Commit | Line | Data |
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da6d8c04 | 1 | /* Low level interface to ptrace, for the remote server for GDB. |
b811d2c2 | 2 | Copyright (C) 1995-2020 Free Software Foundation, Inc. |
da6d8c04 DJ |
3 | |
4 | This file is part of GDB. | |
5 | ||
6 | This program is free software; you can redistribute it and/or modify | |
7 | it under the terms of the GNU General Public License as published by | |
a9762ec7 | 8 | the Free Software Foundation; either version 3 of the License, or |
da6d8c04 DJ |
9 | (at your option) any later version. |
10 | ||
11 | This program is distributed in the hope that it will be useful, | |
12 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
13 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
14 | GNU General Public License for more details. | |
15 | ||
16 | You should have received a copy of the GNU General Public License | |
a9762ec7 | 17 | along with this program. If not, see <http://www.gnu.org/licenses/>. */ |
da6d8c04 DJ |
18 | |
19 | #include "server.h" | |
58caa3dc | 20 | #include "linux-low.h" |
125f8a3d | 21 | #include "nat/linux-osdata.h" |
268a13a5 | 22 | #include "gdbsupport/agent.h" |
de0d863e | 23 | #include "tdesc.h" |
268a13a5 TT |
24 | #include "gdbsupport/rsp-low.h" |
25 | #include "gdbsupport/signals-state-save-restore.h" | |
96d7229d LM |
26 | #include "nat/linux-nat.h" |
27 | #include "nat/linux-waitpid.h" | |
268a13a5 | 28 | #include "gdbsupport/gdb_wait.h" |
5826e159 | 29 | #include "nat/gdb_ptrace.h" |
125f8a3d GB |
30 | #include "nat/linux-ptrace.h" |
31 | #include "nat/linux-procfs.h" | |
8cc73a39 | 32 | #include "nat/linux-personality.h" |
da6d8c04 DJ |
33 | #include <signal.h> |
34 | #include <sys/ioctl.h> | |
35 | #include <fcntl.h> | |
0a30fbc4 | 36 | #include <unistd.h> |
fd500816 | 37 | #include <sys/syscall.h> |
f9387fc3 | 38 | #include <sched.h> |
07e059b5 VP |
39 | #include <ctype.h> |
40 | #include <pwd.h> | |
41 | #include <sys/types.h> | |
42 | #include <dirent.h> | |
53ce3c39 | 43 | #include <sys/stat.h> |
efcbbd14 | 44 | #include <sys/vfs.h> |
1570b33e | 45 | #include <sys/uio.h> |
268a13a5 | 46 | #include "gdbsupport/filestuff.h" |
c144c7a0 | 47 | #include "tracepoint.h" |
276d4552 | 48 | #include <inttypes.h> |
268a13a5 | 49 | #include "gdbsupport/common-inferior.h" |
2090129c | 50 | #include "nat/fork-inferior.h" |
268a13a5 | 51 | #include "gdbsupport/environ.h" |
21987b9c | 52 | #include "gdbsupport/gdb-sigmask.h" |
268a13a5 | 53 | #include "gdbsupport/scoped_restore.h" |
957f3f49 DE |
54 | #ifndef ELFMAG0 |
55 | /* Don't include <linux/elf.h> here. If it got included by gdb_proc_service.h | |
56 | then ELFMAG0 will have been defined. If it didn't get included by | |
57 | gdb_proc_service.h then including it will likely introduce a duplicate | |
58 | definition of elf_fpregset_t. */ | |
59 | #include <elf.h> | |
60 | #endif | |
14d2069a | 61 | #include "nat/linux-namespaces.h" |
efcbbd14 | 62 | |
03583c20 UW |
63 | #ifdef HAVE_PERSONALITY |
64 | # include <sys/personality.h> | |
65 | # if !HAVE_DECL_ADDR_NO_RANDOMIZE | |
66 | # define ADDR_NO_RANDOMIZE 0x0040000 | |
67 | # endif | |
68 | #endif | |
69 | ||
fd462a61 DJ |
70 | #ifndef O_LARGEFILE |
71 | #define O_LARGEFILE 0 | |
72 | #endif | |
1a981360 | 73 | |
69f4c9cc AH |
74 | #ifndef AT_HWCAP2 |
75 | #define AT_HWCAP2 26 | |
76 | #endif | |
77 | ||
db0dfaa0 LM |
78 | /* Some targets did not define these ptrace constants from the start, |
79 | so gdbserver defines them locally here. In the future, these may | |
80 | be removed after they are added to asm/ptrace.h. */ | |
81 | #if !(defined(PT_TEXT_ADDR) \ | |
82 | || defined(PT_DATA_ADDR) \ | |
83 | || defined(PT_TEXT_END_ADDR)) | |
84 | #if defined(__mcoldfire__) | |
85 | /* These are still undefined in 3.10 kernels. */ | |
86 | #define PT_TEXT_ADDR 49*4 | |
87 | #define PT_DATA_ADDR 50*4 | |
88 | #define PT_TEXT_END_ADDR 51*4 | |
89 | /* BFIN already defines these since at least 2.6.32 kernels. */ | |
90 | #elif defined(BFIN) | |
91 | #define PT_TEXT_ADDR 220 | |
92 | #define PT_TEXT_END_ADDR 224 | |
93 | #define PT_DATA_ADDR 228 | |
94 | /* These are still undefined in 3.10 kernels. */ | |
95 | #elif defined(__TMS320C6X__) | |
96 | #define PT_TEXT_ADDR (0x10000*4) | |
97 | #define PT_DATA_ADDR (0x10004*4) | |
98 | #define PT_TEXT_END_ADDR (0x10008*4) | |
99 | #endif | |
100 | #endif | |
101 | ||
5203ae1e TBA |
102 | #if (defined(__UCLIBC__) \ |
103 | && defined(HAS_NOMMU) \ | |
104 | && defined(PT_TEXT_ADDR) \ | |
105 | && defined(PT_DATA_ADDR) \ | |
106 | && defined(PT_TEXT_END_ADDR)) | |
107 | #define SUPPORTS_READ_OFFSETS | |
108 | #endif | |
109 | ||
9accd112 | 110 | #ifdef HAVE_LINUX_BTRACE |
125f8a3d | 111 | # include "nat/linux-btrace.h" |
268a13a5 | 112 | # include "gdbsupport/btrace-common.h" |
9accd112 MM |
113 | #endif |
114 | ||
8365dcf5 TJB |
115 | #ifndef HAVE_ELF32_AUXV_T |
116 | /* Copied from glibc's elf.h. */ | |
117 | typedef struct | |
118 | { | |
119 | uint32_t a_type; /* Entry type */ | |
120 | union | |
121 | { | |
122 | uint32_t a_val; /* Integer value */ | |
123 | /* We use to have pointer elements added here. We cannot do that, | |
124 | though, since it does not work when using 32-bit definitions | |
125 | on 64-bit platforms and vice versa. */ | |
126 | } a_un; | |
127 | } Elf32_auxv_t; | |
128 | #endif | |
129 | ||
130 | #ifndef HAVE_ELF64_AUXV_T | |
131 | /* Copied from glibc's elf.h. */ | |
132 | typedef struct | |
133 | { | |
134 | uint64_t a_type; /* Entry type */ | |
135 | union | |
136 | { | |
137 | uint64_t a_val; /* Integer value */ | |
138 | /* We use to have pointer elements added here. We cannot do that, | |
139 | though, since it does not work when using 32-bit definitions | |
140 | on 64-bit platforms and vice versa. */ | |
141 | } a_un; | |
142 | } Elf64_auxv_t; | |
143 | #endif | |
144 | ||
ded48a5e YQ |
145 | /* Does the current host support PTRACE_GETREGSET? */ |
146 | int have_ptrace_getregset = -1; | |
147 | ||
cff068da GB |
148 | /* LWP accessors. */ |
149 | ||
150 | /* See nat/linux-nat.h. */ | |
151 | ||
152 | ptid_t | |
153 | ptid_of_lwp (struct lwp_info *lwp) | |
154 | { | |
155 | return ptid_of (get_lwp_thread (lwp)); | |
156 | } | |
157 | ||
158 | /* See nat/linux-nat.h. */ | |
159 | ||
4b134ca1 GB |
160 | void |
161 | lwp_set_arch_private_info (struct lwp_info *lwp, | |
162 | struct arch_lwp_info *info) | |
163 | { | |
164 | lwp->arch_private = info; | |
165 | } | |
166 | ||
167 | /* See nat/linux-nat.h. */ | |
168 | ||
169 | struct arch_lwp_info * | |
170 | lwp_arch_private_info (struct lwp_info *lwp) | |
171 | { | |
172 | return lwp->arch_private; | |
173 | } | |
174 | ||
175 | /* See nat/linux-nat.h. */ | |
176 | ||
cff068da GB |
177 | int |
178 | lwp_is_stopped (struct lwp_info *lwp) | |
179 | { | |
180 | return lwp->stopped; | |
181 | } | |
182 | ||
183 | /* See nat/linux-nat.h. */ | |
184 | ||
185 | enum target_stop_reason | |
186 | lwp_stop_reason (struct lwp_info *lwp) | |
187 | { | |
188 | return lwp->stop_reason; | |
189 | } | |
190 | ||
0e00e962 AA |
191 | /* See nat/linux-nat.h. */ |
192 | ||
193 | int | |
194 | lwp_is_stepping (struct lwp_info *lwp) | |
195 | { | |
196 | return lwp->stepping; | |
197 | } | |
198 | ||
05044653 PA |
199 | /* A list of all unknown processes which receive stop signals. Some |
200 | other process will presumably claim each of these as forked | |
201 | children momentarily. */ | |
24a09b5f | 202 | |
05044653 PA |
203 | struct simple_pid_list |
204 | { | |
205 | /* The process ID. */ | |
206 | int pid; | |
207 | ||
208 | /* The status as reported by waitpid. */ | |
209 | int status; | |
210 | ||
211 | /* Next in chain. */ | |
212 | struct simple_pid_list *next; | |
213 | }; | |
214 | struct simple_pid_list *stopped_pids; | |
215 | ||
216 | /* Trivial list manipulation functions to keep track of a list of new | |
217 | stopped processes. */ | |
218 | ||
219 | static void | |
220 | add_to_pid_list (struct simple_pid_list **listp, int pid, int status) | |
221 | { | |
8d749320 | 222 | struct simple_pid_list *new_pid = XNEW (struct simple_pid_list); |
05044653 PA |
223 | |
224 | new_pid->pid = pid; | |
225 | new_pid->status = status; | |
226 | new_pid->next = *listp; | |
227 | *listp = new_pid; | |
228 | } | |
229 | ||
230 | static int | |
231 | pull_pid_from_list (struct simple_pid_list **listp, int pid, int *statusp) | |
232 | { | |
233 | struct simple_pid_list **p; | |
234 | ||
235 | for (p = listp; *p != NULL; p = &(*p)->next) | |
236 | if ((*p)->pid == pid) | |
237 | { | |
238 | struct simple_pid_list *next = (*p)->next; | |
239 | ||
240 | *statusp = (*p)->status; | |
241 | xfree (*p); | |
242 | *p = next; | |
243 | return 1; | |
244 | } | |
245 | return 0; | |
246 | } | |
24a09b5f | 247 | |
bde24c0a PA |
248 | enum stopping_threads_kind |
249 | { | |
250 | /* Not stopping threads presently. */ | |
251 | NOT_STOPPING_THREADS, | |
252 | ||
253 | /* Stopping threads. */ | |
254 | STOPPING_THREADS, | |
255 | ||
256 | /* Stopping and suspending threads. */ | |
257 | STOPPING_AND_SUSPENDING_THREADS | |
258 | }; | |
259 | ||
260 | /* This is set while stop_all_lwps is in effect. */ | |
261 | enum stopping_threads_kind stopping_threads = NOT_STOPPING_THREADS; | |
0d62e5e8 DJ |
262 | |
263 | /* FIXME make into a target method? */ | |
24a09b5f | 264 | int using_threads = 1; |
24a09b5f | 265 | |
fa593d66 PA |
266 | /* True if we're presently stabilizing threads (moving them out of |
267 | jump pads). */ | |
268 | static int stabilizing_threads; | |
269 | ||
2acc282a | 270 | static void linux_resume_one_lwp (struct lwp_info *lwp, |
54a0b537 | 271 | int step, int signal, siginfo_t *info); |
f50bf8e5 | 272 | static void unsuspend_all_lwps (struct lwp_info *except); |
b3312d80 | 273 | static struct lwp_info *add_lwp (ptid_t ptid); |
95954743 | 274 | static void mark_lwp_dead (struct lwp_info *lwp, int wstat); |
00db26fa | 275 | static int lwp_is_marked_dead (struct lwp_info *lwp); |
d50171e4 | 276 | static int finish_step_over (struct lwp_info *lwp); |
d50171e4 | 277 | static int kill_lwp (unsigned long lwpid, int signo); |
863d01bd | 278 | static void enqueue_pending_signal (struct lwp_info *lwp, int signal, siginfo_t *info); |
ece66d65 | 279 | static int linux_low_ptrace_options (int attached); |
ced2dffb | 280 | static int check_ptrace_stopped_lwp_gone (struct lwp_info *lp); |
e2b44075 | 281 | static void proceed_one_lwp (thread_info *thread, lwp_info *except); |
d50171e4 | 282 | |
582511be PA |
283 | /* When the event-loop is doing a step-over, this points at the thread |
284 | being stepped. */ | |
285 | ptid_t step_over_bkpt; | |
286 | ||
7d00775e | 287 | /* True if the low target can hardware single-step. */ |
d50171e4 PA |
288 | |
289 | static int | |
290 | can_hardware_single_step (void) | |
291 | { | |
7d00775e AT |
292 | if (the_low_target.supports_hardware_single_step != NULL) |
293 | return the_low_target.supports_hardware_single_step (); | |
294 | else | |
295 | return 0; | |
296 | } | |
297 | ||
298 | /* True if the low target can software single-step. Such targets | |
fa5308bd | 299 | implement the GET_NEXT_PCS callback. */ |
7d00775e AT |
300 | |
301 | static int | |
302 | can_software_single_step (void) | |
303 | { | |
fa5308bd | 304 | return (the_low_target.get_next_pcs != NULL); |
d50171e4 PA |
305 | } |
306 | ||
307 | /* True if the low target supports memory breakpoints. If so, we'll | |
308 | have a GET_PC implementation. */ | |
309 | ||
310 | static int | |
311 | supports_breakpoints (void) | |
312 | { | |
313 | return (the_low_target.get_pc != NULL); | |
314 | } | |
0d62e5e8 | 315 | |
fa593d66 PA |
316 | /* Returns true if this target can support fast tracepoints. This |
317 | does not mean that the in-process agent has been loaded in the | |
318 | inferior. */ | |
319 | ||
320 | static int | |
321 | supports_fast_tracepoints (void) | |
322 | { | |
323 | return the_low_target.install_fast_tracepoint_jump_pad != NULL; | |
324 | } | |
325 | ||
c2d6af84 PA |
326 | /* True if LWP is stopped in its stepping range. */ |
327 | ||
328 | static int | |
329 | lwp_in_step_range (struct lwp_info *lwp) | |
330 | { | |
331 | CORE_ADDR pc = lwp->stop_pc; | |
332 | ||
333 | return (pc >= lwp->step_range_start && pc < lwp->step_range_end); | |
334 | } | |
335 | ||
0d62e5e8 DJ |
336 | struct pending_signals |
337 | { | |
338 | int signal; | |
32ca6d61 | 339 | siginfo_t info; |
0d62e5e8 DJ |
340 | struct pending_signals *prev; |
341 | }; | |
611cb4a5 | 342 | |
bd99dc85 PA |
343 | /* The read/write ends of the pipe registered as waitable file in the |
344 | event loop. */ | |
345 | static int linux_event_pipe[2] = { -1, -1 }; | |
346 | ||
347 | /* True if we're currently in async mode. */ | |
348 | #define target_is_async_p() (linux_event_pipe[0] != -1) | |
349 | ||
02fc4de7 | 350 | static void send_sigstop (struct lwp_info *lwp); |
bd99dc85 | 351 | |
d0722149 DE |
352 | /* Return non-zero if HEADER is a 64-bit ELF file. */ |
353 | ||
354 | static int | |
214d508e | 355 | elf_64_header_p (const Elf64_Ehdr *header, unsigned int *machine) |
d0722149 | 356 | { |
214d508e L |
357 | if (header->e_ident[EI_MAG0] == ELFMAG0 |
358 | && header->e_ident[EI_MAG1] == ELFMAG1 | |
359 | && header->e_ident[EI_MAG2] == ELFMAG2 | |
360 | && header->e_ident[EI_MAG3] == ELFMAG3) | |
361 | { | |
362 | *machine = header->e_machine; | |
363 | return header->e_ident[EI_CLASS] == ELFCLASS64; | |
364 | ||
365 | } | |
366 | *machine = EM_NONE; | |
367 | return -1; | |
d0722149 DE |
368 | } |
369 | ||
370 | /* Return non-zero if FILE is a 64-bit ELF file, | |
371 | zero if the file is not a 64-bit ELF file, | |
372 | and -1 if the file is not accessible or doesn't exist. */ | |
373 | ||
be07f1a2 | 374 | static int |
214d508e | 375 | elf_64_file_p (const char *file, unsigned int *machine) |
d0722149 | 376 | { |
957f3f49 | 377 | Elf64_Ehdr header; |
d0722149 DE |
378 | int fd; |
379 | ||
380 | fd = open (file, O_RDONLY); | |
381 | if (fd < 0) | |
382 | return -1; | |
383 | ||
384 | if (read (fd, &header, sizeof (header)) != sizeof (header)) | |
385 | { | |
386 | close (fd); | |
387 | return 0; | |
388 | } | |
389 | close (fd); | |
390 | ||
214d508e | 391 | return elf_64_header_p (&header, machine); |
d0722149 DE |
392 | } |
393 | ||
be07f1a2 PA |
394 | /* Accepts an integer PID; Returns true if the executable PID is |
395 | running is a 64-bit ELF file.. */ | |
396 | ||
397 | int | |
214d508e | 398 | linux_pid_exe_is_elf_64_file (int pid, unsigned int *machine) |
be07f1a2 | 399 | { |
d8d2a3ee | 400 | char file[PATH_MAX]; |
be07f1a2 PA |
401 | |
402 | sprintf (file, "/proc/%d/exe", pid); | |
214d508e | 403 | return elf_64_file_p (file, machine); |
be07f1a2 PA |
404 | } |
405 | ||
bd99dc85 PA |
406 | static void |
407 | delete_lwp (struct lwp_info *lwp) | |
408 | { | |
fa96cb38 PA |
409 | struct thread_info *thr = get_lwp_thread (lwp); |
410 | ||
411 | if (debug_threads) | |
412 | debug_printf ("deleting %ld\n", lwpid_of (thr)); | |
413 | ||
414 | remove_thread (thr); | |
466eecee SM |
415 | |
416 | if (the_low_target.delete_thread != NULL) | |
417 | the_low_target.delete_thread (lwp->arch_private); | |
418 | else | |
419 | gdb_assert (lwp->arch_private == NULL); | |
420 | ||
bd99dc85 PA |
421 | free (lwp); |
422 | } | |
423 | ||
95954743 PA |
424 | /* Add a process to the common process list, and set its private |
425 | data. */ | |
426 | ||
427 | static struct process_info * | |
428 | linux_add_process (int pid, int attached) | |
429 | { | |
430 | struct process_info *proc; | |
431 | ||
95954743 | 432 | proc = add_process (pid, attached); |
8d749320 | 433 | proc->priv = XCNEW (struct process_info_private); |
95954743 | 434 | |
aa5ca48f | 435 | if (the_low_target.new_process != NULL) |
fe978cb0 | 436 | proc->priv->arch_private = the_low_target.new_process (); |
aa5ca48f | 437 | |
95954743 PA |
438 | return proc; |
439 | } | |
440 | ||
582511be PA |
441 | static CORE_ADDR get_pc (struct lwp_info *lwp); |
442 | ||
797bcff5 TBA |
443 | void |
444 | linux_process_target::arch_setup_thread (thread_info *thread) | |
94585166 DB |
445 | { |
446 | struct thread_info *saved_thread; | |
447 | ||
448 | saved_thread = current_thread; | |
449 | current_thread = thread; | |
450 | ||
797bcff5 | 451 | low_arch_setup (); |
94585166 DB |
452 | |
453 | current_thread = saved_thread; | |
454 | } | |
455 | ||
d16f3f6c TBA |
456 | int |
457 | linux_process_target::handle_extended_wait (lwp_info **orig_event_lwp, | |
458 | int wstat) | |
24a09b5f | 459 | { |
c12a5089 | 460 | client_state &cs = get_client_state (); |
94585166 | 461 | struct lwp_info *event_lwp = *orig_event_lwp; |
89a5711c | 462 | int event = linux_ptrace_get_extended_event (wstat); |
de0d863e | 463 | struct thread_info *event_thr = get_lwp_thread (event_lwp); |
54a0b537 | 464 | struct lwp_info *new_lwp; |
24a09b5f | 465 | |
65706a29 PA |
466 | gdb_assert (event_lwp->waitstatus.kind == TARGET_WAITKIND_IGNORE); |
467 | ||
82075af2 JS |
468 | /* All extended events we currently use are mid-syscall. Only |
469 | PTRACE_EVENT_STOP is delivered more like a signal-stop, but | |
470 | you have to be using PTRACE_SEIZE to get that. */ | |
471 | event_lwp->syscall_state = TARGET_WAITKIND_SYSCALL_ENTRY; | |
472 | ||
c269dbdb DB |
473 | if ((event == PTRACE_EVENT_FORK) || (event == PTRACE_EVENT_VFORK) |
474 | || (event == PTRACE_EVENT_CLONE)) | |
24a09b5f | 475 | { |
95954743 | 476 | ptid_t ptid; |
24a09b5f | 477 | unsigned long new_pid; |
05044653 | 478 | int ret, status; |
24a09b5f | 479 | |
de0d863e | 480 | /* Get the pid of the new lwp. */ |
d86d4aaf | 481 | ptrace (PTRACE_GETEVENTMSG, lwpid_of (event_thr), (PTRACE_TYPE_ARG3) 0, |
56f7af9c | 482 | &new_pid); |
24a09b5f DJ |
483 | |
484 | /* If we haven't already seen the new PID stop, wait for it now. */ | |
05044653 | 485 | if (!pull_pid_from_list (&stopped_pids, new_pid, &status)) |
24a09b5f DJ |
486 | { |
487 | /* The new child has a pending SIGSTOP. We can't affect it until it | |
488 | hits the SIGSTOP, but we're already attached. */ | |
489 | ||
97438e3f | 490 | ret = my_waitpid (new_pid, &status, __WALL); |
24a09b5f DJ |
491 | |
492 | if (ret == -1) | |
493 | perror_with_name ("waiting for new child"); | |
494 | else if (ret != new_pid) | |
495 | warning ("wait returned unexpected PID %d", ret); | |
da5898ce | 496 | else if (!WIFSTOPPED (status)) |
24a09b5f DJ |
497 | warning ("wait returned unexpected status 0x%x", status); |
498 | } | |
499 | ||
c269dbdb | 500 | if (event == PTRACE_EVENT_FORK || event == PTRACE_EVENT_VFORK) |
de0d863e DB |
501 | { |
502 | struct process_info *parent_proc; | |
503 | struct process_info *child_proc; | |
504 | struct lwp_info *child_lwp; | |
bfacd19d | 505 | struct thread_info *child_thr; |
de0d863e DB |
506 | struct target_desc *tdesc; |
507 | ||
fd79271b | 508 | ptid = ptid_t (new_pid, new_pid, 0); |
de0d863e DB |
509 | |
510 | if (debug_threads) | |
511 | { | |
512 | debug_printf ("HEW: Got fork event from LWP %ld, " | |
513 | "new child is %d\n", | |
e38504b3 | 514 | ptid_of (event_thr).lwp (), |
e99b03dc | 515 | ptid.pid ()); |
de0d863e DB |
516 | } |
517 | ||
518 | /* Add the new process to the tables and clone the breakpoint | |
519 | lists of the parent. We need to do this even if the new process | |
520 | will be detached, since we will need the process object and the | |
521 | breakpoints to remove any breakpoints from memory when we | |
522 | detach, and the client side will access registers. */ | |
523 | child_proc = linux_add_process (new_pid, 0); | |
524 | gdb_assert (child_proc != NULL); | |
525 | child_lwp = add_lwp (ptid); | |
526 | gdb_assert (child_lwp != NULL); | |
527 | child_lwp->stopped = 1; | |
bfacd19d DB |
528 | child_lwp->must_set_ptrace_flags = 1; |
529 | child_lwp->status_pending_p = 0; | |
530 | child_thr = get_lwp_thread (child_lwp); | |
531 | child_thr->last_resume_kind = resume_stop; | |
998d452a PA |
532 | child_thr->last_status.kind = TARGET_WAITKIND_STOPPED; |
533 | ||
863d01bd | 534 | /* If we're suspending all threads, leave this one suspended |
0f8288ae YQ |
535 | too. If the fork/clone parent is stepping over a breakpoint, |
536 | all other threads have been suspended already. Leave the | |
537 | child suspended too. */ | |
538 | if (stopping_threads == STOPPING_AND_SUSPENDING_THREADS | |
539 | || event_lwp->bp_reinsert != 0) | |
863d01bd PA |
540 | { |
541 | if (debug_threads) | |
542 | debug_printf ("HEW: leaving child suspended\n"); | |
543 | child_lwp->suspended = 1; | |
544 | } | |
545 | ||
de0d863e DB |
546 | parent_proc = get_thread_process (event_thr); |
547 | child_proc->attached = parent_proc->attached; | |
2e7b624b YQ |
548 | |
549 | if (event_lwp->bp_reinsert != 0 | |
550 | && can_software_single_step () | |
551 | && event == PTRACE_EVENT_VFORK) | |
552 | { | |
3b9a79ef YQ |
553 | /* If we leave single-step breakpoints there, child will |
554 | hit it, so uninsert single-step breakpoints from parent | |
2e7b624b YQ |
555 | (and child). Once vfork child is done, reinsert |
556 | them back to parent. */ | |
3b9a79ef | 557 | uninsert_single_step_breakpoints (event_thr); |
2e7b624b YQ |
558 | } |
559 | ||
63c40ec7 | 560 | clone_all_breakpoints (child_thr, event_thr); |
de0d863e | 561 | |
cc397f3a | 562 | tdesc = allocate_target_description (); |
de0d863e DB |
563 | copy_target_description (tdesc, parent_proc->tdesc); |
564 | child_proc->tdesc = tdesc; | |
de0d863e | 565 | |
3a8a0396 DB |
566 | /* Clone arch-specific process data. */ |
567 | if (the_low_target.new_fork != NULL) | |
568 | the_low_target.new_fork (parent_proc, child_proc); | |
569 | ||
de0d863e | 570 | /* Save fork info in the parent thread. */ |
c269dbdb DB |
571 | if (event == PTRACE_EVENT_FORK) |
572 | event_lwp->waitstatus.kind = TARGET_WAITKIND_FORKED; | |
573 | else if (event == PTRACE_EVENT_VFORK) | |
574 | event_lwp->waitstatus.kind = TARGET_WAITKIND_VFORKED; | |
575 | ||
de0d863e | 576 | event_lwp->waitstatus.value.related_pid = ptid; |
c269dbdb | 577 | |
de0d863e DB |
578 | /* The status_pending field contains bits denoting the |
579 | extended event, so when the pending event is handled, | |
580 | the handler will look at lwp->waitstatus. */ | |
581 | event_lwp->status_pending_p = 1; | |
582 | event_lwp->status_pending = wstat; | |
583 | ||
5a04c4cf PA |
584 | /* Link the threads until the parent event is passed on to |
585 | higher layers. */ | |
586 | event_lwp->fork_relative = child_lwp; | |
587 | child_lwp->fork_relative = event_lwp; | |
588 | ||
3b9a79ef YQ |
589 | /* If the parent thread is doing step-over with single-step |
590 | breakpoints, the list of single-step breakpoints are cloned | |
2e7b624b YQ |
591 | from the parent's. Remove them from the child process. |
592 | In case of vfork, we'll reinsert them back once vforked | |
593 | child is done. */ | |
8a81c5d7 | 594 | if (event_lwp->bp_reinsert != 0 |
2e7b624b | 595 | && can_software_single_step ()) |
8a81c5d7 | 596 | { |
8a81c5d7 YQ |
597 | /* The child process is forked and stopped, so it is safe |
598 | to access its memory without stopping all other threads | |
599 | from other processes. */ | |
3b9a79ef | 600 | delete_single_step_breakpoints (child_thr); |
8a81c5d7 | 601 | |
3b9a79ef YQ |
602 | gdb_assert (has_single_step_breakpoints (event_thr)); |
603 | gdb_assert (!has_single_step_breakpoints (child_thr)); | |
8a81c5d7 YQ |
604 | } |
605 | ||
de0d863e DB |
606 | /* Report the event. */ |
607 | return 0; | |
608 | } | |
609 | ||
fa96cb38 PA |
610 | if (debug_threads) |
611 | debug_printf ("HEW: Got clone event " | |
612 | "from LWP %ld, new child is LWP %ld\n", | |
613 | lwpid_of (event_thr), new_pid); | |
614 | ||
fd79271b | 615 | ptid = ptid_t (pid_of (event_thr), new_pid, 0); |
b3312d80 | 616 | new_lwp = add_lwp (ptid); |
24a09b5f | 617 | |
e27d73f6 DE |
618 | /* Either we're going to immediately resume the new thread |
619 | or leave it stopped. linux_resume_one_lwp is a nop if it | |
620 | thinks the thread is currently running, so set this first | |
621 | before calling linux_resume_one_lwp. */ | |
622 | new_lwp->stopped = 1; | |
623 | ||
0f8288ae YQ |
624 | /* If we're suspending all threads, leave this one suspended |
625 | too. If the fork/clone parent is stepping over a breakpoint, | |
626 | all other threads have been suspended already. Leave the | |
627 | child suspended too. */ | |
628 | if (stopping_threads == STOPPING_AND_SUSPENDING_THREADS | |
629 | || event_lwp->bp_reinsert != 0) | |
bde24c0a PA |
630 | new_lwp->suspended = 1; |
631 | ||
da5898ce DJ |
632 | /* Normally we will get the pending SIGSTOP. But in some cases |
633 | we might get another signal delivered to the group first. | |
f21cc1a2 | 634 | If we do get another signal, be sure not to lose it. */ |
20ba1ce6 | 635 | if (WSTOPSIG (status) != SIGSTOP) |
da5898ce | 636 | { |
54a0b537 | 637 | new_lwp->stop_expected = 1; |
20ba1ce6 PA |
638 | new_lwp->status_pending_p = 1; |
639 | new_lwp->status_pending = status; | |
da5898ce | 640 | } |
c12a5089 | 641 | else if (cs.report_thread_events) |
65706a29 PA |
642 | { |
643 | new_lwp->waitstatus.kind = TARGET_WAITKIND_THREAD_CREATED; | |
644 | new_lwp->status_pending_p = 1; | |
645 | new_lwp->status_pending = status; | |
646 | } | |
de0d863e | 647 | |
a0aad537 | 648 | #ifdef USE_THREAD_DB |
94c207e0 | 649 | thread_db_notice_clone (event_thr, ptid); |
a0aad537 | 650 | #endif |
86299109 | 651 | |
de0d863e DB |
652 | /* Don't report the event. */ |
653 | return 1; | |
24a09b5f | 654 | } |
c269dbdb DB |
655 | else if (event == PTRACE_EVENT_VFORK_DONE) |
656 | { | |
657 | event_lwp->waitstatus.kind = TARGET_WAITKIND_VFORK_DONE; | |
658 | ||
2e7b624b YQ |
659 | if (event_lwp->bp_reinsert != 0 && can_software_single_step ()) |
660 | { | |
3b9a79ef | 661 | reinsert_single_step_breakpoints (event_thr); |
2e7b624b | 662 | |
3b9a79ef | 663 | gdb_assert (has_single_step_breakpoints (event_thr)); |
2e7b624b YQ |
664 | } |
665 | ||
c269dbdb DB |
666 | /* Report the event. */ |
667 | return 0; | |
668 | } | |
c12a5089 | 669 | else if (event == PTRACE_EVENT_EXEC && cs.report_exec_events) |
94585166 DB |
670 | { |
671 | struct process_info *proc; | |
f27866ba | 672 | std::vector<int> syscalls_to_catch; |
94585166 DB |
673 | ptid_t event_ptid; |
674 | pid_t event_pid; | |
675 | ||
676 | if (debug_threads) | |
677 | { | |
678 | debug_printf ("HEW: Got exec event from LWP %ld\n", | |
679 | lwpid_of (event_thr)); | |
680 | } | |
681 | ||
682 | /* Get the event ptid. */ | |
683 | event_ptid = ptid_of (event_thr); | |
e99b03dc | 684 | event_pid = event_ptid.pid (); |
94585166 | 685 | |
82075af2 | 686 | /* Save the syscall list from the execing process. */ |
94585166 | 687 | proc = get_thread_process (event_thr); |
f27866ba | 688 | syscalls_to_catch = std::move (proc->syscalls_to_catch); |
82075af2 JS |
689 | |
690 | /* Delete the execing process and all its threads. */ | |
d16f3f6c | 691 | mourn (proc); |
94585166 DB |
692 | current_thread = NULL; |
693 | ||
694 | /* Create a new process/lwp/thread. */ | |
695 | proc = linux_add_process (event_pid, 0); | |
696 | event_lwp = add_lwp (event_ptid); | |
697 | event_thr = get_lwp_thread (event_lwp); | |
698 | gdb_assert (current_thread == event_thr); | |
797bcff5 | 699 | arch_setup_thread (event_thr); |
94585166 DB |
700 | |
701 | /* Set the event status. */ | |
702 | event_lwp->waitstatus.kind = TARGET_WAITKIND_EXECD; | |
703 | event_lwp->waitstatus.value.execd_pathname | |
704 | = xstrdup (linux_proc_pid_to_exec_file (lwpid_of (event_thr))); | |
705 | ||
706 | /* Mark the exec status as pending. */ | |
707 | event_lwp->stopped = 1; | |
708 | event_lwp->status_pending_p = 1; | |
709 | event_lwp->status_pending = wstat; | |
710 | event_thr->last_resume_kind = resume_continue; | |
711 | event_thr->last_status.kind = TARGET_WAITKIND_IGNORE; | |
712 | ||
82075af2 JS |
713 | /* Update syscall state in the new lwp, effectively mid-syscall too. */ |
714 | event_lwp->syscall_state = TARGET_WAITKIND_SYSCALL_ENTRY; | |
715 | ||
716 | /* Restore the list to catch. Don't rely on the client, which is free | |
717 | to avoid sending a new list when the architecture doesn't change. | |
718 | Also, for ANY_SYSCALL, the architecture doesn't really matter. */ | |
f27866ba | 719 | proc->syscalls_to_catch = std::move (syscalls_to_catch); |
82075af2 | 720 | |
94585166 DB |
721 | /* Report the event. */ |
722 | *orig_event_lwp = event_lwp; | |
723 | return 0; | |
724 | } | |
de0d863e DB |
725 | |
726 | internal_error (__FILE__, __LINE__, _("unknown ptrace event %d"), event); | |
24a09b5f DJ |
727 | } |
728 | ||
d50171e4 PA |
729 | /* Return the PC as read from the regcache of LWP, without any |
730 | adjustment. */ | |
731 | ||
732 | static CORE_ADDR | |
733 | get_pc (struct lwp_info *lwp) | |
734 | { | |
0bfdf32f | 735 | struct thread_info *saved_thread; |
d50171e4 PA |
736 | struct regcache *regcache; |
737 | CORE_ADDR pc; | |
738 | ||
739 | if (the_low_target.get_pc == NULL) | |
740 | return 0; | |
741 | ||
0bfdf32f GB |
742 | saved_thread = current_thread; |
743 | current_thread = get_lwp_thread (lwp); | |
d50171e4 | 744 | |
0bfdf32f | 745 | regcache = get_thread_regcache (current_thread, 1); |
d50171e4 PA |
746 | pc = (*the_low_target.get_pc) (regcache); |
747 | ||
748 | if (debug_threads) | |
87ce2a04 | 749 | debug_printf ("pc is 0x%lx\n", (long) pc); |
d50171e4 | 750 | |
0bfdf32f | 751 | current_thread = saved_thread; |
d50171e4 PA |
752 | return pc; |
753 | } | |
754 | ||
82075af2 | 755 | /* This function should only be called if LWP got a SYSCALL_SIGTRAP. |
4cc32bec | 756 | Fill *SYSNO with the syscall nr trapped. */ |
82075af2 JS |
757 | |
758 | static void | |
4cc32bec | 759 | get_syscall_trapinfo (struct lwp_info *lwp, int *sysno) |
82075af2 JS |
760 | { |
761 | struct thread_info *saved_thread; | |
762 | struct regcache *regcache; | |
763 | ||
764 | if (the_low_target.get_syscall_trapinfo == NULL) | |
765 | { | |
766 | /* If we cannot get the syscall trapinfo, report an unknown | |
4cc32bec | 767 | system call number. */ |
82075af2 | 768 | *sysno = UNKNOWN_SYSCALL; |
82075af2 JS |
769 | return; |
770 | } | |
771 | ||
772 | saved_thread = current_thread; | |
773 | current_thread = get_lwp_thread (lwp); | |
774 | ||
775 | regcache = get_thread_regcache (current_thread, 1); | |
4cc32bec | 776 | (*the_low_target.get_syscall_trapinfo) (regcache, sysno); |
82075af2 JS |
777 | |
778 | if (debug_threads) | |
4cc32bec | 779 | debug_printf ("get_syscall_trapinfo sysno %d\n", *sysno); |
82075af2 JS |
780 | |
781 | current_thread = saved_thread; | |
782 | } | |
783 | ||
e7ad2f14 | 784 | static int check_stopped_by_watchpoint (struct lwp_info *child); |
0d62e5e8 | 785 | |
e7ad2f14 PA |
786 | /* Called when the LWP stopped for a signal/trap. If it stopped for a |
787 | trap check what caused it (breakpoint, watchpoint, trace, etc.), | |
788 | and save the result in the LWP's stop_reason field. If it stopped | |
789 | for a breakpoint, decrement the PC if necessary on the lwp's | |
790 | architecture. Returns true if we now have the LWP's stop PC. */ | |
0d62e5e8 | 791 | |
582511be | 792 | static int |
e7ad2f14 | 793 | save_stop_reason (struct lwp_info *lwp) |
0d62e5e8 | 794 | { |
582511be PA |
795 | CORE_ADDR pc; |
796 | CORE_ADDR sw_breakpoint_pc; | |
797 | struct thread_info *saved_thread; | |
3e572f71 PA |
798 | #if USE_SIGTRAP_SIGINFO |
799 | siginfo_t siginfo; | |
800 | #endif | |
d50171e4 PA |
801 | |
802 | if (the_low_target.get_pc == NULL) | |
803 | return 0; | |
0d62e5e8 | 804 | |
582511be PA |
805 | pc = get_pc (lwp); |
806 | sw_breakpoint_pc = pc - the_low_target.decr_pc_after_break; | |
d50171e4 | 807 | |
582511be PA |
808 | /* breakpoint_at reads from the current thread. */ |
809 | saved_thread = current_thread; | |
810 | current_thread = get_lwp_thread (lwp); | |
47c0c975 | 811 | |
3e572f71 PA |
812 | #if USE_SIGTRAP_SIGINFO |
813 | if (ptrace (PTRACE_GETSIGINFO, lwpid_of (current_thread), | |
814 | (PTRACE_TYPE_ARG3) 0, &siginfo) == 0) | |
815 | { | |
816 | if (siginfo.si_signo == SIGTRAP) | |
817 | { | |
e7ad2f14 PA |
818 | if (GDB_ARCH_IS_TRAP_BRKPT (siginfo.si_code) |
819 | && GDB_ARCH_IS_TRAP_HWBKPT (siginfo.si_code)) | |
3e572f71 | 820 | { |
e7ad2f14 PA |
821 | /* The si_code is ambiguous on this arch -- check debug |
822 | registers. */ | |
823 | if (!check_stopped_by_watchpoint (lwp)) | |
824 | lwp->stop_reason = TARGET_STOPPED_BY_SW_BREAKPOINT; | |
825 | } | |
826 | else if (GDB_ARCH_IS_TRAP_BRKPT (siginfo.si_code)) | |
827 | { | |
828 | /* If we determine the LWP stopped for a SW breakpoint, | |
829 | trust it. Particularly don't check watchpoint | |
830 | registers, because at least on s390, we'd find | |
831 | stopped-by-watchpoint as long as there's a watchpoint | |
832 | set. */ | |
3e572f71 | 833 | lwp->stop_reason = TARGET_STOPPED_BY_SW_BREAKPOINT; |
3e572f71 | 834 | } |
e7ad2f14 | 835 | else if (GDB_ARCH_IS_TRAP_HWBKPT (siginfo.si_code)) |
3e572f71 | 836 | { |
e7ad2f14 PA |
837 | /* This can indicate either a hardware breakpoint or |
838 | hardware watchpoint. Check debug registers. */ | |
839 | if (!check_stopped_by_watchpoint (lwp)) | |
840 | lwp->stop_reason = TARGET_STOPPED_BY_HW_BREAKPOINT; | |
3e572f71 | 841 | } |
2bf6fb9d PA |
842 | else if (siginfo.si_code == TRAP_TRACE) |
843 | { | |
e7ad2f14 PA |
844 | /* We may have single stepped an instruction that |
845 | triggered a watchpoint. In that case, on some | |
846 | architectures (such as x86), instead of TRAP_HWBKPT, | |
847 | si_code indicates TRAP_TRACE, and we need to check | |
848 | the debug registers separately. */ | |
849 | if (!check_stopped_by_watchpoint (lwp)) | |
850 | lwp->stop_reason = TARGET_STOPPED_BY_SINGLE_STEP; | |
2bf6fb9d | 851 | } |
3e572f71 PA |
852 | } |
853 | } | |
854 | #else | |
582511be PA |
855 | /* We may have just stepped a breakpoint instruction. E.g., in |
856 | non-stop mode, GDB first tells the thread A to step a range, and | |
857 | then the user inserts a breakpoint inside the range. In that | |
8090aef2 PA |
858 | case we need to report the breakpoint PC. */ |
859 | if ((!lwp->stepping || lwp->stop_pc == sw_breakpoint_pc) | |
582511be | 860 | && (*the_low_target.breakpoint_at) (sw_breakpoint_pc)) |
e7ad2f14 PA |
861 | lwp->stop_reason = TARGET_STOPPED_BY_SW_BREAKPOINT; |
862 | ||
863 | if (hardware_breakpoint_inserted_here (pc)) | |
864 | lwp->stop_reason = TARGET_STOPPED_BY_HW_BREAKPOINT; | |
865 | ||
866 | if (lwp->stop_reason == TARGET_STOPPED_BY_NO_REASON) | |
867 | check_stopped_by_watchpoint (lwp); | |
868 | #endif | |
869 | ||
870 | if (lwp->stop_reason == TARGET_STOPPED_BY_SW_BREAKPOINT) | |
582511be PA |
871 | { |
872 | if (debug_threads) | |
873 | { | |
874 | struct thread_info *thr = get_lwp_thread (lwp); | |
875 | ||
876 | debug_printf ("CSBB: %s stopped by software breakpoint\n", | |
877 | target_pid_to_str (ptid_of (thr))); | |
878 | } | |
879 | ||
880 | /* Back up the PC if necessary. */ | |
881 | if (pc != sw_breakpoint_pc) | |
e7ad2f14 | 882 | { |
582511be PA |
883 | struct regcache *regcache |
884 | = get_thread_regcache (current_thread, 1); | |
885 | (*the_low_target.set_pc) (regcache, sw_breakpoint_pc); | |
886 | } | |
887 | ||
e7ad2f14 PA |
888 | /* Update this so we record the correct stop PC below. */ |
889 | pc = sw_breakpoint_pc; | |
582511be | 890 | } |
e7ad2f14 | 891 | else if (lwp->stop_reason == TARGET_STOPPED_BY_HW_BREAKPOINT) |
582511be PA |
892 | { |
893 | if (debug_threads) | |
894 | { | |
895 | struct thread_info *thr = get_lwp_thread (lwp); | |
896 | ||
897 | debug_printf ("CSBB: %s stopped by hardware breakpoint\n", | |
898 | target_pid_to_str (ptid_of (thr))); | |
899 | } | |
e7ad2f14 PA |
900 | } |
901 | else if (lwp->stop_reason == TARGET_STOPPED_BY_WATCHPOINT) | |
902 | { | |
903 | if (debug_threads) | |
904 | { | |
905 | struct thread_info *thr = get_lwp_thread (lwp); | |
47c0c975 | 906 | |
e7ad2f14 PA |
907 | debug_printf ("CSBB: %s stopped by hardware watchpoint\n", |
908 | target_pid_to_str (ptid_of (thr))); | |
909 | } | |
582511be | 910 | } |
e7ad2f14 PA |
911 | else if (lwp->stop_reason == TARGET_STOPPED_BY_SINGLE_STEP) |
912 | { | |
913 | if (debug_threads) | |
914 | { | |
915 | struct thread_info *thr = get_lwp_thread (lwp); | |
582511be | 916 | |
e7ad2f14 PA |
917 | debug_printf ("CSBB: %s stopped by trace\n", |
918 | target_pid_to_str (ptid_of (thr))); | |
919 | } | |
920 | } | |
921 | ||
922 | lwp->stop_pc = pc; | |
582511be | 923 | current_thread = saved_thread; |
e7ad2f14 | 924 | return 1; |
0d62e5e8 | 925 | } |
ce3a066d | 926 | |
b3312d80 | 927 | static struct lwp_info * |
95954743 | 928 | add_lwp (ptid_t ptid) |
611cb4a5 | 929 | { |
54a0b537 | 930 | struct lwp_info *lwp; |
0d62e5e8 | 931 | |
8d749320 | 932 | lwp = XCNEW (struct lwp_info); |
00db26fa PA |
933 | |
934 | lwp->waitstatus.kind = TARGET_WAITKIND_IGNORE; | |
0d62e5e8 | 935 | |
754e3168 AH |
936 | lwp->thread = add_thread (ptid, lwp); |
937 | ||
aa5ca48f | 938 | if (the_low_target.new_thread != NULL) |
34c703da | 939 | the_low_target.new_thread (lwp); |
aa5ca48f | 940 | |
54a0b537 | 941 | return lwp; |
0d62e5e8 | 942 | } |
611cb4a5 | 943 | |
2090129c SDJ |
944 | /* Callback to be used when calling fork_inferior, responsible for |
945 | actually initiating the tracing of the inferior. */ | |
946 | ||
947 | static void | |
948 | linux_ptrace_fun () | |
949 | { | |
950 | if (ptrace (PTRACE_TRACEME, 0, (PTRACE_TYPE_ARG3) 0, | |
951 | (PTRACE_TYPE_ARG4) 0) < 0) | |
50fa3001 | 952 | trace_start_error_with_name ("ptrace"); |
2090129c SDJ |
953 | |
954 | if (setpgid (0, 0) < 0) | |
955 | trace_start_error_with_name ("setpgid"); | |
956 | ||
957 | /* If GDBserver is connected to gdb via stdio, redirect the inferior's | |
958 | stdout to stderr so that inferior i/o doesn't corrupt the connection. | |
959 | Also, redirect stdin to /dev/null. */ | |
960 | if (remote_connection_is_stdio ()) | |
961 | { | |
962 | if (close (0) < 0) | |
963 | trace_start_error_with_name ("close"); | |
964 | if (open ("/dev/null", O_RDONLY) < 0) | |
965 | trace_start_error_with_name ("open"); | |
966 | if (dup2 (2, 1) < 0) | |
967 | trace_start_error_with_name ("dup2"); | |
968 | if (write (2, "stdin/stdout redirected\n", | |
969 | sizeof ("stdin/stdout redirected\n") - 1) < 0) | |
970 | { | |
971 | /* Errors ignored. */; | |
972 | } | |
973 | } | |
974 | } | |
975 | ||
da6d8c04 | 976 | /* Start an inferior process and returns its pid. |
2090129c SDJ |
977 | PROGRAM is the name of the program to be started, and PROGRAM_ARGS |
978 | are its arguments. */ | |
da6d8c04 | 979 | |
15295543 TBA |
980 | int |
981 | linux_process_target::create_inferior (const char *program, | |
982 | const std::vector<char *> &program_args) | |
da6d8c04 | 983 | { |
c12a5089 | 984 | client_state &cs = get_client_state (); |
a6dbe5df | 985 | struct lwp_info *new_lwp; |
da6d8c04 | 986 | int pid; |
95954743 | 987 | ptid_t ptid; |
03583c20 | 988 | |
41272101 TT |
989 | { |
990 | maybe_disable_address_space_randomization restore_personality | |
c12a5089 | 991 | (cs.disable_randomization); |
41272101 TT |
992 | std::string str_program_args = stringify_argv (program_args); |
993 | ||
994 | pid = fork_inferior (program, | |
995 | str_program_args.c_str (), | |
996 | get_environ ()->envp (), linux_ptrace_fun, | |
997 | NULL, NULL, NULL, NULL); | |
998 | } | |
03583c20 | 999 | |
55d7b841 | 1000 | linux_add_process (pid, 0); |
95954743 | 1001 | |
fd79271b | 1002 | ptid = ptid_t (pid, pid, 0); |
95954743 | 1003 | new_lwp = add_lwp (ptid); |
a6dbe5df | 1004 | new_lwp->must_set_ptrace_flags = 1; |
611cb4a5 | 1005 | |
2090129c SDJ |
1006 | post_fork_inferior (pid, program); |
1007 | ||
a9fa9f7d | 1008 | return pid; |
da6d8c04 DJ |
1009 | } |
1010 | ||
ece66d65 JS |
1011 | /* Implement the post_create_inferior target_ops method. */ |
1012 | ||
6dee9afb TBA |
1013 | void |
1014 | linux_process_target::post_create_inferior () | |
ece66d65 JS |
1015 | { |
1016 | struct lwp_info *lwp = get_thread_lwp (current_thread); | |
1017 | ||
797bcff5 | 1018 | low_arch_setup (); |
ece66d65 JS |
1019 | |
1020 | if (lwp->must_set_ptrace_flags) | |
1021 | { | |
1022 | struct process_info *proc = current_process (); | |
1023 | int options = linux_low_ptrace_options (proc->attached); | |
1024 | ||
1025 | linux_enable_event_reporting (lwpid_of (current_thread), options); | |
1026 | lwp->must_set_ptrace_flags = 0; | |
1027 | } | |
1028 | } | |
1029 | ||
8784d563 PA |
1030 | /* Attach to an inferior process. Returns 0 on success, ERRNO on |
1031 | error. */ | |
da6d8c04 | 1032 | |
7ae1a6a6 PA |
1033 | int |
1034 | linux_attach_lwp (ptid_t ptid) | |
da6d8c04 | 1035 | { |
54a0b537 | 1036 | struct lwp_info *new_lwp; |
e38504b3 | 1037 | int lwpid = ptid.lwp (); |
611cb4a5 | 1038 | |
b8e1b30e | 1039 | if (ptrace (PTRACE_ATTACH, lwpid, (PTRACE_TYPE_ARG3) 0, (PTRACE_TYPE_ARG4) 0) |
56f7af9c | 1040 | != 0) |
7ae1a6a6 | 1041 | return errno; |
24a09b5f | 1042 | |
b3312d80 | 1043 | new_lwp = add_lwp (ptid); |
0d62e5e8 | 1044 | |
a6dbe5df PA |
1045 | /* We need to wait for SIGSTOP before being able to make the next |
1046 | ptrace call on this LWP. */ | |
1047 | new_lwp->must_set_ptrace_flags = 1; | |
1048 | ||
644cebc9 | 1049 | if (linux_proc_pid_is_stopped (lwpid)) |
c14d7ab2 PA |
1050 | { |
1051 | if (debug_threads) | |
87ce2a04 | 1052 | debug_printf ("Attached to a stopped process\n"); |
c14d7ab2 PA |
1053 | |
1054 | /* The process is definitely stopped. It is in a job control | |
1055 | stop, unless the kernel predates the TASK_STOPPED / | |
1056 | TASK_TRACED distinction, in which case it might be in a | |
1057 | ptrace stop. Make sure it is in a ptrace stop; from there we | |
1058 | can kill it, signal it, et cetera. | |
1059 | ||
1060 | First make sure there is a pending SIGSTOP. Since we are | |
1061 | already attached, the process can not transition from stopped | |
1062 | to running without a PTRACE_CONT; so we know this signal will | |
1063 | go into the queue. The SIGSTOP generated by PTRACE_ATTACH is | |
1064 | probably already in the queue (unless this kernel is old | |
1065 | enough to use TASK_STOPPED for ptrace stops); but since | |
1066 | SIGSTOP is not an RT signal, it can only be queued once. */ | |
1067 | kill_lwp (lwpid, SIGSTOP); | |
1068 | ||
1069 | /* Finally, resume the stopped process. This will deliver the | |
1070 | SIGSTOP (or a higher priority signal, just like normal | |
1071 | PTRACE_ATTACH), which we'll catch later on. */ | |
b8e1b30e | 1072 | ptrace (PTRACE_CONT, lwpid, (PTRACE_TYPE_ARG3) 0, (PTRACE_TYPE_ARG4) 0); |
c14d7ab2 PA |
1073 | } |
1074 | ||
0d62e5e8 | 1075 | /* The next time we wait for this LWP we'll see a SIGSTOP as PTRACE_ATTACH |
0e21c1ec DE |
1076 | brings it to a halt. |
1077 | ||
1078 | There are several cases to consider here: | |
1079 | ||
1080 | 1) gdbserver has already attached to the process and is being notified | |
1b3f6016 | 1081 | of a new thread that is being created. |
d50171e4 PA |
1082 | In this case we should ignore that SIGSTOP and resume the |
1083 | process. This is handled below by setting stop_expected = 1, | |
8336d594 | 1084 | and the fact that add_thread sets last_resume_kind == |
d50171e4 | 1085 | resume_continue. |
0e21c1ec DE |
1086 | |
1087 | 2) This is the first thread (the process thread), and we're attaching | |
1b3f6016 PA |
1088 | to it via attach_inferior. |
1089 | In this case we want the process thread to stop. | |
d50171e4 PA |
1090 | This is handled by having linux_attach set last_resume_kind == |
1091 | resume_stop after we return. | |
e3deef73 LM |
1092 | |
1093 | If the pid we are attaching to is also the tgid, we attach to and | |
1094 | stop all the existing threads. Otherwise, we attach to pid and | |
1095 | ignore any other threads in the same group as this pid. | |
0e21c1ec DE |
1096 | |
1097 | 3) GDB is connecting to gdbserver and is requesting an enumeration of all | |
1b3f6016 PA |
1098 | existing threads. |
1099 | In this case we want the thread to stop. | |
1100 | FIXME: This case is currently not properly handled. | |
1101 | We should wait for the SIGSTOP but don't. Things work apparently | |
1102 | because enough time passes between when we ptrace (ATTACH) and when | |
1103 | gdb makes the next ptrace call on the thread. | |
0d62e5e8 DJ |
1104 | |
1105 | On the other hand, if we are currently trying to stop all threads, we | |
1106 | should treat the new thread as if we had sent it a SIGSTOP. This works | |
54a0b537 | 1107 | because we are guaranteed that the add_lwp call above added us to the |
0e21c1ec DE |
1108 | end of the list, and so the new thread has not yet reached |
1109 | wait_for_sigstop (but will). */ | |
d50171e4 | 1110 | new_lwp->stop_expected = 1; |
0d62e5e8 | 1111 | |
7ae1a6a6 | 1112 | return 0; |
95954743 PA |
1113 | } |
1114 | ||
8784d563 PA |
1115 | /* Callback for linux_proc_attach_tgid_threads. Attach to PTID if not |
1116 | already attached. Returns true if a new LWP is found, false | |
1117 | otherwise. */ | |
1118 | ||
1119 | static int | |
1120 | attach_proc_task_lwp_callback (ptid_t ptid) | |
1121 | { | |
1122 | /* Is this a new thread? */ | |
1123 | if (find_thread_ptid (ptid) == NULL) | |
1124 | { | |
e38504b3 | 1125 | int lwpid = ptid.lwp (); |
8784d563 PA |
1126 | int err; |
1127 | ||
1128 | if (debug_threads) | |
1129 | debug_printf ("Found new lwp %d\n", lwpid); | |
1130 | ||
1131 | err = linux_attach_lwp (ptid); | |
1132 | ||
1133 | /* Be quiet if we simply raced with the thread exiting. EPERM | |
1134 | is returned if the thread's task still exists, and is marked | |
1135 | as exited or zombie, as well as other conditions, so in that | |
1136 | case, confirm the status in /proc/PID/status. */ | |
1137 | if (err == ESRCH | |
1138 | || (err == EPERM && linux_proc_pid_is_gone (lwpid))) | |
1139 | { | |
1140 | if (debug_threads) | |
1141 | { | |
1142 | debug_printf ("Cannot attach to lwp %d: " | |
1143 | "thread is gone (%d: %s)\n", | |
6d91ce9a | 1144 | lwpid, err, safe_strerror (err)); |
8784d563 PA |
1145 | } |
1146 | } | |
1147 | else if (err != 0) | |
1148 | { | |
4d9b86e1 | 1149 | std::string reason |
50fa3001 | 1150 | = linux_ptrace_attach_fail_reason_string (ptid, err); |
4d9b86e1 SM |
1151 | |
1152 | warning (_("Cannot attach to lwp %d: %s"), lwpid, reason.c_str ()); | |
8784d563 PA |
1153 | } |
1154 | ||
1155 | return 1; | |
1156 | } | |
1157 | return 0; | |
1158 | } | |
1159 | ||
500c1d85 PA |
1160 | static void async_file_mark (void); |
1161 | ||
e3deef73 LM |
1162 | /* Attach to PID. If PID is the tgid, attach to it and all |
1163 | of its threads. */ | |
1164 | ||
ef03dad8 TBA |
1165 | int |
1166 | linux_process_target::attach (unsigned long pid) | |
0d62e5e8 | 1167 | { |
500c1d85 PA |
1168 | struct process_info *proc; |
1169 | struct thread_info *initial_thread; | |
fd79271b | 1170 | ptid_t ptid = ptid_t (pid, pid, 0); |
7ae1a6a6 PA |
1171 | int err; |
1172 | ||
df0da8a2 AH |
1173 | proc = linux_add_process (pid, 1); |
1174 | ||
e3deef73 LM |
1175 | /* Attach to PID. We will check for other threads |
1176 | soon. */ | |
7ae1a6a6 PA |
1177 | err = linux_attach_lwp (ptid); |
1178 | if (err != 0) | |
4d9b86e1 | 1179 | { |
df0da8a2 | 1180 | remove_process (proc); |
4d9b86e1 | 1181 | |
50fa3001 SDJ |
1182 | std::string reason = linux_ptrace_attach_fail_reason_string (ptid, err); |
1183 | error ("Cannot attach to process %ld: %s", pid, reason.c_str ()); | |
4d9b86e1 | 1184 | } |
7ae1a6a6 | 1185 | |
500c1d85 PA |
1186 | /* Don't ignore the initial SIGSTOP if we just attached to this |
1187 | process. It will be collected by wait shortly. */ | |
fd79271b | 1188 | initial_thread = find_thread_ptid (ptid_t (pid, pid, 0)); |
500c1d85 | 1189 | initial_thread->last_resume_kind = resume_stop; |
0d62e5e8 | 1190 | |
8784d563 PA |
1191 | /* We must attach to every LWP. If /proc is mounted, use that to |
1192 | find them now. On the one hand, the inferior may be using raw | |
1193 | clone instead of using pthreads. On the other hand, even if it | |
1194 | is using pthreads, GDB may not be connected yet (thread_db needs | |
1195 | to do symbol lookups, through qSymbol). Also, thread_db walks | |
1196 | structures in the inferior's address space to find the list of | |
1197 | threads/LWPs, and those structures may well be corrupted. Note | |
1198 | that once thread_db is loaded, we'll still use it to list threads | |
1199 | and associate pthread info with each LWP. */ | |
1200 | linux_proc_attach_tgid_threads (pid, attach_proc_task_lwp_callback); | |
500c1d85 PA |
1201 | |
1202 | /* GDB will shortly read the xml target description for this | |
1203 | process, to figure out the process' architecture. But the target | |
1204 | description is only filled in when the first process/thread in | |
1205 | the thread group reports its initial PTRACE_ATTACH SIGSTOP. Do | |
1206 | that now, otherwise, if GDB is fast enough, it could read the | |
1207 | target description _before_ that initial stop. */ | |
1208 | if (non_stop) | |
1209 | { | |
1210 | struct lwp_info *lwp; | |
1211 | int wstat, lwpid; | |
f2907e49 | 1212 | ptid_t pid_ptid = ptid_t (pid); |
500c1d85 | 1213 | |
d16f3f6c | 1214 | lwpid = wait_for_event_filtered (pid_ptid, pid_ptid, &wstat, __WALL); |
500c1d85 PA |
1215 | gdb_assert (lwpid > 0); |
1216 | ||
f2907e49 | 1217 | lwp = find_lwp_pid (ptid_t (lwpid)); |
500c1d85 PA |
1218 | |
1219 | if (!WIFSTOPPED (wstat) || WSTOPSIG (wstat) != SIGSTOP) | |
1220 | { | |
1221 | lwp->status_pending_p = 1; | |
1222 | lwp->status_pending = wstat; | |
1223 | } | |
1224 | ||
1225 | initial_thread->last_resume_kind = resume_continue; | |
1226 | ||
1227 | async_file_mark (); | |
1228 | ||
1229 | gdb_assert (proc->tdesc != NULL); | |
1230 | } | |
1231 | ||
95954743 PA |
1232 | return 0; |
1233 | } | |
1234 | ||
95954743 | 1235 | static int |
e4eb0dec | 1236 | last_thread_of_process_p (int pid) |
95954743 | 1237 | { |
e4eb0dec | 1238 | bool seen_one = false; |
95954743 | 1239 | |
da4ae14a | 1240 | thread_info *thread = find_thread (pid, [&] (thread_info *thr_arg) |
95954743 | 1241 | { |
e4eb0dec SM |
1242 | if (!seen_one) |
1243 | { | |
1244 | /* This is the first thread of this process we see. */ | |
1245 | seen_one = true; | |
1246 | return false; | |
1247 | } | |
1248 | else | |
1249 | { | |
1250 | /* This is the second thread of this process we see. */ | |
1251 | return true; | |
1252 | } | |
1253 | }); | |
da6d8c04 | 1254 | |
e4eb0dec | 1255 | return thread == NULL; |
95954743 PA |
1256 | } |
1257 | ||
da84f473 PA |
1258 | /* Kill LWP. */ |
1259 | ||
1260 | static void | |
1261 | linux_kill_one_lwp (struct lwp_info *lwp) | |
1262 | { | |
d86d4aaf DE |
1263 | struct thread_info *thr = get_lwp_thread (lwp); |
1264 | int pid = lwpid_of (thr); | |
da84f473 PA |
1265 | |
1266 | /* PTRACE_KILL is unreliable. After stepping into a signal handler, | |
1267 | there is no signal context, and ptrace(PTRACE_KILL) (or | |
1268 | ptrace(PTRACE_CONT, SIGKILL), pretty much the same) acts like | |
1269 | ptrace(CONT, pid, 0,0) and just resumes the tracee. A better | |
1270 | alternative is to kill with SIGKILL. We only need one SIGKILL | |
1271 | per process, not one for each thread. But since we still support | |
4a6ed09b PA |
1272 | support debugging programs using raw clone without CLONE_THREAD, |
1273 | we send one for each thread. For years, we used PTRACE_KILL | |
1274 | only, so we're being a bit paranoid about some old kernels where | |
1275 | PTRACE_KILL might work better (dubious if there are any such, but | |
1276 | that's why it's paranoia), so we try SIGKILL first, PTRACE_KILL | |
1277 | second, and so we're fine everywhere. */ | |
da84f473 PA |
1278 | |
1279 | errno = 0; | |
69ff6be5 | 1280 | kill_lwp (pid, SIGKILL); |
da84f473 | 1281 | if (debug_threads) |
ce9e3fe7 PA |
1282 | { |
1283 | int save_errno = errno; | |
1284 | ||
1285 | debug_printf ("LKL: kill_lwp (SIGKILL) %s, 0, 0 (%s)\n", | |
1286 | target_pid_to_str (ptid_of (thr)), | |
6d91ce9a | 1287 | save_errno ? safe_strerror (save_errno) : "OK"); |
ce9e3fe7 | 1288 | } |
da84f473 PA |
1289 | |
1290 | errno = 0; | |
b8e1b30e | 1291 | ptrace (PTRACE_KILL, pid, (PTRACE_TYPE_ARG3) 0, (PTRACE_TYPE_ARG4) 0); |
da84f473 | 1292 | if (debug_threads) |
ce9e3fe7 PA |
1293 | { |
1294 | int save_errno = errno; | |
1295 | ||
1296 | debug_printf ("LKL: PTRACE_KILL %s, 0, 0 (%s)\n", | |
1297 | target_pid_to_str (ptid_of (thr)), | |
6d91ce9a | 1298 | save_errno ? safe_strerror (save_errno) : "OK"); |
ce9e3fe7 | 1299 | } |
da84f473 PA |
1300 | } |
1301 | ||
e76126e8 PA |
1302 | /* Kill LWP and wait for it to die. */ |
1303 | ||
1304 | static void | |
1305 | kill_wait_lwp (struct lwp_info *lwp) | |
1306 | { | |
1307 | struct thread_info *thr = get_lwp_thread (lwp); | |
e99b03dc | 1308 | int pid = ptid_of (thr).pid (); |
e38504b3 | 1309 | int lwpid = ptid_of (thr).lwp (); |
e76126e8 PA |
1310 | int wstat; |
1311 | int res; | |
1312 | ||
1313 | if (debug_threads) | |
1314 | debug_printf ("kwl: killing lwp %d, for pid: %d\n", lwpid, pid); | |
1315 | ||
1316 | do | |
1317 | { | |
1318 | linux_kill_one_lwp (lwp); | |
1319 | ||
1320 | /* Make sure it died. Notes: | |
1321 | ||
1322 | - The loop is most likely unnecessary. | |
1323 | ||
d16f3f6c | 1324 | - We don't use wait_for_event as that could delete lwps |
e76126e8 PA |
1325 | while we're iterating over them. We're not interested in |
1326 | any pending status at this point, only in making sure all | |
1327 | wait status on the kernel side are collected until the | |
1328 | process is reaped. | |
1329 | ||
1330 | - We don't use __WALL here as the __WALL emulation relies on | |
1331 | SIGCHLD, and killing a stopped process doesn't generate | |
1332 | one, nor an exit status. | |
1333 | */ | |
1334 | res = my_waitpid (lwpid, &wstat, 0); | |
1335 | if (res == -1 && errno == ECHILD) | |
1336 | res = my_waitpid (lwpid, &wstat, __WCLONE); | |
1337 | } while (res > 0 && WIFSTOPPED (wstat)); | |
1338 | ||
586b02a9 PA |
1339 | /* Even if it was stopped, the child may have already disappeared. |
1340 | E.g., if it was killed by SIGKILL. */ | |
1341 | if (res < 0 && errno != ECHILD) | |
1342 | perror_with_name ("kill_wait_lwp"); | |
e76126e8 PA |
1343 | } |
1344 | ||
578290ec | 1345 | /* Callback for `for_each_thread'. Kills an lwp of a given process, |
da84f473 | 1346 | except the leader. */ |
95954743 | 1347 | |
578290ec SM |
1348 | static void |
1349 | kill_one_lwp_callback (thread_info *thread, int pid) | |
da6d8c04 | 1350 | { |
54a0b537 | 1351 | struct lwp_info *lwp = get_thread_lwp (thread); |
0d62e5e8 | 1352 | |
fd500816 DJ |
1353 | /* We avoid killing the first thread here, because of a Linux kernel (at |
1354 | least 2.6.0-test7 through 2.6.8-rc4) bug; if we kill the parent before | |
1355 | the children get a chance to be reaped, it will remain a zombie | |
1356 | forever. */ | |
95954743 | 1357 | |
d86d4aaf | 1358 | if (lwpid_of (thread) == pid) |
95954743 PA |
1359 | { |
1360 | if (debug_threads) | |
87ce2a04 | 1361 | debug_printf ("lkop: is last of process %s\n", |
9c80ecd6 | 1362 | target_pid_to_str (thread->id)); |
578290ec | 1363 | return; |
95954743 | 1364 | } |
fd500816 | 1365 | |
e76126e8 | 1366 | kill_wait_lwp (lwp); |
da6d8c04 DJ |
1367 | } |
1368 | ||
c6885a57 TBA |
1369 | int |
1370 | linux_process_target::kill (process_info *process) | |
0d62e5e8 | 1371 | { |
a780ef4f | 1372 | int pid = process->pid; |
9d606399 | 1373 | |
f9e39928 PA |
1374 | /* If we're killing a running inferior, make sure it is stopped |
1375 | first, as PTRACE_KILL will not work otherwise. */ | |
7984d532 | 1376 | stop_all_lwps (0, NULL); |
f9e39928 | 1377 | |
578290ec SM |
1378 | for_each_thread (pid, [&] (thread_info *thread) |
1379 | { | |
1380 | kill_one_lwp_callback (thread, pid); | |
1381 | }); | |
fd500816 | 1382 | |
54a0b537 | 1383 | /* See the comment in linux_kill_one_lwp. We did not kill the first |
fd500816 | 1384 | thread in the list, so do so now. */ |
a780ef4f | 1385 | lwp_info *lwp = find_lwp_pid (ptid_t (pid)); |
bd99dc85 | 1386 | |
784867a5 | 1387 | if (lwp == NULL) |
fd500816 | 1388 | { |
784867a5 | 1389 | if (debug_threads) |
d86d4aaf DE |
1390 | debug_printf ("lk_1: cannot find lwp for pid: %d\n", |
1391 | pid); | |
784867a5 JK |
1392 | } |
1393 | else | |
e76126e8 | 1394 | kill_wait_lwp (lwp); |
2d717e4f | 1395 | |
8adb37b9 | 1396 | mourn (process); |
f9e39928 PA |
1397 | |
1398 | /* Since we presently can only stop all lwps of all processes, we | |
1399 | need to unstop lwps of other processes. */ | |
7984d532 | 1400 | unstop_all_lwps (0, NULL); |
95954743 | 1401 | return 0; |
0d62e5e8 DJ |
1402 | } |
1403 | ||
9b224c5e PA |
1404 | /* Get pending signal of THREAD, for detaching purposes. This is the |
1405 | signal the thread last stopped for, which we need to deliver to the | |
1406 | thread when detaching, otherwise, it'd be suppressed/lost. */ | |
1407 | ||
1408 | static int | |
1409 | get_detach_signal (struct thread_info *thread) | |
1410 | { | |
c12a5089 | 1411 | client_state &cs = get_client_state (); |
a493e3e2 | 1412 | enum gdb_signal signo = GDB_SIGNAL_0; |
9b224c5e PA |
1413 | int status; |
1414 | struct lwp_info *lp = get_thread_lwp (thread); | |
1415 | ||
1416 | if (lp->status_pending_p) | |
1417 | status = lp->status_pending; | |
1418 | else | |
1419 | { | |
1420 | /* If the thread had been suspended by gdbserver, and it stopped | |
1421 | cleanly, then it'll have stopped with SIGSTOP. But we don't | |
1422 | want to deliver that SIGSTOP. */ | |
1423 | if (thread->last_status.kind != TARGET_WAITKIND_STOPPED | |
a493e3e2 | 1424 | || thread->last_status.value.sig == GDB_SIGNAL_0) |
9b224c5e PA |
1425 | return 0; |
1426 | ||
1427 | /* Otherwise, we may need to deliver the signal we | |
1428 | intercepted. */ | |
1429 | status = lp->last_status; | |
1430 | } | |
1431 | ||
1432 | if (!WIFSTOPPED (status)) | |
1433 | { | |
1434 | if (debug_threads) | |
87ce2a04 | 1435 | debug_printf ("GPS: lwp %s hasn't stopped: no pending signal\n", |
d86d4aaf | 1436 | target_pid_to_str (ptid_of (thread))); |
9b224c5e PA |
1437 | return 0; |
1438 | } | |
1439 | ||
1440 | /* Extended wait statuses aren't real SIGTRAPs. */ | |
89a5711c | 1441 | if (WSTOPSIG (status) == SIGTRAP && linux_is_extended_waitstatus (status)) |
9b224c5e PA |
1442 | { |
1443 | if (debug_threads) | |
87ce2a04 DE |
1444 | debug_printf ("GPS: lwp %s had stopped with extended " |
1445 | "status: no pending signal\n", | |
d86d4aaf | 1446 | target_pid_to_str (ptid_of (thread))); |
9b224c5e PA |
1447 | return 0; |
1448 | } | |
1449 | ||
2ea28649 | 1450 | signo = gdb_signal_from_host (WSTOPSIG (status)); |
9b224c5e | 1451 | |
c12a5089 | 1452 | if (cs.program_signals_p && !cs.program_signals[signo]) |
9b224c5e PA |
1453 | { |
1454 | if (debug_threads) | |
87ce2a04 | 1455 | debug_printf ("GPS: lwp %s had signal %s, but it is in nopass state\n", |
d86d4aaf | 1456 | target_pid_to_str (ptid_of (thread)), |
87ce2a04 | 1457 | gdb_signal_to_string (signo)); |
9b224c5e PA |
1458 | return 0; |
1459 | } | |
c12a5089 | 1460 | else if (!cs.program_signals_p |
9b224c5e PA |
1461 | /* If we have no way to know which signals GDB does not |
1462 | want to have passed to the program, assume | |
1463 | SIGTRAP/SIGINT, which is GDB's default. */ | |
a493e3e2 | 1464 | && (signo == GDB_SIGNAL_TRAP || signo == GDB_SIGNAL_INT)) |
9b224c5e PA |
1465 | { |
1466 | if (debug_threads) | |
87ce2a04 DE |
1467 | debug_printf ("GPS: lwp %s had signal %s, " |
1468 | "but we don't know if we should pass it. " | |
1469 | "Default to not.\n", | |
d86d4aaf | 1470 | target_pid_to_str (ptid_of (thread)), |
87ce2a04 | 1471 | gdb_signal_to_string (signo)); |
9b224c5e PA |
1472 | return 0; |
1473 | } | |
1474 | else | |
1475 | { | |
1476 | if (debug_threads) | |
87ce2a04 | 1477 | debug_printf ("GPS: lwp %s has pending signal %s: delivering it.\n", |
d86d4aaf | 1478 | target_pid_to_str (ptid_of (thread)), |
87ce2a04 | 1479 | gdb_signal_to_string (signo)); |
9b224c5e PA |
1480 | |
1481 | return WSTOPSIG (status); | |
1482 | } | |
1483 | } | |
1484 | ||
ced2dffb PA |
1485 | /* Detach from LWP. */ |
1486 | ||
1487 | static void | |
1488 | linux_detach_one_lwp (struct lwp_info *lwp) | |
6ad8ae5c | 1489 | { |
ced2dffb | 1490 | struct thread_info *thread = get_lwp_thread (lwp); |
9b224c5e | 1491 | int sig; |
ced2dffb | 1492 | int lwpid; |
6ad8ae5c | 1493 | |
9b224c5e | 1494 | /* If there is a pending SIGSTOP, get rid of it. */ |
54a0b537 | 1495 | if (lwp->stop_expected) |
ae13219e | 1496 | { |
9b224c5e | 1497 | if (debug_threads) |
87ce2a04 | 1498 | debug_printf ("Sending SIGCONT to %s\n", |
d86d4aaf | 1499 | target_pid_to_str (ptid_of (thread))); |
9b224c5e | 1500 | |
d86d4aaf | 1501 | kill_lwp (lwpid_of (thread), SIGCONT); |
54a0b537 | 1502 | lwp->stop_expected = 0; |
ae13219e DJ |
1503 | } |
1504 | ||
9b224c5e PA |
1505 | /* Pass on any pending signal for this thread. */ |
1506 | sig = get_detach_signal (thread); | |
1507 | ||
ced2dffb PA |
1508 | /* Preparing to resume may try to write registers, and fail if the |
1509 | lwp is zombie. If that happens, ignore the error. We'll handle | |
1510 | it below, when detach fails with ESRCH. */ | |
a70b8144 | 1511 | try |
ced2dffb PA |
1512 | { |
1513 | /* Flush any pending changes to the process's registers. */ | |
1514 | regcache_invalidate_thread (thread); | |
1515 | ||
1516 | /* Finally, let it resume. */ | |
1517 | if (the_low_target.prepare_to_resume != NULL) | |
1518 | the_low_target.prepare_to_resume (lwp); | |
1519 | } | |
230d2906 | 1520 | catch (const gdb_exception_error &ex) |
ced2dffb PA |
1521 | { |
1522 | if (!check_ptrace_stopped_lwp_gone (lwp)) | |
eedc3f4f | 1523 | throw; |
ced2dffb | 1524 | } |
ced2dffb PA |
1525 | |
1526 | lwpid = lwpid_of (thread); | |
1527 | if (ptrace (PTRACE_DETACH, lwpid, (PTRACE_TYPE_ARG3) 0, | |
b8e1b30e | 1528 | (PTRACE_TYPE_ARG4) (long) sig) < 0) |
ced2dffb PA |
1529 | { |
1530 | int save_errno = errno; | |
1531 | ||
1532 | /* We know the thread exists, so ESRCH must mean the lwp is | |
1533 | zombie. This can happen if one of the already-detached | |
1534 | threads exits the whole thread group. In that case we're | |
1535 | still attached, and must reap the lwp. */ | |
1536 | if (save_errno == ESRCH) | |
1537 | { | |
1538 | int ret, status; | |
1539 | ||
1540 | ret = my_waitpid (lwpid, &status, __WALL); | |
1541 | if (ret == -1) | |
1542 | { | |
1543 | warning (_("Couldn't reap LWP %d while detaching: %s"), | |
6d91ce9a | 1544 | lwpid, safe_strerror (errno)); |
ced2dffb PA |
1545 | } |
1546 | else if (!WIFEXITED (status) && !WIFSIGNALED (status)) | |
1547 | { | |
1548 | warning (_("Reaping LWP %d while detaching " | |
1549 | "returned unexpected status 0x%x"), | |
1550 | lwpid, status); | |
1551 | } | |
1552 | } | |
1553 | else | |
1554 | { | |
1555 | error (_("Can't detach %s: %s"), | |
1556 | target_pid_to_str (ptid_of (thread)), | |
6d91ce9a | 1557 | safe_strerror (save_errno)); |
ced2dffb PA |
1558 | } |
1559 | } | |
1560 | else if (debug_threads) | |
1561 | { | |
1562 | debug_printf ("PTRACE_DETACH (%s, %s, 0) (OK)\n", | |
1563 | target_pid_to_str (ptid_of (thread)), | |
1564 | strsignal (sig)); | |
1565 | } | |
bd99dc85 PA |
1566 | |
1567 | delete_lwp (lwp); | |
ced2dffb PA |
1568 | } |
1569 | ||
798a38e8 | 1570 | /* Callback for for_each_thread. Detaches from non-leader threads of a |
ced2dffb PA |
1571 | given process. */ |
1572 | ||
798a38e8 SM |
1573 | static void |
1574 | linux_detach_lwp_callback (thread_info *thread) | |
ced2dffb | 1575 | { |
ced2dffb PA |
1576 | /* We don't actually detach from the thread group leader just yet. |
1577 | If the thread group exits, we must reap the zombie clone lwps | |
1578 | before we're able to reap the leader. */ | |
798a38e8 SM |
1579 | if (thread->id.pid () == thread->id.lwp ()) |
1580 | return; | |
ced2dffb | 1581 | |
798a38e8 | 1582 | lwp_info *lwp = get_thread_lwp (thread); |
ced2dffb | 1583 | linux_detach_one_lwp (lwp); |
6ad8ae5c DJ |
1584 | } |
1585 | ||
9061c9cf TBA |
1586 | int |
1587 | linux_process_target::detach (process_info *process) | |
95954743 | 1588 | { |
ced2dffb | 1589 | struct lwp_info *main_lwp; |
95954743 | 1590 | |
863d01bd PA |
1591 | /* As there's a step over already in progress, let it finish first, |
1592 | otherwise nesting a stabilize_threads operation on top gets real | |
1593 | messy. */ | |
1594 | complete_ongoing_step_over (); | |
1595 | ||
f9e39928 | 1596 | /* Stop all threads before detaching. First, ptrace requires that |
30baf67b | 1597 | the thread is stopped to successfully detach. Second, thread_db |
f9e39928 PA |
1598 | may need to uninstall thread event breakpoints from memory, which |
1599 | only works with a stopped process anyway. */ | |
7984d532 | 1600 | stop_all_lwps (0, NULL); |
f9e39928 | 1601 | |
ca5c370d | 1602 | #ifdef USE_THREAD_DB |
8336d594 | 1603 | thread_db_detach (process); |
ca5c370d PA |
1604 | #endif |
1605 | ||
fa593d66 | 1606 | /* Stabilize threads (move out of jump pads). */ |
5c9eb2f2 | 1607 | target_stabilize_threads (); |
fa593d66 | 1608 | |
ced2dffb PA |
1609 | /* Detach from the clone lwps first. If the thread group exits just |
1610 | while we're detaching, we must reap the clone lwps before we're | |
1611 | able to reap the leader. */ | |
ef2ddb33 | 1612 | for_each_thread (process->pid, linux_detach_lwp_callback); |
ced2dffb | 1613 | |
ef2ddb33 | 1614 | main_lwp = find_lwp_pid (ptid_t (process->pid)); |
ced2dffb | 1615 | linux_detach_one_lwp (main_lwp); |
8336d594 | 1616 | |
8adb37b9 | 1617 | mourn (process); |
f9e39928 PA |
1618 | |
1619 | /* Since we presently can only stop all lwps of all processes, we | |
1620 | need to unstop lwps of other processes. */ | |
7984d532 | 1621 | unstop_all_lwps (0, NULL); |
f9e39928 PA |
1622 | return 0; |
1623 | } | |
1624 | ||
1625 | /* Remove all LWPs that belong to process PROC from the lwp list. */ | |
1626 | ||
8adb37b9 TBA |
1627 | void |
1628 | linux_process_target::mourn (process_info *process) | |
8336d594 PA |
1629 | { |
1630 | struct process_info_private *priv; | |
1631 | ||
1632 | #ifdef USE_THREAD_DB | |
1633 | thread_db_mourn (process); | |
1634 | #endif | |
1635 | ||
6b2a85da SM |
1636 | for_each_thread (process->pid, [] (thread_info *thread) |
1637 | { | |
1638 | delete_lwp (get_thread_lwp (thread)); | |
1639 | }); | |
f9e39928 | 1640 | |
8336d594 | 1641 | /* Freeing all private data. */ |
fe978cb0 | 1642 | priv = process->priv; |
04ec7890 SM |
1643 | if (the_low_target.delete_process != NULL) |
1644 | the_low_target.delete_process (priv->arch_private); | |
1645 | else | |
1646 | gdb_assert (priv->arch_private == NULL); | |
8336d594 | 1647 | free (priv); |
fe978cb0 | 1648 | process->priv = NULL; |
505106cd PA |
1649 | |
1650 | remove_process (process); | |
8336d594 PA |
1651 | } |
1652 | ||
95a49a39 TBA |
1653 | void |
1654 | linux_process_target::join (int pid) | |
444d6139 | 1655 | { |
444d6139 PA |
1656 | int status, ret; |
1657 | ||
1658 | do { | |
d105de22 | 1659 | ret = my_waitpid (pid, &status, 0); |
444d6139 PA |
1660 | if (WIFEXITED (status) || WIFSIGNALED (status)) |
1661 | break; | |
1662 | } while (ret != -1 || errno != ECHILD); | |
1663 | } | |
1664 | ||
13d3d99b TBA |
1665 | /* Return true if the given thread is still alive. */ |
1666 | ||
1667 | bool | |
1668 | linux_process_target::thread_alive (ptid_t ptid) | |
0d62e5e8 | 1669 | { |
95954743 PA |
1670 | struct lwp_info *lwp = find_lwp_pid (ptid); |
1671 | ||
1672 | /* We assume we always know if a thread exits. If a whole process | |
1673 | exited but we still haven't been able to report it to GDB, we'll | |
1674 | hold on to the last lwp of the dead process. */ | |
1675 | if (lwp != NULL) | |
00db26fa | 1676 | return !lwp_is_marked_dead (lwp); |
0d62e5e8 DJ |
1677 | else |
1678 | return 0; | |
1679 | } | |
1680 | ||
582511be PA |
1681 | /* Return 1 if this lwp still has an interesting status pending. If |
1682 | not (e.g., it had stopped for a breakpoint that is gone), return | |
1683 | false. */ | |
1684 | ||
1685 | static int | |
1686 | thread_still_has_status_pending_p (struct thread_info *thread) | |
1687 | { | |
1688 | struct lwp_info *lp = get_thread_lwp (thread); | |
1689 | ||
1690 | if (!lp->status_pending_p) | |
1691 | return 0; | |
1692 | ||
582511be | 1693 | if (thread->last_resume_kind != resume_stop |
15c66dd6 PA |
1694 | && (lp->stop_reason == TARGET_STOPPED_BY_SW_BREAKPOINT |
1695 | || lp->stop_reason == TARGET_STOPPED_BY_HW_BREAKPOINT)) | |
582511be PA |
1696 | { |
1697 | struct thread_info *saved_thread; | |
1698 | CORE_ADDR pc; | |
1699 | int discard = 0; | |
1700 | ||
1701 | gdb_assert (lp->last_status != 0); | |
1702 | ||
1703 | pc = get_pc (lp); | |
1704 | ||
1705 | saved_thread = current_thread; | |
1706 | current_thread = thread; | |
1707 | ||
1708 | if (pc != lp->stop_pc) | |
1709 | { | |
1710 | if (debug_threads) | |
1711 | debug_printf ("PC of %ld changed\n", | |
1712 | lwpid_of (thread)); | |
1713 | discard = 1; | |
1714 | } | |
3e572f71 PA |
1715 | |
1716 | #if !USE_SIGTRAP_SIGINFO | |
15c66dd6 | 1717 | else if (lp->stop_reason == TARGET_STOPPED_BY_SW_BREAKPOINT |
582511be PA |
1718 | && !(*the_low_target.breakpoint_at) (pc)) |
1719 | { | |
1720 | if (debug_threads) | |
1721 | debug_printf ("previous SW breakpoint of %ld gone\n", | |
1722 | lwpid_of (thread)); | |
1723 | discard = 1; | |
1724 | } | |
15c66dd6 | 1725 | else if (lp->stop_reason == TARGET_STOPPED_BY_HW_BREAKPOINT |
582511be PA |
1726 | && !hardware_breakpoint_inserted_here (pc)) |
1727 | { | |
1728 | if (debug_threads) | |
1729 | debug_printf ("previous HW breakpoint of %ld gone\n", | |
1730 | lwpid_of (thread)); | |
1731 | discard = 1; | |
1732 | } | |
3e572f71 | 1733 | #endif |
582511be PA |
1734 | |
1735 | current_thread = saved_thread; | |
1736 | ||
1737 | if (discard) | |
1738 | { | |
1739 | if (debug_threads) | |
1740 | debug_printf ("discarding pending breakpoint status\n"); | |
1741 | lp->status_pending_p = 0; | |
1742 | return 0; | |
1743 | } | |
1744 | } | |
1745 | ||
1746 | return 1; | |
1747 | } | |
1748 | ||
a681f9c9 PA |
1749 | /* Returns true if LWP is resumed from the client's perspective. */ |
1750 | ||
1751 | static int | |
1752 | lwp_resumed (struct lwp_info *lwp) | |
1753 | { | |
1754 | struct thread_info *thread = get_lwp_thread (lwp); | |
1755 | ||
1756 | if (thread->last_resume_kind != resume_stop) | |
1757 | return 1; | |
1758 | ||
1759 | /* Did gdb send us a `vCont;t', but we haven't reported the | |
1760 | corresponding stop to gdb yet? If so, the thread is still | |
1761 | resumed/running from gdb's perspective. */ | |
1762 | if (thread->last_resume_kind == resume_stop | |
1763 | && thread->last_status.kind == TARGET_WAITKIND_IGNORE) | |
1764 | return 1; | |
1765 | ||
1766 | return 0; | |
1767 | } | |
1768 | ||
83e1b6c1 SM |
1769 | /* Return true if this lwp has an interesting status pending. */ |
1770 | static bool | |
1771 | status_pending_p_callback (thread_info *thread, ptid_t ptid) | |
0d62e5e8 | 1772 | { |
582511be | 1773 | struct lwp_info *lp = get_thread_lwp (thread); |
95954743 PA |
1774 | |
1775 | /* Check if we're only interested in events from a specific process | |
afa8d396 | 1776 | or a specific LWP. */ |
83e1b6c1 | 1777 | if (!thread->id.matches (ptid)) |
95954743 | 1778 | return 0; |
0d62e5e8 | 1779 | |
a681f9c9 PA |
1780 | if (!lwp_resumed (lp)) |
1781 | return 0; | |
1782 | ||
582511be PA |
1783 | if (lp->status_pending_p |
1784 | && !thread_still_has_status_pending_p (thread)) | |
1785 | { | |
1786 | linux_resume_one_lwp (lp, lp->stepping, GDB_SIGNAL_0, NULL); | |
1787 | return 0; | |
1788 | } | |
0d62e5e8 | 1789 | |
582511be | 1790 | return lp->status_pending_p; |
0d62e5e8 DJ |
1791 | } |
1792 | ||
95954743 PA |
1793 | struct lwp_info * |
1794 | find_lwp_pid (ptid_t ptid) | |
1795 | { | |
da4ae14a | 1796 | thread_info *thread = find_thread ([&] (thread_info *thr_arg) |
454296a2 SM |
1797 | { |
1798 | int lwp = ptid.lwp () != 0 ? ptid.lwp () : ptid.pid (); | |
da4ae14a | 1799 | return thr_arg->id.lwp () == lwp; |
454296a2 | 1800 | }); |
d86d4aaf DE |
1801 | |
1802 | if (thread == NULL) | |
1803 | return NULL; | |
1804 | ||
9c80ecd6 | 1805 | return get_thread_lwp (thread); |
95954743 PA |
1806 | } |
1807 | ||
fa96cb38 | 1808 | /* Return the number of known LWPs in the tgid given by PID. */ |
0d62e5e8 | 1809 | |
fa96cb38 PA |
1810 | static int |
1811 | num_lwps (int pid) | |
1812 | { | |
fa96cb38 | 1813 | int count = 0; |
0d62e5e8 | 1814 | |
4d3bb80e SM |
1815 | for_each_thread (pid, [&] (thread_info *thread) |
1816 | { | |
9c80ecd6 | 1817 | count++; |
4d3bb80e | 1818 | }); |
3aee8918 | 1819 | |
fa96cb38 PA |
1820 | return count; |
1821 | } | |
d61ddec4 | 1822 | |
6d4ee8c6 GB |
1823 | /* See nat/linux-nat.h. */ |
1824 | ||
1825 | struct lwp_info * | |
1826 | iterate_over_lwps (ptid_t filter, | |
d3a70e03 | 1827 | gdb::function_view<iterate_over_lwps_ftype> callback) |
6d4ee8c6 | 1828 | { |
da4ae14a | 1829 | thread_info *thread = find_thread (filter, [&] (thread_info *thr_arg) |
6d1e5673 | 1830 | { |
da4ae14a | 1831 | lwp_info *lwp = get_thread_lwp (thr_arg); |
6d1e5673 | 1832 | |
d3a70e03 | 1833 | return callback (lwp); |
6d1e5673 | 1834 | }); |
6d4ee8c6 | 1835 | |
9c80ecd6 | 1836 | if (thread == NULL) |
6d4ee8c6 GB |
1837 | return NULL; |
1838 | ||
9c80ecd6 | 1839 | return get_thread_lwp (thread); |
6d4ee8c6 GB |
1840 | } |
1841 | ||
fa96cb38 PA |
1842 | /* Detect zombie thread group leaders, and "exit" them. We can't reap |
1843 | their exits until all other threads in the group have exited. */ | |
c3adc08c | 1844 | |
fa96cb38 PA |
1845 | static void |
1846 | check_zombie_leaders (void) | |
1847 | { | |
9179355e SM |
1848 | for_each_process ([] (process_info *proc) { |
1849 | pid_t leader_pid = pid_of (proc); | |
1850 | struct lwp_info *leader_lp; | |
1851 | ||
f2907e49 | 1852 | leader_lp = find_lwp_pid (ptid_t (leader_pid)); |
9179355e SM |
1853 | |
1854 | if (debug_threads) | |
1855 | debug_printf ("leader_pid=%d, leader_lp!=NULL=%d, " | |
1856 | "num_lwps=%d, zombie=%d\n", | |
1857 | leader_pid, leader_lp!= NULL, num_lwps (leader_pid), | |
1858 | linux_proc_pid_is_zombie (leader_pid)); | |
1859 | ||
1860 | if (leader_lp != NULL && !leader_lp->stopped | |
1861 | /* Check if there are other threads in the group, as we may | |
1862 | have raced with the inferior simply exiting. */ | |
1863 | && !last_thread_of_process_p (leader_pid) | |
1864 | && linux_proc_pid_is_zombie (leader_pid)) | |
1865 | { | |
1866 | /* A leader zombie can mean one of two things: | |
1867 | ||
1868 | - It exited, and there's an exit status pending | |
1869 | available, or only the leader exited (not the whole | |
1870 | program). In the latter case, we can't waitpid the | |
1871 | leader's exit status until all other threads are gone. | |
1872 | ||
1873 | - There are 3 or more threads in the group, and a thread | |
1874 | other than the leader exec'd. On an exec, the Linux | |
1875 | kernel destroys all other threads (except the execing | |
1876 | one) in the thread group, and resets the execing thread's | |
1877 | tid to the tgid. No exit notification is sent for the | |
1878 | execing thread -- from the ptracer's perspective, it | |
1879 | appears as though the execing thread just vanishes. | |
1880 | Until we reap all other threads except the leader and the | |
1881 | execing thread, the leader will be zombie, and the | |
1882 | execing thread will be in `D (disc sleep)'. As soon as | |
1883 | all other threads are reaped, the execing thread changes | |
1884 | it's tid to the tgid, and the previous (zombie) leader | |
1885 | vanishes, giving place to the "new" leader. We could try | |
1886 | distinguishing the exit and exec cases, by waiting once | |
1887 | more, and seeing if something comes out, but it doesn't | |
1888 | sound useful. The previous leader _does_ go away, and | |
1889 | we'll re-add the new one once we see the exec event | |
1890 | (which is just the same as what would happen if the | |
1891 | previous leader did exit voluntarily before some other | |
1892 | thread execs). */ | |
1893 | ||
1894 | if (debug_threads) | |
1895 | debug_printf ("CZL: Thread group leader %d zombie " | |
1896 | "(it exited, or another thread execd).\n", | |
1897 | leader_pid); | |
1898 | ||
1899 | delete_lwp (leader_lp); | |
1900 | } | |
1901 | }); | |
fa96cb38 | 1902 | } |
c3adc08c | 1903 | |
a1385b7b SM |
1904 | /* Callback for `find_thread'. Returns the first LWP that is not |
1905 | stopped. */ | |
d50171e4 | 1906 | |
a1385b7b SM |
1907 | static bool |
1908 | not_stopped_callback (thread_info *thread, ptid_t filter) | |
fa96cb38 | 1909 | { |
a1385b7b SM |
1910 | if (!thread->id.matches (filter)) |
1911 | return false; | |
47c0c975 | 1912 | |
a1385b7b | 1913 | lwp_info *lwp = get_thread_lwp (thread); |
fa96cb38 | 1914 | |
a1385b7b | 1915 | return !lwp->stopped; |
0d62e5e8 | 1916 | } |
611cb4a5 | 1917 | |
863d01bd PA |
1918 | /* Increment LWP's suspend count. */ |
1919 | ||
1920 | static void | |
1921 | lwp_suspended_inc (struct lwp_info *lwp) | |
1922 | { | |
1923 | lwp->suspended++; | |
1924 | ||
1925 | if (debug_threads && lwp->suspended > 4) | |
1926 | { | |
1927 | struct thread_info *thread = get_lwp_thread (lwp); | |
1928 | ||
1929 | debug_printf ("LWP %ld has a suspiciously high suspend count," | |
1930 | " suspended=%d\n", lwpid_of (thread), lwp->suspended); | |
1931 | } | |
1932 | } | |
1933 | ||
1934 | /* Decrement LWP's suspend count. */ | |
1935 | ||
1936 | static void | |
1937 | lwp_suspended_decr (struct lwp_info *lwp) | |
1938 | { | |
1939 | lwp->suspended--; | |
1940 | ||
1941 | if (lwp->suspended < 0) | |
1942 | { | |
1943 | struct thread_info *thread = get_lwp_thread (lwp); | |
1944 | ||
1945 | internal_error (__FILE__, __LINE__, | |
1946 | "unsuspend LWP %ld, suspended=%d\n", lwpid_of (thread), | |
1947 | lwp->suspended); | |
1948 | } | |
1949 | } | |
1950 | ||
219f2f23 PA |
1951 | /* This function should only be called if the LWP got a SIGTRAP. |
1952 | ||
1953 | Handle any tracepoint steps or hits. Return true if a tracepoint | |
1954 | event was handled, 0 otherwise. */ | |
1955 | ||
1956 | static int | |
1957 | handle_tracepoints (struct lwp_info *lwp) | |
1958 | { | |
1959 | struct thread_info *tinfo = get_lwp_thread (lwp); | |
1960 | int tpoint_related_event = 0; | |
1961 | ||
582511be PA |
1962 | gdb_assert (lwp->suspended == 0); |
1963 | ||
7984d532 PA |
1964 | /* If this tracepoint hit causes a tracing stop, we'll immediately |
1965 | uninsert tracepoints. To do this, we temporarily pause all | |
1966 | threads, unpatch away, and then unpause threads. We need to make | |
1967 | sure the unpausing doesn't resume LWP too. */ | |
863d01bd | 1968 | lwp_suspended_inc (lwp); |
7984d532 | 1969 | |
219f2f23 PA |
1970 | /* And we need to be sure that any all-threads-stopping doesn't try |
1971 | to move threads out of the jump pads, as it could deadlock the | |
1972 | inferior (LWP could be in the jump pad, maybe even holding the | |
1973 | lock.) */ | |
1974 | ||
1975 | /* Do any necessary step collect actions. */ | |
1976 | tpoint_related_event |= tracepoint_finished_step (tinfo, lwp->stop_pc); | |
1977 | ||
fa593d66 PA |
1978 | tpoint_related_event |= handle_tracepoint_bkpts (tinfo, lwp->stop_pc); |
1979 | ||
219f2f23 PA |
1980 | /* See if we just hit a tracepoint and do its main collect |
1981 | actions. */ | |
1982 | tpoint_related_event |= tracepoint_was_hit (tinfo, lwp->stop_pc); | |
1983 | ||
863d01bd | 1984 | lwp_suspended_decr (lwp); |
7984d532 PA |
1985 | |
1986 | gdb_assert (lwp->suspended == 0); | |
229d26fc SM |
1987 | gdb_assert (!stabilizing_threads |
1988 | || (lwp->collecting_fast_tracepoint | |
1989 | != fast_tpoint_collect_result::not_collecting)); | |
7984d532 | 1990 | |
219f2f23 PA |
1991 | if (tpoint_related_event) |
1992 | { | |
1993 | if (debug_threads) | |
87ce2a04 | 1994 | debug_printf ("got a tracepoint event\n"); |
219f2f23 PA |
1995 | return 1; |
1996 | } | |
1997 | ||
1998 | return 0; | |
1999 | } | |
2000 | ||
229d26fc SM |
2001 | /* Convenience wrapper. Returns information about LWP's fast tracepoint |
2002 | collection status. */ | |
fa593d66 | 2003 | |
229d26fc | 2004 | static fast_tpoint_collect_result |
fa593d66 PA |
2005 | linux_fast_tracepoint_collecting (struct lwp_info *lwp, |
2006 | struct fast_tpoint_collect_status *status) | |
2007 | { | |
2008 | CORE_ADDR thread_area; | |
d86d4aaf | 2009 | struct thread_info *thread = get_lwp_thread (lwp); |
fa593d66 PA |
2010 | |
2011 | if (the_low_target.get_thread_area == NULL) | |
229d26fc | 2012 | return fast_tpoint_collect_result::not_collecting; |
fa593d66 PA |
2013 | |
2014 | /* Get the thread area address. This is used to recognize which | |
2015 | thread is which when tracing with the in-process agent library. | |
2016 | We don't read anything from the address, and treat it as opaque; | |
2017 | it's the address itself that we assume is unique per-thread. */ | |
d86d4aaf | 2018 | if ((*the_low_target.get_thread_area) (lwpid_of (thread), &thread_area) == -1) |
229d26fc | 2019 | return fast_tpoint_collect_result::not_collecting; |
fa593d66 PA |
2020 | |
2021 | return fast_tracepoint_collecting (thread_area, lwp->stop_pc, status); | |
2022 | } | |
2023 | ||
d16f3f6c TBA |
2024 | bool |
2025 | linux_process_target::maybe_move_out_of_jump_pad (lwp_info *lwp, int *wstat) | |
fa593d66 | 2026 | { |
0bfdf32f | 2027 | struct thread_info *saved_thread; |
fa593d66 | 2028 | |
0bfdf32f GB |
2029 | saved_thread = current_thread; |
2030 | current_thread = get_lwp_thread (lwp); | |
fa593d66 PA |
2031 | |
2032 | if ((wstat == NULL | |
2033 | || (WIFSTOPPED (*wstat) && WSTOPSIG (*wstat) != SIGTRAP)) | |
2034 | && supports_fast_tracepoints () | |
58b4daa5 | 2035 | && agent_loaded_p ()) |
fa593d66 PA |
2036 | { |
2037 | struct fast_tpoint_collect_status status; | |
fa593d66 PA |
2038 | |
2039 | if (debug_threads) | |
87ce2a04 DE |
2040 | debug_printf ("Checking whether LWP %ld needs to move out of the " |
2041 | "jump pad.\n", | |
0bfdf32f | 2042 | lwpid_of (current_thread)); |
fa593d66 | 2043 | |
229d26fc SM |
2044 | fast_tpoint_collect_result r |
2045 | = linux_fast_tracepoint_collecting (lwp, &status); | |
fa593d66 PA |
2046 | |
2047 | if (wstat == NULL | |
2048 | || (WSTOPSIG (*wstat) != SIGILL | |
2049 | && WSTOPSIG (*wstat) != SIGFPE | |
2050 | && WSTOPSIG (*wstat) != SIGSEGV | |
2051 | && WSTOPSIG (*wstat) != SIGBUS)) | |
2052 | { | |
2053 | lwp->collecting_fast_tracepoint = r; | |
2054 | ||
229d26fc | 2055 | if (r != fast_tpoint_collect_result::not_collecting) |
fa593d66 | 2056 | { |
229d26fc SM |
2057 | if (r == fast_tpoint_collect_result::before_insn |
2058 | && lwp->exit_jump_pad_bkpt == NULL) | |
fa593d66 PA |
2059 | { |
2060 | /* Haven't executed the original instruction yet. | |
2061 | Set breakpoint there, and wait till it's hit, | |
2062 | then single-step until exiting the jump pad. */ | |
2063 | lwp->exit_jump_pad_bkpt | |
2064 | = set_breakpoint_at (status.adjusted_insn_addr, NULL); | |
2065 | } | |
2066 | ||
2067 | if (debug_threads) | |
87ce2a04 DE |
2068 | debug_printf ("Checking whether LWP %ld needs to move out of " |
2069 | "the jump pad...it does\n", | |
0bfdf32f GB |
2070 | lwpid_of (current_thread)); |
2071 | current_thread = saved_thread; | |
fa593d66 | 2072 | |
d16f3f6c | 2073 | return true; |
fa593d66 PA |
2074 | } |
2075 | } | |
2076 | else | |
2077 | { | |
2078 | /* If we get a synchronous signal while collecting, *and* | |
2079 | while executing the (relocated) original instruction, | |
2080 | reset the PC to point at the tpoint address, before | |
2081 | reporting to GDB. Otherwise, it's an IPA lib bug: just | |
2082 | report the signal to GDB, and pray for the best. */ | |
2083 | ||
229d26fc SM |
2084 | lwp->collecting_fast_tracepoint |
2085 | = fast_tpoint_collect_result::not_collecting; | |
fa593d66 | 2086 | |
229d26fc | 2087 | if (r != fast_tpoint_collect_result::not_collecting |
fa593d66 PA |
2088 | && (status.adjusted_insn_addr <= lwp->stop_pc |
2089 | && lwp->stop_pc < status.adjusted_insn_addr_end)) | |
2090 | { | |
2091 | siginfo_t info; | |
2092 | struct regcache *regcache; | |
2093 | ||
2094 | /* The si_addr on a few signals references the address | |
2095 | of the faulting instruction. Adjust that as | |
2096 | well. */ | |
2097 | if ((WSTOPSIG (*wstat) == SIGILL | |
2098 | || WSTOPSIG (*wstat) == SIGFPE | |
2099 | || WSTOPSIG (*wstat) == SIGBUS | |
2100 | || WSTOPSIG (*wstat) == SIGSEGV) | |
0bfdf32f | 2101 | && ptrace (PTRACE_GETSIGINFO, lwpid_of (current_thread), |
b8e1b30e | 2102 | (PTRACE_TYPE_ARG3) 0, &info) == 0 |
fa593d66 PA |
2103 | /* Final check just to make sure we don't clobber |
2104 | the siginfo of non-kernel-sent signals. */ | |
2105 | && (uintptr_t) info.si_addr == lwp->stop_pc) | |
2106 | { | |
2107 | info.si_addr = (void *) (uintptr_t) status.tpoint_addr; | |
0bfdf32f | 2108 | ptrace (PTRACE_SETSIGINFO, lwpid_of (current_thread), |
b8e1b30e | 2109 | (PTRACE_TYPE_ARG3) 0, &info); |
fa593d66 PA |
2110 | } |
2111 | ||
0bfdf32f | 2112 | regcache = get_thread_regcache (current_thread, 1); |
fa593d66 PA |
2113 | (*the_low_target.set_pc) (regcache, status.tpoint_addr); |
2114 | lwp->stop_pc = status.tpoint_addr; | |
2115 | ||
2116 | /* Cancel any fast tracepoint lock this thread was | |
2117 | holding. */ | |
2118 | force_unlock_trace_buffer (); | |
2119 | } | |
2120 | ||
2121 | if (lwp->exit_jump_pad_bkpt != NULL) | |
2122 | { | |
2123 | if (debug_threads) | |
87ce2a04 DE |
2124 | debug_printf ("Cancelling fast exit-jump-pad: removing bkpt. " |
2125 | "stopping all threads momentarily.\n"); | |
fa593d66 PA |
2126 | |
2127 | stop_all_lwps (1, lwp); | |
fa593d66 PA |
2128 | |
2129 | delete_breakpoint (lwp->exit_jump_pad_bkpt); | |
2130 | lwp->exit_jump_pad_bkpt = NULL; | |
2131 | ||
2132 | unstop_all_lwps (1, lwp); | |
2133 | ||
2134 | gdb_assert (lwp->suspended >= 0); | |
2135 | } | |
2136 | } | |
2137 | } | |
2138 | ||
2139 | if (debug_threads) | |
87ce2a04 DE |
2140 | debug_printf ("Checking whether LWP %ld needs to move out of the " |
2141 | "jump pad...no\n", | |
0bfdf32f | 2142 | lwpid_of (current_thread)); |
0cccb683 | 2143 | |
0bfdf32f | 2144 | current_thread = saved_thread; |
d16f3f6c | 2145 | return false; |
fa593d66 PA |
2146 | } |
2147 | ||
2148 | /* Enqueue one signal in the "signals to report later when out of the | |
2149 | jump pad" list. */ | |
2150 | ||
2151 | static void | |
2152 | enqueue_one_deferred_signal (struct lwp_info *lwp, int *wstat) | |
2153 | { | |
2154 | struct pending_signals *p_sig; | |
d86d4aaf | 2155 | struct thread_info *thread = get_lwp_thread (lwp); |
fa593d66 PA |
2156 | |
2157 | if (debug_threads) | |
87ce2a04 | 2158 | debug_printf ("Deferring signal %d for LWP %ld.\n", |
d86d4aaf | 2159 | WSTOPSIG (*wstat), lwpid_of (thread)); |
fa593d66 PA |
2160 | |
2161 | if (debug_threads) | |
2162 | { | |
2163 | struct pending_signals *sig; | |
2164 | ||
2165 | for (sig = lwp->pending_signals_to_report; | |
2166 | sig != NULL; | |
2167 | sig = sig->prev) | |
87ce2a04 DE |
2168 | debug_printf (" Already queued %d\n", |
2169 | sig->signal); | |
fa593d66 | 2170 | |
87ce2a04 | 2171 | debug_printf (" (no more currently queued signals)\n"); |
fa593d66 PA |
2172 | } |
2173 | ||
1a981360 PA |
2174 | /* Don't enqueue non-RT signals if they are already in the deferred |
2175 | queue. (SIGSTOP being the easiest signal to see ending up here | |
2176 | twice) */ | |
2177 | if (WSTOPSIG (*wstat) < __SIGRTMIN) | |
2178 | { | |
2179 | struct pending_signals *sig; | |
2180 | ||
2181 | for (sig = lwp->pending_signals_to_report; | |
2182 | sig != NULL; | |
2183 | sig = sig->prev) | |
2184 | { | |
2185 | if (sig->signal == WSTOPSIG (*wstat)) | |
2186 | { | |
2187 | if (debug_threads) | |
87ce2a04 DE |
2188 | debug_printf ("Not requeuing already queued non-RT signal %d" |
2189 | " for LWP %ld\n", | |
2190 | sig->signal, | |
d86d4aaf | 2191 | lwpid_of (thread)); |
1a981360 PA |
2192 | return; |
2193 | } | |
2194 | } | |
2195 | } | |
2196 | ||
8d749320 | 2197 | p_sig = XCNEW (struct pending_signals); |
fa593d66 PA |
2198 | p_sig->prev = lwp->pending_signals_to_report; |
2199 | p_sig->signal = WSTOPSIG (*wstat); | |
8d749320 | 2200 | |
d86d4aaf | 2201 | ptrace (PTRACE_GETSIGINFO, lwpid_of (thread), (PTRACE_TYPE_ARG3) 0, |
56f7af9c | 2202 | &p_sig->info); |
fa593d66 PA |
2203 | |
2204 | lwp->pending_signals_to_report = p_sig; | |
2205 | } | |
2206 | ||
2207 | /* Dequeue one signal from the "signals to report later when out of | |
2208 | the jump pad" list. */ | |
2209 | ||
2210 | static int | |
2211 | dequeue_one_deferred_signal (struct lwp_info *lwp, int *wstat) | |
2212 | { | |
d86d4aaf DE |
2213 | struct thread_info *thread = get_lwp_thread (lwp); |
2214 | ||
fa593d66 PA |
2215 | if (lwp->pending_signals_to_report != NULL) |
2216 | { | |
2217 | struct pending_signals **p_sig; | |
2218 | ||
2219 | p_sig = &lwp->pending_signals_to_report; | |
2220 | while ((*p_sig)->prev != NULL) | |
2221 | p_sig = &(*p_sig)->prev; | |
2222 | ||
2223 | *wstat = W_STOPCODE ((*p_sig)->signal); | |
2224 | if ((*p_sig)->info.si_signo != 0) | |
d86d4aaf | 2225 | ptrace (PTRACE_SETSIGINFO, lwpid_of (thread), (PTRACE_TYPE_ARG3) 0, |
56f7af9c | 2226 | &(*p_sig)->info); |
fa593d66 PA |
2227 | free (*p_sig); |
2228 | *p_sig = NULL; | |
2229 | ||
2230 | if (debug_threads) | |
87ce2a04 | 2231 | debug_printf ("Reporting deferred signal %d for LWP %ld.\n", |
d86d4aaf | 2232 | WSTOPSIG (*wstat), lwpid_of (thread)); |
fa593d66 PA |
2233 | |
2234 | if (debug_threads) | |
2235 | { | |
2236 | struct pending_signals *sig; | |
2237 | ||
2238 | for (sig = lwp->pending_signals_to_report; | |
2239 | sig != NULL; | |
2240 | sig = sig->prev) | |
87ce2a04 DE |
2241 | debug_printf (" Still queued %d\n", |
2242 | sig->signal); | |
fa593d66 | 2243 | |
87ce2a04 | 2244 | debug_printf (" (no more queued signals)\n"); |
fa593d66 PA |
2245 | } |
2246 | ||
2247 | return 1; | |
2248 | } | |
2249 | ||
2250 | return 0; | |
2251 | } | |
2252 | ||
582511be PA |
2253 | /* Fetch the possibly triggered data watchpoint info and store it in |
2254 | CHILD. | |
d50171e4 | 2255 | |
582511be PA |
2256 | On some archs, like x86, that use debug registers to set |
2257 | watchpoints, it's possible that the way to know which watched | |
2258 | address trapped, is to check the register that is used to select | |
2259 | which address to watch. Problem is, between setting the watchpoint | |
2260 | and reading back which data address trapped, the user may change | |
2261 | the set of watchpoints, and, as a consequence, GDB changes the | |
2262 | debug registers in the inferior. To avoid reading back a stale | |
2263 | stopped-data-address when that happens, we cache in LP the fact | |
2264 | that a watchpoint trapped, and the corresponding data address, as | |
2265 | soon as we see CHILD stop with a SIGTRAP. If GDB changes the debug | |
2266 | registers meanwhile, we have the cached data we can rely on. */ | |
d50171e4 | 2267 | |
582511be PA |
2268 | static int |
2269 | check_stopped_by_watchpoint (struct lwp_info *child) | |
2270 | { | |
2271 | if (the_low_target.stopped_by_watchpoint != NULL) | |
d50171e4 | 2272 | { |
582511be | 2273 | struct thread_info *saved_thread; |
d50171e4 | 2274 | |
582511be PA |
2275 | saved_thread = current_thread; |
2276 | current_thread = get_lwp_thread (child); | |
2277 | ||
2278 | if (the_low_target.stopped_by_watchpoint ()) | |
d50171e4 | 2279 | { |
15c66dd6 | 2280 | child->stop_reason = TARGET_STOPPED_BY_WATCHPOINT; |
582511be PA |
2281 | |
2282 | if (the_low_target.stopped_data_address != NULL) | |
2283 | child->stopped_data_address | |
2284 | = the_low_target.stopped_data_address (); | |
2285 | else | |
2286 | child->stopped_data_address = 0; | |
d50171e4 PA |
2287 | } |
2288 | ||
0bfdf32f | 2289 | current_thread = saved_thread; |
d50171e4 PA |
2290 | } |
2291 | ||
15c66dd6 | 2292 | return child->stop_reason == TARGET_STOPPED_BY_WATCHPOINT; |
c4d9ceb6 YQ |
2293 | } |
2294 | ||
de0d863e DB |
2295 | /* Return the ptrace options that we want to try to enable. */ |
2296 | ||
2297 | static int | |
2298 | linux_low_ptrace_options (int attached) | |
2299 | { | |
c12a5089 | 2300 | client_state &cs = get_client_state (); |
de0d863e DB |
2301 | int options = 0; |
2302 | ||
2303 | if (!attached) | |
2304 | options |= PTRACE_O_EXITKILL; | |
2305 | ||
c12a5089 | 2306 | if (cs.report_fork_events) |
de0d863e DB |
2307 | options |= PTRACE_O_TRACEFORK; |
2308 | ||
c12a5089 | 2309 | if (cs.report_vfork_events) |
c269dbdb DB |
2310 | options |= (PTRACE_O_TRACEVFORK | PTRACE_O_TRACEVFORKDONE); |
2311 | ||
c12a5089 | 2312 | if (cs.report_exec_events) |
94585166 DB |
2313 | options |= PTRACE_O_TRACEEXEC; |
2314 | ||
82075af2 JS |
2315 | options |= PTRACE_O_TRACESYSGOOD; |
2316 | ||
de0d863e DB |
2317 | return options; |
2318 | } | |
2319 | ||
d16f3f6c TBA |
2320 | lwp_info * |
2321 | linux_process_target::filter_event (int lwpid, int wstat) | |
fa96cb38 | 2322 | { |
c12a5089 | 2323 | client_state &cs = get_client_state (); |
fa96cb38 PA |
2324 | struct lwp_info *child; |
2325 | struct thread_info *thread; | |
582511be | 2326 | int have_stop_pc = 0; |
fa96cb38 | 2327 | |
f2907e49 | 2328 | child = find_lwp_pid (ptid_t (lwpid)); |
fa96cb38 | 2329 | |
94585166 DB |
2330 | /* Check for stop events reported by a process we didn't already |
2331 | know about - anything not already in our LWP list. | |
2332 | ||
2333 | If we're expecting to receive stopped processes after | |
2334 | fork, vfork, and clone events, then we'll just add the | |
2335 | new one to our list and go back to waiting for the event | |
2336 | to be reported - the stopped process might be returned | |
2337 | from waitpid before or after the event is. | |
2338 | ||
2339 | But note the case of a non-leader thread exec'ing after the | |
2340 | leader having exited, and gone from our lists (because | |
2341 | check_zombie_leaders deleted it). The non-leader thread | |
2342 | changes its tid to the tgid. */ | |
2343 | ||
2344 | if (WIFSTOPPED (wstat) && child == NULL && WSTOPSIG (wstat) == SIGTRAP | |
2345 | && linux_ptrace_get_extended_event (wstat) == PTRACE_EVENT_EXEC) | |
2346 | { | |
2347 | ptid_t child_ptid; | |
2348 | ||
2349 | /* A multi-thread exec after we had seen the leader exiting. */ | |
2350 | if (debug_threads) | |
2351 | { | |
2352 | debug_printf ("LLW: Re-adding thread group leader LWP %d" | |
2353 | "after exec.\n", lwpid); | |
2354 | } | |
2355 | ||
fd79271b | 2356 | child_ptid = ptid_t (lwpid, lwpid, 0); |
94585166 DB |
2357 | child = add_lwp (child_ptid); |
2358 | child->stopped = 1; | |
2359 | current_thread = child->thread; | |
2360 | } | |
2361 | ||
fa96cb38 PA |
2362 | /* If we didn't find a process, one of two things presumably happened: |
2363 | - A process we started and then detached from has exited. Ignore it. | |
2364 | - A process we are controlling has forked and the new child's stop | |
2365 | was reported to us by the kernel. Save its PID. */ | |
2366 | if (child == NULL && WIFSTOPPED (wstat)) | |
2367 | { | |
2368 | add_to_pid_list (&stopped_pids, lwpid, wstat); | |
2369 | return NULL; | |
2370 | } | |
2371 | else if (child == NULL) | |
2372 | return NULL; | |
2373 | ||
2374 | thread = get_lwp_thread (child); | |
2375 | ||
2376 | child->stopped = 1; | |
2377 | ||
2378 | child->last_status = wstat; | |
2379 | ||
582511be PA |
2380 | /* Check if the thread has exited. */ |
2381 | if ((WIFEXITED (wstat) || WIFSIGNALED (wstat))) | |
2382 | { | |
2383 | if (debug_threads) | |
2384 | debug_printf ("LLFE: %d exited.\n", lwpid); | |
f50bf8e5 YQ |
2385 | |
2386 | if (finish_step_over (child)) | |
2387 | { | |
2388 | /* Unsuspend all other LWPs, and set them back running again. */ | |
2389 | unsuspend_all_lwps (child); | |
2390 | } | |
2391 | ||
65706a29 PA |
2392 | /* If there is at least one more LWP, then the exit signal was |
2393 | not the end of the debugged application and should be | |
2394 | ignored, unless GDB wants to hear about thread exits. */ | |
c12a5089 | 2395 | if (cs.report_thread_events |
65706a29 | 2396 | || last_thread_of_process_p (pid_of (thread))) |
582511be | 2397 | { |
65706a29 PA |
2398 | /* Since events are serialized to GDB core, and we can't |
2399 | report this one right now. Leave the status pending for | |
2400 | the next time we're able to report it. */ | |
2401 | mark_lwp_dead (child, wstat); | |
2402 | return child; | |
582511be PA |
2403 | } |
2404 | else | |
2405 | { | |
65706a29 PA |
2406 | delete_lwp (child); |
2407 | return NULL; | |
582511be PA |
2408 | } |
2409 | } | |
2410 | ||
2411 | gdb_assert (WIFSTOPPED (wstat)); | |
2412 | ||
fa96cb38 PA |
2413 | if (WIFSTOPPED (wstat)) |
2414 | { | |
2415 | struct process_info *proc; | |
2416 | ||
c06cbd92 | 2417 | /* Architecture-specific setup after inferior is running. */ |
fa96cb38 | 2418 | proc = find_process_pid (pid_of (thread)); |
c06cbd92 | 2419 | if (proc->tdesc == NULL) |
fa96cb38 | 2420 | { |
c06cbd92 YQ |
2421 | if (proc->attached) |
2422 | { | |
c06cbd92 YQ |
2423 | /* This needs to happen after we have attached to the |
2424 | inferior and it is stopped for the first time, but | |
2425 | before we access any inferior registers. */ | |
797bcff5 | 2426 | arch_setup_thread (thread); |
c06cbd92 YQ |
2427 | } |
2428 | else | |
2429 | { | |
2430 | /* The process is started, but GDBserver will do | |
2431 | architecture-specific setup after the program stops at | |
2432 | the first instruction. */ | |
2433 | child->status_pending_p = 1; | |
2434 | child->status_pending = wstat; | |
2435 | return child; | |
2436 | } | |
fa96cb38 PA |
2437 | } |
2438 | } | |
2439 | ||
fa96cb38 PA |
2440 | if (WIFSTOPPED (wstat) && child->must_set_ptrace_flags) |
2441 | { | |
beed38b8 | 2442 | struct process_info *proc = find_process_pid (pid_of (thread)); |
de0d863e | 2443 | int options = linux_low_ptrace_options (proc->attached); |
beed38b8 | 2444 | |
de0d863e | 2445 | linux_enable_event_reporting (lwpid, options); |
fa96cb38 PA |
2446 | child->must_set_ptrace_flags = 0; |
2447 | } | |
2448 | ||
82075af2 JS |
2449 | /* Always update syscall_state, even if it will be filtered later. */ |
2450 | if (WIFSTOPPED (wstat) && WSTOPSIG (wstat) == SYSCALL_SIGTRAP) | |
2451 | { | |
2452 | child->syscall_state | |
2453 | = (child->syscall_state == TARGET_WAITKIND_SYSCALL_ENTRY | |
2454 | ? TARGET_WAITKIND_SYSCALL_RETURN | |
2455 | : TARGET_WAITKIND_SYSCALL_ENTRY); | |
2456 | } | |
2457 | else | |
2458 | { | |
2459 | /* Almost all other ptrace-stops are known to be outside of system | |
2460 | calls, with further exceptions in handle_extended_wait. */ | |
2461 | child->syscall_state = TARGET_WAITKIND_IGNORE; | |
2462 | } | |
2463 | ||
e7ad2f14 PA |
2464 | /* Be careful to not overwrite stop_pc until save_stop_reason is |
2465 | called. */ | |
fa96cb38 | 2466 | if (WIFSTOPPED (wstat) && WSTOPSIG (wstat) == SIGTRAP |
89a5711c | 2467 | && linux_is_extended_waitstatus (wstat)) |
fa96cb38 | 2468 | { |
582511be | 2469 | child->stop_pc = get_pc (child); |
94585166 | 2470 | if (handle_extended_wait (&child, wstat)) |
de0d863e DB |
2471 | { |
2472 | /* The event has been handled, so just return without | |
2473 | reporting it. */ | |
2474 | return NULL; | |
2475 | } | |
fa96cb38 PA |
2476 | } |
2477 | ||
80aea927 | 2478 | if (linux_wstatus_maybe_breakpoint (wstat)) |
582511be | 2479 | { |
e7ad2f14 | 2480 | if (save_stop_reason (child)) |
582511be PA |
2481 | have_stop_pc = 1; |
2482 | } | |
2483 | ||
2484 | if (!have_stop_pc) | |
2485 | child->stop_pc = get_pc (child); | |
2486 | ||
fa96cb38 PA |
2487 | if (WIFSTOPPED (wstat) && WSTOPSIG (wstat) == SIGSTOP |
2488 | && child->stop_expected) | |
2489 | { | |
2490 | if (debug_threads) | |
2491 | debug_printf ("Expected stop.\n"); | |
2492 | child->stop_expected = 0; | |
2493 | ||
2494 | if (thread->last_resume_kind == resume_stop) | |
2495 | { | |
2496 | /* We want to report the stop to the core. Treat the | |
2497 | SIGSTOP as a normal event. */ | |
2bf6fb9d PA |
2498 | if (debug_threads) |
2499 | debug_printf ("LLW: resume_stop SIGSTOP caught for %s.\n", | |
2500 | target_pid_to_str (ptid_of (thread))); | |
fa96cb38 PA |
2501 | } |
2502 | else if (stopping_threads != NOT_STOPPING_THREADS) | |
2503 | { | |
2504 | /* Stopping threads. We don't want this SIGSTOP to end up | |
582511be | 2505 | pending. */ |
2bf6fb9d PA |
2506 | if (debug_threads) |
2507 | debug_printf ("LLW: SIGSTOP caught for %s " | |
2508 | "while stopping threads.\n", | |
2509 | target_pid_to_str (ptid_of (thread))); | |
fa96cb38 PA |
2510 | return NULL; |
2511 | } | |
2512 | else | |
2513 | { | |
2bf6fb9d PA |
2514 | /* This is a delayed SIGSTOP. Filter out the event. */ |
2515 | if (debug_threads) | |
2516 | debug_printf ("LLW: %s %s, 0, 0 (discard delayed SIGSTOP)\n", | |
2517 | child->stepping ? "step" : "continue", | |
2518 | target_pid_to_str (ptid_of (thread))); | |
2519 | ||
fa96cb38 PA |
2520 | linux_resume_one_lwp (child, child->stepping, 0, NULL); |
2521 | return NULL; | |
2522 | } | |
2523 | } | |
2524 | ||
582511be PA |
2525 | child->status_pending_p = 1; |
2526 | child->status_pending = wstat; | |
fa96cb38 PA |
2527 | return child; |
2528 | } | |
2529 | ||
f79b145d YQ |
2530 | /* Return true if THREAD is doing hardware single step. */ |
2531 | ||
2532 | static int | |
2533 | maybe_hw_step (struct thread_info *thread) | |
2534 | { | |
2535 | if (can_hardware_single_step ()) | |
2536 | return 1; | |
2537 | else | |
2538 | { | |
3b9a79ef | 2539 | /* GDBserver must insert single-step breakpoint for software |
f79b145d | 2540 | single step. */ |
3b9a79ef | 2541 | gdb_assert (has_single_step_breakpoints (thread)); |
f79b145d YQ |
2542 | return 0; |
2543 | } | |
2544 | } | |
2545 | ||
20ba1ce6 PA |
2546 | /* Resume LWPs that are currently stopped without any pending status |
2547 | to report, but are resumed from the core's perspective. */ | |
2548 | ||
2549 | static void | |
9c80ecd6 | 2550 | resume_stopped_resumed_lwps (thread_info *thread) |
20ba1ce6 | 2551 | { |
20ba1ce6 PA |
2552 | struct lwp_info *lp = get_thread_lwp (thread); |
2553 | ||
2554 | if (lp->stopped | |
863d01bd | 2555 | && !lp->suspended |
20ba1ce6 | 2556 | && !lp->status_pending_p |
20ba1ce6 PA |
2557 | && thread->last_status.kind == TARGET_WAITKIND_IGNORE) |
2558 | { | |
8901d193 YQ |
2559 | int step = 0; |
2560 | ||
2561 | if (thread->last_resume_kind == resume_step) | |
2562 | step = maybe_hw_step (thread); | |
20ba1ce6 PA |
2563 | |
2564 | if (debug_threads) | |
2565 | debug_printf ("RSRL: resuming stopped-resumed LWP %s at %s: step=%d\n", | |
2566 | target_pid_to_str (ptid_of (thread)), | |
2567 | paddress (lp->stop_pc), | |
2568 | step); | |
2569 | ||
2570 | linux_resume_one_lwp (lp, step, GDB_SIGNAL_0, NULL); | |
2571 | } | |
2572 | } | |
2573 | ||
d16f3f6c TBA |
2574 | int |
2575 | linux_process_target::wait_for_event_filtered (ptid_t wait_ptid, | |
2576 | ptid_t filter_ptid, | |
2577 | int *wstatp, int options) | |
0d62e5e8 | 2578 | { |
d86d4aaf | 2579 | struct thread_info *event_thread; |
d50171e4 | 2580 | struct lwp_info *event_child, *requested_child; |
fa96cb38 | 2581 | sigset_t block_mask, prev_mask; |
d50171e4 | 2582 | |
fa96cb38 | 2583 | retry: |
d86d4aaf DE |
2584 | /* N.B. event_thread points to the thread_info struct that contains |
2585 | event_child. Keep them in sync. */ | |
2586 | event_thread = NULL; | |
d50171e4 PA |
2587 | event_child = NULL; |
2588 | requested_child = NULL; | |
0d62e5e8 | 2589 | |
95954743 | 2590 | /* Check for a lwp with a pending status. */ |
bd99dc85 | 2591 | |
d7e15655 | 2592 | if (filter_ptid == minus_one_ptid || filter_ptid.is_pid ()) |
0d62e5e8 | 2593 | { |
83e1b6c1 SM |
2594 | event_thread = find_thread_in_random ([&] (thread_info *thread) |
2595 | { | |
2596 | return status_pending_p_callback (thread, filter_ptid); | |
2597 | }); | |
2598 | ||
d86d4aaf DE |
2599 | if (event_thread != NULL) |
2600 | event_child = get_thread_lwp (event_thread); | |
2601 | if (debug_threads && event_thread) | |
2602 | debug_printf ("Got a pending child %ld\n", lwpid_of (event_thread)); | |
0d62e5e8 | 2603 | } |
d7e15655 | 2604 | else if (filter_ptid != null_ptid) |
0d62e5e8 | 2605 | { |
fa96cb38 | 2606 | requested_child = find_lwp_pid (filter_ptid); |
d50171e4 | 2607 | |
bde24c0a | 2608 | if (stopping_threads == NOT_STOPPING_THREADS |
fa593d66 | 2609 | && requested_child->status_pending_p |
229d26fc SM |
2610 | && (requested_child->collecting_fast_tracepoint |
2611 | != fast_tpoint_collect_result::not_collecting)) | |
fa593d66 PA |
2612 | { |
2613 | enqueue_one_deferred_signal (requested_child, | |
2614 | &requested_child->status_pending); | |
2615 | requested_child->status_pending_p = 0; | |
2616 | requested_child->status_pending = 0; | |
2617 | linux_resume_one_lwp (requested_child, 0, 0, NULL); | |
2618 | } | |
2619 | ||
2620 | if (requested_child->suspended | |
2621 | && requested_child->status_pending_p) | |
38e08fca GB |
2622 | { |
2623 | internal_error (__FILE__, __LINE__, | |
2624 | "requesting an event out of a" | |
2625 | " suspended child?"); | |
2626 | } | |
fa593d66 | 2627 | |
d50171e4 | 2628 | if (requested_child->status_pending_p) |
d86d4aaf DE |
2629 | { |
2630 | event_child = requested_child; | |
2631 | event_thread = get_lwp_thread (event_child); | |
2632 | } | |
0d62e5e8 | 2633 | } |
611cb4a5 | 2634 | |
0d62e5e8 DJ |
2635 | if (event_child != NULL) |
2636 | { | |
bd99dc85 | 2637 | if (debug_threads) |
87ce2a04 | 2638 | debug_printf ("Got an event from pending child %ld (%04x)\n", |
d86d4aaf | 2639 | lwpid_of (event_thread), event_child->status_pending); |
fa96cb38 | 2640 | *wstatp = event_child->status_pending; |
bd99dc85 PA |
2641 | event_child->status_pending_p = 0; |
2642 | event_child->status_pending = 0; | |
0bfdf32f | 2643 | current_thread = event_thread; |
d86d4aaf | 2644 | return lwpid_of (event_thread); |
0d62e5e8 DJ |
2645 | } |
2646 | ||
fa96cb38 PA |
2647 | /* But if we don't find a pending event, we'll have to wait. |
2648 | ||
2649 | We only enter this loop if no process has a pending wait status. | |
2650 | Thus any action taken in response to a wait status inside this | |
2651 | loop is responding as soon as we detect the status, not after any | |
2652 | pending events. */ | |
d8301ad1 | 2653 | |
fa96cb38 PA |
2654 | /* Make sure SIGCHLD is blocked until the sigsuspend below. Block |
2655 | all signals while here. */ | |
2656 | sigfillset (&block_mask); | |
21987b9c | 2657 | gdb_sigmask (SIG_BLOCK, &block_mask, &prev_mask); |
fa96cb38 | 2658 | |
582511be PA |
2659 | /* Always pull all events out of the kernel. We'll randomly select |
2660 | an event LWP out of all that have events, to prevent | |
2661 | starvation. */ | |
fa96cb38 | 2662 | while (event_child == NULL) |
0d62e5e8 | 2663 | { |
fa96cb38 | 2664 | pid_t ret = 0; |
0d62e5e8 | 2665 | |
fa96cb38 PA |
2666 | /* Always use -1 and WNOHANG, due to couple of a kernel/ptrace |
2667 | quirks: | |
0d62e5e8 | 2668 | |
fa96cb38 PA |
2669 | - If the thread group leader exits while other threads in the |
2670 | thread group still exist, waitpid(TGID, ...) hangs. That | |
2671 | waitpid won't return an exit status until the other threads | |
2672 | in the group are reaped. | |
611cb4a5 | 2673 | |
fa96cb38 PA |
2674 | - When a non-leader thread execs, that thread just vanishes |
2675 | without reporting an exit (so we'd hang if we waited for it | |
2676 | explicitly in that case). The exec event is reported to | |
94585166 | 2677 | the TGID pid. */ |
fa96cb38 PA |
2678 | errno = 0; |
2679 | ret = my_waitpid (-1, wstatp, options | WNOHANG); | |
d8301ad1 | 2680 | |
fa96cb38 PA |
2681 | if (debug_threads) |
2682 | debug_printf ("LWFE: waitpid(-1, ...) returned %d, %s\n", | |
6d91ce9a | 2683 | ret, errno ? safe_strerror (errno) : "ERRNO-OK"); |
0d62e5e8 | 2684 | |
fa96cb38 | 2685 | if (ret > 0) |
0d62e5e8 | 2686 | { |
89be2091 | 2687 | if (debug_threads) |
bd99dc85 | 2688 | { |
fa96cb38 PA |
2689 | debug_printf ("LLW: waitpid %ld received %s\n", |
2690 | (long) ret, status_to_str (*wstatp)); | |
bd99dc85 | 2691 | } |
89be2091 | 2692 | |
582511be PA |
2693 | /* Filter all events. IOW, leave all events pending. We'll |
2694 | randomly select an event LWP out of all that have events | |
2695 | below. */ | |
d16f3f6c | 2696 | filter_event (ret, *wstatp); |
fa96cb38 PA |
2697 | /* Retry until nothing comes out of waitpid. A single |
2698 | SIGCHLD can indicate more than one child stopped. */ | |
89be2091 DJ |
2699 | continue; |
2700 | } | |
2701 | ||
20ba1ce6 PA |
2702 | /* Now that we've pulled all events out of the kernel, resume |
2703 | LWPs that don't have an interesting event to report. */ | |
2704 | if (stopping_threads == NOT_STOPPING_THREADS) | |
f0045347 | 2705 | for_each_thread (resume_stopped_resumed_lwps); |
20ba1ce6 PA |
2706 | |
2707 | /* ... and find an LWP with a status to report to the core, if | |
2708 | any. */ | |
83e1b6c1 SM |
2709 | event_thread = find_thread_in_random ([&] (thread_info *thread) |
2710 | { | |
2711 | return status_pending_p_callback (thread, filter_ptid); | |
2712 | }); | |
2713 | ||
582511be PA |
2714 | if (event_thread != NULL) |
2715 | { | |
2716 | event_child = get_thread_lwp (event_thread); | |
2717 | *wstatp = event_child->status_pending; | |
2718 | event_child->status_pending_p = 0; | |
2719 | event_child->status_pending = 0; | |
2720 | break; | |
2721 | } | |
2722 | ||
fa96cb38 PA |
2723 | /* Check for zombie thread group leaders. Those can't be reaped |
2724 | until all other threads in the thread group are. */ | |
2725 | check_zombie_leaders (); | |
2726 | ||
a1385b7b SM |
2727 | auto not_stopped = [&] (thread_info *thread) |
2728 | { | |
2729 | return not_stopped_callback (thread, wait_ptid); | |
2730 | }; | |
2731 | ||
fa96cb38 PA |
2732 | /* If there are no resumed children left in the set of LWPs we |
2733 | want to wait for, bail. We can't just block in | |
2734 | waitpid/sigsuspend, because lwps might have been left stopped | |
2735 | in trace-stop state, and we'd be stuck forever waiting for | |
2736 | their status to change (which would only happen if we resumed | |
2737 | them). Even if WNOHANG is set, this return code is preferred | |
2738 | over 0 (below), as it is more detailed. */ | |
a1385b7b | 2739 | if (find_thread (not_stopped) == NULL) |
a6dbe5df | 2740 | { |
fa96cb38 PA |
2741 | if (debug_threads) |
2742 | debug_printf ("LLW: exit (no unwaited-for LWP)\n"); | |
21987b9c | 2743 | gdb_sigmask (SIG_SETMASK, &prev_mask, NULL); |
fa96cb38 | 2744 | return -1; |
a6dbe5df PA |
2745 | } |
2746 | ||
fa96cb38 PA |
2747 | /* No interesting event to report to the caller. */ |
2748 | if ((options & WNOHANG)) | |
24a09b5f | 2749 | { |
fa96cb38 PA |
2750 | if (debug_threads) |
2751 | debug_printf ("WNOHANG set, no event found\n"); | |
2752 | ||
21987b9c | 2753 | gdb_sigmask (SIG_SETMASK, &prev_mask, NULL); |
fa96cb38 | 2754 | return 0; |
24a09b5f DJ |
2755 | } |
2756 | ||
fa96cb38 PA |
2757 | /* Block until we get an event reported with SIGCHLD. */ |
2758 | if (debug_threads) | |
2759 | debug_printf ("sigsuspend'ing\n"); | |
d50171e4 | 2760 | |
fa96cb38 | 2761 | sigsuspend (&prev_mask); |
21987b9c | 2762 | gdb_sigmask (SIG_SETMASK, &prev_mask, NULL); |
fa96cb38 PA |
2763 | goto retry; |
2764 | } | |
d50171e4 | 2765 | |
21987b9c | 2766 | gdb_sigmask (SIG_SETMASK, &prev_mask, NULL); |
d50171e4 | 2767 | |
0bfdf32f | 2768 | current_thread = event_thread; |
d50171e4 | 2769 | |
fa96cb38 PA |
2770 | return lwpid_of (event_thread); |
2771 | } | |
2772 | ||
d16f3f6c TBA |
2773 | int |
2774 | linux_process_target::wait_for_event (ptid_t ptid, int *wstatp, int options) | |
fa96cb38 | 2775 | { |
d16f3f6c | 2776 | return wait_for_event_filtered (ptid, ptid, wstatp, options); |
611cb4a5 DJ |
2777 | } |
2778 | ||
6bf5e0ba PA |
2779 | /* Select one LWP out of those that have events pending. */ |
2780 | ||
2781 | static void | |
2782 | select_event_lwp (struct lwp_info **orig_lp) | |
2783 | { | |
582511be PA |
2784 | struct thread_info *event_thread = NULL; |
2785 | ||
2786 | /* In all-stop, give preference to the LWP that is being | |
2787 | single-stepped. There will be at most one, and it's the LWP that | |
2788 | the core is most interested in. If we didn't do this, then we'd | |
2789 | have to handle pending step SIGTRAPs somehow in case the core | |
2790 | later continues the previously-stepped thread, otherwise we'd | |
2791 | report the pending SIGTRAP, and the core, not having stepped the | |
2792 | thread, wouldn't understand what the trap was for, and therefore | |
2793 | would report it to the user as a random signal. */ | |
2794 | if (!non_stop) | |
6bf5e0ba | 2795 | { |
39a64da5 SM |
2796 | event_thread = find_thread ([] (thread_info *thread) |
2797 | { | |
2798 | lwp_info *lp = get_thread_lwp (thread); | |
2799 | ||
2800 | return (thread->last_status.kind == TARGET_WAITKIND_IGNORE | |
2801 | && thread->last_resume_kind == resume_step | |
2802 | && lp->status_pending_p); | |
2803 | }); | |
2804 | ||
582511be PA |
2805 | if (event_thread != NULL) |
2806 | { | |
2807 | if (debug_threads) | |
2808 | debug_printf ("SEL: Select single-step %s\n", | |
2809 | target_pid_to_str (ptid_of (event_thread))); | |
2810 | } | |
6bf5e0ba | 2811 | } |
582511be | 2812 | if (event_thread == NULL) |
6bf5e0ba PA |
2813 | { |
2814 | /* No single-stepping LWP. Select one at random, out of those | |
b90fc188 | 2815 | which have had events. */ |
6bf5e0ba | 2816 | |
b0319eaa | 2817 | event_thread = find_thread_in_random ([&] (thread_info *thread) |
39a64da5 SM |
2818 | { |
2819 | lwp_info *lp = get_thread_lwp (thread); | |
2820 | ||
b0319eaa TT |
2821 | /* Only resumed LWPs that have an event pending. */ |
2822 | return (thread->last_status.kind == TARGET_WAITKIND_IGNORE | |
2823 | && lp->status_pending_p); | |
39a64da5 | 2824 | }); |
6bf5e0ba PA |
2825 | } |
2826 | ||
d86d4aaf | 2827 | if (event_thread != NULL) |
6bf5e0ba | 2828 | { |
d86d4aaf DE |
2829 | struct lwp_info *event_lp = get_thread_lwp (event_thread); |
2830 | ||
6bf5e0ba PA |
2831 | /* Switch the event LWP. */ |
2832 | *orig_lp = event_lp; | |
2833 | } | |
2834 | } | |
2835 | ||
7984d532 PA |
2836 | /* Decrement the suspend count of all LWPs, except EXCEPT, if non |
2837 | NULL. */ | |
2838 | ||
2839 | static void | |
2840 | unsuspend_all_lwps (struct lwp_info *except) | |
2841 | { | |
139720c5 SM |
2842 | for_each_thread ([&] (thread_info *thread) |
2843 | { | |
2844 | lwp_info *lwp = get_thread_lwp (thread); | |
2845 | ||
2846 | if (lwp != except) | |
2847 | lwp_suspended_decr (lwp); | |
2848 | }); | |
7984d532 PA |
2849 | } |
2850 | ||
fcb056a5 | 2851 | static bool stuck_in_jump_pad_callback (thread_info *thread); |
5a6b0a41 | 2852 | static bool lwp_running (thread_info *thread); |
fa593d66 PA |
2853 | |
2854 | /* Stabilize threads (move out of jump pads). | |
2855 | ||
2856 | If a thread is midway collecting a fast tracepoint, we need to | |
2857 | finish the collection and move it out of the jump pad before | |
2858 | reporting the signal. | |
2859 | ||
2860 | This avoids recursion while collecting (when a signal arrives | |
2861 | midway, and the signal handler itself collects), which would trash | |
2862 | the trace buffer. In case the user set a breakpoint in a signal | |
2863 | handler, this avoids the backtrace showing the jump pad, etc.. | |
2864 | Most importantly, there are certain things we can't do safely if | |
2865 | threads are stopped in a jump pad (or in its callee's). For | |
2866 | example: | |
2867 | ||
2868 | - starting a new trace run. A thread still collecting the | |
2869 | previous run, could trash the trace buffer when resumed. The trace | |
2870 | buffer control structures would have been reset but the thread had | |
2871 | no way to tell. The thread could even midway memcpy'ing to the | |
2872 | buffer, which would mean that when resumed, it would clobber the | |
2873 | trace buffer that had been set for a new run. | |
2874 | ||
2875 | - we can't rewrite/reuse the jump pads for new tracepoints | |
2876 | safely. Say you do tstart while a thread is stopped midway while | |
2877 | collecting. When the thread is later resumed, it finishes the | |
2878 | collection, and returns to the jump pad, to execute the original | |
2879 | instruction that was under the tracepoint jump at the time the | |
2880 | older run had been started. If the jump pad had been rewritten | |
2881 | since for something else in the new run, the thread would now | |
2882 | execute the wrong / random instructions. */ | |
2883 | ||
5c9eb2f2 TBA |
2884 | void |
2885 | linux_process_target::stabilize_threads () | |
fa593d66 | 2886 | { |
fcb056a5 | 2887 | thread_info *thread_stuck = find_thread (stuck_in_jump_pad_callback); |
fa593d66 | 2888 | |
d86d4aaf | 2889 | if (thread_stuck != NULL) |
fa593d66 | 2890 | { |
b4d51a55 | 2891 | if (debug_threads) |
87ce2a04 | 2892 | debug_printf ("can't stabilize, LWP %ld is stuck in jump pad\n", |
d86d4aaf | 2893 | lwpid_of (thread_stuck)); |
fa593d66 PA |
2894 | return; |
2895 | } | |
2896 | ||
fcb056a5 | 2897 | thread_info *saved_thread = current_thread; |
fa593d66 PA |
2898 | |
2899 | stabilizing_threads = 1; | |
2900 | ||
2901 | /* Kick 'em all. */ | |
d16f3f6c TBA |
2902 | for_each_thread ([this] (thread_info *thread) |
2903 | { | |
2904 | move_out_of_jump_pad (thread); | |
2905 | }); | |
fa593d66 PA |
2906 | |
2907 | /* Loop until all are stopped out of the jump pads. */ | |
5a6b0a41 | 2908 | while (find_thread (lwp_running) != NULL) |
fa593d66 PA |
2909 | { |
2910 | struct target_waitstatus ourstatus; | |
2911 | struct lwp_info *lwp; | |
fa593d66 PA |
2912 | int wstat; |
2913 | ||
2914 | /* Note that we go through the full wait even loop. While | |
2915 | moving threads out of jump pad, we need to be able to step | |
2916 | over internal breakpoints and such. */ | |
d16f3f6c | 2917 | wait_1 (minus_one_ptid, &ourstatus, 0); |
fa593d66 PA |
2918 | |
2919 | if (ourstatus.kind == TARGET_WAITKIND_STOPPED) | |
2920 | { | |
0bfdf32f | 2921 | lwp = get_thread_lwp (current_thread); |
fa593d66 PA |
2922 | |
2923 | /* Lock it. */ | |
863d01bd | 2924 | lwp_suspended_inc (lwp); |
fa593d66 | 2925 | |
a493e3e2 | 2926 | if (ourstatus.value.sig != GDB_SIGNAL_0 |
0bfdf32f | 2927 | || current_thread->last_resume_kind == resume_stop) |
fa593d66 | 2928 | { |
2ea28649 | 2929 | wstat = W_STOPCODE (gdb_signal_to_host (ourstatus.value.sig)); |
fa593d66 PA |
2930 | enqueue_one_deferred_signal (lwp, &wstat); |
2931 | } | |
2932 | } | |
2933 | } | |
2934 | ||
fcdad592 | 2935 | unsuspend_all_lwps (NULL); |
fa593d66 PA |
2936 | |
2937 | stabilizing_threads = 0; | |
2938 | ||
0bfdf32f | 2939 | current_thread = saved_thread; |
fa593d66 | 2940 | |
b4d51a55 | 2941 | if (debug_threads) |
fa593d66 | 2942 | { |
fcb056a5 SM |
2943 | thread_stuck = find_thread (stuck_in_jump_pad_callback); |
2944 | ||
d86d4aaf | 2945 | if (thread_stuck != NULL) |
87ce2a04 | 2946 | debug_printf ("couldn't stabilize, LWP %ld got stuck in jump pad\n", |
d86d4aaf | 2947 | lwpid_of (thread_stuck)); |
fa593d66 PA |
2948 | } |
2949 | } | |
2950 | ||
582511be PA |
2951 | /* Convenience function that is called when the kernel reports an |
2952 | event that is not passed out to GDB. */ | |
2953 | ||
2954 | static ptid_t | |
2955 | ignore_event (struct target_waitstatus *ourstatus) | |
2956 | { | |
2957 | /* If we got an event, there may still be others, as a single | |
2958 | SIGCHLD can indicate more than one child stopped. This forces | |
2959 | another target_wait call. */ | |
2960 | async_file_mark (); | |
2961 | ||
2962 | ourstatus->kind = TARGET_WAITKIND_IGNORE; | |
2963 | return null_ptid; | |
2964 | } | |
2965 | ||
65706a29 PA |
2966 | /* Convenience function that is called when the kernel reports an exit |
2967 | event. This decides whether to report the event to GDB as a | |
2968 | process exit event, a thread exit event, or to suppress the | |
2969 | event. */ | |
2970 | ||
2971 | static ptid_t | |
2972 | filter_exit_event (struct lwp_info *event_child, | |
2973 | struct target_waitstatus *ourstatus) | |
2974 | { | |
c12a5089 | 2975 | client_state &cs = get_client_state (); |
65706a29 PA |
2976 | struct thread_info *thread = get_lwp_thread (event_child); |
2977 | ptid_t ptid = ptid_of (thread); | |
2978 | ||
2979 | if (!last_thread_of_process_p (pid_of (thread))) | |
2980 | { | |
c12a5089 | 2981 | if (cs.report_thread_events) |
65706a29 PA |
2982 | ourstatus->kind = TARGET_WAITKIND_THREAD_EXITED; |
2983 | else | |
2984 | ourstatus->kind = TARGET_WAITKIND_IGNORE; | |
2985 | ||
2986 | delete_lwp (event_child); | |
2987 | } | |
2988 | return ptid; | |
2989 | } | |
2990 | ||
82075af2 JS |
2991 | /* Returns 1 if GDB is interested in any event_child syscalls. */ |
2992 | ||
2993 | static int | |
2994 | gdb_catching_syscalls_p (struct lwp_info *event_child) | |
2995 | { | |
2996 | struct thread_info *thread = get_lwp_thread (event_child); | |
2997 | struct process_info *proc = get_thread_process (thread); | |
2998 | ||
f27866ba | 2999 | return !proc->syscalls_to_catch.empty (); |
82075af2 JS |
3000 | } |
3001 | ||
3002 | /* Returns 1 if GDB is interested in the event_child syscall. | |
3003 | Only to be called when stopped reason is SYSCALL_SIGTRAP. */ | |
3004 | ||
3005 | static int | |
3006 | gdb_catch_this_syscall_p (struct lwp_info *event_child) | |
3007 | { | |
4cc32bec | 3008 | int sysno; |
82075af2 JS |
3009 | struct thread_info *thread = get_lwp_thread (event_child); |
3010 | struct process_info *proc = get_thread_process (thread); | |
3011 | ||
f27866ba | 3012 | if (proc->syscalls_to_catch.empty ()) |
82075af2 JS |
3013 | return 0; |
3014 | ||
f27866ba | 3015 | if (proc->syscalls_to_catch[0] == ANY_SYSCALL) |
82075af2 JS |
3016 | return 1; |
3017 | ||
4cc32bec | 3018 | get_syscall_trapinfo (event_child, &sysno); |
f27866ba SM |
3019 | |
3020 | for (int iter : proc->syscalls_to_catch) | |
82075af2 JS |
3021 | if (iter == sysno) |
3022 | return 1; | |
3023 | ||
3024 | return 0; | |
3025 | } | |
3026 | ||
d16f3f6c TBA |
3027 | ptid_t |
3028 | linux_process_target::wait_1 (ptid_t ptid, target_waitstatus *ourstatus, | |
3029 | int target_options) | |
da6d8c04 | 3030 | { |
c12a5089 | 3031 | client_state &cs = get_client_state (); |
e5f1222d | 3032 | int w; |
fc7238bb | 3033 | struct lwp_info *event_child; |
bd99dc85 | 3034 | int options; |
bd99dc85 | 3035 | int pid; |
6bf5e0ba PA |
3036 | int step_over_finished; |
3037 | int bp_explains_trap; | |
3038 | int maybe_internal_trap; | |
3039 | int report_to_gdb; | |
219f2f23 | 3040 | int trace_event; |
c2d6af84 | 3041 | int in_step_range; |
f2faf941 | 3042 | int any_resumed; |
bd99dc85 | 3043 | |
87ce2a04 DE |
3044 | if (debug_threads) |
3045 | { | |
3046 | debug_enter (); | |
d16f3f6c | 3047 | debug_printf ("wait_1: [%s]\n", target_pid_to_str (ptid)); |
87ce2a04 DE |
3048 | } |
3049 | ||
bd99dc85 PA |
3050 | /* Translate generic target options into linux options. */ |
3051 | options = __WALL; | |
3052 | if (target_options & TARGET_WNOHANG) | |
3053 | options |= WNOHANG; | |
0d62e5e8 | 3054 | |
fa593d66 PA |
3055 | bp_explains_trap = 0; |
3056 | trace_event = 0; | |
c2d6af84 | 3057 | in_step_range = 0; |
bd99dc85 PA |
3058 | ourstatus->kind = TARGET_WAITKIND_IGNORE; |
3059 | ||
83e1b6c1 SM |
3060 | auto status_pending_p_any = [&] (thread_info *thread) |
3061 | { | |
3062 | return status_pending_p_callback (thread, minus_one_ptid); | |
3063 | }; | |
3064 | ||
a1385b7b SM |
3065 | auto not_stopped = [&] (thread_info *thread) |
3066 | { | |
3067 | return not_stopped_callback (thread, minus_one_ptid); | |
3068 | }; | |
3069 | ||
f2faf941 | 3070 | /* Find a resumed LWP, if any. */ |
83e1b6c1 | 3071 | if (find_thread (status_pending_p_any) != NULL) |
f2faf941 | 3072 | any_resumed = 1; |
a1385b7b | 3073 | else if (find_thread (not_stopped) != NULL) |
f2faf941 PA |
3074 | any_resumed = 1; |
3075 | else | |
3076 | any_resumed = 0; | |
3077 | ||
d7e15655 | 3078 | if (step_over_bkpt == null_ptid) |
d16f3f6c | 3079 | pid = wait_for_event (ptid, &w, options); |
6bf5e0ba PA |
3080 | else |
3081 | { | |
3082 | if (debug_threads) | |
87ce2a04 DE |
3083 | debug_printf ("step_over_bkpt set [%s], doing a blocking wait\n", |
3084 | target_pid_to_str (step_over_bkpt)); | |
d16f3f6c | 3085 | pid = wait_for_event (step_over_bkpt, &w, options & ~WNOHANG); |
6bf5e0ba PA |
3086 | } |
3087 | ||
f2faf941 | 3088 | if (pid == 0 || (pid == -1 && !any_resumed)) |
87ce2a04 | 3089 | { |
fa96cb38 PA |
3090 | gdb_assert (target_options & TARGET_WNOHANG); |
3091 | ||
87ce2a04 DE |
3092 | if (debug_threads) |
3093 | { | |
d16f3f6c | 3094 | debug_printf ("wait_1 ret = null_ptid, " |
fa96cb38 | 3095 | "TARGET_WAITKIND_IGNORE\n"); |
87ce2a04 DE |
3096 | debug_exit (); |
3097 | } | |
fa96cb38 PA |
3098 | |
3099 | ourstatus->kind = TARGET_WAITKIND_IGNORE; | |
87ce2a04 DE |
3100 | return null_ptid; |
3101 | } | |
fa96cb38 PA |
3102 | else if (pid == -1) |
3103 | { | |
3104 | if (debug_threads) | |
3105 | { | |
d16f3f6c | 3106 | debug_printf ("wait_1 ret = null_ptid, " |
fa96cb38 PA |
3107 | "TARGET_WAITKIND_NO_RESUMED\n"); |
3108 | debug_exit (); | |
3109 | } | |
bd99dc85 | 3110 | |
fa96cb38 PA |
3111 | ourstatus->kind = TARGET_WAITKIND_NO_RESUMED; |
3112 | return null_ptid; | |
3113 | } | |
0d62e5e8 | 3114 | |
0bfdf32f | 3115 | event_child = get_thread_lwp (current_thread); |
0d62e5e8 | 3116 | |
d16f3f6c | 3117 | /* wait_for_event only returns an exit status for the last |
fa96cb38 PA |
3118 | child of a process. Report it. */ |
3119 | if (WIFEXITED (w) || WIFSIGNALED (w)) | |
da6d8c04 | 3120 | { |
fa96cb38 | 3121 | if (WIFEXITED (w)) |
0d62e5e8 | 3122 | { |
fa96cb38 PA |
3123 | ourstatus->kind = TARGET_WAITKIND_EXITED; |
3124 | ourstatus->value.integer = WEXITSTATUS (w); | |
bd99dc85 | 3125 | |
fa96cb38 | 3126 | if (debug_threads) |
bd99dc85 | 3127 | { |
d16f3f6c | 3128 | debug_printf ("wait_1 ret = %s, exited with " |
fa96cb38 | 3129 | "retcode %d\n", |
0bfdf32f | 3130 | target_pid_to_str (ptid_of (current_thread)), |
fa96cb38 PA |
3131 | WEXITSTATUS (w)); |
3132 | debug_exit (); | |
bd99dc85 | 3133 | } |
fa96cb38 PA |
3134 | } |
3135 | else | |
3136 | { | |
3137 | ourstatus->kind = TARGET_WAITKIND_SIGNALLED; | |
3138 | ourstatus->value.sig = gdb_signal_from_host (WTERMSIG (w)); | |
5b1c542e | 3139 | |
fa96cb38 PA |
3140 | if (debug_threads) |
3141 | { | |
d16f3f6c | 3142 | debug_printf ("wait_1 ret = %s, terminated with " |
fa96cb38 | 3143 | "signal %d\n", |
0bfdf32f | 3144 | target_pid_to_str (ptid_of (current_thread)), |
fa96cb38 PA |
3145 | WTERMSIG (w)); |
3146 | debug_exit (); | |
3147 | } | |
0d62e5e8 | 3148 | } |
fa96cb38 | 3149 | |
65706a29 PA |
3150 | if (ourstatus->kind == TARGET_WAITKIND_EXITED) |
3151 | return filter_exit_event (event_child, ourstatus); | |
3152 | ||
0bfdf32f | 3153 | return ptid_of (current_thread); |
da6d8c04 DJ |
3154 | } |
3155 | ||
2d97cd35 AT |
3156 | /* If step-over executes a breakpoint instruction, in the case of a |
3157 | hardware single step it means a gdb/gdbserver breakpoint had been | |
3158 | planted on top of a permanent breakpoint, in the case of a software | |
3159 | single step it may just mean that gdbserver hit the reinsert breakpoint. | |
e7ad2f14 | 3160 | The PC has been adjusted by save_stop_reason to point at |
2d97cd35 AT |
3161 | the breakpoint address. |
3162 | So in the case of the hardware single step advance the PC manually | |
3163 | past the breakpoint and in the case of software single step advance only | |
3b9a79ef | 3164 | if it's not the single_step_breakpoint we are hitting. |
2d97cd35 AT |
3165 | This avoids that a program would keep trapping a permanent breakpoint |
3166 | forever. */ | |
d7e15655 | 3167 | if (step_over_bkpt != null_ptid |
2d97cd35 AT |
3168 | && event_child->stop_reason == TARGET_STOPPED_BY_SW_BREAKPOINT |
3169 | && (event_child->stepping | |
3b9a79ef | 3170 | || !single_step_breakpoint_inserted_here (event_child->stop_pc))) |
8090aef2 | 3171 | { |
dd373349 AT |
3172 | int increment_pc = 0; |
3173 | int breakpoint_kind = 0; | |
3174 | CORE_ADDR stop_pc = event_child->stop_pc; | |
3175 | ||
d16f3f6c TBA |
3176 | breakpoint_kind = breakpoint_kind_from_current_state (&stop_pc); |
3177 | sw_breakpoint_from_kind (breakpoint_kind, &increment_pc); | |
8090aef2 PA |
3178 | |
3179 | if (debug_threads) | |
3180 | { | |
3181 | debug_printf ("step-over for %s executed software breakpoint\n", | |
3182 | target_pid_to_str (ptid_of (current_thread))); | |
3183 | } | |
3184 | ||
3185 | if (increment_pc != 0) | |
3186 | { | |
3187 | struct regcache *regcache | |
3188 | = get_thread_regcache (current_thread, 1); | |
3189 | ||
3190 | event_child->stop_pc += increment_pc; | |
3191 | (*the_low_target.set_pc) (regcache, event_child->stop_pc); | |
3192 | ||
3193 | if (!(*the_low_target.breakpoint_at) (event_child->stop_pc)) | |
15c66dd6 | 3194 | event_child->stop_reason = TARGET_STOPPED_BY_NO_REASON; |
8090aef2 PA |
3195 | } |
3196 | } | |
3197 | ||
6bf5e0ba PA |
3198 | /* If this event was not handled before, and is not a SIGTRAP, we |
3199 | report it. SIGILL and SIGSEGV are also treated as traps in case | |
3200 | a breakpoint is inserted at the current PC. If this target does | |
3201 | not support internal breakpoints at all, we also report the | |
3202 | SIGTRAP without further processing; it's of no concern to us. */ | |
3203 | maybe_internal_trap | |
3204 | = (supports_breakpoints () | |
3205 | && (WSTOPSIG (w) == SIGTRAP | |
3206 | || ((WSTOPSIG (w) == SIGILL | |
3207 | || WSTOPSIG (w) == SIGSEGV) | |
3208 | && (*the_low_target.breakpoint_at) (event_child->stop_pc)))); | |
3209 | ||
3210 | if (maybe_internal_trap) | |
3211 | { | |
3212 | /* Handle anything that requires bookkeeping before deciding to | |
3213 | report the event or continue waiting. */ | |
3214 | ||
3215 | /* First check if we can explain the SIGTRAP with an internal | |
3216 | breakpoint, or if we should possibly report the event to GDB. | |
3217 | Do this before anything that may remove or insert a | |
3218 | breakpoint. */ | |
3219 | bp_explains_trap = breakpoint_inserted_here (event_child->stop_pc); | |
3220 | ||
3221 | /* We have a SIGTRAP, possibly a step-over dance has just | |
3222 | finished. If so, tweak the state machine accordingly, | |
3b9a79ef YQ |
3223 | reinsert breakpoints and delete any single-step |
3224 | breakpoints. */ | |
6bf5e0ba PA |
3225 | step_over_finished = finish_step_over (event_child); |
3226 | ||
3227 | /* Now invoke the callbacks of any internal breakpoints there. */ | |
3228 | check_breakpoints (event_child->stop_pc); | |
3229 | ||
219f2f23 PA |
3230 | /* Handle tracepoint data collecting. This may overflow the |
3231 | trace buffer, and cause a tracing stop, removing | |
3232 | breakpoints. */ | |
3233 | trace_event = handle_tracepoints (event_child); | |
3234 | ||
6bf5e0ba PA |
3235 | if (bp_explains_trap) |
3236 | { | |
6bf5e0ba | 3237 | if (debug_threads) |
87ce2a04 | 3238 | debug_printf ("Hit a gdbserver breakpoint.\n"); |
6bf5e0ba PA |
3239 | } |
3240 | } | |
3241 | else | |
3242 | { | |
3243 | /* We have some other signal, possibly a step-over dance was in | |
3244 | progress, and it should be cancelled too. */ | |
3245 | step_over_finished = finish_step_over (event_child); | |
fa593d66 PA |
3246 | } |
3247 | ||
3248 | /* We have all the data we need. Either report the event to GDB, or | |
3249 | resume threads and keep waiting for more. */ | |
3250 | ||
3251 | /* If we're collecting a fast tracepoint, finish the collection and | |
3252 | move out of the jump pad before delivering a signal. See | |
3253 | linux_stabilize_threads. */ | |
3254 | ||
3255 | if (WIFSTOPPED (w) | |
3256 | && WSTOPSIG (w) != SIGTRAP | |
3257 | && supports_fast_tracepoints () | |
58b4daa5 | 3258 | && agent_loaded_p ()) |
fa593d66 PA |
3259 | { |
3260 | if (debug_threads) | |
87ce2a04 DE |
3261 | debug_printf ("Got signal %d for LWP %ld. Check if we need " |
3262 | "to defer or adjust it.\n", | |
0bfdf32f | 3263 | WSTOPSIG (w), lwpid_of (current_thread)); |
fa593d66 PA |
3264 | |
3265 | /* Allow debugging the jump pad itself. */ | |
0bfdf32f | 3266 | if (current_thread->last_resume_kind != resume_step |
fa593d66 PA |
3267 | && maybe_move_out_of_jump_pad (event_child, &w)) |
3268 | { | |
3269 | enqueue_one_deferred_signal (event_child, &w); | |
3270 | ||
3271 | if (debug_threads) | |
87ce2a04 | 3272 | debug_printf ("Signal %d for LWP %ld deferred (in jump pad)\n", |
0bfdf32f | 3273 | WSTOPSIG (w), lwpid_of (current_thread)); |
fa593d66 PA |
3274 | |
3275 | linux_resume_one_lwp (event_child, 0, 0, NULL); | |
582511be | 3276 | |
edeeb602 YQ |
3277 | if (debug_threads) |
3278 | debug_exit (); | |
582511be | 3279 | return ignore_event (ourstatus); |
fa593d66 PA |
3280 | } |
3281 | } | |
219f2f23 | 3282 | |
229d26fc SM |
3283 | if (event_child->collecting_fast_tracepoint |
3284 | != fast_tpoint_collect_result::not_collecting) | |
fa593d66 PA |
3285 | { |
3286 | if (debug_threads) | |
87ce2a04 DE |
3287 | debug_printf ("LWP %ld was trying to move out of the jump pad (%d). " |
3288 | "Check if we're already there.\n", | |
0bfdf32f | 3289 | lwpid_of (current_thread), |
229d26fc | 3290 | (int) event_child->collecting_fast_tracepoint); |
fa593d66 PA |
3291 | |
3292 | trace_event = 1; | |
3293 | ||
3294 | event_child->collecting_fast_tracepoint | |
3295 | = linux_fast_tracepoint_collecting (event_child, NULL); | |
3296 | ||
229d26fc SM |
3297 | if (event_child->collecting_fast_tracepoint |
3298 | != fast_tpoint_collect_result::before_insn) | |
fa593d66 PA |
3299 | { |
3300 | /* No longer need this breakpoint. */ | |
3301 | if (event_child->exit_jump_pad_bkpt != NULL) | |
3302 | { | |
3303 | if (debug_threads) | |
87ce2a04 DE |
3304 | debug_printf ("No longer need exit-jump-pad bkpt; removing it." |
3305 | "stopping all threads momentarily.\n"); | |
fa593d66 PA |
3306 | |
3307 | /* Other running threads could hit this breakpoint. | |
3308 | We don't handle moribund locations like GDB does, | |
3309 | instead we always pause all threads when removing | |
3310 | breakpoints, so that any step-over or | |
3311 | decr_pc_after_break adjustment is always taken | |
3312 | care of while the breakpoint is still | |
3313 | inserted. */ | |
3314 | stop_all_lwps (1, event_child); | |
fa593d66 PA |
3315 | |
3316 | delete_breakpoint (event_child->exit_jump_pad_bkpt); | |
3317 | event_child->exit_jump_pad_bkpt = NULL; | |
3318 | ||
3319 | unstop_all_lwps (1, event_child); | |
3320 | ||
3321 | gdb_assert (event_child->suspended >= 0); | |
3322 | } | |
3323 | } | |
3324 | ||
229d26fc SM |
3325 | if (event_child->collecting_fast_tracepoint |
3326 | == fast_tpoint_collect_result::not_collecting) | |
fa593d66 PA |
3327 | { |
3328 | if (debug_threads) | |
87ce2a04 DE |
3329 | debug_printf ("fast tracepoint finished " |
3330 | "collecting successfully.\n"); | |
fa593d66 PA |
3331 | |
3332 | /* We may have a deferred signal to report. */ | |
3333 | if (dequeue_one_deferred_signal (event_child, &w)) | |
3334 | { | |
3335 | if (debug_threads) | |
87ce2a04 | 3336 | debug_printf ("dequeued one signal.\n"); |
fa593d66 | 3337 | } |
3c11dd79 | 3338 | else |
fa593d66 | 3339 | { |
3c11dd79 | 3340 | if (debug_threads) |
87ce2a04 | 3341 | debug_printf ("no deferred signals.\n"); |
fa593d66 PA |
3342 | |
3343 | if (stabilizing_threads) | |
3344 | { | |
3345 | ourstatus->kind = TARGET_WAITKIND_STOPPED; | |
a493e3e2 | 3346 | ourstatus->value.sig = GDB_SIGNAL_0; |
87ce2a04 DE |
3347 | |
3348 | if (debug_threads) | |
3349 | { | |
d16f3f6c | 3350 | debug_printf ("wait_1 ret = %s, stopped " |
87ce2a04 | 3351 | "while stabilizing threads\n", |
0bfdf32f | 3352 | target_pid_to_str (ptid_of (current_thread))); |
87ce2a04 DE |
3353 | debug_exit (); |
3354 | } | |
3355 | ||
0bfdf32f | 3356 | return ptid_of (current_thread); |
fa593d66 PA |
3357 | } |
3358 | } | |
3359 | } | |
6bf5e0ba PA |
3360 | } |
3361 | ||
e471f25b PA |
3362 | /* Check whether GDB would be interested in this event. */ |
3363 | ||
82075af2 JS |
3364 | /* Check if GDB is interested in this syscall. */ |
3365 | if (WIFSTOPPED (w) | |
3366 | && WSTOPSIG (w) == SYSCALL_SIGTRAP | |
3367 | && !gdb_catch_this_syscall_p (event_child)) | |
3368 | { | |
3369 | if (debug_threads) | |
3370 | { | |
3371 | debug_printf ("Ignored syscall for LWP %ld.\n", | |
3372 | lwpid_of (current_thread)); | |
3373 | } | |
3374 | ||
3375 | linux_resume_one_lwp (event_child, event_child->stepping, | |
3376 | 0, NULL); | |
edeeb602 YQ |
3377 | |
3378 | if (debug_threads) | |
3379 | debug_exit (); | |
82075af2 JS |
3380 | return ignore_event (ourstatus); |
3381 | } | |
3382 | ||
e471f25b PA |
3383 | /* If GDB is not interested in this signal, don't stop other |
3384 | threads, and don't report it to GDB. Just resume the inferior | |
3385 | right away. We do this for threading-related signals as well as | |
3386 | any that GDB specifically requested we ignore. But never ignore | |
3387 | SIGSTOP if we sent it ourselves, and do not ignore signals when | |
3388 | stepping - they may require special handling to skip the signal | |
c9587f88 AT |
3389 | handler. Also never ignore signals that could be caused by a |
3390 | breakpoint. */ | |
e471f25b | 3391 | if (WIFSTOPPED (w) |
0bfdf32f | 3392 | && current_thread->last_resume_kind != resume_step |
e471f25b | 3393 | && ( |
1a981360 | 3394 | #if defined (USE_THREAD_DB) && !defined (__ANDROID__) |
fe978cb0 | 3395 | (current_process ()->priv->thread_db != NULL |
e471f25b PA |
3396 | && (WSTOPSIG (w) == __SIGRTMIN |
3397 | || WSTOPSIG (w) == __SIGRTMIN + 1)) | |
3398 | || | |
3399 | #endif | |
c12a5089 | 3400 | (cs.pass_signals[gdb_signal_from_host (WSTOPSIG (w))] |
e471f25b | 3401 | && !(WSTOPSIG (w) == SIGSTOP |
c9587f88 AT |
3402 | && current_thread->last_resume_kind == resume_stop) |
3403 | && !linux_wstatus_maybe_breakpoint (w)))) | |
e471f25b PA |
3404 | { |
3405 | siginfo_t info, *info_p; | |
3406 | ||
3407 | if (debug_threads) | |
87ce2a04 | 3408 | debug_printf ("Ignored signal %d for LWP %ld.\n", |
0bfdf32f | 3409 | WSTOPSIG (w), lwpid_of (current_thread)); |
e471f25b | 3410 | |
0bfdf32f | 3411 | if (ptrace (PTRACE_GETSIGINFO, lwpid_of (current_thread), |
b8e1b30e | 3412 | (PTRACE_TYPE_ARG3) 0, &info) == 0) |
e471f25b PA |
3413 | info_p = &info; |
3414 | else | |
3415 | info_p = NULL; | |
863d01bd PA |
3416 | |
3417 | if (step_over_finished) | |
3418 | { | |
3419 | /* We cancelled this thread's step-over above. We still | |
3420 | need to unsuspend all other LWPs, and set them back | |
3421 | running again while the signal handler runs. */ | |
3422 | unsuspend_all_lwps (event_child); | |
3423 | ||
3424 | /* Enqueue the pending signal info so that proceed_all_lwps | |
3425 | doesn't lose it. */ | |
3426 | enqueue_pending_signal (event_child, WSTOPSIG (w), info_p); | |
3427 | ||
3428 | proceed_all_lwps (); | |
3429 | } | |
3430 | else | |
3431 | { | |
3432 | linux_resume_one_lwp (event_child, event_child->stepping, | |
3433 | WSTOPSIG (w), info_p); | |
3434 | } | |
edeeb602 YQ |
3435 | |
3436 | if (debug_threads) | |
3437 | debug_exit (); | |
3438 | ||
582511be | 3439 | return ignore_event (ourstatus); |
e471f25b PA |
3440 | } |
3441 | ||
c2d6af84 PA |
3442 | /* Note that all addresses are always "out of the step range" when |
3443 | there's no range to begin with. */ | |
3444 | in_step_range = lwp_in_step_range (event_child); | |
3445 | ||
3446 | /* If GDB wanted this thread to single step, and the thread is out | |
3447 | of the step range, we always want to report the SIGTRAP, and let | |
3448 | GDB handle it. Watchpoints should always be reported. So should | |
3449 | signals we can't explain. A SIGTRAP we can't explain could be a | |
3450 | GDB breakpoint --- we may or not support Z0 breakpoints. If we | |
3451 | do, we're be able to handle GDB breakpoints on top of internal | |
3452 | breakpoints, by handling the internal breakpoint and still | |
3453 | reporting the event to GDB. If we don't, we're out of luck, GDB | |
863d01bd PA |
3454 | won't see the breakpoint hit. If we see a single-step event but |
3455 | the thread should be continuing, don't pass the trap to gdb. | |
3456 | That indicates that we had previously finished a single-step but | |
3457 | left the single-step pending -- see | |
3458 | complete_ongoing_step_over. */ | |
6bf5e0ba | 3459 | report_to_gdb = (!maybe_internal_trap |
0bfdf32f | 3460 | || (current_thread->last_resume_kind == resume_step |
c2d6af84 | 3461 | && !in_step_range) |
15c66dd6 | 3462 | || event_child->stop_reason == TARGET_STOPPED_BY_WATCHPOINT |
863d01bd PA |
3463 | || (!in_step_range |
3464 | && !bp_explains_trap | |
3465 | && !trace_event | |
3466 | && !step_over_finished | |
3467 | && !(current_thread->last_resume_kind == resume_continue | |
3468 | && event_child->stop_reason == TARGET_STOPPED_BY_SINGLE_STEP)) | |
9f3a5c85 | 3469 | || (gdb_breakpoint_here (event_child->stop_pc) |
d3ce09f5 | 3470 | && gdb_condition_true_at_breakpoint (event_child->stop_pc) |
de0d863e | 3471 | && gdb_no_commands_at_breakpoint (event_child->stop_pc)) |
00db26fa | 3472 | || event_child->waitstatus.kind != TARGET_WAITKIND_IGNORE); |
d3ce09f5 SS |
3473 | |
3474 | run_breakpoint_commands (event_child->stop_pc); | |
6bf5e0ba PA |
3475 | |
3476 | /* We found no reason GDB would want us to stop. We either hit one | |
3477 | of our own breakpoints, or finished an internal step GDB | |
3478 | shouldn't know about. */ | |
3479 | if (!report_to_gdb) | |
3480 | { | |
3481 | if (debug_threads) | |
3482 | { | |
3483 | if (bp_explains_trap) | |
87ce2a04 | 3484 | debug_printf ("Hit a gdbserver breakpoint.\n"); |
6bf5e0ba | 3485 | if (step_over_finished) |
87ce2a04 | 3486 | debug_printf ("Step-over finished.\n"); |
219f2f23 | 3487 | if (trace_event) |
87ce2a04 | 3488 | debug_printf ("Tracepoint event.\n"); |
c2d6af84 | 3489 | if (lwp_in_step_range (event_child)) |
87ce2a04 DE |
3490 | debug_printf ("Range stepping pc 0x%s [0x%s, 0x%s).\n", |
3491 | paddress (event_child->stop_pc), | |
3492 | paddress (event_child->step_range_start), | |
3493 | paddress (event_child->step_range_end)); | |
6bf5e0ba PA |
3494 | } |
3495 | ||
3496 | /* We're not reporting this breakpoint to GDB, so apply the | |
3497 | decr_pc_after_break adjustment to the inferior's regcache | |
3498 | ourselves. */ | |
3499 | ||
3500 | if (the_low_target.set_pc != NULL) | |
3501 | { | |
3502 | struct regcache *regcache | |
0bfdf32f | 3503 | = get_thread_regcache (current_thread, 1); |
6bf5e0ba PA |
3504 | (*the_low_target.set_pc) (regcache, event_child->stop_pc); |
3505 | } | |
3506 | ||
7984d532 | 3507 | if (step_over_finished) |
e3652c84 YQ |
3508 | { |
3509 | /* If we have finished stepping over a breakpoint, we've | |
3510 | stopped and suspended all LWPs momentarily except the | |
3511 | stepping one. This is where we resume them all again. | |
3512 | We're going to keep waiting, so use proceed, which | |
3513 | handles stepping over the next breakpoint. */ | |
3514 | unsuspend_all_lwps (event_child); | |
3515 | } | |
3516 | else | |
3517 | { | |
3518 | /* Remove the single-step breakpoints if any. Note that | |
3519 | there isn't single-step breakpoint if we finished stepping | |
3520 | over. */ | |
3521 | if (can_software_single_step () | |
3522 | && has_single_step_breakpoints (current_thread)) | |
3523 | { | |
3524 | stop_all_lwps (0, event_child); | |
3525 | delete_single_step_breakpoints (current_thread); | |
3526 | unstop_all_lwps (0, event_child); | |
3527 | } | |
3528 | } | |
7984d532 | 3529 | |
e3652c84 YQ |
3530 | if (debug_threads) |
3531 | debug_printf ("proceeding all threads.\n"); | |
6bf5e0ba | 3532 | proceed_all_lwps (); |
edeeb602 YQ |
3533 | |
3534 | if (debug_threads) | |
3535 | debug_exit (); | |
3536 | ||
582511be | 3537 | return ignore_event (ourstatus); |
6bf5e0ba PA |
3538 | } |
3539 | ||
3540 | if (debug_threads) | |
3541 | { | |
00db26fa | 3542 | if (event_child->waitstatus.kind != TARGET_WAITKIND_IGNORE) |
ad071a30 | 3543 | { |
23fdd69e SM |
3544 | std::string str |
3545 | = target_waitstatus_to_string (&event_child->waitstatus); | |
ad071a30 | 3546 | |
ad071a30 | 3547 | debug_printf ("LWP %ld: extended event with waitstatus %s\n", |
23fdd69e | 3548 | lwpid_of (get_lwp_thread (event_child)), str.c_str ()); |
ad071a30 | 3549 | } |
0bfdf32f | 3550 | if (current_thread->last_resume_kind == resume_step) |
c2d6af84 PA |
3551 | { |
3552 | if (event_child->step_range_start == event_child->step_range_end) | |
87ce2a04 | 3553 | debug_printf ("GDB wanted to single-step, reporting event.\n"); |
c2d6af84 | 3554 | else if (!lwp_in_step_range (event_child)) |
87ce2a04 | 3555 | debug_printf ("Out of step range, reporting event.\n"); |
c2d6af84 | 3556 | } |
15c66dd6 | 3557 | if (event_child->stop_reason == TARGET_STOPPED_BY_WATCHPOINT) |
87ce2a04 | 3558 | debug_printf ("Stopped by watchpoint.\n"); |
582511be | 3559 | else if (gdb_breakpoint_here (event_child->stop_pc)) |
87ce2a04 | 3560 | debug_printf ("Stopped by GDB breakpoint.\n"); |
6bf5e0ba | 3561 | if (debug_threads) |
87ce2a04 | 3562 | debug_printf ("Hit a non-gdbserver trap event.\n"); |
6bf5e0ba PA |
3563 | } |
3564 | ||
3565 | /* Alright, we're going to report a stop. */ | |
3566 | ||
3b9a79ef | 3567 | /* Remove single-step breakpoints. */ |
8901d193 YQ |
3568 | if (can_software_single_step ()) |
3569 | { | |
3b9a79ef | 3570 | /* Remove single-step breakpoints or not. It it is true, stop all |
8901d193 YQ |
3571 | lwps, so that other threads won't hit the breakpoint in the |
3572 | staled memory. */ | |
3b9a79ef | 3573 | int remove_single_step_breakpoints_p = 0; |
8901d193 YQ |
3574 | |
3575 | if (non_stop) | |
3576 | { | |
3b9a79ef YQ |
3577 | remove_single_step_breakpoints_p |
3578 | = has_single_step_breakpoints (current_thread); | |
8901d193 YQ |
3579 | } |
3580 | else | |
3581 | { | |
3582 | /* In all-stop, a stop reply cancels all previous resume | |
3b9a79ef | 3583 | requests. Delete all single-step breakpoints. */ |
8901d193 | 3584 | |
9c80ecd6 SM |
3585 | find_thread ([&] (thread_info *thread) { |
3586 | if (has_single_step_breakpoints (thread)) | |
3587 | { | |
3588 | remove_single_step_breakpoints_p = 1; | |
3589 | return true; | |
3590 | } | |
8901d193 | 3591 | |
9c80ecd6 SM |
3592 | return false; |
3593 | }); | |
8901d193 YQ |
3594 | } |
3595 | ||
3b9a79ef | 3596 | if (remove_single_step_breakpoints_p) |
8901d193 | 3597 | { |
3b9a79ef | 3598 | /* If we remove single-step breakpoints from memory, stop all lwps, |
8901d193 YQ |
3599 | so that other threads won't hit the breakpoint in the staled |
3600 | memory. */ | |
3601 | stop_all_lwps (0, event_child); | |
3602 | ||
3603 | if (non_stop) | |
3604 | { | |
3b9a79ef YQ |
3605 | gdb_assert (has_single_step_breakpoints (current_thread)); |
3606 | delete_single_step_breakpoints (current_thread); | |
8901d193 YQ |
3607 | } |
3608 | else | |
3609 | { | |
9c80ecd6 SM |
3610 | for_each_thread ([] (thread_info *thread){ |
3611 | if (has_single_step_breakpoints (thread)) | |
3612 | delete_single_step_breakpoints (thread); | |
3613 | }); | |
8901d193 YQ |
3614 | } |
3615 | ||
3616 | unstop_all_lwps (0, event_child); | |
3617 | } | |
3618 | } | |
3619 | ||
582511be | 3620 | if (!stabilizing_threads) |
6bf5e0ba PA |
3621 | { |
3622 | /* In all-stop, stop all threads. */ | |
582511be PA |
3623 | if (!non_stop) |
3624 | stop_all_lwps (0, NULL); | |
6bf5e0ba | 3625 | |
c03e6ccc | 3626 | if (step_over_finished) |
582511be PA |
3627 | { |
3628 | if (!non_stop) | |
3629 | { | |
3630 | /* If we were doing a step-over, all other threads but | |
3631 | the stepping one had been paused in start_step_over, | |
3632 | with their suspend counts incremented. We don't want | |
3633 | to do a full unstop/unpause, because we're in | |
3634 | all-stop mode (so we want threads stopped), but we | |
3635 | still need to unsuspend the other threads, to | |
3636 | decrement their `suspended' count back. */ | |
3637 | unsuspend_all_lwps (event_child); | |
3638 | } | |
3639 | else | |
3640 | { | |
3641 | /* If we just finished a step-over, then all threads had | |
3642 | been momentarily paused. In all-stop, that's fine, | |
3643 | we want threads stopped by now anyway. In non-stop, | |
3644 | we need to re-resume threads that GDB wanted to be | |
3645 | running. */ | |
3646 | unstop_all_lwps (1, event_child); | |
3647 | } | |
3648 | } | |
c03e6ccc | 3649 | |
3aa5cfa0 AT |
3650 | /* If we're not waiting for a specific LWP, choose an event LWP |
3651 | from among those that have had events. Giving equal priority | |
3652 | to all LWPs that have had events helps prevent | |
3653 | starvation. */ | |
d7e15655 | 3654 | if (ptid == minus_one_ptid) |
3aa5cfa0 AT |
3655 | { |
3656 | event_child->status_pending_p = 1; | |
3657 | event_child->status_pending = w; | |
3658 | ||
3659 | select_event_lwp (&event_child); | |
3660 | ||
3661 | /* current_thread and event_child must stay in sync. */ | |
3662 | current_thread = get_lwp_thread (event_child); | |
3663 | ||
3664 | event_child->status_pending_p = 0; | |
3665 | w = event_child->status_pending; | |
3666 | } | |
3667 | ||
3668 | ||
fa593d66 | 3669 | /* Stabilize threads (move out of jump pads). */ |
582511be | 3670 | if (!non_stop) |
5c9eb2f2 | 3671 | target_stabilize_threads (); |
6bf5e0ba PA |
3672 | } |
3673 | else | |
3674 | { | |
3675 | /* If we just finished a step-over, then all threads had been | |
3676 | momentarily paused. In all-stop, that's fine, we want | |
3677 | threads stopped by now anyway. In non-stop, we need to | |
3678 | re-resume threads that GDB wanted to be running. */ | |
3679 | if (step_over_finished) | |
7984d532 | 3680 | unstop_all_lwps (1, event_child); |
6bf5e0ba PA |
3681 | } |
3682 | ||
00db26fa | 3683 | if (event_child->waitstatus.kind != TARGET_WAITKIND_IGNORE) |
de0d863e | 3684 | { |
00db26fa PA |
3685 | /* If the reported event is an exit, fork, vfork or exec, let |
3686 | GDB know. */ | |
5a04c4cf PA |
3687 | |
3688 | /* Break the unreported fork relationship chain. */ | |
3689 | if (event_child->waitstatus.kind == TARGET_WAITKIND_FORKED | |
3690 | || event_child->waitstatus.kind == TARGET_WAITKIND_VFORKED) | |
3691 | { | |
3692 | event_child->fork_relative->fork_relative = NULL; | |
3693 | event_child->fork_relative = NULL; | |
3694 | } | |
3695 | ||
00db26fa | 3696 | *ourstatus = event_child->waitstatus; |
de0d863e DB |
3697 | /* Clear the event lwp's waitstatus since we handled it already. */ |
3698 | event_child->waitstatus.kind = TARGET_WAITKIND_IGNORE; | |
3699 | } | |
3700 | else | |
3701 | ourstatus->kind = TARGET_WAITKIND_STOPPED; | |
5b1c542e | 3702 | |
582511be | 3703 | /* Now that we've selected our final event LWP, un-adjust its PC if |
3e572f71 PA |
3704 | it was a software breakpoint, and the client doesn't know we can |
3705 | adjust the breakpoint ourselves. */ | |
3706 | if (event_child->stop_reason == TARGET_STOPPED_BY_SW_BREAKPOINT | |
c12a5089 | 3707 | && !cs.swbreak_feature) |
582511be PA |
3708 | { |
3709 | int decr_pc = the_low_target.decr_pc_after_break; | |
3710 | ||
3711 | if (decr_pc != 0) | |
3712 | { | |
3713 | struct regcache *regcache | |
3714 | = get_thread_regcache (current_thread, 1); | |
3715 | (*the_low_target.set_pc) (regcache, event_child->stop_pc + decr_pc); | |
3716 | } | |
3717 | } | |
3718 | ||
82075af2 JS |
3719 | if (WSTOPSIG (w) == SYSCALL_SIGTRAP) |
3720 | { | |
82075af2 | 3721 | get_syscall_trapinfo (event_child, |
4cc32bec | 3722 | &ourstatus->value.syscall_number); |
82075af2 JS |
3723 | ourstatus->kind = event_child->syscall_state; |
3724 | } | |
3725 | else if (current_thread->last_resume_kind == resume_stop | |
3726 | && WSTOPSIG (w) == SIGSTOP) | |
bd99dc85 PA |
3727 | { |
3728 | /* A thread that has been requested to stop by GDB with vCont;t, | |
3729 | and it stopped cleanly, so report as SIG0. The use of | |
3730 | SIGSTOP is an implementation detail. */ | |
a493e3e2 | 3731 | ourstatus->value.sig = GDB_SIGNAL_0; |
bd99dc85 | 3732 | } |
0bfdf32f | 3733 | else if (current_thread->last_resume_kind == resume_stop |
8336d594 | 3734 | && WSTOPSIG (w) != SIGSTOP) |
bd99dc85 PA |
3735 | { |
3736 | /* A thread that has been requested to stop by GDB with vCont;t, | |
d50171e4 | 3737 | but, it stopped for other reasons. */ |
2ea28649 | 3738 | ourstatus->value.sig = gdb_signal_from_host (WSTOPSIG (w)); |
bd99dc85 | 3739 | } |
de0d863e | 3740 | else if (ourstatus->kind == TARGET_WAITKIND_STOPPED) |
bd99dc85 | 3741 | { |
2ea28649 | 3742 | ourstatus->value.sig = gdb_signal_from_host (WSTOPSIG (w)); |
bd99dc85 PA |
3743 | } |
3744 | ||
d7e15655 | 3745 | gdb_assert (step_over_bkpt == null_ptid); |
d50171e4 | 3746 | |
bd99dc85 | 3747 | if (debug_threads) |
87ce2a04 | 3748 | { |
d16f3f6c | 3749 | debug_printf ("wait_1 ret = %s, %d, %d\n", |
0bfdf32f | 3750 | target_pid_to_str (ptid_of (current_thread)), |
87ce2a04 DE |
3751 | ourstatus->kind, ourstatus->value.sig); |
3752 | debug_exit (); | |
3753 | } | |
bd99dc85 | 3754 | |
65706a29 PA |
3755 | if (ourstatus->kind == TARGET_WAITKIND_EXITED) |
3756 | return filter_exit_event (event_child, ourstatus); | |
3757 | ||
0bfdf32f | 3758 | return ptid_of (current_thread); |
bd99dc85 PA |
3759 | } |
3760 | ||
3761 | /* Get rid of any pending event in the pipe. */ | |
3762 | static void | |
3763 | async_file_flush (void) | |
3764 | { | |
3765 | int ret; | |
3766 | char buf; | |
3767 | ||
3768 | do | |
3769 | ret = read (linux_event_pipe[0], &buf, 1); | |
3770 | while (ret >= 0 || (ret == -1 && errno == EINTR)); | |
3771 | } | |
3772 | ||
3773 | /* Put something in the pipe, so the event loop wakes up. */ | |
3774 | static void | |
3775 | async_file_mark (void) | |
3776 | { | |
3777 | int ret; | |
3778 | ||
3779 | async_file_flush (); | |
3780 | ||
3781 | do | |
3782 | ret = write (linux_event_pipe[1], "+", 1); | |
3783 | while (ret == 0 || (ret == -1 && errno == EINTR)); | |
3784 | ||
3785 | /* Ignore EAGAIN. If the pipe is full, the event loop will already | |
3786 | be awakened anyway. */ | |
3787 | } | |
3788 | ||
6532e7e3 TBA |
3789 | ptid_t |
3790 | linux_process_target::wait (ptid_t ptid, | |
3791 | target_waitstatus *ourstatus, | |
3792 | int target_options) | |
bd99dc85 | 3793 | { |
95954743 | 3794 | ptid_t event_ptid; |
bd99dc85 | 3795 | |
bd99dc85 PA |
3796 | /* Flush the async file first. */ |
3797 | if (target_is_async_p ()) | |
3798 | async_file_flush (); | |
3799 | ||
582511be PA |
3800 | do |
3801 | { | |
d16f3f6c | 3802 | event_ptid = wait_1 (ptid, ourstatus, target_options); |
582511be PA |
3803 | } |
3804 | while ((target_options & TARGET_WNOHANG) == 0 | |
d7e15655 | 3805 | && event_ptid == null_ptid |
582511be | 3806 | && ourstatus->kind == TARGET_WAITKIND_IGNORE); |
bd99dc85 PA |
3807 | |
3808 | /* If at least one stop was reported, there may be more. A single | |
3809 | SIGCHLD can signal more than one child stop. */ | |
3810 | if (target_is_async_p () | |
3811 | && (target_options & TARGET_WNOHANG) != 0 | |
d7e15655 | 3812 | && event_ptid != null_ptid) |
bd99dc85 PA |
3813 | async_file_mark (); |
3814 | ||
3815 | return event_ptid; | |
da6d8c04 DJ |
3816 | } |
3817 | ||
c5f62d5f | 3818 | /* Send a signal to an LWP. */ |
fd500816 DJ |
3819 | |
3820 | static int | |
a1928bad | 3821 | kill_lwp (unsigned long lwpid, int signo) |
fd500816 | 3822 | { |
4a6ed09b | 3823 | int ret; |
fd500816 | 3824 | |
4a6ed09b PA |
3825 | errno = 0; |
3826 | ret = syscall (__NR_tkill, lwpid, signo); | |
3827 | if (errno == ENOSYS) | |
3828 | { | |
3829 | /* If tkill fails, then we are not using nptl threads, a | |
3830 | configuration we no longer support. */ | |
3831 | perror_with_name (("tkill")); | |
3832 | } | |
3833 | return ret; | |
fd500816 DJ |
3834 | } |
3835 | ||
964e4306 PA |
3836 | void |
3837 | linux_stop_lwp (struct lwp_info *lwp) | |
3838 | { | |
3839 | send_sigstop (lwp); | |
3840 | } | |
3841 | ||
0d62e5e8 | 3842 | static void |
02fc4de7 | 3843 | send_sigstop (struct lwp_info *lwp) |
0d62e5e8 | 3844 | { |
bd99dc85 | 3845 | int pid; |
0d62e5e8 | 3846 | |
d86d4aaf | 3847 | pid = lwpid_of (get_lwp_thread (lwp)); |
bd99dc85 | 3848 | |
0d62e5e8 DJ |
3849 | /* If we already have a pending stop signal for this process, don't |
3850 | send another. */ | |
54a0b537 | 3851 | if (lwp->stop_expected) |
0d62e5e8 | 3852 | { |
ae13219e | 3853 | if (debug_threads) |
87ce2a04 | 3854 | debug_printf ("Have pending sigstop for lwp %d\n", pid); |
ae13219e | 3855 | |
0d62e5e8 DJ |
3856 | return; |
3857 | } | |
3858 | ||
3859 | if (debug_threads) | |
87ce2a04 | 3860 | debug_printf ("Sending sigstop to lwp %d\n", pid); |
0d62e5e8 | 3861 | |
d50171e4 | 3862 | lwp->stop_expected = 1; |
bd99dc85 | 3863 | kill_lwp (pid, SIGSTOP); |
0d62e5e8 DJ |
3864 | } |
3865 | ||
df3e4dbe SM |
3866 | static void |
3867 | send_sigstop (thread_info *thread, lwp_info *except) | |
02fc4de7 | 3868 | { |
d86d4aaf | 3869 | struct lwp_info *lwp = get_thread_lwp (thread); |
02fc4de7 | 3870 | |
7984d532 PA |
3871 | /* Ignore EXCEPT. */ |
3872 | if (lwp == except) | |
df3e4dbe | 3873 | return; |
7984d532 | 3874 | |
02fc4de7 | 3875 | if (lwp->stopped) |
df3e4dbe | 3876 | return; |
02fc4de7 PA |
3877 | |
3878 | send_sigstop (lwp); | |
7984d532 PA |
3879 | } |
3880 | ||
3881 | /* Increment the suspend count of an LWP, and stop it, if not stopped | |
3882 | yet. */ | |
df3e4dbe SM |
3883 | static void |
3884 | suspend_and_send_sigstop (thread_info *thread, lwp_info *except) | |
7984d532 | 3885 | { |
d86d4aaf | 3886 | struct lwp_info *lwp = get_thread_lwp (thread); |
7984d532 PA |
3887 | |
3888 | /* Ignore EXCEPT. */ | |
3889 | if (lwp == except) | |
df3e4dbe | 3890 | return; |
7984d532 | 3891 | |
863d01bd | 3892 | lwp_suspended_inc (lwp); |
7984d532 | 3893 | |
df3e4dbe | 3894 | send_sigstop (thread, except); |
02fc4de7 PA |
3895 | } |
3896 | ||
95954743 PA |
3897 | static void |
3898 | mark_lwp_dead (struct lwp_info *lwp, int wstat) | |
3899 | { | |
95954743 PA |
3900 | /* Store the exit status for later. */ |
3901 | lwp->status_pending_p = 1; | |
3902 | lwp->status_pending = wstat; | |
3903 | ||
00db26fa PA |
3904 | /* Store in waitstatus as well, as there's nothing else to process |
3905 | for this event. */ | |
3906 | if (WIFEXITED (wstat)) | |
3907 | { | |
3908 | lwp->waitstatus.kind = TARGET_WAITKIND_EXITED; | |
3909 | lwp->waitstatus.value.integer = WEXITSTATUS (wstat); | |
3910 | } | |
3911 | else if (WIFSIGNALED (wstat)) | |
3912 | { | |
3913 | lwp->waitstatus.kind = TARGET_WAITKIND_SIGNALLED; | |
3914 | lwp->waitstatus.value.sig = gdb_signal_from_host (WTERMSIG (wstat)); | |
3915 | } | |
3916 | ||
95954743 PA |
3917 | /* Prevent trying to stop it. */ |
3918 | lwp->stopped = 1; | |
3919 | ||
3920 | /* No further stops are expected from a dead lwp. */ | |
3921 | lwp->stop_expected = 0; | |
3922 | } | |
3923 | ||
00db26fa PA |
3924 | /* Return true if LWP has exited already, and has a pending exit event |
3925 | to report to GDB. */ | |
3926 | ||
3927 | static int | |
3928 | lwp_is_marked_dead (struct lwp_info *lwp) | |
3929 | { | |
3930 | return (lwp->status_pending_p | |
3931 | && (WIFEXITED (lwp->status_pending) | |
3932 | || WIFSIGNALED (lwp->status_pending))); | |
3933 | } | |
3934 | ||
d16f3f6c TBA |
3935 | void |
3936 | linux_process_target::wait_for_sigstop () | |
0d62e5e8 | 3937 | { |
0bfdf32f | 3938 | struct thread_info *saved_thread; |
95954743 | 3939 | ptid_t saved_tid; |
fa96cb38 PA |
3940 | int wstat; |
3941 | int ret; | |
0d62e5e8 | 3942 | |
0bfdf32f GB |
3943 | saved_thread = current_thread; |
3944 | if (saved_thread != NULL) | |
9c80ecd6 | 3945 | saved_tid = saved_thread->id; |
bd99dc85 | 3946 | else |
95954743 | 3947 | saved_tid = null_ptid; /* avoid bogus unused warning */ |
bd99dc85 | 3948 | |
d50171e4 | 3949 | if (debug_threads) |
fa96cb38 | 3950 | debug_printf ("wait_for_sigstop: pulling events\n"); |
d50171e4 | 3951 | |
fa96cb38 PA |
3952 | /* Passing NULL_PTID as filter indicates we want all events to be |
3953 | left pending. Eventually this returns when there are no | |
3954 | unwaited-for children left. */ | |
d16f3f6c | 3955 | ret = wait_for_event_filtered (minus_one_ptid, null_ptid, &wstat, __WALL); |
fa96cb38 | 3956 | gdb_assert (ret == -1); |
0d62e5e8 | 3957 | |
13d3d99b | 3958 | if (saved_thread == NULL || mythread_alive (saved_tid)) |
0bfdf32f | 3959 | current_thread = saved_thread; |
0d62e5e8 DJ |
3960 | else |
3961 | { | |
3962 | if (debug_threads) | |
87ce2a04 | 3963 | debug_printf ("Previously current thread died.\n"); |
0d62e5e8 | 3964 | |
f0db101d PA |
3965 | /* We can't change the current inferior behind GDB's back, |
3966 | otherwise, a subsequent command may apply to the wrong | |
3967 | process. */ | |
3968 | current_thread = NULL; | |
0d62e5e8 DJ |
3969 | } |
3970 | } | |
3971 | ||
fcb056a5 | 3972 | /* Returns true if THREAD is stopped in a jump pad, and we can't |
fa593d66 PA |
3973 | move it out, because we need to report the stop event to GDB. For |
3974 | example, if the user puts a breakpoint in the jump pad, it's | |
3975 | because she wants to debug it. */ | |
3976 | ||
fcb056a5 SM |
3977 | static bool |
3978 | stuck_in_jump_pad_callback (thread_info *thread) | |
fa593d66 | 3979 | { |
d86d4aaf | 3980 | struct lwp_info *lwp = get_thread_lwp (thread); |
fa593d66 | 3981 | |
863d01bd PA |
3982 | if (lwp->suspended != 0) |
3983 | { | |
3984 | internal_error (__FILE__, __LINE__, | |
3985 | "LWP %ld is suspended, suspended=%d\n", | |
3986 | lwpid_of (thread), lwp->suspended); | |
3987 | } | |
fa593d66 PA |
3988 | gdb_assert (lwp->stopped); |
3989 | ||
3990 | /* Allow debugging the jump pad, gdb_collect, etc.. */ | |
3991 | return (supports_fast_tracepoints () | |
58b4daa5 | 3992 | && agent_loaded_p () |
fa593d66 | 3993 | && (gdb_breakpoint_here (lwp->stop_pc) |
15c66dd6 | 3994 | || lwp->stop_reason == TARGET_STOPPED_BY_WATCHPOINT |
fa593d66 | 3995 | || thread->last_resume_kind == resume_step) |
229d26fc SM |
3996 | && (linux_fast_tracepoint_collecting (lwp, NULL) |
3997 | != fast_tpoint_collect_result::not_collecting)); | |
fa593d66 PA |
3998 | } |
3999 | ||
d16f3f6c TBA |
4000 | void |
4001 | linux_process_target::move_out_of_jump_pad (thread_info *thread) | |
fa593d66 | 4002 | { |
f0ce0d3a | 4003 | struct thread_info *saved_thread; |
d86d4aaf | 4004 | struct lwp_info *lwp = get_thread_lwp (thread); |
fa593d66 PA |
4005 | int *wstat; |
4006 | ||
863d01bd PA |
4007 | if (lwp->suspended != 0) |
4008 | { | |
4009 | internal_error (__FILE__, __LINE__, | |
4010 | "LWP %ld is suspended, suspended=%d\n", | |
4011 | lwpid_of (thread), lwp->suspended); | |
4012 | } | |
fa593d66 PA |
4013 | gdb_assert (lwp->stopped); |
4014 | ||
f0ce0d3a PA |
4015 | /* For gdb_breakpoint_here. */ |
4016 | saved_thread = current_thread; | |
4017 | current_thread = thread; | |
4018 | ||
fa593d66 PA |
4019 | wstat = lwp->status_pending_p ? &lwp->status_pending : NULL; |
4020 | ||
4021 | /* Allow debugging the jump pad, gdb_collect, etc. */ | |
4022 | if (!gdb_breakpoint_here (lwp->stop_pc) | |
15c66dd6 | 4023 | && lwp->stop_reason != TARGET_STOPPED_BY_WATCHPOINT |
fa593d66 PA |
4024 | && thread->last_resume_kind != resume_step |
4025 | && maybe_move_out_of_jump_pad (lwp, wstat)) | |
4026 | { | |
4027 | if (debug_threads) | |
87ce2a04 | 4028 | debug_printf ("LWP %ld needs stabilizing (in jump pad)\n", |
d86d4aaf | 4029 | lwpid_of (thread)); |
fa593d66 PA |
4030 | |
4031 | if (wstat) | |
4032 | { | |
4033 | lwp->status_pending_p = 0; | |
4034 | enqueue_one_deferred_signal (lwp, wstat); | |
4035 | ||
4036 | if (debug_threads) | |
87ce2a04 DE |
4037 | debug_printf ("Signal %d for LWP %ld deferred " |
4038 | "(in jump pad)\n", | |
d86d4aaf | 4039 | WSTOPSIG (*wstat), lwpid_of (thread)); |
fa593d66 PA |
4040 | } |
4041 | ||
4042 | linux_resume_one_lwp (lwp, 0, 0, NULL); | |
4043 | } | |
4044 | else | |
863d01bd | 4045 | lwp_suspended_inc (lwp); |
f0ce0d3a PA |
4046 | |
4047 | current_thread = saved_thread; | |
fa593d66 PA |
4048 | } |
4049 | ||
5a6b0a41 SM |
4050 | static bool |
4051 | lwp_running (thread_info *thread) | |
fa593d66 | 4052 | { |
d86d4aaf | 4053 | struct lwp_info *lwp = get_thread_lwp (thread); |
fa593d66 | 4054 | |
00db26fa | 4055 | if (lwp_is_marked_dead (lwp)) |
5a6b0a41 SM |
4056 | return false; |
4057 | ||
4058 | return !lwp->stopped; | |
fa593d66 PA |
4059 | } |
4060 | ||
d16f3f6c TBA |
4061 | void |
4062 | linux_process_target::stop_all_lwps (int suspend, lwp_info *except) | |
0d62e5e8 | 4063 | { |
bde24c0a PA |
4064 | /* Should not be called recursively. */ |
4065 | gdb_assert (stopping_threads == NOT_STOPPING_THREADS); | |
4066 | ||
87ce2a04 DE |
4067 | if (debug_threads) |
4068 | { | |
4069 | debug_enter (); | |
4070 | debug_printf ("stop_all_lwps (%s, except=%s)\n", | |
4071 | suspend ? "stop-and-suspend" : "stop", | |
4072 | except != NULL | |
d86d4aaf | 4073 | ? target_pid_to_str (ptid_of (get_lwp_thread (except))) |
87ce2a04 DE |
4074 | : "none"); |
4075 | } | |
4076 | ||
bde24c0a PA |
4077 | stopping_threads = (suspend |
4078 | ? STOPPING_AND_SUSPENDING_THREADS | |
4079 | : STOPPING_THREADS); | |
7984d532 PA |
4080 | |
4081 | if (suspend) | |
df3e4dbe SM |
4082 | for_each_thread ([&] (thread_info *thread) |
4083 | { | |
4084 | suspend_and_send_sigstop (thread, except); | |
4085 | }); | |
7984d532 | 4086 | else |
df3e4dbe SM |
4087 | for_each_thread ([&] (thread_info *thread) |
4088 | { | |
4089 | send_sigstop (thread, except); | |
4090 | }); | |
4091 | ||
fa96cb38 | 4092 | wait_for_sigstop (); |
bde24c0a | 4093 | stopping_threads = NOT_STOPPING_THREADS; |
87ce2a04 DE |
4094 | |
4095 | if (debug_threads) | |
4096 | { | |
4097 | debug_printf ("stop_all_lwps done, setting stopping_threads " | |
4098 | "back to !stopping\n"); | |
4099 | debug_exit (); | |
4100 | } | |
0d62e5e8 DJ |
4101 | } |
4102 | ||
863d01bd PA |
4103 | /* Enqueue one signal in the chain of signals which need to be |
4104 | delivered to this process on next resume. */ | |
4105 | ||
4106 | static void | |
4107 | enqueue_pending_signal (struct lwp_info *lwp, int signal, siginfo_t *info) | |
4108 | { | |
8d749320 | 4109 | struct pending_signals *p_sig = XNEW (struct pending_signals); |
863d01bd | 4110 | |
863d01bd PA |
4111 | p_sig->prev = lwp->pending_signals; |
4112 | p_sig->signal = signal; | |
4113 | if (info == NULL) | |
4114 | memset (&p_sig->info, 0, sizeof (siginfo_t)); | |
4115 | else | |
4116 | memcpy (&p_sig->info, info, sizeof (siginfo_t)); | |
4117 | lwp->pending_signals = p_sig; | |
4118 | } | |
4119 | ||
fa5308bd AT |
4120 | /* Install breakpoints for software single stepping. */ |
4121 | ||
4122 | static void | |
4123 | install_software_single_step_breakpoints (struct lwp_info *lwp) | |
4124 | { | |
984a2c04 YQ |
4125 | struct thread_info *thread = get_lwp_thread (lwp); |
4126 | struct regcache *regcache = get_thread_regcache (thread, 1); | |
8ce47547 TT |
4127 | |
4128 | scoped_restore save_current_thread = make_scoped_restore (¤t_thread); | |
984a2c04 | 4129 | |
984a2c04 | 4130 | current_thread = thread; |
a0ff9e1a | 4131 | std::vector<CORE_ADDR> next_pcs = the_low_target.get_next_pcs (regcache); |
fa5308bd | 4132 | |
a0ff9e1a | 4133 | for (CORE_ADDR pc : next_pcs) |
3b9a79ef | 4134 | set_single_step_breakpoint (pc, current_ptid); |
fa5308bd AT |
4135 | } |
4136 | ||
7fe5e27e AT |
4137 | /* Single step via hardware or software single step. |
4138 | Return 1 if hardware single stepping, 0 if software single stepping | |
4139 | or can't single step. */ | |
4140 | ||
4141 | static int | |
4142 | single_step (struct lwp_info* lwp) | |
4143 | { | |
4144 | int step = 0; | |
4145 | ||
4146 | if (can_hardware_single_step ()) | |
4147 | { | |
4148 | step = 1; | |
4149 | } | |
4150 | else if (can_software_single_step ()) | |
4151 | { | |
4152 | install_software_single_step_breakpoints (lwp); | |
4153 | step = 0; | |
4154 | } | |
4155 | else | |
4156 | { | |
4157 | if (debug_threads) | |
4158 | debug_printf ("stepping is not implemented on this target"); | |
4159 | } | |
4160 | ||
4161 | return step; | |
4162 | } | |
4163 | ||
35ac8b3e | 4164 | /* The signal can be delivered to the inferior if we are not trying to |
5b061e98 YQ |
4165 | finish a fast tracepoint collect. Since signal can be delivered in |
4166 | the step-over, the program may go to signal handler and trap again | |
4167 | after return from the signal handler. We can live with the spurious | |
4168 | double traps. */ | |
35ac8b3e YQ |
4169 | |
4170 | static int | |
4171 | lwp_signal_can_be_delivered (struct lwp_info *lwp) | |
4172 | { | |
229d26fc SM |
4173 | return (lwp->collecting_fast_tracepoint |
4174 | == fast_tpoint_collect_result::not_collecting); | |
35ac8b3e YQ |
4175 | } |
4176 | ||
23f238d3 PA |
4177 | /* Resume execution of LWP. If STEP is nonzero, single-step it. If |
4178 | SIGNAL is nonzero, give it that signal. */ | |
da6d8c04 | 4179 | |
ce3a066d | 4180 | static void |
23f238d3 PA |
4181 | linux_resume_one_lwp_throw (struct lwp_info *lwp, |
4182 | int step, int signal, siginfo_t *info) | |
da6d8c04 | 4183 | { |
d86d4aaf | 4184 | struct thread_info *thread = get_lwp_thread (lwp); |
0bfdf32f | 4185 | struct thread_info *saved_thread; |
82075af2 | 4186 | int ptrace_request; |
c06cbd92 YQ |
4187 | struct process_info *proc = get_thread_process (thread); |
4188 | ||
4189 | /* Note that target description may not be initialised | |
4190 | (proc->tdesc == NULL) at this point because the program hasn't | |
4191 | stopped at the first instruction yet. It means GDBserver skips | |
4192 | the extra traps from the wrapper program (see option --wrapper). | |
4193 | Code in this function that requires register access should be | |
4194 | guarded by proc->tdesc == NULL or something else. */ | |
0d62e5e8 | 4195 | |
54a0b537 | 4196 | if (lwp->stopped == 0) |
0d62e5e8 DJ |
4197 | return; |
4198 | ||
65706a29 PA |
4199 | gdb_assert (lwp->waitstatus.kind == TARGET_WAITKIND_IGNORE); |
4200 | ||
229d26fc SM |
4201 | fast_tpoint_collect_result fast_tp_collecting |
4202 | = lwp->collecting_fast_tracepoint; | |
fa593d66 | 4203 | |
229d26fc SM |
4204 | gdb_assert (!stabilizing_threads |
4205 | || (fast_tp_collecting | |
4206 | != fast_tpoint_collect_result::not_collecting)); | |
fa593d66 | 4207 | |
219f2f23 PA |
4208 | /* Cancel actions that rely on GDB not changing the PC (e.g., the |
4209 | user used the "jump" command, or "set $pc = foo"). */ | |
c06cbd92 | 4210 | if (thread->while_stepping != NULL && lwp->stop_pc != get_pc (lwp)) |
219f2f23 PA |
4211 | { |
4212 | /* Collecting 'while-stepping' actions doesn't make sense | |
4213 | anymore. */ | |
d86d4aaf | 4214 | release_while_stepping_state_list (thread); |
219f2f23 PA |
4215 | } |
4216 | ||
0d62e5e8 | 4217 | /* If we have pending signals or status, and a new signal, enqueue the |
35ac8b3e YQ |
4218 | signal. Also enqueue the signal if it can't be delivered to the |
4219 | inferior right now. */ | |
0d62e5e8 | 4220 | if (signal != 0 |
fa593d66 PA |
4221 | && (lwp->status_pending_p |
4222 | || lwp->pending_signals != NULL | |
35ac8b3e | 4223 | || !lwp_signal_can_be_delivered (lwp))) |
94610ec4 YQ |
4224 | { |
4225 | enqueue_pending_signal (lwp, signal, info); | |
4226 | ||
4227 | /* Postpone any pending signal. It was enqueued above. */ | |
4228 | signal = 0; | |
4229 | } | |
0d62e5e8 | 4230 | |
d50171e4 PA |
4231 | if (lwp->status_pending_p) |
4232 | { | |
4233 | if (debug_threads) | |
94610ec4 | 4234 | debug_printf ("Not resuming lwp %ld (%s, stop %s);" |
87ce2a04 | 4235 | " has pending status\n", |
94610ec4 | 4236 | lwpid_of (thread), step ? "step" : "continue", |
87ce2a04 | 4237 | lwp->stop_expected ? "expected" : "not expected"); |
d50171e4 PA |
4238 | return; |
4239 | } | |
0d62e5e8 | 4240 | |
0bfdf32f GB |
4241 | saved_thread = current_thread; |
4242 | current_thread = thread; | |
0d62e5e8 | 4243 | |
0d62e5e8 DJ |
4244 | /* This bit needs some thinking about. If we get a signal that |
4245 | we must report while a single-step reinsert is still pending, | |
4246 | we often end up resuming the thread. It might be better to | |
4247 | (ew) allow a stack of pending events; then we could be sure that | |
4248 | the reinsert happened right away and not lose any signals. | |
4249 | ||
4250 | Making this stack would also shrink the window in which breakpoints are | |
54a0b537 | 4251 | uninserted (see comment in linux_wait_for_lwp) but not enough for |
0d62e5e8 DJ |
4252 | complete correctness, so it won't solve that problem. It may be |
4253 | worthwhile just to solve this one, however. */ | |
54a0b537 | 4254 | if (lwp->bp_reinsert != 0) |
0d62e5e8 DJ |
4255 | { |
4256 | if (debug_threads) | |
87ce2a04 DE |
4257 | debug_printf (" pending reinsert at 0x%s\n", |
4258 | paddress (lwp->bp_reinsert)); | |
d50171e4 | 4259 | |
85e00e85 | 4260 | if (can_hardware_single_step ()) |
d50171e4 | 4261 | { |
229d26fc | 4262 | if (fast_tp_collecting == fast_tpoint_collect_result::not_collecting) |
fa593d66 PA |
4263 | { |
4264 | if (step == 0) | |
9986ba08 | 4265 | warning ("BAD - reinserting but not stepping."); |
fa593d66 | 4266 | if (lwp->suspended) |
9986ba08 PA |
4267 | warning ("BAD - reinserting and suspended(%d).", |
4268 | lwp->suspended); | |
fa593d66 | 4269 | } |
d50171e4 | 4270 | } |
f79b145d YQ |
4271 | |
4272 | step = maybe_hw_step (thread); | |
0d62e5e8 DJ |
4273 | } |
4274 | ||
229d26fc | 4275 | if (fast_tp_collecting == fast_tpoint_collect_result::before_insn) |
fa593d66 PA |
4276 | { |
4277 | if (debug_threads) | |
87ce2a04 DE |
4278 | debug_printf ("lwp %ld wants to get out of fast tracepoint jump pad" |
4279 | " (exit-jump-pad-bkpt)\n", | |
d86d4aaf | 4280 | lwpid_of (thread)); |
fa593d66 | 4281 | } |
229d26fc | 4282 | else if (fast_tp_collecting == fast_tpoint_collect_result::at_insn) |
fa593d66 PA |
4283 | { |
4284 | if (debug_threads) | |
87ce2a04 DE |
4285 | debug_printf ("lwp %ld wants to get out of fast tracepoint jump pad" |
4286 | " single-stepping\n", | |
d86d4aaf | 4287 | lwpid_of (thread)); |
fa593d66 PA |
4288 | |
4289 | if (can_hardware_single_step ()) | |
4290 | step = 1; | |
4291 | else | |
38e08fca GB |
4292 | { |
4293 | internal_error (__FILE__, __LINE__, | |
4294 | "moving out of jump pad single-stepping" | |
4295 | " not implemented on this target"); | |
4296 | } | |
fa593d66 PA |
4297 | } |
4298 | ||
219f2f23 PA |
4299 | /* If we have while-stepping actions in this thread set it stepping. |
4300 | If we have a signal to deliver, it may or may not be set to | |
4301 | SIG_IGN, we don't know. Assume so, and allow collecting | |
4302 | while-stepping into a signal handler. A possible smart thing to | |
4303 | do would be to set an internal breakpoint at the signal return | |
4304 | address, continue, and carry on catching this while-stepping | |
4305 | action only when that breakpoint is hit. A future | |
4306 | enhancement. */ | |
7fe5e27e | 4307 | if (thread->while_stepping != NULL) |
219f2f23 PA |
4308 | { |
4309 | if (debug_threads) | |
87ce2a04 | 4310 | debug_printf ("lwp %ld has a while-stepping action -> forcing step.\n", |
d86d4aaf | 4311 | lwpid_of (thread)); |
7fe5e27e AT |
4312 | |
4313 | step = single_step (lwp); | |
219f2f23 PA |
4314 | } |
4315 | ||
c06cbd92 | 4316 | if (proc->tdesc != NULL && the_low_target.get_pc != NULL) |
0d62e5e8 | 4317 | { |
0bfdf32f | 4318 | struct regcache *regcache = get_thread_regcache (current_thread, 1); |
582511be PA |
4319 | |
4320 | lwp->stop_pc = (*the_low_target.get_pc) (regcache); | |
4321 | ||
4322 | if (debug_threads) | |
4323 | { | |
4324 | debug_printf (" %s from pc 0x%lx\n", step ? "step" : "continue", | |
4325 | (long) lwp->stop_pc); | |
4326 | } | |
0d62e5e8 DJ |
4327 | } |
4328 | ||
35ac8b3e YQ |
4329 | /* If we have pending signals, consume one if it can be delivered to |
4330 | the inferior. */ | |
4331 | if (lwp->pending_signals != NULL && lwp_signal_can_be_delivered (lwp)) | |
0d62e5e8 DJ |
4332 | { |
4333 | struct pending_signals **p_sig; | |
4334 | ||
54a0b537 | 4335 | p_sig = &lwp->pending_signals; |
0d62e5e8 DJ |
4336 | while ((*p_sig)->prev != NULL) |
4337 | p_sig = &(*p_sig)->prev; | |
4338 | ||
4339 | signal = (*p_sig)->signal; | |
32ca6d61 | 4340 | if ((*p_sig)->info.si_signo != 0) |
d86d4aaf | 4341 | ptrace (PTRACE_SETSIGINFO, lwpid_of (thread), (PTRACE_TYPE_ARG3) 0, |
56f7af9c | 4342 | &(*p_sig)->info); |
32ca6d61 | 4343 | |
0d62e5e8 DJ |
4344 | free (*p_sig); |
4345 | *p_sig = NULL; | |
4346 | } | |
4347 | ||
94610ec4 YQ |
4348 | if (debug_threads) |
4349 | debug_printf ("Resuming lwp %ld (%s, signal %d, stop %s)\n", | |
4350 | lwpid_of (thread), step ? "step" : "continue", signal, | |
4351 | lwp->stop_expected ? "expected" : "not expected"); | |
4352 | ||
aa5ca48f DE |
4353 | if (the_low_target.prepare_to_resume != NULL) |
4354 | the_low_target.prepare_to_resume (lwp); | |
4355 | ||
d86d4aaf | 4356 | regcache_invalidate_thread (thread); |
da6d8c04 | 4357 | errno = 0; |
54a0b537 | 4358 | lwp->stepping = step; |
82075af2 JS |
4359 | if (step) |
4360 | ptrace_request = PTRACE_SINGLESTEP; | |
4361 | else if (gdb_catching_syscalls_p (lwp)) | |
4362 | ptrace_request = PTRACE_SYSCALL; | |
4363 | else | |
4364 | ptrace_request = PTRACE_CONT; | |
4365 | ptrace (ptrace_request, | |
4366 | lwpid_of (thread), | |
b8e1b30e | 4367 | (PTRACE_TYPE_ARG3) 0, |
14ce3065 DE |
4368 | /* Coerce to a uintptr_t first to avoid potential gcc warning |
4369 | of coercing an 8 byte integer to a 4 byte pointer. */ | |
b8e1b30e | 4370 | (PTRACE_TYPE_ARG4) (uintptr_t) signal); |
0d62e5e8 | 4371 | |
0bfdf32f | 4372 | current_thread = saved_thread; |
da6d8c04 | 4373 | if (errno) |
23f238d3 PA |
4374 | perror_with_name ("resuming thread"); |
4375 | ||
4376 | /* Successfully resumed. Clear state that no longer makes sense, | |
4377 | and mark the LWP as running. Must not do this before resuming | |
4378 | otherwise if that fails other code will be confused. E.g., we'd | |
4379 | later try to stop the LWP and hang forever waiting for a stop | |
4380 | status. Note that we must not throw after this is cleared, | |
4381 | otherwise handle_zombie_lwp_error would get confused. */ | |
4382 | lwp->stopped = 0; | |
4383 | lwp->stop_reason = TARGET_STOPPED_BY_NO_REASON; | |
4384 | } | |
4385 | ||
4386 | /* Called when we try to resume a stopped LWP and that errors out. If | |
4387 | the LWP is no longer in ptrace-stopped state (meaning it's zombie, | |
4388 | or about to become), discard the error, clear any pending status | |
4389 | the LWP may have, and return true (we'll collect the exit status | |
4390 | soon enough). Otherwise, return false. */ | |
4391 | ||
4392 | static int | |
4393 | check_ptrace_stopped_lwp_gone (struct lwp_info *lp) | |
4394 | { | |
4395 | struct thread_info *thread = get_lwp_thread (lp); | |
4396 | ||
4397 | /* If we get an error after resuming the LWP successfully, we'd | |
4398 | confuse !T state for the LWP being gone. */ | |
4399 | gdb_assert (lp->stopped); | |
4400 | ||
4401 | /* We can't just check whether the LWP is in 'Z (Zombie)' state, | |
4402 | because even if ptrace failed with ESRCH, the tracee may be "not | |
4403 | yet fully dead", but already refusing ptrace requests. In that | |
4404 | case the tracee has 'R (Running)' state for a little bit | |
4405 | (observed in Linux 3.18). See also the note on ESRCH in the | |
4406 | ptrace(2) man page. Instead, check whether the LWP has any state | |
4407 | other than ptrace-stopped. */ | |
4408 | ||
4409 | /* Don't assume anything if /proc/PID/status can't be read. */ | |
4410 | if (linux_proc_pid_is_trace_stopped_nowarn (lwpid_of (thread)) == 0) | |
3221518c | 4411 | { |
23f238d3 PA |
4412 | lp->stop_reason = TARGET_STOPPED_BY_NO_REASON; |
4413 | lp->status_pending_p = 0; | |
4414 | return 1; | |
4415 | } | |
4416 | return 0; | |
4417 | } | |
4418 | ||
4419 | /* Like linux_resume_one_lwp_throw, but no error is thrown if the LWP | |
4420 | disappears while we try to resume it. */ | |
3221518c | 4421 | |
23f238d3 PA |
4422 | static void |
4423 | linux_resume_one_lwp (struct lwp_info *lwp, | |
4424 | int step, int signal, siginfo_t *info) | |
4425 | { | |
a70b8144 | 4426 | try |
23f238d3 PA |
4427 | { |
4428 | linux_resume_one_lwp_throw (lwp, step, signal, info); | |
4429 | } | |
230d2906 | 4430 | catch (const gdb_exception_error &ex) |
23f238d3 PA |
4431 | { |
4432 | if (!check_ptrace_stopped_lwp_gone (lwp)) | |
eedc3f4f | 4433 | throw; |
3221518c | 4434 | } |
da6d8c04 DJ |
4435 | } |
4436 | ||
5fdda392 SM |
4437 | /* This function is called once per thread via for_each_thread. |
4438 | We look up which resume request applies to THREAD and mark it with a | |
4439 | pointer to the appropriate resume request. | |
5544ad89 DJ |
4440 | |
4441 | This algorithm is O(threads * resume elements), but resume elements | |
4442 | is small (and will remain small at least until GDB supports thread | |
4443 | suspension). */ | |
ebcf782c | 4444 | |
5fdda392 SM |
4445 | static void |
4446 | linux_set_resume_request (thread_info *thread, thread_resume *resume, size_t n) | |
0d62e5e8 | 4447 | { |
d86d4aaf | 4448 | struct lwp_info *lwp = get_thread_lwp (thread); |
64386c31 | 4449 | |
5fdda392 | 4450 | for (int ndx = 0; ndx < n; ndx++) |
95954743 | 4451 | { |
5fdda392 | 4452 | ptid_t ptid = resume[ndx].thread; |
d7e15655 | 4453 | if (ptid == minus_one_ptid |
9c80ecd6 | 4454 | || ptid == thread->id |
0c9070b3 YQ |
4455 | /* Handle both 'pPID' and 'pPID.-1' as meaning 'all threads |
4456 | of PID'. */ | |
e99b03dc | 4457 | || (ptid.pid () == pid_of (thread) |
0e998d96 | 4458 | && (ptid.is_pid () |
e38504b3 | 4459 | || ptid.lwp () == -1))) |
95954743 | 4460 | { |
5fdda392 | 4461 | if (resume[ndx].kind == resume_stop |
8336d594 | 4462 | && thread->last_resume_kind == resume_stop) |
d50171e4 PA |
4463 | { |
4464 | if (debug_threads) | |
87ce2a04 DE |
4465 | debug_printf ("already %s LWP %ld at GDB's request\n", |
4466 | (thread->last_status.kind | |
4467 | == TARGET_WAITKIND_STOPPED) | |
4468 | ? "stopped" | |
4469 | : "stopping", | |
d86d4aaf | 4470 | lwpid_of (thread)); |
d50171e4 PA |
4471 | |
4472 | continue; | |
4473 | } | |
4474 | ||
5a04c4cf PA |
4475 | /* Ignore (wildcard) resume requests for already-resumed |
4476 | threads. */ | |
5fdda392 | 4477 | if (resume[ndx].kind != resume_stop |
5a04c4cf PA |
4478 | && thread->last_resume_kind != resume_stop) |
4479 | { | |
4480 | if (debug_threads) | |
4481 | debug_printf ("already %s LWP %ld at GDB's request\n", | |
4482 | (thread->last_resume_kind | |
4483 | == resume_step) | |
4484 | ? "stepping" | |
4485 | : "continuing", | |
4486 | lwpid_of (thread)); | |
4487 | continue; | |
4488 | } | |
4489 | ||
4490 | /* Don't let wildcard resumes resume fork children that GDB | |
4491 | does not yet know are new fork children. */ | |
4492 | if (lwp->fork_relative != NULL) | |
4493 | { | |
5a04c4cf PA |
4494 | struct lwp_info *rel = lwp->fork_relative; |
4495 | ||
4496 | if (rel->status_pending_p | |
4497 | && (rel->waitstatus.kind == TARGET_WAITKIND_FORKED | |
4498 | || rel->waitstatus.kind == TARGET_WAITKIND_VFORKED)) | |
4499 | { | |
4500 | if (debug_threads) | |
4501 | debug_printf ("not resuming LWP %ld: has queued stop reply\n", | |
4502 | lwpid_of (thread)); | |
4503 | continue; | |
4504 | } | |
4505 | } | |
4506 | ||
4507 | /* If the thread has a pending event that has already been | |
4508 | reported to GDBserver core, but GDB has not pulled the | |
4509 | event out of the vStopped queue yet, likewise, ignore the | |
4510 | (wildcard) resume request. */ | |
9c80ecd6 | 4511 | if (in_queued_stop_replies (thread->id)) |
5a04c4cf PA |
4512 | { |
4513 | if (debug_threads) | |
4514 | debug_printf ("not resuming LWP %ld: has queued stop reply\n", | |
4515 | lwpid_of (thread)); | |
4516 | continue; | |
4517 | } | |
4518 | ||
5fdda392 | 4519 | lwp->resume = &resume[ndx]; |
8336d594 | 4520 | thread->last_resume_kind = lwp->resume->kind; |
fa593d66 | 4521 | |
c2d6af84 PA |
4522 | lwp->step_range_start = lwp->resume->step_range_start; |
4523 | lwp->step_range_end = lwp->resume->step_range_end; | |
4524 | ||
fa593d66 PA |
4525 | /* If we had a deferred signal to report, dequeue one now. |
4526 | This can happen if LWP gets more than one signal while | |
4527 | trying to get out of a jump pad. */ | |
4528 | if (lwp->stopped | |
4529 | && !lwp->status_pending_p | |
4530 | && dequeue_one_deferred_signal (lwp, &lwp->status_pending)) | |
4531 | { | |
4532 | lwp->status_pending_p = 1; | |
4533 | ||
4534 | if (debug_threads) | |
87ce2a04 DE |
4535 | debug_printf ("Dequeueing deferred signal %d for LWP %ld, " |
4536 | "leaving status pending.\n", | |
d86d4aaf DE |
4537 | WSTOPSIG (lwp->status_pending), |
4538 | lwpid_of (thread)); | |
fa593d66 PA |
4539 | } |
4540 | ||
5fdda392 | 4541 | return; |
95954743 PA |
4542 | } |
4543 | } | |
2bd7c093 PA |
4544 | |
4545 | /* No resume action for this thread. */ | |
4546 | lwp->resume = NULL; | |
5544ad89 DJ |
4547 | } |
4548 | ||
8f86d7aa SM |
4549 | /* find_thread callback for linux_resume. Return true if this lwp has an |
4550 | interesting status pending. */ | |
5544ad89 | 4551 | |
25c28b4d SM |
4552 | static bool |
4553 | resume_status_pending_p (thread_info *thread) | |
5544ad89 | 4554 | { |
d86d4aaf | 4555 | struct lwp_info *lwp = get_thread_lwp (thread); |
5544ad89 | 4556 | |
bd99dc85 PA |
4557 | /* LWPs which will not be resumed are not interesting, because |
4558 | we might not wait for them next time through linux_wait. */ | |
2bd7c093 | 4559 | if (lwp->resume == NULL) |
25c28b4d | 4560 | return false; |
64386c31 | 4561 | |
25c28b4d | 4562 | return thread_still_has_status_pending_p (thread); |
d50171e4 PA |
4563 | } |
4564 | ||
4565 | /* Return 1 if this lwp that GDB wants running is stopped at an | |
4566 | internal breakpoint that we need to step over. It assumes that any | |
4567 | required STOP_PC adjustment has already been propagated to the | |
4568 | inferior's regcache. */ | |
4569 | ||
eca55aec SM |
4570 | static bool |
4571 | need_step_over_p (thread_info *thread) | |
d50171e4 | 4572 | { |
d86d4aaf | 4573 | struct lwp_info *lwp = get_thread_lwp (thread); |
0bfdf32f | 4574 | struct thread_info *saved_thread; |
d50171e4 | 4575 | CORE_ADDR pc; |
c06cbd92 YQ |
4576 | struct process_info *proc = get_thread_process (thread); |
4577 | ||
4578 | /* GDBserver is skipping the extra traps from the wrapper program, | |
4579 | don't have to do step over. */ | |
4580 | if (proc->tdesc == NULL) | |
eca55aec | 4581 | return false; |
d50171e4 PA |
4582 | |
4583 | /* LWPs which will not be resumed are not interesting, because we | |
4584 | might not wait for them next time through linux_wait. */ | |
4585 | ||
4586 | if (!lwp->stopped) | |
4587 | { | |
4588 | if (debug_threads) | |
87ce2a04 | 4589 | debug_printf ("Need step over [LWP %ld]? Ignoring, not stopped\n", |
d86d4aaf | 4590 | lwpid_of (thread)); |
eca55aec | 4591 | return false; |
d50171e4 PA |
4592 | } |
4593 | ||
8336d594 | 4594 | if (thread->last_resume_kind == resume_stop) |
d50171e4 PA |
4595 | { |
4596 | if (debug_threads) | |
87ce2a04 DE |
4597 | debug_printf ("Need step over [LWP %ld]? Ignoring, should remain" |
4598 | " stopped\n", | |
d86d4aaf | 4599 | lwpid_of (thread)); |
eca55aec | 4600 | return false; |
d50171e4 PA |
4601 | } |
4602 | ||
7984d532 PA |
4603 | gdb_assert (lwp->suspended >= 0); |
4604 | ||
4605 | if (lwp->suspended) | |
4606 | { | |
4607 | if (debug_threads) | |
87ce2a04 | 4608 | debug_printf ("Need step over [LWP %ld]? Ignoring, suspended\n", |
d86d4aaf | 4609 | lwpid_of (thread)); |
eca55aec | 4610 | return false; |
7984d532 PA |
4611 | } |
4612 | ||
bd99dc85 | 4613 | if (lwp->status_pending_p) |
d50171e4 PA |
4614 | { |
4615 | if (debug_threads) | |
87ce2a04 DE |
4616 | debug_printf ("Need step over [LWP %ld]? Ignoring, has pending" |
4617 | " status.\n", | |
d86d4aaf | 4618 | lwpid_of (thread)); |
eca55aec | 4619 | return false; |
d50171e4 PA |
4620 | } |
4621 | ||
4622 | /* Note: PC, not STOP_PC. Either GDB has adjusted the PC already, | |
4623 | or we have. */ | |
4624 | pc = get_pc (lwp); | |
4625 | ||
4626 | /* If the PC has changed since we stopped, then don't do anything, | |
4627 | and let the breakpoint/tracepoint be hit. This happens if, for | |
4628 | instance, GDB handled the decr_pc_after_break subtraction itself, | |
4629 | GDB is OOL stepping this thread, or the user has issued a "jump" | |
4630 | command, or poked thread's registers herself. */ | |
4631 | if (pc != lwp->stop_pc) | |
4632 | { | |
4633 | if (debug_threads) | |
87ce2a04 DE |
4634 | debug_printf ("Need step over [LWP %ld]? Cancelling, PC was changed. " |
4635 | "Old stop_pc was 0x%s, PC is now 0x%s\n", | |
d86d4aaf DE |
4636 | lwpid_of (thread), |
4637 | paddress (lwp->stop_pc), paddress (pc)); | |
eca55aec | 4638 | return false; |
d50171e4 PA |
4639 | } |
4640 | ||
484b3c32 YQ |
4641 | /* On software single step target, resume the inferior with signal |
4642 | rather than stepping over. */ | |
4643 | if (can_software_single_step () | |
4644 | && lwp->pending_signals != NULL | |
4645 | && lwp_signal_can_be_delivered (lwp)) | |
4646 | { | |
4647 | if (debug_threads) | |
4648 | debug_printf ("Need step over [LWP %ld]? Ignoring, has pending" | |
4649 | " signals.\n", | |
4650 | lwpid_of (thread)); | |
4651 | ||
eca55aec | 4652 | return false; |
484b3c32 YQ |
4653 | } |
4654 | ||
0bfdf32f GB |
4655 | saved_thread = current_thread; |
4656 | current_thread = thread; | |
d50171e4 | 4657 | |
8b07ae33 | 4658 | /* We can only step over breakpoints we know about. */ |
fa593d66 | 4659 | if (breakpoint_here (pc) || fast_tracepoint_jump_here (pc)) |
d50171e4 | 4660 | { |
8b07ae33 | 4661 | /* Don't step over a breakpoint that GDB expects to hit |
9f3a5c85 LM |
4662 | though. If the condition is being evaluated on the target's side |
4663 | and it evaluate to false, step over this breakpoint as well. */ | |
4664 | if (gdb_breakpoint_here (pc) | |
d3ce09f5 SS |
4665 | && gdb_condition_true_at_breakpoint (pc) |
4666 | && gdb_no_commands_at_breakpoint (pc)) | |
8b07ae33 PA |
4667 | { |
4668 | if (debug_threads) | |
87ce2a04 DE |
4669 | debug_printf ("Need step over [LWP %ld]? yes, but found" |
4670 | " GDB breakpoint at 0x%s; skipping step over\n", | |
d86d4aaf | 4671 | lwpid_of (thread), paddress (pc)); |
d50171e4 | 4672 | |
0bfdf32f | 4673 | current_thread = saved_thread; |
eca55aec | 4674 | return false; |
8b07ae33 PA |
4675 | } |
4676 | else | |
4677 | { | |
4678 | if (debug_threads) | |
87ce2a04 DE |
4679 | debug_printf ("Need step over [LWP %ld]? yes, " |
4680 | "found breakpoint at 0x%s\n", | |
d86d4aaf | 4681 | lwpid_of (thread), paddress (pc)); |
d50171e4 | 4682 | |
8b07ae33 | 4683 | /* We've found an lwp that needs stepping over --- return 1 so |
8f86d7aa | 4684 | that find_thread stops looking. */ |
0bfdf32f | 4685 | current_thread = saved_thread; |
8b07ae33 | 4686 | |
eca55aec | 4687 | return true; |
8b07ae33 | 4688 | } |
d50171e4 PA |
4689 | } |
4690 | ||
0bfdf32f | 4691 | current_thread = saved_thread; |
d50171e4 PA |
4692 | |
4693 | if (debug_threads) | |
87ce2a04 DE |
4694 | debug_printf ("Need step over [LWP %ld]? No, no breakpoint found" |
4695 | " at 0x%s\n", | |
d86d4aaf | 4696 | lwpid_of (thread), paddress (pc)); |
c6ecbae5 | 4697 | |
eca55aec | 4698 | return false; |
5544ad89 DJ |
4699 | } |
4700 | ||
d16f3f6c TBA |
4701 | void |
4702 | linux_process_target::start_step_over (lwp_info *lwp) | |
d50171e4 | 4703 | { |
d86d4aaf | 4704 | struct thread_info *thread = get_lwp_thread (lwp); |
0bfdf32f | 4705 | struct thread_info *saved_thread; |
d50171e4 PA |
4706 | CORE_ADDR pc; |
4707 | int step; | |
4708 | ||
4709 | if (debug_threads) | |
87ce2a04 | 4710 | debug_printf ("Starting step-over on LWP %ld. Stopping all threads\n", |
d86d4aaf | 4711 | lwpid_of (thread)); |
d50171e4 | 4712 | |
7984d532 | 4713 | stop_all_lwps (1, lwp); |
863d01bd PA |
4714 | |
4715 | if (lwp->suspended != 0) | |
4716 | { | |
4717 | internal_error (__FILE__, __LINE__, | |
4718 | "LWP %ld suspended=%d\n", lwpid_of (thread), | |
4719 | lwp->suspended); | |
4720 | } | |
d50171e4 PA |
4721 | |
4722 | if (debug_threads) | |
87ce2a04 | 4723 | debug_printf ("Done stopping all threads for step-over.\n"); |
d50171e4 PA |
4724 | |
4725 | /* Note, we should always reach here with an already adjusted PC, | |
4726 | either by GDB (if we're resuming due to GDB's request), or by our | |
4727 | caller, if we just finished handling an internal breakpoint GDB | |
4728 | shouldn't care about. */ | |
4729 | pc = get_pc (lwp); | |
4730 | ||
0bfdf32f GB |
4731 | saved_thread = current_thread; |
4732 | current_thread = thread; | |
d50171e4 PA |
4733 | |
4734 | lwp->bp_reinsert = pc; | |
4735 | uninsert_breakpoints_at (pc); | |
fa593d66 | 4736 | uninsert_fast_tracepoint_jumps_at (pc); |
d50171e4 | 4737 | |
7fe5e27e | 4738 | step = single_step (lwp); |
d50171e4 | 4739 | |
0bfdf32f | 4740 | current_thread = saved_thread; |
d50171e4 PA |
4741 | |
4742 | linux_resume_one_lwp (lwp, step, 0, NULL); | |
4743 | ||
4744 | /* Require next event from this LWP. */ | |
9c80ecd6 | 4745 | step_over_bkpt = thread->id; |
d50171e4 PA |
4746 | } |
4747 | ||
4748 | /* Finish a step-over. Reinsert the breakpoint we had uninserted in | |
3b9a79ef | 4749 | start_step_over, if still there, and delete any single-step |
d50171e4 PA |
4750 | breakpoints we've set, on non hardware single-step targets. */ |
4751 | ||
4752 | static int | |
4753 | finish_step_over (struct lwp_info *lwp) | |
4754 | { | |
4755 | if (lwp->bp_reinsert != 0) | |
4756 | { | |
f79b145d YQ |
4757 | struct thread_info *saved_thread = current_thread; |
4758 | ||
d50171e4 | 4759 | if (debug_threads) |
87ce2a04 | 4760 | debug_printf ("Finished step over.\n"); |
d50171e4 | 4761 | |
f79b145d YQ |
4762 | current_thread = get_lwp_thread (lwp); |
4763 | ||
d50171e4 PA |
4764 | /* Reinsert any breakpoint at LWP->BP_REINSERT. Note that there |
4765 | may be no breakpoint to reinsert there by now. */ | |
4766 | reinsert_breakpoints_at (lwp->bp_reinsert); | |
fa593d66 | 4767 | reinsert_fast_tracepoint_jumps_at (lwp->bp_reinsert); |
d50171e4 PA |
4768 | |
4769 | lwp->bp_reinsert = 0; | |
4770 | ||
3b9a79ef YQ |
4771 | /* Delete any single-step breakpoints. No longer needed. We |
4772 | don't have to worry about other threads hitting this trap, | |
4773 | and later not being able to explain it, because we were | |
4774 | stepping over a breakpoint, and we hold all threads but | |
4775 | LWP stopped while doing that. */ | |
d50171e4 | 4776 | if (!can_hardware_single_step ()) |
f79b145d | 4777 | { |
3b9a79ef YQ |
4778 | gdb_assert (has_single_step_breakpoints (current_thread)); |
4779 | delete_single_step_breakpoints (current_thread); | |
f79b145d | 4780 | } |
d50171e4 PA |
4781 | |
4782 | step_over_bkpt = null_ptid; | |
f79b145d | 4783 | current_thread = saved_thread; |
d50171e4 PA |
4784 | return 1; |
4785 | } | |
4786 | else | |
4787 | return 0; | |
4788 | } | |
4789 | ||
d16f3f6c TBA |
4790 | void |
4791 | linux_process_target::complete_ongoing_step_over () | |
863d01bd | 4792 | { |
d7e15655 | 4793 | if (step_over_bkpt != null_ptid) |
863d01bd PA |
4794 | { |
4795 | struct lwp_info *lwp; | |
4796 | int wstat; | |
4797 | int ret; | |
4798 | ||
4799 | if (debug_threads) | |
4800 | debug_printf ("detach: step over in progress, finish it first\n"); | |
4801 | ||
4802 | /* Passing NULL_PTID as filter indicates we want all events to | |
4803 | be left pending. Eventually this returns when there are no | |
4804 | unwaited-for children left. */ | |
d16f3f6c TBA |
4805 | ret = wait_for_event_filtered (minus_one_ptid, null_ptid, &wstat, |
4806 | __WALL); | |
863d01bd PA |
4807 | gdb_assert (ret == -1); |
4808 | ||
4809 | lwp = find_lwp_pid (step_over_bkpt); | |
4810 | if (lwp != NULL) | |
4811 | finish_step_over (lwp); | |
4812 | step_over_bkpt = null_ptid; | |
4813 | unsuspend_all_lwps (lwp); | |
4814 | } | |
4815 | } | |
4816 | ||
5544ad89 DJ |
4817 | /* This function is called once per thread. We check the thread's resume |
4818 | request, which will tell us whether to resume, step, or leave the thread | |
bd99dc85 | 4819 | stopped; and what signal, if any, it should be sent. |
5544ad89 | 4820 | |
bd99dc85 PA |
4821 | For threads which we aren't explicitly told otherwise, we preserve |
4822 | the stepping flag; this is used for stepping over gdbserver-placed | |
4823 | breakpoints. | |
4824 | ||
4825 | If pending_flags was set in any thread, we queue any needed | |
4826 | signals, since we won't actually resume. We already have a pending | |
4827 | event to report, so we don't need to preserve any step requests; | |
4828 | they should be re-issued if necessary. */ | |
4829 | ||
c80825ff SM |
4830 | static void |
4831 | linux_resume_one_thread (thread_info *thread, bool leave_all_stopped) | |
5544ad89 | 4832 | { |
d86d4aaf | 4833 | struct lwp_info *lwp = get_thread_lwp (thread); |
d50171e4 | 4834 | int leave_pending; |
5544ad89 | 4835 | |
2bd7c093 | 4836 | if (lwp->resume == NULL) |
c80825ff | 4837 | return; |
5544ad89 | 4838 | |
bd99dc85 | 4839 | if (lwp->resume->kind == resume_stop) |
5544ad89 | 4840 | { |
bd99dc85 | 4841 | if (debug_threads) |
d86d4aaf | 4842 | debug_printf ("resume_stop request for LWP %ld\n", lwpid_of (thread)); |
bd99dc85 PA |
4843 | |
4844 | if (!lwp->stopped) | |
4845 | { | |
4846 | if (debug_threads) | |
d86d4aaf | 4847 | debug_printf ("stopping LWP %ld\n", lwpid_of (thread)); |
bd99dc85 | 4848 | |
d50171e4 PA |
4849 | /* Stop the thread, and wait for the event asynchronously, |
4850 | through the event loop. */ | |
02fc4de7 | 4851 | send_sigstop (lwp); |
bd99dc85 PA |
4852 | } |
4853 | else | |
4854 | { | |
4855 | if (debug_threads) | |
87ce2a04 | 4856 | debug_printf ("already stopped LWP %ld\n", |
d86d4aaf | 4857 | lwpid_of (thread)); |
d50171e4 PA |
4858 | |
4859 | /* The LWP may have been stopped in an internal event that | |
4860 | was not meant to be notified back to GDB (e.g., gdbserver | |
4861 | breakpoint), so we should be reporting a stop event in | |
4862 | this case too. */ | |
4863 | ||
4864 | /* If the thread already has a pending SIGSTOP, this is a | |
4865 | no-op. Otherwise, something later will presumably resume | |
4866 | the thread and this will cause it to cancel any pending | |
4867 | operation, due to last_resume_kind == resume_stop. If | |
4868 | the thread already has a pending status to report, we | |
4869 | will still report it the next time we wait - see | |
4870 | status_pending_p_callback. */ | |
1a981360 PA |
4871 | |
4872 | /* If we already have a pending signal to report, then | |
4873 | there's no need to queue a SIGSTOP, as this means we're | |
4874 | midway through moving the LWP out of the jumppad, and we | |
4875 | will report the pending signal as soon as that is | |
4876 | finished. */ | |
4877 | if (lwp->pending_signals_to_report == NULL) | |
4878 | send_sigstop (lwp); | |
bd99dc85 | 4879 | } |
32ca6d61 | 4880 | |
bd99dc85 PA |
4881 | /* For stop requests, we're done. */ |
4882 | lwp->resume = NULL; | |
fc7238bb | 4883 | thread->last_status.kind = TARGET_WAITKIND_IGNORE; |
c80825ff | 4884 | return; |
5544ad89 DJ |
4885 | } |
4886 | ||
bd99dc85 | 4887 | /* If this thread which is about to be resumed has a pending status, |
863d01bd PA |
4888 | then don't resume it - we can just report the pending status. |
4889 | Likewise if it is suspended, because e.g., another thread is | |
4890 | stepping past a breakpoint. Make sure to queue any signals that | |
4891 | would otherwise be sent. In all-stop mode, we do this decision | |
4892 | based on if *any* thread has a pending status. If there's a | |
4893 | thread that needs the step-over-breakpoint dance, then don't | |
4894 | resume any other thread but that particular one. */ | |
4895 | leave_pending = (lwp->suspended | |
4896 | || lwp->status_pending_p | |
4897 | || leave_all_stopped); | |
5544ad89 | 4898 | |
0e9a339e YQ |
4899 | /* If we have a new signal, enqueue the signal. */ |
4900 | if (lwp->resume->sig != 0) | |
4901 | { | |
4902 | siginfo_t info, *info_p; | |
4903 | ||
4904 | /* If this is the same signal we were previously stopped by, | |
4905 | make sure to queue its siginfo. */ | |
4906 | if (WIFSTOPPED (lwp->last_status) | |
4907 | && WSTOPSIG (lwp->last_status) == lwp->resume->sig | |
4908 | && ptrace (PTRACE_GETSIGINFO, lwpid_of (thread), | |
4909 | (PTRACE_TYPE_ARG3) 0, &info) == 0) | |
4910 | info_p = &info; | |
4911 | else | |
4912 | info_p = NULL; | |
4913 | ||
4914 | enqueue_pending_signal (lwp, lwp->resume->sig, info_p); | |
4915 | } | |
4916 | ||
d50171e4 | 4917 | if (!leave_pending) |
bd99dc85 PA |
4918 | { |
4919 | if (debug_threads) | |
d86d4aaf | 4920 | debug_printf ("resuming LWP %ld\n", lwpid_of (thread)); |
5544ad89 | 4921 | |
9c80ecd6 | 4922 | proceed_one_lwp (thread, NULL); |
bd99dc85 PA |
4923 | } |
4924 | else | |
4925 | { | |
4926 | if (debug_threads) | |
d86d4aaf | 4927 | debug_printf ("leaving LWP %ld stopped\n", lwpid_of (thread)); |
bd99dc85 | 4928 | } |
5544ad89 | 4929 | |
fc7238bb | 4930 | thread->last_status.kind = TARGET_WAITKIND_IGNORE; |
bd99dc85 | 4931 | lwp->resume = NULL; |
0d62e5e8 DJ |
4932 | } |
4933 | ||
0e4d7e35 TBA |
4934 | void |
4935 | linux_process_target::resume (thread_resume *resume_info, size_t n) | |
0d62e5e8 | 4936 | { |
d86d4aaf | 4937 | struct thread_info *need_step_over = NULL; |
c6ecbae5 | 4938 | |
87ce2a04 DE |
4939 | if (debug_threads) |
4940 | { | |
4941 | debug_enter (); | |
4942 | debug_printf ("linux_resume:\n"); | |
4943 | } | |
4944 | ||
5fdda392 SM |
4945 | for_each_thread ([&] (thread_info *thread) |
4946 | { | |
4947 | linux_set_resume_request (thread, resume_info, n); | |
4948 | }); | |
5544ad89 | 4949 | |
d50171e4 PA |
4950 | /* If there is a thread which would otherwise be resumed, which has |
4951 | a pending status, then don't resume any threads - we can just | |
4952 | report the pending status. Make sure to queue any signals that | |
4953 | would otherwise be sent. In non-stop mode, we'll apply this | |
4954 | logic to each thread individually. We consume all pending events | |
4955 | before considering to start a step-over (in all-stop). */ | |
25c28b4d | 4956 | bool any_pending = false; |
bd99dc85 | 4957 | if (!non_stop) |
25c28b4d | 4958 | any_pending = find_thread (resume_status_pending_p) != NULL; |
d50171e4 PA |
4959 | |
4960 | /* If there is a thread which would otherwise be resumed, which is | |
4961 | stopped at a breakpoint that needs stepping over, then don't | |
4962 | resume any threads - have it step over the breakpoint with all | |
4963 | other threads stopped, then resume all threads again. Make sure | |
4964 | to queue any signals that would otherwise be delivered or | |
4965 | queued. */ | |
4966 | if (!any_pending && supports_breakpoints ()) | |
eca55aec | 4967 | need_step_over = find_thread (need_step_over_p); |
d50171e4 | 4968 | |
c80825ff | 4969 | bool leave_all_stopped = (need_step_over != NULL || any_pending); |
d50171e4 PA |
4970 | |
4971 | if (debug_threads) | |
4972 | { | |
4973 | if (need_step_over != NULL) | |
87ce2a04 | 4974 | debug_printf ("Not resuming all, need step over\n"); |
d50171e4 | 4975 | else if (any_pending) |
87ce2a04 DE |
4976 | debug_printf ("Not resuming, all-stop and found " |
4977 | "an LWP with pending status\n"); | |
d50171e4 | 4978 | else |
87ce2a04 | 4979 | debug_printf ("Resuming, no pending status or step over needed\n"); |
d50171e4 PA |
4980 | } |
4981 | ||
4982 | /* Even if we're leaving threads stopped, queue all signals we'd | |
4983 | otherwise deliver. */ | |
c80825ff SM |
4984 | for_each_thread ([&] (thread_info *thread) |
4985 | { | |
4986 | linux_resume_one_thread (thread, leave_all_stopped); | |
4987 | }); | |
d50171e4 PA |
4988 | |
4989 | if (need_step_over) | |
d86d4aaf | 4990 | start_step_over (get_thread_lwp (need_step_over)); |
87ce2a04 DE |
4991 | |
4992 | if (debug_threads) | |
4993 | { | |
4994 | debug_printf ("linux_resume done\n"); | |
4995 | debug_exit (); | |
4996 | } | |
1bebeeca PA |
4997 | |
4998 | /* We may have events that were pending that can/should be sent to | |
4999 | the client now. Trigger a linux_wait call. */ | |
5000 | if (target_is_async_p ()) | |
5001 | async_file_mark (); | |
d50171e4 PA |
5002 | } |
5003 | ||
5004 | /* This function is called once per thread. We check the thread's | |
5005 | last resume request, which will tell us whether to resume, step, or | |
5006 | leave the thread stopped. Any signal the client requested to be | |
5007 | delivered has already been enqueued at this point. | |
5008 | ||
5009 | If any thread that GDB wants running is stopped at an internal | |
5010 | breakpoint that needs stepping over, we start a step-over operation | |
5011 | on that particular thread, and leave all others stopped. */ | |
5012 | ||
e2b44075 SM |
5013 | static void |
5014 | proceed_one_lwp (thread_info *thread, lwp_info *except) | |
d50171e4 | 5015 | { |
d86d4aaf | 5016 | struct lwp_info *lwp = get_thread_lwp (thread); |
d50171e4 PA |
5017 | int step; |
5018 | ||
7984d532 | 5019 | if (lwp == except) |
e2b44075 | 5020 | return; |
d50171e4 PA |
5021 | |
5022 | if (debug_threads) | |
d86d4aaf | 5023 | debug_printf ("proceed_one_lwp: lwp %ld\n", lwpid_of (thread)); |
d50171e4 PA |
5024 | |
5025 | if (!lwp->stopped) | |
5026 | { | |
5027 | if (debug_threads) | |
d86d4aaf | 5028 | debug_printf (" LWP %ld already running\n", lwpid_of (thread)); |
e2b44075 | 5029 | return; |
d50171e4 PA |
5030 | } |
5031 | ||
02fc4de7 PA |
5032 | if (thread->last_resume_kind == resume_stop |
5033 | && thread->last_status.kind != TARGET_WAITKIND_IGNORE) | |
d50171e4 PA |
5034 | { |
5035 | if (debug_threads) | |
87ce2a04 | 5036 | debug_printf (" client wants LWP to remain %ld stopped\n", |
d86d4aaf | 5037 | lwpid_of (thread)); |
e2b44075 | 5038 | return; |
d50171e4 PA |
5039 | } |
5040 | ||
5041 | if (lwp->status_pending_p) | |
5042 | { | |
5043 | if (debug_threads) | |
87ce2a04 | 5044 | debug_printf (" LWP %ld has pending status, leaving stopped\n", |
d86d4aaf | 5045 | lwpid_of (thread)); |
e2b44075 | 5046 | return; |
d50171e4 PA |
5047 | } |
5048 | ||
7984d532 PA |
5049 | gdb_assert (lwp->suspended >= 0); |
5050 | ||
d50171e4 PA |
5051 | if (lwp->suspended) |
5052 | { | |
5053 | if (debug_threads) | |
d86d4aaf | 5054 | debug_printf (" LWP %ld is suspended\n", lwpid_of (thread)); |
e2b44075 | 5055 | return; |
d50171e4 PA |
5056 | } |
5057 | ||
1a981360 PA |
5058 | if (thread->last_resume_kind == resume_stop |
5059 | && lwp->pending_signals_to_report == NULL | |
229d26fc SM |
5060 | && (lwp->collecting_fast_tracepoint |
5061 | == fast_tpoint_collect_result::not_collecting)) | |
02fc4de7 PA |
5062 | { |
5063 | /* We haven't reported this LWP as stopped yet (otherwise, the | |
5064 | last_status.kind check above would catch it, and we wouldn't | |
5065 | reach here. This LWP may have been momentarily paused by a | |
5066 | stop_all_lwps call while handling for example, another LWP's | |
5067 | step-over. In that case, the pending expected SIGSTOP signal | |
5068 | that was queued at vCont;t handling time will have already | |
5069 | been consumed by wait_for_sigstop, and so we need to requeue | |
5070 | another one here. Note that if the LWP already has a SIGSTOP | |
5071 | pending, this is a no-op. */ | |
5072 | ||
5073 | if (debug_threads) | |
87ce2a04 DE |
5074 | debug_printf ("Client wants LWP %ld to stop. " |
5075 | "Making sure it has a SIGSTOP pending\n", | |
d86d4aaf | 5076 | lwpid_of (thread)); |
02fc4de7 PA |
5077 | |
5078 | send_sigstop (lwp); | |
5079 | } | |
5080 | ||
863d01bd PA |
5081 | if (thread->last_resume_kind == resume_step) |
5082 | { | |
5083 | if (debug_threads) | |
5084 | debug_printf (" stepping LWP %ld, client wants it stepping\n", | |
5085 | lwpid_of (thread)); | |
8901d193 | 5086 | |
3b9a79ef | 5087 | /* If resume_step is requested by GDB, install single-step |
8901d193 | 5088 | breakpoints when the thread is about to be actually resumed if |
3b9a79ef YQ |
5089 | the single-step breakpoints weren't removed. */ |
5090 | if (can_software_single_step () | |
5091 | && !has_single_step_breakpoints (thread)) | |
8901d193 YQ |
5092 | install_software_single_step_breakpoints (lwp); |
5093 | ||
5094 | step = maybe_hw_step (thread); | |
863d01bd PA |
5095 | } |
5096 | else if (lwp->bp_reinsert != 0) | |
5097 | { | |
5098 | if (debug_threads) | |
5099 | debug_printf (" stepping LWP %ld, reinsert set\n", | |
5100 | lwpid_of (thread)); | |
f79b145d YQ |
5101 | |
5102 | step = maybe_hw_step (thread); | |
863d01bd PA |
5103 | } |
5104 | else | |
5105 | step = 0; | |
5106 | ||
d50171e4 | 5107 | linux_resume_one_lwp (lwp, step, 0, NULL); |
7984d532 PA |
5108 | } |
5109 | ||
e2b44075 SM |
5110 | static void |
5111 | unsuspend_and_proceed_one_lwp (thread_info *thread, lwp_info *except) | |
7984d532 | 5112 | { |
d86d4aaf | 5113 | struct lwp_info *lwp = get_thread_lwp (thread); |
7984d532 PA |
5114 | |
5115 | if (lwp == except) | |
e2b44075 | 5116 | return; |
7984d532 | 5117 | |
863d01bd | 5118 | lwp_suspended_decr (lwp); |
7984d532 | 5119 | |
e2b44075 | 5120 | proceed_one_lwp (thread, except); |
d50171e4 PA |
5121 | } |
5122 | ||
d16f3f6c TBA |
5123 | void |
5124 | linux_process_target::proceed_all_lwps () | |
d50171e4 | 5125 | { |
d86d4aaf | 5126 | struct thread_info *need_step_over; |
d50171e4 PA |
5127 | |
5128 | /* If there is a thread which would otherwise be resumed, which is | |
5129 | stopped at a breakpoint that needs stepping over, then don't | |
5130 | resume any threads - have it step over the breakpoint with all | |
5131 | other threads stopped, then resume all threads again. */ | |
5132 | ||
5133 | if (supports_breakpoints ()) | |
5134 | { | |
eca55aec | 5135 | need_step_over = find_thread (need_step_over_p); |
d50171e4 PA |
5136 | |
5137 | if (need_step_over != NULL) | |
5138 | { | |
5139 | if (debug_threads) | |
87ce2a04 DE |
5140 | debug_printf ("proceed_all_lwps: found " |
5141 | "thread %ld needing a step-over\n", | |
5142 | lwpid_of (need_step_over)); | |
d50171e4 | 5143 | |
d86d4aaf | 5144 | start_step_over (get_thread_lwp (need_step_over)); |
d50171e4 PA |
5145 | return; |
5146 | } | |
5147 | } | |
5544ad89 | 5148 | |
d50171e4 | 5149 | if (debug_threads) |
87ce2a04 | 5150 | debug_printf ("Proceeding, no step-over needed\n"); |
d50171e4 | 5151 | |
e2b44075 SM |
5152 | for_each_thread ([] (thread_info *thread) |
5153 | { | |
5154 | proceed_one_lwp (thread, NULL); | |
5155 | }); | |
d50171e4 PA |
5156 | } |
5157 | ||
d16f3f6c TBA |
5158 | void |
5159 | linux_process_target::unstop_all_lwps (int unsuspend, lwp_info *except) | |
d50171e4 | 5160 | { |
5544ad89 DJ |
5161 | if (debug_threads) |
5162 | { | |
87ce2a04 | 5163 | debug_enter (); |
d50171e4 | 5164 | if (except) |
87ce2a04 | 5165 | debug_printf ("unstopping all lwps, except=(LWP %ld)\n", |
d86d4aaf | 5166 | lwpid_of (get_lwp_thread (except))); |
5544ad89 | 5167 | else |
87ce2a04 | 5168 | debug_printf ("unstopping all lwps\n"); |
5544ad89 DJ |
5169 | } |
5170 | ||
7984d532 | 5171 | if (unsuspend) |
e2b44075 SM |
5172 | for_each_thread ([&] (thread_info *thread) |
5173 | { | |
5174 | unsuspend_and_proceed_one_lwp (thread, except); | |
5175 | }); | |
7984d532 | 5176 | else |
e2b44075 SM |
5177 | for_each_thread ([&] (thread_info *thread) |
5178 | { | |
5179 | proceed_one_lwp (thread, except); | |
5180 | }); | |
87ce2a04 DE |
5181 | |
5182 | if (debug_threads) | |
5183 | { | |
5184 | debug_printf ("unstop_all_lwps done\n"); | |
5185 | debug_exit (); | |
5186 | } | |
0d62e5e8 DJ |
5187 | } |
5188 | ||
58caa3dc DJ |
5189 | |
5190 | #ifdef HAVE_LINUX_REGSETS | |
5191 | ||
1faeff08 MR |
5192 | #define use_linux_regsets 1 |
5193 | ||
030031ee PA |
5194 | /* Returns true if REGSET has been disabled. */ |
5195 | ||
5196 | static int | |
5197 | regset_disabled (struct regsets_info *info, struct regset_info *regset) | |
5198 | { | |
5199 | return (info->disabled_regsets != NULL | |
5200 | && info->disabled_regsets[regset - info->regsets]); | |
5201 | } | |
5202 | ||
5203 | /* Disable REGSET. */ | |
5204 | ||
5205 | static void | |
5206 | disable_regset (struct regsets_info *info, struct regset_info *regset) | |
5207 | { | |
5208 | int dr_offset; | |
5209 | ||
5210 | dr_offset = regset - info->regsets; | |
5211 | if (info->disabled_regsets == NULL) | |
224c3ddb | 5212 | info->disabled_regsets = (char *) xcalloc (1, info->num_regsets); |
030031ee PA |
5213 | info->disabled_regsets[dr_offset] = 1; |
5214 | } | |
5215 | ||
58caa3dc | 5216 | static int |
3aee8918 PA |
5217 | regsets_fetch_inferior_registers (struct regsets_info *regsets_info, |
5218 | struct regcache *regcache) | |
58caa3dc DJ |
5219 | { |
5220 | struct regset_info *regset; | |
e9d25b98 | 5221 | int saw_general_regs = 0; |
95954743 | 5222 | int pid; |
1570b33e | 5223 | struct iovec iov; |
58caa3dc | 5224 | |
0bfdf32f | 5225 | pid = lwpid_of (current_thread); |
28eef672 | 5226 | for (regset = regsets_info->regsets; regset->size >= 0; regset++) |
58caa3dc | 5227 | { |
1570b33e L |
5228 | void *buf, *data; |
5229 | int nt_type, res; | |
58caa3dc | 5230 | |
030031ee | 5231 | if (regset->size == 0 || regset_disabled (regsets_info, regset)) |
28eef672 | 5232 | continue; |
58caa3dc | 5233 | |
bca929d3 | 5234 | buf = xmalloc (regset->size); |
1570b33e L |
5235 | |
5236 | nt_type = regset->nt_type; | |
5237 | if (nt_type) | |
5238 | { | |
5239 | iov.iov_base = buf; | |
5240 | iov.iov_len = regset->size; | |
5241 | data = (void *) &iov; | |
5242 | } | |
5243 | else | |
5244 | data = buf; | |
5245 | ||
dfb64f85 | 5246 | #ifndef __sparc__ |
f15f9948 | 5247 | res = ptrace (regset->get_request, pid, |
b8e1b30e | 5248 | (PTRACE_TYPE_ARG3) (long) nt_type, data); |
dfb64f85 | 5249 | #else |
1570b33e | 5250 | res = ptrace (regset->get_request, pid, data, nt_type); |
dfb64f85 | 5251 | #endif |
58caa3dc DJ |
5252 | if (res < 0) |
5253 | { | |
1ef53e6b AH |
5254 | if (errno == EIO |
5255 | || (errno == EINVAL && regset->type == OPTIONAL_REGS)) | |
58caa3dc | 5256 | { |
1ef53e6b AH |
5257 | /* If we get EIO on a regset, or an EINVAL and the regset is |
5258 | optional, do not try it again for this process mode. */ | |
030031ee | 5259 | disable_regset (regsets_info, regset); |
58caa3dc | 5260 | } |
e5a9158d AA |
5261 | else if (errno == ENODATA) |
5262 | { | |
5263 | /* ENODATA may be returned if the regset is currently | |
5264 | not "active". This can happen in normal operation, | |
5265 | so suppress the warning in this case. */ | |
5266 | } | |
fcd4a73d YQ |
5267 | else if (errno == ESRCH) |
5268 | { | |
5269 | /* At this point, ESRCH should mean the process is | |
5270 | already gone, in which case we simply ignore attempts | |
5271 | to read its registers. */ | |
5272 | } | |
58caa3dc DJ |
5273 | else |
5274 | { | |
0d62e5e8 | 5275 | char s[256]; |
95954743 PA |
5276 | sprintf (s, "ptrace(regsets_fetch_inferior_registers) PID=%d", |
5277 | pid); | |
0d62e5e8 | 5278 | perror (s); |
58caa3dc DJ |
5279 | } |
5280 | } | |
098dbe61 AA |
5281 | else |
5282 | { | |
5283 | if (regset->type == GENERAL_REGS) | |
5284 | saw_general_regs = 1; | |
5285 | regset->store_function (regcache, buf); | |
5286 | } | |
fdeb2a12 | 5287 | free (buf); |
58caa3dc | 5288 | } |
e9d25b98 DJ |
5289 | if (saw_general_regs) |
5290 | return 0; | |
5291 | else | |
5292 | return 1; | |
58caa3dc DJ |
5293 | } |
5294 | ||
5295 | static int | |
3aee8918 PA |
5296 | regsets_store_inferior_registers (struct regsets_info *regsets_info, |
5297 | struct regcache *regcache) | |
58caa3dc DJ |
5298 | { |
5299 | struct regset_info *regset; | |
e9d25b98 | 5300 | int saw_general_regs = 0; |
95954743 | 5301 | int pid; |
1570b33e | 5302 | struct iovec iov; |
58caa3dc | 5303 | |
0bfdf32f | 5304 | pid = lwpid_of (current_thread); |
28eef672 | 5305 | for (regset = regsets_info->regsets; regset->size >= 0; regset++) |
58caa3dc | 5306 | { |
1570b33e L |
5307 | void *buf, *data; |
5308 | int nt_type, res; | |
58caa3dc | 5309 | |
feea5f36 AA |
5310 | if (regset->size == 0 || regset_disabled (regsets_info, regset) |
5311 | || regset->fill_function == NULL) | |
28eef672 | 5312 | continue; |
58caa3dc | 5313 | |
bca929d3 | 5314 | buf = xmalloc (regset->size); |
545587ee DJ |
5315 | |
5316 | /* First fill the buffer with the current register set contents, | |
5317 | in case there are any items in the kernel's regset that are | |
5318 | not in gdbserver's regcache. */ | |
1570b33e L |
5319 | |
5320 | nt_type = regset->nt_type; | |
5321 | if (nt_type) | |
5322 | { | |
5323 | iov.iov_base = buf; | |
5324 | iov.iov_len = regset->size; | |
5325 | data = (void *) &iov; | |
5326 | } | |
5327 | else | |
5328 | data = buf; | |
5329 | ||
dfb64f85 | 5330 | #ifndef __sparc__ |
f15f9948 | 5331 | res = ptrace (regset->get_request, pid, |
b8e1b30e | 5332 | (PTRACE_TYPE_ARG3) (long) nt_type, data); |
dfb64f85 | 5333 | #else |
689cc2ae | 5334 | res = ptrace (regset->get_request, pid, data, nt_type); |
dfb64f85 | 5335 | #endif |
545587ee DJ |
5336 | |
5337 | if (res == 0) | |
5338 | { | |
5339 | /* Then overlay our cached registers on that. */ | |
442ea881 | 5340 | regset->fill_function (regcache, buf); |
545587ee DJ |
5341 | |
5342 | /* Only now do we write the register set. */ | |
dfb64f85 | 5343 | #ifndef __sparc__ |
f15f9948 | 5344 | res = ptrace (regset->set_request, pid, |
b8e1b30e | 5345 | (PTRACE_TYPE_ARG3) (long) nt_type, data); |
dfb64f85 | 5346 | #else |
1570b33e | 5347 | res = ptrace (regset->set_request, pid, data, nt_type); |
dfb64f85 | 5348 | #endif |
545587ee DJ |
5349 | } |
5350 | ||
58caa3dc DJ |
5351 | if (res < 0) |
5352 | { | |
1ef53e6b AH |
5353 | if (errno == EIO |
5354 | || (errno == EINVAL && regset->type == OPTIONAL_REGS)) | |
58caa3dc | 5355 | { |
1ef53e6b AH |
5356 | /* If we get EIO on a regset, or an EINVAL and the regset is |
5357 | optional, do not try it again for this process mode. */ | |
030031ee | 5358 | disable_regset (regsets_info, regset); |
58caa3dc | 5359 | } |
3221518c UW |
5360 | else if (errno == ESRCH) |
5361 | { | |
1b3f6016 PA |
5362 | /* At this point, ESRCH should mean the process is |
5363 | already gone, in which case we simply ignore attempts | |
5364 | to change its registers. See also the related | |
5365 | comment in linux_resume_one_lwp. */ | |
fdeb2a12 | 5366 | free (buf); |
3221518c UW |
5367 | return 0; |
5368 | } | |
58caa3dc DJ |
5369 | else |
5370 | { | |
ce3a066d | 5371 | perror ("Warning: ptrace(regsets_store_inferior_registers)"); |
58caa3dc DJ |
5372 | } |
5373 | } | |
e9d25b98 DJ |
5374 | else if (regset->type == GENERAL_REGS) |
5375 | saw_general_regs = 1; | |
09ec9b38 | 5376 | free (buf); |
58caa3dc | 5377 | } |
e9d25b98 DJ |
5378 | if (saw_general_regs) |
5379 | return 0; | |
5380 | else | |
5381 | return 1; | |
58caa3dc DJ |
5382 | } |
5383 | ||
1faeff08 | 5384 | #else /* !HAVE_LINUX_REGSETS */ |
58caa3dc | 5385 | |
1faeff08 | 5386 | #define use_linux_regsets 0 |
3aee8918 PA |
5387 | #define regsets_fetch_inferior_registers(regsets_info, regcache) 1 |
5388 | #define regsets_store_inferior_registers(regsets_info, regcache) 1 | |
58caa3dc | 5389 | |
58caa3dc | 5390 | #endif |
1faeff08 MR |
5391 | |
5392 | /* Return 1 if register REGNO is supported by one of the regset ptrace | |
5393 | calls or 0 if it has to be transferred individually. */ | |
5394 | ||
5395 | static int | |
3aee8918 | 5396 | linux_register_in_regsets (const struct regs_info *regs_info, int regno) |
1faeff08 MR |
5397 | { |
5398 | unsigned char mask = 1 << (regno % 8); | |
5399 | size_t index = regno / 8; | |
5400 | ||
5401 | return (use_linux_regsets | |
3aee8918 PA |
5402 | && (regs_info->regset_bitmap == NULL |
5403 | || (regs_info->regset_bitmap[index] & mask) != 0)); | |
1faeff08 MR |
5404 | } |
5405 | ||
58caa3dc | 5406 | #ifdef HAVE_LINUX_USRREGS |
1faeff08 | 5407 | |
5b3da067 | 5408 | static int |
3aee8918 | 5409 | register_addr (const struct usrregs_info *usrregs, int regnum) |
1faeff08 MR |
5410 | { |
5411 | int addr; | |
5412 | ||
3aee8918 | 5413 | if (regnum < 0 || regnum >= usrregs->num_regs) |
1faeff08 MR |
5414 | error ("Invalid register number %d.", regnum); |
5415 | ||
3aee8918 | 5416 | addr = usrregs->regmap[regnum]; |
1faeff08 MR |
5417 | |
5418 | return addr; | |
5419 | } | |
5420 | ||
5421 | /* Fetch one register. */ | |
5422 | static void | |
3aee8918 PA |
5423 | fetch_register (const struct usrregs_info *usrregs, |
5424 | struct regcache *regcache, int regno) | |
1faeff08 MR |
5425 | { |
5426 | CORE_ADDR regaddr; | |
5427 | int i, size; | |
5428 | char *buf; | |
5429 | int pid; | |
5430 | ||
3aee8918 | 5431 | if (regno >= usrregs->num_regs) |
1faeff08 MR |
5432 | return; |
5433 | if ((*the_low_target.cannot_fetch_register) (regno)) | |
5434 | return; | |
5435 | ||
3aee8918 | 5436 | regaddr = register_addr (usrregs, regno); |
1faeff08 MR |
5437 | if (regaddr == -1) |
5438 | return; | |
5439 | ||
3aee8918 PA |
5440 | size = ((register_size (regcache->tdesc, regno) |
5441 | + sizeof (PTRACE_XFER_TYPE) - 1) | |
1faeff08 | 5442 | & -sizeof (PTRACE_XFER_TYPE)); |
224c3ddb | 5443 | buf = (char *) alloca (size); |
1faeff08 | 5444 | |
0bfdf32f | 5445 | pid = lwpid_of (current_thread); |
1faeff08 MR |
5446 | for (i = 0; i < size; i += sizeof (PTRACE_XFER_TYPE)) |
5447 | { | |
5448 | errno = 0; | |
5449 | *(PTRACE_XFER_TYPE *) (buf + i) = | |
5450 | ptrace (PTRACE_PEEKUSER, pid, | |
5451 | /* Coerce to a uintptr_t first to avoid potential gcc warning | |
5452 | of coercing an 8 byte integer to a 4 byte pointer. */ | |
b8e1b30e | 5453 | (PTRACE_TYPE_ARG3) (uintptr_t) regaddr, (PTRACE_TYPE_ARG4) 0); |
1faeff08 MR |
5454 | regaddr += sizeof (PTRACE_XFER_TYPE); |
5455 | if (errno != 0) | |
9a70f35c YQ |
5456 | { |
5457 | /* Mark register REGNO unavailable. */ | |
5458 | supply_register (regcache, regno, NULL); | |
5459 | return; | |
5460 | } | |
1faeff08 MR |
5461 | } |
5462 | ||
5463 | if (the_low_target.supply_ptrace_register) | |
5464 | the_low_target.supply_ptrace_register (regcache, regno, buf); | |
5465 | else | |
5466 | supply_register (regcache, regno, buf); | |
5467 | } | |
5468 | ||
5469 | /* Store one register. */ | |
5470 | static void | |
3aee8918 PA |
5471 | store_register (const struct usrregs_info *usrregs, |
5472 | struct regcache *regcache, int regno) | |
1faeff08 MR |
5473 | { |
5474 | CORE_ADDR regaddr; | |
5475 | int i, size; | |
5476 | char *buf; | |
5477 | int pid; | |
5478 | ||
3aee8918 | 5479 | if (regno >= usrregs->num_regs) |
1faeff08 MR |
5480 | return; |
5481 | if ((*the_low_target.cannot_store_register) (regno)) | |
5482 | return; | |
5483 | ||
3aee8918 | 5484 | regaddr = register_addr (usrregs, regno); |
1faeff08 MR |
5485 | if (regaddr == -1) |
5486 | return; | |
5487 | ||
3aee8918 PA |
5488 | size = ((register_size (regcache->tdesc, regno) |
5489 | + sizeof (PTRACE_XFER_TYPE) - 1) | |
1faeff08 | 5490 | & -sizeof (PTRACE_XFER_TYPE)); |
224c3ddb | 5491 | buf = (char *) alloca (size); |
1faeff08 MR |
5492 | memset (buf, 0, size); |
5493 | ||
5494 | if (the_low_target.collect_ptrace_register) | |
5495 | the_low_target.collect_ptrace_register (regcache, regno, buf); | |
5496 | else | |
5497 | collect_register (regcache, regno, buf); | |
5498 | ||
0bfdf32f | 5499 | pid = lwpid_of (current_thread); |
1faeff08 MR |
5500 | for (i = 0; i < size; i += sizeof (PTRACE_XFER_TYPE)) |
5501 | { | |
5502 | errno = 0; | |
5503 | ptrace (PTRACE_POKEUSER, pid, | |
5504 | /* Coerce to a uintptr_t first to avoid potential gcc warning | |
5505 | about coercing an 8 byte integer to a 4 byte pointer. */ | |
b8e1b30e LM |
5506 | (PTRACE_TYPE_ARG3) (uintptr_t) regaddr, |
5507 | (PTRACE_TYPE_ARG4) *(PTRACE_XFER_TYPE *) (buf + i)); | |
1faeff08 MR |
5508 | if (errno != 0) |
5509 | { | |
5510 | /* At this point, ESRCH should mean the process is | |
5511 | already gone, in which case we simply ignore attempts | |
5512 | to change its registers. See also the related | |
5513 | comment in linux_resume_one_lwp. */ | |
5514 | if (errno == ESRCH) | |
5515 | return; | |
5516 | ||
5517 | if ((*the_low_target.cannot_store_register) (regno) == 0) | |
6d91ce9a | 5518 | error ("writing register %d: %s", regno, safe_strerror (errno)); |
1faeff08 MR |
5519 | } |
5520 | regaddr += sizeof (PTRACE_XFER_TYPE); | |
5521 | } | |
5522 | } | |
5523 | ||
5524 | /* Fetch all registers, or just one, from the child process. | |
5525 | If REGNO is -1, do this for all registers, skipping any that are | |
5526 | assumed to have been retrieved by regsets_fetch_inferior_registers, | |
5527 | unless ALL is non-zero. | |
5528 | Otherwise, REGNO specifies which register (so we can save time). */ | |
5529 | static void | |
3aee8918 PA |
5530 | usr_fetch_inferior_registers (const struct regs_info *regs_info, |
5531 | struct regcache *regcache, int regno, int all) | |
1faeff08 | 5532 | { |
3aee8918 PA |
5533 | struct usrregs_info *usr = regs_info->usrregs; |
5534 | ||
1faeff08 MR |
5535 | if (regno == -1) |
5536 | { | |
3aee8918 PA |
5537 | for (regno = 0; regno < usr->num_regs; regno++) |
5538 | if (all || !linux_register_in_regsets (regs_info, regno)) | |
5539 | fetch_register (usr, regcache, regno); | |
1faeff08 MR |
5540 | } |
5541 | else | |
3aee8918 | 5542 | fetch_register (usr, regcache, regno); |
1faeff08 MR |
5543 | } |
5544 | ||
5545 | /* Store our register values back into the inferior. | |
5546 | If REGNO is -1, do this for all registers, skipping any that are | |
5547 | assumed to have been saved by regsets_store_inferior_registers, | |
5548 | unless ALL is non-zero. | |
5549 | Otherwise, REGNO specifies which register (so we can save time). */ | |
5550 | static void | |
3aee8918 PA |
5551 | usr_store_inferior_registers (const struct regs_info *regs_info, |
5552 | struct regcache *regcache, int regno, int all) | |
1faeff08 | 5553 | { |
3aee8918 PA |
5554 | struct usrregs_info *usr = regs_info->usrregs; |
5555 | ||
1faeff08 MR |
5556 | if (regno == -1) |
5557 | { | |
3aee8918 PA |
5558 | for (regno = 0; regno < usr->num_regs; regno++) |
5559 | if (all || !linux_register_in_regsets (regs_info, regno)) | |
5560 | store_register (usr, regcache, regno); | |
1faeff08 MR |
5561 | } |
5562 | else | |
3aee8918 | 5563 | store_register (usr, regcache, regno); |
1faeff08 MR |
5564 | } |
5565 | ||
5566 | #else /* !HAVE_LINUX_USRREGS */ | |
5567 | ||
3aee8918 PA |
5568 | #define usr_fetch_inferior_registers(regs_info, regcache, regno, all) do {} while (0) |
5569 | #define usr_store_inferior_registers(regs_info, regcache, regno, all) do {} while (0) | |
1faeff08 | 5570 | |
58caa3dc | 5571 | #endif |
1faeff08 MR |
5572 | |
5573 | ||
a5a4d4cd TBA |
5574 | void |
5575 | linux_process_target::fetch_registers (regcache *regcache, int regno) | |
1faeff08 MR |
5576 | { |
5577 | int use_regsets; | |
5578 | int all = 0; | |
aa8d21c9 | 5579 | const regs_info *regs_info = get_regs_info (); |
1faeff08 MR |
5580 | |
5581 | if (regno == -1) | |
5582 | { | |
3aee8918 PA |
5583 | if (the_low_target.fetch_register != NULL |
5584 | && regs_info->usrregs != NULL) | |
5585 | for (regno = 0; regno < regs_info->usrregs->num_regs; regno++) | |
c14dfd32 PA |
5586 | (*the_low_target.fetch_register) (regcache, regno); |
5587 | ||
3aee8918 PA |
5588 | all = regsets_fetch_inferior_registers (regs_info->regsets_info, regcache); |
5589 | if (regs_info->usrregs != NULL) | |
5590 | usr_fetch_inferior_registers (regs_info, regcache, -1, all); | |
1faeff08 MR |
5591 | } |
5592 | else | |
5593 | { | |
c14dfd32 PA |
5594 | if (the_low_target.fetch_register != NULL |
5595 | && (*the_low_target.fetch_register) (regcache, regno)) | |
5596 | return; | |
5597 | ||
3aee8918 | 5598 | use_regsets = linux_register_in_regsets (regs_info, regno); |
1faeff08 | 5599 | if (use_regsets) |
3aee8918 PA |
5600 | all = regsets_fetch_inferior_registers (regs_info->regsets_info, |
5601 | regcache); | |
5602 | if ((!use_regsets || all) && regs_info->usrregs != NULL) | |
5603 | usr_fetch_inferior_registers (regs_info, regcache, regno, 1); | |
1faeff08 | 5604 | } |
58caa3dc DJ |
5605 | } |
5606 | ||
a5a4d4cd TBA |
5607 | void |
5608 | linux_process_target::store_registers (regcache *regcache, int regno) | |
58caa3dc | 5609 | { |
1faeff08 MR |
5610 | int use_regsets; |
5611 | int all = 0; | |
aa8d21c9 | 5612 | const regs_info *regs_info = get_regs_info (); |
1faeff08 MR |
5613 | |
5614 | if (regno == -1) | |
5615 | { | |
3aee8918 PA |
5616 | all = regsets_store_inferior_registers (regs_info->regsets_info, |
5617 | regcache); | |
5618 | if (regs_info->usrregs != NULL) | |
5619 | usr_store_inferior_registers (regs_info, regcache, regno, all); | |
1faeff08 MR |
5620 | } |
5621 | else | |
5622 | { | |
3aee8918 | 5623 | use_regsets = linux_register_in_regsets (regs_info, regno); |
1faeff08 | 5624 | if (use_regsets) |
3aee8918 PA |
5625 | all = regsets_store_inferior_registers (regs_info->regsets_info, |
5626 | regcache); | |
5627 | if ((!use_regsets || all) && regs_info->usrregs != NULL) | |
5628 | usr_store_inferior_registers (regs_info, regcache, regno, 1); | |
1faeff08 | 5629 | } |
58caa3dc DJ |
5630 | } |
5631 | ||
da6d8c04 | 5632 | |
e2558df3 | 5633 | /* A wrapper for the read_memory target op. */ |
da6d8c04 | 5634 | |
c3e735a6 | 5635 | static int |
f450004a | 5636 | linux_read_memory (CORE_ADDR memaddr, unsigned char *myaddr, int len) |
e2558df3 | 5637 | { |
52405d85 | 5638 | return the_target->read_memory (memaddr, myaddr, len); |
e2558df3 TBA |
5639 | } |
5640 | ||
5641 | /* Copy LEN bytes from inferior's memory starting at MEMADDR | |
5642 | to debugger memory starting at MYADDR. */ | |
5643 | ||
5644 | int | |
5645 | linux_process_target::read_memory (CORE_ADDR memaddr, | |
5646 | unsigned char *myaddr, int len) | |
da6d8c04 | 5647 | { |
0bfdf32f | 5648 | int pid = lwpid_of (current_thread); |
ae3e2ccf SM |
5649 | PTRACE_XFER_TYPE *buffer; |
5650 | CORE_ADDR addr; | |
5651 | int count; | |
4934b29e | 5652 | char filename[64]; |
ae3e2ccf | 5653 | int i; |
4934b29e | 5654 | int ret; |
fd462a61 | 5655 | int fd; |
fd462a61 DJ |
5656 | |
5657 | /* Try using /proc. Don't bother for one word. */ | |
5658 | if (len >= 3 * sizeof (long)) | |
5659 | { | |
4934b29e MR |
5660 | int bytes; |
5661 | ||
fd462a61 DJ |
5662 | /* We could keep this file open and cache it - possibly one per |
5663 | thread. That requires some juggling, but is even faster. */ | |
95954743 | 5664 | sprintf (filename, "/proc/%d/mem", pid); |
fd462a61 DJ |
5665 | fd = open (filename, O_RDONLY | O_LARGEFILE); |
5666 | if (fd == -1) | |
5667 | goto no_proc; | |
5668 | ||
5669 | /* If pread64 is available, use it. It's faster if the kernel | |
5670 | supports it (only one syscall), and it's 64-bit safe even on | |
5671 | 32-bit platforms (for instance, SPARC debugging a SPARC64 | |
5672 | application). */ | |
5673 | #ifdef HAVE_PREAD64 | |
4934b29e | 5674 | bytes = pread64 (fd, myaddr, len, memaddr); |
fd462a61 | 5675 | #else |
4934b29e MR |
5676 | bytes = -1; |
5677 | if (lseek (fd, memaddr, SEEK_SET) != -1) | |
5678 | bytes = read (fd, myaddr, len); | |
fd462a61 | 5679 | #endif |
fd462a61 DJ |
5680 | |
5681 | close (fd); | |
4934b29e MR |
5682 | if (bytes == len) |
5683 | return 0; | |
5684 | ||
5685 | /* Some data was read, we'll try to get the rest with ptrace. */ | |
5686 | if (bytes > 0) | |
5687 | { | |
5688 | memaddr += bytes; | |
5689 | myaddr += bytes; | |
5690 | len -= bytes; | |
5691 | } | |
fd462a61 | 5692 | } |
da6d8c04 | 5693 | |
fd462a61 | 5694 | no_proc: |
4934b29e MR |
5695 | /* Round starting address down to longword boundary. */ |
5696 | addr = memaddr & -(CORE_ADDR) sizeof (PTRACE_XFER_TYPE); | |
5697 | /* Round ending address up; get number of longwords that makes. */ | |
5698 | count = ((((memaddr + len) - addr) + sizeof (PTRACE_XFER_TYPE) - 1) | |
5699 | / sizeof (PTRACE_XFER_TYPE)); | |
5700 | /* Allocate buffer of that many longwords. */ | |
8d749320 | 5701 | buffer = XALLOCAVEC (PTRACE_XFER_TYPE, count); |
4934b29e | 5702 | |
da6d8c04 | 5703 | /* Read all the longwords */ |
4934b29e | 5704 | errno = 0; |
da6d8c04 DJ |
5705 | for (i = 0; i < count; i++, addr += sizeof (PTRACE_XFER_TYPE)) |
5706 | { | |
14ce3065 DE |
5707 | /* Coerce the 3rd arg to a uintptr_t first to avoid potential gcc warning |
5708 | about coercing an 8 byte integer to a 4 byte pointer. */ | |
5709 | buffer[i] = ptrace (PTRACE_PEEKTEXT, pid, | |
b8e1b30e LM |
5710 | (PTRACE_TYPE_ARG3) (uintptr_t) addr, |
5711 | (PTRACE_TYPE_ARG4) 0); | |
c3e735a6 | 5712 | if (errno) |
4934b29e | 5713 | break; |
da6d8c04 | 5714 | } |
4934b29e | 5715 | ret = errno; |
da6d8c04 DJ |
5716 | |
5717 | /* Copy appropriate bytes out of the buffer. */ | |
8d409d16 MR |
5718 | if (i > 0) |
5719 | { | |
5720 | i *= sizeof (PTRACE_XFER_TYPE); | |
5721 | i -= memaddr & (sizeof (PTRACE_XFER_TYPE) - 1); | |
5722 | memcpy (myaddr, | |
5723 | (char *) buffer + (memaddr & (sizeof (PTRACE_XFER_TYPE) - 1)), | |
5724 | i < len ? i : len); | |
5725 | } | |
c3e735a6 | 5726 | |
4934b29e | 5727 | return ret; |
da6d8c04 DJ |
5728 | } |
5729 | ||
93ae6fdc PA |
5730 | /* Copy LEN bytes of data from debugger memory at MYADDR to inferior's |
5731 | memory at MEMADDR. On failure (cannot write to the inferior) | |
f0ae6fc3 | 5732 | returns the value of errno. Always succeeds if LEN is zero. */ |
da6d8c04 | 5733 | |
e2558df3 TBA |
5734 | int |
5735 | linux_process_target::write_memory (CORE_ADDR memaddr, | |
5736 | const unsigned char *myaddr, int len) | |
da6d8c04 | 5737 | { |
ae3e2ccf | 5738 | int i; |
da6d8c04 | 5739 | /* Round starting address down to longword boundary. */ |
ae3e2ccf | 5740 | CORE_ADDR addr = memaddr & -(CORE_ADDR) sizeof (PTRACE_XFER_TYPE); |
da6d8c04 | 5741 | /* Round ending address up; get number of longwords that makes. */ |
ae3e2ccf | 5742 | int count |
493e2a69 MS |
5743 | = (((memaddr + len) - addr) + sizeof (PTRACE_XFER_TYPE) - 1) |
5744 | / sizeof (PTRACE_XFER_TYPE); | |
5745 | ||
da6d8c04 | 5746 | /* Allocate buffer of that many longwords. */ |
ae3e2ccf | 5747 | PTRACE_XFER_TYPE *buffer = XALLOCAVEC (PTRACE_XFER_TYPE, count); |
493e2a69 | 5748 | |
0bfdf32f | 5749 | int pid = lwpid_of (current_thread); |
da6d8c04 | 5750 | |
f0ae6fc3 PA |
5751 | if (len == 0) |
5752 | { | |
5753 | /* Zero length write always succeeds. */ | |
5754 | return 0; | |
5755 | } | |
5756 | ||
0d62e5e8 DJ |
5757 | if (debug_threads) |
5758 | { | |
58d6951d | 5759 | /* Dump up to four bytes. */ |
bf47e248 PA |
5760 | char str[4 * 2 + 1]; |
5761 | char *p = str; | |
5762 | int dump = len < 4 ? len : 4; | |
5763 | ||
5764 | for (i = 0; i < dump; i++) | |
5765 | { | |
5766 | sprintf (p, "%02x", myaddr[i]); | |
5767 | p += 2; | |
5768 | } | |
5769 | *p = '\0'; | |
5770 | ||
5771 | debug_printf ("Writing %s to 0x%08lx in process %d\n", | |
5772 | str, (long) memaddr, pid); | |
0d62e5e8 DJ |
5773 | } |
5774 | ||
da6d8c04 DJ |
5775 | /* Fill start and end extra bytes of buffer with existing memory data. */ |
5776 | ||
93ae6fdc | 5777 | errno = 0; |
14ce3065 DE |
5778 | /* Coerce the 3rd arg to a uintptr_t first to avoid potential gcc warning |
5779 | about coercing an 8 byte integer to a 4 byte pointer. */ | |
5780 | buffer[0] = ptrace (PTRACE_PEEKTEXT, pid, | |
b8e1b30e LM |
5781 | (PTRACE_TYPE_ARG3) (uintptr_t) addr, |
5782 | (PTRACE_TYPE_ARG4) 0); | |
93ae6fdc PA |
5783 | if (errno) |
5784 | return errno; | |
da6d8c04 DJ |
5785 | |
5786 | if (count > 1) | |
5787 | { | |
93ae6fdc | 5788 | errno = 0; |
da6d8c04 | 5789 | buffer[count - 1] |
95954743 | 5790 | = ptrace (PTRACE_PEEKTEXT, pid, |
14ce3065 DE |
5791 | /* Coerce to a uintptr_t first to avoid potential gcc warning |
5792 | about coercing an 8 byte integer to a 4 byte pointer. */ | |
b8e1b30e | 5793 | (PTRACE_TYPE_ARG3) (uintptr_t) (addr + (count - 1) |
14ce3065 | 5794 | * sizeof (PTRACE_XFER_TYPE)), |
b8e1b30e | 5795 | (PTRACE_TYPE_ARG4) 0); |
93ae6fdc PA |
5796 | if (errno) |
5797 | return errno; | |
da6d8c04 DJ |
5798 | } |
5799 | ||
93ae6fdc | 5800 | /* Copy data to be written over corresponding part of buffer. */ |
da6d8c04 | 5801 | |
493e2a69 MS |
5802 | memcpy ((char *) buffer + (memaddr & (sizeof (PTRACE_XFER_TYPE) - 1)), |
5803 | myaddr, len); | |
da6d8c04 DJ |
5804 | |
5805 | /* Write the entire buffer. */ | |
5806 | ||
5807 | for (i = 0; i < count; i++, addr += sizeof (PTRACE_XFER_TYPE)) | |
5808 | { | |
5809 | errno = 0; | |
14ce3065 DE |
5810 | ptrace (PTRACE_POKETEXT, pid, |
5811 | /* Coerce to a uintptr_t first to avoid potential gcc warning | |
5812 | about coercing an 8 byte integer to a 4 byte pointer. */ | |
b8e1b30e LM |
5813 | (PTRACE_TYPE_ARG3) (uintptr_t) addr, |
5814 | (PTRACE_TYPE_ARG4) buffer[i]); | |
da6d8c04 DJ |
5815 | if (errno) |
5816 | return errno; | |
5817 | } | |
5818 | ||
5819 | return 0; | |
5820 | } | |
2f2893d9 | 5821 | |
2a31c7aa TBA |
5822 | void |
5823 | linux_process_target::look_up_symbols () | |
2f2893d9 | 5824 | { |
0d62e5e8 | 5825 | #ifdef USE_THREAD_DB |
95954743 PA |
5826 | struct process_info *proc = current_process (); |
5827 | ||
fe978cb0 | 5828 | if (proc->priv->thread_db != NULL) |
0d62e5e8 DJ |
5829 | return; |
5830 | ||
9b4c5f87 | 5831 | thread_db_init (); |
0d62e5e8 DJ |
5832 | #endif |
5833 | } | |
5834 | ||
eb497a2a TBA |
5835 | void |
5836 | linux_process_target::request_interrupt () | |
e5379b03 | 5837 | { |
78708b7c PA |
5838 | /* Send a SIGINT to the process group. This acts just like the user |
5839 | typed a ^C on the controlling terminal. */ | |
eb497a2a | 5840 | ::kill (-signal_pid, SIGINT); |
e5379b03 DJ |
5841 | } |
5842 | ||
eac215cc TBA |
5843 | bool |
5844 | linux_process_target::supports_read_auxv () | |
5845 | { | |
5846 | return true; | |
5847 | } | |
5848 | ||
aa691b87 RM |
5849 | /* Copy LEN bytes from inferior's auxiliary vector starting at OFFSET |
5850 | to debugger memory starting at MYADDR. */ | |
5851 | ||
eac215cc TBA |
5852 | int |
5853 | linux_process_target::read_auxv (CORE_ADDR offset, unsigned char *myaddr, | |
5854 | unsigned int len) | |
aa691b87 RM |
5855 | { |
5856 | char filename[PATH_MAX]; | |
5857 | int fd, n; | |
0bfdf32f | 5858 | int pid = lwpid_of (current_thread); |
aa691b87 | 5859 | |
6cebaf6e | 5860 | xsnprintf (filename, sizeof filename, "/proc/%d/auxv", pid); |
aa691b87 RM |
5861 | |
5862 | fd = open (filename, O_RDONLY); | |
5863 | if (fd < 0) | |
5864 | return -1; | |
5865 | ||
5866 | if (offset != (CORE_ADDR) 0 | |
5867 | && lseek (fd, (off_t) offset, SEEK_SET) != (off_t) offset) | |
5868 | n = -1; | |
5869 | else | |
5870 | n = read (fd, myaddr, len); | |
5871 | ||
5872 | close (fd); | |
5873 | ||
5874 | return n; | |
5875 | } | |
5876 | ||
d993e290 PA |
5877 | /* These breakpoint and watchpoint related wrapper functions simply |
5878 | pass on the function call if the target has registered a | |
5879 | corresponding function. */ | |
e013ee27 | 5880 | |
a2b2297a TBA |
5881 | bool |
5882 | linux_process_target::supports_z_point_type (char z_type) | |
802e8e6d PA |
5883 | { |
5884 | return (the_low_target.supports_z_point_type != NULL | |
5885 | && the_low_target.supports_z_point_type (z_type)); | |
5886 | } | |
5887 | ||
7e0bde70 TBA |
5888 | int |
5889 | linux_process_target::insert_point (enum raw_bkpt_type type, CORE_ADDR addr, | |
5890 | int size, raw_breakpoint *bp) | |
e013ee27 | 5891 | { |
c8f4bfdd YQ |
5892 | if (type == raw_bkpt_type_sw) |
5893 | return insert_memory_breakpoint (bp); | |
5894 | else if (the_low_target.insert_point != NULL) | |
802e8e6d | 5895 | return the_low_target.insert_point (type, addr, size, bp); |
e013ee27 OF |
5896 | else |
5897 | /* Unsupported (see target.h). */ | |
5898 | return 1; | |
5899 | } | |
5900 | ||
7e0bde70 TBA |
5901 | int |
5902 | linux_process_target::remove_point (enum raw_bkpt_type type, CORE_ADDR addr, | |
5903 | int size, raw_breakpoint *bp) | |
e013ee27 | 5904 | { |
c8f4bfdd YQ |
5905 | if (type == raw_bkpt_type_sw) |
5906 | return remove_memory_breakpoint (bp); | |
5907 | else if (the_low_target.remove_point != NULL) | |
802e8e6d | 5908 | return the_low_target.remove_point (type, addr, size, bp); |
e013ee27 OF |
5909 | else |
5910 | /* Unsupported (see target.h). */ | |
5911 | return 1; | |
5912 | } | |
5913 | ||
84320c4e | 5914 | /* Implement the stopped_by_sw_breakpoint target_ops |
3e572f71 PA |
5915 | method. */ |
5916 | ||
84320c4e TBA |
5917 | bool |
5918 | linux_process_target::stopped_by_sw_breakpoint () | |
3e572f71 PA |
5919 | { |
5920 | struct lwp_info *lwp = get_thread_lwp (current_thread); | |
5921 | ||
5922 | return (lwp->stop_reason == TARGET_STOPPED_BY_SW_BREAKPOINT); | |
5923 | } | |
5924 | ||
84320c4e | 5925 | /* Implement the supports_stopped_by_sw_breakpoint target_ops |
3e572f71 PA |
5926 | method. */ |
5927 | ||
84320c4e TBA |
5928 | bool |
5929 | linux_process_target::supports_stopped_by_sw_breakpoint () | |
3e572f71 PA |
5930 | { |
5931 | return USE_SIGTRAP_SIGINFO; | |
5932 | } | |
5933 | ||
93fe88b2 | 5934 | /* Implement the stopped_by_hw_breakpoint target_ops |
3e572f71 PA |
5935 | method. */ |
5936 | ||
93fe88b2 TBA |
5937 | bool |
5938 | linux_process_target::stopped_by_hw_breakpoint () | |
3e572f71 PA |
5939 | { |
5940 | struct lwp_info *lwp = get_thread_lwp (current_thread); | |
5941 | ||
5942 | return (lwp->stop_reason == TARGET_STOPPED_BY_HW_BREAKPOINT); | |
5943 | } | |
5944 | ||
93fe88b2 | 5945 | /* Implement the supports_stopped_by_hw_breakpoint target_ops |
3e572f71 PA |
5946 | method. */ |
5947 | ||
93fe88b2 TBA |
5948 | bool |
5949 | linux_process_target::supports_stopped_by_hw_breakpoint () | |
3e572f71 PA |
5950 | { |
5951 | return USE_SIGTRAP_SIGINFO; | |
5952 | } | |
5953 | ||
70b90b91 | 5954 | /* Implement the supports_hardware_single_step target_ops method. */ |
45614f15 | 5955 | |
22aa6223 TBA |
5956 | bool |
5957 | linux_process_target::supports_hardware_single_step () | |
45614f15 | 5958 | { |
45614f15 YQ |
5959 | return can_hardware_single_step (); |
5960 | } | |
5961 | ||
5303a34f TBA |
5962 | bool |
5963 | linux_process_target::supports_software_single_step () | |
7d00775e AT |
5964 | { |
5965 | return can_software_single_step (); | |
5966 | } | |
5967 | ||
6eeb5c55 TBA |
5968 | bool |
5969 | linux_process_target::stopped_by_watchpoint () | |
e013ee27 | 5970 | { |
0bfdf32f | 5971 | struct lwp_info *lwp = get_thread_lwp (current_thread); |
c3adc08c | 5972 | |
15c66dd6 | 5973 | return lwp->stop_reason == TARGET_STOPPED_BY_WATCHPOINT; |
e013ee27 OF |
5974 | } |
5975 | ||
6eeb5c55 TBA |
5976 | CORE_ADDR |
5977 | linux_process_target::stopped_data_address () | |
e013ee27 | 5978 | { |
0bfdf32f | 5979 | struct lwp_info *lwp = get_thread_lwp (current_thread); |
c3adc08c PA |
5980 | |
5981 | return lwp->stopped_data_address; | |
e013ee27 OF |
5982 | } |
5983 | ||
db0dfaa0 LM |
5984 | /* This is only used for targets that define PT_TEXT_ADDR, |
5985 | PT_DATA_ADDR and PT_TEXT_END_ADDR. If those are not defined, supposedly | |
5986 | the target has different ways of acquiring this information, like | |
5987 | loadmaps. */ | |
52fb6437 | 5988 | |
5203ae1e TBA |
5989 | bool |
5990 | linux_process_target::supports_read_offsets () | |
5991 | { | |
5992 | #ifdef SUPPORTS_READ_OFFSETS | |
5993 | return true; | |
5994 | #else | |
5995 | return false; | |
5996 | #endif | |
5997 | } | |
5998 | ||
52fb6437 NS |
5999 | /* Under uClinux, programs are loaded at non-zero offsets, which we need |
6000 | to tell gdb about. */ | |
6001 | ||
5203ae1e TBA |
6002 | int |
6003 | linux_process_target::read_offsets (CORE_ADDR *text_p, CORE_ADDR *data_p) | |
52fb6437 | 6004 | { |
5203ae1e | 6005 | #ifdef SUPPORTS_READ_OFFSETS |
52fb6437 | 6006 | unsigned long text, text_end, data; |
62828379 | 6007 | int pid = lwpid_of (current_thread); |
52fb6437 NS |
6008 | |
6009 | errno = 0; | |
6010 | ||
b8e1b30e LM |
6011 | text = ptrace (PTRACE_PEEKUSER, pid, (PTRACE_TYPE_ARG3) PT_TEXT_ADDR, |
6012 | (PTRACE_TYPE_ARG4) 0); | |
6013 | text_end = ptrace (PTRACE_PEEKUSER, pid, (PTRACE_TYPE_ARG3) PT_TEXT_END_ADDR, | |
6014 | (PTRACE_TYPE_ARG4) 0); | |
6015 | data = ptrace (PTRACE_PEEKUSER, pid, (PTRACE_TYPE_ARG3) PT_DATA_ADDR, | |
6016 | (PTRACE_TYPE_ARG4) 0); | |
52fb6437 NS |
6017 | |
6018 | if (errno == 0) | |
6019 | { | |
6020 | /* Both text and data offsets produced at compile-time (and so | |
1b3f6016 PA |
6021 | used by gdb) are relative to the beginning of the program, |
6022 | with the data segment immediately following the text segment. | |
6023 | However, the actual runtime layout in memory may put the data | |
6024 | somewhere else, so when we send gdb a data base-address, we | |
6025 | use the real data base address and subtract the compile-time | |
6026 | data base-address from it (which is just the length of the | |
6027 | text segment). BSS immediately follows data in both | |
6028 | cases. */ | |
52fb6437 NS |
6029 | *text_p = text; |
6030 | *data_p = data - (text_end - text); | |
1b3f6016 | 6031 | |
52fb6437 NS |
6032 | return 1; |
6033 | } | |
5203ae1e TBA |
6034 | return 0; |
6035 | #else | |
6036 | gdb_assert_not_reached ("target op read_offsets not supported"); | |
52fb6437 | 6037 | #endif |
5203ae1e | 6038 | } |
52fb6437 | 6039 | |
6e3fd7e9 TBA |
6040 | bool |
6041 | linux_process_target::supports_get_tls_address () | |
6042 | { | |
6043 | #ifdef USE_THREAD_DB | |
6044 | return true; | |
6045 | #else | |
6046 | return false; | |
6047 | #endif | |
6048 | } | |
6049 | ||
6050 | int | |
6051 | linux_process_target::get_tls_address (thread_info *thread, | |
6052 | CORE_ADDR offset, | |
6053 | CORE_ADDR load_module, | |
6054 | CORE_ADDR *address) | |
6055 | { | |
6056 | #ifdef USE_THREAD_DB | |
6057 | return thread_db_get_tls_address (thread, offset, load_module, address); | |
6058 | #else | |
6059 | return -1; | |
6060 | #endif | |
6061 | } | |
6062 | ||
2d0795ee TBA |
6063 | bool |
6064 | linux_process_target::supports_qxfer_osdata () | |
6065 | { | |
6066 | return true; | |
6067 | } | |
6068 | ||
6069 | int | |
6070 | linux_process_target::qxfer_osdata (const char *annex, | |
6071 | unsigned char *readbuf, | |
6072 | unsigned const char *writebuf, | |
6073 | CORE_ADDR offset, int len) | |
07e059b5 | 6074 | { |
d26e3629 | 6075 | return linux_common_xfer_osdata (annex, readbuf, offset, len); |
07e059b5 VP |
6076 | } |
6077 | ||
d0722149 DE |
6078 | /* Convert a native/host siginfo object, into/from the siginfo in the |
6079 | layout of the inferiors' architecture. */ | |
6080 | ||
6081 | static void | |
8adce034 | 6082 | siginfo_fixup (siginfo_t *siginfo, gdb_byte *inf_siginfo, int direction) |
d0722149 DE |
6083 | { |
6084 | int done = 0; | |
6085 | ||
6086 | if (the_low_target.siginfo_fixup != NULL) | |
6087 | done = the_low_target.siginfo_fixup (siginfo, inf_siginfo, direction); | |
6088 | ||
6089 | /* If there was no callback, or the callback didn't do anything, | |
6090 | then just do a straight memcpy. */ | |
6091 | if (!done) | |
6092 | { | |
6093 | if (direction == 1) | |
a5362b9a | 6094 | memcpy (siginfo, inf_siginfo, sizeof (siginfo_t)); |
d0722149 | 6095 | else |
a5362b9a | 6096 | memcpy (inf_siginfo, siginfo, sizeof (siginfo_t)); |
d0722149 DE |
6097 | } |
6098 | } | |
6099 | ||
d7abedf7 TBA |
6100 | bool |
6101 | linux_process_target::supports_qxfer_siginfo () | |
6102 | { | |
6103 | return true; | |
6104 | } | |
6105 | ||
6106 | int | |
6107 | linux_process_target::qxfer_siginfo (const char *annex, | |
6108 | unsigned char *readbuf, | |
6109 | unsigned const char *writebuf, | |
6110 | CORE_ADDR offset, int len) | |
4aa995e1 | 6111 | { |
d0722149 | 6112 | int pid; |
a5362b9a | 6113 | siginfo_t siginfo; |
8adce034 | 6114 | gdb_byte inf_siginfo[sizeof (siginfo_t)]; |
4aa995e1 | 6115 | |
0bfdf32f | 6116 | if (current_thread == NULL) |
4aa995e1 PA |
6117 | return -1; |
6118 | ||
0bfdf32f | 6119 | pid = lwpid_of (current_thread); |
4aa995e1 PA |
6120 | |
6121 | if (debug_threads) | |
87ce2a04 DE |
6122 | debug_printf ("%s siginfo for lwp %d.\n", |
6123 | readbuf != NULL ? "Reading" : "Writing", | |
6124 | pid); | |
4aa995e1 | 6125 | |
0adea5f7 | 6126 | if (offset >= sizeof (siginfo)) |
4aa995e1 PA |
6127 | return -1; |
6128 | ||
b8e1b30e | 6129 | if (ptrace (PTRACE_GETSIGINFO, pid, (PTRACE_TYPE_ARG3) 0, &siginfo) != 0) |
4aa995e1 PA |
6130 | return -1; |
6131 | ||
d0722149 DE |
6132 | /* When GDBSERVER is built as a 64-bit application, ptrace writes into |
6133 | SIGINFO an object with 64-bit layout. Since debugging a 32-bit | |
6134 | inferior with a 64-bit GDBSERVER should look the same as debugging it | |
6135 | with a 32-bit GDBSERVER, we need to convert it. */ | |
6136 | siginfo_fixup (&siginfo, inf_siginfo, 0); | |
6137 | ||
4aa995e1 PA |
6138 | if (offset + len > sizeof (siginfo)) |
6139 | len = sizeof (siginfo) - offset; | |
6140 | ||
6141 | if (readbuf != NULL) | |
d0722149 | 6142 | memcpy (readbuf, inf_siginfo + offset, len); |
4aa995e1 PA |
6143 | else |
6144 | { | |
d0722149 DE |
6145 | memcpy (inf_siginfo + offset, writebuf, len); |
6146 | ||
6147 | /* Convert back to ptrace layout before flushing it out. */ | |
6148 | siginfo_fixup (&siginfo, inf_siginfo, 1); | |
6149 | ||
b8e1b30e | 6150 | if (ptrace (PTRACE_SETSIGINFO, pid, (PTRACE_TYPE_ARG3) 0, &siginfo) != 0) |
4aa995e1 PA |
6151 | return -1; |
6152 | } | |
6153 | ||
6154 | return len; | |
6155 | } | |
6156 | ||
bd99dc85 PA |
6157 | /* SIGCHLD handler that serves two purposes: In non-stop/async mode, |
6158 | so we notice when children change state; as the handler for the | |
6159 | sigsuspend in my_waitpid. */ | |
6160 | ||
6161 | static void | |
6162 | sigchld_handler (int signo) | |
6163 | { | |
6164 | int old_errno = errno; | |
6165 | ||
6166 | if (debug_threads) | |
e581f2b4 PA |
6167 | { |
6168 | do | |
6169 | { | |
a7e559cc AH |
6170 | /* Use the async signal safe debug function. */ |
6171 | if (debug_write ("sigchld_handler\n", | |
6172 | sizeof ("sigchld_handler\n") - 1) < 0) | |
e581f2b4 PA |
6173 | break; /* just ignore */ |
6174 | } while (0); | |
6175 | } | |
bd99dc85 PA |
6176 | |
6177 | if (target_is_async_p ()) | |
6178 | async_file_mark (); /* trigger a linux_wait */ | |
6179 | ||
6180 | errno = old_errno; | |
6181 | } | |
6182 | ||
0dc587d4 TBA |
6183 | bool |
6184 | linux_process_target::supports_non_stop () | |
bd99dc85 | 6185 | { |
0dc587d4 | 6186 | return true; |
bd99dc85 PA |
6187 | } |
6188 | ||
0dc587d4 TBA |
6189 | bool |
6190 | linux_process_target::async (bool enable) | |
bd99dc85 | 6191 | { |
0dc587d4 | 6192 | bool previous = target_is_async_p (); |
bd99dc85 | 6193 | |
8336d594 | 6194 | if (debug_threads) |
87ce2a04 DE |
6195 | debug_printf ("linux_async (%d), previous=%d\n", |
6196 | enable, previous); | |
8336d594 | 6197 | |
bd99dc85 PA |
6198 | if (previous != enable) |
6199 | { | |
6200 | sigset_t mask; | |
6201 | sigemptyset (&mask); | |
6202 | sigaddset (&mask, SIGCHLD); | |
6203 | ||
21987b9c | 6204 | gdb_sigmask (SIG_BLOCK, &mask, NULL); |
bd99dc85 PA |
6205 | |
6206 | if (enable) | |
6207 | { | |
6208 | if (pipe (linux_event_pipe) == -1) | |
aa96c426 GB |
6209 | { |
6210 | linux_event_pipe[0] = -1; | |
6211 | linux_event_pipe[1] = -1; | |
21987b9c | 6212 | gdb_sigmask (SIG_UNBLOCK, &mask, NULL); |
aa96c426 GB |
6213 | |
6214 | warning ("creating event pipe failed."); | |
6215 | return previous; | |
6216 | } | |
bd99dc85 PA |
6217 | |
6218 | fcntl (linux_event_pipe[0], F_SETFL, O_NONBLOCK); | |
6219 | fcntl (linux_event_pipe[1], F_SETFL, O_NONBLOCK); | |
6220 | ||
6221 | /* Register the event loop handler. */ | |
6222 | add_file_handler (linux_event_pipe[0], | |
6223 | handle_target_event, NULL); | |
6224 | ||
6225 | /* Always trigger a linux_wait. */ | |
6226 | async_file_mark (); | |
6227 | } | |
6228 | else | |
6229 | { | |
6230 | delete_file_handler (linux_event_pipe[0]); | |
6231 | ||
6232 | close (linux_event_pipe[0]); | |
6233 | close (linux_event_pipe[1]); | |
6234 | linux_event_pipe[0] = -1; | |
6235 | linux_event_pipe[1] = -1; | |
6236 | } | |
6237 | ||
21987b9c | 6238 | gdb_sigmask (SIG_UNBLOCK, &mask, NULL); |
bd99dc85 PA |
6239 | } |
6240 | ||
6241 | return previous; | |
6242 | } | |
6243 | ||
0dc587d4 TBA |
6244 | int |
6245 | linux_process_target::start_non_stop (bool nonstop) | |
bd99dc85 PA |
6246 | { |
6247 | /* Register or unregister from event-loop accordingly. */ | |
0dc587d4 | 6248 | target_async (nonstop); |
aa96c426 | 6249 | |
0dc587d4 | 6250 | if (target_is_async_p () != (nonstop != false)) |
aa96c426 GB |
6251 | return -1; |
6252 | ||
bd99dc85 PA |
6253 | return 0; |
6254 | } | |
6255 | ||
652aef77 TBA |
6256 | bool |
6257 | linux_process_target::supports_multi_process () | |
cf8fd78b | 6258 | { |
652aef77 | 6259 | return true; |
cf8fd78b PA |
6260 | } |
6261 | ||
89245bc0 DB |
6262 | /* Check if fork events are supported. */ |
6263 | ||
9690a72a TBA |
6264 | bool |
6265 | linux_process_target::supports_fork_events () | |
89245bc0 DB |
6266 | { |
6267 | return linux_supports_tracefork (); | |
6268 | } | |
6269 | ||
6270 | /* Check if vfork events are supported. */ | |
6271 | ||
9690a72a TBA |
6272 | bool |
6273 | linux_process_target::supports_vfork_events () | |
89245bc0 DB |
6274 | { |
6275 | return linux_supports_tracefork (); | |
6276 | } | |
6277 | ||
94585166 DB |
6278 | /* Check if exec events are supported. */ |
6279 | ||
9690a72a TBA |
6280 | bool |
6281 | linux_process_target::supports_exec_events () | |
94585166 DB |
6282 | { |
6283 | return linux_supports_traceexec (); | |
6284 | } | |
6285 | ||
de0d863e DB |
6286 | /* Target hook for 'handle_new_gdb_connection'. Causes a reset of the |
6287 | ptrace flags for all inferiors. This is in case the new GDB connection | |
6288 | doesn't support the same set of events that the previous one did. */ | |
6289 | ||
fb00dfce TBA |
6290 | void |
6291 | linux_process_target::handle_new_gdb_connection () | |
de0d863e | 6292 | { |
de0d863e | 6293 | /* Request that all the lwps reset their ptrace options. */ |
bbf550d5 SM |
6294 | for_each_thread ([] (thread_info *thread) |
6295 | { | |
6296 | struct lwp_info *lwp = get_thread_lwp (thread); | |
6297 | ||
6298 | if (!lwp->stopped) | |
6299 | { | |
6300 | /* Stop the lwp so we can modify its ptrace options. */ | |
6301 | lwp->must_set_ptrace_flags = 1; | |
6302 | linux_stop_lwp (lwp); | |
6303 | } | |
6304 | else | |
6305 | { | |
6306 | /* Already stopped; go ahead and set the ptrace options. */ | |
6307 | struct process_info *proc = find_process_pid (pid_of (thread)); | |
6308 | int options = linux_low_ptrace_options (proc->attached); | |
6309 | ||
6310 | linux_enable_event_reporting (lwpid_of (thread), options); | |
6311 | lwp->must_set_ptrace_flags = 0; | |
6312 | } | |
6313 | }); | |
de0d863e DB |
6314 | } |
6315 | ||
55cf3021 TBA |
6316 | int |
6317 | linux_process_target::handle_monitor_command (char *mon) | |
6318 | { | |
6319 | #ifdef USE_THREAD_DB | |
6320 | return thread_db_handle_monitor_command (mon); | |
6321 | #else | |
6322 | return 0; | |
6323 | #endif | |
6324 | } | |
6325 | ||
95a45fc1 TBA |
6326 | int |
6327 | linux_process_target::core_of_thread (ptid_t ptid) | |
6328 | { | |
6329 | return linux_common_core_of_thread (ptid); | |
6330 | } | |
6331 | ||
c756403b TBA |
6332 | bool |
6333 | linux_process_target::supports_disable_randomization () | |
03583c20 UW |
6334 | { |
6335 | #ifdef HAVE_PERSONALITY | |
c756403b | 6336 | return true; |
03583c20 | 6337 | #else |
c756403b | 6338 | return false; |
03583c20 UW |
6339 | #endif |
6340 | } | |
efcbbd14 | 6341 | |
c0245cb9 TBA |
6342 | bool |
6343 | linux_process_target::supports_agent () | |
d1feda86 | 6344 | { |
c0245cb9 | 6345 | return true; |
d1feda86 YQ |
6346 | } |
6347 | ||
2526e0cd TBA |
6348 | bool |
6349 | linux_process_target::supports_range_stepping () | |
c2d6af84 | 6350 | { |
c3805894 | 6351 | if (can_software_single_step ()) |
2526e0cd | 6352 | return true; |
c2d6af84 | 6353 | if (*the_low_target.supports_range_stepping == NULL) |
2526e0cd | 6354 | return false; |
c2d6af84 PA |
6355 | |
6356 | return (*the_low_target.supports_range_stepping) (); | |
6357 | } | |
6358 | ||
8247b823 TBA |
6359 | bool |
6360 | linux_process_target::supports_pid_to_exec_file () | |
6361 | { | |
6362 | return true; | |
6363 | } | |
6364 | ||
6365 | char * | |
6366 | linux_process_target::pid_to_exec_file (int pid) | |
6367 | { | |
6368 | return linux_proc_pid_to_exec_file (pid); | |
6369 | } | |
6370 | ||
c9b7b804 TBA |
6371 | bool |
6372 | linux_process_target::supports_multifs () | |
6373 | { | |
6374 | return true; | |
6375 | } | |
6376 | ||
6377 | int | |
6378 | linux_process_target::multifs_open (int pid, const char *filename, | |
6379 | int flags, mode_t mode) | |
6380 | { | |
6381 | return linux_mntns_open_cloexec (pid, filename, flags, mode); | |
6382 | } | |
6383 | ||
6384 | int | |
6385 | linux_process_target::multifs_unlink (int pid, const char *filename) | |
6386 | { | |
6387 | return linux_mntns_unlink (pid, filename); | |
6388 | } | |
6389 | ||
6390 | ssize_t | |
6391 | linux_process_target::multifs_readlink (int pid, const char *filename, | |
6392 | char *buf, size_t bufsiz) | |
6393 | { | |
6394 | return linux_mntns_readlink (pid, filename, buf, bufsiz); | |
6395 | } | |
6396 | ||
723b724b | 6397 | #if defined PT_GETDSBT || defined PTRACE_GETFDPIC |
78d85199 YQ |
6398 | struct target_loadseg |
6399 | { | |
6400 | /* Core address to which the segment is mapped. */ | |
6401 | Elf32_Addr addr; | |
6402 | /* VMA recorded in the program header. */ | |
6403 | Elf32_Addr p_vaddr; | |
6404 | /* Size of this segment in memory. */ | |
6405 | Elf32_Word p_memsz; | |
6406 | }; | |
6407 | ||
723b724b | 6408 | # if defined PT_GETDSBT |
78d85199 YQ |
6409 | struct target_loadmap |
6410 | { | |
6411 | /* Protocol version number, must be zero. */ | |
6412 | Elf32_Word version; | |
6413 | /* Pointer to the DSBT table, its size, and the DSBT index. */ | |
6414 | unsigned *dsbt_table; | |
6415 | unsigned dsbt_size, dsbt_index; | |
6416 | /* Number of segments in this map. */ | |
6417 | Elf32_Word nsegs; | |
6418 | /* The actual memory map. */ | |
6419 | struct target_loadseg segs[/*nsegs*/]; | |
6420 | }; | |
723b724b MF |
6421 | # define LINUX_LOADMAP PT_GETDSBT |
6422 | # define LINUX_LOADMAP_EXEC PTRACE_GETDSBT_EXEC | |
6423 | # define LINUX_LOADMAP_INTERP PTRACE_GETDSBT_INTERP | |
6424 | # else | |
6425 | struct target_loadmap | |
6426 | { | |
6427 | /* Protocol version number, must be zero. */ | |
6428 | Elf32_Half version; | |
6429 | /* Number of segments in this map. */ | |
6430 | Elf32_Half nsegs; | |
6431 | /* The actual memory map. */ | |
6432 | struct target_loadseg segs[/*nsegs*/]; | |
6433 | }; | |
6434 | # define LINUX_LOADMAP PTRACE_GETFDPIC | |
6435 | # define LINUX_LOADMAP_EXEC PTRACE_GETFDPIC_EXEC | |
6436 | # define LINUX_LOADMAP_INTERP PTRACE_GETFDPIC_INTERP | |
6437 | # endif | |
78d85199 | 6438 | |
9da41fda TBA |
6439 | bool |
6440 | linux_process_target::supports_read_loadmap () | |
6441 | { | |
6442 | return true; | |
6443 | } | |
6444 | ||
6445 | int | |
6446 | linux_process_target::read_loadmap (const char *annex, CORE_ADDR offset, | |
6447 | unsigned char *myaddr, unsigned int len) | |
78d85199 | 6448 | { |
0bfdf32f | 6449 | int pid = lwpid_of (current_thread); |
78d85199 YQ |
6450 | int addr = -1; |
6451 | struct target_loadmap *data = NULL; | |
6452 | unsigned int actual_length, copy_length; | |
6453 | ||
6454 | if (strcmp (annex, "exec") == 0) | |
723b724b | 6455 | addr = (int) LINUX_LOADMAP_EXEC; |
78d85199 | 6456 | else if (strcmp (annex, "interp") == 0) |
723b724b | 6457 | addr = (int) LINUX_LOADMAP_INTERP; |
78d85199 YQ |
6458 | else |
6459 | return -1; | |
6460 | ||
723b724b | 6461 | if (ptrace (LINUX_LOADMAP, pid, addr, &data) != 0) |
78d85199 YQ |
6462 | return -1; |
6463 | ||
6464 | if (data == NULL) | |
6465 | return -1; | |
6466 | ||
6467 | actual_length = sizeof (struct target_loadmap) | |
6468 | + sizeof (struct target_loadseg) * data->nsegs; | |
6469 | ||
6470 | if (offset < 0 || offset > actual_length) | |
6471 | return -1; | |
6472 | ||
6473 | copy_length = actual_length - offset < len ? actual_length - offset : len; | |
6474 | memcpy (myaddr, (char *) data + offset, copy_length); | |
6475 | return copy_length; | |
6476 | } | |
723b724b | 6477 | #endif /* defined PT_GETDSBT || defined PTRACE_GETFDPIC */ |
78d85199 | 6478 | |
0df28b1b TBA |
6479 | void |
6480 | linux_process_target::process_qsupported (char **features, int count) | |
1570b33e L |
6481 | { |
6482 | if (the_low_target.process_qsupported != NULL) | |
06e03fff | 6483 | the_low_target.process_qsupported (features, count); |
1570b33e L |
6484 | } |
6485 | ||
bc8d3ae4 TBA |
6486 | bool |
6487 | linux_process_target::supports_catch_syscall () | |
82075af2 JS |
6488 | { |
6489 | return (the_low_target.get_syscall_trapinfo != NULL | |
6490 | && linux_supports_tracesysgood ()); | |
6491 | } | |
6492 | ||
d633e831 TBA |
6493 | int |
6494 | linux_process_target::get_ipa_tdesc_idx () | |
ae91f625 MK |
6495 | { |
6496 | if (the_low_target.get_ipa_tdesc_idx == NULL) | |
6497 | return 0; | |
6498 | ||
6499 | return (*the_low_target.get_ipa_tdesc_idx) (); | |
6500 | } | |
6501 | ||
290732bf TBA |
6502 | bool |
6503 | linux_process_target::supports_tracepoints () | |
219f2f23 PA |
6504 | { |
6505 | if (*the_low_target.supports_tracepoints == NULL) | |
290732bf | 6506 | return false; |
219f2f23 PA |
6507 | |
6508 | return (*the_low_target.supports_tracepoints) (); | |
6509 | } | |
6510 | ||
770d8f6a TBA |
6511 | CORE_ADDR |
6512 | linux_process_target::read_pc (regcache *regcache) | |
219f2f23 PA |
6513 | { |
6514 | if (the_low_target.get_pc == NULL) | |
6515 | return 0; | |
6516 | ||
6517 | return (*the_low_target.get_pc) (regcache); | |
6518 | } | |
6519 | ||
770d8f6a TBA |
6520 | void |
6521 | linux_process_target::write_pc (regcache *regcache, CORE_ADDR pc) | |
219f2f23 PA |
6522 | { |
6523 | gdb_assert (the_low_target.set_pc != NULL); | |
6524 | ||
6525 | (*the_low_target.set_pc) (regcache, pc); | |
6526 | } | |
6527 | ||
68119632 TBA |
6528 | bool |
6529 | linux_process_target::supports_thread_stopped () | |
6530 | { | |
6531 | return true; | |
6532 | } | |
6533 | ||
6534 | bool | |
6535 | linux_process_target::thread_stopped (thread_info *thread) | |
8336d594 PA |
6536 | { |
6537 | return get_thread_lwp (thread)->stopped; | |
6538 | } | |
6539 | ||
6540 | /* This exposes stop-all-threads functionality to other modules. */ | |
6541 | ||
29e8dc09 TBA |
6542 | void |
6543 | linux_process_target::pause_all (bool freeze) | |
8336d594 | 6544 | { |
7984d532 PA |
6545 | stop_all_lwps (freeze, NULL); |
6546 | } | |
6547 | ||
6548 | /* This exposes unstop-all-threads functionality to other gdbserver | |
6549 | modules. */ | |
6550 | ||
29e8dc09 TBA |
6551 | void |
6552 | linux_process_target::unpause_all (bool unfreeze) | |
7984d532 PA |
6553 | { |
6554 | unstop_all_lwps (unfreeze, NULL); | |
8336d594 PA |
6555 | } |
6556 | ||
79b44087 TBA |
6557 | int |
6558 | linux_process_target::prepare_to_access_memory () | |
90d74c30 PA |
6559 | { |
6560 | /* Neither ptrace nor /proc/PID/mem allow accessing memory through a | |
6561 | running LWP. */ | |
6562 | if (non_stop) | |
29e8dc09 | 6563 | target_pause_all (true); |
90d74c30 PA |
6564 | return 0; |
6565 | } | |
6566 | ||
79b44087 TBA |
6567 | void |
6568 | linux_process_target::done_accessing_memory () | |
90d74c30 PA |
6569 | { |
6570 | /* Neither ptrace nor /proc/PID/mem allow accessing memory through a | |
6571 | running LWP. */ | |
6572 | if (non_stop) | |
29e8dc09 | 6573 | target_unpause_all (true); |
90d74c30 PA |
6574 | } |
6575 | ||
c23c9391 TBA |
6576 | bool |
6577 | linux_process_target::supports_fast_tracepoints () | |
6578 | { | |
6579 | return the_low_target.install_fast_tracepoint_jump_pad != nullptr; | |
6580 | } | |
6581 | ||
6582 | int | |
6583 | linux_process_target::install_fast_tracepoint_jump_pad | |
6584 | (CORE_ADDR tpoint, CORE_ADDR tpaddr, CORE_ADDR collector, | |
6585 | CORE_ADDR lockaddr, ULONGEST orig_size, CORE_ADDR *jump_entry, | |
6586 | CORE_ADDR *trampoline, ULONGEST *trampoline_size, | |
6587 | unsigned char *jjump_pad_insn, ULONGEST *jjump_pad_insn_size, | |
6588 | CORE_ADDR *adjusted_insn_addr, CORE_ADDR *adjusted_insn_addr_end, | |
6589 | char *err) | |
fa593d66 PA |
6590 | { |
6591 | return (*the_low_target.install_fast_tracepoint_jump_pad) | |
6592 | (tpoint, tpaddr, collector, lockaddr, orig_size, | |
405f8e94 SS |
6593 | jump_entry, trampoline, trampoline_size, |
6594 | jjump_pad_insn, jjump_pad_insn_size, | |
6595 | adjusted_insn_addr, adjusted_insn_addr_end, | |
6596 | err); | |
fa593d66 PA |
6597 | } |
6598 | ||
345dafad TBA |
6599 | emit_ops * |
6600 | linux_process_target::emit_ops () | |
6a271cae PA |
6601 | { |
6602 | if (the_low_target.emit_ops != NULL) | |
6603 | return (*the_low_target.emit_ops) (); | |
6604 | else | |
6605 | return NULL; | |
6606 | } | |
6607 | ||
c23c9391 TBA |
6608 | int |
6609 | linux_process_target::get_min_fast_tracepoint_insn_len () | |
405f8e94 SS |
6610 | { |
6611 | return (*the_low_target.get_min_fast_tracepoint_insn_len) (); | |
6612 | } | |
6613 | ||
2268b414 JK |
6614 | /* Extract &phdr and num_phdr in the inferior. Return 0 on success. */ |
6615 | ||
6616 | static int | |
6617 | get_phdr_phnum_from_proc_auxv (const int pid, const int is_elf64, | |
6618 | CORE_ADDR *phdr_memaddr, int *num_phdr) | |
6619 | { | |
6620 | char filename[PATH_MAX]; | |
6621 | int fd; | |
6622 | const int auxv_size = is_elf64 | |
6623 | ? sizeof (Elf64_auxv_t) : sizeof (Elf32_auxv_t); | |
6624 | char buf[sizeof (Elf64_auxv_t)]; /* The larger of the two. */ | |
6625 | ||
6626 | xsnprintf (filename, sizeof filename, "/proc/%d/auxv", pid); | |
6627 | ||
6628 | fd = open (filename, O_RDONLY); | |
6629 | if (fd < 0) | |
6630 | return 1; | |
6631 | ||
6632 | *phdr_memaddr = 0; | |
6633 | *num_phdr = 0; | |
6634 | while (read (fd, buf, auxv_size) == auxv_size | |
6635 | && (*phdr_memaddr == 0 || *num_phdr == 0)) | |
6636 | { | |
6637 | if (is_elf64) | |
6638 | { | |
6639 | Elf64_auxv_t *const aux = (Elf64_auxv_t *) buf; | |
6640 | ||
6641 | switch (aux->a_type) | |
6642 | { | |
6643 | case AT_PHDR: | |
6644 | *phdr_memaddr = aux->a_un.a_val; | |
6645 | break; | |
6646 | case AT_PHNUM: | |
6647 | *num_phdr = aux->a_un.a_val; | |
6648 | break; | |
6649 | } | |
6650 | } | |
6651 | else | |
6652 | { | |
6653 | Elf32_auxv_t *const aux = (Elf32_auxv_t *) buf; | |
6654 | ||
6655 | switch (aux->a_type) | |
6656 | { | |
6657 | case AT_PHDR: | |
6658 | *phdr_memaddr = aux->a_un.a_val; | |
6659 | break; | |
6660 | case AT_PHNUM: | |
6661 | *num_phdr = aux->a_un.a_val; | |
6662 | break; | |
6663 | } | |
6664 | } | |
6665 | } | |
6666 | ||
6667 | close (fd); | |
6668 | ||
6669 | if (*phdr_memaddr == 0 || *num_phdr == 0) | |
6670 | { | |
6671 | warning ("Unexpected missing AT_PHDR and/or AT_PHNUM: " | |
6672 | "phdr_memaddr = %ld, phdr_num = %d", | |
6673 | (long) *phdr_memaddr, *num_phdr); | |
6674 | return 2; | |
6675 | } | |
6676 | ||
6677 | return 0; | |
6678 | } | |
6679 | ||
6680 | /* Return &_DYNAMIC (via PT_DYNAMIC) in the inferior, or 0 if not present. */ | |
6681 | ||
6682 | static CORE_ADDR | |
6683 | get_dynamic (const int pid, const int is_elf64) | |
6684 | { | |
6685 | CORE_ADDR phdr_memaddr, relocation; | |
db1ff28b | 6686 | int num_phdr, i; |
2268b414 | 6687 | unsigned char *phdr_buf; |
db1ff28b | 6688 | const int phdr_size = is_elf64 ? sizeof (Elf64_Phdr) : sizeof (Elf32_Phdr); |
2268b414 JK |
6689 | |
6690 | if (get_phdr_phnum_from_proc_auxv (pid, is_elf64, &phdr_memaddr, &num_phdr)) | |
6691 | return 0; | |
6692 | ||
6693 | gdb_assert (num_phdr < 100); /* Basic sanity check. */ | |
224c3ddb | 6694 | phdr_buf = (unsigned char *) alloca (num_phdr * phdr_size); |
2268b414 JK |
6695 | |
6696 | if (linux_read_memory (phdr_memaddr, phdr_buf, num_phdr * phdr_size)) | |
6697 | return 0; | |
6698 | ||
6699 | /* Compute relocation: it is expected to be 0 for "regular" executables, | |
6700 | non-zero for PIE ones. */ | |
6701 | relocation = -1; | |
db1ff28b JK |
6702 | for (i = 0; relocation == -1 && i < num_phdr; i++) |
6703 | if (is_elf64) | |
6704 | { | |
6705 | Elf64_Phdr *const p = (Elf64_Phdr *) (phdr_buf + i * phdr_size); | |
6706 | ||
6707 | if (p->p_type == PT_PHDR) | |
6708 | relocation = phdr_memaddr - p->p_vaddr; | |
6709 | } | |
6710 | else | |
6711 | { | |
6712 | Elf32_Phdr *const p = (Elf32_Phdr *) (phdr_buf + i * phdr_size); | |
6713 | ||
6714 | if (p->p_type == PT_PHDR) | |
6715 | relocation = phdr_memaddr - p->p_vaddr; | |
6716 | } | |
6717 | ||
2268b414 JK |
6718 | if (relocation == -1) |
6719 | { | |
e237a7e2 JK |
6720 | /* PT_PHDR is optional, but necessary for PIE in general. Fortunately |
6721 | any real world executables, including PIE executables, have always | |
6722 | PT_PHDR present. PT_PHDR is not present in some shared libraries or | |
6723 | in fpc (Free Pascal 2.4) binaries but neither of those have a need for | |
6724 | or present DT_DEBUG anyway (fpc binaries are statically linked). | |
6725 | ||
6726 | Therefore if there exists DT_DEBUG there is always also PT_PHDR. | |
6727 | ||
6728 | GDB could find RELOCATION also from AT_ENTRY - e_entry. */ | |
6729 | ||
2268b414 JK |
6730 | return 0; |
6731 | } | |
6732 | ||
db1ff28b JK |
6733 | for (i = 0; i < num_phdr; i++) |
6734 | { | |
6735 | if (is_elf64) | |
6736 | { | |
6737 | Elf64_Phdr *const p = (Elf64_Phdr *) (phdr_buf + i * phdr_size); | |
6738 | ||
6739 | if (p->p_type == PT_DYNAMIC) | |
6740 | return p->p_vaddr + relocation; | |
6741 | } | |
6742 | else | |
6743 | { | |
6744 | Elf32_Phdr *const p = (Elf32_Phdr *) (phdr_buf + i * phdr_size); | |
2268b414 | 6745 | |
db1ff28b JK |
6746 | if (p->p_type == PT_DYNAMIC) |
6747 | return p->p_vaddr + relocation; | |
6748 | } | |
6749 | } | |
2268b414 JK |
6750 | |
6751 | return 0; | |
6752 | } | |
6753 | ||
6754 | /* Return &_r_debug in the inferior, or -1 if not present. Return value | |
367ba2c2 MR |
6755 | can be 0 if the inferior does not yet have the library list initialized. |
6756 | We look for DT_MIPS_RLD_MAP first. MIPS executables use this instead of | |
6757 | DT_DEBUG, although they sometimes contain an unused DT_DEBUG entry too. */ | |
2268b414 JK |
6758 | |
6759 | static CORE_ADDR | |
6760 | get_r_debug (const int pid, const int is_elf64) | |
6761 | { | |
6762 | CORE_ADDR dynamic_memaddr; | |
6763 | const int dyn_size = is_elf64 ? sizeof (Elf64_Dyn) : sizeof (Elf32_Dyn); | |
6764 | unsigned char buf[sizeof (Elf64_Dyn)]; /* The larger of the two. */ | |
367ba2c2 | 6765 | CORE_ADDR map = -1; |
2268b414 JK |
6766 | |
6767 | dynamic_memaddr = get_dynamic (pid, is_elf64); | |
6768 | if (dynamic_memaddr == 0) | |
367ba2c2 | 6769 | return map; |
2268b414 JK |
6770 | |
6771 | while (linux_read_memory (dynamic_memaddr, buf, dyn_size) == 0) | |
6772 | { | |
6773 | if (is_elf64) | |
6774 | { | |
6775 | Elf64_Dyn *const dyn = (Elf64_Dyn *) buf; | |
a738da3a | 6776 | #if defined DT_MIPS_RLD_MAP || defined DT_MIPS_RLD_MAP_REL |
367ba2c2 MR |
6777 | union |
6778 | { | |
6779 | Elf64_Xword map; | |
6780 | unsigned char buf[sizeof (Elf64_Xword)]; | |
6781 | } | |
6782 | rld_map; | |
a738da3a MF |
6783 | #endif |
6784 | #ifdef DT_MIPS_RLD_MAP | |
367ba2c2 MR |
6785 | if (dyn->d_tag == DT_MIPS_RLD_MAP) |
6786 | { | |
6787 | if (linux_read_memory (dyn->d_un.d_val, | |
6788 | rld_map.buf, sizeof (rld_map.buf)) == 0) | |
6789 | return rld_map.map; | |
6790 | else | |
6791 | break; | |
6792 | } | |
75f62ce7 | 6793 | #endif /* DT_MIPS_RLD_MAP */ |
a738da3a MF |
6794 | #ifdef DT_MIPS_RLD_MAP_REL |
6795 | if (dyn->d_tag == DT_MIPS_RLD_MAP_REL) | |
6796 | { | |
6797 | if (linux_read_memory (dyn->d_un.d_val + dynamic_memaddr, | |
6798 | rld_map.buf, sizeof (rld_map.buf)) == 0) | |
6799 | return rld_map.map; | |
6800 | else | |
6801 | break; | |
6802 | } | |
6803 | #endif /* DT_MIPS_RLD_MAP_REL */ | |
2268b414 | 6804 | |
367ba2c2 MR |
6805 | if (dyn->d_tag == DT_DEBUG && map == -1) |
6806 | map = dyn->d_un.d_val; | |
2268b414 JK |
6807 | |
6808 | if (dyn->d_tag == DT_NULL) | |
6809 | break; | |
6810 | } | |
6811 | else | |
6812 | { | |
6813 | Elf32_Dyn *const dyn = (Elf32_Dyn *) buf; | |
a738da3a | 6814 | #if defined DT_MIPS_RLD_MAP || defined DT_MIPS_RLD_MAP_REL |
367ba2c2 MR |
6815 | union |
6816 | { | |
6817 | Elf32_Word map; | |
6818 | unsigned char buf[sizeof (Elf32_Word)]; | |
6819 | } | |
6820 | rld_map; | |
a738da3a MF |
6821 | #endif |
6822 | #ifdef DT_MIPS_RLD_MAP | |
367ba2c2 MR |
6823 | if (dyn->d_tag == DT_MIPS_RLD_MAP) |
6824 | { | |
6825 | if (linux_read_memory (dyn->d_un.d_val, | |
6826 | rld_map.buf, sizeof (rld_map.buf)) == 0) | |
6827 | return rld_map.map; | |
6828 | else | |
6829 | break; | |
6830 | } | |
75f62ce7 | 6831 | #endif /* DT_MIPS_RLD_MAP */ |
a738da3a MF |
6832 | #ifdef DT_MIPS_RLD_MAP_REL |
6833 | if (dyn->d_tag == DT_MIPS_RLD_MAP_REL) | |
6834 | { | |
6835 | if (linux_read_memory (dyn->d_un.d_val + dynamic_memaddr, | |
6836 | rld_map.buf, sizeof (rld_map.buf)) == 0) | |
6837 | return rld_map.map; | |
6838 | else | |
6839 | break; | |
6840 | } | |
6841 | #endif /* DT_MIPS_RLD_MAP_REL */ | |
2268b414 | 6842 | |
367ba2c2 MR |
6843 | if (dyn->d_tag == DT_DEBUG && map == -1) |
6844 | map = dyn->d_un.d_val; | |
2268b414 JK |
6845 | |
6846 | if (dyn->d_tag == DT_NULL) | |
6847 | break; | |
6848 | } | |
6849 | ||
6850 | dynamic_memaddr += dyn_size; | |
6851 | } | |
6852 | ||
367ba2c2 | 6853 | return map; |
2268b414 JK |
6854 | } |
6855 | ||
6856 | /* Read one pointer from MEMADDR in the inferior. */ | |
6857 | ||
6858 | static int | |
6859 | read_one_ptr (CORE_ADDR memaddr, CORE_ADDR *ptr, int ptr_size) | |
6860 | { | |
485f1ee4 PA |
6861 | int ret; |
6862 | ||
6863 | /* Go through a union so this works on either big or little endian | |
6864 | hosts, when the inferior's pointer size is smaller than the size | |
6865 | of CORE_ADDR. It is assumed the inferior's endianness is the | |
6866 | same of the superior's. */ | |
6867 | union | |
6868 | { | |
6869 | CORE_ADDR core_addr; | |
6870 | unsigned int ui; | |
6871 | unsigned char uc; | |
6872 | } addr; | |
6873 | ||
6874 | ret = linux_read_memory (memaddr, &addr.uc, ptr_size); | |
6875 | if (ret == 0) | |
6876 | { | |
6877 | if (ptr_size == sizeof (CORE_ADDR)) | |
6878 | *ptr = addr.core_addr; | |
6879 | else if (ptr_size == sizeof (unsigned int)) | |
6880 | *ptr = addr.ui; | |
6881 | else | |
6882 | gdb_assert_not_reached ("unhandled pointer size"); | |
6883 | } | |
6884 | return ret; | |
2268b414 JK |
6885 | } |
6886 | ||
974387bb TBA |
6887 | bool |
6888 | linux_process_target::supports_qxfer_libraries_svr4 () | |
6889 | { | |
6890 | return true; | |
6891 | } | |
6892 | ||
2268b414 JK |
6893 | struct link_map_offsets |
6894 | { | |
6895 | /* Offset and size of r_debug.r_version. */ | |
6896 | int r_version_offset; | |
6897 | ||
6898 | /* Offset and size of r_debug.r_map. */ | |
6899 | int r_map_offset; | |
6900 | ||
6901 | /* Offset to l_addr field in struct link_map. */ | |
6902 | int l_addr_offset; | |
6903 | ||
6904 | /* Offset to l_name field in struct link_map. */ | |
6905 | int l_name_offset; | |
6906 | ||
6907 | /* Offset to l_ld field in struct link_map. */ | |
6908 | int l_ld_offset; | |
6909 | ||
6910 | /* Offset to l_next field in struct link_map. */ | |
6911 | int l_next_offset; | |
6912 | ||
6913 | /* Offset to l_prev field in struct link_map. */ | |
6914 | int l_prev_offset; | |
6915 | }; | |
6916 | ||
fb723180 | 6917 | /* Construct qXfer:libraries-svr4:read reply. */ |
2268b414 | 6918 | |
974387bb TBA |
6919 | int |
6920 | linux_process_target::qxfer_libraries_svr4 (const char *annex, | |
6921 | unsigned char *readbuf, | |
6922 | unsigned const char *writebuf, | |
6923 | CORE_ADDR offset, int len) | |
2268b414 | 6924 | { |
fe978cb0 | 6925 | struct process_info_private *const priv = current_process ()->priv; |
2268b414 JK |
6926 | char filename[PATH_MAX]; |
6927 | int pid, is_elf64; | |
6928 | ||
6929 | static const struct link_map_offsets lmo_32bit_offsets = | |
6930 | { | |
6931 | 0, /* r_version offset. */ | |
6932 | 4, /* r_debug.r_map offset. */ | |
6933 | 0, /* l_addr offset in link_map. */ | |
6934 | 4, /* l_name offset in link_map. */ | |
6935 | 8, /* l_ld offset in link_map. */ | |
6936 | 12, /* l_next offset in link_map. */ | |
6937 | 16 /* l_prev offset in link_map. */ | |
6938 | }; | |
6939 | ||
6940 | static const struct link_map_offsets lmo_64bit_offsets = | |
6941 | { | |
6942 | 0, /* r_version offset. */ | |
6943 | 8, /* r_debug.r_map offset. */ | |
6944 | 0, /* l_addr offset in link_map. */ | |
6945 | 8, /* l_name offset in link_map. */ | |
6946 | 16, /* l_ld offset in link_map. */ | |
6947 | 24, /* l_next offset in link_map. */ | |
6948 | 32 /* l_prev offset in link_map. */ | |
6949 | }; | |
6950 | const struct link_map_offsets *lmo; | |
214d508e | 6951 | unsigned int machine; |
b1fbec62 GB |
6952 | int ptr_size; |
6953 | CORE_ADDR lm_addr = 0, lm_prev = 0; | |
b1fbec62 GB |
6954 | CORE_ADDR l_name, l_addr, l_ld, l_next, l_prev; |
6955 | int header_done = 0; | |
2268b414 JK |
6956 | |
6957 | if (writebuf != NULL) | |
6958 | return -2; | |
6959 | if (readbuf == NULL) | |
6960 | return -1; | |
6961 | ||
0bfdf32f | 6962 | pid = lwpid_of (current_thread); |
2268b414 | 6963 | xsnprintf (filename, sizeof filename, "/proc/%d/exe", pid); |
214d508e | 6964 | is_elf64 = elf_64_file_p (filename, &machine); |
2268b414 | 6965 | lmo = is_elf64 ? &lmo_64bit_offsets : &lmo_32bit_offsets; |
b1fbec62 | 6966 | ptr_size = is_elf64 ? 8 : 4; |
2268b414 | 6967 | |
b1fbec62 GB |
6968 | while (annex[0] != '\0') |
6969 | { | |
6970 | const char *sep; | |
6971 | CORE_ADDR *addrp; | |
da4ae14a | 6972 | int name_len; |
2268b414 | 6973 | |
b1fbec62 GB |
6974 | sep = strchr (annex, '='); |
6975 | if (sep == NULL) | |
6976 | break; | |
0c5bf5a9 | 6977 | |
da4ae14a TT |
6978 | name_len = sep - annex; |
6979 | if (name_len == 5 && startswith (annex, "start")) | |
b1fbec62 | 6980 | addrp = &lm_addr; |
da4ae14a | 6981 | else if (name_len == 4 && startswith (annex, "prev")) |
b1fbec62 GB |
6982 | addrp = &lm_prev; |
6983 | else | |
6984 | { | |
6985 | annex = strchr (sep, ';'); | |
6986 | if (annex == NULL) | |
6987 | break; | |
6988 | annex++; | |
6989 | continue; | |
6990 | } | |
6991 | ||
6992 | annex = decode_address_to_semicolon (addrp, sep + 1); | |
2268b414 | 6993 | } |
b1fbec62 GB |
6994 | |
6995 | if (lm_addr == 0) | |
2268b414 | 6996 | { |
b1fbec62 GB |
6997 | int r_version = 0; |
6998 | ||
6999 | if (priv->r_debug == 0) | |
7000 | priv->r_debug = get_r_debug (pid, is_elf64); | |
7001 | ||
7002 | /* We failed to find DT_DEBUG. Such situation will not change | |
7003 | for this inferior - do not retry it. Report it to GDB as | |
7004 | E01, see for the reasons at the GDB solib-svr4.c side. */ | |
7005 | if (priv->r_debug == (CORE_ADDR) -1) | |
7006 | return -1; | |
7007 | ||
7008 | if (priv->r_debug != 0) | |
2268b414 | 7009 | { |
b1fbec62 GB |
7010 | if (linux_read_memory (priv->r_debug + lmo->r_version_offset, |
7011 | (unsigned char *) &r_version, | |
7012 | sizeof (r_version)) != 0 | |
7013 | || r_version != 1) | |
7014 | { | |
7015 | warning ("unexpected r_debug version %d", r_version); | |
7016 | } | |
7017 | else if (read_one_ptr (priv->r_debug + lmo->r_map_offset, | |
7018 | &lm_addr, ptr_size) != 0) | |
7019 | { | |
7020 | warning ("unable to read r_map from 0x%lx", | |
7021 | (long) priv->r_debug + lmo->r_map_offset); | |
7022 | } | |
2268b414 | 7023 | } |
b1fbec62 | 7024 | } |
2268b414 | 7025 | |
f6e8a41e | 7026 | std::string document = "<library-list-svr4 version=\"1.0\""; |
b1fbec62 GB |
7027 | |
7028 | while (lm_addr | |
7029 | && read_one_ptr (lm_addr + lmo->l_name_offset, | |
7030 | &l_name, ptr_size) == 0 | |
7031 | && read_one_ptr (lm_addr + lmo->l_addr_offset, | |
7032 | &l_addr, ptr_size) == 0 | |
7033 | && read_one_ptr (lm_addr + lmo->l_ld_offset, | |
7034 | &l_ld, ptr_size) == 0 | |
7035 | && read_one_ptr (lm_addr + lmo->l_prev_offset, | |
7036 | &l_prev, ptr_size) == 0 | |
7037 | && read_one_ptr (lm_addr + lmo->l_next_offset, | |
7038 | &l_next, ptr_size) == 0) | |
7039 | { | |
7040 | unsigned char libname[PATH_MAX]; | |
7041 | ||
7042 | if (lm_prev != l_prev) | |
2268b414 | 7043 | { |
b1fbec62 GB |
7044 | warning ("Corrupted shared library list: 0x%lx != 0x%lx", |
7045 | (long) lm_prev, (long) l_prev); | |
7046 | break; | |
2268b414 JK |
7047 | } |
7048 | ||
d878444c JK |
7049 | /* Ignore the first entry even if it has valid name as the first entry |
7050 | corresponds to the main executable. The first entry should not be | |
7051 | skipped if the dynamic loader was loaded late by a static executable | |
7052 | (see solib-svr4.c parameter ignore_first). But in such case the main | |
7053 | executable does not have PT_DYNAMIC present and this function already | |
7054 | exited above due to failed get_r_debug. */ | |
7055 | if (lm_prev == 0) | |
f6e8a41e | 7056 | string_appendf (document, " main-lm=\"0x%lx\"", (unsigned long) lm_addr); |
d878444c JK |
7057 | else |
7058 | { | |
7059 | /* Not checking for error because reading may stop before | |
7060 | we've got PATH_MAX worth of characters. */ | |
7061 | libname[0] = '\0'; | |
7062 | linux_read_memory (l_name, libname, sizeof (libname) - 1); | |
7063 | libname[sizeof (libname) - 1] = '\0'; | |
7064 | if (libname[0] != '\0') | |
2268b414 | 7065 | { |
d878444c JK |
7066 | if (!header_done) |
7067 | { | |
7068 | /* Terminate `<library-list-svr4'. */ | |
f6e8a41e | 7069 | document += '>'; |
d878444c JK |
7070 | header_done = 1; |
7071 | } | |
2268b414 | 7072 | |
e6a58aa8 SM |
7073 | string_appendf (document, "<library name=\""); |
7074 | xml_escape_text_append (&document, (char *) libname); | |
7075 | string_appendf (document, "\" lm=\"0x%lx\" " | |
f6e8a41e | 7076 | "l_addr=\"0x%lx\" l_ld=\"0x%lx\"/>", |
e6a58aa8 SM |
7077 | (unsigned long) lm_addr, (unsigned long) l_addr, |
7078 | (unsigned long) l_ld); | |
d878444c | 7079 | } |
0afae3cf | 7080 | } |
b1fbec62 GB |
7081 | |
7082 | lm_prev = lm_addr; | |
7083 | lm_addr = l_next; | |
2268b414 JK |
7084 | } |
7085 | ||
b1fbec62 GB |
7086 | if (!header_done) |
7087 | { | |
7088 | /* Empty list; terminate `<library-list-svr4'. */ | |
f6e8a41e | 7089 | document += "/>"; |
b1fbec62 GB |
7090 | } |
7091 | else | |
f6e8a41e | 7092 | document += "</library-list-svr4>"; |
b1fbec62 | 7093 | |
f6e8a41e | 7094 | int document_len = document.length (); |
2268b414 JK |
7095 | if (offset < document_len) |
7096 | document_len -= offset; | |
7097 | else | |
7098 | document_len = 0; | |
7099 | if (len > document_len) | |
7100 | len = document_len; | |
7101 | ||
f6e8a41e | 7102 | memcpy (readbuf, document.data () + offset, len); |
2268b414 JK |
7103 | |
7104 | return len; | |
7105 | } | |
7106 | ||
9accd112 MM |
7107 | #ifdef HAVE_LINUX_BTRACE |
7108 | ||
79597bdd TBA |
7109 | btrace_target_info * |
7110 | linux_process_target::enable_btrace (ptid_t ptid, | |
7111 | const btrace_config *conf) | |
7112 | { | |
7113 | return linux_enable_btrace (ptid, conf); | |
7114 | } | |
7115 | ||
969c39fb | 7116 | /* See to_disable_btrace target method. */ |
9accd112 | 7117 | |
79597bdd TBA |
7118 | int |
7119 | linux_process_target::disable_btrace (btrace_target_info *tinfo) | |
969c39fb MM |
7120 | { |
7121 | enum btrace_error err; | |
7122 | ||
7123 | err = linux_disable_btrace (tinfo); | |
7124 | return (err == BTRACE_ERR_NONE ? 0 : -1); | |
7125 | } | |
7126 | ||
bc504a31 | 7127 | /* Encode an Intel Processor Trace configuration. */ |
b20a6524 MM |
7128 | |
7129 | static void | |
7130 | linux_low_encode_pt_config (struct buffer *buffer, | |
7131 | const struct btrace_data_pt_config *config) | |
7132 | { | |
7133 | buffer_grow_str (buffer, "<pt-config>\n"); | |
7134 | ||
7135 | switch (config->cpu.vendor) | |
7136 | { | |
7137 | case CV_INTEL: | |
7138 | buffer_xml_printf (buffer, "<cpu vendor=\"GenuineIntel\" family=\"%u\" " | |
7139 | "model=\"%u\" stepping=\"%u\"/>\n", | |
7140 | config->cpu.family, config->cpu.model, | |
7141 | config->cpu.stepping); | |
7142 | break; | |
7143 | ||
7144 | default: | |
7145 | break; | |
7146 | } | |
7147 | ||
7148 | buffer_grow_str (buffer, "</pt-config>\n"); | |
7149 | } | |
7150 | ||
7151 | /* Encode a raw buffer. */ | |
7152 | ||
7153 | static void | |
7154 | linux_low_encode_raw (struct buffer *buffer, const gdb_byte *data, | |
7155 | unsigned int size) | |
7156 | { | |
7157 | if (size == 0) | |
7158 | return; | |
7159 | ||
268a13a5 | 7160 | /* We use hex encoding - see gdbsupport/rsp-low.h. */ |
b20a6524 MM |
7161 | buffer_grow_str (buffer, "<raw>\n"); |
7162 | ||
7163 | while (size-- > 0) | |
7164 | { | |
7165 | char elem[2]; | |
7166 | ||
7167 | elem[0] = tohex ((*data >> 4) & 0xf); | |
7168 | elem[1] = tohex (*data++ & 0xf); | |
7169 | ||
7170 | buffer_grow (buffer, elem, 2); | |
7171 | } | |
7172 | ||
7173 | buffer_grow_str (buffer, "</raw>\n"); | |
7174 | } | |
7175 | ||
969c39fb MM |
7176 | /* See to_read_btrace target method. */ |
7177 | ||
79597bdd TBA |
7178 | int |
7179 | linux_process_target::read_btrace (btrace_target_info *tinfo, | |
7180 | buffer *buffer, | |
7181 | enum btrace_read_type type) | |
9accd112 | 7182 | { |
734b0e4b | 7183 | struct btrace_data btrace; |
969c39fb | 7184 | enum btrace_error err; |
9accd112 | 7185 | |
969c39fb MM |
7186 | err = linux_read_btrace (&btrace, tinfo, type); |
7187 | if (err != BTRACE_ERR_NONE) | |
7188 | { | |
7189 | if (err == BTRACE_ERR_OVERFLOW) | |
7190 | buffer_grow_str0 (buffer, "E.Overflow."); | |
7191 | else | |
7192 | buffer_grow_str0 (buffer, "E.Generic Error."); | |
7193 | ||
8dcc53b3 | 7194 | return -1; |
969c39fb | 7195 | } |
9accd112 | 7196 | |
734b0e4b MM |
7197 | switch (btrace.format) |
7198 | { | |
7199 | case BTRACE_FORMAT_NONE: | |
7200 | buffer_grow_str0 (buffer, "E.No Trace."); | |
8dcc53b3 | 7201 | return -1; |
734b0e4b MM |
7202 | |
7203 | case BTRACE_FORMAT_BTS: | |
7204 | buffer_grow_str (buffer, "<!DOCTYPE btrace SYSTEM \"btrace.dtd\">\n"); | |
7205 | buffer_grow_str (buffer, "<btrace version=\"1.0\">\n"); | |
9accd112 | 7206 | |
46f29a9a | 7207 | for (const btrace_block &block : *btrace.variant.bts.blocks) |
734b0e4b | 7208 | buffer_xml_printf (buffer, "<block begin=\"0x%s\" end=\"0x%s\"/>\n", |
46f29a9a | 7209 | paddress (block.begin), paddress (block.end)); |
9accd112 | 7210 | |
734b0e4b MM |
7211 | buffer_grow_str0 (buffer, "</btrace>\n"); |
7212 | break; | |
7213 | ||
b20a6524 MM |
7214 | case BTRACE_FORMAT_PT: |
7215 | buffer_grow_str (buffer, "<!DOCTYPE btrace SYSTEM \"btrace.dtd\">\n"); | |
7216 | buffer_grow_str (buffer, "<btrace version=\"1.0\">\n"); | |
7217 | buffer_grow_str (buffer, "<pt>\n"); | |
7218 | ||
7219 | linux_low_encode_pt_config (buffer, &btrace.variant.pt.config); | |
9accd112 | 7220 | |
b20a6524 MM |
7221 | linux_low_encode_raw (buffer, btrace.variant.pt.data, |
7222 | btrace.variant.pt.size); | |
7223 | ||
7224 | buffer_grow_str (buffer, "</pt>\n"); | |
7225 | buffer_grow_str0 (buffer, "</btrace>\n"); | |
7226 | break; | |
7227 | ||
7228 | default: | |
7229 | buffer_grow_str0 (buffer, "E.Unsupported Trace Format."); | |
8dcc53b3 | 7230 | return -1; |
734b0e4b | 7231 | } |
969c39fb MM |
7232 | |
7233 | return 0; | |
9accd112 | 7234 | } |
f4abbc16 MM |
7235 | |
7236 | /* See to_btrace_conf target method. */ | |
7237 | ||
79597bdd TBA |
7238 | int |
7239 | linux_process_target::read_btrace_conf (const btrace_target_info *tinfo, | |
7240 | buffer *buffer) | |
f4abbc16 MM |
7241 | { |
7242 | const struct btrace_config *conf; | |
7243 | ||
7244 | buffer_grow_str (buffer, "<!DOCTYPE btrace-conf SYSTEM \"btrace-conf.dtd\">\n"); | |
7245 | buffer_grow_str (buffer, "<btrace-conf version=\"1.0\">\n"); | |
7246 | ||
7247 | conf = linux_btrace_conf (tinfo); | |
7248 | if (conf != NULL) | |
7249 | { | |
7250 | switch (conf->format) | |
7251 | { | |
7252 | case BTRACE_FORMAT_NONE: | |
7253 | break; | |
7254 | ||
7255 | case BTRACE_FORMAT_BTS: | |
d33501a5 MM |
7256 | buffer_xml_printf (buffer, "<bts"); |
7257 | buffer_xml_printf (buffer, " size=\"0x%x\"", conf->bts.size); | |
7258 | buffer_xml_printf (buffer, " />\n"); | |
f4abbc16 | 7259 | break; |
b20a6524 MM |
7260 | |
7261 | case BTRACE_FORMAT_PT: | |
7262 | buffer_xml_printf (buffer, "<pt"); | |
7263 | buffer_xml_printf (buffer, " size=\"0x%x\"", conf->pt.size); | |
7264 | buffer_xml_printf (buffer, "/>\n"); | |
7265 | break; | |
f4abbc16 MM |
7266 | } |
7267 | } | |
7268 | ||
7269 | buffer_grow_str0 (buffer, "</btrace-conf>\n"); | |
7270 | return 0; | |
7271 | } | |
9accd112 MM |
7272 | #endif /* HAVE_LINUX_BTRACE */ |
7273 | ||
7b669087 GB |
7274 | /* See nat/linux-nat.h. */ |
7275 | ||
7276 | ptid_t | |
7277 | current_lwp_ptid (void) | |
7278 | { | |
7279 | return ptid_of (current_thread); | |
7280 | } | |
7281 | ||
dd373349 AT |
7282 | /* Implementation of the target_ops method "breakpoint_kind_from_pc". */ |
7283 | ||
d367006f TBA |
7284 | int |
7285 | linux_process_target::breakpoint_kind_from_pc (CORE_ADDR *pcptr) | |
dd373349 AT |
7286 | { |
7287 | if (the_low_target.breakpoint_kind_from_pc != NULL) | |
7288 | return (*the_low_target.breakpoint_kind_from_pc) (pcptr); | |
7289 | else | |
52405d85 | 7290 | return process_stratum_target::breakpoint_kind_from_pc (pcptr); |
dd373349 AT |
7291 | } |
7292 | ||
7293 | /* Implementation of the target_ops method "sw_breakpoint_from_kind". */ | |
7294 | ||
d367006f TBA |
7295 | const gdb_byte * |
7296 | linux_process_target::sw_breakpoint_from_kind (int kind, int *size) | |
dd373349 AT |
7297 | { |
7298 | gdb_assert (the_low_target.sw_breakpoint_from_kind != NULL); | |
7299 | ||
7300 | return (*the_low_target.sw_breakpoint_from_kind) (kind, size); | |
7301 | } | |
7302 | ||
769ef81f AT |
7303 | /* Implementation of the target_ops method |
7304 | "breakpoint_kind_from_current_state". */ | |
7305 | ||
d367006f TBA |
7306 | int |
7307 | linux_process_target::breakpoint_kind_from_current_state (CORE_ADDR *pcptr) | |
769ef81f AT |
7308 | { |
7309 | if (the_low_target.breakpoint_kind_from_current_state != NULL) | |
7310 | return (*the_low_target.breakpoint_kind_from_current_state) (pcptr); | |
7311 | else | |
d367006f | 7312 | return breakpoint_kind_from_pc (pcptr); |
769ef81f AT |
7313 | } |
7314 | ||
7f63b89b TBA |
7315 | const char * |
7316 | linux_process_target::thread_name (ptid_t thread) | |
7317 | { | |
7318 | return linux_proc_tid_get_name (thread); | |
7319 | } | |
7320 | ||
7321 | #if USE_THREAD_DB | |
7322 | bool | |
7323 | linux_process_target::thread_handle (ptid_t ptid, gdb_byte **handle, | |
7324 | int *handle_len) | |
7325 | { | |
7326 | return thread_db_thread_handle (ptid, handle, handle_len); | |
7327 | } | |
7328 | #endif | |
7329 | ||
276d4552 YQ |
7330 | /* Default implementation of linux_target_ops method "set_pc" for |
7331 | 32-bit pc register which is literally named "pc". */ | |
7332 | ||
7333 | void | |
7334 | linux_set_pc_32bit (struct regcache *regcache, CORE_ADDR pc) | |
7335 | { | |
7336 | uint32_t newpc = pc; | |
7337 | ||
7338 | supply_register_by_name (regcache, "pc", &newpc); | |
7339 | } | |
7340 | ||
7341 | /* Default implementation of linux_target_ops method "get_pc" for | |
7342 | 32-bit pc register which is literally named "pc". */ | |
7343 | ||
7344 | CORE_ADDR | |
7345 | linux_get_pc_32bit (struct regcache *regcache) | |
7346 | { | |
7347 | uint32_t pc; | |
7348 | ||
7349 | collect_register_by_name (regcache, "pc", &pc); | |
7350 | if (debug_threads) | |
7351 | debug_printf ("stop pc is 0x%" PRIx32 "\n", pc); | |
7352 | return pc; | |
7353 | } | |
7354 | ||
6f69e520 YQ |
7355 | /* Default implementation of linux_target_ops method "set_pc" for |
7356 | 64-bit pc register which is literally named "pc". */ | |
7357 | ||
7358 | void | |
7359 | linux_set_pc_64bit (struct regcache *regcache, CORE_ADDR pc) | |
7360 | { | |
7361 | uint64_t newpc = pc; | |
7362 | ||
7363 | supply_register_by_name (regcache, "pc", &newpc); | |
7364 | } | |
7365 | ||
7366 | /* Default implementation of linux_target_ops method "get_pc" for | |
7367 | 64-bit pc register which is literally named "pc". */ | |
7368 | ||
7369 | CORE_ADDR | |
7370 | linux_get_pc_64bit (struct regcache *regcache) | |
7371 | { | |
7372 | uint64_t pc; | |
7373 | ||
7374 | collect_register_by_name (regcache, "pc", &pc); | |
7375 | if (debug_threads) | |
7376 | debug_printf ("stop pc is 0x%" PRIx64 "\n", pc); | |
7377 | return pc; | |
7378 | } | |
7379 | ||
0570503d | 7380 | /* See linux-low.h. */ |
974c89e0 | 7381 | |
0570503d PFC |
7382 | int |
7383 | linux_get_auxv (int wordsize, CORE_ADDR match, CORE_ADDR *valp) | |
974c89e0 AH |
7384 | { |
7385 | gdb_byte *data = (gdb_byte *) alloca (2 * wordsize); | |
7386 | int offset = 0; | |
7387 | ||
7388 | gdb_assert (wordsize == 4 || wordsize == 8); | |
7389 | ||
52405d85 | 7390 | while (the_target->read_auxv (offset, data, 2 * wordsize) == 2 * wordsize) |
974c89e0 AH |
7391 | { |
7392 | if (wordsize == 4) | |
7393 | { | |
0570503d | 7394 | uint32_t *data_p = (uint32_t *) data; |
974c89e0 | 7395 | if (data_p[0] == match) |
0570503d PFC |
7396 | { |
7397 | *valp = data_p[1]; | |
7398 | return 1; | |
7399 | } | |
974c89e0 AH |
7400 | } |
7401 | else | |
7402 | { | |
0570503d | 7403 | uint64_t *data_p = (uint64_t *) data; |
974c89e0 | 7404 | if (data_p[0] == match) |
0570503d PFC |
7405 | { |
7406 | *valp = data_p[1]; | |
7407 | return 1; | |
7408 | } | |
974c89e0 AH |
7409 | } |
7410 | ||
7411 | offset += 2 * wordsize; | |
7412 | } | |
7413 | ||
7414 | return 0; | |
7415 | } | |
7416 | ||
7417 | /* See linux-low.h. */ | |
7418 | ||
7419 | CORE_ADDR | |
7420 | linux_get_hwcap (int wordsize) | |
7421 | { | |
0570503d PFC |
7422 | CORE_ADDR hwcap = 0; |
7423 | linux_get_auxv (wordsize, AT_HWCAP, &hwcap); | |
7424 | return hwcap; | |
974c89e0 AH |
7425 | } |
7426 | ||
7427 | /* See linux-low.h. */ | |
7428 | ||
7429 | CORE_ADDR | |
7430 | linux_get_hwcap2 (int wordsize) | |
7431 | { | |
0570503d PFC |
7432 | CORE_ADDR hwcap2 = 0; |
7433 | linux_get_auxv (wordsize, AT_HWCAP2, &hwcap2); | |
7434 | return hwcap2; | |
974c89e0 | 7435 | } |
6f69e520 | 7436 | |
3aee8918 PA |
7437 | #ifdef HAVE_LINUX_REGSETS |
7438 | void | |
7439 | initialize_regsets_info (struct regsets_info *info) | |
7440 | { | |
7441 | for (info->num_regsets = 0; | |
7442 | info->regsets[info->num_regsets].size >= 0; | |
7443 | info->num_regsets++) | |
7444 | ; | |
3aee8918 PA |
7445 | } |
7446 | #endif | |
7447 | ||
da6d8c04 DJ |
7448 | void |
7449 | initialize_low (void) | |
7450 | { | |
bd99dc85 | 7451 | struct sigaction sigchld_action; |
dd373349 | 7452 | |
bd99dc85 | 7453 | memset (&sigchld_action, 0, sizeof (sigchld_action)); |
ef0478f6 | 7454 | set_target_ops (the_linux_target); |
dd373349 | 7455 | |
aa7c7447 | 7456 | linux_ptrace_init_warnings (); |
1b919490 | 7457 | linux_proc_init_warnings (); |
bd99dc85 PA |
7458 | |
7459 | sigchld_action.sa_handler = sigchld_handler; | |
7460 | sigemptyset (&sigchld_action.sa_mask); | |
7461 | sigchld_action.sa_flags = SA_RESTART; | |
7462 | sigaction (SIGCHLD, &sigchld_action, NULL); | |
3aee8918 PA |
7463 | |
7464 | initialize_low_arch (); | |
89245bc0 DB |
7465 | |
7466 | linux_check_ptrace_features (); | |
da6d8c04 | 7467 | } |