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Commit | Line | Data |
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da6d8c04 | 1 | /* Low level interface to ptrace, for the remote server for GDB. |
1d506c26 | 2 | Copyright (C) 1995-2024 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" |
cdc8e9b2 JB |
24 | #include "gdbsupport/event-loop.h" |
25 | #include "gdbsupport/event-pipe.h" | |
268a13a5 TT |
26 | #include "gdbsupport/rsp-low.h" |
27 | #include "gdbsupport/signals-state-save-restore.h" | |
96d7229d LM |
28 | #include "nat/linux-nat.h" |
29 | #include "nat/linux-waitpid.h" | |
268a13a5 | 30 | #include "gdbsupport/gdb_wait.h" |
5826e159 | 31 | #include "nat/gdb_ptrace.h" |
125f8a3d GB |
32 | #include "nat/linux-ptrace.h" |
33 | #include "nat/linux-procfs.h" | |
8cc73a39 | 34 | #include "nat/linux-personality.h" |
da6d8c04 DJ |
35 | #include <signal.h> |
36 | #include <sys/ioctl.h> | |
37 | #include <fcntl.h> | |
0a30fbc4 | 38 | #include <unistd.h> |
fd500816 | 39 | #include <sys/syscall.h> |
f9387fc3 | 40 | #include <sched.h> |
07e059b5 VP |
41 | #include <pwd.h> |
42 | #include <sys/types.h> | |
43 | #include <dirent.h> | |
53ce3c39 | 44 | #include <sys/stat.h> |
efcbbd14 | 45 | #include <sys/vfs.h> |
1570b33e | 46 | #include <sys/uio.h> |
07b3255c TT |
47 | #include <langinfo.h> |
48 | #include <iconv.h> | |
268a13a5 | 49 | #include "gdbsupport/filestuff.h" |
07b3255c | 50 | #include "gdbsupport/gdb-safe-ctype.h" |
c144c7a0 | 51 | #include "tracepoint.h" |
276d4552 | 52 | #include <inttypes.h> |
268a13a5 | 53 | #include "gdbsupport/common-inferior.h" |
2090129c | 54 | #include "nat/fork-inferior.h" |
268a13a5 | 55 | #include "gdbsupport/environ.h" |
21987b9c | 56 | #include "gdbsupport/gdb-sigmask.h" |
268a13a5 | 57 | #include "gdbsupport/scoped_restore.h" |
957f3f49 DE |
58 | #ifndef ELFMAG0 |
59 | /* Don't include <linux/elf.h> here. If it got included by gdb_proc_service.h | |
60 | then ELFMAG0 will have been defined. If it didn't get included by | |
61 | gdb_proc_service.h then including it will likely introduce a duplicate | |
62 | definition of elf_fpregset_t. */ | |
63 | #include <elf.h> | |
64 | #endif | |
14d2069a | 65 | #include "nat/linux-namespaces.h" |
efcbbd14 | 66 | |
fd462a61 DJ |
67 | #ifndef O_LARGEFILE |
68 | #define O_LARGEFILE 0 | |
69 | #endif | |
1a981360 | 70 | |
69f4c9cc AH |
71 | #ifndef AT_HWCAP2 |
72 | #define AT_HWCAP2 26 | |
73 | #endif | |
74 | ||
db0dfaa0 LM |
75 | /* Some targets did not define these ptrace constants from the start, |
76 | so gdbserver defines them locally here. In the future, these may | |
77 | be removed after they are added to asm/ptrace.h. */ | |
78 | #if !(defined(PT_TEXT_ADDR) \ | |
79 | || defined(PT_DATA_ADDR) \ | |
80 | || defined(PT_TEXT_END_ADDR)) | |
81 | #if defined(__mcoldfire__) | |
82 | /* These are still undefined in 3.10 kernels. */ | |
83 | #define PT_TEXT_ADDR 49*4 | |
84 | #define PT_DATA_ADDR 50*4 | |
85 | #define PT_TEXT_END_ADDR 51*4 | |
db0dfaa0 LM |
86 | /* These are still undefined in 3.10 kernels. */ |
87 | #elif defined(__TMS320C6X__) | |
88 | #define PT_TEXT_ADDR (0x10000*4) | |
89 | #define PT_DATA_ADDR (0x10004*4) | |
90 | #define PT_TEXT_END_ADDR (0x10008*4) | |
91 | #endif | |
92 | #endif | |
93 | ||
5203ae1e TBA |
94 | #if (defined(__UCLIBC__) \ |
95 | && defined(HAS_NOMMU) \ | |
96 | && defined(PT_TEXT_ADDR) \ | |
97 | && defined(PT_DATA_ADDR) \ | |
98 | && defined(PT_TEXT_END_ADDR)) | |
99 | #define SUPPORTS_READ_OFFSETS | |
100 | #endif | |
101 | ||
9accd112 | 102 | #ifdef HAVE_LINUX_BTRACE |
125f8a3d | 103 | # include "nat/linux-btrace.h" |
268a13a5 | 104 | # include "gdbsupport/btrace-common.h" |
9accd112 MM |
105 | #endif |
106 | ||
8365dcf5 TJB |
107 | #ifndef HAVE_ELF32_AUXV_T |
108 | /* Copied from glibc's elf.h. */ | |
109 | typedef struct | |
110 | { | |
111 | uint32_t a_type; /* Entry type */ | |
112 | union | |
113 | { | |
114 | uint32_t a_val; /* Integer value */ | |
115 | /* We use to have pointer elements added here. We cannot do that, | |
116 | though, since it does not work when using 32-bit definitions | |
117 | on 64-bit platforms and vice versa. */ | |
118 | } a_un; | |
119 | } Elf32_auxv_t; | |
120 | #endif | |
121 | ||
122 | #ifndef HAVE_ELF64_AUXV_T | |
123 | /* Copied from glibc's elf.h. */ | |
124 | typedef struct | |
125 | { | |
126 | uint64_t a_type; /* Entry type */ | |
127 | union | |
128 | { | |
129 | uint64_t a_val; /* Integer value */ | |
130 | /* We use to have pointer elements added here. We cannot do that, | |
131 | though, since it does not work when using 32-bit definitions | |
132 | on 64-bit platforms and vice versa. */ | |
133 | } a_un; | |
134 | } Elf64_auxv_t; | |
135 | #endif | |
136 | ||
ded48a5e | 137 | /* Does the current host support PTRACE_GETREGSET? */ |
5920765d | 138 | enum tribool have_ptrace_getregset = TRIBOOL_UNKNOWN; |
ded48a5e | 139 | |
8a841a35 PA |
140 | /* Return TRUE if THREAD is the leader thread of the process. */ |
141 | ||
142 | static bool | |
143 | is_leader (thread_info *thread) | |
144 | { | |
145 | ptid_t ptid = ptid_of (thread); | |
146 | return ptid.pid () == ptid.lwp (); | |
147 | } | |
148 | ||
48989498 PA |
149 | /* Return true if we should report thread exit events to GDB, for |
150 | THR. */ | |
151 | ||
152 | static bool | |
153 | report_exit_events_for (thread_info *thr) | |
154 | { | |
155 | client_state &cs = get_client_state (); | |
156 | ||
157 | return (cs.report_thread_events | |
158 | || (thr->thread_options & GDB_THREAD_OPTION_EXIT) != 0); | |
159 | } | |
160 | ||
cff068da GB |
161 | /* LWP accessors. */ |
162 | ||
163 | /* See nat/linux-nat.h. */ | |
164 | ||
165 | ptid_t | |
166 | ptid_of_lwp (struct lwp_info *lwp) | |
167 | { | |
168 | return ptid_of (get_lwp_thread (lwp)); | |
169 | } | |
170 | ||
171 | /* See nat/linux-nat.h. */ | |
172 | ||
4b134ca1 GB |
173 | void |
174 | lwp_set_arch_private_info (struct lwp_info *lwp, | |
175 | struct arch_lwp_info *info) | |
176 | { | |
177 | lwp->arch_private = info; | |
178 | } | |
179 | ||
180 | /* See nat/linux-nat.h. */ | |
181 | ||
182 | struct arch_lwp_info * | |
183 | lwp_arch_private_info (struct lwp_info *lwp) | |
184 | { | |
185 | return lwp->arch_private; | |
186 | } | |
187 | ||
188 | /* See nat/linux-nat.h. */ | |
189 | ||
cff068da GB |
190 | int |
191 | lwp_is_stopped (struct lwp_info *lwp) | |
192 | { | |
193 | return lwp->stopped; | |
194 | } | |
195 | ||
196 | /* See nat/linux-nat.h. */ | |
197 | ||
198 | enum target_stop_reason | |
199 | lwp_stop_reason (struct lwp_info *lwp) | |
200 | { | |
201 | return lwp->stop_reason; | |
202 | } | |
203 | ||
0e00e962 AA |
204 | /* See nat/linux-nat.h. */ |
205 | ||
206 | int | |
207 | lwp_is_stepping (struct lwp_info *lwp) | |
208 | { | |
209 | return lwp->stepping; | |
210 | } | |
211 | ||
05044653 PA |
212 | /* A list of all unknown processes which receive stop signals. Some |
213 | other process will presumably claim each of these as forked | |
214 | children momentarily. */ | |
24a09b5f | 215 | |
05044653 PA |
216 | struct simple_pid_list |
217 | { | |
218 | /* The process ID. */ | |
219 | int pid; | |
220 | ||
221 | /* The status as reported by waitpid. */ | |
222 | int status; | |
223 | ||
224 | /* Next in chain. */ | |
225 | struct simple_pid_list *next; | |
226 | }; | |
05c309a8 | 227 | static struct simple_pid_list *stopped_pids; |
05044653 PA |
228 | |
229 | /* Trivial list manipulation functions to keep track of a list of new | |
230 | stopped processes. */ | |
231 | ||
232 | static void | |
233 | add_to_pid_list (struct simple_pid_list **listp, int pid, int status) | |
234 | { | |
8d749320 | 235 | struct simple_pid_list *new_pid = XNEW (struct simple_pid_list); |
05044653 PA |
236 | |
237 | new_pid->pid = pid; | |
238 | new_pid->status = status; | |
239 | new_pid->next = *listp; | |
240 | *listp = new_pid; | |
241 | } | |
242 | ||
243 | static int | |
244 | pull_pid_from_list (struct simple_pid_list **listp, int pid, int *statusp) | |
245 | { | |
246 | struct simple_pid_list **p; | |
247 | ||
248 | for (p = listp; *p != NULL; p = &(*p)->next) | |
249 | if ((*p)->pid == pid) | |
250 | { | |
251 | struct simple_pid_list *next = (*p)->next; | |
252 | ||
253 | *statusp = (*p)->status; | |
254 | xfree (*p); | |
255 | *p = next; | |
256 | return 1; | |
257 | } | |
258 | return 0; | |
259 | } | |
24a09b5f | 260 | |
bde24c0a PA |
261 | enum stopping_threads_kind |
262 | { | |
263 | /* Not stopping threads presently. */ | |
264 | NOT_STOPPING_THREADS, | |
265 | ||
266 | /* Stopping threads. */ | |
267 | STOPPING_THREADS, | |
268 | ||
269 | /* Stopping and suspending threads. */ | |
270 | STOPPING_AND_SUSPENDING_THREADS | |
271 | }; | |
272 | ||
273 | /* This is set while stop_all_lwps is in effect. */ | |
6bd434d6 | 274 | static stopping_threads_kind stopping_threads = NOT_STOPPING_THREADS; |
0d62e5e8 DJ |
275 | |
276 | /* FIXME make into a target method? */ | |
24a09b5f | 277 | int using_threads = 1; |
24a09b5f | 278 | |
fa593d66 PA |
279 | /* True if we're presently stabilizing threads (moving them out of |
280 | jump pads). */ | |
281 | static int stabilizing_threads; | |
282 | ||
f50bf8e5 | 283 | static void unsuspend_all_lwps (struct lwp_info *except); |
e8a625d1 PA |
284 | static void mark_lwp_dead (struct lwp_info *lwp, int wstat, |
285 | bool thread_event); | |
00db26fa | 286 | static int lwp_is_marked_dead (struct lwp_info *lwp); |
d50171e4 | 287 | static int kill_lwp (unsigned long lwpid, int signo); |
863d01bd | 288 | static void enqueue_pending_signal (struct lwp_info *lwp, int signal, siginfo_t *info); |
ece66d65 | 289 | static int linux_low_ptrace_options (int attached); |
ced2dffb | 290 | static int check_ptrace_stopped_lwp_gone (struct lwp_info *lp); |
d50171e4 | 291 | |
582511be PA |
292 | /* When the event-loop is doing a step-over, this points at the thread |
293 | being stepped. */ | |
6bd434d6 | 294 | static ptid_t step_over_bkpt; |
582511be | 295 | |
bf9ae9d8 TBA |
296 | bool |
297 | linux_process_target::low_supports_breakpoints () | |
298 | { | |
299 | return false; | |
300 | } | |
d50171e4 | 301 | |
bf9ae9d8 TBA |
302 | CORE_ADDR |
303 | linux_process_target::low_get_pc (regcache *regcache) | |
304 | { | |
305 | return 0; | |
306 | } | |
307 | ||
308 | void | |
309 | linux_process_target::low_set_pc (regcache *regcache, CORE_ADDR newpc) | |
d50171e4 | 310 | { |
bf9ae9d8 | 311 | gdb_assert_not_reached ("linux target op low_set_pc is not implemented"); |
d50171e4 | 312 | } |
0d62e5e8 | 313 | |
7582c77c TBA |
314 | std::vector<CORE_ADDR> |
315 | linux_process_target::low_get_next_pcs (regcache *regcache) | |
316 | { | |
317 | gdb_assert_not_reached ("linux target op low_get_next_pcs is not " | |
318 | "implemented"); | |
319 | } | |
320 | ||
d4807ea2 TBA |
321 | int |
322 | linux_process_target::low_decr_pc_after_break () | |
323 | { | |
324 | return 0; | |
325 | } | |
326 | ||
c2d6af84 PA |
327 | /* True if LWP is stopped in its stepping range. */ |
328 | ||
329 | static int | |
330 | lwp_in_step_range (struct lwp_info *lwp) | |
331 | { | |
332 | CORE_ADDR pc = lwp->stop_pc; | |
333 | ||
334 | return (pc >= lwp->step_range_start && pc < lwp->step_range_end); | |
335 | } | |
336 | ||
cdc8e9b2 JB |
337 | /* The event pipe registered as a waitable file in the event loop. */ |
338 | static event_pipe linux_event_pipe; | |
bd99dc85 PA |
339 | |
340 | /* True if we're currently in async mode. */ | |
cdc8e9b2 | 341 | #define target_is_async_p() (linux_event_pipe.is_open ()) |
bd99dc85 | 342 | |
02fc4de7 | 343 | static void send_sigstop (struct lwp_info *lwp); |
bd99dc85 | 344 | |
d0722149 DE |
345 | /* Return non-zero if HEADER is a 64-bit ELF file. */ |
346 | ||
347 | static int | |
214d508e | 348 | elf_64_header_p (const Elf64_Ehdr *header, unsigned int *machine) |
d0722149 | 349 | { |
214d508e L |
350 | if (header->e_ident[EI_MAG0] == ELFMAG0 |
351 | && header->e_ident[EI_MAG1] == ELFMAG1 | |
352 | && header->e_ident[EI_MAG2] == ELFMAG2 | |
353 | && header->e_ident[EI_MAG3] == ELFMAG3) | |
354 | { | |
355 | *machine = header->e_machine; | |
356 | return header->e_ident[EI_CLASS] == ELFCLASS64; | |
357 | ||
358 | } | |
359 | *machine = EM_NONE; | |
360 | return -1; | |
d0722149 DE |
361 | } |
362 | ||
363 | /* Return non-zero if FILE is a 64-bit ELF file, | |
364 | zero if the file is not a 64-bit ELF file, | |
365 | and -1 if the file is not accessible or doesn't exist. */ | |
366 | ||
be07f1a2 | 367 | static int |
214d508e | 368 | elf_64_file_p (const char *file, unsigned int *machine) |
d0722149 | 369 | { |
957f3f49 | 370 | Elf64_Ehdr header; |
d0722149 DE |
371 | int fd; |
372 | ||
373 | fd = open (file, O_RDONLY); | |
374 | if (fd < 0) | |
375 | return -1; | |
376 | ||
377 | if (read (fd, &header, sizeof (header)) != sizeof (header)) | |
378 | { | |
379 | close (fd); | |
380 | return 0; | |
381 | } | |
382 | close (fd); | |
383 | ||
214d508e | 384 | return elf_64_header_p (&header, machine); |
d0722149 DE |
385 | } |
386 | ||
be07f1a2 PA |
387 | /* Accepts an integer PID; Returns true if the executable PID is |
388 | running is a 64-bit ELF file.. */ | |
389 | ||
390 | int | |
214d508e | 391 | linux_pid_exe_is_elf_64_file (int pid, unsigned int *machine) |
be07f1a2 | 392 | { |
d8d2a3ee | 393 | char file[PATH_MAX]; |
be07f1a2 PA |
394 | |
395 | sprintf (file, "/proc/%d/exe", pid); | |
214d508e | 396 | return elf_64_file_p (file, machine); |
be07f1a2 PA |
397 | } |
398 | ||
fd000fb3 TBA |
399 | void |
400 | linux_process_target::delete_lwp (lwp_info *lwp) | |
bd99dc85 | 401 | { |
fa96cb38 PA |
402 | struct thread_info *thr = get_lwp_thread (lwp); |
403 | ||
c058728c | 404 | threads_debug_printf ("deleting %ld", lwpid_of (thr)); |
fa96cb38 PA |
405 | |
406 | remove_thread (thr); | |
466eecee | 407 | |
fd000fb3 | 408 | low_delete_thread (lwp->arch_private); |
466eecee | 409 | |
013e3554 | 410 | delete lwp; |
bd99dc85 PA |
411 | } |
412 | ||
fd000fb3 TBA |
413 | void |
414 | linux_process_target::low_delete_thread (arch_lwp_info *info) | |
415 | { | |
416 | /* Default implementation should be overridden if architecture-specific | |
417 | info is being used. */ | |
418 | gdb_assert (info == nullptr); | |
419 | } | |
95954743 | 420 | |
421490af PA |
421 | /* Open the /proc/PID/mem file for PROC. */ |
422 | ||
423 | static void | |
424 | open_proc_mem_file (process_info *proc) | |
425 | { | |
426 | gdb_assert (proc->priv->mem_fd == -1); | |
427 | ||
428 | char filename[64]; | |
429 | xsnprintf (filename, sizeof filename, "/proc/%d/mem", proc->pid); | |
430 | ||
431 | proc->priv->mem_fd | |
432 | = gdb_open_cloexec (filename, O_RDWR | O_LARGEFILE, 0).release (); | |
433 | } | |
434 | ||
fd000fb3 | 435 | process_info * |
421490af | 436 | linux_process_target::add_linux_process_no_mem_file (int pid, int attached) |
95954743 PA |
437 | { |
438 | struct process_info *proc; | |
439 | ||
95954743 | 440 | proc = add_process (pid, attached); |
8d749320 | 441 | proc->priv = XCNEW (struct process_info_private); |
95954743 | 442 | |
fd000fb3 | 443 | proc->priv->arch_private = low_new_process (); |
421490af PA |
444 | proc->priv->mem_fd = -1; |
445 | ||
446 | return proc; | |
447 | } | |
448 | ||
aa5ca48f | 449 | |
421490af PA |
450 | process_info * |
451 | linux_process_target::add_linux_process (int pid, int attached) | |
452 | { | |
453 | process_info *proc = add_linux_process_no_mem_file (pid, attached); | |
454 | open_proc_mem_file (proc); | |
95954743 PA |
455 | return proc; |
456 | } | |
457 | ||
f551c8ef SM |
458 | void |
459 | linux_process_target::remove_linux_process (process_info *proc) | |
460 | { | |
461 | if (proc->priv->mem_fd >= 0) | |
462 | close (proc->priv->mem_fd); | |
463 | ||
464 | this->low_delete_process (proc->priv->arch_private); | |
465 | ||
466 | xfree (proc->priv); | |
467 | proc->priv = nullptr; | |
468 | ||
469 | remove_process (proc); | |
470 | } | |
471 | ||
fd000fb3 TBA |
472 | arch_process_info * |
473 | linux_process_target::low_new_process () | |
474 | { | |
475 | return nullptr; | |
476 | } | |
477 | ||
478 | void | |
479 | linux_process_target::low_delete_process (arch_process_info *info) | |
480 | { | |
481 | /* Default implementation must be overridden if architecture-specific | |
482 | info exists. */ | |
483 | gdb_assert (info == nullptr); | |
484 | } | |
485 | ||
486 | void | |
487 | linux_process_target::low_new_fork (process_info *parent, process_info *child) | |
488 | { | |
489 | /* Nop. */ | |
490 | } | |
491 | ||
797bcff5 TBA |
492 | void |
493 | linux_process_target::arch_setup_thread (thread_info *thread) | |
94585166 | 494 | { |
24583e45 TBA |
495 | scoped_restore_current_thread restore_thread; |
496 | switch_to_thread (thread); | |
94585166 | 497 | |
797bcff5 | 498 | low_arch_setup (); |
94585166 DB |
499 | } |
500 | ||
d16f3f6c TBA |
501 | int |
502 | linux_process_target::handle_extended_wait (lwp_info **orig_event_lwp, | |
503 | int wstat) | |
24a09b5f | 504 | { |
c12a5089 | 505 | client_state &cs = get_client_state (); |
94585166 | 506 | struct lwp_info *event_lwp = *orig_event_lwp; |
89a5711c | 507 | int event = linux_ptrace_get_extended_event (wstat); |
de0d863e | 508 | struct thread_info *event_thr = get_lwp_thread (event_lwp); |
24a09b5f | 509 | |
183be222 | 510 | gdb_assert (event_lwp->waitstatus.kind () == TARGET_WAITKIND_IGNORE); |
65706a29 | 511 | |
82075af2 JS |
512 | /* All extended events we currently use are mid-syscall. Only |
513 | PTRACE_EVENT_STOP is delivered more like a signal-stop, but | |
514 | you have to be using PTRACE_SEIZE to get that. */ | |
515 | event_lwp->syscall_state = TARGET_WAITKIND_SYSCALL_ENTRY; | |
516 | ||
c269dbdb DB |
517 | if ((event == PTRACE_EVENT_FORK) || (event == PTRACE_EVENT_VFORK) |
518 | || (event == PTRACE_EVENT_CLONE)) | |
24a09b5f DJ |
519 | { |
520 | unsigned long new_pid; | |
05044653 | 521 | int ret, status; |
24a09b5f | 522 | |
de0d863e | 523 | /* Get the pid of the new lwp. */ |
d86d4aaf | 524 | ptrace (PTRACE_GETEVENTMSG, lwpid_of (event_thr), (PTRACE_TYPE_ARG3) 0, |
56f7af9c | 525 | &new_pid); |
24a09b5f DJ |
526 | |
527 | /* If we haven't already seen the new PID stop, wait for it now. */ | |
05044653 | 528 | if (!pull_pid_from_list (&stopped_pids, new_pid, &status)) |
24a09b5f DJ |
529 | { |
530 | /* The new child has a pending SIGSTOP. We can't affect it until it | |
531 | hits the SIGSTOP, but we're already attached. */ | |
532 | ||
97438e3f | 533 | ret = my_waitpid (new_pid, &status, __WALL); |
24a09b5f DJ |
534 | |
535 | if (ret == -1) | |
536 | perror_with_name ("waiting for new child"); | |
537 | else if (ret != new_pid) | |
538 | warning ("wait returned unexpected PID %d", ret); | |
da5898ce | 539 | else if (!WIFSTOPPED (status)) |
24a09b5f DJ |
540 | warning ("wait returned unexpected status 0x%x", status); |
541 | } | |
542 | ||
393a6b59 | 543 | if (debug_threads) |
de0d863e | 544 | { |
393a6b59 PA |
545 | debug_printf ("HEW: Got %s event from LWP %ld, new child is %ld\n", |
546 | (event == PTRACE_EVENT_FORK ? "fork" | |
547 | : event == PTRACE_EVENT_VFORK ? "vfork" | |
548 | : event == PTRACE_EVENT_CLONE ? "clone" | |
549 | : "???"), | |
550 | ptid_of (event_thr).lwp (), | |
551 | new_pid); | |
552 | } | |
553 | ||
554 | ptid_t child_ptid = (event != PTRACE_EVENT_CLONE | |
555 | ? ptid_t (new_pid, new_pid) | |
556 | : ptid_t (ptid_of (event_thr).pid (), new_pid)); | |
de0d863e | 557 | |
38065394 PA |
558 | process_info *child_proc = nullptr; |
559 | ||
560 | if (event != PTRACE_EVENT_CLONE) | |
561 | { | |
562 | /* Add the new process to the tables before we add the LWP. | |
563 | We need to do this even if the new process will be | |
564 | detached. See breakpoint cloning code further below. */ | |
565 | child_proc = add_linux_process (new_pid, 0); | |
566 | } | |
567 | ||
393a6b59 PA |
568 | lwp_info *child_lwp = add_lwp (child_ptid); |
569 | gdb_assert (child_lwp != NULL); | |
570 | child_lwp->stopped = 1; | |
571 | if (event != PTRACE_EVENT_CLONE) | |
572 | child_lwp->must_set_ptrace_flags = 1; | |
573 | child_lwp->status_pending_p = 0; | |
de0d863e | 574 | |
393a6b59 | 575 | thread_info *child_thr = get_lwp_thread (child_lwp); |
de0d863e | 576 | |
393a6b59 PA |
577 | /* If we're suspending all threads, leave this one suspended |
578 | too. If the fork/clone parent is stepping over a breakpoint, | |
579 | all other threads have been suspended already. Leave the | |
580 | child suspended too. */ | |
581 | if (stopping_threads == STOPPING_AND_SUSPENDING_THREADS | |
582 | || event_lwp->bp_reinsert != 0) | |
583 | { | |
584 | threads_debug_printf ("leaving child suspended"); | |
585 | child_lwp->suspended = 1; | |
586 | } | |
587 | ||
588 | if (event_lwp->bp_reinsert != 0 | |
589 | && supports_software_single_step () | |
590 | && event == PTRACE_EVENT_VFORK) | |
591 | { | |
592 | /* If we leave single-step breakpoints there, child will | |
593 | hit it, so uninsert single-step breakpoints from parent | |
594 | (and child). Once vfork child is done, reinsert | |
595 | them back to parent. */ | |
596 | uninsert_single_step_breakpoints (event_thr); | |
597 | } | |
598 | ||
599 | if (event != PTRACE_EVENT_CLONE) | |
600 | { | |
38065394 PA |
601 | /* Clone the breakpoint lists of the parent. We need to do |
602 | this even if the new process will be detached, since we | |
603 | will need the process object and the breakpoints to | |
604 | remove any breakpoints from memory when we detach, and | |
605 | the client side will access registers. */ | |
de0d863e | 606 | gdb_assert (child_proc != NULL); |
863d01bd | 607 | |
393a6b59 | 608 | process_info *parent_proc = get_thread_process (event_thr); |
de0d863e | 609 | child_proc->attached = parent_proc->attached; |
2e7b624b | 610 | |
63c40ec7 | 611 | clone_all_breakpoints (child_thr, event_thr); |
de0d863e | 612 | |
51a948fd AB |
613 | target_desc_up tdesc = allocate_target_description (); |
614 | copy_target_description (tdesc.get (), parent_proc->tdesc); | |
615 | child_proc->tdesc = tdesc.release (); | |
de0d863e | 616 | |
3a8a0396 | 617 | /* Clone arch-specific process data. */ |
fd000fb3 | 618 | low_new_fork (parent_proc, child_proc); |
393a6b59 | 619 | } |
3a8a0396 | 620 | |
393a6b59 PA |
621 | /* Save fork/clone info in the parent thread. */ |
622 | if (event == PTRACE_EVENT_FORK) | |
623 | event_lwp->waitstatus.set_forked (child_ptid); | |
624 | else if (event == PTRACE_EVENT_VFORK) | |
625 | event_lwp->waitstatus.set_vforked (child_ptid); | |
626 | else if (event == PTRACE_EVENT_CLONE | |
627 | && (event_thr->thread_options & GDB_THREAD_OPTION_CLONE) != 0) | |
628 | event_lwp->waitstatus.set_thread_cloned (child_ptid); | |
629 | ||
630 | if (event != PTRACE_EVENT_CLONE | |
631 | || (event_thr->thread_options & GDB_THREAD_OPTION_CLONE) != 0) | |
632 | { | |
de0d863e | 633 | /* The status_pending field contains bits denoting the |
393a6b59 PA |
634 | extended event, so when the pending event is handled, the |
635 | handler will look at lwp->waitstatus. */ | |
de0d863e DB |
636 | event_lwp->status_pending_p = 1; |
637 | event_lwp->status_pending = wstat; | |
638 | ||
393a6b59 PA |
639 | /* Link the threads until the parent's event is passed on to |
640 | GDB. */ | |
641 | event_lwp->relative = child_lwp; | |
642 | child_lwp->relative = event_lwp; | |
de0d863e DB |
643 | } |
644 | ||
393a6b59 PA |
645 | /* If the parent thread is doing step-over with single-step |
646 | breakpoints, the list of single-step breakpoints are cloned | |
647 | from the parent's. Remove them from the child process. | |
648 | In case of vfork, we'll reinsert them back once vforked | |
649 | child is done. */ | |
650 | if (event_lwp->bp_reinsert != 0 | |
651 | && supports_software_single_step ()) | |
652 | { | |
653 | /* The child process is forked and stopped, so it is safe | |
654 | to access its memory without stopping all other threads | |
655 | from other processes. */ | |
656 | delete_single_step_breakpoints (child_thr); | |
e27d73f6 | 657 | |
393a6b59 PA |
658 | gdb_assert (has_single_step_breakpoints (event_thr)); |
659 | gdb_assert (!has_single_step_breakpoints (child_thr)); | |
660 | } | |
bde24c0a | 661 | |
da5898ce DJ |
662 | /* Normally we will get the pending SIGSTOP. But in some cases |
663 | we might get another signal delivered to the group first. | |
f21cc1a2 | 664 | If we do get another signal, be sure not to lose it. */ |
20ba1ce6 | 665 | if (WSTOPSIG (status) != SIGSTOP) |
da5898ce | 666 | { |
393a6b59 PA |
667 | child_lwp->stop_expected = 1; |
668 | child_lwp->status_pending_p = 1; | |
669 | child_lwp->status_pending = status; | |
da5898ce | 670 | } |
393a6b59 | 671 | else if (event == PTRACE_EVENT_CLONE && cs.report_thread_events) |
65706a29 | 672 | { |
393a6b59 PA |
673 | child_lwp->waitstatus.set_thread_created (); |
674 | child_lwp->status_pending_p = 1; | |
675 | child_lwp->status_pending = status; | |
65706a29 | 676 | } |
de0d863e | 677 | |
393a6b59 PA |
678 | if (event == PTRACE_EVENT_CLONE) |
679 | { | |
a0aad537 | 680 | #ifdef USE_THREAD_DB |
393a6b59 | 681 | thread_db_notice_clone (event_thr, child_ptid); |
a0aad537 | 682 | #endif |
393a6b59 | 683 | } |
86299109 | 684 | |
393a6b59 PA |
685 | if (event == PTRACE_EVENT_CLONE |
686 | && (event_thr->thread_options & GDB_THREAD_OPTION_CLONE) == 0) | |
687 | { | |
688 | threads_debug_printf | |
689 | ("not reporting clone event from LWP %ld, new child is %ld\n", | |
690 | ptid_of (event_thr).lwp (), | |
691 | new_pid); | |
692 | return 1; | |
693 | } | |
694 | ||
695 | /* Leave the child stopped until GDB processes the parent | |
696 | event. */ | |
697 | child_thr->last_resume_kind = resume_stop; | |
698 | child_thr->last_status.set_stopped (GDB_SIGNAL_0); | |
699 | ||
700 | /* Report the event. */ | |
701 | threads_debug_printf | |
702 | ("reporting %s event from LWP %ld, new child is %ld\n", | |
703 | (event == PTRACE_EVENT_FORK ? "fork" | |
704 | : event == PTRACE_EVENT_VFORK ? "vfork" | |
705 | : event == PTRACE_EVENT_CLONE ? "clone" | |
706 | : "???"), | |
707 | ptid_of (event_thr).lwp (), | |
708 | new_pid); | |
709 | return 0; | |
24a09b5f | 710 | } |
c269dbdb DB |
711 | else if (event == PTRACE_EVENT_VFORK_DONE) |
712 | { | |
183be222 | 713 | event_lwp->waitstatus.set_vfork_done (); |
c269dbdb | 714 | |
7582c77c | 715 | if (event_lwp->bp_reinsert != 0 && supports_software_single_step ()) |
2e7b624b | 716 | { |
3b9a79ef | 717 | reinsert_single_step_breakpoints (event_thr); |
2e7b624b | 718 | |
3b9a79ef | 719 | gdb_assert (has_single_step_breakpoints (event_thr)); |
2e7b624b YQ |
720 | } |
721 | ||
c269dbdb DB |
722 | /* Report the event. */ |
723 | return 0; | |
724 | } | |
c12a5089 | 725 | else if (event == PTRACE_EVENT_EXEC && cs.report_exec_events) |
94585166 DB |
726 | { |
727 | struct process_info *proc; | |
f27866ba | 728 | std::vector<int> syscalls_to_catch; |
94585166 DB |
729 | ptid_t event_ptid; |
730 | pid_t event_pid; | |
731 | ||
c058728c SM |
732 | threads_debug_printf ("Got exec event from LWP %ld", |
733 | lwpid_of (event_thr)); | |
94585166 DB |
734 | |
735 | /* Get the event ptid. */ | |
736 | event_ptid = ptid_of (event_thr); | |
e99b03dc | 737 | event_pid = event_ptid.pid (); |
94585166 | 738 | |
82075af2 | 739 | /* Save the syscall list from the execing process. */ |
94585166 | 740 | proc = get_thread_process (event_thr); |
f27866ba | 741 | syscalls_to_catch = std::move (proc->syscalls_to_catch); |
82075af2 JS |
742 | |
743 | /* Delete the execing process and all its threads. */ | |
d16f3f6c | 744 | mourn (proc); |
24583e45 | 745 | switch_to_thread (nullptr); |
94585166 DB |
746 | |
747 | /* Create a new process/lwp/thread. */ | |
fd000fb3 | 748 | proc = add_linux_process (event_pid, 0); |
94585166 DB |
749 | event_lwp = add_lwp (event_ptid); |
750 | event_thr = get_lwp_thread (event_lwp); | |
751 | gdb_assert (current_thread == event_thr); | |
797bcff5 | 752 | arch_setup_thread (event_thr); |
94585166 DB |
753 | |
754 | /* Set the event status. */ | |
183be222 SM |
755 | event_lwp->waitstatus.set_execd |
756 | (make_unique_xstrdup | |
757 | (linux_proc_pid_to_exec_file (lwpid_of (event_thr)))); | |
94585166 DB |
758 | |
759 | /* Mark the exec status as pending. */ | |
760 | event_lwp->stopped = 1; | |
761 | event_lwp->status_pending_p = 1; | |
762 | event_lwp->status_pending = wstat; | |
763 | event_thr->last_resume_kind = resume_continue; | |
183be222 | 764 | event_thr->last_status.set_ignore (); |
94585166 | 765 | |
82075af2 JS |
766 | /* Update syscall state in the new lwp, effectively mid-syscall too. */ |
767 | event_lwp->syscall_state = TARGET_WAITKIND_SYSCALL_ENTRY; | |
768 | ||
769 | /* Restore the list to catch. Don't rely on the client, which is free | |
770 | to avoid sending a new list when the architecture doesn't change. | |
771 | Also, for ANY_SYSCALL, the architecture doesn't really matter. */ | |
f27866ba | 772 | proc->syscalls_to_catch = std::move (syscalls_to_catch); |
82075af2 | 773 | |
94585166 DB |
774 | /* Report the event. */ |
775 | *orig_event_lwp = event_lwp; | |
776 | return 0; | |
777 | } | |
de0d863e | 778 | |
f34652de | 779 | internal_error (_("unknown ptrace event %d"), event); |
24a09b5f DJ |
780 | } |
781 | ||
df95181f TBA |
782 | CORE_ADDR |
783 | linux_process_target::get_pc (lwp_info *lwp) | |
d50171e4 | 784 | { |
a9deee17 PA |
785 | process_info *proc = get_thread_process (get_lwp_thread (lwp)); |
786 | gdb_assert (!proc->starting_up); | |
d50171e4 | 787 | |
bf9ae9d8 | 788 | if (!low_supports_breakpoints ()) |
d50171e4 PA |
789 | return 0; |
790 | ||
24583e45 TBA |
791 | scoped_restore_current_thread restore_thread; |
792 | switch_to_thread (get_lwp_thread (lwp)); | |
d50171e4 | 793 | |
a9deee17 PA |
794 | struct regcache *regcache = get_thread_regcache (current_thread, 1); |
795 | CORE_ADDR pc = low_get_pc (regcache); | |
d50171e4 | 796 | |
c058728c | 797 | threads_debug_printf ("pc is 0x%lx", (long) pc); |
d50171e4 | 798 | |
d50171e4 PA |
799 | return pc; |
800 | } | |
801 | ||
9eedd27d TBA |
802 | void |
803 | linux_process_target::get_syscall_trapinfo (lwp_info *lwp, int *sysno) | |
82075af2 | 804 | { |
82075af2 JS |
805 | struct regcache *regcache; |
806 | ||
24583e45 TBA |
807 | scoped_restore_current_thread restore_thread; |
808 | switch_to_thread (get_lwp_thread (lwp)); | |
82075af2 JS |
809 | |
810 | regcache = get_thread_regcache (current_thread, 1); | |
9eedd27d | 811 | low_get_syscall_trapinfo (regcache, sysno); |
82075af2 | 812 | |
c058728c | 813 | threads_debug_printf ("get_syscall_trapinfo sysno %d", *sysno); |
82075af2 JS |
814 | } |
815 | ||
9eedd27d TBA |
816 | void |
817 | linux_process_target::low_get_syscall_trapinfo (regcache *regcache, int *sysno) | |
818 | { | |
819 | /* By default, report an unknown system call number. */ | |
820 | *sysno = UNKNOWN_SYSCALL; | |
821 | } | |
822 | ||
df95181f TBA |
823 | bool |
824 | linux_process_target::save_stop_reason (lwp_info *lwp) | |
0d62e5e8 | 825 | { |
582511be PA |
826 | CORE_ADDR pc; |
827 | CORE_ADDR sw_breakpoint_pc; | |
3e572f71 PA |
828 | #if USE_SIGTRAP_SIGINFO |
829 | siginfo_t siginfo; | |
830 | #endif | |
d50171e4 | 831 | |
bf9ae9d8 | 832 | if (!low_supports_breakpoints ()) |
df95181f | 833 | return false; |
0d62e5e8 | 834 | |
a9deee17 PA |
835 | process_info *proc = get_thread_process (get_lwp_thread (lwp)); |
836 | if (proc->starting_up) | |
837 | { | |
838 | /* Claim we have the stop PC so that the caller doesn't try to | |
839 | fetch it itself. */ | |
840 | return true; | |
841 | } | |
842 | ||
582511be | 843 | pc = get_pc (lwp); |
d4807ea2 | 844 | sw_breakpoint_pc = pc - low_decr_pc_after_break (); |
d50171e4 | 845 | |
582511be | 846 | /* breakpoint_at reads from the current thread. */ |
24583e45 TBA |
847 | scoped_restore_current_thread restore_thread; |
848 | switch_to_thread (get_lwp_thread (lwp)); | |
47c0c975 | 849 | |
3e572f71 PA |
850 | #if USE_SIGTRAP_SIGINFO |
851 | if (ptrace (PTRACE_GETSIGINFO, lwpid_of (current_thread), | |
852 | (PTRACE_TYPE_ARG3) 0, &siginfo) == 0) | |
853 | { | |
854 | if (siginfo.si_signo == SIGTRAP) | |
855 | { | |
e7ad2f14 PA |
856 | if (GDB_ARCH_IS_TRAP_BRKPT (siginfo.si_code) |
857 | && GDB_ARCH_IS_TRAP_HWBKPT (siginfo.si_code)) | |
3e572f71 | 858 | { |
e7ad2f14 PA |
859 | /* The si_code is ambiguous on this arch -- check debug |
860 | registers. */ | |
861 | if (!check_stopped_by_watchpoint (lwp)) | |
862 | lwp->stop_reason = TARGET_STOPPED_BY_SW_BREAKPOINT; | |
863 | } | |
864 | else if (GDB_ARCH_IS_TRAP_BRKPT (siginfo.si_code)) | |
865 | { | |
866 | /* If we determine the LWP stopped for a SW breakpoint, | |
867 | trust it. Particularly don't check watchpoint | |
868 | registers, because at least on s390, we'd find | |
869 | stopped-by-watchpoint as long as there's a watchpoint | |
870 | set. */ | |
3e572f71 | 871 | lwp->stop_reason = TARGET_STOPPED_BY_SW_BREAKPOINT; |
3e572f71 | 872 | } |
e7ad2f14 | 873 | else if (GDB_ARCH_IS_TRAP_HWBKPT (siginfo.si_code)) |
3e572f71 | 874 | { |
e7ad2f14 PA |
875 | /* This can indicate either a hardware breakpoint or |
876 | hardware watchpoint. Check debug registers. */ | |
877 | if (!check_stopped_by_watchpoint (lwp)) | |
878 | lwp->stop_reason = TARGET_STOPPED_BY_HW_BREAKPOINT; | |
3e572f71 | 879 | } |
2bf6fb9d PA |
880 | else if (siginfo.si_code == TRAP_TRACE) |
881 | { | |
e7ad2f14 PA |
882 | /* We may have single stepped an instruction that |
883 | triggered a watchpoint. In that case, on some | |
884 | architectures (such as x86), instead of TRAP_HWBKPT, | |
885 | si_code indicates TRAP_TRACE, and we need to check | |
886 | the debug registers separately. */ | |
887 | if (!check_stopped_by_watchpoint (lwp)) | |
888 | lwp->stop_reason = TARGET_STOPPED_BY_SINGLE_STEP; | |
2bf6fb9d | 889 | } |
3e572f71 PA |
890 | } |
891 | } | |
892 | #else | |
582511be PA |
893 | /* We may have just stepped a breakpoint instruction. E.g., in |
894 | non-stop mode, GDB first tells the thread A to step a range, and | |
895 | then the user inserts a breakpoint inside the range. In that | |
8090aef2 PA |
896 | case we need to report the breakpoint PC. */ |
897 | if ((!lwp->stepping || lwp->stop_pc == sw_breakpoint_pc) | |
d7146cda | 898 | && low_breakpoint_at (sw_breakpoint_pc)) |
e7ad2f14 PA |
899 | lwp->stop_reason = TARGET_STOPPED_BY_SW_BREAKPOINT; |
900 | ||
901 | if (hardware_breakpoint_inserted_here (pc)) | |
902 | lwp->stop_reason = TARGET_STOPPED_BY_HW_BREAKPOINT; | |
903 | ||
904 | if (lwp->stop_reason == TARGET_STOPPED_BY_NO_REASON) | |
905 | check_stopped_by_watchpoint (lwp); | |
906 | #endif | |
907 | ||
908 | if (lwp->stop_reason == TARGET_STOPPED_BY_SW_BREAKPOINT) | |
582511be | 909 | { |
c058728c SM |
910 | threads_debug_printf |
911 | ("%s stopped by software breakpoint", | |
912 | target_pid_to_str (ptid_of (get_lwp_thread (lwp))).c_str ()); | |
582511be PA |
913 | |
914 | /* Back up the PC if necessary. */ | |
915 | if (pc != sw_breakpoint_pc) | |
e7ad2f14 | 916 | { |
582511be PA |
917 | struct regcache *regcache |
918 | = get_thread_regcache (current_thread, 1); | |
bf9ae9d8 | 919 | low_set_pc (regcache, sw_breakpoint_pc); |
582511be PA |
920 | } |
921 | ||
e7ad2f14 PA |
922 | /* Update this so we record the correct stop PC below. */ |
923 | pc = sw_breakpoint_pc; | |
582511be | 924 | } |
e7ad2f14 | 925 | else if (lwp->stop_reason == TARGET_STOPPED_BY_HW_BREAKPOINT) |
c058728c SM |
926 | threads_debug_printf |
927 | ("%s stopped by hardware breakpoint", | |
928 | target_pid_to_str (ptid_of (get_lwp_thread (lwp))).c_str ()); | |
e7ad2f14 | 929 | else if (lwp->stop_reason == TARGET_STOPPED_BY_WATCHPOINT) |
c058728c SM |
930 | threads_debug_printf |
931 | ("%s stopped by hardware watchpoint", | |
932 | target_pid_to_str (ptid_of (get_lwp_thread (lwp))).c_str ()); | |
e7ad2f14 | 933 | else if (lwp->stop_reason == TARGET_STOPPED_BY_SINGLE_STEP) |
c058728c SM |
934 | threads_debug_printf |
935 | ("%s stopped by trace", | |
936 | target_pid_to_str (ptid_of (get_lwp_thread (lwp))).c_str ()); | |
e7ad2f14 PA |
937 | |
938 | lwp->stop_pc = pc; | |
df95181f | 939 | return true; |
0d62e5e8 | 940 | } |
ce3a066d | 941 | |
fd000fb3 TBA |
942 | lwp_info * |
943 | linux_process_target::add_lwp (ptid_t ptid) | |
611cb4a5 | 944 | { |
c360a473 | 945 | lwp_info *lwp = new lwp_info; |
0d62e5e8 | 946 | |
754e3168 AH |
947 | lwp->thread = add_thread (ptid, lwp); |
948 | ||
fd000fb3 | 949 | low_new_thread (lwp); |
aa5ca48f | 950 | |
54a0b537 | 951 | return lwp; |
0d62e5e8 | 952 | } |
611cb4a5 | 953 | |
fd000fb3 TBA |
954 | void |
955 | linux_process_target::low_new_thread (lwp_info *info) | |
956 | { | |
957 | /* Nop. */ | |
958 | } | |
959 | ||
2090129c SDJ |
960 | /* Callback to be used when calling fork_inferior, responsible for |
961 | actually initiating the tracing of the inferior. */ | |
962 | ||
963 | static void | |
964 | linux_ptrace_fun () | |
965 | { | |
966 | if (ptrace (PTRACE_TRACEME, 0, (PTRACE_TYPE_ARG3) 0, | |
967 | (PTRACE_TYPE_ARG4) 0) < 0) | |
50fa3001 | 968 | trace_start_error_with_name ("ptrace"); |
2090129c SDJ |
969 | |
970 | if (setpgid (0, 0) < 0) | |
971 | trace_start_error_with_name ("setpgid"); | |
972 | ||
973 | /* If GDBserver is connected to gdb via stdio, redirect the inferior's | |
974 | stdout to stderr so that inferior i/o doesn't corrupt the connection. | |
975 | Also, redirect stdin to /dev/null. */ | |
976 | if (remote_connection_is_stdio ()) | |
977 | { | |
978 | if (close (0) < 0) | |
979 | trace_start_error_with_name ("close"); | |
980 | if (open ("/dev/null", O_RDONLY) < 0) | |
981 | trace_start_error_with_name ("open"); | |
982 | if (dup2 (2, 1) < 0) | |
983 | trace_start_error_with_name ("dup2"); | |
984 | if (write (2, "stdin/stdout redirected\n", | |
985 | sizeof ("stdin/stdout redirected\n") - 1) < 0) | |
986 | { | |
987 | /* Errors ignored. */; | |
988 | } | |
989 | } | |
990 | } | |
991 | ||
da6d8c04 | 992 | /* Start an inferior process and returns its pid. |
2090129c SDJ |
993 | PROGRAM is the name of the program to be started, and PROGRAM_ARGS |
994 | are its arguments. */ | |
da6d8c04 | 995 | |
15295543 TBA |
996 | int |
997 | linux_process_target::create_inferior (const char *program, | |
998 | const std::vector<char *> &program_args) | |
da6d8c04 | 999 | { |
c12a5089 | 1000 | client_state &cs = get_client_state (); |
a6dbe5df | 1001 | struct lwp_info *new_lwp; |
da6d8c04 | 1002 | int pid; |
95954743 | 1003 | ptid_t ptid; |
03583c20 | 1004 | |
41272101 TT |
1005 | { |
1006 | maybe_disable_address_space_randomization restore_personality | |
c12a5089 | 1007 | (cs.disable_randomization); |
bea571eb | 1008 | std::string str_program_args = construct_inferior_arguments (program_args); |
41272101 TT |
1009 | |
1010 | pid = fork_inferior (program, | |
1011 | str_program_args.c_str (), | |
1012 | get_environ ()->envp (), linux_ptrace_fun, | |
1013 | NULL, NULL, NULL, NULL); | |
1014 | } | |
03583c20 | 1015 | |
421490af PA |
1016 | /* When spawning a new process, we can't open the mem file yet. We |
1017 | still have to nurse the process through the shell, and that execs | |
1018 | a couple times. The address space a /proc/PID/mem file is | |
1019 | accessing is destroyed on exec. */ | |
1020 | process_info *proc = add_linux_process_no_mem_file (pid, 0); | |
95954743 | 1021 | |
184ea2f7 | 1022 | ptid = ptid_t (pid, pid); |
95954743 | 1023 | new_lwp = add_lwp (ptid); |
a6dbe5df | 1024 | new_lwp->must_set_ptrace_flags = 1; |
611cb4a5 | 1025 | |
2090129c SDJ |
1026 | post_fork_inferior (pid, program); |
1027 | ||
421490af PA |
1028 | /* PROC is now past the shell running the program we want, so we can |
1029 | open the /proc/PID/mem file. */ | |
1030 | open_proc_mem_file (proc); | |
1031 | ||
a9fa9f7d | 1032 | return pid; |
da6d8c04 DJ |
1033 | } |
1034 | ||
ece66d65 JS |
1035 | /* Implement the post_create_inferior target_ops method. */ |
1036 | ||
6dee9afb TBA |
1037 | void |
1038 | linux_process_target::post_create_inferior () | |
ece66d65 JS |
1039 | { |
1040 | struct lwp_info *lwp = get_thread_lwp (current_thread); | |
1041 | ||
797bcff5 | 1042 | low_arch_setup (); |
ece66d65 JS |
1043 | |
1044 | if (lwp->must_set_ptrace_flags) | |
1045 | { | |
1046 | struct process_info *proc = current_process (); | |
1047 | int options = linux_low_ptrace_options (proc->attached); | |
1048 | ||
1049 | linux_enable_event_reporting (lwpid_of (current_thread), options); | |
1050 | lwp->must_set_ptrace_flags = 0; | |
1051 | } | |
1052 | } | |
1053 | ||
7ae1a6a6 | 1054 | int |
fd000fb3 | 1055 | linux_process_target::attach_lwp (ptid_t ptid) |
da6d8c04 | 1056 | { |
54a0b537 | 1057 | struct lwp_info *new_lwp; |
e38504b3 | 1058 | int lwpid = ptid.lwp (); |
611cb4a5 | 1059 | |
b8e1b30e | 1060 | if (ptrace (PTRACE_ATTACH, lwpid, (PTRACE_TYPE_ARG3) 0, (PTRACE_TYPE_ARG4) 0) |
56f7af9c | 1061 | != 0) |
7ae1a6a6 | 1062 | return errno; |
24a09b5f | 1063 | |
b3312d80 | 1064 | new_lwp = add_lwp (ptid); |
0d62e5e8 | 1065 | |
a6dbe5df PA |
1066 | /* We need to wait for SIGSTOP before being able to make the next |
1067 | ptrace call on this LWP. */ | |
1068 | new_lwp->must_set_ptrace_flags = 1; | |
1069 | ||
644cebc9 | 1070 | if (linux_proc_pid_is_stopped (lwpid)) |
c14d7ab2 | 1071 | { |
c058728c | 1072 | threads_debug_printf ("Attached to a stopped process"); |
c14d7ab2 PA |
1073 | |
1074 | /* The process is definitely stopped. It is in a job control | |
1075 | stop, unless the kernel predates the TASK_STOPPED / | |
1076 | TASK_TRACED distinction, in which case it might be in a | |
1077 | ptrace stop. Make sure it is in a ptrace stop; from there we | |
1078 | can kill it, signal it, et cetera. | |
1079 | ||
1080 | First make sure there is a pending SIGSTOP. Since we are | |
1081 | already attached, the process can not transition from stopped | |
1082 | to running without a PTRACE_CONT; so we know this signal will | |
1083 | go into the queue. The SIGSTOP generated by PTRACE_ATTACH is | |
1084 | probably already in the queue (unless this kernel is old | |
1085 | enough to use TASK_STOPPED for ptrace stops); but since | |
1086 | SIGSTOP is not an RT signal, it can only be queued once. */ | |
1087 | kill_lwp (lwpid, SIGSTOP); | |
1088 | ||
1089 | /* Finally, resume the stopped process. This will deliver the | |
1090 | SIGSTOP (or a higher priority signal, just like normal | |
1091 | PTRACE_ATTACH), which we'll catch later on. */ | |
b8e1b30e | 1092 | ptrace (PTRACE_CONT, lwpid, (PTRACE_TYPE_ARG3) 0, (PTRACE_TYPE_ARG4) 0); |
c14d7ab2 PA |
1093 | } |
1094 | ||
0d62e5e8 | 1095 | /* The next time we wait for this LWP we'll see a SIGSTOP as PTRACE_ATTACH |
0e21c1ec DE |
1096 | brings it to a halt. |
1097 | ||
1098 | There are several cases to consider here: | |
1099 | ||
1100 | 1) gdbserver has already attached to the process and is being notified | |
1b3f6016 | 1101 | of a new thread that is being created. |
d50171e4 PA |
1102 | In this case we should ignore that SIGSTOP and resume the |
1103 | process. This is handled below by setting stop_expected = 1, | |
8336d594 | 1104 | and the fact that add_thread sets last_resume_kind == |
d50171e4 | 1105 | resume_continue. |
0e21c1ec DE |
1106 | |
1107 | 2) This is the first thread (the process thread), and we're attaching | |
1b3f6016 PA |
1108 | to it via attach_inferior. |
1109 | In this case we want the process thread to stop. | |
d50171e4 PA |
1110 | This is handled by having linux_attach set last_resume_kind == |
1111 | resume_stop after we return. | |
e3deef73 LM |
1112 | |
1113 | If the pid we are attaching to is also the tgid, we attach to and | |
1114 | stop all the existing threads. Otherwise, we attach to pid and | |
1115 | ignore any other threads in the same group as this pid. | |
0e21c1ec DE |
1116 | |
1117 | 3) GDB is connecting to gdbserver and is requesting an enumeration of all | |
1b3f6016 PA |
1118 | existing threads. |
1119 | In this case we want the thread to stop. | |
1120 | FIXME: This case is currently not properly handled. | |
1121 | We should wait for the SIGSTOP but don't. Things work apparently | |
1122 | because enough time passes between when we ptrace (ATTACH) and when | |
1123 | gdb makes the next ptrace call on the thread. | |
0d62e5e8 DJ |
1124 | |
1125 | On the other hand, if we are currently trying to stop all threads, we | |
1126 | should treat the new thread as if we had sent it a SIGSTOP. This works | |
54a0b537 | 1127 | because we are guaranteed that the add_lwp call above added us to the |
0e21c1ec DE |
1128 | end of the list, and so the new thread has not yet reached |
1129 | wait_for_sigstop (but will). */ | |
d50171e4 | 1130 | new_lwp->stop_expected = 1; |
0d62e5e8 | 1131 | |
7ae1a6a6 | 1132 | return 0; |
95954743 PA |
1133 | } |
1134 | ||
8784d563 PA |
1135 | /* Callback for linux_proc_attach_tgid_threads. Attach to PTID if not |
1136 | already attached. Returns true if a new LWP is found, false | |
1137 | otherwise. */ | |
1138 | ||
1139 | static int | |
1140 | attach_proc_task_lwp_callback (ptid_t ptid) | |
1141 | { | |
1142 | /* Is this a new thread? */ | |
1143 | if (find_thread_ptid (ptid) == NULL) | |
1144 | { | |
e38504b3 | 1145 | int lwpid = ptid.lwp (); |
8784d563 PA |
1146 | int err; |
1147 | ||
c058728c | 1148 | threads_debug_printf ("Found new lwp %d", lwpid); |
8784d563 | 1149 | |
fd000fb3 | 1150 | err = the_linux_target->attach_lwp (ptid); |
8784d563 PA |
1151 | |
1152 | /* Be quiet if we simply raced with the thread exiting. EPERM | |
1153 | is returned if the thread's task still exists, and is marked | |
1154 | as exited or zombie, as well as other conditions, so in that | |
1155 | case, confirm the status in /proc/PID/status. */ | |
1156 | if (err == ESRCH | |
1157 | || (err == EPERM && linux_proc_pid_is_gone (lwpid))) | |
c058728c SM |
1158 | threads_debug_printf |
1159 | ("Cannot attach to lwp %d: thread is gone (%d: %s)", | |
1160 | lwpid, err, safe_strerror (err)); | |
8784d563 PA |
1161 | else if (err != 0) |
1162 | { | |
4d9b86e1 | 1163 | std::string reason |
50fa3001 | 1164 | = linux_ptrace_attach_fail_reason_string (ptid, err); |
4d9b86e1 | 1165 | |
c6f7f9c8 | 1166 | error (_("Cannot attach to lwp %d: %s"), lwpid, reason.c_str ()); |
8784d563 PA |
1167 | } |
1168 | ||
1169 | return 1; | |
1170 | } | |
1171 | return 0; | |
1172 | } | |
1173 | ||
500c1d85 PA |
1174 | static void async_file_mark (void); |
1175 | ||
e3deef73 LM |
1176 | /* Attach to PID. If PID is the tgid, attach to it and all |
1177 | of its threads. */ | |
1178 | ||
ef03dad8 TBA |
1179 | int |
1180 | linux_process_target::attach (unsigned long pid) | |
0d62e5e8 | 1181 | { |
500c1d85 PA |
1182 | struct process_info *proc; |
1183 | struct thread_info *initial_thread; | |
184ea2f7 | 1184 | ptid_t ptid = ptid_t (pid, pid); |
7ae1a6a6 PA |
1185 | int err; |
1186 | ||
421490af PA |
1187 | /* Delay opening the /proc/PID/mem file until we've successfully |
1188 | attached. */ | |
1189 | proc = add_linux_process_no_mem_file (pid, 1); | |
df0da8a2 | 1190 | |
e3deef73 LM |
1191 | /* Attach to PID. We will check for other threads |
1192 | soon. */ | |
fd000fb3 | 1193 | err = attach_lwp (ptid); |
7ae1a6a6 | 1194 | if (err != 0) |
4d9b86e1 | 1195 | { |
f551c8ef | 1196 | this->remove_linux_process (proc); |
4d9b86e1 | 1197 | |
50fa3001 SDJ |
1198 | std::string reason = linux_ptrace_attach_fail_reason_string (ptid, err); |
1199 | error ("Cannot attach to process %ld: %s", pid, reason.c_str ()); | |
4d9b86e1 | 1200 | } |
7ae1a6a6 | 1201 | |
421490af PA |
1202 | open_proc_mem_file (proc); |
1203 | ||
500c1d85 PA |
1204 | /* Don't ignore the initial SIGSTOP if we just attached to this |
1205 | process. It will be collected by wait shortly. */ | |
184ea2f7 | 1206 | initial_thread = find_thread_ptid (ptid_t (pid, pid)); |
59487af3 | 1207 | gdb_assert (initial_thread != nullptr); |
500c1d85 | 1208 | initial_thread->last_resume_kind = resume_stop; |
0d62e5e8 | 1209 | |
8784d563 PA |
1210 | /* We must attach to every LWP. If /proc is mounted, use that to |
1211 | find them now. On the one hand, the inferior may be using raw | |
1212 | clone instead of using pthreads. On the other hand, even if it | |
1213 | is using pthreads, GDB may not be connected yet (thread_db needs | |
1214 | to do symbol lookups, through qSymbol). Also, thread_db walks | |
1215 | structures in the inferior's address space to find the list of | |
1216 | threads/LWPs, and those structures may well be corrupted. Note | |
1217 | that once thread_db is loaded, we'll still use it to list threads | |
1218 | and associate pthread info with each LWP. */ | |
c6f7f9c8 TT |
1219 | try |
1220 | { | |
1221 | linux_proc_attach_tgid_threads (pid, attach_proc_task_lwp_callback); | |
1222 | } | |
1223 | catch (const gdb_exception_error &) | |
1224 | { | |
1225 | /* Make sure we do not deliver the SIGSTOP to the process. */ | |
1226 | initial_thread->last_resume_kind = resume_continue; | |
1227 | ||
1228 | this->detach (proc); | |
1229 | throw; | |
1230 | } | |
500c1d85 PA |
1231 | |
1232 | /* GDB will shortly read the xml target description for this | |
1233 | process, to figure out the process' architecture. But the target | |
1234 | description is only filled in when the first process/thread in | |
1235 | the thread group reports its initial PTRACE_ATTACH SIGSTOP. Do | |
1236 | that now, otherwise, if GDB is fast enough, it could read the | |
1237 | target description _before_ that initial stop. */ | |
1238 | if (non_stop) | |
1239 | { | |
1240 | struct lwp_info *lwp; | |
1241 | int wstat, lwpid; | |
f2907e49 | 1242 | ptid_t pid_ptid = ptid_t (pid); |
500c1d85 | 1243 | |
d16f3f6c | 1244 | lwpid = wait_for_event_filtered (pid_ptid, pid_ptid, &wstat, __WALL); |
500c1d85 PA |
1245 | gdb_assert (lwpid > 0); |
1246 | ||
f2907e49 | 1247 | lwp = find_lwp_pid (ptid_t (lwpid)); |
59487af3 | 1248 | gdb_assert (lwp != nullptr); |
500c1d85 PA |
1249 | |
1250 | if (!WIFSTOPPED (wstat) || WSTOPSIG (wstat) != SIGSTOP) | |
1251 | { | |
1252 | lwp->status_pending_p = 1; | |
1253 | lwp->status_pending = wstat; | |
1254 | } | |
1255 | ||
1256 | initial_thread->last_resume_kind = resume_continue; | |
1257 | ||
1258 | async_file_mark (); | |
1259 | ||
1260 | gdb_assert (proc->tdesc != NULL); | |
1261 | } | |
1262 | ||
95954743 PA |
1263 | return 0; |
1264 | } | |
1265 | ||
95954743 | 1266 | static int |
e4eb0dec | 1267 | last_thread_of_process_p (int pid) |
95954743 | 1268 | { |
e4eb0dec | 1269 | bool seen_one = false; |
95954743 | 1270 | |
da4ae14a | 1271 | thread_info *thread = find_thread (pid, [&] (thread_info *thr_arg) |
95954743 | 1272 | { |
e4eb0dec SM |
1273 | if (!seen_one) |
1274 | { | |
1275 | /* This is the first thread of this process we see. */ | |
1276 | seen_one = true; | |
1277 | return false; | |
1278 | } | |
1279 | else | |
1280 | { | |
1281 | /* This is the second thread of this process we see. */ | |
1282 | return true; | |
1283 | } | |
1284 | }); | |
da6d8c04 | 1285 | |
e4eb0dec | 1286 | return thread == NULL; |
95954743 PA |
1287 | } |
1288 | ||
da84f473 PA |
1289 | /* Kill LWP. */ |
1290 | ||
1291 | static void | |
1292 | linux_kill_one_lwp (struct lwp_info *lwp) | |
1293 | { | |
d86d4aaf DE |
1294 | struct thread_info *thr = get_lwp_thread (lwp); |
1295 | int pid = lwpid_of (thr); | |
da84f473 PA |
1296 | |
1297 | /* PTRACE_KILL is unreliable. After stepping into a signal handler, | |
1298 | there is no signal context, and ptrace(PTRACE_KILL) (or | |
1299 | ptrace(PTRACE_CONT, SIGKILL), pretty much the same) acts like | |
1300 | ptrace(CONT, pid, 0,0) and just resumes the tracee. A better | |
1301 | alternative is to kill with SIGKILL. We only need one SIGKILL | |
1302 | per process, not one for each thread. But since we still support | |
4a6ed09b PA |
1303 | support debugging programs using raw clone without CLONE_THREAD, |
1304 | we send one for each thread. For years, we used PTRACE_KILL | |
1305 | only, so we're being a bit paranoid about some old kernels where | |
1306 | PTRACE_KILL might work better (dubious if there are any such, but | |
1307 | that's why it's paranoia), so we try SIGKILL first, PTRACE_KILL | |
1308 | second, and so we're fine everywhere. */ | |
da84f473 PA |
1309 | |
1310 | errno = 0; | |
69ff6be5 | 1311 | kill_lwp (pid, SIGKILL); |
da84f473 | 1312 | if (debug_threads) |
ce9e3fe7 PA |
1313 | { |
1314 | int save_errno = errno; | |
1315 | ||
c058728c SM |
1316 | threads_debug_printf ("kill_lwp (SIGKILL) %s, 0, 0 (%s)", |
1317 | target_pid_to_str (ptid_of (thr)).c_str (), | |
1318 | save_errno ? safe_strerror (save_errno) : "OK"); | |
ce9e3fe7 | 1319 | } |
da84f473 PA |
1320 | |
1321 | errno = 0; | |
b8e1b30e | 1322 | ptrace (PTRACE_KILL, pid, (PTRACE_TYPE_ARG3) 0, (PTRACE_TYPE_ARG4) 0); |
da84f473 | 1323 | if (debug_threads) |
ce9e3fe7 PA |
1324 | { |
1325 | int save_errno = errno; | |
1326 | ||
c058728c SM |
1327 | threads_debug_printf ("PTRACE_KILL %s, 0, 0 (%s)", |
1328 | target_pid_to_str (ptid_of (thr)).c_str (), | |
1329 | save_errno ? safe_strerror (save_errno) : "OK"); | |
ce9e3fe7 | 1330 | } |
da84f473 PA |
1331 | } |
1332 | ||
e76126e8 PA |
1333 | /* Kill LWP and wait for it to die. */ |
1334 | ||
1335 | static void | |
1336 | kill_wait_lwp (struct lwp_info *lwp) | |
1337 | { | |
1338 | struct thread_info *thr = get_lwp_thread (lwp); | |
e99b03dc | 1339 | int pid = ptid_of (thr).pid (); |
e38504b3 | 1340 | int lwpid = ptid_of (thr).lwp (); |
e76126e8 PA |
1341 | int wstat; |
1342 | int res; | |
1343 | ||
c058728c | 1344 | threads_debug_printf ("killing lwp %d, for pid: %d", lwpid, pid); |
e76126e8 PA |
1345 | |
1346 | do | |
1347 | { | |
1348 | linux_kill_one_lwp (lwp); | |
1349 | ||
1350 | /* Make sure it died. Notes: | |
1351 | ||
1352 | - The loop is most likely unnecessary. | |
1353 | ||
d16f3f6c | 1354 | - We don't use wait_for_event as that could delete lwps |
e76126e8 PA |
1355 | while we're iterating over them. We're not interested in |
1356 | any pending status at this point, only in making sure all | |
1357 | wait status on the kernel side are collected until the | |
1358 | process is reaped. | |
1359 | ||
1360 | - We don't use __WALL here as the __WALL emulation relies on | |
1361 | SIGCHLD, and killing a stopped process doesn't generate | |
1362 | one, nor an exit status. | |
1363 | */ | |
1364 | res = my_waitpid (lwpid, &wstat, 0); | |
1365 | if (res == -1 && errno == ECHILD) | |
1366 | res = my_waitpid (lwpid, &wstat, __WCLONE); | |
1367 | } while (res > 0 && WIFSTOPPED (wstat)); | |
1368 | ||
586b02a9 PA |
1369 | /* Even if it was stopped, the child may have already disappeared. |
1370 | E.g., if it was killed by SIGKILL. */ | |
1371 | if (res < 0 && errno != ECHILD) | |
1372 | perror_with_name ("kill_wait_lwp"); | |
e76126e8 PA |
1373 | } |
1374 | ||
578290ec | 1375 | /* Callback for `for_each_thread'. Kills an lwp of a given process, |
da84f473 | 1376 | except the leader. */ |
95954743 | 1377 | |
578290ec SM |
1378 | static void |
1379 | kill_one_lwp_callback (thread_info *thread, int pid) | |
da6d8c04 | 1380 | { |
54a0b537 | 1381 | struct lwp_info *lwp = get_thread_lwp (thread); |
0d62e5e8 | 1382 | |
fd500816 DJ |
1383 | /* We avoid killing the first thread here, because of a Linux kernel (at |
1384 | least 2.6.0-test7 through 2.6.8-rc4) bug; if we kill the parent before | |
1385 | the children get a chance to be reaped, it will remain a zombie | |
1386 | forever. */ | |
95954743 | 1387 | |
d86d4aaf | 1388 | if (lwpid_of (thread) == pid) |
95954743 | 1389 | { |
c058728c SM |
1390 | threads_debug_printf ("is last of process %s", |
1391 | target_pid_to_str (thread->id).c_str ()); | |
578290ec | 1392 | return; |
95954743 | 1393 | } |
fd500816 | 1394 | |
e76126e8 | 1395 | kill_wait_lwp (lwp); |
da6d8c04 DJ |
1396 | } |
1397 | ||
c6885a57 TBA |
1398 | int |
1399 | linux_process_target::kill (process_info *process) | |
0d62e5e8 | 1400 | { |
a780ef4f | 1401 | int pid = process->pid; |
9d606399 | 1402 | |
f9e39928 PA |
1403 | /* If we're killing a running inferior, make sure it is stopped |
1404 | first, as PTRACE_KILL will not work otherwise. */ | |
7984d532 | 1405 | stop_all_lwps (0, NULL); |
f9e39928 | 1406 | |
578290ec SM |
1407 | for_each_thread (pid, [&] (thread_info *thread) |
1408 | { | |
1409 | kill_one_lwp_callback (thread, pid); | |
1410 | }); | |
fd500816 | 1411 | |
54a0b537 | 1412 | /* See the comment in linux_kill_one_lwp. We did not kill the first |
fd500816 | 1413 | thread in the list, so do so now. */ |
a780ef4f | 1414 | lwp_info *lwp = find_lwp_pid (ptid_t (pid)); |
bd99dc85 | 1415 | |
784867a5 | 1416 | if (lwp == NULL) |
c058728c | 1417 | threads_debug_printf ("cannot find lwp for pid: %d", pid); |
784867a5 | 1418 | else |
e76126e8 | 1419 | kill_wait_lwp (lwp); |
2d717e4f | 1420 | |
8adb37b9 | 1421 | mourn (process); |
f9e39928 PA |
1422 | |
1423 | /* Since we presently can only stop all lwps of all processes, we | |
1424 | need to unstop lwps of other processes. */ | |
7984d532 | 1425 | unstop_all_lwps (0, NULL); |
95954743 | 1426 | return 0; |
0d62e5e8 DJ |
1427 | } |
1428 | ||
9b224c5e PA |
1429 | /* Get pending signal of THREAD, for detaching purposes. This is the |
1430 | signal the thread last stopped for, which we need to deliver to the | |
1431 | thread when detaching, otherwise, it'd be suppressed/lost. */ | |
1432 | ||
1433 | static int | |
1434 | get_detach_signal (struct thread_info *thread) | |
1435 | { | |
c12a5089 | 1436 | client_state &cs = get_client_state (); |
a493e3e2 | 1437 | enum gdb_signal signo = GDB_SIGNAL_0; |
9b224c5e PA |
1438 | int status; |
1439 | struct lwp_info *lp = get_thread_lwp (thread); | |
1440 | ||
1441 | if (lp->status_pending_p) | |
1442 | status = lp->status_pending; | |
1443 | else | |
1444 | { | |
1445 | /* If the thread had been suspended by gdbserver, and it stopped | |
1446 | cleanly, then it'll have stopped with SIGSTOP. But we don't | |
1447 | want to deliver that SIGSTOP. */ | |
183be222 SM |
1448 | if (thread->last_status.kind () != TARGET_WAITKIND_STOPPED |
1449 | || thread->last_status.sig () == GDB_SIGNAL_0) | |
9b224c5e PA |
1450 | return 0; |
1451 | ||
1452 | /* Otherwise, we may need to deliver the signal we | |
1453 | intercepted. */ | |
1454 | status = lp->last_status; | |
1455 | } | |
1456 | ||
1457 | if (!WIFSTOPPED (status)) | |
1458 | { | |
c058728c SM |
1459 | threads_debug_printf ("lwp %s hasn't stopped: no pending signal", |
1460 | target_pid_to_str (ptid_of (thread)).c_str ()); | |
9b224c5e PA |
1461 | return 0; |
1462 | } | |
1463 | ||
1464 | /* Extended wait statuses aren't real SIGTRAPs. */ | |
89a5711c | 1465 | if (WSTOPSIG (status) == SIGTRAP && linux_is_extended_waitstatus (status)) |
9b224c5e | 1466 | { |
c058728c SM |
1467 | threads_debug_printf ("lwp %s had stopped with extended " |
1468 | "status: no pending signal", | |
1469 | target_pid_to_str (ptid_of (thread)).c_str ()); | |
9b224c5e PA |
1470 | return 0; |
1471 | } | |
1472 | ||
2ea28649 | 1473 | signo = gdb_signal_from_host (WSTOPSIG (status)); |
9b224c5e | 1474 | |
c12a5089 | 1475 | if (cs.program_signals_p && !cs.program_signals[signo]) |
9b224c5e | 1476 | { |
c058728c SM |
1477 | threads_debug_printf ("lwp %s had signal %s, but it is in nopass state", |
1478 | target_pid_to_str (ptid_of (thread)).c_str (), | |
1479 | gdb_signal_to_string (signo)); | |
9b224c5e PA |
1480 | return 0; |
1481 | } | |
c12a5089 | 1482 | else if (!cs.program_signals_p |
9b224c5e PA |
1483 | /* If we have no way to know which signals GDB does not |
1484 | want to have passed to the program, assume | |
1485 | SIGTRAP/SIGINT, which is GDB's default. */ | |
a493e3e2 | 1486 | && (signo == GDB_SIGNAL_TRAP || signo == GDB_SIGNAL_INT)) |
9b224c5e | 1487 | { |
c058728c SM |
1488 | threads_debug_printf ("lwp %s had signal %s, " |
1489 | "but we don't know if we should pass it. " | |
1490 | "Default to not.", | |
1491 | target_pid_to_str (ptid_of (thread)).c_str (), | |
1492 | gdb_signal_to_string (signo)); | |
9b224c5e PA |
1493 | return 0; |
1494 | } | |
1495 | else | |
1496 | { | |
c058728c SM |
1497 | threads_debug_printf ("lwp %s has pending signal %s: delivering it", |
1498 | target_pid_to_str (ptid_of (thread)).c_str (), | |
1499 | gdb_signal_to_string (signo)); | |
9b224c5e PA |
1500 | |
1501 | return WSTOPSIG (status); | |
1502 | } | |
1503 | } | |
1504 | ||
fd000fb3 TBA |
1505 | void |
1506 | linux_process_target::detach_one_lwp (lwp_info *lwp) | |
6ad8ae5c | 1507 | { |
ced2dffb | 1508 | struct thread_info *thread = get_lwp_thread (lwp); |
9b224c5e | 1509 | int sig; |
ced2dffb | 1510 | int lwpid; |
6ad8ae5c | 1511 | |
9b224c5e | 1512 | /* If there is a pending SIGSTOP, get rid of it. */ |
54a0b537 | 1513 | if (lwp->stop_expected) |
ae13219e | 1514 | { |
c058728c SM |
1515 | threads_debug_printf ("Sending SIGCONT to %s", |
1516 | target_pid_to_str (ptid_of (thread)).c_str ()); | |
9b224c5e | 1517 | |
d86d4aaf | 1518 | kill_lwp (lwpid_of (thread), SIGCONT); |
54a0b537 | 1519 | lwp->stop_expected = 0; |
ae13219e DJ |
1520 | } |
1521 | ||
9b224c5e PA |
1522 | /* Pass on any pending signal for this thread. */ |
1523 | sig = get_detach_signal (thread); | |
1524 | ||
ced2dffb PA |
1525 | /* Preparing to resume may try to write registers, and fail if the |
1526 | lwp is zombie. If that happens, ignore the error. We'll handle | |
1527 | it below, when detach fails with ESRCH. */ | |
a70b8144 | 1528 | try |
ced2dffb PA |
1529 | { |
1530 | /* Flush any pending changes to the process's registers. */ | |
1531 | regcache_invalidate_thread (thread); | |
1532 | ||
1533 | /* Finally, let it resume. */ | |
d7599cc0 | 1534 | low_prepare_to_resume (lwp); |
ced2dffb | 1535 | } |
230d2906 | 1536 | catch (const gdb_exception_error &ex) |
ced2dffb PA |
1537 | { |
1538 | if (!check_ptrace_stopped_lwp_gone (lwp)) | |
eedc3f4f | 1539 | throw; |
ced2dffb | 1540 | } |
ced2dffb PA |
1541 | |
1542 | lwpid = lwpid_of (thread); | |
1543 | if (ptrace (PTRACE_DETACH, lwpid, (PTRACE_TYPE_ARG3) 0, | |
b8e1b30e | 1544 | (PTRACE_TYPE_ARG4) (long) sig) < 0) |
ced2dffb PA |
1545 | { |
1546 | int save_errno = errno; | |
1547 | ||
1548 | /* We know the thread exists, so ESRCH must mean the lwp is | |
1549 | zombie. This can happen if one of the already-detached | |
1550 | threads exits the whole thread group. In that case we're | |
1551 | still attached, and must reap the lwp. */ | |
1552 | if (save_errno == ESRCH) | |
1553 | { | |
1554 | int ret, status; | |
1555 | ||
1556 | ret = my_waitpid (lwpid, &status, __WALL); | |
1557 | if (ret == -1) | |
1558 | { | |
1559 | warning (_("Couldn't reap LWP %d while detaching: %s"), | |
6d91ce9a | 1560 | lwpid, safe_strerror (errno)); |
ced2dffb PA |
1561 | } |
1562 | else if (!WIFEXITED (status) && !WIFSIGNALED (status)) | |
1563 | { | |
1564 | warning (_("Reaping LWP %d while detaching " | |
1565 | "returned unexpected status 0x%x"), | |
1566 | lwpid, status); | |
1567 | } | |
1568 | } | |
1569 | else | |
1570 | { | |
1571 | error (_("Can't detach %s: %s"), | |
61d7f128 | 1572 | target_pid_to_str (ptid_of (thread)).c_str (), |
6d91ce9a | 1573 | safe_strerror (save_errno)); |
ced2dffb PA |
1574 | } |
1575 | } | |
c058728c SM |
1576 | else |
1577 | threads_debug_printf ("PTRACE_DETACH (%s, %s, 0) (OK)", | |
1578 | target_pid_to_str (ptid_of (thread)).c_str (), | |
1579 | strsignal (sig)); | |
bd99dc85 PA |
1580 | |
1581 | delete_lwp (lwp); | |
ced2dffb PA |
1582 | } |
1583 | ||
9061c9cf TBA |
1584 | int |
1585 | linux_process_target::detach (process_info *process) | |
95954743 | 1586 | { |
ced2dffb | 1587 | struct lwp_info *main_lwp; |
95954743 | 1588 | |
863d01bd PA |
1589 | /* As there's a step over already in progress, let it finish first, |
1590 | otherwise nesting a stabilize_threads operation on top gets real | |
1591 | messy. */ | |
1592 | complete_ongoing_step_over (); | |
1593 | ||
f9e39928 | 1594 | /* Stop all threads before detaching. First, ptrace requires that |
30baf67b | 1595 | the thread is stopped to successfully detach. Second, thread_db |
f9e39928 PA |
1596 | may need to uninstall thread event breakpoints from memory, which |
1597 | only works with a stopped process anyway. */ | |
7984d532 | 1598 | stop_all_lwps (0, NULL); |
f9e39928 | 1599 | |
ca5c370d | 1600 | #ifdef USE_THREAD_DB |
8336d594 | 1601 | thread_db_detach (process); |
ca5c370d PA |
1602 | #endif |
1603 | ||
fa593d66 | 1604 | /* Stabilize threads (move out of jump pads). */ |
5c9eb2f2 | 1605 | target_stabilize_threads (); |
fa593d66 | 1606 | |
ced2dffb PA |
1607 | /* Detach from the clone lwps first. If the thread group exits just |
1608 | while we're detaching, we must reap the clone lwps before we're | |
1609 | able to reap the leader. */ | |
fd000fb3 TBA |
1610 | for_each_thread (process->pid, [this] (thread_info *thread) |
1611 | { | |
1612 | /* We don't actually detach from the thread group leader just yet. | |
1613 | If the thread group exits, we must reap the zombie clone lwps | |
1614 | before we're able to reap the leader. */ | |
1615 | if (thread->id.pid () == thread->id.lwp ()) | |
1616 | return; | |
1617 | ||
1618 | lwp_info *lwp = get_thread_lwp (thread); | |
1619 | detach_one_lwp (lwp); | |
1620 | }); | |
ced2dffb | 1621 | |
ef2ddb33 | 1622 | main_lwp = find_lwp_pid (ptid_t (process->pid)); |
59487af3 | 1623 | gdb_assert (main_lwp != nullptr); |
fd000fb3 | 1624 | detach_one_lwp (main_lwp); |
8336d594 | 1625 | |
8adb37b9 | 1626 | mourn (process); |
f9e39928 PA |
1627 | |
1628 | /* Since we presently can only stop all lwps of all processes, we | |
1629 | need to unstop lwps of other processes. */ | |
7984d532 | 1630 | unstop_all_lwps (0, NULL); |
f9e39928 PA |
1631 | return 0; |
1632 | } | |
1633 | ||
1634 | /* Remove all LWPs that belong to process PROC from the lwp list. */ | |
1635 | ||
8adb37b9 TBA |
1636 | void |
1637 | linux_process_target::mourn (process_info *process) | |
8336d594 | 1638 | { |
8336d594 PA |
1639 | #ifdef USE_THREAD_DB |
1640 | thread_db_mourn (process); | |
1641 | #endif | |
1642 | ||
fd000fb3 | 1643 | for_each_thread (process->pid, [this] (thread_info *thread) |
6b2a85da SM |
1644 | { |
1645 | delete_lwp (get_thread_lwp (thread)); | |
1646 | }); | |
f9e39928 | 1647 | |
f551c8ef | 1648 | this->remove_linux_process (process); |
8336d594 PA |
1649 | } |
1650 | ||
95a49a39 TBA |
1651 | void |
1652 | linux_process_target::join (int pid) | |
444d6139 | 1653 | { |
444d6139 PA |
1654 | int status, ret; |
1655 | ||
1656 | do { | |
d105de22 | 1657 | ret = my_waitpid (pid, &status, 0); |
444d6139 PA |
1658 | if (WIFEXITED (status) || WIFSIGNALED (status)) |
1659 | break; | |
1660 | } while (ret != -1 || errno != ECHILD); | |
1661 | } | |
1662 | ||
13d3d99b TBA |
1663 | /* Return true if the given thread is still alive. */ |
1664 | ||
1665 | bool | |
1666 | linux_process_target::thread_alive (ptid_t ptid) | |
0d62e5e8 | 1667 | { |
95954743 PA |
1668 | struct lwp_info *lwp = find_lwp_pid (ptid); |
1669 | ||
1670 | /* We assume we always know if a thread exits. If a whole process | |
1671 | exited but we still haven't been able to report it to GDB, we'll | |
1672 | hold on to the last lwp of the dead process. */ | |
1673 | if (lwp != NULL) | |
00db26fa | 1674 | return !lwp_is_marked_dead (lwp); |
0d62e5e8 DJ |
1675 | else |
1676 | return 0; | |
1677 | } | |
1678 | ||
df95181f TBA |
1679 | bool |
1680 | linux_process_target::thread_still_has_status_pending (thread_info *thread) | |
582511be PA |
1681 | { |
1682 | struct lwp_info *lp = get_thread_lwp (thread); | |
1683 | ||
1684 | if (!lp->status_pending_p) | |
1685 | return 0; | |
1686 | ||
582511be | 1687 | if (thread->last_resume_kind != resume_stop |
15c66dd6 PA |
1688 | && (lp->stop_reason == TARGET_STOPPED_BY_SW_BREAKPOINT |
1689 | || lp->stop_reason == TARGET_STOPPED_BY_HW_BREAKPOINT)) | |
582511be | 1690 | { |
582511be PA |
1691 | CORE_ADDR pc; |
1692 | int discard = 0; | |
1693 | ||
1694 | gdb_assert (lp->last_status != 0); | |
1695 | ||
1696 | pc = get_pc (lp); | |
1697 | ||
24583e45 TBA |
1698 | scoped_restore_current_thread restore_thread; |
1699 | switch_to_thread (thread); | |
582511be PA |
1700 | |
1701 | if (pc != lp->stop_pc) | |
1702 | { | |
c058728c SM |
1703 | threads_debug_printf ("PC of %ld changed", |
1704 | lwpid_of (thread)); | |
582511be PA |
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 | 1711 | { |
c058728c SM |
1712 | threads_debug_printf ("previous SW breakpoint of %ld gone", |
1713 | lwpid_of (thread)); | |
582511be PA |
1714 | discard = 1; |
1715 | } | |
15c66dd6 | 1716 | else if (lp->stop_reason == TARGET_STOPPED_BY_HW_BREAKPOINT |
582511be PA |
1717 | && !hardware_breakpoint_inserted_here (pc)) |
1718 | { | |
c058728c SM |
1719 | threads_debug_printf ("previous HW breakpoint of %ld gone", |
1720 | lwpid_of (thread)); | |
582511be PA |
1721 | discard = 1; |
1722 | } | |
3e572f71 | 1723 | #endif |
582511be | 1724 | |
582511be PA |
1725 | if (discard) |
1726 | { | |
c058728c | 1727 | threads_debug_printf ("discarding pending breakpoint status"); |
582511be PA |
1728 | lp->status_pending_p = 0; |
1729 | return 0; | |
1730 | } | |
1731 | } | |
1732 | ||
1733 | return 1; | |
1734 | } | |
1735 | ||
a681f9c9 PA |
1736 | /* Returns true if LWP is resumed from the client's perspective. */ |
1737 | ||
1738 | static int | |
1739 | lwp_resumed (struct lwp_info *lwp) | |
1740 | { | |
1741 | struct thread_info *thread = get_lwp_thread (lwp); | |
1742 | ||
1743 | if (thread->last_resume_kind != resume_stop) | |
1744 | return 1; | |
1745 | ||
1746 | /* Did gdb send us a `vCont;t', but we haven't reported the | |
1747 | corresponding stop to gdb yet? If so, the thread is still | |
1748 | resumed/running from gdb's perspective. */ | |
1749 | if (thread->last_resume_kind == resume_stop | |
183be222 | 1750 | && thread->last_status.kind () == TARGET_WAITKIND_IGNORE) |
a681f9c9 PA |
1751 | return 1; |
1752 | ||
1753 | return 0; | |
1754 | } | |
1755 | ||
df95181f TBA |
1756 | bool |
1757 | linux_process_target::status_pending_p_callback (thread_info *thread, | |
1758 | ptid_t ptid) | |
0d62e5e8 | 1759 | { |
582511be | 1760 | struct lwp_info *lp = get_thread_lwp (thread); |
95954743 PA |
1761 | |
1762 | /* Check if we're only interested in events from a specific process | |
afa8d396 | 1763 | or a specific LWP. */ |
83e1b6c1 | 1764 | if (!thread->id.matches (ptid)) |
95954743 | 1765 | return 0; |
0d62e5e8 | 1766 | |
a681f9c9 PA |
1767 | if (!lwp_resumed (lp)) |
1768 | return 0; | |
1769 | ||
582511be | 1770 | if (lp->status_pending_p |
df95181f | 1771 | && !thread_still_has_status_pending (thread)) |
582511be | 1772 | { |
df95181f | 1773 | resume_one_lwp (lp, lp->stepping, GDB_SIGNAL_0, NULL); |
582511be PA |
1774 | return 0; |
1775 | } | |
0d62e5e8 | 1776 | |
582511be | 1777 | return lp->status_pending_p; |
0d62e5e8 DJ |
1778 | } |
1779 | ||
95954743 PA |
1780 | struct lwp_info * |
1781 | find_lwp_pid (ptid_t ptid) | |
1782 | { | |
d4895ba2 SM |
1783 | long lwp = ptid.lwp () != 0 ? ptid.lwp () : ptid.pid (); |
1784 | thread_info *thread = find_thread ([lwp] (thread_info *thr_arg) | |
454296a2 | 1785 | { |
da4ae14a | 1786 | return thr_arg->id.lwp () == lwp; |
454296a2 | 1787 | }); |
d86d4aaf DE |
1788 | |
1789 | if (thread == NULL) | |
1790 | return NULL; | |
1791 | ||
9c80ecd6 | 1792 | return get_thread_lwp (thread); |
95954743 PA |
1793 | } |
1794 | ||
fa96cb38 | 1795 | /* Return the number of known LWPs in the tgid given by PID. */ |
0d62e5e8 | 1796 | |
fa96cb38 PA |
1797 | static int |
1798 | num_lwps (int pid) | |
1799 | { | |
fa96cb38 | 1800 | int count = 0; |
0d62e5e8 | 1801 | |
4d3bb80e SM |
1802 | for_each_thread (pid, [&] (thread_info *thread) |
1803 | { | |
9c80ecd6 | 1804 | count++; |
4d3bb80e | 1805 | }); |
3aee8918 | 1806 | |
fa96cb38 PA |
1807 | return count; |
1808 | } | |
d61ddec4 | 1809 | |
6d4ee8c6 GB |
1810 | /* See nat/linux-nat.h. */ |
1811 | ||
1812 | struct lwp_info * | |
1813 | iterate_over_lwps (ptid_t filter, | |
d3a70e03 | 1814 | gdb::function_view<iterate_over_lwps_ftype> callback) |
6d4ee8c6 | 1815 | { |
da4ae14a | 1816 | thread_info *thread = find_thread (filter, [&] (thread_info *thr_arg) |
6d1e5673 | 1817 | { |
da4ae14a | 1818 | lwp_info *lwp = get_thread_lwp (thr_arg); |
6d1e5673 | 1819 | |
d3a70e03 | 1820 | return callback (lwp); |
6d1e5673 | 1821 | }); |
6d4ee8c6 | 1822 | |
9c80ecd6 | 1823 | if (thread == NULL) |
6d4ee8c6 GB |
1824 | return NULL; |
1825 | ||
9c80ecd6 | 1826 | return get_thread_lwp (thread); |
6d4ee8c6 GB |
1827 | } |
1828 | ||
e8a625d1 | 1829 | bool |
fd000fb3 | 1830 | linux_process_target::check_zombie_leaders () |
fa96cb38 | 1831 | { |
e8a625d1 PA |
1832 | bool new_pending_event = false; |
1833 | ||
1834 | for_each_process ([&] (process_info *proc) | |
aa40a989 PA |
1835 | { |
1836 | pid_t leader_pid = pid_of (proc); | |
1837 | lwp_info *leader_lp = find_lwp_pid (ptid_t (leader_pid)); | |
1838 | ||
1839 | threads_debug_printf ("leader_pid=%d, leader_lp!=NULL=%d, " | |
1840 | "num_lwps=%d, zombie=%d", | |
1841 | leader_pid, leader_lp!= NULL, num_lwps (leader_pid), | |
1842 | linux_proc_pid_is_zombie (leader_pid)); | |
1843 | ||
1844 | if (leader_lp != NULL && !leader_lp->stopped | |
1845 | /* Check if there are other threads in the group, as we may | |
8a841a35 PA |
1846 | have raced with the inferior simply exiting. Note this |
1847 | isn't a watertight check. If the inferior is | |
1848 | multi-threaded and is exiting, it may be we see the | |
1849 | leader as zombie before we reap all the non-leader | |
1850 | threads. See comments below. */ | |
aa40a989 PA |
1851 | && !last_thread_of_process_p (leader_pid) |
1852 | && linux_proc_pid_is_zombie (leader_pid)) | |
1853 | { | |
8a841a35 PA |
1854 | /* A zombie leader in a multi-threaded program can mean one |
1855 | of three things: | |
1856 | ||
1857 | #1 - Only the leader exited, not the whole program, e.g., | |
1858 | with pthread_exit. Since we can't reap the leader's exit | |
1859 | status until all other threads are gone and reaped too, | |
1860 | we want to delete the zombie leader right away, as it | |
1861 | can't be debugged, we can't read its registers, etc. | |
1862 | This is the main reason we check for zombie leaders | |
1863 | disappearing. | |
1864 | ||
1865 | #2 - The whole thread-group/process exited (a group exit, | |
1866 | via e.g. exit(3), and there is (or will be shortly) an | |
1867 | exit reported for each thread in the process, and then | |
1868 | finally an exit for the leader once the non-leaders are | |
1869 | reaped. | |
1870 | ||
1871 | #3 - There are 3 or more threads in the group, and a | |
1872 | thread other than the leader exec'd. See comments on | |
1873 | exec events at the top of the file. | |
1874 | ||
1875 | Ideally we would never delete the leader for case #2. | |
1876 | Instead, we want to collect the exit status of each | |
1877 | non-leader thread, and then finally collect the exit | |
1878 | status of the leader as normal and use its exit code as | |
1879 | whole-process exit code. Unfortunately, there's no | |
1880 | race-free way to distinguish cases #1 and #2. We can't | |
1881 | assume the exit events for the non-leaders threads are | |
1882 | already pending in the kernel, nor can we assume the | |
1883 | non-leader threads are in zombie state already. Between | |
1884 | the leader becoming zombie and the non-leaders exiting | |
1885 | and becoming zombie themselves, there's a small time | |
1886 | window, so such a check would be racy. Temporarily | |
1887 | pausing all threads and checking to see if all threads | |
1888 | exit or not before re-resuming them would work in the | |
1889 | case that all threads are running right now, but it | |
1890 | wouldn't work if some thread is currently already | |
1891 | ptrace-stopped, e.g., due to scheduler-locking. | |
1892 | ||
1893 | So what we do is we delete the leader anyhow, and then | |
1894 | later on when we see its exit status, we re-add it back. | |
1895 | We also make sure that we only report a whole-process | |
1896 | exit when we see the leader exiting, as opposed to when | |
1897 | the last LWP in the LWP list exits, which can be a | |
1898 | non-leader if we deleted the leader here. */ | |
aa40a989 | 1899 | threads_debug_printf ("Thread group leader %d zombie " |
8a841a35 PA |
1900 | "(it exited, or another thread execd), " |
1901 | "deleting it.", | |
aa40a989 | 1902 | leader_pid); |
e8a625d1 PA |
1903 | |
1904 | thread_info *leader_thread = get_lwp_thread (leader_lp); | |
1905 | if (report_exit_events_for (leader_thread)) | |
1906 | { | |
1907 | mark_lwp_dead (leader_lp, W_EXITCODE (0, 0), true); | |
1908 | new_pending_event = true; | |
1909 | } | |
1910 | else | |
1911 | delete_lwp (leader_lp); | |
aa40a989 | 1912 | } |
9179355e | 1913 | }); |
e8a625d1 PA |
1914 | |
1915 | return new_pending_event; | |
fa96cb38 | 1916 | } |
c3adc08c | 1917 | |
a1385b7b SM |
1918 | /* Callback for `find_thread'. Returns the first LWP that is not |
1919 | stopped. */ | |
d50171e4 | 1920 | |
a1385b7b SM |
1921 | static bool |
1922 | not_stopped_callback (thread_info *thread, ptid_t filter) | |
fa96cb38 | 1923 | { |
a1385b7b SM |
1924 | if (!thread->id.matches (filter)) |
1925 | return false; | |
47c0c975 | 1926 | |
a1385b7b | 1927 | lwp_info *lwp = get_thread_lwp (thread); |
fa96cb38 | 1928 | |
a1385b7b | 1929 | return !lwp->stopped; |
0d62e5e8 | 1930 | } |
611cb4a5 | 1931 | |
863d01bd PA |
1932 | /* Increment LWP's suspend count. */ |
1933 | ||
1934 | static void | |
1935 | lwp_suspended_inc (struct lwp_info *lwp) | |
1936 | { | |
1937 | lwp->suspended++; | |
1938 | ||
c058728c SM |
1939 | if (lwp->suspended > 4) |
1940 | threads_debug_printf | |
1941 | ("LWP %ld has a suspiciously high suspend count, suspended=%d", | |
1942 | lwpid_of (get_lwp_thread (lwp)), lwp->suspended); | |
863d01bd PA |
1943 | } |
1944 | ||
1945 | /* Decrement LWP's suspend count. */ | |
1946 | ||
1947 | static void | |
1948 | lwp_suspended_decr (struct lwp_info *lwp) | |
1949 | { | |
1950 | lwp->suspended--; | |
1951 | ||
1952 | if (lwp->suspended < 0) | |
1953 | { | |
1954 | struct thread_info *thread = get_lwp_thread (lwp); | |
1955 | ||
f34652de | 1956 | internal_error ("unsuspend LWP %ld, suspended=%d\n", lwpid_of (thread), |
863d01bd PA |
1957 | lwp->suspended); |
1958 | } | |
1959 | } | |
1960 | ||
219f2f23 PA |
1961 | /* This function should only be called if the LWP got a SIGTRAP. |
1962 | ||
1963 | Handle any tracepoint steps or hits. Return true if a tracepoint | |
1964 | event was handled, 0 otherwise. */ | |
1965 | ||
1966 | static int | |
1967 | handle_tracepoints (struct lwp_info *lwp) | |
1968 | { | |
1969 | struct thread_info *tinfo = get_lwp_thread (lwp); | |
1970 | int tpoint_related_event = 0; | |
1971 | ||
582511be PA |
1972 | gdb_assert (lwp->suspended == 0); |
1973 | ||
7984d532 PA |
1974 | /* If this tracepoint hit causes a tracing stop, we'll immediately |
1975 | uninsert tracepoints. To do this, we temporarily pause all | |
1976 | threads, unpatch away, and then unpause threads. We need to make | |
1977 | sure the unpausing doesn't resume LWP too. */ | |
863d01bd | 1978 | lwp_suspended_inc (lwp); |
7984d532 | 1979 | |
219f2f23 PA |
1980 | /* And we need to be sure that any all-threads-stopping doesn't try |
1981 | to move threads out of the jump pads, as it could deadlock the | |
1982 | inferior (LWP could be in the jump pad, maybe even holding the | |
1983 | lock.) */ | |
1984 | ||
1985 | /* Do any necessary step collect actions. */ | |
1986 | tpoint_related_event |= tracepoint_finished_step (tinfo, lwp->stop_pc); | |
1987 | ||
fa593d66 PA |
1988 | tpoint_related_event |= handle_tracepoint_bkpts (tinfo, lwp->stop_pc); |
1989 | ||
219f2f23 PA |
1990 | /* See if we just hit a tracepoint and do its main collect |
1991 | actions. */ | |
1992 | tpoint_related_event |= tracepoint_was_hit (tinfo, lwp->stop_pc); | |
1993 | ||
863d01bd | 1994 | lwp_suspended_decr (lwp); |
7984d532 PA |
1995 | |
1996 | gdb_assert (lwp->suspended == 0); | |
229d26fc SM |
1997 | gdb_assert (!stabilizing_threads |
1998 | || (lwp->collecting_fast_tracepoint | |
1999 | != fast_tpoint_collect_result::not_collecting)); | |
7984d532 | 2000 | |
219f2f23 PA |
2001 | if (tpoint_related_event) |
2002 | { | |
c058728c | 2003 | threads_debug_printf ("got a tracepoint event"); |
219f2f23 PA |
2004 | return 1; |
2005 | } | |
2006 | ||
2007 | return 0; | |
2008 | } | |
2009 | ||
13e567af TBA |
2010 | fast_tpoint_collect_result |
2011 | linux_process_target::linux_fast_tracepoint_collecting | |
2012 | (lwp_info *lwp, fast_tpoint_collect_status *status) | |
fa593d66 PA |
2013 | { |
2014 | CORE_ADDR thread_area; | |
d86d4aaf | 2015 | struct thread_info *thread = get_lwp_thread (lwp); |
fa593d66 | 2016 | |
fa593d66 PA |
2017 | /* Get the thread area address. This is used to recognize which |
2018 | thread is which when tracing with the in-process agent library. | |
2019 | We don't read anything from the address, and treat it as opaque; | |
2020 | it's the address itself that we assume is unique per-thread. */ | |
13e567af | 2021 | if (low_get_thread_area (lwpid_of (thread), &thread_area) == -1) |
229d26fc | 2022 | return fast_tpoint_collect_result::not_collecting; |
fa593d66 PA |
2023 | |
2024 | return fast_tracepoint_collecting (thread_area, lwp->stop_pc, status); | |
2025 | } | |
2026 | ||
13e567af TBA |
2027 | int |
2028 | linux_process_target::low_get_thread_area (int lwpid, CORE_ADDR *addrp) | |
2029 | { | |
2030 | return -1; | |
2031 | } | |
2032 | ||
d16f3f6c TBA |
2033 | bool |
2034 | linux_process_target::maybe_move_out_of_jump_pad (lwp_info *lwp, int *wstat) | |
fa593d66 | 2035 | { |
24583e45 TBA |
2036 | scoped_restore_current_thread restore_thread; |
2037 | switch_to_thread (get_lwp_thread (lwp)); | |
fa593d66 PA |
2038 | |
2039 | if ((wstat == NULL | |
2040 | || (WIFSTOPPED (*wstat) && WSTOPSIG (*wstat) != SIGTRAP)) | |
2041 | && supports_fast_tracepoints () | |
58b4daa5 | 2042 | && agent_loaded_p ()) |
fa593d66 PA |
2043 | { |
2044 | struct fast_tpoint_collect_status status; | |
fa593d66 | 2045 | |
c058728c SM |
2046 | threads_debug_printf |
2047 | ("Checking whether LWP %ld needs to move out of the jump pad.", | |
2048 | lwpid_of (current_thread)); | |
fa593d66 | 2049 | |
229d26fc SM |
2050 | fast_tpoint_collect_result r |
2051 | = linux_fast_tracepoint_collecting (lwp, &status); | |
fa593d66 PA |
2052 | |
2053 | if (wstat == NULL | |
2054 | || (WSTOPSIG (*wstat) != SIGILL | |
2055 | && WSTOPSIG (*wstat) != SIGFPE | |
2056 | && WSTOPSIG (*wstat) != SIGSEGV | |
2057 | && WSTOPSIG (*wstat) != SIGBUS)) | |
2058 | { | |
2059 | lwp->collecting_fast_tracepoint = r; | |
2060 | ||
229d26fc | 2061 | if (r != fast_tpoint_collect_result::not_collecting) |
fa593d66 | 2062 | { |
229d26fc SM |
2063 | if (r == fast_tpoint_collect_result::before_insn |
2064 | && lwp->exit_jump_pad_bkpt == NULL) | |
fa593d66 PA |
2065 | { |
2066 | /* Haven't executed the original instruction yet. | |
2067 | Set breakpoint there, and wait till it's hit, | |
2068 | then single-step until exiting the jump pad. */ | |
2069 | lwp->exit_jump_pad_bkpt | |
2070 | = set_breakpoint_at (status.adjusted_insn_addr, NULL); | |
2071 | } | |
2072 | ||
c058728c SM |
2073 | threads_debug_printf |
2074 | ("Checking whether LWP %ld needs to move out of the jump pad..." | |
2075 | " it does", lwpid_of (current_thread)); | |
fa593d66 | 2076 | |
d16f3f6c | 2077 | return true; |
fa593d66 PA |
2078 | } |
2079 | } | |
2080 | else | |
2081 | { | |
2082 | /* If we get a synchronous signal while collecting, *and* | |
2083 | while executing the (relocated) original instruction, | |
2084 | reset the PC to point at the tpoint address, before | |
2085 | reporting to GDB. Otherwise, it's an IPA lib bug: just | |
2086 | report the signal to GDB, and pray for the best. */ | |
2087 | ||
229d26fc SM |
2088 | lwp->collecting_fast_tracepoint |
2089 | = fast_tpoint_collect_result::not_collecting; | |
fa593d66 | 2090 | |
229d26fc | 2091 | if (r != fast_tpoint_collect_result::not_collecting |
fa593d66 PA |
2092 | && (status.adjusted_insn_addr <= lwp->stop_pc |
2093 | && lwp->stop_pc < status.adjusted_insn_addr_end)) | |
2094 | { | |
2095 | siginfo_t info; | |
2096 | struct regcache *regcache; | |
2097 | ||
2098 | /* The si_addr on a few signals references the address | |
2099 | of the faulting instruction. Adjust that as | |
2100 | well. */ | |
2101 | if ((WSTOPSIG (*wstat) == SIGILL | |
2102 | || WSTOPSIG (*wstat) == SIGFPE | |
2103 | || WSTOPSIG (*wstat) == SIGBUS | |
2104 | || WSTOPSIG (*wstat) == SIGSEGV) | |
0bfdf32f | 2105 | && ptrace (PTRACE_GETSIGINFO, lwpid_of (current_thread), |
b8e1b30e | 2106 | (PTRACE_TYPE_ARG3) 0, &info) == 0 |
fa593d66 PA |
2107 | /* Final check just to make sure we don't clobber |
2108 | the siginfo of non-kernel-sent signals. */ | |
2109 | && (uintptr_t) info.si_addr == lwp->stop_pc) | |
2110 | { | |
2111 | info.si_addr = (void *) (uintptr_t) status.tpoint_addr; | |
0bfdf32f | 2112 | ptrace (PTRACE_SETSIGINFO, lwpid_of (current_thread), |
b8e1b30e | 2113 | (PTRACE_TYPE_ARG3) 0, &info); |
fa593d66 PA |
2114 | } |
2115 | ||
0bfdf32f | 2116 | regcache = get_thread_regcache (current_thread, 1); |
bf9ae9d8 | 2117 | low_set_pc (regcache, status.tpoint_addr); |
fa593d66 PA |
2118 | lwp->stop_pc = status.tpoint_addr; |
2119 | ||
2120 | /* Cancel any fast tracepoint lock this thread was | |
2121 | holding. */ | |
2122 | force_unlock_trace_buffer (); | |
2123 | } | |
2124 | ||
2125 | if (lwp->exit_jump_pad_bkpt != NULL) | |
2126 | { | |
c058728c SM |
2127 | threads_debug_printf |
2128 | ("Cancelling fast exit-jump-pad: removing bkpt." | |
2129 | "stopping all threads momentarily."); | |
fa593d66 PA |
2130 | |
2131 | stop_all_lwps (1, lwp); | |
fa593d66 PA |
2132 | |
2133 | delete_breakpoint (lwp->exit_jump_pad_bkpt); | |
2134 | lwp->exit_jump_pad_bkpt = NULL; | |
2135 | ||
2136 | unstop_all_lwps (1, lwp); | |
2137 | ||
2138 | gdb_assert (lwp->suspended >= 0); | |
2139 | } | |
2140 | } | |
2141 | } | |
2142 | ||
c058728c SM |
2143 | threads_debug_printf |
2144 | ("Checking whether LWP %ld needs to move out of the jump pad... no", | |
2145 | lwpid_of (current_thread)); | |
0cccb683 | 2146 | |
d16f3f6c | 2147 | return false; |
fa593d66 PA |
2148 | } |
2149 | ||
2150 | /* Enqueue one signal in the "signals to report later when out of the | |
2151 | jump pad" list. */ | |
2152 | ||
2153 | static void | |
2154 | enqueue_one_deferred_signal (struct lwp_info *lwp, int *wstat) | |
2155 | { | |
d86d4aaf | 2156 | struct thread_info *thread = get_lwp_thread (lwp); |
fa593d66 | 2157 | |
c058728c SM |
2158 | threads_debug_printf ("Deferring signal %d for LWP %ld.", |
2159 | WSTOPSIG (*wstat), lwpid_of (thread)); | |
fa593d66 PA |
2160 | |
2161 | if (debug_threads) | |
2162 | { | |
013e3554 | 2163 | for (const auto &sig : lwp->pending_signals_to_report) |
c058728c | 2164 | threads_debug_printf (" Already queued %d", sig.signal); |
fa593d66 | 2165 | |
c058728c | 2166 | threads_debug_printf (" (no more currently queued signals)"); |
fa593d66 PA |
2167 | } |
2168 | ||
1a981360 PA |
2169 | /* Don't enqueue non-RT signals if they are already in the deferred |
2170 | queue. (SIGSTOP being the easiest signal to see ending up here | |
2171 | twice) */ | |
2172 | if (WSTOPSIG (*wstat) < __SIGRTMIN) | |
2173 | { | |
013e3554 | 2174 | for (const auto &sig : lwp->pending_signals_to_report) |
1a981360 | 2175 | { |
013e3554 | 2176 | if (sig.signal == WSTOPSIG (*wstat)) |
1a981360 | 2177 | { |
c058728c SM |
2178 | threads_debug_printf |
2179 | ("Not requeuing already queued non-RT signal %d for LWP %ld", | |
2180 | sig.signal, lwpid_of (thread)); | |
1a981360 PA |
2181 | return; |
2182 | } | |
2183 | } | |
2184 | } | |
2185 | ||
013e3554 | 2186 | lwp->pending_signals_to_report.emplace_back (WSTOPSIG (*wstat)); |
8d749320 | 2187 | |
d86d4aaf | 2188 | ptrace (PTRACE_GETSIGINFO, lwpid_of (thread), (PTRACE_TYPE_ARG3) 0, |
013e3554 | 2189 | &lwp->pending_signals_to_report.back ().info); |
fa593d66 PA |
2190 | } |
2191 | ||
2192 | /* Dequeue one signal from the "signals to report later when out of | |
2193 | the jump pad" list. */ | |
2194 | ||
2195 | static int | |
2196 | dequeue_one_deferred_signal (struct lwp_info *lwp, int *wstat) | |
2197 | { | |
d86d4aaf DE |
2198 | struct thread_info *thread = get_lwp_thread (lwp); |
2199 | ||
013e3554 | 2200 | if (!lwp->pending_signals_to_report.empty ()) |
fa593d66 | 2201 | { |
013e3554 | 2202 | const pending_signal &p_sig = lwp->pending_signals_to_report.front (); |
fa593d66 | 2203 | |
013e3554 TBA |
2204 | *wstat = W_STOPCODE (p_sig.signal); |
2205 | if (p_sig.info.si_signo != 0) | |
d86d4aaf | 2206 | ptrace (PTRACE_SETSIGINFO, lwpid_of (thread), (PTRACE_TYPE_ARG3) 0, |
013e3554 TBA |
2207 | &p_sig.info); |
2208 | ||
2209 | lwp->pending_signals_to_report.pop_front (); | |
fa593d66 | 2210 | |
c058728c SM |
2211 | threads_debug_printf ("Reporting deferred signal %d for LWP %ld.", |
2212 | WSTOPSIG (*wstat), lwpid_of (thread)); | |
fa593d66 PA |
2213 | |
2214 | if (debug_threads) | |
2215 | { | |
013e3554 | 2216 | for (const auto &sig : lwp->pending_signals_to_report) |
c058728c | 2217 | threads_debug_printf (" Still queued %d", sig.signal); |
fa593d66 | 2218 | |
c058728c | 2219 | threads_debug_printf (" (no more queued signals)"); |
fa593d66 PA |
2220 | } |
2221 | ||
2222 | return 1; | |
2223 | } | |
2224 | ||
2225 | return 0; | |
2226 | } | |
2227 | ||
ac1bbaca TBA |
2228 | bool |
2229 | linux_process_target::check_stopped_by_watchpoint (lwp_info *child) | |
582511be | 2230 | { |
24583e45 TBA |
2231 | scoped_restore_current_thread restore_thread; |
2232 | switch_to_thread (get_lwp_thread (child)); | |
d50171e4 | 2233 | |
ac1bbaca TBA |
2234 | if (low_stopped_by_watchpoint ()) |
2235 | { | |
2236 | child->stop_reason = TARGET_STOPPED_BY_WATCHPOINT; | |
2237 | child->stopped_data_address = low_stopped_data_address (); | |
2238 | } | |
582511be | 2239 | |
ac1bbaca TBA |
2240 | return child->stop_reason == TARGET_STOPPED_BY_WATCHPOINT; |
2241 | } | |
d50171e4 | 2242 | |
ac1bbaca TBA |
2243 | bool |
2244 | linux_process_target::low_stopped_by_watchpoint () | |
2245 | { | |
2246 | return false; | |
2247 | } | |
d50171e4 | 2248 | |
ac1bbaca TBA |
2249 | CORE_ADDR |
2250 | linux_process_target::low_stopped_data_address () | |
2251 | { | |
2252 | return 0; | |
c4d9ceb6 YQ |
2253 | } |
2254 | ||
de0d863e DB |
2255 | /* Return the ptrace options that we want to try to enable. */ |
2256 | ||
2257 | static int | |
2258 | linux_low_ptrace_options (int attached) | |
2259 | { | |
c12a5089 | 2260 | client_state &cs = get_client_state (); |
de0d863e DB |
2261 | int options = 0; |
2262 | ||
2263 | if (!attached) | |
2264 | options |= PTRACE_O_EXITKILL; | |
2265 | ||
c12a5089 | 2266 | if (cs.report_fork_events) |
de0d863e DB |
2267 | options |= PTRACE_O_TRACEFORK; |
2268 | ||
c12a5089 | 2269 | if (cs.report_vfork_events) |
c269dbdb DB |
2270 | options |= (PTRACE_O_TRACEVFORK | PTRACE_O_TRACEVFORKDONE); |
2271 | ||
c12a5089 | 2272 | if (cs.report_exec_events) |
94585166 DB |
2273 | options |= PTRACE_O_TRACEEXEC; |
2274 | ||
82075af2 JS |
2275 | options |= PTRACE_O_TRACESYSGOOD; |
2276 | ||
de0d863e DB |
2277 | return options; |
2278 | } | |
2279 | ||
1a48f002 | 2280 | void |
d16f3f6c | 2281 | linux_process_target::filter_event (int lwpid, int wstat) |
fa96cb38 PA |
2282 | { |
2283 | struct lwp_info *child; | |
2284 | struct thread_info *thread; | |
582511be | 2285 | int have_stop_pc = 0; |
fa96cb38 | 2286 | |
f2907e49 | 2287 | child = find_lwp_pid (ptid_t (lwpid)); |
fa96cb38 | 2288 | |
5406bc3f PA |
2289 | /* Check for events reported by anything not in our LWP list. */ |
2290 | if (child == nullptr) | |
94585166 | 2291 | { |
5406bc3f PA |
2292 | if (WIFSTOPPED (wstat)) |
2293 | { | |
2294 | if (WSTOPSIG (wstat) == SIGTRAP | |
2295 | && linux_ptrace_get_extended_event (wstat) == PTRACE_EVENT_EXEC) | |
2296 | { | |
2297 | /* A non-leader thread exec'ed after we've seen the | |
2298 | leader zombie, and removed it from our lists (in | |
2299 | check_zombie_leaders). The non-leader thread changes | |
2300 | its tid to the tgid. */ | |
2301 | threads_debug_printf | |
2302 | ("Re-adding thread group leader LWP %d after exec.", | |
2303 | lwpid); | |
94585166 | 2304 | |
5406bc3f PA |
2305 | child = add_lwp (ptid_t (lwpid, lwpid)); |
2306 | child->stopped = 1; | |
2307 | switch_to_thread (child->thread); | |
2308 | } | |
2309 | else | |
2310 | { | |
2311 | /* A process we are controlling has forked and the new | |
2312 | child's stop was reported to us by the kernel. Save | |
2313 | its PID and go back to waiting for the fork event to | |
2314 | be reported - the stopped process might be returned | |
2315 | from waitpid before or after the fork event is. */ | |
2316 | threads_debug_printf | |
2317 | ("Saving LWP %d status %s in stopped_pids list", | |
2318 | lwpid, status_to_str (wstat).c_str ()); | |
2319 | add_to_pid_list (&stopped_pids, lwpid, wstat); | |
2320 | } | |
2321 | } | |
2322 | else | |
2323 | { | |
2324 | /* Don't report an event for the exit of an LWP not in our | |
2325 | list, i.e. not part of any inferior we're debugging. | |
2326 | This can happen if we detach from a program we originally | |
8a841a35 PA |
2327 | forked and then it exits. However, note that we may have |
2328 | earlier deleted a leader of an inferior we're debugging, | |
2329 | in check_zombie_leaders. Re-add it back here if so. */ | |
2330 | find_process ([&] (process_info *proc) | |
2331 | { | |
2332 | if (proc->pid == lwpid) | |
2333 | { | |
2334 | threads_debug_printf | |
2335 | ("Re-adding thread group leader LWP %d after exit.", | |
2336 | lwpid); | |
2337 | ||
2338 | child = add_lwp (ptid_t (lwpid, lwpid)); | |
2339 | return true; | |
2340 | } | |
2341 | return false; | |
2342 | }); | |
5406bc3f | 2343 | } |
94585166 | 2344 | |
5406bc3f PA |
2345 | if (child == nullptr) |
2346 | return; | |
fa96cb38 | 2347 | } |
fa96cb38 PA |
2348 | |
2349 | thread = get_lwp_thread (child); | |
2350 | ||
2351 | child->stopped = 1; | |
2352 | ||
2353 | child->last_status = wstat; | |
2354 | ||
582511be PA |
2355 | /* Check if the thread has exited. */ |
2356 | if ((WIFEXITED (wstat) || WIFSIGNALED (wstat))) | |
2357 | { | |
c058728c | 2358 | threads_debug_printf ("%d exited", lwpid); |
f50bf8e5 YQ |
2359 | |
2360 | if (finish_step_over (child)) | |
2361 | { | |
2362 | /* Unsuspend all other LWPs, and set them back running again. */ | |
2363 | unsuspend_all_lwps (child); | |
2364 | } | |
2365 | ||
8a841a35 PA |
2366 | /* If this is not the leader LWP, then the exit signal was not |
2367 | the end of the debugged application and should be ignored, | |
2368 | unless GDB wants to hear about thread exits. */ | |
48989498 | 2369 | if (report_exit_events_for (thread) || is_leader (thread)) |
582511be | 2370 | { |
65706a29 PA |
2371 | /* Since events are serialized to GDB core, and we can't |
2372 | report this one right now. Leave the status pending for | |
2373 | the next time we're able to report it. */ | |
e8a625d1 | 2374 | mark_lwp_dead (child, wstat, false); |
1a48f002 | 2375 | return; |
582511be PA |
2376 | } |
2377 | else | |
2378 | { | |
65706a29 | 2379 | delete_lwp (child); |
1a48f002 | 2380 | return; |
582511be PA |
2381 | } |
2382 | } | |
2383 | ||
2384 | gdb_assert (WIFSTOPPED (wstat)); | |
2385 | ||
fa96cb38 PA |
2386 | if (WIFSTOPPED (wstat)) |
2387 | { | |
2388 | struct process_info *proc; | |
2389 | ||
c06cbd92 | 2390 | /* Architecture-specific setup after inferior is running. */ |
fa96cb38 | 2391 | proc = find_process_pid (pid_of (thread)); |
c06cbd92 | 2392 | if (proc->tdesc == NULL) |
fa96cb38 | 2393 | { |
c06cbd92 YQ |
2394 | if (proc->attached) |
2395 | { | |
c06cbd92 YQ |
2396 | /* This needs to happen after we have attached to the |
2397 | inferior and it is stopped for the first time, but | |
2398 | before we access any inferior registers. */ | |
797bcff5 | 2399 | arch_setup_thread (thread); |
c06cbd92 YQ |
2400 | } |
2401 | else | |
2402 | { | |
2403 | /* The process is started, but GDBserver will do | |
2404 | architecture-specific setup after the program stops at | |
2405 | the first instruction. */ | |
2406 | child->status_pending_p = 1; | |
2407 | child->status_pending = wstat; | |
1a48f002 | 2408 | return; |
c06cbd92 | 2409 | } |
fa96cb38 PA |
2410 | } |
2411 | } | |
2412 | ||
fa96cb38 PA |
2413 | if (WIFSTOPPED (wstat) && child->must_set_ptrace_flags) |
2414 | { | |
beed38b8 | 2415 | struct process_info *proc = find_process_pid (pid_of (thread)); |
de0d863e | 2416 | int options = linux_low_ptrace_options (proc->attached); |
beed38b8 | 2417 | |
de0d863e | 2418 | linux_enable_event_reporting (lwpid, options); |
fa96cb38 PA |
2419 | child->must_set_ptrace_flags = 0; |
2420 | } | |
2421 | ||
82075af2 JS |
2422 | /* Always update syscall_state, even if it will be filtered later. */ |
2423 | if (WIFSTOPPED (wstat) && WSTOPSIG (wstat) == SYSCALL_SIGTRAP) | |
2424 | { | |
2425 | child->syscall_state | |
2426 | = (child->syscall_state == TARGET_WAITKIND_SYSCALL_ENTRY | |
2427 | ? TARGET_WAITKIND_SYSCALL_RETURN | |
2428 | : TARGET_WAITKIND_SYSCALL_ENTRY); | |
2429 | } | |
2430 | else | |
2431 | { | |
2432 | /* Almost all other ptrace-stops are known to be outside of system | |
2433 | calls, with further exceptions in handle_extended_wait. */ | |
2434 | child->syscall_state = TARGET_WAITKIND_IGNORE; | |
2435 | } | |
2436 | ||
e7ad2f14 PA |
2437 | /* Be careful to not overwrite stop_pc until save_stop_reason is |
2438 | called. */ | |
fa96cb38 | 2439 | if (WIFSTOPPED (wstat) && WSTOPSIG (wstat) == SIGTRAP |
89a5711c | 2440 | && linux_is_extended_waitstatus (wstat)) |
fa96cb38 | 2441 | { |
582511be | 2442 | child->stop_pc = get_pc (child); |
94585166 | 2443 | if (handle_extended_wait (&child, wstat)) |
de0d863e DB |
2444 | { |
2445 | /* The event has been handled, so just return without | |
2446 | reporting it. */ | |
1a48f002 | 2447 | return; |
de0d863e | 2448 | } |
fa96cb38 PA |
2449 | } |
2450 | ||
80aea927 | 2451 | if (linux_wstatus_maybe_breakpoint (wstat)) |
582511be | 2452 | { |
e7ad2f14 | 2453 | if (save_stop_reason (child)) |
582511be PA |
2454 | have_stop_pc = 1; |
2455 | } | |
2456 | ||
2457 | if (!have_stop_pc) | |
2458 | child->stop_pc = get_pc (child); | |
2459 | ||
fa96cb38 PA |
2460 | if (WIFSTOPPED (wstat) && WSTOPSIG (wstat) == SIGSTOP |
2461 | && child->stop_expected) | |
2462 | { | |
c058728c SM |
2463 | threads_debug_printf ("Expected stop."); |
2464 | ||
fa96cb38 PA |
2465 | child->stop_expected = 0; |
2466 | ||
2467 | if (thread->last_resume_kind == resume_stop) | |
2468 | { | |
2469 | /* We want to report the stop to the core. Treat the | |
2470 | SIGSTOP as a normal event. */ | |
c058728c SM |
2471 | threads_debug_printf ("resume_stop SIGSTOP caught for %s.", |
2472 | target_pid_to_str (ptid_of (thread)).c_str ()); | |
fa96cb38 PA |
2473 | } |
2474 | else if (stopping_threads != NOT_STOPPING_THREADS) | |
2475 | { | |
2476 | /* Stopping threads. We don't want this SIGSTOP to end up | |
582511be | 2477 | pending. */ |
c058728c SM |
2478 | threads_debug_printf ("SIGSTOP caught for %s while stopping threads.", |
2479 | target_pid_to_str (ptid_of (thread)).c_str ()); | |
1a48f002 | 2480 | return; |
fa96cb38 PA |
2481 | } |
2482 | else | |
2483 | { | |
2bf6fb9d | 2484 | /* This is a delayed SIGSTOP. Filter out the event. */ |
c058728c | 2485 | threads_debug_printf ("%s %s, 0, 0 (discard delayed SIGSTOP)", |
2bf6fb9d | 2486 | child->stepping ? "step" : "continue", |
61d7f128 | 2487 | target_pid_to_str (ptid_of (thread)).c_str ()); |
2bf6fb9d | 2488 | |
df95181f | 2489 | resume_one_lwp (child, child->stepping, 0, NULL); |
1a48f002 | 2490 | return; |
fa96cb38 PA |
2491 | } |
2492 | } | |
2493 | ||
582511be PA |
2494 | child->status_pending_p = 1; |
2495 | child->status_pending = wstat; | |
1a48f002 | 2496 | return; |
fa96cb38 PA |
2497 | } |
2498 | ||
b31cdfa6 TBA |
2499 | bool |
2500 | linux_process_target::maybe_hw_step (thread_info *thread) | |
f79b145d | 2501 | { |
b31cdfa6 TBA |
2502 | if (supports_hardware_single_step ()) |
2503 | return true; | |
f79b145d YQ |
2504 | else |
2505 | { | |
3b9a79ef | 2506 | /* GDBserver must insert single-step breakpoint for software |
f79b145d | 2507 | single step. */ |
3b9a79ef | 2508 | gdb_assert (has_single_step_breakpoints (thread)); |
b31cdfa6 | 2509 | return false; |
f79b145d YQ |
2510 | } |
2511 | } | |
2512 | ||
df95181f TBA |
2513 | void |
2514 | linux_process_target::resume_stopped_resumed_lwps (thread_info *thread) | |
20ba1ce6 | 2515 | { |
20ba1ce6 PA |
2516 | struct lwp_info *lp = get_thread_lwp (thread); |
2517 | ||
2518 | if (lp->stopped | |
863d01bd | 2519 | && !lp->suspended |
20ba1ce6 | 2520 | && !lp->status_pending_p |
183be222 | 2521 | && thread->last_status.kind () == TARGET_WAITKIND_IGNORE) |
20ba1ce6 | 2522 | { |
8901d193 YQ |
2523 | int step = 0; |
2524 | ||
2525 | if (thread->last_resume_kind == resume_step) | |
b6d8d612 KB |
2526 | { |
2527 | if (supports_software_single_step ()) | |
2528 | install_software_single_step_breakpoints (lp); | |
2529 | ||
2530 | step = maybe_hw_step (thread); | |
2531 | } | |
20ba1ce6 | 2532 | |
c058728c SM |
2533 | threads_debug_printf ("resuming stopped-resumed LWP %s at %s: step=%d", |
2534 | target_pid_to_str (ptid_of (thread)).c_str (), | |
2535 | paddress (lp->stop_pc), step); | |
20ba1ce6 | 2536 | |
df95181f | 2537 | resume_one_lwp (lp, step, GDB_SIGNAL_0, NULL); |
20ba1ce6 PA |
2538 | } |
2539 | } | |
2540 | ||
d16f3f6c TBA |
2541 | int |
2542 | linux_process_target::wait_for_event_filtered (ptid_t wait_ptid, | |
2543 | ptid_t filter_ptid, | |
2544 | int *wstatp, int options) | |
0d62e5e8 | 2545 | { |
d86d4aaf | 2546 | struct thread_info *event_thread; |
d50171e4 | 2547 | struct lwp_info *event_child, *requested_child; |
fa96cb38 | 2548 | sigset_t block_mask, prev_mask; |
d50171e4 | 2549 | |
fa96cb38 | 2550 | retry: |
d86d4aaf DE |
2551 | /* N.B. event_thread points to the thread_info struct that contains |
2552 | event_child. Keep them in sync. */ | |
2553 | event_thread = NULL; | |
d50171e4 PA |
2554 | event_child = NULL; |
2555 | requested_child = NULL; | |
0d62e5e8 | 2556 | |
95954743 | 2557 | /* Check for a lwp with a pending status. */ |
bd99dc85 | 2558 | |
d7e15655 | 2559 | if (filter_ptid == minus_one_ptid || filter_ptid.is_pid ()) |
0d62e5e8 | 2560 | { |
83e1b6c1 SM |
2561 | event_thread = find_thread_in_random ([&] (thread_info *thread) |
2562 | { | |
2563 | return status_pending_p_callback (thread, filter_ptid); | |
2564 | }); | |
2565 | ||
d86d4aaf | 2566 | if (event_thread != NULL) |
c058728c SM |
2567 | { |
2568 | event_child = get_thread_lwp (event_thread); | |
2569 | threads_debug_printf ("Got a pending child %ld", lwpid_of (event_thread)); | |
2570 | } | |
0d62e5e8 | 2571 | } |
d7e15655 | 2572 | else if (filter_ptid != null_ptid) |
0d62e5e8 | 2573 | { |
fa96cb38 | 2574 | requested_child = find_lwp_pid (filter_ptid); |
59487af3 | 2575 | gdb_assert (requested_child != nullptr); |
d50171e4 | 2576 | |
bde24c0a | 2577 | if (stopping_threads == NOT_STOPPING_THREADS |
fa593d66 | 2578 | && requested_child->status_pending_p |
229d26fc SM |
2579 | && (requested_child->collecting_fast_tracepoint |
2580 | != fast_tpoint_collect_result::not_collecting)) | |
fa593d66 PA |
2581 | { |
2582 | enqueue_one_deferred_signal (requested_child, | |
2583 | &requested_child->status_pending); | |
2584 | requested_child->status_pending_p = 0; | |
2585 | requested_child->status_pending = 0; | |
df95181f | 2586 | resume_one_lwp (requested_child, 0, 0, NULL); |
fa593d66 PA |
2587 | } |
2588 | ||
2589 | if (requested_child->suspended | |
2590 | && requested_child->status_pending_p) | |
38e08fca | 2591 | { |
f34652de | 2592 | internal_error ("requesting an event out of a" |
38e08fca GB |
2593 | " suspended child?"); |
2594 | } | |
fa593d66 | 2595 | |
d50171e4 | 2596 | if (requested_child->status_pending_p) |
d86d4aaf DE |
2597 | { |
2598 | event_child = requested_child; | |
2599 | event_thread = get_lwp_thread (event_child); | |
2600 | } | |
0d62e5e8 | 2601 | } |
611cb4a5 | 2602 | |
0d62e5e8 DJ |
2603 | if (event_child != NULL) |
2604 | { | |
c058728c SM |
2605 | threads_debug_printf ("Got an event from pending child %ld (%04x)", |
2606 | lwpid_of (event_thread), | |
2607 | event_child->status_pending); | |
2608 | ||
fa96cb38 | 2609 | *wstatp = event_child->status_pending; |
bd99dc85 PA |
2610 | event_child->status_pending_p = 0; |
2611 | event_child->status_pending = 0; | |
24583e45 | 2612 | switch_to_thread (event_thread); |
d86d4aaf | 2613 | return lwpid_of (event_thread); |
0d62e5e8 DJ |
2614 | } |
2615 | ||
fa96cb38 PA |
2616 | /* But if we don't find a pending event, we'll have to wait. |
2617 | ||
2618 | We only enter this loop if no process has a pending wait status. | |
2619 | Thus any action taken in response to a wait status inside this | |
2620 | loop is responding as soon as we detect the status, not after any | |
2621 | pending events. */ | |
d8301ad1 | 2622 | |
fa96cb38 PA |
2623 | /* Make sure SIGCHLD is blocked until the sigsuspend below. Block |
2624 | all signals while here. */ | |
2625 | sigfillset (&block_mask); | |
21987b9c | 2626 | gdb_sigmask (SIG_BLOCK, &block_mask, &prev_mask); |
fa96cb38 | 2627 | |
582511be PA |
2628 | /* Always pull all events out of the kernel. We'll randomly select |
2629 | an event LWP out of all that have events, to prevent | |
2630 | starvation. */ | |
fa96cb38 | 2631 | while (event_child == NULL) |
0d62e5e8 | 2632 | { |
fa96cb38 | 2633 | pid_t ret = 0; |
0d62e5e8 | 2634 | |
fa96cb38 PA |
2635 | /* Always use -1 and WNOHANG, due to couple of a kernel/ptrace |
2636 | quirks: | |
0d62e5e8 | 2637 | |
fa96cb38 PA |
2638 | - If the thread group leader exits while other threads in the |
2639 | thread group still exist, waitpid(TGID, ...) hangs. That | |
2640 | waitpid won't return an exit status until the other threads | |
2641 | in the group are reaped. | |
611cb4a5 | 2642 | |
fa96cb38 PA |
2643 | - When a non-leader thread execs, that thread just vanishes |
2644 | without reporting an exit (so we'd hang if we waited for it | |
2645 | explicitly in that case). The exec event is reported to | |
94585166 | 2646 | the TGID pid. */ |
fa96cb38 PA |
2647 | errno = 0; |
2648 | ret = my_waitpid (-1, wstatp, options | WNOHANG); | |
d8301ad1 | 2649 | |
c058728c SM |
2650 | threads_debug_printf ("waitpid(-1, ...) returned %d, %s", |
2651 | ret, errno ? safe_strerror (errno) : "ERRNO-OK"); | |
0d62e5e8 | 2652 | |
fa96cb38 | 2653 | if (ret > 0) |
0d62e5e8 | 2654 | { |
c058728c SM |
2655 | threads_debug_printf ("waitpid %ld received %s", |
2656 | (long) ret, status_to_str (*wstatp).c_str ()); | |
89be2091 | 2657 | |
582511be PA |
2658 | /* Filter all events. IOW, leave all events pending. We'll |
2659 | randomly select an event LWP out of all that have events | |
2660 | below. */ | |
d16f3f6c | 2661 | filter_event (ret, *wstatp); |
fa96cb38 PA |
2662 | /* Retry until nothing comes out of waitpid. A single |
2663 | SIGCHLD can indicate more than one child stopped. */ | |
89be2091 DJ |
2664 | continue; |
2665 | } | |
2666 | ||
20ba1ce6 PA |
2667 | /* Now that we've pulled all events out of the kernel, resume |
2668 | LWPs that don't have an interesting event to report. */ | |
2669 | if (stopping_threads == NOT_STOPPING_THREADS) | |
df95181f TBA |
2670 | for_each_thread ([this] (thread_info *thread) |
2671 | { | |
2672 | resume_stopped_resumed_lwps (thread); | |
2673 | }); | |
20ba1ce6 PA |
2674 | |
2675 | /* ... and find an LWP with a status to report to the core, if | |
2676 | any. */ | |
83e1b6c1 SM |
2677 | event_thread = find_thread_in_random ([&] (thread_info *thread) |
2678 | { | |
2679 | return status_pending_p_callback (thread, filter_ptid); | |
2680 | }); | |
2681 | ||
582511be PA |
2682 | if (event_thread != NULL) |
2683 | { | |
2684 | event_child = get_thread_lwp (event_thread); | |
2685 | *wstatp = event_child->status_pending; | |
2686 | event_child->status_pending_p = 0; | |
2687 | event_child->status_pending = 0; | |
2688 | break; | |
2689 | } | |
2690 | ||
fa96cb38 PA |
2691 | /* Check for zombie thread group leaders. Those can't be reaped |
2692 | until all other threads in the thread group are. */ | |
e8a625d1 PA |
2693 | if (check_zombie_leaders ()) |
2694 | goto retry; | |
fa96cb38 | 2695 | |
a1385b7b SM |
2696 | auto not_stopped = [&] (thread_info *thread) |
2697 | { | |
2698 | return not_stopped_callback (thread, wait_ptid); | |
2699 | }; | |
2700 | ||
fa96cb38 PA |
2701 | /* If there are no resumed children left in the set of LWPs we |
2702 | want to wait for, bail. We can't just block in | |
2703 | waitpid/sigsuspend, because lwps might have been left stopped | |
2704 | in trace-stop state, and we'd be stuck forever waiting for | |
2705 | their status to change (which would only happen if we resumed | |
2706 | them). Even if WNOHANG is set, this return code is preferred | |
2707 | over 0 (below), as it is more detailed. */ | |
a1385b7b | 2708 | if (find_thread (not_stopped) == NULL) |
a6dbe5df | 2709 | { |
c058728c SM |
2710 | threads_debug_printf ("exit (no unwaited-for LWP)"); |
2711 | ||
21987b9c | 2712 | gdb_sigmask (SIG_SETMASK, &prev_mask, NULL); |
fa96cb38 | 2713 | return -1; |
a6dbe5df PA |
2714 | } |
2715 | ||
fa96cb38 PA |
2716 | /* No interesting event to report to the caller. */ |
2717 | if ((options & WNOHANG)) | |
24a09b5f | 2718 | { |
c058728c | 2719 | threads_debug_printf ("WNOHANG set, no event found"); |
fa96cb38 | 2720 | |
21987b9c | 2721 | gdb_sigmask (SIG_SETMASK, &prev_mask, NULL); |
fa96cb38 | 2722 | return 0; |
24a09b5f DJ |
2723 | } |
2724 | ||
fa96cb38 | 2725 | /* Block until we get an event reported with SIGCHLD. */ |
c058728c | 2726 | threads_debug_printf ("sigsuspend'ing"); |
d50171e4 | 2727 | |
fa96cb38 | 2728 | sigsuspend (&prev_mask); |
21987b9c | 2729 | gdb_sigmask (SIG_SETMASK, &prev_mask, NULL); |
fa96cb38 PA |
2730 | goto retry; |
2731 | } | |
d50171e4 | 2732 | |
21987b9c | 2733 | gdb_sigmask (SIG_SETMASK, &prev_mask, NULL); |
d50171e4 | 2734 | |
24583e45 | 2735 | switch_to_thread (event_thread); |
d50171e4 | 2736 | |
fa96cb38 PA |
2737 | return lwpid_of (event_thread); |
2738 | } | |
2739 | ||
d16f3f6c TBA |
2740 | int |
2741 | linux_process_target::wait_for_event (ptid_t ptid, int *wstatp, int options) | |
fa96cb38 | 2742 | { |
d16f3f6c | 2743 | return wait_for_event_filtered (ptid, ptid, wstatp, options); |
611cb4a5 DJ |
2744 | } |
2745 | ||
6bf5e0ba PA |
2746 | /* Select one LWP out of those that have events pending. */ |
2747 | ||
2748 | static void | |
2749 | select_event_lwp (struct lwp_info **orig_lp) | |
2750 | { | |
582511be PA |
2751 | struct thread_info *event_thread = NULL; |
2752 | ||
2753 | /* In all-stop, give preference to the LWP that is being | |
2754 | single-stepped. There will be at most one, and it's the LWP that | |
2755 | the core is most interested in. If we didn't do this, then we'd | |
2756 | have to handle pending step SIGTRAPs somehow in case the core | |
2757 | later continues the previously-stepped thread, otherwise we'd | |
2758 | report the pending SIGTRAP, and the core, not having stepped the | |
2759 | thread, wouldn't understand what the trap was for, and therefore | |
2760 | would report it to the user as a random signal. */ | |
2761 | if (!non_stop) | |
6bf5e0ba | 2762 | { |
39a64da5 SM |
2763 | event_thread = find_thread ([] (thread_info *thread) |
2764 | { | |
2765 | lwp_info *lp = get_thread_lwp (thread); | |
2766 | ||
183be222 | 2767 | return (thread->last_status.kind () == TARGET_WAITKIND_IGNORE |
39a64da5 SM |
2768 | && thread->last_resume_kind == resume_step |
2769 | && lp->status_pending_p); | |
2770 | }); | |
2771 | ||
582511be | 2772 | if (event_thread != NULL) |
c058728c SM |
2773 | threads_debug_printf |
2774 | ("Select single-step %s", | |
2775 | target_pid_to_str (ptid_of (event_thread)).c_str ()); | |
6bf5e0ba | 2776 | } |
582511be | 2777 | if (event_thread == NULL) |
6bf5e0ba PA |
2778 | { |
2779 | /* No single-stepping LWP. Select one at random, out of those | |
dda83cd7 | 2780 | which have had events. */ |
6bf5e0ba | 2781 | |
b0319eaa | 2782 | event_thread = find_thread_in_random ([&] (thread_info *thread) |
39a64da5 SM |
2783 | { |
2784 | lwp_info *lp = get_thread_lwp (thread); | |
2785 | ||
b0319eaa | 2786 | /* Only resumed LWPs that have an event pending. */ |
183be222 | 2787 | return (thread->last_status.kind () == TARGET_WAITKIND_IGNORE |
b0319eaa | 2788 | && lp->status_pending_p); |
39a64da5 | 2789 | }); |
6bf5e0ba PA |
2790 | } |
2791 | ||
d86d4aaf | 2792 | if (event_thread != NULL) |
6bf5e0ba | 2793 | { |
d86d4aaf DE |
2794 | struct lwp_info *event_lp = get_thread_lwp (event_thread); |
2795 | ||
6bf5e0ba PA |
2796 | /* Switch the event LWP. */ |
2797 | *orig_lp = event_lp; | |
2798 | } | |
2799 | } | |
2800 | ||
7984d532 PA |
2801 | /* Decrement the suspend count of all LWPs, except EXCEPT, if non |
2802 | NULL. */ | |
2803 | ||
2804 | static void | |
2805 | unsuspend_all_lwps (struct lwp_info *except) | |
2806 | { | |
139720c5 SM |
2807 | for_each_thread ([&] (thread_info *thread) |
2808 | { | |
2809 | lwp_info *lwp = get_thread_lwp (thread); | |
2810 | ||
2811 | if (lwp != except) | |
2812 | lwp_suspended_decr (lwp); | |
2813 | }); | |
7984d532 PA |
2814 | } |
2815 | ||
5a6b0a41 | 2816 | static bool lwp_running (thread_info *thread); |
fa593d66 PA |
2817 | |
2818 | /* Stabilize threads (move out of jump pads). | |
2819 | ||
2820 | If a thread is midway collecting a fast tracepoint, we need to | |
2821 | finish the collection and move it out of the jump pad before | |
2822 | reporting the signal. | |
2823 | ||
2824 | This avoids recursion while collecting (when a signal arrives | |
2825 | midway, and the signal handler itself collects), which would trash | |
2826 | the trace buffer. In case the user set a breakpoint in a signal | |
2827 | handler, this avoids the backtrace showing the jump pad, etc.. | |
2828 | Most importantly, there are certain things we can't do safely if | |
2829 | threads are stopped in a jump pad (or in its callee's). For | |
2830 | example: | |
2831 | ||
2832 | - starting a new trace run. A thread still collecting the | |
2833 | previous run, could trash the trace buffer when resumed. The trace | |
2834 | buffer control structures would have been reset but the thread had | |
2835 | no way to tell. The thread could even midway memcpy'ing to the | |
2836 | buffer, which would mean that when resumed, it would clobber the | |
2837 | trace buffer that had been set for a new run. | |
2838 | ||
2839 | - we can't rewrite/reuse the jump pads for new tracepoints | |
2840 | safely. Say you do tstart while a thread is stopped midway while | |
2841 | collecting. When the thread is later resumed, it finishes the | |
2842 | collection, and returns to the jump pad, to execute the original | |
2843 | instruction that was under the tracepoint jump at the time the | |
2844 | older run had been started. If the jump pad had been rewritten | |
2845 | since for something else in the new run, the thread would now | |
2846 | execute the wrong / random instructions. */ | |
2847 | ||
5c9eb2f2 TBA |
2848 | void |
2849 | linux_process_target::stabilize_threads () | |
fa593d66 | 2850 | { |
13e567af TBA |
2851 | thread_info *thread_stuck = find_thread ([this] (thread_info *thread) |
2852 | { | |
2853 | return stuck_in_jump_pad (thread); | |
2854 | }); | |
fa593d66 | 2855 | |
d86d4aaf | 2856 | if (thread_stuck != NULL) |
fa593d66 | 2857 | { |
c058728c SM |
2858 | threads_debug_printf ("can't stabilize, LWP %ld is stuck in jump pad", |
2859 | lwpid_of (thread_stuck)); | |
fa593d66 PA |
2860 | return; |
2861 | } | |
2862 | ||
24583e45 | 2863 | scoped_restore_current_thread restore_thread; |
fa593d66 PA |
2864 | |
2865 | stabilizing_threads = 1; | |
2866 | ||
2867 | /* Kick 'em all. */ | |
d16f3f6c TBA |
2868 | for_each_thread ([this] (thread_info *thread) |
2869 | { | |
2870 | move_out_of_jump_pad (thread); | |
2871 | }); | |
fa593d66 PA |
2872 | |
2873 | /* Loop until all are stopped out of the jump pads. */ | |
5a6b0a41 | 2874 | while (find_thread (lwp_running) != NULL) |
fa593d66 PA |
2875 | { |
2876 | struct target_waitstatus ourstatus; | |
2877 | struct lwp_info *lwp; | |
fa593d66 PA |
2878 | int wstat; |
2879 | ||
2880 | /* Note that we go through the full wait even loop. While | |
2881 | moving threads out of jump pad, we need to be able to step | |
2882 | over internal breakpoints and such. */ | |
d16f3f6c | 2883 | wait_1 (minus_one_ptid, &ourstatus, 0); |
fa593d66 | 2884 | |
183be222 | 2885 | if (ourstatus.kind () == TARGET_WAITKIND_STOPPED) |
fa593d66 | 2886 | { |
0bfdf32f | 2887 | lwp = get_thread_lwp (current_thread); |
fa593d66 PA |
2888 | |
2889 | /* Lock it. */ | |
863d01bd | 2890 | lwp_suspended_inc (lwp); |
fa593d66 | 2891 | |
183be222 | 2892 | if (ourstatus.sig () != GDB_SIGNAL_0 |
0bfdf32f | 2893 | || current_thread->last_resume_kind == resume_stop) |
fa593d66 | 2894 | { |
183be222 | 2895 | wstat = W_STOPCODE (gdb_signal_to_host (ourstatus.sig ())); |
fa593d66 PA |
2896 | enqueue_one_deferred_signal (lwp, &wstat); |
2897 | } | |
2898 | } | |
2899 | } | |
2900 | ||
fcdad592 | 2901 | unsuspend_all_lwps (NULL); |
fa593d66 PA |
2902 | |
2903 | stabilizing_threads = 0; | |
2904 | ||
b4d51a55 | 2905 | if (debug_threads) |
fa593d66 | 2906 | { |
13e567af TBA |
2907 | thread_stuck = find_thread ([this] (thread_info *thread) |
2908 | { | |
2909 | return stuck_in_jump_pad (thread); | |
2910 | }); | |
fcb056a5 | 2911 | |
d86d4aaf | 2912 | if (thread_stuck != NULL) |
c058728c SM |
2913 | threads_debug_printf |
2914 | ("couldn't stabilize, LWP %ld got stuck in jump pad", | |
2915 | lwpid_of (thread_stuck)); | |
fa593d66 PA |
2916 | } |
2917 | } | |
2918 | ||
582511be PA |
2919 | /* Convenience function that is called when the kernel reports an |
2920 | event that is not passed out to GDB. */ | |
2921 | ||
2922 | static ptid_t | |
2923 | ignore_event (struct target_waitstatus *ourstatus) | |
2924 | { | |
2925 | /* If we got an event, there may still be others, as a single | |
2926 | SIGCHLD can indicate more than one child stopped. This forces | |
2927 | another target_wait call. */ | |
2928 | async_file_mark (); | |
2929 | ||
183be222 | 2930 | ourstatus->set_ignore (); |
582511be PA |
2931 | return null_ptid; |
2932 | } | |
2933 | ||
fd000fb3 TBA |
2934 | ptid_t |
2935 | linux_process_target::filter_exit_event (lwp_info *event_child, | |
2936 | target_waitstatus *ourstatus) | |
65706a29 PA |
2937 | { |
2938 | struct thread_info *thread = get_lwp_thread (event_child); | |
2939 | ptid_t ptid = ptid_of (thread); | |
2940 | ||
e8a625d1 PA |
2941 | if (ourstatus->kind () == TARGET_WAITKIND_THREAD_EXITED) |
2942 | { | |
2943 | /* We're reporting a thread exit for the leader. The exit was | |
2944 | detected by check_zombie_leaders. */ | |
2945 | gdb_assert (is_leader (thread)); | |
2946 | gdb_assert (report_exit_events_for (thread)); | |
2947 | ||
2948 | delete_lwp (event_child); | |
2949 | return ptid; | |
2950 | } | |
2951 | ||
48989498 PA |
2952 | /* Note we must filter TARGET_WAITKIND_SIGNALLED as well, otherwise |
2953 | if a non-leader thread exits with a signal, we'd report it to the | |
2954 | core which would interpret it as the whole-process exiting. | |
2955 | There is no TARGET_WAITKIND_THREAD_SIGNALLED event kind. */ | |
2956 | if (ourstatus->kind () != TARGET_WAITKIND_EXITED | |
2957 | && ourstatus->kind () != TARGET_WAITKIND_SIGNALLED) | |
2958 | return ptid; | |
2959 | ||
8a841a35 | 2960 | if (!is_leader (thread)) |
65706a29 | 2961 | { |
48989498 | 2962 | if (report_exit_events_for (thread)) |
183be222 | 2963 | ourstatus->set_thread_exited (0); |
65706a29 | 2964 | else |
183be222 | 2965 | ourstatus->set_ignore (); |
65706a29 PA |
2966 | |
2967 | delete_lwp (event_child); | |
2968 | } | |
2969 | return ptid; | |
2970 | } | |
2971 | ||
82075af2 JS |
2972 | /* Returns 1 if GDB is interested in any event_child syscalls. */ |
2973 | ||
2974 | static int | |
2975 | gdb_catching_syscalls_p (struct lwp_info *event_child) | |
2976 | { | |
2977 | struct thread_info *thread = get_lwp_thread (event_child); | |
2978 | struct process_info *proc = get_thread_process (thread); | |
2979 | ||
f27866ba | 2980 | return !proc->syscalls_to_catch.empty (); |
82075af2 JS |
2981 | } |
2982 | ||
9eedd27d TBA |
2983 | bool |
2984 | linux_process_target::gdb_catch_this_syscall (lwp_info *event_child) | |
82075af2 | 2985 | { |
4cc32bec | 2986 | int sysno; |
82075af2 JS |
2987 | struct thread_info *thread = get_lwp_thread (event_child); |
2988 | struct process_info *proc = get_thread_process (thread); | |
2989 | ||
f27866ba | 2990 | if (proc->syscalls_to_catch.empty ()) |
9eedd27d | 2991 | return false; |
82075af2 | 2992 | |
f27866ba | 2993 | if (proc->syscalls_to_catch[0] == ANY_SYSCALL) |
9eedd27d | 2994 | return true; |
82075af2 | 2995 | |
4cc32bec | 2996 | get_syscall_trapinfo (event_child, &sysno); |
f27866ba SM |
2997 | |
2998 | for (int iter : proc->syscalls_to_catch) | |
82075af2 | 2999 | if (iter == sysno) |
9eedd27d | 3000 | return true; |
82075af2 | 3001 | |
9eedd27d | 3002 | return false; |
82075af2 JS |
3003 | } |
3004 | ||
d16f3f6c TBA |
3005 | ptid_t |
3006 | linux_process_target::wait_1 (ptid_t ptid, target_waitstatus *ourstatus, | |
b60cea74 | 3007 | target_wait_flags target_options) |
da6d8c04 | 3008 | { |
c058728c SM |
3009 | THREADS_SCOPED_DEBUG_ENTER_EXIT; |
3010 | ||
c12a5089 | 3011 | client_state &cs = get_client_state (); |
e5f1222d | 3012 | int w; |
fc7238bb | 3013 | struct lwp_info *event_child; |
bd99dc85 | 3014 | int options; |
bd99dc85 | 3015 | int pid; |
6bf5e0ba PA |
3016 | int step_over_finished; |
3017 | int bp_explains_trap; | |
3018 | int maybe_internal_trap; | |
3019 | int report_to_gdb; | |
219f2f23 | 3020 | int trace_event; |
c2d6af84 | 3021 | int in_step_range; |
bd99dc85 | 3022 | |
c058728c | 3023 | threads_debug_printf ("[%s]", target_pid_to_str (ptid).c_str ()); |
87ce2a04 | 3024 | |
bd99dc85 PA |
3025 | /* Translate generic target options into linux options. */ |
3026 | options = __WALL; | |
3027 | if (target_options & TARGET_WNOHANG) | |
3028 | options |= WNOHANG; | |
0d62e5e8 | 3029 | |
fa593d66 PA |
3030 | bp_explains_trap = 0; |
3031 | trace_event = 0; | |
c2d6af84 | 3032 | in_step_range = 0; |
183be222 | 3033 | ourstatus->set_ignore (); |
bd99dc85 | 3034 | |
ef980d65 | 3035 | bool was_any_resumed = any_resumed (); |
f2faf941 | 3036 | |
d7e15655 | 3037 | if (step_over_bkpt == null_ptid) |
d16f3f6c | 3038 | pid = wait_for_event (ptid, &w, options); |
6bf5e0ba PA |
3039 | else |
3040 | { | |
c058728c SM |
3041 | threads_debug_printf ("step_over_bkpt set [%s], doing a blocking wait", |
3042 | target_pid_to_str (step_over_bkpt).c_str ()); | |
d16f3f6c | 3043 | pid = wait_for_event (step_over_bkpt, &w, options & ~WNOHANG); |
6bf5e0ba PA |
3044 | } |
3045 | ||
ef980d65 | 3046 | if (pid == 0 || (pid == -1 && !was_any_resumed)) |
87ce2a04 | 3047 | { |
fa96cb38 PA |
3048 | gdb_assert (target_options & TARGET_WNOHANG); |
3049 | ||
c058728c | 3050 | threads_debug_printf ("ret = null_ptid, TARGET_WAITKIND_IGNORE"); |
fa96cb38 | 3051 | |
183be222 | 3052 | ourstatus->set_ignore (); |
87ce2a04 DE |
3053 | return null_ptid; |
3054 | } | |
fa96cb38 PA |
3055 | else if (pid == -1) |
3056 | { | |
c058728c | 3057 | threads_debug_printf ("ret = null_ptid, TARGET_WAITKIND_NO_RESUMED"); |
bd99dc85 | 3058 | |
183be222 | 3059 | ourstatus->set_no_resumed (); |
fa96cb38 PA |
3060 | return null_ptid; |
3061 | } | |
0d62e5e8 | 3062 | |
0bfdf32f | 3063 | event_child = get_thread_lwp (current_thread); |
0d62e5e8 | 3064 | |
d16f3f6c | 3065 | /* wait_for_event only returns an exit status for the last |
fa96cb38 PA |
3066 | child of a process. Report it. */ |
3067 | if (WIFEXITED (w) || WIFSIGNALED (w)) | |
da6d8c04 | 3068 | { |
fa96cb38 | 3069 | if (WIFEXITED (w)) |
0d62e5e8 | 3070 | { |
e8a625d1 PA |
3071 | /* If we already have the exit recorded in waitstatus, use |
3072 | it. This will happen when we detect a zombie leader, | |
3073 | when we had GDB_THREAD_OPTION_EXIT enabled for it. We | |
3074 | want to report its exit as TARGET_WAITKIND_THREAD_EXITED, | |
3075 | as the whole process hasn't exited yet. */ | |
3076 | const target_waitstatus &ws = event_child->waitstatus; | |
3077 | if (ws.kind () != TARGET_WAITKIND_IGNORE) | |
3078 | { | |
3079 | gdb_assert (ws.kind () == TARGET_WAITKIND_EXITED | |
3080 | || ws.kind () == TARGET_WAITKIND_THREAD_EXITED); | |
3081 | *ourstatus = ws; | |
3082 | } | |
3083 | else | |
3084 | ourstatus->set_exited (WEXITSTATUS (w)); | |
bd99dc85 | 3085 | |
c058728c SM |
3086 | threads_debug_printf |
3087 | ("ret = %s, exited with retcode %d", | |
3088 | target_pid_to_str (ptid_of (current_thread)).c_str (), | |
3089 | WEXITSTATUS (w)); | |
fa96cb38 PA |
3090 | } |
3091 | else | |
3092 | { | |
183be222 | 3093 | ourstatus->set_signalled (gdb_signal_from_host (WTERMSIG (w))); |
5b1c542e | 3094 | |
c058728c SM |
3095 | threads_debug_printf |
3096 | ("ret = %s, terminated with signal %d", | |
3097 | target_pid_to_str (ptid_of (current_thread)).c_str (), | |
3098 | WTERMSIG (w)); | |
0d62e5e8 | 3099 | } |
fa96cb38 | 3100 | |
48989498 | 3101 | return filter_exit_event (event_child, ourstatus); |
da6d8c04 DJ |
3102 | } |
3103 | ||
2d97cd35 AT |
3104 | /* If step-over executes a breakpoint instruction, in the case of a |
3105 | hardware single step it means a gdb/gdbserver breakpoint had been | |
3106 | planted on top of a permanent breakpoint, in the case of a software | |
3107 | single step it may just mean that gdbserver hit the reinsert breakpoint. | |
e7ad2f14 | 3108 | The PC has been adjusted by save_stop_reason to point at |
2d97cd35 AT |
3109 | the breakpoint address. |
3110 | So in the case of the hardware single step advance the PC manually | |
3111 | past the breakpoint and in the case of software single step advance only | |
3b9a79ef | 3112 | if it's not the single_step_breakpoint we are hitting. |
2d97cd35 AT |
3113 | This avoids that a program would keep trapping a permanent breakpoint |
3114 | forever. */ | |
d7e15655 | 3115 | if (step_over_bkpt != null_ptid |
2d97cd35 AT |
3116 | && event_child->stop_reason == TARGET_STOPPED_BY_SW_BREAKPOINT |
3117 | && (event_child->stepping | |
3b9a79ef | 3118 | || !single_step_breakpoint_inserted_here (event_child->stop_pc))) |
8090aef2 | 3119 | { |
dd373349 AT |
3120 | int increment_pc = 0; |
3121 | int breakpoint_kind = 0; | |
3122 | CORE_ADDR stop_pc = event_child->stop_pc; | |
3123 | ||
d16f3f6c TBA |
3124 | breakpoint_kind = breakpoint_kind_from_current_state (&stop_pc); |
3125 | sw_breakpoint_from_kind (breakpoint_kind, &increment_pc); | |
8090aef2 | 3126 | |
c058728c SM |
3127 | threads_debug_printf |
3128 | ("step-over for %s executed software breakpoint", | |
3129 | target_pid_to_str (ptid_of (current_thread)).c_str ()); | |
8090aef2 PA |
3130 | |
3131 | if (increment_pc != 0) | |
3132 | { | |
3133 | struct regcache *regcache | |
3134 | = get_thread_regcache (current_thread, 1); | |
3135 | ||
3136 | event_child->stop_pc += increment_pc; | |
bf9ae9d8 | 3137 | low_set_pc (regcache, event_child->stop_pc); |
8090aef2 | 3138 | |
d7146cda | 3139 | if (!low_breakpoint_at (event_child->stop_pc)) |
15c66dd6 | 3140 | event_child->stop_reason = TARGET_STOPPED_BY_NO_REASON; |
8090aef2 PA |
3141 | } |
3142 | } | |
3143 | ||
6bf5e0ba PA |
3144 | /* If this event was not handled before, and is not a SIGTRAP, we |
3145 | report it. SIGILL and SIGSEGV are also treated as traps in case | |
3146 | a breakpoint is inserted at the current PC. If this target does | |
3147 | not support internal breakpoints at all, we also report the | |
3148 | SIGTRAP without further processing; it's of no concern to us. */ | |
3149 | maybe_internal_trap | |
bf9ae9d8 | 3150 | = (low_supports_breakpoints () |
6bf5e0ba PA |
3151 | && (WSTOPSIG (w) == SIGTRAP |
3152 | || ((WSTOPSIG (w) == SIGILL | |
3153 | || WSTOPSIG (w) == SIGSEGV) | |
d7146cda | 3154 | && low_breakpoint_at (event_child->stop_pc)))); |
6bf5e0ba PA |
3155 | |
3156 | if (maybe_internal_trap) | |
3157 | { | |
3158 | /* Handle anything that requires bookkeeping before deciding to | |
3159 | report the event or continue waiting. */ | |
3160 | ||
3161 | /* First check if we can explain the SIGTRAP with an internal | |
3162 | breakpoint, or if we should possibly report the event to GDB. | |
3163 | Do this before anything that may remove or insert a | |
3164 | breakpoint. */ | |
3165 | bp_explains_trap = breakpoint_inserted_here (event_child->stop_pc); | |
3166 | ||
3167 | /* We have a SIGTRAP, possibly a step-over dance has just | |
3168 | finished. If so, tweak the state machine accordingly, | |
3b9a79ef YQ |
3169 | reinsert breakpoints and delete any single-step |
3170 | breakpoints. */ | |
6bf5e0ba PA |
3171 | step_over_finished = finish_step_over (event_child); |
3172 | ||
3173 | /* Now invoke the callbacks of any internal breakpoints there. */ | |
3174 | check_breakpoints (event_child->stop_pc); | |
3175 | ||
219f2f23 PA |
3176 | /* Handle tracepoint data collecting. This may overflow the |
3177 | trace buffer, and cause a tracing stop, removing | |
3178 | breakpoints. */ | |
3179 | trace_event = handle_tracepoints (event_child); | |
3180 | ||
6bf5e0ba | 3181 | if (bp_explains_trap) |
c058728c | 3182 | threads_debug_printf ("Hit a gdbserver breakpoint."); |
6bf5e0ba PA |
3183 | } |
3184 | else | |
3185 | { | |
3186 | /* We have some other signal, possibly a step-over dance was in | |
3187 | progress, and it should be cancelled too. */ | |
3188 | step_over_finished = finish_step_over (event_child); | |
fa593d66 PA |
3189 | } |
3190 | ||
3191 | /* We have all the data we need. Either report the event to GDB, or | |
3192 | resume threads and keep waiting for more. */ | |
3193 | ||
3194 | /* If we're collecting a fast tracepoint, finish the collection and | |
3195 | move out of the jump pad before delivering a signal. See | |
3196 | linux_stabilize_threads. */ | |
3197 | ||
3198 | if (WIFSTOPPED (w) | |
3199 | && WSTOPSIG (w) != SIGTRAP | |
3200 | && supports_fast_tracepoints () | |
58b4daa5 | 3201 | && agent_loaded_p ()) |
fa593d66 | 3202 | { |
c058728c SM |
3203 | threads_debug_printf ("Got signal %d for LWP %ld. Check if we need " |
3204 | "to defer or adjust it.", | |
3205 | WSTOPSIG (w), lwpid_of (current_thread)); | |
fa593d66 PA |
3206 | |
3207 | /* Allow debugging the jump pad itself. */ | |
0bfdf32f | 3208 | if (current_thread->last_resume_kind != resume_step |
fa593d66 PA |
3209 | && maybe_move_out_of_jump_pad (event_child, &w)) |
3210 | { | |
3211 | enqueue_one_deferred_signal (event_child, &w); | |
3212 | ||
c058728c SM |
3213 | threads_debug_printf ("Signal %d for LWP %ld deferred (in jump pad)", |
3214 | WSTOPSIG (w), lwpid_of (current_thread)); | |
fa593d66 | 3215 | |
df95181f | 3216 | resume_one_lwp (event_child, 0, 0, NULL); |
582511be PA |
3217 | |
3218 | return ignore_event (ourstatus); | |
fa593d66 PA |
3219 | } |
3220 | } | |
219f2f23 | 3221 | |
229d26fc SM |
3222 | if (event_child->collecting_fast_tracepoint |
3223 | != fast_tpoint_collect_result::not_collecting) | |
fa593d66 | 3224 | { |
c058728c SM |
3225 | threads_debug_printf |
3226 | ("LWP %ld was trying to move out of the jump pad (%d). " | |
3227 | "Check if we're already there.", | |
3228 | lwpid_of (current_thread), | |
3229 | (int) event_child->collecting_fast_tracepoint); | |
fa593d66 PA |
3230 | |
3231 | trace_event = 1; | |
3232 | ||
3233 | event_child->collecting_fast_tracepoint | |
3234 | = linux_fast_tracepoint_collecting (event_child, NULL); | |
3235 | ||
229d26fc SM |
3236 | if (event_child->collecting_fast_tracepoint |
3237 | != fast_tpoint_collect_result::before_insn) | |
fa593d66 PA |
3238 | { |
3239 | /* No longer need this breakpoint. */ | |
3240 | if (event_child->exit_jump_pad_bkpt != NULL) | |
3241 | { | |
c058728c SM |
3242 | threads_debug_printf |
3243 | ("No longer need exit-jump-pad bkpt; removing it." | |
3244 | "stopping all threads momentarily."); | |
fa593d66 PA |
3245 | |
3246 | /* Other running threads could hit this breakpoint. | |
3247 | We don't handle moribund locations like GDB does, | |
3248 | instead we always pause all threads when removing | |
3249 | breakpoints, so that any step-over or | |
3250 | decr_pc_after_break adjustment is always taken | |
3251 | care of while the breakpoint is still | |
3252 | inserted. */ | |
3253 | stop_all_lwps (1, event_child); | |
fa593d66 PA |
3254 | |
3255 | delete_breakpoint (event_child->exit_jump_pad_bkpt); | |
3256 | event_child->exit_jump_pad_bkpt = NULL; | |
3257 | ||
3258 | unstop_all_lwps (1, event_child); | |
3259 | ||
3260 | gdb_assert (event_child->suspended >= 0); | |
3261 | } | |
3262 | } | |
3263 | ||
229d26fc SM |
3264 | if (event_child->collecting_fast_tracepoint |
3265 | == fast_tpoint_collect_result::not_collecting) | |
fa593d66 | 3266 | { |
c058728c SM |
3267 | threads_debug_printf |
3268 | ("fast tracepoint finished collecting successfully."); | |
fa593d66 PA |
3269 | |
3270 | /* We may have a deferred signal to report. */ | |
3271 | if (dequeue_one_deferred_signal (event_child, &w)) | |
c058728c | 3272 | threads_debug_printf ("dequeued one signal."); |
3c11dd79 | 3273 | else |
fa593d66 | 3274 | { |
c058728c | 3275 | threads_debug_printf ("no deferred signals."); |
fa593d66 PA |
3276 | |
3277 | if (stabilizing_threads) | |
3278 | { | |
183be222 | 3279 | ourstatus->set_stopped (GDB_SIGNAL_0); |
87ce2a04 | 3280 | |
c058728c SM |
3281 | threads_debug_printf |
3282 | ("ret = %s, stopped while stabilizing threads", | |
3283 | target_pid_to_str (ptid_of (current_thread)).c_str ()); | |
87ce2a04 | 3284 | |
0bfdf32f | 3285 | return ptid_of (current_thread); |
fa593d66 PA |
3286 | } |
3287 | } | |
3288 | } | |
6bf5e0ba PA |
3289 | } |
3290 | ||
e471f25b PA |
3291 | /* Check whether GDB would be interested in this event. */ |
3292 | ||
82075af2 JS |
3293 | /* Check if GDB is interested in this syscall. */ |
3294 | if (WIFSTOPPED (w) | |
3295 | && WSTOPSIG (w) == SYSCALL_SIGTRAP | |
9eedd27d | 3296 | && !gdb_catch_this_syscall (event_child)) |
82075af2 | 3297 | { |
c058728c SM |
3298 | threads_debug_printf ("Ignored syscall for LWP %ld.", |
3299 | lwpid_of (current_thread)); | |
82075af2 | 3300 | |
df95181f | 3301 | resume_one_lwp (event_child, event_child->stepping, 0, NULL); |
edeeb602 | 3302 | |
82075af2 JS |
3303 | return ignore_event (ourstatus); |
3304 | } | |
3305 | ||
e471f25b PA |
3306 | /* If GDB is not interested in this signal, don't stop other |
3307 | threads, and don't report it to GDB. Just resume the inferior | |
3308 | right away. We do this for threading-related signals as well as | |
3309 | any that GDB specifically requested we ignore. But never ignore | |
3310 | SIGSTOP if we sent it ourselves, and do not ignore signals when | |
3311 | stepping - they may require special handling to skip the signal | |
c9587f88 AT |
3312 | handler. Also never ignore signals that could be caused by a |
3313 | breakpoint. */ | |
e471f25b | 3314 | if (WIFSTOPPED (w) |
0bfdf32f | 3315 | && current_thread->last_resume_kind != resume_step |
e471f25b | 3316 | && ( |
1a981360 | 3317 | #if defined (USE_THREAD_DB) && !defined (__ANDROID__) |
fe978cb0 | 3318 | (current_process ()->priv->thread_db != NULL |
e471f25b PA |
3319 | && (WSTOPSIG (w) == __SIGRTMIN |
3320 | || WSTOPSIG (w) == __SIGRTMIN + 1)) | |
3321 | || | |
3322 | #endif | |
c12a5089 | 3323 | (cs.pass_signals[gdb_signal_from_host (WSTOPSIG (w))] |
e471f25b | 3324 | && !(WSTOPSIG (w) == SIGSTOP |
c9587f88 AT |
3325 | && current_thread->last_resume_kind == resume_stop) |
3326 | && !linux_wstatus_maybe_breakpoint (w)))) | |
e471f25b PA |
3327 | { |
3328 | siginfo_t info, *info_p; | |
3329 | ||
c058728c SM |
3330 | threads_debug_printf ("Ignored signal %d for LWP %ld.", |
3331 | WSTOPSIG (w), lwpid_of (current_thread)); | |
e471f25b | 3332 | |
0bfdf32f | 3333 | if (ptrace (PTRACE_GETSIGINFO, lwpid_of (current_thread), |
b8e1b30e | 3334 | (PTRACE_TYPE_ARG3) 0, &info) == 0) |
e471f25b PA |
3335 | info_p = &info; |
3336 | else | |
3337 | info_p = NULL; | |
863d01bd PA |
3338 | |
3339 | if (step_over_finished) | |
3340 | { | |
3341 | /* We cancelled this thread's step-over above. We still | |
3342 | need to unsuspend all other LWPs, and set them back | |
3343 | running again while the signal handler runs. */ | |
3344 | unsuspend_all_lwps (event_child); | |
3345 | ||
3346 | /* Enqueue the pending signal info so that proceed_all_lwps | |
3347 | doesn't lose it. */ | |
3348 | enqueue_pending_signal (event_child, WSTOPSIG (w), info_p); | |
3349 | ||
3350 | proceed_all_lwps (); | |
3351 | } | |
3352 | else | |
3353 | { | |
df95181f TBA |
3354 | resume_one_lwp (event_child, event_child->stepping, |
3355 | WSTOPSIG (w), info_p); | |
863d01bd | 3356 | } |
edeeb602 | 3357 | |
582511be | 3358 | return ignore_event (ourstatus); |
e471f25b PA |
3359 | } |
3360 | ||
c2d6af84 PA |
3361 | /* Note that all addresses are always "out of the step range" when |
3362 | there's no range to begin with. */ | |
3363 | in_step_range = lwp_in_step_range (event_child); | |
3364 | ||
3365 | /* If GDB wanted this thread to single step, and the thread is out | |
3366 | of the step range, we always want to report the SIGTRAP, and let | |
3367 | GDB handle it. Watchpoints should always be reported. So should | |
3368 | signals we can't explain. A SIGTRAP we can't explain could be a | |
3369 | GDB breakpoint --- we may or not support Z0 breakpoints. If we | |
3370 | do, we're be able to handle GDB breakpoints on top of internal | |
3371 | breakpoints, by handling the internal breakpoint and still | |
3372 | reporting the event to GDB. If we don't, we're out of luck, GDB | |
863d01bd PA |
3373 | won't see the breakpoint hit. If we see a single-step event but |
3374 | the thread should be continuing, don't pass the trap to gdb. | |
3375 | That indicates that we had previously finished a single-step but | |
3376 | left the single-step pending -- see | |
3377 | complete_ongoing_step_over. */ | |
6bf5e0ba | 3378 | report_to_gdb = (!maybe_internal_trap |
0bfdf32f | 3379 | || (current_thread->last_resume_kind == resume_step |
c2d6af84 | 3380 | && !in_step_range) |
15c66dd6 | 3381 | || event_child->stop_reason == TARGET_STOPPED_BY_WATCHPOINT |
863d01bd PA |
3382 | || (!in_step_range |
3383 | && !bp_explains_trap | |
3384 | && !trace_event | |
3385 | && !step_over_finished | |
3386 | && !(current_thread->last_resume_kind == resume_continue | |
3387 | && event_child->stop_reason == TARGET_STOPPED_BY_SINGLE_STEP)) | |
9f3a5c85 | 3388 | || (gdb_breakpoint_here (event_child->stop_pc) |
d3ce09f5 | 3389 | && gdb_condition_true_at_breakpoint (event_child->stop_pc) |
de0d863e | 3390 | && gdb_no_commands_at_breakpoint (event_child->stop_pc)) |
183be222 | 3391 | || event_child->waitstatus.kind () != TARGET_WAITKIND_IGNORE); |
d3ce09f5 SS |
3392 | |
3393 | run_breakpoint_commands (event_child->stop_pc); | |
6bf5e0ba PA |
3394 | |
3395 | /* We found no reason GDB would want us to stop. We either hit one | |
3396 | of our own breakpoints, or finished an internal step GDB | |
3397 | shouldn't know about. */ | |
3398 | if (!report_to_gdb) | |
3399 | { | |
c058728c SM |
3400 | if (bp_explains_trap) |
3401 | threads_debug_printf ("Hit a gdbserver breakpoint."); | |
3402 | ||
3403 | if (step_over_finished) | |
3404 | threads_debug_printf ("Step-over finished."); | |
3405 | ||
3406 | if (trace_event) | |
3407 | threads_debug_printf ("Tracepoint event."); | |
3408 | ||
3409 | if (lwp_in_step_range (event_child)) | |
3410 | threads_debug_printf ("Range stepping pc 0x%s [0x%s, 0x%s).", | |
3411 | paddress (event_child->stop_pc), | |
3412 | paddress (event_child->step_range_start), | |
3413 | paddress (event_child->step_range_end)); | |
6bf5e0ba PA |
3414 | |
3415 | /* We're not reporting this breakpoint to GDB, so apply the | |
3416 | decr_pc_after_break adjustment to the inferior's regcache | |
3417 | ourselves. */ | |
3418 | ||
bf9ae9d8 | 3419 | if (low_supports_breakpoints ()) |
6bf5e0ba PA |
3420 | { |
3421 | struct regcache *regcache | |
0bfdf32f | 3422 | = get_thread_regcache (current_thread, 1); |
bf9ae9d8 | 3423 | low_set_pc (regcache, event_child->stop_pc); |
6bf5e0ba PA |
3424 | } |
3425 | ||
7984d532 | 3426 | if (step_over_finished) |
e3652c84 YQ |
3427 | { |
3428 | /* If we have finished stepping over a breakpoint, we've | |
3429 | stopped and suspended all LWPs momentarily except the | |
3430 | stepping one. This is where we resume them all again. | |
3431 | We're going to keep waiting, so use proceed, which | |
3432 | handles stepping over the next breakpoint. */ | |
3433 | unsuspend_all_lwps (event_child); | |
3434 | } | |
3435 | else | |
3436 | { | |
3437 | /* Remove the single-step breakpoints if any. Note that | |
3438 | there isn't single-step breakpoint if we finished stepping | |
3439 | over. */ | |
7582c77c | 3440 | if (supports_software_single_step () |
e3652c84 YQ |
3441 | && has_single_step_breakpoints (current_thread)) |
3442 | { | |
3443 | stop_all_lwps (0, event_child); | |
3444 | delete_single_step_breakpoints (current_thread); | |
3445 | unstop_all_lwps (0, event_child); | |
3446 | } | |
3447 | } | |
7984d532 | 3448 | |
c058728c | 3449 | threads_debug_printf ("proceeding all threads."); |
edeeb602 | 3450 | |
c058728c | 3451 | proceed_all_lwps (); |
edeeb602 | 3452 | |
582511be | 3453 | return ignore_event (ourstatus); |
6bf5e0ba PA |
3454 | } |
3455 | ||
c058728c SM |
3456 | if (debug_threads) |
3457 | { | |
3458 | if (event_child->waitstatus.kind () != TARGET_WAITKIND_IGNORE) | |
3459 | threads_debug_printf ("LWP %ld: extended event with waitstatus %s", | |
3460 | lwpid_of (get_lwp_thread (event_child)), | |
3461 | event_child->waitstatus.to_string ().c_str ()); | |
3462 | ||
3463 | if (current_thread->last_resume_kind == resume_step) | |
3464 | { | |
3465 | if (event_child->step_range_start == event_child->step_range_end) | |
3466 | threads_debug_printf | |
3467 | ("GDB wanted to single-step, reporting event."); | |
3468 | else if (!lwp_in_step_range (event_child)) | |
3469 | threads_debug_printf ("Out of step range, reporting event."); | |
3470 | } | |
3471 | ||
3472 | if (event_child->stop_reason == TARGET_STOPPED_BY_WATCHPOINT) | |
3473 | threads_debug_printf ("Stopped by watchpoint."); | |
3474 | else if (gdb_breakpoint_here (event_child->stop_pc)) | |
3475 | threads_debug_printf ("Stopped by GDB breakpoint."); | |
3476 | } | |
3477 | ||
3478 | threads_debug_printf ("Hit a non-gdbserver trap event."); | |
6bf5e0ba PA |
3479 | |
3480 | /* Alright, we're going to report a stop. */ | |
3481 | ||
3b9a79ef | 3482 | /* Remove single-step breakpoints. */ |
7582c77c | 3483 | if (supports_software_single_step ()) |
8901d193 | 3484 | { |
3b9a79ef | 3485 | /* Remove single-step breakpoints or not. It it is true, stop all |
8901d193 YQ |
3486 | lwps, so that other threads won't hit the breakpoint in the |
3487 | staled memory. */ | |
3b9a79ef | 3488 | int remove_single_step_breakpoints_p = 0; |
8901d193 YQ |
3489 | |
3490 | if (non_stop) | |
3491 | { | |
3b9a79ef YQ |
3492 | remove_single_step_breakpoints_p |
3493 | = has_single_step_breakpoints (current_thread); | |
8901d193 YQ |
3494 | } |
3495 | else | |
3496 | { | |
3497 | /* In all-stop, a stop reply cancels all previous resume | |
3b9a79ef | 3498 | requests. Delete all single-step breakpoints. */ |
8901d193 | 3499 | |
9c80ecd6 SM |
3500 | find_thread ([&] (thread_info *thread) { |
3501 | if (has_single_step_breakpoints (thread)) | |
3502 | { | |
3503 | remove_single_step_breakpoints_p = 1; | |
3504 | return true; | |
3505 | } | |
8901d193 | 3506 | |
9c80ecd6 SM |
3507 | return false; |
3508 | }); | |
8901d193 YQ |
3509 | } |
3510 | ||
3b9a79ef | 3511 | if (remove_single_step_breakpoints_p) |
8901d193 | 3512 | { |
3b9a79ef | 3513 | /* If we remove single-step breakpoints from memory, stop all lwps, |
8901d193 YQ |
3514 | so that other threads won't hit the breakpoint in the staled |
3515 | memory. */ | |
3516 | stop_all_lwps (0, event_child); | |
3517 | ||
3518 | if (non_stop) | |
3519 | { | |
3b9a79ef YQ |
3520 | gdb_assert (has_single_step_breakpoints (current_thread)); |
3521 | delete_single_step_breakpoints (current_thread); | |
8901d193 YQ |
3522 | } |
3523 | else | |
3524 | { | |
9c80ecd6 SM |
3525 | for_each_thread ([] (thread_info *thread){ |
3526 | if (has_single_step_breakpoints (thread)) | |
3527 | delete_single_step_breakpoints (thread); | |
3528 | }); | |
8901d193 YQ |
3529 | } |
3530 | ||
3531 | unstop_all_lwps (0, event_child); | |
3532 | } | |
3533 | } | |
3534 | ||
582511be | 3535 | if (!stabilizing_threads) |
6bf5e0ba PA |
3536 | { |
3537 | /* In all-stop, stop all threads. */ | |
582511be PA |
3538 | if (!non_stop) |
3539 | stop_all_lwps (0, NULL); | |
6bf5e0ba | 3540 | |
c03e6ccc | 3541 | if (step_over_finished) |
582511be PA |
3542 | { |
3543 | if (!non_stop) | |
3544 | { | |
3545 | /* If we were doing a step-over, all other threads but | |
3546 | the stepping one had been paused in start_step_over, | |
3547 | with their suspend counts incremented. We don't want | |
3548 | to do a full unstop/unpause, because we're in | |
3549 | all-stop mode (so we want threads stopped), but we | |
3550 | still need to unsuspend the other threads, to | |
3551 | decrement their `suspended' count back. */ | |
3552 | unsuspend_all_lwps (event_child); | |
3553 | } | |
3554 | else | |
3555 | { | |
3556 | /* If we just finished a step-over, then all threads had | |
3557 | been momentarily paused. In all-stop, that's fine, | |
3558 | we want threads stopped by now anyway. In non-stop, | |
3559 | we need to re-resume threads that GDB wanted to be | |
3560 | running. */ | |
3561 | unstop_all_lwps (1, event_child); | |
3562 | } | |
3563 | } | |
c03e6ccc | 3564 | |
3aa5cfa0 AT |
3565 | /* If we're not waiting for a specific LWP, choose an event LWP |
3566 | from among those that have had events. Giving equal priority | |
3567 | to all LWPs that have had events helps prevent | |
3568 | starvation. */ | |
d7e15655 | 3569 | if (ptid == minus_one_ptid) |
3aa5cfa0 AT |
3570 | { |
3571 | event_child->status_pending_p = 1; | |
3572 | event_child->status_pending = w; | |
3573 | ||
3574 | select_event_lwp (&event_child); | |
3575 | ||
3576 | /* current_thread and event_child must stay in sync. */ | |
24583e45 | 3577 | switch_to_thread (get_lwp_thread (event_child)); |
3aa5cfa0 AT |
3578 | |
3579 | event_child->status_pending_p = 0; | |
3580 | w = event_child->status_pending; | |
3581 | } | |
3582 | ||
3583 | ||
fa593d66 | 3584 | /* Stabilize threads (move out of jump pads). */ |
582511be | 3585 | if (!non_stop) |
5c9eb2f2 | 3586 | target_stabilize_threads (); |
6bf5e0ba PA |
3587 | } |
3588 | else | |
3589 | { | |
3590 | /* If we just finished a step-over, then all threads had been | |
3591 | momentarily paused. In all-stop, that's fine, we want | |
3592 | threads stopped by now anyway. In non-stop, we need to | |
3593 | re-resume threads that GDB wanted to be running. */ | |
3594 | if (step_over_finished) | |
7984d532 | 3595 | unstop_all_lwps (1, event_child); |
6bf5e0ba PA |
3596 | } |
3597 | ||
e88cf517 SM |
3598 | /* At this point, we haven't set OURSTATUS. This is where we do it. */ |
3599 | gdb_assert (ourstatus->kind () == TARGET_WAITKIND_IGNORE); | |
3600 | ||
183be222 | 3601 | if (event_child->waitstatus.kind () != TARGET_WAITKIND_IGNORE) |
de0d863e | 3602 | { |
393a6b59 PA |
3603 | /* If the reported event is an exit, fork, vfork, clone or exec, |
3604 | let GDB know. */ | |
5a04c4cf | 3605 | |
393a6b59 PA |
3606 | /* Break the unreported fork/vfork/clone relationship chain. */ |
3607 | if (is_new_child_status (event_child->waitstatus.kind ())) | |
5a04c4cf | 3608 | { |
393a6b59 PA |
3609 | event_child->relative->relative = NULL; |
3610 | event_child->relative = NULL; | |
5a04c4cf PA |
3611 | } |
3612 | ||
00db26fa | 3613 | *ourstatus = event_child->waitstatus; |
de0d863e | 3614 | /* Clear the event lwp's waitstatus since we handled it already. */ |
183be222 | 3615 | event_child->waitstatus.set_ignore (); |
de0d863e DB |
3616 | } |
3617 | else | |
183be222 | 3618 | { |
e88cf517 | 3619 | /* The LWP stopped due to a plain signal or a syscall signal. Either way, |
3bfdcabb | 3620 | event_child->waitstatus wasn't filled in with the details, so look at |
e88cf517 SM |
3621 | the wait status W. */ |
3622 | if (WSTOPSIG (w) == SYSCALL_SIGTRAP) | |
3623 | { | |
3624 | int syscall_number; | |
3625 | ||
3626 | get_syscall_trapinfo (event_child, &syscall_number); | |
3627 | if (event_child->syscall_state == TARGET_WAITKIND_SYSCALL_ENTRY) | |
3628 | ourstatus->set_syscall_entry (syscall_number); | |
3629 | else if (event_child->syscall_state == TARGET_WAITKIND_SYSCALL_RETURN) | |
3630 | ourstatus->set_syscall_return (syscall_number); | |
3631 | else | |
3632 | gdb_assert_not_reached ("unexpected syscall state"); | |
3633 | } | |
3634 | else if (current_thread->last_resume_kind == resume_stop | |
3635 | && WSTOPSIG (w) == SIGSTOP) | |
3636 | { | |
3637 | /* A thread that has been requested to stop by GDB with vCont;t, | |
3638 | and it stopped cleanly, so report as SIG0. The use of | |
3639 | SIGSTOP is an implementation detail. */ | |
3640 | ourstatus->set_stopped (GDB_SIGNAL_0); | |
3641 | } | |
3642 | else | |
3643 | ourstatus->set_stopped (gdb_signal_from_host (WSTOPSIG (w))); | |
183be222 | 3644 | } |
5b1c542e | 3645 | |
582511be | 3646 | /* Now that we've selected our final event LWP, un-adjust its PC if |
3e572f71 PA |
3647 | it was a software breakpoint, and the client doesn't know we can |
3648 | adjust the breakpoint ourselves. */ | |
3649 | if (event_child->stop_reason == TARGET_STOPPED_BY_SW_BREAKPOINT | |
c12a5089 | 3650 | && !cs.swbreak_feature) |
582511be | 3651 | { |
d4807ea2 | 3652 | int decr_pc = low_decr_pc_after_break (); |
582511be PA |
3653 | |
3654 | if (decr_pc != 0) | |
3655 | { | |
3656 | struct regcache *regcache | |
3657 | = get_thread_regcache (current_thread, 1); | |
bf9ae9d8 | 3658 | low_set_pc (regcache, event_child->stop_pc + decr_pc); |
582511be PA |
3659 | } |
3660 | } | |
3661 | ||
d7e15655 | 3662 | gdb_assert (step_over_bkpt == null_ptid); |
d50171e4 | 3663 | |
e48359ea | 3664 | threads_debug_printf ("ret = %s, %s", |
c058728c | 3665 | target_pid_to_str (ptid_of (current_thread)).c_str (), |
e48359ea | 3666 | ourstatus->to_string ().c_str ()); |
bd99dc85 | 3667 | |
48989498 | 3668 | return filter_exit_event (event_child, ourstatus); |
bd99dc85 PA |
3669 | } |
3670 | ||
3671 | /* Get rid of any pending event in the pipe. */ | |
3672 | static void | |
3673 | async_file_flush (void) | |
3674 | { | |
cdc8e9b2 | 3675 | linux_event_pipe.flush (); |
bd99dc85 PA |
3676 | } |
3677 | ||
3678 | /* Put something in the pipe, so the event loop wakes up. */ | |
3679 | static void | |
3680 | async_file_mark (void) | |
3681 | { | |
cdc8e9b2 | 3682 | linux_event_pipe.mark (); |
bd99dc85 PA |
3683 | } |
3684 | ||
6532e7e3 TBA |
3685 | ptid_t |
3686 | linux_process_target::wait (ptid_t ptid, | |
3687 | target_waitstatus *ourstatus, | |
b60cea74 | 3688 | target_wait_flags target_options) |
bd99dc85 | 3689 | { |
95954743 | 3690 | ptid_t event_ptid; |
bd99dc85 | 3691 | |
bd99dc85 PA |
3692 | /* Flush the async file first. */ |
3693 | if (target_is_async_p ()) | |
3694 | async_file_flush (); | |
3695 | ||
582511be PA |
3696 | do |
3697 | { | |
d16f3f6c | 3698 | event_ptid = wait_1 (ptid, ourstatus, target_options); |
582511be PA |
3699 | } |
3700 | while ((target_options & TARGET_WNOHANG) == 0 | |
183be222 | 3701 | && ourstatus->kind () == TARGET_WAITKIND_IGNORE); |
bd99dc85 PA |
3702 | |
3703 | /* If at least one stop was reported, there may be more. A single | |
3704 | SIGCHLD can signal more than one child stop. */ | |
3705 | if (target_is_async_p () | |
3706 | && (target_options & TARGET_WNOHANG) != 0 | |
d7e15655 | 3707 | && event_ptid != null_ptid) |
bd99dc85 PA |
3708 | async_file_mark (); |
3709 | ||
3710 | return event_ptid; | |
da6d8c04 DJ |
3711 | } |
3712 | ||
c5f62d5f | 3713 | /* Send a signal to an LWP. */ |
fd500816 DJ |
3714 | |
3715 | static int | |
a1928bad | 3716 | kill_lwp (unsigned long lwpid, int signo) |
fd500816 | 3717 | { |
4a6ed09b | 3718 | int ret; |
fd500816 | 3719 | |
4a6ed09b PA |
3720 | errno = 0; |
3721 | ret = syscall (__NR_tkill, lwpid, signo); | |
3722 | if (errno == ENOSYS) | |
3723 | { | |
3724 | /* If tkill fails, then we are not using nptl threads, a | |
3725 | configuration we no longer support. */ | |
3726 | perror_with_name (("tkill")); | |
3727 | } | |
3728 | return ret; | |
fd500816 DJ |
3729 | } |
3730 | ||
964e4306 PA |
3731 | void |
3732 | linux_stop_lwp (struct lwp_info *lwp) | |
3733 | { | |
3734 | send_sigstop (lwp); | |
3735 | } | |
3736 | ||
0d62e5e8 | 3737 | static void |
02fc4de7 | 3738 | send_sigstop (struct lwp_info *lwp) |
0d62e5e8 | 3739 | { |
bd99dc85 | 3740 | int pid; |
0d62e5e8 | 3741 | |
d86d4aaf | 3742 | pid = lwpid_of (get_lwp_thread (lwp)); |
bd99dc85 | 3743 | |
0d62e5e8 DJ |
3744 | /* If we already have a pending stop signal for this process, don't |
3745 | send another. */ | |
54a0b537 | 3746 | if (lwp->stop_expected) |
0d62e5e8 | 3747 | { |
c058728c | 3748 | threads_debug_printf ("Have pending sigstop for lwp %d", pid); |
ae13219e | 3749 | |
0d62e5e8 DJ |
3750 | return; |
3751 | } | |
3752 | ||
c058728c | 3753 | threads_debug_printf ("Sending sigstop to lwp %d", pid); |
0d62e5e8 | 3754 | |
d50171e4 | 3755 | lwp->stop_expected = 1; |
bd99dc85 | 3756 | kill_lwp (pid, SIGSTOP); |
0d62e5e8 DJ |
3757 | } |
3758 | ||
df3e4dbe SM |
3759 | static void |
3760 | send_sigstop (thread_info *thread, lwp_info *except) | |
02fc4de7 | 3761 | { |
d86d4aaf | 3762 | struct lwp_info *lwp = get_thread_lwp (thread); |
02fc4de7 | 3763 | |
7984d532 PA |
3764 | /* Ignore EXCEPT. */ |
3765 | if (lwp == except) | |
df3e4dbe | 3766 | return; |
7984d532 | 3767 | |
02fc4de7 | 3768 | if (lwp->stopped) |
df3e4dbe | 3769 | return; |
02fc4de7 PA |
3770 | |
3771 | send_sigstop (lwp); | |
7984d532 PA |
3772 | } |
3773 | ||
3774 | /* Increment the suspend count of an LWP, and stop it, if not stopped | |
3775 | yet. */ | |
df3e4dbe SM |
3776 | static void |
3777 | suspend_and_send_sigstop (thread_info *thread, lwp_info *except) | |
7984d532 | 3778 | { |
d86d4aaf | 3779 | struct lwp_info *lwp = get_thread_lwp (thread); |
7984d532 PA |
3780 | |
3781 | /* Ignore EXCEPT. */ | |
3782 | if (lwp == except) | |
df3e4dbe | 3783 | return; |
7984d532 | 3784 | |
863d01bd | 3785 | lwp_suspended_inc (lwp); |
7984d532 | 3786 | |
df3e4dbe | 3787 | send_sigstop (thread, except); |
02fc4de7 PA |
3788 | } |
3789 | ||
e8a625d1 PA |
3790 | /* Mark LWP dead, with WSTAT as exit status pending to report later. |
3791 | If THREAD_EVENT is true, interpret WSTAT as a thread exit event | |
3792 | instead of a process exit event. This is meaningful for the leader | |
3793 | thread, as we normally report a process-wide exit event when we see | |
3794 | the leader exit, and a thread exit event when we see any other | |
3795 | thread exit. */ | |
3796 | ||
95954743 | 3797 | static void |
e8a625d1 | 3798 | mark_lwp_dead (struct lwp_info *lwp, int wstat, bool thread_event) |
95954743 | 3799 | { |
95954743 PA |
3800 | /* Store the exit status for later. */ |
3801 | lwp->status_pending_p = 1; | |
3802 | lwp->status_pending = wstat; | |
3803 | ||
00db26fa PA |
3804 | /* Store in waitstatus as well, as there's nothing else to process |
3805 | for this event. */ | |
3806 | if (WIFEXITED (wstat)) | |
e8a625d1 PA |
3807 | { |
3808 | if (thread_event) | |
3809 | lwp->waitstatus.set_thread_exited (WEXITSTATUS (wstat)); | |
3810 | else | |
3811 | lwp->waitstatus.set_exited (WEXITSTATUS (wstat)); | |
3812 | } | |
00db26fa | 3813 | else if (WIFSIGNALED (wstat)) |
e8a625d1 PA |
3814 | { |
3815 | gdb_assert (!thread_event); | |
3816 | lwp->waitstatus.set_signalled (gdb_signal_from_host (WTERMSIG (wstat))); | |
3817 | } | |
3818 | else | |
3819 | gdb_assert_not_reached ("unknown status kind"); | |
00db26fa | 3820 | |
95954743 PA |
3821 | /* Prevent trying to stop it. */ |
3822 | lwp->stopped = 1; | |
3823 | ||
3824 | /* No further stops are expected from a dead lwp. */ | |
3825 | lwp->stop_expected = 0; | |
3826 | } | |
3827 | ||
00db26fa PA |
3828 | /* Return true if LWP has exited already, and has a pending exit event |
3829 | to report to GDB. */ | |
3830 | ||
3831 | static int | |
3832 | lwp_is_marked_dead (struct lwp_info *lwp) | |
3833 | { | |
3834 | return (lwp->status_pending_p | |
3835 | && (WIFEXITED (lwp->status_pending) | |
3836 | || WIFSIGNALED (lwp->status_pending))); | |
3837 | } | |
3838 | ||
d16f3f6c TBA |
3839 | void |
3840 | linux_process_target::wait_for_sigstop () | |
0d62e5e8 | 3841 | { |
0bfdf32f | 3842 | struct thread_info *saved_thread; |
95954743 | 3843 | ptid_t saved_tid; |
fa96cb38 PA |
3844 | int wstat; |
3845 | int ret; | |
0d62e5e8 | 3846 | |
0bfdf32f GB |
3847 | saved_thread = current_thread; |
3848 | if (saved_thread != NULL) | |
9c80ecd6 | 3849 | saved_tid = saved_thread->id; |
bd99dc85 | 3850 | else |
95954743 | 3851 | saved_tid = null_ptid; /* avoid bogus unused warning */ |
bd99dc85 | 3852 | |
20ac1cdb TBA |
3853 | scoped_restore_current_thread restore_thread; |
3854 | ||
c058728c | 3855 | threads_debug_printf ("pulling events"); |
d50171e4 | 3856 | |
fa96cb38 PA |
3857 | /* Passing NULL_PTID as filter indicates we want all events to be |
3858 | left pending. Eventually this returns when there are no | |
3859 | unwaited-for children left. */ | |
d16f3f6c | 3860 | ret = wait_for_event_filtered (minus_one_ptid, null_ptid, &wstat, __WALL); |
fa96cb38 | 3861 | gdb_assert (ret == -1); |
0d62e5e8 | 3862 | |
13d3d99b | 3863 | if (saved_thread == NULL || mythread_alive (saved_tid)) |
20ac1cdb | 3864 | return; |
0d62e5e8 DJ |
3865 | else |
3866 | { | |
c058728c | 3867 | threads_debug_printf ("Previously current thread died."); |
0d62e5e8 | 3868 | |
f0db101d PA |
3869 | /* We can't change the current inferior behind GDB's back, |
3870 | otherwise, a subsequent command may apply to the wrong | |
3871 | process. */ | |
20ac1cdb TBA |
3872 | restore_thread.dont_restore (); |
3873 | switch_to_thread (nullptr); | |
0d62e5e8 DJ |
3874 | } |
3875 | } | |
3876 | ||
13e567af TBA |
3877 | bool |
3878 | linux_process_target::stuck_in_jump_pad (thread_info *thread) | |
fa593d66 | 3879 | { |
d86d4aaf | 3880 | struct lwp_info *lwp = get_thread_lwp (thread); |
fa593d66 | 3881 | |
863d01bd PA |
3882 | if (lwp->suspended != 0) |
3883 | { | |
f34652de | 3884 | internal_error ("LWP %ld is suspended, suspended=%d\n", |
863d01bd PA |
3885 | lwpid_of (thread), lwp->suspended); |
3886 | } | |
fa593d66 PA |
3887 | gdb_assert (lwp->stopped); |
3888 | ||
3889 | /* Allow debugging the jump pad, gdb_collect, etc.. */ | |
3890 | return (supports_fast_tracepoints () | |
58b4daa5 | 3891 | && agent_loaded_p () |
fa593d66 | 3892 | && (gdb_breakpoint_here (lwp->stop_pc) |
15c66dd6 | 3893 | || lwp->stop_reason == TARGET_STOPPED_BY_WATCHPOINT |
fa593d66 | 3894 | || thread->last_resume_kind == resume_step) |
229d26fc SM |
3895 | && (linux_fast_tracepoint_collecting (lwp, NULL) |
3896 | != fast_tpoint_collect_result::not_collecting)); | |
fa593d66 PA |
3897 | } |
3898 | ||
d16f3f6c TBA |
3899 | void |
3900 | linux_process_target::move_out_of_jump_pad (thread_info *thread) | |
fa593d66 | 3901 | { |
d86d4aaf | 3902 | struct lwp_info *lwp = get_thread_lwp (thread); |
fa593d66 PA |
3903 | int *wstat; |
3904 | ||
863d01bd PA |
3905 | if (lwp->suspended != 0) |
3906 | { | |
f34652de | 3907 | internal_error ("LWP %ld is suspended, suspended=%d\n", |
863d01bd PA |
3908 | lwpid_of (thread), lwp->suspended); |
3909 | } | |
fa593d66 PA |
3910 | gdb_assert (lwp->stopped); |
3911 | ||
f0ce0d3a | 3912 | /* For gdb_breakpoint_here. */ |
24583e45 TBA |
3913 | scoped_restore_current_thread restore_thread; |
3914 | switch_to_thread (thread); | |
f0ce0d3a | 3915 | |
fa593d66 PA |
3916 | wstat = lwp->status_pending_p ? &lwp->status_pending : NULL; |
3917 | ||
3918 | /* Allow debugging the jump pad, gdb_collect, etc. */ | |
3919 | if (!gdb_breakpoint_here (lwp->stop_pc) | |
15c66dd6 | 3920 | && lwp->stop_reason != TARGET_STOPPED_BY_WATCHPOINT |
fa593d66 PA |
3921 | && thread->last_resume_kind != resume_step |
3922 | && maybe_move_out_of_jump_pad (lwp, wstat)) | |
3923 | { | |
c058728c SM |
3924 | threads_debug_printf ("LWP %ld needs stabilizing (in jump pad)", |
3925 | lwpid_of (thread)); | |
fa593d66 PA |
3926 | |
3927 | if (wstat) | |
3928 | { | |
3929 | lwp->status_pending_p = 0; | |
3930 | enqueue_one_deferred_signal (lwp, wstat); | |
3931 | ||
c058728c SM |
3932 | threads_debug_printf ("Signal %d for LWP %ld deferred (in jump pad", |
3933 | WSTOPSIG (*wstat), lwpid_of (thread)); | |
fa593d66 PA |
3934 | } |
3935 | ||
df95181f | 3936 | resume_one_lwp (lwp, 0, 0, NULL); |
fa593d66 PA |
3937 | } |
3938 | else | |
863d01bd | 3939 | lwp_suspended_inc (lwp); |
fa593d66 PA |
3940 | } |
3941 | ||
5a6b0a41 SM |
3942 | static bool |
3943 | lwp_running (thread_info *thread) | |
fa593d66 | 3944 | { |
d86d4aaf | 3945 | struct lwp_info *lwp = get_thread_lwp (thread); |
fa593d66 | 3946 | |
00db26fa | 3947 | if (lwp_is_marked_dead (lwp)) |
5a6b0a41 SM |
3948 | return false; |
3949 | ||
3950 | return !lwp->stopped; | |
fa593d66 PA |
3951 | } |
3952 | ||
d16f3f6c TBA |
3953 | void |
3954 | linux_process_target::stop_all_lwps (int suspend, lwp_info *except) | |
0d62e5e8 | 3955 | { |
bde24c0a PA |
3956 | /* Should not be called recursively. */ |
3957 | gdb_assert (stopping_threads == NOT_STOPPING_THREADS); | |
3958 | ||
c058728c SM |
3959 | THREADS_SCOPED_DEBUG_ENTER_EXIT; |
3960 | ||
3961 | threads_debug_printf | |
3962 | ("%s, except=%s", suspend ? "stop-and-suspend" : "stop", | |
3963 | (except != NULL | |
3964 | ? target_pid_to_str (ptid_of (get_lwp_thread (except))).c_str () | |
3965 | : "none")); | |
87ce2a04 | 3966 | |
bde24c0a PA |
3967 | stopping_threads = (suspend |
3968 | ? STOPPING_AND_SUSPENDING_THREADS | |
3969 | : STOPPING_THREADS); | |
7984d532 PA |
3970 | |
3971 | if (suspend) | |
df3e4dbe SM |
3972 | for_each_thread ([&] (thread_info *thread) |
3973 | { | |
3974 | suspend_and_send_sigstop (thread, except); | |
3975 | }); | |
7984d532 | 3976 | else |
df3e4dbe SM |
3977 | for_each_thread ([&] (thread_info *thread) |
3978 | { | |
3979 | send_sigstop (thread, except); | |
3980 | }); | |
3981 | ||
fa96cb38 | 3982 | wait_for_sigstop (); |
bde24c0a | 3983 | stopping_threads = NOT_STOPPING_THREADS; |
87ce2a04 | 3984 | |
c058728c | 3985 | threads_debug_printf ("setting stopping_threads back to !stopping"); |
0d62e5e8 DJ |
3986 | } |
3987 | ||
863d01bd PA |
3988 | /* Enqueue one signal in the chain of signals which need to be |
3989 | delivered to this process on next resume. */ | |
3990 | ||
3991 | static void | |
3992 | enqueue_pending_signal (struct lwp_info *lwp, int signal, siginfo_t *info) | |
3993 | { | |
013e3554 TBA |
3994 | lwp->pending_signals.emplace_back (signal); |
3995 | if (info == nullptr) | |
3996 | memset (&lwp->pending_signals.back ().info, 0, sizeof (siginfo_t)); | |
863d01bd | 3997 | else |
013e3554 | 3998 | lwp->pending_signals.back ().info = *info; |
863d01bd PA |
3999 | } |
4000 | ||
df95181f TBA |
4001 | void |
4002 | linux_process_target::install_software_single_step_breakpoints (lwp_info *lwp) | |
fa5308bd | 4003 | { |
984a2c04 YQ |
4004 | struct thread_info *thread = get_lwp_thread (lwp); |
4005 | struct regcache *regcache = get_thread_regcache (thread, 1); | |
8ce47547 | 4006 | |
24583e45 | 4007 | scoped_restore_current_thread restore_thread; |
984a2c04 | 4008 | |
24583e45 | 4009 | switch_to_thread (thread); |
7582c77c | 4010 | std::vector<CORE_ADDR> next_pcs = low_get_next_pcs (regcache); |
fa5308bd | 4011 | |
a0ff9e1a | 4012 | for (CORE_ADDR pc : next_pcs) |
3b9a79ef | 4013 | set_single_step_breakpoint (pc, current_ptid); |
fa5308bd AT |
4014 | } |
4015 | ||
df95181f TBA |
4016 | int |
4017 | linux_process_target::single_step (lwp_info* lwp) | |
7fe5e27e AT |
4018 | { |
4019 | int step = 0; | |
4020 | ||
b31cdfa6 | 4021 | if (supports_hardware_single_step ()) |
7fe5e27e AT |
4022 | { |
4023 | step = 1; | |
4024 | } | |
7582c77c | 4025 | else if (supports_software_single_step ()) |
7fe5e27e AT |
4026 | { |
4027 | install_software_single_step_breakpoints (lwp); | |
4028 | step = 0; | |
4029 | } | |
4030 | else | |
c058728c | 4031 | threads_debug_printf ("stepping is not implemented on this target"); |
7fe5e27e AT |
4032 | |
4033 | return step; | |
4034 | } | |
4035 | ||
35ac8b3e | 4036 | /* The signal can be delivered to the inferior if we are not trying to |
5b061e98 YQ |
4037 | finish a fast tracepoint collect. Since signal can be delivered in |
4038 | the step-over, the program may go to signal handler and trap again | |
4039 | after return from the signal handler. We can live with the spurious | |
4040 | double traps. */ | |
35ac8b3e YQ |
4041 | |
4042 | static int | |
4043 | lwp_signal_can_be_delivered (struct lwp_info *lwp) | |
4044 | { | |
229d26fc SM |
4045 | return (lwp->collecting_fast_tracepoint |
4046 | == fast_tpoint_collect_result::not_collecting); | |
35ac8b3e YQ |
4047 | } |
4048 | ||
df95181f TBA |
4049 | void |
4050 | linux_process_target::resume_one_lwp_throw (lwp_info *lwp, int step, | |
4051 | int signal, siginfo_t *info) | |
da6d8c04 | 4052 | { |
d86d4aaf | 4053 | struct thread_info *thread = get_lwp_thread (lwp); |
82075af2 | 4054 | int ptrace_request; |
c06cbd92 YQ |
4055 | struct process_info *proc = get_thread_process (thread); |
4056 | ||
4057 | /* Note that target description may not be initialised | |
4058 | (proc->tdesc == NULL) at this point because the program hasn't | |
4059 | stopped at the first instruction yet. It means GDBserver skips | |
4060 | the extra traps from the wrapper program (see option --wrapper). | |
4061 | Code in this function that requires register access should be | |
4062 | guarded by proc->tdesc == NULL or something else. */ | |
0d62e5e8 | 4063 | |
54a0b537 | 4064 | if (lwp->stopped == 0) |
0d62e5e8 DJ |
4065 | return; |
4066 | ||
183be222 | 4067 | gdb_assert (lwp->waitstatus.kind () == TARGET_WAITKIND_IGNORE); |
65706a29 | 4068 | |
229d26fc SM |
4069 | fast_tpoint_collect_result fast_tp_collecting |
4070 | = lwp->collecting_fast_tracepoint; | |
fa593d66 | 4071 | |
229d26fc SM |
4072 | gdb_assert (!stabilizing_threads |
4073 | || (fast_tp_collecting | |
4074 | != fast_tpoint_collect_result::not_collecting)); | |
fa593d66 | 4075 | |
219f2f23 PA |
4076 | /* Cancel actions that rely on GDB not changing the PC (e.g., the |
4077 | user used the "jump" command, or "set $pc = foo"). */ | |
c06cbd92 | 4078 | if (thread->while_stepping != NULL && lwp->stop_pc != get_pc (lwp)) |
219f2f23 PA |
4079 | { |
4080 | /* Collecting 'while-stepping' actions doesn't make sense | |
4081 | anymore. */ | |
d86d4aaf | 4082 | release_while_stepping_state_list (thread); |
219f2f23 PA |
4083 | } |
4084 | ||
0d62e5e8 | 4085 | /* If we have pending signals or status, and a new signal, enqueue the |
35ac8b3e YQ |
4086 | signal. Also enqueue the signal if it can't be delivered to the |
4087 | inferior right now. */ | |
0d62e5e8 | 4088 | if (signal != 0 |
fa593d66 | 4089 | && (lwp->status_pending_p |
013e3554 | 4090 | || !lwp->pending_signals.empty () |
35ac8b3e | 4091 | || !lwp_signal_can_be_delivered (lwp))) |
94610ec4 YQ |
4092 | { |
4093 | enqueue_pending_signal (lwp, signal, info); | |
4094 | ||
4095 | /* Postpone any pending signal. It was enqueued above. */ | |
4096 | signal = 0; | |
4097 | } | |
0d62e5e8 | 4098 | |
d50171e4 PA |
4099 | if (lwp->status_pending_p) |
4100 | { | |
c058728c SM |
4101 | threads_debug_printf |
4102 | ("Not resuming lwp %ld (%s, stop %s); has pending status", | |
4103 | lwpid_of (thread), step ? "step" : "continue", | |
4104 | lwp->stop_expected ? "expected" : "not expected"); | |
d50171e4 PA |
4105 | return; |
4106 | } | |
0d62e5e8 | 4107 | |
24583e45 TBA |
4108 | scoped_restore_current_thread restore_thread; |
4109 | switch_to_thread (thread); | |
0d62e5e8 | 4110 | |
0d62e5e8 DJ |
4111 | /* This bit needs some thinking about. If we get a signal that |
4112 | we must report while a single-step reinsert is still pending, | |
4113 | we often end up resuming the thread. It might be better to | |
4114 | (ew) allow a stack of pending events; then we could be sure that | |
4115 | the reinsert happened right away and not lose any signals. | |
4116 | ||
4117 | Making this stack would also shrink the window in which breakpoints are | |
54a0b537 | 4118 | uninserted (see comment in linux_wait_for_lwp) but not enough for |
0d62e5e8 DJ |
4119 | complete correctness, so it won't solve that problem. It may be |
4120 | worthwhile just to solve this one, however. */ | |
54a0b537 | 4121 | if (lwp->bp_reinsert != 0) |
0d62e5e8 | 4122 | { |
c058728c SM |
4123 | threads_debug_printf (" pending reinsert at 0x%s", |
4124 | paddress (lwp->bp_reinsert)); | |
d50171e4 | 4125 | |
b31cdfa6 | 4126 | if (supports_hardware_single_step ()) |
d50171e4 | 4127 | { |
229d26fc | 4128 | if (fast_tp_collecting == fast_tpoint_collect_result::not_collecting) |
fa593d66 PA |
4129 | { |
4130 | if (step == 0) | |
9986ba08 | 4131 | warning ("BAD - reinserting but not stepping."); |
fa593d66 | 4132 | if (lwp->suspended) |
9986ba08 PA |
4133 | warning ("BAD - reinserting and suspended(%d).", |
4134 | lwp->suspended); | |
fa593d66 | 4135 | } |
d50171e4 | 4136 | } |
f79b145d YQ |
4137 | |
4138 | step = maybe_hw_step (thread); | |
0d62e5e8 DJ |
4139 | } |
4140 | ||
229d26fc | 4141 | if (fast_tp_collecting == fast_tpoint_collect_result::before_insn) |
c058728c SM |
4142 | threads_debug_printf |
4143 | ("lwp %ld wants to get out of fast tracepoint jump pad " | |
4144 | "(exit-jump-pad-bkpt)", lwpid_of (thread)); | |
4145 | ||
229d26fc | 4146 | else if (fast_tp_collecting == fast_tpoint_collect_result::at_insn) |
fa593d66 | 4147 | { |
c058728c SM |
4148 | threads_debug_printf |
4149 | ("lwp %ld wants to get out of fast tracepoint jump pad single-stepping", | |
4150 | lwpid_of (thread)); | |
fa593d66 | 4151 | |
b31cdfa6 | 4152 | if (supports_hardware_single_step ()) |
fa593d66 PA |
4153 | step = 1; |
4154 | else | |
38e08fca | 4155 | { |
f34652de | 4156 | internal_error ("moving out of jump pad single-stepping" |
38e08fca GB |
4157 | " not implemented on this target"); |
4158 | } | |
fa593d66 PA |
4159 | } |
4160 | ||
219f2f23 PA |
4161 | /* If we have while-stepping actions in this thread set it stepping. |
4162 | If we have a signal to deliver, it may or may not be set to | |
4163 | SIG_IGN, we don't know. Assume so, and allow collecting | |
4164 | while-stepping into a signal handler. A possible smart thing to | |
4165 | do would be to set an internal breakpoint at the signal return | |
4166 | address, continue, and carry on catching this while-stepping | |
4167 | action only when that breakpoint is hit. A future | |
4168 | enhancement. */ | |
7fe5e27e | 4169 | if (thread->while_stepping != NULL) |
219f2f23 | 4170 | { |
c058728c SM |
4171 | threads_debug_printf |
4172 | ("lwp %ld has a while-stepping action -> forcing step.", | |
4173 | lwpid_of (thread)); | |
7fe5e27e AT |
4174 | |
4175 | step = single_step (lwp); | |
219f2f23 PA |
4176 | } |
4177 | ||
bf9ae9d8 | 4178 | if (proc->tdesc != NULL && low_supports_breakpoints ()) |
0d62e5e8 | 4179 | { |
0bfdf32f | 4180 | struct regcache *regcache = get_thread_regcache (current_thread, 1); |
582511be | 4181 | |
bf9ae9d8 | 4182 | lwp->stop_pc = low_get_pc (regcache); |
582511be | 4183 | |
c058728c SM |
4184 | threads_debug_printf (" %s from pc 0x%lx", step ? "step" : "continue", |
4185 | (long) lwp->stop_pc); | |
0d62e5e8 DJ |
4186 | } |
4187 | ||
35ac8b3e YQ |
4188 | /* If we have pending signals, consume one if it can be delivered to |
4189 | the inferior. */ | |
013e3554 | 4190 | if (!lwp->pending_signals.empty () && lwp_signal_can_be_delivered (lwp)) |
0d62e5e8 | 4191 | { |
013e3554 | 4192 | const pending_signal &p_sig = lwp->pending_signals.front (); |
0d62e5e8 | 4193 | |
013e3554 TBA |
4194 | signal = p_sig.signal; |
4195 | if (p_sig.info.si_signo != 0) | |
d86d4aaf | 4196 | ptrace (PTRACE_SETSIGINFO, lwpid_of (thread), (PTRACE_TYPE_ARG3) 0, |
013e3554 | 4197 | &p_sig.info); |
32ca6d61 | 4198 | |
013e3554 | 4199 | lwp->pending_signals.pop_front (); |
0d62e5e8 DJ |
4200 | } |
4201 | ||
c058728c SM |
4202 | threads_debug_printf ("Resuming lwp %ld (%s, signal %d, stop %s)", |
4203 | lwpid_of (thread), step ? "step" : "continue", signal, | |
4204 | lwp->stop_expected ? "expected" : "not expected"); | |
94610ec4 | 4205 | |
d7599cc0 | 4206 | low_prepare_to_resume (lwp); |
aa5ca48f | 4207 | |
d86d4aaf | 4208 | regcache_invalidate_thread (thread); |
da6d8c04 | 4209 | errno = 0; |
54a0b537 | 4210 | lwp->stepping = step; |
82075af2 JS |
4211 | if (step) |
4212 | ptrace_request = PTRACE_SINGLESTEP; | |
4213 | else if (gdb_catching_syscalls_p (lwp)) | |
4214 | ptrace_request = PTRACE_SYSCALL; | |
4215 | else | |
4216 | ptrace_request = PTRACE_CONT; | |
4217 | ptrace (ptrace_request, | |
4218 | lwpid_of (thread), | |
b8e1b30e | 4219 | (PTRACE_TYPE_ARG3) 0, |
14ce3065 DE |
4220 | /* Coerce to a uintptr_t first to avoid potential gcc warning |
4221 | of coercing an 8 byte integer to a 4 byte pointer. */ | |
b8e1b30e | 4222 | (PTRACE_TYPE_ARG4) (uintptr_t) signal); |
0d62e5e8 | 4223 | |
da6d8c04 | 4224 | if (errno) |
20471e00 SM |
4225 | { |
4226 | int saved_errno = errno; | |
4227 | ||
4228 | threads_debug_printf ("ptrace errno = %d (%s)", | |
4229 | saved_errno, strerror (saved_errno)); | |
4230 | ||
4231 | errno = saved_errno; | |
4232 | perror_with_name ("resuming thread"); | |
4233 | } | |
23f238d3 PA |
4234 | |
4235 | /* Successfully resumed. Clear state that no longer makes sense, | |
4236 | and mark the LWP as running. Must not do this before resuming | |
4237 | otherwise if that fails other code will be confused. E.g., we'd | |
4238 | later try to stop the LWP and hang forever waiting for a stop | |
4239 | status. Note that we must not throw after this is cleared, | |
4240 | otherwise handle_zombie_lwp_error would get confused. */ | |
4241 | lwp->stopped = 0; | |
4242 | lwp->stop_reason = TARGET_STOPPED_BY_NO_REASON; | |
4243 | } | |
4244 | ||
d7599cc0 TBA |
4245 | void |
4246 | linux_process_target::low_prepare_to_resume (lwp_info *lwp) | |
4247 | { | |
4248 | /* Nop. */ | |
4249 | } | |
4250 | ||
23f238d3 PA |
4251 | /* Called when we try to resume a stopped LWP and that errors out. If |
4252 | the LWP is no longer in ptrace-stopped state (meaning it's zombie, | |
4253 | or about to become), discard the error, clear any pending status | |
4254 | the LWP may have, and return true (we'll collect the exit status | |
4255 | soon enough). Otherwise, return false. */ | |
4256 | ||
4257 | static int | |
4258 | check_ptrace_stopped_lwp_gone (struct lwp_info *lp) | |
4259 | { | |
4260 | struct thread_info *thread = get_lwp_thread (lp); | |
4261 | ||
4262 | /* If we get an error after resuming the LWP successfully, we'd | |
4263 | confuse !T state for the LWP being gone. */ | |
4264 | gdb_assert (lp->stopped); | |
4265 | ||
4266 | /* We can't just check whether the LWP is in 'Z (Zombie)' state, | |
4267 | because even if ptrace failed with ESRCH, the tracee may be "not | |
4268 | yet fully dead", but already refusing ptrace requests. In that | |
4269 | case the tracee has 'R (Running)' state for a little bit | |
4270 | (observed in Linux 3.18). See also the note on ESRCH in the | |
4271 | ptrace(2) man page. Instead, check whether the LWP has any state | |
4272 | other than ptrace-stopped. */ | |
4273 | ||
4274 | /* Don't assume anything if /proc/PID/status can't be read. */ | |
4275 | if (linux_proc_pid_is_trace_stopped_nowarn (lwpid_of (thread)) == 0) | |
3221518c | 4276 | { |
23f238d3 PA |
4277 | lp->stop_reason = TARGET_STOPPED_BY_NO_REASON; |
4278 | lp->status_pending_p = 0; | |
4279 | return 1; | |
4280 | } | |
4281 | return 0; | |
4282 | } | |
4283 | ||
df95181f TBA |
4284 | void |
4285 | linux_process_target::resume_one_lwp (lwp_info *lwp, int step, int signal, | |
4286 | siginfo_t *info) | |
23f238d3 | 4287 | { |
a70b8144 | 4288 | try |
23f238d3 | 4289 | { |
df95181f | 4290 | resume_one_lwp_throw (lwp, step, signal, info); |
23f238d3 | 4291 | } |
230d2906 | 4292 | catch (const gdb_exception_error &ex) |
23f238d3 | 4293 | { |
20471e00 SM |
4294 | if (check_ptrace_stopped_lwp_gone (lwp)) |
4295 | { | |
4296 | /* This could because we tried to resume an LWP after its leader | |
4297 | exited. Mark it as resumed, so we can collect an exit event | |
4298 | from it. */ | |
4299 | lwp->stopped = 0; | |
4300 | lwp->stop_reason = TARGET_STOPPED_BY_NO_REASON; | |
4301 | } | |
4302 | else | |
eedc3f4f | 4303 | throw; |
3221518c | 4304 | } |
da6d8c04 DJ |
4305 | } |
4306 | ||
5fdda392 SM |
4307 | /* This function is called once per thread via for_each_thread. |
4308 | We look up which resume request applies to THREAD and mark it with a | |
4309 | pointer to the appropriate resume request. | |
5544ad89 DJ |
4310 | |
4311 | This algorithm is O(threads * resume elements), but resume elements | |
4312 | is small (and will remain small at least until GDB supports thread | |
4313 | suspension). */ | |
ebcf782c | 4314 | |
5fdda392 SM |
4315 | static void |
4316 | linux_set_resume_request (thread_info *thread, thread_resume *resume, size_t n) | |
0d62e5e8 | 4317 | { |
d86d4aaf | 4318 | struct lwp_info *lwp = get_thread_lwp (thread); |
64386c31 | 4319 | |
5fdda392 | 4320 | for (int ndx = 0; ndx < n; ndx++) |
95954743 | 4321 | { |
5fdda392 | 4322 | ptid_t ptid = resume[ndx].thread; |
d7e15655 | 4323 | if (ptid == minus_one_ptid |
9c80ecd6 | 4324 | || ptid == thread->id |
0c9070b3 YQ |
4325 | /* Handle both 'pPID' and 'pPID.-1' as meaning 'all threads |
4326 | of PID'. */ | |
e99b03dc | 4327 | || (ptid.pid () == pid_of (thread) |
0e998d96 | 4328 | && (ptid.is_pid () |
e38504b3 | 4329 | || ptid.lwp () == -1))) |
95954743 | 4330 | { |
5fdda392 | 4331 | if (resume[ndx].kind == resume_stop |
8336d594 | 4332 | && thread->last_resume_kind == resume_stop) |
d50171e4 | 4333 | { |
c058728c SM |
4334 | threads_debug_printf |
4335 | ("already %s LWP %ld at GDB's request", | |
4336 | (thread->last_status.kind () == TARGET_WAITKIND_STOPPED | |
4337 | ? "stopped" : "stopping"), | |
4338 | lwpid_of (thread)); | |
d50171e4 PA |
4339 | |
4340 | continue; | |
4341 | } | |
4342 | ||
5a04c4cf PA |
4343 | /* Ignore (wildcard) resume requests for already-resumed |
4344 | threads. */ | |
5fdda392 | 4345 | if (resume[ndx].kind != resume_stop |
5a04c4cf PA |
4346 | && thread->last_resume_kind != resume_stop) |
4347 | { | |
c058728c SM |
4348 | threads_debug_printf |
4349 | ("already %s LWP %ld at GDB's request", | |
4350 | (thread->last_resume_kind == resume_step | |
4351 | ? "stepping" : "continuing"), | |
4352 | lwpid_of (thread)); | |
5a04c4cf PA |
4353 | continue; |
4354 | } | |
4355 | ||
393a6b59 PA |
4356 | /* Don't let wildcard resumes resume fork/vfork/clone |
4357 | children that GDB does not yet know are new children. */ | |
4358 | if (lwp->relative != NULL) | |
5a04c4cf | 4359 | { |
393a6b59 | 4360 | struct lwp_info *rel = lwp->relative; |
5a04c4cf PA |
4361 | |
4362 | if (rel->status_pending_p | |
393a6b59 | 4363 | && is_new_child_status (rel->waitstatus.kind ())) |
5a04c4cf | 4364 | { |
c058728c SM |
4365 | threads_debug_printf |
4366 | ("not resuming LWP %ld: has queued stop reply", | |
4367 | lwpid_of (thread)); | |
5a04c4cf PA |
4368 | continue; |
4369 | } | |
4370 | } | |
4371 | ||
4372 | /* If the thread has a pending event that has already been | |
4373 | reported to GDBserver core, but GDB has not pulled the | |
4374 | event out of the vStopped queue yet, likewise, ignore the | |
4375 | (wildcard) resume request. */ | |
9c80ecd6 | 4376 | if (in_queued_stop_replies (thread->id)) |
5a04c4cf | 4377 | { |
c058728c SM |
4378 | threads_debug_printf |
4379 | ("not resuming LWP %ld: has queued stop reply", | |
4380 | lwpid_of (thread)); | |
5a04c4cf PA |
4381 | continue; |
4382 | } | |
4383 | ||
5fdda392 | 4384 | lwp->resume = &resume[ndx]; |
8336d594 | 4385 | thread->last_resume_kind = lwp->resume->kind; |
fa593d66 | 4386 | |
c2d6af84 PA |
4387 | lwp->step_range_start = lwp->resume->step_range_start; |
4388 | lwp->step_range_end = lwp->resume->step_range_end; | |
4389 | ||
fa593d66 PA |
4390 | /* If we had a deferred signal to report, dequeue one now. |
4391 | This can happen if LWP gets more than one signal while | |
4392 | trying to get out of a jump pad. */ | |
4393 | if (lwp->stopped | |
4394 | && !lwp->status_pending_p | |
4395 | && dequeue_one_deferred_signal (lwp, &lwp->status_pending)) | |
4396 | { | |
4397 | lwp->status_pending_p = 1; | |
4398 | ||
c058728c SM |
4399 | threads_debug_printf |
4400 | ("Dequeueing deferred signal %d for LWP %ld, " | |
4401 | "leaving status pending.", | |
4402 | WSTOPSIG (lwp->status_pending), | |
4403 | lwpid_of (thread)); | |
fa593d66 PA |
4404 | } |
4405 | ||
5fdda392 | 4406 | return; |
95954743 PA |
4407 | } |
4408 | } | |
2bd7c093 PA |
4409 | |
4410 | /* No resume action for this thread. */ | |
4411 | lwp->resume = NULL; | |
5544ad89 DJ |
4412 | } |
4413 | ||
df95181f TBA |
4414 | bool |
4415 | linux_process_target::resume_status_pending (thread_info *thread) | |
5544ad89 | 4416 | { |
d86d4aaf | 4417 | struct lwp_info *lwp = get_thread_lwp (thread); |
5544ad89 | 4418 | |
bd99dc85 PA |
4419 | /* LWPs which will not be resumed are not interesting, because |
4420 | we might not wait for them next time through linux_wait. */ | |
2bd7c093 | 4421 | if (lwp->resume == NULL) |
25c28b4d | 4422 | return false; |
64386c31 | 4423 | |
df95181f | 4424 | return thread_still_has_status_pending (thread); |
d50171e4 PA |
4425 | } |
4426 | ||
df95181f TBA |
4427 | bool |
4428 | linux_process_target::thread_needs_step_over (thread_info *thread) | |
d50171e4 | 4429 | { |
d86d4aaf | 4430 | struct lwp_info *lwp = get_thread_lwp (thread); |
d50171e4 | 4431 | CORE_ADDR pc; |
c06cbd92 YQ |
4432 | struct process_info *proc = get_thread_process (thread); |
4433 | ||
4434 | /* GDBserver is skipping the extra traps from the wrapper program, | |
4435 | don't have to do step over. */ | |
4436 | if (proc->tdesc == NULL) | |
eca55aec | 4437 | return false; |
d50171e4 PA |
4438 | |
4439 | /* LWPs which will not be resumed are not interesting, because we | |
4440 | might not wait for them next time through linux_wait. */ | |
4441 | ||
4442 | if (!lwp->stopped) | |
4443 | { | |
c058728c SM |
4444 | threads_debug_printf ("Need step over [LWP %ld]? Ignoring, not stopped", |
4445 | lwpid_of (thread)); | |
eca55aec | 4446 | return false; |
d50171e4 PA |
4447 | } |
4448 | ||
8336d594 | 4449 | if (thread->last_resume_kind == resume_stop) |
d50171e4 | 4450 | { |
c058728c SM |
4451 | threads_debug_printf |
4452 | ("Need step over [LWP %ld]? Ignoring, should remain stopped", | |
4453 | lwpid_of (thread)); | |
eca55aec | 4454 | return false; |
d50171e4 PA |
4455 | } |
4456 | ||
7984d532 PA |
4457 | gdb_assert (lwp->suspended >= 0); |
4458 | ||
4459 | if (lwp->suspended) | |
4460 | { | |
c058728c SM |
4461 | threads_debug_printf ("Need step over [LWP %ld]? Ignoring, suspended", |
4462 | lwpid_of (thread)); | |
eca55aec | 4463 | return false; |
7984d532 PA |
4464 | } |
4465 | ||
bd99dc85 | 4466 | if (lwp->status_pending_p) |
d50171e4 | 4467 | { |
c058728c SM |
4468 | threads_debug_printf |
4469 | ("Need step over [LWP %ld]? Ignoring, has pending status.", | |
4470 | lwpid_of (thread)); | |
eca55aec | 4471 | return false; |
d50171e4 PA |
4472 | } |
4473 | ||
4474 | /* Note: PC, not STOP_PC. Either GDB has adjusted the PC already, | |
4475 | or we have. */ | |
4476 | pc = get_pc (lwp); | |
4477 | ||
4478 | /* If the PC has changed since we stopped, then don't do anything, | |
4479 | and let the breakpoint/tracepoint be hit. This happens if, for | |
4480 | instance, GDB handled the decr_pc_after_break subtraction itself, | |
4481 | GDB is OOL stepping this thread, or the user has issued a "jump" | |
4482 | command, or poked thread's registers herself. */ | |
4483 | if (pc != lwp->stop_pc) | |
4484 | { | |
c058728c SM |
4485 | threads_debug_printf |
4486 | ("Need step over [LWP %ld]? Cancelling, PC was changed. " | |
4487 | "Old stop_pc was 0x%s, PC is now 0x%s", lwpid_of (thread), | |
4488 | paddress (lwp->stop_pc), paddress (pc)); | |
eca55aec | 4489 | return false; |
d50171e4 PA |
4490 | } |
4491 | ||
484b3c32 YQ |
4492 | /* On software single step target, resume the inferior with signal |
4493 | rather than stepping over. */ | |
7582c77c | 4494 | if (supports_software_single_step () |
013e3554 | 4495 | && !lwp->pending_signals.empty () |
484b3c32 YQ |
4496 | && lwp_signal_can_be_delivered (lwp)) |
4497 | { | |
c058728c SM |
4498 | threads_debug_printf |
4499 | ("Need step over [LWP %ld]? Ignoring, has pending signals.", | |
4500 | lwpid_of (thread)); | |
484b3c32 | 4501 | |
eca55aec | 4502 | return false; |
484b3c32 YQ |
4503 | } |
4504 | ||
24583e45 TBA |
4505 | scoped_restore_current_thread restore_thread; |
4506 | switch_to_thread (thread); | |
d50171e4 | 4507 | |
8b07ae33 | 4508 | /* We can only step over breakpoints we know about. */ |
fa593d66 | 4509 | if (breakpoint_here (pc) || fast_tracepoint_jump_here (pc)) |
d50171e4 | 4510 | { |
8b07ae33 | 4511 | /* Don't step over a breakpoint that GDB expects to hit |
9f3a5c85 LM |
4512 | though. If the condition is being evaluated on the target's side |
4513 | and it evaluate to false, step over this breakpoint as well. */ | |
4514 | if (gdb_breakpoint_here (pc) | |
d3ce09f5 SS |
4515 | && gdb_condition_true_at_breakpoint (pc) |
4516 | && gdb_no_commands_at_breakpoint (pc)) | |
8b07ae33 | 4517 | { |
c058728c SM |
4518 | threads_debug_printf ("Need step over [LWP %ld]? yes, but found" |
4519 | " GDB breakpoint at 0x%s; skipping step over", | |
4520 | lwpid_of (thread), paddress (pc)); | |
d50171e4 | 4521 | |
eca55aec | 4522 | return false; |
8b07ae33 PA |
4523 | } |
4524 | else | |
4525 | { | |
c058728c SM |
4526 | threads_debug_printf ("Need step over [LWP %ld]? yes, " |
4527 | "found breakpoint at 0x%s", | |
4528 | lwpid_of (thread), paddress (pc)); | |
d50171e4 | 4529 | |
8b07ae33 | 4530 | /* We've found an lwp that needs stepping over --- return 1 so |
8f86d7aa | 4531 | that find_thread stops looking. */ |
eca55aec | 4532 | return true; |
8b07ae33 | 4533 | } |
d50171e4 PA |
4534 | } |
4535 | ||
c058728c SM |
4536 | threads_debug_printf |
4537 | ("Need step over [LWP %ld]? No, no breakpoint found at 0x%s", | |
4538 | lwpid_of (thread), paddress (pc)); | |
c6ecbae5 | 4539 | |
eca55aec | 4540 | return false; |
5544ad89 DJ |
4541 | } |
4542 | ||
d16f3f6c TBA |
4543 | void |
4544 | linux_process_target::start_step_over (lwp_info *lwp) | |
d50171e4 | 4545 | { |
d86d4aaf | 4546 | struct thread_info *thread = get_lwp_thread (lwp); |
d50171e4 | 4547 | CORE_ADDR pc; |
d50171e4 | 4548 | |
c058728c SM |
4549 | threads_debug_printf ("Starting step-over on LWP %ld. Stopping all threads", |
4550 | lwpid_of (thread)); | |
d50171e4 | 4551 | |
7984d532 | 4552 | stop_all_lwps (1, lwp); |
863d01bd PA |
4553 | |
4554 | if (lwp->suspended != 0) | |
4555 | { | |
f34652de | 4556 | internal_error ("LWP %ld suspended=%d\n", lwpid_of (thread), |
863d01bd PA |
4557 | lwp->suspended); |
4558 | } | |
d50171e4 | 4559 | |
c058728c | 4560 | threads_debug_printf ("Done stopping all threads for step-over."); |
d50171e4 PA |
4561 | |
4562 | /* Note, we should always reach here with an already adjusted PC, | |
4563 | either by GDB (if we're resuming due to GDB's request), or by our | |
4564 | caller, if we just finished handling an internal breakpoint GDB | |
4565 | shouldn't care about. */ | |
4566 | pc = get_pc (lwp); | |
4567 | ||
24583e45 TBA |
4568 | bool step = false; |
4569 | { | |
4570 | scoped_restore_current_thread restore_thread; | |
4571 | switch_to_thread (thread); | |
d50171e4 | 4572 | |
24583e45 TBA |
4573 | lwp->bp_reinsert = pc; |
4574 | uninsert_breakpoints_at (pc); | |
4575 | uninsert_fast_tracepoint_jumps_at (pc); | |
d50171e4 | 4576 | |
24583e45 TBA |
4577 | step = single_step (lwp); |
4578 | } | |
d50171e4 | 4579 | |
df95181f | 4580 | resume_one_lwp (lwp, step, 0, NULL); |
d50171e4 PA |
4581 | |
4582 | /* Require next event from this LWP. */ | |
9c80ecd6 | 4583 | step_over_bkpt = thread->id; |
d50171e4 PA |
4584 | } |
4585 | ||
b31cdfa6 TBA |
4586 | bool |
4587 | linux_process_target::finish_step_over (lwp_info *lwp) | |
d50171e4 PA |
4588 | { |
4589 | if (lwp->bp_reinsert != 0) | |
4590 | { | |
24583e45 | 4591 | scoped_restore_current_thread restore_thread; |
f79b145d | 4592 | |
c058728c | 4593 | threads_debug_printf ("Finished step over."); |
d50171e4 | 4594 | |
24583e45 | 4595 | switch_to_thread (get_lwp_thread (lwp)); |
f79b145d | 4596 | |
d50171e4 PA |
4597 | /* Reinsert any breakpoint at LWP->BP_REINSERT. Note that there |
4598 | may be no breakpoint to reinsert there by now. */ | |
4599 | reinsert_breakpoints_at (lwp->bp_reinsert); | |
fa593d66 | 4600 | reinsert_fast_tracepoint_jumps_at (lwp->bp_reinsert); |
d50171e4 PA |
4601 | |
4602 | lwp->bp_reinsert = 0; | |
4603 | ||
3b9a79ef YQ |
4604 | /* Delete any single-step breakpoints. No longer needed. We |
4605 | don't have to worry about other threads hitting this trap, | |
4606 | and later not being able to explain it, because we were | |
4607 | stepping over a breakpoint, and we hold all threads but | |
4608 | LWP stopped while doing that. */ | |
b31cdfa6 | 4609 | if (!supports_hardware_single_step ()) |
f79b145d | 4610 | { |
3b9a79ef YQ |
4611 | gdb_assert (has_single_step_breakpoints (current_thread)); |
4612 | delete_single_step_breakpoints (current_thread); | |
f79b145d | 4613 | } |
d50171e4 PA |
4614 | |
4615 | step_over_bkpt = null_ptid; | |
b31cdfa6 | 4616 | return true; |
d50171e4 PA |
4617 | } |
4618 | else | |
b31cdfa6 | 4619 | return false; |
d50171e4 PA |
4620 | } |
4621 | ||
d16f3f6c TBA |
4622 | void |
4623 | linux_process_target::complete_ongoing_step_over () | |
863d01bd | 4624 | { |
d7e15655 | 4625 | if (step_over_bkpt != null_ptid) |
863d01bd PA |
4626 | { |
4627 | struct lwp_info *lwp; | |
4628 | int wstat; | |
4629 | int ret; | |
4630 | ||
c058728c | 4631 | threads_debug_printf ("detach: step over in progress, finish it first"); |
863d01bd PA |
4632 | |
4633 | /* Passing NULL_PTID as filter indicates we want all events to | |
4634 | be left pending. Eventually this returns when there are no | |
4635 | unwaited-for children left. */ | |
d16f3f6c TBA |
4636 | ret = wait_for_event_filtered (minus_one_ptid, null_ptid, &wstat, |
4637 | __WALL); | |
863d01bd PA |
4638 | gdb_assert (ret == -1); |
4639 | ||
4640 | lwp = find_lwp_pid (step_over_bkpt); | |
4641 | if (lwp != NULL) | |
7e9cf1fe PA |
4642 | { |
4643 | finish_step_over (lwp); | |
4644 | ||
4645 | /* If we got our step SIGTRAP, don't leave it pending, | |
4646 | otherwise we would report it to GDB as a spurious | |
4647 | SIGTRAP. */ | |
4648 | gdb_assert (lwp->status_pending_p); | |
4649 | if (WIFSTOPPED (lwp->status_pending) | |
4650 | && WSTOPSIG (lwp->status_pending) == SIGTRAP) | |
4651 | { | |
4652 | thread_info *thread = get_lwp_thread (lwp); | |
4653 | if (thread->last_resume_kind != resume_step) | |
4654 | { | |
c058728c | 4655 | threads_debug_printf ("detach: discard step-over SIGTRAP"); |
7e9cf1fe PA |
4656 | |
4657 | lwp->status_pending_p = 0; | |
4658 | lwp->status_pending = 0; | |
4659 | resume_one_lwp (lwp, lwp->stepping, 0, NULL); | |
4660 | } | |
4661 | else | |
c058728c SM |
4662 | threads_debug_printf |
4663 | ("detach: resume_step, not discarding step-over SIGTRAP"); | |
7e9cf1fe PA |
4664 | } |
4665 | } | |
863d01bd PA |
4666 | step_over_bkpt = null_ptid; |
4667 | unsuspend_all_lwps (lwp); | |
4668 | } | |
4669 | } | |
4670 | ||
df95181f TBA |
4671 | void |
4672 | linux_process_target::resume_one_thread (thread_info *thread, | |
4673 | bool leave_all_stopped) | |
5544ad89 | 4674 | { |
d86d4aaf | 4675 | struct lwp_info *lwp = get_thread_lwp (thread); |
d50171e4 | 4676 | int leave_pending; |
5544ad89 | 4677 | |
2bd7c093 | 4678 | if (lwp->resume == NULL) |
c80825ff | 4679 | return; |
5544ad89 | 4680 | |
bd99dc85 | 4681 | if (lwp->resume->kind == resume_stop) |
5544ad89 | 4682 | { |
c058728c SM |
4683 | threads_debug_printf ("resume_stop request for LWP %ld", |
4684 | lwpid_of (thread)); | |
bd99dc85 PA |
4685 | |
4686 | if (!lwp->stopped) | |
4687 | { | |
c058728c | 4688 | threads_debug_printf ("stopping LWP %ld", lwpid_of (thread)); |
bd99dc85 | 4689 | |
d50171e4 PA |
4690 | /* Stop the thread, and wait for the event asynchronously, |
4691 | through the event loop. */ | |
02fc4de7 | 4692 | send_sigstop (lwp); |
bd99dc85 PA |
4693 | } |
4694 | else | |
4695 | { | |
c058728c | 4696 | threads_debug_printf ("already stopped LWP %ld", lwpid_of (thread)); |
d50171e4 PA |
4697 | |
4698 | /* The LWP may have been stopped in an internal event that | |
4699 | was not meant to be notified back to GDB (e.g., gdbserver | |
4700 | breakpoint), so we should be reporting a stop event in | |
4701 | this case too. */ | |
4702 | ||
4703 | /* If the thread already has a pending SIGSTOP, this is a | |
4704 | no-op. Otherwise, something later will presumably resume | |
4705 | the thread and this will cause it to cancel any pending | |
4706 | operation, due to last_resume_kind == resume_stop. If | |
4707 | the thread already has a pending status to report, we | |
4708 | will still report it the next time we wait - see | |
4709 | status_pending_p_callback. */ | |
1a981360 PA |
4710 | |
4711 | /* If we already have a pending signal to report, then | |
4712 | there's no need to queue a SIGSTOP, as this means we're | |
4713 | midway through moving the LWP out of the jumppad, and we | |
4714 | will report the pending signal as soon as that is | |
4715 | finished. */ | |
013e3554 | 4716 | if (lwp->pending_signals_to_report.empty ()) |
1a981360 | 4717 | send_sigstop (lwp); |
bd99dc85 | 4718 | } |
32ca6d61 | 4719 | |
bd99dc85 PA |
4720 | /* For stop requests, we're done. */ |
4721 | lwp->resume = NULL; | |
183be222 | 4722 | thread->last_status.set_ignore (); |
c80825ff | 4723 | return; |
5544ad89 DJ |
4724 | } |
4725 | ||
bd99dc85 | 4726 | /* If this thread which is about to be resumed has a pending status, |
863d01bd PA |
4727 | then don't resume it - we can just report the pending status. |
4728 | Likewise if it is suspended, because e.g., another thread is | |
4729 | stepping past a breakpoint. Make sure to queue any signals that | |
4730 | would otherwise be sent. In all-stop mode, we do this decision | |
4731 | based on if *any* thread has a pending status. If there's a | |
4732 | thread that needs the step-over-breakpoint dance, then don't | |
4733 | resume any other thread but that particular one. */ | |
4734 | leave_pending = (lwp->suspended | |
4735 | || lwp->status_pending_p | |
4736 | || leave_all_stopped); | |
5544ad89 | 4737 | |
0e9a339e YQ |
4738 | /* If we have a new signal, enqueue the signal. */ |
4739 | if (lwp->resume->sig != 0) | |
4740 | { | |
4741 | siginfo_t info, *info_p; | |
4742 | ||
4743 | /* If this is the same signal we were previously stopped by, | |
4744 | make sure to queue its siginfo. */ | |
4745 | if (WIFSTOPPED (lwp->last_status) | |
4746 | && WSTOPSIG (lwp->last_status) == lwp->resume->sig | |
4747 | && ptrace (PTRACE_GETSIGINFO, lwpid_of (thread), | |
4748 | (PTRACE_TYPE_ARG3) 0, &info) == 0) | |
4749 | info_p = &info; | |
4750 | else | |
4751 | info_p = NULL; | |
4752 | ||
4753 | enqueue_pending_signal (lwp, lwp->resume->sig, info_p); | |
4754 | } | |
4755 | ||
d50171e4 | 4756 | if (!leave_pending) |
bd99dc85 | 4757 | { |
c058728c | 4758 | threads_debug_printf ("resuming LWP %ld", lwpid_of (thread)); |
5544ad89 | 4759 | |
9c80ecd6 | 4760 | proceed_one_lwp (thread, NULL); |
bd99dc85 PA |
4761 | } |
4762 | else | |
c058728c | 4763 | threads_debug_printf ("leaving LWP %ld stopped", lwpid_of (thread)); |
5544ad89 | 4764 | |
183be222 | 4765 | thread->last_status.set_ignore (); |
bd99dc85 | 4766 | lwp->resume = NULL; |
0d62e5e8 DJ |
4767 | } |
4768 | ||
0e4d7e35 TBA |
4769 | void |
4770 | linux_process_target::resume (thread_resume *resume_info, size_t n) | |
0d62e5e8 | 4771 | { |
d86d4aaf | 4772 | struct thread_info *need_step_over = NULL; |
c6ecbae5 | 4773 | |
c058728c | 4774 | THREADS_SCOPED_DEBUG_ENTER_EXIT; |
87ce2a04 | 4775 | |
5fdda392 SM |
4776 | for_each_thread ([&] (thread_info *thread) |
4777 | { | |
4778 | linux_set_resume_request (thread, resume_info, n); | |
4779 | }); | |
5544ad89 | 4780 | |
d50171e4 PA |
4781 | /* If there is a thread which would otherwise be resumed, which has |
4782 | a pending status, then don't resume any threads - we can just | |
4783 | report the pending status. Make sure to queue any signals that | |
4784 | would otherwise be sent. In non-stop mode, we'll apply this | |
4785 | logic to each thread individually. We consume all pending events | |
4786 | before considering to start a step-over (in all-stop). */ | |
25c28b4d | 4787 | bool any_pending = false; |
bd99dc85 | 4788 | if (!non_stop) |
df95181f TBA |
4789 | any_pending = find_thread ([this] (thread_info *thread) |
4790 | { | |
4791 | return resume_status_pending (thread); | |
4792 | }) != nullptr; | |
d50171e4 PA |
4793 | |
4794 | /* If there is a thread which would otherwise be resumed, which is | |
4795 | stopped at a breakpoint that needs stepping over, then don't | |
4796 | resume any threads - have it step over the breakpoint with all | |
4797 | other threads stopped, then resume all threads again. Make sure | |
4798 | to queue any signals that would otherwise be delivered or | |
4799 | queued. */ | |
bf9ae9d8 | 4800 | if (!any_pending && low_supports_breakpoints ()) |
df95181f TBA |
4801 | need_step_over = find_thread ([this] (thread_info *thread) |
4802 | { | |
4803 | return thread_needs_step_over (thread); | |
4804 | }); | |
d50171e4 | 4805 | |
c80825ff | 4806 | bool leave_all_stopped = (need_step_over != NULL || any_pending); |
d50171e4 | 4807 | |
c058728c SM |
4808 | if (need_step_over != NULL) |
4809 | threads_debug_printf ("Not resuming all, need step over"); | |
4810 | else if (any_pending) | |
4811 | threads_debug_printf ("Not resuming, all-stop and found " | |
4812 | "an LWP with pending status"); | |
4813 | else | |
4814 | threads_debug_printf ("Resuming, no pending status or step over needed"); | |
d50171e4 PA |
4815 | |
4816 | /* Even if we're leaving threads stopped, queue all signals we'd | |
4817 | otherwise deliver. */ | |
c80825ff SM |
4818 | for_each_thread ([&] (thread_info *thread) |
4819 | { | |
df95181f | 4820 | resume_one_thread (thread, leave_all_stopped); |
c80825ff | 4821 | }); |
d50171e4 PA |
4822 | |
4823 | if (need_step_over) | |
d86d4aaf | 4824 | start_step_over (get_thread_lwp (need_step_over)); |
87ce2a04 | 4825 | |
1bebeeca PA |
4826 | /* We may have events that were pending that can/should be sent to |
4827 | the client now. Trigger a linux_wait call. */ | |
4828 | if (target_is_async_p ()) | |
4829 | async_file_mark (); | |
d50171e4 PA |
4830 | } |
4831 | ||
df95181f TBA |
4832 | void |
4833 | linux_process_target::proceed_one_lwp (thread_info *thread, lwp_info *except) | |
d50171e4 | 4834 | { |
d86d4aaf | 4835 | struct lwp_info *lwp = get_thread_lwp (thread); |
d50171e4 PA |
4836 | int step; |
4837 | ||
7984d532 | 4838 | if (lwp == except) |
e2b44075 | 4839 | return; |
d50171e4 | 4840 | |
c058728c | 4841 | threads_debug_printf ("lwp %ld", lwpid_of (thread)); |
d50171e4 PA |
4842 | |
4843 | if (!lwp->stopped) | |
4844 | { | |
c058728c | 4845 | threads_debug_printf (" LWP %ld already running", lwpid_of (thread)); |
e2b44075 | 4846 | return; |
d50171e4 PA |
4847 | } |
4848 | ||
02fc4de7 | 4849 | if (thread->last_resume_kind == resume_stop |
183be222 | 4850 | && thread->last_status.kind () != TARGET_WAITKIND_IGNORE) |
d50171e4 | 4851 | { |
c058728c SM |
4852 | threads_debug_printf (" client wants LWP to remain %ld stopped", |
4853 | lwpid_of (thread)); | |
e2b44075 | 4854 | return; |
d50171e4 PA |
4855 | } |
4856 | ||
4857 | if (lwp->status_pending_p) | |
4858 | { | |
c058728c SM |
4859 | threads_debug_printf (" LWP %ld has pending status, leaving stopped", |
4860 | lwpid_of (thread)); | |
e2b44075 | 4861 | return; |
d50171e4 PA |
4862 | } |
4863 | ||
7984d532 PA |
4864 | gdb_assert (lwp->suspended >= 0); |
4865 | ||
d50171e4 PA |
4866 | if (lwp->suspended) |
4867 | { | |
c058728c | 4868 | threads_debug_printf (" LWP %ld is suspended", lwpid_of (thread)); |
e2b44075 | 4869 | return; |
d50171e4 PA |
4870 | } |
4871 | ||
1a981360 | 4872 | if (thread->last_resume_kind == resume_stop |
013e3554 | 4873 | && lwp->pending_signals_to_report.empty () |
229d26fc SM |
4874 | && (lwp->collecting_fast_tracepoint |
4875 | == fast_tpoint_collect_result::not_collecting)) | |
02fc4de7 PA |
4876 | { |
4877 | /* We haven't reported this LWP as stopped yet (otherwise, the | |
4878 | last_status.kind check above would catch it, and we wouldn't | |
4879 | reach here. This LWP may have been momentarily paused by a | |
4880 | stop_all_lwps call while handling for example, another LWP's | |
4881 | step-over. In that case, the pending expected SIGSTOP signal | |
4882 | that was queued at vCont;t handling time will have already | |
4883 | been consumed by wait_for_sigstop, and so we need to requeue | |
4884 | another one here. Note that if the LWP already has a SIGSTOP | |
4885 | pending, this is a no-op. */ | |
4886 | ||
c058728c SM |
4887 | threads_debug_printf |
4888 | ("Client wants LWP %ld to stop. Making sure it has a SIGSTOP pending", | |
4889 | lwpid_of (thread)); | |
02fc4de7 PA |
4890 | |
4891 | send_sigstop (lwp); | |
4892 | } | |
4893 | ||
863d01bd PA |
4894 | if (thread->last_resume_kind == resume_step) |
4895 | { | |
c058728c SM |
4896 | threads_debug_printf (" stepping LWP %ld, client wants it stepping", |
4897 | lwpid_of (thread)); | |
8901d193 | 4898 | |
3b9a79ef | 4899 | /* If resume_step is requested by GDB, install single-step |
8901d193 | 4900 | breakpoints when the thread is about to be actually resumed if |
3b9a79ef | 4901 | the single-step breakpoints weren't removed. */ |
7582c77c | 4902 | if (supports_software_single_step () |
3b9a79ef | 4903 | && !has_single_step_breakpoints (thread)) |
8901d193 YQ |
4904 | install_software_single_step_breakpoints (lwp); |
4905 | ||
4906 | step = maybe_hw_step (thread); | |
863d01bd PA |
4907 | } |
4908 | else if (lwp->bp_reinsert != 0) | |
4909 | { | |
c058728c SM |
4910 | threads_debug_printf (" stepping LWP %ld, reinsert set", |
4911 | lwpid_of (thread)); | |
f79b145d YQ |
4912 | |
4913 | step = maybe_hw_step (thread); | |
863d01bd PA |
4914 | } |
4915 | else | |
4916 | step = 0; | |
4917 | ||
df95181f | 4918 | resume_one_lwp (lwp, step, 0, NULL); |
7984d532 PA |
4919 | } |
4920 | ||
df95181f TBA |
4921 | void |
4922 | linux_process_target::unsuspend_and_proceed_one_lwp (thread_info *thread, | |
4923 | lwp_info *except) | |
7984d532 | 4924 | { |
d86d4aaf | 4925 | struct lwp_info *lwp = get_thread_lwp (thread); |
7984d532 PA |
4926 | |
4927 | if (lwp == except) | |
e2b44075 | 4928 | return; |
7984d532 | 4929 | |
863d01bd | 4930 | lwp_suspended_decr (lwp); |
7984d532 | 4931 | |
e2b44075 | 4932 | proceed_one_lwp (thread, except); |
d50171e4 PA |
4933 | } |
4934 | ||
d16f3f6c TBA |
4935 | void |
4936 | linux_process_target::proceed_all_lwps () | |
d50171e4 | 4937 | { |
d86d4aaf | 4938 | struct thread_info *need_step_over; |
d50171e4 PA |
4939 | |
4940 | /* If there is a thread which would otherwise be resumed, which is | |
4941 | stopped at a breakpoint that needs stepping over, then don't | |
4942 | resume any threads - have it step over the breakpoint with all | |
4943 | other threads stopped, then resume all threads again. */ | |
4944 | ||
bf9ae9d8 | 4945 | if (low_supports_breakpoints ()) |
d50171e4 | 4946 | { |
df95181f TBA |
4947 | need_step_over = find_thread ([this] (thread_info *thread) |
4948 | { | |
4949 | return thread_needs_step_over (thread); | |
4950 | }); | |
d50171e4 PA |
4951 | |
4952 | if (need_step_over != NULL) | |
4953 | { | |
c058728c SM |
4954 | threads_debug_printf ("found thread %ld needing a step-over", |
4955 | lwpid_of (need_step_over)); | |
d50171e4 | 4956 | |
d86d4aaf | 4957 | start_step_over (get_thread_lwp (need_step_over)); |
d50171e4 PA |
4958 | return; |
4959 | } | |
4960 | } | |
5544ad89 | 4961 | |
c058728c | 4962 | threads_debug_printf ("Proceeding, no step-over needed"); |
d50171e4 | 4963 | |
df95181f | 4964 | for_each_thread ([this] (thread_info *thread) |
e2b44075 SM |
4965 | { |
4966 | proceed_one_lwp (thread, NULL); | |
4967 | }); | |
d50171e4 PA |
4968 | } |
4969 | ||
d16f3f6c TBA |
4970 | void |
4971 | linux_process_target::unstop_all_lwps (int unsuspend, lwp_info *except) | |
d50171e4 | 4972 | { |
c058728c SM |
4973 | THREADS_SCOPED_DEBUG_ENTER_EXIT; |
4974 | ||
4975 | if (except) | |
4976 | threads_debug_printf ("except=(LWP %ld)", | |
4977 | lwpid_of (get_lwp_thread (except))); | |
4978 | else | |
4979 | threads_debug_printf ("except=nullptr"); | |
5544ad89 | 4980 | |
7984d532 | 4981 | if (unsuspend) |
e2b44075 SM |
4982 | for_each_thread ([&] (thread_info *thread) |
4983 | { | |
4984 | unsuspend_and_proceed_one_lwp (thread, except); | |
4985 | }); | |
7984d532 | 4986 | else |
e2b44075 SM |
4987 | for_each_thread ([&] (thread_info *thread) |
4988 | { | |
4989 | proceed_one_lwp (thread, except); | |
4990 | }); | |
0d62e5e8 DJ |
4991 | } |
4992 | ||
58caa3dc DJ |
4993 | |
4994 | #ifdef HAVE_LINUX_REGSETS | |
4995 | ||
1faeff08 MR |
4996 | #define use_linux_regsets 1 |
4997 | ||
030031ee PA |
4998 | /* Returns true if REGSET has been disabled. */ |
4999 | ||
5000 | static int | |
5001 | regset_disabled (struct regsets_info *info, struct regset_info *regset) | |
5002 | { | |
5003 | return (info->disabled_regsets != NULL | |
5004 | && info->disabled_regsets[regset - info->regsets]); | |
5005 | } | |
5006 | ||
5007 | /* Disable REGSET. */ | |
5008 | ||
5009 | static void | |
5010 | disable_regset (struct regsets_info *info, struct regset_info *regset) | |
5011 | { | |
5012 | int dr_offset; | |
5013 | ||
5014 | dr_offset = regset - info->regsets; | |
5015 | if (info->disabled_regsets == NULL) | |
224c3ddb | 5016 | info->disabled_regsets = (char *) xcalloc (1, info->num_regsets); |
030031ee PA |
5017 | info->disabled_regsets[dr_offset] = 1; |
5018 | } | |
5019 | ||
58caa3dc | 5020 | static int |
3aee8918 PA |
5021 | regsets_fetch_inferior_registers (struct regsets_info *regsets_info, |
5022 | struct regcache *regcache) | |
58caa3dc DJ |
5023 | { |
5024 | struct regset_info *regset; | |
e9d25b98 | 5025 | int saw_general_regs = 0; |
95954743 | 5026 | int pid; |
1570b33e | 5027 | struct iovec iov; |
58caa3dc | 5028 | |
0bfdf32f | 5029 | pid = lwpid_of (current_thread); |
28eef672 | 5030 | for (regset = regsets_info->regsets; regset->size >= 0; regset++) |
58caa3dc | 5031 | { |
1570b33e L |
5032 | void *buf, *data; |
5033 | int nt_type, res; | |
58caa3dc | 5034 | |
030031ee | 5035 | if (regset->size == 0 || regset_disabled (regsets_info, regset)) |
28eef672 | 5036 | continue; |
58caa3dc | 5037 | |
bca929d3 | 5038 | buf = xmalloc (regset->size); |
1570b33e L |
5039 | |
5040 | nt_type = regset->nt_type; | |
5041 | if (nt_type) | |
5042 | { | |
5043 | iov.iov_base = buf; | |
5044 | iov.iov_len = regset->size; | |
5045 | data = (void *) &iov; | |
5046 | } | |
5047 | else | |
5048 | data = buf; | |
5049 | ||
dfb64f85 | 5050 | #ifndef __sparc__ |
f15f9948 | 5051 | res = ptrace (regset->get_request, pid, |
b8e1b30e | 5052 | (PTRACE_TYPE_ARG3) (long) nt_type, data); |
dfb64f85 | 5053 | #else |
1570b33e | 5054 | res = ptrace (regset->get_request, pid, data, nt_type); |
dfb64f85 | 5055 | #endif |
58caa3dc DJ |
5056 | if (res < 0) |
5057 | { | |
1ef53e6b AH |
5058 | if (errno == EIO |
5059 | || (errno == EINVAL && regset->type == OPTIONAL_REGS)) | |
58caa3dc | 5060 | { |
1ef53e6b AH |
5061 | /* If we get EIO on a regset, or an EINVAL and the regset is |
5062 | optional, do not try it again for this process mode. */ | |
030031ee | 5063 | disable_regset (regsets_info, regset); |
58caa3dc | 5064 | } |
e5a9158d AA |
5065 | else if (errno == ENODATA) |
5066 | { | |
5067 | /* ENODATA may be returned if the regset is currently | |
5068 | not "active". This can happen in normal operation, | |
5069 | so suppress the warning in this case. */ | |
5070 | } | |
fcd4a73d YQ |
5071 | else if (errno == ESRCH) |
5072 | { | |
5073 | /* At this point, ESRCH should mean the process is | |
5074 | already gone, in which case we simply ignore attempts | |
5075 | to read its registers. */ | |
5076 | } | |
58caa3dc DJ |
5077 | else |
5078 | { | |
0d62e5e8 | 5079 | char s[256]; |
95954743 PA |
5080 | sprintf (s, "ptrace(regsets_fetch_inferior_registers) PID=%d", |
5081 | pid); | |
0d62e5e8 | 5082 | perror (s); |
58caa3dc DJ |
5083 | } |
5084 | } | |
098dbe61 AA |
5085 | else |
5086 | { | |
5087 | if (regset->type == GENERAL_REGS) | |
5088 | saw_general_regs = 1; | |
5089 | regset->store_function (regcache, buf); | |
5090 | } | |
fdeb2a12 | 5091 | free (buf); |
58caa3dc | 5092 | } |
e9d25b98 DJ |
5093 | if (saw_general_regs) |
5094 | return 0; | |
5095 | else | |
5096 | return 1; | |
58caa3dc DJ |
5097 | } |
5098 | ||
5099 | static int | |
3aee8918 PA |
5100 | regsets_store_inferior_registers (struct regsets_info *regsets_info, |
5101 | struct regcache *regcache) | |
58caa3dc DJ |
5102 | { |
5103 | struct regset_info *regset; | |
e9d25b98 | 5104 | int saw_general_regs = 0; |
95954743 | 5105 | int pid; |
1570b33e | 5106 | struct iovec iov; |
58caa3dc | 5107 | |
0bfdf32f | 5108 | pid = lwpid_of (current_thread); |
28eef672 | 5109 | for (regset = regsets_info->regsets; regset->size >= 0; regset++) |
58caa3dc | 5110 | { |
1570b33e L |
5111 | void *buf, *data; |
5112 | int nt_type, res; | |
58caa3dc | 5113 | |
feea5f36 AA |
5114 | if (regset->size == 0 || regset_disabled (regsets_info, regset) |
5115 | || regset->fill_function == NULL) | |
28eef672 | 5116 | continue; |
58caa3dc | 5117 | |
bca929d3 | 5118 | buf = xmalloc (regset->size); |
545587ee DJ |
5119 | |
5120 | /* First fill the buffer with the current register set contents, | |
5121 | in case there are any items in the kernel's regset that are | |
5122 | not in gdbserver's regcache. */ | |
1570b33e L |
5123 | |
5124 | nt_type = regset->nt_type; | |
5125 | if (nt_type) | |
5126 | { | |
5127 | iov.iov_base = buf; | |
5128 | iov.iov_len = regset->size; | |
5129 | data = (void *) &iov; | |
5130 | } | |
5131 | else | |
5132 | data = buf; | |
5133 | ||
dfb64f85 | 5134 | #ifndef __sparc__ |
f15f9948 | 5135 | res = ptrace (regset->get_request, pid, |
b8e1b30e | 5136 | (PTRACE_TYPE_ARG3) (long) nt_type, data); |
dfb64f85 | 5137 | #else |
689cc2ae | 5138 | res = ptrace (regset->get_request, pid, data, nt_type); |
dfb64f85 | 5139 | #endif |
545587ee DJ |
5140 | |
5141 | if (res == 0) | |
5142 | { | |
5143 | /* Then overlay our cached registers on that. */ | |
442ea881 | 5144 | regset->fill_function (regcache, buf); |
545587ee DJ |
5145 | |
5146 | /* Only now do we write the register set. */ | |
dfb64f85 | 5147 | #ifndef __sparc__ |
f15f9948 | 5148 | res = ptrace (regset->set_request, pid, |
b8e1b30e | 5149 | (PTRACE_TYPE_ARG3) (long) nt_type, data); |
dfb64f85 | 5150 | #else |
1570b33e | 5151 | res = ptrace (regset->set_request, pid, data, nt_type); |
dfb64f85 | 5152 | #endif |
545587ee DJ |
5153 | } |
5154 | ||
58caa3dc DJ |
5155 | if (res < 0) |
5156 | { | |
1ef53e6b AH |
5157 | if (errno == EIO |
5158 | || (errno == EINVAL && regset->type == OPTIONAL_REGS)) | |
58caa3dc | 5159 | { |
1ef53e6b AH |
5160 | /* If we get EIO on a regset, or an EINVAL and the regset is |
5161 | optional, do not try it again for this process mode. */ | |
030031ee | 5162 | disable_regset (regsets_info, regset); |
58caa3dc | 5163 | } |
3221518c UW |
5164 | else if (errno == ESRCH) |
5165 | { | |
1b3f6016 PA |
5166 | /* At this point, ESRCH should mean the process is |
5167 | already gone, in which case we simply ignore attempts | |
5168 | to change its registers. See also the related | |
df95181f | 5169 | comment in resume_one_lwp. */ |
fdeb2a12 | 5170 | free (buf); |
3221518c UW |
5171 | return 0; |
5172 | } | |
58caa3dc DJ |
5173 | else |
5174 | { | |
ce3a066d | 5175 | perror ("Warning: ptrace(regsets_store_inferior_registers)"); |
58caa3dc DJ |
5176 | } |
5177 | } | |
e9d25b98 DJ |
5178 | else if (regset->type == GENERAL_REGS) |
5179 | saw_general_regs = 1; | |
09ec9b38 | 5180 | free (buf); |
58caa3dc | 5181 | } |
e9d25b98 DJ |
5182 | if (saw_general_regs) |
5183 | return 0; | |
5184 | else | |
5185 | return 1; | |
58caa3dc DJ |
5186 | } |
5187 | ||
1faeff08 | 5188 | #else /* !HAVE_LINUX_REGSETS */ |
58caa3dc | 5189 | |
1faeff08 | 5190 | #define use_linux_regsets 0 |
3aee8918 PA |
5191 | #define regsets_fetch_inferior_registers(regsets_info, regcache) 1 |
5192 | #define regsets_store_inferior_registers(regsets_info, regcache) 1 | |
58caa3dc | 5193 | |
58caa3dc | 5194 | #endif |
1faeff08 MR |
5195 | |
5196 | /* Return 1 if register REGNO is supported by one of the regset ptrace | |
5197 | calls or 0 if it has to be transferred individually. */ | |
5198 | ||
5199 | static int | |
3aee8918 | 5200 | linux_register_in_regsets (const struct regs_info *regs_info, int regno) |
1faeff08 MR |
5201 | { |
5202 | unsigned char mask = 1 << (regno % 8); | |
5203 | size_t index = regno / 8; | |
5204 | ||
5205 | return (use_linux_regsets | |
3aee8918 PA |
5206 | && (regs_info->regset_bitmap == NULL |
5207 | || (regs_info->regset_bitmap[index] & mask) != 0)); | |
1faeff08 MR |
5208 | } |
5209 | ||
58caa3dc | 5210 | #ifdef HAVE_LINUX_USRREGS |
1faeff08 | 5211 | |
5b3da067 | 5212 | static int |
3aee8918 | 5213 | register_addr (const struct usrregs_info *usrregs, int regnum) |
1faeff08 MR |
5214 | { |
5215 | int addr; | |
5216 | ||
3aee8918 | 5217 | if (regnum < 0 || regnum >= usrregs->num_regs) |
1faeff08 MR |
5218 | error ("Invalid register number %d.", regnum); |
5219 | ||
3aee8918 | 5220 | addr = usrregs->regmap[regnum]; |
1faeff08 MR |
5221 | |
5222 | return addr; | |
5223 | } | |
5224 | ||
daca57a7 TBA |
5225 | |
5226 | void | |
5227 | linux_process_target::fetch_register (const usrregs_info *usrregs, | |
5228 | regcache *regcache, int regno) | |
1faeff08 MR |
5229 | { |
5230 | CORE_ADDR regaddr; | |
5231 | int i, size; | |
5232 | char *buf; | |
5233 | int pid; | |
5234 | ||
3aee8918 | 5235 | if (regno >= usrregs->num_regs) |
1faeff08 | 5236 | return; |
daca57a7 | 5237 | if (low_cannot_fetch_register (regno)) |
1faeff08 MR |
5238 | return; |
5239 | ||
3aee8918 | 5240 | regaddr = register_addr (usrregs, regno); |
1faeff08 MR |
5241 | if (regaddr == -1) |
5242 | return; | |
5243 | ||
3aee8918 PA |
5244 | size = ((register_size (regcache->tdesc, regno) |
5245 | + sizeof (PTRACE_XFER_TYPE) - 1) | |
1faeff08 | 5246 | & -sizeof (PTRACE_XFER_TYPE)); |
224c3ddb | 5247 | buf = (char *) alloca (size); |
1faeff08 | 5248 | |
0bfdf32f | 5249 | pid = lwpid_of (current_thread); |
1faeff08 MR |
5250 | for (i = 0; i < size; i += sizeof (PTRACE_XFER_TYPE)) |
5251 | { | |
5252 | errno = 0; | |
5253 | *(PTRACE_XFER_TYPE *) (buf + i) = | |
5254 | ptrace (PTRACE_PEEKUSER, pid, | |
5255 | /* Coerce to a uintptr_t first to avoid potential gcc warning | |
5256 | of coercing an 8 byte integer to a 4 byte pointer. */ | |
b8e1b30e | 5257 | (PTRACE_TYPE_ARG3) (uintptr_t) regaddr, (PTRACE_TYPE_ARG4) 0); |
1faeff08 MR |
5258 | regaddr += sizeof (PTRACE_XFER_TYPE); |
5259 | if (errno != 0) | |
9a70f35c YQ |
5260 | { |
5261 | /* Mark register REGNO unavailable. */ | |
5262 | supply_register (regcache, regno, NULL); | |
5263 | return; | |
5264 | } | |
1faeff08 MR |
5265 | } |
5266 | ||
b35db733 | 5267 | low_supply_ptrace_register (regcache, regno, buf); |
1faeff08 MR |
5268 | } |
5269 | ||
daca57a7 TBA |
5270 | void |
5271 | linux_process_target::store_register (const usrregs_info *usrregs, | |
5272 | regcache *regcache, int regno) | |
1faeff08 MR |
5273 | { |
5274 | CORE_ADDR regaddr; | |
5275 | int i, size; | |
5276 | char *buf; | |
5277 | int pid; | |
5278 | ||
3aee8918 | 5279 | if (regno >= usrregs->num_regs) |
1faeff08 | 5280 | return; |
daca57a7 | 5281 | if (low_cannot_store_register (regno)) |
1faeff08 MR |
5282 | return; |
5283 | ||
3aee8918 | 5284 | regaddr = register_addr (usrregs, regno); |
1faeff08 MR |
5285 | if (regaddr == -1) |
5286 | return; | |
5287 | ||
3aee8918 PA |
5288 | size = ((register_size (regcache->tdesc, regno) |
5289 | + sizeof (PTRACE_XFER_TYPE) - 1) | |
1faeff08 | 5290 | & -sizeof (PTRACE_XFER_TYPE)); |
224c3ddb | 5291 | buf = (char *) alloca (size); |
1faeff08 MR |
5292 | memset (buf, 0, size); |
5293 | ||
b35db733 | 5294 | low_collect_ptrace_register (regcache, regno, buf); |
1faeff08 | 5295 | |
0bfdf32f | 5296 | pid = lwpid_of (current_thread); |
1faeff08 MR |
5297 | for (i = 0; i < size; i += sizeof (PTRACE_XFER_TYPE)) |
5298 | { | |
5299 | errno = 0; | |
5300 | ptrace (PTRACE_POKEUSER, pid, | |
5301 | /* Coerce to a uintptr_t first to avoid potential gcc warning | |
5302 | about coercing an 8 byte integer to a 4 byte pointer. */ | |
b8e1b30e LM |
5303 | (PTRACE_TYPE_ARG3) (uintptr_t) regaddr, |
5304 | (PTRACE_TYPE_ARG4) *(PTRACE_XFER_TYPE *) (buf + i)); | |
1faeff08 MR |
5305 | if (errno != 0) |
5306 | { | |
5307 | /* At this point, ESRCH should mean the process is | |
5308 | already gone, in which case we simply ignore attempts | |
5309 | to change its registers. See also the related | |
df95181f | 5310 | comment in resume_one_lwp. */ |
1faeff08 MR |
5311 | if (errno == ESRCH) |
5312 | return; | |
5313 | ||
daca57a7 TBA |
5314 | |
5315 | if (!low_cannot_store_register (regno)) | |
6d91ce9a | 5316 | error ("writing register %d: %s", regno, safe_strerror (errno)); |
1faeff08 MR |
5317 | } |
5318 | regaddr += sizeof (PTRACE_XFER_TYPE); | |
5319 | } | |
5320 | } | |
daca57a7 | 5321 | #endif /* HAVE_LINUX_USRREGS */ |
1faeff08 | 5322 | |
b35db733 TBA |
5323 | void |
5324 | linux_process_target::low_collect_ptrace_register (regcache *regcache, | |
5325 | int regno, char *buf) | |
5326 | { | |
5327 | collect_register (regcache, regno, buf); | |
5328 | } | |
5329 | ||
5330 | void | |
5331 | linux_process_target::low_supply_ptrace_register (regcache *regcache, | |
5332 | int regno, const char *buf) | |
5333 | { | |
5334 | supply_register (regcache, regno, buf); | |
5335 | } | |
5336 | ||
daca57a7 TBA |
5337 | void |
5338 | linux_process_target::usr_fetch_inferior_registers (const regs_info *regs_info, | |
5339 | regcache *regcache, | |
5340 | int regno, int all) | |
1faeff08 | 5341 | { |
daca57a7 | 5342 | #ifdef HAVE_LINUX_USRREGS |
3aee8918 PA |
5343 | struct usrregs_info *usr = regs_info->usrregs; |
5344 | ||
1faeff08 MR |
5345 | if (regno == -1) |
5346 | { | |
3aee8918 PA |
5347 | for (regno = 0; regno < usr->num_regs; regno++) |
5348 | if (all || !linux_register_in_regsets (regs_info, regno)) | |
5349 | fetch_register (usr, regcache, regno); | |
1faeff08 MR |
5350 | } |
5351 | else | |
3aee8918 | 5352 | fetch_register (usr, regcache, regno); |
daca57a7 | 5353 | #endif |
1faeff08 MR |
5354 | } |
5355 | ||
daca57a7 TBA |
5356 | void |
5357 | linux_process_target::usr_store_inferior_registers (const regs_info *regs_info, | |
5358 | regcache *regcache, | |
5359 | int regno, int all) | |
1faeff08 | 5360 | { |
daca57a7 | 5361 | #ifdef HAVE_LINUX_USRREGS |
3aee8918 PA |
5362 | struct usrregs_info *usr = regs_info->usrregs; |
5363 | ||
1faeff08 MR |
5364 | if (regno == -1) |
5365 | { | |
3aee8918 PA |
5366 | for (regno = 0; regno < usr->num_regs; regno++) |
5367 | if (all || !linux_register_in_regsets (regs_info, regno)) | |
5368 | store_register (usr, regcache, regno); | |
1faeff08 MR |
5369 | } |
5370 | else | |
3aee8918 | 5371 | store_register (usr, regcache, regno); |
58caa3dc | 5372 | #endif |
daca57a7 | 5373 | } |
1faeff08 | 5374 | |
a5a4d4cd TBA |
5375 | void |
5376 | linux_process_target::fetch_registers (regcache *regcache, int regno) | |
1faeff08 MR |
5377 | { |
5378 | int use_regsets; | |
5379 | int all = 0; | |
aa8d21c9 | 5380 | const regs_info *regs_info = get_regs_info (); |
1faeff08 MR |
5381 | |
5382 | if (regno == -1) | |
5383 | { | |
bd70b1f2 | 5384 | if (regs_info->usrregs != NULL) |
3aee8918 | 5385 | for (regno = 0; regno < regs_info->usrregs->num_regs; regno++) |
bd70b1f2 | 5386 | low_fetch_register (regcache, regno); |
c14dfd32 | 5387 | |
3aee8918 PA |
5388 | all = regsets_fetch_inferior_registers (regs_info->regsets_info, regcache); |
5389 | if (regs_info->usrregs != NULL) | |
5390 | usr_fetch_inferior_registers (regs_info, regcache, -1, all); | |
1faeff08 MR |
5391 | } |
5392 | else | |
5393 | { | |
bd70b1f2 | 5394 | if (low_fetch_register (regcache, regno)) |
c14dfd32 PA |
5395 | return; |
5396 | ||
3aee8918 | 5397 | use_regsets = linux_register_in_regsets (regs_info, regno); |
1faeff08 | 5398 | if (use_regsets) |
3aee8918 PA |
5399 | all = regsets_fetch_inferior_registers (regs_info->regsets_info, |
5400 | regcache); | |
5401 | if ((!use_regsets || all) && regs_info->usrregs != NULL) | |
5402 | usr_fetch_inferior_registers (regs_info, regcache, regno, 1); | |
1faeff08 | 5403 | } |
58caa3dc DJ |
5404 | } |
5405 | ||
a5a4d4cd TBA |
5406 | void |
5407 | linux_process_target::store_registers (regcache *regcache, int regno) | |
58caa3dc | 5408 | { |
1faeff08 MR |
5409 | int use_regsets; |
5410 | int all = 0; | |
aa8d21c9 | 5411 | const regs_info *regs_info = get_regs_info (); |
1faeff08 MR |
5412 | |
5413 | if (regno == -1) | |
5414 | { | |
3aee8918 PA |
5415 | all = regsets_store_inferior_registers (regs_info->regsets_info, |
5416 | regcache); | |
5417 | if (regs_info->usrregs != NULL) | |
5418 | usr_store_inferior_registers (regs_info, regcache, regno, all); | |
1faeff08 MR |
5419 | } |
5420 | else | |
5421 | { | |
3aee8918 | 5422 | use_regsets = linux_register_in_regsets (regs_info, regno); |
1faeff08 | 5423 | if (use_regsets) |
3aee8918 PA |
5424 | all = regsets_store_inferior_registers (regs_info->regsets_info, |
5425 | regcache); | |
5426 | if ((!use_regsets || all) && regs_info->usrregs != NULL) | |
5427 | usr_store_inferior_registers (regs_info, regcache, regno, 1); | |
1faeff08 | 5428 | } |
58caa3dc DJ |
5429 | } |
5430 | ||
bd70b1f2 TBA |
5431 | bool |
5432 | linux_process_target::low_fetch_register (regcache *regcache, int regno) | |
5433 | { | |
5434 | return false; | |
5435 | } | |
da6d8c04 | 5436 | |
e2558df3 | 5437 | /* A wrapper for the read_memory target op. */ |
da6d8c04 | 5438 | |
c3e735a6 | 5439 | static int |
f450004a | 5440 | linux_read_memory (CORE_ADDR memaddr, unsigned char *myaddr, int len) |
e2558df3 | 5441 | { |
52405d85 | 5442 | return the_target->read_memory (memaddr, myaddr, len); |
e2558df3 TBA |
5443 | } |
5444 | ||
e2558df3 | 5445 | |
421490af PA |
5446 | /* Helper for read_memory/write_memory using /proc/PID/mem. Because |
5447 | we can use a single read/write call, this can be much more | |
5448 | efficient than banging away at PTRACE_PEEKTEXT. Also, unlike | |
5449 | PTRACE_PEEKTEXT/PTRACE_POKETEXT, this works with running threads. | |
5450 | One an only one of READBUF and WRITEBUF is non-null. If READBUF is | |
5451 | not null, then we're reading, otherwise we're writing. */ | |
5452 | ||
5453 | static int | |
5454 | proc_xfer_memory (CORE_ADDR memaddr, unsigned char *readbuf, | |
5455 | const gdb_byte *writebuf, int len) | |
da6d8c04 | 5456 | { |
421490af | 5457 | gdb_assert ((readbuf == nullptr) != (writebuf == nullptr)); |
fd462a61 | 5458 | |
421490af PA |
5459 | process_info *proc = current_process (); |
5460 | ||
5461 | int fd = proc->priv->mem_fd; | |
5462 | if (fd == -1) | |
5463 | return EIO; | |
5464 | ||
5465 | while (len > 0) | |
fd462a61 | 5466 | { |
4934b29e MR |
5467 | int bytes; |
5468 | ||
31a56a22 PA |
5469 | /* Use pread64/pwrite64 if available, since they save a syscall |
5470 | and can handle 64-bit offsets even on 32-bit platforms (for | |
5471 | instance, SPARC debugging a SPARC64 application). But only | |
5472 | use them if the offset isn't so high that when cast to off_t | |
5473 | it'd be negative, as seen on SPARC64. pread64/pwrite64 | |
5474 | outright reject such offsets. lseek does not. */ | |
fd462a61 | 5475 | #ifdef HAVE_PREAD64 |
31a56a22 | 5476 | if ((off_t) memaddr >= 0) |
421490af | 5477 | bytes = (readbuf != nullptr |
31a56a22 PA |
5478 | ? pread64 (fd, readbuf, len, memaddr) |
5479 | : pwrite64 (fd, writebuf, len, memaddr)); | |
5480 | else | |
fd462a61 | 5481 | #endif |
31a56a22 PA |
5482 | { |
5483 | bytes = -1; | |
5484 | if (lseek (fd, memaddr, SEEK_SET) != -1) | |
5485 | bytes = (readbuf != nullptr | |
5486 | ? read (fd, readbuf, len) | |
5487 | : write (fd, writebuf, len)); | |
5488 | } | |
fd462a61 | 5489 | |
421490af PA |
5490 | if (bytes < 0) |
5491 | return errno; | |
5492 | else if (bytes == 0) | |
4934b29e | 5493 | { |
421490af PA |
5494 | /* EOF means the address space is gone, the whole process |
5495 | exited or execed. */ | |
5496 | return EIO; | |
4934b29e | 5497 | } |
da6d8c04 | 5498 | |
421490af PA |
5499 | memaddr += bytes; |
5500 | if (readbuf != nullptr) | |
5501 | readbuf += bytes; | |
5502 | else | |
5503 | writebuf += bytes; | |
5504 | len -= bytes; | |
da6d8c04 DJ |
5505 | } |
5506 | ||
421490af PA |
5507 | return 0; |
5508 | } | |
c3e735a6 | 5509 | |
421490af PA |
5510 | int |
5511 | linux_process_target::read_memory (CORE_ADDR memaddr, | |
5512 | unsigned char *myaddr, int len) | |
5513 | { | |
5514 | return proc_xfer_memory (memaddr, myaddr, nullptr, len); | |
da6d8c04 DJ |
5515 | } |
5516 | ||
93ae6fdc PA |
5517 | /* Copy LEN bytes of data from debugger memory at MYADDR to inferior's |
5518 | memory at MEMADDR. On failure (cannot write to the inferior) | |
f0ae6fc3 | 5519 | returns the value of errno. Always succeeds if LEN is zero. */ |
da6d8c04 | 5520 | |
e2558df3 TBA |
5521 | int |
5522 | linux_process_target::write_memory (CORE_ADDR memaddr, | |
5523 | const unsigned char *myaddr, int len) | |
da6d8c04 | 5524 | { |
0d62e5e8 DJ |
5525 | if (debug_threads) |
5526 | { | |
58d6951d | 5527 | /* Dump up to four bytes. */ |
bf47e248 PA |
5528 | char str[4 * 2 + 1]; |
5529 | char *p = str; | |
5530 | int dump = len < 4 ? len : 4; | |
5531 | ||
421490af | 5532 | for (int i = 0; i < dump; i++) |
bf47e248 PA |
5533 | { |
5534 | sprintf (p, "%02x", myaddr[i]); | |
5535 | p += 2; | |
5536 | } | |
5537 | *p = '\0'; | |
5538 | ||
c058728c | 5539 | threads_debug_printf ("Writing %s to 0x%08lx in process %d", |
421490af | 5540 | str, (long) memaddr, current_process ()->pid); |
0d62e5e8 DJ |
5541 | } |
5542 | ||
421490af | 5543 | return proc_xfer_memory (memaddr, nullptr, myaddr, len); |
da6d8c04 | 5544 | } |
2f2893d9 | 5545 | |
2a31c7aa TBA |
5546 | void |
5547 | linux_process_target::look_up_symbols () | |
2f2893d9 | 5548 | { |
0d62e5e8 | 5549 | #ifdef USE_THREAD_DB |
95954743 PA |
5550 | struct process_info *proc = current_process (); |
5551 | ||
fe978cb0 | 5552 | if (proc->priv->thread_db != NULL) |
0d62e5e8 DJ |
5553 | return; |
5554 | ||
9b4c5f87 | 5555 | thread_db_init (); |
0d62e5e8 DJ |
5556 | #endif |
5557 | } | |
5558 | ||
eb497a2a TBA |
5559 | void |
5560 | linux_process_target::request_interrupt () | |
e5379b03 | 5561 | { |
78708b7c PA |
5562 | /* Send a SIGINT to the process group. This acts just like the user |
5563 | typed a ^C on the controlling terminal. */ | |
4c35c4c6 TV |
5564 | int res = ::kill (-signal_pid, SIGINT); |
5565 | if (res == -1) | |
5566 | warning (_("Sending SIGINT to process group of pid %ld failed: %s"), | |
5567 | signal_pid, safe_strerror (errno)); | |
e5379b03 DJ |
5568 | } |
5569 | ||
eac215cc TBA |
5570 | bool |
5571 | linux_process_target::supports_read_auxv () | |
5572 | { | |
5573 | return true; | |
5574 | } | |
5575 | ||
aa691b87 RM |
5576 | /* Copy LEN bytes from inferior's auxiliary vector starting at OFFSET |
5577 | to debugger memory starting at MYADDR. */ | |
5578 | ||
eac215cc | 5579 | int |
43e5fbd8 TJB |
5580 | linux_process_target::read_auxv (int pid, CORE_ADDR offset, |
5581 | unsigned char *myaddr, unsigned int len) | |
aa691b87 RM |
5582 | { |
5583 | char filename[PATH_MAX]; | |
5584 | int fd, n; | |
5585 | ||
6cebaf6e | 5586 | xsnprintf (filename, sizeof filename, "/proc/%d/auxv", pid); |
aa691b87 RM |
5587 | |
5588 | fd = open (filename, O_RDONLY); | |
5589 | if (fd < 0) | |
5590 | return -1; | |
5591 | ||
5592 | if (offset != (CORE_ADDR) 0 | |
5593 | && lseek (fd, (off_t) offset, SEEK_SET) != (off_t) offset) | |
5594 | n = -1; | |
5595 | else | |
5596 | n = read (fd, myaddr, len); | |
5597 | ||
5598 | close (fd); | |
5599 | ||
5600 | return n; | |
5601 | } | |
5602 | ||
7e0bde70 TBA |
5603 | int |
5604 | linux_process_target::insert_point (enum raw_bkpt_type type, CORE_ADDR addr, | |
5605 | int size, raw_breakpoint *bp) | |
e013ee27 | 5606 | { |
c8f4bfdd YQ |
5607 | if (type == raw_bkpt_type_sw) |
5608 | return insert_memory_breakpoint (bp); | |
e013ee27 | 5609 | else |
9db9aa23 TBA |
5610 | return low_insert_point (type, addr, size, bp); |
5611 | } | |
5612 | ||
5613 | int | |
5614 | linux_process_target::low_insert_point (raw_bkpt_type type, CORE_ADDR addr, | |
5615 | int size, raw_breakpoint *bp) | |
5616 | { | |
5617 | /* Unsupported (see target.h). */ | |
5618 | return 1; | |
e013ee27 OF |
5619 | } |
5620 | ||
7e0bde70 TBA |
5621 | int |
5622 | linux_process_target::remove_point (enum raw_bkpt_type type, CORE_ADDR addr, | |
5623 | int size, raw_breakpoint *bp) | |
e013ee27 | 5624 | { |
c8f4bfdd YQ |
5625 | if (type == raw_bkpt_type_sw) |
5626 | return remove_memory_breakpoint (bp); | |
e013ee27 | 5627 | else |
9db9aa23 TBA |
5628 | return low_remove_point (type, addr, size, bp); |
5629 | } | |
5630 | ||
5631 | int | |
5632 | linux_process_target::low_remove_point (raw_bkpt_type type, CORE_ADDR addr, | |
5633 | int size, raw_breakpoint *bp) | |
5634 | { | |
5635 | /* Unsupported (see target.h). */ | |
5636 | return 1; | |
e013ee27 OF |
5637 | } |
5638 | ||
84320c4e | 5639 | /* Implement the stopped_by_sw_breakpoint target_ops |
3e572f71 PA |
5640 | method. */ |
5641 | ||
84320c4e TBA |
5642 | bool |
5643 | linux_process_target::stopped_by_sw_breakpoint () | |
3e572f71 PA |
5644 | { |
5645 | struct lwp_info *lwp = get_thread_lwp (current_thread); | |
5646 | ||
5647 | return (lwp->stop_reason == TARGET_STOPPED_BY_SW_BREAKPOINT); | |
5648 | } | |
5649 | ||
84320c4e | 5650 | /* Implement the supports_stopped_by_sw_breakpoint target_ops |
3e572f71 PA |
5651 | method. */ |
5652 | ||
84320c4e TBA |
5653 | bool |
5654 | linux_process_target::supports_stopped_by_sw_breakpoint () | |
3e572f71 PA |
5655 | { |
5656 | return USE_SIGTRAP_SIGINFO; | |
5657 | } | |
5658 | ||
93fe88b2 | 5659 | /* Implement the stopped_by_hw_breakpoint target_ops |
3e572f71 PA |
5660 | method. */ |
5661 | ||
93fe88b2 TBA |
5662 | bool |
5663 | linux_process_target::stopped_by_hw_breakpoint () | |
3e572f71 PA |
5664 | { |
5665 | struct lwp_info *lwp = get_thread_lwp (current_thread); | |
5666 | ||
5667 | return (lwp->stop_reason == TARGET_STOPPED_BY_HW_BREAKPOINT); | |
5668 | } | |
5669 | ||
93fe88b2 | 5670 | /* Implement the supports_stopped_by_hw_breakpoint target_ops |
3e572f71 PA |
5671 | method. */ |
5672 | ||
93fe88b2 TBA |
5673 | bool |
5674 | linux_process_target::supports_stopped_by_hw_breakpoint () | |
3e572f71 PA |
5675 | { |
5676 | return USE_SIGTRAP_SIGINFO; | |
5677 | } | |
5678 | ||
70b90b91 | 5679 | /* Implement the supports_hardware_single_step target_ops method. */ |
45614f15 | 5680 | |
22aa6223 TBA |
5681 | bool |
5682 | linux_process_target::supports_hardware_single_step () | |
45614f15 | 5683 | { |
b31cdfa6 | 5684 | return true; |
45614f15 YQ |
5685 | } |
5686 | ||
6eeb5c55 TBA |
5687 | bool |
5688 | linux_process_target::stopped_by_watchpoint () | |
e013ee27 | 5689 | { |
0bfdf32f | 5690 | struct lwp_info *lwp = get_thread_lwp (current_thread); |
c3adc08c | 5691 | |
15c66dd6 | 5692 | return lwp->stop_reason == TARGET_STOPPED_BY_WATCHPOINT; |
e013ee27 OF |
5693 | } |
5694 | ||
6eeb5c55 TBA |
5695 | CORE_ADDR |
5696 | linux_process_target::stopped_data_address () | |
e013ee27 | 5697 | { |
0bfdf32f | 5698 | struct lwp_info *lwp = get_thread_lwp (current_thread); |
c3adc08c PA |
5699 | |
5700 | return lwp->stopped_data_address; | |
e013ee27 OF |
5701 | } |
5702 | ||
db0dfaa0 LM |
5703 | /* This is only used for targets that define PT_TEXT_ADDR, |
5704 | PT_DATA_ADDR and PT_TEXT_END_ADDR. If those are not defined, supposedly | |
5705 | the target has different ways of acquiring this information, like | |
5706 | loadmaps. */ | |
52fb6437 | 5707 | |
5203ae1e TBA |
5708 | bool |
5709 | linux_process_target::supports_read_offsets () | |
5710 | { | |
5711 | #ifdef SUPPORTS_READ_OFFSETS | |
5712 | return true; | |
5713 | #else | |
5714 | return false; | |
5715 | #endif | |
5716 | } | |
5717 | ||
52fb6437 NS |
5718 | /* Under uClinux, programs are loaded at non-zero offsets, which we need |
5719 | to tell gdb about. */ | |
5720 | ||
5203ae1e TBA |
5721 | int |
5722 | linux_process_target::read_offsets (CORE_ADDR *text_p, CORE_ADDR *data_p) | |
52fb6437 | 5723 | { |
5203ae1e | 5724 | #ifdef SUPPORTS_READ_OFFSETS |
52fb6437 | 5725 | unsigned long text, text_end, data; |
62828379 | 5726 | int pid = lwpid_of (current_thread); |
52fb6437 NS |
5727 | |
5728 | errno = 0; | |
5729 | ||
b8e1b30e LM |
5730 | text = ptrace (PTRACE_PEEKUSER, pid, (PTRACE_TYPE_ARG3) PT_TEXT_ADDR, |
5731 | (PTRACE_TYPE_ARG4) 0); | |
5732 | text_end = ptrace (PTRACE_PEEKUSER, pid, (PTRACE_TYPE_ARG3) PT_TEXT_END_ADDR, | |
5733 | (PTRACE_TYPE_ARG4) 0); | |
5734 | data = ptrace (PTRACE_PEEKUSER, pid, (PTRACE_TYPE_ARG3) PT_DATA_ADDR, | |
5735 | (PTRACE_TYPE_ARG4) 0); | |
52fb6437 NS |
5736 | |
5737 | if (errno == 0) | |
5738 | { | |
5739 | /* Both text and data offsets produced at compile-time (and so | |
1b3f6016 PA |
5740 | used by gdb) are relative to the beginning of the program, |
5741 | with the data segment immediately following the text segment. | |
5742 | However, the actual runtime layout in memory may put the data | |
5743 | somewhere else, so when we send gdb a data base-address, we | |
5744 | use the real data base address and subtract the compile-time | |
5745 | data base-address from it (which is just the length of the | |
5746 | text segment). BSS immediately follows data in both | |
5747 | cases. */ | |
52fb6437 NS |
5748 | *text_p = text; |
5749 | *data_p = data - (text_end - text); | |
1b3f6016 | 5750 | |
52fb6437 NS |
5751 | return 1; |
5752 | } | |
5203ae1e TBA |
5753 | return 0; |
5754 | #else | |
5755 | gdb_assert_not_reached ("target op read_offsets not supported"); | |
52fb6437 | 5756 | #endif |
5203ae1e | 5757 | } |
52fb6437 | 5758 | |
6e3fd7e9 TBA |
5759 | bool |
5760 | linux_process_target::supports_get_tls_address () | |
5761 | { | |
5762 | #ifdef USE_THREAD_DB | |
5763 | return true; | |
5764 | #else | |
5765 | return false; | |
5766 | #endif | |
5767 | } | |
5768 | ||
5769 | int | |
5770 | linux_process_target::get_tls_address (thread_info *thread, | |
5771 | CORE_ADDR offset, | |
5772 | CORE_ADDR load_module, | |
5773 | CORE_ADDR *address) | |
5774 | { | |
5775 | #ifdef USE_THREAD_DB | |
5776 | return thread_db_get_tls_address (thread, offset, load_module, address); | |
5777 | #else | |
5778 | return -1; | |
5779 | #endif | |
5780 | } | |
5781 | ||
2d0795ee TBA |
5782 | bool |
5783 | linux_process_target::supports_qxfer_osdata () | |
5784 | { | |
5785 | return true; | |
5786 | } | |
5787 | ||
5788 | int | |
5789 | linux_process_target::qxfer_osdata (const char *annex, | |
5790 | unsigned char *readbuf, | |
5791 | unsigned const char *writebuf, | |
5792 | CORE_ADDR offset, int len) | |
07e059b5 | 5793 | { |
d26e3629 | 5794 | return linux_common_xfer_osdata (annex, readbuf, offset, len); |
07e059b5 VP |
5795 | } |
5796 | ||
cb63de7c TBA |
5797 | void |
5798 | linux_process_target::siginfo_fixup (siginfo_t *siginfo, | |
5799 | gdb_byte *inf_siginfo, int direction) | |
d0722149 | 5800 | { |
cb63de7c | 5801 | bool done = low_siginfo_fixup (siginfo, inf_siginfo, direction); |
d0722149 DE |
5802 | |
5803 | /* If there was no callback, or the callback didn't do anything, | |
5804 | then just do a straight memcpy. */ | |
5805 | if (!done) | |
5806 | { | |
5807 | if (direction == 1) | |
a5362b9a | 5808 | memcpy (siginfo, inf_siginfo, sizeof (siginfo_t)); |
d0722149 | 5809 | else |
a5362b9a | 5810 | memcpy (inf_siginfo, siginfo, sizeof (siginfo_t)); |
d0722149 DE |
5811 | } |
5812 | } | |
5813 | ||
cb63de7c TBA |
5814 | bool |
5815 | linux_process_target::low_siginfo_fixup (siginfo_t *native, gdb_byte *inf, | |
5816 | int direction) | |
5817 | { | |
5818 | return false; | |
5819 | } | |
5820 | ||
d7abedf7 TBA |
5821 | bool |
5822 | linux_process_target::supports_qxfer_siginfo () | |
5823 | { | |
5824 | return true; | |
5825 | } | |
5826 | ||
5827 | int | |
5828 | linux_process_target::qxfer_siginfo (const char *annex, | |
5829 | unsigned char *readbuf, | |
5830 | unsigned const char *writebuf, | |
5831 | CORE_ADDR offset, int len) | |
4aa995e1 | 5832 | { |
d0722149 | 5833 | int pid; |
a5362b9a | 5834 | siginfo_t siginfo; |
8adce034 | 5835 | gdb_byte inf_siginfo[sizeof (siginfo_t)]; |
4aa995e1 | 5836 | |
0bfdf32f | 5837 | if (current_thread == NULL) |
4aa995e1 PA |
5838 | return -1; |
5839 | ||
0bfdf32f | 5840 | pid = lwpid_of (current_thread); |
4aa995e1 | 5841 | |
c058728c SM |
5842 | threads_debug_printf ("%s siginfo for lwp %d.", |
5843 | readbuf != NULL ? "Reading" : "Writing", | |
5844 | pid); | |
4aa995e1 | 5845 | |
0adea5f7 | 5846 | if (offset >= sizeof (siginfo)) |
4aa995e1 PA |
5847 | return -1; |
5848 | ||
b8e1b30e | 5849 | if (ptrace (PTRACE_GETSIGINFO, pid, (PTRACE_TYPE_ARG3) 0, &siginfo) != 0) |
4aa995e1 PA |
5850 | return -1; |
5851 | ||
d0722149 DE |
5852 | /* When GDBSERVER is built as a 64-bit application, ptrace writes into |
5853 | SIGINFO an object with 64-bit layout. Since debugging a 32-bit | |
5854 | inferior with a 64-bit GDBSERVER should look the same as debugging it | |
5855 | with a 32-bit GDBSERVER, we need to convert it. */ | |
5856 | siginfo_fixup (&siginfo, inf_siginfo, 0); | |
5857 | ||
4aa995e1 PA |
5858 | if (offset + len > sizeof (siginfo)) |
5859 | len = sizeof (siginfo) - offset; | |
5860 | ||
5861 | if (readbuf != NULL) | |
d0722149 | 5862 | memcpy (readbuf, inf_siginfo + offset, len); |
4aa995e1 PA |
5863 | else |
5864 | { | |
d0722149 DE |
5865 | memcpy (inf_siginfo + offset, writebuf, len); |
5866 | ||
5867 | /* Convert back to ptrace layout before flushing it out. */ | |
5868 | siginfo_fixup (&siginfo, inf_siginfo, 1); | |
5869 | ||
b8e1b30e | 5870 | if (ptrace (PTRACE_SETSIGINFO, pid, (PTRACE_TYPE_ARG3) 0, &siginfo) != 0) |
4aa995e1 PA |
5871 | return -1; |
5872 | } | |
5873 | ||
5874 | return len; | |
5875 | } | |
5876 | ||
bd99dc85 PA |
5877 | /* SIGCHLD handler that serves two purposes: In non-stop/async mode, |
5878 | so we notice when children change state; as the handler for the | |
5879 | sigsuspend in my_waitpid. */ | |
5880 | ||
5881 | static void | |
5882 | sigchld_handler (int signo) | |
5883 | { | |
5884 | int old_errno = errno; | |
5885 | ||
5886 | if (debug_threads) | |
e581f2b4 PA |
5887 | { |
5888 | do | |
5889 | { | |
a7e559cc AH |
5890 | /* Use the async signal safe debug function. */ |
5891 | if (debug_write ("sigchld_handler\n", | |
5892 | sizeof ("sigchld_handler\n") - 1) < 0) | |
e581f2b4 PA |
5893 | break; /* just ignore */ |
5894 | } while (0); | |
5895 | } | |
bd99dc85 PA |
5896 | |
5897 | if (target_is_async_p ()) | |
5898 | async_file_mark (); /* trigger a linux_wait */ | |
5899 | ||
5900 | errno = old_errno; | |
5901 | } | |
5902 | ||
0dc587d4 TBA |
5903 | bool |
5904 | linux_process_target::supports_non_stop () | |
bd99dc85 | 5905 | { |
0dc587d4 | 5906 | return true; |
bd99dc85 PA |
5907 | } |
5908 | ||
0dc587d4 TBA |
5909 | bool |
5910 | linux_process_target::async (bool enable) | |
bd99dc85 | 5911 | { |
0dc587d4 | 5912 | bool previous = target_is_async_p (); |
bd99dc85 | 5913 | |
c058728c SM |
5914 | threads_debug_printf ("async (%d), previous=%d", |
5915 | enable, previous); | |
8336d594 | 5916 | |
bd99dc85 PA |
5917 | if (previous != enable) |
5918 | { | |
5919 | sigset_t mask; | |
5920 | sigemptyset (&mask); | |
5921 | sigaddset (&mask, SIGCHLD); | |
5922 | ||
21987b9c | 5923 | gdb_sigmask (SIG_BLOCK, &mask, NULL); |
bd99dc85 PA |
5924 | |
5925 | if (enable) | |
5926 | { | |
8674f082 | 5927 | if (!linux_event_pipe.open_pipe ()) |
aa96c426 | 5928 | { |
21987b9c | 5929 | gdb_sigmask (SIG_UNBLOCK, &mask, NULL); |
aa96c426 GB |
5930 | |
5931 | warning ("creating event pipe failed."); | |
5932 | return previous; | |
5933 | } | |
bd99dc85 | 5934 | |
bd99dc85 | 5935 | /* Register the event loop handler. */ |
cdc8e9b2 | 5936 | add_file_handler (linux_event_pipe.event_fd (), |
2554f6f5 SM |
5937 | handle_target_event, NULL, |
5938 | "linux-low"); | |
bd99dc85 PA |
5939 | |
5940 | /* Always trigger a linux_wait. */ | |
5941 | async_file_mark (); | |
5942 | } | |
5943 | else | |
5944 | { | |
cdc8e9b2 | 5945 | delete_file_handler (linux_event_pipe.event_fd ()); |
bd99dc85 | 5946 | |
8674f082 | 5947 | linux_event_pipe.close_pipe (); |
bd99dc85 PA |
5948 | } |
5949 | ||
21987b9c | 5950 | gdb_sigmask (SIG_UNBLOCK, &mask, NULL); |
bd99dc85 PA |
5951 | } |
5952 | ||
5953 | return previous; | |
5954 | } | |
5955 | ||
0dc587d4 TBA |
5956 | int |
5957 | linux_process_target::start_non_stop (bool nonstop) | |
bd99dc85 PA |
5958 | { |
5959 | /* Register or unregister from event-loop accordingly. */ | |
0dc587d4 | 5960 | target_async (nonstop); |
aa96c426 | 5961 | |
0dc587d4 | 5962 | if (target_is_async_p () != (nonstop != false)) |
aa96c426 GB |
5963 | return -1; |
5964 | ||
bd99dc85 PA |
5965 | return 0; |
5966 | } | |
5967 | ||
652aef77 TBA |
5968 | bool |
5969 | linux_process_target::supports_multi_process () | |
cf8fd78b | 5970 | { |
652aef77 | 5971 | return true; |
cf8fd78b PA |
5972 | } |
5973 | ||
89245bc0 DB |
5974 | /* Check if fork events are supported. */ |
5975 | ||
9690a72a TBA |
5976 | bool |
5977 | linux_process_target::supports_fork_events () | |
89245bc0 | 5978 | { |
a2885186 | 5979 | return true; |
89245bc0 DB |
5980 | } |
5981 | ||
5982 | /* Check if vfork events are supported. */ | |
5983 | ||
9690a72a TBA |
5984 | bool |
5985 | linux_process_target::supports_vfork_events () | |
89245bc0 | 5986 | { |
a2885186 | 5987 | return true; |
89245bc0 DB |
5988 | } |
5989 | ||
393a6b59 PA |
5990 | /* Return the set of supported thread options. */ |
5991 | ||
5992 | gdb_thread_options | |
5993 | linux_process_target::supported_thread_options () | |
5994 | { | |
48989498 | 5995 | return GDB_THREAD_OPTION_CLONE | GDB_THREAD_OPTION_EXIT; |
393a6b59 PA |
5996 | } |
5997 | ||
94585166 DB |
5998 | /* Check if exec events are supported. */ |
5999 | ||
9690a72a TBA |
6000 | bool |
6001 | linux_process_target::supports_exec_events () | |
94585166 | 6002 | { |
a2885186 | 6003 | return true; |
94585166 DB |
6004 | } |
6005 | ||
de0d863e DB |
6006 | /* Target hook for 'handle_new_gdb_connection'. Causes a reset of the |
6007 | ptrace flags for all inferiors. This is in case the new GDB connection | |
6008 | doesn't support the same set of events that the previous one did. */ | |
6009 | ||
fb00dfce TBA |
6010 | void |
6011 | linux_process_target::handle_new_gdb_connection () | |
de0d863e | 6012 | { |
de0d863e | 6013 | /* Request that all the lwps reset their ptrace options. */ |
bbf550d5 SM |
6014 | for_each_thread ([] (thread_info *thread) |
6015 | { | |
6016 | struct lwp_info *lwp = get_thread_lwp (thread); | |
6017 | ||
6018 | if (!lwp->stopped) | |
6019 | { | |
6020 | /* Stop the lwp so we can modify its ptrace options. */ | |
6021 | lwp->must_set_ptrace_flags = 1; | |
6022 | linux_stop_lwp (lwp); | |
6023 | } | |
6024 | else | |
6025 | { | |
6026 | /* Already stopped; go ahead and set the ptrace options. */ | |
6027 | struct process_info *proc = find_process_pid (pid_of (thread)); | |
6028 | int options = linux_low_ptrace_options (proc->attached); | |
6029 | ||
6030 | linux_enable_event_reporting (lwpid_of (thread), options); | |
6031 | lwp->must_set_ptrace_flags = 0; | |
6032 | } | |
6033 | }); | |
de0d863e DB |
6034 | } |
6035 | ||
55cf3021 TBA |
6036 | int |
6037 | linux_process_target::handle_monitor_command (char *mon) | |
6038 | { | |
6039 | #ifdef USE_THREAD_DB | |
6040 | return thread_db_handle_monitor_command (mon); | |
6041 | #else | |
6042 | return 0; | |
6043 | #endif | |
6044 | } | |
6045 | ||
95a45fc1 TBA |
6046 | int |
6047 | linux_process_target::core_of_thread (ptid_t ptid) | |
6048 | { | |
6049 | return linux_common_core_of_thread (ptid); | |
6050 | } | |
6051 | ||
c756403b TBA |
6052 | bool |
6053 | linux_process_target::supports_disable_randomization () | |
03583c20 | 6054 | { |
c756403b | 6055 | return true; |
03583c20 | 6056 | } |
efcbbd14 | 6057 | |
c0245cb9 TBA |
6058 | bool |
6059 | linux_process_target::supports_agent () | |
d1feda86 | 6060 | { |
c0245cb9 | 6061 | return true; |
d1feda86 YQ |
6062 | } |
6063 | ||
2526e0cd TBA |
6064 | bool |
6065 | linux_process_target::supports_range_stepping () | |
c2d6af84 | 6066 | { |
7582c77c | 6067 | if (supports_software_single_step ()) |
2526e0cd | 6068 | return true; |
c2d6af84 | 6069 | |
9cfd8715 TBA |
6070 | return low_supports_range_stepping (); |
6071 | } | |
6072 | ||
6073 | bool | |
6074 | linux_process_target::low_supports_range_stepping () | |
6075 | { | |
6076 | return false; | |
c2d6af84 PA |
6077 | } |
6078 | ||
8247b823 TBA |
6079 | bool |
6080 | linux_process_target::supports_pid_to_exec_file () | |
6081 | { | |
6082 | return true; | |
6083 | } | |
6084 | ||
04977957 | 6085 | const char * |
8247b823 TBA |
6086 | linux_process_target::pid_to_exec_file (int pid) |
6087 | { | |
6088 | return linux_proc_pid_to_exec_file (pid); | |
6089 | } | |
6090 | ||
c9b7b804 TBA |
6091 | bool |
6092 | linux_process_target::supports_multifs () | |
6093 | { | |
6094 | return true; | |
6095 | } | |
6096 | ||
6097 | int | |
6098 | linux_process_target::multifs_open (int pid, const char *filename, | |
6099 | int flags, mode_t mode) | |
6100 | { | |
6101 | return linux_mntns_open_cloexec (pid, filename, flags, mode); | |
6102 | } | |
6103 | ||
6104 | int | |
6105 | linux_process_target::multifs_unlink (int pid, const char *filename) | |
6106 | { | |
6107 | return linux_mntns_unlink (pid, filename); | |
6108 | } | |
6109 | ||
6110 | ssize_t | |
6111 | linux_process_target::multifs_readlink (int pid, const char *filename, | |
6112 | char *buf, size_t bufsiz) | |
6113 | { | |
6114 | return linux_mntns_readlink (pid, filename, buf, bufsiz); | |
6115 | } | |
6116 | ||
723b724b | 6117 | #if defined PT_GETDSBT || defined PTRACE_GETFDPIC |
78d85199 YQ |
6118 | struct target_loadseg |
6119 | { | |
6120 | /* Core address to which the segment is mapped. */ | |
6121 | Elf32_Addr addr; | |
6122 | /* VMA recorded in the program header. */ | |
6123 | Elf32_Addr p_vaddr; | |
6124 | /* Size of this segment in memory. */ | |
6125 | Elf32_Word p_memsz; | |
6126 | }; | |
6127 | ||
723b724b | 6128 | # if defined PT_GETDSBT |
78d85199 YQ |
6129 | struct target_loadmap |
6130 | { | |
6131 | /* Protocol version number, must be zero. */ | |
6132 | Elf32_Word version; | |
6133 | /* Pointer to the DSBT table, its size, and the DSBT index. */ | |
6134 | unsigned *dsbt_table; | |
6135 | unsigned dsbt_size, dsbt_index; | |
6136 | /* Number of segments in this map. */ | |
6137 | Elf32_Word nsegs; | |
6138 | /* The actual memory map. */ | |
6139 | struct target_loadseg segs[/*nsegs*/]; | |
6140 | }; | |
723b724b MF |
6141 | # define LINUX_LOADMAP PT_GETDSBT |
6142 | # define LINUX_LOADMAP_EXEC PTRACE_GETDSBT_EXEC | |
6143 | # define LINUX_LOADMAP_INTERP PTRACE_GETDSBT_INTERP | |
6144 | # else | |
6145 | struct target_loadmap | |
6146 | { | |
6147 | /* Protocol version number, must be zero. */ | |
6148 | Elf32_Half version; | |
6149 | /* Number of segments in this map. */ | |
6150 | Elf32_Half nsegs; | |
6151 | /* The actual memory map. */ | |
6152 | struct target_loadseg segs[/*nsegs*/]; | |
6153 | }; | |
6154 | # define LINUX_LOADMAP PTRACE_GETFDPIC | |
6155 | # define LINUX_LOADMAP_EXEC PTRACE_GETFDPIC_EXEC | |
6156 | # define LINUX_LOADMAP_INTERP PTRACE_GETFDPIC_INTERP | |
6157 | # endif | |
78d85199 | 6158 | |
9da41fda TBA |
6159 | bool |
6160 | linux_process_target::supports_read_loadmap () | |
6161 | { | |
6162 | return true; | |
6163 | } | |
6164 | ||
6165 | int | |
6166 | linux_process_target::read_loadmap (const char *annex, CORE_ADDR offset, | |
6167 | unsigned char *myaddr, unsigned int len) | |
78d85199 | 6168 | { |
0bfdf32f | 6169 | int pid = lwpid_of (current_thread); |
78d85199 YQ |
6170 | int addr = -1; |
6171 | struct target_loadmap *data = NULL; | |
6172 | unsigned int actual_length, copy_length; | |
6173 | ||
6174 | if (strcmp (annex, "exec") == 0) | |
723b724b | 6175 | addr = (int) LINUX_LOADMAP_EXEC; |
78d85199 | 6176 | else if (strcmp (annex, "interp") == 0) |
723b724b | 6177 | addr = (int) LINUX_LOADMAP_INTERP; |
78d85199 YQ |
6178 | else |
6179 | return -1; | |
6180 | ||
723b724b | 6181 | if (ptrace (LINUX_LOADMAP, pid, addr, &data) != 0) |
78d85199 YQ |
6182 | return -1; |
6183 | ||
6184 | if (data == NULL) | |
6185 | return -1; | |
6186 | ||
6187 | actual_length = sizeof (struct target_loadmap) | |
6188 | + sizeof (struct target_loadseg) * data->nsegs; | |
6189 | ||
6190 | if (offset < 0 || offset > actual_length) | |
6191 | return -1; | |
6192 | ||
6193 | copy_length = actual_length - offset < len ? actual_length - offset : len; | |
6194 | memcpy (myaddr, (char *) data + offset, copy_length); | |
6195 | return copy_length; | |
6196 | } | |
723b724b | 6197 | #endif /* defined PT_GETDSBT || defined PTRACE_GETFDPIC */ |
78d85199 | 6198 | |
bc8d3ae4 TBA |
6199 | bool |
6200 | linux_process_target::supports_catch_syscall () | |
82075af2 | 6201 | { |
a2885186 | 6202 | return low_supports_catch_syscall (); |
82075af2 JS |
6203 | } |
6204 | ||
9eedd27d TBA |
6205 | bool |
6206 | linux_process_target::low_supports_catch_syscall () | |
6207 | { | |
6208 | return false; | |
6209 | } | |
6210 | ||
770d8f6a TBA |
6211 | CORE_ADDR |
6212 | linux_process_target::read_pc (regcache *regcache) | |
219f2f23 | 6213 | { |
bf9ae9d8 | 6214 | if (!low_supports_breakpoints ()) |
219f2f23 PA |
6215 | return 0; |
6216 | ||
bf9ae9d8 | 6217 | return low_get_pc (regcache); |
219f2f23 PA |
6218 | } |
6219 | ||
770d8f6a TBA |
6220 | void |
6221 | linux_process_target::write_pc (regcache *regcache, CORE_ADDR pc) | |
219f2f23 | 6222 | { |
bf9ae9d8 | 6223 | gdb_assert (low_supports_breakpoints ()); |
219f2f23 | 6224 | |
bf9ae9d8 | 6225 | low_set_pc (regcache, pc); |
219f2f23 PA |
6226 | } |
6227 | ||
68119632 TBA |
6228 | bool |
6229 | linux_process_target::supports_thread_stopped () | |
6230 | { | |
6231 | return true; | |
6232 | } | |
6233 | ||
6234 | bool | |
6235 | linux_process_target::thread_stopped (thread_info *thread) | |
8336d594 PA |
6236 | { |
6237 | return get_thread_lwp (thread)->stopped; | |
6238 | } | |
6239 | ||
ef980d65 PA |
6240 | bool |
6241 | linux_process_target::any_resumed () | |
6242 | { | |
6243 | bool any_resumed; | |
6244 | ||
6245 | auto status_pending_p_any = [&] (thread_info *thread) | |
6246 | { | |
6247 | return status_pending_p_callback (thread, minus_one_ptid); | |
6248 | }; | |
6249 | ||
6250 | auto not_stopped = [&] (thread_info *thread) | |
6251 | { | |
6252 | return not_stopped_callback (thread, minus_one_ptid); | |
6253 | }; | |
6254 | ||
6255 | /* Find a resumed LWP, if any. */ | |
6256 | if (find_thread (status_pending_p_any) != NULL) | |
6257 | any_resumed = 1; | |
6258 | else if (find_thread (not_stopped) != NULL) | |
6259 | any_resumed = 1; | |
6260 | else | |
6261 | any_resumed = 0; | |
6262 | ||
6263 | return any_resumed; | |
6264 | } | |
6265 | ||
8336d594 PA |
6266 | /* This exposes stop-all-threads functionality to other modules. */ |
6267 | ||
29e8dc09 TBA |
6268 | void |
6269 | linux_process_target::pause_all (bool freeze) | |
8336d594 | 6270 | { |
7984d532 PA |
6271 | stop_all_lwps (freeze, NULL); |
6272 | } | |
6273 | ||
6274 | /* This exposes unstop-all-threads functionality to other gdbserver | |
6275 | modules. */ | |
6276 | ||
29e8dc09 TBA |
6277 | void |
6278 | linux_process_target::unpause_all (bool unfreeze) | |
7984d532 PA |
6279 | { |
6280 | unstop_all_lwps (unfreeze, NULL); | |
8336d594 PA |
6281 | } |
6282 | ||
2268b414 JK |
6283 | /* Extract &phdr and num_phdr in the inferior. Return 0 on success. */ |
6284 | ||
6285 | static int | |
6286 | get_phdr_phnum_from_proc_auxv (const int pid, const int is_elf64, | |
6287 | CORE_ADDR *phdr_memaddr, int *num_phdr) | |
6288 | { | |
6289 | char filename[PATH_MAX]; | |
6290 | int fd; | |
6291 | const int auxv_size = is_elf64 | |
6292 | ? sizeof (Elf64_auxv_t) : sizeof (Elf32_auxv_t); | |
6293 | char buf[sizeof (Elf64_auxv_t)]; /* The larger of the two. */ | |
6294 | ||
6295 | xsnprintf (filename, sizeof filename, "/proc/%d/auxv", pid); | |
6296 | ||
6297 | fd = open (filename, O_RDONLY); | |
6298 | if (fd < 0) | |
6299 | return 1; | |
6300 | ||
6301 | *phdr_memaddr = 0; | |
6302 | *num_phdr = 0; | |
6303 | while (read (fd, buf, auxv_size) == auxv_size | |
6304 | && (*phdr_memaddr == 0 || *num_phdr == 0)) | |
6305 | { | |
6306 | if (is_elf64) | |
6307 | { | |
6308 | Elf64_auxv_t *const aux = (Elf64_auxv_t *) buf; | |
6309 | ||
6310 | switch (aux->a_type) | |
6311 | { | |
6312 | case AT_PHDR: | |
6313 | *phdr_memaddr = aux->a_un.a_val; | |
6314 | break; | |
6315 | case AT_PHNUM: | |
6316 | *num_phdr = aux->a_un.a_val; | |
6317 | break; | |
6318 | } | |
6319 | } | |
6320 | else | |
6321 | { | |
6322 | Elf32_auxv_t *const aux = (Elf32_auxv_t *) buf; | |
6323 | ||
6324 | switch (aux->a_type) | |
6325 | { | |
6326 | case AT_PHDR: | |
6327 | *phdr_memaddr = aux->a_un.a_val; | |
6328 | break; | |
6329 | case AT_PHNUM: | |
6330 | *num_phdr = aux->a_un.a_val; | |
6331 | break; | |
6332 | } | |
6333 | } | |
6334 | } | |
6335 | ||
6336 | close (fd); | |
6337 | ||
6338 | if (*phdr_memaddr == 0 || *num_phdr == 0) | |
6339 | { | |
6340 | warning ("Unexpected missing AT_PHDR and/or AT_PHNUM: " | |
6341 | "phdr_memaddr = %ld, phdr_num = %d", | |
6342 | (long) *phdr_memaddr, *num_phdr); | |
6343 | return 2; | |
6344 | } | |
6345 | ||
6346 | return 0; | |
6347 | } | |
6348 | ||
6349 | /* Return &_DYNAMIC (via PT_DYNAMIC) in the inferior, or 0 if not present. */ | |
6350 | ||
6351 | static CORE_ADDR | |
6352 | get_dynamic (const int pid, const int is_elf64) | |
6353 | { | |
6354 | CORE_ADDR phdr_memaddr, relocation; | |
db1ff28b | 6355 | int num_phdr, i; |
2268b414 | 6356 | unsigned char *phdr_buf; |
db1ff28b | 6357 | const int phdr_size = is_elf64 ? sizeof (Elf64_Phdr) : sizeof (Elf32_Phdr); |
2268b414 JK |
6358 | |
6359 | if (get_phdr_phnum_from_proc_auxv (pid, is_elf64, &phdr_memaddr, &num_phdr)) | |
6360 | return 0; | |
6361 | ||
6362 | gdb_assert (num_phdr < 100); /* Basic sanity check. */ | |
224c3ddb | 6363 | phdr_buf = (unsigned char *) alloca (num_phdr * phdr_size); |
2268b414 JK |
6364 | |
6365 | if (linux_read_memory (phdr_memaddr, phdr_buf, num_phdr * phdr_size)) | |
6366 | return 0; | |
6367 | ||
6368 | /* Compute relocation: it is expected to be 0 for "regular" executables, | |
6369 | non-zero for PIE ones. */ | |
6370 | relocation = -1; | |
db1ff28b JK |
6371 | for (i = 0; relocation == -1 && i < num_phdr; i++) |
6372 | if (is_elf64) | |
6373 | { | |
6374 | Elf64_Phdr *const p = (Elf64_Phdr *) (phdr_buf + i * phdr_size); | |
6375 | ||
6376 | if (p->p_type == PT_PHDR) | |
6377 | relocation = phdr_memaddr - p->p_vaddr; | |
6378 | } | |
6379 | else | |
6380 | { | |
6381 | Elf32_Phdr *const p = (Elf32_Phdr *) (phdr_buf + i * phdr_size); | |
6382 | ||
6383 | if (p->p_type == PT_PHDR) | |
6384 | relocation = phdr_memaddr - p->p_vaddr; | |
6385 | } | |
6386 | ||
2268b414 JK |
6387 | if (relocation == -1) |
6388 | { | |
e237a7e2 JK |
6389 | /* PT_PHDR is optional, but necessary for PIE in general. Fortunately |
6390 | any real world executables, including PIE executables, have always | |
6391 | PT_PHDR present. PT_PHDR is not present in some shared libraries or | |
6392 | in fpc (Free Pascal 2.4) binaries but neither of those have a need for | |
6393 | or present DT_DEBUG anyway (fpc binaries are statically linked). | |
6394 | ||
6395 | Therefore if there exists DT_DEBUG there is always also PT_PHDR. | |
6396 | ||
6397 | GDB could find RELOCATION also from AT_ENTRY - e_entry. */ | |
6398 | ||
2268b414 JK |
6399 | return 0; |
6400 | } | |
6401 | ||
db1ff28b JK |
6402 | for (i = 0; i < num_phdr; i++) |
6403 | { | |
6404 | if (is_elf64) | |
6405 | { | |
6406 | Elf64_Phdr *const p = (Elf64_Phdr *) (phdr_buf + i * phdr_size); | |
6407 | ||
6408 | if (p->p_type == PT_DYNAMIC) | |
6409 | return p->p_vaddr + relocation; | |
6410 | } | |
6411 | else | |
6412 | { | |
6413 | Elf32_Phdr *const p = (Elf32_Phdr *) (phdr_buf + i * phdr_size); | |
2268b414 | 6414 | |
db1ff28b JK |
6415 | if (p->p_type == PT_DYNAMIC) |
6416 | return p->p_vaddr + relocation; | |
6417 | } | |
6418 | } | |
2268b414 JK |
6419 | |
6420 | return 0; | |
6421 | } | |
6422 | ||
6423 | /* Return &_r_debug in the inferior, or -1 if not present. Return value | |
367ba2c2 MR |
6424 | can be 0 if the inferior does not yet have the library list initialized. |
6425 | We look for DT_MIPS_RLD_MAP first. MIPS executables use this instead of | |
6426 | DT_DEBUG, although they sometimes contain an unused DT_DEBUG entry too. */ | |
2268b414 JK |
6427 | |
6428 | static CORE_ADDR | |
6429 | get_r_debug (const int pid, const int is_elf64) | |
6430 | { | |
6431 | CORE_ADDR dynamic_memaddr; | |
6432 | const int dyn_size = is_elf64 ? sizeof (Elf64_Dyn) : sizeof (Elf32_Dyn); | |
6433 | unsigned char buf[sizeof (Elf64_Dyn)]; /* The larger of the two. */ | |
367ba2c2 | 6434 | CORE_ADDR map = -1; |
2268b414 JK |
6435 | |
6436 | dynamic_memaddr = get_dynamic (pid, is_elf64); | |
6437 | if (dynamic_memaddr == 0) | |
367ba2c2 | 6438 | return map; |
2268b414 JK |
6439 | |
6440 | while (linux_read_memory (dynamic_memaddr, buf, dyn_size) == 0) | |
6441 | { | |
6442 | if (is_elf64) | |
6443 | { | |
6444 | Elf64_Dyn *const dyn = (Elf64_Dyn *) buf; | |
a738da3a | 6445 | #if defined DT_MIPS_RLD_MAP || defined DT_MIPS_RLD_MAP_REL |
367ba2c2 MR |
6446 | union |
6447 | { | |
6448 | Elf64_Xword map; | |
6449 | unsigned char buf[sizeof (Elf64_Xword)]; | |
6450 | } | |
6451 | rld_map; | |
a738da3a MF |
6452 | #endif |
6453 | #ifdef DT_MIPS_RLD_MAP | |
367ba2c2 MR |
6454 | if (dyn->d_tag == DT_MIPS_RLD_MAP) |
6455 | { | |
6456 | if (linux_read_memory (dyn->d_un.d_val, | |
6457 | rld_map.buf, sizeof (rld_map.buf)) == 0) | |
6458 | return rld_map.map; | |
6459 | else | |
6460 | break; | |
6461 | } | |
75f62ce7 | 6462 | #endif /* DT_MIPS_RLD_MAP */ |
a738da3a MF |
6463 | #ifdef DT_MIPS_RLD_MAP_REL |
6464 | if (dyn->d_tag == DT_MIPS_RLD_MAP_REL) | |
6465 | { | |
6466 | if (linux_read_memory (dyn->d_un.d_val + dynamic_memaddr, | |
6467 | rld_map.buf, sizeof (rld_map.buf)) == 0) | |
6468 | return rld_map.map; | |
6469 | else | |
6470 | break; | |
6471 | } | |
6472 | #endif /* DT_MIPS_RLD_MAP_REL */ | |
2268b414 | 6473 | |
367ba2c2 MR |
6474 | if (dyn->d_tag == DT_DEBUG && map == -1) |
6475 | map = dyn->d_un.d_val; | |
2268b414 JK |
6476 | |
6477 | if (dyn->d_tag == DT_NULL) | |
6478 | break; | |
6479 | } | |
6480 | else | |
6481 | { | |
6482 | Elf32_Dyn *const dyn = (Elf32_Dyn *) buf; | |
a738da3a | 6483 | #if defined DT_MIPS_RLD_MAP || defined DT_MIPS_RLD_MAP_REL |
367ba2c2 MR |
6484 | union |
6485 | { | |
6486 | Elf32_Word map; | |
6487 | unsigned char buf[sizeof (Elf32_Word)]; | |
6488 | } | |
6489 | rld_map; | |
a738da3a MF |
6490 | #endif |
6491 | #ifdef DT_MIPS_RLD_MAP | |
367ba2c2 MR |
6492 | if (dyn->d_tag == DT_MIPS_RLD_MAP) |
6493 | { | |
6494 | if (linux_read_memory (dyn->d_un.d_val, | |
6495 | rld_map.buf, sizeof (rld_map.buf)) == 0) | |
6496 | return rld_map.map; | |
6497 | else | |
6498 | break; | |
6499 | } | |
75f62ce7 | 6500 | #endif /* DT_MIPS_RLD_MAP */ |
a738da3a MF |
6501 | #ifdef DT_MIPS_RLD_MAP_REL |
6502 | if (dyn->d_tag == DT_MIPS_RLD_MAP_REL) | |
6503 | { | |
6504 | if (linux_read_memory (dyn->d_un.d_val + dynamic_memaddr, | |
6505 | rld_map.buf, sizeof (rld_map.buf)) == 0) | |
6506 | return rld_map.map; | |
6507 | else | |
6508 | break; | |
6509 | } | |
6510 | #endif /* DT_MIPS_RLD_MAP_REL */ | |
2268b414 | 6511 | |
367ba2c2 MR |
6512 | if (dyn->d_tag == DT_DEBUG && map == -1) |
6513 | map = dyn->d_un.d_val; | |
2268b414 JK |
6514 | |
6515 | if (dyn->d_tag == DT_NULL) | |
6516 | break; | |
6517 | } | |
6518 | ||
6519 | dynamic_memaddr += dyn_size; | |
6520 | } | |
6521 | ||
367ba2c2 | 6522 | return map; |
2268b414 JK |
6523 | } |
6524 | ||
6525 | /* Read one pointer from MEMADDR in the inferior. */ | |
6526 | ||
6527 | static int | |
6528 | read_one_ptr (CORE_ADDR memaddr, CORE_ADDR *ptr, int ptr_size) | |
6529 | { | |
485f1ee4 PA |
6530 | int ret; |
6531 | ||
6532 | /* Go through a union so this works on either big or little endian | |
6533 | hosts, when the inferior's pointer size is smaller than the size | |
6534 | of CORE_ADDR. It is assumed the inferior's endianness is the | |
6535 | same of the superior's. */ | |
6536 | union | |
6537 | { | |
6538 | CORE_ADDR core_addr; | |
6539 | unsigned int ui; | |
6540 | unsigned char uc; | |
6541 | } addr; | |
6542 | ||
6543 | ret = linux_read_memory (memaddr, &addr.uc, ptr_size); | |
6544 | if (ret == 0) | |
6545 | { | |
6546 | if (ptr_size == sizeof (CORE_ADDR)) | |
6547 | *ptr = addr.core_addr; | |
6548 | else if (ptr_size == sizeof (unsigned int)) | |
6549 | *ptr = addr.ui; | |
6550 | else | |
6551 | gdb_assert_not_reached ("unhandled pointer size"); | |
6552 | } | |
6553 | return ret; | |
2268b414 JK |
6554 | } |
6555 | ||
974387bb TBA |
6556 | bool |
6557 | linux_process_target::supports_qxfer_libraries_svr4 () | |
6558 | { | |
6559 | return true; | |
6560 | } | |
6561 | ||
2268b414 JK |
6562 | struct link_map_offsets |
6563 | { | |
6564 | /* Offset and size of r_debug.r_version. */ | |
6565 | int r_version_offset; | |
6566 | ||
6567 | /* Offset and size of r_debug.r_map. */ | |
6568 | int r_map_offset; | |
6569 | ||
8d56636a MM |
6570 | /* Offset of r_debug_extended.r_next. */ |
6571 | int r_next_offset; | |
6572 | ||
2268b414 JK |
6573 | /* Offset to l_addr field in struct link_map. */ |
6574 | int l_addr_offset; | |
6575 | ||
6576 | /* Offset to l_name field in struct link_map. */ | |
6577 | int l_name_offset; | |
6578 | ||
6579 | /* Offset to l_ld field in struct link_map. */ | |
6580 | int l_ld_offset; | |
6581 | ||
6582 | /* Offset to l_next field in struct link_map. */ | |
6583 | int l_next_offset; | |
6584 | ||
6585 | /* Offset to l_prev field in struct link_map. */ | |
6586 | int l_prev_offset; | |
6587 | }; | |
6588 | ||
8d56636a MM |
6589 | static const link_map_offsets lmo_32bit_offsets = |
6590 | { | |
6591 | 0, /* r_version offset. */ | |
6592 | 4, /* r_debug.r_map offset. */ | |
6593 | 20, /* r_debug_extended.r_next. */ | |
6594 | 0, /* l_addr offset in link_map. */ | |
6595 | 4, /* l_name offset in link_map. */ | |
6596 | 8, /* l_ld offset in link_map. */ | |
6597 | 12, /* l_next offset in link_map. */ | |
6598 | 16 /* l_prev offset in link_map. */ | |
6599 | }; | |
6600 | ||
6601 | static const link_map_offsets lmo_64bit_offsets = | |
6602 | { | |
6603 | 0, /* r_version offset. */ | |
6604 | 8, /* r_debug.r_map offset. */ | |
6605 | 40, /* r_debug_extended.r_next. */ | |
6606 | 0, /* l_addr offset in link_map. */ | |
6607 | 8, /* l_name offset in link_map. */ | |
6608 | 16, /* l_ld offset in link_map. */ | |
6609 | 24, /* l_next offset in link_map. */ | |
6610 | 32 /* l_prev offset in link_map. */ | |
6611 | }; | |
6612 | ||
6613 | /* Get the loaded shared libraries from one namespace. */ | |
6614 | ||
6615 | static void | |
2733d9d5 MM |
6616 | read_link_map (std::string &document, CORE_ADDR lmid, CORE_ADDR lm_addr, |
6617 | CORE_ADDR lm_prev, int ptr_size, const link_map_offsets *lmo) | |
8d56636a MM |
6618 | { |
6619 | CORE_ADDR l_name, l_addr, l_ld, l_next, l_prev; | |
6620 | ||
6621 | while (lm_addr | |
6622 | && read_one_ptr (lm_addr + lmo->l_name_offset, | |
6623 | &l_name, ptr_size) == 0 | |
6624 | && read_one_ptr (lm_addr + lmo->l_addr_offset, | |
6625 | &l_addr, ptr_size) == 0 | |
6626 | && read_one_ptr (lm_addr + lmo->l_ld_offset, | |
6627 | &l_ld, ptr_size) == 0 | |
6628 | && read_one_ptr (lm_addr + lmo->l_prev_offset, | |
6629 | &l_prev, ptr_size) == 0 | |
6630 | && read_one_ptr (lm_addr + lmo->l_next_offset, | |
6631 | &l_next, ptr_size) == 0) | |
6632 | { | |
6633 | unsigned char libname[PATH_MAX]; | |
6634 | ||
6635 | if (lm_prev != l_prev) | |
6636 | { | |
6637 | warning ("Corrupted shared library list: 0x%s != 0x%s", | |
6638 | paddress (lm_prev), paddress (l_prev)); | |
6639 | break; | |
6640 | } | |
6641 | ||
ad10f44e MM |
6642 | /* Not checking for error because reading may stop before we've got |
6643 | PATH_MAX worth of characters. */ | |
6644 | libname[0] = '\0'; | |
6645 | linux_read_memory (l_name, libname, sizeof (libname) - 1); | |
6646 | libname[sizeof (libname) - 1] = '\0'; | |
6647 | if (libname[0] != '\0') | |
8d56636a | 6648 | { |
ad10f44e | 6649 | string_appendf (document, "<library name=\""); |
de75275f | 6650 | xml_escape_text_append (document, (char *) libname); |
ad10f44e | 6651 | string_appendf (document, "\" lm=\"0x%s\" l_addr=\"0x%s\" " |
2733d9d5 | 6652 | "l_ld=\"0x%s\" lmid=\"0x%s\"/>", |
ad10f44e | 6653 | paddress (lm_addr), paddress (l_addr), |
2733d9d5 | 6654 | paddress (l_ld), paddress (lmid)); |
8d56636a MM |
6655 | } |
6656 | ||
6657 | lm_prev = lm_addr; | |
6658 | lm_addr = l_next; | |
6659 | } | |
6660 | } | |
6661 | ||
fb723180 | 6662 | /* Construct qXfer:libraries-svr4:read reply. */ |
2268b414 | 6663 | |
974387bb TBA |
6664 | int |
6665 | linux_process_target::qxfer_libraries_svr4 (const char *annex, | |
6666 | unsigned char *readbuf, | |
6667 | unsigned const char *writebuf, | |
6668 | CORE_ADDR offset, int len) | |
2268b414 | 6669 | { |
fe978cb0 | 6670 | struct process_info_private *const priv = current_process ()->priv; |
2268b414 JK |
6671 | char filename[PATH_MAX]; |
6672 | int pid, is_elf64; | |
214d508e | 6673 | unsigned int machine; |
2733d9d5 | 6674 | CORE_ADDR lmid = 0, lm_addr = 0, lm_prev = 0; |
2268b414 JK |
6675 | |
6676 | if (writebuf != NULL) | |
6677 | return -2; | |
6678 | if (readbuf == NULL) | |
6679 | return -1; | |
6680 | ||
0bfdf32f | 6681 | pid = lwpid_of (current_thread); |
2268b414 | 6682 | xsnprintf (filename, sizeof filename, "/proc/%d/exe", pid); |
214d508e | 6683 | is_elf64 = elf_64_file_p (filename, &machine); |
8d56636a MM |
6684 | const link_map_offsets *lmo; |
6685 | int ptr_size; | |
6686 | if (is_elf64) | |
6687 | { | |
6688 | lmo = &lmo_64bit_offsets; | |
6689 | ptr_size = 8; | |
6690 | } | |
6691 | else | |
6692 | { | |
6693 | lmo = &lmo_32bit_offsets; | |
6694 | ptr_size = 4; | |
6695 | } | |
2268b414 | 6696 | |
b1fbec62 GB |
6697 | while (annex[0] != '\0') |
6698 | { | |
6699 | const char *sep; | |
6700 | CORE_ADDR *addrp; | |
da4ae14a | 6701 | int name_len; |
2268b414 | 6702 | |
b1fbec62 GB |
6703 | sep = strchr (annex, '='); |
6704 | if (sep == NULL) | |
6705 | break; | |
0c5bf5a9 | 6706 | |
da4ae14a | 6707 | name_len = sep - annex; |
2733d9d5 MM |
6708 | if (name_len == 4 && startswith (annex, "lmid")) |
6709 | addrp = &lmid; | |
6710 | else if (name_len == 5 && startswith (annex, "start")) | |
b1fbec62 | 6711 | addrp = &lm_addr; |
da4ae14a | 6712 | else if (name_len == 4 && startswith (annex, "prev")) |
b1fbec62 GB |
6713 | addrp = &lm_prev; |
6714 | else | |
6715 | { | |
6716 | annex = strchr (sep, ';'); | |
6717 | if (annex == NULL) | |
6718 | break; | |
6719 | annex++; | |
6720 | continue; | |
6721 | } | |
6722 | ||
6723 | annex = decode_address_to_semicolon (addrp, sep + 1); | |
2268b414 | 6724 | } |
b1fbec62 | 6725 | |
8d56636a MM |
6726 | std::string document = "<library-list-svr4 version=\"1.0\""; |
6727 | ||
6728 | /* When the starting LM_ADDR is passed in the annex, only traverse that | |
2733d9d5 | 6729 | namespace, which is assumed to be identified by LMID. |
8d56636a MM |
6730 | |
6731 | Otherwise, start with R_DEBUG and traverse all namespaces we find. */ | |
6732 | if (lm_addr != 0) | |
ad10f44e MM |
6733 | { |
6734 | document += ">"; | |
2733d9d5 | 6735 | read_link_map (document, lmid, lm_addr, lm_prev, ptr_size, lmo); |
ad10f44e | 6736 | } |
8d56636a | 6737 | else |
2268b414 | 6738 | { |
8d56636a MM |
6739 | if (lm_prev != 0) |
6740 | warning ("ignoring prev=0x%s without start", paddress (lm_prev)); | |
b1fbec62 | 6741 | |
2733d9d5 MM |
6742 | /* We could interpret LMID as 'provide only the libraries for this |
6743 | namespace' but GDB is currently only providing lmid, start, and | |
6744 | prev, or nothing. */ | |
6745 | if (lmid != 0) | |
6746 | warning ("ignoring lmid=0x%s without start", paddress (lmid)); | |
6747 | ||
8d56636a MM |
6748 | CORE_ADDR r_debug = priv->r_debug; |
6749 | if (r_debug == 0) | |
6750 | r_debug = priv->r_debug = get_r_debug (pid, is_elf64); | |
b1fbec62 GB |
6751 | |
6752 | /* We failed to find DT_DEBUG. Such situation will not change | |
6753 | for this inferior - do not retry it. Report it to GDB as | |
6754 | E01, see for the reasons at the GDB solib-svr4.c side. */ | |
8d56636a | 6755 | if (r_debug == (CORE_ADDR) -1) |
b1fbec62 GB |
6756 | return -1; |
6757 | ||
ad10f44e MM |
6758 | /* Terminate the header if we end up with an empty list. */ |
6759 | if (r_debug == 0) | |
6760 | document += ">"; | |
6761 | ||
8d56636a | 6762 | while (r_debug != 0) |
2268b414 | 6763 | { |
8d56636a MM |
6764 | int r_version = 0; |
6765 | if (linux_read_memory (r_debug + lmo->r_version_offset, | |
b1fbec62 | 6766 | (unsigned char *) &r_version, |
8d56636a MM |
6767 | sizeof (r_version)) != 0) |
6768 | { | |
6769 | warning ("unable to read r_version from 0x%s", | |
6770 | paddress (r_debug + lmo->r_version_offset)); | |
6771 | break; | |
6772 | } | |
6773 | ||
6774 | if (r_version < 1) | |
b1fbec62 GB |
6775 | { |
6776 | warning ("unexpected r_debug version %d", r_version); | |
8d56636a | 6777 | break; |
b1fbec62 | 6778 | } |
8d56636a MM |
6779 | |
6780 | if (read_one_ptr (r_debug + lmo->r_map_offset, &lm_addr, | |
6781 | ptr_size) != 0) | |
b1fbec62 | 6782 | { |
8d56636a MM |
6783 | warning ("unable to read r_map from 0x%s", |
6784 | paddress (r_debug + lmo->r_map_offset)); | |
6785 | break; | |
b1fbec62 | 6786 | } |
2268b414 | 6787 | |
ad10f44e MM |
6788 | /* We read the entire namespace. */ |
6789 | lm_prev = 0; | |
6790 | ||
6791 | /* The first entry corresponds to the main executable unless the | |
6792 | dynamic loader was loaded late by a static executable. But | |
6793 | in such case the main executable does not have PT_DYNAMIC | |
6794 | present and we would not have gotten here. */ | |
6795 | if (r_debug == priv->r_debug) | |
6796 | { | |
6797 | if (lm_addr != 0) | |
6798 | string_appendf (document, " main-lm=\"0x%s\">", | |
6799 | paddress (lm_addr)); | |
6800 | else | |
6801 | document += ">"; | |
6802 | ||
6803 | lm_prev = lm_addr; | |
6804 | if (read_one_ptr (lm_addr + lmo->l_next_offset, | |
6805 | &lm_addr, ptr_size) != 0) | |
6806 | { | |
6807 | warning ("unable to read l_next from 0x%s", | |
6808 | paddress (lm_addr + lmo->l_next_offset)); | |
6809 | break; | |
6810 | } | |
6811 | } | |
6812 | ||
2733d9d5 | 6813 | read_link_map (document, r_debug, lm_addr, lm_prev, ptr_size, lmo); |
b1fbec62 | 6814 | |
8d56636a MM |
6815 | if (r_version < 2) |
6816 | break; | |
b1fbec62 | 6817 | |
8d56636a MM |
6818 | if (read_one_ptr (r_debug + lmo->r_next_offset, &r_debug, |
6819 | ptr_size) != 0) | |
2268b414 | 6820 | { |
8d56636a MM |
6821 | warning ("unable to read r_next from 0x%s", |
6822 | paddress (r_debug + lmo->r_next_offset)); | |
6823 | break; | |
d878444c | 6824 | } |
0afae3cf | 6825 | } |
2268b414 JK |
6826 | } |
6827 | ||
ad10f44e | 6828 | document += "</library-list-svr4>"; |
b1fbec62 | 6829 | |
f6e8a41e | 6830 | int document_len = document.length (); |
2268b414 JK |
6831 | if (offset < document_len) |
6832 | document_len -= offset; | |
6833 | else | |
6834 | document_len = 0; | |
6835 | if (len > document_len) | |
6836 | len = document_len; | |
6837 | ||
f6e8a41e | 6838 | memcpy (readbuf, document.data () + offset, len); |
2268b414 JK |
6839 | |
6840 | return len; | |
6841 | } | |
6842 | ||
9accd112 MM |
6843 | #ifdef HAVE_LINUX_BTRACE |
6844 | ||
8263b346 TBA |
6845 | bool |
6846 | linux_process_target::supports_btrace () | |
6847 | { | |
6848 | return true; | |
6849 | } | |
6850 | ||
79597bdd | 6851 | btrace_target_info * |
696c0d5e | 6852 | linux_process_target::enable_btrace (thread_info *tp, |
79597bdd TBA |
6853 | const btrace_config *conf) |
6854 | { | |
696c0d5e | 6855 | return linux_enable_btrace (tp->id, conf); |
79597bdd TBA |
6856 | } |
6857 | ||
969c39fb | 6858 | /* See to_disable_btrace target method. */ |
9accd112 | 6859 | |
79597bdd TBA |
6860 | int |
6861 | linux_process_target::disable_btrace (btrace_target_info *tinfo) | |
969c39fb MM |
6862 | { |
6863 | enum btrace_error err; | |
6864 | ||
6865 | err = linux_disable_btrace (tinfo); | |
6866 | return (err == BTRACE_ERR_NONE ? 0 : -1); | |
6867 | } | |
6868 | ||
bc504a31 | 6869 | /* Encode an Intel Processor Trace configuration. */ |
b20a6524 MM |
6870 | |
6871 | static void | |
873a185b | 6872 | linux_low_encode_pt_config (std::string *buffer, |
b20a6524 MM |
6873 | const struct btrace_data_pt_config *config) |
6874 | { | |
873a185b | 6875 | *buffer += "<pt-config>\n"; |
b20a6524 MM |
6876 | |
6877 | switch (config->cpu.vendor) | |
6878 | { | |
6879 | case CV_INTEL: | |
873a185b TT |
6880 | string_xml_appendf (*buffer, "<cpu vendor=\"GenuineIntel\" family=\"%u\" " |
6881 | "model=\"%u\" stepping=\"%u\"/>\n", | |
6882 | config->cpu.family, config->cpu.model, | |
6883 | config->cpu.stepping); | |
b20a6524 MM |
6884 | break; |
6885 | ||
6886 | default: | |
6887 | break; | |
6888 | } | |
6889 | ||
873a185b | 6890 | *buffer += "</pt-config>\n"; |
b20a6524 MM |
6891 | } |
6892 | ||
6893 | /* Encode a raw buffer. */ | |
6894 | ||
6895 | static void | |
873a185b | 6896 | linux_low_encode_raw (std::string *buffer, const gdb_byte *data, |
b20a6524 MM |
6897 | unsigned int size) |
6898 | { | |
6899 | if (size == 0) | |
6900 | return; | |
6901 | ||
268a13a5 | 6902 | /* We use hex encoding - see gdbsupport/rsp-low.h. */ |
873a185b | 6903 | *buffer += "<raw>\n"; |
b20a6524 MM |
6904 | |
6905 | while (size-- > 0) | |
6906 | { | |
6907 | char elem[2]; | |
6908 | ||
6909 | elem[0] = tohex ((*data >> 4) & 0xf); | |
6910 | elem[1] = tohex (*data++ & 0xf); | |
6911 | ||
8b2d5ef8 | 6912 | buffer->append (elem, 2); |
b20a6524 MM |
6913 | } |
6914 | ||
873a185b | 6915 | *buffer += "</raw>\n"; |
b20a6524 MM |
6916 | } |
6917 | ||
969c39fb MM |
6918 | /* See to_read_btrace target method. */ |
6919 | ||
79597bdd TBA |
6920 | int |
6921 | linux_process_target::read_btrace (btrace_target_info *tinfo, | |
873a185b | 6922 | std::string *buffer, |
79597bdd | 6923 | enum btrace_read_type type) |
9accd112 | 6924 | { |
734b0e4b | 6925 | struct btrace_data btrace; |
969c39fb | 6926 | enum btrace_error err; |
9accd112 | 6927 | |
969c39fb MM |
6928 | err = linux_read_btrace (&btrace, tinfo, type); |
6929 | if (err != BTRACE_ERR_NONE) | |
6930 | { | |
6931 | if (err == BTRACE_ERR_OVERFLOW) | |
873a185b | 6932 | *buffer += "E.Overflow."; |
969c39fb | 6933 | else |
873a185b | 6934 | *buffer += "E.Generic Error."; |
969c39fb | 6935 | |
8dcc53b3 | 6936 | return -1; |
969c39fb | 6937 | } |
9accd112 | 6938 | |
734b0e4b MM |
6939 | switch (btrace.format) |
6940 | { | |
6941 | case BTRACE_FORMAT_NONE: | |
873a185b | 6942 | *buffer += "E.No Trace."; |
8dcc53b3 | 6943 | return -1; |
734b0e4b MM |
6944 | |
6945 | case BTRACE_FORMAT_BTS: | |
873a185b TT |
6946 | *buffer += "<!DOCTYPE btrace SYSTEM \"btrace.dtd\">\n"; |
6947 | *buffer += "<btrace version=\"1.0\">\n"; | |
9accd112 | 6948 | |
46f29a9a | 6949 | for (const btrace_block &block : *btrace.variant.bts.blocks) |
873a185b TT |
6950 | string_xml_appendf (*buffer, "<block begin=\"0x%s\" end=\"0x%s\"/>\n", |
6951 | paddress (block.begin), paddress (block.end)); | |
9accd112 | 6952 | |
873a185b | 6953 | *buffer += "</btrace>\n"; |
734b0e4b MM |
6954 | break; |
6955 | ||
b20a6524 | 6956 | case BTRACE_FORMAT_PT: |
873a185b TT |
6957 | *buffer += "<!DOCTYPE btrace SYSTEM \"btrace.dtd\">\n"; |
6958 | *buffer += "<btrace version=\"1.0\">\n"; | |
6959 | *buffer += "<pt>\n"; | |
b20a6524 MM |
6960 | |
6961 | linux_low_encode_pt_config (buffer, &btrace.variant.pt.config); | |
9accd112 | 6962 | |
b20a6524 MM |
6963 | linux_low_encode_raw (buffer, btrace.variant.pt.data, |
6964 | btrace.variant.pt.size); | |
6965 | ||
873a185b TT |
6966 | *buffer += "</pt>\n"; |
6967 | *buffer += "</btrace>\n"; | |
b20a6524 MM |
6968 | break; |
6969 | ||
6970 | default: | |
873a185b | 6971 | *buffer += "E.Unsupported Trace Format."; |
8dcc53b3 | 6972 | return -1; |
734b0e4b | 6973 | } |
969c39fb MM |
6974 | |
6975 | return 0; | |
9accd112 | 6976 | } |
f4abbc16 MM |
6977 | |
6978 | /* See to_btrace_conf target method. */ | |
6979 | ||
79597bdd TBA |
6980 | int |
6981 | linux_process_target::read_btrace_conf (const btrace_target_info *tinfo, | |
873a185b | 6982 | std::string *buffer) |
f4abbc16 MM |
6983 | { |
6984 | const struct btrace_config *conf; | |
6985 | ||
873a185b TT |
6986 | *buffer += "<!DOCTYPE btrace-conf SYSTEM \"btrace-conf.dtd\">\n"; |
6987 | *buffer += "<btrace-conf version=\"1.0\">\n"; | |
f4abbc16 MM |
6988 | |
6989 | conf = linux_btrace_conf (tinfo); | |
6990 | if (conf != NULL) | |
6991 | { | |
6992 | switch (conf->format) | |
6993 | { | |
6994 | case BTRACE_FORMAT_NONE: | |
6995 | break; | |
6996 | ||
6997 | case BTRACE_FORMAT_BTS: | |
873a185b TT |
6998 | string_xml_appendf (*buffer, "<bts"); |
6999 | string_xml_appendf (*buffer, " size=\"0x%x\"", conf->bts.size); | |
7000 | string_xml_appendf (*buffer, " />\n"); | |
f4abbc16 | 7001 | break; |
b20a6524 MM |
7002 | |
7003 | case BTRACE_FORMAT_PT: | |
873a185b TT |
7004 | string_xml_appendf (*buffer, "<pt"); |
7005 | string_xml_appendf (*buffer, " size=\"0x%x\"", conf->pt.size); | |
7006 | string_xml_appendf (*buffer, "/>\n"); | |
b20a6524 | 7007 | break; |
f4abbc16 MM |
7008 | } |
7009 | } | |
7010 | ||
873a185b | 7011 | *buffer += "</btrace-conf>\n"; |
f4abbc16 MM |
7012 | return 0; |
7013 | } | |
9accd112 MM |
7014 | #endif /* HAVE_LINUX_BTRACE */ |
7015 | ||
7b669087 GB |
7016 | /* See nat/linux-nat.h. */ |
7017 | ||
7018 | ptid_t | |
7019 | current_lwp_ptid (void) | |
7020 | { | |
7021 | return ptid_of (current_thread); | |
7022 | } | |
7023 | ||
07b3255c | 7024 | /* A helper function that copies NAME to DEST, replacing non-printable |
862180a2 TT |
7025 | characters with '?'. Returns the original DEST as a |
7026 | convenience. */ | |
07b3255c TT |
7027 | |
7028 | static const char * | |
7029 | replace_non_ascii (char *dest, const char *name) | |
7030 | { | |
862180a2 | 7031 | const char *result = dest; |
07b3255c TT |
7032 | while (*name != '\0') |
7033 | { | |
7034 | if (!ISPRINT (*name)) | |
7035 | *dest++ = '?'; | |
7036 | else | |
7037 | *dest++ = *name; | |
7038 | ++name; | |
7039 | } | |
862180a2 TT |
7040 | *dest = '\0'; |
7041 | return result; | |
07b3255c TT |
7042 | } |
7043 | ||
7f63b89b TBA |
7044 | const char * |
7045 | linux_process_target::thread_name (ptid_t thread) | |
7046 | { | |
07b3255c TT |
7047 | static char dest[100]; |
7048 | ||
7049 | const char *name = linux_proc_tid_get_name (thread); | |
7050 | if (name == nullptr) | |
7051 | return nullptr; | |
7052 | ||
7053 | /* Linux limits the comm file to 16 bytes (including the trailing | |
7054 | \0. If the program or thread name is set when using a multi-byte | |
7055 | encoding, this might cause it to be truncated mid-character. In | |
7056 | this situation, sending the truncated form in an XML <thread> | |
7057 | response will cause a parse error in gdb. So, instead convert | |
7058 | from the locale's encoding (we can't be sure this is the correct | |
7059 | encoding, but it's as good a guess as we have) to UTF-8, but in a | |
7060 | way that ignores any encoding errors. See PR remote/30618. */ | |
7061 | const char *cset = nl_langinfo (CODESET); | |
7062 | iconv_t handle = iconv_open ("UTF-8//IGNORE", cset); | |
7063 | if (handle == (iconv_t) -1) | |
7064 | return replace_non_ascii (dest, name); | |
7065 | ||
7066 | size_t inbytes = strlen (name); | |
7067 | char *inbuf = const_cast<char *> (name); | |
7068 | size_t outbytes = sizeof (dest); | |
7069 | char *outbuf = dest; | |
7070 | size_t result = iconv (handle, &inbuf, &inbytes, &outbuf, &outbytes); | |
7071 | ||
7072 | if (result == (size_t) -1) | |
7073 | { | |
7074 | if (errno == E2BIG) | |
7075 | outbuf = &dest[sizeof (dest) - 1]; | |
7076 | else if ((errno == EILSEQ || errno == EINVAL) | |
7077 | && outbuf < &dest[sizeof (dest) - 2]) | |
7078 | *outbuf++ = '?'; | |
07b3255c | 7079 | } |
862180a2 | 7080 | *outbuf = '\0'; |
07b3255c TT |
7081 | |
7082 | iconv_close (handle); | |
7083 | return *dest == '\0' ? nullptr : dest; | |
7f63b89b TBA |
7084 | } |
7085 | ||
7086 | #if USE_THREAD_DB | |
7087 | bool | |
7088 | linux_process_target::thread_handle (ptid_t ptid, gdb_byte **handle, | |
7089 | int *handle_len) | |
7090 | { | |
7091 | return thread_db_thread_handle (ptid, handle, handle_len); | |
7092 | } | |
7093 | #endif | |
7094 | ||
7b961964 SM |
7095 | thread_info * |
7096 | linux_process_target::thread_pending_parent (thread_info *thread) | |
7097 | { | |
7098 | lwp_info *parent = get_thread_lwp (thread)->pending_parent (); | |
7099 | ||
7100 | if (parent == nullptr) | |
7101 | return nullptr; | |
7102 | ||
7103 | return get_lwp_thread (parent); | |
7104 | } | |
7105 | ||
df5ad102 | 7106 | thread_info * |
faf44a31 PA |
7107 | linux_process_target::thread_pending_child (thread_info *thread, |
7108 | target_waitkind *kind) | |
df5ad102 | 7109 | { |
faf44a31 | 7110 | lwp_info *child = get_thread_lwp (thread)->pending_child (kind); |
df5ad102 SM |
7111 | |
7112 | if (child == nullptr) | |
7113 | return nullptr; | |
7114 | ||
7115 | return get_lwp_thread (child); | |
7116 | } | |
7117 | ||
276d4552 YQ |
7118 | /* Default implementation of linux_target_ops method "set_pc" for |
7119 | 32-bit pc register which is literally named "pc". */ | |
7120 | ||
7121 | void | |
7122 | linux_set_pc_32bit (struct regcache *regcache, CORE_ADDR pc) | |
7123 | { | |
7124 | uint32_t newpc = pc; | |
7125 | ||
7126 | supply_register_by_name (regcache, "pc", &newpc); | |
7127 | } | |
7128 | ||
7129 | /* Default implementation of linux_target_ops method "get_pc" for | |
7130 | 32-bit pc register which is literally named "pc". */ | |
7131 | ||
7132 | CORE_ADDR | |
7133 | linux_get_pc_32bit (struct regcache *regcache) | |
7134 | { | |
7135 | uint32_t pc; | |
7136 | ||
7137 | collect_register_by_name (regcache, "pc", &pc); | |
c058728c | 7138 | threads_debug_printf ("stop pc is 0x%" PRIx32, pc); |
276d4552 YQ |
7139 | return pc; |
7140 | } | |
7141 | ||
6f69e520 YQ |
7142 | /* Default implementation of linux_target_ops method "set_pc" for |
7143 | 64-bit pc register which is literally named "pc". */ | |
7144 | ||
7145 | void | |
7146 | linux_set_pc_64bit (struct regcache *regcache, CORE_ADDR pc) | |
7147 | { | |
7148 | uint64_t newpc = pc; | |
7149 | ||
7150 | supply_register_by_name (regcache, "pc", &newpc); | |
7151 | } | |
7152 | ||
7153 | /* Default implementation of linux_target_ops method "get_pc" for | |
7154 | 64-bit pc register which is literally named "pc". */ | |
7155 | ||
7156 | CORE_ADDR | |
7157 | linux_get_pc_64bit (struct regcache *regcache) | |
7158 | { | |
7159 | uint64_t pc; | |
7160 | ||
7161 | collect_register_by_name (regcache, "pc", &pc); | |
c058728c | 7162 | threads_debug_printf ("stop pc is 0x%" PRIx64, pc); |
6f69e520 YQ |
7163 | return pc; |
7164 | } | |
7165 | ||
0570503d | 7166 | /* See linux-low.h. */ |
974c89e0 | 7167 | |
0570503d | 7168 | int |
43e5fbd8 | 7169 | linux_get_auxv (int pid, int wordsize, CORE_ADDR match, CORE_ADDR *valp) |
974c89e0 AH |
7170 | { |
7171 | gdb_byte *data = (gdb_byte *) alloca (2 * wordsize); | |
7172 | int offset = 0; | |
7173 | ||
7174 | gdb_assert (wordsize == 4 || wordsize == 8); | |
7175 | ||
43e5fbd8 TJB |
7176 | while (the_target->read_auxv (pid, offset, data, 2 * wordsize) |
7177 | == 2 * wordsize) | |
974c89e0 AH |
7178 | { |
7179 | if (wordsize == 4) | |
7180 | { | |
0570503d | 7181 | uint32_t *data_p = (uint32_t *) data; |
974c89e0 | 7182 | if (data_p[0] == match) |
0570503d PFC |
7183 | { |
7184 | *valp = data_p[1]; | |
7185 | return 1; | |
7186 | } | |
974c89e0 AH |
7187 | } |
7188 | else | |
7189 | { | |
0570503d | 7190 | uint64_t *data_p = (uint64_t *) data; |
974c89e0 | 7191 | if (data_p[0] == match) |
0570503d PFC |
7192 | { |
7193 | *valp = data_p[1]; | |
7194 | return 1; | |
7195 | } | |
974c89e0 AH |
7196 | } |
7197 | ||
7198 | offset += 2 * wordsize; | |
7199 | } | |
7200 | ||
7201 | return 0; | |
7202 | } | |
7203 | ||
7204 | /* See linux-low.h. */ | |
7205 | ||
7206 | CORE_ADDR | |
43e5fbd8 | 7207 | linux_get_hwcap (int pid, int wordsize) |
974c89e0 | 7208 | { |
0570503d | 7209 | CORE_ADDR hwcap = 0; |
43e5fbd8 | 7210 | linux_get_auxv (pid, wordsize, AT_HWCAP, &hwcap); |
0570503d | 7211 | return hwcap; |
974c89e0 AH |
7212 | } |
7213 | ||
7214 | /* See linux-low.h. */ | |
7215 | ||
7216 | CORE_ADDR | |
43e5fbd8 | 7217 | linux_get_hwcap2 (int pid, int wordsize) |
974c89e0 | 7218 | { |
0570503d | 7219 | CORE_ADDR hwcap2 = 0; |
43e5fbd8 | 7220 | linux_get_auxv (pid, wordsize, AT_HWCAP2, &hwcap2); |
0570503d | 7221 | return hwcap2; |
974c89e0 | 7222 | } |
6f69e520 | 7223 | |
3aee8918 PA |
7224 | #ifdef HAVE_LINUX_REGSETS |
7225 | void | |
7226 | initialize_regsets_info (struct regsets_info *info) | |
7227 | { | |
7228 | for (info->num_regsets = 0; | |
7229 | info->regsets[info->num_regsets].size >= 0; | |
7230 | info->num_regsets++) | |
7231 | ; | |
3aee8918 PA |
7232 | } |
7233 | #endif | |
7234 | ||
da6d8c04 DJ |
7235 | void |
7236 | initialize_low (void) | |
7237 | { | |
bd99dc85 | 7238 | struct sigaction sigchld_action; |
dd373349 | 7239 | |
bd99dc85 | 7240 | memset (&sigchld_action, 0, sizeof (sigchld_action)); |
ef0478f6 | 7241 | set_target_ops (the_linux_target); |
dd373349 | 7242 | |
aa7c7447 | 7243 | linux_ptrace_init_warnings (); |
1b919490 | 7244 | linux_proc_init_warnings (); |
bd99dc85 PA |
7245 | |
7246 | sigchld_action.sa_handler = sigchld_handler; | |
7247 | sigemptyset (&sigchld_action.sa_mask); | |
7248 | sigchld_action.sa_flags = SA_RESTART; | |
7249 | sigaction (SIGCHLD, &sigchld_action, NULL); | |
3aee8918 PA |
7250 | |
7251 | initialize_low_arch (); | |
89245bc0 DB |
7252 | |
7253 | linux_check_ptrace_features (); | |
da6d8c04 | 7254 | } |