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 | ||
82075af2 | 757 | /* This function should only be called if LWP got a SYSCALL_SIGTRAP. |
4cc32bec | 758 | Fill *SYSNO with the syscall nr trapped. */ |
82075af2 JS |
759 | |
760 | static void | |
4cc32bec | 761 | get_syscall_trapinfo (struct lwp_info *lwp, int *sysno) |
82075af2 JS |
762 | { |
763 | struct thread_info *saved_thread; | |
764 | struct regcache *regcache; | |
765 | ||
766 | if (the_low_target.get_syscall_trapinfo == NULL) | |
767 | { | |
768 | /* If we cannot get the syscall trapinfo, report an unknown | |
4cc32bec | 769 | system call number. */ |
82075af2 | 770 | *sysno = UNKNOWN_SYSCALL; |
82075af2 JS |
771 | return; |
772 | } | |
773 | ||
774 | saved_thread = current_thread; | |
775 | current_thread = get_lwp_thread (lwp); | |
776 | ||
777 | regcache = get_thread_regcache (current_thread, 1); | |
4cc32bec | 778 | (*the_low_target.get_syscall_trapinfo) (regcache, sysno); |
82075af2 JS |
779 | |
780 | if (debug_threads) | |
4cc32bec | 781 | debug_printf ("get_syscall_trapinfo sysno %d\n", *sysno); |
82075af2 JS |
782 | |
783 | current_thread = saved_thread; | |
784 | } | |
785 | ||
df95181f TBA |
786 | bool |
787 | linux_process_target::save_stop_reason (lwp_info *lwp) | |
0d62e5e8 | 788 | { |
582511be PA |
789 | CORE_ADDR pc; |
790 | CORE_ADDR sw_breakpoint_pc; | |
791 | struct thread_info *saved_thread; | |
3e572f71 PA |
792 | #if USE_SIGTRAP_SIGINFO |
793 | siginfo_t siginfo; | |
794 | #endif | |
d50171e4 | 795 | |
bf9ae9d8 | 796 | if (!low_supports_breakpoints ()) |
df95181f | 797 | return false; |
0d62e5e8 | 798 | |
582511be | 799 | pc = get_pc (lwp); |
d4807ea2 | 800 | sw_breakpoint_pc = pc - low_decr_pc_after_break (); |
d50171e4 | 801 | |
582511be PA |
802 | /* breakpoint_at reads from the current thread. */ |
803 | saved_thread = current_thread; | |
804 | current_thread = get_lwp_thread (lwp); | |
47c0c975 | 805 | |
3e572f71 PA |
806 | #if USE_SIGTRAP_SIGINFO |
807 | if (ptrace (PTRACE_GETSIGINFO, lwpid_of (current_thread), | |
808 | (PTRACE_TYPE_ARG3) 0, &siginfo) == 0) | |
809 | { | |
810 | if (siginfo.si_signo == SIGTRAP) | |
811 | { | |
e7ad2f14 PA |
812 | if (GDB_ARCH_IS_TRAP_BRKPT (siginfo.si_code) |
813 | && GDB_ARCH_IS_TRAP_HWBKPT (siginfo.si_code)) | |
3e572f71 | 814 | { |
e7ad2f14 PA |
815 | /* The si_code is ambiguous on this arch -- check debug |
816 | registers. */ | |
817 | if (!check_stopped_by_watchpoint (lwp)) | |
818 | lwp->stop_reason = TARGET_STOPPED_BY_SW_BREAKPOINT; | |
819 | } | |
820 | else if (GDB_ARCH_IS_TRAP_BRKPT (siginfo.si_code)) | |
821 | { | |
822 | /* If we determine the LWP stopped for a SW breakpoint, | |
823 | trust it. Particularly don't check watchpoint | |
824 | registers, because at least on s390, we'd find | |
825 | stopped-by-watchpoint as long as there's a watchpoint | |
826 | set. */ | |
3e572f71 | 827 | lwp->stop_reason = TARGET_STOPPED_BY_SW_BREAKPOINT; |
3e572f71 | 828 | } |
e7ad2f14 | 829 | else if (GDB_ARCH_IS_TRAP_HWBKPT (siginfo.si_code)) |
3e572f71 | 830 | { |
e7ad2f14 PA |
831 | /* This can indicate either a hardware breakpoint or |
832 | hardware watchpoint. Check debug registers. */ | |
833 | if (!check_stopped_by_watchpoint (lwp)) | |
834 | lwp->stop_reason = TARGET_STOPPED_BY_HW_BREAKPOINT; | |
3e572f71 | 835 | } |
2bf6fb9d PA |
836 | else if (siginfo.si_code == TRAP_TRACE) |
837 | { | |
e7ad2f14 PA |
838 | /* We may have single stepped an instruction that |
839 | triggered a watchpoint. In that case, on some | |
840 | architectures (such as x86), instead of TRAP_HWBKPT, | |
841 | si_code indicates TRAP_TRACE, and we need to check | |
842 | the debug registers separately. */ | |
843 | if (!check_stopped_by_watchpoint (lwp)) | |
844 | lwp->stop_reason = TARGET_STOPPED_BY_SINGLE_STEP; | |
2bf6fb9d | 845 | } |
3e572f71 PA |
846 | } |
847 | } | |
848 | #else | |
582511be PA |
849 | /* We may have just stepped a breakpoint instruction. E.g., in |
850 | non-stop mode, GDB first tells the thread A to step a range, and | |
851 | then the user inserts a breakpoint inside the range. In that | |
8090aef2 PA |
852 | case we need to report the breakpoint PC. */ |
853 | if ((!lwp->stepping || lwp->stop_pc == sw_breakpoint_pc) | |
d7146cda | 854 | && low_breakpoint_at (sw_breakpoint_pc)) |
e7ad2f14 PA |
855 | lwp->stop_reason = TARGET_STOPPED_BY_SW_BREAKPOINT; |
856 | ||
857 | if (hardware_breakpoint_inserted_here (pc)) | |
858 | lwp->stop_reason = TARGET_STOPPED_BY_HW_BREAKPOINT; | |
859 | ||
860 | if (lwp->stop_reason == TARGET_STOPPED_BY_NO_REASON) | |
861 | check_stopped_by_watchpoint (lwp); | |
862 | #endif | |
863 | ||
864 | if (lwp->stop_reason == TARGET_STOPPED_BY_SW_BREAKPOINT) | |
582511be PA |
865 | { |
866 | if (debug_threads) | |
867 | { | |
868 | struct thread_info *thr = get_lwp_thread (lwp); | |
869 | ||
870 | debug_printf ("CSBB: %s stopped by software breakpoint\n", | |
871 | target_pid_to_str (ptid_of (thr))); | |
872 | } | |
873 | ||
874 | /* Back up the PC if necessary. */ | |
875 | if (pc != sw_breakpoint_pc) | |
e7ad2f14 | 876 | { |
582511be PA |
877 | struct regcache *regcache |
878 | = get_thread_regcache (current_thread, 1); | |
bf9ae9d8 | 879 | low_set_pc (regcache, sw_breakpoint_pc); |
582511be PA |
880 | } |
881 | ||
e7ad2f14 PA |
882 | /* Update this so we record the correct stop PC below. */ |
883 | pc = sw_breakpoint_pc; | |
582511be | 884 | } |
e7ad2f14 | 885 | else if (lwp->stop_reason == TARGET_STOPPED_BY_HW_BREAKPOINT) |
582511be PA |
886 | { |
887 | if (debug_threads) | |
888 | { | |
889 | struct thread_info *thr = get_lwp_thread (lwp); | |
890 | ||
891 | debug_printf ("CSBB: %s stopped by hardware breakpoint\n", | |
892 | target_pid_to_str (ptid_of (thr))); | |
893 | } | |
e7ad2f14 PA |
894 | } |
895 | else if (lwp->stop_reason == TARGET_STOPPED_BY_WATCHPOINT) | |
896 | { | |
897 | if (debug_threads) | |
898 | { | |
899 | struct thread_info *thr = get_lwp_thread (lwp); | |
47c0c975 | 900 | |
e7ad2f14 PA |
901 | debug_printf ("CSBB: %s stopped by hardware watchpoint\n", |
902 | target_pid_to_str (ptid_of (thr))); | |
903 | } | |
582511be | 904 | } |
e7ad2f14 PA |
905 | else if (lwp->stop_reason == TARGET_STOPPED_BY_SINGLE_STEP) |
906 | { | |
907 | if (debug_threads) | |
908 | { | |
909 | struct thread_info *thr = get_lwp_thread (lwp); | |
582511be | 910 | |
e7ad2f14 PA |
911 | debug_printf ("CSBB: %s stopped by trace\n", |
912 | target_pid_to_str (ptid_of (thr))); | |
913 | } | |
914 | } | |
915 | ||
916 | lwp->stop_pc = pc; | |
582511be | 917 | current_thread = saved_thread; |
df95181f | 918 | return true; |
0d62e5e8 | 919 | } |
ce3a066d | 920 | |
fd000fb3 TBA |
921 | lwp_info * |
922 | linux_process_target::add_lwp (ptid_t ptid) | |
611cb4a5 | 923 | { |
54a0b537 | 924 | struct lwp_info *lwp; |
0d62e5e8 | 925 | |
8d749320 | 926 | lwp = XCNEW (struct lwp_info); |
00db26fa PA |
927 | |
928 | lwp->waitstatus.kind = TARGET_WAITKIND_IGNORE; | |
0d62e5e8 | 929 | |
754e3168 AH |
930 | lwp->thread = add_thread (ptid, lwp); |
931 | ||
fd000fb3 | 932 | low_new_thread (lwp); |
aa5ca48f | 933 | |
54a0b537 | 934 | return lwp; |
0d62e5e8 | 935 | } |
611cb4a5 | 936 | |
fd000fb3 TBA |
937 | void |
938 | linux_process_target::low_new_thread (lwp_info *info) | |
939 | { | |
940 | /* Nop. */ | |
941 | } | |
942 | ||
2090129c SDJ |
943 | /* Callback to be used when calling fork_inferior, responsible for |
944 | actually initiating the tracing of the inferior. */ | |
945 | ||
946 | static void | |
947 | linux_ptrace_fun () | |
948 | { | |
949 | if (ptrace (PTRACE_TRACEME, 0, (PTRACE_TYPE_ARG3) 0, | |
950 | (PTRACE_TYPE_ARG4) 0) < 0) | |
50fa3001 | 951 | trace_start_error_with_name ("ptrace"); |
2090129c SDJ |
952 | |
953 | if (setpgid (0, 0) < 0) | |
954 | trace_start_error_with_name ("setpgid"); | |
955 | ||
956 | /* If GDBserver is connected to gdb via stdio, redirect the inferior's | |
957 | stdout to stderr so that inferior i/o doesn't corrupt the connection. | |
958 | Also, redirect stdin to /dev/null. */ | |
959 | if (remote_connection_is_stdio ()) | |
960 | { | |
961 | if (close (0) < 0) | |
962 | trace_start_error_with_name ("close"); | |
963 | if (open ("/dev/null", O_RDONLY) < 0) | |
964 | trace_start_error_with_name ("open"); | |
965 | if (dup2 (2, 1) < 0) | |
966 | trace_start_error_with_name ("dup2"); | |
967 | if (write (2, "stdin/stdout redirected\n", | |
968 | sizeof ("stdin/stdout redirected\n") - 1) < 0) | |
969 | { | |
970 | /* Errors ignored. */; | |
971 | } | |
972 | } | |
973 | } | |
974 | ||
da6d8c04 | 975 | /* Start an inferior process and returns its pid. |
2090129c SDJ |
976 | PROGRAM is the name of the program to be started, and PROGRAM_ARGS |
977 | are its arguments. */ | |
da6d8c04 | 978 | |
15295543 TBA |
979 | int |
980 | linux_process_target::create_inferior (const char *program, | |
981 | const std::vector<char *> &program_args) | |
da6d8c04 | 982 | { |
c12a5089 | 983 | client_state &cs = get_client_state (); |
a6dbe5df | 984 | struct lwp_info *new_lwp; |
da6d8c04 | 985 | int pid; |
95954743 | 986 | ptid_t ptid; |
03583c20 | 987 | |
41272101 TT |
988 | { |
989 | maybe_disable_address_space_randomization restore_personality | |
c12a5089 | 990 | (cs.disable_randomization); |
41272101 TT |
991 | std::string str_program_args = stringify_argv (program_args); |
992 | ||
993 | pid = fork_inferior (program, | |
994 | str_program_args.c_str (), | |
995 | get_environ ()->envp (), linux_ptrace_fun, | |
996 | NULL, NULL, NULL, NULL); | |
997 | } | |
03583c20 | 998 | |
fd000fb3 | 999 | add_linux_process (pid, 0); |
95954743 | 1000 | |
fd79271b | 1001 | ptid = ptid_t (pid, pid, 0); |
95954743 | 1002 | new_lwp = add_lwp (ptid); |
a6dbe5df | 1003 | new_lwp->must_set_ptrace_flags = 1; |
611cb4a5 | 1004 | |
2090129c SDJ |
1005 | post_fork_inferior (pid, program); |
1006 | ||
a9fa9f7d | 1007 | return pid; |
da6d8c04 DJ |
1008 | } |
1009 | ||
ece66d65 JS |
1010 | /* Implement the post_create_inferior target_ops method. */ |
1011 | ||
6dee9afb TBA |
1012 | void |
1013 | linux_process_target::post_create_inferior () | |
ece66d65 JS |
1014 | { |
1015 | struct lwp_info *lwp = get_thread_lwp (current_thread); | |
1016 | ||
797bcff5 | 1017 | low_arch_setup (); |
ece66d65 JS |
1018 | |
1019 | if (lwp->must_set_ptrace_flags) | |
1020 | { | |
1021 | struct process_info *proc = current_process (); | |
1022 | int options = linux_low_ptrace_options (proc->attached); | |
1023 | ||
1024 | linux_enable_event_reporting (lwpid_of (current_thread), options); | |
1025 | lwp->must_set_ptrace_flags = 0; | |
1026 | } | |
1027 | } | |
1028 | ||
7ae1a6a6 | 1029 | int |
fd000fb3 | 1030 | linux_process_target::attach_lwp (ptid_t ptid) |
da6d8c04 | 1031 | { |
54a0b537 | 1032 | struct lwp_info *new_lwp; |
e38504b3 | 1033 | int lwpid = ptid.lwp (); |
611cb4a5 | 1034 | |
b8e1b30e | 1035 | if (ptrace (PTRACE_ATTACH, lwpid, (PTRACE_TYPE_ARG3) 0, (PTRACE_TYPE_ARG4) 0) |
56f7af9c | 1036 | != 0) |
7ae1a6a6 | 1037 | return errno; |
24a09b5f | 1038 | |
b3312d80 | 1039 | new_lwp = add_lwp (ptid); |
0d62e5e8 | 1040 | |
a6dbe5df PA |
1041 | /* We need to wait for SIGSTOP before being able to make the next |
1042 | ptrace call on this LWP. */ | |
1043 | new_lwp->must_set_ptrace_flags = 1; | |
1044 | ||
644cebc9 | 1045 | if (linux_proc_pid_is_stopped (lwpid)) |
c14d7ab2 PA |
1046 | { |
1047 | if (debug_threads) | |
87ce2a04 | 1048 | debug_printf ("Attached to a stopped process\n"); |
c14d7ab2 PA |
1049 | |
1050 | /* The process is definitely stopped. It is in a job control | |
1051 | stop, unless the kernel predates the TASK_STOPPED / | |
1052 | TASK_TRACED distinction, in which case it might be in a | |
1053 | ptrace stop. Make sure it is in a ptrace stop; from there we | |
1054 | can kill it, signal it, et cetera. | |
1055 | ||
1056 | First make sure there is a pending SIGSTOP. Since we are | |
1057 | already attached, the process can not transition from stopped | |
1058 | to running without a PTRACE_CONT; so we know this signal will | |
1059 | go into the queue. The SIGSTOP generated by PTRACE_ATTACH is | |
1060 | probably already in the queue (unless this kernel is old | |
1061 | enough to use TASK_STOPPED for ptrace stops); but since | |
1062 | SIGSTOP is not an RT signal, it can only be queued once. */ | |
1063 | kill_lwp (lwpid, SIGSTOP); | |
1064 | ||
1065 | /* Finally, resume the stopped process. This will deliver the | |
1066 | SIGSTOP (or a higher priority signal, just like normal | |
1067 | PTRACE_ATTACH), which we'll catch later on. */ | |
b8e1b30e | 1068 | ptrace (PTRACE_CONT, lwpid, (PTRACE_TYPE_ARG3) 0, (PTRACE_TYPE_ARG4) 0); |
c14d7ab2 PA |
1069 | } |
1070 | ||
0d62e5e8 | 1071 | /* The next time we wait for this LWP we'll see a SIGSTOP as PTRACE_ATTACH |
0e21c1ec DE |
1072 | brings it to a halt. |
1073 | ||
1074 | There are several cases to consider here: | |
1075 | ||
1076 | 1) gdbserver has already attached to the process and is being notified | |
1b3f6016 | 1077 | of a new thread that is being created. |
d50171e4 PA |
1078 | In this case we should ignore that SIGSTOP and resume the |
1079 | process. This is handled below by setting stop_expected = 1, | |
8336d594 | 1080 | and the fact that add_thread sets last_resume_kind == |
d50171e4 | 1081 | resume_continue. |
0e21c1ec DE |
1082 | |
1083 | 2) This is the first thread (the process thread), and we're attaching | |
1b3f6016 PA |
1084 | to it via attach_inferior. |
1085 | In this case we want the process thread to stop. | |
d50171e4 PA |
1086 | This is handled by having linux_attach set last_resume_kind == |
1087 | resume_stop after we return. | |
e3deef73 LM |
1088 | |
1089 | If the pid we are attaching to is also the tgid, we attach to and | |
1090 | stop all the existing threads. Otherwise, we attach to pid and | |
1091 | ignore any other threads in the same group as this pid. | |
0e21c1ec DE |
1092 | |
1093 | 3) GDB is connecting to gdbserver and is requesting an enumeration of all | |
1b3f6016 PA |
1094 | existing threads. |
1095 | In this case we want the thread to stop. | |
1096 | FIXME: This case is currently not properly handled. | |
1097 | We should wait for the SIGSTOP but don't. Things work apparently | |
1098 | because enough time passes between when we ptrace (ATTACH) and when | |
1099 | gdb makes the next ptrace call on the thread. | |
0d62e5e8 DJ |
1100 | |
1101 | On the other hand, if we are currently trying to stop all threads, we | |
1102 | should treat the new thread as if we had sent it a SIGSTOP. This works | |
54a0b537 | 1103 | because we are guaranteed that the add_lwp call above added us to the |
0e21c1ec DE |
1104 | end of the list, and so the new thread has not yet reached |
1105 | wait_for_sigstop (but will). */ | |
d50171e4 | 1106 | new_lwp->stop_expected = 1; |
0d62e5e8 | 1107 | |
7ae1a6a6 | 1108 | return 0; |
95954743 PA |
1109 | } |
1110 | ||
8784d563 PA |
1111 | /* Callback for linux_proc_attach_tgid_threads. Attach to PTID if not |
1112 | already attached. Returns true if a new LWP is found, false | |
1113 | otherwise. */ | |
1114 | ||
1115 | static int | |
1116 | attach_proc_task_lwp_callback (ptid_t ptid) | |
1117 | { | |
1118 | /* Is this a new thread? */ | |
1119 | if (find_thread_ptid (ptid) == NULL) | |
1120 | { | |
e38504b3 | 1121 | int lwpid = ptid.lwp (); |
8784d563 PA |
1122 | int err; |
1123 | ||
1124 | if (debug_threads) | |
1125 | debug_printf ("Found new lwp %d\n", lwpid); | |
1126 | ||
fd000fb3 | 1127 | err = the_linux_target->attach_lwp (ptid); |
8784d563 PA |
1128 | |
1129 | /* Be quiet if we simply raced with the thread exiting. EPERM | |
1130 | is returned if the thread's task still exists, and is marked | |
1131 | as exited or zombie, as well as other conditions, so in that | |
1132 | case, confirm the status in /proc/PID/status. */ | |
1133 | if (err == ESRCH | |
1134 | || (err == EPERM && linux_proc_pid_is_gone (lwpid))) | |
1135 | { | |
1136 | if (debug_threads) | |
1137 | { | |
1138 | debug_printf ("Cannot attach to lwp %d: " | |
1139 | "thread is gone (%d: %s)\n", | |
6d91ce9a | 1140 | lwpid, err, safe_strerror (err)); |
8784d563 PA |
1141 | } |
1142 | } | |
1143 | else if (err != 0) | |
1144 | { | |
4d9b86e1 | 1145 | std::string reason |
50fa3001 | 1146 | = linux_ptrace_attach_fail_reason_string (ptid, err); |
4d9b86e1 SM |
1147 | |
1148 | warning (_("Cannot attach to lwp %d: %s"), lwpid, reason.c_str ()); | |
8784d563 PA |
1149 | } |
1150 | ||
1151 | return 1; | |
1152 | } | |
1153 | return 0; | |
1154 | } | |
1155 | ||
500c1d85 PA |
1156 | static void async_file_mark (void); |
1157 | ||
e3deef73 LM |
1158 | /* Attach to PID. If PID is the tgid, attach to it and all |
1159 | of its threads. */ | |
1160 | ||
ef03dad8 TBA |
1161 | int |
1162 | linux_process_target::attach (unsigned long pid) | |
0d62e5e8 | 1163 | { |
500c1d85 PA |
1164 | struct process_info *proc; |
1165 | struct thread_info *initial_thread; | |
fd79271b | 1166 | ptid_t ptid = ptid_t (pid, pid, 0); |
7ae1a6a6 PA |
1167 | int err; |
1168 | ||
fd000fb3 | 1169 | proc = add_linux_process (pid, 1); |
df0da8a2 | 1170 | |
e3deef73 LM |
1171 | /* Attach to PID. We will check for other threads |
1172 | soon. */ | |
fd000fb3 | 1173 | err = attach_lwp (ptid); |
7ae1a6a6 | 1174 | if (err != 0) |
4d9b86e1 | 1175 | { |
df0da8a2 | 1176 | remove_process (proc); |
4d9b86e1 | 1177 | |
50fa3001 SDJ |
1178 | std::string reason = linux_ptrace_attach_fail_reason_string (ptid, err); |
1179 | error ("Cannot attach to process %ld: %s", pid, reason.c_str ()); | |
4d9b86e1 | 1180 | } |
7ae1a6a6 | 1181 | |
500c1d85 PA |
1182 | /* Don't ignore the initial SIGSTOP if we just attached to this |
1183 | process. It will be collected by wait shortly. */ | |
fd79271b | 1184 | initial_thread = find_thread_ptid (ptid_t (pid, pid, 0)); |
500c1d85 | 1185 | initial_thread->last_resume_kind = resume_stop; |
0d62e5e8 | 1186 | |
8784d563 PA |
1187 | /* We must attach to every LWP. If /proc is mounted, use that to |
1188 | find them now. On the one hand, the inferior may be using raw | |
1189 | clone instead of using pthreads. On the other hand, even if it | |
1190 | is using pthreads, GDB may not be connected yet (thread_db needs | |
1191 | to do symbol lookups, through qSymbol). Also, thread_db walks | |
1192 | structures in the inferior's address space to find the list of | |
1193 | threads/LWPs, and those structures may well be corrupted. Note | |
1194 | that once thread_db is loaded, we'll still use it to list threads | |
1195 | and associate pthread info with each LWP. */ | |
1196 | linux_proc_attach_tgid_threads (pid, attach_proc_task_lwp_callback); | |
500c1d85 PA |
1197 | |
1198 | /* GDB will shortly read the xml target description for this | |
1199 | process, to figure out the process' architecture. But the target | |
1200 | description is only filled in when the first process/thread in | |
1201 | the thread group reports its initial PTRACE_ATTACH SIGSTOP. Do | |
1202 | that now, otherwise, if GDB is fast enough, it could read the | |
1203 | target description _before_ that initial stop. */ | |
1204 | if (non_stop) | |
1205 | { | |
1206 | struct lwp_info *lwp; | |
1207 | int wstat, lwpid; | |
f2907e49 | 1208 | ptid_t pid_ptid = ptid_t (pid); |
500c1d85 | 1209 | |
d16f3f6c | 1210 | lwpid = wait_for_event_filtered (pid_ptid, pid_ptid, &wstat, __WALL); |
500c1d85 PA |
1211 | gdb_assert (lwpid > 0); |
1212 | ||
f2907e49 | 1213 | lwp = find_lwp_pid (ptid_t (lwpid)); |
500c1d85 PA |
1214 | |
1215 | if (!WIFSTOPPED (wstat) || WSTOPSIG (wstat) != SIGSTOP) | |
1216 | { | |
1217 | lwp->status_pending_p = 1; | |
1218 | lwp->status_pending = wstat; | |
1219 | } | |
1220 | ||
1221 | initial_thread->last_resume_kind = resume_continue; | |
1222 | ||
1223 | async_file_mark (); | |
1224 | ||
1225 | gdb_assert (proc->tdesc != NULL); | |
1226 | } | |
1227 | ||
95954743 PA |
1228 | return 0; |
1229 | } | |
1230 | ||
95954743 | 1231 | static int |
e4eb0dec | 1232 | last_thread_of_process_p (int pid) |
95954743 | 1233 | { |
e4eb0dec | 1234 | bool seen_one = false; |
95954743 | 1235 | |
da4ae14a | 1236 | thread_info *thread = find_thread (pid, [&] (thread_info *thr_arg) |
95954743 | 1237 | { |
e4eb0dec SM |
1238 | if (!seen_one) |
1239 | { | |
1240 | /* This is the first thread of this process we see. */ | |
1241 | seen_one = true; | |
1242 | return false; | |
1243 | } | |
1244 | else | |
1245 | { | |
1246 | /* This is the second thread of this process we see. */ | |
1247 | return true; | |
1248 | } | |
1249 | }); | |
da6d8c04 | 1250 | |
e4eb0dec | 1251 | return thread == NULL; |
95954743 PA |
1252 | } |
1253 | ||
da84f473 PA |
1254 | /* Kill LWP. */ |
1255 | ||
1256 | static void | |
1257 | linux_kill_one_lwp (struct lwp_info *lwp) | |
1258 | { | |
d86d4aaf DE |
1259 | struct thread_info *thr = get_lwp_thread (lwp); |
1260 | int pid = lwpid_of (thr); | |
da84f473 PA |
1261 | |
1262 | /* PTRACE_KILL is unreliable. After stepping into a signal handler, | |
1263 | there is no signal context, and ptrace(PTRACE_KILL) (or | |
1264 | ptrace(PTRACE_CONT, SIGKILL), pretty much the same) acts like | |
1265 | ptrace(CONT, pid, 0,0) and just resumes the tracee. A better | |
1266 | alternative is to kill with SIGKILL. We only need one SIGKILL | |
1267 | per process, not one for each thread. But since we still support | |
4a6ed09b PA |
1268 | support debugging programs using raw clone without CLONE_THREAD, |
1269 | we send one for each thread. For years, we used PTRACE_KILL | |
1270 | only, so we're being a bit paranoid about some old kernels where | |
1271 | PTRACE_KILL might work better (dubious if there are any such, but | |
1272 | that's why it's paranoia), so we try SIGKILL first, PTRACE_KILL | |
1273 | second, and so we're fine everywhere. */ | |
da84f473 PA |
1274 | |
1275 | errno = 0; | |
69ff6be5 | 1276 | kill_lwp (pid, SIGKILL); |
da84f473 | 1277 | if (debug_threads) |
ce9e3fe7 PA |
1278 | { |
1279 | int save_errno = errno; | |
1280 | ||
1281 | debug_printf ("LKL: kill_lwp (SIGKILL) %s, 0, 0 (%s)\n", | |
1282 | target_pid_to_str (ptid_of (thr)), | |
6d91ce9a | 1283 | save_errno ? safe_strerror (save_errno) : "OK"); |
ce9e3fe7 | 1284 | } |
da84f473 PA |
1285 | |
1286 | errno = 0; | |
b8e1b30e | 1287 | ptrace (PTRACE_KILL, pid, (PTRACE_TYPE_ARG3) 0, (PTRACE_TYPE_ARG4) 0); |
da84f473 | 1288 | if (debug_threads) |
ce9e3fe7 PA |
1289 | { |
1290 | int save_errno = errno; | |
1291 | ||
1292 | debug_printf ("LKL: PTRACE_KILL %s, 0, 0 (%s)\n", | |
1293 | target_pid_to_str (ptid_of (thr)), | |
6d91ce9a | 1294 | save_errno ? safe_strerror (save_errno) : "OK"); |
ce9e3fe7 | 1295 | } |
da84f473 PA |
1296 | } |
1297 | ||
e76126e8 PA |
1298 | /* Kill LWP and wait for it to die. */ |
1299 | ||
1300 | static void | |
1301 | kill_wait_lwp (struct lwp_info *lwp) | |
1302 | { | |
1303 | struct thread_info *thr = get_lwp_thread (lwp); | |
e99b03dc | 1304 | int pid = ptid_of (thr).pid (); |
e38504b3 | 1305 | int lwpid = ptid_of (thr).lwp (); |
e76126e8 PA |
1306 | int wstat; |
1307 | int res; | |
1308 | ||
1309 | if (debug_threads) | |
1310 | debug_printf ("kwl: killing lwp %d, for pid: %d\n", lwpid, pid); | |
1311 | ||
1312 | do | |
1313 | { | |
1314 | linux_kill_one_lwp (lwp); | |
1315 | ||
1316 | /* Make sure it died. Notes: | |
1317 | ||
1318 | - The loop is most likely unnecessary. | |
1319 | ||
d16f3f6c | 1320 | - We don't use wait_for_event as that could delete lwps |
e76126e8 PA |
1321 | while we're iterating over them. We're not interested in |
1322 | any pending status at this point, only in making sure all | |
1323 | wait status on the kernel side are collected until the | |
1324 | process is reaped. | |
1325 | ||
1326 | - We don't use __WALL here as the __WALL emulation relies on | |
1327 | SIGCHLD, and killing a stopped process doesn't generate | |
1328 | one, nor an exit status. | |
1329 | */ | |
1330 | res = my_waitpid (lwpid, &wstat, 0); | |
1331 | if (res == -1 && errno == ECHILD) | |
1332 | res = my_waitpid (lwpid, &wstat, __WCLONE); | |
1333 | } while (res > 0 && WIFSTOPPED (wstat)); | |
1334 | ||
586b02a9 PA |
1335 | /* Even if it was stopped, the child may have already disappeared. |
1336 | E.g., if it was killed by SIGKILL. */ | |
1337 | if (res < 0 && errno != ECHILD) | |
1338 | perror_with_name ("kill_wait_lwp"); | |
e76126e8 PA |
1339 | } |
1340 | ||
578290ec | 1341 | /* Callback for `for_each_thread'. Kills an lwp of a given process, |
da84f473 | 1342 | except the leader. */ |
95954743 | 1343 | |
578290ec SM |
1344 | static void |
1345 | kill_one_lwp_callback (thread_info *thread, int pid) | |
da6d8c04 | 1346 | { |
54a0b537 | 1347 | struct lwp_info *lwp = get_thread_lwp (thread); |
0d62e5e8 | 1348 | |
fd500816 DJ |
1349 | /* We avoid killing the first thread here, because of a Linux kernel (at |
1350 | least 2.6.0-test7 through 2.6.8-rc4) bug; if we kill the parent before | |
1351 | the children get a chance to be reaped, it will remain a zombie | |
1352 | forever. */ | |
95954743 | 1353 | |
d86d4aaf | 1354 | if (lwpid_of (thread) == pid) |
95954743 PA |
1355 | { |
1356 | if (debug_threads) | |
87ce2a04 | 1357 | debug_printf ("lkop: is last of process %s\n", |
9c80ecd6 | 1358 | target_pid_to_str (thread->id)); |
578290ec | 1359 | return; |
95954743 | 1360 | } |
fd500816 | 1361 | |
e76126e8 | 1362 | kill_wait_lwp (lwp); |
da6d8c04 DJ |
1363 | } |
1364 | ||
c6885a57 TBA |
1365 | int |
1366 | linux_process_target::kill (process_info *process) | |
0d62e5e8 | 1367 | { |
a780ef4f | 1368 | int pid = process->pid; |
9d606399 | 1369 | |
f9e39928 PA |
1370 | /* If we're killing a running inferior, make sure it is stopped |
1371 | first, as PTRACE_KILL will not work otherwise. */ | |
7984d532 | 1372 | stop_all_lwps (0, NULL); |
f9e39928 | 1373 | |
578290ec SM |
1374 | for_each_thread (pid, [&] (thread_info *thread) |
1375 | { | |
1376 | kill_one_lwp_callback (thread, pid); | |
1377 | }); | |
fd500816 | 1378 | |
54a0b537 | 1379 | /* See the comment in linux_kill_one_lwp. We did not kill the first |
fd500816 | 1380 | thread in the list, so do so now. */ |
a780ef4f | 1381 | lwp_info *lwp = find_lwp_pid (ptid_t (pid)); |
bd99dc85 | 1382 | |
784867a5 | 1383 | if (lwp == NULL) |
fd500816 | 1384 | { |
784867a5 | 1385 | if (debug_threads) |
d86d4aaf DE |
1386 | debug_printf ("lk_1: cannot find lwp for pid: %d\n", |
1387 | pid); | |
784867a5 JK |
1388 | } |
1389 | else | |
e76126e8 | 1390 | kill_wait_lwp (lwp); |
2d717e4f | 1391 | |
8adb37b9 | 1392 | mourn (process); |
f9e39928 PA |
1393 | |
1394 | /* Since we presently can only stop all lwps of all processes, we | |
1395 | need to unstop lwps of other processes. */ | |
7984d532 | 1396 | unstop_all_lwps (0, NULL); |
95954743 | 1397 | return 0; |
0d62e5e8 DJ |
1398 | } |
1399 | ||
9b224c5e PA |
1400 | /* Get pending signal of THREAD, for detaching purposes. This is the |
1401 | signal the thread last stopped for, which we need to deliver to the | |
1402 | thread when detaching, otherwise, it'd be suppressed/lost. */ | |
1403 | ||
1404 | static int | |
1405 | get_detach_signal (struct thread_info *thread) | |
1406 | { | |
c12a5089 | 1407 | client_state &cs = get_client_state (); |
a493e3e2 | 1408 | enum gdb_signal signo = GDB_SIGNAL_0; |
9b224c5e PA |
1409 | int status; |
1410 | struct lwp_info *lp = get_thread_lwp (thread); | |
1411 | ||
1412 | if (lp->status_pending_p) | |
1413 | status = lp->status_pending; | |
1414 | else | |
1415 | { | |
1416 | /* If the thread had been suspended by gdbserver, and it stopped | |
1417 | cleanly, then it'll have stopped with SIGSTOP. But we don't | |
1418 | want to deliver that SIGSTOP. */ | |
1419 | if (thread->last_status.kind != TARGET_WAITKIND_STOPPED | |
a493e3e2 | 1420 | || thread->last_status.value.sig == GDB_SIGNAL_0) |
9b224c5e PA |
1421 | return 0; |
1422 | ||
1423 | /* Otherwise, we may need to deliver the signal we | |
1424 | intercepted. */ | |
1425 | status = lp->last_status; | |
1426 | } | |
1427 | ||
1428 | if (!WIFSTOPPED (status)) | |
1429 | { | |
1430 | if (debug_threads) | |
87ce2a04 | 1431 | debug_printf ("GPS: lwp %s hasn't stopped: no pending signal\n", |
d86d4aaf | 1432 | target_pid_to_str (ptid_of (thread))); |
9b224c5e PA |
1433 | return 0; |
1434 | } | |
1435 | ||
1436 | /* Extended wait statuses aren't real SIGTRAPs. */ | |
89a5711c | 1437 | if (WSTOPSIG (status) == SIGTRAP && linux_is_extended_waitstatus (status)) |
9b224c5e PA |
1438 | { |
1439 | if (debug_threads) | |
87ce2a04 DE |
1440 | debug_printf ("GPS: lwp %s had stopped with extended " |
1441 | "status: no pending signal\n", | |
d86d4aaf | 1442 | target_pid_to_str (ptid_of (thread))); |
9b224c5e PA |
1443 | return 0; |
1444 | } | |
1445 | ||
2ea28649 | 1446 | signo = gdb_signal_from_host (WSTOPSIG (status)); |
9b224c5e | 1447 | |
c12a5089 | 1448 | if (cs.program_signals_p && !cs.program_signals[signo]) |
9b224c5e PA |
1449 | { |
1450 | if (debug_threads) | |
87ce2a04 | 1451 | debug_printf ("GPS: lwp %s had signal %s, but it is in nopass state\n", |
d86d4aaf | 1452 | target_pid_to_str (ptid_of (thread)), |
87ce2a04 | 1453 | gdb_signal_to_string (signo)); |
9b224c5e PA |
1454 | return 0; |
1455 | } | |
c12a5089 | 1456 | else if (!cs.program_signals_p |
9b224c5e PA |
1457 | /* If we have no way to know which signals GDB does not |
1458 | want to have passed to the program, assume | |
1459 | SIGTRAP/SIGINT, which is GDB's default. */ | |
a493e3e2 | 1460 | && (signo == GDB_SIGNAL_TRAP || signo == GDB_SIGNAL_INT)) |
9b224c5e PA |
1461 | { |
1462 | if (debug_threads) | |
87ce2a04 DE |
1463 | debug_printf ("GPS: lwp %s had signal %s, " |
1464 | "but we don't know if we should pass it. " | |
1465 | "Default to not.\n", | |
d86d4aaf | 1466 | target_pid_to_str (ptid_of (thread)), |
87ce2a04 | 1467 | gdb_signal_to_string (signo)); |
9b224c5e PA |
1468 | return 0; |
1469 | } | |
1470 | else | |
1471 | { | |
1472 | if (debug_threads) | |
87ce2a04 | 1473 | debug_printf ("GPS: lwp %s has pending signal %s: delivering it.\n", |
d86d4aaf | 1474 | target_pid_to_str (ptid_of (thread)), |
87ce2a04 | 1475 | gdb_signal_to_string (signo)); |
9b224c5e PA |
1476 | |
1477 | return WSTOPSIG (status); | |
1478 | } | |
1479 | } | |
1480 | ||
fd000fb3 TBA |
1481 | void |
1482 | linux_process_target::detach_one_lwp (lwp_info *lwp) | |
6ad8ae5c | 1483 | { |
ced2dffb | 1484 | struct thread_info *thread = get_lwp_thread (lwp); |
9b224c5e | 1485 | int sig; |
ced2dffb | 1486 | int lwpid; |
6ad8ae5c | 1487 | |
9b224c5e | 1488 | /* If there is a pending SIGSTOP, get rid of it. */ |
54a0b537 | 1489 | if (lwp->stop_expected) |
ae13219e | 1490 | { |
9b224c5e | 1491 | if (debug_threads) |
87ce2a04 | 1492 | debug_printf ("Sending SIGCONT to %s\n", |
d86d4aaf | 1493 | target_pid_to_str (ptid_of (thread))); |
9b224c5e | 1494 | |
d86d4aaf | 1495 | kill_lwp (lwpid_of (thread), SIGCONT); |
54a0b537 | 1496 | lwp->stop_expected = 0; |
ae13219e DJ |
1497 | } |
1498 | ||
9b224c5e PA |
1499 | /* Pass on any pending signal for this thread. */ |
1500 | sig = get_detach_signal (thread); | |
1501 | ||
ced2dffb PA |
1502 | /* Preparing to resume may try to write registers, and fail if the |
1503 | lwp is zombie. If that happens, ignore the error. We'll handle | |
1504 | it below, when detach fails with ESRCH. */ | |
a70b8144 | 1505 | try |
ced2dffb PA |
1506 | { |
1507 | /* Flush any pending changes to the process's registers. */ | |
1508 | regcache_invalidate_thread (thread); | |
1509 | ||
1510 | /* Finally, let it resume. */ | |
d7599cc0 | 1511 | low_prepare_to_resume (lwp); |
ced2dffb | 1512 | } |
230d2906 | 1513 | catch (const gdb_exception_error &ex) |
ced2dffb PA |
1514 | { |
1515 | if (!check_ptrace_stopped_lwp_gone (lwp)) | |
eedc3f4f | 1516 | throw; |
ced2dffb | 1517 | } |
ced2dffb PA |
1518 | |
1519 | lwpid = lwpid_of (thread); | |
1520 | if (ptrace (PTRACE_DETACH, lwpid, (PTRACE_TYPE_ARG3) 0, | |
b8e1b30e | 1521 | (PTRACE_TYPE_ARG4) (long) sig) < 0) |
ced2dffb PA |
1522 | { |
1523 | int save_errno = errno; | |
1524 | ||
1525 | /* We know the thread exists, so ESRCH must mean the lwp is | |
1526 | zombie. This can happen if one of the already-detached | |
1527 | threads exits the whole thread group. In that case we're | |
1528 | still attached, and must reap the lwp. */ | |
1529 | if (save_errno == ESRCH) | |
1530 | { | |
1531 | int ret, status; | |
1532 | ||
1533 | ret = my_waitpid (lwpid, &status, __WALL); | |
1534 | if (ret == -1) | |
1535 | { | |
1536 | warning (_("Couldn't reap LWP %d while detaching: %s"), | |
6d91ce9a | 1537 | lwpid, safe_strerror (errno)); |
ced2dffb PA |
1538 | } |
1539 | else if (!WIFEXITED (status) && !WIFSIGNALED (status)) | |
1540 | { | |
1541 | warning (_("Reaping LWP %d while detaching " | |
1542 | "returned unexpected status 0x%x"), | |
1543 | lwpid, status); | |
1544 | } | |
1545 | } | |
1546 | else | |
1547 | { | |
1548 | error (_("Can't detach %s: %s"), | |
1549 | target_pid_to_str (ptid_of (thread)), | |
6d91ce9a | 1550 | safe_strerror (save_errno)); |
ced2dffb PA |
1551 | } |
1552 | } | |
1553 | else if (debug_threads) | |
1554 | { | |
1555 | debug_printf ("PTRACE_DETACH (%s, %s, 0) (OK)\n", | |
1556 | target_pid_to_str (ptid_of (thread)), | |
1557 | strsignal (sig)); | |
1558 | } | |
bd99dc85 PA |
1559 | |
1560 | delete_lwp (lwp); | |
ced2dffb PA |
1561 | } |
1562 | ||
9061c9cf TBA |
1563 | int |
1564 | linux_process_target::detach (process_info *process) | |
95954743 | 1565 | { |
ced2dffb | 1566 | struct lwp_info *main_lwp; |
95954743 | 1567 | |
863d01bd PA |
1568 | /* As there's a step over already in progress, let it finish first, |
1569 | otherwise nesting a stabilize_threads operation on top gets real | |
1570 | messy. */ | |
1571 | complete_ongoing_step_over (); | |
1572 | ||
f9e39928 | 1573 | /* Stop all threads before detaching. First, ptrace requires that |
30baf67b | 1574 | the thread is stopped to successfully detach. Second, thread_db |
f9e39928 PA |
1575 | may need to uninstall thread event breakpoints from memory, which |
1576 | only works with a stopped process anyway. */ | |
7984d532 | 1577 | stop_all_lwps (0, NULL); |
f9e39928 | 1578 | |
ca5c370d | 1579 | #ifdef USE_THREAD_DB |
8336d594 | 1580 | thread_db_detach (process); |
ca5c370d PA |
1581 | #endif |
1582 | ||
fa593d66 | 1583 | /* Stabilize threads (move out of jump pads). */ |
5c9eb2f2 | 1584 | target_stabilize_threads (); |
fa593d66 | 1585 | |
ced2dffb PA |
1586 | /* Detach from the clone lwps first. If the thread group exits just |
1587 | while we're detaching, we must reap the clone lwps before we're | |
1588 | able to reap the leader. */ | |
fd000fb3 TBA |
1589 | for_each_thread (process->pid, [this] (thread_info *thread) |
1590 | { | |
1591 | /* We don't actually detach from the thread group leader just yet. | |
1592 | If the thread group exits, we must reap the zombie clone lwps | |
1593 | before we're able to reap the leader. */ | |
1594 | if (thread->id.pid () == thread->id.lwp ()) | |
1595 | return; | |
1596 | ||
1597 | lwp_info *lwp = get_thread_lwp (thread); | |
1598 | detach_one_lwp (lwp); | |
1599 | }); | |
ced2dffb | 1600 | |
ef2ddb33 | 1601 | main_lwp = find_lwp_pid (ptid_t (process->pid)); |
fd000fb3 | 1602 | detach_one_lwp (main_lwp); |
8336d594 | 1603 | |
8adb37b9 | 1604 | mourn (process); |
f9e39928 PA |
1605 | |
1606 | /* Since we presently can only stop all lwps of all processes, we | |
1607 | need to unstop lwps of other processes. */ | |
7984d532 | 1608 | unstop_all_lwps (0, NULL); |
f9e39928 PA |
1609 | return 0; |
1610 | } | |
1611 | ||
1612 | /* Remove all LWPs that belong to process PROC from the lwp list. */ | |
1613 | ||
8adb37b9 TBA |
1614 | void |
1615 | linux_process_target::mourn (process_info *process) | |
8336d594 PA |
1616 | { |
1617 | struct process_info_private *priv; | |
1618 | ||
1619 | #ifdef USE_THREAD_DB | |
1620 | thread_db_mourn (process); | |
1621 | #endif | |
1622 | ||
fd000fb3 | 1623 | for_each_thread (process->pid, [this] (thread_info *thread) |
6b2a85da SM |
1624 | { |
1625 | delete_lwp (get_thread_lwp (thread)); | |
1626 | }); | |
f9e39928 | 1627 | |
8336d594 | 1628 | /* Freeing all private data. */ |
fe978cb0 | 1629 | priv = process->priv; |
fd000fb3 | 1630 | low_delete_process (priv->arch_private); |
8336d594 | 1631 | free (priv); |
fe978cb0 | 1632 | process->priv = NULL; |
505106cd PA |
1633 | |
1634 | remove_process (process); | |
8336d594 PA |
1635 | } |
1636 | ||
95a49a39 TBA |
1637 | void |
1638 | linux_process_target::join (int pid) | |
444d6139 | 1639 | { |
444d6139 PA |
1640 | int status, ret; |
1641 | ||
1642 | do { | |
d105de22 | 1643 | ret = my_waitpid (pid, &status, 0); |
444d6139 PA |
1644 | if (WIFEXITED (status) || WIFSIGNALED (status)) |
1645 | break; | |
1646 | } while (ret != -1 || errno != ECHILD); | |
1647 | } | |
1648 | ||
13d3d99b TBA |
1649 | /* Return true if the given thread is still alive. */ |
1650 | ||
1651 | bool | |
1652 | linux_process_target::thread_alive (ptid_t ptid) | |
0d62e5e8 | 1653 | { |
95954743 PA |
1654 | struct lwp_info *lwp = find_lwp_pid (ptid); |
1655 | ||
1656 | /* We assume we always know if a thread exits. If a whole process | |
1657 | exited but we still haven't been able to report it to GDB, we'll | |
1658 | hold on to the last lwp of the dead process. */ | |
1659 | if (lwp != NULL) | |
00db26fa | 1660 | return !lwp_is_marked_dead (lwp); |
0d62e5e8 DJ |
1661 | else |
1662 | return 0; | |
1663 | } | |
1664 | ||
df95181f TBA |
1665 | bool |
1666 | linux_process_target::thread_still_has_status_pending (thread_info *thread) | |
582511be PA |
1667 | { |
1668 | struct lwp_info *lp = get_thread_lwp (thread); | |
1669 | ||
1670 | if (!lp->status_pending_p) | |
1671 | return 0; | |
1672 | ||
582511be | 1673 | if (thread->last_resume_kind != resume_stop |
15c66dd6 PA |
1674 | && (lp->stop_reason == TARGET_STOPPED_BY_SW_BREAKPOINT |
1675 | || lp->stop_reason == TARGET_STOPPED_BY_HW_BREAKPOINT)) | |
582511be PA |
1676 | { |
1677 | struct thread_info *saved_thread; | |
1678 | CORE_ADDR pc; | |
1679 | int discard = 0; | |
1680 | ||
1681 | gdb_assert (lp->last_status != 0); | |
1682 | ||
1683 | pc = get_pc (lp); | |
1684 | ||
1685 | saved_thread = current_thread; | |
1686 | current_thread = thread; | |
1687 | ||
1688 | if (pc != lp->stop_pc) | |
1689 | { | |
1690 | if (debug_threads) | |
1691 | debug_printf ("PC of %ld changed\n", | |
1692 | lwpid_of (thread)); | |
1693 | discard = 1; | |
1694 | } | |
3e572f71 PA |
1695 | |
1696 | #if !USE_SIGTRAP_SIGINFO | |
15c66dd6 | 1697 | else if (lp->stop_reason == TARGET_STOPPED_BY_SW_BREAKPOINT |
d7146cda | 1698 | && !low_breakpoint_at (pc)) |
582511be PA |
1699 | { |
1700 | if (debug_threads) | |
1701 | debug_printf ("previous SW breakpoint of %ld gone\n", | |
1702 | lwpid_of (thread)); | |
1703 | discard = 1; | |
1704 | } | |
15c66dd6 | 1705 | else if (lp->stop_reason == TARGET_STOPPED_BY_HW_BREAKPOINT |
582511be PA |
1706 | && !hardware_breakpoint_inserted_here (pc)) |
1707 | { | |
1708 | if (debug_threads) | |
1709 | debug_printf ("previous HW breakpoint of %ld gone\n", | |
1710 | lwpid_of (thread)); | |
1711 | discard = 1; | |
1712 | } | |
3e572f71 | 1713 | #endif |
582511be PA |
1714 | |
1715 | current_thread = saved_thread; | |
1716 | ||
1717 | if (discard) | |
1718 | { | |
1719 | if (debug_threads) | |
1720 | debug_printf ("discarding pending breakpoint status\n"); | |
1721 | lp->status_pending_p = 0; | |
1722 | return 0; | |
1723 | } | |
1724 | } | |
1725 | ||
1726 | return 1; | |
1727 | } | |
1728 | ||
a681f9c9 PA |
1729 | /* Returns true if LWP is resumed from the client's perspective. */ |
1730 | ||
1731 | static int | |
1732 | lwp_resumed (struct lwp_info *lwp) | |
1733 | { | |
1734 | struct thread_info *thread = get_lwp_thread (lwp); | |
1735 | ||
1736 | if (thread->last_resume_kind != resume_stop) | |
1737 | return 1; | |
1738 | ||
1739 | /* Did gdb send us a `vCont;t', but we haven't reported the | |
1740 | corresponding stop to gdb yet? If so, the thread is still | |
1741 | resumed/running from gdb's perspective. */ | |
1742 | if (thread->last_resume_kind == resume_stop | |
1743 | && thread->last_status.kind == TARGET_WAITKIND_IGNORE) | |
1744 | return 1; | |
1745 | ||
1746 | return 0; | |
1747 | } | |
1748 | ||
df95181f TBA |
1749 | bool |
1750 | linux_process_target::status_pending_p_callback (thread_info *thread, | |
1751 | ptid_t ptid) | |
0d62e5e8 | 1752 | { |
582511be | 1753 | struct lwp_info *lp = get_thread_lwp (thread); |
95954743 PA |
1754 | |
1755 | /* Check if we're only interested in events from a specific process | |
afa8d396 | 1756 | or a specific LWP. */ |
83e1b6c1 | 1757 | if (!thread->id.matches (ptid)) |
95954743 | 1758 | return 0; |
0d62e5e8 | 1759 | |
a681f9c9 PA |
1760 | if (!lwp_resumed (lp)) |
1761 | return 0; | |
1762 | ||
582511be | 1763 | if (lp->status_pending_p |
df95181f | 1764 | && !thread_still_has_status_pending (thread)) |
582511be | 1765 | { |
df95181f | 1766 | resume_one_lwp (lp, lp->stepping, GDB_SIGNAL_0, NULL); |
582511be PA |
1767 | return 0; |
1768 | } | |
0d62e5e8 | 1769 | |
582511be | 1770 | return lp->status_pending_p; |
0d62e5e8 DJ |
1771 | } |
1772 | ||
95954743 PA |
1773 | struct lwp_info * |
1774 | find_lwp_pid (ptid_t ptid) | |
1775 | { | |
da4ae14a | 1776 | thread_info *thread = find_thread ([&] (thread_info *thr_arg) |
454296a2 SM |
1777 | { |
1778 | int lwp = ptid.lwp () != 0 ? ptid.lwp () : ptid.pid (); | |
da4ae14a | 1779 | return thr_arg->id.lwp () == lwp; |
454296a2 | 1780 | }); |
d86d4aaf DE |
1781 | |
1782 | if (thread == NULL) | |
1783 | return NULL; | |
1784 | ||
9c80ecd6 | 1785 | return get_thread_lwp (thread); |
95954743 PA |
1786 | } |
1787 | ||
fa96cb38 | 1788 | /* Return the number of known LWPs in the tgid given by PID. */ |
0d62e5e8 | 1789 | |
fa96cb38 PA |
1790 | static int |
1791 | num_lwps (int pid) | |
1792 | { | |
fa96cb38 | 1793 | int count = 0; |
0d62e5e8 | 1794 | |
4d3bb80e SM |
1795 | for_each_thread (pid, [&] (thread_info *thread) |
1796 | { | |
9c80ecd6 | 1797 | count++; |
4d3bb80e | 1798 | }); |
3aee8918 | 1799 | |
fa96cb38 PA |
1800 | return count; |
1801 | } | |
d61ddec4 | 1802 | |
6d4ee8c6 GB |
1803 | /* See nat/linux-nat.h. */ |
1804 | ||
1805 | struct lwp_info * | |
1806 | iterate_over_lwps (ptid_t filter, | |
d3a70e03 | 1807 | gdb::function_view<iterate_over_lwps_ftype> callback) |
6d4ee8c6 | 1808 | { |
da4ae14a | 1809 | thread_info *thread = find_thread (filter, [&] (thread_info *thr_arg) |
6d1e5673 | 1810 | { |
da4ae14a | 1811 | lwp_info *lwp = get_thread_lwp (thr_arg); |
6d1e5673 | 1812 | |
d3a70e03 | 1813 | return callback (lwp); |
6d1e5673 | 1814 | }); |
6d4ee8c6 | 1815 | |
9c80ecd6 | 1816 | if (thread == NULL) |
6d4ee8c6 GB |
1817 | return NULL; |
1818 | ||
9c80ecd6 | 1819 | return get_thread_lwp (thread); |
6d4ee8c6 GB |
1820 | } |
1821 | ||
fd000fb3 TBA |
1822 | void |
1823 | linux_process_target::check_zombie_leaders () | |
fa96cb38 | 1824 | { |
fd000fb3 | 1825 | for_each_process ([this] (process_info *proc) { |
9179355e SM |
1826 | pid_t leader_pid = pid_of (proc); |
1827 | struct lwp_info *leader_lp; | |
1828 | ||
f2907e49 | 1829 | leader_lp = find_lwp_pid (ptid_t (leader_pid)); |
9179355e SM |
1830 | |
1831 | if (debug_threads) | |
1832 | debug_printf ("leader_pid=%d, leader_lp!=NULL=%d, " | |
1833 | "num_lwps=%d, zombie=%d\n", | |
1834 | leader_pid, leader_lp!= NULL, num_lwps (leader_pid), | |
1835 | linux_proc_pid_is_zombie (leader_pid)); | |
1836 | ||
1837 | if (leader_lp != NULL && !leader_lp->stopped | |
1838 | /* Check if there are other threads in the group, as we may | |
1839 | have raced with the inferior simply exiting. */ | |
1840 | && !last_thread_of_process_p (leader_pid) | |
1841 | && linux_proc_pid_is_zombie (leader_pid)) | |
1842 | { | |
1843 | /* A leader zombie can mean one of two things: | |
1844 | ||
1845 | - It exited, and there's an exit status pending | |
1846 | available, or only the leader exited (not the whole | |
1847 | program). In the latter case, we can't waitpid the | |
1848 | leader's exit status until all other threads are gone. | |
1849 | ||
1850 | - There are 3 or more threads in the group, and a thread | |
1851 | other than the leader exec'd. On an exec, the Linux | |
1852 | kernel destroys all other threads (except the execing | |
1853 | one) in the thread group, and resets the execing thread's | |
1854 | tid to the tgid. No exit notification is sent for the | |
1855 | execing thread -- from the ptracer's perspective, it | |
1856 | appears as though the execing thread just vanishes. | |
1857 | Until we reap all other threads except the leader and the | |
1858 | execing thread, the leader will be zombie, and the | |
1859 | execing thread will be in `D (disc sleep)'. As soon as | |
1860 | all other threads are reaped, the execing thread changes | |
1861 | it's tid to the tgid, and the previous (zombie) leader | |
1862 | vanishes, giving place to the "new" leader. We could try | |
1863 | distinguishing the exit and exec cases, by waiting once | |
1864 | more, and seeing if something comes out, but it doesn't | |
1865 | sound useful. The previous leader _does_ go away, and | |
1866 | we'll re-add the new one once we see the exec event | |
1867 | (which is just the same as what would happen if the | |
1868 | previous leader did exit voluntarily before some other | |
1869 | thread execs). */ | |
1870 | ||
1871 | if (debug_threads) | |
1872 | debug_printf ("CZL: Thread group leader %d zombie " | |
1873 | "(it exited, or another thread execd).\n", | |
1874 | leader_pid); | |
1875 | ||
1876 | delete_lwp (leader_lp); | |
1877 | } | |
1878 | }); | |
fa96cb38 | 1879 | } |
c3adc08c | 1880 | |
a1385b7b SM |
1881 | /* Callback for `find_thread'. Returns the first LWP that is not |
1882 | stopped. */ | |
d50171e4 | 1883 | |
a1385b7b SM |
1884 | static bool |
1885 | not_stopped_callback (thread_info *thread, ptid_t filter) | |
fa96cb38 | 1886 | { |
a1385b7b SM |
1887 | if (!thread->id.matches (filter)) |
1888 | return false; | |
47c0c975 | 1889 | |
a1385b7b | 1890 | lwp_info *lwp = get_thread_lwp (thread); |
fa96cb38 | 1891 | |
a1385b7b | 1892 | return !lwp->stopped; |
0d62e5e8 | 1893 | } |
611cb4a5 | 1894 | |
863d01bd PA |
1895 | /* Increment LWP's suspend count. */ |
1896 | ||
1897 | static void | |
1898 | lwp_suspended_inc (struct lwp_info *lwp) | |
1899 | { | |
1900 | lwp->suspended++; | |
1901 | ||
1902 | if (debug_threads && lwp->suspended > 4) | |
1903 | { | |
1904 | struct thread_info *thread = get_lwp_thread (lwp); | |
1905 | ||
1906 | debug_printf ("LWP %ld has a suspiciously high suspend count," | |
1907 | " suspended=%d\n", lwpid_of (thread), lwp->suspended); | |
1908 | } | |
1909 | } | |
1910 | ||
1911 | /* Decrement LWP's suspend count. */ | |
1912 | ||
1913 | static void | |
1914 | lwp_suspended_decr (struct lwp_info *lwp) | |
1915 | { | |
1916 | lwp->suspended--; | |
1917 | ||
1918 | if (lwp->suspended < 0) | |
1919 | { | |
1920 | struct thread_info *thread = get_lwp_thread (lwp); | |
1921 | ||
1922 | internal_error (__FILE__, __LINE__, | |
1923 | "unsuspend LWP %ld, suspended=%d\n", lwpid_of (thread), | |
1924 | lwp->suspended); | |
1925 | } | |
1926 | } | |
1927 | ||
219f2f23 PA |
1928 | /* This function should only be called if the LWP got a SIGTRAP. |
1929 | ||
1930 | Handle any tracepoint steps or hits. Return true if a tracepoint | |
1931 | event was handled, 0 otherwise. */ | |
1932 | ||
1933 | static int | |
1934 | handle_tracepoints (struct lwp_info *lwp) | |
1935 | { | |
1936 | struct thread_info *tinfo = get_lwp_thread (lwp); | |
1937 | int tpoint_related_event = 0; | |
1938 | ||
582511be PA |
1939 | gdb_assert (lwp->suspended == 0); |
1940 | ||
7984d532 PA |
1941 | /* If this tracepoint hit causes a tracing stop, we'll immediately |
1942 | uninsert tracepoints. To do this, we temporarily pause all | |
1943 | threads, unpatch away, and then unpause threads. We need to make | |
1944 | sure the unpausing doesn't resume LWP too. */ | |
863d01bd | 1945 | lwp_suspended_inc (lwp); |
7984d532 | 1946 | |
219f2f23 PA |
1947 | /* And we need to be sure that any all-threads-stopping doesn't try |
1948 | to move threads out of the jump pads, as it could deadlock the | |
1949 | inferior (LWP could be in the jump pad, maybe even holding the | |
1950 | lock.) */ | |
1951 | ||
1952 | /* Do any necessary step collect actions. */ | |
1953 | tpoint_related_event |= tracepoint_finished_step (tinfo, lwp->stop_pc); | |
1954 | ||
fa593d66 PA |
1955 | tpoint_related_event |= handle_tracepoint_bkpts (tinfo, lwp->stop_pc); |
1956 | ||
219f2f23 PA |
1957 | /* See if we just hit a tracepoint and do its main collect |
1958 | actions. */ | |
1959 | tpoint_related_event |= tracepoint_was_hit (tinfo, lwp->stop_pc); | |
1960 | ||
863d01bd | 1961 | lwp_suspended_decr (lwp); |
7984d532 PA |
1962 | |
1963 | gdb_assert (lwp->suspended == 0); | |
229d26fc SM |
1964 | gdb_assert (!stabilizing_threads |
1965 | || (lwp->collecting_fast_tracepoint | |
1966 | != fast_tpoint_collect_result::not_collecting)); | |
7984d532 | 1967 | |
219f2f23 PA |
1968 | if (tpoint_related_event) |
1969 | { | |
1970 | if (debug_threads) | |
87ce2a04 | 1971 | debug_printf ("got a tracepoint event\n"); |
219f2f23 PA |
1972 | return 1; |
1973 | } | |
1974 | ||
1975 | return 0; | |
1976 | } | |
1977 | ||
13e567af TBA |
1978 | fast_tpoint_collect_result |
1979 | linux_process_target::linux_fast_tracepoint_collecting | |
1980 | (lwp_info *lwp, fast_tpoint_collect_status *status) | |
fa593d66 PA |
1981 | { |
1982 | CORE_ADDR thread_area; | |
d86d4aaf | 1983 | struct thread_info *thread = get_lwp_thread (lwp); |
fa593d66 | 1984 | |
fa593d66 PA |
1985 | /* Get the thread area address. This is used to recognize which |
1986 | thread is which when tracing with the in-process agent library. | |
1987 | We don't read anything from the address, and treat it as opaque; | |
1988 | it's the address itself that we assume is unique per-thread. */ | |
13e567af | 1989 | if (low_get_thread_area (lwpid_of (thread), &thread_area) == -1) |
229d26fc | 1990 | return fast_tpoint_collect_result::not_collecting; |
fa593d66 PA |
1991 | |
1992 | return fast_tracepoint_collecting (thread_area, lwp->stop_pc, status); | |
1993 | } | |
1994 | ||
13e567af TBA |
1995 | int |
1996 | linux_process_target::low_get_thread_area (int lwpid, CORE_ADDR *addrp) | |
1997 | { | |
1998 | return -1; | |
1999 | } | |
2000 | ||
d16f3f6c TBA |
2001 | bool |
2002 | linux_process_target::maybe_move_out_of_jump_pad (lwp_info *lwp, int *wstat) | |
fa593d66 | 2003 | { |
0bfdf32f | 2004 | struct thread_info *saved_thread; |
fa593d66 | 2005 | |
0bfdf32f GB |
2006 | saved_thread = current_thread; |
2007 | current_thread = get_lwp_thread (lwp); | |
fa593d66 PA |
2008 | |
2009 | if ((wstat == NULL | |
2010 | || (WIFSTOPPED (*wstat) && WSTOPSIG (*wstat) != SIGTRAP)) | |
2011 | && supports_fast_tracepoints () | |
58b4daa5 | 2012 | && agent_loaded_p ()) |
fa593d66 PA |
2013 | { |
2014 | struct fast_tpoint_collect_status status; | |
fa593d66 PA |
2015 | |
2016 | if (debug_threads) | |
87ce2a04 DE |
2017 | debug_printf ("Checking whether LWP %ld needs to move out of the " |
2018 | "jump pad.\n", | |
0bfdf32f | 2019 | lwpid_of (current_thread)); |
fa593d66 | 2020 | |
229d26fc SM |
2021 | fast_tpoint_collect_result r |
2022 | = linux_fast_tracepoint_collecting (lwp, &status); | |
fa593d66 PA |
2023 | |
2024 | if (wstat == NULL | |
2025 | || (WSTOPSIG (*wstat) != SIGILL | |
2026 | && WSTOPSIG (*wstat) != SIGFPE | |
2027 | && WSTOPSIG (*wstat) != SIGSEGV | |
2028 | && WSTOPSIG (*wstat) != SIGBUS)) | |
2029 | { | |
2030 | lwp->collecting_fast_tracepoint = r; | |
2031 | ||
229d26fc | 2032 | if (r != fast_tpoint_collect_result::not_collecting) |
fa593d66 | 2033 | { |
229d26fc SM |
2034 | if (r == fast_tpoint_collect_result::before_insn |
2035 | && lwp->exit_jump_pad_bkpt == NULL) | |
fa593d66 PA |
2036 | { |
2037 | /* Haven't executed the original instruction yet. | |
2038 | Set breakpoint there, and wait till it's hit, | |
2039 | then single-step until exiting the jump pad. */ | |
2040 | lwp->exit_jump_pad_bkpt | |
2041 | = set_breakpoint_at (status.adjusted_insn_addr, NULL); | |
2042 | } | |
2043 | ||
2044 | if (debug_threads) | |
87ce2a04 DE |
2045 | debug_printf ("Checking whether LWP %ld needs to move out of " |
2046 | "the jump pad...it does\n", | |
0bfdf32f GB |
2047 | lwpid_of (current_thread)); |
2048 | current_thread = saved_thread; | |
fa593d66 | 2049 | |
d16f3f6c | 2050 | return true; |
fa593d66 PA |
2051 | } |
2052 | } | |
2053 | else | |
2054 | { | |
2055 | /* If we get a synchronous signal while collecting, *and* | |
2056 | while executing the (relocated) original instruction, | |
2057 | reset the PC to point at the tpoint address, before | |
2058 | reporting to GDB. Otherwise, it's an IPA lib bug: just | |
2059 | report the signal to GDB, and pray for the best. */ | |
2060 | ||
229d26fc SM |
2061 | lwp->collecting_fast_tracepoint |
2062 | = fast_tpoint_collect_result::not_collecting; | |
fa593d66 | 2063 | |
229d26fc | 2064 | if (r != fast_tpoint_collect_result::not_collecting |
fa593d66 PA |
2065 | && (status.adjusted_insn_addr <= lwp->stop_pc |
2066 | && lwp->stop_pc < status.adjusted_insn_addr_end)) | |
2067 | { | |
2068 | siginfo_t info; | |
2069 | struct regcache *regcache; | |
2070 | ||
2071 | /* The si_addr on a few signals references the address | |
2072 | of the faulting instruction. Adjust that as | |
2073 | well. */ | |
2074 | if ((WSTOPSIG (*wstat) == SIGILL | |
2075 | || WSTOPSIG (*wstat) == SIGFPE | |
2076 | || WSTOPSIG (*wstat) == SIGBUS | |
2077 | || WSTOPSIG (*wstat) == SIGSEGV) | |
0bfdf32f | 2078 | && ptrace (PTRACE_GETSIGINFO, lwpid_of (current_thread), |
b8e1b30e | 2079 | (PTRACE_TYPE_ARG3) 0, &info) == 0 |
fa593d66 PA |
2080 | /* Final check just to make sure we don't clobber |
2081 | the siginfo of non-kernel-sent signals. */ | |
2082 | && (uintptr_t) info.si_addr == lwp->stop_pc) | |
2083 | { | |
2084 | info.si_addr = (void *) (uintptr_t) status.tpoint_addr; | |
0bfdf32f | 2085 | ptrace (PTRACE_SETSIGINFO, lwpid_of (current_thread), |
b8e1b30e | 2086 | (PTRACE_TYPE_ARG3) 0, &info); |
fa593d66 PA |
2087 | } |
2088 | ||
0bfdf32f | 2089 | regcache = get_thread_regcache (current_thread, 1); |
bf9ae9d8 | 2090 | low_set_pc (regcache, status.tpoint_addr); |
fa593d66 PA |
2091 | lwp->stop_pc = status.tpoint_addr; |
2092 | ||
2093 | /* Cancel any fast tracepoint lock this thread was | |
2094 | holding. */ | |
2095 | force_unlock_trace_buffer (); | |
2096 | } | |
2097 | ||
2098 | if (lwp->exit_jump_pad_bkpt != NULL) | |
2099 | { | |
2100 | if (debug_threads) | |
87ce2a04 DE |
2101 | debug_printf ("Cancelling fast exit-jump-pad: removing bkpt. " |
2102 | "stopping all threads momentarily.\n"); | |
fa593d66 PA |
2103 | |
2104 | stop_all_lwps (1, lwp); | |
fa593d66 PA |
2105 | |
2106 | delete_breakpoint (lwp->exit_jump_pad_bkpt); | |
2107 | lwp->exit_jump_pad_bkpt = NULL; | |
2108 | ||
2109 | unstop_all_lwps (1, lwp); | |
2110 | ||
2111 | gdb_assert (lwp->suspended >= 0); | |
2112 | } | |
2113 | } | |
2114 | } | |
2115 | ||
2116 | if (debug_threads) | |
87ce2a04 DE |
2117 | debug_printf ("Checking whether LWP %ld needs to move out of the " |
2118 | "jump pad...no\n", | |
0bfdf32f | 2119 | lwpid_of (current_thread)); |
0cccb683 | 2120 | |
0bfdf32f | 2121 | current_thread = saved_thread; |
d16f3f6c | 2122 | return false; |
fa593d66 PA |
2123 | } |
2124 | ||
2125 | /* Enqueue one signal in the "signals to report later when out of the | |
2126 | jump pad" list. */ | |
2127 | ||
2128 | static void | |
2129 | enqueue_one_deferred_signal (struct lwp_info *lwp, int *wstat) | |
2130 | { | |
2131 | struct pending_signals *p_sig; | |
d86d4aaf | 2132 | struct thread_info *thread = get_lwp_thread (lwp); |
fa593d66 PA |
2133 | |
2134 | if (debug_threads) | |
87ce2a04 | 2135 | debug_printf ("Deferring signal %d for LWP %ld.\n", |
d86d4aaf | 2136 | WSTOPSIG (*wstat), lwpid_of (thread)); |
fa593d66 PA |
2137 | |
2138 | if (debug_threads) | |
2139 | { | |
2140 | struct pending_signals *sig; | |
2141 | ||
2142 | for (sig = lwp->pending_signals_to_report; | |
2143 | sig != NULL; | |
2144 | sig = sig->prev) | |
87ce2a04 DE |
2145 | debug_printf (" Already queued %d\n", |
2146 | sig->signal); | |
fa593d66 | 2147 | |
87ce2a04 | 2148 | debug_printf (" (no more currently queued signals)\n"); |
fa593d66 PA |
2149 | } |
2150 | ||
1a981360 PA |
2151 | /* Don't enqueue non-RT signals if they are already in the deferred |
2152 | queue. (SIGSTOP being the easiest signal to see ending up here | |
2153 | twice) */ | |
2154 | if (WSTOPSIG (*wstat) < __SIGRTMIN) | |
2155 | { | |
2156 | struct pending_signals *sig; | |
2157 | ||
2158 | for (sig = lwp->pending_signals_to_report; | |
2159 | sig != NULL; | |
2160 | sig = sig->prev) | |
2161 | { | |
2162 | if (sig->signal == WSTOPSIG (*wstat)) | |
2163 | { | |
2164 | if (debug_threads) | |
87ce2a04 DE |
2165 | debug_printf ("Not requeuing already queued non-RT signal %d" |
2166 | " for LWP %ld\n", | |
2167 | sig->signal, | |
d86d4aaf | 2168 | lwpid_of (thread)); |
1a981360 PA |
2169 | return; |
2170 | } | |
2171 | } | |
2172 | } | |
2173 | ||
8d749320 | 2174 | p_sig = XCNEW (struct pending_signals); |
fa593d66 PA |
2175 | p_sig->prev = lwp->pending_signals_to_report; |
2176 | p_sig->signal = WSTOPSIG (*wstat); | |
8d749320 | 2177 | |
d86d4aaf | 2178 | ptrace (PTRACE_GETSIGINFO, lwpid_of (thread), (PTRACE_TYPE_ARG3) 0, |
56f7af9c | 2179 | &p_sig->info); |
fa593d66 PA |
2180 | |
2181 | lwp->pending_signals_to_report = p_sig; | |
2182 | } | |
2183 | ||
2184 | /* Dequeue one signal from the "signals to report later when out of | |
2185 | the jump pad" list. */ | |
2186 | ||
2187 | static int | |
2188 | dequeue_one_deferred_signal (struct lwp_info *lwp, int *wstat) | |
2189 | { | |
d86d4aaf DE |
2190 | struct thread_info *thread = get_lwp_thread (lwp); |
2191 | ||
fa593d66 PA |
2192 | if (lwp->pending_signals_to_report != NULL) |
2193 | { | |
2194 | struct pending_signals **p_sig; | |
2195 | ||
2196 | p_sig = &lwp->pending_signals_to_report; | |
2197 | while ((*p_sig)->prev != NULL) | |
2198 | p_sig = &(*p_sig)->prev; | |
2199 | ||
2200 | *wstat = W_STOPCODE ((*p_sig)->signal); | |
2201 | if ((*p_sig)->info.si_signo != 0) | |
d86d4aaf | 2202 | ptrace (PTRACE_SETSIGINFO, lwpid_of (thread), (PTRACE_TYPE_ARG3) 0, |
56f7af9c | 2203 | &(*p_sig)->info); |
fa593d66 PA |
2204 | free (*p_sig); |
2205 | *p_sig = NULL; | |
2206 | ||
2207 | if (debug_threads) | |
87ce2a04 | 2208 | debug_printf ("Reporting deferred signal %d for LWP %ld.\n", |
d86d4aaf | 2209 | WSTOPSIG (*wstat), lwpid_of (thread)); |
fa593d66 PA |
2210 | |
2211 | if (debug_threads) | |
2212 | { | |
2213 | struct pending_signals *sig; | |
2214 | ||
2215 | for (sig = lwp->pending_signals_to_report; | |
2216 | sig != NULL; | |
2217 | sig = sig->prev) | |
87ce2a04 DE |
2218 | debug_printf (" Still queued %d\n", |
2219 | sig->signal); | |
fa593d66 | 2220 | |
87ce2a04 | 2221 | debug_printf (" (no more queued signals)\n"); |
fa593d66 PA |
2222 | } |
2223 | ||
2224 | return 1; | |
2225 | } | |
2226 | ||
2227 | return 0; | |
2228 | } | |
2229 | ||
ac1bbaca TBA |
2230 | bool |
2231 | linux_process_target::check_stopped_by_watchpoint (lwp_info *child) | |
582511be | 2232 | { |
ac1bbaca TBA |
2233 | struct thread_info *saved_thread = current_thread; |
2234 | current_thread = get_lwp_thread (child); | |
d50171e4 | 2235 | |
ac1bbaca TBA |
2236 | if (low_stopped_by_watchpoint ()) |
2237 | { | |
2238 | child->stop_reason = TARGET_STOPPED_BY_WATCHPOINT; | |
2239 | child->stopped_data_address = low_stopped_data_address (); | |
2240 | } | |
582511be | 2241 | |
ac1bbaca | 2242 | current_thread = saved_thread; |
582511be | 2243 | |
ac1bbaca TBA |
2244 | return child->stop_reason == TARGET_STOPPED_BY_WATCHPOINT; |
2245 | } | |
d50171e4 | 2246 | |
ac1bbaca TBA |
2247 | bool |
2248 | linux_process_target::low_stopped_by_watchpoint () | |
2249 | { | |
2250 | return false; | |
2251 | } | |
d50171e4 | 2252 | |
ac1bbaca TBA |
2253 | CORE_ADDR |
2254 | linux_process_target::low_stopped_data_address () | |
2255 | { | |
2256 | return 0; | |
c4d9ceb6 YQ |
2257 | } |
2258 | ||
de0d863e DB |
2259 | /* Return the ptrace options that we want to try to enable. */ |
2260 | ||
2261 | static int | |
2262 | linux_low_ptrace_options (int attached) | |
2263 | { | |
c12a5089 | 2264 | client_state &cs = get_client_state (); |
de0d863e DB |
2265 | int options = 0; |
2266 | ||
2267 | if (!attached) | |
2268 | options |= PTRACE_O_EXITKILL; | |
2269 | ||
c12a5089 | 2270 | if (cs.report_fork_events) |
de0d863e DB |
2271 | options |= PTRACE_O_TRACEFORK; |
2272 | ||
c12a5089 | 2273 | if (cs.report_vfork_events) |
c269dbdb DB |
2274 | options |= (PTRACE_O_TRACEVFORK | PTRACE_O_TRACEVFORKDONE); |
2275 | ||
c12a5089 | 2276 | if (cs.report_exec_events) |
94585166 DB |
2277 | options |= PTRACE_O_TRACEEXEC; |
2278 | ||
82075af2 JS |
2279 | options |= PTRACE_O_TRACESYSGOOD; |
2280 | ||
de0d863e DB |
2281 | return options; |
2282 | } | |
2283 | ||
d16f3f6c TBA |
2284 | lwp_info * |
2285 | linux_process_target::filter_event (int lwpid, int wstat) | |
fa96cb38 | 2286 | { |
c12a5089 | 2287 | client_state &cs = get_client_state (); |
fa96cb38 PA |
2288 | struct lwp_info *child; |
2289 | struct thread_info *thread; | |
582511be | 2290 | int have_stop_pc = 0; |
fa96cb38 | 2291 | |
f2907e49 | 2292 | child = find_lwp_pid (ptid_t (lwpid)); |
fa96cb38 | 2293 | |
94585166 DB |
2294 | /* Check for stop events reported by a process we didn't already |
2295 | know about - anything not already in our LWP list. | |
2296 | ||
2297 | If we're expecting to receive stopped processes after | |
2298 | fork, vfork, and clone events, then we'll just add the | |
2299 | new one to our list and go back to waiting for the event | |
2300 | to be reported - the stopped process might be returned | |
2301 | from waitpid before or after the event is. | |
2302 | ||
2303 | But note the case of a non-leader thread exec'ing after the | |
2304 | leader having exited, and gone from our lists (because | |
2305 | check_zombie_leaders deleted it). The non-leader thread | |
2306 | changes its tid to the tgid. */ | |
2307 | ||
2308 | if (WIFSTOPPED (wstat) && child == NULL && WSTOPSIG (wstat) == SIGTRAP | |
2309 | && linux_ptrace_get_extended_event (wstat) == PTRACE_EVENT_EXEC) | |
2310 | { | |
2311 | ptid_t child_ptid; | |
2312 | ||
2313 | /* A multi-thread exec after we had seen the leader exiting. */ | |
2314 | if (debug_threads) | |
2315 | { | |
2316 | debug_printf ("LLW: Re-adding thread group leader LWP %d" | |
2317 | "after exec.\n", lwpid); | |
2318 | } | |
2319 | ||
fd79271b | 2320 | child_ptid = ptid_t (lwpid, lwpid, 0); |
94585166 DB |
2321 | child = add_lwp (child_ptid); |
2322 | child->stopped = 1; | |
2323 | current_thread = child->thread; | |
2324 | } | |
2325 | ||
fa96cb38 PA |
2326 | /* If we didn't find a process, one of two things presumably happened: |
2327 | - A process we started and then detached from has exited. Ignore it. | |
2328 | - A process we are controlling has forked and the new child's stop | |
2329 | was reported to us by the kernel. Save its PID. */ | |
2330 | if (child == NULL && WIFSTOPPED (wstat)) | |
2331 | { | |
2332 | add_to_pid_list (&stopped_pids, lwpid, wstat); | |
2333 | return NULL; | |
2334 | } | |
2335 | else if (child == NULL) | |
2336 | return NULL; | |
2337 | ||
2338 | thread = get_lwp_thread (child); | |
2339 | ||
2340 | child->stopped = 1; | |
2341 | ||
2342 | child->last_status = wstat; | |
2343 | ||
582511be PA |
2344 | /* Check if the thread has exited. */ |
2345 | if ((WIFEXITED (wstat) || WIFSIGNALED (wstat))) | |
2346 | { | |
2347 | if (debug_threads) | |
2348 | debug_printf ("LLFE: %d exited.\n", lwpid); | |
f50bf8e5 YQ |
2349 | |
2350 | if (finish_step_over (child)) | |
2351 | { | |
2352 | /* Unsuspend all other LWPs, and set them back running again. */ | |
2353 | unsuspend_all_lwps (child); | |
2354 | } | |
2355 | ||
65706a29 PA |
2356 | /* If there is at least one more LWP, then the exit signal was |
2357 | not the end of the debugged application and should be | |
2358 | ignored, unless GDB wants to hear about thread exits. */ | |
c12a5089 | 2359 | if (cs.report_thread_events |
65706a29 | 2360 | || last_thread_of_process_p (pid_of (thread))) |
582511be | 2361 | { |
65706a29 PA |
2362 | /* Since events are serialized to GDB core, and we can't |
2363 | report this one right now. Leave the status pending for | |
2364 | the next time we're able to report it. */ | |
2365 | mark_lwp_dead (child, wstat); | |
2366 | return child; | |
582511be PA |
2367 | } |
2368 | else | |
2369 | { | |
65706a29 PA |
2370 | delete_lwp (child); |
2371 | return NULL; | |
582511be PA |
2372 | } |
2373 | } | |
2374 | ||
2375 | gdb_assert (WIFSTOPPED (wstat)); | |
2376 | ||
fa96cb38 PA |
2377 | if (WIFSTOPPED (wstat)) |
2378 | { | |
2379 | struct process_info *proc; | |
2380 | ||
c06cbd92 | 2381 | /* Architecture-specific setup after inferior is running. */ |
fa96cb38 | 2382 | proc = find_process_pid (pid_of (thread)); |
c06cbd92 | 2383 | if (proc->tdesc == NULL) |
fa96cb38 | 2384 | { |
c06cbd92 YQ |
2385 | if (proc->attached) |
2386 | { | |
c06cbd92 YQ |
2387 | /* This needs to happen after we have attached to the |
2388 | inferior and it is stopped for the first time, but | |
2389 | before we access any inferior registers. */ | |
797bcff5 | 2390 | arch_setup_thread (thread); |
c06cbd92 YQ |
2391 | } |
2392 | else | |
2393 | { | |
2394 | /* The process is started, but GDBserver will do | |
2395 | architecture-specific setup after the program stops at | |
2396 | the first instruction. */ | |
2397 | child->status_pending_p = 1; | |
2398 | child->status_pending = wstat; | |
2399 | return child; | |
2400 | } | |
fa96cb38 PA |
2401 | } |
2402 | } | |
2403 | ||
fa96cb38 PA |
2404 | if (WIFSTOPPED (wstat) && child->must_set_ptrace_flags) |
2405 | { | |
beed38b8 | 2406 | struct process_info *proc = find_process_pid (pid_of (thread)); |
de0d863e | 2407 | int options = linux_low_ptrace_options (proc->attached); |
beed38b8 | 2408 | |
de0d863e | 2409 | linux_enable_event_reporting (lwpid, options); |
fa96cb38 PA |
2410 | child->must_set_ptrace_flags = 0; |
2411 | } | |
2412 | ||
82075af2 JS |
2413 | /* Always update syscall_state, even if it will be filtered later. */ |
2414 | if (WIFSTOPPED (wstat) && WSTOPSIG (wstat) == SYSCALL_SIGTRAP) | |
2415 | { | |
2416 | child->syscall_state | |
2417 | = (child->syscall_state == TARGET_WAITKIND_SYSCALL_ENTRY | |
2418 | ? TARGET_WAITKIND_SYSCALL_RETURN | |
2419 | : TARGET_WAITKIND_SYSCALL_ENTRY); | |
2420 | } | |
2421 | else | |
2422 | { | |
2423 | /* Almost all other ptrace-stops are known to be outside of system | |
2424 | calls, with further exceptions in handle_extended_wait. */ | |
2425 | child->syscall_state = TARGET_WAITKIND_IGNORE; | |
2426 | } | |
2427 | ||
e7ad2f14 PA |
2428 | /* Be careful to not overwrite stop_pc until save_stop_reason is |
2429 | called. */ | |
fa96cb38 | 2430 | if (WIFSTOPPED (wstat) && WSTOPSIG (wstat) == SIGTRAP |
89a5711c | 2431 | && linux_is_extended_waitstatus (wstat)) |
fa96cb38 | 2432 | { |
582511be | 2433 | child->stop_pc = get_pc (child); |
94585166 | 2434 | if (handle_extended_wait (&child, wstat)) |
de0d863e DB |
2435 | { |
2436 | /* The event has been handled, so just return without | |
2437 | reporting it. */ | |
2438 | return NULL; | |
2439 | } | |
fa96cb38 PA |
2440 | } |
2441 | ||
80aea927 | 2442 | if (linux_wstatus_maybe_breakpoint (wstat)) |
582511be | 2443 | { |
e7ad2f14 | 2444 | if (save_stop_reason (child)) |
582511be PA |
2445 | have_stop_pc = 1; |
2446 | } | |
2447 | ||
2448 | if (!have_stop_pc) | |
2449 | child->stop_pc = get_pc (child); | |
2450 | ||
fa96cb38 PA |
2451 | if (WIFSTOPPED (wstat) && WSTOPSIG (wstat) == SIGSTOP |
2452 | && child->stop_expected) | |
2453 | { | |
2454 | if (debug_threads) | |
2455 | debug_printf ("Expected stop.\n"); | |
2456 | child->stop_expected = 0; | |
2457 | ||
2458 | if (thread->last_resume_kind == resume_stop) | |
2459 | { | |
2460 | /* We want to report the stop to the core. Treat the | |
2461 | SIGSTOP as a normal event. */ | |
2bf6fb9d PA |
2462 | if (debug_threads) |
2463 | debug_printf ("LLW: resume_stop SIGSTOP caught for %s.\n", | |
2464 | target_pid_to_str (ptid_of (thread))); | |
fa96cb38 PA |
2465 | } |
2466 | else if (stopping_threads != NOT_STOPPING_THREADS) | |
2467 | { | |
2468 | /* Stopping threads. We don't want this SIGSTOP to end up | |
582511be | 2469 | pending. */ |
2bf6fb9d PA |
2470 | if (debug_threads) |
2471 | debug_printf ("LLW: SIGSTOP caught for %s " | |
2472 | "while stopping threads.\n", | |
2473 | target_pid_to_str (ptid_of (thread))); | |
fa96cb38 PA |
2474 | return NULL; |
2475 | } | |
2476 | else | |
2477 | { | |
2bf6fb9d PA |
2478 | /* This is a delayed SIGSTOP. Filter out the event. */ |
2479 | if (debug_threads) | |
2480 | debug_printf ("LLW: %s %s, 0, 0 (discard delayed SIGSTOP)\n", | |
2481 | child->stepping ? "step" : "continue", | |
2482 | target_pid_to_str (ptid_of (thread))); | |
2483 | ||
df95181f | 2484 | resume_one_lwp (child, child->stepping, 0, NULL); |
fa96cb38 PA |
2485 | return NULL; |
2486 | } | |
2487 | } | |
2488 | ||
582511be PA |
2489 | child->status_pending_p = 1; |
2490 | child->status_pending = wstat; | |
fa96cb38 PA |
2491 | return child; |
2492 | } | |
2493 | ||
b31cdfa6 TBA |
2494 | bool |
2495 | linux_process_target::maybe_hw_step (thread_info *thread) | |
f79b145d | 2496 | { |
b31cdfa6 TBA |
2497 | if (supports_hardware_single_step ()) |
2498 | return true; | |
f79b145d YQ |
2499 | else |
2500 | { | |
3b9a79ef | 2501 | /* GDBserver must insert single-step breakpoint for software |
f79b145d | 2502 | single step. */ |
3b9a79ef | 2503 | gdb_assert (has_single_step_breakpoints (thread)); |
b31cdfa6 | 2504 | return false; |
f79b145d YQ |
2505 | } |
2506 | } | |
2507 | ||
df95181f TBA |
2508 | void |
2509 | linux_process_target::resume_stopped_resumed_lwps (thread_info *thread) | |
20ba1ce6 | 2510 | { |
20ba1ce6 PA |
2511 | struct lwp_info *lp = get_thread_lwp (thread); |
2512 | ||
2513 | if (lp->stopped | |
863d01bd | 2514 | && !lp->suspended |
20ba1ce6 | 2515 | && !lp->status_pending_p |
20ba1ce6 PA |
2516 | && thread->last_status.kind == TARGET_WAITKIND_IGNORE) |
2517 | { | |
8901d193 YQ |
2518 | int step = 0; |
2519 | ||
2520 | if (thread->last_resume_kind == resume_step) | |
2521 | step = maybe_hw_step (thread); | |
20ba1ce6 PA |
2522 | |
2523 | if (debug_threads) | |
2524 | debug_printf ("RSRL: resuming stopped-resumed LWP %s at %s: step=%d\n", | |
2525 | target_pid_to_str (ptid_of (thread)), | |
2526 | paddress (lp->stop_pc), | |
2527 | step); | |
2528 | ||
df95181f | 2529 | resume_one_lwp (lp, step, GDB_SIGNAL_0, NULL); |
20ba1ce6 PA |
2530 | } |
2531 | } | |
2532 | ||
d16f3f6c TBA |
2533 | int |
2534 | linux_process_target::wait_for_event_filtered (ptid_t wait_ptid, | |
2535 | ptid_t filter_ptid, | |
2536 | int *wstatp, int options) | |
0d62e5e8 | 2537 | { |
d86d4aaf | 2538 | struct thread_info *event_thread; |
d50171e4 | 2539 | struct lwp_info *event_child, *requested_child; |
fa96cb38 | 2540 | sigset_t block_mask, prev_mask; |
d50171e4 | 2541 | |
fa96cb38 | 2542 | retry: |
d86d4aaf DE |
2543 | /* N.B. event_thread points to the thread_info struct that contains |
2544 | event_child. Keep them in sync. */ | |
2545 | event_thread = NULL; | |
d50171e4 PA |
2546 | event_child = NULL; |
2547 | requested_child = NULL; | |
0d62e5e8 | 2548 | |
95954743 | 2549 | /* Check for a lwp with a pending status. */ |
bd99dc85 | 2550 | |
d7e15655 | 2551 | if (filter_ptid == minus_one_ptid || filter_ptid.is_pid ()) |
0d62e5e8 | 2552 | { |
83e1b6c1 SM |
2553 | event_thread = find_thread_in_random ([&] (thread_info *thread) |
2554 | { | |
2555 | return status_pending_p_callback (thread, filter_ptid); | |
2556 | }); | |
2557 | ||
d86d4aaf DE |
2558 | if (event_thread != NULL) |
2559 | event_child = get_thread_lwp (event_thread); | |
2560 | if (debug_threads && event_thread) | |
2561 | debug_printf ("Got a pending child %ld\n", lwpid_of (event_thread)); | |
0d62e5e8 | 2562 | } |
d7e15655 | 2563 | else if (filter_ptid != null_ptid) |
0d62e5e8 | 2564 | { |
fa96cb38 | 2565 | requested_child = find_lwp_pid (filter_ptid); |
d50171e4 | 2566 | |
bde24c0a | 2567 | if (stopping_threads == NOT_STOPPING_THREADS |
fa593d66 | 2568 | && requested_child->status_pending_p |
229d26fc SM |
2569 | && (requested_child->collecting_fast_tracepoint |
2570 | != fast_tpoint_collect_result::not_collecting)) | |
fa593d66 PA |
2571 | { |
2572 | enqueue_one_deferred_signal (requested_child, | |
2573 | &requested_child->status_pending); | |
2574 | requested_child->status_pending_p = 0; | |
2575 | requested_child->status_pending = 0; | |
df95181f | 2576 | resume_one_lwp (requested_child, 0, 0, NULL); |
fa593d66 PA |
2577 | } |
2578 | ||
2579 | if (requested_child->suspended | |
2580 | && requested_child->status_pending_p) | |
38e08fca GB |
2581 | { |
2582 | internal_error (__FILE__, __LINE__, | |
2583 | "requesting an event out of a" | |
2584 | " suspended child?"); | |
2585 | } | |
fa593d66 | 2586 | |
d50171e4 | 2587 | if (requested_child->status_pending_p) |
d86d4aaf DE |
2588 | { |
2589 | event_child = requested_child; | |
2590 | event_thread = get_lwp_thread (event_child); | |
2591 | } | |
0d62e5e8 | 2592 | } |
611cb4a5 | 2593 | |
0d62e5e8 DJ |
2594 | if (event_child != NULL) |
2595 | { | |
bd99dc85 | 2596 | if (debug_threads) |
87ce2a04 | 2597 | debug_printf ("Got an event from pending child %ld (%04x)\n", |
d86d4aaf | 2598 | lwpid_of (event_thread), event_child->status_pending); |
fa96cb38 | 2599 | *wstatp = event_child->status_pending; |
bd99dc85 PA |
2600 | event_child->status_pending_p = 0; |
2601 | event_child->status_pending = 0; | |
0bfdf32f | 2602 | current_thread = event_thread; |
d86d4aaf | 2603 | return lwpid_of (event_thread); |
0d62e5e8 DJ |
2604 | } |
2605 | ||
fa96cb38 PA |
2606 | /* But if we don't find a pending event, we'll have to wait. |
2607 | ||
2608 | We only enter this loop if no process has a pending wait status. | |
2609 | Thus any action taken in response to a wait status inside this | |
2610 | loop is responding as soon as we detect the status, not after any | |
2611 | pending events. */ | |
d8301ad1 | 2612 | |
fa96cb38 PA |
2613 | /* Make sure SIGCHLD is blocked until the sigsuspend below. Block |
2614 | all signals while here. */ | |
2615 | sigfillset (&block_mask); | |
21987b9c | 2616 | gdb_sigmask (SIG_BLOCK, &block_mask, &prev_mask); |
fa96cb38 | 2617 | |
582511be PA |
2618 | /* Always pull all events out of the kernel. We'll randomly select |
2619 | an event LWP out of all that have events, to prevent | |
2620 | starvation. */ | |
fa96cb38 | 2621 | while (event_child == NULL) |
0d62e5e8 | 2622 | { |
fa96cb38 | 2623 | pid_t ret = 0; |
0d62e5e8 | 2624 | |
fa96cb38 PA |
2625 | /* Always use -1 and WNOHANG, due to couple of a kernel/ptrace |
2626 | quirks: | |
0d62e5e8 | 2627 | |
fa96cb38 PA |
2628 | - If the thread group leader exits while other threads in the |
2629 | thread group still exist, waitpid(TGID, ...) hangs. That | |
2630 | waitpid won't return an exit status until the other threads | |
2631 | in the group are reaped. | |
611cb4a5 | 2632 | |
fa96cb38 PA |
2633 | - When a non-leader thread execs, that thread just vanishes |
2634 | without reporting an exit (so we'd hang if we waited for it | |
2635 | explicitly in that case). The exec event is reported to | |
94585166 | 2636 | the TGID pid. */ |
fa96cb38 PA |
2637 | errno = 0; |
2638 | ret = my_waitpid (-1, wstatp, options | WNOHANG); | |
d8301ad1 | 2639 | |
fa96cb38 PA |
2640 | if (debug_threads) |
2641 | debug_printf ("LWFE: waitpid(-1, ...) returned %d, %s\n", | |
6d91ce9a | 2642 | ret, errno ? safe_strerror (errno) : "ERRNO-OK"); |
0d62e5e8 | 2643 | |
fa96cb38 | 2644 | if (ret > 0) |
0d62e5e8 | 2645 | { |
89be2091 | 2646 | if (debug_threads) |
bd99dc85 | 2647 | { |
fa96cb38 PA |
2648 | debug_printf ("LLW: waitpid %ld received %s\n", |
2649 | (long) ret, status_to_str (*wstatp)); | |
bd99dc85 | 2650 | } |
89be2091 | 2651 | |
582511be PA |
2652 | /* Filter all events. IOW, leave all events pending. We'll |
2653 | randomly select an event LWP out of all that have events | |
2654 | below. */ | |
d16f3f6c | 2655 | filter_event (ret, *wstatp); |
fa96cb38 PA |
2656 | /* Retry until nothing comes out of waitpid. A single |
2657 | SIGCHLD can indicate more than one child stopped. */ | |
89be2091 DJ |
2658 | continue; |
2659 | } | |
2660 | ||
20ba1ce6 PA |
2661 | /* Now that we've pulled all events out of the kernel, resume |
2662 | LWPs that don't have an interesting event to report. */ | |
2663 | if (stopping_threads == NOT_STOPPING_THREADS) | |
df95181f TBA |
2664 | for_each_thread ([this] (thread_info *thread) |
2665 | { | |
2666 | resume_stopped_resumed_lwps (thread); | |
2667 | }); | |
20ba1ce6 PA |
2668 | |
2669 | /* ... and find an LWP with a status to report to the core, if | |
2670 | any. */ | |
83e1b6c1 SM |
2671 | event_thread = find_thread_in_random ([&] (thread_info *thread) |
2672 | { | |
2673 | return status_pending_p_callback (thread, filter_ptid); | |
2674 | }); | |
2675 | ||
582511be PA |
2676 | if (event_thread != NULL) |
2677 | { | |
2678 | event_child = get_thread_lwp (event_thread); | |
2679 | *wstatp = event_child->status_pending; | |
2680 | event_child->status_pending_p = 0; | |
2681 | event_child->status_pending = 0; | |
2682 | break; | |
2683 | } | |
2684 | ||
fa96cb38 PA |
2685 | /* Check for zombie thread group leaders. Those can't be reaped |
2686 | until all other threads in the thread group are. */ | |
2687 | check_zombie_leaders (); | |
2688 | ||
a1385b7b SM |
2689 | auto not_stopped = [&] (thread_info *thread) |
2690 | { | |
2691 | return not_stopped_callback (thread, wait_ptid); | |
2692 | }; | |
2693 | ||
fa96cb38 PA |
2694 | /* If there are no resumed children left in the set of LWPs we |
2695 | want to wait for, bail. We can't just block in | |
2696 | waitpid/sigsuspend, because lwps might have been left stopped | |
2697 | in trace-stop state, and we'd be stuck forever waiting for | |
2698 | their status to change (which would only happen if we resumed | |
2699 | them). Even if WNOHANG is set, this return code is preferred | |
2700 | over 0 (below), as it is more detailed. */ | |
a1385b7b | 2701 | if (find_thread (not_stopped) == NULL) |
a6dbe5df | 2702 | { |
fa96cb38 PA |
2703 | if (debug_threads) |
2704 | debug_printf ("LLW: exit (no unwaited-for LWP)\n"); | |
21987b9c | 2705 | gdb_sigmask (SIG_SETMASK, &prev_mask, NULL); |
fa96cb38 | 2706 | return -1; |
a6dbe5df PA |
2707 | } |
2708 | ||
fa96cb38 PA |
2709 | /* No interesting event to report to the caller. */ |
2710 | if ((options & WNOHANG)) | |
24a09b5f | 2711 | { |
fa96cb38 PA |
2712 | if (debug_threads) |
2713 | debug_printf ("WNOHANG set, no event found\n"); | |
2714 | ||
21987b9c | 2715 | gdb_sigmask (SIG_SETMASK, &prev_mask, NULL); |
fa96cb38 | 2716 | return 0; |
24a09b5f DJ |
2717 | } |
2718 | ||
fa96cb38 PA |
2719 | /* Block until we get an event reported with SIGCHLD. */ |
2720 | if (debug_threads) | |
2721 | debug_printf ("sigsuspend'ing\n"); | |
d50171e4 | 2722 | |
fa96cb38 | 2723 | sigsuspend (&prev_mask); |
21987b9c | 2724 | gdb_sigmask (SIG_SETMASK, &prev_mask, NULL); |
fa96cb38 PA |
2725 | goto retry; |
2726 | } | |
d50171e4 | 2727 | |
21987b9c | 2728 | gdb_sigmask (SIG_SETMASK, &prev_mask, NULL); |
d50171e4 | 2729 | |
0bfdf32f | 2730 | current_thread = event_thread; |
d50171e4 | 2731 | |
fa96cb38 PA |
2732 | return lwpid_of (event_thread); |
2733 | } | |
2734 | ||
d16f3f6c TBA |
2735 | int |
2736 | linux_process_target::wait_for_event (ptid_t ptid, int *wstatp, int options) | |
fa96cb38 | 2737 | { |
d16f3f6c | 2738 | return wait_for_event_filtered (ptid, ptid, wstatp, options); |
611cb4a5 DJ |
2739 | } |
2740 | ||
6bf5e0ba PA |
2741 | /* Select one LWP out of those that have events pending. */ |
2742 | ||
2743 | static void | |
2744 | select_event_lwp (struct lwp_info **orig_lp) | |
2745 | { | |
582511be PA |
2746 | struct thread_info *event_thread = NULL; |
2747 | ||
2748 | /* In all-stop, give preference to the LWP that is being | |
2749 | single-stepped. There will be at most one, and it's the LWP that | |
2750 | the core is most interested in. If we didn't do this, then we'd | |
2751 | have to handle pending step SIGTRAPs somehow in case the core | |
2752 | later continues the previously-stepped thread, otherwise we'd | |
2753 | report the pending SIGTRAP, and the core, not having stepped the | |
2754 | thread, wouldn't understand what the trap was for, and therefore | |
2755 | would report it to the user as a random signal. */ | |
2756 | if (!non_stop) | |
6bf5e0ba | 2757 | { |
39a64da5 SM |
2758 | event_thread = find_thread ([] (thread_info *thread) |
2759 | { | |
2760 | lwp_info *lp = get_thread_lwp (thread); | |
2761 | ||
2762 | return (thread->last_status.kind == TARGET_WAITKIND_IGNORE | |
2763 | && thread->last_resume_kind == resume_step | |
2764 | && lp->status_pending_p); | |
2765 | }); | |
2766 | ||
582511be PA |
2767 | if (event_thread != NULL) |
2768 | { | |
2769 | if (debug_threads) | |
2770 | debug_printf ("SEL: Select single-step %s\n", | |
2771 | target_pid_to_str (ptid_of (event_thread))); | |
2772 | } | |
6bf5e0ba | 2773 | } |
582511be | 2774 | if (event_thread == NULL) |
6bf5e0ba PA |
2775 | { |
2776 | /* No single-stepping LWP. Select one at random, out of those | |
b90fc188 | 2777 | which have had events. */ |
6bf5e0ba | 2778 | |
b0319eaa | 2779 | event_thread = find_thread_in_random ([&] (thread_info *thread) |
39a64da5 SM |
2780 | { |
2781 | lwp_info *lp = get_thread_lwp (thread); | |
2782 | ||
b0319eaa TT |
2783 | /* Only resumed LWPs that have an event pending. */ |
2784 | return (thread->last_status.kind == TARGET_WAITKIND_IGNORE | |
2785 | && lp->status_pending_p); | |
39a64da5 | 2786 | }); |
6bf5e0ba PA |
2787 | } |
2788 | ||
d86d4aaf | 2789 | if (event_thread != NULL) |
6bf5e0ba | 2790 | { |
d86d4aaf DE |
2791 | struct lwp_info *event_lp = get_thread_lwp (event_thread); |
2792 | ||
6bf5e0ba PA |
2793 | /* Switch the event LWP. */ |
2794 | *orig_lp = event_lp; | |
2795 | } | |
2796 | } | |
2797 | ||
7984d532 PA |
2798 | /* Decrement the suspend count of all LWPs, except EXCEPT, if non |
2799 | NULL. */ | |
2800 | ||
2801 | static void | |
2802 | unsuspend_all_lwps (struct lwp_info *except) | |
2803 | { | |
139720c5 SM |
2804 | for_each_thread ([&] (thread_info *thread) |
2805 | { | |
2806 | lwp_info *lwp = get_thread_lwp (thread); | |
2807 | ||
2808 | if (lwp != except) | |
2809 | lwp_suspended_decr (lwp); | |
2810 | }); | |
7984d532 PA |
2811 | } |
2812 | ||
5a6b0a41 | 2813 | static bool lwp_running (thread_info *thread); |
fa593d66 PA |
2814 | |
2815 | /* Stabilize threads (move out of jump pads). | |
2816 | ||
2817 | If a thread is midway collecting a fast tracepoint, we need to | |
2818 | finish the collection and move it out of the jump pad before | |
2819 | reporting the signal. | |
2820 | ||
2821 | This avoids recursion while collecting (when a signal arrives | |
2822 | midway, and the signal handler itself collects), which would trash | |
2823 | the trace buffer. In case the user set a breakpoint in a signal | |
2824 | handler, this avoids the backtrace showing the jump pad, etc.. | |
2825 | Most importantly, there are certain things we can't do safely if | |
2826 | threads are stopped in a jump pad (or in its callee's). For | |
2827 | example: | |
2828 | ||
2829 | - starting a new trace run. A thread still collecting the | |
2830 | previous run, could trash the trace buffer when resumed. The trace | |
2831 | buffer control structures would have been reset but the thread had | |
2832 | no way to tell. The thread could even midway memcpy'ing to the | |
2833 | buffer, which would mean that when resumed, it would clobber the | |
2834 | trace buffer that had been set for a new run. | |
2835 | ||
2836 | - we can't rewrite/reuse the jump pads for new tracepoints | |
2837 | safely. Say you do tstart while a thread is stopped midway while | |
2838 | collecting. When the thread is later resumed, it finishes the | |
2839 | collection, and returns to the jump pad, to execute the original | |
2840 | instruction that was under the tracepoint jump at the time the | |
2841 | older run had been started. If the jump pad had been rewritten | |
2842 | since for something else in the new run, the thread would now | |
2843 | execute the wrong / random instructions. */ | |
2844 | ||
5c9eb2f2 TBA |
2845 | void |
2846 | linux_process_target::stabilize_threads () | |
fa593d66 | 2847 | { |
13e567af TBA |
2848 | thread_info *thread_stuck = find_thread ([this] (thread_info *thread) |
2849 | { | |
2850 | return stuck_in_jump_pad (thread); | |
2851 | }); | |
fa593d66 | 2852 | |
d86d4aaf | 2853 | if (thread_stuck != NULL) |
fa593d66 | 2854 | { |
b4d51a55 | 2855 | if (debug_threads) |
87ce2a04 | 2856 | debug_printf ("can't stabilize, LWP %ld is stuck in jump pad\n", |
d86d4aaf | 2857 | lwpid_of (thread_stuck)); |
fa593d66 PA |
2858 | return; |
2859 | } | |
2860 | ||
fcb056a5 | 2861 | thread_info *saved_thread = current_thread; |
fa593d66 PA |
2862 | |
2863 | stabilizing_threads = 1; | |
2864 | ||
2865 | /* Kick 'em all. */ | |
d16f3f6c TBA |
2866 | for_each_thread ([this] (thread_info *thread) |
2867 | { | |
2868 | move_out_of_jump_pad (thread); | |
2869 | }); | |
fa593d66 PA |
2870 | |
2871 | /* Loop until all are stopped out of the jump pads. */ | |
5a6b0a41 | 2872 | while (find_thread (lwp_running) != NULL) |
fa593d66 PA |
2873 | { |
2874 | struct target_waitstatus ourstatus; | |
2875 | struct lwp_info *lwp; | |
fa593d66 PA |
2876 | int wstat; |
2877 | ||
2878 | /* Note that we go through the full wait even loop. While | |
2879 | moving threads out of jump pad, we need to be able to step | |
2880 | over internal breakpoints and such. */ | |
d16f3f6c | 2881 | wait_1 (minus_one_ptid, &ourstatus, 0); |
fa593d66 PA |
2882 | |
2883 | if (ourstatus.kind == TARGET_WAITKIND_STOPPED) | |
2884 | { | |
0bfdf32f | 2885 | lwp = get_thread_lwp (current_thread); |
fa593d66 PA |
2886 | |
2887 | /* Lock it. */ | |
863d01bd | 2888 | lwp_suspended_inc (lwp); |
fa593d66 | 2889 | |
a493e3e2 | 2890 | if (ourstatus.value.sig != GDB_SIGNAL_0 |
0bfdf32f | 2891 | || current_thread->last_resume_kind == resume_stop) |
fa593d66 | 2892 | { |
2ea28649 | 2893 | wstat = W_STOPCODE (gdb_signal_to_host (ourstatus.value.sig)); |
fa593d66 PA |
2894 | enqueue_one_deferred_signal (lwp, &wstat); |
2895 | } | |
2896 | } | |
2897 | } | |
2898 | ||
fcdad592 | 2899 | unsuspend_all_lwps (NULL); |
fa593d66 PA |
2900 | |
2901 | stabilizing_threads = 0; | |
2902 | ||
0bfdf32f | 2903 | current_thread = saved_thread; |
fa593d66 | 2904 | |
b4d51a55 | 2905 | if (debug_threads) |
fa593d66 | 2906 | { |
13e567af TBA |
2907 | thread_stuck = find_thread ([this] (thread_info *thread) |
2908 | { | |
2909 | return stuck_in_jump_pad (thread); | |
2910 | }); | |
fcb056a5 | 2911 | |
d86d4aaf | 2912 | if (thread_stuck != NULL) |
87ce2a04 | 2913 | debug_printf ("couldn't stabilize, LWP %ld got stuck in jump pad\n", |
d86d4aaf | 2914 | lwpid_of (thread_stuck)); |
fa593d66 PA |
2915 | } |
2916 | } | |
2917 | ||
582511be PA |
2918 | /* Convenience function that is called when the kernel reports an |
2919 | event that is not passed out to GDB. */ | |
2920 | ||
2921 | static ptid_t | |
2922 | ignore_event (struct target_waitstatus *ourstatus) | |
2923 | { | |
2924 | /* If we got an event, there may still be others, as a single | |
2925 | SIGCHLD can indicate more than one child stopped. This forces | |
2926 | another target_wait call. */ | |
2927 | async_file_mark (); | |
2928 | ||
2929 | ourstatus->kind = TARGET_WAITKIND_IGNORE; | |
2930 | return null_ptid; | |
2931 | } | |
2932 | ||
fd000fb3 TBA |
2933 | ptid_t |
2934 | linux_process_target::filter_exit_event (lwp_info *event_child, | |
2935 | target_waitstatus *ourstatus) | |
65706a29 | 2936 | { |
c12a5089 | 2937 | client_state &cs = get_client_state (); |
65706a29 PA |
2938 | struct thread_info *thread = get_lwp_thread (event_child); |
2939 | ptid_t ptid = ptid_of (thread); | |
2940 | ||
2941 | if (!last_thread_of_process_p (pid_of (thread))) | |
2942 | { | |
c12a5089 | 2943 | if (cs.report_thread_events) |
65706a29 PA |
2944 | ourstatus->kind = TARGET_WAITKIND_THREAD_EXITED; |
2945 | else | |
2946 | ourstatus->kind = TARGET_WAITKIND_IGNORE; | |
2947 | ||
2948 | delete_lwp (event_child); | |
2949 | } | |
2950 | return ptid; | |
2951 | } | |
2952 | ||
82075af2 JS |
2953 | /* Returns 1 if GDB is interested in any event_child syscalls. */ |
2954 | ||
2955 | static int | |
2956 | gdb_catching_syscalls_p (struct lwp_info *event_child) | |
2957 | { | |
2958 | struct thread_info *thread = get_lwp_thread (event_child); | |
2959 | struct process_info *proc = get_thread_process (thread); | |
2960 | ||
f27866ba | 2961 | return !proc->syscalls_to_catch.empty (); |
82075af2 JS |
2962 | } |
2963 | ||
2964 | /* Returns 1 if GDB is interested in the event_child syscall. | |
2965 | Only to be called when stopped reason is SYSCALL_SIGTRAP. */ | |
2966 | ||
2967 | static int | |
2968 | gdb_catch_this_syscall_p (struct lwp_info *event_child) | |
2969 | { | |
4cc32bec | 2970 | int sysno; |
82075af2 JS |
2971 | struct thread_info *thread = get_lwp_thread (event_child); |
2972 | struct process_info *proc = get_thread_process (thread); | |
2973 | ||
f27866ba | 2974 | if (proc->syscalls_to_catch.empty ()) |
82075af2 JS |
2975 | return 0; |
2976 | ||
f27866ba | 2977 | if (proc->syscalls_to_catch[0] == ANY_SYSCALL) |
82075af2 JS |
2978 | return 1; |
2979 | ||
4cc32bec | 2980 | get_syscall_trapinfo (event_child, &sysno); |
f27866ba SM |
2981 | |
2982 | for (int iter : proc->syscalls_to_catch) | |
82075af2 JS |
2983 | if (iter == sysno) |
2984 | return 1; | |
2985 | ||
2986 | return 0; | |
2987 | } | |
2988 | ||
d16f3f6c TBA |
2989 | ptid_t |
2990 | linux_process_target::wait_1 (ptid_t ptid, target_waitstatus *ourstatus, | |
2991 | int target_options) | |
da6d8c04 | 2992 | { |
c12a5089 | 2993 | client_state &cs = get_client_state (); |
e5f1222d | 2994 | int w; |
fc7238bb | 2995 | struct lwp_info *event_child; |
bd99dc85 | 2996 | int options; |
bd99dc85 | 2997 | int pid; |
6bf5e0ba PA |
2998 | int step_over_finished; |
2999 | int bp_explains_trap; | |
3000 | int maybe_internal_trap; | |
3001 | int report_to_gdb; | |
219f2f23 | 3002 | int trace_event; |
c2d6af84 | 3003 | int in_step_range; |
f2faf941 | 3004 | int any_resumed; |
bd99dc85 | 3005 | |
87ce2a04 DE |
3006 | if (debug_threads) |
3007 | { | |
3008 | debug_enter (); | |
d16f3f6c | 3009 | debug_printf ("wait_1: [%s]\n", target_pid_to_str (ptid)); |
87ce2a04 DE |
3010 | } |
3011 | ||
bd99dc85 PA |
3012 | /* Translate generic target options into linux options. */ |
3013 | options = __WALL; | |
3014 | if (target_options & TARGET_WNOHANG) | |
3015 | options |= WNOHANG; | |
0d62e5e8 | 3016 | |
fa593d66 PA |
3017 | bp_explains_trap = 0; |
3018 | trace_event = 0; | |
c2d6af84 | 3019 | in_step_range = 0; |
bd99dc85 PA |
3020 | ourstatus->kind = TARGET_WAITKIND_IGNORE; |
3021 | ||
83e1b6c1 SM |
3022 | auto status_pending_p_any = [&] (thread_info *thread) |
3023 | { | |
3024 | return status_pending_p_callback (thread, minus_one_ptid); | |
3025 | }; | |
3026 | ||
a1385b7b SM |
3027 | auto not_stopped = [&] (thread_info *thread) |
3028 | { | |
3029 | return not_stopped_callback (thread, minus_one_ptid); | |
3030 | }; | |
3031 | ||
f2faf941 | 3032 | /* Find a resumed LWP, if any. */ |
83e1b6c1 | 3033 | if (find_thread (status_pending_p_any) != NULL) |
f2faf941 | 3034 | any_resumed = 1; |
a1385b7b | 3035 | else if (find_thread (not_stopped) != NULL) |
f2faf941 PA |
3036 | any_resumed = 1; |
3037 | else | |
3038 | any_resumed = 0; | |
3039 | ||
d7e15655 | 3040 | if (step_over_bkpt == null_ptid) |
d16f3f6c | 3041 | pid = wait_for_event (ptid, &w, options); |
6bf5e0ba PA |
3042 | else |
3043 | { | |
3044 | if (debug_threads) | |
87ce2a04 DE |
3045 | debug_printf ("step_over_bkpt set [%s], doing a blocking wait\n", |
3046 | target_pid_to_str (step_over_bkpt)); | |
d16f3f6c | 3047 | pid = wait_for_event (step_over_bkpt, &w, options & ~WNOHANG); |
6bf5e0ba PA |
3048 | } |
3049 | ||
f2faf941 | 3050 | if (pid == 0 || (pid == -1 && !any_resumed)) |
87ce2a04 | 3051 | { |
fa96cb38 PA |
3052 | gdb_assert (target_options & TARGET_WNOHANG); |
3053 | ||
87ce2a04 DE |
3054 | if (debug_threads) |
3055 | { | |
d16f3f6c | 3056 | debug_printf ("wait_1 ret = null_ptid, " |
fa96cb38 | 3057 | "TARGET_WAITKIND_IGNORE\n"); |
87ce2a04 DE |
3058 | debug_exit (); |
3059 | } | |
fa96cb38 PA |
3060 | |
3061 | ourstatus->kind = TARGET_WAITKIND_IGNORE; | |
87ce2a04 DE |
3062 | return null_ptid; |
3063 | } | |
fa96cb38 PA |
3064 | else if (pid == -1) |
3065 | { | |
3066 | if (debug_threads) | |
3067 | { | |
d16f3f6c | 3068 | debug_printf ("wait_1 ret = null_ptid, " |
fa96cb38 PA |
3069 | "TARGET_WAITKIND_NO_RESUMED\n"); |
3070 | debug_exit (); | |
3071 | } | |
bd99dc85 | 3072 | |
fa96cb38 PA |
3073 | ourstatus->kind = TARGET_WAITKIND_NO_RESUMED; |
3074 | return null_ptid; | |
3075 | } | |
0d62e5e8 | 3076 | |
0bfdf32f | 3077 | event_child = get_thread_lwp (current_thread); |
0d62e5e8 | 3078 | |
d16f3f6c | 3079 | /* wait_for_event only returns an exit status for the last |
fa96cb38 PA |
3080 | child of a process. Report it. */ |
3081 | if (WIFEXITED (w) || WIFSIGNALED (w)) | |
da6d8c04 | 3082 | { |
fa96cb38 | 3083 | if (WIFEXITED (w)) |
0d62e5e8 | 3084 | { |
fa96cb38 PA |
3085 | ourstatus->kind = TARGET_WAITKIND_EXITED; |
3086 | ourstatus->value.integer = WEXITSTATUS (w); | |
bd99dc85 | 3087 | |
fa96cb38 | 3088 | if (debug_threads) |
bd99dc85 | 3089 | { |
d16f3f6c | 3090 | debug_printf ("wait_1 ret = %s, exited with " |
fa96cb38 | 3091 | "retcode %d\n", |
0bfdf32f | 3092 | target_pid_to_str (ptid_of (current_thread)), |
fa96cb38 PA |
3093 | WEXITSTATUS (w)); |
3094 | debug_exit (); | |
bd99dc85 | 3095 | } |
fa96cb38 PA |
3096 | } |
3097 | else | |
3098 | { | |
3099 | ourstatus->kind = TARGET_WAITKIND_SIGNALLED; | |
3100 | ourstatus->value.sig = gdb_signal_from_host (WTERMSIG (w)); | |
5b1c542e | 3101 | |
fa96cb38 PA |
3102 | if (debug_threads) |
3103 | { | |
d16f3f6c | 3104 | debug_printf ("wait_1 ret = %s, terminated with " |
fa96cb38 | 3105 | "signal %d\n", |
0bfdf32f | 3106 | target_pid_to_str (ptid_of (current_thread)), |
fa96cb38 PA |
3107 | WTERMSIG (w)); |
3108 | debug_exit (); | |
3109 | } | |
0d62e5e8 | 3110 | } |
fa96cb38 | 3111 | |
65706a29 PA |
3112 | if (ourstatus->kind == TARGET_WAITKIND_EXITED) |
3113 | return filter_exit_event (event_child, ourstatus); | |
3114 | ||
0bfdf32f | 3115 | return ptid_of (current_thread); |
da6d8c04 DJ |
3116 | } |
3117 | ||
2d97cd35 AT |
3118 | /* If step-over executes a breakpoint instruction, in the case of a |
3119 | hardware single step it means a gdb/gdbserver breakpoint had been | |
3120 | planted on top of a permanent breakpoint, in the case of a software | |
3121 | single step it may just mean that gdbserver hit the reinsert breakpoint. | |
e7ad2f14 | 3122 | The PC has been adjusted by save_stop_reason to point at |
2d97cd35 AT |
3123 | the breakpoint address. |
3124 | So in the case of the hardware single step advance the PC manually | |
3125 | past the breakpoint and in the case of software single step advance only | |
3b9a79ef | 3126 | if it's not the single_step_breakpoint we are hitting. |
2d97cd35 AT |
3127 | This avoids that a program would keep trapping a permanent breakpoint |
3128 | forever. */ | |
d7e15655 | 3129 | if (step_over_bkpt != null_ptid |
2d97cd35 AT |
3130 | && event_child->stop_reason == TARGET_STOPPED_BY_SW_BREAKPOINT |
3131 | && (event_child->stepping | |
3b9a79ef | 3132 | || !single_step_breakpoint_inserted_here (event_child->stop_pc))) |
8090aef2 | 3133 | { |
dd373349 AT |
3134 | int increment_pc = 0; |
3135 | int breakpoint_kind = 0; | |
3136 | CORE_ADDR stop_pc = event_child->stop_pc; | |
3137 | ||
d16f3f6c TBA |
3138 | breakpoint_kind = breakpoint_kind_from_current_state (&stop_pc); |
3139 | sw_breakpoint_from_kind (breakpoint_kind, &increment_pc); | |
8090aef2 PA |
3140 | |
3141 | if (debug_threads) | |
3142 | { | |
3143 | debug_printf ("step-over for %s executed software breakpoint\n", | |
3144 | target_pid_to_str (ptid_of (current_thread))); | |
3145 | } | |
3146 | ||
3147 | if (increment_pc != 0) | |
3148 | { | |
3149 | struct regcache *regcache | |
3150 | = get_thread_regcache (current_thread, 1); | |
3151 | ||
3152 | event_child->stop_pc += increment_pc; | |
bf9ae9d8 | 3153 | low_set_pc (regcache, event_child->stop_pc); |
8090aef2 | 3154 | |
d7146cda | 3155 | if (!low_breakpoint_at (event_child->stop_pc)) |
15c66dd6 | 3156 | event_child->stop_reason = TARGET_STOPPED_BY_NO_REASON; |
8090aef2 PA |
3157 | } |
3158 | } | |
3159 | ||
6bf5e0ba PA |
3160 | /* If this event was not handled before, and is not a SIGTRAP, we |
3161 | report it. SIGILL and SIGSEGV are also treated as traps in case | |
3162 | a breakpoint is inserted at the current PC. If this target does | |
3163 | not support internal breakpoints at all, we also report the | |
3164 | SIGTRAP without further processing; it's of no concern to us. */ | |
3165 | maybe_internal_trap | |
bf9ae9d8 | 3166 | = (low_supports_breakpoints () |
6bf5e0ba PA |
3167 | && (WSTOPSIG (w) == SIGTRAP |
3168 | || ((WSTOPSIG (w) == SIGILL | |
3169 | || WSTOPSIG (w) == SIGSEGV) | |
d7146cda | 3170 | && low_breakpoint_at (event_child->stop_pc)))); |
6bf5e0ba PA |
3171 | |
3172 | if (maybe_internal_trap) | |
3173 | { | |
3174 | /* Handle anything that requires bookkeeping before deciding to | |
3175 | report the event or continue waiting. */ | |
3176 | ||
3177 | /* First check if we can explain the SIGTRAP with an internal | |
3178 | breakpoint, or if we should possibly report the event to GDB. | |
3179 | Do this before anything that may remove or insert a | |
3180 | breakpoint. */ | |
3181 | bp_explains_trap = breakpoint_inserted_here (event_child->stop_pc); | |
3182 | ||
3183 | /* We have a SIGTRAP, possibly a step-over dance has just | |
3184 | finished. If so, tweak the state machine accordingly, | |
3b9a79ef YQ |
3185 | reinsert breakpoints and delete any single-step |
3186 | breakpoints. */ | |
6bf5e0ba PA |
3187 | step_over_finished = finish_step_over (event_child); |
3188 | ||
3189 | /* Now invoke the callbacks of any internal breakpoints there. */ | |
3190 | check_breakpoints (event_child->stop_pc); | |
3191 | ||
219f2f23 PA |
3192 | /* Handle tracepoint data collecting. This may overflow the |
3193 | trace buffer, and cause a tracing stop, removing | |
3194 | breakpoints. */ | |
3195 | trace_event = handle_tracepoints (event_child); | |
3196 | ||
6bf5e0ba PA |
3197 | if (bp_explains_trap) |
3198 | { | |
6bf5e0ba | 3199 | if (debug_threads) |
87ce2a04 | 3200 | debug_printf ("Hit a gdbserver breakpoint.\n"); |
6bf5e0ba PA |
3201 | } |
3202 | } | |
3203 | else | |
3204 | { | |
3205 | /* We have some other signal, possibly a step-over dance was in | |
3206 | progress, and it should be cancelled too. */ | |
3207 | step_over_finished = finish_step_over (event_child); | |
fa593d66 PA |
3208 | } |
3209 | ||
3210 | /* We have all the data we need. Either report the event to GDB, or | |
3211 | resume threads and keep waiting for more. */ | |
3212 | ||
3213 | /* If we're collecting a fast tracepoint, finish the collection and | |
3214 | move out of the jump pad before delivering a signal. See | |
3215 | linux_stabilize_threads. */ | |
3216 | ||
3217 | if (WIFSTOPPED (w) | |
3218 | && WSTOPSIG (w) != SIGTRAP | |
3219 | && supports_fast_tracepoints () | |
58b4daa5 | 3220 | && agent_loaded_p ()) |
fa593d66 PA |
3221 | { |
3222 | if (debug_threads) | |
87ce2a04 DE |
3223 | debug_printf ("Got signal %d for LWP %ld. Check if we need " |
3224 | "to defer or adjust it.\n", | |
0bfdf32f | 3225 | WSTOPSIG (w), lwpid_of (current_thread)); |
fa593d66 PA |
3226 | |
3227 | /* Allow debugging the jump pad itself. */ | |
0bfdf32f | 3228 | if (current_thread->last_resume_kind != resume_step |
fa593d66 PA |
3229 | && maybe_move_out_of_jump_pad (event_child, &w)) |
3230 | { | |
3231 | enqueue_one_deferred_signal (event_child, &w); | |
3232 | ||
3233 | if (debug_threads) | |
87ce2a04 | 3234 | debug_printf ("Signal %d for LWP %ld deferred (in jump pad)\n", |
0bfdf32f | 3235 | WSTOPSIG (w), lwpid_of (current_thread)); |
fa593d66 | 3236 | |
df95181f | 3237 | resume_one_lwp (event_child, 0, 0, NULL); |
582511be | 3238 | |
edeeb602 YQ |
3239 | if (debug_threads) |
3240 | debug_exit (); | |
582511be | 3241 | return ignore_event (ourstatus); |
fa593d66 PA |
3242 | } |
3243 | } | |
219f2f23 | 3244 | |
229d26fc SM |
3245 | if (event_child->collecting_fast_tracepoint |
3246 | != fast_tpoint_collect_result::not_collecting) | |
fa593d66 PA |
3247 | { |
3248 | if (debug_threads) | |
87ce2a04 DE |
3249 | debug_printf ("LWP %ld was trying to move out of the jump pad (%d). " |
3250 | "Check if we're already there.\n", | |
0bfdf32f | 3251 | lwpid_of (current_thread), |
229d26fc | 3252 | (int) event_child->collecting_fast_tracepoint); |
fa593d66 PA |
3253 | |
3254 | trace_event = 1; | |
3255 | ||
3256 | event_child->collecting_fast_tracepoint | |
3257 | = linux_fast_tracepoint_collecting (event_child, NULL); | |
3258 | ||
229d26fc SM |
3259 | if (event_child->collecting_fast_tracepoint |
3260 | != fast_tpoint_collect_result::before_insn) | |
fa593d66 PA |
3261 | { |
3262 | /* No longer need this breakpoint. */ | |
3263 | if (event_child->exit_jump_pad_bkpt != NULL) | |
3264 | { | |
3265 | if (debug_threads) | |
87ce2a04 DE |
3266 | debug_printf ("No longer need exit-jump-pad bkpt; removing it." |
3267 | "stopping all threads momentarily.\n"); | |
fa593d66 PA |
3268 | |
3269 | /* Other running threads could hit this breakpoint. | |
3270 | We don't handle moribund locations like GDB does, | |
3271 | instead we always pause all threads when removing | |
3272 | breakpoints, so that any step-over or | |
3273 | decr_pc_after_break adjustment is always taken | |
3274 | care of while the breakpoint is still | |
3275 | inserted. */ | |
3276 | stop_all_lwps (1, event_child); | |
fa593d66 PA |
3277 | |
3278 | delete_breakpoint (event_child->exit_jump_pad_bkpt); | |
3279 | event_child->exit_jump_pad_bkpt = NULL; | |
3280 | ||
3281 | unstop_all_lwps (1, event_child); | |
3282 | ||
3283 | gdb_assert (event_child->suspended >= 0); | |
3284 | } | |
3285 | } | |
3286 | ||
229d26fc SM |
3287 | if (event_child->collecting_fast_tracepoint |
3288 | == fast_tpoint_collect_result::not_collecting) | |
fa593d66 PA |
3289 | { |
3290 | if (debug_threads) | |
87ce2a04 DE |
3291 | debug_printf ("fast tracepoint finished " |
3292 | "collecting successfully.\n"); | |
fa593d66 PA |
3293 | |
3294 | /* We may have a deferred signal to report. */ | |
3295 | if (dequeue_one_deferred_signal (event_child, &w)) | |
3296 | { | |
3297 | if (debug_threads) | |
87ce2a04 | 3298 | debug_printf ("dequeued one signal.\n"); |
fa593d66 | 3299 | } |
3c11dd79 | 3300 | else |
fa593d66 | 3301 | { |
3c11dd79 | 3302 | if (debug_threads) |
87ce2a04 | 3303 | debug_printf ("no deferred signals.\n"); |
fa593d66 PA |
3304 | |
3305 | if (stabilizing_threads) | |
3306 | { | |
3307 | ourstatus->kind = TARGET_WAITKIND_STOPPED; | |
a493e3e2 | 3308 | ourstatus->value.sig = GDB_SIGNAL_0; |
87ce2a04 DE |
3309 | |
3310 | if (debug_threads) | |
3311 | { | |
d16f3f6c | 3312 | debug_printf ("wait_1 ret = %s, stopped " |
87ce2a04 | 3313 | "while stabilizing threads\n", |
0bfdf32f | 3314 | target_pid_to_str (ptid_of (current_thread))); |
87ce2a04 DE |
3315 | debug_exit (); |
3316 | } | |
3317 | ||
0bfdf32f | 3318 | return ptid_of (current_thread); |
fa593d66 PA |
3319 | } |
3320 | } | |
3321 | } | |
6bf5e0ba PA |
3322 | } |
3323 | ||
e471f25b PA |
3324 | /* Check whether GDB would be interested in this event. */ |
3325 | ||
82075af2 JS |
3326 | /* Check if GDB is interested in this syscall. */ |
3327 | if (WIFSTOPPED (w) | |
3328 | && WSTOPSIG (w) == SYSCALL_SIGTRAP | |
3329 | && !gdb_catch_this_syscall_p (event_child)) | |
3330 | { | |
3331 | if (debug_threads) | |
3332 | { | |
3333 | debug_printf ("Ignored syscall for LWP %ld.\n", | |
3334 | lwpid_of (current_thread)); | |
3335 | } | |
3336 | ||
df95181f | 3337 | resume_one_lwp (event_child, event_child->stepping, 0, NULL); |
edeeb602 YQ |
3338 | |
3339 | if (debug_threads) | |
3340 | debug_exit (); | |
82075af2 JS |
3341 | return ignore_event (ourstatus); |
3342 | } | |
3343 | ||
e471f25b PA |
3344 | /* If GDB is not interested in this signal, don't stop other |
3345 | threads, and don't report it to GDB. Just resume the inferior | |
3346 | right away. We do this for threading-related signals as well as | |
3347 | any that GDB specifically requested we ignore. But never ignore | |
3348 | SIGSTOP if we sent it ourselves, and do not ignore signals when | |
3349 | stepping - they may require special handling to skip the signal | |
c9587f88 AT |
3350 | handler. Also never ignore signals that could be caused by a |
3351 | breakpoint. */ | |
e471f25b | 3352 | if (WIFSTOPPED (w) |
0bfdf32f | 3353 | && current_thread->last_resume_kind != resume_step |
e471f25b | 3354 | && ( |
1a981360 | 3355 | #if defined (USE_THREAD_DB) && !defined (__ANDROID__) |
fe978cb0 | 3356 | (current_process ()->priv->thread_db != NULL |
e471f25b PA |
3357 | && (WSTOPSIG (w) == __SIGRTMIN |
3358 | || WSTOPSIG (w) == __SIGRTMIN + 1)) | |
3359 | || | |
3360 | #endif | |
c12a5089 | 3361 | (cs.pass_signals[gdb_signal_from_host (WSTOPSIG (w))] |
e471f25b | 3362 | && !(WSTOPSIG (w) == SIGSTOP |
c9587f88 AT |
3363 | && current_thread->last_resume_kind == resume_stop) |
3364 | && !linux_wstatus_maybe_breakpoint (w)))) | |
e471f25b PA |
3365 | { |
3366 | siginfo_t info, *info_p; | |
3367 | ||
3368 | if (debug_threads) | |
87ce2a04 | 3369 | debug_printf ("Ignored signal %d for LWP %ld.\n", |
0bfdf32f | 3370 | WSTOPSIG (w), lwpid_of (current_thread)); |
e471f25b | 3371 | |
0bfdf32f | 3372 | if (ptrace (PTRACE_GETSIGINFO, lwpid_of (current_thread), |
b8e1b30e | 3373 | (PTRACE_TYPE_ARG3) 0, &info) == 0) |
e471f25b PA |
3374 | info_p = &info; |
3375 | else | |
3376 | info_p = NULL; | |
863d01bd PA |
3377 | |
3378 | if (step_over_finished) | |
3379 | { | |
3380 | /* We cancelled this thread's step-over above. We still | |
3381 | need to unsuspend all other LWPs, and set them back | |
3382 | running again while the signal handler runs. */ | |
3383 | unsuspend_all_lwps (event_child); | |
3384 | ||
3385 | /* Enqueue the pending signal info so that proceed_all_lwps | |
3386 | doesn't lose it. */ | |
3387 | enqueue_pending_signal (event_child, WSTOPSIG (w), info_p); | |
3388 | ||
3389 | proceed_all_lwps (); | |
3390 | } | |
3391 | else | |
3392 | { | |
df95181f TBA |
3393 | resume_one_lwp (event_child, event_child->stepping, |
3394 | WSTOPSIG (w), info_p); | |
863d01bd | 3395 | } |
edeeb602 YQ |
3396 | |
3397 | if (debug_threads) | |
3398 | debug_exit (); | |
3399 | ||
582511be | 3400 | return ignore_event (ourstatus); |
e471f25b PA |
3401 | } |
3402 | ||
c2d6af84 PA |
3403 | /* Note that all addresses are always "out of the step range" when |
3404 | there's no range to begin with. */ | |
3405 | in_step_range = lwp_in_step_range (event_child); | |
3406 | ||
3407 | /* If GDB wanted this thread to single step, and the thread is out | |
3408 | of the step range, we always want to report the SIGTRAP, and let | |
3409 | GDB handle it. Watchpoints should always be reported. So should | |
3410 | signals we can't explain. A SIGTRAP we can't explain could be a | |
3411 | GDB breakpoint --- we may or not support Z0 breakpoints. If we | |
3412 | do, we're be able to handle GDB breakpoints on top of internal | |
3413 | breakpoints, by handling the internal breakpoint and still | |
3414 | reporting the event to GDB. If we don't, we're out of luck, GDB | |
863d01bd PA |
3415 | won't see the breakpoint hit. If we see a single-step event but |
3416 | the thread should be continuing, don't pass the trap to gdb. | |
3417 | That indicates that we had previously finished a single-step but | |
3418 | left the single-step pending -- see | |
3419 | complete_ongoing_step_over. */ | |
6bf5e0ba | 3420 | report_to_gdb = (!maybe_internal_trap |
0bfdf32f | 3421 | || (current_thread->last_resume_kind == resume_step |
c2d6af84 | 3422 | && !in_step_range) |
15c66dd6 | 3423 | || event_child->stop_reason == TARGET_STOPPED_BY_WATCHPOINT |
863d01bd PA |
3424 | || (!in_step_range |
3425 | && !bp_explains_trap | |
3426 | && !trace_event | |
3427 | && !step_over_finished | |
3428 | && !(current_thread->last_resume_kind == resume_continue | |
3429 | && event_child->stop_reason == TARGET_STOPPED_BY_SINGLE_STEP)) | |
9f3a5c85 | 3430 | || (gdb_breakpoint_here (event_child->stop_pc) |
d3ce09f5 | 3431 | && gdb_condition_true_at_breakpoint (event_child->stop_pc) |
de0d863e | 3432 | && gdb_no_commands_at_breakpoint (event_child->stop_pc)) |
00db26fa | 3433 | || event_child->waitstatus.kind != TARGET_WAITKIND_IGNORE); |
d3ce09f5 SS |
3434 | |
3435 | run_breakpoint_commands (event_child->stop_pc); | |
6bf5e0ba PA |
3436 | |
3437 | /* We found no reason GDB would want us to stop. We either hit one | |
3438 | of our own breakpoints, or finished an internal step GDB | |
3439 | shouldn't know about. */ | |
3440 | if (!report_to_gdb) | |
3441 | { | |
3442 | if (debug_threads) | |
3443 | { | |
3444 | if (bp_explains_trap) | |
87ce2a04 | 3445 | debug_printf ("Hit a gdbserver breakpoint.\n"); |
6bf5e0ba | 3446 | if (step_over_finished) |
87ce2a04 | 3447 | debug_printf ("Step-over finished.\n"); |
219f2f23 | 3448 | if (trace_event) |
87ce2a04 | 3449 | debug_printf ("Tracepoint event.\n"); |
c2d6af84 | 3450 | if (lwp_in_step_range (event_child)) |
87ce2a04 DE |
3451 | debug_printf ("Range stepping pc 0x%s [0x%s, 0x%s).\n", |
3452 | paddress (event_child->stop_pc), | |
3453 | paddress (event_child->step_range_start), | |
3454 | paddress (event_child->step_range_end)); | |
6bf5e0ba PA |
3455 | } |
3456 | ||
3457 | /* We're not reporting this breakpoint to GDB, so apply the | |
3458 | decr_pc_after_break adjustment to the inferior's regcache | |
3459 | ourselves. */ | |
3460 | ||
bf9ae9d8 | 3461 | if (low_supports_breakpoints ()) |
6bf5e0ba PA |
3462 | { |
3463 | struct regcache *regcache | |
0bfdf32f | 3464 | = get_thread_regcache (current_thread, 1); |
bf9ae9d8 | 3465 | low_set_pc (regcache, event_child->stop_pc); |
6bf5e0ba PA |
3466 | } |
3467 | ||
7984d532 | 3468 | if (step_over_finished) |
e3652c84 YQ |
3469 | { |
3470 | /* If we have finished stepping over a breakpoint, we've | |
3471 | stopped and suspended all LWPs momentarily except the | |
3472 | stepping one. This is where we resume them all again. | |
3473 | We're going to keep waiting, so use proceed, which | |
3474 | handles stepping over the next breakpoint. */ | |
3475 | unsuspend_all_lwps (event_child); | |
3476 | } | |
3477 | else | |
3478 | { | |
3479 | /* Remove the single-step breakpoints if any. Note that | |
3480 | there isn't single-step breakpoint if we finished stepping | |
3481 | over. */ | |
7582c77c | 3482 | if (supports_software_single_step () |
e3652c84 YQ |
3483 | && has_single_step_breakpoints (current_thread)) |
3484 | { | |
3485 | stop_all_lwps (0, event_child); | |
3486 | delete_single_step_breakpoints (current_thread); | |
3487 | unstop_all_lwps (0, event_child); | |
3488 | } | |
3489 | } | |
7984d532 | 3490 | |
e3652c84 YQ |
3491 | if (debug_threads) |
3492 | debug_printf ("proceeding all threads.\n"); | |
6bf5e0ba | 3493 | proceed_all_lwps (); |
edeeb602 YQ |
3494 | |
3495 | if (debug_threads) | |
3496 | debug_exit (); | |
3497 | ||
582511be | 3498 | return ignore_event (ourstatus); |
6bf5e0ba PA |
3499 | } |
3500 | ||
3501 | if (debug_threads) | |
3502 | { | |
00db26fa | 3503 | if (event_child->waitstatus.kind != TARGET_WAITKIND_IGNORE) |
ad071a30 | 3504 | { |
23fdd69e SM |
3505 | std::string str |
3506 | = target_waitstatus_to_string (&event_child->waitstatus); | |
ad071a30 | 3507 | |
ad071a30 | 3508 | debug_printf ("LWP %ld: extended event with waitstatus %s\n", |
23fdd69e | 3509 | lwpid_of (get_lwp_thread (event_child)), str.c_str ()); |
ad071a30 | 3510 | } |
0bfdf32f | 3511 | if (current_thread->last_resume_kind == resume_step) |
c2d6af84 PA |
3512 | { |
3513 | if (event_child->step_range_start == event_child->step_range_end) | |
87ce2a04 | 3514 | debug_printf ("GDB wanted to single-step, reporting event.\n"); |
c2d6af84 | 3515 | else if (!lwp_in_step_range (event_child)) |
87ce2a04 | 3516 | debug_printf ("Out of step range, reporting event.\n"); |
c2d6af84 | 3517 | } |
15c66dd6 | 3518 | if (event_child->stop_reason == TARGET_STOPPED_BY_WATCHPOINT) |
87ce2a04 | 3519 | debug_printf ("Stopped by watchpoint.\n"); |
582511be | 3520 | else if (gdb_breakpoint_here (event_child->stop_pc)) |
87ce2a04 | 3521 | debug_printf ("Stopped by GDB breakpoint.\n"); |
6bf5e0ba | 3522 | if (debug_threads) |
87ce2a04 | 3523 | debug_printf ("Hit a non-gdbserver trap event.\n"); |
6bf5e0ba PA |
3524 | } |
3525 | ||
3526 | /* Alright, we're going to report a stop. */ | |
3527 | ||
3b9a79ef | 3528 | /* Remove single-step breakpoints. */ |
7582c77c | 3529 | if (supports_software_single_step ()) |
8901d193 | 3530 | { |
3b9a79ef | 3531 | /* Remove single-step breakpoints or not. It it is true, stop all |
8901d193 YQ |
3532 | lwps, so that other threads won't hit the breakpoint in the |
3533 | staled memory. */ | |
3b9a79ef | 3534 | int remove_single_step_breakpoints_p = 0; |
8901d193 YQ |
3535 | |
3536 | if (non_stop) | |
3537 | { | |
3b9a79ef YQ |
3538 | remove_single_step_breakpoints_p |
3539 | = has_single_step_breakpoints (current_thread); | |
8901d193 YQ |
3540 | } |
3541 | else | |
3542 | { | |
3543 | /* In all-stop, a stop reply cancels all previous resume | |
3b9a79ef | 3544 | requests. Delete all single-step breakpoints. */ |
8901d193 | 3545 | |
9c80ecd6 SM |
3546 | find_thread ([&] (thread_info *thread) { |
3547 | if (has_single_step_breakpoints (thread)) | |
3548 | { | |
3549 | remove_single_step_breakpoints_p = 1; | |
3550 | return true; | |
3551 | } | |
8901d193 | 3552 | |
9c80ecd6 SM |
3553 | return false; |
3554 | }); | |
8901d193 YQ |
3555 | } |
3556 | ||
3b9a79ef | 3557 | if (remove_single_step_breakpoints_p) |
8901d193 | 3558 | { |
3b9a79ef | 3559 | /* If we remove single-step breakpoints from memory, stop all lwps, |
8901d193 YQ |
3560 | so that other threads won't hit the breakpoint in the staled |
3561 | memory. */ | |
3562 | stop_all_lwps (0, event_child); | |
3563 | ||
3564 | if (non_stop) | |
3565 | { | |
3b9a79ef YQ |
3566 | gdb_assert (has_single_step_breakpoints (current_thread)); |
3567 | delete_single_step_breakpoints (current_thread); | |
8901d193 YQ |
3568 | } |
3569 | else | |
3570 | { | |
9c80ecd6 SM |
3571 | for_each_thread ([] (thread_info *thread){ |
3572 | if (has_single_step_breakpoints (thread)) | |
3573 | delete_single_step_breakpoints (thread); | |
3574 | }); | |
8901d193 YQ |
3575 | } |
3576 | ||
3577 | unstop_all_lwps (0, event_child); | |
3578 | } | |
3579 | } | |
3580 | ||
582511be | 3581 | if (!stabilizing_threads) |
6bf5e0ba PA |
3582 | { |
3583 | /* In all-stop, stop all threads. */ | |
582511be PA |
3584 | if (!non_stop) |
3585 | stop_all_lwps (0, NULL); | |
6bf5e0ba | 3586 | |
c03e6ccc | 3587 | if (step_over_finished) |
582511be PA |
3588 | { |
3589 | if (!non_stop) | |
3590 | { | |
3591 | /* If we were doing a step-over, all other threads but | |
3592 | the stepping one had been paused in start_step_over, | |
3593 | with their suspend counts incremented. We don't want | |
3594 | to do a full unstop/unpause, because we're in | |
3595 | all-stop mode (so we want threads stopped), but we | |
3596 | still need to unsuspend the other threads, to | |
3597 | decrement their `suspended' count back. */ | |
3598 | unsuspend_all_lwps (event_child); | |
3599 | } | |
3600 | else | |
3601 | { | |
3602 | /* If we just finished a step-over, then all threads had | |
3603 | been momentarily paused. In all-stop, that's fine, | |
3604 | we want threads stopped by now anyway. In non-stop, | |
3605 | we need to re-resume threads that GDB wanted to be | |
3606 | running. */ | |
3607 | unstop_all_lwps (1, event_child); | |
3608 | } | |
3609 | } | |
c03e6ccc | 3610 | |
3aa5cfa0 AT |
3611 | /* If we're not waiting for a specific LWP, choose an event LWP |
3612 | from among those that have had events. Giving equal priority | |
3613 | to all LWPs that have had events helps prevent | |
3614 | starvation. */ | |
d7e15655 | 3615 | if (ptid == minus_one_ptid) |
3aa5cfa0 AT |
3616 | { |
3617 | event_child->status_pending_p = 1; | |
3618 | event_child->status_pending = w; | |
3619 | ||
3620 | select_event_lwp (&event_child); | |
3621 | ||
3622 | /* current_thread and event_child must stay in sync. */ | |
3623 | current_thread = get_lwp_thread (event_child); | |
3624 | ||
3625 | event_child->status_pending_p = 0; | |
3626 | w = event_child->status_pending; | |
3627 | } | |
3628 | ||
3629 | ||
fa593d66 | 3630 | /* Stabilize threads (move out of jump pads). */ |
582511be | 3631 | if (!non_stop) |
5c9eb2f2 | 3632 | target_stabilize_threads (); |
6bf5e0ba PA |
3633 | } |
3634 | else | |
3635 | { | |
3636 | /* If we just finished a step-over, then all threads had been | |
3637 | momentarily paused. In all-stop, that's fine, we want | |
3638 | threads stopped by now anyway. In non-stop, we need to | |
3639 | re-resume threads that GDB wanted to be running. */ | |
3640 | if (step_over_finished) | |
7984d532 | 3641 | unstop_all_lwps (1, event_child); |
6bf5e0ba PA |
3642 | } |
3643 | ||
00db26fa | 3644 | if (event_child->waitstatus.kind != TARGET_WAITKIND_IGNORE) |
de0d863e | 3645 | { |
00db26fa PA |
3646 | /* If the reported event is an exit, fork, vfork or exec, let |
3647 | GDB know. */ | |
5a04c4cf PA |
3648 | |
3649 | /* Break the unreported fork relationship chain. */ | |
3650 | if (event_child->waitstatus.kind == TARGET_WAITKIND_FORKED | |
3651 | || event_child->waitstatus.kind == TARGET_WAITKIND_VFORKED) | |
3652 | { | |
3653 | event_child->fork_relative->fork_relative = NULL; | |
3654 | event_child->fork_relative = NULL; | |
3655 | } | |
3656 | ||
00db26fa | 3657 | *ourstatus = event_child->waitstatus; |
de0d863e DB |
3658 | /* Clear the event lwp's waitstatus since we handled it already. */ |
3659 | event_child->waitstatus.kind = TARGET_WAITKIND_IGNORE; | |
3660 | } | |
3661 | else | |
3662 | ourstatus->kind = TARGET_WAITKIND_STOPPED; | |
5b1c542e | 3663 | |
582511be | 3664 | /* Now that we've selected our final event LWP, un-adjust its PC if |
3e572f71 PA |
3665 | it was a software breakpoint, and the client doesn't know we can |
3666 | adjust the breakpoint ourselves. */ | |
3667 | if (event_child->stop_reason == TARGET_STOPPED_BY_SW_BREAKPOINT | |
c12a5089 | 3668 | && !cs.swbreak_feature) |
582511be | 3669 | { |
d4807ea2 | 3670 | int decr_pc = low_decr_pc_after_break (); |
582511be PA |
3671 | |
3672 | if (decr_pc != 0) | |
3673 | { | |
3674 | struct regcache *regcache | |
3675 | = get_thread_regcache (current_thread, 1); | |
bf9ae9d8 | 3676 | low_set_pc (regcache, event_child->stop_pc + decr_pc); |
582511be PA |
3677 | } |
3678 | } | |
3679 | ||
82075af2 JS |
3680 | if (WSTOPSIG (w) == SYSCALL_SIGTRAP) |
3681 | { | |
82075af2 | 3682 | get_syscall_trapinfo (event_child, |
4cc32bec | 3683 | &ourstatus->value.syscall_number); |
82075af2 JS |
3684 | ourstatus->kind = event_child->syscall_state; |
3685 | } | |
3686 | else if (current_thread->last_resume_kind == resume_stop | |
3687 | && WSTOPSIG (w) == SIGSTOP) | |
bd99dc85 PA |
3688 | { |
3689 | /* A thread that has been requested to stop by GDB with vCont;t, | |
3690 | and it stopped cleanly, so report as SIG0. The use of | |
3691 | SIGSTOP is an implementation detail. */ | |
a493e3e2 | 3692 | ourstatus->value.sig = GDB_SIGNAL_0; |
bd99dc85 | 3693 | } |
0bfdf32f | 3694 | else if (current_thread->last_resume_kind == resume_stop |
8336d594 | 3695 | && WSTOPSIG (w) != SIGSTOP) |
bd99dc85 PA |
3696 | { |
3697 | /* A thread that has been requested to stop by GDB with vCont;t, | |
d50171e4 | 3698 | but, it stopped for other reasons. */ |
2ea28649 | 3699 | ourstatus->value.sig = gdb_signal_from_host (WSTOPSIG (w)); |
bd99dc85 | 3700 | } |
de0d863e | 3701 | else if (ourstatus->kind == TARGET_WAITKIND_STOPPED) |
bd99dc85 | 3702 | { |
2ea28649 | 3703 | ourstatus->value.sig = gdb_signal_from_host (WSTOPSIG (w)); |
bd99dc85 PA |
3704 | } |
3705 | ||
d7e15655 | 3706 | gdb_assert (step_over_bkpt == null_ptid); |
d50171e4 | 3707 | |
bd99dc85 | 3708 | if (debug_threads) |
87ce2a04 | 3709 | { |
d16f3f6c | 3710 | debug_printf ("wait_1 ret = %s, %d, %d\n", |
0bfdf32f | 3711 | target_pid_to_str (ptid_of (current_thread)), |
87ce2a04 DE |
3712 | ourstatus->kind, ourstatus->value.sig); |
3713 | debug_exit (); | |
3714 | } | |
bd99dc85 | 3715 | |
65706a29 PA |
3716 | if (ourstatus->kind == TARGET_WAITKIND_EXITED) |
3717 | return filter_exit_event (event_child, ourstatus); | |
3718 | ||
0bfdf32f | 3719 | return ptid_of (current_thread); |
bd99dc85 PA |
3720 | } |
3721 | ||
3722 | /* Get rid of any pending event in the pipe. */ | |
3723 | static void | |
3724 | async_file_flush (void) | |
3725 | { | |
3726 | int ret; | |
3727 | char buf; | |
3728 | ||
3729 | do | |
3730 | ret = read (linux_event_pipe[0], &buf, 1); | |
3731 | while (ret >= 0 || (ret == -1 && errno == EINTR)); | |
3732 | } | |
3733 | ||
3734 | /* Put something in the pipe, so the event loop wakes up. */ | |
3735 | static void | |
3736 | async_file_mark (void) | |
3737 | { | |
3738 | int ret; | |
3739 | ||
3740 | async_file_flush (); | |
3741 | ||
3742 | do | |
3743 | ret = write (linux_event_pipe[1], "+", 1); | |
3744 | while (ret == 0 || (ret == -1 && errno == EINTR)); | |
3745 | ||
3746 | /* Ignore EAGAIN. If the pipe is full, the event loop will already | |
3747 | be awakened anyway. */ | |
3748 | } | |
3749 | ||
6532e7e3 TBA |
3750 | ptid_t |
3751 | linux_process_target::wait (ptid_t ptid, | |
3752 | target_waitstatus *ourstatus, | |
3753 | int target_options) | |
bd99dc85 | 3754 | { |
95954743 | 3755 | ptid_t event_ptid; |
bd99dc85 | 3756 | |
bd99dc85 PA |
3757 | /* Flush the async file first. */ |
3758 | if (target_is_async_p ()) | |
3759 | async_file_flush (); | |
3760 | ||
582511be PA |
3761 | do |
3762 | { | |
d16f3f6c | 3763 | event_ptid = wait_1 (ptid, ourstatus, target_options); |
582511be PA |
3764 | } |
3765 | while ((target_options & TARGET_WNOHANG) == 0 | |
d7e15655 | 3766 | && event_ptid == null_ptid |
582511be | 3767 | && ourstatus->kind == TARGET_WAITKIND_IGNORE); |
bd99dc85 PA |
3768 | |
3769 | /* If at least one stop was reported, there may be more. A single | |
3770 | SIGCHLD can signal more than one child stop. */ | |
3771 | if (target_is_async_p () | |
3772 | && (target_options & TARGET_WNOHANG) != 0 | |
d7e15655 | 3773 | && event_ptid != null_ptid) |
bd99dc85 PA |
3774 | async_file_mark (); |
3775 | ||
3776 | return event_ptid; | |
da6d8c04 DJ |
3777 | } |
3778 | ||
c5f62d5f | 3779 | /* Send a signal to an LWP. */ |
fd500816 DJ |
3780 | |
3781 | static int | |
a1928bad | 3782 | kill_lwp (unsigned long lwpid, int signo) |
fd500816 | 3783 | { |
4a6ed09b | 3784 | int ret; |
fd500816 | 3785 | |
4a6ed09b PA |
3786 | errno = 0; |
3787 | ret = syscall (__NR_tkill, lwpid, signo); | |
3788 | if (errno == ENOSYS) | |
3789 | { | |
3790 | /* If tkill fails, then we are not using nptl threads, a | |
3791 | configuration we no longer support. */ | |
3792 | perror_with_name (("tkill")); | |
3793 | } | |
3794 | return ret; | |
fd500816 DJ |
3795 | } |
3796 | ||
964e4306 PA |
3797 | void |
3798 | linux_stop_lwp (struct lwp_info *lwp) | |
3799 | { | |
3800 | send_sigstop (lwp); | |
3801 | } | |
3802 | ||
0d62e5e8 | 3803 | static void |
02fc4de7 | 3804 | send_sigstop (struct lwp_info *lwp) |
0d62e5e8 | 3805 | { |
bd99dc85 | 3806 | int pid; |
0d62e5e8 | 3807 | |
d86d4aaf | 3808 | pid = lwpid_of (get_lwp_thread (lwp)); |
bd99dc85 | 3809 | |
0d62e5e8 DJ |
3810 | /* If we already have a pending stop signal for this process, don't |
3811 | send another. */ | |
54a0b537 | 3812 | if (lwp->stop_expected) |
0d62e5e8 | 3813 | { |
ae13219e | 3814 | if (debug_threads) |
87ce2a04 | 3815 | debug_printf ("Have pending sigstop for lwp %d\n", pid); |
ae13219e | 3816 | |
0d62e5e8 DJ |
3817 | return; |
3818 | } | |
3819 | ||
3820 | if (debug_threads) | |
87ce2a04 | 3821 | debug_printf ("Sending sigstop to lwp %d\n", pid); |
0d62e5e8 | 3822 | |
d50171e4 | 3823 | lwp->stop_expected = 1; |
bd99dc85 | 3824 | kill_lwp (pid, SIGSTOP); |
0d62e5e8 DJ |
3825 | } |
3826 | ||
df3e4dbe SM |
3827 | static void |
3828 | send_sigstop (thread_info *thread, lwp_info *except) | |
02fc4de7 | 3829 | { |
d86d4aaf | 3830 | struct lwp_info *lwp = get_thread_lwp (thread); |
02fc4de7 | 3831 | |
7984d532 PA |
3832 | /* Ignore EXCEPT. */ |
3833 | if (lwp == except) | |
df3e4dbe | 3834 | return; |
7984d532 | 3835 | |
02fc4de7 | 3836 | if (lwp->stopped) |
df3e4dbe | 3837 | return; |
02fc4de7 PA |
3838 | |
3839 | send_sigstop (lwp); | |
7984d532 PA |
3840 | } |
3841 | ||
3842 | /* Increment the suspend count of an LWP, and stop it, if not stopped | |
3843 | yet. */ | |
df3e4dbe SM |
3844 | static void |
3845 | suspend_and_send_sigstop (thread_info *thread, lwp_info *except) | |
7984d532 | 3846 | { |
d86d4aaf | 3847 | struct lwp_info *lwp = get_thread_lwp (thread); |
7984d532 PA |
3848 | |
3849 | /* Ignore EXCEPT. */ | |
3850 | if (lwp == except) | |
df3e4dbe | 3851 | return; |
7984d532 | 3852 | |
863d01bd | 3853 | lwp_suspended_inc (lwp); |
7984d532 | 3854 | |
df3e4dbe | 3855 | send_sigstop (thread, except); |
02fc4de7 PA |
3856 | } |
3857 | ||
95954743 PA |
3858 | static void |
3859 | mark_lwp_dead (struct lwp_info *lwp, int wstat) | |
3860 | { | |
95954743 PA |
3861 | /* Store the exit status for later. */ |
3862 | lwp->status_pending_p = 1; | |
3863 | lwp->status_pending = wstat; | |
3864 | ||
00db26fa PA |
3865 | /* Store in waitstatus as well, as there's nothing else to process |
3866 | for this event. */ | |
3867 | if (WIFEXITED (wstat)) | |
3868 | { | |
3869 | lwp->waitstatus.kind = TARGET_WAITKIND_EXITED; | |
3870 | lwp->waitstatus.value.integer = WEXITSTATUS (wstat); | |
3871 | } | |
3872 | else if (WIFSIGNALED (wstat)) | |
3873 | { | |
3874 | lwp->waitstatus.kind = TARGET_WAITKIND_SIGNALLED; | |
3875 | lwp->waitstatus.value.sig = gdb_signal_from_host (WTERMSIG (wstat)); | |
3876 | } | |
3877 | ||
95954743 PA |
3878 | /* Prevent trying to stop it. */ |
3879 | lwp->stopped = 1; | |
3880 | ||
3881 | /* No further stops are expected from a dead lwp. */ | |
3882 | lwp->stop_expected = 0; | |
3883 | } | |
3884 | ||
00db26fa PA |
3885 | /* Return true if LWP has exited already, and has a pending exit event |
3886 | to report to GDB. */ | |
3887 | ||
3888 | static int | |
3889 | lwp_is_marked_dead (struct lwp_info *lwp) | |
3890 | { | |
3891 | return (lwp->status_pending_p | |
3892 | && (WIFEXITED (lwp->status_pending) | |
3893 | || WIFSIGNALED (lwp->status_pending))); | |
3894 | } | |
3895 | ||
d16f3f6c TBA |
3896 | void |
3897 | linux_process_target::wait_for_sigstop () | |
0d62e5e8 | 3898 | { |
0bfdf32f | 3899 | struct thread_info *saved_thread; |
95954743 | 3900 | ptid_t saved_tid; |
fa96cb38 PA |
3901 | int wstat; |
3902 | int ret; | |
0d62e5e8 | 3903 | |
0bfdf32f GB |
3904 | saved_thread = current_thread; |
3905 | if (saved_thread != NULL) | |
9c80ecd6 | 3906 | saved_tid = saved_thread->id; |
bd99dc85 | 3907 | else |
95954743 | 3908 | saved_tid = null_ptid; /* avoid bogus unused warning */ |
bd99dc85 | 3909 | |
d50171e4 | 3910 | if (debug_threads) |
fa96cb38 | 3911 | debug_printf ("wait_for_sigstop: pulling events\n"); |
d50171e4 | 3912 | |
fa96cb38 PA |
3913 | /* Passing NULL_PTID as filter indicates we want all events to be |
3914 | left pending. Eventually this returns when there are no | |
3915 | unwaited-for children left. */ | |
d16f3f6c | 3916 | ret = wait_for_event_filtered (minus_one_ptid, null_ptid, &wstat, __WALL); |
fa96cb38 | 3917 | gdb_assert (ret == -1); |
0d62e5e8 | 3918 | |
13d3d99b | 3919 | if (saved_thread == NULL || mythread_alive (saved_tid)) |
0bfdf32f | 3920 | current_thread = saved_thread; |
0d62e5e8 DJ |
3921 | else |
3922 | { | |
3923 | if (debug_threads) | |
87ce2a04 | 3924 | debug_printf ("Previously current thread died.\n"); |
0d62e5e8 | 3925 | |
f0db101d PA |
3926 | /* We can't change the current inferior behind GDB's back, |
3927 | otherwise, a subsequent command may apply to the wrong | |
3928 | process. */ | |
3929 | current_thread = NULL; | |
0d62e5e8 DJ |
3930 | } |
3931 | } | |
3932 | ||
13e567af TBA |
3933 | bool |
3934 | linux_process_target::stuck_in_jump_pad (thread_info *thread) | |
fa593d66 | 3935 | { |
d86d4aaf | 3936 | struct lwp_info *lwp = get_thread_lwp (thread); |
fa593d66 | 3937 | |
863d01bd PA |
3938 | if (lwp->suspended != 0) |
3939 | { | |
3940 | internal_error (__FILE__, __LINE__, | |
3941 | "LWP %ld is suspended, suspended=%d\n", | |
3942 | lwpid_of (thread), lwp->suspended); | |
3943 | } | |
fa593d66 PA |
3944 | gdb_assert (lwp->stopped); |
3945 | ||
3946 | /* Allow debugging the jump pad, gdb_collect, etc.. */ | |
3947 | return (supports_fast_tracepoints () | |
58b4daa5 | 3948 | && agent_loaded_p () |
fa593d66 | 3949 | && (gdb_breakpoint_here (lwp->stop_pc) |
15c66dd6 | 3950 | || lwp->stop_reason == TARGET_STOPPED_BY_WATCHPOINT |
fa593d66 | 3951 | || thread->last_resume_kind == resume_step) |
229d26fc SM |
3952 | && (linux_fast_tracepoint_collecting (lwp, NULL) |
3953 | != fast_tpoint_collect_result::not_collecting)); | |
fa593d66 PA |
3954 | } |
3955 | ||
d16f3f6c TBA |
3956 | void |
3957 | linux_process_target::move_out_of_jump_pad (thread_info *thread) | |
fa593d66 | 3958 | { |
f0ce0d3a | 3959 | struct thread_info *saved_thread; |
d86d4aaf | 3960 | struct lwp_info *lwp = get_thread_lwp (thread); |
fa593d66 PA |
3961 | int *wstat; |
3962 | ||
863d01bd PA |
3963 | if (lwp->suspended != 0) |
3964 | { | |
3965 | internal_error (__FILE__, __LINE__, | |
3966 | "LWP %ld is suspended, suspended=%d\n", | |
3967 | lwpid_of (thread), lwp->suspended); | |
3968 | } | |
fa593d66 PA |
3969 | gdb_assert (lwp->stopped); |
3970 | ||
f0ce0d3a PA |
3971 | /* For gdb_breakpoint_here. */ |
3972 | saved_thread = current_thread; | |
3973 | current_thread = thread; | |
3974 | ||
fa593d66 PA |
3975 | wstat = lwp->status_pending_p ? &lwp->status_pending : NULL; |
3976 | ||
3977 | /* Allow debugging the jump pad, gdb_collect, etc. */ | |
3978 | if (!gdb_breakpoint_here (lwp->stop_pc) | |
15c66dd6 | 3979 | && lwp->stop_reason != TARGET_STOPPED_BY_WATCHPOINT |
fa593d66 PA |
3980 | && thread->last_resume_kind != resume_step |
3981 | && maybe_move_out_of_jump_pad (lwp, wstat)) | |
3982 | { | |
3983 | if (debug_threads) | |
87ce2a04 | 3984 | debug_printf ("LWP %ld needs stabilizing (in jump pad)\n", |
d86d4aaf | 3985 | lwpid_of (thread)); |
fa593d66 PA |
3986 | |
3987 | if (wstat) | |
3988 | { | |
3989 | lwp->status_pending_p = 0; | |
3990 | enqueue_one_deferred_signal (lwp, wstat); | |
3991 | ||
3992 | if (debug_threads) | |
87ce2a04 DE |
3993 | debug_printf ("Signal %d for LWP %ld deferred " |
3994 | "(in jump pad)\n", | |
d86d4aaf | 3995 | WSTOPSIG (*wstat), lwpid_of (thread)); |
fa593d66 PA |
3996 | } |
3997 | ||
df95181f | 3998 | resume_one_lwp (lwp, 0, 0, NULL); |
fa593d66 PA |
3999 | } |
4000 | else | |
863d01bd | 4001 | lwp_suspended_inc (lwp); |
f0ce0d3a PA |
4002 | |
4003 | current_thread = saved_thread; | |
fa593d66 PA |
4004 | } |
4005 | ||
5a6b0a41 SM |
4006 | static bool |
4007 | lwp_running (thread_info *thread) | |
fa593d66 | 4008 | { |
d86d4aaf | 4009 | struct lwp_info *lwp = get_thread_lwp (thread); |
fa593d66 | 4010 | |
00db26fa | 4011 | if (lwp_is_marked_dead (lwp)) |
5a6b0a41 SM |
4012 | return false; |
4013 | ||
4014 | return !lwp->stopped; | |
fa593d66 PA |
4015 | } |
4016 | ||
d16f3f6c TBA |
4017 | void |
4018 | linux_process_target::stop_all_lwps (int suspend, lwp_info *except) | |
0d62e5e8 | 4019 | { |
bde24c0a PA |
4020 | /* Should not be called recursively. */ |
4021 | gdb_assert (stopping_threads == NOT_STOPPING_THREADS); | |
4022 | ||
87ce2a04 DE |
4023 | if (debug_threads) |
4024 | { | |
4025 | debug_enter (); | |
4026 | debug_printf ("stop_all_lwps (%s, except=%s)\n", | |
4027 | suspend ? "stop-and-suspend" : "stop", | |
4028 | except != NULL | |
d86d4aaf | 4029 | ? target_pid_to_str (ptid_of (get_lwp_thread (except))) |
87ce2a04 DE |
4030 | : "none"); |
4031 | } | |
4032 | ||
bde24c0a PA |
4033 | stopping_threads = (suspend |
4034 | ? STOPPING_AND_SUSPENDING_THREADS | |
4035 | : STOPPING_THREADS); | |
7984d532 PA |
4036 | |
4037 | if (suspend) | |
df3e4dbe SM |
4038 | for_each_thread ([&] (thread_info *thread) |
4039 | { | |
4040 | suspend_and_send_sigstop (thread, except); | |
4041 | }); | |
7984d532 | 4042 | else |
df3e4dbe SM |
4043 | for_each_thread ([&] (thread_info *thread) |
4044 | { | |
4045 | send_sigstop (thread, except); | |
4046 | }); | |
4047 | ||
fa96cb38 | 4048 | wait_for_sigstop (); |
bde24c0a | 4049 | stopping_threads = NOT_STOPPING_THREADS; |
87ce2a04 DE |
4050 | |
4051 | if (debug_threads) | |
4052 | { | |
4053 | debug_printf ("stop_all_lwps done, setting stopping_threads " | |
4054 | "back to !stopping\n"); | |
4055 | debug_exit (); | |
4056 | } | |
0d62e5e8 DJ |
4057 | } |
4058 | ||
863d01bd PA |
4059 | /* Enqueue one signal in the chain of signals which need to be |
4060 | delivered to this process on next resume. */ | |
4061 | ||
4062 | static void | |
4063 | enqueue_pending_signal (struct lwp_info *lwp, int signal, siginfo_t *info) | |
4064 | { | |
8d749320 | 4065 | struct pending_signals *p_sig = XNEW (struct pending_signals); |
863d01bd | 4066 | |
863d01bd PA |
4067 | p_sig->prev = lwp->pending_signals; |
4068 | p_sig->signal = signal; | |
4069 | if (info == NULL) | |
4070 | memset (&p_sig->info, 0, sizeof (siginfo_t)); | |
4071 | else | |
4072 | memcpy (&p_sig->info, info, sizeof (siginfo_t)); | |
4073 | lwp->pending_signals = p_sig; | |
4074 | } | |
4075 | ||
df95181f TBA |
4076 | void |
4077 | linux_process_target::install_software_single_step_breakpoints (lwp_info *lwp) | |
fa5308bd | 4078 | { |
984a2c04 YQ |
4079 | struct thread_info *thread = get_lwp_thread (lwp); |
4080 | struct regcache *regcache = get_thread_regcache (thread, 1); | |
8ce47547 TT |
4081 | |
4082 | scoped_restore save_current_thread = make_scoped_restore (¤t_thread); | |
984a2c04 | 4083 | |
984a2c04 | 4084 | current_thread = thread; |
7582c77c | 4085 | std::vector<CORE_ADDR> next_pcs = low_get_next_pcs (regcache); |
fa5308bd | 4086 | |
a0ff9e1a | 4087 | for (CORE_ADDR pc : next_pcs) |
3b9a79ef | 4088 | set_single_step_breakpoint (pc, current_ptid); |
fa5308bd AT |
4089 | } |
4090 | ||
df95181f TBA |
4091 | int |
4092 | linux_process_target::single_step (lwp_info* lwp) | |
7fe5e27e AT |
4093 | { |
4094 | int step = 0; | |
4095 | ||
b31cdfa6 | 4096 | if (supports_hardware_single_step ()) |
7fe5e27e AT |
4097 | { |
4098 | step = 1; | |
4099 | } | |
7582c77c | 4100 | else if (supports_software_single_step ()) |
7fe5e27e AT |
4101 | { |
4102 | install_software_single_step_breakpoints (lwp); | |
4103 | step = 0; | |
4104 | } | |
4105 | else | |
4106 | { | |
4107 | if (debug_threads) | |
4108 | debug_printf ("stepping is not implemented on this target"); | |
4109 | } | |
4110 | ||
4111 | return step; | |
4112 | } | |
4113 | ||
35ac8b3e | 4114 | /* The signal can be delivered to the inferior if we are not trying to |
5b061e98 YQ |
4115 | finish a fast tracepoint collect. Since signal can be delivered in |
4116 | the step-over, the program may go to signal handler and trap again | |
4117 | after return from the signal handler. We can live with the spurious | |
4118 | double traps. */ | |
35ac8b3e YQ |
4119 | |
4120 | static int | |
4121 | lwp_signal_can_be_delivered (struct lwp_info *lwp) | |
4122 | { | |
229d26fc SM |
4123 | return (lwp->collecting_fast_tracepoint |
4124 | == fast_tpoint_collect_result::not_collecting); | |
35ac8b3e YQ |
4125 | } |
4126 | ||
df95181f TBA |
4127 | void |
4128 | linux_process_target::resume_one_lwp_throw (lwp_info *lwp, int step, | |
4129 | int signal, siginfo_t *info) | |
da6d8c04 | 4130 | { |
d86d4aaf | 4131 | struct thread_info *thread = get_lwp_thread (lwp); |
0bfdf32f | 4132 | struct thread_info *saved_thread; |
82075af2 | 4133 | int ptrace_request; |
c06cbd92 YQ |
4134 | struct process_info *proc = get_thread_process (thread); |
4135 | ||
4136 | /* Note that target description may not be initialised | |
4137 | (proc->tdesc == NULL) at this point because the program hasn't | |
4138 | stopped at the first instruction yet. It means GDBserver skips | |
4139 | the extra traps from the wrapper program (see option --wrapper). | |
4140 | Code in this function that requires register access should be | |
4141 | guarded by proc->tdesc == NULL or something else. */ | |
0d62e5e8 | 4142 | |
54a0b537 | 4143 | if (lwp->stopped == 0) |
0d62e5e8 DJ |
4144 | return; |
4145 | ||
65706a29 PA |
4146 | gdb_assert (lwp->waitstatus.kind == TARGET_WAITKIND_IGNORE); |
4147 | ||
229d26fc SM |
4148 | fast_tpoint_collect_result fast_tp_collecting |
4149 | = lwp->collecting_fast_tracepoint; | |
fa593d66 | 4150 | |
229d26fc SM |
4151 | gdb_assert (!stabilizing_threads |
4152 | || (fast_tp_collecting | |
4153 | != fast_tpoint_collect_result::not_collecting)); | |
fa593d66 | 4154 | |
219f2f23 PA |
4155 | /* Cancel actions that rely on GDB not changing the PC (e.g., the |
4156 | user used the "jump" command, or "set $pc = foo"). */ | |
c06cbd92 | 4157 | if (thread->while_stepping != NULL && lwp->stop_pc != get_pc (lwp)) |
219f2f23 PA |
4158 | { |
4159 | /* Collecting 'while-stepping' actions doesn't make sense | |
4160 | anymore. */ | |
d86d4aaf | 4161 | release_while_stepping_state_list (thread); |
219f2f23 PA |
4162 | } |
4163 | ||
0d62e5e8 | 4164 | /* If we have pending signals or status, and a new signal, enqueue the |
35ac8b3e YQ |
4165 | signal. Also enqueue the signal if it can't be delivered to the |
4166 | inferior right now. */ | |
0d62e5e8 | 4167 | if (signal != 0 |
fa593d66 PA |
4168 | && (lwp->status_pending_p |
4169 | || lwp->pending_signals != NULL | |
35ac8b3e | 4170 | || !lwp_signal_can_be_delivered (lwp))) |
94610ec4 YQ |
4171 | { |
4172 | enqueue_pending_signal (lwp, signal, info); | |
4173 | ||
4174 | /* Postpone any pending signal. It was enqueued above. */ | |
4175 | signal = 0; | |
4176 | } | |
0d62e5e8 | 4177 | |
d50171e4 PA |
4178 | if (lwp->status_pending_p) |
4179 | { | |
4180 | if (debug_threads) | |
94610ec4 | 4181 | debug_printf ("Not resuming lwp %ld (%s, stop %s);" |
87ce2a04 | 4182 | " has pending status\n", |
94610ec4 | 4183 | lwpid_of (thread), step ? "step" : "continue", |
87ce2a04 | 4184 | lwp->stop_expected ? "expected" : "not expected"); |
d50171e4 PA |
4185 | return; |
4186 | } | |
0d62e5e8 | 4187 | |
0bfdf32f GB |
4188 | saved_thread = current_thread; |
4189 | current_thread = thread; | |
0d62e5e8 | 4190 | |
0d62e5e8 DJ |
4191 | /* This bit needs some thinking about. If we get a signal that |
4192 | we must report while a single-step reinsert is still pending, | |
4193 | we often end up resuming the thread. It might be better to | |
4194 | (ew) allow a stack of pending events; then we could be sure that | |
4195 | the reinsert happened right away and not lose any signals. | |
4196 | ||
4197 | Making this stack would also shrink the window in which breakpoints are | |
54a0b537 | 4198 | uninserted (see comment in linux_wait_for_lwp) but not enough for |
0d62e5e8 DJ |
4199 | complete correctness, so it won't solve that problem. It may be |
4200 | worthwhile just to solve this one, however. */ | |
54a0b537 | 4201 | if (lwp->bp_reinsert != 0) |
0d62e5e8 DJ |
4202 | { |
4203 | if (debug_threads) | |
87ce2a04 DE |
4204 | debug_printf (" pending reinsert at 0x%s\n", |
4205 | paddress (lwp->bp_reinsert)); | |
d50171e4 | 4206 | |
b31cdfa6 | 4207 | if (supports_hardware_single_step ()) |
d50171e4 | 4208 | { |
229d26fc | 4209 | if (fast_tp_collecting == fast_tpoint_collect_result::not_collecting) |
fa593d66 PA |
4210 | { |
4211 | if (step == 0) | |
9986ba08 | 4212 | warning ("BAD - reinserting but not stepping."); |
fa593d66 | 4213 | if (lwp->suspended) |
9986ba08 PA |
4214 | warning ("BAD - reinserting and suspended(%d).", |
4215 | lwp->suspended); | |
fa593d66 | 4216 | } |
d50171e4 | 4217 | } |
f79b145d YQ |
4218 | |
4219 | step = maybe_hw_step (thread); | |
0d62e5e8 DJ |
4220 | } |
4221 | ||
229d26fc | 4222 | if (fast_tp_collecting == fast_tpoint_collect_result::before_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 | " (exit-jump-pad-bkpt)\n", | |
d86d4aaf | 4227 | lwpid_of (thread)); |
fa593d66 | 4228 | } |
229d26fc | 4229 | else if (fast_tp_collecting == fast_tpoint_collect_result::at_insn) |
fa593d66 PA |
4230 | { |
4231 | if (debug_threads) | |
87ce2a04 DE |
4232 | debug_printf ("lwp %ld wants to get out of fast tracepoint jump pad" |
4233 | " single-stepping\n", | |
d86d4aaf | 4234 | lwpid_of (thread)); |
fa593d66 | 4235 | |
b31cdfa6 | 4236 | if (supports_hardware_single_step ()) |
fa593d66 PA |
4237 | step = 1; |
4238 | else | |
38e08fca GB |
4239 | { |
4240 | internal_error (__FILE__, __LINE__, | |
4241 | "moving out of jump pad single-stepping" | |
4242 | " not implemented on this target"); | |
4243 | } | |
fa593d66 PA |
4244 | } |
4245 | ||
219f2f23 PA |
4246 | /* If we have while-stepping actions in this thread set it stepping. |
4247 | If we have a signal to deliver, it may or may not be set to | |
4248 | SIG_IGN, we don't know. Assume so, and allow collecting | |
4249 | while-stepping into a signal handler. A possible smart thing to | |
4250 | do would be to set an internal breakpoint at the signal return | |
4251 | address, continue, and carry on catching this while-stepping | |
4252 | action only when that breakpoint is hit. A future | |
4253 | enhancement. */ | |
7fe5e27e | 4254 | if (thread->while_stepping != NULL) |
219f2f23 PA |
4255 | { |
4256 | if (debug_threads) | |
87ce2a04 | 4257 | debug_printf ("lwp %ld has a while-stepping action -> forcing step.\n", |
d86d4aaf | 4258 | lwpid_of (thread)); |
7fe5e27e AT |
4259 | |
4260 | step = single_step (lwp); | |
219f2f23 PA |
4261 | } |
4262 | ||
bf9ae9d8 | 4263 | if (proc->tdesc != NULL && low_supports_breakpoints ()) |
0d62e5e8 | 4264 | { |
0bfdf32f | 4265 | struct regcache *regcache = get_thread_regcache (current_thread, 1); |
582511be | 4266 | |
bf9ae9d8 | 4267 | lwp->stop_pc = low_get_pc (regcache); |
582511be PA |
4268 | |
4269 | if (debug_threads) | |
4270 | { | |
4271 | debug_printf (" %s from pc 0x%lx\n", step ? "step" : "continue", | |
4272 | (long) lwp->stop_pc); | |
4273 | } | |
0d62e5e8 DJ |
4274 | } |
4275 | ||
35ac8b3e YQ |
4276 | /* If we have pending signals, consume one if it can be delivered to |
4277 | the inferior. */ | |
4278 | if (lwp->pending_signals != NULL && lwp_signal_can_be_delivered (lwp)) | |
0d62e5e8 DJ |
4279 | { |
4280 | struct pending_signals **p_sig; | |
4281 | ||
54a0b537 | 4282 | p_sig = &lwp->pending_signals; |
0d62e5e8 DJ |
4283 | while ((*p_sig)->prev != NULL) |
4284 | p_sig = &(*p_sig)->prev; | |
4285 | ||
4286 | signal = (*p_sig)->signal; | |
32ca6d61 | 4287 | if ((*p_sig)->info.si_signo != 0) |
d86d4aaf | 4288 | ptrace (PTRACE_SETSIGINFO, lwpid_of (thread), (PTRACE_TYPE_ARG3) 0, |
56f7af9c | 4289 | &(*p_sig)->info); |
32ca6d61 | 4290 | |
0d62e5e8 DJ |
4291 | free (*p_sig); |
4292 | *p_sig = NULL; | |
4293 | } | |
4294 | ||
94610ec4 YQ |
4295 | if (debug_threads) |
4296 | debug_printf ("Resuming lwp %ld (%s, signal %d, stop %s)\n", | |
4297 | lwpid_of (thread), step ? "step" : "continue", signal, | |
4298 | lwp->stop_expected ? "expected" : "not expected"); | |
4299 | ||
d7599cc0 | 4300 | low_prepare_to_resume (lwp); |
aa5ca48f | 4301 | |
d86d4aaf | 4302 | regcache_invalidate_thread (thread); |
da6d8c04 | 4303 | errno = 0; |
54a0b537 | 4304 | lwp->stepping = step; |
82075af2 JS |
4305 | if (step) |
4306 | ptrace_request = PTRACE_SINGLESTEP; | |
4307 | else if (gdb_catching_syscalls_p (lwp)) | |
4308 | ptrace_request = PTRACE_SYSCALL; | |
4309 | else | |
4310 | ptrace_request = PTRACE_CONT; | |
4311 | ptrace (ptrace_request, | |
4312 | lwpid_of (thread), | |
b8e1b30e | 4313 | (PTRACE_TYPE_ARG3) 0, |
14ce3065 DE |
4314 | /* Coerce to a uintptr_t first to avoid potential gcc warning |
4315 | of coercing an 8 byte integer to a 4 byte pointer. */ | |
b8e1b30e | 4316 | (PTRACE_TYPE_ARG4) (uintptr_t) signal); |
0d62e5e8 | 4317 | |
0bfdf32f | 4318 | current_thread = saved_thread; |
da6d8c04 | 4319 | if (errno) |
23f238d3 PA |
4320 | perror_with_name ("resuming thread"); |
4321 | ||
4322 | /* Successfully resumed. Clear state that no longer makes sense, | |
4323 | and mark the LWP as running. Must not do this before resuming | |
4324 | otherwise if that fails other code will be confused. E.g., we'd | |
4325 | later try to stop the LWP and hang forever waiting for a stop | |
4326 | status. Note that we must not throw after this is cleared, | |
4327 | otherwise handle_zombie_lwp_error would get confused. */ | |
4328 | lwp->stopped = 0; | |
4329 | lwp->stop_reason = TARGET_STOPPED_BY_NO_REASON; | |
4330 | } | |
4331 | ||
d7599cc0 TBA |
4332 | void |
4333 | linux_process_target::low_prepare_to_resume (lwp_info *lwp) | |
4334 | { | |
4335 | /* Nop. */ | |
4336 | } | |
4337 | ||
23f238d3 PA |
4338 | /* Called when we try to resume a stopped LWP and that errors out. If |
4339 | the LWP is no longer in ptrace-stopped state (meaning it's zombie, | |
4340 | or about to become), discard the error, clear any pending status | |
4341 | the LWP may have, and return true (we'll collect the exit status | |
4342 | soon enough). Otherwise, return false. */ | |
4343 | ||
4344 | static int | |
4345 | check_ptrace_stopped_lwp_gone (struct lwp_info *lp) | |
4346 | { | |
4347 | struct thread_info *thread = get_lwp_thread (lp); | |
4348 | ||
4349 | /* If we get an error after resuming the LWP successfully, we'd | |
4350 | confuse !T state for the LWP being gone. */ | |
4351 | gdb_assert (lp->stopped); | |
4352 | ||
4353 | /* We can't just check whether the LWP is in 'Z (Zombie)' state, | |
4354 | because even if ptrace failed with ESRCH, the tracee may be "not | |
4355 | yet fully dead", but already refusing ptrace requests. In that | |
4356 | case the tracee has 'R (Running)' state for a little bit | |
4357 | (observed in Linux 3.18). See also the note on ESRCH in the | |
4358 | ptrace(2) man page. Instead, check whether the LWP has any state | |
4359 | other than ptrace-stopped. */ | |
4360 | ||
4361 | /* Don't assume anything if /proc/PID/status can't be read. */ | |
4362 | if (linux_proc_pid_is_trace_stopped_nowarn (lwpid_of (thread)) == 0) | |
3221518c | 4363 | { |
23f238d3 PA |
4364 | lp->stop_reason = TARGET_STOPPED_BY_NO_REASON; |
4365 | lp->status_pending_p = 0; | |
4366 | return 1; | |
4367 | } | |
4368 | return 0; | |
4369 | } | |
4370 | ||
df95181f TBA |
4371 | void |
4372 | linux_process_target::resume_one_lwp (lwp_info *lwp, int step, int signal, | |
4373 | siginfo_t *info) | |
23f238d3 | 4374 | { |
a70b8144 | 4375 | try |
23f238d3 | 4376 | { |
df95181f | 4377 | resume_one_lwp_throw (lwp, step, signal, info); |
23f238d3 | 4378 | } |
230d2906 | 4379 | catch (const gdb_exception_error &ex) |
23f238d3 PA |
4380 | { |
4381 | if (!check_ptrace_stopped_lwp_gone (lwp)) | |
eedc3f4f | 4382 | throw; |
3221518c | 4383 | } |
da6d8c04 DJ |
4384 | } |
4385 | ||
5fdda392 SM |
4386 | /* This function is called once per thread via for_each_thread. |
4387 | We look up which resume request applies to THREAD and mark it with a | |
4388 | pointer to the appropriate resume request. | |
5544ad89 DJ |
4389 | |
4390 | This algorithm is O(threads * resume elements), but resume elements | |
4391 | is small (and will remain small at least until GDB supports thread | |
4392 | suspension). */ | |
ebcf782c | 4393 | |
5fdda392 SM |
4394 | static void |
4395 | linux_set_resume_request (thread_info *thread, thread_resume *resume, size_t n) | |
0d62e5e8 | 4396 | { |
d86d4aaf | 4397 | struct lwp_info *lwp = get_thread_lwp (thread); |
64386c31 | 4398 | |
5fdda392 | 4399 | for (int ndx = 0; ndx < n; ndx++) |
95954743 | 4400 | { |
5fdda392 | 4401 | ptid_t ptid = resume[ndx].thread; |
d7e15655 | 4402 | if (ptid == minus_one_ptid |
9c80ecd6 | 4403 | || ptid == thread->id |
0c9070b3 YQ |
4404 | /* Handle both 'pPID' and 'pPID.-1' as meaning 'all threads |
4405 | of PID'. */ | |
e99b03dc | 4406 | || (ptid.pid () == pid_of (thread) |
0e998d96 | 4407 | && (ptid.is_pid () |
e38504b3 | 4408 | || ptid.lwp () == -1))) |
95954743 | 4409 | { |
5fdda392 | 4410 | if (resume[ndx].kind == resume_stop |
8336d594 | 4411 | && thread->last_resume_kind == resume_stop) |
d50171e4 PA |
4412 | { |
4413 | if (debug_threads) | |
87ce2a04 DE |
4414 | debug_printf ("already %s LWP %ld at GDB's request\n", |
4415 | (thread->last_status.kind | |
4416 | == TARGET_WAITKIND_STOPPED) | |
4417 | ? "stopped" | |
4418 | : "stopping", | |
d86d4aaf | 4419 | lwpid_of (thread)); |
d50171e4 PA |
4420 | |
4421 | continue; | |
4422 | } | |
4423 | ||
5a04c4cf PA |
4424 | /* Ignore (wildcard) resume requests for already-resumed |
4425 | threads. */ | |
5fdda392 | 4426 | if (resume[ndx].kind != resume_stop |
5a04c4cf PA |
4427 | && thread->last_resume_kind != resume_stop) |
4428 | { | |
4429 | if (debug_threads) | |
4430 | debug_printf ("already %s LWP %ld at GDB's request\n", | |
4431 | (thread->last_resume_kind | |
4432 | == resume_step) | |
4433 | ? "stepping" | |
4434 | : "continuing", | |
4435 | lwpid_of (thread)); | |
4436 | continue; | |
4437 | } | |
4438 | ||
4439 | /* Don't let wildcard resumes resume fork children that GDB | |
4440 | does not yet know are new fork children. */ | |
4441 | if (lwp->fork_relative != NULL) | |
4442 | { | |
5a04c4cf PA |
4443 | struct lwp_info *rel = lwp->fork_relative; |
4444 | ||
4445 | if (rel->status_pending_p | |
4446 | && (rel->waitstatus.kind == TARGET_WAITKIND_FORKED | |
4447 | || rel->waitstatus.kind == TARGET_WAITKIND_VFORKED)) | |
4448 | { | |
4449 | if (debug_threads) | |
4450 | debug_printf ("not resuming LWP %ld: has queued stop reply\n", | |
4451 | lwpid_of (thread)); | |
4452 | continue; | |
4453 | } | |
4454 | } | |
4455 | ||
4456 | /* If the thread has a pending event that has already been | |
4457 | reported to GDBserver core, but GDB has not pulled the | |
4458 | event out of the vStopped queue yet, likewise, ignore the | |
4459 | (wildcard) resume request. */ | |
9c80ecd6 | 4460 | if (in_queued_stop_replies (thread->id)) |
5a04c4cf PA |
4461 | { |
4462 | if (debug_threads) | |
4463 | debug_printf ("not resuming LWP %ld: has queued stop reply\n", | |
4464 | lwpid_of (thread)); | |
4465 | continue; | |
4466 | } | |
4467 | ||
5fdda392 | 4468 | lwp->resume = &resume[ndx]; |
8336d594 | 4469 | thread->last_resume_kind = lwp->resume->kind; |
fa593d66 | 4470 | |
c2d6af84 PA |
4471 | lwp->step_range_start = lwp->resume->step_range_start; |
4472 | lwp->step_range_end = lwp->resume->step_range_end; | |
4473 | ||
fa593d66 PA |
4474 | /* If we had a deferred signal to report, dequeue one now. |
4475 | This can happen if LWP gets more than one signal while | |
4476 | trying to get out of a jump pad. */ | |
4477 | if (lwp->stopped | |
4478 | && !lwp->status_pending_p | |
4479 | && dequeue_one_deferred_signal (lwp, &lwp->status_pending)) | |
4480 | { | |
4481 | lwp->status_pending_p = 1; | |
4482 | ||
4483 | if (debug_threads) | |
87ce2a04 DE |
4484 | debug_printf ("Dequeueing deferred signal %d for LWP %ld, " |
4485 | "leaving status pending.\n", | |
d86d4aaf DE |
4486 | WSTOPSIG (lwp->status_pending), |
4487 | lwpid_of (thread)); | |
fa593d66 PA |
4488 | } |
4489 | ||
5fdda392 | 4490 | return; |
95954743 PA |
4491 | } |
4492 | } | |
2bd7c093 PA |
4493 | |
4494 | /* No resume action for this thread. */ | |
4495 | lwp->resume = NULL; | |
5544ad89 DJ |
4496 | } |
4497 | ||
df95181f TBA |
4498 | bool |
4499 | linux_process_target::resume_status_pending (thread_info *thread) | |
5544ad89 | 4500 | { |
d86d4aaf | 4501 | struct lwp_info *lwp = get_thread_lwp (thread); |
5544ad89 | 4502 | |
bd99dc85 PA |
4503 | /* LWPs which will not be resumed are not interesting, because |
4504 | we might not wait for them next time through linux_wait. */ | |
2bd7c093 | 4505 | if (lwp->resume == NULL) |
25c28b4d | 4506 | return false; |
64386c31 | 4507 | |
df95181f | 4508 | return thread_still_has_status_pending (thread); |
d50171e4 PA |
4509 | } |
4510 | ||
df95181f TBA |
4511 | bool |
4512 | linux_process_target::thread_needs_step_over (thread_info *thread) | |
d50171e4 | 4513 | { |
d86d4aaf | 4514 | struct lwp_info *lwp = get_thread_lwp (thread); |
0bfdf32f | 4515 | struct thread_info *saved_thread; |
d50171e4 | 4516 | CORE_ADDR pc; |
c06cbd92 YQ |
4517 | struct process_info *proc = get_thread_process (thread); |
4518 | ||
4519 | /* GDBserver is skipping the extra traps from the wrapper program, | |
4520 | don't have to do step over. */ | |
4521 | if (proc->tdesc == NULL) | |
eca55aec | 4522 | return false; |
d50171e4 PA |
4523 | |
4524 | /* LWPs which will not be resumed are not interesting, because we | |
4525 | might not wait for them next time through linux_wait. */ | |
4526 | ||
4527 | if (!lwp->stopped) | |
4528 | { | |
4529 | if (debug_threads) | |
87ce2a04 | 4530 | debug_printf ("Need step over [LWP %ld]? Ignoring, not stopped\n", |
d86d4aaf | 4531 | lwpid_of (thread)); |
eca55aec | 4532 | return false; |
d50171e4 PA |
4533 | } |
4534 | ||
8336d594 | 4535 | if (thread->last_resume_kind == resume_stop) |
d50171e4 PA |
4536 | { |
4537 | if (debug_threads) | |
87ce2a04 DE |
4538 | debug_printf ("Need step over [LWP %ld]? Ignoring, should remain" |
4539 | " stopped\n", | |
d86d4aaf | 4540 | lwpid_of (thread)); |
eca55aec | 4541 | return false; |
d50171e4 PA |
4542 | } |
4543 | ||
7984d532 PA |
4544 | gdb_assert (lwp->suspended >= 0); |
4545 | ||
4546 | if (lwp->suspended) | |
4547 | { | |
4548 | if (debug_threads) | |
87ce2a04 | 4549 | debug_printf ("Need step over [LWP %ld]? Ignoring, suspended\n", |
d86d4aaf | 4550 | lwpid_of (thread)); |
eca55aec | 4551 | return false; |
7984d532 PA |
4552 | } |
4553 | ||
bd99dc85 | 4554 | if (lwp->status_pending_p) |
d50171e4 PA |
4555 | { |
4556 | if (debug_threads) | |
87ce2a04 DE |
4557 | debug_printf ("Need step over [LWP %ld]? Ignoring, has pending" |
4558 | " status.\n", | |
d86d4aaf | 4559 | lwpid_of (thread)); |
eca55aec | 4560 | return false; |
d50171e4 PA |
4561 | } |
4562 | ||
4563 | /* Note: PC, not STOP_PC. Either GDB has adjusted the PC already, | |
4564 | or we have. */ | |
4565 | pc = get_pc (lwp); | |
4566 | ||
4567 | /* If the PC has changed since we stopped, then don't do anything, | |
4568 | and let the breakpoint/tracepoint be hit. This happens if, for | |
4569 | instance, GDB handled the decr_pc_after_break subtraction itself, | |
4570 | GDB is OOL stepping this thread, or the user has issued a "jump" | |
4571 | command, or poked thread's registers herself. */ | |
4572 | if (pc != lwp->stop_pc) | |
4573 | { | |
4574 | if (debug_threads) | |
87ce2a04 DE |
4575 | debug_printf ("Need step over [LWP %ld]? Cancelling, PC was changed. " |
4576 | "Old stop_pc was 0x%s, PC is now 0x%s\n", | |
d86d4aaf DE |
4577 | lwpid_of (thread), |
4578 | paddress (lwp->stop_pc), paddress (pc)); | |
eca55aec | 4579 | return false; |
d50171e4 PA |
4580 | } |
4581 | ||
484b3c32 YQ |
4582 | /* On software single step target, resume the inferior with signal |
4583 | rather than stepping over. */ | |
7582c77c | 4584 | if (supports_software_single_step () |
484b3c32 YQ |
4585 | && lwp->pending_signals != NULL |
4586 | && lwp_signal_can_be_delivered (lwp)) | |
4587 | { | |
4588 | if (debug_threads) | |
4589 | debug_printf ("Need step over [LWP %ld]? Ignoring, has pending" | |
4590 | " signals.\n", | |
4591 | lwpid_of (thread)); | |
4592 | ||
eca55aec | 4593 | return false; |
484b3c32 YQ |
4594 | } |
4595 | ||
0bfdf32f GB |
4596 | saved_thread = current_thread; |
4597 | current_thread = thread; | |
d50171e4 | 4598 | |
8b07ae33 | 4599 | /* We can only step over breakpoints we know about. */ |
fa593d66 | 4600 | if (breakpoint_here (pc) || fast_tracepoint_jump_here (pc)) |
d50171e4 | 4601 | { |
8b07ae33 | 4602 | /* Don't step over a breakpoint that GDB expects to hit |
9f3a5c85 LM |
4603 | though. If the condition is being evaluated on the target's side |
4604 | and it evaluate to false, step over this breakpoint as well. */ | |
4605 | if (gdb_breakpoint_here (pc) | |
d3ce09f5 SS |
4606 | && gdb_condition_true_at_breakpoint (pc) |
4607 | && gdb_no_commands_at_breakpoint (pc)) | |
8b07ae33 PA |
4608 | { |
4609 | if (debug_threads) | |
87ce2a04 DE |
4610 | debug_printf ("Need step over [LWP %ld]? yes, but found" |
4611 | " GDB breakpoint at 0x%s; skipping step over\n", | |
d86d4aaf | 4612 | lwpid_of (thread), paddress (pc)); |
d50171e4 | 4613 | |
0bfdf32f | 4614 | current_thread = saved_thread; |
eca55aec | 4615 | return false; |
8b07ae33 PA |
4616 | } |
4617 | else | |
4618 | { | |
4619 | if (debug_threads) | |
87ce2a04 DE |
4620 | debug_printf ("Need step over [LWP %ld]? yes, " |
4621 | "found breakpoint at 0x%s\n", | |
d86d4aaf | 4622 | lwpid_of (thread), paddress (pc)); |
d50171e4 | 4623 | |
8b07ae33 | 4624 | /* We've found an lwp that needs stepping over --- return 1 so |
8f86d7aa | 4625 | that find_thread stops looking. */ |
0bfdf32f | 4626 | current_thread = saved_thread; |
8b07ae33 | 4627 | |
eca55aec | 4628 | return true; |
8b07ae33 | 4629 | } |
d50171e4 PA |
4630 | } |
4631 | ||
0bfdf32f | 4632 | current_thread = saved_thread; |
d50171e4 PA |
4633 | |
4634 | if (debug_threads) | |
87ce2a04 DE |
4635 | debug_printf ("Need step over [LWP %ld]? No, no breakpoint found" |
4636 | " at 0x%s\n", | |
d86d4aaf | 4637 | lwpid_of (thread), paddress (pc)); |
c6ecbae5 | 4638 | |
eca55aec | 4639 | return false; |
5544ad89 DJ |
4640 | } |
4641 | ||
d16f3f6c TBA |
4642 | void |
4643 | linux_process_target::start_step_over (lwp_info *lwp) | |
d50171e4 | 4644 | { |
d86d4aaf | 4645 | struct thread_info *thread = get_lwp_thread (lwp); |
0bfdf32f | 4646 | struct thread_info *saved_thread; |
d50171e4 PA |
4647 | CORE_ADDR pc; |
4648 | int step; | |
4649 | ||
4650 | if (debug_threads) | |
87ce2a04 | 4651 | debug_printf ("Starting step-over on LWP %ld. Stopping all threads\n", |
d86d4aaf | 4652 | lwpid_of (thread)); |
d50171e4 | 4653 | |
7984d532 | 4654 | stop_all_lwps (1, lwp); |
863d01bd PA |
4655 | |
4656 | if (lwp->suspended != 0) | |
4657 | { | |
4658 | internal_error (__FILE__, __LINE__, | |
4659 | "LWP %ld suspended=%d\n", lwpid_of (thread), | |
4660 | lwp->suspended); | |
4661 | } | |
d50171e4 PA |
4662 | |
4663 | if (debug_threads) | |
87ce2a04 | 4664 | debug_printf ("Done stopping all threads for step-over.\n"); |
d50171e4 PA |
4665 | |
4666 | /* Note, we should always reach here with an already adjusted PC, | |
4667 | either by GDB (if we're resuming due to GDB's request), or by our | |
4668 | caller, if we just finished handling an internal breakpoint GDB | |
4669 | shouldn't care about. */ | |
4670 | pc = get_pc (lwp); | |
4671 | ||
0bfdf32f GB |
4672 | saved_thread = current_thread; |
4673 | current_thread = thread; | |
d50171e4 PA |
4674 | |
4675 | lwp->bp_reinsert = pc; | |
4676 | uninsert_breakpoints_at (pc); | |
fa593d66 | 4677 | uninsert_fast_tracepoint_jumps_at (pc); |
d50171e4 | 4678 | |
7fe5e27e | 4679 | step = single_step (lwp); |
d50171e4 | 4680 | |
0bfdf32f | 4681 | current_thread = saved_thread; |
d50171e4 | 4682 | |
df95181f | 4683 | resume_one_lwp (lwp, step, 0, NULL); |
d50171e4 PA |
4684 | |
4685 | /* Require next event from this LWP. */ | |
9c80ecd6 | 4686 | step_over_bkpt = thread->id; |
d50171e4 PA |
4687 | } |
4688 | ||
b31cdfa6 TBA |
4689 | bool |
4690 | linux_process_target::finish_step_over (lwp_info *lwp) | |
d50171e4 PA |
4691 | { |
4692 | if (lwp->bp_reinsert != 0) | |
4693 | { | |
f79b145d YQ |
4694 | struct thread_info *saved_thread = current_thread; |
4695 | ||
d50171e4 | 4696 | if (debug_threads) |
87ce2a04 | 4697 | debug_printf ("Finished step over.\n"); |
d50171e4 | 4698 | |
f79b145d YQ |
4699 | current_thread = get_lwp_thread (lwp); |
4700 | ||
d50171e4 PA |
4701 | /* Reinsert any breakpoint at LWP->BP_REINSERT. Note that there |
4702 | may be no breakpoint to reinsert there by now. */ | |
4703 | reinsert_breakpoints_at (lwp->bp_reinsert); | |
fa593d66 | 4704 | reinsert_fast_tracepoint_jumps_at (lwp->bp_reinsert); |
d50171e4 PA |
4705 | |
4706 | lwp->bp_reinsert = 0; | |
4707 | ||
3b9a79ef YQ |
4708 | /* Delete any single-step breakpoints. No longer needed. We |
4709 | don't have to worry about other threads hitting this trap, | |
4710 | and later not being able to explain it, because we were | |
4711 | stepping over a breakpoint, and we hold all threads but | |
4712 | LWP stopped while doing that. */ | |
b31cdfa6 | 4713 | if (!supports_hardware_single_step ()) |
f79b145d | 4714 | { |
3b9a79ef YQ |
4715 | gdb_assert (has_single_step_breakpoints (current_thread)); |
4716 | delete_single_step_breakpoints (current_thread); | |
f79b145d | 4717 | } |
d50171e4 PA |
4718 | |
4719 | step_over_bkpt = null_ptid; | |
f79b145d | 4720 | current_thread = saved_thread; |
b31cdfa6 | 4721 | return true; |
d50171e4 PA |
4722 | } |
4723 | else | |
b31cdfa6 | 4724 | return false; |
d50171e4 PA |
4725 | } |
4726 | ||
d16f3f6c TBA |
4727 | void |
4728 | linux_process_target::complete_ongoing_step_over () | |
863d01bd | 4729 | { |
d7e15655 | 4730 | if (step_over_bkpt != null_ptid) |
863d01bd PA |
4731 | { |
4732 | struct lwp_info *lwp; | |
4733 | int wstat; | |
4734 | int ret; | |
4735 | ||
4736 | if (debug_threads) | |
4737 | debug_printf ("detach: step over in progress, finish it first\n"); | |
4738 | ||
4739 | /* Passing NULL_PTID as filter indicates we want all events to | |
4740 | be left pending. Eventually this returns when there are no | |
4741 | unwaited-for children left. */ | |
d16f3f6c TBA |
4742 | ret = wait_for_event_filtered (minus_one_ptid, null_ptid, &wstat, |
4743 | __WALL); | |
863d01bd PA |
4744 | gdb_assert (ret == -1); |
4745 | ||
4746 | lwp = find_lwp_pid (step_over_bkpt); | |
4747 | if (lwp != NULL) | |
4748 | finish_step_over (lwp); | |
4749 | step_over_bkpt = null_ptid; | |
4750 | unsuspend_all_lwps (lwp); | |
4751 | } | |
4752 | } | |
4753 | ||
df95181f TBA |
4754 | void |
4755 | linux_process_target::resume_one_thread (thread_info *thread, | |
4756 | bool leave_all_stopped) | |
5544ad89 | 4757 | { |
d86d4aaf | 4758 | struct lwp_info *lwp = get_thread_lwp (thread); |
d50171e4 | 4759 | int leave_pending; |
5544ad89 | 4760 | |
2bd7c093 | 4761 | if (lwp->resume == NULL) |
c80825ff | 4762 | return; |
5544ad89 | 4763 | |
bd99dc85 | 4764 | if (lwp->resume->kind == resume_stop) |
5544ad89 | 4765 | { |
bd99dc85 | 4766 | if (debug_threads) |
d86d4aaf | 4767 | debug_printf ("resume_stop request for LWP %ld\n", lwpid_of (thread)); |
bd99dc85 PA |
4768 | |
4769 | if (!lwp->stopped) | |
4770 | { | |
4771 | if (debug_threads) | |
d86d4aaf | 4772 | debug_printf ("stopping LWP %ld\n", lwpid_of (thread)); |
bd99dc85 | 4773 | |
d50171e4 PA |
4774 | /* Stop the thread, and wait for the event asynchronously, |
4775 | through the event loop. */ | |
02fc4de7 | 4776 | send_sigstop (lwp); |
bd99dc85 PA |
4777 | } |
4778 | else | |
4779 | { | |
4780 | if (debug_threads) | |
87ce2a04 | 4781 | debug_printf ("already stopped LWP %ld\n", |
d86d4aaf | 4782 | lwpid_of (thread)); |
d50171e4 PA |
4783 | |
4784 | /* The LWP may have been stopped in an internal event that | |
4785 | was not meant to be notified back to GDB (e.g., gdbserver | |
4786 | breakpoint), so we should be reporting a stop event in | |
4787 | this case too. */ | |
4788 | ||
4789 | /* If the thread already has a pending SIGSTOP, this is a | |
4790 | no-op. Otherwise, something later will presumably resume | |
4791 | the thread and this will cause it to cancel any pending | |
4792 | operation, due to last_resume_kind == resume_stop. If | |
4793 | the thread already has a pending status to report, we | |
4794 | will still report it the next time we wait - see | |
4795 | status_pending_p_callback. */ | |
1a981360 PA |
4796 | |
4797 | /* If we already have a pending signal to report, then | |
4798 | there's no need to queue a SIGSTOP, as this means we're | |
4799 | midway through moving the LWP out of the jumppad, and we | |
4800 | will report the pending signal as soon as that is | |
4801 | finished. */ | |
4802 | if (lwp->pending_signals_to_report == NULL) | |
4803 | send_sigstop (lwp); | |
bd99dc85 | 4804 | } |
32ca6d61 | 4805 | |
bd99dc85 PA |
4806 | /* For stop requests, we're done. */ |
4807 | lwp->resume = NULL; | |
fc7238bb | 4808 | thread->last_status.kind = TARGET_WAITKIND_IGNORE; |
c80825ff | 4809 | return; |
5544ad89 DJ |
4810 | } |
4811 | ||
bd99dc85 | 4812 | /* If this thread which is about to be resumed has a pending status, |
863d01bd PA |
4813 | then don't resume it - we can just report the pending status. |
4814 | Likewise if it is suspended, because e.g., another thread is | |
4815 | stepping past a breakpoint. Make sure to queue any signals that | |
4816 | would otherwise be sent. In all-stop mode, we do this decision | |
4817 | based on if *any* thread has a pending status. If there's a | |
4818 | thread that needs the step-over-breakpoint dance, then don't | |
4819 | resume any other thread but that particular one. */ | |
4820 | leave_pending = (lwp->suspended | |
4821 | || lwp->status_pending_p | |
4822 | || leave_all_stopped); | |
5544ad89 | 4823 | |
0e9a339e YQ |
4824 | /* If we have a new signal, enqueue the signal. */ |
4825 | if (lwp->resume->sig != 0) | |
4826 | { | |
4827 | siginfo_t info, *info_p; | |
4828 | ||
4829 | /* If this is the same signal we were previously stopped by, | |
4830 | make sure to queue its siginfo. */ | |
4831 | if (WIFSTOPPED (lwp->last_status) | |
4832 | && WSTOPSIG (lwp->last_status) == lwp->resume->sig | |
4833 | && ptrace (PTRACE_GETSIGINFO, lwpid_of (thread), | |
4834 | (PTRACE_TYPE_ARG3) 0, &info) == 0) | |
4835 | info_p = &info; | |
4836 | else | |
4837 | info_p = NULL; | |
4838 | ||
4839 | enqueue_pending_signal (lwp, lwp->resume->sig, info_p); | |
4840 | } | |
4841 | ||
d50171e4 | 4842 | if (!leave_pending) |
bd99dc85 PA |
4843 | { |
4844 | if (debug_threads) | |
d86d4aaf | 4845 | debug_printf ("resuming LWP %ld\n", lwpid_of (thread)); |
5544ad89 | 4846 | |
9c80ecd6 | 4847 | proceed_one_lwp (thread, NULL); |
bd99dc85 PA |
4848 | } |
4849 | else | |
4850 | { | |
4851 | if (debug_threads) | |
d86d4aaf | 4852 | debug_printf ("leaving LWP %ld stopped\n", lwpid_of (thread)); |
bd99dc85 | 4853 | } |
5544ad89 | 4854 | |
fc7238bb | 4855 | thread->last_status.kind = TARGET_WAITKIND_IGNORE; |
bd99dc85 | 4856 | lwp->resume = NULL; |
0d62e5e8 DJ |
4857 | } |
4858 | ||
0e4d7e35 TBA |
4859 | void |
4860 | linux_process_target::resume (thread_resume *resume_info, size_t n) | |
0d62e5e8 | 4861 | { |
d86d4aaf | 4862 | struct thread_info *need_step_over = NULL; |
c6ecbae5 | 4863 | |
87ce2a04 DE |
4864 | if (debug_threads) |
4865 | { | |
4866 | debug_enter (); | |
4867 | debug_printf ("linux_resume:\n"); | |
4868 | } | |
4869 | ||
5fdda392 SM |
4870 | for_each_thread ([&] (thread_info *thread) |
4871 | { | |
4872 | linux_set_resume_request (thread, resume_info, n); | |
4873 | }); | |
5544ad89 | 4874 | |
d50171e4 PA |
4875 | /* If there is a thread which would otherwise be resumed, which has |
4876 | a pending status, then don't resume any threads - we can just | |
4877 | report the pending status. Make sure to queue any signals that | |
4878 | would otherwise be sent. In non-stop mode, we'll apply this | |
4879 | logic to each thread individually. We consume all pending events | |
4880 | before considering to start a step-over (in all-stop). */ | |
25c28b4d | 4881 | bool any_pending = false; |
bd99dc85 | 4882 | if (!non_stop) |
df95181f TBA |
4883 | any_pending = find_thread ([this] (thread_info *thread) |
4884 | { | |
4885 | return resume_status_pending (thread); | |
4886 | }) != nullptr; | |
d50171e4 PA |
4887 | |
4888 | /* If there is a thread which would otherwise be resumed, which is | |
4889 | stopped at a breakpoint that needs stepping over, then don't | |
4890 | resume any threads - have it step over the breakpoint with all | |
4891 | other threads stopped, then resume all threads again. Make sure | |
4892 | to queue any signals that would otherwise be delivered or | |
4893 | queued. */ | |
bf9ae9d8 | 4894 | if (!any_pending && low_supports_breakpoints ()) |
df95181f TBA |
4895 | need_step_over = find_thread ([this] (thread_info *thread) |
4896 | { | |
4897 | return thread_needs_step_over (thread); | |
4898 | }); | |
d50171e4 | 4899 | |
c80825ff | 4900 | bool leave_all_stopped = (need_step_over != NULL || any_pending); |
d50171e4 PA |
4901 | |
4902 | if (debug_threads) | |
4903 | { | |
4904 | if (need_step_over != NULL) | |
87ce2a04 | 4905 | debug_printf ("Not resuming all, need step over\n"); |
d50171e4 | 4906 | else if (any_pending) |
87ce2a04 DE |
4907 | debug_printf ("Not resuming, all-stop and found " |
4908 | "an LWP with pending status\n"); | |
d50171e4 | 4909 | else |
87ce2a04 | 4910 | debug_printf ("Resuming, no pending status or step over needed\n"); |
d50171e4 PA |
4911 | } |
4912 | ||
4913 | /* Even if we're leaving threads stopped, queue all signals we'd | |
4914 | otherwise deliver. */ | |
c80825ff SM |
4915 | for_each_thread ([&] (thread_info *thread) |
4916 | { | |
df95181f | 4917 | resume_one_thread (thread, leave_all_stopped); |
c80825ff | 4918 | }); |
d50171e4 PA |
4919 | |
4920 | if (need_step_over) | |
d86d4aaf | 4921 | start_step_over (get_thread_lwp (need_step_over)); |
87ce2a04 DE |
4922 | |
4923 | if (debug_threads) | |
4924 | { | |
4925 | debug_printf ("linux_resume done\n"); | |
4926 | debug_exit (); | |
4927 | } | |
1bebeeca PA |
4928 | |
4929 | /* We may have events that were pending that can/should be sent to | |
4930 | the client now. Trigger a linux_wait call. */ | |
4931 | if (target_is_async_p ()) | |
4932 | async_file_mark (); | |
d50171e4 PA |
4933 | } |
4934 | ||
df95181f TBA |
4935 | void |
4936 | linux_process_target::proceed_one_lwp (thread_info *thread, lwp_info *except) | |
d50171e4 | 4937 | { |
d86d4aaf | 4938 | struct lwp_info *lwp = get_thread_lwp (thread); |
d50171e4 PA |
4939 | int step; |
4940 | ||
7984d532 | 4941 | if (lwp == except) |
e2b44075 | 4942 | return; |
d50171e4 PA |
4943 | |
4944 | if (debug_threads) | |
d86d4aaf | 4945 | debug_printf ("proceed_one_lwp: lwp %ld\n", lwpid_of (thread)); |
d50171e4 PA |
4946 | |
4947 | if (!lwp->stopped) | |
4948 | { | |
4949 | if (debug_threads) | |
d86d4aaf | 4950 | debug_printf (" LWP %ld already running\n", lwpid_of (thread)); |
e2b44075 | 4951 | return; |
d50171e4 PA |
4952 | } |
4953 | ||
02fc4de7 PA |
4954 | if (thread->last_resume_kind == resume_stop |
4955 | && thread->last_status.kind != TARGET_WAITKIND_IGNORE) | |
d50171e4 PA |
4956 | { |
4957 | if (debug_threads) | |
87ce2a04 | 4958 | debug_printf (" client wants LWP to remain %ld stopped\n", |
d86d4aaf | 4959 | lwpid_of (thread)); |
e2b44075 | 4960 | return; |
d50171e4 PA |
4961 | } |
4962 | ||
4963 | if (lwp->status_pending_p) | |
4964 | { | |
4965 | if (debug_threads) | |
87ce2a04 | 4966 | debug_printf (" LWP %ld has pending status, leaving stopped\n", |
d86d4aaf | 4967 | lwpid_of (thread)); |
e2b44075 | 4968 | return; |
d50171e4 PA |
4969 | } |
4970 | ||
7984d532 PA |
4971 | gdb_assert (lwp->suspended >= 0); |
4972 | ||
d50171e4 PA |
4973 | if (lwp->suspended) |
4974 | { | |
4975 | if (debug_threads) | |
d86d4aaf | 4976 | debug_printf (" LWP %ld is suspended\n", lwpid_of (thread)); |
e2b44075 | 4977 | return; |
d50171e4 PA |
4978 | } |
4979 | ||
1a981360 PA |
4980 | if (thread->last_resume_kind == resume_stop |
4981 | && lwp->pending_signals_to_report == NULL | |
229d26fc SM |
4982 | && (lwp->collecting_fast_tracepoint |
4983 | == fast_tpoint_collect_result::not_collecting)) | |
02fc4de7 PA |
4984 | { |
4985 | /* We haven't reported this LWP as stopped yet (otherwise, the | |
4986 | last_status.kind check above would catch it, and we wouldn't | |
4987 | reach here. This LWP may have been momentarily paused by a | |
4988 | stop_all_lwps call while handling for example, another LWP's | |
4989 | step-over. In that case, the pending expected SIGSTOP signal | |
4990 | that was queued at vCont;t handling time will have already | |
4991 | been consumed by wait_for_sigstop, and so we need to requeue | |
4992 | another one here. Note that if the LWP already has a SIGSTOP | |
4993 | pending, this is a no-op. */ | |
4994 | ||
4995 | if (debug_threads) | |
87ce2a04 DE |
4996 | debug_printf ("Client wants LWP %ld to stop. " |
4997 | "Making sure it has a SIGSTOP pending\n", | |
d86d4aaf | 4998 | lwpid_of (thread)); |
02fc4de7 PA |
4999 | |
5000 | send_sigstop (lwp); | |
5001 | } | |
5002 | ||
863d01bd PA |
5003 | if (thread->last_resume_kind == resume_step) |
5004 | { | |
5005 | if (debug_threads) | |
5006 | debug_printf (" stepping LWP %ld, client wants it stepping\n", | |
5007 | lwpid_of (thread)); | |
8901d193 | 5008 | |
3b9a79ef | 5009 | /* If resume_step is requested by GDB, install single-step |
8901d193 | 5010 | breakpoints when the thread is about to be actually resumed if |
3b9a79ef | 5011 | the single-step breakpoints weren't removed. */ |
7582c77c | 5012 | if (supports_software_single_step () |
3b9a79ef | 5013 | && !has_single_step_breakpoints (thread)) |
8901d193 YQ |
5014 | install_software_single_step_breakpoints (lwp); |
5015 | ||
5016 | step = maybe_hw_step (thread); | |
863d01bd PA |
5017 | } |
5018 | else if (lwp->bp_reinsert != 0) | |
5019 | { | |
5020 | if (debug_threads) | |
5021 | debug_printf (" stepping LWP %ld, reinsert set\n", | |
5022 | lwpid_of (thread)); | |
f79b145d YQ |
5023 | |
5024 | step = maybe_hw_step (thread); | |
863d01bd PA |
5025 | } |
5026 | else | |
5027 | step = 0; | |
5028 | ||
df95181f | 5029 | resume_one_lwp (lwp, step, 0, NULL); |
7984d532 PA |
5030 | } |
5031 | ||
df95181f TBA |
5032 | void |
5033 | linux_process_target::unsuspend_and_proceed_one_lwp (thread_info *thread, | |
5034 | lwp_info *except) | |
7984d532 | 5035 | { |
d86d4aaf | 5036 | struct lwp_info *lwp = get_thread_lwp (thread); |
7984d532 PA |
5037 | |
5038 | if (lwp == except) | |
e2b44075 | 5039 | return; |
7984d532 | 5040 | |
863d01bd | 5041 | lwp_suspended_decr (lwp); |
7984d532 | 5042 | |
e2b44075 | 5043 | proceed_one_lwp (thread, except); |
d50171e4 PA |
5044 | } |
5045 | ||
d16f3f6c TBA |
5046 | void |
5047 | linux_process_target::proceed_all_lwps () | |
d50171e4 | 5048 | { |
d86d4aaf | 5049 | struct thread_info *need_step_over; |
d50171e4 PA |
5050 | |
5051 | /* If there is a thread which would otherwise be resumed, which is | |
5052 | stopped at a breakpoint that needs stepping over, then don't | |
5053 | resume any threads - have it step over the breakpoint with all | |
5054 | other threads stopped, then resume all threads again. */ | |
5055 | ||
bf9ae9d8 | 5056 | if (low_supports_breakpoints ()) |
d50171e4 | 5057 | { |
df95181f TBA |
5058 | need_step_over = find_thread ([this] (thread_info *thread) |
5059 | { | |
5060 | return thread_needs_step_over (thread); | |
5061 | }); | |
d50171e4 PA |
5062 | |
5063 | if (need_step_over != NULL) | |
5064 | { | |
5065 | if (debug_threads) | |
87ce2a04 DE |
5066 | debug_printf ("proceed_all_lwps: found " |
5067 | "thread %ld needing a step-over\n", | |
5068 | lwpid_of (need_step_over)); | |
d50171e4 | 5069 | |
d86d4aaf | 5070 | start_step_over (get_thread_lwp (need_step_over)); |
d50171e4 PA |
5071 | return; |
5072 | } | |
5073 | } | |
5544ad89 | 5074 | |
d50171e4 | 5075 | if (debug_threads) |
87ce2a04 | 5076 | debug_printf ("Proceeding, no step-over needed\n"); |
d50171e4 | 5077 | |
df95181f | 5078 | for_each_thread ([this] (thread_info *thread) |
e2b44075 SM |
5079 | { |
5080 | proceed_one_lwp (thread, NULL); | |
5081 | }); | |
d50171e4 PA |
5082 | } |
5083 | ||
d16f3f6c TBA |
5084 | void |
5085 | linux_process_target::unstop_all_lwps (int unsuspend, lwp_info *except) | |
d50171e4 | 5086 | { |
5544ad89 DJ |
5087 | if (debug_threads) |
5088 | { | |
87ce2a04 | 5089 | debug_enter (); |
d50171e4 | 5090 | if (except) |
87ce2a04 | 5091 | debug_printf ("unstopping all lwps, except=(LWP %ld)\n", |
d86d4aaf | 5092 | lwpid_of (get_lwp_thread (except))); |
5544ad89 | 5093 | else |
87ce2a04 | 5094 | debug_printf ("unstopping all lwps\n"); |
5544ad89 DJ |
5095 | } |
5096 | ||
7984d532 | 5097 | if (unsuspend) |
e2b44075 SM |
5098 | for_each_thread ([&] (thread_info *thread) |
5099 | { | |
5100 | unsuspend_and_proceed_one_lwp (thread, except); | |
5101 | }); | |
7984d532 | 5102 | else |
e2b44075 SM |
5103 | for_each_thread ([&] (thread_info *thread) |
5104 | { | |
5105 | proceed_one_lwp (thread, except); | |
5106 | }); | |
87ce2a04 DE |
5107 | |
5108 | if (debug_threads) | |
5109 | { | |
5110 | debug_printf ("unstop_all_lwps done\n"); | |
5111 | debug_exit (); | |
5112 | } | |
0d62e5e8 DJ |
5113 | } |
5114 | ||
58caa3dc DJ |
5115 | |
5116 | #ifdef HAVE_LINUX_REGSETS | |
5117 | ||
1faeff08 MR |
5118 | #define use_linux_regsets 1 |
5119 | ||
030031ee PA |
5120 | /* Returns true if REGSET has been disabled. */ |
5121 | ||
5122 | static int | |
5123 | regset_disabled (struct regsets_info *info, struct regset_info *regset) | |
5124 | { | |
5125 | return (info->disabled_regsets != NULL | |
5126 | && info->disabled_regsets[regset - info->regsets]); | |
5127 | } | |
5128 | ||
5129 | /* Disable REGSET. */ | |
5130 | ||
5131 | static void | |
5132 | disable_regset (struct regsets_info *info, struct regset_info *regset) | |
5133 | { | |
5134 | int dr_offset; | |
5135 | ||
5136 | dr_offset = regset - info->regsets; | |
5137 | if (info->disabled_regsets == NULL) | |
224c3ddb | 5138 | info->disabled_regsets = (char *) xcalloc (1, info->num_regsets); |
030031ee PA |
5139 | info->disabled_regsets[dr_offset] = 1; |
5140 | } | |
5141 | ||
58caa3dc | 5142 | static int |
3aee8918 PA |
5143 | regsets_fetch_inferior_registers (struct regsets_info *regsets_info, |
5144 | struct regcache *regcache) | |
58caa3dc DJ |
5145 | { |
5146 | struct regset_info *regset; | |
e9d25b98 | 5147 | int saw_general_regs = 0; |
95954743 | 5148 | int pid; |
1570b33e | 5149 | struct iovec iov; |
58caa3dc | 5150 | |
0bfdf32f | 5151 | pid = lwpid_of (current_thread); |
28eef672 | 5152 | for (regset = regsets_info->regsets; regset->size >= 0; regset++) |
58caa3dc | 5153 | { |
1570b33e L |
5154 | void *buf, *data; |
5155 | int nt_type, res; | |
58caa3dc | 5156 | |
030031ee | 5157 | if (regset->size == 0 || regset_disabled (regsets_info, regset)) |
28eef672 | 5158 | continue; |
58caa3dc | 5159 | |
bca929d3 | 5160 | buf = xmalloc (regset->size); |
1570b33e L |
5161 | |
5162 | nt_type = regset->nt_type; | |
5163 | if (nt_type) | |
5164 | { | |
5165 | iov.iov_base = buf; | |
5166 | iov.iov_len = regset->size; | |
5167 | data = (void *) &iov; | |
5168 | } | |
5169 | else | |
5170 | data = buf; | |
5171 | ||
dfb64f85 | 5172 | #ifndef __sparc__ |
f15f9948 | 5173 | res = ptrace (regset->get_request, pid, |
b8e1b30e | 5174 | (PTRACE_TYPE_ARG3) (long) nt_type, data); |
dfb64f85 | 5175 | #else |
1570b33e | 5176 | res = ptrace (regset->get_request, pid, data, nt_type); |
dfb64f85 | 5177 | #endif |
58caa3dc DJ |
5178 | if (res < 0) |
5179 | { | |
1ef53e6b AH |
5180 | if (errno == EIO |
5181 | || (errno == EINVAL && regset->type == OPTIONAL_REGS)) | |
58caa3dc | 5182 | { |
1ef53e6b AH |
5183 | /* If we get EIO on a regset, or an EINVAL and the regset is |
5184 | optional, do not try it again for this process mode. */ | |
030031ee | 5185 | disable_regset (regsets_info, regset); |
58caa3dc | 5186 | } |
e5a9158d AA |
5187 | else if (errno == ENODATA) |
5188 | { | |
5189 | /* ENODATA may be returned if the regset is currently | |
5190 | not "active". This can happen in normal operation, | |
5191 | so suppress the warning in this case. */ | |
5192 | } | |
fcd4a73d YQ |
5193 | else if (errno == ESRCH) |
5194 | { | |
5195 | /* At this point, ESRCH should mean the process is | |
5196 | already gone, in which case we simply ignore attempts | |
5197 | to read its registers. */ | |
5198 | } | |
58caa3dc DJ |
5199 | else |
5200 | { | |
0d62e5e8 | 5201 | char s[256]; |
95954743 PA |
5202 | sprintf (s, "ptrace(regsets_fetch_inferior_registers) PID=%d", |
5203 | pid); | |
0d62e5e8 | 5204 | perror (s); |
58caa3dc DJ |
5205 | } |
5206 | } | |
098dbe61 AA |
5207 | else |
5208 | { | |
5209 | if (regset->type == GENERAL_REGS) | |
5210 | saw_general_regs = 1; | |
5211 | regset->store_function (regcache, buf); | |
5212 | } | |
fdeb2a12 | 5213 | free (buf); |
58caa3dc | 5214 | } |
e9d25b98 DJ |
5215 | if (saw_general_regs) |
5216 | return 0; | |
5217 | else | |
5218 | return 1; | |
58caa3dc DJ |
5219 | } |
5220 | ||
5221 | static int | |
3aee8918 PA |
5222 | regsets_store_inferior_registers (struct regsets_info *regsets_info, |
5223 | struct regcache *regcache) | |
58caa3dc DJ |
5224 | { |
5225 | struct regset_info *regset; | |
e9d25b98 | 5226 | int saw_general_regs = 0; |
95954743 | 5227 | int pid; |
1570b33e | 5228 | struct iovec iov; |
58caa3dc | 5229 | |
0bfdf32f | 5230 | pid = lwpid_of (current_thread); |
28eef672 | 5231 | for (regset = regsets_info->regsets; regset->size >= 0; regset++) |
58caa3dc | 5232 | { |
1570b33e L |
5233 | void *buf, *data; |
5234 | int nt_type, res; | |
58caa3dc | 5235 | |
feea5f36 AA |
5236 | if (regset->size == 0 || regset_disabled (regsets_info, regset) |
5237 | || regset->fill_function == NULL) | |
28eef672 | 5238 | continue; |
58caa3dc | 5239 | |
bca929d3 | 5240 | buf = xmalloc (regset->size); |
545587ee DJ |
5241 | |
5242 | /* First fill the buffer with the current register set contents, | |
5243 | in case there are any items in the kernel's regset that are | |
5244 | not in gdbserver's regcache. */ | |
1570b33e L |
5245 | |
5246 | nt_type = regset->nt_type; | |
5247 | if (nt_type) | |
5248 | { | |
5249 | iov.iov_base = buf; | |
5250 | iov.iov_len = regset->size; | |
5251 | data = (void *) &iov; | |
5252 | } | |
5253 | else | |
5254 | data = buf; | |
5255 | ||
dfb64f85 | 5256 | #ifndef __sparc__ |
f15f9948 | 5257 | res = ptrace (regset->get_request, pid, |
b8e1b30e | 5258 | (PTRACE_TYPE_ARG3) (long) nt_type, data); |
dfb64f85 | 5259 | #else |
689cc2ae | 5260 | res = ptrace (regset->get_request, pid, data, nt_type); |
dfb64f85 | 5261 | #endif |
545587ee DJ |
5262 | |
5263 | if (res == 0) | |
5264 | { | |
5265 | /* Then overlay our cached registers on that. */ | |
442ea881 | 5266 | regset->fill_function (regcache, buf); |
545587ee DJ |
5267 | |
5268 | /* Only now do we write the register set. */ | |
dfb64f85 | 5269 | #ifndef __sparc__ |
f15f9948 | 5270 | res = ptrace (regset->set_request, pid, |
b8e1b30e | 5271 | (PTRACE_TYPE_ARG3) (long) nt_type, data); |
dfb64f85 | 5272 | #else |
1570b33e | 5273 | res = ptrace (regset->set_request, pid, data, nt_type); |
dfb64f85 | 5274 | #endif |
545587ee DJ |
5275 | } |
5276 | ||
58caa3dc DJ |
5277 | if (res < 0) |
5278 | { | |
1ef53e6b AH |
5279 | if (errno == EIO |
5280 | || (errno == EINVAL && regset->type == OPTIONAL_REGS)) | |
58caa3dc | 5281 | { |
1ef53e6b AH |
5282 | /* If we get EIO on a regset, or an EINVAL and the regset is |
5283 | optional, do not try it again for this process mode. */ | |
030031ee | 5284 | disable_regset (regsets_info, regset); |
58caa3dc | 5285 | } |
3221518c UW |
5286 | else if (errno == ESRCH) |
5287 | { | |
1b3f6016 PA |
5288 | /* At this point, ESRCH should mean the process is |
5289 | already gone, in which case we simply ignore attempts | |
5290 | to change its registers. See also the related | |
df95181f | 5291 | comment in resume_one_lwp. */ |
fdeb2a12 | 5292 | free (buf); |
3221518c UW |
5293 | return 0; |
5294 | } | |
58caa3dc DJ |
5295 | else |
5296 | { | |
ce3a066d | 5297 | perror ("Warning: ptrace(regsets_store_inferior_registers)"); |
58caa3dc DJ |
5298 | } |
5299 | } | |
e9d25b98 DJ |
5300 | else if (regset->type == GENERAL_REGS) |
5301 | saw_general_regs = 1; | |
09ec9b38 | 5302 | free (buf); |
58caa3dc | 5303 | } |
e9d25b98 DJ |
5304 | if (saw_general_regs) |
5305 | return 0; | |
5306 | else | |
5307 | return 1; | |
58caa3dc DJ |
5308 | } |
5309 | ||
1faeff08 | 5310 | #else /* !HAVE_LINUX_REGSETS */ |
58caa3dc | 5311 | |
1faeff08 | 5312 | #define use_linux_regsets 0 |
3aee8918 PA |
5313 | #define regsets_fetch_inferior_registers(regsets_info, regcache) 1 |
5314 | #define regsets_store_inferior_registers(regsets_info, regcache) 1 | |
58caa3dc | 5315 | |
58caa3dc | 5316 | #endif |
1faeff08 MR |
5317 | |
5318 | /* Return 1 if register REGNO is supported by one of the regset ptrace | |
5319 | calls or 0 if it has to be transferred individually. */ | |
5320 | ||
5321 | static int | |
3aee8918 | 5322 | linux_register_in_regsets (const struct regs_info *regs_info, int regno) |
1faeff08 MR |
5323 | { |
5324 | unsigned char mask = 1 << (regno % 8); | |
5325 | size_t index = regno / 8; | |
5326 | ||
5327 | return (use_linux_regsets | |
3aee8918 PA |
5328 | && (regs_info->regset_bitmap == NULL |
5329 | || (regs_info->regset_bitmap[index] & mask) != 0)); | |
1faeff08 MR |
5330 | } |
5331 | ||
58caa3dc | 5332 | #ifdef HAVE_LINUX_USRREGS |
1faeff08 | 5333 | |
5b3da067 | 5334 | static int |
3aee8918 | 5335 | register_addr (const struct usrregs_info *usrregs, int regnum) |
1faeff08 MR |
5336 | { |
5337 | int addr; | |
5338 | ||
3aee8918 | 5339 | if (regnum < 0 || regnum >= usrregs->num_regs) |
1faeff08 MR |
5340 | error ("Invalid register number %d.", regnum); |
5341 | ||
3aee8918 | 5342 | addr = usrregs->regmap[regnum]; |
1faeff08 MR |
5343 | |
5344 | return addr; | |
5345 | } | |
5346 | ||
daca57a7 TBA |
5347 | |
5348 | void | |
5349 | linux_process_target::fetch_register (const usrregs_info *usrregs, | |
5350 | regcache *regcache, int regno) | |
1faeff08 MR |
5351 | { |
5352 | CORE_ADDR regaddr; | |
5353 | int i, size; | |
5354 | char *buf; | |
5355 | int pid; | |
5356 | ||
3aee8918 | 5357 | if (regno >= usrregs->num_regs) |
1faeff08 | 5358 | return; |
daca57a7 | 5359 | if (low_cannot_fetch_register (regno)) |
1faeff08 MR |
5360 | return; |
5361 | ||
3aee8918 | 5362 | regaddr = register_addr (usrregs, regno); |
1faeff08 MR |
5363 | if (regaddr == -1) |
5364 | return; | |
5365 | ||
3aee8918 PA |
5366 | size = ((register_size (regcache->tdesc, regno) |
5367 | + sizeof (PTRACE_XFER_TYPE) - 1) | |
1faeff08 | 5368 | & -sizeof (PTRACE_XFER_TYPE)); |
224c3ddb | 5369 | buf = (char *) alloca (size); |
1faeff08 | 5370 | |
0bfdf32f | 5371 | pid = lwpid_of (current_thread); |
1faeff08 MR |
5372 | for (i = 0; i < size; i += sizeof (PTRACE_XFER_TYPE)) |
5373 | { | |
5374 | errno = 0; | |
5375 | *(PTRACE_XFER_TYPE *) (buf + i) = | |
5376 | ptrace (PTRACE_PEEKUSER, pid, | |
5377 | /* Coerce to a uintptr_t first to avoid potential gcc warning | |
5378 | of coercing an 8 byte integer to a 4 byte pointer. */ | |
b8e1b30e | 5379 | (PTRACE_TYPE_ARG3) (uintptr_t) regaddr, (PTRACE_TYPE_ARG4) 0); |
1faeff08 MR |
5380 | regaddr += sizeof (PTRACE_XFER_TYPE); |
5381 | if (errno != 0) | |
9a70f35c YQ |
5382 | { |
5383 | /* Mark register REGNO unavailable. */ | |
5384 | supply_register (regcache, regno, NULL); | |
5385 | return; | |
5386 | } | |
1faeff08 MR |
5387 | } |
5388 | ||
b35db733 | 5389 | low_supply_ptrace_register (regcache, regno, buf); |
1faeff08 MR |
5390 | } |
5391 | ||
daca57a7 TBA |
5392 | void |
5393 | linux_process_target::store_register (const usrregs_info *usrregs, | |
5394 | regcache *regcache, int regno) | |
1faeff08 MR |
5395 | { |
5396 | CORE_ADDR regaddr; | |
5397 | int i, size; | |
5398 | char *buf; | |
5399 | int pid; | |
5400 | ||
3aee8918 | 5401 | if (regno >= usrregs->num_regs) |
1faeff08 | 5402 | return; |
daca57a7 | 5403 | if (low_cannot_store_register (regno)) |
1faeff08 MR |
5404 | return; |
5405 | ||
3aee8918 | 5406 | regaddr = register_addr (usrregs, regno); |
1faeff08 MR |
5407 | if (regaddr == -1) |
5408 | return; | |
5409 | ||
3aee8918 PA |
5410 | size = ((register_size (regcache->tdesc, regno) |
5411 | + sizeof (PTRACE_XFER_TYPE) - 1) | |
1faeff08 | 5412 | & -sizeof (PTRACE_XFER_TYPE)); |
224c3ddb | 5413 | buf = (char *) alloca (size); |
1faeff08 MR |
5414 | memset (buf, 0, size); |
5415 | ||
b35db733 | 5416 | low_collect_ptrace_register (regcache, regno, buf); |
1faeff08 | 5417 | |
0bfdf32f | 5418 | pid = lwpid_of (current_thread); |
1faeff08 MR |
5419 | for (i = 0; i < size; i += sizeof (PTRACE_XFER_TYPE)) |
5420 | { | |
5421 | errno = 0; | |
5422 | ptrace (PTRACE_POKEUSER, pid, | |
5423 | /* Coerce to a uintptr_t first to avoid potential gcc warning | |
5424 | about coercing an 8 byte integer to a 4 byte pointer. */ | |
b8e1b30e LM |
5425 | (PTRACE_TYPE_ARG3) (uintptr_t) regaddr, |
5426 | (PTRACE_TYPE_ARG4) *(PTRACE_XFER_TYPE *) (buf + i)); | |
1faeff08 MR |
5427 | if (errno != 0) |
5428 | { | |
5429 | /* At this point, ESRCH should mean the process is | |
5430 | already gone, in which case we simply ignore attempts | |
5431 | to change its registers. See also the related | |
df95181f | 5432 | comment in resume_one_lwp. */ |
1faeff08 MR |
5433 | if (errno == ESRCH) |
5434 | return; | |
5435 | ||
daca57a7 TBA |
5436 | |
5437 | if (!low_cannot_store_register (regno)) | |
6d91ce9a | 5438 | error ("writing register %d: %s", regno, safe_strerror (errno)); |
1faeff08 MR |
5439 | } |
5440 | regaddr += sizeof (PTRACE_XFER_TYPE); | |
5441 | } | |
5442 | } | |
daca57a7 | 5443 | #endif /* HAVE_LINUX_USRREGS */ |
1faeff08 | 5444 | |
b35db733 TBA |
5445 | void |
5446 | linux_process_target::low_collect_ptrace_register (regcache *regcache, | |
5447 | int regno, char *buf) | |
5448 | { | |
5449 | collect_register (regcache, regno, buf); | |
5450 | } | |
5451 | ||
5452 | void | |
5453 | linux_process_target::low_supply_ptrace_register (regcache *regcache, | |
5454 | int regno, const char *buf) | |
5455 | { | |
5456 | supply_register (regcache, regno, buf); | |
5457 | } | |
5458 | ||
daca57a7 TBA |
5459 | void |
5460 | linux_process_target::usr_fetch_inferior_registers (const regs_info *regs_info, | |
5461 | regcache *regcache, | |
5462 | int regno, int all) | |
1faeff08 | 5463 | { |
daca57a7 | 5464 | #ifdef HAVE_LINUX_USRREGS |
3aee8918 PA |
5465 | struct usrregs_info *usr = regs_info->usrregs; |
5466 | ||
1faeff08 MR |
5467 | if (regno == -1) |
5468 | { | |
3aee8918 PA |
5469 | for (regno = 0; regno < usr->num_regs; regno++) |
5470 | if (all || !linux_register_in_regsets (regs_info, regno)) | |
5471 | fetch_register (usr, regcache, regno); | |
1faeff08 MR |
5472 | } |
5473 | else | |
3aee8918 | 5474 | fetch_register (usr, regcache, regno); |
daca57a7 | 5475 | #endif |
1faeff08 MR |
5476 | } |
5477 | ||
daca57a7 TBA |
5478 | void |
5479 | linux_process_target::usr_store_inferior_registers (const regs_info *regs_info, | |
5480 | regcache *regcache, | |
5481 | int regno, int all) | |
1faeff08 | 5482 | { |
daca57a7 | 5483 | #ifdef HAVE_LINUX_USRREGS |
3aee8918 PA |
5484 | struct usrregs_info *usr = regs_info->usrregs; |
5485 | ||
1faeff08 MR |
5486 | if (regno == -1) |
5487 | { | |
3aee8918 PA |
5488 | for (regno = 0; regno < usr->num_regs; regno++) |
5489 | if (all || !linux_register_in_regsets (regs_info, regno)) | |
5490 | store_register (usr, regcache, regno); | |
1faeff08 MR |
5491 | } |
5492 | else | |
3aee8918 | 5493 | store_register (usr, regcache, regno); |
58caa3dc | 5494 | #endif |
daca57a7 | 5495 | } |
1faeff08 | 5496 | |
a5a4d4cd TBA |
5497 | void |
5498 | linux_process_target::fetch_registers (regcache *regcache, int regno) | |
1faeff08 MR |
5499 | { |
5500 | int use_regsets; | |
5501 | int all = 0; | |
aa8d21c9 | 5502 | const regs_info *regs_info = get_regs_info (); |
1faeff08 MR |
5503 | |
5504 | if (regno == -1) | |
5505 | { | |
bd70b1f2 | 5506 | if (regs_info->usrregs != NULL) |
3aee8918 | 5507 | for (regno = 0; regno < regs_info->usrregs->num_regs; regno++) |
bd70b1f2 | 5508 | low_fetch_register (regcache, regno); |
c14dfd32 | 5509 | |
3aee8918 PA |
5510 | all = regsets_fetch_inferior_registers (regs_info->regsets_info, regcache); |
5511 | if (regs_info->usrregs != NULL) | |
5512 | usr_fetch_inferior_registers (regs_info, regcache, -1, all); | |
1faeff08 MR |
5513 | } |
5514 | else | |
5515 | { | |
bd70b1f2 | 5516 | if (low_fetch_register (regcache, regno)) |
c14dfd32 PA |
5517 | return; |
5518 | ||
3aee8918 | 5519 | use_regsets = linux_register_in_regsets (regs_info, regno); |
1faeff08 | 5520 | if (use_regsets) |
3aee8918 PA |
5521 | all = regsets_fetch_inferior_registers (regs_info->regsets_info, |
5522 | regcache); | |
5523 | if ((!use_regsets || all) && regs_info->usrregs != NULL) | |
5524 | usr_fetch_inferior_registers (regs_info, regcache, regno, 1); | |
1faeff08 | 5525 | } |
58caa3dc DJ |
5526 | } |
5527 | ||
a5a4d4cd TBA |
5528 | void |
5529 | linux_process_target::store_registers (regcache *regcache, int regno) | |
58caa3dc | 5530 | { |
1faeff08 MR |
5531 | int use_regsets; |
5532 | int all = 0; | |
aa8d21c9 | 5533 | const regs_info *regs_info = get_regs_info (); |
1faeff08 MR |
5534 | |
5535 | if (regno == -1) | |
5536 | { | |
3aee8918 PA |
5537 | all = regsets_store_inferior_registers (regs_info->regsets_info, |
5538 | regcache); | |
5539 | if (regs_info->usrregs != NULL) | |
5540 | usr_store_inferior_registers (regs_info, regcache, regno, all); | |
1faeff08 MR |
5541 | } |
5542 | else | |
5543 | { | |
3aee8918 | 5544 | use_regsets = linux_register_in_regsets (regs_info, regno); |
1faeff08 | 5545 | if (use_regsets) |
3aee8918 PA |
5546 | all = regsets_store_inferior_registers (regs_info->regsets_info, |
5547 | regcache); | |
5548 | if ((!use_regsets || all) && regs_info->usrregs != NULL) | |
5549 | usr_store_inferior_registers (regs_info, regcache, regno, 1); | |
1faeff08 | 5550 | } |
58caa3dc DJ |
5551 | } |
5552 | ||
bd70b1f2 TBA |
5553 | bool |
5554 | linux_process_target::low_fetch_register (regcache *regcache, int regno) | |
5555 | { | |
5556 | return false; | |
5557 | } | |
da6d8c04 | 5558 | |
e2558df3 | 5559 | /* A wrapper for the read_memory target op. */ |
da6d8c04 | 5560 | |
c3e735a6 | 5561 | static int |
f450004a | 5562 | linux_read_memory (CORE_ADDR memaddr, unsigned char *myaddr, int len) |
e2558df3 | 5563 | { |
52405d85 | 5564 | return the_target->read_memory (memaddr, myaddr, len); |
e2558df3 TBA |
5565 | } |
5566 | ||
5567 | /* Copy LEN bytes from inferior's memory starting at MEMADDR | |
5568 | to debugger memory starting at MYADDR. */ | |
5569 | ||
5570 | int | |
5571 | linux_process_target::read_memory (CORE_ADDR memaddr, | |
5572 | unsigned char *myaddr, int len) | |
da6d8c04 | 5573 | { |
0bfdf32f | 5574 | int pid = lwpid_of (current_thread); |
ae3e2ccf SM |
5575 | PTRACE_XFER_TYPE *buffer; |
5576 | CORE_ADDR addr; | |
5577 | int count; | |
4934b29e | 5578 | char filename[64]; |
ae3e2ccf | 5579 | int i; |
4934b29e | 5580 | int ret; |
fd462a61 | 5581 | int fd; |
fd462a61 DJ |
5582 | |
5583 | /* Try using /proc. Don't bother for one word. */ | |
5584 | if (len >= 3 * sizeof (long)) | |
5585 | { | |
4934b29e MR |
5586 | int bytes; |
5587 | ||
fd462a61 DJ |
5588 | /* We could keep this file open and cache it - possibly one per |
5589 | thread. That requires some juggling, but is even faster. */ | |
95954743 | 5590 | sprintf (filename, "/proc/%d/mem", pid); |
fd462a61 DJ |
5591 | fd = open (filename, O_RDONLY | O_LARGEFILE); |
5592 | if (fd == -1) | |
5593 | goto no_proc; | |
5594 | ||
5595 | /* If pread64 is available, use it. It's faster if the kernel | |
5596 | supports it (only one syscall), and it's 64-bit safe even on | |
5597 | 32-bit platforms (for instance, SPARC debugging a SPARC64 | |
5598 | application). */ | |
5599 | #ifdef HAVE_PREAD64 | |
4934b29e | 5600 | bytes = pread64 (fd, myaddr, len, memaddr); |
fd462a61 | 5601 | #else |
4934b29e MR |
5602 | bytes = -1; |
5603 | if (lseek (fd, memaddr, SEEK_SET) != -1) | |
5604 | bytes = read (fd, myaddr, len); | |
fd462a61 | 5605 | #endif |
fd462a61 DJ |
5606 | |
5607 | close (fd); | |
4934b29e MR |
5608 | if (bytes == len) |
5609 | return 0; | |
5610 | ||
5611 | /* Some data was read, we'll try to get the rest with ptrace. */ | |
5612 | if (bytes > 0) | |
5613 | { | |
5614 | memaddr += bytes; | |
5615 | myaddr += bytes; | |
5616 | len -= bytes; | |
5617 | } | |
fd462a61 | 5618 | } |
da6d8c04 | 5619 | |
fd462a61 | 5620 | no_proc: |
4934b29e MR |
5621 | /* Round starting address down to longword boundary. */ |
5622 | addr = memaddr & -(CORE_ADDR) sizeof (PTRACE_XFER_TYPE); | |
5623 | /* Round ending address up; get number of longwords that makes. */ | |
5624 | count = ((((memaddr + len) - addr) + sizeof (PTRACE_XFER_TYPE) - 1) | |
5625 | / sizeof (PTRACE_XFER_TYPE)); | |
5626 | /* Allocate buffer of that many longwords. */ | |
8d749320 | 5627 | buffer = XALLOCAVEC (PTRACE_XFER_TYPE, count); |
4934b29e | 5628 | |
da6d8c04 | 5629 | /* Read all the longwords */ |
4934b29e | 5630 | errno = 0; |
da6d8c04 DJ |
5631 | for (i = 0; i < count; i++, addr += sizeof (PTRACE_XFER_TYPE)) |
5632 | { | |
14ce3065 DE |
5633 | /* Coerce the 3rd arg to a uintptr_t first to avoid potential gcc warning |
5634 | about coercing an 8 byte integer to a 4 byte pointer. */ | |
5635 | buffer[i] = ptrace (PTRACE_PEEKTEXT, pid, | |
b8e1b30e LM |
5636 | (PTRACE_TYPE_ARG3) (uintptr_t) addr, |
5637 | (PTRACE_TYPE_ARG4) 0); | |
c3e735a6 | 5638 | if (errno) |
4934b29e | 5639 | break; |
da6d8c04 | 5640 | } |
4934b29e | 5641 | ret = errno; |
da6d8c04 DJ |
5642 | |
5643 | /* Copy appropriate bytes out of the buffer. */ | |
8d409d16 MR |
5644 | if (i > 0) |
5645 | { | |
5646 | i *= sizeof (PTRACE_XFER_TYPE); | |
5647 | i -= memaddr & (sizeof (PTRACE_XFER_TYPE) - 1); | |
5648 | memcpy (myaddr, | |
5649 | (char *) buffer + (memaddr & (sizeof (PTRACE_XFER_TYPE) - 1)), | |
5650 | i < len ? i : len); | |
5651 | } | |
c3e735a6 | 5652 | |
4934b29e | 5653 | return ret; |
da6d8c04 DJ |
5654 | } |
5655 | ||
93ae6fdc PA |
5656 | /* Copy LEN bytes of data from debugger memory at MYADDR to inferior's |
5657 | memory at MEMADDR. On failure (cannot write to the inferior) | |
f0ae6fc3 | 5658 | returns the value of errno. Always succeeds if LEN is zero. */ |
da6d8c04 | 5659 | |
e2558df3 TBA |
5660 | int |
5661 | linux_process_target::write_memory (CORE_ADDR memaddr, | |
5662 | const unsigned char *myaddr, int len) | |
da6d8c04 | 5663 | { |
ae3e2ccf | 5664 | int i; |
da6d8c04 | 5665 | /* Round starting address down to longword boundary. */ |
ae3e2ccf | 5666 | CORE_ADDR addr = memaddr & -(CORE_ADDR) sizeof (PTRACE_XFER_TYPE); |
da6d8c04 | 5667 | /* Round ending address up; get number of longwords that makes. */ |
ae3e2ccf | 5668 | int count |
493e2a69 MS |
5669 | = (((memaddr + len) - addr) + sizeof (PTRACE_XFER_TYPE) - 1) |
5670 | / sizeof (PTRACE_XFER_TYPE); | |
5671 | ||
da6d8c04 | 5672 | /* Allocate buffer of that many longwords. */ |
ae3e2ccf | 5673 | PTRACE_XFER_TYPE *buffer = XALLOCAVEC (PTRACE_XFER_TYPE, count); |
493e2a69 | 5674 | |
0bfdf32f | 5675 | int pid = lwpid_of (current_thread); |
da6d8c04 | 5676 | |
f0ae6fc3 PA |
5677 | if (len == 0) |
5678 | { | |
5679 | /* Zero length write always succeeds. */ | |
5680 | return 0; | |
5681 | } | |
5682 | ||
0d62e5e8 DJ |
5683 | if (debug_threads) |
5684 | { | |
58d6951d | 5685 | /* Dump up to four bytes. */ |
bf47e248 PA |
5686 | char str[4 * 2 + 1]; |
5687 | char *p = str; | |
5688 | int dump = len < 4 ? len : 4; | |
5689 | ||
5690 | for (i = 0; i < dump; i++) | |
5691 | { | |
5692 | sprintf (p, "%02x", myaddr[i]); | |
5693 | p += 2; | |
5694 | } | |
5695 | *p = '\0'; | |
5696 | ||
5697 | debug_printf ("Writing %s to 0x%08lx in process %d\n", | |
5698 | str, (long) memaddr, pid); | |
0d62e5e8 DJ |
5699 | } |
5700 | ||
da6d8c04 DJ |
5701 | /* Fill start and end extra bytes of buffer with existing memory data. */ |
5702 | ||
93ae6fdc | 5703 | errno = 0; |
14ce3065 DE |
5704 | /* Coerce the 3rd arg to a uintptr_t first to avoid potential gcc warning |
5705 | about coercing an 8 byte integer to a 4 byte pointer. */ | |
5706 | buffer[0] = ptrace (PTRACE_PEEKTEXT, pid, | |
b8e1b30e LM |
5707 | (PTRACE_TYPE_ARG3) (uintptr_t) addr, |
5708 | (PTRACE_TYPE_ARG4) 0); | |
93ae6fdc PA |
5709 | if (errno) |
5710 | return errno; | |
da6d8c04 DJ |
5711 | |
5712 | if (count > 1) | |
5713 | { | |
93ae6fdc | 5714 | errno = 0; |
da6d8c04 | 5715 | buffer[count - 1] |
95954743 | 5716 | = ptrace (PTRACE_PEEKTEXT, pid, |
14ce3065 DE |
5717 | /* Coerce to a uintptr_t first to avoid potential gcc warning |
5718 | about coercing an 8 byte integer to a 4 byte pointer. */ | |
b8e1b30e | 5719 | (PTRACE_TYPE_ARG3) (uintptr_t) (addr + (count - 1) |
14ce3065 | 5720 | * sizeof (PTRACE_XFER_TYPE)), |
b8e1b30e | 5721 | (PTRACE_TYPE_ARG4) 0); |
93ae6fdc PA |
5722 | if (errno) |
5723 | return errno; | |
da6d8c04 DJ |
5724 | } |
5725 | ||
93ae6fdc | 5726 | /* Copy data to be written over corresponding part of buffer. */ |
da6d8c04 | 5727 | |
493e2a69 MS |
5728 | memcpy ((char *) buffer + (memaddr & (sizeof (PTRACE_XFER_TYPE) - 1)), |
5729 | myaddr, len); | |
da6d8c04 DJ |
5730 | |
5731 | /* Write the entire buffer. */ | |
5732 | ||
5733 | for (i = 0; i < count; i++, addr += sizeof (PTRACE_XFER_TYPE)) | |
5734 | { | |
5735 | errno = 0; | |
14ce3065 DE |
5736 | ptrace (PTRACE_POKETEXT, pid, |
5737 | /* Coerce to a uintptr_t first to avoid potential gcc warning | |
5738 | about coercing an 8 byte integer to a 4 byte pointer. */ | |
b8e1b30e LM |
5739 | (PTRACE_TYPE_ARG3) (uintptr_t) addr, |
5740 | (PTRACE_TYPE_ARG4) buffer[i]); | |
da6d8c04 DJ |
5741 | if (errno) |
5742 | return errno; | |
5743 | } | |
5744 | ||
5745 | return 0; | |
5746 | } | |
2f2893d9 | 5747 | |
2a31c7aa TBA |
5748 | void |
5749 | linux_process_target::look_up_symbols () | |
2f2893d9 | 5750 | { |
0d62e5e8 | 5751 | #ifdef USE_THREAD_DB |
95954743 PA |
5752 | struct process_info *proc = current_process (); |
5753 | ||
fe978cb0 | 5754 | if (proc->priv->thread_db != NULL) |
0d62e5e8 DJ |
5755 | return; |
5756 | ||
9b4c5f87 | 5757 | thread_db_init (); |
0d62e5e8 DJ |
5758 | #endif |
5759 | } | |
5760 | ||
eb497a2a TBA |
5761 | void |
5762 | linux_process_target::request_interrupt () | |
e5379b03 | 5763 | { |
78708b7c PA |
5764 | /* Send a SIGINT to the process group. This acts just like the user |
5765 | typed a ^C on the controlling terminal. */ | |
eb497a2a | 5766 | ::kill (-signal_pid, SIGINT); |
e5379b03 DJ |
5767 | } |
5768 | ||
eac215cc TBA |
5769 | bool |
5770 | linux_process_target::supports_read_auxv () | |
5771 | { | |
5772 | return true; | |
5773 | } | |
5774 | ||
aa691b87 RM |
5775 | /* Copy LEN bytes from inferior's auxiliary vector starting at OFFSET |
5776 | to debugger memory starting at MYADDR. */ | |
5777 | ||
eac215cc TBA |
5778 | int |
5779 | linux_process_target::read_auxv (CORE_ADDR offset, unsigned char *myaddr, | |
5780 | unsigned int len) | |
aa691b87 RM |
5781 | { |
5782 | char filename[PATH_MAX]; | |
5783 | int fd, n; | |
0bfdf32f | 5784 | int pid = lwpid_of (current_thread); |
aa691b87 | 5785 | |
6cebaf6e | 5786 | xsnprintf (filename, sizeof filename, "/proc/%d/auxv", pid); |
aa691b87 RM |
5787 | |
5788 | fd = open (filename, O_RDONLY); | |
5789 | if (fd < 0) | |
5790 | return -1; | |
5791 | ||
5792 | if (offset != (CORE_ADDR) 0 | |
5793 | && lseek (fd, (off_t) offset, SEEK_SET) != (off_t) offset) | |
5794 | n = -1; | |
5795 | else | |
5796 | n = read (fd, myaddr, len); | |
5797 | ||
5798 | close (fd); | |
5799 | ||
5800 | return n; | |
5801 | } | |
5802 | ||
7e0bde70 TBA |
5803 | int |
5804 | linux_process_target::insert_point (enum raw_bkpt_type type, CORE_ADDR addr, | |
5805 | int size, raw_breakpoint *bp) | |
e013ee27 | 5806 | { |
c8f4bfdd YQ |
5807 | if (type == raw_bkpt_type_sw) |
5808 | return insert_memory_breakpoint (bp); | |
e013ee27 | 5809 | else |
9db9aa23 TBA |
5810 | return low_insert_point (type, addr, size, bp); |
5811 | } | |
5812 | ||
5813 | int | |
5814 | linux_process_target::low_insert_point (raw_bkpt_type type, CORE_ADDR addr, | |
5815 | int size, raw_breakpoint *bp) | |
5816 | { | |
5817 | /* Unsupported (see target.h). */ | |
5818 | return 1; | |
e013ee27 OF |
5819 | } |
5820 | ||
7e0bde70 TBA |
5821 | int |
5822 | linux_process_target::remove_point (enum raw_bkpt_type type, CORE_ADDR addr, | |
5823 | int size, raw_breakpoint *bp) | |
e013ee27 | 5824 | { |
c8f4bfdd YQ |
5825 | if (type == raw_bkpt_type_sw) |
5826 | return remove_memory_breakpoint (bp); | |
e013ee27 | 5827 | else |
9db9aa23 TBA |
5828 | return low_remove_point (type, addr, size, bp); |
5829 | } | |
5830 | ||
5831 | int | |
5832 | linux_process_target::low_remove_point (raw_bkpt_type type, CORE_ADDR addr, | |
5833 | int size, raw_breakpoint *bp) | |
5834 | { | |
5835 | /* Unsupported (see target.h). */ | |
5836 | return 1; | |
e013ee27 OF |
5837 | } |
5838 | ||
84320c4e | 5839 | /* Implement the stopped_by_sw_breakpoint target_ops |
3e572f71 PA |
5840 | method. */ |
5841 | ||
84320c4e TBA |
5842 | bool |
5843 | linux_process_target::stopped_by_sw_breakpoint () | |
3e572f71 PA |
5844 | { |
5845 | struct lwp_info *lwp = get_thread_lwp (current_thread); | |
5846 | ||
5847 | return (lwp->stop_reason == TARGET_STOPPED_BY_SW_BREAKPOINT); | |
5848 | } | |
5849 | ||
84320c4e | 5850 | /* Implement the supports_stopped_by_sw_breakpoint target_ops |
3e572f71 PA |
5851 | method. */ |
5852 | ||
84320c4e TBA |
5853 | bool |
5854 | linux_process_target::supports_stopped_by_sw_breakpoint () | |
3e572f71 PA |
5855 | { |
5856 | return USE_SIGTRAP_SIGINFO; | |
5857 | } | |
5858 | ||
93fe88b2 | 5859 | /* Implement the stopped_by_hw_breakpoint target_ops |
3e572f71 PA |
5860 | method. */ |
5861 | ||
93fe88b2 TBA |
5862 | bool |
5863 | linux_process_target::stopped_by_hw_breakpoint () | |
3e572f71 PA |
5864 | { |
5865 | struct lwp_info *lwp = get_thread_lwp (current_thread); | |
5866 | ||
5867 | return (lwp->stop_reason == TARGET_STOPPED_BY_HW_BREAKPOINT); | |
5868 | } | |
5869 | ||
93fe88b2 | 5870 | /* Implement the supports_stopped_by_hw_breakpoint target_ops |
3e572f71 PA |
5871 | method. */ |
5872 | ||
93fe88b2 TBA |
5873 | bool |
5874 | linux_process_target::supports_stopped_by_hw_breakpoint () | |
3e572f71 PA |
5875 | { |
5876 | return USE_SIGTRAP_SIGINFO; | |
5877 | } | |
5878 | ||
70b90b91 | 5879 | /* Implement the supports_hardware_single_step target_ops method. */ |
45614f15 | 5880 | |
22aa6223 TBA |
5881 | bool |
5882 | linux_process_target::supports_hardware_single_step () | |
45614f15 | 5883 | { |
b31cdfa6 | 5884 | return true; |
45614f15 YQ |
5885 | } |
5886 | ||
6eeb5c55 TBA |
5887 | bool |
5888 | linux_process_target::stopped_by_watchpoint () | |
e013ee27 | 5889 | { |
0bfdf32f | 5890 | struct lwp_info *lwp = get_thread_lwp (current_thread); |
c3adc08c | 5891 | |
15c66dd6 | 5892 | return lwp->stop_reason == TARGET_STOPPED_BY_WATCHPOINT; |
e013ee27 OF |
5893 | } |
5894 | ||
6eeb5c55 TBA |
5895 | CORE_ADDR |
5896 | linux_process_target::stopped_data_address () | |
e013ee27 | 5897 | { |
0bfdf32f | 5898 | struct lwp_info *lwp = get_thread_lwp (current_thread); |
c3adc08c PA |
5899 | |
5900 | return lwp->stopped_data_address; | |
e013ee27 OF |
5901 | } |
5902 | ||
db0dfaa0 LM |
5903 | /* This is only used for targets that define PT_TEXT_ADDR, |
5904 | PT_DATA_ADDR and PT_TEXT_END_ADDR. If those are not defined, supposedly | |
5905 | the target has different ways of acquiring this information, like | |
5906 | loadmaps. */ | |
52fb6437 | 5907 | |
5203ae1e TBA |
5908 | bool |
5909 | linux_process_target::supports_read_offsets () | |
5910 | { | |
5911 | #ifdef SUPPORTS_READ_OFFSETS | |
5912 | return true; | |
5913 | #else | |
5914 | return false; | |
5915 | #endif | |
5916 | } | |
5917 | ||
52fb6437 NS |
5918 | /* Under uClinux, programs are loaded at non-zero offsets, which we need |
5919 | to tell gdb about. */ | |
5920 | ||
5203ae1e TBA |
5921 | int |
5922 | linux_process_target::read_offsets (CORE_ADDR *text_p, CORE_ADDR *data_p) | |
52fb6437 | 5923 | { |
5203ae1e | 5924 | #ifdef SUPPORTS_READ_OFFSETS |
52fb6437 | 5925 | unsigned long text, text_end, data; |
62828379 | 5926 | int pid = lwpid_of (current_thread); |
52fb6437 NS |
5927 | |
5928 | errno = 0; | |
5929 | ||
b8e1b30e LM |
5930 | text = ptrace (PTRACE_PEEKUSER, pid, (PTRACE_TYPE_ARG3) PT_TEXT_ADDR, |
5931 | (PTRACE_TYPE_ARG4) 0); | |
5932 | text_end = ptrace (PTRACE_PEEKUSER, pid, (PTRACE_TYPE_ARG3) PT_TEXT_END_ADDR, | |
5933 | (PTRACE_TYPE_ARG4) 0); | |
5934 | data = ptrace (PTRACE_PEEKUSER, pid, (PTRACE_TYPE_ARG3) PT_DATA_ADDR, | |
5935 | (PTRACE_TYPE_ARG4) 0); | |
52fb6437 NS |
5936 | |
5937 | if (errno == 0) | |
5938 | { | |
5939 | /* Both text and data offsets produced at compile-time (and so | |
1b3f6016 PA |
5940 | used by gdb) are relative to the beginning of the program, |
5941 | with the data segment immediately following the text segment. | |
5942 | However, the actual runtime layout in memory may put the data | |
5943 | somewhere else, so when we send gdb a data base-address, we | |
5944 | use the real data base address and subtract the compile-time | |
5945 | data base-address from it (which is just the length of the | |
5946 | text segment). BSS immediately follows data in both | |
5947 | cases. */ | |
52fb6437 NS |
5948 | *text_p = text; |
5949 | *data_p = data - (text_end - text); | |
1b3f6016 | 5950 | |
52fb6437 NS |
5951 | return 1; |
5952 | } | |
5203ae1e TBA |
5953 | return 0; |
5954 | #else | |
5955 | gdb_assert_not_reached ("target op read_offsets not supported"); | |
52fb6437 | 5956 | #endif |
5203ae1e | 5957 | } |
52fb6437 | 5958 | |
6e3fd7e9 TBA |
5959 | bool |
5960 | linux_process_target::supports_get_tls_address () | |
5961 | { | |
5962 | #ifdef USE_THREAD_DB | |
5963 | return true; | |
5964 | #else | |
5965 | return false; | |
5966 | #endif | |
5967 | } | |
5968 | ||
5969 | int | |
5970 | linux_process_target::get_tls_address (thread_info *thread, | |
5971 | CORE_ADDR offset, | |
5972 | CORE_ADDR load_module, | |
5973 | CORE_ADDR *address) | |
5974 | { | |
5975 | #ifdef USE_THREAD_DB | |
5976 | return thread_db_get_tls_address (thread, offset, load_module, address); | |
5977 | #else | |
5978 | return -1; | |
5979 | #endif | |
5980 | } | |
5981 | ||
2d0795ee TBA |
5982 | bool |
5983 | linux_process_target::supports_qxfer_osdata () | |
5984 | { | |
5985 | return true; | |
5986 | } | |
5987 | ||
5988 | int | |
5989 | linux_process_target::qxfer_osdata (const char *annex, | |
5990 | unsigned char *readbuf, | |
5991 | unsigned const char *writebuf, | |
5992 | CORE_ADDR offset, int len) | |
07e059b5 | 5993 | { |
d26e3629 | 5994 | return linux_common_xfer_osdata (annex, readbuf, offset, len); |
07e059b5 VP |
5995 | } |
5996 | ||
cb63de7c TBA |
5997 | void |
5998 | linux_process_target::siginfo_fixup (siginfo_t *siginfo, | |
5999 | gdb_byte *inf_siginfo, int direction) | |
d0722149 | 6000 | { |
cb63de7c | 6001 | bool done = low_siginfo_fixup (siginfo, inf_siginfo, direction); |
d0722149 DE |
6002 | |
6003 | /* If there was no callback, or the callback didn't do anything, | |
6004 | then just do a straight memcpy. */ | |
6005 | if (!done) | |
6006 | { | |
6007 | if (direction == 1) | |
a5362b9a | 6008 | memcpy (siginfo, inf_siginfo, sizeof (siginfo_t)); |
d0722149 | 6009 | else |
a5362b9a | 6010 | memcpy (inf_siginfo, siginfo, sizeof (siginfo_t)); |
d0722149 DE |
6011 | } |
6012 | } | |
6013 | ||
cb63de7c TBA |
6014 | bool |
6015 | linux_process_target::low_siginfo_fixup (siginfo_t *native, gdb_byte *inf, | |
6016 | int direction) | |
6017 | { | |
6018 | return false; | |
6019 | } | |
6020 | ||
d7abedf7 TBA |
6021 | bool |
6022 | linux_process_target::supports_qxfer_siginfo () | |
6023 | { | |
6024 | return true; | |
6025 | } | |
6026 | ||
6027 | int | |
6028 | linux_process_target::qxfer_siginfo (const char *annex, | |
6029 | unsigned char *readbuf, | |
6030 | unsigned const char *writebuf, | |
6031 | CORE_ADDR offset, int len) | |
4aa995e1 | 6032 | { |
d0722149 | 6033 | int pid; |
a5362b9a | 6034 | siginfo_t siginfo; |
8adce034 | 6035 | gdb_byte inf_siginfo[sizeof (siginfo_t)]; |
4aa995e1 | 6036 | |
0bfdf32f | 6037 | if (current_thread == NULL) |
4aa995e1 PA |
6038 | return -1; |
6039 | ||
0bfdf32f | 6040 | pid = lwpid_of (current_thread); |
4aa995e1 PA |
6041 | |
6042 | if (debug_threads) | |
87ce2a04 DE |
6043 | debug_printf ("%s siginfo for lwp %d.\n", |
6044 | readbuf != NULL ? "Reading" : "Writing", | |
6045 | pid); | |
4aa995e1 | 6046 | |
0adea5f7 | 6047 | if (offset >= sizeof (siginfo)) |
4aa995e1 PA |
6048 | return -1; |
6049 | ||
b8e1b30e | 6050 | if (ptrace (PTRACE_GETSIGINFO, pid, (PTRACE_TYPE_ARG3) 0, &siginfo) != 0) |
4aa995e1 PA |
6051 | return -1; |
6052 | ||
d0722149 DE |
6053 | /* When GDBSERVER is built as a 64-bit application, ptrace writes into |
6054 | SIGINFO an object with 64-bit layout. Since debugging a 32-bit | |
6055 | inferior with a 64-bit GDBSERVER should look the same as debugging it | |
6056 | with a 32-bit GDBSERVER, we need to convert it. */ | |
6057 | siginfo_fixup (&siginfo, inf_siginfo, 0); | |
6058 | ||
4aa995e1 PA |
6059 | if (offset + len > sizeof (siginfo)) |
6060 | len = sizeof (siginfo) - offset; | |
6061 | ||
6062 | if (readbuf != NULL) | |
d0722149 | 6063 | memcpy (readbuf, inf_siginfo + offset, len); |
4aa995e1 PA |
6064 | else |
6065 | { | |
d0722149 DE |
6066 | memcpy (inf_siginfo + offset, writebuf, len); |
6067 | ||
6068 | /* Convert back to ptrace layout before flushing it out. */ | |
6069 | siginfo_fixup (&siginfo, inf_siginfo, 1); | |
6070 | ||
b8e1b30e | 6071 | if (ptrace (PTRACE_SETSIGINFO, pid, (PTRACE_TYPE_ARG3) 0, &siginfo) != 0) |
4aa995e1 PA |
6072 | return -1; |
6073 | } | |
6074 | ||
6075 | return len; | |
6076 | } | |
6077 | ||
bd99dc85 PA |
6078 | /* SIGCHLD handler that serves two purposes: In non-stop/async mode, |
6079 | so we notice when children change state; as the handler for the | |
6080 | sigsuspend in my_waitpid. */ | |
6081 | ||
6082 | static void | |
6083 | sigchld_handler (int signo) | |
6084 | { | |
6085 | int old_errno = errno; | |
6086 | ||
6087 | if (debug_threads) | |
e581f2b4 PA |
6088 | { |
6089 | do | |
6090 | { | |
a7e559cc AH |
6091 | /* Use the async signal safe debug function. */ |
6092 | if (debug_write ("sigchld_handler\n", | |
6093 | sizeof ("sigchld_handler\n") - 1) < 0) | |
e581f2b4 PA |
6094 | break; /* just ignore */ |
6095 | } while (0); | |
6096 | } | |
bd99dc85 PA |
6097 | |
6098 | if (target_is_async_p ()) | |
6099 | async_file_mark (); /* trigger a linux_wait */ | |
6100 | ||
6101 | errno = old_errno; | |
6102 | } | |
6103 | ||
0dc587d4 TBA |
6104 | bool |
6105 | linux_process_target::supports_non_stop () | |
bd99dc85 | 6106 | { |
0dc587d4 | 6107 | return true; |
bd99dc85 PA |
6108 | } |
6109 | ||
0dc587d4 TBA |
6110 | bool |
6111 | linux_process_target::async (bool enable) | |
bd99dc85 | 6112 | { |
0dc587d4 | 6113 | bool previous = target_is_async_p (); |
bd99dc85 | 6114 | |
8336d594 | 6115 | if (debug_threads) |
87ce2a04 DE |
6116 | debug_printf ("linux_async (%d), previous=%d\n", |
6117 | enable, previous); | |
8336d594 | 6118 | |
bd99dc85 PA |
6119 | if (previous != enable) |
6120 | { | |
6121 | sigset_t mask; | |
6122 | sigemptyset (&mask); | |
6123 | sigaddset (&mask, SIGCHLD); | |
6124 | ||
21987b9c | 6125 | gdb_sigmask (SIG_BLOCK, &mask, NULL); |
bd99dc85 PA |
6126 | |
6127 | if (enable) | |
6128 | { | |
6129 | if (pipe (linux_event_pipe) == -1) | |
aa96c426 GB |
6130 | { |
6131 | linux_event_pipe[0] = -1; | |
6132 | linux_event_pipe[1] = -1; | |
21987b9c | 6133 | gdb_sigmask (SIG_UNBLOCK, &mask, NULL); |
aa96c426 GB |
6134 | |
6135 | warning ("creating event pipe failed."); | |
6136 | return previous; | |
6137 | } | |
bd99dc85 PA |
6138 | |
6139 | fcntl (linux_event_pipe[0], F_SETFL, O_NONBLOCK); | |
6140 | fcntl (linux_event_pipe[1], F_SETFL, O_NONBLOCK); | |
6141 | ||
6142 | /* Register the event loop handler. */ | |
6143 | add_file_handler (linux_event_pipe[0], | |
6144 | handle_target_event, NULL); | |
6145 | ||
6146 | /* Always trigger a linux_wait. */ | |
6147 | async_file_mark (); | |
6148 | } | |
6149 | else | |
6150 | { | |
6151 | delete_file_handler (linux_event_pipe[0]); | |
6152 | ||
6153 | close (linux_event_pipe[0]); | |
6154 | close (linux_event_pipe[1]); | |
6155 | linux_event_pipe[0] = -1; | |
6156 | linux_event_pipe[1] = -1; | |
6157 | } | |
6158 | ||
21987b9c | 6159 | gdb_sigmask (SIG_UNBLOCK, &mask, NULL); |
bd99dc85 PA |
6160 | } |
6161 | ||
6162 | return previous; | |
6163 | } | |
6164 | ||
0dc587d4 TBA |
6165 | int |
6166 | linux_process_target::start_non_stop (bool nonstop) | |
bd99dc85 PA |
6167 | { |
6168 | /* Register or unregister from event-loop accordingly. */ | |
0dc587d4 | 6169 | target_async (nonstop); |
aa96c426 | 6170 | |
0dc587d4 | 6171 | if (target_is_async_p () != (nonstop != false)) |
aa96c426 GB |
6172 | return -1; |
6173 | ||
bd99dc85 PA |
6174 | return 0; |
6175 | } | |
6176 | ||
652aef77 TBA |
6177 | bool |
6178 | linux_process_target::supports_multi_process () | |
cf8fd78b | 6179 | { |
652aef77 | 6180 | return true; |
cf8fd78b PA |
6181 | } |
6182 | ||
89245bc0 DB |
6183 | /* Check if fork events are supported. */ |
6184 | ||
9690a72a TBA |
6185 | bool |
6186 | linux_process_target::supports_fork_events () | |
89245bc0 DB |
6187 | { |
6188 | return linux_supports_tracefork (); | |
6189 | } | |
6190 | ||
6191 | /* Check if vfork events are supported. */ | |
6192 | ||
9690a72a TBA |
6193 | bool |
6194 | linux_process_target::supports_vfork_events () | |
89245bc0 DB |
6195 | { |
6196 | return linux_supports_tracefork (); | |
6197 | } | |
6198 | ||
94585166 DB |
6199 | /* Check if exec events are supported. */ |
6200 | ||
9690a72a TBA |
6201 | bool |
6202 | linux_process_target::supports_exec_events () | |
94585166 DB |
6203 | { |
6204 | return linux_supports_traceexec (); | |
6205 | } | |
6206 | ||
de0d863e DB |
6207 | /* Target hook for 'handle_new_gdb_connection'. Causes a reset of the |
6208 | ptrace flags for all inferiors. This is in case the new GDB connection | |
6209 | doesn't support the same set of events that the previous one did. */ | |
6210 | ||
fb00dfce TBA |
6211 | void |
6212 | linux_process_target::handle_new_gdb_connection () | |
de0d863e | 6213 | { |
de0d863e | 6214 | /* Request that all the lwps reset their ptrace options. */ |
bbf550d5 SM |
6215 | for_each_thread ([] (thread_info *thread) |
6216 | { | |
6217 | struct lwp_info *lwp = get_thread_lwp (thread); | |
6218 | ||
6219 | if (!lwp->stopped) | |
6220 | { | |
6221 | /* Stop the lwp so we can modify its ptrace options. */ | |
6222 | lwp->must_set_ptrace_flags = 1; | |
6223 | linux_stop_lwp (lwp); | |
6224 | } | |
6225 | else | |
6226 | { | |
6227 | /* Already stopped; go ahead and set the ptrace options. */ | |
6228 | struct process_info *proc = find_process_pid (pid_of (thread)); | |
6229 | int options = linux_low_ptrace_options (proc->attached); | |
6230 | ||
6231 | linux_enable_event_reporting (lwpid_of (thread), options); | |
6232 | lwp->must_set_ptrace_flags = 0; | |
6233 | } | |
6234 | }); | |
de0d863e DB |
6235 | } |
6236 | ||
55cf3021 TBA |
6237 | int |
6238 | linux_process_target::handle_monitor_command (char *mon) | |
6239 | { | |
6240 | #ifdef USE_THREAD_DB | |
6241 | return thread_db_handle_monitor_command (mon); | |
6242 | #else | |
6243 | return 0; | |
6244 | #endif | |
6245 | } | |
6246 | ||
95a45fc1 TBA |
6247 | int |
6248 | linux_process_target::core_of_thread (ptid_t ptid) | |
6249 | { | |
6250 | return linux_common_core_of_thread (ptid); | |
6251 | } | |
6252 | ||
c756403b TBA |
6253 | bool |
6254 | linux_process_target::supports_disable_randomization () | |
03583c20 UW |
6255 | { |
6256 | #ifdef HAVE_PERSONALITY | |
c756403b | 6257 | return true; |
03583c20 | 6258 | #else |
c756403b | 6259 | return false; |
03583c20 UW |
6260 | #endif |
6261 | } | |
efcbbd14 | 6262 | |
c0245cb9 TBA |
6263 | bool |
6264 | linux_process_target::supports_agent () | |
d1feda86 | 6265 | { |
c0245cb9 | 6266 | return true; |
d1feda86 YQ |
6267 | } |
6268 | ||
2526e0cd TBA |
6269 | bool |
6270 | linux_process_target::supports_range_stepping () | |
c2d6af84 | 6271 | { |
7582c77c | 6272 | if (supports_software_single_step ()) |
2526e0cd | 6273 | return true; |
c2d6af84 | 6274 | |
9cfd8715 TBA |
6275 | return low_supports_range_stepping (); |
6276 | } | |
6277 | ||
6278 | bool | |
6279 | linux_process_target::low_supports_range_stepping () | |
6280 | { | |
6281 | return false; | |
c2d6af84 PA |
6282 | } |
6283 | ||
8247b823 TBA |
6284 | bool |
6285 | linux_process_target::supports_pid_to_exec_file () | |
6286 | { | |
6287 | return true; | |
6288 | } | |
6289 | ||
6290 | char * | |
6291 | linux_process_target::pid_to_exec_file (int pid) | |
6292 | { | |
6293 | return linux_proc_pid_to_exec_file (pid); | |
6294 | } | |
6295 | ||
c9b7b804 TBA |
6296 | bool |
6297 | linux_process_target::supports_multifs () | |
6298 | { | |
6299 | return true; | |
6300 | } | |
6301 | ||
6302 | int | |
6303 | linux_process_target::multifs_open (int pid, const char *filename, | |
6304 | int flags, mode_t mode) | |
6305 | { | |
6306 | return linux_mntns_open_cloexec (pid, filename, flags, mode); | |
6307 | } | |
6308 | ||
6309 | int | |
6310 | linux_process_target::multifs_unlink (int pid, const char *filename) | |
6311 | { | |
6312 | return linux_mntns_unlink (pid, filename); | |
6313 | } | |
6314 | ||
6315 | ssize_t | |
6316 | linux_process_target::multifs_readlink (int pid, const char *filename, | |
6317 | char *buf, size_t bufsiz) | |
6318 | { | |
6319 | return linux_mntns_readlink (pid, filename, buf, bufsiz); | |
6320 | } | |
6321 | ||
723b724b | 6322 | #if defined PT_GETDSBT || defined PTRACE_GETFDPIC |
78d85199 YQ |
6323 | struct target_loadseg |
6324 | { | |
6325 | /* Core address to which the segment is mapped. */ | |
6326 | Elf32_Addr addr; | |
6327 | /* VMA recorded in the program header. */ | |
6328 | Elf32_Addr p_vaddr; | |
6329 | /* Size of this segment in memory. */ | |
6330 | Elf32_Word p_memsz; | |
6331 | }; | |
6332 | ||
723b724b | 6333 | # if defined PT_GETDSBT |
78d85199 YQ |
6334 | struct target_loadmap |
6335 | { | |
6336 | /* Protocol version number, must be zero. */ | |
6337 | Elf32_Word version; | |
6338 | /* Pointer to the DSBT table, its size, and the DSBT index. */ | |
6339 | unsigned *dsbt_table; | |
6340 | unsigned dsbt_size, dsbt_index; | |
6341 | /* Number of segments in this map. */ | |
6342 | Elf32_Word nsegs; | |
6343 | /* The actual memory map. */ | |
6344 | struct target_loadseg segs[/*nsegs*/]; | |
6345 | }; | |
723b724b MF |
6346 | # define LINUX_LOADMAP PT_GETDSBT |
6347 | # define LINUX_LOADMAP_EXEC PTRACE_GETDSBT_EXEC | |
6348 | # define LINUX_LOADMAP_INTERP PTRACE_GETDSBT_INTERP | |
6349 | # else | |
6350 | struct target_loadmap | |
6351 | { | |
6352 | /* Protocol version number, must be zero. */ | |
6353 | Elf32_Half version; | |
6354 | /* Number of segments in this map. */ | |
6355 | Elf32_Half nsegs; | |
6356 | /* The actual memory map. */ | |
6357 | struct target_loadseg segs[/*nsegs*/]; | |
6358 | }; | |
6359 | # define LINUX_LOADMAP PTRACE_GETFDPIC | |
6360 | # define LINUX_LOADMAP_EXEC PTRACE_GETFDPIC_EXEC | |
6361 | # define LINUX_LOADMAP_INTERP PTRACE_GETFDPIC_INTERP | |
6362 | # endif | |
78d85199 | 6363 | |
9da41fda TBA |
6364 | bool |
6365 | linux_process_target::supports_read_loadmap () | |
6366 | { | |
6367 | return true; | |
6368 | } | |
6369 | ||
6370 | int | |
6371 | linux_process_target::read_loadmap (const char *annex, CORE_ADDR offset, | |
6372 | unsigned char *myaddr, unsigned int len) | |
78d85199 | 6373 | { |
0bfdf32f | 6374 | int pid = lwpid_of (current_thread); |
78d85199 YQ |
6375 | int addr = -1; |
6376 | struct target_loadmap *data = NULL; | |
6377 | unsigned int actual_length, copy_length; | |
6378 | ||
6379 | if (strcmp (annex, "exec") == 0) | |
723b724b | 6380 | addr = (int) LINUX_LOADMAP_EXEC; |
78d85199 | 6381 | else if (strcmp (annex, "interp") == 0) |
723b724b | 6382 | addr = (int) LINUX_LOADMAP_INTERP; |
78d85199 YQ |
6383 | else |
6384 | return -1; | |
6385 | ||
723b724b | 6386 | if (ptrace (LINUX_LOADMAP, pid, addr, &data) != 0) |
78d85199 YQ |
6387 | return -1; |
6388 | ||
6389 | if (data == NULL) | |
6390 | return -1; | |
6391 | ||
6392 | actual_length = sizeof (struct target_loadmap) | |
6393 | + sizeof (struct target_loadseg) * data->nsegs; | |
6394 | ||
6395 | if (offset < 0 || offset > actual_length) | |
6396 | return -1; | |
6397 | ||
6398 | copy_length = actual_length - offset < len ? actual_length - offset : len; | |
6399 | memcpy (myaddr, (char *) data + offset, copy_length); | |
6400 | return copy_length; | |
6401 | } | |
723b724b | 6402 | #endif /* defined PT_GETDSBT || defined PTRACE_GETFDPIC */ |
78d85199 | 6403 | |
bc8d3ae4 TBA |
6404 | bool |
6405 | linux_process_target::supports_catch_syscall () | |
82075af2 JS |
6406 | { |
6407 | return (the_low_target.get_syscall_trapinfo != NULL | |
6408 | && linux_supports_tracesysgood ()); | |
6409 | } | |
6410 | ||
d633e831 TBA |
6411 | int |
6412 | linux_process_target::get_ipa_tdesc_idx () | |
ae91f625 MK |
6413 | { |
6414 | if (the_low_target.get_ipa_tdesc_idx == NULL) | |
6415 | return 0; | |
6416 | ||
6417 | return (*the_low_target.get_ipa_tdesc_idx) (); | |
6418 | } | |
6419 | ||
770d8f6a TBA |
6420 | CORE_ADDR |
6421 | linux_process_target::read_pc (regcache *regcache) | |
219f2f23 | 6422 | { |
bf9ae9d8 | 6423 | if (!low_supports_breakpoints ()) |
219f2f23 PA |
6424 | return 0; |
6425 | ||
bf9ae9d8 | 6426 | return low_get_pc (regcache); |
219f2f23 PA |
6427 | } |
6428 | ||
770d8f6a TBA |
6429 | void |
6430 | linux_process_target::write_pc (regcache *regcache, CORE_ADDR pc) | |
219f2f23 | 6431 | { |
bf9ae9d8 | 6432 | gdb_assert (low_supports_breakpoints ()); |
219f2f23 | 6433 | |
bf9ae9d8 | 6434 | low_set_pc (regcache, pc); |
219f2f23 PA |
6435 | } |
6436 | ||
68119632 TBA |
6437 | bool |
6438 | linux_process_target::supports_thread_stopped () | |
6439 | { | |
6440 | return true; | |
6441 | } | |
6442 | ||
6443 | bool | |
6444 | linux_process_target::thread_stopped (thread_info *thread) | |
8336d594 PA |
6445 | { |
6446 | return get_thread_lwp (thread)->stopped; | |
6447 | } | |
6448 | ||
6449 | /* This exposes stop-all-threads functionality to other modules. */ | |
6450 | ||
29e8dc09 TBA |
6451 | void |
6452 | linux_process_target::pause_all (bool freeze) | |
8336d594 | 6453 | { |
7984d532 PA |
6454 | stop_all_lwps (freeze, NULL); |
6455 | } | |
6456 | ||
6457 | /* This exposes unstop-all-threads functionality to other gdbserver | |
6458 | modules. */ | |
6459 | ||
29e8dc09 TBA |
6460 | void |
6461 | linux_process_target::unpause_all (bool unfreeze) | |
7984d532 PA |
6462 | { |
6463 | unstop_all_lwps (unfreeze, NULL); | |
8336d594 PA |
6464 | } |
6465 | ||
79b44087 TBA |
6466 | int |
6467 | linux_process_target::prepare_to_access_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_pause_all (true); |
90d74c30 PA |
6473 | return 0; |
6474 | } | |
6475 | ||
79b44087 TBA |
6476 | void |
6477 | linux_process_target::done_accessing_memory () | |
90d74c30 PA |
6478 | { |
6479 | /* Neither ptrace nor /proc/PID/mem allow accessing memory through a | |
6480 | running LWP. */ | |
6481 | if (non_stop) | |
29e8dc09 | 6482 | target_unpause_all (true); |
90d74c30 PA |
6483 | } |
6484 | ||
2268b414 JK |
6485 | /* Extract &phdr and num_phdr in the inferior. Return 0 on success. */ |
6486 | ||
6487 | static int | |
6488 | get_phdr_phnum_from_proc_auxv (const int pid, const int is_elf64, | |
6489 | CORE_ADDR *phdr_memaddr, int *num_phdr) | |
6490 | { | |
6491 | char filename[PATH_MAX]; | |
6492 | int fd; | |
6493 | const int auxv_size = is_elf64 | |
6494 | ? sizeof (Elf64_auxv_t) : sizeof (Elf32_auxv_t); | |
6495 | char buf[sizeof (Elf64_auxv_t)]; /* The larger of the two. */ | |
6496 | ||
6497 | xsnprintf (filename, sizeof filename, "/proc/%d/auxv", pid); | |
6498 | ||
6499 | fd = open (filename, O_RDONLY); | |
6500 | if (fd < 0) | |
6501 | return 1; | |
6502 | ||
6503 | *phdr_memaddr = 0; | |
6504 | *num_phdr = 0; | |
6505 | while (read (fd, buf, auxv_size) == auxv_size | |
6506 | && (*phdr_memaddr == 0 || *num_phdr == 0)) | |
6507 | { | |
6508 | if (is_elf64) | |
6509 | { | |
6510 | Elf64_auxv_t *const aux = (Elf64_auxv_t *) buf; | |
6511 | ||
6512 | switch (aux->a_type) | |
6513 | { | |
6514 | case AT_PHDR: | |
6515 | *phdr_memaddr = aux->a_un.a_val; | |
6516 | break; | |
6517 | case AT_PHNUM: | |
6518 | *num_phdr = aux->a_un.a_val; | |
6519 | break; | |
6520 | } | |
6521 | } | |
6522 | else | |
6523 | { | |
6524 | Elf32_auxv_t *const aux = (Elf32_auxv_t *) buf; | |
6525 | ||
6526 | switch (aux->a_type) | |
6527 | { | |
6528 | case AT_PHDR: | |
6529 | *phdr_memaddr = aux->a_un.a_val; | |
6530 | break; | |
6531 | case AT_PHNUM: | |
6532 | *num_phdr = aux->a_un.a_val; | |
6533 | break; | |
6534 | } | |
6535 | } | |
6536 | } | |
6537 | ||
6538 | close (fd); | |
6539 | ||
6540 | if (*phdr_memaddr == 0 || *num_phdr == 0) | |
6541 | { | |
6542 | warning ("Unexpected missing AT_PHDR and/or AT_PHNUM: " | |
6543 | "phdr_memaddr = %ld, phdr_num = %d", | |
6544 | (long) *phdr_memaddr, *num_phdr); | |
6545 | return 2; | |
6546 | } | |
6547 | ||
6548 | return 0; | |
6549 | } | |
6550 | ||
6551 | /* Return &_DYNAMIC (via PT_DYNAMIC) in the inferior, or 0 if not present. */ | |
6552 | ||
6553 | static CORE_ADDR | |
6554 | get_dynamic (const int pid, const int is_elf64) | |
6555 | { | |
6556 | CORE_ADDR phdr_memaddr, relocation; | |
db1ff28b | 6557 | int num_phdr, i; |
2268b414 | 6558 | unsigned char *phdr_buf; |
db1ff28b | 6559 | const int phdr_size = is_elf64 ? sizeof (Elf64_Phdr) : sizeof (Elf32_Phdr); |
2268b414 JK |
6560 | |
6561 | if (get_phdr_phnum_from_proc_auxv (pid, is_elf64, &phdr_memaddr, &num_phdr)) | |
6562 | return 0; | |
6563 | ||
6564 | gdb_assert (num_phdr < 100); /* Basic sanity check. */ | |
224c3ddb | 6565 | phdr_buf = (unsigned char *) alloca (num_phdr * phdr_size); |
2268b414 JK |
6566 | |
6567 | if (linux_read_memory (phdr_memaddr, phdr_buf, num_phdr * phdr_size)) | |
6568 | return 0; | |
6569 | ||
6570 | /* Compute relocation: it is expected to be 0 for "regular" executables, | |
6571 | non-zero for PIE ones. */ | |
6572 | relocation = -1; | |
db1ff28b JK |
6573 | for (i = 0; relocation == -1 && i < num_phdr; i++) |
6574 | if (is_elf64) | |
6575 | { | |
6576 | Elf64_Phdr *const p = (Elf64_Phdr *) (phdr_buf + i * phdr_size); | |
6577 | ||
6578 | if (p->p_type == PT_PHDR) | |
6579 | relocation = phdr_memaddr - p->p_vaddr; | |
6580 | } | |
6581 | else | |
6582 | { | |
6583 | Elf32_Phdr *const p = (Elf32_Phdr *) (phdr_buf + i * phdr_size); | |
6584 | ||
6585 | if (p->p_type == PT_PHDR) | |
6586 | relocation = phdr_memaddr - p->p_vaddr; | |
6587 | } | |
6588 | ||
2268b414 JK |
6589 | if (relocation == -1) |
6590 | { | |
e237a7e2 JK |
6591 | /* PT_PHDR is optional, but necessary for PIE in general. Fortunately |
6592 | any real world executables, including PIE executables, have always | |
6593 | PT_PHDR present. PT_PHDR is not present in some shared libraries or | |
6594 | in fpc (Free Pascal 2.4) binaries but neither of those have a need for | |
6595 | or present DT_DEBUG anyway (fpc binaries are statically linked). | |
6596 | ||
6597 | Therefore if there exists DT_DEBUG there is always also PT_PHDR. | |
6598 | ||
6599 | GDB could find RELOCATION also from AT_ENTRY - e_entry. */ | |
6600 | ||
2268b414 JK |
6601 | return 0; |
6602 | } | |
6603 | ||
db1ff28b JK |
6604 | for (i = 0; i < num_phdr; i++) |
6605 | { | |
6606 | if (is_elf64) | |
6607 | { | |
6608 | Elf64_Phdr *const p = (Elf64_Phdr *) (phdr_buf + i * phdr_size); | |
6609 | ||
6610 | if (p->p_type == PT_DYNAMIC) | |
6611 | return p->p_vaddr + relocation; | |
6612 | } | |
6613 | else | |
6614 | { | |
6615 | Elf32_Phdr *const p = (Elf32_Phdr *) (phdr_buf + i * phdr_size); | |
2268b414 | 6616 | |
db1ff28b JK |
6617 | if (p->p_type == PT_DYNAMIC) |
6618 | return p->p_vaddr + relocation; | |
6619 | } | |
6620 | } | |
2268b414 JK |
6621 | |
6622 | return 0; | |
6623 | } | |
6624 | ||
6625 | /* Return &_r_debug in the inferior, or -1 if not present. Return value | |
367ba2c2 MR |
6626 | can be 0 if the inferior does not yet have the library list initialized. |
6627 | We look for DT_MIPS_RLD_MAP first. MIPS executables use this instead of | |
6628 | DT_DEBUG, although they sometimes contain an unused DT_DEBUG entry too. */ | |
2268b414 JK |
6629 | |
6630 | static CORE_ADDR | |
6631 | get_r_debug (const int pid, const int is_elf64) | |
6632 | { | |
6633 | CORE_ADDR dynamic_memaddr; | |
6634 | const int dyn_size = is_elf64 ? sizeof (Elf64_Dyn) : sizeof (Elf32_Dyn); | |
6635 | unsigned char buf[sizeof (Elf64_Dyn)]; /* The larger of the two. */ | |
367ba2c2 | 6636 | CORE_ADDR map = -1; |
2268b414 JK |
6637 | |
6638 | dynamic_memaddr = get_dynamic (pid, is_elf64); | |
6639 | if (dynamic_memaddr == 0) | |
367ba2c2 | 6640 | return map; |
2268b414 JK |
6641 | |
6642 | while (linux_read_memory (dynamic_memaddr, buf, dyn_size) == 0) | |
6643 | { | |
6644 | if (is_elf64) | |
6645 | { | |
6646 | Elf64_Dyn *const dyn = (Elf64_Dyn *) buf; | |
a738da3a | 6647 | #if defined DT_MIPS_RLD_MAP || defined DT_MIPS_RLD_MAP_REL |
367ba2c2 MR |
6648 | union |
6649 | { | |
6650 | Elf64_Xword map; | |
6651 | unsigned char buf[sizeof (Elf64_Xword)]; | |
6652 | } | |
6653 | rld_map; | |
a738da3a MF |
6654 | #endif |
6655 | #ifdef DT_MIPS_RLD_MAP | |
367ba2c2 MR |
6656 | if (dyn->d_tag == DT_MIPS_RLD_MAP) |
6657 | { | |
6658 | if (linux_read_memory (dyn->d_un.d_val, | |
6659 | rld_map.buf, sizeof (rld_map.buf)) == 0) | |
6660 | return rld_map.map; | |
6661 | else | |
6662 | break; | |
6663 | } | |
75f62ce7 | 6664 | #endif /* DT_MIPS_RLD_MAP */ |
a738da3a MF |
6665 | #ifdef DT_MIPS_RLD_MAP_REL |
6666 | if (dyn->d_tag == DT_MIPS_RLD_MAP_REL) | |
6667 | { | |
6668 | if (linux_read_memory (dyn->d_un.d_val + dynamic_memaddr, | |
6669 | rld_map.buf, sizeof (rld_map.buf)) == 0) | |
6670 | return rld_map.map; | |
6671 | else | |
6672 | break; | |
6673 | } | |
6674 | #endif /* DT_MIPS_RLD_MAP_REL */ | |
2268b414 | 6675 | |
367ba2c2 MR |
6676 | if (dyn->d_tag == DT_DEBUG && map == -1) |
6677 | map = dyn->d_un.d_val; | |
2268b414 JK |
6678 | |
6679 | if (dyn->d_tag == DT_NULL) | |
6680 | break; | |
6681 | } | |
6682 | else | |
6683 | { | |
6684 | Elf32_Dyn *const dyn = (Elf32_Dyn *) buf; | |
a738da3a | 6685 | #if defined DT_MIPS_RLD_MAP || defined DT_MIPS_RLD_MAP_REL |
367ba2c2 MR |
6686 | union |
6687 | { | |
6688 | Elf32_Word map; | |
6689 | unsigned char buf[sizeof (Elf32_Word)]; | |
6690 | } | |
6691 | rld_map; | |
a738da3a MF |
6692 | #endif |
6693 | #ifdef DT_MIPS_RLD_MAP | |
367ba2c2 MR |
6694 | if (dyn->d_tag == DT_MIPS_RLD_MAP) |
6695 | { | |
6696 | if (linux_read_memory (dyn->d_un.d_val, | |
6697 | rld_map.buf, sizeof (rld_map.buf)) == 0) | |
6698 | return rld_map.map; | |
6699 | else | |
6700 | break; | |
6701 | } | |
75f62ce7 | 6702 | #endif /* DT_MIPS_RLD_MAP */ |
a738da3a MF |
6703 | #ifdef DT_MIPS_RLD_MAP_REL |
6704 | if (dyn->d_tag == DT_MIPS_RLD_MAP_REL) | |
6705 | { | |
6706 | if (linux_read_memory (dyn->d_un.d_val + dynamic_memaddr, | |
6707 | rld_map.buf, sizeof (rld_map.buf)) == 0) | |
6708 | return rld_map.map; | |
6709 | else | |
6710 | break; | |
6711 | } | |
6712 | #endif /* DT_MIPS_RLD_MAP_REL */ | |
2268b414 | 6713 | |
367ba2c2 MR |
6714 | if (dyn->d_tag == DT_DEBUG && map == -1) |
6715 | map = dyn->d_un.d_val; | |
2268b414 JK |
6716 | |
6717 | if (dyn->d_tag == DT_NULL) | |
6718 | break; | |
6719 | } | |
6720 | ||
6721 | dynamic_memaddr += dyn_size; | |
6722 | } | |
6723 | ||
367ba2c2 | 6724 | return map; |
2268b414 JK |
6725 | } |
6726 | ||
6727 | /* Read one pointer from MEMADDR in the inferior. */ | |
6728 | ||
6729 | static int | |
6730 | read_one_ptr (CORE_ADDR memaddr, CORE_ADDR *ptr, int ptr_size) | |
6731 | { | |
485f1ee4 PA |
6732 | int ret; |
6733 | ||
6734 | /* Go through a union so this works on either big or little endian | |
6735 | hosts, when the inferior's pointer size is smaller than the size | |
6736 | of CORE_ADDR. It is assumed the inferior's endianness is the | |
6737 | same of the superior's. */ | |
6738 | union | |
6739 | { | |
6740 | CORE_ADDR core_addr; | |
6741 | unsigned int ui; | |
6742 | unsigned char uc; | |
6743 | } addr; | |
6744 | ||
6745 | ret = linux_read_memory (memaddr, &addr.uc, ptr_size); | |
6746 | if (ret == 0) | |
6747 | { | |
6748 | if (ptr_size == sizeof (CORE_ADDR)) | |
6749 | *ptr = addr.core_addr; | |
6750 | else if (ptr_size == sizeof (unsigned int)) | |
6751 | *ptr = addr.ui; | |
6752 | else | |
6753 | gdb_assert_not_reached ("unhandled pointer size"); | |
6754 | } | |
6755 | return ret; | |
2268b414 JK |
6756 | } |
6757 | ||
974387bb TBA |
6758 | bool |
6759 | linux_process_target::supports_qxfer_libraries_svr4 () | |
6760 | { | |
6761 | return true; | |
6762 | } | |
6763 | ||
2268b414 JK |
6764 | struct link_map_offsets |
6765 | { | |
6766 | /* Offset and size of r_debug.r_version. */ | |
6767 | int r_version_offset; | |
6768 | ||
6769 | /* Offset and size of r_debug.r_map. */ | |
6770 | int r_map_offset; | |
6771 | ||
6772 | /* Offset to l_addr field in struct link_map. */ | |
6773 | int l_addr_offset; | |
6774 | ||
6775 | /* Offset to l_name field in struct link_map. */ | |
6776 | int l_name_offset; | |
6777 | ||
6778 | /* Offset to l_ld field in struct link_map. */ | |
6779 | int l_ld_offset; | |
6780 | ||
6781 | /* Offset to l_next field in struct link_map. */ | |
6782 | int l_next_offset; | |
6783 | ||
6784 | /* Offset to l_prev field in struct link_map. */ | |
6785 | int l_prev_offset; | |
6786 | }; | |
6787 | ||
fb723180 | 6788 | /* Construct qXfer:libraries-svr4:read reply. */ |
2268b414 | 6789 | |
974387bb TBA |
6790 | int |
6791 | linux_process_target::qxfer_libraries_svr4 (const char *annex, | |
6792 | unsigned char *readbuf, | |
6793 | unsigned const char *writebuf, | |
6794 | CORE_ADDR offset, int len) | |
2268b414 | 6795 | { |
fe978cb0 | 6796 | struct process_info_private *const priv = current_process ()->priv; |
2268b414 JK |
6797 | char filename[PATH_MAX]; |
6798 | int pid, is_elf64; | |
6799 | ||
6800 | static const struct link_map_offsets lmo_32bit_offsets = | |
6801 | { | |
6802 | 0, /* r_version offset. */ | |
6803 | 4, /* r_debug.r_map offset. */ | |
6804 | 0, /* l_addr offset in link_map. */ | |
6805 | 4, /* l_name offset in link_map. */ | |
6806 | 8, /* l_ld offset in link_map. */ | |
6807 | 12, /* l_next offset in link_map. */ | |
6808 | 16 /* l_prev offset in link_map. */ | |
6809 | }; | |
6810 | ||
6811 | static const struct link_map_offsets lmo_64bit_offsets = | |
6812 | { | |
6813 | 0, /* r_version offset. */ | |
6814 | 8, /* r_debug.r_map offset. */ | |
6815 | 0, /* l_addr offset in link_map. */ | |
6816 | 8, /* l_name offset in link_map. */ | |
6817 | 16, /* l_ld offset in link_map. */ | |
6818 | 24, /* l_next offset in link_map. */ | |
6819 | 32 /* l_prev offset in link_map. */ | |
6820 | }; | |
6821 | const struct link_map_offsets *lmo; | |
214d508e | 6822 | unsigned int machine; |
b1fbec62 GB |
6823 | int ptr_size; |
6824 | CORE_ADDR lm_addr = 0, lm_prev = 0; | |
b1fbec62 GB |
6825 | CORE_ADDR l_name, l_addr, l_ld, l_next, l_prev; |
6826 | int header_done = 0; | |
2268b414 JK |
6827 | |
6828 | if (writebuf != NULL) | |
6829 | return -2; | |
6830 | if (readbuf == NULL) | |
6831 | return -1; | |
6832 | ||
0bfdf32f | 6833 | pid = lwpid_of (current_thread); |
2268b414 | 6834 | xsnprintf (filename, sizeof filename, "/proc/%d/exe", pid); |
214d508e | 6835 | is_elf64 = elf_64_file_p (filename, &machine); |
2268b414 | 6836 | lmo = is_elf64 ? &lmo_64bit_offsets : &lmo_32bit_offsets; |
b1fbec62 | 6837 | ptr_size = is_elf64 ? 8 : 4; |
2268b414 | 6838 | |
b1fbec62 GB |
6839 | while (annex[0] != '\0') |
6840 | { | |
6841 | const char *sep; | |
6842 | CORE_ADDR *addrp; | |
da4ae14a | 6843 | int name_len; |
2268b414 | 6844 | |
b1fbec62 GB |
6845 | sep = strchr (annex, '='); |
6846 | if (sep == NULL) | |
6847 | break; | |
0c5bf5a9 | 6848 | |
da4ae14a TT |
6849 | name_len = sep - annex; |
6850 | if (name_len == 5 && startswith (annex, "start")) | |
b1fbec62 | 6851 | addrp = &lm_addr; |
da4ae14a | 6852 | else if (name_len == 4 && startswith (annex, "prev")) |
b1fbec62 GB |
6853 | addrp = &lm_prev; |
6854 | else | |
6855 | { | |
6856 | annex = strchr (sep, ';'); | |
6857 | if (annex == NULL) | |
6858 | break; | |
6859 | annex++; | |
6860 | continue; | |
6861 | } | |
6862 | ||
6863 | annex = decode_address_to_semicolon (addrp, sep + 1); | |
2268b414 | 6864 | } |
b1fbec62 GB |
6865 | |
6866 | if (lm_addr == 0) | |
2268b414 | 6867 | { |
b1fbec62 GB |
6868 | int r_version = 0; |
6869 | ||
6870 | if (priv->r_debug == 0) | |
6871 | priv->r_debug = get_r_debug (pid, is_elf64); | |
6872 | ||
6873 | /* We failed to find DT_DEBUG. Such situation will not change | |
6874 | for this inferior - do not retry it. Report it to GDB as | |
6875 | E01, see for the reasons at the GDB solib-svr4.c side. */ | |
6876 | if (priv->r_debug == (CORE_ADDR) -1) | |
6877 | return -1; | |
6878 | ||
6879 | if (priv->r_debug != 0) | |
2268b414 | 6880 | { |
b1fbec62 GB |
6881 | if (linux_read_memory (priv->r_debug + lmo->r_version_offset, |
6882 | (unsigned char *) &r_version, | |
6883 | sizeof (r_version)) != 0 | |
6884 | || r_version != 1) | |
6885 | { | |
6886 | warning ("unexpected r_debug version %d", r_version); | |
6887 | } | |
6888 | else if (read_one_ptr (priv->r_debug + lmo->r_map_offset, | |
6889 | &lm_addr, ptr_size) != 0) | |
6890 | { | |
6891 | warning ("unable to read r_map from 0x%lx", | |
6892 | (long) priv->r_debug + lmo->r_map_offset); | |
6893 | } | |
2268b414 | 6894 | } |
b1fbec62 | 6895 | } |
2268b414 | 6896 | |
f6e8a41e | 6897 | std::string document = "<library-list-svr4 version=\"1.0\""; |
b1fbec62 GB |
6898 | |
6899 | while (lm_addr | |
6900 | && read_one_ptr (lm_addr + lmo->l_name_offset, | |
6901 | &l_name, ptr_size) == 0 | |
6902 | && read_one_ptr (lm_addr + lmo->l_addr_offset, | |
6903 | &l_addr, ptr_size) == 0 | |
6904 | && read_one_ptr (lm_addr + lmo->l_ld_offset, | |
6905 | &l_ld, ptr_size) == 0 | |
6906 | && read_one_ptr (lm_addr + lmo->l_prev_offset, | |
6907 | &l_prev, ptr_size) == 0 | |
6908 | && read_one_ptr (lm_addr + lmo->l_next_offset, | |
6909 | &l_next, ptr_size) == 0) | |
6910 | { | |
6911 | unsigned char libname[PATH_MAX]; | |
6912 | ||
6913 | if (lm_prev != l_prev) | |
2268b414 | 6914 | { |
b1fbec62 GB |
6915 | warning ("Corrupted shared library list: 0x%lx != 0x%lx", |
6916 | (long) lm_prev, (long) l_prev); | |
6917 | break; | |
2268b414 JK |
6918 | } |
6919 | ||
d878444c JK |
6920 | /* Ignore the first entry even if it has valid name as the first entry |
6921 | corresponds to the main executable. The first entry should not be | |
6922 | skipped if the dynamic loader was loaded late by a static executable | |
6923 | (see solib-svr4.c parameter ignore_first). But in such case the main | |
6924 | executable does not have PT_DYNAMIC present and this function already | |
6925 | exited above due to failed get_r_debug. */ | |
6926 | if (lm_prev == 0) | |
f6e8a41e | 6927 | string_appendf (document, " main-lm=\"0x%lx\"", (unsigned long) lm_addr); |
d878444c JK |
6928 | else |
6929 | { | |
6930 | /* Not checking for error because reading may stop before | |
6931 | we've got PATH_MAX worth of characters. */ | |
6932 | libname[0] = '\0'; | |
6933 | linux_read_memory (l_name, libname, sizeof (libname) - 1); | |
6934 | libname[sizeof (libname) - 1] = '\0'; | |
6935 | if (libname[0] != '\0') | |
2268b414 | 6936 | { |
d878444c JK |
6937 | if (!header_done) |
6938 | { | |
6939 | /* Terminate `<library-list-svr4'. */ | |
f6e8a41e | 6940 | document += '>'; |
d878444c JK |
6941 | header_done = 1; |
6942 | } | |
2268b414 | 6943 | |
e6a58aa8 SM |
6944 | string_appendf (document, "<library name=\""); |
6945 | xml_escape_text_append (&document, (char *) libname); | |
6946 | string_appendf (document, "\" lm=\"0x%lx\" " | |
f6e8a41e | 6947 | "l_addr=\"0x%lx\" l_ld=\"0x%lx\"/>", |
e6a58aa8 SM |
6948 | (unsigned long) lm_addr, (unsigned long) l_addr, |
6949 | (unsigned long) l_ld); | |
d878444c | 6950 | } |
0afae3cf | 6951 | } |
b1fbec62 GB |
6952 | |
6953 | lm_prev = lm_addr; | |
6954 | lm_addr = l_next; | |
2268b414 JK |
6955 | } |
6956 | ||
b1fbec62 GB |
6957 | if (!header_done) |
6958 | { | |
6959 | /* Empty list; terminate `<library-list-svr4'. */ | |
f6e8a41e | 6960 | document += "/>"; |
b1fbec62 GB |
6961 | } |
6962 | else | |
f6e8a41e | 6963 | document += "</library-list-svr4>"; |
b1fbec62 | 6964 | |
f6e8a41e | 6965 | int document_len = document.length (); |
2268b414 JK |
6966 | if (offset < document_len) |
6967 | document_len -= offset; | |
6968 | else | |
6969 | document_len = 0; | |
6970 | if (len > document_len) | |
6971 | len = document_len; | |
6972 | ||
f6e8a41e | 6973 | memcpy (readbuf, document.data () + offset, len); |
2268b414 JK |
6974 | |
6975 | return len; | |
6976 | } | |
6977 | ||
9accd112 MM |
6978 | #ifdef HAVE_LINUX_BTRACE |
6979 | ||
79597bdd TBA |
6980 | btrace_target_info * |
6981 | linux_process_target::enable_btrace (ptid_t ptid, | |
6982 | const btrace_config *conf) | |
6983 | { | |
6984 | return linux_enable_btrace (ptid, conf); | |
6985 | } | |
6986 | ||
969c39fb | 6987 | /* See to_disable_btrace target method. */ |
9accd112 | 6988 | |
79597bdd TBA |
6989 | int |
6990 | linux_process_target::disable_btrace (btrace_target_info *tinfo) | |
969c39fb MM |
6991 | { |
6992 | enum btrace_error err; | |
6993 | ||
6994 | err = linux_disable_btrace (tinfo); | |
6995 | return (err == BTRACE_ERR_NONE ? 0 : -1); | |
6996 | } | |
6997 | ||
bc504a31 | 6998 | /* Encode an Intel Processor Trace configuration. */ |
b20a6524 MM |
6999 | |
7000 | static void | |
7001 | linux_low_encode_pt_config (struct buffer *buffer, | |
7002 | const struct btrace_data_pt_config *config) | |
7003 | { | |
7004 | buffer_grow_str (buffer, "<pt-config>\n"); | |
7005 | ||
7006 | switch (config->cpu.vendor) | |
7007 | { | |
7008 | case CV_INTEL: | |
7009 | buffer_xml_printf (buffer, "<cpu vendor=\"GenuineIntel\" family=\"%u\" " | |
7010 | "model=\"%u\" stepping=\"%u\"/>\n", | |
7011 | config->cpu.family, config->cpu.model, | |
7012 | config->cpu.stepping); | |
7013 | break; | |
7014 | ||
7015 | default: | |
7016 | break; | |
7017 | } | |
7018 | ||
7019 | buffer_grow_str (buffer, "</pt-config>\n"); | |
7020 | } | |
7021 | ||
7022 | /* Encode a raw buffer. */ | |
7023 | ||
7024 | static void | |
7025 | linux_low_encode_raw (struct buffer *buffer, const gdb_byte *data, | |
7026 | unsigned int size) | |
7027 | { | |
7028 | if (size == 0) | |
7029 | return; | |
7030 | ||
268a13a5 | 7031 | /* We use hex encoding - see gdbsupport/rsp-low.h. */ |
b20a6524 MM |
7032 | buffer_grow_str (buffer, "<raw>\n"); |
7033 | ||
7034 | while (size-- > 0) | |
7035 | { | |
7036 | char elem[2]; | |
7037 | ||
7038 | elem[0] = tohex ((*data >> 4) & 0xf); | |
7039 | elem[1] = tohex (*data++ & 0xf); | |
7040 | ||
7041 | buffer_grow (buffer, elem, 2); | |
7042 | } | |
7043 | ||
7044 | buffer_grow_str (buffer, "</raw>\n"); | |
7045 | } | |
7046 | ||
969c39fb MM |
7047 | /* See to_read_btrace target method. */ |
7048 | ||
79597bdd TBA |
7049 | int |
7050 | linux_process_target::read_btrace (btrace_target_info *tinfo, | |
7051 | buffer *buffer, | |
7052 | enum btrace_read_type type) | |
9accd112 | 7053 | { |
734b0e4b | 7054 | struct btrace_data btrace; |
969c39fb | 7055 | enum btrace_error err; |
9accd112 | 7056 | |
969c39fb MM |
7057 | err = linux_read_btrace (&btrace, tinfo, type); |
7058 | if (err != BTRACE_ERR_NONE) | |
7059 | { | |
7060 | if (err == BTRACE_ERR_OVERFLOW) | |
7061 | buffer_grow_str0 (buffer, "E.Overflow."); | |
7062 | else | |
7063 | buffer_grow_str0 (buffer, "E.Generic Error."); | |
7064 | ||
8dcc53b3 | 7065 | return -1; |
969c39fb | 7066 | } |
9accd112 | 7067 | |
734b0e4b MM |
7068 | switch (btrace.format) |
7069 | { | |
7070 | case BTRACE_FORMAT_NONE: | |
7071 | buffer_grow_str0 (buffer, "E.No Trace."); | |
8dcc53b3 | 7072 | return -1; |
734b0e4b MM |
7073 | |
7074 | case BTRACE_FORMAT_BTS: | |
7075 | buffer_grow_str (buffer, "<!DOCTYPE btrace SYSTEM \"btrace.dtd\">\n"); | |
7076 | buffer_grow_str (buffer, "<btrace version=\"1.0\">\n"); | |
9accd112 | 7077 | |
46f29a9a | 7078 | for (const btrace_block &block : *btrace.variant.bts.blocks) |
734b0e4b | 7079 | buffer_xml_printf (buffer, "<block begin=\"0x%s\" end=\"0x%s\"/>\n", |
46f29a9a | 7080 | paddress (block.begin), paddress (block.end)); |
9accd112 | 7081 | |
734b0e4b MM |
7082 | buffer_grow_str0 (buffer, "</btrace>\n"); |
7083 | break; | |
7084 | ||
b20a6524 MM |
7085 | case BTRACE_FORMAT_PT: |
7086 | buffer_grow_str (buffer, "<!DOCTYPE btrace SYSTEM \"btrace.dtd\">\n"); | |
7087 | buffer_grow_str (buffer, "<btrace version=\"1.0\">\n"); | |
7088 | buffer_grow_str (buffer, "<pt>\n"); | |
7089 | ||
7090 | linux_low_encode_pt_config (buffer, &btrace.variant.pt.config); | |
9accd112 | 7091 | |
b20a6524 MM |
7092 | linux_low_encode_raw (buffer, btrace.variant.pt.data, |
7093 | btrace.variant.pt.size); | |
7094 | ||
7095 | buffer_grow_str (buffer, "</pt>\n"); | |
7096 | buffer_grow_str0 (buffer, "</btrace>\n"); | |
7097 | break; | |
7098 | ||
7099 | default: | |
7100 | buffer_grow_str0 (buffer, "E.Unsupported Trace Format."); | |
8dcc53b3 | 7101 | return -1; |
734b0e4b | 7102 | } |
969c39fb MM |
7103 | |
7104 | return 0; | |
9accd112 | 7105 | } |
f4abbc16 MM |
7106 | |
7107 | /* See to_btrace_conf target method. */ | |
7108 | ||
79597bdd TBA |
7109 | int |
7110 | linux_process_target::read_btrace_conf (const btrace_target_info *tinfo, | |
7111 | buffer *buffer) | |
f4abbc16 MM |
7112 | { |
7113 | const struct btrace_config *conf; | |
7114 | ||
7115 | buffer_grow_str (buffer, "<!DOCTYPE btrace-conf SYSTEM \"btrace-conf.dtd\">\n"); | |
7116 | buffer_grow_str (buffer, "<btrace-conf version=\"1.0\">\n"); | |
7117 | ||
7118 | conf = linux_btrace_conf (tinfo); | |
7119 | if (conf != NULL) | |
7120 | { | |
7121 | switch (conf->format) | |
7122 | { | |
7123 | case BTRACE_FORMAT_NONE: | |
7124 | break; | |
7125 | ||
7126 | case BTRACE_FORMAT_BTS: | |
d33501a5 MM |
7127 | buffer_xml_printf (buffer, "<bts"); |
7128 | buffer_xml_printf (buffer, " size=\"0x%x\"", conf->bts.size); | |
7129 | buffer_xml_printf (buffer, " />\n"); | |
f4abbc16 | 7130 | break; |
b20a6524 MM |
7131 | |
7132 | case BTRACE_FORMAT_PT: | |
7133 | buffer_xml_printf (buffer, "<pt"); | |
7134 | buffer_xml_printf (buffer, " size=\"0x%x\"", conf->pt.size); | |
7135 | buffer_xml_printf (buffer, "/>\n"); | |
7136 | break; | |
f4abbc16 MM |
7137 | } |
7138 | } | |
7139 | ||
7140 | buffer_grow_str0 (buffer, "</btrace-conf>\n"); | |
7141 | return 0; | |
7142 | } | |
9accd112 MM |
7143 | #endif /* HAVE_LINUX_BTRACE */ |
7144 | ||
7b669087 GB |
7145 | /* See nat/linux-nat.h. */ |
7146 | ||
7147 | ptid_t | |
7148 | current_lwp_ptid (void) | |
7149 | { | |
7150 | return ptid_of (current_thread); | |
7151 | } | |
7152 | ||
7f63b89b TBA |
7153 | const char * |
7154 | linux_process_target::thread_name (ptid_t thread) | |
7155 | { | |
7156 | return linux_proc_tid_get_name (thread); | |
7157 | } | |
7158 | ||
7159 | #if USE_THREAD_DB | |
7160 | bool | |
7161 | linux_process_target::thread_handle (ptid_t ptid, gdb_byte **handle, | |
7162 | int *handle_len) | |
7163 | { | |
7164 | return thread_db_thread_handle (ptid, handle, handle_len); | |
7165 | } | |
7166 | #endif | |
7167 | ||
276d4552 YQ |
7168 | /* Default implementation of linux_target_ops method "set_pc" for |
7169 | 32-bit pc register which is literally named "pc". */ | |
7170 | ||
7171 | void | |
7172 | linux_set_pc_32bit (struct regcache *regcache, CORE_ADDR pc) | |
7173 | { | |
7174 | uint32_t newpc = pc; | |
7175 | ||
7176 | supply_register_by_name (regcache, "pc", &newpc); | |
7177 | } | |
7178 | ||
7179 | /* Default implementation of linux_target_ops method "get_pc" for | |
7180 | 32-bit pc register which is literally named "pc". */ | |
7181 | ||
7182 | CORE_ADDR | |
7183 | linux_get_pc_32bit (struct regcache *regcache) | |
7184 | { | |
7185 | uint32_t pc; | |
7186 | ||
7187 | collect_register_by_name (regcache, "pc", &pc); | |
7188 | if (debug_threads) | |
7189 | debug_printf ("stop pc is 0x%" PRIx32 "\n", pc); | |
7190 | return pc; | |
7191 | } | |
7192 | ||
6f69e520 YQ |
7193 | /* Default implementation of linux_target_ops method "set_pc" for |
7194 | 64-bit pc register which is literally named "pc". */ | |
7195 | ||
7196 | void | |
7197 | linux_set_pc_64bit (struct regcache *regcache, CORE_ADDR pc) | |
7198 | { | |
7199 | uint64_t newpc = pc; | |
7200 | ||
7201 | supply_register_by_name (regcache, "pc", &newpc); | |
7202 | } | |
7203 | ||
7204 | /* Default implementation of linux_target_ops method "get_pc" for | |
7205 | 64-bit pc register which is literally named "pc". */ | |
7206 | ||
7207 | CORE_ADDR | |
7208 | linux_get_pc_64bit (struct regcache *regcache) | |
7209 | { | |
7210 | uint64_t pc; | |
7211 | ||
7212 | collect_register_by_name (regcache, "pc", &pc); | |
7213 | if (debug_threads) | |
7214 | debug_printf ("stop pc is 0x%" PRIx64 "\n", pc); | |
7215 | return pc; | |
7216 | } | |
7217 | ||
0570503d | 7218 | /* See linux-low.h. */ |
974c89e0 | 7219 | |
0570503d PFC |
7220 | int |
7221 | linux_get_auxv (int wordsize, CORE_ADDR match, CORE_ADDR *valp) | |
974c89e0 AH |
7222 | { |
7223 | gdb_byte *data = (gdb_byte *) alloca (2 * wordsize); | |
7224 | int offset = 0; | |
7225 | ||
7226 | gdb_assert (wordsize == 4 || wordsize == 8); | |
7227 | ||
52405d85 | 7228 | while (the_target->read_auxv (offset, data, 2 * wordsize) == 2 * wordsize) |
974c89e0 AH |
7229 | { |
7230 | if (wordsize == 4) | |
7231 | { | |
0570503d | 7232 | uint32_t *data_p = (uint32_t *) data; |
974c89e0 | 7233 | if (data_p[0] == match) |
0570503d PFC |
7234 | { |
7235 | *valp = data_p[1]; | |
7236 | return 1; | |
7237 | } | |
974c89e0 AH |
7238 | } |
7239 | else | |
7240 | { | |
0570503d | 7241 | uint64_t *data_p = (uint64_t *) data; |
974c89e0 | 7242 | if (data_p[0] == match) |
0570503d PFC |
7243 | { |
7244 | *valp = data_p[1]; | |
7245 | return 1; | |
7246 | } | |
974c89e0 AH |
7247 | } |
7248 | ||
7249 | offset += 2 * wordsize; | |
7250 | } | |
7251 | ||
7252 | return 0; | |
7253 | } | |
7254 | ||
7255 | /* See linux-low.h. */ | |
7256 | ||
7257 | CORE_ADDR | |
7258 | linux_get_hwcap (int wordsize) | |
7259 | { | |
0570503d PFC |
7260 | CORE_ADDR hwcap = 0; |
7261 | linux_get_auxv (wordsize, AT_HWCAP, &hwcap); | |
7262 | return hwcap; | |
974c89e0 AH |
7263 | } |
7264 | ||
7265 | /* See linux-low.h. */ | |
7266 | ||
7267 | CORE_ADDR | |
7268 | linux_get_hwcap2 (int wordsize) | |
7269 | { | |
0570503d PFC |
7270 | CORE_ADDR hwcap2 = 0; |
7271 | linux_get_auxv (wordsize, AT_HWCAP2, &hwcap2); | |
7272 | return hwcap2; | |
974c89e0 | 7273 | } |
6f69e520 | 7274 | |
3aee8918 PA |
7275 | #ifdef HAVE_LINUX_REGSETS |
7276 | void | |
7277 | initialize_regsets_info (struct regsets_info *info) | |
7278 | { | |
7279 | for (info->num_regsets = 0; | |
7280 | info->regsets[info->num_regsets].size >= 0; | |
7281 | info->num_regsets++) | |
7282 | ; | |
3aee8918 PA |
7283 | } |
7284 | #endif | |
7285 | ||
da6d8c04 DJ |
7286 | void |
7287 | initialize_low (void) | |
7288 | { | |
bd99dc85 | 7289 | struct sigaction sigchld_action; |
dd373349 | 7290 | |
bd99dc85 | 7291 | memset (&sigchld_action, 0, sizeof (sigchld_action)); |
ef0478f6 | 7292 | set_target_ops (the_linux_target); |
dd373349 | 7293 | |
aa7c7447 | 7294 | linux_ptrace_init_warnings (); |
1b919490 | 7295 | linux_proc_init_warnings (); |
bd99dc85 PA |
7296 | |
7297 | sigchld_action.sa_handler = sigchld_handler; | |
7298 | sigemptyset (&sigchld_action.sa_mask); | |
7299 | sigchld_action.sa_flags = SA_RESTART; | |
7300 | sigaction (SIGCHLD, &sigchld_action, NULL); | |
3aee8918 PA |
7301 | |
7302 | initialize_low_arch (); | |
89245bc0 DB |
7303 | |
7304 | linux_check_ptrace_features (); | |
da6d8c04 | 7305 | } |