Commit | Line | Data |
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da6d8c04 | 1 | /* Low level interface to ptrace, for the remote server for GDB. |
b811d2c2 | 2 | Copyright (C) 1995-2020 Free Software Foundation, Inc. |
da6d8c04 DJ |
3 | |
4 | This file is part of GDB. | |
5 | ||
6 | This program is free software; you can redistribute it and/or modify | |
7 | it under the terms of the GNU General Public License as published by | |
a9762ec7 | 8 | the Free Software Foundation; either version 3 of the License, or |
da6d8c04 DJ |
9 | (at your option) any later version. |
10 | ||
11 | This program is distributed in the hope that it will be useful, | |
12 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
13 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
14 | GNU General Public License for more details. | |
15 | ||
16 | You should have received a copy of the GNU General Public License | |
a9762ec7 | 17 | along with this program. If not, see <http://www.gnu.org/licenses/>. */ |
da6d8c04 DJ |
18 | |
19 | #include "server.h" | |
58caa3dc | 20 | #include "linux-low.h" |
125f8a3d | 21 | #include "nat/linux-osdata.h" |
268a13a5 | 22 | #include "gdbsupport/agent.h" |
de0d863e | 23 | #include "tdesc.h" |
268a13a5 TT |
24 | #include "gdbsupport/rsp-low.h" |
25 | #include "gdbsupport/signals-state-save-restore.h" | |
96d7229d LM |
26 | #include "nat/linux-nat.h" |
27 | #include "nat/linux-waitpid.h" | |
268a13a5 | 28 | #include "gdbsupport/gdb_wait.h" |
5826e159 | 29 | #include "nat/gdb_ptrace.h" |
125f8a3d GB |
30 | #include "nat/linux-ptrace.h" |
31 | #include "nat/linux-procfs.h" | |
8cc73a39 | 32 | #include "nat/linux-personality.h" |
da6d8c04 DJ |
33 | #include <signal.h> |
34 | #include <sys/ioctl.h> | |
35 | #include <fcntl.h> | |
0a30fbc4 | 36 | #include <unistd.h> |
fd500816 | 37 | #include <sys/syscall.h> |
f9387fc3 | 38 | #include <sched.h> |
07e059b5 VP |
39 | #include <ctype.h> |
40 | #include <pwd.h> | |
41 | #include <sys/types.h> | |
42 | #include <dirent.h> | |
53ce3c39 | 43 | #include <sys/stat.h> |
efcbbd14 | 44 | #include <sys/vfs.h> |
1570b33e | 45 | #include <sys/uio.h> |
268a13a5 | 46 | #include "gdbsupport/filestuff.h" |
c144c7a0 | 47 | #include "tracepoint.h" |
276d4552 | 48 | #include <inttypes.h> |
268a13a5 | 49 | #include "gdbsupport/common-inferior.h" |
2090129c | 50 | #include "nat/fork-inferior.h" |
268a13a5 | 51 | #include "gdbsupport/environ.h" |
21987b9c | 52 | #include "gdbsupport/gdb-sigmask.h" |
268a13a5 | 53 | #include "gdbsupport/scoped_restore.h" |
957f3f49 DE |
54 | #ifndef ELFMAG0 |
55 | /* Don't include <linux/elf.h> here. If it got included by gdb_proc_service.h | |
56 | then ELFMAG0 will have been defined. If it didn't get included by | |
57 | gdb_proc_service.h then including it will likely introduce a duplicate | |
58 | definition of elf_fpregset_t. */ | |
59 | #include <elf.h> | |
60 | #endif | |
14d2069a | 61 | #include "nat/linux-namespaces.h" |
efcbbd14 | 62 | |
03583c20 UW |
63 | #ifdef HAVE_PERSONALITY |
64 | # include <sys/personality.h> | |
65 | # if !HAVE_DECL_ADDR_NO_RANDOMIZE | |
66 | # define ADDR_NO_RANDOMIZE 0x0040000 | |
67 | # endif | |
68 | #endif | |
69 | ||
fd462a61 DJ |
70 | #ifndef O_LARGEFILE |
71 | #define O_LARGEFILE 0 | |
72 | #endif | |
1a981360 | 73 | |
69f4c9cc AH |
74 | #ifndef AT_HWCAP2 |
75 | #define AT_HWCAP2 26 | |
76 | #endif | |
77 | ||
db0dfaa0 LM |
78 | /* Some targets did not define these ptrace constants from the start, |
79 | so gdbserver defines them locally here. In the future, these may | |
80 | be removed after they are added to asm/ptrace.h. */ | |
81 | #if !(defined(PT_TEXT_ADDR) \ | |
82 | || defined(PT_DATA_ADDR) \ | |
83 | || defined(PT_TEXT_END_ADDR)) | |
84 | #if defined(__mcoldfire__) | |
85 | /* These are still undefined in 3.10 kernels. */ | |
86 | #define PT_TEXT_ADDR 49*4 | |
87 | #define PT_DATA_ADDR 50*4 | |
88 | #define PT_TEXT_END_ADDR 51*4 | |
89 | /* BFIN already defines these since at least 2.6.32 kernels. */ | |
90 | #elif defined(BFIN) | |
91 | #define PT_TEXT_ADDR 220 | |
92 | #define PT_TEXT_END_ADDR 224 | |
93 | #define PT_DATA_ADDR 228 | |
94 | /* These are still undefined in 3.10 kernels. */ | |
95 | #elif defined(__TMS320C6X__) | |
96 | #define PT_TEXT_ADDR (0x10000*4) | |
97 | #define PT_DATA_ADDR (0x10004*4) | |
98 | #define PT_TEXT_END_ADDR (0x10008*4) | |
99 | #endif | |
100 | #endif | |
101 | ||
5203ae1e TBA |
102 | #if (defined(__UCLIBC__) \ |
103 | && defined(HAS_NOMMU) \ | |
104 | && defined(PT_TEXT_ADDR) \ | |
105 | && defined(PT_DATA_ADDR) \ | |
106 | && defined(PT_TEXT_END_ADDR)) | |
107 | #define SUPPORTS_READ_OFFSETS | |
108 | #endif | |
109 | ||
9accd112 | 110 | #ifdef HAVE_LINUX_BTRACE |
125f8a3d | 111 | # include "nat/linux-btrace.h" |
268a13a5 | 112 | # include "gdbsupport/btrace-common.h" |
9accd112 MM |
113 | #endif |
114 | ||
8365dcf5 TJB |
115 | #ifndef HAVE_ELF32_AUXV_T |
116 | /* Copied from glibc's elf.h. */ | |
117 | typedef struct | |
118 | { | |
119 | uint32_t a_type; /* Entry type */ | |
120 | union | |
121 | { | |
122 | uint32_t a_val; /* Integer value */ | |
123 | /* We use to have pointer elements added here. We cannot do that, | |
124 | though, since it does not work when using 32-bit definitions | |
125 | on 64-bit platforms and vice versa. */ | |
126 | } a_un; | |
127 | } Elf32_auxv_t; | |
128 | #endif | |
129 | ||
130 | #ifndef HAVE_ELF64_AUXV_T | |
131 | /* Copied from glibc's elf.h. */ | |
132 | typedef struct | |
133 | { | |
134 | uint64_t a_type; /* Entry type */ | |
135 | union | |
136 | { | |
137 | uint64_t a_val; /* Integer value */ | |
138 | /* We use to have pointer elements added here. We cannot do that, | |
139 | though, since it does not work when using 32-bit definitions | |
140 | on 64-bit platforms and vice versa. */ | |
141 | } a_un; | |
142 | } Elf64_auxv_t; | |
143 | #endif | |
144 | ||
ded48a5e YQ |
145 | /* Does the current host support PTRACE_GETREGSET? */ |
146 | int have_ptrace_getregset = -1; | |
147 | ||
cff068da GB |
148 | /* LWP accessors. */ |
149 | ||
150 | /* See nat/linux-nat.h. */ | |
151 | ||
152 | ptid_t | |
153 | ptid_of_lwp (struct lwp_info *lwp) | |
154 | { | |
155 | return ptid_of (get_lwp_thread (lwp)); | |
156 | } | |
157 | ||
158 | /* See nat/linux-nat.h. */ | |
159 | ||
4b134ca1 GB |
160 | void |
161 | lwp_set_arch_private_info (struct lwp_info *lwp, | |
162 | struct arch_lwp_info *info) | |
163 | { | |
164 | lwp->arch_private = info; | |
165 | } | |
166 | ||
167 | /* See nat/linux-nat.h. */ | |
168 | ||
169 | struct arch_lwp_info * | |
170 | lwp_arch_private_info (struct lwp_info *lwp) | |
171 | { | |
172 | return lwp->arch_private; | |
173 | } | |
174 | ||
175 | /* See nat/linux-nat.h. */ | |
176 | ||
cff068da GB |
177 | int |
178 | lwp_is_stopped (struct lwp_info *lwp) | |
179 | { | |
180 | return lwp->stopped; | |
181 | } | |
182 | ||
183 | /* See nat/linux-nat.h. */ | |
184 | ||
185 | enum target_stop_reason | |
186 | lwp_stop_reason (struct lwp_info *lwp) | |
187 | { | |
188 | return lwp->stop_reason; | |
189 | } | |
190 | ||
0e00e962 AA |
191 | /* See nat/linux-nat.h. */ |
192 | ||
193 | int | |
194 | lwp_is_stepping (struct lwp_info *lwp) | |
195 | { | |
196 | return lwp->stepping; | |
197 | } | |
198 | ||
05044653 PA |
199 | /* A list of all unknown processes which receive stop signals. Some |
200 | other process will presumably claim each of these as forked | |
201 | children momentarily. */ | |
24a09b5f | 202 | |
05044653 PA |
203 | struct simple_pid_list |
204 | { | |
205 | /* The process ID. */ | |
206 | int pid; | |
207 | ||
208 | /* The status as reported by waitpid. */ | |
209 | int status; | |
210 | ||
211 | /* Next in chain. */ | |
212 | struct simple_pid_list *next; | |
213 | }; | |
214 | struct simple_pid_list *stopped_pids; | |
215 | ||
216 | /* Trivial list manipulation functions to keep track of a list of new | |
217 | stopped processes. */ | |
218 | ||
219 | static void | |
220 | add_to_pid_list (struct simple_pid_list **listp, int pid, int status) | |
221 | { | |
8d749320 | 222 | struct simple_pid_list *new_pid = XNEW (struct simple_pid_list); |
05044653 PA |
223 | |
224 | new_pid->pid = pid; | |
225 | new_pid->status = status; | |
226 | new_pid->next = *listp; | |
227 | *listp = new_pid; | |
228 | } | |
229 | ||
230 | static int | |
231 | pull_pid_from_list (struct simple_pid_list **listp, int pid, int *statusp) | |
232 | { | |
233 | struct simple_pid_list **p; | |
234 | ||
235 | for (p = listp; *p != NULL; p = &(*p)->next) | |
236 | if ((*p)->pid == pid) | |
237 | { | |
238 | struct simple_pid_list *next = (*p)->next; | |
239 | ||
240 | *statusp = (*p)->status; | |
241 | xfree (*p); | |
242 | *p = next; | |
243 | return 1; | |
244 | } | |
245 | return 0; | |
246 | } | |
24a09b5f | 247 | |
bde24c0a PA |
248 | enum stopping_threads_kind |
249 | { | |
250 | /* Not stopping threads presently. */ | |
251 | NOT_STOPPING_THREADS, | |
252 | ||
253 | /* Stopping threads. */ | |
254 | STOPPING_THREADS, | |
255 | ||
256 | /* Stopping and suspending threads. */ | |
257 | STOPPING_AND_SUSPENDING_THREADS | |
258 | }; | |
259 | ||
260 | /* This is set while stop_all_lwps is in effect. */ | |
261 | enum stopping_threads_kind stopping_threads = NOT_STOPPING_THREADS; | |
0d62e5e8 DJ |
262 | |
263 | /* FIXME make into a target method? */ | |
24a09b5f | 264 | int using_threads = 1; |
24a09b5f | 265 | |
fa593d66 PA |
266 | /* True if we're presently stabilizing threads (moving them out of |
267 | jump pads). */ | |
268 | static int stabilizing_threads; | |
269 | ||
f50bf8e5 | 270 | static void unsuspend_all_lwps (struct lwp_info *except); |
95954743 | 271 | static void mark_lwp_dead (struct lwp_info *lwp, int wstat); |
00db26fa | 272 | static int lwp_is_marked_dead (struct lwp_info *lwp); |
d50171e4 | 273 | static int kill_lwp (unsigned long lwpid, int signo); |
863d01bd | 274 | static void enqueue_pending_signal (struct lwp_info *lwp, int signal, siginfo_t *info); |
ece66d65 | 275 | static int linux_low_ptrace_options (int attached); |
ced2dffb | 276 | static int check_ptrace_stopped_lwp_gone (struct lwp_info *lp); |
d50171e4 | 277 | |
582511be PA |
278 | /* When the event-loop is doing a step-over, this points at the thread |
279 | being stepped. */ | |
280 | ptid_t step_over_bkpt; | |
281 | ||
bf9ae9d8 TBA |
282 | bool |
283 | linux_process_target::low_supports_breakpoints () | |
284 | { | |
285 | return false; | |
286 | } | |
d50171e4 | 287 | |
bf9ae9d8 TBA |
288 | CORE_ADDR |
289 | linux_process_target::low_get_pc (regcache *regcache) | |
290 | { | |
291 | return 0; | |
292 | } | |
293 | ||
294 | void | |
295 | linux_process_target::low_set_pc (regcache *regcache, CORE_ADDR newpc) | |
d50171e4 | 296 | { |
bf9ae9d8 | 297 | gdb_assert_not_reached ("linux target op low_set_pc is not implemented"); |
d50171e4 | 298 | } |
0d62e5e8 | 299 | |
7582c77c TBA |
300 | std::vector<CORE_ADDR> |
301 | linux_process_target::low_get_next_pcs (regcache *regcache) | |
302 | { | |
303 | gdb_assert_not_reached ("linux target op low_get_next_pcs is not " | |
304 | "implemented"); | |
305 | } | |
306 | ||
d4807ea2 TBA |
307 | int |
308 | linux_process_target::low_decr_pc_after_break () | |
309 | { | |
310 | return 0; | |
311 | } | |
312 | ||
c2d6af84 PA |
313 | /* True if LWP is stopped in its stepping range. */ |
314 | ||
315 | static int | |
316 | lwp_in_step_range (struct lwp_info *lwp) | |
317 | { | |
318 | CORE_ADDR pc = lwp->stop_pc; | |
319 | ||
320 | return (pc >= lwp->step_range_start && pc < lwp->step_range_end); | |
321 | } | |
322 | ||
0d62e5e8 DJ |
323 | struct pending_signals |
324 | { | |
325 | int signal; | |
32ca6d61 | 326 | siginfo_t info; |
0d62e5e8 DJ |
327 | struct pending_signals *prev; |
328 | }; | |
611cb4a5 | 329 | |
bd99dc85 PA |
330 | /* The read/write ends of the pipe registered as waitable file in the |
331 | event loop. */ | |
332 | static int linux_event_pipe[2] = { -1, -1 }; | |
333 | ||
334 | /* True if we're currently in async mode. */ | |
335 | #define target_is_async_p() (linux_event_pipe[0] != -1) | |
336 | ||
02fc4de7 | 337 | static void send_sigstop (struct lwp_info *lwp); |
bd99dc85 | 338 | |
d0722149 DE |
339 | /* Return non-zero if HEADER is a 64-bit ELF file. */ |
340 | ||
341 | static int | |
214d508e | 342 | elf_64_header_p (const Elf64_Ehdr *header, unsigned int *machine) |
d0722149 | 343 | { |
214d508e L |
344 | if (header->e_ident[EI_MAG0] == ELFMAG0 |
345 | && header->e_ident[EI_MAG1] == ELFMAG1 | |
346 | && header->e_ident[EI_MAG2] == ELFMAG2 | |
347 | && header->e_ident[EI_MAG3] == ELFMAG3) | |
348 | { | |
349 | *machine = header->e_machine; | |
350 | return header->e_ident[EI_CLASS] == ELFCLASS64; | |
351 | ||
352 | } | |
353 | *machine = EM_NONE; | |
354 | return -1; | |
d0722149 DE |
355 | } |
356 | ||
357 | /* Return non-zero if FILE is a 64-bit ELF file, | |
358 | zero if the file is not a 64-bit ELF file, | |
359 | and -1 if the file is not accessible or doesn't exist. */ | |
360 | ||
be07f1a2 | 361 | static int |
214d508e | 362 | elf_64_file_p (const char *file, unsigned int *machine) |
d0722149 | 363 | { |
957f3f49 | 364 | Elf64_Ehdr header; |
d0722149 DE |
365 | int fd; |
366 | ||
367 | fd = open (file, O_RDONLY); | |
368 | if (fd < 0) | |
369 | return -1; | |
370 | ||
371 | if (read (fd, &header, sizeof (header)) != sizeof (header)) | |
372 | { | |
373 | close (fd); | |
374 | return 0; | |
375 | } | |
376 | close (fd); | |
377 | ||
214d508e | 378 | return elf_64_header_p (&header, machine); |
d0722149 DE |
379 | } |
380 | ||
be07f1a2 PA |
381 | /* Accepts an integer PID; Returns true if the executable PID is |
382 | running is a 64-bit ELF file.. */ | |
383 | ||
384 | int | |
214d508e | 385 | linux_pid_exe_is_elf_64_file (int pid, unsigned int *machine) |
be07f1a2 | 386 | { |
d8d2a3ee | 387 | char file[PATH_MAX]; |
be07f1a2 PA |
388 | |
389 | sprintf (file, "/proc/%d/exe", pid); | |
214d508e | 390 | return elf_64_file_p (file, machine); |
be07f1a2 PA |
391 | } |
392 | ||
fd000fb3 TBA |
393 | void |
394 | linux_process_target::delete_lwp (lwp_info *lwp) | |
bd99dc85 | 395 | { |
fa96cb38 PA |
396 | struct thread_info *thr = get_lwp_thread (lwp); |
397 | ||
398 | if (debug_threads) | |
399 | debug_printf ("deleting %ld\n", lwpid_of (thr)); | |
400 | ||
401 | remove_thread (thr); | |
466eecee | 402 | |
fd000fb3 | 403 | low_delete_thread (lwp->arch_private); |
466eecee | 404 | |
bd99dc85 PA |
405 | free (lwp); |
406 | } | |
407 | ||
fd000fb3 TBA |
408 | void |
409 | linux_process_target::low_delete_thread (arch_lwp_info *info) | |
410 | { | |
411 | /* Default implementation should be overridden if architecture-specific | |
412 | info is being used. */ | |
413 | gdb_assert (info == nullptr); | |
414 | } | |
95954743 | 415 | |
fd000fb3 TBA |
416 | process_info * |
417 | linux_process_target::add_linux_process (int pid, int attached) | |
95954743 PA |
418 | { |
419 | struct process_info *proc; | |
420 | ||
95954743 | 421 | proc = add_process (pid, attached); |
8d749320 | 422 | proc->priv = XCNEW (struct process_info_private); |
95954743 | 423 | |
fd000fb3 | 424 | proc->priv->arch_private = low_new_process (); |
aa5ca48f | 425 | |
95954743 PA |
426 | return proc; |
427 | } | |
428 | ||
fd000fb3 TBA |
429 | arch_process_info * |
430 | linux_process_target::low_new_process () | |
431 | { | |
432 | return nullptr; | |
433 | } | |
434 | ||
435 | void | |
436 | linux_process_target::low_delete_process (arch_process_info *info) | |
437 | { | |
438 | /* Default implementation must be overridden if architecture-specific | |
439 | info exists. */ | |
440 | gdb_assert (info == nullptr); | |
441 | } | |
442 | ||
443 | void | |
444 | linux_process_target::low_new_fork (process_info *parent, process_info *child) | |
445 | { | |
446 | /* Nop. */ | |
447 | } | |
448 | ||
797bcff5 TBA |
449 | void |
450 | linux_process_target::arch_setup_thread (thread_info *thread) | |
94585166 DB |
451 | { |
452 | struct thread_info *saved_thread; | |
453 | ||
454 | saved_thread = current_thread; | |
455 | current_thread = thread; | |
456 | ||
797bcff5 | 457 | low_arch_setup (); |
94585166 DB |
458 | |
459 | current_thread = saved_thread; | |
460 | } | |
461 | ||
d16f3f6c TBA |
462 | int |
463 | linux_process_target::handle_extended_wait (lwp_info **orig_event_lwp, | |
464 | int wstat) | |
24a09b5f | 465 | { |
c12a5089 | 466 | client_state &cs = get_client_state (); |
94585166 | 467 | struct lwp_info *event_lwp = *orig_event_lwp; |
89a5711c | 468 | int event = linux_ptrace_get_extended_event (wstat); |
de0d863e | 469 | struct thread_info *event_thr = get_lwp_thread (event_lwp); |
54a0b537 | 470 | struct lwp_info *new_lwp; |
24a09b5f | 471 | |
65706a29 PA |
472 | gdb_assert (event_lwp->waitstatus.kind == TARGET_WAITKIND_IGNORE); |
473 | ||
82075af2 JS |
474 | /* All extended events we currently use are mid-syscall. Only |
475 | PTRACE_EVENT_STOP is delivered more like a signal-stop, but | |
476 | you have to be using PTRACE_SEIZE to get that. */ | |
477 | event_lwp->syscall_state = TARGET_WAITKIND_SYSCALL_ENTRY; | |
478 | ||
c269dbdb DB |
479 | if ((event == PTRACE_EVENT_FORK) || (event == PTRACE_EVENT_VFORK) |
480 | || (event == PTRACE_EVENT_CLONE)) | |
24a09b5f | 481 | { |
95954743 | 482 | ptid_t ptid; |
24a09b5f | 483 | unsigned long new_pid; |
05044653 | 484 | int ret, status; |
24a09b5f | 485 | |
de0d863e | 486 | /* Get the pid of the new lwp. */ |
d86d4aaf | 487 | ptrace (PTRACE_GETEVENTMSG, lwpid_of (event_thr), (PTRACE_TYPE_ARG3) 0, |
56f7af9c | 488 | &new_pid); |
24a09b5f DJ |
489 | |
490 | /* If we haven't already seen the new PID stop, wait for it now. */ | |
05044653 | 491 | if (!pull_pid_from_list (&stopped_pids, new_pid, &status)) |
24a09b5f DJ |
492 | { |
493 | /* The new child has a pending SIGSTOP. We can't affect it until it | |
494 | hits the SIGSTOP, but we're already attached. */ | |
495 | ||
97438e3f | 496 | ret = my_waitpid (new_pid, &status, __WALL); |
24a09b5f DJ |
497 | |
498 | if (ret == -1) | |
499 | perror_with_name ("waiting for new child"); | |
500 | else if (ret != new_pid) | |
501 | warning ("wait returned unexpected PID %d", ret); | |
da5898ce | 502 | else if (!WIFSTOPPED (status)) |
24a09b5f DJ |
503 | warning ("wait returned unexpected status 0x%x", status); |
504 | } | |
505 | ||
c269dbdb | 506 | if (event == PTRACE_EVENT_FORK || event == PTRACE_EVENT_VFORK) |
de0d863e DB |
507 | { |
508 | struct process_info *parent_proc; | |
509 | struct process_info *child_proc; | |
510 | struct lwp_info *child_lwp; | |
bfacd19d | 511 | struct thread_info *child_thr; |
de0d863e DB |
512 | struct target_desc *tdesc; |
513 | ||
fd79271b | 514 | ptid = ptid_t (new_pid, new_pid, 0); |
de0d863e DB |
515 | |
516 | if (debug_threads) | |
517 | { | |
518 | debug_printf ("HEW: Got fork event from LWP %ld, " | |
519 | "new child is %d\n", | |
e38504b3 | 520 | ptid_of (event_thr).lwp (), |
e99b03dc | 521 | ptid.pid ()); |
de0d863e DB |
522 | } |
523 | ||
524 | /* Add the new process to the tables and clone the breakpoint | |
525 | lists of the parent. We need to do this even if the new process | |
526 | will be detached, since we will need the process object and the | |
527 | breakpoints to remove any breakpoints from memory when we | |
528 | detach, and the client side will access registers. */ | |
fd000fb3 | 529 | child_proc = add_linux_process (new_pid, 0); |
de0d863e DB |
530 | gdb_assert (child_proc != NULL); |
531 | child_lwp = add_lwp (ptid); | |
532 | gdb_assert (child_lwp != NULL); | |
533 | child_lwp->stopped = 1; | |
bfacd19d DB |
534 | child_lwp->must_set_ptrace_flags = 1; |
535 | child_lwp->status_pending_p = 0; | |
536 | child_thr = get_lwp_thread (child_lwp); | |
537 | child_thr->last_resume_kind = resume_stop; | |
998d452a PA |
538 | child_thr->last_status.kind = TARGET_WAITKIND_STOPPED; |
539 | ||
863d01bd | 540 | /* If we're suspending all threads, leave this one suspended |
0f8288ae YQ |
541 | too. If the fork/clone parent is stepping over a breakpoint, |
542 | all other threads have been suspended already. Leave the | |
543 | child suspended too. */ | |
544 | if (stopping_threads == STOPPING_AND_SUSPENDING_THREADS | |
545 | || event_lwp->bp_reinsert != 0) | |
863d01bd PA |
546 | { |
547 | if (debug_threads) | |
548 | debug_printf ("HEW: leaving child suspended\n"); | |
549 | child_lwp->suspended = 1; | |
550 | } | |
551 | ||
de0d863e DB |
552 | parent_proc = get_thread_process (event_thr); |
553 | child_proc->attached = parent_proc->attached; | |
2e7b624b YQ |
554 | |
555 | if (event_lwp->bp_reinsert != 0 | |
7582c77c | 556 | && supports_software_single_step () |
2e7b624b YQ |
557 | && event == PTRACE_EVENT_VFORK) |
558 | { | |
3b9a79ef YQ |
559 | /* If we leave single-step breakpoints there, child will |
560 | hit it, so uninsert single-step breakpoints from parent | |
2e7b624b YQ |
561 | (and child). Once vfork child is done, reinsert |
562 | them back to parent. */ | |
3b9a79ef | 563 | uninsert_single_step_breakpoints (event_thr); |
2e7b624b YQ |
564 | } |
565 | ||
63c40ec7 | 566 | clone_all_breakpoints (child_thr, event_thr); |
de0d863e | 567 | |
cc397f3a | 568 | tdesc = allocate_target_description (); |
de0d863e DB |
569 | copy_target_description (tdesc, parent_proc->tdesc); |
570 | child_proc->tdesc = tdesc; | |
de0d863e | 571 | |
3a8a0396 | 572 | /* Clone arch-specific process data. */ |
fd000fb3 | 573 | low_new_fork (parent_proc, child_proc); |
3a8a0396 | 574 | |
de0d863e | 575 | /* Save fork info in the parent thread. */ |
c269dbdb DB |
576 | if (event == PTRACE_EVENT_FORK) |
577 | event_lwp->waitstatus.kind = TARGET_WAITKIND_FORKED; | |
578 | else if (event == PTRACE_EVENT_VFORK) | |
579 | event_lwp->waitstatus.kind = TARGET_WAITKIND_VFORKED; | |
580 | ||
de0d863e | 581 | event_lwp->waitstatus.value.related_pid = ptid; |
c269dbdb | 582 | |
de0d863e DB |
583 | /* The status_pending field contains bits denoting the |
584 | extended event, so when the pending event is handled, | |
585 | the handler will look at lwp->waitstatus. */ | |
586 | event_lwp->status_pending_p = 1; | |
587 | event_lwp->status_pending = wstat; | |
588 | ||
5a04c4cf PA |
589 | /* Link the threads until the parent event is passed on to |
590 | higher layers. */ | |
591 | event_lwp->fork_relative = child_lwp; | |
592 | child_lwp->fork_relative = event_lwp; | |
593 | ||
3b9a79ef YQ |
594 | /* If the parent thread is doing step-over with single-step |
595 | breakpoints, the list of single-step breakpoints are cloned | |
2e7b624b YQ |
596 | from the parent's. Remove them from the child process. |
597 | In case of vfork, we'll reinsert them back once vforked | |
598 | child is done. */ | |
8a81c5d7 | 599 | if (event_lwp->bp_reinsert != 0 |
7582c77c | 600 | && supports_software_single_step ()) |
8a81c5d7 | 601 | { |
8a81c5d7 YQ |
602 | /* The child process is forked and stopped, so it is safe |
603 | to access its memory without stopping all other threads | |
604 | from other processes. */ | |
3b9a79ef | 605 | delete_single_step_breakpoints (child_thr); |
8a81c5d7 | 606 | |
3b9a79ef YQ |
607 | gdb_assert (has_single_step_breakpoints (event_thr)); |
608 | gdb_assert (!has_single_step_breakpoints (child_thr)); | |
8a81c5d7 YQ |
609 | } |
610 | ||
de0d863e DB |
611 | /* Report the event. */ |
612 | return 0; | |
613 | } | |
614 | ||
fa96cb38 PA |
615 | if (debug_threads) |
616 | debug_printf ("HEW: Got clone event " | |
617 | "from LWP %ld, new child is LWP %ld\n", | |
618 | lwpid_of (event_thr), new_pid); | |
619 | ||
fd79271b | 620 | ptid = ptid_t (pid_of (event_thr), new_pid, 0); |
b3312d80 | 621 | new_lwp = add_lwp (ptid); |
24a09b5f | 622 | |
e27d73f6 | 623 | /* Either we're going to immediately resume the new thread |
df95181f | 624 | or leave it stopped. resume_one_lwp is a nop if it |
e27d73f6 | 625 | thinks the thread is currently running, so set this first |
df95181f | 626 | before calling resume_one_lwp. */ |
e27d73f6 DE |
627 | new_lwp->stopped = 1; |
628 | ||
0f8288ae YQ |
629 | /* If we're suspending all threads, leave this one suspended |
630 | too. If the fork/clone parent is stepping over a breakpoint, | |
631 | all other threads have been suspended already. Leave the | |
632 | child suspended too. */ | |
633 | if (stopping_threads == STOPPING_AND_SUSPENDING_THREADS | |
634 | || event_lwp->bp_reinsert != 0) | |
bde24c0a PA |
635 | new_lwp->suspended = 1; |
636 | ||
da5898ce DJ |
637 | /* Normally we will get the pending SIGSTOP. But in some cases |
638 | we might get another signal delivered to the group first. | |
f21cc1a2 | 639 | If we do get another signal, be sure not to lose it. */ |
20ba1ce6 | 640 | if (WSTOPSIG (status) != SIGSTOP) |
da5898ce | 641 | { |
54a0b537 | 642 | new_lwp->stop_expected = 1; |
20ba1ce6 PA |
643 | new_lwp->status_pending_p = 1; |
644 | new_lwp->status_pending = status; | |
da5898ce | 645 | } |
c12a5089 | 646 | else if (cs.report_thread_events) |
65706a29 PA |
647 | { |
648 | new_lwp->waitstatus.kind = TARGET_WAITKIND_THREAD_CREATED; | |
649 | new_lwp->status_pending_p = 1; | |
650 | new_lwp->status_pending = status; | |
651 | } | |
de0d863e | 652 | |
a0aad537 | 653 | #ifdef USE_THREAD_DB |
94c207e0 | 654 | thread_db_notice_clone (event_thr, ptid); |
a0aad537 | 655 | #endif |
86299109 | 656 | |
de0d863e DB |
657 | /* Don't report the event. */ |
658 | return 1; | |
24a09b5f | 659 | } |
c269dbdb DB |
660 | else if (event == PTRACE_EVENT_VFORK_DONE) |
661 | { | |
662 | event_lwp->waitstatus.kind = TARGET_WAITKIND_VFORK_DONE; | |
663 | ||
7582c77c | 664 | if (event_lwp->bp_reinsert != 0 && supports_software_single_step ()) |
2e7b624b | 665 | { |
3b9a79ef | 666 | reinsert_single_step_breakpoints (event_thr); |
2e7b624b | 667 | |
3b9a79ef | 668 | gdb_assert (has_single_step_breakpoints (event_thr)); |
2e7b624b YQ |
669 | } |
670 | ||
c269dbdb DB |
671 | /* Report the event. */ |
672 | return 0; | |
673 | } | |
c12a5089 | 674 | else if (event == PTRACE_EVENT_EXEC && cs.report_exec_events) |
94585166 DB |
675 | { |
676 | struct process_info *proc; | |
f27866ba | 677 | std::vector<int> syscalls_to_catch; |
94585166 DB |
678 | ptid_t event_ptid; |
679 | pid_t event_pid; | |
680 | ||
681 | if (debug_threads) | |
682 | { | |
683 | debug_printf ("HEW: Got exec event from LWP %ld\n", | |
684 | lwpid_of (event_thr)); | |
685 | } | |
686 | ||
687 | /* Get the event ptid. */ | |
688 | event_ptid = ptid_of (event_thr); | |
e99b03dc | 689 | event_pid = event_ptid.pid (); |
94585166 | 690 | |
82075af2 | 691 | /* Save the syscall list from the execing process. */ |
94585166 | 692 | proc = get_thread_process (event_thr); |
f27866ba | 693 | syscalls_to_catch = std::move (proc->syscalls_to_catch); |
82075af2 JS |
694 | |
695 | /* Delete the execing process and all its threads. */ | |
d16f3f6c | 696 | mourn (proc); |
94585166 DB |
697 | current_thread = NULL; |
698 | ||
699 | /* Create a new process/lwp/thread. */ | |
fd000fb3 | 700 | proc = add_linux_process (event_pid, 0); |
94585166 DB |
701 | event_lwp = add_lwp (event_ptid); |
702 | event_thr = get_lwp_thread (event_lwp); | |
703 | gdb_assert (current_thread == event_thr); | |
797bcff5 | 704 | arch_setup_thread (event_thr); |
94585166 DB |
705 | |
706 | /* Set the event status. */ | |
707 | event_lwp->waitstatus.kind = TARGET_WAITKIND_EXECD; | |
708 | event_lwp->waitstatus.value.execd_pathname | |
709 | = xstrdup (linux_proc_pid_to_exec_file (lwpid_of (event_thr))); | |
710 | ||
711 | /* Mark the exec status as pending. */ | |
712 | event_lwp->stopped = 1; | |
713 | event_lwp->status_pending_p = 1; | |
714 | event_lwp->status_pending = wstat; | |
715 | event_thr->last_resume_kind = resume_continue; | |
716 | event_thr->last_status.kind = TARGET_WAITKIND_IGNORE; | |
717 | ||
82075af2 JS |
718 | /* Update syscall state in the new lwp, effectively mid-syscall too. */ |
719 | event_lwp->syscall_state = TARGET_WAITKIND_SYSCALL_ENTRY; | |
720 | ||
721 | /* Restore the list to catch. Don't rely on the client, which is free | |
722 | to avoid sending a new list when the architecture doesn't change. | |
723 | Also, for ANY_SYSCALL, the architecture doesn't really matter. */ | |
f27866ba | 724 | proc->syscalls_to_catch = std::move (syscalls_to_catch); |
82075af2 | 725 | |
94585166 DB |
726 | /* Report the event. */ |
727 | *orig_event_lwp = event_lwp; | |
728 | return 0; | |
729 | } | |
de0d863e DB |
730 | |
731 | internal_error (__FILE__, __LINE__, _("unknown ptrace event %d"), event); | |
24a09b5f DJ |
732 | } |
733 | ||
df95181f TBA |
734 | CORE_ADDR |
735 | linux_process_target::get_pc (lwp_info *lwp) | |
d50171e4 | 736 | { |
0bfdf32f | 737 | struct thread_info *saved_thread; |
d50171e4 PA |
738 | struct regcache *regcache; |
739 | CORE_ADDR pc; | |
740 | ||
bf9ae9d8 | 741 | if (!low_supports_breakpoints ()) |
d50171e4 PA |
742 | return 0; |
743 | ||
0bfdf32f GB |
744 | saved_thread = current_thread; |
745 | current_thread = get_lwp_thread (lwp); | |
d50171e4 | 746 | |
0bfdf32f | 747 | regcache = get_thread_regcache (current_thread, 1); |
bf9ae9d8 | 748 | pc = low_get_pc (regcache); |
d50171e4 PA |
749 | |
750 | if (debug_threads) | |
87ce2a04 | 751 | debug_printf ("pc is 0x%lx\n", (long) pc); |
d50171e4 | 752 | |
0bfdf32f | 753 | current_thread = saved_thread; |
d50171e4 PA |
754 | return pc; |
755 | } | |
756 | ||
9eedd27d TBA |
757 | void |
758 | linux_process_target::get_syscall_trapinfo (lwp_info *lwp, int *sysno) | |
82075af2 JS |
759 | { |
760 | struct thread_info *saved_thread; | |
761 | struct regcache *regcache; | |
762 | ||
82075af2 JS |
763 | saved_thread = current_thread; |
764 | current_thread = get_lwp_thread (lwp); | |
765 | ||
766 | regcache = get_thread_regcache (current_thread, 1); | |
9eedd27d | 767 | low_get_syscall_trapinfo (regcache, sysno); |
82075af2 JS |
768 | |
769 | if (debug_threads) | |
4cc32bec | 770 | debug_printf ("get_syscall_trapinfo sysno %d\n", *sysno); |
82075af2 JS |
771 | |
772 | current_thread = saved_thread; | |
773 | } | |
774 | ||
9eedd27d TBA |
775 | void |
776 | linux_process_target::low_get_syscall_trapinfo (regcache *regcache, int *sysno) | |
777 | { | |
778 | /* By default, report an unknown system call number. */ | |
779 | *sysno = UNKNOWN_SYSCALL; | |
780 | } | |
781 | ||
df95181f TBA |
782 | bool |
783 | linux_process_target::save_stop_reason (lwp_info *lwp) | |
0d62e5e8 | 784 | { |
582511be PA |
785 | CORE_ADDR pc; |
786 | CORE_ADDR sw_breakpoint_pc; | |
787 | struct thread_info *saved_thread; | |
3e572f71 PA |
788 | #if USE_SIGTRAP_SIGINFO |
789 | siginfo_t siginfo; | |
790 | #endif | |
d50171e4 | 791 | |
bf9ae9d8 | 792 | if (!low_supports_breakpoints ()) |
df95181f | 793 | return false; |
0d62e5e8 | 794 | |
582511be | 795 | pc = get_pc (lwp); |
d4807ea2 | 796 | sw_breakpoint_pc = pc - low_decr_pc_after_break (); |
d50171e4 | 797 | |
582511be PA |
798 | /* breakpoint_at reads from the current thread. */ |
799 | saved_thread = current_thread; | |
800 | current_thread = get_lwp_thread (lwp); | |
47c0c975 | 801 | |
3e572f71 PA |
802 | #if USE_SIGTRAP_SIGINFO |
803 | if (ptrace (PTRACE_GETSIGINFO, lwpid_of (current_thread), | |
804 | (PTRACE_TYPE_ARG3) 0, &siginfo) == 0) | |
805 | { | |
806 | if (siginfo.si_signo == SIGTRAP) | |
807 | { | |
e7ad2f14 PA |
808 | if (GDB_ARCH_IS_TRAP_BRKPT (siginfo.si_code) |
809 | && GDB_ARCH_IS_TRAP_HWBKPT (siginfo.si_code)) | |
3e572f71 | 810 | { |
e7ad2f14 PA |
811 | /* The si_code is ambiguous on this arch -- check debug |
812 | registers. */ | |
813 | if (!check_stopped_by_watchpoint (lwp)) | |
814 | lwp->stop_reason = TARGET_STOPPED_BY_SW_BREAKPOINT; | |
815 | } | |
816 | else if (GDB_ARCH_IS_TRAP_BRKPT (siginfo.si_code)) | |
817 | { | |
818 | /* If we determine the LWP stopped for a SW breakpoint, | |
819 | trust it. Particularly don't check watchpoint | |
820 | registers, because at least on s390, we'd find | |
821 | stopped-by-watchpoint as long as there's a watchpoint | |
822 | set. */ | |
3e572f71 | 823 | lwp->stop_reason = TARGET_STOPPED_BY_SW_BREAKPOINT; |
3e572f71 | 824 | } |
e7ad2f14 | 825 | else if (GDB_ARCH_IS_TRAP_HWBKPT (siginfo.si_code)) |
3e572f71 | 826 | { |
e7ad2f14 PA |
827 | /* This can indicate either a hardware breakpoint or |
828 | hardware watchpoint. Check debug registers. */ | |
829 | if (!check_stopped_by_watchpoint (lwp)) | |
830 | lwp->stop_reason = TARGET_STOPPED_BY_HW_BREAKPOINT; | |
3e572f71 | 831 | } |
2bf6fb9d PA |
832 | else if (siginfo.si_code == TRAP_TRACE) |
833 | { | |
e7ad2f14 PA |
834 | /* We may have single stepped an instruction that |
835 | triggered a watchpoint. In that case, on some | |
836 | architectures (such as x86), instead of TRAP_HWBKPT, | |
837 | si_code indicates TRAP_TRACE, and we need to check | |
838 | the debug registers separately. */ | |
839 | if (!check_stopped_by_watchpoint (lwp)) | |
840 | lwp->stop_reason = TARGET_STOPPED_BY_SINGLE_STEP; | |
2bf6fb9d | 841 | } |
3e572f71 PA |
842 | } |
843 | } | |
844 | #else | |
582511be PA |
845 | /* We may have just stepped a breakpoint instruction. E.g., in |
846 | non-stop mode, GDB first tells the thread A to step a range, and | |
847 | then the user inserts a breakpoint inside the range. In that | |
8090aef2 PA |
848 | case we need to report the breakpoint PC. */ |
849 | if ((!lwp->stepping || lwp->stop_pc == sw_breakpoint_pc) | |
d7146cda | 850 | && low_breakpoint_at (sw_breakpoint_pc)) |
e7ad2f14 PA |
851 | lwp->stop_reason = TARGET_STOPPED_BY_SW_BREAKPOINT; |
852 | ||
853 | if (hardware_breakpoint_inserted_here (pc)) | |
854 | lwp->stop_reason = TARGET_STOPPED_BY_HW_BREAKPOINT; | |
855 | ||
856 | if (lwp->stop_reason == TARGET_STOPPED_BY_NO_REASON) | |
857 | check_stopped_by_watchpoint (lwp); | |
858 | #endif | |
859 | ||
860 | if (lwp->stop_reason == TARGET_STOPPED_BY_SW_BREAKPOINT) | |
582511be PA |
861 | { |
862 | if (debug_threads) | |
863 | { | |
864 | struct thread_info *thr = get_lwp_thread (lwp); | |
865 | ||
866 | debug_printf ("CSBB: %s stopped by software breakpoint\n", | |
867 | target_pid_to_str (ptid_of (thr))); | |
868 | } | |
869 | ||
870 | /* Back up the PC if necessary. */ | |
871 | if (pc != sw_breakpoint_pc) | |
e7ad2f14 | 872 | { |
582511be PA |
873 | struct regcache *regcache |
874 | = get_thread_regcache (current_thread, 1); | |
bf9ae9d8 | 875 | low_set_pc (regcache, sw_breakpoint_pc); |
582511be PA |
876 | } |
877 | ||
e7ad2f14 PA |
878 | /* Update this so we record the correct stop PC below. */ |
879 | pc = sw_breakpoint_pc; | |
582511be | 880 | } |
e7ad2f14 | 881 | else if (lwp->stop_reason == TARGET_STOPPED_BY_HW_BREAKPOINT) |
582511be PA |
882 | { |
883 | if (debug_threads) | |
884 | { | |
885 | struct thread_info *thr = get_lwp_thread (lwp); | |
886 | ||
887 | debug_printf ("CSBB: %s stopped by hardware breakpoint\n", | |
888 | target_pid_to_str (ptid_of (thr))); | |
889 | } | |
e7ad2f14 PA |
890 | } |
891 | else if (lwp->stop_reason == TARGET_STOPPED_BY_WATCHPOINT) | |
892 | { | |
893 | if (debug_threads) | |
894 | { | |
895 | struct thread_info *thr = get_lwp_thread (lwp); | |
47c0c975 | 896 | |
e7ad2f14 PA |
897 | debug_printf ("CSBB: %s stopped by hardware watchpoint\n", |
898 | target_pid_to_str (ptid_of (thr))); | |
899 | } | |
582511be | 900 | } |
e7ad2f14 PA |
901 | else if (lwp->stop_reason == TARGET_STOPPED_BY_SINGLE_STEP) |
902 | { | |
903 | if (debug_threads) | |
904 | { | |
905 | struct thread_info *thr = get_lwp_thread (lwp); | |
582511be | 906 | |
e7ad2f14 PA |
907 | debug_printf ("CSBB: %s stopped by trace\n", |
908 | target_pid_to_str (ptid_of (thr))); | |
909 | } | |
910 | } | |
911 | ||
912 | lwp->stop_pc = pc; | |
582511be | 913 | current_thread = saved_thread; |
df95181f | 914 | return true; |
0d62e5e8 | 915 | } |
ce3a066d | 916 | |
fd000fb3 TBA |
917 | lwp_info * |
918 | linux_process_target::add_lwp (ptid_t ptid) | |
611cb4a5 | 919 | { |
54a0b537 | 920 | struct lwp_info *lwp; |
0d62e5e8 | 921 | |
8d749320 | 922 | lwp = XCNEW (struct lwp_info); |
00db26fa PA |
923 | |
924 | lwp->waitstatus.kind = TARGET_WAITKIND_IGNORE; | |
0d62e5e8 | 925 | |
754e3168 AH |
926 | lwp->thread = add_thread (ptid, lwp); |
927 | ||
fd000fb3 | 928 | low_new_thread (lwp); |
aa5ca48f | 929 | |
54a0b537 | 930 | return lwp; |
0d62e5e8 | 931 | } |
611cb4a5 | 932 | |
fd000fb3 TBA |
933 | void |
934 | linux_process_target::low_new_thread (lwp_info *info) | |
935 | { | |
936 | /* Nop. */ | |
937 | } | |
938 | ||
2090129c SDJ |
939 | /* Callback to be used when calling fork_inferior, responsible for |
940 | actually initiating the tracing of the inferior. */ | |
941 | ||
942 | static void | |
943 | linux_ptrace_fun () | |
944 | { | |
945 | if (ptrace (PTRACE_TRACEME, 0, (PTRACE_TYPE_ARG3) 0, | |
946 | (PTRACE_TYPE_ARG4) 0) < 0) | |
50fa3001 | 947 | trace_start_error_with_name ("ptrace"); |
2090129c SDJ |
948 | |
949 | if (setpgid (0, 0) < 0) | |
950 | trace_start_error_with_name ("setpgid"); | |
951 | ||
952 | /* If GDBserver is connected to gdb via stdio, redirect the inferior's | |
953 | stdout to stderr so that inferior i/o doesn't corrupt the connection. | |
954 | Also, redirect stdin to /dev/null. */ | |
955 | if (remote_connection_is_stdio ()) | |
956 | { | |
957 | if (close (0) < 0) | |
958 | trace_start_error_with_name ("close"); | |
959 | if (open ("/dev/null", O_RDONLY) < 0) | |
960 | trace_start_error_with_name ("open"); | |
961 | if (dup2 (2, 1) < 0) | |
962 | trace_start_error_with_name ("dup2"); | |
963 | if (write (2, "stdin/stdout redirected\n", | |
964 | sizeof ("stdin/stdout redirected\n") - 1) < 0) | |
965 | { | |
966 | /* Errors ignored. */; | |
967 | } | |
968 | } | |
969 | } | |
970 | ||
da6d8c04 | 971 | /* Start an inferior process and returns its pid. |
2090129c SDJ |
972 | PROGRAM is the name of the program to be started, and PROGRAM_ARGS |
973 | are its arguments. */ | |
da6d8c04 | 974 | |
15295543 TBA |
975 | int |
976 | linux_process_target::create_inferior (const char *program, | |
977 | const std::vector<char *> &program_args) | |
da6d8c04 | 978 | { |
c12a5089 | 979 | client_state &cs = get_client_state (); |
a6dbe5df | 980 | struct lwp_info *new_lwp; |
da6d8c04 | 981 | int pid; |
95954743 | 982 | ptid_t ptid; |
03583c20 | 983 | |
41272101 TT |
984 | { |
985 | maybe_disable_address_space_randomization restore_personality | |
c12a5089 | 986 | (cs.disable_randomization); |
41272101 TT |
987 | std::string str_program_args = stringify_argv (program_args); |
988 | ||
989 | pid = fork_inferior (program, | |
990 | str_program_args.c_str (), | |
991 | get_environ ()->envp (), linux_ptrace_fun, | |
992 | NULL, NULL, NULL, NULL); | |
993 | } | |
03583c20 | 994 | |
fd000fb3 | 995 | add_linux_process (pid, 0); |
95954743 | 996 | |
fd79271b | 997 | ptid = ptid_t (pid, pid, 0); |
95954743 | 998 | new_lwp = add_lwp (ptid); |
a6dbe5df | 999 | new_lwp->must_set_ptrace_flags = 1; |
611cb4a5 | 1000 | |
2090129c SDJ |
1001 | post_fork_inferior (pid, program); |
1002 | ||
a9fa9f7d | 1003 | return pid; |
da6d8c04 DJ |
1004 | } |
1005 | ||
ece66d65 JS |
1006 | /* Implement the post_create_inferior target_ops method. */ |
1007 | ||
6dee9afb TBA |
1008 | void |
1009 | linux_process_target::post_create_inferior () | |
ece66d65 JS |
1010 | { |
1011 | struct lwp_info *lwp = get_thread_lwp (current_thread); | |
1012 | ||
797bcff5 | 1013 | low_arch_setup (); |
ece66d65 JS |
1014 | |
1015 | if (lwp->must_set_ptrace_flags) | |
1016 | { | |
1017 | struct process_info *proc = current_process (); | |
1018 | int options = linux_low_ptrace_options (proc->attached); | |
1019 | ||
1020 | linux_enable_event_reporting (lwpid_of (current_thread), options); | |
1021 | lwp->must_set_ptrace_flags = 0; | |
1022 | } | |
1023 | } | |
1024 | ||
7ae1a6a6 | 1025 | int |
fd000fb3 | 1026 | linux_process_target::attach_lwp (ptid_t ptid) |
da6d8c04 | 1027 | { |
54a0b537 | 1028 | struct lwp_info *new_lwp; |
e38504b3 | 1029 | int lwpid = ptid.lwp (); |
611cb4a5 | 1030 | |
b8e1b30e | 1031 | if (ptrace (PTRACE_ATTACH, lwpid, (PTRACE_TYPE_ARG3) 0, (PTRACE_TYPE_ARG4) 0) |
56f7af9c | 1032 | != 0) |
7ae1a6a6 | 1033 | return errno; |
24a09b5f | 1034 | |
b3312d80 | 1035 | new_lwp = add_lwp (ptid); |
0d62e5e8 | 1036 | |
a6dbe5df PA |
1037 | /* We need to wait for SIGSTOP before being able to make the next |
1038 | ptrace call on this LWP. */ | |
1039 | new_lwp->must_set_ptrace_flags = 1; | |
1040 | ||
644cebc9 | 1041 | if (linux_proc_pid_is_stopped (lwpid)) |
c14d7ab2 PA |
1042 | { |
1043 | if (debug_threads) | |
87ce2a04 | 1044 | debug_printf ("Attached to a stopped process\n"); |
c14d7ab2 PA |
1045 | |
1046 | /* The process is definitely stopped. It is in a job control | |
1047 | stop, unless the kernel predates the TASK_STOPPED / | |
1048 | TASK_TRACED distinction, in which case it might be in a | |
1049 | ptrace stop. Make sure it is in a ptrace stop; from there we | |
1050 | can kill it, signal it, et cetera. | |
1051 | ||
1052 | First make sure there is a pending SIGSTOP. Since we are | |
1053 | already attached, the process can not transition from stopped | |
1054 | to running without a PTRACE_CONT; so we know this signal will | |
1055 | go into the queue. The SIGSTOP generated by PTRACE_ATTACH is | |
1056 | probably already in the queue (unless this kernel is old | |
1057 | enough to use TASK_STOPPED for ptrace stops); but since | |
1058 | SIGSTOP is not an RT signal, it can only be queued once. */ | |
1059 | kill_lwp (lwpid, SIGSTOP); | |
1060 | ||
1061 | /* Finally, resume the stopped process. This will deliver the | |
1062 | SIGSTOP (or a higher priority signal, just like normal | |
1063 | PTRACE_ATTACH), which we'll catch later on. */ | |
b8e1b30e | 1064 | ptrace (PTRACE_CONT, lwpid, (PTRACE_TYPE_ARG3) 0, (PTRACE_TYPE_ARG4) 0); |
c14d7ab2 PA |
1065 | } |
1066 | ||
0d62e5e8 | 1067 | /* The next time we wait for this LWP we'll see a SIGSTOP as PTRACE_ATTACH |
0e21c1ec DE |
1068 | brings it to a halt. |
1069 | ||
1070 | There are several cases to consider here: | |
1071 | ||
1072 | 1) gdbserver has already attached to the process and is being notified | |
1b3f6016 | 1073 | of a new thread that is being created. |
d50171e4 PA |
1074 | In this case we should ignore that SIGSTOP and resume the |
1075 | process. This is handled below by setting stop_expected = 1, | |
8336d594 | 1076 | and the fact that add_thread sets last_resume_kind == |
d50171e4 | 1077 | resume_continue. |
0e21c1ec DE |
1078 | |
1079 | 2) This is the first thread (the process thread), and we're attaching | |
1b3f6016 PA |
1080 | to it via attach_inferior. |
1081 | In this case we want the process thread to stop. | |
d50171e4 PA |
1082 | This is handled by having linux_attach set last_resume_kind == |
1083 | resume_stop after we return. | |
e3deef73 LM |
1084 | |
1085 | If the pid we are attaching to is also the tgid, we attach to and | |
1086 | stop all the existing threads. Otherwise, we attach to pid and | |
1087 | ignore any other threads in the same group as this pid. | |
0e21c1ec DE |
1088 | |
1089 | 3) GDB is connecting to gdbserver and is requesting an enumeration of all | |
1b3f6016 PA |
1090 | existing threads. |
1091 | In this case we want the thread to stop. | |
1092 | FIXME: This case is currently not properly handled. | |
1093 | We should wait for the SIGSTOP but don't. Things work apparently | |
1094 | because enough time passes between when we ptrace (ATTACH) and when | |
1095 | gdb makes the next ptrace call on the thread. | |
0d62e5e8 DJ |
1096 | |
1097 | On the other hand, if we are currently trying to stop all threads, we | |
1098 | should treat the new thread as if we had sent it a SIGSTOP. This works | |
54a0b537 | 1099 | because we are guaranteed that the add_lwp call above added us to the |
0e21c1ec DE |
1100 | end of the list, and so the new thread has not yet reached |
1101 | wait_for_sigstop (but will). */ | |
d50171e4 | 1102 | new_lwp->stop_expected = 1; |
0d62e5e8 | 1103 | |
7ae1a6a6 | 1104 | return 0; |
95954743 PA |
1105 | } |
1106 | ||
8784d563 PA |
1107 | /* Callback for linux_proc_attach_tgid_threads. Attach to PTID if not |
1108 | already attached. Returns true if a new LWP is found, false | |
1109 | otherwise. */ | |
1110 | ||
1111 | static int | |
1112 | attach_proc_task_lwp_callback (ptid_t ptid) | |
1113 | { | |
1114 | /* Is this a new thread? */ | |
1115 | if (find_thread_ptid (ptid) == NULL) | |
1116 | { | |
e38504b3 | 1117 | int lwpid = ptid.lwp (); |
8784d563 PA |
1118 | int err; |
1119 | ||
1120 | if (debug_threads) | |
1121 | debug_printf ("Found new lwp %d\n", lwpid); | |
1122 | ||
fd000fb3 | 1123 | err = the_linux_target->attach_lwp (ptid); |
8784d563 PA |
1124 | |
1125 | /* Be quiet if we simply raced with the thread exiting. EPERM | |
1126 | is returned if the thread's task still exists, and is marked | |
1127 | as exited or zombie, as well as other conditions, so in that | |
1128 | case, confirm the status in /proc/PID/status. */ | |
1129 | if (err == ESRCH | |
1130 | || (err == EPERM && linux_proc_pid_is_gone (lwpid))) | |
1131 | { | |
1132 | if (debug_threads) | |
1133 | { | |
1134 | debug_printf ("Cannot attach to lwp %d: " | |
1135 | "thread is gone (%d: %s)\n", | |
6d91ce9a | 1136 | lwpid, err, safe_strerror (err)); |
8784d563 PA |
1137 | } |
1138 | } | |
1139 | else if (err != 0) | |
1140 | { | |
4d9b86e1 | 1141 | std::string reason |
50fa3001 | 1142 | = linux_ptrace_attach_fail_reason_string (ptid, err); |
4d9b86e1 SM |
1143 | |
1144 | warning (_("Cannot attach to lwp %d: %s"), lwpid, reason.c_str ()); | |
8784d563 PA |
1145 | } |
1146 | ||
1147 | return 1; | |
1148 | } | |
1149 | return 0; | |
1150 | } | |
1151 | ||
500c1d85 PA |
1152 | static void async_file_mark (void); |
1153 | ||
e3deef73 LM |
1154 | /* Attach to PID. If PID is the tgid, attach to it and all |
1155 | of its threads. */ | |
1156 | ||
ef03dad8 TBA |
1157 | int |
1158 | linux_process_target::attach (unsigned long pid) | |
0d62e5e8 | 1159 | { |
500c1d85 PA |
1160 | struct process_info *proc; |
1161 | struct thread_info *initial_thread; | |
fd79271b | 1162 | ptid_t ptid = ptid_t (pid, pid, 0); |
7ae1a6a6 PA |
1163 | int err; |
1164 | ||
fd000fb3 | 1165 | proc = add_linux_process (pid, 1); |
df0da8a2 | 1166 | |
e3deef73 LM |
1167 | /* Attach to PID. We will check for other threads |
1168 | soon. */ | |
fd000fb3 | 1169 | err = attach_lwp (ptid); |
7ae1a6a6 | 1170 | if (err != 0) |
4d9b86e1 | 1171 | { |
df0da8a2 | 1172 | remove_process (proc); |
4d9b86e1 | 1173 | |
50fa3001 SDJ |
1174 | std::string reason = linux_ptrace_attach_fail_reason_string (ptid, err); |
1175 | error ("Cannot attach to process %ld: %s", pid, reason.c_str ()); | |
4d9b86e1 | 1176 | } |
7ae1a6a6 | 1177 | |
500c1d85 PA |
1178 | /* Don't ignore the initial SIGSTOP if we just attached to this |
1179 | process. It will be collected by wait shortly. */ | |
fd79271b | 1180 | initial_thread = find_thread_ptid (ptid_t (pid, pid, 0)); |
500c1d85 | 1181 | initial_thread->last_resume_kind = resume_stop; |
0d62e5e8 | 1182 | |
8784d563 PA |
1183 | /* We must attach to every LWP. If /proc is mounted, use that to |
1184 | find them now. On the one hand, the inferior may be using raw | |
1185 | clone instead of using pthreads. On the other hand, even if it | |
1186 | is using pthreads, GDB may not be connected yet (thread_db needs | |
1187 | to do symbol lookups, through qSymbol). Also, thread_db walks | |
1188 | structures in the inferior's address space to find the list of | |
1189 | threads/LWPs, and those structures may well be corrupted. Note | |
1190 | that once thread_db is loaded, we'll still use it to list threads | |
1191 | and associate pthread info with each LWP. */ | |
1192 | linux_proc_attach_tgid_threads (pid, attach_proc_task_lwp_callback); | |
500c1d85 PA |
1193 | |
1194 | /* GDB will shortly read the xml target description for this | |
1195 | process, to figure out the process' architecture. But the target | |
1196 | description is only filled in when the first process/thread in | |
1197 | the thread group reports its initial PTRACE_ATTACH SIGSTOP. Do | |
1198 | that now, otherwise, if GDB is fast enough, it could read the | |
1199 | target description _before_ that initial stop. */ | |
1200 | if (non_stop) | |
1201 | { | |
1202 | struct lwp_info *lwp; | |
1203 | int wstat, lwpid; | |
f2907e49 | 1204 | ptid_t pid_ptid = ptid_t (pid); |
500c1d85 | 1205 | |
d16f3f6c | 1206 | lwpid = wait_for_event_filtered (pid_ptid, pid_ptid, &wstat, __WALL); |
500c1d85 PA |
1207 | gdb_assert (lwpid > 0); |
1208 | ||
f2907e49 | 1209 | lwp = find_lwp_pid (ptid_t (lwpid)); |
500c1d85 PA |
1210 | |
1211 | if (!WIFSTOPPED (wstat) || WSTOPSIG (wstat) != SIGSTOP) | |
1212 | { | |
1213 | lwp->status_pending_p = 1; | |
1214 | lwp->status_pending = wstat; | |
1215 | } | |
1216 | ||
1217 | initial_thread->last_resume_kind = resume_continue; | |
1218 | ||
1219 | async_file_mark (); | |
1220 | ||
1221 | gdb_assert (proc->tdesc != NULL); | |
1222 | } | |
1223 | ||
95954743 PA |
1224 | return 0; |
1225 | } | |
1226 | ||
95954743 | 1227 | static int |
e4eb0dec | 1228 | last_thread_of_process_p (int pid) |
95954743 | 1229 | { |
e4eb0dec | 1230 | bool seen_one = false; |
95954743 | 1231 | |
da4ae14a | 1232 | thread_info *thread = find_thread (pid, [&] (thread_info *thr_arg) |
95954743 | 1233 | { |
e4eb0dec SM |
1234 | if (!seen_one) |
1235 | { | |
1236 | /* This is the first thread of this process we see. */ | |
1237 | seen_one = true; | |
1238 | return false; | |
1239 | } | |
1240 | else | |
1241 | { | |
1242 | /* This is the second thread of this process we see. */ | |
1243 | return true; | |
1244 | } | |
1245 | }); | |
da6d8c04 | 1246 | |
e4eb0dec | 1247 | return thread == NULL; |
95954743 PA |
1248 | } |
1249 | ||
da84f473 PA |
1250 | /* Kill LWP. */ |
1251 | ||
1252 | static void | |
1253 | linux_kill_one_lwp (struct lwp_info *lwp) | |
1254 | { | |
d86d4aaf DE |
1255 | struct thread_info *thr = get_lwp_thread (lwp); |
1256 | int pid = lwpid_of (thr); | |
da84f473 PA |
1257 | |
1258 | /* PTRACE_KILL is unreliable. After stepping into a signal handler, | |
1259 | there is no signal context, and ptrace(PTRACE_KILL) (or | |
1260 | ptrace(PTRACE_CONT, SIGKILL), pretty much the same) acts like | |
1261 | ptrace(CONT, pid, 0,0) and just resumes the tracee. A better | |
1262 | alternative is to kill with SIGKILL. We only need one SIGKILL | |
1263 | per process, not one for each thread. But since we still support | |
4a6ed09b PA |
1264 | support debugging programs using raw clone without CLONE_THREAD, |
1265 | we send one for each thread. For years, we used PTRACE_KILL | |
1266 | only, so we're being a bit paranoid about some old kernels where | |
1267 | PTRACE_KILL might work better (dubious if there are any such, but | |
1268 | that's why it's paranoia), so we try SIGKILL first, PTRACE_KILL | |
1269 | second, and so we're fine everywhere. */ | |
da84f473 PA |
1270 | |
1271 | errno = 0; | |
69ff6be5 | 1272 | kill_lwp (pid, SIGKILL); |
da84f473 | 1273 | if (debug_threads) |
ce9e3fe7 PA |
1274 | { |
1275 | int save_errno = errno; | |
1276 | ||
1277 | debug_printf ("LKL: kill_lwp (SIGKILL) %s, 0, 0 (%s)\n", | |
1278 | target_pid_to_str (ptid_of (thr)), | |
6d91ce9a | 1279 | save_errno ? safe_strerror (save_errno) : "OK"); |
ce9e3fe7 | 1280 | } |
da84f473 PA |
1281 | |
1282 | errno = 0; | |
b8e1b30e | 1283 | ptrace (PTRACE_KILL, pid, (PTRACE_TYPE_ARG3) 0, (PTRACE_TYPE_ARG4) 0); |
da84f473 | 1284 | if (debug_threads) |
ce9e3fe7 PA |
1285 | { |
1286 | int save_errno = errno; | |
1287 | ||
1288 | debug_printf ("LKL: PTRACE_KILL %s, 0, 0 (%s)\n", | |
1289 | target_pid_to_str (ptid_of (thr)), | |
6d91ce9a | 1290 | save_errno ? safe_strerror (save_errno) : "OK"); |
ce9e3fe7 | 1291 | } |
da84f473 PA |
1292 | } |
1293 | ||
e76126e8 PA |
1294 | /* Kill LWP and wait for it to die. */ |
1295 | ||
1296 | static void | |
1297 | kill_wait_lwp (struct lwp_info *lwp) | |
1298 | { | |
1299 | struct thread_info *thr = get_lwp_thread (lwp); | |
e99b03dc | 1300 | int pid = ptid_of (thr).pid (); |
e38504b3 | 1301 | int lwpid = ptid_of (thr).lwp (); |
e76126e8 PA |
1302 | int wstat; |
1303 | int res; | |
1304 | ||
1305 | if (debug_threads) | |
1306 | debug_printf ("kwl: killing lwp %d, for pid: %d\n", lwpid, pid); | |
1307 | ||
1308 | do | |
1309 | { | |
1310 | linux_kill_one_lwp (lwp); | |
1311 | ||
1312 | /* Make sure it died. Notes: | |
1313 | ||
1314 | - The loop is most likely unnecessary. | |
1315 | ||
d16f3f6c | 1316 | - We don't use wait_for_event as that could delete lwps |
e76126e8 PA |
1317 | while we're iterating over them. We're not interested in |
1318 | any pending status at this point, only in making sure all | |
1319 | wait status on the kernel side are collected until the | |
1320 | process is reaped. | |
1321 | ||
1322 | - We don't use __WALL here as the __WALL emulation relies on | |
1323 | SIGCHLD, and killing a stopped process doesn't generate | |
1324 | one, nor an exit status. | |
1325 | */ | |
1326 | res = my_waitpid (lwpid, &wstat, 0); | |
1327 | if (res == -1 && errno == ECHILD) | |
1328 | res = my_waitpid (lwpid, &wstat, __WCLONE); | |
1329 | } while (res > 0 && WIFSTOPPED (wstat)); | |
1330 | ||
586b02a9 PA |
1331 | /* Even if it was stopped, the child may have already disappeared. |
1332 | E.g., if it was killed by SIGKILL. */ | |
1333 | if (res < 0 && errno != ECHILD) | |
1334 | perror_with_name ("kill_wait_lwp"); | |
e76126e8 PA |
1335 | } |
1336 | ||
578290ec | 1337 | /* Callback for `for_each_thread'. Kills an lwp of a given process, |
da84f473 | 1338 | except the leader. */ |
95954743 | 1339 | |
578290ec SM |
1340 | static void |
1341 | kill_one_lwp_callback (thread_info *thread, int pid) | |
da6d8c04 | 1342 | { |
54a0b537 | 1343 | struct lwp_info *lwp = get_thread_lwp (thread); |
0d62e5e8 | 1344 | |
fd500816 DJ |
1345 | /* We avoid killing the first thread here, because of a Linux kernel (at |
1346 | least 2.6.0-test7 through 2.6.8-rc4) bug; if we kill the parent before | |
1347 | the children get a chance to be reaped, it will remain a zombie | |
1348 | forever. */ | |
95954743 | 1349 | |
d86d4aaf | 1350 | if (lwpid_of (thread) == pid) |
95954743 PA |
1351 | { |
1352 | if (debug_threads) | |
87ce2a04 | 1353 | debug_printf ("lkop: is last of process %s\n", |
9c80ecd6 | 1354 | target_pid_to_str (thread->id)); |
578290ec | 1355 | return; |
95954743 | 1356 | } |
fd500816 | 1357 | |
e76126e8 | 1358 | kill_wait_lwp (lwp); |
da6d8c04 DJ |
1359 | } |
1360 | ||
c6885a57 TBA |
1361 | int |
1362 | linux_process_target::kill (process_info *process) | |
0d62e5e8 | 1363 | { |
a780ef4f | 1364 | int pid = process->pid; |
9d606399 | 1365 | |
f9e39928 PA |
1366 | /* If we're killing a running inferior, make sure it is stopped |
1367 | first, as PTRACE_KILL will not work otherwise. */ | |
7984d532 | 1368 | stop_all_lwps (0, NULL); |
f9e39928 | 1369 | |
578290ec SM |
1370 | for_each_thread (pid, [&] (thread_info *thread) |
1371 | { | |
1372 | kill_one_lwp_callback (thread, pid); | |
1373 | }); | |
fd500816 | 1374 | |
54a0b537 | 1375 | /* See the comment in linux_kill_one_lwp. We did not kill the first |
fd500816 | 1376 | thread in the list, so do so now. */ |
a780ef4f | 1377 | lwp_info *lwp = find_lwp_pid (ptid_t (pid)); |
bd99dc85 | 1378 | |
784867a5 | 1379 | if (lwp == NULL) |
fd500816 | 1380 | { |
784867a5 | 1381 | if (debug_threads) |
d86d4aaf DE |
1382 | debug_printf ("lk_1: cannot find lwp for pid: %d\n", |
1383 | pid); | |
784867a5 JK |
1384 | } |
1385 | else | |
e76126e8 | 1386 | kill_wait_lwp (lwp); |
2d717e4f | 1387 | |
8adb37b9 | 1388 | mourn (process); |
f9e39928 PA |
1389 | |
1390 | /* Since we presently can only stop all lwps of all processes, we | |
1391 | need to unstop lwps of other processes. */ | |
7984d532 | 1392 | unstop_all_lwps (0, NULL); |
95954743 | 1393 | return 0; |
0d62e5e8 DJ |
1394 | } |
1395 | ||
9b224c5e PA |
1396 | /* Get pending signal of THREAD, for detaching purposes. This is the |
1397 | signal the thread last stopped for, which we need to deliver to the | |
1398 | thread when detaching, otherwise, it'd be suppressed/lost. */ | |
1399 | ||
1400 | static int | |
1401 | get_detach_signal (struct thread_info *thread) | |
1402 | { | |
c12a5089 | 1403 | client_state &cs = get_client_state (); |
a493e3e2 | 1404 | enum gdb_signal signo = GDB_SIGNAL_0; |
9b224c5e PA |
1405 | int status; |
1406 | struct lwp_info *lp = get_thread_lwp (thread); | |
1407 | ||
1408 | if (lp->status_pending_p) | |
1409 | status = lp->status_pending; | |
1410 | else | |
1411 | { | |
1412 | /* If the thread had been suspended by gdbserver, and it stopped | |
1413 | cleanly, then it'll have stopped with SIGSTOP. But we don't | |
1414 | want to deliver that SIGSTOP. */ | |
1415 | if (thread->last_status.kind != TARGET_WAITKIND_STOPPED | |
a493e3e2 | 1416 | || thread->last_status.value.sig == GDB_SIGNAL_0) |
9b224c5e PA |
1417 | return 0; |
1418 | ||
1419 | /* Otherwise, we may need to deliver the signal we | |
1420 | intercepted. */ | |
1421 | status = lp->last_status; | |
1422 | } | |
1423 | ||
1424 | if (!WIFSTOPPED (status)) | |
1425 | { | |
1426 | if (debug_threads) | |
87ce2a04 | 1427 | debug_printf ("GPS: lwp %s hasn't stopped: no pending signal\n", |
d86d4aaf | 1428 | target_pid_to_str (ptid_of (thread))); |
9b224c5e PA |
1429 | return 0; |
1430 | } | |
1431 | ||
1432 | /* Extended wait statuses aren't real SIGTRAPs. */ | |
89a5711c | 1433 | if (WSTOPSIG (status) == SIGTRAP && linux_is_extended_waitstatus (status)) |
9b224c5e PA |
1434 | { |
1435 | if (debug_threads) | |
87ce2a04 DE |
1436 | debug_printf ("GPS: lwp %s had stopped with extended " |
1437 | "status: no pending signal\n", | |
d86d4aaf | 1438 | target_pid_to_str (ptid_of (thread))); |
9b224c5e PA |
1439 | return 0; |
1440 | } | |
1441 | ||
2ea28649 | 1442 | signo = gdb_signal_from_host (WSTOPSIG (status)); |
9b224c5e | 1443 | |
c12a5089 | 1444 | if (cs.program_signals_p && !cs.program_signals[signo]) |
9b224c5e PA |
1445 | { |
1446 | if (debug_threads) | |
87ce2a04 | 1447 | debug_printf ("GPS: lwp %s had signal %s, but it is in nopass state\n", |
d86d4aaf | 1448 | target_pid_to_str (ptid_of (thread)), |
87ce2a04 | 1449 | gdb_signal_to_string (signo)); |
9b224c5e PA |
1450 | return 0; |
1451 | } | |
c12a5089 | 1452 | else if (!cs.program_signals_p |
9b224c5e PA |
1453 | /* If we have no way to know which signals GDB does not |
1454 | want to have passed to the program, assume | |
1455 | SIGTRAP/SIGINT, which is GDB's default. */ | |
a493e3e2 | 1456 | && (signo == GDB_SIGNAL_TRAP || signo == GDB_SIGNAL_INT)) |
9b224c5e PA |
1457 | { |
1458 | if (debug_threads) | |
87ce2a04 DE |
1459 | debug_printf ("GPS: lwp %s had signal %s, " |
1460 | "but we don't know if we should pass it. " | |
1461 | "Default to not.\n", | |
d86d4aaf | 1462 | target_pid_to_str (ptid_of (thread)), |
87ce2a04 | 1463 | gdb_signal_to_string (signo)); |
9b224c5e PA |
1464 | return 0; |
1465 | } | |
1466 | else | |
1467 | { | |
1468 | if (debug_threads) | |
87ce2a04 | 1469 | debug_printf ("GPS: lwp %s has pending signal %s: delivering it.\n", |
d86d4aaf | 1470 | target_pid_to_str (ptid_of (thread)), |
87ce2a04 | 1471 | gdb_signal_to_string (signo)); |
9b224c5e PA |
1472 | |
1473 | return WSTOPSIG (status); | |
1474 | } | |
1475 | } | |
1476 | ||
fd000fb3 TBA |
1477 | void |
1478 | linux_process_target::detach_one_lwp (lwp_info *lwp) | |
6ad8ae5c | 1479 | { |
ced2dffb | 1480 | struct thread_info *thread = get_lwp_thread (lwp); |
9b224c5e | 1481 | int sig; |
ced2dffb | 1482 | int lwpid; |
6ad8ae5c | 1483 | |
9b224c5e | 1484 | /* If there is a pending SIGSTOP, get rid of it. */ |
54a0b537 | 1485 | if (lwp->stop_expected) |
ae13219e | 1486 | { |
9b224c5e | 1487 | if (debug_threads) |
87ce2a04 | 1488 | debug_printf ("Sending SIGCONT to %s\n", |
d86d4aaf | 1489 | target_pid_to_str (ptid_of (thread))); |
9b224c5e | 1490 | |
d86d4aaf | 1491 | kill_lwp (lwpid_of (thread), SIGCONT); |
54a0b537 | 1492 | lwp->stop_expected = 0; |
ae13219e DJ |
1493 | } |
1494 | ||
9b224c5e PA |
1495 | /* Pass on any pending signal for this thread. */ |
1496 | sig = get_detach_signal (thread); | |
1497 | ||
ced2dffb PA |
1498 | /* Preparing to resume may try to write registers, and fail if the |
1499 | lwp is zombie. If that happens, ignore the error. We'll handle | |
1500 | it below, when detach fails with ESRCH. */ | |
a70b8144 | 1501 | try |
ced2dffb PA |
1502 | { |
1503 | /* Flush any pending changes to the process's registers. */ | |
1504 | regcache_invalidate_thread (thread); | |
1505 | ||
1506 | /* Finally, let it resume. */ | |
d7599cc0 | 1507 | low_prepare_to_resume (lwp); |
ced2dffb | 1508 | } |
230d2906 | 1509 | catch (const gdb_exception_error &ex) |
ced2dffb PA |
1510 | { |
1511 | if (!check_ptrace_stopped_lwp_gone (lwp)) | |
eedc3f4f | 1512 | throw; |
ced2dffb | 1513 | } |
ced2dffb PA |
1514 | |
1515 | lwpid = lwpid_of (thread); | |
1516 | if (ptrace (PTRACE_DETACH, lwpid, (PTRACE_TYPE_ARG3) 0, | |
b8e1b30e | 1517 | (PTRACE_TYPE_ARG4) (long) sig) < 0) |
ced2dffb PA |
1518 | { |
1519 | int save_errno = errno; | |
1520 | ||
1521 | /* We know the thread exists, so ESRCH must mean the lwp is | |
1522 | zombie. This can happen if one of the already-detached | |
1523 | threads exits the whole thread group. In that case we're | |
1524 | still attached, and must reap the lwp. */ | |
1525 | if (save_errno == ESRCH) | |
1526 | { | |
1527 | int ret, status; | |
1528 | ||
1529 | ret = my_waitpid (lwpid, &status, __WALL); | |
1530 | if (ret == -1) | |
1531 | { | |
1532 | warning (_("Couldn't reap LWP %d while detaching: %s"), | |
6d91ce9a | 1533 | lwpid, safe_strerror (errno)); |
ced2dffb PA |
1534 | } |
1535 | else if (!WIFEXITED (status) && !WIFSIGNALED (status)) | |
1536 | { | |
1537 | warning (_("Reaping LWP %d while detaching " | |
1538 | "returned unexpected status 0x%x"), | |
1539 | lwpid, status); | |
1540 | } | |
1541 | } | |
1542 | else | |
1543 | { | |
1544 | error (_("Can't detach %s: %s"), | |
1545 | target_pid_to_str (ptid_of (thread)), | |
6d91ce9a | 1546 | safe_strerror (save_errno)); |
ced2dffb PA |
1547 | } |
1548 | } | |
1549 | else if (debug_threads) | |
1550 | { | |
1551 | debug_printf ("PTRACE_DETACH (%s, %s, 0) (OK)\n", | |
1552 | target_pid_to_str (ptid_of (thread)), | |
1553 | strsignal (sig)); | |
1554 | } | |
bd99dc85 PA |
1555 | |
1556 | delete_lwp (lwp); | |
ced2dffb PA |
1557 | } |
1558 | ||
9061c9cf TBA |
1559 | int |
1560 | linux_process_target::detach (process_info *process) | |
95954743 | 1561 | { |
ced2dffb | 1562 | struct lwp_info *main_lwp; |
95954743 | 1563 | |
863d01bd PA |
1564 | /* As there's a step over already in progress, let it finish first, |
1565 | otherwise nesting a stabilize_threads operation on top gets real | |
1566 | messy. */ | |
1567 | complete_ongoing_step_over (); | |
1568 | ||
f9e39928 | 1569 | /* Stop all threads before detaching. First, ptrace requires that |
30baf67b | 1570 | the thread is stopped to successfully detach. Second, thread_db |
f9e39928 PA |
1571 | may need to uninstall thread event breakpoints from memory, which |
1572 | only works with a stopped process anyway. */ | |
7984d532 | 1573 | stop_all_lwps (0, NULL); |
f9e39928 | 1574 | |
ca5c370d | 1575 | #ifdef USE_THREAD_DB |
8336d594 | 1576 | thread_db_detach (process); |
ca5c370d PA |
1577 | #endif |
1578 | ||
fa593d66 | 1579 | /* Stabilize threads (move out of jump pads). */ |
5c9eb2f2 | 1580 | target_stabilize_threads (); |
fa593d66 | 1581 | |
ced2dffb PA |
1582 | /* Detach from the clone lwps first. If the thread group exits just |
1583 | while we're detaching, we must reap the clone lwps before we're | |
1584 | able to reap the leader. */ | |
fd000fb3 TBA |
1585 | for_each_thread (process->pid, [this] (thread_info *thread) |
1586 | { | |
1587 | /* We don't actually detach from the thread group leader just yet. | |
1588 | If the thread group exits, we must reap the zombie clone lwps | |
1589 | before we're able to reap the leader. */ | |
1590 | if (thread->id.pid () == thread->id.lwp ()) | |
1591 | return; | |
1592 | ||
1593 | lwp_info *lwp = get_thread_lwp (thread); | |
1594 | detach_one_lwp (lwp); | |
1595 | }); | |
ced2dffb | 1596 | |
ef2ddb33 | 1597 | main_lwp = find_lwp_pid (ptid_t (process->pid)); |
fd000fb3 | 1598 | detach_one_lwp (main_lwp); |
8336d594 | 1599 | |
8adb37b9 | 1600 | mourn (process); |
f9e39928 PA |
1601 | |
1602 | /* Since we presently can only stop all lwps of all processes, we | |
1603 | need to unstop lwps of other processes. */ | |
7984d532 | 1604 | unstop_all_lwps (0, NULL); |
f9e39928 PA |
1605 | return 0; |
1606 | } | |
1607 | ||
1608 | /* Remove all LWPs that belong to process PROC from the lwp list. */ | |
1609 | ||
8adb37b9 TBA |
1610 | void |
1611 | linux_process_target::mourn (process_info *process) | |
8336d594 PA |
1612 | { |
1613 | struct process_info_private *priv; | |
1614 | ||
1615 | #ifdef USE_THREAD_DB | |
1616 | thread_db_mourn (process); | |
1617 | #endif | |
1618 | ||
fd000fb3 | 1619 | for_each_thread (process->pid, [this] (thread_info *thread) |
6b2a85da SM |
1620 | { |
1621 | delete_lwp (get_thread_lwp (thread)); | |
1622 | }); | |
f9e39928 | 1623 | |
8336d594 | 1624 | /* Freeing all private data. */ |
fe978cb0 | 1625 | priv = process->priv; |
fd000fb3 | 1626 | low_delete_process (priv->arch_private); |
8336d594 | 1627 | free (priv); |
fe978cb0 | 1628 | process->priv = NULL; |
505106cd PA |
1629 | |
1630 | remove_process (process); | |
8336d594 PA |
1631 | } |
1632 | ||
95a49a39 TBA |
1633 | void |
1634 | linux_process_target::join (int pid) | |
444d6139 | 1635 | { |
444d6139 PA |
1636 | int status, ret; |
1637 | ||
1638 | do { | |
d105de22 | 1639 | ret = my_waitpid (pid, &status, 0); |
444d6139 PA |
1640 | if (WIFEXITED (status) || WIFSIGNALED (status)) |
1641 | break; | |
1642 | } while (ret != -1 || errno != ECHILD); | |
1643 | } | |
1644 | ||
13d3d99b TBA |
1645 | /* Return true if the given thread is still alive. */ |
1646 | ||
1647 | bool | |
1648 | linux_process_target::thread_alive (ptid_t ptid) | |
0d62e5e8 | 1649 | { |
95954743 PA |
1650 | struct lwp_info *lwp = find_lwp_pid (ptid); |
1651 | ||
1652 | /* We assume we always know if a thread exits. If a whole process | |
1653 | exited but we still haven't been able to report it to GDB, we'll | |
1654 | hold on to the last lwp of the dead process. */ | |
1655 | if (lwp != NULL) | |
00db26fa | 1656 | return !lwp_is_marked_dead (lwp); |
0d62e5e8 DJ |
1657 | else |
1658 | return 0; | |
1659 | } | |
1660 | ||
df95181f TBA |
1661 | bool |
1662 | linux_process_target::thread_still_has_status_pending (thread_info *thread) | |
582511be PA |
1663 | { |
1664 | struct lwp_info *lp = get_thread_lwp (thread); | |
1665 | ||
1666 | if (!lp->status_pending_p) | |
1667 | return 0; | |
1668 | ||
582511be | 1669 | if (thread->last_resume_kind != resume_stop |
15c66dd6 PA |
1670 | && (lp->stop_reason == TARGET_STOPPED_BY_SW_BREAKPOINT |
1671 | || lp->stop_reason == TARGET_STOPPED_BY_HW_BREAKPOINT)) | |
582511be PA |
1672 | { |
1673 | struct thread_info *saved_thread; | |
1674 | CORE_ADDR pc; | |
1675 | int discard = 0; | |
1676 | ||
1677 | gdb_assert (lp->last_status != 0); | |
1678 | ||
1679 | pc = get_pc (lp); | |
1680 | ||
1681 | saved_thread = current_thread; | |
1682 | current_thread = thread; | |
1683 | ||
1684 | if (pc != lp->stop_pc) | |
1685 | { | |
1686 | if (debug_threads) | |
1687 | debug_printf ("PC of %ld changed\n", | |
1688 | lwpid_of (thread)); | |
1689 | discard = 1; | |
1690 | } | |
3e572f71 PA |
1691 | |
1692 | #if !USE_SIGTRAP_SIGINFO | |
15c66dd6 | 1693 | else if (lp->stop_reason == TARGET_STOPPED_BY_SW_BREAKPOINT |
d7146cda | 1694 | && !low_breakpoint_at (pc)) |
582511be PA |
1695 | { |
1696 | if (debug_threads) | |
1697 | debug_printf ("previous SW breakpoint of %ld gone\n", | |
1698 | lwpid_of (thread)); | |
1699 | discard = 1; | |
1700 | } | |
15c66dd6 | 1701 | else if (lp->stop_reason == TARGET_STOPPED_BY_HW_BREAKPOINT |
582511be PA |
1702 | && !hardware_breakpoint_inserted_here (pc)) |
1703 | { | |
1704 | if (debug_threads) | |
1705 | debug_printf ("previous HW breakpoint of %ld gone\n", | |
1706 | lwpid_of (thread)); | |
1707 | discard = 1; | |
1708 | } | |
3e572f71 | 1709 | #endif |
582511be PA |
1710 | |
1711 | current_thread = saved_thread; | |
1712 | ||
1713 | if (discard) | |
1714 | { | |
1715 | if (debug_threads) | |
1716 | debug_printf ("discarding pending breakpoint status\n"); | |
1717 | lp->status_pending_p = 0; | |
1718 | return 0; | |
1719 | } | |
1720 | } | |
1721 | ||
1722 | return 1; | |
1723 | } | |
1724 | ||
a681f9c9 PA |
1725 | /* Returns true if LWP is resumed from the client's perspective. */ |
1726 | ||
1727 | static int | |
1728 | lwp_resumed (struct lwp_info *lwp) | |
1729 | { | |
1730 | struct thread_info *thread = get_lwp_thread (lwp); | |
1731 | ||
1732 | if (thread->last_resume_kind != resume_stop) | |
1733 | return 1; | |
1734 | ||
1735 | /* Did gdb send us a `vCont;t', but we haven't reported the | |
1736 | corresponding stop to gdb yet? If so, the thread is still | |
1737 | resumed/running from gdb's perspective. */ | |
1738 | if (thread->last_resume_kind == resume_stop | |
1739 | && thread->last_status.kind == TARGET_WAITKIND_IGNORE) | |
1740 | return 1; | |
1741 | ||
1742 | return 0; | |
1743 | } | |
1744 | ||
df95181f TBA |
1745 | bool |
1746 | linux_process_target::status_pending_p_callback (thread_info *thread, | |
1747 | ptid_t ptid) | |
0d62e5e8 | 1748 | { |
582511be | 1749 | struct lwp_info *lp = get_thread_lwp (thread); |
95954743 PA |
1750 | |
1751 | /* Check if we're only interested in events from a specific process | |
afa8d396 | 1752 | or a specific LWP. */ |
83e1b6c1 | 1753 | if (!thread->id.matches (ptid)) |
95954743 | 1754 | return 0; |
0d62e5e8 | 1755 | |
a681f9c9 PA |
1756 | if (!lwp_resumed (lp)) |
1757 | return 0; | |
1758 | ||
582511be | 1759 | if (lp->status_pending_p |
df95181f | 1760 | && !thread_still_has_status_pending (thread)) |
582511be | 1761 | { |
df95181f | 1762 | resume_one_lwp (lp, lp->stepping, GDB_SIGNAL_0, NULL); |
582511be PA |
1763 | return 0; |
1764 | } | |
0d62e5e8 | 1765 | |
582511be | 1766 | return lp->status_pending_p; |
0d62e5e8 DJ |
1767 | } |
1768 | ||
95954743 PA |
1769 | struct lwp_info * |
1770 | find_lwp_pid (ptid_t ptid) | |
1771 | { | |
da4ae14a | 1772 | thread_info *thread = find_thread ([&] (thread_info *thr_arg) |
454296a2 SM |
1773 | { |
1774 | int lwp = ptid.lwp () != 0 ? ptid.lwp () : ptid.pid (); | |
da4ae14a | 1775 | return thr_arg->id.lwp () == lwp; |
454296a2 | 1776 | }); |
d86d4aaf DE |
1777 | |
1778 | if (thread == NULL) | |
1779 | return NULL; | |
1780 | ||
9c80ecd6 | 1781 | return get_thread_lwp (thread); |
95954743 PA |
1782 | } |
1783 | ||
fa96cb38 | 1784 | /* Return the number of known LWPs in the tgid given by PID. */ |
0d62e5e8 | 1785 | |
fa96cb38 PA |
1786 | static int |
1787 | num_lwps (int pid) | |
1788 | { | |
fa96cb38 | 1789 | int count = 0; |
0d62e5e8 | 1790 | |
4d3bb80e SM |
1791 | for_each_thread (pid, [&] (thread_info *thread) |
1792 | { | |
9c80ecd6 | 1793 | count++; |
4d3bb80e | 1794 | }); |
3aee8918 | 1795 | |
fa96cb38 PA |
1796 | return count; |
1797 | } | |
d61ddec4 | 1798 | |
6d4ee8c6 GB |
1799 | /* See nat/linux-nat.h. */ |
1800 | ||
1801 | struct lwp_info * | |
1802 | iterate_over_lwps (ptid_t filter, | |
d3a70e03 | 1803 | gdb::function_view<iterate_over_lwps_ftype> callback) |
6d4ee8c6 | 1804 | { |
da4ae14a | 1805 | thread_info *thread = find_thread (filter, [&] (thread_info *thr_arg) |
6d1e5673 | 1806 | { |
da4ae14a | 1807 | lwp_info *lwp = get_thread_lwp (thr_arg); |
6d1e5673 | 1808 | |
d3a70e03 | 1809 | return callback (lwp); |
6d1e5673 | 1810 | }); |
6d4ee8c6 | 1811 | |
9c80ecd6 | 1812 | if (thread == NULL) |
6d4ee8c6 GB |
1813 | return NULL; |
1814 | ||
9c80ecd6 | 1815 | return get_thread_lwp (thread); |
6d4ee8c6 GB |
1816 | } |
1817 | ||
fd000fb3 TBA |
1818 | void |
1819 | linux_process_target::check_zombie_leaders () | |
fa96cb38 | 1820 | { |
fd000fb3 | 1821 | for_each_process ([this] (process_info *proc) { |
9179355e SM |
1822 | pid_t leader_pid = pid_of (proc); |
1823 | struct lwp_info *leader_lp; | |
1824 | ||
f2907e49 | 1825 | leader_lp = find_lwp_pid (ptid_t (leader_pid)); |
9179355e SM |
1826 | |
1827 | if (debug_threads) | |
1828 | debug_printf ("leader_pid=%d, leader_lp!=NULL=%d, " | |
1829 | "num_lwps=%d, zombie=%d\n", | |
1830 | leader_pid, leader_lp!= NULL, num_lwps (leader_pid), | |
1831 | linux_proc_pid_is_zombie (leader_pid)); | |
1832 | ||
1833 | if (leader_lp != NULL && !leader_lp->stopped | |
1834 | /* Check if there are other threads in the group, as we may | |
1835 | have raced with the inferior simply exiting. */ | |
1836 | && !last_thread_of_process_p (leader_pid) | |
1837 | && linux_proc_pid_is_zombie (leader_pid)) | |
1838 | { | |
1839 | /* A leader zombie can mean one of two things: | |
1840 | ||
1841 | - It exited, and there's an exit status pending | |
1842 | available, or only the leader exited (not the whole | |
1843 | program). In the latter case, we can't waitpid the | |
1844 | leader's exit status until all other threads are gone. | |
1845 | ||
1846 | - There are 3 or more threads in the group, and a thread | |
1847 | other than the leader exec'd. On an exec, the Linux | |
1848 | kernel destroys all other threads (except the execing | |
1849 | one) in the thread group, and resets the execing thread's | |
1850 | tid to the tgid. No exit notification is sent for the | |
1851 | execing thread -- from the ptracer's perspective, it | |
1852 | appears as though the execing thread just vanishes. | |
1853 | Until we reap all other threads except the leader and the | |
1854 | execing thread, the leader will be zombie, and the | |
1855 | execing thread will be in `D (disc sleep)'. As soon as | |
1856 | all other threads are reaped, the execing thread changes | |
1857 | it's tid to the tgid, and the previous (zombie) leader | |
1858 | vanishes, giving place to the "new" leader. We could try | |
1859 | distinguishing the exit and exec cases, by waiting once | |
1860 | more, and seeing if something comes out, but it doesn't | |
1861 | sound useful. The previous leader _does_ go away, and | |
1862 | we'll re-add the new one once we see the exec event | |
1863 | (which is just the same as what would happen if the | |
1864 | previous leader did exit voluntarily before some other | |
1865 | thread execs). */ | |
1866 | ||
1867 | if (debug_threads) | |
1868 | debug_printf ("CZL: Thread group leader %d zombie " | |
1869 | "(it exited, or another thread execd).\n", | |
1870 | leader_pid); | |
1871 | ||
1872 | delete_lwp (leader_lp); | |
1873 | } | |
1874 | }); | |
fa96cb38 | 1875 | } |
c3adc08c | 1876 | |
a1385b7b SM |
1877 | /* Callback for `find_thread'. Returns the first LWP that is not |
1878 | stopped. */ | |
d50171e4 | 1879 | |
a1385b7b SM |
1880 | static bool |
1881 | not_stopped_callback (thread_info *thread, ptid_t filter) | |
fa96cb38 | 1882 | { |
a1385b7b SM |
1883 | if (!thread->id.matches (filter)) |
1884 | return false; | |
47c0c975 | 1885 | |
a1385b7b | 1886 | lwp_info *lwp = get_thread_lwp (thread); |
fa96cb38 | 1887 | |
a1385b7b | 1888 | return !lwp->stopped; |
0d62e5e8 | 1889 | } |
611cb4a5 | 1890 | |
863d01bd PA |
1891 | /* Increment LWP's suspend count. */ |
1892 | ||
1893 | static void | |
1894 | lwp_suspended_inc (struct lwp_info *lwp) | |
1895 | { | |
1896 | lwp->suspended++; | |
1897 | ||
1898 | if (debug_threads && lwp->suspended > 4) | |
1899 | { | |
1900 | struct thread_info *thread = get_lwp_thread (lwp); | |
1901 | ||
1902 | debug_printf ("LWP %ld has a suspiciously high suspend count," | |
1903 | " suspended=%d\n", lwpid_of (thread), lwp->suspended); | |
1904 | } | |
1905 | } | |
1906 | ||
1907 | /* Decrement LWP's suspend count. */ | |
1908 | ||
1909 | static void | |
1910 | lwp_suspended_decr (struct lwp_info *lwp) | |
1911 | { | |
1912 | lwp->suspended--; | |
1913 | ||
1914 | if (lwp->suspended < 0) | |
1915 | { | |
1916 | struct thread_info *thread = get_lwp_thread (lwp); | |
1917 | ||
1918 | internal_error (__FILE__, __LINE__, | |
1919 | "unsuspend LWP %ld, suspended=%d\n", lwpid_of (thread), | |
1920 | lwp->suspended); | |
1921 | } | |
1922 | } | |
1923 | ||
219f2f23 PA |
1924 | /* This function should only be called if the LWP got a SIGTRAP. |
1925 | ||
1926 | Handle any tracepoint steps or hits. Return true if a tracepoint | |
1927 | event was handled, 0 otherwise. */ | |
1928 | ||
1929 | static int | |
1930 | handle_tracepoints (struct lwp_info *lwp) | |
1931 | { | |
1932 | struct thread_info *tinfo = get_lwp_thread (lwp); | |
1933 | int tpoint_related_event = 0; | |
1934 | ||
582511be PA |
1935 | gdb_assert (lwp->suspended == 0); |
1936 | ||
7984d532 PA |
1937 | /* If this tracepoint hit causes a tracing stop, we'll immediately |
1938 | uninsert tracepoints. To do this, we temporarily pause all | |
1939 | threads, unpatch away, and then unpause threads. We need to make | |
1940 | sure the unpausing doesn't resume LWP too. */ | |
863d01bd | 1941 | lwp_suspended_inc (lwp); |
7984d532 | 1942 | |
219f2f23 PA |
1943 | /* And we need to be sure that any all-threads-stopping doesn't try |
1944 | to move threads out of the jump pads, as it could deadlock the | |
1945 | inferior (LWP could be in the jump pad, maybe even holding the | |
1946 | lock.) */ | |
1947 | ||
1948 | /* Do any necessary step collect actions. */ | |
1949 | tpoint_related_event |= tracepoint_finished_step (tinfo, lwp->stop_pc); | |
1950 | ||
fa593d66 PA |
1951 | tpoint_related_event |= handle_tracepoint_bkpts (tinfo, lwp->stop_pc); |
1952 | ||
219f2f23 PA |
1953 | /* See if we just hit a tracepoint and do its main collect |
1954 | actions. */ | |
1955 | tpoint_related_event |= tracepoint_was_hit (tinfo, lwp->stop_pc); | |
1956 | ||
863d01bd | 1957 | lwp_suspended_decr (lwp); |
7984d532 PA |
1958 | |
1959 | gdb_assert (lwp->suspended == 0); | |
229d26fc SM |
1960 | gdb_assert (!stabilizing_threads |
1961 | || (lwp->collecting_fast_tracepoint | |
1962 | != fast_tpoint_collect_result::not_collecting)); | |
7984d532 | 1963 | |
219f2f23 PA |
1964 | if (tpoint_related_event) |
1965 | { | |
1966 | if (debug_threads) | |
87ce2a04 | 1967 | debug_printf ("got a tracepoint event\n"); |
219f2f23 PA |
1968 | return 1; |
1969 | } | |
1970 | ||
1971 | return 0; | |
1972 | } | |
1973 | ||
13e567af TBA |
1974 | fast_tpoint_collect_result |
1975 | linux_process_target::linux_fast_tracepoint_collecting | |
1976 | (lwp_info *lwp, fast_tpoint_collect_status *status) | |
fa593d66 PA |
1977 | { |
1978 | CORE_ADDR thread_area; | |
d86d4aaf | 1979 | struct thread_info *thread = get_lwp_thread (lwp); |
fa593d66 | 1980 | |
fa593d66 PA |
1981 | /* Get the thread area address. This is used to recognize which |
1982 | thread is which when tracing with the in-process agent library. | |
1983 | We don't read anything from the address, and treat it as opaque; | |
1984 | it's the address itself that we assume is unique per-thread. */ | |
13e567af | 1985 | if (low_get_thread_area (lwpid_of (thread), &thread_area) == -1) |
229d26fc | 1986 | return fast_tpoint_collect_result::not_collecting; |
fa593d66 PA |
1987 | |
1988 | return fast_tracepoint_collecting (thread_area, lwp->stop_pc, status); | |
1989 | } | |
1990 | ||
13e567af TBA |
1991 | int |
1992 | linux_process_target::low_get_thread_area (int lwpid, CORE_ADDR *addrp) | |
1993 | { | |
1994 | return -1; | |
1995 | } | |
1996 | ||
d16f3f6c TBA |
1997 | bool |
1998 | linux_process_target::maybe_move_out_of_jump_pad (lwp_info *lwp, int *wstat) | |
fa593d66 | 1999 | { |
0bfdf32f | 2000 | struct thread_info *saved_thread; |
fa593d66 | 2001 | |
0bfdf32f GB |
2002 | saved_thread = current_thread; |
2003 | current_thread = get_lwp_thread (lwp); | |
fa593d66 PA |
2004 | |
2005 | if ((wstat == NULL | |
2006 | || (WIFSTOPPED (*wstat) && WSTOPSIG (*wstat) != SIGTRAP)) | |
2007 | && supports_fast_tracepoints () | |
58b4daa5 | 2008 | && agent_loaded_p ()) |
fa593d66 PA |
2009 | { |
2010 | struct fast_tpoint_collect_status status; | |
fa593d66 PA |
2011 | |
2012 | if (debug_threads) | |
87ce2a04 DE |
2013 | debug_printf ("Checking whether LWP %ld needs to move out of the " |
2014 | "jump pad.\n", | |
0bfdf32f | 2015 | lwpid_of (current_thread)); |
fa593d66 | 2016 | |
229d26fc SM |
2017 | fast_tpoint_collect_result r |
2018 | = linux_fast_tracepoint_collecting (lwp, &status); | |
fa593d66 PA |
2019 | |
2020 | if (wstat == NULL | |
2021 | || (WSTOPSIG (*wstat) != SIGILL | |
2022 | && WSTOPSIG (*wstat) != SIGFPE | |
2023 | && WSTOPSIG (*wstat) != SIGSEGV | |
2024 | && WSTOPSIG (*wstat) != SIGBUS)) | |
2025 | { | |
2026 | lwp->collecting_fast_tracepoint = r; | |
2027 | ||
229d26fc | 2028 | if (r != fast_tpoint_collect_result::not_collecting) |
fa593d66 | 2029 | { |
229d26fc SM |
2030 | if (r == fast_tpoint_collect_result::before_insn |
2031 | && lwp->exit_jump_pad_bkpt == NULL) | |
fa593d66 PA |
2032 | { |
2033 | /* Haven't executed the original instruction yet. | |
2034 | Set breakpoint there, and wait till it's hit, | |
2035 | then single-step until exiting the jump pad. */ | |
2036 | lwp->exit_jump_pad_bkpt | |
2037 | = set_breakpoint_at (status.adjusted_insn_addr, NULL); | |
2038 | } | |
2039 | ||
2040 | if (debug_threads) | |
87ce2a04 DE |
2041 | debug_printf ("Checking whether LWP %ld needs to move out of " |
2042 | "the jump pad...it does\n", | |
0bfdf32f GB |
2043 | lwpid_of (current_thread)); |
2044 | current_thread = saved_thread; | |
fa593d66 | 2045 | |
d16f3f6c | 2046 | return true; |
fa593d66 PA |
2047 | } |
2048 | } | |
2049 | else | |
2050 | { | |
2051 | /* If we get a synchronous signal while collecting, *and* | |
2052 | while executing the (relocated) original instruction, | |
2053 | reset the PC to point at the tpoint address, before | |
2054 | reporting to GDB. Otherwise, it's an IPA lib bug: just | |
2055 | report the signal to GDB, and pray for the best. */ | |
2056 | ||
229d26fc SM |
2057 | lwp->collecting_fast_tracepoint |
2058 | = fast_tpoint_collect_result::not_collecting; | |
fa593d66 | 2059 | |
229d26fc | 2060 | if (r != fast_tpoint_collect_result::not_collecting |
fa593d66 PA |
2061 | && (status.adjusted_insn_addr <= lwp->stop_pc |
2062 | && lwp->stop_pc < status.adjusted_insn_addr_end)) | |
2063 | { | |
2064 | siginfo_t info; | |
2065 | struct regcache *regcache; | |
2066 | ||
2067 | /* The si_addr on a few signals references the address | |
2068 | of the faulting instruction. Adjust that as | |
2069 | well. */ | |
2070 | if ((WSTOPSIG (*wstat) == SIGILL | |
2071 | || WSTOPSIG (*wstat) == SIGFPE | |
2072 | || WSTOPSIG (*wstat) == SIGBUS | |
2073 | || WSTOPSIG (*wstat) == SIGSEGV) | |
0bfdf32f | 2074 | && ptrace (PTRACE_GETSIGINFO, lwpid_of (current_thread), |
b8e1b30e | 2075 | (PTRACE_TYPE_ARG3) 0, &info) == 0 |
fa593d66 PA |
2076 | /* Final check just to make sure we don't clobber |
2077 | the siginfo of non-kernel-sent signals. */ | |
2078 | && (uintptr_t) info.si_addr == lwp->stop_pc) | |
2079 | { | |
2080 | info.si_addr = (void *) (uintptr_t) status.tpoint_addr; | |
0bfdf32f | 2081 | ptrace (PTRACE_SETSIGINFO, lwpid_of (current_thread), |
b8e1b30e | 2082 | (PTRACE_TYPE_ARG3) 0, &info); |
fa593d66 PA |
2083 | } |
2084 | ||
0bfdf32f | 2085 | regcache = get_thread_regcache (current_thread, 1); |
bf9ae9d8 | 2086 | low_set_pc (regcache, status.tpoint_addr); |
fa593d66 PA |
2087 | lwp->stop_pc = status.tpoint_addr; |
2088 | ||
2089 | /* Cancel any fast tracepoint lock this thread was | |
2090 | holding. */ | |
2091 | force_unlock_trace_buffer (); | |
2092 | } | |
2093 | ||
2094 | if (lwp->exit_jump_pad_bkpt != NULL) | |
2095 | { | |
2096 | if (debug_threads) | |
87ce2a04 DE |
2097 | debug_printf ("Cancelling fast exit-jump-pad: removing bkpt. " |
2098 | "stopping all threads momentarily.\n"); | |
fa593d66 PA |
2099 | |
2100 | stop_all_lwps (1, lwp); | |
fa593d66 PA |
2101 | |
2102 | delete_breakpoint (lwp->exit_jump_pad_bkpt); | |
2103 | lwp->exit_jump_pad_bkpt = NULL; | |
2104 | ||
2105 | unstop_all_lwps (1, lwp); | |
2106 | ||
2107 | gdb_assert (lwp->suspended >= 0); | |
2108 | } | |
2109 | } | |
2110 | } | |
2111 | ||
2112 | if (debug_threads) | |
87ce2a04 DE |
2113 | debug_printf ("Checking whether LWP %ld needs to move out of the " |
2114 | "jump pad...no\n", | |
0bfdf32f | 2115 | lwpid_of (current_thread)); |
0cccb683 | 2116 | |
0bfdf32f | 2117 | current_thread = saved_thread; |
d16f3f6c | 2118 | return false; |
fa593d66 PA |
2119 | } |
2120 | ||
2121 | /* Enqueue one signal in the "signals to report later when out of the | |
2122 | jump pad" list. */ | |
2123 | ||
2124 | static void | |
2125 | enqueue_one_deferred_signal (struct lwp_info *lwp, int *wstat) | |
2126 | { | |
2127 | struct pending_signals *p_sig; | |
d86d4aaf | 2128 | struct thread_info *thread = get_lwp_thread (lwp); |
fa593d66 PA |
2129 | |
2130 | if (debug_threads) | |
87ce2a04 | 2131 | debug_printf ("Deferring signal %d for LWP %ld.\n", |
d86d4aaf | 2132 | WSTOPSIG (*wstat), lwpid_of (thread)); |
fa593d66 PA |
2133 | |
2134 | if (debug_threads) | |
2135 | { | |
2136 | struct pending_signals *sig; | |
2137 | ||
2138 | for (sig = lwp->pending_signals_to_report; | |
2139 | sig != NULL; | |
2140 | sig = sig->prev) | |
87ce2a04 DE |
2141 | debug_printf (" Already queued %d\n", |
2142 | sig->signal); | |
fa593d66 | 2143 | |
87ce2a04 | 2144 | debug_printf (" (no more currently queued signals)\n"); |
fa593d66 PA |
2145 | } |
2146 | ||
1a981360 PA |
2147 | /* Don't enqueue non-RT signals if they are already in the deferred |
2148 | queue. (SIGSTOP being the easiest signal to see ending up here | |
2149 | twice) */ | |
2150 | if (WSTOPSIG (*wstat) < __SIGRTMIN) | |
2151 | { | |
2152 | struct pending_signals *sig; | |
2153 | ||
2154 | for (sig = lwp->pending_signals_to_report; | |
2155 | sig != NULL; | |
2156 | sig = sig->prev) | |
2157 | { | |
2158 | if (sig->signal == WSTOPSIG (*wstat)) | |
2159 | { | |
2160 | if (debug_threads) | |
87ce2a04 DE |
2161 | debug_printf ("Not requeuing already queued non-RT signal %d" |
2162 | " for LWP %ld\n", | |
2163 | sig->signal, | |
d86d4aaf | 2164 | lwpid_of (thread)); |
1a981360 PA |
2165 | return; |
2166 | } | |
2167 | } | |
2168 | } | |
2169 | ||
8d749320 | 2170 | p_sig = XCNEW (struct pending_signals); |
fa593d66 PA |
2171 | p_sig->prev = lwp->pending_signals_to_report; |
2172 | p_sig->signal = WSTOPSIG (*wstat); | |
8d749320 | 2173 | |
d86d4aaf | 2174 | ptrace (PTRACE_GETSIGINFO, lwpid_of (thread), (PTRACE_TYPE_ARG3) 0, |
56f7af9c | 2175 | &p_sig->info); |
fa593d66 PA |
2176 | |
2177 | lwp->pending_signals_to_report = p_sig; | |
2178 | } | |
2179 | ||
2180 | /* Dequeue one signal from the "signals to report later when out of | |
2181 | the jump pad" list. */ | |
2182 | ||
2183 | static int | |
2184 | dequeue_one_deferred_signal (struct lwp_info *lwp, int *wstat) | |
2185 | { | |
d86d4aaf DE |
2186 | struct thread_info *thread = get_lwp_thread (lwp); |
2187 | ||
fa593d66 PA |
2188 | if (lwp->pending_signals_to_report != NULL) |
2189 | { | |
2190 | struct pending_signals **p_sig; | |
2191 | ||
2192 | p_sig = &lwp->pending_signals_to_report; | |
2193 | while ((*p_sig)->prev != NULL) | |
2194 | p_sig = &(*p_sig)->prev; | |
2195 | ||
2196 | *wstat = W_STOPCODE ((*p_sig)->signal); | |
2197 | if ((*p_sig)->info.si_signo != 0) | |
d86d4aaf | 2198 | ptrace (PTRACE_SETSIGINFO, lwpid_of (thread), (PTRACE_TYPE_ARG3) 0, |
56f7af9c | 2199 | &(*p_sig)->info); |
fa593d66 PA |
2200 | free (*p_sig); |
2201 | *p_sig = NULL; | |
2202 | ||
2203 | if (debug_threads) | |
87ce2a04 | 2204 | debug_printf ("Reporting deferred signal %d for LWP %ld.\n", |
d86d4aaf | 2205 | WSTOPSIG (*wstat), lwpid_of (thread)); |
fa593d66 PA |
2206 | |
2207 | if (debug_threads) | |
2208 | { | |
2209 | struct pending_signals *sig; | |
2210 | ||
2211 | for (sig = lwp->pending_signals_to_report; | |
2212 | sig != NULL; | |
2213 | sig = sig->prev) | |
87ce2a04 DE |
2214 | debug_printf (" Still queued %d\n", |
2215 | sig->signal); | |
fa593d66 | 2216 | |
87ce2a04 | 2217 | debug_printf (" (no more queued signals)\n"); |
fa593d66 PA |
2218 | } |
2219 | ||
2220 | return 1; | |
2221 | } | |
2222 | ||
2223 | return 0; | |
2224 | } | |
2225 | ||
ac1bbaca TBA |
2226 | bool |
2227 | linux_process_target::check_stopped_by_watchpoint (lwp_info *child) | |
582511be | 2228 | { |
ac1bbaca TBA |
2229 | struct thread_info *saved_thread = current_thread; |
2230 | current_thread = get_lwp_thread (child); | |
d50171e4 | 2231 | |
ac1bbaca TBA |
2232 | if (low_stopped_by_watchpoint ()) |
2233 | { | |
2234 | child->stop_reason = TARGET_STOPPED_BY_WATCHPOINT; | |
2235 | child->stopped_data_address = low_stopped_data_address (); | |
2236 | } | |
582511be | 2237 | |
ac1bbaca | 2238 | current_thread = saved_thread; |
582511be | 2239 | |
ac1bbaca TBA |
2240 | return child->stop_reason == TARGET_STOPPED_BY_WATCHPOINT; |
2241 | } | |
d50171e4 | 2242 | |
ac1bbaca TBA |
2243 | bool |
2244 | linux_process_target::low_stopped_by_watchpoint () | |
2245 | { | |
2246 | return false; | |
2247 | } | |
d50171e4 | 2248 | |
ac1bbaca TBA |
2249 | CORE_ADDR |
2250 | linux_process_target::low_stopped_data_address () | |
2251 | { | |
2252 | return 0; | |
c4d9ceb6 YQ |
2253 | } |
2254 | ||
de0d863e DB |
2255 | /* Return the ptrace options that we want to try to enable. */ |
2256 | ||
2257 | static int | |
2258 | linux_low_ptrace_options (int attached) | |
2259 | { | |
c12a5089 | 2260 | client_state &cs = get_client_state (); |
de0d863e DB |
2261 | int options = 0; |
2262 | ||
2263 | if (!attached) | |
2264 | options |= PTRACE_O_EXITKILL; | |
2265 | ||
c12a5089 | 2266 | if (cs.report_fork_events) |
de0d863e DB |
2267 | options |= PTRACE_O_TRACEFORK; |
2268 | ||
c12a5089 | 2269 | if (cs.report_vfork_events) |
c269dbdb DB |
2270 | options |= (PTRACE_O_TRACEVFORK | PTRACE_O_TRACEVFORKDONE); |
2271 | ||
c12a5089 | 2272 | if (cs.report_exec_events) |
94585166 DB |
2273 | options |= PTRACE_O_TRACEEXEC; |
2274 | ||
82075af2 JS |
2275 | options |= PTRACE_O_TRACESYSGOOD; |
2276 | ||
de0d863e DB |
2277 | return options; |
2278 | } | |
2279 | ||
d16f3f6c TBA |
2280 | lwp_info * |
2281 | linux_process_target::filter_event (int lwpid, int wstat) | |
fa96cb38 | 2282 | { |
c12a5089 | 2283 | client_state &cs = get_client_state (); |
fa96cb38 PA |
2284 | struct lwp_info *child; |
2285 | struct thread_info *thread; | |
582511be | 2286 | int have_stop_pc = 0; |
fa96cb38 | 2287 | |
f2907e49 | 2288 | child = find_lwp_pid (ptid_t (lwpid)); |
fa96cb38 | 2289 | |
94585166 DB |
2290 | /* Check for stop events reported by a process we didn't already |
2291 | know about - anything not already in our LWP list. | |
2292 | ||
2293 | If we're expecting to receive stopped processes after | |
2294 | fork, vfork, and clone events, then we'll just add the | |
2295 | new one to our list and go back to waiting for the event | |
2296 | to be reported - the stopped process might be returned | |
2297 | from waitpid before or after the event is. | |
2298 | ||
2299 | But note the case of a non-leader thread exec'ing after the | |
2300 | leader having exited, and gone from our lists (because | |
2301 | check_zombie_leaders deleted it). The non-leader thread | |
2302 | changes its tid to the tgid. */ | |
2303 | ||
2304 | if (WIFSTOPPED (wstat) && child == NULL && WSTOPSIG (wstat) == SIGTRAP | |
2305 | && linux_ptrace_get_extended_event (wstat) == PTRACE_EVENT_EXEC) | |
2306 | { | |
2307 | ptid_t child_ptid; | |
2308 | ||
2309 | /* A multi-thread exec after we had seen the leader exiting. */ | |
2310 | if (debug_threads) | |
2311 | { | |
2312 | debug_printf ("LLW: Re-adding thread group leader LWP %d" | |
2313 | "after exec.\n", lwpid); | |
2314 | } | |
2315 | ||
fd79271b | 2316 | child_ptid = ptid_t (lwpid, lwpid, 0); |
94585166 DB |
2317 | child = add_lwp (child_ptid); |
2318 | child->stopped = 1; | |
2319 | current_thread = child->thread; | |
2320 | } | |
2321 | ||
fa96cb38 PA |
2322 | /* If we didn't find a process, one of two things presumably happened: |
2323 | - A process we started and then detached from has exited. Ignore it. | |
2324 | - A process we are controlling has forked and the new child's stop | |
2325 | was reported to us by the kernel. Save its PID. */ | |
2326 | if (child == NULL && WIFSTOPPED (wstat)) | |
2327 | { | |
2328 | add_to_pid_list (&stopped_pids, lwpid, wstat); | |
2329 | return NULL; | |
2330 | } | |
2331 | else if (child == NULL) | |
2332 | return NULL; | |
2333 | ||
2334 | thread = get_lwp_thread (child); | |
2335 | ||
2336 | child->stopped = 1; | |
2337 | ||
2338 | child->last_status = wstat; | |
2339 | ||
582511be PA |
2340 | /* Check if the thread has exited. */ |
2341 | if ((WIFEXITED (wstat) || WIFSIGNALED (wstat))) | |
2342 | { | |
2343 | if (debug_threads) | |
2344 | debug_printf ("LLFE: %d exited.\n", lwpid); | |
f50bf8e5 YQ |
2345 | |
2346 | if (finish_step_over (child)) | |
2347 | { | |
2348 | /* Unsuspend all other LWPs, and set them back running again. */ | |
2349 | unsuspend_all_lwps (child); | |
2350 | } | |
2351 | ||
65706a29 PA |
2352 | /* If there is at least one more LWP, then the exit signal was |
2353 | not the end of the debugged application and should be | |
2354 | ignored, unless GDB wants to hear about thread exits. */ | |
c12a5089 | 2355 | if (cs.report_thread_events |
65706a29 | 2356 | || last_thread_of_process_p (pid_of (thread))) |
582511be | 2357 | { |
65706a29 PA |
2358 | /* Since events are serialized to GDB core, and we can't |
2359 | report this one right now. Leave the status pending for | |
2360 | the next time we're able to report it. */ | |
2361 | mark_lwp_dead (child, wstat); | |
2362 | return child; | |
582511be PA |
2363 | } |
2364 | else | |
2365 | { | |
65706a29 PA |
2366 | delete_lwp (child); |
2367 | return NULL; | |
582511be PA |
2368 | } |
2369 | } | |
2370 | ||
2371 | gdb_assert (WIFSTOPPED (wstat)); | |
2372 | ||
fa96cb38 PA |
2373 | if (WIFSTOPPED (wstat)) |
2374 | { | |
2375 | struct process_info *proc; | |
2376 | ||
c06cbd92 | 2377 | /* Architecture-specific setup after inferior is running. */ |
fa96cb38 | 2378 | proc = find_process_pid (pid_of (thread)); |
c06cbd92 | 2379 | if (proc->tdesc == NULL) |
fa96cb38 | 2380 | { |
c06cbd92 YQ |
2381 | if (proc->attached) |
2382 | { | |
c06cbd92 YQ |
2383 | /* This needs to happen after we have attached to the |
2384 | inferior and it is stopped for the first time, but | |
2385 | before we access any inferior registers. */ | |
797bcff5 | 2386 | arch_setup_thread (thread); |
c06cbd92 YQ |
2387 | } |
2388 | else | |
2389 | { | |
2390 | /* The process is started, but GDBserver will do | |
2391 | architecture-specific setup after the program stops at | |
2392 | the first instruction. */ | |
2393 | child->status_pending_p = 1; | |
2394 | child->status_pending = wstat; | |
2395 | return child; | |
2396 | } | |
fa96cb38 PA |
2397 | } |
2398 | } | |
2399 | ||
fa96cb38 PA |
2400 | if (WIFSTOPPED (wstat) && child->must_set_ptrace_flags) |
2401 | { | |
beed38b8 | 2402 | struct process_info *proc = find_process_pid (pid_of (thread)); |
de0d863e | 2403 | int options = linux_low_ptrace_options (proc->attached); |
beed38b8 | 2404 | |
de0d863e | 2405 | linux_enable_event_reporting (lwpid, options); |
fa96cb38 PA |
2406 | child->must_set_ptrace_flags = 0; |
2407 | } | |
2408 | ||
82075af2 JS |
2409 | /* Always update syscall_state, even if it will be filtered later. */ |
2410 | if (WIFSTOPPED (wstat) && WSTOPSIG (wstat) == SYSCALL_SIGTRAP) | |
2411 | { | |
2412 | child->syscall_state | |
2413 | = (child->syscall_state == TARGET_WAITKIND_SYSCALL_ENTRY | |
2414 | ? TARGET_WAITKIND_SYSCALL_RETURN | |
2415 | : TARGET_WAITKIND_SYSCALL_ENTRY); | |
2416 | } | |
2417 | else | |
2418 | { | |
2419 | /* Almost all other ptrace-stops are known to be outside of system | |
2420 | calls, with further exceptions in handle_extended_wait. */ | |
2421 | child->syscall_state = TARGET_WAITKIND_IGNORE; | |
2422 | } | |
2423 | ||
e7ad2f14 PA |
2424 | /* Be careful to not overwrite stop_pc until save_stop_reason is |
2425 | called. */ | |
fa96cb38 | 2426 | if (WIFSTOPPED (wstat) && WSTOPSIG (wstat) == SIGTRAP |
89a5711c | 2427 | && linux_is_extended_waitstatus (wstat)) |
fa96cb38 | 2428 | { |
582511be | 2429 | child->stop_pc = get_pc (child); |
94585166 | 2430 | if (handle_extended_wait (&child, wstat)) |
de0d863e DB |
2431 | { |
2432 | /* The event has been handled, so just return without | |
2433 | reporting it. */ | |
2434 | return NULL; | |
2435 | } | |
fa96cb38 PA |
2436 | } |
2437 | ||
80aea927 | 2438 | if (linux_wstatus_maybe_breakpoint (wstat)) |
582511be | 2439 | { |
e7ad2f14 | 2440 | if (save_stop_reason (child)) |
582511be PA |
2441 | have_stop_pc = 1; |
2442 | } | |
2443 | ||
2444 | if (!have_stop_pc) | |
2445 | child->stop_pc = get_pc (child); | |
2446 | ||
fa96cb38 PA |
2447 | if (WIFSTOPPED (wstat) && WSTOPSIG (wstat) == SIGSTOP |
2448 | && child->stop_expected) | |
2449 | { | |
2450 | if (debug_threads) | |
2451 | debug_printf ("Expected stop.\n"); | |
2452 | child->stop_expected = 0; | |
2453 | ||
2454 | if (thread->last_resume_kind == resume_stop) | |
2455 | { | |
2456 | /* We want to report the stop to the core. Treat the | |
2457 | SIGSTOP as a normal event. */ | |
2bf6fb9d PA |
2458 | if (debug_threads) |
2459 | debug_printf ("LLW: resume_stop SIGSTOP caught for %s.\n", | |
2460 | target_pid_to_str (ptid_of (thread))); | |
fa96cb38 PA |
2461 | } |
2462 | else if (stopping_threads != NOT_STOPPING_THREADS) | |
2463 | { | |
2464 | /* Stopping threads. We don't want this SIGSTOP to end up | |
582511be | 2465 | pending. */ |
2bf6fb9d PA |
2466 | if (debug_threads) |
2467 | debug_printf ("LLW: SIGSTOP caught for %s " | |
2468 | "while stopping threads.\n", | |
2469 | target_pid_to_str (ptid_of (thread))); | |
fa96cb38 PA |
2470 | return NULL; |
2471 | } | |
2472 | else | |
2473 | { | |
2bf6fb9d PA |
2474 | /* This is a delayed SIGSTOP. Filter out the event. */ |
2475 | if (debug_threads) | |
2476 | debug_printf ("LLW: %s %s, 0, 0 (discard delayed SIGSTOP)\n", | |
2477 | child->stepping ? "step" : "continue", | |
2478 | target_pid_to_str (ptid_of (thread))); | |
2479 | ||
df95181f | 2480 | resume_one_lwp (child, child->stepping, 0, NULL); |
fa96cb38 PA |
2481 | return NULL; |
2482 | } | |
2483 | } | |
2484 | ||
582511be PA |
2485 | child->status_pending_p = 1; |
2486 | child->status_pending = wstat; | |
fa96cb38 PA |
2487 | return child; |
2488 | } | |
2489 | ||
b31cdfa6 TBA |
2490 | bool |
2491 | linux_process_target::maybe_hw_step (thread_info *thread) | |
f79b145d | 2492 | { |
b31cdfa6 TBA |
2493 | if (supports_hardware_single_step ()) |
2494 | return true; | |
f79b145d YQ |
2495 | else |
2496 | { | |
3b9a79ef | 2497 | /* GDBserver must insert single-step breakpoint for software |
f79b145d | 2498 | single step. */ |
3b9a79ef | 2499 | gdb_assert (has_single_step_breakpoints (thread)); |
b31cdfa6 | 2500 | return false; |
f79b145d YQ |
2501 | } |
2502 | } | |
2503 | ||
df95181f TBA |
2504 | void |
2505 | linux_process_target::resume_stopped_resumed_lwps (thread_info *thread) | |
20ba1ce6 | 2506 | { |
20ba1ce6 PA |
2507 | struct lwp_info *lp = get_thread_lwp (thread); |
2508 | ||
2509 | if (lp->stopped | |
863d01bd | 2510 | && !lp->suspended |
20ba1ce6 | 2511 | && !lp->status_pending_p |
20ba1ce6 PA |
2512 | && thread->last_status.kind == TARGET_WAITKIND_IGNORE) |
2513 | { | |
8901d193 YQ |
2514 | int step = 0; |
2515 | ||
2516 | if (thread->last_resume_kind == resume_step) | |
2517 | step = maybe_hw_step (thread); | |
20ba1ce6 PA |
2518 | |
2519 | if (debug_threads) | |
2520 | debug_printf ("RSRL: resuming stopped-resumed LWP %s at %s: step=%d\n", | |
2521 | target_pid_to_str (ptid_of (thread)), | |
2522 | paddress (lp->stop_pc), | |
2523 | step); | |
2524 | ||
df95181f | 2525 | resume_one_lwp (lp, step, GDB_SIGNAL_0, NULL); |
20ba1ce6 PA |
2526 | } |
2527 | } | |
2528 | ||
d16f3f6c TBA |
2529 | int |
2530 | linux_process_target::wait_for_event_filtered (ptid_t wait_ptid, | |
2531 | ptid_t filter_ptid, | |
2532 | int *wstatp, int options) | |
0d62e5e8 | 2533 | { |
d86d4aaf | 2534 | struct thread_info *event_thread; |
d50171e4 | 2535 | struct lwp_info *event_child, *requested_child; |
fa96cb38 | 2536 | sigset_t block_mask, prev_mask; |
d50171e4 | 2537 | |
fa96cb38 | 2538 | retry: |
d86d4aaf DE |
2539 | /* N.B. event_thread points to the thread_info struct that contains |
2540 | event_child. Keep them in sync. */ | |
2541 | event_thread = NULL; | |
d50171e4 PA |
2542 | event_child = NULL; |
2543 | requested_child = NULL; | |
0d62e5e8 | 2544 | |
95954743 | 2545 | /* Check for a lwp with a pending status. */ |
bd99dc85 | 2546 | |
d7e15655 | 2547 | if (filter_ptid == minus_one_ptid || filter_ptid.is_pid ()) |
0d62e5e8 | 2548 | { |
83e1b6c1 SM |
2549 | event_thread = find_thread_in_random ([&] (thread_info *thread) |
2550 | { | |
2551 | return status_pending_p_callback (thread, filter_ptid); | |
2552 | }); | |
2553 | ||
d86d4aaf DE |
2554 | if (event_thread != NULL) |
2555 | event_child = get_thread_lwp (event_thread); | |
2556 | if (debug_threads && event_thread) | |
2557 | debug_printf ("Got a pending child %ld\n", lwpid_of (event_thread)); | |
0d62e5e8 | 2558 | } |
d7e15655 | 2559 | else if (filter_ptid != null_ptid) |
0d62e5e8 | 2560 | { |
fa96cb38 | 2561 | requested_child = find_lwp_pid (filter_ptid); |
d50171e4 | 2562 | |
bde24c0a | 2563 | if (stopping_threads == NOT_STOPPING_THREADS |
fa593d66 | 2564 | && requested_child->status_pending_p |
229d26fc SM |
2565 | && (requested_child->collecting_fast_tracepoint |
2566 | != fast_tpoint_collect_result::not_collecting)) | |
fa593d66 PA |
2567 | { |
2568 | enqueue_one_deferred_signal (requested_child, | |
2569 | &requested_child->status_pending); | |
2570 | requested_child->status_pending_p = 0; | |
2571 | requested_child->status_pending = 0; | |
df95181f | 2572 | resume_one_lwp (requested_child, 0, 0, NULL); |
fa593d66 PA |
2573 | } |
2574 | ||
2575 | if (requested_child->suspended | |
2576 | && requested_child->status_pending_p) | |
38e08fca GB |
2577 | { |
2578 | internal_error (__FILE__, __LINE__, | |
2579 | "requesting an event out of a" | |
2580 | " suspended child?"); | |
2581 | } | |
fa593d66 | 2582 | |
d50171e4 | 2583 | if (requested_child->status_pending_p) |
d86d4aaf DE |
2584 | { |
2585 | event_child = requested_child; | |
2586 | event_thread = get_lwp_thread (event_child); | |
2587 | } | |
0d62e5e8 | 2588 | } |
611cb4a5 | 2589 | |
0d62e5e8 DJ |
2590 | if (event_child != NULL) |
2591 | { | |
bd99dc85 | 2592 | if (debug_threads) |
87ce2a04 | 2593 | debug_printf ("Got an event from pending child %ld (%04x)\n", |
d86d4aaf | 2594 | lwpid_of (event_thread), event_child->status_pending); |
fa96cb38 | 2595 | *wstatp = event_child->status_pending; |
bd99dc85 PA |
2596 | event_child->status_pending_p = 0; |
2597 | event_child->status_pending = 0; | |
0bfdf32f | 2598 | current_thread = event_thread; |
d86d4aaf | 2599 | return lwpid_of (event_thread); |
0d62e5e8 DJ |
2600 | } |
2601 | ||
fa96cb38 PA |
2602 | /* But if we don't find a pending event, we'll have to wait. |
2603 | ||
2604 | We only enter this loop if no process has a pending wait status. | |
2605 | Thus any action taken in response to a wait status inside this | |
2606 | loop is responding as soon as we detect the status, not after any | |
2607 | pending events. */ | |
d8301ad1 | 2608 | |
fa96cb38 PA |
2609 | /* Make sure SIGCHLD is blocked until the sigsuspend below. Block |
2610 | all signals while here. */ | |
2611 | sigfillset (&block_mask); | |
21987b9c | 2612 | gdb_sigmask (SIG_BLOCK, &block_mask, &prev_mask); |
fa96cb38 | 2613 | |
582511be PA |
2614 | /* Always pull all events out of the kernel. We'll randomly select |
2615 | an event LWP out of all that have events, to prevent | |
2616 | starvation. */ | |
fa96cb38 | 2617 | while (event_child == NULL) |
0d62e5e8 | 2618 | { |
fa96cb38 | 2619 | pid_t ret = 0; |
0d62e5e8 | 2620 | |
fa96cb38 PA |
2621 | /* Always use -1 and WNOHANG, due to couple of a kernel/ptrace |
2622 | quirks: | |
0d62e5e8 | 2623 | |
fa96cb38 PA |
2624 | - If the thread group leader exits while other threads in the |
2625 | thread group still exist, waitpid(TGID, ...) hangs. That | |
2626 | waitpid won't return an exit status until the other threads | |
2627 | in the group are reaped. | |
611cb4a5 | 2628 | |
fa96cb38 PA |
2629 | - When a non-leader thread execs, that thread just vanishes |
2630 | without reporting an exit (so we'd hang if we waited for it | |
2631 | explicitly in that case). The exec event is reported to | |
94585166 | 2632 | the TGID pid. */ |
fa96cb38 PA |
2633 | errno = 0; |
2634 | ret = my_waitpid (-1, wstatp, options | WNOHANG); | |
d8301ad1 | 2635 | |
fa96cb38 PA |
2636 | if (debug_threads) |
2637 | debug_printf ("LWFE: waitpid(-1, ...) returned %d, %s\n", | |
6d91ce9a | 2638 | ret, errno ? safe_strerror (errno) : "ERRNO-OK"); |
0d62e5e8 | 2639 | |
fa96cb38 | 2640 | if (ret > 0) |
0d62e5e8 | 2641 | { |
89be2091 | 2642 | if (debug_threads) |
bd99dc85 | 2643 | { |
fa96cb38 PA |
2644 | debug_printf ("LLW: waitpid %ld received %s\n", |
2645 | (long) ret, status_to_str (*wstatp)); | |
bd99dc85 | 2646 | } |
89be2091 | 2647 | |
582511be PA |
2648 | /* Filter all events. IOW, leave all events pending. We'll |
2649 | randomly select an event LWP out of all that have events | |
2650 | below. */ | |
d16f3f6c | 2651 | filter_event (ret, *wstatp); |
fa96cb38 PA |
2652 | /* Retry until nothing comes out of waitpid. A single |
2653 | SIGCHLD can indicate more than one child stopped. */ | |
89be2091 DJ |
2654 | continue; |
2655 | } | |
2656 | ||
20ba1ce6 PA |
2657 | /* Now that we've pulled all events out of the kernel, resume |
2658 | LWPs that don't have an interesting event to report. */ | |
2659 | if (stopping_threads == NOT_STOPPING_THREADS) | |
df95181f TBA |
2660 | for_each_thread ([this] (thread_info *thread) |
2661 | { | |
2662 | resume_stopped_resumed_lwps (thread); | |
2663 | }); | |
20ba1ce6 PA |
2664 | |
2665 | /* ... and find an LWP with a status to report to the core, if | |
2666 | any. */ | |
83e1b6c1 SM |
2667 | event_thread = find_thread_in_random ([&] (thread_info *thread) |
2668 | { | |
2669 | return status_pending_p_callback (thread, filter_ptid); | |
2670 | }); | |
2671 | ||
582511be PA |
2672 | if (event_thread != NULL) |
2673 | { | |
2674 | event_child = get_thread_lwp (event_thread); | |
2675 | *wstatp = event_child->status_pending; | |
2676 | event_child->status_pending_p = 0; | |
2677 | event_child->status_pending = 0; | |
2678 | break; | |
2679 | } | |
2680 | ||
fa96cb38 PA |
2681 | /* Check for zombie thread group leaders. Those can't be reaped |
2682 | until all other threads in the thread group are. */ | |
2683 | check_zombie_leaders (); | |
2684 | ||
a1385b7b SM |
2685 | auto not_stopped = [&] (thread_info *thread) |
2686 | { | |
2687 | return not_stopped_callback (thread, wait_ptid); | |
2688 | }; | |
2689 | ||
fa96cb38 PA |
2690 | /* If there are no resumed children left in the set of LWPs we |
2691 | want to wait for, bail. We can't just block in | |
2692 | waitpid/sigsuspend, because lwps might have been left stopped | |
2693 | in trace-stop state, and we'd be stuck forever waiting for | |
2694 | their status to change (which would only happen if we resumed | |
2695 | them). Even if WNOHANG is set, this return code is preferred | |
2696 | over 0 (below), as it is more detailed. */ | |
a1385b7b | 2697 | if (find_thread (not_stopped) == NULL) |
a6dbe5df | 2698 | { |
fa96cb38 PA |
2699 | if (debug_threads) |
2700 | debug_printf ("LLW: exit (no unwaited-for LWP)\n"); | |
21987b9c | 2701 | gdb_sigmask (SIG_SETMASK, &prev_mask, NULL); |
fa96cb38 | 2702 | return -1; |
a6dbe5df PA |
2703 | } |
2704 | ||
fa96cb38 PA |
2705 | /* No interesting event to report to the caller. */ |
2706 | if ((options & WNOHANG)) | |
24a09b5f | 2707 | { |
fa96cb38 PA |
2708 | if (debug_threads) |
2709 | debug_printf ("WNOHANG set, no event found\n"); | |
2710 | ||
21987b9c | 2711 | gdb_sigmask (SIG_SETMASK, &prev_mask, NULL); |
fa96cb38 | 2712 | return 0; |
24a09b5f DJ |
2713 | } |
2714 | ||
fa96cb38 PA |
2715 | /* Block until we get an event reported with SIGCHLD. */ |
2716 | if (debug_threads) | |
2717 | debug_printf ("sigsuspend'ing\n"); | |
d50171e4 | 2718 | |
fa96cb38 | 2719 | sigsuspend (&prev_mask); |
21987b9c | 2720 | gdb_sigmask (SIG_SETMASK, &prev_mask, NULL); |
fa96cb38 PA |
2721 | goto retry; |
2722 | } | |
d50171e4 | 2723 | |
21987b9c | 2724 | gdb_sigmask (SIG_SETMASK, &prev_mask, NULL); |
d50171e4 | 2725 | |
0bfdf32f | 2726 | current_thread = event_thread; |
d50171e4 | 2727 | |
fa96cb38 PA |
2728 | return lwpid_of (event_thread); |
2729 | } | |
2730 | ||
d16f3f6c TBA |
2731 | int |
2732 | linux_process_target::wait_for_event (ptid_t ptid, int *wstatp, int options) | |
fa96cb38 | 2733 | { |
d16f3f6c | 2734 | return wait_for_event_filtered (ptid, ptid, wstatp, options); |
611cb4a5 DJ |
2735 | } |
2736 | ||
6bf5e0ba PA |
2737 | /* Select one LWP out of those that have events pending. */ |
2738 | ||
2739 | static void | |
2740 | select_event_lwp (struct lwp_info **orig_lp) | |
2741 | { | |
582511be PA |
2742 | struct thread_info *event_thread = NULL; |
2743 | ||
2744 | /* In all-stop, give preference to the LWP that is being | |
2745 | single-stepped. There will be at most one, and it's the LWP that | |
2746 | the core is most interested in. If we didn't do this, then we'd | |
2747 | have to handle pending step SIGTRAPs somehow in case the core | |
2748 | later continues the previously-stepped thread, otherwise we'd | |
2749 | report the pending SIGTRAP, and the core, not having stepped the | |
2750 | thread, wouldn't understand what the trap was for, and therefore | |
2751 | would report it to the user as a random signal. */ | |
2752 | if (!non_stop) | |
6bf5e0ba | 2753 | { |
39a64da5 SM |
2754 | event_thread = find_thread ([] (thread_info *thread) |
2755 | { | |
2756 | lwp_info *lp = get_thread_lwp (thread); | |
2757 | ||
2758 | return (thread->last_status.kind == TARGET_WAITKIND_IGNORE | |
2759 | && thread->last_resume_kind == resume_step | |
2760 | && lp->status_pending_p); | |
2761 | }); | |
2762 | ||
582511be PA |
2763 | if (event_thread != NULL) |
2764 | { | |
2765 | if (debug_threads) | |
2766 | debug_printf ("SEL: Select single-step %s\n", | |
2767 | target_pid_to_str (ptid_of (event_thread))); | |
2768 | } | |
6bf5e0ba | 2769 | } |
582511be | 2770 | if (event_thread == NULL) |
6bf5e0ba PA |
2771 | { |
2772 | /* No single-stepping LWP. Select one at random, out of those | |
b90fc188 | 2773 | which have had events. */ |
6bf5e0ba | 2774 | |
b0319eaa | 2775 | event_thread = find_thread_in_random ([&] (thread_info *thread) |
39a64da5 SM |
2776 | { |
2777 | lwp_info *lp = get_thread_lwp (thread); | |
2778 | ||
b0319eaa TT |
2779 | /* Only resumed LWPs that have an event pending. */ |
2780 | return (thread->last_status.kind == TARGET_WAITKIND_IGNORE | |
2781 | && lp->status_pending_p); | |
39a64da5 | 2782 | }); |
6bf5e0ba PA |
2783 | } |
2784 | ||
d86d4aaf | 2785 | if (event_thread != NULL) |
6bf5e0ba | 2786 | { |
d86d4aaf DE |
2787 | struct lwp_info *event_lp = get_thread_lwp (event_thread); |
2788 | ||
6bf5e0ba PA |
2789 | /* Switch the event LWP. */ |
2790 | *orig_lp = event_lp; | |
2791 | } | |
2792 | } | |
2793 | ||
7984d532 PA |
2794 | /* Decrement the suspend count of all LWPs, except EXCEPT, if non |
2795 | NULL. */ | |
2796 | ||
2797 | static void | |
2798 | unsuspend_all_lwps (struct lwp_info *except) | |
2799 | { | |
139720c5 SM |
2800 | for_each_thread ([&] (thread_info *thread) |
2801 | { | |
2802 | lwp_info *lwp = get_thread_lwp (thread); | |
2803 | ||
2804 | if (lwp != except) | |
2805 | lwp_suspended_decr (lwp); | |
2806 | }); | |
7984d532 PA |
2807 | } |
2808 | ||
5a6b0a41 | 2809 | static bool lwp_running (thread_info *thread); |
fa593d66 PA |
2810 | |
2811 | /* Stabilize threads (move out of jump pads). | |
2812 | ||
2813 | If a thread is midway collecting a fast tracepoint, we need to | |
2814 | finish the collection and move it out of the jump pad before | |
2815 | reporting the signal. | |
2816 | ||
2817 | This avoids recursion while collecting (when a signal arrives | |
2818 | midway, and the signal handler itself collects), which would trash | |
2819 | the trace buffer. In case the user set a breakpoint in a signal | |
2820 | handler, this avoids the backtrace showing the jump pad, etc.. | |
2821 | Most importantly, there are certain things we can't do safely if | |
2822 | threads are stopped in a jump pad (or in its callee's). For | |
2823 | example: | |
2824 | ||
2825 | - starting a new trace run. A thread still collecting the | |
2826 | previous run, could trash the trace buffer when resumed. The trace | |
2827 | buffer control structures would have been reset but the thread had | |
2828 | no way to tell. The thread could even midway memcpy'ing to the | |
2829 | buffer, which would mean that when resumed, it would clobber the | |
2830 | trace buffer that had been set for a new run. | |
2831 | ||
2832 | - we can't rewrite/reuse the jump pads for new tracepoints | |
2833 | safely. Say you do tstart while a thread is stopped midway while | |
2834 | collecting. When the thread is later resumed, it finishes the | |
2835 | collection, and returns to the jump pad, to execute the original | |
2836 | instruction that was under the tracepoint jump at the time the | |
2837 | older run had been started. If the jump pad had been rewritten | |
2838 | since for something else in the new run, the thread would now | |
2839 | execute the wrong / random instructions. */ | |
2840 | ||
5c9eb2f2 TBA |
2841 | void |
2842 | linux_process_target::stabilize_threads () | |
fa593d66 | 2843 | { |
13e567af TBA |
2844 | thread_info *thread_stuck = find_thread ([this] (thread_info *thread) |
2845 | { | |
2846 | return stuck_in_jump_pad (thread); | |
2847 | }); | |
fa593d66 | 2848 | |
d86d4aaf | 2849 | if (thread_stuck != NULL) |
fa593d66 | 2850 | { |
b4d51a55 | 2851 | if (debug_threads) |
87ce2a04 | 2852 | debug_printf ("can't stabilize, LWP %ld is stuck in jump pad\n", |
d86d4aaf | 2853 | lwpid_of (thread_stuck)); |
fa593d66 PA |
2854 | return; |
2855 | } | |
2856 | ||
fcb056a5 | 2857 | thread_info *saved_thread = current_thread; |
fa593d66 PA |
2858 | |
2859 | stabilizing_threads = 1; | |
2860 | ||
2861 | /* Kick 'em all. */ | |
d16f3f6c TBA |
2862 | for_each_thread ([this] (thread_info *thread) |
2863 | { | |
2864 | move_out_of_jump_pad (thread); | |
2865 | }); | |
fa593d66 PA |
2866 | |
2867 | /* Loop until all are stopped out of the jump pads. */ | |
5a6b0a41 | 2868 | while (find_thread (lwp_running) != NULL) |
fa593d66 PA |
2869 | { |
2870 | struct target_waitstatus ourstatus; | |
2871 | struct lwp_info *lwp; | |
fa593d66 PA |
2872 | int wstat; |
2873 | ||
2874 | /* Note that we go through the full wait even loop. While | |
2875 | moving threads out of jump pad, we need to be able to step | |
2876 | over internal breakpoints and such. */ | |
d16f3f6c | 2877 | wait_1 (minus_one_ptid, &ourstatus, 0); |
fa593d66 PA |
2878 | |
2879 | if (ourstatus.kind == TARGET_WAITKIND_STOPPED) | |
2880 | { | |
0bfdf32f | 2881 | lwp = get_thread_lwp (current_thread); |
fa593d66 PA |
2882 | |
2883 | /* Lock it. */ | |
863d01bd | 2884 | lwp_suspended_inc (lwp); |
fa593d66 | 2885 | |
a493e3e2 | 2886 | if (ourstatus.value.sig != GDB_SIGNAL_0 |
0bfdf32f | 2887 | || current_thread->last_resume_kind == resume_stop) |
fa593d66 | 2888 | { |
2ea28649 | 2889 | wstat = W_STOPCODE (gdb_signal_to_host (ourstatus.value.sig)); |
fa593d66 PA |
2890 | enqueue_one_deferred_signal (lwp, &wstat); |
2891 | } | |
2892 | } | |
2893 | } | |
2894 | ||
fcdad592 | 2895 | unsuspend_all_lwps (NULL); |
fa593d66 PA |
2896 | |
2897 | stabilizing_threads = 0; | |
2898 | ||
0bfdf32f | 2899 | current_thread = saved_thread; |
fa593d66 | 2900 | |
b4d51a55 | 2901 | if (debug_threads) |
fa593d66 | 2902 | { |
13e567af TBA |
2903 | thread_stuck = find_thread ([this] (thread_info *thread) |
2904 | { | |
2905 | return stuck_in_jump_pad (thread); | |
2906 | }); | |
fcb056a5 | 2907 | |
d86d4aaf | 2908 | if (thread_stuck != NULL) |
87ce2a04 | 2909 | debug_printf ("couldn't stabilize, LWP %ld got stuck in jump pad\n", |
d86d4aaf | 2910 | lwpid_of (thread_stuck)); |
fa593d66 PA |
2911 | } |
2912 | } | |
2913 | ||
582511be PA |
2914 | /* Convenience function that is called when the kernel reports an |
2915 | event that is not passed out to GDB. */ | |
2916 | ||
2917 | static ptid_t | |
2918 | ignore_event (struct target_waitstatus *ourstatus) | |
2919 | { | |
2920 | /* If we got an event, there may still be others, as a single | |
2921 | SIGCHLD can indicate more than one child stopped. This forces | |
2922 | another target_wait call. */ | |
2923 | async_file_mark (); | |
2924 | ||
2925 | ourstatus->kind = TARGET_WAITKIND_IGNORE; | |
2926 | return null_ptid; | |
2927 | } | |
2928 | ||
fd000fb3 TBA |
2929 | ptid_t |
2930 | linux_process_target::filter_exit_event (lwp_info *event_child, | |
2931 | target_waitstatus *ourstatus) | |
65706a29 | 2932 | { |
c12a5089 | 2933 | client_state &cs = get_client_state (); |
65706a29 PA |
2934 | struct thread_info *thread = get_lwp_thread (event_child); |
2935 | ptid_t ptid = ptid_of (thread); | |
2936 | ||
2937 | if (!last_thread_of_process_p (pid_of (thread))) | |
2938 | { | |
c12a5089 | 2939 | if (cs.report_thread_events) |
65706a29 PA |
2940 | ourstatus->kind = TARGET_WAITKIND_THREAD_EXITED; |
2941 | else | |
2942 | ourstatus->kind = TARGET_WAITKIND_IGNORE; | |
2943 | ||
2944 | delete_lwp (event_child); | |
2945 | } | |
2946 | return ptid; | |
2947 | } | |
2948 | ||
82075af2 JS |
2949 | /* Returns 1 if GDB is interested in any event_child syscalls. */ |
2950 | ||
2951 | static int | |
2952 | gdb_catching_syscalls_p (struct lwp_info *event_child) | |
2953 | { | |
2954 | struct thread_info *thread = get_lwp_thread (event_child); | |
2955 | struct process_info *proc = get_thread_process (thread); | |
2956 | ||
f27866ba | 2957 | return !proc->syscalls_to_catch.empty (); |
82075af2 JS |
2958 | } |
2959 | ||
9eedd27d TBA |
2960 | bool |
2961 | linux_process_target::gdb_catch_this_syscall (lwp_info *event_child) | |
82075af2 | 2962 | { |
4cc32bec | 2963 | int sysno; |
82075af2 JS |
2964 | struct thread_info *thread = get_lwp_thread (event_child); |
2965 | struct process_info *proc = get_thread_process (thread); | |
2966 | ||
f27866ba | 2967 | if (proc->syscalls_to_catch.empty ()) |
9eedd27d | 2968 | return false; |
82075af2 | 2969 | |
f27866ba | 2970 | if (proc->syscalls_to_catch[0] == ANY_SYSCALL) |
9eedd27d | 2971 | return true; |
82075af2 | 2972 | |
4cc32bec | 2973 | get_syscall_trapinfo (event_child, &sysno); |
f27866ba SM |
2974 | |
2975 | for (int iter : proc->syscalls_to_catch) | |
82075af2 | 2976 | if (iter == sysno) |
9eedd27d | 2977 | return true; |
82075af2 | 2978 | |
9eedd27d | 2979 | return false; |
82075af2 JS |
2980 | } |
2981 | ||
d16f3f6c TBA |
2982 | ptid_t |
2983 | linux_process_target::wait_1 (ptid_t ptid, target_waitstatus *ourstatus, | |
2984 | int target_options) | |
da6d8c04 | 2985 | { |
c12a5089 | 2986 | client_state &cs = get_client_state (); |
e5f1222d | 2987 | int w; |
fc7238bb | 2988 | struct lwp_info *event_child; |
bd99dc85 | 2989 | int options; |
bd99dc85 | 2990 | int pid; |
6bf5e0ba PA |
2991 | int step_over_finished; |
2992 | int bp_explains_trap; | |
2993 | int maybe_internal_trap; | |
2994 | int report_to_gdb; | |
219f2f23 | 2995 | int trace_event; |
c2d6af84 | 2996 | int in_step_range; |
f2faf941 | 2997 | int any_resumed; |
bd99dc85 | 2998 | |
87ce2a04 DE |
2999 | if (debug_threads) |
3000 | { | |
3001 | debug_enter (); | |
d16f3f6c | 3002 | debug_printf ("wait_1: [%s]\n", target_pid_to_str (ptid)); |
87ce2a04 DE |
3003 | } |
3004 | ||
bd99dc85 PA |
3005 | /* Translate generic target options into linux options. */ |
3006 | options = __WALL; | |
3007 | if (target_options & TARGET_WNOHANG) | |
3008 | options |= WNOHANG; | |
0d62e5e8 | 3009 | |
fa593d66 PA |
3010 | bp_explains_trap = 0; |
3011 | trace_event = 0; | |
c2d6af84 | 3012 | in_step_range = 0; |
bd99dc85 PA |
3013 | ourstatus->kind = TARGET_WAITKIND_IGNORE; |
3014 | ||
83e1b6c1 SM |
3015 | auto status_pending_p_any = [&] (thread_info *thread) |
3016 | { | |
3017 | return status_pending_p_callback (thread, minus_one_ptid); | |
3018 | }; | |
3019 | ||
a1385b7b SM |
3020 | auto not_stopped = [&] (thread_info *thread) |
3021 | { | |
3022 | return not_stopped_callback (thread, minus_one_ptid); | |
3023 | }; | |
3024 | ||
f2faf941 | 3025 | /* Find a resumed LWP, if any. */ |
83e1b6c1 | 3026 | if (find_thread (status_pending_p_any) != NULL) |
f2faf941 | 3027 | any_resumed = 1; |
a1385b7b | 3028 | else if (find_thread (not_stopped) != NULL) |
f2faf941 PA |
3029 | any_resumed = 1; |
3030 | else | |
3031 | any_resumed = 0; | |
3032 | ||
d7e15655 | 3033 | if (step_over_bkpt == null_ptid) |
d16f3f6c | 3034 | pid = wait_for_event (ptid, &w, options); |
6bf5e0ba PA |
3035 | else |
3036 | { | |
3037 | if (debug_threads) | |
87ce2a04 DE |
3038 | debug_printf ("step_over_bkpt set [%s], doing a blocking wait\n", |
3039 | target_pid_to_str (step_over_bkpt)); | |
d16f3f6c | 3040 | pid = wait_for_event (step_over_bkpt, &w, options & ~WNOHANG); |
6bf5e0ba PA |
3041 | } |
3042 | ||
f2faf941 | 3043 | if (pid == 0 || (pid == -1 && !any_resumed)) |
87ce2a04 | 3044 | { |
fa96cb38 PA |
3045 | gdb_assert (target_options & TARGET_WNOHANG); |
3046 | ||
87ce2a04 DE |
3047 | if (debug_threads) |
3048 | { | |
d16f3f6c | 3049 | debug_printf ("wait_1 ret = null_ptid, " |
fa96cb38 | 3050 | "TARGET_WAITKIND_IGNORE\n"); |
87ce2a04 DE |
3051 | debug_exit (); |
3052 | } | |
fa96cb38 PA |
3053 | |
3054 | ourstatus->kind = TARGET_WAITKIND_IGNORE; | |
87ce2a04 DE |
3055 | return null_ptid; |
3056 | } | |
fa96cb38 PA |
3057 | else if (pid == -1) |
3058 | { | |
3059 | if (debug_threads) | |
3060 | { | |
d16f3f6c | 3061 | debug_printf ("wait_1 ret = null_ptid, " |
fa96cb38 PA |
3062 | "TARGET_WAITKIND_NO_RESUMED\n"); |
3063 | debug_exit (); | |
3064 | } | |
bd99dc85 | 3065 | |
fa96cb38 PA |
3066 | ourstatus->kind = TARGET_WAITKIND_NO_RESUMED; |
3067 | return null_ptid; | |
3068 | } | |
0d62e5e8 | 3069 | |
0bfdf32f | 3070 | event_child = get_thread_lwp (current_thread); |
0d62e5e8 | 3071 | |
d16f3f6c | 3072 | /* wait_for_event only returns an exit status for the last |
fa96cb38 PA |
3073 | child of a process. Report it. */ |
3074 | if (WIFEXITED (w) || WIFSIGNALED (w)) | |
da6d8c04 | 3075 | { |
fa96cb38 | 3076 | if (WIFEXITED (w)) |
0d62e5e8 | 3077 | { |
fa96cb38 PA |
3078 | ourstatus->kind = TARGET_WAITKIND_EXITED; |
3079 | ourstatus->value.integer = WEXITSTATUS (w); | |
bd99dc85 | 3080 | |
fa96cb38 | 3081 | if (debug_threads) |
bd99dc85 | 3082 | { |
d16f3f6c | 3083 | debug_printf ("wait_1 ret = %s, exited with " |
fa96cb38 | 3084 | "retcode %d\n", |
0bfdf32f | 3085 | target_pid_to_str (ptid_of (current_thread)), |
fa96cb38 PA |
3086 | WEXITSTATUS (w)); |
3087 | debug_exit (); | |
bd99dc85 | 3088 | } |
fa96cb38 PA |
3089 | } |
3090 | else | |
3091 | { | |
3092 | ourstatus->kind = TARGET_WAITKIND_SIGNALLED; | |
3093 | ourstatus->value.sig = gdb_signal_from_host (WTERMSIG (w)); | |
5b1c542e | 3094 | |
fa96cb38 PA |
3095 | if (debug_threads) |
3096 | { | |
d16f3f6c | 3097 | debug_printf ("wait_1 ret = %s, terminated with " |
fa96cb38 | 3098 | "signal %d\n", |
0bfdf32f | 3099 | target_pid_to_str (ptid_of (current_thread)), |
fa96cb38 PA |
3100 | WTERMSIG (w)); |
3101 | debug_exit (); | |
3102 | } | |
0d62e5e8 | 3103 | } |
fa96cb38 | 3104 | |
65706a29 PA |
3105 | if (ourstatus->kind == TARGET_WAITKIND_EXITED) |
3106 | return filter_exit_event (event_child, ourstatus); | |
3107 | ||
0bfdf32f | 3108 | return ptid_of (current_thread); |
da6d8c04 DJ |
3109 | } |
3110 | ||
2d97cd35 AT |
3111 | /* If step-over executes a breakpoint instruction, in the case of a |
3112 | hardware single step it means a gdb/gdbserver breakpoint had been | |
3113 | planted on top of a permanent breakpoint, in the case of a software | |
3114 | single step it may just mean that gdbserver hit the reinsert breakpoint. | |
e7ad2f14 | 3115 | The PC has been adjusted by save_stop_reason to point at |
2d97cd35 AT |
3116 | the breakpoint address. |
3117 | So in the case of the hardware single step advance the PC manually | |
3118 | past the breakpoint and in the case of software single step advance only | |
3b9a79ef | 3119 | if it's not the single_step_breakpoint we are hitting. |
2d97cd35 AT |
3120 | This avoids that a program would keep trapping a permanent breakpoint |
3121 | forever. */ | |
d7e15655 | 3122 | if (step_over_bkpt != null_ptid |
2d97cd35 AT |
3123 | && event_child->stop_reason == TARGET_STOPPED_BY_SW_BREAKPOINT |
3124 | && (event_child->stepping | |
3b9a79ef | 3125 | || !single_step_breakpoint_inserted_here (event_child->stop_pc))) |
8090aef2 | 3126 | { |
dd373349 AT |
3127 | int increment_pc = 0; |
3128 | int breakpoint_kind = 0; | |
3129 | CORE_ADDR stop_pc = event_child->stop_pc; | |
3130 | ||
d16f3f6c TBA |
3131 | breakpoint_kind = breakpoint_kind_from_current_state (&stop_pc); |
3132 | sw_breakpoint_from_kind (breakpoint_kind, &increment_pc); | |
8090aef2 PA |
3133 | |
3134 | if (debug_threads) | |
3135 | { | |
3136 | debug_printf ("step-over for %s executed software breakpoint\n", | |
3137 | target_pid_to_str (ptid_of (current_thread))); | |
3138 | } | |
3139 | ||
3140 | if (increment_pc != 0) | |
3141 | { | |
3142 | struct regcache *regcache | |
3143 | = get_thread_regcache (current_thread, 1); | |
3144 | ||
3145 | event_child->stop_pc += increment_pc; | |
bf9ae9d8 | 3146 | low_set_pc (regcache, event_child->stop_pc); |
8090aef2 | 3147 | |
d7146cda | 3148 | if (!low_breakpoint_at (event_child->stop_pc)) |
15c66dd6 | 3149 | event_child->stop_reason = TARGET_STOPPED_BY_NO_REASON; |
8090aef2 PA |
3150 | } |
3151 | } | |
3152 | ||
6bf5e0ba PA |
3153 | /* If this event was not handled before, and is not a SIGTRAP, we |
3154 | report it. SIGILL and SIGSEGV are also treated as traps in case | |
3155 | a breakpoint is inserted at the current PC. If this target does | |
3156 | not support internal breakpoints at all, we also report the | |
3157 | SIGTRAP without further processing; it's of no concern to us. */ | |
3158 | maybe_internal_trap | |
bf9ae9d8 | 3159 | = (low_supports_breakpoints () |
6bf5e0ba PA |
3160 | && (WSTOPSIG (w) == SIGTRAP |
3161 | || ((WSTOPSIG (w) == SIGILL | |
3162 | || WSTOPSIG (w) == SIGSEGV) | |
d7146cda | 3163 | && low_breakpoint_at (event_child->stop_pc)))); |
6bf5e0ba PA |
3164 | |
3165 | if (maybe_internal_trap) | |
3166 | { | |
3167 | /* Handle anything that requires bookkeeping before deciding to | |
3168 | report the event or continue waiting. */ | |
3169 | ||
3170 | /* First check if we can explain the SIGTRAP with an internal | |
3171 | breakpoint, or if we should possibly report the event to GDB. | |
3172 | Do this before anything that may remove or insert a | |
3173 | breakpoint. */ | |
3174 | bp_explains_trap = breakpoint_inserted_here (event_child->stop_pc); | |
3175 | ||
3176 | /* We have a SIGTRAP, possibly a step-over dance has just | |
3177 | finished. If so, tweak the state machine accordingly, | |
3b9a79ef YQ |
3178 | reinsert breakpoints and delete any single-step |
3179 | breakpoints. */ | |
6bf5e0ba PA |
3180 | step_over_finished = finish_step_over (event_child); |
3181 | ||
3182 | /* Now invoke the callbacks of any internal breakpoints there. */ | |
3183 | check_breakpoints (event_child->stop_pc); | |
3184 | ||
219f2f23 PA |
3185 | /* Handle tracepoint data collecting. This may overflow the |
3186 | trace buffer, and cause a tracing stop, removing | |
3187 | breakpoints. */ | |
3188 | trace_event = handle_tracepoints (event_child); | |
3189 | ||
6bf5e0ba PA |
3190 | if (bp_explains_trap) |
3191 | { | |
6bf5e0ba | 3192 | if (debug_threads) |
87ce2a04 | 3193 | debug_printf ("Hit a gdbserver breakpoint.\n"); |
6bf5e0ba PA |
3194 | } |
3195 | } | |
3196 | else | |
3197 | { | |
3198 | /* We have some other signal, possibly a step-over dance was in | |
3199 | progress, and it should be cancelled too. */ | |
3200 | step_over_finished = finish_step_over (event_child); | |
fa593d66 PA |
3201 | } |
3202 | ||
3203 | /* We have all the data we need. Either report the event to GDB, or | |
3204 | resume threads and keep waiting for more. */ | |
3205 | ||
3206 | /* If we're collecting a fast tracepoint, finish the collection and | |
3207 | move out of the jump pad before delivering a signal. See | |
3208 | linux_stabilize_threads. */ | |
3209 | ||
3210 | if (WIFSTOPPED (w) | |
3211 | && WSTOPSIG (w) != SIGTRAP | |
3212 | && supports_fast_tracepoints () | |
58b4daa5 | 3213 | && agent_loaded_p ()) |
fa593d66 PA |
3214 | { |
3215 | if (debug_threads) | |
87ce2a04 DE |
3216 | debug_printf ("Got signal %d for LWP %ld. Check if we need " |
3217 | "to defer or adjust it.\n", | |
0bfdf32f | 3218 | WSTOPSIG (w), lwpid_of (current_thread)); |
fa593d66 PA |
3219 | |
3220 | /* Allow debugging the jump pad itself. */ | |
0bfdf32f | 3221 | if (current_thread->last_resume_kind != resume_step |
fa593d66 PA |
3222 | && maybe_move_out_of_jump_pad (event_child, &w)) |
3223 | { | |
3224 | enqueue_one_deferred_signal (event_child, &w); | |
3225 | ||
3226 | if (debug_threads) | |
87ce2a04 | 3227 | debug_printf ("Signal %d for LWP %ld deferred (in jump pad)\n", |
0bfdf32f | 3228 | WSTOPSIG (w), lwpid_of (current_thread)); |
fa593d66 | 3229 | |
df95181f | 3230 | resume_one_lwp (event_child, 0, 0, NULL); |
582511be | 3231 | |
edeeb602 YQ |
3232 | if (debug_threads) |
3233 | debug_exit (); | |
582511be | 3234 | return ignore_event (ourstatus); |
fa593d66 PA |
3235 | } |
3236 | } | |
219f2f23 | 3237 | |
229d26fc SM |
3238 | if (event_child->collecting_fast_tracepoint |
3239 | != fast_tpoint_collect_result::not_collecting) | |
fa593d66 PA |
3240 | { |
3241 | if (debug_threads) | |
87ce2a04 DE |
3242 | debug_printf ("LWP %ld was trying to move out of the jump pad (%d). " |
3243 | "Check if we're already there.\n", | |
0bfdf32f | 3244 | lwpid_of (current_thread), |
229d26fc | 3245 | (int) event_child->collecting_fast_tracepoint); |
fa593d66 PA |
3246 | |
3247 | trace_event = 1; | |
3248 | ||
3249 | event_child->collecting_fast_tracepoint | |
3250 | = linux_fast_tracepoint_collecting (event_child, NULL); | |
3251 | ||
229d26fc SM |
3252 | if (event_child->collecting_fast_tracepoint |
3253 | != fast_tpoint_collect_result::before_insn) | |
fa593d66 PA |
3254 | { |
3255 | /* No longer need this breakpoint. */ | |
3256 | if (event_child->exit_jump_pad_bkpt != NULL) | |
3257 | { | |
3258 | if (debug_threads) | |
87ce2a04 DE |
3259 | debug_printf ("No longer need exit-jump-pad bkpt; removing it." |
3260 | "stopping all threads momentarily.\n"); | |
fa593d66 PA |
3261 | |
3262 | /* Other running threads could hit this breakpoint. | |
3263 | We don't handle moribund locations like GDB does, | |
3264 | instead we always pause all threads when removing | |
3265 | breakpoints, so that any step-over or | |
3266 | decr_pc_after_break adjustment is always taken | |
3267 | care of while the breakpoint is still | |
3268 | inserted. */ | |
3269 | stop_all_lwps (1, event_child); | |
fa593d66 PA |
3270 | |
3271 | delete_breakpoint (event_child->exit_jump_pad_bkpt); | |
3272 | event_child->exit_jump_pad_bkpt = NULL; | |
3273 | ||
3274 | unstop_all_lwps (1, event_child); | |
3275 | ||
3276 | gdb_assert (event_child->suspended >= 0); | |
3277 | } | |
3278 | } | |
3279 | ||
229d26fc SM |
3280 | if (event_child->collecting_fast_tracepoint |
3281 | == fast_tpoint_collect_result::not_collecting) | |
fa593d66 PA |
3282 | { |
3283 | if (debug_threads) | |
87ce2a04 DE |
3284 | debug_printf ("fast tracepoint finished " |
3285 | "collecting successfully.\n"); | |
fa593d66 PA |
3286 | |
3287 | /* We may have a deferred signal to report. */ | |
3288 | if (dequeue_one_deferred_signal (event_child, &w)) | |
3289 | { | |
3290 | if (debug_threads) | |
87ce2a04 | 3291 | debug_printf ("dequeued one signal.\n"); |
fa593d66 | 3292 | } |
3c11dd79 | 3293 | else |
fa593d66 | 3294 | { |
3c11dd79 | 3295 | if (debug_threads) |
87ce2a04 | 3296 | debug_printf ("no deferred signals.\n"); |
fa593d66 PA |
3297 | |
3298 | if (stabilizing_threads) | |
3299 | { | |
3300 | ourstatus->kind = TARGET_WAITKIND_STOPPED; | |
a493e3e2 | 3301 | ourstatus->value.sig = GDB_SIGNAL_0; |
87ce2a04 DE |
3302 | |
3303 | if (debug_threads) | |
3304 | { | |
d16f3f6c | 3305 | debug_printf ("wait_1 ret = %s, stopped " |
87ce2a04 | 3306 | "while stabilizing threads\n", |
0bfdf32f | 3307 | target_pid_to_str (ptid_of (current_thread))); |
87ce2a04 DE |
3308 | debug_exit (); |
3309 | } | |
3310 | ||
0bfdf32f | 3311 | return ptid_of (current_thread); |
fa593d66 PA |
3312 | } |
3313 | } | |
3314 | } | |
6bf5e0ba PA |
3315 | } |
3316 | ||
e471f25b PA |
3317 | /* Check whether GDB would be interested in this event. */ |
3318 | ||
82075af2 JS |
3319 | /* Check if GDB is interested in this syscall. */ |
3320 | if (WIFSTOPPED (w) | |
3321 | && WSTOPSIG (w) == SYSCALL_SIGTRAP | |
9eedd27d | 3322 | && !gdb_catch_this_syscall (event_child)) |
82075af2 JS |
3323 | { |
3324 | if (debug_threads) | |
3325 | { | |
3326 | debug_printf ("Ignored syscall for LWP %ld.\n", | |
3327 | lwpid_of (current_thread)); | |
3328 | } | |
3329 | ||
df95181f | 3330 | resume_one_lwp (event_child, event_child->stepping, 0, NULL); |
edeeb602 YQ |
3331 | |
3332 | if (debug_threads) | |
3333 | debug_exit (); | |
82075af2 JS |
3334 | return ignore_event (ourstatus); |
3335 | } | |
3336 | ||
e471f25b PA |
3337 | /* If GDB is not interested in this signal, don't stop other |
3338 | threads, and don't report it to GDB. Just resume the inferior | |
3339 | right away. We do this for threading-related signals as well as | |
3340 | any that GDB specifically requested we ignore. But never ignore | |
3341 | SIGSTOP if we sent it ourselves, and do not ignore signals when | |
3342 | stepping - they may require special handling to skip the signal | |
c9587f88 AT |
3343 | handler. Also never ignore signals that could be caused by a |
3344 | breakpoint. */ | |
e471f25b | 3345 | if (WIFSTOPPED (w) |
0bfdf32f | 3346 | && current_thread->last_resume_kind != resume_step |
e471f25b | 3347 | && ( |
1a981360 | 3348 | #if defined (USE_THREAD_DB) && !defined (__ANDROID__) |
fe978cb0 | 3349 | (current_process ()->priv->thread_db != NULL |
e471f25b PA |
3350 | && (WSTOPSIG (w) == __SIGRTMIN |
3351 | || WSTOPSIG (w) == __SIGRTMIN + 1)) | |
3352 | || | |
3353 | #endif | |
c12a5089 | 3354 | (cs.pass_signals[gdb_signal_from_host (WSTOPSIG (w))] |
e471f25b | 3355 | && !(WSTOPSIG (w) == SIGSTOP |
c9587f88 AT |
3356 | && current_thread->last_resume_kind == resume_stop) |
3357 | && !linux_wstatus_maybe_breakpoint (w)))) | |
e471f25b PA |
3358 | { |
3359 | siginfo_t info, *info_p; | |
3360 | ||
3361 | if (debug_threads) | |
87ce2a04 | 3362 | debug_printf ("Ignored signal %d for LWP %ld.\n", |
0bfdf32f | 3363 | WSTOPSIG (w), lwpid_of (current_thread)); |
e471f25b | 3364 | |
0bfdf32f | 3365 | if (ptrace (PTRACE_GETSIGINFO, lwpid_of (current_thread), |
b8e1b30e | 3366 | (PTRACE_TYPE_ARG3) 0, &info) == 0) |
e471f25b PA |
3367 | info_p = &info; |
3368 | else | |
3369 | info_p = NULL; | |
863d01bd PA |
3370 | |
3371 | if (step_over_finished) | |
3372 | { | |
3373 | /* We cancelled this thread's step-over above. We still | |
3374 | need to unsuspend all other LWPs, and set them back | |
3375 | running again while the signal handler runs. */ | |
3376 | unsuspend_all_lwps (event_child); | |
3377 | ||
3378 | /* Enqueue the pending signal info so that proceed_all_lwps | |
3379 | doesn't lose it. */ | |
3380 | enqueue_pending_signal (event_child, WSTOPSIG (w), info_p); | |
3381 | ||
3382 | proceed_all_lwps (); | |
3383 | } | |
3384 | else | |
3385 | { | |
df95181f TBA |
3386 | resume_one_lwp (event_child, event_child->stepping, |
3387 | WSTOPSIG (w), info_p); | |
863d01bd | 3388 | } |
edeeb602 YQ |
3389 | |
3390 | if (debug_threads) | |
3391 | debug_exit (); | |
3392 | ||
582511be | 3393 | return ignore_event (ourstatus); |
e471f25b PA |
3394 | } |
3395 | ||
c2d6af84 PA |
3396 | /* Note that all addresses are always "out of the step range" when |
3397 | there's no range to begin with. */ | |
3398 | in_step_range = lwp_in_step_range (event_child); | |
3399 | ||
3400 | /* If GDB wanted this thread to single step, and the thread is out | |
3401 | of the step range, we always want to report the SIGTRAP, and let | |
3402 | GDB handle it. Watchpoints should always be reported. So should | |
3403 | signals we can't explain. A SIGTRAP we can't explain could be a | |
3404 | GDB breakpoint --- we may or not support Z0 breakpoints. If we | |
3405 | do, we're be able to handle GDB breakpoints on top of internal | |
3406 | breakpoints, by handling the internal breakpoint and still | |
3407 | reporting the event to GDB. If we don't, we're out of luck, GDB | |
863d01bd PA |
3408 | won't see the breakpoint hit. If we see a single-step event but |
3409 | the thread should be continuing, don't pass the trap to gdb. | |
3410 | That indicates that we had previously finished a single-step but | |
3411 | left the single-step pending -- see | |
3412 | complete_ongoing_step_over. */ | |
6bf5e0ba | 3413 | report_to_gdb = (!maybe_internal_trap |
0bfdf32f | 3414 | || (current_thread->last_resume_kind == resume_step |
c2d6af84 | 3415 | && !in_step_range) |
15c66dd6 | 3416 | || event_child->stop_reason == TARGET_STOPPED_BY_WATCHPOINT |
863d01bd PA |
3417 | || (!in_step_range |
3418 | && !bp_explains_trap | |
3419 | && !trace_event | |
3420 | && !step_over_finished | |
3421 | && !(current_thread->last_resume_kind == resume_continue | |
3422 | && event_child->stop_reason == TARGET_STOPPED_BY_SINGLE_STEP)) | |
9f3a5c85 | 3423 | || (gdb_breakpoint_here (event_child->stop_pc) |
d3ce09f5 | 3424 | && gdb_condition_true_at_breakpoint (event_child->stop_pc) |
de0d863e | 3425 | && gdb_no_commands_at_breakpoint (event_child->stop_pc)) |
00db26fa | 3426 | || event_child->waitstatus.kind != TARGET_WAITKIND_IGNORE); |
d3ce09f5 SS |
3427 | |
3428 | run_breakpoint_commands (event_child->stop_pc); | |
6bf5e0ba PA |
3429 | |
3430 | /* We found no reason GDB would want us to stop. We either hit one | |
3431 | of our own breakpoints, or finished an internal step GDB | |
3432 | shouldn't know about. */ | |
3433 | if (!report_to_gdb) | |
3434 | { | |
3435 | if (debug_threads) | |
3436 | { | |
3437 | if (bp_explains_trap) | |
87ce2a04 | 3438 | debug_printf ("Hit a gdbserver breakpoint.\n"); |
6bf5e0ba | 3439 | if (step_over_finished) |
87ce2a04 | 3440 | debug_printf ("Step-over finished.\n"); |
219f2f23 | 3441 | if (trace_event) |
87ce2a04 | 3442 | debug_printf ("Tracepoint event.\n"); |
c2d6af84 | 3443 | if (lwp_in_step_range (event_child)) |
87ce2a04 DE |
3444 | debug_printf ("Range stepping pc 0x%s [0x%s, 0x%s).\n", |
3445 | paddress (event_child->stop_pc), | |
3446 | paddress (event_child->step_range_start), | |
3447 | paddress (event_child->step_range_end)); | |
6bf5e0ba PA |
3448 | } |
3449 | ||
3450 | /* We're not reporting this breakpoint to GDB, so apply the | |
3451 | decr_pc_after_break adjustment to the inferior's regcache | |
3452 | ourselves. */ | |
3453 | ||
bf9ae9d8 | 3454 | if (low_supports_breakpoints ()) |
6bf5e0ba PA |
3455 | { |
3456 | struct regcache *regcache | |
0bfdf32f | 3457 | = get_thread_regcache (current_thread, 1); |
bf9ae9d8 | 3458 | low_set_pc (regcache, event_child->stop_pc); |
6bf5e0ba PA |
3459 | } |
3460 | ||
7984d532 | 3461 | if (step_over_finished) |
e3652c84 YQ |
3462 | { |
3463 | /* If we have finished stepping over a breakpoint, we've | |
3464 | stopped and suspended all LWPs momentarily except the | |
3465 | stepping one. This is where we resume them all again. | |
3466 | We're going to keep waiting, so use proceed, which | |
3467 | handles stepping over the next breakpoint. */ | |
3468 | unsuspend_all_lwps (event_child); | |
3469 | } | |
3470 | else | |
3471 | { | |
3472 | /* Remove the single-step breakpoints if any. Note that | |
3473 | there isn't single-step breakpoint if we finished stepping | |
3474 | over. */ | |
7582c77c | 3475 | if (supports_software_single_step () |
e3652c84 YQ |
3476 | && has_single_step_breakpoints (current_thread)) |
3477 | { | |
3478 | stop_all_lwps (0, event_child); | |
3479 | delete_single_step_breakpoints (current_thread); | |
3480 | unstop_all_lwps (0, event_child); | |
3481 | } | |
3482 | } | |
7984d532 | 3483 | |
e3652c84 YQ |
3484 | if (debug_threads) |
3485 | debug_printf ("proceeding all threads.\n"); | |
6bf5e0ba | 3486 | proceed_all_lwps (); |
edeeb602 YQ |
3487 | |
3488 | if (debug_threads) | |
3489 | debug_exit (); | |
3490 | ||
582511be | 3491 | return ignore_event (ourstatus); |
6bf5e0ba PA |
3492 | } |
3493 | ||
3494 | if (debug_threads) | |
3495 | { | |
00db26fa | 3496 | if (event_child->waitstatus.kind != TARGET_WAITKIND_IGNORE) |
ad071a30 | 3497 | { |
23fdd69e SM |
3498 | std::string str |
3499 | = target_waitstatus_to_string (&event_child->waitstatus); | |
ad071a30 | 3500 | |
ad071a30 | 3501 | debug_printf ("LWP %ld: extended event with waitstatus %s\n", |
23fdd69e | 3502 | lwpid_of (get_lwp_thread (event_child)), str.c_str ()); |
ad071a30 | 3503 | } |
0bfdf32f | 3504 | if (current_thread->last_resume_kind == resume_step) |
c2d6af84 PA |
3505 | { |
3506 | if (event_child->step_range_start == event_child->step_range_end) | |
87ce2a04 | 3507 | debug_printf ("GDB wanted to single-step, reporting event.\n"); |
c2d6af84 | 3508 | else if (!lwp_in_step_range (event_child)) |
87ce2a04 | 3509 | debug_printf ("Out of step range, reporting event.\n"); |
c2d6af84 | 3510 | } |
15c66dd6 | 3511 | if (event_child->stop_reason == TARGET_STOPPED_BY_WATCHPOINT) |
87ce2a04 | 3512 | debug_printf ("Stopped by watchpoint.\n"); |
582511be | 3513 | else if (gdb_breakpoint_here (event_child->stop_pc)) |
87ce2a04 | 3514 | debug_printf ("Stopped by GDB breakpoint.\n"); |
6bf5e0ba | 3515 | if (debug_threads) |
87ce2a04 | 3516 | debug_printf ("Hit a non-gdbserver trap event.\n"); |
6bf5e0ba PA |
3517 | } |
3518 | ||
3519 | /* Alright, we're going to report a stop. */ | |
3520 | ||
3b9a79ef | 3521 | /* Remove single-step breakpoints. */ |
7582c77c | 3522 | if (supports_software_single_step ()) |
8901d193 | 3523 | { |
3b9a79ef | 3524 | /* Remove single-step breakpoints or not. It it is true, stop all |
8901d193 YQ |
3525 | lwps, so that other threads won't hit the breakpoint in the |
3526 | staled memory. */ | |
3b9a79ef | 3527 | int remove_single_step_breakpoints_p = 0; |
8901d193 YQ |
3528 | |
3529 | if (non_stop) | |
3530 | { | |
3b9a79ef YQ |
3531 | remove_single_step_breakpoints_p |
3532 | = has_single_step_breakpoints (current_thread); | |
8901d193 YQ |
3533 | } |
3534 | else | |
3535 | { | |
3536 | /* In all-stop, a stop reply cancels all previous resume | |
3b9a79ef | 3537 | requests. Delete all single-step breakpoints. */ |
8901d193 | 3538 | |
9c80ecd6 SM |
3539 | find_thread ([&] (thread_info *thread) { |
3540 | if (has_single_step_breakpoints (thread)) | |
3541 | { | |
3542 | remove_single_step_breakpoints_p = 1; | |
3543 | return true; | |
3544 | } | |
8901d193 | 3545 | |
9c80ecd6 SM |
3546 | return false; |
3547 | }); | |
8901d193 YQ |
3548 | } |
3549 | ||
3b9a79ef | 3550 | if (remove_single_step_breakpoints_p) |
8901d193 | 3551 | { |
3b9a79ef | 3552 | /* If we remove single-step breakpoints from memory, stop all lwps, |
8901d193 YQ |
3553 | so that other threads won't hit the breakpoint in the staled |
3554 | memory. */ | |
3555 | stop_all_lwps (0, event_child); | |
3556 | ||
3557 | if (non_stop) | |
3558 | { | |
3b9a79ef YQ |
3559 | gdb_assert (has_single_step_breakpoints (current_thread)); |
3560 | delete_single_step_breakpoints (current_thread); | |
8901d193 YQ |
3561 | } |
3562 | else | |
3563 | { | |
9c80ecd6 SM |
3564 | for_each_thread ([] (thread_info *thread){ |
3565 | if (has_single_step_breakpoints (thread)) | |
3566 | delete_single_step_breakpoints (thread); | |
3567 | }); | |
8901d193 YQ |
3568 | } |
3569 | ||
3570 | unstop_all_lwps (0, event_child); | |
3571 | } | |
3572 | } | |
3573 | ||
582511be | 3574 | if (!stabilizing_threads) |
6bf5e0ba PA |
3575 | { |
3576 | /* In all-stop, stop all threads. */ | |
582511be PA |
3577 | if (!non_stop) |
3578 | stop_all_lwps (0, NULL); | |
6bf5e0ba | 3579 | |
c03e6ccc | 3580 | if (step_over_finished) |
582511be PA |
3581 | { |
3582 | if (!non_stop) | |
3583 | { | |
3584 | /* If we were doing a step-over, all other threads but | |
3585 | the stepping one had been paused in start_step_over, | |
3586 | with their suspend counts incremented. We don't want | |
3587 | to do a full unstop/unpause, because we're in | |
3588 | all-stop mode (so we want threads stopped), but we | |
3589 | still need to unsuspend the other threads, to | |
3590 | decrement their `suspended' count back. */ | |
3591 | unsuspend_all_lwps (event_child); | |
3592 | } | |
3593 | else | |
3594 | { | |
3595 | /* If we just finished a step-over, then all threads had | |
3596 | been momentarily paused. In all-stop, that's fine, | |
3597 | we want threads stopped by now anyway. In non-stop, | |
3598 | we need to re-resume threads that GDB wanted to be | |
3599 | running. */ | |
3600 | unstop_all_lwps (1, event_child); | |
3601 | } | |
3602 | } | |
c03e6ccc | 3603 | |
3aa5cfa0 AT |
3604 | /* If we're not waiting for a specific LWP, choose an event LWP |
3605 | from among those that have had events. Giving equal priority | |
3606 | to all LWPs that have had events helps prevent | |
3607 | starvation. */ | |
d7e15655 | 3608 | if (ptid == minus_one_ptid) |
3aa5cfa0 AT |
3609 | { |
3610 | event_child->status_pending_p = 1; | |
3611 | event_child->status_pending = w; | |
3612 | ||
3613 | select_event_lwp (&event_child); | |
3614 | ||
3615 | /* current_thread and event_child must stay in sync. */ | |
3616 | current_thread = get_lwp_thread (event_child); | |
3617 | ||
3618 | event_child->status_pending_p = 0; | |
3619 | w = event_child->status_pending; | |
3620 | } | |
3621 | ||
3622 | ||
fa593d66 | 3623 | /* Stabilize threads (move out of jump pads). */ |
582511be | 3624 | if (!non_stop) |
5c9eb2f2 | 3625 | target_stabilize_threads (); |
6bf5e0ba PA |
3626 | } |
3627 | else | |
3628 | { | |
3629 | /* If we just finished a step-over, then all threads had been | |
3630 | momentarily paused. In all-stop, that's fine, we want | |
3631 | threads stopped by now anyway. In non-stop, we need to | |
3632 | re-resume threads that GDB wanted to be running. */ | |
3633 | if (step_over_finished) | |
7984d532 | 3634 | unstop_all_lwps (1, event_child); |
6bf5e0ba PA |
3635 | } |
3636 | ||
00db26fa | 3637 | if (event_child->waitstatus.kind != TARGET_WAITKIND_IGNORE) |
de0d863e | 3638 | { |
00db26fa PA |
3639 | /* If the reported event is an exit, fork, vfork or exec, let |
3640 | GDB know. */ | |
5a04c4cf PA |
3641 | |
3642 | /* Break the unreported fork relationship chain. */ | |
3643 | if (event_child->waitstatus.kind == TARGET_WAITKIND_FORKED | |
3644 | || event_child->waitstatus.kind == TARGET_WAITKIND_VFORKED) | |
3645 | { | |
3646 | event_child->fork_relative->fork_relative = NULL; | |
3647 | event_child->fork_relative = NULL; | |
3648 | } | |
3649 | ||
00db26fa | 3650 | *ourstatus = event_child->waitstatus; |
de0d863e DB |
3651 | /* Clear the event lwp's waitstatus since we handled it already. */ |
3652 | event_child->waitstatus.kind = TARGET_WAITKIND_IGNORE; | |
3653 | } | |
3654 | else | |
3655 | ourstatus->kind = TARGET_WAITKIND_STOPPED; | |
5b1c542e | 3656 | |
582511be | 3657 | /* Now that we've selected our final event LWP, un-adjust its PC if |
3e572f71 PA |
3658 | it was a software breakpoint, and the client doesn't know we can |
3659 | adjust the breakpoint ourselves. */ | |
3660 | if (event_child->stop_reason == TARGET_STOPPED_BY_SW_BREAKPOINT | |
c12a5089 | 3661 | && !cs.swbreak_feature) |
582511be | 3662 | { |
d4807ea2 | 3663 | int decr_pc = low_decr_pc_after_break (); |
582511be PA |
3664 | |
3665 | if (decr_pc != 0) | |
3666 | { | |
3667 | struct regcache *regcache | |
3668 | = get_thread_regcache (current_thread, 1); | |
bf9ae9d8 | 3669 | low_set_pc (regcache, event_child->stop_pc + decr_pc); |
582511be PA |
3670 | } |
3671 | } | |
3672 | ||
82075af2 JS |
3673 | if (WSTOPSIG (w) == SYSCALL_SIGTRAP) |
3674 | { | |
82075af2 | 3675 | get_syscall_trapinfo (event_child, |
4cc32bec | 3676 | &ourstatus->value.syscall_number); |
82075af2 JS |
3677 | ourstatus->kind = event_child->syscall_state; |
3678 | } | |
3679 | else if (current_thread->last_resume_kind == resume_stop | |
3680 | && WSTOPSIG (w) == SIGSTOP) | |
bd99dc85 PA |
3681 | { |
3682 | /* A thread that has been requested to stop by GDB with vCont;t, | |
3683 | and it stopped cleanly, so report as SIG0. The use of | |
3684 | SIGSTOP is an implementation detail. */ | |
a493e3e2 | 3685 | ourstatus->value.sig = GDB_SIGNAL_0; |
bd99dc85 | 3686 | } |
0bfdf32f | 3687 | else if (current_thread->last_resume_kind == resume_stop |
8336d594 | 3688 | && WSTOPSIG (w) != SIGSTOP) |
bd99dc85 PA |
3689 | { |
3690 | /* A thread that has been requested to stop by GDB with vCont;t, | |
d50171e4 | 3691 | but, it stopped for other reasons. */ |
2ea28649 | 3692 | ourstatus->value.sig = gdb_signal_from_host (WSTOPSIG (w)); |
bd99dc85 | 3693 | } |
de0d863e | 3694 | else if (ourstatus->kind == TARGET_WAITKIND_STOPPED) |
bd99dc85 | 3695 | { |
2ea28649 | 3696 | ourstatus->value.sig = gdb_signal_from_host (WSTOPSIG (w)); |
bd99dc85 PA |
3697 | } |
3698 | ||
d7e15655 | 3699 | gdb_assert (step_over_bkpt == null_ptid); |
d50171e4 | 3700 | |
bd99dc85 | 3701 | if (debug_threads) |
87ce2a04 | 3702 | { |
d16f3f6c | 3703 | debug_printf ("wait_1 ret = %s, %d, %d\n", |
0bfdf32f | 3704 | target_pid_to_str (ptid_of (current_thread)), |
87ce2a04 DE |
3705 | ourstatus->kind, ourstatus->value.sig); |
3706 | debug_exit (); | |
3707 | } | |
bd99dc85 | 3708 | |
65706a29 PA |
3709 | if (ourstatus->kind == TARGET_WAITKIND_EXITED) |
3710 | return filter_exit_event (event_child, ourstatus); | |
3711 | ||
0bfdf32f | 3712 | return ptid_of (current_thread); |
bd99dc85 PA |
3713 | } |
3714 | ||
3715 | /* Get rid of any pending event in the pipe. */ | |
3716 | static void | |
3717 | async_file_flush (void) | |
3718 | { | |
3719 | int ret; | |
3720 | char buf; | |
3721 | ||
3722 | do | |
3723 | ret = read (linux_event_pipe[0], &buf, 1); | |
3724 | while (ret >= 0 || (ret == -1 && errno == EINTR)); | |
3725 | } | |
3726 | ||
3727 | /* Put something in the pipe, so the event loop wakes up. */ | |
3728 | static void | |
3729 | async_file_mark (void) | |
3730 | { | |
3731 | int ret; | |
3732 | ||
3733 | async_file_flush (); | |
3734 | ||
3735 | do | |
3736 | ret = write (linux_event_pipe[1], "+", 1); | |
3737 | while (ret == 0 || (ret == -1 && errno == EINTR)); | |
3738 | ||
3739 | /* Ignore EAGAIN. If the pipe is full, the event loop will already | |
3740 | be awakened anyway. */ | |
3741 | } | |
3742 | ||
6532e7e3 TBA |
3743 | ptid_t |
3744 | linux_process_target::wait (ptid_t ptid, | |
3745 | target_waitstatus *ourstatus, | |
3746 | int target_options) | |
bd99dc85 | 3747 | { |
95954743 | 3748 | ptid_t event_ptid; |
bd99dc85 | 3749 | |
bd99dc85 PA |
3750 | /* Flush the async file first. */ |
3751 | if (target_is_async_p ()) | |
3752 | async_file_flush (); | |
3753 | ||
582511be PA |
3754 | do |
3755 | { | |
d16f3f6c | 3756 | event_ptid = wait_1 (ptid, ourstatus, target_options); |
582511be PA |
3757 | } |
3758 | while ((target_options & TARGET_WNOHANG) == 0 | |
d7e15655 | 3759 | && event_ptid == null_ptid |
582511be | 3760 | && ourstatus->kind == TARGET_WAITKIND_IGNORE); |
bd99dc85 PA |
3761 | |
3762 | /* If at least one stop was reported, there may be more. A single | |
3763 | SIGCHLD can signal more than one child stop. */ | |
3764 | if (target_is_async_p () | |
3765 | && (target_options & TARGET_WNOHANG) != 0 | |
d7e15655 | 3766 | && event_ptid != null_ptid) |
bd99dc85 PA |
3767 | async_file_mark (); |
3768 | ||
3769 | return event_ptid; | |
da6d8c04 DJ |
3770 | } |
3771 | ||
c5f62d5f | 3772 | /* Send a signal to an LWP. */ |
fd500816 DJ |
3773 | |
3774 | static int | |
a1928bad | 3775 | kill_lwp (unsigned long lwpid, int signo) |
fd500816 | 3776 | { |
4a6ed09b | 3777 | int ret; |
fd500816 | 3778 | |
4a6ed09b PA |
3779 | errno = 0; |
3780 | ret = syscall (__NR_tkill, lwpid, signo); | |
3781 | if (errno == ENOSYS) | |
3782 | { | |
3783 | /* If tkill fails, then we are not using nptl threads, a | |
3784 | configuration we no longer support. */ | |
3785 | perror_with_name (("tkill")); | |
3786 | } | |
3787 | return ret; | |
fd500816 DJ |
3788 | } |
3789 | ||
964e4306 PA |
3790 | void |
3791 | linux_stop_lwp (struct lwp_info *lwp) | |
3792 | { | |
3793 | send_sigstop (lwp); | |
3794 | } | |
3795 | ||
0d62e5e8 | 3796 | static void |
02fc4de7 | 3797 | send_sigstop (struct lwp_info *lwp) |
0d62e5e8 | 3798 | { |
bd99dc85 | 3799 | int pid; |
0d62e5e8 | 3800 | |
d86d4aaf | 3801 | pid = lwpid_of (get_lwp_thread (lwp)); |
bd99dc85 | 3802 | |
0d62e5e8 DJ |
3803 | /* If we already have a pending stop signal for this process, don't |
3804 | send another. */ | |
54a0b537 | 3805 | if (lwp->stop_expected) |
0d62e5e8 | 3806 | { |
ae13219e | 3807 | if (debug_threads) |
87ce2a04 | 3808 | debug_printf ("Have pending sigstop for lwp %d\n", pid); |
ae13219e | 3809 | |
0d62e5e8 DJ |
3810 | return; |
3811 | } | |
3812 | ||
3813 | if (debug_threads) | |
87ce2a04 | 3814 | debug_printf ("Sending sigstop to lwp %d\n", pid); |
0d62e5e8 | 3815 | |
d50171e4 | 3816 | lwp->stop_expected = 1; |
bd99dc85 | 3817 | kill_lwp (pid, SIGSTOP); |
0d62e5e8 DJ |
3818 | } |
3819 | ||
df3e4dbe SM |
3820 | static void |
3821 | send_sigstop (thread_info *thread, lwp_info *except) | |
02fc4de7 | 3822 | { |
d86d4aaf | 3823 | struct lwp_info *lwp = get_thread_lwp (thread); |
02fc4de7 | 3824 | |
7984d532 PA |
3825 | /* Ignore EXCEPT. */ |
3826 | if (lwp == except) | |
df3e4dbe | 3827 | return; |
7984d532 | 3828 | |
02fc4de7 | 3829 | if (lwp->stopped) |
df3e4dbe | 3830 | return; |
02fc4de7 PA |
3831 | |
3832 | send_sigstop (lwp); | |
7984d532 PA |
3833 | } |
3834 | ||
3835 | /* Increment the suspend count of an LWP, and stop it, if not stopped | |
3836 | yet. */ | |
df3e4dbe SM |
3837 | static void |
3838 | suspend_and_send_sigstop (thread_info *thread, lwp_info *except) | |
7984d532 | 3839 | { |
d86d4aaf | 3840 | struct lwp_info *lwp = get_thread_lwp (thread); |
7984d532 PA |
3841 | |
3842 | /* Ignore EXCEPT. */ | |
3843 | if (lwp == except) | |
df3e4dbe | 3844 | return; |
7984d532 | 3845 | |
863d01bd | 3846 | lwp_suspended_inc (lwp); |
7984d532 | 3847 | |
df3e4dbe | 3848 | send_sigstop (thread, except); |
02fc4de7 PA |
3849 | } |
3850 | ||
95954743 PA |
3851 | static void |
3852 | mark_lwp_dead (struct lwp_info *lwp, int wstat) | |
3853 | { | |
95954743 PA |
3854 | /* Store the exit status for later. */ |
3855 | lwp->status_pending_p = 1; | |
3856 | lwp->status_pending = wstat; | |
3857 | ||
00db26fa PA |
3858 | /* Store in waitstatus as well, as there's nothing else to process |
3859 | for this event. */ | |
3860 | if (WIFEXITED (wstat)) | |
3861 | { | |
3862 | lwp->waitstatus.kind = TARGET_WAITKIND_EXITED; | |
3863 | lwp->waitstatus.value.integer = WEXITSTATUS (wstat); | |
3864 | } | |
3865 | else if (WIFSIGNALED (wstat)) | |
3866 | { | |
3867 | lwp->waitstatus.kind = TARGET_WAITKIND_SIGNALLED; | |
3868 | lwp->waitstatus.value.sig = gdb_signal_from_host (WTERMSIG (wstat)); | |
3869 | } | |
3870 | ||
95954743 PA |
3871 | /* Prevent trying to stop it. */ |
3872 | lwp->stopped = 1; | |
3873 | ||
3874 | /* No further stops are expected from a dead lwp. */ | |
3875 | lwp->stop_expected = 0; | |
3876 | } | |
3877 | ||
00db26fa PA |
3878 | /* Return true if LWP has exited already, and has a pending exit event |
3879 | to report to GDB. */ | |
3880 | ||
3881 | static int | |
3882 | lwp_is_marked_dead (struct lwp_info *lwp) | |
3883 | { | |
3884 | return (lwp->status_pending_p | |
3885 | && (WIFEXITED (lwp->status_pending) | |
3886 | || WIFSIGNALED (lwp->status_pending))); | |
3887 | } | |
3888 | ||
d16f3f6c TBA |
3889 | void |
3890 | linux_process_target::wait_for_sigstop () | |
0d62e5e8 | 3891 | { |
0bfdf32f | 3892 | struct thread_info *saved_thread; |
95954743 | 3893 | ptid_t saved_tid; |
fa96cb38 PA |
3894 | int wstat; |
3895 | int ret; | |
0d62e5e8 | 3896 | |
0bfdf32f GB |
3897 | saved_thread = current_thread; |
3898 | if (saved_thread != NULL) | |
9c80ecd6 | 3899 | saved_tid = saved_thread->id; |
bd99dc85 | 3900 | else |
95954743 | 3901 | saved_tid = null_ptid; /* avoid bogus unused warning */ |
bd99dc85 | 3902 | |
d50171e4 | 3903 | if (debug_threads) |
fa96cb38 | 3904 | debug_printf ("wait_for_sigstop: pulling events\n"); |
d50171e4 | 3905 | |
fa96cb38 PA |
3906 | /* Passing NULL_PTID as filter indicates we want all events to be |
3907 | left pending. Eventually this returns when there are no | |
3908 | unwaited-for children left. */ | |
d16f3f6c | 3909 | ret = wait_for_event_filtered (minus_one_ptid, null_ptid, &wstat, __WALL); |
fa96cb38 | 3910 | gdb_assert (ret == -1); |
0d62e5e8 | 3911 | |
13d3d99b | 3912 | if (saved_thread == NULL || mythread_alive (saved_tid)) |
0bfdf32f | 3913 | current_thread = saved_thread; |
0d62e5e8 DJ |
3914 | else |
3915 | { | |
3916 | if (debug_threads) | |
87ce2a04 | 3917 | debug_printf ("Previously current thread died.\n"); |
0d62e5e8 | 3918 | |
f0db101d PA |
3919 | /* We can't change the current inferior behind GDB's back, |
3920 | otherwise, a subsequent command may apply to the wrong | |
3921 | process. */ | |
3922 | current_thread = NULL; | |
0d62e5e8 DJ |
3923 | } |
3924 | } | |
3925 | ||
13e567af TBA |
3926 | bool |
3927 | linux_process_target::stuck_in_jump_pad (thread_info *thread) | |
fa593d66 | 3928 | { |
d86d4aaf | 3929 | struct lwp_info *lwp = get_thread_lwp (thread); |
fa593d66 | 3930 | |
863d01bd PA |
3931 | if (lwp->suspended != 0) |
3932 | { | |
3933 | internal_error (__FILE__, __LINE__, | |
3934 | "LWP %ld is suspended, suspended=%d\n", | |
3935 | lwpid_of (thread), lwp->suspended); | |
3936 | } | |
fa593d66 PA |
3937 | gdb_assert (lwp->stopped); |
3938 | ||
3939 | /* Allow debugging the jump pad, gdb_collect, etc.. */ | |
3940 | return (supports_fast_tracepoints () | |
58b4daa5 | 3941 | && agent_loaded_p () |
fa593d66 | 3942 | && (gdb_breakpoint_here (lwp->stop_pc) |
15c66dd6 | 3943 | || lwp->stop_reason == TARGET_STOPPED_BY_WATCHPOINT |
fa593d66 | 3944 | || thread->last_resume_kind == resume_step) |
229d26fc SM |
3945 | && (linux_fast_tracepoint_collecting (lwp, NULL) |
3946 | != fast_tpoint_collect_result::not_collecting)); | |
fa593d66 PA |
3947 | } |
3948 | ||
d16f3f6c TBA |
3949 | void |
3950 | linux_process_target::move_out_of_jump_pad (thread_info *thread) | |
fa593d66 | 3951 | { |
f0ce0d3a | 3952 | struct thread_info *saved_thread; |
d86d4aaf | 3953 | struct lwp_info *lwp = get_thread_lwp (thread); |
fa593d66 PA |
3954 | int *wstat; |
3955 | ||
863d01bd PA |
3956 | if (lwp->suspended != 0) |
3957 | { | |
3958 | internal_error (__FILE__, __LINE__, | |
3959 | "LWP %ld is suspended, suspended=%d\n", | |
3960 | lwpid_of (thread), lwp->suspended); | |
3961 | } | |
fa593d66 PA |
3962 | gdb_assert (lwp->stopped); |
3963 | ||
f0ce0d3a PA |
3964 | /* For gdb_breakpoint_here. */ |
3965 | saved_thread = current_thread; | |
3966 | current_thread = thread; | |
3967 | ||
fa593d66 PA |
3968 | wstat = lwp->status_pending_p ? &lwp->status_pending : NULL; |
3969 | ||
3970 | /* Allow debugging the jump pad, gdb_collect, etc. */ | |
3971 | if (!gdb_breakpoint_here (lwp->stop_pc) | |
15c66dd6 | 3972 | && lwp->stop_reason != TARGET_STOPPED_BY_WATCHPOINT |
fa593d66 PA |
3973 | && thread->last_resume_kind != resume_step |
3974 | && maybe_move_out_of_jump_pad (lwp, wstat)) | |
3975 | { | |
3976 | if (debug_threads) | |
87ce2a04 | 3977 | debug_printf ("LWP %ld needs stabilizing (in jump pad)\n", |
d86d4aaf | 3978 | lwpid_of (thread)); |
fa593d66 PA |
3979 | |
3980 | if (wstat) | |
3981 | { | |
3982 | lwp->status_pending_p = 0; | |
3983 | enqueue_one_deferred_signal (lwp, wstat); | |
3984 | ||
3985 | if (debug_threads) | |
87ce2a04 DE |
3986 | debug_printf ("Signal %d for LWP %ld deferred " |
3987 | "(in jump pad)\n", | |
d86d4aaf | 3988 | WSTOPSIG (*wstat), lwpid_of (thread)); |
fa593d66 PA |
3989 | } |
3990 | ||
df95181f | 3991 | resume_one_lwp (lwp, 0, 0, NULL); |
fa593d66 PA |
3992 | } |
3993 | else | |
863d01bd | 3994 | lwp_suspended_inc (lwp); |
f0ce0d3a PA |
3995 | |
3996 | current_thread = saved_thread; | |
fa593d66 PA |
3997 | } |
3998 | ||
5a6b0a41 SM |
3999 | static bool |
4000 | lwp_running (thread_info *thread) | |
fa593d66 | 4001 | { |
d86d4aaf | 4002 | struct lwp_info *lwp = get_thread_lwp (thread); |
fa593d66 | 4003 | |
00db26fa | 4004 | if (lwp_is_marked_dead (lwp)) |
5a6b0a41 SM |
4005 | return false; |
4006 | ||
4007 | return !lwp->stopped; | |
fa593d66 PA |
4008 | } |
4009 | ||
d16f3f6c TBA |
4010 | void |
4011 | linux_process_target::stop_all_lwps (int suspend, lwp_info *except) | |
0d62e5e8 | 4012 | { |
bde24c0a PA |
4013 | /* Should not be called recursively. */ |
4014 | gdb_assert (stopping_threads == NOT_STOPPING_THREADS); | |
4015 | ||
87ce2a04 DE |
4016 | if (debug_threads) |
4017 | { | |
4018 | debug_enter (); | |
4019 | debug_printf ("stop_all_lwps (%s, except=%s)\n", | |
4020 | suspend ? "stop-and-suspend" : "stop", | |
4021 | except != NULL | |
d86d4aaf | 4022 | ? target_pid_to_str (ptid_of (get_lwp_thread (except))) |
87ce2a04 DE |
4023 | : "none"); |
4024 | } | |
4025 | ||
bde24c0a PA |
4026 | stopping_threads = (suspend |
4027 | ? STOPPING_AND_SUSPENDING_THREADS | |
4028 | : STOPPING_THREADS); | |
7984d532 PA |
4029 | |
4030 | if (suspend) | |
df3e4dbe SM |
4031 | for_each_thread ([&] (thread_info *thread) |
4032 | { | |
4033 | suspend_and_send_sigstop (thread, except); | |
4034 | }); | |
7984d532 | 4035 | else |
df3e4dbe SM |
4036 | for_each_thread ([&] (thread_info *thread) |
4037 | { | |
4038 | send_sigstop (thread, except); | |
4039 | }); | |
4040 | ||
fa96cb38 | 4041 | wait_for_sigstop (); |
bde24c0a | 4042 | stopping_threads = NOT_STOPPING_THREADS; |
87ce2a04 DE |
4043 | |
4044 | if (debug_threads) | |
4045 | { | |
4046 | debug_printf ("stop_all_lwps done, setting stopping_threads " | |
4047 | "back to !stopping\n"); | |
4048 | debug_exit (); | |
4049 | } | |
0d62e5e8 DJ |
4050 | } |
4051 | ||
863d01bd PA |
4052 | /* Enqueue one signal in the chain of signals which need to be |
4053 | delivered to this process on next resume. */ | |
4054 | ||
4055 | static void | |
4056 | enqueue_pending_signal (struct lwp_info *lwp, int signal, siginfo_t *info) | |
4057 | { | |
8d749320 | 4058 | struct pending_signals *p_sig = XNEW (struct pending_signals); |
863d01bd | 4059 | |
863d01bd PA |
4060 | p_sig->prev = lwp->pending_signals; |
4061 | p_sig->signal = signal; | |
4062 | if (info == NULL) | |
4063 | memset (&p_sig->info, 0, sizeof (siginfo_t)); | |
4064 | else | |
4065 | memcpy (&p_sig->info, info, sizeof (siginfo_t)); | |
4066 | lwp->pending_signals = p_sig; | |
4067 | } | |
4068 | ||
df95181f TBA |
4069 | void |
4070 | linux_process_target::install_software_single_step_breakpoints (lwp_info *lwp) | |
fa5308bd | 4071 | { |
984a2c04 YQ |
4072 | struct thread_info *thread = get_lwp_thread (lwp); |
4073 | struct regcache *regcache = get_thread_regcache (thread, 1); | |
8ce47547 TT |
4074 | |
4075 | scoped_restore save_current_thread = make_scoped_restore (¤t_thread); | |
984a2c04 | 4076 | |
984a2c04 | 4077 | current_thread = thread; |
7582c77c | 4078 | std::vector<CORE_ADDR> next_pcs = low_get_next_pcs (regcache); |
fa5308bd | 4079 | |
a0ff9e1a | 4080 | for (CORE_ADDR pc : next_pcs) |
3b9a79ef | 4081 | set_single_step_breakpoint (pc, current_ptid); |
fa5308bd AT |
4082 | } |
4083 | ||
df95181f TBA |
4084 | int |
4085 | linux_process_target::single_step (lwp_info* lwp) | |
7fe5e27e AT |
4086 | { |
4087 | int step = 0; | |
4088 | ||
b31cdfa6 | 4089 | if (supports_hardware_single_step ()) |
7fe5e27e AT |
4090 | { |
4091 | step = 1; | |
4092 | } | |
7582c77c | 4093 | else if (supports_software_single_step ()) |
7fe5e27e AT |
4094 | { |
4095 | install_software_single_step_breakpoints (lwp); | |
4096 | step = 0; | |
4097 | } | |
4098 | else | |
4099 | { | |
4100 | if (debug_threads) | |
4101 | debug_printf ("stepping is not implemented on this target"); | |
4102 | } | |
4103 | ||
4104 | return step; | |
4105 | } | |
4106 | ||
35ac8b3e | 4107 | /* The signal can be delivered to the inferior if we are not trying to |
5b061e98 YQ |
4108 | finish a fast tracepoint collect. Since signal can be delivered in |
4109 | the step-over, the program may go to signal handler and trap again | |
4110 | after return from the signal handler. We can live with the spurious | |
4111 | double traps. */ | |
35ac8b3e YQ |
4112 | |
4113 | static int | |
4114 | lwp_signal_can_be_delivered (struct lwp_info *lwp) | |
4115 | { | |
229d26fc SM |
4116 | return (lwp->collecting_fast_tracepoint |
4117 | == fast_tpoint_collect_result::not_collecting); | |
35ac8b3e YQ |
4118 | } |
4119 | ||
df95181f TBA |
4120 | void |
4121 | linux_process_target::resume_one_lwp_throw (lwp_info *lwp, int step, | |
4122 | int signal, siginfo_t *info) | |
da6d8c04 | 4123 | { |
d86d4aaf | 4124 | struct thread_info *thread = get_lwp_thread (lwp); |
0bfdf32f | 4125 | struct thread_info *saved_thread; |
82075af2 | 4126 | int ptrace_request; |
c06cbd92 YQ |
4127 | struct process_info *proc = get_thread_process (thread); |
4128 | ||
4129 | /* Note that target description may not be initialised | |
4130 | (proc->tdesc == NULL) at this point because the program hasn't | |
4131 | stopped at the first instruction yet. It means GDBserver skips | |
4132 | the extra traps from the wrapper program (see option --wrapper). | |
4133 | Code in this function that requires register access should be | |
4134 | guarded by proc->tdesc == NULL or something else. */ | |
0d62e5e8 | 4135 | |
54a0b537 | 4136 | if (lwp->stopped == 0) |
0d62e5e8 DJ |
4137 | return; |
4138 | ||
65706a29 PA |
4139 | gdb_assert (lwp->waitstatus.kind == TARGET_WAITKIND_IGNORE); |
4140 | ||
229d26fc SM |
4141 | fast_tpoint_collect_result fast_tp_collecting |
4142 | = lwp->collecting_fast_tracepoint; | |
fa593d66 | 4143 | |
229d26fc SM |
4144 | gdb_assert (!stabilizing_threads |
4145 | || (fast_tp_collecting | |
4146 | != fast_tpoint_collect_result::not_collecting)); | |
fa593d66 | 4147 | |
219f2f23 PA |
4148 | /* Cancel actions that rely on GDB not changing the PC (e.g., the |
4149 | user used the "jump" command, or "set $pc = foo"). */ | |
c06cbd92 | 4150 | if (thread->while_stepping != NULL && lwp->stop_pc != get_pc (lwp)) |
219f2f23 PA |
4151 | { |
4152 | /* Collecting 'while-stepping' actions doesn't make sense | |
4153 | anymore. */ | |
d86d4aaf | 4154 | release_while_stepping_state_list (thread); |
219f2f23 PA |
4155 | } |
4156 | ||
0d62e5e8 | 4157 | /* If we have pending signals or status, and a new signal, enqueue the |
35ac8b3e YQ |
4158 | signal. Also enqueue the signal if it can't be delivered to the |
4159 | inferior right now. */ | |
0d62e5e8 | 4160 | if (signal != 0 |
fa593d66 PA |
4161 | && (lwp->status_pending_p |
4162 | || lwp->pending_signals != NULL | |
35ac8b3e | 4163 | || !lwp_signal_can_be_delivered (lwp))) |
94610ec4 YQ |
4164 | { |
4165 | enqueue_pending_signal (lwp, signal, info); | |
4166 | ||
4167 | /* Postpone any pending signal. It was enqueued above. */ | |
4168 | signal = 0; | |
4169 | } | |
0d62e5e8 | 4170 | |
d50171e4 PA |
4171 | if (lwp->status_pending_p) |
4172 | { | |
4173 | if (debug_threads) | |
94610ec4 | 4174 | debug_printf ("Not resuming lwp %ld (%s, stop %s);" |
87ce2a04 | 4175 | " has pending status\n", |
94610ec4 | 4176 | lwpid_of (thread), step ? "step" : "continue", |
87ce2a04 | 4177 | lwp->stop_expected ? "expected" : "not expected"); |
d50171e4 PA |
4178 | return; |
4179 | } | |
0d62e5e8 | 4180 | |
0bfdf32f GB |
4181 | saved_thread = current_thread; |
4182 | current_thread = thread; | |
0d62e5e8 | 4183 | |
0d62e5e8 DJ |
4184 | /* This bit needs some thinking about. If we get a signal that |
4185 | we must report while a single-step reinsert is still pending, | |
4186 | we often end up resuming the thread. It might be better to | |
4187 | (ew) allow a stack of pending events; then we could be sure that | |
4188 | the reinsert happened right away and not lose any signals. | |
4189 | ||
4190 | Making this stack would also shrink the window in which breakpoints are | |
54a0b537 | 4191 | uninserted (see comment in linux_wait_for_lwp) but not enough for |
0d62e5e8 DJ |
4192 | complete correctness, so it won't solve that problem. It may be |
4193 | worthwhile just to solve this one, however. */ | |
54a0b537 | 4194 | if (lwp->bp_reinsert != 0) |
0d62e5e8 DJ |
4195 | { |
4196 | if (debug_threads) | |
87ce2a04 DE |
4197 | debug_printf (" pending reinsert at 0x%s\n", |
4198 | paddress (lwp->bp_reinsert)); | |
d50171e4 | 4199 | |
b31cdfa6 | 4200 | if (supports_hardware_single_step ()) |
d50171e4 | 4201 | { |
229d26fc | 4202 | if (fast_tp_collecting == fast_tpoint_collect_result::not_collecting) |
fa593d66 PA |
4203 | { |
4204 | if (step == 0) | |
9986ba08 | 4205 | warning ("BAD - reinserting but not stepping."); |
fa593d66 | 4206 | if (lwp->suspended) |
9986ba08 PA |
4207 | warning ("BAD - reinserting and suspended(%d).", |
4208 | lwp->suspended); | |
fa593d66 | 4209 | } |
d50171e4 | 4210 | } |
f79b145d YQ |
4211 | |
4212 | step = maybe_hw_step (thread); | |
0d62e5e8 DJ |
4213 | } |
4214 | ||
229d26fc | 4215 | if (fast_tp_collecting == fast_tpoint_collect_result::before_insn) |
fa593d66 PA |
4216 | { |
4217 | if (debug_threads) | |
87ce2a04 DE |
4218 | debug_printf ("lwp %ld wants to get out of fast tracepoint jump pad" |
4219 | " (exit-jump-pad-bkpt)\n", | |
d86d4aaf | 4220 | lwpid_of (thread)); |
fa593d66 | 4221 | } |
229d26fc | 4222 | else if (fast_tp_collecting == fast_tpoint_collect_result::at_insn) |
fa593d66 PA |
4223 | { |
4224 | if (debug_threads) | |
87ce2a04 DE |
4225 | debug_printf ("lwp %ld wants to get out of fast tracepoint jump pad" |
4226 | " single-stepping\n", | |
d86d4aaf | 4227 | lwpid_of (thread)); |
fa593d66 | 4228 | |
b31cdfa6 | 4229 | if (supports_hardware_single_step ()) |
fa593d66 PA |
4230 | step = 1; |
4231 | else | |
38e08fca GB |
4232 | { |
4233 | internal_error (__FILE__, __LINE__, | |
4234 | "moving out of jump pad single-stepping" | |
4235 | " not implemented on this target"); | |
4236 | } | |
fa593d66 PA |
4237 | } |
4238 | ||
219f2f23 PA |
4239 | /* If we have while-stepping actions in this thread set it stepping. |
4240 | If we have a signal to deliver, it may or may not be set to | |
4241 | SIG_IGN, we don't know. Assume so, and allow collecting | |
4242 | while-stepping into a signal handler. A possible smart thing to | |
4243 | do would be to set an internal breakpoint at the signal return | |
4244 | address, continue, and carry on catching this while-stepping | |
4245 | action only when that breakpoint is hit. A future | |
4246 | enhancement. */ | |
7fe5e27e | 4247 | if (thread->while_stepping != NULL) |
219f2f23 PA |
4248 | { |
4249 | if (debug_threads) | |
87ce2a04 | 4250 | debug_printf ("lwp %ld has a while-stepping action -> forcing step.\n", |
d86d4aaf | 4251 | lwpid_of (thread)); |
7fe5e27e AT |
4252 | |
4253 | step = single_step (lwp); | |
219f2f23 PA |
4254 | } |
4255 | ||
bf9ae9d8 | 4256 | if (proc->tdesc != NULL && low_supports_breakpoints ()) |
0d62e5e8 | 4257 | { |
0bfdf32f | 4258 | struct regcache *regcache = get_thread_regcache (current_thread, 1); |
582511be | 4259 | |
bf9ae9d8 | 4260 | lwp->stop_pc = low_get_pc (regcache); |
582511be PA |
4261 | |
4262 | if (debug_threads) | |
4263 | { | |
4264 | debug_printf (" %s from pc 0x%lx\n", step ? "step" : "continue", | |
4265 | (long) lwp->stop_pc); | |
4266 | } | |
0d62e5e8 DJ |
4267 | } |
4268 | ||
35ac8b3e YQ |
4269 | /* If we have pending signals, consume one if it can be delivered to |
4270 | the inferior. */ | |
4271 | if (lwp->pending_signals != NULL && lwp_signal_can_be_delivered (lwp)) | |
0d62e5e8 DJ |
4272 | { |
4273 | struct pending_signals **p_sig; | |
4274 | ||
54a0b537 | 4275 | p_sig = &lwp->pending_signals; |
0d62e5e8 DJ |
4276 | while ((*p_sig)->prev != NULL) |
4277 | p_sig = &(*p_sig)->prev; | |
4278 | ||
4279 | signal = (*p_sig)->signal; | |
32ca6d61 | 4280 | if ((*p_sig)->info.si_signo != 0) |
d86d4aaf | 4281 | ptrace (PTRACE_SETSIGINFO, lwpid_of (thread), (PTRACE_TYPE_ARG3) 0, |
56f7af9c | 4282 | &(*p_sig)->info); |
32ca6d61 | 4283 | |
0d62e5e8 DJ |
4284 | free (*p_sig); |
4285 | *p_sig = NULL; | |
4286 | } | |
4287 | ||
94610ec4 YQ |
4288 | if (debug_threads) |
4289 | debug_printf ("Resuming lwp %ld (%s, signal %d, stop %s)\n", | |
4290 | lwpid_of (thread), step ? "step" : "continue", signal, | |
4291 | lwp->stop_expected ? "expected" : "not expected"); | |
4292 | ||
d7599cc0 | 4293 | low_prepare_to_resume (lwp); |
aa5ca48f | 4294 | |
d86d4aaf | 4295 | regcache_invalidate_thread (thread); |
da6d8c04 | 4296 | errno = 0; |
54a0b537 | 4297 | lwp->stepping = step; |
82075af2 JS |
4298 | if (step) |
4299 | ptrace_request = PTRACE_SINGLESTEP; | |
4300 | else if (gdb_catching_syscalls_p (lwp)) | |
4301 | ptrace_request = PTRACE_SYSCALL; | |
4302 | else | |
4303 | ptrace_request = PTRACE_CONT; | |
4304 | ptrace (ptrace_request, | |
4305 | lwpid_of (thread), | |
b8e1b30e | 4306 | (PTRACE_TYPE_ARG3) 0, |
14ce3065 DE |
4307 | /* Coerce to a uintptr_t first to avoid potential gcc warning |
4308 | of coercing an 8 byte integer to a 4 byte pointer. */ | |
b8e1b30e | 4309 | (PTRACE_TYPE_ARG4) (uintptr_t) signal); |
0d62e5e8 | 4310 | |
0bfdf32f | 4311 | current_thread = saved_thread; |
da6d8c04 | 4312 | if (errno) |
23f238d3 PA |
4313 | perror_with_name ("resuming thread"); |
4314 | ||
4315 | /* Successfully resumed. Clear state that no longer makes sense, | |
4316 | and mark the LWP as running. Must not do this before resuming | |
4317 | otherwise if that fails other code will be confused. E.g., we'd | |
4318 | later try to stop the LWP and hang forever waiting for a stop | |
4319 | status. Note that we must not throw after this is cleared, | |
4320 | otherwise handle_zombie_lwp_error would get confused. */ | |
4321 | lwp->stopped = 0; | |
4322 | lwp->stop_reason = TARGET_STOPPED_BY_NO_REASON; | |
4323 | } | |
4324 | ||
d7599cc0 TBA |
4325 | void |
4326 | linux_process_target::low_prepare_to_resume (lwp_info *lwp) | |
4327 | { | |
4328 | /* Nop. */ | |
4329 | } | |
4330 | ||
23f238d3 PA |
4331 | /* Called when we try to resume a stopped LWP and that errors out. If |
4332 | the LWP is no longer in ptrace-stopped state (meaning it's zombie, | |
4333 | or about to become), discard the error, clear any pending status | |
4334 | the LWP may have, and return true (we'll collect the exit status | |
4335 | soon enough). Otherwise, return false. */ | |
4336 | ||
4337 | static int | |
4338 | check_ptrace_stopped_lwp_gone (struct lwp_info *lp) | |
4339 | { | |
4340 | struct thread_info *thread = get_lwp_thread (lp); | |
4341 | ||
4342 | /* If we get an error after resuming the LWP successfully, we'd | |
4343 | confuse !T state for the LWP being gone. */ | |
4344 | gdb_assert (lp->stopped); | |
4345 | ||
4346 | /* We can't just check whether the LWP is in 'Z (Zombie)' state, | |
4347 | because even if ptrace failed with ESRCH, the tracee may be "not | |
4348 | yet fully dead", but already refusing ptrace requests. In that | |
4349 | case the tracee has 'R (Running)' state for a little bit | |
4350 | (observed in Linux 3.18). See also the note on ESRCH in the | |
4351 | ptrace(2) man page. Instead, check whether the LWP has any state | |
4352 | other than ptrace-stopped. */ | |
4353 | ||
4354 | /* Don't assume anything if /proc/PID/status can't be read. */ | |
4355 | if (linux_proc_pid_is_trace_stopped_nowarn (lwpid_of (thread)) == 0) | |
3221518c | 4356 | { |
23f238d3 PA |
4357 | lp->stop_reason = TARGET_STOPPED_BY_NO_REASON; |
4358 | lp->status_pending_p = 0; | |
4359 | return 1; | |
4360 | } | |
4361 | return 0; | |
4362 | } | |
4363 | ||
df95181f TBA |
4364 | void |
4365 | linux_process_target::resume_one_lwp (lwp_info *lwp, int step, int signal, | |
4366 | siginfo_t *info) | |
23f238d3 | 4367 | { |
a70b8144 | 4368 | try |
23f238d3 | 4369 | { |
df95181f | 4370 | resume_one_lwp_throw (lwp, step, signal, info); |
23f238d3 | 4371 | } |
230d2906 | 4372 | catch (const gdb_exception_error &ex) |
23f238d3 PA |
4373 | { |
4374 | if (!check_ptrace_stopped_lwp_gone (lwp)) | |
eedc3f4f | 4375 | throw; |
3221518c | 4376 | } |
da6d8c04 DJ |
4377 | } |
4378 | ||
5fdda392 SM |
4379 | /* This function is called once per thread via for_each_thread. |
4380 | We look up which resume request applies to THREAD and mark it with a | |
4381 | pointer to the appropriate resume request. | |
5544ad89 DJ |
4382 | |
4383 | This algorithm is O(threads * resume elements), but resume elements | |
4384 | is small (and will remain small at least until GDB supports thread | |
4385 | suspension). */ | |
ebcf782c | 4386 | |
5fdda392 SM |
4387 | static void |
4388 | linux_set_resume_request (thread_info *thread, thread_resume *resume, size_t n) | |
0d62e5e8 | 4389 | { |
d86d4aaf | 4390 | struct lwp_info *lwp = get_thread_lwp (thread); |
64386c31 | 4391 | |
5fdda392 | 4392 | for (int ndx = 0; ndx < n; ndx++) |
95954743 | 4393 | { |
5fdda392 | 4394 | ptid_t ptid = resume[ndx].thread; |
d7e15655 | 4395 | if (ptid == minus_one_ptid |
9c80ecd6 | 4396 | || ptid == thread->id |
0c9070b3 YQ |
4397 | /* Handle both 'pPID' and 'pPID.-1' as meaning 'all threads |
4398 | of PID'. */ | |
e99b03dc | 4399 | || (ptid.pid () == pid_of (thread) |
0e998d96 | 4400 | && (ptid.is_pid () |
e38504b3 | 4401 | || ptid.lwp () == -1))) |
95954743 | 4402 | { |
5fdda392 | 4403 | if (resume[ndx].kind == resume_stop |
8336d594 | 4404 | && thread->last_resume_kind == resume_stop) |
d50171e4 PA |
4405 | { |
4406 | if (debug_threads) | |
87ce2a04 DE |
4407 | debug_printf ("already %s LWP %ld at GDB's request\n", |
4408 | (thread->last_status.kind | |
4409 | == TARGET_WAITKIND_STOPPED) | |
4410 | ? "stopped" | |
4411 | : "stopping", | |
d86d4aaf | 4412 | lwpid_of (thread)); |
d50171e4 PA |
4413 | |
4414 | continue; | |
4415 | } | |
4416 | ||
5a04c4cf PA |
4417 | /* Ignore (wildcard) resume requests for already-resumed |
4418 | threads. */ | |
5fdda392 | 4419 | if (resume[ndx].kind != resume_stop |
5a04c4cf PA |
4420 | && thread->last_resume_kind != resume_stop) |
4421 | { | |
4422 | if (debug_threads) | |
4423 | debug_printf ("already %s LWP %ld at GDB's request\n", | |
4424 | (thread->last_resume_kind | |
4425 | == resume_step) | |
4426 | ? "stepping" | |
4427 | : "continuing", | |
4428 | lwpid_of (thread)); | |
4429 | continue; | |
4430 | } | |
4431 | ||
4432 | /* Don't let wildcard resumes resume fork children that GDB | |
4433 | does not yet know are new fork children. */ | |
4434 | if (lwp->fork_relative != NULL) | |
4435 | { | |
5a04c4cf PA |
4436 | struct lwp_info *rel = lwp->fork_relative; |
4437 | ||
4438 | if (rel->status_pending_p | |
4439 | && (rel->waitstatus.kind == TARGET_WAITKIND_FORKED | |
4440 | || rel->waitstatus.kind == TARGET_WAITKIND_VFORKED)) | |
4441 | { | |
4442 | if (debug_threads) | |
4443 | debug_printf ("not resuming LWP %ld: has queued stop reply\n", | |
4444 | lwpid_of (thread)); | |
4445 | continue; | |
4446 | } | |
4447 | } | |
4448 | ||
4449 | /* If the thread has a pending event that has already been | |
4450 | reported to GDBserver core, but GDB has not pulled the | |
4451 | event out of the vStopped queue yet, likewise, ignore the | |
4452 | (wildcard) resume request. */ | |
9c80ecd6 | 4453 | if (in_queued_stop_replies (thread->id)) |
5a04c4cf PA |
4454 | { |
4455 | if (debug_threads) | |
4456 | debug_printf ("not resuming LWP %ld: has queued stop reply\n", | |
4457 | lwpid_of (thread)); | |
4458 | continue; | |
4459 | } | |
4460 | ||
5fdda392 | 4461 | lwp->resume = &resume[ndx]; |
8336d594 | 4462 | thread->last_resume_kind = lwp->resume->kind; |
fa593d66 | 4463 | |
c2d6af84 PA |
4464 | lwp->step_range_start = lwp->resume->step_range_start; |
4465 | lwp->step_range_end = lwp->resume->step_range_end; | |
4466 | ||
fa593d66 PA |
4467 | /* If we had a deferred signal to report, dequeue one now. |
4468 | This can happen if LWP gets more than one signal while | |
4469 | trying to get out of a jump pad. */ | |
4470 | if (lwp->stopped | |
4471 | && !lwp->status_pending_p | |
4472 | && dequeue_one_deferred_signal (lwp, &lwp->status_pending)) | |
4473 | { | |
4474 | lwp->status_pending_p = 1; | |
4475 | ||
4476 | if (debug_threads) | |
87ce2a04 DE |
4477 | debug_printf ("Dequeueing deferred signal %d for LWP %ld, " |
4478 | "leaving status pending.\n", | |
d86d4aaf DE |
4479 | WSTOPSIG (lwp->status_pending), |
4480 | lwpid_of (thread)); | |
fa593d66 PA |
4481 | } |
4482 | ||
5fdda392 | 4483 | return; |
95954743 PA |
4484 | } |
4485 | } | |
2bd7c093 PA |
4486 | |
4487 | /* No resume action for this thread. */ | |
4488 | lwp->resume = NULL; | |
5544ad89 DJ |
4489 | } |
4490 | ||
df95181f TBA |
4491 | bool |
4492 | linux_process_target::resume_status_pending (thread_info *thread) | |
5544ad89 | 4493 | { |
d86d4aaf | 4494 | struct lwp_info *lwp = get_thread_lwp (thread); |
5544ad89 | 4495 | |
bd99dc85 PA |
4496 | /* LWPs which will not be resumed are not interesting, because |
4497 | we might not wait for them next time through linux_wait. */ | |
2bd7c093 | 4498 | if (lwp->resume == NULL) |
25c28b4d | 4499 | return false; |
64386c31 | 4500 | |
df95181f | 4501 | return thread_still_has_status_pending (thread); |
d50171e4 PA |
4502 | } |
4503 | ||
df95181f TBA |
4504 | bool |
4505 | linux_process_target::thread_needs_step_over (thread_info *thread) | |
d50171e4 | 4506 | { |
d86d4aaf | 4507 | struct lwp_info *lwp = get_thread_lwp (thread); |
0bfdf32f | 4508 | struct thread_info *saved_thread; |
d50171e4 | 4509 | CORE_ADDR pc; |
c06cbd92 YQ |
4510 | struct process_info *proc = get_thread_process (thread); |
4511 | ||
4512 | /* GDBserver is skipping the extra traps from the wrapper program, | |
4513 | don't have to do step over. */ | |
4514 | if (proc->tdesc == NULL) | |
eca55aec | 4515 | return false; |
d50171e4 PA |
4516 | |
4517 | /* LWPs which will not be resumed are not interesting, because we | |
4518 | might not wait for them next time through linux_wait. */ | |
4519 | ||
4520 | if (!lwp->stopped) | |
4521 | { | |
4522 | if (debug_threads) | |
87ce2a04 | 4523 | debug_printf ("Need step over [LWP %ld]? Ignoring, not stopped\n", |
d86d4aaf | 4524 | lwpid_of (thread)); |
eca55aec | 4525 | return false; |
d50171e4 PA |
4526 | } |
4527 | ||
8336d594 | 4528 | if (thread->last_resume_kind == resume_stop) |
d50171e4 PA |
4529 | { |
4530 | if (debug_threads) | |
87ce2a04 DE |
4531 | debug_printf ("Need step over [LWP %ld]? Ignoring, should remain" |
4532 | " stopped\n", | |
d86d4aaf | 4533 | lwpid_of (thread)); |
eca55aec | 4534 | return false; |
d50171e4 PA |
4535 | } |
4536 | ||
7984d532 PA |
4537 | gdb_assert (lwp->suspended >= 0); |
4538 | ||
4539 | if (lwp->suspended) | |
4540 | { | |
4541 | if (debug_threads) | |
87ce2a04 | 4542 | debug_printf ("Need step over [LWP %ld]? Ignoring, suspended\n", |
d86d4aaf | 4543 | lwpid_of (thread)); |
eca55aec | 4544 | return false; |
7984d532 PA |
4545 | } |
4546 | ||
bd99dc85 | 4547 | if (lwp->status_pending_p) |
d50171e4 PA |
4548 | { |
4549 | if (debug_threads) | |
87ce2a04 DE |
4550 | debug_printf ("Need step over [LWP %ld]? Ignoring, has pending" |
4551 | " status.\n", | |
d86d4aaf | 4552 | lwpid_of (thread)); |
eca55aec | 4553 | return false; |
d50171e4 PA |
4554 | } |
4555 | ||
4556 | /* Note: PC, not STOP_PC. Either GDB has adjusted the PC already, | |
4557 | or we have. */ | |
4558 | pc = get_pc (lwp); | |
4559 | ||
4560 | /* If the PC has changed since we stopped, then don't do anything, | |
4561 | and let the breakpoint/tracepoint be hit. This happens if, for | |
4562 | instance, GDB handled the decr_pc_after_break subtraction itself, | |
4563 | GDB is OOL stepping this thread, or the user has issued a "jump" | |
4564 | command, or poked thread's registers herself. */ | |
4565 | if (pc != lwp->stop_pc) | |
4566 | { | |
4567 | if (debug_threads) | |
87ce2a04 DE |
4568 | debug_printf ("Need step over [LWP %ld]? Cancelling, PC was changed. " |
4569 | "Old stop_pc was 0x%s, PC is now 0x%s\n", | |
d86d4aaf DE |
4570 | lwpid_of (thread), |
4571 | paddress (lwp->stop_pc), paddress (pc)); | |
eca55aec | 4572 | return false; |
d50171e4 PA |
4573 | } |
4574 | ||
484b3c32 YQ |
4575 | /* On software single step target, resume the inferior with signal |
4576 | rather than stepping over. */ | |
7582c77c | 4577 | if (supports_software_single_step () |
484b3c32 YQ |
4578 | && lwp->pending_signals != NULL |
4579 | && lwp_signal_can_be_delivered (lwp)) | |
4580 | { | |
4581 | if (debug_threads) | |
4582 | debug_printf ("Need step over [LWP %ld]? Ignoring, has pending" | |
4583 | " signals.\n", | |
4584 | lwpid_of (thread)); | |
4585 | ||
eca55aec | 4586 | return false; |
484b3c32 YQ |
4587 | } |
4588 | ||
0bfdf32f GB |
4589 | saved_thread = current_thread; |
4590 | current_thread = thread; | |
d50171e4 | 4591 | |
8b07ae33 | 4592 | /* We can only step over breakpoints we know about. */ |
fa593d66 | 4593 | if (breakpoint_here (pc) || fast_tracepoint_jump_here (pc)) |
d50171e4 | 4594 | { |
8b07ae33 | 4595 | /* Don't step over a breakpoint that GDB expects to hit |
9f3a5c85 LM |
4596 | though. If the condition is being evaluated on the target's side |
4597 | and it evaluate to false, step over this breakpoint as well. */ | |
4598 | if (gdb_breakpoint_here (pc) | |
d3ce09f5 SS |
4599 | && gdb_condition_true_at_breakpoint (pc) |
4600 | && gdb_no_commands_at_breakpoint (pc)) | |
8b07ae33 PA |
4601 | { |
4602 | if (debug_threads) | |
87ce2a04 DE |
4603 | debug_printf ("Need step over [LWP %ld]? yes, but found" |
4604 | " GDB breakpoint at 0x%s; skipping step over\n", | |
d86d4aaf | 4605 | lwpid_of (thread), paddress (pc)); |
d50171e4 | 4606 | |
0bfdf32f | 4607 | current_thread = saved_thread; |
eca55aec | 4608 | return false; |
8b07ae33 PA |
4609 | } |
4610 | else | |
4611 | { | |
4612 | if (debug_threads) | |
87ce2a04 DE |
4613 | debug_printf ("Need step over [LWP %ld]? yes, " |
4614 | "found breakpoint at 0x%s\n", | |
d86d4aaf | 4615 | lwpid_of (thread), paddress (pc)); |
d50171e4 | 4616 | |
8b07ae33 | 4617 | /* We've found an lwp that needs stepping over --- return 1 so |
8f86d7aa | 4618 | that find_thread stops looking. */ |
0bfdf32f | 4619 | current_thread = saved_thread; |
8b07ae33 | 4620 | |
eca55aec | 4621 | return true; |
8b07ae33 | 4622 | } |
d50171e4 PA |
4623 | } |
4624 | ||
0bfdf32f | 4625 | current_thread = saved_thread; |
d50171e4 PA |
4626 | |
4627 | if (debug_threads) | |
87ce2a04 DE |
4628 | debug_printf ("Need step over [LWP %ld]? No, no breakpoint found" |
4629 | " at 0x%s\n", | |
d86d4aaf | 4630 | lwpid_of (thread), paddress (pc)); |
c6ecbae5 | 4631 | |
eca55aec | 4632 | return false; |
5544ad89 DJ |
4633 | } |
4634 | ||
d16f3f6c TBA |
4635 | void |
4636 | linux_process_target::start_step_over (lwp_info *lwp) | |
d50171e4 | 4637 | { |
d86d4aaf | 4638 | struct thread_info *thread = get_lwp_thread (lwp); |
0bfdf32f | 4639 | struct thread_info *saved_thread; |
d50171e4 PA |
4640 | CORE_ADDR pc; |
4641 | int step; | |
4642 | ||
4643 | if (debug_threads) | |
87ce2a04 | 4644 | debug_printf ("Starting step-over on LWP %ld. Stopping all threads\n", |
d86d4aaf | 4645 | lwpid_of (thread)); |
d50171e4 | 4646 | |
7984d532 | 4647 | stop_all_lwps (1, lwp); |
863d01bd PA |
4648 | |
4649 | if (lwp->suspended != 0) | |
4650 | { | |
4651 | internal_error (__FILE__, __LINE__, | |
4652 | "LWP %ld suspended=%d\n", lwpid_of (thread), | |
4653 | lwp->suspended); | |
4654 | } | |
d50171e4 PA |
4655 | |
4656 | if (debug_threads) | |
87ce2a04 | 4657 | debug_printf ("Done stopping all threads for step-over.\n"); |
d50171e4 PA |
4658 | |
4659 | /* Note, we should always reach here with an already adjusted PC, | |
4660 | either by GDB (if we're resuming due to GDB's request), or by our | |
4661 | caller, if we just finished handling an internal breakpoint GDB | |
4662 | shouldn't care about. */ | |
4663 | pc = get_pc (lwp); | |
4664 | ||
0bfdf32f GB |
4665 | saved_thread = current_thread; |
4666 | current_thread = thread; | |
d50171e4 PA |
4667 | |
4668 | lwp->bp_reinsert = pc; | |
4669 | uninsert_breakpoints_at (pc); | |
fa593d66 | 4670 | uninsert_fast_tracepoint_jumps_at (pc); |
d50171e4 | 4671 | |
7fe5e27e | 4672 | step = single_step (lwp); |
d50171e4 | 4673 | |
0bfdf32f | 4674 | current_thread = saved_thread; |
d50171e4 | 4675 | |
df95181f | 4676 | resume_one_lwp (lwp, step, 0, NULL); |
d50171e4 PA |
4677 | |
4678 | /* Require next event from this LWP. */ | |
9c80ecd6 | 4679 | step_over_bkpt = thread->id; |
d50171e4 PA |
4680 | } |
4681 | ||
b31cdfa6 TBA |
4682 | bool |
4683 | linux_process_target::finish_step_over (lwp_info *lwp) | |
d50171e4 PA |
4684 | { |
4685 | if (lwp->bp_reinsert != 0) | |
4686 | { | |
f79b145d YQ |
4687 | struct thread_info *saved_thread = current_thread; |
4688 | ||
d50171e4 | 4689 | if (debug_threads) |
87ce2a04 | 4690 | debug_printf ("Finished step over.\n"); |
d50171e4 | 4691 | |
f79b145d YQ |
4692 | current_thread = get_lwp_thread (lwp); |
4693 | ||
d50171e4 PA |
4694 | /* Reinsert any breakpoint at LWP->BP_REINSERT. Note that there |
4695 | may be no breakpoint to reinsert there by now. */ | |
4696 | reinsert_breakpoints_at (lwp->bp_reinsert); | |
fa593d66 | 4697 | reinsert_fast_tracepoint_jumps_at (lwp->bp_reinsert); |
d50171e4 PA |
4698 | |
4699 | lwp->bp_reinsert = 0; | |
4700 | ||
3b9a79ef YQ |
4701 | /* Delete any single-step breakpoints. No longer needed. We |
4702 | don't have to worry about other threads hitting this trap, | |
4703 | and later not being able to explain it, because we were | |
4704 | stepping over a breakpoint, and we hold all threads but | |
4705 | LWP stopped while doing that. */ | |
b31cdfa6 | 4706 | if (!supports_hardware_single_step ()) |
f79b145d | 4707 | { |
3b9a79ef YQ |
4708 | gdb_assert (has_single_step_breakpoints (current_thread)); |
4709 | delete_single_step_breakpoints (current_thread); | |
f79b145d | 4710 | } |
d50171e4 PA |
4711 | |
4712 | step_over_bkpt = null_ptid; | |
f79b145d | 4713 | current_thread = saved_thread; |
b31cdfa6 | 4714 | return true; |
d50171e4 PA |
4715 | } |
4716 | else | |
b31cdfa6 | 4717 | return false; |
d50171e4 PA |
4718 | } |
4719 | ||
d16f3f6c TBA |
4720 | void |
4721 | linux_process_target::complete_ongoing_step_over () | |
863d01bd | 4722 | { |
d7e15655 | 4723 | if (step_over_bkpt != null_ptid) |
863d01bd PA |
4724 | { |
4725 | struct lwp_info *lwp; | |
4726 | int wstat; | |
4727 | int ret; | |
4728 | ||
4729 | if (debug_threads) | |
4730 | debug_printf ("detach: step over in progress, finish it first\n"); | |
4731 | ||
4732 | /* Passing NULL_PTID as filter indicates we want all events to | |
4733 | be left pending. Eventually this returns when there are no | |
4734 | unwaited-for children left. */ | |
d16f3f6c TBA |
4735 | ret = wait_for_event_filtered (minus_one_ptid, null_ptid, &wstat, |
4736 | __WALL); | |
863d01bd PA |
4737 | gdb_assert (ret == -1); |
4738 | ||
4739 | lwp = find_lwp_pid (step_over_bkpt); | |
4740 | if (lwp != NULL) | |
4741 | finish_step_over (lwp); | |
4742 | step_over_bkpt = null_ptid; | |
4743 | unsuspend_all_lwps (lwp); | |
4744 | } | |
4745 | } | |
4746 | ||
df95181f TBA |
4747 | void |
4748 | linux_process_target::resume_one_thread (thread_info *thread, | |
4749 | bool leave_all_stopped) | |
5544ad89 | 4750 | { |
d86d4aaf | 4751 | struct lwp_info *lwp = get_thread_lwp (thread); |
d50171e4 | 4752 | int leave_pending; |
5544ad89 | 4753 | |
2bd7c093 | 4754 | if (lwp->resume == NULL) |
c80825ff | 4755 | return; |
5544ad89 | 4756 | |
bd99dc85 | 4757 | if (lwp->resume->kind == resume_stop) |
5544ad89 | 4758 | { |
bd99dc85 | 4759 | if (debug_threads) |
d86d4aaf | 4760 | debug_printf ("resume_stop request for LWP %ld\n", lwpid_of (thread)); |
bd99dc85 PA |
4761 | |
4762 | if (!lwp->stopped) | |
4763 | { | |
4764 | if (debug_threads) | |
d86d4aaf | 4765 | debug_printf ("stopping LWP %ld\n", lwpid_of (thread)); |
bd99dc85 | 4766 | |
d50171e4 PA |
4767 | /* Stop the thread, and wait for the event asynchronously, |
4768 | through the event loop. */ | |
02fc4de7 | 4769 | send_sigstop (lwp); |
bd99dc85 PA |
4770 | } |
4771 | else | |
4772 | { | |
4773 | if (debug_threads) | |
87ce2a04 | 4774 | debug_printf ("already stopped LWP %ld\n", |
d86d4aaf | 4775 | lwpid_of (thread)); |
d50171e4 PA |
4776 | |
4777 | /* The LWP may have been stopped in an internal event that | |
4778 | was not meant to be notified back to GDB (e.g., gdbserver | |
4779 | breakpoint), so we should be reporting a stop event in | |
4780 | this case too. */ | |
4781 | ||
4782 | /* If the thread already has a pending SIGSTOP, this is a | |
4783 | no-op. Otherwise, something later will presumably resume | |
4784 | the thread and this will cause it to cancel any pending | |
4785 | operation, due to last_resume_kind == resume_stop. If | |
4786 | the thread already has a pending status to report, we | |
4787 | will still report it the next time we wait - see | |
4788 | status_pending_p_callback. */ | |
1a981360 PA |
4789 | |
4790 | /* If we already have a pending signal to report, then | |
4791 | there's no need to queue a SIGSTOP, as this means we're | |
4792 | midway through moving the LWP out of the jumppad, and we | |
4793 | will report the pending signal as soon as that is | |
4794 | finished. */ | |
4795 | if (lwp->pending_signals_to_report == NULL) | |
4796 | send_sigstop (lwp); | |
bd99dc85 | 4797 | } |
32ca6d61 | 4798 | |
bd99dc85 PA |
4799 | /* For stop requests, we're done. */ |
4800 | lwp->resume = NULL; | |
fc7238bb | 4801 | thread->last_status.kind = TARGET_WAITKIND_IGNORE; |
c80825ff | 4802 | return; |
5544ad89 DJ |
4803 | } |
4804 | ||
bd99dc85 | 4805 | /* If this thread which is about to be resumed has a pending status, |
863d01bd PA |
4806 | then don't resume it - we can just report the pending status. |
4807 | Likewise if it is suspended, because e.g., another thread is | |
4808 | stepping past a breakpoint. Make sure to queue any signals that | |
4809 | would otherwise be sent. In all-stop mode, we do this decision | |
4810 | based on if *any* thread has a pending status. If there's a | |
4811 | thread that needs the step-over-breakpoint dance, then don't | |
4812 | resume any other thread but that particular one. */ | |
4813 | leave_pending = (lwp->suspended | |
4814 | || lwp->status_pending_p | |
4815 | || leave_all_stopped); | |
5544ad89 | 4816 | |
0e9a339e YQ |
4817 | /* If we have a new signal, enqueue the signal. */ |
4818 | if (lwp->resume->sig != 0) | |
4819 | { | |
4820 | siginfo_t info, *info_p; | |
4821 | ||
4822 | /* If this is the same signal we were previously stopped by, | |
4823 | make sure to queue its siginfo. */ | |
4824 | if (WIFSTOPPED (lwp->last_status) | |
4825 | && WSTOPSIG (lwp->last_status) == lwp->resume->sig | |
4826 | && ptrace (PTRACE_GETSIGINFO, lwpid_of (thread), | |
4827 | (PTRACE_TYPE_ARG3) 0, &info) == 0) | |
4828 | info_p = &info; | |
4829 | else | |
4830 | info_p = NULL; | |
4831 | ||
4832 | enqueue_pending_signal (lwp, lwp->resume->sig, info_p); | |
4833 | } | |
4834 | ||
d50171e4 | 4835 | if (!leave_pending) |
bd99dc85 PA |
4836 | { |
4837 | if (debug_threads) | |
d86d4aaf | 4838 | debug_printf ("resuming LWP %ld\n", lwpid_of (thread)); |
5544ad89 | 4839 | |
9c80ecd6 | 4840 | proceed_one_lwp (thread, NULL); |
bd99dc85 PA |
4841 | } |
4842 | else | |
4843 | { | |
4844 | if (debug_threads) | |
d86d4aaf | 4845 | debug_printf ("leaving LWP %ld stopped\n", lwpid_of (thread)); |
bd99dc85 | 4846 | } |
5544ad89 | 4847 | |
fc7238bb | 4848 | thread->last_status.kind = TARGET_WAITKIND_IGNORE; |
bd99dc85 | 4849 | lwp->resume = NULL; |
0d62e5e8 DJ |
4850 | } |
4851 | ||
0e4d7e35 TBA |
4852 | void |
4853 | linux_process_target::resume (thread_resume *resume_info, size_t n) | |
0d62e5e8 | 4854 | { |
d86d4aaf | 4855 | struct thread_info *need_step_over = NULL; |
c6ecbae5 | 4856 | |
87ce2a04 DE |
4857 | if (debug_threads) |
4858 | { | |
4859 | debug_enter (); | |
4860 | debug_printf ("linux_resume:\n"); | |
4861 | } | |
4862 | ||
5fdda392 SM |
4863 | for_each_thread ([&] (thread_info *thread) |
4864 | { | |
4865 | linux_set_resume_request (thread, resume_info, n); | |
4866 | }); | |
5544ad89 | 4867 | |
d50171e4 PA |
4868 | /* If there is a thread which would otherwise be resumed, which has |
4869 | a pending status, then don't resume any threads - we can just | |
4870 | report the pending status. Make sure to queue any signals that | |
4871 | would otherwise be sent. In non-stop mode, we'll apply this | |
4872 | logic to each thread individually. We consume all pending events | |
4873 | before considering to start a step-over (in all-stop). */ | |
25c28b4d | 4874 | bool any_pending = false; |
bd99dc85 | 4875 | if (!non_stop) |
df95181f TBA |
4876 | any_pending = find_thread ([this] (thread_info *thread) |
4877 | { | |
4878 | return resume_status_pending (thread); | |
4879 | }) != nullptr; | |
d50171e4 PA |
4880 | |
4881 | /* If there is a thread which would otherwise be resumed, which is | |
4882 | stopped at a breakpoint that needs stepping over, then don't | |
4883 | resume any threads - have it step over the breakpoint with all | |
4884 | other threads stopped, then resume all threads again. Make sure | |
4885 | to queue any signals that would otherwise be delivered or | |
4886 | queued. */ | |
bf9ae9d8 | 4887 | if (!any_pending && low_supports_breakpoints ()) |
df95181f TBA |
4888 | need_step_over = find_thread ([this] (thread_info *thread) |
4889 | { | |
4890 | return thread_needs_step_over (thread); | |
4891 | }); | |
d50171e4 | 4892 | |
c80825ff | 4893 | bool leave_all_stopped = (need_step_over != NULL || any_pending); |
d50171e4 PA |
4894 | |
4895 | if (debug_threads) | |
4896 | { | |
4897 | if (need_step_over != NULL) | |
87ce2a04 | 4898 | debug_printf ("Not resuming all, need step over\n"); |
d50171e4 | 4899 | else if (any_pending) |
87ce2a04 DE |
4900 | debug_printf ("Not resuming, all-stop and found " |
4901 | "an LWP with pending status\n"); | |
d50171e4 | 4902 | else |
87ce2a04 | 4903 | debug_printf ("Resuming, no pending status or step over needed\n"); |
d50171e4 PA |
4904 | } |
4905 | ||
4906 | /* Even if we're leaving threads stopped, queue all signals we'd | |
4907 | otherwise deliver. */ | |
c80825ff SM |
4908 | for_each_thread ([&] (thread_info *thread) |
4909 | { | |
df95181f | 4910 | resume_one_thread (thread, leave_all_stopped); |
c80825ff | 4911 | }); |
d50171e4 PA |
4912 | |
4913 | if (need_step_over) | |
d86d4aaf | 4914 | start_step_over (get_thread_lwp (need_step_over)); |
87ce2a04 DE |
4915 | |
4916 | if (debug_threads) | |
4917 | { | |
4918 | debug_printf ("linux_resume done\n"); | |
4919 | debug_exit (); | |
4920 | } | |
1bebeeca PA |
4921 | |
4922 | /* We may have events that were pending that can/should be sent to | |
4923 | the client now. Trigger a linux_wait call. */ | |
4924 | if (target_is_async_p ()) | |
4925 | async_file_mark (); | |
d50171e4 PA |
4926 | } |
4927 | ||
df95181f TBA |
4928 | void |
4929 | linux_process_target::proceed_one_lwp (thread_info *thread, lwp_info *except) | |
d50171e4 | 4930 | { |
d86d4aaf | 4931 | struct lwp_info *lwp = get_thread_lwp (thread); |
d50171e4 PA |
4932 | int step; |
4933 | ||
7984d532 | 4934 | if (lwp == except) |
e2b44075 | 4935 | return; |
d50171e4 PA |
4936 | |
4937 | if (debug_threads) | |
d86d4aaf | 4938 | debug_printf ("proceed_one_lwp: lwp %ld\n", lwpid_of (thread)); |
d50171e4 PA |
4939 | |
4940 | if (!lwp->stopped) | |
4941 | { | |
4942 | if (debug_threads) | |
d86d4aaf | 4943 | debug_printf (" LWP %ld already running\n", lwpid_of (thread)); |
e2b44075 | 4944 | return; |
d50171e4 PA |
4945 | } |
4946 | ||
02fc4de7 PA |
4947 | if (thread->last_resume_kind == resume_stop |
4948 | && thread->last_status.kind != TARGET_WAITKIND_IGNORE) | |
d50171e4 PA |
4949 | { |
4950 | if (debug_threads) | |
87ce2a04 | 4951 | debug_printf (" client wants LWP to remain %ld stopped\n", |
d86d4aaf | 4952 | lwpid_of (thread)); |
e2b44075 | 4953 | return; |
d50171e4 PA |
4954 | } |
4955 | ||
4956 | if (lwp->status_pending_p) | |
4957 | { | |
4958 | if (debug_threads) | |
87ce2a04 | 4959 | debug_printf (" LWP %ld has pending status, leaving stopped\n", |
d86d4aaf | 4960 | lwpid_of (thread)); |
e2b44075 | 4961 | return; |
d50171e4 PA |
4962 | } |
4963 | ||
7984d532 PA |
4964 | gdb_assert (lwp->suspended >= 0); |
4965 | ||
d50171e4 PA |
4966 | if (lwp->suspended) |
4967 | { | |
4968 | if (debug_threads) | |
d86d4aaf | 4969 | debug_printf (" LWP %ld is suspended\n", lwpid_of (thread)); |
e2b44075 | 4970 | return; |
d50171e4 PA |
4971 | } |
4972 | ||
1a981360 PA |
4973 | if (thread->last_resume_kind == resume_stop |
4974 | && lwp->pending_signals_to_report == NULL | |
229d26fc SM |
4975 | && (lwp->collecting_fast_tracepoint |
4976 | == fast_tpoint_collect_result::not_collecting)) | |
02fc4de7 PA |
4977 | { |
4978 | /* We haven't reported this LWP as stopped yet (otherwise, the | |
4979 | last_status.kind check above would catch it, and we wouldn't | |
4980 | reach here. This LWP may have been momentarily paused by a | |
4981 | stop_all_lwps call while handling for example, another LWP's | |
4982 | step-over. In that case, the pending expected SIGSTOP signal | |
4983 | that was queued at vCont;t handling time will have already | |
4984 | been consumed by wait_for_sigstop, and so we need to requeue | |
4985 | another one here. Note that if the LWP already has a SIGSTOP | |
4986 | pending, this is a no-op. */ | |
4987 | ||
4988 | if (debug_threads) | |
87ce2a04 DE |
4989 | debug_printf ("Client wants LWP %ld to stop. " |
4990 | "Making sure it has a SIGSTOP pending\n", | |
d86d4aaf | 4991 | lwpid_of (thread)); |
02fc4de7 PA |
4992 | |
4993 | send_sigstop (lwp); | |
4994 | } | |
4995 | ||
863d01bd PA |
4996 | if (thread->last_resume_kind == resume_step) |
4997 | { | |
4998 | if (debug_threads) | |
4999 | debug_printf (" stepping LWP %ld, client wants it stepping\n", | |
5000 | lwpid_of (thread)); | |
8901d193 | 5001 | |
3b9a79ef | 5002 | /* If resume_step is requested by GDB, install single-step |
8901d193 | 5003 | breakpoints when the thread is about to be actually resumed if |
3b9a79ef | 5004 | the single-step breakpoints weren't removed. */ |
7582c77c | 5005 | if (supports_software_single_step () |
3b9a79ef | 5006 | && !has_single_step_breakpoints (thread)) |
8901d193 YQ |
5007 | install_software_single_step_breakpoints (lwp); |
5008 | ||
5009 | step = maybe_hw_step (thread); | |
863d01bd PA |
5010 | } |
5011 | else if (lwp->bp_reinsert != 0) | |
5012 | { | |
5013 | if (debug_threads) | |
5014 | debug_printf (" stepping LWP %ld, reinsert set\n", | |
5015 | lwpid_of (thread)); | |
f79b145d YQ |
5016 | |
5017 | step = maybe_hw_step (thread); | |
863d01bd PA |
5018 | } |
5019 | else | |
5020 | step = 0; | |
5021 | ||
df95181f | 5022 | resume_one_lwp (lwp, step, 0, NULL); |
7984d532 PA |
5023 | } |
5024 | ||
df95181f TBA |
5025 | void |
5026 | linux_process_target::unsuspend_and_proceed_one_lwp (thread_info *thread, | |
5027 | lwp_info *except) | |
7984d532 | 5028 | { |
d86d4aaf | 5029 | struct lwp_info *lwp = get_thread_lwp (thread); |
7984d532 PA |
5030 | |
5031 | if (lwp == except) | |
e2b44075 | 5032 | return; |
7984d532 | 5033 | |
863d01bd | 5034 | lwp_suspended_decr (lwp); |
7984d532 | 5035 | |
e2b44075 | 5036 | proceed_one_lwp (thread, except); |
d50171e4 PA |
5037 | } |
5038 | ||
d16f3f6c TBA |
5039 | void |
5040 | linux_process_target::proceed_all_lwps () | |
d50171e4 | 5041 | { |
d86d4aaf | 5042 | struct thread_info *need_step_over; |
d50171e4 PA |
5043 | |
5044 | /* If there is a thread which would otherwise be resumed, which is | |
5045 | stopped at a breakpoint that needs stepping over, then don't | |
5046 | resume any threads - have it step over the breakpoint with all | |
5047 | other threads stopped, then resume all threads again. */ | |
5048 | ||
bf9ae9d8 | 5049 | if (low_supports_breakpoints ()) |
d50171e4 | 5050 | { |
df95181f TBA |
5051 | need_step_over = find_thread ([this] (thread_info *thread) |
5052 | { | |
5053 | return thread_needs_step_over (thread); | |
5054 | }); | |
d50171e4 PA |
5055 | |
5056 | if (need_step_over != NULL) | |
5057 | { | |
5058 | if (debug_threads) | |
87ce2a04 DE |
5059 | debug_printf ("proceed_all_lwps: found " |
5060 | "thread %ld needing a step-over\n", | |
5061 | lwpid_of (need_step_over)); | |
d50171e4 | 5062 | |
d86d4aaf | 5063 | start_step_over (get_thread_lwp (need_step_over)); |
d50171e4 PA |
5064 | return; |
5065 | } | |
5066 | } | |
5544ad89 | 5067 | |
d50171e4 | 5068 | if (debug_threads) |
87ce2a04 | 5069 | debug_printf ("Proceeding, no step-over needed\n"); |
d50171e4 | 5070 | |
df95181f | 5071 | for_each_thread ([this] (thread_info *thread) |
e2b44075 SM |
5072 | { |
5073 | proceed_one_lwp (thread, NULL); | |
5074 | }); | |
d50171e4 PA |
5075 | } |
5076 | ||
d16f3f6c TBA |
5077 | void |
5078 | linux_process_target::unstop_all_lwps (int unsuspend, lwp_info *except) | |
d50171e4 | 5079 | { |
5544ad89 DJ |
5080 | if (debug_threads) |
5081 | { | |
87ce2a04 | 5082 | debug_enter (); |
d50171e4 | 5083 | if (except) |
87ce2a04 | 5084 | debug_printf ("unstopping all lwps, except=(LWP %ld)\n", |
d86d4aaf | 5085 | lwpid_of (get_lwp_thread (except))); |
5544ad89 | 5086 | else |
87ce2a04 | 5087 | debug_printf ("unstopping all lwps\n"); |
5544ad89 DJ |
5088 | } |
5089 | ||
7984d532 | 5090 | if (unsuspend) |
e2b44075 SM |
5091 | for_each_thread ([&] (thread_info *thread) |
5092 | { | |
5093 | unsuspend_and_proceed_one_lwp (thread, except); | |
5094 | }); | |
7984d532 | 5095 | else |
e2b44075 SM |
5096 | for_each_thread ([&] (thread_info *thread) |
5097 | { | |
5098 | proceed_one_lwp (thread, except); | |
5099 | }); | |
87ce2a04 DE |
5100 | |
5101 | if (debug_threads) | |
5102 | { | |
5103 | debug_printf ("unstop_all_lwps done\n"); | |
5104 | debug_exit (); | |
5105 | } | |
0d62e5e8 DJ |
5106 | } |
5107 | ||
58caa3dc DJ |
5108 | |
5109 | #ifdef HAVE_LINUX_REGSETS | |
5110 | ||
1faeff08 MR |
5111 | #define use_linux_regsets 1 |
5112 | ||
030031ee PA |
5113 | /* Returns true if REGSET has been disabled. */ |
5114 | ||
5115 | static int | |
5116 | regset_disabled (struct regsets_info *info, struct regset_info *regset) | |
5117 | { | |
5118 | return (info->disabled_regsets != NULL | |
5119 | && info->disabled_regsets[regset - info->regsets]); | |
5120 | } | |
5121 | ||
5122 | /* Disable REGSET. */ | |
5123 | ||
5124 | static void | |
5125 | disable_regset (struct regsets_info *info, struct regset_info *regset) | |
5126 | { | |
5127 | int dr_offset; | |
5128 | ||
5129 | dr_offset = regset - info->regsets; | |
5130 | if (info->disabled_regsets == NULL) | |
224c3ddb | 5131 | info->disabled_regsets = (char *) xcalloc (1, info->num_regsets); |
030031ee PA |
5132 | info->disabled_regsets[dr_offset] = 1; |
5133 | } | |
5134 | ||
58caa3dc | 5135 | static int |
3aee8918 PA |
5136 | regsets_fetch_inferior_registers (struct regsets_info *regsets_info, |
5137 | struct regcache *regcache) | |
58caa3dc DJ |
5138 | { |
5139 | struct regset_info *regset; | |
e9d25b98 | 5140 | int saw_general_regs = 0; |
95954743 | 5141 | int pid; |
1570b33e | 5142 | struct iovec iov; |
58caa3dc | 5143 | |
0bfdf32f | 5144 | pid = lwpid_of (current_thread); |
28eef672 | 5145 | for (regset = regsets_info->regsets; regset->size >= 0; regset++) |
58caa3dc | 5146 | { |
1570b33e L |
5147 | void *buf, *data; |
5148 | int nt_type, res; | |
58caa3dc | 5149 | |
030031ee | 5150 | if (regset->size == 0 || regset_disabled (regsets_info, regset)) |
28eef672 | 5151 | continue; |
58caa3dc | 5152 | |
bca929d3 | 5153 | buf = xmalloc (regset->size); |
1570b33e L |
5154 | |
5155 | nt_type = regset->nt_type; | |
5156 | if (nt_type) | |
5157 | { | |
5158 | iov.iov_base = buf; | |
5159 | iov.iov_len = regset->size; | |
5160 | data = (void *) &iov; | |
5161 | } | |
5162 | else | |
5163 | data = buf; | |
5164 | ||
dfb64f85 | 5165 | #ifndef __sparc__ |
f15f9948 | 5166 | res = ptrace (regset->get_request, pid, |
b8e1b30e | 5167 | (PTRACE_TYPE_ARG3) (long) nt_type, data); |
dfb64f85 | 5168 | #else |
1570b33e | 5169 | res = ptrace (regset->get_request, pid, data, nt_type); |
dfb64f85 | 5170 | #endif |
58caa3dc DJ |
5171 | if (res < 0) |
5172 | { | |
1ef53e6b AH |
5173 | if (errno == EIO |
5174 | || (errno == EINVAL && regset->type == OPTIONAL_REGS)) | |
58caa3dc | 5175 | { |
1ef53e6b AH |
5176 | /* If we get EIO on a regset, or an EINVAL and the regset is |
5177 | optional, do not try it again for this process mode. */ | |
030031ee | 5178 | disable_regset (regsets_info, regset); |
58caa3dc | 5179 | } |
e5a9158d AA |
5180 | else if (errno == ENODATA) |
5181 | { | |
5182 | /* ENODATA may be returned if the regset is currently | |
5183 | not "active". This can happen in normal operation, | |
5184 | so suppress the warning in this case. */ | |
5185 | } | |
fcd4a73d YQ |
5186 | else if (errno == ESRCH) |
5187 | { | |
5188 | /* At this point, ESRCH should mean the process is | |
5189 | already gone, in which case we simply ignore attempts | |
5190 | to read its registers. */ | |
5191 | } | |
58caa3dc DJ |
5192 | else |
5193 | { | |
0d62e5e8 | 5194 | char s[256]; |
95954743 PA |
5195 | sprintf (s, "ptrace(regsets_fetch_inferior_registers) PID=%d", |
5196 | pid); | |
0d62e5e8 | 5197 | perror (s); |
58caa3dc DJ |
5198 | } |
5199 | } | |
098dbe61 AA |
5200 | else |
5201 | { | |
5202 | if (regset->type == GENERAL_REGS) | |
5203 | saw_general_regs = 1; | |
5204 | regset->store_function (regcache, buf); | |
5205 | } | |
fdeb2a12 | 5206 | free (buf); |
58caa3dc | 5207 | } |
e9d25b98 DJ |
5208 | if (saw_general_regs) |
5209 | return 0; | |
5210 | else | |
5211 | return 1; | |
58caa3dc DJ |
5212 | } |
5213 | ||
5214 | static int | |
3aee8918 PA |
5215 | regsets_store_inferior_registers (struct regsets_info *regsets_info, |
5216 | struct regcache *regcache) | |
58caa3dc DJ |
5217 | { |
5218 | struct regset_info *regset; | |
e9d25b98 | 5219 | int saw_general_regs = 0; |
95954743 | 5220 | int pid; |
1570b33e | 5221 | struct iovec iov; |
58caa3dc | 5222 | |
0bfdf32f | 5223 | pid = lwpid_of (current_thread); |
28eef672 | 5224 | for (regset = regsets_info->regsets; regset->size >= 0; regset++) |
58caa3dc | 5225 | { |
1570b33e L |
5226 | void *buf, *data; |
5227 | int nt_type, res; | |
58caa3dc | 5228 | |
feea5f36 AA |
5229 | if (regset->size == 0 || regset_disabled (regsets_info, regset) |
5230 | || regset->fill_function == NULL) | |
28eef672 | 5231 | continue; |
58caa3dc | 5232 | |
bca929d3 | 5233 | buf = xmalloc (regset->size); |
545587ee DJ |
5234 | |
5235 | /* First fill the buffer with the current register set contents, | |
5236 | in case there are any items in the kernel's regset that are | |
5237 | not in gdbserver's regcache. */ | |
1570b33e L |
5238 | |
5239 | nt_type = regset->nt_type; | |
5240 | if (nt_type) | |
5241 | { | |
5242 | iov.iov_base = buf; | |
5243 | iov.iov_len = regset->size; | |
5244 | data = (void *) &iov; | |
5245 | } | |
5246 | else | |
5247 | data = buf; | |
5248 | ||
dfb64f85 | 5249 | #ifndef __sparc__ |
f15f9948 | 5250 | res = ptrace (regset->get_request, pid, |
b8e1b30e | 5251 | (PTRACE_TYPE_ARG3) (long) nt_type, data); |
dfb64f85 | 5252 | #else |
689cc2ae | 5253 | res = ptrace (regset->get_request, pid, data, nt_type); |
dfb64f85 | 5254 | #endif |
545587ee DJ |
5255 | |
5256 | if (res == 0) | |
5257 | { | |
5258 | /* Then overlay our cached registers on that. */ | |
442ea881 | 5259 | regset->fill_function (regcache, buf); |
545587ee DJ |
5260 | |
5261 | /* Only now do we write the register set. */ | |
dfb64f85 | 5262 | #ifndef __sparc__ |
f15f9948 | 5263 | res = ptrace (regset->set_request, pid, |
b8e1b30e | 5264 | (PTRACE_TYPE_ARG3) (long) nt_type, data); |
dfb64f85 | 5265 | #else |
1570b33e | 5266 | res = ptrace (regset->set_request, pid, data, nt_type); |
dfb64f85 | 5267 | #endif |
545587ee DJ |
5268 | } |
5269 | ||
58caa3dc DJ |
5270 | if (res < 0) |
5271 | { | |
1ef53e6b AH |
5272 | if (errno == EIO |
5273 | || (errno == EINVAL && regset->type == OPTIONAL_REGS)) | |
58caa3dc | 5274 | { |
1ef53e6b AH |
5275 | /* If we get EIO on a regset, or an EINVAL and the regset is |
5276 | optional, do not try it again for this process mode. */ | |
030031ee | 5277 | disable_regset (regsets_info, regset); |
58caa3dc | 5278 | } |
3221518c UW |
5279 | else if (errno == ESRCH) |
5280 | { | |
1b3f6016 PA |
5281 | /* At this point, ESRCH should mean the process is |
5282 | already gone, in which case we simply ignore attempts | |
5283 | to change its registers. See also the related | |
df95181f | 5284 | comment in resume_one_lwp. */ |
fdeb2a12 | 5285 | free (buf); |
3221518c UW |
5286 | return 0; |
5287 | } | |
58caa3dc DJ |
5288 | else |
5289 | { | |
ce3a066d | 5290 | perror ("Warning: ptrace(regsets_store_inferior_registers)"); |
58caa3dc DJ |
5291 | } |
5292 | } | |
e9d25b98 DJ |
5293 | else if (regset->type == GENERAL_REGS) |
5294 | saw_general_regs = 1; | |
09ec9b38 | 5295 | free (buf); |
58caa3dc | 5296 | } |
e9d25b98 DJ |
5297 | if (saw_general_regs) |
5298 | return 0; | |
5299 | else | |
5300 | return 1; | |
58caa3dc DJ |
5301 | } |
5302 | ||
1faeff08 | 5303 | #else /* !HAVE_LINUX_REGSETS */ |
58caa3dc | 5304 | |
1faeff08 | 5305 | #define use_linux_regsets 0 |
3aee8918 PA |
5306 | #define regsets_fetch_inferior_registers(regsets_info, regcache) 1 |
5307 | #define regsets_store_inferior_registers(regsets_info, regcache) 1 | |
58caa3dc | 5308 | |
58caa3dc | 5309 | #endif |
1faeff08 MR |
5310 | |
5311 | /* Return 1 if register REGNO is supported by one of the regset ptrace | |
5312 | calls or 0 if it has to be transferred individually. */ | |
5313 | ||
5314 | static int | |
3aee8918 | 5315 | linux_register_in_regsets (const struct regs_info *regs_info, int regno) |
1faeff08 MR |
5316 | { |
5317 | unsigned char mask = 1 << (regno % 8); | |
5318 | size_t index = regno / 8; | |
5319 | ||
5320 | return (use_linux_regsets | |
3aee8918 PA |
5321 | && (regs_info->regset_bitmap == NULL |
5322 | || (regs_info->regset_bitmap[index] & mask) != 0)); | |
1faeff08 MR |
5323 | } |
5324 | ||
58caa3dc | 5325 | #ifdef HAVE_LINUX_USRREGS |
1faeff08 | 5326 | |
5b3da067 | 5327 | static int |
3aee8918 | 5328 | register_addr (const struct usrregs_info *usrregs, int regnum) |
1faeff08 MR |
5329 | { |
5330 | int addr; | |
5331 | ||
3aee8918 | 5332 | if (regnum < 0 || regnum >= usrregs->num_regs) |
1faeff08 MR |
5333 | error ("Invalid register number %d.", regnum); |
5334 | ||
3aee8918 | 5335 | addr = usrregs->regmap[regnum]; |
1faeff08 MR |
5336 | |
5337 | return addr; | |
5338 | } | |
5339 | ||
daca57a7 TBA |
5340 | |
5341 | void | |
5342 | linux_process_target::fetch_register (const usrregs_info *usrregs, | |
5343 | regcache *regcache, int regno) | |
1faeff08 MR |
5344 | { |
5345 | CORE_ADDR regaddr; | |
5346 | int i, size; | |
5347 | char *buf; | |
5348 | int pid; | |
5349 | ||
3aee8918 | 5350 | if (regno >= usrregs->num_regs) |
1faeff08 | 5351 | return; |
daca57a7 | 5352 | if (low_cannot_fetch_register (regno)) |
1faeff08 MR |
5353 | return; |
5354 | ||
3aee8918 | 5355 | regaddr = register_addr (usrregs, regno); |
1faeff08 MR |
5356 | if (regaddr == -1) |
5357 | return; | |
5358 | ||
3aee8918 PA |
5359 | size = ((register_size (regcache->tdesc, regno) |
5360 | + sizeof (PTRACE_XFER_TYPE) - 1) | |
1faeff08 | 5361 | & -sizeof (PTRACE_XFER_TYPE)); |
224c3ddb | 5362 | buf = (char *) alloca (size); |
1faeff08 | 5363 | |
0bfdf32f | 5364 | pid = lwpid_of (current_thread); |
1faeff08 MR |
5365 | for (i = 0; i < size; i += sizeof (PTRACE_XFER_TYPE)) |
5366 | { | |
5367 | errno = 0; | |
5368 | *(PTRACE_XFER_TYPE *) (buf + i) = | |
5369 | ptrace (PTRACE_PEEKUSER, pid, | |
5370 | /* Coerce to a uintptr_t first to avoid potential gcc warning | |
5371 | of coercing an 8 byte integer to a 4 byte pointer. */ | |
b8e1b30e | 5372 | (PTRACE_TYPE_ARG3) (uintptr_t) regaddr, (PTRACE_TYPE_ARG4) 0); |
1faeff08 MR |
5373 | regaddr += sizeof (PTRACE_XFER_TYPE); |
5374 | if (errno != 0) | |
9a70f35c YQ |
5375 | { |
5376 | /* Mark register REGNO unavailable. */ | |
5377 | supply_register (regcache, regno, NULL); | |
5378 | return; | |
5379 | } | |
1faeff08 MR |
5380 | } |
5381 | ||
b35db733 | 5382 | low_supply_ptrace_register (regcache, regno, buf); |
1faeff08 MR |
5383 | } |
5384 | ||
daca57a7 TBA |
5385 | void |
5386 | linux_process_target::store_register (const usrregs_info *usrregs, | |
5387 | regcache *regcache, int regno) | |
1faeff08 MR |
5388 | { |
5389 | CORE_ADDR regaddr; | |
5390 | int i, size; | |
5391 | char *buf; | |
5392 | int pid; | |
5393 | ||
3aee8918 | 5394 | if (regno >= usrregs->num_regs) |
1faeff08 | 5395 | return; |
daca57a7 | 5396 | if (low_cannot_store_register (regno)) |
1faeff08 MR |
5397 | return; |
5398 | ||
3aee8918 | 5399 | regaddr = register_addr (usrregs, regno); |
1faeff08 MR |
5400 | if (regaddr == -1) |
5401 | return; | |
5402 | ||
3aee8918 PA |
5403 | size = ((register_size (regcache->tdesc, regno) |
5404 | + sizeof (PTRACE_XFER_TYPE) - 1) | |
1faeff08 | 5405 | & -sizeof (PTRACE_XFER_TYPE)); |
224c3ddb | 5406 | buf = (char *) alloca (size); |
1faeff08 MR |
5407 | memset (buf, 0, size); |
5408 | ||
b35db733 | 5409 | low_collect_ptrace_register (regcache, regno, buf); |
1faeff08 | 5410 | |
0bfdf32f | 5411 | pid = lwpid_of (current_thread); |
1faeff08 MR |
5412 | for (i = 0; i < size; i += sizeof (PTRACE_XFER_TYPE)) |
5413 | { | |
5414 | errno = 0; | |
5415 | ptrace (PTRACE_POKEUSER, pid, | |
5416 | /* Coerce to a uintptr_t first to avoid potential gcc warning | |
5417 | about coercing an 8 byte integer to a 4 byte pointer. */ | |
b8e1b30e LM |
5418 | (PTRACE_TYPE_ARG3) (uintptr_t) regaddr, |
5419 | (PTRACE_TYPE_ARG4) *(PTRACE_XFER_TYPE *) (buf + i)); | |
1faeff08 MR |
5420 | if (errno != 0) |
5421 | { | |
5422 | /* At this point, ESRCH should mean the process is | |
5423 | already gone, in which case we simply ignore attempts | |
5424 | to change its registers. See also the related | |
df95181f | 5425 | comment in resume_one_lwp. */ |
1faeff08 MR |
5426 | if (errno == ESRCH) |
5427 | return; | |
5428 | ||
daca57a7 TBA |
5429 | |
5430 | if (!low_cannot_store_register (regno)) | |
6d91ce9a | 5431 | error ("writing register %d: %s", regno, safe_strerror (errno)); |
1faeff08 MR |
5432 | } |
5433 | regaddr += sizeof (PTRACE_XFER_TYPE); | |
5434 | } | |
5435 | } | |
daca57a7 | 5436 | #endif /* HAVE_LINUX_USRREGS */ |
1faeff08 | 5437 | |
b35db733 TBA |
5438 | void |
5439 | linux_process_target::low_collect_ptrace_register (regcache *regcache, | |
5440 | int regno, char *buf) | |
5441 | { | |
5442 | collect_register (regcache, regno, buf); | |
5443 | } | |
5444 | ||
5445 | void | |
5446 | linux_process_target::low_supply_ptrace_register (regcache *regcache, | |
5447 | int regno, const char *buf) | |
5448 | { | |
5449 | supply_register (regcache, regno, buf); | |
5450 | } | |
5451 | ||
daca57a7 TBA |
5452 | void |
5453 | linux_process_target::usr_fetch_inferior_registers (const regs_info *regs_info, | |
5454 | regcache *regcache, | |
5455 | int regno, int all) | |
1faeff08 | 5456 | { |
daca57a7 | 5457 | #ifdef HAVE_LINUX_USRREGS |
3aee8918 PA |
5458 | struct usrregs_info *usr = regs_info->usrregs; |
5459 | ||
1faeff08 MR |
5460 | if (regno == -1) |
5461 | { | |
3aee8918 PA |
5462 | for (regno = 0; regno < usr->num_regs; regno++) |
5463 | if (all || !linux_register_in_regsets (regs_info, regno)) | |
5464 | fetch_register (usr, regcache, regno); | |
1faeff08 MR |
5465 | } |
5466 | else | |
3aee8918 | 5467 | fetch_register (usr, regcache, regno); |
daca57a7 | 5468 | #endif |
1faeff08 MR |
5469 | } |
5470 | ||
daca57a7 TBA |
5471 | void |
5472 | linux_process_target::usr_store_inferior_registers (const regs_info *regs_info, | |
5473 | regcache *regcache, | |
5474 | int regno, int all) | |
1faeff08 | 5475 | { |
daca57a7 | 5476 | #ifdef HAVE_LINUX_USRREGS |
3aee8918 PA |
5477 | struct usrregs_info *usr = regs_info->usrregs; |
5478 | ||
1faeff08 MR |
5479 | if (regno == -1) |
5480 | { | |
3aee8918 PA |
5481 | for (regno = 0; regno < usr->num_regs; regno++) |
5482 | if (all || !linux_register_in_regsets (regs_info, regno)) | |
5483 | store_register (usr, regcache, regno); | |
1faeff08 MR |
5484 | } |
5485 | else | |
3aee8918 | 5486 | store_register (usr, regcache, regno); |
58caa3dc | 5487 | #endif |
daca57a7 | 5488 | } |
1faeff08 | 5489 | |
a5a4d4cd TBA |
5490 | void |
5491 | linux_process_target::fetch_registers (regcache *regcache, int regno) | |
1faeff08 MR |
5492 | { |
5493 | int use_regsets; | |
5494 | int all = 0; | |
aa8d21c9 | 5495 | const regs_info *regs_info = get_regs_info (); |
1faeff08 MR |
5496 | |
5497 | if (regno == -1) | |
5498 | { | |
bd70b1f2 | 5499 | if (regs_info->usrregs != NULL) |
3aee8918 | 5500 | for (regno = 0; regno < regs_info->usrregs->num_regs; regno++) |
bd70b1f2 | 5501 | low_fetch_register (regcache, regno); |
c14dfd32 | 5502 | |
3aee8918 PA |
5503 | all = regsets_fetch_inferior_registers (regs_info->regsets_info, regcache); |
5504 | if (regs_info->usrregs != NULL) | |
5505 | usr_fetch_inferior_registers (regs_info, regcache, -1, all); | |
1faeff08 MR |
5506 | } |
5507 | else | |
5508 | { | |
bd70b1f2 | 5509 | if (low_fetch_register (regcache, regno)) |
c14dfd32 PA |
5510 | return; |
5511 | ||
3aee8918 | 5512 | use_regsets = linux_register_in_regsets (regs_info, regno); |
1faeff08 | 5513 | if (use_regsets) |
3aee8918 PA |
5514 | all = regsets_fetch_inferior_registers (regs_info->regsets_info, |
5515 | regcache); | |
5516 | if ((!use_regsets || all) && regs_info->usrregs != NULL) | |
5517 | usr_fetch_inferior_registers (regs_info, regcache, regno, 1); | |
1faeff08 | 5518 | } |
58caa3dc DJ |
5519 | } |
5520 | ||
a5a4d4cd TBA |
5521 | void |
5522 | linux_process_target::store_registers (regcache *regcache, int regno) | |
58caa3dc | 5523 | { |
1faeff08 MR |
5524 | int use_regsets; |
5525 | int all = 0; | |
aa8d21c9 | 5526 | const regs_info *regs_info = get_regs_info (); |
1faeff08 MR |
5527 | |
5528 | if (regno == -1) | |
5529 | { | |
3aee8918 PA |
5530 | all = regsets_store_inferior_registers (regs_info->regsets_info, |
5531 | regcache); | |
5532 | if (regs_info->usrregs != NULL) | |
5533 | usr_store_inferior_registers (regs_info, regcache, regno, all); | |
1faeff08 MR |
5534 | } |
5535 | else | |
5536 | { | |
3aee8918 | 5537 | use_regsets = linux_register_in_regsets (regs_info, regno); |
1faeff08 | 5538 | if (use_regsets) |
3aee8918 PA |
5539 | all = regsets_store_inferior_registers (regs_info->regsets_info, |
5540 | regcache); | |
5541 | if ((!use_regsets || all) && regs_info->usrregs != NULL) | |
5542 | usr_store_inferior_registers (regs_info, regcache, regno, 1); | |
1faeff08 | 5543 | } |
58caa3dc DJ |
5544 | } |
5545 | ||
bd70b1f2 TBA |
5546 | bool |
5547 | linux_process_target::low_fetch_register (regcache *regcache, int regno) | |
5548 | { | |
5549 | return false; | |
5550 | } | |
da6d8c04 | 5551 | |
e2558df3 | 5552 | /* A wrapper for the read_memory target op. */ |
da6d8c04 | 5553 | |
c3e735a6 | 5554 | static int |
f450004a | 5555 | linux_read_memory (CORE_ADDR memaddr, unsigned char *myaddr, int len) |
e2558df3 | 5556 | { |
52405d85 | 5557 | return the_target->read_memory (memaddr, myaddr, len); |
e2558df3 TBA |
5558 | } |
5559 | ||
5560 | /* Copy LEN bytes from inferior's memory starting at MEMADDR | |
5561 | to debugger memory starting at MYADDR. */ | |
5562 | ||
5563 | int | |
5564 | linux_process_target::read_memory (CORE_ADDR memaddr, | |
5565 | unsigned char *myaddr, int len) | |
da6d8c04 | 5566 | { |
0bfdf32f | 5567 | int pid = lwpid_of (current_thread); |
ae3e2ccf SM |
5568 | PTRACE_XFER_TYPE *buffer; |
5569 | CORE_ADDR addr; | |
5570 | int count; | |
4934b29e | 5571 | char filename[64]; |
ae3e2ccf | 5572 | int i; |
4934b29e | 5573 | int ret; |
fd462a61 | 5574 | int fd; |
fd462a61 DJ |
5575 | |
5576 | /* Try using /proc. Don't bother for one word. */ | |
5577 | if (len >= 3 * sizeof (long)) | |
5578 | { | |
4934b29e MR |
5579 | int bytes; |
5580 | ||
fd462a61 DJ |
5581 | /* We could keep this file open and cache it - possibly one per |
5582 | thread. That requires some juggling, but is even faster. */ | |
95954743 | 5583 | sprintf (filename, "/proc/%d/mem", pid); |
fd462a61 DJ |
5584 | fd = open (filename, O_RDONLY | O_LARGEFILE); |
5585 | if (fd == -1) | |
5586 | goto no_proc; | |
5587 | ||
5588 | /* If pread64 is available, use it. It's faster if the kernel | |
5589 | supports it (only one syscall), and it's 64-bit safe even on | |
5590 | 32-bit platforms (for instance, SPARC debugging a SPARC64 | |
5591 | application). */ | |
5592 | #ifdef HAVE_PREAD64 | |
4934b29e | 5593 | bytes = pread64 (fd, myaddr, len, memaddr); |
fd462a61 | 5594 | #else |
4934b29e MR |
5595 | bytes = -1; |
5596 | if (lseek (fd, memaddr, SEEK_SET) != -1) | |
5597 | bytes = read (fd, myaddr, len); | |
fd462a61 | 5598 | #endif |
fd462a61 DJ |
5599 | |
5600 | close (fd); | |
4934b29e MR |
5601 | if (bytes == len) |
5602 | return 0; | |
5603 | ||
5604 | /* Some data was read, we'll try to get the rest with ptrace. */ | |
5605 | if (bytes > 0) | |
5606 | { | |
5607 | memaddr += bytes; | |
5608 | myaddr += bytes; | |
5609 | len -= bytes; | |
5610 | } | |
fd462a61 | 5611 | } |
da6d8c04 | 5612 | |
fd462a61 | 5613 | no_proc: |
4934b29e MR |
5614 | /* Round starting address down to longword boundary. */ |
5615 | addr = memaddr & -(CORE_ADDR) sizeof (PTRACE_XFER_TYPE); | |
5616 | /* Round ending address up; get number of longwords that makes. */ | |
5617 | count = ((((memaddr + len) - addr) + sizeof (PTRACE_XFER_TYPE) - 1) | |
5618 | / sizeof (PTRACE_XFER_TYPE)); | |
5619 | /* Allocate buffer of that many longwords. */ | |
8d749320 | 5620 | buffer = XALLOCAVEC (PTRACE_XFER_TYPE, count); |
4934b29e | 5621 | |
da6d8c04 | 5622 | /* Read all the longwords */ |
4934b29e | 5623 | errno = 0; |
da6d8c04 DJ |
5624 | for (i = 0; i < count; i++, addr += sizeof (PTRACE_XFER_TYPE)) |
5625 | { | |
14ce3065 DE |
5626 | /* Coerce the 3rd arg to a uintptr_t first to avoid potential gcc warning |
5627 | about coercing an 8 byte integer to a 4 byte pointer. */ | |
5628 | buffer[i] = ptrace (PTRACE_PEEKTEXT, pid, | |
b8e1b30e LM |
5629 | (PTRACE_TYPE_ARG3) (uintptr_t) addr, |
5630 | (PTRACE_TYPE_ARG4) 0); | |
c3e735a6 | 5631 | if (errno) |
4934b29e | 5632 | break; |
da6d8c04 | 5633 | } |
4934b29e | 5634 | ret = errno; |
da6d8c04 DJ |
5635 | |
5636 | /* Copy appropriate bytes out of the buffer. */ | |
8d409d16 MR |
5637 | if (i > 0) |
5638 | { | |
5639 | i *= sizeof (PTRACE_XFER_TYPE); | |
5640 | i -= memaddr & (sizeof (PTRACE_XFER_TYPE) - 1); | |
5641 | memcpy (myaddr, | |
5642 | (char *) buffer + (memaddr & (sizeof (PTRACE_XFER_TYPE) - 1)), | |
5643 | i < len ? i : len); | |
5644 | } | |
c3e735a6 | 5645 | |
4934b29e | 5646 | return ret; |
da6d8c04 DJ |
5647 | } |
5648 | ||
93ae6fdc PA |
5649 | /* Copy LEN bytes of data from debugger memory at MYADDR to inferior's |
5650 | memory at MEMADDR. On failure (cannot write to the inferior) | |
f0ae6fc3 | 5651 | returns the value of errno. Always succeeds if LEN is zero. */ |
da6d8c04 | 5652 | |
e2558df3 TBA |
5653 | int |
5654 | linux_process_target::write_memory (CORE_ADDR memaddr, | |
5655 | const unsigned char *myaddr, int len) | |
da6d8c04 | 5656 | { |
ae3e2ccf | 5657 | int i; |
da6d8c04 | 5658 | /* Round starting address down to longword boundary. */ |
ae3e2ccf | 5659 | CORE_ADDR addr = memaddr & -(CORE_ADDR) sizeof (PTRACE_XFER_TYPE); |
da6d8c04 | 5660 | /* Round ending address up; get number of longwords that makes. */ |
ae3e2ccf | 5661 | int count |
493e2a69 MS |
5662 | = (((memaddr + len) - addr) + sizeof (PTRACE_XFER_TYPE) - 1) |
5663 | / sizeof (PTRACE_XFER_TYPE); | |
5664 | ||
da6d8c04 | 5665 | /* Allocate buffer of that many longwords. */ |
ae3e2ccf | 5666 | PTRACE_XFER_TYPE *buffer = XALLOCAVEC (PTRACE_XFER_TYPE, count); |
493e2a69 | 5667 | |
0bfdf32f | 5668 | int pid = lwpid_of (current_thread); |
da6d8c04 | 5669 | |
f0ae6fc3 PA |
5670 | if (len == 0) |
5671 | { | |
5672 | /* Zero length write always succeeds. */ | |
5673 | return 0; | |
5674 | } | |
5675 | ||
0d62e5e8 DJ |
5676 | if (debug_threads) |
5677 | { | |
58d6951d | 5678 | /* Dump up to four bytes. */ |
bf47e248 PA |
5679 | char str[4 * 2 + 1]; |
5680 | char *p = str; | |
5681 | int dump = len < 4 ? len : 4; | |
5682 | ||
5683 | for (i = 0; i < dump; i++) | |
5684 | { | |
5685 | sprintf (p, "%02x", myaddr[i]); | |
5686 | p += 2; | |
5687 | } | |
5688 | *p = '\0'; | |
5689 | ||
5690 | debug_printf ("Writing %s to 0x%08lx in process %d\n", | |
5691 | str, (long) memaddr, pid); | |
0d62e5e8 DJ |
5692 | } |
5693 | ||
da6d8c04 DJ |
5694 | /* Fill start and end extra bytes of buffer with existing memory data. */ |
5695 | ||
93ae6fdc | 5696 | errno = 0; |
14ce3065 DE |
5697 | /* Coerce the 3rd arg to a uintptr_t first to avoid potential gcc warning |
5698 | about coercing an 8 byte integer to a 4 byte pointer. */ | |
5699 | buffer[0] = ptrace (PTRACE_PEEKTEXT, pid, | |
b8e1b30e LM |
5700 | (PTRACE_TYPE_ARG3) (uintptr_t) addr, |
5701 | (PTRACE_TYPE_ARG4) 0); | |
93ae6fdc PA |
5702 | if (errno) |
5703 | return errno; | |
da6d8c04 DJ |
5704 | |
5705 | if (count > 1) | |
5706 | { | |
93ae6fdc | 5707 | errno = 0; |
da6d8c04 | 5708 | buffer[count - 1] |
95954743 | 5709 | = ptrace (PTRACE_PEEKTEXT, pid, |
14ce3065 DE |
5710 | /* Coerce to a uintptr_t first to avoid potential gcc warning |
5711 | about coercing an 8 byte integer to a 4 byte pointer. */ | |
b8e1b30e | 5712 | (PTRACE_TYPE_ARG3) (uintptr_t) (addr + (count - 1) |
14ce3065 | 5713 | * sizeof (PTRACE_XFER_TYPE)), |
b8e1b30e | 5714 | (PTRACE_TYPE_ARG4) 0); |
93ae6fdc PA |
5715 | if (errno) |
5716 | return errno; | |
da6d8c04 DJ |
5717 | } |
5718 | ||
93ae6fdc | 5719 | /* Copy data to be written over corresponding part of buffer. */ |
da6d8c04 | 5720 | |
493e2a69 MS |
5721 | memcpy ((char *) buffer + (memaddr & (sizeof (PTRACE_XFER_TYPE) - 1)), |
5722 | myaddr, len); | |
da6d8c04 DJ |
5723 | |
5724 | /* Write the entire buffer. */ | |
5725 | ||
5726 | for (i = 0; i < count; i++, addr += sizeof (PTRACE_XFER_TYPE)) | |
5727 | { | |
5728 | errno = 0; | |
14ce3065 DE |
5729 | ptrace (PTRACE_POKETEXT, pid, |
5730 | /* Coerce to a uintptr_t first to avoid potential gcc warning | |
5731 | about coercing an 8 byte integer to a 4 byte pointer. */ | |
b8e1b30e LM |
5732 | (PTRACE_TYPE_ARG3) (uintptr_t) addr, |
5733 | (PTRACE_TYPE_ARG4) buffer[i]); | |
da6d8c04 DJ |
5734 | if (errno) |
5735 | return errno; | |
5736 | } | |
5737 | ||
5738 | return 0; | |
5739 | } | |
2f2893d9 | 5740 | |
2a31c7aa TBA |
5741 | void |
5742 | linux_process_target::look_up_symbols () | |
2f2893d9 | 5743 | { |
0d62e5e8 | 5744 | #ifdef USE_THREAD_DB |
95954743 PA |
5745 | struct process_info *proc = current_process (); |
5746 | ||
fe978cb0 | 5747 | if (proc->priv->thread_db != NULL) |
0d62e5e8 DJ |
5748 | return; |
5749 | ||
9b4c5f87 | 5750 | thread_db_init (); |
0d62e5e8 DJ |
5751 | #endif |
5752 | } | |
5753 | ||
eb497a2a TBA |
5754 | void |
5755 | linux_process_target::request_interrupt () | |
e5379b03 | 5756 | { |
78708b7c PA |
5757 | /* Send a SIGINT to the process group. This acts just like the user |
5758 | typed a ^C on the controlling terminal. */ | |
eb497a2a | 5759 | ::kill (-signal_pid, SIGINT); |
e5379b03 DJ |
5760 | } |
5761 | ||
eac215cc TBA |
5762 | bool |
5763 | linux_process_target::supports_read_auxv () | |
5764 | { | |
5765 | return true; | |
5766 | } | |
5767 | ||
aa691b87 RM |
5768 | /* Copy LEN bytes from inferior's auxiliary vector starting at OFFSET |
5769 | to debugger memory starting at MYADDR. */ | |
5770 | ||
eac215cc TBA |
5771 | int |
5772 | linux_process_target::read_auxv (CORE_ADDR offset, unsigned char *myaddr, | |
5773 | unsigned int len) | |
aa691b87 RM |
5774 | { |
5775 | char filename[PATH_MAX]; | |
5776 | int fd, n; | |
0bfdf32f | 5777 | int pid = lwpid_of (current_thread); |
aa691b87 | 5778 | |
6cebaf6e | 5779 | xsnprintf (filename, sizeof filename, "/proc/%d/auxv", pid); |
aa691b87 RM |
5780 | |
5781 | fd = open (filename, O_RDONLY); | |
5782 | if (fd < 0) | |
5783 | return -1; | |
5784 | ||
5785 | if (offset != (CORE_ADDR) 0 | |
5786 | && lseek (fd, (off_t) offset, SEEK_SET) != (off_t) offset) | |
5787 | n = -1; | |
5788 | else | |
5789 | n = read (fd, myaddr, len); | |
5790 | ||
5791 | close (fd); | |
5792 | ||
5793 | return n; | |
5794 | } | |
5795 | ||
7e0bde70 TBA |
5796 | int |
5797 | linux_process_target::insert_point (enum raw_bkpt_type type, CORE_ADDR addr, | |
5798 | int size, raw_breakpoint *bp) | |
e013ee27 | 5799 | { |
c8f4bfdd YQ |
5800 | if (type == raw_bkpt_type_sw) |
5801 | return insert_memory_breakpoint (bp); | |
e013ee27 | 5802 | else |
9db9aa23 TBA |
5803 | return low_insert_point (type, addr, size, bp); |
5804 | } | |
5805 | ||
5806 | int | |
5807 | linux_process_target::low_insert_point (raw_bkpt_type type, CORE_ADDR addr, | |
5808 | int size, raw_breakpoint *bp) | |
5809 | { | |
5810 | /* Unsupported (see target.h). */ | |
5811 | return 1; | |
e013ee27 OF |
5812 | } |
5813 | ||
7e0bde70 TBA |
5814 | int |
5815 | linux_process_target::remove_point (enum raw_bkpt_type type, CORE_ADDR addr, | |
5816 | int size, raw_breakpoint *bp) | |
e013ee27 | 5817 | { |
c8f4bfdd YQ |
5818 | if (type == raw_bkpt_type_sw) |
5819 | return remove_memory_breakpoint (bp); | |
e013ee27 | 5820 | else |
9db9aa23 TBA |
5821 | return low_remove_point (type, addr, size, bp); |
5822 | } | |
5823 | ||
5824 | int | |
5825 | linux_process_target::low_remove_point (raw_bkpt_type type, CORE_ADDR addr, | |
5826 | int size, raw_breakpoint *bp) | |
5827 | { | |
5828 | /* Unsupported (see target.h). */ | |
5829 | return 1; | |
e013ee27 OF |
5830 | } |
5831 | ||
84320c4e | 5832 | /* Implement the stopped_by_sw_breakpoint target_ops |
3e572f71 PA |
5833 | method. */ |
5834 | ||
84320c4e TBA |
5835 | bool |
5836 | linux_process_target::stopped_by_sw_breakpoint () | |
3e572f71 PA |
5837 | { |
5838 | struct lwp_info *lwp = get_thread_lwp (current_thread); | |
5839 | ||
5840 | return (lwp->stop_reason == TARGET_STOPPED_BY_SW_BREAKPOINT); | |
5841 | } | |
5842 | ||
84320c4e | 5843 | /* Implement the supports_stopped_by_sw_breakpoint target_ops |
3e572f71 PA |
5844 | method. */ |
5845 | ||
84320c4e TBA |
5846 | bool |
5847 | linux_process_target::supports_stopped_by_sw_breakpoint () | |
3e572f71 PA |
5848 | { |
5849 | return USE_SIGTRAP_SIGINFO; | |
5850 | } | |
5851 | ||
93fe88b2 | 5852 | /* Implement the stopped_by_hw_breakpoint target_ops |
3e572f71 PA |
5853 | method. */ |
5854 | ||
93fe88b2 TBA |
5855 | bool |
5856 | linux_process_target::stopped_by_hw_breakpoint () | |
3e572f71 PA |
5857 | { |
5858 | struct lwp_info *lwp = get_thread_lwp (current_thread); | |
5859 | ||
5860 | return (lwp->stop_reason == TARGET_STOPPED_BY_HW_BREAKPOINT); | |
5861 | } | |
5862 | ||
93fe88b2 | 5863 | /* Implement the supports_stopped_by_hw_breakpoint target_ops |
3e572f71 PA |
5864 | method. */ |
5865 | ||
93fe88b2 TBA |
5866 | bool |
5867 | linux_process_target::supports_stopped_by_hw_breakpoint () | |
3e572f71 PA |
5868 | { |
5869 | return USE_SIGTRAP_SIGINFO; | |
5870 | } | |
5871 | ||
70b90b91 | 5872 | /* Implement the supports_hardware_single_step target_ops method. */ |
45614f15 | 5873 | |
22aa6223 TBA |
5874 | bool |
5875 | linux_process_target::supports_hardware_single_step () | |
45614f15 | 5876 | { |
b31cdfa6 | 5877 | return true; |
45614f15 YQ |
5878 | } |
5879 | ||
6eeb5c55 TBA |
5880 | bool |
5881 | linux_process_target::stopped_by_watchpoint () | |
e013ee27 | 5882 | { |
0bfdf32f | 5883 | struct lwp_info *lwp = get_thread_lwp (current_thread); |
c3adc08c | 5884 | |
15c66dd6 | 5885 | return lwp->stop_reason == TARGET_STOPPED_BY_WATCHPOINT; |
e013ee27 OF |
5886 | } |
5887 | ||
6eeb5c55 TBA |
5888 | CORE_ADDR |
5889 | linux_process_target::stopped_data_address () | |
e013ee27 | 5890 | { |
0bfdf32f | 5891 | struct lwp_info *lwp = get_thread_lwp (current_thread); |
c3adc08c PA |
5892 | |
5893 | return lwp->stopped_data_address; | |
e013ee27 OF |
5894 | } |
5895 | ||
db0dfaa0 LM |
5896 | /* This is only used for targets that define PT_TEXT_ADDR, |
5897 | PT_DATA_ADDR and PT_TEXT_END_ADDR. If those are not defined, supposedly | |
5898 | the target has different ways of acquiring this information, like | |
5899 | loadmaps. */ | |
52fb6437 | 5900 | |
5203ae1e TBA |
5901 | bool |
5902 | linux_process_target::supports_read_offsets () | |
5903 | { | |
5904 | #ifdef SUPPORTS_READ_OFFSETS | |
5905 | return true; | |
5906 | #else | |
5907 | return false; | |
5908 | #endif | |
5909 | } | |
5910 | ||
52fb6437 NS |
5911 | /* Under uClinux, programs are loaded at non-zero offsets, which we need |
5912 | to tell gdb about. */ | |
5913 | ||
5203ae1e TBA |
5914 | int |
5915 | linux_process_target::read_offsets (CORE_ADDR *text_p, CORE_ADDR *data_p) | |
52fb6437 | 5916 | { |
5203ae1e | 5917 | #ifdef SUPPORTS_READ_OFFSETS |
52fb6437 | 5918 | unsigned long text, text_end, data; |
62828379 | 5919 | int pid = lwpid_of (current_thread); |
52fb6437 NS |
5920 | |
5921 | errno = 0; | |
5922 | ||
b8e1b30e LM |
5923 | text = ptrace (PTRACE_PEEKUSER, pid, (PTRACE_TYPE_ARG3) PT_TEXT_ADDR, |
5924 | (PTRACE_TYPE_ARG4) 0); | |
5925 | text_end = ptrace (PTRACE_PEEKUSER, pid, (PTRACE_TYPE_ARG3) PT_TEXT_END_ADDR, | |
5926 | (PTRACE_TYPE_ARG4) 0); | |
5927 | data = ptrace (PTRACE_PEEKUSER, pid, (PTRACE_TYPE_ARG3) PT_DATA_ADDR, | |
5928 | (PTRACE_TYPE_ARG4) 0); | |
52fb6437 NS |
5929 | |
5930 | if (errno == 0) | |
5931 | { | |
5932 | /* Both text and data offsets produced at compile-time (and so | |
1b3f6016 PA |
5933 | used by gdb) are relative to the beginning of the program, |
5934 | with the data segment immediately following the text segment. | |
5935 | However, the actual runtime layout in memory may put the data | |
5936 | somewhere else, so when we send gdb a data base-address, we | |
5937 | use the real data base address and subtract the compile-time | |
5938 | data base-address from it (which is just the length of the | |
5939 | text segment). BSS immediately follows data in both | |
5940 | cases. */ | |
52fb6437 NS |
5941 | *text_p = text; |
5942 | *data_p = data - (text_end - text); | |
1b3f6016 | 5943 | |
52fb6437 NS |
5944 | return 1; |
5945 | } | |
5203ae1e TBA |
5946 | return 0; |
5947 | #else | |
5948 | gdb_assert_not_reached ("target op read_offsets not supported"); | |
52fb6437 | 5949 | #endif |
5203ae1e | 5950 | } |
52fb6437 | 5951 | |
6e3fd7e9 TBA |
5952 | bool |
5953 | linux_process_target::supports_get_tls_address () | |
5954 | { | |
5955 | #ifdef USE_THREAD_DB | |
5956 | return true; | |
5957 | #else | |
5958 | return false; | |
5959 | #endif | |
5960 | } | |
5961 | ||
5962 | int | |
5963 | linux_process_target::get_tls_address (thread_info *thread, | |
5964 | CORE_ADDR offset, | |
5965 | CORE_ADDR load_module, | |
5966 | CORE_ADDR *address) | |
5967 | { | |
5968 | #ifdef USE_THREAD_DB | |
5969 | return thread_db_get_tls_address (thread, offset, load_module, address); | |
5970 | #else | |
5971 | return -1; | |
5972 | #endif | |
5973 | } | |
5974 | ||
2d0795ee TBA |
5975 | bool |
5976 | linux_process_target::supports_qxfer_osdata () | |
5977 | { | |
5978 | return true; | |
5979 | } | |
5980 | ||
5981 | int | |
5982 | linux_process_target::qxfer_osdata (const char *annex, | |
5983 | unsigned char *readbuf, | |
5984 | unsigned const char *writebuf, | |
5985 | CORE_ADDR offset, int len) | |
07e059b5 | 5986 | { |
d26e3629 | 5987 | return linux_common_xfer_osdata (annex, readbuf, offset, len); |
07e059b5 VP |
5988 | } |
5989 | ||
cb63de7c TBA |
5990 | void |
5991 | linux_process_target::siginfo_fixup (siginfo_t *siginfo, | |
5992 | gdb_byte *inf_siginfo, int direction) | |
d0722149 | 5993 | { |
cb63de7c | 5994 | bool done = low_siginfo_fixup (siginfo, inf_siginfo, direction); |
d0722149 DE |
5995 | |
5996 | /* If there was no callback, or the callback didn't do anything, | |
5997 | then just do a straight memcpy. */ | |
5998 | if (!done) | |
5999 | { | |
6000 | if (direction == 1) | |
a5362b9a | 6001 | memcpy (siginfo, inf_siginfo, sizeof (siginfo_t)); |
d0722149 | 6002 | else |
a5362b9a | 6003 | memcpy (inf_siginfo, siginfo, sizeof (siginfo_t)); |
d0722149 DE |
6004 | } |
6005 | } | |
6006 | ||
cb63de7c TBA |
6007 | bool |
6008 | linux_process_target::low_siginfo_fixup (siginfo_t *native, gdb_byte *inf, | |
6009 | int direction) | |
6010 | { | |
6011 | return false; | |
6012 | } | |
6013 | ||
d7abedf7 TBA |
6014 | bool |
6015 | linux_process_target::supports_qxfer_siginfo () | |
6016 | { | |
6017 | return true; | |
6018 | } | |
6019 | ||
6020 | int | |
6021 | linux_process_target::qxfer_siginfo (const char *annex, | |
6022 | unsigned char *readbuf, | |
6023 | unsigned const char *writebuf, | |
6024 | CORE_ADDR offset, int len) | |
4aa995e1 | 6025 | { |
d0722149 | 6026 | int pid; |
a5362b9a | 6027 | siginfo_t siginfo; |
8adce034 | 6028 | gdb_byte inf_siginfo[sizeof (siginfo_t)]; |
4aa995e1 | 6029 | |
0bfdf32f | 6030 | if (current_thread == NULL) |
4aa995e1 PA |
6031 | return -1; |
6032 | ||
0bfdf32f | 6033 | pid = lwpid_of (current_thread); |
4aa995e1 PA |
6034 | |
6035 | if (debug_threads) | |
87ce2a04 DE |
6036 | debug_printf ("%s siginfo for lwp %d.\n", |
6037 | readbuf != NULL ? "Reading" : "Writing", | |
6038 | pid); | |
4aa995e1 | 6039 | |
0adea5f7 | 6040 | if (offset >= sizeof (siginfo)) |
4aa995e1 PA |
6041 | return -1; |
6042 | ||
b8e1b30e | 6043 | if (ptrace (PTRACE_GETSIGINFO, pid, (PTRACE_TYPE_ARG3) 0, &siginfo) != 0) |
4aa995e1 PA |
6044 | return -1; |
6045 | ||
d0722149 DE |
6046 | /* When GDBSERVER is built as a 64-bit application, ptrace writes into |
6047 | SIGINFO an object with 64-bit layout. Since debugging a 32-bit | |
6048 | inferior with a 64-bit GDBSERVER should look the same as debugging it | |
6049 | with a 32-bit GDBSERVER, we need to convert it. */ | |
6050 | siginfo_fixup (&siginfo, inf_siginfo, 0); | |
6051 | ||
4aa995e1 PA |
6052 | if (offset + len > sizeof (siginfo)) |
6053 | len = sizeof (siginfo) - offset; | |
6054 | ||
6055 | if (readbuf != NULL) | |
d0722149 | 6056 | memcpy (readbuf, inf_siginfo + offset, len); |
4aa995e1 PA |
6057 | else |
6058 | { | |
d0722149 DE |
6059 | memcpy (inf_siginfo + offset, writebuf, len); |
6060 | ||
6061 | /* Convert back to ptrace layout before flushing it out. */ | |
6062 | siginfo_fixup (&siginfo, inf_siginfo, 1); | |
6063 | ||
b8e1b30e | 6064 | if (ptrace (PTRACE_SETSIGINFO, pid, (PTRACE_TYPE_ARG3) 0, &siginfo) != 0) |
4aa995e1 PA |
6065 | return -1; |
6066 | } | |
6067 | ||
6068 | return len; | |
6069 | } | |
6070 | ||
bd99dc85 PA |
6071 | /* SIGCHLD handler that serves two purposes: In non-stop/async mode, |
6072 | so we notice when children change state; as the handler for the | |
6073 | sigsuspend in my_waitpid. */ | |
6074 | ||
6075 | static void | |
6076 | sigchld_handler (int signo) | |
6077 | { | |
6078 | int old_errno = errno; | |
6079 | ||
6080 | if (debug_threads) | |
e581f2b4 PA |
6081 | { |
6082 | do | |
6083 | { | |
a7e559cc AH |
6084 | /* Use the async signal safe debug function. */ |
6085 | if (debug_write ("sigchld_handler\n", | |
6086 | sizeof ("sigchld_handler\n") - 1) < 0) | |
e581f2b4 PA |
6087 | break; /* just ignore */ |
6088 | } while (0); | |
6089 | } | |
bd99dc85 PA |
6090 | |
6091 | if (target_is_async_p ()) | |
6092 | async_file_mark (); /* trigger a linux_wait */ | |
6093 | ||
6094 | errno = old_errno; | |
6095 | } | |
6096 | ||
0dc587d4 TBA |
6097 | bool |
6098 | linux_process_target::supports_non_stop () | |
bd99dc85 | 6099 | { |
0dc587d4 | 6100 | return true; |
bd99dc85 PA |
6101 | } |
6102 | ||
0dc587d4 TBA |
6103 | bool |
6104 | linux_process_target::async (bool enable) | |
bd99dc85 | 6105 | { |
0dc587d4 | 6106 | bool previous = target_is_async_p (); |
bd99dc85 | 6107 | |
8336d594 | 6108 | if (debug_threads) |
87ce2a04 DE |
6109 | debug_printf ("linux_async (%d), previous=%d\n", |
6110 | enable, previous); | |
8336d594 | 6111 | |
bd99dc85 PA |
6112 | if (previous != enable) |
6113 | { | |
6114 | sigset_t mask; | |
6115 | sigemptyset (&mask); | |
6116 | sigaddset (&mask, SIGCHLD); | |
6117 | ||
21987b9c | 6118 | gdb_sigmask (SIG_BLOCK, &mask, NULL); |
bd99dc85 PA |
6119 | |
6120 | if (enable) | |
6121 | { | |
6122 | if (pipe (linux_event_pipe) == -1) | |
aa96c426 GB |
6123 | { |
6124 | linux_event_pipe[0] = -1; | |
6125 | linux_event_pipe[1] = -1; | |
21987b9c | 6126 | gdb_sigmask (SIG_UNBLOCK, &mask, NULL); |
aa96c426 GB |
6127 | |
6128 | warning ("creating event pipe failed."); | |
6129 | return previous; | |
6130 | } | |
bd99dc85 PA |
6131 | |
6132 | fcntl (linux_event_pipe[0], F_SETFL, O_NONBLOCK); | |
6133 | fcntl (linux_event_pipe[1], F_SETFL, O_NONBLOCK); | |
6134 | ||
6135 | /* Register the event loop handler. */ | |
6136 | add_file_handler (linux_event_pipe[0], | |
6137 | handle_target_event, NULL); | |
6138 | ||
6139 | /* Always trigger a linux_wait. */ | |
6140 | async_file_mark (); | |
6141 | } | |
6142 | else | |
6143 | { | |
6144 | delete_file_handler (linux_event_pipe[0]); | |
6145 | ||
6146 | close (linux_event_pipe[0]); | |
6147 | close (linux_event_pipe[1]); | |
6148 | linux_event_pipe[0] = -1; | |
6149 | linux_event_pipe[1] = -1; | |
6150 | } | |
6151 | ||
21987b9c | 6152 | gdb_sigmask (SIG_UNBLOCK, &mask, NULL); |
bd99dc85 PA |
6153 | } |
6154 | ||
6155 | return previous; | |
6156 | } | |
6157 | ||
0dc587d4 TBA |
6158 | int |
6159 | linux_process_target::start_non_stop (bool nonstop) | |
bd99dc85 PA |
6160 | { |
6161 | /* Register or unregister from event-loop accordingly. */ | |
0dc587d4 | 6162 | target_async (nonstop); |
aa96c426 | 6163 | |
0dc587d4 | 6164 | if (target_is_async_p () != (nonstop != false)) |
aa96c426 GB |
6165 | return -1; |
6166 | ||
bd99dc85 PA |
6167 | return 0; |
6168 | } | |
6169 | ||
652aef77 TBA |
6170 | bool |
6171 | linux_process_target::supports_multi_process () | |
cf8fd78b | 6172 | { |
652aef77 | 6173 | return true; |
cf8fd78b PA |
6174 | } |
6175 | ||
89245bc0 DB |
6176 | /* Check if fork events are supported. */ |
6177 | ||
9690a72a TBA |
6178 | bool |
6179 | linux_process_target::supports_fork_events () | |
89245bc0 DB |
6180 | { |
6181 | return linux_supports_tracefork (); | |
6182 | } | |
6183 | ||
6184 | /* Check if vfork events are supported. */ | |
6185 | ||
9690a72a TBA |
6186 | bool |
6187 | linux_process_target::supports_vfork_events () | |
89245bc0 DB |
6188 | { |
6189 | return linux_supports_tracefork (); | |
6190 | } | |
6191 | ||
94585166 DB |
6192 | /* Check if exec events are supported. */ |
6193 | ||
9690a72a TBA |
6194 | bool |
6195 | linux_process_target::supports_exec_events () | |
94585166 DB |
6196 | { |
6197 | return linux_supports_traceexec (); | |
6198 | } | |
6199 | ||
de0d863e DB |
6200 | /* Target hook for 'handle_new_gdb_connection'. Causes a reset of the |
6201 | ptrace flags for all inferiors. This is in case the new GDB connection | |
6202 | doesn't support the same set of events that the previous one did. */ | |
6203 | ||
fb00dfce TBA |
6204 | void |
6205 | linux_process_target::handle_new_gdb_connection () | |
de0d863e | 6206 | { |
de0d863e | 6207 | /* Request that all the lwps reset their ptrace options. */ |
bbf550d5 SM |
6208 | for_each_thread ([] (thread_info *thread) |
6209 | { | |
6210 | struct lwp_info *lwp = get_thread_lwp (thread); | |
6211 | ||
6212 | if (!lwp->stopped) | |
6213 | { | |
6214 | /* Stop the lwp so we can modify its ptrace options. */ | |
6215 | lwp->must_set_ptrace_flags = 1; | |
6216 | linux_stop_lwp (lwp); | |
6217 | } | |
6218 | else | |
6219 | { | |
6220 | /* Already stopped; go ahead and set the ptrace options. */ | |
6221 | struct process_info *proc = find_process_pid (pid_of (thread)); | |
6222 | int options = linux_low_ptrace_options (proc->attached); | |
6223 | ||
6224 | linux_enable_event_reporting (lwpid_of (thread), options); | |
6225 | lwp->must_set_ptrace_flags = 0; | |
6226 | } | |
6227 | }); | |
de0d863e DB |
6228 | } |
6229 | ||
55cf3021 TBA |
6230 | int |
6231 | linux_process_target::handle_monitor_command (char *mon) | |
6232 | { | |
6233 | #ifdef USE_THREAD_DB | |
6234 | return thread_db_handle_monitor_command (mon); | |
6235 | #else | |
6236 | return 0; | |
6237 | #endif | |
6238 | } | |
6239 | ||
95a45fc1 TBA |
6240 | int |
6241 | linux_process_target::core_of_thread (ptid_t ptid) | |
6242 | { | |
6243 | return linux_common_core_of_thread (ptid); | |
6244 | } | |
6245 | ||
c756403b TBA |
6246 | bool |
6247 | linux_process_target::supports_disable_randomization () | |
03583c20 UW |
6248 | { |
6249 | #ifdef HAVE_PERSONALITY | |
c756403b | 6250 | return true; |
03583c20 | 6251 | #else |
c756403b | 6252 | return false; |
03583c20 UW |
6253 | #endif |
6254 | } | |
efcbbd14 | 6255 | |
c0245cb9 TBA |
6256 | bool |
6257 | linux_process_target::supports_agent () | |
d1feda86 | 6258 | { |
c0245cb9 | 6259 | return true; |
d1feda86 YQ |
6260 | } |
6261 | ||
2526e0cd TBA |
6262 | bool |
6263 | linux_process_target::supports_range_stepping () | |
c2d6af84 | 6264 | { |
7582c77c | 6265 | if (supports_software_single_step ()) |
2526e0cd | 6266 | return true; |
c2d6af84 | 6267 | |
9cfd8715 TBA |
6268 | return low_supports_range_stepping (); |
6269 | } | |
6270 | ||
6271 | bool | |
6272 | linux_process_target::low_supports_range_stepping () | |
6273 | { | |
6274 | return false; | |
c2d6af84 PA |
6275 | } |
6276 | ||
8247b823 TBA |
6277 | bool |
6278 | linux_process_target::supports_pid_to_exec_file () | |
6279 | { | |
6280 | return true; | |
6281 | } | |
6282 | ||
6283 | char * | |
6284 | linux_process_target::pid_to_exec_file (int pid) | |
6285 | { | |
6286 | return linux_proc_pid_to_exec_file (pid); | |
6287 | } | |
6288 | ||
c9b7b804 TBA |
6289 | bool |
6290 | linux_process_target::supports_multifs () | |
6291 | { | |
6292 | return true; | |
6293 | } | |
6294 | ||
6295 | int | |
6296 | linux_process_target::multifs_open (int pid, const char *filename, | |
6297 | int flags, mode_t mode) | |
6298 | { | |
6299 | return linux_mntns_open_cloexec (pid, filename, flags, mode); | |
6300 | } | |
6301 | ||
6302 | int | |
6303 | linux_process_target::multifs_unlink (int pid, const char *filename) | |
6304 | { | |
6305 | return linux_mntns_unlink (pid, filename); | |
6306 | } | |
6307 | ||
6308 | ssize_t | |
6309 | linux_process_target::multifs_readlink (int pid, const char *filename, | |
6310 | char *buf, size_t bufsiz) | |
6311 | { | |
6312 | return linux_mntns_readlink (pid, filename, buf, bufsiz); | |
6313 | } | |
6314 | ||
723b724b | 6315 | #if defined PT_GETDSBT || defined PTRACE_GETFDPIC |
78d85199 YQ |
6316 | struct target_loadseg |
6317 | { | |
6318 | /* Core address to which the segment is mapped. */ | |
6319 | Elf32_Addr addr; | |
6320 | /* VMA recorded in the program header. */ | |
6321 | Elf32_Addr p_vaddr; | |
6322 | /* Size of this segment in memory. */ | |
6323 | Elf32_Word p_memsz; | |
6324 | }; | |
6325 | ||
723b724b | 6326 | # if defined PT_GETDSBT |
78d85199 YQ |
6327 | struct target_loadmap |
6328 | { | |
6329 | /* Protocol version number, must be zero. */ | |
6330 | Elf32_Word version; | |
6331 | /* Pointer to the DSBT table, its size, and the DSBT index. */ | |
6332 | unsigned *dsbt_table; | |
6333 | unsigned dsbt_size, dsbt_index; | |
6334 | /* Number of segments in this map. */ | |
6335 | Elf32_Word nsegs; | |
6336 | /* The actual memory map. */ | |
6337 | struct target_loadseg segs[/*nsegs*/]; | |
6338 | }; | |
723b724b MF |
6339 | # define LINUX_LOADMAP PT_GETDSBT |
6340 | # define LINUX_LOADMAP_EXEC PTRACE_GETDSBT_EXEC | |
6341 | # define LINUX_LOADMAP_INTERP PTRACE_GETDSBT_INTERP | |
6342 | # else | |
6343 | struct target_loadmap | |
6344 | { | |
6345 | /* Protocol version number, must be zero. */ | |
6346 | Elf32_Half version; | |
6347 | /* Number of segments in this map. */ | |
6348 | Elf32_Half nsegs; | |
6349 | /* The actual memory map. */ | |
6350 | struct target_loadseg segs[/*nsegs*/]; | |
6351 | }; | |
6352 | # define LINUX_LOADMAP PTRACE_GETFDPIC | |
6353 | # define LINUX_LOADMAP_EXEC PTRACE_GETFDPIC_EXEC | |
6354 | # define LINUX_LOADMAP_INTERP PTRACE_GETFDPIC_INTERP | |
6355 | # endif | |
78d85199 | 6356 | |
9da41fda TBA |
6357 | bool |
6358 | linux_process_target::supports_read_loadmap () | |
6359 | { | |
6360 | return true; | |
6361 | } | |
6362 | ||
6363 | int | |
6364 | linux_process_target::read_loadmap (const char *annex, CORE_ADDR offset, | |
6365 | unsigned char *myaddr, unsigned int len) | |
78d85199 | 6366 | { |
0bfdf32f | 6367 | int pid = lwpid_of (current_thread); |
78d85199 YQ |
6368 | int addr = -1; |
6369 | struct target_loadmap *data = NULL; | |
6370 | unsigned int actual_length, copy_length; | |
6371 | ||
6372 | if (strcmp (annex, "exec") == 0) | |
723b724b | 6373 | addr = (int) LINUX_LOADMAP_EXEC; |
78d85199 | 6374 | else if (strcmp (annex, "interp") == 0) |
723b724b | 6375 | addr = (int) LINUX_LOADMAP_INTERP; |
78d85199 YQ |
6376 | else |
6377 | return -1; | |
6378 | ||
723b724b | 6379 | if (ptrace (LINUX_LOADMAP, pid, addr, &data) != 0) |
78d85199 YQ |
6380 | return -1; |
6381 | ||
6382 | if (data == NULL) | |
6383 | return -1; | |
6384 | ||
6385 | actual_length = sizeof (struct target_loadmap) | |
6386 | + sizeof (struct target_loadseg) * data->nsegs; | |
6387 | ||
6388 | if (offset < 0 || offset > actual_length) | |
6389 | return -1; | |
6390 | ||
6391 | copy_length = actual_length - offset < len ? actual_length - offset : len; | |
6392 | memcpy (myaddr, (char *) data + offset, copy_length); | |
6393 | return copy_length; | |
6394 | } | |
723b724b | 6395 | #endif /* defined PT_GETDSBT || defined PTRACE_GETFDPIC */ |
78d85199 | 6396 | |
bc8d3ae4 TBA |
6397 | bool |
6398 | linux_process_target::supports_catch_syscall () | |
82075af2 | 6399 | { |
9eedd27d | 6400 | return (low_supports_catch_syscall () |
82075af2 JS |
6401 | && linux_supports_tracesysgood ()); |
6402 | } | |
6403 | ||
9eedd27d TBA |
6404 | bool |
6405 | linux_process_target::low_supports_catch_syscall () | |
6406 | { | |
6407 | return false; | |
6408 | } | |
6409 | ||
770d8f6a TBA |
6410 | CORE_ADDR |
6411 | linux_process_target::read_pc (regcache *regcache) | |
219f2f23 | 6412 | { |
bf9ae9d8 | 6413 | if (!low_supports_breakpoints ()) |
219f2f23 PA |
6414 | return 0; |
6415 | ||
bf9ae9d8 | 6416 | return low_get_pc (regcache); |
219f2f23 PA |
6417 | } |
6418 | ||
770d8f6a TBA |
6419 | void |
6420 | linux_process_target::write_pc (regcache *regcache, CORE_ADDR pc) | |
219f2f23 | 6421 | { |
bf9ae9d8 | 6422 | gdb_assert (low_supports_breakpoints ()); |
219f2f23 | 6423 | |
bf9ae9d8 | 6424 | low_set_pc (regcache, pc); |
219f2f23 PA |
6425 | } |
6426 | ||
68119632 TBA |
6427 | bool |
6428 | linux_process_target::supports_thread_stopped () | |
6429 | { | |
6430 | return true; | |
6431 | } | |
6432 | ||
6433 | bool | |
6434 | linux_process_target::thread_stopped (thread_info *thread) | |
8336d594 PA |
6435 | { |
6436 | return get_thread_lwp (thread)->stopped; | |
6437 | } | |
6438 | ||
6439 | /* This exposes stop-all-threads functionality to other modules. */ | |
6440 | ||
29e8dc09 TBA |
6441 | void |
6442 | linux_process_target::pause_all (bool freeze) | |
8336d594 | 6443 | { |
7984d532 PA |
6444 | stop_all_lwps (freeze, NULL); |
6445 | } | |
6446 | ||
6447 | /* This exposes unstop-all-threads functionality to other gdbserver | |
6448 | modules. */ | |
6449 | ||
29e8dc09 TBA |
6450 | void |
6451 | linux_process_target::unpause_all (bool unfreeze) | |
7984d532 PA |
6452 | { |
6453 | unstop_all_lwps (unfreeze, NULL); | |
8336d594 PA |
6454 | } |
6455 | ||
79b44087 TBA |
6456 | int |
6457 | linux_process_target::prepare_to_access_memory () | |
90d74c30 PA |
6458 | { |
6459 | /* Neither ptrace nor /proc/PID/mem allow accessing memory through a | |
6460 | running LWP. */ | |
6461 | if (non_stop) | |
29e8dc09 | 6462 | target_pause_all (true); |
90d74c30 PA |
6463 | return 0; |
6464 | } | |
6465 | ||
79b44087 TBA |
6466 | void |
6467 | linux_process_target::done_accessing_memory () | |
90d74c30 PA |
6468 | { |
6469 | /* Neither ptrace nor /proc/PID/mem allow accessing memory through a | |
6470 | running LWP. */ | |
6471 | if (non_stop) | |
29e8dc09 | 6472 | target_unpause_all (true); |
90d74c30 PA |
6473 | } |
6474 | ||
2268b414 JK |
6475 | /* Extract &phdr and num_phdr in the inferior. Return 0 on success. */ |
6476 | ||
6477 | static int | |
6478 | get_phdr_phnum_from_proc_auxv (const int pid, const int is_elf64, | |
6479 | CORE_ADDR *phdr_memaddr, int *num_phdr) | |
6480 | { | |
6481 | char filename[PATH_MAX]; | |
6482 | int fd; | |
6483 | const int auxv_size = is_elf64 | |
6484 | ? sizeof (Elf64_auxv_t) : sizeof (Elf32_auxv_t); | |
6485 | char buf[sizeof (Elf64_auxv_t)]; /* The larger of the two. */ | |
6486 | ||
6487 | xsnprintf (filename, sizeof filename, "/proc/%d/auxv", pid); | |
6488 | ||
6489 | fd = open (filename, O_RDONLY); | |
6490 | if (fd < 0) | |
6491 | return 1; | |
6492 | ||
6493 | *phdr_memaddr = 0; | |
6494 | *num_phdr = 0; | |
6495 | while (read (fd, buf, auxv_size) == auxv_size | |
6496 | && (*phdr_memaddr == 0 || *num_phdr == 0)) | |
6497 | { | |
6498 | if (is_elf64) | |
6499 | { | |
6500 | Elf64_auxv_t *const aux = (Elf64_auxv_t *) buf; | |
6501 | ||
6502 | switch (aux->a_type) | |
6503 | { | |
6504 | case AT_PHDR: | |
6505 | *phdr_memaddr = aux->a_un.a_val; | |
6506 | break; | |
6507 | case AT_PHNUM: | |
6508 | *num_phdr = aux->a_un.a_val; | |
6509 | break; | |
6510 | } | |
6511 | } | |
6512 | else | |
6513 | { | |
6514 | Elf32_auxv_t *const aux = (Elf32_auxv_t *) buf; | |
6515 | ||
6516 | switch (aux->a_type) | |
6517 | { | |
6518 | case AT_PHDR: | |
6519 | *phdr_memaddr = aux->a_un.a_val; | |
6520 | break; | |
6521 | case AT_PHNUM: | |
6522 | *num_phdr = aux->a_un.a_val; | |
6523 | break; | |
6524 | } | |
6525 | } | |
6526 | } | |
6527 | ||
6528 | close (fd); | |
6529 | ||
6530 | if (*phdr_memaddr == 0 || *num_phdr == 0) | |
6531 | { | |
6532 | warning ("Unexpected missing AT_PHDR and/or AT_PHNUM: " | |
6533 | "phdr_memaddr = %ld, phdr_num = %d", | |
6534 | (long) *phdr_memaddr, *num_phdr); | |
6535 | return 2; | |
6536 | } | |
6537 | ||
6538 | return 0; | |
6539 | } | |
6540 | ||
6541 | /* Return &_DYNAMIC (via PT_DYNAMIC) in the inferior, or 0 if not present. */ | |
6542 | ||
6543 | static CORE_ADDR | |
6544 | get_dynamic (const int pid, const int is_elf64) | |
6545 | { | |
6546 | CORE_ADDR phdr_memaddr, relocation; | |
db1ff28b | 6547 | int num_phdr, i; |
2268b414 | 6548 | unsigned char *phdr_buf; |
db1ff28b | 6549 | const int phdr_size = is_elf64 ? sizeof (Elf64_Phdr) : sizeof (Elf32_Phdr); |
2268b414 JK |
6550 | |
6551 | if (get_phdr_phnum_from_proc_auxv (pid, is_elf64, &phdr_memaddr, &num_phdr)) | |
6552 | return 0; | |
6553 | ||
6554 | gdb_assert (num_phdr < 100); /* Basic sanity check. */ | |
224c3ddb | 6555 | phdr_buf = (unsigned char *) alloca (num_phdr * phdr_size); |
2268b414 JK |
6556 | |
6557 | if (linux_read_memory (phdr_memaddr, phdr_buf, num_phdr * phdr_size)) | |
6558 | return 0; | |
6559 | ||
6560 | /* Compute relocation: it is expected to be 0 for "regular" executables, | |
6561 | non-zero for PIE ones. */ | |
6562 | relocation = -1; | |
db1ff28b JK |
6563 | for (i = 0; relocation == -1 && i < num_phdr; i++) |
6564 | if (is_elf64) | |
6565 | { | |
6566 | Elf64_Phdr *const p = (Elf64_Phdr *) (phdr_buf + i * phdr_size); | |
6567 | ||
6568 | if (p->p_type == PT_PHDR) | |
6569 | relocation = phdr_memaddr - p->p_vaddr; | |
6570 | } | |
6571 | else | |
6572 | { | |
6573 | Elf32_Phdr *const p = (Elf32_Phdr *) (phdr_buf + i * phdr_size); | |
6574 | ||
6575 | if (p->p_type == PT_PHDR) | |
6576 | relocation = phdr_memaddr - p->p_vaddr; | |
6577 | } | |
6578 | ||
2268b414 JK |
6579 | if (relocation == -1) |
6580 | { | |
e237a7e2 JK |
6581 | /* PT_PHDR is optional, but necessary for PIE in general. Fortunately |
6582 | any real world executables, including PIE executables, have always | |
6583 | PT_PHDR present. PT_PHDR is not present in some shared libraries or | |
6584 | in fpc (Free Pascal 2.4) binaries but neither of those have a need for | |
6585 | or present DT_DEBUG anyway (fpc binaries are statically linked). | |
6586 | ||
6587 | Therefore if there exists DT_DEBUG there is always also PT_PHDR. | |
6588 | ||
6589 | GDB could find RELOCATION also from AT_ENTRY - e_entry. */ | |
6590 | ||
2268b414 JK |
6591 | return 0; |
6592 | } | |
6593 | ||
db1ff28b JK |
6594 | for (i = 0; i < num_phdr; i++) |
6595 | { | |
6596 | if (is_elf64) | |
6597 | { | |
6598 | Elf64_Phdr *const p = (Elf64_Phdr *) (phdr_buf + i * phdr_size); | |
6599 | ||
6600 | if (p->p_type == PT_DYNAMIC) | |
6601 | return p->p_vaddr + relocation; | |
6602 | } | |
6603 | else | |
6604 | { | |
6605 | Elf32_Phdr *const p = (Elf32_Phdr *) (phdr_buf + i * phdr_size); | |
2268b414 | 6606 | |
db1ff28b JK |
6607 | if (p->p_type == PT_DYNAMIC) |
6608 | return p->p_vaddr + relocation; | |
6609 | } | |
6610 | } | |
2268b414 JK |
6611 | |
6612 | return 0; | |
6613 | } | |
6614 | ||
6615 | /* Return &_r_debug in the inferior, or -1 if not present. Return value | |
367ba2c2 MR |
6616 | can be 0 if the inferior does not yet have the library list initialized. |
6617 | We look for DT_MIPS_RLD_MAP first. MIPS executables use this instead of | |
6618 | DT_DEBUG, although they sometimes contain an unused DT_DEBUG entry too. */ | |
2268b414 JK |
6619 | |
6620 | static CORE_ADDR | |
6621 | get_r_debug (const int pid, const int is_elf64) | |
6622 | { | |
6623 | CORE_ADDR dynamic_memaddr; | |
6624 | const int dyn_size = is_elf64 ? sizeof (Elf64_Dyn) : sizeof (Elf32_Dyn); | |
6625 | unsigned char buf[sizeof (Elf64_Dyn)]; /* The larger of the two. */ | |
367ba2c2 | 6626 | CORE_ADDR map = -1; |
2268b414 JK |
6627 | |
6628 | dynamic_memaddr = get_dynamic (pid, is_elf64); | |
6629 | if (dynamic_memaddr == 0) | |
367ba2c2 | 6630 | return map; |
2268b414 JK |
6631 | |
6632 | while (linux_read_memory (dynamic_memaddr, buf, dyn_size) == 0) | |
6633 | { | |
6634 | if (is_elf64) | |
6635 | { | |
6636 | Elf64_Dyn *const dyn = (Elf64_Dyn *) buf; | |
a738da3a | 6637 | #if defined DT_MIPS_RLD_MAP || defined DT_MIPS_RLD_MAP_REL |
367ba2c2 MR |
6638 | union |
6639 | { | |
6640 | Elf64_Xword map; | |
6641 | unsigned char buf[sizeof (Elf64_Xword)]; | |
6642 | } | |
6643 | rld_map; | |
a738da3a MF |
6644 | #endif |
6645 | #ifdef DT_MIPS_RLD_MAP | |
367ba2c2 MR |
6646 | if (dyn->d_tag == DT_MIPS_RLD_MAP) |
6647 | { | |
6648 | if (linux_read_memory (dyn->d_un.d_val, | |
6649 | rld_map.buf, sizeof (rld_map.buf)) == 0) | |
6650 | return rld_map.map; | |
6651 | else | |
6652 | break; | |
6653 | } | |
75f62ce7 | 6654 | #endif /* DT_MIPS_RLD_MAP */ |
a738da3a MF |
6655 | #ifdef DT_MIPS_RLD_MAP_REL |
6656 | if (dyn->d_tag == DT_MIPS_RLD_MAP_REL) | |
6657 | { | |
6658 | if (linux_read_memory (dyn->d_un.d_val + dynamic_memaddr, | |
6659 | rld_map.buf, sizeof (rld_map.buf)) == 0) | |
6660 | return rld_map.map; | |
6661 | else | |
6662 | break; | |
6663 | } | |
6664 | #endif /* DT_MIPS_RLD_MAP_REL */ | |
2268b414 | 6665 | |
367ba2c2 MR |
6666 | if (dyn->d_tag == DT_DEBUG && map == -1) |
6667 | map = dyn->d_un.d_val; | |
2268b414 JK |
6668 | |
6669 | if (dyn->d_tag == DT_NULL) | |
6670 | break; | |
6671 | } | |
6672 | else | |
6673 | { | |
6674 | Elf32_Dyn *const dyn = (Elf32_Dyn *) buf; | |
a738da3a | 6675 | #if defined DT_MIPS_RLD_MAP || defined DT_MIPS_RLD_MAP_REL |
367ba2c2 MR |
6676 | union |
6677 | { | |
6678 | Elf32_Word map; | |
6679 | unsigned char buf[sizeof (Elf32_Word)]; | |
6680 | } | |
6681 | rld_map; | |
a738da3a MF |
6682 | #endif |
6683 | #ifdef DT_MIPS_RLD_MAP | |
367ba2c2 MR |
6684 | if (dyn->d_tag == DT_MIPS_RLD_MAP) |
6685 | { | |
6686 | if (linux_read_memory (dyn->d_un.d_val, | |
6687 | rld_map.buf, sizeof (rld_map.buf)) == 0) | |
6688 | return rld_map.map; | |
6689 | else | |
6690 | break; | |
6691 | } | |
75f62ce7 | 6692 | #endif /* DT_MIPS_RLD_MAP */ |
a738da3a MF |
6693 | #ifdef DT_MIPS_RLD_MAP_REL |
6694 | if (dyn->d_tag == DT_MIPS_RLD_MAP_REL) | |
6695 | { | |
6696 | if (linux_read_memory (dyn->d_un.d_val + dynamic_memaddr, | |
6697 | rld_map.buf, sizeof (rld_map.buf)) == 0) | |
6698 | return rld_map.map; | |
6699 | else | |
6700 | break; | |
6701 | } | |
6702 | #endif /* DT_MIPS_RLD_MAP_REL */ | |
2268b414 | 6703 | |
367ba2c2 MR |
6704 | if (dyn->d_tag == DT_DEBUG && map == -1) |
6705 | map = dyn->d_un.d_val; | |
2268b414 JK |
6706 | |
6707 | if (dyn->d_tag == DT_NULL) | |
6708 | break; | |
6709 | } | |
6710 | ||
6711 | dynamic_memaddr += dyn_size; | |
6712 | } | |
6713 | ||
367ba2c2 | 6714 | return map; |
2268b414 JK |
6715 | } |
6716 | ||
6717 | /* Read one pointer from MEMADDR in the inferior. */ | |
6718 | ||
6719 | static int | |
6720 | read_one_ptr (CORE_ADDR memaddr, CORE_ADDR *ptr, int ptr_size) | |
6721 | { | |
485f1ee4 PA |
6722 | int ret; |
6723 | ||
6724 | /* Go through a union so this works on either big or little endian | |
6725 | hosts, when the inferior's pointer size is smaller than the size | |
6726 | of CORE_ADDR. It is assumed the inferior's endianness is the | |
6727 | same of the superior's. */ | |
6728 | union | |
6729 | { | |
6730 | CORE_ADDR core_addr; | |
6731 | unsigned int ui; | |
6732 | unsigned char uc; | |
6733 | } addr; | |
6734 | ||
6735 | ret = linux_read_memory (memaddr, &addr.uc, ptr_size); | |
6736 | if (ret == 0) | |
6737 | { | |
6738 | if (ptr_size == sizeof (CORE_ADDR)) | |
6739 | *ptr = addr.core_addr; | |
6740 | else if (ptr_size == sizeof (unsigned int)) | |
6741 | *ptr = addr.ui; | |
6742 | else | |
6743 | gdb_assert_not_reached ("unhandled pointer size"); | |
6744 | } | |
6745 | return ret; | |
2268b414 JK |
6746 | } |
6747 | ||
974387bb TBA |
6748 | bool |
6749 | linux_process_target::supports_qxfer_libraries_svr4 () | |
6750 | { | |
6751 | return true; | |
6752 | } | |
6753 | ||
2268b414 JK |
6754 | struct link_map_offsets |
6755 | { | |
6756 | /* Offset and size of r_debug.r_version. */ | |
6757 | int r_version_offset; | |
6758 | ||
6759 | /* Offset and size of r_debug.r_map. */ | |
6760 | int r_map_offset; | |
6761 | ||
6762 | /* Offset to l_addr field in struct link_map. */ | |
6763 | int l_addr_offset; | |
6764 | ||
6765 | /* Offset to l_name field in struct link_map. */ | |
6766 | int l_name_offset; | |
6767 | ||
6768 | /* Offset to l_ld field in struct link_map. */ | |
6769 | int l_ld_offset; | |
6770 | ||
6771 | /* Offset to l_next field in struct link_map. */ | |
6772 | int l_next_offset; | |
6773 | ||
6774 | /* Offset to l_prev field in struct link_map. */ | |
6775 | int l_prev_offset; | |
6776 | }; | |
6777 | ||
fb723180 | 6778 | /* Construct qXfer:libraries-svr4:read reply. */ |
2268b414 | 6779 | |
974387bb TBA |
6780 | int |
6781 | linux_process_target::qxfer_libraries_svr4 (const char *annex, | |
6782 | unsigned char *readbuf, | |
6783 | unsigned const char *writebuf, | |
6784 | CORE_ADDR offset, int len) | |
2268b414 | 6785 | { |
fe978cb0 | 6786 | struct process_info_private *const priv = current_process ()->priv; |
2268b414 JK |
6787 | char filename[PATH_MAX]; |
6788 | int pid, is_elf64; | |
6789 | ||
6790 | static const struct link_map_offsets lmo_32bit_offsets = | |
6791 | { | |
6792 | 0, /* r_version offset. */ | |
6793 | 4, /* r_debug.r_map offset. */ | |
6794 | 0, /* l_addr offset in link_map. */ | |
6795 | 4, /* l_name offset in link_map. */ | |
6796 | 8, /* l_ld offset in link_map. */ | |
6797 | 12, /* l_next offset in link_map. */ | |
6798 | 16 /* l_prev offset in link_map. */ | |
6799 | }; | |
6800 | ||
6801 | static const struct link_map_offsets lmo_64bit_offsets = | |
6802 | { | |
6803 | 0, /* r_version offset. */ | |
6804 | 8, /* r_debug.r_map offset. */ | |
6805 | 0, /* l_addr offset in link_map. */ | |
6806 | 8, /* l_name offset in link_map. */ | |
6807 | 16, /* l_ld offset in link_map. */ | |
6808 | 24, /* l_next offset in link_map. */ | |
6809 | 32 /* l_prev offset in link_map. */ | |
6810 | }; | |
6811 | const struct link_map_offsets *lmo; | |
214d508e | 6812 | unsigned int machine; |
b1fbec62 GB |
6813 | int ptr_size; |
6814 | CORE_ADDR lm_addr = 0, lm_prev = 0; | |
b1fbec62 GB |
6815 | CORE_ADDR l_name, l_addr, l_ld, l_next, l_prev; |
6816 | int header_done = 0; | |
2268b414 JK |
6817 | |
6818 | if (writebuf != NULL) | |
6819 | return -2; | |
6820 | if (readbuf == NULL) | |
6821 | return -1; | |
6822 | ||
0bfdf32f | 6823 | pid = lwpid_of (current_thread); |
2268b414 | 6824 | xsnprintf (filename, sizeof filename, "/proc/%d/exe", pid); |
214d508e | 6825 | is_elf64 = elf_64_file_p (filename, &machine); |
2268b414 | 6826 | lmo = is_elf64 ? &lmo_64bit_offsets : &lmo_32bit_offsets; |
b1fbec62 | 6827 | ptr_size = is_elf64 ? 8 : 4; |
2268b414 | 6828 | |
b1fbec62 GB |
6829 | while (annex[0] != '\0') |
6830 | { | |
6831 | const char *sep; | |
6832 | CORE_ADDR *addrp; | |
da4ae14a | 6833 | int name_len; |
2268b414 | 6834 | |
b1fbec62 GB |
6835 | sep = strchr (annex, '='); |
6836 | if (sep == NULL) | |
6837 | break; | |
0c5bf5a9 | 6838 | |
da4ae14a TT |
6839 | name_len = sep - annex; |
6840 | if (name_len == 5 && startswith (annex, "start")) | |
b1fbec62 | 6841 | addrp = &lm_addr; |
da4ae14a | 6842 | else if (name_len == 4 && startswith (annex, "prev")) |
b1fbec62 GB |
6843 | addrp = &lm_prev; |
6844 | else | |
6845 | { | |
6846 | annex = strchr (sep, ';'); | |
6847 | if (annex == NULL) | |
6848 | break; | |
6849 | annex++; | |
6850 | continue; | |
6851 | } | |
6852 | ||
6853 | annex = decode_address_to_semicolon (addrp, sep + 1); | |
2268b414 | 6854 | } |
b1fbec62 GB |
6855 | |
6856 | if (lm_addr == 0) | |
2268b414 | 6857 | { |
b1fbec62 GB |
6858 | int r_version = 0; |
6859 | ||
6860 | if (priv->r_debug == 0) | |
6861 | priv->r_debug = get_r_debug (pid, is_elf64); | |
6862 | ||
6863 | /* We failed to find DT_DEBUG. Such situation will not change | |
6864 | for this inferior - do not retry it. Report it to GDB as | |
6865 | E01, see for the reasons at the GDB solib-svr4.c side. */ | |
6866 | if (priv->r_debug == (CORE_ADDR) -1) | |
6867 | return -1; | |
6868 | ||
6869 | if (priv->r_debug != 0) | |
2268b414 | 6870 | { |
b1fbec62 GB |
6871 | if (linux_read_memory (priv->r_debug + lmo->r_version_offset, |
6872 | (unsigned char *) &r_version, | |
6873 | sizeof (r_version)) != 0 | |
6874 | || r_version != 1) | |
6875 | { | |
6876 | warning ("unexpected r_debug version %d", r_version); | |
6877 | } | |
6878 | else if (read_one_ptr (priv->r_debug + lmo->r_map_offset, | |
6879 | &lm_addr, ptr_size) != 0) | |
6880 | { | |
6881 | warning ("unable to read r_map from 0x%lx", | |
6882 | (long) priv->r_debug + lmo->r_map_offset); | |
6883 | } | |
2268b414 | 6884 | } |
b1fbec62 | 6885 | } |
2268b414 | 6886 | |
f6e8a41e | 6887 | std::string document = "<library-list-svr4 version=\"1.0\""; |
b1fbec62 GB |
6888 | |
6889 | while (lm_addr | |
6890 | && read_one_ptr (lm_addr + lmo->l_name_offset, | |
6891 | &l_name, ptr_size) == 0 | |
6892 | && read_one_ptr (lm_addr + lmo->l_addr_offset, | |
6893 | &l_addr, ptr_size) == 0 | |
6894 | && read_one_ptr (lm_addr + lmo->l_ld_offset, | |
6895 | &l_ld, ptr_size) == 0 | |
6896 | && read_one_ptr (lm_addr + lmo->l_prev_offset, | |
6897 | &l_prev, ptr_size) == 0 | |
6898 | && read_one_ptr (lm_addr + lmo->l_next_offset, | |
6899 | &l_next, ptr_size) == 0) | |
6900 | { | |
6901 | unsigned char libname[PATH_MAX]; | |
6902 | ||
6903 | if (lm_prev != l_prev) | |
2268b414 | 6904 | { |
b1fbec62 GB |
6905 | warning ("Corrupted shared library list: 0x%lx != 0x%lx", |
6906 | (long) lm_prev, (long) l_prev); | |
6907 | break; | |
2268b414 JK |
6908 | } |
6909 | ||
d878444c JK |
6910 | /* Ignore the first entry even if it has valid name as the first entry |
6911 | corresponds to the main executable. The first entry should not be | |
6912 | skipped if the dynamic loader was loaded late by a static executable | |
6913 | (see solib-svr4.c parameter ignore_first). But in such case the main | |
6914 | executable does not have PT_DYNAMIC present and this function already | |
6915 | exited above due to failed get_r_debug. */ | |
6916 | if (lm_prev == 0) | |
f6e8a41e | 6917 | string_appendf (document, " main-lm=\"0x%lx\"", (unsigned long) lm_addr); |
d878444c JK |
6918 | else |
6919 | { | |
6920 | /* Not checking for error because reading may stop before | |
6921 | we've got PATH_MAX worth of characters. */ | |
6922 | libname[0] = '\0'; | |
6923 | linux_read_memory (l_name, libname, sizeof (libname) - 1); | |
6924 | libname[sizeof (libname) - 1] = '\0'; | |
6925 | if (libname[0] != '\0') | |
2268b414 | 6926 | { |
d878444c JK |
6927 | if (!header_done) |
6928 | { | |
6929 | /* Terminate `<library-list-svr4'. */ | |
f6e8a41e | 6930 | document += '>'; |
d878444c JK |
6931 | header_done = 1; |
6932 | } | |
2268b414 | 6933 | |
e6a58aa8 SM |
6934 | string_appendf (document, "<library name=\""); |
6935 | xml_escape_text_append (&document, (char *) libname); | |
6936 | string_appendf (document, "\" lm=\"0x%lx\" " | |
f6e8a41e | 6937 | "l_addr=\"0x%lx\" l_ld=\"0x%lx\"/>", |
e6a58aa8 SM |
6938 | (unsigned long) lm_addr, (unsigned long) l_addr, |
6939 | (unsigned long) l_ld); | |
d878444c | 6940 | } |
0afae3cf | 6941 | } |
b1fbec62 GB |
6942 | |
6943 | lm_prev = lm_addr; | |
6944 | lm_addr = l_next; | |
2268b414 JK |
6945 | } |
6946 | ||
b1fbec62 GB |
6947 | if (!header_done) |
6948 | { | |
6949 | /* Empty list; terminate `<library-list-svr4'. */ | |
f6e8a41e | 6950 | document += "/>"; |
b1fbec62 GB |
6951 | } |
6952 | else | |
f6e8a41e | 6953 | document += "</library-list-svr4>"; |
b1fbec62 | 6954 | |
f6e8a41e | 6955 | int document_len = document.length (); |
2268b414 JK |
6956 | if (offset < document_len) |
6957 | document_len -= offset; | |
6958 | else | |
6959 | document_len = 0; | |
6960 | if (len > document_len) | |
6961 | len = document_len; | |
6962 | ||
f6e8a41e | 6963 | memcpy (readbuf, document.data () + offset, len); |
2268b414 JK |
6964 | |
6965 | return len; | |
6966 | } | |
6967 | ||
9accd112 MM |
6968 | #ifdef HAVE_LINUX_BTRACE |
6969 | ||
79597bdd TBA |
6970 | btrace_target_info * |
6971 | linux_process_target::enable_btrace (ptid_t ptid, | |
6972 | const btrace_config *conf) | |
6973 | { | |
6974 | return linux_enable_btrace (ptid, conf); | |
6975 | } | |
6976 | ||
969c39fb | 6977 | /* See to_disable_btrace target method. */ |
9accd112 | 6978 | |
79597bdd TBA |
6979 | int |
6980 | linux_process_target::disable_btrace (btrace_target_info *tinfo) | |
969c39fb MM |
6981 | { |
6982 | enum btrace_error err; | |
6983 | ||
6984 | err = linux_disable_btrace (tinfo); | |
6985 | return (err == BTRACE_ERR_NONE ? 0 : -1); | |
6986 | } | |
6987 | ||
bc504a31 | 6988 | /* Encode an Intel Processor Trace configuration. */ |
b20a6524 MM |
6989 | |
6990 | static void | |
6991 | linux_low_encode_pt_config (struct buffer *buffer, | |
6992 | const struct btrace_data_pt_config *config) | |
6993 | { | |
6994 | buffer_grow_str (buffer, "<pt-config>\n"); | |
6995 | ||
6996 | switch (config->cpu.vendor) | |
6997 | { | |
6998 | case CV_INTEL: | |
6999 | buffer_xml_printf (buffer, "<cpu vendor=\"GenuineIntel\" family=\"%u\" " | |
7000 | "model=\"%u\" stepping=\"%u\"/>\n", | |
7001 | config->cpu.family, config->cpu.model, | |
7002 | config->cpu.stepping); | |
7003 | break; | |
7004 | ||
7005 | default: | |
7006 | break; | |
7007 | } | |
7008 | ||
7009 | buffer_grow_str (buffer, "</pt-config>\n"); | |
7010 | } | |
7011 | ||
7012 | /* Encode a raw buffer. */ | |
7013 | ||
7014 | static void | |
7015 | linux_low_encode_raw (struct buffer *buffer, const gdb_byte *data, | |
7016 | unsigned int size) | |
7017 | { | |
7018 | if (size == 0) | |
7019 | return; | |
7020 | ||
268a13a5 | 7021 | /* We use hex encoding - see gdbsupport/rsp-low.h. */ |
b20a6524 MM |
7022 | buffer_grow_str (buffer, "<raw>\n"); |
7023 | ||
7024 | while (size-- > 0) | |
7025 | { | |
7026 | char elem[2]; | |
7027 | ||
7028 | elem[0] = tohex ((*data >> 4) & 0xf); | |
7029 | elem[1] = tohex (*data++ & 0xf); | |
7030 | ||
7031 | buffer_grow (buffer, elem, 2); | |
7032 | } | |
7033 | ||
7034 | buffer_grow_str (buffer, "</raw>\n"); | |
7035 | } | |
7036 | ||
969c39fb MM |
7037 | /* See to_read_btrace target method. */ |
7038 | ||
79597bdd TBA |
7039 | int |
7040 | linux_process_target::read_btrace (btrace_target_info *tinfo, | |
7041 | buffer *buffer, | |
7042 | enum btrace_read_type type) | |
9accd112 | 7043 | { |
734b0e4b | 7044 | struct btrace_data btrace; |
969c39fb | 7045 | enum btrace_error err; |
9accd112 | 7046 | |
969c39fb MM |
7047 | err = linux_read_btrace (&btrace, tinfo, type); |
7048 | if (err != BTRACE_ERR_NONE) | |
7049 | { | |
7050 | if (err == BTRACE_ERR_OVERFLOW) | |
7051 | buffer_grow_str0 (buffer, "E.Overflow."); | |
7052 | else | |
7053 | buffer_grow_str0 (buffer, "E.Generic Error."); | |
7054 | ||
8dcc53b3 | 7055 | return -1; |
969c39fb | 7056 | } |
9accd112 | 7057 | |
734b0e4b MM |
7058 | switch (btrace.format) |
7059 | { | |
7060 | case BTRACE_FORMAT_NONE: | |
7061 | buffer_grow_str0 (buffer, "E.No Trace."); | |
8dcc53b3 | 7062 | return -1; |
734b0e4b MM |
7063 | |
7064 | case BTRACE_FORMAT_BTS: | |
7065 | buffer_grow_str (buffer, "<!DOCTYPE btrace SYSTEM \"btrace.dtd\">\n"); | |
7066 | buffer_grow_str (buffer, "<btrace version=\"1.0\">\n"); | |
9accd112 | 7067 | |
46f29a9a | 7068 | for (const btrace_block &block : *btrace.variant.bts.blocks) |
734b0e4b | 7069 | buffer_xml_printf (buffer, "<block begin=\"0x%s\" end=\"0x%s\"/>\n", |
46f29a9a | 7070 | paddress (block.begin), paddress (block.end)); |
9accd112 | 7071 | |
734b0e4b MM |
7072 | buffer_grow_str0 (buffer, "</btrace>\n"); |
7073 | break; | |
7074 | ||
b20a6524 MM |
7075 | case BTRACE_FORMAT_PT: |
7076 | buffer_grow_str (buffer, "<!DOCTYPE btrace SYSTEM \"btrace.dtd\">\n"); | |
7077 | buffer_grow_str (buffer, "<btrace version=\"1.0\">\n"); | |
7078 | buffer_grow_str (buffer, "<pt>\n"); | |
7079 | ||
7080 | linux_low_encode_pt_config (buffer, &btrace.variant.pt.config); | |
9accd112 | 7081 | |
b20a6524 MM |
7082 | linux_low_encode_raw (buffer, btrace.variant.pt.data, |
7083 | btrace.variant.pt.size); | |
7084 | ||
7085 | buffer_grow_str (buffer, "</pt>\n"); | |
7086 | buffer_grow_str0 (buffer, "</btrace>\n"); | |
7087 | break; | |
7088 | ||
7089 | default: | |
7090 | buffer_grow_str0 (buffer, "E.Unsupported Trace Format."); | |
8dcc53b3 | 7091 | return -1; |
734b0e4b | 7092 | } |
969c39fb MM |
7093 | |
7094 | return 0; | |
9accd112 | 7095 | } |
f4abbc16 MM |
7096 | |
7097 | /* See to_btrace_conf target method. */ | |
7098 | ||
79597bdd TBA |
7099 | int |
7100 | linux_process_target::read_btrace_conf (const btrace_target_info *tinfo, | |
7101 | buffer *buffer) | |
f4abbc16 MM |
7102 | { |
7103 | const struct btrace_config *conf; | |
7104 | ||
7105 | buffer_grow_str (buffer, "<!DOCTYPE btrace-conf SYSTEM \"btrace-conf.dtd\">\n"); | |
7106 | buffer_grow_str (buffer, "<btrace-conf version=\"1.0\">\n"); | |
7107 | ||
7108 | conf = linux_btrace_conf (tinfo); | |
7109 | if (conf != NULL) | |
7110 | { | |
7111 | switch (conf->format) | |
7112 | { | |
7113 | case BTRACE_FORMAT_NONE: | |
7114 | break; | |
7115 | ||
7116 | case BTRACE_FORMAT_BTS: | |
d33501a5 MM |
7117 | buffer_xml_printf (buffer, "<bts"); |
7118 | buffer_xml_printf (buffer, " size=\"0x%x\"", conf->bts.size); | |
7119 | buffer_xml_printf (buffer, " />\n"); | |
f4abbc16 | 7120 | break; |
b20a6524 MM |
7121 | |
7122 | case BTRACE_FORMAT_PT: | |
7123 | buffer_xml_printf (buffer, "<pt"); | |
7124 | buffer_xml_printf (buffer, " size=\"0x%x\"", conf->pt.size); | |
7125 | buffer_xml_printf (buffer, "/>\n"); | |
7126 | break; | |
f4abbc16 MM |
7127 | } |
7128 | } | |
7129 | ||
7130 | buffer_grow_str0 (buffer, "</btrace-conf>\n"); | |
7131 | return 0; | |
7132 | } | |
9accd112 MM |
7133 | #endif /* HAVE_LINUX_BTRACE */ |
7134 | ||
7b669087 GB |
7135 | /* See nat/linux-nat.h. */ |
7136 | ||
7137 | ptid_t | |
7138 | current_lwp_ptid (void) | |
7139 | { | |
7140 | return ptid_of (current_thread); | |
7141 | } | |
7142 | ||
7f63b89b TBA |
7143 | const char * |
7144 | linux_process_target::thread_name (ptid_t thread) | |
7145 | { | |
7146 | return linux_proc_tid_get_name (thread); | |
7147 | } | |
7148 | ||
7149 | #if USE_THREAD_DB | |
7150 | bool | |
7151 | linux_process_target::thread_handle (ptid_t ptid, gdb_byte **handle, | |
7152 | int *handle_len) | |
7153 | { | |
7154 | return thread_db_thread_handle (ptid, handle, handle_len); | |
7155 | } | |
7156 | #endif | |
7157 | ||
276d4552 YQ |
7158 | /* Default implementation of linux_target_ops method "set_pc" for |
7159 | 32-bit pc register which is literally named "pc". */ | |
7160 | ||
7161 | void | |
7162 | linux_set_pc_32bit (struct regcache *regcache, CORE_ADDR pc) | |
7163 | { | |
7164 | uint32_t newpc = pc; | |
7165 | ||
7166 | supply_register_by_name (regcache, "pc", &newpc); | |
7167 | } | |
7168 | ||
7169 | /* Default implementation of linux_target_ops method "get_pc" for | |
7170 | 32-bit pc register which is literally named "pc". */ | |
7171 | ||
7172 | CORE_ADDR | |
7173 | linux_get_pc_32bit (struct regcache *regcache) | |
7174 | { | |
7175 | uint32_t pc; | |
7176 | ||
7177 | collect_register_by_name (regcache, "pc", &pc); | |
7178 | if (debug_threads) | |
7179 | debug_printf ("stop pc is 0x%" PRIx32 "\n", pc); | |
7180 | return pc; | |
7181 | } | |
7182 | ||
6f69e520 YQ |
7183 | /* Default implementation of linux_target_ops method "set_pc" for |
7184 | 64-bit pc register which is literally named "pc". */ | |
7185 | ||
7186 | void | |
7187 | linux_set_pc_64bit (struct regcache *regcache, CORE_ADDR pc) | |
7188 | { | |
7189 | uint64_t newpc = pc; | |
7190 | ||
7191 | supply_register_by_name (regcache, "pc", &newpc); | |
7192 | } | |
7193 | ||
7194 | /* Default implementation of linux_target_ops method "get_pc" for | |
7195 | 64-bit pc register which is literally named "pc". */ | |
7196 | ||
7197 | CORE_ADDR | |
7198 | linux_get_pc_64bit (struct regcache *regcache) | |
7199 | { | |
7200 | uint64_t pc; | |
7201 | ||
7202 | collect_register_by_name (regcache, "pc", &pc); | |
7203 | if (debug_threads) | |
7204 | debug_printf ("stop pc is 0x%" PRIx64 "\n", pc); | |
7205 | return pc; | |
7206 | } | |
7207 | ||
0570503d | 7208 | /* See linux-low.h. */ |
974c89e0 | 7209 | |
0570503d PFC |
7210 | int |
7211 | linux_get_auxv (int wordsize, CORE_ADDR match, CORE_ADDR *valp) | |
974c89e0 AH |
7212 | { |
7213 | gdb_byte *data = (gdb_byte *) alloca (2 * wordsize); | |
7214 | int offset = 0; | |
7215 | ||
7216 | gdb_assert (wordsize == 4 || wordsize == 8); | |
7217 | ||
52405d85 | 7218 | while (the_target->read_auxv (offset, data, 2 * wordsize) == 2 * wordsize) |
974c89e0 AH |
7219 | { |
7220 | if (wordsize == 4) | |
7221 | { | |
0570503d | 7222 | uint32_t *data_p = (uint32_t *) data; |
974c89e0 | 7223 | if (data_p[0] == match) |
0570503d PFC |
7224 | { |
7225 | *valp = data_p[1]; | |
7226 | return 1; | |
7227 | } | |
974c89e0 AH |
7228 | } |
7229 | else | |
7230 | { | |
0570503d | 7231 | uint64_t *data_p = (uint64_t *) data; |
974c89e0 | 7232 | if (data_p[0] == match) |
0570503d PFC |
7233 | { |
7234 | *valp = data_p[1]; | |
7235 | return 1; | |
7236 | } | |
974c89e0 AH |
7237 | } |
7238 | ||
7239 | offset += 2 * wordsize; | |
7240 | } | |
7241 | ||
7242 | return 0; | |
7243 | } | |
7244 | ||
7245 | /* See linux-low.h. */ | |
7246 | ||
7247 | CORE_ADDR | |
7248 | linux_get_hwcap (int wordsize) | |
7249 | { | |
0570503d PFC |
7250 | CORE_ADDR hwcap = 0; |
7251 | linux_get_auxv (wordsize, AT_HWCAP, &hwcap); | |
7252 | return hwcap; | |
974c89e0 AH |
7253 | } |
7254 | ||
7255 | /* See linux-low.h. */ | |
7256 | ||
7257 | CORE_ADDR | |
7258 | linux_get_hwcap2 (int wordsize) | |
7259 | { | |
0570503d PFC |
7260 | CORE_ADDR hwcap2 = 0; |
7261 | linux_get_auxv (wordsize, AT_HWCAP2, &hwcap2); | |
7262 | return hwcap2; | |
974c89e0 | 7263 | } |
6f69e520 | 7264 | |
3aee8918 PA |
7265 | #ifdef HAVE_LINUX_REGSETS |
7266 | void | |
7267 | initialize_regsets_info (struct regsets_info *info) | |
7268 | { | |
7269 | for (info->num_regsets = 0; | |
7270 | info->regsets[info->num_regsets].size >= 0; | |
7271 | info->num_regsets++) | |
7272 | ; | |
3aee8918 PA |
7273 | } |
7274 | #endif | |
7275 | ||
da6d8c04 DJ |
7276 | void |
7277 | initialize_low (void) | |
7278 | { | |
bd99dc85 | 7279 | struct sigaction sigchld_action; |
dd373349 | 7280 | |
bd99dc85 | 7281 | memset (&sigchld_action, 0, sizeof (sigchld_action)); |
ef0478f6 | 7282 | set_target_ops (the_linux_target); |
dd373349 | 7283 | |
aa7c7447 | 7284 | linux_ptrace_init_warnings (); |
1b919490 | 7285 | linux_proc_init_warnings (); |
bd99dc85 PA |
7286 | |
7287 | sigchld_action.sa_handler = sigchld_handler; | |
7288 | sigemptyset (&sigchld_action.sa_mask); | |
7289 | sigchld_action.sa_flags = SA_RESTART; | |
7290 | sigaction (SIGCHLD, &sigchld_action, NULL); | |
3aee8918 PA |
7291 | |
7292 | initialize_low_arch (); | |
89245bc0 DB |
7293 | |
7294 | linux_check_ptrace_features (); | |
da6d8c04 | 7295 | } |