #include "nat/fork-inferior.h" |
268a13a5 | 51 | #include "gdbsupport/environ.h" |
21987b9c | 52 | #include "gdbsupport/gdb-sigmask.h" |
268a13a5 | 53 | #include "gdbsupport/scoped_restore.h" |
957f3f49 DE |
54 | #ifndef ELFMAG0 |
55 | /* Don't include <linux/elf.h> here. If it got included by gdb_proc_service.h | |
56 | then ELFMAG0 will have been defined. If it didn't get included by | |
57 | gdb_proc_service.h then including it will likely introduce a duplicate | |
58 | definition of elf_fpregset_t. */ | |
59 | #include <elf.h> | |
60 | #endif | |
14d2069a | 61 | #include "nat/linux-namespaces.h" |
efcbbd14 | 62 | |
03583c20 UW |
63 | #ifdef HAVE_PERSONALITY |
64 | # include <sys/personality.h> | |
65 | # if !HAVE_DECL_ADDR_NO_RANDOMIZE | |
66 | # define ADDR_NO_RANDOMIZE 0x0040000 | |
67 | # endif | |
68 | #endif | |
69 | ||
fd462a61 DJ |
70 | #ifndef O_LARGEFILE |
71 | #define O_LARGEFILE 0 | |
72 | #endif | |
1a981360 | 73 | |
69f4c9cc AH |
74 | #ifndef AT_HWCAP2 |
75 | #define AT_HWCAP2 26 | |
76 | #endif | |
77 | ||
db0dfaa0 LM |
78 | /* Some targets did not define these ptrace constants from the start, |
79 | so gdbserver defines them locally here. In the future, these may | |
80 | be removed after they are added to asm/ptrace.h. */ | |
81 | #if !(defined(PT_TEXT_ADDR) \ | |
82 | || defined(PT_DATA_ADDR) \ | |
83 | || defined(PT_TEXT_END_ADDR)) | |
84 | #if defined(__mcoldfire__) | |
85 | /* These are still undefined in 3.10 kernels. */ | |
86 | #define PT_TEXT_ADDR 49*4 | |
87 | #define PT_DATA_ADDR 50*4 | |
88 | #define PT_TEXT_END_ADDR 51*4 | |
89 | /* BFIN already defines these since at least 2.6.32 kernels. */ | |
90 | #elif defined(BFIN) | |
91 | #define PT_TEXT_ADDR 220 | |
92 | #define PT_TEXT_END_ADDR 224 | |
93 | #define PT_DATA_ADDR 228 | |
94 | /* These are still undefined in 3.10 kernels. */ | |
95 | #elif defined(__TMS320C6X__) | |
96 | #define PT_TEXT_ADDR (0x10000*4) | |
97 | #define PT_DATA_ADDR (0x10004*4) | |
98 | #define PT_TEXT_END_ADDR (0x10008*4) | |
99 | #endif | |
100 | #endif | |
101 | ||
5203ae1e TBA |
102 | #if (defined(__UCLIBC__) \ |
103 | && defined(HAS_NOMMU) \ | |
104 | && defined(PT_TEXT_ADDR) \ | |
105 | && defined(PT_DATA_ADDR) \ | |
106 | && defined(PT_TEXT_END_ADDR)) | |
107 | #define SUPPORTS_READ_OFFSETS | |
108 | #endif | |
109 | ||
9accd112 | 110 | #ifdef HAVE_LINUX_BTRACE |
125f8a3d | 111 | # include "nat/linux-btrace.h" |
268a13a5 | 112 | # include "gdbsupport/btrace-common.h" |
9accd112 MM |
113 | #endif |
114 | ||
8365dcf5 TJB |
115 | #ifndef HAVE_ELF32_AUXV_T |
116 | /* Copied from glibc's elf.h. */ | |
117 | typedef struct | |
118 | { | |
119 | uint32_t a_type; /* Entry type */ | |
120 | union | |
121 | { | |
122 | uint32_t a_val; /* Integer value */ | |
123 | /* We use to have pointer elements added here. We cannot do that, | |
124 | though, since it does not work when using 32-bit definitions | |
125 | on 64-bit platforms and vice versa. */ | |
126 | } a_un; | |
127 | } Elf32_auxv_t; | |
128 | #endif | |
129 | ||
130 | #ifndef HAVE_ELF64_AUXV_T | |
131 | /* Copied from glibc's elf.h. */ | |
132 | typedef struct | |
133 | { | |
134 | uint64_t a_type; /* Entry type */ | |
135 | union | |
136 | { | |
137 | uint64_t a_val; /* Integer value */ | |
138 | /* We use to have pointer elements added here. We cannot do that, | |
139 | though, since it does not work when using 32-bit definitions | |
140 | on 64-bit platforms and vice versa. */ | |
141 | } a_un; | |
142 | } Elf64_auxv_t; | |
143 | #endif | |
144 | ||
ded48a5e YQ |
145 | /* Does the current host support PTRACE_GETREGSET? */ |
146 | int have_ptrace_getregset = -1; | |
147 | ||
cff068da GB |
148 | /* LWP accessors. */ |
149 | ||
150 | /* See nat/linux-nat.h. */ | |
151 | ||
152 | ptid_t | |
153 | ptid_of_lwp (struct lwp_info *lwp) | |
154 | { | |
155 | return ptid_of (get_lwp_thread (lwp)); | |
156 | } | |
157 | ||
158 | /* See nat/linux-nat.h. */ | |
159 | ||
4b134ca1 GB |
160 | void |
161 | lwp_set_arch_private_info (struct lwp_info *lwp, | |
162 | struct arch_lwp_info *info) | |
163 | { | |
164 | lwp->arch_private = info; | |
165 | } | |
166 | ||
167 | /* See nat/linux-nat.h. */ | |
168 | ||
169 | struct arch_lwp_info * | |
170 | lwp_arch_private_info (struct lwp_info *lwp) | |
171 | { | |
172 | return lwp->arch_private; | |
173 | } | |
174 | ||
175 | /* See nat/linux-nat.h. */ | |
176 | ||
cff068da GB |
177 | int |
178 | lwp_is_stopped (struct lwp_info *lwp) | |
179 | { | |
180 | return lwp->stopped; | |
181 | } | |
182 | ||
183 | /* See nat/linux-nat.h. */ | |
184 | ||
185 | enum target_stop_reason | |
186 | lwp_stop_reason (struct lwp_info *lwp) | |
187 | { | |
188 | return lwp->stop_reason; | |
189 | } | |
190 | ||
0e00e962 AA |
191 | /* See nat/linux-nat.h. */ |
192 | ||
193 | int | |
194 | lwp_is_stepping (struct lwp_info *lwp) | |
195 | { | |
196 | return lwp->stepping; | |
197 | } | |
198 | ||
05044653 PA |
199 | /* A list of all unknown processes which receive stop signals. Some |
200 | other process will presumably claim each of these as forked | |
201 | children momentarily. */ | |
24a09b5f | 202 | |
05044653 PA |
203 | struct simple_pid_list |
204 | { | |
205 | /* The process ID. */ | |
206 | int pid; | |
207 | ||
208 | /* The status as reported by waitpid. */ | |
209 | int status; | |
210 | ||
211 | /* Next in chain. */ | |
212 | struct simple_pid_list *next; | |
213 | }; | |
214 | struct simple_pid_list *stopped_pids; | |
215 | ||
216 | /* Trivial list manipulation functions to keep track of a list of new | |
217 | stopped processes. */ | |
218 | ||
219 | static void | |
220 | add_to_pid_list (struct simple_pid_list **listp, int pid, int status) | |
221 | { | |
8d749320 | 222 | struct simple_pid_list *new_pid = XNEW (struct simple_pid_list); |
05044653 PA |
223 | |
224 | new_pid->pid = pid; | |
225 | new_pid->status = status; | |
226 | new_pid->next = *listp; | |
227 | *listp = new_pid; | |
228 | } | |
229 | ||
230 | static int | |
231 | pull_pid_from_list (struct simple_pid_list **listp, int pid, int *statusp) | |
232 | { | |
233 | struct simple_pid_list **p; | |
234 | ||
235 | for (p = listp; *p != NULL; p = &(*p)->next) | |
236 | if ((*p)->pid == pid) | |
237 | { | |
238 | struct simple_pid_list *next = (*p)->next; | |
239 | ||
240 | *statusp = (*p)->status; | |
241 | xfree (*p); | |
242 | *p = next; | |
243 | return 1; | |
244 | } | |
245 | return 0; | |
246 | } | |
24a09b5f | 247 | |
bde24c0a PA |
248 | enum stopping_threads_kind |
249 | { | |
250 | /* Not stopping threads presently. */ | |
251 | NOT_STOPPING_THREADS, | |
252 | ||
253 | /* Stopping threads. */ | |
254 | STOPPING_THREADS, | |
255 | ||
256 | /* Stopping and suspending threads. */ | |
257 | STOPPING_AND_SUSPENDING_THREADS | |
258 | }; | |
259 | ||
260 | /* This is set while stop_all_lwps is in effect. */ | |
261 | enum stopping_threads_kind stopping_threads = NOT_STOPPING_THREADS; | |
0d62e5e8 DJ |
262 | |
263 | /* FIXME make into a target method? */ | |
24a09b5f | 264 | int using_threads = 1; |
24a09b5f | 265 | |
fa593d66 PA |
266 | /* True if we're presently stabilizing threads (moving them out of |
267 | jump pads). */ | |
268 | static int stabilizing_threads; | |
269 | ||
f50bf8e5 | 270 | static void unsuspend_all_lwps (struct lwp_info *except); |
95954743 | 271 | static void mark_lwp_dead (struct lwp_info *lwp, int wstat); |
00db26fa | 272 | static int lwp_is_marked_dead (struct lwp_info *lwp); |
d50171e4 | 273 | static int finish_step_over (struct lwp_info *lwp); |
d50171e4 | 274 | static int kill_lwp (unsigned long lwpid, int signo); |
863d01bd | 275 | static void enqueue_pending_signal (struct lwp_info *lwp, int signal, siginfo_t *info); |
ece66d65 | 276 | static int linux_low_ptrace_options (int attached); |
ced2dffb | 277 | static int check_ptrace_stopped_lwp_gone (struct lwp_info *lp); |
d50171e4 | 278 | |
582511be PA |
279 | /* When the event-loop is doing a step-over, this points at the thread |
280 | being stepped. */ | |
281 | ptid_t step_over_bkpt; | |
282 | ||
7d00775e | 283 | /* True if the low target can hardware single-step. */ |
d50171e4 PA |
284 | |
285 | static int | |
286 | can_hardware_single_step (void) | |
287 | { | |
7d00775e AT |
288 | if (the_low_target.supports_hardware_single_step != NULL) |
289 | return the_low_target.supports_hardware_single_step (); | |
290 | else | |
291 | return 0; | |
292 | } | |
293 | ||
bf9ae9d8 TBA |
294 | bool |
295 | linux_process_target::low_supports_breakpoints () | |
296 | { | |
297 | return false; | |
298 | } | |
d50171e4 | 299 | |
bf9ae9d8 TBA |
300 | CORE_ADDR |
301 | linux_process_target::low_get_pc (regcache *regcache) | |
302 | { | |
303 | return 0; | |
304 | } | |
305 | ||
306 | void | |
307 | linux_process_target::low_set_pc (regcache *regcache, CORE_ADDR newpc) | |
d50171e4 | 308 | { |
bf9ae9d8 | 309 | gdb_assert_not_reached ("linux target op low_set_pc is not implemented"); |
d50171e4 | 310 | } |
0d62e5e8 | 311 | |
7582c77c TBA |
312 | std::vector<CORE_ADDR> |
313 | linux_process_target::low_get_next_pcs (regcache *regcache) | |
314 | { | |
315 | gdb_assert_not_reached ("linux target op low_get_next_pcs is not " | |
316 | "implemented"); | |
317 | } | |
318 | ||
d4807ea2 TBA |
319 | int |
320 | linux_process_target::low_decr_pc_after_break () | |
321 | { | |
322 | return 0; | |
323 | } | |
324 | ||
c2d6af84 PA |
325 | /* True if LWP is stopped in its stepping range. */ |
326 | ||
327 | static int | |
328 | lwp_in_step_range (struct lwp_info *lwp) | |
329 | { | |
330 | CORE_ADDR pc = lwp->stop_pc; | |
331 | ||
332 | return (pc >= lwp->step_range_start && pc < lwp->step_range_end); | |
333 | } | |
334 | ||
0d62e5e8 DJ |
335 | struct pending_signals |
336 | { | |
337 | int signal; | |
32ca6d61 | 338 | siginfo_t info; |
0d62e5e8 DJ |
339 | struct pending_signals *prev; |
340 | }; | |
611cb4a5 | 341 | |
bd99dc85 PA |
342 | /* The read/write ends of the pipe registered as waitable file in the |
343 | event loop. */ | |
344 | static int linux_event_pipe[2] = { -1, -1 }; | |
345 | ||
346 | /* True if we're currently in async mode. */ | |
347 | #define target_is_async_p() (linux_event_pipe[0] != -1) | |
348 | ||
02fc4de7 | 349 | static void send_sigstop (struct lwp_info *lwp); |
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 | ||
fd000fb3 TBA |
405 | void |
406 | linux_process_target::delete_lwp (lwp_info *lwp) | |
bd99dc85 | 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); | |
466eecee | 414 | |
fd000fb3 | 415 | low_delete_thread (lwp->arch_private); |
466eecee | 416 | |
bd99dc85 PA |
417 | free (lwp); |
418 | } | |
419 | ||
fd000fb3 TBA |
420 | void |
421 | linux_process_target::low_delete_thread (arch_lwp_info *info) | |
422 | { | |
423 | /* Default implementation should be overridden if architecture-specific | |
424 | info is being used. */ | |
425 | gdb_assert (info == nullptr); | |
426 | } | |
95954743 | 427 | |
fd000fb3 TBA |
428 | process_info * |
429 | linux_process_target::add_linux_process (int pid, int attached) | |
95954743 PA |
430 | { |
431 | struct process_info *proc; | |
432 | ||
95954743 | 433 | proc = add_process (pid, attached); |
8d749320 | 434 | proc->priv = XCNEW (struct process_info_private); |
95954743 | 435 | |
fd000fb3 | 436 | proc->priv->arch_private = low_new_process (); |
aa5ca48f | 437 | |
95954743 PA |
438 | return proc; |
439 | } | |
440 | ||
fd000fb3 TBA |
441 | arch_process_info * |
442 | linux_process_target::low_new_process () | |
443 | { | |
444 | return nullptr; | |
445 | } | |
446 | ||
447 | void | |
448 | linux_process_target::low_delete_process (arch_process_info *info) | |
449 | { | |
450 | /* Default implementation must be overridden if architecture-specific | |
451 | info exists. */ | |
452 | gdb_assert (info == nullptr); | |
453 | } | |
454 | ||
455 | void | |
456 | linux_process_target::low_new_fork (process_info *parent, process_info *child) | |
457 | { | |
458 | /* Nop. */ | |
459 | } | |
460 | ||
797bcff5 TBA |
461 | void |
462 | linux_process_target::arch_setup_thread (thread_info *thread) | |
94585166 DB |
463 | { |
464 | struct thread_info *saved_thread; | |
465 | ||
466 | saved_thread = current_thread; | |
467 | current_thread = thread; | |
468 | ||
797bcff5 | 469 | low_arch_setup (); |
94585166 DB |
470 | |
471 | current_thread = saved_thread; | |
472 | } | |
473 | ||
d16f3f6c TBA |
474 | int |
475 | linux_process_target::handle_extended_wait (lwp_info **orig_event_lwp, | |
476 | int wstat) | |
24a09b5f | 477 | { |
c12a5089 | 478 | client_state &cs = get_client_state (); |
94585166 | 479 | struct lwp_info *event_lwp = *orig_event_lwp; |
89a5711c | 480 | int event = linux_ptrace_get_extended_event (wstat); |
de0d863e | 481 | struct thread_info *event_thr = get_lwp_thread (event_lwp); |
54a0b537 | 482 | struct lwp_info *new_lwp; |
24a09b5f | 483 | |
65706a29 PA |
484 | gdb_assert (event_lwp->waitstatus.kind == TARGET_WAITKIND_IGNORE); |
485 | ||
82075af2 JS |
486 | /* All extended events we currently use are mid-syscall. Only |
487 | PTRACE_EVENT_STOP is delivered more like a signal-stop, but | |
488 | you have to be using PTRACE_SEIZE to get that. */ | |
489 | event_lwp->syscall_state = TARGET_WAITKIND_SYSCALL_ENTRY; | |
490 | ||
c269dbdb DB |
491 | if ((event == PTRACE_EVENT_FORK) || (event == PTRACE_EVENT_VFORK) |
492 | || (event == PTRACE_EVENT_CLONE)) | |
24a09b5f | 493 | { |
95954743 | 494 | ptid_t ptid; |
24a09b5f | 495 | unsigned long new_pid; |
05044653 | 496 | int ret, status; |
24a09b5f | 497 | |
de0d863e | 498 | /* Get the pid of the new lwp. */ |
d86d4aaf | 499 | ptrace (PTRACE_GETEVENTMSG, lwpid_of (event_thr), (PTRACE_TYPE_ARG3) 0, |
56f7af9c | 500 | &new_pid); |
24a09b5f DJ |
501 | |
502 | /* If we haven't already seen the new PID stop, wait for it now. */ | |
05044653 | 503 | if (!pull_pid_from_list (&stopped_pids, new_pid, &status)) |
24a09b5f DJ |
504 | { |
505 | /* The new child has a pending SIGSTOP. We can't affect it until it | |
506 | hits the SIGSTOP, but we're already attached. */ | |
507 | ||
97438e3f | 508 | ret = my_waitpid (new_pid, &status, __WALL); |
24a09b5f DJ |
509 | |
510 | if (ret == -1) | |
511 | perror_with_name ("waiting for new child"); | |
512 | else if (ret != new_pid) | |
513 | warning ("wait returned unexpected PID %d", ret); | |
da5898ce | 514 | else if (!WIFSTOPPED (status)) |
24a09b5f DJ |
515 | warning ("wait returned unexpected status 0x%x", status); |
516 | } | |
517 | ||
c269dbdb | 518 | if (event == PTRACE_EVENT_FORK || event == PTRACE_EVENT_VFORK) |
de0d863e DB |
519 | { |
520 | struct process_info *parent_proc; | |
521 | struct process_info *child_proc; | |
522 | struct lwp_info *child_lwp; | |
bfacd19d | 523 | struct thread_info *child_thr; |
de0d863e DB |
524 | struct target_desc *tdesc; |
525 | ||
fd79271b | 526 | ptid = ptid_t (new_pid, new_pid, 0); |
de0d863e DB |
527 | |
528 | if (debug_threads) | |
529 | { | |
530 | debug_printf ("HEW: Got fork event from LWP %ld, " | |
531 | "new child is %d\n", | |
e38504b3 | 532 | ptid_of (event_thr).lwp (), |
e99b03dc | 533 | ptid.pid ()); |
de0d863e DB |
534 | } |
535 | ||
536 | /* Add the new process to the tables and clone the breakpoint | |
537 | lists of the parent. We need to do this even if the new process | |
538 | will be detached, since we will need the process object and the | |
539 | breakpoints to remove any breakpoints from memory when we | |
540 | detach, and the client side will access registers. */ | |
fd000fb3 | 541 | child_proc = add_linux_process (new_pid, 0); |
de0d863e DB |
542 | gdb_assert (child_proc != NULL); |
543 | child_lwp = add_lwp (ptid); | |
544 | gdb_assert (child_lwp != NULL); | |
545 | child_lwp->stopped = 1; | |
bfacd19d DB |
546 | child_lwp->must_set_ptrace_flags = 1; |
547 | child_lwp->status_pending_p = 0; | |
548 | child_thr = get_lwp_thread (child_lwp); | |
549 | child_thr->last_resume_kind = resume_stop; | |
998d452a PA |
550 | child_thr->last_status.kind = TARGET_WAITKIND_STOPPED; |
551 | ||
863d01bd | 552 | /* If we're suspending all threads, leave this one suspended |
0f8288ae YQ |
553 | too. If the fork/clone parent is stepping over a breakpoint, |
554 | all other threads have been suspended already. Leave the | |
555 | child suspended too. */ | |
556 | if (stopping_threads == STOPPING_AND_SUSPENDING_THREADS | |
557 | || event_lwp->bp_reinsert != 0) | |
863d01bd PA |
558 | { |
559 | if (debug_threads) | |
560 | debug_printf ("HEW: leaving child suspended\n"); | |
561 | child_lwp->suspended = 1; | |
562 | } | |
563 | ||
de0d863e DB |
564 | parent_proc = get_thread_process (event_thr); |
565 | child_proc->attached = parent_proc->attached; | |
2e7b624b YQ |
566 | |
567 | if (event_lwp->bp_reinsert != 0 | |
7582c77c | 568 | && supports_software_single_step () |
2e7b624b YQ |
569 | && event == PTRACE_EVENT_VFORK) |
570 | { | |
3b9a79ef YQ |
571 | /* If we leave single-step breakpoints there, child will |
572 | hit it, so uninsert single-step breakpoints from parent | |
2e7b624b YQ |
573 | (and child). Once vfork child is done, reinsert |
574 | them back to parent. */ | |
3b9a79ef | 575 | uninsert_single_step_breakpoints (event_thr); |
2e7b624b YQ |
576 | } |
577 | ||
63c40ec7 | 578 | clone_all_breakpoints (child_thr, event_thr); |
de0d863e | 579 | |
cc397f3a | 580 | tdesc = allocate_target_description (); |
de0d863e DB |
581 | copy_target_description (tdesc, parent_proc->tdesc); |
582 | child_proc->tdesc = tdesc; | |
de0d863e | 583 | |
3a8a0396 | 584 | /* Clone arch-specific process data. */ |
fd000fb3 | 585 | low_new_fork (parent_proc, child_proc); |
3a8a0396 | 586 | |
de0d863e | 587 | /* Save fork info in the parent thread. */ |
c269dbdb DB |
588 | if (event == PTRACE_EVENT_FORK) |
589 | event_lwp->waitstatus.kind = TARGET_WAITKIND_FORKED; | |
590 | else if (event == PTRACE_EVENT_VFORK) | |
591 | event_lwp->waitstatus.kind = TARGET_WAITKIND_VFORKED; | |
592 | ||
de0d863e | 593 | event_lwp->waitstatus.value.related_pid = ptid; |
c269dbdb | 594 | |
de0d863e DB |
595 | /* The status_pending field contains bits denoting the |
596 | extended event, so when the pending event is handled, | |
597 | the handler will look at lwp->waitstatus. */ | |
598 | event_lwp->status_pending_p = 1; | |
599 | event_lwp->status_pending = wstat; | |
600 | ||
5a04c4cf PA |
601 | /* Link the threads until the parent event is passed on to |
602 | higher layers. */ | |
603 | event_lwp->fork_relative = child_lwp; | |
604 | child_lwp->fork_relative = event_lwp; | |
605 | ||
3b9a79ef YQ |
606 | /* If the parent thread is doing step-over with single-step |
607 | breakpoints, the list of single-step breakpoints are cloned | |
2e7b624b YQ |
608 | from the parent's. Remove them from the child process. |
609 | In case of vfork, we'll reinsert them back once vforked | |
610 | child is done. */ | |
8a81c5d7 | 611 | if (event_lwp->bp_reinsert != 0 |
7582c77c | 612 | && supports_software_single_step ()) |
8a81c5d7 | 613 | { |
8a81c5d7 YQ |
614 | /* The child process is forked and stopped, so it is safe |
615 | to access its memory without stopping all other threads | |
616 | from other processes. */ | |
3b9a79ef | 617 | delete_single_step_breakpoints (child_thr); |
8a81c5d7 | 618 | |
3b9a79ef YQ |
619 | gdb_assert (has_single_step_breakpoints (event_thr)); |
620 | gdb_assert (!has_single_step_breakpoints (child_thr)); | |
8a81c5d7 YQ |
621 | } |
622 | ||
de0d863e DB |
623 | /* Report the event. */ |
624 | return 0; | |
625 | } | |
626 | ||
fa96cb38 PA |
627 | if (debug_threads) |
628 | debug_printf ("HEW: Got clone event " | |
629 | "from LWP %ld, new child is LWP %ld\n", | |
630 | lwpid_of (event_thr), new_pid); | |
631 | ||
fd79271b | 632 | ptid = ptid_t (pid_of (event_thr), new_pid, 0); |
b3312d80 | 633 | new_lwp = add_lwp (ptid); |
24a09b5f | 634 | |
e27d73f6 | 635 | /* Either we're going to immediately resume the new thread |
df95181f | 636 | or leave it stopped. resume_one_lwp is a nop if it |
e27d73f6 | 637 | thinks the thread is currently running, so set this first |
df95181f | 638 | before calling resume_one_lwp. */ |
e27d73f6 DE |
639 | new_lwp->stopped = 1; |
640 | ||
0f8288ae YQ |
641 | /* If we're suspending all threads, leave this one suspended |
642 | too. If the fork/clone parent is stepping over a breakpoint, | |
643 | all other threads have been suspended already. Leave the | |
644 | child suspended too. */ | |
645 | if (stopping_threads == STOPPING_AND_SUSPENDING_THREADS | |
646 | || event_lwp->bp_reinsert != 0) | |
bde24c0a PA |
647 | new_lwp->suspended = 1; |
648 | ||
da5898ce DJ |
649 | /* Normally we will get the pending SIGSTOP. But in some cases |
650 | we might get another signal delivered to the group first. | |
f21cc1a2 | 651 | If we do get another signal, be sure not to lose it. */ |
20ba1ce6 | 652 | if (WSTOPSIG (status) != SIGSTOP) |
da5898ce | 653 | { |
54a0b537 | 654 | new_lwp->stop_expected = 1; |
20ba1ce6 PA |
655 | new_lwp->status_pending_p = 1; |
656 | new_lwp->status_pending = status; | |
da5898ce | 657 | } |
c12a5089 | 658 | else if (cs.report_thread_events) |
65706a29 PA |
659 | { |
660 | new_lwp->waitstatus.kind = TARGET_WAITKIND_THREAD_CREATED; | |
661 | new_lwp->status_pending_p = 1; | |
662 | new_lwp->status_pending = status; | |
663 | } | |
de0d863e | 664 | |
a0aad537 | 665 | #ifdef USE_THREAD_DB |
94c207e0 | 666 | thread_db_notice_clone (event_thr, ptid); |
a0aad537 | 667 | #endif |
86299109 | 668 | |
de0d863e DB |
669 | /* Don't report the event. */ |
670 | return 1; | |
24a09b5f | 671 | } |
c269dbdb DB |
672 | else if (event == PTRACE_EVENT_VFORK_DONE) |
673 | { | |
674 | event_lwp->waitstatus.kind = TARGET_WAITKIND_VFORK_DONE; | |
675 | ||
7582c77c | 676 | if (event_lwp->bp_reinsert != 0 && supports_software_single_step ()) |
2e7b624b | 677 | { |
3b9a79ef | 678 | reinsert_single_step_breakpoints (event_thr); |
2e7b624b | 679 | |
3b9a79ef | 680 | gdb_assert (has_single_step_breakpoints (event_thr)); |
2e7b624b YQ |
681 | } |
682 | ||
c269dbdb DB |
683 | /* Report the event. */ |
684 | return 0; | |
685 | } | |
c12a5089 | 686 | else if (event == PTRACE_EVENT_EXEC && cs.report_exec_events) |
94585166 DB |
687 | { |
688 | struct process_info *proc; | |
f27866ba | 689 | std::vector<int> syscalls_to_catch; |
94585166 DB |
690 | ptid_t event_ptid; |
691 | pid_t event_pid; | |
692 | ||
693 | if (debug_threads) | |
694 | { | |
695 | debug_printf ("HEW: Got exec event from LWP %ld\n", | |
696 | lwpid_of (event_thr)); | |
697 | } | |
698 | ||
699 | /* Get the event ptid. */ | |
700 | event_ptid = ptid_of (event_thr); | |
e99b03dc | 701 | event_pid = event_ptid.pid (); |
94585166 | 702 | |
82075af2 | 703 | /* Save the syscall list from the execing process. */ |
94585166 | 704 | proc = get_thread_process (event_thr); |
f27866ba | 705 | syscalls_to_catch = std::move (proc->syscalls_to_catch); |
82075af2 JS |
706 | |
707 | /* Delete the execing process and all its threads. */ | |
d16f3f6c | 708 | mourn (proc); |
94585166 DB |
709 | current_thread = NULL; |
710 | ||
711 | /* Create a new process/lwp/thread. */ | |
fd000fb3 | 712 | proc = add_linux_process (event_pid, 0); |
94585166 DB |
713 | event_lwp = add_lwp (event_ptid); |
714 | event_thr = get_lwp_thread (event_lwp); | |
715 | gdb_assert (current_thread == event_thr); | |
797bcff5 | 716 | arch_setup_thread (event_thr); |
94585166 DB |
717 | |
718 | /* Set the event status. */ | |
719 | event_lwp->waitstatus.kind = TARGET_WAITKIND_EXECD; | |
720 | event_lwp->waitstatus.value.execd_pathname | |
721 | = xstrdup (linux_proc_pid_to_exec_file (lwpid_of (event_thr))); | |
722 | ||
723 | /* Mark the exec status as pending. */ | |
724 | event_lwp->stopped = 1; | |
725 | event_lwp->status_pending_p = 1; | |
726 | event_lwp->status_pending = wstat; | |
727 | event_thr->last_resume_kind = resume_continue; | |
728 | event_thr->last_status.kind = TARGET_WAITKIND_IGNORE; | |
729 | ||
82075af2 JS |
730 | /* Update syscall state in the new lwp, effectively mid-syscall too. */ |
731 | event_lwp->syscall_state = TARGET_WAITKIND_SYSCALL_ENTRY; | |
732 | ||
733 | /* Restore the list to catch. Don't rely on the client, which is free | |
734 | to avoid sending a new list when the architecture doesn't change. | |
735 | Also, for ANY_SYSCALL, the architecture doesn't really matter. */ | |
f27866ba | 736 | proc->syscalls_to_catch = std::move (syscalls_to_catch); |
82075af2 | 737 | |
94585166 DB |
738 | /* Report the event. */ |
739 | *orig_event_lwp = event_lwp; | |
740 | return 0; | |
741 | } | |
de0d863e DB |
742 | |
743 | internal_error (__FILE__, __LINE__, _("unknown ptrace event %d"), event); | |
24a09b5f DJ |
744 | } |
745 | ||
df95181f TBA |
746 | CORE_ADDR |
747 | linux_process_target::get_pc (lwp_info *lwp) | |
d50171e4 | 748 | { |
0bfdf32f | 749 | struct thread_info *saved_thread; |
d50171e4 PA |
750 | struct regcache *regcache; |
751 | CORE_ADDR pc; | |
752 | ||
bf9ae9d8 | 753 | if (!low_supports_breakpoints ()) |
d50171e4 PA |
754 | return 0; |
755 | ||
0bfdf32f GB |
756 | saved_thread = current_thread; |
757 | current_thread = get_lwp_thread (lwp); | |
d50171e4 | 758 | |
0bfdf32f | 759 | regcache = get_thread_regcache (current_thread, 1); |
bf9ae9d8 | 760 | pc = low_get_pc (regcache); |
d50171e4 PA |
761 | |
762 | if (debug_threads) | |
87ce2a04 | 763 | debug_printf ("pc is 0x%lx\n", (long) pc); |
d50171e4 | 764 | |
0bfdf32f | 765 | current_thread = saved_thread; |
d50171e4 PA |
766 | return pc; |
767 | } | |
768 | ||
82075af2 | 769 | /* This function should only be called if LWP got a SYSCALL_SIGTRAP. |
4cc32bec | 770 | Fill *SYSNO with the syscall nr trapped. */ |
82075af2 JS |
771 | |
772 | static void | |
4cc32bec | 773 | get_syscall_trapinfo (struct lwp_info *lwp, int *sysno) |
82075af2 JS |
774 | { |
775 | struct thread_info *saved_thread; | |
776 | struct regcache *regcache; | |
777 | ||
778 | if (the_low_target.get_syscall_trapinfo == NULL) | |
779 | { | |
780 | /* If we cannot get the syscall trapinfo, report an unknown | |
4cc32bec | 781 | system call number. */ |
82075af2 | 782 | *sysno = UNKNOWN_SYSCALL; |
82075af2 JS |
783 | return; |
784 | } | |
785 | ||
786 | saved_thread = current_thread; | |
787 | current_thread = get_lwp_thread (lwp); | |
788 | ||
789 | regcache = get_thread_regcache (current_thread, 1); | |
4cc32bec | 790 | (*the_low_target.get_syscall_trapinfo) (regcache, sysno); |
82075af2 JS |
791 | |
792 | if (debug_threads) | |
4cc32bec | 793 | debug_printf ("get_syscall_trapinfo sysno %d\n", *sysno); |
82075af2 JS |
794 | |
795 | current_thread = saved_thread; | |
796 | } | |
797 | ||
df95181f TBA |
798 | bool |
799 | linux_process_target::save_stop_reason (lwp_info *lwp) | |
0d62e5e8 | 800 | { |
582511be PA |
801 | CORE_ADDR pc; |
802 | CORE_ADDR sw_breakpoint_pc; | |
803 | struct thread_info *saved_thread; | |
3e572f71 PA |
804 | #if USE_SIGTRAP_SIGINFO |
805 | siginfo_t siginfo; | |
806 | #endif | |
d50171e4 | 807 | |
bf9ae9d8 | 808 | if (!low_supports_breakpoints ()) |
df95181f | 809 | return false; |
0d62e5e8 | 810 | |
582511be | 811 | pc = get_pc (lwp); |
d4807ea2 | 812 | sw_breakpoint_pc = pc - low_decr_pc_after_break (); |
d50171e4 | 813 | |
582511be PA |
814 | /* breakpoint_at reads from the current thread. */ |
815 | saved_thread = current_thread; | |
816 | current_thread = get_lwp_thread (lwp); | |
47c0c975 | 817 | |
3e572f71 PA |
818 | #if USE_SIGTRAP_SIGINFO |
819 | if (ptrace (PTRACE_GETSIGINFO, lwpid_of (current_thread), | |
820 | (PTRACE_TYPE_ARG3) 0, &siginfo) == 0) | |
821 | { | |
822 | if (siginfo.si_signo == SIGTRAP) | |
823 | { | |
e7ad2f14 PA |
824 | if (GDB_ARCH_IS_TRAP_BRKPT (siginfo.si_code) |
825 | && GDB_ARCH_IS_TRAP_HWBKPT (siginfo.si_code)) | |
3e572f71 | 826 | { |
e7ad2f14 PA |
827 | /* The si_code is ambiguous on this arch -- check debug |
828 | registers. */ | |
829 | if (!check_stopped_by_watchpoint (lwp)) | |
830 | lwp->stop_reason = TARGET_STOPPED_BY_SW_BREAKPOINT; | |
831 | } | |
832 | else if (GDB_ARCH_IS_TRAP_BRKPT (siginfo.si_code)) | |
833 | { | |
834 | /* If we determine the LWP stopped for a SW breakpoint, | |
835 | trust it. Particularly don't check watchpoint | |
836 | registers, because at least on s390, we'd find | |
837 | stopped-by-watchpoint as long as there's a watchpoint | |
838 | set. */ | |
3e572f71 | 839 | lwp->stop_reason = TARGET_STOPPED_BY_SW_BREAKPOINT; |
3e572f71 | 840 | } |
e7ad2f14 | 841 | else if (GDB_ARCH_IS_TRAP_HWBKPT (siginfo.si_code)) |
3e572f71 | 842 | { |
e7ad2f14 PA |
843 | /* This can indicate either a hardware breakpoint or |
844 | hardware watchpoint. Check debug registers. */ | |
845 | if (!check_stopped_by_watchpoint (lwp)) | |
846 | lwp->stop_reason = TARGET_STOPPED_BY_HW_BREAKPOINT; | |
3e572f71 | 847 | } |
2bf6fb9d PA |
848 | else if (siginfo.si_code == TRAP_TRACE) |
849 | { | |
e7ad2f14 PA |
850 | /* We may have single stepped an instruction that |
851 | triggered a watchpoint. In that case, on some | |
852 | architectures (such as x86), instead of TRAP_HWBKPT, | |
853 | si_code indicates TRAP_TRACE, and we need to check | |
854 | the debug registers separately. */ | |
855 | if (!check_stopped_by_watchpoint (lwp)) | |
856 | lwp->stop_reason = TARGET_STOPPED_BY_SINGLE_STEP; | |
2bf6fb9d | 857 | } |
3e572f71 PA |
858 | } |
859 | } | |
860 | #else | |
582511be PA |
861 | /* We may have just stepped a breakpoint instruction. E.g., in |
862 | non-stop mode, GDB first tells the thread A to step a range, and | |
863 | then the user inserts a breakpoint inside the range. In that | |
8090aef2 PA |
864 | case we need to report the breakpoint PC. */ |
865 | if ((!lwp->stepping || lwp->stop_pc == sw_breakpoint_pc) | |
d7146cda | 866 | && low_breakpoint_at (sw_breakpoint_pc)) |
e7ad2f14 PA |
867 | lwp->stop_reason = TARGET_STOPPED_BY_SW_BREAKPOINT; |
868 | ||
869 | if (hardware_breakpoint_inserted_here (pc)) | |
870 | lwp->stop_reason = TARGET_STOPPED_BY_HW_BREAKPOINT; | |
871 | ||
872 | if (lwp->stop_reason == TARGET_STOPPED_BY_NO_REASON) | |
873 | check_stopped_by_watchpoint (lwp); | |
874 | #endif | |
875 | ||
876 | if (lwp->stop_reason == TARGET_STOPPED_BY_SW_BREAKPOINT) | |
582511be PA |
877 | { |
878 | if (debug_threads) | |
879 | { | |
880 | struct thread_info *thr = get_lwp_thread (lwp); | |
881 | ||
882 | debug_printf ("CSBB: %s stopped by software breakpoint\n", | |
883 | target_pid_to_str (ptid_of (thr))); | |
884 | } | |
885 | ||
886 | /* Back up the PC if necessary. */ | |
887 | if (pc != sw_breakpoint_pc) | |
e7ad2f14 | 888 | { |
582511be PA |
889 | struct regcache *regcache |
890 | = get_thread_regcache (current_thread, 1); | |
bf9ae9d8 | 891 | low_set_pc (regcache, sw_breakpoint_pc); |
582511be PA |
892 | } |
893 | ||
e7ad2f14 PA |
894 | /* Update this so we record the correct stop PC below. */ |
895 | pc = sw_breakpoint_pc; | |
582511be | 896 | } |
e7ad2f14 | 897 | else if (lwp->stop_reason == TARGET_STOPPED_BY_HW_BREAKPOINT) |
582511be PA |
898 | { |
899 | if (debug_threads) | |
900 | { | |
901 | struct thread_info *thr = get_lwp_thread (lwp); | |
902 | ||
903 | debug_printf ("CSBB: %s stopped by hardware breakpoint\n", | |
904 | target_pid_to_str (ptid_of (thr))); | |
905 | } | |
e7ad2f14 PA |
906 | } |
907 | else if (lwp->stop_reason == TARGET_STOPPED_BY_WATCHPOINT) | |
908 | { | |
909 | if (debug_threads) | |
910 | { | |
911 | struct thread_info *thr = get_lwp_thread (lwp); | |
47c0c975 | 912 | |
e7ad2f14 PA |
913 | debug_printf ("CSBB: %s stopped by hardware watchpoint\n", |
914 | target_pid_to_str (ptid_of (thr))); | |
915 | } | |
582511be | 916 | } |
e7ad2f14 PA |
917 | else if (lwp->stop_reason == TARGET_STOPPED_BY_SINGLE_STEP) |
918 | { | |
919 | if (debug_threads) | |
920 | { | |
921 | struct thread_info *thr = get_lwp_thread (lwp); | |
582511be | 922 | |
e7ad2f14 PA |
923 | debug_printf ("CSBB: %s stopped by trace\n", |
924 | target_pid_to_str (ptid_of (thr))); | |
925 | } | |
926 | } | |
927 | ||
928 | lwp->stop_pc = pc; | |
582511be | 929 | current_thread = saved_thread; |
df95181f | 930 | return true; |
0d62e5e8 | 931 | } |
ce3a066d | 932 | |
fd000fb3 TBA |
933 | lwp_info * |
934 | linux_process_target::add_lwp (ptid_t ptid) | |
611cb4a5 | 935 | { |
54a0b537 | 936 | struct lwp_info *lwp; |
0d62e5e8 | 937 | |
8d749320 | 938 | lwp = XCNEW (struct lwp_info); |
00db26fa PA |
939 | |
940 | lwp->waitstatus.kind = TARGET_WAITKIND_IGNORE; | |
0d62e5e8 | 941 | |
754e3168 AH |
942 | lwp->thread = add_thread (ptid, lwp); |
943 | ||
fd000fb3 | 944 | low_new_thread (lwp); |
aa5ca48f | 945 | |
54a0b537 | 946 | return lwp; |
0d62e5e8 | 947 | } |
611cb4a5 | 948 | |
fd000fb3 TBA |
949 | void |
950 | linux_process_target::low_new_thread (lwp_info *info) | |
951 | { | |
952 | /* Nop. */ | |
953 | } | |
954 | ||
2090129c SDJ |
955 | /* Callback to be used when calling fork_inferior, responsible for |
956 | actually initiating the tracing of the inferior. */ | |
957 | ||
958 | static void | |
959 | linux_ptrace_fun () | |
960 | { | |
961 | if (ptrace (PTRACE_TRACEME, 0, (PTRACE_TYPE_ARG3) 0, | |
962 | (PTRACE_TYPE_ARG4) 0) < 0) | |
50fa3001 | 963 | trace_start_error_with_name ("ptrace"); |
2090129c SDJ |
964 | |
965 | if (setpgid (0, 0) < 0) | |
966 | trace_start_error_with_name ("setpgid"); | |
967 | ||
968 | /* If GDBserver is connected to gdb via stdio, redirect the inferior's | |
969 | stdout to stderr so that inferior i/o doesn't corrupt the connection. | |
970 | Also, redirect stdin to /dev/null. */ | |
971 | if (remote_connection_is_stdio ()) | |
972 | { | |
973 | if (close (0) < 0) | |
974 | trace_start_error_with_name ("close"); | |
975 | if (open ("/dev/null", O_RDONLY) < 0) | |
976 | trace_start_error_with_name ("open"); | |
977 | if (dup2 (2, 1) < 0) | |
978 | trace_start_error_with_name ("dup2"); | |
979 | if (write (2, "stdin/stdout redirected\n", | |
980 | sizeof ("stdin/stdout redirected\n") - 1) < 0) | |
981 | { | |
982 | /* Errors ignored. */; | |
983 | } | |
984 | } | |
985 | } | |
986 | ||
da6d8c04 | 987 | /* Start an inferior process and returns its pid. |
2090129c SDJ |
988 | PROGRAM is the name of the program to be started, and PROGRAM_ARGS |
989 | are its arguments. */ | |
da6d8c04 | 990 | |
15295543 TBA |
991 | int |
992 | linux_process_target::create_inferior (const char *program, | |
993 | const std::vector<char *> &program_args) | |
da6d8c04 | 994 | { |
c12a5089 | 995 | client_state &cs = get_client_state (); |
a6dbe5df | 996 | struct lwp_info *new_lwp; |
da6d8c04 | 997 | int pid; |
95954743 | 998 | ptid_t ptid; |
03583c20 | 999 | |
41272101 TT |
1000 | { |
1001 | maybe_disable_address_space_randomization restore_personality | |
c12a5089 | 1002 | (cs.disable_randomization); |
41272101 TT |
1003 | std::string str_program_args = stringify_argv (program_args); |
1004 | ||
1005 | pid = fork_inferior (program, | |
1006 | str_program_args.c_str (), | |
1007 | get_environ ()->envp (), linux_ptrace_fun, | |
1008 | NULL, NULL, NULL, NULL); | |
1009 | } | |
03583c20 | 1010 | |
fd000fb3 | 1011 | add_linux_process (pid, 0); |
95954743 | 1012 | |
fd79271b | 1013 | ptid = ptid_t (pid, pid, 0); |
95954743 | 1014 | new_lwp = add_lwp (ptid); |
a6dbe5df | 1015 | new_lwp->must_set_ptrace_flags = 1; |
611cb4a5 | 1016 | |
2090129c SDJ |
1017 | post_fork_inferior (pid, program); |
1018 | ||
a9fa9f7d | 1019 | return pid; |
da6d8c04 DJ |
1020 | } |
1021 | ||
ece66d65 JS |
1022 | /* Implement the post_create_inferior target_ops method. */ |
1023 | ||
6dee9afb TBA |
1024 | void |
1025 | linux_process_target::post_create_inferior () | |
ece66d65 JS |
1026 | { |
1027 | struct lwp_info *lwp = get_thread_lwp (current_thread); | |
1028 | ||
797bcff5 | 1029 | low_arch_setup (); |
ece66d65 JS |
1030 | |
1031 | if (lwp->must_set_ptrace_flags) | |
1032 | { | |
1033 | struct process_info *proc = current_process (); | |
1034 | int options = linux_low_ptrace_options (proc->attached); | |
1035 | ||
1036 | linux_enable_event_reporting (lwpid_of (current_thread), options); | |
1037 | lwp->must_set_ptrace_flags = 0; | |
1038 | } | |
1039 | } | |
1040 | ||
7ae1a6a6 | 1041 | int |
fd000fb3 | 1042 | linux_process_target::attach_lwp (ptid_t ptid) |
da6d8c04 | 1043 | { |
54a0b537 | 1044 | struct lwp_info *new_lwp; |
e38504b3 | 1045 | int lwpid = ptid.lwp (); |
611cb4a5 | 1046 | |
b8e1b30e | 1047 | if (ptrace (PTRACE_ATTACH, lwpid, (PTRACE_TYPE_ARG3) 0, (PTRACE_TYPE_ARG4) 0) |
56f7af9c | 1048 | != 0) |
7ae1a6a6 | 1049 | return errno; |
24a09b5f | 1050 | |
b3312d80 | 1051 | new_lwp = add_lwp (ptid); |
0d62e5e8 | 1052 | |
a6dbe5df PA |
1053 | /* We need to wait for SIGSTOP before being able to make the next |
1054 | ptrace call on this LWP. */ | |
1055 | new_lwp->must_set_ptrace_flags = 1; | |
1056 | ||
644cebc9 | 1057 | if (linux_proc_pid_is_stopped (lwpid)) |
c14d7ab2 PA |
1058 | { |
1059 | if (debug_threads) | |
87ce2a04 | 1060 | debug_printf ("Attached to a stopped process\n"); |
c14d7ab2 PA |
1061 | |
1062 | /* The process is definitely stopped. It is in a job control | |
1063 | stop, unless the kernel predates the TASK_STOPPED / | |
1064 | TASK_TRACED distinction, in which case it might be in a | |
1065 | ptrace stop. Make sure it is in a ptrace stop; from there we | |
1066 | can kill it, signal it, et cetera. | |
1067 | ||
1068 | First make sure there is a pending SIGSTOP. Since we are | |
1069 | already attached, the process can not transition from stopped | |
1070 | to running without a PTRACE_CONT; so we know this signal will | |
1071 | go into the queue. The SIGSTOP generated by PTRACE_ATTACH is | |
1072 | probably already in the queue (unless this kernel is old | |
1073 | enough to use TASK_STOPPED for ptrace stops); but since | |
1074 | SIGSTOP is not an RT signal, it can only be queued once. */ | |
1075 | kill_lwp (lwpid, SIGSTOP); | |
1076 | ||
1077 | /* Finally, resume the stopped process. This will deliver the | |
1078 | SIGSTOP (or a higher priority signal, just like normal | |
1079 | PTRACE_ATTACH), which we'll catch later on. */ | |
b8e1b30e | 1080 | ptrace (PTRACE_CONT, lwpid, (PTRACE_TYPE_ARG3) 0, (PTRACE_TYPE_ARG4) 0); |
c14d7ab2 PA |
1081 | } |
1082 | ||
0d62e5e8 | 1083 | /* The next time we wait for this LWP we'll see a SIGSTOP as PTRACE_ATTACH |
0e21c1ec DE |
1084 | brings it to a halt. |
1085 | ||
1086 | There are several cases to consider here: | |
1087 | ||
1088 | 1) gdbserver has already attached to the process and is being notified | |
1b3f6016 | 1089 | of a new thread that is being created. |
d50171e4 PA |
1090 | In this case we should ignore that SIGSTOP and resume the |
1091 | process. This is handled below by setting stop_expected = 1, | |
8336d594 | 1092 | and the fact that add_thread sets last_resume_kind == |
d50171e4 | 1093 | resume_continue. |
0e21c1ec DE |
1094 | |
1095 | 2) This is the first thread (the process thread), and we're attaching | |
1b3f6016 PA |
1096 | to it via attach_inferior. |
1097 | In this case we want the process thread to stop. | |
d50171e4 PA |
1098 | This is handled by having linux_attach set last_resume_kind == |
1099 | resume_stop after we return. | |
e3deef73 LM |
1100 | |
1101 | If the pid we are attaching to is also the tgid, we attach to and | |
1102 | stop all the existing threads. Otherwise, we attach to pid and | |
1103 | ignore any other threads in the same group as this pid. | |
0e21c1ec DE |
1104 | |
1105 | 3) GDB is connecting to gdbserver and is requesting an enumeration of all | |
1b3f6016 PA |
1106 | existing threads. |
1107 | In this case we want the thread to stop. | |
1108 | FIXME: This case is currently not properly handled. | |
1109 | We should wait for the SIGSTOP but don't. Things work apparently | |
1110 | because enough time passes between when we ptrace (ATTACH) and when | |
1111 | gdb makes the next ptrace call on the thread. | |
0d62e5e8 DJ |
1112 | |
1113 | On the other hand, if we are currently trying to stop all threads, we | |
1114 | should treat the new thread as if we had sent it a SIGSTOP. This works | |
54a0b537 | 1115 | because we are guaranteed that the add_lwp call above added us to the |
0e21c1ec DE |
1116 | end of the list, and so the new thread has not yet reached |
1117 | wait_for_sigstop (but will). */ | |
d50171e4 | 1118 | new_lwp->stop_expected = 1; |
0d62e5e8 | 1119 | |
7ae1a6a6 | 1120 | return 0; |
95954743 PA |
1121 | } |
1122 | ||
8784d563 PA |
1123 | /* Callback for linux_proc_attach_tgid_threads. Attach to PTID if not |
1124 | already attached. Returns true if a new LWP is found, false | |
1125 | otherwise. */ | |
1126 | ||
1127 | static int | |
1128 | attach_proc_task_lwp_callback (ptid_t ptid) | |
1129 | { | |
1130 | /* Is this a new thread? */ | |
1131 | if (find_thread_ptid (ptid) == NULL) | |
1132 | { | |
e38504b3 | 1133 | int lwpid = ptid.lwp (); |
8784d563 PA |
1134 | int err; |
1135 | ||
1136 | if (debug_threads) | |
1137 | debug_printf ("Found new lwp %d\n", lwpid); | |
1138 | ||
fd000fb3 | 1139 | err = the_linux_target->attach_lwp (ptid); |
8784d563 PA |
1140 | |
1141 | /* Be quiet if we simply raced with the thread exiting. EPERM | |
1142 | is returned if the thread's task still exists, and is marked | |
1143 | as exited or zombie, as well as other conditions, so in that | |
1144 | case, confirm the status in /proc/PID/status. */ | |
1145 | if (err == ESRCH | |
1146 | || (err == EPERM && linux_proc_pid_is_gone (lwpid))) | |
1147 | { | |
1148 | if (debug_threads) | |
1149 | { | |
1150 | debug_printf ("Cannot attach to lwp %d: " | |
1151 | "thread is gone (%d: %s)\n", | |
6d91ce9a | 1152 | lwpid, err, safe_strerror (err)); |
8784d563 PA |
1153 | } |
1154 | } | |
1155 | else if (err != 0) | |
1156 | { | |
4d9b86e1 | 1157 | std::string reason |
50fa3001 | 1158 | = linux_ptrace_attach_fail_reason_string (ptid, err); |
4d9b86e1 SM |
1159 | |
1160 | warning (_("Cannot attach to lwp %d: %s"), lwpid, reason.c_str ()); | |
8784d563 PA |
1161 | } |
1162 | ||
1163 | return 1; | |
1164 | } | |
1165 | return 0; | |
1166 | } | |
1167 | ||
500c1d85 PA |
1168 | static void async_file_mark (void); |
1169 | ||
e3deef73 LM |
1170 | /* Attach to PID. If PID is the tgid, attach to it and all |
1171 | of its threads. */ | |
1172 | ||
ef03dad8 TBA |
1173 | int |
1174 | linux_process_target::attach (unsigned long pid) | |
0d62e5e8 | 1175 | { |
500c1d85 PA |
1176 | struct process_info *proc; |
1177 | struct thread_info *initial_thread; | |
fd79271b | 1178 | ptid_t ptid = ptid_t (pid, pid, 0); |
7ae1a6a6 PA |
1179 | int err; |
1180 | ||
fd000fb3 | 1181 | proc = add_linux_process (pid, 1); |
df0da8a2 | 1182 | |
e3deef73 LM |
1183 | /* Attach to PID. We will check for other threads |
1184 | soon. */ | |
fd000fb3 | 1185 | err = attach_lwp (ptid); |
7ae1a6a6 | 1186 | if (err != 0) |
4d9b86e1 | 1187 | { |
df0da8a2 | 1188 | remove_process (proc); |
4d9b86e1 | 1189 | |
50fa3001 SDJ |
1190 | std::string reason = linux_ptrace_attach_fail_reason_string (ptid, err); |
1191 | error ("Cannot attach to process %ld: %s", pid, reason.c_str ()); | |
4d9b86e1 | 1192 | } |
7ae1a6a6 | 1193 | |
500c1d85 PA |
1194 | /* Don't ignore the initial SIGSTOP if we just attached to this |
1195 | process. It will be collected by wait shortly. */ | |
fd79271b | 1196 | initial_thread = find_thread_ptid (ptid_t (pid, pid, 0)); |
500c1d85 | 1197 | initial_thread->last_resume_kind = resume_stop; |
0d62e5e8 | 1198 | |
8784d563 PA |
1199 | /* We must attach to every LWP. If /proc is mounted, use that to |
1200 | find them now. On the one hand, the inferior may be using raw | |
1201 | clone instead of using pthreads. On the other hand, even if it | |
1202 | is using pthreads, GDB may not be connected yet (thread_db needs | |
1203 | to do symbol lookups, through qSymbol). Also, thread_db walks | |
1204 | structures in the inferior's address space to find the list of | |
1205 | threads/LWPs, and those structures may well be corrupted. Note | |
1206 | that once thread_db is loaded, we'll still use it to list threads | |
1207 | and associate pthread info with each LWP. */ | |
1208 | linux_proc_attach_tgid_threads (pid, attach_proc_task_lwp_callback); | |
500c1d85 PA |
1209 | |
1210 | /* GDB will shortly read the xml target description for this | |
1211 | process, to figure out the process' architecture. But the target | |
1212 | description is only filled in when the first process/thread in | |
1213 | the thread group reports its initial PTRACE_ATTACH SIGSTOP. Do | |
1214 | that now, otherwise, if GDB is fast enough, it could read the | |
1215 | target description _before_ that initial stop. */ | |
1216 | if (non_stop) | |
1217 | { | |
1218 | struct lwp_info *lwp; | |
1219 | int wstat, lwpid; | |
f2907e49 | 1220 | ptid_t pid_ptid = ptid_t (pid); |
500c1d85 | 1221 | |
d16f3f6c | 1222 | lwpid = wait_for_event_filtered (pid_ptid, pid_ptid, &wstat, __WALL); |
500c1d85 PA |
1223 | gdb_assert (lwpid > 0); |
1224 | ||
f2907e49 | 1225 | lwp = find_lwp_pid (ptid_t (lwpid)); |
500c1d85 PA |
1226 | |
1227 | if (!WIFSTOPPED (wstat) || WSTOPSIG (wstat) != SIGSTOP) | |
1228 | { | |
1229 | lwp->status_pending_p = 1; | |
1230 | lwp->status_pending = wstat; | |
1231 | } | |
1232 | ||
1233 | initial_thread->last_resume_kind = resume_continue; | |
1234 | ||
1235 | async_file_mark (); | |
1236 | ||
1237 | gdb_assert (proc->tdesc != NULL); | |
1238 | } | |
1239 | ||
95954743 PA |
1240 | return 0; |
1241 | } | |
1242 | ||
95954743 | 1243 | static int |
e4eb0dec | 1244 | last_thread_of_process_p (int pid) |
95954743 | 1245 | { |
e4eb0dec | 1246 | bool seen_one = false; |
95954743 | 1247 | |
da4ae14a | 1248 | thread_info *thread = find_thread (pid, [&] (thread_info *thr_arg) |
95954743 | 1249 | { |
e4eb0dec SM |
1250 | if (!seen_one) |
1251 | { | |
1252 | /* This is the first thread of this process we see. */ | |
1253 | seen_one = true; | |
1254 | return false; | |
1255 | } | |
1256 | else | |
1257 | { | |
1258 | /* This is the second thread of this process we see. */ | |
1259 | return true; | |
1260 | } | |
1261 | }); | |
da6d8c04 | 1262 | |
e4eb0dec | 1263 | return thread == NULL; |
95954743 PA |
1264 | } |
1265 | ||
da84f473 PA |
1266 | /* Kill LWP. */ |
1267 | ||
1268 | static void | |
1269 | linux_kill_one_lwp (struct lwp_info *lwp) | |
1270 | { | |
d86d4aaf DE |
1271 | struct thread_info *thr = get_lwp_thread (lwp); |
1272 | int pid = lwpid_of (thr); | |
da84f473 PA |
1273 | |
1274 | /* PTRACE_KILL is unreliable. After stepping into a signal handler, | |
1275 | there is no signal context, and ptrace(PTRACE_KILL) (or | |
1276 | ptrace(PTRACE_CONT, SIGKILL), pretty much the same) acts like | |
1277 | ptrace(CONT, pid, 0,0) and just resumes the tracee. A better | |
1278 | alternative is to kill with SIGKILL. We only need one SIGKILL | |
1279 | per process, not one for each thread. But since we still support | |
4a6ed09b PA |
1280 | support debugging programs using raw clone without CLONE_THREAD, |
1281 | we send one for each thread. For years, we used PTRACE_KILL | |
1282 | only, so we're being a bit paranoid about some old kernels where | |
1283 | PTRACE_KILL might work better (dubious if there are any such, but | |
1284 | that's why it's paranoia), so we try SIGKILL first, PTRACE_KILL | |
1285 | second, and so we're fine everywhere. */ | |
da84f473 PA |
1286 | |
1287 | errno = 0; | |
69ff6be5 | 1288 | kill_lwp (pid, SIGKILL); |
da84f473 | 1289 | if (debug_threads) |
ce9e3fe7 PA |
1290 | { |
1291 | int save_errno = errno; | |
1292 | ||
1293 | debug_printf ("LKL: kill_lwp (SIGKILL) %s, 0, 0 (%s)\n", | |
1294 | target_pid_to_str (ptid_of (thr)), | |
6d91ce9a | 1295 | save_errno ? safe_strerror (save_errno) : "OK"); |
ce9e3fe7 | 1296 | } |
da84f473 PA |
1297 | |
1298 | errno = 0; | |
b8e1b30e | 1299 | ptrace (PTRACE_KILL, pid, (PTRACE_TYPE_ARG3) 0, (PTRACE_TYPE_ARG4) 0); |
da84f473 | 1300 | if (debug_threads) |
ce9e3fe7 PA |
1301 | { |
1302 | int save_errno = errno; | |
1303 | ||
1304 | debug_printf ("LKL: PTRACE_KILL %s, 0, 0 (%s)\n", | |
1305 | target_pid_to_str (ptid_of (thr)), | |
6d91ce9a | 1306 | save_errno ? safe_strerror (save_errno) : "OK"); |
ce9e3fe7 | 1307 | } |
da84f473 PA |
1308 | } |
1309 | ||
e76126e8 PA |
1310 | /* Kill LWP and wait for it to die. */ |
1311 | ||
1312 | static void | |
1313 | kill_wait_lwp (struct lwp_info *lwp) | |
1314 | { | |
1315 | struct thread_info *thr = get_lwp_thread (lwp); | |
e99b03dc | 1316 | int pid = ptid_of (thr).pid (); |
e38504b3 | 1317 | int lwpid = ptid_of (thr).lwp (); |
e76126e8 PA |
1318 | int wstat; |
1319 | int res; | |
1320 | ||
1321 | if (debug_threads) | |
1322 | debug_printf ("kwl: killing lwp %d, for pid: %d\n", lwpid, pid); | |
1323 | ||
1324 | do | |
1325 | { | |
1326 | linux_kill_one_lwp (lwp); | |
1327 | ||
1328 | /* Make sure it died. Notes: | |
1329 | ||
1330 | - The loop is most likely unnecessary. | |
1331 | ||
d16f3f6c | 1332 | - We don't use wait_for_event as that could delete lwps |
e76126e8 PA |
1333 | while we're iterating over them. We're not interested in |
1334 | any pending status at this point, only in making sure all | |
1335 | wait status on the kernel side are collected until the | |
1336 | process is reaped. | |
1337 | ||
1338 | - We don't use __WALL here as the __WALL emulation relies on | |
1339 | SIGCHLD, and killing a stopped process doesn't generate | |
1340 | one, nor an exit status. | |
1341 | */ | |
1342 | res = my_waitpid (lwpid, &wstat, 0); | |
1343 | if (res == -1 && errno == ECHILD) | |
1344 | res = my_waitpid (lwpid, &wstat, __WCLONE); | |
1345 | } while (res > 0 && WIFSTOPPED (wstat)); | |
1346 | ||
586b02a9 PA |
1347 | /* Even if it was stopped, the child may have already disappeared. |
1348 | E.g., if it was killed by SIGKILL. */ | |
1349 | if (res < 0 && errno != ECHILD) | |
1350 | perror_with_name ("kill_wait_lwp"); | |
e76126e8 PA |
1351 | } |
1352 | ||
578290ec | 1353 | /* Callback for `for_each_thread'. Kills an lwp of a given process, |
da84f473 | 1354 | except the leader. */ |
95954743 | 1355 | |
578290ec SM |
1356 | static void |
1357 | kill_one_lwp_callback (thread_info *thread, int pid) | |
da6d8c04 | 1358 | { |
54a0b537 | 1359 | struct lwp_info *lwp = get_thread_lwp (thread); |
0d62e5e8 | 1360 | |
fd500816 DJ |
1361 | /* We avoid killing the first thread here, because of a Linux kernel (at |
1362 | least 2.6.0-test7 through 2.6.8-rc4) bug; if we kill the parent before | |
1363 | the children get a chance to be reaped, it will remain a zombie | |
1364 | forever. */ | |
95954743 | 1365 | |
d86d4aaf | 1366 | if (lwpid_of (thread) == pid) |
95954743 PA |
1367 | { |
1368 | if (debug_threads) | |
87ce2a04 | 1369 | debug_printf ("lkop: is last of process %s\n", |
9c80ecd6 | 1370 | target_pid_to_str (thread->id)); |
578290ec | 1371 | return; |
95954743 | 1372 | } |
fd500816 | 1373 | |
e76126e8 | 1374 | kill_wait_lwp (lwp); |
da6d8c04 DJ |
1375 | } |
1376 | ||
c6885a57 TBA |
1377 | int |
1378 | linux_process_target::kill (process_info *process) | |
0d62e5e8 | 1379 | { |
a780ef4f | 1380 | int pid = process->pid; |
9d606399 | 1381 | |
f9e39928 PA |
1382 | /* If we're killing a running inferior, make sure it is stopped |
1383 | first, as PTRACE_KILL will not work otherwise. */ | |
7984d532 | 1384 | stop_all_lwps (0, NULL); |
f9e39928 | 1385 | |
578290ec SM |
1386 | for_each_thread (pid, [&] (thread_info *thread) |
1387 | { | |
1388 | kill_one_lwp_callback (thread, pid); | |
1389 | }); | |
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. */ |
a780ef4f | 1393 | lwp_info *lwp = find_lwp_pid (ptid_t (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 | |
8adb37b9 | 1404 | 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 | { | |
c12a5089 | 1419 | client_state &cs = get_client_state (); |
a493e3e2 | 1420 | enum gdb_signal signo = GDB_SIGNAL_0; |
9b224c5e PA |
1421 | int status; |
1422 | struct lwp_info *lp = get_thread_lwp (thread); | |
1423 | ||
1424 | if (lp->status_pending_p) | |
1425 | status = lp->status_pending; | |
1426 | else | |
1427 | { | |
1428 | /* If the thread had been suspended by gdbserver, and it stopped | |
1429 | cleanly, then it'll have stopped with SIGSTOP. But we don't | |
1430 | want to deliver that SIGSTOP. */ | |
1431 | if (thread->last_status.kind != TARGET_WAITKIND_STOPPED | |
a493e3e2 | 1432 | || thread->last_status.value.sig == GDB_SIGNAL_0) |
9b224c5e PA |
1433 | return 0; |
1434 | ||
1435 | /* Otherwise, we may need to deliver the signal we | |
1436 | intercepted. */ | |
1437 | status = lp->last_status; | |
1438 | } | |
1439 | ||
1440 | if (!WIFSTOPPED (status)) | |
1441 | { | |
1442 | if (debug_threads) | |
87ce2a04 | 1443 | debug_printf ("GPS: lwp %s hasn't stopped: no pending signal\n", |
d86d4aaf | 1444 | target_pid_to_str (ptid_of (thread))); |
9b224c5e PA |
1445 | return 0; |
1446 | } | |
1447 | ||
1448 | /* Extended wait statuses aren't real SIGTRAPs. */ | |
89a5711c | 1449 | if (WSTOPSIG (status) == SIGTRAP && linux_is_extended_waitstatus (status)) |
9b224c5e PA |
1450 | { |
1451 | if (debug_threads) | |
87ce2a04 DE |
1452 | debug_printf ("GPS: lwp %s had stopped with extended " |
1453 | "status: no pending signal\n", | |
d86d4aaf | 1454 | target_pid_to_str (ptid_of (thread))); |
9b224c5e PA |
1455 | return 0; |
1456 | } | |
1457 | ||
2ea28649 | 1458 | signo = gdb_signal_from_host (WSTOPSIG (status)); |
9b224c5e | 1459 | |
c12a5089 | 1460 | if (cs.program_signals_p && !cs.program_signals[signo]) |
9b224c5e PA |
1461 | { |
1462 | if (debug_threads) | |
87ce2a04 | 1463 | debug_printf ("GPS: lwp %s had signal %s, but it is in nopass state\n", |
d86d4aaf | 1464 | target_pid_to_str (ptid_of (thread)), |
87ce2a04 | 1465 | gdb_signal_to_string (signo)); |
9b224c5e PA |
1466 | return 0; |
1467 | } | |
c12a5089 | 1468 | else if (!cs.program_signals_p |
9b224c5e PA |
1469 | /* If we have no way to know which signals GDB does not |
1470 | want to have passed to the program, assume | |
1471 | SIGTRAP/SIGINT, which is GDB's default. */ | |
a493e3e2 | 1472 | && (signo == GDB_SIGNAL_TRAP || signo == GDB_SIGNAL_INT)) |
9b224c5e PA |
1473 | { |
1474 | if (debug_threads) | |
87ce2a04 DE |
1475 | debug_printf ("GPS: lwp %s had signal %s, " |
1476 | "but we don't know if we should pass it. " | |
1477 | "Default to not.\n", | |
d86d4aaf | 1478 | target_pid_to_str (ptid_of (thread)), |
87ce2a04 | 1479 | gdb_signal_to_string (signo)); |
9b224c5e PA |
1480 | return 0; |
1481 | } | |
1482 | else | |
1483 | { | |
1484 | if (debug_threads) | |
87ce2a04 | 1485 | debug_printf ("GPS: lwp %s has pending signal %s: delivering it.\n", |
d86d4aaf | 1486 | target_pid_to_str (ptid_of (thread)), |
87ce2a04 | 1487 | gdb_signal_to_string (signo)); |
9b224c5e PA |
1488 | |
1489 | return WSTOPSIG (status); | |
1490 | } | |
1491 | } | |
1492 | ||
fd000fb3 TBA |
1493 | void |
1494 | linux_process_target::detach_one_lwp (lwp_info *lwp) | |
6ad8ae5c | 1495 | { |
ced2dffb | 1496 | struct thread_info *thread = get_lwp_thread (lwp); |
9b224c5e | 1497 | int sig; |
ced2dffb | 1498 | int lwpid; |
6ad8ae5c | 1499 | |
9b224c5e | 1500 | /* If there is a pending SIGSTOP, get rid of it. */ |
54a0b537 | 1501 | if (lwp->stop_expected) |
ae13219e | 1502 | { |
9b224c5e | 1503 | if (debug_threads) |
87ce2a04 | 1504 | debug_printf ("Sending SIGCONT to %s\n", |
d86d4aaf | 1505 | target_pid_to_str (ptid_of (thread))); |
9b224c5e | 1506 | |
d86d4aaf | 1507 | kill_lwp (lwpid_of (thread), SIGCONT); |
54a0b537 | 1508 | lwp->stop_expected = 0; |
ae13219e DJ |
1509 | } |
1510 | ||
9b224c5e PA |
1511 | /* Pass on any pending signal for this thread. */ |
1512 | sig = get_detach_signal (thread); | |
1513 | ||
ced2dffb PA |
1514 | /* Preparing to resume may try to write registers, and fail if the |
1515 | lwp is zombie. If that happens, ignore the error. We'll handle | |
1516 | it below, when detach fails with ESRCH. */ | |
a70b8144 | 1517 | try |
ced2dffb PA |
1518 | { |
1519 | /* Flush any pending changes to the process's registers. */ | |
1520 | regcache_invalidate_thread (thread); | |
1521 | ||
1522 | /* Finally, let it resume. */ | |
d7599cc0 | 1523 | low_prepare_to_resume (lwp); |
ced2dffb | 1524 | } |
230d2906 | 1525 | catch (const gdb_exception_error &ex) |
ced2dffb PA |
1526 | { |
1527 | if (!check_ptrace_stopped_lwp_gone (lwp)) | |
eedc3f4f | 1528 | throw; |
ced2dffb | 1529 | } |
ced2dffb PA |
1530 | |
1531 | lwpid = lwpid_of (thread); | |
1532 | if (ptrace (PTRACE_DETACH, lwpid, (PTRACE_TYPE_ARG3) 0, | |
b8e1b30e | 1533 | (PTRACE_TYPE_ARG4) (long) sig) < 0) |
ced2dffb PA |
1534 | { |
1535 | int save_errno = errno; | |
1536 | ||
1537 | /* We know the thread exists, so ESRCH must mean the lwp is | |
1538 | zombie. This can happen if one of the already-detached | |
1539 | threads exits the whole thread group. In that case we're | |
1540 | still attached, and must reap the lwp. */ | |
1541 | if (save_errno == ESRCH) | |
1542 | { | |
1543 | int ret, status; | |
1544 | ||
1545 | ret = my_waitpid (lwpid, &status, __WALL); | |
1546 | if (ret == -1) | |
1547 | { | |
1548 | warning (_("Couldn't reap LWP %d while detaching: %s"), | |
6d91ce9a | 1549 | lwpid, safe_strerror (errno)); |
ced2dffb PA |
1550 | } |
1551 | else if (!WIFEXITED (status) && !WIFSIGNALED (status)) | |
1552 | { | |
1553 | warning (_("Reaping LWP %d while detaching " | |
1554 | "returned unexpected status 0x%x"), | |
1555 | lwpid, status); | |
1556 | } | |
1557 | } | |
1558 | else | |
1559 | { | |
1560 | error (_("Can't detach %s: %s"), | |
1561 | target_pid_to_str (ptid_of (thread)), | |
6d91ce9a | 1562 | safe_strerror (save_errno)); |
ced2dffb PA |
1563 | } |
1564 | } | |
1565 | else if (debug_threads) | |
1566 | { | |
1567 | debug_printf ("PTRACE_DETACH (%s, %s, 0) (OK)\n", | |
1568 | target_pid_to_str (ptid_of (thread)), | |
1569 | strsignal (sig)); | |
1570 | } | |
bd99dc85 PA |
1571 | |
1572 | delete_lwp (lwp); | |
ced2dffb PA |
1573 | } |
1574 | ||
9061c9cf TBA |
1575 | int |
1576 | linux_process_target::detach (process_info *process) | |
95954743 | 1577 | { |
ced2dffb | 1578 | struct lwp_info *main_lwp; |
95954743 | 1579 | |
863d01bd PA |
1580 | /* As there's a step over already in progress, let it finish first, |
1581 | otherwise nesting a stabilize_threads operation on top gets real | |
1582 | messy. */ | |
1583 | complete_ongoing_step_over (); | |
1584 | ||
f9e39928 | 1585 | /* Stop all threads before detaching. First, ptrace requires that |
30baf67b | 1586 | the thread is stopped to successfully detach. Second, thread_db |
f9e39928 PA |
1587 | may need to uninstall thread event breakpoints from memory, which |
1588 | only works with a stopped process anyway. */ | |
7984d532 | 1589 | stop_all_lwps (0, NULL); |
f9e39928 | 1590 | |
ca5c370d | 1591 | #ifdef USE_THREAD_DB |
8336d594 | 1592 | thread_db_detach (process); |
ca5c370d PA |
1593 | #endif |
1594 | ||
fa593d66 | 1595 | /* Stabilize threads (move out of jump pads). */ |
5c9eb2f2 | 1596 | target_stabilize_threads (); |
fa593d66 | 1597 | |
ced2dffb PA |
1598 | /* Detach from the clone lwps first. If the thread group exits just |
1599 | while we're detaching, we must reap the clone lwps before we're | |
1600 | able to reap the leader. */ | |
fd000fb3 TBA |
1601 | for_each_thread (process->pid, [this] (thread_info *thread) |
1602 | { | |
1603 | /* We don't actually detach from the thread group leader just yet. | |
1604 | If the thread group exits, we must reap the zombie clone lwps | |
1605 | before we're able to reap the leader. */ | |
1606 | if (thread->id.pid () == thread->id.lwp ()) | |
1607 | return; | |
1608 | ||
1609 | lwp_info *lwp = get_thread_lwp (thread); | |
1610 | detach_one_lwp (lwp); | |
1611 | }); | |
ced2dffb | 1612 | |
ef2ddb33 | 1613 | main_lwp = find_lwp_pid (ptid_t (process->pid)); |
fd000fb3 | 1614 | detach_one_lwp (main_lwp); |
8336d594 | 1615 | |
8adb37b9 | 1616 | mourn (process); |
f9e39928 PA |
1617 | |
1618 | /* Since we presently can only stop all lwps of all processes, we | |
1619 | need to unstop lwps of other processes. */ | |
7984d532 | 1620 | unstop_all_lwps (0, NULL); |
f9e39928 PA |
1621 | return 0; |
1622 | } | |
1623 | ||
1624 | /* Remove all LWPs that belong to process PROC from the lwp list. */ | |
1625 | ||
8adb37b9 TBA |
1626 | void |
1627 | linux_process_target::mourn (process_info *process) | |
8336d594 PA |
1628 | { |
1629 | struct process_info_private *priv; | |
1630 | ||
1631 | #ifdef USE_THREAD_DB | |
1632 | thread_db_mourn (process); | |
1633 | #endif | |
1634 | ||
fd000fb3 | 1635 | for_each_thread (process->pid, [this] (thread_info *thread) |
6b2a85da SM |
1636 | { |
1637 | delete_lwp (get_thread_lwp (thread)); | |
1638 | }); | |
f9e39928 | 1639 | |
8336d594 | 1640 | /* Freeing all private data. */ |
fe978cb0 | 1641 | priv = process->priv; |
fd000fb3 | 1642 | low_delete_process (priv->arch_private); |
8336d594 | 1643 | free (priv); |
fe978cb0 | 1644 | process->priv = NULL; |
505106cd PA |
1645 | |
1646 | remove_process (process); | |
8336d594 PA |
1647 | } |
1648 | ||
95a49a39 TBA |
1649 | void |
1650 | linux_process_target::join (int pid) | |
444d6139 | 1651 | { |
444d6139 PA |
1652 | int status, ret; |
1653 | ||
1654 | do { | |
d105de22 | 1655 | ret = my_waitpid (pid, &status, 0); |
444d6139 PA |
1656 | if (WIFEXITED (status) || WIFSIGNALED (status)) |
1657 | break; | |
1658 | } while (ret != -1 || errno != ECHILD); | |
1659 | } | |
1660 | ||
13d3d99b TBA |
1661 | /* Return true if the given thread is still alive. */ |
1662 | ||
1663 | bool | |
1664 | linux_process_target::thread_alive (ptid_t ptid) | |
0d62e5e8 | 1665 | { |
95954743 PA |
1666 | struct lwp_info *lwp = find_lwp_pid (ptid); |
1667 | ||
1668 | /* We assume we always know if a thread exits. If a whole process | |
1669 | exited but we still haven't been able to report it to GDB, we'll | |
1670 | hold on to the last lwp of the dead process. */ | |
1671 | if (lwp != NULL) | |
00db26fa | 1672 | return !lwp_is_marked_dead (lwp); |
0d62e5e8 DJ |
1673 | else |
1674 | return 0; | |
1675 | } | |
1676 | ||
df95181f TBA |
1677 | bool |
1678 | linux_process_target::thread_still_has_status_pending (thread_info *thread) | |
582511be PA |
1679 | { |
1680 | struct lwp_info *lp = get_thread_lwp (thread); | |
1681 | ||
1682 | if (!lp->status_pending_p) | |
1683 | return 0; | |
1684 | ||
582511be | 1685 | if (thread->last_resume_kind != resume_stop |
15c66dd6 PA |
1686 | && (lp->stop_reason == TARGET_STOPPED_BY_SW_BREAKPOINT |
1687 | || lp->stop_reason == TARGET_STOPPED_BY_HW_BREAKPOINT)) | |
582511be PA |
1688 | { |
1689 | struct thread_info *saved_thread; | |
1690 | CORE_ADDR pc; | |
1691 | int discard = 0; | |
1692 | ||
1693 | gdb_assert (lp->last_status != 0); | |
1694 | ||
1695 | pc = get_pc (lp); | |
1696 | ||
1697 | saved_thread = current_thread; | |
1698 | current_thread = thread; | |
1699 | ||
1700 | if (pc != lp->stop_pc) | |
1701 | { | |
1702 | if (debug_threads) | |
1703 | debug_printf ("PC of %ld changed\n", | |
1704 | lwpid_of (thread)); | |
1705 | discard = 1; | |
1706 | } | |
3e572f71 PA |
1707 | |
1708 | #if !USE_SIGTRAP_SIGINFO | |
15c66dd6 | 1709 | else if (lp->stop_reason == TARGET_STOPPED_BY_SW_BREAKPOINT |
d7146cda | 1710 | && !low_breakpoint_at (pc)) |
582511be PA |
1711 | { |
1712 | if (debug_threads) | |
1713 | debug_printf ("previous SW breakpoint of %ld gone\n", | |
1714 | lwpid_of (thread)); | |
1715 | discard = 1; | |
1716 | } | |
15c66dd6 | 1717 | else if (lp->stop_reason == TARGET_STOPPED_BY_HW_BREAKPOINT |
582511be PA |
1718 | && !hardware_breakpoint_inserted_here (pc)) |
1719 | { | |
1720 | if (debug_threads) | |
1721 | debug_printf ("previous HW breakpoint of %ld gone\n", | |
1722 | lwpid_of (thread)); | |
1723 | discard = 1; | |
1724 | } | |
3e572f71 | 1725 | #endif |
582511be PA |
1726 | |
1727 | current_thread = saved_thread; | |
1728 | ||
1729 | if (discard) | |
1730 | { | |
1731 | if (debug_threads) | |
1732 | debug_printf ("discarding pending breakpoint status\n"); | |
1733 | lp->status_pending_p = 0; | |
1734 | return 0; | |
1735 | } | |
1736 | } | |
1737 | ||
1738 | return 1; | |
1739 | } | |
1740 | ||
a681f9c9 PA |
1741 | /* Returns true if LWP is resumed from the client's perspective. */ |
1742 | ||
1743 | static int | |
1744 | lwp_resumed (struct lwp_info *lwp) | |
1745 | { | |
1746 | struct thread_info *thread = get_lwp_thread (lwp); | |
1747 | ||
1748 | if (thread->last_resume_kind != resume_stop) | |
1749 | return 1; | |
1750 | ||
1751 | /* Did gdb send us a `vCont;t', but we haven't reported the | |
1752 | corresponding stop to gdb yet? If so, the thread is still | |
1753 | resumed/running from gdb's perspective. */ | |
1754 | if (thread->last_resume_kind == resume_stop | |
1755 | && thread->last_status.kind == TARGET_WAITKIND_IGNORE) | |
1756 | return 1; | |
1757 | ||
1758 | return 0; | |
1759 | } | |
1760 | ||
df95181f TBA |
1761 | bool |
1762 | linux_process_target::status_pending_p_callback (thread_info *thread, | |
1763 | ptid_t ptid) | |
0d62e5e8 | 1764 | { |
582511be | 1765 | struct lwp_info *lp = get_thread_lwp (thread); |
95954743 PA |
1766 | |
1767 | /* Check if we're only interested in events from a specific process | |
afa8d396 | 1768 | or a specific LWP. */ |
83e1b6c1 | 1769 | if (!thread->id.matches (ptid)) |
95954743 | 1770 | return 0; |
0d62e5e8 | 1771 | |
a681f9c9 PA |
1772 | if (!lwp_resumed (lp)) |
1773 | return 0; | |
1774 | ||
582511be | 1775 | if (lp->status_pending_p |
df95181f | 1776 | && !thread_still_has_status_pending (thread)) |
582511be | 1777 | { |
df95181f | 1778 | resume_one_lwp (lp, lp->stepping, GDB_SIGNAL_0, NULL); |
582511be PA |
1779 | return 0; |
1780 | } | |
0d62e5e8 | 1781 | |
582511be | 1782 | return lp->status_pending_p; |
0d62e5e8 DJ |
1783 | } |
1784 | ||
95954743 PA |
1785 | struct lwp_info * |
1786 | find_lwp_pid (ptid_t ptid) | |
1787 | { | |
da4ae14a | 1788 | thread_info *thread = find_thread ([&] (thread_info *thr_arg) |
454296a2 SM |
1789 | { |
1790 | int lwp = ptid.lwp () != 0 ? ptid.lwp () : ptid.pid (); | |
da4ae14a | 1791 | return thr_arg->id.lwp () == lwp; |
454296a2 | 1792 | }); |
d86d4aaf DE |
1793 | |
1794 | if (thread == NULL) | |
1795 | return NULL; | |
1796 | ||
9c80ecd6 | 1797 | return get_thread_lwp (thread); |
95954743 PA |
1798 | } |
1799 | ||
fa96cb38 | 1800 | /* Return the number of known LWPs in the tgid given by PID. */ |
0d62e5e8 | 1801 | |
fa96cb38 PA |
1802 | static int |
1803 | num_lwps (int pid) | |
1804 | { | |
fa96cb38 | 1805 | int count = 0; |
0d62e5e8 | 1806 | |
4d3bb80e SM |
1807 | for_each_thread (pid, [&] (thread_info *thread) |
1808 | { | |
9c80ecd6 | 1809 | count++; |
4d3bb80e | 1810 | }); |
3aee8918 | 1811 | |
fa96cb38 PA |
1812 | return count; |
1813 | } | |
d61ddec4 | 1814 | |
6d4ee8c6 GB |
1815 | /* See nat/linux-nat.h. */ |
1816 | ||
1817 | struct lwp_info * | |
1818 | iterate_over_lwps (ptid_t filter, | |
d3a70e03 | 1819 | gdb::function_view<iterate_over_lwps_ftype> callback) |
6d4ee8c6 | 1820 | { |
da4ae14a | 1821 | thread_info *thread = find_thread (filter, [&] (thread_info *thr_arg) |
6d1e5673 | 1822 | { |
da4ae14a | 1823 | lwp_info *lwp = get_thread_lwp (thr_arg); |
6d1e5673 | 1824 | |
d3a70e03 | 1825 | return callback (lwp); |
6d1e5673 | 1826 | }); |
6d4ee8c6 | 1827 | |
9c80ecd6 | 1828 | if (thread == NULL) |
6d4ee8c6 GB |
1829 | return NULL; |
1830 | ||
9c80ecd6 | 1831 | return get_thread_lwp (thread); |
6d4ee8c6 GB |
1832 | } |
1833 | ||
fd000fb3 TBA |
1834 | void |
1835 | linux_process_target::check_zombie_leaders () | |
fa96cb38 | 1836 | { |
fd000fb3 | 1837 | for_each_process ([this] (process_info *proc) { |
9179355e SM |
1838 | pid_t leader_pid = pid_of (proc); |
1839 | struct lwp_info *leader_lp; | |
1840 | ||
f2907e49 | 1841 | leader_lp = find_lwp_pid (ptid_t (leader_pid)); |
9179355e SM |
1842 | |
1843 | if (debug_threads) | |
1844 | debug_printf ("leader_pid=%d, leader_lp!=NULL=%d, " | |
1845 | "num_lwps=%d, zombie=%d\n", | |
1846 | leader_pid, leader_lp!= NULL, num_lwps (leader_pid), | |
1847 | linux_proc_pid_is_zombie (leader_pid)); | |
1848 | ||
1849 | if (leader_lp != NULL && !leader_lp->stopped | |
1850 | /* Check if there are other threads in the group, as we may | |
1851 | have raced with the inferior simply exiting. */ | |
1852 | && !last_thread_of_process_p (leader_pid) | |
1853 | && linux_proc_pid_is_zombie (leader_pid)) | |
1854 | { | |
1855 | /* A leader zombie can mean one of two things: | |
1856 | ||
1857 | - It exited, and there's an exit status pending | |
1858 | available, or only the leader exited (not the whole | |
1859 | program). In the latter case, we can't waitpid the | |
1860 | leader's exit status until all other threads are gone. | |
1861 | ||
1862 | - There are 3 or more threads in the group, and a thread | |
1863 | other than the leader exec'd. On an exec, the Linux | |
1864 | kernel destroys all other threads (except the execing | |
1865 | one) in the thread group, and resets the execing thread's | |
1866 | tid to the tgid. No exit notification is sent for the | |
1867 | execing thread -- from the ptracer's perspective, it | |
1868 | appears as though the execing thread just vanishes. | |
1869 | Until we reap all other threads except the leader and the | |
1870 | execing thread, the leader will be zombie, and the | |
1871 | execing thread will be in `D (disc sleep)'. As soon as | |
1872 | all other threads are reaped, the execing thread changes | |
1873 | it's tid to the tgid, and the previous (zombie) leader | |
1874 | vanishes, giving place to the "new" leader. We could try | |
1875 | distinguishing the exit and exec cases, by waiting once | |
1876 | more, and seeing if something comes out, but it doesn't | |
1877 | sound useful. The previous leader _does_ go away, and | |
1878 | we'll re-add the new one once we see the exec event | |
1879 | (which is just the same as what would happen if the | |
1880 | previous leader did exit voluntarily before some other | |
1881 | thread execs). */ | |
1882 | ||
1883 | if (debug_threads) | |
1884 | debug_printf ("CZL: Thread group leader %d zombie " | |
1885 | "(it exited, or another thread execd).\n", | |
1886 | leader_pid); | |
1887 | ||
1888 | delete_lwp (leader_lp); | |
1889 | } | |
1890 | }); | |
fa96cb38 | 1891 | } |
c3adc08c | 1892 | |
a1385b7b SM |
1893 | /* Callback for `find_thread'. Returns the first LWP that is not |
1894 | stopped. */ | |
d50171e4 | 1895 | |
a1385b7b SM |
1896 | static bool |
1897 | not_stopped_callback (thread_info *thread, ptid_t filter) | |
fa96cb38 | 1898 | { |
a1385b7b SM |
1899 | if (!thread->id.matches (filter)) |
1900 | return false; | |
47c0c975 | 1901 | |
a1385b7b | 1902 | lwp_info *lwp = get_thread_lwp (thread); |
fa96cb38 | 1903 | |
a1385b7b | 1904 | return !lwp->stopped; |
0d62e5e8 | 1905 | } |
611cb4a5 | 1906 | |
863d01bd PA |
1907 | /* Increment LWP's suspend count. */ |
1908 | ||
1909 | static void | |
1910 | lwp_suspended_inc (struct lwp_info *lwp) | |
1911 | { | |
1912 | lwp->suspended++; | |
1913 | ||
1914 | if (debug_threads && lwp->suspended > 4) | |
1915 | { | |
1916 | struct thread_info *thread = get_lwp_thread (lwp); | |
1917 | ||
1918 | debug_printf ("LWP %ld has a suspiciously high suspend count," | |
1919 | " suspended=%d\n", lwpid_of (thread), lwp->suspended); | |
1920 | } | |
1921 | } | |
1922 | ||
1923 | /* Decrement LWP's suspend count. */ | |
1924 | ||
1925 | static void | |
1926 | lwp_suspended_decr (struct lwp_info *lwp) | |
1927 | { | |
1928 | lwp->suspended--; | |
1929 | ||
1930 | if (lwp->suspended < 0) | |
1931 | { | |
1932 | struct thread_info *thread = get_lwp_thread (lwp); | |
1933 | ||
1934 | internal_error (__FILE__, __LINE__, | |
1935 | "unsuspend LWP %ld, suspended=%d\n", lwpid_of (thread), | |
1936 | lwp->suspended); | |
1937 | } | |
1938 | } | |
1939 | ||
219f2f23 PA |
1940 | /* This function should only be called if the LWP got a SIGTRAP. |
1941 | ||
1942 | Handle any tracepoint steps or hits. Return true if a tracepoint | |
1943 | event was handled, 0 otherwise. */ | |
1944 | ||
1945 | static int | |
1946 | handle_tracepoints (struct lwp_info *lwp) | |
1947 | { | |
1948 | struct thread_info *tinfo = get_lwp_thread (lwp); | |
1949 | int tpoint_related_event = 0; | |
1950 | ||
582511be PA |
1951 | gdb_assert (lwp->suspended == 0); |
1952 | ||
7984d532 PA |
1953 | /* If this tracepoint hit causes a tracing stop, we'll immediately |
1954 | uninsert tracepoints. To do this, we temporarily pause all | |
1955 | threads, unpatch away, and then unpause threads. We need to make | |
1956 | sure the unpausing doesn't resume LWP too. */ | |
863d01bd | 1957 | lwp_suspended_inc (lwp); |
7984d532 | 1958 | |
219f2f23 PA |
1959 | /* And we need to be sure that any all-threads-stopping doesn't try |
1960 | to move threads out of the jump pads, as it could deadlock the | |
1961 | inferior (LWP could be in the jump pad, maybe even holding the | |
1962 | lock.) */ | |
1963 | ||
1964 | /* Do any necessary step collect actions. */ | |
1965 | tpoint_related_event |= tracepoint_finished_step (tinfo, lwp->stop_pc); | |
1966 | ||
fa593d66 PA |
1967 | tpoint_related_event |= handle_tracepoint_bkpts (tinfo, lwp->stop_pc); |
1968 | ||
219f2f23 PA |
1969 | /* See if we just hit a tracepoint and do its main collect |
1970 | actions. */ | |
1971 | tpoint_related_event |= tracepoint_was_hit (tinfo, lwp->stop_pc); | |
1972 | ||
863d01bd | 1973 | lwp_suspended_decr (lwp); |
7984d532 PA |
1974 | |
1975 | gdb_assert (lwp->suspended == 0); | |
229d26fc SM |
1976 | gdb_assert (!stabilizing_threads |
1977 | || (lwp->collecting_fast_tracepoint | |
1978 | != fast_tpoint_collect_result::not_collecting)); | |
7984d532 | 1979 | |
219f2f23 PA |
1980 | if (tpoint_related_event) |
1981 | { | |
1982 | if (debug_threads) | |
87ce2a04 | 1983 | debug_printf ("got a tracepoint event\n"); |
219f2f23 PA |
1984 | return 1; |
1985 | } | |
1986 | ||
1987 | return 0; | |
1988 | } | |
1989 | ||
13e567af TBA |
1990 | fast_tpoint_collect_result |
1991 | linux_process_target::linux_fast_tracepoint_collecting | |
1992 | (lwp_info *lwp, fast_tpoint_collect_status *status) | |
fa593d66 PA |
1993 | { |
1994 | CORE_ADDR thread_area; | |
d86d4aaf | 1995 | struct thread_info *thread = get_lwp_thread (lwp); |
fa593d66 | 1996 | |
fa593d66 PA |
1997 | /* Get the thread area address. This is used to recognize which |
1998 | thread is which when tracing with the in-process agent library. | |
1999 | We don't read anything from the address, and treat it as opaque; | |
2000 | it's the address itself that we assume is unique per-thread. */ | |
13e567af | 2001 | if (low_get_thread_area (lwpid_of (thread), &thread_area) == -1) |
229d26fc | 2002 | return fast_tpoint_collect_result::not_collecting; |
fa593d66 PA |
2003 | |
2004 | return fast_tracepoint_collecting (thread_area, lwp->stop_pc, status); | |
2005 | } | |
2006 | ||
13e567af TBA |
2007 | int |
2008 | linux_process_target::low_get_thread_area (int lwpid, CORE_ADDR *addrp) | |
2009 | { | |
2010 | return -1; | |
2011 | } | |
2012 | ||
d16f3f6c TBA |
2013 | bool |
2014 | linux_process_target::maybe_move_out_of_jump_pad (lwp_info *lwp, int *wstat) | |
fa593d66 | 2015 | { |
0bfdf32f | 2016 | struct thread_info *saved_thread; |
fa593d66 | 2017 | |
0bfdf32f GB |
2018 | saved_thread = current_thread; |
2019 | current_thread = get_lwp_thread (lwp); | |
fa593d66 PA |
2020 | |
2021 | if ((wstat == NULL | |
2022 | || (WIFSTOPPED (*wstat) && WSTOPSIG (*wstat) != SIGTRAP)) | |
2023 | && supports_fast_tracepoints () | |
58b4daa5 | 2024 | && agent_loaded_p ()) |
fa593d66 PA |
2025 | { |
2026 | struct fast_tpoint_collect_status status; | |
fa593d66 PA |
2027 | |
2028 | if (debug_threads) | |
87ce2a04 DE |
2029 | debug_printf ("Checking whether LWP %ld needs to move out of the " |
2030 | "jump pad.\n", | |
0bfdf32f | 2031 | lwpid_of (current_thread)); |
fa593d66 | 2032 | |
229d26fc SM |
2033 | fast_tpoint_collect_result r |
2034 | = linux_fast_tracepoint_collecting (lwp, &status); | |
fa593d66 PA |
2035 | |
2036 | if (wstat == NULL | |
2037 | || (WSTOPSIG (*wstat) != SIGILL | |
2038 | && WSTOPSIG (*wstat) != SIGFPE | |
2039 | && WSTOPSIG (*wstat) != SIGSEGV | |
2040 | && WSTOPSIG (*wstat) != SIGBUS)) | |
2041 | { | |
2042 | lwp->collecting_fast_tracepoint = r; | |
2043 | ||
229d26fc | 2044 | if (r != fast_tpoint_collect_result::not_collecting) |
fa593d66 | 2045 | { |
229d26fc SM |
2046 | if (r == fast_tpoint_collect_result::before_insn |
2047 | && lwp->exit_jump_pad_bkpt == NULL) | |
fa593d66 PA |
2048 | { |
2049 | /* Haven't executed the original instruction yet. | |
2050 | Set breakpoint there, and wait till it's hit, | |
2051 | then single-step until exiting the jump pad. */ | |
2052 | lwp->exit_jump_pad_bkpt | |
2053 | = set_breakpoint_at (status.adjusted_insn_addr, NULL); | |
2054 | } | |
2055 | ||
2056 | if (debug_threads) | |
87ce2a04 DE |
2057 | debug_printf ("Checking whether LWP %ld needs to move out of " |
2058 | "the jump pad...it does\n", | |
0bfdf32f GB |
2059 | lwpid_of (current_thread)); |
2060 | current_thread = saved_thread; | |
fa593d66 | 2061 | |
d16f3f6c | 2062 | return true; |
fa593d66 PA |
2063 | } |
2064 | } | |
2065 | else | |
2066 | { | |
2067 | /* If we get a synchronous signal while collecting, *and* | |
2068 | while executing the (relocated) original instruction, | |
2069 | reset the PC to point at the tpoint address, before | |
2070 | reporting to GDB. Otherwise, it's an IPA lib bug: just | |
2071 | report the signal to GDB, and pray for the best. */ | |
2072 | ||
229d26fc SM |
2073 | lwp->collecting_fast_tracepoint |
2074 | = fast_tpoint_collect_result::not_collecting; | |
fa593d66 | 2075 | |
229d26fc | 2076 | if (r != fast_tpoint_collect_result::not_collecting |
fa593d66 PA |
2077 | && (status.adjusted_insn_addr <= lwp->stop_pc |
2078 | && lwp->stop_pc < status.adjusted_insn_addr_end)) | |
2079 | { | |
2080 | siginfo_t info; | |
2081 | struct regcache *regcache; | |
2082 | ||
2083 | /* The si_addr on a few signals references the address | |
2084 | of the faulting instruction. Adjust that as | |
2085 | well. */ | |
2086 | if ((WSTOPSIG (*wstat) == SIGILL | |
2087 | || WSTOPSIG (*wstat) == SIGFPE | |
2088 | || WSTOPSIG (*wstat) == SIGBUS | |
2089 | || WSTOPSIG (*wstat) == SIGSEGV) | |
0bfdf32f | 2090 | && ptrace (PTRACE_GETSIGINFO, lwpid_of (current_thread), |
b8e1b30e | 2091 | (PTRACE_TYPE_ARG3) 0, &info) == 0 |
fa593d66 PA |
2092 | /* Final check just to make sure we don't clobber |
2093 | the siginfo of non-kernel-sent signals. */ | |
2094 | && (uintptr_t) info.si_addr == lwp->stop_pc) | |
2095 | { | |
2096 | info.si_addr = (void *) (uintptr_t) status.tpoint_addr; | |
0bfdf32f | 2097 | ptrace (PTRACE_SETSIGINFO, lwpid_of (current_thread), |
b8e1b30e | 2098 | (PTRACE_TYPE_ARG3) 0, &info); |
fa593d66 PA |
2099 | } |
2100 | ||
0bfdf32f | 2101 | regcache = get_thread_regcache (current_thread, 1); |
bf9ae9d8 | 2102 | low_set_pc (regcache, status.tpoint_addr); |
fa593d66 PA |
2103 | lwp->stop_pc = status.tpoint_addr; |
2104 | ||
2105 | /* Cancel any fast tracepoint lock this thread was | |
2106 | holding. */ | |
2107 | force_unlock_trace_buffer (); | |
2108 | } | |
2109 | ||
2110 | if (lwp->exit_jump_pad_bkpt != NULL) | |
2111 | { | |
2112 | if (debug_threads) | |
87ce2a04 DE |
2113 | debug_printf ("Cancelling fast exit-jump-pad: removing bkpt. " |
2114 | "stopping all threads momentarily.\n"); | |
fa593d66 PA |
2115 | |
2116 | stop_all_lwps (1, lwp); | |
fa593d66 PA |
2117 | |
2118 | delete_breakpoint (lwp->exit_jump_pad_bkpt); | |
2119 | lwp->exit_jump_pad_bkpt = NULL; | |
2120 | ||
2121 | unstop_all_lwps (1, lwp); | |
2122 | ||
2123 | gdb_assert (lwp->suspended >= 0); | |
2124 | } | |
2125 | } | |
2126 | } | |
2127 | ||
2128 | if (debug_threads) | |
87ce2a04 DE |
2129 | debug_printf ("Checking whether LWP %ld needs to move out of the " |
2130 | "jump pad...no\n", | |
0bfdf32f | 2131 | lwpid_of (current_thread)); |
0cccb683 | 2132 | |
0bfdf32f | 2133 | current_thread = saved_thread; |
d16f3f6c | 2134 | return false; |
fa593d66 PA |
2135 | } |
2136 | ||
2137 | /* Enqueue one signal in the "signals to report later when out of the | |
2138 | jump pad" list. */ | |
2139 | ||
2140 | static void | |
2141 | enqueue_one_deferred_signal (struct lwp_info *lwp, int *wstat) | |
2142 | { | |
2143 | struct pending_signals *p_sig; | |
d86d4aaf | 2144 | struct thread_info *thread = get_lwp_thread (lwp); |
fa593d66 PA |
2145 | |
2146 | if (debug_threads) | |
87ce2a04 | 2147 | debug_printf ("Deferring signal %d for LWP %ld.\n", |
d86d4aaf | 2148 | WSTOPSIG (*wstat), lwpid_of (thread)); |
fa593d66 PA |
2149 | |
2150 | if (debug_threads) | |
2151 | { | |
2152 | struct pending_signals *sig; | |
2153 | ||
2154 | for (sig = lwp->pending_signals_to_report; | |
2155 | sig != NULL; | |
2156 | sig = sig->prev) | |
87ce2a04 DE |
2157 | debug_printf (" Already queued %d\n", |
2158 | sig->signal); | |
fa593d66 | 2159 | |
87ce2a04 | 2160 | debug_printf (" (no more currently queued signals)\n"); |
fa593d66 PA |
2161 | } |
2162 | ||
1a981360 PA |
2163 | /* Don't enqueue non-RT signals if they are already in the deferred |
2164 | queue. (SIGSTOP being the easiest signal to see ending up here | |
2165 | twice) */ | |
2166 | if (WSTOPSIG (*wstat) < __SIGRTMIN) | |
2167 | { | |
2168 | struct pending_signals *sig; | |
2169 | ||
2170 | for (sig = lwp->pending_signals_to_report; | |
2171 | sig != NULL; | |
2172 | sig = sig->prev) | |
2173 | { | |
2174 | if (sig->signal == WSTOPSIG (*wstat)) | |
2175 | { | |
2176 | if (debug_threads) | |
87ce2a04 DE |
2177 | debug_printf ("Not requeuing already queued non-RT signal %d" |
2178 | " for LWP %ld\n", | |
2179 | sig->signal, | |
d86d4aaf | 2180 | lwpid_of (thread)); |
1a981360 PA |
2181 | return; |
2182 | } | |
2183 | } | |
2184 | } | |
2185 | ||
8d749320 | 2186 | p_sig = XCNEW (struct pending_signals); |
fa593d66 PA |
2187 | p_sig->prev = lwp->pending_signals_to_report; |
2188 | p_sig->signal = WSTOPSIG (*wstat); | |
8d749320 | 2189 | |
d86d4aaf | 2190 | ptrace (PTRACE_GETSIGINFO, lwpid_of (thread), (PTRACE_TYPE_ARG3) 0, |
56f7af9c | 2191 | &p_sig->info); |
fa593d66 PA |
2192 | |
2193 | lwp->pending_signals_to_report = p_sig; | |
2194 | } | |
2195 | ||
2196 | /* Dequeue one signal from the "signals to report later when out of | |
2197 | the jump pad" list. */ | |
2198 | ||
2199 | static int | |
2200 | dequeue_one_deferred_signal (struct lwp_info *lwp, int *wstat) | |
2201 | { | |
d86d4aaf DE |
2202 | struct thread_info *thread = get_lwp_thread (lwp); |
2203 | ||
fa593d66 PA |
2204 | if (lwp->pending_signals_to_report != NULL) |
2205 | { | |
2206 | struct pending_signals **p_sig; | |
2207 | ||
2208 | p_sig = &lwp->pending_signals_to_report; | |
2209 | while ((*p_sig)->prev != NULL) | |
2210 | p_sig = &(*p_sig)->prev; | |
2211 | ||
2212 | *wstat = W_STOPCODE ((*p_sig)->signal); | |
2213 | if ((*p_sig)->info.si_signo != 0) | |
d86d4aaf | 2214 | ptrace (PTRACE_SETSIGINFO, lwpid_of (thread), (PTRACE_TYPE_ARG3) 0, |
56f7af9c | 2215 | &(*p_sig)->info); |
fa593d66 PA |
2216 | free (*p_sig); |
2217 | *p_sig = NULL; | |
2218 | ||
2219 | if (debug_threads) | |
87ce2a04 | 2220 | debug_printf ("Reporting deferred signal %d for LWP %ld.\n", |
d86d4aaf | 2221 | WSTOPSIG (*wstat), lwpid_of (thread)); |
fa593d66 PA |
2222 | |
2223 | if (debug_threads) | |
2224 | { | |
2225 | struct pending_signals *sig; | |
2226 | ||
2227 | for (sig = lwp->pending_signals_to_report; | |
2228 | sig != NULL; | |
2229 | sig = sig->prev) | |
87ce2a04 DE |
2230 | debug_printf (" Still queued %d\n", |
2231 | sig->signal); | |
fa593d66 | 2232 | |
87ce2a04 | 2233 | debug_printf (" (no more queued signals)\n"); |
fa593d66 PA |
2234 | } |
2235 | ||
2236 | return 1; | |
2237 | } | |
2238 | ||
2239 | return 0; | |
2240 | } | |
2241 | ||
ac1bbaca TBA |
2242 | bool |
2243 | linux_process_target::check_stopped_by_watchpoint (lwp_info *child) | |
582511be | 2244 | { |
ac1bbaca TBA |
2245 | struct thread_info *saved_thread = current_thread; |
2246 | current_thread = get_lwp_thread (child); | |
d50171e4 | 2247 | |
ac1bbaca TBA |
2248 | if (low_stopped_by_watchpoint ()) |
2249 | { | |
2250 | child->stop_reason = TARGET_STOPPED_BY_WATCHPOINT; | |
2251 | child->stopped_data_address = low_stopped_data_address (); | |
2252 | } | |
582511be | 2253 | |
ac1bbaca | 2254 | current_thread = saved_thread; |
582511be | 2255 | |
ac1bbaca TBA |
2256 | return child->stop_reason == TARGET_STOPPED_BY_WATCHPOINT; |
2257 | } | |
d50171e4 | 2258 | |
ac1bbaca TBA |
2259 | bool |
2260 | linux_process_target::low_stopped_by_watchpoint () | |
2261 | { | |
2262 | return false; | |
2263 | } | |
d50171e4 | 2264 | |
ac1bbaca TBA |
2265 | CORE_ADDR |
2266 | linux_process_target::low_stopped_data_address () | |
2267 | { | |
2268 | return 0; | |
c4d9ceb6 YQ |
2269 | } |
2270 | ||
de0d863e DB |
2271 | /* Return the ptrace options that we want to try to enable. */ |
2272 | ||
2273 | static int | |
2274 | linux_low_ptrace_options (int attached) | |
2275 | { | |
c12a5089 | 2276 | client_state &cs = get_client_state (); |
de0d863e DB |
2277 | int options = 0; |
2278 | ||
2279 | if (!attached) | |
2280 | options |= PTRACE_O_EXITKILL; | |
2281 | ||
c12a5089 | 2282 | if (cs.report_fork_events) |
de0d863e DB |
2283 | options |= PTRACE_O_TRACEFORK; |
2284 | ||
c12a5089 | 2285 | if (cs.report_vfork_events) |
c269dbdb DB |
2286 | options |= (PTRACE_O_TRACEVFORK | PTRACE_O_TRACEVFORKDONE); |
2287 | ||
c12a5089 | 2288 | if (cs.report_exec_events) |
94585166 DB |
2289 | options |= PTRACE_O_TRACEEXEC; |
2290 | ||
82075af2 JS |
2291 | options |= PTRACE_O_TRACESYSGOOD; |
2292 | ||
de0d863e DB |
2293 | return options; |
2294 | } | |
2295 | ||
d16f3f6c TBA |
2296 | lwp_info * |
2297 | linux_process_target::filter_event (int lwpid, int wstat) | |
fa96cb38 | 2298 | { |
c12a5089 | 2299 | client_state &cs = get_client_state (); |
fa96cb38 PA |
2300 | struct lwp_info *child; |
2301 | struct thread_info *thread; | |
582511be | 2302 | int have_stop_pc = 0; |
fa96cb38 | 2303 | |
f2907e49 | 2304 | child = find_lwp_pid (ptid_t (lwpid)); |
fa96cb38 | 2305 | |
94585166 DB |
2306 | /* Check for stop events reported by a process we didn't already |
2307 | know about - anything not already in our LWP list. | |
2308 | ||
2309 | If we're expecting to receive stopped processes after | |
2310 | fork, vfork, and clone events, then we'll just add the | |
2311 | new one to our list and go back to waiting for the event | |
2312 | to be reported - the stopped process might be returned | |
2313 | from waitpid before or after the event is. | |
2314 | ||
2315 | But note the case of a non-leader thread exec'ing after the | |
2316 | leader having exited, and gone from our lists (because | |
2317 | check_zombie_leaders deleted it). The non-leader thread | |
2318 | changes its tid to the tgid. */ | |
2319 | ||
2320 | if (WIFSTOPPED (wstat) && child == NULL && WSTOPSIG (wstat) == SIGTRAP | |
2321 | && linux_ptrace_get_extended_event (wstat) == PTRACE_EVENT_EXEC) | |
2322 | { | |
2323 | ptid_t child_ptid; | |
2324 | ||
2325 | /* A multi-thread exec after we had seen the leader exiting. */ | |
2326 | if (debug_threads) | |
2327 | { | |
2328 | debug_printf ("LLW: Re-adding thread group leader LWP %d" | |
2329 | "after exec.\n", lwpid); | |
2330 | } | |
2331 | ||
fd79271b | 2332 | child_ptid = ptid_t (lwpid, lwpid, 0); |
94585166 DB |
2333 | child = add_lwp (child_ptid); |
2334 | child->stopped = 1; | |
2335 | current_thread = child->thread; | |
2336 | } | |
2337 | ||
fa96cb38 PA |
2338 | /* If we didn't find a process, one of two things presumably happened: |
2339 | - A process we started and then detached from has exited. Ignore it. | |
2340 | - A process we are controlling has forked and the new child's stop | |
2341 | was reported to us by the kernel. Save its PID. */ | |
2342 | if (child == NULL && WIFSTOPPED (wstat)) | |
2343 | { | |
2344 | add_to_pid_list (&stopped_pids, lwpid, wstat); | |
2345 | return NULL; | |
2346 | } | |
2347 | else if (child == NULL) | |
2348 | return NULL; | |
2349 | ||
2350 | thread = get_lwp_thread (child); | |
2351 | ||
2352 | child->stopped = 1; | |
2353 | ||
2354 | child->last_status = wstat; | |
2355 | ||
582511be PA |
2356 | /* Check if the thread has exited. */ |
2357 | if ((WIFEXITED (wstat) || WIFSIGNALED (wstat))) | |
2358 | { | |
2359 | if (debug_threads) | |
2360 | debug_printf ("LLFE: %d exited.\n", lwpid); | |
f50bf8e5 YQ |
2361 | |
2362 | if (finish_step_over (child)) | |
2363 | { | |
2364 | /* Unsuspend all other LWPs, and set them back running again. */ | |
2365 | unsuspend_all_lwps (child); | |
2366 | } | |
2367 | ||
65706a29 PA |
2368 | /* If there is at least one more LWP, then the exit signal was |
2369 | not the end of the debugged application and should be | |
2370 | ignored, unless GDB wants to hear about thread exits. */ | |
c12a5089 | 2371 | if (cs.report_thread_events |
65706a29 | 2372 | || last_thread_of_process_p (pid_of (thread))) |
582511be | 2373 | { |
65706a29 PA |
2374 | /* Since events are serialized to GDB core, and we can't |
2375 | report this one right now. Leave the status pending for | |
2376 | the next time we're able to report it. */ | |
2377 | mark_lwp_dead (child, wstat); | |
2378 | return child; | |
582511be PA |
2379 | } |
2380 | else | |
2381 | { | |
65706a29 PA |
2382 | delete_lwp (child); |
2383 | return NULL; | |
582511be PA |
2384 | } |
2385 | } | |
2386 | ||
2387 | gdb_assert (WIFSTOPPED (wstat)); | |
2388 | ||
fa96cb38 PA |
2389 | if (WIFSTOPPED (wstat)) |
2390 | { | |
2391 | struct process_info *proc; | |
2392 | ||
c06cbd92 | 2393 | /* Architecture-specific setup after inferior is running. */ |
fa96cb38 | 2394 | proc = find_process_pid (pid_of (thread)); |
c06cbd92 | 2395 | if (proc->tdesc == NULL) |
fa96cb38 | 2396 | { |
c06cbd92 YQ |
2397 | if (proc->attached) |
2398 | { | |
c06cbd92 YQ |
2399 | /* This needs to happen after we have attached to the |
2400 | inferior and it is stopped for the first time, but | |
2401 | before we access any inferior registers. */ | |
797bcff5 | 2402 | arch_setup_thread (thread); |
c06cbd92 YQ |
2403 | } |
2404 | else | |
2405 | { | |
2406 | /* The process is started, but GDBserver will do | |
2407 | architecture-specific setup after the program stops at | |
2408 | the first instruction. */ | |
2409 | child->status_pending_p = 1; | |
2410 | child->status_pending = wstat; | |
2411 | return child; | |
2412 | } | |
fa96cb38 PA |
2413 | } |
2414 | } | |
2415 | ||
fa96cb38 PA |
2416 | if (WIFSTOPPED (wstat) && child->must_set_ptrace_flags) |
2417 | { | |
beed38b8 | 2418 | struct process_info *proc = find_process_pid (pid_of (thread)); |
de0d863e | 2419 | int options = linux_low_ptrace_options (proc->attached); |
beed38b8 | 2420 | |
de0d863e | 2421 | linux_enable_event_reporting (lwpid, options); |
fa96cb38 PA |
2422 | child->must_set_ptrace_flags = 0; |
2423 | } | |
2424 | ||
82075af2 JS |
2425 | /* Always update syscall_state, even if it will be filtered later. */ |
2426 | if (WIFSTOPPED (wstat) && WSTOPSIG (wstat) == SYSCALL_SIGTRAP) | |
2427 | { | |
2428 | child->syscall_state | |
2429 | = (child->syscall_state == TARGET_WAITKIND_SYSCALL_ENTRY | |
2430 | ? TARGET_WAITKIND_SYSCALL_RETURN | |
2431 | : TARGET_WAITKIND_SYSCALL_ENTRY); | |
2432 | } | |
2433 | else | |
2434 | { | |
2435 | /* Almost all other ptrace-stops are known to be outside of system | |
2436 | calls, with further exceptions in handle_extended_wait. */ | |
2437 | child->syscall_state = TARGET_WAITKIND_IGNORE; | |
2438 | } | |
2439 | ||
e7ad2f14 PA |
2440 | /* Be careful to not overwrite stop_pc until save_stop_reason is |
2441 | called. */ | |
fa96cb38 | 2442 | if (WIFSTOPPED (wstat) && WSTOPSIG (wstat) == SIGTRAP |
89a5711c | 2443 | && linux_is_extended_waitstatus (wstat)) |
fa96cb38 | 2444 | { |
582511be | 2445 | child->stop_pc = get_pc (child); |
94585166 | 2446 | if (handle_extended_wait (&child, wstat)) |
de0d863e DB |
2447 | { |
2448 | /* The event has been handled, so just return without | |
2449 | reporting it. */ | |
2450 | return NULL; | |
2451 | } | |
fa96cb38 PA |
2452 | } |
2453 | ||
80aea927 | 2454 | if (linux_wstatus_maybe_breakpoint (wstat)) |
582511be | 2455 | { |
e7ad2f14 | 2456 | if (save_stop_reason (child)) |
582511be PA |
2457 | have_stop_pc = 1; |
2458 | } | |
2459 | ||
2460 | if (!have_stop_pc) | |
2461 | child->stop_pc = get_pc (child); | |
2462 | ||
fa96cb38 PA |
2463 | if (WIFSTOPPED (wstat) && WSTOPSIG (wstat) == SIGSTOP |
2464 | && child->stop_expected) | |
2465 | { | |
2466 | if (debug_threads) | |
2467 | debug_printf ("Expected stop.\n"); | |
2468 | child->stop_expected = 0; | |
2469 | ||
2470 | if (thread->last_resume_kind == resume_stop) | |
2471 | { | |
2472 | /* We want to report the stop to the core. Treat the | |
2473 | SIGSTOP as a normal event. */ | |
2bf6fb9d PA |
2474 | if (debug_threads) |
2475 | debug_printf ("LLW: resume_stop SIGSTOP caught for %s.\n", | |
2476 | target_pid_to_str (ptid_of (thread))); | |
fa96cb38 PA |
2477 | } |
2478 | else if (stopping_threads != NOT_STOPPING_THREADS) | |
2479 | { | |
2480 | /* Stopping threads. We don't want this SIGSTOP to end up | |
582511be | 2481 | pending. */ |
2bf6fb9d PA |
2482 | if (debug_threads) |
2483 | debug_printf ("LLW: SIGSTOP caught for %s " | |
2484 | "while stopping threads.\n", | |
2485 | target_pid_to_str (ptid_of (thread))); | |
fa96cb38 PA |
2486 | return NULL; |
2487 | } | |
2488 | else | |
2489 | { | |
2bf6fb9d PA |
2490 | /* This is a delayed SIGSTOP. Filter out the event. */ |
2491 | if (debug_threads) | |
2492 | debug_printf ("LLW: %s %s, 0, 0 (discard delayed SIGSTOP)\n", | |
2493 | child->stepping ? "step" : "continue", | |
2494 | target_pid_to_str (ptid_of (thread))); | |
2495 | ||
df95181f | 2496 | resume_one_lwp (child, child->stepping, 0, NULL); |
fa96cb38 PA |
2497 | return NULL; |
2498 | } | |
2499 | } | |
2500 | ||
582511be PA |
2501 | child->status_pending_p = 1; |
2502 | child->status_pending = wstat; | |
fa96cb38 PA |
2503 | return child; |
2504 | } | |
2505 | ||
f79b145d YQ |
2506 | /* Return true if THREAD is doing hardware single step. */ |
2507 | ||
2508 | static int | |
2509 | maybe_hw_step (struct thread_info *thread) | |
2510 | { | |
2511 | if (can_hardware_single_step ()) | |
2512 | return 1; | |
2513 | else | |
2514 | { | |
3b9a79ef | 2515 | /* GDBserver must insert single-step breakpoint for software |
f79b145d | 2516 | single step. */ |
3b9a79ef | 2517 | gdb_assert (has_single_step_breakpoints (thread)); |
f79b145d YQ |
2518 | return 0; |
2519 | } | |
2520 | } | |
2521 | ||
df95181f TBA |
2522 | void |
2523 | linux_process_target::resume_stopped_resumed_lwps (thread_info *thread) | |
20ba1ce6 | 2524 | { |
20ba1ce6 PA |
2525 | struct lwp_info *lp = get_thread_lwp (thread); |
2526 | ||
2527 | if (lp->stopped | |
863d01bd | 2528 | && !lp->suspended |
20ba1ce6 | 2529 | && !lp->status_pending_p |
20ba1ce6 PA |
2530 | && thread->last_status.kind == TARGET_WAITKIND_IGNORE) |
2531 | { | |
8901d193 YQ |
2532 | int step = 0; |
2533 | ||
2534 | if (thread->last_resume_kind == resume_step) | |
2535 | step = maybe_hw_step (thread); | |
20ba1ce6 PA |
2536 | |
2537 | if (debug_threads) | |
2538 | debug_printf ("RSRL: resuming stopped-resumed LWP %s at %s: step=%d\n", | |
2539 | target_pid_to_str (ptid_of (thread)), | |
2540 | paddress (lp->stop_pc), | |
2541 | step); | |
2542 | ||
df95181f | 2543 | resume_one_lwp (lp, step, GDB_SIGNAL_0, NULL); |
20ba1ce6 PA |
2544 | } |
2545 | } | |
2546 | ||
d16f3f6c TBA |
2547 | int |
2548 | linux_process_target::wait_for_event_filtered (ptid_t wait_ptid, | |
2549 | ptid_t filter_ptid, | |
2550 | int *wstatp, int options) | |
0d62e5e8 | 2551 | { |
d86d4aaf | 2552 | struct thread_info *event_thread; |
d50171e4 | 2553 | struct lwp_info *event_child, *requested_child; |
fa96cb38 | 2554 | sigset_t block_mask, prev_mask; |
d50171e4 | 2555 | |
fa96cb38 | 2556 | retry: |
d86d4aaf DE |
2557 | /* N.B. event_thread points to the thread_info struct that contains |
2558 | event_child. Keep them in sync. */ | |
2559 | event_thread = NULL; | |
d50171e4 PA |
2560 | event_child = NULL; |
2561 | requested_child = NULL; | |
0d62e5e8 | 2562 | |
95954743 | 2563 | /* Check for a lwp with a pending status. */ |
bd99dc85 | 2564 | |
d7e15655 | 2565 | if (filter_ptid == minus_one_ptid || filter_ptid.is_pid ()) |
0d62e5e8 | 2566 | { |
83e1b6c1 SM |
2567 | event_thread = find_thread_in_random ([&] (thread_info *thread) |
2568 | { | |
2569 | return status_pending_p_callback (thread, filter_ptid); | |
2570 | }); | |
2571 | ||
d86d4aaf DE |
2572 | if (event_thread != NULL) |
2573 | event_child = get_thread_lwp (event_thread); | |
2574 | if (debug_threads && event_thread) | |
2575 | debug_printf ("Got a pending child %ld\n", lwpid_of (event_thread)); | |
0d62e5e8 | 2576 | } |
d7e15655 | 2577 | else if (filter_ptid != null_ptid) |
0d62e5e8 | 2578 | { |
fa96cb38 | 2579 | requested_child = find_lwp_pid (filter_ptid); |
d50171e4 | 2580 | |
bde24c0a | 2581 | if (stopping_threads == NOT_STOPPING_THREADS |
fa593d66 | 2582 | && requested_child->status_pending_p |
229d26fc SM |
2583 | && (requested_child->collecting_fast_tracepoint |
2584 | != fast_tpoint_collect_result::not_collecting)) | |
fa593d66 PA |
2585 | { |
2586 | enqueue_one_deferred_signal (requested_child, | |
2587 | &requested_child->status_pending); | |
2588 | requested_child->status_pending_p = 0; | |
2589 | requested_child->status_pending = 0; | |
df95181f | 2590 | resume_one_lwp (requested_child, 0, 0, NULL); |
fa593d66 PA |
2591 | } |
2592 | ||
2593 | if (requested_child->suspended | |
2594 | && requested_child->status_pending_p) | |
38e08fca GB |
2595 | { |
2596 | internal_error (__FILE__, __LINE__, | |
2597 | "requesting an event out of a" | |
2598 | " suspended child?"); | |
2599 | } | |
fa593d66 | 2600 | |
d50171e4 | 2601 | if (requested_child->status_pending_p) |
d86d4aaf DE |
2602 | { |
2603 | event_child = requested_child; | |
2604 | event_thread = get_lwp_thread (event_child); | |
2605 | } | |
0d62e5e8 | 2606 | } |
611cb4a5 | 2607 | |
0d62e5e8 DJ |
2608 | if (event_child != NULL) |
2609 | { | |
bd99dc85 | 2610 | if (debug_threads) |
87ce2a04 | 2611 | debug_printf ("Got an event from pending child %ld (%04x)\n", |
d86d4aaf | 2612 | lwpid_of (event_thread), event_child->status_pending); |
fa96cb38 | 2613 | *wstatp = event_child->status_pending; |
bd99dc85 PA |
2614 | event_child->status_pending_p = 0; |
2615 | event_child->status_pending = 0; | |
0bfdf32f | 2616 | current_thread = event_thread; |
d86d4aaf | 2617 | return lwpid_of (event_thread); |
0d62e5e8 DJ |
2618 | } |
2619 | ||
fa96cb38 PA |
2620 | /* But if we don't find a pending event, we'll have to wait. |
2621 | ||
2622 | We only enter this loop if no process has a pending wait status. | |
2623 | Thus any action taken in response to a wait status inside this | |
2624 | loop is responding as soon as we detect the status, not after any | |
2625 | pending events. */ | |
d8301ad1 | 2626 | |
fa96cb38 PA |
2627 | /* Make sure SIGCHLD is blocked until the sigsuspend below. Block |
2628 | all signals while here. */ | |
2629 | sigfillset (&block_mask); | |
21987b9c | 2630 | gdb_sigmask (SIG_BLOCK, &block_mask, &prev_mask); |
fa96cb38 | 2631 | |
582511be PA |
2632 | /* Always pull all events out of the kernel. We'll randomly select |
2633 | an event LWP out of all that have events, to prevent | |
2634 | starvation. */ | |
fa96cb38 | 2635 | while (event_child == NULL) |
0d62e5e8 | 2636 | { |
fa96cb38 | 2637 | pid_t ret = 0; |
0d62e5e8 | 2638 | |
fa96cb38 PA |
2639 | /* Always use -1 and WNOHANG, due to couple of a kernel/ptrace |
2640 | quirks: | |
0d62e5e8 | 2641 | |
fa96cb38 PA |
2642 | - If the thread group leader exits while other threads in the |
2643 | thread group still exist, waitpid(TGID, ...) hangs. That | |
2644 | waitpid won't return an exit status until the other threads | |
2645 | in the group are reaped. | |
611cb4a5 | 2646 | |
fa96cb38 PA |
2647 | - When a non-leader thread execs, that thread just vanishes |
2648 | without reporting an exit (so we'd hang if we waited for it | |
2649 | explicitly in that case). The exec event is reported to | |
94585166 | 2650 | the TGID pid. */ |
fa96cb38 PA |
2651 | errno = 0; |
2652 | ret = my_waitpid (-1, wstatp, options | WNOHANG); | |
d8301ad1 | 2653 | |
fa96cb38 PA |
2654 | if (debug_threads) |
2655 | debug_printf ("LWFE: waitpid(-1, ...) returned %d, %s\n", | |
6d91ce9a | 2656 | ret, errno ? safe_strerror (errno) : "ERRNO-OK"); |
0d62e5e8 | 2657 | |
fa96cb38 | 2658 | if (ret > 0) |
0d62e5e8 | 2659 | { |
89be2091 | 2660 | if (debug_threads) |
bd99dc85 | 2661 | { |
fa96cb38 PA |
2662 | debug_printf ("LLW: waitpid %ld received %s\n", |
2663 | (long) ret, status_to_str (*wstatp)); | |
bd99dc85 | 2664 | } |
89be2091 | 2665 | |
582511be PA |
2666 | /* Filter all events. IOW, leave all events pending. We'll |
2667 | randomly select an event LWP out of all that have events | |
2668 | below. */ | |
d16f3f6c | 2669 | filter_event (ret, *wstatp); |
fa96cb38 PA |
2670 | /* Retry until nothing comes out of waitpid. A single |
2671 | SIGCHLD can indicate more than one child stopped. */ | |
89be2091 DJ |
2672 | continue; |
2673 | } | |
2674 | ||
20ba1ce6 PA |
2675 | /* Now that we've pulled all events out of the kernel, resume |
2676 | LWPs that don't have an interesting event to report. */ | |
2677 | if (stopping_threads == NOT_STOPPING_THREADS) | |
df95181f TBA |
2678 | for_each_thread ([this] (thread_info *thread) |
2679 | { | |
2680 | resume_stopped_resumed_lwps (thread); | |
2681 | }); | |
20ba1ce6 PA |
2682 | |
2683 | /* ... and find an LWP with a status to report to the core, if | |
2684 | any. */ | |
83e1b6c1 SM |
2685 | event_thread = find_thread_in_random ([&] (thread_info *thread) |
2686 | { | |
2687 | return status_pending_p_callback (thread, filter_ptid); | |
2688 | }); | |
2689 | ||
582511be PA |
2690 | if (event_thread != NULL) |
2691 | { | |
2692 | event_child = get_thread_lwp (event_thread); | |
2693 | *wstatp = event_child->status_pending; | |
2694 | event_child->status_pending_p = 0; | |
2695 | event_child->status_pending = 0; | |
2696 | break; | |
2697 | } | |
2698 | ||
fa96cb38 PA |
2699 | /* Check for zombie thread group leaders. Those can't be reaped |
2700 | until all other threads in the thread group are. */ | |
2701 | check_zombie_leaders (); | |
2702 | ||
a1385b7b SM |
2703 | auto not_stopped = [&] (thread_info *thread) |
2704 | { | |
2705 | return not_stopped_callback (thread, wait_ptid); | |
2706 | }; | |
2707 | ||
fa96cb38 PA |
2708 | /* If there are no resumed children left in the set of LWPs we |
2709 | want to wait for, bail. We can't just block in | |
2710 | waitpid/sigsuspend, because lwps might have been left stopped | |
2711 | in trace-stop state, and we'd be stuck forever waiting for | |
2712 | their status to change (which would only happen if we resumed | |
2713 | them). Even if WNOHANG is set, this return code is preferred | |
2714 | over 0 (below), as it is more detailed. */ | |
a1385b7b | 2715 | if (find_thread (not_stopped) == NULL) |
a6dbe5df | 2716 | { |
fa96cb38 PA |
2717 | if (debug_threads) |
2718 | debug_printf ("LLW: exit (no unwaited-for LWP)\n"); | |
21987b9c | 2719 | gdb_sigmask (SIG_SETMASK, &prev_mask, NULL); |
fa96cb38 | 2720 | return -1; |
a6dbe5df PA |
2721 | } |
2722 | ||
fa96cb38 PA |
2723 | /* No interesting event to report to the caller. */ |
2724 | if ((options & WNOHANG)) | |
24a09b5f | 2725 | { |
fa96cb38 PA |
2726 | if (debug_threads) |
2727 | debug_printf ("WNOHANG set, no event found\n"); | |
2728 | ||
21987b9c | 2729 | gdb_sigmask (SIG_SETMASK, &prev_mask, NULL); |
fa96cb38 | 2730 | return 0; |
24a09b5f DJ |
2731 | } |
2732 | ||
fa96cb38 PA |
2733 | /* Block until we get an event reported with SIGCHLD. */ |
2734 | if (debug_threads) | |
2735 | debug_printf ("sigsuspend'ing\n"); | |
d50171e4 | 2736 | |
fa96cb38 | 2737 | sigsuspend (&prev_mask); |
21987b9c | 2738 | gdb_sigmask (SIG_SETMASK, &prev_mask, NULL); |
fa96cb38 PA |
2739 | goto retry; |
2740 | } | |
d50171e4 | 2741 | |
21987b9c | 2742 | gdb_sigmask (SIG_SETMASK, &prev_mask, NULL); |
d50171e4 | 2743 | |
0bfdf32f | 2744 | current_thread = event_thread; |
d50171e4 | 2745 | |
fa96cb38 PA |
2746 | return lwpid_of (event_thread); |
2747 | } | |
2748 | ||
d16f3f6c TBA |
2749 | int |
2750 | linux_process_target::wait_for_event (ptid_t ptid, int *wstatp, int options) | |
fa96cb38 | 2751 | { |
d16f3f6c | 2752 | return wait_for_event_filtered (ptid, ptid, wstatp, options); |
611cb4a5 DJ |
2753 | } |
2754 | ||
6bf5e0ba PA |
2755 | /* Select one LWP out of those that have events pending. */ |
2756 | ||
2757 | static void | |
2758 | select_event_lwp (struct lwp_info **orig_lp) | |
2759 | { | |
582511be PA |
2760 | struct thread_info *event_thread = NULL; |
2761 | ||
2762 | /* In all-stop, give preference to the LWP that is being | |
2763 | single-stepped. There will be at most one, and it's the LWP that | |
2764 | the core is most interested in. If we didn't do this, then we'd | |
2765 | have to handle pending step SIGTRAPs somehow in case the core | |
2766 | later continues the previously-stepped thread, otherwise we'd | |
2767 | report the pending SIGTRAP, and the core, not having stepped the | |
2768 | thread, wouldn't understand what the trap was for, and therefore | |
2769 | would report it to the user as a random signal. */ | |
2770 | if (!non_stop) | |
6bf5e0ba | 2771 | { |
39a64da5 SM |
2772 | event_thread = find_thread ([] (thread_info *thread) |
2773 | { | |
2774 | lwp_info *lp = get_thread_lwp (thread); | |
2775 | ||
2776 | return (thread->last_status.kind == TARGET_WAITKIND_IGNORE | |
2777 | && thread->last_resume_kind == resume_step | |
2778 | && lp->status_pending_p); | |
2779 | }); | |
2780 | ||
582511be PA |
2781 | if (event_thread != NULL) |
2782 | { | |
2783 | if (debug_threads) | |
2784 | debug_printf ("SEL: Select single-step %s\n", | |
2785 | target_pid_to_str (ptid_of (event_thread))); | |
2786 | } | |
6bf5e0ba | 2787 | } |
582511be | 2788 | if (event_thread == NULL) |
6bf5e0ba PA |
2789 | { |
2790 | /* No single-stepping LWP. Select one at random, out of those | |
b90fc188 | 2791 | which have had events. */ |
6bf5e0ba | 2792 | |
b0319eaa | 2793 | event_thread = find_thread_in_random ([&] (thread_info *thread) |
39a64da5 SM |
2794 | { |
2795 | lwp_info *lp = get_thread_lwp (thread); | |
2796 | ||
b0319eaa TT |
2797 | /* Only resumed LWPs that have an event pending. */ |
2798 | return (thread->last_status.kind == TARGET_WAITKIND_IGNORE | |
2799 | && lp->status_pending_p); | |
39a64da5 | 2800 | }); |
6bf5e0ba PA |
2801 | } |
2802 | ||
d86d4aaf | 2803 | if (event_thread != NULL) |
6bf5e0ba | 2804 | { |
d86d4aaf DE |
2805 | struct lwp_info *event_lp = get_thread_lwp (event_thread); |
2806 | ||
6bf5e0ba PA |
2807 | /* Switch the event LWP. */ |
2808 | *orig_lp = event_lp; | |
2809 | } | |
2810 | } | |
2811 | ||
7984d532 PA |
2812 | /* Decrement the suspend count of all LWPs, except EXCEPT, if non |
2813 | NULL. */ | |
2814 | ||
2815 | static void | |
2816 | unsuspend_all_lwps (struct lwp_info *except) | |
2817 | { | |
139720c5 SM |
2818 | for_each_thread ([&] (thread_info *thread) |
2819 | { | |
2820 | lwp_info *lwp = get_thread_lwp (thread); | |
2821 | ||
2822 | if (lwp != except) | |
2823 | lwp_suspended_decr (lwp); | |
2824 | }); | |
7984d532 PA |
2825 | } |
2826 | ||
5a6b0a41 | 2827 | static bool lwp_running (thread_info *thread); |
fa593d66 PA |
2828 | |
2829 | /* Stabilize threads (move out of jump pads). | |
2830 | ||
2831 | If a thread is midway collecting a fast tracepoint, we need to | |
2832 | finish the collection and move it out of the jump pad before | |
2833 | reporting the signal. | |
2834 | ||
2835 | This avoids recursion while collecting (when a signal arrives | |
2836 | midway, and the signal handler itself collects), which would trash | |
2837 | the trace buffer. In case the user set a breakpoint in a signal | |
2838 | handler, this avoids the backtrace showing the jump pad, etc.. | |
2839 | Most importantly, there are certain things we can't do safely if | |
2840 | threads are stopped in a jump pad (or in its callee's). For | |
2841 | example: | |
2842 | ||
2843 | - starting a new trace run. A thread still collecting the | |
2844 | previous run, could trash the trace buffer when resumed. The trace | |
2845 | buffer control structures would have been reset but the thread had | |
2846 | no way to tell. The thread could even midway memcpy'ing to the | |
2847 | buffer, which would mean that when resumed, it would clobber the | |
2848 | trace buffer that had been set for a new run. | |
2849 | ||
2850 | - we can't rewrite/reuse the jump pads for new tracepoints | |
2851 | safely. Say you do tstart while a thread is stopped midway while | |
2852 | collecting. When the thread is later resumed, it finishes the | |
2853 | collection, and returns to the jump pad, to execute the original | |
2854 | instruction that was under the tracepoint jump at the time the | |
2855 | older run had been started. If the jump pad had been rewritten | |
2856 | since for something else in the new run, the thread would now | |
2857 | execute the wrong / random instructions. */ | |
2858 | ||
5c9eb2f2 TBA |
2859 | void |
2860 | linux_process_target::stabilize_threads () | |
fa593d66 | 2861 | { |
13e567af TBA |
2862 | thread_info *thread_stuck = find_thread ([this] (thread_info *thread) |
2863 | { | |
2864 | return stuck_in_jump_pad (thread); | |
2865 | }); | |
fa593d66 | 2866 | |
d86d4aaf | 2867 | if (thread_stuck != NULL) |
fa593d66 | 2868 | { |
b4d51a55 | 2869 | if (debug_threads) |
87ce2a04 | 2870 | debug_printf ("can't stabilize, LWP %ld is stuck in jump pad\n", |
d86d4aaf | 2871 | lwpid_of (thread_stuck)); |
fa593d66 PA |
2872 | return; |
2873 | } | |
2874 | ||
fcb056a5 | 2875 | thread_info *saved_thread = current_thread; |
fa593d66 PA |
2876 | |
2877 | stabilizing_threads = 1; | |
2878 | ||
2879 | /* Kick 'em all. */ | |
d16f3f6c TBA |
2880 | for_each_thread ([this] (thread_info *thread) |
2881 | { | |
2882 | move_out_of_jump_pad (thread); | |
2883 | }); | |
fa593d66 PA |
2884 | |
2885 | /* Loop until all are stopped out of the jump pads. */ | |
5a6b0a41 | 2886 | while (find_thread (lwp_running) != NULL) |
fa593d66 PA |
2887 | { |
2888 | struct target_waitstatus ourstatus; | |
2889 | struct lwp_info *lwp; | |
fa593d66 PA |
2890 | int wstat; |
2891 | ||
2892 | /* Note that we go through the full wait even loop. While | |
2893 | moving threads out of jump pad, we need to be able to step | |
2894 | over internal breakpoints and such. */ | |
d16f3f6c | 2895 | wait_1 (minus_one_ptid, &ourstatus, 0); |
fa593d66 PA |
2896 | |
2897 | if (ourstatus.kind == TARGET_WAITKIND_STOPPED) | |
2898 | { | |
0bfdf32f | 2899 | lwp = get_thread_lwp (current_thread); |
fa593d66 PA |
2900 | |
2901 | /* Lock it. */ | |
863d01bd | 2902 | lwp_suspended_inc (lwp); |
fa593d66 | 2903 | |
a493e3e2 | 2904 | if (ourstatus.value.sig != GDB_SIGNAL_0 |
0bfdf32f | 2905 | || current_thread->last_resume_kind == resume_stop) |
fa593d66 | 2906 | { |
2ea28649 | 2907 | wstat = W_STOPCODE (gdb_signal_to_host (ourstatus.value.sig)); |
fa593d66 PA |
2908 | enqueue_one_deferred_signal (lwp, &wstat); |
2909 | } | |
2910 | } | |
2911 | } | |
2912 | ||
fcdad592 | 2913 | unsuspend_all_lwps (NULL); |
fa593d66 PA |
2914 | |
2915 | stabilizing_threads = 0; | |
2916 | ||
0bfdf32f | 2917 | current_thread = saved_thread; |
fa593d66 | 2918 | |
b4d51a55 | 2919 | if (debug_threads) |
fa593d66 | 2920 | { |
13e567af TBA |
2921 | thread_stuck = find_thread ([this] (thread_info *thread) |
2922 | { | |
2923 | return stuck_in_jump_pad (thread); | |
2924 | }); | |
fcb056a5 | 2925 | |
d86d4aaf | 2926 | if (thread_stuck != NULL) |
87ce2a04 | 2927 | debug_printf ("couldn't stabilize, LWP %ld got stuck in jump pad\n", |
d86d4aaf | 2928 | lwpid_of (thread_stuck)); |
fa593d66 PA |
2929 | } |
2930 | } | |
2931 | ||
582511be PA |
2932 | /* Convenience function that is called when the kernel reports an |
2933 | event that is not passed out to GDB. */ | |
2934 | ||
2935 | static ptid_t | |
2936 | ignore_event (struct target_waitstatus *ourstatus) | |
2937 | { | |
2938 | /* If we got an event, there may still be others, as a single | |
2939 | SIGCHLD can indicate more than one child stopped. This forces | |
2940 | another target_wait call. */ | |
2941 | async_file_mark (); | |
2942 | ||
2943 | ourstatus->kind = TARGET_WAITKIND_IGNORE; | |
2944 | return null_ptid; | |
2945 | } | |
2946 | ||
fd000fb3 TBA |
2947 | ptid_t |
2948 | linux_process_target::filter_exit_event (lwp_info *event_child, | |
2949 | target_waitstatus *ourstatus) | |
65706a29 | 2950 | { |
c12a5089 | 2951 | client_state &cs = get_client_state (); |
65706a29 PA |
2952 | struct thread_info *thread = get_lwp_thread (event_child); |
2953 | ptid_t ptid = ptid_of (thread); | |
2954 | ||
2955 | if (!last_thread_of_process_p (pid_of (thread))) | |
2956 | { | |
c12a5089 | 2957 | if (cs.report_thread_events) |
65706a29 PA |
2958 | ourstatus->kind = TARGET_WAITKIND_THREAD_EXITED; |
2959 | else | |
2960 | ourstatus->kind = TARGET_WAITKIND_IGNORE; | |
2961 | ||
2962 | delete_lwp (event_child); | |
2963 | } | |
2964 | return ptid; | |
2965 | } | |
2966 | ||
82075af2 JS |
2967 | /* Returns 1 if GDB is interested in any event_child syscalls. */ |
2968 | ||
2969 | static int | |
2970 | gdb_catching_syscalls_p (struct lwp_info *event_child) | |
2971 | { | |
2972 | struct thread_info *thread = get_lwp_thread (event_child); | |
2973 | struct process_info *proc = get_thread_process (thread); | |
2974 | ||
f27866ba | 2975 | return !proc->syscalls_to_catch.empty (); |
82075af2 JS |
2976 | } |
2977 | ||
2978 | /* Returns 1 if GDB is interested in the event_child syscall. | |
2979 | Only to be called when stopped reason is SYSCALL_SIGTRAP. */ | |
2980 | ||
2981 | static int | |
2982 | gdb_catch_this_syscall_p (struct lwp_info *event_child) | |
2983 | { | |
4cc32bec | 2984 | int sysno; |
82075af2 JS |
2985 | struct thread_info *thread = get_lwp_thread (event_child); |
2986 | struct process_info *proc = get_thread_process (thread); | |
2987 | ||
f27866ba | 2988 | if (proc->syscalls_to_catch.empty ()) |
82075af2 JS |
2989 | return 0; |
2990 | ||
f27866ba | 2991 | if (proc->syscalls_to_catch[0] == ANY_SYSCALL) |
82075af2 JS |
2992 | return 1; |
2993 | ||
4cc32bec | 2994 | get_syscall_trapinfo (event_child, &sysno); |
f27866ba SM |
2995 | |
2996 | for (int iter : proc->syscalls_to_catch) | |
82075af2 JS |
2997 | if (iter == sysno) |
2998 | return 1; | |
2999 | ||
3000 | return 0; | |
3001 | } | |
3002 | ||
d16f3f6c TBA |
3003 | ptid_t |
3004 | linux_process_target::wait_1 (ptid_t ptid, target_waitstatus *ourstatus, | |
3005 | int target_options) | |
da6d8c04 | 3006 | { |
c12a5089 | 3007 | client_state &cs = get_client_state (); |
e5f1222d | 3008 | int w; |
fc7238bb | 3009 | struct lwp_info *event_child; |
bd99dc85 | 3010 | int options; |
bd99dc85 | 3011 | int pid; |
6bf5e0ba PA |
3012 | int step_over_finished; |
3013 | int bp_explains_trap; | |
3014 | int maybe_internal_trap; | |
3015 | int report_to_gdb; | |
219f2f23 | 3016 | int trace_event; |
c2d6af84 | 3017 | int in_step_range; |
f2faf941 | 3018 | int any_resumed; |
bd99dc85 | 3019 | |
87ce2a04 DE |
3020 | if (debug_threads) |
3021 | { | |
3022 | debug_enter (); | |
d16f3f6c | 3023 | debug_printf ("wait_1: [%s]\n", target_pid_to_str (ptid)); |
87ce2a04 DE |
3024 | } |
3025 | ||
bd99dc85 PA |
3026 | /* Translate generic target options into linux options. */ |
3027 | options = __WALL; | |
3028 | if (target_options & TARGET_WNOHANG) | |
3029 | options |= WNOHANG; | |
0d62e5e8 | 3030 | |
fa593d66 PA |
3031 | bp_explains_trap = 0; |
3032 | trace_event = 0; | |
c2d6af84 | 3033 | in_step_range = 0; |
bd99dc85 PA |
3034 | ourstatus->kind = TARGET_WAITKIND_IGNORE; |
3035 | ||
83e1b6c1 SM |
3036 | auto status_pending_p_any = [&] (thread_info *thread) |
3037 | { | |
3038 | return status_pending_p_callback (thread, minus_one_ptid); | |
3039 | }; | |
3040 | ||
a1385b7b SM |
3041 | auto not_stopped = [&] (thread_info *thread) |
3042 | { | |
3043 | return not_stopped_callback (thread, minus_one_ptid); | |
3044 | }; | |
3045 | ||
f2faf941 | 3046 | /* Find a resumed LWP, if any. */ |
83e1b6c1 | 3047 | if (find_thread (status_pending_p_any) != NULL) |
f2faf941 | 3048 | any_resumed = 1; |
a1385b7b | 3049 | else if (find_thread (not_stopped) != NULL) |
f2faf941 PA |
3050 | any_resumed = 1; |
3051 | else | |
3052 | any_resumed = 0; | |
3053 | ||
d7e15655 | 3054 | if (step_over_bkpt == null_ptid) |
d16f3f6c | 3055 | pid = wait_for_event (ptid, &w, options); |
6bf5e0ba PA |
3056 | else |
3057 | { | |
3058 | if (debug_threads) | |
87ce2a04 DE |
3059 | debug_printf ("step_over_bkpt set [%s], doing a blocking wait\n", |
3060 | target_pid_to_str (step_over_bkpt)); | |
d16f3f6c | 3061 | pid = wait_for_event (step_over_bkpt, &w, options & ~WNOHANG); |
6bf5e0ba PA |
3062 | } |
3063 | ||
f2faf941 | 3064 | if (pid == 0 || (pid == -1 && !any_resumed)) |
87ce2a04 | 3065 | { |
fa96cb38 PA |
3066 | gdb_assert (target_options & TARGET_WNOHANG); |
3067 | ||
87ce2a04 DE |
3068 | if (debug_threads) |
3069 | { | |
d16f3f6c | 3070 | debug_printf ("wait_1 ret = null_ptid, " |
fa96cb38 | 3071 | "TARGET_WAITKIND_IGNORE\n"); |
87ce2a04 DE |
3072 | debug_exit (); |
3073 | } | |
fa96cb38 PA |
3074 | |
3075 | ourstatus->kind = TARGET_WAITKIND_IGNORE; | |
87ce2a04 DE |
3076 | return null_ptid; |
3077 | } | |
fa96cb38 PA |
3078 | else if (pid == -1) |
3079 | { | |
3080 | if (debug_threads) | |
3081 | { | |
d16f3f6c | 3082 | debug_printf ("wait_1 ret = null_ptid, " |
fa96cb38 PA |
3083 | "TARGET_WAITKIND_NO_RESUMED\n"); |
3084 | debug_exit (); | |
3085 | } | |
bd99dc85 | 3086 | |
fa96cb38 PA |
3087 | ourstatus->kind = TARGET_WAITKIND_NO_RESUMED; |
3088 | return null_ptid; | |
3089 | } | |
0d62e5e8 | 3090 | |
0bfdf32f | 3091 | event_child = get_thread_lwp (current_thread); |
0d62e5e8 | 3092 | |
d16f3f6c | 3093 | /* wait_for_event only returns an exit status for the last |
fa96cb38 PA |
3094 | child of a process. Report it. */ |
3095 | if (WIFEXITED (w) || WIFSIGNALED (w)) | |
da6d8c04 | 3096 | { |
fa96cb38 | 3097 | if (WIFEXITED (w)) |
0d62e5e8 | 3098 | { |
fa96cb38 PA |
3099 | ourstatus->kind = TARGET_WAITKIND_EXITED; |
3100 | ourstatus->value.integer = WEXITSTATUS (w); | |
bd99dc85 | 3101 | |
fa96cb38 | 3102 | if (debug_threads) |
bd99dc85 | 3103 | { |
d16f3f6c | 3104 | debug_printf ("wait_1 ret = %s, exited with " |
fa96cb38 | 3105 | "retcode %d\n", |
0bfdf32f | 3106 | target_pid_to_str (ptid_of (current_thread)), |
fa96cb38 PA |
3107 | WEXITSTATUS (w)); |
3108 | debug_exit (); | |
bd99dc85 | 3109 | } |
fa96cb38 PA |
3110 | } |
3111 | else | |
3112 | { | |
3113 | ourstatus->kind = TARGET_WAITKIND_SIGNALLED; | |
3114 | ourstatus->value.sig = gdb_signal_from_host (WTERMSIG (w)); | |
5b1c542e | 3115 | |
fa96cb38 PA |
3116 | if (debug_threads) |
3117 | { | |
d16f3f6c | 3118 | debug_printf ("wait_1 ret = %s, terminated with " |
fa96cb38 | 3119 | "signal %d\n", |
0bfdf32f | 3120 | target_pid_to_str (ptid_of (current_thread)), |
fa96cb38 PA |
3121 | WTERMSIG (w)); |
3122 | debug_exit (); | |
3123 | } | |
0d62e5e8 | 3124 | } |
fa96cb38 | 3125 | |
65706a29 PA |
3126 | if (ourstatus->kind == TARGET_WAITKIND_EXITED) |
3127 | return filter_exit_event (event_child, ourstatus); | |
3128 | ||
0bfdf32f | 3129 | return ptid_of (current_thread); |
da6d8c04 DJ |
3130 | } |
3131 | ||
2d97cd35 AT |
3132 | /* If step-over executes a breakpoint instruction, in the case of a |
3133 | hardware single step it means a gdb/gdbserver breakpoint had been | |
3134 | planted on top of a permanent breakpoint, in the case of a software | |
3135 | single step it may just mean that gdbserver hit the reinsert breakpoint. | |
e7ad2f14 | 3136 | The PC has been adjusted by save_stop_reason to point at |
2d97cd35 AT |
3137 | the breakpoint address. |
3138 | So in the case of the hardware single step advance the PC manually | |
3139 | past the breakpoint and in the case of software single step advance only | |
3b9a79ef | 3140 | if it's not the single_step_breakpoint we are hitting. |
2d97cd35 AT |
3141 | This avoids that a program would keep trapping a permanent breakpoint |
3142 | forever. */ | |
d7e15655 | 3143 | if (step_over_bkpt != null_ptid |
2d97cd35 AT |
3144 | && event_child->stop_reason == TARGET_STOPPED_BY_SW_BREAKPOINT |
3145 | && (event_child->stepping | |
3b9a79ef | 3146 | || !single_step_breakpoint_inserted_here (event_child->stop_pc))) |
8090aef2 | 3147 | { |
dd373349 AT |
3148 | int increment_pc = 0; |
3149 | int breakpoint_kind = 0; | |
3150 | CORE_ADDR stop_pc = event_child->stop_pc; | |
3151 | ||
d16f3f6c TBA |
3152 | breakpoint_kind = breakpoint_kind_from_current_state (&stop_pc); |
3153 | sw_breakpoint_from_kind (breakpoint_kind, &increment_pc); | |
8090aef2 PA |
3154 | |
3155 | if (debug_threads) | |
3156 | { | |
3157 | debug_printf ("step-over for %s executed software breakpoint\n", | |
3158 | target_pid_to_str (ptid_of (current_thread))); | |
3159 | } | |
3160 | ||
3161 | if (increment_pc != 0) | |
3162 | { | |
3163 | struct regcache *regcache | |
3164 | = get_thread_regcache (current_thread, 1); | |
3165 | ||
3166 | event_child->stop_pc += increment_pc; | |
bf9ae9d8 | 3167 | low_set_pc (regcache, event_child->stop_pc); |
8090aef2 | 3168 | |
d7146cda | 3169 | if (!low_breakpoint_at (event_child->stop_pc)) |
15c66dd6 | 3170 | event_child->stop_reason = TARGET_STOPPED_BY_NO_REASON; |
8090aef2 PA |
3171 | } |
3172 | } | |
3173 | ||
6bf5e0ba PA |
3174 | /* If this event was not handled before, and is not a SIGTRAP, we |
3175 | report it. SIGILL and SIGSEGV are also treated as traps in case | |
3176 | a breakpoint is inserted at the current PC. If this target does | |
3177 | not support internal breakpoints at all, we also report the | |
3178 | SIGTRAP without further processing; it's of no concern to us. */ | |
3179 | maybe_internal_trap | |
bf9ae9d8 | 3180 | = (low_supports_breakpoints () |
6bf5e0ba PA |
3181 | && (WSTOPSIG (w) == SIGTRAP |
3182 | || ((WSTOPSIG (w) == SIGILL | |
3183 | || WSTOPSIG (w) == SIGSEGV) | |
d7146cda | 3184 | && low_breakpoint_at (event_child->stop_pc)))); |
6bf5e0ba PA |
3185 | |
3186 | if (maybe_internal_trap) | |
3187 | { | |
3188 | /* Handle anything that requires bookkeeping before deciding to | |
3189 | report the event or continue waiting. */ | |
3190 | ||
3191 | /* First check if we can explain the SIGTRAP with an internal | |
3192 | breakpoint, or if we should possibly report the event to GDB. | |
3193 | Do this before anything that may remove or insert a | |
3194 | breakpoint. */ | |
3195 | bp_explains_trap = breakpoint_inserted_here (event_child->stop_pc); | |
3196 | ||
3197 | /* We have a SIGTRAP, possibly a step-over dance has just | |
3198 | finished. If so, tweak the state machine accordingly, | |
3b9a79ef YQ |
3199 | reinsert breakpoints and delete any single-step |
3200 | breakpoints. */ | |
6bf5e0ba PA |
3201 | step_over_finished = finish_step_over (event_child); |
3202 | ||
3203 | /* Now invoke the callbacks of any internal breakpoints there. */ | |
3204 | check_breakpoints (event_child->stop_pc); | |
3205 | ||
219f2f23 PA |
3206 | /* Handle tracepoint data collecting. This may overflow the |
3207 | trace buffer, and cause a tracing stop, removing | |
3208 | breakpoints. */ | |
3209 | trace_event = handle_tracepoints (event_child); | |
3210 | ||
6bf5e0ba PA |
3211 | if (bp_explains_trap) |
3212 | { | |
6bf5e0ba | 3213 | if (debug_threads) |
87ce2a04 | 3214 | debug_printf ("Hit a gdbserver breakpoint.\n"); |
6bf5e0ba PA |
3215 | } |
3216 | } | |
3217 | else | |
3218 | { | |
3219 | /* We have some other signal, possibly a step-over dance was in | |
3220 | progress, and it should be cancelled too. */ | |
3221 | step_over_finished = finish_step_over (event_child); | |
fa593d66 PA |
3222 | } |
3223 | ||
3224 | /* We have all the data we need. Either report the event to GDB, or | |
3225 | resume threads and keep waiting for more. */ | |
3226 | ||
3227 | /* If we're collecting a fast tracepoint, finish the collection and | |
3228 | move out of the jump pad before delivering a signal. See | |
3229 | linux_stabilize_threads. */ | |
3230 | ||
3231 | if (WIFSTOPPED (w) | |
3232 | && WSTOPSIG (w) != SIGTRAP | |
3233 | && supports_fast_tracepoints () | |
58b4daa5 | 3234 | && agent_loaded_p ()) |
fa593d66 PA |
3235 | { |
3236 | if (debug_threads) | |
87ce2a04 DE |
3237 | debug_printf ("Got signal %d for LWP %ld. Check if we need " |
3238 | "to defer or adjust it.\n", | |
0bfdf32f | 3239 | WSTOPSIG (w), lwpid_of (current_thread)); |
fa593d66 PA |
3240 | |
3241 | /* Allow debugging the jump pad itself. */ | |
0bfdf32f | 3242 | if (current_thread->last_resume_kind != resume_step |
fa593d66 PA |
3243 | && maybe_move_out_of_jump_pad (event_child, &w)) |
3244 | { | |
3245 | enqueue_one_deferred_signal (event_child, &w); | |
3246 | ||
3247 | if (debug_threads) | |
87ce2a04 | 3248 | debug_printf ("Signal %d for LWP %ld deferred (in jump pad)\n", |
0bfdf32f | 3249 | WSTOPSIG (w), lwpid_of (current_thread)); |
fa593d66 | 3250 | |
df95181f | 3251 | resume_one_lwp (event_child, 0, 0, NULL); |
582511be | 3252 | |
edeeb602 YQ |
3253 | if (debug_threads) |
3254 | debug_exit (); | |
582511be | 3255 | return ignore_event (ourstatus); |
fa593d66 PA |
3256 | } |
3257 | } | |
219f2f23 | 3258 | |
229d26fc SM |
3259 | if (event_child->collecting_fast_tracepoint |
3260 | != fast_tpoint_collect_result::not_collecting) | |
fa593d66 PA |
3261 | { |
3262 | if (debug_threads) | |
87ce2a04 DE |
3263 | debug_printf ("LWP %ld was trying to move out of the jump pad (%d). " |
3264 | "Check if we're already there.\n", | |
0bfdf32f | 3265 | lwpid_of (current_thread), |
229d26fc | 3266 | (int) event_child->collecting_fast_tracepoint); |
fa593d66 PA |
3267 | |
3268 | trace_event = 1; | |
3269 | ||
3270 | event_child->collecting_fast_tracepoint | |
3271 | = linux_fast_tracepoint_collecting (event_child, NULL); | |
3272 | ||
229d26fc SM |
3273 | if (event_child->collecting_fast_tracepoint |
3274 | != fast_tpoint_collect_result::before_insn) | |
fa593d66 PA |
3275 | { |
3276 | /* No longer need this breakpoint. */ | |
3277 | if (event_child->exit_jump_pad_bkpt != NULL) | |
3278 | { | |
3279 | if (debug_threads) | |
87ce2a04 DE |
3280 | debug_printf ("No longer need exit-jump-pad bkpt; removing it." |
3281 | "stopping all threads momentarily.\n"); | |
fa593d66 PA |
3282 | |
3283 | /* Other running threads could hit this breakpoint. | |
3284 | We don't handle moribund locations like GDB does, | |
3285 | instead we always pause all threads when removing | |
3286 | breakpoints, so that any step-over or | |
3287 | decr_pc_after_break adjustment is always taken | |
3288 | care of while the breakpoint is still | |
3289 | inserted. */ | |
3290 | stop_all_lwps (1, event_child); | |
fa593d66 PA |
3291 | |
3292 | delete_breakpoint (event_child->exit_jump_pad_bkpt); | |
3293 | event_child->exit_jump_pad_bkpt = NULL; | |
3294 | ||
3295 | unstop_all_lwps (1, event_child); | |
3296 | ||
3297 | gdb_assert (event_child->suspended >= 0); | |
3298 | } | |
3299 | } | |
3300 | ||
229d26fc SM |
3301 | if (event_child->collecting_fast_tracepoint |
3302 | == fast_tpoint_collect_result::not_collecting) | |
fa593d66 PA |
3303 | { |
3304 | if (debug_threads) | |
87ce2a04 DE |
3305 | debug_printf ("fast tracepoint finished " |
3306 | "collecting successfully.\n"); | |
fa593d66 PA |
3307 | |
3308 | /* We may have a deferred signal to report. */ | |
3309 | if (dequeue_one_deferred_signal (event_child, &w)) | |
3310 | { | |
3311 | if (debug_threads) | |
87ce2a04 | 3312 | debug_printf ("dequeued one signal.\n"); |
fa593d66 | 3313 | } |
3c11dd79 | 3314 | else |
fa593d66 | 3315 | { |
3c11dd79 | 3316 | if (debug_threads) |
87ce2a04 | 3317 | debug_printf ("no deferred signals.\n"); |
fa593d66 PA |
3318 | |
3319 | if (stabilizing_threads) | |
3320 | { | |
3321 | ourstatus->kind = TARGET_WAITKIND_STOPPED; | |
a493e3e2 | 3322 | ourstatus->value.sig = GDB_SIGNAL_0; |
87ce2a04 DE |
3323 | |
3324 | if (debug_threads) | |
3325 | { | |
d16f3f6c | 3326 | debug_printf ("wait_1 ret = %s, stopped " |
87ce2a04 | 3327 | "while stabilizing threads\n", |
0bfdf32f | 3328 | target_pid_to_str (ptid_of (current_thread))); |
87ce2a04 DE |
3329 | debug_exit (); |
3330 | } | |
3331 | ||
0bfdf32f | 3332 | return ptid_of (current_thread); |
fa593d66 PA |
3333 | } |
3334 | } | |
3335 | } | |
6bf5e0ba PA |
3336 | } |
3337 | ||
e471f25b PA |
3338 | /* Check whether GDB would be interested in this event. */ |
3339 | ||
82075af2 JS |
3340 | /* Check if GDB is interested in this syscall. */ |
3341 | if (WIFSTOPPED (w) | |
3342 | && WSTOPSIG (w) == SYSCALL_SIGTRAP | |
3343 | && !gdb_catch_this_syscall_p (event_child)) | |
3344 | { | |
3345 | if (debug_threads) | |
3346 | { | |
3347 | debug_printf ("Ignored syscall for LWP %ld.\n", | |
3348 | lwpid_of (current_thread)); | |
3349 | } | |
3350 | ||
df95181f | 3351 | resume_one_lwp (event_child, event_child->stepping, 0, NULL); |
edeeb602 YQ |
3352 | |
3353 | if (debug_threads) | |
3354 | debug_exit (); | |
82075af2 JS |
3355 | return ignore_event (ourstatus); |
3356 | } | |
3357 | ||
e471f25b PA |
3358 | /* If GDB is not interested in this signal, don't stop other |
3359 | threads, and don't report it to GDB. Just resume the inferior | |
3360 | right away. We do this for threading-related signals as well as | |
3361 | any that GDB specifically requested we ignore. But never ignore | |
3362 | SIGSTOP if we sent it ourselves, and do not ignore signals when | |
3363 | stepping - they may require special handling to skip the signal | |
c9587f88 AT |
3364 | handler. Also never ignore signals that could be caused by a |
3365 | breakpoint. */ | |
e471f25b | 3366 | if (WIFSTOPPED (w) |
0bfdf32f | 3367 | && current_thread->last_resume_kind != resume_step |
e471f25b | 3368 | && ( |
1a981360 | 3369 | #if defined (USE_THREAD_DB) && !defined (__ANDROID__) |
fe978cb0 | 3370 | (current_process ()->priv->thread_db != NULL |
e471f25b PA |
3371 | && (WSTOPSIG (w) == __SIGRTMIN |
3372 | || WSTOPSIG (w) == __SIGRTMIN + 1)) | |
3373 | || | |
3374 | #endif | |
c12a5089 | 3375 | (cs.pass_signals[gdb_signal_from_host (WSTOPSIG (w))] |
e471f25b | 3376 | && !(WSTOPSIG (w) == SIGSTOP |
c9587f88 AT |
3377 | && current_thread->last_resume_kind == resume_stop) |
3378 | && !linux_wstatus_maybe_breakpoint (w)))) | |
e471f25b PA |
3379 | { |
3380 | siginfo_t info, *info_p; | |
3381 | ||
3382 | if (debug_threads) | |
87ce2a04 | 3383 | debug_printf ("Ignored signal %d for LWP %ld.\n", |
0bfdf32f | 3384 | WSTOPSIG (w), lwpid_of (current_thread)); |
e471f25b | 3385 | |
0bfdf32f | 3386 | if (ptrace (PTRACE_GETSIGINFO, lwpid_of (current_thread), |
b8e1b30e | 3387 | (PTRACE_TYPE_ARG3) 0, &info) == 0) |
e471f25b PA |
3388 | info_p = &info; |
3389 | else | |
3390 | info_p = NULL; | |
863d01bd PA |
3391 | |
3392 | if (step_over_finished) | |
3393 | { | |
3394 | /* We cancelled this thread's step-over above. We still | |
3395 | need to unsuspend all other LWPs, and set them back | |
3396 | running again while the signal handler runs. */ | |
3397 | unsuspend_all_lwps (event_child); | |
3398 | ||
3399 | /* Enqueue the pending signal info so that proceed_all_lwps | |
3400 | doesn't lose it. */ | |
3401 | enqueue_pending_signal (event_child, WSTOPSIG (w), info_p); | |
3402 | ||
3403 | proceed_all_lwps (); | |
3404 | } | |
3405 | else | |
3406 | { | |
df95181f TBA |
3407 | resume_one_lwp (event_child, event_child->stepping, |
3408 | WSTOPSIG (w), info_p); | |
863d01bd | 3409 | } |
edeeb602 YQ |
3410 | |
3411 | if (debug_threads) | |
3412 | debug_exit (); | |
3413 | ||
582511be | 3414 | return ignore_event (ourstatus); |
e471f25b PA |
3415 | } |
3416 | ||
c2d6af84 PA |
3417 | /* Note that all addresses are always "out of the step range" when |
3418 | there's no range to begin with. */ | |
3419 | in_step_range = lwp_in_step_range (event_child); | |
3420 | ||
3421 | /* If GDB wanted this thread to single step, and the thread is out | |
3422 | of the step range, we always want to report the SIGTRAP, and let | |
3423 | GDB handle it. Watchpoints should always be reported. So should | |
3424 | signals we can't explain. A SIGTRAP we can't explain could be a | |
3425 | GDB breakpoint --- we may or not support Z0 breakpoints. If we | |
3426 | do, we're be able to handle GDB breakpoints on top of internal | |
3427 | breakpoints, by handling the internal breakpoint and still | |
3428 | reporting the event to GDB. If we don't, we're out of luck, GDB | |
863d01bd PA |
3429 | won't see the breakpoint hit. If we see a single-step event but |
3430 | the thread should be continuing, don't pass the trap to gdb. | |
3431 | That indicates that we had previously finished a single-step but | |
3432 | left the single-step pending -- see | |
3433 | complete_ongoing_step_over. */ | |
6bf5e0ba | 3434 | report_to_gdb = (!maybe_internal_trap |
0bfdf32f | 3435 | || (current_thread->last_resume_kind == resume_step |
c2d6af84 | 3436 | && !in_step_range) |
15c66dd6 | 3437 | || event_child->stop_reason == TARGET_STOPPED_BY_WATCHPOINT |
863d01bd PA |
3438 | || (!in_step_range |
3439 | && !bp_explains_trap | |
3440 | && !trace_event | |
3441 | && !step_over_finished | |
3442 | && !(current_thread->last_resume_kind == resume_continue | |
3443 | && event_child->stop_reason == TARGET_STOPPED_BY_SINGLE_STEP)) | |
9f3a5c85 | 3444 | || (gdb_breakpoint_here (event_child->stop_pc) |
d3ce09f5 | 3445 | && gdb_condition_true_at_breakpoint (event_child->stop_pc) |
de0d863e | 3446 | && gdb_no_commands_at_breakpoint (event_child->stop_pc)) |
00db26fa | 3447 | || event_child->waitstatus.kind != TARGET_WAITKIND_IGNORE); |
d3ce09f5 SS |
3448 | |
3449 | run_breakpoint_commands (event_child->stop_pc); | |
6bf5e0ba PA |
3450 | |
3451 | /* We found no reason GDB would want us to stop. We either hit one | |
3452 | of our own breakpoints, or finished an internal step GDB | |
3453 | shouldn't know about. */ | |
3454 | if (!report_to_gdb) | |
3455 | { | |
3456 | if (debug_threads) | |
3457 | { | |
3458 | if (bp_explains_trap) | |
87ce2a04 | 3459 | debug_printf ("Hit a gdbserver breakpoint.\n"); |
6bf5e0ba | 3460 | if (step_over_finished) |
87ce2a04 | 3461 | debug_printf ("Step-over finished.\n"); |
219f2f23 | 3462 | if (trace_event) |
87ce2a04 | 3463 | debug_printf ("Tracepoint event.\n"); |
c2d6af84 | 3464 | if (lwp_in_step_range (event_child)) |
87ce2a04 DE |
3465 | debug_printf ("Range stepping pc 0x%s [0x%s, 0x%s).\n", |
3466 | paddress (event_child->stop_pc), | |
3467 | paddress (event_child->step_range_start), | |
3468 | paddress (event_child->step_range_end)); | |
6bf5e0ba PA |
3469 | } |
3470 | ||
3471 | /* We're not reporting this breakpoint to GDB, so apply the | |
3472 | decr_pc_after_break adjustment to the inferior's regcache | |
3473 | ourselves. */ | |
3474 | ||
bf9ae9d8 | 3475 | if (low_supports_breakpoints ()) |
6bf5e0ba PA |
3476 | { |
3477 | struct regcache *regcache | |
0bfdf32f | 3478 | = get_thread_regcache (current_thread, 1); |
bf9ae9d8 | 3479 | low_set_pc (regcache, event_child->stop_pc); |
6bf5e0ba PA |
3480 | } |
3481 | ||
7984d532 | 3482 | if (step_over_finished) |
e3652c84 YQ |
3483 | { |
3484 | /* If we have finished stepping over a breakpoint, we've | |
3485 | stopped and suspended all LWPs momentarily except the | |
3486 | stepping one. This is where we resume them all again. | |
3487 | We're going to keep waiting, so use proceed, which | |
3488 | handles stepping over the next breakpoint. */ | |
3489 | unsuspend_all_lwps (event_child); | |
3490 | } | |
3491 | else | |
3492 | { | |
3493 | /* Remove the single-step breakpoints if any. Note that | |
3494 | there isn't single-step breakpoint if we finished stepping | |
3495 | over. */ | |
7582c77c | 3496 | if (supports_software_single_step () |
e3652c84 YQ |
3497 | && has_single_step_breakpoints (current_thread)) |
3498 | { | |
3499 | stop_all_lwps (0, event_child); | |
3500 | delete_single_step_breakpoints (current_thread); | |
3501 | unstop_all_lwps (0, event_child); | |
3502 | } | |
3503 | } | |
7984d532 | 3504 | |
e3652c84 YQ |
3505 | if (debug_threads) |
3506 | debug_printf ("proceeding all threads.\n"); | |
6bf5e0ba | 3507 | proceed_all_lwps (); |
edeeb602 YQ |
3508 | |
3509 | if (debug_threads) | |
3510 | debug_exit (); | |
3511 | ||
582511be | 3512 | return ignore_event (ourstatus); |
6bf5e0ba PA |
3513 | } |
3514 | ||
3515 | if (debug_threads) | |
3516 | { | |
00db26fa | 3517 | if (event_child->waitstatus.kind != TARGET_WAITKIND_IGNORE) |
ad071a30 | 3518 | { |
23fdd69e SM |
3519 | std::string str |
3520 | = target_waitstatus_to_string (&event_child->waitstatus); | |
ad071a30 | 3521 | |
ad071a30 | 3522 | debug_printf ("LWP %ld: extended event with waitstatus %s\n", |
23fdd69e | 3523 | lwpid_of (get_lwp_thread (event_child)), str.c_str ()); |
ad071a30 | 3524 | } |
0bfdf32f | 3525 | if (current_thread->last_resume_kind == resume_step) |
c2d6af84 PA |
3526 | { |
3527 | if (event_child->step_range_start == event_child->step_range_end) | |
87ce2a04 | 3528 | debug_printf ("GDB wanted to single-step, reporting event.\n"); |
c2d6af84 | 3529 | else if (!lwp_in_step_range (event_child)) |
87ce2a04 | 3530 | debug_printf ("Out of step range, reporting event.\n"); |
c2d6af84 | 3531 | } |
15c66dd6 | 3532 | if (event_child->stop_reason == TARGET_STOPPED_BY_WATCHPOINT) |
87ce2a04 | 3533 | debug_printf ("Stopped by watchpoint.\n"); |
582511be | 3534 | else if (gdb_breakpoint_here (event_child->stop_pc)) |
87ce2a04 | 3535 | debug_printf ("Stopped by GDB breakpoint.\n"); |
6bf5e0ba | 3536 | if (debug_threads) |
87ce2a04 | 3537 | debug_printf ("Hit a non-gdbserver trap event.\n"); |
6bf5e0ba PA |
3538 | } |
3539 | ||
3540 | /* Alright, we're going to report a stop. */ | |
3541 | ||
3b9a79ef | 3542 | /* Remove single-step breakpoints. */ |
7582c77c | 3543 | if (supports_software_single_step ()) |
8901d193 | 3544 | { |
3b9a79ef | 3545 | /* Remove single-step breakpoints or not. It it is true, stop all |
8901d193 YQ |
3546 | lwps, so that other threads won't hit the breakpoint in the |
3547 | staled memory. */ | |
3b9a79ef | 3548 | int remove_single_step_breakpoints_p = 0; |
8901d193 YQ |
3549 | |
3550 | if (non_stop) | |
3551 | { | |
3b9a79ef YQ |
3552 | remove_single_step_breakpoints_p |
3553 | = has_single_step_breakpoints (current_thread); | |
8901d193 YQ |
3554 | } |
3555 | else | |
3556 | { | |
3557 | /* In all-stop, a stop reply cancels all previous resume | |
3b9a79ef | 3558 | requests. Delete all single-step breakpoints. */ |
8901d193 | 3559 | |
9c80ecd6 SM |
3560 | find_thread ([&] (thread_info *thread) { |
3561 | if (has_single_step_breakpoints (thread)) | |
3562 | { | |
3563 | remove_single_step_breakpoints_p = 1; | |
3564 | return true; | |
3565 | } | |
8901d193 | 3566 | |
9c80ecd6 SM |
3567 | return false; |
3568 | }); | |
8901d193 YQ |
3569 | } |
3570 | ||
3b9a79ef | 3571 | if (remove_single_step_breakpoints_p) |
8901d193 | 3572 | { |
3b9a79ef | 3573 | /* If we remove single-step breakpoints from memory, stop all lwps, |
8901d193 YQ |
3574 | so that other threads won't hit the breakpoint in the staled |
3575 | memory. */ | |
3576 | stop_all_lwps (0, event_child); | |
3577 | ||
3578 | if (non_stop) | |
3579 | { | |
3b9a79ef YQ |
3580 | gdb_assert (has_single_step_breakpoints (current_thread)); |
3581 | delete_single_step_breakpoints (current_thread); | |
8901d193 YQ |
3582 | } |
3583 | else | |
3584 | { | |
9c80ecd6 SM |
3585 | for_each_thread ([] (thread_info *thread){ |
3586 | if (has_single_step_breakpoints (thread)) | |
3587 | delete_single_step_breakpoints (thread); | |
3588 | }); | |
8901d193 YQ |
3589 | } |
3590 | ||
3591 | unstop_all_lwps (0, event_child); | |
3592 | } | |
3593 | } | |
3594 | ||
582511be | 3595 | if (!stabilizing_threads) |
6bf5e0ba PA |
3596 | { |
3597 | /* In all-stop, stop all threads. */ | |
582511be PA |
3598 | if (!non_stop) |
3599 | stop_all_lwps (0, NULL); | |
6bf5e0ba | 3600 | |
c03e6ccc | 3601 | if (step_over_finished) |
582511be PA |
3602 | { |
3603 | if (!non_stop) | |
3604 | { | |
3605 | /* If we were doing a step-over, all other threads but | |
3606 | the stepping one had been paused in start_step_over, | |
3607 | with their suspend counts incremented. We don't want | |
3608 | to do a full unstop/unpause, because we're in | |
3609 | all-stop mode (so we want threads stopped), but we | |
3610 | still need to unsuspend the other threads, to | |
3611 | decrement their `suspended' count back. */ | |
3612 | unsuspend_all_lwps (event_child); | |
3613 | } | |
3614 | else | |
3615 | { | |
3616 | /* If we just finished a step-over, then all threads had | |
3617 | been momentarily paused. In all-stop, that's fine, | |
3618 | we want threads stopped by now anyway. In non-stop, | |
3619 | we need to re-resume threads that GDB wanted to be | |
3620 | running. */ | |
3621 | unstop_all_lwps (1, event_child); | |
3622 | } | |
3623 | } | |
c03e6ccc | 3624 | |
3aa5cfa0 AT |
3625 | /* If we're not waiting for a specific LWP, choose an event LWP |
3626 | from among those that have had events. Giving equal priority | |
3627 | to all LWPs that have had events helps prevent | |
3628 | starvation. */ | |
d7e15655 | 3629 | if (ptid == minus_one_ptid) |
3aa5cfa0 AT |
3630 | { |
3631 | event_child->status_pending_p = 1; | |
3632 | event_child->status_pending = w; | |
3633 | ||
3634 | select_event_lwp (&event_child); | |
3635 | ||
3636 | /* current_thread and event_child must stay in sync. */ | |
3637 | current_thread = get_lwp_thread (event_child); | |
3638 | ||
3639 | event_child->status_pending_p = 0; | |
3640 | w = event_child->status_pending; | |
3641 | } | |
3642 | ||
3643 | ||
fa593d66 | 3644 | /* Stabilize threads (move out of jump pads). */ |
582511be | 3645 | if (!non_stop) |
5c9eb2f2 | 3646 | target_stabilize_threads (); |
6bf5e0ba PA |
3647 | } |
3648 | else | |
3649 | { | |
3650 | /* If we just finished a step-over, then all threads had been | |
3651 | momentarily paused. In all-stop, that's fine, we want | |
3652 | threads stopped by now anyway. In non-stop, we need to | |
3653 | re-resume threads that GDB wanted to be running. */ | |
3654 | if (step_over_finished) | |
7984d532 | 3655 | unstop_all_lwps (1, event_child); |
6bf5e0ba PA |
3656 | } |
3657 | ||
00db26fa | 3658 | if (event_child->waitstatus.kind != TARGET_WAITKIND_IGNORE) |
de0d863e | 3659 | { |
00db26fa PA |
3660 | /* If the reported event is an exit, fork, vfork or exec, let |
3661 | GDB know. */ | |
5a04c4cf PA |
3662 | |
3663 | /* Break the unreported fork relationship chain. */ | |
3664 | if (event_child->waitstatus.kind == TARGET_WAITKIND_FORKED | |
3665 | || event_child->waitstatus.kind == TARGET_WAITKIND_VFORKED) | |
3666 | { | |
3667 | event_child->fork_relative->fork_relative = NULL; | |
3668 | event_child->fork_relative = NULL; | |
3669 | } | |
3670 | ||
00db26fa | 3671 | *ourstatus = event_child->waitstatus; |
de0d863e DB |
3672 | /* Clear the event lwp's waitstatus since we handled it already. */ |
3673 | event_child->waitstatus.kind = TARGET_WAITKIND_IGNORE; | |
3674 | } | |
3675 | else | |
3676 | ourstatus->kind = TARGET_WAITKIND_STOPPED; | |
5b1c542e | 3677 | |
582511be | 3678 | /* Now that we've selected our final event LWP, un-adjust its PC if |
3e572f71 PA |
3679 | it was a software breakpoint, and the client doesn't know we can |
3680 | adjust the breakpoint ourselves. */ | |
3681 | if (event_child->stop_reason == TARGET_STOPPED_BY_SW_BREAKPOINT | |
c12a5089 | 3682 | && !cs.swbreak_feature) |
582511be | 3683 | { |
d4807ea2 | 3684 | int decr_pc = low_decr_pc_after_break (); |
582511be PA |
3685 | |
3686 | if (decr_pc != 0) | |
3687 | { | |
3688 | struct regcache *regcache | |
3689 | = get_thread_regcache (current_thread, 1); | |
bf9ae9d8 | 3690 | low_set_pc (regcache, event_child->stop_pc + decr_pc); |
582511be PA |
3691 | } |
3692 | } | |
3693 | ||
82075af2 JS |
3694 | if (WSTOPSIG (w) == SYSCALL_SIGTRAP) |
3695 | { | |
82075af2 | 3696 | get_syscall_trapinfo (event_child, |
4cc32bec | 3697 | &ourstatus->value.syscall_number); |
82075af2 JS |
3698 | ourstatus->kind = event_child->syscall_state; |
3699 | } | |
3700 | else if (current_thread->last_resume_kind == resume_stop | |
3701 | && WSTOPSIG (w) == SIGSTOP) | |
bd99dc85 PA |
3702 | { |
3703 | /* A thread that has been requested to stop by GDB with vCont;t, | |
3704 | and it stopped cleanly, so report as SIG0. The use of | |
3705 | SIGSTOP is an implementation detail. */ | |
a493e3e2 | 3706 | ourstatus->value.sig = GDB_SIGNAL_0; |
bd99dc85 | 3707 | } |
0bfdf32f | 3708 | else if (current_thread->last_resume_kind == resume_stop |
8336d594 | 3709 | && WSTOPSIG (w) != SIGSTOP) |
bd99dc85 PA |
3710 | { |
3711 | /* A thread that has been requested to stop by GDB with vCont;t, | |
d50171e4 | 3712 | but, it stopped for other reasons. */ |
2ea28649 | 3713 | ourstatus->value.sig = gdb_signal_from_host (WSTOPSIG (w)); |
bd99dc85 | 3714 | } |
de0d863e | 3715 | else if (ourstatus->kind == TARGET_WAITKIND_STOPPED) |
bd99dc85 | 3716 | { |
2ea28649 | 3717 | ourstatus->value.sig = gdb_signal_from_host (WSTOPSIG (w)); |
bd99dc85 PA |
3718 | } |
3719 | ||
d7e15655 | 3720 | gdb_assert (step_over_bkpt == null_ptid); |
d50171e4 | 3721 | |
bd99dc85 | 3722 | if (debug_threads) |
87ce2a04 | 3723 | { |
d16f3f6c | 3724 | debug_printf ("wait_1 ret = %s, %d, %d\n", |
0bfdf32f | 3725 | target_pid_to_str (ptid_of (current_thread)), |
87ce2a04 DE |
3726 | ourstatus->kind, ourstatus->value.sig); |
3727 | debug_exit (); | |
3728 | } | |
bd99dc85 | 3729 | |
65706a29 PA |
3730 | if (ourstatus->kind == TARGET_WAITKIND_EXITED) |
3731 | return filter_exit_event (event_child, ourstatus); | |
3732 | ||
0bfdf32f | 3733 | return ptid_of (current_thread); |
bd99dc85 PA |
3734 | } |
3735 | ||
3736 | /* Get rid of any pending event in the pipe. */ | |
3737 | static void | |
3738 | async_file_flush (void) | |
3739 | { | |
3740 | int ret; | |
3741 | char buf; | |
3742 | ||
3743 | do | |
3744 | ret = read (linux_event_pipe[0], &buf, 1); | |
3745 | while (ret >= 0 || (ret == -1 && errno == EINTR)); | |
3746 | } | |
3747 | ||
3748 | /* Put something in the pipe, so the event loop wakes up. */ | |
3749 | static void | |
3750 | async_file_mark (void) | |
3751 | { | |
3752 | int ret; | |
3753 | ||
3754 | async_file_flush (); | |
3755 | ||
3756 | do | |
3757 | ret = write (linux_event_pipe[1], "+", 1); | |
3758 | while (ret == 0 || (ret == -1 && errno == EINTR)); | |
3759 | ||
3760 | /* Ignore EAGAIN. If the pipe is full, the event loop will already | |
3761 | be awakened anyway. */ | |
3762 | } | |
3763 | ||
6532e7e3 TBA |
3764 | ptid_t |
3765 | linux_process_target::wait (ptid_t ptid, | |
3766 | target_waitstatus *ourstatus, | |
3767 | int target_options) | |
bd99dc85 | 3768 | { |
95954743 | 3769 | ptid_t event_ptid; |
bd99dc85 | 3770 | |
bd99dc85 PA |
3771 | /* Flush the async file first. */ |
3772 | if (target_is_async_p ()) | |
3773 | async_file_flush (); | |
3774 | ||
582511be PA |
3775 | do |
3776 | { | |
d16f3f6c | 3777 | event_ptid = wait_1 (ptid, ourstatus, target_options); |
582511be PA |
3778 | } |
3779 | while ((target_options & TARGET_WNOHANG) == 0 | |
d7e15655 | 3780 | && event_ptid == null_ptid |
582511be | 3781 | && ourstatus->kind == TARGET_WAITKIND_IGNORE); |
bd99dc85 PA |
3782 | |
3783 | /* If at least one stop was reported, there may be more. A single | |
3784 | SIGCHLD can signal more than one child stop. */ | |
3785 | if (target_is_async_p () | |
3786 | && (target_options & TARGET_WNOHANG) != 0 | |
d7e15655 | 3787 | && event_ptid != null_ptid) |
bd99dc85 PA |
3788 | async_file_mark (); |
3789 | ||
3790 | return event_ptid; | |
da6d8c04 DJ |
3791 | } |
3792 | ||
c5f62d5f | 3793 | /* Send a signal to an LWP. */ |
fd500816 DJ |
3794 | |
3795 | static int | |
a1928bad | 3796 | kill_lwp (unsigned long lwpid, int signo) |
fd500816 | 3797 | { |
4a6ed09b | 3798 | int ret; |
fd500816 | 3799 | |
4a6ed09b PA |
3800 | errno = 0; |
3801 | ret = syscall (__NR_tkill, lwpid, signo); | |
3802 | if (errno == ENOSYS) | |
3803 | { | |
3804 | /* If tkill fails, then we are not using nptl threads, a | |
3805 | configuration we no longer support. */ | |
3806 | perror_with_name (("tkill")); | |
3807 | } | |
3808 | return ret; | |
fd500816 DJ |
3809 | } |
3810 | ||
964e4306 PA |
3811 | void |
3812 | linux_stop_lwp (struct lwp_info *lwp) | |
3813 | { | |
3814 | send_sigstop (lwp); | |
3815 | } | |
3816 | ||
0d62e5e8 | 3817 | static void |
02fc4de7 | 3818 | send_sigstop (struct lwp_info *lwp) |
0d62e5e8 | 3819 | { |
bd99dc85 | 3820 | int pid; |
0d62e5e8 | 3821 | |
d86d4aaf | 3822 | pid = lwpid_of (get_lwp_thread (lwp)); |
bd99dc85 | 3823 | |
0d62e5e8 DJ |
3824 | /* If we already have a pending stop signal for this process, don't |
3825 | send another. */ | |
54a0b537 | 3826 | if (lwp->stop_expected) |
0d62e5e8 | 3827 | { |
ae13219e | 3828 | if (debug_threads) |
87ce2a04 | 3829 | debug_printf ("Have pending sigstop for lwp %d\n", pid); |
ae13219e | 3830 | |
0d62e5e8 DJ |
3831 | return; |
3832 | } | |
3833 | ||
3834 | if (debug_threads) | |
87ce2a04 | 3835 | debug_printf ("Sending sigstop to lwp %d\n", pid); |
0d62e5e8 | 3836 | |
d50171e4 | 3837 | lwp->stop_expected = 1; |
bd99dc85 | 3838 | kill_lwp (pid, SIGSTOP); |
0d62e5e8 DJ |
3839 | } |
3840 | ||
df3e4dbe SM |
3841 | static void |
3842 | send_sigstop (thread_info *thread, lwp_info *except) | |
02fc4de7 | 3843 | { |
d86d4aaf | 3844 | struct lwp_info *lwp = get_thread_lwp (thread); |
02fc4de7 | 3845 | |
7984d532 PA |
3846 | /* Ignore EXCEPT. */ |
3847 | if (lwp == except) | |
df3e4dbe | 3848 | return; |
7984d532 | 3849 | |
02fc4de7 | 3850 | if (lwp->stopped) |
df3e4dbe | 3851 | return; |
02fc4de7 PA |
3852 | |
3853 | send_sigstop (lwp); | |
7984d532 PA |
3854 | } |
3855 | ||
3856 | /* Increment the suspend count of an LWP, and stop it, if not stopped | |
3857 | yet. */ | |
df3e4dbe SM |
3858 | static void |
3859 | suspend_and_send_sigstop (thread_info *thread, lwp_info *except) | |
7984d532 | 3860 | { |
d86d4aaf | 3861 | struct lwp_info *lwp = get_thread_lwp (thread); |
7984d532 PA |
3862 | |
3863 | /* Ignore EXCEPT. */ | |
3864 | if (lwp == except) | |
df3e4dbe | 3865 | return; |
7984d532 | 3866 | |
863d01bd | 3867 | lwp_suspended_inc (lwp); |
7984d532 | 3868 | |
df3e4dbe | 3869 | send_sigstop (thread, except); |
02fc4de7 PA |
3870 | } |
3871 | ||
95954743 PA |
3872 | static void |
3873 | mark_lwp_dead (struct lwp_info *lwp, int wstat) | |
3874 | { | |
95954743 PA |
3875 | /* Store the exit status for later. */ |
3876 | lwp->status_pending_p = 1; | |
3877 | lwp->status_pending = wstat; | |
3878 | ||
00db26fa PA |
3879 | /* Store in waitstatus as well, as there's nothing else to process |
3880 | for this event. */ | |
3881 | if (WIFEXITED (wstat)) | |
3882 | { | |
3883 | lwp->waitstatus.kind = TARGET_WAITKIND_EXITED; | |
3884 | lwp->waitstatus.value.integer = WEXITSTATUS (wstat); | |
3885 | } | |
3886 | else if (WIFSIGNALED (wstat)) | |
3887 | { | |
3888 | lwp->waitstatus.kind = TARGET_WAITKIND_SIGNALLED; | |
3889 | lwp->waitstatus.value.sig = gdb_signal_from_host (WTERMSIG (wstat)); | |
3890 | } | |
3891 | ||
95954743 PA |
3892 | /* Prevent trying to stop it. */ |
3893 | lwp->stopped = 1; | |
3894 | ||
3895 | /* No further stops are expected from a dead lwp. */ | |
3896 | lwp->stop_expected = 0; | |
3897 | } | |
3898 | ||
00db26fa PA |
3899 | /* Return true if LWP has exited already, and has a pending exit event |
3900 | to report to GDB. */ | |
3901 | ||
3902 | static int | |
3903 | lwp_is_marked_dead (struct lwp_info *lwp) | |
3904 | { | |
3905 | return (lwp->status_pending_p | |
3906 | && (WIFEXITED (lwp->status_pending) | |
3907 | || WIFSIGNALED (lwp->status_pending))); | |
3908 | } | |
3909 | ||
d16f3f6c TBA |
3910 | void |
3911 | linux_process_target::wait_for_sigstop () | |
0d62e5e8 | 3912 | { |
0bfdf32f | 3913 | struct thread_info *saved_thread; |
95954743 | 3914 | ptid_t saved_tid; |
fa96cb38 PA |
3915 | int wstat; |
3916 | int ret; | |
0d62e5e8 | 3917 | |
0bfdf32f GB |
3918 | saved_thread = current_thread; |
3919 | if (saved_thread != NULL) | |
9c80ecd6 | 3920 | saved_tid = saved_thread->id; |
bd99dc85 | 3921 | else |
95954743 | 3922 | saved_tid = null_ptid; /* avoid bogus unused warning */ |
bd99dc85 | 3923 | |
d50171e4 | 3924 | if (debug_threads) |
fa96cb38 | 3925 | debug_printf ("wait_for_sigstop: pulling events\n"); |
d50171e4 | 3926 | |
fa96cb38 PA |
3927 | /* Passing NULL_PTID as filter indicates we want all events to be |
3928 | left pending. Eventually this returns when there are no | |
3929 | unwaited-for children left. */ | |
d16f3f6c | 3930 | ret = wait_for_event_filtered (minus_one_ptid, null_ptid, &wstat, __WALL); |
fa96cb38 | 3931 | gdb_assert (ret == -1); |
0d62e5e8 | 3932 | |
13d3d99b | 3933 | if (saved_thread == NULL || mythread_alive (saved_tid)) |
0bfdf32f | 3934 | current_thread = saved_thread; |
0d62e5e8 DJ |
3935 | else |
3936 | { | |
3937 | if (debug_threads) | |
87ce2a04 | 3938 | debug_printf ("Previously current thread died.\n"); |
0d62e5e8 | 3939 | |
f0db101d PA |
3940 | /* We can't change the current inferior behind GDB's back, |
3941 | otherwise, a subsequent command may apply to the wrong | |
3942 | process. */ | |
3943 | current_thread = NULL; | |
0d62e5e8 DJ |
3944 | } |
3945 | } | |
3946 | ||
13e567af TBA |
3947 | bool |
3948 | linux_process_target::stuck_in_jump_pad (thread_info *thread) | |
fa593d66 | 3949 | { |
d86d4aaf | 3950 | struct lwp_info *lwp = get_thread_lwp (thread); |
fa593d66 | 3951 | |
863d01bd PA |
3952 | if (lwp->suspended != 0) |
3953 | { | |
3954 | internal_error (__FILE__, __LINE__, | |
3955 | "LWP %ld is suspended, suspended=%d\n", | |
3956 | lwpid_of (thread), lwp->suspended); | |
3957 | } | |
fa593d66 PA |
3958 | gdb_assert (lwp->stopped); |
3959 | ||
3960 | /* Allow debugging the jump pad, gdb_collect, etc.. */ | |
3961 | return (supports_fast_tracepoints () | |
58b4daa5 | 3962 | && agent_loaded_p () |
fa593d66 | 3963 | && (gdb_breakpoint_here (lwp->stop_pc) |
15c66dd6 | 3964 | || lwp->stop_reason == TARGET_STOPPED_BY_WATCHPOINT |
fa593d66 | 3965 | || thread->last_resume_kind == resume_step) |
229d26fc SM |
3966 | && (linux_fast_tracepoint_collecting (lwp, NULL) |
3967 | != fast_tpoint_collect_result::not_collecting)); | |
fa593d66 PA |
3968 | } |
3969 | ||
d16f3f6c TBA |
3970 | void |
3971 | linux_process_target::move_out_of_jump_pad (thread_info *thread) | |
fa593d66 | 3972 | { |
f0ce0d3a | 3973 | struct thread_info *saved_thread; |
d86d4aaf | 3974 | struct lwp_info *lwp = get_thread_lwp (thread); |
fa593d66 PA |
3975 | int *wstat; |
3976 | ||
863d01bd PA |
3977 | if (lwp->suspended != 0) |
3978 | { | |
3979 | internal_error (__FILE__, __LINE__, | |
3980 | "LWP %ld is suspended, suspended=%d\n", | |
3981 | lwpid_of (thread), lwp->suspended); | |
3982 | } | |
fa593d66 PA |
3983 | gdb_assert (lwp->stopped); |
3984 | ||
f0ce0d3a PA |
3985 | /* For gdb_breakpoint_here. */ |
3986 | saved_thread = current_thread; | |
3987 | current_thread = thread; | |
3988 | ||
fa593d66 PA |
3989 | wstat = lwp->status_pending_p ? &lwp->status_pending : NULL; |
3990 | ||
3991 | /* Allow debugging the jump pad, gdb_collect, etc. */ | |
3992 | if (!gdb_breakpoint_here (lwp->stop_pc) | |
15c66dd6 | 3993 | && lwp->stop_reason != TARGET_STOPPED_BY_WATCHPOINT |
fa593d66 PA |
3994 | && thread->last_resume_kind != resume_step |
3995 | && maybe_move_out_of_jump_pad (lwp, wstat)) | |
3996 | { | |
3997 | if (debug_threads) | |
87ce2a04 | 3998 | debug_printf ("LWP %ld needs stabilizing (in jump pad)\n", |
d86d4aaf | 3999 | lwpid_of (thread)); |
fa593d66 PA |
4000 | |
4001 | if (wstat) | |
4002 | { | |
4003 | lwp->status_pending_p = 0; | |
4004 | enqueue_one_deferred_signal (lwp, wstat); | |
4005 | ||
4006 | if (debug_threads) | |
87ce2a04 DE |
4007 | debug_printf ("Signal %d for LWP %ld deferred " |
4008 | "(in jump pad)\n", | |
d86d4aaf | 4009 | WSTOPSIG (*wstat), lwpid_of (thread)); |
fa593d66 PA |
4010 | } |
4011 | ||
df95181f | 4012 | resume_one_lwp (lwp, 0, 0, NULL); |
fa593d66 PA |
4013 | } |
4014 | else | |
863d01bd | 4015 | lwp_suspended_inc (lwp); |
f0ce0d3a PA |
4016 | |
4017 | current_thread = saved_thread; | |
fa593d66 PA |
4018 | } |
4019 | ||
5a6b0a41 SM |
4020 | static bool |
4021 | lwp_running (thread_info *thread) | |
fa593d66 | 4022 | { |
d86d4aaf | 4023 | struct lwp_info *lwp = get_thread_lwp (thread); |
fa593d66 | 4024 | |
00db26fa | 4025 | if (lwp_is_marked_dead (lwp)) |
5a6b0a41 SM |
4026 | return false; |
4027 | ||
4028 | return !lwp->stopped; | |
fa593d66 PA |
4029 | } |
4030 | ||
d16f3f6c TBA |
4031 | void |
4032 | linux_process_target::stop_all_lwps (int suspend, lwp_info *except) | |
0d62e5e8 | 4033 | { |
bde24c0a PA |
4034 | /* Should not be called recursively. */ |
4035 | gdb_assert (stopping_threads == NOT_STOPPING_THREADS); | |
4036 | ||
87ce2a04 DE |
4037 | if (debug_threads) |
4038 | { | |
4039 | debug_enter (); | |
4040 | debug_printf ("stop_all_lwps (%s, except=%s)\n", | |
4041 | suspend ? "stop-and-suspend" : "stop", | |
4042 | except != NULL | |
d86d4aaf | 4043 | ? target_pid_to_str (ptid_of (get_lwp_thread (except))) |
87ce2a04 DE |
4044 | : "none"); |
4045 | } | |
4046 | ||
bde24c0a PA |
4047 | stopping_threads = (suspend |
4048 | ? STOPPING_AND_SUSPENDING_THREADS | |
4049 | : STOPPING_THREADS); | |
7984d532 PA |
4050 | |
4051 | if (suspend) | |
df3e4dbe SM |
4052 | for_each_thread ([&] (thread_info *thread) |
4053 | { | |
4054 | suspend_and_send_sigstop (thread, except); | |
4055 | }); | |
7984d532 | 4056 | else |
df3e4dbe SM |
4057 | for_each_thread ([&] (thread_info *thread) |
4058 | { | |
4059 | send_sigstop (thread, except); | |
4060 | }); | |
4061 | ||
fa96cb38 | 4062 | wait_for_sigstop (); |
bde24c0a | 4063 | stopping_threads = NOT_STOPPING_THREADS; |
87ce2a04 DE |
4064 | |
4065 | if (debug_threads) | |
4066 | { | |
4067 | debug_printf ("stop_all_lwps done, setting stopping_threads " | |
4068 | "back to !stopping\n"); | |
4069 | debug_exit (); | |
4070 | } | |
0d62e5e8 DJ |
4071 | } |
4072 | ||
863d01bd PA |
4073 | /* Enqueue one signal in the chain of signals which need to be |
4074 | delivered to this process on next resume. */ | |
4075 | ||
4076 | static void | |
4077 | enqueue_pending_signal (struct lwp_info *lwp, int signal, siginfo_t *info) | |
4078 | { | |
8d749320 | 4079 | struct pending_signals *p_sig = XNEW (struct pending_signals); |
863d01bd | 4080 | |
863d01bd PA |
4081 | p_sig->prev = lwp->pending_signals; |
4082 | p_sig->signal = signal; | |
4083 | if (info == NULL) | |
4084 | memset (&p_sig->info, 0, sizeof (siginfo_t)); | |
4085 | else | |
4086 | memcpy (&p_sig->info, info, sizeof (siginfo_t)); | |
4087 | lwp->pending_signals = p_sig; | |
4088 | } | |
4089 | ||
df95181f TBA |
4090 | void |
4091 | linux_process_target::install_software_single_step_breakpoints (lwp_info *lwp) | |
fa5308bd | 4092 | { |
984a2c04 YQ |
4093 | struct thread_info *thread = get_lwp_thread (lwp); |
4094 | struct regcache *regcache = get_thread_regcache (thread, 1); | |
8ce47547 TT |
4095 | |
4096 | scoped_restore save_current_thread = make_scoped_restore (¤t_thread); | |
984a2c04 | 4097 | |
984a2c04 | 4098 | current_thread = thread; |
7582c77c | 4099 | std::vector<CORE_ADDR> next_pcs = low_get_next_pcs (regcache); |
fa5308bd | 4100 | |
a0ff9e1a | 4101 | for (CORE_ADDR pc : next_pcs) |
3b9a79ef | 4102 | set_single_step_breakpoint (pc, current_ptid); |
fa5308bd AT |
4103 | } |
4104 | ||
df95181f TBA |
4105 | int |
4106 | linux_process_target::single_step (lwp_info* lwp) | |
7fe5e27e AT |
4107 | { |
4108 | int step = 0; | |
4109 | ||
4110 | if (can_hardware_single_step ()) | |
4111 | { | |
4112 | step = 1; | |
4113 | } | |
7582c77c | 4114 | else if (supports_software_single_step ()) |
7fe5e27e AT |
4115 | { |
4116 | install_software_single_step_breakpoints (lwp); | |
4117 | step = 0; | |
4118 | } | |
4119 | else | |
4120 | { | |
4121 | if (debug_threads) | |
4122 | debug_printf ("stepping is not implemented on this target"); | |
4123 | } | |
4124 | ||
4125 | return step; | |
4126 | } | |
4127 | ||
35ac8b3e | 4128 | /* The signal can be delivered to the inferior if we are not trying to |
5b061e98 YQ |
4129 | finish a fast tracepoint collect. Since signal can be delivered in |
4130 | the step-over, the program may go to signal handler and trap again | |
4131 | after return from the signal handler. We can live with the spurious | |
4132 | double traps. */ | |
35ac8b3e YQ |
4133 | |
4134 | static int | |
4135 | lwp_signal_can_be_delivered (struct lwp_info *lwp) | |
4136 | { | |
229d26fc SM |
4137 | return (lwp->collecting_fast_tracepoint |
4138 | == fast_tpoint_collect_result::not_collecting); | |
35ac8b3e YQ |
4139 | } |
4140 | ||
df95181f TBA |
4141 | void |
4142 | linux_process_target::resume_one_lwp_throw (lwp_info *lwp, int step, | |
4143 | int signal, siginfo_t *info) | |
da6d8c04 | 4144 | { |
d86d4aaf | 4145 | struct thread_info *thread = get_lwp_thread (lwp); |
0bfdf32f | 4146 | struct thread_info *saved_thread; |
82075af2 | 4147 | int ptrace_request; |
c06cbd92 YQ |
4148 | struct process_info *proc = get_thread_process (thread); |
4149 | ||
4150 | /* Note that target description may not be initialised | |
4151 | (proc->tdesc == NULL) at this point because the program hasn't | |
4152 | stopped at the first instruction yet. It means GDBserver skips | |
4153 | the extra traps from the wrapper program (see option --wrapper). | |
4154 | Code in this function that requires register access should be | |
4155 | guarded by proc->tdesc == NULL or something else. */ | |
0d62e5e8 | 4156 | |
54a0b537 | 4157 | if (lwp->stopped == 0) |
0d62e5e8 DJ |
4158 | return; |
4159 | ||
65706a29 PA |
4160 | gdb_assert (lwp->waitstatus.kind == TARGET_WAITKIND_IGNORE); |
4161 | ||
229d26fc SM |
4162 | fast_tpoint_collect_result fast_tp_collecting |
4163 | = lwp->collecting_fast_tracepoint; | |
fa593d66 | 4164 | |
229d26fc SM |
4165 | gdb_assert (!stabilizing_threads |
4166 | || (fast_tp_collecting | |
4167 | != fast_tpoint_collect_result::not_collecting)); | |
fa593d66 | 4168 | |
219f2f23 PA |
4169 | /* Cancel actions that rely on GDB not changing the PC (e.g., the |
4170 | user used the "jump" command, or "set $pc = foo"). */ | |
c06cbd92 | 4171 | if (thread->while_stepping != NULL && lwp->stop_pc != get_pc (lwp)) |
219f2f23 PA |
4172 | { |
4173 | /* Collecting 'while-stepping' actions doesn't make sense | |
4174 | anymore. */ | |
d86d4aaf | 4175 | release_while_stepping_state_list (thread); |
219f2f23 PA |
4176 | } |
4177 | ||
0d62e5e8 | 4178 | /* If we have pending signals or status, and a new signal, enqueue the |
35ac8b3e YQ |
4179 | signal. Also enqueue the signal if it can't be delivered to the |
4180 | inferior right now. */ | |
0d62e5e8 | 4181 | if (signal != 0 |
fa593d66 PA |
4182 | && (lwp->status_pending_p |
4183 | || lwp->pending_signals != NULL | |
35ac8b3e | 4184 | || !lwp_signal_can_be_delivered (lwp))) |
94610ec4 YQ |
4185 | { |
4186 | enqueue_pending_signal (lwp, signal, info); | |
4187 | ||
4188 | /* Postpone any pending signal. It was enqueued above. */ | |
4189 | signal = 0; | |
4190 | } | |
0d62e5e8 | 4191 | |
d50171e4 PA |
4192 | if (lwp->status_pending_p) |
4193 | { | |
4194 | if (debug_threads) | |
94610ec4 | 4195 | debug_printf ("Not resuming lwp %ld (%s, stop %s);" |
87ce2a04 | 4196 | " has pending status\n", |
94610ec4 | 4197 | lwpid_of (thread), step ? "step" : "continue", |
87ce2a04 | 4198 | lwp->stop_expected ? "expected" : "not expected"); |
d50171e4 PA |
4199 | return; |
4200 | } | |
0d62e5e8 | 4201 | |
0bfdf32f GB |
4202 | saved_thread = current_thread; |
4203 | current_thread = thread; | |
0d62e5e8 | 4204 | |
0d62e5e8 DJ |
4205 | /* This bit needs some thinking about. If we get a signal that |
4206 | we must report while a single-step reinsert is still pending, | |
4207 | we often end up resuming the thread. It might be better to | |
4208 | (ew) allow a stack of pending events; then we could be sure that | |
4209 | the reinsert happened right away and not lose any signals. | |
4210 | ||
4211 | Making this stack would also shrink the window in which breakpoints are | |
54a0b537 | 4212 | uninserted (see comment in linux_wait_for_lwp) but not enough for |
0d62e5e8 DJ |
4213 | complete correctness, so it won't solve that problem. It may be |
4214 | worthwhile just to solve this one, however. */ | |
54a0b537 | 4215 | if (lwp->bp_reinsert != 0) |
0d62e5e8 DJ |
4216 | { |
4217 | if (debug_threads) | |
87ce2a04 DE |
4218 | debug_printf (" pending reinsert at 0x%s\n", |
4219 | paddress (lwp->bp_reinsert)); | |
d50171e4 | 4220 | |
85e00e85 | 4221 | if (can_hardware_single_step ()) |
d50171e4 | 4222 | { |
229d26fc | 4223 | if (fast_tp_collecting == fast_tpoint_collect_result::not_collecting) |
fa593d66 PA |
4224 | { |
4225 | if (step == 0) | |
9986ba08 | 4226 | warning ("BAD - reinserting but not stepping."); |
fa593d66 | 4227 | if (lwp->suspended) |
9986ba08 PA |
4228 | warning ("BAD - reinserting and suspended(%d).", |
4229 | lwp->suspended); | |
fa593d66 | 4230 | } |
d50171e4 | 4231 | } |
f79b145d YQ |
4232 | |
4233 | step = maybe_hw_step (thread); | |
0d62e5e8 DJ |
4234 | } |
4235 | ||
229d26fc | 4236 | if (fast_tp_collecting == fast_tpoint_collect_result::before_insn) |
fa593d66 PA |
4237 | { |
4238 | if (debug_threads) | |
87ce2a04 DE |
4239 | debug_printf ("lwp %ld wants to get out of fast tracepoint jump pad" |
4240 | " (exit-jump-pad-bkpt)\n", | |
d86d4aaf | 4241 | lwpid_of (thread)); |
fa593d66 | 4242 | } |
229d26fc | 4243 | else if (fast_tp_collecting == fast_tpoint_collect_result::at_insn) |
fa593d66 PA |
4244 | { |
4245 | if (debug_threads) | |
87ce2a04 DE |
4246 | debug_printf ("lwp %ld wants to get out of fast tracepoint jump pad" |
4247 | " single-stepping\n", | |
d86d4aaf | 4248 | lwpid_of (thread)); |
fa593d66 PA |
4249 | |
4250 | if (can_hardware_single_step ()) | |
4251 | step = 1; | |
4252 | else | |
38e08fca GB |
4253 | { |
4254 | internal_error (__FILE__, __LINE__, | |
4255 | "moving out of jump pad single-stepping" | |
4256 | " not implemented on this target"); | |
4257 | } | |
fa593d66 PA |
4258 | } |
4259 | ||
219f2f23 PA |
4260 | /* If we have while-stepping actions in this thread set it stepping. |
4261 | If we have a signal to deliver, it may or may not be set to | |
4262 | SIG_IGN, we don't know. Assume so, and allow collecting | |
4263 | while-stepping into a signal handler. A possible smart thing to | |
4264 | do would be to set an internal breakpoint at the signal return | |
4265 | address, continue, and carry on catching this while-stepping | |
4266 | action only when that breakpoint is hit. A future | |
4267 | enhancement. */ | |
7fe5e27e | 4268 | if (thread->while_stepping != NULL) |
219f2f23 PA |
4269 | { |
4270 | if (debug_threads) | |
87ce2a04 | 4271 | debug_printf ("lwp %ld has a while-stepping action -> forcing step.\n", |
d86d4aaf | 4272 | lwpid_of (thread)); |
7fe5e27e AT |
4273 | |
4274 | step = single_step (lwp); | |
219f2f23 PA |
4275 | } |
4276 | ||
bf9ae9d8 | 4277 | if (proc->tdesc != NULL && low_supports_breakpoints ()) |
0d62e5e8 | 4278 | { |
0bfdf32f | 4279 | struct regcache *regcache = get_thread_regcache (current_thread, 1); |
582511be | 4280 | |
bf9ae9d8 | 4281 | lwp->stop_pc = low_get_pc (regcache); |
582511be PA |
4282 | |
4283 | if (debug_threads) | |
4284 | { | |
4285 | debug_printf (" %s from pc 0x%lx\n", step ? "step" : "continue", | |
4286 | (long) lwp->stop_pc); | |
4287 | } | |
0d62e5e8 DJ |
4288 | } |
4289 | ||
35ac8b3e YQ |
4290 | /* If we have pending signals, consume one if it can be delivered to |
4291 | the inferior. */ | |
4292 | if (lwp->pending_signals != NULL && lwp_signal_can_be_delivered (lwp)) | |
0d62e5e8 DJ |
4293 | { |
4294 | struct pending_signals **p_sig; | |
4295 | ||
54a0b537 | 4296 | p_sig = &lwp->pending_signals; |
0d62e5e8 DJ |
4297 | while ((*p_sig)->prev != NULL) |
4298 | p_sig = &(*p_sig)->prev; | |
4299 | ||
4300 | signal = (*p_sig)->signal; | |
32ca6d61 | 4301 | if ((*p_sig)->info.si_signo != 0) |
d86d4aaf | 4302 | ptrace (PTRACE_SETSIGINFO, lwpid_of (thread), (PTRACE_TYPE_ARG3) 0, |
56f7af9c | 4303 | &(*p_sig)->info); |
32ca6d61 | 4304 | |
0d62e5e8 DJ |
4305 | free (*p_sig); |
4306 | *p_sig = NULL; | |
4307 | } | |
4308 | ||
94610ec4 YQ |
4309 | if (debug_threads) |
4310 | debug_printf ("Resuming lwp %ld (%s, signal %d, stop %s)\n", | |
4311 | lwpid_of (thread), step ? "step" : "continue", signal, | |
4312 | lwp->stop_expected ? "expected" : "not expected"); | |
4313 | ||
d7599cc0 | 4314 | low_prepare_to_resume (lwp); |
aa5ca48f | 4315 | |
d86d4aaf | 4316 | regcache_invalidate_thread (thread); |
da6d8c04 | 4317 | errno = 0; |
54a0b537 | 4318 | lwp->stepping = step; |
82075af2 JS |
4319 | if (step) |
4320 | ptrace_request = PTRACE_SINGLESTEP; | |
4321 | else if (gdb_catching_syscalls_p (lwp)) | |
4322 | ptrace_request = PTRACE_SYSCALL; | |
4323 | else | |
4324 | ptrace_request = PTRACE_CONT; | |
4325 | ptrace (ptrace_request, | |
4326 | lwpid_of (thread), | |
b8e1b30e | 4327 | (PTRACE_TYPE_ARG3) 0, |
14ce3065 DE |
4328 | /* Coerce to a uintptr_t first to avoid potential gcc warning |
4329 | of coercing an 8 byte integer to a 4 byte pointer. */ | |
b8e1b30e | 4330 | (PTRACE_TYPE_ARG4) (uintptr_t) signal); |
0d62e5e8 | 4331 | |
0bfdf32f | 4332 | current_thread = saved_thread; |
da6d8c04 | 4333 | if (errno) |
23f238d3 PA |
4334 | perror_with_name ("resuming thread"); |
4335 | ||
4336 | /* Successfully resumed. Clear state that no longer makes sense, | |
4337 | and mark the LWP as running. Must not do this before resuming | |
4338 | otherwise if that fails other code will be confused. E.g., we'd | |
4339 | later try to stop the LWP and hang forever waiting for a stop | |
4340 | status. Note that we must not throw after this is cleared, | |
4341 | otherwise handle_zombie_lwp_error would get confused. */ | |
4342 | lwp->stopped = 0; | |
4343 | lwp->stop_reason = TARGET_STOPPED_BY_NO_REASON; | |
4344 | } | |
4345 | ||
d7599cc0 TBA |
4346 | void |
4347 | linux_process_target::low_prepare_to_resume (lwp_info *lwp) | |
4348 | { | |
4349 | /* Nop. */ | |
4350 | } | |
4351 | ||
23f238d3 PA |
4352 | /* Called when we try to resume a stopped LWP and that errors out. If |
4353 | the LWP is no longer in ptrace-stopped state (meaning it's zombie, | |
4354 | or about to become), discard the error, clear any pending status | |
4355 | the LWP may have, and return true (we'll collect the exit status | |
4356 | soon enough). Otherwise, return false. */ | |
4357 | ||
4358 | static int | |
4359 | check_ptrace_stopped_lwp_gone (struct lwp_info *lp) | |
4360 | { | |
4361 | struct thread_info *thread = get_lwp_thread (lp); | |
4362 | ||
4363 | /* If we get an error after resuming the LWP successfully, we'd | |
4364 | confuse !T state for the LWP being gone. */ | |
4365 | gdb_assert (lp->stopped); | |
4366 | ||
4367 | /* We can't just check whether the LWP is in 'Z (Zombie)' state, | |
4368 | because even if ptrace failed with ESRCH, the tracee may be "not | |
4369 | yet fully dead", but already refusing ptrace requests. In that | |
4370 | case the tracee has 'R (Running)' state for a little bit | |
4371 | (observed in Linux 3.18). See also the note on ESRCH in the | |
4372 | ptrace(2) man page. Instead, check whether the LWP has any state | |
4373 | other than ptrace-stopped. */ | |
4374 | ||
4375 | /* Don't assume anything if /proc/PID/status can't be read. */ | |
4376 | if (linux_proc_pid_is_trace_stopped_nowarn (lwpid_of (thread)) == 0) | |
3221518c | 4377 | { |
23f238d3 PA |
4378 | lp->stop_reason = TARGET_STOPPED_BY_NO_REASON; |
4379 | lp->status_pending_p = 0; | |
4380 | return 1; | |
4381 | } | |
4382 | return 0; | |
4383 | } | |
4384 | ||
df95181f TBA |
4385 | void |
4386 | linux_process_target::resume_one_lwp (lwp_info *lwp, int step, int signal, | |
4387 | siginfo_t *info) | |
23f238d3 | 4388 | { |
a70b8144 | 4389 | try |
23f238d3 | 4390 | { |
df95181f | 4391 | resume_one_lwp_throw (lwp, step, signal, info); |
23f238d3 | 4392 | } |
230d2906 | 4393 | catch (const gdb_exception_error &ex) |
23f238d3 PA |
4394 | { |
4395 | if (!check_ptrace_stopped_lwp_gone (lwp)) | |
eedc3f4f | 4396 | throw; |
3221518c | 4397 | } |
da6d8c04 DJ |
4398 | } |
4399 | ||
5fdda392 SM |
4400 | /* This function is called once per thread via for_each_thread. |
4401 | We look up which resume request applies to THREAD and mark it with a | |
4402 | pointer to the appropriate resume request. | |
5544ad89 DJ |
4403 | |
4404 | This algorithm is O(threads * resume elements), but resume elements | |
4405 | is small (and will remain small at least until GDB supports thread | |
4406 | suspension). */ | |
ebcf782c | 4407 | |
5fdda392 SM |
4408 | static void |
4409 | linux_set_resume_request (thread_info *thread, thread_resume *resume, size_t n) | |
0d62e5e8 | 4410 | { |
d86d4aaf | 4411 | struct lwp_info *lwp = get_thread_lwp (thread); |
64386c31 | 4412 | |
5fdda392 | 4413 | for (int ndx = 0; ndx < n; ndx++) |
95954743 | 4414 | { |
5fdda392 | 4415 | ptid_t ptid = resume[ndx].thread; |
d7e15655 | 4416 | if (ptid == minus_one_ptid |
9c80ecd6 | 4417 | || ptid == thread->id |
0c9070b3 YQ |
4418 | /* Handle both 'pPID' and 'pPID.-1' as meaning 'all threads |
4419 | of PID'. */ | |
e99b03dc | 4420 | || (ptid.pid () == pid_of (thread) |
0e998d96 | 4421 | && (ptid.is_pid () |
e38504b3 | 4422 | || ptid.lwp () == -1))) |
95954743 | 4423 | { |
5fdda392 | 4424 | if (resume[ndx].kind == resume_stop |
8336d594 | 4425 | && thread->last_resume_kind == resume_stop) |
d50171e4 PA |
4426 | { |
4427 | if (debug_threads) | |
87ce2a04 DE |
4428 | debug_printf ("already %s LWP %ld at GDB's request\n", |
4429 | (thread->last_status.kind | |
4430 | == TARGET_WAITKIND_STOPPED) | |
4431 | ? "stopped" | |
4432 | : "stopping", | |
d86d4aaf | 4433 | lwpid_of (thread)); |
d50171e4 PA |
4434 | |
4435 | continue; | |
4436 | } | |
4437 | ||
5a04c4cf PA |
4438 | /* Ignore (wildcard) resume requests for already-resumed |
4439 | threads. */ | |
5fdda392 | 4440 | if (resume[ndx].kind != resume_stop |
5a04c4cf PA |
4441 | && thread->last_resume_kind != resume_stop) |
4442 | { | |
4443 | if (debug_threads) | |
4444 | debug_printf ("already %s LWP %ld at GDB's request\n", | |
4445 | (thread->last_resume_kind | |
4446 | == resume_step) | |
4447 | ? "stepping" | |
4448 | : "continuing", | |
4449 | lwpid_of (thread)); | |
4450 | continue; | |
4451 | } | |
4452 | ||
4453 | /* Don't let wildcard resumes resume fork children that GDB | |
4454 | does not yet know are new fork children. */ | |
4455 | if (lwp->fork_relative != NULL) | |
4456 | { | |
5a04c4cf PA |
4457 | struct lwp_info *rel = lwp->fork_relative; |
4458 | ||
4459 | if (rel->status_pending_p | |
4460 | && (rel->waitstatus.kind == TARGET_WAITKIND_FORKED | |
4461 | || rel->waitstatus.kind == TARGET_WAITKIND_VFORKED)) | |
4462 | { | |
4463 | if (debug_threads) | |
4464 | debug_printf ("not resuming LWP %ld: has queued stop reply\n", | |
4465 | lwpid_of (thread)); | |
4466 | continue; | |
4467 | } | |
4468 | } | |
4469 | ||
4470 | /* If the thread has a pending event that has already been | |
4471 | reported to GDBserver core, but GDB has not pulled the | |
4472 | event out of the vStopped queue yet, likewise, ignore the | |
4473 | (wildcard) resume request. */ | |
9c80ecd6 | 4474 | if (in_queued_stop_replies (thread->id)) |
5a04c4cf PA |
4475 | { |
4476 | if (debug_threads) | |
4477 | debug_printf ("not resuming LWP %ld: has queued stop reply\n", | |
4478 | lwpid_of (thread)); | |
4479 | continue; | |
4480 | } | |
4481 | ||
5fdda392 | 4482 | lwp->resume = &resume[ndx]; |
8336d594 | 4483 | thread->last_resume_kind = lwp->resume->kind; |
fa593d66 | 4484 | |
c2d6af84 PA |
4485 | lwp->step_range_start = lwp->resume->step_range_start; |
4486 | lwp->step_range_end = lwp->resume->step_range_end; | |
4487 | ||
fa593d66 PA |
4488 | /* If we had a deferred signal to report, dequeue one now. |
4489 | This can happen if LWP gets more than one signal while | |
4490 | trying to get out of a jump pad. */ | |
4491 | if (lwp->stopped | |
4492 | && !lwp->status_pending_p | |
4493 | && dequeue_one_deferred_signal (lwp, &lwp->status_pending)) | |
4494 | { | |
4495 | lwp->status_pending_p = 1; | |
4496 | ||
4497 | if (debug_threads) | |
87ce2a04 DE |
4498 | debug_printf ("Dequeueing deferred signal %d for LWP %ld, " |
4499 | "leaving status pending.\n", | |
d86d4aaf DE |
4500 | WSTOPSIG (lwp->status_pending), |
4501 | lwpid_of (thread)); | |
fa593d66 PA |
4502 | } |
4503 | ||
5fdda392 | 4504 | return; |
95954743 PA |
4505 | } |
4506 | } | |
2bd7c093 PA |
4507 | |
4508 | /* No resume action for this thread. */ | |
4509 | lwp->resume = NULL; | |
5544ad89 DJ |
4510 | } |
4511 | ||
df95181f TBA |
4512 | bool |
4513 | linux_process_target::resume_status_pending (thread_info *thread) | |
5544ad89 | 4514 | { |
d86d4aaf | 4515 | struct lwp_info *lwp = get_thread_lwp (thread); |
5544ad89 | 4516 | |
bd99dc85 PA |
4517 | /* LWPs which will not be resumed are not interesting, because |
4518 | we might not wait for them next time through linux_wait. */ | |
2bd7c093 | 4519 | if (lwp->resume == NULL) |
25c28b4d | 4520 | return false; |
64386c31 | 4521 | |
df95181f | 4522 | return thread_still_has_status_pending (thread); |
d50171e4 PA |
4523 | } |
4524 | ||
df95181f TBA |
4525 | bool |
4526 | linux_process_target::thread_needs_step_over (thread_info *thread) | |
d50171e4 | 4527 | { |
d86d4aaf | 4528 | struct lwp_info *lwp = get_thread_lwp (thread); |
0bfdf32f | 4529 | struct thread_info *saved_thread; |
d50171e4 | 4530 | CORE_ADDR pc; |
c06cbd92 YQ |
4531 | struct process_info *proc = get_thread_process (thread); |
4532 | ||
4533 | /* GDBserver is skipping the extra traps from the wrapper program, | |
4534 | don't have to do step over. */ | |
4535 | if (proc->tdesc == NULL) | |
eca55aec | 4536 | return false; |
d50171e4 PA |
4537 | |
4538 | /* LWPs which will not be resumed are not interesting, because we | |
4539 | might not wait for them next time through linux_wait. */ | |
4540 | ||
4541 | if (!lwp->stopped) | |
4542 | { | |
4543 | if (debug_threads) | |
87ce2a04 | 4544 | debug_printf ("Need step over [LWP %ld]? Ignoring, not stopped\n", |
d86d4aaf | 4545 | lwpid_of (thread)); |
eca55aec | 4546 | return false; |
d50171e4 PA |
4547 | } |
4548 | ||
8336d594 | 4549 | if (thread->last_resume_kind == resume_stop) |
d50171e4 PA |
4550 | { |
4551 | if (debug_threads) | |
87ce2a04 DE |
4552 | debug_printf ("Need step over [LWP %ld]? Ignoring, should remain" |
4553 | " stopped\n", | |
d86d4aaf | 4554 | lwpid_of (thread)); |
eca55aec | 4555 | return false; |
d50171e4 PA |
4556 | } |
4557 | ||
7984d532 PA |
4558 | gdb_assert (lwp->suspended >= 0); |
4559 | ||
4560 | if (lwp->suspended) | |
4561 | { | |
4562 | if (debug_threads) | |
87ce2a04 | 4563 | debug_printf ("Need step over [LWP %ld]? Ignoring, suspended\n", |
d86d4aaf | 4564 | lwpid_of (thread)); |
eca55aec | 4565 | return false; |
7984d532 PA |
4566 | } |
4567 | ||
bd99dc85 | 4568 | if (lwp->status_pending_p) |
d50171e4 PA |
4569 | { |
4570 | if (debug_threads) | |
87ce2a04 DE |
4571 | debug_printf ("Need step over [LWP %ld]? Ignoring, has pending" |
4572 | " status.\n", | |
d86d4aaf | 4573 | lwpid_of (thread)); |
eca55aec | 4574 | return false; |
d50171e4 PA |
4575 | } |
4576 | ||
4577 | /* Note: PC, not STOP_PC. Either GDB has adjusted the PC already, | |
4578 | or we have. */ | |
4579 | pc = get_pc (lwp); | |
4580 | ||
4581 | /* If the PC has changed since we stopped, then don't do anything, | |
4582 | and let the breakpoint/tracepoint be hit. This happens if, for | |
4583 | instance, GDB handled the decr_pc_after_break subtraction itself, | |
4584 | GDB is OOL stepping this thread, or the user has issued a "jump" | |
4585 | command, or poked thread's registers herself. */ | |
4586 | if (pc != lwp->stop_pc) | |
4587 | { | |
4588 | if (debug_threads) | |
87ce2a04 DE |
4589 | debug_printf ("Need step over [LWP %ld]? Cancelling, PC was changed. " |
4590 | "Old stop_pc was 0x%s, PC is now 0x%s\n", | |
d86d4aaf DE |
4591 | lwpid_of (thread), |
4592 | paddress (lwp->stop_pc), paddress (pc)); | |
eca55aec | 4593 | return false; |
d50171e4 PA |
4594 | } |
4595 | ||
484b3c32 YQ |
4596 | /* On software single step target, resume the inferior with signal |
4597 | rather than stepping over. */ | |
7582c77c | 4598 | if (supports_software_single_step () |
484b3c32 YQ |
4599 | && lwp->pending_signals != NULL |
4600 | && lwp_signal_can_be_delivered (lwp)) | |
4601 | { | |
4602 | if (debug_threads) | |
4603 | debug_printf ("Need step over [LWP %ld]? Ignoring, has pending" | |
4604 | " signals.\n", | |
4605 | lwpid_of (thread)); | |
4606 | ||
eca55aec | 4607 | return false; |
484b3c32 YQ |
4608 | } |
4609 | ||
0bfdf32f GB |
4610 | saved_thread = current_thread; |
4611 | current_thread = thread; | |
d50171e4 | 4612 | |
8b07ae33 | 4613 | /* We can only step over breakpoints we know about. */ |
fa593d66 | 4614 | if (breakpoint_here (pc) || fast_tracepoint_jump_here (pc)) |
d50171e4 | 4615 | { |
8b07ae33 | 4616 | /* Don't step over a breakpoint that GDB expects to hit |
9f3a5c85 LM |
4617 | though. If the condition is being evaluated on the target's side |
4618 | and it evaluate to false, step over this breakpoint as well. */ | |
4619 | if (gdb_breakpoint_here (pc) | |
d3ce09f5 SS |
4620 | && gdb_condition_true_at_breakpoint (pc) |
4621 | && gdb_no_commands_at_breakpoint (pc)) | |
8b07ae33 PA |
4622 | { |
4623 | if (debug_threads) | |
87ce2a04 DE |
4624 | debug_printf ("Need step over [LWP %ld]? yes, but found" |
4625 | " GDB breakpoint at 0x%s; skipping step over\n", | |
d86d4aaf | 4626 | lwpid_of (thread), paddress (pc)); |
d50171e4 | 4627 | |
0bfdf32f | 4628 | current_thread = saved_thread; |
eca55aec | 4629 | return false; |
8b07ae33 PA |
4630 | } |
4631 | else | |
4632 | { | |
4633 | if (debug_threads) | |
87ce2a04 DE |
4634 | debug_printf ("Need step over [LWP %ld]? yes, " |
4635 | "found breakpoint at 0x%s\n", | |
d86d4aaf | 4636 | lwpid_of (thread), paddress (pc)); |
d50171e4 | 4637 | |
8b07ae33 | 4638 | /* We've found an lwp that needs stepping over --- return 1 so |
8f86d7aa | 4639 | that find_thread stops looking. */ |
0bfdf32f | 4640 | current_thread = saved_thread; |
8b07ae33 | 4641 | |
eca55aec | 4642 | return true; |
8b07ae33 | 4643 | } |
d50171e4 PA |
4644 | } |
4645 | ||
0bfdf32f | 4646 | current_thread = saved_thread; |
d50171e4 PA |
4647 | |
4648 | if (debug_threads) | |
87ce2a04 DE |
4649 | debug_printf ("Need step over [LWP %ld]? No, no breakpoint found" |
4650 | " at 0x%s\n", | |
d86d4aaf | 4651 | lwpid_of (thread), paddress (pc)); |
c6ecbae5 | 4652 | |
eca55aec | 4653 | return false; |
5544ad89 DJ |
4654 | } |
4655 | ||
d16f3f6c TBA |
4656 | void |
4657 | linux_process_target::start_step_over (lwp_info *lwp) | |
d50171e4 | 4658 | { |
d86d4aaf | 4659 | struct thread_info *thread = get_lwp_thread (lwp); |
0bfdf32f | 4660 | struct thread_info *saved_thread; |
d50171e4 PA |
4661 | CORE_ADDR pc; |
4662 | int step; | |
4663 | ||
4664 | if (debug_threads) | |
87ce2a04 | 4665 | debug_printf ("Starting step-over on LWP %ld. Stopping all threads\n", |
d86d4aaf | 4666 | lwpid_of (thread)); |
d50171e4 | 4667 | |
7984d532 | 4668 | stop_all_lwps (1, lwp); |
863d01bd PA |
4669 | |
4670 | if (lwp->suspended != 0) | |
4671 | { | |
4672 | internal_error (__FILE__, __LINE__, | |
4673 | "LWP %ld suspended=%d\n", lwpid_of (thread), | |
4674 | lwp->suspended); | |
4675 | } | |
d50171e4 PA |
4676 | |
4677 | if (debug_threads) | |
87ce2a04 | 4678 | debug_printf ("Done stopping all threads for step-over.\n"); |
d50171e4 PA |
4679 | |
4680 | /* Note, we should always reach here with an already adjusted PC, | |
4681 | either by GDB (if we're resuming due to GDB's request), or by our | |
4682 | caller, if we just finished handling an internal breakpoint GDB | |
4683 | shouldn't care about. */ | |
4684 | pc = get_pc (lwp); | |
4685 | ||
0bfdf32f GB |
4686 | saved_thread = current_thread; |
4687 | current_thread = thread; | |
d50171e4 PA |
4688 | |
4689 | lwp->bp_reinsert = pc; | |
4690 | uninsert_breakpoints_at (pc); | |
fa593d66 | 4691 | uninsert_fast_tracepoint_jumps_at (pc); |
d50171e4 | 4692 | |
7fe5e27e | 4693 | step = single_step (lwp); |
d50171e4 | 4694 | |
0bfdf32f | 4695 | current_thread = saved_thread; |
d50171e4 | 4696 | |
df95181f | 4697 | resume_one_lwp (lwp, step, 0, NULL); |
d50171e4 PA |
4698 | |
4699 | /* Require next event from this LWP. */ | |
9c80ecd6 | 4700 | step_over_bkpt = thread->id; |
d50171e4 PA |
4701 | } |
4702 | ||
4703 | /* Finish a step-over. Reinsert the breakpoint we had uninserted in | |
3b9a79ef | 4704 | start_step_over, if still there, and delete any single-step |
d50171e4 PA |
4705 | breakpoints we've set, on non hardware single-step targets. */ |
4706 | ||
4707 | static int | |
4708 | finish_step_over (struct lwp_info *lwp) | |
4709 | { | |
4710 | if (lwp->bp_reinsert != 0) | |
4711 | { | |
f79b145d YQ |
4712 | struct thread_info *saved_thread = current_thread; |
4713 | ||
d50171e4 | 4714 | if (debug_threads) |
87ce2a04 | 4715 | debug_printf ("Finished step over.\n"); |
d50171e4 | 4716 | |
f79b145d YQ |
4717 | current_thread = get_lwp_thread (lwp); |
4718 | ||
d50171e4 PA |
4719 | /* Reinsert any breakpoint at LWP->BP_REINSERT. Note that there |
4720 | may be no breakpoint to reinsert there by now. */ | |
4721 | reinsert_breakpoints_at (lwp->bp_reinsert); | |
fa593d66 | 4722 | reinsert_fast_tracepoint_jumps_at (lwp->bp_reinsert); |
d50171e4 PA |
4723 | |
4724 | lwp->bp_reinsert = 0; | |
4725 | ||
3b9a79ef YQ |
4726 | /* Delete any single-step breakpoints. No longer needed. We |
4727 | don't have to worry about other threads hitting this trap, | |
4728 | and later not being able to explain it, because we were | |
4729 | stepping over a breakpoint, and we hold all threads but | |
4730 | LWP stopped while doing that. */ | |
d50171e4 | 4731 | if (!can_hardware_single_step ()) |
f79b145d | 4732 | { |
3b9a79ef YQ |
4733 | gdb_assert (has_single_step_breakpoints (current_thread)); |
4734 | delete_single_step_breakpoints (current_thread); | |
f79b145d | 4735 | } |
d50171e4 PA |
4736 | |
4737 | step_over_bkpt = null_ptid; | |
f79b145d | 4738 | current_thread = saved_thread; |
d50171e4 PA |
4739 | return 1; |
4740 | } | |
4741 | else | |
4742 | return 0; | |
4743 | } | |
4744 | ||
d16f3f6c TBA |
4745 | void |
4746 | linux_process_target::complete_ongoing_step_over () | |
863d01bd | 4747 | { |
d7e15655 | 4748 | if (step_over_bkpt != null_ptid) |
863d01bd PA |
4749 | { |
4750 | struct lwp_info *lwp; | |
4751 | int wstat; | |
4752 | int ret; | |
4753 | ||
4754 | if (debug_threads) | |
4755 | debug_printf ("detach: step over in progress, finish it first\n"); | |
4756 | ||
4757 | /* Passing NULL_PTID as filter indicates we want all events to | |
4758 | be left pending. Eventually this returns when there are no | |
4759 | unwaited-for children left. */ | |
d16f3f6c TBA |
4760 | ret = wait_for_event_filtered (minus_one_ptid, null_ptid, &wstat, |
4761 | __WALL); | |
863d01bd PA |
4762 | gdb_assert (ret == -1); |
4763 | ||
4764 | lwp = find_lwp_pid (step_over_bkpt); | |
4765 | if (lwp != NULL) | |
4766 | finish_step_over (lwp); | |
4767 | step_over_bkpt = null_ptid; | |
4768 | unsuspend_all_lwps (lwp); | |
4769 | } | |
4770 | } | |
4771 | ||
df95181f TBA |
4772 | void |
4773 | linux_process_target::resume_one_thread (thread_info *thread, | |
4774 | bool leave_all_stopped) | |
5544ad89 | 4775 | { |
d86d4aaf | 4776 | struct lwp_info *lwp = get_thread_lwp (thread); |
d50171e4 | 4777 | int leave_pending; |
5544ad89 | 4778 | |
2bd7c093 | 4779 | if (lwp->resume == NULL) |
c80825ff | 4780 | return; |
5544ad89 | 4781 | |
bd99dc85 | 4782 | if (lwp->resume->kind == resume_stop) |
5544ad89 | 4783 | { |
bd99dc85 | 4784 | if (debug_threads) |
d86d4aaf | 4785 | debug_printf ("resume_stop request for LWP %ld\n", lwpid_of (thread)); |
bd99dc85 PA |
4786 | |
4787 | if (!lwp->stopped) | |
4788 | { | |
4789 | if (debug_threads) | |
d86d4aaf | 4790 | debug_printf ("stopping LWP %ld\n", lwpid_of (thread)); |
bd99dc85 | 4791 | |
d50171e4 PA |
4792 | /* Stop the thread, and wait for the event asynchronously, |
4793 | through the event loop. */ | |
02fc4de7 | 4794 | send_sigstop (lwp); |
bd99dc85 PA |
4795 | } |
4796 | else | |
4797 | { | |
4798 | if (debug_threads) | |
87ce2a04 | 4799 | debug_printf ("already stopped LWP %ld\n", |
d86d4aaf | 4800 | lwpid_of (thread)); |
d50171e4 PA |
4801 | |
4802 | /* The LWP may have been stopped in an internal event that | |
4803 | was not meant to be notified back to GDB (e.g., gdbserver | |
4804 | breakpoint), so we should be reporting a stop event in | |
4805 | this case too. */ | |
4806 | ||
4807 | /* If the thread already has a pending SIGSTOP, this is a | |
4808 | no-op. Otherwise, something later will presumably resume | |
4809 | the thread and this will cause it to cancel any pending | |
4810 | operation, due to last_resume_kind == resume_stop. If | |
4811 | the thread already has a pending status to report, we | |
4812 | will still report it the next time we wait - see | |
4813 | status_pending_p_callback. */ | |
1a981360 PA |
4814 | |
4815 | /* If we already have a pending signal to report, then | |
4816 | there's no need to queue a SIGSTOP, as this means we're | |
4817 | midway through moving the LWP out of the jumppad, and we | |
4818 | will report the pending signal as soon as that is | |
4819 | finished. */ | |
4820 | if (lwp->pending_signals_to_report == NULL) | |
4821 | send_sigstop (lwp); | |
bd99dc85 | 4822 | } |
32ca6d61 | 4823 | |
bd99dc85 PA |
4824 | /* For stop requests, we're done. */ |
4825 | lwp->resume = NULL; | |
fc7238bb | 4826 | thread->last_status.kind = TARGET_WAITKIND_IGNORE; |
c80825ff | 4827 | return; |
5544ad89 DJ |
4828 | } |
4829 | ||
bd99dc85 | 4830 | /* If this thread which is about to be resumed has a pending status, |
863d01bd PA |
4831 | then don't resume it - we can just report the pending status. |
4832 | Likewise if it is suspended, because e.g., another thread is | |
4833 | stepping past a breakpoint. Make sure to queue any signals that | |
4834 | would otherwise be sent. In all-stop mode, we do this decision | |
4835 | based on if *any* thread has a pending status. If there's a | |
4836 | thread that needs the step-over-breakpoint dance, then don't | |
4837 | resume any other thread but that particular one. */ | |
4838 | leave_pending = (lwp->suspended | |
4839 | || lwp->status_pending_p | |
4840 | || leave_all_stopped); | |
5544ad89 | 4841 | |
0e9a339e YQ |
4842 | /* If we have a new signal, enqueue the signal. */ |
4843 | if (lwp->resume->sig != 0) | |
4844 | { | |
4845 | siginfo_t info, *info_p; | |
4846 | ||
4847 | /* If this is the same signal we were previously stopped by, | |
4848 | make sure to queue its siginfo. */ | |
4849 | if (WIFSTOPPED (lwp->last_status) | |
4850 | && WSTOPSIG (lwp->last_status) == lwp->resume->sig | |
4851 | && ptrace (PTRACE_GETSIGINFO, lwpid_of (thread), | |
4852 | (PTRACE_TYPE_ARG3) 0, &info) == 0) | |
4853 | info_p = &info; | |
4854 | else | |
4855 | info_p = NULL; | |
4856 | ||
4857 | enqueue_pending_signal (lwp, lwp->resume->sig, info_p); | |
4858 | } | |
4859 | ||
d50171e4 | 4860 | if (!leave_pending) |
bd99dc85 PA |
4861 | { |
4862 | if (debug_threads) | |
d86d4aaf | 4863 | debug_printf ("resuming LWP %ld\n", lwpid_of (thread)); |
5544ad89 | 4864 | |
9c80ecd6 | 4865 | proceed_one_lwp (thread, NULL); |
bd99dc85 PA |
4866 | } |
4867 | else | |
4868 | { | |
4869 | if (debug_threads) | |
d86d4aaf | 4870 | debug_printf ("leaving LWP %ld stopped\n", lwpid_of (thread)); |
bd99dc85 | 4871 | } |
5544ad89 | 4872 | |
fc7238bb | 4873 | thread->last_status.kind = TARGET_WAITKIND_IGNORE; |
bd99dc85 | 4874 | lwp->resume = NULL; |
0d62e5e8 DJ |
4875 | } |
4876 | ||
0e4d7e35 TBA |
4877 | void |
4878 | linux_process_target::resume (thread_resume *resume_info, size_t n) | |
0d62e5e8 | 4879 | { |
d86d4aaf | 4880 | struct thread_info *need_step_over = NULL; |
c6ecbae5 | 4881 | |
87ce2a04 DE |
4882 | if (debug_threads) |
4883 | { | |
4884 | debug_enter (); | |
4885 | debug_printf ("linux_resume:\n"); | |
4886 | } | |
4887 | ||
5fdda392 SM |
4888 | for_each_thread ([&] (thread_info *thread) |
4889 | { | |
4890 | linux_set_resume_request (thread, resume_info, n); | |
4891 | }); | |
5544ad89 | 4892 | |
d50171e4 PA |
4893 | /* If there is a thread which would otherwise be resumed, which has |
4894 | a pending status, then don't resume any threads - we can just | |
4895 | report the pending status. Make sure to queue any signals that | |
4896 | would otherwise be sent. In non-stop mode, we'll apply this | |
4897 | logic to each thread individually. We consume all pending events | |
4898 | before considering to start a step-over (in all-stop). */ | |
25c28b4d | 4899 | bool any_pending = false; |
bd99dc85 | 4900 | if (!non_stop) |
df95181f TBA |
4901 | any_pending = find_thread ([this] (thread_info *thread) |
4902 | { | |
4903 | return resume_status_pending (thread); | |
4904 | }) != nullptr; | |
d50171e4 PA |
4905 | |
4906 | /* If there is a thread which would otherwise be resumed, which is | |
4907 | stopped at a breakpoint that needs stepping over, then don't | |
4908 | resume any threads - have it step over the breakpoint with all | |
4909 | other threads stopped, then resume all threads again. Make sure | |
4910 | to queue any signals that would otherwise be delivered or | |
4911 | queued. */ | |
bf9ae9d8 | 4912 | if (!any_pending && low_supports_breakpoints ()) |
df95181f TBA |
4913 | need_step_over = find_thread ([this] (thread_info *thread) |
4914 | { | |
4915 | return thread_needs_step_over (thread); | |
4916 | }); | |
d50171e4 | 4917 | |
c80825ff | 4918 | bool leave_all_stopped = (need_step_over != NULL || any_pending); |
d50171e4 PA |
4919 | |
4920 | if (debug_threads) | |
4921 | { | |
4922 | if (need_step_over != NULL) | |
87ce2a04 | 4923 | debug_printf ("Not resuming all, need step over\n"); |
d50171e4 | 4924 | else if (any_pending) |
87ce2a04 DE |
4925 | debug_printf ("Not resuming, all-stop and found " |
4926 | "an LWP with pending status\n"); | |
d50171e4 | 4927 | else |
87ce2a04 | 4928 | debug_printf ("Resuming, no pending status or step over needed\n"); |
d50171e4 PA |
4929 | } |
4930 | ||
4931 | /* Even if we're leaving threads stopped, queue all signals we'd | |
4932 | otherwise deliver. */ | |
c80825ff SM |
4933 | for_each_thread ([&] (thread_info *thread) |
4934 | { | |
df95181f | 4935 | resume_one_thread (thread, leave_all_stopped); |
c80825ff | 4936 | }); |
d50171e4 PA |
4937 | |
4938 | if (need_step_over) | |
d86d4aaf | 4939 | start_step_over (get_thread_lwp (need_step_over)); |
87ce2a04 DE |
4940 | |
4941 | if (debug_threads) | |
4942 | { | |
4943 | debug_printf ("linux_resume done\n"); | |
4944 | debug_exit (); | |
4945 | } | |
1bebeeca PA |
4946 | |
4947 | /* We may have events that were pending that can/should be sent to | |
4948 | the client now. Trigger a linux_wait call. */ | |
4949 | if (target_is_async_p ()) | |
4950 | async_file_mark (); | |
d50171e4 PA |
4951 | } |
4952 | ||
df95181f TBA |
4953 | void |
4954 | linux_process_target::proceed_one_lwp (thread_info *thread, lwp_info *except) | |
d50171e4 | 4955 | { |
d86d4aaf | 4956 | struct lwp_info *lwp = get_thread_lwp (thread); |
d50171e4 PA |
4957 | int step; |
4958 | ||
7984d532 | 4959 | if (lwp == except) |
e2b44075 | 4960 | return; |
d50171e4 PA |
4961 | |
4962 | if (debug_threads) | |
d86d4aaf | 4963 | debug_printf ("proceed_one_lwp: lwp %ld\n", lwpid_of (thread)); |
d50171e4 PA |
4964 | |
4965 | if (!lwp->stopped) | |
4966 | { | |
4967 | if (debug_threads) | |
d86d4aaf | 4968 | debug_printf (" LWP %ld already running\n", lwpid_of (thread)); |
e2b44075 | 4969 | return; |
d50171e4 PA |
4970 | } |
4971 | ||
02fc4de7 PA |
4972 | if (thread->last_resume_kind == resume_stop |
4973 | && thread->last_status.kind != TARGET_WAITKIND_IGNORE) | |
d50171e4 PA |
4974 | { |
4975 | if (debug_threads) | |
87ce2a04 | 4976 | debug_printf (" client wants LWP to remain %ld stopped\n", |
d86d4aaf | 4977 | lwpid_of (thread)); |
e2b44075 | 4978 | return; |
d50171e4 PA |
4979 | } |
4980 | ||
4981 | if (lwp->status_pending_p) | |
4982 | { | |
4983 | if (debug_threads) | |
87ce2a04 | 4984 | debug_printf (" LWP %ld has pending status, leaving stopped\n", |
d86d4aaf | 4985 | lwpid_of (thread)); |
e2b44075 | 4986 | return; |
d50171e4 PA |
4987 | } |
4988 | ||
7984d532 PA |
4989 | gdb_assert (lwp->suspended >= 0); |
4990 | ||
d50171e4 PA |
4991 | if (lwp->suspended) |
4992 | { | |
4993 | if (debug_threads) | |
d86d4aaf | 4994 | debug_printf (" LWP %ld is suspended\n", lwpid_of (thread)); |
e2b44075 | 4995 | return; |
d50171e4 PA |
4996 | } |
4997 | ||
1a981360 PA |
4998 | if (thread->last_resume_kind == resume_stop |
4999 | && lwp->pending_signals_to_report == NULL | |
229d26fc SM |
5000 | && (lwp->collecting_fast_tracepoint |
5001 | == fast_tpoint_collect_result::not_collecting)) | |
02fc4de7 PA |
5002 | { |
5003 | /* We haven't reported this LWP as stopped yet (otherwise, the | |
5004 | last_status.kind check above would catch it, and we wouldn't | |
5005 | reach here. This LWP may have been momentarily paused by a | |
5006 | stop_all_lwps call while handling for example, another LWP's | |
5007 | step-over. In that case, the pending expected SIGSTOP signal | |
5008 | that was queued at vCont;t handling time will have already | |
5009 | been consumed by wait_for_sigstop, and so we need to requeue | |
5010 | another one here. Note that if the LWP already has a SIGSTOP | |
5011 | pending, this is a no-op. */ | |
5012 | ||
5013 | if (debug_threads) | |
87ce2a04 DE |
5014 | debug_printf ("Client wants LWP %ld to stop. " |
5015 | "Making sure it has a SIGSTOP pending\n", | |
d86d4aaf | 5016 | lwpid_of (thread)); |
02fc4de7 PA |
5017 | |
5018 | send_sigstop (lwp); | |
5019 | } | |
5020 | ||
863d01bd PA |
5021 | if (thread->last_resume_kind == resume_step) |
5022 | { | |
5023 | if (debug_threads) | |
5024 | debug_printf (" stepping LWP %ld, client wants it stepping\n", | |
5025 | lwpid_of (thread)); | |
8901d193 | 5026 | |
3b9a79ef | 5027 | /* If resume_step is requested by GDB, install single-step |
8901d193 | 5028 | breakpoints when the thread is about to be actually resumed if |
3b9a79ef | 5029 | the single-step breakpoints weren't removed. */ |
7582c77c | 5030 | if (supports_software_single_step () |
3b9a79ef | 5031 | && !has_single_step_breakpoints (thread)) |
8901d193 YQ |
5032 | install_software_single_step_breakpoints (lwp); |
5033 | ||
5034 | step = maybe_hw_step (thread); | |
863d01bd PA |
5035 | } |
5036 | else if (lwp->bp_reinsert != 0) | |
5037 | { | |
5038 | if (debug_threads) | |
5039 | debug_printf (" stepping LWP %ld, reinsert set\n", | |
5040 | lwpid_of (thread)); | |
f79b145d YQ |
5041 | |
5042 | step = maybe_hw_step (thread); | |
863d01bd PA |
5043 | } |
5044 | else | |
5045 | step = 0; | |
5046 | ||
df95181f | 5047 | resume_one_lwp (lwp, step, 0, NULL); |
7984d532 PA |
5048 | } |
5049 | ||
df95181f TBA |
5050 | void |
5051 | linux_process_target::unsuspend_and_proceed_one_lwp (thread_info *thread, | |
5052 | lwp_info *except) | |
7984d532 | 5053 | { |
d86d4aaf | 5054 | struct lwp_info *lwp = get_thread_lwp (thread); |
7984d532 PA |
5055 | |
5056 | if (lwp == except) | |
e2b44075 | 5057 | return; |
7984d532 | 5058 | |
863d01bd | 5059 | lwp_suspended_decr (lwp); |
7984d532 | 5060 | |
e2b44075 | 5061 | proceed_one_lwp (thread, except); |
d50171e4 PA |
5062 | } |
5063 | ||
d16f3f6c TBA |
5064 | void |
5065 | linux_process_target::proceed_all_lwps () | |
d50171e4 | 5066 | { |
d86d4aaf | 5067 | struct thread_info *need_step_over; |
d50171e4 PA |
5068 | |
5069 | /* If there is a thread which would otherwise be resumed, which is | |
5070 | stopped at a breakpoint that needs stepping over, then don't | |
5071 | resume any threads - have it step over the breakpoint with all | |
5072 | other threads stopped, then resume all threads again. */ | |
5073 | ||
bf9ae9d8 | 5074 | if (low_supports_breakpoints ()) |
d50171e4 | 5075 | { |
df95181f TBA |
5076 | need_step_over = find_thread ([this] (thread_info *thread) |
5077 | { | |
5078 | return thread_needs_step_over (thread); | |
5079 | }); | |
d50171e4 PA |
5080 | |
5081 | if (need_step_over != NULL) | |
5082 | { | |
5083 | if (debug_threads) | |
87ce2a04 DE |
5084 | debug_printf ("proceed_all_lwps: found " |
5085 | "thread %ld needing a step-over\n", | |
5086 | lwpid_of (need_step_over)); | |
d50171e4 | 5087 | |
d86d4aaf | 5088 | start_step_over (get_thread_lwp (need_step_over)); |
d50171e4 PA |
5089 | return; |
5090 | } | |
5091 | } | |
5544ad89 | 5092 | |
d50171e4 | 5093 | if (debug_threads) |
87ce2a04 | 5094 | debug_printf ("Proceeding, no step-over needed\n"); |
d50171e4 | 5095 | |
df95181f | 5096 | for_each_thread ([this] (thread_info *thread) |
e2b44075 SM |
5097 | { |
5098 | proceed_one_lwp (thread, NULL); | |
5099 | }); | |
d50171e4 PA |
5100 | } |
5101 | ||
d16f3f6c TBA |
5102 | void |
5103 | linux_process_target::unstop_all_lwps (int unsuspend, lwp_info *except) | |
d50171e4 | 5104 | { |
5544ad89 DJ |
5105 | if (debug_threads) |
5106 | { | |
87ce2a04 | 5107 | debug_enter (); |
d50171e4 | 5108 | if (except) |
87ce2a04 | 5109 | debug_printf ("unstopping all lwps, except=(LWP %ld)\n", |
d86d4aaf | 5110 | lwpid_of (get_lwp_thread (except))); |
5544ad89 | 5111 | else |
87ce2a04 | 5112 | debug_printf ("unstopping all lwps\n"); |
5544ad89 DJ |
5113 | } |
5114 | ||
7984d532 | 5115 | if (unsuspend) |
e2b44075 SM |
5116 | for_each_thread ([&] (thread_info *thread) |
5117 | { | |
5118 | unsuspend_and_proceed_one_lwp (thread, except); | |
5119 | }); | |
7984d532 | 5120 | else |
e2b44075 SM |
5121 | for_each_thread ([&] (thread_info *thread) |
5122 | { | |
5123 | proceed_one_lwp (thread, except); | |
5124 | }); | |
87ce2a04 DE |
5125 | |
5126 | if (debug_threads) | |
5127 | { | |
5128 | debug_printf ("unstop_all_lwps done\n"); | |
5129 | debug_exit (); | |
5130 | } | |
0d62e5e8 DJ |
5131 | } |
5132 | ||
58caa3dc DJ |
5133 | |
5134 | #ifdef HAVE_LINUX_REGSETS | |
5135 | ||
1faeff08 MR |
5136 | #define use_linux_regsets 1 |
5137 | ||
030031ee PA |
5138 | /* Returns true if REGSET has been disabled. */ |
5139 | ||
5140 | static int | |
5141 | regset_disabled (struct regsets_info *info, struct regset_info *regset) | |
5142 | { | |
5143 | return (info->disabled_regsets != NULL | |
5144 | && info->disabled_regsets[regset - info->regsets]); | |
5145 | } | |
5146 | ||
5147 | /* Disable REGSET. */ | |
5148 | ||
5149 | static void | |
5150 | disable_regset (struct regsets_info *info, struct regset_info *regset) | |
5151 | { | |
5152 | int dr_offset; | |
5153 | ||
5154 | dr_offset = regset - info->regsets; | |
5155 | if (info->disabled_regsets == NULL) | |
224c3ddb | 5156 | info->disabled_regsets = (char *) xcalloc (1, info->num_regsets); |
030031ee PA |
5157 | info->disabled_regsets[dr_offset] = 1; |
5158 | } | |
5159 | ||
58caa3dc | 5160 | static int |
3aee8918 PA |
5161 | regsets_fetch_inferior_registers (struct regsets_info *regsets_info, |
5162 | struct regcache *regcache) | |
58caa3dc DJ |
5163 | { |
5164 | struct regset_info *regset; | |
e9d25b98 | 5165 | int saw_general_regs = 0; |
95954743 | 5166 | int pid; |
1570b33e | 5167 | struct iovec iov; |
58caa3dc | 5168 | |
0bfdf32f | 5169 | pid = lwpid_of (current_thread); |
28eef672 | 5170 | for (regset = regsets_info->regsets; regset->size >= 0; regset++) |
58caa3dc | 5171 | { |
1570b33e L |
5172 | void *buf, *data; |
5173 | int nt_type, res; | |
58caa3dc | 5174 | |
030031ee | 5175 | if (regset->size == 0 || regset_disabled (regsets_info, regset)) |
28eef672 | 5176 | continue; |
58caa3dc | 5177 | |
bca929d3 | 5178 | buf = xmalloc (regset->size); |
1570b33e L |
5179 | |
5180 | nt_type = regset->nt_type; | |
5181 | if (nt_type) | |
5182 | { | |
5183 | iov.iov_base = buf; | |
5184 | iov.iov_len = regset->size; | |
5185 | data = (void *) &iov; | |
5186 | } | |
5187 | else | |
5188 | data = buf; | |
5189 | ||
dfb64f85 | 5190 | #ifndef __sparc__ |
f15f9948 | 5191 | res = ptrace (regset->get_request, pid, |
b8e1b30e | 5192 | (PTRACE_TYPE_ARG3) (long) nt_type, data); |
dfb64f85 | 5193 | #else |
1570b33e | 5194 | res = ptrace (regset->get_request, pid, data, nt_type); |
dfb64f85 | 5195 | #endif |
58caa3dc DJ |
5196 | if (res < 0) |
5197 | { | |
1ef53e6b AH |
5198 | if (errno == EIO |
5199 | || (errno == EINVAL && regset->type == OPTIONAL_REGS)) | |
58caa3dc | 5200 | { |
1ef53e6b AH |
5201 | /* If we get EIO on a regset, or an EINVAL and the regset is |
5202 | optional, do not try it again for this process mode. */ | |
030031ee | 5203 | disable_regset (regsets_info, regset); |
58caa3dc | 5204 | } |
e5a9158d AA |
5205 | else if (errno == ENODATA) |
5206 | { | |
5207 | /* ENODATA may be returned if the regset is currently | |
5208 | not "active". This can happen in normal operation, | |
5209 | so suppress the warning in this case. */ | |
5210 | } | |
fcd4a73d YQ |
5211 | else if (errno == ESRCH) |
5212 | { | |
5213 | /* At this point, ESRCH should mean the process is | |
5214 | already gone, in which case we simply ignore attempts | |
5215 | to read its registers. */ | |
5216 | } | |
58caa3dc DJ |
5217 | else |
5218 | { | |
0d62e5e8 | 5219 | char s[256]; |
95954743 PA |
5220 | sprintf (s, "ptrace(regsets_fetch_inferior_registers) PID=%d", |
5221 | pid); | |
0d62e5e8 | 5222 | perror (s); |
58caa3dc DJ |
5223 | } |
5224 | } | |
098dbe61 AA |
5225 | else |
5226 | { | |
5227 | if (regset->type == GENERAL_REGS) | |
5228 | saw_general_regs = 1; | |
5229 | regset->store_function (regcache, buf); | |
5230 | } | |
fdeb2a12 | 5231 | free (buf); |
58caa3dc | 5232 | } |
e9d25b98 DJ |
5233 | if (saw_general_regs) |
5234 | return 0; | |
5235 | else | |
5236 | return 1; | |
58caa3dc DJ |
5237 | } |
5238 | ||
5239 | static int | |
3aee8918 PA |
5240 | regsets_store_inferior_registers (struct regsets_info *regsets_info, |
5241 | struct regcache *regcache) | |
58caa3dc DJ |
5242 | { |
5243 | struct regset_info *regset; | |
e9d25b98 | 5244 | int saw_general_regs = 0; |
95954743 | 5245 | int pid; |
1570b33e | 5246 | struct iovec iov; |
58caa3dc | 5247 | |
0bfdf32f | 5248 | pid = lwpid_of (current_thread); |
28eef672 | 5249 | for (regset = regsets_info->regsets; regset->size >= 0; regset++) |
58caa3dc | 5250 | { |
1570b33e L |
5251 | void *buf, *data; |
5252 | int nt_type, res; | |
58caa3dc | 5253 | |
feea5f36 AA |
5254 | if (regset->size == 0 || regset_disabled (regsets_info, regset) |
5255 | || regset->fill_function == NULL) | |
28eef672 | 5256 | continue; |
58caa3dc | 5257 | |
bca929d3 | 5258 | buf = xmalloc (regset->size); |
545587ee DJ |
5259 | |
5260 | /* First fill the buffer with the current register set contents, | |
5261 | in case there are any items in the kernel's regset that are | |
5262 | not in gdbserver's regcache. */ | |
1570b33e L |
5263 | |
5264 | nt_type = regset->nt_type; | |
5265 | if (nt_type) | |
5266 | { | |
5267 | iov.iov_base = buf; | |
5268 | iov.iov_len = regset->size; | |
5269 | data = (void *) &iov; | |
5270 | } | |
5271 | else | |
5272 | data = buf; | |
5273 | ||
dfb64f85 | 5274 | #ifndef __sparc__ |
f15f9948 | 5275 | res = ptrace (regset->get_request, pid, |
b8e1b30e | 5276 | (PTRACE_TYPE_ARG3) (long) nt_type, data); |
dfb64f85 | 5277 | #else |
689cc2ae | 5278 | res = ptrace (regset->get_request, pid, data, nt_type); |
dfb64f85 | 5279 | #endif |
545587ee DJ |
5280 | |
5281 | if (res == 0) | |
5282 | { | |
5283 | /* Then overlay our cached registers on that. */ | |
442ea881 | 5284 | regset->fill_function (regcache, buf); |
545587ee DJ |
5285 | |
5286 | /* Only now do we write the register set. */ | |
dfb64f85 | 5287 | #ifndef __sparc__ |
f15f9948 | 5288 | res = ptrace (regset->set_request, pid, |
b8e1b30e | 5289 | (PTRACE_TYPE_ARG3) (long) nt_type, data); |
dfb64f85 | 5290 | #else |
1570b33e | 5291 | res = ptrace (regset->set_request, pid, data, nt_type); |
dfb64f85 | 5292 | #endif |
545587ee DJ |
5293 | } |
5294 | ||
58caa3dc DJ |
5295 | if (res < 0) |
5296 | { | |
1ef53e6b AH |
5297 | if (errno == EIO |
5298 | || (errno == EINVAL && regset->type == OPTIONAL_REGS)) | |
58caa3dc | 5299 | { |
1ef53e6b AH |
5300 | /* If we get EIO on a regset, or an EINVAL and the regset is |
5301 | optional, do not try it again for this process mode. */ | |
030031ee | 5302 | disable_regset (regsets_info, regset); |
58caa3dc | 5303 | } |
3221518c UW |
5304 | else if (errno == ESRCH) |
5305 | { | |
1b3f6016 PA |
5306 | /* At this point, ESRCH should mean the process is |
5307 | already gone, in which case we simply ignore attempts | |
5308 | to change its registers. See also the related | |
df95181f | 5309 | comment in resume_one_lwp. */ |
fdeb2a12 | 5310 | free (buf); |
3221518c UW |
5311 | return 0; |
5312 | } | |
58caa3dc DJ |
5313 | else |
5314 | { | |
ce3a066d | 5315 | perror ("Warning: ptrace(regsets_store_inferior_registers)"); |
58caa3dc DJ |
5316 | } |
5317 | } | |
e9d25b98 DJ |
5318 | else if (regset->type == GENERAL_REGS) |
5319 | saw_general_regs = 1; | |
09ec9b38 | 5320 | free (buf); |
58caa3dc | 5321 | } |
e9d25b98 DJ |
5322 | if (saw_general_regs) |
5323 | return 0; | |
5324 | else | |
5325 | return 1; | |
58caa3dc DJ |
5326 | } |
5327 | ||
1faeff08 | 5328 | #else /* !HAVE_LINUX_REGSETS */ |
58caa3dc | 5329 | |
1faeff08 | 5330 | #define use_linux_regsets 0 |
3aee8918 PA |
5331 | #define regsets_fetch_inferior_registers(regsets_info, regcache) 1 |
5332 | #define regsets_store_inferior_registers(regsets_info, regcache) 1 | |
58caa3dc | 5333 | |
58caa3dc | 5334 | #endif |
1faeff08 MR |
5335 | |
5336 | /* Return 1 if register REGNO is supported by one of the regset ptrace | |
5337 | calls or 0 if it has to be transferred individually. */ | |
5338 | ||
5339 | static int | |
3aee8918 | 5340 | linux_register_in_regsets (const struct regs_info *regs_info, int regno) |
1faeff08 MR |
5341 | { |
5342 | unsigned char mask = 1 << (regno % 8); | |
5343 | size_t index = regno / 8; | |
5344 | ||
5345 | return (use_linux_regsets | |
3aee8918 PA |
5346 | && (regs_info->regset_bitmap == NULL |
5347 | || (regs_info->regset_bitmap[index] & mask) != 0)); | |
1faeff08 MR |
5348 | } |
5349 | ||
58caa3dc | 5350 | #ifdef HAVE_LINUX_USRREGS |
1faeff08 | 5351 | |
5b3da067 | 5352 | static int |
3aee8918 | 5353 | register_addr (const struct usrregs_info *usrregs, int regnum) |
1faeff08 MR |
5354 | { |
5355 | int addr; | |
5356 | ||
3aee8918 | 5357 | if (regnum < 0 || regnum >= usrregs->num_regs) |
1faeff08 MR |
5358 | error ("Invalid register number %d.", regnum); |
5359 | ||
3aee8918 | 5360 | addr = usrregs->regmap[regnum]; |
1faeff08 MR |
5361 | |
5362 | return addr; | |
5363 | } | |
5364 | ||
daca57a7 TBA |
5365 | |
5366 | void | |
5367 | linux_process_target::fetch_register (const usrregs_info *usrregs, | |
5368 | regcache *regcache, int regno) | |
1faeff08 MR |
5369 | { |
5370 | CORE_ADDR regaddr; | |
5371 | int i, size; | |
5372 | char *buf; | |
5373 | int pid; | |
5374 | ||
3aee8918 | 5375 | if (regno >= usrregs->num_regs) |
1faeff08 | 5376 | return; |
daca57a7 | 5377 | if (low_cannot_fetch_register (regno)) |
1faeff08 MR |
5378 | return; |
5379 | ||
3aee8918 | 5380 | regaddr = register_addr (usrregs, regno); |
1faeff08 MR |
5381 | if (regaddr == -1) |
5382 | return; | |
5383 | ||
3aee8918 PA |
5384 | size = ((register_size (regcache->tdesc, regno) |
5385 | + sizeof (PTRACE_XFER_TYPE) - 1) | |
1faeff08 | 5386 | & -sizeof (PTRACE_XFER_TYPE)); |
224c3ddb | 5387 | buf = (char *) alloca (size); |
1faeff08 | 5388 | |
0bfdf32f | 5389 | pid = lwpid_of (current_thread); |
1faeff08 MR |
5390 | for (i = 0; i < size; i += sizeof (PTRACE_XFER_TYPE)) |
5391 | { | |
5392 | errno = 0; | |
5393 | *(PTRACE_XFER_TYPE *) (buf + i) = | |
5394 | ptrace (PTRACE_PEEKUSER, pid, | |
5395 | /* Coerce to a uintptr_t first to avoid potential gcc warning | |
5396 | of coercing an 8 byte integer to a 4 byte pointer. */ | |
b8e1b30e | 5397 | (PTRACE_TYPE_ARG3) (uintptr_t) regaddr, (PTRACE_TYPE_ARG4) 0); |
1faeff08 MR |
5398 | regaddr += sizeof (PTRACE_XFER_TYPE); |
5399 | if (errno != 0) | |
9a70f35c YQ |
5400 | { |
5401 | /* Mark register REGNO unavailable. */ | |
5402 | supply_register (regcache, regno, NULL); | |
5403 | return; | |
5404 | } | |
1faeff08 MR |
5405 | } |
5406 | ||
b35db733 | 5407 | low_supply_ptrace_register (regcache, regno, buf); |
1faeff08 MR |
5408 | } |
5409 | ||
daca57a7 TBA |
5410 | void |
5411 | linux_process_target::store_register (const usrregs_info *usrregs, | |
5412 | regcache *regcache, int regno) | |
1faeff08 MR |
5413 | { |
5414 | CORE_ADDR regaddr; | |
5415 | int i, size; | |
5416 | char *buf; | |
5417 | int pid; | |
5418 | ||
3aee8918 | 5419 | if (regno >= usrregs->num_regs) |
1faeff08 | 5420 | return; |
daca57a7 | 5421 | if (low_cannot_store_register (regno)) |
1faeff08 MR |
5422 | return; |
5423 | ||
3aee8918 | 5424 | regaddr = register_addr (usrregs, regno); |
1faeff08 MR |
5425 | if (regaddr == -1) |
5426 | return; | |
5427 | ||
3aee8918 PA |
5428 | size = ((register_size (regcache->tdesc, regno) |
5429 | + sizeof (PTRACE_XFER_TYPE) - 1) | |
1faeff08 | 5430 | & -sizeof (PTRACE_XFER_TYPE)); |
224c3ddb | 5431 | buf = (char *) alloca (size); |
1faeff08 MR |
5432 | memset (buf, 0, size); |
5433 | ||
b35db733 | 5434 | low_collect_ptrace_register (regcache, regno, buf); |
1faeff08 | 5435 | |
0bfdf32f | 5436 | pid = lwpid_of (current_thread); |
1faeff08 MR |
5437 | for (i = 0; i < size; i += sizeof (PTRACE_XFER_TYPE)) |
5438 | { | |
5439 | errno = 0; | |
5440 | ptrace (PTRACE_POKEUSER, pid, | |
5441 | /* Coerce to a uintptr_t first to avoid potential gcc warning | |
5442 | about coercing an 8 byte integer to a 4 byte pointer. */ | |
b8e1b30e LM |
5443 | (PTRACE_TYPE_ARG3) (uintptr_t) regaddr, |
5444 | (PTRACE_TYPE_ARG4) *(PTRACE_XFER_TYPE *) (buf + i)); | |
1faeff08 MR |
5445 | if (errno != 0) |
5446 | { | |
5447 | /* At this point, ESRCH should mean the process is | |
5448 | already gone, in which case we simply ignore attempts | |
5449 | to change its registers. See also the related | |
df95181f | 5450 | comment in resume_one_lwp. */ |
1faeff08 MR |
5451 | if (errno == ESRCH) |
5452 | return; | |
5453 | ||
daca57a7 TBA |
5454 | |
5455 | if (!low_cannot_store_register (regno)) | |
6d91ce9a | 5456 | error ("writing register %d: %s", regno, safe_strerror (errno)); |
1faeff08 MR |
5457 | } |
5458 | regaddr += sizeof (PTRACE_XFER_TYPE); | |
5459 | } | |
5460 | } | |
daca57a7 | 5461 | #endif /* HAVE_LINUX_USRREGS */ |
1faeff08 | 5462 | |
b35db733 TBA |
5463 | void |
5464 | linux_process_target::low_collect_ptrace_register (regcache *regcache, | |
5465 | int regno, char *buf) | |
5466 | { | |
5467 | collect_register (regcache, regno, buf); | |
5468 | } | |
5469 | ||
5470 | void | |
5471 | linux_process_target::low_supply_ptrace_register (regcache *regcache, | |
5472 | int regno, const char *buf) | |
5473 | { | |
5474 | supply_register (regcache, regno, buf); | |
5475 | } | |
5476 | ||
daca57a7 TBA |
5477 | void |
5478 | linux_process_target::usr_fetch_inferior_registers (const regs_info *regs_info, | |
5479 | regcache *regcache, | |
5480 | int regno, int all) | |
1faeff08 | 5481 | { |
daca57a7 | 5482 | #ifdef HAVE_LINUX_USRREGS |
3aee8918 PA |
5483 | struct usrregs_info *usr = regs_info->usrregs; |
5484 | ||
1faeff08 MR |
5485 | if (regno == -1) |
5486 | { | |
3aee8918 PA |
5487 | for (regno = 0; regno < usr->num_regs; regno++) |
5488 | if (all || !linux_register_in_regsets (regs_info, regno)) | |
5489 | fetch_register (usr, regcache, regno); | |
1faeff08 MR |
5490 | } |
5491 | else | |
3aee8918 | 5492 | fetch_register (usr, regcache, regno); |
daca57a7 | 5493 | #endif |
1faeff08 MR |
5494 | } |
5495 | ||
daca57a7 TBA |
5496 | void |
5497 | linux_process_target::usr_store_inferior_registers (const regs_info *regs_info, | |
5498 | regcache *regcache, | |
5499 | int regno, int all) | |
1faeff08 | 5500 | { |
daca57a7 | 5501 | #ifdef HAVE_LINUX_USRREGS |
3aee8918 PA |
5502 | struct usrregs_info *usr = regs_info->usrregs; |
5503 | ||
1faeff08 MR |
5504 | if (regno == -1) |
5505 | { | |
3aee8918 PA |
5506 | for (regno = 0; regno < usr->num_regs; regno++) |
5507 | if (all || !linux_register_in_regsets (regs_info, regno)) | |
5508 | store_register (usr, regcache, regno); | |
1faeff08 MR |
5509 | } |
5510 | else | |
3aee8918 | 5511 | store_register (usr, regcache, regno); |
58caa3dc | 5512 | #endif |
daca57a7 | 5513 | } |
1faeff08 | 5514 | |
a5a4d4cd TBA |
5515 | void |
5516 | linux_process_target::fetch_registers (regcache *regcache, int regno) | |
1faeff08 MR |
5517 | { |
5518 | int use_regsets; | |
5519 | int all = 0; | |
aa8d21c9 | 5520 | const regs_info *regs_info = get_regs_info (); |
1faeff08 MR |
5521 | |
5522 | if (regno == -1) | |
5523 | { | |
bd70b1f2 | 5524 | if (regs_info->usrregs != NULL) |
3aee8918 | 5525 | for (regno = 0; regno < regs_info->usrregs->num_regs; regno++) |
bd70b1f2 | 5526 | low_fetch_register (regcache, regno); |
c14dfd32 | 5527 | |
3aee8918 PA |
5528 | all = regsets_fetch_inferior_registers (regs_info->regsets_info, regcache); |
5529 | if (regs_info->usrregs != NULL) | |
5530 | usr_fetch_inferior_registers (regs_info, regcache, -1, all); | |
1faeff08 MR |
5531 | } |
5532 | else | |
5533 | { | |
bd70b1f2 | 5534 | if (low_fetch_register (regcache, regno)) |
c14dfd32 PA |
5535 | return; |
5536 | ||
3aee8918 | 5537 | use_regsets = linux_register_in_regsets (regs_info, regno); |
1faeff08 | 5538 | if (use_regsets) |
3aee8918 PA |
5539 | all = regsets_fetch_inferior_registers (regs_info->regsets_info, |
5540 | regcache); | |
5541 | if ((!use_regsets || all) && regs_info->usrregs != NULL) | |
5542 | usr_fetch_inferior_registers (regs_info, regcache, regno, 1); | |
1faeff08 | 5543 | } |
58caa3dc DJ |
5544 | } |
5545 | ||
a5a4d4cd TBA |
5546 | void |
5547 | linux_process_target::store_registers (regcache *regcache, int regno) | |
58caa3dc | 5548 | { |
1faeff08 MR |
5549 | int use_regsets; |
5550 | int all = 0; | |
aa8d21c9 | 5551 | const regs_info *regs_info = get_regs_info (); |
1faeff08 MR |
5552 | |
5553 | if (regno == -1) | |
5554 | { | |
3aee8918 PA |
5555 | all = regsets_store_inferior_registers (regs_info->regsets_info, |
5556 | regcache); | |
5557 | if (regs_info->usrregs != NULL) | |
5558 | usr_store_inferior_registers (regs_info, regcache, regno, all); | |
1faeff08 MR |
5559 | } |
5560 | else | |
5561 | { | |
3aee8918 | 5562 | use_regsets = linux_register_in_regsets (regs_info, regno); |
1faeff08 | 5563 | if (use_regsets) |
3aee8918 PA |
5564 | all = regsets_store_inferior_registers (regs_info->regsets_info, |
5565 | regcache); | |
5566 | if ((!use_regsets || all) && regs_info->usrregs != NULL) | |
5567 | usr_store_inferior_registers (regs_info, regcache, regno, 1); | |
1faeff08 | 5568 | } |
58caa3dc DJ |
5569 | } |
5570 | ||
bd70b1f2 TBA |
5571 | bool |
5572 | linux_process_target::low_fetch_register (regcache *regcache, int regno) | |
5573 | { | |
5574 | return false; | |
5575 | } | |
da6d8c04 | 5576 | |
e2558df3 | 5577 | /* A wrapper for the read_memory target op. */ |
da6d8c04 | 5578 | |
c3e735a6 | 5579 | static int |
f450004a | 5580 | linux_read_memory (CORE_ADDR memaddr, unsigned char *myaddr, int len) |
e2558df3 | 5581 | { |
52405d85 | 5582 | return the_target->read_memory (memaddr, myaddr, len); |
e2558df3 TBA |
5583 | } |
5584 | ||
5585 | /* Copy LEN bytes from inferior's memory starting at MEMADDR | |
5586 | to debugger memory starting at MYADDR. */ | |
5587 | ||
5588 | int | |
5589 | linux_process_target::read_memory (CORE_ADDR memaddr, | |
5590 | unsigned char *myaddr, int len) | |
da6d8c04 | 5591 | { |
0bfdf32f | 5592 | int pid = lwpid_of (current_thread); |
ae3e2ccf SM |
5593 | PTRACE_XFER_TYPE *buffer; |
5594 | CORE_ADDR addr; | |
5595 | int count; | |
4934b29e | 5596 | char filename[64]; |
ae3e2ccf | 5597 | int i; |
4934b29e | 5598 | int ret; |
fd462a61 | 5599 | int fd; |
fd462a61 DJ |
5600 | |
5601 | /* Try using /proc. Don't bother for one word. */ | |
5602 | if (len >= 3 * sizeof (long)) | |
5603 | { | |
4934b29e MR |
5604 | int bytes; |
5605 | ||
fd462a61 DJ |
5606 | /* We could keep this file open and cache it - possibly one per |
5607 | thread. That requires some juggling, but is even faster. */ | |
95954743 | 5608 | sprintf (filename, "/proc/%d/mem", pid); |
fd462a61 DJ |
5609 | fd = open (filename, O_RDONLY | O_LARGEFILE); |
5610 | if (fd == -1) | |
5611 | goto no_proc; | |
5612 | ||
5613 | /* If pread64 is available, use it. It's faster if the kernel | |
5614 | supports it (only one syscall), and it's 64-bit safe even on | |
5615 | 32-bit platforms (for instance, SPARC debugging a SPARC64 | |
5616 | application). */ | |
5617 | #ifdef HAVE_PREAD64 | |
4934b29e | 5618 | bytes = pread64 (fd, myaddr, len, memaddr); |
fd462a61 | 5619 | #else |
4934b29e MR |
5620 | bytes = -1; |
5621 | if (lseek (fd, memaddr, SEEK_SET) != -1) | |
5622 | bytes = read (fd, myaddr, len); | |
fd462a61 | 5623 | #endif |
fd462a61 DJ |
5624 | |
5625 | close (fd); | |
4934b29e MR |
5626 | if (bytes == len) |
5627 | return 0; | |
5628 | ||
5629 | /* Some data was read, we'll try to get the rest with ptrace. */ | |
5630 | if (bytes > 0) | |
5631 | { | |
5632 | memaddr += bytes; | |
5633 | myaddr += bytes; | |
5634 | len -= bytes; | |
5635 | } | |
fd462a61 | 5636 | } |
da6d8c04 | 5637 | |
fd462a61 | 5638 | no_proc: |
4934b29e MR |
5639 | /* Round starting address down to longword boundary. */ |
5640 | addr = memaddr & -(CORE_ADDR) sizeof (PTRACE_XFER_TYPE); | |
5641 | /* Round ending address up; get number of longwords that makes. */ | |
5642 | count = ((((memaddr + len) - addr) + sizeof (PTRACE_XFER_TYPE) - 1) | |
5643 | / sizeof (PTRACE_XFER_TYPE)); | |
5644 | /* Allocate buffer of that many longwords. */ | |
8d749320 | 5645 | buffer = XALLOCAVEC (PTRACE_XFER_TYPE, count); |
4934b29e | 5646 | |
da6d8c04 | 5647 | /* Read all the longwords */ |
4934b29e | 5648 | errno = 0; |
da6d8c04 DJ |
5649 | for (i = 0; i < count; i++, addr += sizeof (PTRACE_XFER_TYPE)) |
5650 | { | |
14ce3065 DE |
5651 | /* Coerce the 3rd arg to a uintptr_t first to avoid potential gcc warning |
5652 | about coercing an 8 byte integer to a 4 byte pointer. */ | |
5653 | buffer[i] = ptrace (PTRACE_PEEKTEXT, pid, | |
b8e1b30e LM |
5654 | (PTRACE_TYPE_ARG3) (uintptr_t) addr, |
5655 | (PTRACE_TYPE_ARG4) 0); | |
c3e735a6 | 5656 | if (errno) |
4934b29e | 5657 | break; |
da6d8c04 | 5658 | } |
4934b29e | 5659 | ret = errno; |
da6d8c04 DJ |
5660 | |
5661 | /* Copy appropriate bytes out of the buffer. */ | |
8d409d16 MR |
5662 | if (i > 0) |
5663 | { | |
5664 | i *= sizeof (PTRACE_XFER_TYPE); | |
5665 | i -= memaddr & (sizeof (PTRACE_XFER_TYPE) - 1); | |
5666 | memcpy (myaddr, | |
5667 | (char *) buffer + (memaddr & (sizeof (PTRACE_XFER_TYPE) - 1)), | |
5668 | i < len ? i : len); | |
5669 | } | |
c3e735a6 | 5670 | |
4934b29e | 5671 | return ret; |
da6d8c04 DJ |
5672 | } |
5673 | ||
93ae6fdc PA |
5674 | /* Copy LEN bytes of data from debugger memory at MYADDR to inferior's |
5675 | memory at MEMADDR. On failure (cannot write to the inferior) | |
f0ae6fc3 | 5676 | returns the value of errno. Always succeeds if LEN is zero. */ |
da6d8c04 | 5677 | |
e2558df3 TBA |
5678 | int |
5679 | linux_process_target::write_memory (CORE_ADDR memaddr, | |
5680 | const unsigned char *myaddr, int len) | |
da6d8c04 | 5681 | { |
ae3e2ccf | 5682 | int i; |
da6d8c04 | 5683 | /* Round starting address down to longword boundary. */ |
ae3e2ccf | 5684 | CORE_ADDR addr = memaddr & -(CORE_ADDR) sizeof (PTRACE_XFER_TYPE); |
da6d8c04 | 5685 | /* Round ending address up; get number of longwords that makes. */ |
ae3e2ccf | 5686 | int count |
493e2a69 MS |
5687 | = (((memaddr + len) - addr) + sizeof (PTRACE_XFER_TYPE) - 1) |
5688 | / sizeof (PTRACE_XFER_TYPE); | |
5689 | ||
da6d8c04 | 5690 | /* Allocate buffer of that many longwords. */ |
ae3e2ccf | 5691 | PTRACE_XFER_TYPE *buffer = XALLOCAVEC (PTRACE_XFER_TYPE, count); |
493e2a69 | 5692 | |
0bfdf32f | 5693 | int pid = lwpid_of (current_thread); |
da6d8c04 | 5694 | |
f0ae6fc3 PA |
5695 | if (len == 0) |
5696 | { | |
5697 | /* Zero length write always succeeds. */ | |
5698 | return 0; | |
5699 | } | |
5700 | ||
0d62e5e8 DJ |
5701 | if (debug_threads) |
5702 | { | |
58d6951d | 5703 | /* Dump up to four bytes. */ |
bf47e248 PA |
5704 | char str[4 * 2 + 1]; |
5705 | char *p = str; | |
5706 | int dump = len < 4 ? len : 4; | |
5707 | ||
5708 | for (i = 0; i < dump; i++) | |
5709 | { | |
5710 | sprintf (p, "%02x", myaddr[i]); | |
5711 | p += 2; | |
5712 | } | |
5713 | *p = '\0'; | |
5714 | ||
5715 | debug_printf ("Writing %s to 0x%08lx in process %d\n", | |
5716 | str, (long) memaddr, pid); | |
0d62e5e8 DJ |
5717 | } |
5718 | ||
da6d8c04 DJ |
5719 | /* Fill start and end extra bytes of buffer with existing memory data. */ |
5720 | ||
93ae6fdc | 5721 | errno = 0; |
14ce3065 DE |
5722 | /* Coerce the 3rd arg to a uintptr_t first to avoid potential gcc warning |
5723 | about coercing an 8 byte integer to a 4 byte pointer. */ | |
5724 | buffer[0] = ptrace (PTRACE_PEEKTEXT, pid, | |
b8e1b30e LM |
5725 | (PTRACE_TYPE_ARG3) (uintptr_t) addr, |
5726 | (PTRACE_TYPE_ARG4) 0); | |
93ae6fdc PA |
5727 | if (errno) |
5728 | return errno; | |
da6d8c04 DJ |
5729 | |
5730 | if (count > 1) | |
5731 | { | |
93ae6fdc | 5732 | errno = 0; |
da6d8c04 | 5733 | buffer[count - 1] |
95954743 | 5734 | = ptrace (PTRACE_PEEKTEXT, pid, |
14ce3065 DE |
5735 | /* Coerce to a uintptr_t first to avoid potential gcc warning |
5736 | about coercing an 8 byte integer to a 4 byte pointer. */ | |
b8e1b30e | 5737 | (PTRACE_TYPE_ARG3) (uintptr_t) (addr + (count - 1) |
14ce3065 | 5738 | * sizeof (PTRACE_XFER_TYPE)), |
b8e1b30e | 5739 | (PTRACE_TYPE_ARG4) 0); |
93ae6fdc PA |
5740 | if (errno) |
5741 | return errno; | |
da6d8c04 DJ |
5742 | } |
5743 | ||
93ae6fdc | 5744 | /* Copy data to be written over corresponding part of buffer. */ |
da6d8c04 | 5745 | |
493e2a69 MS |
5746 | memcpy ((char *) buffer + (memaddr & (sizeof (PTRACE_XFER_TYPE) - 1)), |
5747 | myaddr, len); | |
da6d8c04 DJ |
5748 | |
5749 | /* Write the entire buffer. */ | |
5750 | ||
5751 | for (i = 0; i < count; i++, addr += sizeof (PTRACE_XFER_TYPE)) | |
5752 | { | |
5753 | errno = 0; | |
14ce3065 DE |
5754 | ptrace (PTRACE_POKETEXT, pid, |
5755 | /* Coerce to a uintptr_t first to avoid potential gcc warning | |
5756 | about coercing an 8 byte integer to a 4 byte pointer. */ | |
b8e1b30e LM |
5757 | (PTRACE_TYPE_ARG3) (uintptr_t) addr, |
5758 | (PTRACE_TYPE_ARG4) buffer[i]); | |
da6d8c04 DJ |
5759 | if (errno) |
5760 | return errno; | |
5761 | } | |
5762 | ||
5763 | return 0; | |
5764 | } | |
2f2893d9 | 5765 | |
2a31c7aa TBA |
5766 | void |
5767 | linux_process_target::look_up_symbols () | |
2f2893d9 | 5768 | { |
0d62e5e8 | 5769 | #ifdef USE_THREAD_DB |
95954743 PA |
5770 | struct process_info *proc = current_process (); |
5771 | ||
fe978cb0 | 5772 | if (proc->priv->thread_db != NULL) |
0d62e5e8 DJ |
5773 | return; |
5774 | ||
9b4c5f87 | 5775 | thread_db_init (); |
0d62e5e8 DJ |
5776 | #endif |
5777 | } | |
5778 | ||
eb497a2a TBA |
5779 | void |
5780 | linux_process_target::request_interrupt () | |
e5379b03 | 5781 | { |
78708b7c PA |
5782 | /* Send a SIGINT to the process group. This acts just like the user |
5783 | typed a ^C on the controlling terminal. */ | |
eb497a2a | 5784 | ::kill (-signal_pid, SIGINT); |
e5379b03 DJ |
5785 | } |
5786 | ||
eac215cc TBA |
5787 | bool |
5788 | linux_process_target::supports_read_auxv () | |
5789 | { | |
5790 | return true; | |
5791 | } | |
5792 | ||
aa691b87 RM |
5793 | /* Copy LEN bytes from inferior's auxiliary vector starting at OFFSET |
5794 | to debugger memory starting at MYADDR. */ | |
5795 | ||
eac215cc TBA |
5796 | int |
5797 | linux_process_target::read_auxv (CORE_ADDR offset, unsigned char *myaddr, | |
5798 | unsigned int len) | |
aa691b87 RM |
5799 | { |
5800 | char filename[PATH_MAX]; | |
5801 | int fd, n; | |
0bfdf32f | 5802 | int pid = lwpid_of (current_thread); |
aa691b87 | 5803 | |
6cebaf6e | 5804 | xsnprintf (filename, sizeof filename, "/proc/%d/auxv", pid); |
aa691b87 RM |
5805 | |
5806 | fd = open (filename, O_RDONLY); | |
5807 | if (fd < 0) | |
5808 | return -1; | |
5809 | ||
5810 | if (offset != (CORE_ADDR) 0 | |
5811 | && lseek (fd, (off_t) offset, SEEK_SET) != (off_t) offset) | |
5812 | n = -1; | |
5813 | else | |
5814 | n = read (fd, myaddr, len); | |
5815 | ||
5816 | close (fd); | |
5817 | ||
5818 | return n; | |
5819 | } | |
5820 | ||
7e0bde70 TBA |
5821 | int |
5822 | linux_process_target::insert_point (enum raw_bkpt_type type, CORE_ADDR addr, | |
5823 | int size, raw_breakpoint *bp) | |
e013ee27 | 5824 | { |
c8f4bfdd YQ |
5825 | if (type == raw_bkpt_type_sw) |
5826 | return insert_memory_breakpoint (bp); | |
e013ee27 | 5827 | else |
9db9aa23 TBA |
5828 | return low_insert_point (type, addr, size, bp); |
5829 | } | |
5830 | ||
5831 | int | |
5832 | linux_process_target::low_insert_point (raw_bkpt_type type, CORE_ADDR addr, | |
5833 | int size, raw_breakpoint *bp) | |
5834 | { | |
5835 | /* Unsupported (see target.h). */ | |
5836 | return 1; | |
e013ee27 OF |
5837 | } |
5838 | ||
7e0bde70 TBA |
5839 | int |
5840 | linux_process_target::remove_point (enum raw_bkpt_type type, CORE_ADDR addr, | |
5841 | int size, raw_breakpoint *bp) | |
e013ee27 | 5842 | { |
c8f4bfdd YQ |
5843 | if (type == raw_bkpt_type_sw) |
5844 | return remove_memory_breakpoint (bp); | |
e013ee27 | 5845 | else |
9db9aa23 TBA |
5846 | return low_remove_point (type, addr, size, bp); |
5847 | } | |
5848 | ||
5849 | int | |
5850 | linux_process_target::low_remove_point (raw_bkpt_type type, CORE_ADDR addr, | |
5851 | int size, raw_breakpoint *bp) | |
5852 | { | |
5853 | /* Unsupported (see target.h). */ | |
5854 | return 1; | |
e013ee27 OF |
5855 | } |
5856 | ||
84320c4e | 5857 | /* Implement the stopped_by_sw_breakpoint target_ops |
3e572f71 PA |
5858 | method. */ |
5859 | ||
84320c4e TBA |
5860 | bool |
5861 | linux_process_target::stopped_by_sw_breakpoint () | |
3e572f71 PA |
5862 | { |
5863 | struct lwp_info *lwp = get_thread_lwp (current_thread); | |
5864 | ||
5865 | return (lwp->stop_reason == TARGET_STOPPED_BY_SW_BREAKPOINT); | |
5866 | } | |
5867 | ||
84320c4e | 5868 | /* Implement the supports_stopped_by_sw_breakpoint target_ops |
3e572f71 PA |
5869 | method. */ |
5870 | ||
84320c4e TBA |
5871 | bool |
5872 | linux_process_target::supports_stopped_by_sw_breakpoint () | |
3e572f71 PA |
5873 | { |
5874 | return USE_SIGTRAP_SIGINFO; | |
5875 | } | |
5876 | ||
93fe88b2 | 5877 | /* Implement the stopped_by_hw_breakpoint target_ops |
3e572f71 PA |
5878 | method. */ |
5879 | ||
93fe88b2 TBA |
5880 | bool |
5881 | linux_process_target::stopped_by_hw_breakpoint () | |
3e572f71 PA |
5882 | { |
5883 | struct lwp_info *lwp = get_thread_lwp (current_thread); | |
5884 | ||
5885 | return (lwp->stop_reason == TARGET_STOPPED_BY_HW_BREAKPOINT); | |
5886 | } | |
5887 | ||
93fe88b2 | 5888 | /* Implement the supports_stopped_by_hw_breakpoint target_ops |
3e572f71 PA |
5889 | method. */ |
5890 | ||
93fe88b2 TBA |
5891 | bool |
5892 | linux_process_target::supports_stopped_by_hw_breakpoint () | |
3e572f71 PA |
5893 | { |
5894 | return USE_SIGTRAP_SIGINFO; | |
5895 | } | |
5896 | ||
70b90b91 | 5897 | /* Implement the supports_hardware_single_step target_ops method. */ |
45614f15 | 5898 | |
22aa6223 TBA |
5899 | bool |
5900 | linux_process_target::supports_hardware_single_step () | |
45614f15 | 5901 | { |
45614f15 YQ |
5902 | return can_hardware_single_step (); |
5903 | } | |
5904 | ||
6eeb5c55 TBA |
5905 | bool |
5906 | linux_process_target::stopped_by_watchpoint () | |
e013ee27 | 5907 | { |
0bfdf32f | 5908 | struct lwp_info *lwp = get_thread_lwp (current_thread); |
c3adc08c | 5909 | |
15c66dd6 | 5910 | return lwp->stop_reason == TARGET_STOPPED_BY_WATCHPOINT; |
e013ee27 OF |
5911 | } |
5912 | ||
6eeb5c55 TBA |
5913 | CORE_ADDR |
5914 | linux_process_target::stopped_data_address () | |
e013ee27 | 5915 | { |
0bfdf32f | 5916 | struct lwp_info *lwp = get_thread_lwp (current_thread); |
c3adc08c PA |
5917 | |
5918 | return lwp->stopped_data_address; | |
e013ee27 OF |
5919 | } |
5920 | ||
db0dfaa0 LM |
5921 | /* This is only used for targets that define PT_TEXT_ADDR, |
5922 | PT_DATA_ADDR and PT_TEXT_END_ADDR. If those are not defined, supposedly | |
5923 | the target has different ways of acquiring this information, like | |
5924 | loadmaps. */ | |
52fb6437 | 5925 | |
5203ae1e TBA |
5926 | bool |
5927 | linux_process_target::supports_read_offsets () | |
5928 | { | |
5929 | #ifdef SUPPORTS_READ_OFFSETS | |
5930 | return true; | |
5931 | #else | |
5932 | return false; | |
5933 | #endif | |
5934 | } | |
5935 | ||
52fb6437 NS |
5936 | /* Under uClinux, programs are loaded at non-zero offsets, which we need |
5937 | to tell gdb about. */ | |
5938 | ||
5203ae1e TBA |
5939 | int |
5940 | linux_process_target::read_offsets (CORE_ADDR *text_p, CORE_ADDR *data_p) | |
52fb6437 | 5941 | { |
5203ae1e | 5942 | #ifdef SUPPORTS_READ_OFFSETS |
52fb6437 | 5943 | unsigned long text, text_end, data; |
62828379 | 5944 | int pid = lwpid_of (current_thread); |
52fb6437 NS |
5945 | |
5946 | errno = 0; | |
5947 | ||
b8e1b30e LM |
5948 | text = ptrace (PTRACE_PEEKUSER, pid, (PTRACE_TYPE_ARG3) PT_TEXT_ADDR, |
5949 | (PTRACE_TYPE_ARG4) 0); | |
5950 | text_end = ptrace (PTRACE_PEEKUSER, pid, (PTRACE_TYPE_ARG3) PT_TEXT_END_ADDR, | |
5951 | (PTRACE_TYPE_ARG4) 0); | |
5952 | data = ptrace (PTRACE_PEEKUSER, pid, (PTRACE_TYPE_ARG3) PT_DATA_ADDR, | |
5953 | (PTRACE_TYPE_ARG4) 0); | |
52fb6437 NS |
5954 | |
5955 | if (errno == 0) | |
5956 | { | |
5957 | /* Both text and data offsets produced at compile-time (and so | |
1b3f6016 PA |
5958 | used by gdb) are relative to the beginning of the program, |
5959 | with the data segment immediately following the text segment. | |
5960 | However, the actual runtime layout in memory may put the data | |
5961 | somewhere else, so when we send gdb a data base-address, we | |
5962 | use the real data base address and subtract the compile-time | |
5963 | data base-address from it (which is just the length of the | |
5964 | text segment). BSS immediately follows data in both | |
5965 | cases. */ | |
52fb6437 NS |
5966 | *text_p = text; |
5967 | *data_p = data - (text_end - text); | |
1b3f6016 | 5968 | |
52fb6437 NS |
5969 | return 1; |
5970 | } | |
5203ae1e TBA |
5971 | return 0; |
5972 | #else | |
5973 | gdb_assert_not_reached ("target op read_offsets not supported"); | |
52fb6437 | 5974 | #endif |
5203ae1e | 5975 | } |
52fb6437 | 5976 | |
6e3fd7e9 TBA |
5977 | bool |
5978 | linux_process_target::supports_get_tls_address () | |
5979 | { | |
5980 | #ifdef USE_THREAD_DB | |
5981 | return true; | |
5982 | #else | |
5983 | return false; | |
5984 | #endif | |
5985 | } | |
5986 | ||
5987 | int | |
5988 | linux_process_target::get_tls_address (thread_info *thread, | |
5989 | CORE_ADDR offset, | |
5990 | CORE_ADDR load_module, | |
5991 | CORE_ADDR *address) | |
5992 | { | |
5993 | #ifdef USE_THREAD_DB | |
5994 | return thread_db_get_tls_address (thread, offset, load_module, address); | |
5995 | #else | |
5996 | return -1; | |
5997 | #endif | |
5998 | } | |
5999 | ||
2d0795ee TBA |
6000 | bool |
6001 | linux_process_target::supports_qxfer_osdata () | |
6002 | { | |
6003 | return true; | |
6004 | } | |
6005 | ||
6006 | int | |
6007 | linux_process_target::qxfer_osdata (const char *annex, | |
6008 | unsigned char *readbuf, | |
6009 | unsigned const char *writebuf, | |
6010 | CORE_ADDR offset, int len) | |
07e059b5 | 6011 | { |
d26e3629 | 6012 | return linux_common_xfer_osdata (annex, readbuf, offset, len); |
07e059b5 VP |
6013 | } |
6014 | ||
cb63de7c TBA |
6015 | void |
6016 | linux_process_target::siginfo_fixup (siginfo_t *siginfo, | |
6017 | gdb_byte *inf_siginfo, int direction) | |
d0722149 | 6018 | { |
cb63de7c | 6019 | bool done = low_siginfo_fixup (siginfo, inf_siginfo, direction); |
d0722149 DE |
6020 | |
6021 | /* If there was no callback, or the callback didn't do anything, | |
6022 | then just do a straight memcpy. */ | |
6023 | if (!done) | |
6024 | { | |
6025 | if (direction == 1) | |
a5362b9a | 6026 | memcpy (siginfo, inf_siginfo, sizeof (siginfo_t)); |
d0722149 | 6027 | else |
a5362b9a | 6028 | memcpy (inf_siginfo, siginfo, sizeof (siginfo_t)); |
d0722149 DE |
6029 | } |
6030 | } | |
6031 | ||
cb63de7c TBA |
6032 | bool |
6033 | linux_process_target::low_siginfo_fixup (siginfo_t *native, gdb_byte *inf, | |
6034 | int direction) | |
6035 | { | |
6036 | return false; | |
6037 | } | |
6038 | ||
d7abedf7 TBA |
6039 | bool |
6040 | linux_process_target::supports_qxfer_siginfo () | |
6041 | { | |
6042 | return true; | |
6043 | } | |
6044 | ||
6045 | int | |
6046 | linux_process_target::qxfer_siginfo (const char *annex, | |
6047 | unsigned char *readbuf, | |
6048 | unsigned const char *writebuf, | |
6049 | CORE_ADDR offset, int len) | |
4aa995e1 | 6050 | { |
d0722149 | 6051 | int pid; |
a5362b9a | 6052 | siginfo_t siginfo; |
8adce034 | 6053 | gdb_byte inf_siginfo[sizeof (siginfo_t)]; |
4aa995e1 | 6054 | |
0bfdf32f | 6055 | if (current_thread == NULL) |
4aa995e1 PA |
6056 | return -1; |
6057 | ||
0bfdf32f | 6058 | pid = lwpid_of (current_thread); |
4aa995e1 PA |
6059 | |
6060 | if (debug_threads) | |
87ce2a04 DE |
6061 | debug_printf ("%s siginfo for lwp %d.\n", |
6062 | readbuf != NULL ? "Reading" : "Writing", | |
6063 | pid); | |
4aa995e1 | 6064 | |
0adea5f7 | 6065 | if (offset >= sizeof (siginfo)) |
4aa995e1 PA |
6066 | return -1; |
6067 | ||
b8e1b30e | 6068 | if (ptrace (PTRACE_GETSIGINFO, pid, (PTRACE_TYPE_ARG3) 0, &siginfo) != 0) |
4aa995e1 PA |
6069 | return -1; |
6070 | ||
d0722149 DE |
6071 | /* When GDBSERVER is built as a 64-bit application, ptrace writes into |
6072 | SIGINFO an object with 64-bit layout. Since debugging a 32-bit | |
6073 | inferior with a 64-bit GDBSERVER should look the same as debugging it | |
6074 | with a 32-bit GDBSERVER, we need to convert it. */ | |
6075 | siginfo_fixup (&siginfo, inf_siginfo, 0); | |
6076 | ||
4aa995e1 PA |
6077 | if (offset + len > sizeof (siginfo)) |
6078 | len = sizeof (siginfo) - offset; | |
6079 | ||
6080 | if (readbuf != NULL) | |
d0722149 | 6081 | memcpy (readbuf, inf_siginfo + offset, len); |
4aa995e1 PA |
6082 | else |
6083 | { | |
d0722149 DE |
6084 | memcpy (inf_siginfo + offset, writebuf, len); |
6085 | ||
6086 | /* Convert back to ptrace layout before flushing it out. */ | |
6087 | siginfo_fixup (&siginfo, inf_siginfo, 1); | |
6088 | ||
b8e1b30e | 6089 | if (ptrace (PTRACE_SETSIGINFO, pid, (PTRACE_TYPE_ARG3) 0, &siginfo) != 0) |
4aa995e1 PA |
6090 | return -1; |
6091 | } | |
6092 | ||
6093 | return len; | |
6094 | } | |
6095 | ||
bd99dc85 PA |
6096 | /* SIGCHLD handler that serves two purposes: In non-stop/async mode, |
6097 | so we notice when children change state; as the handler for the | |
6098 | sigsuspend in my_waitpid. */ | |
6099 | ||
6100 | static void | |
6101 | sigchld_handler (int signo) | |
6102 | { | |
6103 | int old_errno = errno; | |
6104 | ||
6105 | if (debug_threads) | |
e581f2b4 PA |
6106 | { |
6107 | do | |
6108 | { | |
a7e559cc AH |
6109 | /* Use the async signal safe debug function. */ |
6110 | if (debug_write ("sigchld_handler\n", | |
6111 | sizeof ("sigchld_handler\n") - 1) < 0) | |
e581f2b4 PA |
6112 | break; /* just ignore */ |
6113 | } while (0); | |
6114 | } | |
bd99dc85 PA |
6115 | |
6116 | if (target_is_async_p ()) | |
6117 | async_file_mark (); /* trigger a linux_wait */ | |
6118 | ||
6119 | errno = old_errno; | |
6120 | } | |
6121 | ||
0dc587d4 TBA |
6122 | bool |
6123 | linux_process_target::supports_non_stop () | |
bd99dc85 | 6124 | { |
0dc587d4 | 6125 | return true; |
bd99dc85 PA |
6126 | } |
6127 | ||
0dc587d4 TBA |
6128 | bool |
6129 | linux_process_target::async (bool enable) | |
bd99dc85 | 6130 | { |
0dc587d4 | 6131 | bool previous = target_is_async_p (); |
bd99dc85 | 6132 | |
8336d594 | 6133 | if (debug_threads) |
87ce2a04 DE |
6134 | debug_printf ("linux_async (%d), previous=%d\n", |
6135 | enable, previous); | |
8336d594 | 6136 | |
bd99dc85 PA |
6137 | if (previous != enable) |
6138 | { | |
6139 | sigset_t mask; | |
6140 | sigemptyset (&mask); | |
6141 | sigaddset (&mask, SIGCHLD); | |
6142 | ||
21987b9c | 6143 | gdb_sigmask (SIG_BLOCK, &mask, NULL); |
bd99dc85 PA |
6144 | |
6145 | if (enable) | |
6146 | { | |
6147 | if (pipe (linux_event_pipe) == -1) | |
aa96c426 GB |
6148 | { |
6149 | linux_event_pipe[0] = -1; | |
6150 | linux_event_pipe[1] = -1; | |
21987b9c | 6151 | gdb_sigmask (SIG_UNBLOCK, &mask, NULL); |
aa96c426 GB |
6152 | |
6153 | warning ("creating event pipe failed."); | |
6154 | return previous; | |
6155 | } | |
bd99dc85 PA |
6156 | |
6157 | fcntl (linux_event_pipe[0], F_SETFL, O_NONBLOCK); | |
6158 | fcntl (linux_event_pipe[1], F_SETFL, O_NONBLOCK); | |
6159 | ||
6160 | /* Register the event loop handler. */ | |
6161 | add_file_handler (linux_event_pipe[0], | |
6162 | handle_target_event, NULL); | |
6163 | ||
6164 | /* Always trigger a linux_wait. */ | |
6165 | async_file_mark (); | |
6166 | } | |
6167 | else | |
6168 | { | |
6169 | delete_file_handler (linux_event_pipe[0]); | |
6170 | ||
6171 | close (linux_event_pipe[0]); | |
6172 | close (linux_event_pipe[1]); | |
6173 | linux_event_pipe[0] = -1; | |
6174 | linux_event_pipe[1] = -1; | |
6175 | } | |
6176 | ||
21987b9c | 6177 | gdb_sigmask (SIG_UNBLOCK, &mask, NULL); |
bd99dc85 PA |
6178 | } |
6179 | ||
6180 | return previous; | |
6181 | } | |
6182 | ||
0dc587d4 TBA |
6183 | int |
6184 | linux_process_target::start_non_stop (bool nonstop) | |
bd99dc85 PA |
6185 | { |
6186 | /* Register or unregister from event-loop accordingly. */ | |
0dc587d4 | 6187 | target_async (nonstop); |
aa96c426 | 6188 | |
0dc587d4 | 6189 | if (target_is_async_p () != (nonstop != false)) |
aa96c426 GB |
6190 | return -1; |
6191 | ||
bd99dc85 PA |
6192 | return 0; |
6193 | } | |
6194 | ||
652aef77 TBA |
6195 | bool |
6196 | linux_process_target::supports_multi_process () | |
cf8fd78b | 6197 | { |
652aef77 | 6198 | return true; |
cf8fd78b PA |
6199 | } |
6200 | ||
89245bc0 DB |
6201 | /* Check if fork events are supported. */ |
6202 | ||
9690a72a TBA |
6203 | bool |
6204 | linux_process_target::supports_fork_events () | |
89245bc0 DB |
6205 | { |
6206 | return linux_supports_tracefork (); | |
6207 | } | |
6208 | ||
6209 | /* Check if vfork events are supported. */ | |
6210 | ||
9690a72a TBA |
6211 | bool |
6212 | linux_process_target::supports_vfork_events () | |
89245bc0 DB |
6213 | { |
6214 | return linux_supports_tracefork (); | |
6215 | } | |
6216 | ||
94585166 DB |
6217 | /* Check if exec events are supported. */ |
6218 | ||
9690a72a TBA |
6219 | bool |
6220 | linux_process_target::supports_exec_events () | |
94585166 DB |
6221 | { |
6222 | return linux_supports_traceexec (); | |
6223 | } | |
6224 | ||
de0d863e DB |
6225 | /* Target hook for 'handle_new_gdb_connection'. Causes a reset of the |
6226 | ptrace flags for all inferiors. This is in case the new GDB connection | |
6227 | doesn't support the same set of events that the previous one did. */ | |
6228 | ||
fb00dfce TBA |
6229 | void |
6230 | linux_process_target::handle_new_gdb_connection () | |
de0d863e | 6231 | { |
de0d863e | 6232 | /* Request that all the lwps reset their ptrace options. */ |
bbf550d5 SM |
6233 | for_each_thread ([] (thread_info *thread) |
6234 | { | |
6235 | struct lwp_info *lwp = get_thread_lwp (thread); | |
6236 | ||
6237 | if (!lwp->stopped) | |
6238 | { | |
6239 | /* Stop the lwp so we can modify its ptrace options. */ | |
6240 | lwp->must_set_ptrace_flags = 1; | |
6241 | linux_stop_lwp (lwp); | |
6242 | } | |
6243 | else | |
6244 | { | |
6245 | /* Already stopped; go ahead and set the ptrace options. */ | |
6246 | struct process_info *proc = find_process_pid (pid_of (thread)); | |
6247 | int options = linux_low_ptrace_options (proc->attached); | |
6248 | ||
6249 | linux_enable_event_reporting (lwpid_of (thread), options); | |
6250 | lwp->must_set_ptrace_flags = 0; | |
6251 | } | |
6252 | }); | |
de0d863e DB |
6253 | } |
6254 | ||
55cf3021 TBA |
6255 | int |
6256 | linux_process_target::handle_monitor_command (char *mon) | |
6257 | { | |
6258 | #ifdef USE_THREAD_DB | |
6259 | return thread_db_handle_monitor_command (mon); | |
6260 | #else | |
6261 | return 0; | |
6262 | #endif | |
6263 | } | |
6264 | ||
95a45fc1 TBA |
6265 | int |
6266 | linux_process_target::core_of_thread (ptid_t ptid) | |
6267 | { | |
6268 | return linux_common_core_of_thread (ptid); | |
6269 | } | |
6270 | ||
c756403b TBA |
6271 | bool |
6272 | linux_process_target::supports_disable_randomization () | |
03583c20 UW |
6273 | { |
6274 | #ifdef HAVE_PERSONALITY | |
c756403b | 6275 | return true; |
03583c20 | 6276 | #else |
c756403b | 6277 | return false; |
03583c20 UW |
6278 | #endif |
6279 | } | |
efcbbd14 | 6280 | |
c0245cb9 TBA |
6281 | bool |
6282 | linux_process_target::supports_agent () | |
d1feda86 | 6283 | { |
c0245cb9 | 6284 | return true; |
d1feda86 YQ |
6285 | } |
6286 | ||
2526e0cd TBA |
6287 | bool |
6288 | linux_process_target::supports_range_stepping () | |
c2d6af84 | 6289 | { |
7582c77c | 6290 | if (supports_software_single_step ()) |
2526e0cd | 6291 | return true; |
c2d6af84 | 6292 | if (*the_low_target.supports_range_stepping == NULL) |
2526e0cd | 6293 | return false; |
c2d6af84 PA |
6294 | |
6295 | return (*the_low_target.supports_range_stepping) (); | |
6296 | } | |
6297 | ||
8247b823 TBA |
6298 | bool |
6299 | linux_process_target::supports_pid_to_exec_file () | |
6300 | { | |
6301 | return true; | |
6302 | } | |
6303 | ||
6304 | char * | |
6305 | linux_process_target::pid_to_exec_file (int pid) | |
6306 | { | |
6307 | return linux_proc_pid_to_exec_file (pid); | |
6308 | } | |
6309 | ||
c9b7b804 TBA |
6310 | bool |
6311 | linux_process_target::supports_multifs () | |
6312 | { | |
6313 | return true; | |
6314 | } | |
6315 | ||
6316 | int | |
6317 | linux_process_target::multifs_open (int pid, const char *filename, | |
6318 | int flags, mode_t mode) | |
6319 | { | |
6320 | return linux_mntns_open_cloexec (pid, filename, flags, mode); | |
6321 | } | |
6322 | ||
6323 | int | |
6324 | linux_process_target::multifs_unlink (int pid, const char *filename) | |
6325 | { | |
6326 | return linux_mntns_unlink (pid, filename); | |
6327 | } | |
6328 | ||
6329 | ssize_t | |
6330 | linux_process_target::multifs_readlink (int pid, const char *filename, | |
6331 | char *buf, size_t bufsiz) | |
6332 | { | |
6333 | return linux_mntns_readlink (pid, filename, buf, bufsiz); | |
6334 | } | |
6335 | ||
723b724b | 6336 | #if defined PT_GETDSBT || defined PTRACE_GETFDPIC |
78d85199 YQ |
6337 | struct target_loadseg |
6338 | { | |
6339 | /* Core address to which the segment is mapped. */ | |
6340 | Elf32_Addr addr; | |
6341 | /* VMA recorded in the program header. */ | |
6342 | Elf32_Addr p_vaddr; | |
6343 | /* Size of this segment in memory. */ | |
6344 | Elf32_Word p_memsz; | |
6345 | }; | |
6346 | ||
723b724b | 6347 | # if defined PT_GETDSBT |
78d85199 YQ |
6348 | struct target_loadmap |
6349 | { | |
6350 | /* Protocol version number, must be zero. */ | |
6351 | Elf32_Word version; | |
6352 | /* Pointer to the DSBT table, its size, and the DSBT index. */ | |
6353 | unsigned *dsbt_table; | |
6354 | unsigned dsbt_size, dsbt_index; | |
6355 | /* Number of segments in this map. */ | |
6356 | Elf32_Word nsegs; | |
6357 | /* The actual memory map. */ | |
6358 | struct target_loadseg segs[/*nsegs*/]; | |
6359 | }; | |
723b724b MF |
6360 | # define LINUX_LOADMAP PT_GETDSBT |
6361 | # define LINUX_LOADMAP_EXEC PTRACE_GETDSBT_EXEC | |
6362 | # define LINUX_LOADMAP_INTERP PTRACE_GETDSBT_INTERP | |
6363 | # else | |
6364 | struct target_loadmap | |
6365 | { | |
6366 | /* Protocol version number, must be zero. */ | |
6367 | Elf32_Half version; | |
6368 | /* Number of segments in this map. */ | |
6369 | Elf32_Half nsegs; | |
6370 | /* The actual memory map. */ | |
6371 | struct target_loadseg segs[/*nsegs*/]; | |
6372 | }; | |
6373 | # define LINUX_LOADMAP PTRACE_GETFDPIC | |
6374 | # define LINUX_LOADMAP_EXEC PTRACE_GETFDPIC_EXEC | |
6375 | # define LINUX_LOADMAP_INTERP PTRACE_GETFDPIC_INTERP | |
6376 | # endif | |
78d85199 | 6377 | |
9da41fda TBA |
6378 | bool |
6379 | linux_process_target::supports_read_loadmap () | |
6380 | { | |
6381 | return true; | |
6382 | } | |
6383 | ||
6384 | int | |
6385 | linux_process_target::read_loadmap (const char *annex, CORE_ADDR offset, | |
6386 | unsigned char *myaddr, unsigned int len) | |
78d85199 | 6387 | { |
0bfdf32f | 6388 | int pid = lwpid_of (current_thread); |
78d85199 YQ |
6389 | int addr = -1; |
6390 | struct target_loadmap *data = NULL; | |
6391 | unsigned int actual_length, copy_length; | |
6392 | ||
6393 | if (strcmp (annex, "exec") == 0) | |
723b724b | 6394 | addr = (int) LINUX_LOADMAP_EXEC; |
78d85199 | 6395 | else if (strcmp (annex, "interp") == 0) |
723b724b | 6396 | addr = (int) LINUX_LOADMAP_INTERP; |
78d85199 YQ |
6397 | else |
6398 | return -1; | |
6399 | ||
723b724b | 6400 | if (ptrace (LINUX_LOADMAP, pid, addr, &data) != 0) |
78d85199 YQ |
6401 | return -1; |
6402 | ||
6403 | if (data == NULL) | |
6404 | return -1; | |
6405 | ||
6406 | actual_length = sizeof (struct target_loadmap) | |
6407 | + sizeof (struct target_loadseg) * data->nsegs; | |
6408 | ||
6409 | if (offset < 0 || offset > actual_length) | |
6410 | return -1; | |
6411 | ||
6412 | copy_length = actual_length - offset < len ? actual_length - offset : len; | |
6413 | memcpy (myaddr, (char *) data + offset, copy_length); | |
6414 | return copy_length; | |
6415 | } | |
723b724b | 6416 | #endif /* defined PT_GETDSBT || defined PTRACE_GETFDPIC */ |
78d85199 | 6417 | |
bc8d3ae4 TBA |
6418 | bool |
6419 | linux_process_target::supports_catch_syscall () | |
82075af2 JS |
6420 | { |
6421 | return (the_low_target.get_syscall_trapinfo != NULL | |
6422 | && linux_supports_tracesysgood ()); | |
6423 | } | |
6424 | ||
d633e831 TBA |
6425 | int |
6426 | linux_process_target::get_ipa_tdesc_idx () | |
ae91f625 MK |
6427 | { |
6428 | if (the_low_target.get_ipa_tdesc_idx == NULL) | |
6429 | return 0; | |
6430 | ||
6431 | return (*the_low_target.get_ipa_tdesc_idx) (); | |
6432 | } | |
6433 | ||
770d8f6a TBA |
6434 | CORE_ADDR |
6435 | linux_process_target::read_pc (regcache *regcache) | |
219f2f23 | 6436 | { |
bf9ae9d8 | 6437 | if (!low_supports_breakpoints ()) |
219f2f23 PA |
6438 | return 0; |
6439 | ||
bf9ae9d8 | 6440 | return low_get_pc (regcache); |
219f2f23 PA |
6441 | } |
6442 | ||
770d8f6a TBA |
6443 | void |
6444 | linux_process_target::write_pc (regcache *regcache, CORE_ADDR pc) | |
219f2f23 | 6445 | { |
bf9ae9d8 | 6446 | gdb_assert (low_supports_breakpoints ()); |
219f2f23 | 6447 | |
bf9ae9d8 | 6448 | low_set_pc (regcache, pc); |
219f2f23 PA |
6449 | } |
6450 | ||
68119632 TBA |
6451 | bool |
6452 | linux_process_target::supports_thread_stopped () | |
6453 | { | |
6454 | return true; | |
6455 | } | |
6456 | ||
6457 | bool | |
6458 | linux_process_target::thread_stopped (thread_info *thread) | |
8336d594 PA |
6459 | { |
6460 | return get_thread_lwp (thread)->stopped; | |
6461 | } | |
6462 | ||
6463 | /* This exposes stop-all-threads functionality to other modules. */ | |
6464 | ||
29e8dc09 TBA |
6465 | void |
6466 | linux_process_target::pause_all (bool freeze) | |
8336d594 | 6467 | { |
7984d532 PA |
6468 | stop_all_lwps (freeze, NULL); |
6469 | } | |
6470 | ||
6471 | /* This exposes unstop-all-threads functionality to other gdbserver | |
6472 | modules. */ | |
6473 | ||
29e8dc09 TBA |
6474 | void |
6475 | linux_process_target::unpause_all (bool unfreeze) | |
7984d532 PA |
6476 | { |
6477 | unstop_all_lwps (unfreeze, NULL); | |
8336d594 PA |
6478 | } |
6479 | ||
79b44087 TBA |
6480 | int |
6481 | linux_process_target::prepare_to_access_memory () | |
90d74c30 PA |
6482 | { |
6483 | /* Neither ptrace nor /proc/PID/mem allow accessing memory through a | |
6484 | running LWP. */ | |
6485 | if (non_stop) | |
29e8dc09 | 6486 | target_pause_all (true); |
90d74c30 PA |
6487 | return 0; |
6488 | } | |
6489 | ||
79b44087 TBA |
6490 | void |
6491 | linux_process_target::done_accessing_memory () | |
90d74c30 PA |
6492 | { |
6493 | /* Neither ptrace nor /proc/PID/mem allow accessing memory through a | |
6494 | running LWP. */ | |
6495 | if (non_stop) | |
29e8dc09 | 6496 | target_unpause_all (true); |
90d74c30 PA |
6497 | } |
6498 | ||
345dafad TBA |
6499 | emit_ops * |
6500 | linux_process_target::emit_ops () | |
6a271cae PA |
6501 | { |
6502 | if (the_low_target.emit_ops != NULL) | |
6503 | return (*the_low_target.emit_ops) (); | |
6504 | else | |
6505 | return NULL; | |
6506 | } | |
6507 | ||
2268b414 JK |
6508 | /* Extract &phdr and num_phdr in the inferior. Return 0 on success. */ |
6509 | ||
6510 | static int | |
6511 | get_phdr_phnum_from_proc_auxv (const int pid, const int is_elf64, | |
6512 | CORE_ADDR *phdr_memaddr, int *num_phdr) | |
6513 | { | |
6514 | char filename[PATH_MAX]; | |
6515 | int fd; | |
6516 | const int auxv_size = is_elf64 | |
6517 | ? sizeof (Elf64_auxv_t) : sizeof (Elf32_auxv_t); | |
6518 | char buf[sizeof (Elf64_auxv_t)]; /* The larger of the two. */ | |
6519 | ||
6520 | xsnprintf (filename, sizeof filename, "/proc/%d/auxv", pid); | |
6521 | ||
6522 | fd = open (filename, O_RDONLY); | |
6523 | if (fd < 0) | |
6524 | return 1; | |
6525 | ||
6526 | *phdr_memaddr = 0; | |
6527 | *num_phdr = 0; | |
6528 | while (read (fd, buf, auxv_size) == auxv_size | |
6529 | && (*phdr_memaddr == 0 || *num_phdr == 0)) | |
6530 | { | |
6531 | if (is_elf64) | |
6532 | { | |
6533 | Elf64_auxv_t *const aux = (Elf64_auxv_t *) buf; | |
6534 | ||
6535 | switch (aux->a_type) | |
6536 | { | |
6537 | case AT_PHDR: | |
6538 | *phdr_memaddr = aux->a_un.a_val; | |
6539 | break; | |
6540 | case AT_PHNUM: | |
6541 | *num_phdr = aux->a_un.a_val; | |
6542 | break; | |
6543 | } | |
6544 | } | |
6545 | else | |
6546 | { | |
6547 | Elf32_auxv_t *const aux = (Elf32_auxv_t *) buf; | |
6548 | ||
6549 | switch (aux->a_type) | |
6550 | { | |
6551 | case AT_PHDR: | |
6552 | *phdr_memaddr = aux->a_un.a_val; | |
6553 | break; | |
6554 | case AT_PHNUM: | |
6555 | *num_phdr = aux->a_un.a_val; | |
6556 | break; | |
6557 | } | |
6558 | } | |
6559 | } | |
6560 | ||
6561 | close (fd); | |
6562 | ||
6563 | if (*phdr_memaddr == 0 || *num_phdr == 0) | |
6564 | { | |
6565 | warning ("Unexpected missing AT_PHDR and/or AT_PHNUM: " | |
6566 | "phdr_memaddr = %ld, phdr_num = %d", | |
6567 | (long) *phdr_memaddr, *num_phdr); | |
6568 | return 2; | |
6569 | } | |
6570 | ||
6571 | return 0; | |
6572 | } | |
6573 | ||
6574 | /* Return &_DYNAMIC (via PT_DYNAMIC) in the inferior, or 0 if not present. */ | |
6575 | ||
6576 | static CORE_ADDR | |
6577 | get_dynamic (const int pid, const int is_elf64) | |
6578 | { | |
6579 | CORE_ADDR phdr_memaddr, relocation; | |
db1ff28b | 6580 | int num_phdr, i; |
2268b414 | 6581 | unsigned char *phdr_buf; |
db1ff28b | 6582 | const int phdr_size = is_elf64 ? sizeof (Elf64_Phdr) : sizeof (Elf32_Phdr); |
2268b414 JK |
6583 | |
6584 | if (get_phdr_phnum_from_proc_auxv (pid, is_elf64, &phdr_memaddr, &num_phdr)) | |
6585 | return 0; | |
6586 | ||
6587 | gdb_assert (num_phdr < 100); /* Basic sanity check. */ | |
224c3ddb | 6588 | phdr_buf = (unsigned char *) alloca (num_phdr * phdr_size); |
2268b414 JK |
6589 | |
6590 | if (linux_read_memory (phdr_memaddr, phdr_buf, num_phdr * phdr_size)) | |
6591 | return 0; | |
6592 | ||
6593 | /* Compute relocation: it is expected to be 0 for "regular" executables, | |
6594 | non-zero for PIE ones. */ | |
6595 | relocation = -1; | |
db1ff28b JK |
6596 | for (i = 0; relocation == -1 && i < num_phdr; i++) |
6597 | if (is_elf64) | |
6598 | { | |
6599 | Elf64_Phdr *const p = (Elf64_Phdr *) (phdr_buf + i * phdr_size); | |
6600 | ||
6601 | if (p->p_type == PT_PHDR) | |
6602 | relocation = phdr_memaddr - p->p_vaddr; | |
6603 | } | |
6604 | else | |
6605 | { | |
6606 | Elf32_Phdr *const p = (Elf32_Phdr *) (phdr_buf + i * phdr_size); | |
6607 | ||
6608 | if (p->p_type == PT_PHDR) | |
6609 | relocation = phdr_memaddr - p->p_vaddr; | |
6610 | } | |
6611 | ||
2268b414 JK |
6612 | if (relocation == -1) |
6613 | { | |
e237a7e2 JK |
6614 | /* PT_PHDR is optional, but necessary for PIE in general. Fortunately |
6615 | any real world executables, including PIE executables, have always | |
6616 | PT_PHDR present. PT_PHDR is not present in some shared libraries or | |
6617 | in fpc (Free Pascal 2.4) binaries but neither of those have a need for | |
6618 | or present DT_DEBUG anyway (fpc binaries are statically linked). | |
6619 | ||
6620 | Therefore if there exists DT_DEBUG there is always also PT_PHDR. | |
6621 | ||
6622 | GDB could find RELOCATION also from AT_ENTRY - e_entry. */ | |
6623 | ||
2268b414 JK |
6624 | return 0; |
6625 | } | |
6626 | ||
db1ff28b JK |
6627 | for (i = 0; i < num_phdr; i++) |
6628 | { | |
6629 | if (is_elf64) | |
6630 | { | |
6631 | Elf64_Phdr *const p = (Elf64_Phdr *) (phdr_buf + i * phdr_size); | |
6632 | ||
6633 | if (p->p_type == PT_DYNAMIC) | |
6634 | return p->p_vaddr + relocation; | |
6635 | } | |
6636 | else | |
6637 | { | |
6638 | Elf32_Phdr *const p = (Elf32_Phdr *) (phdr_buf + i * phdr_size); | |
2268b414 | 6639 | |
db1ff28b JK |
6640 | if (p->p_type == PT_DYNAMIC) |
6641 | return p->p_vaddr + relocation; | |
6642 | } | |
6643 | } | |
2268b414 JK |
6644 | |
6645 | return 0; | |
6646 | } | |
6647 | ||
6648 | /* Return &_r_debug in the inferior, or -1 if not present. Return value | |
367ba2c2 MR |
6649 | can be 0 if the inferior does not yet have the library list initialized. |
6650 | We look for DT_MIPS_RLD_MAP first. MIPS executables use this instead of | |
6651 | DT_DEBUG, although they sometimes contain an unused DT_DEBUG entry too. */ | |
2268b414 JK |
6652 | |
6653 | static CORE_ADDR | |
6654 | get_r_debug (const int pid, const int is_elf64) | |
6655 | { | |
6656 | CORE_ADDR dynamic_memaddr; | |
6657 | const int dyn_size = is_elf64 ? sizeof (Elf64_Dyn) : sizeof (Elf32_Dyn); | |
6658 | unsigned char buf[sizeof (Elf64_Dyn)]; /* The larger of the two. */ | |
367ba2c2 | 6659 | CORE_ADDR map = -1; |
2268b414 JK |
6660 | |
6661 | dynamic_memaddr = get_dynamic (pid, is_elf64); | |
6662 | if (dynamic_memaddr == 0) | |
367ba2c2 | 6663 | return map; |
2268b414 JK |
6664 | |
6665 | while (linux_read_memory (dynamic_memaddr, buf, dyn_size) == 0) | |
6666 | { | |
6667 | if (is_elf64) | |
6668 | { | |
6669 | Elf64_Dyn *const dyn = (Elf64_Dyn *) buf; | |
a738da3a | 6670 | #if defined DT_MIPS_RLD_MAP || defined DT_MIPS_RLD_MAP_REL |
367ba2c2 MR |
6671 | union |
6672 | { | |
6673 | Elf64_Xword map; | |
6674 | unsigned char buf[sizeof (Elf64_Xword)]; | |
6675 | } | |
6676 | rld_map; | |
a738da3a MF |
6677 | #endif |
6678 | #ifdef DT_MIPS_RLD_MAP | |
367ba2c2 MR |
6679 | if (dyn->d_tag == DT_MIPS_RLD_MAP) |
6680 | { | |
6681 | if (linux_read_memory (dyn->d_un.d_val, | |
6682 | rld_map.buf, sizeof (rld_map.buf)) == 0) | |
6683 | return rld_map.map; | |
6684 | else | |
6685 | break; | |
6686 | } | |
75f62ce7 | 6687 | #endif /* DT_MIPS_RLD_MAP */ |
a738da3a MF |
6688 | #ifdef DT_MIPS_RLD_MAP_REL |
6689 | if (dyn->d_tag == DT_MIPS_RLD_MAP_REL) | |
6690 | { | |
6691 | if (linux_read_memory (dyn->d_un.d_val + dynamic_memaddr, | |
6692 | rld_map.buf, sizeof (rld_map.buf)) == 0) | |
6693 | return rld_map.map; | |
6694 | else | |
6695 | break; | |
6696 | } | |
6697 | #endif /* DT_MIPS_RLD_MAP_REL */ | |
2268b414 | 6698 | |
367ba2c2 MR |
6699 | if (dyn->d_tag == DT_DEBUG && map == -1) |
6700 | map = dyn->d_un.d_val; | |
2268b414 JK |
6701 | |
6702 | if (dyn->d_tag == DT_NULL) | |
6703 | break; | |
6704 | } | |
6705 | else | |
6706 | { | |
6707 | Elf32_Dyn *const dyn = (Elf32_Dyn *) buf; | |
a738da3a | 6708 | #if defined DT_MIPS_RLD_MAP || defined DT_MIPS_RLD_MAP_REL |
367ba2c2 MR |
6709 | union |
6710 | { | |
6711 | Elf32_Word map; | |
6712 | unsigned char buf[sizeof (Elf32_Word)]; | |
6713 | } | |
6714 | rld_map; | |
a738da3a MF |
6715 | #endif |
6716 | #ifdef DT_MIPS_RLD_MAP | |
367ba2c2 MR |
6717 | if (dyn->d_tag == DT_MIPS_RLD_MAP) |
6718 | { | |
6719 | if (linux_read_memory (dyn->d_un.d_val, | |
6720 | rld_map.buf, sizeof (rld_map.buf)) == 0) | |
6721 | return rld_map.map; | |
6722 | else | |
6723 | break; | |
6724 | } | |
75f62ce7 | 6725 | #endif /* DT_MIPS_RLD_MAP */ |
a738da3a MF |
6726 | #ifdef DT_MIPS_RLD_MAP_REL |
6727 | if (dyn->d_tag == DT_MIPS_RLD_MAP_REL) | |
6728 | { | |
6729 | if (linux_read_memory (dyn->d_un.d_val + dynamic_memaddr, | |
6730 | rld_map.buf, sizeof (rld_map.buf)) == 0) | |
6731 | return rld_map.map; | |
6732 | else | |
6733 | break; | |
6734 | } | |
6735 | #endif /* DT_MIPS_RLD_MAP_REL */ | |
2268b414 | 6736 | |
367ba2c2 MR |
6737 | if (dyn->d_tag == DT_DEBUG && map == -1) |
6738 | map = dyn->d_un.d_val; | |
2268b414 JK |
6739 | |
6740 | if (dyn->d_tag == DT_NULL) | |
6741 | break; | |
6742 | } | |
6743 | ||
6744 | dynamic_memaddr += dyn_size; | |
6745 | } | |
6746 | ||
367ba2c2 | 6747 | return map; |
2268b414 JK |
6748 | } |
6749 | ||
6750 | /* Read one pointer from MEMADDR in the inferior. */ | |
6751 | ||
6752 | static int | |
6753 | read_one_ptr (CORE_ADDR memaddr, CORE_ADDR *ptr, int ptr_size) | |
6754 | { | |
485f1ee4 PA |
6755 | int ret; |
6756 | ||
6757 | /* Go through a union so this works on either big or little endian | |
6758 | hosts, when the inferior's pointer size is smaller than the size | |
6759 | of CORE_ADDR. It is assumed the inferior's endianness is the | |
6760 | same of the superior's. */ | |
6761 | union | |
6762 | { | |
6763 | CORE_ADDR core_addr; | |
6764 | unsigned int ui; | |
6765 | unsigned char uc; | |
6766 | } addr; | |
6767 | ||
6768 | ret = linux_read_memory (memaddr, &addr.uc, ptr_size); | |
6769 | if (ret == 0) | |
6770 | { | |
6771 | if (ptr_size == sizeof (CORE_ADDR)) | |
6772 | *ptr = addr.core_addr; | |
6773 | else if (ptr_size == sizeof (unsigned int)) | |
6774 | *ptr = addr.ui; | |
6775 | else | |
6776 | gdb_assert_not_reached ("unhandled pointer size"); | |
6777 | } | |
6778 | return ret; | |
2268b414 JK |
6779 | } |
6780 | ||
974387bb TBA |
6781 | bool |
6782 | linux_process_target::supports_qxfer_libraries_svr4 () | |
6783 | { | |
6784 | return true; | |
6785 | } | |
6786 | ||
2268b414 JK |
6787 | struct link_map_offsets |
6788 | { | |
6789 | /* Offset and size of r_debug.r_version. */ | |
6790 | int r_version_offset; | |
6791 | ||
6792 | /* Offset and size of r_debug.r_map. */ | |
6793 | int r_map_offset; | |
6794 | ||
6795 | /* Offset to l_addr field in struct link_map. */ | |
6796 | int l_addr_offset; | |
6797 | ||
6798 | /* Offset to l_name field in struct link_map. */ | |
6799 | int l_name_offset; | |
6800 | ||
6801 | /* Offset to l_ld field in struct link_map. */ | |
6802 | int l_ld_offset; | |
6803 | ||
6804 | /* Offset to l_next field in struct link_map. */ | |
6805 | int l_next_offset; | |
6806 | ||
6807 | /* Offset to l_prev field in struct link_map. */ | |
6808 | int l_prev_offset; | |
6809 | }; | |
6810 | ||
fb723180 | 6811 | /* Construct qXfer:libraries-svr4:read reply. */ |
2268b414 | 6812 | |
974387bb TBA |
6813 | int |
6814 | linux_process_target::qxfer_libraries_svr4 (const char *annex, | |
6815 | unsigned char *readbuf, | |
6816 | unsigned const char *writebuf, | |
6817 | CORE_ADDR offset, int len) | |
2268b414 | 6818 | { |
fe978cb0 | 6819 | struct process_info_private *const priv = current_process ()->priv; |
2268b414 JK |
6820 | char filename[PATH_MAX]; |
6821 | int pid, is_elf64; | |
6822 | ||
6823 | static const struct link_map_offsets lmo_32bit_offsets = | |
6824 | { | |
6825 | 0, /* r_version offset. */ | |
6826 | 4, /* r_debug.r_map offset. */ | |
6827 | 0, /* l_addr offset in link_map. */ | |
6828 | 4, /* l_name offset in link_map. */ | |
6829 | 8, /* l_ld offset in link_map. */ | |
6830 | 12, /* l_next offset in link_map. */ | |
6831 | 16 /* l_prev offset in link_map. */ | |
6832 | }; | |
6833 | ||
6834 | static const struct link_map_offsets lmo_64bit_offsets = | |
6835 | { | |
6836 | 0, /* r_version offset. */ | |
6837 | 8, /* r_debug.r_map offset. */ | |
6838 | 0, /* l_addr offset in link_map. */ | |
6839 | 8, /* l_name offset in link_map. */ | |
6840 | 16, /* l_ld offset in link_map. */ | |
6841 | 24, /* l_next offset in link_map. */ | |
6842 | 32 /* l_prev offset in link_map. */ | |
6843 | }; | |
6844 | const struct link_map_offsets *lmo; | |
214d508e | 6845 | unsigned int machine; |
b1fbec62 GB |
6846 | int ptr_size; |
6847 | CORE_ADDR lm_addr = 0, lm_prev = 0; | |
b1fbec62 GB |
6848 | CORE_ADDR l_name, l_addr, l_ld, l_next, l_prev; |
6849 | int header_done = 0; | |
2268b414 JK |
6850 | |
6851 | if (writebuf != NULL) | |
6852 | return -2; | |
6853 | if (readbuf == NULL) | |
6854 | return -1; | |
6855 | ||
0bfdf32f | 6856 | pid = lwpid_of (current_thread); |
2268b414 | 6857 | xsnprintf (filename, sizeof filename, "/proc/%d/exe", pid); |
214d508e | 6858 | is_elf64 = elf_64_file_p (filename, &machine); |
2268b414 | 6859 | lmo = is_elf64 ? &lmo_64bit_offsets : &lmo_32bit_offsets; |
b1fbec62 | 6860 | ptr_size = is_elf64 ? 8 : 4; |
2268b414 | 6861 | |
b1fbec62 GB |
6862 | while (annex[0] != '\0') |
6863 | { | |
6864 | const char *sep; | |
6865 | CORE_ADDR *addrp; | |
da4ae14a | 6866 | int name_len; |
2268b414 | 6867 | |
b1fbec62 GB |
6868 | sep = strchr (annex, '='); |
6869 | if (sep == NULL) | |
6870 | break; | |
0c5bf5a9 | 6871 | |
da4ae14a TT |
6872 | name_len = sep - annex; |
6873 | if (name_len == 5 && startswith (annex, "start")) | |
b1fbec62 | 6874 | addrp = &lm_addr; |
da4ae14a | 6875 | else if (name_len == 4 && startswith (annex, "prev")) |
b1fbec62 GB |
6876 | addrp = &lm_prev; |
6877 | else | |
6878 | { | |
6879 | annex = strchr (sep, ';'); | |
6880 | if (annex == NULL) | |
6881 | break; | |
6882 | annex++; | |
6883 | continue; | |
6884 | } | |
6885 | ||
6886 | annex = decode_address_to_semicolon (addrp, sep + 1); | |
2268b414 | 6887 | } |
b1fbec62 GB |
6888 | |
6889 | if (lm_addr == 0) | |
2268b414 | 6890 | { |
b1fbec62 GB |
6891 | int r_version = 0; |
6892 | ||
6893 | if (priv->r_debug == 0) | |
6894 | priv->r_debug = get_r_debug (pid, is_elf64); | |
6895 | ||
6896 | /* We failed to find DT_DEBUG. Such situation will not change | |
6897 | for this inferior - do not retry it. Report it to GDB as | |
6898 | E01, see for the reasons at the GDB solib-svr4.c side. */ | |
6899 | if (priv->r_debug == (CORE_ADDR) -1) | |
6900 | return -1; | |
6901 | ||
6902 | if (priv->r_debug != 0) | |
2268b414 | 6903 | { |
b1fbec62 GB |
6904 | if (linux_read_memory (priv->r_debug + lmo->r_version_offset, |
6905 | (unsigned char *) &r_version, | |
6906 | sizeof (r_version)) != 0 | |
6907 | || r_version != 1) | |
6908 | { | |
6909 | warning ("unexpected r_debug version %d", r_version); | |
6910 | } | |
6911 | else if (read_one_ptr (priv->r_debug + lmo->r_map_offset, | |
6912 | &lm_addr, ptr_size) != 0) | |
6913 | { | |
6914 | warning ("unable to read r_map from 0x%lx", | |
6915 | (long) priv->r_debug + lmo->r_map_offset); | |
6916 | } | |
2268b414 | 6917 | } |
b1fbec62 | 6918 | } |
2268b414 | 6919 | |
f6e8a41e | 6920 | std::string document = "<library-list-svr4 version=\"1.0\""; |
b1fbec62 GB |
6921 | |
6922 | while (lm_addr | |
6923 | && read_one_ptr (lm_addr + lmo->l_name_offset, | |
6924 | &l_name, ptr_size) == 0 | |
6925 | && read_one_ptr (lm_addr + lmo->l_addr_offset, | |
6926 | &l_addr, ptr_size) == 0 | |
6927 | && read_one_ptr (lm_addr + lmo->l_ld_offset, | |
6928 | &l_ld, ptr_size) == 0 | |
6929 | && read_one_ptr (lm_addr + lmo->l_prev_offset, | |
6930 | &l_prev, ptr_size) == 0 | |
6931 | && read_one_ptr (lm_addr + lmo->l_next_offset, | |
6932 | &l_next, ptr_size) == 0) | |
6933 | { | |
6934 | unsigned char libname[PATH_MAX]; | |
6935 | ||
6936 | if (lm_prev != l_prev) | |
2268b414 | 6937 | { |
b1fbec62 GB |
6938 | warning ("Corrupted shared library list: 0x%lx != 0x%lx", |
6939 | (long) lm_prev, (long) l_prev); | |
6940 | break; | |
2268b414 JK |
6941 | } |
6942 | ||
d878444c JK |
6943 | /* Ignore the first entry even if it has valid name as the first entry |
6944 | corresponds to the main executable. The first entry should not be | |
6945 | skipped if the dynamic loader was loaded late by a static executable | |
6946 | (see solib-svr4.c parameter ignore_first). But in such case the main | |
6947 | executable does not have PT_DYNAMIC present and this function already | |
6948 | exited above due to failed get_r_debug. */ | |
6949 | if (lm_prev == 0) | |
f6e8a41e | 6950 | string_appendf (document, " main-lm=\"0x%lx\"", (unsigned long) lm_addr); |
d878444c JK |
6951 | else |
6952 | { | |
6953 | /* Not checking for error because reading may stop before | |
6954 | we've got PATH_MAX worth of characters. */ | |
6955 | libname[0] = '\0'; | |
6956 | linux_read_memory (l_name, libname, sizeof (libname) - 1); | |
6957 | libname[sizeof (libname) - 1] = '\0'; | |
6958 | if (libname[0] != '\0') | |
2268b414 | 6959 | { |
d878444c JK |
6960 | if (!header_done) |
6961 | { | |
6962 | /* Terminate `<library-list-svr4'. */ | |
f6e8a41e | 6963 | document += '>'; |
d878444c JK |
6964 | header_done = 1; |
6965 | } | |
2268b414 | 6966 | |
e6a58aa8 SM |
6967 | string_appendf (document, "<library name=\""); |
6968 | xml_escape_text_append (&document, (char *) libname); | |
6969 | string_appendf (document, "\" lm=\"0x%lx\" " | |
f6e8a41e | 6970 | "l_addr=\"0x%lx\" l_ld=\"0x%lx\"/>", |
e6a58aa8 SM |
6971 | (unsigned long) lm_addr, (unsigned long) l_addr, |
6972 | (unsigned long) l_ld); | |
d878444c | 6973 | } |
0afae3cf | 6974 | } |
b1fbec62 GB |
6975 | |
6976 | lm_prev = lm_addr; | |
6977 | lm_addr = l_next; | |
2268b414 JK |
6978 | } |
6979 | ||
b1fbec62 GB |
6980 | if (!header_done) |
6981 | { | |
6982 | /* Empty list; terminate `<library-list-svr4'. */ | |
f6e8a41e | 6983 | document += "/>"; |
b1fbec62 GB |
6984 | } |
6985 | else | |
f6e8a41e | 6986 | document += "</library-list-svr4>"; |
b1fbec62 | 6987 | |
f6e8a41e | 6988 | int document_len = document.length (); |
2268b414 JK |
6989 | if (offset < document_len) |
6990 | document_len -= offset; | |
6991 | else | |
6992 | document_len = 0; | |
6993 | if (len > document_len) | |
6994 | len = document_len; | |
6995 | ||
f6e8a41e | 6996 | memcpy (readbuf, document.data () + offset, len); |
2268b414 JK |
6997 | |
6998 | return len; | |
6999 | } | |
7000 | ||
9accd112 MM |
7001 | #ifdef HAVE_LINUX_BTRACE |
7002 | ||
79597bdd TBA |
7003 | btrace_target_info * |
7004 | linux_process_target::enable_btrace (ptid_t ptid, | |
7005 | const btrace_config *conf) | |
7006 | { | |
7007 | return linux_enable_btrace (ptid, conf); | |
7008 | } | |
7009 | ||
969c39fb | 7010 | /* See to_disable_btrace target method. */ |
9accd112 | 7011 | |
79597bdd TBA |
7012 | int |
7013 | linux_process_target::disable_btrace (btrace_target_info *tinfo) | |
969c39fb MM |
7014 | { |
7015 | enum btrace_error err; | |
7016 | ||
7017 | err = linux_disable_btrace (tinfo); | |
7018 | return (err == BTRACE_ERR_NONE ? 0 : -1); | |
7019 | } | |
7020 | ||
bc504a31 | 7021 | /* Encode an Intel Processor Trace configuration. */ |
b20a6524 MM |
7022 | |
7023 | static void | |
7024 | linux_low_encode_pt_config (struct buffer *buffer, | |
7025 | const struct btrace_data_pt_config *config) | |
7026 | { | |
7027 | buffer_grow_str (buffer, "<pt-config>\n"); | |
7028 | ||
7029 | switch (config->cpu.vendor) | |
7030 | { | |
7031 | case CV_INTEL: | |
7032 | buffer_xml_printf (buffer, "<cpu vendor=\"GenuineIntel\" family=\"%u\" " | |
7033 | "model=\"%u\" stepping=\"%u\"/>\n", | |
7034 | config->cpu.family, config->cpu.model, | |
7035 | config->cpu.stepping); | |
7036 | break; | |
7037 | ||
7038 | default: | |
7039 | break; | |
7040 | } | |
7041 | ||
7042 | buffer_grow_str (buffer, "</pt-config>\n"); | |
7043 | } | |
7044 | ||
7045 | /* Encode a raw buffer. */ | |
7046 | ||
7047 | static void | |
7048 | linux_low_encode_raw (struct buffer *buffer, const gdb_byte *data, | |
7049 | unsigned int size) | |
7050 | { | |
7051 | if (size == 0) | |
7052 | return; | |
7053 | ||
268a13a5 | 7054 | /* We use hex encoding - see gdbsupport/rsp-low.h. */ |
b20a6524 MM |
7055 | buffer_grow_str (buffer, "<raw>\n"); |
7056 | ||
7057 | while (size-- > 0) | |
7058 | { | |
7059 | char elem[2]; | |
7060 | ||
7061 | elem[0] = tohex ((*data >> 4) & 0xf); | |
7062 | elem[1] = tohex (*data++ & 0xf); | |
7063 | ||
7064 | buffer_grow (buffer, elem, 2); | |
7065 | } | |
7066 | ||
7067 | buffer_grow_str (buffer, "</raw>\n"); | |
7068 | } | |
7069 | ||
969c39fb MM |
7070 | /* See to_read_btrace target method. */ |
7071 | ||
79597bdd TBA |
7072 | int |
7073 | linux_process_target::read_btrace (btrace_target_info *tinfo, | |
7074 | buffer *buffer, | |
7075 | enum btrace_read_type type) | |
9accd112 | 7076 | { |
734b0e4b | 7077 | struct btrace_data btrace; |
969c39fb | 7078 | enum btrace_error err; |
9accd112 | 7079 | |
969c39fb MM |
7080 | err = linux_read_btrace (&btrace, tinfo, type); |
7081 | if (err != BTRACE_ERR_NONE) | |
7082 | { | |
7083 | if (err == BTRACE_ERR_OVERFLOW) | |
7084 | buffer_grow_str0 (buffer, "E.Overflow."); | |
7085 | else | |
7086 | buffer_grow_str0 (buffer, "E.Generic Error."); | |
7087 | ||
8dcc53b3 | 7088 | return -1; |
969c39fb | 7089 | } |
9accd112 | 7090 | |
734b0e4b MM |
7091 | switch (btrace.format) |
7092 | { | |
7093 | case BTRACE_FORMAT_NONE: | |
7094 | buffer_grow_str0 (buffer, "E.No Trace."); | |
8dcc53b3 | 7095 | return -1; |
734b0e4b MM |
7096 | |
7097 | case BTRACE_FORMAT_BTS: | |
7098 | buffer_grow_str (buffer, "<!DOCTYPE btrace SYSTEM \"btrace.dtd\">\n"); | |
7099 | buffer_grow_str (buffer, "<btrace version=\"1.0\">\n"); | |
9accd112 | 7100 | |
46f29a9a | 7101 | for (const btrace_block &block : *btrace.variant.bts.blocks) |
734b0e4b | 7102 | buffer_xml_printf (buffer, "<block begin=\"0x%s\" end=\"0x%s\"/>\n", |
46f29a9a | 7103 | paddress (block.begin), paddress (block.end)); |
9accd112 | 7104 | |
734b0e4b MM |
7105 | buffer_grow_str0 (buffer, "</btrace>\n"); |
7106 | break; | |
7107 | ||
b20a6524 MM |
7108 | case BTRACE_FORMAT_PT: |
7109 | buffer_grow_str (buffer, "<!DOCTYPE btrace SYSTEM \"btrace.dtd\">\n"); | |
7110 | buffer_grow_str (buffer, "<btrace version=\"1.0\">\n"); | |
7111 | buffer_grow_str (buffer, "<pt>\n"); | |
7112 | ||
7113 | linux_low_encode_pt_config (buffer, &btrace.variant.pt.config); | |
9accd112 | 7114 | |
b20a6524 MM |
7115 | linux_low_encode_raw (buffer, btrace.variant.pt.data, |
7116 | btrace.variant.pt.size); | |
7117 | ||
7118 | buffer_grow_str (buffer, "</pt>\n"); | |
7119 | buffer_grow_str0 (buffer, "</btrace>\n"); | |
7120 | break; | |
7121 | ||
7122 | default: | |
7123 | buffer_grow_str0 (buffer, "E.Unsupported Trace Format."); | |
8dcc53b3 | 7124 | return -1; |
734b0e4b | 7125 | } |
969c39fb MM |
7126 | |
7127 | return 0; | |
9accd112 | 7128 | } |
f4abbc16 MM |
7129 | |
7130 | /* See to_btrace_conf target method. */ | |
7131 | ||
79597bdd TBA |
7132 | int |
7133 | linux_process_target::read_btrace_conf (const btrace_target_info *tinfo, | |
7134 | buffer *buffer) | |
f4abbc16 MM |
7135 | { |
7136 | const struct btrace_config *conf; | |
7137 | ||
7138 | buffer_grow_str (buffer, "<!DOCTYPE btrace-conf SYSTEM \"btrace-conf.dtd\">\n"); | |
7139 | buffer_grow_str (buffer, "<btrace-conf version=\"1.0\">\n"); | |
7140 | ||
7141 | conf = linux_btrace_conf (tinfo); | |
7142 | if (conf != NULL) | |
7143 | { | |
7144 | switch (conf->format) | |
7145 | { | |
7146 | case BTRACE_FORMAT_NONE: | |
7147 | break; | |
7148 | ||
7149 | case BTRACE_FORMAT_BTS: | |
d33501a5 MM |
7150 | buffer_xml_printf (buffer, "<bts"); |
7151 | buffer_xml_printf (buffer, " size=\"0x%x\"", conf->bts.size); | |
7152 | buffer_xml_printf (buffer, " />\n"); | |
f4abbc16 | 7153 | break; |
b20a6524 MM |
7154 | |
7155 | case BTRACE_FORMAT_PT: | |
7156 | buffer_xml_printf (buffer, "<pt"); | |
7157 | buffer_xml_printf (buffer, " size=\"0x%x\"", conf->pt.size); | |
7158 | buffer_xml_printf (buffer, "/>\n"); | |
7159 | break; | |
f4abbc16 MM |
7160 | } |
7161 | } | |
7162 | ||
7163 | buffer_grow_str0 (buffer, "</btrace-conf>\n"); | |
7164 | return 0; | |
7165 | } | |
9accd112 MM |
7166 | #endif /* HAVE_LINUX_BTRACE */ |
7167 | ||
7b669087 GB |
7168 | /* See nat/linux-nat.h. */ |
7169 | ||
7170 | ptid_t | |
7171 | current_lwp_ptid (void) | |
7172 | { | |
7173 | return ptid_of (current_thread); | |
7174 | } | |
7175 | ||
7f63b89b TBA |
7176 | const char * |
7177 | linux_process_target::thread_name (ptid_t thread) | |
7178 | { | |
7179 | return linux_proc_tid_get_name (thread); | |
7180 | } | |
7181 | ||
7182 | #if USE_THREAD_DB | |
7183 | bool | |
7184 | linux_process_target::thread_handle (ptid_t ptid, gdb_byte **handle, | |
7185 | int *handle_len) | |
7186 | { | |
7187 | return thread_db_thread_handle (ptid, handle, handle_len); | |
7188 | } | |
7189 | #endif | |
7190 | ||
276d4552 YQ |
7191 | /* Default implementation of linux_target_ops method "set_pc" for |
7192 | 32-bit pc register which is literally named "pc". */ | |
7193 | ||
7194 | void | |
7195 | linux_set_pc_32bit (struct regcache *regcache, CORE_ADDR pc) | |
7196 | { | |
7197 | uint32_t newpc = pc; | |
7198 | ||
7199 | supply_register_by_name (regcache, "pc", &newpc); | |
7200 | } | |
7201 | ||
7202 | /* Default implementation of linux_target_ops method "get_pc" for | |
7203 | 32-bit pc register which is literally named "pc". */ | |
7204 | ||
7205 | CORE_ADDR | |
7206 | linux_get_pc_32bit (struct regcache *regcache) | |
7207 | { | |
7208 | uint32_t pc; | |
7209 | ||
7210 | collect_register_by_name (regcache, "pc", &pc); | |
7211 | if (debug_threads) | |
7212 | debug_printf ("stop pc is 0x%" PRIx32 "\n", pc); | |
7213 | return pc; | |
7214 | } | |
7215 | ||
6f69e520 YQ |
7216 | /* Default implementation of linux_target_ops method "set_pc" for |
7217 | 64-bit pc register which is literally named "pc". */ | |
7218 | ||
7219 | void | |
7220 | linux_set_pc_64bit (struct regcache *regcache, CORE_ADDR pc) | |
7221 | { | |
7222 | uint64_t newpc = pc; | |
7223 | ||
7224 | supply_register_by_name (regcache, "pc", &newpc); | |
7225 | } | |
7226 | ||
7227 | /* Default implementation of linux_target_ops method "get_pc" for | |
7228 | 64-bit pc register which is literally named "pc". */ | |
7229 | ||
7230 | CORE_ADDR | |
7231 | linux_get_pc_64bit (struct regcache *regcache) | |
7232 | { | |
7233 | uint64_t pc; | |
7234 | ||
7235 | collect_register_by_name (regcache, "pc", &pc); | |
7236 | if (debug_threads) | |
7237 | debug_printf ("stop pc is 0x%" PRIx64 "\n", pc); | |
7238 | return pc; | |
7239 | } | |
7240 | ||
0570503d | 7241 | /* See linux-low.h. */ |
974c89e0 | 7242 | |
0570503d PFC |
7243 | int |
7244 | linux_get_auxv (int wordsize, CORE_ADDR match, CORE_ADDR *valp) | |
974c89e0 AH |
7245 | { |
7246 | gdb_byte *data = (gdb_byte *) alloca (2 * wordsize); | |
7247 | int offset = 0; | |
7248 | ||
7249 | gdb_assert (wordsize == 4 || wordsize == 8); | |
7250 | ||
52405d85 | 7251 | while (the_target->read_auxv (offset, data, 2 * wordsize) == 2 * wordsize) |
974c89e0 AH |
7252 | { |
7253 | if (wordsize == 4) | |
7254 | { | |
0570503d | 7255 | uint32_t *data_p = (uint32_t *) data; |
974c89e0 | 7256 | if (data_p[0] == match) |
0570503d PFC |
7257 | { |
7258 | *valp = data_p[1]; | |
7259 | return 1; | |
7260 | } | |
974c89e0 AH |
7261 | } |
7262 | else | |
7263 | { | |
0570503d | 7264 | uint64_t *data_p = (uint64_t *) data; |
974c89e0 | 7265 | if (data_p[0] == match) |
0570503d PFC |
7266 | { |
7267 | *valp = data_p[1]; | |
7268 | return 1; | |
7269 | } | |
974c89e0 AH |
7270 | } |
7271 | ||
7272 | offset += 2 * wordsize; | |
7273 | } | |
7274 | ||
7275 | return 0; | |
7276 | } | |
7277 | ||
7278 | /* See linux-low.h. */ | |
7279 | ||
7280 | CORE_ADDR | |
7281 | linux_get_hwcap (int wordsize) | |
7282 | { | |
0570503d PFC |
7283 | CORE_ADDR hwcap = 0; |
7284 | linux_get_auxv (wordsize, AT_HWCAP, &hwcap); | |
7285 | return hwcap; | |
974c89e0 AH |
7286 | } |
7287 | ||
7288 | /* See linux-low.h. */ | |
7289 | ||
7290 | CORE_ADDR | |
7291 | linux_get_hwcap2 (int wordsize) | |
7292 | { | |
0570503d PFC |
7293 | CORE_ADDR hwcap2 = 0; |
7294 | linux_get_auxv (wordsize, AT_HWCAP2, &hwcap2); | |
7295 | return hwcap2; | |
974c89e0 | 7296 | } |
6f69e520 | 7297 | |
3aee8918 PA |
7298 | #ifdef HAVE_LINUX_REGSETS |
7299 | void | |
7300 | initialize_regsets_info (struct regsets_info *info) | |
7301 | { | |
7302 | for (info->num_regsets = 0; | |
7303 | info->regsets[info->num_regsets].size >= 0; | |
7304 | info->num_regsets++) | |
7305 | ; | |
3aee8918 PA |
7306 | } |
7307 | #endif | |
7308 | ||
da6d8c04 DJ |
7309 | void |
7310 | initialize_low (void) | |
7311 | { | |
bd99dc85 | 7312 | struct sigaction sigchld_action; |
dd373349 | 7313 | |
bd99dc85 | 7314 | memset (&sigchld_action, 0, sizeof (sigchld_action)); |
ef0478f6 | 7315 | set_target_ops (the_linux_target); |
dd373349 | 7316 | |
aa7c7447 | 7317 | linux_ptrace_init_warnings (); |
1b919490 | 7318 | linux_proc_init_warnings (); |
bd99dc85 PA |
7319 | |
7320 | sigchld_action.sa_handler = sigchld_handler; | |
7321 | sigemptyset (&sigchld_action.sa_mask); | |
7322 | sigchld_action.sa_flags = SA_RESTART; | |
7323 | sigaction (SIGCHLD, &sigchld_action, NULL); | |
3aee8918 PA |
7324 | |
7325 | initialize_low_arch (); | |
89245bc0 DB |
7326 | |
7327 | linux_check_ptrace_features (); | |
da6d8c04 | 7328 | } |